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 | 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 | ||
5cac2f4d TG |
111 | time = (client->clkid == CLOCK_MONOTONIC) ? |
112 | ktime_get() : ktime_get_real(); | |
48318028 DH |
113 | |
114 | ev.time = ktime_to_timeval(time); | |
115 | ev.type = EV_SYN; | |
116 | ev.code = SYN_DROPPED; | |
117 | ev.value = 0; | |
118 | ||
119 | spin_lock_irqsave(&client->buffer_lock, flags); | |
120 | ||
121 | client->buffer[client->head++] = ev; | |
122 | client->head &= client->bufsize - 1; | |
123 | ||
124 | if (unlikely(client->head == client->tail)) { | |
125 | /* drop queue but keep our SYN_DROPPED event */ | |
126 | client->tail = (client->head - 1) & (client->bufsize - 1); | |
127 | client->packet_head = client->tail; | |
128 | } | |
129 | ||
130 | spin_unlock_irqrestore(&client->buffer_lock, flags); | |
131 | } | |
132 | ||
a274ac15 HR |
133 | static void __pass_event(struct evdev_client *client, |
134 | const struct input_event *event) | |
6addb1d6 | 135 | { |
9fb0f14e JB |
136 | client->buffer[client->head++] = *event; |
137 | client->head &= client->bufsize - 1; | |
138 | ||
139 | if (unlikely(client->head == client->tail)) { | |
140 | /* | |
141 | * This effectively "drops" all unconsumed events, leaving | |
142 | * EV_SYN/SYN_DROPPED plus the newest event in the queue. | |
143 | */ | |
144 | client->tail = (client->head - 2) & (client->bufsize - 1); | |
145 | ||
146 | client->buffer[client->tail].time = event->time; | |
147 | client->buffer[client->tail].type = EV_SYN; | |
148 | client->buffer[client->tail].code = SYN_DROPPED; | |
149 | client->buffer[client->tail].value = 0; | |
9fb0f14e | 150 | |
cdda911c JB |
151 | client->packet_head = client->tail; |
152 | } | |
6addb1d6 | 153 | |
cdda911c JB |
154 | if (event->type == EV_SYN && event->code == SYN_REPORT) { |
155 | client->packet_head = client->head; | |
30a589fd | 156 | kill_fasync(&client->fasync, SIGIO, POLL_IN); |
cdda911c | 157 | } |
a274ac15 HR |
158 | } |
159 | ||
160 | static void evdev_pass_values(struct evdev_client *client, | |
161 | const struct input_value *vals, unsigned int count, | |
162 | ktime_t mono, ktime_t real) | |
163 | { | |
164 | struct evdev *evdev = client->evdev; | |
165 | const struct input_value *v; | |
166 | struct input_event event; | |
167 | bool wakeup = false; | |
168 | ||
c7dc6573 DH |
169 | if (client->revoked) |
170 | return; | |
171 | ||
a274ac15 HR |
172 | event.time = ktime_to_timeval(client->clkid == CLOCK_MONOTONIC ? |
173 | mono : real); | |
174 | ||
175 | /* Interrupts are disabled, just acquire the lock. */ | |
176 | spin_lock(&client->buffer_lock); | |
177 | ||
178 | for (v = vals; v != vals + count; v++) { | |
179 | event.type = v->type; | |
180 | event.code = v->code; | |
181 | event.value = v->value; | |
182 | __pass_event(client, &event); | |
183 | if (v->type == EV_SYN && v->code == SYN_REPORT) | |
184 | wakeup = true; | |
185 | } | |
cdda911c JB |
186 | |
187 | spin_unlock(&client->buffer_lock); | |
a274ac15 HR |
188 | |
189 | if (wakeup) | |
190 | wake_up_interruptible(&evdev->wait); | |
6addb1d6 DT |
191 | } |
192 | ||
193 | /* | |
a274ac15 | 194 | * Pass incoming events to all connected clients. |
6addb1d6 | 195 | */ |
a274ac15 HR |
196 | static void evdev_events(struct input_handle *handle, |
197 | const struct input_value *vals, unsigned int count) | |
1da177e4 LT |
198 | { |
199 | struct evdev *evdev = handle->private; | |
d0ffb9be | 200 | struct evdev_client *client; |
a80b83b7 JS |
201 | ktime_t time_mono, time_real; |
202 | ||
203 | time_mono = ktime_get(); | |
5cac2f4d | 204 | time_real = ktime_mono_to_real(time_mono); |
1da177e4 | 205 | |
82ba56c2 DT |
206 | rcu_read_lock(); |
207 | ||
6addb1d6 | 208 | client = rcu_dereference(evdev->grab); |
a80b83b7 | 209 | |
6addb1d6 | 210 | if (client) |
a274ac15 | 211 | evdev_pass_values(client, vals, count, time_mono, time_real); |
6addb1d6 DT |
212 | else |
213 | list_for_each_entry_rcu(client, &evdev->client_list, node) | |
a274ac15 HR |
214 | evdev_pass_values(client, vals, count, |
215 | time_mono, time_real); | |
1da177e4 | 216 | |
82ba56c2 | 217 | rcu_read_unlock(); |
a274ac15 | 218 | } |
82ba56c2 | 219 | |
a274ac15 HR |
220 | /* |
221 | * Pass incoming event to all connected clients. | |
222 | */ | |
223 | static void evdev_event(struct input_handle *handle, | |
224 | unsigned int type, unsigned int code, int value) | |
225 | { | |
226 | struct input_value vals[] = { { type, code, value } }; | |
227 | ||
228 | evdev_events(handle, vals, 1); | |
1da177e4 LT |
229 | } |
230 | ||
231 | static int evdev_fasync(int fd, struct file *file, int on) | |
232 | { | |
d0ffb9be | 233 | struct evdev_client *client = file->private_data; |
1e0afb28 | 234 | |
60aa4924 | 235 | return fasync_helper(fd, file, on, &client->fasync); |
