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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris...
[linux/fpc-iii.git] / drivers / input / misc / uinput.c
blob772835938a526ed2575f6bc187619fe962ac0e6c
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,
44 unsigned int type, unsigned int code, int value)
45 {
46 struct uinput_device *udev = input_get_drvdata(dev);
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
59 /* Atomically allocate an ID for the given request. Returns 0 on success. */
60 static bool uinput_request_alloc_id(struct uinput_device *udev,
61 struct uinput_request *request)
62 {
63 unsigned int id;
64 bool reserved = false;
65
66 spin_lock(&udev->requests_lock);
67
68 for (id = 0; id < UINPUT_NUM_REQUESTS; id++) {
69 if (!udev->requests[id]) {
70 request->id = id;
71 udev->requests[id] = request;
72 reserved = true;
73 break;
74 }
75 }
76
77 spin_unlock(&udev->requests_lock);
78 return reserved;
79 }
80
81 static struct uinput_request *uinput_request_find(struct uinput_device *udev,
82 unsigned int id)
83 {
84 /* Find an input request, by ID. Returns NULL if the ID isn't valid. */
85 if (id >= UINPUT_NUM_REQUESTS)
86 return NULL;
87
88 return udev->requests[id];
89 }
90
91 static int uinput_request_reserve_slot(struct uinput_device *udev,
92 struct uinput_request *request)
93 {
94 /* Allocate slot. If none are available right away, wait. */
95 return wait_event_interruptible(udev->requests_waitq,
96 uinput_request_alloc_id(udev, request));
97 }
98
99 static void uinput_request_done(struct uinput_device *udev,
100 struct uinput_request *request)
101 {
102 /* Mark slot as available */
103 udev->requests[request->id] = NULL;
104 wake_up(&udev->requests_waitq);
105
106 complete(&request->done);
107 }
108
109 static int uinput_request_send(struct uinput_device *udev,
110 struct uinput_request *request)
111 {
112 int retval;
113
114 retval = mutex_lock_interruptible(&udev->mutex);
115 if (retval)
116 return retval;
117
118 if (udev->state != UIST_CREATED) {
119 retval = -ENODEV;
120 goto out;
121 }
122
123 init_completion(&request->done);
124
125 /*
126 * Tell our userspace application about this new request
127 * by queueing an input event.
128 */
129 uinput_dev_event(udev->dev, EV_UINPUT, request->code, request->id);
130
131 out:
132 mutex_unlock(&udev->mutex);
133 return retval;
134 }
135
136 static int uinput_request_submit(struct uinput_device *udev,
137 struct uinput_request *request)
138 {
139 int error;
140
141 error = uinput_request_reserve_slot(udev, request);
142 if (error)
143 return error;
144
145 error = uinput_request_send(udev, request);
146 if (error) {
147 uinput_request_done(udev, request);
148 return error;
149 }
150
151 wait_for_completion(&request->done);
152 return request->retval;
153 }
154
155 /*
156 * Fail all outstanding requests so handlers don't wait for the userspace
157 * to finish processing them.
158 */
159 static void uinput_flush_requests(struct uinput_device *udev)
160 {
161 struct uinput_request *request;
162 int i;
163
164 spin_lock(&udev->requests_lock);
165
166 for (i = 0; i < UINPUT_NUM_REQUESTS; i++) {
167 request = udev->requests[i];
168 if (request) {
169 request->retval = -ENODEV;
170 uinput_request_done(udev, request);
171 }
172 }
173
174 spin_unlock(&udev->requests_lock);
175 }
176
177 static void uinput_dev_set_gain(struct input_dev *dev, u16 gain)
178 {
179 uinput_dev_event(dev, EV_FF, FF_GAIN, gain);
180 }
181
182 static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude)
183 {
184 uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude);
185 }
186
187 static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value)
188 {
189 return uinput_dev_event(dev, EV_FF, effect_id, value);
190 }
191
192 static int uinput_dev_upload_effect(struct input_dev *dev,
193 struct ff_effect *effect,
194 struct ff_effect *old)
195 {
196 struct uinput_device *udev = input_get_drvdata(dev);
197 struct uinput_request request;
198
199 /*
200 * uinput driver does not currently support periodic effects with
201 * custom waveform since it does not have a way to pass buffer of
202 * samples (custom_data) to userspace. If ever there is a device
203 * supporting custom waveforms we would need to define an additional
204 * ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out.
