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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 | 30 | |
aac8bcf1 AM |
31 | enum evdev_clock_type { |
32 | EV_CLK_REAL = 0, | |
33 | EV_CLK_MONO, | |
34 | EV_CLK_BOOT, | |
35 | EV_CLK_MAX | |
36 | }; | |
37 | ||
1da177e4 | 38 | struct evdev { |
1da177e4 | 39 | int open; |
1da177e4 LT |
40 | struct input_handle handle; |
41 | wait_queue_head_t wait; | |
2be85279 | 42 | struct evdev_client __rcu *grab; |
d0ffb9be | 43 | struct list_head client_list; |
6addb1d6 DT |
44 | spinlock_t client_lock; /* protects client_list */ |
45 | struct mutex mutex; | |
9657d75c | 46 | struct device dev; |
7f8d4cad | 47 | struct cdev cdev; |
20da92de | 48 | bool exist; |
1da177e4 LT |
49 | }; |
50 | ||
d0ffb9be | 51 | struct evdev_client { |
9fb0f14e JB |
52 | unsigned int head; |
53 | unsigned int tail; | |
cdda911c | 54 | unsigned int packet_head; /* [future] position of the first element of next packet */ |
6addb1d6 | 55 | spinlock_t buffer_lock; /* protects access to buffer, head and tail */ |
1da177e4 LT |
56 | struct fasync_struct *fasync; |
57 | struct evdev *evdev; | |
58 | struct list_head node; | |
aac8bcf1 | 59 | int clk_type; |
c7dc6573 | 60 | bool revoked; |
9fb0f14e | 61 | unsigned int bufsize; |
b58f7086 | 62 | struct input_event buffer[]; |
1da177e4 LT |
63 | }; |
64 | ||
48318028 DH |
65 | /* flush queued events of type @type, caller must hold client->buffer_lock */ |
66 | static void __evdev_flush_queue(struct evdev_client *client, unsigned int type) | |
67 | { | |
68 | unsigned int i, head, num; | |
69 | unsigned int mask = client->bufsize - 1; | |
70 | bool is_report; | |
71 | struct input_event *ev; | |
72 | ||
73 | BUG_ON(type == EV_SYN); | |
74 | ||
75 | head = client->tail; | |
76 | client->packet_head = client->tail; | |
77 | ||
78 | /* init to 1 so a leading SYN_REPORT will not be dropped */ | |
79 | num = 1; | |
80 | ||
81 | for (i = client->tail; i != client->head; i = (i + 1) & mask) { | |
82 | ev = &client->buffer[i]; | |
83 | is_report = ev->type == EV_SYN && ev->code == SYN_REPORT; | |
84 | ||
85 | if (ev->type == type) { | |
86 | /* drop matched entry */ | |
87 | continue; | |
88 | } else if (is_report && !num) { | |
89 | /* drop empty SYN_REPORT groups */ | |
90 | continue; | |
91 | } else if (head != i) { | |
92 | /* move entry to fill the gap */ | |
93 | client->buffer[head].time = ev->time; | |
94 | client->buffer[head].type = ev->type; | |
95 | client->buffer[head].code = ev->code; | |
96 | client->buffer[head].value = ev->value; | |
97 | } | |
98 | ||
99 | num++; | |
100 | head = (head + 1) & mask; | |
101 | ||
102 | if (is_report) { | |
103 | num = 0; | |
104 | client->packet_head = head; | |
105 | } | |
106 | } | |
107 | ||
108 | client->head = head; | |
109 | } | |
110 | ||
b881d537 | 111 | static void __evdev_queue_syn_dropped(struct evdev_client *client) |
48318028 | 112 | { |
48318028 DH |
113 | struct input_event ev; |
114 | ktime_t time; | |
115 | ||
aac8bcf1 AM |
116 | time = client->clk_type == EV_CLK_REAL ? |
117 | ktime_get_real() : | |
118 | client->clk_type == EV_CLK_MONO ? | |
119 | ktime_get() : | |
120 | ktime_get_boottime(); | |
48318028 DH |
121 | |
122 | ev.time = ktime_to_timeval(time); | |
123 | ev.type = EV_SYN; | |
124 | ev.code = SYN_DROPPED; | |
125 | ev.value = 0; | |
126 | ||
48318028 DH |
127 | client->buffer[client->head++] = ev; |
128 | client->head &= client->bufsize - 1; | |
129 | ||
130 | if (unlikely(client->head == client->tail)) { | |
131 | /* drop queue but keep our SYN_DROPPED event */ | |
132 | client->tail = (client->head - 1) & (client->bufsize - 1); | |
133 | client->packet_head = client->tail; | |
134 | } | |
b881d537 DT |
135 | } |
136 | ||
137 | static void evdev_queue_syn_dropped(struct evdev_client *client) | |
138 | { | |
139 | unsigned long flags; | |
48318028 | 140 | |
b881d537 DT |
141 | spin_lock_irqsave(&client->buffer_lock, flags); |
142 | __evdev_queue_syn_dropped(client); | |
48318028 DH |
143 | spin_unlock_irqrestore(&client->buffer_lock, flags); |
144 | } | |
145 | ||
0c3e9943 AG |
146 | static int evdev_set_clk_type(struct evdev_client *client, unsigned int clkid) |
147 | { | |
b881d537 DT |
148 | unsigned long flags; |
149 | ||
0c3e9943 AG |
150 | if (client->clk_type == clkid) |
151 | return 0; | |
152 | ||
153 | switch (clkid) { | |
154 | ||
155 | case CLOCK_REALTIME: | |
156 | client->clk_type = EV_CLK_REAL; | |
157 | break; | |
158 | case CLOCK_MONOTONIC: | |
159 | client->clk_type = EV_CLK_MONO; | |
160 | break; | |
161 | case CLOCK_BOOTTIME: | |
162 | client->clk_type = EV_CLK_BOOT; | |
163 | break; | |
164 | default: | |
165 | return -EINVAL; | |
166 | } | |
167 | ||
b881d537 DT |
168 | /* |
169 | * Flush pending events and queue SYN_DROPPED event, | |
170 | * but only if the queue is not empty. | |
171 | */ | |
172 | spin_lock_irqsave(&client->buffer_lock, flags); | |
173 | ||
174 | if (client->head != client->tail) { | |
175 | client->packet_head = client->head = client->tail; | |
176 | __evdev_queue_syn_dropped(client); | |
177 | } | |
178 | ||
