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 | |
439581ec PK |
324 | if (count < input_event_size()) |
325 | return -EINVAL; | |
326 | ||
6addb1d6 DT |
327 | retval = mutex_lock_interruptible(&evdev->mutex); |
328 | if (retval) | |
329 | return retval; | |
330 | ||
331 | if (!evdev->exist) { | |
332 | retval = -ENODEV; | |
333 | goto out; | |
334 | } | |
52658bb6 | 335 | |
439581ec | 336 | do { |
2d56f3a3 | 337 | if (input_event_from_user(buffer + retval, &event)) { |
6addb1d6 DT |
338 | retval = -EFAULT; |
339 | goto out; | |
340 | } | |
439581ec | 341 | retval += input_event_size(); |
6addb1d6 DT |
342 | |
343 | input_inject_event(&evdev->handle, | |
344 | event.type, event.code, event.value); | |
439581ec | 345 | } while (retval + input_event_size() <= count); |
52658bb6 | 346 | |
6addb1d6 DT |
347 | out: |
348 | mutex_unlock(&evdev->mutex); | |
52658bb6 JK |
349 | return retval; |
350 | } | |
52658bb6 | 351 | |
6addb1d6 DT |
352 | static int evdev_fetch_next_event(struct evdev_client *client, |
353 | struct input_event *event) | |
354 | { | |
355 | int have_event; | |
356 | ||
357 | spin_lock_irq(&client->buffer_lock); | |
358 | ||
359 | have_event = client->head != client->tail; | |
360 | if (have_event) { | |
361 | *event = client->buffer[client->tail++]; | |
b58f7086 | 362 | client->tail &= client->bufsize - 1; |
6addb1d6 DT |
363 | } |
364 | ||
365 | spin_unlock_irq(&client->buffer_lock); | |
366 | ||
367 | return have_event; | |
368 | } | |
369 | ||
370 | static ssize_t evdev_read(struct file *file, char __user *buffer, | |
371 | size_t count, loff_t *ppos) | |
1da177e4 | 372 | { |
d0ffb9be DT |
373 | struct evdev_client *client = file->private_data; |
374 | struct evdev *evdev = client->evdev; | |
6addb1d6 | 375 | struct input_event event; |
1da177e4 LT |
376 | int retval; |
377 | ||
2d56f3a3 | 378 | if (count < input_event_size()) |
1da177e4 LT |
379 | return -EINVAL; |
380 | ||
6addb1d6 DT |
381 | if (client->head == client->tail && evdev->exist && |
382 | (file->f_flags & O_NONBLOCK)) | |
1da177e4 LT |
383 | return -EAGAIN; |
384 | ||
d0ffb9be DT |
385 | retval = wait_event_interruptible(evdev->wait, |
386 | client->head != client->tail || !evdev->exist); | |
1da177e4 LT |
387 | if (retval) |
388 | return retval; | |
389 | ||
d0ffb9be | 390 | if (!evdev->exist) |
1da177e4 LT |
391 | return -ENODEV; |
392 | ||
2d56f3a3 | 393 | while (retval + input_event_size() <= count && |
6addb1d6 | 394 | evdev_fetch_next_event(client, &event)) { |
3a51f7c4 | 395 | |
2d56f3a3 | 396 | if (input_event_to_user(buffer + retval, &event)) |
3a51f7c4 DT |
397 | return -EFAULT; |
398 | ||
2d56f3a3 | 399 | retval += input_event_size(); |
1da177e4 LT |
400 | } |
401 | ||
402 | return retval; | |
403 | } | |
404 | ||
405 | /* No kernel lock - fine */ | |
406 | static unsigned int evdev_poll(struct file *file, poll_table *wait) | |
407 | { | |
d0ffb9be DT |
408 | struct evdev_client *client = file->private_data; |
409 | struct evdev *evdev = client->evdev; | |
