Initial import

26 files changed, 11822 insertions, 0 deletions

diff --git a/drivers/misc/mei/Kconfig b/drivers/misc/mei/Kconfig
new file mode 100644
index 000000000..d23384dde
--- /dev/null
+++ b/drivers/misc/mei/Kconfig
@@ -0,0 +1,45 @@
+config INTEL_MEI
+	tristate "Intel Management Engine Interface"
+	depends on X86 && PCI && WATCHDOG_CORE
+	help
+	  The Intel Management Engine (Intel ME) provides Manageability,
+	  Security and Media services for system containing Intel chipsets.
+	  if selected /dev/mei misc device will be created.
+
+	  For more information see
+	  <http://software.intel.com/en-us/manageability/>
+
+config INTEL_MEI_ME
+	tristate "ME Enabled Intel Chipsets"
+	select INTEL_MEI
+	depends on X86 && PCI && WATCHDOG_CORE
+	help
+	  MEI support for ME Enabled Intel chipsets.
+
+	  Supported Chipsets are:
+	  7 Series Chipset Family
+	  6 Series Chipset Family
+	  5 Series Chipset Family
+	  4 Series Chipset Family
+	  Mobile 4 Series Chipset Family
+	  ICH9
+	  82946GZ/GL
+	  82G35 Express
+	  82Q963/Q965
+	  82P965/G965
+	  Mobile PM965/GM965
+	  Mobile GME965/GLE960
+	  82Q35 Express
+	  82G33/G31/P35/P31 Express
+	  82Q33 Express
+	  82X38/X48 Express
+
+config INTEL_MEI_TXE
+	tristate "Intel Trusted Execution Environment with ME Interface"
+	select INTEL_MEI
+	depends on X86 && PCI && WATCHDOG_CORE
+	help
+	  MEI Support for Trusted Execution Environment device on Intel SoCs
+
+	  Supported SoCs:
+	  Intel Bay Trail
diff --git a/drivers/misc/mei/Makefile b/drivers/misc/mei/Makefile
new file mode 100644
index 000000000..518914a82
--- /dev/null
+++ b/drivers/misc/mei/Makefile
@@ -0,0 +1,26 @@
+#
+# Makefile - Intel Management Engine Interface (Intel MEI) Linux driver
+# Copyright (c) 2010-2014, Intel Corporation.
+#
+obj-$(CONFIG_INTEL_MEI) += mei.o
+mei-objs := init.o
+mei-objs += hbm.o
+mei-objs += interrupt.o
+mei-objs += client.o
+mei-objs += main.o
+mei-objs += amthif.o
+mei-objs += wd.o
+mei-objs += bus.o
+mei-objs += nfc.o
+mei-$(CONFIG_DEBUG_FS) += debugfs.o
+
+obj-$(CONFIG_INTEL_MEI_ME) += mei-me.o
+mei-me-objs := pci-me.o
+mei-me-objs += hw-me.o
+
+obj-$(CONFIG_INTEL_MEI_TXE) += mei-txe.o
+mei-txe-objs := pci-txe.o
+mei-txe-objs += hw-txe.o
+
+mei-$(CONFIG_EVENT_TRACING) += mei-trace.o
+CFLAGS_mei-trace.o = -I$(src)
diff --git a/drivers/misc/mei/amthif.c b/drivers/misc/mei/amthif.c
new file mode 100644
index 000000000..d2cd53e3f
--- /dev/null
+++ b/drivers/misc/mei/amthif.c
@@ -0,0 +1,606 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2003-2012, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/ioctl.h>
+#include <linux/cdev.h>
+#include <linux/list.h>
+#include <linux/delay.h>
+#include <linux/sched.h>
+#include <linux/uuid.h>
+#include <linux/jiffies.h>
+#include <linux/uaccess.h>
+#include <linux/slab.h>
+
+#include <linux/mei.h>
+
+#include "mei_dev.h"
+#include "hbm.h"
+#include "client.h"
+
+const uuid_le mei_amthif_guid  = UUID_LE(0x12f80028, 0xb4b7, 0x4b2d,
+					 0xac, 0xa8, 0x46, 0xe0,
+					 0xff, 0x65, 0x81, 0x4c);
+
+/**
+ * mei_amthif_reset_params - initializes mei device iamthif
+ *
+ * @dev: the device structure
+ */
+void mei_amthif_reset_params(struct mei_device *dev)
+{
+	/* reset iamthif parameters. */
+	dev->iamthif_current_cb = NULL;
+	dev->iamthif_canceled = false;
+	dev->iamthif_state = MEI_IAMTHIF_IDLE;
+	dev->iamthif_timer = 0;
+	dev->iamthif_stall_timer = 0;
+	dev->iamthif_open_count = 0;
+}
+
+/**
+ * mei_amthif_host_init - mei initialization amthif client.
+ *
+ * @dev: the device structure
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+int mei_amthif_host_init(struct mei_device *dev)
+{
+	struct mei_cl *cl = &dev->iamthif_cl;
+	struct mei_me_client *me_cl;
+	int ret;
+
+	dev->iamthif_state = MEI_IAMTHIF_IDLE;
+
+	mei_cl_init(cl, dev);
+
+	me_cl = mei_me_cl_by_uuid(dev, &mei_amthif_guid);
+	if (!me_cl) {
+		dev_info(dev->dev, "amthif: failed to find the client");
+		return -ENOTTY;
+	}
+
+	cl->me_client_id = me_cl->client_id;
+	cl->cl_uuid = me_cl->props.protocol_name;
+
+	/* Assign iamthif_mtu to the value received from ME  */
+
+	dev->iamthif_mtu = me_cl->props.max_msg_length;
+	dev_dbg(dev->dev, "IAMTHIF_MTU = %d\n", dev->iamthif_mtu);
+
+
+	ret = mei_cl_link(cl, MEI_IAMTHIF_HOST_CLIENT_ID);
+	if (ret < 0) {
+		dev_err(dev->dev, "amthif: failed cl_link %d\n", ret);
+		goto out;
+	}
+
+	ret = mei_cl_connect(cl, NULL);
+
+	dev->iamthif_state = MEI_IAMTHIF_IDLE;
+
+out:
+	mei_me_cl_put(me_cl);
+	return ret;
+}
+
+/**
+ * mei_amthif_find_read_list_entry - finds a amthilist entry for current file
+ *
+ * @dev: the device structure
+ * @file: pointer to file object
+ *
+ * Return:   returned a list entry on success, NULL on failure.
+ */
+struct mei_cl_cb *mei_amthif_find_read_list_entry(struct mei_device *dev,
+						struct file *file)
+{
+	struct mei_cl_cb *cb;
+
+	list_for_each_entry(cb, &dev->amthif_rd_complete_list.list, list)
+		if (cb->file_object == file)
+			return cb;
+	return NULL;
+}
+
+
+/**
+ * mei_amthif_read - read data from AMTHIF client
+ *
+ * @dev: the device structure
+ * @file: pointer to file object
+ * @ubuf: pointer to user data in user space
+ * @length: data length to read
+ * @offset: data read offset
+ *
+ * Locking: called under "dev->device_lock" lock
+ *
+ * Return:
+ *  returned data length on success,
+ *  zero if no data to read,
+ *  negative on failure.
+ */
+int mei_amthif_read(struct mei_device *dev, struct file *file,
+	       char __user *ubuf, size_t length, loff_t *offset)
+{
+	struct mei_cl *cl = file->private_data;
+	struct mei_cl_cb *cb;
+	unsigned long timeout;
+	int rets;
+	int wait_ret;
+
+	/* Only possible if we are in timeout */
+	if (!cl) {
+		dev_err(dev->dev, "bad file ext.\n");
+		return -ETIME;
+	}
+
+	dev_dbg(dev->dev, "checking amthif data\n");
+	cb = mei_amthif_find_read_list_entry(dev, file);
+
+	/* Check for if we can block or not*/
+	if (cb == NULL && file->f_flags & O_NONBLOCK)
+		return -EAGAIN;
+
+
+	dev_dbg(dev->dev, "waiting for amthif data\n");
+	while (cb == NULL) {
+		/* unlock the Mutex */
+		mutex_unlock(&dev->device_lock);
+
+		wait_ret = wait_event_interruptible(dev->iamthif_cl.wait,
+			(cb = mei_amthif_find_read_list_entry(dev, file)));
+
+		/* Locking again the Mutex */
+		mutex_lock(&dev->device_lock);
+
+		if (wait_ret)
+			return -ERESTARTSYS;
+
+		dev_dbg(dev->dev, "woke up from sleep\n");
+	}
+
+	if (cb->status) {
+		rets = cb->status;
+		dev_dbg(dev->dev, "read operation failed %d\n", rets);
+		goto free;
+	}
+
+	dev_dbg(dev->dev, "Got amthif data\n");
+	dev->iamthif_timer = 0;
+
+	timeout = cb->read_time +
+		mei_secs_to_jiffies(MEI_IAMTHIF_READ_TIMER);
+	dev_dbg(dev->dev, "amthif timeout = %lud\n",
+			timeout);
+
+	if  (time_after(jiffies, timeout)) {
+		dev_dbg(dev->dev, "amthif Time out\n");
+		/* 15 sec for the message has expired */
+		list_del_init(&cb->list);
+		rets = -ETIME;
+		goto free;
+	}
+	/* if the whole message will fit remove it from the list */
+	if (cb->buf_idx >= *offset && length >= (cb->buf_idx - *offset))
+		list_del_init(&cb->list);
+	else if (cb->buf_idx > 0 && cb->buf_idx <= *offset) {
+		/* end of the message has been reached */
+		list_del_init(&cb->list);
+		rets = 0;
+		goto free;
+	}
+		/* else means that not full buffer will be read and do not
+		 * remove message from deletion list
+		 */
+
+	dev_dbg(dev->dev, "amthif cb->buf size - %d\n",
+	    cb->buf.size);
+	dev_dbg(dev->dev, "amthif cb->buf_idx - %lu\n", cb->buf_idx);
+
+	/* length is being truncated to PAGE_SIZE, however,
+	 * the buf_idx may point beyond */
+	length = min_t(size_t, length, (cb->buf_idx - *offset));
+
+	if (copy_to_user(ubuf, cb->buf.data + *offset, length)) {
+		dev_dbg(dev->dev, "failed to copy data to userland\n");
+		rets = -EFAULT;
+	} else {
+		rets = length;
+		if ((*offset + length) < cb->buf_idx) {
+			*offset += length;
+			goto out;
+		}
+	}
+free:
+	dev_dbg(dev->dev, "free amthif cb memory.\n");
+	*offset = 0;
+	mei_io_cb_free(cb);
+out:
+	return rets;
+}
+
+/**
+ * mei_amthif_read_start - queue message for sending read credential
+ *
+ * @cl: host client
+ * @file: file pointer of message recipient
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+static int mei_amthif_read_start(struct mei_cl *cl, struct file *file)
+{
+	struct mei_device *dev = cl->dev;
+	struct mei_cl_cb *cb;
+	size_t length = dev->iamthif_mtu;
+	int rets;
+
+	cb = mei_io_cb_init(cl, MEI_FOP_READ, file);
+	if (!cb) {
+		rets = -ENOMEM;
+		goto err;
+	}
+
+	rets = mei_io_cb_alloc_buf(cb, length);
+	if (rets)
+		goto err;
+
+	list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
+
+	dev->iamthif_state = MEI_IAMTHIF_READING;
+	dev->iamthif_file_object = cb->file_object;
+	dev->iamthif_current_cb = cb;
+
+	return 0;
+err:
+	mei_io_cb_free(cb);
+	return rets;
+}
+
+/**
+ * mei_amthif_send_cmd - send amthif command to the ME
+ *
+ * @cl: the host client
+ * @cb: mei call back struct
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+static int mei_amthif_send_cmd(struct mei_cl *cl, struct mei_cl_cb *cb)
+{
+	struct mei_device *dev;
+	int ret;
+
+	if (!cl->dev || !cb)
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	dev->iamthif_state = MEI_IAMTHIF_WRITING;
+	dev->iamthif_current_cb = cb;
+	dev->iamthif_file_object = cb->file_object;
+	dev->iamthif_canceled = false;
+
+	ret = mei_cl_write(cl, cb, false);
+	if (ret < 0)
+		return ret;
+
+	if (cb->completed)
+		cb->status = mei_amthif_read_start(cl, cb->file_object);
+
+	return 0;
+}
+
+/**
+ * mei_amthif_run_next_cmd - send next amt command from queue
+ *
+ * @dev: the device structure
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+int mei_amthif_run_next_cmd(struct mei_device *dev)
+{
+	struct mei_cl *cl = &dev->iamthif_cl;
+	struct mei_cl_cb *cb;
+
+	dev->iamthif_canceled = false;
+	dev->iamthif_state = MEI_IAMTHIF_IDLE;
+	dev->iamthif_timer = 0;
+	dev->iamthif_file_object = NULL;
+
+	dev_dbg(dev->dev, "complete amthif cmd_list cb.\n");
+
+	cb = list_first_entry_or_null(&dev->amthif_cmd_list.list,
+					typeof(*cb), list);
+	if (!cb)
+		return 0;
+
+	list_del_init(&cb->list);
+	return mei_amthif_send_cmd(cl, cb);
+}
+
+/**
+ * mei_amthif_write - write amthif data to amthif client
+ *
+ * @cl: host client
+ * @cb: mei call back struct
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+int mei_amthif_write(struct mei_cl *cl, struct mei_cl_cb *cb)
+{
+
+	struct mei_device *dev;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	if (WARN_ON(!cb))
+		return -EINVAL;
+
+	dev = cl->dev;
+
+	list_add_tail(&cb->list, &dev->amthif_cmd_list.list);
+	return mei_amthif_run_next_cmd(dev);
+}
+
+/**
+ * mei_amthif_poll - the amthif poll function
+ *
+ * @dev: the device structure
+ * @file: pointer to file structure
+ * @wait: pointer to poll_table structure
+ *
+ * Return: poll mask
+ *
+ * Locking: called under "dev->device_lock" lock
+ */
+
+unsigned int mei_amthif_poll(struct mei_device *dev,
+		struct file *file, poll_table *wait)
+{
+	unsigned int mask = 0;
+
+	poll_wait(file, &dev->iamthif_cl.wait, wait);
+
+	if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE &&
+	    dev->iamthif_file_object == file) {
+
+		mask |= POLLIN | POLLRDNORM;
+		mei_amthif_run_next_cmd(dev);
+	}
+
+	return mask;
+}
+
+
+
+/**
+ * mei_amthif_irq_write - write iamthif command in irq thread context.
+ *
+ * @cl: private data of the file object.
+ * @cb: callback block.
+ * @cmpl_list: complete list.
+ *
+ * Return: 0, OK; otherwise, error.
+ */
+int mei_amthif_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
+			 struct mei_cl_cb *cmpl_list)
+{
+	int ret;
+
+	ret = mei_cl_irq_write(cl, cb, cmpl_list);
+	if (ret)
+		return ret;
+
+	if (cb->completed)
+		cb->status = mei_amthif_read_start(cl, cb->file_object);
+
+	return 0;
+}
+
+/**
+ * mei_amthif_irq_read_msg - read routine after ISR to
+ *			handle the read amthif message
+ *
+ * @cl: mei client
+ * @mei_hdr: header of amthif message
+ * @cmpl_list: completed callbacks list
+ *
+ * Return: -ENODEV if cb is NULL 0 otherwise; error message is in cb->status
+ */
+int mei_amthif_irq_read_msg(struct mei_cl *cl,
+			    struct mei_msg_hdr *mei_hdr,
+			    struct mei_cl_cb *cmpl_list)
+{
+	struct mei_device *dev;
+	int ret;
+
+	dev = cl->dev;
+
+	if (dev->iamthif_state != MEI_IAMTHIF_READING)
+		return 0;
+
+	ret = mei_cl_irq_read_msg(cl, mei_hdr, cmpl_list);
+	if (ret)
+		return ret;
+
+	if (!mei_hdr->msg_complete)
+		return 0;
+
+	dev_dbg(dev->dev, "completed amthif read.\n ");
+	dev->iamthif_current_cb = NULL;
+	dev->iamthif_stall_timer = 0;
+
+	return 0;
+}
+
+/**
+ * mei_amthif_complete - complete amthif callback.
+ *
+ * @dev: the device structure.
+ * @cb: callback block.
+ */
+void mei_amthif_complete(struct mei_device *dev, struct mei_cl_cb *cb)
+{
+
+	if (cb->fop_type == MEI_FOP_WRITE) {
+		if (!cb->status) {
+			dev->iamthif_stall_timer = MEI_IAMTHIF_STALL_TIMER;
+			mei_io_cb_free(cb);
+			return;
+		}
+		/*
+		 * in case of error enqueue the write cb to complete read list
+		 * so it can be propagated to the reader
+		 */
+		list_add_tail(&cb->list, &dev->amthif_rd_complete_list.list);
+		wake_up_interruptible(&dev->iamthif_cl.wait);
+		return;
+	}
+
+	if (dev->iamthif_canceled != 1) {
+		dev->iamthif_state = MEI_IAMTHIF_READ_COMPLETE;
+		dev->iamthif_stall_timer = 0;
+		list_add_tail(&cb->list, &dev->amthif_rd_complete_list.list);
+		dev_dbg(dev->dev, "amthif read completed\n");
+		dev->iamthif_timer = jiffies;
+		dev_dbg(dev->dev, "dev->iamthif_timer = %ld\n",
+			dev->iamthif_timer);
+	} else {
+		mei_amthif_run_next_cmd(dev);
+	}
+
+	dev_dbg(dev->dev, "completing amthif call back.\n");
+	wake_up_interruptible(&dev->iamthif_cl.wait);
+}
+
+/**
+ * mei_clear_list - removes all callbacks associated with file
+ *		from mei_cb_list
+ *
+ * @dev: device structure.
+ * @file: file structure
+ * @mei_cb_list: callbacks list
+ *
+ * mei_clear_list is called to clear resources associated with file
+ * when application calls close function or Ctrl-C was pressed
+ *
+ * Return: true if callback removed from the list, false otherwise
+ */
+static bool mei_clear_list(struct mei_device *dev,
+		const struct file *file, struct list_head *mei_cb_list)
+{
+	struct mei_cl *cl = &dev->iamthif_cl;
+	struct mei_cl_cb *cb, *next;
+	bool removed = false;
+
+	/* list all list member */
+	list_for_each_entry_safe(cb, next, mei_cb_list, list) {
+		/* check if list member associated with a file */
+		if (file == cb->file_object) {
+			/* check if cb equal to current iamthif cb */
+			if (dev->iamthif_current_cb == cb) {
+				dev->iamthif_current_cb = NULL;
+				/* send flow control to iamthif client */
+				mei_hbm_cl_flow_control_req(dev, cl);
+			}
+			/* free all allocated buffers */
+			mei_io_cb_free(cb);
+			removed = true;
+		}
+	}
+	return removed;
+}
+
+/**
+ * mei_clear_lists - removes all callbacks associated with file
+ *
+ * @dev: device structure
+ * @file: file structure
+ *
+ * mei_clear_lists is called to clear resources associated with file
+ * when application calls close function or Ctrl-C was pressed
+ *
+ * Return: true if callback removed from the list, false otherwise
+ */
+static bool mei_clear_lists(struct mei_device *dev, struct file *file)
+{
+	bool removed = false;
+
+	/* remove callbacks associated with a file */
+	mei_clear_list(dev, file, &dev->amthif_cmd_list.list);
+	if (mei_clear_list(dev, file, &dev->amthif_rd_complete_list.list))
+		removed = true;
+
+	mei_clear_list(dev, file, &dev->ctrl_rd_list.list);
+
+	if (mei_clear_list(dev, file, &dev->ctrl_wr_list.list))
+		removed = true;
+
+	if (mei_clear_list(dev, file, &dev->write_waiting_list.list))
+		removed = true;
+
+	if (mei_clear_list(dev, file, &dev->write_list.list))
+		removed = true;
+
+	/* check if iamthif_current_cb not NULL */
+	if (dev->iamthif_current_cb && !removed) {
+		/* check file and iamthif current cb association */
+		if (dev->iamthif_current_cb->file_object == file) {
+			/* remove cb */
+			mei_io_cb_free(dev->iamthif_current_cb);
+			dev->iamthif_current_cb = NULL;
+			removed = true;
+		}
+	}
+	return removed;
+}
+
+/**
+* mei_amthif_release - the release function
+*
+*  @dev: device structure
+*  @file: pointer to file structure
+*
+*  Return: 0 on success, <0 on error
+*/
+int mei_amthif_release(struct mei_device *dev, struct file *file)
+{
+	if (dev->iamthif_open_count > 0)
+		dev->iamthif_open_count--;
+
+	if (dev->iamthif_file_object == file &&
+	    dev->iamthif_state != MEI_IAMTHIF_IDLE) {
+
+		dev_dbg(dev->dev, "amthif canceled iamthif state %d\n",
+		    dev->iamthif_state);
+		dev->iamthif_canceled = true;
+		if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE) {
+			dev_dbg(dev->dev, "run next amthif iamthif cb\n");
+			mei_amthif_run_next_cmd(dev);
+		}
+	}
+
+	if (mei_clear_lists(dev, file))
+		dev->iamthif_state = MEI_IAMTHIF_IDLE;
+
+	return 0;
+}
diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c
new file mode 100644
index 000000000..4cf38c398
--- /dev/null
+++ b/drivers/misc/mei/bus.c
@@ -0,0 +1,537 @@
+/*
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2012-2013, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/mutex.h>
+#include <linux/interrupt.h>
+#include <linux/mei_cl_bus.h>
+
+#include "mei_dev.h"
+#include "client.h"
+
+#define to_mei_cl_driver(d) container_of(d, struct mei_cl_driver, driver)
+#define to_mei_cl_device(d) container_of(d, struct mei_cl_device, dev)
+
+static int mei_cl_device_match(struct device *dev, struct device_driver *drv)
+{
+	struct mei_cl_device *device = to_mei_cl_device(dev);
+	struct mei_cl_driver *driver = to_mei_cl_driver(drv);
+	const struct mei_cl_device_id *id;
+
+	if (!device)
+		return 0;
+
+	if (!driver || !driver->id_table)
+		return 0;
+
+	id = driver->id_table;
+
+	while (id->name[0]) {
+		if (!strncmp(dev_name(dev), id->name, sizeof(id->name)))
+			return 1;
+
+		id++;
+	}
+
+	return 0;
+}
+
+static int mei_cl_device_probe(struct device *dev)
+{
+	struct mei_cl_device *device = to_mei_cl_device(dev);
+	struct mei_cl_driver *driver;
+	struct mei_cl_device_id id;
+
+	if (!device)
+		return 0;
+
+	driver = to_mei_cl_driver(dev->driver);
+	if (!driver || !driver->probe)
+		return -ENODEV;
+
+	dev_dbg(dev, "Device probe\n");
+
+	strlcpy(id.name, dev_name(dev), sizeof(id.name));
+
+	return driver->probe(device, &id);
+}
+
+static int mei_cl_device_remove(struct device *dev)
+{
+	struct mei_cl_device *device = to_mei_cl_device(dev);
+	struct mei_cl_driver *driver;
+
+	if (!device || !dev->driver)
+		return 0;
+
+	if (device->event_cb) {
+		device->event_cb = NULL;
+		cancel_work_sync(&device->event_work);
+	}
+
+	driver = to_mei_cl_driver(dev->driver);
+	if (!driver->remove) {
+		dev->driver = NULL;
+
+		return 0;
+	}
+
+	return driver->remove(device);
+}
+
+static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
+			     char *buf)
+{
+	int len;
+
+	len = snprintf(buf, PAGE_SIZE, "mei:%s\n", dev_name(dev));
+
+	return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
+}
+static DEVICE_ATTR_RO(modalias);
+
+static struct attribute *mei_cl_dev_attrs[] = {
+	&dev_attr_modalias.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(mei_cl_dev);
+
+static int mei_cl_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+	if (add_uevent_var(env, "MODALIAS=mei:%s", dev_name(dev)))
+		return -ENOMEM;
+
+	return 0;
+}
+
+static struct bus_type mei_cl_bus_type = {
+	.name		= "mei",
+	.dev_groups	= mei_cl_dev_groups,
+	.match		= mei_cl_device_match,
+	.probe		= mei_cl_device_probe,
+	.remove		= mei_cl_device_remove,
+	.uevent		= mei_cl_uevent,
+};
+
+static void mei_cl_dev_release(struct device *dev)
+{
+	kfree(to_mei_cl_device(dev));
+}
+
+static struct device_type mei_cl_device_type = {
+	.release	= mei_cl_dev_release,
+};
+
+struct mei_cl *mei_cl_bus_find_cl_by_uuid(struct mei_device *dev,
+						uuid_le uuid)
+{
+	struct mei_cl *cl;
+
+	list_for_each_entry(cl, &dev->device_list, device_link) {
+		if (!uuid_le_cmp(uuid, cl->cl_uuid))
+			return cl;
+	}
+
+	return NULL;
+}
+struct mei_cl_device *mei_cl_add_device(struct mei_device *dev,
+					uuid_le uuid, char *name,
+					struct mei_cl_ops *ops)
+{
+	struct mei_cl_device *device;
+	struct mei_cl *cl;
+	int status;
+
+	cl = mei_cl_bus_find_cl_by_uuid(dev, uuid);
+	if (cl == NULL)
+		return NULL;
+
+	device = kzalloc(sizeof(struct mei_cl_device), GFP_KERNEL);
+	if (!device)
+		return NULL;
+
+	device->cl = cl;
+	device->ops = ops;
+
+	device->dev.parent = dev->dev;
+	device->dev.bus = &mei_cl_bus_type;
+	device->dev.type = &mei_cl_device_type;
+
+	dev_set_name(&device->dev, "%s", name);
+
+	status = device_register(&device->dev);
+	if (status) {
+		dev_err(dev->dev, "Failed to register MEI device\n");
+		kfree(device);
+		return NULL;
+	}
+
+	cl->device = device;
+
+	dev_dbg(&device->dev, "client %s registered\n", name);
+
+	return device;
+}
+EXPORT_SYMBOL_GPL(mei_cl_add_device);
+
+void mei_cl_remove_device(struct mei_cl_device *device)
+{
+	device_unregister(&device->dev);
+}
+EXPORT_SYMBOL_GPL(mei_cl_remove_device);
+
+int __mei_cl_driver_register(struct mei_cl_driver *driver, struct module *owner)
+{
+	int err;
+
+	driver->driver.name = driver->name;
+	driver->driver.owner = owner;
+	driver->driver.bus = &mei_cl_bus_type;
+
+	err = driver_register(&driver->driver);
+	if (err)
+		return err;
+
+	pr_debug("mei: driver [%s] registered\n", driver->driver.name);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(__mei_cl_driver_register);
+
+void mei_cl_driver_unregister(struct mei_cl_driver *driver)
+{
+	driver_unregister(&driver->driver);
+
+	pr_debug("mei: driver [%s] unregistered\n", driver->driver.name);
+}
+EXPORT_SYMBOL_GPL(mei_cl_driver_unregister);
+
+static ssize_t ___mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length,
+			bool blocking)
+{
+	struct mei_device *dev;
+	struct mei_me_client *me_cl = NULL;
+	struct mei_cl_cb *cb = NULL;
+	ssize_t rets;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	mutex_lock(&dev->device_lock);
+	if (!mei_cl_is_connected(cl)) {
+		rets = -ENODEV;
+		goto out;
+	}
+
+	/* Check if we have an ME client device */
+	me_cl = mei_me_cl_by_uuid_id(dev, &cl->cl_uuid, cl->me_client_id);
+	if (!me_cl) {
+		rets = -ENOTTY;
+		goto out;
+	}
+
+	if (length > me_cl->props.max_msg_length) {
+		rets = -EFBIG;
+		goto out;
+	}
+
+	cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, NULL);
+	if (!cb) {
+		rets = -ENOMEM;
+		goto out;
+	}
+
+	memcpy(cb->buf.data, buf, length);
+
+	rets = mei_cl_write(cl, cb, blocking);
+
+out:
+	mei_me_cl_put(me_cl);
+	mutex_unlock(&dev->device_lock);
+	if (rets < 0)
+		mei_io_cb_free(cb);
+
+	return rets;
+}
+
+ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length)
+{
+	struct mei_device *dev;
+	struct mei_cl_cb *cb;
+	size_t r_length;
+	ssize_t rets;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	mutex_lock(&dev->device_lock);
+
+	cb = mei_cl_read_cb(cl, NULL);
+	if (cb)
+		goto copy;
+
+	rets = mei_cl_read_start(cl, length, NULL);
+	if (rets && rets != -EBUSY)
+		goto out;
+
+	if (list_empty(&cl->rd_completed) && !waitqueue_active(&cl->rx_wait)) {
+
+		mutex_unlock(&dev->device_lock);
+
+		if (wait_event_interruptible(cl->rx_wait,
+				(!list_empty(&cl->rd_completed)) ||
+				(!mei_cl_is_connected(cl)))) {
+
+			if (signal_pending(current))
+				return -EINTR;
+			return -ERESTARTSYS;
+		}
+
+		mutex_lock(&dev->device_lock);
+
+		if (!mei_cl_is_connected(cl)) {
+			rets = -EBUSY;
+			goto out;
+		}
+	}
+
+	cb = mei_cl_read_cb(cl, NULL);
+	if (!cb) {
+		rets = 0;
+		goto out;
+	}
+
+copy:
+	if (cb->status) {
+		rets = cb->status;
+		goto free;
+	}
+
+	r_length = min_t(size_t, length, cb->buf_idx);
+	memcpy(buf, cb->buf.data, r_length);
+	rets = r_length;
+
+free:
+	mei_io_cb_free(cb);
+out:
+	mutex_unlock(&dev->device_lock);
+
+	return rets;
+}
+
+inline ssize_t __mei_cl_async_send(struct mei_cl *cl, u8 *buf, size_t length)
+{
+	return ___mei_cl_send(cl, buf, length, 0);
+}
+
+inline ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length)
+{
+	return ___mei_cl_send(cl, buf, length, 1);
+}
+
+ssize_t mei_cl_send(struct mei_cl_device *device, u8 *buf, size_t length)
+{
+	struct mei_cl *cl = device->cl;
+
+	if (cl == NULL)
+		return -ENODEV;
+
+	if (device->ops && device->ops->send)
+		return device->ops->send(device, buf, length);
+
+	return __mei_cl_send(cl, buf, length);
+}
+EXPORT_SYMBOL_GPL(mei_cl_send);
+
+ssize_t mei_cl_recv(struct mei_cl_device *device, u8 *buf, size_t length)
+{
+	struct mei_cl *cl =  device->cl;
+
+	if (cl == NULL)
+		return -ENODEV;
+
+	if (device->ops && device->ops->recv)
+		return device->ops->recv(device, buf, length);
+
+	return __mei_cl_recv(cl, buf, length);
+}
+EXPORT_SYMBOL_GPL(mei_cl_recv);
+
+static void mei_bus_event_work(struct work_struct *work)
+{
+	struct mei_cl_device *device;
+
+	device = container_of(work, struct mei_cl_device, event_work);
+
+	if (device->event_cb)
+		device->event_cb(device, device->events, device->event_context);
+
+	device->events = 0;
+
+	/* Prepare for the next read */
+	mei_cl_read_start(device->cl, 0, NULL);
+}
+
+int mei_cl_register_event_cb(struct mei_cl_device *device,
+			  mei_cl_event_cb_t event_cb, void *context)
+{
+	if (device->event_cb)
+		return -EALREADY;
+
+	device->events = 0;
+	device->event_cb = event_cb;
+	device->event_context = context;
+	INIT_WORK(&device->event_work, mei_bus_event_work);
+
+	mei_cl_read_start(device->cl, 0, NULL);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mei_cl_register_event_cb);
+
+void *mei_cl_get_drvdata(const struct mei_cl_device *device)
+{
+	return dev_get_drvdata(&device->dev);
+}
+EXPORT_SYMBOL_GPL(mei_cl_get_drvdata);
+
+void mei_cl_set_drvdata(struct mei_cl_device *device, void *data)
+{
+	dev_set_drvdata(&device->dev, data);
+}
+EXPORT_SYMBOL_GPL(mei_cl_set_drvdata);
+
+int mei_cl_enable_device(struct mei_cl_device *device)
+{
+	int err;
+	struct mei_device *dev;
+	struct mei_cl *cl = device->cl;
+
+	if (cl == NULL)
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	mutex_lock(&dev->device_lock);
+
+	err = mei_cl_connect(cl, NULL);
+	if (err < 0) {
+		mutex_unlock(&dev->device_lock);
+		dev_err(dev->dev, "Could not connect to the ME client");
+
+		return err;
+	}
+
+	mutex_unlock(&dev->device_lock);
+
+	if (device->event_cb)
+		mei_cl_read_start(device->cl, 0, NULL);
+
+	if (!device->ops || !device->ops->enable)
+		return 0;
+
+	return device->ops->enable(device);
+}
+EXPORT_SYMBOL_GPL(mei_cl_enable_device);
+
+int mei_cl_disable_device(struct mei_cl_device *device)
+{
+	int err;
+	struct mei_device *dev;
+	struct mei_cl *cl = device->cl;
+
+	if (cl == NULL)
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	if (device->ops && device->ops->disable)
+		device->ops->disable(device);
+
+	device->event_cb = NULL;
+
+	mutex_lock(&dev->device_lock);
+
+	if (!mei_cl_is_connected(cl)) {
+		dev_err(dev->dev, "Already disconnected");
+		err = 0;
+		goto out;
+	}
+
+	cl->state = MEI_FILE_DISCONNECTING;
+
+	err = mei_cl_disconnect(cl);
+	if (err < 0) {
+		dev_err(dev->dev, "Could not disconnect from the ME client");
+		goto out;
+	}
+
+	/* Flush queues and remove any pending read */
+	mei_cl_flush_queues(cl, NULL);
+
+out:
+	mutex_unlock(&dev->device_lock);
+	return err;
+
+}
+EXPORT_SYMBOL_GPL(mei_cl_disable_device);
+
+void mei_cl_bus_rx_event(struct mei_cl *cl)
+{
+	struct mei_cl_device *device = cl->device;
+
+	if (!device || !device->event_cb)
+		return;
+
+	set_bit(MEI_CL_EVENT_RX, &device->events);
+
+	schedule_work(&device->event_work);
+}
+
+void mei_cl_bus_remove_devices(struct mei_device *dev)
+{
+	struct mei_cl *cl, *next;
+
+	mutex_lock(&dev->device_lock);
+	list_for_each_entry_safe(cl, next, &dev->device_list, device_link) {
+		if (cl->device)
+			mei_cl_remove_device(cl->device);
+
+		list_del(&cl->device_link);
+		mei_cl_unlink(cl);
+		kfree(cl);
+	}
+	mutex_unlock(&dev->device_lock);
+}
+
+int __init mei_cl_bus_init(void)
+{
+	return bus_register(&mei_cl_bus_type);
+}
+
+void __exit mei_cl_bus_exit(void)
+{
+	bus_unregister(&mei_cl_bus_type);
+}
diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
new file mode 100644
index 000000000..b2b9f4382
--- /dev/null
+++ b/drivers/misc/mei/client.c
@@ -0,0 +1,1360 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2003-2012, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/pm_runtime.h>
+
+#include <linux/mei.h>
+
+#include "mei_dev.h"
+#include "hbm.h"
+#include "client.h"
+
+/**
+ * mei_me_cl_init - initialize me client
+ *
+ * @me_cl: me client
+ */
+void mei_me_cl_init(struct mei_me_client *me_cl)
+{
+	INIT_LIST_HEAD(&me_cl->list);
+	kref_init(&me_cl->refcnt);
+}
+
+/**
+ * mei_me_cl_get - increases me client refcount
+ *
+ * @me_cl: me client
+ *
+ * Locking: called under "dev->device_lock" lock
+ *
+ * Return: me client or NULL
+ */
+struct mei_me_client *mei_me_cl_get(struct mei_me_client *me_cl)
+{
+	if (me_cl && kref_get_unless_zero(&me_cl->refcnt))
+		return me_cl;
+
+	return NULL;
+}
+
+/**
+ * mei_me_cl_release - free me client
+ *
+ * Locking: called under "dev->device_lock" lock
+ *
+ * @ref: me_client refcount
+ */
+static void mei_me_cl_release(struct kref *ref)
+{
+	struct mei_me_client *me_cl =
+		container_of(ref, struct mei_me_client, refcnt);
+
+	kfree(me_cl);
+}
+
+/**
+ * mei_me_cl_put - decrease me client refcount and free client if necessary
+ *
+ * Locking: called under "dev->device_lock" lock
+ *
+ * @me_cl: me client
+ */
+void mei_me_cl_put(struct mei_me_client *me_cl)
+{
+	if (me_cl)
+		kref_put(&me_cl->refcnt, mei_me_cl_release);
+}
+
+/**
+ * __mei_me_cl_del  - delete me client form the list and decrease
+ *     reference counter
+ *
+ * @dev: mei device
+ * @me_cl: me client
+ *
+ * Locking: dev->me_clients_rwsem
+ */
+static void __mei_me_cl_del(struct mei_device *dev, struct mei_me_client *me_cl)
+{
+	if (!me_cl)
+		return;
+
+	list_del(&me_cl->list);
+	mei_me_cl_put(me_cl);
+}
+
+/**
+ * mei_me_cl_add - add me client to the list
+ *
+ * @dev: mei device
+ * @me_cl: me client
+ */
+void mei_me_cl_add(struct mei_device *dev, struct mei_me_client *me_cl)
+{
+	down_write(&dev->me_clients_rwsem);
+	list_add(&me_cl->list, &dev->me_clients);
+	up_write(&dev->me_clients_rwsem);
+}
+
+/**
+ * __mei_me_cl_by_uuid - locate me client by uuid
+ *	increases ref count
+ *
+ * @dev: mei device
+ * @uuid: me client uuid
+ *
+ * Return: me client or NULL if not found
+ *
+ * Locking: dev->me_clients_rwsem
+ */
+static struct mei_me_client *__mei_me_cl_by_uuid(struct mei_device *dev,
+					const uuid_le *uuid)
+{
+	struct mei_me_client *me_cl;
+	const uuid_le *pn;
+
+	WARN_ON(!rwsem_is_locked(&dev->me_clients_rwsem));
+
+	list_for_each_entry(me_cl, &dev->me_clients, list) {
+		pn = &me_cl->props.protocol_name;
+		if (uuid_le_cmp(*uuid, *pn) == 0)
+			return mei_me_cl_get(me_cl);
+	}
+
+	return NULL;
+}
+
+/**
+ * mei_me_cl_by_uuid - locate me client by uuid
+ *	increases ref count
+ *
+ * @dev: mei device
+ * @uuid: me client uuid
+ *
+ * Return: me client or NULL if not found
+ *
+ * Locking: dev->me_clients_rwsem
+ */
+struct mei_me_client *mei_me_cl_by_uuid(struct mei_device *dev,
+					const uuid_le *uuid)
+{
+	struct mei_me_client *me_cl;
+
+	down_read(&dev->me_clients_rwsem);
+	me_cl = __mei_me_cl_by_uuid(dev, uuid);
+	up_read(&dev->me_clients_rwsem);
+
+	return me_cl;
+}
+
+/**
+ * mei_me_cl_by_id - locate me client by client id
+ *	increases ref count
+ *
+ * @dev: the device structure
+ * @client_id: me client id
+ *
+ * Return: me client or NULL if not found
+ *
+ * Locking: dev->me_clients_rwsem
+ */
+struct mei_me_client *mei_me_cl_by_id(struct mei_device *dev, u8 client_id)
+{
+
+	struct mei_me_client *__me_cl, *me_cl = NULL;
+
+	down_read(&dev->me_clients_rwsem);
+	list_for_each_entry(__me_cl, &dev->me_clients, list) {
+		if (__me_cl->client_id == client_id) {
+			me_cl = mei_me_cl_get(__me_cl);
+			break;
+		}
+	}
+	up_read(&dev->me_clients_rwsem);
+
+	return me_cl;
+}
+
+/**
+ * __mei_me_cl_by_uuid_id - locate me client by client id and uuid
+ *	increases ref count
+ *
+ * @dev: the device structure
+ * @uuid: me client uuid
+ * @client_id: me client id
+ *
+ * Return: me client or null if not found
+ *
+ * Locking: dev->me_clients_rwsem
+ */
+static struct mei_me_client *__mei_me_cl_by_uuid_id(struct mei_device *dev,
+					   const uuid_le *uuid, u8 client_id)
+{
+	struct mei_me_client *me_cl;
+	const uuid_le *pn;
+
+	WARN_ON(!rwsem_is_locked(&dev->me_clients_rwsem));
+
+	list_for_each_entry(me_cl, &dev->me_clients, list) {
+		pn = &me_cl->props.protocol_name;
+		if (uuid_le_cmp(*uuid, *pn) == 0 &&
+		    me_cl->client_id == client_id)
+			return mei_me_cl_get(me_cl);
+	}
+
+	return NULL;
+}
+
+
+/**
+ * mei_me_cl_by_uuid_id - locate me client by client id and uuid
+ *	increases ref count
+ *
+ * @dev: the device structure
+ * @uuid: me client uuid
+ * @client_id: me client id
+ *
+ * Return: me client or null if not found
+ */
+struct mei_me_client *mei_me_cl_by_uuid_id(struct mei_device *dev,
+					   const uuid_le *uuid, u8 client_id)
+{
+	struct mei_me_client *me_cl;
+
+	down_read(&dev->me_clients_rwsem);
+	me_cl = __mei_me_cl_by_uuid_id(dev, uuid, client_id);
+	up_read(&dev->me_clients_rwsem);
+
+	return me_cl;
+}
+
+/**
+ * mei_me_cl_rm_by_uuid - remove all me clients matching uuid
+ *
+ * @dev: the device structure
+ * @uuid: me client uuid
+ *
+ * Locking: called under "dev->device_lock" lock
+ */
+void mei_me_cl_rm_by_uuid(struct mei_device *dev, const uuid_le *uuid)
+{
+	struct mei_me_client *me_cl;
+
+	dev_dbg(dev->dev, "remove %pUl\n", uuid);
+
+	down_write(&dev->me_clients_rwsem);
+	me_cl = __mei_me_cl_by_uuid(dev, uuid);
+	__mei_me_cl_del(dev, me_cl);
+	up_write(&dev->me_clients_rwsem);
+}
+
+/**
+ * mei_me_cl_rm_by_uuid_id - remove all me clients matching client id
+ *
+ * @dev: the device structure
+ * @uuid: me client uuid
+ * @id: me client id
+ *
+ * Locking: called under "dev->device_lock" lock
+ */
+void mei_me_cl_rm_by_uuid_id(struct mei_device *dev, const uuid_le *uuid, u8 id)
+{
+	struct mei_me_client *me_cl;
+
+	dev_dbg(dev->dev, "remove %pUl %d\n", uuid, id);
+
+	down_write(&dev->me_clients_rwsem);
+	me_cl = __mei_me_cl_by_uuid_id(dev, uuid, id);
+	__mei_me_cl_del(dev, me_cl);
+	up_write(&dev->me_clients_rwsem);
+}
+
+/**
+ * mei_me_cl_rm_all - remove all me clients
+ *
+ * @dev: the device structure
+ *
+ * Locking: called under "dev->device_lock" lock
+ */
+void mei_me_cl_rm_all(struct mei_device *dev)
+{
+	struct mei_me_client *me_cl, *next;
+
+	down_write(&dev->me_clients_rwsem);
+	list_for_each_entry_safe(me_cl, next, &dev->me_clients, list)
+		__mei_me_cl_del(dev, me_cl);
+	up_write(&dev->me_clients_rwsem);
+}
+
+/**
+ * mei_cl_cmp_id - tells if the clients are the same
+ *
+ * @cl1: host client 1
+ * @cl2: host client 2
+ *
+ * Return: true  - if the clients has same host and me ids
+ *         false - otherwise
+ */
+static inline bool mei_cl_cmp_id(const struct mei_cl *cl1,
+				const struct mei_cl *cl2)
+{
+	return cl1 && cl2 &&
+		(cl1->host_client_id == cl2->host_client_id) &&
+		(cl1->me_client_id == cl2->me_client_id);
+}
+
+/**
+ * mei_io_cb_free - free mei_cb_private related memory
+ *
+ * @cb: mei callback struct
+ */
+void mei_io_cb_free(struct mei_cl_cb *cb)
+{
+	if (cb == NULL)
+		return;
+
+	list_del(&cb->list);
+	kfree(cb->buf.data);
+	kfree(cb);
+}
+
+/**
+ * mei_io_cb_init - allocate and initialize io callback
+ *
+ * @cl: mei client
+ * @type: operation type
+ * @fp: pointer to file structure
+ *
+ * Return: mei_cl_cb pointer or NULL;
+ */
+struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl, enum mei_cb_file_ops type,
+				 struct file *fp)
+{
+	struct mei_cl_cb *cb;
+
+	cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL);
+	if (!cb)
+		return NULL;
+
+	INIT_LIST_HEAD(&cb->list);
+	cb->file_object = fp;
+	cb->cl = cl;
+	cb->buf_idx = 0;
+	cb->fop_type = type;
+	return cb;
+}
+
+/**
+ * __mei_io_list_flush - removes and frees cbs belonging to cl.
+ *
+ * @list:  an instance of our list structure
+ * @cl:    host client, can be NULL for flushing the whole list
+ * @free:  whether to free the cbs
+ */
+static void __mei_io_list_flush(struct mei_cl_cb *list,
+				struct mei_cl *cl, bool free)
+{
+	struct mei_cl_cb *cb, *next;
+
+	/* enable removing everything if no cl is specified */
+	list_for_each_entry_safe(cb, next, &list->list, list) {
+		if (!cl || mei_cl_cmp_id(cl, cb->cl)) {
+			list_del_init(&cb->list);
+			if (free)
+				mei_io_cb_free(cb);
+		}
+	}
+}
+
+/**
+ * mei_io_list_flush - removes list entry belonging to cl.
