drivers/input/evdev.c - kernel/msm-4.19 - Gitiles

 /*
  * 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 EVDEV_MINOR_BASE	64
 #define EVDEV_MINORS		32
 #define EVDEV_BUFFER_SIZE	64

 #include <linux/poll.h>
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/input.h>
 #include <linux/major.h>
 #include <linux/smp_lock.h>
 #include <linux/device.h>
 #include <linux/devfs_fs_kernel.h>

 struct evdev {
 	int exist;
 	int open;
 	int minor;
 	char name[16];
 	struct input_handle handle;
 	wait_queue_head_t wait;
 	struct evdev_list *grab;
 	struct list_head list;
 };

 struct evdev_list {
 	struct input_event buffer[EVDEV_BUFFER_SIZE];
 	int head;
 	int tail;
 	struct fasync_struct *fasync;
 	struct evdev *evdev;
 	struct list_head node;
 };

 static struct evdev *evdev_table[EVDEV_MINORS];

 static void evdev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
 {
 	struct evdev *evdev = handle->private;
 	struct evdev_list *list;

 	if (evdev->grab) {
 		list = evdev->grab;

 		do_gettimeofday(&list->buffer[list->head].time);
 		list->buffer[list->head].type = type;
 		list->buffer[list->head].code = code;
 		list->buffer[list->head].value = value;
 		list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1);

 		kill_fasync(&list->fasync, SIGIO, POLL_IN);
 	} else
 		list_for_each_entry(list, &evdev->list, node) {

 			do_gettimeofday(&list->buffer[list->head].time);
 			list->buffer[list->head].type = type;
 			list->buffer[list->head].code = code;
 			list->buffer[list->head].value = value;
 			list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1);

 			kill_fasync(&list->fasync, SIGIO, POLL_IN);
 		}

 	wake_up_interruptible(&evdev->wait);
 }

 static int evdev_fasync(int fd, struct file *file, int on)
 {
 	int retval;
 	struct evdev_list *list = file->private_data;
 	retval = fasync_helper(fd, file, on, &list->fasync);
 	return retval < 0 ? retval : 0;
 }

 static int evdev_flush(struct file * file)
 {
 	struct evdev_list *list = file->private_data;
 	if (!list->evdev->exist) return -ENODEV;
 	return input_flush_device(&list->evdev->handle, file);
 }

 static void evdev_free(struct evdev *evdev)
 {
 	evdev_table[evdev->minor] = NULL;
 	kfree(evdev);
 }

 static int evdev_release(struct inode * inode, struct file * file)
 {
 	struct evdev_list *list = file->private_data;

 	if (list->evdev->grab == list) {
 		input_release_device(&list->evdev->handle);
 		list->evdev->grab = NULL;
 	}

 	evdev_fasync(-1, file, 0);
 	list_del(&list->node);

 	if (!--list->evdev->open) {
 		if (list->evdev->exist)
 			input_close_device(&list->evdev->handle);
 		else
 			evdev_free(list->evdev);
 	}

 	kfree(list);
 	return 0;
 }

 static int evdev_open(struct inode * inode, struct file * file)
 {
 	struct evdev_list *list;
 	int i = iminor(inode) - EVDEV_MINOR_BASE;
 	int accept_err;

 	if (i >= EVDEV_MINORS || !evdev_table[i] || !evdev_table[i]->exist)
 		return -ENODEV;

 	if ((accept_err = input_accept_process(&(evdev_table[i]->handle), file)))
 		return accept_err;

 	if (!(list = kmalloc(sizeof(struct evdev_list), GFP_KERNEL)))
 		return -ENOMEM;
 	memset(list, 0, sizeof(struct evdev_list));

 	list->evdev = evdev_table[i];
 	list_add_tail(&list->node, &evdev_table[i]->list);
 	file->private_data = list;

 	if (!list->evdev->open++)
 		if (list->evdev->exist)
 			input_open_device(&list->evdev->handle);

 	return 0;
 }

 static ssize_t evdev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
 {
 	struct evdev_list *list = file->private_data;
 	struct input_event event;
 	int retval = 0;

 	if (!list->evdev->exist) return -ENODEV;

 	while (retval < count) {

 		if (copy_from_user(&event, buffer + retval, sizeof(struct input_event)))
 			return -EFAULT;
 		input_event(list->evdev->handle.dev, event.type, event.code, event.value);
 		retval += sizeof(struct input_event);
 	}

