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-rw-r--r--drivers/input/serio/Kconfig14
-rw-r--r--drivers/input/serio/Makefile1
-rw-r--r--drivers/input/serio/i8042.c32
-rw-r--r--drivers/input/serio/parkbd.c58
-rw-r--r--drivers/input/serio/userio.c285
5 files changed, 366 insertions, 24 deletions
diff --git a/drivers/input/serio/Kconfig b/drivers/input/serio/Kconfig
index 200841b77..c3d05b4d3 100644
--- a/drivers/input/serio/Kconfig
+++ b/drivers/input/serio/Kconfig
@@ -292,4 +292,18 @@ config SERIO_SUN4I_PS2
To compile this driver as a module, choose M here: the
module will be called sun4i-ps2.
+config USERIO
+ tristate "User space serio port driver support"
+ help
+ Say Y here if you want to support user level drivers for serio
+ subsystem accessible under char device 10:240 - /dev/userio. Using
+ this facility userspace programs can implement serio ports that
+ will be used by the standard in-kernel serio consumer drivers,
+ such as psmouse and atkbd.
+
+ To compile this driver as a module, choose M here: the module will be
+ called userio.
+
+ If you are unsure, say N.
+
endif
diff --git a/drivers/input/serio/Makefile b/drivers/input/serio/Makefile
index c600089b7..2374ef9b3 100644
--- a/drivers/input/serio/Makefile
+++ b/drivers/input/serio/Makefile
@@ -30,3 +30,4 @@ obj-$(CONFIG_SERIO_APBPS2) += apbps2.o
obj-$(CONFIG_SERIO_OLPC_APSP) += olpc_apsp.o
obj-$(CONFIG_HYPERV_KEYBOARD) += hyperv-keyboard.o
obj-$(CONFIG_SERIO_SUN4I_PS2) += sun4i-ps2.o
+obj-$(CONFIG_USERIO) += userio.o
diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
index db91de539..454195709 100644
--- a/drivers/input/serio/i8042.c
+++ b/drivers/input/serio/i8042.c
@@ -24,6 +24,7 @@
#include <linux/platform_device.h>
#include <linux/i8042.h>
#include <linux/slab.h>
+#include <linux/suspend.h>
#include <asm/io.h>
@@ -1170,7 +1171,8 @@ static int i8042_pm_suspend(struct device *dev)
{
int i;
- i8042_controller_reset(true);
+ if (pm_suspend_via_firmware())
+ i8042_controller_reset(true);
/* Set up serio interrupts for system wakeup. */
for (i = 0; i < I8042_NUM_PORTS; i++) {
@@ -1183,8 +1185,17 @@ static int i8042_pm_suspend(struct device *dev)
return 0;
}
+static int i8042_pm_resume_noirq(struct device *dev)
+{
+ if (!pm_resume_via_firmware())
+ i8042_interrupt(0, NULL);
+
+ return 0;
+}
+
static int i8042_pm_resume(struct device *dev)
{
+ bool force_reset;
int i;
for (i = 0; i < I8042_NUM_PORTS; i++) {
@@ -1195,11 +1206,21 @@ static int i8042_pm_resume(struct device *dev)
}
/*
- * On resume from S2R we always try to reset the controller
- * to bring it in a sane state. (In case of S2D we expect
- * BIOS to reset the controller for us.)
+ * If platform firmware was not going to be involved in suspend, we did
+ * not restore the controller state to whatever it had been at boot
+ * time, so we do not need to do anything.
*/
- return i8042_controller_resume(true);
+ if (!pm_suspend_via_firmware())
+ return 0;
+
+ /*
+ * We only need to reset the controller if we are resuming after handing
+ * off control to the platform firmware, otherwise we can simply restore
+ * the mode.
