Initial import

12 files changed, 7148 insertions, 0 deletions

diff --git a/drivers/staging/media/lirc/Kconfig b/drivers/staging/media/lirc/Kconfig
new file mode 100644
index 000000000..6879c4651
--- /dev/null
+++ b/drivers/staging/media/lirc/Kconfig
@@ -0,0 +1,66 @@
+#
+# LIRC driver(s) configuration
+#
+menuconfig LIRC_STAGING
+	bool "Linux Infrared Remote Control IR receiver/transmitter drivers"
+	depends on LIRC
+	help
+	  Say Y here, and all supported Linux Infrared Remote Control IR and
+	  RF receiver and transmitter drivers will be displayed. When paired
+	  with a remote control and the lirc daemon, the receiver drivers
+	  allow control of your Linux system via remote control.
+
+if LIRC_STAGING
+
+config LIRC_BT829
+        tristate "BT829 based hardware"
+	depends on LIRC && PCI
+	help
+	  Driver for the IR interface on BT829-based hardware
+
+config LIRC_IMON
+	tristate "Legacy SoundGraph iMON Receiver and Display"
+	depends on LIRC && USB
+	help
+	  Driver for the original SoundGraph iMON IR Receiver and Display
+
+	  Current generation iMON devices use the input layer imon driver.
+
+config LIRC_PARALLEL
+	tristate "Homebrew Parallel Port Receiver"
+	depends on LIRC && PARPORT
+	help
+	  Driver for Homebrew Parallel Port Receivers
+
+config LIRC_SASEM
+	tristate "Sasem USB IR Remote"
+	depends on LIRC && USB
+	help
+	  Driver for the Sasem OnAir Remocon-V or Dign HV5 HTPC IR/VFD Module
+
+config LIRC_SERIAL
+	tristate "Homebrew Serial Port Receiver"
+	depends on LIRC
+	help
+	  Driver for Homebrew Serial Port Receivers
+
+config LIRC_SERIAL_TRANSMITTER
+	bool "Serial Port Transmitter"
+	default y
+	depends on LIRC_SERIAL
+	help
+	  Serial Port Transmitter support
+
+config LIRC_SIR
+	tristate "Built-in SIR IrDA port"
+	depends on LIRC
+	help
+	  Driver for the SIR IrDA port
+
+config LIRC_ZILOG
+	tristate "Zilog/Hauppauge IR Transmitter"
+	depends on LIRC && I2C
+	help
+	  Driver for the Zilog/Hauppauge IR Transmitter, found on
+	  PVR-150/500, HVR-1200/1250/1700/1800, HD-PVR and other cards
+endif
diff --git a/drivers/staging/media/lirc/Makefile b/drivers/staging/media/lirc/Makefile
new file mode 100644
index 000000000..5430adf04
--- /dev/null
+++ b/drivers/staging/media/lirc/Makefile
@@ -0,0 +1,12 @@
+# Makefile for the lirc drivers.
+#
+
+# Each configuration option enables a list of files.
+
+obj-$(CONFIG_LIRC_BT829)	+= lirc_bt829.o
+obj-$(CONFIG_LIRC_IMON)		+= lirc_imon.o
+obj-$(CONFIG_LIRC_PARALLEL)	+= lirc_parallel.o
+obj-$(CONFIG_LIRC_SASEM)	+= lirc_sasem.o
+obj-$(CONFIG_LIRC_SERIAL)	+= lirc_serial.o
+obj-$(CONFIG_LIRC_SIR)		+= lirc_sir.o
+obj-$(CONFIG_LIRC_ZILOG)	+= lirc_zilog.o
diff --git a/drivers/staging/media/lirc/TODO b/drivers/staging/media/lirc/TODO
new file mode 100644
index 000000000..cbea5d84f
--- /dev/null
+++ b/drivers/staging/media/lirc/TODO
@@ -0,0 +1,13 @@
+- All drivers should either be ported to ir-core, or dropped entirely
+  (see drivers/media/IR/mceusb.c vs. lirc_mceusb.c in lirc cvs for an
+  example of a previously completed port).
+
+- lirc_bt829 uses registers on a Mach64 VT, which has a separate kernel
+  framebuffer driver (atyfb) and userland X driver (mach64).  It can't
+  simply be converted to a normal PCI driver, but ideally it should be
+  coordinated with the other drivers.
+
+Please send patches to:
+Jarod Wilson <jarod@wilsonet.com>
+Greg Kroah-Hartman <greg@kroah.com>
+
diff --git a/drivers/staging/media/lirc/TODO.lirc_zilog b/drivers/staging/media/lirc/TODO.lirc_zilog
new file mode 100644
index 000000000..a97800a8e
--- /dev/null
+++ b/drivers/staging/media/lirc/TODO.lirc_zilog
@@ -0,0 +1,36 @@
+1. Both ir-kbd-i2c and lirc_zilog provide support for RX events for
+the chips supported by lirc_zilog.  Before moving lirc_zilog out of staging:
+
+a. ir-kbd-i2c needs a module parameter added to allow the user to tell
+   ir-kbd-i2c to ignore Z8 IR units.
+
+b. lirc_zilog should provide Rx key presses to the rc core like ir-kbd-i2c
+   does.
+
+
+2. lirc_zilog module ref-counting need examination.  It has not been
+verified that cdev and lirc_dev will take the proper module references on
+lirc_zilog to prevent removal of lirc_zilog when the /dev/lircN device node
+is open.
+
+(The good news is ref-counting of lirc_zilog internal structures appears to be
+complete.  Testing has shown the cx18 module can be unloaded out from under
+irw + lircd + lirc_dev, with the /dev/lirc0 device node open, with no adverse
+effects.  The cx18 module could then be reloaded and irw properly began
+receiving button presses again and ir_send worked without error.)
+
+
+3. Bridge drivers, if able, should provide a chip reset() callback
+to lirc_zilog via struct IR_i2c_init_data.  cx18 and ivtv already have routines
+to perform Z8 chip resets via GPIO manipulations.  This would allow lirc_zilog
+to bring the chip back to normal when it hangs, in the same places the
+original lirc_pvr150 driver code does.  This is not strictly needed, so it
+is not required to move lirc_zilog out of staging.
+
+Note: Both lirc_zilog and ir-kbd-i2c support the Zilog Z8 for IR, as programmed
+and installed on Hauppauge products.  When working on either module, developers
+must consider at least the following bridge drivers which mention an IR Rx unit
+at address 0x71 (indicative of a Z8):
+
+	ivtv cx18 hdpvr pvrusb2 bt8xx cx88 saa7134
+
diff --git a/drivers/staging/media/lirc/lirc_bt829.c b/drivers/staging/media/lirc/lirc_bt829.c
new file mode 100644
index 000000000..44f565547
--- /dev/null
+++ b/drivers/staging/media/lirc/lirc_bt829.c
@@ -0,0 +1,404 @@
+/*
+ * Remote control driver for the TV-card based on bt829
+ *
+ *  by Leonid Froenchenko <lfroen@galileo.co.il>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/threads.h>
+#include <linux/sched.h>
+#include <linux/ioport.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+
+#include <media/lirc_dev.h>
+
+static int poll_main(void);
+static int atir_init_start(void);
+
+static void write_index(unsigned char index, unsigned int value);
+static unsigned int read_index(unsigned char index);
+
+static void do_i2c_start(void);
+static void do_i2c_stop(void);
+
+static void seems_wr_byte(unsigned char al);
+static unsigned char seems_rd_byte(void);
+
+static unsigned int read_index(unsigned char al);
+static void write_index(unsigned char ah, unsigned int edx);
+
+static void cycle_delay(int cycle);
+
+static void do_set_bits(unsigned char bl);
+static unsigned char do_get_bits(void);
+
+#define DATA_PCI_OFF 0x7FFC00
+#define WAIT_CYCLE   20
+
+#define DRIVER_NAME "lirc_bt829"
+
+static bool debug;
+
+static int atir_minor;
+static phys_addr_t pci_addr_phys;
+static unsigned char __iomem *pci_addr_lin;
+
+static struct lirc_driver atir_driver;
+
+static struct pci_dev *do_pci_probe(void)
+{
+	struct pci_dev *my_dev;
+
+	my_dev = pci_get_device(PCI_VENDOR_ID_ATI,
+				PCI_DEVICE_ID_ATI_264VT, NULL);
+	if (my_dev) {
+		pr_err("Using device: %s\n", pci_name(my_dev));
+		pci_addr_phys = 0;
+		if (my_dev->resource[0].flags & IORESOURCE_MEM) {
+			pci_addr_phys = my_dev->resource[0].start;
+			pr_info("memory at %pa\n", &pci_addr_phys);
+		}
+		if (pci_addr_phys == 0) {
+			pr_err("no memory resource ?\n");
+			pci_dev_put(my_dev);
+			return NULL;
+		}
+	} else {
+		pr_err("pci_probe failed\n");
+		return NULL;
+	}
+	return my_dev;
+}
+
+static int atir_add_to_buf(void *data, struct lirc_buffer *buf)
+{
+	unsigned char key;
+	int status;
+
+	status = poll_main();
+	key = (status >> 8) & 0xFF;
+	if (status & 0xFF) {
+		dev_dbg(atir_driver.dev, "reading key %02X\n", key);
+		lirc_buffer_write(buf, &key);
+		return 0;
+	}
+	return -ENODATA;
+}
+
+static int atir_set_use_inc(void *data)
+{
+	dev_dbg(atir_driver.dev, "driver is opened\n");
+	return 0;
+}
+
+static void atir_set_use_dec(void *data)
+{
+	dev_dbg(atir_driver.dev, "driver is closed\n");
+}
+
+int init_module(void)
+{
+	struct pci_dev *pdev;
+	int rc;
+
+	pdev = do_pci_probe();
+	if (pdev == NULL)
+		return -ENODEV;
+
+	rc = pci_enable_device(pdev);
+	if (rc)
+		goto err_put_dev;
+
+	if (!atir_init_start()) {
+		rc = -ENODEV;
+		goto err_disable;
+	}
+
+	strcpy(atir_driver.name, "ATIR");
+	atir_driver.minor       = -1;
+	atir_driver.code_length = 8;
+	atir_driver.sample_rate = 10;
+	atir_driver.data        = NULL;
+	atir_driver.add_to_buf  = atir_add_to_buf;
+	atir_driver.set_use_inc = atir_set_use_inc;
+	atir_driver.set_use_dec = atir_set_use_dec;
+	atir_driver.dev         = &pdev->dev;
+	atir_driver.owner       = THIS_MODULE;
+
+	atir_minor = lirc_register_driver(&atir_driver);
+	if (atir_minor < 0) {
+		pr_err("failed to register driver!\n");
+		rc = atir_minor;
+		goto err_unmap;
+	}
+	dev_dbg(atir_driver.dev, "driver is registered on minor %d\n",
+				atir_minor);
+
+	return 0;
+
+err_unmap:
+	iounmap(pci_addr_lin);
+err_disable:
+	pci_disable_device(pdev);
+err_put_dev:
+	pci_dev_put(pdev);
+	return rc;
+}
+
+
+void cleanup_module(void)
+{
+	struct pci_dev *pdev = to_pci_dev(atir_driver.dev);
+
+	lirc_unregister_driver(atir_minor);
+	iounmap(pci_addr_lin);
+	pci_disable_device(pdev);
+	pci_dev_put(pdev);
+}
+
+
+static int atir_init_start(void)
+{
+	pci_addr_lin = ioremap(pci_addr_phys + DATA_PCI_OFF, 0x400);
+	if (!pci_addr_lin) {
+		pr_info("pci mem must be mapped\n");
+		return 0;
+	}
+	return 1;
+}
+
+static void cycle_delay(int cycle)
+{
+	udelay(WAIT_CYCLE*cycle);
+}
+
+
+static int poll_main(void)
+{
+	unsigned char status_high, status_low;
+
+	do_i2c_start();
+
+	seems_wr_byte(0xAA);
+	seems_wr_byte(0x01);
+
+	do_i2c_start();
+
+	seems_wr_byte(0xAB);
+
+	status_low = seems_rd_byte();
+	status_high = seems_rd_byte();
+
+	do_i2c_stop();
+
+	return (status_high << 8) | status_low;
+}
+
+static void do_i2c_start(void)
+{
+	do_set_bits(3);
+	cycle_delay(4);
+
+	do_set_bits(1);
+	cycle_delay(7);
+
+	do_set_bits(0);
+	cycle_delay(2);
+}
+
+static void do_i2c_stop(void)
+{
+	unsigned char bits;
+
+	bits =  do_get_bits() & 0xFD;
+	do_set_bits(bits);
+	cycle_delay(1);
+
+	bits |= 1;
+	do_set_bits(bits);
+	cycle_delay(2);
+
+	bits |= 2;
+	do_set_bits(bits);
+	bits = 3;
+	do_set_bits(bits);
+	cycle_delay(2);
+}
+
+static void seems_wr_byte(unsigned char value)
+{
+	int i;
+	unsigned char reg;
+
+	reg = do_get_bits();
+	for (i = 0; i < 8; i++) {
+		if (value & 0x80)
+			reg |= 0x02;
+		else
+			reg &= 0xFD;
+
+		do_set_bits(reg);
+		cycle_delay(1);
+
+		reg |= 1;
+		do_set_bits(reg);
+		cycle_delay(1);
+
+		reg &= 0xFE;
+		do_set_bits(reg);
+		cycle_delay(1);
+		value <<= 1;
+	}
+	cycle_delay(2);
+
+	reg |= 2;
+	do_set_bits(reg);
+
+	reg |= 1;
+	do_set_bits(reg);
+
+	cycle_delay(1);
+	do_get_bits();
+
+	reg &= 0xFE;
+	do_set_bits(reg);
+	cycle_delay(3);
+}
+
+static unsigned char seems_rd_byte(void)
+{
+	int i;
+	int rd_byte;
+	unsigned char bits_2, bits_1;
+
+	bits_1 = do_get_bits() | 2;
+	do_set_bits(bits_1);
+
+	rd_byte = 0;
+	for (i = 0; i < 8; i++) {
+		bits_1 &= 0xFE;
+		do_set_bits(bits_1);
+		cycle_delay(2);
+
+		bits_1 |= 1;
+		do_set_bits(bits_1);
+		cycle_delay(1);
+
+		bits_2 = do_get_bits();
+		if (bits_2 & 2)
+			rd_byte |= 1;
+
+		rd_byte <<= 1;
+	}
+
+	bits_1 = 0;
+	if (bits_2 == 0)
+		bits_1 |= 2;
+
+	do_set_bits(bits_1);
+	cycle_delay(2);
+
+	bits_1 |= 1;
+	do_set_bits(bits_1);
+	cycle_delay(3);
+
+	bits_1 &= 0xFE;
+	do_set_bits(bits_1);
+	cycle_delay(2);
+
+	rd_byte >>= 1;
+	rd_byte &= 0xFF;
+	return rd_byte;
+}
+
+static void do_set_bits(unsigned char new_bits)
+{
+	int reg_val;
+
+	reg_val = read_index(0x34);
+	if (new_bits & 2) {
+		reg_val &= 0xFFFFFFDF;
+		reg_val |= 1;
+	} else {
+		reg_val &= 0xFFFFFFFE;
+		reg_val |= 0x20;
+	}
+	reg_val |= 0x10;
+	write_index(0x34, reg_val);
+
+	reg_val = read_index(0x31);
+	if (new_bits & 1)
+		reg_val |= 0x1000000;
+	else
+		reg_val &= 0xFEFFFFFF;
+
+	reg_val |= 0x8000000;
+	write_index(0x31, reg_val);
+}
+
+static unsigned char do_get_bits(void)
+{
+	unsigned char bits;
+	int reg_val;
+
+	reg_val = read_index(0x34);
+	reg_val |= 0x10;
+	reg_val &= 0xFFFFFFDF;
+	write_index(0x34, reg_val);
+
+	reg_val = read_index(0x34);
+	bits = 0;
+	if (reg_val & 8)
+		bits |= 2;
+	else
+		bits &= 0xFD;
+
+	reg_val = read_index(0x31);
+	if (reg_val & 0x1000000)
+		bits |= 1;
+	else
+		bits &= 0xFE;
+
+	return bits;
+}
+
+static unsigned int read_index(unsigned char index)
+{
+	unsigned char __iomem *addr;
+	/*  addr = pci_addr_lin + DATA_PCI_OFF + ((index & 0xFF) << 2); */
+	addr = pci_addr_lin + ((index & 0xFF) << 2);
+	return readl(addr);
+}
+
+static void write_index(unsigned char index, unsigned int reg_val)
+{
+	unsigned char __iomem *addr;
+
+	addr = pci_addr_lin + ((index & 0xFF) << 2);
+	writel(reg_val, addr);
+}
+
+MODULE_AUTHOR("Froenchenko Leonid");
+MODULE_DESCRIPTION("IR remote driver for bt829 based TV cards");
+MODULE_LICENSE("GPL");
+
+module_param(debug, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Debug enabled or not");
diff --git a/drivers/staging/media/lirc/lirc_imon.c b/drivers/staging/media/lirc/lirc_imon.c
new file mode 100644
index 000000000..335b98a54
--- /dev/null
+++ b/drivers/staging/media/lirc/lirc_imon.c
@@ -0,0 +1,1002 @@
+/*
+ *   lirc_imon.c:  LIRC/VFD/LCD driver for SoundGraph iMON IR/VFD/LCD
+ *		   including the iMON PAD model
+ *
+ *   Copyright(C) 2004  Venky Raju(dev@venky.ws)
+ *   Copyright(C) 2009  Jarod Wilson <jarod@wilsonet.com>
+ *
+ *   lirc_imon is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/usb.h>
+
+#include <media/lirc.h>
+#include <media/lirc_dev.h>
+
+
+#define MOD_AUTHOR	"Venky Raju <dev@venky.ws>"
+#define MOD_DESC	"Driver for SoundGraph iMON MultiMedia IR/Display"
+#define MOD_NAME	"lirc_imon"
+#define MOD_VERSION	"0.8"
+
+#define DISPLAY_MINOR_BASE	144
+#define DEVICE_NAME	"lcd%d"
+
+#define BUF_CHUNK_SIZE	4
+#define BUF_SIZE	128
+
+#define BIT_DURATION	250	/* each bit received is 250us */
+
+/*** P R O T O T Y P E S ***/
+
+/* USB Callback prototypes */
+static int imon_probe(struct usb_interface *interface,
+		      const struct usb_device_id *id);
+static void imon_disconnect(struct usb_interface *interface);
+static void usb_rx_callback(struct urb *urb);
+static void usb_tx_callback(struct urb *urb);
+
+/* suspend/resume support */
+static int imon_resume(struct usb_interface *intf);
+static int imon_suspend(struct usb_interface *intf, pm_message_t message);
+
+/* Display file_operations function prototypes */
+static int display_open(struct inode *inode, struct file *file);
+static int display_close(struct inode *inode, struct file *file);
+
+/* VFD write operation */
+static ssize_t vfd_write(struct file *file, const char __user *buf,
+			 size_t n_bytes, loff_t *pos);
+
+/* LIRC driver function prototypes */
+static int ir_open(void *data);
+static void ir_close(void *data);
+
+/*** G L O B A L S ***/
+#define IMON_DATA_BUF_SZ	35
+
+struct imon_context {
+	struct usb_device *usbdev;
+	/* Newer devices have two interfaces */
+	int display;			/* not all controllers do */
+	int display_isopen;		/* display port has been opened */
+	int ir_isopen;			/* IR port open	*/
+	int dev_present;		/* USB device presence */
+	struct mutex ctx_lock;		/* to lock this object */
+	wait_queue_head_t remove_ok;	/* For unexpected USB disconnects */
+
+	int vfd_proto_6p;		/* some VFD require a 6th packet */
+
+	struct lirc_driver *driver;
+	struct usb_endpoint_descriptor *rx_endpoint;
+	struct usb_endpoint_descriptor *tx_endpoint;
+	struct urb *rx_urb;
+	struct urb *tx_urb;
+	unsigned char usb_rx_buf[8];
+	unsigned char usb_tx_buf[8];
+
+	struct rx_data {
+		int count;		/* length of 0 or 1 sequence */
+		int prev_bit;		/* logic level of sequence */
+		int initial_space;	/* initial space flag */
+	} rx;
+
+	struct tx_t {
+		unsigned char data_buf[IMON_DATA_BUF_SZ]; /* user data buffer */
+		struct completion finished;	/* wait for write to finish */
+		atomic_t busy;			/* write in progress */
+		int status;			/* status of tx completion */
+	} tx;
+};
+
+static const struct file_operations display_fops = {
+	.owner		= THIS_MODULE,
+	.open		= &display_open,
+	.write		= &vfd_write,
+	.release	= &display_close,
+	.llseek		= noop_llseek,
+};
+
+/*
+ * USB Device ID for iMON USB Control Boards
+ *
+ * The Windows drivers contain 6 different inf files, more or less one for
+ * each new device until the 0x0034-0x0046 devices, which all use the same
+ * driver. Some of the devices in the 34-46 range haven't been definitively
+ * identified yet. Early devices have either a TriGem Computer, Inc. or a
+ * Samsung vendor ID (0x0aa8 and 0x04e8 respectively), while all later
+ * devices use the SoundGraph vendor ID (0x15c2).
+ */
+static struct usb_device_id imon_usb_id_table[] = {
+	/* TriGem iMON (IR only) -- TG_iMON.inf */
+	{ USB_DEVICE(0x0aa8, 0x8001) },
+
+	/* SoundGraph iMON (IR only) -- sg_imon.inf */
+	{ USB_DEVICE(0x04e8, 0xff30) },
+
+	/* SoundGraph iMON VFD (IR & VFD) -- iMON_VFD.inf */
+	{ USB_DEVICE(0x0aa8, 0xffda) },
+
+	/* SoundGraph iMON SS (IR & VFD) -- iMON_SS.inf */
+	{ USB_DEVICE(0x15c2, 0xffda) },
+
+	{}
+};
+
+/* Some iMON VFD models requires a 6th packet for VFD writes */
+static struct usb_device_id vfd_proto_6p_list[] = {
+	{ USB_DEVICE(0x15c2, 0xffda) },
+	{}
+};
+
+/* Some iMON devices have no lcd/vfd, don't set one up */
+static struct usb_device_id ir_only_list[] = {
+	{ USB_DEVICE(0x0aa8, 0x8001) },
+	{ USB_DEVICE(0x04e8, 0xff30) },
+	{}
+};
+
+/* USB Device data */
+static struct usb_driver imon_driver = {
+	.name		= MOD_NAME,
+	.probe		= imon_probe,
+	.disconnect	= imon_disconnect,
+	.suspend	= imon_suspend,
+	.resume		= imon_resume,
+	.id_table	= imon_usb_id_table,
+};
+
+static struct usb_class_driver imon_class = {
+	.name		= DEVICE_NAME,
+	.fops		= &display_fops,
+	.minor_base	= DISPLAY_MINOR_BASE,
+};
+
+/* to prevent races between open() and disconnect(), probing, etc */
+static DEFINE_MUTEX(driver_lock);
+
+static int debug;
+
+/***  M O D U L E   C O D E ***/
+
+MODULE_AUTHOR(MOD_AUTHOR);
+MODULE_DESCRIPTION(MOD_DESC);
+MODULE_VERSION(MOD_VERSION);
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(usb, imon_usb_id_table);
+module_param(debug, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Debug messages: 0=no, 1=yes(default: no)");
+
+static void free_imon_context(struct imon_context *context)
+{
+	struct device *dev = context->driver->dev;
+
+	usb_free_urb(context->tx_urb);
+	usb_free_urb(context->rx_urb);
+	lirc_buffer_free(context->driver->rbuf);
+	kfree(context->driver->rbuf);
+	kfree(context->driver);
+	kfree(context);
+
+	dev_dbg(dev, "%s: iMON context freed\n", __func__);
+}
+
+static void deregister_from_lirc(struct imon_context *context)
+{
+	int retval;
+	int minor = context->driver->minor;
+
+	retval = lirc_unregister_driver(minor);
+	if (retval)
+		dev_err(&context->usbdev->dev,
+			"unable to deregister from lirc(%d)", retval);
+	else
+		dev_info(&context->usbdev->dev,
+			 "Deregistered iMON driver (minor:%d)\n", minor);
+
+}
+
+/**
+ * Called when the Display device (e.g. /dev/lcd0)
+ * is opened by the application.
+ */
+static int display_open(struct inode *inode, struct file *file)
+{
+	struct usb_interface *interface;
+	struct imon_context *context = NULL;
+	int subminor;
+	int retval = 0;
+
+	/* prevent races with disconnect */
+	mutex_lock(&driver_lock);
+
+	subminor = iminor(inode);
+	interface = usb_find_interface(&imon_driver, subminor);
+	if (!interface) {
+		pr_err("%s: could not find interface for minor %d\n",
+		       __func__, subminor);
+		retval = -ENODEV;
+		goto exit;
+	}
+	context = usb_get_intfdata(interface);
+
+	if (!context) {
+		dev_err(&interface->dev, "no context found for minor %d\n",
+			subminor);
+		retval = -ENODEV;
+		goto exit;
+	}
+
+	mutex_lock(&context->ctx_lock);
+
+	if (!context->display) {
+		dev_err(&interface->dev,
+			"%s: display not supported by device\n", __func__);
+		retval = -ENODEV;
+	} else if (context->display_isopen) {
+		dev_err(&interface->dev,
+			"%s: display port is already open\n", __func__);
+		retval = -EBUSY;
+	} else {
+		context->display_isopen = 1;
+		file->private_data = context;
+		dev_info(context->driver->dev, "display port opened\n");
+	}
+
+	mutex_unlock(&context->ctx_lock);
+
+exit:
+	mutex_unlock(&driver_lock);
+	return retval;
+}
+
+/**
+ * Called when the display device (e.g. /dev/lcd0)
+ * is closed by the application.
+ */
+static int display_close(struct inode *inode, struct file *file)
+{
+	struct imon_context *context = NULL;
+	int retval = 0;
+
+	context = file->private_data;
+
+	if (!context) {
+		pr_err("%s: no context for device\n", __func__);
+		return -ENODEV;
+	}
+
+	mutex_lock(&context->ctx_lock);
+
+	if (!context->display) {
+		dev_err(&context->usbdev->dev,
+			"%s: display not supported by device\n", __func__);
+		retval = -ENODEV;
+	} else if (!context->display_isopen) {
+		dev_err(&context->usbdev->dev,
+			"%s: display is not open\n", __func__);
+		retval = -EIO;
+	} else {
+		context->display_isopen = 0;
+		dev_info(context->driver->dev, "display port closed\n");
+		if (!context->dev_present && !context->ir_isopen) {
+			/*
+			 * Device disconnected before close and IR port is not
+			 * open. If IR port is open, context will be deleted by
+			 * ir_close.
+			 */
+			mutex_unlock(&context->ctx_lock);
+			free_imon_context(context);
+			return retval;
+		}
+	}
+
+	mutex_unlock(&context->ctx_lock);
+	return retval;
+}
+
+/**
+ * Sends a packet to the device -- this function must be called
+ * with context->ctx_lock held.
+ */
+static int send_packet(struct imon_context *context)
+{
+	unsigned int pipe;
+	int interval = 0;
+	int retval = 0;
+
+	/* Check if we need to use control or interrupt urb */
+	pipe = usb_sndintpipe(context->usbdev,
+			      context->tx_endpoint->bEndpointAddress);
+	interval = context->tx_endpoint->bInterval;
+
+	usb_fill_int_urb(context->tx_urb, context->usbdev, pipe,
+			 context->usb_tx_buf,
+			 sizeof(context->usb_tx_buf),
+			 usb_tx_callback, context, interval);
+
+	context->tx_urb->actual_length = 0;
+
+	init_completion(&context->tx.finished);
+	atomic_set(&context->tx.busy, 1);
+
+	retval = usb_submit_urb(context->tx_urb, GFP_KERNEL);
+	if (retval) {
+		atomic_set(&context->tx.busy, 0);
+		dev_err(&context->usbdev->dev, "error submitting urb(%d)\n",
+			retval);
+	} else {
+		/* Wait for transmission to complete (or abort) */
+		mutex_unlock(&context->ctx_lock);
+		retval = wait_for_completion_interruptible(
+				&context->tx.finished);
+		if (retval)
+			dev_err(&context->usbdev->dev,
+				"%s: task interrupted\n", __func__);
+		mutex_lock(&context->ctx_lock);
+
+		retval = context->tx.status;
+		if (retval)
+			dev_err(&context->usbdev->dev,
+				"packet tx failed (%d)\n", retval);
+	}
+
+	return retval;
+}
+
+/**
+ * Writes data to the VFD.  The iMON VFD is 2x16 characters
+ * and requires data in 5 consecutive USB interrupt packets,
+ * each packet but the last carrying 7 bytes.
