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Merge tag 'perf-urgent-for-mingo-4.14-20170928' of git://git.kernel.org/pub/scm/linux...
[mirror_ubuntu-bionic-kernel.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 * 0.4 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_release_slot(struct uinput_device *udev,
102 unsigned int id)
103 {
104 /* Mark slot as available */
105 spin_lock(&udev->requests_lock);
106 udev->requests[id] = NULL;
107 spin_unlock(&udev->requests_lock);
108
109 wake_up(&udev->requests_waitq);
110 }
111
112 static int uinput_request_send(struct uinput_device *udev,
113 struct uinput_request *request)
114 {
115 int retval;
116
117 retval = mutex_lock_interruptible(&udev->mutex);
118 if (retval)
119 return retval;
120
121 if (udev->state != UIST_CREATED) {
122 retval = -ENODEV;
123 goto out;
124 }
125
126 init_completion(&request->done);
127
128 /*
129 * Tell our userspace application about this new request
130 * by queueing an input event.
131 */
132 uinput_dev_event(udev->dev, EV_UINPUT, request->code, request->id);
133
134 out:
135 mutex_unlock(&udev->mutex);
136 return retval;
137 }
138
139 static int uinput_request_submit(struct uinput_device *udev,
140 struct uinput_request *request)
141 {
142 int retval;
143
144 retval = uinput_request_reserve_slot(udev, request);
145 if (retval)
146 return retval;
147
148 retval = uinput_request_send(udev, request);
149 if (retval)
150 goto out;
151
152 wait_for_completion(&request->done);
153 retval = request->retval;
154
155 out:
156 uinput_request_release_slot(udev, request->id);
157 return retval;
158 }
159
160 /*
161 * Fail all outstanding requests so handlers don't wait for the userspace
162 * to finish processing them.
163 */
164 static void uinput_flush_requests(struct uinput_device *udev)
165 {
166 struct uinput_request *request;
167 int i;
168
169 spin_lock(&udev->requests_lock);
170
171 for (i = 0; i < UINPUT_NUM_REQUESTS; i++) {
172 request = udev->requests[i];
173 if (request) {
174 request->retval = -ENODEV;
175 complete(&request->done);
176 }
177 }
178
179 spin_unlock(&udev->requests_lock);
180 }
181
182 static void uinput_dev_set_gain(struct input_dev *dev, u16 gain)
183 {
184 uinput_dev_event(dev, EV_FF, FF_GAIN, gain);
185 }
186
187 static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude)
188 {
189 uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude);
190 }
191
192 static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value)
193 {
194 return uinput_dev_event(dev, EV_FF, effect_id, value);
195 }
196
197 static int uinput_dev_upload_effect(struct input_dev *dev,
198 struct ff_effect *effect,
199 struct ff_effect *old)
200 {
201 struct uinput_device *udev = input_get_drvdata(dev);
202 struct uinput_request request;
203
204 /*
205 * uinput driver does not currently support periodic effects with
206 * custom waveform since it does not have a way to pass buffer of
207 * samples (custom_data) to userspace. If ever there is a device
208 * supporting custom waveforms we would need to define an additional
209 * ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out.
210 */
211 if (effect->type == FF_PERIODIC &&
212 effect->u.periodic.waveform == FF_CUSTOM)
213 return -EINVAL;
214
215 request.code = UI_FF_UPLOAD;
216 request.u.upload.effect = effect;
217 request.u.upload.old = old;
218
219 return uinput_request_submit(udev, &request);
220 }
221
222 static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id)
223 {
224 struct uinput_device *udev = input_get_drvdata(dev);
225 struct uinput_request request;
226
227 if (!test_bit(EV_FF, dev->evbit))
228 return -ENOSYS;
229
230 request.code = UI_FF_ERASE;
231 request.u.effect_id = effect_id;
232
233 return uinput_request_submit(udev, &request);
234 }
235
236 static int uinput_dev_flush(struct input_dev *dev, struct file *file)
237 {
238 /*
239 * If we are called with file == NULL that means we are tearing
240 * down the device, and therefore we can not handle FF erase
241 * requests: either we are handling UI_DEV_DESTROY (and holding
242 * the udev->mutex), or the file descriptor is closed and there is
243 * nobody on the other side anymore.