+ */
+ force_reset = pm_resume_via_firmware();
+
+ return i8042_controller_resume(force_reset);
}
static int i8042_pm_thaw(struct device *dev)
@@ -1223,6 +1244,7 @@ static int i8042_pm_restore(struct device *dev)
static const struct dev_pm_ops i8042_pm_ops = {
.suspend = i8042_pm_suspend,
+ .resume_noirq = i8042_pm_resume_noirq,
.resume = i8042_pm_resume,
.thaw = i8042_pm_thaw,
.poweroff = i8042_pm_reset,
diff --git a/drivers/input/serio/parkbd.c b/drivers/input/serio/parkbd.c
index 1e8cd6f1f..1edfac78d 100644
--- a/drivers/input/serio/parkbd.c
+++ b/drivers/input/serio/parkbd.c
@@ -141,19 +141,16 @@ static void parkbd_interrupt(void *dev_id)
parkbd_last = jiffies;
}
-static int parkbd_getport(void)
+static int parkbd_getport(struct parport *pp)
{
- struct parport *pp;
+ struct pardev_cb parkbd_parport_cb;
- pp = parport_find_number(parkbd_pp_no);
+ memset(&parkbd_parport_cb, 0, sizeof(parkbd_parport_cb));
+ parkbd_parport_cb.irq_func = parkbd_interrupt;
+ parkbd_parport_cb.flags = PARPORT_FLAG_EXCL;
- if (pp == NULL) {
- printk(KERN_ERR "parkbd: no such parport\n");
- return -ENODEV;
- }
-
- parkbd_dev = parport_register_device(pp, "parkbd", NULL, NULL, parkbd_interrupt, PARPORT_DEV_EXCL, NULL);
- parport_put_port(pp);
+ parkbd_dev = parport_register_dev_model(pp, "parkbd",
+ &parkbd_parport_cb, 0);
if (!parkbd_dev)
return -ENODEV;
@@ -168,7 +165,7 @@ static int parkbd_getport(void)
return 0;
}
-static struct serio * __init parkbd_allocate_serio(void)
+static struct serio *parkbd_allocate_serio(void)
{
struct serio *serio;
@@ -183,19 +180,21 @@ static struct serio * __init parkbd_allocate_serio(void)
return serio;
}
-static int __init parkbd_init(void)
+static void parkbd_attach(struct parport *pp)
{
- int err;
+ if (pp->number != parkbd_pp_no) {
+ pr_debug("Not using parport%d.\n", pp->number);
+ return;
+ }
- err = parkbd_getport();
- if (err)
- return err;
+ if (parkbd_getport(pp))
+ return;
parkbd_port = parkbd_allocate_serio();
if (!parkbd_port) {
parport_release(parkbd_dev);
parport_unregister_device(parkbd_dev);
- return -ENOMEM;
+ return;
}
parkbd_writelines(3);
@@ -205,14 +204,35 @@ static int __init parkbd_init(void)
printk(KERN_INFO "serio: PARKBD %s adapter on %s\n",
parkbd_mode ? "AT" : "XT", parkbd_dev->port->name);
- return 0;
+ return;
}
-static void __exit parkbd_exit(void)
+static void parkbd_detach(struct parport *port)
{
+ if (!parkbd_port || port->number != parkbd_pp_no)
+ return;
+
parport_release(parkbd_dev);
serio_unregister_port(parkbd_port);
parport_unregister_device(parkbd_dev);
+ parkbd_port = NULL;
+}
+
+static struct parport_driver parkbd_parport_driver = {
+ .name = "parkbd",
+ .match_port = parkbd_attach,
+ .detach = parkbd_detach,
+ .devmodel = true,
+};
+
+static int __init parkbd_init(void)
+{
+ return parport_register_driver(&parkbd_parport_driver);
+}
+
+static void __exit parkbd_exit(void)
+{
+ parport_unregister_driver(&parkbd_parport_driver);
}
module_init(parkbd_init);
diff --git a/drivers/input/serio/userio.c b/drivers/input/serio/userio.c
new file mode 100644
index 000000000..df1fd4186
--- /dev/null
+++ b/drivers/input/serio/userio.c
@@ -0,0 +1,285 @@
+/*
+ * userio kernel serio device emulation module
+ * Copyright (C) 2015 Red Hat
+ * Copyright (C) 2015 Stephen Chandler Paul <thatslyude@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser 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 Lesser
+ * General Public License for more details.
