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 | ||
11 | #define EVDEV_MINOR_BASE 64 | |
12 | #define EVDEV_MINORS 32 | |
63a6404d HR |
13 | #define EVDEV_MIN_BUFFER_SIZE 64U |
14 | #define EVDEV_BUF_PACKETS 8 | |
1da177e4 LT |
15 | |
16 | #include <linux/poll.h> | |
a99bbaf5 | 17 | #include <linux/sched.h> |
1da177e4 LT |
18 | #include <linux/slab.h> |
19 | #include <linux/module.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/input.h> | |
22 | #include <linux/major.h> | |
1da177e4 | 23 | #include <linux/device.h> |
2d56f3a3 | 24 | #include "input-compat.h" |
1da177e4 LT |
25 | |
26 | struct evdev { | |
1da177e4 LT |
27 | int open; |
28 | int minor; | |
1da177e4 LT |
29 | struct input_handle handle; |
30 | wait_queue_head_t wait; | |
d0ffb9be DT |
31 | struct evdev_client *grab; |
32 | struct list_head client_list; | |
6addb1d6 DT |
33 | spinlock_t client_lock; /* protects client_list */ |
34 | struct mutex mutex; | |
9657d75c | 35 | struct device dev; |
20da92de | 36 | bool exist; |
1da177e4 LT |
37 | }; |
38 | ||
d0ffb9be | 39 | struct evdev_client { |
1da177e4 LT |
40 | int head; |
41 | int tail; | |
6addb1d6 | 42 | spinlock_t buffer_lock; /* protects access to buffer, head and tail */ |
1da177e4 LT |
43 | struct fasync_struct *fasync; |
44 | struct evdev *evdev; | |
45 | struct list_head node; | |
b58f7086 HR |
46 | int bufsize; |
47 | struct input_event buffer[]; | |
1da177e4 LT |
48 | }; |
49 | ||
50 | static struct evdev *evdev_table[EVDEV_MINORS]; | |
6addb1d6 | 51 | static DEFINE_MUTEX(evdev_table_mutex); |
1da177e4 | 52 | |
6addb1d6 DT |
53 | static void evdev_pass_event(struct evdev_client *client, |
54 | struct input_event *event) | |
55 | { | |
56 | /* | |
e725a494 HR |
57 | * Interrupts are disabled, just acquire the lock. |
58 | * Make sure we don't leave with the client buffer | |
59 | * "empty" by having client->head == client->tail. | |
6addb1d6 DT |
60 | */ |
61 | spin_lock(&client->buffer_lock); | |
e725a494 HR |
62 | do { |
63 | client->buffer[client->head++] = *event; | |
64 | client->head &= client->bufsize - 1; | |
65 | } while (client->head == client->tail); | |
6addb1d6 DT |
66 | spin_unlock(&client->buffer_lock); |
67 | ||
30a589fd AJ |
68 | if (event->type == EV_SYN) |
69 | kill_fasync(&client->fasync, SIGIO, POLL_IN); | |
6addb1d6 DT |
70 | } |
71 | ||
72 | /* | |
82ba56c2 | 73 | * Pass incoming event to all connected clients. |
6addb1d6 DT |
74 | */ |
75 | static void evdev_event(struct input_handle *handle, | |
76 | unsigned int type, unsigned int code, int value) | |
1da177e4 LT |
77 | { |
78 | struct evdev *evdev = handle->private; | |
d0ffb9be | 79 | struct evdev_client *client; |
6addb1d6 | 80 | struct input_event event; |
1da177e4 | 81 | |
6addb1d6 DT |
82 | do_gettimeofday(&event.time); |
83 | event.type = type; | |
84 | event.code = code; | |
85 | event.value = value; | |
1da177e4 | 86 | |
82ba56c2 DT |
87 | rcu_read_lock(); |
88 | ||
6addb1d6 DT |
89 | client = rcu_dereference(evdev->grab); |
90 | if (client) | |
91 | evdev_pass_event(client, &event); | |
92 | else | |
93 | list_for_each_entry_rcu(client, &evdev->client_list, node) | |
94 | evdev_pass_event(client, &event); | |
1da177e4 | 95 | |
82ba56c2 DT |
96 | rcu_read_unlock(); |
97 | ||
1da177e4 LT |
98 | wake_up_interruptible(&evdev->wait); |
99 | } | |
100 | ||
101 | static int evdev_fasync(int fd, struct file *file, int on) | |
102 | { | |
d0ffb9be | 103 | struct evdev_client *client = file->private_data; |
1e0afb28 | 104 | |
60aa4924 | 105 | return fasync_helper(fd, file, on, &client->fasync); |
1da177e4 LT |
106 | } |
107 | ||
1e0afb28 | 108 | static int evdev_flush(struct file *file, fl_owner_t id) |
1da177e4 | 109 | { |
d0ffb9be DT |
110 | struct evdev_client *client = file->private_data; |
111 | struct evdev *evdev = client->evdev; | |
6addb1d6 DT |
112 | int retval; |
113 | ||
114 | retval = mutex_lock_interruptible(&evdev->mutex); | |
115 | if (retval) | |
116 | return retval; | |
1e0afb28 | 117 | |
d0ffb9be | 118 | if (!evdev->exist) |
6addb1d6 DT |
119 | retval = -ENODEV; |