244 */
245 return file ? input_ff_flush(dev, file) : 0;
246 }
247
248 static void uinput_destroy_device(struct uinput_device *udev)
249 {
250 const char *name, *phys;
251 struct input_dev *dev = udev->dev;
252 enum uinput_state old_state = udev->state;
253
254 udev->state = UIST_NEW_DEVICE;
255
256 if (dev) {
257 name = dev->name;
258 phys = dev->phys;
259 if (old_state == UIST_CREATED) {
260 uinput_flush_requests(udev);
261 input_unregister_device(dev);
262 } else {
263 input_free_device(dev);
264 }
265 kfree(name);
266 kfree(phys);
267 udev->dev = NULL;
268 }
269 }
270
271 static int uinput_create_device(struct uinput_device *udev)
272 {
273 struct input_dev *dev = udev->dev;
274 int error, nslot;
275
276 if (udev->state != UIST_SETUP_COMPLETE) {
277 printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
278 return -EINVAL;
279 }
280
281 if (test_bit(EV_ABS, dev->evbit)) {
282 input_alloc_absinfo(dev);
283 if (!dev->absinfo) {
284 error = -EINVAL;
285 goto fail1;
286 }
287
288 if (test_bit(ABS_MT_SLOT, dev->absbit)) {
289 nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1;
290 error = input_mt_init_slots(dev, nslot, 0);
291 if (error)
292 goto fail1;
293 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
294 input_set_events_per_packet(dev, 60);
295 }
296 }
297
298 if (test_bit(EV_FF, dev->evbit) && !udev->ff_effects_max) {
299 printk(KERN_DEBUG "%s: ff_effects_max should be non-zero when FF_BIT is set\n",
300 UINPUT_NAME);
301 error = -EINVAL;
302 goto fail1;
303 }
304
305 if (udev->ff_effects_max) {
306 error = input_ff_create(dev, udev->ff_effects_max);
307 if (error)
308 goto fail1;
309
310 dev->ff->upload = uinput_dev_upload_effect;
311 dev->ff->erase = uinput_dev_erase_effect;
312 dev->ff->playback = uinput_dev_playback;
313 dev->ff->set_gain = uinput_dev_set_gain;
314 dev->ff->set_autocenter = uinput_dev_set_autocenter;
315 /*
316 * The standard input_ff_flush() implementation does
317 * not quite work for uinput as we can't reasonably
318 * handle FF requests during device teardown.
319 */
320 dev->flush = uinput_dev_flush;
321 }
322
323 error = input_register_device(udev->dev);
324 if (error)
325 goto fail2;
326
327 udev->state = UIST_CREATED;
328
329 return 0;
330
331 fail2: input_ff_destroy(dev);
332 fail1: uinput_destroy_device(udev);
333 return error;
334 }
335
336 static int uinput_open(struct inode *inode, struct file *file)
337 {
338 struct uinput_device *newdev;
339
340 newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL);
341 if (!newdev)
342 return -ENOMEM;
343
344 mutex_init(&newdev->mutex);
345 spin_lock_init(&newdev->requests_lock);
346 init_waitqueue_head(&newdev->requests_waitq);
347 init_waitqueue_head(&newdev->waitq);
348 newdev->state = UIST_NEW_DEVICE;
349
350 file->private_data = newdev;
351 nonseekable_open(inode, file);
352
353 return 0;
354 }
355
356 static int uinput_validate_absinfo(struct input_dev *dev, unsigned int code,
357 const struct input_absinfo *abs)
358 {
359 int min, max;
360
361 min = abs->minimum;
362 max = abs->maximum;
363
364 if ((min != 0 || max != 0) && max <= min) {
365 printk(KERN_DEBUG
366 "%s: invalid abs[%02x] min:%d max:%d\n",
367 UINPUT_NAME, code, min, max);
368 return -EINVAL;
369 }
370
371 if (abs->flat > max - min) {
372 printk(KERN_DEBUG
373 "%s: abs_flat #%02x out of range: %d (min:%d/max:%d)\n",
374 UINPUT_NAME, code, abs->flat, min, max);
375 return -EINVAL;
376 }
377
378 return 0;
379 }
380
381 static int uinput_validate_absbits(struct input_dev *dev)
382 {
383 unsigned int cnt;
384 int error;
385
386 if (!test_bit(EV_ABS, dev->evbit))
387 return 0;
388
389 /*
390 * Check if absmin/absmax/absfuzz/absflat are sane.
