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:
 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
 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/sched.h>
 34#include <linux/slab.h>
 35#include <linux/module.h>
 36#include <linux/init.h>
 37#include <linux/fs.h>
 38#include <linux/miscdevice.h>
 39#include <linux/uinput.h>
 40#include <linux/input/mt.h>
 41#include "../input-compat.h"
 42
 43static int uinput_dev_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
 44{
 45	struct uinput_device	*udev = input_get_drvdata(dev);
 46
 47	udev->buff[udev->head].type = type;
 48	udev->buff[udev->head].code = code;
 49	udev->buff[udev->head].value = value;
 50	do_gettimeofday(&udev->buff[udev->head].time);
 51	udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE;
 52
 53	wake_up_interruptible(&udev->waitq);
 54
 55	return 0;
 56}
 57
 58/* Atomically allocate an ID for the given request. Returns 0 on success. */
 59static int uinput_request_alloc_id(struct uinput_device *udev, struct uinput_request *request)
 60{
 61	int id;
 62	int err = -1;
 63
 64	spin_lock(&udev->requests_lock);
 65
 66	for (id = 0; id < UINPUT_NUM_REQUESTS; id++) {
 67		if (!udev->requests[id]) {
 68			request->id = id;
 69			udev->requests[id] = request;
 70			err = 0;
 71			break;
 72		}
 73	}
 74
 75	spin_unlock(&udev->requests_lock);
 76	return err;
 77}
 78
 79static 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;
 84
 85	return udev->requests[id];
 86}
 87
 88static inline int uinput_request_reserve_slot(struct uinput_device *udev, struct uinput_request *request)
 89{
 90	/* Allocate slot. If none are available right away, wait. */
 91	return wait_event_interruptible(udev->requests_waitq,
 92					!uinput_request_alloc_id(udev, request));
 93}
 94
 95static void uinput_request_done(struct uinput_device *udev, struct uinput_request *request)
 96{
 97	/* Mark slot as available */
 98	udev->requests[request->id] = NULL;
 99	wake_up(&udev->requests_waitq);
100
101	complete(&request->done);
102}
103
104static int uinput_request_submit(struct uinput_device *udev, struct uinput_request *request)
105{
106	int retval;
107
108	retval = uinput_request_reserve_slot(udev, request);
109	if (retval)
110		return retval;
111
112	retval = mutex_lock_interruptible(&udev->mutex);
113	if (retval)
114		return retval;
115
116	if (udev->state != UIST_CREATED) {
117		retval = -ENODEV;
118		goto out;
119	}
120
121	/* Tell our userspace app about this new request by queueing an input event */
122	uinput_dev_event(udev->dev, EV_UINPUT, request->code, request->id);
123
124 out:
125	mutex_unlock(&udev->mutex);
126	return retval;
127}
128
129/*
130 * Fail all ouitstanding requests so handlers don't wait for the userspace
131 * to finish processing them.
132 */
133static void uinput_flush_requests(struct uinput_device *udev)
134{
135	struct uinput_request *request;
136	int i;
137
138	spin_lock(&udev->requests_lock);
139
140	for (i = 0; i < UINPUT_NUM_REQUESTS; i++) {
141		request = udev->requests[i];
142		if (request) {
143			request->retval = -ENODEV;
144			uinput_request_done(udev, request);
145		}
146	}
147
148	spin_unlock(&udev->requests_lock);
149}
150
151static void uinput_dev_set_gain(struct input_dev *dev, u16 gain)
152{
153	uinput_dev_event(dev, EV_FF, FF_GAIN, gain);
154}
155
156static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude)
157{
158	uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude);
159}
160
161static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value)
162{
163	return uinput_dev_event(dev, EV_FF, effect_id, value);
164}
165
166static int uinput_dev_upload_effect(struct input_dev *dev, struct ff_effect *effect, struct ff_effect *old)
167{
168	struct uinput_device *udev = input_get_drvdata(dev);
169	struct uinput_request request;
170	int retval;
171
172	/*
173	 * uinput driver does not currently support periodic effects with
174	 * custom waveform since it does not have a way to pass buffer of
175	 * samples (custom_data) to userspace. If ever there is a device
176	 * supporting custom waveforms we would need to define an additional
177	 * ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out.
