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1 | /* |
2 | * Event char devices, giving access to raw input device events. |
3 | * |
4 | * Copyright (c) 1999-2002 Vojtech Pavlik |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify it |
7 | * under the terms of the GNU General Public License version 2 as published by |
8 | * the Free Software Foundation. |
9 | */ |
10 | |
11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
12 | |
13 | #define EVDEV_MINOR_BASE 64 |
14 | #define EVDEV_MINORS 32 |
15 | #define EVDEV_MIN_BUFFER_SIZE 64U |
16 | #define EVDEV_BUF_PACKETS 8 |
17 | |
18 | #include <linux/poll.h> |
19 | #include <linux/sched.h> |
20 | #include <linux/slab.h> |
21 | #include <linux/vmalloc.h> |
22 | #include <linux/mm.h> |
23 | #include <linux/module.h> |
24 | #include <linux/init.h> |
25 | #include <linux/input/mt.h> |
26 | #include <linux/major.h> |
27 | #include <linux/device.h> |
28 | #include <linux/cdev.h> |
29 | #include "input-compat.h" |
30 | |
31 | struct evdev { |
32 | int open; |
33 | struct input_handle handle; |
34 | wait_queue_head_t wait; |
35 | struct evdev_client __rcu *grab; |
36 | struct list_head client_list; |
37 | spinlock_t client_lock; /* protects client_list */ |
38 | struct mutex mutex; |
39 | struct device dev; |
40 | struct cdev cdev; |
41 | bool exist; |
42 | }; |
43 | |
44 | struct evdev_client { |
45 | unsigned int head; |
46 | unsigned int tail; |
47 | unsigned int packet_head; /* [future] position of the first element of next packet */ |
48 | spinlock_t buffer_lock; /* protects access to buffer, head and tail */ |
49 | struct fasync_struct *fasync; |
50 | struct evdev *evdev; |
51 | struct list_head node; |
52 | int clkid; |
53 | bool revoked; |
54 | unsigned int bufsize; |
55 | struct input_event buffer[]; |
56 | }; |
57 | |
58 | /* flush queued events of type @type, caller must hold client->buffer_lock */ |
59 | static void __evdev_flush_queue(struct evdev_client *client, unsigned int type) |
60 | { |
61 | unsigned int i, head, num; |
62 | unsigned int mask = client->bufsize - 1; |
63 | bool is_report; |
64 | struct input_event *ev; |
65 | |
66 | BUG_ON(type == EV_SYN); |
67 | |
68 | head = client->tail; |
69 | client->packet_head = client->tail; |
70 | |
71 | /* init to 1 so a leading SYN_REPORT will not be dropped */ |
72 | num = 1; |
73 | |
74 | for (i = client->tail; i != client->head; i = (i + 1) & mask) { |
75 | ev = &client->buffer[i]; |
76 | is_report = ev->type == EV_SYN && ev->code == SYN_REPORT; |
77 | |
78 | if (ev->type == type) { |
79 | /* drop matched entry */ |
80 | continue; |
81 | } else if (is_report && !num) { |
82 | /* drop empty SYN_REPORT groups */ |
83 | continue; |
84 | } else if (head != i) { |
85 | /* move entry to fill the gap */ |
86 | client->buffer[head].time = ev->time; |
87 | client->buffer[head].type = ev->type; |
88 | client->buffer[head].code = ev->code; |
89 | client->buffer[head].value = ev->value; |
90 | } |
91 | |
92 | num++; |
93 | head = (head + 1) & mask; |
94 | |
95 | if (is_report) { |
96 | num = 0; |
97 | client->packet_head = head; |
98 | } |
99 | } |
100 | |
101 | client->head = head; |
102 | } |
103 | |
104 | /* queue SYN_DROPPED event */ |
105 | static void evdev_queue_syn_dropped(struct evdev_client *client) |
106 | { |
107 | unsigned long flags; |
108 | struct input_event ev; |
109 | ktime_t time; |
110 | |
111 | time = (client->clkid == CLOCK_MONOTONIC) ? |
112 | ktime_get() : ktime_get_real(); |
113 | |
114 | ev.time = ktime_to_timeval(time); |
115 | ev.type = EV_SYN; |
116 | ev.code = SYN_DROPPED; |
117 | ev.value = 0; |
118 | |
119 | spin_lock_irqsave(&client->buffer_lock, flags); |
120 | |
121 | client->buffer[client->head++] = ev; |
122 | client->head &= client->bufsize - 1; |
123 | |
124 | if (unlikely(client->head == client->tail)) { |
125 | /* drop queue but keep our SYN_DROPPED event */ |
126 | client->tail = (client->head - 1) & (client->bufsize - 1); |
127 | client->packet_head = client->tail; |
128 | } |
129 | |
130 | spin_unlock_irqrestore(&client->buffer_lock, flags); |
131 | } |
132 | |
133 | static void __pass_event(struct evdev_client *client, |
134 | const struct input_event *event) |
135 | { |
136 | client->buffer[client->head++] = *event; |
137 | client->head &= client->bufsize - 1; |
138 | |
139 | if (unlikely(client->head == client->tail)) { |
140 | /* |
141 | * This effectively "drops" all unconsumed events, leaving |
142 | * EV_SYN/SYN_DROPPED plus the newest event in the queue. |
143 | */ |
