Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Event char devices, giving access to raw input device events. | |
3 | * | |
4 | * Copyright (c) 1999-2002 Vojtech Pavlik | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License version 2 as published by | |
8 | * the Free Software Foundation. | |
9 | */ | |
10 | ||
da0c4901 JP |
11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
12 | ||
1da177e4 LT |
13 | #define EVDEV_MINOR_BASE 64 |
14 | #define EVDEV_MINORS 32 | |
63a6404d HR |
15 | #define EVDEV_MIN_BUFFER_SIZE 64U |
16 | #define EVDEV_BUF_PACKETS 8 | |
1da177e4 LT |
17 | |
18 | #include <linux/poll.h> | |
a99bbaf5 | 19 | #include <linux/sched.h> |
1da177e4 LT |
20 | #include <linux/slab.h> |
21 | #include <linux/module.h> | |
22 | #include <linux/init.h> | |
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; |
c7dc6573 | 51 | bool revoked; |
9fb0f14e | 52 | unsigned int bufsize; |
b58f7086 | 53 | struct input_event buffer[]; |
1da177e4 LT |
54 | }; |
55 | ||
48318028 DH |
56 | /* flush queued events of type @type, caller must hold client->buffer_lock */ |
57 | static void __evdev_flush_queue(struct evdev_client *client, unsigned int type) | |
58 | { | |
59 | unsigned int i, head, num; | |
60 | unsigned int mask = client->bufsize - 1; | |
61 | bool is_report; | |
62 | struct input_event *ev; | |
63 | ||
64 | BUG_ON(type == EV_SYN); | |
65 | ||
66 | head = client->tail; | |
67 | client->packet_head = client->tail; | |
68 | ||
69 | /* init to 1 so a leading SYN_REPORT will not be dropped */ | |
70 | num = 1; | |
71 | ||
72 | for (i = client->tail; i != client->head; i = (i + 1) & mask) { | |
73 | ev = &client->buffer[i]; | |
74 | is_report = ev->type == EV_SYN && ev->code == SYN_REPORT; | |
75 | ||
76 | if (ev->type == type) { | |
77 | /* drop matched entry */ | |
78 | continue; | |
79 | } else if (is_report && !num) { | |
80 | /* drop empty SYN_REPORT groups */ | |
81 | continue; | |
82 | } else if (head != i) { | |
83 | /* move entry to fill the gap */ | |
84 | client->buffer[head].time = ev->time; | |
85 | client->buffer[head].type = ev->type; | |
86 | client->buffer[head].code = ev->code; | |
87 | client->buffer[head].value = ev->value; | |
88 | } | |
89 | ||
90 | num++; | |
91 | head = (head + 1) & mask; | |
92 | ||
93 | if (is_report) { | |
94 | num = 0; | |
95 | client->packet_head = head; | |
96 | } | |
97 | } | |
98 | ||
99 | client->head = head; | |
100 | } | |
101 | ||
102 | /* queue SYN_DROPPED event */ | |
103 | static void evdev_queue_syn_dropped(struct evdev_client *client) | |
104 | { | |
105 | unsigned long flags; | |
106 | struct input_event ev; | |
107 | ktime_t time; | |
108 | ||
109 | time = ktime_get(); | |
110 | if (client->clkid != CLOCK_MONOTONIC) | |
111 | time = ktime_sub(time, ktime_get_monotonic_offset()); | |
112 | ||
113 | ev.time = ktime_to_timeval(time); | |
114 | ev.type = EV_SYN; | |
115 | ev.code = SYN_DROPPED; | |
116 | ev.value = 0; | |
117 | ||
118 | spin_lock_irqsave(&client->buffer_lock, flags); | |
119 | ||
120 | client->buffer[client->head++] = ev; | |
121 | client->head &= client->bufsize - 1; | |
122 | ||
123 | if (unlikely(client->head == client->tail)) { | |
124 | /* drop queue but keep our SYN_DROPPED event */ | |
125 | client->tail = (client->head - 1) & (client->bufsize - 1); | |
126 | client->packet_head = client->tail; | |
127 | } | |
128 | ||
129 | spin_unlock_irqrestore(&client->buffer_lock, flags); | |
130 | } | |
131 | ||
a274ac15 HR |
132 | static void __pass_event(struct evdev_client *client, |
133 | const struct input_event *event) | |
6addb1d6 | 134 | { |
9fb0f14e JB |
135 | client->buffer[client->head++] = *event; |
136 | client->head &= client->bufsize - 1; | |
137 | ||
138 | if (unlikely(client->head == client->tail)) { | |
139 | /* | |
140 | * This effectively "drops" all unconsumed events, leaving | |
141 | * EV_SYN/SYN_DROPPED plus the newest event in the queue. | |
142 | */ | |
143 | client->tail = (client->head - 2) & (client->bufsize - 1); | |
144 | ||
145 | client->buffer[client->tail].time = event->time; | |
146 | client->buffer[client->tail].type = EV_SYN; | |
147 | client->buffer[client->tail].code = SYN_DROPPED; | |
148 | client->buffer[client->tail].value = 0; | |
9fb0f14e | 149 | |
cdda911c JB |
150 | client->packet_head = client->tail; |
151 | } | |
6addb1d6 | 152 | |
cdda911c JB |
153 | if (event->type == EV_SYN && event->code == SYN_REPORT) { |
154 | client->packet_head = client->head; | |
30a589fd | 155 | kill_fasync(&client->fasync, SIGIO, POLL_IN); |
cdda911c | 156 | } |
a274ac15 HR |
157 | } |
158 | ||
159 | static void evdev_pass_values(struct evdev_client *client, | |
160 | const struct input_value *vals, unsigned int count, | |
161 | ktime_t mono, ktime_t real) | |
162 | { | |
163 | struct evdev *evdev = client->evdev; | |
164 | const struct input_value *v; | |
165 | struct input_event event; | |
166 | bool wakeup = false; | |
167 | ||
c7dc6573 DH |
168 | if (client->revoked) |
169 | return; | |
170 | ||
a274ac15 HR |
171 | event.time = ktime_to_timeval(client->clkid == CLOCK_MONOTONIC ? |
172 | mono : real); | |
173 | ||
174 | /* Interrupts are disabled, just acquire the lock. */ | |
175 | spin_lock(&client->buffer_lock); | |
176 | ||
177 | for (v = vals; v != vals + count; v++) { | |
178 | event.type = v->type; | |