1da177e4 LT |
236 | } |
237 | ||
1e0afb28 | 238 | static int evdev_flush(struct file *file, fl_owner_t id) |
1da177e4 | 239 | { |
d0ffb9be DT |
240 | struct evdev_client *client = file->private_data; |
241 | struct evdev *evdev = client->evdev; | |
6addb1d6 DT |
242 | int retval; |
243 | ||
244 | retval = mutex_lock_interruptible(&evdev->mutex); | |
245 | if (retval) | |
246 | return retval; | |
1e0afb28 | 247 | |
c7dc6573 | 248 | if (!evdev->exist || client->revoked) |
6addb1d6 DT |
249 | retval = -ENODEV; |
250 | else | |
251 | retval = input_flush_device(&evdev->handle, file); | |
1e0afb28 | 252 | |
6addb1d6 DT |
253 | mutex_unlock(&evdev->mutex); |
254 | return retval; | |
1da177e4 LT |
255 | } |
256 | ||
9657d75c | 257 | static void evdev_free(struct device *dev) |
1da177e4 | 258 | { |
9657d75c DT |
259 | struct evdev *evdev = container_of(dev, struct evdev, dev); |
260 | ||
a7097ff8 | 261 | input_put_device(evdev->handle.dev); |
1da177e4 LT |
262 | kfree(evdev); |
263 | } | |
264 | ||
6addb1d6 DT |
265 | /* |
266 | * Grabs an event device (along with underlying input device). | |
267 | * This function is called with evdev->mutex taken. | |
268 | */ | |
269 | static int evdev_grab(struct evdev *evdev, struct evdev_client *client) | |
270 | { | |
271 | int error; | |
272 | ||
273 | if (evdev->grab) | |
274 | return -EBUSY; | |
275 | ||
276 | error = input_grab_device(&evdev->handle); | |
277 | if (error) | |
278 | return error; | |
279 | ||
280 | rcu_assign_pointer(evdev->grab, client); | |
6addb1d6 DT |
281 | |
282 | return 0; | |
283 | } | |
284 | ||
285 | static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client) | |
286 | { | |
dba42580 DT |
287 | struct evdev_client *grab = rcu_dereference_protected(evdev->grab, |
288 | lockdep_is_held(&evdev->mutex)); | |
289 | ||
290 | if (grab != client) | |
6addb1d6 DT |
291 | return -EINVAL; |
292 | ||
293 | rcu_assign_pointer(evdev->grab, NULL); | |
82ba56c2 | 294 | synchronize_rcu(); |
6addb1d6 DT |
295 | input_release_device(&evdev->handle); |
296 | ||
297 | return 0; | |
298 | } | |
299 | ||
300 | static void evdev_attach_client(struct evdev *evdev, | |
301 | struct evdev_client *client) | |
302 | { | |
303 | spin_lock(&evdev->client_lock); | |
304 | list_add_tail_rcu(&client->node, &evdev->client_list); | |
305 | spin_unlock(&evdev->client_lock); | |
6addb1d6 DT |
306 | } |
307 | ||
308 | static void evdev_detach_client(struct evdev *evdev, | |
309 | struct evdev_client *client) | |
310 | { | |
311 | spin_lock(&evdev->client_lock); | |
312 | list_del_rcu(&client->node); | |
313 | spin_unlock(&evdev->client_lock); | |
82ba56c2 | 314 | synchronize_rcu(); |
6addb1d6 DT |
315 | } |
316 | ||
317 | static int evdev_open_device(struct evdev *evdev) | |
318 | { | |
319 | int retval; | |
320 | ||
321 | retval = mutex_lock_interruptible(&evdev->mutex); | |
322 | if (retval) | |
323 | return retval; | |
324 | ||
325 | if (!evdev->exist) | |
326 | retval = -ENODEV; | |
06445014 | 327 | else if (!evdev->open++) { |
6addb1d6 | 328 | retval = input_open_device(&evdev->handle); |
06445014 ON |
329 | if (retval) |
330 | evdev->open--; | |
331 | } | |
6addb1d6 DT |
332 | |
333 | mutex_unlock(&evdev->mutex); | |
334 | return retval; | |
335 | } | |
336 | ||
337 | static void evdev_close_device(struct evdev *evdev) | |
338 | { | |
339 | mutex_lock(&evdev->mutex); | |
340 | ||
341 | if (evdev->exist && !--evdev->open) | |
342 | input_close_device(&evdev->handle); | |
343 | ||
344 | mutex_unlock(&evdev->mutex); | |
345 | } | |
346 | ||
347 | /* | |
348 | * Wake up users waiting for IO so they can disconnect from | |
349 | * dead device. | |
350 | */ | |
351 | static void evdev_hangup(struct evdev *evdev) | |
352 | { | |
353 | struct evdev_client *client; | |
354 | ||
355 | spin_lock(&evdev->client_lock); | |
356 | list_for_each_entry(client, &evdev->client_list, node) | |
357 | kill_fasync(&client->fasync, SIGIO, POLL_HUP); | |
358 | spin_unlock(&evdev->client_lock); | |
359 | ||
360 | wake_up_interruptible(&evdev->wait); | |
361 | } | |
362 | ||
d0ffb9be | 363 | static int evdev_release(struct inode *inode, struct file *file) |
1da177e4 | 364 | { |
d0ffb9be DT |
365 | struct evdev_client *client = file->private_data; |
366 | struct evdev *evdev = client->evdev; | |
1da177e4 | 367 | |
6addb1d6 | 368 | mutex_lock(&evdev->mutex); |
dba42580 | 369 | evdev_ungrab(evdev, client); |
6addb1d6 | 370 | mutex_unlock(&evdev->mutex); |
1da177e4 | 371 | |
6addb1d6 | 372 | evdev_detach_client(evdev, client); |
92eb77d0 DS |
373 | |
374 | if (is_vmalloc_addr(client)) | |
375 | vfree(client); | |
376 | else | |
377 | kfree(client); | |
1da177e4 | 378 | |
6addb1d6 | 379 | evdev_close_device(evdev); |
1da177e4 | 380 | |
1da177e4 LT |
381 | return 0; |
382 | } | |
383 | ||
b58f7086 HR |