144 | client->tail = (client->head - 2) & (client->bufsize - 1); |
145 | |
146 | client->buffer[client->tail].time = event->time; |
147 | client->buffer[client->tail].type = EV_SYN; |
148 | client->buffer[client->tail].code = SYN_DROPPED; |
149 | client->buffer[client->tail].value = 0; |
150 | |
151 | client->packet_head = client->tail; |
152 | } |
153 | |
154 | if (event->type == EV_SYN && event->code == SYN_REPORT) { |
155 | client->packet_head = client->head; |
156 | kill_fasync(&client->fasync, SIGIO, POLL_IN); |
157 | } |
158 | } |
159 | |
160 | static void evdev_pass_values(struct evdev_client *client, |
161 | const struct input_value *vals, unsigned int count, |
162 | ktime_t mono, ktime_t real) |
163 | { |
164 | struct evdev *evdev = client->evdev; |
165 | const struct input_value *v; |
166 | struct input_event event; |
167 | bool wakeup = false; |
168 | |
169 | if (client->revoked) |
170 | return; |
171 | |
172 | event.time = ktime_to_timeval(client->clkid == CLOCK_MONOTONIC ? |
173 | mono : real); |
174 | |
175 | /* Interrupts are disabled, just acquire the lock. */ |
176 | spin_lock(&client->buffer_lock); |
177 | |
178 | for (v = vals; v != vals + count; v++) { |
179 | event.type = v->type; |
180 | event.code = v->code; |
181 | event.value = v->value; |
182 | __pass_event(client, &event); |
183 | if (v->type == EV_SYN && v->code == SYN_REPORT) |
184 | wakeup = true; |
185 | } |
186 | |
187 | spin_unlock(&client->buffer_lock); |
188 | |
189 | if (wakeup) |
190 | wake_up_interruptible(&evdev->wait); |
191 | } |
192 | |
193 | /* |
194 | * Pass incoming events to all connected clients. |
195 | */ |
196 | static void evdev_events(struct input_handle *handle, |
197 | const struct input_value *vals, unsigned int count) |
198 | { |
199 | struct evdev *evdev = handle->private; |
200 | struct evdev_client *client; |
201 | ktime_t time_mono, time_real; |
202 | |
203 | time_mono = ktime_get(); |
204 | time_real = ktime_mono_to_real(time_mono); |
205 | |
206 | rcu_read_lock(); |
207 | |
208 | client = rcu_dereference(evdev->grab); |
209 | |
210 | if (client) |
211 | evdev_pass_values(client, vals, count, time_mono, time_real); |
212 | else |
213 | list_for_each_entry_rcu(client, &evdev->client_list, node) |
214 | evdev_pass_values(client, vals, count, |
215 | time_mono, time_real); |
216 | |
217 | rcu_read_unlock(); |
218 | } |
219 | |
220 | /* |
221 | * Pass incoming event to all connected clients. |
222 | */ |
223 | static void evdev_event(struct input_handle *handle, |
224 | unsigned int type, unsigned int code, int value) |
225 | { |
226 | struct input_value vals[] = { { type, code, value } }; |
227 | |
228 | evdev_events(handle, vals, 1); |
229 | } |
230 | |
231 | static int evdev_fasync(int fd, struct file *file, int on) |
232 | { |
233 | struct evdev_client *client = file->private_data; |
234 | |
235 | return fasync_helper(fd, file, on, &client->fasync); |
236 | } |
237 | |
238 | static int evdev_flush(struct file *file, fl_owner_t id) |
239 | { |
240 | struct evdev_client *client = file->private_data; |
241 | struct evdev *evdev = client->evdev; |
242 | int retval; |
243 | |
244 | retval = mutex_lock_interruptible(&evdev->mutex); |
245 | if (retval) |
246 | return retval; |
247 | |
248 | if (!evdev->exist || client->revoked) |
249 | retval = -ENODEV; |
250 | else |
251 | retval = input_flush_device(&evdev->handle, file); |
252 | |
253 | mutex_unlock(&evdev->mutex); |
254 | return retval; |
255 | } |
256 | |
257 | static void evdev_free(struct device *dev) |
258 | { |
259 | struct evdev *evdev = container_of(dev, struct evdev, dev); |
260 | |
261 | input_put_device(evdev->handle.dev); |
262 | kfree(evdev); |
263 | } |
264 | |
265 | /* |
266 | * Grabs an event device (along with underlying input device). |
267 | * This function is called with evdev->mutex taken. |
268 | */ |
269 | static int evdev_grab(struct evdev *evdev, struct evdev_client *client) |
270 | { |
271 | int error; |
272 | |
273 | if (evdev->grab) |
274 | return -EBUSY; |
275 | |
276 | error = input_grab_device(&evdev->handle); |
277 | if (error) |
278 | return error; |
279 | |
280 | rcu_assign_pointer(evdev->grab, client); |
281 | |
282 | return 0; |
283 | } |
284 | |
285 | static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client) |
286 | { |
287 | struct evdev_client *grab = rcu_dereference_protected(evdev->grab, |
288 | lockdep_is_held(&evdev->mutex)); |
289 | |
290 | if (grab != client) |
291 | return -EINVAL; |
292 | |
293 | rcu_assign_pointer(evdev->grab, NULL); |
294 | synchronize_rcu(); |
