Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 1110 insertions, 0 deletions

diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
new file mode 100644
index 00000000..a9374387
--- /dev/null
+++ b/drivers/input/evdev.c
@@ -0,0 +1,1110 @@
+/*
+ * Event char devices, giving access to raw input device events.
+ *
+ * Copyright (c) 1999-2002 Vojtech Pavlik
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#define EVDEV_MINOR_BASE	64
+#define EVDEV_MINORS		32
+#define EVDEV_MIN_BUFFER_SIZE	64U
+#define EVDEV_BUF_PACKETS	8
+
+#include <linux/poll.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/input/mt.h>
+#include <linux/major.h>
+#include <linux/device.h>
+#include <linux/wakelock.h>
+#include "input-compat.h"
+
+struct evdev {
+	int open;
+	int minor;
+	struct input_handle handle;
+	wait_queue_head_t wait;
+	struct evdev_client __rcu *grab;
+	struct list_head client_list;
+	spinlock_t client_lock; /* protects client_list */
+	struct mutex mutex;
+	struct device dev;
+	bool exist;
+};
+
+struct evdev_client {
+	unsigned int head;
+	unsigned int tail;
+	unsigned int packet_head; /* [future] position of the first element of next packet */
+	spinlock_t buffer_lock; /* protects access to buffer, head and tail */
+	struct wake_lock wake_lock;
+	bool use_wake_lock;
+	char name[28];
+	struct fasync_struct *fasync;
+	struct evdev *evdev;
+	struct list_head node;
+	int clkid;
+	unsigned int bufsize;
+	struct input_event buffer[];
+};
+
+static struct evdev *evdev_table[EVDEV_MINORS];
+static DEFINE_MUTEX(evdev_table_mutex);
+
+static void evdev_pass_event(struct evdev_client *client,
+			     struct input_event *event,
+			     ktime_t mono, ktime_t real)
+{
+	event->time = ktime_to_timeval(client->clkid == CLOCK_MONOTONIC ?
+					mono : real);
+
+	/* Interrupts are disabled, just acquire the lock. */
+	spin_lock(&client->buffer_lock);
+
+	client->buffer[client->head++] = *event;
+	client->head &= client->bufsize - 1;
+
+	if (unlikely(client->head == client->tail)) {
+		/*
+		 * This effectively "drops" all unconsumed events, leaving
+		 * EV_SYN/SYN_DROPPED plus the newest event in the queue.
+		 */
+		client->tail = (client->head - 2) & (client->bufsize - 1);
+
+		client->buffer[client->tail].time = event->time;
+		client->buffer[client->tail].type = EV_SYN;
+		client->buffer[client->tail].code = SYN_DROPPED;
+		client->buffer[client->tail].value = 0;
+
+		client->packet_head = client->tail;
+		if (client->use_wake_lock)
+			wake_unlock(&client->wake_lock);
+	}
+
+	if (event->type == EV_SYN && event->code == SYN_REPORT) {
+		client->packet_head = client->head;
+		if (client->use_wake_lock)
+			wake_lock(&client->wake_lock);
+		kill_fasync(&client->fasync, SIGIO, POLL_IN);
+	}
+
+	spin_unlock(&client->buffer_lock);
+}
+
+/*
+ * Pass incoming event to all connected clients.
