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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> | |
1cf0c6e6 | 23 | #include <linux/input/mt.h> |
1da177e4 | 24 | #include <linux/major.h> |
1da177e4 | 25 | #include <linux/device.h> |
7f8d4cad | 26 | #include <linux/cdev.h> |
2d56f3a3 | 27 | #include "input-compat.h" |
1da177e4 LT |
28 | |
29 | struct evdev { | |
1da177e4 | 30 | int open; |
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; |
7f8d4cad | 38 | struct cdev cdev; |
20da92de | 39 | bool exist; |
1da177e4 LT |
40 | }; |
41 | ||
d0ffb9be | 42 | struct evdev_client { |
9fb0f14e JB |
43 | unsigned int head; |
44 | unsigned int tail; | |
cdda911c | 45 | unsigned int packet_head; /* [future] position of the first element of next packet */ |
6addb1d6 | 46 | spinlock_t buffer_lock; /* protects access to buffer, head and tail */ |
1da177e4 LT |
47 | struct fasync_struct *fasync; |
48 | struct evdev *evdev; | |
49 | struct list_head node; | |
a80b83b7 | 50 | int clkid; |
9fb0f14e | 51 | unsigned int bufsize; |
b58f7086 | 52 | struct input_event buffer[]; |
1da177e4 LT |
53 | }; |
54 | ||
a274ac15 HR |
55 | static void __pass_event(struct evdev_client *client, |
56 | const struct input_event *event) | |
6addb1d6 | 57 | { |
9fb0f14e JB |
58 | client->buffer[client->head++] = *event; |
59 | client->head &= client->bufsize - 1; | |
60 | ||
61 | if (unlikely(client->head == client->tail)) { | |
62 | /* | |
63 | * This effectively "drops" all unconsumed events, leaving | |
64 | * EV_SYN/SYN_DROPPED plus the newest event in the queue. | |
65 | */ | |
66 | client->tail = (client->head - 2) & (client->bufsize - 1); | |
67 | ||
68 | client->buffer[client->tail].time = event->time; | |
69 | client->buffer[client->tail].type = EV_SYN; | |
70 | client->buffer[client->tail].code = SYN_DROPPED; | |
71 | client->buffer[client->tail].value = 0; | |
9fb0f14e | 72 | |
cdda911c JB |
73 | client->packet_head = client->tail; |
74 | } | |
6addb1d6 | 75 | |
cdda911c JB |
76 | if (event->type == EV_SYN && event->code == SYN_REPORT) { |
77 | client->packet_head = client->head; | |
30a589fd | 78 | kill_fasync(&client->fasync, SIGIO, POLL_IN); |
cdda911c | 79 | } |
a274ac15 HR |
80 | } |
81 | ||
82 | static void evdev_pass_values(struct evdev_client *client, | |
83 | const struct input_value *vals, unsigned int count, | |
84 | ktime_t mono, ktime_t real) | |
85 | { | |
86 | struct evdev *evdev = client->evdev; | |
87 | const struct input_value *v; | |
88 | struct input_event event; | |
89 | bool wakeup = false; | |
90 | ||
91 | event.time = ktime_to_timeval(client->clkid == CLOCK_MONOTONIC ? | |
92 | mono : real); | |
93 | ||
94 | /* Interrupts are disabled, just acquire the lock. */ | |
95 | spin_lock(&client->buffer_lock); | |
96 | ||
97 | for (v = vals; v != vals + count; v++) { | |
98 | event.type = v->type; | |
99 | event.code = v->code; | |
100 | event.value = v->value; | |
101 | __pass_event(client, &event); | |
102 | if (v->type == EV_SYN && v->code == SYN_REPORT) | |
103 | wakeup = true; | |
104 | } | |
cdda911c JB |
105 | |
106 | spin_unlock(&client->buffer_lock); | |
a274ac15 HR |
107 | |
108 | if (wakeup) | |
109 | wake_up_interruptible(&evdev->wait); | |
6addb1d6 DT |
110 | } |
111 | ||
112 | /* | |
a274ac15 | 113 | * Pass incoming events to all connected clients. |
6addb1d6 | 114 | */ |
a274ac15 HR |
115 | static void evdev_events(struct input_handle *handle, |
116 | const struct input_value *vals, unsigned int count) | |
1da177e4 LT |
117 | { |
118 | struct evdev *evdev = handle->private; | |
d0ffb9be | 119 | struct evdev_client *client; |
a80b83b7 JS |
120 | ktime_t time_mono, time_real; |
121 | ||
122 | time_mono = ktime_get(); | |
123 | time_real = ktime_sub(time_mono, ktime_get_monotonic_offset()); | |
1da177e4 | 124 | |
82ba56c2 DT |
125 | rcu_read_lock(); |
126 | ||
6addb1d6 | 127 | client = rcu_dereference(evdev->grab); |
a80b83b7 | 128 | |
6addb1d6 | 129 | if (client) |
a274ac15 | 130 | evdev_pass_values(client, vals, count, time_mono, time_real); |
6addb1d6 DT |
131 | else |
132 | list_for_each_entry_rcu(client, &evdev->client_list, node) | |
a274ac15 HR |
133 | evdev_pass_values(client, vals, count, |
134 | time_mono, time_real); | |
1da177e4 | 135 | |
82ba56c2 | 136 | rcu_read_unlock(); |
a274ac15 | 137 | } |
82ba56c2 | 138 | |
a274ac15 HR |
139 | /* |
140 | * Pass incoming event to all connected clients. | |
141 | */ | |
142 | static void evdev_event(struct input_handle *handle, | |
143 | unsigned int type, unsigned int code, int value) | |
144 | { | |
145 | struct input_value vals[] = { { type, code, value } }; | |
146 | ||
147 | evdev_events(handle, vals, 1); | |