295 | input_release_device(&evdev->handle); |
296 | |
297 | return 0; |
298 | } |
299 | |
300 | static void evdev_attach_client(struct evdev *evdev, |
301 | struct evdev_client *client) |
302 | { |
303 | spin_lock(&evdev->client_lock); |
304 | list_add_tail_rcu(&client->node, &evdev->client_list); |
305 | spin_unlock(&evdev->client_lock); |
306 | } |
307 | |
308 | static void evdev_detach_client(struct evdev *evdev, |
309 | struct evdev_client *client) |
310 | { |
311 | spin_lock(&evdev->client_lock); |
312 | list_del_rcu(&client->node); |
313 | spin_unlock(&evdev->client_lock); |
314 | synchronize_rcu(); |
315 | } |
316 | |
317 | static int evdev_open_device(struct evdev *evdev) |
318 | { |
319 | int retval; |
320 | |
321 | retval = mutex_lock_interruptible(&evdev->mutex); |
322 | if (retval) |
323 | return retval; |
324 | |
325 | if (!evdev->exist) |
326 | retval = -ENODEV; |
327 | else if (!evdev->open++) { |
328 | retval = input_open_device(&evdev->handle); |
329 | if (retval) |
330 | evdev->open--; |
331 | } |
332 | |
333 | mutex_unlock(&evdev->mutex); |
334 | return retval; |
335 | } |
336 | |
337 | static void evdev_close_device(struct evdev *evdev) |
338 | { |
339 | mutex_lock(&evdev->mutex); |
340 | |
341 | if (evdev->exist && !--evdev->open) |
342 | input_close_device(&evdev->handle); |
343 | |
344 | mutex_unlock(&evdev->mutex); |
345 | } |
346 | |
347 | /* |
348 | * Wake up users waiting for IO so they can disconnect from |
349 | * dead device. |
350 | */ |
351 | static void evdev_hangup(struct evdev *evdev) |
352 | { |
353 | struct evdev_client *client; |
354 | |
355 | spin_lock(&evdev->client_lock); |
356 | list_for_each_entry(client, &evdev->client_list, node) |
357 | kill_fasync(&client->fasync, SIGIO, POLL_HUP); |
358 | spin_unlock(&evdev->client_lock); |
359 | |
360 | wake_up_interruptible(&evdev->wait); |
361 | } |
362 | |
363 | static int evdev_release(struct inode *inode, struct file *file) |
364 | { |
365 | struct evdev_client *client = file->private_data; |
366 | struct evdev *evdev = client->evdev; |
367 | |
368 | mutex_lock(&evdev->mutex); |
369 | evdev_ungrab(evdev, client); |
370 | mutex_unlock(&evdev->mutex); |
371 | |
372 | evdev_detach_client(evdev, client); |
373 | |
374 | if (is_vmalloc_addr(client)) |
375 | vfree(client); |
376 | else |
377 | kfree(client); |
378 | |
379 | evdev_close_device(evdev); |
380 | |
381 | return 0; |
382 | } |
383 | |
384 | static unsigned int evdev_compute_buffer_size(struct input_dev *dev) |
385 | { |
386 | unsigned int n_events = |
387 | max(dev->hint_events_per_packet * EVDEV_BUF_PACKETS, |
388 | EVDEV_MIN_BUFFER_SIZE); |
389 | |
390 | return roundup_pow_of_two(n_events); |
391 | } |
392 | |
393 | static int evdev_open(struct inode *inode, struct file *file) |
394 | { |
395 | struct evdev *evdev = container_of(inode->i_cdev, struct evdev, cdev); |
396 | unsigned int bufsize = evdev_compute_buffer_size(evdev->handle.dev); |
397 | unsigned int size = sizeof(struct evdev_client) + |
398 | bufsize * sizeof(struct input_event); |
399 | struct evdev_client *client; |
400 | int error; |
401 | |
402 | client = kzalloc(size, GFP_KERNEL | __GFP_NOWARN); |
403 | if (!client) |
404 | client = vzalloc(size); |
405 | if (!client) |
406 | return -ENOMEM; |
407 | |
408 | client->bufsize = bufsize; |
409 | spin_lock_init(&client->buffer_lock); |
410 | client->evdev = evdev; |
411 | evdev_attach_client(evdev, client); |
412 | |
413 | error = evdev_open_device(evdev); |
414 | if (error) |
415 | goto err_free_client; |
416 | |
417 | file->private_data = client; |
418 | nonseekable_open(inode, file); |
419 | |
420 | return 0; |
421 | |
422 | err_free_client: |
423 | evdev_detach_client(evdev, client); |
424 | kvfree(client); |
425 | return error; |
426 | } |
427 | |
428 | static ssize_t evdev_write(struct file *file, const char __user *buffer, |
429 | size_t count, loff_t *ppos) |
430 | { |
431 | struct evdev_client *client = file->private_data; |
432 | struct evdev *evdev = client->evdev; |
433 | struct input_event event; |
434 | int retval = 0; |
435 | |
436 | if (count != 0 && count < input_event_size()) |
437 | return -EINVAL; |
438 | |
439 | retval = mutex_lock_interruptible(&evdev->mutex); |
440 | if (retval) |
441 | return retval; |
442 | |
443 | if (!evdev->exist || client->revoked) { |
444 | retval = -ENODEV; |
445 | goto out; |
446 | } |
447 | |
448 | while (retval + input_event_size() <= count) { |
449 | |
450 | if (input_event_from_user(buffer + retval, &event)) { |
451 | retval = -EFAULT; |
452 | goto out; |
