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Input: dlink-dir685-touchkeys - fix a typo in driver name
[linux/fpc-iii.git] / drivers / input / misc / uinput.c
blobe746920872a4700b54a1db99c496400db627f0c6
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 <uapi/linux/uinput.h>
35 #include <linux/poll.h>
36 #include <linux/sched.h>
37 #include <linux/slab.h>
38 #include <linux/module.h>
39 #include <linux/init.h>
40 #include <linux/fs.h>
41 #include <linux/miscdevice.h>
42 #include <linux/overflow.h>
43 #include <linux/input/mt.h>
44 #include "../input-compat.h"
45
46 #define UINPUT_NAME "uinput"
47 #define UINPUT_BUFFER_SIZE 16
48 #define UINPUT_NUM_REQUESTS 16
49
50 enum uinput_state { UIST_NEW_DEVICE, UIST_SETUP_COMPLETE, UIST_CREATED };
51
52 struct uinput_request {
53 unsigned int id;
54 unsigned int code; /* UI_FF_UPLOAD, UI_FF_ERASE */
55
56 int retval;
57 struct completion done;
58
59 union {
60 unsigned int effect_id;
61 struct {
62 struct ff_effect *effect;
63 struct ff_effect *old;
64 } upload;
65 } u;
66 };
67
68 struct uinput_device {
69 struct input_dev *dev;
70 struct mutex mutex;
71 enum uinput_state state;
72 wait_queue_head_t waitq;
73 unsigned char ready;
74 unsigned char head;
75 unsigned char tail;
76 struct input_event buff[UINPUT_BUFFER_SIZE];
77 unsigned int ff_effects_max;
78
79 struct uinput_request *requests[UINPUT_NUM_REQUESTS];
80 wait_queue_head_t requests_waitq;
81 spinlock_t requests_lock;
82 };
83
84 static int uinput_dev_event(struct input_dev *dev,
85 unsigned int type, unsigned int code, int value)
86 {
87 struct uinput_device *udev = input_get_drvdata(dev);
88 struct timespec64 ts;
89
90 ktime_get_ts64(&ts);
91
92 udev->buff[udev->head] = (struct input_event) {
93 .input_event_sec = ts.tv_sec,
94 .input_event_usec = ts.tv_nsec / NSEC_PER_USEC,
95 .type = type,
96 .code = code,
97 .value = value,
98 };
99
100 udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE;
101
102 wake_up_interruptible(&udev->waitq);
103
104 return 0;
105 }
106
107 /* Atomically allocate an ID for the given request. Returns 0 on success. */
108 static bool uinput_request_alloc_id(struct uinput_device *udev,
109 struct uinput_request *request)
110 {
111 unsigned int id;
112 bool reserved = false;
113
114 spin_lock(&udev->requests_lock);
115
116 for (id = 0; id < UINPUT_NUM_REQUESTS; id++) {
117 if (!udev->requests[id]) {
118 request->id = id;
119 udev->requests[id] = request;
120 reserved = true;
121 break;
122 }
123 }
124
125 spin_unlock(&udev->requests_lock);
126 return reserved;
127 }
128
129 static struct uinput_request *uinput_request_find(struct uinput_device *udev,
130 unsigned int id)
131 {
132 /* Find an input request, by ID. Returns NULL if the ID isn't valid. */
133 if (id >= UINPUT_NUM_REQUESTS)
134 return NULL;
135
136 return udev->requests[id];
137 }
138
139 static int uinput_request_reserve_slot(struct uinput_device *udev,
140 struct uinput_request *request)
141 {
142 /* Allocate slot. If none are available right away, wait. */
143 return wait_event_interruptible(udev->requests_waitq,
144 uinput_request_alloc_id(udev, request));
145 }
146
147 static void uinput_request_release_slot(struct uinput_device *udev,
148 unsigned int id)
149 {
150 /* Mark slot as available */
151 spin_lock(&udev->requests_lock);
152 udev->requests[id] = NULL;
153 spin_unlock(&udev->requests_lock);
154
155 wake_up(&udev->requests_waitq);
156 }
157
158 static int uinput_request_send(struct uinput_device *udev,
159 struct uinput_request *request)
160 {
161 int retval;
162
163 retval = mutex_lock_interruptible(&udev->mutex);
164 if (retval)
165 return retval;
166
167 if (udev->state != UIST_CREATED) {
168 retval = -ENODEV;
169 goto out;
170 }
171
172 init_completion(&request->done);
173
174 /*
175 * Tell our userspace application about this new request
176 * by queueing an input event.
