This source file includes following definitions.
- evdev_get_mask_cnt
- __evdev_is_filtered
- __evdev_flush_queue
- __evdev_queue_syn_dropped
- evdev_queue_syn_dropped
- evdev_set_clk_type
- __pass_event
- evdev_pass_values
- evdev_events
- evdev_event
- evdev_fasync
- evdev_free
- evdev_grab
- evdev_ungrab
- evdev_attach_client
- evdev_detach_client
- evdev_open_device
- evdev_close_device
- evdev_hangup
- evdev_release
- evdev_compute_buffer_size
- evdev_open
- evdev_write
- evdev_fetch_next_event
- evdev_read
- evdev_poll
- bits_to_user
- bits_from_user
- bits_to_user
- bits_from_user
- bits_to_user
- bits_from_user
- str_to_user
- handle_eviocgbit
- evdev_handle_get_keycode
- evdev_handle_get_keycode_v2
- evdev_handle_set_keycode
- evdev_handle_set_keycode_v2
- evdev_handle_get_val
- evdev_handle_mt_request
- evdev_revoke
- evdev_set_mask
- evdev_get_mask
- evdev_do_ioctl
- evdev_ioctl_handler
- evdev_ioctl
- evdev_ioctl_compat
- evdev_mark_dead
- evdev_cleanup
- evdev_connect
- evdev_disconnect
- evdev_init
- evdev_exit
1
2
3
4
5
6
7
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10 #define EVDEV_MINOR_BASE 64
11 #define EVDEV_MINORS 32
12 #define EVDEV_MIN_BUFFER_SIZE 64U
13 #define EVDEV_BUF_PACKETS 8
14
15 #include <linux/poll.h>
16 #include <linux/sched.h>
17 #include <linux/slab.h>
18 #include <linux/vmalloc.h>
19 #include <linux/mm.h>
20 #include <linux/module.h>
21 #include <linux/init.h>
22 #include <linux/input/mt.h>
23 #include <linux/major.h>
24 #include <linux/device.h>
25 #include <linux/cdev.h>
26 #include "input-compat.h"
27
28 struct evdev {
29 int open;
30 struct input_handle handle;
31 wait_queue_head_t wait;
32 struct evdev_client __rcu *grab;
33 struct list_head client_list;
34 spinlock_t client_lock;
35 struct mutex mutex;
36 struct device dev;
37 struct cdev cdev;
38 bool exist;
39 };
40
41 struct evdev_client {
42 unsigned int head;
43 unsigned int tail;
44 unsigned int packet_head;
45 spinlock_t buffer_lock;
46 struct fasync_struct *fasync;
47 struct evdev *evdev;
48 struct list_head node;
49 enum input_clock_type clk_type;
50 bool revoked;
51 unsigned long *evmasks[EV_CNT];
52 unsigned int bufsize;
53 struct input_event buffer[];
54 };
55
56 static size_t evdev_get_mask_cnt(unsigned int type)
57 {
58 static const size_t counts[EV_CNT] = {
59
60 [EV_SYN] = EV_CNT,
61 [EV_KEY] = KEY_CNT,
62 [EV_REL] = REL_CNT,
63 [EV_ABS] = ABS_CNT,
64 [EV_MSC] = MSC_CNT,
65 [EV_SW] = SW_CNT,
66 [EV_LED] = LED_CNT,
67 [EV_SND] = SND_CNT,
68 [EV_FF] = FF_CNT,
69 };
70
71 return (type < EV_CNT) ? counts[type] : 0;
72 }
73
74
75 static bool __evdev_is_filtered(struct evdev_client *client,
76 unsigned int type,
77 unsigned int code)
78 {
79 unsigned long *mask;
80 size_t cnt;
81
82
83 if (type == EV_SYN || type >= EV_CNT)
84 return false;
85
86
87 mask = client->evmasks[0];
88 if (mask && !test_bit(type, mask))
89 return true;
90
91
92 cnt = evdev_get_mask_cnt(type);
93 if (!cnt || code >= cnt)
94 return false;
95
96 mask = client->evmasks[type];
97 return mask && !test_bit(code, mask);
98 }
99
100
101 static void __evdev_flush_queue(struct evdev_client *client, unsigned int type)
102 {
103 unsigned int i, head, num;
104 unsigned int mask = client->bufsize - 1;
105 bool is_report;
106 struct input_event *ev;
107
108 BUG_ON(type == EV_SYN);
109
110 head = client->tail;
111 client->packet_head = client->tail;
112
113
114 num = 1;
115
116 for (i = client->tail; i != client->head; i = (i + 1) & mask) {
117 ev = &client->buffer[i];
118 is_report = ev->type == EV_SYN && ev->code == SYN_REPORT;
119
120 if (ev->type == type) {
121
122 continue;
123 } else if (is_report && !num) {
124
125 continue;
126 } else if (head != i) {
127
128 client->buffer[head] = *ev;
129 }
130
131 num++;
132 head = (head + 1) & mask;
133
134 if (is_report) {
135 num = 0;
136 client->packet_head = head;
137 }
138 }
139
140 client->head = head;
141 }
142
143 static void __evdev_queue_syn_dropped(struct evdev_client *client)
144 {
145 ktime_t *ev_time = input_get_timestamp(client->evdev->handle.dev);
146 struct timespec64 ts = ktime_to_timespec64(ev_time[client->clk_type]);
147 struct input_event ev;
148
149 ev.input_event_sec = ts.tv_sec;
150 ev.input_event_usec = ts.tv_nsec / NSEC_PER_USEC;
151 ev.type = EV_SYN;
152 ev.code = SYN_DROPPED;
153 ev.value = 0;
