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Commit | Line | Data |
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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 { |
9fb0f14e JB |
42 | unsigned int head; |
43 | unsigned int tail; | |
cdda911c | 44 | unsigned int packet_head; /* [future] position of the first element of next packet */ |
6addb1d6 | 45 | spinlock_t buffer_lock; /* protects access to buffer, head and tail */ |
1da177e4 LT |
46 | struct fasync_struct *fasync; |
47 | struct evdev *evdev; | |
48 | struct list_head node; | |
9fb0f14e | 49 | unsigned int bufsize; |
b58f7086 | 50 | struct input_event buffer[]; |
1da177e4 LT |
51 | }; |
52 | ||
53 | static struct evdev *evdev_table[EVDEV_MINORS]; | |
6addb1d6 | 54 | static DEFINE_MUTEX(evdev_table_mutex); |
1da177e4 | 55 | |
6addb1d6 DT |
56 | static void evdev_pass_event(struct evdev_client *client, |
57 | struct input_event *event) | |
58 | { | |
9fb0f14e | 59 | /* Interrupts are disabled, just acquire the lock. */ |
6addb1d6 | 60 | spin_lock(&client->buffer_lock); |
9fb0f14e JB |
61 | |
62 | client->buffer[client->head++] = *event; | |
63 | client->head &= client->bufsize - 1; | |
64 | ||
65 | if (unlikely(client->head == client->tail)) { | |
66 | /* | |
67 | * This effectively "drops" all unconsumed events, leaving | |
68 | * EV_SYN/SYN_DROPPED plus the newest event in the queue. | |
69 | */ | |
70 | client->tail = (client->head - 2) & (client->bufsize - 1); | |
71 | ||
72 | client->buffer[client->tail].time = event->time; | |
73 | client->buffer[client->tail].type = EV_SYN; | |
74 | client->buffer[client->tail].code = SYN_DROPPED; | |
75 | client->buffer[client->tail].value = 0; | |
9fb0f14e | 76 | |
cdda911c JB |
77 | client->packet_head = client->tail; |
78 | } | |
6addb1d6 | 79 | |
cdda911c JB |
80 | if (event->type == EV_SYN && event->code == SYN_REPORT) { |
81 | client->packet_head = client->head; | |
30a589fd | 82 | kill_fasync(&client->fasync, SIGIO, POLL_IN); |
cdda911c JB |
83 | } |
84 | ||
85 | spin_unlock(&client->buffer_lock); | |
6addb1d6 DT |
86 | } |
87 | ||
88 | /* | |
82ba56c2 | 89 | * Pass incoming event to all connected clients. |
6addb1d6 DT |
90 | */ |
91 | static void evdev_event(struct input_handle *handle, | |
92 | unsigned int type, unsigned int code, int value) | |
1da177e4 LT |
93 | { |
94 | struct evdev *evdev = handle->private; | |
d0ffb9be | 95 | struct evdev_client *client; |
6addb1d6 | 96 | struct input_event event; |
1da177e4 | 97 | |
6addb1d6 DT |
98 | do_gettimeofday(&event.time); |
99 | event.type = type; | |
100 | event.code = code; | |
101 | event.value = value; | |
1da177e4 | 102 | |
82ba56c2 DT |
103 | rcu_read_lock(); |
104 | ||
6addb1d6 DT |
105 | client = rcu_dereference(evdev->grab); |
106 | if (client) | |
107 | evdev_pass_event(client, &event); | |
108 | else | |
109 | list_for_each_entry_rcu(client, &evdev->client_list, node) | |
110 | evdev_pass_event(client, &event); | |
1da177e4 | 111 | |
82ba56c2 DT |
112 | rcu_read_unlock(); |
113 | ||
1da177e4 LT |
114 | wake_up_interruptible(&evdev->wait); |
115 | } | |
116 | ||
117 | static int evdev_fasync(int fd, struct file *file, int on) | |
118 | { | |
d0ffb9be | 119 | struct evdev_client *client = file->private_data; |
1e0afb28 | 120 | |
60aa4924 | 121 | return fasync_helper(fd, file, on, &client->fasync); |
1da177e4 LT |
122 | } |
123 | ||
1e0afb28 | 124 | static int evdev_flush(struct file *file, fl_owner_t id) |
1da177e4 | 125 | { |
d0ffb9be DT |
126 | struct evdev_client *client = file->private_data; |
127 | struct evdev *evdev = client->evdev; | |
6addb1d6 DT |
128 | int retval; |
129 | ||
130 | retval = mutex_lock_interruptible(&evdev->mutex); | |
131 | if (retval) | |
132 | return retval; | |
1e0afb28 | 133 | |
d0ffb9be | 134 | if (!evdev->exist) |
6addb1d6 DT |
135 | retval = -ENODEV; |
136 | else | |
137 | retval = input_flush_device(&evdev->handle, file); | |
1e0afb28 | 138 | |
6addb1d6 DT |
139 | mutex_unlock(&evdev->mutex); |
140 | return retval; | |
1da177e4 LT |
141 | } |
142 | ||
9657d75c | 143 | static void evdev_free(struct device *dev) |
1da177e4 | 144 | { |
9657d75c DT |
145 | struct evdev *evdev = container_of(dev, struct evdev, dev); |
146 | ||
a7097ff8 | 147 | input_put_device(evdev->handle.dev); |
1da177e4 LT |
148 | kfree(evdev); |
