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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 | 20 | #include <linux/slab.h> |
92eb77d0 DS |
21 | #include <linux/vmalloc.h> |
22 | #include <linux/mm.h> | |
1da177e4 LT |
23 | #include <linux/module.h> |
24 | #include <linux/init.h> | |
1cf0c6e6 | 25 | #include <linux/input/mt.h> |
1da177e4 | 26 | #include <linux/major.h> |
1da177e4 | 27 | #include <linux/device.h> |
7f8d4cad | 28 | #include <linux/cdev.h> |
2d56f3a3 | 29 | #include "input-compat.h" |
1da177e4 LT |
30 | |
31 | struct evdev { | |
1da177e4 | 32 | int open; |
1da177e4 LT |
33 | struct input_handle handle; |
34 | wait_queue_head_t wait; | |
2be85279 | 35 | struct evdev_client __rcu *grab; |
d0ffb9be | 36 | struct list_head client_list; |
6addb1d6 DT |
37 | spinlock_t client_lock; /* protects client_list */ |
38 | struct mutex mutex; | |
9657d75c | 39 | struct device dev; |
7f8d4cad | 40 | struct cdev cdev; |
20da92de | 41 | bool exist; |
1da177e4 LT |
42 | }; |
43 | ||
d0ffb9be | 44 | struct evdev_client { |
9fb0f14e JB |
45 | unsigned int head; |
46 | unsigned int tail; | |
cdda911c | 47 | unsigned int packet_head; /* [future] position of the first element of next packet */ |
6addb1d6 | 48 | spinlock_t buffer_lock; /* protects access to buffer, head and tail */ |
1da177e4 LT |
49 | struct fasync_struct *fasync; |
50 | struct evdev *evdev; | |
51 | struct list_head node; | |
a80b83b7 | 52 | int clkid; |
c7dc6573 | 53 | bool revoked; |
9fb0f14e | 54 | unsigned int bufsize; |
b58f7086 | 55 | struct input_event buffer[]; |
1da177e4 LT |
56 | }; |
57 | ||
48318028 DH |
58 | /* flush queued events of type @type, caller must hold client->buffer_lock */ |
59 | static void __evdev_flush_queue(struct evdev_client *client, unsigned int type) | |
60 | { | |
61 | unsigned int i, head, num; | |
62 | unsigned int mask = client->bufsize - 1; | |
63 | bool is_report; | |
64 | struct input_event *ev; | |
65 | ||
66 | BUG_ON(type == EV_SYN); | |
67 | ||
68 | head = client->tail; | |
69 | client->packet_head = client->tail; | |
70 | ||
71 | /* init to 1 so a leading SYN_REPORT will not be dropped */ | |
72 | num = 1; | |
73 | ||
74 | for (i = client->tail; i != client->head; i = (i + 1) & mask) { | |
75 | ev = &client->buffer[i]; | |
76 | is_report = ev->type == EV_SYN && ev->code == SYN_REPORT; | |
77 | ||
78 | if (ev->type == type) { | |
79 | /* drop matched entry */ | |
80 | continue; | |
81 | } else if (is_report && !num) { | |
82 | /* drop empty SYN_REPORT groups */ | |
83 | continue; | |
84 | } else if (head != i) { | |
85 | /* move entry to fill the gap */ | |
86 | client->buffer[head].time = ev->time; | |
87 | client->buffer[head].type = ev->type; | |
88 | client->buffer[head].code = ev->code; | |
89 | client->buffer[head].value = ev->value; | |
90 | } | |
91 | ||
92 | num++; | |
93 | head = (head + 1) & mask; | |
94 | ||
95 | if (is_report) { | |
96 | num = 0; | |
97 | client->packet_head = head; | |
98 | } | |
99 | } | |
100 | ||
101 | client->head = head; | |
102 | } | |
103 | ||
104 | /* queue SYN_DROPPED event */ | |
105 | static void evdev_queue_syn_dropped(struct evdev_client *client) | |
106 | { | |
107 | unsigned long flags; | |
108 | struct input_event ev; | |
109 | ktime_t time; | |
110 | ||
111 | time = ktime_get(); | |
112 | if (client->clkid != CLOCK_MONOTONIC) | |
113 | time = ktime_sub(time, ktime_get_monotonic_offset()); | |
114 | ||
115 | ev.time = ktime_to_timeval(time); | |
116 | ev.type = EV_SYN; | |
117 | ev.code = SYN_DROPPED; | |
118 | ev.value = 0; | |
119 | ||
120 | spin_lock_irqsave(&client->buffer_lock, flags); | |
121 | ||
122 | client->buffer[client->head++] = ev; | |
123 | client->head &= client->bufsize - 1; | |
124 | ||
125 | if (unlikely(client->head == client->tail)) { | |
126 | /* drop queue but keep our SYN_DROPPED event */ | |
127 | client->tail = (client->head - 1) & (client->bufsize - 1); | |
128 | client->packet_head = client->tail; | |
129 | } | |
130 | ||
131 | spin_unlock_irqrestore(&client->buffer_lock, flags); | |
132 | } | |
133 | ||
a274ac15 HR |
134 | static void __pass_event(struct evdev_client *client, |
135 | const struct input_event *event) | |
6addb1d6 | 136 | { |
9fb0f14e JB |
137 | client->buffer[client->head++] = *event; |
138 | client->head &= client->bufsize - 1; | |
139 | ||
140 | if (unlikely(client->head == client->tail)) { | |
141 | /* | |
142 | * This effectively "drops" all unconsumed events, leaving | |
143 | * EV_SYN/SYN_DROPPED plus the newest event in the queue. | |
144 | */ | |
145 | client->tail = (client->head - 2) & (client->bufsize - 1); | |
146 | ||
147 | client->buffer[client->tail].time = event->time; | |
148 | client->buffer[client->tail].type = EV_SYN; | |
149 | client->buffer[client->tail].code = SYN_DROPPED; | |
150 | client->buffer[client->tail].value = 0; | |
9fb0f14e | 151 | |
cdda911c JB |
152 | client->packet_head = client->tail; |
153 | } | |
6addb1d6 | 154 | |
cdda911c JB |
155 | if (event->type == EV_SYN && event->code == SYN_REPORT) { |
156 | client->packet_head = client->head; | |
30a589fd | 157 | kill_fasync(&client->fasync, SIGIO, POLL_IN); |
cdda911c | 158 | } |
a274ac15 HR |
159 | } |
160 | ||
161 | static void evdev_pass_values(struct evdev_client *client, | |
162 | const struct input_value *vals, unsigned int count, | |
163 | ktime_t mono, ktime_t real) | |
164 | { | |
165 | struct evdev *evdev = client->evdev; | |