391 */
392
393 for_each_set_bit(cnt, dev->absbit, ABS_CNT) {
394 if (!dev->absinfo)
395 return -EINVAL;
396
397 error = uinput_validate_absinfo(dev, cnt, &dev->absinfo[cnt]);
398 if (error)
399 return error;
400 }
401
402 return 0;
403 }
404
405 static int uinput_allocate_device(struct uinput_device *udev)
406 {
407 udev->dev = input_allocate_device();
408 if (!udev->dev)
409 return -ENOMEM;
410
411 udev->dev->event = uinput_dev_event;
412 input_set_drvdata(udev->dev, udev);
413
414 return 0;
415 }
416
417 static int uinput_dev_setup(struct uinput_device *udev,
418 struct uinput_setup __user *arg)
419 {
420 struct uinput_setup setup;
421 struct input_dev *dev;
422
423 if (udev->state == UIST_CREATED)
424 return -EINVAL;
425
426 if (copy_from_user(&setup, arg, sizeof(setup)))
427 return -EFAULT;
428
429 if (!setup.name[0])
430 return -EINVAL;
431
432 dev = udev->dev;
433 dev->id = setup.id;
434 udev->ff_effects_max = setup.ff_effects_max;
435
436 kfree(dev->name);
437 dev->name = kstrndup(setup.name, UINPUT_MAX_NAME_SIZE, GFP_KERNEL);
438 if (!dev->name)
439 return -ENOMEM;
440
441 udev->state = UIST_SETUP_COMPLETE;
442 return 0;
443 }
444
445 static int uinput_abs_setup(struct uinput_device *udev,
446 struct uinput_setup __user *arg, size_t size)
447 {
448 struct uinput_abs_setup setup = {};
449 struct input_dev *dev;
450 int error;
451
452 if (size > sizeof(setup))
453 return -E2BIG;
454
455 if (udev->state == UIST_CREATED)
456 return -EINVAL;
457
458 if (copy_from_user(&setup, arg, size))
459 return -EFAULT;
460
461 if (setup.code > ABS_MAX)
462 return -ERANGE;
463
464 dev = udev->dev;
465
466 error = uinput_validate_absinfo(dev, setup.code, &setup.absinfo);
467 if (error)
468 return error;
469
470 input_alloc_absinfo(dev);
471 if (!dev->absinfo)
472 return -ENOMEM;
473
474 set_bit(setup.code, dev->absbit);
475 dev->absinfo[setup.code] = setup.absinfo;
476 return 0;
477 }
478
479 /* legacy setup via write() */
480 static int uinput_setup_device_legacy(struct uinput_device *udev,
481 const char __user *buffer, size_t count)
482 {
483 struct uinput_user_dev *user_dev;
484 struct input_dev *dev;
485 int i;
486 int retval;
487
488 if (count != sizeof(struct uinput_user_dev))
489 return -EINVAL;
490
491 if (!udev->dev) {
492 retval = uinput_allocate_device(udev);
493 if (retval)
494 return retval;
495 }
496
497 dev = udev->dev;
498
499 user_dev = memdup_user(buffer, sizeof(struct uinput_user_dev));
500 if (IS_ERR(user_dev))
501 return PTR_ERR(user_dev);
502
503 udev->ff_effects_max = user_dev->ff_effects_max;
504
505 /* Ensure name is filled in */
506 if (!user_dev->name[0]) {
507 retval = -EINVAL;
508 goto exit;
509 }
510
511 kfree(dev->name);
512 dev->name = kstrndup(user_dev->name, UINPUT_MAX_NAME_SIZE,
513 GFP_KERNEL);
514 if (!dev->name) {
515 retval = -ENOMEM;
516 goto exit;
517 }
518
519 dev->id.bustype = user_dev->id.bustype;
520 dev->id.vendor = user_dev->id.vendor;
521 dev->id.product = user_dev->id.product;
522 dev->id.version = user_dev->id.version;
523
524 for (i = 0; i < ABS_CNT; i++) {
525 input_abs_set_max(dev, i, user_dev->absmax[i]);
526 input_abs_set_min(dev, i, user_dev->absmin[i]);
527 input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]);
