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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 | ||
48318028 DH |
55 | /* flush queued events of type @type, caller must hold client->buffer_lock */ |
56 | static void __evdev_flush_queue(struct evdev_client *client, unsigned int type) | |
57 | { | |
58 | unsigned int i, head, num; | |
59 | unsigned int mask = client->bufsize - 1; | |
60 | bool is_report; | |
61 | struct input_event *ev; | |
62 | ||
63 | BUG_ON(type == EV_SYN); | |
64 | ||
65 | head = client->tail; | |
66 | client->packet_head = client->tail; | |
67 | ||
68 | /* init to 1 so a leading SYN_REPORT will not be dropped */ | |
69 | num = 1; | |
70 | ||
71 | for (i = client->tail; i != client->head; i = (i + 1) & mask) { | |
72 | ev = &client->buffer[i]; | |
73 | is_report = ev->type == EV_SYN && ev->code == SYN_REPORT; | |
74 | ||
75 | if (ev->type == type) { | |
76 | /* drop matched entry */ | |
77 | continue; | |
78 | } else if (is_report && !num) { | |
79 | /* drop empty SYN_REPORT groups */ | |
80 | continue; | |
81 | } else if (head != i) { | |
82 | /* move entry to fill the gap */ | |
83 | client->buffer[head].time = ev->time; | |
84 | client->buffer[head].type = ev->type; | |
85 | client->buffer[head].code = ev->code; | |
86 | client->buffer[head].value = ev->value; | |
87 | } | |
88 | ||
89 | num++; | |
90 | head = (head + 1) & mask; | |
91 | ||
92 | if (is_report) { | |
93 | num = 0; | |
94 | client->packet_head = head; | |
95 | } | |
96 | } | |
97 | ||
98 | client->head = head; | |
99 | } | |
100 | ||
101 | /* queue SYN_DROPPED event */ | |
102 | static void evdev_queue_syn_dropped(struct evdev_client *client) | |
103 | { | |
104 | unsigned long flags; | |
105 | struct input_event ev; | |
106 | ktime_t time; | |
107 | ||
108 | time = ktime_get(); | |
109 | if (client->clkid != CLOCK_MONOTONIC) | |
110 | time = ktime_sub(time, ktime_get_monotonic_offset()); | |
111 | ||
112 | ev.time = ktime_to_timeval(time); | |
113 | ev.type = EV_SYN; | |
114 | ev.code = SYN_DROPPED; | |
115 | ev.value = 0; | |
116 | ||
117 | spin_lock_irqsave(&client->buffer_lock, flags); | |
118 | ||
119 | client->buffer[client->head++] = ev; | |
120 | client->head &= client->bufsize - 1; | |
121 | ||
122 | if (unlikely(client->head == client->tail)) { | |
123 | /* drop queue but keep our SYN_DROPPED event */ | |
124 | client->tail = (client->head - 1) & (client->bufsize - 1); | |
125 | client->packet_head = client->tail; | |
126 | } | |
127 | ||
128 | spin_unlock_irqrestore(&client->buffer_lock, flags); | |
129 | } | |
130 | ||
a274ac15 HR |
131 | static void __pass_event(struct evdev_client *client, |
132 | const struct input_event *event) | |
6addb1d6 | 133 | { |
9fb0f14e JB |
134 | client->buffer[client->head++] = *event; |
135 | client->head &= client->bufsize - 1; | |
136 | ||
137 | if (unlikely(client->head == client->tail)) { | |
138 | /* | |
139 | * This effectively "drops" all unconsumed events, leaving | |
140 | * EV_SYN/SYN_DROPPED plus the newest event in the queue. | |
141 | */ | |
142 | client->tail = (client->head - 2) & (client->bufsize - 1); | |
143 | ||
144 | client->buffer[client->tail].time = event->time; | |
145 | client->buffer[client->tail].type = EV_SYN; | |
146 | client->buffer[client->tail].code = SYN_DROPPED; | |
147 | client->buffer[client->tail].value = 0; | |
9fb0f14e | 148 | |
cdda911c JB |
149 | client->packet_head = client->tail; |
150 | } | |
6addb1d6 | 151 | |
cdda911c JB |
152 | if (event->type == EV_SYN && event->code == SYN_REPORT) { |
153 | client->packet_head = client->head; | |
30a589fd | 154 | kill_fasync(&client->fasync, SIGIO, POLL_IN); |
cdda911c | 155 | } |
a274ac15 HR |
156 | } |
157 | ||
158 | static void evdev_pass_values(struct evdev_client *client, | |
159 | const struct input_value *vals, unsigned int count, | |
160 | ktime_t mono, ktime_t real) | |
161 | { | |
162 | struct evdev *evdev = client->evdev; | |
163 | const struct input_value *v; | |
164 | struct input_event event; | |
165 | bool wakeup = false; | |
166 | ||
167 | event.time = ktime_to_timeval(client->clkid == CLOCK_MONOTONIC ? | |
168 | mono : real); | |
169 | ||
170 | /* Interrupts are disabled, just acquire the lock. */ | |
171 | spin_lock(&client->buffer_lock); | |
172 | ||
173 | for (v = vals; v != vals + count; v++) { | |
174 | event.type = v->type; | |
175 | event.code = v->code; | |
176 | event.value = v->value; | |
177 | __pass_event(client, &event); | |
178 | if (v->type == EV_SYN && v->code == SYN_REPORT) | |
179 | wakeup = true; | |
180 | } | |
cdda911c JB |
181 | |
182 | spin_unlock(&client->buffer_lock); | |
a274ac15 HR |
183 | |
184 | if (wakeup) | |
185 | wake_up_interruptible(&evdev->wait); | |
6addb1d6 DT |
186 | } |
187 | ||
188 | /* | |
a274ac15 | 189 | * Pass incoming events to all connected clients. |
6addb1d6 | 190 | */ |
a274ac15 HR |
191 | static void evdev_events(struct input_handle *handle, |
192 | const struct input_value *vals, unsigned int count) | |
1da177e4 LT |
193 | { |
194 | struct evdev *evdev = handle->private; | |
d0ffb9be | 195 | struct evdev_client *client; |
