[mirror_ubuntu-artful-kernel.git] / drivers / input / evdev.c

/*
 * 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/compat.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;
}

#ifdef CONFIG_COMPAT

struct input_event_compat {
	struct compat_timeval time;
	__u16 type;
	__u16 code;
	__s32 value;
};

/* Note to the author of this code: did it ever occur to
   you why the ifdefs are needed? Think about it again. -AK */
#ifdef CONFIG_X86_64
#  define COMPAT_TEST is_compat_task()
#elif defined(CONFIG_IA64)
#  define COMPAT_TEST IS_IA32_PROCESS(ia64_task_regs(current))
#elif defined(CONFIG_S390)
#  define COMPAT_TEST test_thread_flag(TIF_31BIT)
#elif defined(CONFIG_MIPS)
#  define COMPAT_TEST (current->thread.mflags & MF_32BIT_ADDR)
#else
#  define COMPAT_TEST test_thread_flag(TIF_32BIT)
#endif

static inline size_t evdev_event_size(void)
{
	return COMPAT_TEST ?
		sizeof(struct input_event_compat) : sizeof(struct input_event);
}

static int evdev_event_from_user(const char __user *buffer, struct input_event *event)
{
	if (COMPAT_TEST) {
		struct input_event_compat compat_event;

		if (copy_from_user(&compat_event, buffer, sizeof(struct input_event_compat)))
			return -EFAULT;

		event->time.tv_sec = compat_event.time.tv_sec;
		event->time.tv_usec = compat_event.time.tv_usec;
		event->type = compat_event.type;
		event->code = compat_event.code;
		event->value = compat_event.value;

	} else {
		if (copy_from_user(event, buffer, sizeof(struct input_event)))
			return -EFAULT;
	}

	return 0;
}

static int evdev_event_to_user(char __user *buffer, const struct input_event *event)
{
	if (COMPAT_TEST) {
		struct input_event_compat compat_event;

		compat_event.time.tv_sec = event->time.tv_sec;
		compat_event.time.tv_usec = event->time.tv_usec;
		compat_event.type = event->type;
		compat_event.code = event->code;
		compat_event.value = event->value;

		if (copy_to_user(buffer, &compat_event, sizeof(struct input_event_compat)))
			return -EFAULT;

	} else {
		if (copy_to_user(buffer, event, sizeof(struct input_event)))
			return -EFAULT;
	}

	return 0;
}

#else

static inline size_t evdev_event_size(void)
{
	return sizeof(struct input_event);
}

static int evdev_event_from_user(const char __user *buffer, struct input_event *event)
{
	if (copy_from_user(event, buffer, sizeof(struct input_event)))
		return -EFAULT;

	return 0;
}

static int evdev_event_to_user(char __user *buffer, const struct input_event *event)
{
	if (copy_to_user(buffer, event, sizeof(struct input_event)))
		return -EFAULT;

	return 0;
}

#endif /* CONFIG_COMPAT */

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

	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 < evdev_event_size())
		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 + evdev_event_size() <= count) {

		struct input_event *event = (struct input_event *) list->buffer + list->tail;

		if (evdev_event_to_user(buffer + retval, event))
			return -EFAULT;

		list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
		retval += evdev_event_size();
	}

	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));
}

#ifdef CONFIG_COMPAT

#define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
#define NBITS_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 = NBITS_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 = NBITS(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 ?
			NBITS_COMPAT(maxbit) * sizeof(compat_long_t) :
			NBITS(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 = NBITS(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;
}

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

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

	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 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;
			if (dev->keycodesize < sizeof(v) && (v >> (dev->keycodesize * 8)))
				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 *)p)->id)))
					return -EFAULT;
				return err;
			} else
				return -ENOSYS;

		case EVIOCRMFF:
			if (!dev->erase_effect)
				return -ENOSYS;

			return dev->erase_effect(dev, (int)(unsigned long) p);

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

		case EVIOCGRAB:
			if (p) {
				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')
				return -EINVAL;

			if (_IOC_DIR(cmd) == _IOC_READ) {

				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;
						case EV_SW:  bits = dev->swbit;  len = SW_MAX;  break;
						default: return -EINVAL;
					}
					return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode);
				}

				if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0)))
					return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd),
							    p, compat_mode);

				if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0)))
					return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd),
							    p, compat_mode);

				if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0)))
					return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd),
							    p, compat_mode);

				if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0)))
					return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd),
							    p, compat_mode);

				if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0)))
					return str_to_user(dev->name, _IOC_SIZE(cmd), p);

				if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0)))
					return str_to_user(dev->phys, _IOC_SIZE(cmd), p);

				if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0)))
					return str_to_user(dev->uniq, _IOC_SIZE(cmd), p);

