[deliverable/linux.git] / drivers / input / misc / uinput.c

/*
 *  User level driver support for input subsystem
 *
 * Heavily based on evdev.c by Vojtech Pavlik
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Author: Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org>
 *
 * Changes/Revisions:
 *	0.3	09/04/2006 (Anssi Hannula <anssi.hannula@gmail.com>)
 *		- updated ff support for the changes in kernel interface
 *		- added MODULE_VERSION
 *	0.2	16/10/2004 (Micah Dowty <micah@navi.cx>)
 *		- added force feedback support
 *              - added UI_SET_PHYS
 *	0.1	20/06/2002
 *		- first public version
 */
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/smp_lock.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/uinput.h>

static int uinput_dev_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
{
	struct uinput_device	*udev;

	udev = dev->private;

	udev->buff[udev->head].type = type;
	udev->buff[udev->head].code = code;
	udev->buff[udev->head].value = value;
	do_gettimeofday(&udev->buff[udev->head].time);
	udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE;

	wake_up_interruptible(&udev->waitq);

	return 0;
}

static int uinput_request_alloc_id(struct uinput_device *udev, struct uinput_request *request)
{
	/* Atomically allocate an ID for the given request. Returns 0 on success. */
	int id;
	int err = -1;

	spin_lock(&udev->requests_lock);

	for (id = 0; id < UINPUT_NUM_REQUESTS; id++)
		if (!udev->requests[id]) {
			request->id = id;
			udev->requests[id] = request;
			err = 0;
			break;
		}

	spin_unlock(&udev->requests_lock);
	return err;
}

static struct uinput_request* uinput_request_find(struct uinput_device *udev, int id)
{
	/* Find an input request, by ID. Returns NULL if the ID isn't valid. */
	if (id >= UINPUT_NUM_REQUESTS || id < 0)
		return NULL;
	return udev->requests[id];
}

static inline int uinput_request_reserve_slot(struct uinput_device *udev, struct uinput_request *request)
{
	/* Allocate slot. If none are available right away, wait. */
	return wait_event_interruptible(udev->requests_waitq,
					!uinput_request_alloc_id(udev, request));
}

static void uinput_request_done(struct uinput_device *udev, struct uinput_request *request)
{
	/* Mark slot as available */
	udev->requests[request->id] = NULL;
	wake_up(&udev->requests_waitq);

	complete(&request->done);
}

static int uinput_request_submit(struct input_dev *dev, struct uinput_request *request)
{
	/* Tell our userspace app about this new request by queueing an input event */
	uinput_dev_event(dev, EV_UINPUT, request->code, request->id);

	/* Wait for the request to complete */
	wait_for_completion(&request->done);
	return request->retval;
}

static void uinput_dev_set_gain(struct input_dev *dev, u16 gain)
{
	uinput_dev_event(dev, EV_FF, FF_GAIN, gain);
}

static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude)
{
	uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude);
}

static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value)
{
	return uinput_dev_event(dev, EV_FF, effect_id, value);
}

static int uinput_dev_upload_effect(struct input_dev *dev, struct ff_effect *effect, struct ff_effect *old)
{
	struct uinput_request request;
	int retval;

	request.id = -1;
	init_completion(&request.done);
	request.code = UI_FF_UPLOAD;
	request.u.upload.effect = effect;
	request.u.upload.old = old;

	retval = uinput_request_reserve_slot(dev->private, &request);
	if (!retval)
		retval = uinput_request_submit(dev, &request);

	return retval;
}

static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id)
{
	struct uinput_request request;
	int retval;

	if (!test_bit(EV_FF, dev->evbit))
		return -ENOSYS;

	request.id = -1;
	init_completion(&request.done);
	request.code = UI_FF_ERASE;
	request.u.effect_id = effect_id;

	retval = uinput_request_reserve_slot(dev->private, &request);
	if (!retval)
		retval = uinput_request_submit(dev, &request);

	return retval;
}

static void uinput_destroy_device(struct uinput_device *udev)
{
	const char *name, *phys;

	if (udev->dev) {
		name = udev->dev->name;
		phys = udev->dev->phys;
		if (udev->state == UIST_CREATED)
			input_unregister_device(udev->dev);
		else
			input_free_device(udev->dev);
		kfree(name);
		kfree(phys);
		udev->dev = NULL;
	}

	udev->state = UIST_NEW_DEVICE;
}

static int uinput_create_device(struct uinput_device *udev)
{
	struct input_dev *dev = udev->dev;
	int error;

	if (udev->state != UIST_SETUP_COMPLETE) {
		printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
		return -EINVAL;
	}

	if (udev->ff_effects_max) {
		error = input_ff_create(dev, udev->ff_effects_max);
		if (error)
			goto fail1;

		dev->ff->upload = uinput_dev_upload_effect;
		dev->ff->erase = uinput_dev_erase_effect;
		dev->ff->playback = uinput_dev_playback;
		dev->ff->set_gain = uinput_dev_set_gain;
		dev->ff->set_autocenter = uinput_dev_set_autocenter;
	}

	error = input_register_device(udev->dev);
	if (error)
		goto fail2;

	udev->state = UIST_CREATED;

	return 0;

 fail2:	input_ff_destroy(dev);
 fail1: uinput_destroy_device(udev);
	return error;
}