+ *
+ * I don't know if the VFD board supports features such as
+ * scrolling, clearing rows, blanking, etc. so at
+ * the caller must provide a full screen of data.  If fewer
+ * than 32 bytes are provided spaces will be appended to
+ * generate a full screen.
+ */
+static ssize_t vfd_write(struct file *file, const char __user *buf,
+			 size_t n_bytes, loff_t *pos)
+{
+	int i;
+	int offset;
+	int seq;
+	int retval = 0;
+	struct imon_context *context;
+	const unsigned char vfd_packet6[] = {
+		0x01, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF };
+	int *data_buf = NULL;
+
+	context = file->private_data;
+	if (!context) {
+		pr_err("%s: no context for device\n", __func__);
+		return -ENODEV;
+	}
+
+	mutex_lock(&context->ctx_lock);
+
+	if (!context->dev_present) {
+		dev_err(&context->usbdev->dev,
+			"%s: no iMON device present\n", __func__);
+		retval = -ENODEV;
+		goto exit;
+	}
+
+	if (n_bytes <= 0 || n_bytes > IMON_DATA_BUF_SZ - 3) {
+		dev_err(&context->usbdev->dev,
+			"%s: invalid payload size\n", __func__);
+		retval = -EINVAL;
+		goto exit;
+	}
+
+	data_buf = memdup_user(buf, n_bytes);
+	if (IS_ERR(data_buf)) {
+		retval = PTR_ERR(data_buf);
+		data_buf = NULL;
+		goto exit;
+	}
+
+	memcpy(context->tx.data_buf, data_buf, n_bytes);
+
+	/* Pad with spaces */
+	for (i = n_bytes; i < IMON_DATA_BUF_SZ - 3; ++i)
+		context->tx.data_buf[i] = ' ';
+
+	for (i = IMON_DATA_BUF_SZ - 3; i < IMON_DATA_BUF_SZ; ++i)
+		context->tx.data_buf[i] = 0xFF;
+
+	offset = 0;
+	seq = 0;
+
+	do {
+		memcpy(context->usb_tx_buf, context->tx.data_buf + offset, 7);
+		context->usb_tx_buf[7] = (unsigned char) seq;
+
+		retval = send_packet(context);
+		if (retval) {
+			dev_err(&context->usbdev->dev,
+				"send packet failed for packet #%d\n",
+				seq / 2);
+			goto exit;
+		} else {
+			seq += 2;
+			offset += 7;
+		}
+
+	} while (offset < IMON_DATA_BUF_SZ);
+
+	if (context->vfd_proto_6p) {
+		/* Send packet #6 */
+		memcpy(context->usb_tx_buf, &vfd_packet6, sizeof(vfd_packet6));
+		context->usb_tx_buf[7] = (unsigned char) seq;
+		retval = send_packet(context);
+		if (retval)
+			dev_err(&context->usbdev->dev,
+				"send packet failed for packet #%d\n",
+				seq / 2);
+	}
+
+exit:
+	mutex_unlock(&context->ctx_lock);
+	kfree(data_buf);
+
+	return (!retval) ? n_bytes : retval;
+}
+
+/**
+ * Callback function for USB core API: transmit data
+ */
+static void usb_tx_callback(struct urb *urb)
+{
+	struct imon_context *context;
+
+	if (!urb)
+		return;
+	context = (struct imon_context *)urb->context;
+	if (!context)
+		return;
+
+	context->tx.status = urb->status;
+
+	/* notify waiters that write has finished */
+	atomic_set(&context->tx.busy, 0);
+	complete(&context->tx.finished);
+}
+
+/**
+ * Called by lirc_dev when the application opens /dev/lirc
+ */
+static int ir_open(void *data)
+{
+	struct imon_context *context;
+
+	/* prevent races with disconnect */
+	mutex_lock(&driver_lock);
+
+	context = data;
+
+	/* initial IR protocol decode variables */
+	context->rx.count = 0;
+	context->rx.initial_space = 1;
+	context->rx.prev_bit = 0;
+
+	context->ir_isopen = 1;
+	dev_info(context->driver->dev, "IR port opened\n");
+
+	mutex_unlock(&driver_lock);
+	return 0;
+}
+
+/**
+ * Called by lirc_dev when the application closes /dev/lirc
+ */
+static void ir_close(void *data)
+{
+	struct imon_context *context;
+
+	context = data;
+	if (!context) {
+		pr_err("%s: no context for device\n", __func__);
+		return;
+	}
+
+	mutex_lock(&context->ctx_lock);
+
+	context->ir_isopen = 0;
+	dev_info(context->driver->dev, "IR port closed\n");
+
+	if (!context->dev_present) {
+		/*
+		 * Device disconnected while IR port was still open. Driver
+		 * was not deregistered at disconnect time, so do it now.
+		 */
+		deregister_from_lirc(context);
+
+		if (!context->display_isopen) {
+			mutex_unlock(&context->ctx_lock);
+			free_imon_context(context);
+			return;
+		}
+		/*
+		 * If display port is open, context will be deleted by
+		 * display_close
+		 */
+	}
+
+	mutex_unlock(&context->ctx_lock);
+}
+
+/**
+ * Convert bit count to time duration (in us) and submit
+ * the value to lirc_dev.
+ */
+static void submit_data(struct imon_context *context)
+{
+	unsigned char buf[4];
+	int value = context->rx.count;
+	int i;
+
+	dev_dbg(context->driver->dev, "submitting data to LIRC\n");
+
+	value *= BIT_DURATION;
+	value &= PULSE_MASK;
+	if (context->rx.prev_bit)
+		value |= PULSE_BIT;
+
+	for (i = 0; i < 4; ++i)
+		buf[i] = value>>(i*8);
+
+	lirc_buffer_write(context->driver->rbuf, buf);
+	wake_up(&context->driver->rbuf->wait_poll);
+}
+
+/**
+ * Process the incoming packet
+ */
+static void imon_incoming_packet(struct imon_context *context,
+				 struct urb *urb, int intf)
+{
+	int len = urb->actual_length;
+	unsigned char *buf = urb->transfer_buffer;
+	struct device *dev = context->driver->dev;
+	int octet, bit;
+	unsigned char mask;
+
+	/*
+	 * just bail out if no listening IR client
+	 */
+	if (!context->ir_isopen)
+		return;
+
+	if (len != 8) {
+		dev_warn(dev, "imon %s: invalid incoming packet size (len = %d, intf%d)\n",
+			__func__, len, intf);
+		return;
+	}
+
+	if (debug)
+		dev_info(dev, "raw packet: %*ph\n", len, buf);
+	/*
+	 * Translate received data to pulse and space lengths.
+	 * Received data is active low, i.e. pulses are 0 and
+	 * spaces are 1.
+	 *
+	 * My original algorithm was essentially similar to
+	 * Changwoo Ryu's with the exception that he switched
+	 * the incoming bits to active high and also fed an
+	 * initial space to LIRC at the start of a new sequence
+	 * if the previous bit was a pulse.
+	 *
+	 * I've decided to adopt his algorithm.
+	 */
+
+	if (buf[7] == 1 && context->rx.initial_space) {
+		/* LIRC requires a leading space */
+		context->rx.prev_bit = 0;
+		context->rx.count = 4;
+		submit_data(context);
+		context->rx.count = 0;
+	}
+
+	for (octet = 0; octet < 5; ++octet) {
+		mask = 0x80;
+		for (bit = 0; bit < 8; ++bit) {
+			int curr_bit = !(buf[octet] & mask);
+
+			if (curr_bit != context->rx.prev_bit) {
+				if (context->rx.count) {
+					submit_data(context);
+					context->rx.count = 0;
+				}
+				context->rx.prev_bit = curr_bit;
+			}
+			++context->rx.count;
+			mask >>= 1;
+		}
+	}
+
+	if (buf[7] == 10) {
+		if (context->rx.count) {
+			submit_data(context);
+			context->rx.count = 0;
+		}
+		context->rx.initial_space = context->rx.prev_bit;
+	}
+}
+
+/**
+ * Callback function for USB core API: receive data
+ */
+static void usb_rx_callback(struct urb *urb)
+{
+	struct imon_context *context;
+	int intfnum = 0;
+
+	if (!urb)
+		return;
+
+	context = (struct imon_context *)urb->context;
+	if (!context)
+		return;
+
+	switch (urb->status) {
+	case -ENOENT:		/* usbcore unlink successful! */
+		return;
+
+	case 0:
+		imon_incoming_packet(context, urb, intfnum);
+		break;
+
+	default:
+		dev_warn(context->driver->dev, "imon %s: status(%d): ignored\n",
+			 __func__, urb->status);
+		break;
+	}
+
+	usb_submit_urb(context->rx_urb, GFP_ATOMIC);
+}
+
+/**
+ * Callback function for USB core API: Probe
+ */
+static int imon_probe(struct usb_interface *interface,
+		      const struct usb_device_id *id)
+{
+	struct usb_device *usbdev = NULL;
+	struct usb_host_interface *iface_desc = NULL;
+	struct usb_endpoint_descriptor *rx_endpoint = NULL;
+	struct usb_endpoint_descriptor *tx_endpoint = NULL;
+	struct urb *rx_urb = NULL;
+	struct urb *tx_urb = NULL;
+	struct lirc_driver *driver = NULL;
+	struct lirc_buffer *rbuf = NULL;
+	struct device *dev = &interface->dev;
+	int ifnum;
+	int lirc_minor = 0;
+	int num_endpts;
+	int retval = 0;
+	int display_ep_found = 0;
+	int ir_ep_found = 0;
+	int alloc_status = 0;
+	int vfd_proto_6p = 0;
+	struct imon_context *context = NULL;
+	int i;
+	u16 vendor, product;
+
+	/* prevent races probing devices w/multiple interfaces */
+	mutex_lock(&driver_lock);
+
+	context = kzalloc(sizeof(struct imon_context), GFP_KERNEL);
+	if (!context) {
+		alloc_status = 1;
+		goto alloc_status_switch;
+	}
+
+	/*
+	 * Try to auto-detect the type of display if the user hasn't set
+	 * it by hand via the display_type modparam. Default is VFD.
+	 */
+	if (usb_match_id(interface, ir_only_list))
+		context->display = 0;
+	else
+		context->display = 1;
+
+	usbdev     = usb_get_dev(interface_to_usbdev(interface));
+	iface_desc = interface->cur_altsetting;
+	num_endpts = iface_desc->desc.bNumEndpoints;
+	ifnum      = iface_desc->desc.bInterfaceNumber;
+	vendor     = le16_to_cpu(usbdev->descriptor.idVendor);
+	product    = le16_to_cpu(usbdev->descriptor.idProduct);
+
+	dev_dbg(dev, "%s: found iMON device (%04x:%04x, intf%d)\n",
+		__func__, vendor, product, ifnum);
+
+	/*
+	 * Scan the endpoint list and set:
+	 *	first input endpoint = IR endpoint
+	 *	first output endpoint = display endpoint
+	 */
+	for (i = 0; i < num_endpts && !(ir_ep_found && display_ep_found); ++i) {
+		struct usb_endpoint_descriptor *ep;
+		int ep_dir;
+		int ep_type;
+
+		ep = &iface_desc->endpoint[i].desc;
+		ep_dir = ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK;
+		ep_type = ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
+
+		if (!ir_ep_found &&
+			ep_dir == USB_DIR_IN &&
+			ep_type == USB_ENDPOINT_XFER_INT) {
+
+			rx_endpoint = ep;
+			ir_ep_found = 1;
+			dev_dbg(dev, "%s: found IR endpoint\n", __func__);
+
+		} else if (!display_ep_found && ep_dir == USB_DIR_OUT &&
+			   ep_type == USB_ENDPOINT_XFER_INT) {
+			tx_endpoint = ep;
+			display_ep_found = 1;
+			dev_dbg(dev, "%s: found display endpoint\n", __func__);
+		}
+	}
+
+	/*
+	 * Some iMON receivers have no display. Unfortunately, it seems
+	 * that SoundGraph recycles device IDs between devices both with
+	 * and without... :\
+	 */
+	if (context->display == 0) {
+		display_ep_found = 0;
+		dev_dbg(dev, "%s: device has no display\n", __func__);
+	}
+
+	/* Input endpoint is mandatory */
+	if (!ir_ep_found) {
+		dev_err(dev, "%s: no valid input (IR) endpoint found.\n",
+			__func__);
+		retval = -ENODEV;
+		alloc_status = 2;
+		goto alloc_status_switch;
+	}
+
+	/* Determine if display requires 6 packets */
+	if (display_ep_found) {
+		if (usb_match_id(interface, vfd_proto_6p_list))
+			vfd_proto_6p = 1;
+
+		dev_dbg(dev, "%s: vfd_proto_6p: %d\n",
+			__func__, vfd_proto_6p);
+	}
+
+	driver = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
+	if (!driver) {
+		alloc_status = 2;
+		goto alloc_status_switch;
+	}
+	rbuf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
+	if (!rbuf) {
+		alloc_status = 3;
+		goto alloc_status_switch;
+	}
+	if (lirc_buffer_init(rbuf, BUF_CHUNK_SIZE, BUF_SIZE)) {
+		dev_err(dev, "%s: lirc_buffer_init failed\n", __func__);
+		alloc_status = 4;
+		goto alloc_status_switch;
+	}
+	rx_urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!rx_urb) {
+		dev_err(dev, "%s: usb_alloc_urb failed for IR urb\n", __func__);
+		alloc_status = 5;
+		goto alloc_status_switch;
+	}
+	tx_urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!tx_urb) {
+		dev_err(dev, "%s: usb_alloc_urb failed for display urb\n",
+		    __func__);
+		alloc_status = 6;
+		goto alloc_status_switch;
+	}
+
+	mutex_init(&context->ctx_lock);
+	context->vfd_proto_6p = vfd_proto_6p;
+
+	strcpy(driver->name, MOD_NAME);
+	driver->minor = -1;
+	driver->code_length = BUF_CHUNK_SIZE * 8;
+	driver->sample_rate = 0;
+	driver->features = LIRC_CAN_REC_MODE2;
+	driver->data = context;
+	driver->rbuf = rbuf;
+	driver->set_use_inc = ir_open;
+	driver->set_use_dec = ir_close;
+	driver->dev = &interface->dev;
+	driver->owner = THIS_MODULE;
+
+	mutex_lock(&context->ctx_lock);
+
+	context->driver = driver;
+	/* start out in keyboard mode */
+
+	lirc_minor = lirc_register_driver(driver);
+	if (lirc_minor < 0) {
+		dev_err(dev, "%s: lirc_register_driver failed\n", __func__);
+		alloc_status = 7;
+		goto unlock;
+	} else
+		dev_info(dev, "Registered iMON driver (lirc minor: %d)\n",
+			 lirc_minor);
+
+	/* Needed while unregistering! */
+	driver->minor = lirc_minor;
+
+	context->usbdev = usbdev;
+	context->dev_present = 1;
+	context->rx_endpoint = rx_endpoint;
+	context->rx_urb = rx_urb;
+
+	/*
+	 * tx is used to send characters to lcd/vfd, associate RF
+	 * remotes, set IR protocol, and maybe more...
+	 */
+	context->tx_endpoint = tx_endpoint;
+	context->tx_urb = tx_urb;
+
+	if (display_ep_found)
+		context->display = 1;
+
+	usb_fill_int_urb(context->rx_urb, context->usbdev,
+		usb_rcvintpipe(context->usbdev,
+			context->rx_endpoint->bEndpointAddress),
+		context->usb_rx_buf, sizeof(context->usb_rx_buf),
+		usb_rx_callback, context,
+		context->rx_endpoint->bInterval);
+
+	retval = usb_submit_urb(context->rx_urb, GFP_KERNEL);
+
+	if (retval) {
+		dev_err(dev, "usb_submit_urb failed for intf0 (%d)\n", retval);
+		alloc_status = 8;
+		goto unlock;
+	}
+
+	usb_set_intfdata(interface, context);
+
+	if (context->display && ifnum == 0) {
+		dev_dbg(dev, "%s: Registering iMON display with sysfs\n",
+			__func__);
+
+		if (usb_register_dev(interface, &imon_class)) {
+			/* Not a fatal error, so ignore */
+			dev_info(dev, "%s: could not get a minor number for display\n",
+				 __func__);
+		}
+	}
+
+	dev_info(dev, "iMON device (%04x:%04x, intf%d) on usb<%d:%d> initialized\n",
+		vendor, product, ifnum, usbdev->bus->busnum, usbdev->devnum);
+
+unlock:
+	mutex_unlock(&context->ctx_lock);
+alloc_status_switch:
+
+	switch (alloc_status) {
+	case 8:
+		lirc_unregister_driver(driver->minor);
+	case 7:
+		usb_free_urb(tx_urb);
+	case 6:
+		usb_free_urb(rx_urb);
+		/* fall-through */
+	case 5:
+		if (rbuf)
+			lirc_buffer_free(rbuf);
+		/* fall-through */
+	case 4:
+		kfree(rbuf);
+		/* fall-through */
+	case 3:
+		kfree(driver);
+		/* fall-through */
+	case 2:
+		kfree(context);
+		context = NULL;
+	case 1:
+		if (retval != -ENODEV)
+			retval = -ENOMEM;
+		break;
+	case 0:
+		retval = 0;
+	}
+
+	mutex_unlock(&driver_lock);
+
+	return retval;
+}
+
+/**
+ * Callback function for USB core API: disconnect
+ */
+static void imon_disconnect(struct usb_interface *interface)
+{
+	struct imon_context *context;
+	int ifnum;
+
+	/* prevent races with ir_open()/display_open() */
+	mutex_lock(&driver_lock);
+
+	context = usb_get_intfdata(interface);
+	ifnum = interface->cur_altsetting->desc.bInterfaceNumber;
+
+	mutex_lock(&context->ctx_lock);
+
+	usb_set_intfdata(interface, NULL);
+
+	/* Abort ongoing write */
+	if (atomic_read(&context->tx.busy)) {
+		usb_kill_urb(context->tx_urb);
+		complete_all(&context->tx.finished);
+	}
+
+	context->dev_present = 0;
+	usb_kill_urb(context->rx_urb);
+	if (context->display)
+		usb_deregister_dev(interface, &imon_class);
+
+	if (!context->ir_isopen && !context->dev_present) {
+		deregister_from_lirc(context);
+		mutex_unlock(&context->ctx_lock);
+		if (!context->display_isopen)
+			free_imon_context(context);
+	} else
+		mutex_unlock(&context->ctx_lock);
+
+	mutex_unlock(&driver_lock);
+
+	dev_info(&interface->dev, "%s: iMON device (intf%d) disconnected\n",
+		 __func__, ifnum);
+}
+
+static int imon_suspend(struct usb_interface *intf, pm_message_t message)
+{
+	struct imon_context *context = usb_get_intfdata(intf);
+
+	usb_kill_urb(context->rx_urb);
+
+	return 0;
+}
+
+static int imon_resume(struct usb_interface *intf)
+{
+	struct imon_context *context = usb_get_intfdata(intf);
+
+	usb_fill_int_urb(context->rx_urb, context->usbdev,
+		usb_rcvintpipe(context->usbdev,
+			context->rx_endpoint->bEndpointAddress),
+		context->usb_rx_buf, sizeof(context->usb_rx_buf),
+		usb_rx_callback, context,
+		context->rx_endpoint->bInterval);
+
+	return usb_submit_urb(context->rx_urb, GFP_ATOMIC);
+}
+
+module_usb_driver(imon_driver);
diff --git a/drivers/staging/media/lirc/lirc_parallel.c b/drivers/staging/media/lirc/lirc_parallel.c
new file mode 100644
index 000000000..c1408342b
--- /dev/null
+++ b/drivers/staging/media/lirc/lirc_parallel.c
@@ -0,0 +1,744 @@
+/*
+ * lirc_parallel.c
+ *
+ * lirc_parallel - device driver for infra-red signal receiving and
+ *                 transmitting unit built by the author
+ *
+ * Copyright (C) 1998 Christoph Bartelmus <lirc@bartelmus.de>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+/*** Includes ***/
+
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/ioport.h>
+#include <linux/time.h>
+#include <linux/mm.h>
+#include <linux/delay.h>
+
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/uaccess.h>
+#include <asm/div64.h>
+
+#include <linux/poll.h>
+#include <linux/parport.h>
+#include <linux/platform_device.h>
+
+#include <media/lirc.h>
+#include <media/lirc_dev.h>
+
+#include "lirc_parallel.h"
+
+#define LIRC_DRIVER_NAME "lirc_parallel"
+
+#ifndef LIRC_IRQ
+#define LIRC_IRQ 7
+#endif
+#ifndef LIRC_PORT
+#define LIRC_PORT 0x378
+#endif
+#ifndef LIRC_TIMER
+#define LIRC_TIMER 65536
+#endif
+
+/*** Global Variables ***/
+
+static bool debug;
+static bool check_pselecd;
+
+static unsigned int irq = LIRC_IRQ;
+static unsigned int io = LIRC_PORT;
+#ifdef LIRC_TIMER
+static unsigned int timer;
+static unsigned int default_timer = LIRC_TIMER;
+#endif
+
+#define RBUF_SIZE (256) /* this must be a power of 2 larger than 1 */
+
+static int rbuf[RBUF_SIZE];
+
+static DECLARE_WAIT_QUEUE_HEAD(lirc_wait);
+
+static unsigned int rptr;
+static unsigned int wptr;
+static unsigned int lost_irqs;
+static int is_open;
+
+static struct parport *pport;
+static struct pardevice *ppdevice;
+static int is_claimed;
+
+static unsigned int tx_mask = 1;
+
+/*** Internal Functions ***/
+
+static unsigned int in(int offset)
+{
+	switch (offset) {
+	case LIRC_LP_BASE:
+		return parport_read_data(pport);
+	case LIRC_LP_STATUS:
+		return parport_read_status(pport);
+	case LIRC_LP_CONTROL:
+		return parport_read_control(pport);
+	}
+	return 0; /* make compiler happy */
+}
+
+static void out(int offset, int value)
+{
+	switch (offset) {
+	case LIRC_LP_BASE:
+		parport_write_data(pport, value);
+		break;
+	case LIRC_LP_CONTROL:
+		parport_write_control(pport, value);
+		break;
+	case LIRC_LP_STATUS:
+		pr_info("attempt to write to status register\n");
+		break;
+	}
+}
+
+static unsigned int lirc_get_timer(void)
+{
+	return in(LIRC_PORT_TIMER) & LIRC_PORT_TIMER_BIT;
+}
+
+static unsigned int lirc_get_signal(void)
+{
+	return in(LIRC_PORT_SIGNAL) & LIRC_PORT_SIGNAL_BIT;
+}
+
+static void lirc_on(void)
+{
+	out(LIRC_PORT_DATA, tx_mask);
+}
+
+static void lirc_off(void)
+{
+	out(LIRC_PORT_DATA, 0);
+}
+
+static unsigned int init_lirc_timer(void)
+{
+	struct timeval tv, now;
+	unsigned int level, newlevel, timeelapsed, newtimer;
+	int count = 0;
+
+	do_gettimeofday(&tv);
+	tv.tv_sec++;                     /* wait max. 1 sec. */
+	level = lirc_get_timer();
+	do {
+		newlevel = lirc_get_timer();
+		if (level == 0 && newlevel != 0)
+			count++;
+		level = newlevel;
+		do_gettimeofday(&now);
+	} while (count < 1000 && (now.tv_sec < tv.tv_sec
+			     || (now.tv_sec == tv.tv_sec
+				 && now.tv_usec < tv.tv_usec)));
+
+	timeelapsed = (now.tv_sec + 1 - tv.tv_sec)*1000000
+		     + (now.tv_usec - tv.tv_usec);
+	if (count >= 1000 && timeelapsed > 0) {
+		if (default_timer == 0) {
+			/* autodetect timer */
+			newtimer = (1000000*count)/timeelapsed;
+			pr_info("%u Hz timer detected\n", newtimer);
+			return newtimer;
+		}
+		newtimer = (1000000*count)/timeelapsed;
+		if (abs(newtimer - default_timer) > default_timer/10) {
+			/* bad timer */
+			pr_notice("bad timer: %u Hz\n", newtimer);
+			pr_notice("using default timer: %u Hz\n",
+				  default_timer);
+			return default_timer;
+		}
+		pr_info("%u Hz timer detected\n", newtimer);
+		return newtimer; /* use detected value */
+	}
+
+	pr_notice("no timer detected\n");
+	return 0;
+}
+
+static int lirc_claim(void)
+{
+	if (parport_claim(ppdevice) != 0) {
+		pr_warn("could not claim port\n");
+		pr_warn("waiting for port becoming available\n");
+		if (parport_claim_or_block(ppdevice) < 0) {
+			pr_notice("could not claim port, giving up\n");
+			return 0;
+		}
+	}
+	out(LIRC_LP_CONTROL, LP_PSELECP|LP_PINITP);
+	is_claimed = 1;
+	return 1;
+}
+
+/*** interrupt handler ***/
+
+static void rbuf_write(int signal)
+{
+	unsigned int nwptr;
+
+	nwptr = (wptr + 1) & (RBUF_SIZE - 1);
+	if (nwptr == rptr) {
+		/* no new signals will be accepted */
+		lost_irqs++;
+		pr_notice("buffer overrun\n");
+		return;
+	}
+	rbuf[wptr] = signal;
+	wptr = nwptr;
+}
+
+static void lirc_lirc_irq_handler(void *blah)
+{
+	struct timeval tv;
+	static struct timeval lasttv;
+	static int init;
+	long signal;
+	int data;
+	unsigned int level, newlevel;
+	unsigned int timeout;
+
+	if (!is_open)
+		return;
+
+	if (!is_claimed)
+		return;
+
+#if 0
+	/* disable interrupt */
+	  disable_irq(irq);
+	  out(LIRC_PORT_IRQ, in(LIRC_PORT_IRQ) & (~LP_PINTEN));
+#endif
+	if (check_pselecd && (in(1) & LP_PSELECD))
+		return;
+
+#ifdef LIRC_TIMER
+	if (init) {
+		do_gettimeofday(&tv);
+
+		signal = tv.tv_sec - lasttv.tv_sec;
+		if (signal > 15)
+			/* really long time */
+			data = PULSE_MASK;
+		else
+			data = (int) (signal*1000000 +
+					 tv.tv_usec - lasttv.tv_usec +
+					 LIRC_SFH506_DELAY);
+
+		rbuf_write(data); /* space */
+	} else {
+		if (timer == 0) {
+			/*
+			 * wake up; we'll lose this signal, but it will be
+			 * garbage if the device is turned on anyway
+			 */
+			timer = init_lirc_timer();
+			/* enable_irq(irq); */
+			return;
+		}
+		init = 1;
+	}
+
+	timeout = timer/10;	/* timeout after 1/10 sec. */
+	signal = 1;
+	level = lirc_get_timer();
+	do {
+		newlevel = lirc_get_timer();
+		if (level == 0 && newlevel != 0)
+			signal++;
+		level = newlevel;
+
+		/* giving up */
+		if (signal > timeout
+		    || (check_pselecd && (in(1) & LP_PSELECD))) {
+			signal = 0;
+			pr_notice("timeout\n");
+			break;
+		}
+	} while (lirc_get_signal());
+
+	if (signal != 0) {
+		/* adjust value to usecs */
+		__u64 helper;
+
+		helper = ((__u64) signal)*1000000;
+		do_div(helper, timer);
+		signal = (long) helper;
+
+		if (signal > LIRC_SFH506_DELAY)
+			data = signal - LIRC_SFH506_DELAY;
+		else
+			data = 1;
+		rbuf_write(PULSE_BIT|data); /* pulse */
+	}
+	do_gettimeofday(&lasttv);
+#else
+	/* add your code here */
+#endif
+
+	wake_up_interruptible(&lirc_wait);
+
+	/* enable interrupt */
+	/*
+	  enable_irq(irq);
+	  out(LIRC_PORT_IRQ, in(LIRC_PORT_IRQ)|LP_PINTEN);
+	*/
+}
+
+/*** file operations ***/
+
+static loff_t lirc_lseek(struct file *filep, loff_t offset, int orig)
+{
+	return -ESPIPE;
+}
+
+static ssize_t lirc_read(struct file *filep, char __user *buf, size_t n,
+			 loff_t *ppos)
+{
+	int result = 0;
+	int count = 0;
+	DECLARE_WAITQUEUE(wait, current);
+
+	if (n % sizeof(int))
+		return -EINVAL;
+
+	add_wait_queue(&lirc_wait, &wait);
+	set_current_state(TASK_INTERRUPTIBLE);
+	while (count < n) {
+		if (rptr != wptr) {
+			if (copy_to_user(buf+count, &rbuf[rptr],
+					 sizeof(int))) {
+				result = -EFAULT;
+				break;
+			}
+			rptr = (rptr + 1) & (RBUF_SIZE - 1);
+			count += sizeof(int);
+		} else {
+			if (filep->f_flags & O_NONBLOCK) {
+				result = -EAGAIN;
+				break;
+			}
+			if (signal_pending(current)) {
