Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | ||
da0c4901 JP |
11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
12 | ||
1da177e4 LT |
13 | #define EVDEV_MINOR_BASE 64 |
14 | #define EVDEV_MINORS 32 | |
63a6404d HR |
15 | #define EVDEV_MIN_BUFFER_SIZE 64U |
16 | #define EVDEV_BUF_PACKETS 8 | |
1da177e4 LT |
17 | |
18 | #include <linux/poll.h> | |
a99bbaf5 | 19 | #include <linux/sched.h> |
1da177e4 LT |
20 | #include <linux/slab.h> |
21 | #include <linux/module.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/input.h> | |
24 | #include <linux/major.h> | |
1da177e4 | 25 | #include <linux/device.h> |
2d56f3a3 | 26 | #include "input-compat.h" |
1da177e4 LT |
27 | |
28 | struct evdev { | |
1da177e4 LT |
29 | int open; |
30 | int minor; | |
1da177e4 LT |
31 | struct input_handle handle; |
32 | wait_queue_head_t wait; | |
2be85279 | 33 | struct evdev_client __rcu *grab; |
d0ffb9be | 34 | struct list_head client_list; |
6addb1d6 DT |
35 | spinlock_t client_lock; /* protects client_list */ |
36 | struct mutex mutex; | |
9657d75c | 37 | struct device dev; |
20da92de | 38 | bool exist; |
1da177e4 LT |
39 | }; |
40 | ||
d0ffb9be | 41 | struct evdev_client { |
1da177e4 LT |
42 | int head; |
43 | int tail; | |
6addb1d6 | 44 | spinlock_t buffer_lock; /* protects access to buffer, head and tail */ |
1da177e4 LT |
45 | struct fasync_struct *fasync; |
46 | struct evdev *evdev; | |
47 | struct list_head node; | |
b58f7086 HR |
48 | int bufsize; |
49 | struct input_event buffer[]; | |
1da177e4 LT |
50 | }; |
51 | ||
52 | static struct evdev *evdev_table[EVDEV_MINORS]; | |
6addb1d6 | 53 | static DEFINE_MUTEX(evdev_table_mutex); |
1da177e4 | 54 | |
6addb1d6 DT |
55 | static void evdev_pass_event(struct evdev_client *client, |
56 | struct input_event *event) | |
57 | { | |
58 | /* | |
e725a494 HR |
59 | * Interrupts are disabled, just acquire the lock. |
60 | * Make sure we don't leave with the client buffer | |
61 | * "empty" by having client->head == client->tail. | |
6addb1d6 DT |
62 | */ |
63 | spin_lock(&client->buffer_lock); | |
e725a494 HR |
64 | do { |
65 | client->buffer[client->head++] = *event; | |
66 | client->head &= client->bufsize - 1; | |
67 | } while (client->head == client->tail); | |
6addb1d6 DT |
68 | spin_unlock(&client->buffer_lock); |
69 | ||
30a589fd AJ |
70 | if (event->type == EV_SYN) |
71 | kill_fasync(&client->fasync, SIGIO, POLL_IN); | |
6addb1d6 DT |
72 | } |
73 | ||
74 | /* | |
82ba56c2 | 75 | * Pass incoming event to all connected clients. |
6addb1d6 DT |
76 | */ |
77 | static void evdev_event(struct input_handle *handle, | |
78 | unsigned int type, unsigned int code, int value) | |
1da177e4 LT |
79 | { |
80 | struct evdev *evdev = handle->private; | |
d0ffb9be | 81 | struct evdev_client *client; |
6addb1d6 | 82 | struct input_event event; |
1da177e4 | 83 | |
6addb1d6 DT |
84 | do_gettimeofday(&event.time); |
85 | event.type = type; | |
86 | event.code = code; | |
87 | event.value = value; | |
1da177e4 | 88 | |
82ba56c2 DT |
89 | rcu_read_lock(); |
90 | ||
6addb1d6 DT |
91 | client = rcu_dereference(evdev->grab); |
92 | if (client) | |
93 | evdev_pass_event(client, &event); | |
94 | else | |
95 | list_for_each_entry_rcu(client, &evdev->client_list, node) | |
96 | evdev_pass_event(client, &event); | |
1da177e4 | 97 | |
82ba56c2 DT |
98 | rcu_read_unlock(); |
99 | ||
1da177e4 LT |
100 | wake_up_interruptible(&evdev->wait); |
101 | } | |
102 | ||
103 | static int evdev_fasync(int fd, struct file *file, int on) | |
104 | { | |
d0ffb9be | 105 | struct evdev_client *client = file->private_data; |
1e0afb28 | 106 | |
60aa4924 | 107 | return fasync_helper(fd, file, on, &client->fasync); |
1da177e4 LT |
108 | } |
109 | ||
1e0afb28 | 110 | static int evdev_flush(struct file *file, fl_owner_t id) |
1da177e4 | 111 | { |
d0ffb9be DT |
112 | struct evdev_client *client = file->private_data; |
113 | struct evdev *evdev = client->evdev; | |
6addb1d6 DT |
114 | int retval; |
115 | ||
116 | retval = mutex_lock_interruptible(&evdev->mutex); | |
117 | if (retval) | |
118 | return retval; | |
1e0afb28 | 119 | |
d0ffb9be | 120 | if (!evdev->exist) |
6addb1d6 DT |
121 | retval = -ENODEV; |
122 | else | |
123 | retval = input_flush_device(&evdev->handle, file); | |
1e0afb28 | 124 | |
6addb1d6 DT |
125 | mutex_unlock(&evdev->mutex); |
126 | return retval; | |