static int uinput_open(struct inode *inode, struct file *file)
{
	struct uinput_device *newdev;

	newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL);
	if (!newdev)
		return -ENOMEM;

	mutex_init(&newdev->mutex);
	spin_lock_init(&newdev->requests_lock);
	init_waitqueue_head(&newdev->requests_waitq);
	init_waitqueue_head(&newdev->waitq);
	newdev->state = UIST_NEW_DEVICE;

	file->private_data = newdev;

	return 0;
}

static int uinput_validate_absbits(struct input_dev *dev)
{
	unsigned int cnt;
	int retval = 0;

	for (cnt = 0; cnt < ABS_MAX + 1; cnt++) {
		if (!test_bit(cnt, dev->absbit))
			continue;

		if ((dev->absmax[cnt] <= dev->absmin[cnt])) {
			printk(KERN_DEBUG
				"%s: invalid abs[%02x] min:%d max:%d\n",
				UINPUT_NAME, cnt,
				dev->absmin[cnt], dev->absmax[cnt]);
			retval = -EINVAL;
			break;
		}

		if (dev->absflat[cnt] > (dev->absmax[cnt] - dev->absmin[cnt])) {
			printk(KERN_DEBUG
				"%s: absflat[%02x] out of range: %d "
				"(min:%d/max:%d)\n",
				UINPUT_NAME, cnt, dev->absflat[cnt],
				dev->absmin[cnt], dev->absmax[cnt]);
			retval = -EINVAL;
			break;
		}
	}
	return retval;
}

static int uinput_allocate_device(struct uinput_device *udev)
{
	udev->dev = input_allocate_device();
	if (!udev->dev)
		return -ENOMEM;

	udev->dev->event = uinput_dev_event;
	udev->dev->private = udev;

	return 0;
}

static int uinput_setup_device(struct uinput_device *udev, const char __user *buffer, size_t count)
{
	struct uinput_user_dev	*user_dev;
	struct input_dev	*dev;
	char			*name;
	int			size;
	int			retval;

	if (count != sizeof(struct uinput_user_dev))
		return -EINVAL;

	if (!udev->dev) {
		retval = uinput_allocate_device(udev);
		if (retval)
			return retval;
	}

	dev = udev->dev;

	user_dev = kmalloc(sizeof(struct uinput_user_dev), GFP_KERNEL);
	if (!user_dev)
		return -ENOMEM;

	if (copy_from_user(user_dev, buffer, sizeof(struct uinput_user_dev))) {
		retval = -EFAULT;
		goto exit;
	}

	udev->ff_effects_max = user_dev->ff_effects_max;

	size = strnlen(user_dev->name, UINPUT_MAX_NAME_SIZE) + 1;
	if (!size) {
		retval = -EINVAL;
		goto exit;
	}

	kfree(dev->name);
	dev->name = name = kmalloc(size, GFP_KERNEL);
	if (!name) {
		retval = -ENOMEM;
		goto exit;
	}
	strlcpy(name, user_dev->name, size);

	dev->id.bustype	= user_dev->id.bustype;
	dev->id.vendor	= user_dev->id.vendor;
	dev->id.product	= user_dev->id.product;
	dev->id.version	= user_dev->id.version;

	size = sizeof(int) * (ABS_MAX + 1);
	memcpy(dev->absmax, user_dev->absmax, size);
	memcpy(dev->absmin, user_dev->absmin, size);
	memcpy(dev->absfuzz, user_dev->absfuzz, size);
	memcpy(dev->absflat, user_dev->absflat, size);

	/* check if absmin/absmax/absfuzz/absflat are filled as
	 * told in Documentation/input/input-programming.txt */
	if (test_bit(EV_ABS, dev->evbit)) {
		retval = uinput_validate_absbits(dev);
		if (retval < 0)
			goto exit;
	}

	udev->state = UIST_SETUP_COMPLETE;
	retval = count;

 exit:
	kfree(user_dev);
	return retval;
}

static inline ssize_t uinput_inject_event(struct uinput_device *udev, const char __user *buffer, size_t count)
{
	struct input_event ev;

	if (count != sizeof(struct input_event))
		return -EINVAL;

	if (copy_from_user(&ev, buffer, sizeof(struct input_event)))
		return -EFAULT;

	input_event(udev->dev, ev.type, ev.code, ev.value);

	return sizeof(struct input_event);
}

static ssize_t uinput_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
{
	struct uinput_device *udev = file->private_data;
	int retval;

	retval = mutex_lock_interruptible(&udev->mutex);
	if (retval)
		return retval;

	retval = udev->state == UIST_CREATED ?
			uinput_inject_event(udev, buffer, count) :
			uinput_setup_device(udev, buffer, count);

	mutex_unlock(&udev->mutex);

	return retval;
}

static ssize_t uinput_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
{
	struct uinput_device *udev = file->private_data;
	int retval = 0;

	if (udev->state != UIST_CREATED)
		return -ENODEV;

	if (udev->head == udev->tail && (file->f_flags & O_NONBLOCK))
		return -EAGAIN;

	retval = wait_event_interruptible(udev->waitq,
			udev->head != udev->tail || udev->state != UIST_CREATED);
	if (retval)
		return retval;

	retval = mutex_lock_interruptible(&udev->mutex);
	if (retval)
		return retval;