1da177e4 LT |
148 | } |
149 | ||
150 | static int evdev_fasync(int fd, struct file *file, int on) | |
151 | { | |
d0ffb9be | 152 | struct evdev_client *client = file->private_data; |
1e0afb28 | 153 | |
60aa4924 | 154 | return fasync_helper(fd, file, on, &client->fasync); |
1da177e4 LT |
155 | } |
156 | ||
1e0afb28 | 157 | static int evdev_flush(struct file *file, fl_owner_t id) |
1da177e4 | 158 | { |
d0ffb9be DT |
159 | struct evdev_client *client = file->private_data; |
160 | struct evdev *evdev = client->evdev; | |
6addb1d6 DT |
161 | int retval; |
162 | ||
163 | retval = mutex_lock_interruptible(&evdev->mutex); | |
164 | if (retval) | |
165 | return retval; | |
1e0afb28 | 166 | |
d0ffb9be | 167 | if (!evdev->exist) |
6addb1d6 DT |
168 | retval = -ENODEV; |
169 | else | |
170 | retval = input_flush_device(&evdev->handle, file); | |
1e0afb28 | 171 | |
6addb1d6 DT |
172 | mutex_unlock(&evdev->mutex); |
173 | return retval; | |
1da177e4 LT |
174 | } |
175 | ||
9657d75c | 176 | static void evdev_free(struct device *dev) |
1da177e4 | 177 | { |
9657d75c DT |
178 | struct evdev *evdev = container_of(dev, struct evdev, dev); |
179 | ||
a7097ff8 | 180 | input_put_device(evdev->handle.dev); |
1da177e4 LT |
181 | kfree(evdev); |
182 | } | |
183 | ||
6addb1d6 DT |
184 | /* |
185 | * Grabs an event device (along with underlying input device). | |
186 | * This function is called with evdev->mutex taken. | |
187 | */ | |
188 | static int evdev_grab(struct evdev *evdev, struct evdev_client *client) | |
189 | { | |
190 | int error; | |
191 | ||
192 | if (evdev->grab) | |
193 | return -EBUSY; | |
194 | ||
195 | error = input_grab_device(&evdev->handle); | |
196 | if (error) | |
197 | return error; | |
198 | ||
199 | rcu_assign_pointer(evdev->grab, client); | |
6addb1d6 DT |
200 | |
201 | return 0; | |
202 | } | |
203 | ||
204 | static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client) | |
205 | { | |
dba42580 DT |
206 | struct evdev_client *grab = rcu_dereference_protected(evdev->grab, |
207 | lockdep_is_held(&evdev->mutex)); | |
208 | ||
209 | if (grab != client) | |
6addb1d6 DT |
210 | return -EINVAL; |
211 | ||
212 | rcu_assign_pointer(evdev->grab, NULL); | |
82ba56c2 | 213 | synchronize_rcu(); |
6addb1d6 DT |
214 | input_release_device(&evdev->handle); |
215 | ||
216 | return 0; | |
217 | } | |
218 | ||
219 | static void evdev_attach_client(struct evdev *evdev, | |
220 | struct evdev_client *client) | |
221 | { | |
222 | spin_lock(&evdev->client_lock); | |
223 | list_add_tail_rcu(&client->node, &evdev->client_list); | |
224 | spin_unlock(&evdev->client_lock); | |
6addb1d6 DT |
225 | } |
226 | ||
227 | static void evdev_detach_client(struct evdev *evdev, | |
228 | struct evdev_client *client) | |
229 | { | |
230 | spin_lock(&evdev->client_lock); | |
231 | list_del_rcu(&client->node); | |
232 | spin_unlock(&evdev->client_lock); | |
82ba56c2 | 233 | synchronize_rcu(); |
6addb1d6 DT |
234 | } |
235 | ||
236 | static int evdev_open_device(struct evdev *evdev) | |
237 | { | |
238 | int retval; | |
239 | ||
240 | retval = mutex_lock_interruptible(&evdev->mutex); | |
241 | if (retval) | |
242 | return retval; | |
243 | ||
244 | if (!evdev->exist) | |
245 | retval = -ENODEV; | |
06445014 | 246 | else if (!evdev->open++) { |
6addb1d6 | 247 | retval = input_open_device(&evdev->handle); |
06445014 ON |
248 | if (retval) |
249 | evdev->open--; | |
250 | } | |
6addb1d6 DT |
251 | |
252 | mutex_unlock(&evdev->mutex); | |
253 | return retval; | |
254 | } | |
255 | ||
256 | static void evdev_close_device(struct evdev *evdev) | |
257 | { | |
258 | mutex_lock(&evdev->mutex); | |
259 | ||
260 | if (evdev->exist && !--evdev->open) | |
261 | input_close_device(&evdev->handle); | |
262 | ||
263 | mutex_unlock(&evdev->mutex); | |
264 | } | |
265 | ||
266 | /* | |
267 | * Wake up users waiting for IO so they can disconnect from | |
268 | * dead device. | |
269 | */ | |
270 | static void evdev_hangup(struct evdev *evdev) | |
271 | { | |
272 | struct evdev_client *client; | |
273 | ||
274 | spin_lock(&evdev->client_lock); | |
275 | list_for_each_entry(client, &evdev->client_list, node) | |
276 | kill_fasync(&client->fasync, SIGIO, POLL_HUP); | |
277 | spin_unlock(&evdev->client_lock); | |
278 | ||
279 | wake_up_interruptible(&evdev->wait); | |
280 | } | |
281 | ||
d0ffb9be | 282 | static int evdev_release(struct inode *inode, struct file *file) |
1da177e4 | 283 | { |
d0ffb9be DT |
284 | struct evdev_client *client = file->private_data; |
285 | struct evdev *evdev = client->evdev; | |
1da177e4 | 286 | |
6addb1d6 | 287 | mutex_lock(&evdev->mutex); |
dba42580 | 288 | evdev_ungrab(evdev, client); |