166 | const struct input_value *v; | |
167 | struct input_event event; | |
168 | bool wakeup = false; | |
169 | ||
c7dc6573 DH |
170 | if (client->revoked) |
171 | return; | |
172 | ||
a274ac15 HR |
173 | event.time = ktime_to_timeval(client->clkid == CLOCK_MONOTONIC ? |
174 | mono : real); | |
175 | ||
176 | /* Interrupts are disabled, just acquire the lock. */ | |
177 | spin_lock(&client->buffer_lock); | |
178 | ||
179 | for (v = vals; v != vals + count; v++) { | |
180 | event.type = v->type; | |
181 | event.code = v->code; | |
182 | event.value = v->value; | |
183 | __pass_event(client, &event); | |
184 | if (v->type == EV_SYN && v->code == SYN_REPORT) | |
185 | wakeup = true; | |
186 | } | |
cdda911c JB |
187 | |
188 | spin_unlock(&client->buffer_lock); | |
a274ac15 HR |
189 | |
190 | if (wakeup) | |
191 | wake_up_interruptible(&evdev->wait); | |
6addb1d6 DT |
192 | } |
193 | ||
194 | /* | |
a274ac15 | 195 | * Pass incoming events to all connected clients. |
6addb1d6 | 196 | */ |
a274ac15 HR |
197 | static void evdev_events(struct input_handle *handle, |
198 | const struct input_value *vals, unsigned int count) | |
1da177e4 LT |
199 | { |
200 | struct evdev *evdev = handle->private; | |
d0ffb9be | 201 | struct evdev_client *client; |
a80b83b7 JS |
202 | ktime_t time_mono, time_real; |
203 | ||
204 | time_mono = ktime_get(); | |
205 | time_real = ktime_sub(time_mono, ktime_get_monotonic_offset()); | |
1da177e4 | 206 | |
82ba56c2 DT |
207 | rcu_read_lock(); |
208 | ||
6addb1d6 | 209 | client = rcu_dereference(evdev->grab); |
a80b83b7 | 210 | |
6addb1d6 | 211 | if (client) |
a274ac15 | 212 | evdev_pass_values(client, vals, count, time_mono, time_real); |
6addb1d6 DT |
213 | else |
214 | list_for_each_entry_rcu(client, &evdev->client_list, node) | |
a274ac15 HR |
215 | evdev_pass_values(client, vals, count, |
216 | time_mono, time_real); | |
1da177e4 | 217 | |
82ba56c2 | 218 | rcu_read_unlock(); |
a274ac15 | 219 | } |
82ba56c2 | 220 | |
a274ac15 HR |
221 | /* |
222 | * Pass incoming event to all connected clients. | |
223 | */ | |
224 | static void evdev_event(struct input_handle *handle, | |
225 | unsigned int type, unsigned int code, int value) | |
226 | { | |
227 | struct input_value vals[] = { { type, code, value } }; | |
228 | ||
229 | evdev_events(handle, vals, 1); | |
1da177e4 LT |
230 | } |
231 | ||
232 | static int evdev_fasync(int fd, struct file *file, int on) | |
233 | { | |
d0ffb9be | 234 | struct evdev_client *client = file->private_data; |
1e0afb28 | 235 | |
60aa4924 | 236 | return fasync_helper(fd, file, on, &client->fasync); |
1da177e4 LT |
237 | } |
238 | ||
1e0afb28 | 239 | static int evdev_flush(struct file *file, fl_owner_t id) |
1da177e4 | 240 | { |
d0ffb9be DT |
241 | struct evdev_client *client = file->private_data; |
242 | struct evdev *evdev = client->evdev; | |
6addb1d6 DT |
243 | int retval; |
244 | ||
245 | retval = mutex_lock_interruptible(&evdev->mutex); | |
246 | if (retval) | |
247 | return retval; | |
1e0afb28 | 248 | |
c7dc6573 | 249 | if (!evdev->exist || client->revoked) |
6addb1d6 DT |
250 | retval = -ENODEV; |
251 | else | |
252 | retval = input_flush_device(&evdev->handle, file); | |
1e0afb28 | 253 | |
6addb1d6 DT |
254 | mutex_unlock(&evdev->mutex); |
255 | return retval; | |
1da177e4 LT |
256 | } |
257 | ||
9657d75c | 258 | static void evdev_free(struct device *dev) |
1da177e4 | 259 | { |
9657d75c DT |
260 | struct evdev *evdev = container_of(dev, struct evdev, dev); |
261 | ||
a7097ff8 | 262 | input_put_device(evdev->handle.dev); |
1da177e4 LT |
263 | kfree(evdev); |
264 | } | |
265 | ||
6addb1d6 DT |
266 | /* |
267 | * Grabs an event device (along with underlying input device). | |
268 | * This function is called with evdev->mutex taken. | |
269 | */ | |
270 | static int evdev_grab(struct evdev *evdev, struct evdev_client *client) | |
271 | { | |
272 | int error; | |
273 | ||
274 | if (evdev->grab) | |
275 | return -EBUSY; | |
276 | ||
277 | error = input_grab_device(&evdev->handle); | |
278 | if (error) | |
279 | return error; | |
280 | ||
281 | rcu_assign_pointer(evdev->grab, client); | |
6addb1d6 DT |
282 | |
283 | return 0; | |
284 | } | |
285 | ||
286 | static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client) | |
287 | { | |
dba42580 DT |
288 | struct evdev_client *grab = rcu_dereference_protected(evdev->grab, |
289 | lockdep_is_held(&evdev->mutex)); | |
290 | ||
291 | if (grab != client) | |
6addb1d6 DT |
292 | return -EINVAL; |
293 | ||
294 | rcu_assign_pointer(evdev->grab, NULL); | |
82ba56c2 | 295 | synchronize_rcu(); |
6addb1d6 DT |
296 | input_release_device(&evdev->handle); |
297 | ||
298 | return 0; | |
299 | } | |
300 | ||
301 | static void evdev_attach_client(struct evdev *evdev, | |
302 | struct evdev_client *client) | |
303 | { | |
304 | spin_lock(&evdev->client_lock); | |
305 | list_add_tail_rcu(&client->node, &evdev->client_list); | |
306 | spin_unlock(&evdev->client_lock); | |
6addb1d6 DT |
307 | } |
308 | ||
309 | static void evdev_detach_client(struct evdev *evdev, | |
310 | struct evdev_client *client) | |
311 | { | |
312 | spin_lock(&evdev->client_lock); | |
313 | list_del_rcu(&client->node); | |
314 | spin_unlock(&evdev->client_lock); | |
82ba56c2 | 315 | synchronize_rcu(); |
6addb1d6 DT |
316 | } |
317 | ||
318 | static int evdev_open_device(struct evdev *evdev) | |
319 | { | |
320 | int retval; | |
321 | ||