177 */
178 uinput_dev_event(udev->dev, EV_UINPUT, request->code, request->id);
179
180 out:
181 mutex_unlock(&udev->mutex);
182 return retval;
183 }
184
185 static int uinput_request_submit(struct uinput_device *udev,
186 struct uinput_request *request)
187 {
188 int retval;
189
190 retval = uinput_request_reserve_slot(udev, request);
191 if (retval)
192 return retval;
193
194 retval = uinput_request_send(udev, request);
195 if (retval)
196 goto out;
197
198 if (!wait_for_completion_timeout(&request->done, 30 * HZ)) {
199 retval = -ETIMEDOUT;
200 goto out;
201 }
202
203 retval = request->retval;
204
205 out:
206 uinput_request_release_slot(udev, request->id);
207 return retval;
208 }
209
210 /*
211 * Fail all outstanding requests so handlers don't wait for the userspace
212 * to finish processing them.
213 */
214 static void uinput_flush_requests(struct uinput_device *udev)
215 {
216 struct uinput_request *request;
217 int i;
218
219 spin_lock(&udev->requests_lock);
220
221 for (i = 0; i < UINPUT_NUM_REQUESTS; i++) {
222 request = udev->requests[i];
223 if (request) {
224 request->retval = -ENODEV;
225 complete(&request->done);
226 }
227 }
228
229 spin_unlock(&udev->requests_lock);
230 }
231
232 static void uinput_dev_set_gain(struct input_dev *dev, u16 gain)
233 {
234 uinput_dev_event(dev, EV_FF, FF_GAIN, gain);
235 }
236
237 static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude)
238 {
239 uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude);
240 }
241
242 static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value)
243 {
244 return uinput_dev_event(dev, EV_FF, effect_id, value);
245 }
246
247 static int uinput_dev_upload_effect(struct input_dev *dev,
248 struct ff_effect *effect,
249 struct ff_effect *old)
250 {
251 struct uinput_device *udev = input_get_drvdata(dev);
252 struct uinput_request request;
253
254 /*
255 * uinput driver does not currently support periodic effects with
256 * custom waveform since it does not have a way to pass buffer of
257 * samples (custom_data) to userspace. If ever there is a device
258 * supporting custom waveforms we would need to define an additional
259 * ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out.
260 */
261 if (effect->type == FF_PERIODIC &&
262 effect->u.periodic.waveform == FF_CUSTOM)
263 return -EINVAL;
264
265 request.code = UI_FF_UPLOAD;
266 request.u.upload.effect = effect;
267 request.u.upload.old = old;
268
269 return uinput_request_submit(udev, &request);
270 }
271
272 static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id)
273 {
274 struct uinput_device *udev = input_get_drvdata(dev);
275 struct uinput_request request;
276
277 if (!test_bit(EV_FF, dev->evbit))
278 return -ENOSYS;
279
280 request.code = UI_FF_ERASE;
281 request.u.effect_id = effect_id;
282
283 return uinput_request_submit(udev, &request);
284 }
285
286 static int uinput_dev_flush(struct input_dev *dev, struct file *file)
287 {
288 /*
289 * If we are called with file == NULL that means we are tearing
290 * down the device, and therefore we can not handle FF erase
291 * requests: either we are handling UI_DEV_DESTROY (and holding
292 * the udev->mutex), or the file descriptor is closed and there is
293 * nobody on the other side anymore.