205 */
206 if (effect->type == FF_PERIODIC &&
207 effect->u.periodic.waveform == FF_CUSTOM)
208 return -EINVAL;
209
210 request.code = UI_FF_UPLOAD;
211 request.u.upload.effect = effect;
212 request.u.upload.old = old;
213
214 return uinput_request_submit(udev, &request);
215 }
216
217 static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id)
218 {
219 struct uinput_device *udev = input_get_drvdata(dev);
220 struct uinput_request request;
221
222 if (!test_bit(EV_FF, dev->evbit))
223 return -ENOSYS;
224
225 request.code = UI_FF_ERASE;
226 request.u.effect_id = effect_id;
227
228 return uinput_request_submit(udev, &request);
229 }
230
231 static void uinput_destroy_device(struct uinput_device *udev)
232 {
233 const char *name, *phys;
234 struct input_dev *dev = udev->dev;
235 enum uinput_state old_state = udev->state;
236
237 udev->state = UIST_NEW_DEVICE;
238
239 if (dev) {
240 name = dev->name;
241 phys = dev->phys;
242 if (old_state == UIST_CREATED) {
243 uinput_flush_requests(udev);
244 input_unregister_device(dev);
245 } else {
246 input_free_device(dev);
247 }
248 kfree(name);
249 kfree(phys);
250 udev->dev = NULL;
251 }
252 }
253
254 static int uinput_create_device(struct uinput_device *udev)
255 {
256 struct input_dev *dev = udev->dev;
257 int error;
258
259 if (udev->state != UIST_SETUP_COMPLETE) {
260 printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
261 return -EINVAL;
262 }
263
264 if (udev->ff_effects_max) {
265 error = input_ff_create(dev, udev->ff_effects_max);
266 if (error)
267 goto fail1;
268
269 dev->ff->upload = uinput_dev_upload_effect;
270 dev->ff->erase = uinput_dev_erase_effect;
271 dev->ff->playback = uinput_dev_playback;
272 dev->ff->set_gain = uinput_dev_set_gain;
273 dev->ff->set_autocenter = uinput_dev_set_autocenter;
274 }
275
276 error = input_register_device(udev->dev);
277 if (error)
278 goto fail2;
279
280 udev->state = UIST_CREATED;
281
282 return 0;
283
284 fail2: input_ff_destroy(dev);
285 fail1: uinput_destroy_device(udev);
286 return error;
287 }
288
289 static int uinput_open(struct inode *inode, struct file *file)
290 {
291 struct uinput_device *newdev;
292
293 newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL);
294 if (!newdev)
295 return -ENOMEM;
296
297 mutex_init(&newdev->mutex);
298 spin_lock_init(&newdev->requests_lock);
299 init_waitqueue_head(&newdev->requests_waitq);
300 init_waitqueue_head(&newdev->waitq);
301 newdev->state = UIST_NEW_DEVICE;
302
303 file->private_data = newdev;
304 nonseekable_open(inode, file);
305
306 return 0;
307 }
308
309 static int uinput_validate_absbits(struct input_dev *dev)
310 {
311 unsigned int cnt;
312 int retval = 0;
313
314 for (cnt = 0; cnt < ABS_CNT; cnt++) {
315 int min, max;
316 if (!test_bit(cnt, dev->absbit))
317 continue;
318
319 min = input_abs_get_min(dev, cnt);
320 max = input_abs_get_max(dev, cnt);
321
322 if ((min != 0 || max != 0) && max <= min) {
323 printk(KERN_DEBUG
324 "%s: invalid abs[%02x] min:%d max:%d\n",
325 UINPUT_NAME, cnt,
326 input_abs_get_min(dev, cnt),
327 input_abs_get_max(dev, cnt));
328 retval = -EINVAL;
329 break;
330 }
331
332 if (input_abs_get_flat(dev, cnt) >
333 input_abs_get_max(dev, cnt) - input_abs_get_min(dev, cnt)) {
334 printk(KERN_DEBUG
335 "%s: abs_flat #%02x out of range: %d "
336 "(min:%d/max:%d)\n",
337 UINPUT_NAME, cnt,
338 input_abs_get_flat(dev, cnt),
339 input_abs_get_min(dev, cnt),