154
155 client->buffer[client->head++] = ev;
156 client->head &= client->bufsize - 1;
157
158 if (unlikely(client->head == client->tail)) {
159
160 client->tail = (client->head - 1) & (client->bufsize - 1);
161 client->packet_head = client->tail;
162 }
163 }
164
165 static void evdev_queue_syn_dropped(struct evdev_client *client)
166 {
167 unsigned long flags;
168
169 spin_lock_irqsave(&client->buffer_lock, flags);
170 __evdev_queue_syn_dropped(client);
171 spin_unlock_irqrestore(&client->buffer_lock, flags);
172 }
173
174 static int evdev_set_clk_type(struct evdev_client *client, unsigned int clkid)
175 {
176 unsigned long flags;
177 enum input_clock_type clk_type;
178
179 switch (clkid) {
180
181 case CLOCK_REALTIME:
182 clk_type = INPUT_CLK_REAL;
183 break;
184 case CLOCK_MONOTONIC:
185 clk_type = INPUT_CLK_MONO;
186 break;
187 case CLOCK_BOOTTIME:
188 clk_type = INPUT_CLK_BOOT;
189 break;
190 default:
191 return -EINVAL;
192 }
193
194 if (client->clk_type != clk_type) {
195 client->clk_type = clk_type;
196
197
198
199
200
201 spin_lock_irqsave(&client->buffer_lock, flags);
202
203 if (client->head != client->tail) {
204 client->packet_head = client->head = client->tail;
205 __evdev_queue_syn_dropped(client);
206 }
207
208 spin_unlock_irqrestore(&client->buffer_lock, flags);
209 }
210
211 return 0;
212 }
213
214 static void __pass_event(struct evdev_client *client,
215 const struct input_event *event)
216 {
217 client->buffer[client->head++] = *event;
218 client->head &= client->bufsize - 1;
219
220 if (unlikely(client->head == client->tail)) {
221
222
223
224
225 client->tail = (client->head - 2) & (client->bufsize - 1);
226
227 client->buffer[client->tail] = (struct input_event) {
228 .input_event_sec = event->input_event_sec,
229 .input_event_usec = event->input_event_usec,
230 .type = EV_SYN,
231 .code = SYN_DROPPED,
232 .value = 0,
233 };
234
235 client->packet_head = client->tail;
236 }
237
238 if (event->type == EV_SYN && event->code == SYN_REPORT) {
239 client->packet_head = client->head;
240 kill_fasync(&client->fasync, SIGIO, POLL_IN);
241 }
242 }
243
244 static void evdev_pass_values(struct evdev_client *client,
245 const struct input_value *vals, unsigned int count,
246 ktime_t *ev_time)
247 {
248 struct evdev *evdev = client->evdev;
249 const struct input_value *v;
250 struct input_event event;
251 struct timespec64 ts;
252 bool wakeup = false;
253
254 if (client->revoked)
255 return;
256
257 ts = ktime_to_timespec64(ev_time[client->clk_type]);
258 event.input_event_sec = ts.tv_sec;
259 event.input_event_usec = ts.tv_nsec / NSEC_PER_USEC;
260
261
262 spin_lock(&client->buffer_lock);
263
264 for (v = vals; v != vals + count; v++) {
265 if (__evdev_is_filtered(client, v->type, v->code))
266 continue;
267
268 if (v->type == EV_SYN && v->code == SYN_REPORT) {
269
270 if (client->packet_head == client->head)
271 continue;
272
273 wakeup = true;
274 }
275
276 event.type = v->type;
277 event.code = v->code;
278 event.value = v->value;
279 __pass_event(client, &event);
280 }
281
282 spin_unlock(&client->buffer_lock);
283
284 if (wakeup)
285 wake_up_interruptible(&evdev->wait);
286 }
287
288
289
290
291 static void evdev_events(struct input_handle *handle,
292 const struct input_value *vals, unsigned int count)
293 {
294 struct evdev *evdev = handle->private;
295 struct evdev_client *client;
296 ktime_t *ev_time = input_get_timestamp(handle->dev);
297
298 rcu_read_lock();
299
300 client = rcu_dereference(evdev->grab);
301
302 if (client)
303 evdev_pass_values(client, vals, count, ev_time);
304 else
305 list_for_each_entry_rcu(client, &evdev->client_list, node)
306 evdev_pass_values(client, vals, count, ev_time);
307
308 rcu_read_unlock();
309 }
310
311
312
313
314 static void evdev_event(struct input_handle *handle,
315 unsigned int type, unsigned int code, int value)
316 {
317 struct input_value vals[] = { { type, code, value } };
318
319 evdev_events(handle, vals, 1);
320 }
321
322 static int evdev_fasync(int fd, struct file *file, int on)
323 {
324 struct evdev_client *client = file->private_data;
325
326 return fasync_helper(fd, file, on, &client->fasync);
327 }
328
329 static void evdev_free(struct device *dev)
330 {
331 struct evdev *evdev = container_of(dev, struct evdev, dev);
332
333 input_put_device(evdev->handle.dev);