 	return retval;
 }

 static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
 {
 	struct evdev_list *list = file->private_data;
 	int retval;

 	if (count < sizeof(struct input_event))
 		return -EINVAL;

 	if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK))
 		return -EAGAIN;

 	retval = wait_event_interruptible(list->evdev->wait,
 		list->head != list->tail || (!list->evdev->exist));

 	if (retval)
 		return retval;

 	if (!list->evdev->exist)
 		return -ENODEV;

 	while (list->head != list->tail && retval + sizeof(struct input_event) <= count) {
 		if (copy_to_user(buffer + retval, list->buffer + list->tail,
 			 sizeof(struct input_event))) return -EFAULT;
 		list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
 		retval += sizeof(struct input_event);
 	}

 	return retval;
 }

 /* No kernel lock - fine */
 static unsigned int evdev_poll(struct file *file, poll_table *wait)
 {
 	struct evdev_list *list = file->private_data;
 	poll_wait(file, &list->evdev->wait, wait);
 	return ((list->head == list->tail) ? 0 : (POLLIN | POLLRDNORM)) |
 		(list->evdev->exist ? 0 : (POLLHUP | POLLERR));
 }

 static int evdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 {
 	struct evdev_list *list = file->private_data;
 	struct evdev *evdev = list->evdev;
 	struct input_dev *dev = evdev->handle.dev;
 	struct input_absinfo abs;
 	void __user *p = (void __user *)arg;
 	int __user *ip = (int __user *)arg;
 	int i, t, u, v;

 	if (!evdev->exist) return -ENODEV;

 	switch (cmd) {

 		case EVIOCGVERSION:
 			return put_user(EV_VERSION, ip);

 		case EVIOCGID:
 			return copy_to_user(p, &dev->id, sizeof(struct input_id)) ? -EFAULT : 0;

 		case EVIOCGKEYCODE:
 			if (get_user(t, ip)) return -EFAULT;
 			if (t < 0 || t >= dev->keycodemax || !dev->keycodesize) return -EINVAL;
 			if (put_user(INPUT_KEYCODE(dev, t), ip + 1)) return -EFAULT;
 			return 0;

 		case EVIOCSKEYCODE:
 			if (get_user(t, ip)) return -EFAULT;
 			if (t < 0 || t >= dev->keycodemax || !dev->keycodesize) return -EINVAL;
 			if (get_user(v, ip + 1)) return -EFAULT;
 			if (v < 0 || v > KEY_MAX) return -EINVAL;
 			u = SET_INPUT_KEYCODE(dev, t, v);
 			clear_bit(u, dev->keybit);
 			set_bit(v, dev->keybit);
 			for (i = 0; i < dev->keycodemax; i++)
 				if (INPUT_KEYCODE(dev,i) == u)
 					set_bit(u, dev->keybit);
 			return 0;

 		case EVIOCSFF:
 			if (dev->upload_effect) {
 				struct ff_effect effect;
 				int err;

 				if (copy_from_user(&effect, p, sizeof(effect)))
 					return -EFAULT;
 				err = dev->upload_effect(dev, &effect);
 				if (put_user(effect.id, &(((struct ff_effect __user *)arg)->id)))
 					return -EFAULT;
 				return err;
 			}
 			else return -ENOSYS;

 		case EVIOCRMFF:
 			if (dev->erase_effect) {
 				return dev->erase_effect(dev, (int)arg);
 			}
 			else return -ENOSYS;

 		case EVIOCGEFFECTS:
 			if (put_user(dev->ff_effects_max, ip))
 				return -EFAULT;
 			return 0;

 		case EVIOCGRAB:
 			if (arg) {
 				if (evdev->grab)
 					return -EBUSY;
 				if (input_grab_device(&evdev->handle))
 					return -EBUSY;
 				evdev->grab = list;
 				return 0;
 			} else {
 				if (evdev->grab != list)
 					return -EINVAL;
 				input_release_device(&evdev->handle);
 				evdev->grab = NULL;
 				return 0;
 			}

 		default:

 			if (_IOC_TYPE(cmd) != 'E' || _IOC_DIR(cmd) != _IOC_READ)
 				return -EINVAL;

 			if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {

 				long *bits;
 				int len;