+ */
+static void evdev_event(struct input_handle *handle,
+			unsigned int type, unsigned int code, int value)
+{
+	struct evdev *evdev = handle->private;
+	struct evdev_client *client;
+	struct input_event event;
+	ktime_t time_mono, time_real;
+
+	time_mono = ktime_get();
+	time_real = ktime_sub(time_mono, ktime_get_monotonic_offset());
+
+	event.type = type;
+	event.code = code;
+	event.value = value;
+
+	rcu_read_lock();
+
+	client = rcu_dereference(evdev->grab);
+
+	if (client)
+		evdev_pass_event(client, &event, time_mono, time_real);
+	else
+		list_for_each_entry_rcu(client, &evdev->client_list, node)
+			evdev_pass_event(client, &event, time_mono, time_real);
+
+	rcu_read_unlock();
+
+	if (type == EV_SYN && code == SYN_REPORT)
+		wake_up_interruptible(&evdev->wait);
+}
+
+static int evdev_fasync(int fd, struct file *file, int on)
+{
+	struct evdev_client *client = file->private_data;
+
+	return fasync_helper(fd, file, on, &client->fasync);
+}
+
+static int evdev_flush(struct file *file, fl_owner_t id)
+{
+	struct evdev_client *client = file->private_data;
+	struct evdev *evdev = client->evdev;
+	int retval;
+
+	retval = mutex_lock_interruptible(&evdev->mutex);
+	if (retval)
+		return retval;
+
+	if (!evdev->exist)
+		retval = -ENODEV;
+	else
+		retval = input_flush_device(&evdev->handle, file);
+
+	mutex_unlock(&evdev->mutex);
+	return retval;
+}
+
+static void evdev_free(struct device *dev)
+{
+	struct evdev *evdev = container_of(dev, struct evdev, dev);
+
+	input_put_device(evdev->handle.dev);
+	kfree(evdev);
+}
+
+/*
+ * Grabs an event device (along with underlying input device).
+ * This function is called with evdev->mutex taken.
+ */
+static int evdev_grab(struct evdev *evdev, struct evdev_client *client)
+{
+	int error;
+
+	if (evdev->grab)
+		return -EBUSY;
+
+	error = input_grab_device(&evdev->handle);
+	if (error)
+		return error;
+
+	rcu_assign_pointer(evdev->grab, client);
+
+	return 0;
+}
+
+static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client)
+{
+	if (evdev->grab != client)
+		return  -EINVAL;
+
+	rcu_assign_pointer(evdev->grab, NULL);
+	synchronize_rcu();
+	input_release_device(&evdev->handle);
+
+	return 0;
+}
+
+static void evdev_attach_client(struct evdev *evdev,
+				struct evdev_client *client)
+{
+	spin_lock(&evdev->client_lock);
+	list_add_tail_rcu(&client->node, &evdev->client_list);
+	spin_unlock(&evdev->client_lock);
+}
+
+static void evdev_detach_client(struct evdev *evdev,
+				struct evdev_client *client)
+{
+	spin_lock(&evdev->client_lock);
+	list_del_rcu(&client->node);
+	spin_unlock(&evdev->client_lock);
+	synchronize_rcu();
+}
+
+static int evdev_open_device(struct evdev *evdev)
+{
+	int retval;
+
+	retval = mutex_lock_interruptible(&evdev->mutex);
+	if (retval)
+		return retval;
+
+	if (!evdev->exist)
+		retval = -ENODEV;
+	else if (!evdev->open++) {
+		retval = input_open_device(&evdev->handle);
+		if (retval)
+			evdev->open--;
+	}
+
+	mutex_unlock(&evdev->mutex);
+	return retval;
+}
+
+static void evdev_close_device(struct evdev *evdev)
+{
+	mutex_lock(&evdev->mutex);
+
+	if (evdev->exist && !--evdev->open)
+		input_close_device(&evdev->handle);
+
+	mutex_unlock(&evdev->mutex);
+}
+
+/*
+ * Wake up users waiting for IO so they can disconnect from
+ * dead device.