179 | event.code = v->code; | |
180 | event.value = v->value; | |
181 | __pass_event(client, &event); | |
182 | if (v->type == EV_SYN && v->code == SYN_REPORT) | |
183 | wakeup = true; | |
184 | } | |
cdda911c JB |
185 | |
186 | spin_unlock(&client->buffer_lock); | |
a274ac15 HR |
187 | |
188 | if (wakeup) | |
189 | wake_up_interruptible(&evdev->wait); | |
6addb1d6 DT |
190 | } |
191 | ||
192 | /* | |
a274ac15 | 193 | * Pass incoming events to all connected clients. |
6addb1d6 | 194 | */ |
a274ac15 HR |
195 | static void evdev_events(struct input_handle *handle, |
196 | const struct input_value *vals, unsigned int count) | |
1da177e4 LT |
197 | { |
198 | struct evdev *evdev = handle->private; | |
d0ffb9be | 199 | struct evdev_client *client; |
a80b83b7 JS |
200 | ktime_t time_mono, time_real; |
201 | ||
202 | time_mono = ktime_get(); | |
203 | time_real = ktime_sub(time_mono, ktime_get_monotonic_offset()); | |
1da177e4 | 204 | |
82ba56c2 DT |
205 | rcu_read_lock(); |
206 | ||
6addb1d6 | 207 | client = rcu_dereference(evdev->grab); |
a80b83b7 | 208 | |
6addb1d6 | 209 | if (client) |
a274ac15 | 210 | evdev_pass_values(client, vals, count, time_mono, time_real); |
6addb1d6 DT |
211 | else |
212 | list_for_each_entry_rcu(client, &evdev->client_list, node) | |
a274ac15 HR |
213 | evdev_pass_values(client, vals, count, |
214 | time_mono, time_real); | |
1da177e4 | 215 | |
82ba56c2 | 216 | rcu_read_unlock(); |
a274ac15 | 217 | } |
82ba56c2 | 218 | |
a274ac15 HR |
219 | /* |
220 | * Pass incoming event to all connected clients. | |
221 | */ | |
222 | static void evdev_event(struct input_handle *handle, | |
223 | unsigned int type, unsigned int code, int value) | |
224 | { | |
225 | struct input_value vals[] = { { type, code, value } }; | |
226 | ||
227 | evdev_events(handle, vals, 1); | |
1da177e4 LT |
228 | } |
229 | ||
230 | static int evdev_fasync(int fd, struct file *file, int on) | |
231 | { | |
d0ffb9be | 232 | struct evdev_client *client = file->private_data; |
1e0afb28 | 233 | |
60aa4924 | 234 | return fasync_helper(fd, file, on, &client->fasync); |
1da177e4 LT |
235 | } |
236 | ||
1e0afb28 | 237 | static int evdev_flush(struct file *file, fl_owner_t id) |
1da177e4 | 238 | { |
d0ffb9be DT |
239 | struct evdev_client *client = file->private_data; |
240 | struct evdev *evdev = client->evdev; | |
6addb1d6 DT |
241 | int retval; |
242 | ||
243 | retval = mutex_lock_interruptible(&evdev->mutex); | |
244 | if (retval) | |
245 | return retval; | |
1e0afb28 | 246 | |
c7dc6573 | 247 | if (!evdev->exist || client->revoked) |
6addb1d6 DT |
248 | retval = -ENODEV; |
249 | else | |
250 | retval = input_flush_device(&evdev->handle, file); | |
1e0afb28 | 251 | |
6addb1d6 DT |
252 | mutex_unlock(&evdev->mutex); |
253 | return retval; | |
1da177e4 LT |
254 | } |
255 | ||
9657d75c | 256 | static void evdev_free(struct device *dev) |
1da177e4 | 257 | { |
9657d75c DT |
258 | struct evdev *evdev = container_of(dev, struct evdev, dev); |
259 | ||
a7097ff8 | 260 | input_put_device(evdev->handle.dev); |
1da177e4 LT |
261 | kfree(evdev); |
262 | } | |
263 | ||
6addb1d6 DT |
264 | /* |
265 | * Grabs an event device (along with underlying input device). | |
266 | * This function is called with evdev->mutex taken. | |
267 | */ | |
268 | static int evdev_grab(struct evdev *evdev, struct evdev_client *client) | |
269 | { | |
270 | int error; | |
271 | ||
272 | if (evdev->grab) | |
273 | return -EBUSY; | |
274 | ||
275 | error = input_grab_device(&evdev->handle); | |
276 | if (error) | |
277 | return error; | |
278 | ||
279 | rcu_assign_pointer(evdev->grab, client); | |
6addb1d6 DT |
280 | |
281 | return 0; | |
282 | } | |
283 | ||
284 | static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client) | |
285 | { | |
dba42580 DT |
286 | struct evdev_client *grab = rcu_dereference_protected(evdev->grab, |
287 | lockdep_is_held(&evdev->mutex)); | |
288 | ||
289 | if (grab != client) | |
6addb1d6 DT |
290 | return -EINVAL; |
291 | ||
292 | rcu_assign_pointer(evdev->grab, NULL); | |
82ba56c2 | 293 | synchronize_rcu(); |
6addb1d6 DT |
294 | input_release_device(&evdev->handle); |
295 | ||
296 | return 0; | |
297 | } | |
298 | ||
299 | static void evdev_attach_client(struct evdev *evdev, | |
300 | struct evdev_client *client) | |
301 | { | |
302 | spin_lock(&evdev->client_lock); | |
303 | list_add_tail_rcu(&client->node, &evdev->client_list); | |
304 | spin_unlock(&evdev->client_lock); | |
6addb1d6 DT |
305 | } |
306 | ||
307 | static void evdev_detach_client(struct evdev *evdev, | |
308 | struct evdev_client *client) | |
309 | { | |
310 | spin_lock(&evdev->client_lock); | |
311 | list_del_rcu(&client->node); | |
312 | spin_unlock(&evdev->client_lock); | |
82ba56c2 | 313 | synchronize_rcu(); |
6addb1d6 DT |
314 | } |
315 | ||
316 | static int evdev_open_device(struct evdev *evdev) | |
317 | { | |
318 | int retval; | |
319 | ||
320 | retval = mutex_lock_interruptible(&evdev->mutex); | |
321 | if (retval) | |
322 | return retval; | |
323 | ||
324 | if (!evdev->exist) | |
325 | retval = -ENODEV; | |
06445014 | 326 | else if (!evdev->open++) { |
6addb1d6 | 327 | retval = input_open_device(&evdev->handle); |
06445014 ON |
328 | if (retval) |
329 | evdev->open--; | |
330 | } | |
6addb1d6 DT |
331 | |
332 | mutex_unlock(&evdev->mutex); | |