528 input_abs_set_flat(dev, i, user_dev->absflat[i]);
529 }
530
531 retval = uinput_validate_absbits(dev);
532 if (retval < 0)
533 goto exit;
534
535 udev->state = UIST_SETUP_COMPLETE;
536 retval = count;
537
538 exit:
539 kfree(user_dev);
540 return retval;
541 }
542
543 static ssize_t uinput_inject_events(struct uinput_device *udev,
544 const char __user *buffer, size_t count)
545 {
546 struct input_event ev;
547 size_t bytes = 0;
548
549 if (count != 0 && count < input_event_size())
550 return -EINVAL;
551
552 while (bytes + input_event_size() <= count) {
553 /*
554 * Note that even if some events were fetched successfully
555 * we are still going to return EFAULT instead of partial
556 * count to let userspace know that it got it's buffers
557 * all wrong.
558 */
559 if (input_event_from_user(buffer + bytes, &ev))
560 return -EFAULT;
561
562 input_event(udev->dev, ev.type, ev.code, ev.value);
563 bytes += input_event_size();
564 }
565
566 return bytes;
567 }
568
569 static ssize_t uinput_write(struct file *file, const char __user *buffer,
570 size_t count, loff_t *ppos)
571 {
572 struct uinput_device *udev = file->private_data;
573 int retval;
574
575 if (count == 0)
576 return 0;
577
578 retval = mutex_lock_interruptible(&udev->mutex);
579 if (retval)
580 return retval;
581
582 retval = udev->state == UIST_CREATED ?
583 uinput_inject_events(udev, buffer, count) :
584 uinput_setup_device_legacy(udev, buffer, count);
585
586 mutex_unlock(&udev->mutex);
587
588 return retval;
589 }
590
591 static bool uinput_fetch_next_event(struct uinput_device *udev,
592 struct input_event *event)
593 {
594 bool have_event;
595
596 spin_lock_irq(&udev->dev->event_lock);
597
598 have_event = udev->head != udev->tail;
599 if (have_event) {
600 *event = udev->buff[udev->tail];
601 udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
602 }
603
604 spin_unlock_irq(&udev->dev->event_lock);
605
606 return have_event;
607 }
608
609 static ssize_t uinput_events_to_user(struct uinput_device *udev,
610 char __user *buffer, size_t count)
611 {
612 struct input_event event;
613 size_t read = 0;
614
615 while (read + input_event_size() <= count &&
616 uinput_fetch_next_event(udev, &event)) {
617
618 if (input_event_to_user(buffer + read, &event))
619 return -EFAULT;
620
621 read += input_event_size();
622 }
623
624 return read;
625 }
626
627 static ssize_t uinput_read(struct file *file, char __user *buffer,
628 size_t count, loff_t *ppos)
629 {
630 struct uinput_device *udev = file->private_data;
631 ssize_t retval;
632
633 if (count != 0 && count < input_event_size())
634 return -EINVAL;
635
636 do {
637 retval = mutex_lock_interruptible(&udev->mutex);
638 if (retval)
639 return retval;
640
641 if (udev->state != UIST_CREATED)
642 retval = -ENODEV;
643 else if (udev->head == udev->tail &&
644 (file->f_flags & O_NONBLOCK))
645 retval = -EAGAIN;
646 else
647 retval = uinput_events_to_user(udev, buffer, count);
648
649 mutex_unlock(&udev->mutex);
650
651 if (retval || count == 0)
652 break;
653
654 if (!(file->f_flags & O_NONBLOCK))
655 retval = wait_event_interruptible(udev->waitq,
656 udev->head != udev->tail ||