6addb1d6 | 289 | mutex_unlock(&evdev->mutex); |
1da177e4 | 290 | |
6addb1d6 | 291 | evdev_detach_client(evdev, client); |
d0ffb9be | 292 | kfree(client); |
1da177e4 | 293 | |
6addb1d6 | 294 | evdev_close_device(evdev); |
1da177e4 | 295 | |
1da177e4 LT |
296 | return 0; |
297 | } | |
298 | ||
b58f7086 HR |
299 | static unsigned int evdev_compute_buffer_size(struct input_dev *dev) |
300 | { | |
63a6404d HR |
301 | unsigned int n_events = |
302 | max(dev->hint_events_per_packet * EVDEV_BUF_PACKETS, | |
303 | EVDEV_MIN_BUFFER_SIZE); | |
304 | ||
305 | return roundup_pow_of_two(n_events); | |
b58f7086 HR |
306 | } |
307 | ||
d0ffb9be | 308 | static int evdev_open(struct inode *inode, struct file *file) |
1da177e4 | 309 | { |
7f8d4cad DT |
310 | struct evdev *evdev = container_of(inode->i_cdev, struct evdev, cdev); |
311 | unsigned int bufsize = evdev_compute_buffer_size(evdev->handle.dev); | |
6addb1d6 | 312 | struct evdev_client *client; |
d542ed82 | 313 | int error; |
1da177e4 | 314 | |
b58f7086 HR |
315 | client = kzalloc(sizeof(struct evdev_client) + |
316 | bufsize * sizeof(struct input_event), | |
317 | GFP_KERNEL); | |
7f8d4cad DT |
318 | if (!client) |
319 | return -ENOMEM; | |
1da177e4 | 320 | |
b58f7086 | 321 | client->bufsize = bufsize; |
6addb1d6 | 322 | spin_lock_init(&client->buffer_lock); |
d0ffb9be | 323 | client->evdev = evdev; |
6addb1d6 | 324 | evdev_attach_client(evdev, client); |
1da177e4 | 325 | |
6addb1d6 DT |
326 | error = evdev_open_device(evdev); |
327 | if (error) | |
328 | goto err_free_client; | |
1da177e4 | 329 | |
d0ffb9be | 330 | file->private_data = client; |
3d7bbd45 DT |
331 | nonseekable_open(inode, file); |
332 | ||
1da177e4 | 333 | return 0; |
9657d75c DT |
334 | |
335 | err_free_client: | |
6addb1d6 | 336 | evdev_detach_client(evdev, client); |
9657d75c | 337 | kfree(client); |
9657d75c | 338 | return error; |
1da177e4 LT |
339 | } |
340 | ||
6addb1d6 DT |
341 | static ssize_t evdev_write(struct file *file, const char __user *buffer, |
342 | size_t count, loff_t *ppos) | |
3a51f7c4 | 343 | { |
d0ffb9be DT |
344 | struct evdev_client *client = file->private_data; |
345 | struct evdev *evdev = client->evdev; | |
3a51f7c4 | 346 | struct input_event event; |
02dfc496 | 347 | int retval = 0; |
52658bb6 | 348 | |
2872a9b5 | 349 | if (count != 0 && count < input_event_size()) |
439581ec PK |
350 | return -EINVAL; |
351 | ||
6addb1d6 DT |
352 | retval = mutex_lock_interruptible(&evdev->mutex); |
353 | if (retval) | |
354 | return retval; | |
355 | ||
356 | if (!evdev->exist) { | |
357 | retval = -ENODEV; | |
358 | goto out; | |
359 | } | |
52658bb6 | 360 | |
2872a9b5 DT |
361 | while (retval + input_event_size() <= count) { |
362 | ||
2d56f3a3 | 363 | if (input_event_from_user(buffer + retval, &event)) { |
6addb1d6 DT |
364 | retval = -EFAULT; |
365 | goto out; | |
366 | } | |
439581ec | 367 | retval += input_event_size(); |
6addb1d6 DT |
368 | |
369 | input_inject_event(&evdev->handle, | |
370 | event.type, event.code, event.value); | |
2872a9b5 | 371 | } |
52658bb6 | 372 | |
6addb1d6 DT |
373 | out: |
374 | mutex_unlock(&evdev->mutex); | |
52658bb6 JK |
375 | return retval; |
376 | } | |
52658bb6 | 377 | |
6addb1d6 DT |
378 | static int evdev_fetch_next_event(struct evdev_client *client, |
379 | struct input_event *event) | |
380 | { | |
381 | int have_event; | |
382 | ||
383 | spin_lock_irq(&client->buffer_lock); | |
384 | ||
566cf5b6 | 385 | have_event = client->packet_head != client->tail; |
6addb1d6 DT |
386 | if (have_event) { |
387 | *event = client->buffer[client->tail++]; | |
b58f7086 | 388 | client->tail &= client->bufsize - 1; |
6addb1d6 DT |
389 | } |
390 | ||
391 | spin_unlock_irq(&client->buffer_lock); | |
392 | ||
393 | return have_event; | |
394 | } | |
395 | ||
396 | static ssize_t evdev_read(struct file *file, char __user *buffer, | |
397 | size_t count, loff_t *ppos) | |
1da177e4 | 398 | { |
d0ffb9be DT |
399 | struct evdev_client *client = file->private_data; |
400 | struct evdev *evdev = client->evdev; | |
6addb1d6 | 401 | struct input_event event; |
2872a9b5 DT |
402 | size_t read = 0; |
403 | int error; | |
1da177e4 | 404 | |
2872a9b5 | 405 | if (count != 0 && count < input_event_size()) |
1da177e4 LT |
406 | return -EINVAL; |
407 | ||
2872a9b5 DT |
408 | for (;;) { |
409 | if (!evdev->exist) | |
410 | return -ENODEV; | |
1da177e4 | 411 | |
2872a9b5 DT |
412 | if (client->packet_head == client->tail && |
413 | (file->f_flags & O_NONBLOCK)) | |
414 | return -EAGAIN; | |
415 | ||
416 | /* | |
417 | * count == 0 is special - no IO is done but we check | |
418 | * for error conditions (see above). | |
