Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl
[linux-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 "../input-compat.h"
41
42 static int uinput_dev_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
43 {
44         struct uinput_device    *udev = input_get_drvdata(dev);
45
46         udev->buff[udev->head].type = type;
47         udev->buff[udev->head].code = code;
48         udev->buff[udev->head].value = value;
49         do_gettimeofday(&udev->buff[udev->head].time);
50         udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE;
51
52         wake_up_interruptible(&udev->waitq);
53
54         return 0;
55 }
56
57 /* Atomically allocate an ID for the given request. Returns 0 on success. */
58 static int uinput_request_alloc_id(struct uinput_device *udev, struct uinput_request *request)
59 {
60         int id;
61         int err = -1;
62
63         spin_lock(&udev->requests_lock);
64
65         for (id = 0; id < UINPUT_NUM_REQUESTS; id++) {
66                 if (!udev->requests[id]) {
67                         request->id = id;
68                         udev->requests[id] = request;
69                         err = 0;
70                         break;
71                 }
72         }
73
74         spin_unlock(&udev->requests_lock);
75         return err;
76 }
77
78 static struct uinput_request *uinput_request_find(struct uinput_device *udev, int id)
79 {
80         /* Find an input request, by ID. Returns NULL if the ID isn't valid. */
81         if (id >= UINPUT_NUM_REQUESTS || id < 0)
82                 return NULL;
83
84         return udev->requests[id];
85 }
86
87 static inline int uinput_request_reserve_slot(struct uinput_device *udev, struct uinput_request *request)
88 {
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 }
93
94 static void uinput_request_done(struct uinput_device *udev, struct uinput_request *request)
95 {
96         /* Mark slot as available */
97         udev->requests[request->id] = NULL;
98         wake_up(&udev->requests_waitq);
99
100         complete(&request->done);
101 }
102
103 static int uinput_request_submit(struct uinput_device *udev, struct uinput_request *request)
104 {
105         int retval;
106
107         retval = uinput_request_reserve_slot(udev, request);
108         if (retval)
109                 return retval;
110
111         retval = mutex_lock_interruptible(&udev->mutex);
112         if (retval)
113                 return retval;
114
115         if (udev->state != UIST_CREATED) {
116                 retval = -ENODEV;
117                 goto out;
118         }
119
120         /* Tell our userspace app about this new request by queueing an input event */
121         uinput_dev_event(udev->dev, EV_UINPUT, request->code, request->id);
122
123  out:
124         mutex_unlock(&udev->mutex);
125         return retval;
126 }
127
128 /*
129  * Fail all ouitstanding requests so handlers don't wait for the userspace
130  * to finish processing them.
131  */
132 static void uinput_flush_requests(struct uinput_device *udev)
133 {
134         struct uinput_request *request;
135         int i;
136
137         spin_lock(&udev->requests_lock);
138
139         for (i = 0; i < UINPUT_NUM_REQUESTS; i++) {
140                 request = udev->requests[i];
141                 if (request) {
142                         request->retval = -ENODEV;
143                         uinput_request_done(udev, request);
144                 }
145         }
146
147         spin_unlock(&udev->requests_lock);
148 }
149
150 static void uinput_dev_set_gain(struct input_dev *dev, u16 gain)
151 {
152         uinput_dev_event(dev, EV_FF, FF_GAIN, gain);
153 }
154
155 static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude)
156 {
157         uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude);
158 }
159
160 static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value)
161 {
162         return uinput_dev_event(dev, EV_FF, effect_id, value);
163 }
164
165 static int uinput_dev_upload_effect(struct input_dev *dev, struct ff_effect *effect, struct ff_effect *old)
166 {
167         struct uinput_device *udev = input_get_drvdata(dev);
168         struct uinput_request request;
169         int retval;
170
171         /*
172          * uinput driver does not currently support periodic effects with
173          * custom waveform since it does not have a way to pass buffer of
174          * samples (custom_data) to userspace. If ever there is a device
175          * supporting custom waveforms we would need to define an additional
176          * ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out.