 				switch (_IOC_NR(cmd) & EV_MAX) {
 					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;
 					default: return -EINVAL;
 				}
 				len = NBITS(len) * sizeof(long);
 				if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 				return copy_to_user(p, bits, len) ? -EFAULT : len;
 			}

 			if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) {
 				int len;
 				len = NBITS(KEY_MAX) * sizeof(long);
 				if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 				return copy_to_user(p, dev->key, len) ? -EFAULT : len;
 			}

 			if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) {
 				int len;
 				len = NBITS(LED_MAX) * sizeof(long);
 				if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 				return copy_to_user(p, dev->led, len) ? -EFAULT : len;
 			}

 			if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) {
 				int len;
 				len = NBITS(SND_MAX) * sizeof(long);
 				if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 				return copy_to_user(p, dev->snd, len) ? -EFAULT : len;
 			}

 			if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) {
 				int len;
 				if (!dev->name) return -ENOENT;
 				len = strlen(dev->name) + 1;
 				if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 				return copy_to_user(p, dev->name, len) ? -EFAULT : len;
 			}

 			if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) {
 				int len;
 				if (!dev->phys) return -ENOENT;
 				len = strlen(dev->phys) + 1;
 				if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 				return copy_to_user(p, dev->phys, len) ? -EFAULT : len;
 			}

 			if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) {
 				int len;
 				if (!dev->uniq) return -ENOENT;
 				len = strlen(dev->uniq) + 1;
 				if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 				return copy_to_user(p, dev->uniq, len) ? -EFAULT : len;
 			}

 			if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {

 				int t = _IOC_NR(cmd) & ABS_MAX;

 				abs.value = dev->abs[t];
 				abs.minimum = dev->absmin[t];
 				abs.maximum = dev->absmax[t];
 				abs.fuzz = dev->absfuzz[t];
 				abs.flat = dev->absflat[t];

 				if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
 					return -EFAULT;

 				return 0;
 			}

 			if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {

 				int t = _IOC_NR(cmd) & ABS_MAX;

 				if (copy_from_user(&abs, p, sizeof(struct input_absinfo)))
 					return -EFAULT;

 				dev->abs[t] = abs.value;
 				dev->absmin[t] = abs.minimum;
 				dev->absmax[t] = abs.maximum;
 				dev->absfuzz[t] = abs.fuzz;
 				dev->absflat[t] = abs.flat;

 				return 0;
 			}
 	}
 	return -EINVAL;
 }

 static struct file_operations evdev_fops = {
 	.owner =	THIS_MODULE,
 	.read =		evdev_read,
 	.write =	evdev_write,
 	.poll =		evdev_poll,
 	.open =		evdev_open,
 	.release =	evdev_release,
 	.ioctl =	evdev_ioctl,
 	.fasync =	evdev_fasync,
 	.flush =	evdev_flush
 };

 static struct input_handle *evdev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
 {
 	struct evdev *evdev;
 	int minor;

 	for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++);
 	if (minor == EVDEV_MINORS) {
 		printk(KERN_ERR "evdev: no more free evdev devices\n");
 		return NULL;
 	}

 	if (!(evdev = kmalloc(sizeof(struct evdev), GFP_KERNEL)))
 		return NULL;
 	memset(evdev, 0, sizeof(struct evdev));

 	INIT_LIST_HEAD(&evdev->list);
 	init_waitqueue_head(&evdev->wait);

 	evdev->exist = 1;
 	evdev->minor = minor;
 	evdev->handle.dev = dev;
 	evdev->handle.name = evdev->name;
 	evdev->handle.handler = handler;
 	evdev->handle.private = evdev;
 	sprintf(evdev->name, "event%d", minor);

 	evdev_table[minor] = evdev;

 	devfs_mk_cdev(MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
 			S_IFCHR|S_IRUGO|S_IWUSR, "input/event%d", minor);
 	class_device_create(input_class,
 			MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
 			dev->dev, "event%d", minor);

 	return &evdev->handle;
 }

 static void evdev_disconnect(struct input_handle *handle)
 {
 	struct evdev *evdev = handle->private;
 	struct evdev_list *list;

 	class_device_destroy(input_class,
 			MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + evdev->minor));
 	devfs_remove("input/event%d", evdev->minor);
 	evdev->exist = 0;

 	if (evdev->open) {
 		input_close_device(handle);
 		wake_up_interruptible(&evdev->wait);
 		list_for_each_entry(list, &evdev->list, node)
 			kill_fasync(&list->fasync, SIGIO, POLL_HUP);
 	} else
 		evdev_free(evdev);
 }

 static 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)
 {
 	input_register_handler(&evdev_handler);
 	return 0;
 }