				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_DIR(cmd) == _IOC_WRITE) {

				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 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 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
};

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

	cdev = class_device_create(&input_class, &dev->cdev,
			MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
			dev->cdev.dev, evdev->name);

	/* temporary symlink to keep userspace happy */
	sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj,
			  evdev->name);

	return &evdev->handle;
}

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

	sysfs_remove_link(&input_class.subsys.kset.kobj, evdev->name);
	class_device_destroy(&input_class,
			MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + 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");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Event char devices, giving access to raw input device events.
	3	*
	4	* Copyright (c) 1999-2002 Vojtech Pavlik
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License version 2 as published by
	8	* the Free Software Foundation.
	9	*/
	10
	11	#define EVDEV_MINOR_BASE 64
	12	#define EVDEV_MINORS 32
	13	#define EVDEV_BUFFER_SIZE 64
	14
	15	#include <linux/poll.h>
	16	#include <linux/slab.h>
	17	#include <linux/module.h>
	18	#include <linux/init.h>
	19	#include <linux/input.h>
	20	#include <linux/major.h>
	21	#include <linux/smp_lock.h>
	22	#include <linux/device.h>
52658bb6	23	#include <linux/compat.h>
1da177e4 LT	24
	25	struct evdev {
	26	int exist;
	27	int open;
	28	int minor;
	29	char name[16];
	30	struct input_handle handle;
	31	wait_queue_head_t wait;
	32	struct evdev_list *grab;
	33	struct list_head list;
	34	};
	35
	36	struct evdev_list {
	37	struct input_event buffer[EVDEV_BUFFER_SIZE];
	38	int head;
	39	int tail;
	40	struct fasync_struct *fasync;
	41	struct evdev *evdev;
	42	struct list_head node;
	43	};
	44
	45	static struct evdev *evdev_table[EVDEV_MINORS];
	46
	47	static void evdev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
	48	{
	49	struct evdev *evdev = handle->private;
	50	struct evdev_list *list;
	51
	52	if (evdev->grab) {
	53	list = evdev->grab;
	54
	55	do_gettimeofday(&list->buffer[list->head].time);
	56	list->buffer[list->head].type = type;
	57	list->buffer[list->head].code = code;
	58	list->buffer[list->head].value = value;
	59	list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1);
	60
	61	kill_fasync(&list->fasync, SIGIO, POLL_IN);
	62	} else
	63	list_for_each_entry(list, &evdev->list, node) {
	64
	65	do_gettimeofday(&list->buffer[list->head].time);
	66	list->buffer[list->head].type = type;
	67	list->buffer[list->head].code = code;
	68	list->buffer[list->head].value = value;
	69	list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1);
	70
	71	kill_fasync(&list->fasync, SIGIO, POLL_IN);
	72	}
	73
	74	wake_up_interruptible(&evdev->wait);
	75	}
	76
	77	static int evdev_fasync(int fd, struct file *file, int on)
	78	{
	79	int retval;
	80	struct evdev_list *list = file->private_data;
	81	retval = fasync_helper(fd, file, on, &list->fasync);
	82	return retval < 0 ? retval : 0;
	83	}
	84
	85	static int evdev_flush(struct file * file)
	86	{
	87	struct evdev_list *list = file->private_data;
88	if (!list->evdev->exist) return -ENODEV;
89	return input_flush_device(&list->evdev->handle, file);
90	}
91
92	static void evdev_free(struct evdev *evdev)
93	{
94	evdev_table[evdev->minor] = NULL;
95	kfree(evdev);
96	}
97
98	static int evdev_release(struct inode * inode, struct file * file)
99	{
