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of: MSI: Simplify irqdomain lookup
[linux/fpc-iii.git] / drivers / input / misc / uinput.c
blob5adbcedcb81cf4391bfdddefe11aae5d3131dd76
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 * 0.4 01/09/2014 (Benjamin Tissoires <benjamin.tissoires@redhat.com>)
24 * - add UI_GET_SYSNAME ioctl
25 * 0.3 09/04/2006 (Anssi Hannula <anssi.hannula@gmail.com>)
26 * - updated ff support for the changes in kernel interface
27 * - added MODULE_VERSION
28 * 0.2 16/10/2004 (Micah Dowty <micah@navi.cx>)
29 * - added force feedback support
30 * - added UI_SET_PHYS
31 * 0.1 20/06/2002
32 * - first public version
33 */
34 #include <linux/poll.h>
35 #include <linux/sched.h>
36 #include <linux/slab.h>
37 #include <linux/module.h>
38 #include <linux/init.h>
39 #include <linux/fs.h>
40 #include <linux/miscdevice.h>
41 #include <linux/uinput.h>
42 #include <linux/input/mt.h>
43 #include "../input-compat.h"
44
45 static int uinput_dev_event(struct input_dev *dev,
46 unsigned int type, unsigned int code, int value)
47 {
48 struct uinput_device *udev = input_get_drvdata(dev);
49
50 udev->buff[udev->head].type = type;
51 udev->buff[udev->head].code = code;
52 udev->buff[udev->head].value = value;
53 do_gettimeofday(&udev->buff[udev->head].time);
54 udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE;
55
56 wake_up_interruptible(&udev->waitq);
57
58 return 0;
59 }
60
61 /* Atomically allocate an ID for the given request. Returns 0 on success. */
62 static bool uinput_request_alloc_id(struct uinput_device *udev,
63 struct uinput_request *request)
64 {
65 unsigned int id;
66 bool reserved = false;
67
68 spin_lock(&udev->requests_lock);
69
70 for (id = 0; id < UINPUT_NUM_REQUESTS; id++) {
71 if (!udev->requests[id]) {
72 request->id = id;
73 udev->requests[id] = request;
74 reserved = true;
75 break;
76 }
77 }
78
79 spin_unlock(&udev->requests_lock);
80 return reserved;
81 }
82
83 static struct uinput_request *uinput_request_find(struct uinput_device *udev,
84 unsigned int id)
85 {
86 /* Find an input request, by ID. Returns NULL if the ID isn't valid. */
87 if (id >= UINPUT_NUM_REQUESTS)
88 return NULL;
89
90 return udev->requests[id];
91 }
92
93 static int uinput_request_reserve_slot(struct uinput_device *udev,
94 struct uinput_request *request)
95 {
96 /* Allocate slot. If none are available right away, wait. */
97 return wait_event_interruptible(udev->requests_waitq,
98 uinput_request_alloc_id(udev, request));
99 }
100
101 static void uinput_request_done(struct uinput_device *udev,
102 struct uinput_request *request)
103 {
104 /* Mark slot as available */
105 udev->requests[request->id] = NULL;
106 wake_up(&udev->requests_waitq);
107
108 complete(&request->done);
109 }
110
111 static int uinput_request_send(struct uinput_device *udev,
112 struct uinput_request *request)
113 {
114 int retval;
115
116 retval = mutex_lock_interruptible(&udev->mutex);
117 if (retval)
118 return retval;
119
120 if (udev->state != UIST_CREATED) {
121 retval = -ENODEV;
122 goto out;
123 }
124
125 init_completion(&request->done);
126
127 /*
128 * Tell our userspace application about this new request
129 * by queueing an input event.