 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");
	/*
	* 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 EVDEV_MINOR_BASE 64
	#define EVDEV_MINORS 32
	#define EVDEV_BUFFER_SIZE 64

	#include <linux/poll.h>
	#include <linux/slab.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/input.h>
	#include <linux/major.h>
	#include <linux/smp_lock.h>
	#include <linux/device.h>
	#include <linux/devfs_fs_kernel.h>

	struct evdev {
	int exist;
	int open;
	int minor;
	char name[16];
	struct input_handle handle;
	wait_queue_head_t wait;
	struct evdev_list *grab;
	struct list_head list;
	};

	struct evdev_list {
	struct input_event buffer[EVDEV_BUFFER_SIZE];
	int head;
	int tail;
	struct fasync_struct *fasync;
	struct evdev *evdev;
	struct list_head node;
	};

	static struct evdev *evdev_table[EVDEV_MINORS];

	static void evdev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
	{
	struct evdev *evdev = handle->private;
	struct evdev_list *list;

	if (evdev->grab) {
	list = evdev->grab;

	do_gettimeofday(&list->buffer[list->head].time);
	list->buffer[list->head].type = type;
	list->buffer[list->head].code = code;
	list->buffer[list->head].value = value;
	list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1);

	kill_fasync(&list->fasync, SIGIO, POLL_IN);
	} else
	list_for_each_entry(list, &evdev->list, node) {

	do_gettimeofday(&list->buffer[list->head].time);
	list->buffer[list->head].type = type;
	list->buffer[list->head].code = code;
	list->buffer[list->head].value = value;
	list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1);

	kill_fasync(&list->fasync, SIGIO, POLL_IN);
	}

	wake_up_interruptible(&evdev->wait);
	}

	static int evdev_fasync(int fd, struct file *file, int on)
	{
	int retval;
	struct evdev_list *list = file->private_data;
	retval = fasync_helper(fd, file, on, &list->fasync);
	return retval < 0 ? retval : 0;
	}

	static int evdev_flush(struct file * file)
	{
	struct evdev_list *list = file->private_data;
	if (!list->evdev->exist) return -ENODEV;
	return input_flush_device(&list->evdev->handle, file);
	}

	static void evdev_free(struct evdev *evdev)
	{
	evdev_table[evdev->minor] = NULL;
	kfree(evdev);
	}

	static int evdev_release(struct inode * inode, struct file * file)
	{
	struct evdev_list *list = file->private_data;

	if (list->evdev->grab == list) {
	input_release_device(&list->evdev->handle);
	list->evdev->grab = NULL;
	}

	evdev_fasync(-1, file, 0);
	list_del(&list->node);

	if (!--list->evdev->open) {
	if (list->evdev->exist)
	input_close_device(&list->evdev->handle);
	else
	evdev_free(list->evdev);
	}

	kfree(list);
	return 0;
	}

	static int evdev_open(struct inode * inode, struct file * file)
	{
	struct evdev_list *list;
	int i = iminor(inode) - EVDEV_MINOR_BASE;
	int accept_err;

	if (i >= EVDEV_MINORS \|\| !evdev_table[i] \|\| !evdev_table[i]->exist)
	return -ENODEV;

	if ((accept_err = input_accept_process(&(evdev_table[i]->handle), file)))
	return accept_err;

	if (!(list = kmalloc(sizeof(struct evdev_list), GFP_KERNEL)))
	return -ENOMEM;
	memset(list, 0, sizeof(struct evdev_list));

	list->evdev = evdev_table[i];
	list_add_tail(&list->node, &evdev_table[i]->list);
	file->private_data = list;

	if (!list->evdev->open++)
	if (list->evdev->exist)
	input_open_device(&list->evdev->handle);

	return 0;
	}

	static ssize_t evdev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
	{
	struct evdev_list *list = file->private_data;
	struct input_event event;
	int retval = 0;

	if (!list->evdev->exist) return -ENODEV;

	while (retval < count) {

	if (copy_from_user(&event, buffer + retval, sizeof(struct input_event)))
	return -EFAULT;
	input_event(list->evdev->handle.dev, event.type, event.code, event.value);
	retval += sizeof(struct input_event);
	}