179 | spin_unlock_irqrestore(&client->buffer_lock, flags); | |
0c3e9943 AG |
180 | |
181 | return 0; | |
182 | } | |
183 | ||
a274ac15 HR |
184 | static void __pass_event(struct evdev_client *client, |
185 | const struct input_event *event) | |
6addb1d6 | 186 | { |
9fb0f14e JB |
187 | client->buffer[client->head++] = *event; |
188 | client->head &= client->bufsize - 1; | |
189 | ||
190 | if (unlikely(client->head == client->tail)) { | |
191 | /* | |
192 | * This effectively "drops" all unconsumed events, leaving | |
193 | * EV_SYN/SYN_DROPPED plus the newest event in the queue. | |
194 | */ | |
195 | client->tail = (client->head - 2) & (client->bufsize - 1); | |
196 | ||
197 | client->buffer[client->tail].time = event->time; | |
198 | client->buffer[client->tail].type = EV_SYN; | |
199 | client->buffer[client->tail].code = SYN_DROPPED; | |
200 | client->buffer[client->tail].value = 0; | |
9fb0f14e | 201 | |
cdda911c JB |
202 | client->packet_head = client->tail; |
203 | } | |
6addb1d6 | 204 | |
cdda911c JB |
205 | if (event->type == EV_SYN && event->code == SYN_REPORT) { |
206 | client->packet_head = client->head; | |
30a589fd | 207 | kill_fasync(&client->fasync, SIGIO, POLL_IN); |
cdda911c | 208 | } |
a274ac15 HR |
209 | } |
210 | ||
211 | static void evdev_pass_values(struct evdev_client *client, | |
212 | const struct input_value *vals, unsigned int count, | |
aac8bcf1 | 213 | ktime_t *ev_time) |
a274ac15 HR |
214 | { |
215 | struct evdev *evdev = client->evdev; | |
216 | const struct input_value *v; | |
217 | struct input_event event; | |
218 | bool wakeup = false; | |
219 | ||
c7dc6573 DH |
220 | if (client->revoked) |
221 | return; | |
222 | ||
aac8bcf1 | 223 | event.time = ktime_to_timeval(ev_time[client->clk_type]); |
a274ac15 HR |
224 | |
225 | /* Interrupts are disabled, just acquire the lock. */ | |
226 | spin_lock(&client->buffer_lock); | |
227 | ||
228 | for (v = vals; v != vals + count; v++) { | |
229 | event.type = v->type; | |
230 | event.code = v->code; | |
231 | event.value = v->value; | |
232 | __pass_event(client, &event); | |
233 | if (v->type == EV_SYN && v->code == SYN_REPORT) | |
234 | wakeup = true; | |
235 | } | |
cdda911c JB |
236 | |
237 | spin_unlock(&client->buffer_lock); | |
a274ac15 HR |
238 | |
239 | if (wakeup) | |
240 | wake_up_interruptible(&evdev->wait); | |
6addb1d6 DT |
241 | } |
242 | ||
243 | /* | |
a274ac15 | 244 | * Pass incoming events to all connected clients. |
6addb1d6 | 245 | */ |
a274ac15 HR |
246 | static void evdev_events(struct input_handle *handle, |
247 | const struct input_value *vals, unsigned int count) | |
1da177e4 LT |
248 | { |
249 | struct evdev *evdev = handle->private; | |
d0ffb9be | 250 | struct evdev_client *client; |
aac8bcf1 | 251 | ktime_t ev_time[EV_CLK_MAX]; |
a80b83b7 | 252 | |
aac8bcf1 AM |
253 | ev_time[EV_CLK_MONO] = ktime_get(); |
254 | ev_time[EV_CLK_REAL] = ktime_mono_to_real(ev_time[EV_CLK_MONO]); | |
255 | ev_time[EV_CLK_BOOT] = ktime_mono_to_any(ev_time[EV_CLK_MONO], | |
256 | TK_OFFS_BOOT); | |
1da177e4 | 257 | |
82ba56c2 DT |
258 | rcu_read_lock(); |
259 | ||
6addb1d6 | 260 | client = rcu_dereference(evdev->grab); |
a80b83b7 | 261 | |
6addb1d6 | 262 | if (client) |
aac8bcf1 | 263 | evdev_pass_values(client, vals, count, ev_time); |
6addb1d6 DT |
264 | else |
265 | list_for_each_entry_rcu(client, &evdev->client_list, node) | |
aac8bcf1 | 266 | evdev_pass_values(client, vals, count, ev_time); |
1da177e4 | 267 | |
82ba56c2 | 268 | rcu_read_unlock(); |
a274ac15 | 269 | } |
82ba56c2 | 270 | |
a274ac15 HR |
271 | /* |
272 | * Pass incoming event to all connected clients. | |
273 | */ | |
274 | static void evdev_event(struct input_handle *handle, | |
275 | unsigned int type, unsigned int code, int value) | |
276 | { | |
277 | struct input_value vals[] = { { type, code, value } }; | |
278 | ||
279 | evdev_events(handle, vals, 1); | |
1da177e4 LT |
280 | } |
281 | ||
282 | static int evdev_fasync(int fd, struct file *file, int on) | |
283 | { | |
d0ffb9be | 284 | struct evdev_client *client = file->private_data; |
1e0afb28 | 285 | |
60aa4924 | 286 | return fasync_helper(fd, file, on, &client->fasync); |
1da177e4 LT |
287 | } |
288 | ||
1e0afb28 | 289 | static int evdev_flush(struct file *file, fl_owner_t id) |
1da177e4 | 290 | { |
d0ffb9be DT |
291 | struct evdev_client *client = file->private_data; |
292 | struct evdev *evdev = client->evdev; | |
6addb1d6 DT |
293 | int retval; |
294 | ||
295 | retval = mutex_lock_interruptible(&evdev->mutex); | |
296 | if (retval) | |
297 | return retval; | |
1e0afb28 | 298 | |
c7dc6573 | 299 | if (!evdev->exist || client->revoked) |
6addb1d6 DT |
300 | retval = -ENODEV; |
301 | else | |
302 | retval = input_flush_device(&evdev->handle, file); | |
1e0afb28 | 303 | |
6addb1d6 DT |
304 | mutex_unlock(&evdev->mutex); |
305 | return retval; | |
1da177e4 LT |
306 | } |
307 | ||
9657d75c | 308 | static void evdev_free(struct device *dev) |
1da177e4 | 309 | { |
9657d75c DT |
310 | struct evdev *evdev = container_of(dev, struct evdev, dev); |
311 | ||
a7097ff8 | 312 | input_put_device(evdev->handle.dev); |
1da177e4 LT |