149 | } | |
150 | ||
6addb1d6 DT |
151 | /* |
152 | * Grabs an event device (along with underlying input device). | |
153 | * This function is called with evdev->mutex taken. | |
154 | */ | |
155 | static int evdev_grab(struct evdev *evdev, struct evdev_client *client) | |
156 | { | |
157 | int error; | |
158 | ||
159 | if (evdev->grab) | |
160 | return -EBUSY; | |
161 | ||
162 | error = input_grab_device(&evdev->handle); | |
163 | if (error) | |
164 | return error; | |
165 | ||
166 | rcu_assign_pointer(evdev->grab, client); | |
6addb1d6 DT |
167 | |
168 | return 0; | |
169 | } | |
170 | ||
171 | static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client) | |
172 | { | |
173 | if (evdev->grab != client) | |
174 | return -EINVAL; | |
175 | ||
176 | rcu_assign_pointer(evdev->grab, NULL); | |
82ba56c2 | 177 | synchronize_rcu(); |
6addb1d6 DT |
178 | input_release_device(&evdev->handle); |
179 | ||
180 | return 0; | |
181 | } | |
182 | ||
183 | static void evdev_attach_client(struct evdev *evdev, | |
184 | struct evdev_client *client) | |
185 | { | |
186 | spin_lock(&evdev->client_lock); | |
187 | list_add_tail_rcu(&client->node, &evdev->client_list); | |
188 | spin_unlock(&evdev->client_lock); | |
6addb1d6 DT |
189 | } |
190 | ||
191 | static void evdev_detach_client(struct evdev *evdev, | |
192 | struct evdev_client *client) | |
193 | { | |
194 | spin_lock(&evdev->client_lock); | |
195 | list_del_rcu(&client->node); | |
196 | spin_unlock(&evdev->client_lock); | |
82ba56c2 | 197 | synchronize_rcu(); |
6addb1d6 DT |
198 | } |
199 | ||
200 | static int evdev_open_device(struct evdev *evdev) | |
201 | { | |
202 | int retval; | |
203 | ||
204 | retval = mutex_lock_interruptible(&evdev->mutex); | |
205 | if (retval) | |
206 | return retval; | |
207 | ||
208 | if (!evdev->exist) | |
209 | retval = -ENODEV; | |
06445014 | 210 | else if (!evdev->open++) { |
6addb1d6 | 211 | retval = input_open_device(&evdev->handle); |
06445014 ON |
212 | if (retval) |
213 | evdev->open--; | |
214 | } | |
6addb1d6 DT |
215 | |
216 | mutex_unlock(&evdev->mutex); | |
217 | return retval; | |
218 | } | |
219 | ||
220 | static void evdev_close_device(struct evdev *evdev) | |
221 | { | |
222 | mutex_lock(&evdev->mutex); | |
223 | ||
224 | if (evdev->exist && !--evdev->open) | |
225 | input_close_device(&evdev->handle); | |
226 | ||
227 | mutex_unlock(&evdev->mutex); | |
228 | } | |
229 | ||
230 | /* | |
231 | * Wake up users waiting for IO so they can disconnect from | |
232 | * dead device. | |
233 | */ | |
234 | static void evdev_hangup(struct evdev *evdev) | |
235 | { | |
236 | struct evdev_client *client; | |
237 | ||
238 | spin_lock(&evdev->client_lock); | |
239 | list_for_each_entry(client, &evdev->client_list, node) | |
240 | kill_fasync(&client->fasync, SIGIO, POLL_HUP); | |
241 | spin_unlock(&evdev->client_lock); | |
242 | ||
243 | wake_up_interruptible(&evdev->wait); | |
244 | } | |
245 | ||
d0ffb9be | 246 | static int evdev_release(struct inode *inode, struct file *file) |
1da177e4 | 247 | { |
d0ffb9be DT |
248 | struct evdev_client *client = file->private_data; |
249 | struct evdev *evdev = client->evdev; | |
1da177e4 | 250 | |
6addb1d6 DT |
251 | mutex_lock(&evdev->mutex); |
252 | if (evdev->grab == client) | |
253 | evdev_ungrab(evdev, client); | |
254 | mutex_unlock(&evdev->mutex); | |
1da177e4 | 255 | |
6addb1d6 | 256 | evdev_detach_client(evdev, client); |
d0ffb9be | 257 | kfree(client); |
1da177e4 | 258 | |
6addb1d6 | 259 | evdev_close_device(evdev); |
9657d75c | 260 | put_device(&evdev->dev); |
1da177e4 | 261 | |
1da177e4 LT |
262 | return 0; |
263 | } | |
264 | ||
b58f7086 HR |
265 | static unsigned int evdev_compute_buffer_size(struct input_dev *dev) |
266 | { | |
63a6404d HR |
267 | unsigned int n_events = |
268 | max(dev->hint_events_per_packet * EVDEV_BUF_PACKETS, | |
269 | EVDEV_MIN_BUFFER_SIZE); | |
270 | ||
271 | return roundup_pow_of_two(n_events); | |
b58f7086 HR |
272 | } |
273 | ||
d0ffb9be | 274 | static int evdev_open(struct inode *inode, struct file *file) |
1da177e4 | 275 | { |
d0ffb9be | 276 | struct evdev *evdev; |
6addb1d6 | 277 | struct evdev_client *client; |
1da177e4 | 278 | int i = iminor(inode) - EVDEV_MINOR_BASE; |
b58f7086 | 279 | unsigned int bufsize; |
d542ed82 | 280 | int error; |
