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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
43static int uinput_dev_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
44{
45 struct uinput_device *udev = input_get_drvdata(dev);
46
47 udev->buff[udev->head].type = type;
48 udev->buff[udev->head].code = code;
49 udev->buff[udev->head].value = value;
50 do_gettimeofday(&udev->buff[udev->head].time);
51 udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE;
52
53 wake_up_interruptible(&udev->waitq);
54
55 return 0;
56}
57
58/* Atomically allocate an ID for the given request. Returns 0 on success. */
59static int uinput_request_alloc_id(struct uinput_device *udev, struct uinput_request *request)
60{
61 int id;
62 int err = -1;
63
64 spin_lock(&udev->requests_lock);
65
66 for (id = 0; id < UINPUT_NUM_REQUESTS; id++) {
67 if (!udev->requests[id]) {
68 request->id = id;
69 udev->requests[id] = request;
70 err = 0;
71 break;
72 }
73 }
74
75 spin_unlock(&udev->requests_lock);
76 return err;
77}
78
79static struct uinput_request *uinput_request_find(struct uinput_device *udev, int id)
80{
81 /* Find an input request, by ID. Returns NULL if the ID isn't valid. */
82 if (id >= UINPUT_NUM_REQUESTS || id < 0)
83 return NULL;
84
85 return udev->requests[id];
86}
87
88static inline int uinput_request_reserve_slot(struct uinput_device *udev, struct uinput_request *request)
89{
90 /* Allocate slot. If none are available right away, wait. */
91 return wait_event_interruptible(udev->requests_waitq,
92 !uinput_request_alloc_id(udev, request));
93}
94
95static void uinput_request_done(struct uinput_device *udev, struct uinput_request *request)
96{
97 /* Mark slot as available */
98 udev->requests[request->id] = NULL;
99 wake_up(&udev->requests_waitq);
100
101 complete(&request->done);
102}
103
104static int uinput_request_submit(struct uinput_device *udev, struct uinput_request *request)
105{
106 int retval;
107
108 retval = uinput_request_reserve_slot(udev, request);
109 if (retval)
110 return retval;
111
112 retval = mutex_lock_interruptible(&udev->mutex);
113 if (retval)
114 return retval;
115
116 if (udev->state != UIST_CREATED) {
117 retval = -ENODEV;
118 goto out;
119 }
120
121 /* Tell our userspace app about this new request by queueing an input event */
122 uinput_dev_event(udev->dev, EV_UINPUT, request->code, request->id);
123
124 out:
125 mutex_unlock(&udev->mutex);
126 return retval;
127}
128
129/*
130 * Fail all ouitstanding requests so handlers don't wait for the userspace
131 * to finish processing them.
132 */
133static void uinput_flush_requests(struct uinput_device *udev)
134{
135 struct uinput_request *request;
136 int i;
137
138 spin_lock(&udev->requests_lock);
139
140 for (i = 0; i < UINPUT_NUM_REQUESTS; i++) {
141 request = udev->requests[i];
142 if (request) {
143 request->retval = -ENODEV;
144 uinput_request_done(udev, request);
145 }
146 }
147
148 spin_unlock(&udev->requests_lock);
149}
150
151static void uinput_dev_set_gain(struct input_dev *dev, u16 gain)
152{
153 uinput_dev_event(dev, EV_FF, FF_GAIN, gain);
154}
155
156static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude)
157{
158 uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude);
159}
160
161static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value)
162{
163 return uinput_dev_event(dev, EV_FF, effect_id, value);
164}
165
166static int uinput_dev_upload_effect(struct input_dev *dev, struct ff_effect *effect, struct ff_effect *old)
167{
168 struct uinput_device *udev = input_get_drvdata(dev);
169 struct uinput_request request;
170 int retval;
171
172 /*
173 * uinput driver does not currently support periodic effects with
174 * custom waveform since it does not have a way to pass buffer of
175 * samples (custom_data) to userspace. If ever there is a device
176 * supporting custom waveforms we would need to define an additional
177 * ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out.
178 */
179 if (effect->type == FF_PERIODIC &&
180 effect->u.periodic.waveform == FF_CUSTOM)
181 return -EINVAL;
182
183 request.id = -1;
184 init_completion(&request.done);
185 request.code = UI_FF_UPLOAD;
186 request.u.upload.effect = effect;
187 request.u.upload.old = old;
188
189 retval = uinput_request_submit(udev, &request);
190 if (!retval) {
191 wait_for_completion(&request.done);
192 retval = request.retval;
193 }
194
195 return retval;
196}
197
198static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id)
199{
200 struct uinput_device *udev = input_get_drvdata(dev);
201 struct uinput_request request;
202 int retval;
203
204 if (!test_bit(EV_FF, dev->evbit))
205 return -ENOSYS;
206
207 request.id = -1;
208 init_completion(&request.done);
209 request.code = UI_FF_ERASE;
210 request.u.effect_id = effect_id;
211
212 retval = uinput_request_submit(udev, &request);
213 if (!retval) {
214 wait_for_completion(&request.done);
215 retval = request.retval;
216 }
217
218 return retval;
219}
220
221static void uinput_destroy_device(struct uinput_device *udev)
222{
223 const char *name, *phys;
224 struct input_dev *dev = udev->dev;
225 enum uinput_state old_state = udev->state;
226
227 udev->state = UIST_NEW_DEVICE;
228
229 if (dev) {
230 name = dev->name;
231 phys = dev->phys;
232 if (old_state == UIST_CREATED) {
233 uinput_flush_requests(udev);
234 input_unregister_device(dev);
235 } else {
236 input_free_device(dev);
237 }
238 kfree(name);
239 kfree(phys);
240 udev->dev = NULL;
241 }
242}
243
244static int uinput_create_device(struct uinput_device *udev)
245{
246 struct input_dev *dev = udev->dev;
247 int error;
248
249 if (udev->state != UIST_SETUP_COMPLETE) {
250 printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
251 return -EINVAL;
252 }
253
254 if (udev->ff_effects_max) {
255 error = input_ff_create(dev, udev->ff_effects_max);
256 if (error)
257 goto fail1;
258
259 dev->ff->upload = uinput_dev_upload_effect;
260 dev->ff->erase = uinput_dev_erase_effect;
261 dev->ff->playback = uinput_dev_playback;
262 dev->ff->set_gain = uinput_dev_set_gain;
263 dev->ff->set_autocenter = uinput_dev_set_autocenter;
264 }
265
266 error = input_register_device(udev->dev);
267 if (error)
268 goto fail2;
269
270 udev->state = UIST_CREATED;
271
272 return 0;
273
274 fail2: input_ff_destroy(dev);
275 fail1: uinput_destroy_device(udev);
276 return error;
277}
278
279static int uinput_open(struct inode *inode, struct file *file)
280{
281 struct uinput_device *newdev;
282
283 newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL);