c18fb139 | 410 | unsigned int mask; |
1e0afb28 | 411 | |
d0ffb9be | 412 | poll_wait(file, &evdev->wait, wait); |
c18fb139 DT |
413 | |
414 | mask = evdev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR; | |
415 | if (client->head != client->tail) | |
416 | mask |= POLLIN | POLLRDNORM; | |
417 | ||
418 | return mask; | |
1da177e4 LT |
419 | } |
420 | ||
3a51f7c4 DT |
421 | #ifdef CONFIG_COMPAT |
422 | ||
423 | #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) | |
7b19ada2 | 424 | #define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1) |
3a51f7c4 DT |
425 | |
426 | #ifdef __BIG_ENDIAN | |
427 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
428 | unsigned int maxlen, void __user *p, int compat) | |
429 | { | |
430 | int len, i; | |
431 | ||
432 | if (compat) { | |
7b19ada2 | 433 | len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t); |
bf61f8d3 | 434 | if (len > maxlen) |
3a51f7c4 DT |
435 | len = maxlen; |
436 | ||
437 | for (i = 0; i < len / sizeof(compat_long_t); i++) | |
438 | if (copy_to_user((compat_long_t __user *) p + i, | |
439 | (compat_long_t *) bits + | |
440 | i + 1 - ((i % 2) << 1), | |
441 | sizeof(compat_long_t))) | |
442 | return -EFAULT; | |
443 | } else { | |
7b19ada2 | 444 | len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
445 | if (len > maxlen) |
446 | len = maxlen; | |
447 | ||
448 | if (copy_to_user(p, bits, len)) | |
449 | return -EFAULT; | |
450 | } | |
451 | ||
452 | return len; | |
453 | } | |
454 | #else | |
455 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
456 | unsigned int maxlen, void __user *p, int compat) | |
457 | { | |
458 | int len = compat ? | |
7b19ada2 JS |
459 | BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) : |
460 | BITS_TO_LONGS(maxbit) * sizeof(long); | |
3a51f7c4 DT |
461 | |
462 | if (len > maxlen) | |
463 | len = maxlen; | |
464 | ||
465 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
466 | } | |
467 | #endif /* __BIG_ENDIAN */ | |
468 | ||
469 | #else | |
470 | ||
471 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
472 | unsigned int maxlen, void __user *p, int compat) | |
473 | { | |
7b19ada2 | 474 | int len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
475 | |
476 | if (len > maxlen) | |
477 | len = maxlen; | |
478 | ||
479 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
480 | } | |
481 | ||
482 | #endif /* CONFIG_COMPAT */ | |
483 | ||
484 | static int str_to_user(const char *str, unsigned int maxlen, void __user *p) | |
485 | { | |
486 | int len; | |
487 | ||
488 | if (!str) | |
489 | return -ENOENT; | |
490 | ||
491 | len = strlen(str) + 1; | |
492 | if (len > maxlen) | |
493 | len = maxlen; | |
494 | ||
495 | return copy_to_user(p, str, len) ? -EFAULT : len; | |
496 | } | |
497 | ||
f2afa771 | 498 | #define OLD_KEY_MAX 0x1ff |
448cd166 DT |
499 | static int handle_eviocgbit(struct input_dev *dev, |
500 | unsigned int type, unsigned int size, | |
501 | void __user *p, int compat_mode) | |
5402a734 | 502 | { |