1da177e4 | 281 | |
d0ffb9be | 282 | if (i >= EVDEV_MINORS) |
1da177e4 LT |
283 | return -ENODEV; |
284 | ||
6addb1d6 DT |
285 | error = mutex_lock_interruptible(&evdev_table_mutex); |
286 | if (error) | |
287 | return error; | |
d0ffb9be | 288 | evdev = evdev_table[i]; |
6addb1d6 DT |
289 | if (evdev) |
290 | get_device(&evdev->dev); | |
291 | mutex_unlock(&evdev_table_mutex); | |
d0ffb9be | 292 | |
6addb1d6 | 293 | if (!evdev) |
1da177e4 LT |
294 | return -ENODEV; |
295 | ||
b58f7086 HR |
296 | bufsize = evdev_compute_buffer_size(evdev->handle.dev); |
297 | ||
298 | client = kzalloc(sizeof(struct evdev_client) + | |
299 | bufsize * sizeof(struct input_event), | |
300 | GFP_KERNEL); | |
9657d75c DT |
301 | if (!client) { |
302 | error = -ENOMEM; | |
303 | goto err_put_evdev; | |
304 | } | |
1da177e4 | 305 | |
b58f7086 | 306 | client->bufsize = bufsize; |
6addb1d6 | 307 | spin_lock_init(&client->buffer_lock); |
d0ffb9be | 308 | client->evdev = evdev; |
6addb1d6 | 309 | evdev_attach_client(evdev, client); |
1da177e4 | 310 | |
6addb1d6 DT |
311 | error = evdev_open_device(evdev); |
312 | if (error) | |
313 | goto err_free_client; | |
1da177e4 | 314 | |
d0ffb9be | 315 | file->private_data = client; |
3d7bbd45 DT |
316 | nonseekable_open(inode, file); |
317 | ||
1da177e4 | 318 | return 0; |
9657d75c DT |
319 | |
320 | err_free_client: | |
6addb1d6 | 321 | evdev_detach_client(evdev, client); |
9657d75c DT |
322 | kfree(client); |
323 | err_put_evdev: | |
324 | put_device(&evdev->dev); | |
325 | return error; | |
1da177e4 LT |
326 | } |
327 | ||
6addb1d6 DT |
328 | static ssize_t evdev_write(struct file *file, const char __user *buffer, |
329 | size_t count, loff_t *ppos) | |
3a51f7c4 | 330 | { |
d0ffb9be DT |
331 | struct evdev_client *client = file->private_data; |
332 | struct evdev *evdev = client->evdev; | |
3a51f7c4 | 333 | struct input_event event; |
6addb1d6 | 334 | int retval; |
52658bb6 | 335 | |
439581ec PK |
336 | if (count < input_event_size()) |
337 | return -EINVAL; | |
338 | ||
6addb1d6 DT |
339 | retval = mutex_lock_interruptible(&evdev->mutex); |
340 | if (retval) | |
341 | return retval; | |
342 | ||
343 | if (!evdev->exist) { | |
344 | retval = -ENODEV; | |
345 | goto out; | |
346 | } | |
52658bb6 | 347 | |
439581ec | 348 | do { |
2d56f3a3 | 349 | if (input_event_from_user(buffer + retval, &event)) { |
6addb1d6 DT |
350 | retval = -EFAULT; |
351 | goto out; | |
352 | } | |
439581ec | 353 | retval += input_event_size(); |
6addb1d6 DT |
354 | |
355 | input_inject_event(&evdev->handle, | |
356 | event.type, event.code, event.value); | |
439581ec | 357 | } while (retval + input_event_size() <= count); |
52658bb6 | 358 | |
6addb1d6 DT |
359 | out: |
360 | mutex_unlock(&evdev->mutex); | |
52658bb6 JK |
361 | return retval; |
362 | } | |
52658bb6 | 363 | |
6addb1d6 DT |
364 | static int evdev_fetch_next_event(struct evdev_client *client, |
365 | struct input_event *event) | |
366 | { | |
367 | int have_event; | |
368 | ||
369 | spin_lock_irq(&client->buffer_lock); | |
370 | ||
371 | have_event = client->head != client->tail; | |
372 | if (have_event) { | |
373 | *event = client->buffer[client->tail++]; | |
b58f7086 | 374 | client->tail &= client->bufsize - 1; |
6addb1d6 DT |
375 | } |
376 | ||
377 | spin_unlock_irq(&client->buffer_lock); | |
378 | ||
379 | return have_event; | |
380 | } | |
381 | ||
382 | static ssize_t evdev_read(struct file *file, char __user *buffer, | |
383 | size_t count, loff_t *ppos) | |
1da177e4 | 384 | { |
d0ffb9be DT |
385 | struct evdev_client *client = file->private_data; |
386 | struct evdev *evdev = client->evdev; | |
6addb1d6 | 387 | struct input_event event; |
1da177e4 LT |
388 | int retval; |
389 | ||
2d56f3a3 | 390 | if (count < input_event_size()) |
1da177e4 LT |
391 | return -EINVAL; |
392 | ||
cdda911c | 393 | if (client->packet_head == client->tail && evdev->exist && |
6addb1d6 | 394 | (file->f_flags & O_NONBLOCK)) |
1da177e4 LT |
395 | return -EAGAIN; |
396 | ||
d0ffb9be | 397 | retval = wait_event_interruptible(evdev->wait, |
cdda911c | 398 | client->packet_head != client->tail || !evdev->exist); |
1da177e4 LT |
399 | if (retval) |
400 | return retval; | |
401 | ||
d0ffb9be | 402 | if (!evdev->exist) |
1da177e4 LT |
403 | return -ENODEV; |
404 | ||