	if (udev->state != UIST_CREATED) {
		retval = -ENODEV;
		goto out;
	}

	while (udev->head != udev->tail && retval + sizeof(struct input_event) <= count) {
		if (copy_to_user(buffer + retval, &udev->buff[udev->tail], sizeof(struct input_event))) {
			retval = -EFAULT;
			goto out;
		}
		udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
		retval += sizeof(struct input_event);
	}

 out:
	mutex_unlock(&udev->mutex);

	return retval;
}

static unsigned int uinput_poll(struct file *file, poll_table *wait)
{
	struct uinput_device *udev = file->private_data;

	poll_wait(file, &udev->waitq, wait);

	if (udev->head != udev->tail)
		return POLLIN | POLLRDNORM;

	return 0;
}

static int uinput_release(struct inode *inode, struct file *file)
{
	struct uinput_device *udev = file->private_data;

	uinput_destroy_device(udev);
	kfree(udev);

	return 0;
}

#define uinput_set_bit(_arg, _bit, _max)		\
({							\
	int __ret = 0;					\
	if (udev->state == UIST_CREATED)		\
		__ret =  -EINVAL;			\
	else if ((_arg) > (_max))			\
		__ret = -EINVAL;			\
	else set_bit((_arg), udev->dev->_bit);		\
	__ret;						\
})

static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	int			retval;
	struct uinput_device	*udev;
	void __user             *p = (void __user *)arg;
	struct uinput_ff_upload ff_up;
	struct uinput_ff_erase  ff_erase;
	struct uinput_request   *req;
	int                     length;
	char			*phys;

	udev = file->private_data;

	retval = mutex_lock_interruptible(&udev->mutex);
	if (retval)
		return retval;

	if (!udev->dev) {
		retval = uinput_allocate_device(udev);
		if (retval)
			goto out;
	}

	switch (cmd) {
		case UI_DEV_CREATE:
			retval = uinput_create_device(udev);
			break;

		case UI_DEV_DESTROY:
			uinput_destroy_device(udev);
			break;

		case UI_SET_EVBIT:
			retval = uinput_set_bit(arg, evbit, EV_MAX);
			break;

		case UI_SET_KEYBIT:
			retval = uinput_set_bit(arg, keybit, KEY_MAX);
			break;

		case UI_SET_RELBIT:
			retval = uinput_set_bit(arg, relbit, REL_MAX);
			break;

		case UI_SET_ABSBIT:
			retval = uinput_set_bit(arg, absbit, ABS_MAX);
			break;

		case UI_SET_MSCBIT:
			retval = uinput_set_bit(arg, mscbit, MSC_MAX);
			break;

		case UI_SET_LEDBIT:
			retval = uinput_set_bit(arg, ledbit, LED_MAX);
			break;

		case UI_SET_SNDBIT:
			retval = uinput_set_bit(arg, sndbit, SND_MAX);
			break;

		case UI_SET_FFBIT:
			retval = uinput_set_bit(arg, ffbit, FF_MAX);
			break;

		case UI_SET_SWBIT:
			retval = uinput_set_bit(arg, swbit, SW_MAX);
			break;

		case UI_SET_PHYS:
			if (udev->state == UIST_CREATED) {
				retval = -EINVAL;
				goto out;
			}
			length = strnlen_user(p, 1024);
			if (length <= 0) {
				retval = -EFAULT;
				break;
			}
			kfree(udev->dev->phys);
			udev->dev->phys = phys = kmalloc(length, GFP_KERNEL);
			if (!phys) {
				retval = -ENOMEM;
				break;
			}
			if (copy_from_user(phys, p, length)) {
				udev->dev->phys = NULL;
				kfree(phys);
				retval = -EFAULT;
				break;
			}
			phys[length - 1] = '\0';
			break;

		case UI_BEGIN_FF_UPLOAD:
			if (copy_from_user(&ff_up, p, sizeof(ff_up))) {
				retval = -EFAULT;
				break;
			}
			req = uinput_request_find(udev, ff_up.request_id);
			if (!(req && req->code == UI_FF_UPLOAD && req->u.upload.effect)) {
				retval = -EINVAL;
				break;
			}
			ff_up.retval = 0;
			memcpy(&ff_up.effect, req->u.upload.effect, sizeof(struct ff_effect));
			if (req->u.upload.old)
				memcpy(&ff_up.old, req->u.upload.old, sizeof(struct ff_effect));
			else
				memset(&ff_up.old, 0, sizeof(struct ff_effect));

			if (copy_to_user(p, &ff_up, sizeof(ff_up))) {
				retval = -EFAULT;
				break;
			}
			break;

		case UI_BEGIN_FF_ERASE:
			if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
				retval = -EFAULT;
				break;
			}
			req = uinput_request_find(udev, ff_erase.request_id);
			if (!(req && req->code == UI_FF_ERASE)) {
				retval = -EINVAL;
				break;
			}
			ff_erase.retval = 0;
			ff_erase.effect_id = req->u.effect_id;
			if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
				retval = -EFAULT;
				break;
			}
			break;

		case UI_END_FF_UPLOAD:
			if (copy_from_user(&ff_up, p, sizeof(ff_up))) {
				retval = -EFAULT;
				break;
			}
			req = uinput_request_find(udev, ff_up.request_id);
			if (!(req && req->code == UI_FF_UPLOAD && req->u.upload.effect)) {
				retval = -EINVAL;
				break;
			}
			req->retval = ff_up.retval;
			uinput_request_done(udev, req);
			break;