334 kfree(evdev);
335 }
336
337
338
339
340
341 static int evdev_grab(struct evdev *evdev, struct evdev_client *client)
342 {
343 int error;
344
345 if (evdev->grab)
346 return -EBUSY;
347
348 error = input_grab_device(&evdev->handle);
349 if (error)
350 return error;
351
352 rcu_assign_pointer(evdev->grab, client);
353
354 return 0;
355 }
356
357 static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client)
358 {
359 struct evdev_client *grab = rcu_dereference_protected(evdev->grab,
360 lockdep_is_held(&evdev->mutex));
361
362 if (grab != client)
363 return -EINVAL;
364
365 rcu_assign_pointer(evdev->grab, NULL);
366 synchronize_rcu();
367 input_release_device(&evdev->handle);
368
369 return 0;
370 }
371
372 static void evdev_attach_client(struct evdev *evdev,
373 struct evdev_client *client)
374 {
375 spin_lock(&evdev->client_lock);
376 list_add_tail_rcu(&client->node, &evdev->client_list);
377 spin_unlock(&evdev->client_lock);
378 }
379
380 static void evdev_detach_client(struct evdev *evdev,
381 struct evdev_client *client)
382 {
383 spin_lock(&evdev->client_lock);
384 list_del_rcu(&client->node);
385 spin_unlock(&evdev->client_lock);
386 synchronize_rcu();
387 }
388
389 static int evdev_open_device(struct evdev *evdev)
390 {
391 int retval;
392
393 retval = mutex_lock_interruptible(&evdev->mutex);
394 if (retval)
395 return retval;
396
397 if (!evdev->exist)
398 retval = -ENODEV;
399 else if (!evdev->open++) {
400 retval = input_open_device(&evdev->handle);
401 if (retval)
402 evdev->open--;
403 }
404
405 mutex_unlock(&evdev->mutex);
406 return retval;
407 }
408
409 static void evdev_close_device(struct evdev *evdev)
410 {
411 mutex_lock(&evdev->mutex);
412
413 if (evdev->exist && !--evdev->open)
414 input_close_device(&evdev->handle);
415
416 mutex_unlock(&evdev->mutex);
417 }
418
419
420
421
422
423 static void evdev_hangup(struct evdev *evdev)
424 {
425 struct evdev_client *client;
426
427 spin_lock(&evdev->client_lock);
428 list_for_each_entry(client, &evdev->client_list, node)
429 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
430 spin_unlock(&evdev->client_lock);
431
432 wake_up_interruptible(&evdev->wait);
433 }
434
435 static int evdev_release(struct inode *inode, struct file *file)
436 {
437 struct evdev_client *client = file->private_data;
438 struct evdev *evdev = client->evdev;
439 unsigned int i;
440
441 mutex_lock(&evdev->mutex);
442
443 if (evdev->exist && !client->revoked)
444 input_flush_device(&evdev->handle, file);
445
446 evdev_ungrab(evdev, client);
447 mutex_unlock(&evdev->mutex);
448
449 evdev_detach_client(evdev, client);
450
451 for (i = 0; i < EV_CNT; ++i)
452 bitmap_free(client->evmasks[i]);
453
454 kvfree(client);
455
456 evdev_close_device(evdev);
457
458 return 0;
459 }
460
461 static unsigned int evdev_compute_buffer_size(struct input_dev *dev)
462 {
463 unsigned int n_events =
464 max(dev->hint_events_per_packet * EVDEV_BUF_PACKETS,
465 EVDEV_MIN_BUFFER_SIZE);
466
467 return roundup_pow_of_two(n_events);
468 }
469
470 static int evdev_open(struct inode *inode, struct file *file)
471 {
472 struct evdev *evdev = container_of(inode->i_cdev, struct evdev, cdev);
473 unsigned int bufsize = evdev_compute_buffer_size(evdev->handle.dev);
474 struct evdev_client *client;
475 int error;
476
477 client = kvzalloc(struct_size(client, buffer, bufsize), GFP_KERNEL);
478 if (!client)
479 return -ENOMEM;
480
481 client->bufsize = bufsize;
482 spin_lock_init(&client->buffer_lock);
483 client->evdev = evdev;
484 evdev_attach_client(evdev, client);
485
486 error = evdev_open_device(evdev);
487 if (error)
488 goto err_free_client;
489
490 file->private_data = client;
491 stream_open(inode, file);
492
493 return 0;
494
495 err_free_client:
496 evdev_detach_client(evdev, client);
497 kvfree(client);
498 return error;
499 }
500
501 static ssize_t evdev_write(struct file *file, const char __user *buffer,
502 size_t count, loff_t *ppos)
503 {
504 struct evdev_client *client = file->private_data;
505 struct evdev *evdev = client->evdev;
506 struct input_event event;
507 int retval = 0;
508
509 if (count != 0 && count < input_event_size())
510 return -EINVAL;
511
512 retval = mutex_lock_interruptible(&evdev->mutex);
513 if (retval)
514 return retval;
515
516 if (!evdev->exist || client->revoked) {