+				result = -ERESTARTSYS;
+				break;
+			}
+			schedule();
+			set_current_state(TASK_INTERRUPTIBLE);
+		}
+	}
+	remove_wait_queue(&lirc_wait, &wait);
+	set_current_state(TASK_RUNNING);
+	return count ? count : result;
+}
+
+static ssize_t lirc_write(struct file *filep, const char __user *buf, size_t n,
+			  loff_t *ppos)
+{
+	int count;
+	unsigned int i;
+	unsigned int level, newlevel;
+	unsigned long flags;
+	int counttimer;
+	int *wbuf;
+	ssize_t ret;
+
+	if (!is_claimed)
+		return -EBUSY;
+
+	count = n / sizeof(int);
+
+	if (n % sizeof(int) || count % 2 == 0)
+		return -EINVAL;
+
+	wbuf = memdup_user(buf, n);
+	if (IS_ERR(wbuf))
+		return PTR_ERR(wbuf);
+
+#ifdef LIRC_TIMER
+	if (timer == 0) {
+		/* try again if device is ready */
+		timer = init_lirc_timer();
+		if (timer == 0) {
+			ret = -EIO;
+			goto out;
+		}
+	}
+
+	/* adjust values from usecs */
+	for (i = 0; i < count; i++) {
+		__u64 helper;
+
+		helper = ((__u64) wbuf[i])*timer;
+		do_div(helper, 1000000);
+		wbuf[i] = (int) helper;
+	}
+
+	local_irq_save(flags);
+	i = 0;
+	while (i < count) {
+		level = lirc_get_timer();
+		counttimer = 0;
+		lirc_on();
+		do {
+			newlevel = lirc_get_timer();
+			if (level == 0 && newlevel != 0)
+				counttimer++;
+			level = newlevel;
+			if (check_pselecd && (in(1) & LP_PSELECD)) {
+				lirc_off();
+				local_irq_restore(flags);
+				ret = -EIO;
+				goto out;
+			}
+		} while (counttimer < wbuf[i]);
+		i++;
+
+		lirc_off();
+		if (i == count)
+			break;
+		counttimer = 0;
+		do {
+			newlevel = lirc_get_timer();
+			if (level == 0 && newlevel != 0)
+				counttimer++;
+			level = newlevel;
+			if (check_pselecd && (in(1) & LP_PSELECD)) {
+				local_irq_restore(flags);
+				ret = -EIO;
+				goto out;
+			}
+		} while (counttimer < wbuf[i]);
+		i++;
+	}
+	local_irq_restore(flags);
+#else
+	/* place code that handles write without external timer here */
+#endif
+	ret = n;
+out:
+	kfree(wbuf);
+
+	return ret;
+}
+
+static unsigned int lirc_poll(struct file *file, poll_table *wait)
+{
+	poll_wait(file, &lirc_wait, wait);
+	if (rptr != wptr)
+		return POLLIN | POLLRDNORM;
+	return 0;
+}
+
+static long lirc_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
+{
+	int result;
+	u32 __user *uptr = (u32 __user *)arg;
+	u32 features = LIRC_CAN_SET_TRANSMITTER_MASK |
+		       LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2;
+	u32 mode;
+	u32 value;
+
+	switch (cmd) {
+	case LIRC_GET_FEATURES:
+		result = put_user(features, uptr);
+		if (result)
+			return result;
+		break;
+	case LIRC_GET_SEND_MODE:
+		result = put_user(LIRC_MODE_PULSE, uptr);
+		if (result)
+			return result;
+		break;
+	case LIRC_GET_REC_MODE:
+		result = put_user(LIRC_MODE_MODE2, uptr);
+		if (result)
+			return result;
+		break;
+	case LIRC_SET_SEND_MODE:
+		result = get_user(mode, uptr);
+		if (result)
+			return result;
+		if (mode != LIRC_MODE_PULSE)
+			return -EINVAL;
+		break;
+	case LIRC_SET_REC_MODE:
+		result = get_user(mode, uptr);
+		if (result)
+			return result;
+		if (mode != LIRC_MODE_MODE2)
+			return -ENOSYS;
+		break;
+	case LIRC_SET_TRANSMITTER_MASK:
+		result = get_user(value, uptr);
+		if (result)
+			return result;
+		if ((value & LIRC_PARALLEL_TRANSMITTER_MASK) != value)
+			return LIRC_PARALLEL_MAX_TRANSMITTERS;
+		tx_mask = value;
+		break;
+	default:
+		return -ENOIOCTLCMD;
+	}
+	return 0;
+}
+
+static int lirc_open(struct inode *node, struct file *filep)
+{
+	if (is_open || !lirc_claim())
+		return -EBUSY;
+
+	parport_enable_irq(pport);
+
+	/* init read ptr */
+	rptr = 0;
+	wptr = 0;
+	lost_irqs = 0;
+
+	is_open = 1;
+	return 0;
+}
+
+static int lirc_close(struct inode *node, struct file *filep)
+{
+	if (is_claimed) {
+		is_claimed = 0;
+		parport_release(ppdevice);
+	}
+	is_open = 0;
+	return 0;
+}
+
+static const struct file_operations lirc_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= lirc_lseek,
+	.read		= lirc_read,
+	.write		= lirc_write,
+	.poll		= lirc_poll,
+	.unlocked_ioctl	= lirc_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl	= lirc_ioctl,
+#endif
+	.open		= lirc_open,
+	.release	= lirc_close
+};
+
+static int set_use_inc(void *data)
+{
+	return 0;
+}
+
+static void set_use_dec(void *data)
+{
+}
+
+static struct lirc_driver driver = {
+	.name		= LIRC_DRIVER_NAME,
+	.minor		= -1,
+	.code_length	= 1,
+	.sample_rate	= 0,
+	.data		= NULL,
+	.add_to_buf	= NULL,
+	.set_use_inc	= set_use_inc,
+	.set_use_dec	= set_use_dec,
+	.fops		= &lirc_fops,
+	.dev		= NULL,
+	.owner		= THIS_MODULE,
+};
+
+static struct platform_device *lirc_parallel_dev;
+
+static int lirc_parallel_probe(struct platform_device *dev)
+{
+	return 0;
+}
+
+static int lirc_parallel_remove(struct platform_device *dev)
+{
+	return 0;
+}
+
+static int lirc_parallel_suspend(struct platform_device *dev,
+					pm_message_t state)
+{
+	return 0;
+}
+
+static int lirc_parallel_resume(struct platform_device *dev)
+{
+	return 0;
+}
+
+static struct platform_driver lirc_parallel_driver = {
+	.probe	= lirc_parallel_probe,
+	.remove	= lirc_parallel_remove,
+	.suspend	= lirc_parallel_suspend,
+	.resume	= lirc_parallel_resume,
+	.driver	= {
+		.name	= LIRC_DRIVER_NAME,
+	},
+};
+
+static int pf(void *handle)
+{
+	parport_disable_irq(pport);
+	is_claimed = 0;
+	return 0;
+}
+
+static void kf(void *handle)
+{
+	if (!is_open)
+		return;
+	if (!lirc_claim())
+		return;
+	parport_enable_irq(pport);
+	lirc_off();
+	/* this is a bit annoying when you actually print...*/
+	/*
+	printk(KERN_INFO "%s: reclaimed port\n", LIRC_DRIVER_NAME);
+	*/
+}
+
+/*** module initialization and cleanup ***/
+
+static int __init lirc_parallel_init(void)
+{
+	int result;
+
+	result = platform_driver_register(&lirc_parallel_driver);
+	if (result) {
+		pr_notice("platform_driver_register returned %d\n", result);
+		return result;
+	}
+
+	lirc_parallel_dev = platform_device_alloc(LIRC_DRIVER_NAME, 0);
+	if (!lirc_parallel_dev) {
+		result = -ENOMEM;
+		goto exit_driver_unregister;
+	}
+
+	result = platform_device_add(lirc_parallel_dev);
+	if (result)
+		goto exit_device_put;
+
+	pport = parport_find_base(io);
+	if (pport == NULL) {
+		pr_notice("no port at %x found\n", io);
+		result = -ENXIO;
+		goto exit_device_put;
+	}
+	ppdevice = parport_register_device(pport, LIRC_DRIVER_NAME,
+					   pf, kf, lirc_lirc_irq_handler, 0,
+					   NULL);
+	parport_put_port(pport);
+	if (ppdevice == NULL) {
+		pr_notice("parport_register_device() failed\n");
+		result = -ENXIO;
+		goto exit_device_put;
+	}
+	if (parport_claim(ppdevice) != 0)
+		goto skip_init;
+	is_claimed = 1;
+	out(LIRC_LP_CONTROL, LP_PSELECP|LP_PINITP);
+
+#ifdef LIRC_TIMER
+	if (debug)
+		out(LIRC_PORT_DATA, tx_mask);
+
+	timer = init_lirc_timer();
+
+#if 0	/* continue even if device is offline */
+	if (timer == 0) {
+		is_claimed = 0;
+		parport_release(pport);
+		parport_unregister_device(ppdevice);
+		result = -EIO;
+		goto exit_device_put;
+	}
+
+#endif
+	if (debug)
+		out(LIRC_PORT_DATA, 0);
+#endif
+
+	is_claimed = 0;
+	parport_release(ppdevice);
+ skip_init:
+	driver.dev = &lirc_parallel_dev->dev;
+	driver.minor = lirc_register_driver(&driver);
+	if (driver.minor < 0) {
+		pr_notice("register_chrdev() failed\n");
+		parport_unregister_device(ppdevice);
+		result = -EIO;
+		goto exit_device_put;
+	}
+	pr_info("installed using port 0x%04x irq %d\n", io, irq);
+	return 0;
+
+exit_device_put:
+	platform_device_put(lirc_parallel_dev);
+exit_driver_unregister:
+	platform_driver_unregister(&lirc_parallel_driver);
+	return result;
+}
+
+static void __exit lirc_parallel_exit(void)
+{
+	parport_unregister_device(ppdevice);
+	lirc_unregister_driver(driver.minor);
+
+	platform_device_unregister(lirc_parallel_dev);
+	platform_driver_unregister(&lirc_parallel_driver);
+}
+
+module_init(lirc_parallel_init);
+module_exit(lirc_parallel_exit);
+
+MODULE_DESCRIPTION("Infrared receiver driver for parallel ports.");
+MODULE_AUTHOR("Christoph Bartelmus");
+MODULE_LICENSE("GPL");
+
+module_param(io, int, S_IRUGO);
+MODULE_PARM_DESC(io, "I/O address base (0x3bc, 0x378 or 0x278)");
+
+module_param(irq, int, S_IRUGO);
+MODULE_PARM_DESC(irq, "Interrupt (7 or 5)");
+
+module_param(tx_mask, int, S_IRUGO);
+MODULE_PARM_DESC(tx_maxk, "Transmitter mask (default: 0x01)");
+
+module_param(debug, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Enable debugging messages");
+
+module_param(check_pselecd, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(check_pselecd, "Check for printer (default: 0)");
diff --git a/drivers/staging/media/lirc/lirc_parallel.h b/drivers/staging/media/lirc/lirc_parallel.h
new file mode 100644
index 000000000..4bed6afe0
--- /dev/null
+++ b/drivers/staging/media/lirc/lirc_parallel.h
@@ -0,0 +1,26 @@
+/* lirc_parallel.h */
+
+#ifndef _LIRC_PARALLEL_H
+#define _LIRC_PARALLEL_H
+
+#include <linux/lp.h>
+
+#define LIRC_PORT_LEN 3
+
+#define LIRC_LP_BASE    0
+#define LIRC_LP_STATUS  1
+#define LIRC_LP_CONTROL 2
+
+#define LIRC_PORT_DATA           LIRC_LP_BASE    /* base */
+#define LIRC_PORT_TIMER        LIRC_LP_STATUS    /* status port */
+#define LIRC_PORT_TIMER_BIT          LP_PBUSY    /* busy signal */
+#define LIRC_PORT_SIGNAL       LIRC_LP_STATUS    /* status port */
+#define LIRC_PORT_SIGNAL_BIT          LP_PACK    /* ack signal */
+#define LIRC_PORT_IRQ         LIRC_LP_CONTROL    /* control port */
+
+#define LIRC_SFH506_DELAY 0             /* delay t_phl in usecs */
+
+#define LIRC_PARALLEL_MAX_TRANSMITTERS 8
+#define LIRC_PARALLEL_TRANSMITTER_MASK ((1<<LIRC_PARALLEL_MAX_TRANSMITTERS) - 1)
+
+#endif
diff --git a/drivers/staging/media/lirc/lirc_sasem.c b/drivers/staging/media/lirc/lirc_sasem.c
new file mode 100644
index 000000000..9e5674341
--- /dev/null
+++ b/drivers/staging/media/lirc/lirc_sasem.c
@@ -0,0 +1,921 @@
+/*
+ * lirc_sasem.c - USB remote support for LIRC
+ * Version 0.5
+ *
+ * Copyright (C) 2004-2005 Oliver Stabel <oliver.stabel@gmx.de>
+ *			 Tim Davies <tim@opensystems.net.au>
+ *
+ * This driver was derived from:
+ *   Venky Raju <dev@venky.ws>
+ *      "lirc_imon - "LIRC/VFD driver for Ahanix/Soundgraph IMON IR/VFD"
+ *   Paul Miller <pmiller9@users.sourceforge.net>'s 2003-2004
+ *      "lirc_atiusb - USB remote support for LIRC"
+ *   Culver Consulting Services <henry@culcon.com>'s 2003
+ *      "Sasem OnAir VFD/IR USB driver"
+ *
+ *
+ * NOTE - The LCDproc iMon driver should work with this module.  More info at
+ *	http://www.frogstorm.info/sasem
+ */
+
+/*
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/usb.h>
+
+#include <media/lirc.h>
+#include <media/lirc_dev.h>
+
+
+#define MOD_AUTHOR	"Oliver Stabel <oliver.stabel@gmx.de>, " \
+			"Tim Davies <tim@opensystems.net.au>"
+#define MOD_DESC	"USB Driver for Sasem Remote Controller V1.1"
+#define MOD_NAME	"lirc_sasem"
+#define MOD_VERSION	"0.5"
+
+#define VFD_MINOR_BASE	144	/* Same as LCD */
+#define DEVICE_NAME	"lcd%d"
+
+#define BUF_CHUNK_SIZE	8
+#define BUF_SIZE	128
+
+#define IOCTL_LCD_CONTRAST 1
+
+/*** P R O T O T Y P E S ***/
+
+/* USB Callback prototypes */
+static int sasem_probe(struct usb_interface *interface,
+			const struct usb_device_id *id);
+static void sasem_disconnect(struct usb_interface *interface);
+static void usb_rx_callback(struct urb *urb);
+static void usb_tx_callback(struct urb *urb);
+
+/* VFD file_operations function prototypes */
+static int vfd_open(struct inode *inode, struct file *file);
+static long vfd_ioctl(struct file *file, unsigned cmd, unsigned long arg);
+static int vfd_close(struct inode *inode, struct file *file);
+static ssize_t vfd_write(struct file *file, const char __user *buf,
+				size_t n_bytes, loff_t *pos);
+
+/* LIRC driver function prototypes */
+static int ir_open(void *data);
+static void ir_close(void *data);
+
+/*** G L O B A L S ***/
+#define SASEM_DATA_BUF_SZ	32
+
+struct sasem_context {
+
+	struct usb_device *dev;
+	int vfd_isopen;			/* VFD port has been opened */
+	unsigned int vfd_contrast;	/* VFD contrast */
+	int ir_isopen;			/* IR port has been opened */
+	int dev_present;		/* USB device presence */
+	struct mutex ctx_lock;		/* to lock this object */
+	wait_queue_head_t remove_ok;	/* For unexpected USB disconnects */
+
+	struct lirc_driver *driver;
+	struct usb_endpoint_descriptor *rx_endpoint;
+	struct usb_endpoint_descriptor *tx_endpoint;
+	struct urb *rx_urb;
+	struct urb *tx_urb;
+	unsigned char usb_rx_buf[8];
+	unsigned char usb_tx_buf[8];
+
+	struct tx_t {
+		unsigned char data_buf[SASEM_DATA_BUF_SZ]; /* user data
+							    * buffer */
+		struct completion finished;  /* wait for write to finish  */
+		atomic_t busy;		     /* write in progress */
+		int status;		     /* status of tx completion */
+	} tx;
+
+	/* for dealing with repeat codes (wish there was a toggle bit!) */
+	struct timeval presstime;
+	char lastcode[8];
+	int codesaved;
+};
+
+/* VFD file operations */
+static const struct file_operations vfd_fops = {
+	.owner		= THIS_MODULE,
+	.open		= &vfd_open,
+	.write		= vfd_write,
+	.unlocked_ioctl	= &vfd_ioctl,
+	.release	= &vfd_close,
+	.llseek		= noop_llseek,
+};
+
+/* USB Device ID for Sasem USB Control Board */
+static struct usb_device_id sasem_usb_id_table[] = {
+	/* Sasem USB Control Board */
+	{ USB_DEVICE(0x11ba, 0x0101) },
+	/* Terminating entry */
+	{}
+};
+
+/* USB Device data */
+static struct usb_driver sasem_driver = {
+	.name		= MOD_NAME,
+	.probe		= sasem_probe,
+	.disconnect	= sasem_disconnect,
+	.id_table	= sasem_usb_id_table,
+};
+
+static struct usb_class_driver sasem_class = {
+	.name		= DEVICE_NAME,
+	.fops		= &vfd_fops,
+	.minor_base	= VFD_MINOR_BASE,
+};
+
+/* to prevent races between open() and disconnect() */
+static DEFINE_MUTEX(disconnect_lock);
+
+static int debug;
+
+
+/*** M O D U L E   C O D E ***/
+
+MODULE_AUTHOR(MOD_AUTHOR);
+MODULE_DESCRIPTION(MOD_DESC);
+MODULE_LICENSE("GPL");
+module_param(debug, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Debug messages: 0=no, 1=yes (default: no)");
+
+static void delete_context(struct sasem_context *context)
+{
+	usb_free_urb(context->tx_urb);  /* VFD */
+	usb_free_urb(context->rx_urb);  /* IR */
+	lirc_buffer_free(context->driver->rbuf);
+	kfree(context->driver->rbuf);
+	kfree(context->driver);
+	kfree(context);
+}
+
+static void deregister_from_lirc(struct sasem_context *context)
+{
+	int retval;
+	int minor = context->driver->minor;
+
+	retval = lirc_unregister_driver(minor);
+	if (retval)
+		dev_err(&context->dev->dev,
+			"%s: unable to deregister from lirc (%d)\n",
+		       __func__, retval);
+	else
+		dev_info(&context->dev->dev,
+		         "Deregistered Sasem driver (minor:%d)\n", minor);
+
+}
+
+/**
+ * Called when the VFD device (e.g. /dev/usb/lcd)
+ * is opened by the application.
+ */
+static int vfd_open(struct inode *inode, struct file *file)
+{
+	struct usb_interface *interface;
+	struct sasem_context *context = NULL;
+	int subminor;
+	int retval = 0;
+
+	/* prevent races with disconnect */
+	mutex_lock(&disconnect_lock);
+
+	subminor = iminor(inode);
+	interface = usb_find_interface(&sasem_driver, subminor);
+	if (!interface) {
+		pr_err("%s: could not find interface for minor %d\n",
+		       __func__, subminor);
+		retval = -ENODEV;
+		goto exit;
+	}
+	context = usb_get_intfdata(interface);
+
+	if (!context) {
+		dev_err(&interface->dev, "no context found for minor %d\n",
+			subminor);
+		retval = -ENODEV;
+		goto exit;
+	}
+
+	mutex_lock(&context->ctx_lock);
+
+	if (context->vfd_isopen) {
+		dev_err(&interface->dev,
+			"%s: VFD port is already open", __func__);
+		retval = -EBUSY;
+	} else {
+		context->vfd_isopen = 1;
+		file->private_data = context;
+		dev_info(&interface->dev, "VFD port opened\n");
+	}
+
+	mutex_unlock(&context->ctx_lock);
+
+exit:
+	mutex_unlock(&disconnect_lock);
+	return retval;
+}
+
+/**
+ * Called when the VFD device (e.g. /dev/usb/lcd)
+ * is closed by the application.
+ */
+static long vfd_ioctl(struct file *file, unsigned cmd, unsigned long arg)
+{
+	struct sasem_context *context = NULL;
+
+	context = (struct sasem_context *) file->private_data;
+
+	if (!context) {
+		pr_err("%s: no context for device\n", __func__);
+		return -ENODEV;
+	}
+
+	mutex_lock(&context->ctx_lock);
+
+	switch (cmd) {
+	case IOCTL_LCD_CONTRAST:
+		if (arg > 1000)
+			arg = 1000;
+		context->vfd_contrast = (unsigned int)arg;
+		break;
+	default:
+		pr_info("Unknown IOCTL command\n");
+		mutex_unlock(&context->ctx_lock);
+		return -ENOIOCTLCMD;  /* not supported */
+	}
+
+	mutex_unlock(&context->ctx_lock);
+	return 0;
+}
+
+/**
+ * Called when the VFD device (e.g. /dev/usb/lcd)
+ * is closed by the application.
+ */
+static int vfd_close(struct inode *inode, struct file *file)
+{
+	struct sasem_context *context = NULL;
+	int retval = 0;
+
+	context = (struct sasem_context *) file->private_data;
+
+	if (!context) {
+		pr_err("%s: no context for device\n", __func__);
+		return -ENODEV;
+	}
+
+	mutex_lock(&context->ctx_lock);
+
+	if (!context->vfd_isopen) {
+		dev_err(&context->dev->dev, "%s: VFD is not open\n", __func__);
+		retval = -EIO;
+	} else {
+		context->vfd_isopen = 0;
+		dev_info(&context->dev->dev, "VFD port closed\n");
+		if (!context->dev_present && !context->ir_isopen) {
+
+			/* Device disconnected before close and IR port is
+			 * not open. If IR port is open, context will be
+			 * deleted by ir_close. */
+			mutex_unlock(&context->ctx_lock);
+			delete_context(context);
+			return retval;
+		}
+	}
+
+	mutex_unlock(&context->ctx_lock);
+	return retval;
+}
+
+/**
+ * Sends a packet to the VFD.
+ */
+static int send_packet(struct sasem_context *context)
+{
+	unsigned int pipe;
+	int interval = 0;
+	int retval = 0;
+
+	pipe = usb_sndintpipe(context->dev,
+			context->tx_endpoint->bEndpointAddress);
+	interval = context->tx_endpoint->bInterval;
+
+	usb_fill_int_urb(context->tx_urb, context->dev, pipe,
+		context->usb_tx_buf, sizeof(context->usb_tx_buf),
+		usb_tx_callback, context, interval);
+
+	context->tx_urb->actual_length = 0;
+
+	init_completion(&context->tx.finished);
+	atomic_set(&context->tx.busy, 1);
+
+	retval =  usb_submit_urb(context->tx_urb, GFP_KERNEL);
+	if (retval) {
+		atomic_set(&context->tx.busy, 0);
+		dev_err(&context->dev->dev, "error submitting urb (%d)\n",
+			retval);
+	} else {
+		/* Wait for transmission to complete (or abort) */
+		mutex_unlock(&context->ctx_lock);
+		wait_for_completion(&context->tx.finished);
+		mutex_lock(&context->ctx_lock);
+
+		retval = context->tx.status;
+		if (retval)
+			dev_err(&context->dev->dev,
+				"packet tx failed (%d)\n", retval);
+	}
+
+	return retval;
+}
+
+/**
+ * Writes data to the VFD.  The Sasem VFD is 2x16 characters
+ * and requires data in 9 consecutive USB interrupt packets,
+ * each packet carrying 8 bytes.
+ */
+static ssize_t vfd_write(struct file *file, const char __user *buf,
+				size_t n_bytes, loff_t *pos)
+{
+	int i;
+	int retval = 0;
+	struct sasem_context *context;
+	int *data_buf = NULL;
+
+	context = (struct sasem_context *) file->private_data;
+	if (!context) {
+		pr_err("%s: no context for device\n", __func__);
+		return -ENODEV;
+	}
+
+	mutex_lock(&context->ctx_lock);
+
+	if (!context->dev_present) {
+		pr_err("%s: no Sasem device present\n", __func__);
+		retval = -ENODEV;
+		goto exit;
+	}
+
+	if (n_bytes <= 0 || n_bytes > SASEM_DATA_BUF_SZ) {
+		dev_err(&context->dev->dev, "%s: invalid payload size\n",
+			__func__);
+		retval = -EINVAL;
+		goto exit;
+	}
+
+	data_buf = memdup_user(buf, n_bytes);
+	if (IS_ERR(data_buf)) {
+		retval = PTR_ERR(data_buf);
+		data_buf = NULL;
+		goto exit;
+	}
+
+	memcpy(context->tx.data_buf, data_buf, n_bytes);
+
+	/* Pad with spaces */
+	for (i = n_bytes; i < SASEM_DATA_BUF_SZ; ++i)
+		context->tx.data_buf[i] = ' ';
+
+	/* Nine 8 byte packets to be sent */
+	/* NOTE: "\x07\x01\0\0\0\0\0\0" or "\x0c\0\0\0\0\0\0\0"
+	 *       will clear the VFD */
+	for (i = 0; i < 9; i++) {
+		switch (i) {
+		case 0:
+			memcpy(context->usb_tx_buf, "\x07\0\0\0\0\0\0\0", 8);
+			context->usb_tx_buf[1] = (context->vfd_contrast) ?
+				(0x2B - (context->vfd_contrast - 1) / 250)
+				: 0x2B;
+			break;
+		case 1:
+			memcpy(context->usb_tx_buf, "\x09\x01\0\0\0\0\0\0", 8);
+			break;
+		case 2:
+			memcpy(context->usb_tx_buf, "\x0b\x01\0\0\0\0\0\0", 8);
+			break;
+		case 3:
+			memcpy(context->usb_tx_buf, context->tx.data_buf, 8);
+			break;
+		case 4:
+			memcpy(context->usb_tx_buf,
+			       context->tx.data_buf + 8, 8);
+			break;
+		case 5:
+			memcpy(context->usb_tx_buf, "\x09\x01\0\0\0\0\0\0", 8);
+			break;
+		case 6:
+			memcpy(context->usb_tx_buf, "\x0b\x02\0\0\0\0\0\0", 8);
+			break;
+		case 7:
+			memcpy(context->usb_tx_buf,
+			       context->tx.data_buf + 16, 8);
+			break;
+		case 8:
+			memcpy(context->usb_tx_buf,
+			       context->tx.data_buf + 24, 8);
+			break;
+		}
+		retval = send_packet(context);
+		if (retval) {
+			dev_err(&context->dev->dev,
+				"send packet failed for packet #%d\n", i);
+			goto exit;
+		}
+	}
+exit:
+
+	mutex_unlock(&context->ctx_lock);
+	kfree(data_buf);
+
+	return (!retval) ? n_bytes : retval;
+}
+
+/**
+ * Callback function for USB core API: transmit data
+ */
+static void usb_tx_callback(struct urb *urb)
+{
+	struct sasem_context *context;
+
+	if (!urb)
+		return;
+	context = (struct sasem_context *) urb->context;
+	if (!context)
+		return;
+
+	context->tx.status = urb->status;
+
+	/* notify waiters that write has finished */
+	atomic_set(&context->tx.busy, 0);
+	complete(&context->tx.finished);
+}
+
+/**
+ * Called by lirc_dev when the application opens /dev/lirc
+ */
+static int ir_open(void *data)
+{
+	int retval = 0;
+	struct sasem_context *context;
+
+	/* prevent races with disconnect */
+	mutex_lock(&disconnect_lock);
+
+	context = data;
+
+	mutex_lock(&context->ctx_lock);
+
+	if (context->ir_isopen) {
+		dev_err(&context->dev->dev, "%s: IR port is already open\n",
+			__func__);
+		retval = -EBUSY;
+		goto exit;
+	}
+
+	usb_fill_int_urb(context->rx_urb, context->dev,
+		usb_rcvintpipe(context->dev,
+				context->rx_endpoint->bEndpointAddress),
+		context->usb_rx_buf, sizeof(context->usb_rx_buf),
+		usb_rx_callback, context, context->rx_endpoint->bInterval);
+
+	retval = usb_submit_urb(context->rx_urb, GFP_KERNEL);
+
+	if (retval)
+		dev_err(&context->dev->dev,
+			"usb_submit_urb failed for ir_open (%d)\n", retval);
+	else {
+		context->ir_isopen = 1;
+		dev_info(&context->dev->dev, "IR port opened\n");
+	}
+
+exit:
+	mutex_unlock(&context->ctx_lock);
+
+	mutex_unlock(&disconnect_lock);
+	return retval;
+}
+
+/**
+ * Called by lirc_dev when the application closes /dev/lirc
+ */
+static void ir_close(void *data)
+{
+	struct sasem_context *context;
+
+	context = data;
+	if (!context) {
+		pr_err("%s: no context for device\n", __func__);
+		return;
+	}
+
+	mutex_lock(&context->ctx_lock);
+
+	usb_kill_urb(context->rx_urb);
+	context->ir_isopen = 0;
+	pr_info("IR port closed\n");
+
+	if (!context->dev_present) {
+
+		/*
+		 * Device disconnected while IR port was
+		 * still open. Driver was not deregistered
+		 * at disconnect time, so do it now.