177          */
178         if (effect->type == FF_PERIODIC &&
179                         effect->u.periodic.waveform == FF_CUSTOM)
180                 return -EINVAL;
181
182         request.id = -1;
183         init_completion(&request.done);
184         request.code = UI_FF_UPLOAD;
185         request.u.upload.effect = effect;
186         request.u.upload.old = old;
187
188         retval = uinput_request_submit(udev, &request);
189         if (!retval) {
190                 wait_for_completion(&request.done);
191                 retval = request.retval;
192         }
193
194         return retval;
195 }
196
197 static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id)
198 {
199         struct uinput_device *udev = input_get_drvdata(dev);
200         struct uinput_request request;
201         int retval;
202
203         if (!test_bit(EV_FF, dev->evbit))
204                 return -ENOSYS;
205
206         request.id = -1;
207         init_completion(&request.done);
208         request.code = UI_FF_ERASE;
209         request.u.effect_id = effect_id;
210
211         retval = uinput_request_submit(udev, &request);
212         if (!retval) {
213                 wait_for_completion(&request.done);
214                 retval = request.retval;
215         }
216
217         return retval;
218 }
219
220 static void uinput_destroy_device(struct uinput_device *udev)
221 {
222         const char *name, *phys;
223         struct input_dev *dev = udev->dev;
224         enum uinput_state old_state = udev->state;
225
226         udev->state = UIST_NEW_DEVICE;
227
228         if (dev) {
229                 name = dev->name;
230                 phys = dev->phys;
231                 if (old_state == UIST_CREATED) {
232                         uinput_flush_requests(udev);
233                         input_unregister_device(dev);
234                 } else {
235                         input_free_device(dev);
236                 }
237                 kfree(name);
238                 kfree(phys);
239                 udev->dev = NULL;
240         }
241 }
242
243 static int uinput_create_device(struct uinput_device *udev)
244 {
245         struct input_dev *dev = udev->dev;
246         int error;
247
248         if (udev->state != UIST_SETUP_COMPLETE) {
249                 printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
250                 return -EINVAL;
251         }
252
253         if (udev->ff_effects_max) {
254                 error = input_ff_create(dev, udev->ff_effects_max);
255                 if (error)
256                         goto fail1;
257
258                 dev->ff->upload = uinput_dev_upload_effect;
259                 dev->ff->erase = uinput_dev_erase_effect;
260                 dev->ff->playback = uinput_dev_playback;
261                 dev->ff->set_gain = uinput_dev_set_gain;
262                 dev->ff->set_autocenter = uinput_dev_set_autocenter;
263         }
264
265         error = input_register_device(udev->dev);
266         if (error)
267                 goto fail2;
268
269         udev->state = UIST_CREATED;
270
271         return 0;
272
273  fail2: input_ff_destroy(dev);
274  fail1: uinput_destroy_device(udev);
275         return error;
276 }
277
278 static int uinput_open(struct inode *inode, struct file *file)
279 {
280         struct uinput_device *newdev;
281
282         newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL);
283         if (!newdev)
284                 return -ENOMEM;
285
286         mutex_init(&newdev->mutex);
287         spin_lock_init(&newdev->requests_lock);
288         init_waitqueue_head(&newdev->requests_waitq);
289         init_waitqueue_head(&newdev->waitq);
290         newdev->state = UIST_NEW_DEVICE;
291
292         file->private_data = newdev;
293         nonseekable_open(inode, file);
294
295         return 0;
296 }
297
298 static int uinput_validate_absbits(struct input_dev *dev)
299 {
300         unsigned int cnt;
301         int retval = 0;
302
303         for (cnt = 0; cnt < ABS_CNT; cnt++) {
304                 if (!test_bit(cnt, dev->absbit))
305                         continue;
306
307                 if (input_abs_get_max(dev, cnt) <= input_abs_get_min(dev, cnt)) {
308                         printk(KERN_DEBUG
309                                 "%s: invalid abs[%02x] min:%d max:%d\n",
310                                 UINPUT_NAME, cnt,
311                                 input_abs_get_min(dev, cnt),
312                                 input_abs_get_max(dev, cnt));
313                         retval = -EINVAL;
314                         break;
315                 }
316
317                 if (input_abs_get_flat(dev, cnt) >