284 if (!newdev)
285 return -ENOMEM;
286
287 mutex_init(&newdev->mutex);
288 spin_lock_init(&newdev->requests_lock);
289 init_waitqueue_head(&newdev->requests_waitq);
290 init_waitqueue_head(&newdev->waitq);
291 newdev->state = UIST_NEW_DEVICE;
292
293 file->private_data = newdev;
294 nonseekable_open(inode, file);
295
296 return 0;
297}
298
299static int uinput_validate_absbits(struct input_dev *dev)
300{
301 unsigned int cnt;
302 int retval = 0;
303
304 for (cnt = 0; cnt < ABS_CNT; cnt++) {
305 int min, max;
306 if (!test_bit(cnt, dev->absbit))
307 continue;
308
309 min = input_abs_get_min(dev, cnt);
310 max = input_abs_get_max(dev, cnt);
311
312 if ((min != 0 || max != 0) && max <= min) {
313 printk(KERN_DEBUG
314 "%s: invalid abs[%02x] min:%d max:%d\n",
315 UINPUT_NAME, cnt,
316 input_abs_get_min(dev, cnt),
317 input_abs_get_max(dev, cnt));
318 retval = -EINVAL;
319 break;
320 }
321
322 if (input_abs_get_flat(dev, cnt) >
323 input_abs_get_max(dev, cnt) - input_abs_get_min(dev, cnt)) {
324 printk(KERN_DEBUG
325 "%s: abs_flat #%02x out of range: %d "
326 "(min:%d/max:%d)\n",
327 UINPUT_NAME, cnt,
328 input_abs_get_flat(dev, cnt),
329 input_abs_get_min(dev, cnt),
330 input_abs_get_max(dev, cnt));
331 retval = -EINVAL;
332 break;
333 }
334 }
335 return retval;
336}
337
338static int uinput_allocate_device(struct uinput_device *udev)
339{
340 udev->dev = input_allocate_device();
341 if (!udev->dev)
342 return -ENOMEM;
343
344 udev->dev->event = uinput_dev_event;
345 input_set_drvdata(udev->dev, udev);
346
347 return 0;
348}
349
350static int uinput_setup_device(struct uinput_device *udev, const char __user *buffer, size_t count)
351{
352 struct uinput_user_dev *user_dev;
353 struct input_dev *dev;
354 int i;
355 int retval;
356
357 if (count != sizeof(struct uinput_user_dev))
358 return -EINVAL;
359
360 if (!udev->dev) {
361 retval = uinput_allocate_device(udev);
362 if (retval)
363 return retval;
364 }
365
366 dev = udev->dev;
367
368 user_dev = memdup_user(buffer, sizeof(struct uinput_user_dev));
369 if (IS_ERR(user_dev))
370 return PTR_ERR(user_dev);
371
372 udev->ff_effects_max = user_dev->ff_effects_max;
373
374 /* Ensure name is filled in */
375 if (!user_dev->name[0]) {
376 retval = -EINVAL;
377 goto exit;
378 }
379
380 kfree(dev->name);
381 dev->name = kstrndup(user_dev->name, UINPUT_MAX_NAME_SIZE,
382 GFP_KERNEL);
383 if (!dev->name) {
384 retval = -ENOMEM;
385 goto exit;
386 }
387
388 dev->id.bustype = user_dev->id.bustype;
389 dev->id.vendor = user_dev->id.vendor;
390 dev->id.product = user_dev->id.product;
391 dev->id.version = user_dev->id.version;
392
393 for (i = 0; i < ABS_CNT; i++) {
394 input_abs_set_max(dev, i, user_dev->absmax[i]);
395 input_abs_set_min(dev, i, user_dev->absmin[i]);
396 input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]);
397 input_abs_set_flat(dev, i, user_dev->absflat[i]);
398 }
399
400 /* check if absmin/absmax/absfuzz/absflat are filled as
401 * told in Documentation/input/input-programming.txt */
402 if (test_bit(EV_ABS, dev->evbit)) {
403 retval = uinput_validate_absbits(dev);
404 if (retval < 0)
405 goto exit;
406 if (test_bit(ABS_MT_SLOT, dev->absbit)) {
407 int nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1;
408 input_mt_init_slots(dev, nslot);
409 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
410 input_set_events_per_packet(dev, 60);
411 }
412 }
413
414 udev->state = UIST_SETUP_COMPLETE;
415 retval = count;
416
417 exit:
418 kfree(user_dev);
419 return retval;
420}
421
422static inline ssize_t uinput_inject_event(struct uinput_device *udev, const char __user *buffer, size_t count)
423{
424 struct input_event ev;
425
426 if (count < input_event_size())
427 return -EINVAL;
428
429 if (input_event_from_user(buffer, &ev))
430 return -EFAULT;
431
432 input_event(udev->dev, ev.type, ev.code, ev.value);
433
434 return input_event_size();
435}
436
437static ssize_t uinput_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
438{
439 struct uinput_device *udev = file->private_data;
440 int retval;
441
442 retval = mutex_lock_interruptible(&udev->mutex);
443 if (retval)
444 return retval;
445
446 retval = udev->state == UIST_CREATED ?
447 uinput_inject_event(udev, buffer, count) :
448 uinput_setup_device(udev, buffer, count);
449
450 mutex_unlock(&udev->mutex);
451
452 return retval;
453}
454
455static ssize_t uinput_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
456{
457 struct uinput_device *udev = file->private_data;
458 int retval = 0;
459
460 if (udev->state != UIST_CREATED)
461 return -ENODEV;
462
463 if (udev->head == udev->tail && (file->f_flags & O_NONBLOCK))
464 return -EAGAIN;
465
466 retval = wait_event_interruptible(udev->waitq,
467 udev->head != udev->tail || udev->state != UIST_CREATED);
468 if (retval)
469 return retval;
470
471 retval = mutex_lock_interruptible(&udev->mutex);
472 if (retval)
473 return retval;
474
475 if (udev->state != UIST_CREATED) {
476 retval = -ENODEV;
477 goto out;
478 }
479
480 while (udev->head != udev->tail && retval + input_event_size() <= count) {
481 if (input_event_to_user(buffer + retval, &udev->buff[udev->tail])) {
482 retval = -EFAULT;
483 goto out;
484 }
485 udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
486 retval += input_event_size();
487 }
488
489 out:
490 mutex_unlock(&udev->mutex);
491
492 return retval;
493}
494
495static unsigned int uinput_poll(struct file *file, poll_table *wait)
496{
497 struct uinput_device *udev = file->private_data;
498
499 poll_wait(file, &udev->waitq, wait);
500
501 if (udev->head != udev->tail)
502 return POLLIN | POLLRDNORM;
503
504 return 0;
505}
506
507static int uinput_release(struct inode *inode, struct file *file)
508{
509 struct uinput_device *udev = file->private_data;
510
511 uinput_destroy_device(udev);
512 kfree(udev);
513
514 return 0;
515}
516
517#ifdef CONFIG_COMPAT
518struct uinput_ff_upload_compat {
519 int request_id;
520 int retval;
521 struct ff_effect_compat effect;
522 struct ff_effect_compat old;
523};
524
525static int uinput_ff_upload_to_user(char __user *buffer,
526 const struct uinput_ff_upload *ff_up)
527{
528 if (INPUT_COMPAT_TEST) {
529 struct uinput_ff_upload_compat ff_up_compat;
530
531 ff_up_compat.request_id = ff_up->request_id;
532 ff_up_compat.retval = ff_up->retval;
533 /*
534 * It so happens that the pointer that gives us the trouble
535 * is the last field in the structure. Since we don't support
536 * custom waveforms in uinput anyway we can just copy the whole
537 * thing (to the compat size) and ignore the pointer.