+		 */
+		deregister_from_lirc(context);
+
+		if (!context->vfd_isopen) {
+
+			mutex_unlock(&context->ctx_lock);
+			delete_context(context);
+			return;
+		}
+		/* If VFD port is open, context will be deleted by vfd_close */
+	}
+
+	mutex_unlock(&context->ctx_lock);
+}
+
+/**
+ * Process the incoming packet
+ */
+static void incoming_packet(struct sasem_context *context,
+				   struct urb *urb)
+{
+	int len = urb->actual_length;
+	unsigned char *buf = urb->transfer_buffer;
+	long ms;
+	struct timeval tv;
+
+	if (len != 8) {
+		dev_warn(&context->dev->dev,
+			 "%s: invalid incoming packet size (%d)\n",
+			 __func__, len);
+		return;
+	}
+
+	if (debug)
+		dev_info(&context->dev->dev, "Incoming data: %*ph\n", len, buf);
+	/*
+	 * Lirc could deal with the repeat code, but we really need to block it
+	 * if it arrives too late.  Otherwise we could repeat the wrong code.
+	 */
+
+	/* get the time since the last button press */
+	do_gettimeofday(&tv);
+	ms = (tv.tv_sec - context->presstime.tv_sec) * 1000 +
+	     (tv.tv_usec - context->presstime.tv_usec) / 1000;
+
+	if (memcmp(buf, "\x08\0\0\0\0\0\0\0", 8) == 0) {
+		/*
+		 * the repeat code is being sent, so we copy
+		 * the old code to LIRC
+		 */
+
+		/*
+		 * NOTE: Only if the last code was less than 250ms ago
+		 * - no one should be able to push another (undetected) button
+		 *   in that time and then get a false repeat of the previous
+		 *   press but it is long enough for a genuine repeat
+		 */
+		if ((ms < 250) && (context->codesaved != 0)) {
+			memcpy(buf, &context->lastcode, 8);
+			context->presstime.tv_sec = tv.tv_sec;
+			context->presstime.tv_usec = tv.tv_usec;
+		}
+	} else {
+		/* save the current valid code for repeats */
+		memcpy(&context->lastcode, buf, 8);
+		/*
+		 * set flag to signal a valid code was save;
+		 * just for safety reasons
+		 */
+		context->codesaved = 1;
+		context->presstime.tv_sec = tv.tv_sec;
+		context->presstime.tv_usec = tv.tv_usec;
+	}
+
+	lirc_buffer_write(context->driver->rbuf, buf);
+	wake_up(&context->driver->rbuf->wait_poll);
+}
+
+/**
+ * Callback function for USB core API: receive data
+ */
+static void usb_rx_callback(struct urb *urb)
+{
+	struct sasem_context *context;
+
+	if (!urb)
+		return;
+	context = (struct sasem_context *) urb->context;
+	if (!context)
+		return;
+
+	switch (urb->status) {
+
+	case -ENOENT:		/* usbcore unlink successful! */
+		return;
+
+	case 0:
+		if (context->ir_isopen)
+			incoming_packet(context, urb);
+		break;
+
+	default:
+		dev_warn(&urb->dev->dev, "%s: status (%d): ignored",
+			 __func__, urb->status);
+		break;
+	}
+
+	usb_submit_urb(context->rx_urb, GFP_ATOMIC);
+}
+
+
+
+/**
+ * Callback function for USB core API: Probe
+ */
+static int sasem_probe(struct usb_interface *interface,
+			const struct usb_device_id *id)
+{
+	struct usb_device *dev = NULL;
+	struct usb_host_interface *iface_desc = NULL;
+	struct usb_endpoint_descriptor *rx_endpoint = NULL;
+	struct usb_endpoint_descriptor *tx_endpoint = NULL;
+	struct urb *rx_urb = NULL;
+	struct urb *tx_urb = NULL;
+	struct lirc_driver *driver = NULL;
+	struct lirc_buffer *rbuf = NULL;
+	int lirc_minor = 0;
+	int num_endpoints;
+	int retval = 0;
+	int vfd_ep_found;
+	int ir_ep_found;
+	int alloc_status;
+	struct sasem_context *context = NULL;
+	int i;
+
+	dev_info(&interface->dev, "%s: found Sasem device\n", __func__);
+
+
+	dev = usb_get_dev(interface_to_usbdev(interface));
+	iface_desc = interface->cur_altsetting;
+	num_endpoints = iface_desc->desc.bNumEndpoints;
+
+	/*
+	 * Scan the endpoint list and set:
+	 *	first input endpoint = IR endpoint
+	 *	first output endpoint = VFD endpoint
+	 */
+
+	ir_ep_found = 0;
+	vfd_ep_found = 0;
+
+	for (i = 0; i < num_endpoints && !(ir_ep_found && vfd_ep_found); ++i) {
+
+		struct usb_endpoint_descriptor *ep;
+		int ep_dir;
+		int ep_type;
+
+		ep = &iface_desc->endpoint [i].desc;
+		ep_dir = ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK;
+		ep_type = ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
+
+		if (!ir_ep_found &&
+			ep_dir == USB_DIR_IN &&
+			ep_type == USB_ENDPOINT_XFER_INT) {
+
+			rx_endpoint = ep;
+			ir_ep_found = 1;
+			if (debug)
+				dev_info(&interface->dev,
+					"%s: found IR endpoint\n", __func__);
+
+		} else if (!vfd_ep_found &&
+			ep_dir == USB_DIR_OUT &&
+			ep_type == USB_ENDPOINT_XFER_INT) {
+
+			tx_endpoint = ep;
+			vfd_ep_found = 1;
+			if (debug)
+				dev_info(&interface->dev,
+					"%s: found VFD endpoint\n", __func__);
+		}
+	}
+
+	/* Input endpoint is mandatory */
+	if (!ir_ep_found) {
+		dev_err(&interface->dev,
+			"%s: no valid input (IR) endpoint found.\n", __func__);
+		retval = -ENODEV;
+		goto exit;
+	}
+
+	if (!vfd_ep_found)
+		dev_info(&interface->dev,
+			"%s: no valid output (VFD) endpoint found.\n",
+			__func__);
+
+
+	/* Allocate memory */
+	alloc_status = 0;
+
+	context = kzalloc(sizeof(struct sasem_context), GFP_KERNEL);
+	if (!context) {
+		alloc_status = 1;
+		goto alloc_status_switch;
+	}
+	driver = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
+	if (!driver) {
+		alloc_status = 2;
+		goto alloc_status_switch;
+	}
+	rbuf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
+	if (!rbuf) {
+		alloc_status = 3;
+		goto alloc_status_switch;
+	}
+	if (lirc_buffer_init(rbuf, BUF_CHUNK_SIZE, BUF_SIZE)) {
+		dev_err(&interface->dev,
+			"%s: lirc_buffer_init failed\n", __func__);
+		alloc_status = 4;
+		goto alloc_status_switch;
+	}
+	rx_urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!rx_urb) {
+		dev_err(&interface->dev,
+			"%s: usb_alloc_urb failed for IR urb\n", __func__);
+		alloc_status = 5;
+		goto alloc_status_switch;
+	}
+	if (vfd_ep_found) {
+		tx_urb = usb_alloc_urb(0, GFP_KERNEL);
+		if (!tx_urb) {
+			dev_err(&interface->dev,
+				"%s: usb_alloc_urb failed for VFD urb",
+				__func__);
+			alloc_status = 6;
+			goto alloc_status_switch;
+		}
+	}
+
+	mutex_init(&context->ctx_lock);
+
+	strcpy(driver->name, MOD_NAME);
+	driver->minor = -1;
+	driver->code_length = 64;
+	driver->sample_rate = 0;
+	driver->features = LIRC_CAN_REC_LIRCCODE;
+	driver->data = context;
+	driver->rbuf = rbuf;
+	driver->set_use_inc = ir_open;
+	driver->set_use_dec = ir_close;
+	driver->dev   = &interface->dev;
+	driver->owner = THIS_MODULE;
+
+	mutex_lock(&context->ctx_lock);
+
+	lirc_minor = lirc_register_driver(driver);
+	if (lirc_minor < 0) {
+		dev_err(&interface->dev,
+			"%s: lirc_register_driver failed\n", __func__);
+		alloc_status = 7;
+		retval = lirc_minor;
+		goto unlock;
+	} else
+		dev_info(&interface->dev,
+			 "%s: Registered Sasem driver (minor:%d)\n",
+			 __func__, lirc_minor);
+
+	/* Needed while unregistering! */
+	driver->minor = lirc_minor;
+
+	context->dev = dev;
+	context->dev_present = 1;
+	context->rx_endpoint = rx_endpoint;
+	context->rx_urb = rx_urb;
+	if (vfd_ep_found) {
+		context->tx_endpoint = tx_endpoint;
+		context->tx_urb = tx_urb;
+		context->vfd_contrast = 1000;   /* range 0 - 1000 */
+	}
+	context->driver = driver;
+
+	usb_set_intfdata(interface, context);
+
+	if (vfd_ep_found) {
+
+		if (debug)
+			dev_info(&interface->dev,
+				 "Registering VFD with sysfs\n");
+		if (usb_register_dev(interface, &sasem_class))
+			/* Not a fatal error, so ignore */
+			dev_info(&interface->dev,
+				 "%s: could not get a minor number for VFD\n",
+				 __func__);
+	}
+
+	dev_info(&interface->dev,
+		 "%s: Sasem device on usb<%d:%d> initialized\n",
+		 __func__, dev->bus->busnum, dev->devnum);
+unlock:
+	mutex_unlock(&context->ctx_lock);
+
+alloc_status_switch:
+	switch (alloc_status) {
+
+	case 7:
+		if (vfd_ep_found)
+			usb_free_urb(tx_urb);
+	case 6:
+		usb_free_urb(rx_urb);
+		/* fall-through */
+	case 5:
+		lirc_buffer_free(rbuf);
+		/* fall-through */
+	case 4:
+		kfree(rbuf);
+		/* fall-through */
+	case 3:
+		kfree(driver);
+		/* fall-through */
+	case 2:
+		kfree(context);
+		context = NULL;
+		/* fall-through */
+	case 1:
+		if (retval == 0)
+			retval = -ENOMEM;
+	}
+
+exit:
+	return retval;
+}
+
+/**
+ * Callback function for USB core API: disconnect
+ */
+static void sasem_disconnect(struct usb_interface *interface)
+{
+	struct sasem_context *context;
+
+	/* prevent races with ir_open()/vfd_open() */
+	mutex_lock(&disconnect_lock);
+
+	context = usb_get_intfdata(interface);
+	mutex_lock(&context->ctx_lock);
+
+	dev_info(&interface->dev, "%s: Sasem device disconnected\n",
+		 __func__);
+
+	usb_set_intfdata(interface, NULL);
+	context->dev_present = 0;
+
+	/* Stop reception */
+	usb_kill_urb(context->rx_urb);
+
+	/* Abort ongoing write */
+	if (atomic_read(&context->tx.busy)) {
+
+		usb_kill_urb(context->tx_urb);
+		wait_for_completion(&context->tx.finished);
+	}
+
+	/* De-register from lirc_dev if IR port is not open */
+	if (!context->ir_isopen)
+		deregister_from_lirc(context);
+
+	usb_deregister_dev(interface, &sasem_class);
+
+	mutex_unlock(&context->ctx_lock);
+
+	if (!context->ir_isopen && !context->vfd_isopen)
+		delete_context(context);
+
+	mutex_unlock(&disconnect_lock);
+}
+
+module_usb_driver(sasem_driver);
diff --git a/drivers/staging/media/lirc/lirc_serial.c b/drivers/staging/media/lirc/lirc_serial.c
new file mode 100644
index 000000000..dc7984455
--- /dev/null
+++ b/drivers/staging/media/lirc/lirc_serial.c
@@ -0,0 +1,1213 @@
+/*
+ * lirc_serial.c
+ *
+ * lirc_serial - Device driver that records pulse- and pause-lengths
+ *	       (space-lengths) between DDCD event on a serial port.
+ *
+ * Copyright (C) 1996,97 Ralph Metzler <rjkm@thp.uni-koeln.de>
+ * Copyright (C) 1998 Trent Piepho <xyzzy@u.washington.edu>
+ * Copyright (C) 1998 Ben Pfaff <blp@gnu.org>
+ * Copyright (C) 1999 Christoph Bartelmus <lirc@bartelmus.de>
+ * Copyright (C) 2007 Andrei Tanas <andrei@tanas.ca> (suspend/resume support)
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+/*
+ * Steve's changes to improve transmission fidelity:
+ *   - for systems with the rdtsc instruction and the clock counter, a
+ *     send_pule that times the pulses directly using the counter.
+ *     This means that the LIRC_SERIAL_TRANSMITTER_LATENCY fudge is
+ *     not needed. Measurement shows very stable waveform, even where
+ *     PCI activity slows the access to the UART, which trips up other
+ *     versions.
+ *   - For other system, non-integer-microsecond pulse/space lengths,
+ *     done using fixed point binary. So, much more accurate carrier
+ *     frequency.
+ *   - fine tuned transmitter latency, taking advantage of fractional
+ *     microseconds in previous change
+ *   - Fixed bug in the way transmitter latency was accounted for by
+ *     tuning the pulse lengths down - the send_pulse routine ignored
+ *     this overhead as it timed the overall pulse length - so the
+ *     pulse frequency was right but overall pulse length was too
+ *     long. Fixed by accounting for latency on each pulse/space
+ *     iteration.
+ *
+ * Steve Davies <steve@daviesfam.org>  July 2001
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/serial_reg.h>
+#include <linux/time.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/wait.h>
+#include <linux/mm.h>
+#include <linux/delay.h>
+#include <linux/poll.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/fcntl.h>
+#include <linux/spinlock.h>
+
+/* From Intel IXP42X Developer's Manual (#252480-005): */
+/* ftp://download.intel.com/design/network/manuals/25248005.pdf */
+#define UART_IE_IXP42X_UUE   0x40 /* IXP42X UART Unit enable */
+#define UART_IE_IXP42X_RTOIE 0x10 /* IXP42X Receiver Data Timeout int.enable */
+
+#include <media/lirc.h>
+#include <media/lirc_dev.h>
+
+#define LIRC_DRIVER_NAME "lirc_serial"
+
+struct lirc_serial {
+	int signal_pin;
+	int signal_pin_change;
+	u8 on;
+	u8 off;
+	long (*send_pulse)(unsigned long length);
+	void (*send_space)(long length);
+	int features;
+	spinlock_t lock;
+};
+
+#define LIRC_HOMEBREW		0
+#define LIRC_IRDEO		1
+#define LIRC_IRDEO_REMOTE	2
+#define LIRC_ANIMAX		3
+#define LIRC_IGOR		4
+#define LIRC_NSLU2		5
+
+/*** module parameters ***/
+static int type;
+static int io;
+static int irq;
+static bool iommap;
+static int ioshift;
+static bool softcarrier = true;
+static bool share_irq;
+static bool debug;
+static int sense = -1;	/* -1 = auto, 0 = active high, 1 = active low */
+static bool txsense;	/* 0 = active high, 1 = active low */
+
+#define dprintk(fmt, args...)					\
+	do {							\
+		if (debug)					\
+			printk(KERN_DEBUG LIRC_DRIVER_NAME ": "	\
+			       fmt, ## args);			\
+	} while (0)
+
+/* forward declarations */
+static long send_pulse_irdeo(unsigned long length);
+static long send_pulse_homebrew(unsigned long length);
+static void send_space_irdeo(long length);
+static void send_space_homebrew(long length);
+
+static struct lirc_serial hardware[] = {
+	[LIRC_HOMEBREW] = {
+		.lock = __SPIN_LOCK_UNLOCKED(hardware[LIRC_HOMEBREW].lock),
+		.signal_pin        = UART_MSR_DCD,
+		.signal_pin_change = UART_MSR_DDCD,
+		.on  = (UART_MCR_RTS | UART_MCR_OUT2 | UART_MCR_DTR),
+		.off = (UART_MCR_RTS | UART_MCR_OUT2),
+		.send_pulse = send_pulse_homebrew,
+		.send_space = send_space_homebrew,
+#ifdef CONFIG_LIRC_SERIAL_TRANSMITTER
+		.features    = (LIRC_CAN_SET_SEND_DUTY_CYCLE |
+				LIRC_CAN_SET_SEND_CARRIER |
+				LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2)
+#else
+		.features    = LIRC_CAN_REC_MODE2
+#endif
+	},
+
+	[LIRC_IRDEO] = {
+		.lock = __SPIN_LOCK_UNLOCKED(hardware[LIRC_IRDEO].lock),
+		.signal_pin        = UART_MSR_DSR,
+		.signal_pin_change = UART_MSR_DDSR,
+		.on  = UART_MCR_OUT2,
+		.off = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2),
+		.send_pulse  = send_pulse_irdeo,
+		.send_space  = send_space_irdeo,
+		.features    = (LIRC_CAN_SET_SEND_DUTY_CYCLE |
+				LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2)
+	},
+
+	[LIRC_IRDEO_REMOTE] = {
+		.lock = __SPIN_LOCK_UNLOCKED(hardware[LIRC_IRDEO_REMOTE].lock),
+		.signal_pin        = UART_MSR_DSR,
+		.signal_pin_change = UART_MSR_DDSR,
+		.on  = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2),
+		.off = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2),
+		.send_pulse  = send_pulse_irdeo,
+		.send_space  = send_space_irdeo,
+		.features    = (LIRC_CAN_SET_SEND_DUTY_CYCLE |
+				LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2)
+	},
+
+	[LIRC_ANIMAX] = {
+		.lock = __SPIN_LOCK_UNLOCKED(hardware[LIRC_ANIMAX].lock),
+		.signal_pin        = UART_MSR_DCD,
+		.signal_pin_change = UART_MSR_DDCD,
+		.on  = 0,
+		.off = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2),
+		.send_pulse = NULL,
+		.send_space = NULL,
+		.features   = LIRC_CAN_REC_MODE2
+	},
+
+	[LIRC_IGOR] = {
+		.lock = __SPIN_LOCK_UNLOCKED(hardware[LIRC_IGOR].lock),
+		.signal_pin        = UART_MSR_DSR,
+		.signal_pin_change = UART_MSR_DDSR,
+		.on  = (UART_MCR_RTS | UART_MCR_OUT2 | UART_MCR_DTR),
+		.off = (UART_MCR_RTS | UART_MCR_OUT2),
+		.send_pulse = send_pulse_homebrew,
+		.send_space = send_space_homebrew,
+#ifdef CONFIG_LIRC_SERIAL_TRANSMITTER
+		.features    = (LIRC_CAN_SET_SEND_DUTY_CYCLE |
+				LIRC_CAN_SET_SEND_CARRIER |
+				LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2)
+#else
+		.features    = LIRC_CAN_REC_MODE2
+#endif
+	},
+};
+
+#define RS_ISR_PASS_LIMIT 256
+
+/*
+ * A long pulse code from a remote might take up to 300 bytes.  The
+ * daemon should read the bytes as soon as they are generated, so take
+ * the number of keys you think you can push before the daemon runs
+ * and multiply by 300.  The driver will warn you if you overrun this
+ * buffer.  If you have a slow computer or non-busmastering IDE disks,
+ * maybe you will need to increase this.
+ */
+
+/* This MUST be a power of two!  It has to be larger than 1 as well. */
+
+#define RBUF_LEN 256
+
+static struct timeval lasttv = {0, 0};
+
+static struct lirc_buffer rbuf;
+
+static unsigned int freq = 38000;
+static unsigned int duty_cycle = 50;
+
+/* Initialized in init_timing_params() */
+static unsigned long period;
+static unsigned long pulse_width;
+static unsigned long space_width;
+
+#if defined(__i386__)
+/*
+ * From:
+ * Linux I/O port programming mini-HOWTO
+ * Author: Riku Saikkonen <Riku.Saikkonen@hut.fi>
+ * v, 28 December 1997
+ *
+ * [...]
+ * Actually, a port I/O instruction on most ports in the 0-0x3ff range
+ * takes almost exactly 1 microsecond, so if you're, for example, using
+ * the parallel port directly, just do additional inb()s from that port
+ * to delay.
+ * [...]
+ */
+/* transmitter latency 1.5625us 0x1.90 - this figure arrived at from
+ * comment above plus trimming to match actual measured frequency.
+ * This will be sensitive to cpu speed, though hopefully most of the 1.5us
+ * is spent in the uart access.  Still - for reference test machine was a
+ * 1.13GHz Athlon system - Steve
+ */
+
+/*
+ * changed from 400 to 450 as this works better on slower machines;
+ * faster machines will use the rdtsc code anyway
+ */
+#define LIRC_SERIAL_TRANSMITTER_LATENCY 450
+
+#else
+
+/* does anybody have information on other platforms ? */
+/* 256 = 1<<8 */
+#define LIRC_SERIAL_TRANSMITTER_LATENCY 256
+
+#endif  /* __i386__ */
+/*
+ * FIXME: should we be using hrtimers instead of this
+ * LIRC_SERIAL_TRANSMITTER_LATENCY nonsense?
+ */
+
+/* fetch serial input packet (1 byte) from register offset */
+static u8 sinp(int offset)
+{
+	if (iommap)
+		/* the register is memory-mapped */
+		offset <<= ioshift;
+
+	return inb(io + offset);
+}
+
+/* write serial output packet (1 byte) of value to register offset */
+static void soutp(int offset, u8 value)
+{
+	if (iommap)
+		/* the register is memory-mapped */
+		offset <<= ioshift;
+
+	outb(value, io + offset);
+}
+
+static void on(void)
+{
+	if (txsense)
+		soutp(UART_MCR, hardware[type].off);
+	else
+		soutp(UART_MCR, hardware[type].on);
+}
+
+static void off(void)
+{
+	if (txsense)
+		soutp(UART_MCR, hardware[type].on);
+	else
+		soutp(UART_MCR, hardware[type].off);
+}
+
+#ifndef MAX_UDELAY_MS
+#define MAX_UDELAY_US 5000
+#else
+#define MAX_UDELAY_US (MAX_UDELAY_MS*1000)
+#endif
+
+static void safe_udelay(unsigned long usecs)
+{
+	while (usecs > MAX_UDELAY_US) {
+		udelay(MAX_UDELAY_US);
+		usecs -= MAX_UDELAY_US;
+	}
+	udelay(usecs);
+}
+
+#ifdef USE_RDTSC
+/*
+ * This is an overflow/precision juggle, complicated in that we can't
+ * do long long divide in the kernel
+ */
+
+/*
+ * When we use the rdtsc instruction to measure clocks, we keep the
+ * pulse and space widths as clock cycles.  As this is CPU speed
+ * dependent, the widths must be calculated in init_port and ioctl
+ * time
+ */
+
+/* So send_pulse can quickly convert microseconds to clocks */
+static unsigned long conv_us_to_clocks;
+
+static int init_timing_params(unsigned int new_duty_cycle,
+		unsigned int new_freq)
+{
+	__u64 loops_per_sec, work;
+
+	duty_cycle = new_duty_cycle;
+	freq = new_freq;
+
+	loops_per_sec = __this_cpu_read(cpu.info.loops_per_jiffy);
+	loops_per_sec *= HZ;
+
+	/* How many clocks in a microsecond?, avoiding long long divide */
+	work = loops_per_sec;
+	work *= 4295;  /* 4295 = 2^32 / 1e6 */
+	conv_us_to_clocks = work >> 32;
+
+	/*
+	 * Carrier period in clocks, approach good up to 32GHz clock,
+	 * gets carrier frequency within 8Hz
+	 */
+	period = loops_per_sec >> 3;
+	period /= (freq >> 3);
+
+	/* Derive pulse and space from the period */
+	pulse_width = period * duty_cycle / 100;
+	space_width = period - pulse_width;
+	dprintk("in init_timing_params, freq=%d, duty_cycle=%d, "
+		"clk/jiffy=%ld, pulse=%ld, space=%ld, "
+		"conv_us_to_clocks=%ld\n",
+		freq, duty_cycle, __this_cpu_read(cpu_info.loops_per_jiffy),
+		pulse_width, space_width, conv_us_to_clocks);
+	return 0;
+}
+#else /* ! USE_RDTSC */
+static int init_timing_params(unsigned int new_duty_cycle,
+		unsigned int new_freq)
+{
+/*
+ * period, pulse/space width are kept with 8 binary places -
+ * IE multiplied by 256.
+ */
+	if (256 * 1000000L / new_freq * new_duty_cycle / 100 <=
+	    LIRC_SERIAL_TRANSMITTER_LATENCY)
+		return -EINVAL;
+	if (256 * 1000000L / new_freq * (100 - new_duty_cycle) / 100 <=
+	    LIRC_SERIAL_TRANSMITTER_LATENCY)
+		return -EINVAL;
+	duty_cycle = new_duty_cycle;
+	freq = new_freq;
+	period = 256 * 1000000L / freq;
+	pulse_width = period * duty_cycle / 100;
+	space_width = period - pulse_width;
+	dprintk("in init_timing_params, freq=%d pulse=%ld, space=%ld\n",
+		freq, pulse_width, space_width);
+	return 0;
+}
+#endif /* USE_RDTSC */
+
+
+/* return value: space length delta */
+
+static long send_pulse_irdeo(unsigned long length)
+{
+	long rawbits, ret;
+	int i;
+	unsigned char output;
+	unsigned char chunk, shifted;
+
+	/* how many bits have to be sent ? */
+	rawbits = length * 1152 / 10000;
+	if (duty_cycle > 50)
+		chunk = 3;
+	else
+		chunk = 1;
+	for (i = 0, output = 0x7f; rawbits > 0; rawbits -= 3) {
+		shifted = chunk << (i * 3);
+		shifted >>= 1;
+		output &= (~shifted);
+		i++;
+		if (i == 3) {
+			soutp(UART_TX, output);
+			while (!(sinp(UART_LSR) & UART_LSR_THRE))
+				;
+			output = 0x7f;
+			i = 0;
+		}
+	}
+	if (i != 0) {
+		soutp(UART_TX, output);
+		while (!(sinp(UART_LSR) & UART_LSR_TEMT))
+			;
+	}
+
+	if (i == 0)
+		ret = (-rawbits) * 10000 / 1152;
+	else
+		ret = (3 - i) * 3 * 10000 / 1152 + (-rawbits) * 10000 / 1152;
+
+	return ret;
+}
+
+#ifdef USE_RDTSC
+/* Version that uses Pentium rdtsc instruction to measure clocks */
+
+/*
+ * This version does sub-microsecond timing using rdtsc instruction,
+ * and does away with the fudged LIRC_SERIAL_TRANSMITTER_LATENCY
+ * Implicitly i586 architecture...  - Steve
+ */
+
+static long send_pulse_homebrew_softcarrier(unsigned long length)
+{
+	int flag;
+	unsigned long target, start, now;
+
+	/* Get going quick as we can */
+	rdtscl(start);
+	on();
+	/* Convert length from microseconds to clocks */
+	length *= conv_us_to_clocks;
+	/* And loop till time is up - flipping at right intervals */
+	now = start;
+	target = pulse_width;
+	flag = 1;
+	/*
+	 * FIXME: This looks like a hard busy wait, without even an occasional,
+	 * polite, cpu_relax() call.  There's got to be a better way?