		case UI_END_FF_ERASE:
			if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
				retval = -EFAULT;
				break;
			}
			req = uinput_request_find(udev, ff_erase.request_id);
			if (!(req && req->code == UI_FF_ERASE)) {
				retval = -EINVAL;
				break;
			}
			req->retval = ff_erase.retval;
			uinput_request_done(udev, req);
			break;

		default:
			retval = -EINVAL;
	}

 out:
	mutex_unlock(&udev->mutex);
	return retval;
}

static const struct file_operations uinput_fops = {
	.owner		= THIS_MODULE,
	.open		= uinput_open,
	.release	= uinput_release,
	.read		= uinput_read,
	.write		= uinput_write,
	.poll		= uinput_poll,
	.unlocked_ioctl	= uinput_ioctl,
};

static struct miscdevice uinput_misc = {
	.fops		= &uinput_fops,
	.minor		= UINPUT_MINOR,
	.name		= UINPUT_NAME,
};

static int __init uinput_init(void)
{
	return misc_register(&uinput_misc);
}

static void __exit uinput_exit(void)
{
	misc_deregister(&uinput_misc);
}

MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
MODULE_DESCRIPTION("User level driver support for input subsystem");
MODULE_LICENSE("GPL");
MODULE_VERSION("0.3");

module_init(uinput_init);
module_exit(uinput_exit);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* User level driver support for input subsystem
	3	*
	4	* Heavily based on evdev.c by Vojtech Pavlik
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*
	20	* Author: Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org>
	21	*
	22	* Changes/Revisions:
ff462551 AH	23	* 0.3 09/04/2006 (Anssi Hannula <anssi.hannula@gmail.com>)
	24	* - updated ff support for the changes in kernel interface
	25	* - added MODULE_VERSION
1da177e4 LT	26	* 0.2 16/10/2004 (Micah Dowty <micah@navi.cx>)
	27	* - added force feedback support
	28	* - added UI_SET_PHYS
	29	* 0.1 20/06/2002
	30	* - first public version
	31	*/
	32	#include <linux/poll.h>
	33	#include <linux/slab.h>
	34	#include <linux/module.h>
	35	#include <linux/init.h>
	36	#include <linux/input.h>
	37	#include <linux/smp_lock.h>
	38	#include <linux/fs.h>
	39	#include <linux/miscdevice.h>
	40	#include <linux/uinput.h>
	41
1da177e4 LT	42	static int uinput_dev_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
	43	{
	44	struct uinput_device *udev;
	45
	46	udev = dev->private;
	47
	48	udev->buff[udev->head].type = type;
	49	udev->buff[udev->head].code = code;
	50	udev->buff[udev->head].value = value;
	51	do_gettimeofday(&udev->buff[udev->head].time);
	52	udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE;
	53
	54	wake_up_interruptible(&udev->waitq);
	55
	56	return 0;
	57	}
	58
0048e603	59	static int uinput_request_alloc_id(struct uinput_device udev, struct uinput_request request)
1da177e4 LT	60	{
1da177e4 LT	61	/* Atomically allocate an ID for the given request. Returns 0 on success. */
1da177e4	62	int id;
152c12f5	63	int err = -1;
1da177e4	64
0048e603	65	spin_lock(&udev->requests_lock);
152c12f5 DT	66
152c12f5 DT	67	for (id = 0; id < UINPUT_NUM_REQUESTS; id++)
1da177e4	68	if (!udev->requests[id]) {
1da177e4	69	request->id = id;
0048e603	70	udev->requests[id] = request;
152c12f5 DT	71	err = 0;
152c12f5 DT	72	break;
1da177e4	73	}
152c12f5	74
0048e603	75	spin_unlock(&udev->requests_lock);
152c12f5	76	return err;
1da177e4 LT	77	}
	78
	79	static struct uinput_request* uinput_request_find(struct uinput_device *udev, int id)
	80	{
	81	/* Find an input request, by ID. Returns NULL if the ID isn't valid. */
	82	if (id >= UINPUT_NUM_REQUESTS \|\| id < 0)
	83	return NULL;
1da177e4 LT	84	return udev->requests[id];
	85	}
	86
0048e603	87	static inline int uinput_request_reserve_slot(struct uinput_device udev, struct uinput_request request)
1da177e4	88	{
0048e603 DT	89	/* Allocate slot. If none are available right away, wait. */
	90	return wait_event_interruptible(udev->requests_waitq,
	91	!uinput_request_alloc_id(udev, request));
	92	}
1da177e4	93
0048e603 DT	94	static void uinput_request_done(struct uinput_device udev, struct uinput_request request)
0048e603 DT	95	{
0048e603 DT	96	/* Mark slot as available */
0048e603 DT	97	udev->requests[request->id] = NULL;
e597f0c8	98	wake_up(&udev->requests_waitq);