322 | retval = mutex_lock_interruptible(&evdev->mutex); | |
323 | if (retval) | |
324 | return retval; | |
325 | ||
326 | if (!evdev->exist) | |
327 | retval = -ENODEV; | |
06445014 | 328 | else if (!evdev->open++) { |
6addb1d6 | 329 | retval = input_open_device(&evdev->handle); |
06445014 ON |
330 | if (retval) |
331 | evdev->open--; | |
332 | } | |
6addb1d6 DT |
333 | |
334 | mutex_unlock(&evdev->mutex); | |
335 | return retval; | |
336 | } | |
337 | ||
338 | static void evdev_close_device(struct evdev *evdev) | |
339 | { | |
340 | mutex_lock(&evdev->mutex); | |
341 | ||
342 | if (evdev->exist && !--evdev->open) | |
343 | input_close_device(&evdev->handle); | |
344 | ||
345 | mutex_unlock(&evdev->mutex); | |
346 | } | |
347 | ||
348 | /* | |
349 | * Wake up users waiting for IO so they can disconnect from | |
350 | * dead device. | |
351 | */ | |
352 | static void evdev_hangup(struct evdev *evdev) | |
353 | { | |
354 | struct evdev_client *client; | |
355 | ||
356 | spin_lock(&evdev->client_lock); | |
357 | list_for_each_entry(client, &evdev->client_list, node) | |
358 | kill_fasync(&client->fasync, SIGIO, POLL_HUP); | |
359 | spin_unlock(&evdev->client_lock); | |
360 | ||
361 | wake_up_interruptible(&evdev->wait); | |
362 | } | |
363 | ||
d0ffb9be | 364 | static int evdev_release(struct inode *inode, struct file *file) |
1da177e4 | 365 | { |
d0ffb9be DT |
366 | struct evdev_client *client = file->private_data; |
367 | struct evdev *evdev = client->evdev; | |
1da177e4 | 368 | |
6addb1d6 | 369 | mutex_lock(&evdev->mutex); |
dba42580 | 370 | evdev_ungrab(evdev, client); |
6addb1d6 | 371 | mutex_unlock(&evdev->mutex); |
1da177e4 | 372 | |
6addb1d6 | 373 | evdev_detach_client(evdev, client); |
92eb77d0 DS |
374 | |
375 | if (is_vmalloc_addr(client)) | |
376 | vfree(client); | |
377 | else | |
378 | kfree(client); | |
1da177e4 | 379 | |
6addb1d6 | 380 | evdev_close_device(evdev); |
1da177e4 | 381 | |
1da177e4 LT |
382 | return 0; |
383 | } | |
384 | ||
b58f7086 HR |
385 | static unsigned int evdev_compute_buffer_size(struct input_dev *dev) |
386 | { | |
63a6404d HR |
387 | unsigned int n_events = |
388 | max(dev->hint_events_per_packet * EVDEV_BUF_PACKETS, | |
389 | EVDEV_MIN_BUFFER_SIZE); | |
390 | ||
391 | return roundup_pow_of_two(n_events); | |
b58f7086 HR |
392 | } |
393 | ||
d0ffb9be | 394 | static int evdev_open(struct inode *inode, struct file *file) |
1da177e4 | 395 | { |
7f8d4cad DT |
396 | struct evdev *evdev = container_of(inode->i_cdev, struct evdev, cdev); |
397 | unsigned int bufsize = evdev_compute_buffer_size(evdev->handle.dev); | |
92eb77d0 DS |
398 | unsigned int size = sizeof(struct evdev_client) + |
399 | bufsize * sizeof(struct input_event); | |
6addb1d6 | 400 | struct evdev_client *client; |
d542ed82 | 401 | int error; |
1da177e4 | 402 | |
92eb77d0 DS |
403 | client = kzalloc(size, GFP_KERNEL | __GFP_NOWARN); |
404 | if (!client) | |
405 | client = vzalloc(size); | |
7f8d4cad DT |
406 | if (!client) |
407 | return -ENOMEM; | |
1da177e4 | 408 | |
b58f7086 | 409 | client->bufsize = bufsize; |
6addb1d6 | 410 | spin_lock_init(&client->buffer_lock); |
d0ffb9be | 411 | client->evdev = evdev; |
6addb1d6 | 412 | evdev_attach_client(evdev, client); |
1da177e4 | 413 | |
6addb1d6 DT |
414 | error = evdev_open_device(evdev); |
415 | if (error) | |
416 | goto err_free_client; | |
1da177e4 | 417 | |
d0ffb9be | 418 | file->private_data = client; |
3d7bbd45 DT |
419 | nonseekable_open(inode, file); |
420 | ||
1da177e4 | 421 | return 0; |
9657d75c DT |
422 | |
423 | err_free_client: | |
6addb1d6 | 424 | evdev_detach_client(evdev, client); |
9657d75c | 425 | kfree(client); |
9657d75c | 426 | return error; |
1da177e4 LT |
427 | } |
428 | ||
6addb1d6 DT |
429 | static ssize_t evdev_write(struct file *file, const char __user *buffer, |
430 | size_t count, loff_t *ppos) | |
3a51f7c4 | 431 | { |
d0ffb9be DT |
432 | struct evdev_client *client = file->private_data; |
433 | struct evdev *evdev = client->evdev; | |
3a51f7c4 | 434 | struct input_event event; |
02dfc496 | 435 | int retval = 0; |
52658bb6 | 436 | |
2872a9b5 | 437 | if (count != 0 && count < input_event_size()) |
439581ec PK |
438 | return -EINVAL; |
439 | ||
6addb1d6 DT |
440 | retval = mutex_lock_interruptible(&evdev->mutex); |
441 | if (retval) | |
442 | return retval; | |
443 | ||
c7dc6573 | 444 | if (!evdev->exist || client->revoked) { |
6addb1d6 DT |
445 | retval = -ENODEV; |
446 | goto out; | |
447 | } | |
52658bb6 | 448 | |
2872a9b5 DT |
449 | while (retval + input_event_size() <= count) { |
450 | ||
2d56f3a3 | 451 | if (input_event_from_user(buffer + retval, &event)) { |
6addb1d6 DT |
452 | retval = -EFAULT; |
453 | goto out; | |
454 | } | |
439581ec | 455 | retval += input_event_size(); |
6addb1d6 DT |
456 | |
457 | input_inject_event(&evdev->handle, | |
458 | event.type, event.code, event.value); | |
2872a9b5 | 459 | } |
52658bb6 | 460 | |
6addb1d6 DT |
461 | out: |
462 | mutex_unlock(&evdev->mutex); | |
52658bb6 JK |
463 | return retval; |
464 | } | |
52658bb6 | 465 | |
6addb1d6 DT |
466 | static int evdev_fetch_next_event(struct evdev_client *client, |
467 | struct input_event *event) | |
468 | { | |
469 | int have_event; | |
470 | ||
471 | spin_lock_irq(&client->buffer_lock); | |
472 | ||
566cf5b6 | 473 | have_event = client->packet_head != client->tail; |
6addb1d6 DT |
474 | if (have_event) { |
475 | *event = client->buffer[client->tail++]; | |