a80b83b7 JS |
196 | ktime_t time_mono, time_real; |
197 | ||
198 | time_mono = ktime_get(); | |
199 | time_real = ktime_sub(time_mono, ktime_get_monotonic_offset()); | |
1da177e4 | 200 | |
82ba56c2 DT |
201 | rcu_read_lock(); |
202 | ||
6addb1d6 | 203 | client = rcu_dereference(evdev->grab); |
a80b83b7 | 204 | |
6addb1d6 | 205 | if (client) |
a274ac15 | 206 | evdev_pass_values(client, vals, count, time_mono, time_real); |
6addb1d6 DT |
207 | else |
208 | list_for_each_entry_rcu(client, &evdev->client_list, node) | |
a274ac15 HR |
209 | evdev_pass_values(client, vals, count, |
210 | time_mono, time_real); | |
1da177e4 | 211 | |
82ba56c2 | 212 | rcu_read_unlock(); |
a274ac15 | 213 | } |
82ba56c2 | 214 | |
a274ac15 HR |
215 | /* |
216 | * Pass incoming event to all connected clients. | |
217 | */ | |
218 | static void evdev_event(struct input_handle *handle, | |
219 | unsigned int type, unsigned int code, int value) | |
220 | { | |
221 | struct input_value vals[] = { { type, code, value } }; | |
222 | ||
223 | evdev_events(handle, vals, 1); | |
1da177e4 LT |
224 | } |
225 | ||
226 | static int evdev_fasync(int fd, struct file *file, int on) | |
227 | { | |
d0ffb9be | 228 | struct evdev_client *client = file->private_data; |
1e0afb28 | 229 | |
60aa4924 | 230 | return fasync_helper(fd, file, on, &client->fasync); |
1da177e4 LT |
231 | } |
232 | ||
1e0afb28 | 233 | static int evdev_flush(struct file *file, fl_owner_t id) |
1da177e4 | 234 | { |
d0ffb9be DT |
235 | struct evdev_client *client = file->private_data; |
236 | struct evdev *evdev = client->evdev; | |
6addb1d6 DT |
237 | int retval; |
238 | ||
239 | retval = mutex_lock_interruptible(&evdev->mutex); | |
240 | if (retval) | |
241 | return retval; | |
1e0afb28 | 242 | |
d0ffb9be | 243 | if (!evdev->exist) |
6addb1d6 DT |
244 | retval = -ENODEV; |
245 | else | |
246 | retval = input_flush_device(&evdev->handle, file); | |
1e0afb28 | 247 | |
6addb1d6 DT |
248 | mutex_unlock(&evdev->mutex); |
249 | return retval; | |
1da177e4 LT |
250 | } |
251 | ||
9657d75c | 252 | static void evdev_free(struct device *dev) |
1da177e4 | 253 | { |
9657d75c DT |
254 | struct evdev *evdev = container_of(dev, struct evdev, dev); |
255 | ||
a7097ff8 | 256 | input_put_device(evdev->handle.dev); |
1da177e4 LT |
257 | kfree(evdev); |
258 | } | |
259 | ||
6addb1d6 DT |
260 | /* |
261 | * Grabs an event device (along with underlying input device). | |
262 | * This function is called with evdev->mutex taken. | |
263 | */ | |
264 | static int evdev_grab(struct evdev *evdev, struct evdev_client *client) | |
265 | { | |
266 | int error; | |
267 | ||
268 | if (evdev->grab) | |
269 | return -EBUSY; | |
270 | ||
271 | error = input_grab_device(&evdev->handle); | |
272 | if (error) | |
273 | return error; | |
274 | ||
275 | rcu_assign_pointer(evdev->grab, client); | |
6addb1d6 DT |
276 | |
277 | return 0; | |
278 | } | |
279 | ||
280 | static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client) | |
281 | { | |
dba42580 DT |
282 | struct evdev_client *grab = rcu_dereference_protected(evdev->grab, |
283 | lockdep_is_held(&evdev->mutex)); | |
284 | ||
285 | if (grab != client) | |
6addb1d6 DT |
286 | return -EINVAL; |
287 | ||
288 | rcu_assign_pointer(evdev->grab, NULL); | |
82ba56c2 | 289 | synchronize_rcu(); |
6addb1d6 DT |
290 | input_release_device(&evdev->handle); |
291 | ||
292 | return 0; | |
293 | } | |
294 | ||
295 | static void evdev_attach_client(struct evdev *evdev, | |
296 | struct evdev_client *client) | |
297 | { | |
298 | spin_lock(&evdev->client_lock); | |
299 | list_add_tail_rcu(&client->node, &evdev->client_list); | |
300 | spin_unlock(&evdev->client_lock); | |
6addb1d6 DT |
301 | } |
302 | ||
303 | static void evdev_detach_client(struct evdev *evdev, | |
304 | struct evdev_client *client) | |
305 | { | |
306 | spin_lock(&evdev->client_lock); | |
307 | list_del_rcu(&client->node); | |
308 | spin_unlock(&evdev->client_lock); | |
82ba56c2 | 309 | synchronize_rcu(); |
6addb1d6 DT |
310 | } |
311 | ||
312 | static int evdev_open_device(struct evdev *evdev) | |
313 | { | |
314 | int retval; | |
315 | ||
316 | retval = mutex_lock_interruptible(&evdev->mutex); | |
317 | if (retval) | |
318 | return retval; | |
319 | ||
320 | if (!evdev->exist) | |
321 | retval = -ENODEV; | |
06445014 | 322 | else if (!evdev->open++) { |
6addb1d6 | 323 | retval = input_open_device(&evdev->handle); |
06445014 ON |
324 | if (retval) |
325 | evdev->open--; | |
326 | } | |
6addb1d6 DT |
327 | |
328 | mutex_unlock(&evdev->mutex); | |
329 | return retval; | |
330 | } | |
331 | ||
332 | static void evdev_close_device(struct evdev *evdev) | |
333 | { | |
334 | mutex_lock(&evdev->mutex); | |
335 | ||
336 | if (evdev->exist && !--evdev->open) | |
337 | input_close_device(&evdev->handle); | |
338 | ||
339 | mutex_unlock(&evdev->mutex); | |
340 | } | |
341 | ||
342 | /* | |
343 | * Wake up users waiting for IO so they can disconnect from | |
344 | * dead device. | |
345 | */ | |
346 | static void evdev_hangup(struct evdev *evdev) | |
347 | { | |
348 | struct evdev_client *client; | |