384 | static unsigned int evdev_compute_buffer_size(struct input_dev *dev) |
385 | { | |
63a6404d HR |
386 | unsigned int n_events = |
387 | max(dev->hint_events_per_packet * EVDEV_BUF_PACKETS, | |
388 | EVDEV_MIN_BUFFER_SIZE); | |
389 | ||
390 | return roundup_pow_of_two(n_events); | |
b58f7086 HR |
391 | } |
392 | ||
d0ffb9be | 393 | static int evdev_open(struct inode *inode, struct file *file) |
1da177e4 | 394 | { |
7f8d4cad DT |
395 | struct evdev *evdev = container_of(inode->i_cdev, struct evdev, cdev); |
396 | unsigned int bufsize = evdev_compute_buffer_size(evdev->handle.dev); | |
92eb77d0 DS |
397 | unsigned int size = sizeof(struct evdev_client) + |
398 | bufsize * sizeof(struct input_event); | |
6addb1d6 | 399 | struct evdev_client *client; |
d542ed82 | 400 | int error; |
1da177e4 | 401 | |
92eb77d0 DS |
402 | client = kzalloc(size, GFP_KERNEL | __GFP_NOWARN); |
403 | if (!client) | |
404 | client = vzalloc(size); | |
7f8d4cad DT |
405 | if (!client) |
406 | return -ENOMEM; | |
1da177e4 | 407 | |
b58f7086 | 408 | client->bufsize = bufsize; |
6addb1d6 | 409 | spin_lock_init(&client->buffer_lock); |
d0ffb9be | 410 | client->evdev = evdev; |
6addb1d6 | 411 | evdev_attach_client(evdev, client); |
1da177e4 | 412 | |
6addb1d6 DT |
413 | error = evdev_open_device(evdev); |
414 | if (error) | |
415 | goto err_free_client; | |
1da177e4 | 416 | |
d0ffb9be | 417 | file->private_data = client; |
3d7bbd45 DT |
418 | nonseekable_open(inode, file); |
419 | ||
1da177e4 | 420 | return 0; |
9657d75c DT |
421 | |
422 | err_free_client: | |
6addb1d6 | 423 | evdev_detach_client(evdev, client); |
92788ac1 | 424 | kvfree(client); |
9657d75c | 425 | return error; |
1da177e4 LT |
426 | } |
427 | ||
6addb1d6 DT |
428 | static ssize_t evdev_write(struct file *file, const char __user *buffer, |
429 | size_t count, loff_t *ppos) | |
3a51f7c4 | 430 | { |
d0ffb9be DT |
431 | struct evdev_client *client = file->private_data; |
432 | struct evdev *evdev = client->evdev; | |
3a51f7c4 | 433 | struct input_event event; |
02dfc496 | 434 | int retval = 0; |
52658bb6 | 435 | |
2872a9b5 | 436 | if (count != 0 && count < input_event_size()) |
439581ec PK |
437 | return -EINVAL; |
438 | ||
6addb1d6 DT |
439 | retval = mutex_lock_interruptible(&evdev->mutex); |
440 | if (retval) | |
441 | return retval; | |
442 | ||
c7dc6573 | 443 | if (!evdev->exist || client->revoked) { |
6addb1d6 DT |
444 | retval = -ENODEV; |
445 | goto out; | |
446 | } | |
52658bb6 | 447 | |
2872a9b5 DT |
448 | while (retval + input_event_size() <= count) { |
449 | ||
2d56f3a3 | 450 | if (input_event_from_user(buffer + retval, &event)) { |
6addb1d6 DT |
451 | retval = -EFAULT; |
452 | goto out; | |
453 | } | |
439581ec | 454 | retval += input_event_size(); |
6addb1d6 DT |
455 | |
456 | input_inject_event(&evdev->handle, | |
457 | event.type, event.code, event.value); | |
2872a9b5 | 458 | } |
52658bb6 | 459 | |
6addb1d6 DT |
460 | out: |
461 | mutex_unlock(&evdev->mutex); | |
52658bb6 JK |
462 | return retval; |
463 | } | |
52658bb6 | 464 | |
6addb1d6 DT |
465 | static int evdev_fetch_next_event(struct evdev_client *client, |
466 | struct input_event *event) | |
467 | { | |
468 | int have_event; | |
469 | ||
470 | spin_lock_irq(&client->buffer_lock); | |
471 | ||
566cf5b6 | 472 | have_event = client->packet_head != client->tail; |
6addb1d6 DT |
473 | if (have_event) { |
474 | *event = client->buffer[client->tail++]; | |
b58f7086 | 475 | client->tail &= client->bufsize - 1; |
6addb1d6 DT |
476 | } |
477 | ||
478 | spin_unlock_irq(&client->buffer_lock); | |
479 | ||
480 | return have_event; | |
481 | } | |
482 | ||
483 | static ssize_t evdev_read(struct file *file, char __user *buffer, | |
484 | size_t count, loff_t *ppos) | |
1da177e4 | 485 | { |
d0ffb9be DT |
486 | struct evdev_client *client = file->private_data; |
487 | struct evdev *evdev = client->evdev; | |
6addb1d6 | 488 | struct input_event event; |
2872a9b5 DT |
489 | size_t read = 0; |
490 | int error; | |
1da177e4 | 491 | |
2872a9b5 | 492 | if (count != 0 && count < input_event_size()) |
1da177e4 LT |
493 | return -EINVAL; |
494 | ||
2872a9b5 | 495 | for (;;) { |
c7dc6573 | 496 | if (!evdev->exist || client->revoked) |
2872a9b5 | 497 | return -ENODEV; |
1da177e4 | 498 | |
2872a9b5 DT |
499 | if (client->packet_head == client->tail && |
500 | (file->f_flags & O_NONBLOCK)) | |
501 | return -EAGAIN; | |
502 | ||
503 | /* | |
504 | * count == 0 is special - no IO is done but we check | |
505 | * for error conditions (see above). | |
506 | */ | |
507 | if (count == 0) | |
508 | break; | |
1da177e4 | 509 | |
2872a9b5 DT |
510 | while (read + input_event_size() <= count && |
511 | evdev_fetch_next_event(client, &event)) { | |
3a51f7c4 | 512 | |
2872a9b5 DT |
513 | if (input_event_to_user(buffer + read, &event)) |
514 | return -EFAULT; | |
3a51f7c4 | 515 | |
2872a9b5 DT |