517 retval = -ENODEV;
518 goto out;
519 }
520
521 while (retval + input_event_size() <= count) {
522
523 if (input_event_from_user(buffer + retval, &event)) {
524 retval = -EFAULT;
525 goto out;
526 }
527 retval += input_event_size();
528
529 input_inject_event(&evdev->handle,
530 event.type, event.code, event.value);
531 cond_resched();
532 }
533
534 out:
535 mutex_unlock(&evdev->mutex);
536 return retval;
537 }
538
539 static int evdev_fetch_next_event(struct evdev_client *client,
540 struct input_event *event)
541 {
542 int have_event;
543
544 spin_lock_irq(&client->buffer_lock);
545
546 have_event = client->packet_head != client->tail;
547 if (have_event) {
548 *event = client->buffer[client->tail++];
549 client->tail &= client->bufsize - 1;
550 }
551
552 spin_unlock_irq(&client->buffer_lock);
553
554 return have_event;
555 }
556
557 static ssize_t evdev_read(struct file *file, char __user *buffer,
558 size_t count, loff_t *ppos)
559 {
560 struct evdev_client *client = file->private_data;
561 struct evdev *evdev = client->evdev;
562 struct input_event event;
563 size_t read = 0;
564 int error;
565
566 if (count != 0 && count < input_event_size())
567 return -EINVAL;
568
569 for (;;) {
570 if (!evdev->exist || client->revoked)
571 return -ENODEV;
572
573 if (client->packet_head == client->tail &&
574 (file->f_flags & O_NONBLOCK))
575 return -EAGAIN;
576
577
578
579
580
581 if (count == 0)
582 break;
583
584 while (read + input_event_size() <= count &&
585 evdev_fetch_next_event(client, &event)) {
586
587 if (input_event_to_user(buffer + read, &event))
588 return -EFAULT;
589
590 read += input_event_size();
591 }
592
593 if (read)
594 break;
595
596 if (!(file->f_flags & O_NONBLOCK)) {
597 error = wait_event_interruptible(evdev->wait,
598 client->packet_head != client->tail ||
599 !evdev->exist || client->revoked);
600 if (error)
601 return error;
602 }
603 }
604
605 return read;
606 }
607
608
609 static __poll_t evdev_poll(struct file *file, poll_table *wait)
610 {
611 struct evdev_client *client = file->private_data;
612 struct evdev *evdev = client->evdev;
613 __poll_t mask;
614
615 poll_wait(file, &evdev->wait, wait);
616
617 if (evdev->exist && !client->revoked)
618 mask = EPOLLOUT | EPOLLWRNORM;
619 else
620 mask = EPOLLHUP | EPOLLERR;
621
622 if (client->packet_head != client->tail)
623 mask |= EPOLLIN | EPOLLRDNORM;
624
625 return mask;
626 }
627
628 #ifdef CONFIG_COMPAT
629
630 #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
631 #define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1)
632
633 #ifdef __BIG_ENDIAN
634 static int bits_to_user(unsigned long *bits, unsigned int maxbit,
635 unsigned int maxlen, void __user *p, int compat)
636 {
637 int len, i;
638
639 if (compat) {
640 len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t);
641 if (len > maxlen)
642 len = maxlen;
643
644 for (i = 0; i < len / sizeof(compat_long_t); i++)
645 if (copy_to_user((compat_long_t __user *) p + i,
646 (compat_long_t *) bits +
647 i + 1 - ((i % 2) << 1),
648 sizeof(compat_long_t)))
649 return -EFAULT;
650 } else {
651 len = BITS_TO_LONGS(maxbit) * sizeof(long);
652 if (len > maxlen)
653 len = maxlen;
654
655 if (copy_to_user(p, bits, len))
656 return -EFAULT;
657 }
658
659 return len;
660 }
661
662 static int bits_from_user(unsigned long *bits, unsigned int maxbit,
663 unsigned int maxlen, const void __user *p, int compat)
664 {
665 int len, i;
666
667 if (compat) {
668 if (maxlen % sizeof(compat_long_t))
669 return -EINVAL;
670
671 len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t);
672 if (len > maxlen)
673 len = maxlen;
674
675 for (i = 0; i < len / sizeof(compat_long_t); i++)
676 if (copy_from_user((compat_long_t *) bits +
677 i + 1 - ((i % 2) << 1),
678 (compat_long_t __user *) p + i,
679 sizeof(compat_long_t)))
680 return -EFAULT;
681 if (i % 2)
682 *((compat_long_t *) bits + i - 1) = 0;
683
684 } else {
685 if (maxlen % sizeof(long))
686 return -EINVAL;
687
688 len = BITS_TO_LONGS(maxbit) * sizeof(long);
689 if (len > maxlen)
690 len = maxlen;
691
692 if (copy_from_user(bits, p, len))
693 return -EFAULT;
694 }
695
696 return len;
697 }
698
699 #else
700
701 static int bits_to_user(unsigned long *bits, unsigned int maxbit,
702 unsigned int maxlen, void __user *p, int compat)
703 {
704 int len = compat ?