120 | else | |
121 | retval = input_flush_device(&evdev->handle, file); | |
1e0afb28 | 122 | |
6addb1d6 DT |
123 | mutex_unlock(&evdev->mutex); |
124 | return retval; | |
1da177e4 LT |
125 | } |
126 | ||
9657d75c | 127 | static void evdev_free(struct device *dev) |
1da177e4 | 128 | { |
9657d75c DT |
129 | struct evdev *evdev = container_of(dev, struct evdev, dev); |
130 | ||
a7097ff8 | 131 | input_put_device(evdev->handle.dev); |
1da177e4 LT |
132 | kfree(evdev); |
133 | } | |
134 | ||
6addb1d6 DT |
135 | /* |
136 | * Grabs an event device (along with underlying input device). | |
137 | * This function is called with evdev->mutex taken. | |
138 | */ | |
139 | static int evdev_grab(struct evdev *evdev, struct evdev_client *client) | |
140 | { | |
141 | int error; | |
142 | ||
143 | if (evdev->grab) | |
144 | return -EBUSY; | |
145 | ||
146 | error = input_grab_device(&evdev->handle); | |
147 | if (error) | |
148 | return error; | |
149 | ||
150 | rcu_assign_pointer(evdev->grab, client); | |
82ba56c2 | 151 | synchronize_rcu(); |
6addb1d6 DT |
152 | |
153 | return 0; | |
154 | } | |
155 | ||
156 | static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client) | |
157 | { | |
158 | if (evdev->grab != client) | |
159 | return -EINVAL; | |
160 | ||
161 | rcu_assign_pointer(evdev->grab, NULL); | |
82ba56c2 | 162 | synchronize_rcu(); |
6addb1d6 DT |
163 | input_release_device(&evdev->handle); |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
168 | static void evdev_attach_client(struct evdev *evdev, | |
169 | struct evdev_client *client) | |
170 | { | |
171 | spin_lock(&evdev->client_lock); | |
172 | list_add_tail_rcu(&client->node, &evdev->client_list); | |
173 | spin_unlock(&evdev->client_lock); | |
82ba56c2 | 174 | synchronize_rcu(); |
6addb1d6 DT |
175 | } |
176 | ||
177 | static void evdev_detach_client(struct evdev *evdev, | |
178 | struct evdev_client *client) | |
179 | { | |
180 | spin_lock(&evdev->client_lock); | |
181 | list_del_rcu(&client->node); | |
182 | spin_unlock(&evdev->client_lock); | |
82ba56c2 | 183 | synchronize_rcu(); |
6addb1d6 DT |
184 | } |
185 | ||
186 | static int evdev_open_device(struct evdev *evdev) | |
187 | { | |
188 | int retval; | |
189 | ||
190 | retval = mutex_lock_interruptible(&evdev->mutex); | |
191 | if (retval) | |
192 | return retval; | |
193 | ||
194 | if (!evdev->exist) | |
195 | retval = -ENODEV; | |
06445014 | 196 | else if (!evdev->open++) { |
6addb1d6 | 197 | retval = input_open_device(&evdev->handle); |
06445014 ON |
198 | if (retval) |
199 | evdev->open--; | |
200 | } | |
6addb1d6 DT |
201 | |
202 | mutex_unlock(&evdev->mutex); | |
203 | return retval; | |
204 | } | |
205 | ||
206 | static void evdev_close_device(struct evdev *evdev) | |
207 | { | |
208 | mutex_lock(&evdev->mutex); | |
209 | ||
210 | if (evdev->exist && !--evdev->open) | |
211 | input_close_device(&evdev->handle); | |
212 | ||
213 | mutex_unlock(&evdev->mutex); | |
214 | } | |
215 | ||
216 | /* | |
217 | * Wake up users waiting for IO so they can disconnect from | |
218 | * dead device. | |
219 | */ | |
220 | static void evdev_hangup(struct evdev *evdev) | |
221 | { | |
222 | struct evdev_client *client; | |
223 | ||
224 | spin_lock(&evdev->client_lock); | |
225 | list_for_each_entry(client, &evdev->client_list, node) | |
226 | kill_fasync(&client->fasync, SIGIO, POLL_HUP); | |
227 | spin_unlock(&evdev->client_lock); | |
228 | ||
229 | wake_up_interruptible(&evdev->wait); | |
230 | } | |
231 | ||
d0ffb9be | 232 | static int evdev_release(struct inode *inode, struct file *file) |
1da177e4 | 233 | { |
d0ffb9be DT |
234 | struct evdev_client *client = file->private_data; |
235 | struct evdev *evdev = client->evdev; | |
1da177e4 | 236 | |
6addb1d6 DT |
237 | mutex_lock(&evdev->mutex); |
238 | if (evdev->grab == client) | |
239 | evdev_ungrab(evdev, client); | |
240 | mutex_unlock(&evdev->mutex); | |
1da177e4 | 241 | |
6addb1d6 | 242 | evdev_detach_client(evdev, client); |
d0ffb9be | 243 | kfree(client); |
1da177e4 | 244 | |
6addb1d6 | 245 | evdev_close_device(evdev); |