419 | */ | |
420 | if (count == 0) | |
421 | break; | |
1da177e4 | 422 | |
2872a9b5 DT |
423 | while (read + input_event_size() <= count && |
424 | evdev_fetch_next_event(client, &event)) { | |
3a51f7c4 | 425 | |
2872a9b5 DT |
426 | if (input_event_to_user(buffer + read, &event)) |
427 | return -EFAULT; | |
3a51f7c4 | 428 | |
2872a9b5 DT |
429 | read += input_event_size(); |
430 | } | |
1da177e4 | 431 | |
2872a9b5 DT |
432 | if (read) |
433 | break; | |
e90f869c | 434 | |
2872a9b5 DT |
435 | if (!(file->f_flags & O_NONBLOCK)) { |
436 | error = wait_event_interruptible(evdev->wait, | |
437 | client->packet_head != client->tail || | |
438 | !evdev->exist); | |
439 | if (error) | |
440 | return error; | |
441 | } | |
442 | } | |
443 | ||
444 | return read; | |
1da177e4 LT |
445 | } |
446 | ||
447 | /* No kernel lock - fine */ | |
448 | static unsigned int evdev_poll(struct file *file, poll_table *wait) | |
449 | { | |
d0ffb9be DT |
450 | struct evdev_client *client = file->private_data; |
451 | struct evdev *evdev = client->evdev; | |
c18fb139 | 452 | unsigned int mask; |
1e0afb28 | 453 | |
d0ffb9be | 454 | poll_wait(file, &evdev->wait, wait); |
c18fb139 DT |
455 | |
456 | mask = evdev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR; | |
cdda911c | 457 | if (client->packet_head != client->tail) |
c18fb139 DT |
458 | mask |= POLLIN | POLLRDNORM; |
459 | ||
460 | return mask; | |
1da177e4 LT |
461 | } |
462 | ||
3a51f7c4 DT |
463 | #ifdef CONFIG_COMPAT |
464 | ||
465 | #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) | |
7b19ada2 | 466 | #define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1) |
3a51f7c4 DT |
467 | |
468 | #ifdef __BIG_ENDIAN | |
469 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
470 | unsigned int maxlen, void __user *p, int compat) | |
471 | { | |
472 | int len, i; | |
473 | ||
474 | if (compat) { | |
7b19ada2 | 475 | len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t); |
bf61f8d3 | 476 | if (len > maxlen) |
3a51f7c4 DT |
477 | len = maxlen; |
478 | ||
479 | for (i = 0; i < len / sizeof(compat_long_t); i++) | |
480 | if (copy_to_user((compat_long_t __user *) p + i, | |
481 | (compat_long_t *) bits + | |
482 | i + 1 - ((i % 2) << 1), | |
483 | sizeof(compat_long_t))) | |
484 | return -EFAULT; | |
485 | } else { | |
7b19ada2 | 486 | len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
487 | if (len > maxlen) |
488 | len = maxlen; | |
489 | ||
490 | if (copy_to_user(p, bits, len)) | |
491 | return -EFAULT; | |
492 | } | |
493 | ||
494 | return len; | |
495 | } | |
496 | #else | |
497 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
498 | unsigned int maxlen, void __user *p, int compat) | |
499 | { | |
500 | int len = compat ? | |
7b19ada2 JS |
501 | BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) : |
502 | BITS_TO_LONGS(maxbit) * sizeof(long); | |
3a51f7c4 DT |
503 | |
504 | if (len > maxlen) | |
505 | len = maxlen; | |
506 | ||
507 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
508 | } | |
509 | #endif /* __BIG_ENDIAN */ | |
510 | ||
511 | #else | |
512 | ||
513 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
514 | unsigned int maxlen, void __user *p, int compat) | |
515 | { | |
7b19ada2 | 516 | int len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
517 | |
518 | if (len > maxlen) | |
519 | len = maxlen; | |
520 | ||
521 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
522 | } | |
523 | ||
524 | #endif /* CONFIG_COMPAT */ | |
525 | ||
526 | static int str_to_user(const char *str, unsigned int maxlen, void __user *p) | |
527 | { | |
528 | int len; | |
529 | ||
530 | if (!str) | |
531 | return -ENOENT; | |
532 | ||
533 | len = strlen(str) + 1; | |
534 | if (len > maxlen) | |
535 | len = maxlen; | |
536 | ||
537 | return copy_to_user(p, str, len) ? -EFAULT : len; | |
538 | } | |
539 | ||
f2afa771 | 540 | #define OLD_KEY_MAX 0x1ff |
448cd166 DT |
541 | static int handle_eviocgbit(struct input_dev *dev, |
542 | unsigned int type, unsigned int size, | |
543 | void __user *p, int compat_mode) | |
5402a734 | 544 | { |
f2afa771 | 545 | static unsigned long keymax_warn_time; |
5402a734 LT |
546 | unsigned long *bits; |
547 | int len; | |
548 | ||
448cd166 | 549 | switch (type) { |
5402a734 LT |
550 | |
551 | case 0: bits = dev->evbit; len = EV_MAX; break; | |
552 | case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; | |
553 | case EV_REL: bits = dev->relbit; len = REL_MAX; break; | |
554 | case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; | |
555 | case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; | |
556 | case EV_LED: bits = dev->ledbit; len = LED_MAX; break; | |