1da177e4 LT |
127 | } |
128 | ||
9657d75c | 129 | static void evdev_free(struct device *dev) |
1da177e4 | 130 | { |
9657d75c DT |
131 | struct evdev *evdev = container_of(dev, struct evdev, dev); |
132 | ||
a7097ff8 | 133 | input_put_device(evdev->handle.dev); |
1da177e4 LT |
134 | kfree(evdev); |
135 | } | |
136 | ||
6addb1d6 DT |
137 | /* |
138 | * Grabs an event device (along with underlying input device). | |
139 | * This function is called with evdev->mutex taken. | |
140 | */ | |
141 | static int evdev_grab(struct evdev *evdev, struct evdev_client *client) | |
142 | { | |
143 | int error; | |
144 | ||
145 | if (evdev->grab) | |
146 | return -EBUSY; | |
147 | ||
148 | error = input_grab_device(&evdev->handle); | |
149 | if (error) | |
150 | return error; | |
151 | ||
152 | rcu_assign_pointer(evdev->grab, client); | |
82ba56c2 | 153 | synchronize_rcu(); |
6addb1d6 DT |
154 | |
155 | return 0; | |
156 | } | |
157 | ||
158 | static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client) | |
159 | { | |
160 | if (evdev->grab != client) | |
161 | return -EINVAL; | |
162 | ||
163 | rcu_assign_pointer(evdev->grab, NULL); | |
82ba56c2 | 164 | synchronize_rcu(); |
6addb1d6 DT |
165 | input_release_device(&evdev->handle); |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
170 | static void evdev_attach_client(struct evdev *evdev, | |
171 | struct evdev_client *client) | |
172 | { | |
173 | spin_lock(&evdev->client_lock); | |
174 | list_add_tail_rcu(&client->node, &evdev->client_list); | |
175 | spin_unlock(&evdev->client_lock); | |
82ba56c2 | 176 | synchronize_rcu(); |
6addb1d6 DT |
177 | } |
178 | ||
179 | static void evdev_detach_client(struct evdev *evdev, | |
180 | struct evdev_client *client) | |
181 | { | |
182 | spin_lock(&evdev->client_lock); | |
183 | list_del_rcu(&client->node); | |
184 | spin_unlock(&evdev->client_lock); | |
82ba56c2 | 185 | synchronize_rcu(); |
6addb1d6 DT |
186 | } |
187 | ||
188 | static int evdev_open_device(struct evdev *evdev) | |
189 | { | |
190 | int retval; | |
191 | ||
192 | retval = mutex_lock_interruptible(&evdev->mutex); | |
193 | if (retval) | |
194 | return retval; | |
195 | ||
196 | if (!evdev->exist) | |
197 | retval = -ENODEV; | |
06445014 | 198 | else if (!evdev->open++) { |
6addb1d6 | 199 | retval = input_open_device(&evdev->handle); |
06445014 ON |
200 | if (retval) |
201 | evdev->open--; | |
202 | } | |
6addb1d6 DT |
203 | |
204 | mutex_unlock(&evdev->mutex); | |
205 | return retval; | |
206 | } | |
207 | ||
208 | static void evdev_close_device(struct evdev *evdev) | |
209 | { | |
210 | mutex_lock(&evdev->mutex); | |
211 | ||
212 | if (evdev->exist && !--evdev->open) | |
213 | input_close_device(&evdev->handle); | |
214 | ||
215 | mutex_unlock(&evdev->mutex); | |
216 | } | |
217 | ||
218 | /* | |
219 | * Wake up users waiting for IO so they can disconnect from | |
220 | * dead device. | |
221 | */ | |
222 | static void evdev_hangup(struct evdev *evdev) | |
223 | { | |
224 | struct evdev_client *client; | |
225 | ||
226 | spin_lock(&evdev->client_lock); | |
227 | list_for_each_entry(client, &evdev->client_list, node) | |
228 | kill_fasync(&client->fasync, SIGIO, POLL_HUP); | |
229 | spin_unlock(&evdev->client_lock); | |
230 | ||
231 | wake_up_interruptible(&evdev->wait); | |
232 | } | |
233 | ||
d0ffb9be | 234 | static int evdev_release(struct inode *inode, struct file *file) |
1da177e4 | 235 | { |
d0ffb9be DT |
236 | struct evdev_client *client = file->private_data; |
237 | struct evdev *evdev = client->evdev; | |
1da177e4 | 238 | |
6addb1d6 DT |
239 | mutex_lock(&evdev->mutex); |
240 | if (evdev->grab == client) | |
241 | evdev_ungrab(evdev, client); | |
242 | mutex_unlock(&evdev->mutex); | |
1da177e4 | 243 | |
6addb1d6 | 244 | evdev_detach_client(evdev, client); |
d0ffb9be | 245 | kfree(client); |
1da177e4 | 246 | |
6addb1d6 | 247 | evdev_close_device(evdev); |
9657d75c | 248 | put_device(&evdev->dev); |
1da177e4 | 249 | |
1da177e4 LT |
250 | return 0; |
251 | } | |
252 | ||
b58f7086 HR |
253 | static unsigned int evdev_compute_buffer_size(struct input_dev *dev) |
254 | { | |
63a6404d HR |
255 | unsigned int n_events = |
256 | max(dev->hint_events_per_packet * EVDEV_BUF_PACKETS, | |
257 | EVDEV_MIN_BUFFER_SIZE); | |
258 | ||
259 | return roundup_pow_of_two(n_events); | |
b58f7086 HR |
260 | } |
261 | ||