100	struct evdev_list *list = file->private_data;
101
102	if (list->evdev->grab == list) {
103	input_release_device(&list->evdev->handle);
104	list->evdev->grab = NULL;
105	}
106
107	evdev_fasync(-1, file, 0);
108	list_del(&list->node);
109
110	if (!--list->evdev->open) {
111	if (list->evdev->exist)
112	input_close_device(&list->evdev->handle);
113	else
114	evdev_free(list->evdev);
115	}
116
117	kfree(list);
118	return 0;
119	}
120
121	static int evdev_open(struct inode * inode, struct file * file)
122	{
123	struct evdev_list *list;
124	int i = iminor(inode) - EVDEV_MINOR_BASE;
125	int accept_err;
126
127	if (i >= EVDEV_MINORS \|\| !evdev_table[i] \|\| !evdev_table[i]->exist)
128	return -ENODEV;
129
130	if ((accept_err = input_accept_process(&(evdev_table[i]->handle), file)))
131	return accept_err;
132
133	if (!(list = kmalloc(sizeof(struct evdev_list), GFP_KERNEL)))
134	return -ENOMEM;
135	memset(list, 0, sizeof(struct evdev_list));
136
137	list->evdev = evdev_table[i];
138	list_add_tail(&list->node, &evdev_table[i]->list);
139	file->private_data = list;
140
141	if (!list->evdev->open++)
142	if (list->evdev->exist)
143	input_open_device(&list->evdev->handle);
144
145	return 0;
146	}
147
52658bb6	148	#ifdef CONFIG_COMPAT
3a51f7c4	149
52658bb6 JK	150	struct input_event_compat {
	151	struct compat_timeval time;
	152	__u16 type;
	153	__u16 code;
	154	__s32 value;
	155	};
	156
bf2fcc6f AK	157	/* Note to the author of this code: did it ever occur to
bf2fcc6f AK	158	you why the ifdefs are needed? Think about it again. -AK */
52658bb6	159	#ifdef CONFIG_X86_64
bf2fcc6f	160	# define COMPAT_TEST is_compat_task()
52658bb6 JK	161	#elif defined(CONFIG_IA64)
52658bb6 JK	162	# define COMPAT_TEST IS_IA32_PROCESS(ia64_task_regs(current))
347a8dc3	163	#elif defined(CONFIG_S390)
52658bb6	164	# define COMPAT_TEST test_thread_flag(TIF_31BIT)
59df6bbf RB	165	#elif defined(CONFIG_MIPS)
59df6bbf RB	166	# define COMPAT_TEST (current->thread.mflags & MF_32BIT_ADDR)
52658bb6 JK	167	#else
	168	# define COMPAT_TEST test_thread_flag(TIF_32BIT)
	169	#endif
	170
3a51f7c4	171	static inline size_t evdev_event_size(void)
52658bb6	172	{
3a51f7c4 DT	173	return COMPAT_TEST ?
	174	sizeof(struct input_event_compat) : sizeof(struct input_event);
	175	}
52658bb6	176
3a51f7c4 DT	177	static int evdev_event_from_user(const char __user buffer, struct input_event event)
	178	{
	179	if (COMPAT_TEST) {
	180	struct input_event_compat compat_event;
	181
	182	if (copy_from_user(&compat_event, buffer, sizeof(struct input_event_compat)))
	183	return -EFAULT;
	184
	185	event->time.tv_sec = compat_event.time.tv_sec;
	186	event->time.tv_usec = compat_event.time.tv_usec;
	187	event->type = compat_event.type;
	188	event->code = compat_event.code;
	189	event->value = compat_event.value;
	190
	191	} else {
	192	if (copy_from_user(event, buffer, sizeof(struct input_event)))
52658bb6	193	return -EFAULT;
52658bb6 JK	194	}
52658bb6 JK	195
3a51f7c4	196	return 0;
52658bb6	197	}
52658bb6	198
3a51f7c4	199	static int evdev_event_to_user(char __user buffer, const struct input_event event)
1da177e4	200	{
3a51f7c4 DT	201	if (COMPAT_TEST) {
3a51f7c4 DT	202	struct input_event_compat compat_event;
1da177e4	203
3a51f7c4 DT	204	compat_event.time.tv_sec = event->time.tv_sec;
	205	compat_event.time.tv_usec = event->time.tv_usec;
	206	compat_event.type = event->type;
	207	compat_event.code = event->code;
	208	compat_event.value = event->value;
52658bb6	209
3a51f7c4 DT	210	if (copy_to_user(buffer, &compat_event, sizeof(struct input_event_compat)))
3a51f7c4 DT	211	return -EFAULT;
1da177e4	212
3a51f7c4 DT	213	} else {
