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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 * 0.4 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
45static 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. */
62static 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
83static 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
93static 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
101static 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
111static 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
138static 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 */
161static 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
179static void uinput_dev_set_gain(struct input_dev *dev, u16 gain)
180{
181 uinput_dev_event(dev, EV_FF, FF_GAIN, gain);
182}
183
184static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude)
185{
186 uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude);
187}
188
189static 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
194static 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
219static 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
233static 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
256static 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
291static 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
311static int uinput_validate_absbits(struct input_dev *dev)
312{
313 unsigned int cnt;
314 int retval = 0;
315
316 for (cnt = 0; cnt < ABS_CNT; cnt++) {
317 int min, max;
318 if (!test_bit(cnt, dev->absbit))
319 continue;
320
321 min = input_abs_get_min(dev, cnt);
322 max = input_abs_get_max(dev, cnt);
323
324 if ((min != 0 || max != 0) && max <= min) {
325 printk(KERN_DEBUG
326 "%s: invalid abs[%02x] min:%d max:%d\n",
327 UINPUT_NAME, cnt,
328 input_abs_get_min(dev, cnt),
329 input_abs_get_max(dev, cnt));
330 retval = -EINVAL;
331 break;
332 }
333
334 if (input_abs_get_flat(dev, cnt) >
335 input_abs_get_max(dev, cnt) - input_abs_get_min(dev, cnt)) {
336 printk(KERN_DEBUG
337 "%s: abs_flat #%02x out of range: %d "
338 "(min:%d/max:%d)\n",
339 UINPUT_NAME, cnt,
340 input_abs_get_flat(dev, cnt),
341 input_abs_get_min(dev, cnt),
342 input_abs_get_max(dev, cnt));
343 retval = -EINVAL;
344 break;
345 }
346 }
347 return retval;
348}
349
350static int uinput_allocate_device(struct uinput_device *udev)
351{
352 udev->dev = input_allocate_device();
353 if (!udev->dev)
354 return -ENOMEM;
355
356 udev->dev->event = uinput_dev_event;
357 input_set_drvdata(udev->dev, udev);
358
359 return 0;
360}
361
362static int uinput_setup_device(struct uinput_device *udev,
363 const char __user *buffer, size_t count)
364{
365 struct uinput_user_dev *user_dev;
366 struct input_dev *dev;
367 int i;
368 int retval;
369
370 if (count != sizeof(struct uinput_user_dev))
371 return -EINVAL;
372
373 if (!udev->dev) {
374 retval = uinput_allocate_device(udev);
375 if (retval)
376 return retval;
377 }
378
379 dev = udev->dev;
380
381 user_dev = memdup_user(buffer, sizeof(struct uinput_user_dev));
382 if (IS_ERR(user_dev))
383 return PTR_ERR(user_dev);
384
385 udev->ff_effects_max = user_dev->ff_effects_max;
386
387 /* Ensure name is filled in */
388 if (!user_dev->name[0]) {
389 retval = -EINVAL;
390 goto exit;
391 }
392
393 kfree(dev->name);
394 dev->name = kstrndup(user_dev->name, UINPUT_MAX_NAME_SIZE,
395 GFP_KERNEL);
396 if (!dev->name) {
397 retval = -ENOMEM;
398 goto exit;
399 }
400
401 dev->id.bustype = user_dev->id.bustype;
402 dev->id.vendor = user_dev->id.vendor;
403 dev->id.product = user_dev->id.product;
404 dev->id.version = user_dev->id.version;
405
406 for (i = 0; i < ABS_CNT; i++) {
407 input_abs_set_max(dev, i, user_dev->absmax[i]);
408 input_abs_set_min(dev, i, user_dev->absmin[i]);
409 input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]);
410 input_abs_set_flat(dev, i, user_dev->absflat[i]);
411 }
412
413 /* check if absmin/absmax/absfuzz/absflat are filled as
414 * told in Documentation/input/input-programming.txt */
415 if (test_bit(EV_ABS, dev->evbit)) {
416 retval = uinput_validate_absbits(dev);
417 if (retval < 0)
418 goto exit;
419 if (test_bit(ABS_MT_SLOT, dev->absbit)) {
420 int nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1;
421 input_mt_init_slots(dev, nslot, 0);
422 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
423 input_set_events_per_packet(dev, 60);
424 }
425 }
426
427 udev->state = UIST_SETUP_COMPLETE;
428 retval = count;
429
430 exit:
431 kfree(user_dev);
432 return retval;
433}
434
435static ssize_t uinput_inject_events(struct uinput_device *udev,
436 const char __user *buffer, size_t count)
437{
438 struct input_event ev;
439 size_t bytes = 0;
440
441 if (count != 0 && count < input_event_size())
442 return -EINVAL;
443
444 while (bytes + input_event_size() <= count) {
445 /*
446 * Note that even if some events were fetched successfully
447 * we are still going to return EFAULT instead of partial
448 * count to let userspace know that it got it's buffers
449 * all wrong.