178	 */
179	if (effect->type == FF_PERIODIC &&
180			effect->u.periodic.waveform == FF_CUSTOM)
181		return -EINVAL;
182
183	request.id = -1;
184	init_completion(&request.done);
185	request.code = UI_FF_UPLOAD;
186	request.u.upload.effect = effect;
187	request.u.upload.old = old;
188
189	retval = uinput_request_submit(udev, &request);
190	if (!retval) {
191		wait_for_completion(&request.done);
192		retval = request.retval;
193	}
194
195	return retval;
196}
197
198static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id)
199{
200	struct uinput_device *udev = input_get_drvdata(dev);
201	struct uinput_request request;
202	int retval;
203
204	if (!test_bit(EV_FF, dev->evbit))
205		return -ENOSYS;
206
207	request.id = -1;
208	init_completion(&request.done);
209	request.code = UI_FF_ERASE;
210	request.u.effect_id = effect_id;
211
212	retval = uinput_request_submit(udev, &request);
213	if (!retval) {
214		wait_for_completion(&request.done);
215		retval = request.retval;
216	}
217
218	return retval;
219}
220
221static void uinput_destroy_device(struct uinput_device *udev)
222{
223	const char *name, *phys;
224	struct input_dev *dev = udev->dev;
225	enum uinput_state old_state = udev->state;
226
227	udev->state = UIST_NEW_DEVICE;
228
229	if (dev) {
230		name = dev->name;
231		phys = dev->phys;
232		if (old_state == UIST_CREATED) {
233			uinput_flush_requests(udev);
234			input_unregister_device(dev);
235		} else {
236			input_free_device(dev);
237		}
238		kfree(name);
239		kfree(phys);
240		udev->dev = NULL;
241	}
242}
243
244static int uinput_create_device(struct uinput_device *udev)
245{
246	struct input_dev *dev = udev->dev;
247	int error;
248
249	if (udev->state != UIST_SETUP_COMPLETE) {
250		printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
251		return -EINVAL;
252	}
253
254	if (udev->ff_effects_max) {
255		error = input_ff_create(dev, udev->ff_effects_max);
256		if (error)
257			goto fail1;
258
259		dev->ff->upload = uinput_dev_upload_effect;
260		dev->ff->erase = uinput_dev_erase_effect;
261		dev->ff->playback = uinput_dev_playback;
262		dev->ff->set_gain = uinput_dev_set_gain;
263		dev->ff->set_autocenter = uinput_dev_set_autocenter;
264	}
265
266	error = input_register_device(udev->dev);
267	if (error)
268		goto fail2;
269
270	udev->state = UIST_CREATED;
271
272	return 0;
273
274 fail2:	input_ff_destroy(dev);
275 fail1: uinput_destroy_device(udev);
276	return error;
277}
278
279static int uinput_open(struct inode *inode, struct file *file)
280{
281	struct uinput_device *newdev;
282
283	newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL);
284	if (!newdev)
285		return -ENOMEM;
286
287	mutex_init(&newdev->mutex);
288	spin_lock_init(&newdev->requests_lock);
289	init_waitqueue_head(&newdev->requests_waitq);
290	init_waitqueue_head(&newdev->waitq);
291	newdev->state = UIST_NEW_DEVICE;
292
293	file->private_data = newdev;
294	nonseekable_open(inode, file);
295
296	return 0;
297}
298
299static int uinput_validate_absbits(struct input_dev *dev)
300{
301	unsigned int cnt;
302	int retval = 0;
303
304	for (cnt = 0; cnt < ABS_CNT; cnt++) {
305		int min, max;
306		if (!test_bit(cnt, dev->absbit))
307			continue;
308
309		min = input_abs_get_min(dev, cnt);
310		max = input_abs_get_max(dev, cnt);
311
312		if ((min != 0 || max != 0) && max <= min) {
313			printk(KERN_DEBUG
314				"%s: invalid abs[%02x] min:%d max:%d\n",
315				UINPUT_NAME, cnt,
316				input_abs_get_min(dev, cnt),