f2afa771 | 503 | static unsigned long keymax_warn_time; |
5402a734 LT |
504 | unsigned long *bits; |
505 | int len; | |
506 | ||
448cd166 | 507 | switch (type) { |
5402a734 LT |
508 | |
509 | case 0: bits = dev->evbit; len = EV_MAX; break; | |
510 | case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; | |
511 | case EV_REL: bits = dev->relbit; len = REL_MAX; break; | |
512 | case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; | |
513 | case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; | |
514 | case EV_LED: bits = dev->ledbit; len = LED_MAX; break; | |
515 | case EV_SND: bits = dev->sndbit; len = SND_MAX; break; | |
516 | case EV_FF: bits = dev->ffbit; len = FF_MAX; break; | |
517 | case EV_SW: bits = dev->swbit; len = SW_MAX; break; | |
518 | default: return -EINVAL; | |
519 | } | |
f2afa771 DT |
520 | |
521 | /* | |
522 | * Work around bugs in userspace programs that like to do | |
523 | * EVIOCGBIT(EV_KEY, KEY_MAX) and not realize that 'len' | |
524 | * should be in bytes, not in bits. | |
525 | */ | |
448cd166 | 526 | if (type == EV_KEY && size == OLD_KEY_MAX) { |
f2afa771 DT |
527 | len = OLD_KEY_MAX; |
528 | if (printk_timed_ratelimit(&keymax_warn_time, 10 * 1000)) | |
da0c4901 JP |
529 | pr_warning("(EVIOCGBIT): Suspicious buffer size %u, " |
530 | "limiting output to %zu bytes. See " | |
531 | "http://userweb.kernel.org/~dtor/eviocgbit-bug.html\n", | |
532 | OLD_KEY_MAX, | |
533 | BITS_TO_LONGS(OLD_KEY_MAX) * sizeof(long)); | |
f2afa771 DT |
534 | } |
535 | ||
448cd166 | 536 | return bits_to_user(bits, len, size, p, compat_mode); |
5402a734 | 537 | } |
f2afa771 | 538 | #undef OLD_KEY_MAX |
5402a734 | 539 | |
ab4e0192 | 540 | static int evdev_handle_get_keycode(struct input_dev *dev, void __user *p) |
8613e4c2 | 541 | { |
ab4e0192 DT |
542 | struct input_keymap_entry ke = { |
543 | .len = sizeof(unsigned int), | |
544 | .flags = 0, | |
545 | }; | |
546 | int __user *ip = (int __user *)p; | |
8613e4c2 MCC |
547 | int error; |
548 | ||
ab4e0192 DT |
549 | /* legacy case */ |
550 | if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) | |
551 | return -EFAULT; | |
8613e4c2 | 552 | |
ab4e0192 DT |
553 | error = input_get_keycode(dev, &ke); |
554 | if (error) | |
555 | return error; | |
8613e4c2 | 556 | |
ab4e0192 DT |
557 | if (put_user(ke.keycode, ip + 1)) |
558 | return -EFAULT; | |
8613e4c2 | 559 | |
ab4e0192 DT |
560 | return 0; |
561 | } | |
8613e4c2 | 562 | |
ab4e0192 DT |
563 | static int evdev_handle_get_keycode_v2(struct input_dev *dev, void __user *p) |
564 | { | |
565 | struct input_keymap_entry ke; | |
566 | int error; | |
8613e4c2 | 567 | |
ab4e0192 DT |
568 | if (copy_from_user(&ke, p, sizeof(ke))) |
569 | return -EFAULT; | |
8613e4c2 | 570 | |
ab4e0192 DT |
571 | error = input_get_keycode(dev, &ke); |
572 | if (error) | |
573 | return error; | |
8613e4c2 | 574 | |
ab4e0192 DT |
575 | if (copy_to_user(p, &ke, sizeof(ke))) |
576 | return -EFAULT; | |
8613e4c2 | 577 | |
8613e4c2 MCC |
578 | return 0; |