2d56f3a3 | 405 | while (retval + input_event_size() <= count && |
6addb1d6 | 406 | evdev_fetch_next_event(client, &event)) { |
3a51f7c4 | 407 | |
2d56f3a3 | 408 | if (input_event_to_user(buffer + retval, &event)) |
3a51f7c4 DT |
409 | return -EFAULT; |
410 | ||
2d56f3a3 | 411 | retval += input_event_size(); |
1da177e4 LT |
412 | } |
413 | ||
414 | return retval; | |
415 | } | |
416 | ||
417 | /* No kernel lock - fine */ | |
418 | static unsigned int evdev_poll(struct file *file, poll_table *wait) | |
419 | { | |
d0ffb9be DT |
420 | struct evdev_client *client = file->private_data; |
421 | struct evdev *evdev = client->evdev; | |
c18fb139 | 422 | unsigned int mask; |
1e0afb28 | 423 | |
d0ffb9be | 424 | poll_wait(file, &evdev->wait, wait); |
c18fb139 DT |
425 | |
426 | mask = evdev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR; | |
cdda911c | 427 | if (client->packet_head != client->tail) |
c18fb139 DT |
428 | mask |= POLLIN | POLLRDNORM; |
429 | ||
430 | return mask; | |
1da177e4 LT |
431 | } |
432 | ||
3a51f7c4 DT |
433 | #ifdef CONFIG_COMPAT |
434 | ||
435 | #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) | |
7b19ada2 | 436 | #define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1) |
3a51f7c4 DT |
437 | |
438 | #ifdef __BIG_ENDIAN | |
439 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
440 | unsigned int maxlen, void __user *p, int compat) | |
441 | { | |
442 | int len, i; | |
443 | ||
444 | if (compat) { | |
7b19ada2 | 445 | len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t); |
bf61f8d3 | 446 | if (len > maxlen) |
3a51f7c4 DT |
447 | len = maxlen; |
448 | ||
449 | for (i = 0; i < len / sizeof(compat_long_t); i++) | |
450 | if (copy_to_user((compat_long_t __user *) p + i, | |
451 | (compat_long_t *) bits + | |
452 | i + 1 - ((i % 2) << 1), | |
453 | sizeof(compat_long_t))) | |
454 | return -EFAULT; | |
455 | } else { | |
7b19ada2 | 456 | len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
457 | if (len > maxlen) |
458 | len = maxlen; | |
459 | ||
460 | if (copy_to_user(p, bits, len)) | |
461 | return -EFAULT; | |
462 | } | |
463 | ||
464 | return len; | |
465 | } | |
466 | #else | |
467 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
468 | unsigned int maxlen, void __user *p, int compat) | |
469 | { | |
470 | int len = compat ? | |
7b19ada2 JS |
471 | BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) : |
472 | 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 | #endif /* __BIG_ENDIAN */ | |
480 | ||
481 | #else | |
482 | ||
483 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
484 | unsigned int maxlen, void __user *p, int compat) | |
485 | { | |
7b19ada2 | 486 | int len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
487 | |
488 | if (len > maxlen) | |
489 | len = maxlen; | |
490 | ||
491 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
492 | } | |
493 | ||
494 | #endif /* CONFIG_COMPAT */ | |
495 | ||
496 | static int str_to_user(const char *str, unsigned int maxlen, void __user *p) | |
497 | { | |
498 | int len; | |
499 | ||
500 | if (!str) | |
501 | return -ENOENT; | |
502 | ||
503 | len = strlen(str) + 1; | |
504 | if (len > maxlen) | |
505 | len = maxlen; | |
506 | ||
507 | return copy_to_user(p, str, len) ? -EFAULT : len; | |
508 | } | |
509 | ||
f2afa771 | 510 | #define OLD_KEY_MAX 0x1ff |
448cd166 DT |
511 | static int handle_eviocgbit(struct input_dev *dev, |
512 | unsigned int type, unsigned int size, | |
513 | void __user *p, int compat_mode) | |
5402a734 | 514 | { |
f2afa771 | 515 | static unsigned long keymax_warn_time; |
5402a734 LT |
516 | unsigned long *bits; |
517 | int len; | |
518 | ||
448cd166 | 519 | switch (type) { |
5402a734 LT |
520 | |
521 | case 0: bits = dev->evbit; len = EV_MAX; break; | |
522 | case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; | |
523 | case EV_REL: bits = dev->relbit; len = REL_MAX; break; | |
524 | case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; | |
525 | case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; | |
526 | case EV_LED: bits = dev->ledbit; len = LED_MAX; break; | |
527 | case EV_SND: bits = dev->sndbit; len = SND_MAX; break; | |
528 | case EV_FF: bits = dev->ffbit; len = FF_MAX; break; | |
529 | case EV_SW: bits = dev->swbit; len = SW_MAX; break; | |
530 | default: return -EINVAL; | |
531 | } | |