294 */
295 return file ? input_ff_flush(dev, file) : 0;
296 }
297
298 static void uinput_destroy_device(struct uinput_device *udev)
299 {
300 const char *name, *phys;
301 struct input_dev *dev = udev->dev;
302 enum uinput_state old_state = udev->state;
303
304 udev->state = UIST_NEW_DEVICE;
305
306 if (dev) {
307 name = dev->name;
308 phys = dev->phys;
309 if (old_state == UIST_CREATED) {
310 uinput_flush_requests(udev);
311 input_unregister_device(dev);
312 } else {
313 input_free_device(dev);
314 }
315 kfree(name);
316 kfree(phys);
317 udev->dev = NULL;
318 }
319 }
320
321 static int uinput_create_device(struct uinput_device *udev)
322 {
323 struct input_dev *dev = udev->dev;
324 int error, nslot;
325
326 if (udev->state != UIST_SETUP_COMPLETE) {
327 printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
328 return -EINVAL;
329 }
330
331 if (test_bit(EV_ABS, dev->evbit)) {
332 input_alloc_absinfo(dev);
333 if (!dev->absinfo) {
334 error = -EINVAL;
335 goto fail1;
336 }
337
338 if (test_bit(ABS_MT_SLOT, dev->absbit)) {
339 nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1;
340 error = input_mt_init_slots(dev, nslot, 0);
341 if (error)
342 goto fail1;
343 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
344 input_set_events_per_packet(dev, 60);
345 }
346 }
347
348 if (test_bit(EV_FF, dev->evbit) && !udev->ff_effects_max) {
349 printk(KERN_DEBUG "%s: ff_effects_max should be non-zero when FF_BIT is set\n",
350 UINPUT_NAME);
351 error = -EINVAL;
352 goto fail1;
353 }
354
355 if (udev->ff_effects_max) {
356 error = input_ff_create(dev, udev->ff_effects_max);
357 if (error)
358 goto fail1;
359
360 dev->ff->upload = uinput_dev_upload_effect;
361 dev->ff->erase = uinput_dev_erase_effect;
362 dev->ff->playback = uinput_dev_playback;
363 dev->ff->set_gain = uinput_dev_set_gain;
364 dev->ff->set_autocenter = uinput_dev_set_autocenter;
365 /*
366 * The standard input_ff_flush() implementation does
367 * not quite work for uinput as we can't reasonably
368 * handle FF requests during device teardown.
369 */
370 dev->flush = uinput_dev_flush;
371 }
372
373 dev->event = uinput_dev_event;
374
375 input_set_drvdata(udev->dev, udev);
376
377 error = input_register_device(udev->dev);
378 if (error)
379 goto fail2;
380
381 udev->state = UIST_CREATED;
382
383 return 0;
384
385 fail2: input_ff_destroy(dev);
386 fail1: uinput_destroy_device(udev);
387 return error;
388 }
389
390 static int uinput_open(struct inode *inode, struct file *file)
391 {
392 struct uinput_device *newdev;
393
394 newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL);
395 if (!newdev)
396 return -ENOMEM;
397
398 mutex_init(&newdev->mutex);
399 spin_lock_init(&newdev->requests_lock);
400 init_waitqueue_head(&newdev->requests_waitq);
401 init_waitqueue_head(&newdev->waitq);
402 newdev->state = UIST_NEW_DEVICE;
403
404 file->private_data = newdev;
405 nonseekable_open(inode, file);
406
407 return 0;
408 }
409
410 static int uinput_validate_absinfo(struct input_dev *dev, unsigned int code,
411 const struct input_absinfo *abs)
412 {
413 int min, max, range;
414
415 min = abs->minimum;
416 max = abs->maximum;
417
418 if ((min != 0 || max != 0) && max < min) {
419 printk(KERN_DEBUG
420 "%s: invalid abs[%02x] min:%d max:%d\n",
421 UINPUT_NAME, code, min, max);
422 return -EINVAL;
423 }
424
425 if (!check_sub_overflow(max, min, &range) && abs->flat > range) {
426 printk(KERN_DEBUG
427 "%s: abs_flat #%02x out of range: %d (min:%d/max:%d)\n",
428 UINPUT_NAME, code, abs->flat, min, max);
429 return -EINVAL;
430 }
431
432 return 0;
433 }
434
435 static int uinput_validate_absbits(struct input_dev *dev)
436 {
437 unsigned int cnt;
438 int error;
439
440 if (!test_bit(EV_ABS, dev->evbit))
441 return 0;
442
443 /*
444 * Check if absmin/absmax/absfuzz/absflat are sane.