579 | } | |
580 | ||
ab4e0192 | 581 | static int evdev_handle_set_keycode(struct input_dev *dev, void __user *p) |
8613e4c2 | 582 | { |
ab4e0192 DT |
583 | struct input_keymap_entry ke = { |
584 | .len = sizeof(unsigned int), | |
585 | .flags = 0, | |
586 | }; | |
587 | int __user *ip = (int __user *)p; | |
8613e4c2 | 588 | |
ab4e0192 DT |
589 | if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) |
590 | return -EFAULT; | |
8613e4c2 | 591 | |
ab4e0192 DT |
592 | if (get_user(ke.keycode, ip + 1)) |
593 | return -EFAULT; | |
8613e4c2 | 594 | |
ab4e0192 DT |
595 | return input_set_keycode(dev, &ke); |
596 | } | |
8613e4c2 | 597 | |
ab4e0192 DT |
598 | static int evdev_handle_set_keycode_v2(struct input_dev *dev, void __user *p) |
599 | { | |
600 | struct input_keymap_entry ke; | |
8613e4c2 | 601 | |
ab4e0192 DT |
602 | if (copy_from_user(&ke, p, sizeof(ke))) |
603 | return -EFAULT; | |
8613e4c2 | 604 | |
ab4e0192 DT |
605 | if (ke.len > sizeof(ke.scancode)) |
606 | return -EINVAL; | |
8613e4c2 MCC |
607 | |
608 | return input_set_keycode(dev, &ke); | |
609 | } | |
610 | ||
6addb1d6 DT |
611 | static long evdev_do_ioctl(struct file *file, unsigned int cmd, |
612 | void __user *p, int compat_mode) | |
1da177e4 | 613 | { |
d0ffb9be DT |
614 | struct evdev_client *client = file->private_data; |
615 | struct evdev *evdev = client->evdev; | |
1da177e4 LT |
616 | struct input_dev *dev = evdev->handle.dev; |
617 | struct input_absinfo abs; | |
509ca1a9 | 618 | struct ff_effect effect; |
3a51f7c4 | 619 | int __user *ip = (int __user *)p; |
58b93995 | 620 | unsigned int i, t, u, v; |
448cd166 | 621 | unsigned int size; |
509ca1a9 | 622 | int error; |
1da177e4 | 623 | |
448cd166 | 624 | /* First we check for fixed-length commands */ |
1da177e4 LT |
625 | switch (cmd) { |
626 | ||
6addb1d6 DT |
627 | case EVIOCGVERSION: |
628 | return put_user(EV_VERSION, ip); | |
1da177e4 | 629 | |
6addb1d6 DT |
630 | case EVIOCGID: |
631 | if (copy_to_user(p, &dev->id, sizeof(struct input_id))) | |
632 | return -EFAULT; | |
633 | return 0; | |
08791e5c | 634 | |
6addb1d6 DT |
635 | case EVIOCGREP: |
636 | if (!test_bit(EV_REP, dev->evbit)) | |
637 | return -ENOSYS; | |
638 | if (put_user(dev->rep[REP_DELAY], ip)) | |
639 | return -EFAULT; | |
640 | if (put_user(dev->rep[REP_PERIOD], ip + 1)) | |
641 | return -EFAULT; | |
642 | return 0; | |
08791e5c | 643 | |
6addb1d6 DT |
644 | case EVIOCSREP: |
645 | if (!test_bit(EV_REP, dev->evbit)) | |
646 | return -ENOSYS; | |
647 | if (get_user(u, ip)) | |
648 | return -EFAULT; | |
649 | if (get_user(v, ip + 1)) | |
650 | return -EFAULT; | |
08791e5c | 651 | |
6addb1d6 DT |
652 | input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u); |
653 | input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v); | |
3a51f7c4 | 654 | |
6addb1d6 | 655 | return 0; |
1da177e4 | 656 | |
6addb1d6 DT |
657 | case EVIOCRMFF: |
658 | return input_ff_erase(dev, (int)(unsigned long) p, file); | |
1da177e4 | 659 | |
6addb1d6 DT |
660 | case EVIOCGEFFECTS: |