3a51f7c4 DT	214	if (copy_to_user(buffer, event, sizeof(struct input_event)))
1da177e4	215	return -EFAULT;
1da177e4 LT	216	}
1da177e4 LT	217
3a51f7c4	218	return 0;
1da177e4 LT	219	}
1da177e4 LT	220
3a51f7c4 DT	221	#else
	222
	223	static inline size_t evdev_event_size(void)
52658bb6	224	{
3a51f7c4 DT	225	return sizeof(struct input_event);
3a51f7c4 DT	226	}
52658bb6	227
3a51f7c4 DT	228	static int evdev_event_from_user(const char __user buffer, struct input_event event)
	229	{
	230	if (copy_from_user(event, buffer, sizeof(struct input_event)))
	231	return -EFAULT;
52658bb6	232
3a51f7c4 DT	233	return 0;
3a51f7c4 DT	234	}
52658bb6	235
3a51f7c4 DT	236	static int evdev_event_to_user(char __user buffer, const struct input_event event)
	237	{
	238	if (copy_to_user(buffer, event, sizeof(struct input_event)))
	239	return -EFAULT;
52658bb6	240
3a51f7c4 DT	241	return 0;
	242	}
	243
	244	#endif /* CONFIG_COMPAT */
	245
	246	static ssize_t evdev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
	247	{
	248	struct evdev_list *list = file->private_data;
	249	struct input_event event;
	250	int retval = 0;
52658bb6 JK	251
	252	if (!list->evdev->exist)
	253	return -ENODEV;
	254
3a51f7c4 DT	255	while (retval < count) {
	256
	257	if (evdev_event_from_user(buffer + retval, &event))
	258	return -EFAULT;
	259	input_event(list->evdev->handle.dev, event.type, event.code, event.value);
	260	retval += evdev_event_size();
52658bb6 JK	261	}
	262
	263	return retval;
	264	}
52658bb6	265
1da177e4 LT	266	static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
	267	{
	268	struct evdev_list *list = file->private_data;
	269	int retval;
	270
3a51f7c4	271	if (count < evdev_event_size())
1da177e4 LT	272	return -EINVAL;
	273
	274	if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK))
	275	return -EAGAIN;
	276
	277	retval = wait_event_interruptible(list->evdev->wait,
	278	list->head != list->tail \|\| (!list->evdev->exist));
	279
	280	if (retval)
	281	return retval;
	282
	283	if (!list->evdev->exist)
	284	return -ENODEV;
	285
3a51f7c4 DT	286	while (list->head != list->tail && retval + evdev_event_size() <= count) {
	287
	288	struct input_event event = (struct input_event ) list->buffer + list->tail;
	289
	290	if (evdev_event_to_user(buffer + retval, event))
	291	return -EFAULT;
	292
1da177e4	293	list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
3a51f7c4	294	retval += evdev_event_size();
1da177e4 LT	295	}
	296
	297	return retval;
	298	}
	299
	300	/* No kernel lock - fine */
	301	static unsigned int evdev_poll(struct file file, poll_table wait)
	302	{
	303	struct evdev_list *list = file->private_data;
	304	poll_wait(file, &list->evdev->wait, wait);
	305	return ((list->head == list->tail) ? 0 : (POLLIN \| POLLRDNORM)) \|
	306	(list->evdev->exist ? 0 : (POLLHUP \| POLLERR));
	307	}
	308
3a51f7c4 DT	309	#ifdef CONFIG_COMPAT
	310
	311	#define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
	312	#define NBITS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1)
	313
	314	#ifdef __BIG_ENDIAN
	315	static int bits_to_user(unsigned long *bits, unsigned int maxbit,
	316	unsigned int maxlen, void __user *p, int compat)
	317	{
	318	int len, i;
	319
	320	if (compat) {
	321	len = NBITS_COMPAT(maxbit) * sizeof(compat_long_t);
	322	if (len < maxlen)
	323	len = maxlen;
	324
	325	for (i = 0; i < len / sizeof(compat_long_t); i++)
	326	if (copy_to_user((compat_long_t __user *) p + i,
	327	(compat_long_t *) bits +
	328	i + 1 - ((i % 2) << 1),
	329	sizeof(compat_long_t)))
	330	return -EFAULT;
	331	} else {
	332	len = NBITS(maxbit) * sizeof(long);
	333	if (len > maxlen)
	334	len = maxlen;
	335