333 | return retval; | |
334 | } | |
335 | ||
336 | static void evdev_close_device(struct evdev *evdev) | |
337 | { | |
338 | mutex_lock(&evdev->mutex); | |
339 | ||
340 | if (evdev->exist && !--evdev->open) | |
341 | input_close_device(&evdev->handle); | |
342 | ||
343 | mutex_unlock(&evdev->mutex); | |
344 | } | |
345 | ||
346 | /* | |
347 | * Wake up users waiting for IO so they can disconnect from | |
348 | * dead device. | |
349 | */ | |
350 | static void evdev_hangup(struct evdev *evdev) | |
351 | { | |
352 | struct evdev_client *client; | |
353 | ||
354 | spin_lock(&evdev->client_lock); | |
355 | list_for_each_entry(client, &evdev->client_list, node) | |
356 | kill_fasync(&client->fasync, SIGIO, POLL_HUP); | |
357 | spin_unlock(&evdev->client_lock); | |
358 | ||
359 | wake_up_interruptible(&evdev->wait); | |
360 | } | |
361 | ||
d0ffb9be | 362 | static int evdev_release(struct inode *inode, struct file *file) |
1da177e4 | 363 | { |
d0ffb9be DT |
364 | struct evdev_client *client = file->private_data; |
365 | struct evdev *evdev = client->evdev; | |
1da177e4 | 366 | |
6addb1d6 | 367 | mutex_lock(&evdev->mutex); |
dba42580 | 368 | evdev_ungrab(evdev, client); |
6addb1d6 | 369 | mutex_unlock(&evdev->mutex); |
1da177e4 | 370 | |
6addb1d6 | 371 | evdev_detach_client(evdev, client); |
d0ffb9be | 372 | kfree(client); |
1da177e4 | 373 | |
6addb1d6 | 374 | evdev_close_device(evdev); |
1da177e4 | 375 | |
1da177e4 LT |
376 | return 0; |
377 | } | |
378 | ||
b58f7086 HR |
379 | static unsigned int evdev_compute_buffer_size(struct input_dev *dev) |
380 | { | |
63a6404d HR |
381 | unsigned int n_events = |
382 | max(dev->hint_events_per_packet * EVDEV_BUF_PACKETS, | |
383 | EVDEV_MIN_BUFFER_SIZE); | |
384 | ||
385 | return roundup_pow_of_two(n_events); | |
b58f7086 HR |
386 | } |
387 | ||
d0ffb9be | 388 | static int evdev_open(struct inode *inode, struct file *file) |
1da177e4 | 389 | { |
7f8d4cad DT |
390 | struct evdev *evdev = container_of(inode->i_cdev, struct evdev, cdev); |
391 | unsigned int bufsize = evdev_compute_buffer_size(evdev->handle.dev); | |
6addb1d6 | 392 | struct evdev_client *client; |
d542ed82 | 393 | int error; |
1da177e4 | 394 | |
b58f7086 HR |
395 | client = kzalloc(sizeof(struct evdev_client) + |
396 | bufsize * sizeof(struct input_event), | |
397 | GFP_KERNEL); | |
7f8d4cad DT |
398 | if (!client) |
399 | return -ENOMEM; | |
1da177e4 | 400 | |
b58f7086 | 401 | client->bufsize = bufsize; |
6addb1d6 | 402 | spin_lock_init(&client->buffer_lock); |
d0ffb9be | 403 | client->evdev = evdev; |
6addb1d6 | 404 | evdev_attach_client(evdev, client); |
1da177e4 | 405 | |
6addb1d6 DT |
406 | error = evdev_open_device(evdev); |
407 | if (error) | |
408 | goto err_free_client; | |
1da177e4 | 409 | |
d0ffb9be | 410 | file->private_data = client; |
3d7bbd45 DT |
411 | nonseekable_open(inode, file); |
412 | ||
1da177e4 | 413 | return 0; |
9657d75c DT |
414 | |
415 | err_free_client: | |
6addb1d6 | 416 | evdev_detach_client(evdev, client); |
9657d75c | 417 | kfree(client); |
9657d75c | 418 | return error; |
1da177e4 LT |
419 | } |
420 | ||
6addb1d6 DT |
421 | static ssize_t evdev_write(struct file *file, const char __user *buffer, |
422 | size_t count, loff_t *ppos) | |
3a51f7c4 | 423 | { |
d0ffb9be DT |
424 | struct evdev_client *client = file->private_data; |
425 | struct evdev *evdev = client->evdev; | |
3a51f7c4 | 426 | struct input_event event; |
02dfc496 | 427 | int retval = 0; |
52658bb6 | 428 | |
2872a9b5 | 429 | if (count != 0 && count < input_event_size()) |
439581ec PK |
430 | return -EINVAL; |
431 | ||
6addb1d6 DT |
432 | retval = mutex_lock_interruptible(&evdev->mutex); |
433 | if (retval) | |
434 | return retval; | |
435 | ||
c7dc6573 | 436 | if (!evdev->exist || client->revoked) { |
6addb1d6 DT |
437 | retval = -ENODEV; |
438 | goto out; | |
439 | } | |
52658bb6 | 440 | |
2872a9b5 DT |
441 | while (retval + input_event_size() <= count) { |
442 | ||
2d56f3a3 | 443 | if (input_event_from_user(buffer + retval, &event)) { |
6addb1d6 DT |
444 | retval = -EFAULT; |
445 | goto out; | |
446 | } | |
439581ec | 447 | retval += input_event_size(); |
6addb1d6 DT |
448 | |
449 | input_inject_event(&evdev->handle, | |
450 | event.type, event.code, event.value); | |
2872a9b5 | 451 | } |
52658bb6 | 452 | |
6addb1d6 DT |
453 | out: |
454 | mutex_unlock(&evdev->mutex); | |
52658bb6 JK |
455 | return retval; |
456 | } | |
52658bb6 | 457 | |
6addb1d6 DT |
458 | static int evdev_fetch_next_event(struct evdev_client *client, |
459 | struct input_event *event) | |
460 | { | |
461 | int have_event; | |
462 | ||
463 | spin_lock_irq(&client->buffer_lock); | |
464 | ||
566cf5b6 | 465 | have_event = client->packet_head != client->tail; |
6addb1d6 DT |
466 | if (have_event) { |
467 | *event = client->buffer[client->tail++]; | |
b58f7086 | 468 | client->tail &= client->bufsize - 1; |
6addb1d6 DT |
469 | } |
470 | ||
471 | spin_unlock_irq(&client->buffer_lock); | |
472 | ||
473 | return have_event; | |
474 | } | |
475 | ||
476 | static ssize_t evdev_read(struct file *file, char __user *buffer, | |
477 | size_t count, loff_t *ppos) | |
1da177e4 | 478 | { |
d0ffb9be DT |
479 | struct evdev_client *client = file->private_data; |
480 | struct evdev *evdev = client->evdev; | |
6addb1d6 | 481 | struct input_event event; |
2872a9b5 DT |