d0ffb9be | 262 | static int evdev_open(struct inode *inode, struct file *file) |
1da177e4 | 263 | { |
d0ffb9be | 264 | struct evdev *evdev; |
6addb1d6 | 265 | struct evdev_client *client; |
1da177e4 | 266 | int i = iminor(inode) - EVDEV_MINOR_BASE; |
b58f7086 | 267 | unsigned int bufsize; |
d542ed82 | 268 | int error; |
1da177e4 | 269 | |
d0ffb9be | 270 | if (i >= EVDEV_MINORS) |
1da177e4 LT |
271 | return -ENODEV; |
272 | ||
6addb1d6 DT |
273 | error = mutex_lock_interruptible(&evdev_table_mutex); |
274 | if (error) | |
275 | return error; | |
d0ffb9be | 276 | evdev = evdev_table[i]; |
6addb1d6 DT |
277 | if (evdev) |
278 | get_device(&evdev->dev); | |
279 | mutex_unlock(&evdev_table_mutex); | |
d0ffb9be | 280 | |
6addb1d6 | 281 | if (!evdev) |
1da177e4 LT |
282 | return -ENODEV; |
283 | ||
b58f7086 HR |
284 | bufsize = evdev_compute_buffer_size(evdev->handle.dev); |
285 | ||
286 | client = kzalloc(sizeof(struct evdev_client) + | |
287 | bufsize * sizeof(struct input_event), | |
288 | GFP_KERNEL); | |
9657d75c DT |
289 | if (!client) { |
290 | error = -ENOMEM; | |
291 | goto err_put_evdev; | |
292 | } | |
1da177e4 | 293 | |
b58f7086 | 294 | client->bufsize = bufsize; |
6addb1d6 | 295 | spin_lock_init(&client->buffer_lock); |
d0ffb9be | 296 | client->evdev = evdev; |
6addb1d6 | 297 | evdev_attach_client(evdev, client); |
1da177e4 | 298 | |
6addb1d6 DT |
299 | error = evdev_open_device(evdev); |
300 | if (error) | |
301 | goto err_free_client; | |
1da177e4 | 302 | |
d0ffb9be | 303 | file->private_data = client; |
3d7bbd45 DT |
304 | nonseekable_open(inode, file); |
305 | ||
1da177e4 | 306 | return 0; |
9657d75c DT |
307 | |
308 | err_free_client: | |
6addb1d6 | 309 | evdev_detach_client(evdev, client); |
9657d75c DT |
310 | kfree(client); |
311 | err_put_evdev: | |
312 | put_device(&evdev->dev); | |
313 | return error; | |
1da177e4 LT |
314 | } |
315 | ||
6addb1d6 DT |
316 | static ssize_t evdev_write(struct file *file, const char __user *buffer, |
317 | size_t count, loff_t *ppos) | |
3a51f7c4 | 318 | { |
d0ffb9be DT |
319 | struct evdev_client *client = file->private_data; |
320 | struct evdev *evdev = client->evdev; | |
3a51f7c4 | 321 | struct input_event event; |
6addb1d6 | 322 | int retval; |
52658bb6 | 323 | |
6addb1d6 DT |
324 | retval = mutex_lock_interruptible(&evdev->mutex); |
325 | if (retval) | |
326 | return retval; | |
327 | ||
328 | if (!evdev->exist) { | |
329 | retval = -ENODEV; | |
330 | goto out; | |
331 | } | |
52658bb6 | 332 | |
3a51f7c4 DT |
333 | while (retval < count) { |
334 | ||
2d56f3a3 | 335 | if (input_event_from_user(buffer + retval, &event)) { |
6addb1d6 DT |
336 | retval = -EFAULT; |
337 | goto out; | |
338 | } | |
339 | ||
340 | input_inject_event(&evdev->handle, | |
341 | event.type, event.code, event.value); | |
2d56f3a3 | 342 | retval += input_event_size(); |
52658bb6 JK |
343 | } |
344 | ||
6addb1d6 DT |
345 | out: |
346 | mutex_unlock(&evdev->mutex); | |
52658bb6 JK |
347 | return retval; |
348 | } | |
52658bb6 | 349 | |
6addb1d6 DT |
350 | static int evdev_fetch_next_event(struct evdev_client *client, |
351 | struct input_event *event) | |
352 | { | |
353 | int have_event; | |
354 | ||
355 | spin_lock_irq(&client->buffer_lock); | |
356 | ||
357 | have_event = client->head != client->tail; | |
358 | if (have_event) { | |
359 | *event = client->buffer[client->tail++]; | |
b58f7086 | 360 | client->tail &= client->bufsize - 1; |
6addb1d6 DT |
361 | } |
362 | ||
363 | spin_unlock_irq(&client->buffer_lock); | |
364 | ||
365 | return have_event; | |
366 | } | |
367 | ||
368 | static ssize_t evdev_read(struct file *file, char __user *buffer, | |
369 | size_t count, loff_t *ppos) | |
1da177e4 | 370 | { |
d0ffb9be DT |
371 | struct evdev_client *client = file->private_data; |
372 | struct evdev *evdev = client->evdev; | |
6addb1d6 | 373 | struct input_event event; |
1da177e4 LT |
374 | int retval; |
375 | ||
2d56f3a3 | 376 | if (count < input_event_size()) |
1da177e4 LT |
377 | return -EINVAL; |
378 | ||
6addb1d6 DT |
379 | if (client->head == client->tail && evdev->exist && |
380 | (file->f_flags & O_NONBLOCK)) | |
1da177e4 LT |
381 | return -EAGAIN; |
382 | ||
d0ffb9be DT |
383 | retval = wait_event_interruptible(evdev->wait, |
384 | client->head != client->tail || !evdev->exist); | |
1da177e4 LT |
385 | if (retval) |
386 | return retval; | |