453 | } |
454 | retval += input_event_size(); |
455 | |
456 | input_inject_event(&evdev->handle, |
457 | event.type, event.code, event.value); |
458 | } |
459 | |
460 | out: |
461 | mutex_unlock(&evdev->mutex); |
462 | return retval; |
463 | } |
464 | |
465 | static int evdev_fetch_next_event(struct evdev_client *client, |
466 | struct input_event *event) |
467 | { |
468 | int have_event; |
469 | |
470 | spin_lock_irq(&client->buffer_lock); |
471 | |
472 | have_event = client->packet_head != client->tail; |
473 | if (have_event) { |
474 | *event = client->buffer[client->tail++]; |
475 | client->tail &= client->bufsize - 1; |
476 | } |
477 | |
478 | spin_unlock_irq(&client->buffer_lock); |
479 | |
480 | return have_event; |
481 | } |
482 | |
483 | static ssize_t evdev_read(struct file *file, char __user *buffer, |
484 | size_t count, loff_t *ppos) |
485 | { |
486 | struct evdev_client *client = file->private_data; |
487 | struct evdev *evdev = client->evdev; |
488 | struct input_event event; |
489 | size_t read = 0; |
490 | int error; |
491 | |
492 | if (count != 0 && count < input_event_size()) |
493 | return -EINVAL; |
494 | |
495 | for (;;) { |
496 | if (!evdev->exist || client->revoked) |
497 | return -ENODEV; |
498 | |
499 | if (client->packet_head == client->tail && |
500 | (file->f_flags & O_NONBLOCK)) |
501 | return -EAGAIN; |
502 | |
503 | /* |
504 | * count == 0 is special - no IO is done but we check |
505 | * for error conditions (see above). |
506 | */ |
507 | if (count == 0) |
508 | break; |
509 | |
510 | while (read + input_event_size() <= count && |
511 | evdev_fetch_next_event(client, &event)) { |
512 | |
513 | if (input_event_to_user(buffer + read, &event)) |
514 | return -EFAULT; |
515 | |
516 | read += input_event_size(); |
517 | } |
518 | |
519 | if (read) |
520 | break; |
521 | |
522 | if (!(file->f_flags & O_NONBLOCK)) { |
523 | error = wait_event_interruptible(evdev->wait, |
524 | client->packet_head != client->tail || |
525 | !evdev->exist || client->revoked); |
526 | if (error) |
527 | return error; |
528 | } |
529 | } |
530 | |
531 | return read; |
532 | } |
533 | |
534 | /* No kernel lock - fine */ |
535 | static unsigned int evdev_poll(struct file *file, poll_table *wait) |
536 | { |
537 | struct evdev_client *client = file->private_data; |
538 | struct evdev *evdev = client->evdev; |
539 | unsigned int mask; |
540 | |
541 | poll_wait(file, &evdev->wait, wait); |
542 | |
543 | if (evdev->exist && !client->revoked) |
544 | mask = POLLOUT | POLLWRNORM; |
545 | else |
546 | mask = POLLHUP | POLLERR; |
547 | |
548 | if (client->packet_head != client->tail) |
549 | mask |= POLLIN | POLLRDNORM; |
550 | |
551 | return mask; |
552 | } |
553 | |
554 | #ifdef CONFIG_COMPAT |
555 | |
556 | #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) |
557 | #define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1) |
558 | |
559 | #ifdef __BIG_ENDIAN |
560 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, |
561 | unsigned int maxlen, void __user *p, int compat) |
562 | { |
563 | int len, i; |
564 | |
565 | if (compat) { |
566 | len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t); |
567 | if (len > maxlen) |
568 | len = maxlen; |
569 | |
570 | for (i = 0; i < len / sizeof(compat_long_t); i++) |
571 | if (copy_to_user((compat_long_t __user *) p + i, |
572 | (compat_long_t *) bits + |
573 | i + 1 - ((i % 2) << 1), |
574 | sizeof(compat_long_t))) |
575 | return -EFAULT; |
576 | } else { |
577 | len = BITS_TO_LONGS(maxbit) * sizeof(long); |
578 | if (len > maxlen) |
579 | len = maxlen; |
580 | |
581 | if (copy_to_user(p, bits, len)) |
582 | return -EFAULT; |
583 | } |
584 | |
585 | return len; |
586 | } |
587 | #else |
588 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, |
589 | unsigned int maxlen, void __user *p, int compat) |
590 | { |
591 | int len = compat ? |
592 | BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) : |
593 | BITS_TO_LONGS(maxbit) * sizeof(long); |
594 | |
595 | if (len > maxlen) |
596 | len = maxlen; |
597 | |
598 | return copy_to_user(p, bits, len) ? -EFAULT : len; |
599 | } |
600 | #endif /* __BIG_ENDIAN */ |
601 | |
602 | #else |
603 | |
604 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, |
605 | unsigned int maxlen, void __user *p, int compat) |
606 | { |
607 | int len = BITS_TO_LONGS(maxbit) * sizeof(long); |
608 | |
609 | if (len > maxlen) |
610 | len = maxlen; |
611 | |
612 | return copy_to_user(p, bits, len) ? -EFAULT : len; |
613 | } |
614 | |
615 | #endif /* CONFIG_COMPAT */ |