538 */
539 memcpy(&ff_up_compat.effect, &ff_up->effect,
540 sizeof(struct ff_effect_compat));
541 memcpy(&ff_up_compat.old, &ff_up->old,
542 sizeof(struct ff_effect_compat));
543
544 if (copy_to_user(buffer, &ff_up_compat,
545 sizeof(struct uinput_ff_upload_compat)))
546 return -EFAULT;
547 } else {
548 if (copy_to_user(buffer, ff_up,
549 sizeof(struct uinput_ff_upload)))
550 return -EFAULT;
551 }
552
553 return 0;
554}
555
556static int uinput_ff_upload_from_user(const char __user *buffer,
557 struct uinput_ff_upload *ff_up)
558{
559 if (INPUT_COMPAT_TEST) {
560 struct uinput_ff_upload_compat ff_up_compat;
561
562 if (copy_from_user(&ff_up_compat, buffer,
563 sizeof(struct uinput_ff_upload_compat)))
564 return -EFAULT;
565
566 ff_up->request_id = ff_up_compat.request_id;
567 ff_up->retval = ff_up_compat.retval;
568 memcpy(&ff_up->effect, &ff_up_compat.effect,
569 sizeof(struct ff_effect_compat));
570 memcpy(&ff_up->old, &ff_up_compat.old,
571 sizeof(struct ff_effect_compat));
572
573 } else {
574 if (copy_from_user(ff_up, buffer,
575 sizeof(struct uinput_ff_upload)))
576 return -EFAULT;
577 }
578
579 return 0;
580}
581
582#else
583
584static int uinput_ff_upload_to_user(char __user *buffer,
585 const struct uinput_ff_upload *ff_up)
586{
587 if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload)))
588 return -EFAULT;
589
590 return 0;
591}
592
593static int uinput_ff_upload_from_user(const char __user *buffer,
594 struct uinput_ff_upload *ff_up)
595{
596 if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload)))
597 return -EFAULT;
598
599 return 0;
600}
601
602#endif
603
604#define uinput_set_bit(_arg, _bit, _max) \
605({ \
606 int __ret = 0; \
607 if (udev->state == UIST_CREATED) \
608 __ret = -EINVAL; \
609 else if ((_arg) > (_max)) \
610 __ret = -EINVAL; \
611 else set_bit((_arg), udev->dev->_bit); \
612 __ret; \
613})
614
615static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
616 unsigned long arg, void __user *p)
617{
618 int retval;
619 struct uinput_device *udev = file->private_data;
620 struct uinput_ff_upload ff_up;
621 struct uinput_ff_erase ff_erase;
622 struct uinput_request *req;
623 char *phys;
624
625 retval = mutex_lock_interruptible(&udev->mutex);
626 if (retval)
627 return retval;
628
629 if (!udev->dev) {
630 retval = uinput_allocate_device(udev);
631 if (retval)
632 goto out;
633 }
634
635 switch (cmd) {
636 case UI_DEV_CREATE:
637 retval = uinput_create_device(udev);
638 break;
639
640 case UI_DEV_DESTROY:
641 uinput_destroy_device(udev);
642 break;
643
644 case UI_SET_EVBIT:
645 retval = uinput_set_bit(arg, evbit, EV_MAX);
646 break;
647
648 case UI_SET_KEYBIT:
649 retval = uinput_set_bit(arg, keybit, KEY_MAX);
650 break;
651
652 case UI_SET_RELBIT:
653 retval = uinput_set_bit(arg, relbit, REL_MAX);
654 break;
655
656 case UI_SET_ABSBIT:
657 retval = uinput_set_bit(arg, absbit, ABS_MAX);
658 break;
659
660 case UI_SET_MSCBIT:
661 retval = uinput_set_bit(arg, mscbit, MSC_MAX);
662 break;
663
664 case UI_SET_LEDBIT:
665 retval = uinput_set_bit(arg, ledbit, LED_MAX);
666 break;
667
668 case UI_SET_SNDBIT:
669 retval = uinput_set_bit(arg, sndbit, SND_MAX);
670 break;
671
672 case UI_SET_FFBIT:
673 retval = uinput_set_bit(arg, ffbit, FF_MAX);
674 break;
675
676 case UI_SET_SWBIT:
677 retval = uinput_set_bit(arg, swbit, SW_MAX);
678 break;
679
680 case UI_SET_PROPBIT:
681 retval = uinput_set_bit(arg, propbit, INPUT_PROP_MAX);
682 break;
683
684 case UI_SET_PHYS:
685 if (udev->state == UIST_CREATED) {
686 retval = -EINVAL;
687 goto out;
688 }
689
690 phys = strndup_user(p, 1024);
691 if (IS_ERR(phys)) {
692 retval = PTR_ERR(phys);
693 goto out;
694 }
695
696 kfree(udev->dev->phys);
697 udev->dev->phys = phys;
698 break;
699
700 case UI_BEGIN_FF_UPLOAD:
701 retval = uinput_ff_upload_from_user(p, &ff_up);
702 if (retval)
703 break;
704
705 req = uinput_request_find(udev, ff_up.request_id);
706 if (!req || req->code != UI_FF_UPLOAD || !req->u.upload.effect) {
707 retval = -EINVAL;
708 break;
709 }
710
711 ff_up.retval = 0;
712 ff_up.effect = *req->u.upload.effect;
713 if (req->u.upload.old)
714 ff_up.old = *req->u.upload.old;
715 else
716 memset(&ff_up.old, 0, sizeof(struct ff_effect));
717
718 retval = uinput_ff_upload_to_user(p, &ff_up);
719 break;
720
721 case UI_BEGIN_FF_ERASE:
722 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
723 retval = -EFAULT;
724 break;
725 }
726
727 req = uinput_request_find(udev, ff_erase.request_id);
728 if (!req || req->code != UI_FF_ERASE) {
729 retval = -EINVAL;
730 break;
731 }
732
733 ff_erase.retval = 0;
734 ff_erase.effect_id = req->u.effect_id;
735 if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
736 retval = -EFAULT;
737 break;
738 }
739
740 break;
741
742 case UI_END_FF_UPLOAD:
743 retval = uinput_ff_upload_from_user(p, &ff_up);
744 if (retval)
745 break;
746
747 req = uinput_request_find(udev, ff_up.request_id);
748 if (!req || req->code != UI_FF_UPLOAD ||
749 !req->u.upload.effect) {
750 retval = -EINVAL;
751 break;
752 }
753
754 req->retval = ff_up.retval;
755 uinput_request_done(udev, req);
756 break;
757
758 case UI_END_FF_ERASE:
759 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
760 retval = -EFAULT;
761 break;
762 }
763
764 req = uinput_request_find(udev, ff_erase.request_id);
765 if (!req || req->code != UI_FF_ERASE) {
766 retval = -EINVAL;
767 break;
768 }
769
770 req->retval = ff_erase.retval;
771 uinput_request_done(udev, req);
772 break;
773
774 default:
775 retval = -EINVAL;
776 }
777
778 out:
779 mutex_unlock(&udev->mutex);
780 return retval;
781}
782