317				input_abs_get_max(dev, cnt));
318			retval = -EINVAL;
319			break;
320		}
321
322		if (input_abs_get_flat(dev, cnt) >
323		    input_abs_get_max(dev, cnt) - input_abs_get_min(dev, cnt)) {
324			printk(KERN_DEBUG
325				"%s: abs_flat #%02x out of range: %d "
326				"(min:%d/max:%d)\n",
327				UINPUT_NAME, cnt,
328				input_abs_get_flat(dev, cnt),
329				input_abs_get_min(dev, cnt),
330				input_abs_get_max(dev, cnt));
331			retval = -EINVAL;
332			break;
333		}
334	}
335	return retval;
336}
337
338static int uinput_allocate_device(struct uinput_device *udev)
339{
340	udev->dev = input_allocate_device();
341	if (!udev->dev)
342		return -ENOMEM;
343
344	udev->dev->event = uinput_dev_event;
345	input_set_drvdata(udev->dev, udev);
346
347	return 0;
348}
349
350static int uinput_setup_device(struct uinput_device *udev, const char __user *buffer, size_t count)
351{
352	struct uinput_user_dev	*user_dev;
353	struct input_dev	*dev;
354	int			i;
355	int			retval;
356
357	if (count != sizeof(struct uinput_user_dev))
358		return -EINVAL;
359
360	if (!udev->dev) {
361		retval = uinput_allocate_device(udev);
362		if (retval)
363			return retval;
364	}
365
366	dev = udev->dev;
367
368	user_dev = memdup_user(buffer, sizeof(struct uinput_user_dev));
369	if (IS_ERR(user_dev))
370		return PTR_ERR(user_dev);
371
372	udev->ff_effects_max = user_dev->ff_effects_max;
373
374	/* Ensure name is filled in */
375	if (!user_dev->name[0]) {
376		retval = -EINVAL;
377		goto exit;
378	}
379
380	kfree(dev->name);
381	dev->name = kstrndup(user_dev->name, UINPUT_MAX_NAME_SIZE,
382			     GFP_KERNEL);
383	if (!dev->name) {
384		retval = -ENOMEM;
385		goto exit;
386	}
387
388	dev->id.bustype	= user_dev->id.bustype;
389	dev->id.vendor	= user_dev->id.vendor;
390	dev->id.product	= user_dev->id.product;
391	dev->id.version	= user_dev->id.version;
392
393	for (i = 0; i < ABS_CNT; i++) {
394		input_abs_set_max(dev, i, user_dev->absmax[i]);
395		input_abs_set_min(dev, i, user_dev->absmin[i]);
396		input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]);
397		input_abs_set_flat(dev, i, user_dev->absflat[i]);
398	}
399
400	/* check if absmin/absmax/absfuzz/absflat are filled as
401	 * told in Documentation/input/input-programming.txt */
402	if (test_bit(EV_ABS, dev->evbit)) {
403		retval = uinput_validate_absbits(dev);
404		if (retval < 0)
405			goto exit;
406		if (test_bit(ABS_MT_SLOT, dev->absbit)) {
407			int nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1;
408			input_mt_init_slots(dev, nslot);
409		} else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
410			input_set_events_per_packet(dev, 60);
411		}
412	}
413
414	udev->state = UIST_SETUP_COMPLETE;
415	retval = count;
416
417 exit:
418	kfree(user_dev);
419	return retval;
420}
421
422static inline ssize_t uinput_inject_event(struct uinput_device *udev, const char __user *buffer, size_t count)
423{
424	struct input_event ev;
425
426	if (count < input_event_size())
427		return -EINVAL;
428
429	if (input_event_from_user(buffer, &ev))
430		return -EFAULT;
431
432	input_event(udev->dev, ev.type, ev.code, ev.value);
433
434	return input_event_size();
435}
436
437static ssize_t uinput_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
438{
439	struct uinput_device *udev = file->private_data;
440	int retval;
441
442	retval = mutex_lock_interruptible(&udev->mutex);
443	if (retval)
444		return retval;
445
446	retval = udev->state == UIST_CREATED ?