313 | kfree(evdev); |
314 | } | |
315 | ||
6addb1d6 DT |
316 | /* |
317 | * Grabs an event device (along with underlying input device). | |
318 | * This function is called with evdev->mutex taken. | |
319 | */ | |
320 | static int evdev_grab(struct evdev *evdev, struct evdev_client *client) | |
321 | { | |
322 | int error; | |
323 | ||
324 | if (evdev->grab) | |
325 | return -EBUSY; | |
326 | ||
327 | error = input_grab_device(&evdev->handle); | |
328 | if (error) | |
329 | return error; | |
330 | ||
331 | rcu_assign_pointer(evdev->grab, client); | |
6addb1d6 DT |
332 | |
333 | return 0; | |
334 | } | |
335 | ||
336 | static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client) | |
337 | { | |
dba42580 DT |
338 | struct evdev_client *grab = rcu_dereference_protected(evdev->grab, |
339 | lockdep_is_held(&evdev->mutex)); | |
340 | ||
341 | if (grab != client) | |
6addb1d6 DT |
342 | return -EINVAL; |
343 | ||
344 | rcu_assign_pointer(evdev->grab, NULL); | |
82ba56c2 | 345 | synchronize_rcu(); |
6addb1d6 DT |
346 | input_release_device(&evdev->handle); |
347 | ||
348 | return 0; | |
349 | } | |
350 | ||
351 | static void evdev_attach_client(struct evdev *evdev, | |
352 | struct evdev_client *client) | |
353 | { | |
354 | spin_lock(&evdev->client_lock); | |
355 | list_add_tail_rcu(&client->node, &evdev->client_list); | |
356 | spin_unlock(&evdev->client_lock); | |
6addb1d6 DT |
357 | } |
358 | ||
359 | static void evdev_detach_client(struct evdev *evdev, | |
360 | struct evdev_client *client) | |
361 | { | |
362 | spin_lock(&evdev->client_lock); | |
363 | list_del_rcu(&client->node); | |
364 | spin_unlock(&evdev->client_lock); | |
82ba56c2 | 365 | synchronize_rcu(); |
6addb1d6 DT |
366 | } |
367 | ||
368 | static int evdev_open_device(struct evdev *evdev) | |
369 | { | |
370 | int retval; | |
371 | ||
372 | retval = mutex_lock_interruptible(&evdev->mutex); | |
373 | if (retval) | |
374 | return retval; | |
375 | ||
376 | if (!evdev->exist) | |
377 | retval = -ENODEV; | |
06445014 | 378 | else if (!evdev->open++) { |
6addb1d6 | 379 | retval = input_open_device(&evdev->handle); |
06445014 ON |
380 | if (retval) |
381 | evdev->open--; | |
382 | } | |
6addb1d6 DT |
383 | |
384 | mutex_unlock(&evdev->mutex); | |
385 | return retval; | |
386 | } | |
387 | ||
388 | static void evdev_close_device(struct evdev *evdev) | |
389 | { | |
390 | mutex_lock(&evdev->mutex); | |
391 | ||
392 | if (evdev->exist && !--evdev->open) | |
393 | input_close_device(&evdev->handle); | |
394 | ||
395 | mutex_unlock(&evdev->mutex); | |
396 | } | |
397 | ||
398 | /* | |
399 | * Wake up users waiting for IO so they can disconnect from | |
400 | * dead device. | |
401 | */ | |
402 | static void evdev_hangup(struct evdev *evdev) | |
403 | { | |
404 | struct evdev_client *client; | |
405 | ||
406 | spin_lock(&evdev->client_lock); | |
407 | list_for_each_entry(client, &evdev->client_list, node) | |
408 | kill_fasync(&client->fasync, SIGIO, POLL_HUP); | |
409 | spin_unlock(&evdev->client_lock); | |
410 | ||
411 | wake_up_interruptible(&evdev->wait); | |
412 | } | |
413 | ||
d0ffb9be | 414 | static int evdev_release(struct inode *inode, struct file *file) |
1da177e4 | 415 | { |
d0ffb9be DT |
416 | struct evdev_client *client = file->private_data; |
417 | struct evdev *evdev = client->evdev; | |
1da177e4 | 418 | |
6addb1d6 | 419 | mutex_lock(&evdev->mutex); |
dba42580 | 420 | evdev_ungrab(evdev, client); |
6addb1d6 | 421 | mutex_unlock(&evdev->mutex); |
1da177e4 | 422 | |
6addb1d6 | 423 | evdev_detach_client(evdev, client); |
92eb77d0 DS |
424 | |
425 | if (is_vmalloc_addr(client)) | |
426 | vfree(client); | |
427 | else | |
428 | kfree(client); | |
1da177e4 | 429 | |
6addb1d6 | 430 | evdev_close_device(evdev); |
1da177e4 | 431 | |
1da177e4 LT |
432 | return 0; |
433 | } | |
434 | ||
b58f7086 HR |
435 | static unsigned int evdev_compute_buffer_size(struct input_dev *dev) |
436 | { | |
63a6404d HR |
437 | unsigned int n_events = |
438 | max(dev->hint_events_per_packet * EVDEV_BUF_PACKETS, | |
439 | EVDEV_MIN_BUFFER_SIZE); | |
440 | ||
441 | return roundup_pow_of_two(n_events); | |
b58f7086 HR |
442 | } |
443 | ||
d0ffb9be | 444 | static int evdev_open(struct inode *inode, struct file *file) |
1da177e4 | 445 | { |
7f8d4cad DT |
446 | struct evdev *evdev = container_of(inode->i_cdev, struct evdev, cdev); |
447 | unsigned int bufsize = evdev_compute_buffer_size(evdev->handle.dev); | |
92eb77d0 DS |
448 | unsigned int size = sizeof(struct evdev_client) + |
449 | bufsize * sizeof(struct input_event); | |
6addb1d6 | 450 | struct evdev_client *client; |
d542ed82 | 451 | int error; |
1da177e4 | 452 | |
92eb77d0 DS |
453 | client = kzalloc(size, GFP_KERNEL | __GFP_NOWARN); |
454 | if (!client) | |
455 | client = vzalloc(size); | |
7f8d4cad DT |
456 | if (!client) |
457 | return -ENOMEM; | |
1da177e4 | 458 | |
b58f7086 | 459 | client->bufsize = bufsize; |
6addb1d6 | 460 | spin_lock_init(&client->buffer_lock); |
d0ffb9be | 461 | client->evdev = evdev; |
6addb1d6 | 462 | evdev_attach_client(evdev, client); |
1da177e4 | 463 | |
6addb1d6 DT |
464 | error = evdev_open_device(evdev); |