516 | read += input_event_size(); |
517 | } | |
1da177e4 | 518 | |
2872a9b5 DT |
519 | if (read) |
520 | break; | |
e90f869c | 521 | |
2872a9b5 DT |
522 | if (!(file->f_flags & O_NONBLOCK)) { |
523 | error = wait_event_interruptible(evdev->wait, | |
524 | client->packet_head != client->tail || | |
c7dc6573 | 525 | !evdev->exist || client->revoked); |
2872a9b5 DT |
526 | if (error) |
527 | return error; | |
528 | } | |
529 | } | |
530 | ||
531 | return read; | |
1da177e4 LT |
532 | } |
533 | ||
534 | /* No kernel lock - fine */ | |
535 | static unsigned int evdev_poll(struct file *file, poll_table *wait) | |
536 | { | |
d0ffb9be DT |
537 | struct evdev_client *client = file->private_data; |
538 | struct evdev *evdev = client->evdev; | |
c18fb139 | 539 | unsigned int mask; |
1e0afb28 | 540 | |
d0ffb9be | 541 | poll_wait(file, &evdev->wait, wait); |
c18fb139 | 542 | |
c7dc6573 DH |
543 | if (evdev->exist && !client->revoked) |
544 | mask = POLLOUT | POLLWRNORM; | |
545 | else | |
546 | mask = POLLHUP | POLLERR; | |
547 | ||
cdda911c | 548 | if (client->packet_head != client->tail) |
c18fb139 DT |
549 | mask |= POLLIN | POLLRDNORM; |
550 | ||
551 | return mask; | |
1da177e4 LT |
552 | } |
553 | ||
3a51f7c4 DT |
554 | #ifdef CONFIG_COMPAT |
555 | ||
556 | #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) | |
7b19ada2 | 557 | #define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1) |
3a51f7c4 DT |
558 | |
559 | #ifdef __BIG_ENDIAN | |
560 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
561 | unsigned int maxlen, void __user *p, int compat) | |
562 | { | |
563 | int len, i; | |
564 | ||
565 | if (compat) { | |
7b19ada2 | 566 | len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t); |
bf61f8d3 | 567 | if (len > maxlen) |
3a51f7c4 DT |
568 | len = maxlen; |
569 | ||
570 | for (i = 0; i < len / sizeof(compat_long_t); i++) | |
571 | if (copy_to_user((compat_long_t __user *) p + i, | |
572 | (compat_long_t *) bits + | |
573 | i + 1 - ((i % 2) << 1), | |
574 | sizeof(compat_long_t))) | |
575 | return -EFAULT; | |
576 | } else { | |
7b19ada2 | 577 | len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
578 | if (len > maxlen) |
579 | len = maxlen; | |
580 | ||
581 | if (copy_to_user(p, bits, len)) | |
582 | return -EFAULT; | |
583 | } | |
584 | ||
585 | return len; | |
586 | } | |
587 | #else | |
588 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
589 | unsigned int maxlen, void __user *p, int compat) | |
590 | { | |
591 | int len = compat ? | |
7b19ada2 JS |
592 | BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) : |
593 | BITS_TO_LONGS(maxbit) * sizeof(long); | |
3a51f7c4 DT |
594 | |
595 | if (len > maxlen) | |
596 | len = maxlen; | |
597 | ||
598 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
599 | } | |
600 | #endif /* __BIG_ENDIAN */ | |
601 | ||
602 | #else | |
603 | ||
604 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
605 | unsigned int maxlen, void __user *p, int compat) | |
606 | { | |
7b19ada2 | 607 | int len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
608 | |
609 | if (len > maxlen) | |
610 | len = maxlen; | |
611 | ||
612 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
613 | } | |
614 | ||
615 | #endif /* CONFIG_COMPAT */ | |
616 | ||
617 | static int str_to_user(const char *str, unsigned int maxlen, void __user *p) | |
618 | { | |
619 | int len; | |
620 | ||
621 | if (!str) | |
622 | return -ENOENT; | |
623 | ||
624 | len = strlen(str) + 1; | |
625 | if (len > maxlen) | |
626 | len = maxlen; | |
627 | ||
628 | return copy_to_user(p, str, len) ? -EFAULT : len; | |
629 | } | |
630 | ||
448cd166 DT |
631 | static int handle_eviocgbit(struct input_dev *dev, |
632 | unsigned int type, unsigned int size, | |
633 | void __user *p, int compat_mode) | |
5402a734 LT |
634 | { |
635 | unsigned long *bits; | |
636 | int len; | |
637 | ||
448cd166 | 638 | switch (type) { |
5402a734 LT |
639 | |
640 | case 0: bits = dev->evbit; len = EV_MAX; break; | |
641 | case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; | |
642 | case EV_REL: bits = dev->relbit; len = REL_MAX; break; | |
643 | case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; | |
644 | case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; | |
645 | case EV_LED: bits = dev->ledbit; len = LED_MAX; break; | |
646 | case EV_SND: bits = dev->sndbit; len = SND_MAX; break; | |
647 | case EV_FF: bits = dev->ffbit; len = FF_MAX; break; | |
648 | case EV_SW: bits = dev->swbit; len = SW_MAX; break; | |
649 | default: return -EINVAL; | |
650 | } | |
f2afa771 | 651 | |
448cd166 | 652 | return bits_to_user(bits, len, size, p, compat_mode); |
5402a734 | 653 | } |
5402a734 | 654 | |
ab4e0192 | 655 | static int evdev_handle_get_keycode(struct input_dev *dev, void __user *p) |
8613e4c2 | 656 | { |
ab4e0192 DT |