318                     input_abs_get_max(dev, cnt) - input_abs_get_min(dev, cnt)) {
319                         printk(KERN_DEBUG
320                                 "%s: abs_flat #%02x out of range: %d "
321                                 "(min:%d/max:%d)\n",
322                                 UINPUT_NAME, cnt,
323                                 input_abs_get_flat(dev, cnt),
324                                 input_abs_get_min(dev, cnt),
325                                 input_abs_get_max(dev, cnt));
326                         retval = -EINVAL;
327                         break;
328                 }
329         }
330         return retval;
331 }
332
333 static int uinput_allocate_device(struct uinput_device *udev)
334 {
335         udev->dev = input_allocate_device();
336         if (!udev->dev)
337                 return -ENOMEM;
338
339         udev->dev->event = uinput_dev_event;
340         input_set_drvdata(udev->dev, udev);
341
342         return 0;
343 }
344
345 static int uinput_setup_device(struct uinput_device *udev, const char __user *buffer, size_t count)
346 {
347         struct uinput_user_dev  *user_dev;
348         struct input_dev        *dev;
349         char                    *name;
350         int                     i, size;
351         int                     retval;
352
353         if (count != sizeof(struct uinput_user_dev))
354                 return -EINVAL;
355
356         if (!udev->dev) {
357                 retval = uinput_allocate_device(udev);
358                 if (retval)
359                         return retval;
360         }
361
362         dev = udev->dev;
363
364         user_dev = kmalloc(sizeof(struct uinput_user_dev), GFP_KERNEL);
365         if (!user_dev)
366                 return -ENOMEM;
367
368         if (copy_from_user(user_dev, buffer, sizeof(struct uinput_user_dev))) {
369                 retval = -EFAULT;
370                 goto exit;
371         }
372
373         udev->ff_effects_max = user_dev->ff_effects_max;
374
375         size = strnlen(user_dev->name, UINPUT_MAX_NAME_SIZE) + 1;
376         if (!size) {
377                 retval = -EINVAL;
378                 goto exit;
379         }
380
381         kfree(dev->name);
382         dev->name = name = kmalloc(size, GFP_KERNEL);
383         if (!name) {
384                 retval = -ENOMEM;
385                 goto exit;
386         }
387         strlcpy(name, user_dev->name, size);
388
389         dev->id.bustype = user_dev->id.bustype;
390         dev->id.vendor  = user_dev->id.vendor;
391         dev->id.product = user_dev->id.product;
392         dev->id.version = user_dev->id.version;
393
394         for (i = 0; i < ABS_CNT; i++) {
395                 input_abs_set_max(dev, i, user_dev->absmax[i]);
396                 input_abs_set_min(dev, i, user_dev->absmin[i]);
397                 input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]);
398                 input_abs_set_flat(dev, i, user_dev->absflat[i]);
399         }
400
401         /* check if absmin/absmax/absfuzz/absflat are filled as
402          * told in Documentation/input/input-programming.txt */
403         if (test_bit(EV_ABS, dev->evbit)) {
404                 retval = uinput_validate_absbits(dev);
405                 if (retval < 0)
406                         goto exit;
407                 if (test_bit(ABS_MT_SLOT, dev->absbit)) {
408                         int nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1;
409                         input_mt_create_slots(dev, nslot);
410                         input_set_events_per_packet(dev, 6 * nslot);
411                 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
412                         input_set_events_per_packet(dev, 60);
413                 }
414         }
415
416         udev->state = UIST_SETUP_COMPLETE;
417         retval = count;
418
419  exit:
420         kfree(user_dev);
421         return retval;
422 }
423
424 static inline ssize_t uinput_inject_event(struct uinput_device *udev, const char __user *buffer, size_t count)
425 {
426         struct input_event ev;
427
428         if (count < input_event_size())
429                 return -EINVAL;
430
431         if (input_event_from_user(buffer, &ev))
432                 return -EFAULT;
433
434         input_event(udev->dev, ev.type, ev.code, ev.value);
435
436         return input_event_size();
437 }
438
439 static ssize_t uinput_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
440 {
441         struct uinput_device *udev = file->private_data;
442         int retval;
443
444         retval = mutex_lock_interruptible(&udev->mutex);
445         if (retval)
446                 return retval;
447
448         retval = udev->state == UIST_CREATED ?