+ */
+static void evdev_hangup(struct evdev *evdev)
+{
+	struct evdev_client *client;
+
+	spin_lock(&evdev->client_lock);
+	list_for_each_entry(client, &evdev->client_list, node)
+		kill_fasync(&client->fasync, SIGIO, POLL_HUP);
+	spin_unlock(&evdev->client_lock);
+
+	wake_up_interruptible(&evdev->wait);
+}
+
+static int evdev_release(struct inode *inode, struct file *file)
+{
+	struct evdev_client *client = file->private_data;
+	struct evdev *evdev = client->evdev;
+
+	mutex_lock(&evdev->mutex);
+	if (evdev->grab == client)
+		evdev_ungrab(evdev, client);
+	mutex_unlock(&evdev->mutex);
+
+	evdev_detach_client(evdev, client);
+	if (client->use_wake_lock)
+		wake_lock_destroy(&client->wake_lock);
+	kfree(client);
+
+	evdev_close_device(evdev);
+	put_device(&evdev->dev);
+
+	return 0;
+}
+
+static unsigned int evdev_compute_buffer_size(struct input_dev *dev)
+{
+	unsigned int n_events =
+		max(dev->hint_events_per_packet * EVDEV_BUF_PACKETS,
+		    EVDEV_MIN_BUFFER_SIZE);
+
+	return roundup_pow_of_two(n_events);
+}
+
+static int evdev_open(struct inode *inode, struct file *file)
+{
+	struct evdev *evdev;
+	struct evdev_client *client;
+	int i = iminor(inode) - EVDEV_MINOR_BASE;
+	unsigned int bufsize;
+	int error;
+
+	if (i >= EVDEV_MINORS)
+		return -ENODEV;
+
+	error = mutex_lock_interruptible(&evdev_table_mutex);
+	if (error)
+		return error;
+	evdev = evdev_table[i];
+	if (evdev)
+		get_device(&evdev->dev);
+	mutex_unlock(&evdev_table_mutex);
+
+	if (!evdev)
+		return -ENODEV;
+
+	bufsize = evdev_compute_buffer_size(evdev->handle.dev);
+
+	client = kzalloc(sizeof(struct evdev_client) +
+				bufsize * sizeof(struct input_event),
+			 GFP_KERNEL);
+	if (!client) {
+		error = -ENOMEM;
+		goto err_put_evdev;
+	}
+
+	client->bufsize = bufsize;
+	spin_lock_init(&client->buffer_lock);
+	snprintf(client->name, sizeof(client->name), "%s-%d",
+			dev_name(&evdev->dev), task_tgid_vnr(current));
+	client->evdev = evdev;
+	evdev_attach_client(evdev, client);
+
+	error = evdev_open_device(evdev);
+	if (error)
+		goto err_free_client;
+
+	file->private_data = client;
+	nonseekable_open(inode, file);
+
+	return 0;
+
+ err_free_client:
+	evdev_detach_client(evdev, client);
+	kfree(client);
+ err_put_evdev:
+	put_device(&evdev->dev);
+	return error;
+}
+
+static ssize_t evdev_write(struct file *file, const char __user *buffer,
+			   size_t count, loff_t *ppos)
+{
+	struct evdev_client *client = file->private_data;
+	struct evdev *evdev = client->evdev;
+	struct input_event event;
+	int retval = 0;
+
+	if (count < input_event_size())
+		return -EINVAL;
+
+	retval = mutex_lock_interruptible(&evdev->mutex);
+	if (retval)
+		return retval;
+
+	if (!evdev->exist) {
+		retval = -ENODEV;
+		goto out;
+	}
+
+	do {
+		if (input_event_from_user(buffer + retval, &event)) {
+			retval = -EFAULT;
+			goto out;
+		}
+		retval += input_event_size();
+
+		input_inject_event(&evdev->handle,
+				   event.type, event.code, event.value);
+	} while (retval + input_event_size() <= count);
+
+ out:
+	mutex_unlock(&evdev->mutex);
+	return retval;
+}
+
+static int evdev_fetch_next_event(struct evdev_client *client,
+				  struct input_event *event)
+{
+	int have_event;
+
+	spin_lock_irq(&client->buffer_lock);
+
+	have_event = client->packet_head != client->tail;
+	if (have_event) {
+		*event = client->buffer[client->tail++];
+		client->tail &= client->bufsize - 1;
+		if (client->use_wake_lock &&
+		    client->packet_head == client->tail)
+			wake_unlock(&client->wake_lock);
+	}
+
+	spin_unlock_irq(&client->buffer_lock);
+
+	return have_event;
+}
+
+static ssize_t evdev_read(struct file *file, char __user *buffer,
+			  size_t count, loff_t *ppos)
+{
+	struct evdev_client *client = file->private_data;
+	struct evdev *evdev = client->evdev;
+	struct input_event event;