e7507ed9 DT	99
e7507ed9 DT	100	complete(&request->done);
1da177e4 LT	101	}
1da177e4 LT	102
0048e603	103	static int uinput_request_submit(struct input_dev dev, struct uinput_request request)
1da177e4	104	{
1da177e4 LT	105	/* Tell our userspace app about this new request by queueing an input event */
	106	uinput_dev_event(dev, EV_UINPUT, request->code, request->id);
	107
	108	/* Wait for the request to complete */
e597f0c8 DT	109	wait_for_completion(&request->done);
e597f0c8 DT	110	return request->retval;
1da177e4 LT	111	}
1da177e4 LT	112
ff462551 AH	113	static void uinput_dev_set_gain(struct input_dev *dev, u16 gain)
	114	{
	115	uinput_dev_event(dev, EV_FF, FF_GAIN, gain);
	116	}
	117
	118	static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude)
	119	{
	120	uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude);
	121	}
	122
	123	static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value)
	124	{
	125	return uinput_dev_event(dev, EV_FF, effect_id, value);
	126	}
	127
	128	static int uinput_dev_upload_effect(struct input_dev dev, struct ff_effect effect, struct ff_effect *old)
1da177e4 LT	129	{
1da177e4 LT	130	struct uinput_request request;
0048e603	131	int retval;
1da177e4	132
0048e603 DT	133	request.id = -1;
	134	init_completion(&request.done);
	135	request.code = UI_FF_UPLOAD;
ff462551 AH	136	request.u.upload.effect = effect;
ff462551 AH	137	request.u.upload.old = old;
0048e603 DT	138
	139	retval = uinput_request_reserve_slot(dev->private, &request);
	140	if (!retval)
	141	retval = uinput_request_submit(dev, &request);
	142
	143	return retval;
1da177e4 LT	144	}
	145
	146	static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id)
	147	{
	148	struct uinput_request request;
0048e603	149	int retval;
1da177e4 LT	150
	151	if (!test_bit(EV_FF, dev->evbit))
	152	return -ENOSYS;
	153
0048e603 DT	154	request.id = -1;
	155	init_completion(&request.done);
	156	request.code = UI_FF_ERASE;
1da177e4	157	request.u.effect_id = effect_id;
0048e603 DT	158
	159	retval = uinput_request_reserve_slot(dev->private, &request);
	160	if (!retval)
	161	retval = uinput_request_submit(dev, &request);
	162
	163	return retval;
1da177e4 LT	164	}
1da177e4 LT	165
29506415	166	static void uinput_destroy_device(struct uinput_device *udev)
1da177e4	167	{
29506415 DT	168	const char name, phys;
	169
	170	if (udev->dev) {
	171	name = udev->dev->name;
	172	phys = udev->dev->phys;
	173	if (udev->state == UIST_CREATED)
	174	input_unregister_device(udev->dev);
	175	else
	176	input_free_device(udev->dev);
	177	kfree(name);
	178	kfree(phys);
	179	udev->dev = NULL;
1da177e4 LT	180	}
1da177e4 LT	181
29506415	182	udev->state = UIST_NEW_DEVICE;
1da177e4 LT	183	}
1da177e4 LT	184
29506415	185	static int uinput_create_device(struct uinput_device *udev)
1da177e4	186	{
ff462551	187	struct input_dev *dev = udev->dev;
29506415 DT	188	int error;
	189
	190	if (udev->state != UIST_SETUP_COMPLETE) {
	191	printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
1da177e4 LT	192	return -EINVAL;
	193	}
	194
ff462551 AH	195	if (udev->ff_effects_max) {
	196	error = input_ff_create(dev, udev->ff_effects_max);
	197	if (error)
	198	goto fail1;
	199
	200	dev->ff->upload = uinput_dev_upload_effect;
	201	dev->ff->erase = uinput_dev_erase_effect;
	202	dev->ff->playback = uinput_dev_playback;
	203	dev->ff->set_gain = uinput_dev_set_gain;
	204	dev->ff->set_autocenter = uinput_dev_set_autocenter;
29506415	205	}
1da177e4	206
ff462551 AH	207	error = input_register_device(udev->dev);
	208	if (error)
	209	goto fail2;
	210
29506415	211	udev->state = UIST_CREATED;
1da177e4 LT	212
1da177e4 LT	213	return 0;
ff462551 AH	214
	215	fail2: input_ff_destroy(dev);
	216	fail1: uinput_destroy_device(udev);
	217	return error;
1da177e4 LT	218	}
	219
	220	static int uinput_open(struct inode inode, struct file file)
	221	{
29506415	222	struct uinput_device *newdev;
1da177e4	223
29506415	224	newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL);
1da177e4	225	if (!newdev)
29506415 DT	226	return -ENOMEM;
29506415 DT	227
221979aa	228	mutex_init(&newdev->mutex);
0048e603	229	spin_lock_init(&newdev->requests_lock);