130 */
131 uinput_dev_event(udev->dev, EV_UINPUT, request->code, request->id);
132
133 out:
134 mutex_unlock(&udev->mutex);
135 return retval;
136 }
137
138 static int uinput_request_submit(struct uinput_device *udev,
139 struct uinput_request *request)
140 {
141 int error;
142
143 error = uinput_request_reserve_slot(udev, request);
144 if (error)
145 return error;
146
147 error = uinput_request_send(udev, request);
148 if (error) {
149 uinput_request_done(udev, request);
150 return error;
151 }
152
153 wait_for_completion(&request->done);
154 return request->retval;
155 }
156
157 /*
158 * Fail all outstanding requests so handlers don't wait for the userspace
159 * to finish processing them.
160 */
161 static void uinput_flush_requests(struct uinput_device *udev)
162 {
163 struct uinput_request *request;
164 int i;
165
166 spin_lock(&udev->requests_lock);
167
168 for (i = 0; i < UINPUT_NUM_REQUESTS; i++) {
169 request = udev->requests[i];
170 if (request) {
171 request->retval = -ENODEV;
172 uinput_request_done(udev, request);
173 }
174 }
175
176 spin_unlock(&udev->requests_lock);
177 }
178
179 static void uinput_dev_set_gain(struct input_dev *dev, u16 gain)
180 {
181 uinput_dev_event(dev, EV_FF, FF_GAIN, gain);
182 }
183
184 static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude)
185 {
186 uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude);
187 }
188
189 static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value)
190 {
191 return uinput_dev_event(dev, EV_FF, effect_id, value);
192 }
193
194 static int uinput_dev_upload_effect(struct input_dev *dev,
195 struct ff_effect *effect,
196 struct ff_effect *old)
197 {
198 struct uinput_device *udev = input_get_drvdata(dev);
199 struct uinput_request request;
200
201 /*
202 * uinput driver does not currently support periodic effects with
203 * custom waveform since it does not have a way to pass buffer of
204 * samples (custom_data) to userspace. If ever there is a device
205 * supporting custom waveforms we would need to define an additional
206 * ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out.
207 */
208 if (effect->type == FF_PERIODIC &&
209 effect->u.periodic.waveform == FF_CUSTOM)
210 return -EINVAL;
211
212 request.code = UI_FF_UPLOAD;
213 request.u.upload.effect = effect;
214 request.u.upload.old = old;
215
216 return uinput_request_submit(udev, &request);
217 }
218
219 static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id)
220 {
221 struct uinput_device *udev = input_get_drvdata(dev);
222 struct uinput_request request;
223
224 if (!test_bit(EV_FF, dev->evbit))
225 return -ENOSYS;
226
227 request.code = UI_FF_ERASE;
228 request.u.effect_id = effect_id;
229
230 return uinput_request_submit(udev, &request);
231 }
232
233 static void uinput_destroy_device(struct uinput_device *udev)
234 {
235 const char *name, *phys;
236 struct input_dev *dev = udev->dev;
237 enum uinput_state old_state = udev->state;
238
239 udev->state = UIST_NEW_DEVICE;
240
241 if (dev) {
242 name = dev->name;
243 phys = dev->phys;
244 if (old_state == UIST_CREATED) {
245 uinput_flush_requests(udev);
246 input_unregister_device(dev);
247 } else {
248 input_free_device(dev);
249 }
250 kfree(name);
251 kfree(phys);
252 udev->dev = NULL;
253 }
254 }
255
256 static int uinput_create_device(struct uinput_device *udev)
257 {
258 struct input_dev *dev = udev->dev;
259 int error;
260
261 if (udev->state != UIST_SETUP_COMPLETE) {
262 printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
263 return -EINVAL;
264 }
265
266 if (udev->ff_effects_max) {
267 error = input_ff_create(dev, udev->ff_effects_max);
268 if (error)
269 goto fail1;
270
271 dev->ff->upload = uinput_dev_upload_effect;
272 dev->ff->erase = uinput_dev_erase_effect;
273 dev->ff->playback = uinput_dev_playback;
274 dev->ff->set_gain = uinput_dev_set_gain;
275 dev->ff->set_autocenter = uinput_dev_set_autocenter;
276 }
277
278 error = input_register_device(udev->dev);
279 if (error)
280 goto fail2;
281
282 udev->state = UIST_CREATED;
283
284 return 0;
285
286 fail2: input_ff_destroy(dev);
287 fail1: uinput_destroy_device(udev);
288 return error;
289 }
290
291 static int uinput_open(struct inode *inode, struct file *file)
292 {
293 struct uinput_device *newdev;
294
295 newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL);
296 if (!newdev)
297 return -ENOMEM;
298
299 mutex_init(&newdev->mutex);
300 spin_lock_init(&newdev->requests_lock);
301 init_waitqueue_head(&newdev->requests_waitq);
302 init_waitqueue_head(&newdev->waitq);
303 newdev->state = UIST_NEW_DEVICE;
304
305 file->private_data = newdev;
306 nonseekable_open(inode, file);
307
308 return 0;
309 }
310
311 static int uinput_validate_absbits(struct input_dev *dev)
312 {
313 unsigned int cnt;
314 int nslot;
315
316 if (!test_bit(EV_ABS, dev->evbit))
317 return 0;
318
319 /*
320 * Check if absmin/absmax/absfuzz/absflat are sane.