+	int retval = 0;
+
+	if (count < input_event_size())
+		return -EINVAL;
+
+	if (!(file->f_flags & O_NONBLOCK)) {
+		retval = wait_event_interruptible(evdev->wait,
+				client->packet_head != client->tail ||
+				!evdev->exist);
+		if (retval)
+			return retval;
+	}
+
+	if (!evdev->exist)
+		return -ENODEV;
+
+	while (retval + input_event_size() <= count &&
+	       evdev_fetch_next_event(client, &event)) {
+
+		if (input_event_to_user(buffer + retval, &event))
+			return -EFAULT;
+
+		retval += input_event_size();
+	}
+
+	if (retval == 0 && (file->f_flags & O_NONBLOCK))
+		return -EAGAIN;
+
+	return retval;
+}
+
+/* No kernel lock - fine */
+static unsigned int evdev_poll(struct file *file, poll_table *wait)
+{
+	struct evdev_client *client = file->private_data;
+	struct evdev *evdev = client->evdev;
+	unsigned int mask;
+
+	poll_wait(file, &evdev->wait, wait);
+
+	mask = evdev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR;
+	if (client->packet_head != client->tail)
+		mask |= POLLIN | POLLRDNORM;
+
+	return mask;
+}
+
+#ifdef CONFIG_COMPAT
+
+#define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
+#define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1)
+
+#ifdef __BIG_ENDIAN
+static int bits_to_user(unsigned long *bits, unsigned int maxbit,
+			unsigned int maxlen, void __user *p, int compat)
+{
+	int len, i;
+
+	if (compat) {
+		len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t);
+		if (len > maxlen)
+			len = maxlen;
+
+		for (i = 0; i < len / sizeof(compat_long_t); i++)
+			if (copy_to_user((compat_long_t __user *) p + i,
+					 (compat_long_t *) bits +
+						i + 1 - ((i % 2) << 1),
+					 sizeof(compat_long_t)))
+				return -EFAULT;
+	} else {
+		len = BITS_TO_LONGS(maxbit) * sizeof(long);
+		if (len > maxlen)
+			len = maxlen;
+
+		if (copy_to_user(p, bits, len))
+			return -EFAULT;
+	}
+
+	return len;
+}
+#else
+static int bits_to_user(unsigned long *bits, unsigned int maxbit,
+			unsigned int maxlen, void __user *p, int compat)
+{
+	int len = compat ?
+			BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) :
+			BITS_TO_LONGS(maxbit) * sizeof(long);
+
+	if (len > maxlen)
+		len = maxlen;
+
+	return copy_to_user(p, bits, len) ? -EFAULT : len;
+}
+#endif /* __BIG_ENDIAN */
+
+#else
+
+static int bits_to_user(unsigned long *bits, unsigned int maxbit,
+			unsigned int maxlen, void __user *p, int compat)
+{
+	int len = BITS_TO_LONGS(maxbit) * sizeof(long);
+
+	if (len > maxlen)
+		len = maxlen;
+
+	return copy_to_user(p, bits, len) ? -EFAULT : len;
+}
+
+#endif /* CONFIG_COMPAT */
+
+static int str_to_user(const char *str, unsigned int maxlen, void __user *p)
+{
+	int len;
+
+	if (!str)
+		return -ENOENT;
+
+	len = strlen(str) + 1;
+	if (len > maxlen)
+		len = maxlen;
+
+	return copy_to_user(p, str, len) ? -EFAULT : len;
+}
+
+#define OLD_KEY_MAX	0x1ff
+static int handle_eviocgbit(struct input_dev *dev,
+			    unsigned int type, unsigned int size,
+			    void __user *p, int compat_mode)
+{
+	static unsigned long keymax_warn_time;
+	unsigned long *bits;
+	int len;
+
+	switch (type) {
+
+	case      0: bits = dev->evbit;  len = EV_MAX;  break;
+	case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
+	case EV_REL: bits = dev->relbit; len = REL_MAX; break;
+	case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
+	case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
+	case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
+	case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
+	case EV_FF:  bits = dev->ffbit;  len = FF_MAX;  break;
+	case EV_SW:  bits = dev->swbit;  len = SW_MAX;  break;
+	default: return -EINVAL;
+	}
+
+	/*
+	 * Work around bugs in userspace programs that like to do
+	 * EVIOCGBIT(EV_KEY, KEY_MAX) and not realize that 'len'
+	 * should be in bytes, not in bits.