657 | struct input_keymap_entry ke = { |
658 | .len = sizeof(unsigned int), | |
659 | .flags = 0, | |
660 | }; | |
661 | int __user *ip = (int __user *)p; | |
8613e4c2 MCC |
662 | int error; |
663 | ||
ab4e0192 DT |
664 | /* legacy case */ |
665 | if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) | |
666 | return -EFAULT; | |
8613e4c2 | 667 | |
ab4e0192 DT |
668 | error = input_get_keycode(dev, &ke); |
669 | if (error) | |
670 | return error; | |
8613e4c2 | 671 | |
ab4e0192 DT |
672 | if (put_user(ke.keycode, ip + 1)) |
673 | return -EFAULT; | |
8613e4c2 | 674 | |
ab4e0192 DT |
675 | return 0; |
676 | } | |
8613e4c2 | 677 | |
ab4e0192 DT |
678 | static int evdev_handle_get_keycode_v2(struct input_dev *dev, void __user *p) |
679 | { | |
680 | struct input_keymap_entry ke; | |
681 | int error; | |
8613e4c2 | 682 | |
ab4e0192 DT |
683 | if (copy_from_user(&ke, p, sizeof(ke))) |
684 | return -EFAULT; | |
8613e4c2 | 685 | |
ab4e0192 DT |
686 | error = input_get_keycode(dev, &ke); |
687 | if (error) | |
688 | return error; | |
8613e4c2 | 689 | |
ab4e0192 DT |
690 | if (copy_to_user(p, &ke, sizeof(ke))) |
691 | return -EFAULT; | |
8613e4c2 | 692 | |
8613e4c2 MCC |
693 | return 0; |
694 | } | |
695 | ||
ab4e0192 | 696 | static int evdev_handle_set_keycode(struct input_dev *dev, void __user *p) |
8613e4c2 | 697 | { |
ab4e0192 DT |
698 | struct input_keymap_entry ke = { |
699 | .len = sizeof(unsigned int), | |
700 | .flags = 0, | |
701 | }; | |
702 | int __user *ip = (int __user *)p; | |
8613e4c2 | 703 | |
ab4e0192 DT |
704 | if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) |
705 | return -EFAULT; | |
8613e4c2 | 706 | |
ab4e0192 DT |
707 | if (get_user(ke.keycode, ip + 1)) |
708 | return -EFAULT; | |
8613e4c2 | 709 | |
ab4e0192 DT |
710 | return input_set_keycode(dev, &ke); |
711 | } | |
8613e4c2 | 712 | |
ab4e0192 DT |
713 | static int evdev_handle_set_keycode_v2(struct input_dev *dev, void __user *p) |
714 | { | |
715 | struct input_keymap_entry ke; | |
8613e4c2 | 716 | |
ab4e0192 DT |
717 | if (copy_from_user(&ke, p, sizeof(ke))) |
718 | return -EFAULT; | |
8613e4c2 | 719 | |
ab4e0192 DT |
720 | if (ke.len > sizeof(ke.scancode)) |
721 | return -EINVAL; | |
8613e4c2 MCC |
722 | |
723 | return input_set_keycode(dev, &ke); | |
724 | } | |
725 | ||
48318028 DH |
726 | /* |
727 | * If we transfer state to the user, we should flush all pending events | |
728 | * of the same type from the client's queue. Otherwise, they might end up | |
729 | * with duplicate events, which can screw up client's state tracking. | |
730 | * If bits_to_user fails after flushing the queue, we queue a SYN_DROPPED | |
731 | * event so user-space will notice missing events. | |
732 | * | |
733 | * LOCKING: | |
734 | * We need to take event_lock before buffer_lock to avoid dead-locks. But we | |
735 | * need the even_lock only to guarantee consistent state. We can safely release | |
736 | * it while flushing the queue. This allows input-core to handle filters while | |
737 | * we flush the queue. | |
738 | */ | |
739 | static int evdev_handle_get_val(struct evdev_client *client, | |
740 | struct input_dev *dev, unsigned int type, | |
7c4f5607 DT |
741 | unsigned long *bits, unsigned int maxbit, |
742 | unsigned int maxlen, void __user *p, | |
743 | int compat) | |
48318028 DH |
744 | { |
745 | int ret; | |
746 | unsigned long *mem; | |
7c4f5607 | 747 | size_t len; |
48318028 | 748 | |
7c4f5607 DT |
749 | len = BITS_TO_LONGS(maxbit) * sizeof(unsigned long); |
750 | mem = kmalloc(len, GFP_KERNEL); | |
48318028 DH |
751 | if (!mem) |
752 | return -ENOMEM; | |
753 | ||
754 | spin_lock_irq(&dev->event_lock); | |
755 | spin_lock(&client->buffer_lock); | |
756 | ||
7c4f5607 | 757 | memcpy(mem, bits, len); |
48318028 DH |
758 | |
759 | spin_unlock(&dev->event_lock); | |
760 | ||
761 | __evdev_flush_queue(client, type); | |
762 | ||
763 | spin_unlock_irq(&client->buffer_lock); | |
764 | ||
7c4f5607 | 765 | ret = bits_to_user(mem, maxbit, maxlen, p, compat); |
48318028 DH |
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 | ||
c7dc6573 DH |
798 | static int evdev_revoke(struct evdev *evdev, struct evdev_client *client, |
799 | struct file *file) | |
800 | { | |
801 | client->revoked = true; | |
802 | evdev_ungrab(evdev, client); | |
803 | input_flush_device(&evdev->handle, file); | |
804 | wake_up_interruptible(&evdev->wait); | |
805 | ||
806 | return 0; | |
807 | } | |
808 | ||
6addb1d6 DT |
809 | static long evdev_do_ioctl(struct file *file, unsigned int cmd, |
810 | void __user *p, int compat_mode) | |
1da177e4 | 811 | { |
d0ffb9be DT |
812 | struct evdev_client *client = file->private_data; |
813 | struct evdev *evdev = client->evdev; | |
1da177e4 LT |
814 | struct input_dev *dev = evdev->handle.dev; |
815 | struct input_absinfo abs; | |
509ca1a9 | 816 | struct ff_effect effect; |