616 | |
617 | static int str_to_user(const char *str, unsigned int maxlen, void __user *p) |
618 | { |
619 | int len; |
620 | |
621 | if (!str) |
622 | return -ENOENT; |
623 | |
624 | len = strlen(str) + 1; |
625 | if (len > maxlen) |
626 | len = maxlen; |
627 | |
628 | return copy_to_user(p, str, len) ? -EFAULT : len; |
629 | } |
630 | |
631 | static int handle_eviocgbit(struct input_dev *dev, |
632 | unsigned int type, unsigned int size, |
633 | void __user *p, int compat_mode) |
634 | { |
635 | unsigned long *bits; |
636 | int len; |
637 | |
638 | switch (type) { |
639 | |
640 | case 0: bits = dev->evbit; len = EV_MAX; break; |
641 | case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; |
642 | case EV_REL: bits = dev->relbit; len = REL_MAX; break; |
643 | case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; |
644 | case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; |
645 | case EV_LED: bits = dev->ledbit; len = LED_MAX; break; |
646 | case EV_SND: bits = dev->sndbit; len = SND_MAX; break; |
647 | case EV_FF: bits = dev->ffbit; len = FF_MAX; break; |
648 | case EV_SW: bits = dev->swbit; len = SW_MAX; break; |
649 | default: return -EINVAL; |
650 | } |
651 | |
652 | return bits_to_user(bits, len, size, p, compat_mode); |
653 | } |
654 | |
655 | static int evdev_handle_get_keycode(struct input_dev *dev, void __user *p) |
656 | { |
657 | struct input_keymap_entry ke = { |
658 | .len = sizeof(unsigned int), |
659 | .flags = 0, |
660 | }; |
661 | int __user *ip = (int __user *)p; |
662 | int error; |
663 | |
664 | /* legacy case */ |
665 | if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) |
666 | return -EFAULT; |
667 | |
668 | error = input_get_keycode(dev, &ke); |
669 | if (error) |
670 | return error; |
671 | |
672 | if (put_user(ke.keycode, ip + 1)) |
673 | return -EFAULT; |
674 | |
675 | return 0; |
676 | } |
677 | |
678 | static int evdev_handle_get_keycode_v2(struct input_dev *dev, void __user *p) |
679 | { |
680 | struct input_keymap_entry ke; |
681 | int error; |
682 | |
683 | if (copy_from_user(&ke, p, sizeof(ke))) |
684 | return -EFAULT; |
685 | |
686 | error = input_get_keycode(dev, &ke); |
687 | if (error) |
688 | return error; |
689 | |
690 | if (copy_to_user(p, &ke, sizeof(ke))) |
691 | return -EFAULT; |
692 | |
693 | return 0; |
694 | } |
695 | |
696 | static int evdev_handle_set_keycode(struct input_dev *dev, void __user *p) |
697 | { |
698 | struct input_keymap_entry ke = { |
699 | .len = sizeof(unsigned int), |
700 | .flags = 0, |
701 | }; |
702 | int __user *ip = (int __user *)p; |
703 | |
704 | if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) |
705 | return -EFAULT; |
706 | |
707 | if (get_user(ke.keycode, ip + 1)) |
708 | return -EFAULT; |
709 | |
710 | return input_set_keycode(dev, &ke); |
711 | } |
712 | |
713 | static int evdev_handle_set_keycode_v2(struct input_dev *dev, void __user *p) |
714 | { |
715 | struct input_keymap_entry ke; |
716 | |
717 | if (copy_from_user(&ke, p, sizeof(ke))) |
718 | return -EFAULT; |
719 | |
720 | if (ke.len > sizeof(ke.scancode)) |
721 | return -EINVAL; |
722 | |
723 | return input_set_keycode(dev, &ke); |
724 | } |
725 | |
726 | /* |
727 | * If we transfer state to the user, we should flush all pending events |
728 | * of the same type from the client's queue. Otherwise, they might end up |
729 | * with duplicate events, which can screw up client's state tracking. |
730 | * If bits_to_user fails after flushing the queue, we queue a SYN_DROPPED |
731 | * event so user-space will notice missing events. |
732 | * |
733 | * LOCKING: |
734 | * We need to take event_lock before buffer_lock to avoid dead-locks. But we |
735 | * need the even_lock only to guarantee consistent state. We can safely release |
736 | * it while flushing the queue. This allows input-core to handle filters while |
737 | * we flush the queue. |
738 | */ |
739 | static int evdev_handle_get_val(struct evdev_client *client, |
740 | struct input_dev *dev, unsigned int type, |
741 | unsigned long *bits, unsigned int maxbit, |
742 | unsigned int maxlen, void __user *p, |
743 | int compat) |
744 | { |
745 | int ret; |
746 | unsigned long *mem; |
747 | size_t len; |
748 | |
749 | len = BITS_TO_LONGS(maxbit) * sizeof(unsigned long); |
750 | mem = kmalloc(len, GFP_KERNEL); |
751 | if (!mem) |
752 | return -ENOMEM; |
753 | |
754 | spin_lock_irq(&dev->event_lock); |
755 | spin_lock(&client->buffer_lock); |
756 | |
757 | memcpy(mem, bits, len); |
758 | |
759 | spin_unlock(&dev->event_lock); |
760 | |