340 input_abs_get_max(dev, cnt));
341 retval = -EINVAL;
342 break;
343 }
344 }
345 return retval;
346 }
347
348 static int uinput_allocate_device(struct uinput_device *udev)
349 {
350 udev->dev = input_allocate_device();
351 if (!udev->dev)
352 return -ENOMEM;
353
354 udev->dev->event = uinput_dev_event;
355 input_set_drvdata(udev->dev, udev);
356
357 return 0;
358 }
359
360 static int uinput_setup_device(struct uinput_device *udev,
361 const char __user *buffer, size_t count)
362 {
363 struct uinput_user_dev *user_dev;
364 struct input_dev *dev;
365 int i;
366 int retval;
367
368 if (count != sizeof(struct uinput_user_dev))
369 return -EINVAL;
370
371 if (!udev->dev) {
372 retval = uinput_allocate_device(udev);
373 if (retval)
374 return retval;
375 }
376
377 dev = udev->dev;
378
379 user_dev = memdup_user(buffer, sizeof(struct uinput_user_dev));
380 if (IS_ERR(user_dev))
381 return PTR_ERR(user_dev);
382
383 udev->ff_effects_max = user_dev->ff_effects_max;
384
385 /* Ensure name is filled in */
386 if (!user_dev->name[0]) {
387 retval = -EINVAL;
388 goto exit;
389 }
390
391 kfree(dev->name);
392 dev->name = kstrndup(user_dev->name, UINPUT_MAX_NAME_SIZE,
393 GFP_KERNEL);
394 if (!dev->name) {
395 retval = -ENOMEM;
396 goto exit;
397 }
398
399 dev->id.bustype = user_dev->id.bustype;
400 dev->id.vendor = user_dev->id.vendor;
401 dev->id.product = user_dev->id.product;
402 dev->id.version = user_dev->id.version;
403
404 for (i = 0; i < ABS_CNT; i++) {
405 input_abs_set_max(dev, i, user_dev->absmax[i]);
406 input_abs_set_min(dev, i, user_dev->absmin[i]);
407 input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]);
408 input_abs_set_flat(dev, i, user_dev->absflat[i]);
409 }
410
411 /* check if absmin/absmax/absfuzz/absflat are filled as
412 * told in Documentation/input/input-programming.txt */
413 if (test_bit(EV_ABS, dev->evbit)) {
414 retval = uinput_validate_absbits(dev);
415 if (retval < 0)
416 goto exit;
417 if (test_bit(ABS_MT_SLOT, dev->absbit)) {
418 int nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1;
419 input_mt_init_slots(dev, nslot, 0);
420 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
421 input_set_events_per_packet(dev, 60);
422 }
423 }
424
425 udev->state = UIST_SETUP_COMPLETE;
426 retval = count;
427
428 exit:
429 kfree(user_dev);
430 return retval;
431 }
432
433 static ssize_t uinput_inject_events(struct uinput_device *udev,
434 const char __user *buffer, size_t count)
435 {
436 struct input_event ev;
437 size_t bytes = 0;
438
439 if (count != 0 && count < input_event_size())
440 return -EINVAL;
441
442 while (bytes + input_event_size() <= count) {
443 /*
444 * Note that even if some events were fetched successfully
445 * we are still going to return EFAULT instead of partial
446 * count to let userspace know that it got it's buffers
447 * all wrong.
448 */
449 if (input_event_from_user(buffer + bytes, &ev))
450 return -EFAULT;
451
452 input_event(udev->dev, ev.type, ev.code, ev.value);
453 bytes += input_event_size();
454 }
455
456 return bytes;
457 }
458
459 static ssize_t uinput_write(struct file *file, const char __user *buffer,
460 size_t count, loff_t *ppos)
461 {
462 struct uinput_device *udev = file->private_data;
463 int retval;
464
465 if (count == 0)
466 return 0;
467
468 retval = mutex_lock_interruptible(&udev->mutex);
469 if (retval)
470 return retval;
471
472 retval = udev->state == UIST_CREATED ?