445 */
446
447 for_each_set_bit(cnt, dev->absbit, ABS_CNT) {
448 if (!dev->absinfo)
449 return -EINVAL;
450
451 error = uinput_validate_absinfo(dev, cnt, &dev->absinfo[cnt]);
452 if (error)
453 return error;
454 }
455
456 return 0;
457 }
458
459 static int uinput_dev_setup(struct uinput_device *udev,
460 struct uinput_setup __user *arg)
461 {
462 struct uinput_setup setup;
463 struct input_dev *dev;
464
465 if (udev->state == UIST_CREATED)
466 return -EINVAL;
467
468 if (copy_from_user(&setup, arg, sizeof(setup)))
469 return -EFAULT;
470
471 if (!setup.name[0])
472 return -EINVAL;
473
474 dev = udev->dev;
475 dev->id = setup.id;
476 udev->ff_effects_max = setup.ff_effects_max;
477
478 kfree(dev->name);
479 dev->name = kstrndup(setup.name, UINPUT_MAX_NAME_SIZE, GFP_KERNEL);
480 if (!dev->name)
481 return -ENOMEM;
482
483 udev->state = UIST_SETUP_COMPLETE;
484 return 0;
485 }
486
487 static int uinput_abs_setup(struct uinput_device *udev,
488 struct uinput_setup __user *arg, size_t size)
489 {
490 struct uinput_abs_setup setup = {};
491 struct input_dev *dev;
492 int error;
493
494 if (size > sizeof(setup))
495 return -E2BIG;
496
497 if (udev->state == UIST_CREATED)
498 return -EINVAL;
499
500 if (copy_from_user(&setup, arg, size))
501 return -EFAULT;
502
503 if (setup.code > ABS_MAX)
504 return -ERANGE;
505
506 dev = udev->dev;
507
508 error = uinput_validate_absinfo(dev, setup.code, &setup.absinfo);
509 if (error)
510 return error;
511
512 input_alloc_absinfo(dev);
513 if (!dev->absinfo)
514 return -ENOMEM;
515
516 set_bit(setup.code, dev->absbit);
517 dev->absinfo[setup.code] = setup.absinfo;
518 return 0;
519 }
520
521 /* legacy setup via write() */
522 static int uinput_setup_device_legacy(struct uinput_device *udev,
523 const char __user *buffer, size_t count)
524 {
525 struct uinput_user_dev *user_dev;
526 struct input_dev *dev;
527 int i;
528 int retval;
529
530 if (count != sizeof(struct uinput_user_dev))
531 return -EINVAL;
532
533 if (!udev->dev) {
534 udev->dev = input_allocate_device();
535 if (!udev->dev)
536 return -ENOMEM;
537 }
538
539 dev = udev->dev;
540
541 user_dev = memdup_user(buffer, sizeof(struct uinput_user_dev));
542 if (IS_ERR(user_dev))
543 return PTR_ERR(user_dev);
544
545 udev->ff_effects_max = user_dev->ff_effects_max;
546
547 /* Ensure name is filled in */
548 if (!user_dev->name[0]) {
549 retval = -EINVAL;
550 goto exit;
551 }
552
553 kfree(dev->name);
554 dev->name = kstrndup(user_dev->name, UINPUT_MAX_NAME_SIZE,
555 GFP_KERNEL);
556 if (!dev->name) {
557 retval = -ENOMEM;
558 goto exit;
559 }
560
561 dev->id.bustype = user_dev->id.bustype;
562 dev->id.vendor = user_dev->id.vendor;
563 dev->id.product = user_dev->id.product;
564 dev->id.version = user_dev->id.version;
565
566 for (i = 0; i < ABS_CNT; i++) {
567 input_abs_set_max(dev, i, user_dev->absmax[i]);
568 input_abs_set_min(dev, i, user_dev->absmin[i]);
569 input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]);
570 input_abs_set_flat(dev, i, user_dev->absflat[i]);
571 }
572
573 retval = uinput_validate_absbits(dev);
574 if (retval < 0)
575 goto exit;
576
577 udev->state = UIST_SETUP_COMPLETE;
578 retval = count;
579
580 exit:
581 kfree(user_dev);
582 return retval;
583 }
584
585 static ssize_t uinput_inject_events(struct uinput_device *udev,
586 const char __user *buffer, size_t count)
587 {
588 struct input_event ev;
589 size_t bytes = 0;
590
591 if (count != 0 && count < input_event_size())
592 return -EINVAL;
593
594 while (bytes + input_event_size() <= count) {
595 /*
596 * Note that even if some events were fetched successfully
597 * we are still going to return EFAULT instead of partial
598 * count to let userspace know that it got it's buffers
599 * all wrong.