349 | ||
350 | spin_lock(&evdev->client_lock); | |
351 | list_for_each_entry(client, &evdev->client_list, node) | |
352 | kill_fasync(&client->fasync, SIGIO, POLL_HUP); | |
353 | spin_unlock(&evdev->client_lock); | |
354 | ||
355 | wake_up_interruptible(&evdev->wait); | |
356 | } | |
357 | ||
d0ffb9be | 358 | static int evdev_release(struct inode *inode, struct file *file) |
1da177e4 | 359 | { |
d0ffb9be DT |
360 | struct evdev_client *client = file->private_data; |
361 | struct evdev *evdev = client->evdev; | |
1da177e4 | 362 | |
6addb1d6 | 363 | mutex_lock(&evdev->mutex); |
dba42580 | 364 | evdev_ungrab(evdev, client); |
6addb1d6 | 365 | mutex_unlock(&evdev->mutex); |
1da177e4 | 366 | |
6addb1d6 | 367 | evdev_detach_client(evdev, client); |
d0ffb9be | 368 | kfree(client); |
1da177e4 | 369 | |
6addb1d6 | 370 | evdev_close_device(evdev); |
1da177e4 | 371 | |
1da177e4 LT |
372 | return 0; |
373 | } | |
374 | ||
b58f7086 HR |
375 | static unsigned int evdev_compute_buffer_size(struct input_dev *dev) |
376 | { | |
63a6404d HR |
377 | unsigned int n_events = |
378 | max(dev->hint_events_per_packet * EVDEV_BUF_PACKETS, | |
379 | EVDEV_MIN_BUFFER_SIZE); | |
380 | ||
381 | return roundup_pow_of_two(n_events); | |
b58f7086 HR |
382 | } |
383 | ||
d0ffb9be | 384 | static int evdev_open(struct inode *inode, struct file *file) |
1da177e4 | 385 | { |
7f8d4cad DT |
386 | struct evdev *evdev = container_of(inode->i_cdev, struct evdev, cdev); |
387 | unsigned int bufsize = evdev_compute_buffer_size(evdev->handle.dev); | |
6addb1d6 | 388 | struct evdev_client *client; |
d542ed82 | 389 | int error; |
1da177e4 | 390 | |
b58f7086 HR |
391 | client = kzalloc(sizeof(struct evdev_client) + |
392 | bufsize * sizeof(struct input_event), | |
393 | GFP_KERNEL); | |
7f8d4cad DT |
394 | if (!client) |
395 | return -ENOMEM; | |
1da177e4 | 396 | |
b58f7086 | 397 | client->bufsize = bufsize; |
6addb1d6 | 398 | spin_lock_init(&client->buffer_lock); |
d0ffb9be | 399 | client->evdev = evdev; |
6addb1d6 | 400 | evdev_attach_client(evdev, client); |
1da177e4 | 401 | |
6addb1d6 DT |
402 | error = evdev_open_device(evdev); |
403 | if (error) | |
404 | goto err_free_client; | |
1da177e4 | 405 | |
d0ffb9be | 406 | file->private_data = client; |
3d7bbd45 DT |
407 | nonseekable_open(inode, file); |
408 | ||
1da177e4 | 409 | return 0; |
9657d75c DT |
410 | |
411 | err_free_client: | |
6addb1d6 | 412 | evdev_detach_client(evdev, client); |
9657d75c | 413 | kfree(client); |
9657d75c | 414 | return error; |
1da177e4 LT |
415 | } |
416 | ||
6addb1d6 DT |
417 | static ssize_t evdev_write(struct file *file, const char __user *buffer, |
418 | size_t count, loff_t *ppos) | |
3a51f7c4 | 419 | { |
d0ffb9be DT |
420 | struct evdev_client *client = file->private_data; |
421 | struct evdev *evdev = client->evdev; | |
3a51f7c4 | 422 | struct input_event event; |
02dfc496 | 423 | int retval = 0; |
52658bb6 | 424 | |
2872a9b5 | 425 | if (count != 0 && count < input_event_size()) |
439581ec PK |
426 | return -EINVAL; |
427 | ||
6addb1d6 DT |
428 | retval = mutex_lock_interruptible(&evdev->mutex); |
429 | if (retval) | |
430 | return retval; | |
431 | ||
432 | if (!evdev->exist) { | |
433 | retval = -ENODEV; | |
434 | goto out; | |
435 | } | |
52658bb6 | 436 | |
2872a9b5 DT |
437 | while (retval + input_event_size() <= count) { |
438 | ||
2d56f3a3 | 439 | if (input_event_from_user(buffer + retval, &event)) { |
6addb1d6 DT |
440 | retval = -EFAULT; |
441 | goto out; | |
442 | } | |
439581ec | 443 | retval += input_event_size(); |
6addb1d6 DT |
444 | |
445 | input_inject_event(&evdev->handle, | |
446 | event.type, event.code, event.value); | |
2872a9b5 | 447 | } |
52658bb6 | 448 | |
6addb1d6 DT |
449 | out: |
450 | mutex_unlock(&evdev->mutex); | |
52658bb6 JK |
451 | return retval; |
452 | } | |
52658bb6 | 453 | |
6addb1d6 DT |
454 | static int evdev_fetch_next_event(struct evdev_client *client, |
455 | struct input_event *event) | |
456 | { | |
457 | int have_event; | |
458 | ||
459 | spin_lock_irq(&client->buffer_lock); | |
460 | ||
566cf5b6 | 461 | have_event = client->packet_head != client->tail; |
6addb1d6 DT |
462 | if (have_event) { |
463 | *event = client->buffer[client->tail++]; | |
b58f7086 | 464 | client->tail &= client->bufsize - 1; |
6addb1d6 DT |
465 | } |
466 | ||
467 | spin_unlock_irq(&client->buffer_lock); | |
468 | ||
469 | return have_event; | |
470 | } | |
471 | ||
472 | static ssize_t evdev_read(struct file *file, char __user *buffer, | |
473 | size_t count, loff_t *ppos) | |
1da177e4 | 474 | { |
d0ffb9be DT |
475 | struct evdev_client *client = file->private_data; |
476 | struct evdev *evdev = client->evdev; | |
6addb1d6 | 477 | struct input_event event; |
2872a9b5 DT |
478 | size_t read = 0; |
479 | int error; | |
1da177e4 | 480 | |
2872a9b5 | 481 | if (count != 0 && count < input_event_size()) |
1da177e4 LT |
482 | return -EINVAL; |
483 | ||
2872a9b5 DT |
484 | for (;;) { |
485 | if (!evdev->exist) | |
486 | return -ENODEV; | |
1da177e4 | 487 | |
2872a9b5 DT |
488 | if (client->packet_head == client->tail && |
489 | (file->f_flags & O_NONBLOCK)) | |