	336	if (copy_to_user(p, bits, len))
	337	return -EFAULT;
	338	}
	339
	340	return len;
	341	}
	342	#else
	343	static int bits_to_user(unsigned long *bits, unsigned int maxbit,
	344	unsigned int maxlen, void __user *p, int compat)
	345	{
	346	int len = compat ?
	347	NBITS_COMPAT(maxbit) * sizeof(compat_long_t) :
	348	NBITS(maxbit) * sizeof(long);
	349
	350	if (len > maxlen)
	351	len = maxlen;
	352
	353	return copy_to_user(p, bits, len) ? -EFAULT : len;
	354	}
	355	#endif /* __BIG_ENDIAN */
	356
	357	#else
	358
	359	static int bits_to_user(unsigned long *bits, unsigned int maxbit,
	360	unsigned int maxlen, void __user *p, int compat)
	361	{
	362	int len = NBITS(maxbit) * sizeof(long);
	363
	364	if (len > maxlen)
	365	len = maxlen;
	366
	367	return copy_to_user(p, bits, len) ? -EFAULT : len;
	368	}
	369
	370	#endif /* CONFIG_COMPAT */
	371
	372	static int str_to_user(const char str, unsigned int maxlen, void __user p)
373	{
374	int len;
375
376	if (!str)
377	return -ENOENT;
378
379	len = strlen(str) + 1;
380	if (len > maxlen)
381	len = maxlen;
382
383	return copy_to_user(p, str, len) ? -EFAULT : len;
384	}
385
386	static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
387	void __user *p, int compat_mode)
1da177e4 LT	388	{
	389	struct evdev_list *list = file->private_data;
	390	struct evdev *evdev = list->evdev;
	391	struct input_dev *dev = evdev->handle.dev;
	392	struct input_absinfo abs;
3a51f7c4	393	int __user ip = (int __user )p;
1da177e4 LT	394	int i, t, u, v;
1da177e4 LT	395
3a51f7c4 DT	396	if (!evdev->exist)
3a51f7c4 DT	397	return -ENODEV;
1da177e4 LT	398
	399	switch (cmd) {
	400
	401	case EVIOCGVERSION:
	402	return put_user(EV_VERSION, ip);
	403
	404	case EVIOCGID:
3a51f7c4 DT	405	if (copy_to_user(p, &dev->id, sizeof(struct input_id)))
	406	return -EFAULT;
	407
	408	return 0;
1da177e4 LT	409
1da177e4 LT	410	case EVIOCGKEYCODE:
3a51f7c4 DT	411	if (get_user(t, ip))
	412	return -EFAULT;
	413	if (t < 0 \|\| t >= dev->keycodemax \|\| !dev->keycodesize)
	414	return -EINVAL;
	415	if (put_user(INPUT_KEYCODE(dev, t), ip + 1))
	416	return -EFAULT;
1da177e4 LT	417	return 0;
	418
	419	case EVIOCSKEYCODE:
3a51f7c4 DT	420	if (get_user(t, ip))
	421	return -EFAULT;
	422	if (t < 0 \|\| t >= dev->keycodemax \|\| !dev->keycodesize)
	423	return -EINVAL;
	424	if (get_user(v, ip + 1))
	425	return -EFAULT;
	426	if (v < 0 \|\| v > KEY_MAX)
	427	return -EINVAL;
	428	if (dev->keycodesize < sizeof(v) && (v >> (dev->keycodesize * 8)))
	429	return -EINVAL;
	430
1da177e4 LT	431	u = SET_INPUT_KEYCODE(dev, t, v);
	432	clear_bit(u, dev->keybit);
	433	set_bit(v, dev->keybit);
	434	for (i = 0; i < dev->keycodemax; i++)
3a51f7c4	435	if (INPUT_KEYCODE(dev, i) == u)
1da177e4	436	set_bit(u, dev->keybit);
3a51f7c4	437
1da177e4 LT	438	return 0;
	439
	440	case EVIOCSFF:
	441	if (dev->upload_effect) {
	442	struct ff_effect effect;
	443	int err;
	444
	445	if (copy_from_user(&effect, p, sizeof(effect)))
	446	return -EFAULT;
	447	err = dev->upload_effect(dev, &effect);
3a51f7c4	448	if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
1da177e4 LT	449	return -EFAULT;
1da177e4 LT	450	return err;
3a51f7c4 DT	451	} else
3a51f7c4 DT	452	return -ENOSYS;
1da177e4 LT	453
1da177e4 LT	454	case EVIOCRMFF:
3a51f7c4 DT	455	if (!dev->erase_effect)
	456	return -ENOSYS;
	457
	458	return dev->erase_effect(dev, (int)(unsigned long) p);
1da177e4 LT	459
	460	case EVIOCGEFFECTS:
	461	if (put_user(dev->ff_effects_max, ip))
	462	return -EFAULT;
	463	return 0;
	464
	465	case EVIOCGRAB:
3a51f7c4	466	if (p) {
1da177e4 LT	467	if (evdev->grab)
	468	return -EBUSY;
	469	if (input_grab_device(&evdev->handle))