600 */
601 if (input_event_from_user(buffer + bytes, &ev))
602 return -EFAULT;
603
604 input_event(udev->dev, ev.type, ev.code, ev.value);
605 bytes += input_event_size();
606 cond_resched();
607 }
608
609 return bytes;
610 }
611
612 static ssize_t uinput_write(struct file *file, const char __user *buffer,
613 size_t count, loff_t *ppos)
614 {
615 struct uinput_device *udev = file->private_data;
616 int retval;
617
618 if (count == 0)
619 return 0;
620
621 retval = mutex_lock_interruptible(&udev->mutex);
622 if (retval)
623 return retval;
624
625 retval = udev->state == UIST_CREATED ?
626 uinput_inject_events(udev, buffer, count) :
627 uinput_setup_device_legacy(udev, buffer, count);
628
629 mutex_unlock(&udev->mutex);
630
631 return retval;
632 }
633
634 static bool uinput_fetch_next_event(struct uinput_device *udev,
635 struct input_event *event)
636 {
637 bool have_event;
638
639 spin_lock_irq(&udev->dev->event_lock);
640
641 have_event = udev->head != udev->tail;
642 if (have_event) {
643 *event = udev->buff[udev->tail];
644 udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
645 }
646
647 spin_unlock_irq(&udev->dev->event_lock);
648
649 return have_event;
650 }
651
652 static ssize_t uinput_events_to_user(struct uinput_device *udev,
653 char __user *buffer, size_t count)
654 {
655 struct input_event event;
656 size_t read = 0;
657
658 while (read + input_event_size() <= count &&
659 uinput_fetch_next_event(udev, &event)) {
660
661 if (input_event_to_user(buffer + read, &event))
662 return -EFAULT;
663
664 read += input_event_size();
665 }
666
667 return read;
668 }
669
670 static ssize_t uinput_read(struct file *file, char __user *buffer,
671 size_t count, loff_t *ppos)
672 {
673 struct uinput_device *udev = file->private_data;
674 ssize_t retval;
675
676 if (count != 0 && count < input_event_size())
677 return -EINVAL;
678
679 do {
680 retval = mutex_lock_interruptible(&udev->mutex);
681 if (retval)
682 return retval;
683
684 if (udev->state != UIST_CREATED)
685 retval = -ENODEV;
686 else if (udev->head == udev->tail &&
687 (file->f_flags & O_NONBLOCK))
688 retval = -EAGAIN;
689 else
690 retval = uinput_events_to_user(udev, buffer, count);
691
692 mutex_unlock(&udev->mutex);
693
694 if (retval || count == 0)
695 break;
696
697 if (!(file->f_flags & O_NONBLOCK))
698 retval = wait_event_interruptible(udev->waitq,
699 udev->head != udev->tail ||
700 udev->state != UIST_CREATED);
701 } while (retval == 0);
702
703 return retval;
704 }
705
706 static __poll_t uinput_poll(struct file *file, poll_table *wait)
707 {
708 struct uinput_device *udev = file->private_data;
709
710 poll_wait(file, &udev->waitq, wait);
711
712 if (udev->head != udev->tail)
713 return EPOLLIN | EPOLLRDNORM;
714
715 return 0;
716 }
717
718 static int uinput_release(struct inode *inode, struct file *file)
719 {
720 struct uinput_device *udev = file->private_data;
721
722 uinput_destroy_device(udev);
723 kfree(udev);
724
725 return 0;
726 }
727
728 #ifdef CONFIG_COMPAT
729 struct uinput_ff_upload_compat {
730 __u32 request_id;
731 __s32 retval;
732 struct ff_effect_compat effect;
733 struct ff_effect_compat old;
734 };
735
736 static int uinput_ff_upload_to_user(char __user *buffer,
737 const struct uinput_ff_upload *ff_up)
738 {
739 if (in_compat_syscall()) {
740 struct uinput_ff_upload_compat ff_up_compat;
741
742 ff_up_compat.request_id = ff_up->request_id;
743 ff_up_compat.retval = ff_up->retval;
744 /*
745 * It so happens that the pointer that gives us the trouble
746 * is the last field in the structure. Since we don't support
747 * custom waveforms in uinput anyway we can just copy the whole
748 * thing (to the compat size) and ignore the pointer.