557 | case EV_SND: bits = dev->sndbit; len = SND_MAX; break; | |
558 | case EV_FF: bits = dev->ffbit; len = FF_MAX; break; | |
559 | case EV_SW: bits = dev->swbit; len = SW_MAX; break; | |
560 | default: return -EINVAL; | |
561 | } | |
f2afa771 DT |
562 | |
563 | /* | |
564 | * Work around bugs in userspace programs that like to do | |
565 | * EVIOCGBIT(EV_KEY, KEY_MAX) and not realize that 'len' | |
566 | * should be in bytes, not in bits. | |
567 | */ | |
448cd166 | 568 | if (type == EV_KEY && size == OLD_KEY_MAX) { |
f2afa771 DT |
569 | len = OLD_KEY_MAX; |
570 | if (printk_timed_ratelimit(&keymax_warn_time, 10 * 1000)) | |
da0c4901 JP |
571 | pr_warning("(EVIOCGBIT): Suspicious buffer size %u, " |
572 | "limiting output to %zu bytes. See " | |
573 | "http://userweb.kernel.org/~dtor/eviocgbit-bug.html\n", | |
574 | OLD_KEY_MAX, | |
575 | BITS_TO_LONGS(OLD_KEY_MAX) * sizeof(long)); | |
f2afa771 DT |
576 | } |
577 | ||
448cd166 | 578 | return bits_to_user(bits, len, size, p, compat_mode); |
5402a734 | 579 | } |
f2afa771 | 580 | #undef OLD_KEY_MAX |
5402a734 | 581 | |
ab4e0192 | 582 | static int evdev_handle_get_keycode(struct input_dev *dev, void __user *p) |
8613e4c2 | 583 | { |
ab4e0192 DT |
584 | struct input_keymap_entry ke = { |
585 | .len = sizeof(unsigned int), | |
586 | .flags = 0, | |
587 | }; | |
588 | int __user *ip = (int __user *)p; | |
8613e4c2 MCC |
589 | int error; |
590 | ||
ab4e0192 DT |
591 | /* legacy case */ |
592 | if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) | |
593 | return -EFAULT; | |
8613e4c2 | 594 | |
ab4e0192 DT |
595 | error = input_get_keycode(dev, &ke); |
596 | if (error) | |
597 | return error; | |
8613e4c2 | 598 | |
ab4e0192 DT |
599 | if (put_user(ke.keycode, ip + 1)) |
600 | return -EFAULT; | |
8613e4c2 | 601 | |
ab4e0192 DT |
602 | return 0; |
603 | } | |
8613e4c2 | 604 | |
ab4e0192 DT |
605 | static int evdev_handle_get_keycode_v2(struct input_dev *dev, void __user *p) |
606 | { | |
607 | struct input_keymap_entry ke; | |
608 | int error; | |
8613e4c2 | 609 | |
ab4e0192 DT |
610 | if (copy_from_user(&ke, p, sizeof(ke))) |
611 | return -EFAULT; | |
8613e4c2 | 612 | |
ab4e0192 DT |
613 | error = input_get_keycode(dev, &ke); |
614 | if (error) | |
615 | return error; | |
8613e4c2 | 616 | |
ab4e0192 DT |
617 | if (copy_to_user(p, &ke, sizeof(ke))) |
618 | return -EFAULT; | |
8613e4c2 | 619 | |
8613e4c2 MCC |
620 | return 0; |
621 | } | |
622 | ||
ab4e0192 | 623 | static int evdev_handle_set_keycode(struct input_dev *dev, void __user *p) |
8613e4c2 | 624 | { |
ab4e0192 DT |
625 | struct input_keymap_entry ke = { |
626 | .len = sizeof(unsigned int), | |
627 | .flags = 0, | |
628 | }; | |
629 | int __user *ip = (int __user *)p; | |
8613e4c2 | 630 | |
ab4e0192 DT |
631 | if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) |
632 | return -EFAULT; | |
8613e4c2 | 633 | |
ab4e0192 DT |
634 | if (get_user(ke.keycode, ip + 1)) |
635 | return -EFAULT; | |
8613e4c2 | 636 | |
ab4e0192 DT |
637 | return input_set_keycode(dev, &ke); |
638 | } | |
8613e4c2 | 639 | |
ab4e0192 DT |
640 | static int evdev_handle_set_keycode_v2(struct input_dev *dev, void __user *p) |
641 | { | |
642 | struct input_keymap_entry ke; | |
8613e4c2 | 643 | |
ab4e0192 DT |
644 | if (copy_from_user(&ke, p, sizeof(ke))) |
645 | return -EFAULT; | |
8613e4c2 | 646 | |
ab4e0192 DT |
647 | if (ke.len > sizeof(ke.scancode)) |
648 | return -EINVAL; | |
8613e4c2 MCC |
649 | |
650 | return input_set_keycode(dev, &ke); | |
651 | } | |
652 | ||
1cf0c6e6 HR |
653 | static int evdev_handle_mt_request(struct input_dev *dev, |
654 | unsigned int size, | |
655 | int __user *ip) | |
656 | { | |
8d18fba2 | 657 | const struct input_mt *mt = dev->mt; |
1cf0c6e6 HR |
658 | unsigned int code; |
659 | int max_slots; | |
660 | int i; | |
661 | ||
662 | if (get_user(code, &ip[0])) | |
663 | return -EFAULT; | |
8d18fba2 | 664 | if (!mt || !input_is_mt_value(code)) |
1cf0c6e6 HR |
665 | return -EINVAL; |
666 | ||
667 | max_slots = (size - sizeof(__u32)) / sizeof(__s32); | |
8d18fba2 HR |
668 | for (i = 0; i < mt->num_slots && i < max_slots; i++) { |
669 | int value = input_mt_get_value(&mt->slots[i], code); | |
670 | if (put_user(value, &ip[1 + i])) | |
1cf0c6e6 | 671 | return -EFAULT; |
8d18fba2 | 672 | } |
1cf0c6e6 HR |
673 | |
674 | return 0; | |
675 | } | |
676 | ||
6addb1d6 DT |
677 | static long evdev_do_ioctl(struct file *file, unsigned int cmd, |
678 | void __user *p, int compat_mode) | |
1da177e4 | 679 | { |
d0ffb9be DT |
680 | struct evdev_client *client = file->private_data; |
681 | struct evdev *evdev = client->evdev; | |
1da177e4 LT |
682 | struct input_dev *dev = evdev->handle.dev; |