b58f7086 | 476 | client->tail &= client->bufsize - 1; |
6addb1d6 DT |
477 | } |
478 | ||
479 | spin_unlock_irq(&client->buffer_lock); | |
480 | ||
481 | return have_event; | |
482 | } | |
483 | ||
484 | static ssize_t evdev_read(struct file *file, char __user *buffer, | |
485 | size_t count, loff_t *ppos) | |
1da177e4 | 486 | { |
d0ffb9be DT |
487 | struct evdev_client *client = file->private_data; |
488 | struct evdev *evdev = client->evdev; | |
6addb1d6 | 489 | struct input_event event; |
2872a9b5 DT |
490 | size_t read = 0; |
491 | int error; | |
1da177e4 | 492 | |
2872a9b5 | 493 | if (count != 0 && count < input_event_size()) |
1da177e4 LT |
494 | return -EINVAL; |
495 | ||
2872a9b5 | 496 | for (;;) { |
c7dc6573 | 497 | if (!evdev->exist || client->revoked) |
2872a9b5 | 498 | return -ENODEV; |
1da177e4 | 499 | |
2872a9b5 DT |
500 | if (client->packet_head == client->tail && |
501 | (file->f_flags & O_NONBLOCK)) | |
502 | return -EAGAIN; | |
503 | ||
504 | /* | |
505 | * count == 0 is special - no IO is done but we check | |
506 | * for error conditions (see above). | |
507 | */ | |
508 | if (count == 0) | |
509 | break; | |
1da177e4 | 510 | |
2872a9b5 DT |
511 | while (read + input_event_size() <= count && |
512 | evdev_fetch_next_event(client, &event)) { | |
3a51f7c4 | 513 | |
2872a9b5 DT |
514 | if (input_event_to_user(buffer + read, &event)) |
515 | return -EFAULT; | |
3a51f7c4 | 516 | |
2872a9b5 DT |
517 | read += input_event_size(); |
518 | } | |
1da177e4 | 519 | |
2872a9b5 DT |
520 | if (read) |
521 | break; | |
e90f869c | 522 | |
2872a9b5 DT |
523 | if (!(file->f_flags & O_NONBLOCK)) { |
524 | error = wait_event_interruptible(evdev->wait, | |
525 | client->packet_head != client->tail || | |
c7dc6573 | 526 | !evdev->exist || client->revoked); |
2872a9b5 DT |
527 | if (error) |
528 | return error; | |
529 | } | |
530 | } | |
531 | ||
532 | return read; | |
1da177e4 LT |
533 | } |
534 | ||
535 | /* No kernel lock - fine */ | |
536 | static unsigned int evdev_poll(struct file *file, poll_table *wait) | |
537 | { | |
d0ffb9be DT |
538 | struct evdev_client *client = file->private_data; |
539 | struct evdev *evdev = client->evdev; | |
c18fb139 | 540 | unsigned int mask; |
1e0afb28 | 541 | |
d0ffb9be | 542 | poll_wait(file, &evdev->wait, wait); |
c18fb139 | 543 | |
c7dc6573 DH |
544 | if (evdev->exist && !client->revoked) |
545 | mask = POLLOUT | POLLWRNORM; | |
546 | else | |
547 | mask = POLLHUP | POLLERR; | |
548 | ||
cdda911c | 549 | if (client->packet_head != client->tail) |
c18fb139 DT |
550 | mask |= POLLIN | POLLRDNORM; |
551 | ||
552 | return mask; | |
1da177e4 LT |
553 | } |
554 | ||
3a51f7c4 DT |
555 | #ifdef CONFIG_COMPAT |
556 | ||
557 | #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) | |
7b19ada2 | 558 | #define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1) |
3a51f7c4 DT |
559 | |
560 | #ifdef __BIG_ENDIAN | |
561 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
562 | unsigned int maxlen, void __user *p, int compat) | |
563 | { | |
564 | int len, i; | |
565 | ||
566 | if (compat) { | |
7b19ada2 | 567 | len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t); |
bf61f8d3 | 568 | if (len > maxlen) |
3a51f7c4 DT |
569 | len = maxlen; |
570 | ||
571 | for (i = 0; i < len / sizeof(compat_long_t); i++) | |
572 | if (copy_to_user((compat_long_t __user *) p + i, | |
573 | (compat_long_t *) bits + | |
574 | i + 1 - ((i % 2) << 1), | |
575 | sizeof(compat_long_t))) | |
576 | return -EFAULT; | |
577 | } else { | |
7b19ada2 | 578 | len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
579 | if (len > maxlen) |
580 | len = maxlen; | |
581 | ||
582 | if (copy_to_user(p, bits, len)) | |
583 | return -EFAULT; | |
584 | } | |
585 | ||
586 | return len; | |
587 | } | |
588 | #else | |
589 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
590 | unsigned int maxlen, void __user *p, int compat) | |
591 | { | |
592 | int len = compat ? | |
7b19ada2 JS |
593 | BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) : |
594 | BITS_TO_LONGS(maxbit) * sizeof(long); | |
3a51f7c4 DT |
595 | |
596 | if (len > maxlen) | |
597 | len = maxlen; | |
598 | ||
599 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
600 | } | |
601 | #endif /* __BIG_ENDIAN */ | |
602 | ||
603 | #else | |
604 | ||
605 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
606 | unsigned int maxlen, void __user *p, int compat) | |
607 | { | |
7b19ada2 | 608 | int len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
609 | |
610 | if (len > maxlen) | |
611 | len = maxlen; | |
612 | ||
613 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
614 | } | |
615 | ||
616 | #endif /* CONFIG_COMPAT */ | |
617 | ||
618 | static int str_to_user(const char *str, unsigned int maxlen, void __user *p) | |
619 | { | |
620 | int len; | |
621 | ||
622 | if (!str) | |
623 | return -ENOENT; | |
624 | ||
625 | len = strlen(str) + 1; | |
626 | if (len > maxlen) | |
627 | len = maxlen; | |
628 | ||
629 | return copy_to_user(p, str, len) ? -EFAULT : len; | |
630 | } | |
631 | ||
f2afa771 | 632 | #define OLD_KEY_MAX 0x1ff |
448cd166 DT |
633 | static int handle_eviocgbit(struct input_dev *dev, |
634 | unsigned int type, unsigned int size, | |
635 | void __user *p, int compat_mode) | |
5402a734 | 636 | { |
f2afa771 | 637 | static unsigned long keymax_warn_time; |
5402a734 LT |
638 | unsigned long *bits; |
639 | int len; | |
640 | ||
448cd166 | 641 | switch (type) { |