783static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
784{
785 return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg);
786}
787
788#ifdef CONFIG_COMPAT
789static long uinput_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
790{
791 return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg));
792}
793#endif
794
795static const struct file_operations uinput_fops = {
796 .owner = THIS_MODULE,
797 .open = uinput_open,
798 .release = uinput_release,
799 .read = uinput_read,
800 .write = uinput_write,
801 .poll = uinput_poll,
802 .unlocked_ioctl = uinput_ioctl,
803#ifdef CONFIG_COMPAT
804 .compat_ioctl = uinput_compat_ioctl,
805#endif
806 .llseek = no_llseek,
807};
808
809static struct miscdevice uinput_misc = {
810 .fops = &uinput_fops,
811 .minor = UINPUT_MINOR,
812 .name = UINPUT_NAME,
813};
814MODULE_ALIAS_MISCDEV(UINPUT_MINOR);
815MODULE_ALIAS("devname:" UINPUT_NAME);
816
817static int __init uinput_init(void)
818{
819 return misc_register(&uinput_misc);
820}
821
822static void __exit uinput_exit(void)
823{
824 misc_deregister(&uinput_misc);
825}
826
827MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
828MODULE_DESCRIPTION("User level driver support for input subsystem");
829MODULE_LICENSE("GPL");
830MODULE_VERSION("0.3");
831
832module_init(uinput_init);
833module_exit(uinput_exit);
834
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * User level driver support for input subsystem
4 *
5 * Heavily based on evdev.c by Vojtech Pavlik
6 *
7 * Author: Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org>
8 *
9 * Changes/Revisions:
10 * 0.4 01/09/2014 (Benjamin Tissoires <benjamin.tissoires@redhat.com>)
11 * - add UI_GET_SYSNAME ioctl
12 * 0.3 09/04/2006 (Anssi Hannula <anssi.hannula@gmail.com>)
13 * - updated ff support for the changes in kernel interface
14 * - added MODULE_VERSION
15 * 0.2 16/10/2004 (Micah Dowty <micah@navi.cx>)
16 * - added force feedback support
17 * - added UI_SET_PHYS
18 * 0.1 20/06/2002
19 * - first public version
20 */
21#include <uapi/linux/uinput.h>
22#include <linux/poll.h>
23#include <linux/sched.h>
24#include <linux/slab.h>
25#include <linux/module.h>
26#include <linux/init.h>
27#include <linux/fs.h>
28#include <linux/miscdevice.h>
29#include <linux/overflow.h>
30#include <linux/input/mt.h>
31#include "../input-compat.h"
32
33#define UINPUT_NAME "uinput"
34#define UINPUT_BUFFER_SIZE 16
35#define UINPUT_NUM_REQUESTS 16
36
37enum uinput_state { UIST_NEW_DEVICE, UIST_SETUP_COMPLETE, UIST_CREATED };
38
39struct uinput_request {
40 unsigned int id;
41 unsigned int code; /* UI_FF_UPLOAD, UI_FF_ERASE */
42
43 int retval;
44 struct completion done;
45
46 union {
47 unsigned int effect_id;
48 struct {
49 struct ff_effect *effect;
50 struct ff_effect *old;
51 } upload;
52 } u;
53};
54
55struct uinput_device {
56 struct input_dev *dev;
57 struct mutex mutex;
58 enum uinput_state state;
59 wait_queue_head_t waitq;
60 unsigned char ready;
61 unsigned char head;
62 unsigned char tail;
63 struct input_event buff[UINPUT_BUFFER_SIZE];
64 unsigned int ff_effects_max;
65
66 struct uinput_request *requests[UINPUT_NUM_REQUESTS];
67 wait_queue_head_t requests_waitq;
68 spinlock_t requests_lock;
69};
70
71static int uinput_dev_event(struct input_dev *dev,
72 unsigned int type, unsigned int code, int value)
73{
74 struct uinput_device *udev = input_get_drvdata(dev);
75 struct timespec64 ts;
76
77 udev->buff[udev->head].type = type;
78 udev->buff[udev->head].code = code;
79 udev->buff[udev->head].value = value;
80 ktime_get_ts64(&ts);
81 udev->buff[udev->head].input_event_sec = ts.tv_sec;
82 udev->buff[udev->head].input_event_usec = ts.tv_nsec / NSEC_PER_USEC;
83 udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE;
84
85 wake_up_interruptible(&udev->waitq);
86
87 return 0;
88}
89
90/* Atomically allocate an ID for the given request. Returns 0 on success. */
91static bool uinput_request_alloc_id(struct uinput_device *udev,
92 struct uinput_request *request)
93{
94 unsigned int id;
95 bool reserved = false;
96
97 spin_lock(&udev->requests_lock);
98
99 for (id = 0; id < UINPUT_NUM_REQUESTS; id++) {
100 if (!udev->requests[id]) {
101 request->id = id;
102 udev->requests[id] = request;
103 reserved = true;
104 break;
105 }
106 }
107
108 spin_unlock(&udev->requests_lock);
109 return reserved;
110}
111
112static struct uinput_request *uinput_request_find(struct uinput_device *udev,
113 unsigned int id)
114{
115 /* Find an input request, by ID. Returns NULL if the ID isn't valid. */
116 if (id >= UINPUT_NUM_REQUESTS)
117 return NULL;
118
119 return udev->requests[id];
120}
121
122static int uinput_request_reserve_slot(struct uinput_device *udev,
123 struct uinput_request *request)
124{
125 /* Allocate slot. If none are available right away, wait. */
126 return wait_event_interruptible(udev->requests_waitq,
127 uinput_request_alloc_id(udev, request));
128}
129
130static void uinput_request_release_slot(struct uinput_device *udev,
131 unsigned int id)
132{
133 /* Mark slot as available */
134 spin_lock(&udev->requests_lock);
135 udev->requests[id] = NULL;
136 spin_unlock(&udev->requests_lock);
137
138 wake_up(&udev->requests_waitq);
139}
140
141static int uinput_request_send(struct uinput_device *udev,
142 struct uinput_request *request)
143{
144 int retval;
145
146 retval = mutex_lock_interruptible(&udev->mutex);
147 if (retval)
148 return retval;
149
150 if (udev->state != UIST_CREATED) {
151 retval = -ENODEV;
152 goto out;
153 }
154
155 init_completion(&request->done);
156
157 /*
158 * Tell our userspace application about this new request
159 * by queueing an input event.