449                         uinput_inject_event(udev, buffer, count) :
450                         uinput_setup_device(udev, buffer, count);
451
452         mutex_unlock(&udev->mutex);
453
454         return retval;
455 }
456
457 static ssize_t uinput_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
458 {
459         struct uinput_device *udev = file->private_data;
460         int retval = 0;
461
462         if (udev->state != UIST_CREATED)
463                 return -ENODEV;
464
465         if (udev->head == udev->tail && (file->f_flags & O_NONBLOCK))
466                 return -EAGAIN;
467
468         retval = wait_event_interruptible(udev->waitq,
469                         udev->head != udev->tail || udev->state != UIST_CREATED);
470         if (retval)
471                 return retval;
472
473         retval = mutex_lock_interruptible(&udev->mutex);
474         if (retval)
475                 return retval;
476
477         if (udev->state != UIST_CREATED) {
478                 retval = -ENODEV;
479                 goto out;
480         }
481
482         while (udev->head != udev->tail && retval + input_event_size() <= count) {
483                 if (input_event_to_user(buffer + retval, &udev->buff[udev->tail])) {
484                         retval = -EFAULT;
485                         goto out;
486                 }
487                 udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
488                 retval += input_event_size();
489         }
490
491  out:
492         mutex_unlock(&udev->mutex);
493
494         return retval;
495 }
496
497 static unsigned int uinput_poll(struct file *file, poll_table *wait)
498 {
499         struct uinput_device *udev = file->private_data;
500
501         poll_wait(file, &udev->waitq, wait);
502
503         if (udev->head != udev->tail)
504                 return POLLIN | POLLRDNORM;
505
506         return 0;
507 }
508
509 static int uinput_release(struct inode *inode, struct file *file)
510 {
511         struct uinput_device *udev = file->private_data;
512
513         uinput_destroy_device(udev);
514         kfree(udev);
515
516         return 0;
517 }
518
519 #ifdef CONFIG_COMPAT
520 struct uinput_ff_upload_compat {
521         int                     request_id;
522         int                     retval;
523         struct ff_effect_compat effect;
524         struct ff_effect_compat old;
525 };
526
527 static int uinput_ff_upload_to_user(char __user *buffer,
528                                     const struct uinput_ff_upload *ff_up)
529 {
530         if (INPUT_COMPAT_TEST) {
531                 struct uinput_ff_upload_compat ff_up_compat;
532
533                 ff_up_compat.request_id = ff_up->request_id;
534                 ff_up_compat.retval = ff_up->retval;
535                 /*
536                  * It so happens that the pointer that gives us the trouble
537                  * is the last field in the structure. Since we don't support
538                  * custom waveforms in uinput anyway we can just copy the whole
539                  * thing (to the compat size) and ignore the pointer.