761 | __evdev_flush_queue(client, type); |
762 | |
763 | spin_unlock_irq(&client->buffer_lock); |
764 | |
765 | ret = bits_to_user(mem, maxbit, maxlen, p, compat); |
766 | if (ret < 0) |
767 | evdev_queue_syn_dropped(client); |
768 | |
769 | kfree(mem); |
770 | |
771 | return ret; |
772 | } |
773 | |
774 | static int evdev_handle_mt_request(struct input_dev *dev, |
775 | unsigned int size, |
776 | int __user *ip) |
777 | { |
778 | const struct input_mt *mt = dev->mt; |
779 | unsigned int code; |
780 | int max_slots; |
781 | int i; |
782 | |
783 | if (get_user(code, &ip[0])) |
784 | return -EFAULT; |
785 | if (!mt || !input_is_mt_value(code)) |
786 | return -EINVAL; |
787 | |
788 | max_slots = (size - sizeof(__u32)) / sizeof(__s32); |
789 | for (i = 0; i < mt->num_slots && i < max_slots; i++) { |
790 | int value = input_mt_get_value(&mt->slots[i], code); |
791 | if (put_user(value, &ip[1 + i])) |
792 | return -EFAULT; |
793 | } |
794 | |
795 | return 0; |
796 | } |
797 | |
798 | static int evdev_revoke(struct evdev *evdev, struct evdev_client *client, |
799 | struct file *file) |
800 | { |
801 | client->revoked = true; |
802 | evdev_ungrab(evdev, client); |
803 | input_flush_device(&evdev->handle, file); |
804 | wake_up_interruptible(&evdev->wait); |
805 | |
806 | return 0; |
807 | } |
808 | |
809 | static long evdev_do_ioctl(struct file *file, unsigned int cmd, |
810 | void __user *p, int compat_mode) |
811 | { |
812 | struct evdev_client *client = file->private_data; |
813 | struct evdev *evdev = client->evdev; |
814 | struct input_dev *dev = evdev->handle.dev; |
815 | struct input_absinfo abs; |
816 | struct ff_effect effect; |
817 | int __user *ip = (int __user *)p; |
818 | unsigned int i, t, u, v; |
819 | unsigned int size; |
820 | int error; |
821 | |
822 | /* First we check for fixed-length commands */ |
823 | switch (cmd) { |
824 | |
825 | case EVIOCGVERSION: |
826 | return put_user(EV_VERSION, ip); |
827 | |
828 | case EVIOCGID: |
829 | if (copy_to_user(p, &dev->id, sizeof(struct input_id))) |
830 | return -EFAULT; |
831 | return 0; |
832 | |
833 | case EVIOCGREP: |
834 | if (!test_bit(EV_REP, dev->evbit)) |
835 | return -ENOSYS; |
836 | if (put_user(dev->rep[REP_DELAY], ip)) |
837 | return -EFAULT; |
838 | if (put_user(dev->rep[REP_PERIOD], ip + 1)) |
839 | return -EFAULT; |
840 | return 0; |
841 | |
842 | case EVIOCSREP: |
843 | if (!test_bit(EV_REP, dev->evbit)) |
844 | return -ENOSYS; |
845 | if (get_user(u, ip)) |
846 | return -EFAULT; |
847 | if (get_user(v, ip + 1)) |
848 | return -EFAULT; |
849 | |
850 | input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u); |
851 | input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v); |
852 | |
853 | return 0; |
854 | |
855 | case EVIOCRMFF: |
856 | return input_ff_erase(dev, (int)(unsigned long) p, file); |
857 | |
858 | case EVIOCGEFFECTS: |
859 | i = test_bit(EV_FF, dev->evbit) ? |
860 | dev->ff->max_effects : 0; |
861 | if (put_user(i, ip)) |
862 | return -EFAULT; |
863 | return 0; |
864 | |
865 | case EVIOCGRAB: |
866 | if (p) |
867 | return evdev_grab(evdev, client); |
868 | else |
869 | return evdev_ungrab(evdev, client); |
870 | |
871 | case EVIOCREVOKE: |
872 | if (p) |
873 | return -EINVAL; |
874 | else |
875 | return evdev_revoke(evdev, client, file); |
876 | |
877 | case EVIOCSCLOCKID: |
878 | if (copy_from_user(&i, p, sizeof(unsigned int))) |
879 | return -EFAULT; |
880 | if (i != CLOCK_MONOTONIC && i != CLOCK_REALTIME) |
881 | return -EINVAL; |
882 | client->clkid = i; |
883 | return 0; |
884 | |
885 | case EVIOCGKEYCODE: |
886 | return evdev_handle_get_keycode(dev, p); |
887 | |
888 | case EVIOCSKEYCODE: |
889 | return evdev_handle_set_keycode(dev, p); |
890 | |
891 | case EVIOCGKEYCODE_V2: |
892 | return evdev_handle_get_keycode_v2(dev, p); |
893 | |
894 | case EVIOCSKEYCODE_V2: |
895 | return evdev_handle_set_keycode_v2(dev, p); |
896 | } |
897 | |
898 | size = _IOC_SIZE(cmd); |
899 | |
900 | /* Now check variable-length commands */ |
901 | #define EVIOC_MASK_SIZE(nr) ((nr) & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) |
902 | switch (EVIOC_MASK_SIZE(cmd)) { |
903 | |
904 | case EVIOCGPROP(0): |
905 | return bits_to_user(dev->propbit, INPUT_PROP_MAX, |
906 | size, p, compat_mode); |
907 | |
908 | case EVIOCGMTSLOTS(0): |
909 | return evdev_handle_mt_request(dev, size, ip); |
910 | |
911 | case EVIOCGKEY(0): |
912 | return evdev_handle_get_val(client, dev, EV_KEY, dev->key, |
913 | KEY_MAX, size, p, compat_mode); |
914 | |
915 | case EVIOCGLED(0): |