+	 */
+	if (type == EV_KEY && size == OLD_KEY_MAX) {
+		len = OLD_KEY_MAX;
+		if (printk_timed_ratelimit(&keymax_warn_time, 10 * 1000))
+			pr_warning("(EVIOCGBIT): Suspicious buffer size %u, "
+				   "limiting output to %zu bytes. See "
+				   "http://userweb.kernel.org/~dtor/eviocgbit-bug.html\n",
+				   OLD_KEY_MAX,
+				   BITS_TO_LONGS(OLD_KEY_MAX) * sizeof(long));
+	}
+
+	return bits_to_user(bits, len, size, p, compat_mode);
+}
+#undef OLD_KEY_MAX
+
+static int evdev_handle_get_keycode(struct input_dev *dev, void __user *p)
+{
+	struct input_keymap_entry ke = {
+		.len	= sizeof(unsigned int),
+		.flags	= 0,
+	};
+	int __user *ip = (int __user *)p;
+	int error;
+
+	/* legacy case */
+	if (copy_from_user(ke.scancode, p, sizeof(unsigned int)))
+		return -EFAULT;
+
+	error = input_get_keycode(dev, &ke);
+	if (error)
+		return error;
+
+	if (put_user(ke.keycode, ip + 1))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int evdev_handle_get_keycode_v2(struct input_dev *dev, void __user *p)
+{
+	struct input_keymap_entry ke;
+	int error;
+
+	if (copy_from_user(&ke, p, sizeof(ke)))
+		return -EFAULT;
+
+	error = input_get_keycode(dev, &ke);
+	if (error)
+		return error;
+
+	if (copy_to_user(p, &ke, sizeof(ke)))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int evdev_handle_set_keycode(struct input_dev *dev, void __user *p)
+{
+	struct input_keymap_entry ke = {
+		.len	= sizeof(unsigned int),
+		.flags	= 0,
+	};
+	int __user *ip = (int __user *)p;
+
+	if (copy_from_user(ke.scancode, p, sizeof(unsigned int)))
+		return -EFAULT;
+
+	if (get_user(ke.keycode, ip + 1))
+		return -EFAULT;
+
+	return input_set_keycode(dev, &ke);
+}
+
+static int evdev_handle_set_keycode_v2(struct input_dev *dev, void __user *p)
+{
+	struct input_keymap_entry ke;
+
+	if (copy_from_user(&ke, p, sizeof(ke)))
+		return -EFAULT;
+
+	if (ke.len > sizeof(ke.scancode))
+		return -EINVAL;
+
+	return input_set_keycode(dev, &ke);
+}
+
+static int evdev_handle_mt_request(struct input_dev *dev,
+				   unsigned int size,
+				   int __user *ip)
+{
+	const struct input_mt_slot *mt = dev->mt;
+	unsigned int code;
+	int max_slots;
+	int i;
+
+	if (get_user(code, &ip[0]))
+		return -EFAULT;
+	if (!input_is_mt_value(code))
+		return -EINVAL;
+
+	max_slots = (size - sizeof(__u32)) / sizeof(__s32);
+	for (i = 0; i < dev->mtsize && i < max_slots; i++)
+		if (put_user(input_mt_get_value(&mt[i], code), &ip[1 + i]))
+			return -EFAULT;
+
+	return 0;
+}
+
+static int evdev_enable_suspend_block(struct evdev *evdev,
+				      struct evdev_client *client)
+{
+	if (client->use_wake_lock)
+		return 0;
+
+	spin_lock_irq(&client->buffer_lock);
+	wake_lock_init(&client->wake_lock, WAKE_LOCK_SUSPEND, client->name);
+	client->use_wake_lock = true;
+	if (client->packet_head != client->tail)
+		wake_lock(&client->wake_lock);
+	spin_unlock_irq(&client->buffer_lock);
+	return 0;
+}
+
+static int evdev_disable_suspend_block(struct evdev *evdev,
+				       struct evdev_client *client)
+{
+	if (!client->use_wake_lock)
+		return 0;
+
+	spin_lock_irq(&client->buffer_lock);
+	client->use_wake_lock = false;
+	wake_lock_destroy(&client->wake_lock);
+	spin_unlock_irq(&client->buffer_lock);
+
+	return 0;
+}
+
+static long evdev_do_ioctl(struct file *file, unsigned int cmd,