5402a734 LT |
642 | |
643 | case 0: bits = dev->evbit; len = EV_MAX; break; | |
644 | case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; | |
645 | case EV_REL: bits = dev->relbit; len = REL_MAX; break; | |
646 | case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; | |
647 | case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; | |
648 | case EV_LED: bits = dev->ledbit; len = LED_MAX; break; | |
649 | case EV_SND: bits = dev->sndbit; len = SND_MAX; break; | |
650 | case EV_FF: bits = dev->ffbit; len = FF_MAX; break; | |
651 | case EV_SW: bits = dev->swbit; len = SW_MAX; break; | |
652 | default: return -EINVAL; | |
653 | } | |
f2afa771 DT |
654 | |
655 | /* | |
656 | * Work around bugs in userspace programs that like to do | |
657 | * EVIOCGBIT(EV_KEY, KEY_MAX) and not realize that 'len' | |
658 | * should be in bytes, not in bits. | |
659 | */ | |
448cd166 | 660 | if (type == EV_KEY && size == OLD_KEY_MAX) { |
f2afa771 DT |
661 | len = OLD_KEY_MAX; |
662 | if (printk_timed_ratelimit(&keymax_warn_time, 10 * 1000)) | |
da0c4901 JP |
663 | pr_warning("(EVIOCGBIT): Suspicious buffer size %u, " |
664 | "limiting output to %zu bytes. See " | |
665 | "http://userweb.kernel.org/~dtor/eviocgbit-bug.html\n", | |
666 | OLD_KEY_MAX, | |
667 | BITS_TO_LONGS(OLD_KEY_MAX) * sizeof(long)); | |
f2afa771 DT |
668 | } |
669 | ||
448cd166 | 670 | return bits_to_user(bits, len, size, p, compat_mode); |
5402a734 | 671 | } |
f2afa771 | 672 | #undef OLD_KEY_MAX |
5402a734 | 673 | |
ab4e0192 | 674 | static int evdev_handle_get_keycode(struct input_dev *dev, void __user *p) |
8613e4c2 | 675 | { |
ab4e0192 DT |
676 | struct input_keymap_entry ke = { |
677 | .len = sizeof(unsigned int), | |
678 | .flags = 0, | |
679 | }; | |
680 | int __user *ip = (int __user *)p; | |
8613e4c2 MCC |
681 | int error; |
682 | ||
ab4e0192 DT |
683 | /* legacy case */ |
684 | if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) | |
685 | return -EFAULT; | |
8613e4c2 | 686 | |
ab4e0192 DT |
687 | error = input_get_keycode(dev, &ke); |
688 | if (error) | |
689 | return error; | |
8613e4c2 | 690 | |
ab4e0192 DT |
691 | if (put_user(ke.keycode, ip + 1)) |
692 | return -EFAULT; | |
8613e4c2 | 693 | |
ab4e0192 DT |
694 | return 0; |
695 | } | |
8613e4c2 | 696 | |
ab4e0192 DT |
697 | static int evdev_handle_get_keycode_v2(struct input_dev *dev, void __user *p) |
698 | { | |
699 | struct input_keymap_entry ke; | |
700 | int error; | |
8613e4c2 | 701 | |
ab4e0192 DT |
702 | if (copy_from_user(&ke, p, sizeof(ke))) |
703 | return -EFAULT; | |
8613e4c2 | 704 | |
ab4e0192 DT |
705 | error = input_get_keycode(dev, &ke); |
706 | if (error) | |
707 | return error; | |
8613e4c2 | 708 | |
ab4e0192 DT |
709 | if (copy_to_user(p, &ke, sizeof(ke))) |
710 | return -EFAULT; | |
8613e4c2 | 711 | |
8613e4c2 MCC |
712 | return 0; |
713 | } | |
714 | ||
ab4e0192 | 715 | static int evdev_handle_set_keycode(struct input_dev *dev, void __user *p) |
8613e4c2 | 716 | { |
ab4e0192 DT |
717 | struct input_keymap_entry ke = { |
718 | .len = sizeof(unsigned int), | |
719 | .flags = 0, | |
720 | }; | |
721 | int __user *ip = (int __user *)p; | |
8613e4c2 | 722 | |
ab4e0192 DT |
723 | if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) |
724 | return -EFAULT; | |
8613e4c2 | 725 | |
ab4e0192 DT |
726 | if (get_user(ke.keycode, ip + 1)) |
727 | return -EFAULT; | |
8613e4c2 | 728 | |
ab4e0192 DT |
729 | return input_set_keycode(dev, &ke); |
730 | } | |
8613e4c2 | 731 | |
ab4e0192 DT |
732 | static int evdev_handle_set_keycode_v2(struct input_dev *dev, void __user *p) |
733 | { | |
734 | struct input_keymap_entry ke; | |
8613e4c2 | 735 | |
ab4e0192 DT |
736 | if (copy_from_user(&ke, p, sizeof(ke))) |
737 | return -EFAULT; | |
8613e4c2 | 738 | |
ab4e0192 DT |
739 | if (ke.len > sizeof(ke.scancode)) |
740 | return -EINVAL; | |
8613e4c2 MCC |
741 | |
742 | return input_set_keycode(dev, &ke); | |
743 | } | |
744 | ||
48318028 DH |
745 | /* |
746 | * If we transfer state to the user, we should flush all pending events | |
747 | * of the same type from the client's queue. Otherwise, they might end up | |
748 | * with duplicate events, which can screw up client's state tracking. | |
749 | * If bits_to_user fails after flushing the queue, we queue a SYN_DROPPED | |
750 | * event so user-space will notice missing events. | |
751 | * | |
752 | * LOCKING: | |
753 | * We need to take event_lock before buffer_lock to avoid dead-locks. But we | |
754 | * need the even_lock only to guarantee consistent state. We can safely release | |
755 | * it while flushing the queue. This allows input-core to handle filters while | |
756 | * we flush the queue. | |
757 | */ | |
758 | static int evdev_handle_get_val(struct evdev_client *client, | |
759 | struct input_dev *dev, unsigned int type, | |
760 | unsigned long *bits, unsigned int max, | |
761 | unsigned int size, void __user *p, int compat) | |
762 | { | |
763 | int ret; | |
764 | unsigned long *mem; | |
765 | ||
766 | mem = kmalloc(sizeof(unsigned long) * max, GFP_KERNEL); | |
767 | if (!mem) | |
768 | return -ENOMEM; | |
769 | ||
770 | spin_lock_irq(&dev->event_lock); | |
771 | spin_lock(&client->buffer_lock); | |
772 | ||
773 | memcpy(mem, bits, sizeof(unsigned long) * max); | |
774 | ||
775 | spin_unlock(&dev->event_lock); | |
776 | ||
777 | __evdev_flush_queue(client, type); | |
778 | ||
779 | spin_unlock_irq(&client->buffer_lock); | |