465 | if (error) | |
466 | goto err_free_client; | |
1da177e4 | 467 | |
d0ffb9be | 468 | file->private_data = client; |
3d7bbd45 DT |
469 | nonseekable_open(inode, file); |
470 | ||
1da177e4 | 471 | return 0; |
9657d75c DT |
472 | |
473 | err_free_client: | |
6addb1d6 | 474 | evdev_detach_client(evdev, client); |
92788ac1 | 475 | kvfree(client); |
9657d75c | 476 | return error; |
1da177e4 LT |
477 | } |
478 | ||
6addb1d6 DT |
479 | static ssize_t evdev_write(struct file *file, const char __user *buffer, |
480 | size_t count, loff_t *ppos) | |
3a51f7c4 | 481 | { |
d0ffb9be DT |
482 | struct evdev_client *client = file->private_data; |
483 | struct evdev *evdev = client->evdev; | |
3a51f7c4 | 484 | struct input_event event; |
02dfc496 | 485 | int retval = 0; |
52658bb6 | 486 | |
2872a9b5 | 487 | if (count != 0 && count < input_event_size()) |
439581ec PK |
488 | return -EINVAL; |
489 | ||
6addb1d6 DT |
490 | retval = mutex_lock_interruptible(&evdev->mutex); |
491 | if (retval) | |
492 | return retval; | |
493 | ||
c7dc6573 | 494 | if (!evdev->exist || client->revoked) { |
6addb1d6 DT |
495 | retval = -ENODEV; |
496 | goto out; | |
497 | } | |
52658bb6 | 498 | |
2872a9b5 DT |
499 | while (retval + input_event_size() <= count) { |
500 | ||
2d56f3a3 | 501 | if (input_event_from_user(buffer + retval, &event)) { |
6addb1d6 DT |
502 | retval = -EFAULT; |
503 | goto out; | |
504 | } | |
439581ec | 505 | retval += input_event_size(); |
6addb1d6 DT |
506 | |
507 | input_inject_event(&evdev->handle, | |
508 | event.type, event.code, event.value); | |
2872a9b5 | 509 | } |
52658bb6 | 510 | |
6addb1d6 DT |
511 | out: |
512 | mutex_unlock(&evdev->mutex); | |
52658bb6 JK |
513 | return retval; |
514 | } | |
52658bb6 | 515 | |
6addb1d6 DT |
516 | static int evdev_fetch_next_event(struct evdev_client *client, |
517 | struct input_event *event) | |
518 | { | |
519 | int have_event; | |
520 | ||
521 | spin_lock_irq(&client->buffer_lock); | |
522 | ||
566cf5b6 | 523 | have_event = client->packet_head != client->tail; |
6addb1d6 DT |
524 | if (have_event) { |
525 | *event = client->buffer[client->tail++]; | |
b58f7086 | 526 | client->tail &= client->bufsize - 1; |
6addb1d6 DT |
527 | } |
528 | ||
529 | spin_unlock_irq(&client->buffer_lock); | |
530 | ||
531 | return have_event; | |
532 | } | |
533 | ||
534 | static ssize_t evdev_read(struct file *file, char __user *buffer, | |
535 | size_t count, loff_t *ppos) | |
1da177e4 | 536 | { |
d0ffb9be DT |
537 | struct evdev_client *client = file->private_data; |
538 | struct evdev *evdev = client->evdev; | |
6addb1d6 | 539 | struct input_event event; |
2872a9b5 DT |
540 | size_t read = 0; |
541 | int error; | |
1da177e4 | 542 | |
2872a9b5 | 543 | if (count != 0 && count < input_event_size()) |
1da177e4 LT |
544 | return -EINVAL; |
545 | ||
2872a9b5 | 546 | for (;;) { |
c7dc6573 | 547 | if (!evdev->exist || client->revoked) |
2872a9b5 | 548 | return -ENODEV; |
1da177e4 | 549 | |
2872a9b5 DT |
550 | if (client->packet_head == client->tail && |
551 | (file->f_flags & O_NONBLOCK)) | |
552 | return -EAGAIN; | |
553 | ||
554 | /* | |
555 | * count == 0 is special - no IO is done but we check | |
556 | * for error conditions (see above). | |
557 | */ | |
558 | if (count == 0) | |
559 | break; | |
1da177e4 | 560 | |
2872a9b5 DT |
561 | while (read + input_event_size() <= count && |
562 | evdev_fetch_next_event(client, &event)) { | |
3a51f7c4 | 563 | |
2872a9b5 DT |
564 | if (input_event_to_user(buffer + read, &event)) |
565 | return -EFAULT; | |
3a51f7c4 | 566 | |
2872a9b5 DT |
567 | read += input_event_size(); |
568 | } | |
1da177e4 | 569 | |
2872a9b5 DT |
570 | if (read) |
571 | break; | |
e90f869c | 572 | |
2872a9b5 DT |
573 | if (!(file->f_flags & O_NONBLOCK)) { |
574 | error = wait_event_interruptible(evdev->wait, | |
575 | client->packet_head != client->tail || | |
c7dc6573 | 576 | !evdev->exist || client->revoked); |
2872a9b5 DT |
577 | if (error) |
578 | return error; | |
579 | } | |
580 | } | |
581 | ||
582 | return read; | |
1da177e4 LT |
583 | } |
584 | ||
585 | /* No kernel lock - fine */ | |
586 | static unsigned int evdev_poll(struct file *file, poll_table *wait) | |
587 | { | |
d0ffb9be DT |
588 | struct evdev_client *client = file->private_data; |
589 | struct evdev *evdev = client->evdev; | |
c18fb139 | 590 | unsigned int mask; |
1e0afb28 | 591 | |
d0ffb9be | 592 | poll_wait(file, &evdev->wait, wait); |
c18fb139 | 593 | |
c7dc6573 DH |
594 | if (evdev->exist && !client->revoked) |
595 | mask = POLLOUT | POLLWRNORM; | |
596 | else | |
597 | mask = POLLHUP | POLLERR; | |
598 | ||
cdda911c | 599 | if (client->packet_head != client->tail) |
c18fb139 DT |
600 | mask |= POLLIN | POLLRDNORM; |
601 | ||
602 | return mask; | |
1da177e4 LT |
603 | } |
604 | ||
3a51f7c4 DT |
605 | #ifdef CONFIG_COMPAT |
606 | ||
607 | #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) | |
7b19ada2 | 608 | #define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1) |
3a51f7c4 DT |
609 | |
610 | #ifdef __BIG_ENDIAN | |
611 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