f2afa771 DT |
532 | |
533 | /* | |
534 | * Work around bugs in userspace programs that like to do | |
535 | * EVIOCGBIT(EV_KEY, KEY_MAX) and not realize that 'len' | |
536 | * should be in bytes, not in bits. | |
537 | */ | |
448cd166 | 538 | if (type == EV_KEY && size == OLD_KEY_MAX) { |
f2afa771 DT |
539 | len = OLD_KEY_MAX; |
540 | if (printk_timed_ratelimit(&keymax_warn_time, 10 * 1000)) | |
da0c4901 JP |
541 | pr_warning("(EVIOCGBIT): Suspicious buffer size %u, " |
542 | "limiting output to %zu bytes. See " | |
543 | "http://userweb.kernel.org/~dtor/eviocgbit-bug.html\n", | |
544 | OLD_KEY_MAX, | |
545 | BITS_TO_LONGS(OLD_KEY_MAX) * sizeof(long)); | |
f2afa771 DT |
546 | } |
547 | ||
448cd166 | 548 | return bits_to_user(bits, len, size, p, compat_mode); |
5402a734 | 549 | } |
f2afa771 | 550 | #undef OLD_KEY_MAX |
5402a734 | 551 | |
ab4e0192 | 552 | static int evdev_handle_get_keycode(struct input_dev *dev, void __user *p) |
8613e4c2 | 553 | { |
ab4e0192 DT |
554 | struct input_keymap_entry ke = { |
555 | .len = sizeof(unsigned int), | |
556 | .flags = 0, | |
557 | }; | |
558 | int __user *ip = (int __user *)p; | |
8613e4c2 MCC |
559 | int error; |
560 | ||
ab4e0192 DT |
561 | /* legacy case */ |
562 | if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) | |
563 | return -EFAULT; | |
8613e4c2 | 564 | |
ab4e0192 DT |
565 | error = input_get_keycode(dev, &ke); |
566 | if (error) | |
567 | return error; | |
8613e4c2 | 568 | |
ab4e0192 DT |
569 | if (put_user(ke.keycode, ip + 1)) |
570 | return -EFAULT; | |
8613e4c2 | 571 | |
ab4e0192 DT |
572 | return 0; |
573 | } | |
8613e4c2 | 574 | |
ab4e0192 DT |
575 | static int evdev_handle_get_keycode_v2(struct input_dev *dev, void __user *p) |
576 | { | |
577 | struct input_keymap_entry ke; | |
578 | int error; | |
8613e4c2 | 579 | |
ab4e0192 DT |
580 | if (copy_from_user(&ke, p, sizeof(ke))) |
581 | return -EFAULT; | |
8613e4c2 | 582 | |
ab4e0192 DT |
583 | error = input_get_keycode(dev, &ke); |
584 | if (error) | |
585 | return error; | |
8613e4c2 | 586 | |
ab4e0192 DT |
587 | if (copy_to_user(p, &ke, sizeof(ke))) |
588 | return -EFAULT; | |
8613e4c2 | 589 | |
8613e4c2 MCC |
590 | return 0; |
591 | } | |
592 | ||
ab4e0192 | 593 | static int evdev_handle_set_keycode(struct input_dev *dev, void __user *p) |
8613e4c2 | 594 | { |
ab4e0192 DT |
595 | struct input_keymap_entry ke = { |
596 | .len = sizeof(unsigned int), | |
597 | .flags = 0, | |
598 | }; | |
599 | int __user *ip = (int __user *)p; | |
8613e4c2 | 600 | |
ab4e0192 DT |
601 | if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) |
602 | return -EFAULT; | |
8613e4c2 | 603 | |
ab4e0192 DT |
604 | if (get_user(ke.keycode, ip + 1)) |
605 | return -EFAULT; | |
8613e4c2 | 606 | |
ab4e0192 DT |
607 | return input_set_keycode(dev, &ke); |
608 | } | |
8613e4c2 | 609 | |
ab4e0192 DT |
610 | static int evdev_handle_set_keycode_v2(struct input_dev *dev, void __user *p) |
611 | { | |
612 | struct input_keymap_entry ke; | |
8613e4c2 | 613 | |
ab4e0192 DT |
614 | if (copy_from_user(&ke, p, sizeof(ke))) |
615 | return -EFAULT; | |
8613e4c2 | 616 | |
ab4e0192 DT |
617 | if (ke.len > sizeof(ke.scancode)) |
618 | return -EINVAL; | |
8613e4c2 MCC |
619 | |
620 | return input_set_keycode(dev, &ke); | |
621 | } | |
622 | ||
6addb1d6 DT |
623 | static long evdev_do_ioctl(struct file *file, unsigned int cmd, |
624 | void __user *p, int compat_mode) | |
1da177e4 | 625 | { |
d0ffb9be DT |
626 | struct evdev_client *client = file->private_data; |
627 | struct evdev *evdev = client->evdev; | |
1da177e4 LT |
628 | struct input_dev *dev = evdev->handle.dev; |
629 | struct input_absinfo abs; | |
509ca1a9 | 630 | struct ff_effect effect; |
3a51f7c4 | 631 | int __user *ip = (int __user *)p; |
58b93995 | 632 | unsigned int i, t, u, v; |
448cd166 | 633 | unsigned int size; |
509ca1a9 | 634 | int error; |
1da177e4 | 635 | |
448cd166 | 636 | /* First we check for fixed-length commands */ |
1da177e4 LT |
637 | switch (cmd) { |
638 | ||
6addb1d6 DT |
639 | case EVIOCGVERSION: |
640 | return put_user(EV_VERSION, ip); | |
1da177e4 | 641 | |
6addb1d6 DT |
642 | case EVIOCGID: |
643 | if (copy_to_user(p, &dev->id, sizeof(struct input_id))) | |
644 | return -EFAULT; | |
645 | return 0; | |
08791e5c | 646 | |
6addb1d6 DT |
647 | case EVIOCGREP: |