661 | i = test_bit(EV_FF, dev->evbit) ? | |
662 | dev->ff->max_effects : 0; | |
663 | if (put_user(i, ip)) | |
664 | return -EFAULT; | |
665 | return 0; | |
666 | ||
667 | case EVIOCGRAB: | |
668 | if (p) | |
669 | return evdev_grab(evdev, client); | |
670 | else | |
671 | return evdev_ungrab(evdev, client); | |
ab4e0192 DT |
672 | |
673 | case EVIOCGKEYCODE: | |
674 | return evdev_handle_get_keycode(dev, p); | |
675 | ||
676 | case EVIOCSKEYCODE: | |
677 | return evdev_handle_set_keycode(dev, p); | |
678 | ||
679 | case EVIOCGKEYCODE_V2: | |
680 | return evdev_handle_get_keycode_v2(dev, p); | |
681 | ||
682 | case EVIOCSKEYCODE_V2: | |
683 | return evdev_handle_set_keycode_v2(dev, p); | |
448cd166 | 684 | } |
1da177e4 | 685 | |
448cd166 | 686 | size = _IOC_SIZE(cmd); |
1da177e4 | 687 | |
448cd166 DT |
688 | /* Now check variable-length commands */ |
689 | #define EVIOC_MASK_SIZE(nr) ((nr) & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) | |
448cd166 | 690 | switch (EVIOC_MASK_SIZE(cmd)) { |
41e979f8 | 691 | |
85b77200 HR |
692 | case EVIOCGPROP(0): |
693 | return bits_to_user(dev->propbit, INPUT_PROP_MAX, | |
694 | size, p, compat_mode); | |
695 | ||
448cd166 DT |
696 | case EVIOCGKEY(0): |
697 | return bits_to_user(dev->key, KEY_MAX, size, p, compat_mode); | |
1da177e4 | 698 | |
448cd166 DT |
699 | case EVIOCGLED(0): |
700 | return bits_to_user(dev->led, LED_MAX, size, p, compat_mode); | |
1da177e4 | 701 | |
448cd166 DT |
702 | case EVIOCGSND(0): |
703 | return bits_to_user(dev->snd, SND_MAX, size, p, compat_mode); | |
1da177e4 | 704 | |
448cd166 DT |
705 | case EVIOCGSW(0): |
706 | return bits_to_user(dev->sw, SW_MAX, size, p, compat_mode); | |
31581066 | 707 | |
448cd166 DT |
708 | case EVIOCGNAME(0): |
709 | return str_to_user(dev->name, size, p); | |
1da177e4 | 710 | |
448cd166 DT |
711 | case EVIOCGPHYS(0): |
712 | return str_to_user(dev->phys, size, p); | |
1da177e4 | 713 | |
448cd166 DT |
714 | case EVIOCGUNIQ(0): |
715 | return str_to_user(dev->uniq, size, p); | |
1da177e4 | 716 | |
448cd166 DT |
717 | case EVIOC_MASK_SIZE(EVIOCSFF): |
718 | if (input_ff_effect_from_user(p, size, &effect)) | |
719 | return -EFAULT; | |
1da177e4 | 720 | |
448cd166 | 721 | error = input_ff_upload(dev, &effect, file); |
1da177e4 | 722 | |
448cd166 DT |
723 | if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) |
724 | return -EFAULT; | |
41e979f8 | 725 | |
448cd166 DT |
726 | return error; |
727 | } | |
1da177e4 | 728 | |
448cd166 DT |
729 | /* Multi-number variable-length handlers */ |
730 | if (_IOC_TYPE(cmd) != 'E') | |
731 | return -EINVAL; | |
1da177e4 | 732 | |
448cd166 | 733 | if (_IOC_DIR(cmd) == _IOC_READ) { |
6addb1d6 | 734 | |
448cd166 DT |
735 | if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0))) |
736 | return handle_eviocgbit(dev, | |
737 | _IOC_NR(cmd) & EV_MAX, size, | |
738 | p, compat_mode); | |
1da177e4 | 739 | |
448cd166 | 740 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { |
f2278f31 | 741 | |
0a74a1df DM |