490 | return -EAGAIN; | |
491 | ||
492 | /* | |
493 | * count == 0 is special - no IO is done but we check | |
494 | * for error conditions (see above). | |
495 | */ | |
496 | if (count == 0) | |
497 | break; | |
1da177e4 | 498 | |
2872a9b5 DT |
499 | while (read + input_event_size() <= count && |
500 | evdev_fetch_next_event(client, &event)) { | |
3a51f7c4 | 501 | |
2872a9b5 DT |
502 | if (input_event_to_user(buffer + read, &event)) |
503 | return -EFAULT; | |
3a51f7c4 | 504 | |
2872a9b5 DT |
505 | read += input_event_size(); |
506 | } | |
1da177e4 | 507 | |
2872a9b5 DT |
508 | if (read) |
509 | break; | |
e90f869c | 510 | |
2872a9b5 DT |
511 | if (!(file->f_flags & O_NONBLOCK)) { |
512 | error = wait_event_interruptible(evdev->wait, | |
513 | client->packet_head != client->tail || | |
514 | !evdev->exist); | |
515 | if (error) | |
516 | return error; | |
517 | } | |
518 | } | |
519 | ||
520 | return read; | |
1da177e4 LT |
521 | } |
522 | ||
523 | /* No kernel lock - fine */ | |
524 | static unsigned int evdev_poll(struct file *file, poll_table *wait) | |
525 | { | |
d0ffb9be DT |
526 | struct evdev_client *client = file->private_data; |
527 | struct evdev *evdev = client->evdev; | |
c18fb139 | 528 | unsigned int mask; |
1e0afb28 | 529 | |
d0ffb9be | 530 | poll_wait(file, &evdev->wait, wait); |
c18fb139 DT |
531 | |
532 | mask = evdev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR; | |
cdda911c | 533 | if (client->packet_head != client->tail) |
c18fb139 DT |
534 | mask |= POLLIN | POLLRDNORM; |
535 | ||
536 | return mask; | |
1da177e4 LT |
537 | } |
538 | ||
3a51f7c4 DT |
539 | #ifdef CONFIG_COMPAT |
540 | ||
541 | #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) | |
7b19ada2 | 542 | #define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1) |
3a51f7c4 DT |
543 | |
544 | #ifdef __BIG_ENDIAN | |
545 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
546 | unsigned int maxlen, void __user *p, int compat) | |
547 | { | |
548 | int len, i; | |
549 | ||
550 | if (compat) { | |
7b19ada2 | 551 | len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t); |
bf61f8d3 | 552 | if (len > maxlen) |
3a51f7c4 DT |
553 | len = maxlen; |
554 | ||
555 | for (i = 0; i < len / sizeof(compat_long_t); i++) | |
556 | if (copy_to_user((compat_long_t __user *) p + i, | |
557 | (compat_long_t *) bits + | |
558 | i + 1 - ((i % 2) << 1), | |
559 | sizeof(compat_long_t))) | |
560 | return -EFAULT; | |
561 | } else { | |
7b19ada2 | 562 | len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
563 | if (len > maxlen) |
564 | len = maxlen; | |
565 | ||
566 | if (copy_to_user(p, bits, len)) | |
567 | return -EFAULT; | |
568 | } | |
569 | ||
570 | return len; | |
571 | } | |
572 | #else | |
573 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
574 | unsigned int maxlen, void __user *p, int compat) | |
575 | { | |
576 | int len = compat ? | |
7b19ada2 JS |
577 | BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) : |
578 | BITS_TO_LONGS(maxbit) * sizeof(long); | |
3a51f7c4 DT |
579 | |
580 | if (len > maxlen) | |
581 | len = maxlen; | |
582 | ||
583 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
584 | } | |
585 | #endif /* __BIG_ENDIAN */ | |
586 | ||
587 | #else | |
588 | ||
589 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
590 | unsigned int maxlen, void __user *p, int compat) | |
591 | { | |
7b19ada2 | 592 | int len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
593 | |
594 | if (len > maxlen) | |
595 | len = maxlen; | |
596 | ||
597 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
598 | } | |
599 | ||
600 | #endif /* CONFIG_COMPAT */ | |
601 | ||
602 | static int str_to_user(const char *str, unsigned int maxlen, void __user *p) | |
603 | { | |
604 | int len; | |
605 | ||
606 | if (!str) | |
607 | return -ENOENT; | |
608 | ||
609 | len = strlen(str) + 1; | |
610 | if (len > maxlen) | |
611 | len = maxlen; | |
612 | ||
613 | return copy_to_user(p, str, len) ? -EFAULT : len; | |
614 | } | |
615 | ||
f2afa771 | 616 | #define OLD_KEY_MAX 0x1ff |
448cd166 DT |
617 | static int handle_eviocgbit(struct input_dev *dev, |
618 | unsigned int type, unsigned int size, | |
619 | void __user *p, int compat_mode) | |
5402a734 | 620 | { |
f2afa771 | 621 | static unsigned long keymax_warn_time; |
5402a734 LT |
622 | unsigned long *bits; |
623 | int len; | |
624 | ||
448cd166 | 625 | switch (type) { |
5402a734 LT |
626 | |
627 | case 0: bits = dev->evbit; len = EV_MAX; break; | |
628 | case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; | |
629 | case EV_REL: bits = dev->relbit; len = REL_MAX; break; | |
630 | case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; | |
631 | case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; | |
632 | case EV_LED: bits = dev->ledbit; len = LED_MAX; break; | |
633 | case EV_SND: bits = dev->sndbit; len = SND_MAX; break; | |
634 | case EV_FF: bits = dev->ffbit; len = FF_MAX; break; | |
635 | case EV_SW: bits = dev->swbit; len = SW_MAX; break; | |
636 | default: return -EINVAL; | |
637 | } | |
f2afa771 DT |
638 | |