+ *
+ * @list:  An instance of our list structure
+ * @cl: host client
+ */
+void mei_io_list_flush(struct mei_cl_cb *list, struct mei_cl *cl)
+{
+	__mei_io_list_flush(list, cl, false);
+}
+
+/**
+ * mei_io_list_free - removes cb belonging to cl and free them
+ *
+ * @list:  An instance of our list structure
+ * @cl: host client
+ */
+static inline void mei_io_list_free(struct mei_cl_cb *list, struct mei_cl *cl)
+{
+	__mei_io_list_flush(list, cl, true);
+}
+
+/**
+ * mei_io_cb_alloc_buf - allocate callback buffer
+ *
+ * @cb: io callback structure
+ * @length: size of the buffer
+ *
+ * Return: 0 on success
+ *         -EINVAL if cb is NULL
+ *         -ENOMEM if allocation failed
+ */
+int mei_io_cb_alloc_buf(struct mei_cl_cb *cb, size_t length)
+{
+	if (!cb)
+		return -EINVAL;
+
+	if (length == 0)
+		return 0;
+
+	cb->buf.data = kmalloc(length, GFP_KERNEL);
+	if (!cb->buf.data)
+		return -ENOMEM;
+	cb->buf.size = length;
+	return 0;
+}
+
+/**
+ * mei_cl_alloc_cb - a convenient wrapper for allocating read cb
+ *
+ * @cl: host client
+ * @length: size of the buffer
+ * @type: operation type
+ * @fp: associated file pointer (might be NULL)
+ *
+ * Return: cb on success and NULL on failure
+ */
+struct mei_cl_cb *mei_cl_alloc_cb(struct mei_cl *cl, size_t length,
+				  enum mei_cb_file_ops type, struct file *fp)
+{
+	struct mei_cl_cb *cb;
+
+	cb = mei_io_cb_init(cl, type, fp);
+	if (!cb)
+		return NULL;
+
+	if (mei_io_cb_alloc_buf(cb, length)) {
+		mei_io_cb_free(cb);
+		return NULL;
+	}
+
+	return cb;
+}
+
+/**
+ * mei_cl_read_cb - find this cl's callback in the read list
+ *     for a specific file
+ *
+ * @cl: host client
+ * @fp: file pointer (matching cb file object), may be NULL
+ *
+ * Return: cb on success, NULL if cb is not found
+ */
+struct mei_cl_cb *mei_cl_read_cb(const struct mei_cl *cl, const struct file *fp)
+{
+	struct mei_cl_cb *cb;
+
+	list_for_each_entry(cb, &cl->rd_completed, list)
+		if (!fp || fp == cb->file_object)
+			return cb;
+
+	return NULL;
+}
+
+/**
+ * mei_cl_read_cb_flush - free client's read pending and completed cbs
+ *   for a specific file
+ *
+ * @cl: host client
+ * @fp: file pointer (matching cb file object), may be NULL
+ */
+void mei_cl_read_cb_flush(const struct mei_cl *cl, const struct file *fp)
+{
+	struct mei_cl_cb *cb, *next;
+
+	list_for_each_entry_safe(cb, next, &cl->rd_completed, list)
+		if (!fp || fp == cb->file_object)
+			mei_io_cb_free(cb);
+
+
+	list_for_each_entry_safe(cb, next, &cl->rd_pending, list)
+		if (!fp || fp == cb->file_object)
+			mei_io_cb_free(cb);
+}
+
+/**
+ * mei_cl_flush_queues - flushes queue lists belonging to cl.
+ *
+ * @cl: host client
+ * @fp: file pointer (matching cb file object), may be NULL
+ *
+ * Return: 0 on success, -EINVAL if cl or cl->dev is NULL.
+ */
+int mei_cl_flush_queues(struct mei_cl *cl, const struct file *fp)
+{
+	struct mei_device *dev;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -EINVAL;
+
+	dev = cl->dev;
+
+	cl_dbg(dev, cl, "remove list entry belonging to cl\n");
+	mei_io_list_free(&cl->dev->write_list, cl);
+	mei_io_list_free(&cl->dev->write_waiting_list, cl);
+	mei_io_list_flush(&cl->dev->ctrl_wr_list, cl);
+	mei_io_list_flush(&cl->dev->ctrl_rd_list, cl);
+	mei_io_list_flush(&cl->dev->amthif_cmd_list, cl);
+	mei_io_list_flush(&cl->dev->amthif_rd_complete_list, cl);
+
+	mei_cl_read_cb_flush(cl, fp);
+
+	return 0;
+}
+
+
+/**
+ * mei_cl_init - initializes cl.
+ *
+ * @cl: host client to be initialized
+ * @dev: mei device
+ */
+void mei_cl_init(struct mei_cl *cl, struct mei_device *dev)
+{
+	memset(cl, 0, sizeof(struct mei_cl));
+	init_waitqueue_head(&cl->wait);
+	init_waitqueue_head(&cl->rx_wait);
+	init_waitqueue_head(&cl->tx_wait);
+	INIT_LIST_HEAD(&cl->rd_completed);
+	INIT_LIST_HEAD(&cl->rd_pending);
+	INIT_LIST_HEAD(&cl->link);
+	INIT_LIST_HEAD(&cl->device_link);
+	cl->writing_state = MEI_IDLE;
+	cl->dev = dev;
+}
+
+/**
+ * mei_cl_allocate - allocates cl  structure and sets it up.
+ *
+ * @dev: mei device
+ * Return:  The allocated file or NULL on failure
+ */
+struct mei_cl *mei_cl_allocate(struct mei_device *dev)
+{
+	struct mei_cl *cl;
+
+	cl = kmalloc(sizeof(struct mei_cl), GFP_KERNEL);
+	if (!cl)
+		return NULL;
+
+	mei_cl_init(cl, dev);
+
+	return cl;
+}
+
+/**
+ * mei_cl_link - allocate host id in the host map
+ *
+ * @cl: host client
+ * @id: fixed host id or MEI_HOST_CLIENT_ID_ANY (-1) for generic one
+ *
+ * Return: 0 on success
+ *	-EINVAL on incorrect values
+ *	-EMFILE if open count exceeded.
+ */
+int mei_cl_link(struct mei_cl *cl, int id)
+{
+	struct mei_device *dev;
+	long open_handle_count;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -EINVAL;
+
+	dev = cl->dev;
+
+	/* If Id is not assigned get one*/
+	if (id == MEI_HOST_CLIENT_ID_ANY)
+		id = find_first_zero_bit(dev->host_clients_map,
+					MEI_CLIENTS_MAX);
+
+	if (id >= MEI_CLIENTS_MAX) {
+		dev_err(dev->dev, "id exceeded %d", MEI_CLIENTS_MAX);
+		return -EMFILE;
+	}
+
+	open_handle_count = dev->open_handle_count + dev->iamthif_open_count;
+	if (open_handle_count >= MEI_MAX_OPEN_HANDLE_COUNT) {
+		dev_err(dev->dev, "open_handle_count exceeded %d",
+			MEI_MAX_OPEN_HANDLE_COUNT);
+		return -EMFILE;
+	}
+
+	dev->open_handle_count++;
+
+	cl->host_client_id = id;
+	list_add_tail(&cl->link, &dev->file_list);
+
+	set_bit(id, dev->host_clients_map);
+
+	cl->state = MEI_FILE_INITIALIZING;
+
+	cl_dbg(dev, cl, "link cl\n");
+	return 0;
+}
+
+/**
+ * mei_cl_unlink - remove me_cl from the list
+ *
+ * @cl: host client
+ *
+ * Return: always 0
+ */
+int mei_cl_unlink(struct mei_cl *cl)
+{
+	struct mei_device *dev;
+
+	/* don't shout on error exit path */
+	if (!cl)
+		return 0;
+
+	/* wd and amthif might not be initialized */
+	if (!cl->dev)
+		return 0;
+
+	dev = cl->dev;
+
+	cl_dbg(dev, cl, "unlink client");
+
+	if (dev->open_handle_count > 0)
+		dev->open_handle_count--;
+
+	/* never clear the 0 bit */
+	if (cl->host_client_id)
+		clear_bit(cl->host_client_id, dev->host_clients_map);
+
+	list_del_init(&cl->link);
+
+	cl->state = MEI_FILE_INITIALIZING;
+
+	return 0;
+}
+
+
+void mei_host_client_init(struct work_struct *work)
+{
+	struct mei_device *dev =
+		container_of(work, struct mei_device, init_work);
+	struct mei_me_client *me_cl;
+
+	mutex_lock(&dev->device_lock);
+
+
+	me_cl = mei_me_cl_by_uuid(dev, &mei_amthif_guid);
+	if (me_cl)
+		mei_amthif_host_init(dev);
+	mei_me_cl_put(me_cl);
+
+	me_cl = mei_me_cl_by_uuid(dev, &mei_wd_guid);
+	if (me_cl)
+		mei_wd_host_init(dev);
+	mei_me_cl_put(me_cl);
+
+	me_cl = mei_me_cl_by_uuid(dev, &mei_nfc_guid);
+	if (me_cl)
+		mei_nfc_host_init(dev);
+	mei_me_cl_put(me_cl);
+
+
+	dev->dev_state = MEI_DEV_ENABLED;
+	dev->reset_count = 0;
+	mutex_unlock(&dev->device_lock);
+
+	pm_runtime_mark_last_busy(dev->dev);
+	dev_dbg(dev->dev, "rpm: autosuspend\n");
+	pm_runtime_autosuspend(dev->dev);
+}
+
+/**
+ * mei_hbuf_acquire - try to acquire host buffer
+ *
+ * @dev: the device structure
+ * Return: true if host buffer was acquired
+ */
+bool mei_hbuf_acquire(struct mei_device *dev)
+{
+	if (mei_pg_state(dev) == MEI_PG_ON ||
+	    mei_pg_in_transition(dev)) {
+		dev_dbg(dev->dev, "device is in pg\n");
+		return false;
+	}
+
+	if (!dev->hbuf_is_ready) {
+		dev_dbg(dev->dev, "hbuf is not ready\n");
+		return false;
+	}
+
+	dev->hbuf_is_ready = false;
+
+	return true;
+}
+
+/**
+ * mei_cl_disconnect - disconnect host client from the me one
+ *
+ * @cl: host client
+ *
+ * Locking: called under "dev->device_lock" lock
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+int mei_cl_disconnect(struct mei_cl *cl)
+{
+	struct mei_device *dev;
+	struct mei_cl_cb *cb;
+	int rets;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	cl_dbg(dev, cl, "disconnecting");
+
+	if (cl->state != MEI_FILE_DISCONNECTING)
+		return 0;
+
+	rets = pm_runtime_get(dev->dev);
+	if (rets < 0 && rets != -EINPROGRESS) {
+		pm_runtime_put_noidle(dev->dev);
+		cl_err(dev, cl, "rpm: get failed %d\n", rets);
+		return rets;
+	}
+
+	cb = mei_io_cb_init(cl, MEI_FOP_DISCONNECT, NULL);
+	rets = cb ? 0 : -ENOMEM;
+	if (rets)
+		goto free;
+
+	if (mei_hbuf_acquire(dev)) {
+		if (mei_hbm_cl_disconnect_req(dev, cl)) {
+			rets = -ENODEV;
+			cl_err(dev, cl, "failed to disconnect.\n");
+			goto free;
+		}
+		cl->timer_count = MEI_CONNECT_TIMEOUT;
+		mdelay(10); /* Wait for hardware disconnection ready */
+		list_add_tail(&cb->list, &dev->ctrl_rd_list.list);
+	} else {
+		cl_dbg(dev, cl, "add disconnect cb to control write list\n");
+		list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
+
+	}
+	mutex_unlock(&dev->device_lock);
+
+	wait_event_timeout(cl->wait,
+			MEI_FILE_DISCONNECTED == cl->state,
+			mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
+
+	mutex_lock(&dev->device_lock);
+
+	if (MEI_FILE_DISCONNECTED == cl->state) {
+		rets = 0;
+		cl_dbg(dev, cl, "successfully disconnected from FW client.\n");
+	} else {
+		cl_dbg(dev, cl, "timeout on disconnect from FW client.\n");
+		rets = -ETIME;
+	}
+
+	mei_io_list_flush(&dev->ctrl_rd_list, cl);
+	mei_io_list_flush(&dev->ctrl_wr_list, cl);
+free:
+	cl_dbg(dev, cl, "rpm: autosuspend\n");
+	pm_runtime_mark_last_busy(dev->dev);
+	pm_runtime_put_autosuspend(dev->dev);
+
+	mei_io_cb_free(cb);
+	return rets;
+}
+
+
+/**
+ * mei_cl_is_other_connecting - checks if other
+ *    client with the same me client id is connecting
+ *
+ * @cl: private data of the file object
+ *
+ * Return: true if other client is connected, false - otherwise.
+ */
+bool mei_cl_is_other_connecting(struct mei_cl *cl)
+{
+	struct mei_device *dev;
+	struct mei_cl *ocl; /* the other client */
+
+	if (WARN_ON(!cl || !cl->dev))
+		return false;
+
+	dev = cl->dev;
+
+	list_for_each_entry(ocl, &dev->file_list, link) {
+		if (ocl->state == MEI_FILE_CONNECTING &&
+		    ocl != cl &&
+		    cl->me_client_id == ocl->me_client_id)
+			return true;
+
+	}
+
+	return false;
+}
+
+/**
+ * mei_cl_connect - connect host client to the me one
+ *
+ * @cl: host client
+ * @file: pointer to file structure
+ *
+ * Locking: called under "dev->device_lock" lock
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+int mei_cl_connect(struct mei_cl *cl, struct file *file)
+{
+	struct mei_device *dev;
+	struct mei_cl_cb *cb;
+	int rets;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	rets = pm_runtime_get(dev->dev);
+	if (rets < 0 && rets != -EINPROGRESS) {
+		pm_runtime_put_noidle(dev->dev);
+		cl_err(dev, cl, "rpm: get failed %d\n", rets);
+		return rets;
+	}
+
+	cb = mei_io_cb_init(cl, MEI_FOP_CONNECT, file);
+	rets = cb ? 0 : -ENOMEM;
+	if (rets)
+		goto out;
+
+	/* run hbuf acquire last so we don't have to undo */
+	if (!mei_cl_is_other_connecting(cl) && mei_hbuf_acquire(dev)) {
+		cl->state = MEI_FILE_CONNECTING;
+		if (mei_hbm_cl_connect_req(dev, cl)) {
+			rets = -ENODEV;
+			goto out;
+		}
+		cl->timer_count = MEI_CONNECT_TIMEOUT;
+		list_add_tail(&cb->list, &dev->ctrl_rd_list.list);
+	} else {
+		cl->state = MEI_FILE_INITIALIZING;
+		list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
+	}
+
+	mutex_unlock(&dev->device_lock);
+	wait_event_timeout(cl->wait,
+			(cl->state == MEI_FILE_CONNECTED ||
+			 cl->state == MEI_FILE_DISCONNECTED),
+			mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
+	mutex_lock(&dev->device_lock);
+
+	if (!mei_cl_is_connected(cl)) {
+		cl->state = MEI_FILE_DISCONNECTED;
+		/* something went really wrong */
+		if (!cl->status)
+			cl->status = -EFAULT;
+
+		mei_io_list_flush(&dev->ctrl_rd_list, cl);
+		mei_io_list_flush(&dev->ctrl_wr_list, cl);
+	}
+
+	rets = cl->status;
+
+out:
+	cl_dbg(dev, cl, "rpm: autosuspend\n");
+	pm_runtime_mark_last_busy(dev->dev);
+	pm_runtime_put_autosuspend(dev->dev);
+
+	mei_io_cb_free(cb);
+	return rets;
+}
+
+/**
+ * mei_cl_alloc_linked - allocate and link host client
+ *
+ * @dev: the device structure
+ * @id: fixed host id or MEI_HOST_CLIENT_ID_ANY (-1) for generic one
+ *
+ * Return: cl on success ERR_PTR on failure
+ */
+struct mei_cl *mei_cl_alloc_linked(struct mei_device *dev, int id)
+{
+	struct mei_cl *cl;
+	int ret;
+
+	cl = mei_cl_allocate(dev);
+	if (!cl) {
+		ret = -ENOMEM;
+		goto err;
+	}
+
+	ret = mei_cl_link(cl, id);
+	if (ret)
+		goto err;
+
+	return cl;
+err:
+	kfree(cl);
+	return ERR_PTR(ret);
+}
+
+
+
+/**
+ * mei_cl_flow_ctrl_creds - checks flow_control credits for cl.
+ *
+ * @cl: private data of the file object
+ *
+ * Return: 1 if mei_flow_ctrl_creds >0, 0 - otherwise.
+ *	-ENOENT if mei_cl is not present
+ *	-EINVAL if single_recv_buf == 0
+ */
+int mei_cl_flow_ctrl_creds(struct mei_cl *cl)
+{
+	struct mei_device *dev;
+	struct mei_me_client *me_cl;
+	int rets = 0;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -EINVAL;
+
+	dev = cl->dev;
+
+	if (cl->mei_flow_ctrl_creds > 0)
+		return 1;
+
+	me_cl = mei_me_cl_by_uuid_id(dev, &cl->cl_uuid, cl->me_client_id);
+	if (!me_cl) {
+		cl_err(dev, cl, "no such me client %d\n", cl->me_client_id);
+		return -ENOENT;
+	}
+
+	if (me_cl->mei_flow_ctrl_creds > 0) {
+		rets = 1;
+		if (WARN_ON(me_cl->props.single_recv_buf == 0))
+			rets = -EINVAL;
+	}
+	mei_me_cl_put(me_cl);
+	return rets;
+}
+
+/**
+ * mei_cl_flow_ctrl_reduce - reduces flow_control.
+ *
+ * @cl: private data of the file object
+ *
+ * Return:
+ *	0 on success
+ *	-ENOENT when me client is not found
+ *	-EINVAL when ctrl credits are <= 0
+ */
+int mei_cl_flow_ctrl_reduce(struct mei_cl *cl)
+{
+	struct mei_device *dev;
+	struct mei_me_client *me_cl;
+	int rets;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -EINVAL;
+
+	dev = cl->dev;
+
+	me_cl = mei_me_cl_by_uuid_id(dev, &cl->cl_uuid, cl->me_client_id);
+	if (!me_cl) {
+		cl_err(dev, cl, "no such me client %d\n", cl->me_client_id);
+		return -ENOENT;
+	}
+
+	if (me_cl->props.single_recv_buf) {
+		if (WARN_ON(me_cl->mei_flow_ctrl_creds <= 0)) {
+			rets = -EINVAL;
+			goto out;
+		}
+		me_cl->mei_flow_ctrl_creds--;
+	} else {
+		if (WARN_ON(cl->mei_flow_ctrl_creds <= 0)) {
+			rets = -EINVAL;
+			goto out;
+		}
+		cl->mei_flow_ctrl_creds--;
+	}
+	rets = 0;
+out:
+	mei_me_cl_put(me_cl);
+	return rets;
+}
+
+/**
+ * mei_cl_read_start - the start read client message function.
+ *
+ * @cl: host client
+ * @length: number of bytes to read
+ * @fp: pointer to file structure
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+int mei_cl_read_start(struct mei_cl *cl, size_t length, struct file *fp)
+{
+	struct mei_device *dev;
+	struct mei_cl_cb *cb;
+	struct mei_me_client *me_cl;
+	int rets;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	if (!mei_cl_is_connected(cl))
+		return -ENODEV;
+
+	/* HW currently supports only one pending read */
+	if (!list_empty(&cl->rd_pending))
+		return -EBUSY;
+
+	me_cl = mei_me_cl_by_uuid_id(dev, &cl->cl_uuid, cl->me_client_id);
+	if (!me_cl) {
+		cl_err(dev, cl, "no such me client %d\n", cl->me_client_id);
+		return  -ENOTTY;
+	}
+	/* always allocate at least client max message */
+	length = max_t(size_t, length, me_cl->props.max_msg_length);
+	mei_me_cl_put(me_cl);
+
+	rets = pm_runtime_get(dev->dev);
+	if (rets < 0 && rets != -EINPROGRESS) {
+		pm_runtime_put_noidle(dev->dev);
+		cl_err(dev, cl, "rpm: get failed %d\n", rets);
+		return rets;
+	}
+
+	cb = mei_cl_alloc_cb(cl, length, MEI_FOP_READ, fp);
+	rets = cb ? 0 : -ENOMEM;
+	if (rets)
+		goto out;
+
+	if (mei_hbuf_acquire(dev)) {
+		rets = mei_hbm_cl_flow_control_req(dev, cl);
+		if (rets < 0)
+			goto out;
+
+		list_add_tail(&cb->list, &cl->rd_pending);
+	} else {
+		list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
+	}
+
+out:
+	cl_dbg(dev, cl, "rpm: autosuspend\n");
+	pm_runtime_mark_last_busy(dev->dev);
+	pm_runtime_put_autosuspend(dev->dev);
+
+	if (rets)
+		mei_io_cb_free(cb);
+
+	return rets;
+}
+
+/**
+ * mei_cl_irq_write - write a message to device
+ *	from the interrupt thread context
+ *
+ * @cl: client
+ * @cb: callback block.
+ * @cmpl_list: complete list.
+ *
+ * Return: 0, OK; otherwise error.
+ */
+int mei_cl_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
+		     struct mei_cl_cb *cmpl_list)
+{
+	struct mei_device *dev;
+	struct mei_msg_data *buf;
+	struct mei_msg_hdr mei_hdr;
+	size_t len;
+	u32 msg_slots;
+	int slots;
+	int rets;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	buf = &cb->buf;
+
+	rets = mei_cl_flow_ctrl_creds(cl);
+	if (rets < 0)
+		return rets;
+
+	if (rets == 0) {
+		cl_dbg(dev, cl, "No flow control credentials: not sending.\n");
+		return 0;
+	}
+
+	slots = mei_hbuf_empty_slots(dev);
+	len = buf->size - cb->buf_idx;
+	msg_slots = mei_data2slots(len);
+
+	mei_hdr.host_addr = cl->host_client_id;
+	mei_hdr.me_addr = cl->me_client_id;
+	mei_hdr.reserved = 0;
+	mei_hdr.internal = cb->internal;
+
+	if (slots >= msg_slots) {
+		mei_hdr.length = len;
+		mei_hdr.msg_complete = 1;
+	/* Split the message only if we can write the whole host buffer */
+	} else if (slots == dev->hbuf_depth) {
+		msg_slots = slots;
+		len = (slots * sizeof(u32)) - sizeof(struct mei_msg_hdr);
+		mei_hdr.length = len;
+		mei_hdr.msg_complete = 0;
+	} else {
+		/* wait for next time the host buffer is empty */
+		return 0;
+	}
+
+	cl_dbg(dev, cl, "buf: size = %d idx = %lu\n",
+			cb->buf.size, cb->buf_idx);
+
+	rets = mei_write_message(dev, &mei_hdr, buf->data + cb->buf_idx);
+	if (rets) {
+		cl->status = rets;
+		list_move_tail(&cb->list, &cmpl_list->list);
+		return rets;
+	}
+
+	cl->status = 0;
+	cl->writing_state = MEI_WRITING;
+	cb->buf_idx += mei_hdr.length;
+	cb->completed = mei_hdr.msg_complete == 1;
+
+	if (mei_hdr.msg_complete) {
+		if (mei_cl_flow_ctrl_reduce(cl))
+			return -EIO;
+		list_move_tail(&cb->list, &dev->write_waiting_list.list);
+	}
+
+	return 0;
+}
+
+/**
+ * mei_cl_write - submit a write cb to mei device
+ *	assumes device_lock is locked
+ *
+ * @cl: host client
+ * @cb: write callback with filled data
+ * @blocking: block until completed
+ *
+ * Return: number of bytes sent on success, <0 on failure.
+ */
+int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking)
+{
+	struct mei_device *dev;
+	struct mei_msg_data *buf;
+	struct mei_msg_hdr mei_hdr;
+	int rets;
+
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	if (WARN_ON(!cb))
+		return -EINVAL;
+
+	dev = cl->dev;
+
+
+	buf = &cb->buf;
+
+	cl_dbg(dev, cl, "size=%d\n", buf->size);
+
+	rets = pm_runtime_get(dev->dev);
+	if (rets < 0 && rets != -EINPROGRESS) {
+		pm_runtime_put_noidle(dev->dev);
+		cl_err(dev, cl, "rpm: get failed %d\n", rets);
+		return rets;
+	}
+
+	cb->buf_idx = 0;
+	cl->writing_state = MEI_IDLE;
+
+	mei_hdr.host_addr = cl->host_client_id;
+	mei_hdr.me_addr = cl->me_client_id;
+	mei_hdr.reserved = 0;
+	mei_hdr.msg_complete = 0;
+	mei_hdr.internal = cb->internal;
+
+	rets = mei_cl_flow_ctrl_creds(cl);
+	if (rets < 0)
+		goto err;
+
+	if (rets == 0) {
+		cl_dbg(dev, cl, "No flow control credentials: not sending.\n");
+		rets = buf->size;
+		goto out;
+	}
+	if (!mei_hbuf_acquire(dev)) {
+		cl_dbg(dev, cl, "Cannot acquire the host buffer: not sending.\n");
+		rets = buf->size;
+		goto out;
+	}
+
+	/* Check for a maximum length */
+	if (buf->size > mei_hbuf_max_len(dev)) {
+		mei_hdr.length = mei_hbuf_max_len(dev);
+		mei_hdr.msg_complete = 0;
+	} else {
+		mei_hdr.length = buf->size;
+		mei_hdr.msg_complete = 1;
+	}
+
+	rets = mei_write_message(dev, &mei_hdr, buf->data);
+	if (rets)
+		goto err;
+
+	cl->writing_state = MEI_WRITING;
+	cb->buf_idx = mei_hdr.length;
+	cb->completed = mei_hdr.msg_complete == 1;
+
+out:
+	if (mei_hdr.msg_complete) {
+		rets = mei_cl_flow_ctrl_reduce(cl);
+		if (rets < 0)
+			goto err;
+
+		list_add_tail(&cb->list, &dev->write_waiting_list.list);
+	} else {
+		list_add_tail(&cb->list, &dev->write_list.list);
+	}
+
+
+	if (blocking && cl->writing_state != MEI_WRITE_COMPLETE) {
+
+		mutex_unlock(&dev->device_lock);
+		rets = wait_event_interruptible(cl->tx_wait,
+				cl->writing_state == MEI_WRITE_COMPLETE);
+		mutex_lock(&dev->device_lock);
+		/* wait_event_interruptible returns -ERESTARTSYS */
+		if (rets) {
+			if (signal_pending(current))
+				rets = -EINTR;
+			goto err;
+		}
+	}
+
+	rets = buf->size;
+err:
+	cl_dbg(dev, cl, "rpm: autosuspend\n");
+	pm_runtime_mark_last_busy(dev->dev);
+	pm_runtime_put_autosuspend(dev->dev);
+
+	return rets;
+}
+
+
+/**
+ * mei_cl_complete - processes completed operation for a client
+ *
+ * @cl: private data of the file object.
+ * @cb: callback block.
+ */
+void mei_cl_complete(struct mei_cl *cl, struct mei_cl_cb *cb)
+{
+	if (cb->fop_type == MEI_FOP_WRITE) {
+		mei_io_cb_free(cb);
+		cb = NULL;
+		cl->writing_state = MEI_WRITE_COMPLETE;
+		if (waitqueue_active(&cl->tx_wait))
+			wake_up_interruptible(&cl->tx_wait);
+
+	} else if (cb->fop_type == MEI_FOP_READ) {
+		list_add_tail(&cb->list, &cl->rd_completed);
+		if (waitqueue_active(&cl->rx_wait))
+			wake_up_interruptible_all(&cl->rx_wait);
+		else
+			mei_cl_bus_rx_event(cl);
+
+	}
+}
+
+
+/**
+ * mei_cl_all_disconnect - disconnect forcefully all connected clients
+ *
+ * @dev: mei device
+ */
+
+void mei_cl_all_disconnect(struct mei_device *dev)
+{
+	struct mei_cl *cl;
+
+	list_for_each_entry(cl, &dev->file_list, link) {
+		cl->state = MEI_FILE_DISCONNECTED;
+		cl->mei_flow_ctrl_creds = 0;
+		cl->timer_count = 0;
+	}
+}
+
+
+/**
+ * mei_cl_all_wakeup  - wake up all readers and writers they can be interrupted
+ *
+ * @dev: mei device
+ */
+void mei_cl_all_wakeup(struct mei_device *dev)
+{
+	struct mei_cl *cl;
+
+	list_for_each_entry(cl, &dev->file_list, link) {
+		if (waitqueue_active(&cl->rx_wait)) {
+			cl_dbg(dev, cl, "Waking up reading client!\n");
+			wake_up_interruptible(&cl->rx_wait);
+		}
+		if (waitqueue_active(&cl->tx_wait)) {
+			cl_dbg(dev, cl, "Waking up writing client!\n");
+			wake_up_interruptible(&cl->tx_wait);
+		}
+	}
+}
+
+/**
+ * mei_cl_all_write_clear - clear all pending writes
+ *
+ * @dev: mei device
+ */
+void mei_cl_all_write_clear(struct mei_device *dev)
+{
+	mei_io_list_free(&dev->write_list, NULL);
+	mei_io_list_free(&dev->write_waiting_list, NULL);
+}
+
+
diff --git a/drivers/misc/mei/client.h b/drivers/misc/mei/client.h
new file mode 100644
index 000000000..0a39e5d45
--- /dev/null
+++ b/drivers/misc/mei/client.h
@@ -0,0 +1,135 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2003-2012, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#ifndef _MEI_CLIENT_H_
+#define _MEI_CLIENT_H_
+
+#include <linux/types.h>
+#include <linux/watchdog.h>
+#include <linux/poll.h>
+#include <linux/mei.h>
+
+#include "mei_dev.h"
+
+/*
+ * reference counting base function
+ */
+void mei_me_cl_init(struct mei_me_client *me_cl);
+void mei_me_cl_put(struct mei_me_client *me_cl);
+struct mei_me_client *mei_me_cl_get(struct mei_me_client *me_cl);
+
+void mei_me_cl_add(struct mei_device *dev, struct mei_me_client *me_cl);
+void mei_me_cl_del(struct mei_device *dev, struct mei_me_client *me_cl);
+
+struct mei_me_client *mei_me_cl_by_uuid(struct mei_device *dev,
+					const uuid_le *uuid);
+struct mei_me_client *mei_me_cl_by_id(struct mei_device *dev, u8 client_id);
+struct mei_me_client *mei_me_cl_by_uuid_id(struct mei_device *dev,
+					   const uuid_le *uuid, u8 client_id);
+void mei_me_cl_rm_by_uuid(struct mei_device *dev, const uuid_le *uuid);
+void mei_me_cl_rm_by_uuid_id(struct mei_device *dev,
+			     const uuid_le *uuid, u8 id);
+void mei_me_cl_rm_all(struct mei_device *dev);
+
+/*
+ * MEI IO Functions
+ */
+struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl, enum mei_cb_file_ops type,
+				 struct file *fp);
+void mei_io_cb_free(struct mei_cl_cb *priv_cb);
+int mei_io_cb_alloc_buf(struct mei_cl_cb *cb, size_t length);
+
+
+/**
+ * mei_io_list_init - Sets up a queue list.
+ *
+ * @list: An instance cl callback structure
+ */
+static inline void mei_io_list_init(struct mei_cl_cb *list)
+{
+	INIT_LIST_HEAD(&list->list);
+}
+void mei_io_list_flush(struct mei_cl_cb *list, struct mei_cl *cl);
+
+/*
+ * MEI Host Client Functions
+ */
+
+struct mei_cl *mei_cl_allocate(struct mei_device *dev);
+void mei_cl_init(struct mei_cl *cl, struct mei_device *dev);
+
+
+int mei_cl_link(struct mei_cl *cl, int id);
+int mei_cl_unlink(struct mei_cl *cl);
+
+struct mei_cl *mei_cl_alloc_linked(struct mei_device *dev, int id);
+
+struct mei_cl_cb *mei_cl_read_cb(const struct mei_cl *cl,
+				 const struct file *fp);
+void mei_cl_read_cb_flush(const struct mei_cl *cl, const struct file *fp);
+struct mei_cl_cb *mei_cl_alloc_cb(struct mei_cl *cl, size_t length,
+				  enum mei_cb_file_ops type, struct file *fp);
+int mei_cl_flush_queues(struct mei_cl *cl, const struct file *fp);
+
+int mei_cl_flow_ctrl_creds(struct mei_cl *cl);
+
+int mei_cl_flow_ctrl_reduce(struct mei_cl *cl);
+/*
+ *  MEI input output function prototype
+ */
+
+/**
+ * mei_cl_is_connected - host client is connected
+ *
+ * @cl: host clinet
+ *
+ * Return: true if the host clinet is connected
+ */
+static inline bool mei_cl_is_connected(struct mei_cl *cl)
+{
+	return  cl->state == MEI_FILE_CONNECTED;
+}
+
+bool mei_cl_is_other_connecting(struct mei_cl *cl);
+int mei_cl_disconnect(struct mei_cl *cl);
+int mei_cl_connect(struct mei_cl *cl, struct file *file);
+int mei_cl_read_start(struct mei_cl *cl, size_t length, struct file *fp);
+int mei_cl_irq_read_msg(struct mei_cl *cl, struct mei_msg_hdr *hdr,
+			struct mei_cl_cb *cmpl_list);
+int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking);
+int mei_cl_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
+		     struct mei_cl_cb *cmpl_list);
+
+void mei_cl_complete(struct mei_cl *cl, struct mei_cl_cb *cb);
+
+void mei_host_client_init(struct work_struct *work);
+
+
+
+void mei_cl_all_disconnect(struct mei_device *dev);
+void mei_cl_all_wakeup(struct mei_device *dev);
+void mei_cl_all_write_clear(struct mei_device *dev);
+
+#define MEI_CL_FMT "cl:host=%02d me=%02d "
+#define MEI_CL_PRM(cl) (cl)->host_client_id, (cl)->me_client_id
+
+#define cl_dbg(dev, cl, format, arg...) \
+	dev_dbg((dev)->dev, MEI_CL_FMT format, MEI_CL_PRM(cl), ##arg)
+
+#define cl_err(dev, cl, format, arg...) \
+	dev_err((dev)->dev, MEI_CL_FMT format, MEI_CL_PRM(cl), ##arg)
+
+#endif /* _MEI_CLIENT_H_ */
diff --git a/drivers/misc/mei/debugfs.c b/drivers/misc/mei/debugfs.c
new file mode 100644
index 000000000..d9cd7e6ee
--- /dev/null
+++ b/drivers/misc/mei/debugfs.c
@@ -0,0 +1,218 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2012-2013, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/debugfs.h>
+
+#include <linux/mei.h>
+
+#include "mei_dev.h"
+#include "client.h"
+#include "hw.h"
+
+static ssize_t mei_dbgfs_read_meclients(struct file *fp, char __user *ubuf,
+					size_t cnt, loff_t *ppos)
+{
+	struct mei_device *dev = fp->private_data;
+	struct mei_me_client *me_cl;
+	size_t bufsz = 1;
+	char *buf;
+	int i = 0;
+	int pos = 0;
+	int ret;
+
+#define HDR \
+"  |id|fix|         UUID                       |con|msg len|sb|refc|\n"
+
+	down_read(&dev->me_clients_rwsem);
+	list_for_each_entry(me_cl, &dev->me_clients, list)
+		bufsz++;
+
+	bufsz *= sizeof(HDR) + 1;
+	buf = kzalloc(bufsz, GFP_KERNEL);
+	if (!buf) {
+		up_read(&dev->me_clients_rwsem);
+		return -ENOMEM;
+	}
+
+	pos += scnprintf(buf + pos, bufsz - pos, HDR);
+
+	/*  if the driver is not enabled the list won't be consistent */
+	if (dev->dev_state != MEI_DEV_ENABLED)
+		goto out;
+
+	list_for_each_entry(me_cl, &dev->me_clients, list) {
+
+		if (mei_me_cl_get(me_cl)) {
+			pos += scnprintf(buf + pos, bufsz - pos,
+				"%2d|%2d|%3d|%pUl|%3d|%7d|%2d|%4d|\n",
+				i++, me_cl->client_id,
+				me_cl->props.fixed_address,
+				&me_cl->props.protocol_name,
+				me_cl->props.max_number_of_connections,
+				me_cl->props.max_msg_length,
+				me_cl->props.single_recv_buf,
+				atomic_read(&me_cl->refcnt.refcount));
+
+			mei_me_cl_put(me_cl);
+		}
+	}
+
+out:
+	up_read(&dev->me_clients_rwsem);
+	ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);
+	kfree(buf);
+	return ret;
+}
+
+static const struct file_operations mei_dbgfs_fops_meclients = {
+	.open = simple_open,
+	.read = mei_dbgfs_read_meclients,
+	.llseek = generic_file_llseek,
+};
+
+static ssize_t mei_dbgfs_read_active(struct file *fp, char __user *ubuf,
+					size_t cnt, loff_t *ppos)
+{
+	struct mei_device *dev = fp->private_data;
+	struct mei_cl *cl;
+	const size_t bufsz = 1024;
+	char *buf;
+	int i = 0;
+	int pos = 0;
+	int ret;
+
+	if (!dev)
+		return -ENODEV;
+
+	buf = kzalloc(bufsz, GFP_KERNEL);
+	if  (!buf)
+		return -ENOMEM;
+
+	pos += scnprintf(buf + pos, bufsz - pos,
+			"  |me|host|state|rd|wr|\n");
+
+	mutex_lock(&dev->device_lock);
+
+	/*  if the driver is not enabled the list won't be consistent */
+	if (dev->dev_state != MEI_DEV_ENABLED)
+		goto out;
+
+	list_for_each_entry(cl, &dev->file_list, link) {
+
+		pos += scnprintf(buf + pos, bufsz - pos,
+			"%2d|%2d|%4d|%5d|%2d|%2d|\n",
+			i, cl->me_client_id, cl->host_client_id, cl->state,
+			!list_empty(&cl->rd_completed), cl->writing_state);
+		i++;
+	}
+out:
+	mutex_unlock(&dev->device_lock);
+	ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);
+	kfree(buf);
+	return ret;
+}
+
+static const struct file_operations mei_dbgfs_fops_active = {
+	.open = simple_open,
+	.read = mei_dbgfs_read_active,
+	.llseek = generic_file_llseek,
+};
+
+static ssize_t mei_dbgfs_read_devstate(struct file *fp, char __user *ubuf,
+					size_t cnt, loff_t *ppos)
+{
+	struct mei_device *dev = fp->private_data;
+	const size_t bufsz = 1024;
+	char *buf = kzalloc(bufsz, GFP_KERNEL);
+	int pos = 0;
+	int ret;
+
+	if  (!buf)
+		return -ENOMEM;
+
+	pos += scnprintf(buf + pos, bufsz - pos, "dev: %s\n",
+			mei_dev_state_str(dev->dev_state));
+	pos += scnprintf(buf + pos, bufsz - pos, "hbm: %s\n",
+			mei_hbm_state_str(dev->hbm_state));
+	pos += scnprintf(buf + pos, bufsz - pos, "pg:  %s, %s\n",
+			mei_pg_is_enabled(dev) ? "ENABLED" : "DISABLED",
+			mei_pg_state_str(mei_pg_state(dev)));
+	ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);
+	kfree(buf);
+	return ret;
+}
+static const struct file_operations mei_dbgfs_fops_devstate = {
+	.open = simple_open,
+	.read = mei_dbgfs_read_devstate,
+	.llseek = generic_file_llseek,
+};
+
+/**
+ * mei_dbgfs_deregister - Remove the debugfs files and directories
+ *
+ * @dev: the mei device structure
+ */
+void mei_dbgfs_deregister(struct mei_device *dev)
+{
+	if (!dev->dbgfs_dir)
+		return;
+	debugfs_remove_recursive(dev->dbgfs_dir);
+	dev->dbgfs_dir = NULL;
+}
+
+/**
+ * mei_dbgfs_register - Add the debugfs files
+ *
+ * @dev: the mei device structure
+ * @name: the mei device name
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+int mei_dbgfs_register(struct mei_device *dev, const char *name)
+{
+	struct dentry *dir, *f;
+
+	dir = debugfs_create_dir(name, NULL);
+	if (!dir)
+		return -ENOMEM;
+
+	f = debugfs_create_file("meclients", S_IRUSR, dir,
+				dev, &mei_dbgfs_fops_meclients);
+	if (!f) {
+		dev_err(dev->dev, "meclients: registration failed\n");
+		goto err;
+	}
+	f = debugfs_create_file("active", S_IRUSR, dir,
+				dev, &mei_dbgfs_fops_active);
+	if (!f) {
+		dev_err(dev->dev, "meclients: registration failed\n");
+		goto err;
+	}
+	f = debugfs_create_file("devstate", S_IRUSR, dir,
+				dev, &mei_dbgfs_fops_devstate);
+	if (!f) {
+		dev_err(dev->dev, "devstate: registration failed\n");
+		goto err;
+	}
+	dev->dbgfs_dir = dir;
+	return 0;
+err:
+	mei_dbgfs_deregister(dev);
+	return -ENODEV;
+}
+
diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c
new file mode 100644
index 000000000..58da92565
--- /dev/null
+++ b/drivers/misc/mei/hbm.c
@@ -0,0 +1,947 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2003-2012, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#include <linux/export.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+
+#include <linux/mei.h>
+
+#include "mei_dev.h"
+#include "hbm.h"
+#include "client.h"
+
+static const char *mei_hbm_status_str(enum mei_hbm_status status)
+{
+#define MEI_HBM_STATUS(status) case MEI_HBMS_##status: return #status
+	switch (status) {
+	MEI_HBM_STATUS(SUCCESS);
+	MEI_HBM_STATUS(CLIENT_NOT_FOUND);
+	MEI_HBM_STATUS(ALREADY_EXISTS);
+	MEI_HBM_STATUS(REJECTED);
+	MEI_HBM_STATUS(INVALID_PARAMETER);
+	MEI_HBM_STATUS(NOT_ALLOWED);
+	MEI_HBM_STATUS(ALREADY_STARTED);
+	MEI_HBM_STATUS(NOT_STARTED);
+	default: return "unknown";
+	}
+#undef MEI_HBM_STATUS
+};
+
+static const char *mei_cl_conn_status_str(enum mei_cl_connect_status status)
+{
+#define MEI_CL_CS(status) case MEI_CL_CONN_##status: return #status
+	switch (status) {
+	MEI_CL_CS(SUCCESS);
+	MEI_CL_CS(NOT_FOUND);
+	MEI_CL_CS(ALREADY_STARTED);
+	MEI_CL_CS(OUT_OF_RESOURCES);
+	MEI_CL_CS(MESSAGE_SMALL);
+	default: return "unknown";
+	}
+#undef MEI_CL_CCS
+}
+
+const char *mei_hbm_state_str(enum mei_hbm_state state)
+{
+#define MEI_HBM_STATE(state) case MEI_HBM_##state: return #state
+	switch (state) {
+	MEI_HBM_STATE(IDLE);
+	MEI_HBM_STATE(STARTING);
+	MEI_HBM_STATE(STARTED);
+	MEI_HBM_STATE(ENUM_CLIENTS);
+	MEI_HBM_STATE(CLIENT_PROPERTIES);
+	MEI_HBM_STATE(STOPPED);
+	default:
+		return "unknown";
+	}
+#undef MEI_HBM_STATE
+}
+
+/**
+ * mei_cl_conn_status_to_errno - convert client connect response
+ * status to error code
+ *
+ * @status: client connect response status
+ *
+ * Return: corresponding error code
+ */
+static int mei_cl_conn_status_to_errno(enum mei_cl_connect_status status)
+{
+	switch (status) {
+	case MEI_CL_CONN_SUCCESS:          return 0;
+	case MEI_CL_CONN_NOT_FOUND:        return -ENOTTY;
+	case MEI_CL_CONN_ALREADY_STARTED:  return -EBUSY;
+	case MEI_CL_CONN_OUT_OF_RESOURCES: return -EBUSY;
+	case MEI_CL_CONN_MESSAGE_SMALL:    return -EINVAL;
+	default:                           return -EINVAL;
+	}
+}
+
+/**
+ * mei_hbm_idle - set hbm to idle state
+ *
+ * @dev: the device structure
+ */
+void mei_hbm_idle(struct mei_device *dev)
+{
+	dev->init_clients_timer = 0;
+	dev->hbm_state = MEI_HBM_IDLE;
+}
+
+/**
+ * mei_hbm_reset - reset hbm counters and book keeping data structurs
+ *
+ * @dev: the device structure
+ */
+void mei_hbm_reset(struct mei_device *dev)
+{
+	dev->me_client_index = 0;
+
+	mei_me_cl_rm_all(dev);
+
+	mei_hbm_idle(dev);
+}
+
+/**
+ * mei_hbm_hdr - construct hbm header
+ *
+ * @hdr: hbm header
+ * @length: payload length
+ */
+
+static inline void mei_hbm_hdr(struct mei_msg_hdr *hdr, size_t length)
+{
+	hdr->host_addr = 0;
+	hdr->me_addr = 0;
+	hdr->length = length;
+	hdr->msg_complete = 1;
+	hdr->reserved = 0;
+}
+
+/**
+ * mei_hbm_cl_hdr - construct client hbm header
+ *
+ * @cl: client
+ * @hbm_cmd: host bus message command
+ * @buf: buffer for cl header
+ * @len: buffer length
+ */
+static inline
+void mei_hbm_cl_hdr(struct mei_cl *cl, u8 hbm_cmd, void *buf, size_t len)
+{
+	struct mei_hbm_cl_cmd *cmd = buf;
+
+	memset(cmd, 0, len);
+
+	cmd->hbm_cmd = hbm_cmd;
+	cmd->host_addr = cl->host_client_id;
+	cmd->me_addr = cl->me_client_id;
+}
+
+/**
+ * mei_hbm_cl_write - write simple hbm client message
+ *
+ * @dev: the device structure
+ * @cl: client
+ * @hbm_cmd: host bus message command
+ * @len: buffer length
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+static inline
+int mei_hbm_cl_write(struct mei_device *dev,
+		     struct mei_cl *cl, u8 hbm_cmd, size_t len)
+{
+	struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
+
+	mei_hbm_hdr(mei_hdr, len);
+	mei_hbm_cl_hdr(cl, hbm_cmd, dev->wr_msg.data, len);
+
+	return mei_write_message(dev, mei_hdr, dev->wr_msg.data);
+}
+
+/**
+ * mei_hbm_cl_addr_equal - check if the client's and
+ *	the message address match
+ *
+ * @cl: client
+ * @cmd: hbm client message
+ *
+ * Return: true if addresses are the same
+ */
+static inline
+bool mei_hbm_cl_addr_equal(struct mei_cl *cl, struct mei_hbm_cl_cmd *cmd)
+{
+	return cl->host_client_id == cmd->host_addr &&
+		cl->me_client_id == cmd->me_addr;
+}
+
+/**
+ * mei_hbm_cl_find_by_cmd - find recipient client
+ *
+ * @dev: the device structure
+ * @buf: a buffer with hbm cl command
+ *
+ * Return: the recipient client or NULL if not found
+ */
+static inline
+struct mei_cl *mei_hbm_cl_find_by_cmd(struct mei_device *dev, void *buf)
+{
+	struct mei_hbm_cl_cmd *cmd = (struct mei_hbm_cl_cmd *)buf;
+	struct mei_cl *cl;
+
+	list_for_each_entry(cl, &dev->file_list, link)
+		if (mei_hbm_cl_addr_equal(cl, cmd))
+			return cl;
+	return NULL;
+}
+
+
+/**
+ * mei_hbm_start_wait - wait for start response message.