780 | ||
781 | ret = bits_to_user(mem, max, size, p, compat); | |
782 | if (ret < 0) | |
783 | evdev_queue_syn_dropped(client); | |
784 | ||
785 | kfree(mem); | |
786 | ||
787 | return ret; | |
788 | } | |
789 | ||
1cf0c6e6 HR |
790 | static int evdev_handle_mt_request(struct input_dev *dev, |
791 | unsigned int size, | |
792 | int __user *ip) | |
793 | { | |
8d18fba2 | 794 | const struct input_mt *mt = dev->mt; |
1cf0c6e6 HR |
795 | unsigned int code; |
796 | int max_slots; | |
797 | int i; | |
798 | ||
799 | if (get_user(code, &ip[0])) | |
800 | return -EFAULT; | |
8d18fba2 | 801 | if (!mt || !input_is_mt_value(code)) |
1cf0c6e6 HR |
802 | return -EINVAL; |
803 | ||
804 | max_slots = (size - sizeof(__u32)) / sizeof(__s32); | |
8d18fba2 HR |
805 | for (i = 0; i < mt->num_slots && i < max_slots; i++) { |
806 | int value = input_mt_get_value(&mt->slots[i], code); | |
807 | if (put_user(value, &ip[1 + i])) | |
1cf0c6e6 | 808 | return -EFAULT; |
8d18fba2 | 809 | } |
1cf0c6e6 HR |
810 | |
811 | return 0; | |
812 | } | |
813 | ||
c7dc6573 DH |
814 | static int evdev_revoke(struct evdev *evdev, struct evdev_client *client, |
815 | struct file *file) | |
816 | { | |
817 | client->revoked = true; | |
818 | evdev_ungrab(evdev, client); | |
819 | input_flush_device(&evdev->handle, file); | |
820 | wake_up_interruptible(&evdev->wait); | |
821 | ||
822 | return 0; | |
823 | } | |
824 | ||
6addb1d6 DT |
825 | static long evdev_do_ioctl(struct file *file, unsigned int cmd, |
826 | void __user *p, int compat_mode) | |
1da177e4 | 827 | { |
d0ffb9be DT |
828 | struct evdev_client *client = file->private_data; |
829 | struct evdev *evdev = client->evdev; | |
1da177e4 LT |
830 | struct input_dev *dev = evdev->handle.dev; |
831 | struct input_absinfo abs; | |
509ca1a9 | 832 | struct ff_effect effect; |
3a51f7c4 | 833 | int __user *ip = (int __user *)p; |
58b93995 | 834 | unsigned int i, t, u, v; |
448cd166 | 835 | unsigned int size; |
509ca1a9 | 836 | int error; |
1da177e4 | 837 | |
448cd166 | 838 | /* First we check for fixed-length commands */ |
1da177e4 LT |
839 | switch (cmd) { |
840 | ||
6addb1d6 DT |
841 | case EVIOCGVERSION: |
842 | return put_user(EV_VERSION, ip); | |
1da177e4 | 843 | |
6addb1d6 DT |
844 | case EVIOCGID: |
845 | if (copy_to_user(p, &dev->id, sizeof(struct input_id))) | |
846 | return -EFAULT; | |
847 | return 0; | |
08791e5c | 848 | |
6addb1d6 DT |
849 | case EVIOCGREP: |
850 | if (!test_bit(EV_REP, dev->evbit)) | |
851 | return -ENOSYS; | |
852 | if (put_user(dev->rep[REP_DELAY], ip)) | |
853 | return -EFAULT; | |
854 | if (put_user(dev->rep[REP_PERIOD], ip + 1)) | |
855 | return -EFAULT; | |
856 | return 0; | |
08791e5c | 857 | |
6addb1d6 DT |
858 | case EVIOCSREP: |
859 | if (!test_bit(EV_REP, dev->evbit)) | |
860 | return -ENOSYS; | |
861 | if (get_user(u, ip)) | |
862 | return -EFAULT; | |
863 | if (get_user(v, ip + 1)) | |
864 | return -EFAULT; | |
08791e5c | 865 | |
6addb1d6 DT |
866 | input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u); |
867 | input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v); | |
3a51f7c4 | 868 | |
6addb1d6 | 869 | return 0; |
1da177e4 | 870 | |
6addb1d6 DT |
871 | case EVIOCRMFF: |
872 | return input_ff_erase(dev, (int)(unsigned long) p, file); | |
1da177e4 | 873 | |
6addb1d6 DT |
874 | case EVIOCGEFFECTS: |
875 | i = test_bit(EV_FF, dev->evbit) ? | |
876 | dev->ff->max_effects : 0; | |
877 | if (put_user(i, ip)) | |
878 | return -EFAULT; | |
879 | return 0; | |
880 | ||
881 | case EVIOCGRAB: | |
882 | if (p) | |
883 | return evdev_grab(evdev, client); | |
884 | else | |
885 | return evdev_ungrab(evdev, client); | |
ab4e0192 | 886 | |
c7dc6573 DH |
887 | case EVIOCREVOKE: |
888 | if (p) | |
889 | return -EINVAL; | |
890 | else | |
891 | return evdev_revoke(evdev, client, file); | |
892 | ||
a80b83b7 JS |
893 | case EVIOCSCLOCKID: |
894 | if (copy_from_user(&i, p, sizeof(unsigned int))) | |
895 | return -EFAULT; | |
896 | if (i != CLOCK_MONOTONIC && i != CLOCK_REALTIME) | |
897 | return -EINVAL; | |
898 | client->clkid = i; | |
899 | return 0; | |
900 | ||
ab4e0192 DT |
901 | case EVIOCGKEYCODE: |
902 | return evdev_handle_get_keycode(dev, p); | |
903 | ||
904 | case EVIOCSKEYCODE: | |
905 | return evdev_handle_set_keycode(dev, p); | |
906 | ||
907 | case EVIOCGKEYCODE_V2: | |
908 | return evdev_handle_get_keycode_v2(dev, p); | |
909 | ||
910 | case EVIOCSKEYCODE_V2: | |
911 | return evdev_handle_set_keycode_v2(dev, p); | |
448cd166 | 912 | } |
1da177e4 | 913 | |
448cd166 | 914 | size = _IOC_SIZE(cmd); |
1da177e4 | 915 | |
448cd166 DT |
916 | /* Now check variable-length commands */ |
917 | #define EVIOC_MASK_SIZE(nr) ((nr) & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) | |
448cd166 | 918 | switch (EVIOC_MASK_SIZE(cmd)) { |
41e979f8 | 919 | |
85b77200 HR |
920 | case EVIOCGPROP(0): |
921 | return bits_to_user(dev->propbit, INPUT_PROP_MAX, | |
922 | size, p, compat_mode); | |
923 | ||
1cf0c6e6 HR |
924 | case EVIOCGMTSLOTS(0): |
925 | return evdev_handle_mt_request(dev, size, ip); | |
926 | ||
448cd166 | 927 | case EVIOCGKEY(0): |
48318028 DH |
928 | return evdev_handle_get_val(client, dev, EV_KEY, dev->key, |
929 | KEY_MAX, size, p, compat_mode); | |
1da177e4 | 930 | |
448cd166 | 931 | case EVIOCGLED(0): |
48318028 DH |
932 | return evdev_handle_get_val(client, dev, EV_LED, dev->led, |
933 | LED_MAX, size, p, compat_mode); | |
1da177e4 | 934 | |