482 | size_t read = 0; |
483 | int error; | |
1da177e4 | 484 | |
2872a9b5 | 485 | if (count != 0 && count < input_event_size()) |
1da177e4 LT |
486 | return -EINVAL; |
487 | ||
2872a9b5 | 488 | for (;;) { |
c7dc6573 | 489 | if (!evdev->exist || client->revoked) |
2872a9b5 | 490 | return -ENODEV; |
1da177e4 | 491 | |
2872a9b5 DT |
492 | if (client->packet_head == client->tail && |
493 | (file->f_flags & O_NONBLOCK)) | |
494 | return -EAGAIN; | |
495 | ||
496 | /* | |
497 | * count == 0 is special - no IO is done but we check | |
498 | * for error conditions (see above). | |
499 | */ | |
500 | if (count == 0) | |
501 | break; | |
1da177e4 | 502 | |
2872a9b5 DT |
503 | while (read + input_event_size() <= count && |
504 | evdev_fetch_next_event(client, &event)) { | |
3a51f7c4 | 505 | |
2872a9b5 DT |
506 | if (input_event_to_user(buffer + read, &event)) |
507 | return -EFAULT; | |
3a51f7c4 | 508 | |
2872a9b5 DT |
509 | read += input_event_size(); |
510 | } | |
1da177e4 | 511 | |
2872a9b5 DT |
512 | if (read) |
513 | break; | |
e90f869c | 514 | |
2872a9b5 DT |
515 | if (!(file->f_flags & O_NONBLOCK)) { |
516 | error = wait_event_interruptible(evdev->wait, | |
517 | client->packet_head != client->tail || | |
c7dc6573 | 518 | !evdev->exist || client->revoked); |
2872a9b5 DT |
519 | if (error) |
520 | return error; | |
521 | } | |
522 | } | |
523 | ||
524 | return read; | |
1da177e4 LT |
525 | } |
526 | ||
527 | /* No kernel lock - fine */ | |
528 | static unsigned int evdev_poll(struct file *file, poll_table *wait) | |
529 | { | |
d0ffb9be DT |
530 | struct evdev_client *client = file->private_data; |
531 | struct evdev *evdev = client->evdev; | |
c18fb139 | 532 | unsigned int mask; |
1e0afb28 | 533 | |
d0ffb9be | 534 | poll_wait(file, &evdev->wait, wait); |
c18fb139 | 535 | |
c7dc6573 DH |
536 | if (evdev->exist && !client->revoked) |
537 | mask = POLLOUT | POLLWRNORM; | |
538 | else | |
539 | mask = POLLHUP | POLLERR; | |
540 | ||
cdda911c | 541 | if (client->packet_head != client->tail) |
c18fb139 DT |
542 | mask |= POLLIN | POLLRDNORM; |
543 | ||
544 | return mask; | |
1da177e4 LT |
545 | } |
546 | ||
3a51f7c4 DT |
547 | #ifdef CONFIG_COMPAT |
548 | ||
549 | #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) | |
7b19ada2 | 550 | #define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1) |
3a51f7c4 DT |
551 | |
552 | #ifdef __BIG_ENDIAN | |
553 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
554 | unsigned int maxlen, void __user *p, int compat) | |
555 | { | |
556 | int len, i; | |
557 | ||
558 | if (compat) { | |
7b19ada2 | 559 | len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t); |
bf61f8d3 | 560 | if (len > maxlen) |
3a51f7c4 DT |
561 | len = maxlen; |
562 | ||
563 | for (i = 0; i < len / sizeof(compat_long_t); i++) | |
564 | if (copy_to_user((compat_long_t __user *) p + i, | |
565 | (compat_long_t *) bits + | |
566 | i + 1 - ((i % 2) << 1), | |
567 | sizeof(compat_long_t))) | |
568 | return -EFAULT; | |
569 | } else { | |
7b19ada2 | 570 | len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
571 | if (len > maxlen) |
572 | len = maxlen; | |
573 | ||
574 | if (copy_to_user(p, bits, len)) | |
575 | return -EFAULT; | |
576 | } | |
577 | ||
578 | return len; | |
579 | } | |
580 | #else | |
581 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
582 | unsigned int maxlen, void __user *p, int compat) | |
583 | { | |
584 | int len = compat ? | |
7b19ada2 JS |
585 | BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) : |
586 | BITS_TO_LONGS(maxbit) * sizeof(long); | |
3a51f7c4 DT |
587 | |
588 | if (len > maxlen) | |
589 | len = maxlen; | |
590 | ||
591 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
592 | } | |
593 | #endif /* __BIG_ENDIAN */ | |
594 | ||
595 | #else | |
596 | ||
597 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
598 | unsigned int maxlen, void __user *p, int compat) | |
599 | { | |
7b19ada2 | 600 | int len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
601 | |
602 | if (len > maxlen) | |
603 | len = maxlen; | |
604 | ||
605 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
606 | } | |
607 | ||
608 | #endif /* CONFIG_COMPAT */ | |
609 | ||
610 | static int str_to_user(const char *str, unsigned int maxlen, void __user *p) | |
611 | { | |
612 | int len; | |
613 | ||
614 | if (!str) | |
615 | return -ENOENT; | |
616 | ||
617 | len = strlen(str) + 1; | |
618 | if (len > maxlen) | |
619 | len = maxlen; | |
620 | ||
621 | return copy_to_user(p, str, len) ? -EFAULT : len; | |
622 | } | |
623 | ||
f2afa771 | 624 | #define OLD_KEY_MAX 0x1ff |
448cd166 DT |
625 | static int handle_eviocgbit(struct input_dev *dev, |
626 | unsigned int type, unsigned int size, | |
627 | void __user *p, int compat_mode) | |
5402a734 | 628 | { |
f2afa771 | 629 | static unsigned long keymax_warn_time; |
5402a734 LT |
630 | unsigned long *bits; |
631 | int len; | |
632 | ||
448cd166 | 633 | switch (type) { |
5402a734 LT |
634 | |
635 | case 0: bits = dev->evbit; len = EV_MAX; break; | |
636 | case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; | |
637 | case EV_REL: bits = dev->relbit; len = REL_MAX; break; | |
638 | case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; | |
639 | case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; | |