1da177e4	230	init_waitqueue_head(&newdev->requests_waitq);
29506415 DT	231	init_waitqueue_head(&newdev->waitq);
29506415 DT	232	newdev->state = UIST_NEW_DEVICE;
1da177e4 LT	233
	234	file->private_data = newdev;
	235
	236	return 0;
1da177e4 LT	237	}
	238
	239	static int uinput_validate_absbits(struct input_dev *dev)
	240	{
	241	unsigned int cnt;
	242	int retval = 0;
	243
	244	for (cnt = 0; cnt < ABS_MAX + 1; cnt++) {
	245	if (!test_bit(cnt, dev->absbit))
	246	continue;
	247
	248	if ((dev->absmax[cnt] <= dev->absmin[cnt])) {
	249	printk(KERN_DEBUG
	250	"%s: invalid abs[%02x] min:%d max:%d\n",
	251	UINPUT_NAME, cnt,
	252	dev->absmin[cnt], dev->absmax[cnt]);
	253	retval = -EINVAL;
	254	break;
	255	}
	256
	257	if (dev->absflat[cnt] > (dev->absmax[cnt] - dev->absmin[cnt])) {
	258	printk(KERN_DEBUG
	259	"%s: absflat[%02x] out of range: %d "
	260	"(min:%d/max:%d)\n",
	261	UINPUT_NAME, cnt, dev->absflat[cnt],
	262	dev->absmin[cnt], dev->absmax[cnt]);
	263	retval = -EINVAL;
	264	break;
	265	}
	266	}
	267	return retval;
	268	}
	269
29506415 DT	270	static int uinput_allocate_device(struct uinput_device *udev)
	271	{
	272	udev->dev = input_allocate_device();
	273	if (!udev->dev)
	274	return -ENOMEM;
	275
	276	udev->dev->event = uinput_dev_event;
29506415 DT	277	udev->dev->private = udev;
	278
	279	return 0;
	280	}
	281
	282	static int uinput_setup_device(struct uinput_device udev, const char __user buffer, size_t count)
1da177e4 LT	283	{
	284	struct uinput_user_dev *user_dev;
	285	struct input_dev *dev;
5b6271bd	286	char *name;
152c12f5 DT	287	int size;
152c12f5 DT	288	int retval;
1da177e4	289
29506415 DT	290	if (count != sizeof(struct uinput_user_dev))
	291	return -EINVAL;
	292
	293	if (!udev->dev) {
	294	retval = uinput_allocate_device(udev);
	295	if (retval)
	296	return retval;
	297	}
1da177e4	298
1da177e4 LT	299	dev = udev->dev;
1da177e4 LT	300
152c12f5	301	user_dev = kmalloc(sizeof(struct uinput_user_dev), GFP_KERNEL);
29506415 DT	302	if (!user_dev)
29506415 DT	303	return -ENOMEM;
1da177e4 LT	304
	305	if (copy_from_user(user_dev, buffer, sizeof(struct uinput_user_dev))) {
	306	retval = -EFAULT;
	307	goto exit;
	308	}
	309
ff462551 AH	310	udev->ff_effects_max = user_dev->ff_effects_max;
ff462551 AH	311
1da177e4	312	size = strnlen(user_dev->name, UINPUT_MAX_NAME_SIZE) + 1;
29506415 DT	313	if (!size) {
	314	retval = -EINVAL;
	315	goto exit;
	316	}
	317
	318	kfree(dev->name);
5b6271bd DT	319	dev->name = name = kmalloc(size, GFP_KERNEL);
5b6271bd DT	320	if (!name) {
1da177e4 LT	321	retval = -ENOMEM;
	322	goto exit;
	323	}
5b6271bd	324	strlcpy(name, user_dev->name, size);
1da177e4	325
1da177e4 LT	326	dev->id.bustype = user_dev->id.bustype;
	327	dev->id.vendor = user_dev->id.vendor;
	328	dev->id.product = user_dev->id.product;
	329	dev->id.version = user_dev->id.version;
1da177e4 LT	330
	331	size = sizeof(int) * (ABS_MAX + 1);
	332	memcpy(dev->absmax, user_dev->absmax, size);
	333	memcpy(dev->absmin, user_dev->absmin, size);
	334	memcpy(dev->absfuzz, user_dev->absfuzz, size);
	335	memcpy(dev->absflat, user_dev->absflat, size);
	336
	337	/* check if absmin/absmax/absfuzz/absflat are filled as
	338	* told in Documentation/input/input-programming.txt */
	339	if (test_bit(EV_ABS, dev->evbit)) {
29506415 DT	340	retval = uinput_validate_absbits(dev);
	341	if (retval < 0)
	342	goto exit;
1da177e4 LT	343	}
1da177e4 LT	344
29506415 DT	345	udev->state = UIST_SETUP_COMPLETE;
	346	retval = count;
	347
	348	exit:
1da177e4 LT	349	kfree(user_dev);
	350	return retval;
	351	}
	352
29506415 DT	353	static inline ssize_t uinput_inject_event(struct uinput_device udev, const char __user buffer, size_t count)
	354	{
	355	struct input_event ev;
	356
	357	if (count != sizeof(struct input_event))
	358	return -EINVAL;
	359
	360	if (copy_from_user(&ev, buffer, sizeof(struct input_event)))
	361	return -EFAULT;
	362
	363	input_event(udev->dev, ev.type, ev.code, ev.value);
	364
	365	return sizeof(struct input_event);
	366	}
	367
1da177e4 LT	368	static ssize_t uinput_write(struct file file, const char __user buffer, size_t count, loff_t *ppos)
	369	{