705 BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) :
706 BITS_TO_LONGS(maxbit) * sizeof(long);
707
708 if (len > maxlen)
709 len = maxlen;
710
711 return copy_to_user(p, bits, len) ? -EFAULT : len;
712 }
713
714 static int bits_from_user(unsigned long *bits, unsigned int maxbit,
715 unsigned int maxlen, const void __user *p, int compat)
716 {
717 size_t chunk_size = compat ? sizeof(compat_long_t) : sizeof(long);
718 int len;
719
720 if (maxlen % chunk_size)
721 return -EINVAL;
722
723 len = compat ? BITS_TO_LONGS_COMPAT(maxbit) : BITS_TO_LONGS(maxbit);
724 len *= chunk_size;
725 if (len > maxlen)
726 len = maxlen;
727
728 return copy_from_user(bits, p, len) ? -EFAULT : len;
729 }
730
731 #endif
732
733 #else
734
735 static int bits_to_user(unsigned long *bits, unsigned int maxbit,
736 unsigned int maxlen, void __user *p, int compat)
737 {
738 int len = BITS_TO_LONGS(maxbit) * sizeof(long);
739
740 if (len > maxlen)
741 len = maxlen;
742
743 return copy_to_user(p, bits, len) ? -EFAULT : len;
744 }
745
746 static int bits_from_user(unsigned long *bits, unsigned int maxbit,
747 unsigned int maxlen, const void __user *p, int compat)
748 {
749 int len;
750
751 if (maxlen % sizeof(long))
752 return -EINVAL;
753
754 len = BITS_TO_LONGS(maxbit) * sizeof(long);
755 if (len > maxlen)
756 len = maxlen;
757
758 return copy_from_user(bits, p, len) ? -EFAULT : len;
759 }
760
761 #endif
762
763 static int str_to_user(const char *str, unsigned int maxlen, void __user *p)
764 {
765 int len;
766
767 if (!str)
768 return -ENOENT;
769
770 len = strlen(str) + 1;
771 if (len > maxlen)
772 len = maxlen;
773
774 return copy_to_user(p, str, len) ? -EFAULT : len;
775 }
776
777 static int handle_eviocgbit(struct input_dev *dev,
778 unsigned int type, unsigned int size,
779 void __user *p, int compat_mode)
780 {
781 unsigned long *bits;
782 int len;
783
784 switch (type) {
785
786 case 0: bits = dev->evbit; len = EV_MAX; break;
787 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
788 case EV_REL: bits = dev->relbit; len = REL_MAX; break;
789 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
790 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
791 case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
792 case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
793 case EV_FF: bits = dev->ffbit; len = FF_MAX; break;
794 case EV_SW: bits = dev->swbit; len = SW_MAX; break;
795 default: return -EINVAL;
796 }
797
798 return bits_to_user(bits, len, size, p, compat_mode);
799 }
800
801 static int evdev_handle_get_keycode(struct input_dev *dev, void __user *p)
802 {
803 struct input_keymap_entry ke = {
804 .len = sizeof(unsigned int),
805 .flags = 0,
806 };
807 int __user *ip = (int __user *)p;
808 int error;
809
810
811 if (copy_from_user(ke.scancode, p, sizeof(unsigned int)))
812 return -EFAULT;
813
814 error = input_get_keycode(dev, &ke);
815 if (error)
816 return error;
817
818 if (put_user(ke.keycode, ip + 1))
819 return -EFAULT;
820
821 return 0;
822 }
823
824 static int evdev_handle_get_keycode_v2(struct input_dev *dev, void __user *p)
825 {
826 struct input_keymap_entry ke;
827 int error;
828
829 if (copy_from_user(&ke, p, sizeof(ke)))
830 return -EFAULT;
831
832 error = input_get_keycode(dev, &ke);
833 if (error)
834 return error;
835
836 if (copy_to_user(p, &ke, sizeof(ke)))
837 return -EFAULT;
838
839 return 0;
840 }
841
842 static int evdev_handle_set_keycode(struct input_dev *dev, void __user *p)
843 {
844 struct input_keymap_entry ke = {
845 .len = sizeof(unsigned int),
846 .flags = 0,
847 };
848 int __user *ip = (int __user *)p;
849
850 if (copy_from_user(ke.scancode, p, sizeof(unsigned int)))
851 return -EFAULT;
852
853 if (get_user(ke.keycode, ip + 1))
854 return -EFAULT;
855
856 return input_set_keycode(dev, &ke);
857 }
858
859 static int evdev_handle_set_keycode_v2(struct input_dev *dev, void __user *p)
860 {
861 struct input_keymap_entry ke;
862
863 if (copy_from_user(&ke, p, sizeof(ke)))
864 return -EFAULT;
865
866 if (ke.len > sizeof(ke.scancode))
867 return -EINVAL;
868
869 return input_set_keycode(dev, &ke);
870 }
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885 static int evdev_handle_get_val(struct evdev_client *client,
886 struct input_dev *dev, unsigned int type,
887 unsigned long *bits, unsigned int maxbit,
888 unsigned int maxlen, void __user *p,
889 int compat)
890 {
891 int ret;
892 unsigned long *mem;
893