+ */
+
+#include <linux/circ_buf.h>
+#include <linux/mutex.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/serio.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/sched.h>
+#include <linux/poll.h>
+#include <uapi/linux/userio.h>
+
+#define USERIO_NAME "userio"
+#define USERIO_BUFSIZE 16
+
+static struct miscdevice userio_misc;
+
+struct userio_device {
+ struct serio *serio;
+ struct mutex mutex;
+
+ bool running;
+
+ u8 head;
+ u8 tail;
+
+ spinlock_t buf_lock;
+ unsigned char buf[USERIO_BUFSIZE];
+
+ wait_queue_head_t waitq;
+};
+
+/**
+ * userio_device_write - Write data from serio to a userio device in userspace
+ * @id: The serio port for the userio device
+ * @val: The data to write to the device
+ */
+static int userio_device_write(struct serio *id, unsigned char val)
+{
+ struct userio_device *userio = id->port_data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&userio->buf_lock, flags);
+
+ userio->buf[userio->head] = val;
+ userio->head = (userio->head + 1) % USERIO_BUFSIZE;
+
+ if (userio->head == userio->tail)
+ dev_warn(userio_misc.this_device,
+ "Buffer overflowed, userio client isn't keeping up");
+
+ spin_unlock_irqrestore(&userio->buf_lock, flags);
+
+ wake_up_interruptible(&userio->waitq);
+
+ return 0;
+}
+
+static int userio_char_open(struct inode *inode, struct file *file)
+{
+ struct userio_device *userio;
+
+ userio = kzalloc(sizeof(struct userio_device), GFP_KERNEL);
+ if (!userio)
+ return -ENOMEM;
+
+ mutex_init(&userio->mutex);
+ spin_lock_init(&userio->buf_lock);
+ init_waitqueue_head(&userio->waitq);
+
+ userio->serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
+ if (!userio->serio) {
+ kfree(userio);
+ return -ENOMEM;
+ }
+
+ userio->serio->write = userio_device_write;
+ userio->serio->port_data = userio;
+
+ file->private_data = userio;
+
+ return 0;
+}
+
+static int userio_char_release(struct inode *inode, struct file *file)
+{
+ struct userio_device *userio = file->private_data;
+
+ if (userio->running) {
+ /*
+ * Don't free the serio port here, serio_unregister_port()
+ * does it for us.
+ */
+ serio_unregister_port(userio->serio);
+ } else {
+ kfree(userio->serio);
+ }
+
+ kfree(userio);
+
+ return 0;
+}
+
+static ssize_t userio_char_read(struct file *file, char __user *user_buffer,
+ size_t count, loff_t *ppos)
+{
+ struct userio_device *userio = file->private_data;
+ int error;
+ size_t nonwrap_len, copylen;
+ unsigned char buf[USERIO_BUFSIZE];
+ unsigned long flags;
+
+ /*
+ * By the time we get here, the data that was waiting might have
+ * been taken by another thread. Grab the buffer lock and check if
+ * there's still any data waiting, otherwise repeat this process
+ * until we have data (unless the file descriptor is non-blocking
+ * of course).
+ */
+ for (;;) {
+ spin_lock_irqsave(&userio->buf_lock, flags);
+
+ nonwrap_len = CIRC_CNT_TO_END(userio->head,
+ userio->tail,
+ USERIO_BUFSIZE);
+ copylen = min(nonwrap_len, count);
+ if (copylen) {
+ memcpy(buf, &userio->buf[userio->tail], copylen);
+ userio->tail = (userio->tail + copylen) %
+ USERIO_BUFSIZE;
+ }
+
+ spin_unlock_irqrestore(&userio->buf_lock, flags);
+
+ if (nonwrap_len)
+ break;
+
+ /* buffer was/is empty */
+ if (file->f_flags & O_NONBLOCK)
+ return -EAGAIN;
+
+ /*
+ * count == 0 is special - no IO is done but we check
+ * for error conditions (see above).