749 */
750 memcpy(&ff_up_compat.effect, &ff_up->effect,
751 sizeof(struct ff_effect_compat));
752 memcpy(&ff_up_compat.old, &ff_up->old,
753 sizeof(struct ff_effect_compat));
754
755 if (copy_to_user(buffer, &ff_up_compat,
756 sizeof(struct uinput_ff_upload_compat)))
757 return -EFAULT;
758 } else {
759 if (copy_to_user(buffer, ff_up,
760 sizeof(struct uinput_ff_upload)))
761 return -EFAULT;
762 }
763
764 return 0;
765 }
766
767 static int uinput_ff_upload_from_user(const char __user *buffer,
768 struct uinput_ff_upload *ff_up)
769 {
770 if (in_compat_syscall()) {
771 struct uinput_ff_upload_compat ff_up_compat;
772
773 if (copy_from_user(&ff_up_compat, buffer,
774 sizeof(struct uinput_ff_upload_compat)))
775 return -EFAULT;
776
777 ff_up->request_id = ff_up_compat.request_id;
778 ff_up->retval = ff_up_compat.retval;
779 memcpy(&ff_up->effect, &ff_up_compat.effect,
780 sizeof(struct ff_effect_compat));
781 memcpy(&ff_up->old, &ff_up_compat.old,
782 sizeof(struct ff_effect_compat));
783
784 } else {
785 if (copy_from_user(ff_up, buffer,
786 sizeof(struct uinput_ff_upload)))
787 return -EFAULT;
788 }
789
790 return 0;
791 }
792
793 #else
794
795 static int uinput_ff_upload_to_user(char __user *buffer,
796 const struct uinput_ff_upload *ff_up)
797 {
798 if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload)))
799 return -EFAULT;
800
801 return 0;
802 }
803
804 static int uinput_ff_upload_from_user(const char __user *buffer,
805 struct uinput_ff_upload *ff_up)
806 {
807 if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload)))
808 return -EFAULT;
809
810 return 0;
811 }
812
813 #endif
814
815 #define uinput_set_bit(_arg, _bit, _max) \
816 ({ \
817 int __ret = 0; \
818 if (udev->state == UIST_CREATED) \
819 __ret = -EINVAL; \
820 else if ((_arg) > (_max)) \
821 __ret = -EINVAL; \
822 else set_bit((_arg), udev->dev->_bit); \
823 __ret; \
824 })
825
826 static int uinput_str_to_user(void __user *dest, const char *str,
827 unsigned int maxlen)
828 {
829 char __user *p = dest;
830 int len, ret;
831
832 if (!str)
833 return -ENOENT;
834
835 if (maxlen == 0)
836 return -EINVAL;
837
838 len = strlen(str) + 1;
839 if (len > maxlen)
840 len = maxlen;
841
842 ret = copy_to_user(p, str, len);
843 if (ret)
844 return -EFAULT;
845
846 /* force terminating '\0' */
847 ret = put_user(0, p + len - 1);
848 return ret ? -EFAULT : len;
849 }
850
851 static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
852 unsigned long arg, void __user *p)
853 {
854 int retval;
855 struct uinput_device *udev = file->private_data;
856 struct uinput_ff_upload ff_up;
857 struct uinput_ff_erase ff_erase;
858 struct uinput_request *req;
859 char *phys;
860 const char *name;
861 unsigned int size;
862
863 retval = mutex_lock_interruptible(&udev->mutex);
864 if (retval)
865 return retval;
866
867 if (!udev->dev) {
868 udev->dev = input_allocate_device();
869 if (!udev->dev) {
870 retval = -ENOMEM;
871 goto out;
872 }