450 */
451 if (input_event_from_user(buffer + bytes, &ev))
452 return -EFAULT;
453
454 input_event(udev->dev, ev.type, ev.code, ev.value);
455 bytes += input_event_size();
456 }
457
458 return bytes;
459}
460
461static ssize_t uinput_write(struct file *file, const char __user *buffer,
462 size_t count, loff_t *ppos)
463{
464 struct uinput_device *udev = file->private_data;
465 int retval;
466
467 if (count == 0)
468 return 0;
469
470 retval = mutex_lock_interruptible(&udev->mutex);
471 if (retval)
472 return retval;
473
474 retval = udev->state == UIST_CREATED ?
475 uinput_inject_events(udev, buffer, count) :
476 uinput_setup_device(udev, buffer, count);
477
478 mutex_unlock(&udev->mutex);
479
480 return retval;
481}
482
483static bool uinput_fetch_next_event(struct uinput_device *udev,
484 struct input_event *event)
485{
486 bool have_event;
487
488 spin_lock_irq(&udev->dev->event_lock);
489
490 have_event = udev->head != udev->tail;
491 if (have_event) {
492 *event = udev->buff[udev->tail];
493 udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
494 }
495
496 spin_unlock_irq(&udev->dev->event_lock);
497
498 return have_event;
499}
500
501static ssize_t uinput_events_to_user(struct uinput_device *udev,
502 char __user *buffer, size_t count)
503{
504 struct input_event event;
505 size_t read = 0;
506
507 while (read + input_event_size() <= count &&
508 uinput_fetch_next_event(udev, &event)) {
509
510 if (input_event_to_user(buffer + read, &event))
511 return -EFAULT;
512
513 read += input_event_size();
514 }
515
516 return read;
517}
518
519static ssize_t uinput_read(struct file *file, char __user *buffer,
520 size_t count, loff_t *ppos)
521{
522 struct uinput_device *udev = file->private_data;
523 ssize_t retval;
524
525 if (count != 0 && count < input_event_size())
526 return -EINVAL;
527
528 do {
529 retval = mutex_lock_interruptible(&udev->mutex);
530 if (retval)
531 return retval;
532
533 if (udev->state != UIST_CREATED)
534 retval = -ENODEV;
535 else if (udev->head == udev->tail &&
536 (file->f_flags & O_NONBLOCK))
537 retval = -EAGAIN;
538 else
539 retval = uinput_events_to_user(udev, buffer, count);
540
541 mutex_unlock(&udev->mutex);
542
543 if (retval || count == 0)
544 break;
545
546 if (!(file->f_flags & O_NONBLOCK))
547 retval = wait_event_interruptible(udev->waitq,
548 udev->head != udev->tail ||
549 udev->state != UIST_CREATED);
550 } while (retval == 0);
551
552 return retval;
553}
554
555static unsigned int uinput_poll(struct file *file, poll_table *wait)
556{
557 struct uinput_device *udev = file->private_data;
558
559 poll_wait(file, &udev->waitq, wait);
560
561 if (udev->head != udev->tail)
562 return POLLIN | POLLRDNORM;
563
564 return 0;
565}
566
567static int uinput_release(struct inode *inode, struct file *file)
568{
569 struct uinput_device *udev = file->private_data;
570
571 uinput_destroy_device(udev);
572 kfree(udev);
573
574 return 0;
575}
576
577#ifdef CONFIG_COMPAT
578struct uinput_ff_upload_compat {
579 __u32 request_id;
580 __s32 retval;
581 struct ff_effect_compat effect;
582 struct ff_effect_compat old;
583};
584
585static int uinput_ff_upload_to_user(char __user *buffer,
586 const struct uinput_ff_upload *ff_up)
587{
588 if (INPUT_COMPAT_TEST) {
589 struct uinput_ff_upload_compat ff_up_compat;
590
591 ff_up_compat.request_id = ff_up->request_id;
592 ff_up_compat.retval = ff_up->retval;
593 /*
594 * It so happens that the pointer that gives us the trouble
595 * is the last field in the structure. Since we don't support
596 * custom waveforms in uinput anyway we can just copy the whole
597 * thing (to the compat size) and ignore the pointer.