447			uinput_inject_event(udev, buffer, count) :
448			uinput_setup_device(udev, buffer, count);
449
450	mutex_unlock(&udev->mutex);
451
452	return retval;
453}
454
455static ssize_t uinput_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
456{
457	struct uinput_device *udev = file->private_data;
458	int retval = 0;
459
460	if (udev->state != UIST_CREATED)
461		return -ENODEV;
462
463	if (udev->head == udev->tail && (file->f_flags & O_NONBLOCK))
464		return -EAGAIN;
465
466	retval = wait_event_interruptible(udev->waitq,
467			udev->head != udev->tail || udev->state != UIST_CREATED);
468	if (retval)
469		return retval;
470
471	retval = mutex_lock_interruptible(&udev->mutex);
472	if (retval)
473		return retval;
474
475	if (udev->state != UIST_CREATED) {
476		retval = -ENODEV;
477		goto out;
478	}
479
480	while (udev->head != udev->tail && retval + input_event_size() <= count) {
481		if (input_event_to_user(buffer + retval, &udev->buff[udev->tail])) {
482			retval = -EFAULT;
483			goto out;
484		}
485		udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
486		retval += input_event_size();
487	}
488
489 out:
490	mutex_unlock(&udev->mutex);
491
492	return retval;
493}
494
495static unsigned int uinput_poll(struct file *file, poll_table *wait)
496{
497	struct uinput_device *udev = file->private_data;
498
499	poll_wait(file, &udev->waitq, wait);
500
501	if (udev->head != udev->tail)
502		return POLLIN | POLLRDNORM;
503
504	return 0;
505}
506
507static int uinput_release(struct inode *inode, struct file *file)
508{
509	struct uinput_device *udev = file->private_data;
510
511	uinput_destroy_device(udev);
512	kfree(udev);
513
514	return 0;
515}
516
517#ifdef CONFIG_COMPAT
518struct uinput_ff_upload_compat {
519	int			request_id;
520	int			retval;
521	struct ff_effect_compat	effect;
522	struct ff_effect_compat	old;
523};
524
525static int uinput_ff_upload_to_user(char __user *buffer,
526				    const struct uinput_ff_upload *ff_up)
527{
528	if (INPUT_COMPAT_TEST) {
529		struct uinput_ff_upload_compat ff_up_compat;
530
531		ff_up_compat.request_id = ff_up->request_id;
532		ff_up_compat.retval = ff_up->retval;
533		/*
534		 * It so happens that the pointer that gives us the trouble
535		 * is the last field in the structure. Since we don't support
536		 * custom waveforms in uinput anyway we can just copy the whole
537		 * thing (to the compat size) and ignore the pointer.