683 | struct input_absinfo abs; | |
509ca1a9 | 684 | struct ff_effect effect; |
3a51f7c4 | 685 | int __user *ip = (int __user *)p; |
58b93995 | 686 | unsigned int i, t, u, v; |
448cd166 | 687 | unsigned int size; |
509ca1a9 | 688 | int error; |
1da177e4 | 689 | |
448cd166 | 690 | /* First we check for fixed-length commands */ |
1da177e4 LT |
691 | switch (cmd) { |
692 | ||
6addb1d6 DT |
693 | case EVIOCGVERSION: |
694 | return put_user(EV_VERSION, ip); | |
1da177e4 | 695 | |
6addb1d6 DT |
696 | case EVIOCGID: |
697 | if (copy_to_user(p, &dev->id, sizeof(struct input_id))) | |
698 | return -EFAULT; | |
699 | return 0; | |
08791e5c | 700 | |
6addb1d6 DT |
701 | case EVIOCGREP: |
702 | if (!test_bit(EV_REP, dev->evbit)) | |
703 | return -ENOSYS; | |
704 | if (put_user(dev->rep[REP_DELAY], ip)) | |
705 | return -EFAULT; | |
706 | if (put_user(dev->rep[REP_PERIOD], ip + 1)) | |
707 | return -EFAULT; | |
708 | return 0; | |
08791e5c | 709 | |
6addb1d6 DT |
710 | case EVIOCSREP: |
711 | if (!test_bit(EV_REP, dev->evbit)) | |
712 | return -ENOSYS; | |
713 | if (get_user(u, ip)) | |
714 | return -EFAULT; | |
715 | if (get_user(v, ip + 1)) | |
716 | return -EFAULT; | |
08791e5c | 717 | |
6addb1d6 DT |
718 | input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u); |
719 | input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v); | |
3a51f7c4 | 720 | |
6addb1d6 | 721 | return 0; |
1da177e4 | 722 | |
6addb1d6 DT |
723 | case EVIOCRMFF: |
724 | return input_ff_erase(dev, (int)(unsigned long) p, file); | |
1da177e4 | 725 | |
6addb1d6 DT |
726 | case EVIOCGEFFECTS: |
727 | i = test_bit(EV_FF, dev->evbit) ? | |
728 | dev->ff->max_effects : 0; | |
729 | if (put_user(i, ip)) | |
730 | return -EFAULT; | |
731 | return 0; | |
732 | ||
733 | case EVIOCGRAB: | |
734 | if (p) | |
735 | return evdev_grab(evdev, client); | |
736 | else | |
737 | return evdev_ungrab(evdev, client); | |
ab4e0192 | 738 | |
a80b83b7 JS |
739 | case EVIOCSCLOCKID: |
740 | if (copy_from_user(&i, p, sizeof(unsigned int))) | |
741 | return -EFAULT; | |
742 | if (i != CLOCK_MONOTONIC && i != CLOCK_REALTIME) | |
743 | return -EINVAL; | |
744 | client->clkid = i; | |
745 | return 0; | |
746 | ||
ab4e0192 DT |
747 | case EVIOCGKEYCODE: |
748 | return evdev_handle_get_keycode(dev, p); | |
749 | ||
750 | case EVIOCSKEYCODE: | |
751 | return evdev_handle_set_keycode(dev, p); | |
752 | ||
753 | case EVIOCGKEYCODE_V2: | |
754 | return evdev_handle_get_keycode_v2(dev, p); | |
755 | ||
756 | case EVIOCSKEYCODE_V2: | |
757 | return evdev_handle_set_keycode_v2(dev, p); | |
448cd166 | 758 | } |
1da177e4 | 759 | |
448cd166 | 760 | size = _IOC_SIZE(cmd); |
1da177e4 | 761 | |
448cd166 DT |
762 | /* Now check variable-length commands */ |
763 | #define EVIOC_MASK_SIZE(nr) ((nr) & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) | |
448cd166 | 764 | switch (EVIOC_MASK_SIZE(cmd)) { |
41e979f8 | 765 | |
85b77200 HR |
766 | case EVIOCGPROP(0): |
767 | return bits_to_user(dev->propbit, INPUT_PROP_MAX, | |
768 | size, p, compat_mode); | |
769 | ||
1cf0c6e6 HR |
770 | case EVIOCGMTSLOTS(0): |
771 | return evdev_handle_mt_request(dev, size, ip); | |
772 | ||
448cd166 DT |
773 | case EVIOCGKEY(0): |
774 | return bits_to_user(dev->key, KEY_MAX, size, p, compat_mode); | |
1da177e4 | 775 | |
448cd166 DT |
776 | case EVIOCGLED(0): |
777 | return bits_to_user(dev->led, LED_MAX, size, p, compat_mode); | |
1da177e4 | 778 | |
448cd166 DT |
779 | case EVIOCGSND(0): |
780 | return bits_to_user(dev->snd, SND_MAX, size, p, compat_mode); | |
1da177e4 | 781 | |
448cd166 DT |
782 | case EVIOCGSW(0): |
783 | return bits_to_user(dev->sw, SW_MAX, size, p, compat_mode); | |
31581066 | 784 | |
448cd166 DT |
785 | case EVIOCGNAME(0): |
786 | return str_to_user(dev->name, size, p); | |
1da177e4 | 787 | |
448cd166 DT |
788 | case EVIOCGPHYS(0): |
789 | return str_to_user(dev->phys, size, p); | |
1da177e4 | 790 | |
448cd166 DT |
791 | case EVIOCGUNIQ(0): |
792 | return str_to_user(dev->uniq, size, p); | |
1da177e4 | 793 | |
448cd166 DT |
794 | case EVIOC_MASK_SIZE(EVIOCSFF): |
795 | if (input_ff_effect_from_user(p, size, &effect)) | |
796 | return -EFAULT; | |
1da177e4 | 797 | |
448cd166 | 798 | error = input_ff_upload(dev, &effect, file); |
1da177e4 | 799 | |
448cd166 DT |
800 | if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) |
801 | return -EFAULT; | |
41e979f8 | 802 | |
448cd166 DT |
803 | return error; |
804 | } | |
1da177e4 | 805 | |
448cd166 DT |
806 | /* Multi-number variable-length handlers */ |
807 | if (_IOC_TYPE(cmd) != 'E') | |
808 | return -EINVAL; | |
1da177e4 | 809 | |
448cd166 | 810 | if (_IOC_DIR(cmd) == _IOC_READ) { |