+ *
+ * @dev: the device structure
+ *
+ * Return: 0 on success and < 0 on failure
+ */
+int mei_hbm_start_wait(struct mei_device *dev)
+{
+	int ret;
+
+	if (dev->hbm_state > MEI_HBM_STARTING)
+		return 0;
+
+	mutex_unlock(&dev->device_lock);
+	ret = wait_event_timeout(dev->wait_hbm_start,
+			dev->hbm_state != MEI_HBM_STARTING,
+			mei_secs_to_jiffies(MEI_HBM_TIMEOUT));
+	mutex_lock(&dev->device_lock);
+
+	if (ret == 0 && (dev->hbm_state <= MEI_HBM_STARTING)) {
+		dev->hbm_state = MEI_HBM_IDLE;
+		dev_err(dev->dev, "waiting for mei start failed\n");
+		return -ETIME;
+	}
+	return 0;
+}
+
+/**
+ * mei_hbm_start_req - sends start request message.
+ *
+ * @dev: the device structure
+ *
+ * Return: 0 on success and < 0 on failure
+ */
+int mei_hbm_start_req(struct mei_device *dev)
+{
+	struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
+	struct hbm_host_version_request *start_req;
+	const size_t len = sizeof(struct hbm_host_version_request);
+	int ret;
+
+	mei_hbm_reset(dev);
+
+	mei_hbm_hdr(mei_hdr, len);
+
+	/* host start message */
+	start_req = (struct hbm_host_version_request *)dev->wr_msg.data;
+	memset(start_req, 0, len);
+	start_req->hbm_cmd = HOST_START_REQ_CMD;
+	start_req->host_version.major_version = HBM_MAJOR_VERSION;
+	start_req->host_version.minor_version = HBM_MINOR_VERSION;
+
+	dev->hbm_state = MEI_HBM_IDLE;
+	ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
+	if (ret) {
+		dev_err(dev->dev, "version message write failed: ret = %d\n",
+			ret);
+		return ret;
+	}
+
+	dev->hbm_state = MEI_HBM_STARTING;
+	dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
+	return 0;
+}
+
+/*
+ * mei_hbm_enum_clients_req - sends enumeration client request message.
+ *
+ * @dev: the device structure
+ *
+ * Return: 0 on success and < 0 on failure
+ */
+static int mei_hbm_enum_clients_req(struct mei_device *dev)
+{
+	struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
+	struct hbm_host_enum_request *enum_req;
+	const size_t len = sizeof(struct hbm_host_enum_request);
+	int ret;
+
+	/* enumerate clients */
+	mei_hbm_hdr(mei_hdr, len);
+
+	enum_req = (struct hbm_host_enum_request *)dev->wr_msg.data;
+	memset(enum_req, 0, len);
+	enum_req->hbm_cmd = HOST_ENUM_REQ_CMD;
+
+	ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
+	if (ret) {
+		dev_err(dev->dev, "enumeration request write failed: ret = %d.\n",
+			ret);
+		return ret;
+	}
+	dev->hbm_state = MEI_HBM_ENUM_CLIENTS;
+	dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
+	return 0;
+}
+
+/*
+ * mei_hbm_me_cl_add - add new me client to the list
+ *
+ * @dev: the device structure
+ * @res: hbm property response
+ *
+ * Return: 0 on success and -ENOMEM on allocation failure
+ */
+
+static int mei_hbm_me_cl_add(struct mei_device *dev,
+			     struct hbm_props_response *res)
+{
+	struct mei_me_client *me_cl;
+	const uuid_le *uuid = &res->client_properties.protocol_name;
+
+	mei_me_cl_rm_by_uuid(dev, uuid);
+
+	me_cl = kzalloc(sizeof(struct mei_me_client), GFP_KERNEL);
+	if (!me_cl)
+		return -ENOMEM;
+
+	mei_me_cl_init(me_cl);
+
+	me_cl->props = res->client_properties;
+	me_cl->client_id = res->me_addr;
+	me_cl->mei_flow_ctrl_creds = 0;
+
+	mei_me_cl_add(dev, me_cl);
+
+	return 0;
+}
+
+/**
+ * mei_hbm_prop_req - request property for a single client
+ *
+ * @dev: the device structure
+ *
+ * Return: 0 on success and < 0 on failure
+ */
+
+static int mei_hbm_prop_req(struct mei_device *dev)
+{
+
+	struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
+	struct hbm_props_request *prop_req;
+	const size_t len = sizeof(struct hbm_props_request);
+	unsigned long next_client_index;
+	int ret;
+
+	next_client_index = find_next_bit(dev->me_clients_map, MEI_CLIENTS_MAX,
+					  dev->me_client_index);
+
+	/* We got all client properties */
+	if (next_client_index == MEI_CLIENTS_MAX) {
+		dev->hbm_state = MEI_HBM_STARTED;
+		schedule_work(&dev->init_work);
+
+		return 0;
+	}
+
+	mei_hbm_hdr(mei_hdr, len);
+	prop_req = (struct hbm_props_request *)dev->wr_msg.data;
+
+	memset(prop_req, 0, sizeof(struct hbm_props_request));
+
+	prop_req->hbm_cmd = HOST_CLIENT_PROPERTIES_REQ_CMD;
+	prop_req->me_addr = next_client_index;
+
+	ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
+	if (ret) {
+		dev_err(dev->dev, "properties request write failed: ret = %d\n",
+			ret);
+		return ret;
+	}
+
+	dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
+	dev->me_client_index = next_client_index;
+
+	return 0;
+}
+
+/*
+ * mei_hbm_pg - sends pg command
+ *
+ * @dev: the device structure
+ * @pg_cmd: the pg command code
+ *
+ * Return: -EIO on write failure
+ *         -EOPNOTSUPP if the operation is not supported by the protocol
+ */
+int mei_hbm_pg(struct mei_device *dev, u8 pg_cmd)
+{
+	struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
+	struct hbm_power_gate *req;
+	const size_t len = sizeof(struct hbm_power_gate);
+	int ret;
+
+	if (!dev->hbm_f_pg_supported)
+		return -EOPNOTSUPP;
+
+	mei_hbm_hdr(mei_hdr, len);
+
+	req = (struct hbm_power_gate *)dev->wr_msg.data;
+	memset(req, 0, len);
+	req->hbm_cmd = pg_cmd;
+
+	ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
+	if (ret)
+		dev_err(dev->dev, "power gate command write failed.\n");
+	return ret;
+}
+EXPORT_SYMBOL_GPL(mei_hbm_pg);
+
+/**
+ * mei_hbm_stop_req - send stop request message
+ *
+ * @dev: mei device
+ *
+ * Return: -EIO on write failure
+ */
+static int mei_hbm_stop_req(struct mei_device *dev)
+{
+	struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
+	struct hbm_host_stop_request *req =
+			(struct hbm_host_stop_request *)dev->wr_msg.data;
+	const size_t len = sizeof(struct hbm_host_stop_request);
+
+	mei_hbm_hdr(mei_hdr, len);
+
+	memset(req, 0, len);
+	req->hbm_cmd = HOST_STOP_REQ_CMD;
+	req->reason = DRIVER_STOP_REQUEST;
+
+	return mei_write_message(dev, mei_hdr, dev->wr_msg.data);
+}
+
+/**
+ * mei_hbm_cl_flow_control_req - sends flow control request.
+ *
+ * @dev: the device structure
+ * @cl: client info
+ *
+ * Return: -EIO on write failure
+ */
+int mei_hbm_cl_flow_control_req(struct mei_device *dev, struct mei_cl *cl)
+{
+	const size_t len = sizeof(struct hbm_flow_control);
+
+	cl_dbg(dev, cl, "sending flow control\n");
+	return mei_hbm_cl_write(dev, cl, MEI_FLOW_CONTROL_CMD, len);
+}
+
+/**
+ * mei_hbm_add_single_flow_creds - adds single buffer credentials.
+ *
+ * @dev: the device structure
+ * @flow: flow control.
+ *
+ * Return: 0 on success, < 0 otherwise
+ */
+static int mei_hbm_add_single_flow_creds(struct mei_device *dev,
+				  struct hbm_flow_control *flow)
+{
+	struct mei_me_client *me_cl;
+	int rets;
+
+	me_cl = mei_me_cl_by_id(dev, flow->me_addr);
+	if (!me_cl) {
+		dev_err(dev->dev, "no such me client %d\n",
+			flow->me_addr);
+		return -ENOENT;
+	}
+
+	if (WARN_ON(me_cl->props.single_recv_buf == 0)) {
+		rets = -EINVAL;
+		goto out;
+	}
+
+	me_cl->mei_flow_ctrl_creds++;
+	dev_dbg(dev->dev, "recv flow ctrl msg ME %d (single) creds = %d.\n",
+	    flow->me_addr, me_cl->mei_flow_ctrl_creds);
+
+	rets = 0;
+out:
+	mei_me_cl_put(me_cl);
+	return rets;
+}
+
+/**
+ * mei_hbm_cl_flow_control_res - flow control response from me
+ *
+ * @dev: the device structure
+ * @flow_control: flow control response bus message
+ */
+static void mei_hbm_cl_flow_control_res(struct mei_device *dev,
+					struct hbm_flow_control *flow_control)
+{
+	struct mei_cl *cl;
+
+	if (!flow_control->host_addr) {
+		/* single receive buffer */
+		mei_hbm_add_single_flow_creds(dev, flow_control);
+		return;
+	}
+
+	cl = mei_hbm_cl_find_by_cmd(dev, flow_control);
+	if (cl) {
+		cl->mei_flow_ctrl_creds++;
+		cl_dbg(dev, cl, "flow control creds = %d.\n",
+				cl->mei_flow_ctrl_creds);
+	}
+}
+
+
+/**
+ * mei_hbm_cl_disconnect_req - sends disconnect message to fw.
+ *
+ * @dev: the device structure
+ * @cl: a client to disconnect from
+ *
+ * Return: -EIO on write failure
+ */
+int mei_hbm_cl_disconnect_req(struct mei_device *dev, struct mei_cl *cl)
+{
+	const size_t len = sizeof(struct hbm_client_connect_request);
+
+	return mei_hbm_cl_write(dev, cl, CLIENT_DISCONNECT_REQ_CMD, len);
+}
+
+/**
+ * mei_hbm_cl_disconnect_rsp - sends disconnect respose to the FW
+ *
+ * @dev: the device structure
+ * @cl: a client to disconnect from
+ *
+ * Return: -EIO on write failure
+ */
+int mei_hbm_cl_disconnect_rsp(struct mei_device *dev, struct mei_cl *cl)
+{
+	const size_t len = sizeof(struct hbm_client_connect_response);
+
+	return mei_hbm_cl_write(dev, cl, CLIENT_DISCONNECT_RES_CMD, len);
+}
+
+/**
+ * mei_hbm_cl_disconnect_res - update the client state according
+ *       disconnect response
+ *
+ * @dev: the device structure
+ * @cl: mei host client
+ * @cmd: disconnect client response host bus message
+ */
+static void mei_hbm_cl_disconnect_res(struct mei_device *dev, struct mei_cl *cl,
+				      struct mei_hbm_cl_cmd *cmd)
+{
+	struct hbm_client_connect_response *rs =
+		(struct hbm_client_connect_response *)cmd;
+
+	cl_dbg(dev, cl, "hbm: disconnect response status=%d\n", rs->status);
+
+	if (rs->status == MEI_CL_DISCONN_SUCCESS)
+		cl->state = MEI_FILE_DISCONNECTED;
+	cl->status = 0;
+}
+
+/**
+ * mei_hbm_cl_connect_req - send connection request to specific me client
+ *
+ * @dev: the device structure
+ * @cl: a client to connect to
+ *
+ * Return: -EIO on write failure
+ */
+int mei_hbm_cl_connect_req(struct mei_device *dev, struct mei_cl *cl)
+{
+	const size_t len = sizeof(struct hbm_client_connect_request);
+
+	return mei_hbm_cl_write(dev, cl, CLIENT_CONNECT_REQ_CMD, len);
+}
+
+/**
+ * mei_hbm_cl_connect_res - update the client state according
+ *        connection response
+ *
+ * @dev: the device structure
+ * @cl: mei host client
+ * @cmd: connect client response host bus message
+ */
+static void mei_hbm_cl_connect_res(struct mei_device *dev, struct mei_cl *cl,
+				   struct mei_hbm_cl_cmd *cmd)
+{
+	struct hbm_client_connect_response *rs =
+		(struct hbm_client_connect_response *)cmd;
+
+	cl_dbg(dev, cl, "hbm: connect response status=%s\n",
+			mei_cl_conn_status_str(rs->status));
+
+	if (rs->status == MEI_CL_CONN_SUCCESS)
+		cl->state = MEI_FILE_CONNECTED;
+	else
+		cl->state = MEI_FILE_DISCONNECTED;
+	cl->status = mei_cl_conn_status_to_errno(rs->status);
+}
+
+/**
+ * mei_hbm_cl_res - process hbm response received on behalf
+ *         an client
+ *
+ * @dev: the device structure
+ * @rs:  hbm client message
+ * @fop_type: file operation type
+ */
+static void mei_hbm_cl_res(struct mei_device *dev,
+			   struct mei_hbm_cl_cmd *rs,
+			   enum mei_cb_file_ops fop_type)
+{
+	struct mei_cl *cl;
+	struct mei_cl_cb *cb, *next;
+
+	cl = NULL;
+	list_for_each_entry_safe(cb, next, &dev->ctrl_rd_list.list, list) {
+
+		cl = cb->cl;
+
+		if (cb->fop_type != fop_type)
+			continue;
+
+		if (mei_hbm_cl_addr_equal(cl, rs)) {
+			list_del_init(&cb->list);
+			break;
+		}
+	}
+
+	if (!cl)
+		return;
+
+	switch (fop_type) {
+	case MEI_FOP_CONNECT:
+		mei_hbm_cl_connect_res(dev, cl, rs);
+		break;
+	case MEI_FOP_DISCONNECT:
+		mei_hbm_cl_disconnect_res(dev, cl, rs);
+		break;
+	default:
+		return;
+	}
+
+	cl->timer_count = 0;
+	wake_up(&cl->wait);
+}
+
+
+/**
+ * mei_hbm_fw_disconnect_req - disconnect request initiated by ME firmware
+ *  host sends disconnect response
+ *
+ * @dev: the device structure.
+ * @disconnect_req: disconnect request bus message from the me
+ *
+ * Return: -ENOMEM on allocation failure
+ */
+static int mei_hbm_fw_disconnect_req(struct mei_device *dev,
+		struct hbm_client_connect_request *disconnect_req)
+{
+	struct mei_cl *cl;
+	struct mei_cl_cb *cb;
+
+	cl = mei_hbm_cl_find_by_cmd(dev, disconnect_req);
+	if (cl) {
+		cl_dbg(dev, cl, "disconnect request received\n");
+		cl->state = MEI_FILE_DISCONNECTED;
+		cl->timer_count = 0;
+
+		cb = mei_io_cb_init(cl, MEI_FOP_DISCONNECT_RSP, NULL);
+		if (!cb)
+			return -ENOMEM;
+		cl_dbg(dev, cl, "add disconnect response as first\n");
+		list_add(&cb->list, &dev->ctrl_wr_list.list);
+	}
+	return 0;
+}
+
+/**
+ * mei_hbm_config_features - check what hbm features and commands
+ *        are supported by the fw
+ *
+ * @dev: the device structure
+ */
+static void mei_hbm_config_features(struct mei_device *dev)
+{
+	/* Power Gating Isolation Support */
+	dev->hbm_f_pg_supported = 0;
+	if (dev->version.major_version > HBM_MAJOR_VERSION_PGI)
+		dev->hbm_f_pg_supported = 1;
+
+	if (dev->version.major_version == HBM_MAJOR_VERSION_PGI &&
+	    dev->version.minor_version >= HBM_MINOR_VERSION_PGI)
+		dev->hbm_f_pg_supported = 1;
+}
+
+/**
+ * mei_hbm_version_is_supported - checks whether the driver can
+ *     support the hbm version of the device
+ *
+ * @dev: the device structure
+ * Return: true if driver can support hbm version of the device
+ */
+bool mei_hbm_version_is_supported(struct mei_device *dev)
+{
+	return	(dev->version.major_version < HBM_MAJOR_VERSION) ||
+		(dev->version.major_version == HBM_MAJOR_VERSION &&
+		 dev->version.minor_version <= HBM_MINOR_VERSION);
+}
+
+/**
+ * mei_hbm_dispatch - bottom half read routine after ISR to
+ * handle the read bus message cmd processing.
+ *
+ * @dev: the device structure
+ * @hdr: header of bus message
+ *
+ * Return: 0 on success and < 0 on failure
+ */
+int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
+{
+	struct mei_bus_message *mei_msg;
+	struct hbm_host_version_response *version_res;
+	struct hbm_props_response *props_res;
+	struct hbm_host_enum_response *enum_res;
+
+	struct mei_hbm_cl_cmd *cl_cmd;
+	struct hbm_client_connect_request *disconnect_req;
+	struct hbm_flow_control *flow_control;
+
+	/* read the message to our buffer */
+	BUG_ON(hdr->length >= sizeof(dev->rd_msg_buf));
+	mei_read_slots(dev, dev->rd_msg_buf, hdr->length);
+	mei_msg = (struct mei_bus_message *)dev->rd_msg_buf;
+	cl_cmd  = (struct mei_hbm_cl_cmd *)mei_msg;
+
+	/* ignore spurious message and prevent reset nesting
+	 * hbm is put to idle during system reset
+	 */
+	if (dev->hbm_state == MEI_HBM_IDLE) {
+		dev_dbg(dev->dev, "hbm: state is idle ignore spurious messages\n");
+		return 0;
+	}
+
+	switch (mei_msg->hbm_cmd) {
+	case HOST_START_RES_CMD:
+		dev_dbg(dev->dev, "hbm: start: response message received.\n");
+
+		dev->init_clients_timer = 0;
+
+		version_res = (struct hbm_host_version_response *)mei_msg;
+
+		dev_dbg(dev->dev, "HBM VERSION: DRIVER=%02d:%02d DEVICE=%02d:%02d\n",
+				HBM_MAJOR_VERSION, HBM_MINOR_VERSION,
+				version_res->me_max_version.major_version,
+				version_res->me_max_version.minor_version);
+
+		if (version_res->host_version_supported) {
+			dev->version.major_version = HBM_MAJOR_VERSION;
+			dev->version.minor_version = HBM_MINOR_VERSION;
+		} else {
+			dev->version.major_version =
+				version_res->me_max_version.major_version;
+			dev->version.minor_version =
+				version_res->me_max_version.minor_version;
+		}
+
+		if (!mei_hbm_version_is_supported(dev)) {
+			dev_warn(dev->dev, "hbm: start: version mismatch - stopping the driver.\n");
+
+			dev->hbm_state = MEI_HBM_STOPPED;
+			if (mei_hbm_stop_req(dev)) {
+				dev_err(dev->dev, "hbm: start: failed to send stop request\n");
+				return -EIO;
+			}
+			break;
+		}
+
+		mei_hbm_config_features(dev);
+
+		if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
+		    dev->hbm_state != MEI_HBM_STARTING) {
+			dev_err(dev->dev, "hbm: start: state mismatch, [%d, %d]\n",
+				dev->dev_state, dev->hbm_state);
+			return -EPROTO;
+		}
+
+		if (mei_hbm_enum_clients_req(dev)) {
+			dev_err(dev->dev, "hbm: start: failed to send enumeration request\n");
+			return -EIO;
+		}
+
+		wake_up(&dev->wait_hbm_start);
+		break;
+
+	case CLIENT_CONNECT_RES_CMD:
+		dev_dbg(dev->dev, "hbm: client connect response: message received.\n");
+		mei_hbm_cl_res(dev, cl_cmd, MEI_FOP_CONNECT);
+		break;
+
+	case CLIENT_DISCONNECT_RES_CMD:
+		dev_dbg(dev->dev, "hbm: client disconnect response: message received.\n");
+		mei_hbm_cl_res(dev, cl_cmd, MEI_FOP_DISCONNECT);
+		break;
+
+	case MEI_FLOW_CONTROL_CMD:
+		dev_dbg(dev->dev, "hbm: client flow control response: message received.\n");
+
+		flow_control = (struct hbm_flow_control *) mei_msg;
+		mei_hbm_cl_flow_control_res(dev, flow_control);
+		break;
+
+	case MEI_PG_ISOLATION_ENTRY_RES_CMD:
+		dev_dbg(dev->dev, "power gate isolation entry response received\n");
+		dev->pg_event = MEI_PG_EVENT_RECEIVED;
+		if (waitqueue_active(&dev->wait_pg))
+			wake_up(&dev->wait_pg);
+		break;
+
+	case MEI_PG_ISOLATION_EXIT_REQ_CMD:
+		dev_dbg(dev->dev, "power gate isolation exit request received\n");
+		dev->pg_event = MEI_PG_EVENT_RECEIVED;
+		if (waitqueue_active(&dev->wait_pg))
+			wake_up(&dev->wait_pg);
+		else
+			/*
+			* If the driver is not waiting on this then
+			* this is HW initiated exit from PG.
+			* Start runtime pm resume sequence to exit from PG.
+			*/
+			pm_request_resume(dev->dev);
+		break;
+
+	case HOST_CLIENT_PROPERTIES_RES_CMD:
+		dev_dbg(dev->dev, "hbm: properties response: message received.\n");
+
+		dev->init_clients_timer = 0;
+
+		if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
+		    dev->hbm_state != MEI_HBM_CLIENT_PROPERTIES) {
+			dev_err(dev->dev, "hbm: properties response: state mismatch, [%d, %d]\n",
+				dev->dev_state, dev->hbm_state);
+			return -EPROTO;
+		}
+
+		props_res = (struct hbm_props_response *)mei_msg;
+
+		if (props_res->status) {
+			dev_err(dev->dev, "hbm: properties response: wrong status = %d %s\n",
+				props_res->status,
+				mei_hbm_status_str(props_res->status));
+			return -EPROTO;
+		}
+
+		mei_hbm_me_cl_add(dev, props_res);
+
+		dev->me_client_index++;
+
+		/* request property for the next client */
+		if (mei_hbm_prop_req(dev))
+			return -EIO;
+
+		break;
+
+	case HOST_ENUM_RES_CMD:
+		dev_dbg(dev->dev, "hbm: enumeration response: message received\n");
+
+		dev->init_clients_timer = 0;
+
+		enum_res = (struct hbm_host_enum_response *) mei_msg;
+		BUILD_BUG_ON(sizeof(dev->me_clients_map)
+				< sizeof(enum_res->valid_addresses));
+		memcpy(dev->me_clients_map, enum_res->valid_addresses,
+				sizeof(enum_res->valid_addresses));
+
+		if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
+		    dev->hbm_state != MEI_HBM_ENUM_CLIENTS) {
+			dev_err(dev->dev, "hbm: enumeration response: state mismatch, [%d, %d]\n",
+				dev->dev_state, dev->hbm_state);
+			return -EPROTO;
+		}
+
+		dev->hbm_state = MEI_HBM_CLIENT_PROPERTIES;
+
+		/* first property request */
+		if (mei_hbm_prop_req(dev))
+			return -EIO;
+
+		break;
+
+	case HOST_STOP_RES_CMD:
+		dev_dbg(dev->dev, "hbm: stop response: message received\n");
+
+		dev->init_clients_timer = 0;
+
+		if (dev->hbm_state != MEI_HBM_STOPPED) {
+			dev_err(dev->dev, "hbm: stop response: state mismatch, [%d, %d]\n",
+				dev->dev_state, dev->hbm_state);
+			return -EPROTO;
+		}
+
+		dev->dev_state = MEI_DEV_POWER_DOWN;
+		dev_info(dev->dev, "hbm: stop response: resetting.\n");
+		/* force the reset */
+		return -EPROTO;
+		break;
+
+	case CLIENT_DISCONNECT_REQ_CMD:
+		dev_dbg(dev->dev, "hbm: disconnect request: message received\n");
+
+		disconnect_req = (struct hbm_client_connect_request *)mei_msg;
+		mei_hbm_fw_disconnect_req(dev, disconnect_req);
+		break;
+
+	case ME_STOP_REQ_CMD:
+		dev_dbg(dev->dev, "hbm: stop request: message received\n");
+		dev->hbm_state = MEI_HBM_STOPPED;
+		if (mei_hbm_stop_req(dev)) {
+			dev_err(dev->dev, "hbm: stop request: failed to send stop request\n");
+			return -EIO;
+		}
+		break;
+	default:
+		BUG();
+		break;
+
+	}
+	return 0;
+}
+
diff --git a/drivers/misc/mei/hbm.h b/drivers/misc/mei/hbm.h
new file mode 100644
index 000000000..2544db7d1
--- /dev/null
+++ b/drivers/misc/mei/hbm.h
@@ -0,0 +1,59 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2003-2012, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#ifndef _MEI_HBM_H_
+#define _MEI_HBM_H_
+
+struct mei_device;
+struct mei_msg_hdr;
+struct mei_cl;
+
+/**
+ * enum mei_hbm_state - host bus message protocol state
+ *
+ * @MEI_HBM_IDLE : protocol not started
+ * @MEI_HBM_STARTING : start request message was sent
+ * @MEI_HBM_ENUM_CLIENTS : enumeration request was sent
+ * @MEI_HBM_CLIENT_PROPERTIES : acquiring clients properties
+ * @MEI_HBM_STARTED : enumeration was completed
+ * @MEI_HBM_STOPPED : stopping exchange
+ */
+enum mei_hbm_state {
+	MEI_HBM_IDLE = 0,
+	MEI_HBM_STARTING,
+	MEI_HBM_ENUM_CLIENTS,
+	MEI_HBM_CLIENT_PROPERTIES,
+	MEI_HBM_STARTED,
+	MEI_HBM_STOPPED,
+};
+
+const char *mei_hbm_state_str(enum mei_hbm_state state);
+
+int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr);
+
+void mei_hbm_idle(struct mei_device *dev);
+void mei_hbm_reset(struct mei_device *dev);
+int mei_hbm_start_req(struct mei_device *dev);
+int mei_hbm_start_wait(struct mei_device *dev);
+int mei_hbm_cl_flow_control_req(struct mei_device *dev, struct mei_cl *cl);
+int mei_hbm_cl_disconnect_req(struct mei_device *dev, struct mei_cl *cl);
+int mei_hbm_cl_disconnect_rsp(struct mei_device *dev, struct mei_cl *cl);
+int mei_hbm_cl_connect_req(struct mei_device *dev, struct mei_cl *cl);
+bool mei_hbm_version_is_supported(struct mei_device *dev);
+int mei_hbm_pg(struct mei_device *dev, u8 pg_cmd);
+
+#endif /* _MEI_HBM_H_ */
+
diff --git a/drivers/misc/mei/hw-me-regs.h b/drivers/misc/mei/hw-me-regs.h
new file mode 100644
index 000000000..9eb7ed70a
--- /dev/null
+++ b/drivers/misc/mei/hw-me-regs.h
@@ -0,0 +1,190 @@
+/******************************************************************************
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Intel MEI Interface Header
+ *
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2003 - 2012 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
+ * USA
+ *
+ * The full GNU General Public License is included in this distribution
+ * in the file called LICENSE.GPL.
+ *
+ * Contact Information:
+ *	Intel Corporation.
+ *	linux-mei@linux.intel.com
+ *	http://www.intel.com
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2003 - 2012 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *  * Neither the name Intel Corporation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *****************************************************************************/
+#ifndef _MEI_HW_MEI_REGS_H_
+#define _MEI_HW_MEI_REGS_H_
+
+/*
+ * MEI device IDs
+ */
+#define MEI_DEV_ID_82946GZ    0x2974  /* 82946GZ/GL */
+#define MEI_DEV_ID_82G35      0x2984  /* 82G35 Express */
+#define MEI_DEV_ID_82Q965     0x2994  /* 82Q963/Q965 */
+#define MEI_DEV_ID_82G965     0x29A4  /* 82P965/G965 */
+
+#define MEI_DEV_ID_82GM965    0x2A04  /* Mobile PM965/GM965 */
+#define MEI_DEV_ID_82GME965   0x2A14  /* Mobile GME965/GLE960 */
+
+#define MEI_DEV_ID_ICH9_82Q35 0x29B4  /* 82Q35 Express */
+#define MEI_DEV_ID_ICH9_82G33 0x29C4  /* 82G33/G31/P35/P31 Express */
+#define MEI_DEV_ID_ICH9_82Q33 0x29D4  /* 82Q33 Express */
+#define MEI_DEV_ID_ICH9_82X38 0x29E4  /* 82X38/X48 Express */
+#define MEI_DEV_ID_ICH9_3200  0x29F4  /* 3200/3210 Server */
+
+#define MEI_DEV_ID_ICH9_6     0x28B4  /* Bearlake */
+#define MEI_DEV_ID_ICH9_7     0x28C4  /* Bearlake */
+#define MEI_DEV_ID_ICH9_8     0x28D4  /* Bearlake */
+#define MEI_DEV_ID_ICH9_9     0x28E4  /* Bearlake */
+#define MEI_DEV_ID_ICH9_10    0x28F4  /* Bearlake */
+
+#define MEI_DEV_ID_ICH9M_1    0x2A44  /* Cantiga */
+#define MEI_DEV_ID_ICH9M_2    0x2A54  /* Cantiga */
+#define MEI_DEV_ID_ICH9M_3    0x2A64  /* Cantiga */
+#define MEI_DEV_ID_ICH9M_4    0x2A74  /* Cantiga */
+
+#define MEI_DEV_ID_ICH10_1    0x2E04  /* Eaglelake */
+#define MEI_DEV_ID_ICH10_2    0x2E14  /* Eaglelake */
+#define MEI_DEV_ID_ICH10_3    0x2E24  /* Eaglelake */
+#define MEI_DEV_ID_ICH10_4    0x2E34  /* Eaglelake */
+
+#define MEI_DEV_ID_IBXPK_1    0x3B64  /* Calpella */
+#define MEI_DEV_ID_IBXPK_2    0x3B65  /* Calpella */
+
+#define MEI_DEV_ID_CPT_1      0x1C3A  /* Couger Point */
+#define MEI_DEV_ID_PBG_1      0x1D3A  /* C600/X79 Patsburg */
+
+#define MEI_DEV_ID_PPT_1      0x1E3A  /* Panther Point */
+#define MEI_DEV_ID_PPT_2      0x1CBA  /* Panther Point */
+#define MEI_DEV_ID_PPT_3      0x1DBA  /* Panther Point */
+
+#define MEI_DEV_ID_LPT_H      0x8C3A  /* Lynx Point H */
+#define MEI_DEV_ID_LPT_W      0x8D3A  /* Lynx Point - Wellsburg */
+#define MEI_DEV_ID_LPT_LP     0x9C3A  /* Lynx Point LP */
+#define MEI_DEV_ID_LPT_HR     0x8CBA  /* Lynx Point H Refresh */
+
+#define MEI_DEV_ID_WPT_LP     0x9CBA  /* Wildcat Point LP */
+#define MEI_DEV_ID_WPT_LP_2   0x9CBB  /* Wildcat Point LP 2 */
+
+/*
+ * MEI HW Section
+ */
+
+/* Host Firmware Status Registers in PCI Config Space */
+#define PCI_CFG_HFS_1         0x40
+#define PCI_CFG_HFS_2         0x48
+#define PCI_CFG_HFS_3         0x60
+#define PCI_CFG_HFS_4         0x64
+#define PCI_CFG_HFS_5         0x68
+#define PCI_CFG_HFS_6         0x6C
+
+/* MEI registers */
+/* H_CB_WW - Host Circular Buffer (CB) Write Window register */
+#define H_CB_WW    0
+/* H_CSR - Host Control Status register */
+#define H_CSR      4
+/* ME_CB_RW - ME Circular Buffer Read Window register (read only) */
+#define ME_CB_RW   8
+/* ME_CSR_HA - ME Control Status Host Access register (read only) */
+#define ME_CSR_HA  0xC
+/* H_HGC_CSR - PGI register */
+#define H_HPG_CSR  0x10
+
+
+/* register bits of H_CSR (Host Control Status register) */
+/* Host Circular Buffer Depth - maximum number of 32-bit entries in CB */
+#define H_CBD             0xFF000000
+/* Host Circular Buffer Write Pointer */
+#define H_CBWP            0x00FF0000
+/* Host Circular Buffer Read Pointer */
+#define H_CBRP            0x0000FF00
+/* Host Reset */
+#define H_RST             0x00000010
+/* Host Ready */
+#define H_RDY             0x00000008
+/* Host Interrupt Generate */
+#define H_IG              0x00000004
+/* Host Interrupt Status */
+#define H_IS              0x00000002
+/* Host Interrupt Enable */
+#define H_IE              0x00000001
+
+
+/* register bits of ME_CSR_HA (ME Control Status Host Access register) */
+/* ME CB (Circular Buffer) Depth HRA (Host Read Access) - host read only
+access to ME_CBD */
+#define ME_CBD_HRA        0xFF000000
+/* ME CB Write Pointer HRA - host read only access to ME_CBWP */
+#define ME_CBWP_HRA       0x00FF0000
+/* ME CB Read Pointer HRA - host read only access to ME_CBRP */
+#define ME_CBRP_HRA       0x0000FF00
+/* ME Power Gate Isolation Capability HRA  - host ready only access */
+#define ME_PGIC_HRA       0x00000040
+/* ME Reset HRA - host read only access to ME_RST */
+#define ME_RST_HRA        0x00000010
+/* ME Ready HRA - host read only access to ME_RDY */
+#define ME_RDY_HRA        0x00000008
+/* ME Interrupt Generate HRA - host read only access to ME_IG */
+#define ME_IG_HRA         0x00000004
+/* ME Interrupt Status HRA - host read only access to ME_IS */
+#define ME_IS_HRA         0x00000002
+/* ME Interrupt Enable HRA - host read only access to ME_IE */
+#define ME_IE_HRA         0x00000001
+
+
+/* register bits - H_HPG_CSR */
+#define H_HPG_CSR_PGIHEXR       0x00000001
+#define H_HPG_CSR_PGI           0x00000002
+
+#endif /* _MEI_HW_MEI_REGS_H_ */
diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c
new file mode 100644
index 000000000..43d7101ff
--- /dev/null
+++ b/drivers/misc/mei/hw-me.c
@@ -0,0 +1,998 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2003-2012, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#include <linux/pci.h>
+
+#include <linux/kthread.h>
+#include <linux/interrupt.h>
+
+#include "mei_dev.h"
+#include "hbm.h"
+
+#include "hw-me.h"
+#include "hw-me-regs.h"
+
+#include "mei-trace.h"
+
+/**
+ * mei_me_reg_read - Reads 32bit data from the mei device
+ *
+ * @hw: the me hardware structure
+ * @offset: offset from which to read the data
+ *
+ * Return: register value (u32)
+ */
+static inline u32 mei_me_reg_read(const struct mei_me_hw *hw,
+			       unsigned long offset)
+{
+	return ioread32(hw->mem_addr + offset);
+}
+
+
+/**
+ * mei_me_reg_write - Writes 32bit data to the mei device
+ *
+ * @hw: the me hardware structure
+ * @offset: offset from which to write the data
+ * @value: register value to write (u32)
+ */
+static inline void mei_me_reg_write(const struct mei_me_hw *hw,
+				 unsigned long offset, u32 value)
+{
+	iowrite32(value, hw->mem_addr + offset);
+}
+
+/**
+ * mei_me_mecbrw_read - Reads 32bit data from ME circular buffer
+ *  read window register
+ *
+ * @dev: the device structure
+ *
+ * Return: ME_CB_RW register value (u32)
+ */
+static inline u32 mei_me_mecbrw_read(const struct mei_device *dev)
+{
+	return mei_me_reg_read(to_me_hw(dev), ME_CB_RW);
+}
+
+/**
+ * mei_me_hcbww_write - write 32bit data to the host circular buffer
+ *
+ * @dev: the device structure
+ * @data: 32bit data to be written to the host circular buffer
+ */
+static inline void mei_me_hcbww_write(struct mei_device *dev, u32 data)
+{
+	mei_me_reg_write(to_me_hw(dev), H_CB_WW, data);
+}
+
+/**
+ * mei_me_mecsr_read - Reads 32bit data from the ME CSR
+ *
+ * @dev: the device structure
+ *
+ * Return: ME_CSR_HA register value (u32)
+ */
+static inline u32 mei_me_mecsr_read(const struct mei_device *dev)
+{
+	u32 reg;
+
+	reg = mei_me_reg_read(to_me_hw(dev), ME_CSR_HA);
+	trace_mei_reg_read(dev->dev, "ME_CSR_HA", ME_CSR_HA, reg);
+
+	return reg;
+}
+
+/**
+ * mei_hcsr_read - Reads 32bit data from the host CSR
+ *
+ * @dev: the device structure
+ *
+ * Return: H_CSR register value (u32)
+ */
+static inline u32 mei_hcsr_read(const struct mei_device *dev)
+{
+	u32 reg;
+
+	reg = mei_me_reg_read(to_me_hw(dev), H_CSR);
+	trace_mei_reg_read(dev->dev, "H_CSR", H_CSR, reg);
+
+	return reg;
+}
+
+/**
+ * mei_hcsr_write - writes H_CSR register to the mei device
+ *
+ * @dev: the device structure
+ * @reg: new register value
+ */
+static inline void mei_hcsr_write(struct mei_device *dev, u32 reg)
+{
+	trace_mei_reg_write(dev->dev, "H_CSR", H_CSR, reg);
+	mei_me_reg_write(to_me_hw(dev), H_CSR, reg);
+}
+
+/**
+ * mei_hcsr_set - writes H_CSR register to the mei device,
+ * and ignores the H_IS bit for it is write-one-to-zero.
+ *
+ * @dev: the device structure
+ * @reg: new register value
+ */
+static inline void mei_hcsr_set(struct mei_device *dev, u32 reg)
+{
+	reg &= ~H_IS;
+	mei_hcsr_write(dev, reg);
+}
+
+/**
+ * mei_me_fw_status - read fw status register from pci config space
+ *
+ * @dev: mei device
+ * @fw_status: fw status register values
+ *
+ * Return: 0 on success, error otherwise
+ */
+static int mei_me_fw_status(struct mei_device *dev,
+			    struct mei_fw_status *fw_status)
+{
+	struct pci_dev *pdev = to_pci_dev(dev->dev);
+	struct mei_me_hw *hw = to_me_hw(dev);
+	const struct mei_fw_status *fw_src = &hw->cfg->fw_status;
+	int ret;
+	int i;
+
+	if (!fw_status)
+		return -EINVAL;
+
+	fw_status->count = fw_src->count;
+	for (i = 0; i < fw_src->count && i < MEI_FW_STATUS_MAX; i++) {
+		ret = pci_read_config_dword(pdev,
+			fw_src->status[i], &fw_status->status[i]);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+/**
+ * mei_me_hw_config - configure hw dependent settings
+ *
+ * @dev: mei device
+ */
+static void mei_me_hw_config(struct mei_device *dev)
+{
+	struct mei_me_hw *hw = to_me_hw(dev);
+	u32 hcsr = mei_hcsr_read(dev);
+	/* Doesn't change in runtime */
+	dev->hbuf_depth = (hcsr & H_CBD) >> 24;
+
+	hw->pg_state = MEI_PG_OFF;
+}
+
+/**
+ * mei_me_pg_state  - translate internal pg state
+ *   to the mei power gating state
+ *
+ * @dev:  mei device
+ *
+ * Return: MEI_PG_OFF if aliveness is on and MEI_PG_ON otherwise
+ */
+static inline enum mei_pg_state mei_me_pg_state(struct mei_device *dev)
+{
+	struct mei_me_hw *hw = to_me_hw(dev);
+
+	return hw->pg_state;
+}
+
+/**
+ * mei_me_intr_clear - clear and stop interrupts
+ *
+ * @dev: the device structure
+ */
+static void mei_me_intr_clear(struct mei_device *dev)
+{
+	u32 hcsr = mei_hcsr_read(dev);
+
+	if ((hcsr & H_IS) == H_IS)
+		mei_hcsr_write(dev, hcsr);
+}
+/**
+ * mei_me_intr_enable - enables mei device interrupts
+ *
+ * @dev: the device structure
+ */
+static void mei_me_intr_enable(struct mei_device *dev)
+{
+	u32 hcsr = mei_hcsr_read(dev);
+
+	hcsr |= H_IE;
+	mei_hcsr_set(dev, hcsr);
+}
+
+/**
+ * mei_me_intr_disable - disables mei device interrupts
+ *
+ * @dev: the device structure
+ */
+static void mei_me_intr_disable(struct mei_device *dev)
+{
+	u32 hcsr = mei_hcsr_read(dev);
+
+	hcsr  &= ~H_IE;
+	mei_hcsr_set(dev, hcsr);
+}
+
+/**
+ * mei_me_hw_reset_release - release device from the reset
+ *
+ * @dev: the device structure
+ */
+static void mei_me_hw_reset_release(struct mei_device *dev)
+{
+	u32 hcsr = mei_hcsr_read(dev);
+
+	hcsr |= H_IG;
+	hcsr &= ~H_RST;
+	mei_hcsr_set(dev, hcsr);
+
+	/* complete this write before we set host ready on another CPU */
+	mmiowb();
+}
+/**
+ * mei_me_hw_reset - resets fw via mei csr register.
+ *
+ * @dev: the device structure
+ * @intr_enable: if interrupt should be enabled after reset.
+ *
+ * Return: always 0
+ */
+static int mei_me_hw_reset(struct mei_device *dev, bool intr_enable)
+{
+	u32 hcsr = mei_hcsr_read(dev);
+
+	/* H_RST may be found lit before reset is started,
+	 * for example if preceding reset flow hasn't completed.
+	 * In that case asserting H_RST will be ignored, therefore
+	 * we need to clean H_RST bit to start a successful reset sequence.
+	 */
+	if ((hcsr & H_RST) == H_RST) {
+		dev_warn(dev->dev, "H_RST is set = 0x%08X", hcsr);
+		hcsr &= ~H_RST;
+		mei_hcsr_set(dev, hcsr);
+		hcsr = mei_hcsr_read(dev);
+	}
+
+	hcsr |= H_RST | H_IG | H_IS;
+
+	if (intr_enable)
+		hcsr |= H_IE;
+	else
+		hcsr &= ~H_IE;
+
+	dev->recvd_hw_ready = false;
+	mei_hcsr_write(dev, hcsr);
+
+	/*
+	 * Host reads the H_CSR once to ensure that the
+	 * posted write to H_CSR completes.
+	 */
+	hcsr = mei_hcsr_read(dev);
+
+	if ((hcsr & H_RST) == 0)
+		dev_warn(dev->dev, "H_RST is not set = 0x%08X", hcsr);
+
+	if ((hcsr & H_RDY) == H_RDY)
+		dev_warn(dev->dev, "H_RDY is not cleared 0x%08X", hcsr);
+
+	if (intr_enable == false)
+		mei_me_hw_reset_release(dev);
+
+	return 0;
+}
+
+/**
+ * mei_me_host_set_ready - enable device
+ *
+ * @dev: mei device
+ */
+static void mei_me_host_set_ready(struct mei_device *dev)
+{
+	u32 hcsr = mei_hcsr_read(dev);
+
+	hcsr |= H_IE | H_IG | H_RDY;
+	mei_hcsr_set(dev, hcsr);
+}
+
+/**
+ * mei_me_host_is_ready - check whether the host has turned ready
+ *
+ * @dev: mei device
+ * Return: bool
+ */
+static bool mei_me_host_is_ready(struct mei_device *dev)
+{
+	u32 hcsr = mei_hcsr_read(dev);
+
+	return (hcsr & H_RDY) == H_RDY;
+}
+
+/**
+ * mei_me_hw_is_ready - check whether the me(hw) has turned ready
+ *
+ * @dev: mei device
+ * Return: bool
+ */
+static bool mei_me_hw_is_ready(struct mei_device *dev)
+{
+	u32 mecsr = mei_me_mecsr_read(dev);
+
+	return (mecsr & ME_RDY_HRA) == ME_RDY_HRA;
+}
+
+/**
+ * mei_me_hw_ready_wait - wait until the me(hw) has turned ready
+ *  or timeout is reached
+ *
+ * @dev: mei device
+ * Return: 0 on success, error otherwise
+ */
+static int mei_me_hw_ready_wait(struct mei_device *dev)
+{
+	mutex_unlock(&dev->device_lock);
+	wait_event_timeout(dev->wait_hw_ready,
+			dev->recvd_hw_ready,
+			mei_secs_to_jiffies(MEI_HW_READY_TIMEOUT));
+	mutex_lock(&dev->device_lock);
+	if (!dev->recvd_hw_ready) {
+		dev_err(dev->dev, "wait hw ready failed\n");
+		return -ETIME;
+	}
+
+	mei_me_hw_reset_release(dev);
+	dev->recvd_hw_ready = false;
+	return 0;
+}
+
+/**
+ * mei_me_hw_start - hw start routine
+ *
+ * @dev: mei device
+ * Return: 0 on success, error otherwise
+ */
+static int mei_me_hw_start(struct mei_device *dev)
+{
+	int ret = mei_me_hw_ready_wait(dev);
+
+	if (ret)
+		return ret;
+	dev_dbg(dev->dev, "hw is ready\n");
+
+	mei_me_host_set_ready(dev);
+	return ret;
+}
+
+
+/**
+ * mei_hbuf_filled_slots - gets number of device filled buffer slots
+ *
+ * @dev: the device structure
+ *
+ * Return: number of filled slots
+ */
+static unsigned char mei_hbuf_filled_slots(struct mei_device *dev)
+{
+	u32 hcsr;
+	char read_ptr, write_ptr;
+
+	hcsr = mei_hcsr_read(dev);
+
+	read_ptr = (char) ((hcsr & H_CBRP) >> 8);
+	write_ptr = (char) ((hcsr & H_CBWP) >> 16);
+
+	return (unsigned char) (write_ptr - read_ptr);
+}
+
+/**
+ * mei_me_hbuf_is_empty - checks if host buffer is empty.
+ *
+ * @dev: the device structure
+ *
+ * Return: true if empty, false - otherwise.
+ */
+static bool mei_me_hbuf_is_empty(struct mei_device *dev)
+{
+	return mei_hbuf_filled_slots(dev) == 0;
+}
+
+/**
+ * mei_me_hbuf_empty_slots - counts write empty slots.
+ *
+ * @dev: the device structure
+ *
+ * Return: -EOVERFLOW if overflow, otherwise empty slots count
+ */
+static int mei_me_hbuf_empty_slots(struct mei_device *dev)
+{
+	unsigned char filled_slots, empty_slots;
+
+	filled_slots = mei_hbuf_filled_slots(dev);
+	empty_slots = dev->hbuf_depth - filled_slots;
+
+	/* check for overflow */
+	if (filled_slots > dev->hbuf_depth)
+		return -EOVERFLOW;
+
+	return empty_slots;
+}
+
+/**
+ * mei_me_hbuf_max_len - returns size of hw buffer.