612 | unsigned int maxlen, void __user *p, int compat) | |
613 | { | |
614 | int len, i; | |
615 | ||
616 | if (compat) { | |
7b19ada2 | 617 | len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t); |
bf61f8d3 | 618 | if (len > maxlen) |
3a51f7c4 DT |
619 | len = maxlen; |
620 | ||
621 | for (i = 0; i < len / sizeof(compat_long_t); i++) | |
622 | if (copy_to_user((compat_long_t __user *) p + i, | |
623 | (compat_long_t *) bits + | |
624 | i + 1 - ((i % 2) << 1), | |
625 | sizeof(compat_long_t))) | |
626 | return -EFAULT; | |
627 | } else { | |
7b19ada2 | 628 | len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
629 | if (len > maxlen) |
630 | len = maxlen; | |
631 | ||
632 | if (copy_to_user(p, bits, len)) | |
633 | return -EFAULT; | |
634 | } | |
635 | ||
636 | return len; | |
637 | } | |
638 | #else | |
639 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
640 | unsigned int maxlen, void __user *p, int compat) | |
641 | { | |
642 | int len = compat ? | |
7b19ada2 JS |
643 | BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) : |
644 | BITS_TO_LONGS(maxbit) * sizeof(long); | |
3a51f7c4 DT |
645 | |
646 | if (len > maxlen) | |
647 | len = maxlen; | |
648 | ||
649 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
650 | } | |
651 | #endif /* __BIG_ENDIAN */ | |
652 | ||
653 | #else | |
654 | ||
655 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
656 | unsigned int maxlen, void __user *p, int compat) | |
657 | { | |
7b19ada2 | 658 | int len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
659 | |
660 | if (len > maxlen) | |
661 | len = maxlen; | |
662 | ||
663 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
664 | } | |
665 | ||
666 | #endif /* CONFIG_COMPAT */ | |
667 | ||
668 | static int str_to_user(const char *str, unsigned int maxlen, void __user *p) | |
669 | { | |
670 | int len; | |
671 | ||
672 | if (!str) | |
673 | return -ENOENT; | |
674 | ||
675 | len = strlen(str) + 1; | |
676 | if (len > maxlen) | |
677 | len = maxlen; | |
678 | ||
679 | return copy_to_user(p, str, len) ? -EFAULT : len; | |
680 | } | |
681 | ||
448cd166 DT |
682 | static int handle_eviocgbit(struct input_dev *dev, |
683 | unsigned int type, unsigned int size, | |
684 | void __user *p, int compat_mode) | |
5402a734 LT |
685 | { |
686 | unsigned long *bits; | |
687 | int len; | |
688 | ||
448cd166 | 689 | switch (type) { |
5402a734 LT |
690 | |
691 | case 0: bits = dev->evbit; len = EV_MAX; break; | |
692 | case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; | |
693 | case EV_REL: bits = dev->relbit; len = REL_MAX; break; | |
694 | case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; | |
695 | case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; | |
696 | case EV_LED: bits = dev->ledbit; len = LED_MAX; break; | |
697 | case EV_SND: bits = dev->sndbit; len = SND_MAX; break; | |
698 | case EV_FF: bits = dev->ffbit; len = FF_MAX; break; | |
699 | case EV_SW: bits = dev->swbit; len = SW_MAX; break; | |
700 | default: return -EINVAL; | |
701 | } | |
f2afa771 | 702 | |
448cd166 | 703 | return bits_to_user(bits, len, size, p, compat_mode); |
5402a734 | 704 | } |
5402a734 | 705 | |
ab4e0192 | 706 | static int evdev_handle_get_keycode(struct input_dev *dev, void __user *p) |
8613e4c2 | 707 | { |
ab4e0192 DT |
708 | struct input_keymap_entry ke = { |
709 | .len = sizeof(unsigned int), | |
710 | .flags = 0, | |
711 | }; | |
712 | int __user *ip = (int __user *)p; | |
8613e4c2 MCC |
713 | int error; |
714 | ||
ab4e0192 DT |
715 | /* legacy case */ |
716 | if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) | |
717 | return -EFAULT; | |
8613e4c2 | 718 | |
ab4e0192 DT |
719 | error = input_get_keycode(dev, &ke); |
720 | if (error) | |
721 | return error; | |
8613e4c2 | 722 | |
ab4e0192 DT |
723 | if (put_user(ke.keycode, ip + 1)) |
724 | return -EFAULT; | |
8613e4c2 | 725 | |
ab4e0192 DT |
726 | return 0; |
727 | } | |
8613e4c2 | 728 | |
ab4e0192 DT |
729 | static int evdev_handle_get_keycode_v2(struct input_dev *dev, void __user *p) |
730 | { | |
731 | struct input_keymap_entry ke; | |
732 | int error; | |
8613e4c2 | 733 | |
ab4e0192 DT |
734 | if (copy_from_user(&ke, p, sizeof(ke))) |
735 | return -EFAULT; | |
8613e4c2 | 736 | |
ab4e0192 DT |
737 | error = input_get_keycode(dev, &ke); |
738 | if (error) | |
739 | return error; | |
8613e4c2 | 740 | |
ab4e0192 DT |
741 | if (copy_to_user(p, &ke, sizeof(ke))) |
742 | return -EFAULT; | |
8613e4c2 | 743 | |
8613e4c2 MCC |
744 | return 0; |
745 | } | |
746 | ||
ab4e0192 | 747 | static int evdev_handle_set_keycode(struct input_dev *dev, void __user *p) |
8613e4c2 | 748 | { |
ab4e0192 DT |
749 | struct input_keymap_entry ke = { |
750 | .len = sizeof(unsigned int), | |
751 | .flags = 0, | |
752 | }; | |
753 | int __user *ip = (int __user *)p; | |
8613e4c2 | 754 | |
ab4e0192 DT |
755 | if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) |
756 | return -EFAULT; | |
8613e4c2 | 757 | |
ab4e0192 DT |
758 | if (get_user(ke.keycode, ip + 1)) |
759 | return -EFAULT; | |
8613e4c2 | 760 | |
ab4e0192 DT |
761 | return input_set_keycode(dev, &ke); |
762 | } | |