639 | /* | |
640 | * Work around bugs in userspace programs that like to do | |
641 | * EVIOCGBIT(EV_KEY, KEY_MAX) and not realize that 'len' | |
642 | * should be in bytes, not in bits. | |
643 | */ | |
448cd166 | 644 | if (type == EV_KEY && size == OLD_KEY_MAX) { |
f2afa771 DT |
645 | len = OLD_KEY_MAX; |
646 | if (printk_timed_ratelimit(&keymax_warn_time, 10 * 1000)) | |
da0c4901 JP |
647 | pr_warning("(EVIOCGBIT): Suspicious buffer size %u, " |
648 | "limiting output to %zu bytes. See " | |
649 | "http://userweb.kernel.org/~dtor/eviocgbit-bug.html\n", | |
650 | OLD_KEY_MAX, | |
651 | BITS_TO_LONGS(OLD_KEY_MAX) * sizeof(long)); | |
f2afa771 DT |
652 | } |
653 | ||
448cd166 | 654 | return bits_to_user(bits, len, size, p, compat_mode); |
5402a734 | 655 | } |
f2afa771 | 656 | #undef OLD_KEY_MAX |
5402a734 | 657 | |
ab4e0192 | 658 | static int evdev_handle_get_keycode(struct input_dev *dev, void __user *p) |
8613e4c2 | 659 | { |
ab4e0192 DT |
660 | struct input_keymap_entry ke = { |
661 | .len = sizeof(unsigned int), | |
662 | .flags = 0, | |
663 | }; | |
664 | int __user *ip = (int __user *)p; | |
8613e4c2 MCC |
665 | int error; |
666 | ||
ab4e0192 DT |
667 | /* legacy case */ |
668 | if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) | |
669 | return -EFAULT; | |
8613e4c2 | 670 | |
ab4e0192 DT |
671 | error = input_get_keycode(dev, &ke); |
672 | if (error) | |
673 | return error; | |
8613e4c2 | 674 | |
ab4e0192 DT |
675 | if (put_user(ke.keycode, ip + 1)) |
676 | return -EFAULT; | |
8613e4c2 | 677 | |
ab4e0192 DT |
678 | return 0; |
679 | } | |
8613e4c2 | 680 | |
ab4e0192 DT |
681 | static int evdev_handle_get_keycode_v2(struct input_dev *dev, void __user *p) |
682 | { | |
683 | struct input_keymap_entry ke; | |
684 | int error; | |
8613e4c2 | 685 | |
ab4e0192 DT |
686 | if (copy_from_user(&ke, p, sizeof(ke))) |
687 | return -EFAULT; | |
8613e4c2 | 688 | |
ab4e0192 DT |
689 | error = input_get_keycode(dev, &ke); |
690 | if (error) | |
691 | return error; | |
8613e4c2 | 692 | |
ab4e0192 DT |
693 | if (copy_to_user(p, &ke, sizeof(ke))) |
694 | return -EFAULT; | |
8613e4c2 | 695 | |
8613e4c2 MCC |
696 | return 0; |
697 | } | |
698 | ||
ab4e0192 | 699 | static int evdev_handle_set_keycode(struct input_dev *dev, void __user *p) |
8613e4c2 | 700 | { |
ab4e0192 DT |
701 | struct input_keymap_entry ke = { |
702 | .len = sizeof(unsigned int), | |
703 | .flags = 0, | |
704 | }; | |
705 | int __user *ip = (int __user *)p; | |
8613e4c2 | 706 | |
ab4e0192 DT |
707 | if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) |
708 | return -EFAULT; | |
8613e4c2 | 709 | |
ab4e0192 DT |
710 | if (get_user(ke.keycode, ip + 1)) |
711 | return -EFAULT; | |
8613e4c2 | 712 | |
ab4e0192 DT |
713 | return input_set_keycode(dev, &ke); |
714 | } | |
8613e4c2 | 715 | |
ab4e0192 DT |
716 | static int evdev_handle_set_keycode_v2(struct input_dev *dev, void __user *p) |
717 | { | |
718 | struct input_keymap_entry ke; | |
8613e4c2 | 719 | |
ab4e0192 DT |
720 | if (copy_from_user(&ke, p, sizeof(ke))) |
721 | return -EFAULT; | |
8613e4c2 | 722 | |
ab4e0192 DT |
723 | if (ke.len > sizeof(ke.scancode)) |
724 | return -EINVAL; | |
8613e4c2 MCC |
725 | |
726 | return input_set_keycode(dev, &ke); | |
727 | } | |
728 | ||
48318028 DH |
729 | /* |
730 | * If we transfer state to the user, we should flush all pending events | |
731 | * of the same type from the client's queue. Otherwise, they might end up | |
732 | * with duplicate events, which can screw up client's state tracking. | |
733 | * If bits_to_user fails after flushing the queue, we queue a SYN_DROPPED | |
734 | * event so user-space will notice missing events. | |
735 | * | |
736 | * LOCKING: | |
737 | * We need to take event_lock before buffer_lock to avoid dead-locks. But we | |
738 | * need the even_lock only to guarantee consistent state. We can safely release | |
739 | * it while flushing the queue. This allows input-core to handle filters while | |
740 | * we flush the queue. | |
741 | */ | |
742 | static int evdev_handle_get_val(struct evdev_client *client, | |
743 | struct input_dev *dev, unsigned int type, | |
744 | unsigned long *bits, unsigned int max, | |
745 | unsigned int size, void __user *p, int compat) | |
746 | { | |
747 | int ret; | |
748 | unsigned long *mem; | |
749 | ||
750 | mem = kmalloc(sizeof(unsigned long) * max, GFP_KERNEL); | |
751 | if (!mem) | |
752 | return -ENOMEM; | |
753 | ||
754 | spin_lock_irq(&dev->event_lock); | |
755 | spin_lock(&client->buffer_lock); | |
756 | ||
757 | memcpy(mem, bits, sizeof(unsigned long) * max); | |
758 | ||
759 | spin_unlock(&dev->event_lock); | |
760 | ||
761 | __evdev_flush_queue(client, type); | |
762 | ||
763 | spin_unlock_irq(&client->buffer_lock); | |
764 | ||
765 | ret = bits_to_user(mem, max, size, p, compat); | |
766 | if (ret < 0) | |
767 | evdev_queue_syn_dropped(client); | |
768 | ||
769 | kfree(mem); | |
770 | ||
771 | return ret; | |
772 | } | |
773 | ||
1cf0c6e6 HR |
774 | static int evdev_handle_mt_request(struct input_dev *dev, |
775 | unsigned int size, | |
776 | int __user *ip) | |
777 | { | |