894 mem = bitmap_alloc(maxbit, GFP_KERNEL);
895 if (!mem)
896 return -ENOMEM;
897
898 spin_lock_irq(&dev->event_lock);
899 spin_lock(&client->buffer_lock);
900
901 bitmap_copy(mem, bits, maxbit);
902
903 spin_unlock(&dev->event_lock);
904
905 __evdev_flush_queue(client, type);
906
907 spin_unlock_irq(&client->buffer_lock);
908
909 ret = bits_to_user(mem, maxbit, maxlen, p, compat);
910 if (ret < 0)
911 evdev_queue_syn_dropped(client);
912
913 bitmap_free(mem);
914
915 return ret;
916 }
917
918 static int evdev_handle_mt_request(struct input_dev *dev,
919 unsigned int size,
920 int __user *ip)
921 {
922 const struct input_mt *mt = dev->mt;
923 unsigned int code;
924 int max_slots;
925 int i;
926
927 if (get_user(code, &ip[0]))
928 return -EFAULT;
929 if (!mt || !input_is_mt_value(code))
930 return -EINVAL;
931
932 max_slots = (size - sizeof(__u32)) / sizeof(__s32);
933 for (i = 0; i < mt->num_slots && i < max_slots; i++) {
934 int value = input_mt_get_value(&mt->slots[i], code);
935 if (put_user(value, &ip[1 + i]))
936 return -EFAULT;
937 }
938
939 return 0;
940 }
941
942 static int evdev_revoke(struct evdev *evdev, struct evdev_client *client,
943 struct file *file)
944 {
945 client->revoked = true;
946 evdev_ungrab(evdev, client);
947 input_flush_device(&evdev->handle, file);
948 wake_up_interruptible(&evdev->wait);
949
950 return 0;
951 }
952
953
954 static int evdev_set_mask(struct evdev_client *client,
955 unsigned int type,
956 const void __user *codes,
957 u32 codes_size,
958 int compat)
959 {
960 unsigned long flags, *mask, *oldmask;
961 size_t cnt;
962 int error;
963
964
965 cnt = evdev_get_mask_cnt(type);
966 if (!cnt)
967 return 0;
968
969 mask = bitmap_zalloc(cnt, GFP_KERNEL);
970 if (!mask)
971 return -ENOMEM;
972
973 error = bits_from_user(mask, cnt - 1, codes_size, codes, compat);
974 if (error < 0) {
975 bitmap_free(mask);
976 return error;
977 }
978
979 spin_lock_irqsave(&client->buffer_lock, flags);
980 oldmask = client->evmasks[type];
981 client->evmasks[type] = mask;
982 spin_unlock_irqrestore(&client->buffer_lock, flags);
983
984 bitmap_free(oldmask);
985
986 return 0;
987 }
988
989
990 static int evdev_get_mask(struct evdev_client *client,
991 unsigned int type,
992 void __user *codes,
993 u32 codes_size,
994 int compat)
995 {
996 unsigned long *mask;
997 size_t cnt, size, xfer_size;
998 int i;
999 int error;
1000
1001
1002 cnt = evdev_get_mask_cnt(type);
1003 size = sizeof(unsigned long) * BITS_TO_LONGS(cnt);
1004 xfer_size = min_t(size_t, codes_size, size);
1005
1006 if (cnt > 0) {
1007 mask = client->evmasks[type];
1008 if (mask) {
1009 error = bits_to_user(mask, cnt - 1,
1010 xfer_size, codes, compat);
1011 if (error < 0)
1012 return error;
1013 } else {
1014
1015 for (i = 0; i < xfer_size; i++)
1016 if (put_user(0xffU, (u8 __user *)codes + i))
1017 return -EFAULT;
1018 }
1019 }
1020
1021 if (xfer_size < codes_size)
1022 if (clear_user(codes + xfer_size, codes_size - xfer_size))
1023 return -EFAULT;
1024
1025 return 0;
1026 }
1027
1028 static long evdev_do_ioctl(struct file *file, unsigned int cmd,
1029 void __user *p, int compat_mode)
1030 {
1031 struct evdev_client *client = file->private_data;
1032 struct evdev *evdev = client->evdev;
1033 struct input_dev *dev = evdev->handle.dev;
1034 struct input_absinfo abs;
1035 struct input_mask mask;
1036 struct ff_effect effect;
1037 int __user *ip = (int __user *)p;
1038 unsigned int i, t, u, v;
1039 unsigned int size;
1040 int error;
1041
1042
1043 switch (cmd) {
1044
1045 case EVIOCGVERSION:
1046 return put_user(EV_VERSION, ip);
1047
1048 case EVIOCGID:
1049 if (copy_to_user(p, &dev->id, sizeof(struct input_id)))
1050 return -EFAULT;
1051 return 0;
1052
1053 case EVIOCGREP:
1054 if (!test_bit(EV_REP, dev->evbit))
1055 return -ENOSYS;
1056 if (put_user(dev->rep[REP_DELAY], ip))
1057 return -EFAULT;
1058 if (put_user(dev->rep[REP_PERIOD], ip + 1))
1059 return -EFAULT;
1060 return 0;
1061
1062 case EVIOCSREP:
1063 if (!test_bit(EV_REP, dev->evbit))
1064 return -ENOSYS;
1065 if (get_user(u, ip))
1066 return -EFAULT;
1067 if (get_user(v, ip + 1))
1068 return -EFAULT;
1069
1070 input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u);
1071 input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v);
1072
1073 return 0;
1074
1075 case EVIOCRMFF:
1076 return input_ff_erase(dev, (int)(unsigned long) p, file);
1077
1078 case EVIOCGEFFECTS:
1079 i = test_bit(EV_FF, dev->evbit) ?