387 | ||
d0ffb9be | 388 | if (!evdev->exist) |
1da177e4 LT |
389 | return -ENODEV; |
390 | ||
2d56f3a3 | 391 | while (retval + input_event_size() <= count && |
6addb1d6 | 392 | evdev_fetch_next_event(client, &event)) { |
3a51f7c4 | 393 | |
2d56f3a3 | 394 | if (input_event_to_user(buffer + retval, &event)) |
3a51f7c4 DT |
395 | return -EFAULT; |
396 | ||
2d56f3a3 | 397 | retval += input_event_size(); |
1da177e4 LT |
398 | } |
399 | ||
400 | return retval; | |
401 | } | |
402 | ||
403 | /* No kernel lock - fine */ | |
404 | static unsigned int evdev_poll(struct file *file, poll_table *wait) | |
405 | { | |
d0ffb9be DT |
406 | struct evdev_client *client = file->private_data; |
407 | struct evdev *evdev = client->evdev; | |
c18fb139 | 408 | unsigned int mask; |
1e0afb28 | 409 | |
d0ffb9be | 410 | poll_wait(file, &evdev->wait, wait); |
c18fb139 DT |
411 | |
412 | mask = evdev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR; | |
413 | if (client->head != client->tail) | |
414 | mask |= POLLIN | POLLRDNORM; | |
415 | ||
416 | return mask; | |
1da177e4 LT |
417 | } |
418 | ||
3a51f7c4 DT |
419 | #ifdef CONFIG_COMPAT |
420 | ||
421 | #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) | |
7b19ada2 | 422 | #define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1) |
3a51f7c4 DT |
423 | |
424 | #ifdef __BIG_ENDIAN | |
425 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
426 | unsigned int maxlen, void __user *p, int compat) | |
427 | { | |
428 | int len, i; | |
429 | ||
430 | if (compat) { | |
7b19ada2 | 431 | len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t); |
bf61f8d3 | 432 | if (len > maxlen) |
3a51f7c4 DT |
433 | len = maxlen; |
434 | ||
435 | for (i = 0; i < len / sizeof(compat_long_t); i++) | |
436 | if (copy_to_user((compat_long_t __user *) p + i, | |
437 | (compat_long_t *) bits + | |
438 | i + 1 - ((i % 2) << 1), | |
439 | sizeof(compat_long_t))) | |
440 | return -EFAULT; | |
441 | } else { | |
7b19ada2 | 442 | len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
443 | if (len > maxlen) |
444 | len = maxlen; | |
445 | ||
446 | if (copy_to_user(p, bits, len)) | |
447 | return -EFAULT; | |
448 | } | |
449 | ||
450 | return len; | |
451 | } | |
452 | #else | |
453 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
454 | unsigned int maxlen, void __user *p, int compat) | |
455 | { | |
456 | int len = compat ? | |
7b19ada2 JS |
457 | BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) : |
458 | BITS_TO_LONGS(maxbit) * sizeof(long); | |
3a51f7c4 DT |
459 | |
460 | if (len > maxlen) | |
461 | len = maxlen; | |
462 | ||
463 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
464 | } | |
465 | #endif /* __BIG_ENDIAN */ | |
466 | ||
467 | #else | |
468 | ||
469 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
470 | unsigned int maxlen, void __user *p, int compat) | |
471 | { | |
7b19ada2 | 472 | int len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
473 | |
474 | if (len > maxlen) | |
475 | len = maxlen; | |
476 | ||
477 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
478 | } | |
479 | ||
480 | #endif /* CONFIG_COMPAT */ | |
481 | ||
482 | static int str_to_user(const char *str, unsigned int maxlen, void __user *p) | |
483 | { | |
484 | int len; | |
485 | ||
486 | if (!str) | |
487 | return -ENOENT; | |
488 | ||
489 | len = strlen(str) + 1; | |
490 | if (len > maxlen) | |
491 | len = maxlen; | |
492 | ||
493 | return copy_to_user(p, str, len) ? -EFAULT : len; | |
494 | } | |
495 | ||
f2afa771 | 496 | #define OLD_KEY_MAX 0x1ff |
448cd166 DT |
497 | static int handle_eviocgbit(struct input_dev *dev, |
498 | unsigned int type, unsigned int size, | |
499 | void __user *p, int compat_mode) | |
5402a734 | 500 | { |
f2afa771 | 501 | static unsigned long keymax_warn_time; |
5402a734 LT |
502 | unsigned long *bits; |
503 | int len; | |
504 | ||
448cd166 | 505 | switch (type) { |
5402a734 LT |
506 | |
507 | case 0: bits = dev->evbit; len = EV_MAX; break; | |
508 | case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; | |
509 | case EV_REL: bits = dev->relbit; len = REL_MAX; break; | |
510 | case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; | |
511 | case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; | |
512 | case EV_LED: bits = dev->ledbit; len = LED_MAX; break; | |
513 | case EV_SND: bits = dev->sndbit; len = SND_MAX; break; | |