160 */
161 uinput_dev_event(udev->dev, EV_UINPUT, request->code, request->id);
162
163 out:
164 mutex_unlock(&udev->mutex);
165 return retval;
166}
167
168static int uinput_request_submit(struct uinput_device *udev,
169 struct uinput_request *request)
170{
171 int retval;
172
173 retval = uinput_request_reserve_slot(udev, request);
174 if (retval)
175 return retval;
176
177 retval = uinput_request_send(udev, request);
178 if (retval)
179 goto out;
180
181 if (!wait_for_completion_timeout(&request->done, 30 * HZ)) {
182 retval = -ETIMEDOUT;
183 goto out;
184 }
185
186 retval = request->retval;
187
188 out:
189 uinput_request_release_slot(udev, request->id);
190 return retval;
191}
192
193/*
194 * Fail all outstanding requests so handlers don't wait for the userspace
195 * to finish processing them.
196 */
197static void uinput_flush_requests(struct uinput_device *udev)
198{
199 struct uinput_request *request;
200 int i;
201
202 spin_lock(&udev->requests_lock);
203
204 for (i = 0; i < UINPUT_NUM_REQUESTS; i++) {
205 request = udev->requests[i];
206 if (request) {
207 request->retval = -ENODEV;
208 complete(&request->done);
209 }
210 }
211
212 spin_unlock(&udev->requests_lock);
213}
214
215static void uinput_dev_set_gain(struct input_dev *dev, u16 gain)
216{
217 uinput_dev_event(dev, EV_FF, FF_GAIN, gain);
218}
219
220static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude)
221{
222 uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude);
223}
224
225static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value)
226{
227 return uinput_dev_event(dev, EV_FF, effect_id, value);
228}
229
230static int uinput_dev_upload_effect(struct input_dev *dev,
231 struct ff_effect *effect,
232 struct ff_effect *old)
233{
234 struct uinput_device *udev = input_get_drvdata(dev);
235 struct uinput_request request;
236
237 /*
238 * uinput driver does not currently support periodic effects with
239 * custom waveform since it does not have a way to pass buffer of
240 * samples (custom_data) to userspace. If ever there is a device
241 * supporting custom waveforms we would need to define an additional
242 * ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out.
243 */
244 if (effect->type == FF_PERIODIC &&
245 effect->u.periodic.waveform == FF_CUSTOM)
246 return -EINVAL;
247
248 request.code = UI_FF_UPLOAD;
249 request.u.upload.effect = effect;
250 request.u.upload.old = old;
251
252 return uinput_request_submit(udev, &request);
253}
254
255static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id)
256{
257 struct uinput_device *udev = input_get_drvdata(dev);
258 struct uinput_request request;
259
260 if (!test_bit(EV_FF, dev->evbit))
261 return -ENOSYS;
262
263 request.code = UI_FF_ERASE;
264 request.u.effect_id = effect_id;
265
266 return uinput_request_submit(udev, &request);
267}
268
269static int uinput_dev_flush(struct input_dev *dev, struct file *file)
270{
271 /*
272 * If we are called with file == NULL that means we are tearing
273 * down the device, and therefore we can not handle FF erase
274 * requests: either we are handling UI_DEV_DESTROY (and holding
275 * the udev->mutex), or the file descriptor is closed and there is
276 * nobody on the other side anymore.
277 */
278 return file ? input_ff_flush(dev, file) : 0;
279}
280
281static void uinput_destroy_device(struct uinput_device *udev)
282{
283 const char *name, *phys;
284 struct input_dev *dev = udev->dev;
285 enum uinput_state old_state = udev->state;
286
287 udev->state = UIST_NEW_DEVICE;
288
289 if (dev) {
290 name = dev->name;
291 phys = dev->phys;
292 if (old_state == UIST_CREATED) {
293 uinput_flush_requests(udev);
294 input_unregister_device(dev);
295 } else {
296 input_free_device(dev);
297 }
298 kfree(name);
299 kfree(phys);
300 udev->dev = NULL;
301 }
302}
303
304static int uinput_create_device(struct uinput_device *udev)
305{
306 struct input_dev *dev = udev->dev;
307 int error, nslot;
308
309 if (udev->state != UIST_SETUP_COMPLETE) {
310 printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
311 return -EINVAL;
312 }
313
314 if (test_bit(EV_ABS, dev->evbit)) {
315 input_alloc_absinfo(dev);
316 if (!dev->absinfo) {
317 error = -EINVAL;
318 goto fail1;
319 }
320
321 if (test_bit(ABS_MT_SLOT, dev->absbit)) {
322 nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1;
323 error = input_mt_init_slots(dev, nslot, 0);
324 if (error)
325 goto fail1;
326 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
327 input_set_events_per_packet(dev, 60);
328 }
329 }
330
331 if (test_bit(EV_FF, dev->evbit) && !udev->ff_effects_max) {
332 printk(KERN_DEBUG "%s: ff_effects_max should be non-zero when FF_BIT is set\n",
333 UINPUT_NAME);
334 error = -EINVAL;
335 goto fail1;
336 }
337
338 if (udev->ff_effects_max) {
339 error = input_ff_create(dev, udev->ff_effects_max);
340 if (error)
341 goto fail1;
342
343 dev->ff->upload = uinput_dev_upload_effect;
344 dev->ff->erase = uinput_dev_erase_effect;
345 dev->ff->playback = uinput_dev_playback;
346 dev->ff->set_gain = uinput_dev_set_gain;
347 dev->ff->set_autocenter = uinput_dev_set_autocenter;
348 /*
349 * The standard input_ff_flush() implementation does
350 * not quite work for uinput as we can't reasonably
351 * handle FF requests during device teardown.
352 */
353 dev->flush = uinput_dev_flush;
354 }
355
356 dev->event = uinput_dev_event;
357
358 input_set_drvdata(udev->dev, udev);
359
360 error = input_register_device(udev->dev);
361 if (error)
362 goto fail2;
363
364 udev->state = UIST_CREATED;
365
366 return 0;
367
368 fail2: input_ff_destroy(dev);
369 fail1: uinput_destroy_device(udev);
370 return error;
371}
372
373static int uinput_open(struct inode *inode, struct file *file)
374{
375 struct uinput_device *newdev;
376
377 newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL);
378 if (!newdev)
379 return -ENOMEM;
380
381 mutex_init(&newdev->mutex);
382 spin_lock_init(&newdev->requests_lock);
383 init_waitqueue_head(&newdev->requests_waitq);
384 init_waitqueue_head(&newdev->waitq);
385 newdev->state = UIST_NEW_DEVICE;
386
387 file->private_data = newdev;
388 stream_open(inode, file);
389
390 return 0;
391}
392
393static int uinput_validate_absinfo(struct input_dev *dev, unsigned int code,
394 const struct input_absinfo *abs)
395{
396 int min, max, range;
397
398 min = abs->minimum;
399 max = abs->maximum;
400
401 if ((min != 0 || max != 0) && max < min) {
402 printk(KERN_DEBUG
403 "%s: invalid abs[%02x] min:%d max:%d\n",
404 UINPUT_NAME, code, min, max);
405 return -EINVAL;
406 }
407
408 if (!check_sub_overflow(max, min, &range) && abs->flat > range) {
409 printk(KERN_DEBUG
410 "%s: abs_flat #%02x out of range: %d (min:%d/max:%d)\n",
411 UINPUT_NAME, code, abs->flat, min, max);
412 return -EINVAL;
413 }
414
415 return 0;
416}
417
418static int uinput_validate_absbits(struct input_dev *dev)
419{
420 unsigned int cnt;
421 int error;
422
423 if (!test_bit(EV_ABS, dev->evbit))
424 return 0;
425
426 /*
427 * Check if absmin/absmax/absfuzz/absflat are sane.