	470	return -EBUSY;
	471	evdev->grab = list;
	472	return 0;
	473	} else {
	474	if (evdev->grab != list)
	475	return -EINVAL;
	476	input_release_device(&evdev->handle);
	477	evdev->grab = NULL;
	478	return 0;
	479	}
	480
	481	default:
	482
41e979f8	483	if (_IOC_TYPE(cmd) != 'E')
1da177e4 LT	484	return -EINVAL;
1da177e4 LT	485
41e979f8 VP	486	if (_IOC_DIR(cmd) == _IOC_READ) {
	487
	488	if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {
	489
	490	long *bits;
	491	int len;
	492
	493	switch (_IOC_NR(cmd) & EV_MAX) {
	494	case 0: bits = dev->evbit; len = EV_MAX; break;
	495	case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
	496	case EV_REL: bits = dev->relbit; len = REL_MAX; break;
	497	case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
	498	case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
	499	case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
	500	case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
	501	case EV_FF: bits = dev->ffbit; len = FF_MAX; break;
31581066	502	case EV_SW: bits = dev->swbit; len = SW_MAX; break;
41e979f8 VP	503	default: return -EINVAL;
41e979f8 VP	504	}
3a51f7c4	505	return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode);
1da177e4	506	}
1da177e4	507
3a51f7c4 DT	508	if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0)))
	509	return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd),
	510	p, compat_mode);
1da177e4	511
3a51f7c4 DT	512	if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0)))
	513	return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd),
	514	p, compat_mode);
1da177e4	515
3a51f7c4 DT	516	if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0)))
	517	return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd),
	518	p, compat_mode);
1da177e4	519
3a51f7c4 DT	520	if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0)))
	521	return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd),
	522	p, compat_mode);
31581066	523
3a51f7c4 DT	524	if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0)))
3a51f7c4 DT	525	return str_to_user(dev->name, _IOC_SIZE(cmd), p);
1da177e4	526
3a51f7c4 DT	527	if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0)))
3a51f7c4 DT	528	return str_to_user(dev->phys, _IOC_SIZE(cmd), p);
1da177e4	529
3a51f7c4 DT	530	if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0)))
3a51f7c4 DT	531	return str_to_user(dev->uniq, _IOC_SIZE(cmd), p);
1da177e4	532
41e979f8	533	if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
1da177e4	534
41e979f8	535	int t = _IOC_NR(cmd) & ABS_MAX;
1da177e4	536
41e979f8 VP	537	abs.value = dev->abs[t];
	538	abs.minimum = dev->absmin[t];
	539	abs.maximum = dev->absmax[t];
	540	abs.fuzz = dev->absfuzz[t];
	541	abs.flat = dev->absflat[t];
1da177e4	542
41e979f8 VP	543	if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
	544	return -EFAULT;
	545
	546	return 0;
	547	}
1da177e4	548
1da177e4 LT	549	}
1da177e4 LT	550
41e979f8	551	if (_IOC_DIR(cmd) == _IOC_WRITE) {
1da177e4	552
41e979f8	553	if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
1da177e4	554
41e979f8 VP	555	int t = _IOC_NR(cmd) & ABS_MAX;
	556
	557	if (copy_from_user(&abs, p, sizeof(struct input_absinfo)))
	558	return -EFAULT;
1da177e4	559
41e979f8 VP	560	dev->abs[t] = abs.value;
	561	dev->absmin[t] = abs.minimum;
	562	dev->absmax[t] = abs.maximum;
	563	dev->absfuzz[t] = abs.fuzz;
	564	dev->absflat[t] = abs.flat;
1da177e4	565
41e979f8 VP	566	return 0;
41e979f8 VP	567	}
1da177e4	568	}
1da177e4 LT	569	}
	570	return -EINVAL;
	571	}
1da177e4	572
3a51f7c4 DT	573	static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	574	{