514 | case EV_FF: bits = dev->ffbit; len = FF_MAX; break; | |
515 | case EV_SW: bits = dev->swbit; len = SW_MAX; break; | |
516 | default: return -EINVAL; | |
517 | } | |
f2afa771 DT |
518 | |
519 | /* | |
520 | * Work around bugs in userspace programs that like to do | |
521 | * EVIOCGBIT(EV_KEY, KEY_MAX) and not realize that 'len' | |
522 | * should be in bytes, not in bits. | |
523 | */ | |
448cd166 | 524 | if (type == EV_KEY && size == OLD_KEY_MAX) { |
f2afa771 DT |
525 | len = OLD_KEY_MAX; |
526 | if (printk_timed_ratelimit(&keymax_warn_time, 10 * 1000)) | |
da0c4901 JP |
527 | pr_warning("(EVIOCGBIT): Suspicious buffer size %u, " |
528 | "limiting output to %zu bytes. See " | |
529 | "http://userweb.kernel.org/~dtor/eviocgbit-bug.html\n", | |
530 | OLD_KEY_MAX, | |
531 | BITS_TO_LONGS(OLD_KEY_MAX) * sizeof(long)); | |
f2afa771 DT |
532 | } |
533 | ||
448cd166 | 534 | return bits_to_user(bits, len, size, p, compat_mode); |
5402a734 | 535 | } |
f2afa771 | 536 | #undef OLD_KEY_MAX |
5402a734 | 537 | |
ab4e0192 | 538 | static int evdev_handle_get_keycode(struct input_dev *dev, void __user *p) |
8613e4c2 | 539 | { |
ab4e0192 DT |
540 | struct input_keymap_entry ke = { |
541 | .len = sizeof(unsigned int), | |
542 | .flags = 0, | |
543 | }; | |
544 | int __user *ip = (int __user *)p; | |
8613e4c2 MCC |
545 | int error; |
546 | ||
ab4e0192 DT |
547 | /* legacy case */ |
548 | if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) | |
549 | return -EFAULT; | |
8613e4c2 | 550 | |
ab4e0192 DT |
551 | error = input_get_keycode(dev, &ke); |
552 | if (error) | |
553 | return error; | |
8613e4c2 | 554 | |
ab4e0192 DT |
555 | if (put_user(ke.keycode, ip + 1)) |
556 | return -EFAULT; | |
8613e4c2 | 557 | |
ab4e0192 DT |
558 | return 0; |
559 | } | |
8613e4c2 | 560 | |
ab4e0192 DT |
561 | static int evdev_handle_get_keycode_v2(struct input_dev *dev, void __user *p) |
562 | { | |
563 | struct input_keymap_entry ke; | |
564 | int error; | |
8613e4c2 | 565 | |
ab4e0192 DT |
566 | if (copy_from_user(&ke, p, sizeof(ke))) |
567 | return -EFAULT; | |
8613e4c2 | 568 | |
ab4e0192 DT |
569 | error = input_get_keycode(dev, &ke); |
570 | if (error) | |
571 | return error; | |
8613e4c2 | 572 | |
ab4e0192 DT |
573 | if (copy_to_user(p, &ke, sizeof(ke))) |
574 | return -EFAULT; | |
8613e4c2 | 575 | |
8613e4c2 MCC |
576 | return 0; |
577 | } | |
578 | ||
ab4e0192 | 579 | static int evdev_handle_set_keycode(struct input_dev *dev, void __user *p) |
8613e4c2 | 580 | { |
ab4e0192 DT |
581 | struct input_keymap_entry ke = { |
582 | .len = sizeof(unsigned int), | |
583 | .flags = 0, | |
584 | }; | |
585 | int __user *ip = (int __user *)p; | |
8613e4c2 | 586 | |
ab4e0192 DT |
587 | if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) |
588 | return -EFAULT; | |
8613e4c2 | 589 | |
ab4e0192 DT |
590 | if (get_user(ke.keycode, ip + 1)) |
591 | return -EFAULT; | |
8613e4c2 | 592 | |
ab4e0192 DT |
593 | return input_set_keycode(dev, &ke); |
594 | } | |
8613e4c2 | 595 | |
ab4e0192 DT |
596 | static int evdev_handle_set_keycode_v2(struct input_dev *dev, void __user *p) |
597 | { | |
598 | struct input_keymap_entry ke; | |
8613e4c2 | 599 | |
ab4e0192 DT |
600 | if (copy_from_user(&ke, p, sizeof(ke))) |
601 | return -EFAULT; | |
8613e4c2 | 602 | |
ab4e0192 DT |
603 | if (ke.len > sizeof(ke.scancode)) |
604 | return -EINVAL; | |
8613e4c2 MCC |
605 | |
606 | return input_set_keycode(dev, &ke); | |
607 | } | |
608 | ||
6addb1d6 DT |
609 | static long evdev_do_ioctl(struct file *file, unsigned int cmd, |
610 | void __user *p, int compat_mode) | |
1da177e4 | 611 | { |
d0ffb9be DT |
612 | struct evdev_client *client = file->private_data; |
613 | struct evdev *evdev = client->evdev; | |
1da177e4 LT |
614 | struct input_dev *dev = evdev->handle.dev; |
615 | struct input_absinfo abs; | |
509ca1a9 | 616 | struct ff_effect effect; |
3a51f7c4 | 617 | int __user *ip = (int __user *)p; |
58b93995 | 618 | unsigned int i, t, u, v; |
448cd166 | 619 | unsigned int size; |
509ca1a9 | 620 | int error; |
1da177e4 | 621 | |
448cd166 | 622 | /* First we check for fixed-length commands */ |
1da177e4 LT |
623 | switch (cmd) { |
624 | ||
6addb1d6 DT |
625 | case EVIOCGVERSION: |
626 | return put_user(EV_VERSION, ip); | |
1da177e4 | 627 | |
6addb1d6 DT |
628 | case EVIOCGID: |