640 | case EV_LED: bits = dev->ledbit; len = LED_MAX; break; | |
641 | case EV_SND: bits = dev->sndbit; len = SND_MAX; break; | |
642 | case EV_FF: bits = dev->ffbit; len = FF_MAX; break; | |
643 | case EV_SW: bits = dev->swbit; len = SW_MAX; break; | |
644 | default: return -EINVAL; | |
645 | } | |
f2afa771 DT |
646 | |
647 | /* | |
648 | * Work around bugs in userspace programs that like to do | |
649 | * EVIOCGBIT(EV_KEY, KEY_MAX) and not realize that 'len' | |
650 | * should be in bytes, not in bits. | |
651 | */ | |
448cd166 | 652 | if (type == EV_KEY && size == OLD_KEY_MAX) { |
f2afa771 DT |
653 | len = OLD_KEY_MAX; |
654 | if (printk_timed_ratelimit(&keymax_warn_time, 10 * 1000)) | |
da0c4901 JP |
655 | pr_warning("(EVIOCGBIT): Suspicious buffer size %u, " |
656 | "limiting output to %zu bytes. See " | |
657 | "http://userweb.kernel.org/~dtor/eviocgbit-bug.html\n", | |
658 | OLD_KEY_MAX, | |
659 | BITS_TO_LONGS(OLD_KEY_MAX) * sizeof(long)); | |
f2afa771 DT |
660 | } |
661 | ||
448cd166 | 662 | return bits_to_user(bits, len, size, p, compat_mode); |
5402a734 | 663 | } |
f2afa771 | 664 | #undef OLD_KEY_MAX |
5402a734 | 665 | |
ab4e0192 | 666 | static int evdev_handle_get_keycode(struct input_dev *dev, void __user *p) |
8613e4c2 | 667 | { |
ab4e0192 DT |
668 | struct input_keymap_entry ke = { |
669 | .len = sizeof(unsigned int), | |
670 | .flags = 0, | |
671 | }; | |
672 | int __user *ip = (int __user *)p; | |
8613e4c2 MCC |
673 | int error; |
674 | ||
ab4e0192 DT |
675 | /* legacy case */ |
676 | if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) | |
677 | return -EFAULT; | |
8613e4c2 | 678 | |
ab4e0192 DT |
679 | error = input_get_keycode(dev, &ke); |
680 | if (error) | |
681 | return error; | |
8613e4c2 | 682 | |
ab4e0192 DT |
683 | if (put_user(ke.keycode, ip + 1)) |
684 | return -EFAULT; | |
8613e4c2 | 685 | |
ab4e0192 DT |
686 | return 0; |
687 | } | |
8613e4c2 | 688 | |
ab4e0192 DT |
689 | static int evdev_handle_get_keycode_v2(struct input_dev *dev, void __user *p) |
690 | { | |
691 | struct input_keymap_entry ke; | |
692 | int error; | |
8613e4c2 | 693 | |
ab4e0192 DT |
694 | if (copy_from_user(&ke, p, sizeof(ke))) |
695 | return -EFAULT; | |
8613e4c2 | 696 | |
ab4e0192 DT |
697 | error = input_get_keycode(dev, &ke); |
698 | if (error) | |
699 | return error; | |
8613e4c2 | 700 | |
ab4e0192 DT |
701 | if (copy_to_user(p, &ke, sizeof(ke))) |
702 | return -EFAULT; | |
8613e4c2 | 703 | |
8613e4c2 MCC |
704 | return 0; |
705 | } | |
706 | ||
ab4e0192 | 707 | static int evdev_handle_set_keycode(struct input_dev *dev, void __user *p) |
8613e4c2 | 708 | { |
ab4e0192 DT |
709 | struct input_keymap_entry ke = { |
710 | .len = sizeof(unsigned int), | |
711 | .flags = 0, | |
712 | }; | |
713 | int __user *ip = (int __user *)p; | |
8613e4c2 | 714 | |
ab4e0192 DT |
715 | if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) |
716 | return -EFAULT; | |
8613e4c2 | 717 | |
ab4e0192 DT |
718 | if (get_user(ke.keycode, ip + 1)) |
719 | return -EFAULT; | |
8613e4c2 | 720 | |
ab4e0192 DT |
721 | return input_set_keycode(dev, &ke); |
722 | } | |
8613e4c2 | 723 | |
ab4e0192 DT |
724 | static int evdev_handle_set_keycode_v2(struct input_dev *dev, void __user *p) |
725 | { | |
726 | struct input_keymap_entry ke; | |
8613e4c2 | 727 | |
ab4e0192 DT |
728 | if (copy_from_user(&ke, p, sizeof(ke))) |
729 | return -EFAULT; | |
8613e4c2 | 730 | |
ab4e0192 DT |
731 | if (ke.len > sizeof(ke.scancode)) |
732 | return -EINVAL; | |
8613e4c2 MCC |
733 | |
734 | return input_set_keycode(dev, &ke); | |
735 | } | |
736 | ||
48318028 DH |
737 | /* |
738 | * If we transfer state to the user, we should flush all pending events | |
739 | * of the same type from the client's queue. Otherwise, they might end up | |
740 | * with duplicate events, which can screw up client's state tracking. | |
741 | * If bits_to_user fails after flushing the queue, we queue a SYN_DROPPED | |
742 | * event so user-space will notice missing events. | |
743 | * | |
744 | * LOCKING: | |
745 | * We need to take event_lock before buffer_lock to avoid dead-locks. But we | |
746 | * need the even_lock only to guarantee consistent state. We can safely release | |
747 | * it while flushing the queue. This allows input-core to handle filters while | |
748 | * we flush the queue. | |
749 | */ | |
750 | static int evdev_handle_get_val(struct evdev_client *client, | |
751 | struct input_dev *dev, unsigned int type, | |
752 | unsigned long *bits, unsigned int max, | |
753 | unsigned int size, void __user *p, int compat) | |
754 | { | |
755 | int ret; | |
756 | unsigned long *mem; | |
757 | ||
758 | mem = kmalloc(sizeof(unsigned long) * max, GFP_KERNEL); | |
759 | if (!mem) | |
760 | return -ENOMEM; | |
761 | ||
762 | spin_lock_irq(&dev->event_lock); | |
763 | spin_lock(&client->buffer_lock); | |
764 | ||
765 | memcpy(mem, bits, sizeof(unsigned long) * max); | |
766 | ||
767 | spin_unlock(&dev->event_lock); | |
768 | ||
769 | __evdev_flush_queue(client, type); | |
770 | ||
771 | spin_unlock_irq(&client->buffer_lock); | |
772 | ||
773 | ret = bits_to_user(mem, max, size, p, compat); | |
774 | if (ret < 0) | |
775 | evdev_queue_syn_dropped(client); | |
776 | ||
777 | kfree(mem); | |
778 | ||
779 | return ret; | |
780 | } | |
781 | ||
1cf0c6e6 HR |
782 | static int evdev_handle_mt_request(struct input_dev *dev, |