9657d75c | 246 | put_device(&evdev->dev); |
1da177e4 | 247 | |
1da177e4 LT |
248 | return 0; |
249 | } | |
250 | ||
b58f7086 HR |
251 | static unsigned int evdev_compute_buffer_size(struct input_dev *dev) |
252 | { | |
63a6404d HR |
253 | unsigned int n_events = |
254 | max(dev->hint_events_per_packet * EVDEV_BUF_PACKETS, | |
255 | EVDEV_MIN_BUFFER_SIZE); | |
256 | ||
257 | return roundup_pow_of_two(n_events); | |
b58f7086 HR |
258 | } |
259 | ||
d0ffb9be | 260 | static int evdev_open(struct inode *inode, struct file *file) |
1da177e4 | 261 | { |
d0ffb9be | 262 | struct evdev *evdev; |
6addb1d6 | 263 | struct evdev_client *client; |
1da177e4 | 264 | int i = iminor(inode) - EVDEV_MINOR_BASE; |
b58f7086 | 265 | unsigned int bufsize; |
d542ed82 | 266 | int error; |
1da177e4 | 267 | |
d0ffb9be | 268 | if (i >= EVDEV_MINORS) |
1da177e4 LT |
269 | return -ENODEV; |
270 | ||
6addb1d6 DT |
271 | error = mutex_lock_interruptible(&evdev_table_mutex); |
272 | if (error) | |
273 | return error; | |
d0ffb9be | 274 | evdev = evdev_table[i]; |
6addb1d6 DT |
275 | if (evdev) |
276 | get_device(&evdev->dev); | |
277 | mutex_unlock(&evdev_table_mutex); | |
d0ffb9be | 278 | |
6addb1d6 | 279 | if (!evdev) |
1da177e4 LT |
280 | return -ENODEV; |
281 | ||
b58f7086 HR |
282 | bufsize = evdev_compute_buffer_size(evdev->handle.dev); |
283 | ||
284 | client = kzalloc(sizeof(struct evdev_client) + | |
285 | bufsize * sizeof(struct input_event), | |
286 | GFP_KERNEL); | |
9657d75c DT |
287 | if (!client) { |
288 | error = -ENOMEM; | |
289 | goto err_put_evdev; | |
290 | } | |
1da177e4 | 291 | |
b58f7086 | 292 | client->bufsize = bufsize; |
6addb1d6 | 293 | spin_lock_init(&client->buffer_lock); |
d0ffb9be | 294 | client->evdev = evdev; |
6addb1d6 | 295 | evdev_attach_client(evdev, client); |
1da177e4 | 296 | |
6addb1d6 DT |
297 | error = evdev_open_device(evdev); |
298 | if (error) | |
299 | goto err_free_client; | |
1da177e4 | 300 | |
d0ffb9be | 301 | file->private_data = client; |
3d7bbd45 DT |
302 | nonseekable_open(inode, file); |
303 | ||
1da177e4 | 304 | return 0; |
9657d75c DT |
305 | |
306 | err_free_client: | |
6addb1d6 | 307 | evdev_detach_client(evdev, client); |
9657d75c DT |
308 | kfree(client); |
309 | err_put_evdev: | |
310 | put_device(&evdev->dev); | |
311 | return error; | |
1da177e4 LT |
312 | } |
313 | ||
6addb1d6 DT |
314 | static ssize_t evdev_write(struct file *file, const char __user *buffer, |
315 | size_t count, loff_t *ppos) | |
3a51f7c4 | 316 | { |
d0ffb9be DT |
317 | struct evdev_client *client = file->private_data; |
318 | struct evdev *evdev = client->evdev; | |
3a51f7c4 | 319 | struct input_event event; |
6addb1d6 | 320 | int retval; |
52658bb6 | 321 | |
6addb1d6 DT |
322 | retval = mutex_lock_interruptible(&evdev->mutex); |
323 | if (retval) | |
324 | return retval; | |
325 | ||
326 | if (!evdev->exist) { | |
327 | retval = -ENODEV; | |
328 | goto out; | |
329 | } | |
52658bb6 | 330 | |
3a51f7c4 DT |
331 | while (retval < count) { |
332 | ||
2d56f3a3 | 333 | if (input_event_from_user(buffer + retval, &event)) { |
6addb1d6 DT |
334 | retval = -EFAULT; |
335 | goto out; | |
336 | } | |
337 | ||
338 | input_inject_event(&evdev->handle, | |
339 | event.type, event.code, event.value); | |
2d56f3a3 | 340 | retval += input_event_size(); |
52658bb6 JK |
341 | } |
342 | ||
6addb1d6 DT |
343 | out: |
344 | mutex_unlock(&evdev->mutex); | |
52658bb6 JK |
345 | return retval; |
346 | } | |
52658bb6 | 347 | |
6addb1d6 DT |
348 | static int evdev_fetch_next_event(struct evdev_client *client, |
349 | struct input_event *event) | |
350 | { | |
351 | int have_event; | |
352 | ||
353 | spin_lock_irq(&client->buffer_lock); | |
354 | ||
355 | have_event = client->head != client->tail; | |
356 | if (have_event) { | |
357 | *event = client->buffer[client->tail++]; | |
b58f7086 | 358 | client->tail &= client->bufsize - 1; |
6addb1d6 DT |
359 | } |
360 | ||
361 | spin_unlock_irq(&client->buffer_lock); | |
362 | ||
363 | return have_event; | |
364 | } | |
365 | ||
366 | static ssize_t evdev_read(struct file *file, char __user *buffer, | |