	370	struct uinput_device *udev = file->private_data;
29506415	371	int retval;
1da177e4	372
221979aa	373	retval = mutex_lock_interruptible(&udev->mutex);
29506415 DT	374	if (retval)
	375	return retval;
	376
	377	retval = udev->state == UIST_CREATED ?
	378	uinput_inject_event(udev, buffer, count) :
	379	uinput_setup_device(udev, buffer, count);
1da177e4	380
221979aa	381	mutex_unlock(&udev->mutex);
1da177e4	382
29506415	383	return retval;
1da177e4 LT	384	}
	385
	386	static ssize_t uinput_read(struct file file, char __user buffer, size_t count, loff_t *ppos)
	387	{
	388	struct uinput_device *udev = file->private_data;
	389	int retval = 0;
	390
29506415	391	if (udev->state != UIST_CREATED)
1da177e4 LT	392	return -ENODEV;
1da177e4 LT	393
152c12f5	394	if (udev->head == udev->tail && (file->f_flags & O_NONBLOCK))
1da177e4 LT	395	return -EAGAIN;
	396
	397	retval = wait_event_interruptible(udev->waitq,
29506415	398	udev->head != udev->tail \|\| udev->state != UIST_CREATED);
1da177e4 LT	399	if (retval)
	400	return retval;
	401
221979aa	402	retval = mutex_lock_interruptible(&udev->mutex);
29506415 DT	403	if (retval)
	404	return retval;
	405
	406	if (udev->state != UIST_CREATED) {
	407	retval = -ENODEV;
	408	goto out;
	409	}
1da177e4	410
29506415 DT	411	while (udev->head != udev->tail && retval + sizeof(struct input_event) <= count) {
	412	if (copy_to_user(buffer + retval, &udev->buff[udev->tail], sizeof(struct input_event))) {
	413	retval = -EFAULT;
	414	goto out;
	415	}
1da177e4 LT	416	udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
	417	retval += sizeof(struct input_event);
	418	}
	419
29506415	420	out:
221979aa	421	mutex_unlock(&udev->mutex);
29506415	422
1da177e4 LT	423	return retval;
	424	}
	425
	426	static unsigned int uinput_poll(struct file file, poll_table wait)
	427	{
	428	struct uinput_device *udev = file->private_data;
	429
	430	poll_wait(file, &udev->waitq, wait);
	431
	432	if (udev->head != udev->tail)
	433	return POLLIN \| POLLRDNORM;
	434
	435	return 0;
	436	}
	437
29506415	438	static int uinput_release(struct inode inode, struct file file)
1da177e4	439	{
29506415	440	struct uinput_device *udev = file->private_data;
1da177e4	441
29506415	442	uinput_destroy_device(udev);
1da177e4 LT	443	kfree(udev);
	444
	445	return 0;
	446	}
	447
29506415 DT	448	#define uinput_set_bit(_arg, _bit, _max) \
	449	({ \
	450	int __ret = 0; \
	451	if (udev->state == UIST_CREATED) \
	452	__ret = -EINVAL; \
	453	else if ((_arg) > (_max)) \
	454	__ret = -EINVAL; \
	455	else set_bit((_arg), udev->dev->_bit); \
	456	__ret; \
	457	})
	458
	459	static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1da177e4	460	{
29506415	461	int retval;
1da177e4 LT	462	struct uinput_device *udev;
	463	void __user p = (void __user )arg;
	464	struct uinput_ff_upload ff_up;
	465	struct uinput_ff_erase ff_erase;
	466	struct uinput_request *req;
	467	int length;
5b6271bd	468	char *phys;
1da177e4 LT	469
	470	udev = file->private_data;
	471
221979aa	472	retval = mutex_lock_interruptible(&udev->mutex);
29506415 DT	473	if (retval)
	474	return retval;
	475
	476	if (!udev->dev) {
	477	retval = uinput_allocate_device(udev);
	478	if (retval)
	479	goto out;
1da177e4 LT	480	}
	481
	482	switch (cmd) {
	483	case UI_DEV_CREATE:
	484	retval = uinput_create_device(udev);
	485	break;
	486
	487	case UI_DEV_DESTROY:
29506415	488	uinput_destroy_device(udev);
1da177e4 LT	489	break;
	490
	491	case UI_SET_EVBIT:
29506415	492	retval = uinput_set_bit(arg, evbit, EV_MAX);
1da177e4 LT	493	break;
	494
	495	case UI_SET_KEYBIT:
29506415	496	retval = uinput_set_bit(arg, keybit, KEY_MAX);
1da177e4 LT	497	break;
	498
	499	case UI_SET_RELBIT:
29506415	500	retval = uinput_set_bit(arg, relbit, REL_MAX);
1da177e4 LT	501	break;
	502
	503	case UI_SET_ABSBIT:
29506415	504	retval = uinput_set_bit(arg, absbit, ABS_MAX);
1da177e4 LT	505	break;
	506
	507	case UI_SET_MSCBIT:
29506415	508	retval = uinput_set_bit(arg, mscbit, MSC_MAX);
1da177e4 LT	509	break;
	510
	511	case UI_SET_LEDBIT:
29506415	512	retval = uinput_set_bit(arg, ledbit, LED_MAX);
1da177e4 LT	513	break;
	514
	515	case UI_SET_SNDBIT:
29506415	516	retval = uinput_set_bit(arg, sndbit, SND_MAX);
1da177e4 LT	517	break;
	518
	519	case UI_SET_FFBIT:
29506415	520	retval = uinput_set_bit(arg, ffbit, FF_MAX);
1da177e4 LT	521	break;
1da177e4 LT	522
59c7c037 DT	523	case UI_SET_SWBIT:
	524	retval = uinput_set_bit(arg, swbit, SW_MAX);
	525	break;
	526
1da177e4	527	case UI_SET_PHYS:
29506415 DT	528	if (udev->state == UIST_CREATED) {
	529	retval = -EINVAL;
	530	goto out;
	531	}
1da177e4 LT	532	length = strnlen_user(p, 1024);
	533	if (length <= 0) {
	534	retval = -EFAULT;
	535	break;
	536	}
5b6271bd DT	537	kfree(udev->dev->phys);
	538	udev->dev->phys = phys = kmalloc(length, GFP_KERNEL);
	539	if (!phys) {
1da177e4 LT	540	retval = -ENOMEM;
	541	break;
	542	}
5b6271bd	543	if (copy_from_user(phys, p, length)) {
1da177e4	544	udev->dev->phys = NULL;
5b6271bd DT	545	kfree(phys);
5b6271bd DT	546	retval = -EFAULT;
1da177e4 LT	547	break;
1da177e4 LT	548	}
5b6271bd	549	phys[length - 1] = '\0';
1da177e4 LT	550	break;
	551
	552	case UI_BEGIN_FF_UPLOAD:
	553	if (copy_from_user(&ff_up, p, sizeof(ff_up))) {
	554	retval = -EFAULT;
	555	break;
	556	}
	557	req = uinput_request_find(udev, ff_up.request_id);
ff462551	558	if (!(req && req->code == UI_FF_UPLOAD && req->u.upload.effect)) {
1da177e4 LT	559	retval = -EINVAL;
	560	break;
	561	}
	562	ff_up.retval = 0;
ff462551 AH	563	memcpy(&ff_up.effect, req->u.upload.effect, sizeof(struct ff_effect));
	564	if (req->u.upload.old)
	565	memcpy(&ff_up.old, req->u.upload.old, sizeof(struct ff_effect));
	566	else
	567	memset(&ff_up.old, 0, sizeof(struct ff_effect));
	568
1da177e4 LT	569	if (copy_to_user(p, &ff_up, sizeof(ff_up))) {
	570	retval = -EFAULT;
	571	break;
	572	}
	573	break;
	574
	575	case UI_BEGIN_FF_ERASE:
	576	if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
	577	retval = -EFAULT;
	578	break;
	579	}
	580	req = uinput_request_find(udev, ff_erase.request_id);
152c12f5	581	if (!(req && req->code == UI_FF_ERASE)) {
1da177e4 LT	582	retval = -EINVAL;
	583	break;
	584	}
	585	ff_erase.retval = 0;
	586	ff_erase.effect_id = req->u.effect_id;
	587	if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
	588	retval = -EFAULT;
	589	break;
	590	}
	591	break;
	592
	593	case UI_END_FF_UPLOAD:
	594	if (copy_from_user(&ff_up, p, sizeof(ff_up))) {
	595	retval = -EFAULT;
	596	break;
	597	}
	598	req = uinput_request_find(udev, ff_up.request_id);
ff462551	599	if (!(req && req->code == UI_FF_UPLOAD && req->u.upload.effect)) {
1da177e4 LT	600	retval = -EINVAL;
	601	break;
	602	}
	603	req->retval = ff_up.retval;
0048e603	604	uinput_request_done(udev, req);
1da177e4 LT	605	break;
	606
	607	case UI_END_FF_ERASE:
	608	if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
	609	retval = -EFAULT;
	610	break;
	611	}
	612	req = uinput_request_find(udev, ff_erase.request_id);
152c12f5	613	if (!(req && req->code == UI_FF_ERASE)) {
1da177e4 LT	614	retval = -EINVAL;
	615	break;
	616	}
	617	req->retval = ff_erase.retval;
0048e603	618	uinput_request_done(udev, req);
1da177e4 LT	619	break;
	620
	621	default:
	622	retval = -EINVAL;
	623	}
29506415 DT	624
29506415 DT	625	out:
221979aa	626	mutex_unlock(&udev->mutex);
1da177e4 LT	627	return retval;
	628	}
	629
2b8693c0	630	static const struct file_operations uinput_fops = {
29506415 DT	631	.owner = THIS_MODULE,
	632	.open = uinput_open,
	633	.release = uinput_release,
	634	.read = uinput_read,
	635	.write = uinput_write,
	636	.poll = uinput_poll,
	637	.unlocked_ioctl = uinput_ioctl,
1da177e4 LT	638	};
	639
	640	static struct miscdevice uinput_misc = {
29506415 DT	641	.fops = &uinput_fops,
	642	.minor = UINPUT_MINOR,
	643	.name = UINPUT_NAME,
1da177e4 LT	644	};
	645
	646	static int __init uinput_init(void)
	647	{
	648	return misc_register(&uinput_misc);
	649	}
	650
	651	static void __exit uinput_exit(void)
	652	{
	653	misc_deregister(&uinput_misc);
	654	}
	655
	656	MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
	657	MODULE_DESCRIPTION("User level driver support for input subsystem");
	658	MODULE_LICENSE("GPL");
ff462551	659	MODULE_VERSION("0.3");
1da177e4 LT	660
	661	module_init(uinput_init);
	662	module_exit(uinput_exit);
	663