540                  */
541                 memcpy(&ff_up_compat.effect, &ff_up->effect,
542                         sizeof(struct ff_effect_compat));
543                 memcpy(&ff_up_compat.old, &ff_up->old,
544                         sizeof(struct ff_effect_compat));
545
546                 if (copy_to_user(buffer, &ff_up_compat,
547                                  sizeof(struct uinput_ff_upload_compat)))
548                         return -EFAULT;
549         } else {
550                 if (copy_to_user(buffer, ff_up,
551                                  sizeof(struct uinput_ff_upload)))
552                         return -EFAULT;
553         }
554
555         return 0;
556 }
557
558 static int uinput_ff_upload_from_user(const char __user *buffer,
559                                       struct uinput_ff_upload *ff_up)
560 {
561         if (INPUT_COMPAT_TEST) {
562                 struct uinput_ff_upload_compat ff_up_compat;
563
564                 if (copy_from_user(&ff_up_compat, buffer,
565                                    sizeof(struct uinput_ff_upload_compat)))
566                         return -EFAULT;
567
568                 ff_up->request_id = ff_up_compat.request_id;
569                 ff_up->retval = ff_up_compat.retval;
570                 memcpy(&ff_up->effect, &ff_up_compat.effect,
571                         sizeof(struct ff_effect_compat));
572                 memcpy(&ff_up->old, &ff_up_compat.old,
573                         sizeof(struct ff_effect_compat));
574
575         } else {
576                 if (copy_from_user(ff_up, buffer,
577                                    sizeof(struct uinput_ff_upload)))
578                         return -EFAULT;
579         }
580
581         return 0;
582 }
583
584 #else
585
586 static int uinput_ff_upload_to_user(char __user *buffer,
587                                     const struct uinput_ff_upload *ff_up)
588 {
589         if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload)))
590                 return -EFAULT;
591
592         return 0;
593 }
594
595 static int uinput_ff_upload_from_user(const char __user *buffer,
596                                       struct uinput_ff_upload *ff_up)
597 {
598         if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload)))
599                 return -EFAULT;
600
601         return 0;
602 }
603
604 #endif
605
606 #define uinput_set_bit(_arg, _bit, _max)                \
607 ({                                                      \
608         int __ret = 0;                                  \
609         if (udev->state == UIST_CREATED)                \
610                 __ret =  -EINVAL;                       \
611         else if ((_arg) > (_max))                       \
612                 __ret = -EINVAL;                        \
613         else set_bit((_arg), udev->dev->_bit);          \
614         __ret;                                          \
615 })
616
617 static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
618                                  unsigned long arg, void __user *p)
619 {
620         int                     retval;
621         struct uinput_device    *udev = file->private_data;
622         struct uinput_ff_upload ff_up;
623         struct uinput_ff_erase  ff_erase;
624         struct uinput_request   *req;
625         int                     length;
626         char                    *phys;
627
628         retval = mutex_lock_interruptible(&udev->mutex);
629         if (retval)
630                 return retval;
631
632         if (!udev->dev) {
633                 retval = uinput_allocate_device(udev);
634                 if (retval)
635                         goto out;
636         }
637
638         switch (cmd) {
639                 case UI_DEV_CREATE:
640                         retval = uinput_create_device(udev);
641                         break;
642
643                 case UI_DEV_DESTROY:
644                         uinput_destroy_device(udev);
645                         break;
646
647                 case UI_SET_EVBIT:
648                         retval = uinput_set_bit(arg, evbit, EV_MAX);
649                         break;
650
651                 case UI_SET_KEYBIT:
652                         retval = uinput_set_bit(arg, keybit, KEY_MAX);
653                         break;
654
655                 case UI_SET_RELBIT:
656                         retval = uinput_set_bit(arg, relbit, REL_MAX);
657                         break;
658
659                 case UI_SET_ABSBIT:
660                         retval = uinput_set_bit(arg, absbit, ABS_MAX);
661                         break;
662
663                 case UI_SET_MSCBIT:
664                         retval = uinput_set_bit(arg, mscbit, MSC_MAX);
665                         break;
666
667                 case UI_SET_LEDBIT:
668                         retval = uinput_set_bit(arg, ledbit, LED_MAX);
669                         break;
670
671                 case UI_SET_SNDBIT:
672                         retval = uinput_set_bit(arg, sndbit, SND_MAX);
673                         break;
674
675                 case UI_SET_FFBIT:
676                         retval = uinput_set_bit(arg, ffbit, FF_MAX);
677                         break;
678
679                 case UI_SET_SWBIT:
680                         retval = uinput_set_bit(arg, swbit, SW_MAX);
681                         break;
682
683                 case UI_SET_PHYS:
684                         if (udev->state == UIST_CREATED) {
685                                 retval = -EINVAL;
686                                 goto out;
687                         }
688                         length = strnlen_user(p, 1024);
689                         if (length <= 0) {
690                                 retval = -EFAULT;