+	 *
+	 * The i2c code has the result of a lot of bit-banging work, I wonder if
+	 * there's something there which could be helpful here.
+	 */
+	while ((now - start) < length) {
+		/* Delay till flip time */
+		do {
+			rdtscl(now);
+		} while ((now - start) < target);
+
+		/* flip */
+		if (flag) {
+			rdtscl(now);
+			off();
+			target += space_width;
+		} else {
+			rdtscl(now); on();
+			target += pulse_width;
+		}
+		flag = !flag;
+	}
+	rdtscl(now);
+	return ((now - start) - length) / conv_us_to_clocks;
+}
+#else /* ! USE_RDTSC */
+/* Version using udelay() */
+
+/*
+ * here we use fixed point arithmetic, with 8
+ * fractional bits.  that gets us within 0.1% or so of the right average
+ * frequency, albeit with some jitter in pulse length - Steve
+ */
+
+/* To match 8 fractional bits used for pulse/space length */
+
+static long send_pulse_homebrew_softcarrier(unsigned long length)
+{
+	int flag;
+	unsigned long actual, target, d;
+
+	length <<= 8;
+
+	actual = 0; target = 0; flag = 0;
+	while (actual < length) {
+		if (flag) {
+			off();
+			target += space_width;
+		} else {
+			on();
+			target += pulse_width;
+		}
+		d = (target - actual -
+		     LIRC_SERIAL_TRANSMITTER_LATENCY + 128) >> 8;
+		/*
+		 * Note - we've checked in ioctl that the pulse/space
+		 * widths are big enough so that d is > 0
+		 */
+		udelay(d);
+		actual += (d << 8) + LIRC_SERIAL_TRANSMITTER_LATENCY;
+		flag = !flag;
+	}
+	return (actual-length) >> 8;
+}
+#endif /* USE_RDTSC */
+
+static long send_pulse_homebrew(unsigned long length)
+{
+	if (length <= 0)
+		return 0;
+
+	if (softcarrier)
+		return send_pulse_homebrew_softcarrier(length);
+
+	on();
+	safe_udelay(length);
+	return 0;
+}
+
+static void send_space_irdeo(long length)
+{
+	if (length <= 0)
+		return;
+
+	safe_udelay(length);
+}
+
+static void send_space_homebrew(long length)
+{
+	off();
+	if (length <= 0)
+		return;
+	safe_udelay(length);
+}
+
+static void rbwrite(int l)
+{
+	if (lirc_buffer_full(&rbuf)) {
+		/* no new signals will be accepted */
+		dprintk("Buffer overrun\n");
+		return;
+	}
+	lirc_buffer_write(&rbuf, (void *)&l);
+}
+
+static void frbwrite(int l)
+{
+	/* simple noise filter */
+	static int pulse, space;
+	static unsigned int ptr;
+
+	if (ptr > 0 && (l & PULSE_BIT)) {
+		pulse += l & PULSE_MASK;
+		if (pulse > 250) {
+			rbwrite(space);
+			rbwrite(pulse | PULSE_BIT);
+			ptr = 0;
+			pulse = 0;
+		}
+		return;
+	}
+	if (!(l & PULSE_BIT)) {
+		if (ptr == 0) {
+			if (l > 20000) {
+				space = l;
+				ptr++;
+				return;
+			}
+		} else {
+			if (l > 20000) {
+				space += pulse;
+				if (space > PULSE_MASK)
+					space = PULSE_MASK;
+				space += l;
+				if (space > PULSE_MASK)
+					space = PULSE_MASK;
+				pulse = 0;
+				return;
+			}
+			rbwrite(space);
+			rbwrite(pulse | PULSE_BIT);
+			ptr = 0;
+			pulse = 0;
+		}
+	}
+	rbwrite(l);
+}
+
+static irqreturn_t lirc_irq_handler(int i, void *blah)
+{
+	struct timeval tv;
+	int counter, dcd;
+	u8 status;
+	long deltv;
+	int data;
+	static int last_dcd = -1;
+
+	if ((sinp(UART_IIR) & UART_IIR_NO_INT)) {
+		/* not our interrupt */
+		return IRQ_NONE;
+	}
+
+	counter = 0;
+	do {
+		counter++;
+		status = sinp(UART_MSR);
+		if (counter > RS_ISR_PASS_LIMIT) {
+			pr_warn("AIEEEE: We're caught!\n");
+			break;
+		}
+		if ((status & hardware[type].signal_pin_change)
+		    && sense != -1) {
+			/* get current time */
+			do_gettimeofday(&tv);
+
+			/* New mode, written by Trent Piepho
+			   <xyzzy@u.washington.edu>. */
+
+			/*
+			 * The old format was not very portable.
+			 * We now use an int to pass pulses
+			 * and spaces to user space.
+			 *
+			 * If PULSE_BIT is set a pulse has been
+			 * received, otherwise a space has been
+			 * received.  The driver needs to know if your
+			 * receiver is active high or active low, or
+			 * the space/pulse sense could be
+			 * inverted. The bits denoted by PULSE_MASK are
+			 * the length in microseconds. Lengths greater
+			 * than or equal to 16 seconds are clamped to
+			 * PULSE_MASK.  All other bits are unused.
+			 * This is a much simpler interface for user
+			 * programs, as well as eliminating "out of
+			 * phase" errors with space/pulse
+			 * autodetection.
+			 */
+
+			/* calc time since last interrupt in microseconds */
+			dcd = (status & hardware[type].signal_pin) ? 1 : 0;
+
+			if (dcd == last_dcd) {
+				pr_warn("ignoring spike: %d %d %lx %lx %lx %lx\n",
+					dcd, sense,
+					tv.tv_sec, lasttv.tv_sec,
+					(unsigned long)tv.tv_usec,
+					(unsigned long)lasttv.tv_usec);
+				continue;
+			}
+
+			deltv = tv.tv_sec-lasttv.tv_sec;
+			if (tv.tv_sec < lasttv.tv_sec ||
+			    (tv.tv_sec == lasttv.tv_sec &&
+			     tv.tv_usec < lasttv.tv_usec)) {
+				pr_warn("AIEEEE: your clock just jumped backwards\n");
+				pr_warn("%d %d %lx %lx %lx %lx\n",
+					dcd, sense,
+					tv.tv_sec, lasttv.tv_sec,
+					(unsigned long)tv.tv_usec,
+					(unsigned long)lasttv.tv_usec);
+				data = PULSE_MASK;
+			} else if (deltv > 15) {
+				data = PULSE_MASK; /* really long time */
+				if (!(dcd^sense)) {
+					/* sanity check */
+					pr_warn("AIEEEE: %d %d %lx %lx %lx %lx\n",
+						dcd, sense,
+						tv.tv_sec, lasttv.tv_sec,
+						(unsigned long)tv.tv_usec,
+						(unsigned long)lasttv.tv_usec);
+					/*
+					 * detecting pulse while this
+					 * MUST be a space!
+					 */
+					sense = sense ? 0 : 1;
+				}
+			} else
+				data = (int) (deltv*1000000 +
+					       tv.tv_usec -
+					       lasttv.tv_usec);
+			frbwrite(dcd^sense ? data : (data|PULSE_BIT));
+			lasttv = tv;
+			last_dcd = dcd;
+			wake_up_interruptible(&rbuf.wait_poll);
+		}
+	} while (!(sinp(UART_IIR) & UART_IIR_NO_INT)); /* still pending ? */
+	return IRQ_HANDLED;
+}
+
+
+static int hardware_init_port(void)
+{
+	u8 scratch, scratch2, scratch3;
+
+	/*
+	 * This is a simple port existence test, borrowed from the autoconfig
+	 * function in drivers/serial/8250.c
+	 */
+	scratch = sinp(UART_IER);
+	soutp(UART_IER, 0);
+#ifdef __i386__
+	outb(0xff, 0x080);
+#endif
+	scratch2 = sinp(UART_IER) & 0x0f;
+	soutp(UART_IER, 0x0f);
+#ifdef __i386__
+	outb(0x00, 0x080);
+#endif
+	scratch3 = sinp(UART_IER) & 0x0f;
+	soutp(UART_IER, scratch);
+	if (scratch2 != 0 || scratch3 != 0x0f) {
+		/* we fail, there's nothing here */
+		pr_err("port existence test failed, cannot continue\n");
+		return -ENODEV;
+	}
+
+
+
+	/* Set DLAB 0. */
+	soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
+
+	/* First of all, disable all interrupts */
+	soutp(UART_IER, sinp(UART_IER) &
+	      (~(UART_IER_MSI|UART_IER_RLSI|UART_IER_THRI|UART_IER_RDI)));
+
+	/* Clear registers. */
+	sinp(UART_LSR);
+	sinp(UART_RX);
+	sinp(UART_IIR);
+	sinp(UART_MSR);
+
+	/* Set line for power source */
+	off();
+
+	/* Clear registers again to be sure. */
+	sinp(UART_LSR);
+	sinp(UART_RX);
+	sinp(UART_IIR);
+	sinp(UART_MSR);
+
+	switch (type) {
+	case LIRC_IRDEO:
+	case LIRC_IRDEO_REMOTE:
+		/* setup port to 7N1 @ 115200 Baud */
+		/* 7N1+start = 9 bits at 115200 ~ 3 bits at 38kHz */
+
+		/* Set DLAB 1. */
+		soutp(UART_LCR, sinp(UART_LCR) | UART_LCR_DLAB);
+		/* Set divisor to 1 => 115200 Baud */
+		soutp(UART_DLM, 0);
+		soutp(UART_DLL, 1);
+		/* Set DLAB 0 +  7N1 */
+		soutp(UART_LCR, UART_LCR_WLEN7);
+		/* THR interrupt already disabled at this point */
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static int lirc_serial_probe(struct platform_device *dev)
+{
+	int i, nlow, nhigh, result;
+
+	result = devm_request_irq(&dev->dev, irq, lirc_irq_handler,
+			     (share_irq ? IRQF_SHARED : 0),
+			     LIRC_DRIVER_NAME, &hardware);
+	if (result < 0) {
+		if (result == -EBUSY)
+			dev_err(&dev->dev, "IRQ %d busy\n", irq);
+		else if (result == -EINVAL)
+			dev_err(&dev->dev, "Bad irq number or handler\n");
+		return result;
+	}
+
+	/* Reserve io region. */
+	/*
+	 * Future MMAP-Developers: Attention!
+	 * For memory mapped I/O you *might* need to use ioremap() first,
+	 * for the NSLU2 it's done in boot code.
+	 */
+	if (((iommap)
+	     && (devm_request_mem_region(&dev->dev, iommap, 8 << ioshift,
+					 LIRC_DRIVER_NAME) == NULL))
+	   || ((!iommap)
+	       && (devm_request_region(&dev->dev, io, 8,
+				       LIRC_DRIVER_NAME) == NULL))) {
+		dev_err(&dev->dev, "port %04x already in use\n", io);
+		dev_warn(&dev->dev, "use 'setserial /dev/ttySX uart none'\n");
+		dev_warn(&dev->dev,
+			 "or compile the serial port driver as module and\n");
+		dev_warn(&dev->dev, "make sure this module is loaded first\n");
+		return -EBUSY;
+	}
+
+	result = hardware_init_port();
+	if (result < 0)
+		return result;
+
+	/* Initialize pulse/space widths */
+	init_timing_params(duty_cycle, freq);
+
+	/* If pin is high, then this must be an active low receiver. */
+	if (sense == -1) {
+		/* wait 1/2 sec for the power supply */
+		msleep(500);
+
+		/*
+		 * probe 9 times every 0.04s, collect "votes" for
+		 * active high/low
+		 */
+		nlow = 0;
+		nhigh = 0;
+		for (i = 0; i < 9; i++) {
+			if (sinp(UART_MSR) & hardware[type].signal_pin)
+				nlow++;
+			else
+				nhigh++;
+			msleep(40);
+		}
+		sense = nlow >= nhigh ? 1 : 0;
+		dev_info(&dev->dev, "auto-detected active %s receiver\n",
+			 sense ? "low" : "high");
+	} else
+		dev_info(&dev->dev, "Manually using active %s receiver\n",
+			 sense ? "low" : "high");
+
+	dprintk("Interrupt %d, port %04x obtained\n", irq, io);
+	return 0;
+}
+
+static int set_use_inc(void *data)
+{
+	unsigned long flags;
+
+	/* initialize timestamp */
+	do_gettimeofday(&lasttv);
+
+	spin_lock_irqsave(&hardware[type].lock, flags);
+
+	/* Set DLAB 0. */
+	soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
+
+	soutp(UART_IER, sinp(UART_IER)|UART_IER_MSI);
+
+	spin_unlock_irqrestore(&hardware[type].lock, flags);
+
+	return 0;
+}
+
+static void set_use_dec(void *data)
+{	unsigned long flags;
+
+	spin_lock_irqsave(&hardware[type].lock, flags);
+
+	/* Set DLAB 0. */
+	soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
+
+	/* First of all, disable all interrupts */
+	soutp(UART_IER, sinp(UART_IER) &
+	      (~(UART_IER_MSI|UART_IER_RLSI|UART_IER_THRI|UART_IER_RDI)));
+	spin_unlock_irqrestore(&hardware[type].lock, flags);
+}
+
+static ssize_t lirc_write(struct file *file, const char __user *buf,
+			 size_t n, loff_t *ppos)
+{
+	int i, count;
+	unsigned long flags;
+	long delta = 0;
+	int *wbuf;
+
+	if (!(hardware[type].features & LIRC_CAN_SEND_PULSE))
+		return -EPERM;
+
+	count = n / sizeof(int);
+	if (n % sizeof(int) || count % 2 == 0)
+		return -EINVAL;
+	wbuf = memdup_user(buf, n);
+	if (IS_ERR(wbuf))
+		return PTR_ERR(wbuf);
+	spin_lock_irqsave(&hardware[type].lock, flags);
+	if (type == LIRC_IRDEO) {
+		/* DTR, RTS down */
+		on();
+	}
+	for (i = 0; i < count; i++) {
+		if (i%2)
+			hardware[type].send_space(wbuf[i] - delta);
+		else
+			delta = hardware[type].send_pulse(wbuf[i]);
+	}
+	off();
+	spin_unlock_irqrestore(&hardware[type].lock, flags);
+	kfree(wbuf);
+	return n;
+}
+
+static long lirc_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
+{
+	int result;
+	u32 __user *uptr = (u32 __user *)arg;
+	u32 value;
+
+	switch (cmd) {
+	case LIRC_GET_SEND_MODE:
+		if (!(hardware[type].features&LIRC_CAN_SEND_MASK))
+			return -ENOIOCTLCMD;
+
+		result = put_user(LIRC_SEND2MODE
+				  (hardware[type].features&LIRC_CAN_SEND_MASK),
+				  uptr);
+		if (result)
+			return result;
+		break;
+
+	case LIRC_SET_SEND_MODE:
+		if (!(hardware[type].features&LIRC_CAN_SEND_MASK))
+			return -ENOIOCTLCMD;
+
+		result = get_user(value, uptr);
+		if (result)
+			return result;
+		/* only LIRC_MODE_PULSE supported */
+		if (value != LIRC_MODE_PULSE)
+			return -EINVAL;
+		break;
+
+	case LIRC_GET_LENGTH:
+		return -ENOIOCTLCMD;
+
+	case LIRC_SET_SEND_DUTY_CYCLE:
+		dprintk("SET_SEND_DUTY_CYCLE\n");
+		if (!(hardware[type].features&LIRC_CAN_SET_SEND_DUTY_CYCLE))
+			return -ENOIOCTLCMD;
+
+		result = get_user(value, uptr);
+		if (result)
+			return result;
+		if (value <= 0 || value > 100)
+			return -EINVAL;
+		return init_timing_params(value, freq);
+
+	case LIRC_SET_SEND_CARRIER:
+		dprintk("SET_SEND_CARRIER\n");
+		if (!(hardware[type].features&LIRC_CAN_SET_SEND_CARRIER))
+			return -ENOIOCTLCMD;
+
+		result = get_user(value, uptr);
+		if (result)
+			return result;
+		if (value > 500000 || value < 20000)
+			return -EINVAL;
+		return init_timing_params(duty_cycle, value);
+
+	default:
+		return lirc_dev_fop_ioctl(filep, cmd, arg);
+	}
+	return 0;
+}
+
+static const struct file_operations lirc_fops = {
+	.owner		= THIS_MODULE,
+	.write		= lirc_write,
+	.unlocked_ioctl	= lirc_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl	= lirc_ioctl,
+#endif
+	.read		= lirc_dev_fop_read,
+	.poll		= lirc_dev_fop_poll,
+	.open		= lirc_dev_fop_open,
+	.release	= lirc_dev_fop_close,
+	.llseek		= no_llseek,
+};
+
+static struct lirc_driver driver = {
+	.name		= LIRC_DRIVER_NAME,
+	.minor		= -1,
+	.code_length	= 1,
+	.sample_rate	= 0,
+	.data		= NULL,
+	.add_to_buf	= NULL,
+	.rbuf		= &rbuf,
+	.set_use_inc	= set_use_inc,
+	.set_use_dec	= set_use_dec,
+	.fops		= &lirc_fops,
+	.dev		= NULL,
+	.owner		= THIS_MODULE,
+};
+
+static struct platform_device *lirc_serial_dev;
+
+static int lirc_serial_suspend(struct platform_device *dev,
+			       pm_message_t state)
+{
+	/* Set DLAB 0. */
+	soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
+
+	/* Disable all interrupts */
+	soutp(UART_IER, sinp(UART_IER) &
+	      (~(UART_IER_MSI|UART_IER_RLSI|UART_IER_THRI|UART_IER_RDI)));
+
+	/* Clear registers. */
+	sinp(UART_LSR);
+	sinp(UART_RX);
+	sinp(UART_IIR);
+	sinp(UART_MSR);
+
+	return 0;
+}
+
+/* twisty maze... need a forward-declaration here... */
+static void lirc_serial_exit(void);
+
+static int lirc_serial_resume(struct platform_device *dev)
+{
+	unsigned long flags;
+	int result;
+
+	result = hardware_init_port();
+	if (result < 0)
+		return result;
+
+	spin_lock_irqsave(&hardware[type].lock, flags);
+	/* Enable Interrupt */
+	do_gettimeofday(&lasttv);
+	soutp(UART_IER, sinp(UART_IER)|UART_IER_MSI);
+	off();
+
+	lirc_buffer_clear(&rbuf);
+
+	spin_unlock_irqrestore(&hardware[type].lock, flags);
+
+	return 0;
+}
+
+static struct platform_driver lirc_serial_driver = {
+	.probe		= lirc_serial_probe,
+	.suspend	= lirc_serial_suspend,
+	.resume		= lirc_serial_resume,
+	.driver		= {
+		.name	= "lirc_serial",
+	},
+};
+
+static int __init lirc_serial_init(void)
+{
+	int result;
+
+	/* Init read buffer. */
+	result = lirc_buffer_init(&rbuf, sizeof(int), RBUF_LEN);
+	if (result < 0)
+		return result;
+
+	result = platform_driver_register(&lirc_serial_driver);
+	if (result) {
+		printk("lirc register returned %d\n", result);
+		goto exit_buffer_free;
+	}
+
+	lirc_serial_dev = platform_device_alloc("lirc_serial", 0);
+	if (!lirc_serial_dev) {
+		result = -ENOMEM;
+		goto exit_driver_unregister;
+	}
+
+	result = platform_device_add(lirc_serial_dev);
+	if (result)
+		goto exit_device_put;
+
+	return 0;
+
+exit_device_put:
+	platform_device_put(lirc_serial_dev);
+exit_driver_unregister:
+	platform_driver_unregister(&lirc_serial_driver);
+exit_buffer_free:
+	lirc_buffer_free(&rbuf);
+	return result;
+}
+
+static void lirc_serial_exit(void)
+{
+	platform_device_unregister(lirc_serial_dev);
+	platform_driver_unregister(&lirc_serial_driver);
+	lirc_buffer_free(&rbuf);
+}
+
+static int __init lirc_serial_init_module(void)
+{
+	int result;
+
+	switch (type) {
+	case LIRC_HOMEBREW:
+	case LIRC_IRDEO:
+	case LIRC_IRDEO_REMOTE:
+	case LIRC_ANIMAX:
+	case LIRC_IGOR:
+		/* if nothing specified, use ttyS0/com1 and irq 4 */
+		io = io ? io : 0x3f8;
+		irq = irq ? irq : 4;
+		break;
+	default:
+		return -EINVAL;
+	}
+	if (!softcarrier) {
+		switch (type) {
+		case LIRC_HOMEBREW:
+		case LIRC_IGOR:
+			hardware[type].features &=
+				~(LIRC_CAN_SET_SEND_DUTY_CYCLE|
+				  LIRC_CAN_SET_SEND_CARRIER);
+			break;
+		}
+	}
+
+	/* make sure sense is either -1, 0, or 1 */
+	if (sense != -1)
+		sense = !!sense;
+
+	result = lirc_serial_init();
+	if (result)
+		return result;
+
+	driver.features = hardware[type].features;
+	driver.dev = &lirc_serial_dev->dev;
+	driver.minor = lirc_register_driver(&driver);
+	if (driver.minor < 0) {
+		pr_err("register_chrdev failed!\n");
+		lirc_serial_exit();
+		return driver.minor;
+	}
+	return 0;
+}
+
+static void __exit lirc_serial_exit_module(void)
+{
+	lirc_unregister_driver(driver.minor);
+	lirc_serial_exit();
+	dprintk("cleaned up module\n");
+}
+
+
+module_init(lirc_serial_init_module);
+module_exit(lirc_serial_exit_module);
+
+MODULE_DESCRIPTION("Infra-red receiver driver for serial ports.");
+MODULE_AUTHOR("Ralph Metzler, Trent Piepho, Ben Pfaff, "
+	      "Christoph Bartelmus, Andrei Tanas");
+MODULE_LICENSE("GPL");
+
+module_param(type, int, S_IRUGO);
+MODULE_PARM_DESC(type, "Hardware type (0 = home-brew, 1 = IRdeo,"
+		 " 2 = IRdeo Remote, 3 = AnimaX, 4 = IgorPlug,"
+		 " 5 = NSLU2 RX:CTS2/TX:GreenLED)");
+
+module_param(io, int, S_IRUGO);
+MODULE_PARM_DESC(io, "I/O address base (0x3f8 or 0x2f8)");
+
+/* some architectures (e.g. intel xscale) have memory mapped registers */
+module_param(iommap, bool, S_IRUGO);
+MODULE_PARM_DESC(iommap, "physical base for memory mapped I/O"
+		" (0 = no memory mapped io)");
+
+/*
+ * some architectures (e.g. intel xscale) align the 8bit serial registers
+ * on 32bit word boundaries.