321 */
322
323 for_each_set_bit(cnt, dev->absbit, ABS_CNT) {
324 int min, max;
325
326 min = input_abs_get_min(dev, cnt);
327 max = input_abs_get_max(dev, cnt);
328
329 if ((min != 0 || max != 0) && max <= min) {
330 printk(KERN_DEBUG
331 "%s: invalid abs[%02x] min:%d max:%d\n",
332 UINPUT_NAME, cnt,
333 input_abs_get_min(dev, cnt),
334 input_abs_get_max(dev, cnt));
335 return -EINVAL;
336 }
337
338 if (input_abs_get_flat(dev, cnt) >
339 input_abs_get_max(dev, cnt) - input_abs_get_min(dev, cnt)) {
340 printk(KERN_DEBUG
341 "%s: abs_flat #%02x out of range: %d "
342 "(min:%d/max:%d)\n",
343 UINPUT_NAME, cnt,
344 input_abs_get_flat(dev, cnt),
345 input_abs_get_min(dev, cnt),
346 input_abs_get_max(dev, cnt));
347 return -EINVAL;
348 }
349 }
350
351 if (test_bit(ABS_MT_SLOT, dev->absbit)) {
352 nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1;
353 input_mt_init_slots(dev, nslot, 0);
354 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
355 input_set_events_per_packet(dev, 60);
356 }
357
358 return 0;
359 }
360
361 static int uinput_allocate_device(struct uinput_device *udev)
362 {
363 udev->dev = input_allocate_device();
364 if (!udev->dev)
365 return -ENOMEM;
366
367 udev->dev->event = uinput_dev_event;
368 input_set_drvdata(udev->dev, udev);
369
370 return 0;
371 }
372
373 static int uinput_setup_device(struct uinput_device *udev,
374 const char __user *buffer, size_t count)
375 {
376 struct uinput_user_dev *user_dev;
377 struct input_dev *dev;
378 int i;
379 int retval;
380
381 if (count != sizeof(struct uinput_user_dev))
382 return -EINVAL;
383
384 if (!udev->dev) {
385 retval = uinput_allocate_device(udev);
386 if (retval)
387 return retval;
388 }
389
390 dev = udev->dev;
391
392 user_dev = memdup_user(buffer, sizeof(struct uinput_user_dev));
393 if (IS_ERR(user_dev))
394 return PTR_ERR(user_dev);
395
396 udev->ff_effects_max = user_dev->ff_effects_max;
397
398 /* Ensure name is filled in */
399 if (!user_dev->name[0]) {
400 retval = -EINVAL;
401 goto exit;
402 }
403
404 kfree(dev->name);
405 dev->name = kstrndup(user_dev->name, UINPUT_MAX_NAME_SIZE,
406 GFP_KERNEL);
407 if (!dev->name) {
408 retval = -ENOMEM;
409 goto exit;
410 }
411
412 dev->id.bustype = user_dev->id.bustype;
413 dev->id.vendor = user_dev->id.vendor;
414 dev->id.product = user_dev->id.product;
415 dev->id.version = user_dev->id.version;
416
417 for (i = 0; i < ABS_CNT; i++) {
418 input_abs_set_max(dev, i, user_dev->absmax[i]);
419 input_abs_set_min(dev, i, user_dev->absmin[i]);
420 input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]);
421 input_abs_set_flat(dev, i, user_dev->absflat[i]);
422 }
423
424 retval = uinput_validate_absbits(dev);
425 if (retval < 0)
426 goto exit;
427
428 udev->state = UIST_SETUP_COMPLETE;
429 retval = count;
430
431 exit:
432 kfree(user_dev);
433 return retval;
434 }
435
436 static ssize_t uinput_inject_events(struct uinput_device *udev,
437 const char __user *buffer, size_t count)
438 {
439 struct input_event ev;
440 size_t bytes = 0;
441