8613e4c2 | 763 | |
ab4e0192 DT |
764 | static int evdev_handle_set_keycode_v2(struct input_dev *dev, void __user *p) |
765 | { | |
766 | struct input_keymap_entry ke; | |
8613e4c2 | 767 | |
ab4e0192 DT |
768 | if (copy_from_user(&ke, p, sizeof(ke))) |
769 | return -EFAULT; | |
8613e4c2 | 770 | |
ab4e0192 DT |
771 | if (ke.len > sizeof(ke.scancode)) |
772 | return -EINVAL; | |
8613e4c2 MCC |
773 | |
774 | return input_set_keycode(dev, &ke); | |
775 | } | |
776 | ||
48318028 DH |
777 | /* |
778 | * If we transfer state to the user, we should flush all pending events | |
779 | * of the same type from the client's queue. Otherwise, they might end up | |
780 | * with duplicate events, which can screw up client's state tracking. | |
781 | * If bits_to_user fails after flushing the queue, we queue a SYN_DROPPED | |
782 | * event so user-space will notice missing events. | |
783 | * | |
784 | * LOCKING: | |
785 | * We need to take event_lock before buffer_lock to avoid dead-locks. But we | |
786 | * need the even_lock only to guarantee consistent state. We can safely release | |
787 | * it while flushing the queue. This allows input-core to handle filters while | |
788 | * we flush the queue. | |
789 | */ | |
790 | static int evdev_handle_get_val(struct evdev_client *client, | |
791 | struct input_dev *dev, unsigned int type, | |
7c4f5607 DT |
792 | unsigned long *bits, unsigned int maxbit, |
793 | unsigned int maxlen, void __user *p, | |
794 | int compat) | |
48318028 DH |
795 | { |
796 | int ret; | |
797 | unsigned long *mem; | |
7c4f5607 | 798 | size_t len; |
48318028 | 799 | |
7c4f5607 DT |
800 | len = BITS_TO_LONGS(maxbit) * sizeof(unsigned long); |
801 | mem = kmalloc(len, GFP_KERNEL); | |
48318028 DH |
802 | if (!mem) |
803 | return -ENOMEM; | |
804 | ||
805 | spin_lock_irq(&dev->event_lock); | |
806 | spin_lock(&client->buffer_lock); | |
807 | ||
7c4f5607 | 808 | memcpy(mem, bits, len); |
48318028 DH |
809 | |
810 | spin_unlock(&dev->event_lock); | |
811 | ||
812 | __evdev_flush_queue(client, type); | |
813 | ||
814 | spin_unlock_irq(&client->buffer_lock); | |
815 | ||
7c4f5607 | 816 | ret = bits_to_user(mem, maxbit, maxlen, p, compat); |
48318028 | 817 | if (ret < 0) |
b881d537 | 818 | evdev_queue_syn_dropped(client); |
48318028 DH |
819 | |
820 | kfree(mem); | |
821 | ||
822 | return ret; | |
823 | } | |
824 | ||
1cf0c6e6 HR |
825 | static int evdev_handle_mt_request(struct input_dev *dev, |
826 | unsigned int size, | |
827 | int __user *ip) | |
828 | { | |
8d18fba2 | 829 | const struct input_mt *mt = dev->mt; |
1cf0c6e6 HR |
830 | unsigned int code; |
831 | int max_slots; | |
832 | int i; | |
833 | ||
834 | if (get_user(code, &ip[0])) | |
835 | return -EFAULT; | |
8d18fba2 | 836 | if (!mt || !input_is_mt_value(code)) |
1cf0c6e6 HR |
837 | return -EINVAL; |
838 | ||
839 | max_slots = (size - sizeof(__u32)) / sizeof(__s32); | |
8d18fba2 HR |
840 | for (i = 0; i < mt->num_slots && i < max_slots; i++) { |
841 | int value = input_mt_get_value(&mt->slots[i], code); | |
842 | if (put_user(value, &ip[1 + i])) | |
1cf0c6e6 | 843 | return -EFAULT; |
8d18fba2 | 844 | } |
1cf0c6e6 HR |
845 | |
846 | return 0; | |
847 | } | |
848 | ||
c7dc6573 DH |
849 | static int evdev_revoke(struct evdev *evdev, struct evdev_client *client, |
850 | struct file *file) | |
851 | { | |
852 | client->revoked = true; | |
853 | evdev_ungrab(evdev, client); | |
854 | input_flush_device(&evdev->handle, file); | |
855 | wake_up_interruptible(&evdev->wait); | |
856 | ||
857 | return 0; | |
858 | } | |
859 | ||
6addb1d6 DT |
860 | static long evdev_do_ioctl(struct file *file, unsigned int cmd, |
861 | void __user *p, int compat_mode) | |
1da177e4 | 862 | { |
d0ffb9be DT |
863 | struct evdev_client *client = file->private_data; |
864 | struct evdev *evdev = client->evdev; | |
1da177e4 LT |
865 | struct input_dev *dev = evdev->handle.dev; |
866 | struct input_absinfo abs; | |
509ca1a9 | 867 | struct ff_effect effect; |
3a51f7c4 | 868 | int __user *ip = (int __user *)p; |
58b93995 | 869 | unsigned int i, t, u, v; |
448cd166 | 870 | unsigned int size; |
509ca1a9 | 871 | int error; |
1da177e4 | 872 | |
448cd166 | 873 | /* First we check for fixed-length commands */ |
1da177e4 LT |
874 | switch (cmd) { |
875 | ||
6addb1d6 DT |
876 | case EVIOCGVERSION: |
877 | return put_user(EV_VERSION, ip); | |
1da177e4 | 878 | |
6addb1d6 DT |
879 | case EVIOCGID: |
880 | if (copy_to_user(p, &dev->id, sizeof(struct input_id))) | |
881 | return -EFAULT; | |
882 | return 0; | |
08791e5c | 883 | |
6addb1d6 DT |
884 | case EVIOCGREP: |
885 | if (!test_bit(EV_REP, dev->evbit)) | |
886 | return -ENOSYS; | |
887 | if (put_user(dev->rep[REP_DELAY], ip)) | |
888 | return -EFAULT; | |
889 | if (put_user(dev->rep[REP_PERIOD], ip + 1)) | |
890 | return -EFAULT; | |
891 | return 0; | |
08791e5c | 892 | |
6addb1d6 DT |
893 | case EVIOCSREP: |
894 | if (!test_bit(EV_REP, dev->evbit)) | |
895 | return -ENOSYS; | |
896 | if (get_user(u, ip)) | |
897 | return -EFAULT; | |
898 | if (get_user(v, ip + 1)) | |
899 | return -EFAULT; | |
08791e5c | 900 | |
6addb1d6 DT |