6addb1d6 | 811 | |
448cd166 DT |
812 | if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0))) |
813 | return handle_eviocgbit(dev, | |
814 | _IOC_NR(cmd) & EV_MAX, size, | |
815 | p, compat_mode); | |
1da177e4 | 816 | |
448cd166 | 817 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { |
f2278f31 | 818 | |
0a74a1df DM |
819 | if (!dev->absinfo) |
820 | return -EINVAL; | |
821 | ||
448cd166 DT |
822 | t = _IOC_NR(cmd) & ABS_MAX; |
823 | abs = dev->absinfo[t]; | |
f2278f31 | 824 | |
448cd166 DT |
825 | if (copy_to_user(p, &abs, min_t(size_t, |
826 | size, sizeof(struct input_absinfo)))) | |
827 | return -EFAULT; | |
f2278f31 | 828 | |
448cd166 DT |
829 | return 0; |
830 | } | |
831 | } | |
f2278f31 | 832 | |
f9ce6eb5 | 833 | if (_IOC_DIR(cmd) == _IOC_WRITE) { |
f2278f31 | 834 | |
448cd166 | 835 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { |
1da177e4 | 836 | |
0a74a1df DM |
837 | if (!dev->absinfo) |
838 | return -EINVAL; | |
839 | ||
448cd166 | 840 | t = _IOC_NR(cmd) & ABS_MAX; |
41e979f8 | 841 | |
448cd166 DT |
842 | if (copy_from_user(&abs, p, min_t(size_t, |
843 | size, sizeof(struct input_absinfo)))) | |
844 | return -EFAULT; | |
1da177e4 | 845 | |
448cd166 DT |
846 | if (size < sizeof(struct input_absinfo)) |
847 | abs.resolution = 0; | |
d31b2865 | 848 | |
448cd166 DT |
849 | /* We can't change number of reserved MT slots */ |
850 | if (t == ABS_MT_SLOT) | |
851 | return -EINVAL; | |
40d007e7 | 852 | |
448cd166 DT |
853 | /* |
854 | * Take event lock to ensure that we are not | |
855 | * changing device parameters in the middle | |
856 | * of event. | |
857 | */ | |
858 | spin_lock_irq(&dev->event_lock); | |
859 | dev->absinfo[t] = abs; | |
860 | spin_unlock_irq(&dev->event_lock); | |
6addb1d6 | 861 | |
448cd166 | 862 | return 0; |
6addb1d6 | 863 | } |
1da177e4 | 864 | } |
448cd166 | 865 | |
1da177e4 LT |
866 | return -EINVAL; |
867 | } | |
1da177e4 | 868 | |
6addb1d6 DT |
869 | static long evdev_ioctl_handler(struct file *file, unsigned int cmd, |
870 | void __user *p, int compat_mode) | |
871 | { | |
872 | struct evdev_client *client = file->private_data; | |
873 | struct evdev *evdev = client->evdev; | |
874 | int retval; | |
875 | ||
876 | retval = mutex_lock_interruptible(&evdev->mutex); | |
877 | if (retval) | |
878 | return retval; | |
879 | ||
880 | if (!evdev->exist) { | |
881 | retval = -ENODEV; | |
882 | goto out; | |
883 | } | |
884 | ||
885 | retval = evdev_do_ioctl(file, cmd, p, compat_mode); | |
886 | ||
887 | out: | |
888 | mutex_unlock(&evdev->mutex); | |
889 | return retval; | |
890 | } | |
891 | ||
3a51f7c4 DT |
892 | static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
893 | { | |
894 | return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0); | |
895 | } | |
41e979f8 | 896 | |
3a51f7c4 | 897 | #ifdef CONFIG_COMPAT |
6addb1d6 DT |
898 | static long evdev_ioctl_compat(struct file *file, |
899 | unsigned int cmd, unsigned long arg) | |
52658bb6 | 900 | { |
3a51f7c4 | 901 | return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1); |
1da177e4 | 902 | } |
52658bb6 | 903 | #endif |
1da177e4 | 904 | |
66e66118 | 905 | static const struct file_operations evdev_fops = { |
6addb1d6 DT |
906 | .owner = THIS_MODULE, |
907 | .read = evdev_read, | |
908 | .write = evdev_write, | |
909 | .poll = evdev_poll, | |
910 | .open = evdev_open, | |
911 | .release = evdev_release, | |
912 | .unlocked_ioctl = evdev_ioctl, | |
52658bb6 | 913 | #ifdef CONFIG_COMPAT |
6addb1d6 | 914 | .compat_ioctl = evdev_ioctl_compat, |
52658bb6 | 915 | #endif |
6addb1d6 | 916 | .fasync = evdev_fasync, |
6038f373 AB |
917 | .flush = evdev_flush, |
918 | .llseek = no_llseek, | |
1da177e4 LT |
919 | }; |
920 | ||
6addb1d6 DT |
921 | /* |
922 | * Mark device non-existent. This disables writes, ioctls and | |
923 | * prevents new users from opening the device. Already posted | |
924 | * blocking reads will stay, however new ones will fail. | |
925 | */ | |
926 | static void evdev_mark_dead(struct evdev *evdev) | |
927 | { | |
928 | mutex_lock(&evdev->mutex); | |
20da92de | 929 | evdev->exist = false; |
6addb1d6 DT |
930 | mutex_unlock(&evdev->mutex); |
931 | } | |
932 | ||
933 | static void evdev_cleanup(struct evdev *evdev) | |
934 | { | |
935 | struct input_handle *handle = &evdev->handle; | |
936 | ||
937 | evdev_mark_dead(evdev); | |
938 | evdev_hangup(evdev); | |
7f8d4cad DT |
939 | |
940 | cdev_del(&evdev->cdev); | |
6addb1d6 DT |
941 | |
942 | /* evdev is marked dead so no one else accesses evdev->open */ | |
943 | if (evdev->open) { | |
944 | input_flush_device(handle, NULL); | |
945 | input_close_device(handle); | |
946 | } | |
947 | } | |