	return retval;
	}

	static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
	{
	struct evdev_list *list = file->private_data;
	int retval;

	if (count < sizeof(struct input_event))
	return -EINVAL;

	if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK))
	return -EAGAIN;

	retval = wait_event_interruptible(list->evdev->wait,
	list->head != list->tail \|\| (!list->evdev->exist));

	if (retval)
	return retval;

	if (!list->evdev->exist)
	return -ENODEV;

	while (list->head != list->tail && retval + sizeof(struct input_event) <= count) {
	if (copy_to_user(buffer + retval, list->buffer + list->tail,
	sizeof(struct input_event))) return -EFAULT;
	list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
	retval += sizeof(struct input_event);
	}

	return retval;
	}

	/* No kernel lock - fine */
	static unsigned int evdev_poll(struct file file, poll_table wait)
	{
	struct evdev_list *list = file->private_data;
	poll_wait(file, &list->evdev->wait, wait);
	return ((list->head == list->tail) ? 0 : (POLLIN \| POLLRDNORM)) \|
	(list->evdev->exist ? 0 : (POLLHUP \| POLLERR));
	}

	static int evdev_ioctl(struct inode inode, struct file file, unsigned int cmd, unsigned long arg)
	{
	struct evdev_list *list = file->private_data;
	struct evdev *evdev = list->evdev;
	struct input_dev *dev = evdev->handle.dev;
	struct input_absinfo abs;
	void __user p = (void __user )arg;
	int __user ip = (int __user )arg;
	int i, t, u, v;

	if (!evdev->exist) return -ENODEV;

	switch (cmd) {

	case EVIOCGVERSION:
	return put_user(EV_VERSION, ip);

	case EVIOCGID:
	return copy_to_user(p, &dev->id, sizeof(struct input_id)) ? -EFAULT : 0;

	case EVIOCGKEYCODE:
	if (get_user(t, ip)) return -EFAULT;
	if (t < 0 \|\| t >= dev->keycodemax \|\| !dev->keycodesize) return -EINVAL;
	if (put_user(INPUT_KEYCODE(dev, t), ip + 1)) return -EFAULT;
	return 0;

	case EVIOCSKEYCODE:
	if (get_user(t, ip)) return -EFAULT;
	if (t < 0 \|\| t >= dev->keycodemax \|\| !dev->keycodesize) return -EINVAL;
	if (get_user(v, ip + 1)) return -EFAULT;
	if (v < 0 \|\| v > KEY_MAX) return -EINVAL;
	u = SET_INPUT_KEYCODE(dev, t, v);
	clear_bit(u, dev->keybit);
	set_bit(v, dev->keybit);
	for (i = 0; i < dev->keycodemax; i++)
	if (INPUT_KEYCODE(dev,i) == u)
	set_bit(u, dev->keybit);
	return 0;

	case EVIOCSFF:
	if (dev->upload_effect) {
	struct ff_effect effect;
	int err;

	if (copy_from_user(&effect, p, sizeof(effect)))
	return -EFAULT;
	err = dev->upload_effect(dev, &effect);
	if (put_user(effect.id, &(((struct ff_effect __user *)arg)->id)))
	return -EFAULT;
	return err;
	}
	else return -ENOSYS;

	case EVIOCRMFF:
	if (dev->erase_effect) {
	return dev->erase_effect(dev, (int)arg);
	}
	else return -ENOSYS;

	case EVIOCGEFFECTS:
	if (put_user(dev->ff_effects_max, ip))
	return -EFAULT;
	return 0;

	case EVIOCGRAB:
	if (arg) {
	if (evdev->grab)
	return -EBUSY;
	if (input_grab_device(&evdev->handle))
	return -EBUSY;
	evdev->grab = list;
	return 0;
	} else {
	if (evdev->grab != list)
	return -EINVAL;
	input_release_device(&evdev->handle);
	evdev->grab = NULL;
	return 0;
	}

	default:

	if (_IOC_TYPE(cmd) != 'E' \|\| _IOC_DIR(cmd) != _IOC_READ)
	return -EINVAL;

	if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {

	long *bits;
	int len;