629 | if (copy_to_user(p, &dev->id, sizeof(struct input_id))) | |
630 | return -EFAULT; | |
631 | return 0; | |
08791e5c | 632 | |
6addb1d6 DT |
633 | case EVIOCGREP: |
634 | if (!test_bit(EV_REP, dev->evbit)) | |
635 | return -ENOSYS; | |
636 | if (put_user(dev->rep[REP_DELAY], ip)) | |
637 | return -EFAULT; | |
638 | if (put_user(dev->rep[REP_PERIOD], ip + 1)) | |
639 | return -EFAULT; | |
640 | return 0; | |
08791e5c | 641 | |
6addb1d6 DT |
642 | case EVIOCSREP: |
643 | if (!test_bit(EV_REP, dev->evbit)) | |
644 | return -ENOSYS; | |
645 | if (get_user(u, ip)) | |
646 | return -EFAULT; | |
647 | if (get_user(v, ip + 1)) | |
648 | return -EFAULT; | |
08791e5c | 649 | |
6addb1d6 DT |
650 | input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u); |
651 | input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v); | |
3a51f7c4 | 652 | |
6addb1d6 | 653 | return 0; |
1da177e4 | 654 | |
6addb1d6 DT |
655 | case EVIOCRMFF: |
656 | return input_ff_erase(dev, (int)(unsigned long) p, file); | |
1da177e4 | 657 | |
6addb1d6 DT |
658 | case EVIOCGEFFECTS: |
659 | i = test_bit(EV_FF, dev->evbit) ? | |
660 | dev->ff->max_effects : 0; | |
661 | if (put_user(i, ip)) | |
662 | return -EFAULT; | |
663 | return 0; | |
664 | ||
665 | case EVIOCGRAB: | |
666 | if (p) | |
667 | return evdev_grab(evdev, client); | |
668 | else | |
669 | return evdev_ungrab(evdev, client); | |
ab4e0192 DT |
670 | |
671 | case EVIOCGKEYCODE: | |
672 | return evdev_handle_get_keycode(dev, p); | |
673 | ||
674 | case EVIOCSKEYCODE: | |
675 | return evdev_handle_set_keycode(dev, p); | |
676 | ||
677 | case EVIOCGKEYCODE_V2: | |
678 | return evdev_handle_get_keycode_v2(dev, p); | |
679 | ||
680 | case EVIOCSKEYCODE_V2: | |
681 | return evdev_handle_set_keycode_v2(dev, p); | |
448cd166 | 682 | } |
1da177e4 | 683 | |
448cd166 | 684 | size = _IOC_SIZE(cmd); |
1da177e4 | 685 | |
448cd166 DT |
686 | /* Now check variable-length commands */ |
687 | #define EVIOC_MASK_SIZE(nr) ((nr) & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) | |
448cd166 | 688 | switch (EVIOC_MASK_SIZE(cmd)) { |
41e979f8 | 689 | |
85b77200 HR |
690 | case EVIOCGPROP(0): |
691 | return bits_to_user(dev->propbit, INPUT_PROP_MAX, | |
692 | size, p, compat_mode); | |
693 | ||
448cd166 DT |
694 | case EVIOCGKEY(0): |
695 | return bits_to_user(dev->key, KEY_MAX, size, p, compat_mode); | |
1da177e4 | 696 | |
448cd166 DT |
697 | case EVIOCGLED(0): |
698 | return bits_to_user(dev->led, LED_MAX, size, p, compat_mode); | |
1da177e4 | 699 | |
448cd166 DT |
700 | case EVIOCGSND(0): |
701 | return bits_to_user(dev->snd, SND_MAX, size, p, compat_mode); | |
1da177e4 | 702 | |
448cd166 DT |
703 | case EVIOCGSW(0): |
704 | return bits_to_user(dev->sw, SW_MAX, size, p, compat_mode); | |
31581066 | 705 | |
448cd166 DT |
706 | case EVIOCGNAME(0): |
707 | return str_to_user(dev->name, size, p); | |
1da177e4 | 708 | |
448cd166 DT |
709 | case EVIOCGPHYS(0): |
710 | return str_to_user(dev->phys, size, p); | |
1da177e4 | 711 | |
448cd166 DT |
712 | case EVIOCGUNIQ(0): |
713 | return str_to_user(dev->uniq, size, p); | |
1da177e4 | 714 | |
448cd166 DT |
715 | case EVIOC_MASK_SIZE(EVIOCSFF): |
716 | if (input_ff_effect_from_user(p, size, &effect)) | |
717 | return -EFAULT; | |
1da177e4 | 718 | |
448cd166 | 719 | error = input_ff_upload(dev, &effect, file); |
1da177e4 | 720 | |
448cd166 DT |
721 | if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) |
722 | return -EFAULT; | |
41e979f8 | 723 | |
448cd166 DT |
724 | return error; |
725 | } | |
1da177e4 | 726 | |
448cd166 DT |
727 | /* Multi-number variable-length handlers */ |
728 | if (_IOC_TYPE(cmd) != 'E') | |
729 | return -EINVAL; | |
1da177e4 | 730 | |
448cd166 | 731 | if (_IOC_DIR(cmd) == _IOC_READ) { |
6addb1d6 | 732 | |
448cd166 DT |
733 | if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0))) |
734 | return handle_eviocgbit(dev, | |
735 | _IOC_NR(cmd) & EV_MAX, size, | |
736 | p, compat_mode); | |
1da177e4 | 737 | |
448cd166 | 738 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { |
f2278f31 | 739 | |
0a74a1df DM |
740 | if (!dev->absinfo) |
741 | return -EINVAL; | |
742 | ||
448cd166 DT |
743 | t = _IOC_NR(cmd) & ABS_MAX; |
744 | abs = dev->absinfo[t]; | |
f2278f31 | 745 | |
448cd166 DT |
746 | if (copy_to_user(p, &abs, min_t(size_t, |
747 | size, sizeof(struct input_absinfo)))) | |
748 | return -EFAULT; | |