367 | size_t count, loff_t *ppos) | |
1da177e4 | 368 | { |
d0ffb9be DT |
369 | struct evdev_client *client = file->private_data; |
370 | struct evdev *evdev = client->evdev; | |
6addb1d6 | 371 | struct input_event event; |
1da177e4 LT |
372 | int retval; |
373 | ||
2d56f3a3 | 374 | if (count < input_event_size()) |
1da177e4 LT |
375 | return -EINVAL; |
376 | ||
6addb1d6 DT |
377 | if (client->head == client->tail && evdev->exist && |
378 | (file->f_flags & O_NONBLOCK)) | |
1da177e4 LT |
379 | return -EAGAIN; |
380 | ||
d0ffb9be DT |
381 | retval = wait_event_interruptible(evdev->wait, |
382 | client->head != client->tail || !evdev->exist); | |
1da177e4 LT |
383 | if (retval) |
384 | return retval; | |
385 | ||
d0ffb9be | 386 | if (!evdev->exist) |
1da177e4 LT |
387 | return -ENODEV; |
388 | ||
2d56f3a3 | 389 | while (retval + input_event_size() <= count && |
6addb1d6 | 390 | evdev_fetch_next_event(client, &event)) { |
3a51f7c4 | 391 | |
2d56f3a3 | 392 | if (input_event_to_user(buffer + retval, &event)) |
3a51f7c4 DT |
393 | return -EFAULT; |
394 | ||
2d56f3a3 | 395 | retval += input_event_size(); |
1da177e4 LT |
396 | } |
397 | ||
398 | return retval; | |
399 | } | |
400 | ||
401 | /* No kernel lock - fine */ | |
402 | static unsigned int evdev_poll(struct file *file, poll_table *wait) | |
403 | { | |
d0ffb9be DT |
404 | struct evdev_client *client = file->private_data; |
405 | struct evdev *evdev = client->evdev; | |
c18fb139 | 406 | unsigned int mask; |
1e0afb28 | 407 | |
d0ffb9be | 408 | poll_wait(file, &evdev->wait, wait); |
c18fb139 DT |
409 | |
410 | mask = evdev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR; | |
411 | if (client->head != client->tail) | |
412 | mask |= POLLIN | POLLRDNORM; | |
413 | ||
414 | return mask; | |
1da177e4 LT |
415 | } |
416 | ||
3a51f7c4 DT |
417 | #ifdef CONFIG_COMPAT |
418 | ||
419 | #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) | |
7b19ada2 | 420 | #define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1) |
3a51f7c4 DT |
421 | |
422 | #ifdef __BIG_ENDIAN | |
423 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
424 | unsigned int maxlen, void __user *p, int compat) | |
425 | { | |
426 | int len, i; | |
427 | ||
428 | if (compat) { | |
7b19ada2 | 429 | len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t); |
bf61f8d3 | 430 | if (len > maxlen) |
3a51f7c4 DT |
431 | len = maxlen; |
432 | ||
433 | for (i = 0; i < len / sizeof(compat_long_t); i++) | |
434 | if (copy_to_user((compat_long_t __user *) p + i, | |
435 | (compat_long_t *) bits + | |
436 | i + 1 - ((i % 2) << 1), | |
437 | sizeof(compat_long_t))) | |
438 | return -EFAULT; | |
439 | } else { | |
7b19ada2 | 440 | len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
441 | if (len > maxlen) |
442 | len = maxlen; | |
443 | ||
444 | if (copy_to_user(p, bits, len)) | |
445 | return -EFAULT; | |
446 | } | |
447 | ||
448 | return len; | |
449 | } | |
450 | #else | |
451 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
452 | unsigned int maxlen, void __user *p, int compat) | |
453 | { | |
454 | int len = compat ? | |
7b19ada2 JS |
455 | BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) : |
456 | BITS_TO_LONGS(maxbit) * sizeof(long); | |
3a51f7c4 DT |
457 | |
458 | if (len > maxlen) | |
459 | len = maxlen; | |
460 | ||
461 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
462 | } | |
463 | #endif /* __BIG_ENDIAN */ | |
464 | ||
465 | #else | |
466 | ||
467 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
468 | unsigned int maxlen, void __user *p, int compat) | |
469 | { | |
7b19ada2 | 470 | int len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
471 | |
472 | if (len > maxlen) | |
473 | len = maxlen; | |
474 | ||
475 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
476 | } | |
477 | ||
478 | #endif /* CONFIG_COMPAT */ | |
479 | ||
480 | static int str_to_user(const char *str, unsigned int maxlen, void __user *p) | |
481 | { | |
482 | int len; | |
483 | ||
484 | if (!str) | |
485 | return -ENOENT; | |
486 | ||