657 udev->state != UIST_CREATED);
658 } while (retval == 0);
659
660 return retval;
661 }
662
663 static unsigned int uinput_poll(struct file *file, poll_table *wait)
664 {
665 struct uinput_device *udev = file->private_data;
666
667 poll_wait(file, &udev->waitq, wait);
668
669 if (udev->head != udev->tail)
670 return POLLIN | POLLRDNORM;
671
672 return 0;
673 }
674
675 static int uinput_release(struct inode *inode, struct file *file)
676 {
677 struct uinput_device *udev = file->private_data;
678
679 uinput_destroy_device(udev);
680 kfree(udev);
681
682 return 0;
683 }
684
685 #ifdef CONFIG_COMPAT
686 struct uinput_ff_upload_compat {
687 __u32 request_id;
688 __s32 retval;
689 struct ff_effect_compat effect;
690 struct ff_effect_compat old;
691 };
692
693 static int uinput_ff_upload_to_user(char __user *buffer,
694 const struct uinput_ff_upload *ff_up)
695 {
696 if (in_compat_syscall()) {
697 struct uinput_ff_upload_compat ff_up_compat;
698
699 ff_up_compat.request_id = ff_up->request_id;
700 ff_up_compat.retval = ff_up->retval;
701 /*
702 * It so happens that the pointer that gives us the trouble
703 * is the last field in the structure. Since we don't support
704 * custom waveforms in uinput anyway we can just copy the whole
705 * thing (to the compat size) and ignore the pointer.
706 */
707 memcpy(&ff_up_compat.effect, &ff_up->effect,
708 sizeof(struct ff_effect_compat));
709 memcpy(&ff_up_compat.old, &ff_up->old,
710 sizeof(struct ff_effect_compat));
711
712 if (copy_to_user(buffer, &ff_up_compat,
713 sizeof(struct uinput_ff_upload_compat)))
714 return -EFAULT;
715 } else {
716 if (copy_to_user(buffer, ff_up,
717 sizeof(struct uinput_ff_upload)))
718 return -EFAULT;
719 }
720
721 return 0;
722 }
723
724 static int uinput_ff_upload_from_user(const char __user *buffer,
725 struct uinput_ff_upload *ff_up)
726 {
727 if (in_compat_syscall()) {
728 struct uinput_ff_upload_compat ff_up_compat;
729
730 if (copy_from_user(&ff_up_compat, buffer,
731 sizeof(struct uinput_ff_upload_compat)))
732 return -EFAULT;
733
734 ff_up->request_id = ff_up_compat.request_id;
735 ff_up->retval = ff_up_compat.retval;
736 memcpy(&ff_up->effect, &ff_up_compat.effect,
737 sizeof(struct ff_effect_compat));
738 memcpy(&ff_up->old, &ff_up_compat.old,
739 sizeof(struct ff_effect_compat));
740
741 } else {
742 if (copy_from_user(ff_up, buffer,
743 sizeof(struct uinput_ff_upload)))
744 return -EFAULT;
745 }
746
747 return 0;
748 }
749
750 #else
751
752 static int uinput_ff_upload_to_user(char __user *buffer,
753 const struct uinput_ff_upload *ff_up)
754 {
755 if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload)))
756 return -EFAULT;
757
758 return 0;
759 }
760
761 static int uinput_ff_upload_from_user(const char __user *buffer,
762 struct uinput_ff_upload *ff_up)
763 {
764 if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload)))
765 return -EFAULT;
766
767 return 0;
768 }
769
770 #endif
771
772 #define uinput_set_bit(_arg, _bit, _max) \
773 ({ \
774 int __ret = 0; \
775 if (udev->state == UIST_CREATED) \
776 __ret = -EINVAL; \
777 else if ((_arg) > (_max)) \
778 __ret = -EINVAL; \
779 else set_bit((_arg), udev->dev->_bit); \
780 __ret; \
781 })
782
