Input: uinput - allow for 0/0 min/max on absolute axes.
[sfrench/cifs-2.6.git] / drivers / input / misc / uinput.c
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
43 static 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. */
59 static 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
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;
84
85         return udev->requests[id];
86 }
87
88 static 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
95 static 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
104 static 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  */
133 static 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
151 static void uinput_dev_set_gain(struct input_dev *dev, u16 gain)
152 {
153         uinput_dev_event(dev, EV_FF, FF_GAIN, gain);
154 }
155
156 static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude)
157 {
158         uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude);
159 }
160
161 static 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
166 static 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
198 static 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
221 static 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
244 static 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
279 static 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
299 static 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
338 static 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
350 static 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
422 static 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
437 static 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
455 static 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
495 static 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
507 static 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
518 struct 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
525 static 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
556 static 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
584 static 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
593 static 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
615 static 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
783 static 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
789 static 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
795 static 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
809 static struct miscdevice uinput_misc = {
810         .fops           = &uinput_fops,
811         .minor          = UINPUT_MINOR,
812         .name           = UINPUT_NAME,
813 };
814 MODULE_ALIAS_MISCDEV(UINPUT_MINOR);
815 MODULE_ALIAS("devname:" UINPUT_NAME);
816
817 static int __init uinput_init(void)
818 {
819         return misc_register(&uinput_misc);
820 }
821
822 static void __exit uinput_exit(void)
823 {
824         misc_deregister(&uinput_misc);
825 }
826
827 MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
828 MODULE_DESCRIPTION("User level driver support for input subsystem");
829 MODULE_LICENSE("GPL");
830 MODULE_VERSION("0.3");
831
832 module_init(uinput_init);
833 module_exit(uinput_exit);
834