442 if (count != 0 && count < input_event_size())
443 return -EINVAL;
444
445 while (bytes + input_event_size() <= count) {
446 /*
447 * Note that even if some events were fetched successfully
448 * we are still going to return EFAULT instead of partial
449 * count to let userspace know that it got it's buffers
450 * all wrong.
451 */
452 if (input_event_from_user(buffer + bytes, &ev))
453 return -EFAULT;
454
455 input_event(udev->dev, ev.type, ev.code, ev.value);
456 bytes += input_event_size();
457 }
458
459 return bytes;
460 }
461
462 static ssize_t uinput_write(struct file *file, const char __user *buffer,
463 size_t count, loff_t *ppos)
464 {
465 struct uinput_device *udev = file->private_data;
466 int retval;
467
468 if (count == 0)
469 return 0;
470
471 retval = mutex_lock_interruptible(&udev->mutex);
472 if (retval)
473 return retval;
474
475 retval = udev->state == UIST_CREATED ?
476 uinput_inject_events(udev, buffer, count) :
477 uinput_setup_device(udev, buffer, count);
478
479 mutex_unlock(&udev->mutex);
480
481 return retval;
482 }
483
484 static bool uinput_fetch_next_event(struct uinput_device *udev,
485 struct input_event *event)
486 {
487 bool have_event;
488
489 spin_lock_irq(&udev->dev->event_lock);
490
491 have_event = udev->head != udev->tail;
492 if (have_event) {
493 *event = udev->buff[udev->tail];
494 udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
495 }
496
497 spin_unlock_irq(&udev->dev->event_lock);
498
499 return have_event;
500 }
501
502 static ssize_t uinput_events_to_user(struct uinput_device *udev,
503 char __user *buffer, size_t count)
504 {
505 struct input_event event;
506 size_t read = 0;
507
508 while (read + input_event_size() <= count &&
509 uinput_fetch_next_event(udev, &event)) {
510
511 if (input_event_to_user(buffer + read, &event))
512 return -EFAULT;
513
514 read += input_event_size();
515 }
516
517 return read;
518 }
519
520 static ssize_t uinput_read(struct file *file, char __user *buffer,
521 size_t count, loff_t *ppos)
522 {
523 struct uinput_device *udev = file->private_data;
524 ssize_t retval;
525
526 if (count != 0 && count < input_event_size())
527 return -EINVAL;
528
529 do {
530 retval = mutex_lock_interruptible(&udev->mutex);
531 if (retval)
532 return retval;
533
534 if (udev->state != UIST_CREATED)
535 retval = -ENODEV;
536 else if (udev->head == udev->tail &&
537 (file->f_flags & O_NONBLOCK))
538 retval = -EAGAIN;
539 else
540 retval = uinput_events_to_user(udev, buffer, count);
541
542 mutex_unlock(&udev->mutex);
543
544 if (retval || count == 0)
545 break;
546
547 if (!(file->f_flags & O_NONBLOCK))
548 retval = wait_event_interruptible(udev->waitq,
549 udev->head != udev->tail ||
550 udev->state != UIST_CREATED);
551 } while (retval == 0);
552
553 return retval;
554 }
555
556 static unsigned int uinput_poll(struct file *file, poll_table *wait)
557 {
558 struct uinput_device *udev = file->private_data;
559
560 poll_wait(file, &udev->waitq, wait);
561
562 if (udev->head != udev->tail)