+			   void __user *p, int compat_mode)
+{
+	struct evdev_client *client = file->private_data;
+	struct evdev *evdev = client->evdev;
+	struct input_dev *dev = evdev->handle.dev;
+	struct input_absinfo abs;
+	struct ff_effect effect;
+	int __user *ip = (int __user *)p;
+	unsigned int i, t, u, v;
+	unsigned int size;
+	int error;
+
+	/* First we check for fixed-length commands */
+	switch (cmd) {
+
+	case EVIOCGVERSION:
+		return put_user(EV_VERSION, ip);
+
+	case EVIOCGID:
+		if (copy_to_user(p, &dev->id, sizeof(struct input_id)))
+			return -EFAULT;
+		return 0;
+
+	case EVIOCGREP:
+		if (!test_bit(EV_REP, dev->evbit))
+			return -ENOSYS;
+		if (put_user(dev->rep[REP_DELAY], ip))
+			return -EFAULT;
+		if (put_user(dev->rep[REP_PERIOD], ip + 1))
+			return -EFAULT;
+		return 0;
+
+	case EVIOCSREP:
+		if (!test_bit(EV_REP, dev->evbit))
+			return -ENOSYS;
+		if (get_user(u, ip))
+			return -EFAULT;
+		if (get_user(v, ip + 1))
+			return -EFAULT;
+
+		input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u);
+		input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v);
+
+		return 0;
+
+	case EVIOCRMFF:
+		return input_ff_erase(dev, (int)(unsigned long) p, file);
+
+	case EVIOCGEFFECTS:
+		i = test_bit(EV_FF, dev->evbit) ?
+				dev->ff->max_effects : 0;
+		if (put_user(i, ip))
+			return -EFAULT;
+		return 0;
+
+	case EVIOCGRAB:
+		if (p)
+			return evdev_grab(evdev, client);
+		else
+			return evdev_ungrab(evdev, client);
+
+	case EVIOCSCLOCKID:
+		if (copy_from_user(&i, p, sizeof(unsigned int)))
+			return -EFAULT;
+		if (i != CLOCK_MONOTONIC && i != CLOCK_REALTIME)
+			return -EINVAL;
+		client->clkid = i;
+		return 0;
+
+	case EVIOCGKEYCODE:
+		return evdev_handle_get_keycode(dev, p);
+
+	case EVIOCSKEYCODE:
+		return evdev_handle_set_keycode(dev, p);
+
+	case EVIOCGKEYCODE_V2:
+		return evdev_handle_get_keycode_v2(dev, p);
+
+	case EVIOCSKEYCODE_V2:
+		return evdev_handle_set_keycode_v2(dev, p);
+
+	case EVIOCGSUSPENDBLOCK:
+		return put_user(client->use_wake_lock, ip);
+
+	case EVIOCSSUSPENDBLOCK:
+		if (p)
+			return evdev_enable_suspend_block(evdev, client);
+		else
+			return evdev_disable_suspend_block(evdev, client);
+	}
+
+	size = _IOC_SIZE(cmd);
+
+	/* Now check variable-length commands */
+#define EVIOC_MASK_SIZE(nr)	((nr) & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT))
+	switch (EVIOC_MASK_SIZE(cmd)) {
+
+	case EVIOCGPROP(0):
+		return bits_to_user(dev->propbit, INPUT_PROP_MAX,
+				    size, p, compat_mode);
+
+	case EVIOCGMTSLOTS(0):
+		return evdev_handle_mt_request(dev, size, ip);
+
+	case EVIOCGKEY(0):
+		return bits_to_user(dev->key, KEY_MAX, size, p, compat_mode);
+
+	case EVIOCGLED(0):
+		return bits_to_user(dev->led, LED_MAX, size, p, compat_mode);
+
+	case EVIOCGSND(0):
+		return bits_to_user(dev->snd, SND_MAX, size, p, compat_mode);
+
+	case EVIOCGSW(0):
+		return bits_to_user(dev->sw, SW_MAX, size, p, compat_mode);
+
+	case EVIOCGNAME(0):
+		return str_to_user(dev->name, size, p);
+
+	case EVIOCGPHYS(0):
+		return str_to_user(dev->phys, size, p);
+
+	case EVIOCGUNIQ(0):
+		return str_to_user(dev->uniq, size, p);
+
+	case EVIOC_MASK_SIZE(EVIOCSFF):
+		if (input_ff_effect_from_user(p, size, &effect))
+			return -EFAULT;
+
+		error = input_ff_upload(dev, &effect, file);