901 | input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u); |
902 | input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v); | |
3a51f7c4 | 903 | |
6addb1d6 | 904 | return 0; |
1da177e4 | 905 | |
6addb1d6 DT |
906 | case EVIOCRMFF: |
907 | return input_ff_erase(dev, (int)(unsigned long) p, file); | |
1da177e4 | 908 | |
6addb1d6 DT |
909 | case EVIOCGEFFECTS: |
910 | i = test_bit(EV_FF, dev->evbit) ? | |
911 | dev->ff->max_effects : 0; | |
912 | if (put_user(i, ip)) | |
913 | return -EFAULT; | |
914 | return 0; | |
915 | ||
916 | case EVIOCGRAB: | |
917 | if (p) | |
918 | return evdev_grab(evdev, client); | |
919 | else | |
920 | return evdev_ungrab(evdev, client); | |
ab4e0192 | 921 | |
c7dc6573 DH |
922 | case EVIOCREVOKE: |
923 | if (p) | |
924 | return -EINVAL; | |
925 | else | |
926 | return evdev_revoke(evdev, client, file); | |
927 | ||
a80b83b7 JS |
928 | case EVIOCSCLOCKID: |
929 | if (copy_from_user(&i, p, sizeof(unsigned int))) | |
930 | return -EFAULT; | |
aac8bcf1 AM |
931 | |
932 | return evdev_set_clk_type(client, i); | |
a80b83b7 | 933 | |
ab4e0192 DT |
934 | case EVIOCGKEYCODE: |
935 | return evdev_handle_get_keycode(dev, p); | |
936 | ||
937 | case EVIOCSKEYCODE: | |
938 | return evdev_handle_set_keycode(dev, p); | |
939 | ||
940 | case EVIOCGKEYCODE_V2: | |
941 | return evdev_handle_get_keycode_v2(dev, p); | |
942 | ||
943 | case EVIOCSKEYCODE_V2: | |
944 | return evdev_handle_set_keycode_v2(dev, p); | |
448cd166 | 945 | } |
1da177e4 | 946 | |
448cd166 | 947 | size = _IOC_SIZE(cmd); |
1da177e4 | 948 | |
448cd166 DT |
949 | /* Now check variable-length commands */ |
950 | #define EVIOC_MASK_SIZE(nr) ((nr) & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) | |
448cd166 | 951 | switch (EVIOC_MASK_SIZE(cmd)) { |
41e979f8 | 952 | |
85b77200 HR |
953 | case EVIOCGPROP(0): |
954 | return bits_to_user(dev->propbit, INPUT_PROP_MAX, | |
955 | size, p, compat_mode); | |
956 | ||
1cf0c6e6 HR |
957 | case EVIOCGMTSLOTS(0): |
958 | return evdev_handle_mt_request(dev, size, ip); | |
959 | ||
448cd166 | 960 | case EVIOCGKEY(0): |
48318028 DH |
961 | return evdev_handle_get_val(client, dev, EV_KEY, dev->key, |
962 | KEY_MAX, size, p, compat_mode); | |
1da177e4 | 963 | |
448cd166 | 964 | case EVIOCGLED(0): |
48318028 DH |
965 | return evdev_handle_get_val(client, dev, EV_LED, dev->led, |
966 | LED_MAX, size, p, compat_mode); | |
1da177e4 | 967 | |
448cd166 | 968 | case EVIOCGSND(0): |
48318028 DH |
969 | return evdev_handle_get_val(client, dev, EV_SND, dev->snd, |
970 | SND_MAX, size, p, compat_mode); | |
1da177e4 | 971 | |
448cd166 | 972 | case EVIOCGSW(0): |
48318028 DH |
973 | return evdev_handle_get_val(client, dev, EV_SW, dev->sw, |
974 | SW_MAX, size, p, compat_mode); | |
31581066 | 975 | |
448cd166 DT |
976 | case EVIOCGNAME(0): |
977 | return str_to_user(dev->name, size, p); | |
1da177e4 | 978 | |
448cd166 DT |
979 | case EVIOCGPHYS(0): |
980 | return str_to_user(dev->phys, size, p); | |
1da177e4 | 981 | |
448cd166 DT |
982 | case EVIOCGUNIQ(0): |
983 | return str_to_user(dev->uniq, size, p); | |
1da177e4 | 984 | |
448cd166 DT |
985 | case EVIOC_MASK_SIZE(EVIOCSFF): |
986 | if (input_ff_effect_from_user(p, size, &effect)) | |
987 | return -EFAULT; | |
1da177e4 | 988 | |
448cd166 | 989 | error = input_ff_upload(dev, &effect, file); |
fc7392aa EV |
990 | if (error) |
991 | return error; | |
1da177e4 | 992 | |
448cd166 DT |
993 | if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) |
994 | return -EFAULT; | |
41e979f8 | 995 | |
fc7392aa | 996 | return 0; |
448cd166 | 997 | } |
1da177e4 | 998 | |
448cd166 DT |
999 | /* Multi-number variable-length handlers */ |
1000 | if (_IOC_TYPE(cmd) != 'E') | |
1001 | return -EINVAL; | |
1da177e4 | 1002 | |
448cd166 | 1003 | if (_IOC_DIR(cmd) == _IOC_READ) { |
6addb1d6 | 1004 | |
448cd166 DT |
1005 | if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0))) |
1006 | return handle_eviocgbit(dev, | |
1007 | _IOC_NR(cmd) & EV_MAX, size, | |
1008 | p, compat_mode); | |
1da177e4 | 1009 | |
448cd166 | 1010 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { |
f2278f31 | 1011 | |
0a74a1df DM |
1012 | if (!dev->absinfo) |
1013 | return -EINVAL; | |
1014 | ||
448cd166 DT |
1015 | t = _IOC_NR(cmd) & ABS_MAX; |
1016 | abs = dev->absinfo[t]; | |
f2278f31 | 1017 | |
448cd166 DT |
1018 | if (copy_to_user(p, &abs, min_t(size_t, |
1019 | size, sizeof(struct input_absinfo)))) | |
1020 | return -EFAULT; | |
f2278f31 | 1021 | |
448cd166 DT |
1022 | return 0; |
1023 | } | |
1024 | } | |
f2278f31 | 1025 | |
f9ce6eb5 | 1026 | if (_IOC_DIR(cmd) == _IOC_WRITE) { |
f2278f31 | 1027 | |
448cd166 | 1028 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { |
1da177e4 | 1029 | |
0a74a1df DM |
1030 | if (!dev->absinfo) |
1031 | return -EINVAL; | |
1032 | ||
448cd166 | 1033 | t = _IOC_NR(cmd) & ABS_MAX; |
41e979f8 | 1034 | |
448cd166 DT |
1035 | if (copy_from_user(&abs, p, min_t(size_t, |
1036 | size, sizeof(struct input_absinfo)))) | |
1037 | return -EFAULT; | |
1da177e4 | 1038 | |
448cd166 DT |
1039 | if (size < sizeof(struct input_absinfo)) |
1040 | abs.resolution = 0; | |