+ * See linux-kernel/drivers/tty/serial/8250/8250.c serial_in()/out()
+ */
+module_param(ioshift, int, S_IRUGO);
+MODULE_PARM_DESC(ioshift, "shift I/O register offset (0 = no shift)");
+
+module_param(irq, int, S_IRUGO);
+MODULE_PARM_DESC(irq, "Interrupt (4 or 3)");
+
+module_param(share_irq, bool, S_IRUGO);
+MODULE_PARM_DESC(share_irq, "Share interrupts (0 = off, 1 = on)");
+
+module_param(sense, int, S_IRUGO);
+MODULE_PARM_DESC(sense, "Override autodetection of IR receiver circuit"
+		 " (0 = active high, 1 = active low )");
+
+#ifdef CONFIG_LIRC_SERIAL_TRANSMITTER
+module_param(txsense, bool, S_IRUGO);
+MODULE_PARM_DESC(txsense, "Sense of transmitter circuit"
+		 " (0 = active high, 1 = active low )");
+#endif
+
+module_param(softcarrier, bool, S_IRUGO);
+MODULE_PARM_DESC(softcarrier, "Software carrier (0 = off, 1 = on, default on)");
+
+module_param(debug, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Enable debugging messages");
diff --git a/drivers/staging/media/lirc/lirc_sir.c b/drivers/staging/media/lirc/lirc_sir.c
new file mode 100644
index 000000000..29087f66e
--- /dev/null
+++ b/drivers/staging/media/lirc/lirc_sir.c
@@ -0,0 +1,1014 @@
+/*
+ * LIRC SIR driver, (C) 2000 Milan Pikula <www@fornax.sk>
+ *
+ * lirc_sir - Device driver for use with SIR (serial infra red)
+ * mode of IrDA on many notebooks.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ *
+ * 2000/09/16 Frank Przybylski <mail@frankprzybylski.de> :
+ *  added timeout and relaxed pulse detection, removed gap bug
+ *
+ * 2000/12/15 Christoph Bartelmus <lirc@bartelmus.de> :
+ *   added support for Tekram Irmate 210 (sending does not work yet,
+ *   kind of disappointing that nobody was able to implement that
+ *   before),
+ *   major clean-up
+ *
+ * 2001/02/27 Christoph Bartelmus <lirc@bartelmus.de> :
+ *   added support for StrongARM SA1100 embedded microprocessor
+ *   parts cut'n'pasted from sa1100_ir.c (C) 2000 Russell King
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/fs.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/serial_reg.h>
+#include <linux/time.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/wait.h>
+#include <linux/mm.h>
+#include <linux/delay.h>
+#include <linux/poll.h>
+#include <linux/io.h>
+#include <asm/irq.h>
+#include <linux/fcntl.h>
+#include <linux/platform_device.h>
+
+#include <linux/timer.h>
+
+#include <media/lirc.h>
+#include <media/lirc_dev.h>
+
+/* SECTION: Definitions */
+
+/*** Tekram dongle ***/
+#ifdef LIRC_SIR_TEKRAM
+/* stolen from kernel source */
+/* definitions for Tekram dongle */
+#define TEKRAM_115200 0x00
+#define TEKRAM_57600  0x01
+#define TEKRAM_38400  0x02
+#define TEKRAM_19200  0x03
+#define TEKRAM_9600   0x04
+#define TEKRAM_2400   0x08
+
+#define TEKRAM_PW 0x10 /* Pulse select bit */
+
+/* 10bit * 1s/115200bit in milliseconds = 87ms*/
+#define TIME_CONST (10000000ul/115200ul)
+
+#endif
+
+#ifdef LIRC_SIR_ACTISYS_ACT200L
+static void init_act200(void);
+#elif defined(LIRC_SIR_ACTISYS_ACT220L)
+static void init_act220(void);
+#endif
+
+#define RBUF_LEN 1024
+#define WBUF_LEN 1024
+
+#define LIRC_DRIVER_NAME "lirc_sir"
+
+#define PULSE '['
+
+#ifndef LIRC_SIR_TEKRAM
+/* 9bit * 1s/115200bit in milli seconds = 78.125ms*/
+#define TIME_CONST (9000000ul/115200ul)
+#endif
+
+
+/* timeout for sequences in jiffies (=5/100s), must be longer than TIME_CONST */
+#define SIR_TIMEOUT	(HZ*5/100)
+
+#ifndef LIRC_ON_SA1100
+#ifndef LIRC_IRQ
+#define LIRC_IRQ 4
+#endif
+#ifndef LIRC_PORT
+/* for external dongles, default to com1 */
+#if defined(LIRC_SIR_ACTISYS_ACT200L)         || \
+	    defined(LIRC_SIR_ACTISYS_ACT220L) || \
+	    defined(LIRC_SIR_TEKRAM)
+#define LIRC_PORT 0x3f8
+#else
+/* onboard sir ports are typically com3 */
+#define LIRC_PORT 0x3e8
+#endif
+#endif
+
+static int io = LIRC_PORT;
+static int irq = LIRC_IRQ;
+static int threshold = 3;
+#endif
+
+static DEFINE_SPINLOCK(timer_lock);
+static struct timer_list timerlist;
+/* time of last signal change detected */
+static struct timeval last_tv = {0, 0};
+/* time of last UART data ready interrupt */
+static struct timeval last_intr_tv = {0, 0};
+static int last_value;
+
+static DECLARE_WAIT_QUEUE_HEAD(lirc_read_queue);
+
+static DEFINE_SPINLOCK(hardware_lock);
+
+static int rx_buf[RBUF_LEN];
+static unsigned int rx_tail, rx_head;
+
+static bool debug;
+
+/* SECTION: Prototypes */
+
+/* Communication with user-space */
+static unsigned int lirc_poll(struct file *file, poll_table *wait);
+static ssize_t lirc_read(struct file *file, char __user *buf, size_t count,
+			 loff_t *ppos);
+static ssize_t lirc_write(struct file *file, const char __user *buf, size_t n,
+			  loff_t *pos);
+static long lirc_ioctl(struct file *filep, unsigned int cmd, unsigned long arg);
+static void add_read_queue(int flag, unsigned long val);
+static int init_chrdev(void);
+static void drop_chrdev(void);
+/* Hardware */
+static irqreturn_t sir_interrupt(int irq, void *dev_id);
+static void send_space(unsigned long len);
+static void send_pulse(unsigned long len);
+static int init_hardware(void);
+static void drop_hardware(void);
+/* Initialisation */
+static int init_port(void);
+static void drop_port(void);
+
+static inline unsigned int sinp(int offset)
+{
+	return inb(io + offset);
+}
+
+static inline void soutp(int offset, int value)
+{
+	outb(value, io + offset);
+}
+
+#ifndef MAX_UDELAY_MS
+#define MAX_UDELAY_US 5000
+#else
+#define MAX_UDELAY_US (MAX_UDELAY_MS*1000)
+#endif
+
+static void safe_udelay(unsigned long usecs)
+{
+	while (usecs > MAX_UDELAY_US) {
+		udelay(MAX_UDELAY_US);
+		usecs -= MAX_UDELAY_US;
+	}
+	udelay(usecs);
+}
+
+/* SECTION: Communication with user-space */
+
+static unsigned int lirc_poll(struct file *file, poll_table *wait)
+{
+	poll_wait(file, &lirc_read_queue, wait);
+	if (rx_head != rx_tail)
+		return POLLIN | POLLRDNORM;
+	return 0;
+}
+
+static ssize_t lirc_read(struct file *file, char __user *buf, size_t count,
+			 loff_t *ppos)
+{
+	int n = 0;
+	int retval = 0;
+	DECLARE_WAITQUEUE(wait, current);
+
+	if (count % sizeof(int))
+		return -EINVAL;
+
+	add_wait_queue(&lirc_read_queue, &wait);
+	set_current_state(TASK_INTERRUPTIBLE);
+	while (n < count) {
+		if (rx_head != rx_tail) {
+			if (copy_to_user(buf + n,
+					 rx_buf + rx_head,
+					 sizeof(int))) {
+				retval = -EFAULT;
+				break;
+			}
+			rx_head = (rx_head + 1) & (RBUF_LEN - 1);
+			n += sizeof(int);
+		} else {
+			if (file->f_flags & O_NONBLOCK) {
+				retval = -EAGAIN;
+				break;
+			}
+			if (signal_pending(current)) {
+				retval = -ERESTARTSYS;
+				break;
+			}
+			schedule();
+			set_current_state(TASK_INTERRUPTIBLE);
+		}
+	}
+	remove_wait_queue(&lirc_read_queue, &wait);
+	set_current_state(TASK_RUNNING);
+	return n ? n : retval;
+}
+static ssize_t lirc_write(struct file *file, const char __user *buf, size_t n,
+			  loff_t *pos)
+{
+	unsigned long flags;
+	int i, count;
+	int *tx_buf;
+
+	count = n / sizeof(int);
+	if (n % sizeof(int) || count % 2 == 0)
+		return -EINVAL;
+	tx_buf = memdup_user(buf, n);
+	if (IS_ERR(tx_buf))
+		return PTR_ERR(tx_buf);
+	i = 0;
+	local_irq_save(flags);
+	while (1) {
+		if (i >= count)
+			break;
+		if (tx_buf[i])
+			send_pulse(tx_buf[i]);
+		i++;
+		if (i >= count)
+			break;
+		if (tx_buf[i])
+			send_space(tx_buf[i]);
+		i++;
+	}
+	local_irq_restore(flags);
+	kfree(tx_buf);
+	return count;
+}
+
+static long lirc_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
+{
+	u32 __user *uptr = (u32 __user *)arg;
+	int retval = 0;
+	u32 value = 0;
+
+	if (cmd == LIRC_GET_FEATURES)
+		value = LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2;
+	else if (cmd == LIRC_GET_SEND_MODE)
+		value = LIRC_MODE_PULSE;
+	else if (cmd == LIRC_GET_REC_MODE)
+		value = LIRC_MODE_MODE2;
+
+	switch (cmd) {
+	case LIRC_GET_FEATURES:
+	case LIRC_GET_SEND_MODE:
+	case LIRC_GET_REC_MODE:
+		retval = put_user(value, uptr);
+		break;
+
+	case LIRC_SET_SEND_MODE:
+	case LIRC_SET_REC_MODE:
+		retval = get_user(value, uptr);
+		break;
+	default:
+		retval = -ENOIOCTLCMD;
+
+	}
+
+	if (retval)
+		return retval;
+	if (cmd == LIRC_SET_REC_MODE) {
+		if (value != LIRC_MODE_MODE2)
+			retval = -ENOSYS;
+	} else if (cmd == LIRC_SET_SEND_MODE) {
+		if (value != LIRC_MODE_PULSE)
+			retval = -ENOSYS;
+	}
+
+	return retval;
+}
+
+static void add_read_queue(int flag, unsigned long val)
+{
+	unsigned int new_rx_tail;
+	int newval;
+
+	pr_debug("add flag %d with val %lu\n", flag, val);
+
+	newval = val & PULSE_MASK;
+
+	/*
+	 * statistically, pulses are ~TIME_CONST/2 too long. we could
+	 * maybe make this more exact, but this is good enough
+	 */
+	if (flag) {
+		/* pulse */
+		if (newval > TIME_CONST/2)
+			newval -= TIME_CONST/2;
+		else /* should not ever happen */
+			newval = 1;
+		newval |= PULSE_BIT;
+	} else {
+		newval += TIME_CONST/2;
+	}
+	new_rx_tail = (rx_tail + 1) & (RBUF_LEN - 1);
+	if (new_rx_tail == rx_head) {
+		pr_debug("Buffer overrun.\n");
+		return;
+	}
+	rx_buf[rx_tail] = newval;
+	rx_tail = new_rx_tail;
+	wake_up_interruptible(&lirc_read_queue);
+}
+
+static const struct file_operations lirc_fops = {
+	.owner		= THIS_MODULE,
+	.read		= lirc_read,
+	.write		= lirc_write,
+	.poll		= lirc_poll,
+	.unlocked_ioctl	= lirc_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl	= lirc_ioctl,
+#endif
+	.open		= lirc_dev_fop_open,
+	.release	= lirc_dev_fop_close,
+	.llseek		= no_llseek,
+};
+
+static int set_use_inc(void *data)
+{
+	return 0;
+}
+
+static void set_use_dec(void *data)
+{
+}
+
+static struct lirc_driver driver = {
+	.name		= LIRC_DRIVER_NAME,
+	.minor		= -1,
+	.code_length	= 1,
+	.sample_rate	= 0,
+	.data		= NULL,
+	.add_to_buf	= NULL,
+	.set_use_inc	= set_use_inc,
+	.set_use_dec	= set_use_dec,
+	.fops		= &lirc_fops,
+	.dev		= NULL,
+	.owner		= THIS_MODULE,
+};
+
+static struct platform_device *lirc_sir_dev;
+
+static int init_chrdev(void)
+{
+	driver.dev = &lirc_sir_dev->dev;
+	driver.minor = lirc_register_driver(&driver);
+	if (driver.minor < 0) {
+		pr_err("init_chrdev() failed.\n");
+		return -EIO;
+	}
+	return 0;
+}
+
+static void drop_chrdev(void)
+{
+	lirc_unregister_driver(driver.minor);
+}
+
+/* SECTION: Hardware */
+static long delta(struct timeval *tv1, struct timeval *tv2)
+{
+	unsigned long deltv;
+
+	deltv = tv2->tv_sec - tv1->tv_sec;
+	if (deltv > 15)
+		deltv = 0xFFFFFF;
+	else
+		deltv = deltv*1000000 +
+			tv2->tv_usec -
+			tv1->tv_usec;
+	return deltv;
+}
+
+static void sir_timeout(unsigned long data)
+{
+	/*
+	 * if last received signal was a pulse, but receiving stopped
+	 * within the 9 bit frame, we need to finish this pulse and
+	 * simulate a signal change to from pulse to space. Otherwise
+	 * upper layers will receive two sequences next time.
+	 */
+
+	unsigned long flags;
+	unsigned long pulse_end;
+
+	/* avoid interference with interrupt */
+	spin_lock_irqsave(&timer_lock, flags);
+	if (last_value) {
+		/* clear unread bits in UART and restart */
+		outb(UART_FCR_CLEAR_RCVR, io + UART_FCR);
+		/* determine 'virtual' pulse end: */
+		pulse_end = delta(&last_tv, &last_intr_tv);
+		dev_dbg(driver.dev, "timeout add %d for %lu usec\n",
+				    last_value, pulse_end);
+		add_read_queue(last_value, pulse_end);
+		last_value = 0;
+		last_tv = last_intr_tv;
+	}
+	spin_unlock_irqrestore(&timer_lock, flags);
+}
+
+static irqreturn_t sir_interrupt(int irq, void *dev_id)
+{
+	unsigned char data;
+	struct timeval curr_tv;
+	static unsigned long deltv;
+	unsigned long deltintrtv;
+	unsigned long flags;
+	int iir, lsr;
+
+	while ((iir = inb(io + UART_IIR) & UART_IIR_ID)) {
+		switch (iir&UART_IIR_ID) { /* FIXME toto treba preriedit */
+		case UART_IIR_MSI:
+			(void) inb(io + UART_MSR);
+			break;
+		case UART_IIR_RLSI:
+			(void) inb(io + UART_LSR);
+			break;
+		case UART_IIR_THRI:
+#if 0
+			if (lsr & UART_LSR_THRE) /* FIFO is empty */
+				outb(data, io + UART_TX)
+#endif
+			break;
+		case UART_IIR_RDI:
+			/* avoid interference with timer */
+			spin_lock_irqsave(&timer_lock, flags);
+			do {
+				del_timer(&timerlist);
+				data = inb(io + UART_RX);
+				do_gettimeofday(&curr_tv);
+				deltv = delta(&last_tv, &curr_tv);
+				deltintrtv = delta(&last_intr_tv, &curr_tv);
+				dev_dbg(driver.dev, "t %lu, d %d\n",
+						    deltintrtv, (int)data);
+				/*
+				 * if nothing came in last X cycles,
+				 * it was gap
+				 */
+				if (deltintrtv > TIME_CONST * threshold) {
+					if (last_value) {
+						dev_dbg(driver.dev, "GAP\n");
+						/* simulate signal change */
+						add_read_queue(last_value,
+							       deltv -
+							       deltintrtv);
+						last_value = 0;
+						last_tv.tv_sec =
+							last_intr_tv.tv_sec;
+						last_tv.tv_usec =
+							last_intr_tv.tv_usec;
+						deltv = deltintrtv;
+					}
+				}
+				data = 1;
+				if (data ^ last_value) {
+					/*
+					 * deltintrtv > 2*TIME_CONST, remember?
+					 * the other case is timeout
+					 */
+					add_read_queue(last_value,
+						       deltv-TIME_CONST);
+					last_value = data;
+					last_tv = curr_tv;
+					if (last_tv.tv_usec >= TIME_CONST) {
+						last_tv.tv_usec -= TIME_CONST;
+					} else {
+						last_tv.tv_sec--;
+						last_tv.tv_usec += 1000000 -
+							TIME_CONST;
+					}
+				}
+				last_intr_tv = curr_tv;
+				if (data) {
+					/*
+					 * start timer for end of
+					 * sequence detection
+					 */
+					timerlist.expires = jiffies +
+								SIR_TIMEOUT;
+					add_timer(&timerlist);
+				}
+
+				lsr = inb(io + UART_LSR);
+			} while (lsr & UART_LSR_DR); /* data ready */
+			spin_unlock_irqrestore(&timer_lock, flags);
+			break;
+		default:
+			break;
+		}
+	}
+	return IRQ_RETVAL(IRQ_HANDLED);
+}
+
+static void send_space(unsigned long len)
+{
+	safe_udelay(len);
+}
+
+static void send_pulse(unsigned long len)
+{
+	long bytes_out = len / TIME_CONST;
+
+	if (bytes_out == 0)
+		bytes_out++;
+
+	while (bytes_out--) {
+		outb(PULSE, io + UART_TX);
+		/* FIXME treba seriozne cakanie z char/serial.c */
+		while (!(inb(io + UART_LSR) & UART_LSR_THRE))
+			;
+	}
+}
+
+static int init_hardware(void)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&hardware_lock, flags);
+	/* reset UART */
+#if defined(LIRC_SIR_TEKRAM)
+	/* disable FIFO */
+	soutp(UART_FCR,
+	      UART_FCR_CLEAR_RCVR|
+	      UART_FCR_CLEAR_XMIT|
+	      UART_FCR_TRIGGER_1);
+
+	/* Set DLAB 0. */
+	soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
+
+	/* First of all, disable all interrupts */
+	soutp(UART_IER, sinp(UART_IER) &
+	      (~(UART_IER_MSI|UART_IER_RLSI|UART_IER_THRI|UART_IER_RDI)));
+
+	/* Set DLAB 1. */
+	soutp(UART_LCR, sinp(UART_LCR) | UART_LCR_DLAB);
+
+	/* Set divisor to 12 => 9600 Baud */
+	soutp(UART_DLM, 0);
+	soutp(UART_DLL, 12);
+
+	/* Set DLAB 0. */
+	soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
+
+	/* power supply */
+	soutp(UART_MCR, UART_MCR_RTS|UART_MCR_DTR|UART_MCR_OUT2);
+	safe_udelay(50*1000);
+
+	/* -DTR low -> reset PIC */
+	soutp(UART_MCR, UART_MCR_RTS|UART_MCR_OUT2);
+	udelay(1*1000);
+
+	soutp(UART_MCR, UART_MCR_RTS|UART_MCR_DTR|UART_MCR_OUT2);
+	udelay(100);
+
+
+	/* -RTS low -> send control byte */
+	soutp(UART_MCR, UART_MCR_DTR|UART_MCR_OUT2);
+	udelay(7);
+	soutp(UART_TX, TEKRAM_115200|TEKRAM_PW);
+
+	/* one byte takes ~1042 usec to transmit at 9600,8N1 */
+	udelay(1500);
+
+	/* back to normal operation */
+	soutp(UART_MCR, UART_MCR_RTS|UART_MCR_DTR|UART_MCR_OUT2);
+	udelay(50);
+
+	udelay(1500);
+
+	/* read previous control byte */
+	pr_info("0x%02x\n", sinp(UART_RX));
+
+	/* Set DLAB 1. */
+	soutp(UART_LCR, sinp(UART_LCR) | UART_LCR_DLAB);
+
+	/* Set divisor to 1 => 115200 Baud */
+	soutp(UART_DLM, 0);
+	soutp(UART_DLL, 1);
+
+	/* Set DLAB 0, 8 Bit */
+	soutp(UART_LCR, UART_LCR_WLEN8);
+	/* enable interrupts */
+	soutp(UART_IER, sinp(UART_IER)|UART_IER_RDI);
+#else
+	outb(0, io + UART_MCR);
+	outb(0, io + UART_IER);
+	/* init UART */
+	/* set DLAB, speed = 115200 */
+	outb(UART_LCR_DLAB | UART_LCR_WLEN7, io + UART_LCR);
+	outb(1, io + UART_DLL); outb(0, io + UART_DLM);
+	/* 7N1+start = 9 bits at 115200 ~ 3 bits at 44000 */
+	outb(UART_LCR_WLEN7, io + UART_LCR);
+	/* FIFO operation */
+	outb(UART_FCR_ENABLE_FIFO, io + UART_FCR);
+	/* interrupts */
+	/* outb(UART_IER_RLSI|UART_IER_RDI|UART_IER_THRI, io + UART_IER); */
+	outb(UART_IER_RDI, io + UART_IER);
+	/* turn on UART */
+	outb(UART_MCR_DTR|UART_MCR_RTS|UART_MCR_OUT2, io + UART_MCR);
+#ifdef LIRC_SIR_ACTISYS_ACT200L
+	init_act200();
+#elif defined(LIRC_SIR_ACTISYS_ACT220L)
+	init_act220();
+#endif
+#endif
+	spin_unlock_irqrestore(&hardware_lock, flags);
+	return 0;
+}
+
+static void drop_hardware(void)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&hardware_lock, flags);
+
+	/* turn off interrupts */
+	outb(0, io + UART_IER);
+
+	spin_unlock_irqrestore(&hardware_lock, flags);
+}
+
+/* SECTION: Initialisation */
+
+static int init_port(void)
+{
+	int retval;
+
+	/* get I/O port access and IRQ line */
+	if (request_region(io, 8, LIRC_DRIVER_NAME) == NULL) {
+		pr_err("i/o port 0x%.4x already in use.\n", io);
+		return -EBUSY;
+	}
+	retval = request_irq(irq, sir_interrupt, 0,
+			     LIRC_DRIVER_NAME, NULL);
+	if (retval < 0) {
+		release_region(io, 8);
+		pr_err("IRQ %d already in use.\n", irq);
+		return retval;
+	}
+	pr_info("I/O port 0x%.4x, IRQ %d.\n", io, irq);
+
+	setup_timer(&timerlist, sir_timeout, 0);
+
+	return 0;
+}
+
+static void drop_port(void)
+{
+	free_irq(irq, NULL);
+	del_timer_sync(&timerlist);
+	release_region(io, 8);
+}
+
+#ifdef LIRC_SIR_ACTISYS_ACT200L
+/* Crystal/Cirrus CS8130 IR transceiver, used in Actisys Act200L dongle */
+/* some code borrowed from Linux IRDA driver */
+
+/* Register 0: Control register #1 */
+#define ACT200L_REG0    0x00
+#define ACT200L_TXEN    0x01 /* Enable transmitter */
+#define ACT200L_RXEN    0x02 /* Enable receiver */
+#define ACT200L_ECHO    0x08 /* Echo control chars */
+
+/* Register 1: Control register #2 */
+#define ACT200L_REG1    0x10
+#define ACT200L_LODB    0x01 /* Load new baud rate count value */
+#define ACT200L_WIDE    0x04 /* Expand the maximum allowable pulse */
+
+/* Register 3: Transmit mode register #2 */
+#define ACT200L_REG3    0x30
+#define ACT200L_B0      0x01 /* DataBits, 0=6, 1=7, 2=8, 3=9(8P)  */
+#define ACT200L_B1      0x02 /* DataBits, 0=6, 1=7, 2=8, 3=9(8P)  */
+#define ACT200L_CHSY    0x04 /* StartBit Synced 0=bittime, 1=startbit */
+
+/* Register 4: Output Power register */
+#define ACT200L_REG4    0x40
+#define ACT200L_OP0     0x01 /* Enable LED1C output */
+#define ACT200L_OP1     0x02 /* Enable LED2C output */
+#define ACT200L_BLKR    0x04
+
+/* Register 5: Receive Mode register */
+#define ACT200L_REG5    0x50
+#define ACT200L_RWIDL   0x01 /* fixed 1.6us pulse mode */
+    /*.. other various IRDA bit modes, and TV remote modes..*/
+
+/* Register 6: Receive Sensitivity register #1 */
+#define ACT200L_REG6    0x60
+#define ACT200L_RS0     0x01 /* receive threshold bit 0 */
+#define ACT200L_RS1     0x02 /* receive threshold bit 1 */
+
+/* Register 7: Receive Sensitivity register #2 */
+#define ACT200L_REG7    0x70
+#define ACT200L_ENPOS   0x04 /* Ignore the falling edge */
+
+/* Register 8,9: Baud Rate Divider register #1,#2 */
+#define ACT200L_REG8    0x80
+#define ACT200L_REG9    0x90
+
+#define ACT200L_2400    0x5f
+#define ACT200L_9600    0x17
+#define ACT200L_19200   0x0b
+#define ACT200L_38400   0x05
+#define ACT200L_57600   0x03
+#define ACT200L_115200  0x01
+
+/* Register 13: Control register #3 */
+#define ACT200L_REG13   0xd0
+#define ACT200L_SHDW    0x01 /* Enable access to shadow registers */
+
+/* Register 15: Status register */
+#define ACT200L_REG15   0xf0
+
+/* Register 21: Control register #4 */
+#define ACT200L_REG21   0x50
+#define ACT200L_EXCK    0x02 /* Disable clock output driver */
+#define ACT200L_OSCL    0x04 /* oscillator in low power, medium accuracy mode */
+
+static void init_act200(void)
+{
+	int i;
+	__u8 control[] = {
+		ACT200L_REG15,
+		ACT200L_REG13 | ACT200L_SHDW,
+		ACT200L_REG21 | ACT200L_EXCK | ACT200L_OSCL,
+		ACT200L_REG13,
+		ACT200L_REG7  | ACT200L_ENPOS,
+		ACT200L_REG6  | ACT200L_RS0  | ACT200L_RS1,
+		ACT200L_REG5  | ACT200L_RWIDL,
+		ACT200L_REG4  | ACT200L_OP0  | ACT200L_OP1 | ACT200L_BLKR,
+		ACT200L_REG3  | ACT200L_B0,
+		ACT200L_REG0  | ACT200L_TXEN | ACT200L_RXEN,
+		ACT200L_REG8 |  (ACT200L_115200       & 0x0f),
+		ACT200L_REG9 | ((ACT200L_115200 >> 4) & 0x0f),
+		ACT200L_REG1 | ACT200L_LODB | ACT200L_WIDE
+	};
+
+	/* Set DLAB 1. */
+	soutp(UART_LCR, UART_LCR_DLAB | UART_LCR_WLEN8);
+
+	/* Set divisor to 12 => 9600 Baud */
+	soutp(UART_DLM, 0);
+	soutp(UART_DLL, 12);
+
+	/* Set DLAB 0. */
+	soutp(UART_LCR, UART_LCR_WLEN8);
+	/* Set divisor to 12 => 9600 Baud */
+
+	/* power supply */
+	soutp(UART_MCR, UART_MCR_RTS|UART_MCR_DTR|UART_MCR_OUT2);
+	for (i = 0; i < 50; i++)
+		safe_udelay(1000);
+
+		/* Reset the dongle : set RTS low for 25 ms */
+	soutp(UART_MCR, UART_MCR_DTR|UART_MCR_OUT2);
+	for (i = 0; i < 25; i++)
+		udelay(1000);
+
+	soutp(UART_MCR, UART_MCR_RTS|UART_MCR_DTR|UART_MCR_OUT2);
+	udelay(100);
+
+	/* Clear DTR and set RTS to enter command mode */
+	soutp(UART_MCR, UART_MCR_RTS|UART_MCR_OUT2);
+	udelay(7);
+
+	/* send out the control register settings for 115K 7N1 SIR operation */
+	for (i = 0; i < sizeof(control); i++) {
+		soutp(UART_TX, control[i]);
+		/* one byte takes ~1042 usec to transmit at 9600,8N1 */
+		udelay(1500);
+	}
+
+	/* back to normal operation */
+	soutp(UART_MCR, UART_MCR_RTS|UART_MCR_DTR|UART_MCR_OUT2);
+	udelay(50);
+
+	udelay(1500);
+	soutp(UART_LCR, sinp(UART_LCR) | UART_LCR_DLAB);
+
+	/* Set DLAB 1. */
+	soutp(UART_LCR, UART_LCR_DLAB | UART_LCR_WLEN7);
+
+	/* Set divisor to 1 => 115200 Baud */
+	soutp(UART_DLM, 0);
+	soutp(UART_DLL, 1);
+
+	/* Set DLAB 0. */
+	soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
+
+	/* Set DLAB 0, 7 Bit */
+	soutp(UART_LCR, UART_LCR_WLEN7);
+
+	/* enable interrupts */
+	soutp(UART_IER, sinp(UART_IER)|UART_IER_RDI);
+}
+#endif
+
+#ifdef LIRC_SIR_ACTISYS_ACT220L
+/*
+ * Derived from linux IrDA driver (net/irda/actisys.c)
+ * Drop me a mail for any kind of comment: maxx@spaceboyz.net
+ */
+
+void init_act220(void)
+{
+	int i;
+
+	/* DLAB 1 */
+	soutp(UART_LCR, UART_LCR_DLAB|UART_LCR_WLEN7);
+
+	/* 9600 baud */
+	soutp(UART_DLM, 0);
+	soutp(UART_DLL, 12);
+
+	/* DLAB 0 */
+	soutp(UART_LCR, UART_LCR_WLEN7);
+
+	/* reset the dongle, set DTR low for 10us */
+	soutp(UART_MCR, UART_MCR_RTS|UART_MCR_OUT2);
+	udelay(10);
+
+	/* back to normal (still 9600) */
+	soutp(UART_MCR, UART_MCR_DTR|UART_MCR_RTS|UART_MCR_OUT2);
+
+	/*
+	 * send RTS pulses until we reach 115200
+	 * i hope this is really the same for act220l/act220l+
+	 */
+	for (i = 0; i < 3; i++) {
+		udelay(10);
+		/* set RTS low for 10 us */
+		soutp(UART_MCR, UART_MCR_DTR|UART_MCR_OUT2);
+		udelay(10);
+		/* set RTS high for 10 us */
+		soutp(UART_MCR, UART_MCR_RTS|UART_MCR_DTR|UART_MCR_OUT2);
+	}
+
+	/* back to normal operation */
+	udelay(1500); /* better safe than sorry ;) */
+
+	/* Set DLAB 1. */
+	soutp(UART_LCR, UART_LCR_DLAB | UART_LCR_WLEN7);
+
+	/* Set divisor to 1 => 115200 Baud */
+	soutp(UART_DLM, 0);
+	soutp(UART_DLL, 1);
+
+	/* Set DLAB 0, 7 Bit */
+	/* The dongle doesn't seem to have any problems with operation at 7N1 */
+	soutp(UART_LCR, UART_LCR_WLEN7);
+
+	/* enable interrupts */
+	soutp(UART_IER, UART_IER_RDI);
+}
+#endif
+
+static int init_lirc_sir(void)
+{
+	int retval;
+
+	init_waitqueue_head(&lirc_read_queue);
+	retval = init_port();
+	if (retval < 0)
+		return retval;
+	init_hardware();
+	pr_info("Installed.\n");
+	return 0;
+}
+
+static int lirc_sir_probe(struct platform_device *dev)
+{
+	return 0;
+}
+
+static int lirc_sir_remove(struct platform_device *dev)
+{
+	return 0;
+}
+
+static struct platform_driver lirc_sir_driver = {
+	.probe		= lirc_sir_probe,
+	.remove		= lirc_sir_remove,
+	.driver		= {
+		.name	= "lirc_sir",
+	},
+};
+
+static int __init lirc_sir_init(void)
+{
+	int retval;
+
+	retval = platform_driver_register(&lirc_sir_driver);
+	if (retval) {
+		pr_err("Platform driver register failed!\n");
+		return -ENODEV;
+	}
+
+	lirc_sir_dev = platform_device_alloc("lirc_dev", 0);
+	if (!lirc_sir_dev) {
+		pr_err("Platform device alloc failed!\n");
+		retval = -ENOMEM;
+		goto pdev_alloc_fail;
+	}
+
+	retval = platform_device_add(lirc_sir_dev);
+	if (retval) {
+		pr_err("Platform device add failed!\n");
+		retval = -ENODEV;
+		goto pdev_add_fail;
+	}
+
+	retval = init_chrdev();
+	if (retval < 0)