648 | if (!test_bit(EV_REP, dev->evbit)) | |
649 | return -ENOSYS; | |
650 | if (put_user(dev->rep[REP_DELAY], ip)) | |
651 | return -EFAULT; | |
652 | if (put_user(dev->rep[REP_PERIOD], ip + 1)) | |
653 | return -EFAULT; | |
654 | return 0; | |
08791e5c | 655 | |
6addb1d6 DT |
656 | case EVIOCSREP: |
657 | if (!test_bit(EV_REP, dev->evbit)) | |
658 | return -ENOSYS; | |
659 | if (get_user(u, ip)) | |
660 | return -EFAULT; | |
661 | if (get_user(v, ip + 1)) | |
662 | return -EFAULT; | |
08791e5c | 663 | |
6addb1d6 DT |
664 | input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u); |
665 | input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v); | |
3a51f7c4 | 666 | |
6addb1d6 | 667 | return 0; |
1da177e4 | 668 | |
6addb1d6 DT |
669 | case EVIOCRMFF: |
670 | return input_ff_erase(dev, (int)(unsigned long) p, file); | |
1da177e4 | 671 | |
6addb1d6 DT |
672 | case EVIOCGEFFECTS: |
673 | i = test_bit(EV_FF, dev->evbit) ? | |
674 | dev->ff->max_effects : 0; | |
675 | if (put_user(i, ip)) | |
676 | return -EFAULT; | |
677 | return 0; | |
678 | ||
679 | case EVIOCGRAB: | |
680 | if (p) | |
681 | return evdev_grab(evdev, client); | |
682 | else | |
683 | return evdev_ungrab(evdev, client); | |
ab4e0192 DT |
684 | |
685 | case EVIOCGKEYCODE: | |
686 | return evdev_handle_get_keycode(dev, p); | |
687 | ||
688 | case EVIOCSKEYCODE: | |
689 | return evdev_handle_set_keycode(dev, p); | |
690 | ||
691 | case EVIOCGKEYCODE_V2: | |
692 | return evdev_handle_get_keycode_v2(dev, p); | |
693 | ||
694 | case EVIOCSKEYCODE_V2: | |
695 | return evdev_handle_set_keycode_v2(dev, p); | |
448cd166 | 696 | } |
1da177e4 | 697 | |
448cd166 | 698 | size = _IOC_SIZE(cmd); |
1da177e4 | 699 | |
448cd166 DT |
700 | /* Now check variable-length commands */ |
701 | #define EVIOC_MASK_SIZE(nr) ((nr) & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) | |
448cd166 | 702 | switch (EVIOC_MASK_SIZE(cmd)) { |
41e979f8 | 703 | |
85b77200 HR |
704 | case EVIOCGPROP(0): |
705 | return bits_to_user(dev->propbit, INPUT_PROP_MAX, | |
706 | size, p, compat_mode); | |
707 | ||
448cd166 DT |
708 | case EVIOCGKEY(0): |
709 | return bits_to_user(dev->key, KEY_MAX, size, p, compat_mode); | |
1da177e4 | 710 | |
448cd166 DT |
711 | case EVIOCGLED(0): |
712 | return bits_to_user(dev->led, LED_MAX, size, p, compat_mode); | |
1da177e4 | 713 | |
448cd166 DT |
714 | case EVIOCGSND(0): |
715 | return bits_to_user(dev->snd, SND_MAX, size, p, compat_mode); | |
1da177e4 | 716 | |
448cd166 DT |
717 | case EVIOCGSW(0): |
718 | return bits_to_user(dev->sw, SW_MAX, size, p, compat_mode); | |
31581066 | 719 | |
448cd166 DT |
720 | case EVIOCGNAME(0): |
721 | return str_to_user(dev->name, size, p); | |
1da177e4 | 722 | |
448cd166 DT |
723 | case EVIOCGPHYS(0): |
724 | return str_to_user(dev->phys, size, p); | |
1da177e4 | 725 | |
448cd166 DT |
726 | case EVIOCGUNIQ(0): |
727 | return str_to_user(dev->uniq, size, p); | |
1da177e4 | 728 | |
448cd166 DT |
729 | case EVIOC_MASK_SIZE(EVIOCSFF): |
730 | if (input_ff_effect_from_user(p, size, &effect)) | |
731 | return -EFAULT; | |
1da177e4 | 732 | |
448cd166 | 733 | error = input_ff_upload(dev, &effect, file); |
1da177e4 | 734 | |
448cd166 DT |
735 | if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) |
736 | return -EFAULT; | |
41e979f8 | 737 | |
448cd166 DT |
738 | return error; |
739 | } | |
1da177e4 | 740 | |
448cd166 DT |
741 | /* Multi-number variable-length handlers */ |
742 | if (_IOC_TYPE(cmd) != 'E') | |
743 | return -EINVAL; | |
1da177e4 | 744 | |
448cd166 | 745 | if (_IOC_DIR(cmd) == _IOC_READ) { |
6addb1d6 | 746 | |
448cd166 DT |
747 | if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0))) |
748 | return handle_eviocgbit(dev, | |
749 | _IOC_NR(cmd) & EV_MAX, size, | |
750 | p, compat_mode); | |
1da177e4 | 751 | |
448cd166 | 752 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { |
f2278f31 | 753 | |
0a74a1df DM |
754 | if (!dev->absinfo) |
755 | return -EINVAL; | |
756 | ||
448cd166 DT |
757 | t = _IOC_NR(cmd) & ABS_MAX; |
758 | abs = dev->absinfo[t]; | |
f2278f31 | 759 | |
448cd166 DT |
760 | if (copy_to_user(p, &abs, min_t(size_t, |
761 | size, sizeof(struct input_absinfo)))) | |
762 | return -EFAULT; | |
f2278f31 | 763 | |
448cd166 DT |
764 | return 0; |
765 | } | |
766 | } | |
f2278f31 | 767 | |