691                                 break;
692                         }
693                         kfree(udev->dev->phys);
694                         udev->dev->phys = phys = kmalloc(length, GFP_KERNEL);
695                         if (!phys) {
696                                 retval = -ENOMEM;
697                                 break;
698                         }
699                         if (copy_from_user(phys, p, length)) {
700                                 udev->dev->phys = NULL;
701                                 kfree(phys);
702                                 retval = -EFAULT;
703                                 break;
704                         }
705                         phys[length - 1] = '\0';
706                         break;
707
708                 case UI_BEGIN_FF_UPLOAD:
709                         retval = uinput_ff_upload_from_user(p, &ff_up);
710                         if (retval)
711                                 break;
712
713                         req = uinput_request_find(udev, ff_up.request_id);
714                         if (!req || req->code != UI_FF_UPLOAD || !req->u.upload.effect) {
715                                 retval = -EINVAL;
716                                 break;
717                         }
718
719                         ff_up.retval = 0;
720                         ff_up.effect = *req->u.upload.effect;
721                         if (req->u.upload.old)
722                                 ff_up.old = *req->u.upload.old;
723                         else
724                                 memset(&ff_up.old, 0, sizeof(struct ff_effect));
725
726                         retval = uinput_ff_upload_to_user(p, &ff_up);
727                         break;
728
729                 case UI_BEGIN_FF_ERASE:
730                         if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
731                                 retval = -EFAULT;
732                                 break;
733                         }
734
735                         req = uinput_request_find(udev, ff_erase.request_id);
736                         if (!req || req->code != UI_FF_ERASE) {
737                                 retval = -EINVAL;
738                                 break;
739                         }
740
741                         ff_erase.retval = 0;
742                         ff_erase.effect_id = req->u.effect_id;
743                         if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
744                                 retval = -EFAULT;
745                                 break;
746                         }
747
748                         break;
749
750                 case UI_END_FF_UPLOAD:
751                         retval = uinput_ff_upload_from_user(p, &ff_up);
752                         if (retval)
753                                 break;
754
755                         req = uinput_request_find(udev, ff_up.request_id);
756                         if (!req || req->code != UI_FF_UPLOAD ||
757                             !req->u.upload.effect) {
758                                 retval = -EINVAL;
759                                 break;
760                         }
761
762                         req->retval = ff_up.retval;
763                         uinput_request_done(udev, req);
764                         break;
765
766                 case UI_END_FF_ERASE:
767                         if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
768                                 retval = -EFAULT;
769                                 break;
770                         }
771
772                         req = uinput_request_find(udev, ff_erase.request_id);
773                         if (!req || req->code != UI_FF_ERASE) {
774                                 retval = -EINVAL;
775                                 break;
776                         }
777
778                         req->retval = ff_erase.retval;
779                         uinput_request_done(udev, req);
780                         break;
781
782                 default:
783                         retval = -EINVAL;
784         }
785
786  out:
787         mutex_unlock(&udev->mutex);
788         return retval;
789 }
790
791 static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
792 {
793         return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg);
794 }
795
796 #ifdef CONFIG_COMPAT
797 static long uinput_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
798 {
799         return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg));
800 }
801 #endif
802
803 static const struct file_operations uinput_fops = {
804         .owner          = THIS_MODULE,
805         .open           = uinput_open,
806         .release        = uinput_release,
807         .read           = uinput_read,
808         .write          = uinput_write,
809         .poll           = uinput_poll,
810         .unlocked_ioctl = uinput_ioctl,
811 #ifdef CONFIG_COMPAT
812         .compat_ioctl   = uinput_compat_ioctl,
813 #endif
814         .llseek         = no_llseek,
815 };
816
817 static struct miscdevice uinput_misc = {
818         .fops           = &uinput_fops,
819         .minor          = UINPUT_MINOR,
820         .name           = UINPUT_NAME,
821 };
822 MODULE_ALIAS_MISCDEV(UINPUT_MINOR);
823 MODULE_ALIAS("devname:" UINPUT_NAME);
824
825 static int __init uinput_init(void)
826 {
827         return misc_register(&uinput_misc);
828 }
829
830 static void __exit uinput_exit(void)
831 {
832         misc_deregister(&uinput_misc);
833 }
834
835 MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
836 MODULE_DESCRIPTION("User level driver support for input subsystem");
837 MODULE_LICENSE("GPL");
838 MODULE_VERSION("0.3");
839
840 module_init(uinput_init);
841 module_exit(uinput_exit);
842