473 uinput_inject_events(udev, buffer, count) :
474 uinput_setup_device(udev, buffer, count);
475
476 mutex_unlock(&udev->mutex);
477
478 return retval;
479 }
480
481 static bool uinput_fetch_next_event(struct uinput_device *udev,
482 struct input_event *event)
483 {
484 bool have_event;
485
486 spin_lock_irq(&udev->dev->event_lock);
487
488 have_event = udev->head != udev->tail;
489 if (have_event) {
490 *event = udev->buff[udev->tail];
491 udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
492 }
493
494 spin_unlock_irq(&udev->dev->event_lock);
495
496 return have_event;
497 }
498
499 static ssize_t uinput_events_to_user(struct uinput_device *udev,
500 char __user *buffer, size_t count)
501 {
502 struct input_event event;
503 size_t read = 0;
504
505 while (read + input_event_size() <= count &&
506 uinput_fetch_next_event(udev, &event)) {
507
508 if (input_event_to_user(buffer + read, &event))
509 return -EFAULT;
510
511 read += input_event_size();
512 }
513
514 return read;
515 }
516
517 static ssize_t uinput_read(struct file *file, char __user *buffer,
518 size_t count, loff_t *ppos)
519 {
520 struct uinput_device *udev = file->private_data;
521 ssize_t retval;
522
523 if (count != 0 && count < input_event_size())
524 return -EINVAL;
525
526 do {
527 retval = mutex_lock_interruptible(&udev->mutex);
528 if (retval)
529 return retval;
530
531 if (udev->state != UIST_CREATED)
532 retval = -ENODEV;
533 else if (udev->head == udev->tail &&
534 (file->f_flags & O_NONBLOCK))
535 retval = -EAGAIN;
536 else
537 retval = uinput_events_to_user(udev, buffer, count);
538
539 mutex_unlock(&udev->mutex);
540
541 if (retval || count == 0)
542 break;
543
544 if (!(file->f_flags & O_NONBLOCK))
545 retval = wait_event_interruptible(udev->waitq,
546 udev->head != udev->tail ||
547 udev->state != UIST_CREATED);
548 } while (retval == 0);
549
550 return retval;
551 }
552
553 static unsigned int uinput_poll(struct file *file, poll_table *wait)
554 {
555 struct uinput_device *udev = file->private_data;
556
557 poll_wait(file, &udev->waitq, wait);
558
559 if (udev->head != udev->tail)
560 return POLLIN | POLLRDNORM;
561
562 return 0;
563 }
564
565 static int uinput_release(struct inode *inode, struct file *file)
566 {
567 struct uinput_device *udev = file->private_data;
568
569 uinput_destroy_device(udev);
570 kfree(udev);
571
572 return 0;
573 }
574
575 #ifdef CONFIG_COMPAT
576 struct uinput_ff_upload_compat {
577 __u32 request_id;
578 __s32 retval;
579 struct ff_effect_compat effect;
580 struct ff_effect_compat old;
581 };
582
583 static int uinput_ff_upload_to_user(char __user *buffer,
584 const struct uinput_ff_upload *ff_up)
585 {
586 if (INPUT_COMPAT_TEST) {
587 struct uinput_ff_upload_compat ff_up_compat;
588
589 ff_up_compat.request_id = ff_up->request_id;
590 ff_up_compat.retval = ff_up->retval;
591 /*
592 * It so happens that the pointer that gives us the trouble
593 * is the last field in the structure. Since we don't support
594 * custom waveforms in uinput anyway we can just copy the whole
595 * thing (to the compat size) and ignore the pointer.