783 | unsigned int size, | |
784 | int __user *ip) | |
785 | { | |
8d18fba2 | 786 | const struct input_mt *mt = dev->mt; |
1cf0c6e6 HR |
787 | unsigned int code; |
788 | int max_slots; | |
789 | int i; | |
790 | ||
791 | if (get_user(code, &ip[0])) | |
792 | return -EFAULT; | |
8d18fba2 | 793 | if (!mt || !input_is_mt_value(code)) |
1cf0c6e6 HR |
794 | return -EINVAL; |
795 | ||
796 | max_slots = (size - sizeof(__u32)) / sizeof(__s32); | |
8d18fba2 HR |
797 | for (i = 0; i < mt->num_slots && i < max_slots; i++) { |
798 | int value = input_mt_get_value(&mt->slots[i], code); | |
799 | if (put_user(value, &ip[1 + i])) | |
1cf0c6e6 | 800 | return -EFAULT; |
8d18fba2 | 801 | } |
1cf0c6e6 HR |
802 | |
803 | return 0; | |
804 | } | |
805 | ||
c7dc6573 DH |
806 | static int evdev_revoke(struct evdev *evdev, struct evdev_client *client, |
807 | struct file *file) | |
808 | { | |
809 | client->revoked = true; | |
810 | evdev_ungrab(evdev, client); | |
811 | input_flush_device(&evdev->handle, file); | |
812 | wake_up_interruptible(&evdev->wait); | |
813 | ||
814 | return 0; | |
815 | } | |
816 | ||
6addb1d6 DT |
817 | static long evdev_do_ioctl(struct file *file, unsigned int cmd, |
818 | void __user *p, int compat_mode) | |
1da177e4 | 819 | { |
d0ffb9be DT |
820 | struct evdev_client *client = file->private_data; |
821 | struct evdev *evdev = client->evdev; | |
1da177e4 LT |
822 | struct input_dev *dev = evdev->handle.dev; |
823 | struct input_absinfo abs; | |
509ca1a9 | 824 | struct ff_effect effect; |
3a51f7c4 | 825 | int __user *ip = (int __user *)p; |
58b93995 | 826 | unsigned int i, t, u, v; |
448cd166 | 827 | unsigned int size; |
509ca1a9 | 828 | int error; |
1da177e4 | 829 | |
448cd166 | 830 | /* First we check for fixed-length commands */ |
1da177e4 LT |
831 | switch (cmd) { |
832 | ||
6addb1d6 DT |
833 | case EVIOCGVERSION: |
834 | return put_user(EV_VERSION, ip); | |
1da177e4 | 835 | |
6addb1d6 DT |
836 | case EVIOCGID: |
837 | if (copy_to_user(p, &dev->id, sizeof(struct input_id))) | |
838 | return -EFAULT; | |
839 | return 0; | |
08791e5c | 840 | |
6addb1d6 DT |
841 | case EVIOCGREP: |
842 | if (!test_bit(EV_REP, dev->evbit)) | |
843 | return -ENOSYS; | |
844 | if (put_user(dev->rep[REP_DELAY], ip)) | |
845 | return -EFAULT; | |
846 | if (put_user(dev->rep[REP_PERIOD], ip + 1)) | |
847 | return -EFAULT; | |
848 | return 0; | |
08791e5c | 849 | |
6addb1d6 DT |
850 | case EVIOCSREP: |
851 | if (!test_bit(EV_REP, dev->evbit)) | |
852 | return -ENOSYS; | |
853 | if (get_user(u, ip)) | |
854 | return -EFAULT; | |
855 | if (get_user(v, ip + 1)) | |
856 | return -EFAULT; | |
08791e5c | 857 | |
6addb1d6 DT |
858 | input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u); |
859 | input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v); | |
3a51f7c4 | 860 | |
6addb1d6 | 861 | return 0; |
1da177e4 | 862 | |
6addb1d6 DT |
863 | case EVIOCRMFF: |
864 | return input_ff_erase(dev, (int)(unsigned long) p, file); | |
1da177e4 | 865 | |
6addb1d6 DT |
866 | case EVIOCGEFFECTS: |
867 | i = test_bit(EV_FF, dev->evbit) ? | |
868 | dev->ff->max_effects : 0; | |
869 | if (put_user(i, ip)) | |
870 | return -EFAULT; | |
871 | return 0; | |
872 | ||
873 | case EVIOCGRAB: | |
874 | if (p) | |
875 | return evdev_grab(evdev, client); | |
876 | else | |
877 | return evdev_ungrab(evdev, client); | |
ab4e0192 | 878 | |
c7dc6573 DH |
879 | case EVIOCREVOKE: |
880 | if (p) | |
881 | return -EINVAL; | |
882 | else | |
883 | return evdev_revoke(evdev, client, file); | |
884 | ||
a80b83b7 JS |
885 | case EVIOCSCLOCKID: |
886 | if (copy_from_user(&i, p, sizeof(unsigned int))) | |
887 | return -EFAULT; | |
888 | if (i != CLOCK_MONOTONIC && i != CLOCK_REALTIME) | |
889 | return -EINVAL; | |
890 | client->clkid = i; | |
891 | return 0; | |
892 | ||
ab4e0192 DT |
893 | case EVIOCGKEYCODE: |
894 | return evdev_handle_get_keycode(dev, p); | |
895 | ||
896 | case EVIOCSKEYCODE: | |
897 | return evdev_handle_set_keycode(dev, p); | |
898 | ||
899 | case EVIOCGKEYCODE_V2: | |
900 | return evdev_handle_get_keycode_v2(dev, p); | |
901 | ||
902 | case EVIOCSKEYCODE_V2: | |
903 | return evdev_handle_set_keycode_v2(dev, p); | |
448cd166 | 904 | } |
1da177e4 | 905 | |
448cd166 | 906 | size = _IOC_SIZE(cmd); |
1da177e4 | 907 | |
448cd166 DT |
908 | /* Now check variable-length commands */ |
909 | #define EVIOC_MASK_SIZE(nr) ((nr) & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) | |
448cd166 | 910 | switch (EVIOC_MASK_SIZE(cmd)) { |
41e979f8 | 911 | |
85b77200 HR |
912 | case EVIOCGPROP(0): |
913 | return bits_to_user(dev->propbit, INPUT_PROP_MAX, | |
914 | size, p, compat_mode); | |
915 | ||
1cf0c6e6 HR |
916 | case EVIOCGMTSLOTS(0): |
917 | return evdev_handle_mt_request(dev, size, ip); | |
918 | ||
448cd166 | 919 | case EVIOCGKEY(0): |
48318028 DH |
920 | return evdev_handle_get_val(client, dev, EV_KEY, dev->key, |
921 | KEY_MAX, size, p, compat_mode); | |
1da177e4 | 922 | |
448cd166 | 923 | case EVIOCGLED(0): |
48318028 DH |
924 | return evdev_handle_get_val(client, dev, EV_LED, dev->led, |
925 | LED_MAX, size, p, compat_mode); | |
1da177e4 | 926 | |
448cd166 | 927 | case EVIOCGSND(0): |
48318028 DH |
928 | return evdev_handle_get_val(client, dev, EV_SND, dev->snd, |
929 | SND_MAX, size, p, compat_mode); | |
1da177e4 | 930 | |