+		goto fail;
+
+	retval = init_lirc_sir();
+	if (retval) {
+		drop_chrdev();
+		goto fail;
+	}
+
+	return 0;
+
+fail:
+	platform_device_del(lirc_sir_dev);
+pdev_add_fail:
+	platform_device_put(lirc_sir_dev);
+pdev_alloc_fail:
+	platform_driver_unregister(&lirc_sir_driver);
+	return retval;
+}
+
+static void __exit lirc_sir_exit(void)
+{
+	drop_hardware();
+	drop_chrdev();
+	drop_port();
+	platform_device_unregister(lirc_sir_dev);
+	platform_driver_unregister(&lirc_sir_driver);
+	pr_info("Uninstalled.\n");
+}
+
+module_init(lirc_sir_init);
+module_exit(lirc_sir_exit);
+
+#ifdef LIRC_SIR_TEKRAM
+MODULE_DESCRIPTION("Infrared receiver driver for Tekram Irmate 210");
+MODULE_AUTHOR("Christoph Bartelmus");
+#elif defined(LIRC_SIR_ACTISYS_ACT200L)
+MODULE_DESCRIPTION("LIRC driver for Actisys Act200L");
+MODULE_AUTHOR("Karl Bongers");
+#elif defined(LIRC_SIR_ACTISYS_ACT220L)
+MODULE_DESCRIPTION("LIRC driver for Actisys Act220L(+)");
+MODULE_AUTHOR("Jan Roemisch");
+#else
+MODULE_DESCRIPTION("Infrared receiver driver for SIR type serial ports");
+MODULE_AUTHOR("Milan Pikula");
+#endif
+MODULE_LICENSE("GPL");
+
+module_param(io, int, S_IRUGO);
+MODULE_PARM_DESC(io, "I/O address base (0x3f8 or 0x2f8)");
+
+module_param(irq, int, S_IRUGO);
+MODULE_PARM_DESC(irq, "Interrupt (4 or 3)");
+
+module_param(threshold, int, S_IRUGO);
+MODULE_PARM_DESC(threshold, "space detection threshold (3)");
+
+module_param(debug, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Enable debugging messages");
diff --git a/drivers/staging/media/lirc/lirc_zilog.c b/drivers/staging/media/lirc/lirc_zilog.c
new file mode 100644
index 000000000..cc1b7f165
--- /dev/null
+++ b/drivers/staging/media/lirc/lirc_zilog.c
@@ -0,0 +1,1697 @@
+/*
+ * i2c IR lirc driver for devices with zilog IR processors
+ *
+ * Copyright (c) 2000 Gerd Knorr <kraxel@goldbach.in-berlin.de>
+ * modified for PixelView (BT878P+W/FM) by
+ *      Michal Kochanowicz <mkochano@pld.org.pl>
+ *      Christoph Bartelmus <lirc@bartelmus.de>
+ * modified for KNC ONE TV Station/Anubis Typhoon TView Tuner by
+ *      Ulrich Mueller <ulrich.mueller42@web.de>
+ * modified for Asus TV-Box and Creative/VisionTek BreakOut-Box by
+ *      Stefan Jahn <stefan@lkcc.org>
+ * modified for inclusion into kernel sources by
+ *      Jerome Brock <jbrock@users.sourceforge.net>
+ * modified for Leadtek Winfast PVR2000 by
+ *      Thomas Reitmayr (treitmayr@yahoo.com)
+ * modified for Hauppauge PVR-150 IR TX device by
+ *      Mark Weaver <mark@npsl.co.uk>
+ * changed name from lirc_pvr150 to lirc_zilog, works on more than pvr-150
+ *	Jarod Wilson <jarod@redhat.com>
+ *
+ * parts are cut&pasted from the lirc_i2c.c driver
+ *
+ * Numerous changes updating lirc_zilog.c in kernel 2.6.38 and later are
+ * Copyright (C) 2011 Andy Walls <awalls@md.metrocast.net>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kmod.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/poll.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/delay.h>
+#include <linux/completion.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/firmware.h>
+#include <linux/vmalloc.h>
+
+#include <linux/mutex.h>
+#include <linux/kthread.h>
+
+#include <media/lirc_dev.h>
+#include <media/lirc.h>
+
+/* Max transfer size done by I2C transfer functions */
+#define MAX_XFER_SIZE  64
+
+struct IR;
+
+struct IR_rx {
+	struct kref ref;
+	struct IR *ir;
+
+	/* RX device */
+	struct mutex client_lock;
+	struct i2c_client *c;
+
+	/* RX polling thread data */
+	struct task_struct *task;
+
+	/* RX read data */
+	unsigned char b[3];
+	bool hdpvr_data_fmt;
+};
+
+struct IR_tx {
+	struct kref ref;
+	struct IR *ir;
+
+	/* TX device */
+	struct mutex client_lock;
+	struct i2c_client *c;
+
+	/* TX additional actions needed */
+	int need_boot;
+	bool post_tx_ready_poll;
+};
+
+struct IR {
+	struct kref ref;
+	struct list_head list;
+
+	/* FIXME spinlock access to l.features */
+	struct lirc_driver l;
+	struct lirc_buffer rbuf;
+
+	struct mutex ir_lock;
+	atomic_t open_count;
+
+	struct i2c_adapter *adapter;
+
+	spinlock_t rx_ref_lock; /* struct IR_rx kref get()/put() */
+	struct IR_rx *rx;
+
+	spinlock_t tx_ref_lock; /* struct IR_tx kref get()/put() */
+	struct IR_tx *tx;
+};
+
+/* IR transceiver instance object list */
+/*
+ * This lock is used for the following:
+ * a. ir_devices_list access, insertions, deletions
+ * b. struct IR kref get()s and put()s
+ * c. serialization of ir_probe() for the two i2c_clients for a Z8
+ */
+static DEFINE_MUTEX(ir_devices_lock);
+static LIST_HEAD(ir_devices_list);
+
+/* Block size for IR transmitter */
+#define TX_BLOCK_SIZE	99
+
+/* Hauppauge IR transmitter data */
+struct tx_data_struct {
+	/* Boot block */
+	unsigned char *boot_data;
+
+	/* Start of binary data block */
+	unsigned char *datap;
+
+	/* End of binary data block */
+	unsigned char *endp;
+
+	/* Number of installed codesets */
+	unsigned int num_code_sets;
+
+	/* Pointers to codesets */
+	unsigned char **code_sets;
+
+	/* Global fixed data template */
+	int fixed[TX_BLOCK_SIZE];
+};
+
+static struct tx_data_struct *tx_data;
+static struct mutex tx_data_lock;
+
+
+/* module parameters */
+static bool debug;	/* debug output */
+static bool tx_only;	/* only handle the IR Tx function */
+static int minor = -1;	/* minor number */
+
+
+/* struct IR reference counting */
+static struct IR *get_ir_device(struct IR *ir, bool ir_devices_lock_held)
+{
+	if (ir_devices_lock_held) {
+		kref_get(&ir->ref);
+	} else {
+		mutex_lock(&ir_devices_lock);
+		kref_get(&ir->ref);
+		mutex_unlock(&ir_devices_lock);
+	}
+	return ir;
+}
+
+static void release_ir_device(struct kref *ref)
+{
+	struct IR *ir = container_of(ref, struct IR, ref);
+
+	/*
+	 * Things should be in this state by now:
+	 * ir->rx set to NULL and deallocated - happens before ir->rx->ir put()
+	 * ir->rx->task kthread stopped - happens before ir->rx->ir put()
+	 * ir->tx set to NULL and deallocated - happens before ir->tx->ir put()
+	 * ir->open_count ==  0 - happens on final close()
+	 * ir_lock, tx_ref_lock, rx_ref_lock, all released
+	 */
+	if (ir->l.minor >= 0 && ir->l.minor < MAX_IRCTL_DEVICES) {
+		lirc_unregister_driver(ir->l.minor);
+		ir->l.minor = MAX_IRCTL_DEVICES;
+	}
+	if (kfifo_initialized(&ir->rbuf.fifo))
+		lirc_buffer_free(&ir->rbuf);
+	list_del(&ir->list);
+	kfree(ir);
+}
+
+static int put_ir_device(struct IR *ir, bool ir_devices_lock_held)
+{
+	int released;
+
+	if (ir_devices_lock_held)
+		return kref_put(&ir->ref, release_ir_device);
+
+	mutex_lock(&ir_devices_lock);
+	released = kref_put(&ir->ref, release_ir_device);
+	mutex_unlock(&ir_devices_lock);
+
+	return released;
+}
+
+/* struct IR_rx reference counting */
+static struct IR_rx *get_ir_rx(struct IR *ir)
+{
+	struct IR_rx *rx;
+
+	spin_lock(&ir->rx_ref_lock);
+	rx = ir->rx;
+	if (rx != NULL)
+		kref_get(&rx->ref);
+	spin_unlock(&ir->rx_ref_lock);
+	return rx;
+}
+
+static void destroy_rx_kthread(struct IR_rx *rx, bool ir_devices_lock_held)
+{
+	/* end up polling thread */
+	if (!IS_ERR_OR_NULL(rx->task)) {
+		kthread_stop(rx->task);
+		rx->task = NULL;
+		/* Put the ir ptr that ir_probe() gave to the rx poll thread */
+		put_ir_device(rx->ir, ir_devices_lock_held);
+	}
+}
+
+static void release_ir_rx(struct kref *ref)
+{
+	struct IR_rx *rx = container_of(ref, struct IR_rx, ref);
+	struct IR *ir = rx->ir;
+
+	/*
+	 * This release function can't do all the work, as we want
+	 * to keep the rx_ref_lock a spinlock, and killing the poll thread
+	 * and releasing the ir reference can cause a sleep.  That work is
+	 * performed by put_ir_rx()
+	 */
+	ir->l.features &= ~LIRC_CAN_REC_LIRCCODE;
+	/* Don't put_ir_device(rx->ir) here; lock can't be freed yet */
+	ir->rx = NULL;
+	/* Don't do the kfree(rx) here; we still need to kill the poll thread */
+}
+
+static int put_ir_rx(struct IR_rx *rx, bool ir_devices_lock_held)
+{
+	int released;
+	struct IR *ir = rx->ir;
+
+	spin_lock(&ir->rx_ref_lock);
+	released = kref_put(&rx->ref, release_ir_rx);
+	spin_unlock(&ir->rx_ref_lock);
+	/* Destroy the rx kthread while not holding the spinlock */
+	if (released) {
+		destroy_rx_kthread(rx, ir_devices_lock_held);
+		kfree(rx);
+		/* Make sure we're not still in a poll_table somewhere */
+		wake_up_interruptible(&ir->rbuf.wait_poll);
+	}
+	/* Do a reference put() for the rx->ir reference, if we released rx */
+	if (released)
+		put_ir_device(ir, ir_devices_lock_held);
+	return released;
+}
+
+/* struct IR_tx reference counting */
+static struct IR_tx *get_ir_tx(struct IR *ir)
+{
+	struct IR_tx *tx;
+
+	spin_lock(&ir->tx_ref_lock);
+	tx = ir->tx;
+	if (tx != NULL)
+		kref_get(&tx->ref);
+	spin_unlock(&ir->tx_ref_lock);
+	return tx;
+}
+
+static void release_ir_tx(struct kref *ref)
+{
+	struct IR_tx *tx = container_of(ref, struct IR_tx, ref);
+	struct IR *ir = tx->ir;
+
+	ir->l.features &= ~LIRC_CAN_SEND_PULSE;
+	/* Don't put_ir_device(tx->ir) here, so our lock doesn't get freed */
+	ir->tx = NULL;
+	kfree(tx);
+}
+
+static int put_ir_tx(struct IR_tx *tx, bool ir_devices_lock_held)
+{
+	int released;
+	struct IR *ir = tx->ir;
+
+	spin_lock(&ir->tx_ref_lock);
+	released = kref_put(&tx->ref, release_ir_tx);
+	spin_unlock(&ir->tx_ref_lock);
+	/* Do a reference put() for the tx->ir reference, if we released tx */
+	if (released)
+		put_ir_device(ir, ir_devices_lock_held);
+	return released;
+}
+
+static int add_to_buf(struct IR *ir)
+{
+	__u16 code;
+	unsigned char codes[2];
+	unsigned char keybuf[6];
+	int got_data = 0;
+	int ret;
+	int failures = 0;
+	unsigned char sendbuf[1] = { 0 };
+	struct lirc_buffer *rbuf = ir->l.rbuf;
+	struct IR_rx *rx;
+	struct IR_tx *tx;
+
+	if (lirc_buffer_full(rbuf)) {
+		dev_dbg(ir->l.dev, "buffer overflow\n");
+		return -EOVERFLOW;
+	}
+
+	rx = get_ir_rx(ir);
+	if (rx == NULL)
+		return -ENXIO;
+
+	/* Ensure our rx->c i2c_client remains valid for the duration */
+	mutex_lock(&rx->client_lock);
+	if (rx->c == NULL) {
+		mutex_unlock(&rx->client_lock);
+		put_ir_rx(rx, false);
+		return -ENXIO;
+	}
+
+	tx = get_ir_tx(ir);
+
+	/*
+	 * service the device as long as it is returning
+	 * data and we have space
+	 */
+	do {
+		if (kthread_should_stop()) {
+			ret = -ENODATA;
+			break;
+		}
+
+		/*
+		 * Lock i2c bus for the duration.  RX/TX chips interfere so
+		 * this is worth it
+		 */
+		mutex_lock(&ir->ir_lock);
+
+		if (kthread_should_stop()) {
+			mutex_unlock(&ir->ir_lock);
+			ret = -ENODATA;
+			break;
+		}
+
+		/*
+		 * Send random "poll command" (?)  Windows driver does this
+		 * and it is a good point to detect chip failure.
+		 */
+		ret = i2c_master_send(rx->c, sendbuf, 1);
+		if (ret != 1) {
+			dev_err(ir->l.dev, "i2c_master_send failed with %d\n",
+				ret);
+			if (failures >= 3) {
+				mutex_unlock(&ir->ir_lock);
+				dev_err(ir->l.dev,
+					"unable to read from the IR chip after 3 resets, giving up\n");
+				break;
+			}
+
+			/* Looks like the chip crashed, reset it */
+			dev_err(ir->l.dev,
+				"polling the IR receiver chip failed, trying reset\n");
+
+			set_current_state(TASK_UNINTERRUPTIBLE);
+			if (kthread_should_stop()) {
+				mutex_unlock(&ir->ir_lock);
+				ret = -ENODATA;
+				break;
+			}
+			schedule_timeout((100 * HZ + 999) / 1000);
+			if (tx != NULL)
+				tx->need_boot = 1;
+
+			++failures;
+			mutex_unlock(&ir->ir_lock);
+			ret = 0;
+			continue;
+		}
+
+		if (kthread_should_stop()) {
+			mutex_unlock(&ir->ir_lock);
+			ret = -ENODATA;
+			break;
+		}
+		ret = i2c_master_recv(rx->c, keybuf, sizeof(keybuf));
+		mutex_unlock(&ir->ir_lock);
+		if (ret != sizeof(keybuf)) {
+			dev_err(ir->l.dev,
+				"i2c_master_recv failed with %d -- keeping last read buffer\n",
+				ret);
+		} else {
+			rx->b[0] = keybuf[3];
+			rx->b[1] = keybuf[4];
+			rx->b[2] = keybuf[5];
+			dev_dbg(ir->l.dev,
+				"key (0x%02x/0x%02x)\n",
+				rx->b[0], rx->b[1]);
+		}
+
+		/* key pressed ? */
+		if (rx->hdpvr_data_fmt) {
+			if (got_data && (keybuf[0] == 0x80)) {
+				ret = 0;
+				break;
+			} else if (got_data && (keybuf[0] == 0x00)) {
+				ret = -ENODATA;
+				break;
+			}
+		} else if ((rx->b[0] & 0x80) == 0) {
+			ret = got_data ? 0 : -ENODATA;
+			break;
+		}
+
+		/* look what we have */
+		code = (((__u16)rx->b[0] & 0x7f) << 6) | (rx->b[1] >> 2);
+
+		codes[0] = (code >> 8) & 0xff;
+		codes[1] = code & 0xff;
+
+		/* return it */
+		lirc_buffer_write(rbuf, codes);
+		++got_data;
+		ret = 0;
+	} while (!lirc_buffer_full(rbuf));
+
+	mutex_unlock(&rx->client_lock);
+	if (tx != NULL)
+		put_ir_tx(tx, false);
+	put_ir_rx(rx, false);
+	return ret;
+}
+
+/*
+ * Main function of the polling thread -- from lirc_dev.
+ * We don't fit the LIRC model at all anymore.  This is horrible, but
+ * basically we have a single RX/TX device with a nasty failure mode
+ * that needs to be accounted for across the pair.  lirc lets us provide
+ * fops, but prevents us from using the internal polling, etc. if we do
+ * so.  Hence the replication.  Might be neater to extend the LIRC model
+ * to account for this but I'd think it's a very special case of seriously
+ * messed up hardware.
+ */
+static int lirc_thread(void *arg)
+{
+	struct IR *ir = arg;
+	struct lirc_buffer *rbuf = ir->l.rbuf;
+
+	dev_dbg(ir->l.dev, "poll thread started\n");
+
+	while (!kthread_should_stop()) {
+		set_current_state(TASK_INTERRUPTIBLE);
+
+		/* if device not opened, we can sleep half a second */
+		if (atomic_read(&ir->open_count) == 0) {
+			schedule_timeout(HZ/2);
+			continue;
+		}
+
+		/*
+		 * This is ~113*2 + 24 + jitter (2*repeat gap + code length).
+		 * We use this interval as the chip resets every time you poll
+		 * it (bad!).  This is therefore just sufficient to catch all
+		 * of the button presses.  It makes the remote much more
+		 * responsive.  You can see the difference by running irw and
+		 * holding down a button.  With 100ms, the old polling
+		 * interval, you'll notice breaks in the repeat sequence
+		 * corresponding to lost keypresses.
+		 */
+		schedule_timeout((260 * HZ) / 1000);
+		if (kthread_should_stop())
+			break;
+		if (!add_to_buf(ir))
+			wake_up_interruptible(&rbuf->wait_poll);
+	}
+
+	dev_dbg(ir->l.dev, "poll thread ended\n");
+	return 0;
+}
+
+static int set_use_inc(void *data)
+{
+	return 0;
+}
+
+static void set_use_dec(void *data)
+{
+}
+
+/* safe read of a uint32 (always network byte order) */
+static int read_uint32(unsigned char **data,
+				     unsigned char *endp, unsigned int *val)
+{
+	if (*data + 4 > endp)
+		return 0;
+	*val = ((*data)[0] << 24) | ((*data)[1] << 16) |
+	       ((*data)[2] << 8) | (*data)[3];
+	*data += 4;
+	return 1;
+}
+
+/* safe read of a uint8 */
+static int read_uint8(unsigned char **data,
+				    unsigned char *endp, unsigned char *val)
+{
+	if (*data + 1 > endp)
+		return 0;
+	*val = *((*data)++);
+	return 1;
+}
+
+/* safe skipping of N bytes */
+static int skip(unsigned char **data,
+			      unsigned char *endp, unsigned int distance)
+{
+	if (*data + distance > endp)
+		return 0;
+	*data += distance;
+	return 1;
+}
+
+/* decompress key data into the given buffer */
+static int get_key_data(unsigned char *buf,
+			     unsigned int codeset, unsigned int key)
+{
+	unsigned char *data, *endp, *diffs, *key_block;
+	unsigned char keys, ndiffs, id;
+	unsigned int base, lim, pos, i;
+
+	/* Binary search for the codeset */
+	for (base = 0, lim = tx_data->num_code_sets; lim; lim >>= 1) {
+		pos = base + (lim >> 1);
+		data = tx_data->code_sets[pos];
+
+		if (!read_uint32(&data, tx_data->endp, &i))
+			goto corrupt;
+
+		if (i == codeset)
+			break;
+		else if (codeset > i) {
+			base = pos + 1;
+			--lim;
+		}
+	}
+	/* Not found? */
+	if (!lim)
+		return -EPROTO;
+
+	/* Set end of data block */
+	endp = pos < tx_data->num_code_sets - 1 ?
+		tx_data->code_sets[pos + 1] : tx_data->endp;
+
+	/* Read the block header */
+	if (!read_uint8(&data, endp, &keys) ||
+	    !read_uint8(&data, endp, &ndiffs) ||
+	    ndiffs > TX_BLOCK_SIZE || keys == 0)
+		goto corrupt;
+
+	/* Save diffs & skip */
+	diffs = data;
+	if (!skip(&data, endp, ndiffs))
+		goto corrupt;
+
+	/* Read the id of the first key */
+	if (!read_uint8(&data, endp, &id))
+		goto corrupt;
+
+	/* Unpack the first key's data */
+	for (i = 0; i < TX_BLOCK_SIZE; ++i) {
+		if (tx_data->fixed[i] == -1) {
+			if (!read_uint8(&data, endp, &buf[i]))
+				goto corrupt;
+		} else {
+			buf[i] = (unsigned char)tx_data->fixed[i];
+		}
+	}
+
+	/* Early out key found/not found */
+	if (key == id)
+		return 0;
+	if (keys == 1)
+		return -EPROTO;
+
+	/* Sanity check */
+	key_block = data;
+	if (!skip(&data, endp, (keys - 1) * (ndiffs + 1)))
+		goto corrupt;
+
+	/* Binary search for the key */
+	for (base = 0, lim = keys - 1; lim; lim >>= 1) {
+		/* Seek to block */
+		unsigned char *key_data;
+
+		pos = base + (lim >> 1);
+		key_data = key_block + (ndiffs + 1) * pos;
+
+		if (*key_data == key) {
+			/* skip key id */
+			++key_data;
+
+			/* found, so unpack the diffs */
+			for (i = 0; i < ndiffs; ++i) {
+				unsigned char val;
+
+				if (!read_uint8(&key_data, endp, &val) ||
+				    diffs[i] >= TX_BLOCK_SIZE)
+					goto corrupt;
+				buf[diffs[i]] = val;
+			}
+
+			return 0;
+		} else if (key > *key_data) {
+			base = pos + 1;
+			--lim;
+		}
+	}
+	/* Key not found */
+	return -EPROTO;
+
+corrupt:
+	pr_err("firmware is corrupt\n");
+	return -EFAULT;
+}
+
+/* send a block of data to the IR TX device */
+static int send_data_block(struct IR_tx *tx, unsigned char *data_block)
+{
+	int i, j, ret;
+	unsigned char buf[5];
+
+	for (i = 0; i < TX_BLOCK_SIZE;) {
+		int tosend = TX_BLOCK_SIZE - i;
+
+		if (tosend > 4)
+			tosend = 4;
+		buf[0] = (unsigned char)(i + 1);
+		for (j = 0; j < tosend; ++j)
+			buf[1 + j] = data_block[i + j];
+		dev_dbg(tx->ir->l.dev, "%*ph", 5, buf);
+		ret = i2c_master_send(tx->c, buf, tosend + 1);
+		if (ret != tosend + 1) {
+			dev_err(tx->ir->l.dev,
+				"i2c_master_send failed with %d\n", ret);
+			return ret < 0 ? ret : -EFAULT;
+		}
+		i += tosend;
+	}
+	return 0;
+}
+
+/* send boot data to the IR TX device */
+static int send_boot_data(struct IR_tx *tx)
+{
+	int ret, i;
+	unsigned char buf[4];
+
+	/* send the boot block */
+	ret = send_data_block(tx, tx_data->boot_data);
+	if (ret != 0)
+		return ret;
+
+	/* Hit the go button to activate the new boot data */
+	buf[0] = 0x00;
+	buf[1] = 0x20;
+	ret = i2c_master_send(tx->c, buf, 2);
+	if (ret != 2) {
+		dev_err(tx->ir->l.dev, "i2c_master_send failed with %d\n", ret);
+		return ret < 0 ? ret : -EFAULT;
+	}
+
+	/*
+	 * Wait for zilog to settle after hitting go post boot block upload.
+	 * Without this delay, the HD-PVR and HVR-1950 both return an -EIO
+	 * upon attempting to get firmware revision, and tx probe thus fails.
+	 */
+	for (i = 0; i < 10; i++) {
+		ret = i2c_master_send(tx->c, buf, 1);
+		if (ret == 1)
+			break;
+		udelay(100);
+	}
+
+	if (ret != 1) {
+		dev_err(tx->ir->l.dev, "i2c_master_send failed with %d\n", ret);
+		return ret < 0 ? ret : -EFAULT;
+	}
+
+	/* Here comes the firmware version... (hopefully) */
+	ret = i2c_master_recv(tx->c, buf, 4);
+	if (ret != 4) {
+		dev_err(tx->ir->l.dev, "i2c_master_recv failed with %d\n", ret);
+		return 0;
+	}
+	if ((buf[0] != 0x80) && (buf[0] != 0xa0)) {
+		dev_err(tx->ir->l.dev, "unexpected IR TX init response: %02x\n",
+			buf[0]);
+		return 0;
+	}
+	dev_notice(tx->ir->l.dev,
+		   "Zilog/Hauppauge IR blaster firmware version %d.%d.%d loaded\n",
+		   buf[1], buf[2], buf[3]);
+
+	return 0;
+}
+
+/* unload "firmware", lock held */
+static void fw_unload_locked(void)
+{
+	if (tx_data) {
+		vfree(tx_data->code_sets);
+
+		vfree(tx_data->datap);
+
+		vfree(tx_data);
+		tx_data = NULL;
+		pr_debug("successfully unloaded IR blaster firmware\n");
+	}
+}
+
+/* unload "firmware" for the IR TX device */
+static void fw_unload(void)
+{
+	mutex_lock(&tx_data_lock);
+	fw_unload_locked();
+	mutex_unlock(&tx_data_lock);
+}
+
+/* load "firmware" for the IR TX device */
+static int fw_load(struct IR_tx *tx)
+{
+	int ret;
+	unsigned int i;
+	unsigned char *data, version, num_global_fixed;
+	const struct firmware *fw_entry;
+
+	/* Already loaded? */
+	mutex_lock(&tx_data_lock);
+	if (tx_data) {
+		ret = 0;
+		goto out;
+	}
+
+	/* Request codeset data file */
+	ret = reject_firmware(&fw_entry, "/*(DEBLOBBED)*/", tx->ir->l.dev);
+	if (ret != 0) {
+		dev_err(tx->ir->l.dev,
+			"firmware /*(DEBLOBBED)*/ not available (%d)\n",
+			ret);
+		ret = ret < 0 ? ret : -EFAULT;
+		goto out;
+	}
+	dev_dbg(tx->ir->l.dev, "firmware of size %zu loaded\n", fw_entry->size);
+
+	/* Parse the file */
+	tx_data = vmalloc(sizeof(*tx_data));
+	if (tx_data == NULL) {
+		release_firmware(fw_entry);
+		ret = -ENOMEM;
+		goto out;
+	}
+	tx_data->code_sets = NULL;
+
+	/* Copy the data so hotplug doesn't get confused and timeout */
+	tx_data->datap = vmalloc(fw_entry->size);
+	if (tx_data->datap == NULL) {
+		release_firmware(fw_entry);
+		vfree(tx_data);
+		ret = -ENOMEM;
+		goto out;
+	}
+	memcpy(tx_data->datap, fw_entry->data, fw_entry->size);
+	tx_data->endp = tx_data->datap + fw_entry->size;
+	release_firmware(fw_entry); fw_entry = NULL;
+
+	/* Check version */
+	data = tx_data->datap;
+	if (!read_uint8(&data, tx_data->endp, &version))
+		goto corrupt;
+	if (version != 1) {
+		dev_err(tx->ir->l.dev,
+			"unsupported code set file version (%u, expected 1) -- please upgrade to a newer driver\n",
+			version);
+		fw_unload_locked();
+		ret = -EFAULT;
+		goto out;
+	}
+
+	/* Save boot block for later */
+	tx_data->boot_data = data;
+	if (!skip(&data, tx_data->endp, TX_BLOCK_SIZE))
+		goto corrupt;
+
+	if (!read_uint32(&data, tx_data->endp,
+			      &tx_data->num_code_sets))
+		goto corrupt;
+
+	dev_dbg(tx->ir->l.dev, "%u IR blaster codesets loaded\n",
+		tx_data->num_code_sets);
+
+	tx_data->code_sets = vmalloc(
+		tx_data->num_code_sets * sizeof(char *));
+	if (tx_data->code_sets == NULL) {
+		fw_unload_locked();
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	for (i = 0; i < TX_BLOCK_SIZE; ++i)
+		tx_data->fixed[i] = -1;
+
+	/* Read global fixed data template */
+	if (!read_uint8(&data, tx_data->endp, &num_global_fixed) ||
+	    num_global_fixed > TX_BLOCK_SIZE)
+		goto corrupt;
+	for (i = 0; i < num_global_fixed; ++i) {
+		unsigned char pos, val;
+
+		if (!read_uint8(&data, tx_data->endp, &pos) ||
+		    !read_uint8(&data, tx_data->endp, &val) ||
+		    pos >= TX_BLOCK_SIZE)
+			goto corrupt;
+		tx_data->fixed[pos] = (int)val;
+	}
+
+	/* Filch out the position of each code set */
+	for (i = 0; i < tx_data->num_code_sets; ++i) {
+		unsigned int id;
+		unsigned char keys;
+		unsigned char ndiffs;
+
+		/* Save the codeset position */
+		tx_data->code_sets[i] = data;
+
+		/* Read header */
+		if (!read_uint32(&data, tx_data->endp, &id) ||
+		    !read_uint8(&data, tx_data->endp, &keys) ||
+		    !read_uint8(&data, tx_data->endp, &ndiffs) ||
+		    ndiffs > TX_BLOCK_SIZE || keys == 0)
+			goto corrupt;
+
+		/* skip diff positions */
+		if (!skip(&data, tx_data->endp, ndiffs))
+			goto corrupt;
+
+		/*
+		 * After the diffs we have the first key id + data -
+		 * global fixed
+		 */
+		if (!skip(&data, tx_data->endp,
+			       1 + TX_BLOCK_SIZE - num_global_fixed))
+			goto corrupt;
+
+		/* Then we have keys-1 blocks of key id+diffs */
+		if (!skip(&data, tx_data->endp,
+			       (ndiffs + 1) * (keys - 1)))
+			goto corrupt;
+	}
+	ret = 0;
+	goto out;
+
+corrupt:
+	dev_err(tx->ir->l.dev, "firmware is corrupt\n");
+	fw_unload_locked();
+	ret = -EFAULT;
+
+out:
+	mutex_unlock(&tx_data_lock);
+	return ret;
+}
+
+/* copied from lirc_dev */
+static ssize_t read(struct file *filep, char __user *outbuf, size_t n,
+		    loff_t *ppos)
+{
+	struct IR *ir = filep->private_data;
+	struct IR_rx *rx;
+	struct lirc_buffer *rbuf = ir->l.rbuf;
+	int ret = 0, written = 0, retries = 0;
+	unsigned int m;
+	DECLARE_WAITQUEUE(wait, current);
+
+	dev_dbg(ir->l.dev, "read called\n");
+	if (n % rbuf->chunk_size) {
+		dev_dbg(ir->l.dev, "read result = -EINVAL\n");
+		return -EINVAL;
+	}
+
+	rx = get_ir_rx(ir);
+	if (rx == NULL)
+		return -ENXIO;
+
+	/*
+	 * we add ourselves to the task queue before buffer check
+	 * to avoid losing scan code (in case when queue is awaken somewhere
+	 * between while condition checking and scheduling)
+	 */
+	add_wait_queue(&rbuf->wait_poll, &wait);
+	set_current_state(TASK_INTERRUPTIBLE);
+
+	/*
+	 * while we didn't provide 'length' bytes, device is opened in blocking
+	 * mode and 'copy_to_user' is happy, wait for data.