f9ce6eb5 | 768 | if (_IOC_DIR(cmd) == _IOC_WRITE) { |
f2278f31 | 769 | |
448cd166 | 770 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { |
1da177e4 | 771 | |
0a74a1df DM |
772 | if (!dev->absinfo) |
773 | return -EINVAL; | |
774 | ||
448cd166 | 775 | t = _IOC_NR(cmd) & ABS_MAX; |
41e979f8 | 776 | |
448cd166 DT |
777 | if (copy_from_user(&abs, p, min_t(size_t, |
778 | size, sizeof(struct input_absinfo)))) | |
779 | return -EFAULT; | |
1da177e4 | 780 | |
448cd166 DT |
781 | if (size < sizeof(struct input_absinfo)) |
782 | abs.resolution = 0; | |
d31b2865 | 783 | |
448cd166 DT |
784 | /* We can't change number of reserved MT slots */ |
785 | if (t == ABS_MT_SLOT) | |
786 | return -EINVAL; | |
40d007e7 | 787 | |
448cd166 DT |
788 | /* |
789 | * Take event lock to ensure that we are not | |
790 | * changing device parameters in the middle | |
791 | * of event. | |
792 | */ | |
793 | spin_lock_irq(&dev->event_lock); | |
794 | dev->absinfo[t] = abs; | |
795 | spin_unlock_irq(&dev->event_lock); | |
6addb1d6 | 796 | |
448cd166 | 797 | return 0; |
6addb1d6 | 798 | } |
1da177e4 | 799 | } |
448cd166 | 800 | |
1da177e4 LT |
801 | return -EINVAL; |
802 | } | |
1da177e4 | 803 | |
6addb1d6 DT |
804 | static long evdev_ioctl_handler(struct file *file, unsigned int cmd, |
805 | void __user *p, int compat_mode) | |
806 | { | |
807 | struct evdev_client *client = file->private_data; | |
808 | struct evdev *evdev = client->evdev; | |
809 | int retval; | |
810 | ||
811 | retval = mutex_lock_interruptible(&evdev->mutex); | |
812 | if (retval) | |
813 | return retval; | |
814 | ||
815 | if (!evdev->exist) { | |
816 | retval = -ENODEV; | |
817 | goto out; | |
818 | } | |
819 | ||
820 | retval = evdev_do_ioctl(file, cmd, p, compat_mode); | |
821 | ||
822 | out: | |
823 | mutex_unlock(&evdev->mutex); | |
824 | return retval; | |
825 | } | |
826 | ||
3a51f7c4 DT |
827 | static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
828 | { | |
829 | return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0); | |
830 | } | |
41e979f8 | 831 | |
3a51f7c4 | 832 | #ifdef CONFIG_COMPAT |
6addb1d6 DT |
833 | static long evdev_ioctl_compat(struct file *file, |
834 | unsigned int cmd, unsigned long arg) | |
52658bb6 | 835 | { |
3a51f7c4 | 836 | return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1); |
1da177e4 | 837 | } |
52658bb6 | 838 | #endif |
1da177e4 | 839 | |
66e66118 | 840 | static const struct file_operations evdev_fops = { |
6addb1d6 DT |
841 | .owner = THIS_MODULE, |
842 | .read = evdev_read, | |
843 | .write = evdev_write, | |
844 | .poll = evdev_poll, | |
845 | .open = evdev_open, | |
846 | .release = evdev_release, | |
847 | .unlocked_ioctl = evdev_ioctl, | |
52658bb6 | 848 | #ifdef CONFIG_COMPAT |
6addb1d6 | 849 | .compat_ioctl = evdev_ioctl_compat, |
52658bb6 | 850 | #endif |
6addb1d6 | 851 | .fasync = evdev_fasync, |
6038f373 AB |
852 | .flush = evdev_flush, |
853 | .llseek = no_llseek, | |
1da177e4 LT |
854 | }; |
855 | ||
6addb1d6 DT |
856 | static int evdev_install_chrdev(struct evdev *evdev) |
857 | { | |
858 | /* | |
859 | * No need to do any locking here as calls to connect and | |
860 | * disconnect are serialized by the input core | |
861 | */ | |
862 | evdev_table[evdev->minor] = evdev; | |
863 | return 0; | |
864 | } | |
865 | ||
866 | static void evdev_remove_chrdev(struct evdev *evdev) | |
867 | { | |
868 | /* | |
869 | * Lock evdev table to prevent race with evdev_open() | |
870 | */ | |
871 | mutex_lock(&evdev_table_mutex); | |
872 | evdev_table[evdev->minor] = NULL; | |
873 | mutex_unlock(&evdev_table_mutex); | |
874 | } | |
875 | ||
876 | /* | |
877 | * Mark device non-existent. This disables writes, ioctls and | |
878 | * prevents new users from opening the device. Already posted | |
879 | * blocking reads will stay, however new ones will fail. | |
880 | */ | |
881 | static void evdev_mark_dead(struct evdev *evdev) | |
882 | { | |
883 | mutex_lock(&evdev->mutex); | |
20da92de | 884 | evdev->exist = false; |
6addb1d6 DT |
885 | mutex_unlock(&evdev->mutex); |
886 | } | |
887 | ||
888 | static void evdev_cleanup(struct evdev *evdev) | |
889 | { | |
890 | struct input_handle *handle = &evdev->handle; | |
891 | ||
892 | evdev_mark_dead(evdev); | |
893 | evdev_hangup(evdev); | |
894 | evdev_remove_chrdev(evdev); | |
895 | ||