916 | return evdev_handle_get_val(client, dev, EV_LED, dev->led, |
917 | LED_MAX, size, p, compat_mode); |
918 | |
919 | case EVIOCGSND(0): |
920 | return evdev_handle_get_val(client, dev, EV_SND, dev->snd, |
921 | SND_MAX, size, p, compat_mode); |
922 | |
923 | case EVIOCGSW(0): |
924 | return evdev_handle_get_val(client, dev, EV_SW, dev->sw, |
925 | SW_MAX, size, p, compat_mode); |
926 | |
927 | case EVIOCGNAME(0): |
928 | return str_to_user(dev->name, size, p); |
929 | |
930 | case EVIOCGPHYS(0): |
931 | return str_to_user(dev->phys, size, p); |
932 | |
933 | case EVIOCGUNIQ(0): |
934 | return str_to_user(dev->uniq, size, p); |
935 | |
936 | case EVIOC_MASK_SIZE(EVIOCSFF): |
937 | if (input_ff_effect_from_user(p, size, &effect)) |
938 | return -EFAULT; |
939 | |
940 | error = input_ff_upload(dev, &effect, file); |
941 | if (error) |
942 | return error; |
943 | |
944 | if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) |
945 | return -EFAULT; |
946 | |
947 | return 0; |
948 | } |
949 | |
950 | /* Multi-number variable-length handlers */ |
951 | if (_IOC_TYPE(cmd) != 'E') |
952 | return -EINVAL; |
953 | |
954 | if (_IOC_DIR(cmd) == _IOC_READ) { |
955 | |
956 | if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0))) |
957 | return handle_eviocgbit(dev, |
958 | _IOC_NR(cmd) & EV_MAX, size, |
959 | p, compat_mode); |
960 | |
961 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { |
962 | |
963 | if (!dev->absinfo) |
964 | return -EINVAL; |
965 | |
966 | t = _IOC_NR(cmd) & ABS_MAX; |
967 | abs = dev->absinfo[t]; |
968 | |
969 | if (copy_to_user(p, &abs, min_t(size_t, |
970 | size, sizeof(struct input_absinfo)))) |
971 | return -EFAULT; |
972 | |
973 | return 0; |
974 | } |
975 | } |
976 | |
977 | if (_IOC_DIR(cmd) == _IOC_WRITE) { |
978 | |
979 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { |
980 | |
981 | if (!dev->absinfo) |
982 | return -EINVAL; |
983 | |
984 | t = _IOC_NR(cmd) & ABS_MAX; |
985 | |
986 | if (copy_from_user(&abs, p, min_t(size_t, |
987 | size, sizeof(struct input_absinfo)))) |
988 | return -EFAULT; |
989 | |
990 | if (size < sizeof(struct input_absinfo)) |
991 | abs.resolution = 0; |
992 | |
993 | /* We can't change number of reserved MT slots */ |
994 | if (t == ABS_MT_SLOT) |
995 | return -EINVAL; |
996 | |
997 | /* |
998 | * Take event lock to ensure that we are not |
999 | * changing device parameters in the middle |
1000 | * of event. |
1001 | */ |
1002 | spin_lock_irq(&dev->event_lock); |
1003 | dev->absinfo[t] = abs; |
1004 | spin_unlock_irq(&dev->event_lock); |
1005 | |
1006 | return 0; |
1007 | } |
1008 | } |
1009 | |
1010 | return -EINVAL; |
1011 | } |
1012 | |
1013 | static long evdev_ioctl_handler(struct file *file, unsigned int cmd, |
1014 | void __user *p, int compat_mode) |
1015 | { |
1016 | struct evdev_client *client = file->private_data; |
1017 | struct evdev *evdev = client->evdev; |
1018 | int retval; |
1019 | |
1020 | retval = mutex_lock_interruptible(&evdev->mutex); |
1021 | if (retval) |
1022 | return retval; |
1023 | |
1024 | if (!evdev->exist || client->revoked) { |
1025 | retval = -ENODEV; |
1026 | goto out; |
1027 | } |
1028 | |
1029 | retval = evdev_do_ioctl(file, cmd, p, compat_mode); |
1030 | |
1031 | out: |
1032 | mutex_unlock(&evdev->mutex); |
1033 | return retval; |
1034 | } |
1035 | |
1036 | static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1037 | { |
1038 | return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0); |
1039 | } |
1040 | |
1041 | #ifdef CONFIG_COMPAT |
1042 | static long evdev_ioctl_compat(struct file *file, |
1043 | unsigned int cmd, unsigned long arg) |
1044 | { |
1045 | return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1); |
1046 | } |
1047 | #endif |
1048 | |
1049 | static const struct file_operations evdev_fops = { |
1050 | .owner = THIS_MODULE, |
1051 | .read = evdev_read, |
1052 | .write = evdev_write, |
1053 | .poll = evdev_poll, |
1054 | .open = evdev_open, |
1055 | .release = evdev_release, |
1056 | .unlocked_ioctl = evdev_ioctl, |
1057 | #ifdef CONFIG_COMPAT |
1058 | .compat_ioctl = evdev_ioctl_compat, |
1059 | #endif |
1060 | .fasync = evdev_fasync, |
1061 | .flush = evdev_flush, |
1062 | .llseek = no_llseek, |
1063 | }; |
1064 | |
1065 | /* |
1066 | * Mark device non-existent. This disables writes, ioctls and |
1067 | * prevents new users from opening the device. Already posted |
1068 | * blocking reads will stay, however new ones will fail. |
1069 | */ |
1070 | static void evdev_mark_dead(struct evdev *evdev) |
1071 | { |
1072 | mutex_lock(&evdev->mutex); |