448cd166 | 931 | case EVIOCGSW(0): |
48318028 DH |
932 | return evdev_handle_get_val(client, dev, EV_SW, dev->sw, |
933 | SW_MAX, size, p, compat_mode); | |
31581066 | 934 | |
448cd166 DT |
935 | case EVIOCGNAME(0): |
936 | return str_to_user(dev->name, size, p); | |
1da177e4 | 937 | |
448cd166 DT |
938 | case EVIOCGPHYS(0): |
939 | return str_to_user(dev->phys, size, p); | |
1da177e4 | 940 | |
448cd166 DT |
941 | case EVIOCGUNIQ(0): |
942 | return str_to_user(dev->uniq, size, p); | |
1da177e4 | 943 | |
448cd166 DT |
944 | case EVIOC_MASK_SIZE(EVIOCSFF): |
945 | if (input_ff_effect_from_user(p, size, &effect)) | |
946 | return -EFAULT; | |
1da177e4 | 947 | |
448cd166 | 948 | error = input_ff_upload(dev, &effect, file); |
1da177e4 | 949 | |
448cd166 DT |
950 | if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) |
951 | return -EFAULT; | |
41e979f8 | 952 | |
448cd166 DT |
953 | return error; |
954 | } | |
1da177e4 | 955 | |
448cd166 DT |
956 | /* Multi-number variable-length handlers */ |
957 | if (_IOC_TYPE(cmd) != 'E') | |
958 | return -EINVAL; | |
1da177e4 | 959 | |
448cd166 | 960 | if (_IOC_DIR(cmd) == _IOC_READ) { |
6addb1d6 | 961 | |
448cd166 DT |
962 | if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0))) |
963 | return handle_eviocgbit(dev, | |
964 | _IOC_NR(cmd) & EV_MAX, size, | |
965 | p, compat_mode); | |
1da177e4 | 966 | |
448cd166 | 967 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { |
f2278f31 | 968 | |
0a74a1df DM |
969 | if (!dev->absinfo) |
970 | return -EINVAL; | |
971 | ||
448cd166 DT |
972 | t = _IOC_NR(cmd) & ABS_MAX; |
973 | abs = dev->absinfo[t]; | |
f2278f31 | 974 | |
448cd166 DT |
975 | if (copy_to_user(p, &abs, min_t(size_t, |
976 | size, sizeof(struct input_absinfo)))) | |
977 | return -EFAULT; | |
f2278f31 | 978 | |
448cd166 DT |
979 | return 0; |
980 | } | |
981 | } | |
f2278f31 | 982 | |
f9ce6eb5 | 983 | if (_IOC_DIR(cmd) == _IOC_WRITE) { |
f2278f31 | 984 | |
448cd166 | 985 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { |
1da177e4 | 986 | |
0a74a1df DM |
987 | if (!dev->absinfo) |
988 | return -EINVAL; | |
989 | ||
448cd166 | 990 | t = _IOC_NR(cmd) & ABS_MAX; |
41e979f8 | 991 | |
448cd166 DT |
992 | if (copy_from_user(&abs, p, min_t(size_t, |
993 | size, sizeof(struct input_absinfo)))) | |
994 | return -EFAULT; | |
1da177e4 | 995 | |
448cd166 DT |
996 | if (size < sizeof(struct input_absinfo)) |
997 | abs.resolution = 0; | |
d31b2865 | 998 | |
448cd166 DT |
999 | /* We can't change number of reserved MT slots */ |
1000 | if (t == ABS_MT_SLOT) | |
1001 | return -EINVAL; | |
40d007e7 | 1002 | |
448cd166 DT |
1003 | /* |
1004 | * Take event lock to ensure that we are not | |
1005 | * changing device parameters in the middle | |
1006 | * of event. | |
1007 | */ | |
1008 | spin_lock_irq(&dev->event_lock); | |
1009 | dev->absinfo[t] = abs; | |
1010 | spin_unlock_irq(&dev->event_lock); | |
6addb1d6 | 1011 | |
448cd166 | 1012 | return 0; |
6addb1d6 | 1013 | } |
1da177e4 | 1014 | } |
448cd166 | 1015 | |
1da177e4 LT |
1016 | return -EINVAL; |
1017 | } | |
1da177e4 | 1018 | |
6addb1d6 DT |
1019 | static long evdev_ioctl_handler(struct file *file, unsigned int cmd, |
1020 | void __user *p, int compat_mode) | |
1021 | { | |
1022 | struct evdev_client *client = file->private_data; | |
1023 | struct evdev *evdev = client->evdev; | |
1024 | int retval; | |
1025 | ||
1026 | retval = mutex_lock_interruptible(&evdev->mutex); | |
1027 | if (retval) | |
1028 | return retval; | |
1029 | ||
c7dc6573 | 1030 | if (!evdev->exist || client->revoked) { |
6addb1d6 DT |
1031 | retval = -ENODEV; |
1032 | goto out; | |
1033 | } | |
1034 | ||
1035 | retval = evdev_do_ioctl(file, cmd, p, compat_mode); | |
1036 | ||
1037 | out: | |
1038 | mutex_unlock(&evdev->mutex); | |
1039 | return retval; | |
1040 | } | |
1041 | ||
3a51f7c4 DT |
1042 | static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1043 | { | |
1044 | return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0); | |
1045 | } | |
41e979f8 | 1046 | |
3a51f7c4 | 1047 | #ifdef CONFIG_COMPAT |
6addb1d6 DT |
1048 | static long evdev_ioctl_compat(struct file *file, |
1049 | unsigned int cmd, unsigned long arg) | |
52658bb6 | 1050 | { |
3a51f7c4 | 1051 | return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1); |
1da177e4 | 1052 | } |
52658bb6 | 1053 | #endif |
1da177e4 | 1054 | |
66e66118 | 1055 | static const struct file_operations evdev_fops = { |
6addb1d6 DT |
1056 | .owner = THIS_MODULE, |
1057 | .read = evdev_read, | |
1058 | .write = evdev_write, | |
1059 | .poll = evdev_poll, | |
1060 | .open = evdev_open, | |
1061 | .release = evdev_release, | |
1062 | .unlocked_ioctl = evdev_ioctl, | |
52658bb6 | 1063 | #ifdef CONFIG_COMPAT |
6addb1d6 | 1064 | .compat_ioctl = evdev_ioctl_compat, |
52658bb6 | 1065 | #endif |
6addb1d6 | 1066 | .fasync = evdev_fasync, |
6038f373 AB |
1067 | .flush = evdev_flush, |
1068 | .llseek = no_llseek, | |
1da177e4 LT |
1069 | }; |
1070 | ||
6addb1d6 DT |
1071 | /* |
1072 | * Mark device non-existent. This disables writes, ioctls and | |
1073 | * prevents new users from opening the device. Already posted | |
1074 | * blocking reads will stay, however new ones will fail. | |
1075 | */ | |
1076 | static void evdev_mark_dead(struct evdev *evdev) | |
1077 | { | |
1078 | mutex_lock(&evdev->mutex); | |