3a51f7c4 | 817 | int __user *ip = (int __user *)p; |
58b93995 | 818 | unsigned int i, t, u, v; |
448cd166 | 819 | unsigned int size; |
509ca1a9 | 820 | int error; |
1da177e4 | 821 | |
448cd166 | 822 | /* First we check for fixed-length commands */ |
1da177e4 LT |
823 | switch (cmd) { |
824 | ||
6addb1d6 DT |
825 | case EVIOCGVERSION: |
826 | return put_user(EV_VERSION, ip); | |
1da177e4 | 827 | |
6addb1d6 DT |
828 | case EVIOCGID: |
829 | if (copy_to_user(p, &dev->id, sizeof(struct input_id))) | |
830 | return -EFAULT; | |
831 | return 0; | |
08791e5c | 832 | |
6addb1d6 DT |
833 | case EVIOCGREP: |
834 | if (!test_bit(EV_REP, dev->evbit)) | |
835 | return -ENOSYS; | |
836 | if (put_user(dev->rep[REP_DELAY], ip)) | |
837 | return -EFAULT; | |
838 | if (put_user(dev->rep[REP_PERIOD], ip + 1)) | |
839 | return -EFAULT; | |
840 | return 0; | |
08791e5c | 841 | |
6addb1d6 DT |
842 | case EVIOCSREP: |
843 | if (!test_bit(EV_REP, dev->evbit)) | |
844 | return -ENOSYS; | |
845 | if (get_user(u, ip)) | |
846 | return -EFAULT; | |
847 | if (get_user(v, ip + 1)) | |
848 | return -EFAULT; | |
08791e5c | 849 | |
6addb1d6 DT |
850 | input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u); |
851 | input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v); | |
3a51f7c4 | 852 | |
6addb1d6 | 853 | return 0; |
1da177e4 | 854 | |
6addb1d6 DT |
855 | case EVIOCRMFF: |
856 | return input_ff_erase(dev, (int)(unsigned long) p, file); | |
1da177e4 | 857 | |
6addb1d6 DT |
858 | case EVIOCGEFFECTS: |
859 | i = test_bit(EV_FF, dev->evbit) ? | |
860 | dev->ff->max_effects : 0; | |
861 | if (put_user(i, ip)) | |
862 | return -EFAULT; | |
863 | return 0; | |
864 | ||
865 | case EVIOCGRAB: | |
866 | if (p) | |
867 | return evdev_grab(evdev, client); | |
868 | else | |
869 | return evdev_ungrab(evdev, client); | |
ab4e0192 | 870 | |
c7dc6573 DH |
871 | case EVIOCREVOKE: |
872 | if (p) | |
873 | return -EINVAL; | |
874 | else | |
875 | return evdev_revoke(evdev, client, file); | |
876 | ||
a80b83b7 JS |
877 | case EVIOCSCLOCKID: |
878 | if (copy_from_user(&i, p, sizeof(unsigned int))) | |
879 | return -EFAULT; | |
880 | if (i != CLOCK_MONOTONIC && i != CLOCK_REALTIME) | |
881 | return -EINVAL; | |
882 | client->clkid = i; | |
883 | return 0; | |
884 | ||
ab4e0192 DT |
885 | case EVIOCGKEYCODE: |
886 | return evdev_handle_get_keycode(dev, p); | |
887 | ||
888 | case EVIOCSKEYCODE: | |
889 | return evdev_handle_set_keycode(dev, p); | |
890 | ||
891 | case EVIOCGKEYCODE_V2: | |
892 | return evdev_handle_get_keycode_v2(dev, p); | |
893 | ||
894 | case EVIOCSKEYCODE_V2: | |
895 | return evdev_handle_set_keycode_v2(dev, p); | |
448cd166 | 896 | } |
1da177e4 | 897 | |
448cd166 | 898 | size = _IOC_SIZE(cmd); |
1da177e4 | 899 | |
448cd166 DT |
900 | /* Now check variable-length commands */ |
901 | #define EVIOC_MASK_SIZE(nr) ((nr) & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) | |
448cd166 | 902 | switch (EVIOC_MASK_SIZE(cmd)) { |
41e979f8 | 903 | |
85b77200 HR |
904 | case EVIOCGPROP(0): |
905 | return bits_to_user(dev->propbit, INPUT_PROP_MAX, | |
906 | size, p, compat_mode); | |
907 | ||
1cf0c6e6 HR |
908 | case EVIOCGMTSLOTS(0): |
909 | return evdev_handle_mt_request(dev, size, ip); | |
910 | ||
448cd166 | 911 | case EVIOCGKEY(0): |
48318028 DH |
912 | return evdev_handle_get_val(client, dev, EV_KEY, dev->key, |
913 | KEY_MAX, size, p, compat_mode); | |
1da177e4 | 914 | |
448cd166 | 915 | case EVIOCGLED(0): |
48318028 DH |
916 | return evdev_handle_get_val(client, dev, EV_LED, dev->led, |
917 | LED_MAX, size, p, compat_mode); | |
1da177e4 | 918 | |
448cd166 | 919 | case EVIOCGSND(0): |
48318028 DH |
920 | return evdev_handle_get_val(client, dev, EV_SND, dev->snd, |
921 | SND_MAX, size, p, compat_mode); | |
1da177e4 | 922 | |
448cd166 | 923 | case EVIOCGSW(0): |
48318028 DH |
924 | return evdev_handle_get_val(client, dev, EV_SW, dev->sw, |
925 | SW_MAX, size, p, compat_mode); | |
31581066 | 926 | |
448cd166 DT |
927 | case EVIOCGNAME(0): |
928 | return str_to_user(dev->name, size, p); | |
1da177e4 | 929 | |
448cd166 DT |
930 | case EVIOCGPHYS(0): |
931 | return str_to_user(dev->phys, size, p); | |
1da177e4 | 932 | |
448cd166 DT |
933 | case EVIOCGUNIQ(0): |
934 | return str_to_user(dev->uniq, size, p); | |
1da177e4 | 935 | |
448cd166 DT |
936 | case EVIOC_MASK_SIZE(EVIOCSFF): |
937 | if (input_ff_effect_from_user(p, size, &effect)) | |
938 | return -EFAULT; | |
1da177e4 | 939 | |
448cd166 | 940 | error = input_ff_upload(dev, &effect, file); |
fc7392aa EV |
941 | if (error) |
942 | return error; | |
1da177e4 | 943 | |
448cd166 DT |
944 | if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) |
945 | return -EFAULT; | |
41e979f8 | 946 | |
fc7392aa | 947 | return 0; |
448cd166 | 948 | } |
1da177e4 | 949 | |
448cd166 DT |