896 | /* evdev is marked dead so no one else accesses evdev->open */ | |
897 | if (evdev->open) { | |
898 | input_flush_device(handle, NULL); | |
899 | input_close_device(handle); | |
900 | } | |
901 | } | |
902 | ||
903 | /* | |
904 | * Create new evdev device. Note that input core serializes calls | |
905 | * to connect and disconnect so we don't need to lock evdev_table here. | |
906 | */ | |
5b2a0826 DT |
907 | static int evdev_connect(struct input_handler *handler, struct input_dev *dev, |
908 | const struct input_device_id *id) | |
1da177e4 LT |
909 | { |
910 | struct evdev *evdev; | |
911 | int minor; | |
5b2a0826 | 912 | int error; |
1da177e4 | 913 | |
6addb1d6 DT |
914 | for (minor = 0; minor < EVDEV_MINORS; minor++) |
915 | if (!evdev_table[minor]) | |
916 | break; | |
917 | ||
1da177e4 | 918 | if (minor == EVDEV_MINORS) { |
da0c4901 | 919 | pr_err("no more free evdev devices\n"); |
5b2a0826 | 920 | return -ENFILE; |
1da177e4 LT |
921 | } |
922 | ||
5b2a0826 DT |
923 | evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL); |
924 | if (!evdev) | |
925 | return -ENOMEM; | |
1da177e4 | 926 | |
d0ffb9be | 927 | INIT_LIST_HEAD(&evdev->client_list); |
6addb1d6 DT |
928 | spin_lock_init(&evdev->client_lock); |
929 | mutex_init(&evdev->mutex); | |
1da177e4 LT |
930 | init_waitqueue_head(&evdev->wait); |
931 | ||
3d5cb60e | 932 | dev_set_name(&evdev->dev, "event%d", minor); |
20da92de | 933 | evdev->exist = true; |
1da177e4 | 934 | evdev->minor = minor; |
6addb1d6 | 935 | |
a7097ff8 | 936 | evdev->handle.dev = input_get_device(dev); |
3d5cb60e | 937 | evdev->handle.name = dev_name(&evdev->dev); |
1da177e4 LT |
938 | evdev->handle.handler = handler; |
939 | evdev->handle.private = evdev; | |
1da177e4 | 940 | |
6addb1d6 | 941 | evdev->dev.devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor); |
9657d75c DT |
942 | evdev->dev.class = &input_class; |
943 | evdev->dev.parent = &dev->dev; | |
9657d75c DT |
944 | evdev->dev.release = evdev_free; |
945 | device_initialize(&evdev->dev); | |
5b2a0826 | 946 | |
6addb1d6 | 947 | error = input_register_handle(&evdev->handle); |
5b2a0826 | 948 | if (error) |
9657d75c | 949 | goto err_free_evdev; |
5b2a0826 | 950 | |
6addb1d6 DT |
951 | error = evdev_install_chrdev(evdev); |
952 | if (error) | |
953 | goto err_unregister_handle; | |
954 | ||
955 | error = device_add(&evdev->dev); | |
5b2a0826 | 956 | if (error) |
6addb1d6 | 957 | goto err_cleanup_evdev; |
1da177e4 | 958 | |
5b2a0826 | 959 | return 0; |
1da177e4 | 960 | |
6addb1d6 DT |
961 | err_cleanup_evdev: |
962 | evdev_cleanup(evdev); | |
963 | err_unregister_handle: | |
964 | input_unregister_handle(&evdev->handle); | |
5b2a0826 | 965 | err_free_evdev: |
9657d75c | 966 | put_device(&evdev->dev); |
5b2a0826 | 967 | return error; |
1da177e4 LT |
968 | } |
969 | ||
970 | static void evdev_disconnect(struct input_handle *handle) | |
971 | { | |
972 | struct evdev *evdev = handle->private; | |
1da177e4 | 973 | |
9657d75c | 974 | device_del(&evdev->dev); |
6addb1d6 DT |
975 | evdev_cleanup(evdev); |
976 | input_unregister_handle(handle); | |
9657d75c | 977 | put_device(&evdev->dev); |
1da177e4 LT |
978 | } |
979 | ||
66e66118 | 980 | static const struct input_device_id evdev_ids[] = { |
1da177e4 LT |
981 | { .driver_info = 1 }, /* Matches all devices */ |
982 | { }, /* Terminating zero entry */ | |
983 | }; | |
984 | ||
985 | MODULE_DEVICE_TABLE(input, evdev_ids); | |
986 | ||
987 | static struct input_handler evdev_handler = { | |
6addb1d6 DT |
988 | .event = evdev_event, |
989 | .connect = evdev_connect, | |
990 | .disconnect = evdev_disconnect, | |
991 | .fops = &evdev_fops, | |
992 | .minor = EVDEV_MINOR_BASE, | |
993 | .name = "evdev", | |
994 | .id_table = evdev_ids, | |
1da177e4 LT |
995 | }; |
996 | ||
997 | static int __init evdev_init(void) | |
998 | { | |
4263cf0f | 999 | return input_register_handler(&evdev_handler); |
1da177e4 LT |
1000 | } |
1001 | ||
1002 | static void __exit evdev_exit(void) | |
1003 | { | |
1004 | input_unregister_handler(&evdev_handler); | |
1005 | } | |
1006 | ||
1007 | module_init(evdev_init); | |
1008 | module_exit(evdev_exit); | |
1009 | ||
1010 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
1011 | MODULE_DESCRIPTION("Input driver event char devices"); | |
1012 | MODULE_LICENSE("GPL"); |