+ *
+ * @dev: the device structure
+ *
+ * Return: size of hw buffer in bytes
+ */
+static size_t mei_me_hbuf_max_len(const struct mei_device *dev)
+{
+	return dev->hbuf_depth * sizeof(u32) - sizeof(struct mei_msg_hdr);
+}
+
+
+/**
+ * mei_me_write_message - writes a message to mei device.
+ *
+ * @dev: the device structure
+ * @header: mei HECI header of message
+ * @buf: message payload will be written
+ *
+ * Return: -EIO if write has failed
+ */
+static int mei_me_write_message(struct mei_device *dev,
+			struct mei_msg_hdr *header,
+			unsigned char *buf)
+{
+	unsigned long rem;
+	unsigned long length = header->length;
+	u32 *reg_buf = (u32 *)buf;
+	u32 hcsr;
+	u32 dw_cnt;
+	int i;
+	int empty_slots;
+
+	dev_dbg(dev->dev, MEI_HDR_FMT, MEI_HDR_PRM(header));
+
+	empty_slots = mei_hbuf_empty_slots(dev);
+	dev_dbg(dev->dev, "empty slots = %hu.\n", empty_slots);
+
+	dw_cnt = mei_data2slots(length);
+	if (empty_slots < 0 || dw_cnt > empty_slots)
+		return -EMSGSIZE;
+
+	mei_me_hcbww_write(dev, *((u32 *) header));
+
+	for (i = 0; i < length / 4; i++)
+		mei_me_hcbww_write(dev, reg_buf[i]);
+
+	rem = length & 0x3;
+	if (rem > 0) {
+		u32 reg = 0;
+
+		memcpy(&reg, &buf[length - rem], rem);
+		mei_me_hcbww_write(dev, reg);
+	}
+
+	hcsr = mei_hcsr_read(dev) | H_IG;
+	mei_hcsr_set(dev, hcsr);
+	if (!mei_me_hw_is_ready(dev))
+		return -EIO;
+
+	return 0;
+}
+
+/**
+ * mei_me_count_full_read_slots - counts read full slots.
+ *
+ * @dev: the device structure
+ *
+ * Return: -EOVERFLOW if overflow, otherwise filled slots count
+ */
+static int mei_me_count_full_read_slots(struct mei_device *dev)
+{
+	u32 me_csr;
+	char read_ptr, write_ptr;
+	unsigned char buffer_depth, filled_slots;
+
+	me_csr = mei_me_mecsr_read(dev);
+	buffer_depth = (unsigned char)((me_csr & ME_CBD_HRA) >> 24);
+	read_ptr = (char) ((me_csr & ME_CBRP_HRA) >> 8);
+	write_ptr = (char) ((me_csr & ME_CBWP_HRA) >> 16);
+	filled_slots = (unsigned char) (write_ptr - read_ptr);
+
+	/* check for overflow */
+	if (filled_slots > buffer_depth)
+		return -EOVERFLOW;
+
+	dev_dbg(dev->dev, "filled_slots =%08x\n", filled_slots);
+	return (int)filled_slots;
+}
+
+/**
+ * mei_me_read_slots - reads a message from mei device.
+ *
+ * @dev: the device structure
+ * @buffer: message buffer will be written
+ * @buffer_length: message size will be read
+ *
+ * Return: always 0
+ */
+static int mei_me_read_slots(struct mei_device *dev, unsigned char *buffer,
+		    unsigned long buffer_length)
+{
+	u32 *reg_buf = (u32 *)buffer;
+	u32 hcsr;
+
+	for (; buffer_length >= sizeof(u32); buffer_length -= sizeof(u32))
+		*reg_buf++ = mei_me_mecbrw_read(dev);
+
+	if (buffer_length > 0) {
+		u32 reg = mei_me_mecbrw_read(dev);
+
+		memcpy(reg_buf, &reg, buffer_length);
+	}
+
+	hcsr = mei_hcsr_read(dev) | H_IG;
+	mei_hcsr_set(dev, hcsr);
+	return 0;
+}
+
+/**
+ * mei_me_pg_set - write pg enter register
+ *
+ * @dev: the device structure
+ */
+static void mei_me_pg_set(struct mei_device *dev)
+{
+	struct mei_me_hw *hw = to_me_hw(dev);
+	u32 reg;
+
+	reg = mei_me_reg_read(hw, H_HPG_CSR);
+	trace_mei_reg_read(dev->dev, "H_HPG_CSR", H_HPG_CSR, reg);
+
+	reg |= H_HPG_CSR_PGI;
+
+	trace_mei_reg_write(dev->dev, "H_HPG_CSR", H_HPG_CSR, reg);
+	mei_me_reg_write(hw, H_HPG_CSR, reg);
+}
+
+/**
+ * mei_me_pg_unset - write pg exit register
+ *
+ * @dev: the device structure
+ */
+static void mei_me_pg_unset(struct mei_device *dev)
+{
+	struct mei_me_hw *hw = to_me_hw(dev);
+	u32 reg;
+
+	reg = mei_me_reg_read(hw, H_HPG_CSR);
+	trace_mei_reg_read(dev->dev, "H_HPG_CSR", H_HPG_CSR, reg);
+
+	WARN(!(reg & H_HPG_CSR_PGI), "PGI is not set\n");
+
+	reg |= H_HPG_CSR_PGIHEXR;
+
+	trace_mei_reg_write(dev->dev, "H_HPG_CSR", H_HPG_CSR, reg);
+	mei_me_reg_write(hw, H_HPG_CSR, reg);
+}
+
+/**
+ * mei_me_pg_enter_sync - perform pg entry procedure
+ *
+ * @dev: the device structure
+ *
+ * Return: 0 on success an error code otherwise
+ */
+int mei_me_pg_enter_sync(struct mei_device *dev)
+{
+	struct mei_me_hw *hw = to_me_hw(dev);
+	unsigned long timeout = mei_secs_to_jiffies(MEI_PGI_TIMEOUT);
+	int ret;
+
+	dev->pg_event = MEI_PG_EVENT_WAIT;
+
+	ret = mei_hbm_pg(dev, MEI_PG_ISOLATION_ENTRY_REQ_CMD);
+	if (ret)
+		return ret;
+
+	mutex_unlock(&dev->device_lock);
+	wait_event_timeout(dev->wait_pg,
+		dev->pg_event == MEI_PG_EVENT_RECEIVED, timeout);
+	mutex_lock(&dev->device_lock);
+
+	if (dev->pg_event == MEI_PG_EVENT_RECEIVED) {
+		mei_me_pg_set(dev);
+		ret = 0;
+	} else {
+		ret = -ETIME;
+	}
+
+	dev->pg_event = MEI_PG_EVENT_IDLE;
+	hw->pg_state = MEI_PG_ON;
+
+	return ret;
+}
+
+/**
+ * mei_me_pg_exit_sync - perform pg exit procedure
+ *
+ * @dev: the device structure
+ *
+ * Return: 0 on success an error code otherwise
+ */
+int mei_me_pg_exit_sync(struct mei_device *dev)
+{
+	struct mei_me_hw *hw = to_me_hw(dev);
+	unsigned long timeout = mei_secs_to_jiffies(MEI_PGI_TIMEOUT);
+	int ret;
+
+	if (dev->pg_event == MEI_PG_EVENT_RECEIVED)
+		goto reply;
+
+	dev->pg_event = MEI_PG_EVENT_WAIT;
+
+	mei_me_pg_unset(dev);
+
+	mutex_unlock(&dev->device_lock);
+	wait_event_timeout(dev->wait_pg,
+		dev->pg_event == MEI_PG_EVENT_RECEIVED, timeout);
+	mutex_lock(&dev->device_lock);
+
+reply:
+	if (dev->pg_event != MEI_PG_EVENT_RECEIVED) {
+		ret = -ETIME;
+		goto out;
+	}
+
+	dev->pg_event = MEI_PG_EVENT_INTR_WAIT;
+	ret = mei_hbm_pg(dev, MEI_PG_ISOLATION_EXIT_RES_CMD);
+	if (ret)
+		return ret;
+
+	mutex_unlock(&dev->device_lock);
+	wait_event_timeout(dev->wait_pg,
+		dev->pg_event == MEI_PG_EVENT_INTR_RECEIVED, timeout);
+	mutex_lock(&dev->device_lock);
+
+	if (dev->pg_event == MEI_PG_EVENT_INTR_RECEIVED)
+		ret = 0;
+	else
+		ret = -ETIME;
+
+out:
+	dev->pg_event = MEI_PG_EVENT_IDLE;
+	hw->pg_state = MEI_PG_OFF;
+
+	return ret;
+}
+
+/**
+ * mei_me_pg_in_transition - is device now in pg transition
+ *
+ * @dev: the device structure
+ *
+ * Return: true if in pg transition, false otherwise
+ */
+static bool mei_me_pg_in_transition(struct mei_device *dev)
+{
+	return dev->pg_event >= MEI_PG_EVENT_WAIT &&
+	       dev->pg_event <= MEI_PG_EVENT_INTR_WAIT;
+}
+
+/**
+ * mei_me_pg_is_enabled - detect if PG is supported by HW
+ *
+ * @dev: the device structure
+ *
+ * Return: true is pg supported, false otherwise
+ */
+static bool mei_me_pg_is_enabled(struct mei_device *dev)
+{
+	u32 reg = mei_me_mecsr_read(dev);
+
+	if ((reg & ME_PGIC_HRA) == 0)
+		goto notsupported;
+
+	if (!dev->hbm_f_pg_supported)
+		goto notsupported;
+
+	return true;
+
+notsupported:
+	dev_dbg(dev->dev, "pg: not supported: HGP = %d hbm version %d.%d ?= %d.%d\n",
+		!!(reg & ME_PGIC_HRA),
+		dev->version.major_version,
+		dev->version.minor_version,
+		HBM_MAJOR_VERSION_PGI,
+		HBM_MINOR_VERSION_PGI);
+
+	return false;
+}
+
+/**
+ * mei_me_pg_intr - perform pg processing in interrupt thread handler
+ *
+ * @dev: the device structure
+ */
+static void mei_me_pg_intr(struct mei_device *dev)
+{
+	struct mei_me_hw *hw = to_me_hw(dev);
+
+	if (dev->pg_event != MEI_PG_EVENT_INTR_WAIT)
+		return;
+
+	dev->pg_event = MEI_PG_EVENT_INTR_RECEIVED;
+	hw->pg_state = MEI_PG_OFF;
+	if (waitqueue_active(&dev->wait_pg))
+		wake_up(&dev->wait_pg);
+}
+
+/**
+ * mei_me_irq_quick_handler - The ISR of the MEI device
+ *
+ * @irq: The irq number
+ * @dev_id: pointer to the device structure
+ *
+ * Return: irqreturn_t
+ */
+
+irqreturn_t mei_me_irq_quick_handler(int irq, void *dev_id)
+{
+	struct mei_device *dev = (struct mei_device *) dev_id;
+	u32 hcsr = mei_hcsr_read(dev);
+
+	if ((hcsr & H_IS) != H_IS)
+		return IRQ_NONE;
+
+	/* clear H_IS bit in H_CSR */
+	mei_hcsr_write(dev, hcsr);
+
+	return IRQ_WAKE_THREAD;
+}
+
+/**
+ * mei_me_irq_thread_handler - function called after ISR to handle the interrupt
+ * processing.
+ *
+ * @irq: The irq number
+ * @dev_id: pointer to the device structure
+ *
+ * Return: irqreturn_t
+ *
+ */
+irqreturn_t mei_me_irq_thread_handler(int irq, void *dev_id)
+{
+	struct mei_device *dev = (struct mei_device *) dev_id;
+	struct mei_cl_cb complete_list;
+	s32 slots;
+	int rets = 0;
+
+	dev_dbg(dev->dev, "function called after ISR to handle the interrupt processing.\n");
+	/* initialize our complete list */
+	mutex_lock(&dev->device_lock);
+	mei_io_list_init(&complete_list);
+
+	/* Ack the interrupt here
+	 * In case of MSI we don't go through the quick handler */
+	if (pci_dev_msi_enabled(to_pci_dev(dev->dev)))
+		mei_clear_interrupts(dev);
+
+	/* check if ME wants a reset */
+	if (!mei_hw_is_ready(dev) && dev->dev_state != MEI_DEV_RESETTING) {
+		dev_warn(dev->dev, "FW not ready: resetting.\n");
+		schedule_work(&dev->reset_work);
+		goto end;
+	}
+
+	mei_me_pg_intr(dev);
+
+	/*  check if we need to start the dev */
+	if (!mei_host_is_ready(dev)) {
+		if (mei_hw_is_ready(dev)) {
+			dev_dbg(dev->dev, "we need to start the dev.\n");
+			dev->recvd_hw_ready = true;
+			wake_up(&dev->wait_hw_ready);
+		} else {
+			dev_dbg(dev->dev, "Spurious Interrupt\n");
+		}
+		goto end;
+	}
+	/* check slots available for reading */
+	slots = mei_count_full_read_slots(dev);
+	while (slots > 0) {
+		dev_dbg(dev->dev, "slots to read = %08x\n", slots);
+		rets = mei_irq_read_handler(dev, &complete_list, &slots);
+		/* There is a race between ME write and interrupt delivery:
+		 * Not all data is always available immediately after the
+		 * interrupt, so try to read again on the next interrupt.
+		 */
+		if (rets == -ENODATA)
+			break;
+
+		if (rets && dev->dev_state != MEI_DEV_RESETTING) {
+			dev_err(dev->dev, "mei_irq_read_handler ret = %d.\n",
+						rets);
+			schedule_work(&dev->reset_work);
+			goto end;
+		}
+	}
+
+	dev->hbuf_is_ready = mei_hbuf_is_ready(dev);
+
+	/*
+	 * During PG handshake only allowed write is the replay to the
+	 * PG exit message, so block calling write function
+	 * if the pg event is in PG handshake
+	 */
+	if (dev->pg_event != MEI_PG_EVENT_WAIT &&
+	    dev->pg_event != MEI_PG_EVENT_RECEIVED) {
+		rets = mei_irq_write_handler(dev, &complete_list);
+		dev->hbuf_is_ready = mei_hbuf_is_ready(dev);
+	}
+
+	mei_irq_compl_handler(dev, &complete_list);
+
+end:
+	dev_dbg(dev->dev, "interrupt thread end ret = %d\n", rets);
+	mutex_unlock(&dev->device_lock);
+	return IRQ_HANDLED;
+}
+
+static const struct mei_hw_ops mei_me_hw_ops = {
+
+	.fw_status = mei_me_fw_status,
+	.pg_state  = mei_me_pg_state,
+
+	.host_is_ready = mei_me_host_is_ready,
+
+	.hw_is_ready = mei_me_hw_is_ready,
+	.hw_reset = mei_me_hw_reset,
+	.hw_config = mei_me_hw_config,
+	.hw_start = mei_me_hw_start,
+
+	.pg_in_transition = mei_me_pg_in_transition,
+	.pg_is_enabled = mei_me_pg_is_enabled,
+
+	.intr_clear = mei_me_intr_clear,
+	.intr_enable = mei_me_intr_enable,
+	.intr_disable = mei_me_intr_disable,
+
+	.hbuf_free_slots = mei_me_hbuf_empty_slots,
+	.hbuf_is_ready = mei_me_hbuf_is_empty,
+	.hbuf_max_len = mei_me_hbuf_max_len,
+
+	.write = mei_me_write_message,
+
+	.rdbuf_full_slots = mei_me_count_full_read_slots,
+	.read_hdr = mei_me_mecbrw_read,
+	.read = mei_me_read_slots
+};
+
+static bool mei_me_fw_type_nm(struct pci_dev *pdev)
+{
+	u32 reg;
+
+	pci_read_config_dword(pdev, PCI_CFG_HFS_2, &reg);
+	/* make sure that bit 9 (NM) is up and bit 10 (DM) is down */
+	return (reg & 0x600) == 0x200;
+}
+
+#define MEI_CFG_FW_NM                           \
+	.quirk_probe = mei_me_fw_type_nm
+
+static bool mei_me_fw_type_sps(struct pci_dev *pdev)
+{
+	u32 reg;
+	/* Read ME FW Status check for SPS Firmware */
+	pci_read_config_dword(pdev, PCI_CFG_HFS_1, &reg);
+	/* if bits [19:16] = 15, running SPS Firmware */
+	return (reg & 0xf0000) == 0xf0000;
+}
+
+#define MEI_CFG_FW_SPS                           \
+	.quirk_probe = mei_me_fw_type_sps
+
+
+#define MEI_CFG_LEGACY_HFS                      \
+	.fw_status.count = 0
+
+#define MEI_CFG_ICH_HFS                        \
+	.fw_status.count = 1,                   \
+	.fw_status.status[0] = PCI_CFG_HFS_1
+
+#define MEI_CFG_PCH_HFS                         \
+	.fw_status.count = 2,                   \
+	.fw_status.status[0] = PCI_CFG_HFS_1,   \
+	.fw_status.status[1] = PCI_CFG_HFS_2
+
+#define MEI_CFG_PCH8_HFS                        \
+	.fw_status.count = 6,                   \
+	.fw_status.status[0] = PCI_CFG_HFS_1,   \
+	.fw_status.status[1] = PCI_CFG_HFS_2,   \
+	.fw_status.status[2] = PCI_CFG_HFS_3,   \
+	.fw_status.status[3] = PCI_CFG_HFS_4,   \
+	.fw_status.status[4] = PCI_CFG_HFS_5,   \
+	.fw_status.status[5] = PCI_CFG_HFS_6
+
+/* ICH Legacy devices */
+const struct mei_cfg mei_me_legacy_cfg = {
+	MEI_CFG_LEGACY_HFS,
+};
+
+/* ICH devices */
+const struct mei_cfg mei_me_ich_cfg = {
+	MEI_CFG_ICH_HFS,
+};
+
+/* PCH devices */
+const struct mei_cfg mei_me_pch_cfg = {
+	MEI_CFG_PCH_HFS,
+};
+
+
+/* PCH Cougar Point and Patsburg with quirk for Node Manager exclusion */
+const struct mei_cfg mei_me_pch_cpt_pbg_cfg = {
+	MEI_CFG_PCH_HFS,
+	MEI_CFG_FW_NM,
+};
+
+/* PCH8 Lynx Point and newer devices */
+const struct mei_cfg mei_me_pch8_cfg = {
+	MEI_CFG_PCH8_HFS,
+};
+
+/* PCH8 Lynx Point with quirk for SPS Firmware exclusion */
+const struct mei_cfg mei_me_pch8_sps_cfg = {
+	MEI_CFG_PCH8_HFS,
+	MEI_CFG_FW_SPS,
+};
+
+/**
+ * mei_me_dev_init - allocates and initializes the mei device structure
+ *
+ * @pdev: The pci device structure
+ * @cfg: per device generation config
+ *
+ * Return: The mei_device_device pointer on success, NULL on failure.
+ */
+struct mei_device *mei_me_dev_init(struct pci_dev *pdev,
+				   const struct mei_cfg *cfg)
+{
+	struct mei_device *dev;
+	struct mei_me_hw *hw;
+
+	dev = kzalloc(sizeof(struct mei_device) +
+			 sizeof(struct mei_me_hw), GFP_KERNEL);
+	if (!dev)
+		return NULL;
+	hw = to_me_hw(dev);
+
+	mei_device_init(dev, &pdev->dev, &mei_me_hw_ops);
+	hw->cfg = cfg;
+	return dev;
+}
+
diff --git a/drivers/misc/mei/hw-me.h b/drivers/misc/mei/hw-me.h
new file mode 100644
index 000000000..6022d52af
--- /dev/null
+++ b/drivers/misc/mei/hw-me.h
@@ -0,0 +1,80 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2003-2012, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+
+
+
+#ifndef _MEI_INTERFACE_H_
+#define _MEI_INTERFACE_H_
+
+#include <linux/irqreturn.h>
+#include <linux/pci.h>
+#include <linux/mei.h>
+
+#include "mei_dev.h"
+#include "client.h"
+
+/*
+ * mei_cfg - mei device configuration
+ *
+ * @fw_status: FW status
+ * @quirk_probe: device exclusion quirk
+ */
+struct mei_cfg {
+	const struct mei_fw_status fw_status;
+	bool (*quirk_probe)(struct pci_dev *pdev);
+};
+
+
+#define MEI_PCI_DEVICE(dev, cfg) \
+	.vendor = PCI_VENDOR_ID_INTEL, .device = (dev), \
+	.subvendor = PCI_ANY_ID, .subdevice = PCI_ANY_ID, \
+	.driver_data = (kernel_ulong_t)&(cfg)
+
+
+#define MEI_ME_RPM_TIMEOUT    500 /* ms */
+
+/**
+ * struct mei_me_hw - me hw specific data
+ *
+ * @cfg: per device generation config and ops
+ * @mem_addr:  io memory address
+ * @pg_state:      power gating state
+ */
+struct mei_me_hw {
+	const struct mei_cfg *cfg;
+	void __iomem *mem_addr;
+	enum mei_pg_state pg_state;
+};
+
+#define to_me_hw(dev) (struct mei_me_hw *)((dev)->hw)
+
+extern const struct mei_cfg mei_me_legacy_cfg;
+extern const struct mei_cfg mei_me_ich_cfg;
+extern const struct mei_cfg mei_me_pch_cfg;
+extern const struct mei_cfg mei_me_pch_cpt_pbg_cfg;
+extern const struct mei_cfg mei_me_pch8_cfg;
+extern const struct mei_cfg mei_me_pch8_sps_cfg;
+
+struct mei_device *mei_me_dev_init(struct pci_dev *pdev,
+				   const struct mei_cfg *cfg);
+
+int mei_me_pg_enter_sync(struct mei_device *dev);
+int mei_me_pg_exit_sync(struct mei_device *dev);
+
+irqreturn_t mei_me_irq_quick_handler(int irq, void *dev_id);
+irqreturn_t mei_me_irq_thread_handler(int irq, void *dev_id);
+
+#endif /* _MEI_INTERFACE_H_ */
diff --git a/drivers/misc/mei/hw-txe-regs.h b/drivers/misc/mei/hw-txe-regs.h
new file mode 100644
index 000000000..f19229c4e
--- /dev/null
+++ b/drivers/misc/mei/hw-txe-regs.h
@@ -0,0 +1,294 @@
+/******************************************************************************
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Intel MEI Interface Header
+ *
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2013 - 2014 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * The full GNU General Public License is included in this distribution
+ * in the file called COPYING
+ *
+ * Contact Information:
+ *	Intel Corporation.
+ *	linux-mei@linux.intel.com
+ *	http://www.intel.com
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2013 - 2014 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *  * Neither the name Intel Corporation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *****************************************************************************/
+#ifndef _MEI_HW_TXE_REGS_H_
+#define _MEI_HW_TXE_REGS_H_
+
+#include "hw.h"
+
+#define SEC_ALIVENESS_TIMER_TIMEOUT        (5 * MSEC_PER_SEC)
+#define SEC_ALIVENESS_WAIT_TIMEOUT         (1 * MSEC_PER_SEC)
+#define SEC_RESET_WAIT_TIMEOUT             (1 * MSEC_PER_SEC)
+#define SEC_READY_WAIT_TIMEOUT             (5 * MSEC_PER_SEC)
+#define START_MESSAGE_RESPONSE_WAIT_TIMEOUT (5 * MSEC_PER_SEC)
+#define RESET_CANCEL_WAIT_TIMEOUT          (1 * MSEC_PER_SEC)
+
+enum {
+	SEC_BAR,
+	BRIDGE_BAR,
+
+	NUM_OF_MEM_BARS
+};
+
+/* SeC FW Status Register
+ *
+ * FW uses this register in order to report its status to host.
+ * This register resides in PCI-E config space.
+ */
+#define PCI_CFG_TXE_FW_STS0   0x40
+#  define PCI_CFG_TXE_FW_STS0_WRK_ST_MSK    0x0000000F
+#  define PCI_CFG_TXE_FW_STS0_OP_ST_MSK     0x000001C0
+#  define PCI_CFG_TXE_FW_STS0_FW_INIT_CMPLT 0x00000200
+#  define PCI_CFG_TXE_FW_STS0_ERR_CODE_MSK  0x0000F000
+#  define PCI_CFG_TXE_FW_STS0_OP_MODE_MSK   0x000F0000
+#  define PCI_CFG_TXE_FW_STS0_RST_CNT_MSK   0x00F00000
+#define PCI_CFG_TXE_FW_STS1   0x48
+
+#define IPC_BASE_ADDR	0x80400 /* SeC IPC Base Address */
+
+/* IPC Input Doorbell Register */
+#define SEC_IPC_INPUT_DOORBELL_REG       (0x0000 + IPC_BASE_ADDR)
+
+/* IPC Input Status Register
+ * This register indicates whether or not processing of
+ * the most recent command has been completed by the SEC
+ * New commands and payloads should not be written by the Host
+ * until this indicates that the previous command has been processed.
+ */
+#define SEC_IPC_INPUT_STATUS_REG         (0x0008 + IPC_BASE_ADDR)
+#  define SEC_IPC_INPUT_STATUS_RDY    BIT(0)
+
+/* IPC Host Interrupt Status Register */
+#define SEC_IPC_HOST_INT_STATUS_REG      (0x0010 + IPC_BASE_ADDR)
+#define   SEC_IPC_HOST_INT_STATUS_OUT_DB             BIT(0)
+#define   SEC_IPC_HOST_INT_STATUS_IN_RDY             BIT(1)
+#define   SEC_IPC_HOST_INT_STATUS_HDCP_M0_RCVD       BIT(5)
+#define   SEC_IPC_HOST_INT_STATUS_ILL_MEM_ACCESS     BIT(17)
+#define   SEC_IPC_HOST_INT_STATUS_AES_HKEY_ERR       BIT(18)
+#define   SEC_IPC_HOST_INT_STATUS_DES_HKEY_ERR       BIT(19)
+#define   SEC_IPC_HOST_INT_STATUS_TMRMTB_OVERFLOW    BIT(21)
+
+/* Convenient mask for pending interrupts */
+#define   SEC_IPC_HOST_INT_STATUS_PENDING \
+		(SEC_IPC_HOST_INT_STATUS_OUT_DB| \
+		SEC_IPC_HOST_INT_STATUS_IN_RDY)
+
+/* IPC Host Interrupt Mask Register */
+#define SEC_IPC_HOST_INT_MASK_REG        (0x0014 + IPC_BASE_ADDR)
+
+#  define SEC_IPC_HOST_INT_MASK_OUT_DB	BIT(0) /* Output Doorbell Int Mask */
+#  define SEC_IPC_HOST_INT_MASK_IN_RDY	BIT(1) /* Input Ready Int Mask */
+
+/* IPC Input Payload RAM */
+#define SEC_IPC_INPUT_PAYLOAD_REG        (0x0100 + IPC_BASE_ADDR)
+/* IPC Shared Payload RAM */
+#define IPC_SHARED_PAYLOAD_REG           (0x0200 + IPC_BASE_ADDR)
+
+/* SeC Address Translation Table Entry 2 - Ctrl
+ *
+ * This register resides also in SeC's PCI-E Memory space.
+ */
+#define SATT2_CTRL_REG                   0x1040
+#  define SATT2_CTRL_VALID_MSK            BIT(0)
+#  define SATT2_CTRL_BR_BASE_ADDR_REG_SHIFT 8
+#  define SATT2_CTRL_BRIDGE_HOST_EN_MSK   BIT(12)
+
+/* SATT Table Entry 2 SAP Base Address Register */
+#define SATT2_SAP_BA_REG                 0x1044
+/* SATT Table Entry 2 SAP Size Register. */
+#define SATT2_SAP_SIZE_REG               0x1048
+ /* SATT Table Entry 2 SAP Bridge Address - LSB Register */
+#define SATT2_BRG_BA_LSB_REG             0x104C
+
+/* Host High-level Interrupt Status Register */
+#define HHISR_REG                        0x2020
+/* Host High-level Interrupt Enable Register
+ *
+ * Resides in PCI memory space. This is the top hierarchy for
+ * interrupts from SeC to host, aggregating both interrupts that
+ * arrive through HICR registers as well as interrupts
+ * that arrive via IPC.
+ */
+#define HHIER_REG                        0x2024
+#define   IPC_HHIER_SEC	BIT(0)
+#define   IPC_HHIER_BRIDGE	BIT(1)
+#define   IPC_HHIER_MSK	(IPC_HHIER_SEC | IPC_HHIER_BRIDGE)
+
+/* Host High-level Interrupt Mask Register.
+ *
+ * Resides in PCI memory space.
+ * This is the top hierarchy for masking interrupts from SeC to host.
+ */
+#define HHIMR_REG                        0x2028
+#define   IPC_HHIMR_SEC       BIT(0)
+#define   IPC_HHIMR_BRIDGE    BIT(1)
+
+/* Host High-level IRQ Status Register */
+#define HHIRQSR_REG                      0x202C
+
+/* Host Interrupt Cause Register 0 - SeC IPC Readiness
+ *
+ * This register is both an ICR to Host from PCI Memory Space
+ * and it is also exposed in the SeC memory space.
+ * This register is used by SeC's IPC driver in order
+ * to synchronize with host about IPC interface state.
+ */
+#define HICR_SEC_IPC_READINESS_REG       0x2040
+#define   HICR_SEC_IPC_READINESS_HOST_RDY  BIT(0)
+#define   HICR_SEC_IPC_READINESS_SEC_RDY   BIT(1)
+#define   HICR_SEC_IPC_READINESS_SYS_RDY     \
+	  (HICR_SEC_IPC_READINESS_HOST_RDY | \
+	   HICR_SEC_IPC_READINESS_SEC_RDY)
+#define   HICR_SEC_IPC_READINESS_RDY_CLR   BIT(2)
+
+/* Host Interrupt Cause Register 1 - Aliveness Response */
+/* This register is both an ICR to Host from PCI Memory Space
+ * and it is also exposed in the SeC memory space.
+ * The register may be used by SeC to ACK a host request for aliveness.
+ */
+#define HICR_HOST_ALIVENESS_RESP_REG     0x2044
+#define   HICR_HOST_ALIVENESS_RESP_ACK    BIT(0)
+
+/* Host Interrupt Cause Register 2 - SeC IPC Output Doorbell */
+#define HICR_SEC_IPC_OUTPUT_DOORBELL_REG 0x2048
+
+/* Host Interrupt Status Register.
+ *
+ * Resides in PCI memory space.
+ * This is the main register involved in generating interrupts
+ * from SeC to host via HICRs.
+ * The interrupt generation rules are as follows:
+ * An interrupt will be generated whenever for any i,
+ * there is a transition from a state where at least one of
+ * the following conditions did not hold, to a state where
+ * ALL the following conditions hold:
+ * A) HISR.INT[i]_STS == 1.
+ * B) HIER.INT[i]_EN == 1.
+ */
+#define HISR_REG                         0x2060
+#define   HISR_INT_0_STS      BIT(0)
+#define   HISR_INT_1_STS      BIT(1)
+#define   HISR_INT_2_STS      BIT(2)
+#define   HISR_INT_3_STS      BIT(3)
+#define   HISR_INT_4_STS      BIT(4)
+#define   HISR_INT_5_STS      BIT(5)
+#define   HISR_INT_6_STS      BIT(6)
+#define   HISR_INT_7_STS      BIT(7)
+#define   HISR_INT_STS_MSK \
+	(HISR_INT_0_STS | HISR_INT_1_STS | HISR_INT_2_STS)
+
+/* Host Interrupt Enable Register. Resides in PCI memory space. */
+#define HIER_REG                         0x2064
+#define   HIER_INT_0_EN      BIT(0)
+#define   HIER_INT_1_EN      BIT(1)
+#define   HIER_INT_2_EN      BIT(2)
+#define   HIER_INT_3_EN      BIT(3)
+#define   HIER_INT_4_EN      BIT(4)
+#define   HIER_INT_5_EN      BIT(5)
+#define   HIER_INT_6_EN      BIT(6)
+#define   HIER_INT_7_EN      BIT(7)
+
+#define   HIER_INT_EN_MSK \
+	 (HIER_INT_0_EN | HIER_INT_1_EN | HIER_INT_2_EN)
+
+
+/* SEC Memory Space IPC output payload.
+ *
+ * This register is part of the output payload which SEC provides to host.
+ */
+#define BRIDGE_IPC_OUTPUT_PAYLOAD_REG    0x20C0
+
+/* SeC Interrupt Cause Register - Host Aliveness Request
+ * This register is both an ICR to SeC and it is also exposed
+ * in the host-visible PCI memory space.
+ * The register is used by host to request SeC aliveness.
+ */
+#define SICR_HOST_ALIVENESS_REQ_REG      0x214C
+#define   SICR_HOST_ALIVENESS_REQ_REQUESTED    BIT(0)
+
+
+/* SeC Interrupt Cause Register - Host IPC Readiness
+ *
+ * This register is both an ICR to SeC and it is also exposed
+ * in the host-visible PCI memory space.
+ * This register is used by the host's SeC driver uses in order
+ * to synchronize with SeC about IPC interface state.
+ */
+#define SICR_HOST_IPC_READINESS_REQ_REG  0x2150
+
+
+#define SICR_HOST_IPC_READINESS_HOST_RDY  BIT(0)
+#define SICR_HOST_IPC_READINESS_SEC_RDY   BIT(1)
+#define SICR_HOST_IPC_READINESS_SYS_RDY     \
+	(SICR_HOST_IPC_READINESS_HOST_RDY | \
+	 SICR_HOST_IPC_READINESS_SEC_RDY)
+#define SICR_HOST_IPC_READINESS_RDY_CLR   BIT(2)
+
+/* SeC Interrupt Cause Register - SeC IPC Output Status
+ *
+ * This register indicates whether or not processing of the most recent
+ * command has been completed by the Host.
+ * New commands and payloads should not be written by SeC until this
+ * register indicates that the previous command has been processed.
+ */
+#define SICR_SEC_IPC_OUTPUT_STATUS_REG   0x2154
+#  define SEC_IPC_OUTPUT_STATUS_RDY BIT(0)
+
+
+
+/*  MEI IPC Message payload size 64 bytes */
+#define PAYLOAD_SIZE        64
+
+/* MAX size for SATT range 32MB */
+#define SATT_RANGE_MAX     (32 << 20)
+
+
+#endif /* _MEI_HW_TXE_REGS_H_ */
+
diff --git a/drivers/misc/mei/hw-txe.c b/drivers/misc/mei/hw-txe.c
new file mode 100644
index 000000000..bae680c64
--- /dev/null
+++ b/drivers/misc/mei/hw-txe.c
@@ -0,0 +1,1242 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2013-2014, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#include <linux/pci.h>
+#include <linux/jiffies.h>
+#include <linux/ktime.h>
+#include <linux/delay.h>
+#include <linux/kthread.h>
+#include <linux/irqreturn.h>
+
+#include <linux/mei.h>
+
+#include "mei_dev.h"
+#include "hw-txe.h"
+#include "client.h"
+#include "hbm.h"
+
+/**
+ * mei_txe_reg_read - Reads 32bit data from the txe device
+ *
+ * @base_addr: registers base address
+ * @offset: register offset
+ *
+ * Return: register value
+ */
+static inline u32 mei_txe_reg_read(void __iomem *base_addr,
+					unsigned long offset)
+{
+	return ioread32(base_addr + offset);
+}
+
+/**
+ * mei_txe_reg_write - Writes 32bit data to the txe device
+ *
+ * @base_addr: registers base address
+ * @offset: register offset
+ * @value: the value to write
+ */
+static inline void mei_txe_reg_write(void __iomem *base_addr,
+				unsigned long offset, u32 value)
+{
+	iowrite32(value, base_addr + offset);
+}
+
+/**
+ * mei_txe_sec_reg_read_silent - Reads 32bit data from the SeC BAR
+ *
+ * @hw: the txe hardware structure
+ * @offset: register offset
+ *
+ * Doesn't check for aliveness while Reads 32bit data from the SeC BAR
+ *
+ * Return: register value
+ */
+static inline u32 mei_txe_sec_reg_read_silent(struct mei_txe_hw *hw,
+				unsigned long offset)
+{
+	return mei_txe_reg_read(hw->mem_addr[SEC_BAR], offset);
+}
+
+/**
+ * mei_txe_sec_reg_read - Reads 32bit data from the SeC BAR
+ *
+ * @hw: the txe hardware structure
+ * @offset: register offset
+ *
+ * Reads 32bit data from the SeC BAR and shout loud if aliveness is not set
+ *
+ * Return: register value
+ */
+static inline u32 mei_txe_sec_reg_read(struct mei_txe_hw *hw,
+				unsigned long offset)
+{
+	WARN(!hw->aliveness, "sec read: aliveness not asserted\n");
+	return mei_txe_sec_reg_read_silent(hw, offset);
+}
+/**
+ * mei_txe_sec_reg_write_silent - Writes 32bit data to the SeC BAR
+ *   doesn't check for aliveness
+ *
+ * @hw: the txe hardware structure
+ * @offset: register offset
+ * @value: value to write
+ *
+ * Doesn't check for aliveness while writes 32bit data from to the SeC BAR
+ */
+static inline void mei_txe_sec_reg_write_silent(struct mei_txe_hw *hw,
+				unsigned long offset, u32 value)
+{
+	mei_txe_reg_write(hw->mem_addr[SEC_BAR], offset, value);
+}
+
+/**
+ * mei_txe_sec_reg_write - Writes 32bit data to the SeC BAR
+ *
+ * @hw: the txe hardware structure
+ * @offset: register offset
+ * @value: value to write
+ *
+ * Writes 32bit data from the SeC BAR and shout loud if aliveness is not set
+ */
+static inline void mei_txe_sec_reg_write(struct mei_txe_hw *hw,
+				unsigned long offset, u32 value)
+{
+	WARN(!hw->aliveness, "sec write: aliveness not asserted\n");
+	mei_txe_sec_reg_write_silent(hw, offset, value);
+}
+/**
+ * mei_txe_br_reg_read - Reads 32bit data from the Bridge BAR
+ *
+ * @hw: the txe hardware structure
+ * @offset: offset from which to read the data
+ *
+ * Return: the byte read.
+ */
+static inline u32 mei_txe_br_reg_read(struct mei_txe_hw *hw,
+				unsigned long offset)
+{
+	return mei_txe_reg_read(hw->mem_addr[BRIDGE_BAR], offset);
+}
+
+/**
+ * mei_txe_br_reg_write - Writes 32bit data to the Bridge BAR
+ *
+ * @hw: the txe hardware structure
+ * @offset: offset from which to write the data
+ * @value: the byte to write
+ */
+static inline void mei_txe_br_reg_write(struct mei_txe_hw *hw,
+				unsigned long offset, u32 value)
+{
+	mei_txe_reg_write(hw->mem_addr[BRIDGE_BAR], offset, value);
+}
+
+/**
+ * mei_txe_aliveness_set - request for aliveness change
+ *
+ * @dev: the device structure
+ * @req: requested aliveness value
+ *
+ * Request for aliveness change and returns true if the change is
+ *   really needed and false if aliveness is already
+ *   in the requested state
+ *
+ * Locking: called under "dev->device_lock" lock
+ *
+ * Return: true if request was send
+ */
+static bool mei_txe_aliveness_set(struct mei_device *dev, u32 req)
+{
+
+	struct mei_txe_hw *hw = to_txe_hw(dev);
+	bool do_req = hw->aliveness != req;
+
+	dev_dbg(dev->dev, "Aliveness current=%d request=%d\n",
+				hw->aliveness, req);
+	if (do_req) {
+		dev->pg_event = MEI_PG_EVENT_WAIT;
+		mei_txe_br_reg_write(hw, SICR_HOST_ALIVENESS_REQ_REG, req);
+	}
+	return do_req;
+}
+
+
+/**
+ * mei_txe_aliveness_req_get - get aliveness requested register value
+ *
+ * @dev: the device structure
+ *
+ * Extract HICR_HOST_ALIVENESS_RESP_ACK bit from
+ * from HICR_HOST_ALIVENESS_REQ register value
+ *
+ * Return: SICR_HOST_ALIVENESS_REQ_REQUESTED bit value
+ */
+static u32 mei_txe_aliveness_req_get(struct mei_device *dev)
+{
+	struct mei_txe_hw *hw = to_txe_hw(dev);
+	u32 reg;
+
+	reg = mei_txe_br_reg_read(hw, SICR_HOST_ALIVENESS_REQ_REG);
+	return reg & SICR_HOST_ALIVENESS_REQ_REQUESTED;
+}
+
+/**
+ * mei_txe_aliveness_get - get aliveness response register value
+ *
+ * @dev: the device structure
+ *
+ * Return: HICR_HOST_ALIVENESS_RESP_ACK bit from HICR_HOST_ALIVENESS_RESP
+ *         register
+ */
+static u32 mei_txe_aliveness_get(struct mei_device *dev)
+{
+	struct mei_txe_hw *hw = to_txe_hw(dev);
+	u32 reg;
+
+	reg = mei_txe_br_reg_read(hw, HICR_HOST_ALIVENESS_RESP_REG);
+	return reg & HICR_HOST_ALIVENESS_RESP_ACK;
+}
+
+/**
+ * mei_txe_aliveness_poll - waits for aliveness to settle
+ *
+ * @dev: the device structure
+ * @expected: expected aliveness value
+ *
+ * Polls for HICR_HOST_ALIVENESS_RESP.ALIVENESS_RESP to be set
+ *
+ * Return: 0 if the expected value was received, -ETIME otherwise
+ */
+static int mei_txe_aliveness_poll(struct mei_device *dev, u32 expected)
+{
+	struct mei_txe_hw *hw = to_txe_hw(dev);
+	ktime_t stop, start;
+
+	start = ktime_get();
+	stop = ktime_add(start, ms_to_ktime(SEC_ALIVENESS_WAIT_TIMEOUT));
+	do {
+		hw->aliveness = mei_txe_aliveness_get(dev);
+		if (hw->aliveness == expected) {
+			dev->pg_event = MEI_PG_EVENT_IDLE;
+			dev_dbg(dev->dev, "aliveness settled after %lld usecs\n",
+				ktime_to_us(ktime_sub(ktime_get(), start)));
+			return 0;
+		}
+		usleep_range(20, 50);
+	} while (ktime_before(ktime_get(), stop));
+
+	dev->pg_event = MEI_PG_EVENT_IDLE;
+	dev_err(dev->dev, "aliveness timed out\n");
+	return -ETIME;
+}
+
+/**
+ * mei_txe_aliveness_wait - waits for aliveness to settle
+ *
+ * @dev: the device structure
+ * @expected: expected aliveness value
+ *
+ * Waits for HICR_HOST_ALIVENESS_RESP.ALIVENESS_RESP to be set
+ *
+ * Return: 0 on success and < 0 otherwise
+ */
+static int mei_txe_aliveness_wait(struct mei_device *dev, u32 expected)
+{
+	struct mei_txe_hw *hw = to_txe_hw(dev);
+	const unsigned long timeout =
+			msecs_to_jiffies(SEC_ALIVENESS_WAIT_TIMEOUT);
+	long err;
+	int ret;
+
+	hw->aliveness = mei_txe_aliveness_get(dev);
+	if (hw->aliveness == expected)
+		return 0;
+
+	mutex_unlock(&dev->device_lock);
+	err = wait_event_timeout(hw->wait_aliveness_resp,
+			dev->pg_event == MEI_PG_EVENT_RECEIVED, timeout);
+	mutex_lock(&dev->device_lock);
+
+	hw->aliveness = mei_txe_aliveness_get(dev);
+	ret = hw->aliveness == expected ? 0 : -ETIME;
+
+	if (ret)
+		dev_warn(dev->dev, "aliveness timed out = %ld aliveness = %d event = %d\n",
+			err, hw->aliveness, dev->pg_event);
+	else
+		dev_dbg(dev->dev, "aliveness settled after = %d msec aliveness = %d event = %d\n",
+			jiffies_to_msecs(timeout - err),
+			hw->aliveness, dev->pg_event);
+
+	dev->pg_event = MEI_PG_EVENT_IDLE;
+	return ret;
+}
+
+/**
+ * mei_txe_aliveness_set_sync - sets an wait for aliveness to complete
+ *
+ * @dev: the device structure
+ * @req: requested aliveness value
+ *
+ * Return: 0 on success and < 0 otherwise
+ */
+int mei_txe_aliveness_set_sync(struct mei_device *dev, u32 req)
+{
+	if (mei_txe_aliveness_set(dev, req))
+		return mei_txe_aliveness_wait(dev, req);
+	return 0;
+}
+
+/**
+ * mei_txe_pg_in_transition - is device now in pg transition
+ *
+ * @dev: the device structure
+ *
+ * Return: true if in pg transition, false otherwise
+ */
+static bool mei_txe_pg_in_transition(struct mei_device *dev)
+{
+	return dev->pg_event == MEI_PG_EVENT_WAIT;
+}
+
+/**
+ * mei_txe_pg_is_enabled - detect if PG is supported by HW
+ *
+ * @dev: the device structure
+ *
+ * Return: true is pg supported, false otherwise
+ */
+static bool mei_txe_pg_is_enabled(struct mei_device *dev)
+{
+	return true;
+}
+
+/**
+ * mei_txe_pg_state  - translate aliveness register value
+ *   to the mei power gating state
+ *
+ * @dev: the device structure
+ *
+ * Return: MEI_PG_OFF if aliveness is on and MEI_PG_ON otherwise
+ */
+static inline enum mei_pg_state mei_txe_pg_state(struct mei_device *dev)
+{
+	struct mei_txe_hw *hw = to_txe_hw(dev);
+
+	return hw->aliveness ? MEI_PG_OFF : MEI_PG_ON;
+}
+
+/**
+ * mei_txe_input_ready_interrupt_enable - sets the Input Ready Interrupt
+ *
+ * @dev: the device structure
+ */
+static void mei_txe_input_ready_interrupt_enable(struct mei_device *dev)
+{
+	struct mei_txe_hw *hw = to_txe_hw(dev);
+	u32 hintmsk;
+	/* Enable the SEC_IPC_HOST_INT_MASK_IN_RDY interrupt */
+	hintmsk = mei_txe_sec_reg_read(hw, SEC_IPC_HOST_INT_MASK_REG);
+	hintmsk |= SEC_IPC_HOST_INT_MASK_IN_RDY;
+	mei_txe_sec_reg_write(hw, SEC_IPC_HOST_INT_MASK_REG, hintmsk);
+}
+
+/**
+ * mei_txe_input_doorbell_set - sets bit 0 in
+ *    SEC_IPC_INPUT_DOORBELL.IPC_INPUT_DOORBELL.