1073 | evdev->exist = false; |
1074 | mutex_unlock(&evdev->mutex); |
1075 | } |
1076 | |
1077 | static void evdev_cleanup(struct evdev *evdev) |
1078 | { |
1079 | struct input_handle *handle = &evdev->handle; |
1080 | |
1081 | evdev_mark_dead(evdev); |
1082 | evdev_hangup(evdev); |
1083 | |
1084 | cdev_del(&evdev->cdev); |
1085 | |
1086 | /* evdev is marked dead so no one else accesses evdev->open */ |
1087 | if (evdev->open) { |
1088 | input_flush_device(handle, NULL); |
1089 | input_close_device(handle); |
1090 | } |
1091 | } |
1092 | |
1093 | /* |
1094 | * Create new evdev device. Note that input core serializes calls |
1095 | * to connect and disconnect. |
1096 | */ |
1097 | static int evdev_connect(struct input_handler *handler, struct input_dev *dev, |
1098 | const struct input_device_id *id) |
1099 | { |
1100 | struct evdev *evdev; |
1101 | int minor; |
1102 | int dev_no; |
1103 | int error; |
1104 | |
1105 | minor = input_get_new_minor(EVDEV_MINOR_BASE, EVDEV_MINORS, true); |
1106 | if (minor < 0) { |
1107 | error = minor; |
1108 | pr_err("failed to reserve new minor: %d\n", error); |
1109 | return error; |
1110 | } |
1111 | |
1112 | evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL); |
1113 | if (!evdev) { |
1114 | error = -ENOMEM; |
1115 | goto err_free_minor; |
1116 | } |
1117 | |
1118 | INIT_LIST_HEAD(&evdev->client_list); |
1119 | spin_lock_init(&evdev->client_lock); |
1120 | mutex_init(&evdev->mutex); |
1121 | init_waitqueue_head(&evdev->wait); |
1122 | evdev->exist = true; |
1123 | |
1124 | dev_no = minor; |
1125 | /* Normalize device number if it falls into legacy range */ |
1126 | if (dev_no < EVDEV_MINOR_BASE + EVDEV_MINORS) |
1127 | dev_no -= EVDEV_MINOR_BASE; |
1128 | dev_set_name(&evdev->dev, "event%d", dev_no); |
1129 | |
1130 | evdev->handle.dev = input_get_device(dev); |
1131 | evdev->handle.name = dev_name(&evdev->dev); |
1132 | evdev->handle.handler = handler; |
1133 | evdev->handle.private = evdev; |
1134 | |
1135 | evdev->dev.devt = MKDEV(INPUT_MAJOR, minor); |
1136 | evdev->dev.class = &input_class; |
1137 | evdev->dev.parent = &dev->dev; |
1138 | evdev->dev.release = evdev_free; |
1139 | device_initialize(&evdev->dev); |
1140 | |
1141 | error = input_register_handle(&evdev->handle); |
1142 | if (error) |
1143 | goto err_free_evdev; |
1144 | |
1145 | cdev_init(&evdev->cdev, &evdev_fops); |
1146 | evdev->cdev.kobj.parent = &evdev->dev.kobj; |
1147 | error = cdev_add(&evdev->cdev, evdev->dev.devt, 1); |
1148 | if (error) |
1149 | goto err_unregister_handle; |
1150 | |
1151 | error = device_add(&evdev->dev); |
1152 | if (error) |
1153 | goto err_cleanup_evdev; |
1154 | |
1155 | return 0; |
1156 | |
1157 | err_cleanup_evdev: |
1158 | evdev_cleanup(evdev); |
1159 | err_unregister_handle: |
1160 | input_unregister_handle(&evdev->handle); |
1161 | err_free_evdev: |
1162 | put_device(&evdev->dev); |
1163 | err_free_minor: |
1164 | input_free_minor(minor); |
1165 | return error; |
1166 | } |
1167 | |
1168 | static void evdev_disconnect(struct input_handle *handle) |
1169 | { |
1170 | struct evdev *evdev = handle->private; |
1171 | |
1172 | device_del(&evdev->dev); |
1173 | evdev_cleanup(evdev); |
1174 | input_free_minor(MINOR(evdev->dev.devt)); |
1175 | input_unregister_handle(handle); |
1176 | put_device(&evdev->dev); |
1177 | } |
1178 | |
1179 | static const struct input_device_id evdev_ids[] = { |
1180 | { .driver_info = 1 }, /* Matches all devices */ |
1181 | { }, /* Terminating zero entry */ |
1182 | }; |
1183 | |
1184 | MODULE_DEVICE_TABLE(input, evdev_ids); |
1185 | |
1186 | static struct input_handler evdev_handler = { |
1187 | .event = evdev_event, |
1188 | .events = evdev_events, |
1189 | .connect = evdev_connect, |
1190 | .disconnect = evdev_disconnect, |
1191 | .legacy_minors = true, |
1192 | .minor = EVDEV_MINOR_BASE, |
1193 | .name = "evdev", |
1194 | .id_table = evdev_ids, |
1195 | }; |
1196 | |
1197 | static int __init evdev_init(void) |
1198 | { |
1199 | return input_register_handler(&evdev_handler); |
1200 | } |
1201 | |
1202 | static void __exit evdev_exit(void) |
1203 | { |
1204 | input_unregister_handler(&evdev_handler); |
1205 | } |
1206 | |
1207 | module_init(evdev_init); |
1208 | module_exit(evdev_exit); |
1209 | |
1210 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); |
1211 | MODULE_DESCRIPTION("Input driver event char devices"); |
1212 | MODULE_LICENSE("GPL"); |
1213 |
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Tags:
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