8d18fba2 | 778 | const struct input_mt *mt = dev->mt; |
1cf0c6e6 HR |
779 | unsigned int code; |
780 | int max_slots; | |
781 | int i; | |
782 | ||
783 | if (get_user(code, &ip[0])) | |
784 | return -EFAULT; | |
8d18fba2 | 785 | if (!mt || !input_is_mt_value(code)) |
1cf0c6e6 HR |
786 | return -EINVAL; |
787 | ||
788 | max_slots = (size - sizeof(__u32)) / sizeof(__s32); | |
8d18fba2 HR |
789 | for (i = 0; i < mt->num_slots && i < max_slots; i++) { |
790 | int value = input_mt_get_value(&mt->slots[i], code); | |
791 | if (put_user(value, &ip[1 + i])) | |
1cf0c6e6 | 792 | return -EFAULT; |
8d18fba2 | 793 | } |
1cf0c6e6 HR |
794 | |
795 | return 0; | |
796 | } | |
797 | ||
6addb1d6 DT |
798 | static long evdev_do_ioctl(struct file *file, unsigned int cmd, |
799 | void __user *p, int compat_mode) | |
1da177e4 | 800 | { |
d0ffb9be DT |
801 | struct evdev_client *client = file->private_data; |
802 | struct evdev *evdev = client->evdev; | |
1da177e4 LT |
803 | struct input_dev *dev = evdev->handle.dev; |
804 | struct input_absinfo abs; | |
509ca1a9 | 805 | struct ff_effect effect; |
3a51f7c4 | 806 | int __user *ip = (int __user *)p; |
58b93995 | 807 | unsigned int i, t, u, v; |
448cd166 | 808 | unsigned int size; |
509ca1a9 | 809 | int error; |
1da177e4 | 810 | |
448cd166 | 811 | /* First we check for fixed-length commands */ |
1da177e4 LT |
812 | switch (cmd) { |
813 | ||
6addb1d6 DT |
814 | case EVIOCGVERSION: |
815 | return put_user(EV_VERSION, ip); | |
1da177e4 | 816 | |
6addb1d6 DT |
817 | case EVIOCGID: |
818 | if (copy_to_user(p, &dev->id, sizeof(struct input_id))) | |
819 | return -EFAULT; | |
820 | return 0; | |
08791e5c | 821 | |
6addb1d6 DT |
822 | case EVIOCGREP: |
823 | if (!test_bit(EV_REP, dev->evbit)) | |
824 | return -ENOSYS; | |
825 | if (put_user(dev->rep[REP_DELAY], ip)) | |
826 | return -EFAULT; | |
827 | if (put_user(dev->rep[REP_PERIOD], ip + 1)) | |
828 | return -EFAULT; | |
829 | return 0; | |
08791e5c | 830 | |
6addb1d6 DT |
831 | case EVIOCSREP: |
832 | if (!test_bit(EV_REP, dev->evbit)) | |
833 | return -ENOSYS; | |
834 | if (get_user(u, ip)) | |
835 | return -EFAULT; | |
836 | if (get_user(v, ip + 1)) | |
837 | return -EFAULT; | |
08791e5c | 838 | |
6addb1d6 DT |
839 | input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u); |
840 | input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v); | |
3a51f7c4 | 841 | |
6addb1d6 | 842 | return 0; |
1da177e4 | 843 | |
6addb1d6 DT |
844 | case EVIOCRMFF: |
845 | return input_ff_erase(dev, (int)(unsigned long) p, file); | |
1da177e4 | 846 | |
6addb1d6 DT |
847 | case EVIOCGEFFECTS: |
848 | i = test_bit(EV_FF, dev->evbit) ? | |
849 | dev->ff->max_effects : 0; | |
850 | if (put_user(i, ip)) | |
851 | return -EFAULT; | |
852 | return 0; | |
853 | ||
854 | case EVIOCGRAB: | |
855 | if (p) | |
856 | return evdev_grab(evdev, client); | |
857 | else | |
858 | return evdev_ungrab(evdev, client); | |
ab4e0192 | 859 | |
a80b83b7 JS |
860 | case EVIOCSCLOCKID: |
861 | if (copy_from_user(&i, p, sizeof(unsigned int))) | |
862 | return -EFAULT; | |
863 | if (i != CLOCK_MONOTONIC && i != CLOCK_REALTIME) | |
864 | return -EINVAL; | |
865 | client->clkid = i; | |
866 | return 0; | |
867 | ||
ab4e0192 DT |
868 | case EVIOCGKEYCODE: |
869 | return evdev_handle_get_keycode(dev, p); | |
870 | ||
871 | case EVIOCSKEYCODE: | |
872 | return evdev_handle_set_keycode(dev, p); | |
873 | ||
874 | case EVIOCGKEYCODE_V2: | |
875 | return evdev_handle_get_keycode_v2(dev, p); | |
876 | ||
877 | case EVIOCSKEYCODE_V2: | |
878 | return evdev_handle_set_keycode_v2(dev, p); | |
448cd166 | 879 | } |
1da177e4 | 880 | |
448cd166 | 881 | size = _IOC_SIZE(cmd); |
1da177e4 | 882 | |
448cd166 DT |
883 | /* Now check variable-length commands */ |
884 | #define EVIOC_MASK_SIZE(nr) ((nr) & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) | |
448cd166 | 885 | switch (EVIOC_MASK_SIZE(cmd)) { |
41e979f8 | 886 | |
85b77200 HR |
887 | case EVIOCGPROP(0): |
888 | return bits_to_user(dev->propbit, INPUT_PROP_MAX, | |
889 | size, p, compat_mode); | |
890 | ||
1cf0c6e6 HR |
891 | case EVIOCGMTSLOTS(0): |
892 | return evdev_handle_mt_request(dev, size, ip); | |
893 | ||
448cd166 | 894 | case EVIOCGKEY(0): |
48318028 DH |
895 | return evdev_handle_get_val(client, dev, EV_KEY, dev->key, |
896 | KEY_MAX, size, p, compat_mode); | |
1da177e4 | 897 | |
448cd166 | 898 | case EVIOCGLED(0): |
48318028 DH |
899 | return evdev_handle_get_val(client, dev, EV_LED, dev->led, |
900 | LED_MAX, size, p, compat_mode); | |
1da177e4 | 901 | |
448cd166 | 902 | case EVIOCGSND(0): |
48318028 DH |
903 | return evdev_handle_get_val(client, dev, EV_SND, dev->snd, |
904 | SND_MAX, size, p, compat_mode); | |
1da177e4 | 905 | |
448cd166 | 906 | case EVIOCGSW(0): |
48318028 DH |
907 | return evdev_handle_get_val(client, dev, EV_SW, dev->sw, |
908 | SW_MAX, size, p, compat_mode); | |
31581066 | 909 | |
448cd166 DT |
910 | case EVIOCGNAME(0): |
911 | return str_to_user(dev->name, size, p); | |
1da177e4 | 912 | |
448cd166 DT |
913 | case EVIOCGPHYS(0): |
914 | return str_to_user(dev->phys, size, p); | |