950 | /* Multi-number variable-length handlers */ |
951 | if (_IOC_TYPE(cmd) != 'E') | |
952 | return -EINVAL; | |
1da177e4 | 953 | |
448cd166 | 954 | if (_IOC_DIR(cmd) == _IOC_READ) { |
6addb1d6 | 955 | |
448cd166 DT |
956 | if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0))) |
957 | return handle_eviocgbit(dev, | |
958 | _IOC_NR(cmd) & EV_MAX, size, | |
959 | p, compat_mode); | |
1da177e4 | 960 | |
448cd166 | 961 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { |
f2278f31 | 962 | |
0a74a1df DM |
963 | if (!dev->absinfo) |
964 | return -EINVAL; | |
965 | ||
448cd166 DT |
966 | t = _IOC_NR(cmd) & ABS_MAX; |
967 | abs = dev->absinfo[t]; | |
f2278f31 | 968 | |
448cd166 DT |
969 | if (copy_to_user(p, &abs, min_t(size_t, |
970 | size, sizeof(struct input_absinfo)))) | |
971 | return -EFAULT; | |
f2278f31 | 972 | |
448cd166 DT |
973 | return 0; |
974 | } | |
975 | } | |
f2278f31 | 976 | |
f9ce6eb5 | 977 | if (_IOC_DIR(cmd) == _IOC_WRITE) { |
f2278f31 | 978 | |
448cd166 | 979 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { |
1da177e4 | 980 | |
0a74a1df DM |
981 | if (!dev->absinfo) |
982 | return -EINVAL; | |
983 | ||
448cd166 | 984 | t = _IOC_NR(cmd) & ABS_MAX; |
41e979f8 | 985 | |
448cd166 DT |
986 | if (copy_from_user(&abs, p, min_t(size_t, |
987 | size, sizeof(struct input_absinfo)))) | |
988 | return -EFAULT; | |
1da177e4 | 989 | |
448cd166 DT |
990 | if (size < sizeof(struct input_absinfo)) |
991 | abs.resolution = 0; | |
d31b2865 | 992 | |
448cd166 DT |
993 | /* We can't change number of reserved MT slots */ |
994 | if (t == ABS_MT_SLOT) | |
995 | return -EINVAL; | |
40d007e7 | 996 | |
448cd166 DT |
997 | /* |
998 | * Take event lock to ensure that we are not | |
999 | * changing device parameters in the middle | |
1000 | * of event. | |
1001 | */ | |
1002 | spin_lock_irq(&dev->event_lock); | |
1003 | dev->absinfo[t] = abs; | |
1004 | spin_unlock_irq(&dev->event_lock); | |
6addb1d6 | 1005 | |
448cd166 | 1006 | return 0; |
6addb1d6 | 1007 | } |
1da177e4 | 1008 | } |
448cd166 | 1009 | |
1da177e4 LT |
1010 | return -EINVAL; |
1011 | } | |
1da177e4 | 1012 | |
6addb1d6 DT |
1013 | static long evdev_ioctl_handler(struct file *file, unsigned int cmd, |
1014 | void __user *p, int compat_mode) | |
1015 | { | |
1016 | struct evdev_client *client = file->private_data; | |
1017 | struct evdev *evdev = client->evdev; | |
1018 | int retval; | |
1019 | ||
1020 | retval = mutex_lock_interruptible(&evdev->mutex); | |
1021 | if (retval) | |
1022 | return retval; | |
1023 | ||
c7dc6573 | 1024 | if (!evdev->exist || client->revoked) { |
6addb1d6 DT |
1025 | retval = -ENODEV; |
1026 | goto out; | |
1027 | } | |
1028 | ||
1029 | retval = evdev_do_ioctl(file, cmd, p, compat_mode); | |
1030 | ||
1031 | out: | |
1032 | mutex_unlock(&evdev->mutex); | |
1033 | return retval; | |
1034 | } | |
1035 | ||
3a51f7c4 DT |
1036 | static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1037 | { | |
1038 | return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0); | |
1039 | } | |
41e979f8 | 1040 | |
3a51f7c4 | 1041 | #ifdef CONFIG_COMPAT |
6addb1d6 DT |
1042 | static long evdev_ioctl_compat(struct file *file, |
1043 | unsigned int cmd, unsigned long arg) | |
52658bb6 | 1044 | { |
3a51f7c4 | 1045 | return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1); |
1da177e4 | 1046 | } |
52658bb6 | 1047 | #endif |
1da177e4 | 1048 | |
66e66118 | 1049 | static const struct file_operations evdev_fops = { |
6addb1d6 DT |
1050 | .owner = THIS_MODULE, |
1051 | .read = evdev_read, | |
1052 | .write = evdev_write, | |
1053 | .poll = evdev_poll, | |
1054 | .open = evdev_open, | |
1055 | .release = evdev_release, | |
1056 | .unlocked_ioctl = evdev_ioctl, | |
52658bb6 | 1057 | #ifdef CONFIG_COMPAT |
6addb1d6 | 1058 | .compat_ioctl = evdev_ioctl_compat, |
52658bb6 | 1059 | #endif |
6addb1d6 | 1060 | .fasync = evdev_fasync, |
6038f373 AB |
1061 | .flush = evdev_flush, |
1062 | .llseek = no_llseek, | |
1da177e4 LT |
1063 | }; |
1064 | ||
6addb1d6 DT |
1065 | /* |
1066 | * Mark device non-existent. This disables writes, ioctls and | |
1067 | * prevents new users from opening the device. Already posted | |
1068 | * blocking reads will stay, however new ones will fail. | |
1069 | */ | |
1070 | static void evdev_mark_dead(struct evdev *evdev) | |
1071 | { | |
1072 | mutex_lock(&evdev->mutex); | |
20da92de | 1073 | evdev->exist = false; |
6addb1d6 DT |
1074 | mutex_unlock(&evdev->mutex); |
1075 | } | |
1076 | ||
1077 | static void evdev_cleanup(struct evdev *evdev) | |
1078 | { | |
1079 | struct input_handle *handle = &evdev->handle; | |
1080 | ||
1081 | evdev_mark_dead(evdev); | |
1082 | evdev_hangup(evdev); | |
7f8d4cad DT |
1083 | |
1084 | cdev_del(&evdev->cdev); | |
6addb1d6 DT |
1085 | |
1086 | /* evdev is marked dead so no one else accesses evdev->open */ | |
1087 | if (evdev->open) { | |