1080 dev->ff->max_effects : 0;
1081 if (put_user(i, ip))
1082 return -EFAULT;
1083 return 0;
1084
1085 case EVIOCGRAB:
1086 if (p)
1087 return evdev_grab(evdev, client);
1088 else
1089 return evdev_ungrab(evdev, client);
1090
1091 case EVIOCREVOKE:
1092 if (p)
1093 return -EINVAL;
1094 else
1095 return evdev_revoke(evdev, client, file);
1096
1097 case EVIOCGMASK: {
1098 void __user *codes_ptr;
1099
1100 if (copy_from_user(&mask, p, sizeof(mask)))
1101 return -EFAULT;
1102
1103 codes_ptr = (void __user *)(unsigned long)mask.codes_ptr;
1104 return evdev_get_mask(client,
1105 mask.type, codes_ptr, mask.codes_size,
1106 compat_mode);
1107 }
1108
1109 case EVIOCSMASK: {
1110 const void __user *codes_ptr;
1111
1112 if (copy_from_user(&mask, p, sizeof(mask)))
1113 return -EFAULT;
1114
1115 codes_ptr = (const void __user *)(unsigned long)mask.codes_ptr;
1116 return evdev_set_mask(client,
1117 mask.type, codes_ptr, mask.codes_size,
1118 compat_mode);
1119 }
1120
1121 case EVIOCSCLOCKID:
1122 if (copy_from_user(&i, p, sizeof(unsigned int)))
1123 return -EFAULT;
1124
1125 return evdev_set_clk_type(client, i);
1126
1127 case EVIOCGKEYCODE:
1128 return evdev_handle_get_keycode(dev, p);
1129
1130 case EVIOCSKEYCODE:
1131 return evdev_handle_set_keycode(dev, p);
1132
1133 case EVIOCGKEYCODE_V2:
1134 return evdev_handle_get_keycode_v2(dev, p);
1135
1136 case EVIOCSKEYCODE_V2:
1137 return evdev_handle_set_keycode_v2(dev, p);
1138 }
1139
1140 size = _IOC_SIZE(cmd);
1141
1142
1143 #define EVIOC_MASK_SIZE(nr) ((nr) & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT))
1144 switch (EVIOC_MASK_SIZE(cmd)) {
1145
1146 case EVIOCGPROP(0):
1147 return bits_to_user(dev->propbit, INPUT_PROP_MAX,
1148 size, p, compat_mode);
1149
1150 case EVIOCGMTSLOTS(0):
1151 return evdev_handle_mt_request(dev, size, ip);
1152
1153 case EVIOCGKEY(0):
1154 return evdev_handle_get_val(client, dev, EV_KEY, dev->key,
1155 KEY_MAX, size, p, compat_mode);
1156
1157 case EVIOCGLED(0):
1158 return evdev_handle_get_val(client, dev, EV_LED, dev->led,
1159 LED_MAX, size, p, compat_mode);
1160
1161 case EVIOCGSND(0):
1162 return evdev_handle_get_val(client, dev, EV_SND, dev->snd,
1163 SND_MAX, size, p, compat_mode);
1164
1165 case EVIOCGSW(0):
1166 return evdev_handle_get_val(client, dev, EV_SW, dev->sw,
1167 SW_MAX, size, p, compat_mode);
1168
1169 case EVIOCGNAME(0):
1170 return str_to_user(dev->name, size, p);
1171
1172 case EVIOCGPHYS(0):
1173 return str_to_user(dev->phys, size, p);
1174
1175 case EVIOCGUNIQ(0):
1176 return str_to_user(dev->uniq, size, p);
1177
1178 case EVIOC_MASK_SIZE(EVIOCSFF):
1179 if (input_ff_effect_from_user(p, size, &effect))
1180 return -EFAULT;
1181
1182 error = input_ff_upload(dev, &effect, file);
1183 if (error)
1184 return error;
1185
1186 if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
1187 return -EFAULT;
1188
1189 return 0;
1190 }
1191
1192
1193 if (_IOC_TYPE(cmd) != 'E')
1194 return -EINVAL;
1195
1196 if (_IOC_DIR(cmd) == _IOC_READ) {
1197
1198 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0)))
1199 return handle_eviocgbit(dev,
1200 _IOC_NR(cmd) & EV_MAX, size,
1201 p, compat_mode);
1202
1203 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
1204
1205 if (!dev->absinfo)
1206 return -EINVAL;
1207
1208 t = _IOC_NR(cmd) & ABS_MAX;
1209 abs = dev->absinfo[t];
1210
1211 if (copy_to_user(p, &abs, min_t(size_t,
1212 size, sizeof(struct input_absinfo))))
1213 return -EFAULT;
1214
1215 return 0;
1216 }
1217 }
1218
1219 if (_IOC_DIR(cmd) == _IOC_WRITE) {
1220
1221 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
1222
1223 if (!dev->absinfo)
1224 return -EINVAL;
1225
1226 t = _IOC_NR(cmd) & ABS_MAX;
1227
1228 if (copy_from_user(&abs, p, min_t(size_t,
1229 size, sizeof(struct input_absinfo))))
1230 return -EFAULT;
1231
1232 if (size < sizeof(struct input_absinfo))
1233 abs.resolution = 0;
1234
1235
1236 if (t == ABS_MT_SLOT)
1237 return -EINVAL;
1238
1239
1240
1241
1242
1243
1244 spin_lock_irq(&dev->event_lock);
1245 dev->absinfo[t] = abs;
1246 spin_unlock_irq(&dev->event_lock);
1247
1248 return 0;
1249 }
1250 }
1251
1252 return -EINVAL;
1253 }
1254
1255 static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
1256 void __user *p, int compat_mode)
1257 {
1258 struct evdev_client *client = file->private_data;
1259 struct evdev *evdev = client->evdev;
1260 int retval;
1261
1262 retval = mutex_lock_interruptible(&evdev->mutex);
1263 if (retval)
1264 return retval;
1265