+ *
+ * @hw: the txe hardware structure
+ */
+static void mei_txe_input_doorbell_set(struct mei_txe_hw *hw)
+{
+	/* Clear the interrupt cause */
+	clear_bit(TXE_INTR_IN_READY_BIT, &hw->intr_cause);
+	mei_txe_sec_reg_write(hw, SEC_IPC_INPUT_DOORBELL_REG, 1);
+}
+
+/**
+ * mei_txe_output_ready_set - Sets the SICR_SEC_IPC_OUTPUT_STATUS bit to 1
+ *
+ * @hw: the txe hardware structure
+ */
+static void mei_txe_output_ready_set(struct mei_txe_hw *hw)
+{
+	mei_txe_br_reg_write(hw,
+			SICR_SEC_IPC_OUTPUT_STATUS_REG,
+			SEC_IPC_OUTPUT_STATUS_RDY);
+}
+
+/**
+ * mei_txe_is_input_ready - check if TXE is ready for receiving data
+ *
+ * @dev: the device structure
+ *
+ * Return: true if INPUT STATUS READY bit is set
+ */
+static bool mei_txe_is_input_ready(struct mei_device *dev)
+{
+	struct mei_txe_hw *hw = to_txe_hw(dev);
+	u32 status;
+
+	status = mei_txe_sec_reg_read(hw, SEC_IPC_INPUT_STATUS_REG);
+	return !!(SEC_IPC_INPUT_STATUS_RDY & status);
+}
+
+/**
+ * mei_txe_intr_clear - clear all interrupts
+ *
+ * @dev: the device structure
+ */
+static inline void mei_txe_intr_clear(struct mei_device *dev)
+{
+	struct mei_txe_hw *hw = to_txe_hw(dev);
+
+	mei_txe_sec_reg_write_silent(hw, SEC_IPC_HOST_INT_STATUS_REG,
+		SEC_IPC_HOST_INT_STATUS_PENDING);
+	mei_txe_br_reg_write(hw, HISR_REG, HISR_INT_STS_MSK);
+	mei_txe_br_reg_write(hw, HHISR_REG, IPC_HHIER_MSK);
+}
+
+/**
+ * mei_txe_intr_disable - disable all interrupts
+ *
+ * @dev: the device structure
+ */
+static void mei_txe_intr_disable(struct mei_device *dev)
+{
+	struct mei_txe_hw *hw = to_txe_hw(dev);
+
+	mei_txe_br_reg_write(hw, HHIER_REG, 0);
+	mei_txe_br_reg_write(hw, HIER_REG, 0);
+}
+/**
+ * mei_txe_intr_enable - enable all interrupts
+ *
+ * @dev: the device structure
+ */
+static void mei_txe_intr_enable(struct mei_device *dev)
+{
+	struct mei_txe_hw *hw = to_txe_hw(dev);
+
+	mei_txe_br_reg_write(hw, HHIER_REG, IPC_HHIER_MSK);
+	mei_txe_br_reg_write(hw, HIER_REG, HIER_INT_EN_MSK);
+}
+
+/**
+ * mei_txe_pending_interrupts - check if there are pending interrupts
+ *	only Aliveness, Input ready, and output doorbell are of relevance
+ *
+ * @dev: the device structure
+ *
+ * Checks if there are pending interrupts
+ * only Aliveness, Readiness, Input ready, and Output doorbell are relevant
+ *
+ * Return: true if there are pending interrupts
+ */
+static bool mei_txe_pending_interrupts(struct mei_device *dev)
+{
+
+	struct mei_txe_hw *hw = to_txe_hw(dev);
+	bool ret = (hw->intr_cause & (TXE_INTR_READINESS |
+				      TXE_INTR_ALIVENESS |
+				      TXE_INTR_IN_READY  |
+				      TXE_INTR_OUT_DB));
+
+	if (ret) {
+		dev_dbg(dev->dev,
+			"Pending Interrupts InReady=%01d Readiness=%01d, Aliveness=%01d, OutDoor=%01d\n",
+			!!(hw->intr_cause & TXE_INTR_IN_READY),
+			!!(hw->intr_cause & TXE_INTR_READINESS),
+			!!(hw->intr_cause & TXE_INTR_ALIVENESS),
+			!!(hw->intr_cause & TXE_INTR_OUT_DB));
+	}
+	return ret;
+}
+
+/**
+ * mei_txe_input_payload_write - write a dword to the host buffer
+ *	at offset idx
+ *
+ * @dev: the device structure
+ * @idx: index in the host buffer
+ * @value: value
+ */
+static void mei_txe_input_payload_write(struct mei_device *dev,
+			unsigned long idx, u32 value)
+{
+	struct mei_txe_hw *hw = to_txe_hw(dev);
+
+	mei_txe_sec_reg_write(hw, SEC_IPC_INPUT_PAYLOAD_REG +
+			(idx * sizeof(u32)), value);
+}
+
+/**
+ * mei_txe_out_data_read - read dword from the device buffer
+ *	at offset idx
+ *
+ * @dev: the device structure
+ * @idx: index in the device buffer
+ *
+ * Return: register value at index
+ */
+static u32 mei_txe_out_data_read(const struct mei_device *dev,
+					unsigned long idx)
+{
+	struct mei_txe_hw *hw = to_txe_hw(dev);
+
+	return mei_txe_br_reg_read(hw,
+		BRIDGE_IPC_OUTPUT_PAYLOAD_REG + (idx * sizeof(u32)));
+}
+
+/* Readiness */
+
+/**
+ * mei_txe_readiness_set_host_rdy - set host readiness bit
+ *
+ * @dev: the device structure
+ */
+static void mei_txe_readiness_set_host_rdy(struct mei_device *dev)
+{
+	struct mei_txe_hw *hw = to_txe_hw(dev);
+
+	mei_txe_br_reg_write(hw,
+		SICR_HOST_IPC_READINESS_REQ_REG,
+		SICR_HOST_IPC_READINESS_HOST_RDY);
+}
+
+/**
+ * mei_txe_readiness_clear - clear host readiness bit
+ *
+ * @dev: the device structure
+ */
+static void mei_txe_readiness_clear(struct mei_device *dev)
+{
+	struct mei_txe_hw *hw = to_txe_hw(dev);
+
+	mei_txe_br_reg_write(hw, SICR_HOST_IPC_READINESS_REQ_REG,
+				SICR_HOST_IPC_READINESS_RDY_CLR);
+}
+/**
+ * mei_txe_readiness_get - Reads and returns
+ *	the HICR_SEC_IPC_READINESS register value
+ *
+ * @dev: the device structure
+ *
+ * Return: the HICR_SEC_IPC_READINESS register value
+ */
+static u32 mei_txe_readiness_get(struct mei_device *dev)
+{
+	struct mei_txe_hw *hw = to_txe_hw(dev);
+
+	return mei_txe_br_reg_read(hw, HICR_SEC_IPC_READINESS_REG);
+}
+
+
+/**
+ * mei_txe_readiness_is_sec_rdy - check readiness
+ *  for HICR_SEC_IPC_READINESS_SEC_RDY
+ *
+ * @readiness: cached readiness state
+ *
+ * Return: true if readiness bit is set
+ */
+static inline bool mei_txe_readiness_is_sec_rdy(u32 readiness)
+{
+	return !!(readiness & HICR_SEC_IPC_READINESS_SEC_RDY);
+}
+
+/**
+ * mei_txe_hw_is_ready - check if the hw is ready
+ *
+ * @dev: the device structure
+ *
+ * Return: true if sec is ready
+ */
+static bool mei_txe_hw_is_ready(struct mei_device *dev)
+{
+	u32 readiness =  mei_txe_readiness_get(dev);
+
+	return mei_txe_readiness_is_sec_rdy(readiness);
+}
+
+/**
+ * mei_txe_host_is_ready - check if the host is ready
+ *
+ * @dev: the device structure
+ *
+ * Return: true if host is ready
+ */
+static inline bool mei_txe_host_is_ready(struct mei_device *dev)
+{
+	struct mei_txe_hw *hw = to_txe_hw(dev);
+	u32 reg = mei_txe_br_reg_read(hw, HICR_SEC_IPC_READINESS_REG);
+
+	return !!(reg & HICR_SEC_IPC_READINESS_HOST_RDY);
+}
+
+/**
+ * mei_txe_readiness_wait - wait till readiness settles
+ *
+ * @dev: the device structure
+ *
+ * Return: 0 on success and -ETIME on timeout
+ */
+static int mei_txe_readiness_wait(struct mei_device *dev)
+{
+	if (mei_txe_hw_is_ready(dev))
+		return 0;
+
+	mutex_unlock(&dev->device_lock);
+	wait_event_timeout(dev->wait_hw_ready, dev->recvd_hw_ready,
+			msecs_to_jiffies(SEC_RESET_WAIT_TIMEOUT));
+	mutex_lock(&dev->device_lock);
+	if (!dev->recvd_hw_ready) {
+		dev_err(dev->dev, "wait for readiness failed\n");
+		return -ETIME;
+	}
+
+	dev->recvd_hw_ready = false;
+	return 0;
+}
+
+static const struct mei_fw_status mei_txe_fw_sts = {
+	.count = 2,
+	.status[0] = PCI_CFG_TXE_FW_STS0,
+	.status[1] = PCI_CFG_TXE_FW_STS1
+};
+
+/**
+ * mei_txe_fw_status - read fw status register from pci config space
+ *
+ * @dev: mei device
+ * @fw_status: fw status register values
+ *
+ * Return: 0 on success, error otherwise
+ */
+static int mei_txe_fw_status(struct mei_device *dev,
+			     struct mei_fw_status *fw_status)
+{
+	const struct mei_fw_status *fw_src = &mei_txe_fw_sts;
+	struct pci_dev *pdev = to_pci_dev(dev->dev);
+	int ret;
+	int i;
+
+	if (!fw_status)
+		return -EINVAL;
+
+	fw_status->count = fw_src->count;
+	for (i = 0; i < fw_src->count && i < MEI_FW_STATUS_MAX; i++) {
+		ret = pci_read_config_dword(pdev,
+			fw_src->status[i], &fw_status->status[i]);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+/**
+ *  mei_txe_hw_config - configure hardware at the start of the devices
+ *
+ * @dev: the device structure
+ *
+ * Configure hardware at the start of the device should be done only
+ *   once at the device probe time
+ */
+static void mei_txe_hw_config(struct mei_device *dev)
+{
+
+	struct mei_txe_hw *hw = to_txe_hw(dev);
+
+	/* Doesn't change in runtime */
+	dev->hbuf_depth = PAYLOAD_SIZE / 4;
+
+	hw->aliveness = mei_txe_aliveness_get(dev);
+	hw->readiness = mei_txe_readiness_get(dev);
+
+	dev_dbg(dev->dev, "aliveness_resp = 0x%08x, readiness = 0x%08x.\n",
+		hw->aliveness, hw->readiness);
+}
+
+
+/**
+ * mei_txe_write - writes a message to device.
+ *
+ * @dev: the device structure
+ * @header: header of message
+ * @buf: message buffer will be written
+ *
+ * Return: 0 if success, <0 - otherwise.
+ */
+
+static int mei_txe_write(struct mei_device *dev,
+		struct mei_msg_hdr *header, unsigned char *buf)
+{
+	struct mei_txe_hw *hw = to_txe_hw(dev);
+	unsigned long rem;
+	unsigned long length;
+	int slots = dev->hbuf_depth;
+	u32 *reg_buf = (u32 *)buf;
+	u32 dw_cnt;
+	int i;
+
+	if (WARN_ON(!header || !buf))
+		return -EINVAL;
+
+	length = header->length;
+
+	dev_dbg(dev->dev, MEI_HDR_FMT, MEI_HDR_PRM(header));
+
+	dw_cnt = mei_data2slots(length);
+	if (dw_cnt > slots)
+		return -EMSGSIZE;
+
+	if (WARN(!hw->aliveness, "txe write: aliveness not asserted\n"))
+		return -EAGAIN;
+
+	/* Enable Input Ready Interrupt. */
+	mei_txe_input_ready_interrupt_enable(dev);
+
+	if (!mei_txe_is_input_ready(dev)) {
+		char fw_sts_str[MEI_FW_STATUS_STR_SZ];
+
+		mei_fw_status_str(dev, fw_sts_str, MEI_FW_STATUS_STR_SZ);
+		dev_err(dev->dev, "Input is not ready %s\n", fw_sts_str);
+		return -EAGAIN;
+	}
+
+	mei_txe_input_payload_write(dev, 0, *((u32 *)header));
+
+	for (i = 0; i < length / 4; i++)
+		mei_txe_input_payload_write(dev, i + 1, reg_buf[i]);
+
+	rem = length & 0x3;
+	if (rem > 0) {
+		u32 reg = 0;
+
+		memcpy(&reg, &buf[length - rem], rem);
+		mei_txe_input_payload_write(dev, i + 1, reg);
+	}
+
+	/* after each write the whole buffer is consumed */
+	hw->slots = 0;
+
+	/* Set Input-Doorbell */
+	mei_txe_input_doorbell_set(hw);
+
+	return 0;
+}
+
+/**
+ * mei_txe_hbuf_max_len - mimics the me hbuf circular buffer
+ *
+ * @dev: the device structure
+ *
+ * Return: the PAYLOAD_SIZE - 4
+ */
+static size_t mei_txe_hbuf_max_len(const struct mei_device *dev)
+{
+	return PAYLOAD_SIZE - sizeof(struct mei_msg_hdr);
+}
+
+/**
+ * mei_txe_hbuf_empty_slots - mimics the me hbuf circular buffer
+ *
+ * @dev: the device structure
+ *
+ * Return: always hbuf_depth
+ */
+static int mei_txe_hbuf_empty_slots(struct mei_device *dev)
+{
+	struct mei_txe_hw *hw = to_txe_hw(dev);
+
+	return hw->slots;
+}
+
+/**
+ * mei_txe_count_full_read_slots - mimics the me device circular buffer
+ *
+ * @dev: the device structure
+ *
+ * Return: always buffer size in dwords count
+ */
+static int mei_txe_count_full_read_slots(struct mei_device *dev)
+{
+	/* read buffers has static size */
+	return  PAYLOAD_SIZE / 4;
+}
+
+/**
+ * mei_txe_read_hdr - read message header which is always in 4 first bytes
+ *
+ * @dev: the device structure
+ *
+ * Return: mei message header
+ */
+
+static u32 mei_txe_read_hdr(const struct mei_device *dev)
+{
+	return mei_txe_out_data_read(dev, 0);
+}
+/**
+ * mei_txe_read - reads a message from the txe device.
+ *
+ * @dev: the device structure
+ * @buf: message buffer will be written
+ * @len: message size will be read
+ *
+ * Return: -EINVAL on error wrong argument and 0 on success
+ */
+static int mei_txe_read(struct mei_device *dev,
+		unsigned char *buf, unsigned long len)
+{
+
+	struct mei_txe_hw *hw = to_txe_hw(dev);
+	u32 *reg_buf, reg;
+	u32 rem;
+	u32 i;
+
+	if (WARN_ON(!buf || !len))
+		return -EINVAL;
+
+	reg_buf = (u32 *)buf;
+	rem = len & 0x3;
+
+	dev_dbg(dev->dev, "buffer-length = %lu buf[0]0x%08X\n",
+		len, mei_txe_out_data_read(dev, 0));
+
+	for (i = 0; i < len / 4; i++) {
+		/* skip header: index starts from 1 */
+		reg = mei_txe_out_data_read(dev, i + 1);
+		dev_dbg(dev->dev, "buf[%d] = 0x%08X\n", i, reg);
+		*reg_buf++ = reg;
+	}
+
+	if (rem) {
+		reg = mei_txe_out_data_read(dev, i + 1);
+		memcpy(reg_buf, &reg, rem);
+	}
+
+	mei_txe_output_ready_set(hw);
+	return 0;
+}
+
+/**
+ * mei_txe_hw_reset - resets host and fw.
+ *
+ * @dev: the device structure
+ * @intr_enable: if interrupt should be enabled after reset.
+ *
+ * Return: 0 on success and < 0 in case of error
+ */
+static int mei_txe_hw_reset(struct mei_device *dev, bool intr_enable)
+{
+	struct mei_txe_hw *hw = to_txe_hw(dev);
+
+	u32 aliveness_req;
+	/*
+	 * read input doorbell to ensure consistency between  Bridge and SeC
+	 * return value might be garbage return
+	 */
+	(void)mei_txe_sec_reg_read_silent(hw, SEC_IPC_INPUT_DOORBELL_REG);
+
+	aliveness_req = mei_txe_aliveness_req_get(dev);
+	hw->aliveness = mei_txe_aliveness_get(dev);
+
+	/* Disable interrupts in this stage we will poll */
+	mei_txe_intr_disable(dev);
+
+	/*
+	 * If Aliveness Request and Aliveness Response are not equal then
+	 * wait for them to be equal
+	 * Since we might have interrupts disabled - poll for it
+	 */
+	if (aliveness_req != hw->aliveness)
+		if (mei_txe_aliveness_poll(dev, aliveness_req) < 0) {
+			dev_err(dev->dev, "wait for aliveness settle failed ... bailing out\n");
+			return -EIO;
+		}
+
+	/*
+	 * If Aliveness Request and Aliveness Response are set then clear them
+	 */
+	if (aliveness_req) {
+		mei_txe_aliveness_set(dev, 0);
+		if (mei_txe_aliveness_poll(dev, 0) < 0) {
+			dev_err(dev->dev, "wait for aliveness failed ... bailing out\n");
+			return -EIO;
+		}
+	}
+
+	/*
+	 * Set readiness RDY_CLR bit
+	 */
+	mei_txe_readiness_clear(dev);
+
+	return 0;
+}
+
+/**
+ * mei_txe_hw_start - start the hardware after reset
+ *
+ * @dev: the device structure
+ *
+ * Return: 0 on success an error code otherwise
+ */
+static int mei_txe_hw_start(struct mei_device *dev)
+{
+	struct mei_txe_hw *hw = to_txe_hw(dev);
+	int ret;
+
+	u32 hisr;
+
+	/* bring back interrupts */
+	mei_txe_intr_enable(dev);
+
+	ret = mei_txe_readiness_wait(dev);
+	if (ret < 0) {
+		dev_err(dev->dev, "waiting for readiness failed\n");
+		return ret;
+	}
+
+	/*
+	 * If HISR.INT2_STS interrupt status bit is set then clear it.
+	 */
+	hisr = mei_txe_br_reg_read(hw, HISR_REG);
+	if (hisr & HISR_INT_2_STS)
+		mei_txe_br_reg_write(hw, HISR_REG, HISR_INT_2_STS);
+
+	/* Clear the interrupt cause of OutputDoorbell */
+	clear_bit(TXE_INTR_OUT_DB_BIT, &hw->intr_cause);
+
+	ret = mei_txe_aliveness_set_sync(dev, 1);
+	if (ret < 0) {
+		dev_err(dev->dev, "wait for aliveness failed ... bailing out\n");
+		return ret;
+	}
+
+	/* enable input ready interrupts:
+	 * SEC_IPC_HOST_INT_MASK.IPC_INPUT_READY_INT_MASK
+	 */
+	mei_txe_input_ready_interrupt_enable(dev);
+
+
+	/*  Set the SICR_SEC_IPC_OUTPUT_STATUS.IPC_OUTPUT_READY bit */
+	mei_txe_output_ready_set(hw);
+
+	/* Set bit SICR_HOST_IPC_READINESS.HOST_RDY
+	 */
+	mei_txe_readiness_set_host_rdy(dev);
+
+	return 0;
+}
+
+/**
+ * mei_txe_check_and_ack_intrs - translate multi BAR interrupt into
+ *  single bit mask and acknowledge the interrupts
+ *
+ * @dev: the device structure
+ * @do_ack: acknowledge interrupts
+ *
+ * Return: true if found interrupts to process.
+ */
+static bool mei_txe_check_and_ack_intrs(struct mei_device *dev, bool do_ack)
+{
+	struct mei_txe_hw *hw = to_txe_hw(dev);
+	u32 hisr;
+	u32 hhisr;
+	u32 ipc_isr;
+	u32 aliveness;
+	bool generated;
+
+	/* read interrupt registers */
+	hhisr = mei_txe_br_reg_read(hw, HHISR_REG);
+	generated = (hhisr & IPC_HHIER_MSK);
+	if (!generated)
+		goto out;
+
+	hisr = mei_txe_br_reg_read(hw, HISR_REG);
+
+	aliveness = mei_txe_aliveness_get(dev);
+	if (hhisr & IPC_HHIER_SEC && aliveness)
+		ipc_isr = mei_txe_sec_reg_read_silent(hw,
+				SEC_IPC_HOST_INT_STATUS_REG);
+	else
+		ipc_isr = 0;
+
+	generated = generated ||
+		(hisr & HISR_INT_STS_MSK) ||
+		(ipc_isr & SEC_IPC_HOST_INT_STATUS_PENDING);
+
+	if (generated && do_ack) {
+		/* Save the interrupt causes */
+		hw->intr_cause |= hisr & HISR_INT_STS_MSK;
+		if (ipc_isr & SEC_IPC_HOST_INT_STATUS_IN_RDY)
+			hw->intr_cause |= TXE_INTR_IN_READY;
+
+
+		mei_txe_intr_disable(dev);
+		/* Clear the interrupts in hierarchy:
+		 * IPC and Bridge, than the High Level */
+		mei_txe_sec_reg_write_silent(hw,
+			SEC_IPC_HOST_INT_STATUS_REG, ipc_isr);
+		mei_txe_br_reg_write(hw, HISR_REG, hisr);
+		mei_txe_br_reg_write(hw, HHISR_REG, hhisr);
+	}
+
+out:
+	return generated;
+}
+
+/**
+ * mei_txe_irq_quick_handler - The ISR of the MEI device
+ *
+ * @irq: The irq number
+ * @dev_id: pointer to the device structure
+ *
+ * Return: IRQ_WAKE_THREAD if interrupt is designed for the device
+ *         IRQ_NONE otherwise
+ */
+irqreturn_t mei_txe_irq_quick_handler(int irq, void *dev_id)
+{
+	struct mei_device *dev = dev_id;
+
+	if (mei_txe_check_and_ack_intrs(dev, true))
+		return IRQ_WAKE_THREAD;
+	return IRQ_NONE;
+}
+
+
+/**
+ * mei_txe_irq_thread_handler - txe interrupt thread
+ *
+ * @irq: The irq number
+ * @dev_id: pointer to the device structure
+ *
+ * Return: IRQ_HANDLED
+ */
+irqreturn_t mei_txe_irq_thread_handler(int irq, void *dev_id)
+{
+	struct mei_device *dev = (struct mei_device *) dev_id;
+	struct mei_txe_hw *hw = to_txe_hw(dev);
+	struct mei_cl_cb complete_list;
+	s32 slots;
+	int rets = 0;
+
+	dev_dbg(dev->dev, "irq thread: Interrupt Registers HHISR|HISR|SEC=%02X|%04X|%02X\n",
+		mei_txe_br_reg_read(hw, HHISR_REG),
+		mei_txe_br_reg_read(hw, HISR_REG),
+		mei_txe_sec_reg_read_silent(hw, SEC_IPC_HOST_INT_STATUS_REG));
+
+
+	/* initialize our complete list */
+	mutex_lock(&dev->device_lock);
+	mei_io_list_init(&complete_list);
+
+	if (pci_dev_msi_enabled(to_pci_dev(dev->dev)))
+		mei_txe_check_and_ack_intrs(dev, true);
+
+	/* show irq events */
+	mei_txe_pending_interrupts(dev);
+
+	hw->aliveness = mei_txe_aliveness_get(dev);
+	hw->readiness = mei_txe_readiness_get(dev);
+
+	/* Readiness:
+	 * Detection of TXE driver going through reset
+	 * or TXE driver resetting the HECI interface.
+	 */
+	if (test_and_clear_bit(TXE_INTR_READINESS_BIT, &hw->intr_cause)) {
+		dev_dbg(dev->dev, "Readiness Interrupt was received...\n");
+
+		/* Check if SeC is going through reset */
+		if (mei_txe_readiness_is_sec_rdy(hw->readiness)) {
+			dev_dbg(dev->dev, "we need to start the dev.\n");
+			dev->recvd_hw_ready = true;
+		} else {
+			dev->recvd_hw_ready = false;
+			if (dev->dev_state != MEI_DEV_RESETTING) {
+
+				dev_warn(dev->dev, "FW not ready: resetting.\n");
+				schedule_work(&dev->reset_work);
+				goto end;
+
+			}
+		}
+		wake_up(&dev->wait_hw_ready);
+	}
+
+	/************************************************************/
+	/* Check interrupt cause:
+	 * Aliveness: Detection of SeC acknowledge of host request that
+	 * it remain alive or host cancellation of that request.
+	 */
+
+	if (test_and_clear_bit(TXE_INTR_ALIVENESS_BIT, &hw->intr_cause)) {
+		/* Clear the interrupt cause */
+		dev_dbg(dev->dev,
+			"Aliveness Interrupt: Status: %d\n", hw->aliveness);
+		dev->pg_event = MEI_PG_EVENT_RECEIVED;
+		if (waitqueue_active(&hw->wait_aliveness_resp))
+			wake_up(&hw->wait_aliveness_resp);
+	}
+
+
+	/* Output Doorbell:
+	 * Detection of SeC having sent output to host
+	 */
+	slots = mei_count_full_read_slots(dev);
+	if (test_and_clear_bit(TXE_INTR_OUT_DB_BIT, &hw->intr_cause)) {
+		/* Read from TXE */
+		rets = mei_irq_read_handler(dev, &complete_list, &slots);
+		if (rets && dev->dev_state != MEI_DEV_RESETTING) {
+			dev_err(dev->dev,
+				"mei_irq_read_handler ret = %d.\n", rets);
+
+			schedule_work(&dev->reset_work);
+			goto end;
+		}
+	}
+	/* Input Ready: Detection if host can write to SeC */
+	if (test_and_clear_bit(TXE_INTR_IN_READY_BIT, &hw->intr_cause)) {
+		dev->hbuf_is_ready = true;
+		hw->slots = dev->hbuf_depth;
+	}
+
+	if (hw->aliveness && dev->hbuf_is_ready) {
+		/* get the real register value */
+		dev->hbuf_is_ready = mei_hbuf_is_ready(dev);
+		rets = mei_irq_write_handler(dev, &complete_list);
+		if (rets && rets != -EMSGSIZE)
+			dev_err(dev->dev, "mei_irq_write_handler ret = %d.\n",
+				rets);
+		dev->hbuf_is_ready = mei_hbuf_is_ready(dev);
+	}
+
+	mei_irq_compl_handler(dev, &complete_list);
+
+end:
+	dev_dbg(dev->dev, "interrupt thread end ret = %d\n", rets);
+
+	mutex_unlock(&dev->device_lock);
+
+	mei_enable_interrupts(dev);
+	return IRQ_HANDLED;
+}
+
+static const struct mei_hw_ops mei_txe_hw_ops = {
+
+	.host_is_ready = mei_txe_host_is_ready,
+
+	.fw_status = mei_txe_fw_status,
+	.pg_state = mei_txe_pg_state,
+
+	.hw_is_ready = mei_txe_hw_is_ready,
+	.hw_reset = mei_txe_hw_reset,
+	.hw_config = mei_txe_hw_config,
+	.hw_start = mei_txe_hw_start,
+
+	.pg_in_transition = mei_txe_pg_in_transition,
+	.pg_is_enabled = mei_txe_pg_is_enabled,
+
+	.intr_clear = mei_txe_intr_clear,
+	.intr_enable = mei_txe_intr_enable,
+	.intr_disable = mei_txe_intr_disable,
+
+	.hbuf_free_slots = mei_txe_hbuf_empty_slots,
+	.hbuf_is_ready = mei_txe_is_input_ready,
+	.hbuf_max_len = mei_txe_hbuf_max_len,
+
+	.write = mei_txe_write,
+
+	.rdbuf_full_slots = mei_txe_count_full_read_slots,
+	.read_hdr = mei_txe_read_hdr,
+
+	.read = mei_txe_read,
+
+};
+
+/**
+ * mei_txe_dev_init - allocates and initializes txe hardware specific structure
+ *
+ * @pdev: pci device
+ *
+ * Return: struct mei_device * on success or NULL
+ */
+struct mei_device *mei_txe_dev_init(struct pci_dev *pdev)
+{
+	struct mei_device *dev;
+	struct mei_txe_hw *hw;
+
+	dev = kzalloc(sizeof(struct mei_device) +
+			 sizeof(struct mei_txe_hw), GFP_KERNEL);
+	if (!dev)
+		return NULL;
+
+	mei_device_init(dev, &pdev->dev, &mei_txe_hw_ops);
+
+	hw = to_txe_hw(dev);
+
+	init_waitqueue_head(&hw->wait_aliveness_resp);
+
+	return dev;
+}
+
+/**
+ * mei_txe_setup_satt2 - SATT2 configuration for DMA support.
+ *
+ * @dev:   the device structure
+ * @addr:  physical address start of the range
+ * @range: physical range size
+ *
+ * Return: 0 on success an error code otherwise
+ */
+int mei_txe_setup_satt2(struct mei_device *dev, phys_addr_t addr, u32 range)
+{
+	struct mei_txe_hw *hw = to_txe_hw(dev);
+
+	u32 lo32 = lower_32_bits(addr);
+	u32 hi32 = upper_32_bits(addr);
+	u32 ctrl;
+
+	/* SATT is limited to 36 Bits */
+	if (hi32 & ~0xF)
+		return -EINVAL;
+
+	/* SATT has to be 16Byte aligned */
+	if (lo32 & 0xF)
+		return -EINVAL;
+
+	/* SATT range has to be 4Bytes aligned */
+	if (range & 0x4)
+		return -EINVAL;
+
+	/* SATT is limited to 32 MB range*/
+	if (range > SATT_RANGE_MAX)
+		return -EINVAL;
+
+	ctrl = SATT2_CTRL_VALID_MSK;
+	ctrl |= hi32  << SATT2_CTRL_BR_BASE_ADDR_REG_SHIFT;
+
+	mei_txe_br_reg_write(hw, SATT2_SAP_SIZE_REG, range);
+	mei_txe_br_reg_write(hw, SATT2_BRG_BA_LSB_REG, lo32);
+	mei_txe_br_reg_write(hw, SATT2_CTRL_REG, ctrl);
+	dev_dbg(dev->dev, "SATT2: SAP_SIZE_OFFSET=0x%08X, BRG_BA_LSB_OFFSET=0x%08X, CTRL_OFFSET=0x%08X\n",
+		range, lo32, ctrl);
+
+	return 0;
+}
diff --git a/drivers/misc/mei/hw-txe.h b/drivers/misc/mei/hw-txe.h
new file mode 100644
index 000000000..ce3ed0b88
--- /dev/null
+++ b/drivers/misc/mei/hw-txe.h
@@ -0,0 +1,75 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2013-2014, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#ifndef _MEI_HW_TXE_H_
+#define _MEI_HW_TXE_H_
+
+#include <linux/irqreturn.h>
+
+#include "hw.h"
+#include "hw-txe-regs.h"
+
+#define MEI_TXI_RPM_TIMEOUT    500 /* ms */
+
+/* Flatten Hierarchy interrupt cause */
+#define TXE_INTR_READINESS_BIT  0 /* HISR_INT_0_STS */
+#define TXE_INTR_READINESS      HISR_INT_0_STS
+#define TXE_INTR_ALIVENESS_BIT  1 /* HISR_INT_1_STS */
+#define TXE_INTR_ALIVENESS      HISR_INT_1_STS
+#define TXE_INTR_OUT_DB_BIT     2 /* HISR_INT_2_STS */
+#define TXE_INTR_OUT_DB         HISR_INT_2_STS
+#define TXE_INTR_IN_READY_BIT   8 /* beyond HISR */
+#define TXE_INTR_IN_READY       BIT(8)
+
+/**
+ * struct mei_txe_hw - txe hardware specifics
+ *
+ * @mem_addr:            SeC and BRIDGE bars
+ * @aliveness:           aliveness (power gating) state of the hardware
+ * @readiness:           readiness state of the hardware
+ * @slots:               number of empty slots
+ * @wait_aliveness_resp: aliveness wait queue
+ * @intr_cause:          translated interrupt cause
+ */
+struct mei_txe_hw {
+	void __iomem *mem_addr[NUM_OF_MEM_BARS];
+	u32 aliveness;
+	u32 readiness;
+	u32 slots;
+
+	wait_queue_head_t wait_aliveness_resp;
+
+	unsigned long intr_cause;
+};
+
+#define to_txe_hw(dev) (struct mei_txe_hw *)((dev)->hw)
+
+static inline struct mei_device *hw_txe_to_mei(struct mei_txe_hw *hw)
+{
+	return container_of((void *)hw, struct mei_device, hw);
+}
+
+struct mei_device *mei_txe_dev_init(struct pci_dev *pdev);
+
+irqreturn_t mei_txe_irq_quick_handler(int irq, void *dev_id);
+irqreturn_t mei_txe_irq_thread_handler(int irq, void *dev_id);
+
+int mei_txe_aliveness_set_sync(struct mei_device *dev, u32 req);
+
+int mei_txe_setup_satt2(struct mei_device *dev, phys_addr_t addr, u32 range);
+
+
+#endif /* _MEI_HW_TXE_H_ */
diff --git a/drivers/misc/mei/hw.h b/drivers/misc/mei/hw.h
new file mode 100644
index 000000000..16fef6dc4
--- /dev/null
+++ b/drivers/misc/mei/hw.h
@@ -0,0 +1,302 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2003-2012, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#ifndef _MEI_HW_TYPES_H_
+#define _MEI_HW_TYPES_H_
+
+#include <linux/uuid.h>
+
+/*
+ * Timeouts in Seconds
+ */
+#define MEI_HW_READY_TIMEOUT        2  /* Timeout on ready message */
+#define MEI_CONNECT_TIMEOUT         3  /* HPS: at least 2 seconds */
+
+#define MEI_CL_CONNECT_TIMEOUT     15  /* HPS: Client Connect Timeout */
+#define MEI_CLIENTS_INIT_TIMEOUT   15  /* HPS: Clients Enumeration Timeout */
+
+#define MEI_IAMTHIF_STALL_TIMER    12  /* HPS */
+#define MEI_IAMTHIF_READ_TIMER     10  /* HPS */
+
+#define MEI_PGI_TIMEOUT            1  /* PG Isolation time response 1 sec */
+#define MEI_HBM_TIMEOUT            1   /* 1 second */
+
+/*
+ * MEI Version
+ */
+#define HBM_MINOR_VERSION                   1
+#define HBM_MAJOR_VERSION                   1
+
+/*
+ * MEI version with PGI support
+ */
+#define HBM_MINOR_VERSION_PGI               1
+#define HBM_MAJOR_VERSION_PGI               1
+
+/* Host bus message command opcode */
+#define MEI_HBM_CMD_OP_MSK                  0x7f
+/* Host bus message command RESPONSE */
+#define MEI_HBM_CMD_RES_MSK                 0x80
+
+/*
+ * MEI Bus Message Command IDs
+ */
+#define HOST_START_REQ_CMD                  0x01
+#define HOST_START_RES_CMD                  0x81
+
+#define HOST_STOP_REQ_CMD                   0x02
+#define HOST_STOP_RES_CMD                   0x82
+
+#define ME_STOP_REQ_CMD                     0x03
+
+#define HOST_ENUM_REQ_CMD                   0x04
+#define HOST_ENUM_RES_CMD                   0x84
+
+#define HOST_CLIENT_PROPERTIES_REQ_CMD      0x05
+#define HOST_CLIENT_PROPERTIES_RES_CMD      0x85
+
+#define CLIENT_CONNECT_REQ_CMD              0x06
+#define CLIENT_CONNECT_RES_CMD              0x86
+
+#define CLIENT_DISCONNECT_REQ_CMD           0x07
+#define CLIENT_DISCONNECT_RES_CMD           0x87
+
+#define MEI_FLOW_CONTROL_CMD                0x08
+
+#define MEI_PG_ISOLATION_ENTRY_REQ_CMD      0x0a
+#define MEI_PG_ISOLATION_ENTRY_RES_CMD      0x8a
+#define MEI_PG_ISOLATION_EXIT_REQ_CMD       0x0b
+#define MEI_PG_ISOLATION_EXIT_RES_CMD       0x8b
+
+/*
+ * MEI Stop Reason
+ * used by hbm_host_stop_request.reason
+ */
+enum mei_stop_reason_types {
+	DRIVER_STOP_REQUEST = 0x00,
+	DEVICE_D1_ENTRY = 0x01,
+	DEVICE_D2_ENTRY = 0x02,
+	DEVICE_D3_ENTRY = 0x03,
+	SYSTEM_S1_ENTRY = 0x04,
+	SYSTEM_S2_ENTRY = 0x05,
+	SYSTEM_S3_ENTRY = 0x06,
+	SYSTEM_S4_ENTRY = 0x07,
+	SYSTEM_S5_ENTRY = 0x08
+};
+
+
+/**
+ * enum mei_hbm_status  - mei host bus messages return values
+ *
+ * @MEI_HBMS_SUCCESS           : status success
+ * @MEI_HBMS_CLIENT_NOT_FOUND  : client not found
+ * @MEI_HBMS_ALREADY_EXISTS    : connection already established
+ * @MEI_HBMS_REJECTED          : connection is rejected
+ * @MEI_HBMS_INVALID_PARAMETER : invalid parameter
+ * @MEI_HBMS_NOT_ALLOWED       : operation not allowed
+ * @MEI_HBMS_ALREADY_STARTED   : system is already started
+ * @MEI_HBMS_NOT_STARTED       : system not started
+ *
+ * @MEI_HBMS_MAX               : sentinel
+ */
+enum mei_hbm_status {
+	MEI_HBMS_SUCCESS           = 0,
+	MEI_HBMS_CLIENT_NOT_FOUND  = 1,
+	MEI_HBMS_ALREADY_EXISTS    = 2,
+	MEI_HBMS_REJECTED          = 3,
+	MEI_HBMS_INVALID_PARAMETER = 4,
+	MEI_HBMS_NOT_ALLOWED       = 5,
+	MEI_HBMS_ALREADY_STARTED   = 6,
+	MEI_HBMS_NOT_STARTED       = 7,
+
+	MEI_HBMS_MAX
+};
+
+
+/*
+ * Client Connect Status
+ * used by hbm_client_connect_response.status
+ */
+enum mei_cl_connect_status {
+	MEI_CL_CONN_SUCCESS          = MEI_HBMS_SUCCESS,
+	MEI_CL_CONN_NOT_FOUND        = MEI_HBMS_CLIENT_NOT_FOUND,
+	MEI_CL_CONN_ALREADY_STARTED  = MEI_HBMS_ALREADY_EXISTS,
+	MEI_CL_CONN_OUT_OF_RESOURCES = MEI_HBMS_REJECTED,
+	MEI_CL_CONN_MESSAGE_SMALL    = MEI_HBMS_INVALID_PARAMETER,
+};
+
+/*
+ * Client Disconnect Status
+ */
+enum  mei_cl_disconnect_status {
+	MEI_CL_DISCONN_SUCCESS = MEI_HBMS_SUCCESS
+};
+
+/*
+ *  MEI BUS Interface Section
+ */
+struct mei_msg_hdr {
+	u32 me_addr:8;
+	u32 host_addr:8;
+	u32 length:9;
+	u32 reserved:5;
+	u32 internal:1;
+	u32 msg_complete:1;
+} __packed;
+
+
+struct mei_bus_message {
+	u8 hbm_cmd;
+	u8 data[0];
+} __packed;
+
+/**
+ * struct hbm_cl_cmd - client specific host bus command
+ *	CONNECT, DISCONNECT, and FlOW CONTROL
+ *
+ * @hbm_cmd: bus message command header
+ * @me_addr: address of the client in ME
+ * @host_addr: address of the client in the driver
+ * @data: generic data
+ */
+struct mei_hbm_cl_cmd {
+	u8 hbm_cmd;
+	u8 me_addr;
+	u8 host_addr;
+	u8 data;
+};
+
+struct hbm_version {
+	u8 minor_version;
+	u8 major_version;
+} __packed;
+
+struct hbm_host_version_request {
+	u8 hbm_cmd;
+	u8 reserved;
+	struct hbm_version host_version;
+} __packed;
+
+struct hbm_host_version_response {
+	u8 hbm_cmd;
+	u8 host_version_supported;
+	struct hbm_version me_max_version;
+} __packed;
+
+struct hbm_host_stop_request {
+	u8 hbm_cmd;
+	u8 reason;
+	u8 reserved[2];
+} __packed;
+
+struct hbm_host_stop_response {
+	u8 hbm_cmd;
+	u8 reserved[3];
+} __packed;
+
+struct hbm_me_stop_request {
+	u8 hbm_cmd;
+	u8 reason;
+	u8 reserved[2];
+} __packed;
+
+struct hbm_host_enum_request {
+	u8 hbm_cmd;
+	u8 reserved[3];
+} __packed;
+
+struct hbm_host_enum_response {
+	u8 hbm_cmd;
+	u8 reserved[3];
+	u8 valid_addresses[32];
+} __packed;
+
+struct mei_client_properties {
+	uuid_le protocol_name;
+	u8 protocol_version;
+	u8 max_number_of_connections;
+	u8 fixed_address;
+	u8 single_recv_buf;
+	u32 max_msg_length;
+} __packed;
+
+struct hbm_props_request {
+	u8 hbm_cmd;
+	u8 me_addr;
+	u8 reserved[2];
+} __packed;
+
+struct hbm_props_response {
+	u8 hbm_cmd;
+	u8 me_addr;
+	u8 status;
+	u8 reserved[1];
+	struct mei_client_properties client_properties;
+} __packed;
+
+/**
+ * struct hbm_power_gate - power gate request/response
+ *
+ * @hbm_cmd: bus message command header
+ * @reserved: reserved
+ */
+struct hbm_power_gate {
+	u8 hbm_cmd;
+	u8 reserved[3];
+} __packed;
+
+/**
+ * struct hbm_client_connect_request - connect/disconnect request
+ *
+ * @hbm_cmd: bus message command header
+ * @me_addr: address of the client in ME
+ * @host_addr: address of the client in the driver
+ * @reserved: reserved
+ */
+struct hbm_client_connect_request {
+	u8 hbm_cmd;
+	u8 me_addr;
+	u8 host_addr;
+	u8 reserved;
+} __packed;
+
+/**
+ * struct hbm_client_connect_response - connect/disconnect response
+ *
+ * @hbm_cmd: bus message command header
+ * @me_addr: address of the client in ME
+ * @host_addr: address of the client in the driver
+ * @status: status of the request
+ */
+struct hbm_client_connect_response {
+	u8 hbm_cmd;
+	u8 me_addr;
+	u8 host_addr;
+	u8 status;
+} __packed;
+
+
+#define MEI_FC_MESSAGE_RESERVED_LENGTH           5
+
+struct hbm_flow_control {
+	u8 hbm_cmd;
+	u8 me_addr;
+	u8 host_addr;
+	u8 reserved[MEI_FC_MESSAGE_RESERVED_LENGTH];
+} __packed;
+
+
+#endif
diff --git a/drivers/misc/mei/init.c b/drivers/misc/mei/init.c
new file mode 100644
index 000000000..97353cf8d
--- /dev/null
+++ b/drivers/misc/mei/init.c
@@ -0,0 +1,428 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2003-2012, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#include <linux/export.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/delay.h>
+
+#include <linux/mei.h>
+
+#include "mei_dev.h"
+#include "hbm.h"
+#include "client.h"
+
+const char *mei_dev_state_str(int state)
+{
+#define MEI_DEV_STATE(state) case MEI_DEV_##state: return #state
+	switch (state) {
+	MEI_DEV_STATE(INITIALIZING);
+	MEI_DEV_STATE(INIT_CLIENTS);
+	MEI_DEV_STATE(ENABLED);
+	MEI_DEV_STATE(RESETTING);
+	MEI_DEV_STATE(DISABLED);
+	MEI_DEV_STATE(POWER_DOWN);
+	MEI_DEV_STATE(POWER_UP);
+	default:
+		return "unknown";
+	}
+#undef MEI_DEV_STATE
+}
+
+const char *mei_pg_state_str(enum mei_pg_state state)
+{
+#define MEI_PG_STATE(state) case MEI_PG_##state: return #state
+	switch (state) {
+	MEI_PG_STATE(OFF);
+	MEI_PG_STATE(ON);
+	default:
+		return "unknown";
+	}
+#undef MEI_PG_STATE
+}
+
+/**
+ * mei_fw_status2str - convert fw status registers to printable string
+ *
+ * @fw_status:  firmware status
+ * @buf: string buffer at minimal size MEI_FW_STATUS_STR_SZ
+ * @len: buffer len must be >= MEI_FW_STATUS_STR_SZ
+ *
+ * Return: number of bytes written or -EINVAL if buffer is to small
+ */
+ssize_t mei_fw_status2str(struct mei_fw_status *fw_status,
+			  char *buf, size_t len)
+{
+	ssize_t cnt = 0;
+	int i;
+
+	buf[0] = '\0';
+
+	if (len < MEI_FW_STATUS_STR_SZ)
+		return -EINVAL;
+
+	for (i = 0; i < fw_status->count; i++)
+		cnt += scnprintf(buf + cnt, len - cnt, "%08X ",
+				fw_status->status[i]);
+
+	/* drop last space */
+	buf[cnt] = '\0';
+	return cnt;
+}
+EXPORT_SYMBOL_GPL(mei_fw_status2str);
+
+/**
+ * mei_cancel_work - Cancel mei background jobs
+ *
+ * @dev: the device structure
+ */
+void mei_cancel_work(struct mei_device *dev)
+{
+	cancel_work_sync(&dev->init_work);
+	cancel_work_sync(&dev->reset_work);
+
+	cancel_delayed_work(&dev->timer_work);
+}
+EXPORT_SYMBOL_GPL(mei_cancel_work);
+
+/**
+ * mei_reset - resets host and fw.