f2278f31 | 749 | |
448cd166 DT |
750 | return 0; |
751 | } | |
752 | } | |
f2278f31 | 753 | |
f9ce6eb5 | 754 | if (_IOC_DIR(cmd) == _IOC_WRITE) { |
f2278f31 | 755 | |
448cd166 | 756 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { |
1da177e4 | 757 | |
0a74a1df DM |
758 | if (!dev->absinfo) |
759 | return -EINVAL; | |
760 | ||
448cd166 | 761 | t = _IOC_NR(cmd) & ABS_MAX; |
41e979f8 | 762 | |
448cd166 DT |
763 | if (copy_from_user(&abs, p, min_t(size_t, |
764 | size, sizeof(struct input_absinfo)))) | |
765 | return -EFAULT; | |
1da177e4 | 766 | |
448cd166 DT |
767 | if (size < sizeof(struct input_absinfo)) |
768 | abs.resolution = 0; | |
d31b2865 | 769 | |
448cd166 DT |
770 | /* We can't change number of reserved MT slots */ |
771 | if (t == ABS_MT_SLOT) | |
772 | return -EINVAL; | |
40d007e7 | 773 | |
448cd166 DT |
774 | /* |
775 | * Take event lock to ensure that we are not | |
776 | * changing device parameters in the middle | |
777 | * of event. | |
778 | */ | |
779 | spin_lock_irq(&dev->event_lock); | |
780 | dev->absinfo[t] = abs; | |
781 | spin_unlock_irq(&dev->event_lock); | |
6addb1d6 | 782 | |
448cd166 | 783 | return 0; |
6addb1d6 | 784 | } |
1da177e4 | 785 | } |
448cd166 | 786 | |
1da177e4 LT |
787 | return -EINVAL; |
788 | } | |
1da177e4 | 789 | |
6addb1d6 DT |
790 | static long evdev_ioctl_handler(struct file *file, unsigned int cmd, |
791 | void __user *p, int compat_mode) | |
792 | { | |
793 | struct evdev_client *client = file->private_data; | |
794 | struct evdev *evdev = client->evdev; | |
795 | int retval; | |
796 | ||
797 | retval = mutex_lock_interruptible(&evdev->mutex); | |
798 | if (retval) | |
799 | return retval; | |
800 | ||
801 | if (!evdev->exist) { | |
802 | retval = -ENODEV; | |
803 | goto out; | |
804 | } | |
805 | ||
806 | retval = evdev_do_ioctl(file, cmd, p, compat_mode); | |
807 | ||
808 | out: | |
809 | mutex_unlock(&evdev->mutex); | |
810 | return retval; | |
811 | } | |
812 | ||
3a51f7c4 DT |
813 | static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
814 | { | |
815 | return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0); | |
816 | } | |
41e979f8 | 817 | |
3a51f7c4 | 818 | #ifdef CONFIG_COMPAT |
6addb1d6 DT |
819 | static long evdev_ioctl_compat(struct file *file, |
820 | unsigned int cmd, unsigned long arg) | |
52658bb6 | 821 | { |
3a51f7c4 | 822 | return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1); |
1da177e4 | 823 | } |
52658bb6 | 824 | #endif |
1da177e4 | 825 | |
66e66118 | 826 | static const struct file_operations evdev_fops = { |
6addb1d6 DT |
827 | .owner = THIS_MODULE, |
828 | .read = evdev_read, | |
829 | .write = evdev_write, | |
830 | .poll = evdev_poll, | |
831 | .open = evdev_open, | |
832 | .release = evdev_release, | |
833 | .unlocked_ioctl = evdev_ioctl, | |
52658bb6 | 834 | #ifdef CONFIG_COMPAT |
6addb1d6 | 835 | .compat_ioctl = evdev_ioctl_compat, |
52658bb6 | 836 | #endif |
6addb1d6 | 837 | .fasync = evdev_fasync, |
6038f373 AB |
838 | .flush = evdev_flush, |
839 | .llseek = no_llseek, | |
1da177e4 LT |
840 | }; |
841 | ||
6addb1d6 DT |
842 | static int evdev_install_chrdev(struct evdev *evdev) |
843 | { | |
844 | /* | |
845 | * No need to do any locking here as calls to connect and | |
846 | * disconnect are serialized by the input core | |
847 | */ | |
848 | evdev_table[evdev->minor] = evdev; | |
849 | return 0; | |
850 | } | |
851 | ||
852 | static void evdev_remove_chrdev(struct evdev *evdev) | |
853 | { | |
854 | /* | |
855 | * Lock evdev table to prevent race with evdev_open() | |
856 | */ | |
857 | mutex_lock(&evdev_table_mutex); | |
858 | evdev_table[evdev->minor] = NULL; | |
859 | mutex_unlock(&evdev_table_mutex); | |
860 | } | |
861 | ||
862 | /* | |
863 | * Mark device non-existent. This disables writes, ioctls and | |
864 | * prevents new users from opening the device. Already posted | |
865 | * blocking reads will stay, however new ones will fail. | |
866 | */ | |
867 | static void evdev_mark_dead(struct evdev *evdev) | |
868 | { | |
869 | mutex_lock(&evdev->mutex); | |
20da92de | 870 | evdev->exist = false; |
6addb1d6 DT |
871 | mutex_unlock(&evdev->mutex); |
872 | } | |
873 | ||
874 | static void evdev_cleanup(struct evdev *evdev) | |
875 | { | |
876 | struct input_handle *handle = &evdev->handle; | |
877 | ||
878 | evdev_mark_dead(evdev); | |
879 | evdev_hangup(evdev); | |