	575	return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);
	576	}
41e979f8	577
3a51f7c4	578	#ifdef CONFIG_COMPAT
52658bb6 JK	579	static long evdev_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
52658bb6 JK	580	{
3a51f7c4	581	return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1);
1da177e4	582	}
52658bb6	583	#endif
1da177e4 LT	584
	585	static struct file_operations evdev_fops = {
	586	.owner = THIS_MODULE,
	587	.read = evdev_read,
	588	.write = evdev_write,
	589	.poll = evdev_poll,
	590	.open = evdev_open,
	591	.release = evdev_release,
52658bb6 JK	592	.unlocked_ioctl = evdev_ioctl,
	593	#ifdef CONFIG_COMPAT
	594	.compat_ioctl = evdev_ioctl_compat,
	595	#endif
1da177e4 LT	596	.fasync = evdev_fasync,
	597	.flush = evdev_flush
	598	};
	599
	600	static struct input_handle evdev_connect(struct input_handler handler, struct input_dev dev, struct input_device_id id)
	601	{
	602	struct evdev *evdev;
c9bcd582	603	struct class_device *cdev;
1da177e4 LT	604	int minor;
	605
	606	for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++);
	607	if (minor == EVDEV_MINORS) {
	608	printk(KERN_ERR "evdev: no more free evdev devices\n");
	609	return NULL;
	610	}
	611
	612	if (!(evdev = kmalloc(sizeof(struct evdev), GFP_KERNEL)))
	613	return NULL;
	614	memset(evdev, 0, sizeof(struct evdev));
	615
	616	INIT_LIST_HEAD(&evdev->list);
	617	init_waitqueue_head(&evdev->wait);
	618
	619	evdev->exist = 1;
	620	evdev->minor = minor;
	621	evdev->handle.dev = dev;
	622	evdev->handle.name = evdev->name;
	623	evdev->handle.handler = handler;
	624	evdev->handle.private = evdev;
	625	sprintf(evdev->name, "event%d", minor);
	626
	627	evdev_table[minor] = evdev;
	628
c9bcd582	629	cdev = class_device_create(&input_class, &dev->cdev,
1235686f	630	MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
c9bcd582 GKH	631	dev->cdev.dev, evdev->name);
	632
	633	/* temporary symlink to keep userspace happy */
	634	sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj,
	635	evdev->name);
1da177e4 LT	636
	637	return &evdev->handle;
	638	}
	639
	640	static void evdev_disconnect(struct input_handle *handle)
	641	{
	642	struct evdev *evdev = handle->private;
	643	struct evdev_list *list;
	644
c9bcd582	645	sysfs_remove_link(&input_class.subsys.kset.kobj, evdev->name);
ea9f240b	646	class_device_destroy(&input_class,
1235686f	647	MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + evdev->minor));
1da177e4 LT	648	evdev->exist = 0;
	649
	650	if (evdev->open) {
	651	input_close_device(handle);
	652	wake_up_interruptible(&evdev->wait);
	653	list_for_each_entry(list, &evdev->list, node)
	654	kill_fasync(&list->fasync, SIGIO, POLL_HUP);
	655	} else
	656	evdev_free(evdev);
	657	}
	658
	659	static struct input_device_id evdev_ids[] = {
	660	{ .driver_info = 1 }, /* Matches all devices */
	661	{ }, /* Terminating zero entry */
	662	};
	663
	664	MODULE_DEVICE_TABLE(input, evdev_ids);
	665
	666	static struct input_handler evdev_handler = {
	667	.event = evdev_event,
	668	.connect = evdev_connect,
	669	.disconnect = evdev_disconnect,
	670	.fops = &evdev_fops,
	671	.minor = EVDEV_MINOR_BASE,
	672	.name = "evdev",
	673	.id_table = evdev_ids,
	674	};
	675
	676	static int __init evdev_init(void)
	677	{
	678	input_register_handler(&evdev_handler);
	679	return 0;
	680	}
	681
	682	static void __exit evdev_exit(void)
	683	{
	684	input_unregister_handler(&evdev_handler);
	685	}
	686
	687	module_init(evdev_init);
	688	module_exit(evdev_exit);
	689
	690	MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
	691	MODULE_DESCRIPTION("Input driver event char devices");
	692	MODULE_LICENSE("GPL");