448cd166 | 935 | case EVIOCGSND(0): |
48318028 DH |
936 | return evdev_handle_get_val(client, dev, EV_SND, dev->snd, |
937 | SND_MAX, size, p, compat_mode); | |
1da177e4 | 938 | |
448cd166 | 939 | case EVIOCGSW(0): |
48318028 DH |
940 | return evdev_handle_get_val(client, dev, EV_SW, dev->sw, |
941 | SW_MAX, size, p, compat_mode); | |
31581066 | 942 | |
448cd166 DT |
943 | case EVIOCGNAME(0): |
944 | return str_to_user(dev->name, size, p); | |
1da177e4 | 945 | |
448cd166 DT |
946 | case EVIOCGPHYS(0): |
947 | return str_to_user(dev->phys, size, p); | |
1da177e4 | 948 | |
448cd166 DT |
949 | case EVIOCGUNIQ(0): |
950 | return str_to_user(dev->uniq, size, p); | |
1da177e4 | 951 | |
448cd166 DT |
952 | case EVIOC_MASK_SIZE(EVIOCSFF): |
953 | if (input_ff_effect_from_user(p, size, &effect)) | |
954 | return -EFAULT; | |
1da177e4 | 955 | |
448cd166 | 956 | error = input_ff_upload(dev, &effect, file); |
1da177e4 | 957 | |
448cd166 DT |
958 | if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) |
959 | return -EFAULT; | |
41e979f8 | 960 | |
448cd166 DT |
961 | return error; |
962 | } | |
1da177e4 | 963 | |
448cd166 DT |
964 | /* Multi-number variable-length handlers */ |
965 | if (_IOC_TYPE(cmd) != 'E') | |
966 | return -EINVAL; | |
1da177e4 | 967 | |
448cd166 | 968 | if (_IOC_DIR(cmd) == _IOC_READ) { |
6addb1d6 | 969 | |
448cd166 DT |
970 | if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0))) |
971 | return handle_eviocgbit(dev, | |
972 | _IOC_NR(cmd) & EV_MAX, size, | |
973 | p, compat_mode); | |
1da177e4 | 974 | |
448cd166 | 975 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { |
f2278f31 | 976 | |
0a74a1df DM |
977 | if (!dev->absinfo) |
978 | return -EINVAL; | |
979 | ||
448cd166 DT |
980 | t = _IOC_NR(cmd) & ABS_MAX; |
981 | abs = dev->absinfo[t]; | |
f2278f31 | 982 | |
448cd166 DT |
983 | if (copy_to_user(p, &abs, min_t(size_t, |
984 | size, sizeof(struct input_absinfo)))) | |
985 | return -EFAULT; | |
f2278f31 | 986 | |
448cd166 DT |
987 | return 0; |
988 | } | |
989 | } | |
f2278f31 | 990 | |
f9ce6eb5 | 991 | if (_IOC_DIR(cmd) == _IOC_WRITE) { |
f2278f31 | 992 | |
448cd166 | 993 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { |
1da177e4 | 994 | |
0a74a1df DM |
995 | if (!dev->absinfo) |
996 | return -EINVAL; | |
997 | ||
448cd166 | 998 | t = _IOC_NR(cmd) & ABS_MAX; |
41e979f8 | 999 | |
448cd166 DT |
1000 | if (copy_from_user(&abs, p, min_t(size_t, |
1001 | size, sizeof(struct input_absinfo)))) | |
1002 | return -EFAULT; | |
1da177e4 | 1003 | |
448cd166 DT |
1004 | if (size < sizeof(struct input_absinfo)) |
1005 | abs.resolution = 0; | |
d31b2865 | 1006 | |
448cd166 DT |
1007 | /* We can't change number of reserved MT slots */ |
1008 | if (t == ABS_MT_SLOT) | |
1009 | return -EINVAL; | |
40d007e7 | 1010 | |
448cd166 DT |
1011 | /* |
1012 | * Take event lock to ensure that we are not | |
1013 | * changing device parameters in the middle | |
1014 | * of event. | |
1015 | */ | |
1016 | spin_lock_irq(&dev->event_lock); | |
1017 | dev->absinfo[t] = abs; | |
1018 | spin_unlock_irq(&dev->event_lock); | |
6addb1d6 | 1019 | |
448cd166 | 1020 | return 0; |
6addb1d6 | 1021 | } |
1da177e4 | 1022 | } |
448cd166 | 1023 | |
1da177e4 LT |
1024 | return -EINVAL; |
1025 | } | |
1da177e4 | 1026 | |
6addb1d6 DT |
1027 | static long evdev_ioctl_handler(struct file *file, unsigned int cmd, |
1028 | void __user *p, int compat_mode) | |
1029 | { | |
1030 | struct evdev_client *client = file->private_data; | |
1031 | struct evdev *evdev = client->evdev; | |
1032 | int retval; | |
1033 | ||
1034 | retval = mutex_lock_interruptible(&evdev->mutex); | |
1035 | if (retval) | |
1036 | return retval; | |
1037 | ||
c7dc6573 | 1038 | if (!evdev->exist || client->revoked) { |
6addb1d6 DT |
1039 | retval = -ENODEV; |
1040 | goto out; | |
1041 | } | |
1042 | ||
1043 | retval = evdev_do_ioctl(file, cmd, p, compat_mode); | |
1044 | ||
1045 | out: | |
1046 | mutex_unlock(&evdev->mutex); | |
1047 | return retval; | |
1048 | } | |
1049 | ||
3a51f7c4 DT |
1050 | static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1051 | { | |
1052 | return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0); | |
1053 | } | |
41e979f8 | 1054 | |
3a51f7c4 | 1055 | #ifdef CONFIG_COMPAT |
6addb1d6 DT |
1056 | static long evdev_ioctl_compat(struct file *file, |
1057 | unsigned int cmd, unsigned long arg) | |
52658bb6 | 1058 | { |
3a51f7c4 | 1059 | return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1); |
1da177e4 | 1060 | } |
52658bb6 | 1061 | #endif |
1da177e4 | 1062 | |
66e66118 | 1063 | static const struct file_operations evdev_fops = { |
6addb1d6 DT |
1064 | .owner = THIS_MODULE, |
1065 | .read = evdev_read, | |
1066 | .write = evdev_write, | |
1067 | .poll = evdev_poll, | |
1068 | .open = evdev_open, | |
1069 | .release = evdev_release, | |
1070 | .unlocked_ioctl = evdev_ioctl, | |
52658bb6 | 1071 | #ifdef CONFIG_COMPAT |
6addb1d6 | 1072 | .compat_ioctl = evdev_ioctl_compat, |
52658bb6 | 1073 | #endif |
6addb1d6 | 1074 | .fasync = evdev_fasync, |
6038f373 AB |
1075 | .flush = evdev_flush, |
1076 | .llseek = no_llseek, | |
1da177e4 LT |
1077 | }; |
1078 | ||
6addb1d6 DT |
1079 | /* |
1080 | * Mark device non-existent. This disables writes, ioctls and | |
1081 | * prevents new users from opening the device. Already posted | |
1082 | * blocking reads will stay, however new ones will fail. | |
1083 | */ | |