880 | evdev_remove_chrdev(evdev); | |
881 | ||
882 | /* evdev is marked dead so no one else accesses evdev->open */ | |
883 | if (evdev->open) { | |
884 | input_flush_device(handle, NULL); | |
885 | input_close_device(handle); | |
886 | } | |
887 | } | |
888 | ||
889 | /* | |
890 | * Create new evdev device. Note that input core serializes calls | |
891 | * to connect and disconnect so we don't need to lock evdev_table here. | |
892 | */ | |
5b2a0826 DT |
893 | static int evdev_connect(struct input_handler *handler, struct input_dev *dev, |
894 | const struct input_device_id *id) | |
1da177e4 LT |
895 | { |
896 | struct evdev *evdev; | |
897 | int minor; | |
5b2a0826 | 898 | int error; |
1da177e4 | 899 | |
6addb1d6 DT |
900 | for (minor = 0; minor < EVDEV_MINORS; minor++) |
901 | if (!evdev_table[minor]) | |
902 | break; | |
903 | ||
1da177e4 | 904 | if (minor == EVDEV_MINORS) { |
da0c4901 | 905 | pr_err("no more free evdev devices\n"); |
5b2a0826 | 906 | return -ENFILE; |
1da177e4 LT |
907 | } |
908 | ||
5b2a0826 DT |
909 | evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL); |
910 | if (!evdev) | |
911 | return -ENOMEM; | |
1da177e4 | 912 | |
d0ffb9be | 913 | INIT_LIST_HEAD(&evdev->client_list); |
6addb1d6 DT |
914 | spin_lock_init(&evdev->client_lock); |
915 | mutex_init(&evdev->mutex); | |
1da177e4 LT |
916 | init_waitqueue_head(&evdev->wait); |
917 | ||
3d5cb60e | 918 | dev_set_name(&evdev->dev, "event%d", minor); |
20da92de | 919 | evdev->exist = true; |
1da177e4 | 920 | evdev->minor = minor; |
6addb1d6 | 921 | |
a7097ff8 | 922 | evdev->handle.dev = input_get_device(dev); |
3d5cb60e | 923 | evdev->handle.name = dev_name(&evdev->dev); |
1da177e4 LT |
924 | evdev->handle.handler = handler; |
925 | evdev->handle.private = evdev; | |
1da177e4 | 926 | |
6addb1d6 | 927 | evdev->dev.devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor); |
9657d75c DT |
928 | evdev->dev.class = &input_class; |
929 | evdev->dev.parent = &dev->dev; | |
9657d75c DT |
930 | evdev->dev.release = evdev_free; |
931 | device_initialize(&evdev->dev); | |
5b2a0826 | 932 | |
6addb1d6 | 933 | error = input_register_handle(&evdev->handle); |
5b2a0826 | 934 | if (error) |
9657d75c | 935 | goto err_free_evdev; |
5b2a0826 | 936 | |
6addb1d6 DT |
937 | error = evdev_install_chrdev(evdev); |
938 | if (error) | |
939 | goto err_unregister_handle; | |
940 | ||
941 | error = device_add(&evdev->dev); | |
5b2a0826 | 942 | if (error) |
6addb1d6 | 943 | goto err_cleanup_evdev; |
1da177e4 | 944 | |
5b2a0826 | 945 | return 0; |
1da177e4 | 946 | |
6addb1d6 DT |
947 | err_cleanup_evdev: |
948 | evdev_cleanup(evdev); | |
949 | err_unregister_handle: | |
950 | input_unregister_handle(&evdev->handle); | |
5b2a0826 | 951 | err_free_evdev: |
9657d75c | 952 | put_device(&evdev->dev); |
5b2a0826 | 953 | return error; |
1da177e4 LT |
954 | } |
955 | ||
956 | static void evdev_disconnect(struct input_handle *handle) | |
957 | { | |
958 | struct evdev *evdev = handle->private; | |
1da177e4 | 959 | |
9657d75c | 960 | device_del(&evdev->dev); |
6addb1d6 DT |
961 | evdev_cleanup(evdev); |
962 | input_unregister_handle(handle); | |
9657d75c | 963 | put_device(&evdev->dev); |
1da177e4 LT |
964 | } |
965 | ||
66e66118 | 966 | static const struct input_device_id evdev_ids[] = { |
1da177e4 LT |
967 | { .driver_info = 1 }, /* Matches all devices */ |
968 | { }, /* Terminating zero entry */ | |
969 | }; | |
970 | ||
971 | MODULE_DEVICE_TABLE(input, evdev_ids); | |
972 | ||
973 | static struct input_handler evdev_handler = { | |
6addb1d6 DT |
974 | .event = evdev_event, |
975 | .connect = evdev_connect, | |
976 | .disconnect = evdev_disconnect, | |
977 | .fops = &evdev_fops, | |
978 | .minor = EVDEV_MINOR_BASE, | |
979 | .name = "evdev", | |
980 | .id_table = evdev_ids, | |
1da177e4 LT |
981 | }; |
982 | ||
983 | static int __init evdev_init(void) | |
984 | { | |
4263cf0f | 985 | return input_register_handler(&evdev_handler); |
1da177e4 LT |
986 | } |
987 | ||
988 | static void __exit evdev_exit(void) | |
989 | { | |
990 | input_unregister_handler(&evdev_handler); | |
991 | } | |
992 | ||
993 | module_init(evdev_init); | |
994 | module_exit(evdev_exit); | |
995 | ||
996 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
997 | MODULE_DESCRIPTION("Input driver event char devices"); | |
998 | MODULE_LICENSE("GPL"); |