487 | len = strlen(str) + 1; | |
488 | if (len > maxlen) | |
489 | len = maxlen; | |
490 | ||
491 | return copy_to_user(p, str, len) ? -EFAULT : len; | |
492 | } | |
493 | ||
f2afa771 | 494 | #define OLD_KEY_MAX 0x1ff |
5402a734 LT |
495 | static int handle_eviocgbit(struct input_dev *dev, unsigned int cmd, void __user *p, int compat_mode) |
496 | { | |
f2afa771 | 497 | static unsigned long keymax_warn_time; |
5402a734 LT |
498 | unsigned long *bits; |
499 | int len; | |
500 | ||
501 | switch (_IOC_NR(cmd) & EV_MAX) { | |
502 | ||
503 | case 0: bits = dev->evbit; len = EV_MAX; break; | |
504 | case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; | |
505 | case EV_REL: bits = dev->relbit; len = REL_MAX; break; | |
506 | case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; | |
507 | case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; | |
508 | case EV_LED: bits = dev->ledbit; len = LED_MAX; break; | |
509 | case EV_SND: bits = dev->sndbit; len = SND_MAX; break; | |
510 | case EV_FF: bits = dev->ffbit; len = FF_MAX; break; | |
511 | case EV_SW: bits = dev->swbit; len = SW_MAX; break; | |
512 | default: return -EINVAL; | |
513 | } | |
f2afa771 DT |
514 | |
515 | /* | |
516 | * Work around bugs in userspace programs that like to do | |
517 | * EVIOCGBIT(EV_KEY, KEY_MAX) and not realize that 'len' | |
518 | * should be in bytes, not in bits. | |
519 | */ | |
520 | if ((_IOC_NR(cmd) & EV_MAX) == EV_KEY && _IOC_SIZE(cmd) == OLD_KEY_MAX) { | |
521 | len = OLD_KEY_MAX; | |
522 | if (printk_timed_ratelimit(&keymax_warn_time, 10 * 1000)) | |
523 | printk(KERN_WARNING | |
c85e2031 GU |
524 | "evdev.c(EVIOCGBIT): Suspicious buffer size %u, " |
525 | "limiting output to %zu bytes. See " | |
f2afa771 DT |
526 | "http://userweb.kernel.org/~dtor/eviocgbit-bug.html\n", |
527 | OLD_KEY_MAX, | |
528 | BITS_TO_LONGS(OLD_KEY_MAX) * sizeof(long)); | |
529 | } | |
530 | ||
5402a734 LT |
531 | return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode); |
532 | } | |
f2afa771 | 533 | #undef OLD_KEY_MAX |
5402a734 | 534 | |
6addb1d6 DT |
535 | static long evdev_do_ioctl(struct file *file, unsigned int cmd, |
536 | void __user *p, int compat_mode) | |
1da177e4 | 537 | { |
d0ffb9be DT |
538 | struct evdev_client *client = file->private_data; |
539 | struct evdev *evdev = client->evdev; | |
1da177e4 LT |
540 | struct input_dev *dev = evdev->handle.dev; |
541 | struct input_absinfo abs; | |
509ca1a9 | 542 | struct ff_effect effect; |
3a51f7c4 | 543 | int __user *ip = (int __user *)p; |
58b93995 | 544 | unsigned int i, t, u, v; |
509ca1a9 | 545 | int error; |
1da177e4 | 546 | |
1da177e4 LT |
547 | switch (cmd) { |
548 | ||
6addb1d6 DT |
549 | case EVIOCGVERSION: |
550 | return put_user(EV_VERSION, ip); | |
1da177e4 | 551 | |
6addb1d6 DT |
552 | case EVIOCGID: |
553 | if (copy_to_user(p, &dev->id, sizeof(struct input_id))) | |
554 | return -EFAULT; | |
555 | return 0; | |
08791e5c | 556 | |
6addb1d6 DT |
557 | case EVIOCGREP: |
558 | if (!test_bit(EV_REP, dev->evbit)) | |
559 | return -ENOSYS; | |
560 | if (put_user(dev->rep[REP_DELAY], ip)) | |
561 | return -EFAULT; | |
562 | if (put_user(dev->rep[REP_PERIOD], ip + 1)) | |
563 | return -EFAULT; | |
564 | return 0; | |
08791e5c | 565 | |
6addb1d6 DT |
566 | case EVIOCSREP: |
567 | if (!test_bit(EV_REP, dev->evbit)) | |
568 | return -ENOSYS; | |
569 | if (get_user(u, ip)) | |
570 | return -EFAULT; | |
571 | if (get_user(v, ip + 1)) | |
572 | return -EFAULT; | |
08791e5c | 573 | |
6addb1d6 DT |
574 | input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u); |
575 | input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v); | |
3a51f7c4 | 576 | |
6addb1d6 | 577 | return 0; |
1da177e4 | 578 | |
6addb1d6 DT |
579 | case EVIOCGKEYCODE: |
580 | if (get_user(t, ip)) | |
581 | return -EFAULT; | |
c8e4c772 | 582 | |
f4f37c8e | 583 | error = input_get_keycode(dev, t, &v); |
6addb1d6 DT |
584 | if (error) |
585 | return error; | |
c8e4c772 | 586 | |
6addb1d6 DT |
587 | if (put_user(v, ip + 1)) |
588 | return -EFAULT; | |
c8e4c772 | 589 | |
6addb1d6 | 590 | return 0; |