428 */
429
430 for_each_set_bit(cnt, dev->absbit, ABS_CNT) {
431 if (!dev->absinfo)
432 return -EINVAL;
433
434 error = uinput_validate_absinfo(dev, cnt, &dev->absinfo[cnt]);
435 if (error)
436 return error;
437 }
438
439 return 0;
440}
441
442static int uinput_dev_setup(struct uinput_device *udev,
443 struct uinput_setup __user *arg)
444{
445 struct uinput_setup setup;
446 struct input_dev *dev;
447
448 if (udev->state == UIST_CREATED)
449 return -EINVAL;
450
451 if (copy_from_user(&setup, arg, sizeof(setup)))
452 return -EFAULT;
453
454 if (!setup.name[0])
455 return -EINVAL;
456
457 dev = udev->dev;
458 dev->id = setup.id;
459 udev->ff_effects_max = setup.ff_effects_max;
460
461 kfree(dev->name);
462 dev->name = kstrndup(setup.name, UINPUT_MAX_NAME_SIZE, GFP_KERNEL);
463 if (!dev->name)
464 return -ENOMEM;
465
466 udev->state = UIST_SETUP_COMPLETE;
467 return 0;
468}
469
470static int uinput_abs_setup(struct uinput_device *udev,
471 struct uinput_setup __user *arg, size_t size)
472{
473 struct uinput_abs_setup setup = {};
474 struct input_dev *dev;
475 int error;
476
477 if (size > sizeof(setup))
478 return -E2BIG;
479
480 if (udev->state == UIST_CREATED)
481 return -EINVAL;
482
483 if (copy_from_user(&setup, arg, size))
484 return -EFAULT;
485
486 if (setup.code > ABS_MAX)
487 return -ERANGE;
488
489 dev = udev->dev;
490
491 error = uinput_validate_absinfo(dev, setup.code, &setup.absinfo);
492 if (error)
493 return error;
494
495 input_alloc_absinfo(dev);
496 if (!dev->absinfo)
497 return -ENOMEM;
498
499 set_bit(setup.code, dev->absbit);
500 dev->absinfo[setup.code] = setup.absinfo;
501 return 0;
502}
503
504/* legacy setup via write() */
505static int uinput_setup_device_legacy(struct uinput_device *udev,
506 const char __user *buffer, size_t count)
507{
508 struct uinput_user_dev *user_dev;
509 struct input_dev *dev;
510 int i;
511 int retval;
512
513 if (count != sizeof(struct uinput_user_dev))
514 return -EINVAL;
515
516 if (!udev->dev) {
517 udev->dev = input_allocate_device();
518 if (!udev->dev)
519 return -ENOMEM;
520 }
521
522 dev = udev->dev;
523
524 user_dev = memdup_user(buffer, sizeof(struct uinput_user_dev));
525 if (IS_ERR(user_dev))
526 return PTR_ERR(user_dev);
527
528 udev->ff_effects_max = user_dev->ff_effects_max;
529
530 /* Ensure name is filled in */
531 if (!user_dev->name[0]) {
532 retval = -EINVAL;
533 goto exit;
534 }
535
536 kfree(dev->name);
537 dev->name = kstrndup(user_dev->name, UINPUT_MAX_NAME_SIZE,
538 GFP_KERNEL);
539 if (!dev->name) {
540 retval = -ENOMEM;
541 goto exit;
542 }
543
544 dev->id.bustype = user_dev->id.bustype;
545 dev->id.vendor = user_dev->id.vendor;
546 dev->id.product = user_dev->id.product;
547 dev->id.version = user_dev->id.version;
548
549 for (i = 0; i < ABS_CNT; i++) {
550 input_abs_set_max(dev, i, user_dev->absmax[i]);
551 input_abs_set_min(dev, i, user_dev->absmin[i]);
552 input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]);
553 input_abs_set_flat(dev, i, user_dev->absflat[i]);
554 }
555
556 retval = uinput_validate_absbits(dev);
557 if (retval < 0)
558 goto exit;
559
560 udev->state = UIST_SETUP_COMPLETE;
561 retval = count;
562
563 exit:
564 kfree(user_dev);
565 return retval;
566}
567
568static ssize_t uinput_inject_events(struct uinput_device *udev,
569 const char __user *buffer, size_t count)
570{
571 struct input_event ev;
572 size_t bytes = 0;
573
574 if (count != 0 && count < input_event_size())
575 return -EINVAL;
576
577 while (bytes + input_event_size() <= count) {
578 /*
579 * Note that even if some events were fetched successfully
580 * we are still going to return EFAULT instead of partial
581 * count to let userspace know that it got it's buffers
582 * all wrong.
583 */
584 if (input_event_from_user(buffer + bytes, &ev))
585 return -EFAULT;
586
587 input_event(udev->dev, ev.type, ev.code, ev.value);
588 bytes += input_event_size();
589 cond_resched();
590 }
591
592 return bytes;
593}
594
595static ssize_t uinput_write(struct file *file, const char __user *buffer,
596 size_t count, loff_t *ppos)
597{
598 struct uinput_device *udev = file->private_data;
599 int retval;
600
601 if (count == 0)
602 return 0;
603
604 retval = mutex_lock_interruptible(&udev->mutex);
605 if (retval)
606 return retval;
607
608 retval = udev->state == UIST_CREATED ?