1da177e4 | 915 | |
448cd166 DT |
916 | case EVIOCGUNIQ(0): |
917 | return str_to_user(dev->uniq, size, p); | |
1da177e4 | 918 | |
448cd166 DT |
919 | case EVIOC_MASK_SIZE(EVIOCSFF): |
920 | if (input_ff_effect_from_user(p, size, &effect)) | |
921 | return -EFAULT; | |
1da177e4 | 922 | |
448cd166 | 923 | error = input_ff_upload(dev, &effect, file); |
1da177e4 | 924 | |
448cd166 DT |
925 | if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) |
926 | return -EFAULT; | |
41e979f8 | 927 | |
448cd166 DT |
928 | return error; |
929 | } | |
1da177e4 | 930 | |
448cd166 DT |
931 | /* Multi-number variable-length handlers */ |
932 | if (_IOC_TYPE(cmd) != 'E') | |
933 | return -EINVAL; | |
1da177e4 | 934 | |
448cd166 | 935 | if (_IOC_DIR(cmd) == _IOC_READ) { |
6addb1d6 | 936 | |
448cd166 DT |
937 | if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0))) |
938 | return handle_eviocgbit(dev, | |
939 | _IOC_NR(cmd) & EV_MAX, size, | |
940 | p, compat_mode); | |
1da177e4 | 941 | |
448cd166 | 942 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { |
f2278f31 | 943 | |
0a74a1df DM |
944 | if (!dev->absinfo) |
945 | return -EINVAL; | |
946 | ||
448cd166 DT |
947 | t = _IOC_NR(cmd) & ABS_MAX; |
948 | abs = dev->absinfo[t]; | |
f2278f31 | 949 | |
448cd166 DT |
950 | if (copy_to_user(p, &abs, min_t(size_t, |
951 | size, sizeof(struct input_absinfo)))) | |
952 | return -EFAULT; | |
f2278f31 | 953 | |
448cd166 DT |
954 | return 0; |
955 | } | |
956 | } | |
f2278f31 | 957 | |
f9ce6eb5 | 958 | if (_IOC_DIR(cmd) == _IOC_WRITE) { |
f2278f31 | 959 | |
448cd166 | 960 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { |
1da177e4 | 961 | |
0a74a1df DM |
962 | if (!dev->absinfo) |
963 | return -EINVAL; | |
964 | ||
448cd166 | 965 | t = _IOC_NR(cmd) & ABS_MAX; |
41e979f8 | 966 | |
448cd166 DT |
967 | if (copy_from_user(&abs, p, min_t(size_t, |
968 | size, sizeof(struct input_absinfo)))) | |
969 | return -EFAULT; | |
1da177e4 | 970 | |
448cd166 DT |
971 | if (size < sizeof(struct input_absinfo)) |
972 | abs.resolution = 0; | |
d31b2865 | 973 | |
448cd166 DT |
974 | /* We can't change number of reserved MT slots */ |
975 | if (t == ABS_MT_SLOT) | |
976 | return -EINVAL; | |
40d007e7 | 977 | |
448cd166 DT |
978 | /* |
979 | * Take event lock to ensure that we are not | |
980 | * changing device parameters in the middle | |
981 | * of event. | |
982 | */ | |
983 | spin_lock_irq(&dev->event_lock); | |
984 | dev->absinfo[t] = abs; | |
985 | spin_unlock_irq(&dev->event_lock); | |
6addb1d6 | 986 | |
448cd166 | 987 | return 0; |
6addb1d6 | 988 | } |
1da177e4 | 989 | } |
448cd166 | 990 | |
1da177e4 LT |
991 | return -EINVAL; |
992 | } | |
1da177e4 | 993 | |
6addb1d6 DT |
994 | static long evdev_ioctl_handler(struct file *file, unsigned int cmd, |
995 | void __user *p, int compat_mode) | |
996 | { | |
997 | struct evdev_client *client = file->private_data; | |
998 | struct evdev *evdev = client->evdev; | |
999 | int retval; | |
1000 | ||
1001 | retval = mutex_lock_interruptible(&evdev->mutex); | |
1002 | if (retval) | |
1003 | return retval; | |
1004 | ||
1005 | if (!evdev->exist) { | |
1006 | retval = -ENODEV; | |
1007 | goto out; | |
1008 | } | |
1009 | ||
1010 | retval = evdev_do_ioctl(file, cmd, p, compat_mode); | |
1011 | ||
1012 | out: | |
1013 | mutex_unlock(&evdev->mutex); | |
1014 | return retval; | |
1015 | } | |
1016 | ||
3a51f7c4 DT |
1017 | static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1018 | { | |
1019 | return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0); | |
1020 | } | |
41e979f8 | 1021 | |
3a51f7c4 | 1022 | #ifdef CONFIG_COMPAT |
6addb1d6 DT |
1023 | static long evdev_ioctl_compat(struct file *file, |
1024 | unsigned int cmd, unsigned long arg) | |
52658bb6 | 1025 | { |
3a51f7c4 | 1026 | return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1); |
1da177e4 | 1027 | } |
52658bb6 | 1028 | #endif |
1da177e4 | 1029 | |
66e66118 | 1030 | static const struct file_operations evdev_fops = { |
6addb1d6 DT |
1031 | .owner = THIS_MODULE, |
1032 | .read = evdev_read, | |
1033 | .write = evdev_write, | |
1034 | .poll = evdev_poll, | |
1035 | .open = evdev_open, | |
1036 | .release = evdev_release, | |
1037 | .unlocked_ioctl = evdev_ioctl, | |
52658bb6 | 1038 | #ifdef CONFIG_COMPAT |
6addb1d6 | 1039 | .compat_ioctl = evdev_ioctl_compat, |
52658bb6 | 1040 | #endif |
6addb1d6 | 1041 | .fasync = evdev_fasync, |
6038f373 AB |
1042 | .flush = evdev_flush, |
1043 | .llseek = no_llseek, | |
1da177e4 LT |
1044 | }; |
1045 | ||
6addb1d6 DT |
1046 | /* |
1047 | * Mark device non-existent. This disables writes, ioctls and | |
1048 | * prevents new users from opening the device. Already posted | |
1049 | * blocking reads will stay, however new ones will fail. | |
1050 | */ | |
1051 | static void evdev_mark_dead(struct evdev *evdev) | |
1052 | { | |
1053 | mutex_lock(&evdev->mutex); | |
20da92de | 1054 | evdev->exist = false; |
6addb1d6 DT |
1055 | mutex_unlock(&evdev->mutex); |
1056 | } | |
1057 | ||
1058 | static void evdev_cleanup(struct evdev *evdev) | |
1059 | { | |
1060 | struct input_handle *handle = &evdev->handle; | |