+
+		if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
+			return -EFAULT;
+
+		return error;
+	}
+
+	/* Multi-number variable-length handlers */
+	if (_IOC_TYPE(cmd) != 'E')
+		return -EINVAL;
+
+	if (_IOC_DIR(cmd) == _IOC_READ) {
+
+		if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0)))
+			return handle_eviocgbit(dev,
+						_IOC_NR(cmd) & EV_MAX, size,
+						p, compat_mode);
+
+		if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
+
+			if (!dev->absinfo)
+				return -EINVAL;
+
+			t = _IOC_NR(cmd) & ABS_MAX;
+			abs = dev->absinfo[t];
+
+			if (copy_to_user(p, &abs, min_t(size_t,
+					size, sizeof(struct input_absinfo))))
+				return -EFAULT;
+
+			return 0;
+		}
+	}
+
+	if (_IOC_DIR(cmd) == _IOC_WRITE) {
+
+		if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
+
+			if (!dev->absinfo)
+				return -EINVAL;
+
+			t = _IOC_NR(cmd) & ABS_MAX;
+
+			if (copy_from_user(&abs, p, min_t(size_t,
+					size, sizeof(struct input_absinfo))))
+				return -EFAULT;
+
+			if (size < sizeof(struct input_absinfo))
+				abs.resolution = 0;
+
+			/* We can't change number of reserved MT slots */
+			if (t == ABS_MT_SLOT)
+				return -EINVAL;
+
+			/*
+			 * Take event lock to ensure that we are not
+			 * changing device parameters in the middle
+			 * of event.
+			 */
+			spin_lock_irq(&dev->event_lock);
+			dev->absinfo[t] = abs;
+			spin_unlock_irq(&dev->event_lock);
+
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
+
+static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
+				void __user *p, int compat_mode)
+{
+	struct evdev_client *client = file->private_data;
+	struct evdev *evdev = client->evdev;
+	int retval;
+
+	retval = mutex_lock_interruptible(&evdev->mutex);
+	if (retval)
+		return retval;
+
+	if (!evdev->exist) {
+		retval = -ENODEV;
+		goto out;
+	}
+
+	retval = evdev_do_ioctl(file, cmd, p, compat_mode);
+
+ out:
+	mutex_unlock(&evdev->mutex);
+	return retval;
+}
+
+static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);
+}
+
+#ifdef CONFIG_COMPAT
+static long evdev_ioctl_compat(struct file *file,
+				unsigned int cmd, unsigned long arg)
+{
+	return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1);
+}
+#endif
+
+static const struct file_operations evdev_fops = {
+	.owner		= THIS_MODULE,
+	.read		= evdev_read,
+	.write		= evdev_write,
+	.poll		= evdev_poll,
+	.open		= evdev_open,
+	.release	= evdev_release,
+	.unlocked_ioctl	= evdev_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl	= evdev_ioctl_compat,
+#endif
+	.fasync		= evdev_fasync,
+	.flush		= evdev_flush,
+	.llseek		= no_llseek,
+};
+
+static int evdev_install_chrdev(struct evdev *evdev)
+{
+	/*
+	 * No need to do any locking here as calls to connect and
+	 * disconnect are serialized by the input core
+	 */
+	evdev_table[evdev->minor] = evdev;
+	return 0;
+}
+
+static void evdev_remove_chrdev(struct evdev *evdev)
+{
+	/*
+	 * Lock evdev table to prevent race with evdev_open()
+	 */
+	mutex_lock(&evdev_table_mutex);
+	evdev_table[evdev->minor] = NULL;
+	mutex_unlock(&evdev_table_mutex);
+}
+
+/*
+ * Mark device non-existent. This disables writes, ioctls and
+ * prevents new users from opening the device. Already posted
+ * blocking reads will stay, however new ones will fail.