609 uinput_inject_events(udev, buffer, count) :
610 uinput_setup_device_legacy(udev, buffer, count);
611
612 mutex_unlock(&udev->mutex);
613
614 return retval;
615}
616
617static bool uinput_fetch_next_event(struct uinput_device *udev,
618 struct input_event *event)
619{
620 bool have_event;
621
622 spin_lock_irq(&udev->dev->event_lock);
623
624 have_event = udev->head != udev->tail;
625 if (have_event) {
626 *event = udev->buff[udev->tail];
627 udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
628 }
629
630 spin_unlock_irq(&udev->dev->event_lock);
631
632 return have_event;
633}
634
635static ssize_t uinput_events_to_user(struct uinput_device *udev,
636 char __user *buffer, size_t count)
637{
638 struct input_event event;
639 size_t read = 0;
640
641 while (read + input_event_size() <= count &&
642 uinput_fetch_next_event(udev, &event)) {
643
644 if (input_event_to_user(buffer + read, &event))
645 return -EFAULT;
646
647 read += input_event_size();
648 }
649
650 return read;
651}
652
653static ssize_t uinput_read(struct file *file, char __user *buffer,
654 size_t count, loff_t *ppos)
655{
656 struct uinput_device *udev = file->private_data;
657 ssize_t retval;
658
659 if (count != 0 && count < input_event_size())
660 return -EINVAL;
661
662 do {
663 retval = mutex_lock_interruptible(&udev->mutex);
664 if (retval)
665 return retval;
666
667 if (udev->state != UIST_CREATED)
668 retval = -ENODEV;
669 else if (udev->head == udev->tail &&
670 (file->f_flags & O_NONBLOCK))
671 retval = -EAGAIN;
672 else
673 retval = uinput_events_to_user(udev, buffer, count);
674
675 mutex_unlock(&udev->mutex);
676
677 if (retval || count == 0)
678 break;
679
680 if (!(file->f_flags & O_NONBLOCK))
681 retval = wait_event_interruptible(udev->waitq,
682 udev->head != udev->tail ||
683 udev->state != UIST_CREATED);
684 } while (retval == 0);
685
686 return retval;
687}
688
689static __poll_t uinput_poll(struct file *file, poll_table *wait)
690{
691 struct uinput_device *udev = file->private_data;
692
693 poll_wait(file, &udev->waitq, wait);
694
695 if (udev->head != udev->tail)
696 return EPOLLIN | EPOLLRDNORM;
697
698 return 0;
699}
700
701static int uinput_release(struct inode *inode, struct file *file)
702{
703 struct uinput_device *udev = file->private_data;
704
705 uinput_destroy_device(udev);
706 kfree(udev);
707
708 return 0;
709}
710
711#ifdef CONFIG_COMPAT
712struct uinput_ff_upload_compat {
713 __u32 request_id;
714 __s32 retval;
715 struct ff_effect_compat effect;
716 struct ff_effect_compat old;
717};
718
719static int uinput_ff_upload_to_user(char __user *buffer,
720 const struct uinput_ff_upload *ff_up)
721{
722 if (in_compat_syscall()) {
723 struct uinput_ff_upload_compat ff_up_compat;
724
725 ff_up_compat.request_id = ff_up->request_id;
726 ff_up_compat.retval = ff_up->retval;
727 /*
728 * It so happens that the pointer that gives us the trouble
729 * is the last field in the structure. Since we don't support
730 * custom waveforms in uinput anyway we can just copy the whole
731 * thing (to the compat size) and ignore the pointer.
732 */
733 memcpy(&ff_up_compat.effect, &ff_up->effect,
734 sizeof(struct ff_effect_compat));
735 memcpy(&ff_up_compat.old, &ff_up->old,
736 sizeof(struct ff_effect_compat));
737
738 if (copy_to_user(buffer, &ff_up_compat,
739 sizeof(struct uinput_ff_upload_compat)))
740 return -EFAULT;
741 } else {
742 if (copy_to_user(buffer, ff_up,
743 sizeof(struct uinput_ff_upload)))
744 return -EFAULT;
745 }
746
747 return 0;
748}
749
750static int uinput_ff_upload_from_user(const char __user *buffer,
751 struct uinput_ff_upload *ff_up)
752{
753 if (in_compat_syscall()) {
754 struct uinput_ff_upload_compat ff_up_compat;
755
756 if (copy_from_user(&ff_up_compat, buffer,
757 sizeof(struct uinput_ff_upload_compat)))
758 return -EFAULT;
759
760 ff_up->request_id = ff_up_compat.request_id;
761 ff_up->retval = ff_up_compat.retval;
762 memcpy(&ff_up->effect, &ff_up_compat.effect,
763 sizeof(struct ff_effect_compat));
764 memcpy(&ff_up->old, &ff_up_compat.old,
765 sizeof(struct ff_effect_compat));
766
767 } else {
768 if (copy_from_user(ff_up, buffer,
769 sizeof(struct uinput_ff_upload)))
770 return -EFAULT;
771 }
772
773 return 0;
774}
775
776#else
777
778static int uinput_ff_upload_to_user(char __user *buffer,
779 const struct uinput_ff_upload *ff_up)
780{
781 if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload)))
782 return -EFAULT;
783
784 return 0;
785}
786
787static int uinput_ff_upload_from_user(const char __user *buffer,
788 struct uinput_ff_upload *ff_up)
789{
790 if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload)))
791 return -EFAULT;
792
793 return 0;
794}
795
796#endif
797
798#define uinput_set_bit(_arg, _bit, _max) \
799({ \
800 int __ret = 0; \
801 if (udev->state == UIST_CREATED) \
802 __ret = -EINVAL; \
803 else if ((_arg) > (_max)) \
804 __ret = -EINVAL; \
805 else set_bit((_arg), udev->dev->_bit); \
806 __ret; \
807})
808
809static int uinput_str_to_user(void __user *dest, const char *str,
810 unsigned int maxlen)
811{
812 char __user *p = dest;
813 int len, ret;
814
815 if (!str)
816 return -ENOENT;
817
818 if (maxlen == 0)
819 return -EINVAL;
820
821 len = strlen(str) + 1;
822 if (len > maxlen)
823 len = maxlen;
824
825 ret = copy_to_user(p, str, len);
826 if (ret)
827 return -EFAULT;
828
829 /* force terminating '\0' */
830 ret = put_user(0, p + len - 1);
831 return ret ? -EFAULT : len;
832}
833
834static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
835 unsigned long arg, void __user *p)
836{
837 int retval;
838 struct uinput_device *udev = file->private_data;
839 struct uinput_ff_upload ff_up;
840 struct uinput_ff_erase ff_erase;
841 struct uinput_request *req;
842 char *phys;
843 const char *name;
844 unsigned int size;
845
846 retval = mutex_lock_interruptible(&udev->mutex);
847 if (retval)
848 return retval;
849
850 if (!udev->dev) {