1084 | static void evdev_mark_dead(struct evdev *evdev) | |
1085 | { | |
1086 | mutex_lock(&evdev->mutex); | |
20da92de | 1087 | evdev->exist = false; |
6addb1d6 DT |
1088 | mutex_unlock(&evdev->mutex); |
1089 | } | |
1090 | ||
1091 | static void evdev_cleanup(struct evdev *evdev) | |
1092 | { | |
1093 | struct input_handle *handle = &evdev->handle; | |
1094 | ||
1095 | evdev_mark_dead(evdev); | |
1096 | evdev_hangup(evdev); | |
7f8d4cad DT |
1097 | |
1098 | cdev_del(&evdev->cdev); | |
6addb1d6 DT |
1099 | |
1100 | /* evdev is marked dead so no one else accesses evdev->open */ | |
1101 | if (evdev->open) { | |
1102 | input_flush_device(handle, NULL); | |
1103 | input_close_device(handle); | |
1104 | } | |
1105 | } | |
1106 | ||
1107 | /* | |
1108 | * Create new evdev device. Note that input core serializes calls | |
7f8d4cad | 1109 | * to connect and disconnect. |
6addb1d6 | 1110 | */ |
5b2a0826 DT |
1111 | static int evdev_connect(struct input_handler *handler, struct input_dev *dev, |
1112 | const struct input_device_id *id) | |
1da177e4 LT |
1113 | { |
1114 | struct evdev *evdev; | |
1115 | int minor; | |
7f8d4cad | 1116 | int dev_no; |
5b2a0826 | 1117 | int error; |
1da177e4 | 1118 | |
7f8d4cad DT |
1119 | minor = input_get_new_minor(EVDEV_MINOR_BASE, EVDEV_MINORS, true); |
1120 | if (minor < 0) { | |
1121 | error = minor; | |
1122 | pr_err("failed to reserve new minor: %d\n", error); | |
1123 | return error; | |
1da177e4 LT |
1124 | } |
1125 | ||
5b2a0826 | 1126 | evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL); |
7f8d4cad DT |
1127 | if (!evdev) { |
1128 | error = -ENOMEM; | |
1129 | goto err_free_minor; | |
1130 | } | |
1da177e4 | 1131 | |
d0ffb9be | 1132 | INIT_LIST_HEAD(&evdev->client_list); |
6addb1d6 DT |
1133 | spin_lock_init(&evdev->client_lock); |
1134 | mutex_init(&evdev->mutex); | |
1da177e4 | 1135 | init_waitqueue_head(&evdev->wait); |
20da92de | 1136 | evdev->exist = true; |
7f8d4cad DT |
1137 | |
1138 | dev_no = minor; | |
1139 | /* Normalize device number if it falls into legacy range */ | |
1140 | if (dev_no < EVDEV_MINOR_BASE + EVDEV_MINORS) | |
1141 | dev_no -= EVDEV_MINOR_BASE; | |
1142 | dev_set_name(&evdev->dev, "event%d", dev_no); | |
6addb1d6 | 1143 | |
a7097ff8 | 1144 | evdev->handle.dev = input_get_device(dev); |
3d5cb60e | 1145 | evdev->handle.name = dev_name(&evdev->dev); |
1da177e4 LT |
1146 | evdev->handle.handler = handler; |
1147 | evdev->handle.private = evdev; | |
1da177e4 | 1148 | |
7f8d4cad | 1149 | evdev->dev.devt = MKDEV(INPUT_MAJOR, minor); |
9657d75c DT |
1150 | evdev->dev.class = &input_class; |
1151 | evdev->dev.parent = &dev->dev; | |
9657d75c DT |
1152 | evdev->dev.release = evdev_free; |
1153 | device_initialize(&evdev->dev); | |
5b2a0826 | 1154 | |
6addb1d6 | 1155 | error = input_register_handle(&evdev->handle); |
5b2a0826 | 1156 | if (error) |
9657d75c | 1157 | goto err_free_evdev; |
5b2a0826 | 1158 | |
7f8d4cad | 1159 | cdev_init(&evdev->cdev, &evdev_fops); |
4a215aad | 1160 | evdev->cdev.kobj.parent = &evdev->dev.kobj; |
7f8d4cad | 1161 | error = cdev_add(&evdev->cdev, evdev->dev.devt, 1); |
6addb1d6 DT |
1162 | if (error) |
1163 | goto err_unregister_handle; | |
1164 | ||
1165 | error = device_add(&evdev->dev); | |
5b2a0826 | 1166 | if (error) |
6addb1d6 | 1167 | goto err_cleanup_evdev; |
1da177e4 | 1168 | |
5b2a0826 | 1169 | return 0; |
1da177e4 | 1170 | |
6addb1d6 DT |
1171 | err_cleanup_evdev: |
1172 | evdev_cleanup(evdev); | |
1173 | err_unregister_handle: | |
1174 | input_unregister_handle(&evdev->handle); | |
5b2a0826 | 1175 | err_free_evdev: |
9657d75c | 1176 | put_device(&evdev->dev); |
7f8d4cad DT |
1177 | err_free_minor: |
1178 | input_free_minor(minor); | |
5b2a0826 | 1179 | return error; |
1da177e4 LT |
1180 | } |
1181 | ||
1182 | static void evdev_disconnect(struct input_handle *handle) | |
1183 | { | |
1184 | struct evdev *evdev = handle->private; | |
1da177e4 | 1185 | |
9657d75c | 1186 | device_del(&evdev->dev); |
6addb1d6 | 1187 | evdev_cleanup(evdev); |
7f8d4cad | 1188 | input_free_minor(MINOR(evdev->dev.devt)); |
6addb1d6 | 1189 | input_unregister_handle(handle); |
9657d75c | 1190 | put_device(&evdev->dev); |
1da177e4 LT |
1191 | } |
1192 | ||
66e66118 | 1193 | static const struct input_device_id evdev_ids[] = { |
1da177e4 LT |
1194 | { .driver_info = 1 }, /* Matches all devices */ |
1195 | { }, /* Terminating zero entry */ | |
1196 | }; | |
1197 | ||
1198 | MODULE_DEVICE_TABLE(input, evdev_ids); | |
1199 | ||
1200 | static struct input_handler evdev_handler = { | |
6addb1d6 | 1201 | .event = evdev_event, |
a274ac15 | 1202 | .events = evdev_events, |
6addb1d6 DT |
1203 | .connect = evdev_connect, |
1204 | .disconnect = evdev_disconnect, | |
7f8d4cad | 1205 | .legacy_minors = true, |
6addb1d6 DT |
1206 | .minor = EVDEV_MINOR_BASE, |
1207 | .name = "evdev", | |
1208 | .id_table = evdev_ids, | |
1da177e4 LT |
1209 | }; |
1210 | ||
1211 | static int __init evdev_init(void) | |
1212 | { | |
4263cf0f | 1213 | return input_register_handler(&evdev_handler); |
1da177e4 LT |
1214 | } |
1215 | ||
1216 | static void __exit evdev_exit(void) | |
1217 | { | |
1218 | input_unregister_handler(&evdev_handler); | |
1219 | } | |
1220 | ||
1221 | module_init(evdev_init); | |
1222 | module_exit(evdev_exit); | |
1223 | ||
1224 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
1225 | MODULE_DESCRIPTION("Input driver event char devices"); | |
1226 | MODULE_LICENSE("GPL"); |