742 | if (!dev->absinfo) |
743 | return -EINVAL; | |
744 | ||
448cd166 DT |
745 | t = _IOC_NR(cmd) & ABS_MAX; |
746 | abs = dev->absinfo[t]; | |
f2278f31 | 747 | |
448cd166 DT |
748 | if (copy_to_user(p, &abs, min_t(size_t, |
749 | size, sizeof(struct input_absinfo)))) | |
750 | return -EFAULT; | |
f2278f31 | 751 | |
448cd166 DT |
752 | return 0; |
753 | } | |
754 | } | |
f2278f31 | 755 | |
f9ce6eb5 | 756 | if (_IOC_DIR(cmd) == _IOC_WRITE) { |
f2278f31 | 757 | |
448cd166 | 758 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { |
1da177e4 | 759 | |
0a74a1df DM |
760 | if (!dev->absinfo) |
761 | return -EINVAL; | |
762 | ||
448cd166 | 763 | t = _IOC_NR(cmd) & ABS_MAX; |
41e979f8 | 764 | |
448cd166 DT |
765 | if (copy_from_user(&abs, p, min_t(size_t, |
766 | size, sizeof(struct input_absinfo)))) | |
767 | return -EFAULT; | |
1da177e4 | 768 | |
448cd166 DT |
769 | if (size < sizeof(struct input_absinfo)) |
770 | abs.resolution = 0; | |
d31b2865 | 771 | |
448cd166 DT |
772 | /* We can't change number of reserved MT slots */ |
773 | if (t == ABS_MT_SLOT) | |
774 | return -EINVAL; | |
40d007e7 | 775 | |
448cd166 DT |
776 | /* |
777 | * Take event lock to ensure that we are not | |
778 | * changing device parameters in the middle | |
779 | * of event. | |
780 | */ | |
781 | spin_lock_irq(&dev->event_lock); | |
782 | dev->absinfo[t] = abs; | |
783 | spin_unlock_irq(&dev->event_lock); | |
6addb1d6 | 784 | |
448cd166 | 785 | return 0; |
6addb1d6 | 786 | } |
1da177e4 | 787 | } |
448cd166 | 788 | |
1da177e4 LT |
789 | return -EINVAL; |
790 | } | |
1da177e4 | 791 | |
6addb1d6 DT |
792 | static long evdev_ioctl_handler(struct file *file, unsigned int cmd, |
793 | void __user *p, int compat_mode) | |
794 | { | |
795 | struct evdev_client *client = file->private_data; | |
796 | struct evdev *evdev = client->evdev; | |
797 | int retval; | |
798 | ||
799 | retval = mutex_lock_interruptible(&evdev->mutex); | |
800 | if (retval) | |
801 | return retval; | |
802 | ||
803 | if (!evdev->exist) { | |
804 | retval = -ENODEV; | |
805 | goto out; | |
806 | } | |
807 | ||
808 | retval = evdev_do_ioctl(file, cmd, p, compat_mode); | |
809 | ||
810 | out: | |
811 | mutex_unlock(&evdev->mutex); | |
812 | return retval; | |
813 | } | |
814 | ||
3a51f7c4 DT |
815 | static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
816 | { | |
817 | return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0); | |
818 | } | |
41e979f8 | 819 | |
3a51f7c4 | 820 | #ifdef CONFIG_COMPAT |
6addb1d6 DT |
821 | static long evdev_ioctl_compat(struct file *file, |
822 | unsigned int cmd, unsigned long arg) | |
52658bb6 | 823 | { |
3a51f7c4 | 824 | return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1); |
1da177e4 | 825 | } |
52658bb6 | 826 | #endif |
1da177e4 | 827 | |
66e66118 | 828 | static const struct file_operations evdev_fops = { |
6addb1d6 DT |
829 | .owner = THIS_MODULE, |
830 | .read = evdev_read, | |
831 | .write = evdev_write, | |
832 | .poll = evdev_poll, | |