20da92de | 1079 | evdev->exist = false; |
6addb1d6 DT |
1080 | mutex_unlock(&evdev->mutex); |
1081 | } | |
1082 | ||
1083 | static void evdev_cleanup(struct evdev *evdev) | |
1084 | { | |
1085 | struct input_handle *handle = &evdev->handle; | |
1086 | ||
1087 | evdev_mark_dead(evdev); | |
1088 | evdev_hangup(evdev); | |
7f8d4cad DT |
1089 | |
1090 | cdev_del(&evdev->cdev); | |
6addb1d6 DT |
1091 | |
1092 | /* evdev is marked dead so no one else accesses evdev->open */ | |
1093 | if (evdev->open) { | |
1094 | input_flush_device(handle, NULL); | |
1095 | input_close_device(handle); | |
1096 | } | |
1097 | } | |
1098 | ||
1099 | /* | |
1100 | * Create new evdev device. Note that input core serializes calls | |
7f8d4cad | 1101 | * to connect and disconnect. |
6addb1d6 | 1102 | */ |
5b2a0826 DT |
1103 | static int evdev_connect(struct input_handler *handler, struct input_dev *dev, |
1104 | const struct input_device_id *id) | |
1da177e4 LT |
1105 | { |
1106 | struct evdev *evdev; | |
1107 | int minor; | |
7f8d4cad | 1108 | int dev_no; |
5b2a0826 | 1109 | int error; |
1da177e4 | 1110 | |
7f8d4cad DT |
1111 | minor = input_get_new_minor(EVDEV_MINOR_BASE, EVDEV_MINORS, true); |
1112 | if (minor < 0) { | |
1113 | error = minor; | |
1114 | pr_err("failed to reserve new minor: %d\n", error); | |
1115 | return error; | |
1da177e4 LT |
1116 | } |
1117 | ||
5b2a0826 | 1118 | evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL); |
7f8d4cad DT |
1119 | if (!evdev) { |
1120 | error = -ENOMEM; | |
1121 | goto err_free_minor; | |
1122 | } | |
1da177e4 | 1123 | |
d0ffb9be | 1124 | INIT_LIST_HEAD(&evdev->client_list); |
6addb1d6 DT |
1125 | spin_lock_init(&evdev->client_lock); |
1126 | mutex_init(&evdev->mutex); | |
1da177e4 | 1127 | init_waitqueue_head(&evdev->wait); |
20da92de | 1128 | evdev->exist = true; |
7f8d4cad DT |
1129 | |
1130 | dev_no = minor; | |
1131 | /* Normalize device number if it falls into legacy range */ | |
1132 | if (dev_no < EVDEV_MINOR_BASE + EVDEV_MINORS) | |
1133 | dev_no -= EVDEV_MINOR_BASE; | |
1134 | dev_set_name(&evdev->dev, "event%d", dev_no); | |
6addb1d6 | 1135 | |
a7097ff8 | 1136 | evdev->handle.dev = input_get_device(dev); |
3d5cb60e | 1137 | evdev->handle.name = dev_name(&evdev->dev); |
1da177e4 LT |
1138 | evdev->handle.handler = handler; |
1139 | evdev->handle.private = evdev; | |
1da177e4 | 1140 | |
7f8d4cad | 1141 | evdev->dev.devt = MKDEV(INPUT_MAJOR, minor); |
9657d75c DT |
1142 | evdev->dev.class = &input_class; |
1143 | evdev->dev.parent = &dev->dev; | |
9657d75c DT |
1144 | evdev->dev.release = evdev_free; |
1145 | device_initialize(&evdev->dev); | |
5b2a0826 | 1146 | |
6addb1d6 | 1147 | error = input_register_handle(&evdev->handle); |
5b2a0826 | 1148 | if (error) |
9657d75c | 1149 | goto err_free_evdev; |
5b2a0826 | 1150 | |
7f8d4cad | 1151 | cdev_init(&evdev->cdev, &evdev_fops); |
4a215aad | 1152 | evdev->cdev.kobj.parent = &evdev->dev.kobj; |
7f8d4cad | 1153 | error = cdev_add(&evdev->cdev, evdev->dev.devt, 1); |
6addb1d6 DT |
1154 | if (error) |
1155 | goto err_unregister_handle; | |
1156 | ||
1157 | error = device_add(&evdev->dev); | |
5b2a0826 | 1158 | if (error) |
6addb1d6 | 1159 | goto err_cleanup_evdev; |
1da177e4 | 1160 | |
5b2a0826 | 1161 | return 0; |
1da177e4 | 1162 | |
6addb1d6 DT |
1163 | err_cleanup_evdev: |
1164 | evdev_cleanup(evdev); | |
1165 | err_unregister_handle: | |
1166 | input_unregister_handle(&evdev->handle); | |
5b2a0826 | 1167 | err_free_evdev: |
9657d75c | 1168 | put_device(&evdev->dev); |
7f8d4cad DT |
1169 | err_free_minor: |
1170 | input_free_minor(minor); | |
5b2a0826 | 1171 | return error; |
1da177e4 LT |
1172 | } |
1173 | ||
1174 | static void evdev_disconnect(struct input_handle *handle) | |
1175 | { | |
1176 | struct evdev *evdev = handle->private; | |
1da177e4 | 1177 | |
9657d75c | 1178 | device_del(&evdev->dev); |
6addb1d6 | 1179 | evdev_cleanup(evdev); |
7f8d4cad | 1180 | input_free_minor(MINOR(evdev->dev.devt)); |
6addb1d6 | 1181 | input_unregister_handle(handle); |
9657d75c | 1182 | put_device(&evdev->dev); |
1da177e4 LT |
1183 | } |
1184 | ||
66e66118 | 1185 | static const struct input_device_id evdev_ids[] = { |
1da177e4 LT |
1186 | { .driver_info = 1 }, /* Matches all devices */ |
1187 | { }, /* Terminating zero entry */ | |
1188 | }; | |
1189 | ||
1190 | MODULE_DEVICE_TABLE(input, evdev_ids); | |
1191 | ||
1192 | static struct input_handler evdev_handler = { | |
6addb1d6 | 1193 | .event = evdev_event, |
a274ac15 | 1194 | .events = evdev_events, |
6addb1d6 DT |
1195 | .connect = evdev_connect, |
1196 | .disconnect = evdev_disconnect, | |
7f8d4cad | 1197 | .legacy_minors = true, |
6addb1d6 DT |
1198 | .minor = EVDEV_MINOR_BASE, |
1199 | .name = "evdev", | |
1200 | .id_table = evdev_ids, | |
1da177e4 LT |
1201 | }; |
1202 | ||
1203 | static int __init evdev_init(void) | |
1204 | { | |
4263cf0f | 1205 | return input_register_handler(&evdev_handler); |
1da177e4 LT |
1206 | } |
1207 | ||
1208 | static void __exit evdev_exit(void) | |
1209 | { | |
1210 | input_unregister_handler(&evdev_handler); | |
1211 | } | |
1212 | ||
1213 | module_init(evdev_init); | |
1214 | module_exit(evdev_exit); | |
1215 | ||
1216 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
1217 | MODULE_DESCRIPTION("Input driver event char devices"); | |
1218 | MODULE_LICENSE("GPL"); |