+	 */
+	while (written < n && ret == 0) {
+		if (lirc_buffer_empty(rbuf)) {
+			/*
+			 * According to the read(2) man page, 'written' can be
+			 * returned as less than 'n', instead of blocking
+			 * again, returning -EWOULDBLOCK, or returning
+			 * -ERESTARTSYS
+			 */
+			if (written)
+				break;
+			if (filep->f_flags & O_NONBLOCK) {
+				ret = -EWOULDBLOCK;
+				break;
+			}
+			if (signal_pending(current)) {
+				ret = -ERESTARTSYS;
+				break;
+			}
+			schedule();
+			set_current_state(TASK_INTERRUPTIBLE);
+		} else {
+			unsigned char buf[MAX_XFER_SIZE];
+
+			if (rbuf->chunk_size > sizeof(buf)) {
+				dev_err(ir->l.dev,
+					"chunk_size is too big (%d)!\n",
+					rbuf->chunk_size);
+				ret = -EINVAL;
+				break;
+			}
+			m = lirc_buffer_read(rbuf, buf);
+			if (m == rbuf->chunk_size) {
+				ret = copy_to_user(outbuf + written, buf,
+						   rbuf->chunk_size);
+				written += rbuf->chunk_size;
+			} else {
+				retries++;
+			}
+			if (retries >= 5) {
+				dev_err(ir->l.dev, "Buffer read failed!\n");
+				ret = -EIO;
+			}
+		}
+	}
+
+	remove_wait_queue(&rbuf->wait_poll, &wait);
+	put_ir_rx(rx, false);
+	set_current_state(TASK_RUNNING);
+
+	dev_dbg(ir->l.dev, "read result = %d (%s)\n", ret,
+		ret ? "Error" : "OK");
+
+	return ret ? ret : written;
+}
+
+/* send a keypress to the IR TX device */
+static int send_code(struct IR_tx *tx, unsigned int code, unsigned int key)
+{
+	unsigned char data_block[TX_BLOCK_SIZE];
+	unsigned char buf[2];
+	int i, ret;
+
+	/* Get data for the codeset/key */
+	ret = get_key_data(data_block, code, key);
+
+	if (ret == -EPROTO) {
+		dev_err(tx->ir->l.dev,
+			"failed to get data for code %u, key %u -- check lircd.conf entries\n",
+			code, key);
+		return ret;
+	} else if (ret != 0)
+		return ret;
+
+	/* Send the data block */
+	ret = send_data_block(tx, data_block);
+	if (ret != 0)
+		return ret;
+
+	/* Send data block length? */
+	buf[0] = 0x00;
+	buf[1] = 0x40;
+	ret = i2c_master_send(tx->c, buf, 2);
+	if (ret != 2) {
+		dev_err(tx->ir->l.dev, "i2c_master_send failed with %d\n", ret);
+		return ret < 0 ? ret : -EFAULT;
+	}
+
+	/* Give the z8 a moment to process data block */
+	for (i = 0; i < 10; i++) {
+		ret = i2c_master_send(tx->c, buf, 1);
+		if (ret == 1)
+			break;
+		udelay(100);
+	}
+
+	if (ret != 1) {
+		dev_err(tx->ir->l.dev, "i2c_master_send failed with %d\n", ret);
+		return ret < 0 ? ret : -EFAULT;
+	}
+
+	/* Send finished download? */
+	ret = i2c_master_recv(tx->c, buf, 1);
+	if (ret != 1) {
+		dev_err(tx->ir->l.dev, "i2c_master_recv failed with %d\n", ret);
+		return ret < 0 ? ret : -EFAULT;
+	}
+	if (buf[0] != 0xA0) {
+		dev_err(tx->ir->l.dev, "unexpected IR TX response #1: %02x\n",
+			buf[0]);
+		return -EFAULT;
+	}
+
+	/* Send prepare command? */
+	buf[0] = 0x00;
+	buf[1] = 0x80;
+	ret = i2c_master_send(tx->c, buf, 2);
+	if (ret != 2) {
+		dev_err(tx->ir->l.dev, "i2c_master_send failed with %d\n", ret);
+		return ret < 0 ? ret : -EFAULT;
+	}
+
+	/*
+	 * The sleep bits aren't necessary on the HD PVR, and in fact, the
+	 * last i2c_master_recv always fails with a -5, so for now, we're
+	 * going to skip this whole mess and say we're done on the HD PVR
+	 */
+	if (!tx->post_tx_ready_poll) {
+		dev_dbg(tx->ir->l.dev, "sent code %u, key %u\n", code, key);
+		return 0;
+	}
+
+	/*
+	 * This bit NAKs until the device is ready, so we retry it
+	 * sleeping a bit each time.  This seems to be what the windows
+	 * driver does, approximately.
+	 * Try for up to 1s.
+	 */
+	for (i = 0; i < 20; ++i) {
+		set_current_state(TASK_UNINTERRUPTIBLE);
+		schedule_timeout((50 * HZ + 999) / 1000);
+		ret = i2c_master_send(tx->c, buf, 1);
+		if (ret == 1)
+			break;
+		dev_dbg(tx->ir->l.dev,
+			"NAK expected: i2c_master_send failed with %d (try %d)\n",
+			ret, i+1);
+	}
+	if (ret != 1) {
+		dev_err(tx->ir->l.dev,
+			"IR TX chip never got ready: last i2c_master_send failed with %d\n",
+			ret);
+		return ret < 0 ? ret : -EFAULT;
+	}
+
+	/* Seems to be an 'ok' response */
+	i = i2c_master_recv(tx->c, buf, 1);
+	if (i != 1) {
+		dev_err(tx->ir->l.dev, "i2c_master_recv failed with %d\n", ret);
+		return -EFAULT;
+	}
+	if (buf[0] != 0x80) {
+		dev_err(tx->ir->l.dev, "unexpected IR TX response #2: %02x\n",
+			buf[0]);
+		return -EFAULT;
+	}
+
+	/* Oh good, it worked */
+	dev_dbg(tx->ir->l.dev, "sent code %u, key %u\n", code, key);
+	return 0;
+}
+
+/*
+ * Write a code to the device.  We take in a 32-bit number (an int) and then
+ * decode this to a codeset/key index.  The key data is then decompressed and
+ * sent to the device.  We have a spin lock as per i2c documentation to prevent
+ * multiple concurrent sends which would probably cause the device to explode.
+ */
+static ssize_t write(struct file *filep, const char __user *buf, size_t n,
+		     loff_t *ppos)
+{
+	struct IR *ir = filep->private_data;
+	struct IR_tx *tx;
+	size_t i;
+	int failures = 0;
+
+	/* Validate user parameters */
+	if (n % sizeof(int))
+		return -EINVAL;
+
+	/* Get a struct IR_tx reference */
+	tx = get_ir_tx(ir);
+	if (tx == NULL)
+		return -ENXIO;
+
+	/* Ensure our tx->c i2c_client remains valid for the duration */
+	mutex_lock(&tx->client_lock);
+	if (tx->c == NULL) {
+		mutex_unlock(&tx->client_lock);
+		put_ir_tx(tx, false);
+		return -ENXIO;
+	}
+
+	/* Lock i2c bus for the duration */
+	mutex_lock(&ir->ir_lock);
+
+	/* Send each keypress */
+	for (i = 0; i < n;) {
+		int ret = 0;
+		int command;
+
+		if (copy_from_user(&command, buf + i, sizeof(command))) {
+			mutex_unlock(&ir->ir_lock);
+			mutex_unlock(&tx->client_lock);
+			put_ir_tx(tx, false);
+			return -EFAULT;
+		}
+
+		/* Send boot data first if required */
+		if (tx->need_boot == 1) {
+			/* Make sure we have the 'firmware' loaded, first */
+			ret = fw_load(tx);
+			if (ret != 0) {
+				mutex_unlock(&ir->ir_lock);
+				mutex_unlock(&tx->client_lock);
+				put_ir_tx(tx, false);
+				if (ret != -ENOMEM)
+					ret = -EIO;
+				return ret;
+			}
+			/* Prep the chip for transmitting codes */
+			ret = send_boot_data(tx);
+			if (ret == 0)
+				tx->need_boot = 0;
+		}
+
+		/* Send the code */
+		if (ret == 0) {
+			ret = send_code(tx, (unsigned)command >> 16,
+					    (unsigned)command & 0xFFFF);
+			if (ret == -EPROTO) {
+				mutex_unlock(&ir->ir_lock);
+				mutex_unlock(&tx->client_lock);
+				put_ir_tx(tx, false);
+				return ret;
+			}
+		}
+
+		/*
+		 * Hmm, a failure.  If we've had a few then give up, otherwise
+		 * try a reset
+		 */
+		if (ret != 0) {
+			/* Looks like the chip crashed, reset it */
+			dev_err(tx->ir->l.dev,
+				"sending to the IR transmitter chip failed, trying reset\n");
+
+			if (failures >= 3) {
+				dev_err(tx->ir->l.dev,
+					"unable to send to the IR chip after 3 resets, giving up\n");
+				mutex_unlock(&ir->ir_lock);
+				mutex_unlock(&tx->client_lock);
+				put_ir_tx(tx, false);
+				return ret;
+			}
+			set_current_state(TASK_UNINTERRUPTIBLE);
+			schedule_timeout((100 * HZ + 999) / 1000);
+			tx->need_boot = 1;
+			++failures;
+		} else
+			i += sizeof(int);
+	}
+
+	/* Release i2c bus */
+	mutex_unlock(&ir->ir_lock);
+
+	mutex_unlock(&tx->client_lock);
+
+	/* Give back our struct IR_tx reference */
+	put_ir_tx(tx, false);
+
+	/* All looks good */
+	return n;
+}
+
+/* copied from lirc_dev */
+static unsigned int poll(struct file *filep, poll_table *wait)
+{
+	struct IR *ir = filep->private_data;
+	struct IR_rx *rx;
+	struct lirc_buffer *rbuf = ir->l.rbuf;
+	unsigned int ret;
+
+	dev_dbg(ir->l.dev, "poll called\n");
+
+	rx = get_ir_rx(ir);
+	if (rx == NULL) {
+		/*
+		 * Revisit this, if our poll function ever reports writeable
+		 * status for Tx
+		 */
+		dev_dbg(ir->l.dev, "poll result = POLLERR\n");
+		return POLLERR;
+	}
+
+	/*
+	 * Add our lirc_buffer's wait_queue to the poll_table. A wake up on
+	 * that buffer's wait queue indicates we may have a new poll status.
+	 */
+	poll_wait(filep, &rbuf->wait_poll, wait);
+
+	/* Indicate what ops could happen immediately without blocking */
+	ret = lirc_buffer_empty(rbuf) ? 0 : (POLLIN|POLLRDNORM);
+
+	dev_dbg(ir->l.dev, "poll result = %s\n",
+		ret ? "POLLIN|POLLRDNORM" : "none");
+	return ret;
+}
+
+static long ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
+{
+	struct IR *ir = filep->private_data;
+	unsigned long __user *uptr = (unsigned long __user *)arg;
+	int result;
+	unsigned long mode, features;
+
+	features = ir->l.features;
+
+	switch (cmd) {
+	case LIRC_GET_LENGTH:
+		result = put_user(13UL, uptr);
+		break;
+	case LIRC_GET_FEATURES:
+		result = put_user(features, uptr);
+		break;
+	case LIRC_GET_REC_MODE:
+		if (!(features&LIRC_CAN_REC_MASK))
+			return -ENOSYS;
+
+		result = put_user(LIRC_REC2MODE
+				  (features&LIRC_CAN_REC_MASK),
+				  uptr);
+		break;
+	case LIRC_SET_REC_MODE:
+		if (!(features&LIRC_CAN_REC_MASK))
+			return -ENOSYS;
+
+		result = get_user(mode, uptr);
+		if (!result && !(LIRC_MODE2REC(mode) & features))
+			result = -EINVAL;
+		break;
+	case LIRC_GET_SEND_MODE:
+		if (!(features&LIRC_CAN_SEND_MASK))
+			return -ENOSYS;
+
+		result = put_user(LIRC_MODE_PULSE, uptr);
+		break;
+	case LIRC_SET_SEND_MODE:
+		if (!(features&LIRC_CAN_SEND_MASK))
+			return -ENOSYS;
+
+		result = get_user(mode, uptr);
+		if (!result && mode != LIRC_MODE_PULSE)
+			return -EINVAL;
+		break;
+	default:
+		return -EINVAL;
+	}
+	return result;
+}
+
+static struct IR *get_ir_device_by_minor(unsigned int minor)
+{
+	struct IR *ir;
+	struct IR *ret = NULL;
+
+	mutex_lock(&ir_devices_lock);
+
+	if (!list_empty(&ir_devices_list)) {
+		list_for_each_entry(ir, &ir_devices_list, list) {
+			if (ir->l.minor == minor) {
+				ret = get_ir_device(ir, true);
+				break;
+			}
+		}
+	}
+
+	mutex_unlock(&ir_devices_lock);
+	return ret;
+}
+
+/*
+ * Open the IR device.  Get hold of our IR structure and
+ * stash it in private_data for the file
+ */
+static int open(struct inode *node, struct file *filep)
+{
+	struct IR *ir;
+	unsigned int minor = MINOR(node->i_rdev);
+
+	/* find our IR struct */
+	ir = get_ir_device_by_minor(minor);
+
+	if (ir == NULL)
+		return -ENODEV;
+
+	atomic_inc(&ir->open_count);
+
+	/* stash our IR struct */
+	filep->private_data = ir;
+
+	nonseekable_open(node, filep);
+	return 0;
+}
+
+/* Close the IR device */
+static int close(struct inode *node, struct file *filep)
+{
+	/* find our IR struct */
+	struct IR *ir = filep->private_data;
+
+	if (ir == NULL) {
+		pr_err("ir: close: no private_data attached to the file!\n");
+		return -ENODEV;
+	}
+
+	atomic_dec(&ir->open_count);
+
+	put_ir_device(ir, false);
+	return 0;
+}
+
+static int ir_remove(struct i2c_client *client);
+static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id);
+
+#define ID_FLAG_TX	0x01
+#define ID_FLAG_HDPVR	0x02
+
+static const struct i2c_device_id ir_transceiver_id[] = {
+	{ "ir_tx_z8f0811_haup",  ID_FLAG_TX                 },
+	{ "ir_rx_z8f0811_haup",  0                          },
+	{ "ir_tx_z8f0811_hdpvr", ID_FLAG_HDPVR | ID_FLAG_TX },
+	{ "ir_rx_z8f0811_hdpvr", ID_FLAG_HDPVR              },
+	{ }
+};
+
+static struct i2c_driver driver = {
+	.driver = {
+		.owner	= THIS_MODULE,
+		.name	= "Zilog/Hauppauge i2c IR",
+	},
+	.probe		= ir_probe,
+	.remove		= ir_remove,
+	.id_table	= ir_transceiver_id,
+};
+
+static const struct file_operations lirc_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.read		= read,
+	.write		= write,
+	.poll		= poll,
+	.unlocked_ioctl	= ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl	= ioctl,
+#endif
+	.open		= open,
+	.release	= close
+};
+
+static struct lirc_driver lirc_template = {
+	.name		= "lirc_zilog",
+	.minor		= -1,
+	.code_length	= 13,
+	.buffer_size	= BUFLEN / 2,
+	.sample_rate	= 0, /* tell lirc_dev to not start its own kthread */
+	.chunk_size	= 2,
+	.set_use_inc	= set_use_inc,
+	.set_use_dec	= set_use_dec,
+	.fops		= &lirc_fops,
+	.owner		= THIS_MODULE,
+};
+
+static int ir_remove(struct i2c_client *client)
+{
+	if (strncmp("ir_tx_z8", client->name, 8) == 0) {
+		struct IR_tx *tx = i2c_get_clientdata(client);
+
+		if (tx != NULL) {
+			mutex_lock(&tx->client_lock);
+			tx->c = NULL;
+			mutex_unlock(&tx->client_lock);
+			put_ir_tx(tx, false);
+		}
+	} else if (strncmp("ir_rx_z8", client->name, 8) == 0) {
+		struct IR_rx *rx = i2c_get_clientdata(client);
+
+		if (rx != NULL) {
+			mutex_lock(&rx->client_lock);
+			rx->c = NULL;
+			mutex_unlock(&rx->client_lock);
+			put_ir_rx(rx, false);
+		}
+	}
+	return 0;
+}
+
+
+/* ir_devices_lock must be held */
+static struct IR *get_ir_device_by_adapter(struct i2c_adapter *adapter)
+{
+	struct IR *ir;
+
+	if (list_empty(&ir_devices_list))
+		return NULL;
+
+	list_for_each_entry(ir, &ir_devices_list, list)
+		if (ir->adapter == adapter) {
+			get_ir_device(ir, true);
+			return ir;
+		}
+
+	return NULL;
+}
+
+static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+	struct IR *ir;
+	struct IR_tx *tx;
+	struct IR_rx *rx;
+	struct i2c_adapter *adap = client->adapter;
+	int ret;
+	bool tx_probe = false;
+
+	dev_dbg(&client->dev, "%s: %s on i2c-%d (%s), client addr=0x%02x\n",
+		__func__, id->name, adap->nr, adap->name, client->addr);
+
+	/*
+	 * The IR receiver    is at i2c address 0x71.
+	 * The IR transmitter is at i2c address 0x70.
+	 */
+
+	if (id->driver_data & ID_FLAG_TX)
+		tx_probe = true;
+	else if (tx_only) /* module option */
+		return -ENXIO;
+
+	pr_info("probing IR %s on %s (i2c-%d)\n",
+		   tx_probe ? "Tx" : "Rx", adap->name, adap->nr);
+
+	mutex_lock(&ir_devices_lock);
+
+	/* Use a single struct IR instance for both the Rx and Tx functions */
+	ir = get_ir_device_by_adapter(adap);
+	if (ir == NULL) {
+		ir = kzalloc(sizeof(struct IR), GFP_KERNEL);
+		if (ir == NULL) {
+			ret = -ENOMEM;
+			goto out_no_ir;
+		}
+		kref_init(&ir->ref);
+
+		/* store for use in ir_probe() again, and open() later on */
+		INIT_LIST_HEAD(&ir->list);
+		list_add_tail(&ir->list, &ir_devices_list);
+
+		ir->adapter = adap;
+		mutex_init(&ir->ir_lock);
+		atomic_set(&ir->open_count, 0);
+		spin_lock_init(&ir->tx_ref_lock);
+		spin_lock_init(&ir->rx_ref_lock);
+
+		/* set lirc_dev stuff */
+		memcpy(&ir->l, &lirc_template, sizeof(struct lirc_driver));
+		/*
+		 * FIXME this is a pointer reference to us, but no refcount.
+		 *
+		 * This OK for now, since lirc_dev currently won't touch this
+		 * buffer as we provide our own lirc_fops.
+		 *
+		 * Currently our own lirc_fops rely on this ir->l.rbuf pointer
+		 */
+		ir->l.rbuf = &ir->rbuf;
+		ir->l.dev  = &adap->dev;
+		ret = lirc_buffer_init(ir->l.rbuf,
+				       ir->l.chunk_size, ir->l.buffer_size);
+		if (ret)
+			goto out_put_ir;
+	}
+
+	if (tx_probe) {
+		/* Get the IR_rx instance for later, if already allocated */
+		rx = get_ir_rx(ir);
+
+		/* Set up a struct IR_tx instance */
+		tx = kzalloc(sizeof(struct IR_tx), GFP_KERNEL);
+		if (tx == NULL) {
+			ret = -ENOMEM;
+			goto out_put_xx;
+		}
+		kref_init(&tx->ref);
+		ir->tx = tx;
+
+		ir->l.features |= LIRC_CAN_SEND_PULSE;
+		mutex_init(&tx->client_lock);
+		tx->c = client;
+		tx->need_boot = 1;
+		tx->post_tx_ready_poll =
+			       (id->driver_data & ID_FLAG_HDPVR) ? false : true;
+
+		/* An ir ref goes to the struct IR_tx instance */
+		tx->ir = get_ir_device(ir, true);
+
+		/* A tx ref goes to the i2c_client */
+		i2c_set_clientdata(client, get_ir_tx(ir));
+
+		/*
+		 * Load the 'firmware'.  We do this before registering with
+		 * lirc_dev, so the first firmware load attempt does not happen
+		 * after a open() or write() call on the device.
+		 *
+		 * Failure here is not deemed catastrophic, so the receiver will
+		 * still be usable.  Firmware load will be retried in write(),
+		 * if it is needed.
+		 */
+		fw_load(tx);
+
+		/* Proceed only if the Rx client is also ready or not needed */
+		if (rx == NULL && !tx_only) {
+			dev_info(tx->ir->l.dev,
+				 "probe of IR Tx on %s (i2c-%d) done. Waiting on IR Rx.\n",
+				 adap->name, adap->nr);
+			goto out_ok;
+		}
+	} else {
+		/* Get the IR_tx instance for later, if already allocated */
+		tx = get_ir_tx(ir);
+
+		/* Set up a struct IR_rx instance */
+		rx = kzalloc(sizeof(struct IR_rx), GFP_KERNEL);
+		if (rx == NULL) {
+			ret = -ENOMEM;
+			goto out_put_xx;
+		}
+		kref_init(&rx->ref);
+		ir->rx = rx;
+
+		ir->l.features |= LIRC_CAN_REC_LIRCCODE;
+		mutex_init(&rx->client_lock);
+		rx->c = client;
+		rx->hdpvr_data_fmt =
+			       (id->driver_data & ID_FLAG_HDPVR) ? true : false;
+
+		/* An ir ref goes to the struct IR_rx instance */
+		rx->ir = get_ir_device(ir, true);
+
+		/* An rx ref goes to the i2c_client */
+		i2c_set_clientdata(client, get_ir_rx(ir));
+
+		/*
+		 * Start the polling thread.
+		 * It will only perform an empty loop around schedule_timeout()
+		 * until we register with lirc_dev and the first user open()
+		 */
+		/* An ir ref goes to the new rx polling kthread */
+		rx->task = kthread_run(lirc_thread, get_ir_device(ir, true),
+				       "zilog-rx-i2c-%d", adap->nr);
+		if (IS_ERR(rx->task)) {
+			ret = PTR_ERR(rx->task);
+			dev_err(tx->ir->l.dev,
+				"%s: could not start IR Rx polling thread\n",
+				__func__);
+			/* Failed kthread, so put back the ir ref */
+			put_ir_device(ir, true);
+			/* Failure exit, so put back rx ref from i2c_client */
+			i2c_set_clientdata(client, NULL);
+			put_ir_rx(rx, true);
+			ir->l.features &= ~LIRC_CAN_REC_LIRCCODE;
+			goto out_put_xx;
+		}
+
+		/* Proceed only if the Tx client is also ready */
+		if (tx == NULL) {
+			pr_info("probe of IR Rx on %s (i2c-%d) done. Waiting on IR Tx.\n",
+				   adap->name, adap->nr);
+			goto out_ok;
+		}
+	}
+
+	/* register with lirc */
+	ir->l.minor = minor; /* module option: user requested minor number */
+	ir->l.minor = lirc_register_driver(&ir->l);
+	if (ir->l.minor < 0 || ir->l.minor >= MAX_IRCTL_DEVICES) {
+		dev_err(tx->ir->l.dev,
+			"%s: \"minor\" must be between 0 and %d (%d)!\n",
+			__func__, MAX_IRCTL_DEVICES-1, ir->l.minor);
+		ret = -EBADRQC;
+		goto out_put_xx;
+	}
+	dev_info(ir->l.dev,
+		 "IR unit on %s (i2c-%d) registered as lirc%d and ready\n",
+		 adap->name, adap->nr, ir->l.minor);
+
+out_ok:
+	if (rx != NULL)
+		put_ir_rx(rx, true);
+	if (tx != NULL)
+		put_ir_tx(tx, true);
+	put_ir_device(ir, true);
+	dev_info(ir->l.dev,
+		 "probe of IR %s on %s (i2c-%d) done\n",
+		 tx_probe ? "Tx" : "Rx", adap->name, adap->nr);
+	mutex_unlock(&ir_devices_lock);
+	return 0;
+
+out_put_xx:
+	if (rx != NULL)
+		put_ir_rx(rx, true);
+	if (tx != NULL)
+		put_ir_tx(tx, true);
+out_put_ir:
+	put_ir_device(ir, true);
+out_no_ir:
+	dev_err(&client->dev,
+		"%s: probing IR %s on %s (i2c-%d) failed with %d\n",
+		__func__, tx_probe ? "Tx" : "Rx", adap->name, adap->nr, ret);
+	mutex_unlock(&ir_devices_lock);
+	return ret;
+}
+
+static int __init zilog_init(void)
+{
+	int ret;
+
+	pr_notice("Zilog/Hauppauge IR driver initializing\n");
+
+	mutex_init(&tx_data_lock);
+
+	request_module("firmware_class");
+
+	ret = i2c_add_driver(&driver);
+	if (ret)
+		pr_err("initialization failed\n");
+	else
+		pr_notice("initialization complete\n");
+
+	return ret;
+}
+
+static void __exit zilog_exit(void)
+{
+	i2c_del_driver(&driver);
+	/* if loaded */
+	fw_unload();
+	pr_notice("Zilog/Hauppauge IR driver unloaded\n");
+}
+
+module_init(zilog_init);
+module_exit(zilog_exit);
+
+MODULE_DESCRIPTION("Zilog/Hauppauge infrared transmitter driver (i2c stack)");
+MODULE_AUTHOR("Gerd Knorr, Michal Kochanowicz, Christoph Bartelmus, "
+	      "Ulrich Mueller, Stefan Jahn, Jerome Brock, Mark Weaver, "
+	      "Andy Walls");
+MODULE_LICENSE("GPL");
+/* for compat with old name, which isn't all that accurate anymore */
+MODULE_ALIAS("lirc_pvr150");
+
+module_param(minor, int, 0444);
+MODULE_PARM_DESC(minor, "Preferred minor device number");
+
+module_param(debug, bool, 0644);
+MODULE_PARM_DESC(debug, "Enable debugging messages");
+
+module_param(tx_only, bool, 0644);
+MODULE_PARM_DESC(tx_only, "Only handle the IR transmit function");