833 | .open = evdev_open, | |
834 | .release = evdev_release, | |
835 | .unlocked_ioctl = evdev_ioctl, | |
52658bb6 | 836 | #ifdef CONFIG_COMPAT |
6addb1d6 | 837 | .compat_ioctl = evdev_ioctl_compat, |
52658bb6 | 838 | #endif |
6addb1d6 | 839 | .fasync = evdev_fasync, |
6038f373 AB |
840 | .flush = evdev_flush, |
841 | .llseek = no_llseek, | |
1da177e4 LT |
842 | }; |
843 | ||
6addb1d6 DT |
844 | static int evdev_install_chrdev(struct evdev *evdev) |
845 | { | |
846 | /* | |
847 | * No need to do any locking here as calls to connect and | |
848 | * disconnect are serialized by the input core | |
849 | */ | |
850 | evdev_table[evdev->minor] = evdev; | |
851 | return 0; | |
852 | } | |
853 | ||
854 | static void evdev_remove_chrdev(struct evdev *evdev) | |
855 | { | |
856 | /* | |
857 | * Lock evdev table to prevent race with evdev_open() | |
858 | */ | |
859 | mutex_lock(&evdev_table_mutex); | |
860 | evdev_table[evdev->minor] = NULL; | |
861 | mutex_unlock(&evdev_table_mutex); | |
862 | } | |
863 | ||
864 | /* | |
865 | * Mark device non-existent. This disables writes, ioctls and | |
866 | * prevents new users from opening the device. Already posted | |
867 | * blocking reads will stay, however new ones will fail. | |
868 | */ | |
869 | static void evdev_mark_dead(struct evdev *evdev) | |
870 | { | |
871 | mutex_lock(&evdev->mutex); | |
20da92de | 872 | evdev->exist = false; |
6addb1d6 DT |
873 | mutex_unlock(&evdev->mutex); |
874 | } | |
875 | ||
876 | static void evdev_cleanup(struct evdev *evdev) | |
877 | { | |
878 | struct input_handle *handle = &evdev->handle; | |
879 | ||
880 | evdev_mark_dead(evdev); | |
881 | evdev_hangup(evdev); | |
882 | evdev_remove_chrdev(evdev); | |
883 | ||
884 | /* evdev is marked dead so no one else accesses evdev->open */ | |
885 | if (evdev->open) { | |
886 | input_flush_device(handle, NULL); | |
887 | input_close_device(handle); | |
888 | } | |
889 | } | |
890 | ||
891 | /* | |
892 | * Create new evdev device. Note that input core serializes calls | |
893 | * to connect and disconnect so we don't need to lock evdev_table here. | |
894 | */ | |
5b2a0826 DT |
895 | static int evdev_connect(struct input_handler *handler, struct input_dev *dev, |
896 | const struct input_device_id *id) | |
1da177e4 LT |
897 | { |
898 | struct evdev *evdev; | |
899 | int minor; | |
5b2a0826 | 900 | int error; |
1da177e4 | 901 | |
6addb1d6 DT |
902 | for (minor = 0; minor < EVDEV_MINORS; minor++) |
903 | if (!evdev_table[minor]) | |
904 | break; | |
905 | ||
1da177e4 | 906 | if (minor == EVDEV_MINORS) { |
da0c4901 | 907 | pr_err("no more free evdev devices\n"); |
5b2a0826 | 908 | return -ENFILE; |
1da177e4 LT |
909 | } |
910 | ||
5b2a0826 DT |
911 | evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL); |
912 | if (!evdev) | |
913 | return -ENOMEM; | |
1da177e4 | 914 | |
d0ffb9be | 915 | INIT_LIST_HEAD(&evdev->client_list); |
6addb1d6 DT |
916 | spin_lock_init(&evdev->client_lock); |
917 | mutex_init(&evdev->mutex); | |
1da177e4 LT |