1266 if (!evdev->exist || client->revoked) {
1267 retval = -ENODEV;
1268 goto out;
1269 }
1270
1271 retval = evdev_do_ioctl(file, cmd, p, compat_mode);
1272
1273 out:
1274 mutex_unlock(&evdev->mutex);
1275 return retval;
1276 }
1277
1278 static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1279 {
1280 return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);
1281 }
1282
1283 #ifdef CONFIG_COMPAT
1284 static long evdev_ioctl_compat(struct file *file,
1285 unsigned int cmd, unsigned long arg)
1286 {
1287 return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1);
1288 }
1289 #endif
1290
1291 static const struct file_operations evdev_fops = {
1292 .owner = THIS_MODULE,
1293 .read = evdev_read,
1294 .write = evdev_write,
1295 .poll = evdev_poll,
1296 .open = evdev_open,
1297 .release = evdev_release,
1298 .unlocked_ioctl = evdev_ioctl,
1299 #ifdef CONFIG_COMPAT
1300 .compat_ioctl = evdev_ioctl_compat,
1301 #endif
1302 .fasync = evdev_fasync,
1303 .llseek = no_llseek,
1304 };
1305
1306
1307
1308
1309
1310
1311 static void evdev_mark_dead(struct evdev *evdev)
1312 {
1313 mutex_lock(&evdev->mutex);
1314 evdev->exist = false;
1315 mutex_unlock(&evdev->mutex);
1316 }
1317
1318 static void evdev_cleanup(struct evdev *evdev)
1319 {
1320 struct input_handle *handle = &evdev->handle;
1321
1322 evdev_mark_dead(evdev);
1323 evdev_hangup(evdev);
1324
1325
1326 if (evdev->open) {
1327 input_flush_device(handle, NULL);
1328 input_close_device(handle);
1329 }
1330 }
1331
1332
1333
1334
1335
1336 static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
1337 const struct input_device_id *id)
1338 {
1339 struct evdev *evdev;
1340 int minor;
1341 int dev_no;
1342 int error;
1343
1344 minor = input_get_new_minor(EVDEV_MINOR_BASE, EVDEV_MINORS, true);
1345 if (minor < 0) {
1346 error = minor;
1347 pr_err("failed to reserve new minor: %d\n", error);
1348 return error;
1349 }
1350
1351 evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL);
1352 if (!evdev) {
1353 error = -ENOMEM;
1354 goto err_free_minor;
1355 }
1356
1357 INIT_LIST_HEAD(&evdev->client_list);
1358 spin_lock_init(&evdev->client_lock);
1359 mutex_init(&evdev->mutex);
1360 init_waitqueue_head(&evdev->wait);
1361 evdev->exist = true;
1362
1363 dev_no = minor;
1364
1365 if (dev_no < EVDEV_MINOR_BASE + EVDEV_MINORS)
1366 dev_no -= EVDEV_MINOR_BASE;
1367 dev_set_name(&evdev->dev, "event%d", dev_no);
1368
1369 evdev->handle.dev = input_get_device(dev);
1370 evdev->handle.name = dev_name(&evdev->dev);
1371 evdev->handle.handler = handler;
1372 evdev->handle.private = evdev;
1373
1374 evdev->dev.devt = MKDEV(INPUT_MAJOR, minor);
1375 evdev->dev.class = &input_class;
1376 evdev->dev.parent = &dev->dev;
1377 evdev->dev.release = evdev_free;
1378 device_initialize(&evdev->dev);
1379
1380 error = input_register_handle(&evdev->handle);
1381 if (error)
1382 goto err_free_evdev;
1383
1384 cdev_init(&evdev->cdev, &evdev_fops);
1385
1386 error = cdev_device_add(&evdev->cdev, &evdev->dev);
1387 if (error)
1388 goto err_cleanup_evdev;
1389
1390 return 0;
1391
1392 err_cleanup_evdev:
1393 evdev_cleanup(evdev);
1394 input_unregister_handle(&evdev->handle);
1395 err_free_evdev:
1396 put_device(&evdev->dev);
1397 err_free_minor:
1398 input_free_minor(minor);
1399 return error;
1400 }
1401
1402 static void evdev_disconnect(struct input_handle *handle)
1403 {
1404 struct evdev *evdev = handle->private;
1405
1406 cdev_device_del(&evdev->cdev, &evdev->dev);
1407 evdev_cleanup(evdev);
1408 input_free_minor(MINOR(evdev->dev.devt));
1409 input_unregister_handle(handle);
1410 put_device(&evdev->dev);
1411 }
1412
1413 static const struct input_device_id evdev_ids[] = {
1414 { .driver_info = 1 },
1415 { },
1416 };
1417
1418 MODULE_DEVICE_TABLE(input, evdev_ids);
1419
1420 static struct input_handler evdev_handler = {
1421 .event = evdev_event,
1422 .events = evdev_events,
1423 .connect = evdev_connect,
1424 .disconnect = evdev_disconnect,
1425 .legacy_minors = true,
1426 .minor = EVDEV_MINOR_BASE,
1427 .name = "evdev",
1428 .id_table = evdev_ids,
1429 };
1430
1431 static int __init evdev_init(void)
1432 {
1433 return input_register_handler(&evdev_handler);
1434 }
1435
1436 static void __exit evdev_exit(void)
1437 {
1438 input_unregister_handler(&evdev_handler);
1439 }
1440
1441 module_init(evdev_init);
1442 module_exit(evdev_exit);
1443
1444 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
1445 MODULE_DESCRIPTION("Input driver event char devices");
1446 MODULE_LICENSE("GPL");