1da177e4 | 591 | |
6addb1d6 DT |
592 | case EVIOCSKEYCODE: |
593 | if (get_user(t, ip) || get_user(v, ip + 1)) | |
594 | return -EFAULT; | |
3a51f7c4 | 595 | |
f4f37c8e | 596 | return input_set_keycode(dev, t, v); |
1da177e4 | 597 | |
6addb1d6 DT |
598 | case EVIOCRMFF: |
599 | return input_ff_erase(dev, (int)(unsigned long) p, file); | |
1da177e4 | 600 | |
6addb1d6 DT |
601 | case EVIOCGEFFECTS: |
602 | i = test_bit(EV_FF, dev->evbit) ? | |
603 | dev->ff->max_effects : 0; | |
604 | if (put_user(i, ip)) | |
605 | return -EFAULT; | |
606 | return 0; | |
607 | ||
608 | case EVIOCGRAB: | |
609 | if (p) | |
610 | return evdev_grab(evdev, client); | |
611 | else | |
612 | return evdev_ungrab(evdev, client); | |
1da177e4 | 613 | |
6addb1d6 | 614 | default: |
1da177e4 | 615 | |
6addb1d6 DT |
616 | if (_IOC_TYPE(cmd) != 'E') |
617 | return -EINVAL; | |
1da177e4 | 618 | |
6addb1d6 | 619 | if (_IOC_DIR(cmd) == _IOC_READ) { |
41e979f8 | 620 | |
5402a734 LT |
621 | if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0))) |
622 | return handle_eviocgbit(dev, cmd, p, compat_mode); | |
1da177e4 | 623 | |
6addb1d6 DT |
624 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) |
625 | return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd), | |
626 | p, compat_mode); | |
1da177e4 | 627 | |
6addb1d6 DT |
628 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) |
629 | return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd), | |
630 | p, compat_mode); | |
1da177e4 | 631 | |
6addb1d6 DT |
632 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) |
633 | return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd), | |
634 | p, compat_mode); | |
31581066 | 635 | |
6addb1d6 DT |
636 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0))) |
637 | return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd), | |
638 | p, compat_mode); | |
1da177e4 | 639 | |
6addb1d6 | 640 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) |
f9366014 | 641 | return str_to_user(dev->name, _IOC_SIZE(cmd), p); |
1da177e4 | 642 | |
6addb1d6 DT |
643 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) |
644 | return str_to_user(dev->phys, _IOC_SIZE(cmd), p); | |
1da177e4 | 645 | |
6addb1d6 DT |
646 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) |
647 | return str_to_user(dev->uniq, _IOC_SIZE(cmd), p); | |
1da177e4 | 648 | |
6addb1d6 | 649 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { |
1da177e4 | 650 | |
6addb1d6 | 651 | t = _IOC_NR(cmd) & ABS_MAX; |
1da177e4 | 652 | |
6addb1d6 DT |
653 | abs.value = dev->abs[t]; |
654 | abs.minimum = dev->absmin[t]; | |
655 | abs.maximum = dev->absmax[t]; | |
656 | abs.fuzz = dev->absfuzz[t]; | |
657 | abs.flat = dev->absflat[t]; | |
ec20a022 | 658 | abs.resolution = dev->absres[t]; |
41e979f8 | 659 | |
ec20a022 TS |
660 | if (copy_to_user(p, &abs, min_t(size_t, |
661 | _IOC_SIZE(cmd), | |
662 | sizeof(struct input_absinfo)))) | |
6addb1d6 | 663 | return -EFAULT; |
1da177e4 | 664 | |
6addb1d6 | 665 | return 0; |
1da177e4 LT |
666 | } |
667 | ||
6addb1d6 DT |
668 | } |
669 | ||
670 | if (_IOC_DIR(cmd) == _IOC_WRITE) { | |
1da177e4 | 671 | |
f2278f31 AD |
672 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCSFF)) { |
673 | ||
2d56f3a3 | 674 | if (input_ff_effect_from_user(p, _IOC_SIZE(cmd), &effect)) |
f2278f31 AD |
675 | return -EFAULT; |
676 | ||
677 | error = input_ff_upload(dev, &effect, file); | |
678 | ||
679 | if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) | |
680 | return -EFAULT; | |
681 | ||
682 | return error; | |
683 | } | |
684 | ||
6addb1d6 | 685 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { |
1da177e4 | 686 | |
6addb1d6 | 687 | t = _IOC_NR(cmd) & ABS_MAX; |
41e979f8 | 688 | |
ec20a022 TS |
689 | if (copy_from_user(&abs, p, min_t(size_t, |
690 | _IOC_SIZE(cmd), | |
691 | sizeof(struct input_absinfo)))) | |
6addb1d6 | 692 | return -EFAULT; |
1da177e4 | 693 | |
40d007e7 HR |
694 | /* We can't change number of reserved MT slots */ |
695 | if (t == ABS_MT_SLOT) | |
696 | return -EINVAL; | |
697 | ||
6addb1d6 DT |
698 | /* |