918 | init_waitqueue_head(&evdev->wait); |
919 | ||
3d5cb60e | 920 | dev_set_name(&evdev->dev, "event%d", minor); |
20da92de | 921 | evdev->exist = true; |
1da177e4 | 922 | evdev->minor = minor; |
6addb1d6 | 923 | |
a7097ff8 | 924 | evdev->handle.dev = input_get_device(dev); |
3d5cb60e | 925 | evdev->handle.name = dev_name(&evdev->dev); |
1da177e4 LT |
926 | evdev->handle.handler = handler; |
927 | evdev->handle.private = evdev; | |
1da177e4 | 928 | |
6addb1d6 | 929 | evdev->dev.devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor); |
9657d75c DT |
930 | evdev->dev.class = &input_class; |
931 | evdev->dev.parent = &dev->dev; | |
9657d75c DT |
932 | evdev->dev.release = evdev_free; |
933 | device_initialize(&evdev->dev); | |
5b2a0826 | 934 | |
6addb1d6 | 935 | error = input_register_handle(&evdev->handle); |
5b2a0826 | 936 | if (error) |
9657d75c | 937 | goto err_free_evdev; |
5b2a0826 | 938 | |
6addb1d6 DT |
939 | error = evdev_install_chrdev(evdev); |
940 | if (error) | |
941 | goto err_unregister_handle; | |
942 | ||
943 | error = device_add(&evdev->dev); | |
5b2a0826 | 944 | if (error) |
6addb1d6 | 945 | goto err_cleanup_evdev; |
1da177e4 | 946 | |
5b2a0826 | 947 | return 0; |
1da177e4 | 948 | |
6addb1d6 DT |
949 | err_cleanup_evdev: |
950 | evdev_cleanup(evdev); | |
951 | err_unregister_handle: | |
952 | input_unregister_handle(&evdev->handle); | |
5b2a0826 | 953 | err_free_evdev: |
9657d75c | 954 | put_device(&evdev->dev); |
5b2a0826 | 955 | return error; |
1da177e4 LT |
956 | } |
957 | ||
958 | static void evdev_disconnect(struct input_handle *handle) | |
959 | { | |
960 | struct evdev *evdev = handle->private; | |
1da177e4 | 961 | |
9657d75c | 962 | device_del(&evdev->dev); |
6addb1d6 DT |
963 | evdev_cleanup(evdev); |
964 | input_unregister_handle(handle); | |
9657d75c | 965 | put_device(&evdev->dev); |
1da177e4 LT |
966 | } |
967 | ||
66e66118 | 968 | static const struct input_device_id evdev_ids[] = { |
1da177e4 LT |
969 | { .driver_info = 1 }, /* Matches all devices */ |
970 | { }, /* Terminating zero entry */ | |
971 | }; | |
972 | ||
973 | MODULE_DEVICE_TABLE(input, evdev_ids); | |
974 | ||
975 | static struct input_handler evdev_handler = { | |
6addb1d6 DT |
976 | .event = evdev_event, |
977 | .connect = evdev_connect, | |
978 | .disconnect = evdev_disconnect, | |
979 | .fops = &evdev_fops, | |
980 | .minor = EVDEV_MINOR_BASE, | |
981 | .name = "evdev", | |
982 | .id_table = evdev_ids, | |
1da177e4 LT |
983 | }; |
984 | ||
985 | static int __init evdev_init(void) | |
986 | { | |
4263cf0f | 987 | return input_register_handler(&evdev_handler); |
1da177e4 LT |
988 | } |
989 | ||
990 | static void __exit evdev_exit(void) | |
991 | { | |
992 | input_unregister_handler(&evdev_handler); | |
993 | } | |
994 | ||
995 | module_init(evdev_init); | |
996 | module_exit(evdev_exit); | |
997 | ||
998 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
999 | MODULE_DESCRIPTION("Input driver event char devices"); | |
1000 | MODULE_LICENSE("GPL"); |