851 udev->dev = input_allocate_device();
852 if (!udev->dev) {
853 retval = -ENOMEM;
854 goto out;
855 }
856 }
857
858 switch (cmd) {
859 case UI_GET_VERSION:
860 if (put_user(UINPUT_VERSION, (unsigned int __user *)p))
861 retval = -EFAULT;
862 goto out;
863
864 case UI_DEV_CREATE:
865 retval = uinput_create_device(udev);
866 goto out;
867
868 case UI_DEV_DESTROY:
869 uinput_destroy_device(udev);
870 goto out;
871
872 case UI_DEV_SETUP:
873 retval = uinput_dev_setup(udev, p);
874 goto out;
875
876 /* UI_ABS_SETUP is handled in the variable size ioctls */
877
878 case UI_SET_EVBIT:
879 retval = uinput_set_bit(arg, evbit, EV_MAX);
880 goto out;
881
882 case UI_SET_KEYBIT:
883 retval = uinput_set_bit(arg, keybit, KEY_MAX);
884 goto out;
885
886 case UI_SET_RELBIT:
887 retval = uinput_set_bit(arg, relbit, REL_MAX);
888 goto out;
889
890 case UI_SET_ABSBIT:
891 retval = uinput_set_bit(arg, absbit, ABS_MAX);
892 goto out;
893
894 case UI_SET_MSCBIT:
895 retval = uinput_set_bit(arg, mscbit, MSC_MAX);
896 goto out;
897
898 case UI_SET_LEDBIT:
899 retval = uinput_set_bit(arg, ledbit, LED_MAX);
900 goto out;
901
902 case UI_SET_SNDBIT:
903 retval = uinput_set_bit(arg, sndbit, SND_MAX);
904 goto out;
905
906 case UI_SET_FFBIT:
907 retval = uinput_set_bit(arg, ffbit, FF_MAX);
908 goto out;
909
910 case UI_SET_SWBIT:
911 retval = uinput_set_bit(arg, swbit, SW_MAX);
912 goto out;
913
914 case UI_SET_PROPBIT:
915 retval = uinput_set_bit(arg, propbit, INPUT_PROP_MAX);
916 goto out;
917
918 case UI_SET_PHYS:
919 if (udev->state == UIST_CREATED) {
920 retval = -EINVAL;
921 goto out;
922 }
923
924 phys = strndup_user(p, 1024);
925 if (IS_ERR(phys)) {
926 retval = PTR_ERR(phys);
927 goto out;
928 }
929
930 kfree(udev->dev->phys);
931 udev->dev->phys = phys;
932 goto out;
933
934 case UI_BEGIN_FF_UPLOAD:
935 retval = uinput_ff_upload_from_user(p, &ff_up);
936 if (retval)
937 goto out;
938
939 req = uinput_request_find(udev, ff_up.request_id);
940 if (!req || req->code != UI_FF_UPLOAD ||
941 !req->u.upload.effect) {
942 retval = -EINVAL;
943 goto out;
944 }
945
946 ff_up.retval = 0;
947 ff_up.effect = *req->u.upload.effect;
948 if (req->u.upload.old)
949 ff_up.old = *req->u.upload.old;
950 else
951 memset(&ff_up.old, 0, sizeof(struct ff_effect));
952
953 retval = uinput_ff_upload_to_user(p, &ff_up);
954 goto out;
955
956 case UI_BEGIN_FF_ERASE:
957 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
958 retval = -EFAULT;
959 goto out;
960 }
961
962 req = uinput_request_find(udev, ff_erase.request_id);
963 if (!req || req->code != UI_FF_ERASE) {
964 retval = -EINVAL;
965 goto out;
966 }
967
968 ff_erase.retval = 0;
969 ff_erase.effect_id = req->u.effect_id;
970 if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
971 retval = -EFAULT;
972 goto out;
973 }
974
975 goto out;
976
977 case UI_END_FF_UPLOAD:
978 retval = uinput_ff_upload_from_user(p, &ff_up);
979 if (retval)
980 goto out;
981
982 req = uinput_request_find(udev, ff_up.request_id);
983 if (!req || req->code != UI_FF_UPLOAD ||
984 !req->u.upload.effect) {
985 retval = -EINVAL;
986 goto out;
987 }
988
989 req->retval = ff_up.retval;
990 complete(&req->done);
991 goto out;
992
993 case UI_END_FF_ERASE:
994 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
995 retval = -EFAULT;
996 goto out;
997 }
998
999 req = uinput_request_find(udev, ff_erase.request_id);
1000 if (!req || req->code != UI_FF_ERASE) {
1001 retval = -EINVAL;
1002 goto out;
1003 }
1004
1005 req->retval = ff_erase.retval;
1006 complete(&req->done);
1007 goto out;
1008 }
1009
1010 size = _IOC_SIZE(cmd);
1011
1012 /* Now check variable-length commands */
1013 switch (cmd & ~IOCSIZE_MASK) {
1014 case UI_GET_SYSNAME(0):
1015 if (udev->state != UIST_CREATED) {
1016 retval = -ENOENT;
1017 goto out;
1018 }
1019 name = dev_name(&udev->dev->dev);
1020 retval = uinput_str_to_user(p, name, size);
1021 goto out;
1022
1023 case UI_ABS_SETUP & ~IOCSIZE_MASK:
1024 retval = uinput_abs_setup(udev, p, size);
1025 goto out;
1026 }
1027
1028 retval = -EINVAL;
1029 out:
1030 mutex_unlock(&udev->mutex);
1031 return retval;
1032}
1033
1034static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1035{
1036 return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg);
1037}
1038
1039#ifdef CONFIG_COMPAT
1040
1041/*
1042 * These IOCTLs change their size and thus their numbers between
1043 * 32 and 64 bits.
1044 */
1045#define UI_SET_PHYS_COMPAT \
1046 _IOW(UINPUT_IOCTL_BASE, 108, compat_uptr_t)
1047#define UI_BEGIN_FF_UPLOAD_COMPAT \
1048 _IOWR(UINPUT_IOCTL_BASE, 200, struct uinput_ff_upload_compat)
1049#define UI_END_FF_UPLOAD_COMPAT \
1050 _IOW(UINPUT_IOCTL_BASE, 201, struct uinput_ff_upload_compat)
1051
1052static long uinput_compat_ioctl(struct file *file,
1053 unsigned int cmd, unsigned long arg)
1054{
1055 switch (cmd) {
1056 case UI_SET_PHYS_COMPAT:
1057 cmd = UI_SET_PHYS;
1058 break;
1059 case UI_BEGIN_FF_UPLOAD_COMPAT:
1060 cmd = UI_BEGIN_FF_UPLOAD;
1061 break;
1062 case UI_END_FF_UPLOAD_COMPAT:
1063 cmd = UI_END_FF_UPLOAD;
1064 break;
1065 }
1066
1067 return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg));
1068}
1069#endif
1070
1071static const struct file_operations uinput_fops = {
1072 .owner = THIS_MODULE,
1073 .open = uinput_open,
1074 .release = uinput_release,
1075 .read = uinput_read,
1076 .write = uinput_write,
1077 .poll = uinput_poll,
1078 .unlocked_ioctl = uinput_ioctl,
1079#ifdef CONFIG_COMPAT
1080 .compat_ioctl = uinput_compat_ioctl,
1081#endif
1082 .llseek = no_llseek,
1083};
1084
1085static struct miscdevice uinput_misc = {
1086 .fops = &uinput_fops,
1087 .minor = UINPUT_MINOR,
1088 .name = UINPUT_NAME,
1089};
1090module_misc_device(uinput_misc);
1091
1092MODULE_ALIAS_MISCDEV(UINPUT_MINOR);
1093MODULE_ALIAS("devname:" UINPUT_NAME);
1094
1095MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
1096MODULE_DESCRIPTION("User level driver support for input subsystem");
1097MODULE_LICENSE("GPL");