699 | * Take event lock to ensure that we are not | |
700 | * changing device parameters in the middle | |
701 | * of event. | |
702 | */ | |
703 | spin_lock_irq(&dev->event_lock); | |
1da177e4 | 704 | |
6addb1d6 DT |
705 | dev->abs[t] = abs.value; |
706 | dev->absmin[t] = abs.minimum; | |
707 | dev->absmax[t] = abs.maximum; | |
708 | dev->absfuzz[t] = abs.fuzz; | |
709 | dev->absflat[t] = abs.flat; | |
ec20a022 TS |
710 | dev->absres[t] = _IOC_SIZE(cmd) < sizeof(struct input_absinfo) ? |
711 | 0 : abs.resolution; | |
6addb1d6 DT |
712 | |
713 | spin_unlock_irq(&dev->event_lock); | |
714 | ||
715 | return 0; | |
1da177e4 | 716 | } |
6addb1d6 | 717 | } |
1da177e4 LT |
718 | } |
719 | return -EINVAL; | |
720 | } | |
1da177e4 | 721 | |
6addb1d6 DT |
722 | static long evdev_ioctl_handler(struct file *file, unsigned int cmd, |
723 | void __user *p, int compat_mode) | |
724 | { | |
725 | struct evdev_client *client = file->private_data; | |
726 | struct evdev *evdev = client->evdev; | |
727 | int retval; | |
728 | ||
729 | retval = mutex_lock_interruptible(&evdev->mutex); | |
730 | if (retval) | |
731 | return retval; | |
732 | ||
733 | if (!evdev->exist) { | |
734 | retval = -ENODEV; | |
735 | goto out; | |
736 | } | |
737 | ||
738 | retval = evdev_do_ioctl(file, cmd, p, compat_mode); | |
739 | ||
740 | out: | |
741 | mutex_unlock(&evdev->mutex); | |
742 | return retval; | |
743 | } | |
744 | ||
3a51f7c4 DT |
745 | static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
746 | { | |
747 | return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0); | |
748 | } | |
41e979f8 | 749 | |
3a51f7c4 | 750 | #ifdef CONFIG_COMPAT |
6addb1d6 DT |
751 | static long evdev_ioctl_compat(struct file *file, |
752 | unsigned int cmd, unsigned long arg) | |
52658bb6 | 753 | { |
3a51f7c4 | 754 | return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1); |
1da177e4 | 755 | } |
52658bb6 | 756 | #endif |
1da177e4 | 757 | |
66e66118 | 758 | static const struct file_operations evdev_fops = { |
6addb1d6 DT |
759 | .owner = THIS_MODULE, |
760 | .read = evdev_read, | |
761 | .write = evdev_write, | |
762 | .poll = evdev_poll, | |
763 | .open = evdev_open, | |
764 | .release = evdev_release, | |
765 | .unlocked_ioctl = evdev_ioctl, | |
52658bb6 | 766 | #ifdef CONFIG_COMPAT |
6addb1d6 | 767 | .compat_ioctl = evdev_ioctl_compat, |
52658bb6 | 768 | #endif |
6addb1d6 DT |
769 | .fasync = evdev_fasync, |
770 | .flush = evdev_flush | |
1da177e4 LT |
771 | }; |
772 | ||
6addb1d6 DT |
773 | static int evdev_install_chrdev(struct evdev *evdev) |
774 | { | |
775 | /* | |
776 | * No need to do any locking here as calls to connect and | |
777 | * disconnect are serialized by the input core | |
778 | */ | |
779 | evdev_table[evdev->minor] = evdev; | |
780 | return 0; | |
781 | } | |
782 | ||
783 | static void evdev_remove_chrdev(struct evdev *evdev) | |
784 | { | |
785 | /* | |
786 | * Lock evdev table to prevent race with evdev_open() | |
787 | */ | |
788 | mutex_lock(&evdev_table_mutex); | |
789 | evdev_table[evdev->minor] = NULL; | |
790 | mutex_unlock(&evdev_table_mutex); | |
791 | } | |
792 | ||
793 | /* | |
794 | * Mark device non-existent. This disables writes, ioctls and | |
795 | * prevents new users from opening the device. Already posted | |
796 | * blocking reads will stay, however new ones will fail. | |
797 | */ | |
798 | static void evdev_mark_dead(struct evdev *evdev) | |
799 | { | |
800 | mutex_lock(&evdev->mutex); | |
20da92de | 801 | evdev->exist = false; |
6addb1d6 DT |
802 | mutex_unlock(&evdev->mutex); |
803 | } | |
804 | ||
805 | static void evdev_cleanup(struct evdev *evdev) | |
806 | { | |
807 | struct input_handle *handle = &evdev->handle; | |
808 | ||
809 | evdev_mark_dead(evdev); | |
810 | evdev_hangup(evdev); | |
811 | evdev_remove_chrdev(evdev); | |
812 | ||
813 | /* evdev is marked dead so no one else accesses evdev->open */ | |
814 | if (evdev->open) { | |
815 | input_flush_device(handle, NULL); | |
816 | input_close_device(handle); | |
817 | } | |
818 | } | |
819 | ||
820 | /* | |