+ *
+ * @dev: the device structure
+ *
+ * Return: 0 on success or < 0 if the reset hasn't succeeded
+ */
+int mei_reset(struct mei_device *dev)
+{
+	enum mei_dev_state state = dev->dev_state;
+	bool interrupts_enabled;
+	int ret;
+
+	if (state != MEI_DEV_INITIALIZING &&
+	    state != MEI_DEV_DISABLED &&
+	    state != MEI_DEV_POWER_DOWN &&
+	    state != MEI_DEV_POWER_UP) {
+		char fw_sts_str[MEI_FW_STATUS_STR_SZ];
+
+		mei_fw_status_str(dev, fw_sts_str, MEI_FW_STATUS_STR_SZ);
+		dev_warn(dev->dev, "unexpected reset: dev_state = %s fw status = %s\n",
+			 mei_dev_state_str(state), fw_sts_str);
+	}
+
+	/* we're already in reset, cancel the init timer
+	 * if the reset was called due the hbm protocol error
+	 * we need to call it before hw start
+	 * so the hbm watchdog won't kick in
+	 */
+	mei_hbm_idle(dev);
+
+	/* enter reset flow */
+	interrupts_enabled = state != MEI_DEV_POWER_DOWN;
+	dev->dev_state = MEI_DEV_RESETTING;
+
+	dev->reset_count++;
+	if (dev->reset_count > MEI_MAX_CONSEC_RESET) {
+		dev_err(dev->dev, "reset: reached maximal consecutive resets: disabling the device\n");
+		dev->dev_state = MEI_DEV_DISABLED;
+		return -ENODEV;
+	}
+
+	ret = mei_hw_reset(dev, interrupts_enabled);
+	/* fall through and remove the sw state even if hw reset has failed */
+
+	/* no need to clean up software state in case of power up */
+	if (state != MEI_DEV_INITIALIZING &&
+	    state != MEI_DEV_POWER_UP) {
+
+		/* remove all waiting requests */
+		mei_cl_all_write_clear(dev);
+
+		mei_cl_all_disconnect(dev);
+
+		/* wake up all readers and writers so they can be interrupted */
+		mei_cl_all_wakeup(dev);
+
+		/* remove entry if already in list */
+		dev_dbg(dev->dev, "remove iamthif and wd from the file list.\n");
+		mei_cl_unlink(&dev->wd_cl);
+		mei_cl_unlink(&dev->iamthif_cl);
+		mei_amthif_reset_params(dev);
+	}
+
+	mei_hbm_reset(dev);
+
+	dev->rd_msg_hdr = 0;
+	dev->wd_pending = false;
+
+	if (ret) {
+		dev_err(dev->dev, "hw_reset failed ret = %d\n", ret);
+		return ret;
+	}
+
+	if (state == MEI_DEV_POWER_DOWN) {
+		dev_dbg(dev->dev, "powering down: end of reset\n");
+		dev->dev_state = MEI_DEV_DISABLED;
+		return 0;
+	}
+
+	ret = mei_hw_start(dev);
+	if (ret) {
+		dev_err(dev->dev, "hw_start failed ret = %d\n", ret);
+		return ret;
+	}
+
+	dev_dbg(dev->dev, "link is established start sending messages.\n");
+
+	dev->dev_state = MEI_DEV_INIT_CLIENTS;
+	ret = mei_hbm_start_req(dev);
+	if (ret) {
+		dev_err(dev->dev, "hbm_start failed ret = %d\n", ret);
+		dev->dev_state = MEI_DEV_RESETTING;
+		return ret;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mei_reset);
+
+/**
+ * mei_start - initializes host and fw to start work.
+ *
+ * @dev: the device structure
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+int mei_start(struct mei_device *dev)
+{
+	int ret;
+
+	mutex_lock(&dev->device_lock);
+
+	/* acknowledge interrupt and stop interrupts */
+	mei_clear_interrupts(dev);
+
+	mei_hw_config(dev);
+
+	dev_dbg(dev->dev, "reset in start the mei device.\n");
+
+	dev->reset_count = 0;
+	do {
+		dev->dev_state = MEI_DEV_INITIALIZING;
+		ret = mei_reset(dev);
+
+		if (ret == -ENODEV || dev->dev_state == MEI_DEV_DISABLED) {
+			dev_err(dev->dev, "reset failed ret = %d", ret);
+			goto err;
+		}
+	} while (ret);
+
+	/* we cannot start the device w/o hbm start message completed */
+	if (dev->dev_state == MEI_DEV_DISABLED) {
+		dev_err(dev->dev, "reset failed");
+		goto err;
+	}
+
+	if (mei_hbm_start_wait(dev)) {
+		dev_err(dev->dev, "HBM haven't started");
+		goto err;
+	}
+
+	if (!mei_host_is_ready(dev)) {
+		dev_err(dev->dev, "host is not ready.\n");
+		goto err;
+	}
+
+	if (!mei_hw_is_ready(dev)) {
+		dev_err(dev->dev, "ME is not ready.\n");
+		goto err;
+	}
+
+	if (!mei_hbm_version_is_supported(dev)) {
+		dev_dbg(dev->dev, "MEI start failed.\n");
+		goto err;
+	}
+
+	dev_dbg(dev->dev, "link layer has been established.\n");
+
+	mutex_unlock(&dev->device_lock);
+	return 0;
+err:
+	dev_err(dev->dev, "link layer initialization failed.\n");
+	dev->dev_state = MEI_DEV_DISABLED;
+	mutex_unlock(&dev->device_lock);
+	return -ENODEV;
+}
+EXPORT_SYMBOL_GPL(mei_start);
+
+/**
+ * mei_restart - restart device after suspend
+ *
+ * @dev: the device structure
+ *
+ * Return: 0 on success or -ENODEV if the restart hasn't succeeded
+ */
+int mei_restart(struct mei_device *dev)
+{
+	int err;
+
+	mutex_lock(&dev->device_lock);
+
+	mei_clear_interrupts(dev);
+
+	dev->dev_state = MEI_DEV_POWER_UP;
+	dev->reset_count = 0;
+
+	err = mei_reset(dev);
+
+	mutex_unlock(&dev->device_lock);
+
+	if (err == -ENODEV || dev->dev_state == MEI_DEV_DISABLED) {
+		dev_err(dev->dev, "device disabled = %d\n", err);
+		return -ENODEV;
+	}
+
+	/* try to start again */
+	if (err)
+		schedule_work(&dev->reset_work);
+
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mei_restart);
+
+static void mei_reset_work(struct work_struct *work)
+{
+	struct mei_device *dev =
+		container_of(work, struct mei_device,  reset_work);
+	int ret;
+
+	mutex_lock(&dev->device_lock);
+
+	ret = mei_reset(dev);
+
+	mutex_unlock(&dev->device_lock);
+
+	if (dev->dev_state == MEI_DEV_DISABLED) {
+		dev_err(dev->dev, "device disabled = %d\n", ret);
+		return;
+	}
+
+	/* retry reset in case of failure */
+	if (ret)
+		schedule_work(&dev->reset_work);
+}
+
+void mei_stop(struct mei_device *dev)
+{
+	dev_dbg(dev->dev, "stopping the device.\n");
+
+	mei_cancel_work(dev);
+
+	mei_nfc_host_exit(dev);
+
+	mei_cl_bus_remove_devices(dev);
+
+	mutex_lock(&dev->device_lock);
+
+	mei_wd_stop(dev);
+
+	dev->dev_state = MEI_DEV_POWER_DOWN;
+	mei_reset(dev);
+	/* move device to disabled state unconditionally */
+	dev->dev_state = MEI_DEV_DISABLED;
+
+	mutex_unlock(&dev->device_lock);
+
+	mei_watchdog_unregister(dev);
+}
+EXPORT_SYMBOL_GPL(mei_stop);
+
+/**
+ * mei_write_is_idle - check if the write queues are idle
+ *
+ * @dev: the device structure
+ *
+ * Return: true of there is no pending write
+ */
+bool mei_write_is_idle(struct mei_device *dev)
+{
+	bool idle = (dev->dev_state == MEI_DEV_ENABLED &&
+		list_empty(&dev->ctrl_wr_list.list) &&
+		list_empty(&dev->write_list.list));
+
+	dev_dbg(dev->dev, "write pg: is idle[%d] state=%s ctrl=%d write=%d\n",
+		idle,
+		mei_dev_state_str(dev->dev_state),
+		list_empty(&dev->ctrl_wr_list.list),
+		list_empty(&dev->write_list.list));
+
+	return idle;
+}
+EXPORT_SYMBOL_GPL(mei_write_is_idle);
+
+/**
+ * mei_device_init  -- initialize mei_device structure
+ *
+ * @dev: the mei device
+ * @device: the device structure
+ * @hw_ops: hw operations
+ */
+void mei_device_init(struct mei_device *dev,
+		     struct device *device,
+		     const struct mei_hw_ops *hw_ops)
+{
+	/* setup our list array */
+	INIT_LIST_HEAD(&dev->file_list);
+	INIT_LIST_HEAD(&dev->device_list);
+	INIT_LIST_HEAD(&dev->me_clients);
+	mutex_init(&dev->device_lock);
+	init_rwsem(&dev->me_clients_rwsem);
+	init_waitqueue_head(&dev->wait_hw_ready);
+	init_waitqueue_head(&dev->wait_pg);
+	init_waitqueue_head(&dev->wait_hbm_start);
+	init_waitqueue_head(&dev->wait_stop_wd);
+	dev->dev_state = MEI_DEV_INITIALIZING;
+	dev->reset_count = 0;
+
+	mei_io_list_init(&dev->write_list);
+	mei_io_list_init(&dev->write_waiting_list);
+	mei_io_list_init(&dev->ctrl_wr_list);
+	mei_io_list_init(&dev->ctrl_rd_list);
+
+	INIT_DELAYED_WORK(&dev->timer_work, mei_timer);
+	INIT_WORK(&dev->init_work, mei_host_client_init);
+	INIT_WORK(&dev->reset_work, mei_reset_work);
+
+	INIT_LIST_HEAD(&dev->wd_cl.link);
+	INIT_LIST_HEAD(&dev->iamthif_cl.link);
+	mei_io_list_init(&dev->amthif_cmd_list);
+	mei_io_list_init(&dev->amthif_rd_complete_list);
+
+	bitmap_zero(dev->host_clients_map, MEI_CLIENTS_MAX);
+	dev->open_handle_count = 0;
+
+	/*
+	 * Reserving the first client ID
+	 * 0: Reserved for MEI Bus Message communications
+	 */
+	bitmap_set(dev->host_clients_map, 0, 1);
+
+	dev->pg_event = MEI_PG_EVENT_IDLE;
+	dev->ops      = hw_ops;
+	dev->dev      = device;
+}
+EXPORT_SYMBOL_GPL(mei_device_init);
+
diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
new file mode 100644
index 000000000..3f84d2edc
--- /dev/null
+++ b/drivers/misc/mei/interrupt.c
@@ -0,0 +1,610 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2003-2012, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+
+
+#include <linux/export.h>
+#include <linux/kthread.h>
+#include <linux/interrupt.h>
+#include <linux/fs.h>
+#include <linux/jiffies.h>
+#include <linux/slab.h>
+
+#include <linux/mei.h>
+
+#include "mei_dev.h"
+#include "hbm.h"
+#include "client.h"
+
+
+/**
+ * mei_irq_compl_handler - dispatch complete handlers
+ *	for the completed callbacks
+ *
+ * @dev: mei device
+ * @compl_list: list of completed cbs
+ */
+void mei_irq_compl_handler(struct mei_device *dev, struct mei_cl_cb *compl_list)
+{
+	struct mei_cl_cb *cb, *next;
+	struct mei_cl *cl;
+
+	list_for_each_entry_safe(cb, next, &compl_list->list, list) {
+		cl = cb->cl;
+		list_del_init(&cb->list);
+
+		dev_dbg(dev->dev, "completing call back.\n");
+		if (cl == &dev->iamthif_cl)
+			mei_amthif_complete(dev, cb);
+		else
+			mei_cl_complete(cl, cb);
+	}
+}
+EXPORT_SYMBOL_GPL(mei_irq_compl_handler);
+
+/**
+ * mei_cl_hbm_equal - check if hbm is addressed to the client
+ *
+ * @cl: host client
+ * @mei_hdr: header of mei client message
+ *
+ * Return: true if matches, false otherwise
+ */
+static inline int mei_cl_hbm_equal(struct mei_cl *cl,
+			struct mei_msg_hdr *mei_hdr)
+{
+	return cl->host_client_id == mei_hdr->host_addr &&
+		cl->me_client_id == mei_hdr->me_addr;
+}
+
+/**
+ * mei_irq_discard_msg  - discard received message
+ *
+ * @dev: mei device
+ * @hdr: message header
+ */
+static inline
+void mei_irq_discard_msg(struct mei_device *dev, struct mei_msg_hdr *hdr)
+{
+	/*
+	 * no need to check for size as it is guarantied
+	 * that length fits into rd_msg_buf
+	 */
+	mei_read_slots(dev, dev->rd_msg_buf, hdr->length);
+	dev_dbg(dev->dev, "discarding message " MEI_HDR_FMT "\n",
+		MEI_HDR_PRM(hdr));
+}
+
+/**
+ * mei_cl_irq_read_msg - process client message
+ *
+ * @cl: reading client
+ * @mei_hdr: header of mei client message
+ * @complete_list: completion list
+ *
+ * Return: always 0
+ */
+int mei_cl_irq_read_msg(struct mei_cl *cl,
+		       struct mei_msg_hdr *mei_hdr,
+		       struct mei_cl_cb *complete_list)
+{
+	struct mei_device *dev = cl->dev;
+	struct mei_cl_cb *cb;
+	unsigned char *buffer = NULL;
+
+	cb = list_first_entry_or_null(&cl->rd_pending, struct mei_cl_cb, list);
+	if (!cb) {
+		cl_err(dev, cl, "pending read cb not found\n");
+		goto out;
+	}
+
+	if (!mei_cl_is_connected(cl)) {
+		cl_dbg(dev, cl, "not connected\n");
+		cb->status = -ENODEV;
+		goto out;
+	}
+
+	if (cb->buf.size == 0 || cb->buf.data == NULL) {
+		cl_err(dev, cl, "response buffer is not allocated.\n");
+		list_move_tail(&cb->list, &complete_list->list);
+		cb->status = -ENOMEM;
+		goto out;
+	}
+
+	if (cb->buf.size < mei_hdr->length + cb->buf_idx) {
+		cl_dbg(dev, cl, "message overflow. size %d len %d idx %ld\n",
+			cb->buf.size, mei_hdr->length, cb->buf_idx);
+		buffer = krealloc(cb->buf.data, mei_hdr->length + cb->buf_idx,
+				  GFP_KERNEL);
+
+		if (!buffer) {
+			cb->status = -ENOMEM;
+			list_move_tail(&cb->list, &complete_list->list);
+			goto out;
+		}
+		cb->buf.data = buffer;
+		cb->buf.size = mei_hdr->length + cb->buf_idx;
+	}
+
+	buffer = cb->buf.data + cb->buf_idx;
+	mei_read_slots(dev, buffer, mei_hdr->length);
+
+	cb->buf_idx += mei_hdr->length;
+
+	if (mei_hdr->msg_complete) {
+		cb->read_time = jiffies;
+		cl_dbg(dev, cl, "completed read length = %lu\n", cb->buf_idx);
+		list_move_tail(&cb->list, &complete_list->list);
+	}
+
+out:
+	if (!buffer)
+		mei_irq_discard_msg(dev, mei_hdr);
+
+	return 0;
+}
+
+/**
+ * mei_cl_irq_disconnect_rsp - send disconnection response message
+ *
+ * @cl: client
+ * @cb: callback block.
+ * @cmpl_list: complete list.
+ *
+ * Return: 0, OK; otherwise, error.
+ */
+static int mei_cl_irq_disconnect_rsp(struct mei_cl *cl, struct mei_cl_cb *cb,
+				     struct mei_cl_cb *cmpl_list)
+{
+	struct mei_device *dev = cl->dev;
+	u32 msg_slots;
+	int slots;
+	int ret;
+
+	slots = mei_hbuf_empty_slots(dev);
+	msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_response));
+
+	if (slots < msg_slots)
+		return -EMSGSIZE;
+
+	ret = mei_hbm_cl_disconnect_rsp(dev, cl);
+
+	cl->state = MEI_FILE_DISCONNECTED;
+	cl->status = 0;
+	mei_io_cb_free(cb);
+
+	return ret;
+}
+
+
+
+/**
+ * mei_cl_irq_disconnect - processes close related operation from
+ *	interrupt thread context - send disconnect request
+ *
+ * @cl: client
+ * @cb: callback block.
+ * @cmpl_list: complete list.
+ *
+ * Return: 0, OK; otherwise, error.
+ */
+static int mei_cl_irq_disconnect(struct mei_cl *cl, struct mei_cl_cb *cb,
+			    struct mei_cl_cb *cmpl_list)
+{
+	struct mei_device *dev = cl->dev;
+	u32 msg_slots;
+	int slots;
+
+	msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request));
+	slots = mei_hbuf_empty_slots(dev);
+
+	if (slots < msg_slots)
+		return -EMSGSIZE;
+
+	if (mei_hbm_cl_disconnect_req(dev, cl)) {
+		cl->status = 0;
+		cb->buf_idx = 0;
+		list_move_tail(&cb->list, &cmpl_list->list);
+		return -EIO;
+	}
+
+	cl->state = MEI_FILE_DISCONNECTING;
+	cl->status = 0;
+	cb->buf_idx = 0;
+	list_move_tail(&cb->list, &dev->ctrl_rd_list.list);
+	cl->timer_count = MEI_CONNECT_TIMEOUT;
+
+	return 0;
+}
+
+
+/**
+ * mei_cl_irq_read - processes client read related operation from the
+ *	interrupt thread context - request for flow control credits
+ *
+ * @cl: client
+ * @cb: callback block.
+ * @cmpl_list: complete list.
+ *
+ * Return: 0, OK; otherwise, error.
+ */
+static int mei_cl_irq_read(struct mei_cl *cl, struct mei_cl_cb *cb,
+			   struct mei_cl_cb *cmpl_list)
+{
+	struct mei_device *dev = cl->dev;
+	u32 msg_slots;
+	int slots;
+	int ret;
+
+	msg_slots = mei_data2slots(sizeof(struct hbm_flow_control));
+	slots = mei_hbuf_empty_slots(dev);
+
+	if (slots < msg_slots)
+		return -EMSGSIZE;
+
+	ret = mei_hbm_cl_flow_control_req(dev, cl);
+	if (ret) {
+		cl->status = ret;
+		cb->buf_idx = 0;
+		list_move_tail(&cb->list, &cmpl_list->list);
+		return ret;
+	}
+
+	list_move_tail(&cb->list, &cl->rd_pending);
+
+	return 0;
+}
+
+
+/**
+ * mei_cl_irq_connect - send connect request in irq_thread context
+ *
+ * @cl: client
+ * @cb: callback block.
+ * @cmpl_list: complete list.
+ *
+ * Return: 0, OK; otherwise, error.
+ */
+static int mei_cl_irq_connect(struct mei_cl *cl, struct mei_cl_cb *cb,
+			      struct mei_cl_cb *cmpl_list)
+{
+	struct mei_device *dev = cl->dev;
+	u32 msg_slots;
+	int slots;
+	int ret;
+
+	msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request));
+	slots = mei_hbuf_empty_slots(dev);
+
+	if (mei_cl_is_other_connecting(cl))
+		return 0;
+
+	if (slots < msg_slots)
+		return -EMSGSIZE;
+
+	cl->state = MEI_FILE_CONNECTING;
+
+	ret = mei_hbm_cl_connect_req(dev, cl);
+	if (ret) {
+		cl->status = ret;
+		cb->buf_idx = 0;
+		list_del_init(&cb->list);
+		return ret;
+	}
+
+	list_move_tail(&cb->list, &dev->ctrl_rd_list.list);
+	cl->timer_count = MEI_CONNECT_TIMEOUT;
+	return 0;
+}
+
+
+/**
+ * mei_irq_read_handler - bottom half read routine after ISR to
+ * handle the read processing.
+ *
+ * @dev: the device structure
+ * @cmpl_list: An instance of our list structure
+ * @slots: slots to read.
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+int mei_irq_read_handler(struct mei_device *dev,
+		struct mei_cl_cb *cmpl_list, s32 *slots)
+{
+	struct mei_msg_hdr *mei_hdr;
+	struct mei_cl *cl;
+	int ret;
+
+	if (!dev->rd_msg_hdr) {
+		dev->rd_msg_hdr = mei_read_hdr(dev);
+		(*slots)--;
+		dev_dbg(dev->dev, "slots =%08x.\n", *slots);
+	}
+	mei_hdr = (struct mei_msg_hdr *) &dev->rd_msg_hdr;
+	dev_dbg(dev->dev, MEI_HDR_FMT, MEI_HDR_PRM(mei_hdr));
+
+	if (mei_hdr->reserved || !dev->rd_msg_hdr) {
+		dev_err(dev->dev, "corrupted message header 0x%08X\n",
+				dev->rd_msg_hdr);
+		ret = -EBADMSG;
+		goto end;
+	}
+
+	if (mei_slots2data(*slots) < mei_hdr->length) {
+		dev_err(dev->dev, "less data available than length=%08x.\n",
+				*slots);
+		/* we can't read the message */
+		ret = -ENODATA;
+		goto end;
+	}
+
+	/*  HBM message */
+	if (mei_hdr->host_addr == 0 && mei_hdr->me_addr == 0) {
+		ret = mei_hbm_dispatch(dev, mei_hdr);
+		if (ret) {
+			dev_dbg(dev->dev, "mei_hbm_dispatch failed ret = %d\n",
+					ret);
+			goto end;
+		}
+		goto reset_slots;
+	}
+
+	/* find recipient cl */
+	list_for_each_entry(cl, &dev->file_list, link) {
+		if (mei_cl_hbm_equal(cl, mei_hdr)) {
+			cl_dbg(dev, cl, "got a message\n");
+			break;
+		}
+	}
+
+	/* if no recipient cl was found we assume corrupted header */
+	if (&cl->link == &dev->file_list) {
+		dev_err(dev->dev, "no destination client found 0x%08X\n",
+				dev->rd_msg_hdr);
+		ret = -EBADMSG;
+		goto end;
+	}
+
+	if (cl == &dev->iamthif_cl) {
+		ret = mei_amthif_irq_read_msg(cl, mei_hdr, cmpl_list);
+	} else {
+		ret = mei_cl_irq_read_msg(cl, mei_hdr, cmpl_list);
+	}
+
+
+reset_slots:
+	/* reset the number of slots and header */
+	*slots = mei_count_full_read_slots(dev);
+	dev->rd_msg_hdr = 0;
+
+	if (*slots == -EOVERFLOW) {
+		/* overflow - reset */
+		dev_err(dev->dev, "resetting due to slots overflow.\n");
+		/* set the event since message has been read */
+		ret = -ERANGE;
+		goto end;
+	}
+end:
+	return ret;
+}
+EXPORT_SYMBOL_GPL(mei_irq_read_handler);
+
+
+/**
+ * mei_irq_write_handler -  dispatch write requests
+ *  after irq received
+ *
+ * @dev: the device structure
+ * @cmpl_list: An instance of our list structure
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list)
+{
+
+	struct mei_cl *cl;
+	struct mei_cl_cb *cb, *next;
+	struct mei_cl_cb *list;
+	s32 slots;
+	int ret;
+
+
+	if (!mei_hbuf_acquire(dev))
+		return 0;
+
+	slots = mei_hbuf_empty_slots(dev);
+	if (slots <= 0)
+		return -EMSGSIZE;
+
+	/* complete all waiting for write CB */
+	dev_dbg(dev->dev, "complete all waiting for write cb.\n");
+
+	list = &dev->write_waiting_list;
+	list_for_each_entry_safe(cb, next, &list->list, list) {
+		cl = cb->cl;
+
+		cl->status = 0;
+		cl_dbg(dev, cl, "MEI WRITE COMPLETE\n");
+		cl->writing_state = MEI_WRITE_COMPLETE;
+		list_move_tail(&cb->list, &cmpl_list->list);
+	}
+
+	if (dev->wd_state == MEI_WD_STOPPING) {
+		dev->wd_state = MEI_WD_IDLE;
+		wake_up(&dev->wait_stop_wd);
+	}
+
+	if (mei_cl_is_connected(&dev->wd_cl)) {
+		if (dev->wd_pending &&
+		    mei_cl_flow_ctrl_creds(&dev->wd_cl) > 0) {
+			ret = mei_wd_send(dev);
+			if (ret)
+				return ret;
+			dev->wd_pending = false;
+		}
+	}
+
+	/* complete control write list CB */
+	dev_dbg(dev->dev, "complete control write list cb.\n");
+	list_for_each_entry_safe(cb, next, &dev->ctrl_wr_list.list, list) {
+		cl = cb->cl;
+		switch (cb->fop_type) {
+		case MEI_FOP_DISCONNECT:
+			/* send disconnect message */
+			ret = mei_cl_irq_disconnect(cl, cb, cmpl_list);
+			if (ret)
+				return ret;
+
+			break;
+		case MEI_FOP_READ:
+			/* send flow control message */
+			ret = mei_cl_irq_read(cl, cb, cmpl_list);
+			if (ret)
+				return ret;
+
+			break;
+		case MEI_FOP_CONNECT:
+			/* connect message */
+			ret = mei_cl_irq_connect(cl, cb, cmpl_list);
+			if (ret)
+				return ret;
+
+			break;
+		case MEI_FOP_DISCONNECT_RSP:
+			/* send disconnect resp */
+			ret = mei_cl_irq_disconnect_rsp(cl, cb, cmpl_list);
+			if (ret)
+				return ret;
+			break;
+		default:
+			BUG();
+		}
+
+	}
+	/* complete  write list CB */
+	dev_dbg(dev->dev, "complete write list cb.\n");
+	list_for_each_entry_safe(cb, next, &dev->write_list.list, list) {
+		cl = cb->cl;
+		if (cl == &dev->iamthif_cl)
+			ret = mei_amthif_irq_write(cl, cb, cmpl_list);
+		else
+			ret = mei_cl_irq_write(cl, cb, cmpl_list);
+		if (ret)
+			return ret;
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mei_irq_write_handler);
+
+
+
+/**
+ * mei_timer - timer function.
+ *
+ * @work: pointer to the work_struct structure
+ *
+ */
+void mei_timer(struct work_struct *work)
+{
+	unsigned long timeout;
+	struct mei_cl *cl;
+
+	struct mei_device *dev = container_of(work,
+					struct mei_device, timer_work.work);
+
+
+	mutex_lock(&dev->device_lock);
+
+	/* Catch interrupt stalls during HBM init handshake */
+	if (dev->dev_state == MEI_DEV_INIT_CLIENTS &&
+	    dev->hbm_state != MEI_HBM_IDLE) {
+
+		if (dev->init_clients_timer) {
+			if (--dev->init_clients_timer == 0) {
+				dev_err(dev->dev, "timer: init clients timeout hbm_state = %d.\n",
+					dev->hbm_state);
+				mei_reset(dev);
+				goto out;
+			}
+		}
+	}
+
+	if (dev->dev_state != MEI_DEV_ENABLED)
+		goto out;
+
+	/*** connect/disconnect timeouts ***/
+	list_for_each_entry(cl, &dev->file_list, link) {
+		if (cl->timer_count) {
+			if (--cl->timer_count == 0) {
+				dev_err(dev->dev, "timer: connect/disconnect timeout.\n");
+				mei_reset(dev);
+				goto out;
+			}
+		}
+	}
+
+	if (!mei_cl_is_connected(&dev->iamthif_cl))
+		goto out;
+
+	if (dev->iamthif_stall_timer) {
+		if (--dev->iamthif_stall_timer == 0) {
+			dev_err(dev->dev, "timer: amthif  hanged.\n");
+			mei_reset(dev);
+			dev->iamthif_canceled = false;
+			dev->iamthif_state = MEI_IAMTHIF_IDLE;
+			dev->iamthif_timer = 0;
+
+			mei_io_cb_free(dev->iamthif_current_cb);
+			dev->iamthif_current_cb = NULL;
+
+			dev->iamthif_file_object = NULL;
+			mei_amthif_run_next_cmd(dev);
+		}
+	}
+
+	if (dev->iamthif_timer) {
+
+		timeout = dev->iamthif_timer +
+			mei_secs_to_jiffies(MEI_IAMTHIF_READ_TIMER);
+
+		dev_dbg(dev->dev, "dev->iamthif_timer = %ld\n",
+				dev->iamthif_timer);
+		dev_dbg(dev->dev, "timeout = %ld\n", timeout);
+		dev_dbg(dev->dev, "jiffies = %ld\n", jiffies);
+		if (time_after(jiffies, timeout)) {
+			/*
+			 * User didn't read the AMTHI data on time (15sec)
+			 * freeing AMTHI for other requests
+			 */
+
+			dev_dbg(dev->dev, "freeing AMTHI for other requests\n");
+
+			mei_io_list_flush(&dev->amthif_rd_complete_list,
+				&dev->iamthif_cl);
+			mei_io_cb_free(dev->iamthif_current_cb);
+			dev->iamthif_current_cb = NULL;
+
+			dev->iamthif_file_object->private_data = NULL;
+			dev->iamthif_file_object = NULL;
+			dev->iamthif_timer = 0;
+			mei_amthif_run_next_cmd(dev);
+
+		}
+	}
+out:
+	if (dev->dev_state != MEI_DEV_DISABLED)
+		schedule_delayed_work(&dev->timer_work, 2 * HZ);
+	mutex_unlock(&dev->device_lock);
+}
diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c
new file mode 100644
index 000000000..3e2968159
--- /dev/null
+++ b/drivers/misc/mei/main.c
@@ -0,0 +1,788 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2003-2012, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/poll.h>
+#include <linux/init.h>
+#include <linux/ioctl.h>
+#include <linux/cdev.h>
+#include <linux/sched.h>
+#include <linux/uuid.h>
+#include <linux/compat.h>
+#include <linux/jiffies.h>
+#include <linux/interrupt.h>
+
+#include <linux/mei.h>
+
+#include "mei_dev.h"
+#include "client.h"
+
+/**
+ * mei_open - the open function
+ *
+ * @inode: pointer to inode structure
+ * @file: pointer to file structure
+ *
+ * Return: 0 on success, <0 on error
+ */
+static int mei_open(struct inode *inode, struct file *file)
+{
+	struct mei_device *dev;
+	struct mei_cl *cl;
+
+	int err;
+
+	dev = container_of(inode->i_cdev, struct mei_device, cdev);
+	if (!dev)
+		return -ENODEV;
+
+	mutex_lock(&dev->device_lock);
+
+	if (dev->dev_state != MEI_DEV_ENABLED) {
+		dev_dbg(dev->dev, "dev_state != MEI_ENABLED  dev_state = %s\n",
+		    mei_dev_state_str(dev->dev_state));
+		err = -ENODEV;
+		goto err_unlock;
+	}
+
+	cl = mei_cl_alloc_linked(dev, MEI_HOST_CLIENT_ID_ANY);
+	if (IS_ERR(cl)) {
+		err = PTR_ERR(cl);
+		goto err_unlock;
+	}
+
+	file->private_data = cl;
+
+	mutex_unlock(&dev->device_lock);
+
+	return nonseekable_open(inode, file);
+
+err_unlock:
+	mutex_unlock(&dev->device_lock);
+	return err;
+}
+
+/**
+ * mei_release - the release function
+ *
+ * @inode: pointer to inode structure
+ * @file: pointer to file structure
+ *
+ * Return: 0 on success, <0 on error
+ */
+static int mei_release(struct inode *inode, struct file *file)
+{
+	struct mei_cl *cl = file->private_data;
+	struct mei_device *dev;
+	int rets = 0;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	mutex_lock(&dev->device_lock);
+	if (cl == &dev->iamthif_cl) {
+		rets = mei_amthif_release(dev, file);
+		goto out;
+	}
+	if (mei_cl_is_connected(cl)) {
+		cl->state = MEI_FILE_DISCONNECTING;
+		cl_dbg(dev, cl, "disconnecting\n");
+		rets = mei_cl_disconnect(cl);
+	}
+	mei_cl_flush_queues(cl, file);
+	cl_dbg(dev, cl, "removing\n");
+
+	mei_cl_unlink(cl);
+
+	file->private_data = NULL;
+
+	kfree(cl);
+out:
+	mutex_unlock(&dev->device_lock);
+	return rets;
+}
+
+
+/**
+ * mei_read - the read function.
+ *
+ * @file: pointer to file structure
+ * @ubuf: pointer to user buffer
+ * @length: buffer length
+ * @offset: data offset in buffer
+ *
+ * Return: >=0 data length on success , <0 on error
+ */
+static ssize_t mei_read(struct file *file, char __user *ubuf,
+			size_t length, loff_t *offset)
+{
+	struct mei_cl *cl = file->private_data;
+	struct mei_device *dev;
+	struct mei_cl_cb *cb = NULL;
+	int rets;
+	int err;
+
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	dev = cl->dev;
+
+
+	mutex_lock(&dev->device_lock);
+	if (dev->dev_state != MEI_DEV_ENABLED) {
+		rets = -ENODEV;
+		goto out;
+	}
+
+	if (length == 0) {
+		rets = 0;
+		goto out;
+	}
+
+	if (cl == &dev->iamthif_cl) {
+		rets = mei_amthif_read(dev, file, ubuf, length, offset);
+		goto out;
+	}
+
+	cb = mei_cl_read_cb(cl, file);
+	if (cb) {
+		/* read what left */
+		if (cb->buf_idx > *offset)
+			goto copy_buffer;
+		/* offset is beyond buf_idx we have no more data return 0 */
+		if (cb->buf_idx > 0 && cb->buf_idx <= *offset) {
+			rets = 0;
+			goto free;
+		}
+		/* Offset needs to be cleaned for contiguous reads*/
+		if (cb->buf_idx == 0 && *offset > 0)
+			*offset = 0;
+	} else if (*offset > 0) {
+		*offset = 0;
+	}
+
+	err = mei_cl_read_start(cl, length, file);
+	if (err && err != -EBUSY) {
+		dev_dbg(dev->dev,
+			"mei start read failure with status = %d\n", err);
+		rets = err;
+		goto out;
+	}
+
+	if (list_empty(&cl->rd_completed) && !waitqueue_active(&cl->rx_wait)) {
+		if (file->f_flags & O_NONBLOCK) {
+			rets = -EAGAIN;
+			goto out;
+		}
+
+		mutex_unlock(&dev->device_lock);
+
+		if (wait_event_interruptible(cl->rx_wait,
+				(!list_empty(&cl->rd_completed)) ||
+				(!mei_cl_is_connected(cl)))) {
+
+			if (signal_pending(current))
+				return -EINTR;
+			return -ERESTARTSYS;
+		}
+
+		mutex_lock(&dev->device_lock);
+		if (!mei_cl_is_connected(cl)) {
+			rets = -EBUSY;
+			goto out;
+		}
+	}
+
+	cb = mei_cl_read_cb(cl, file);
+	if (!cb) {
+		rets = 0;
+		goto out;
+	}
+
+copy_buffer:
+	/* now copy the data to user space */
+	if (cb->status) {
+		rets = cb->status;
+		dev_dbg(dev->dev, "read operation failed %d\n", rets);
+		goto free;
+	}
+
+	dev_dbg(dev->dev, "buf.size = %d buf.idx= %ld\n",
+	    cb->buf.size, cb->buf_idx);
+	if (length == 0 || ubuf == NULL || *offset > cb->buf_idx) {
+		rets = -EMSGSIZE;
+		goto free;
+	}
+
+	/* length is being truncated to PAGE_SIZE,
+	 * however buf_idx may point beyond that */
+	length = min_t(size_t, length, cb->buf_idx - *offset);
+
+	if (copy_to_user(ubuf, cb->buf.data + *offset, length)) {
+		dev_dbg(dev->dev, "failed to copy data to userland\n");
+		rets = -EFAULT;
+		goto free;
+	}
+
+	rets = length;
+	*offset += length;
+	if ((unsigned long)*offset < cb->buf_idx)
+		goto out;
+
+free:
+	mei_io_cb_free(cb);
+
+out:
+	dev_dbg(dev->dev, "end mei read rets= %d\n", rets);
+	mutex_unlock(&dev->device_lock);
+	return rets;
+}
+/**
+ * mei_write - the write function.
+ *
+ * @file: pointer to file structure
+ * @ubuf: pointer to user buffer
+ * @length: buffer length
+ * @offset: data offset in buffer
+ *
+ * Return: >=0 data length on success , <0 on error
+ */
+static ssize_t mei_write(struct file *file, const char __user *ubuf,
+			 size_t length, loff_t *offset)
+{
+	struct mei_cl *cl = file->private_data;
+	struct mei_me_client *me_cl = NULL;
+	struct mei_cl_cb *write_cb = NULL;
+	struct mei_device *dev;
+	unsigned long timeout = 0;
+	int rets;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	mutex_lock(&dev->device_lock);
+
+	if (dev->dev_state != MEI_DEV_ENABLED) {
+		rets = -ENODEV;
+		goto out;
+	}
+
+	me_cl = mei_me_cl_by_uuid_id(dev, &cl->cl_uuid, cl->me_client_id);
+	if (!me_cl) {
+		rets = -ENOTTY;
+		goto out;
+	}
+
+	if (length == 0) {
+		rets = 0;
+		goto out;
+	}
+
+	if (length > me_cl->props.max_msg_length) {
+		rets = -EFBIG;
+		goto out;
+	}
+
+	if (!mei_cl_is_connected(cl)) {
+		cl_err(dev, cl, "is not connected");
+		rets = -ENODEV;
+		goto out;
+	}
+	if (cl == &dev->iamthif_cl) {
+		write_cb = mei_amthif_find_read_list_entry(dev, file);
+
+		if (write_cb) {
+			timeout = write_cb->read_time +
+				mei_secs_to_jiffies(MEI_IAMTHIF_READ_TIMER);
+
+			if (time_after(jiffies, timeout)) {
+				*offset = 0;
+				mei_io_cb_free(write_cb);
+				write_cb = NULL;
+			}
+		}
+	}
+
+	*offset = 0;
+	write_cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, file);
+	if (!write_cb) {
+		rets = -ENOMEM;
+		goto out;
+	}
+
+	rets = copy_from_user(write_cb->buf.data, ubuf, length);
+	if (rets) {
+		dev_dbg(dev->dev, "failed to copy data from userland\n");
+		rets = -EFAULT;
+		goto out;
+	}
+
+	if (cl == &dev->iamthif_cl) {
+		rets = mei_amthif_write(cl, write_cb);
+
+		if (rets) {
+			dev_err(dev->dev,
+				"amthif write failed with status = %d\n", rets);
+			goto out;
+		}
+		mei_me_cl_put(me_cl);
+		mutex_unlock(&dev->device_lock);
+		return length;
+	}
+
+	rets = mei_cl_write(cl, write_cb, false);
+out:
+	mei_me_cl_put(me_cl);
+	mutex_unlock(&dev->device_lock);
+	if (rets < 0)
+		mei_io_cb_free(write_cb);
+	return rets;
+}
+
+/**
+ * mei_ioctl_connect_client - the connect to fw client IOCTL function
+ *
+ * @file: private data of the file object
+ * @data: IOCTL connect data, input and output parameters
+ *
+ * Locking: called under "dev->device_lock" lock
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+static int mei_ioctl_connect_client(struct file *file,
+			struct mei_connect_client_data *data)
+{
+	struct mei_device *dev;
+	struct mei_client *client;
+	struct mei_me_client *me_cl;
+	struct mei_cl *cl;
+	int rets;
+
+	cl = file->private_data;
+	dev = cl->dev;
+
+	if (dev->dev_state != MEI_DEV_ENABLED)
+		return -ENODEV;
+
+	if (cl->state != MEI_FILE_INITIALIZING &&
+	    cl->state != MEI_FILE_DISCONNECTED)
+		return  -EBUSY;
+
+	/* find ME client we're trying to connect to */
+	me_cl = mei_me_cl_by_uuid(dev, &data->in_client_uuid);
+	if (!me_cl || me_cl->props.fixed_address) {
+		dev_dbg(dev->dev, "Cannot connect to FW Client UUID = %pUl\n",
+				&data->in_client_uuid);
+		return  -ENOTTY;
+	}
+
+	cl->me_client_id = me_cl->client_id;
+	cl->cl_uuid = me_cl->props.protocol_name;
+
+	dev_dbg(dev->dev, "Connect to FW Client ID = %d\n",
+			cl->me_client_id);
+	dev_dbg(dev->dev, "FW Client - Protocol Version = %d\n",
+			me_cl->props.protocol_version);
+	dev_dbg(dev->dev, "FW Client - Max Msg Len = %d\n",
+			me_cl->props.max_msg_length);
+
+	/* if we're connecting to amthif client then we will use the
+	 * existing connection
+	 */
+	if (uuid_le_cmp(data->in_client_uuid, mei_amthif_guid) == 0) {
+		dev_dbg(dev->dev, "FW Client is amthi\n");
+		if (!mei_cl_is_connected(&dev->iamthif_cl)) {
+			rets = -ENODEV;
+			goto end;
+		}
+		mei_cl_unlink(cl);
+
+		kfree(cl);
+		cl = NULL;
+		dev->iamthif_open_count++;
+		file->private_data = &dev->iamthif_cl;
+
+		client = &data->out_client_properties;
+		client->max_msg_length = me_cl->props.max_msg_length;
+		client->protocol_version = me_cl->props.protocol_version;
+		rets = dev->iamthif_cl.status;
+
+		goto end;
+	}
+
+	/* prepare the output buffer */
+	client = &data->out_client_properties;
+	client->max_msg_length = me_cl->props.max_msg_length;
+	client->protocol_version = me_cl->props.protocol_version;
+	dev_dbg(dev->dev, "Can connect?\n");
+
+	rets = mei_cl_connect(cl, file);
+
+end:
+	mei_me_cl_put(me_cl);
+	return rets;
+}
+
+/**
+ * mei_ioctl - the IOCTL function
+ *
+ * @file: pointer to file structure
+ * @cmd: ioctl command
+ * @data: pointer to mei message structure
+ *
+ * Return: 0 on success , <0 on error
+ */
+static long mei_ioctl(struct file *file, unsigned int cmd, unsigned long data)
+{
+	struct mei_device *dev;
+	struct mei_cl *cl = file->private_data;
+	struct mei_connect_client_data connect_data;
+	int rets;
+
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	dev_dbg(dev->dev, "IOCTL cmd = 0x%x", cmd);
+
+	mutex_lock(&dev->device_lock);
+	if (dev->dev_state != MEI_DEV_ENABLED) {
+		rets = -ENODEV;
+		goto out;
+	}
+
+	switch (cmd) {
+	case IOCTL_MEI_CONNECT_CLIENT:
+		dev_dbg(dev->dev, ": IOCTL_MEI_CONNECT_CLIENT.\n");
+		if (copy_from_user(&connect_data, (char __user *)data,
+				sizeof(struct mei_connect_client_data))) {
+			dev_dbg(dev->dev, "failed to copy data from userland\n");
+			rets = -EFAULT;
+			goto out;
+		}
+
+		rets = mei_ioctl_connect_client(file, &connect_data);
+		if (rets)
+			goto out;
+
+		/* if all is ok, copying the data back to user. */
+		if (copy_to_user((char __user *)data, &connect_data,
+				sizeof(struct mei_connect_client_data))) {
+			dev_dbg(dev->dev, "failed to copy data to userland\n");
+			rets = -EFAULT;
+			goto out;
+		}
+
+		break;
+
+	default:
+		dev_err(dev->dev, ": unsupported ioctl %d.\n", cmd);
+		rets = -ENOIOCTLCMD;
+	}
+
+out:
+	mutex_unlock(&dev->device_lock);
+	return rets;
+}
+
+/**
+ * mei_compat_ioctl - the compat IOCTL function
+ *
+ * @file: pointer to file structure
+ * @cmd: ioctl command
+ * @data: pointer to mei message structure
+ *
+ * Return: 0 on success , <0 on error
+ */
+#ifdef CONFIG_COMPAT
+static long mei_compat_ioctl(struct file *file,
+			unsigned int cmd, unsigned long data)
+{
+	return mei_ioctl(file, cmd, (unsigned long)compat_ptr(data));
+}
+#endif
+
+
+/**
+ * mei_poll - the poll function
+ *
+ * @file: pointer to file structure
+ * @wait: pointer to poll_table structure
+ *
+ * Return: poll mask
+ */
+static unsigned int mei_poll(struct file *file, poll_table *wait)
+{
+	unsigned long req_events = poll_requested_events(wait);
+	struct mei_cl *cl = file->private_data;
+	struct mei_device *dev;
+	unsigned int mask = 0;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return POLLERR;
+
+	dev = cl->dev;
+
+	mutex_lock(&dev->device_lock);
+
+
+	if (dev->dev_state != MEI_DEV_ENABLED ||
+	    !mei_cl_is_connected(cl)) {
+		mask = POLLERR;
+		goto out;
+	}
+
+	if (cl == &dev->iamthif_cl) {
+		mask = mei_amthif_poll(dev, file, wait);
+		goto out;
+	}
+
+	if (req_events & (POLLIN | POLLRDNORM)) {
+		poll_wait(file, &cl->rx_wait, wait);
+
+		if (!list_empty(&cl->rd_completed))
+			mask |= POLLIN | POLLRDNORM;
+		else
+			mei_cl_read_start(cl, 0, file);
+	}
+
+out:
+	mutex_unlock(&dev->device_lock);
+	return mask;
+}
+
+/**
+ * fw_status_show - mei device attribute show method
+ *
+ * @device: device pointer
+ * @attr: attribute pointer
+ * @buf:  char out buffer
+ *
+ * Return: number of the bytes printed into buf or error
+ */
+static ssize_t fw_status_show(struct device *device,
+		struct device_attribute *attr, char *buf)
+{
+	struct mei_device *dev = dev_get_drvdata(device);
+	struct mei_fw_status fw_status;
+	int err, i;
+	ssize_t cnt = 0;
+
+	mutex_lock(&dev->device_lock);
+	err = mei_fw_status(dev, &fw_status);
+	mutex_unlock(&dev->device_lock);
+	if (err) {
+		dev_err(device, "read fw_status error = %d\n", err);
+		return err;
+	}
+
+	for (i = 0; i < fw_status.count; i++)
+		cnt += scnprintf(buf + cnt, PAGE_SIZE - cnt, "%08X\n",
+				fw_status.status[i]);
+	return cnt;
+}
+static DEVICE_ATTR_RO(fw_status);
+
+static struct attribute *mei_attrs[] = {
+	&dev_attr_fw_status.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(mei);
+
+/*
+ * file operations structure will be used for mei char device.