563 return POLLIN | POLLRDNORM;
564
565 return 0;
566 }
567
568 static int uinput_release(struct inode *inode, struct file *file)
569 {
570 struct uinput_device *udev = file->private_data;
571
572 uinput_destroy_device(udev);
573 kfree(udev);
574
575 return 0;
576 }
577
578 #ifdef CONFIG_COMPAT
579 struct uinput_ff_upload_compat {
580 __u32 request_id;
581 __s32 retval;
582 struct ff_effect_compat effect;
583 struct ff_effect_compat old;
584 };
585
586 static int uinput_ff_upload_to_user(char __user *buffer,
587 const struct uinput_ff_upload *ff_up)
588 {
589 if (INPUT_COMPAT_TEST) {
590 struct uinput_ff_upload_compat ff_up_compat;
591
592 ff_up_compat.request_id = ff_up->request_id;
593 ff_up_compat.retval = ff_up->retval;
594 /*
595 * It so happens that the pointer that gives us the trouble
596 * is the last field in the structure. Since we don't support
597 * custom waveforms in uinput anyway we can just copy the whole
598 * thing (to the compat size) and ignore the pointer.
599 */
600 memcpy(&ff_up_compat.effect, &ff_up->effect,
601 sizeof(struct ff_effect_compat));
602 memcpy(&ff_up_compat.old, &ff_up->old,
603 sizeof(struct ff_effect_compat));
604
605 if (copy_to_user(buffer, &ff_up_compat,
606 sizeof(struct uinput_ff_upload_compat)))
607 return -EFAULT;
608 } else {
609 if (copy_to_user(buffer, ff_up,
610 sizeof(struct uinput_ff_upload)))
611 return -EFAULT;
612 }
613
614 return 0;
615 }
616
617 static int uinput_ff_upload_from_user(const char __user *buffer,
618 struct uinput_ff_upload *ff_up)
619 {
620 if (INPUT_COMPAT_TEST) {
621 struct uinput_ff_upload_compat ff_up_compat;
622
623 if (copy_from_user(&ff_up_compat, buffer,
624 sizeof(struct uinput_ff_upload_compat)))
625 return -EFAULT;
626
627 ff_up->request_id = ff_up_compat.request_id;
628 ff_up->retval = ff_up_compat.retval;
629 memcpy(&ff_up->effect, &ff_up_compat.effect,
630 sizeof(struct ff_effect_compat));
631 memcpy(&ff_up->old, &ff_up_compat.old,
632 sizeof(struct ff_effect_compat));
633
634 } else {
635 if (copy_from_user(ff_up, buffer,
636 sizeof(struct uinput_ff_upload)))
637 return -EFAULT;
638 }
639
640 return 0;
641 }
642
643 #else
644
645 static int uinput_ff_upload_to_user(char __user *buffer,
646 const struct uinput_ff_upload *ff_up)
647 {
648 if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload)))
649 return -EFAULT;
650
651 return 0;
652 }
653
654 static int uinput_ff_upload_from_user(const char __user *buffer,
655 struct uinput_ff_upload *ff_up)
656 {
657 if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload)))
658 return -EFAULT;
659
660 return 0;
661 }
662
663 #endif
664
665 #define uinput_set_bit(_arg, _bit, _max) \
666 ({ \
667 int __ret = 0; \
668 if (udev->state == UIST_CREATED) \
669 __ret = -EINVAL; \
670 else if ((_arg) > (_max)) \
671 __ret = -EINVAL; \
672 else set_bit((_arg), udev->dev->_bit); \
673 __ret; \
674 })
675
676 static int uinput_str_to_user(void __user *dest, const char *str,
677 unsigned int maxlen)
678 {
679 char __user *p = dest;
680 int len, ret;