1061 | ||
1062 | evdev_mark_dead(evdev); | |
1063 | evdev_hangup(evdev); | |
7f8d4cad DT |
1064 | |
1065 | cdev_del(&evdev->cdev); | |
6addb1d6 DT |
1066 | |
1067 | /* evdev is marked dead so no one else accesses evdev->open */ | |
1068 | if (evdev->open) { | |
1069 | input_flush_device(handle, NULL); | |
1070 | input_close_device(handle); | |
1071 | } | |
1072 | } | |
1073 | ||
1074 | /* | |
1075 | * Create new evdev device. Note that input core serializes calls | |
7f8d4cad | 1076 | * to connect and disconnect. |
6addb1d6 | 1077 | */ |
5b2a0826 DT |
1078 | static int evdev_connect(struct input_handler *handler, struct input_dev *dev, |
1079 | const struct input_device_id *id) | |
1da177e4 LT |
1080 | { |
1081 | struct evdev *evdev; | |
1082 | int minor; | |
7f8d4cad | 1083 | int dev_no; |
5b2a0826 | 1084 | int error; |
1da177e4 | 1085 | |
7f8d4cad DT |
1086 | minor = input_get_new_minor(EVDEV_MINOR_BASE, EVDEV_MINORS, true); |
1087 | if (minor < 0) { | |
1088 | error = minor; | |
1089 | pr_err("failed to reserve new minor: %d\n", error); | |
1090 | return error; | |
1da177e4 LT |
1091 | } |
1092 | ||
5b2a0826 | 1093 | evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL); |
7f8d4cad DT |
1094 | if (!evdev) { |
1095 | error = -ENOMEM; | |
1096 | goto err_free_minor; | |
1097 | } | |
1da177e4 | 1098 | |
d0ffb9be | 1099 | INIT_LIST_HEAD(&evdev->client_list); |
6addb1d6 DT |
1100 | spin_lock_init(&evdev->client_lock); |
1101 | mutex_init(&evdev->mutex); | |
1da177e4 | 1102 | init_waitqueue_head(&evdev->wait); |
20da92de | 1103 | evdev->exist = true; |
7f8d4cad DT |
1104 | |
1105 | dev_no = minor; | |
1106 | /* Normalize device number if it falls into legacy range */ | |
1107 | if (dev_no < EVDEV_MINOR_BASE + EVDEV_MINORS) | |
1108 | dev_no -= EVDEV_MINOR_BASE; | |
1109 | dev_set_name(&evdev->dev, "event%d", dev_no); | |
6addb1d6 | 1110 | |
a7097ff8 | 1111 | evdev->handle.dev = input_get_device(dev); |
3d5cb60e | 1112 | evdev->handle.name = dev_name(&evdev->dev); |
1da177e4 LT |
1113 | evdev->handle.handler = handler; |
1114 | evdev->handle.private = evdev; | |
1da177e4 | 1115 | |
7f8d4cad | 1116 | evdev->dev.devt = MKDEV(INPUT_MAJOR, minor); |
9657d75c DT |
1117 | evdev->dev.class = &input_class; |
1118 | evdev->dev.parent = &dev->dev; | |
9657d75c DT |
1119 | evdev->dev.release = evdev_free; |
1120 | device_initialize(&evdev->dev); | |
5b2a0826 | 1121 | |
6addb1d6 | 1122 | error = input_register_handle(&evdev->handle); |
5b2a0826 | 1123 | if (error) |
9657d75c | 1124 | goto err_free_evdev; |
5b2a0826 | 1125 | |
7f8d4cad | 1126 | cdev_init(&evdev->cdev, &evdev_fops); |
4a215aad | 1127 | evdev->cdev.kobj.parent = &evdev->dev.kobj; |
7f8d4cad | 1128 | error = cdev_add(&evdev->cdev, evdev->dev.devt, 1); |
6addb1d6 DT |
1129 | if (error) |
1130 | goto err_unregister_handle; | |
1131 | ||
1132 | error = device_add(&evdev->dev); | |
5b2a0826 | 1133 | if (error) |
6addb1d6 | 1134 | goto err_cleanup_evdev; |
1da177e4 | 1135 | |
5b2a0826 | 1136 | return 0; |
1da177e4 | 1137 | |
6addb1d6 DT |
1138 | err_cleanup_evdev: |
1139 | evdev_cleanup(evdev); | |
1140 | err_unregister_handle: | |
1141 | input_unregister_handle(&evdev->handle); | |
5b2a0826 | 1142 | err_free_evdev: |
9657d75c | 1143 | put_device(&evdev->dev); |
7f8d4cad DT |
1144 | err_free_minor: |
1145 | input_free_minor(minor); | |
5b2a0826 | 1146 | return error; |
1da177e4 LT |
1147 | } |
1148 | ||
1149 | static void evdev_disconnect(struct input_handle *handle) | |
1150 | { | |
1151 | struct evdev *evdev = handle->private; | |
1da177e4 | 1152 | |
9657d75c | 1153 | device_del(&evdev->dev); |
6addb1d6 | 1154 | evdev_cleanup(evdev); |
7f8d4cad | 1155 | input_free_minor(MINOR(evdev->dev.devt)); |
6addb1d6 | 1156 | input_unregister_handle(handle); |
9657d75c | 1157 | put_device(&evdev->dev); |
1da177e4 LT |
1158 | } |
1159 | ||
66e66118 | 1160 | static const struct input_device_id evdev_ids[] = { |
1da177e4 LT |
1161 | { .driver_info = 1 }, /* Matches all devices */ |
1162 | { }, /* Terminating zero entry */ | |
1163 | }; | |
1164 | ||
1165 | MODULE_DEVICE_TABLE(input, evdev_ids); | |
1166 | ||
1167 | static struct input_handler evdev_handler = { | |
6addb1d6 | 1168 | .event = evdev_event, |
a274ac15 | 1169 | .events = evdev_events, |
6addb1d6 DT |
1170 | .connect = evdev_connect, |
1171 | .disconnect = evdev_disconnect, | |
7f8d4cad | 1172 | .legacy_minors = true, |
6addb1d6 DT |
1173 | .minor = EVDEV_MINOR_BASE, |
1174 | .name = "evdev", | |
1175 | .id_table = evdev_ids, | |
1da177e4 LT |
1176 | }; |
1177 | ||
1178 | static int __init evdev_init(void) | |
1179 | { | |
4263cf0f | 1180 | return input_register_handler(&evdev_handler); |
1da177e4 LT |
1181 | } |
1182 | ||
1183 | static void __exit evdev_exit(void) | |
1184 | { | |
1185 | input_unregister_handler(&evdev_handler); | |
1186 | } | |
1187 | ||
1188 | module_init(evdev_init); | |
1189 | module_exit(evdev_exit); | |
1190 | ||
1191 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
1192 | MODULE_DESCRIPTION("Input driver event char devices"); | |
1193 | MODULE_LICENSE("GPL"); |