538		 */
539		memcpy(&ff_up_compat.effect, &ff_up->effect,
540			sizeof(struct ff_effect_compat));
541		memcpy(&ff_up_compat.old, &ff_up->old,
542			sizeof(struct ff_effect_compat));
543
544		if (copy_to_user(buffer, &ff_up_compat,
545				 sizeof(struct uinput_ff_upload_compat)))
546			return -EFAULT;
547	} else {
548		if (copy_to_user(buffer, ff_up,
549				 sizeof(struct uinput_ff_upload)))
550			return -EFAULT;
551	}
552
553	return 0;
554}
555
556static int uinput_ff_upload_from_user(const char __user *buffer,
557				      struct uinput_ff_upload *ff_up)
558{
559	if (INPUT_COMPAT_TEST) {
560		struct uinput_ff_upload_compat ff_up_compat;
561
562		if (copy_from_user(&ff_up_compat, buffer,
563				   sizeof(struct uinput_ff_upload_compat)))
564			return -EFAULT;
565
566		ff_up->request_id = ff_up_compat.request_id;
567		ff_up->retval = ff_up_compat.retval;
568		memcpy(&ff_up->effect, &ff_up_compat.effect,
569			sizeof(struct ff_effect_compat));
570		memcpy(&ff_up->old, &ff_up_compat.old,
571			sizeof(struct ff_effect_compat));
572
573	} else {
574		if (copy_from_user(ff_up, buffer,
575				   sizeof(struct uinput_ff_upload)))
576			return -EFAULT;
577	}
578
579	return 0;
580}
581
582#else
583
584static int uinput_ff_upload_to_user(char __user *buffer,
585				    const struct uinput_ff_upload *ff_up)
586{
587	if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload)))
588		return -EFAULT;
589
590	return 0;
591}
592
593static int uinput_ff_upload_from_user(const char __user *buffer,
594				      struct uinput_ff_upload *ff_up)
595{
596	if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload)))
597		return -EFAULT;
598
599	return 0;
600}
601
602#endif
603
604#define uinput_set_bit(_arg, _bit, _max)		\
605({							\
606	int __ret = 0;					\
607	if (udev->state == UIST_CREATED)		\
608		__ret =  -EINVAL;			\
609	else if ((_arg) > (_max))			\
610		__ret = -EINVAL;			\
611	else set_bit((_arg), udev->dev->_bit);		\
612	__ret;						\
613})
614
615static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
616				 unsigned long arg, void __user *p)
617{
618	int			retval;
619	struct uinput_device	*udev = file->private_data;
620	struct uinput_ff_upload ff_up;
621	struct uinput_ff_erase  ff_erase;
622	struct uinput_request   *req;
623	char			*phys;
624
625	retval = mutex_lock_interruptible(&udev->mutex);
626	if (retval)
627		return retval;
628
629	if (!udev->dev) {
630		retval = uinput_allocate_device(udev);
631		if (retval)
632			goto out;
633	}
634
635	switch (cmd) {
636		case UI_DEV_CREATE:
637			retval = uinput_create_device(udev);
638			break;
639
640		case UI_DEV_DESTROY:
641			uinput_destroy_device(udev);
642			break;
643
644		case UI_SET_EVBIT:
645			retval = uinput_set_bit(arg, evbit, EV_MAX);
646			break;
647
648		case UI_SET_KEYBIT:
649			retval = uinput_set_bit(arg, keybit, KEY_MAX);
650			break;
651
652		case UI_SET_RELBIT:
653			retval = uinput_set_bit(arg, relbit, REL_MAX);
654			break;
655
656		case UI_SET_ABSBIT:
657			retval = uinput_set_bit(arg, absbit, ABS_MAX);
658			break;
659
660		case UI_SET_MSCBIT:
661			retval = uinput_set_bit(arg, mscbit, MSC_MAX);
662			break;
663
664		case UI_SET_LEDBIT:
665			retval = uinput_set_bit(arg, ledbit, LED_MAX);
666			break;
667
668		case UI_SET_SNDBIT:
669			retval = uinput_set_bit(arg, sndbit, SND_MAX);
670			break;
671
672		case UI_SET_FFBIT:
673			retval = uinput_set_bit(arg, ffbit, FF_MAX);
674			break;
675
676		case UI_SET_SWBIT:
677			retval = uinput_set_bit(arg, swbit, SW_MAX);
678			break;
679
680		case UI_SET_PROPBIT:
681			retval = uinput_set_bit(arg, propbit, INPUT_PROP_MAX);
682			break;
683
684		case UI_SET_PHYS:
685			if (udev->state == UIST_CREATED) {
686				retval = -EINVAL;
687				goto out;
688			}
689
690			phys = strndup_user(p, 1024);
691			if (IS_ERR(phys)) {
692				retval = PTR_ERR(phys);
693				goto out;
694			}
695
696			kfree(udev->dev->phys);
697			udev->dev->phys = phys;
698			break;
699
700		case UI_BEGIN_FF_UPLOAD:
701			retval = uinput_ff_upload_from_user(p, &ff_up);
702			if (retval)
703				break;
704
705			req = uinput_request_find(udev, ff_up.request_id);
706			if (!req || req->code != UI_FF_UPLOAD || !req->u.upload.effect) {
707				retval = -EINVAL;
708				break;
709			}
710
711			ff_up.retval = 0;
712			ff_up.effect = *req->u.upload.effect;
713			if (req->u.upload.old)
714				ff_up.old = *req->u.upload.old;
715			else
716				memset(&ff_up.old, 0, sizeof(struct ff_effect));
717
718			retval = uinput_ff_upload_to_user(p, &ff_up);
719			break;
720
721		case UI_BEGIN_FF_ERASE:
722			if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
723				retval = -EFAULT;
724				break;
725			}
726
727			req = uinput_request_find(udev, ff_erase.request_id);
728			if (!req || req->code != UI_FF_ERASE) {
729				retval = -EINVAL;
730				break;
731			}
732
733			ff_erase.retval = 0;
734			ff_erase.effect_id = req->u.effect_id;
735			if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
736				retval = -EFAULT;
737				break;
738			}
739
740			break;
741
742		case UI_END_FF_UPLOAD:
743			retval = uinput_ff_upload_from_user(p, &ff_up);
744			if (retval)
745				break;
746
747			req = uinput_request_find(udev, ff_up.request_id);
748			if (!req || req->code != UI_FF_UPLOAD ||
749			    !req->u.upload.effect) {
750				retval = -EINVAL;
751				break;
752			}
753
754			req->retval = ff_up.retval;
755			uinput_request_done(udev, req);
756			break;
757
758		case UI_END_FF_ERASE:
759			if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
760				retval = -EFAULT;
761				break;
762			}
763
764			req = uinput_request_find(udev, ff_erase.request_id);
765			if (!req || req->code != UI_FF_ERASE) {
766				retval = -EINVAL;
767				break;
768			}
769
770			req->retval = ff_erase.retval;
771			uinput_request_done(udev, req);
772			break;
773
774		default:
775			retval = -EINVAL;
776	}
777
778 out:
779	mutex_unlock(&udev->mutex);
780	return retval;
781}
782
783static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
784{
785	return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg);
786}
787
788#ifdef CONFIG_COMPAT
789static long uinput_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
790{
791	return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg));
792}
793#endif
794
795static const struct file_operations uinput_fops = {
796	.owner		= THIS_MODULE,
797	.open		= uinput_open,
798	.release	= uinput_release,
799	.read		= uinput_read,
800	.write		= uinput_write,
801	.poll		= uinput_poll,
802	.unlocked_ioctl	= uinput_ioctl,
803#ifdef CONFIG_COMPAT
804	.compat_ioctl	= uinput_compat_ioctl,
805#endif
806	.llseek		= no_llseek,
807};
808
809static struct miscdevice uinput_misc = {
810	.fops		= &uinput_fops,
811	.minor		= UINPUT_MINOR,
812	.name		= UINPUT_NAME,
813};
814MODULE_ALIAS_MISCDEV(UINPUT_MINOR);
815MODULE_ALIAS("devname:" UINPUT_NAME);
816
817static int __init uinput_init(void)
818{
819	return misc_register(&uinput_misc);
820}
821
822static void __exit uinput_exit(void)
823{
824	misc_deregister(&uinput_misc);
825}
826
827MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
828MODULE_DESCRIPTION("User level driver support for input subsystem");
829MODULE_LICENSE("GPL");
830MODULE_VERSION("0.3");
831
832module_init(uinput_init);
833module_exit(uinput_exit);
834