1088 | input_flush_device(handle, NULL); | |
1089 | input_close_device(handle); | |
1090 | } | |
1091 | } | |
1092 | ||
1093 | /* | |
1094 | * Create new evdev device. Note that input core serializes calls | |
7f8d4cad | 1095 | * to connect and disconnect. |
6addb1d6 | 1096 | */ |
5b2a0826 DT |
1097 | static int evdev_connect(struct input_handler *handler, struct input_dev *dev, |
1098 | const struct input_device_id *id) | |
1da177e4 LT |
1099 | { |
1100 | struct evdev *evdev; | |
1101 | int minor; | |
7f8d4cad | 1102 | int dev_no; |
5b2a0826 | 1103 | int error; |
1da177e4 | 1104 | |
7f8d4cad DT |
1105 | minor = input_get_new_minor(EVDEV_MINOR_BASE, EVDEV_MINORS, true); |
1106 | if (minor < 0) { | |
1107 | error = minor; | |
1108 | pr_err("failed to reserve new minor: %d\n", error); | |
1109 | return error; | |
1da177e4 LT |
1110 | } |
1111 | ||
5b2a0826 | 1112 | evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL); |
7f8d4cad DT |
1113 | if (!evdev) { |
1114 | error = -ENOMEM; | |
1115 | goto err_free_minor; | |
1116 | } | |
1da177e4 | 1117 | |
d0ffb9be | 1118 | INIT_LIST_HEAD(&evdev->client_list); |
6addb1d6 DT |
1119 | spin_lock_init(&evdev->client_lock); |
1120 | mutex_init(&evdev->mutex); | |
1da177e4 | 1121 | init_waitqueue_head(&evdev->wait); |
20da92de | 1122 | evdev->exist = true; |
7f8d4cad DT |
1123 | |
1124 | dev_no = minor; | |
1125 | /* Normalize device number if it falls into legacy range */ | |
1126 | if (dev_no < EVDEV_MINOR_BASE + EVDEV_MINORS) | |
1127 | dev_no -= EVDEV_MINOR_BASE; | |
1128 | dev_set_name(&evdev->dev, "event%d", dev_no); | |
6addb1d6 | 1129 | |
a7097ff8 | 1130 | evdev->handle.dev = input_get_device(dev); |
3d5cb60e | 1131 | evdev->handle.name = dev_name(&evdev->dev); |
1da177e4 LT |
1132 | evdev->handle.handler = handler; |
1133 | evdev->handle.private = evdev; | |
1da177e4 | 1134 | |
7f8d4cad | 1135 | evdev->dev.devt = MKDEV(INPUT_MAJOR, minor); |
9657d75c DT |
1136 | evdev->dev.class = &input_class; |
1137 | evdev->dev.parent = &dev->dev; | |
9657d75c DT |
1138 | evdev->dev.release = evdev_free; |
1139 | device_initialize(&evdev->dev); | |
5b2a0826 | 1140 | |
6addb1d6 | 1141 | error = input_register_handle(&evdev->handle); |
5b2a0826 | 1142 | if (error) |
9657d75c | 1143 | goto err_free_evdev; |
5b2a0826 | 1144 | |
7f8d4cad | 1145 | cdev_init(&evdev->cdev, &evdev_fops); |
4a215aad | 1146 | evdev->cdev.kobj.parent = &evdev->dev.kobj; |
7f8d4cad | 1147 | error = cdev_add(&evdev->cdev, evdev->dev.devt, 1); |
6addb1d6 DT |
1148 | if (error) |
1149 | goto err_unregister_handle; | |
1150 | ||
1151 | error = device_add(&evdev->dev); | |
5b2a0826 | 1152 | if (error) |
6addb1d6 | 1153 | goto err_cleanup_evdev; |
1da177e4 | 1154 | |
5b2a0826 | 1155 | return 0; |
1da177e4 | 1156 | |
6addb1d6 DT |
1157 | err_cleanup_evdev: |
1158 | evdev_cleanup(evdev); | |
1159 | err_unregister_handle: | |
1160 | input_unregister_handle(&evdev->handle); | |
5b2a0826 | 1161 | err_free_evdev: |
9657d75c | 1162 | put_device(&evdev->dev); |
7f8d4cad DT |
1163 | err_free_minor: |
1164 | input_free_minor(minor); | |
5b2a0826 | 1165 | return error; |
1da177e4 LT |
1166 | } |
1167 | ||
1168 | static void evdev_disconnect(struct input_handle *handle) | |
1169 | { | |
1170 | struct evdev *evdev = handle->private; | |
1da177e4 | 1171 | |
9657d75c | 1172 | device_del(&evdev->dev); |
6addb1d6 | 1173 | evdev_cleanup(evdev); |
7f8d4cad | 1174 | input_free_minor(MINOR(evdev->dev.devt)); |
6addb1d6 | 1175 | input_unregister_handle(handle); |
9657d75c | 1176 | put_device(&evdev->dev); |
1da177e4 LT |
1177 | } |
1178 | ||
66e66118 | 1179 | static const struct input_device_id evdev_ids[] = { |
1da177e4 LT |
1180 | { .driver_info = 1 }, /* Matches all devices */ |
1181 | { }, /* Terminating zero entry */ | |
1182 | }; | |
1183 | ||
1184 | MODULE_DEVICE_TABLE(input, evdev_ids); | |
1185 | ||
1186 | static struct input_handler evdev_handler = { | |
6addb1d6 | 1187 | .event = evdev_event, |
a274ac15 | 1188 | .events = evdev_events, |
6addb1d6 DT |
1189 | .connect = evdev_connect, |
1190 | .disconnect = evdev_disconnect, | |
7f8d4cad | 1191 | .legacy_minors = true, |
6addb1d6 DT |
1192 | .minor = EVDEV_MINOR_BASE, |
1193 | .name = "evdev", | |
1194 | .id_table = evdev_ids, | |
1da177e4 LT |
1195 | }; |
1196 | ||
1197 | static int __init evdev_init(void) | |
1198 | { | |
4263cf0f | 1199 | return input_register_handler(&evdev_handler); |
1da177e4 LT |
1200 | } |
1201 | ||
1202 | static void __exit evdev_exit(void) | |
1203 | { | |
1204 | input_unregister_handler(&evdev_handler); | |
1205 | } | |
1206 | ||
1207 | module_init(evdev_init); | |
1208 | module_exit(evdev_exit); | |
1209 | ||
1210 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
1211 | MODULE_DESCRIPTION("Input driver event char devices"); | |
1212 | MODULE_LICENSE("GPL"); |