598 */
599 memcpy(&ff_up_compat.effect, &ff_up->effect,
600 sizeof(struct ff_effect_compat));
601 memcpy(&ff_up_compat.old, &ff_up->old,
602 sizeof(struct ff_effect_compat));
603
604 if (copy_to_user(buffer, &ff_up_compat,
605 sizeof(struct uinput_ff_upload_compat)))
606 return -EFAULT;
607 } else {
608 if (copy_to_user(buffer, ff_up,
609 sizeof(struct uinput_ff_upload)))
610 return -EFAULT;
611 }
612
613 return 0;
614}
615
616static int uinput_ff_upload_from_user(const char __user *buffer,
617 struct uinput_ff_upload *ff_up)
618{
619 if (INPUT_COMPAT_TEST) {
620 struct uinput_ff_upload_compat ff_up_compat;
621
622 if (copy_from_user(&ff_up_compat, buffer,
623 sizeof(struct uinput_ff_upload_compat)))
624 return -EFAULT;
625
626 ff_up->request_id = ff_up_compat.request_id;
627 ff_up->retval = ff_up_compat.retval;
628 memcpy(&ff_up->effect, &ff_up_compat.effect,
629 sizeof(struct ff_effect_compat));
630 memcpy(&ff_up->old, &ff_up_compat.old,
631 sizeof(struct ff_effect_compat));
632
633 } else {
634 if (copy_from_user(ff_up, buffer,
635 sizeof(struct uinput_ff_upload)))
636 return -EFAULT;
637 }
638
639 return 0;
640}
641
642#else
643
644static int uinput_ff_upload_to_user(char __user *buffer,
645 const struct uinput_ff_upload *ff_up)
646{
647 if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload)))
648 return -EFAULT;
649
650 return 0;
651}
652
653static int uinput_ff_upload_from_user(const char __user *buffer,
654 struct uinput_ff_upload *ff_up)
655{
656 if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload)))
657 return -EFAULT;
658
659 return 0;
660}
661
662#endif
663
664#define uinput_set_bit(_arg, _bit, _max) \
665({ \
666 int __ret = 0; \
667 if (udev->state == UIST_CREATED) \
668 __ret = -EINVAL; \
669 else if ((_arg) > (_max)) \
670 __ret = -EINVAL; \
671 else set_bit((_arg), udev->dev->_bit); \
672 __ret; \
673})
674
675static int uinput_str_to_user(void __user *dest, const char *str,
676 unsigned int maxlen)
677{
678 char __user *p = dest;
679 int len, ret;
680
681 if (!str)
682 return -ENOENT;
683
684 if (maxlen == 0)
685 return -EINVAL;
686
687 len = strlen(str) + 1;
688 if (len > maxlen)
689 len = maxlen;
690
691 ret = copy_to_user(p, str, len);
692 if (ret)
693 return -EFAULT;
694
695 /* force terminating '\0' */
696 ret = put_user(0, p + len - 1);
697 return ret ? -EFAULT : len;
698}
699
700static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
701 unsigned long arg, void __user *p)
702{
703 int retval;
704 struct uinput_device *udev = file->private_data;
705 struct uinput_ff_upload ff_up;
706 struct uinput_ff_erase ff_erase;
707 struct uinput_request *req;
708 char *phys;
709 const char *name;
710 unsigned int size;
711
712 retval = mutex_lock_interruptible(&udev->mutex);
713 if (retval)
714 return retval;
715
716 if (!udev->dev) {
717 retval = uinput_allocate_device(udev);
718 if (retval)
719 goto out;
720 }
721
722 switch (cmd) {
723 case UI_DEV_CREATE:
724 retval = uinput_create_device(udev);
725 goto out;
726
727 case UI_DEV_DESTROY:
728 uinput_destroy_device(udev);
729 goto out;
730
731 case UI_SET_EVBIT:
732 retval = uinput_set_bit(arg, evbit, EV_MAX);
733 goto out;
734
735 case UI_SET_KEYBIT:
736 retval = uinput_set_bit(arg, keybit, KEY_MAX);
737 goto out;
738
739 case UI_SET_RELBIT:
740 retval = uinput_set_bit(arg, relbit, REL_MAX);
741 goto out;
742
743 case UI_SET_ABSBIT:
744 retval = uinput_set_bit(arg, absbit, ABS_MAX);
745 goto out;
746
747 case UI_SET_MSCBIT:
748 retval = uinput_set_bit(arg, mscbit, MSC_MAX);
749 goto out;
750
751 case UI_SET_LEDBIT:
752 retval = uinput_set_bit(arg, ledbit, LED_MAX);
753 goto out;
754
755 case UI_SET_SNDBIT:
756 retval = uinput_set_bit(arg, sndbit, SND_MAX);
757 goto out;
758
759 case UI_SET_FFBIT:
760 retval = uinput_set_bit(arg, ffbit, FF_MAX);
761 goto out;
762
763 case UI_SET_SWBIT:
764 retval = uinput_set_bit(arg, swbit, SW_MAX);
765 goto out;
766
767 case UI_SET_PROPBIT:
768 retval = uinput_set_bit(arg, propbit, INPUT_PROP_MAX);
769 goto out;
770
771 case UI_SET_PHYS:
772 if (udev->state == UIST_CREATED) {
773 retval = -EINVAL;
774 goto out;
775 }
776
777 phys = strndup_user(p, 1024);
778 if (IS_ERR(phys)) {
779 retval = PTR_ERR(phys);
780 goto out;
781 }
782
783 kfree(udev->dev->phys);
784 udev->dev->phys = phys;
785 goto out;
786
787 case UI_BEGIN_FF_UPLOAD:
788 retval = uinput_ff_upload_from_user(p, &ff_up);
789 if (retval)
790 goto out;
791
792 req = uinput_request_find(udev, ff_up.request_id);
793 if (!req || req->code != UI_FF_UPLOAD ||
794 !req->u.upload.effect) {
795 retval = -EINVAL;
796 goto out;
797 }
798
799 ff_up.retval = 0;
800 ff_up.effect = *req->u.upload.effect;
801 if (req->u.upload.old)
802 ff_up.old = *req->u.upload.old;
803 else
804 memset(&ff_up.old, 0, sizeof(struct ff_effect));
805
806 retval = uinput_ff_upload_to_user(p, &ff_up);
807 goto out;
808
809 case UI_BEGIN_FF_ERASE:
810 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
811 retval = -EFAULT;
812 goto out;
813 }
814
815 req = uinput_request_find(udev, ff_erase.request_id);
816 if (!req || req->code != UI_FF_ERASE) {
817 retval = -EINVAL;
818 goto out;
819 }
820
821 ff_erase.retval = 0;
822 ff_erase.effect_id = req->u.effect_id;
823 if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
824 retval = -EFAULT;
825 goto out;
826 }
827
828 goto out;
829
830 case UI_END_FF_UPLOAD:
831 retval = uinput_ff_upload_from_user(p, &ff_up);
832 if (retval)
833 goto out;
834
835 req = uinput_request_find(udev, ff_up.request_id);
836 if (!req || req->code != UI_FF_UPLOAD ||
837 !req->u.upload.effect) {
838 retval = -EINVAL;
839 goto out;
840 }
841
842 req->retval = ff_up.retval;
843 uinput_request_done(udev, req);
844 goto out;
845
846 case UI_END_FF_ERASE:
847 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
848 retval = -EFAULT;
849 goto out;
850 }
851
852 req = uinput_request_find(udev, ff_erase.request_id);
853 if (!req || req->code != UI_FF_ERASE) {
854 retval = -EINVAL;
855 goto out;
856 }
857
858 req->retval = ff_erase.retval;
859 uinput_request_done(udev, req);
860 goto out;
861 }
862
863 size = _IOC_SIZE(cmd);
864
865 /* Now check variable-length commands */
866 switch (cmd & ~IOCSIZE_MASK) {
867 case UI_GET_SYSNAME(0):
868 if (udev->state != UIST_CREATED) {
869 retval = -ENOENT;
870 goto out;
871 }
872 name = dev_name(&udev->dev->dev);
873 retval = uinput_str_to_user(p, name, size);
874 goto out;
875 }
876
877 retval = -EINVAL;
878 out:
879 mutex_unlock(&udev->mutex);
880 return retval;
881}
882
883static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
884{
885 return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg);
886}
887
888#ifdef CONFIG_COMPAT
889static long uinput_compat_ioctl(struct file *file,
890 unsigned int cmd, unsigned long arg)
891{
892 return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg));
893}
894#endif
895
896static const struct file_operations uinput_fops = {
897 .owner = THIS_MODULE,
898 .open = uinput_open,
899 .release = uinput_release,
900 .read = uinput_read,
901 .write = uinput_write,
902 .poll = uinput_poll,
903 .unlocked_ioctl = uinput_ioctl,
904#ifdef CONFIG_COMPAT
905 .compat_ioctl = uinput_compat_ioctl,
906#endif
907 .llseek = no_llseek,
908};
909
910static struct miscdevice uinput_misc = {
911 .fops = &uinput_fops,
912 .minor = UINPUT_MINOR,
913 .name = UINPUT_NAME,
914};
915MODULE_ALIAS_MISCDEV(UINPUT_MINOR);
916MODULE_ALIAS("devname:" UINPUT_NAME);
917
918static int __init uinput_init(void)
919{
920 return misc_register(&uinput_misc);
921}
922
923static void __exit uinput_exit(void)
924{
925 misc_deregister(&uinput_misc);
926}
927
928MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
929MODULE_DESCRIPTION("User level driver support for input subsystem");
930MODULE_LICENSE("GPL");
931MODULE_VERSION("0.3");
932
933module_init(uinput_init);
934module_exit(uinput_exit);
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");