821 | * Create new evdev device. Note that input core serializes calls | |
822 | * to connect and disconnect so we don't need to lock evdev_table here. | |
823 | */ | |
5b2a0826 DT |
824 | static int evdev_connect(struct input_handler *handler, struct input_dev *dev, |
825 | const struct input_device_id *id) | |
1da177e4 LT |
826 | { |
827 | struct evdev *evdev; | |
828 | int minor; | |
5b2a0826 | 829 | int error; |
1da177e4 | 830 | |
6addb1d6 DT |
831 | for (minor = 0; minor < EVDEV_MINORS; minor++) |
832 | if (!evdev_table[minor]) | |
833 | break; | |
834 | ||
1da177e4 LT |
835 | if (minor == EVDEV_MINORS) { |
836 | printk(KERN_ERR "evdev: no more free evdev devices\n"); | |
5b2a0826 | 837 | return -ENFILE; |
1da177e4 LT |
838 | } |
839 | ||
5b2a0826 DT |
840 | evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL); |
841 | if (!evdev) | |
842 | return -ENOMEM; | |
1da177e4 | 843 | |
d0ffb9be | 844 | INIT_LIST_HEAD(&evdev->client_list); |
6addb1d6 DT |
845 | spin_lock_init(&evdev->client_lock); |
846 | mutex_init(&evdev->mutex); | |
1da177e4 LT |
847 | init_waitqueue_head(&evdev->wait); |
848 | ||
3d5cb60e | 849 | dev_set_name(&evdev->dev, "event%d", minor); |
20da92de | 850 | evdev->exist = true; |
1da177e4 | 851 | evdev->minor = minor; |
6addb1d6 | 852 | |
a7097ff8 | 853 | evdev->handle.dev = input_get_device(dev); |
3d5cb60e | 854 | evdev->handle.name = dev_name(&evdev->dev); |
1da177e4 LT |
855 | evdev->handle.handler = handler; |
856 | evdev->handle.private = evdev; | |
1da177e4 | 857 | |
6addb1d6 | 858 | evdev->dev.devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor); |
9657d75c DT |
859 | evdev->dev.class = &input_class; |
860 | evdev->dev.parent = &dev->dev; | |
9657d75c DT |
861 | evdev->dev.release = evdev_free; |
862 | device_initialize(&evdev->dev); | |
5b2a0826 | 863 | |
6addb1d6 | 864 | error = input_register_handle(&evdev->handle); |
5b2a0826 | 865 | if (error) |
9657d75c | 866 | goto err_free_evdev; |
5b2a0826 | 867 | |
6addb1d6 DT |
868 | error = evdev_install_chrdev(evdev); |
869 | if (error) | |
870 | goto err_unregister_handle; | |
871 | ||
872 | error = device_add(&evdev->dev); | |
5b2a0826 | 873 | if (error) |
6addb1d6 | 874 | goto err_cleanup_evdev; |
1da177e4 | 875 | |
5b2a0826 | 876 | return 0; |
1da177e4 | 877 | |
6addb1d6 DT |
878 | err_cleanup_evdev: |
879 | evdev_cleanup(evdev); | |
880 | err_unregister_handle: | |
881 | input_unregister_handle(&evdev->handle); | |
5b2a0826 | 882 | err_free_evdev: |
9657d75c | 883 | put_device(&evdev->dev); |
5b2a0826 | 884 | return error; |
1da177e4 LT |
885 | } |
886 | ||
887 | static void evdev_disconnect(struct input_handle *handle) | |
888 | { | |
889 | struct evdev *evdev = handle->private; | |
1da177e4 | 890 | |
9657d75c | 891 | device_del(&evdev->dev); |
6addb1d6 DT |
892 | evdev_cleanup(evdev); |
893 | input_unregister_handle(handle); | |
9657d75c | 894 | put_device(&evdev->dev); |
1da177e4 LT |
895 | } |
896 | ||
66e66118 | 897 | static const struct input_device_id evdev_ids[] = { |
1da177e4 LT |
898 | { .driver_info = 1 }, /* Matches all devices */ |
899 | { }, /* Terminating zero entry */ | |
900 | }; | |
901 | ||
902 | MODULE_DEVICE_TABLE(input, evdev_ids); | |
903 | ||
904 | static struct input_handler evdev_handler = { | |
6addb1d6 DT |
905 | .event = evdev_event, |
906 | .connect = evdev_connect, | |
907 | .disconnect = evdev_disconnect, | |
908 | .fops = &evdev_fops, | |
909 | .minor = EVDEV_MINOR_BASE, | |
910 | .name = "evdev", | |
911 | .id_table = evdev_ids, | |
1da177e4 LT |
912 | }; |
913 | ||
914 | static int __init evdev_init(void) | |
915 | { | |
4263cf0f | 916 | return input_register_handler(&evdev_handler); |
1da177e4 LT |
917 | } |
918 | ||
919 | static void __exit evdev_exit(void) | |
920 | { | |
921 | input_unregister_handler(&evdev_handler); | |
922 | } | |
923 | ||
924 | module_init(evdev_init); | |
925 | module_exit(evdev_exit); | |
926 | ||
927 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
928 | MODULE_DESCRIPTION("Input driver event char devices"); | |
929 | MODULE_LICENSE("GPL"); |