+ */
+static const struct file_operations mei_fops = {
+	.owner = THIS_MODULE,
+	.read = mei_read,
+	.unlocked_ioctl = mei_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl = mei_compat_ioctl,
+#endif
+	.open = mei_open,
+	.release = mei_release,
+	.write = mei_write,
+	.poll = mei_poll,
+	.llseek = no_llseek
+};
+
+static struct class *mei_class;
+static dev_t mei_devt;
+#define MEI_MAX_DEVS  MINORMASK
+static DEFINE_MUTEX(mei_minor_lock);
+static DEFINE_IDR(mei_idr);
+
+/**
+ * mei_minor_get - obtain next free device minor number
+ *
+ * @dev:  device pointer
+ *
+ * Return: allocated minor, or -ENOSPC if no free minor left
+ */
+static int mei_minor_get(struct mei_device *dev)
+{
+	int ret;
+
+	mutex_lock(&mei_minor_lock);
+	ret = idr_alloc(&mei_idr, dev, 0, MEI_MAX_DEVS, GFP_KERNEL);
+	if (ret >= 0)
+		dev->minor = ret;
+	else if (ret == -ENOSPC)
+		dev_err(dev->dev, "too many mei devices\n");
+
+	mutex_unlock(&mei_minor_lock);
+	return ret;
+}
+
+/**
+ * mei_minor_free - mark device minor number as free
+ *
+ * @dev:  device pointer
+ */
+static void mei_minor_free(struct mei_device *dev)
+{
+	mutex_lock(&mei_minor_lock);
+	idr_remove(&mei_idr, dev->minor);
+	mutex_unlock(&mei_minor_lock);
+}
+
+int mei_register(struct mei_device *dev, struct device *parent)
+{
+	struct device *clsdev; /* class device */
+	int ret, devno;
+
+	ret = mei_minor_get(dev);
+	if (ret < 0)
+		return ret;
+
+	/* Fill in the data structures */
+	devno = MKDEV(MAJOR(mei_devt), dev->minor);
+	cdev_init(&dev->cdev, &mei_fops);
+	dev->cdev.owner = mei_fops.owner;
+
+	/* Add the device */
+	ret = cdev_add(&dev->cdev, devno, 1);
+	if (ret) {
+		dev_err(parent, "unable to add device %d:%d\n",
+			MAJOR(mei_devt), dev->minor);
+		goto err_dev_add;
+	}
+
+	clsdev = device_create_with_groups(mei_class, parent, devno,
+					   dev, mei_groups,
+					   "mei%d", dev->minor);
+
+	if (IS_ERR(clsdev)) {
+		dev_err(parent, "unable to create device %d:%d\n",
+			MAJOR(mei_devt), dev->minor);
+		ret = PTR_ERR(clsdev);
+		goto err_dev_create;
+	}
+
+	ret = mei_dbgfs_register(dev, dev_name(clsdev));
+	if (ret) {
+		dev_err(clsdev, "cannot register debugfs ret = %d\n", ret);
+		goto err_dev_dbgfs;
+	}
+
+	return 0;
+
+err_dev_dbgfs:
+	device_destroy(mei_class, devno);
+err_dev_create:
+	cdev_del(&dev->cdev);
+err_dev_add:
+	mei_minor_free(dev);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(mei_register);
+
+void mei_deregister(struct mei_device *dev)
+{
+	int devno;
+
+	devno = dev->cdev.dev;
+	cdev_del(&dev->cdev);
+
+	mei_dbgfs_deregister(dev);
+
+	device_destroy(mei_class, devno);
+
+	mei_minor_free(dev);
+}
+EXPORT_SYMBOL_GPL(mei_deregister);
+
+static int __init mei_init(void)
+{
+	int ret;
+
+	mei_class = class_create(THIS_MODULE, "mei");
+	if (IS_ERR(mei_class)) {
+		pr_err("couldn't create class\n");
+		ret = PTR_ERR(mei_class);
+		goto err;
+	}
+
+	ret = alloc_chrdev_region(&mei_devt, 0, MEI_MAX_DEVS, "mei");
+	if (ret < 0) {
+		pr_err("unable to allocate char dev region\n");
+		goto err_class;
+	}
+
+	ret = mei_cl_bus_init();
+	if (ret < 0) {
+		pr_err("unable to initialize bus\n");
+		goto err_chrdev;
+	}
+
+	return 0;
+
+err_chrdev:
+	unregister_chrdev_region(mei_devt, MEI_MAX_DEVS);
+err_class:
+	class_destroy(mei_class);
+err:
+	return ret;
+}
+
+static void __exit mei_exit(void)
+{
+	unregister_chrdev_region(mei_devt, MEI_MAX_DEVS);
+	class_destroy(mei_class);
+	mei_cl_bus_exit();
+}
+
+module_init(mei_init);
+module_exit(mei_exit);
+
+MODULE_AUTHOR("Intel Corporation");
+MODULE_DESCRIPTION("Intel(R) Management Engine Interface");
+MODULE_LICENSE("GPL v2");
+
diff --git a/drivers/misc/mei/mei-trace.c b/drivers/misc/mei/mei-trace.c
new file mode 100644
index 000000000..388efb519
--- /dev/null
+++ b/drivers/misc/mei/mei-trace.c
@@ -0,0 +1,25 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2015, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+#include <linux/module.h>
+
+/* sparse doesn't like tracepoint macros */
+#ifndef __CHECKER__
+#define CREATE_TRACE_POINTS
+#include "mei-trace.h"
+
+EXPORT_TRACEPOINT_SYMBOL(mei_reg_read);
+EXPORT_TRACEPOINT_SYMBOL(mei_reg_write);
+#endif /* __CHECKER__ */
diff --git a/drivers/misc/mei/mei-trace.h b/drivers/misc/mei/mei-trace.h
new file mode 100644
index 000000000..47e1bc655
--- /dev/null
+++ b/drivers/misc/mei/mei-trace.h
@@ -0,0 +1,74 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2015, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#if !defined(_MEI_TRACE_H_) || defined(TRACE_HEADER_MULTI_READ)
+#define _MEI_TRACE_H_
+
+#include <linux/stringify.h>
+#include <linux/types.h>
+#include <linux/tracepoint.h>
+
+#include <linux/device.h>
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM mei
+
+TRACE_EVENT(mei_reg_read,
+	TP_PROTO(const struct device *dev, const char *reg, u32 offs, u32 val),
+	TP_ARGS(dev, reg, offs, val),
+	TP_STRUCT__entry(
+		__string(dev, dev_name(dev))
+		__field(const char *, reg)
+		__field(u32, offs)
+		__field(u32, val)
+	),
+	TP_fast_assign(
+		__assign_str(dev, dev_name(dev))
+		__entry->reg  = reg;
+		__entry->offs = offs;
+		__entry->val = val;
+	),
+	TP_printk("[%s] read %s:[%#x] = %#x",
+		  __get_str(dev), __entry->reg, __entry->offs, __entry->val)
+);
+
+TRACE_EVENT(mei_reg_write,
+	TP_PROTO(const struct device *dev, const char *reg, u32 offs, u32 val),
+	TP_ARGS(dev, reg, offs, val),
+	TP_STRUCT__entry(
+		__string(dev, dev_name(dev))
+		__field(const char *, reg)
+		__field(u32, offs)
+		__field(u32, val)
+	),
+	TP_fast_assign(
+		__assign_str(dev, dev_name(dev))
+		__entry->reg = reg;
+		__entry->offs = offs;
+		__entry->val = val;
+	),
+	TP_printk("[%s] write %s[%#x] = %#x)",
+		  __get_str(dev), __entry->reg,  __entry->offs, __entry->val)
+);
+
+#endif /* _MEI_TRACE_H_ */
+
+/* This part must be outside protection */
+#undef TRACE_INCLUDE_PATH
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_PATH .
+#define TRACE_INCLUDE_FILE mei-trace
+#include <trace/define_trace.h>
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
new file mode 100644
index 000000000..f84c39ee2
--- /dev/null
+++ b/drivers/misc/mei/mei_dev.h
@@ -0,0 +1,865 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2003-2012, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#ifndef _MEI_DEV_H_
+#define _MEI_DEV_H_
+
+#include <linux/types.h>
+#include <linux/watchdog.h>
+#include <linux/poll.h>
+#include <linux/mei.h>
+#include <linux/mei_cl_bus.h>
+
+#include "hw.h"
+#include "hbm.h"
+
+/*
+ * watch dog definition
+ */
+#define MEI_WD_HDR_SIZE       4
+#define MEI_WD_STOP_MSG_SIZE  MEI_WD_HDR_SIZE
+#define MEI_WD_START_MSG_SIZE (MEI_WD_HDR_SIZE + 16)
+
+#define MEI_WD_DEFAULT_TIMEOUT   120  /* seconds */
+#define MEI_WD_MIN_TIMEOUT       120  /* seconds */
+#define MEI_WD_MAX_TIMEOUT     65535  /* seconds */
+
+#define MEI_WD_STOP_TIMEOUT      10 /* msecs */
+
+#define MEI_WD_STATE_INDEPENDENCE_MSG_SENT       (1 << 0)
+
+#define MEI_RD_MSG_BUF_SIZE           (128 * sizeof(u32))
+
+
+/*
+ * AMTHI Client UUID
+ */
+extern const uuid_le mei_amthif_guid;
+
+/*
+ * Watchdog Client UUID
+ */
+extern const uuid_le mei_wd_guid;
+
+/*
+ * Number of Maximum MEI Clients
+ */
+#define MEI_CLIENTS_MAX 256
+
+/*
+ * maximum number of consecutive resets
+ */
+#define MEI_MAX_CONSEC_RESET  3
+
+/*
+ * Number of File descriptors/handles
+ * that can be opened to the driver.
+ *
+ * Limit to 255: 256 Total Clients
+ * minus internal client for MEI Bus Messages
+ */
+#define  MEI_MAX_OPEN_HANDLE_COUNT (MEI_CLIENTS_MAX - 1)
+
+/*
+ * Internal Clients Number
+ */
+#define MEI_HOST_CLIENT_ID_ANY        (-1)
+#define MEI_HBM_HOST_CLIENT_ID         0 /* not used, just for documentation */
+#define MEI_WD_HOST_CLIENT_ID          1
+#define MEI_IAMTHIF_HOST_CLIENT_ID     2
+
+
+/* File state */
+enum file_state {
+	MEI_FILE_INITIALIZING = 0,
+	MEI_FILE_CONNECTING,
+	MEI_FILE_CONNECTED,
+	MEI_FILE_DISCONNECTING,
+	MEI_FILE_DISCONNECTED
+};
+
+/* MEI device states */
+enum mei_dev_state {
+	MEI_DEV_INITIALIZING = 0,
+	MEI_DEV_INIT_CLIENTS,
+	MEI_DEV_ENABLED,
+	MEI_DEV_RESETTING,
+	MEI_DEV_DISABLED,
+	MEI_DEV_POWER_DOWN,
+	MEI_DEV_POWER_UP
+};
+
+const char *mei_dev_state_str(int state);
+
+enum iamthif_states {
+	MEI_IAMTHIF_IDLE,
+	MEI_IAMTHIF_WRITING,
+	MEI_IAMTHIF_FLOW_CONTROL,
+	MEI_IAMTHIF_READING,
+	MEI_IAMTHIF_READ_COMPLETE
+};
+
+enum mei_file_transaction_states {
+	MEI_IDLE,
+	MEI_WRITING,
+	MEI_WRITE_COMPLETE,
+	MEI_FLOW_CONTROL,
+	MEI_READING,
+	MEI_READ_COMPLETE
+};
+
+enum mei_wd_states {
+	MEI_WD_IDLE,
+	MEI_WD_RUNNING,
+	MEI_WD_STOPPING,
+};
+
+/**
+ * enum mei_cb_file_ops  - file operation associated with the callback
+ * @MEI_FOP_READ:       read
+ * @MEI_FOP_WRITE:      write
+ * @MEI_FOP_CONNECT:    connect
+ * @MEI_FOP_DISCONNECT: disconnect
+ * @MEI_FOP_DISCONNECT_RSP: disconnect response
+ */
+enum mei_cb_file_ops {
+	MEI_FOP_READ = 0,
+	MEI_FOP_WRITE,
+	MEI_FOP_CONNECT,
+	MEI_FOP_DISCONNECT,
+	MEI_FOP_DISCONNECT_RSP,
+};
+
+/*
+ * Intel MEI message data struct
+ */
+struct mei_msg_data {
+	u32 size;
+	unsigned char *data;
+};
+
+/* Maximum number of processed FW status registers */
+#define MEI_FW_STATUS_MAX 6
+/* Minimal  buffer for FW status string (8 bytes in dw + space or '\0') */
+#define MEI_FW_STATUS_STR_SZ (MEI_FW_STATUS_MAX * (8 + 1))
+
+
+/*
+ * struct mei_fw_status - storage of FW status data
+ *
+ * @count: number of actually available elements in array
+ * @status: FW status registers
+ */
+struct mei_fw_status {
+	int count;
+	u32 status[MEI_FW_STATUS_MAX];
+};
+
+/**
+ * struct mei_me_client - representation of me (fw) client
+ *
+ * @list: link in me client list
+ * @refcnt: struct reference count
+ * @props: client properties
+ * @client_id: me client id
+ * @mei_flow_ctrl_creds: flow control credits
+ */
+struct mei_me_client {
+	struct list_head list;
+	struct kref refcnt;
+	struct mei_client_properties props;
+	u8 client_id;
+	u8 mei_flow_ctrl_creds;
+};
+
+
+struct mei_cl;
+
+/**
+ * struct mei_cl_cb - file operation callback structure
+ *
+ * @list: link in callback queue
+ * @cl: file client who is running this operation
+ * @fop_type: file operation type
+ * @buf: buffer for data associated with the callback
+ * @buf_idx: last read index
+ * @read_time: last read operation time stamp (iamthif)
+ * @file_object: pointer to file structure
+ * @status: io status of the cb
+ * @internal: communication between driver and FW flag
+ * @completed: the transfer or reception has completed
+ */
+struct mei_cl_cb {
+	struct list_head list;
+	struct mei_cl *cl;
+	enum mei_cb_file_ops fop_type;
+	struct mei_msg_data buf;
+	unsigned long buf_idx;
+	unsigned long read_time;
+	struct file *file_object;
+	int status;
+	u32 internal:1;
+	u32 completed:1;
+};
+
+/**
+ * struct mei_cl - me client host representation
+ *    carried in file->private_data
+ *
+ * @link: link in the clients list
+ * @dev: mei parent device
+ * @state: file operation state
+ * @tx_wait: wait queue for tx completion
+ * @rx_wait: wait queue for rx completion
+ * @wait:  wait queue for management operation
+ * @status: connection status
+ * @cl_uuid: client uuid name
+ * @host_client_id: host id
+ * @me_client_id: me/fw id
+ * @mei_flow_ctrl_creds: transmit flow credentials
+ * @timer_count:  watchdog timer for operation completion
+ * @writing_state: state of the tx
+ * @rd_pending: pending read credits
+ * @rd_completed: completed read
+ *
+ * @device: device on the mei client bus
+ * @device_link:  link to bus clients
+ */
+struct mei_cl {
+	struct list_head link;
+	struct mei_device *dev;
+	enum file_state state;
+	wait_queue_head_t tx_wait;
+	wait_queue_head_t rx_wait;
+	wait_queue_head_t wait;
+	int status;
+	uuid_le cl_uuid;
+	u8 host_client_id;
+	u8 me_client_id;
+	u8 mei_flow_ctrl_creds;
+	u8 timer_count;
+	enum mei_file_transaction_states writing_state;
+	struct list_head rd_pending;
+	struct list_head rd_completed;
+
+	/* MEI CL bus data */
+	struct mei_cl_device *device;
+	struct list_head device_link;
+};
+
+/** struct mei_hw_ops
+ *
+ * @host_is_ready    : query for host readiness
+
+ * @hw_is_ready      : query if hw is ready
+ * @hw_reset         : reset hw
+ * @hw_start         : start hw after reset
+ * @hw_config        : configure hw
+
+ * @fw_status        : get fw status registers
+ * @pg_state         : power gating state of the device
+ * @pg_in_transition : is device now in pg transition
+ * @pg_is_enabled    : is power gating enabled
+
+ * @intr_clear       : clear pending interrupts
+ * @intr_enable      : enable interrupts
+ * @intr_disable     : disable interrupts
+
+ * @hbuf_free_slots  : query for write buffer empty slots
+ * @hbuf_is_ready    : query if write buffer is empty
+ * @hbuf_max_len     : query for write buffer max len
+
+ * @write            : write a message to FW
+
+ * @rdbuf_full_slots : query how many slots are filled
+
+ * @read_hdr         : get first 4 bytes (header)
+ * @read             : read a buffer from the FW
+ */
+struct mei_hw_ops {
+
+	bool (*host_is_ready)(struct mei_device *dev);
+
+	bool (*hw_is_ready)(struct mei_device *dev);
+	int (*hw_reset)(struct mei_device *dev, bool enable);
+	int (*hw_start)(struct mei_device *dev);
+	void (*hw_config)(struct mei_device *dev);
+
+
+	int (*fw_status)(struct mei_device *dev, struct mei_fw_status *fw_sts);
+	enum mei_pg_state (*pg_state)(struct mei_device *dev);
+	bool (*pg_in_transition)(struct mei_device *dev);
+	bool (*pg_is_enabled)(struct mei_device *dev);
+
+	void (*intr_clear)(struct mei_device *dev);
+	void (*intr_enable)(struct mei_device *dev);
+	void (*intr_disable)(struct mei_device *dev);
+
+	int (*hbuf_free_slots)(struct mei_device *dev);
+	bool (*hbuf_is_ready)(struct mei_device *dev);
+	size_t (*hbuf_max_len)(const struct mei_device *dev);
+
+	int (*write)(struct mei_device *dev,
+		     struct mei_msg_hdr *hdr,
+		     unsigned char *buf);
+
+	int (*rdbuf_full_slots)(struct mei_device *dev);
+
+	u32 (*read_hdr)(const struct mei_device *dev);
+	int (*read)(struct mei_device *dev,
+		     unsigned char *buf, unsigned long len);
+};
+
+/* MEI bus API*/
+
+/**
+ * struct mei_cl_ops - MEI CL device ops
+ * This structure allows ME host clients to implement technology
+ * specific operations.
+ *
+ * @enable: Enable an MEI CL device. Some devices require specific
+ *	HECI commands to initialize completely.
+ * @disable: Disable an MEI CL device.
+ * @send: Tx hook for the device. This allows ME host clients to trap
+ *	the device driver buffers before actually physically
+ *	pushing it to the ME.
+ * @recv: Rx hook for the device. This allows ME host clients to trap the
+ *	ME buffers before forwarding them to the device driver.
+ */
+struct mei_cl_ops {
+	int (*enable)(struct mei_cl_device *device);
+	int (*disable)(struct mei_cl_device *device);
+	int (*send)(struct mei_cl_device *device, u8 *buf, size_t length);
+	int (*recv)(struct mei_cl_device *device, u8 *buf, size_t length);
+};
+
+struct mei_cl_device *mei_cl_add_device(struct mei_device *dev,
+					uuid_le uuid, char *name,
+					struct mei_cl_ops *ops);
+void mei_cl_remove_device(struct mei_cl_device *device);
+
+ssize_t __mei_cl_async_send(struct mei_cl *cl, u8 *buf, size_t length);
+ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length);
+ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length);
+void mei_cl_bus_rx_event(struct mei_cl *cl);
+void mei_cl_bus_remove_devices(struct mei_device *dev);
+int mei_cl_bus_init(void);
+void mei_cl_bus_exit(void);
+struct mei_cl *mei_cl_bus_find_cl_by_uuid(struct mei_device *dev, uuid_le uuid);
+
+
+/**
+ * struct mei_cl_device - MEI device handle
+ * An mei_cl_device pointer is returned from mei_add_device()
+ * and links MEI bus clients to their actual ME host client pointer.
+ * Drivers for MEI devices will get an mei_cl_device pointer
+ * when being probed and shall use it for doing ME bus I/O.
+ *
+ * @dev: linux driver model device pointer
+ * @cl: mei client
+ * @ops: ME transport ops
+ * @event_work: async work to execute event callback
+ * @event_cb: Drivers register this callback to get asynchronous ME
+ *	events (e.g. Rx buffer pending) notifications.
+ * @event_context: event callback run context
+ * @events: Events bitmask sent to the driver.
+ * @priv_data: client private data
+ */
+struct mei_cl_device {
+	struct device dev;
+
+	struct mei_cl *cl;
+
+	const struct mei_cl_ops *ops;
+
+	struct work_struct event_work;
+	mei_cl_event_cb_t event_cb;
+	void *event_context;
+	unsigned long events;
+
+	void *priv_data;
+};
+
+
+/**
+ * enum mei_pg_event - power gating transition events
+ *
+ * @MEI_PG_EVENT_IDLE: the driver is not in power gating transition
+ * @MEI_PG_EVENT_WAIT: the driver is waiting for a pg event to complete
+ * @MEI_PG_EVENT_RECEIVED: the driver received pg event
+ * @MEI_PG_EVENT_INTR_WAIT: the driver is waiting for a pg event interrupt
+ * @MEI_PG_EVENT_INTR_RECEIVED: the driver received pg event interrupt
+ */
+enum mei_pg_event {
+	MEI_PG_EVENT_IDLE,
+	MEI_PG_EVENT_WAIT,
+	MEI_PG_EVENT_RECEIVED,
+	MEI_PG_EVENT_INTR_WAIT,
+	MEI_PG_EVENT_INTR_RECEIVED,
+};
+
+/**
+ * enum mei_pg_state - device internal power gating state
+ *
+ * @MEI_PG_OFF: device is not power gated - it is active
+ * @MEI_PG_ON:  device is power gated - it is in lower power state
+ */
+enum mei_pg_state {
+	MEI_PG_OFF = 0,
+	MEI_PG_ON =  1,
+};
+
+const char *mei_pg_state_str(enum mei_pg_state state);
+
+/**
+ * struct mei_device -  MEI private device struct
+ *
+ * @dev         : device on a bus
+ * @cdev        : character device
+ * @minor       : minor number allocated for device
+ *
+ * @write_list  : write pending list
+ * @write_waiting_list : write completion list
+ * @ctrl_wr_list : pending control write list
+ * @ctrl_rd_list : pending control read list
+ *
+ * @file_list   : list of opened handles
+ * @open_handle_count: number of opened handles
+ *
+ * @device_lock : big device lock
+ * @timer_work  : MEI timer delayed work (timeouts)
+ *
+ * @recvd_hw_ready : hw ready message received flag
+ *
+ * @wait_hw_ready : wait queue for receive HW ready message form FW
+ * @wait_pg     : wait queue for receive PG message from FW
+ * @wait_hbm_start : wait queue for receive HBM start message from FW
+ * @wait_stop_wd : wait queue for receive WD stop message from FW
+ *
+ * @reset_count : number of consecutive resets
+ * @dev_state   : device state
+ * @hbm_state   : state of host bus message protocol
+ * @init_clients_timer : HBM init handshake timeout
+ *
+ * @pg_event    : power gating event
+ * @pg_domain   : runtime PM domain
+ *
+ * @rd_msg_buf  : control messages buffer
+ * @rd_msg_hdr  : read message header storage
+ *
+ * @hbuf_depth  : depth of hardware host/write buffer is slots
+ * @hbuf_is_ready : query if the host host/write buffer is ready
+ * @wr_msg      : the buffer for hbm control messages
+ *
+ * @version     : HBM protocol version in use
+ * @hbm_f_pg_supported : hbm feature pgi protocol
+ *
+ * @me_clients_rwsem: rw lock over me_clients list
+ * @me_clients  : list of FW clients
+ * @me_clients_map : FW clients bit map
+ * @host_clients_map : host clients id pool
+ * @me_client_index : last FW client index in enumeration
+ *
+ * @wd_cl       : watchdog client
+ * @wd_state    : watchdog client state
+ * @wd_pending  : watchdog command is pending
+ * @wd_timeout  : watchdog expiration timeout
+ * @wd_data     : watchdog message buffer
+ *
+ * @amthif_cmd_list : amthif list for cmd waiting
+ * @amthif_rd_complete_list : amthif list for reading completed cmd data
+ * @iamthif_file_object : file for current amthif operation
+ * @iamthif_cl  : amthif host client
+ * @iamthif_current_cb : amthif current operation callback
+ * @iamthif_open_count : number of opened amthif connections
+ * @iamthif_mtu : amthif client max message length
+ * @iamthif_timer : time stamp of current amthif command completion
+ * @iamthif_stall_timer : timer to detect amthif hang
+ * @iamthif_state : amthif processor state
+ * @iamthif_canceled : current amthif command is canceled
+ *
+ * @init_work   : work item for the device init
+ * @reset_work  : work item for the device reset
+ *
+ * @device_list : mei client bus list
+ *
+ * @dbgfs_dir   : debugfs mei root directory
+ *
+ * @ops:        : hw specific operations
+ * @hw          : hw specific data
+ */
+struct mei_device {
+	struct device *dev;
+	struct cdev cdev;
+	int minor;
+
+	struct mei_cl_cb write_list;
+	struct mei_cl_cb write_waiting_list;
+	struct mei_cl_cb ctrl_wr_list;
+	struct mei_cl_cb ctrl_rd_list;
+
+	struct list_head file_list;
+	long open_handle_count;
+
+	struct mutex device_lock;
+	struct delayed_work timer_work;
+
+	bool recvd_hw_ready;
+	/*
+	 * waiting queue for receive message from FW
+	 */
+	wait_queue_head_t wait_hw_ready;
+	wait_queue_head_t wait_pg;
+	wait_queue_head_t wait_hbm_start;
+	wait_queue_head_t wait_stop_wd;
+
+	/*
+	 * mei device  states
+	 */
+	unsigned long reset_count;
+	enum mei_dev_state dev_state;
+	enum mei_hbm_state hbm_state;
+	u16 init_clients_timer;
+
+	/*
+	 * Power Gating support
+	 */
+	enum mei_pg_event pg_event;
+#ifdef CONFIG_PM
+	struct dev_pm_domain pg_domain;
+#endif /* CONFIG_PM */
+
+	unsigned char rd_msg_buf[MEI_RD_MSG_BUF_SIZE];
+	u32 rd_msg_hdr;
+
+	/* write buffer */
+	u8 hbuf_depth;
+	bool hbuf_is_ready;
+
+	/* used for control messages */
+	struct {
+		struct mei_msg_hdr hdr;
+		unsigned char data[128];
+	} wr_msg;
+
+	struct hbm_version version;
+	unsigned int hbm_f_pg_supported:1;
+
+	struct rw_semaphore me_clients_rwsem;
+	struct list_head me_clients;
+	DECLARE_BITMAP(me_clients_map, MEI_CLIENTS_MAX);
+	DECLARE_BITMAP(host_clients_map, MEI_CLIENTS_MAX);
+	unsigned long me_client_index;
+
+	struct mei_cl wd_cl;
+	enum mei_wd_states wd_state;
+	bool wd_pending;
+	u16 wd_timeout;
+	unsigned char wd_data[MEI_WD_START_MSG_SIZE];
+
+
+	/* amthif list for cmd waiting */
+	struct mei_cl_cb amthif_cmd_list;
+	/* driver managed amthif list for reading completed amthif cmd data */
+	struct mei_cl_cb amthif_rd_complete_list;
+	struct file *iamthif_file_object;
+	struct mei_cl iamthif_cl;
+	struct mei_cl_cb *iamthif_current_cb;
+	long iamthif_open_count;
+	int iamthif_mtu;
+	unsigned long iamthif_timer;
+	u32 iamthif_stall_timer;
+	enum iamthif_states iamthif_state;
+	bool iamthif_canceled;
+
+	struct work_struct init_work;
+	struct work_struct reset_work;
+
+	/* List of bus devices */
+	struct list_head device_list;
+
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+	struct dentry *dbgfs_dir;
+#endif /* CONFIG_DEBUG_FS */
+
+
+	const struct mei_hw_ops *ops;
+	char hw[0] __aligned(sizeof(void *));
+};
+
+static inline unsigned long mei_secs_to_jiffies(unsigned long sec)
+{
+	return msecs_to_jiffies(sec * MSEC_PER_SEC);
+}
+
+/**
+ * mei_data2slots - get slots - number of (dwords) from a message length
+ *	+ size of the mei header
+ *
+ * @length: size of the messages in bytes
+ *
+ * Return: number of slots
+ */
+static inline u32 mei_data2slots(size_t length)
+{
+	return DIV_ROUND_UP(sizeof(struct mei_msg_hdr) + length, 4);
+}
+
+/**
+ * mei_slots2data - get data in slots - bytes from slots
+ *
+ * @slots: number of available slots
+ *
+ * Return: number of bytes in slots
+ */
+static inline u32 mei_slots2data(int slots)
+{
+	return slots * 4;
+}
+
+/*
+ * mei init function prototypes
+ */
+void mei_device_init(struct mei_device *dev,
+		     struct device *device,
+		     const struct mei_hw_ops *hw_ops);
+int mei_reset(struct mei_device *dev);
+int mei_start(struct mei_device *dev);
+int mei_restart(struct mei_device *dev);
+void mei_stop(struct mei_device *dev);
+void mei_cancel_work(struct mei_device *dev);
+
+/*
+ *  MEI interrupt functions prototype
+ */
+
+void mei_timer(struct work_struct *work);
+int mei_irq_read_handler(struct mei_device *dev,
+		struct mei_cl_cb *cmpl_list, s32 *slots);
+
+int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list);
+void mei_irq_compl_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list);
+
+/*
+ * AMTHIF - AMT Host Interface Functions
+ */
+void mei_amthif_reset_params(struct mei_device *dev);
+
+int mei_amthif_host_init(struct mei_device *dev);
+
+int mei_amthif_read(struct mei_device *dev, struct file *file,
+		char __user *ubuf, size_t length, loff_t *offset);
+
+unsigned int mei_amthif_poll(struct mei_device *dev,
+		struct file *file, poll_table *wait);
+
+int mei_amthif_release(struct mei_device *dev, struct file *file);
+
+struct mei_cl_cb *mei_amthif_find_read_list_entry(struct mei_device *dev,
+						struct file *file);
+
+int mei_amthif_write(struct mei_cl *cl, struct mei_cl_cb *cb);
+int mei_amthif_run_next_cmd(struct mei_device *dev);
+int mei_amthif_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
+			struct mei_cl_cb *cmpl_list);
+
+void mei_amthif_complete(struct mei_device *dev, struct mei_cl_cb *cb);
+int mei_amthif_irq_read_msg(struct mei_cl *cl,
+			    struct mei_msg_hdr *mei_hdr,
+			    struct mei_cl_cb *complete_list);
+int mei_amthif_irq_read(struct mei_device *dev, s32 *slots);
+
+/*
+ * NFC functions
+ */
+int mei_nfc_host_init(struct mei_device *dev);
+void mei_nfc_host_exit(struct mei_device *dev);
+
+/*
+ * NFC Client UUID
+ */
+extern const uuid_le mei_nfc_guid;
+
+int mei_wd_send(struct mei_device *dev);
+int mei_wd_stop(struct mei_device *dev);
+int mei_wd_host_init(struct mei_device *dev);
+/*
+ * mei_watchdog_register  - Registering watchdog interface
+ *   once we got connection to the WD Client
+ * @dev: mei device
+ */
+int mei_watchdog_register(struct mei_device *dev);
+/*
+ * mei_watchdog_unregister  - Unregistering watchdog interface
+ * @dev: mei device
+ */
+void mei_watchdog_unregister(struct mei_device *dev);
+
+/*
+ * Register Access Function
+ */
+
+
+static inline void mei_hw_config(struct mei_device *dev)
+{
+	dev->ops->hw_config(dev);
+}
+
+static inline enum mei_pg_state mei_pg_state(struct mei_device *dev)
+{
+	return dev->ops->pg_state(dev);
+}
+
+static inline bool mei_pg_in_transition(struct mei_device *dev)
+{
+	return dev->ops->pg_in_transition(dev);
+}
+
+static inline bool mei_pg_is_enabled(struct mei_device *dev)
+{
+	return dev->ops->pg_is_enabled(dev);
+}
+
+static inline int mei_hw_reset(struct mei_device *dev, bool enable)
+{
+	return dev->ops->hw_reset(dev, enable);
+}
+
+static inline int mei_hw_start(struct mei_device *dev)
+{
+	return dev->ops->hw_start(dev);
+}
+
+static inline void mei_clear_interrupts(struct mei_device *dev)
+{
+	dev->ops->intr_clear(dev);
+}
+
+static inline void mei_enable_interrupts(struct mei_device *dev)
+{
+	dev->ops->intr_enable(dev);
+}
+
+static inline void mei_disable_interrupts(struct mei_device *dev)
+{
+	dev->ops->intr_disable(dev);
+}
+
+static inline bool mei_host_is_ready(struct mei_device *dev)
+{
+	return dev->ops->host_is_ready(dev);
+}
+static inline bool mei_hw_is_ready(struct mei_device *dev)
+{
+	return dev->ops->hw_is_ready(dev);
+}
+
+static inline bool mei_hbuf_is_ready(struct mei_device *dev)
+{
+	return dev->ops->hbuf_is_ready(dev);
+}
+
+static inline int mei_hbuf_empty_slots(struct mei_device *dev)
+{
+	return dev->ops->hbuf_free_slots(dev);
+}
+
+static inline size_t mei_hbuf_max_len(const struct mei_device *dev)
+{
+	return dev->ops->hbuf_max_len(dev);
+}
+
+static inline int mei_write_message(struct mei_device *dev,
+			struct mei_msg_hdr *hdr,
+			unsigned char *buf)
+{
+	return dev->ops->write(dev, hdr, buf);
+}
+
+static inline u32 mei_read_hdr(const struct mei_device *dev)
+{
+	return dev->ops->read_hdr(dev);
+}
+
+static inline void mei_read_slots(struct mei_device *dev,
+		     unsigned char *buf, unsigned long len)
+{
+	dev->ops->read(dev, buf, len);
+}
+
+static inline int mei_count_full_read_slots(struct mei_device *dev)
+{
+	return dev->ops->rdbuf_full_slots(dev);
+}
+
+static inline int mei_fw_status(struct mei_device *dev,
+				struct mei_fw_status *fw_status)
+{
+	return dev->ops->fw_status(dev, fw_status);
+}
+
+bool mei_hbuf_acquire(struct mei_device *dev);
+
+bool mei_write_is_idle(struct mei_device *dev);
+
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+int mei_dbgfs_register(struct mei_device *dev, const char *name);
+void mei_dbgfs_deregister(struct mei_device *dev);
+#else
+static inline int mei_dbgfs_register(struct mei_device *dev, const char *name)
+{
+	return 0;
+}
+static inline void mei_dbgfs_deregister(struct mei_device *dev) {}
+#endif /* CONFIG_DEBUG_FS */
+
+int mei_register(struct mei_device *dev, struct device *parent);
+void mei_deregister(struct mei_device *dev);
+
+#define MEI_HDR_FMT "hdr:host=%02d me=%02d len=%d internal=%1d comp=%1d"
+#define MEI_HDR_PRM(hdr)                  \
+	(hdr)->host_addr, (hdr)->me_addr, \
+	(hdr)->length, (hdr)->internal, (hdr)->msg_complete
+
+ssize_t mei_fw_status2str(struct mei_fw_status *fw_sts, char *buf, size_t len);
+/**
+ * mei_fw_status_str - fetch and convert fw status registers to printable string
+ *
+ * @dev: the device structure
+ * @buf: string buffer at minimal size MEI_FW_STATUS_STR_SZ
+ * @len: buffer len must be >= MEI_FW_STATUS_STR_SZ
+ *
+ * Return: number of bytes written or < 0 on failure
+ */
+static inline ssize_t mei_fw_status_str(struct mei_device *dev,
+					char *buf, size_t len)
+{
+	struct mei_fw_status fw_status;
+	int ret;
+
+	buf[0] = '\0';
+
+	ret = mei_fw_status(dev, &fw_status);
+	if (ret)
+		return ret;
+
+	ret = mei_fw_status2str(&fw_status, buf, MEI_FW_STATUS_STR_SZ);
+
+	return ret;
+}
+
+
+#endif
diff --git a/drivers/misc/mei/nfc.c b/drivers/misc/mei/nfc.c
new file mode 100644
index 000000000..c3bcb6368
--- /dev/null
+++ b/drivers/misc/mei/nfc.c
@@ -0,0 +1,593 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2003-2013, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+
+#include <linux/mei_cl_bus.h>
+
+#include "mei_dev.h"
+#include "client.h"
+
+struct mei_nfc_cmd {
+	u8 command;
+	u8 status;
+	u16 req_id;
+	u32 reserved;
+	u16 data_size;
+	u8 sub_command;
+	u8 data[];
+} __packed;
+
+struct mei_nfc_reply {
+	u8 command;
+	u8 status;
+	u16 req_id;
+	u32 reserved;
+	u16 data_size;
+	u8 sub_command;
+	u8 reply_status;
+	u8 data[];
+} __packed;
+
+struct mei_nfc_if_version {
+	u8 radio_version_sw[3];
+	u8 reserved[3];
+	u8 radio_version_hw[3];
+	u8 i2c_addr;
+	u8 fw_ivn;
+	u8 vendor_id;
+	u8 radio_type;
+} __packed;
+
+struct mei_nfc_connect {
+	u8 fw_ivn;
+	u8 vendor_id;
+} __packed;
+
+struct mei_nfc_connect_resp {
+	u8 fw_ivn;
+	u8 vendor_id;
+	u16 me_major;
+	u16 me_minor;
+	u16 me_hotfix;
+	u16 me_build;
+} __packed;
+
+struct mei_nfc_hci_hdr {
+	u8 cmd;
+	u8 status;
+	u16 req_id;
+	u32 reserved;
+	u16 data_size;
+} __packed;
+
+#define MEI_NFC_CMD_MAINTENANCE 0x00
+#define MEI_NFC_CMD_HCI_SEND 0x01
+#define MEI_NFC_CMD_HCI_RECV 0x02
+
+#define MEI_NFC_SUBCMD_CONNECT    0x00
+#define MEI_NFC_SUBCMD_IF_VERSION 0x01
+
+#define MEI_NFC_HEADER_SIZE 10
+
+/**
+ * struct mei_nfc_dev - NFC mei device
+ *
+ * @cl: NFC host client
+ * @cl_info: NFC info host client
+ * @init_work: perform connection to the info client
+ * @send_wq: send completion wait queue
+ * @fw_ivn: NFC Interface Version Number
+ * @vendor_id: NFC manufacturer ID
+ * @radio_type: NFC radio type
+ * @bus_name: bus name
+ *
+ * @req_id:  message counter
+ * @recv_req_id: reception message counter
+ */
+struct mei_nfc_dev {
+	struct mei_cl *cl;
+	struct mei_cl *cl_info;
+	struct work_struct init_work;
+	wait_queue_head_t send_wq;
+	u8 fw_ivn;
+	u8 vendor_id;
+	u8 radio_type;
+	char *bus_name;
+
+	u16 req_id;
+	u16 recv_req_id;
+};
+
+/* UUIDs for NFC F/W clients */
+const uuid_le mei_nfc_guid = UUID_LE(0x0bb17a78, 0x2a8e, 0x4c50,
+				     0x94, 0xd4, 0x50, 0x26,
+				     0x67, 0x23, 0x77, 0x5c);
+
+static const uuid_le mei_nfc_info_guid = UUID_LE(0xd2de1625, 0x382d, 0x417d,
+					0x48, 0xa4, 0xef, 0xab,
+					0xba, 0x8a, 0x12, 0x06);
+
+/* Vendors */
+#define MEI_NFC_VENDOR_INSIDE 0x00
+#define MEI_NFC_VENDOR_NXP    0x01
+
+/* Radio types */
+#define MEI_NFC_VENDOR_INSIDE_UREAD 0x00
+#define MEI_NFC_VENDOR_NXP_PN544    0x01
+
+static void mei_nfc_free(struct mei_nfc_dev *ndev)
+{
+	if (!ndev)
+		return;
+
+	if (ndev->cl) {
+		list_del(&ndev->cl->device_link);
+		mei_cl_unlink(ndev->cl);
+		kfree(ndev->cl);
+	}
+
+	if (ndev->cl_info) {
+		list_del(&ndev->cl_info->device_link);
+		mei_cl_unlink(ndev->cl_info);
+		kfree(ndev->cl_info);
+	}
+
+	kfree(ndev);
+}
+
+static int mei_nfc_build_bus_name(struct mei_nfc_dev *ndev)
+{
+	struct mei_device *dev;
+
+	if (!ndev->cl)
+		return -ENODEV;
+
+	dev = ndev->cl->dev;
+
+	switch (ndev->vendor_id) {
+	case MEI_NFC_VENDOR_INSIDE:
+		switch (ndev->radio_type) {
+		case MEI_NFC_VENDOR_INSIDE_UREAD:
+			ndev->bus_name = "microread";
+			return 0;
+
+		default:
+			dev_err(dev->dev, "Unknown radio type 0x%x\n",
+				ndev->radio_type);
+
+			return -EINVAL;
+		}
+
+	case MEI_NFC_VENDOR_NXP:
+		switch (ndev->radio_type) {
+		case MEI_NFC_VENDOR_NXP_PN544:
+			ndev->bus_name = "pn544";
+			return 0;
+		default:
+			dev_err(dev->dev, "Unknown radio type 0x%x\n",
+				ndev->radio_type);
+
+			return -EINVAL;
+		}
+
+	default:
+		dev_err(dev->dev, "Unknown vendor ID 0x%x\n",
+			ndev->vendor_id);
+
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int mei_nfc_connect(struct mei_nfc_dev *ndev)
+{
+	struct mei_device *dev;
+	struct mei_cl *cl;
+	struct mei_nfc_cmd *cmd, *reply;
+	struct mei_nfc_connect *connect;
+	struct mei_nfc_connect_resp *connect_resp;
+	size_t connect_length, connect_resp_length;
+	int bytes_recv, ret;
+
+	cl = ndev->cl;
+	dev = cl->dev;
+
+	connect_length = sizeof(struct mei_nfc_cmd) +
+			sizeof(struct mei_nfc_connect);
+
+	connect_resp_length = sizeof(struct mei_nfc_cmd) +
+			sizeof(struct mei_nfc_connect_resp);
+
+	cmd = kzalloc(connect_length, GFP_KERNEL);
+	if (!cmd)
+		return -ENOMEM;
+	connect = (struct mei_nfc_connect *)cmd->data;
+
+	reply = kzalloc(connect_resp_length, GFP_KERNEL);
+	if (!reply) {
+		kfree(cmd);
+		return -ENOMEM;
+	}
+
+	connect_resp = (struct mei_nfc_connect_resp *)reply->data;
+
+	cmd->command = MEI_NFC_CMD_MAINTENANCE;
+	cmd->data_size = 3;
+	cmd->sub_command = MEI_NFC_SUBCMD_CONNECT;
+	connect->fw_ivn = ndev->fw_ivn;
+	connect->vendor_id = ndev->vendor_id;
+
+	ret = __mei_cl_send(cl, (u8 *)cmd, connect_length);
+	if (ret < 0) {
+		dev_err(dev->dev, "Could not send connect cmd\n");
+		goto err;
+	}
+
+	bytes_recv = __mei_cl_recv(cl, (u8 *)reply, connect_resp_length);
+	if (bytes_recv < 0) {
+		dev_err(dev->dev, "Could not read connect response\n");
+		ret = bytes_recv;
+		goto err;
+	}
+
+	dev_info(dev->dev, "IVN 0x%x Vendor ID 0x%x\n",
+		 connect_resp->fw_ivn, connect_resp->vendor_id);
+
+	dev_info(dev->dev, "ME FW %d.%d.%d.%d\n",
+		connect_resp->me_major, connect_resp->me_minor,
+		connect_resp->me_hotfix, connect_resp->me_build);
+
+	ret = 0;
+
+err:
+	kfree(reply);
+	kfree(cmd);
+
+	return ret;
+}
+
+static int mei_nfc_if_version(struct mei_nfc_dev *ndev)
+{
+	struct mei_device *dev;
+	struct mei_cl *cl;
+
+	struct mei_nfc_cmd cmd;
+	struct mei_nfc_reply *reply = NULL;
+	struct mei_nfc_if_version *version;
+	size_t if_version_length;
+	int bytes_recv, ret;
+
+	cl = ndev->cl_info;
+	dev = cl->dev;
+
+	memset(&cmd, 0, sizeof(struct mei_nfc_cmd));
+	cmd.command = MEI_NFC_CMD_MAINTENANCE;
+	cmd.data_size = 1;
+	cmd.sub_command = MEI_NFC_SUBCMD_IF_VERSION;
+
+	ret = __mei_cl_send(cl, (u8 *)&cmd, sizeof(struct mei_nfc_cmd));
+	if (ret < 0) {
+		dev_err(dev->dev, "Could not send IF version cmd\n");
+		return ret;
+	}
+
+	/* to be sure on the stack we alloc memory */
+	if_version_length = sizeof(struct mei_nfc_reply) +
+		sizeof(struct mei_nfc_if_version);
+
+	reply = kzalloc(if_version_length, GFP_KERNEL);
+	if (!reply)
+		return -ENOMEM;
+
+	bytes_recv = __mei_cl_recv(cl, (u8 *)reply, if_version_length);
+	if (bytes_recv < 0 || bytes_recv < sizeof(struct mei_nfc_reply)) {
+		dev_err(dev->dev, "Could not read IF version\n");
+		ret = -EIO;
+		goto err;
+	}
+
+	version = (struct mei_nfc_if_version *)reply->data;
+
+	ndev->fw_ivn = version->fw_ivn;
+	ndev->vendor_id = version->vendor_id;
+	ndev->radio_type = version->radio_type;
+
+err:
+	kfree(reply);
+	return ret;
+}
+
+static int mei_nfc_enable(struct mei_cl_device *cldev)
+{
+	struct mei_device *dev;
+	struct mei_nfc_dev *ndev;
+	int ret;
+
+	ndev = (struct mei_nfc_dev *)cldev->priv_data;
+	dev = ndev->cl->dev;
+
+	ret = mei_nfc_connect(ndev);
+	if (ret < 0) {
+		dev_err(dev->dev, "Could not connect to NFC");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int mei_nfc_disable(struct mei_cl_device *cldev)
+{
+	return 0;
+}
+
+static int mei_nfc_send(struct mei_cl_device *cldev, u8 *buf, size_t length)
+{
+	struct mei_device *dev;
+	struct mei_nfc_dev *ndev;
+	struct mei_nfc_hci_hdr *hdr;
+	u8 *mei_buf;
+	int err;
+
+	ndev = (struct mei_nfc_dev *) cldev->priv_data;
+	dev = ndev->cl->dev;
+
+	err = -ENOMEM;
+	mei_buf = kzalloc(length + MEI_NFC_HEADER_SIZE, GFP_KERNEL);
+	if (!mei_buf)
+		goto out;
+
+	hdr = (struct mei_nfc_hci_hdr *) mei_buf;
+	hdr->cmd = MEI_NFC_CMD_HCI_SEND;
+	hdr->status = 0;
+	hdr->req_id = ndev->req_id;
+	hdr->reserved = 0;
+	hdr->data_size = length;
+
+	memcpy(mei_buf + MEI_NFC_HEADER_SIZE, buf, length);
+	err = __mei_cl_send(ndev->cl, mei_buf, length + MEI_NFC_HEADER_SIZE);
+	if (err < 0)
+		goto out;
+
+	if (!wait_event_interruptible_timeout(ndev->send_wq,
+				ndev->recv_req_id == ndev->req_id, HZ)) {
+		dev_err(dev->dev, "NFC MEI command timeout\n");
+		err = -ETIME;
+	} else {
+		ndev->req_id++;
+	}
+out:
+	kfree(mei_buf);
+	return err;
+}
+
+static int mei_nfc_recv(struct mei_cl_device *cldev, u8 *buf, size_t length)
+{
+	struct mei_nfc_dev *ndev;
+	struct mei_nfc_hci_hdr *hci_hdr;
+	int received_length;
+
+	ndev = (struct mei_nfc_dev *)cldev->priv_data;
+
+	received_length = __mei_cl_recv(ndev->cl, buf, length);
+	if (received_length < 0)
+		return received_length;
+
+	hci_hdr = (struct mei_nfc_hci_hdr *) buf;
+
+	if (hci_hdr->cmd == MEI_NFC_CMD_HCI_SEND) {
+		ndev->recv_req_id = hci_hdr->req_id;
+		wake_up(&ndev->send_wq);
+
+		return 0;
+	}
+
+	return received_length;
+}
+
+static struct mei_cl_ops nfc_ops = {
+	.enable = mei_nfc_enable,
+	.disable = mei_nfc_disable,
+	.send = mei_nfc_send,
+	.recv = mei_nfc_recv,
+};
+
+static void mei_nfc_init(struct work_struct *work)
+{
+	struct mei_device *dev;
+	struct mei_cl_device *cldev;
+	struct mei_nfc_dev *ndev;
+	struct mei_cl *cl_info;
+
+	ndev = container_of(work, struct mei_nfc_dev, init_work);
+
+	cl_info = ndev->cl_info;
+	dev = cl_info->dev;
+
+	mutex_lock(&dev->device_lock);
+
+	if (mei_cl_connect(cl_info, NULL) < 0) {
+		mutex_unlock(&dev->device_lock);
+		dev_err(dev->dev, "Could not connect to the NFC INFO ME client");
+
+		goto err;
+	}
+
+	mutex_unlock(&dev->device_lock);
+
+	if (mei_nfc_if_version(ndev) < 0) {
+		dev_err(dev->dev, "Could not get the NFC interface version");
+
+		goto err;
+	}
+
+	dev_info(dev->dev, "NFC MEI VERSION: IVN 0x%x Vendor ID 0x%x Type 0x%x\n",
+		ndev->fw_ivn, ndev->vendor_id, ndev->radio_type);
+
+	mutex_lock(&dev->device_lock);
+
+	if (mei_cl_disconnect(cl_info) < 0) {
+		mutex_unlock(&dev->device_lock);
+		dev_err(dev->dev, "Could not disconnect the NFC INFO ME client");
+
+		goto err;
+	}
+
+	mutex_unlock(&dev->device_lock);
+
+	if (mei_nfc_build_bus_name(ndev) < 0) {
+		dev_err(dev->dev, "Could not build the bus ID name\n");
+		return;
+	}
+
+	cldev = mei_cl_add_device(dev, mei_nfc_guid, ndev->bus_name, &nfc_ops);
+	if (!cldev) {
+		dev_err(dev->dev, "Could not add the NFC device to the MEI bus\n");
+
+		goto err;
+	}
+
+	cldev->priv_data = ndev;
+
+
+	return;
+
+err:
+	mutex_lock(&dev->device_lock);
+	mei_nfc_free(ndev);
+	mutex_unlock(&dev->device_lock);
+
+}
+
+
+int mei_nfc_host_init(struct mei_device *dev)
+{
+	struct mei_nfc_dev *ndev;
+	struct mei_cl *cl_info, *cl;
+	struct mei_me_client *me_cl = NULL;
+	int ret;
+
+
+	/* in case of internal reset bail out
+	 * as the device is already setup
+	 */
+	cl = mei_cl_bus_find_cl_by_uuid(dev, mei_nfc_guid);
+	if (cl)
+		return 0;
+
+	ndev = kzalloc(sizeof(struct mei_nfc_dev), GFP_KERNEL);
+	if (!ndev) {
+		ret = -ENOMEM;
+		goto err;
+	}
+
+	/* check for valid client id */
+	me_cl = mei_me_cl_by_uuid(dev, &mei_nfc_info_guid);
+	if (!me_cl) {
+		dev_info(dev->dev, "nfc: failed to find the client\n");
+		ret = -ENOTTY;
+		goto err;
+	}
+
+	cl_info = mei_cl_alloc_linked(dev, MEI_HOST_CLIENT_ID_ANY);
+	if (IS_ERR(cl_info)) {
+		ret = PTR_ERR(cl_info);
+		goto err;
+	}
+
+	cl_info->me_client_id = me_cl->client_id;
+	cl_info->cl_uuid = me_cl->props.protocol_name;
+	mei_me_cl_put(me_cl);
+	me_cl = NULL;
+
+	list_add_tail(&cl_info->device_link, &dev->device_list);
+
+	ndev->cl_info = cl_info;
+
+	/* check for valid client id */
+	me_cl = mei_me_cl_by_uuid(dev, &mei_nfc_guid);
+	if (!me_cl) {
+		dev_info(dev->dev, "nfc: failed to find the client\n");
+		ret = -ENOTTY;
+		goto err;
+	}
+
+	cl = mei_cl_alloc_linked(dev, MEI_HOST_CLIENT_ID_ANY);
+	if (IS_ERR(cl)) {
+		ret = PTR_ERR(cl);
+		goto err;
+	}
+
+	cl->me_client_id = me_cl->client_id;
+	cl->cl_uuid = me_cl->props.protocol_name;
+	mei_me_cl_put(me_cl);
+	me_cl = NULL;
+
+	list_add_tail(&cl->device_link, &dev->device_list);
+
+	ndev->cl = cl;
+
+	ndev->req_id = 1;
+
+	INIT_WORK(&ndev->init_work, mei_nfc_init);
+	init_waitqueue_head(&ndev->send_wq);
+	schedule_work(&ndev->init_work);
+
+	return 0;
+
+err:
+	mei_me_cl_put(me_cl);
+	mei_nfc_free(ndev);
+
+	return ret;
+}
+
+void mei_nfc_host_exit(struct mei_device *dev)
+{
+	struct mei_nfc_dev *ndev;
+	struct mei_cl *cl;
+	struct mei_cl_device *cldev;
+
+	cl = mei_cl_bus_find_cl_by_uuid(dev, mei_nfc_guid);
+	if (!cl)
+		return;
+
+	cldev = cl->device;
+	if (!cldev)
+		return;
+
+	ndev = (struct mei_nfc_dev *)cldev->priv_data;
+	if (ndev)
+		cancel_work_sync(&ndev->init_work);
+
+	cldev->priv_data = NULL;
+
+	mutex_lock(&dev->device_lock);
+	/* Need to remove the device here
+	 * since mei_nfc_free will unlink the clients
+	 */
+	mei_cl_remove_device(cldev);
+	mei_nfc_free(ndev);
+	mutex_unlock(&dev->device_lock);
+}
+
+
diff --git a/drivers/misc/mei/pci-me.c b/drivers/misc/mei/pci-me.c
new file mode 100644
index 000000000..23f71f5ce
--- /dev/null
+++ b/drivers/misc/mei/pci-me.c
@@ -0,0 +1,485 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2003-2012, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/pci.h>
+#include <linux/poll.h>
+#include <linux/ioctl.h>
+#include <linux/cdev.h>
+#include <linux/sched.h>
+#include <linux/uuid.h>
+#include <linux/compat.h>
+#include <linux/jiffies.h>
+#include <linux/interrupt.h>
+
+#include <linux/pm_runtime.h>
+
+#include <linux/mei.h>
+
+#include "mei_dev.h"
+#include "client.h"
+#include "hw-me-regs.h"
+#include "hw-me.h"
+
+/* mei_pci_tbl - PCI Device ID Table */
+static const struct pci_device_id mei_me_pci_tbl[] = {
+	{MEI_PCI_DEVICE(MEI_DEV_ID_82946GZ, mei_me_legacy_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_82G35, mei_me_legacy_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_82Q965, mei_me_legacy_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_82G965, mei_me_legacy_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_82GM965, mei_me_legacy_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_82GME965, mei_me_legacy_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82Q35, mei_me_legacy_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82G33, mei_me_legacy_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82Q33, mei_me_legacy_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82X38, mei_me_legacy_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_3200, mei_me_legacy_cfg)},
+
+	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_6, mei_me_legacy_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_7, mei_me_legacy_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_8, mei_me_legacy_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_9, mei_me_legacy_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_10, mei_me_legacy_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_1, mei_me_legacy_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_2, mei_me_legacy_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_3, mei_me_legacy_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_4, mei_me_legacy_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_1, mei_me_ich_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_2, mei_me_ich_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_3, mei_me_ich_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_4, mei_me_ich_cfg)},
+
+	{MEI_PCI_DEVICE(MEI_DEV_ID_IBXPK_1, mei_me_pch_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_IBXPK_2, mei_me_pch_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_CPT_1, mei_me_pch_cpt_pbg_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_PBG_1, mei_me_pch_cpt_pbg_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_PPT_1, mei_me_pch_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_PPT_2, mei_me_pch_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_PPT_3, mei_me_pch_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_LPT_H, mei_me_pch8_sps_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_LPT_W, mei_me_pch8_sps_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_LPT_LP, mei_me_pch8_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_LPT_HR, mei_me_pch8_sps_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_WPT_LP, mei_me_pch8_cfg)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_WPT_LP_2, mei_me_pch8_cfg)},
+
+	/* required last entry */
+	{0, }
+};
+
+MODULE_DEVICE_TABLE(pci, mei_me_pci_tbl);
+
+#ifdef CONFIG_PM
+static inline void mei_me_set_pm_domain(struct mei_device *dev);
+static inline void mei_me_unset_pm_domain(struct mei_device *dev);
+#else
+static inline void mei_me_set_pm_domain(struct mei_device *dev) {}
+static inline void mei_me_unset_pm_domain(struct mei_device *dev) {}
+#endif /* CONFIG_PM */
+
+/**
+ * mei_me_quirk_probe - probe for devices that doesn't valid ME interface
+ *
+ * @pdev: PCI device structure
+ * @cfg: per generation config
+ *
+ * Return: true if ME Interface is valid, false otherwise
+ */
+static bool mei_me_quirk_probe(struct pci_dev *pdev,
+				const struct mei_cfg *cfg)
+{
+	if (cfg->quirk_probe && cfg->quirk_probe(pdev)) {
+		dev_info(&pdev->dev, "Device doesn't have valid ME Interface\n");
+		return false;
+	}
+
+	return true;
+}
+
+/**
+ * mei_me_probe - Device Initialization Routine
+ *
+ * @pdev: PCI device structure
+ * @ent: entry in kcs_pci_tbl
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+static int mei_me_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	const struct mei_cfg *cfg = (struct mei_cfg *)(ent->driver_data);
+	struct mei_device *dev;
+	struct mei_me_hw *hw;
+	int err;
+
+
+	if (!mei_me_quirk_probe(pdev, cfg))
+		return -ENODEV;
+
+	/* enable pci dev */
+	err = pci_enable_device(pdev);
+	if (err) {
+		dev_err(&pdev->dev, "failed to enable pci device.\n");
+		goto end;
+	}
+	/* set PCI host mastering  */
+	pci_set_master(pdev);
+	/* pci request regions for mei driver */
+	err = pci_request_regions(pdev, KBUILD_MODNAME);
+	if (err) {
+		dev_err(&pdev->dev, "failed to get pci regions.\n");
+		goto disable_device;
+	}
+
+	if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)) ||
+	    dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64))) {
+
+		err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
+		if (err)
+			err = dma_set_coherent_mask(&pdev->dev,
+						    DMA_BIT_MASK(32));
+	}
+	if (err) {
+		dev_err(&pdev->dev, "No usable DMA configuration, aborting\n");
+		goto release_regions;
+	}
+
+
+	/* allocates and initializes the mei dev structure */
+	dev = mei_me_dev_init(pdev, cfg);
+	if (!dev) {
+		err = -ENOMEM;
+		goto release_regions;
+	}
+	hw = to_me_hw(dev);
+	/* mapping  IO device memory */
+	hw->mem_addr = pci_iomap(pdev, 0, 0);
+	if (!hw->mem_addr) {
+		dev_err(&pdev->dev, "mapping I/O device memory failure.\n");
+		err = -ENOMEM;
+		goto free_device;
+	}
+	pci_enable_msi(pdev);
+
+	 /* request and enable interrupt */
+	if (pci_dev_msi_enabled(pdev))
+		err = request_threaded_irq(pdev->irq,
+			NULL,
+			mei_me_irq_thread_handler,
+			IRQF_ONESHOT, KBUILD_MODNAME, dev);
+	else
+		err = request_threaded_irq(pdev->irq,
+			mei_me_irq_quick_handler,
+			mei_me_irq_thread_handler,
+			IRQF_SHARED, KBUILD_MODNAME, dev);
+
+	if (err) {
+		dev_err(&pdev->dev, "request_threaded_irq failure. irq = %d\n",
+		       pdev->irq);
+		goto disable_msi;
+	}
+
+	if (mei_start(dev)) {
+		dev_err(&pdev->dev, "init hw failure.\n");
+		err = -ENODEV;
+		goto release_irq;
+	}
+
+	pm_runtime_set_autosuspend_delay(&pdev->dev, MEI_ME_RPM_TIMEOUT);
+	pm_runtime_use_autosuspend(&pdev->dev);
+
+	err = mei_register(dev, &pdev->dev);
+	if (err)
+		goto release_irq;
+
+	pci_set_drvdata(pdev, dev);
+
+	schedule_delayed_work(&dev->timer_work, HZ);
+
+	/*
+	* For not wake-able HW runtime pm framework
+	* can't be used on pci device level.