873 }
874
875 switch (cmd) {
876 case UI_GET_VERSION:
877 if (put_user(UINPUT_VERSION, (unsigned int __user *)p))
878 retval = -EFAULT;
879 goto out;
880
881 case UI_DEV_CREATE:
882 retval = uinput_create_device(udev);
883 goto out;
884
885 case UI_DEV_DESTROY:
886 uinput_destroy_device(udev);
887 goto out;
888
889 case UI_DEV_SETUP:
890 retval = uinput_dev_setup(udev, p);
891 goto out;
892
893 /* UI_ABS_SETUP is handled in the variable size ioctls */
894
895 case UI_SET_EVBIT:
896 retval = uinput_set_bit(arg, evbit, EV_MAX);
897 goto out;
898
899 case UI_SET_KEYBIT:
900 retval = uinput_set_bit(arg, keybit, KEY_MAX);
901 goto out;
902
903 case UI_SET_RELBIT:
904 retval = uinput_set_bit(arg, relbit, REL_MAX);
905 goto out;
906
907 case UI_SET_ABSBIT:
908 retval = uinput_set_bit(arg, absbit, ABS_MAX);
909 goto out;
910
911 case UI_SET_MSCBIT:
912 retval = uinput_set_bit(arg, mscbit, MSC_MAX);
913 goto out;
914
915 case UI_SET_LEDBIT:
916 retval = uinput_set_bit(arg, ledbit, LED_MAX);
917 goto out;
918
919 case UI_SET_SNDBIT:
920 retval = uinput_set_bit(arg, sndbit, SND_MAX);
921 goto out;
922
923 case UI_SET_FFBIT:
924 retval = uinput_set_bit(arg, ffbit, FF_MAX);
925 goto out;
926
927 case UI_SET_SWBIT:
928 retval = uinput_set_bit(arg, swbit, SW_MAX);
929 goto out;
930
931 case UI_SET_PROPBIT:
932 retval = uinput_set_bit(arg, propbit, INPUT_PROP_MAX);
933 goto out;
934
935 case UI_SET_PHYS:
936 if (udev->state == UIST_CREATED) {
937 retval = -EINVAL;
938 goto out;
939 }
940
941 phys = strndup_user(p, 1024);
942 if (IS_ERR(phys)) {
943 retval = PTR_ERR(phys);
944 goto out;
945 }
946
947 kfree(udev->dev->phys);
948 udev->dev->phys = phys;
949 goto out;
950
951 case UI_BEGIN_FF_UPLOAD:
952 retval = uinput_ff_upload_from_user(p, &ff_up);
953 if (retval)
954 goto out;
955
956 req = uinput_request_find(udev, ff_up.request_id);
957 if (!req || req->code != UI_FF_UPLOAD ||
958 !req->u.upload.effect) {
959 retval = -EINVAL;
960 goto out;
961 }
962
963 ff_up.retval = 0;
964 ff_up.effect = *req->u.upload.effect;
965 if (req->u.upload.old)
966 ff_up.old = *req->u.upload.old;
967 else
968 memset(&ff_up.old, 0, sizeof(struct ff_effect));
969
970 retval = uinput_ff_upload_to_user(p, &ff_up);
971 goto out;
972
973 case UI_BEGIN_FF_ERASE:
974 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
975 retval = -EFAULT;
976 goto out;
977 }
978
979 req = uinput_request_find(udev, ff_erase.request_id);
980 if (!req || req->code != UI_FF_ERASE) {
981 retval = -EINVAL;
982 goto out;
983 }
984
985 ff_erase.retval = 0;
986 ff_erase.effect_id = req->u.effect_id;
987 if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
988 retval = -EFAULT;
989 goto out;
990 }
991
992 goto out;
993
994 case UI_END_FF_UPLOAD:
995 retval = uinput_ff_upload_from_user(p, &ff_up);
996 if (retval)
997 goto out;
998
999 req = uinput_request_find(udev, ff_up.request_id);
1000 if (!req || req->code != UI_FF_UPLOAD ||
1001 !req->u.upload.effect) {