	switch (_IOC_NR(cmd) & EV_MAX) {
	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;
	default: return -EINVAL;
	}
	len = NBITS(len) * sizeof(long);
	if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
	return copy_to_user(p, bits, len) ? -EFAULT : len;
	}

	if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) {
	int len;
	len = NBITS(KEY_MAX) * sizeof(long);
	if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
	return copy_to_user(p, dev->key, len) ? -EFAULT : len;
	}

	if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) {
	int len;
	len = NBITS(LED_MAX) * sizeof(long);
	if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
	return copy_to_user(p, dev->led, len) ? -EFAULT : len;
	}

	if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) {
	int len;
	len = NBITS(SND_MAX) * sizeof(long);
	if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
	return copy_to_user(p, dev->snd, len) ? -EFAULT : len;
	}

	if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) {
	int len;
	if (!dev->name) return -ENOENT;
	len = strlen(dev->name) + 1;
	if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
	return copy_to_user(p, dev->name, len) ? -EFAULT : len;
	}

	if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) {
	int len;
	if (!dev->phys) return -ENOENT;
	len = strlen(dev->phys) + 1;
	if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
	return copy_to_user(p, dev->phys, len) ? -EFAULT : len;
	}

	if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) {
	int len;
	if (!dev->uniq) return -ENOENT;
	len = strlen(dev->uniq) + 1;
	if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
	return copy_to_user(p, dev->uniq, len) ? -EFAULT : len;
	}

	if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {

	int t = _IOC_NR(cmd) & ABS_MAX;

	abs.value = dev->abs[t];
	abs.minimum = dev->absmin[t];
	abs.maximum = dev->absmax[t];
	abs.fuzz = dev->absfuzz[t];
	abs.flat = dev->absflat[t];

	if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
	return -EFAULT;

	return 0;
	}

	if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {

	int t = _IOC_NR(cmd) & ABS_MAX;

	if (copy_from_user(&abs, p, sizeof(struct input_absinfo)))
	return -EFAULT;

	dev->abs[t] = abs.value;
	dev->absmin[t] = abs.minimum;
	dev->absmax[t] = abs.maximum;
	dev->absfuzz[t] = abs.fuzz;
	dev->absflat[t] = abs.flat;

	return 0;
	}
	}
	return -EINVAL;
	}

	static struct file_operations evdev_fops = {
	.owner = THIS_MODULE,
	.read = evdev_read,
	.write = evdev_write,
	.poll = evdev_poll,
	.open = evdev_open,
	.release = evdev_release,
	.ioctl = evdev_ioctl,
	.fasync = evdev_fasync,
	.flush = evdev_flush
	};

	static struct input_handle evdev_connect(struct input_handler handler, struct input_dev dev, struct input_device_id id)
	{
	struct evdev *evdev;
	int minor;

	for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++);
	if (minor == EVDEV_MINORS) {
	printk(KERN_ERR "evdev: no more free evdev devices\n");
	return NULL;
	}

	if (!(evdev = kmalloc(sizeof(struct evdev), GFP_KERNEL)))
	return NULL;
	memset(evdev, 0, sizeof(struct evdev));

	INIT_LIST_HEAD(&evdev->list);
	init_waitqueue_head(&evdev->wait);

	evdev->exist = 1;
	evdev->minor = minor;
	evdev->handle.dev = dev;
	evdev->handle.name = evdev->name;
	evdev->handle.handler = handler;
	evdev->handle.private = evdev;
	sprintf(evdev->name, "event%d", minor);

	evdev_table[minor] = evdev;

	devfs_mk_cdev(MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
	S_IFCHR\|S_IRUGO\|S_IWUSR, "input/event%d", minor);
	class_device_create(input_class,
	MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
	dev->dev, "event%d", minor);

	return &evdev->handle;
	}

	static void evdev_disconnect(struct input_handle *handle)
	{
	struct evdev *evdev = handle->private;
	struct evdev_list *list;

	class_device_destroy(input_class,
	MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + evdev->minor));
	devfs_remove("input/event%d", evdev->minor);
	evdev->exist = 0;

	if (evdev->open) {
	input_close_device(handle);
	wake_up_interruptible(&evdev->wait);
	list_for_each_entry(list, &evdev->list, node)
	kill_fasync(&list->fasync, SIGIO, POLL_HUP);
	} else
	evdev_free(evdev);
	}

	static 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)
	{
	input_register_handler(&evdev_handler);
	return 0;
	}

	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");