+ */
+static void evdev_mark_dead(struct evdev *evdev)
+{
+	mutex_lock(&evdev->mutex);
+	evdev->exist = false;
+	mutex_unlock(&evdev->mutex);
+}
+
+static void evdev_cleanup(struct evdev *evdev)
+{
+	struct input_handle *handle = &evdev->handle;
+
+	evdev_mark_dead(evdev);
+	evdev_hangup(evdev);
+	evdev_remove_chrdev(evdev);
+
+	/* evdev is marked dead so no one else accesses evdev->open */
+	if (evdev->open) {
+		input_flush_device(handle, NULL);
+		input_close_device(handle);
+	}
+}
+
+/*
+ * Create new evdev device. Note that input core serializes calls
+ * to connect and disconnect so we don't need to lock evdev_table here.
+ */
+static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
+			 const struct input_device_id *id)
+{
+	struct evdev *evdev;
+	int minor;
+	int error;
+
+	for (minor = 0; minor < EVDEV_MINORS; minor++)
+		if (!evdev_table[minor])
+			break;
+
+	if (minor == EVDEV_MINORS) {
+		pr_err("no more free evdev devices\n");
+		return -ENFILE;
+	}
+
+	evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL);
+	if (!evdev)
+		return -ENOMEM;
+
+	INIT_LIST_HEAD(&evdev->client_list);
+	spin_lock_init(&evdev->client_lock);
+	mutex_init(&evdev->mutex);
+	init_waitqueue_head(&evdev->wait);
+
+	dev_set_name(&evdev->dev, "event%d", minor);
+	evdev->exist = true;
+	evdev->minor = minor;
+
+	evdev->handle.dev = input_get_device(dev);
+	evdev->handle.name = dev_name(&evdev->dev);
+	evdev->handle.handler = handler;
+	evdev->handle.private = evdev;
+
+	evdev->dev.devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor);
+	evdev->dev.class = &input_class;
+	evdev->dev.parent = &dev->dev;
+	evdev->dev.release = evdev_free;
+	device_initialize(&evdev->dev);
+
+	error = input_register_handle(&evdev->handle);
+	if (error)
+		goto err_free_evdev;
+
+	error = evdev_install_chrdev(evdev);
+	if (error)
+		goto err_unregister_handle;
+
+	error = device_add(&evdev->dev);
+	if (error)
+		goto err_cleanup_evdev;
+
+	return 0;
+
+ err_cleanup_evdev:
+	evdev_cleanup(evdev);
+ err_unregister_handle:
+	input_unregister_handle(&evdev->handle);
+ err_free_evdev:
+	put_device(&evdev->dev);
+	return error;
+}
+
+static void evdev_disconnect(struct input_handle *handle)
+{
+	struct evdev *evdev = handle->private;
+
+	device_del(&evdev->dev);
+	evdev_cleanup(evdev);
+	input_unregister_handle(handle);
+	put_device(&evdev->dev);
+}
+
+static const struct input_device_id evdev_ids[] = {
+	{ .driver_info = 1 },	/* Matches all devices */
+	{ },			/* Terminating zero entry */
+};
+
+MODULE_DEVICE_TABLE(input, evdev_ids);
+
+static struct input_handler evdev_handler = {
+	.event		= evdev_event,
+	.connect	= evdev_connect,
+	.disconnect	= evdev_disconnect,
+	.fops		= &evdev_fops,
+	.minor		= EVDEV_MINOR_BASE,
+	.name		= "evdev",
+	.id_table	= evdev_ids,
+};
+
+static int __init evdev_init(void)
+{
+	return input_register_handler(&evdev_handler);
+}
+
+static void __exit evdev_exit(void)
+{
+	input_unregister_handler(&evdev_handler);
+}
+
+module_init(evdev_init);
+module_exit(evdev_exit);
+
+MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
+MODULE_DESCRIPTION("Input driver event char devices");
+MODULE_LICENSE("GPL");