+ */
+ if (count == 0)
+ return 0;
+
+ error = wait_event_interruptible(userio->waitq,
+ userio->head != userio->tail);
+ if (error)
+ return error;
+ }
+
+ if (copylen)
+ if (copy_to_user(user_buffer, buf, copylen))
+ return -EFAULT;
+
+ return copylen;
+}
+
+static ssize_t userio_char_write(struct file *file, const char __user *buffer,
+ size_t count, loff_t *ppos)
+{
+ struct userio_device *userio = file->private_data;
+ struct userio_cmd cmd;
+ int error;
+
+ if (count != sizeof(cmd)) {
+ dev_warn(userio_misc.this_device, "Invalid payload size\n");
+ return -EINVAL;
+ }
+
+ if (copy_from_user(&cmd, buffer, sizeof(cmd)))
+ return -EFAULT;
+
+ error = mutex_lock_interruptible(&userio->mutex);
+ if (error)
+ return error;
+
+ switch (cmd.type) {
+ case USERIO_CMD_REGISTER:
+ if (!userio->serio->id.type) {
+ dev_warn(userio_misc.this_device,
+ "No port type given on /dev/userio\n");
+
+ error = -EINVAL;
+ goto out;
+ }
+
+ if (userio->running) {
+ dev_warn(userio_misc.this_device,
+ "Begin command sent, but we're already running\n");
+ error = -EBUSY;
+ goto out;
+ }
+
+ userio->running = true;
+ serio_register_port(userio->serio);
+ break;
+
+ case USERIO_CMD_SET_PORT_TYPE:
+ if (userio->running) {
+ dev_warn(userio_misc.this_device,
+ "Can't change port type on an already running userio instance\n");
+ error = -EBUSY;
+ goto out;
+ }
+
+ userio->serio->id.type = cmd.data;
+ break;
+
+ case USERIO_CMD_SEND_INTERRUPT:
+ if (!userio->running) {
+ dev_warn(userio_misc.this_device,
+ "The device must be registered before sending interrupts\n");
+ error = -ENODEV;
+ goto out;
+ }
+
+ serio_interrupt(userio->serio, cmd.data, 0);
+ break;
+
+ default:
+ error = -EOPNOTSUPP;
+ goto out;
+ }
+
+out:
+ mutex_unlock(&userio->mutex);
+ return error ?: count;
+}
+
+static unsigned int userio_char_poll(struct file *file, poll_table *wait)
+{
+ struct userio_device *userio = file->private_data;
+
+ poll_wait(file, &userio->waitq, wait);
+
+ if (userio->head != userio->tail)
+ return POLLIN | POLLRDNORM;
+
+ return 0;
+}
+
+static const struct file_operations userio_fops = {
+ .owner = THIS_MODULE,
+ .open = userio_char_open,
+ .release = userio_char_release,
+ .read = userio_char_read,
+ .write = userio_char_write,
+ .poll = userio_char_poll,
+ .llseek = no_llseek,
+};
+
+static struct miscdevice userio_misc = {
+ .fops = &userio_fops,
+ .minor = USERIO_MINOR,
+ .name = USERIO_NAME,
+};
+module_driver(userio_misc, misc_register, misc_deregister);
+
+MODULE_ALIAS_MISCDEV(USERIO_MINOR);
+MODULE_ALIAS("devname:" USERIO_NAME);
+
+MODULE_AUTHOR("Stephen Chandler Paul <thatslyude@gmail.com>");
+MODULE_DESCRIPTION("Virtual Serio Device Support");
+MODULE_LICENSE("GPL");