596 */
597 memcpy(&ff_up_compat.effect, &ff_up->effect,
598 sizeof(struct ff_effect_compat));
599 memcpy(&ff_up_compat.old, &ff_up->old,
600 sizeof(struct ff_effect_compat));
601
602 if (copy_to_user(buffer, &ff_up_compat,
603 sizeof(struct uinput_ff_upload_compat)))
604 return -EFAULT;
605 } else {
606 if (copy_to_user(buffer, ff_up,
607 sizeof(struct uinput_ff_upload)))
608 return -EFAULT;
609 }
610
611 return 0;
612 }
613
614 static int uinput_ff_upload_from_user(const char __user *buffer,
615 struct uinput_ff_upload *ff_up)
616 {
617 if (INPUT_COMPAT_TEST) {
618 struct uinput_ff_upload_compat ff_up_compat;
619
620 if (copy_from_user(&ff_up_compat, buffer,
621 sizeof(struct uinput_ff_upload_compat)))
622 return -EFAULT;
623
624 ff_up->request_id = ff_up_compat.request_id;
625 ff_up->retval = ff_up_compat.retval;
626 memcpy(&ff_up->effect, &ff_up_compat.effect,
627 sizeof(struct ff_effect_compat));
628 memcpy(&ff_up->old, &ff_up_compat.old,
629 sizeof(struct ff_effect_compat));
630
631 } else {
632 if (copy_from_user(ff_up, buffer,
633 sizeof(struct uinput_ff_upload)))
634 return -EFAULT;
635 }
636
637 return 0;
638 }
639
640 #else
641
642 static int uinput_ff_upload_to_user(char __user *buffer,
643 const struct uinput_ff_upload *ff_up)
644 {
645 if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload)))
646 return -EFAULT;
647
648 return 0;
649 }
650
651 static int uinput_ff_upload_from_user(const char __user *buffer,
652 struct uinput_ff_upload *ff_up)
653 {
654 if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload)))
655 return -EFAULT;
656
657 return 0;
658 }
659
660 #endif
661
662 #define uinput_set_bit(_arg, _bit, _max) \
663 ({ \
664 int __ret = 0; \
665 if (udev->state == UIST_CREATED) \
666 __ret = -EINVAL; \
667 else if ((_arg) > (_max)) \
668 __ret = -EINVAL; \
669 else set_bit((_arg), udev->dev->_bit); \
670 __ret; \
671 })
672
673 static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
674 unsigned long arg, void __user *p)
675 {
676 int retval;
677 struct uinput_device *udev = file->private_data;
678 struct uinput_ff_upload ff_up;
679 struct uinput_ff_erase ff_erase;
680 struct uinput_request *req;
681 char *phys;
682
683 retval = mutex_lock_interruptible(&udev->mutex);
684 if (retval)
685 return retval;
686
687 if (!udev->dev) {
688 retval = uinput_allocate_device(udev);
689 if (retval)
690 goto out;
691 }
692
693 switch (cmd) {
694 case UI_DEV_CREATE:
695 retval = uinput_create_device(udev);
696 break;
697
698 case UI_DEV_DESTROY:
699 uinput_destroy_device(udev);
700 break;
701
702 case UI_SET_EVBIT:
703 retval = uinput_set_bit(arg, evbit, EV_MAX);
704 break;
705
706 case UI_SET_KEYBIT:
707 retval = uinput_set_bit(arg, keybit, KEY_MAX);
708 break;
709
710 case UI_SET_RELBIT:
711 retval = uinput_set_bit(arg, relbit, REL_MAX);
712 break;
713
714 case UI_SET_ABSBIT:
715 retval = uinput_set_bit(arg, absbit, ABS_MAX);
716 break;
717
718 case UI_SET_MSCBIT:
719 retval = uinput_set_bit(arg, mscbit, MSC_MAX);
720 break;
721
722 case UI_SET_LEDBIT:
723 retval = uinput_set_bit(arg, ledbit, LED_MAX);
724 break;
725
726 case UI_SET_SNDBIT:
727 retval = uinput_set_bit(arg, sndbit, SND_MAX);
728 break;
729
730 case UI_SET_FFBIT:
731 retval = uinput_set_bit(arg, ffbit, FF_MAX);
732 break;
733
734 case UI_SET_SWBIT:
735 retval = uinput_set_bit(arg, swbit, SW_MAX);
736 break;
737
738 case UI_SET_PROPBIT:
739 retval = uinput_set_bit(arg, propbit, INPUT_PROP_MAX);
740 break;
741
742 case UI_SET_PHYS:
743 if (udev->state == UIST_CREATED) {