948 | ||
949 | /* | |
950 | * Create new evdev device. Note that input core serializes calls | |
7f8d4cad | 951 | * to connect and disconnect. |
6addb1d6 | 952 | */ |
5b2a0826 DT |
953 | static int evdev_connect(struct input_handler *handler, struct input_dev *dev, |
954 | const struct input_device_id *id) | |
1da177e4 LT |
955 | { |
956 | struct evdev *evdev; | |
957 | int minor; | |
7f8d4cad | 958 | int dev_no; |
5b2a0826 | 959 | int error; |
1da177e4 | 960 | |
7f8d4cad DT |
961 | minor = input_get_new_minor(EVDEV_MINOR_BASE, EVDEV_MINORS, true); |
962 | if (minor < 0) { | |
963 | error = minor; | |
964 | pr_err("failed to reserve new minor: %d\n", error); | |
965 | return error; | |
1da177e4 LT |
966 | } |
967 | ||
5b2a0826 | 968 | evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL); |
7f8d4cad DT |
969 | if (!evdev) { |
970 | error = -ENOMEM; | |
971 | goto err_free_minor; | |
972 | } | |
1da177e4 | 973 | |
d0ffb9be | 974 | INIT_LIST_HEAD(&evdev->client_list); |
6addb1d6 DT |
975 | spin_lock_init(&evdev->client_lock); |
976 | mutex_init(&evdev->mutex); | |
1da177e4 | 977 | init_waitqueue_head(&evdev->wait); |
20da92de | 978 | evdev->exist = true; |
7f8d4cad DT |
979 | |
980 | dev_no = minor; | |
981 | /* Normalize device number if it falls into legacy range */ | |
982 | if (dev_no < EVDEV_MINOR_BASE + EVDEV_MINORS) | |
983 | dev_no -= EVDEV_MINOR_BASE; | |
984 | dev_set_name(&evdev->dev, "event%d", dev_no); | |
6addb1d6 | 985 | |
a7097ff8 | 986 | evdev->handle.dev = input_get_device(dev); |
3d5cb60e | 987 | evdev->handle.name = dev_name(&evdev->dev); |
1da177e4 LT |
988 | evdev->handle.handler = handler; |
989 | evdev->handle.private = evdev; | |
1da177e4 | 990 | |
7f8d4cad | 991 | evdev->dev.devt = MKDEV(INPUT_MAJOR, minor); |
9657d75c DT |
992 | evdev->dev.class = &input_class; |
993 | evdev->dev.parent = &dev->dev; | |
9657d75c DT |
994 | evdev->dev.release = evdev_free; |
995 | device_initialize(&evdev->dev); | |
5b2a0826 | 996 | |
6addb1d6 | 997 | error = input_register_handle(&evdev->handle); |
5b2a0826 | 998 | if (error) |
9657d75c | 999 | goto err_free_evdev; |
5b2a0826 | 1000 | |
7f8d4cad | 1001 | cdev_init(&evdev->cdev, &evdev_fops); |
4a215aad | 1002 | evdev->cdev.kobj.parent = &evdev->dev.kobj; |
7f8d4cad | 1003 | error = cdev_add(&evdev->cdev, evdev->dev.devt, 1); |
6addb1d6 DT |
1004 | if (error) |
1005 | goto err_unregister_handle; | |
1006 | ||
1007 | error = device_add(&evdev->dev); | |
5b2a0826 | 1008 | if (error) |
6addb1d6 | 1009 | goto err_cleanup_evdev; |
1da177e4 | 1010 | |
5b2a0826 | 1011 | return 0; |
1da177e4 | 1012 | |
6addb1d6 DT |
1013 | err_cleanup_evdev: |
1014 | evdev_cleanup(evdev); | |
1015 | err_unregister_handle: | |
1016 | input_unregister_handle(&evdev->handle); | |
5b2a0826 | 1017 | err_free_evdev: |
9657d75c | 1018 | put_device(&evdev->dev); |
7f8d4cad DT |
1019 | err_free_minor: |
1020 | input_free_minor(minor); | |
5b2a0826 | 1021 | return error; |
1da177e4 LT |
1022 | } |
1023 | ||
1024 | static void evdev_disconnect(struct input_handle *handle) | |
1025 | { | |
1026 | struct evdev *evdev = handle->private; | |
1da177e4 | 1027 | |
9657d75c | 1028 | device_del(&evdev->dev); |
6addb1d6 | 1029 | evdev_cleanup(evdev); |
7f8d4cad | 1030 | input_free_minor(MINOR(evdev->dev.devt)); |
6addb1d6 | 1031 | input_unregister_handle(handle); |
9657d75c | 1032 | put_device(&evdev->dev); |
1da177e4 LT |
1033 | } |
1034 | ||
66e66118 | 1035 | static const struct input_device_id evdev_ids[] = { |
1da177e4 LT |
1036 | { .driver_info = 1 }, /* Matches all devices */ |
1037 | { }, /* Terminating zero entry */ | |
1038 | }; | |
1039 | ||
1040 | MODULE_DEVICE_TABLE(input, evdev_ids); | |
1041 | ||
1042 | static struct input_handler evdev_handler = { | |
6addb1d6 | 1043 | .event = evdev_event, |
a274ac15 | 1044 | .events = evdev_events, |
6addb1d6 DT |
1045 | .connect = evdev_connect, |
1046 | .disconnect = evdev_disconnect, | |
7f8d4cad | 1047 | .legacy_minors = true, |
6addb1d6 DT |
1048 | .minor = EVDEV_MINOR_BASE, |
1049 | .name = "evdev", | |
1050 | .id_table = evdev_ids, | |
1da177e4 LT |
1051 | }; |
1052 | ||
1053 | static int __init evdev_init(void) | |
1054 | { | |
4263cf0f | 1055 | return input_register_handler(&evdev_handler); |
1da177e4 LT |
1056 | } |
1057 | ||
1058 | static void __exit evdev_exit(void) | |
1059 | { | |
1060 | input_unregister_handler(&evdev_handler); | |
1061 | } | |
1062 | ||
1063 | module_init(evdev_init); | |
1064 | module_exit(evdev_exit); | |
1065 | ||
1066 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
1067 | MODULE_DESCRIPTION("Input driver event char devices"); | |
1068 | MODULE_LICENSE("GPL"); |