783 static int uinput_str_to_user(void __user *dest, const char *str,
784 unsigned int maxlen)
785 {
786 char __user *p = dest;
787 int len, ret;
788
789 if (!str)
790 return -ENOENT;
791
792 if (maxlen == 0)
793 return -EINVAL;
794
795 len = strlen(str) + 1;
796 if (len > maxlen)
797 len = maxlen;
798
799 ret = copy_to_user(p, str, len);
800 if (ret)
801 return -EFAULT;
802
803 /* force terminating '\0' */
804 ret = put_user(0, p + len - 1);
805 return ret ? -EFAULT : len;
806 }
807
808 static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
809 unsigned long arg, void __user *p)
810 {
811 int retval;
812 struct uinput_device *udev = file->private_data;
813 struct uinput_ff_upload ff_up;
814 struct uinput_ff_erase ff_erase;
815 struct uinput_request *req;
816 char *phys;
817 const char *name;
818 unsigned int size;
819
820 retval = mutex_lock_interruptible(&udev->mutex);
821 if (retval)
822 return retval;
823
824 if (!udev->dev) {
825 retval = uinput_allocate_device(udev);
826 if (retval)
827 goto out;
828 }
829
830 switch (cmd) {
831 case UI_GET_VERSION:
832 if (put_user(UINPUT_VERSION,
833 (unsigned int __user *)p))
834 retval = -EFAULT;
835 goto out;
836
837 case UI_DEV_CREATE:
838 retval = uinput_create_device(udev);
839 goto out;
840
841 case UI_DEV_DESTROY:
842 uinput_destroy_device(udev);
843 goto out;
844
845 case UI_DEV_SETUP:
846 retval = uinput_dev_setup(udev, p);
847 goto out;
848
849 /* UI_ABS_SETUP is handled in the variable size ioctls */
850
851 case UI_SET_EVBIT:
852 retval = uinput_set_bit(arg, evbit, EV_MAX);
853 goto out;
854
855 case UI_SET_KEYBIT:
856 retval = uinput_set_bit(arg, keybit, KEY_MAX);
857 goto out;
858
859 case UI_SET_RELBIT:
860 retval = uinput_set_bit(arg, relbit, REL_MAX);
861 goto out;
862
863 case UI_SET_ABSBIT:
864 retval = uinput_set_bit(arg, absbit, ABS_MAX);
865 goto out;
866
867 case UI_SET_MSCBIT:
868 retval = uinput_set_bit(arg, mscbit, MSC_MAX);
869 goto out;
870
871 case UI_SET_LEDBIT:
872 retval = uinput_set_bit(arg, ledbit, LED_MAX);
873 goto out;
874
875 case UI_SET_SNDBIT:
876 retval = uinput_set_bit(arg, sndbit, SND_MAX);
877 goto out;
878
879 case UI_SET_FFBIT:
880 retval = uinput_set_bit(arg, ffbit, FF_MAX);
881 goto out;
882
883 case UI_SET_SWBIT:
884 retval = uinput_set_bit(arg, swbit, SW_MAX);
885 goto out;
886
887 case UI_SET_PROPBIT:
888 retval = uinput_set_bit(arg, propbit, INPUT_PROP_MAX);
889 goto out;
890
891 case UI_SET_PHYS:
892 if (udev->state == UIST_CREATED) {
893 retval = -EINVAL;
894 goto out;
895 }
896
897 phys = strndup_user(p, 1024);
898 if (IS_ERR(phys)) {
899 retval = PTR_ERR(phys);
900 goto out;
901 }
902
903 kfree(udev->dev->phys);
904 udev->dev->phys = phys;
905 goto out;
906
907 case UI_BEGIN_FF_UPLOAD:
908 retval = uinput_ff_upload_from_user(p, &ff_up);
909 if (retval)
910 goto out;
911
912 req = uinput_request_find(udev, ff_up.request_id);
913 if (!req || req->code != UI_FF_UPLOAD ||
914 !req->u.upload.effect) {
915 retval = -EINVAL;
916 goto out;
917 }
918
919 ff_up.retval = 0;
920 ff_up.effect = *req->u.upload.effect;
921 if (req->u.upload.old)
922 ff_up.old = *req->u.upload.old;
923 else
924 memset(&ff_up.old, 0, sizeof(struct ff_effect));
925