1002 retval = -EINVAL;
1003 goto out;
1004 }
1005
1006 req->retval = ff_up.retval;
1007 complete(&req->done);
1008 goto out;
1009
1010 case UI_END_FF_ERASE:
1011 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
1012 retval = -EFAULT;
1013 goto out;
1014 }
1015
1016 req = uinput_request_find(udev, ff_erase.request_id);
1017 if (!req || req->code != UI_FF_ERASE) {
1018 retval = -EINVAL;
1019 goto out;
1020 }
1021
1022 req->retval = ff_erase.retval;
1023 complete(&req->done);
1024 goto out;
1025 }
1026
1027 size = _IOC_SIZE(cmd);
1028
1029 /* Now check variable-length commands */
1030 switch (cmd & ~IOCSIZE_MASK) {
1031 case UI_GET_SYSNAME(0):
1032 if (udev->state != UIST_CREATED) {
1033 retval = -ENOENT;
1034 goto out;
1035 }
1036 name = dev_name(&udev->dev->dev);
1037 retval = uinput_str_to_user(p, name, size);
1038 goto out;
1039
1040 case UI_ABS_SETUP & ~IOCSIZE_MASK:
1041 retval = uinput_abs_setup(udev, p, size);
1042 goto out;
1043 }
1044
1045 retval = -EINVAL;
1046 out:
1047 mutex_unlock(&udev->mutex);
1048 return retval;
1049 }
1050
1051 static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1052 {
1053 return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg);
1054 }
1055
1056 #ifdef CONFIG_COMPAT
1057
1058 /*
1059 * These IOCTLs change their size and thus their numbers between
1060 * 32 and 64 bits.
1061 */
1062 #define UI_SET_PHYS_COMPAT \
1063 _IOW(UINPUT_IOCTL_BASE, 108, compat_uptr_t)
1064 #define UI_BEGIN_FF_UPLOAD_COMPAT \
1065 _IOWR(UINPUT_IOCTL_BASE, 200, struct uinput_ff_upload_compat)
1066 #define UI_END_FF_UPLOAD_COMPAT \
1067 _IOW(UINPUT_IOCTL_BASE, 201, struct uinput_ff_upload_compat)
1068
1069 static long uinput_compat_ioctl(struct file *file,
1070 unsigned int cmd, unsigned long arg)
1071 {
1072 switch (cmd) {
1073 case UI_SET_PHYS_COMPAT:
1074 cmd = UI_SET_PHYS;
1075 break;
1076 case UI_BEGIN_FF_UPLOAD_COMPAT:
1077 cmd = UI_BEGIN_FF_UPLOAD;
1078 break;
1079 case UI_END_FF_UPLOAD_COMPAT:
1080 cmd = UI_END_FF_UPLOAD;
1081 break;
1082 }
1083
1084 return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg));
1085 }
1086 #endif
1087
1088 static const struct file_operations uinput_fops = {
1089 .owner = THIS_MODULE,
1090 .open = uinput_open,
1091 .release = uinput_release,
1092 .read = uinput_read,
1093 .write = uinput_write,
1094 .poll = uinput_poll,
1095 .unlocked_ioctl = uinput_ioctl,
1096 #ifdef CONFIG_COMPAT
1097 .compat_ioctl = uinput_compat_ioctl,
1098 #endif
1099 .llseek = no_llseek,
1100 };
1101
1102 static struct miscdevice uinput_misc = {
1103 .fops = &uinput_fops,
1104 .minor = UINPUT_MINOR,
1105 .name = UINPUT_NAME,
1106 };
1107 module_misc_device(uinput_misc);
1108
1109 MODULE_ALIAS_MISCDEV(UINPUT_MINOR);
1110 MODULE_ALIAS("devname:" UINPUT_NAME);
1111
1112 MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
1113 MODULE_DESCRIPTION("User level driver support for input subsystem");
1114 MODULE_LICENSE("GPL");
Linux with added FPC-III support