681
682 if (!str)
683 return -ENOENT;
684
685 if (maxlen == 0)
686 return -EINVAL;
687
688 len = strlen(str) + 1;
689 if (len > maxlen)
690 len = maxlen;
691
692 ret = copy_to_user(p, str, len);
693 if (ret)
694 return -EFAULT;
695
696 /* force terminating '\0' */
697 ret = put_user(0, p + len - 1);
698 return ret ? -EFAULT : len;
699 }
700
701 static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
702 unsigned long arg, void __user *p)
703 {
704 int retval;
705 struct uinput_device *udev = file->private_data;
706 struct uinput_ff_upload ff_up;
707 struct uinput_ff_erase ff_erase;
708 struct uinput_request *req;
709 char *phys;
710 const char *name;
711 unsigned int size;
712
713 retval = mutex_lock_interruptible(&udev->mutex);
714 if (retval)
715 return retval;
716
717 if (!udev->dev) {
718 retval = uinput_allocate_device(udev);
719 if (retval)
720 goto out;
721 }
722
723 switch (cmd) {
724 case UI_GET_VERSION:
725 if (put_user(UINPUT_VERSION,
726 (unsigned int __user *)p))
727 retval = -EFAULT;
728 goto out;
729
730 case UI_DEV_CREATE:
731 retval = uinput_create_device(udev);
732 goto out;
733
734 case UI_DEV_DESTROY:
735 uinput_destroy_device(udev);
736 goto out;
737
738 case UI_SET_EVBIT:
739 retval = uinput_set_bit(arg, evbit, EV_MAX);
740 goto out;
741
742 case UI_SET_KEYBIT:
743 retval = uinput_set_bit(arg, keybit, KEY_MAX);
744 goto out;
745
746 case UI_SET_RELBIT:
747 retval = uinput_set_bit(arg, relbit, REL_MAX);
748 goto out;
749
750 case UI_SET_ABSBIT:
751 retval = uinput_set_bit(arg, absbit, ABS_MAX);
752 goto out;
753
754 case UI_SET_MSCBIT:
755 retval = uinput_set_bit(arg, mscbit, MSC_MAX);
756 goto out;
757
758 case UI_SET_LEDBIT:
759 retval = uinput_set_bit(arg, ledbit, LED_MAX);
760 goto out;
761
762 case UI_SET_SNDBIT:
763 retval = uinput_set_bit(arg, sndbit, SND_MAX);
764 goto out;
765
766 case UI_SET_FFBIT:
767 retval = uinput_set_bit(arg, ffbit, FF_MAX);
768 goto out;
769
770 case UI_SET_SWBIT:
771 retval = uinput_set_bit(arg, swbit, SW_MAX);
772 goto out;
773
774 case UI_SET_PROPBIT:
775 retval = uinput_set_bit(arg, propbit, INPUT_PROP_MAX);
776 goto out;
777
778 case UI_SET_PHYS:
779 if (udev->state == UIST_CREATED) {
780 retval = -EINVAL;
781 goto out;
782 }
783
784 phys = strndup_user(p, 1024);
785 if (IS_ERR(phys)) {
786 retval = PTR_ERR(phys);
787 goto out;
788 }
789
790 kfree(udev->dev->phys);
791 udev->dev->phys = phys;
792 goto out;
793
794 case UI_BEGIN_FF_UPLOAD:
795 retval = uinput_ff_upload_from_user(p, &ff_up);
796 if (retval)
797 goto out;
798
799 req = uinput_request_find(udev, ff_up.request_id);
800 if (!req || req->code != UI_FF_UPLOAD ||
801 !req->u.upload.effect) {
802 retval = -EINVAL;
803 goto out;
804 }
805
806 ff_up.retval = 0;
807 ff_up.effect = *req->u.upload.effect;
808 if (req->u.upload.old)
809 ff_up.old = *req->u.upload.old;
810 else
811 memset(&ff_up.old, 0, sizeof(struct ff_effect));
812
813 retval = uinput_ff_upload_to_user(p, &ff_up);
814 goto out;
815
816 case UI_BEGIN_FF_ERASE:
817 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
818 retval = -EFAULT;
819 goto out;
820 }
821
822 req = uinput_request_find(udev, ff_erase.request_id);
823 if (!req || req->code != UI_FF_ERASE) {
824 retval = -EINVAL;
825 goto out;
826 }
827
828 ff_erase.retval = 0;
829 ff_erase.effect_id = req->u.effect_id;
830 if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
831 retval = -EFAULT;
832 goto out;
833 }
834
835 goto out;
836
837 case UI_END_FF_UPLOAD:
838 retval = uinput_ff_upload_from_user(p, &ff_up);
839 if (retval)
840 goto out;
841
842 req = uinput_request_find(udev, ff_up.request_id);
843 if (!req || req->code != UI_FF_UPLOAD ||
844 !req->u.upload.effect) {
845 retval = -EINVAL;
846 goto out;
847 }
848
849 req->retval = ff_up.retval;
850 uinput_request_done(udev, req);
851 goto out;
852
853 case UI_END_FF_ERASE:
854 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
855 retval = -EFAULT;
856 goto out;
857 }
858
859 req = uinput_request_find(udev, ff_erase.request_id);
860 if (!req || req->code != UI_FF_ERASE) {
861 retval = -EINVAL;
862 goto out;
863 }
864
865 req->retval = ff_erase.retval;
866 uinput_request_done(udev, req);
867 goto out;
868 }
869
870 size = _IOC_SIZE(cmd);
871
872 /* Now check variable-length commands */
873 switch (cmd & ~IOCSIZE_MASK) {
874 case UI_GET_SYSNAME(0):
875 if (udev->state != UIST_CREATED) {
876 retval = -ENOENT;
877 goto out;
878 }
879 name = dev_name(&udev->dev->dev);
880 retval = uinput_str_to_user(p, name, size);
881 goto out;
882 }
883
884 retval = -EINVAL;
885 out:
886 mutex_unlock(&udev->mutex);
887 return retval;
888 }
889
890 static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
891 {
892 return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg);
893 }
894
895 #ifdef CONFIG_COMPAT
896 static long uinput_compat_ioctl(struct file *file,
897 unsigned int cmd, unsigned long arg)
898 {
899 return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg));
900 }
901 #endif
902
903 static const struct file_operations uinput_fops = {
904 .owner = THIS_MODULE,
905 .open = uinput_open,
906 .release = uinput_release,
907 .read = uinput_read,
908 .write = uinput_write,
909 .poll = uinput_poll,
910 .unlocked_ioctl = uinput_ioctl,
911 #ifdef CONFIG_COMPAT
912 .compat_ioctl = uinput_compat_ioctl,
913 #endif
914 .llseek = no_llseek,
915 };
916
917 static struct miscdevice uinput_misc = {
918 .fops = &uinput_fops,
919 .minor = UINPUT_MINOR,
920 .name = UINPUT_NAME,
921 };
922 MODULE_ALIAS_MISCDEV(UINPUT_MINOR);
923 MODULE_ALIAS("devname:" UINPUT_NAME);
924
925 static int __init uinput_init(void)
926 {
927 return misc_register(&uinput_misc);
928 }
929
930 static void __exit uinput_exit(void)
931 {
932 misc_deregister(&uinput_misc);
933 }
934
935 MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
936 MODULE_DESCRIPTION("User level driver support for input subsystem");
937 MODULE_LICENSE("GPL");
938 MODULE_VERSION("0.3");
939
940 module_init(uinput_init);
941 module_exit(uinput_exit);
Linux with added FPC-III support