926 retval = uinput_ff_upload_to_user(p, &ff_up);
927 goto out;
928
929 case UI_BEGIN_FF_ERASE:
930 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
931 retval = -EFAULT;
932 goto out;
933 }
934
935 req = uinput_request_find(udev, ff_erase.request_id);
936 if (!req || req->code != UI_FF_ERASE) {
937 retval = -EINVAL;
938 goto out;
939 }
940
941 ff_erase.retval = 0;
942 ff_erase.effect_id = req->u.effect_id;
943 if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
944 retval = -EFAULT;
945 goto out;
946 }
947
948 goto out;
949
950 case UI_END_FF_UPLOAD:
951 retval = uinput_ff_upload_from_user(p, &ff_up);
952 if (retval)
953 goto out;
954
955 req = uinput_request_find(udev, ff_up.request_id);
956 if (!req || req->code != UI_FF_UPLOAD ||
957 !req->u.upload.effect) {
958 retval = -EINVAL;
959 goto out;
960 }
961
962 req->retval = ff_up.retval;
963 complete(&req->done);
964 goto out;
965
966 case UI_END_FF_ERASE:
967 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
968 retval = -EFAULT;
969 goto out;
970 }
971
972 req = uinput_request_find(udev, ff_erase.request_id);
973 if (!req || req->code != UI_FF_ERASE) {
974 retval = -EINVAL;
975 goto out;
976 }
977
978 req->retval = ff_erase.retval;
979 complete(&req->done);
980 goto out;
981 }
982
983 size = _IOC_SIZE(cmd);
984
985 /* Now check variable-length commands */
986 switch (cmd & ~IOCSIZE_MASK) {
987 case UI_GET_SYSNAME(0):
988 if (udev->state != UIST_CREATED) {
989 retval = -ENOENT;
990 goto out;
991 }
992 name = dev_name(&udev->dev->dev);
993 retval = uinput_str_to_user(p, name, size);
994 goto out;
995
996 case UI_ABS_SETUP & ~IOCSIZE_MASK:
997 retval = uinput_abs_setup(udev, p, size);
998 goto out;
999 }
1000
1001 retval = -EINVAL;
1002 out:
1003 mutex_unlock(&udev->mutex);
1004 return retval;
1005 }
1006
1007 static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1008 {
1009 return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg);
1010 }
1011
1012 #ifdef CONFIG_COMPAT
1013
1014 #define UI_SET_PHYS_COMPAT _IOW(UINPUT_IOCTL_BASE, 108, compat_uptr_t)
1015
1016 static long uinput_compat_ioctl(struct file *file,
1017 unsigned int cmd, unsigned long arg)
1018 {
1019 if (cmd == UI_SET_PHYS_COMPAT)
1020 cmd = UI_SET_PHYS;
1021
1022 return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg));
1023 }
1024 #endif
1025
1026 static const struct file_operations uinput_fops = {
1027 .owner = THIS_MODULE,
1028 .open = uinput_open,
1029 .release = uinput_release,
1030 .read = uinput_read,
1031 .write = uinput_write,
1032 .poll = uinput_poll,
1033 .unlocked_ioctl = uinput_ioctl,
1034 #ifdef CONFIG_COMPAT
1035 .compat_ioctl = uinput_compat_ioctl,
1036 #endif
1037 .llseek = no_llseek,
1038 };
1039
1040 static struct miscdevice uinput_misc = {
1041 .fops = &uinput_fops,
1042 .minor = UINPUT_MINOR,
1043 .name = UINPUT_NAME,
1044 };
1045 module_misc_device(uinput_misc);
1046
1047 MODULE_ALIAS_MISCDEV(UINPUT_MINOR);
1048 MODULE_ALIAS("devname:" UINPUT_NAME);
1049
1050 MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
1051 MODULE_DESCRIPTION("User level driver support for input subsystem");
1052 MODULE_LICENSE("GPL");
1053 MODULE_VERSION("0.3");
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