744 retval = -EINVAL;
745 goto out;
746 }
747
748 phys = strndup_user(p, 1024);
749 if (IS_ERR(phys)) {
750 retval = PTR_ERR(phys);
751 goto out;
752 }
753
754 kfree(udev->dev->phys);
755 udev->dev->phys = phys;
756 break;
757
758 case UI_BEGIN_FF_UPLOAD:
759 retval = uinput_ff_upload_from_user(p, &ff_up);
760 if (retval)
761 break;
762
763 req = uinput_request_find(udev, ff_up.request_id);
764 if (!req || req->code != UI_FF_UPLOAD ||
765 !req->u.upload.effect) {
766 retval = -EINVAL;
767 break;
768 }
769
770 ff_up.retval = 0;
771 ff_up.effect = *req->u.upload.effect;
772 if (req->u.upload.old)
773 ff_up.old = *req->u.upload.old;
774 else
775 memset(&ff_up.old, 0, sizeof(struct ff_effect));
776
777 retval = uinput_ff_upload_to_user(p, &ff_up);
778 break;
779
780 case UI_BEGIN_FF_ERASE:
781 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
782 retval = -EFAULT;
783 break;
784 }
785
786 req = uinput_request_find(udev, ff_erase.request_id);
787 if (!req || req->code != UI_FF_ERASE) {
788 retval = -EINVAL;
789 break;
790 }
791
792 ff_erase.retval = 0;
793 ff_erase.effect_id = req->u.effect_id;
794 if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
795 retval = -EFAULT;
796 break;
797 }
798
799 break;
800
801 case UI_END_FF_UPLOAD:
802 retval = uinput_ff_upload_from_user(p, &ff_up);
803 if (retval)
804 break;
805
806 req = uinput_request_find(udev, ff_up.request_id);
807 if (!req || req->code != UI_FF_UPLOAD ||
808 !req->u.upload.effect) {
809 retval = -EINVAL;
810 break;
811 }
812
813 req->retval = ff_up.retval;
814 uinput_request_done(udev, req);
815 break;
816
817 case UI_END_FF_ERASE:
818 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
819 retval = -EFAULT;
820 break;
821 }
822
823 req = uinput_request_find(udev, ff_erase.request_id);
824 if (!req || req->code != UI_FF_ERASE) {
825 retval = -EINVAL;
826 break;
827 }
828
829 req->retval = ff_erase.retval;
830 uinput_request_done(udev, req);
831 break;
832
833 default:
834 retval = -EINVAL;
835 }
836
837 out:
838 mutex_unlock(&udev->mutex);
839 return retval;
840 }
841
842 static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
843 {
844 return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg);
845 }
846
847 #ifdef CONFIG_COMPAT
848 static long uinput_compat_ioctl(struct file *file,
849 unsigned int cmd, unsigned long arg)
850 {
851 return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg));
852 }
853 #endif
854
855 static const struct file_operations uinput_fops = {
856 .owner = THIS_MODULE,
857 .open = uinput_open,
858 .release = uinput_release,
859 .read = uinput_read,
860 .write = uinput_write,
861 .poll = uinput_poll,
862 .unlocked_ioctl = uinput_ioctl,
863 #ifdef CONFIG_COMPAT
864 .compat_ioctl = uinput_compat_ioctl,
865 #endif
866 .llseek = no_llseek,
867 };
868
869 static struct miscdevice uinput_misc = {
870 .fops = &uinput_fops,
871 .minor = UINPUT_MINOR,
872 .name = UINPUT_NAME,
873 };
874 MODULE_ALIAS_MISCDEV(UINPUT_MINOR);
875 MODULE_ALIAS("devname:" UINPUT_NAME);
876
877 static int __init uinput_init(void)
878 {
879 return misc_register(&uinput_misc);
880 }
881
882 static void __exit uinput_exit(void)
883 {
884 misc_deregister(&uinput_misc);
885 }
886
887 MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
888 MODULE_DESCRIPTION("User level driver support for input subsystem");
889 MODULE_LICENSE("GPL");
890 MODULE_VERSION("0.3");
891
892 module_init(uinput_init);
893 module_exit(uinput_exit);
Linux with added FPC-III support