+	* Use domain runtime pm callbacks instead.
+	*/
+	if (!pci_dev_run_wake(pdev))
+		mei_me_set_pm_domain(dev);
+
+	if (mei_pg_is_enabled(dev))
+		pm_runtime_put_noidle(&pdev->dev);
+
+	dev_dbg(&pdev->dev, "initialization successful.\n");
+
+	return 0;
+
+release_irq:
+	mei_cancel_work(dev);
+	mei_disable_interrupts(dev);
+	free_irq(pdev->irq, dev);
+disable_msi:
+	pci_disable_msi(pdev);
+	pci_iounmap(pdev, hw->mem_addr);
+free_device:
+	kfree(dev);
+release_regions:
+	pci_release_regions(pdev);
+disable_device:
+	pci_disable_device(pdev);
+end:
+	dev_err(&pdev->dev, "initialization failed.\n");
+	return err;
+}
+
+/**
+ * mei_me_remove - Device Removal Routine
+ *
+ * @pdev: PCI device structure
+ *
+ * mei_remove is called by the PCI subsystem to alert the driver
+ * that it should release a PCI device.
+ */
+static void mei_me_remove(struct pci_dev *pdev)
+{
+	struct mei_device *dev;
+	struct mei_me_hw *hw;
+
+	dev = pci_get_drvdata(pdev);
+	if (!dev)
+		return;
+
+	if (mei_pg_is_enabled(dev))
+		pm_runtime_get_noresume(&pdev->dev);
+
+	hw = to_me_hw(dev);
+
+
+	dev_dbg(&pdev->dev, "stop\n");
+	mei_stop(dev);
+
+	if (!pci_dev_run_wake(pdev))
+		mei_me_unset_pm_domain(dev);
+
+	/* disable interrupts */
+	mei_disable_interrupts(dev);
+
+	free_irq(pdev->irq, dev);
+	pci_disable_msi(pdev);
+
+	if (hw->mem_addr)
+		pci_iounmap(pdev, hw->mem_addr);
+
+	mei_deregister(dev);
+
+	kfree(dev);
+
+	pci_release_regions(pdev);
+	pci_disable_device(pdev);
+
+
+}
+#ifdef CONFIG_PM_SLEEP
+static int mei_me_pci_suspend(struct device *device)
+{
+	struct pci_dev *pdev = to_pci_dev(device);
+	struct mei_device *dev = pci_get_drvdata(pdev);
+
+	if (!dev)
+		return -ENODEV;
+
+	dev_dbg(&pdev->dev, "suspend\n");
+
+	mei_stop(dev);
+
+	mei_disable_interrupts(dev);
+
+	free_irq(pdev->irq, dev);
+	pci_disable_msi(pdev);
+
+	return 0;
+}
+
+static int mei_me_pci_resume(struct device *device)
+{
+	struct pci_dev *pdev = to_pci_dev(device);
+	struct mei_device *dev;
+	int err;
+
+	dev = pci_get_drvdata(pdev);
+	if (!dev)
+		return -ENODEV;
+
+	pci_enable_msi(pdev);
+
+	/* request and enable interrupt */
+	if (pci_dev_msi_enabled(pdev))
+		err = request_threaded_irq(pdev->irq,
+			NULL,
+			mei_me_irq_thread_handler,
+			IRQF_ONESHOT, KBUILD_MODNAME, dev);
+	else
+		err = request_threaded_irq(pdev->irq,
+			mei_me_irq_quick_handler,
+			mei_me_irq_thread_handler,
+			IRQF_SHARED, KBUILD_MODNAME, dev);
+
+	if (err) {
+		dev_err(&pdev->dev, "request_threaded_irq failed: irq = %d.\n",
+				pdev->irq);
+		return err;
+	}
+
+	err = mei_restart(dev);
+	if (err)
+		return err;
+
+	/* Start timer if stopped in suspend */
+	schedule_delayed_work(&dev->timer_work, HZ);
+
+	return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+#ifdef CONFIG_PM
+static int mei_me_pm_runtime_idle(struct device *device)
+{
+	struct pci_dev *pdev = to_pci_dev(device);
+	struct mei_device *dev;
+
+	dev_dbg(&pdev->dev, "rpm: me: runtime_idle\n");
+
+	dev = pci_get_drvdata(pdev);
+	if (!dev)
+		return -ENODEV;
+	if (mei_write_is_idle(dev))
+		pm_runtime_autosuspend(device);
+
+	return -EBUSY;
+}
+
+static int mei_me_pm_runtime_suspend(struct device *device)
+{
+	struct pci_dev *pdev = to_pci_dev(device);
+	struct mei_device *dev;
+	int ret;
+
+	dev_dbg(&pdev->dev, "rpm: me: runtime suspend\n");
+
+	dev = pci_get_drvdata(pdev);
+	if (!dev)
+		return -ENODEV;
+
+	mutex_lock(&dev->device_lock);
+
+	if (mei_write_is_idle(dev))
+		ret = mei_me_pg_enter_sync(dev);
+	else
+		ret = -EAGAIN;
+
+	mutex_unlock(&dev->device_lock);
+
+	dev_dbg(&pdev->dev, "rpm: me: runtime suspend ret=%d\n", ret);
+
+	return ret;
+}
+
+static int mei_me_pm_runtime_resume(struct device *device)
+{
+	struct pci_dev *pdev = to_pci_dev(device);
+	struct mei_device *dev;
+	int ret;
+
+	dev_dbg(&pdev->dev, "rpm: me: runtime resume\n");
+
+	dev = pci_get_drvdata(pdev);
+	if (!dev)
+		return -ENODEV;
+
+	mutex_lock(&dev->device_lock);
+
+	ret = mei_me_pg_exit_sync(dev);
+
+	mutex_unlock(&dev->device_lock);
+
+	dev_dbg(&pdev->dev, "rpm: me: runtime resume ret = %d\n", ret);
+
+	return ret;
+}
+
+/**
+ * mei_me_set_pm_domain - fill and set pm domain structure for device
+ *
+ * @dev: mei_device
+ */
+static inline void mei_me_set_pm_domain(struct mei_device *dev)
+{
+	struct pci_dev *pdev  = to_pci_dev(dev->dev);
+
+	if (pdev->dev.bus && pdev->dev.bus->pm) {
+		dev->pg_domain.ops = *pdev->dev.bus->pm;
+
+		dev->pg_domain.ops.runtime_suspend = mei_me_pm_runtime_suspend;
+		dev->pg_domain.ops.runtime_resume = mei_me_pm_runtime_resume;
+		dev->pg_domain.ops.runtime_idle = mei_me_pm_runtime_idle;
+
+		pdev->dev.pm_domain = &dev->pg_domain;
+	}
+}
+
+/**
+ * mei_me_unset_pm_domain - clean pm domain structure for device
+ *
+ * @dev: mei_device
+ */
+static inline void mei_me_unset_pm_domain(struct mei_device *dev)
+{
+	/* stop using pm callbacks if any */
+	dev->dev->pm_domain = NULL;
+}
+
+static const struct dev_pm_ops mei_me_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(mei_me_pci_suspend,
+				mei_me_pci_resume)
+	SET_RUNTIME_PM_OPS(
+		mei_me_pm_runtime_suspend,
+		mei_me_pm_runtime_resume,
+		mei_me_pm_runtime_idle)
+};
+
+#define MEI_ME_PM_OPS	(&mei_me_pm_ops)
+#else
+#define MEI_ME_PM_OPS	NULL
+#endif /* CONFIG_PM */
+/*
+ *  PCI driver structure
+ */
+static struct pci_driver mei_me_driver = {
+	.name = KBUILD_MODNAME,
+	.id_table = mei_me_pci_tbl,
+	.probe = mei_me_probe,
+	.remove = mei_me_remove,
+	.shutdown = mei_me_remove,
+	.driver.pm = MEI_ME_PM_OPS,
+};
+
+module_pci_driver(mei_me_driver);
+
+MODULE_AUTHOR("Intel Corporation");
+MODULE_DESCRIPTION("Intel(R) Management Engine Interface");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/misc/mei/pci-txe.c b/drivers/misc/mei/pci-txe.c
new file mode 100644
index 000000000..dcfcba44b
--- /dev/null
+++ b/drivers/misc/mei/pci-txe.c
@@ -0,0 +1,436 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2013-2014, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/uuid.h>
+#include <linux/jiffies.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/pm_runtime.h>
+
+#include <linux/mei.h>
+
+
+#include "mei_dev.h"
+#include "hw-txe.h"
+
+static const struct pci_device_id mei_txe_pci_tbl[] = {
+	{PCI_VDEVICE(INTEL, 0x0F18)}, /* Baytrail */
+	{PCI_VDEVICE(INTEL, 0x2298)}, /* Cherrytrail */
+
+	{0, }
+};
+MODULE_DEVICE_TABLE(pci, mei_txe_pci_tbl);
+
+#ifdef CONFIG_PM
+static inline void mei_txe_set_pm_domain(struct mei_device *dev);
+static inline void mei_txe_unset_pm_domain(struct mei_device *dev);
+#else
+static inline void mei_txe_set_pm_domain(struct mei_device *dev) {}
+static inline void mei_txe_unset_pm_domain(struct mei_device *dev) {}
+#endif /* CONFIG_PM */
+
+static void mei_txe_pci_iounmap(struct pci_dev *pdev, struct mei_txe_hw *hw)
+{
+	int i;
+
+	for (i = SEC_BAR; i < NUM_OF_MEM_BARS; i++) {
+		if (hw->mem_addr[i]) {
+			pci_iounmap(pdev, hw->mem_addr[i]);
+			hw->mem_addr[i] = NULL;
+		}
+	}
+}
+/**
+ * mei_txe_probe - Device Initialization Routine
+ *
+ * @pdev: PCI device structure
+ * @ent: entry in mei_txe_pci_tbl
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+static int mei_txe_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	struct mei_device *dev;
+	struct mei_txe_hw *hw;
+	int err;
+	int i;
+
+	/* enable pci dev */
+	err = pci_enable_device(pdev);
+	if (err) {
+		dev_err(&pdev->dev, "failed to enable pci device.\n");
+		goto end;
+	}
+	/* set PCI host mastering  */
+	pci_set_master(pdev);
+	/* pci request regions for mei driver */
+	err = pci_request_regions(pdev, KBUILD_MODNAME);
+	if (err) {
+		dev_err(&pdev->dev, "failed to get pci regions.\n");
+		goto disable_device;
+	}
+
+	err = pci_set_dma_mask(pdev, DMA_BIT_MASK(36));
+	if (err) {
+		err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
+		if (err) {
+			dev_err(&pdev->dev, "No suitable DMA available.\n");
+			goto release_regions;
+		}
+	}
+
+	/* allocates and initializes the mei dev structure */
+	dev = mei_txe_dev_init(pdev);
+	if (!dev) {
+		err = -ENOMEM;
+		goto release_regions;
+	}
+	hw = to_txe_hw(dev);
+
+	/* mapping  IO device memory */
+	for (i = SEC_BAR; i < NUM_OF_MEM_BARS; i++) {
+		hw->mem_addr[i] = pci_iomap(pdev, i, 0);
+		if (!hw->mem_addr[i]) {
+			dev_err(&pdev->dev, "mapping I/O device memory failure.\n");
+			err = -ENOMEM;
+			goto free_device;
+		}
+	}
+
+
+	pci_enable_msi(pdev);
+
+	/* clear spurious interrupts */
+	mei_clear_interrupts(dev);
+
+	/* request and enable interrupt  */
+	if (pci_dev_msi_enabled(pdev))
+		err = request_threaded_irq(pdev->irq,
+			NULL,
+			mei_txe_irq_thread_handler,
+			IRQF_ONESHOT, KBUILD_MODNAME, dev);
+	else
+		err = request_threaded_irq(pdev->irq,
+			mei_txe_irq_quick_handler,
+			mei_txe_irq_thread_handler,
+			IRQF_SHARED, KBUILD_MODNAME, dev);
+	if (err) {
+		dev_err(&pdev->dev, "mei: request_threaded_irq failure. irq = %d\n",
+			pdev->irq);
+		goto free_device;
+	}
+
+	if (mei_start(dev)) {
+		dev_err(&pdev->dev, "init hw failure.\n");
+		err = -ENODEV;
+		goto release_irq;
+	}
+
+	pm_runtime_set_autosuspend_delay(&pdev->dev, MEI_TXI_RPM_TIMEOUT);
+	pm_runtime_use_autosuspend(&pdev->dev);
+
+	err = mei_register(dev, &pdev->dev);
+	if (err)
+		goto release_irq;
+
+	pci_set_drvdata(pdev, dev);
+
+	/*
+	* For not wake-able HW runtime pm framework
+	* can't be used on pci device level.
+	* Use domain runtime pm callbacks instead.
+	*/
+	if (!pci_dev_run_wake(pdev))
+		mei_txe_set_pm_domain(dev);
+
+	pm_runtime_put_noidle(&pdev->dev);
+
+	return 0;
+
+release_irq:
+
+	mei_cancel_work(dev);
+
+	/* disable interrupts */
+	mei_disable_interrupts(dev);
+
+	free_irq(pdev->irq, dev);
+	pci_disable_msi(pdev);
+
+free_device:
+	mei_txe_pci_iounmap(pdev, hw);
+
+	kfree(dev);
+release_regions:
+	pci_release_regions(pdev);
+disable_device:
+	pci_disable_device(pdev);
+end:
+	dev_err(&pdev->dev, "initialization failed.\n");
+	return err;
+}
+
+/**
+ * mei_txe_remove - Device Removal Routine
+ *
+ * @pdev: PCI device structure
+ *
+ * mei_remove is called by the PCI subsystem to alert the driver
+ * that it should release a PCI device.
+ */
+static void mei_txe_remove(struct pci_dev *pdev)
+{
+	struct mei_device *dev;
+	struct mei_txe_hw *hw;
+
+	dev = pci_get_drvdata(pdev);
+	if (!dev) {
+		dev_err(&pdev->dev, "mei: dev =NULL\n");
+		return;
+	}
+
+	pm_runtime_get_noresume(&pdev->dev);
+
+	hw = to_txe_hw(dev);
+
+	mei_stop(dev);
+
+	if (!pci_dev_run_wake(pdev))
+		mei_txe_unset_pm_domain(dev);
+
+	/* disable interrupts */
+	mei_disable_interrupts(dev);
+	free_irq(pdev->irq, dev);
+	pci_disable_msi(pdev);
+
+	pci_set_drvdata(pdev, NULL);
+
+	mei_txe_pci_iounmap(pdev, hw);
+
+	mei_deregister(dev);
+
+	kfree(dev);
+
+	pci_release_regions(pdev);
+	pci_disable_device(pdev);
+}
+
+
+#ifdef CONFIG_PM_SLEEP
+static int mei_txe_pci_suspend(struct device *device)
+{
+	struct pci_dev *pdev = to_pci_dev(device);
+	struct mei_device *dev = pci_get_drvdata(pdev);
+
+	if (!dev)
+		return -ENODEV;
+
+	dev_dbg(&pdev->dev, "suspend\n");
+
+	mei_stop(dev);
+
+	mei_disable_interrupts(dev);
+
+	free_irq(pdev->irq, dev);
+	pci_disable_msi(pdev);
+
+	return 0;
+}
+
+static int mei_txe_pci_resume(struct device *device)
+{
+	struct pci_dev *pdev = to_pci_dev(device);
+	struct mei_device *dev;
+	int err;
+
+	dev = pci_get_drvdata(pdev);
+	if (!dev)
+		return -ENODEV;
+
+	pci_enable_msi(pdev);
+
+	mei_clear_interrupts(dev);
+
+	/* request and enable interrupt */
+	if (pci_dev_msi_enabled(pdev))
+		err = request_threaded_irq(pdev->irq,
+			NULL,
+			mei_txe_irq_thread_handler,
+			IRQF_ONESHOT, KBUILD_MODNAME, dev);
+	else
+		err = request_threaded_irq(pdev->irq,
+			mei_txe_irq_quick_handler,
+			mei_txe_irq_thread_handler,
+			IRQF_SHARED, KBUILD_MODNAME, dev);
+	if (err) {
+		dev_err(&pdev->dev, "request_threaded_irq failed: irq = %d.\n",
+				pdev->irq);
+		return err;
+	}
+
+	err = mei_restart(dev);
+
+	return err;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+#ifdef CONFIG_PM
+static int mei_txe_pm_runtime_idle(struct device *device)
+{
+	struct pci_dev *pdev = to_pci_dev(device);
+	struct mei_device *dev;
+
+	dev_dbg(&pdev->dev, "rpm: txe: runtime_idle\n");
+
+	dev = pci_get_drvdata(pdev);
+	if (!dev)
+		return -ENODEV;
+	if (mei_write_is_idle(dev))
+		pm_runtime_autosuspend(device);
+
+	return -EBUSY;
+}
+static int mei_txe_pm_runtime_suspend(struct device *device)
+{
+	struct pci_dev *pdev = to_pci_dev(device);
+	struct mei_device *dev;
+	int ret;
+
+	dev_dbg(&pdev->dev, "rpm: txe: runtime suspend\n");
+
+	dev = pci_get_drvdata(pdev);
+	if (!dev)
+		return -ENODEV;
+
+	mutex_lock(&dev->device_lock);
+
+	if (mei_write_is_idle(dev))
+		ret = mei_txe_aliveness_set_sync(dev, 0);
+	else
+		ret = -EAGAIN;
+
+	/*
+	 * If everything is okay we're about to enter PCI low
+	 * power state (D3) therefor we need to disable the
+	 * interrupts towards host.
+	 * However if device is not wakeable we do not enter
+	 * D-low state and we need to keep the interrupt kicking
+	 */
+	 if (!ret && pci_dev_run_wake(pdev))
+		mei_disable_interrupts(dev);
+
+	dev_dbg(&pdev->dev, "rpm: txe: runtime suspend ret=%d\n", ret);
+
+	mutex_unlock(&dev->device_lock);
+	return ret;
+}
+
+static int mei_txe_pm_runtime_resume(struct device *device)
+{
+	struct pci_dev *pdev = to_pci_dev(device);
+	struct mei_device *dev;
+	int ret;
+
+	dev_dbg(&pdev->dev, "rpm: txe: runtime resume\n");
+
+	dev = pci_get_drvdata(pdev);
+	if (!dev)
+		return -ENODEV;
+
+	mutex_lock(&dev->device_lock);
+
+	mei_enable_interrupts(dev);
+
+	ret = mei_txe_aliveness_set_sync(dev, 1);
+
+	mutex_unlock(&dev->device_lock);
+
+	dev_dbg(&pdev->dev, "rpm: txe: runtime resume ret = %d\n", ret);
+
+	return ret;
+}
+
+/**
+ * mei_txe_set_pm_domain - fill and set pm domain structure for device
+ *
+ * @dev: mei_device
+ */
+static inline void mei_txe_set_pm_domain(struct mei_device *dev)
+{
+	struct pci_dev *pdev  = to_pci_dev(dev->dev);
+
+	if (pdev->dev.bus && pdev->dev.bus->pm) {
+		dev->pg_domain.ops = *pdev->dev.bus->pm;
+
+		dev->pg_domain.ops.runtime_suspend = mei_txe_pm_runtime_suspend;
+		dev->pg_domain.ops.runtime_resume = mei_txe_pm_runtime_resume;
+		dev->pg_domain.ops.runtime_idle = mei_txe_pm_runtime_idle;
+
+		pdev->dev.pm_domain = &dev->pg_domain;
+	}
+}
+
+/**
+ * mei_txe_unset_pm_domain - clean pm domain structure for device
+ *
+ * @dev: mei_device
+ */
+static inline void mei_txe_unset_pm_domain(struct mei_device *dev)
+{
+	/* stop using pm callbacks if any */
+	dev->dev->pm_domain = NULL;
+}
+
+static const struct dev_pm_ops mei_txe_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(mei_txe_pci_suspend,
+				mei_txe_pci_resume)
+	SET_RUNTIME_PM_OPS(
+		mei_txe_pm_runtime_suspend,
+		mei_txe_pm_runtime_resume,
+		mei_txe_pm_runtime_idle)
+};
+
+#define MEI_TXE_PM_OPS	(&mei_txe_pm_ops)
+#else
+#define MEI_TXE_PM_OPS	NULL
+#endif /* CONFIG_PM */
+
+/*
+ *  PCI driver structure
+ */
+static struct pci_driver mei_txe_driver = {
+	.name = KBUILD_MODNAME,
+	.id_table = mei_txe_pci_tbl,
+	.probe = mei_txe_probe,
+	.remove = mei_txe_remove,
+	.shutdown = mei_txe_remove,
+	.driver.pm = MEI_TXE_PM_OPS,
+};
+
+module_pci_driver(mei_txe_driver);
+
+MODULE_AUTHOR("Intel Corporation");
+MODULE_DESCRIPTION("Intel(R) Trusted Execution Environment Interface");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/misc/mei/wd.c b/drivers/misc/mei/wd.c
new file mode 100644
index 000000000..2725f865c
--- /dev/null
+++ b/drivers/misc/mei/wd.c
@@ -0,0 +1,404 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2003-2012, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/device.h>
+#include <linux/sched.h>
+#include <linux/watchdog.h>
+
+#include <linux/mei.h>
+
+#include "mei_dev.h"
+#include "hbm.h"
+#include "client.h"
+
+static const u8 mei_start_wd_params[] = { 0x02, 0x12, 0x13, 0x10 };
+static const u8 mei_stop_wd_params[] = { 0x02, 0x02, 0x14, 0x10 };
+
+/*
+ * AMT Watchdog Device
+ */
+#define INTEL_AMT_WATCHDOG_ID "INTCAMT"
+
+/* UUIDs for AMT F/W clients */
+const uuid_le mei_wd_guid = UUID_LE(0x05B79A6F, 0x4628, 0x4D7F, 0x89,
+						0x9D, 0xA9, 0x15, 0x14, 0xCB,
+						0x32, 0xAB);
+
+static void mei_wd_set_start_timeout(struct mei_device *dev, u16 timeout)
+{
+	dev_dbg(dev->dev, "wd: set timeout=%d.\n", timeout);
+	memcpy(dev->wd_data, mei_start_wd_params, MEI_WD_HDR_SIZE);
+	memcpy(dev->wd_data + MEI_WD_HDR_SIZE, &timeout, sizeof(u16));
+}
+
+/**
+ * mei_wd_host_init - connect to the watchdog client
+ *
+ * @dev: the device structure
+ *
+ * Return: -ENOTTY if wd client cannot be found
+ *         -EIO if write has failed
+ *         0 on success
+ */
+int mei_wd_host_init(struct mei_device *dev)
+{
+	struct mei_cl *cl = &dev->wd_cl;
+	struct mei_me_client *me_cl;
+	int ret;
+
+	mei_cl_init(cl, dev);
+
+	dev->wd_timeout = MEI_WD_DEFAULT_TIMEOUT;
+	dev->wd_state = MEI_WD_IDLE;
+
+
+	/* check for valid client id */
+	me_cl = mei_me_cl_by_uuid(dev, &mei_wd_guid);
+	if (!me_cl) {
+		dev_info(dev->dev, "wd: failed to find the client\n");
+		return -ENOTTY;
+	}
+
+	cl->me_client_id = me_cl->client_id;
+	cl->cl_uuid = me_cl->props.protocol_name;
+	mei_me_cl_put(me_cl);
+
+	ret = mei_cl_link(cl, MEI_WD_HOST_CLIENT_ID);
+
+	if (ret < 0) {
+		dev_info(dev->dev, "wd: failed link client\n");
+		return ret;
+	}
+
+	ret = mei_cl_connect(cl, NULL);
+
+	if (ret) {
+		dev_err(dev->dev, "wd: failed to connect = %d\n", ret);
+		mei_cl_unlink(cl);
+		return ret;
+	}
+
+	ret = mei_watchdog_register(dev);
+	if (ret) {
+		mei_cl_disconnect(cl);
+		mei_cl_unlink(cl);
+	}
+	return ret;
+}
+
+/**
+ * mei_wd_send - sends watch dog message to fw.
+ *
+ * @dev: the device structure
+ *
+ * Return: 0 if success,
+ *	-EIO when message send fails
+ *	-EINVAL when invalid message is to be sent
+ *	-ENODEV on flow control failure
+ */
+int mei_wd_send(struct mei_device *dev)
+{
+	struct mei_cl *cl = &dev->wd_cl;
+	struct mei_msg_hdr hdr;
+	int ret;
+
+	hdr.host_addr = cl->host_client_id;
+	hdr.me_addr = cl->me_client_id;
+	hdr.msg_complete = 1;
+	hdr.reserved = 0;
+	hdr.internal = 0;
+
+	if (!memcmp(dev->wd_data, mei_start_wd_params, MEI_WD_HDR_SIZE))
+		hdr.length = MEI_WD_START_MSG_SIZE;
+	else if (!memcmp(dev->wd_data, mei_stop_wd_params, MEI_WD_HDR_SIZE))
+		hdr.length = MEI_WD_STOP_MSG_SIZE;
+	else {
+		dev_err(dev->dev, "wd: invalid message is to be sent, aborting\n");
+		return -EINVAL;
+	}
+
+	ret = mei_write_message(dev, &hdr, dev->wd_data);
+	if (ret) {
+		dev_err(dev->dev, "wd: write message failed\n");
+		return ret;
+	}
+
+	ret = mei_cl_flow_ctrl_reduce(cl);
+	if (ret) {
+		dev_err(dev->dev, "wd: flow_ctrl_reduce failed.\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+/**
+ * mei_wd_stop - sends watchdog stop message to fw.
+ *
+ * @dev: the device structure
+ *
+ * Return: 0 if success
+ * on error:
+ *	-EIO    when message send fails
+ *	-EINVAL when invalid message is to be sent
+ *	-ETIME  on message timeout
+ */
+int mei_wd_stop(struct mei_device *dev)
+{
+	struct mei_cl *cl = &dev->wd_cl;
+	int ret;
+
+	if (!mei_cl_is_connected(cl) ||
+	    dev->wd_state != MEI_WD_RUNNING)
+		return 0;
+
+	memcpy(dev->wd_data, mei_stop_wd_params, MEI_WD_STOP_MSG_SIZE);
+
+	dev->wd_state = MEI_WD_STOPPING;
+
+	ret = mei_cl_flow_ctrl_creds(cl);
+	if (ret < 0)
+		goto err;
+
+	if (ret && mei_hbuf_acquire(dev)) {
+		ret = mei_wd_send(dev);
+		if (ret)
+			goto err;
+		dev->wd_pending = false;
+	} else {
+		dev->wd_pending = true;
+	}
+
+	mutex_unlock(&dev->device_lock);
+
+	ret = wait_event_timeout(dev->wait_stop_wd,
+				dev->wd_state == MEI_WD_IDLE,
+				msecs_to_jiffies(MEI_WD_STOP_TIMEOUT));
+	mutex_lock(&dev->device_lock);
+	if (dev->wd_state != MEI_WD_IDLE) {
+		/* timeout */
+		ret = -ETIME;
+		dev_warn(dev->dev, "wd: stop failed to complete ret=%d\n", ret);
+		goto err;
+	}
+	dev_dbg(dev->dev, "wd: stop completed after %u msec\n",
+			MEI_WD_STOP_TIMEOUT - jiffies_to_msecs(ret));
+	return 0;
+err:
+	return ret;
+}
+
+/**
+ * mei_wd_ops_start - wd start command from the watchdog core.
+ *
+ * @wd_dev: watchdog device struct
+ *
+ * Return: 0 if success, negative errno code for failure
+ */
+static int mei_wd_ops_start(struct watchdog_device *wd_dev)
+{
+	struct mei_device *dev;
+	struct mei_cl *cl;
+	int err = -ENODEV;
+
+	dev = watchdog_get_drvdata(wd_dev);
+	if (!dev)
+		return -ENODEV;
+
+	cl = &dev->wd_cl;
+
+	mutex_lock(&dev->device_lock);
+
+	if (dev->dev_state != MEI_DEV_ENABLED) {
+		dev_dbg(dev->dev, "wd: dev_state != MEI_DEV_ENABLED  dev_state = %s\n",
+			mei_dev_state_str(dev->dev_state));
+		goto end_unlock;
+	}
+
+	if (!mei_cl_is_connected(cl)) {
+		cl_dbg(dev, cl, "MEI Driver is not connected to Watchdog Client\n");
+		goto end_unlock;
+	}
+
+	mei_wd_set_start_timeout(dev, dev->wd_timeout);
+
+	err = 0;
+end_unlock:
+	mutex_unlock(&dev->device_lock);
+	return err;
+}
+
+/**
+ * mei_wd_ops_stop -  wd stop command from the watchdog core.
+ *
+ * @wd_dev: watchdog device struct
+ *
+ * Return: 0 if success, negative errno code for failure
+ */
+static int mei_wd_ops_stop(struct watchdog_device *wd_dev)
+{
+	struct mei_device *dev;
+
+	dev = watchdog_get_drvdata(wd_dev);
+	if (!dev)
+		return -ENODEV;
+
+	mutex_lock(&dev->device_lock);
+	mei_wd_stop(dev);
+	mutex_unlock(&dev->device_lock);
+
+	return 0;
+}
+
+/**
+ * mei_wd_ops_ping - wd ping command from the watchdog core.
+ *
+ * @wd_dev: watchdog device struct
+ *
+ * Return: 0 if success, negative errno code for failure
+ */
+static int mei_wd_ops_ping(struct watchdog_device *wd_dev)
+{
+	struct mei_device *dev;
+	struct mei_cl *cl;
+	int ret;
+
+	dev = watchdog_get_drvdata(wd_dev);
+	if (!dev)
+		return -ENODEV;
+
+	cl = &dev->wd_cl;
+
+	mutex_lock(&dev->device_lock);
+
+	if (!mei_cl_is_connected(cl)) {
+		cl_err(dev, cl, "wd: not connected.\n");
+		ret = -ENODEV;
+		goto end;
+	}
+
+	dev->wd_state = MEI_WD_RUNNING;
+
+	ret = mei_cl_flow_ctrl_creds(cl);
+	if (ret < 0)
+		goto end;
+
+	/* Check if we can send the ping to HW*/
+	if (ret && mei_hbuf_acquire(dev)) {
+		dev_dbg(dev->dev, "wd: sending ping\n");
+
+		ret = mei_wd_send(dev);
+		if (ret)
+			goto end;
+		dev->wd_pending = false;
+	} else {
+		dev->wd_pending = true;
+	}
+
+end:
+	mutex_unlock(&dev->device_lock);
+	return ret;
+}
+
+/**
+ * mei_wd_ops_set_timeout - wd set timeout command from the watchdog core.
+ *
+ * @wd_dev: watchdog device struct
+ * @timeout: timeout value to set
+ *
+ * Return: 0 if success, negative errno code for failure
+ */
+static int mei_wd_ops_set_timeout(struct watchdog_device *wd_dev,
+		unsigned int timeout)
+{
+	struct mei_device *dev;
+
+	dev = watchdog_get_drvdata(wd_dev);
+	if (!dev)
+		return -ENODEV;
+
+	/* Check Timeout value */
+	if (timeout < MEI_WD_MIN_TIMEOUT || timeout > MEI_WD_MAX_TIMEOUT)
+		return -EINVAL;
+
+	mutex_lock(&dev->device_lock);
+
+	dev->wd_timeout = timeout;
+	wd_dev->timeout = timeout;
+	mei_wd_set_start_timeout(dev, dev->wd_timeout);
+
+	mutex_unlock(&dev->device_lock);
+
+	return 0;
+}
+
+/*
+ * Watchdog Device structs
+ */
+static const struct watchdog_ops wd_ops = {
+		.owner = THIS_MODULE,
+		.start = mei_wd_ops_start,
+		.stop = mei_wd_ops_stop,
+		.ping = mei_wd_ops_ping,
+		.set_timeout = mei_wd_ops_set_timeout,
+};
+static const struct watchdog_info wd_info = {
+		.identity = INTEL_AMT_WATCHDOG_ID,
+		.options = WDIOF_KEEPALIVEPING |
+			   WDIOF_SETTIMEOUT |
+			   WDIOF_ALARMONLY,
+};
+
+static struct watchdog_device amt_wd_dev = {
+		.info = &wd_info,
+		.ops = &wd_ops,
+		.timeout = MEI_WD_DEFAULT_TIMEOUT,
+		.min_timeout = MEI_WD_MIN_TIMEOUT,
+		.max_timeout = MEI_WD_MAX_TIMEOUT,
+};
+
+
+int mei_watchdog_register(struct mei_device *dev)
+{
+
+	int ret;
+
+	/* unlock to perserve correct locking order */
+	mutex_unlock(&dev->device_lock);
+	ret = watchdog_register_device(&amt_wd_dev);
+	mutex_lock(&dev->device_lock);
+	if (ret) {
+		dev_err(dev->dev, "wd: unable to register watchdog device = %d.\n",
+			ret);
+		return ret;
+	}
+
+	dev_dbg(dev->dev, "wd: successfully register watchdog interface.\n");
+	watchdog_set_drvdata(&amt_wd_dev, dev);
+	return 0;
+}
+
+void mei_watchdog_unregister(struct mei_device *dev)
+{
+	if (watchdog_get_drvdata(&amt_wd_dev) == NULL)
+		return;
+
+	watchdog_set_drvdata(&amt_wd_dev, NULL);
+	watchdog_unregister_device(&amt_wd_dev);
+}
+