d31b2865 | 1041 | |
448cd166 DT |
1042 | /* We can't change number of reserved MT slots */ |
1043 | if (t == ABS_MT_SLOT) | |
1044 | return -EINVAL; | |
40d007e7 | 1045 | |
448cd166 DT |
1046 | /* |
1047 | * Take event lock to ensure that we are not | |
1048 | * changing device parameters in the middle | |
1049 | * of event. | |
1050 | */ | |
1051 | spin_lock_irq(&dev->event_lock); | |
1052 | dev->absinfo[t] = abs; | |
1053 | spin_unlock_irq(&dev->event_lock); | |
6addb1d6 | 1054 | |
448cd166 | 1055 | return 0; |
6addb1d6 | 1056 | } |
1da177e4 | 1057 | } |
448cd166 | 1058 | |
1da177e4 LT |
1059 | return -EINVAL; |
1060 | } | |
1da177e4 | 1061 | |
6addb1d6 DT |
1062 | static long evdev_ioctl_handler(struct file *file, unsigned int cmd, |
1063 | void __user *p, int compat_mode) | |
1064 | { | |
1065 | struct evdev_client *client = file->private_data; | |
1066 | struct evdev *evdev = client->evdev; | |
1067 | int retval; | |
1068 | ||
1069 | retval = mutex_lock_interruptible(&evdev->mutex); | |
1070 | if (retval) | |
1071 | return retval; | |
1072 | ||
c7dc6573 | 1073 | if (!evdev->exist || client->revoked) { |
6addb1d6 DT |
1074 | retval = -ENODEV; |
1075 | goto out; | |
1076 | } | |
1077 | ||
1078 | retval = evdev_do_ioctl(file, cmd, p, compat_mode); | |
1079 | ||
1080 | out: | |
1081 | mutex_unlock(&evdev->mutex); | |
1082 | return retval; | |
1083 | } | |
1084 | ||
3a51f7c4 DT |
1085 | static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1086 | { | |
1087 | return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0); | |
1088 | } | |
41e979f8 | 1089 | |
3a51f7c4 | 1090 | #ifdef CONFIG_COMPAT |
6addb1d6 DT |
1091 | static long evdev_ioctl_compat(struct file *file, |
1092 | unsigned int cmd, unsigned long arg) | |
52658bb6 | 1093 | { |
3a51f7c4 | 1094 | return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1); |
1da177e4 | 1095 | } |
52658bb6 | 1096 | #endif |
1da177e4 | 1097 | |
66e66118 | 1098 | static const struct file_operations evdev_fops = { |
6addb1d6 DT |
1099 | .owner = THIS_MODULE, |
1100 | .read = evdev_read, | |
1101 | .write = evdev_write, | |
1102 | .poll = evdev_poll, | |
1103 | .open = evdev_open, | |
1104 | .release = evdev_release, | |
1105 | .unlocked_ioctl = evdev_ioctl, | |
52658bb6 | 1106 | #ifdef CONFIG_COMPAT |
6addb1d6 | 1107 | .compat_ioctl = evdev_ioctl_compat, |
52658bb6 | 1108 | #endif |
6addb1d6 | 1109 | .fasync = evdev_fasync, |
6038f373 AB |
1110 | .flush = evdev_flush, |
1111 | .llseek = no_llseek, | |
1da177e4 LT |
1112 | }; |
1113 | ||
6addb1d6 DT |
1114 | /* |
1115 | * Mark device non-existent. This disables writes, ioctls and | |
1116 | * prevents new users from opening the device. Already posted | |
1117 | * blocking reads will stay, however new ones will fail. | |
1118 | */ | |
1119 | static void evdev_mark_dead(struct evdev *evdev) | |
1120 | { | |
1121 | mutex_lock(&evdev->mutex); | |
20da92de | 1122 | evdev->exist = false; |
6addb1d6 DT |
1123 | mutex_unlock(&evdev->mutex); |
1124 | } | |
1125 | ||
1126 | static void evdev_cleanup(struct evdev *evdev) | |
1127 | { | |
1128 | struct input_handle *handle = &evdev->handle; | |
1129 | ||
1130 | evdev_mark_dead(evdev); | |
1131 | evdev_hangup(evdev); | |
7f8d4cad DT |
1132 | |
1133 | cdev_del(&evdev->cdev); | |
6addb1d6 DT |
1134 | |
1135 | /* evdev is marked dead so no one else accesses evdev->open */ | |
1136 | if (evdev->open) { | |
1137 | input_flush_device(handle, NULL); | |
1138 | input_close_device(handle); | |
1139 | } | |
1140 | } | |
1141 | ||
1142 | /* | |
1143 | * Create new evdev device. Note that input core serializes calls | |
7f8d4cad | 1144 | * to connect and disconnect. |
6addb1d6 | 1145 | */ |
5b2a0826 DT |
1146 | static int evdev_connect(struct input_handler *handler, struct input_dev *dev, |
1147 | const struct input_device_id *id) | |
1da177e4 LT |
1148 | { |
1149 | struct evdev *evdev; | |
1150 | int minor; | |
7f8d4cad | 1151 | int dev_no; |
5b2a0826 | 1152 | int error; |
1da177e4 | 1153 | |
7f8d4cad DT |
1154 | minor = input_get_new_minor(EVDEV_MINOR_BASE, EVDEV_MINORS, true); |
1155 | if (minor < 0) { | |
1156 | error = minor; | |
1157 | pr_err("failed to reserve new minor: %d\n", error); | |
1158 | return error; | |
1da177e4 LT |
1159 | } |
1160 | ||
5b2a0826 | 1161 | evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL); |
7f8d4cad DT |
1162 | if (!evdev) { |
1163 | error = -ENOMEM; | |
1164 | goto err_free_minor; | |
1165 | } | |
1da177e4 | 1166 | |
d0ffb9be | 1167 | INIT_LIST_HEAD(&evdev->client_list); |
6addb1d6 DT |
1168 | spin_lock_init(&evdev->client_lock); |
1169 | mutex_init(&evdev->mutex); | |
1da177e4 | 1170 | init_waitqueue_head(&evdev->wait); |
20da92de | 1171 | evdev->exist = true; |
7f8d4cad DT |
1172 | |
1173 | dev_no = minor; | |
1174 | /* Normalize device number if it falls into legacy range */ | |
1175 | if (dev_no < EVDEV_MINOR_BASE + EVDEV_MINORS) | |
1176 | dev_no -= EVDEV_MINOR_BASE; | |
1177 | dev_set_name(&evdev->dev, "event%d", dev_no); | |
6addb1d6 | 1178 | |
a7097ff8 | 1179 | evdev->handle.dev = input_get_device(dev); |
3d5cb60e | 1180 | evdev->handle.name = dev_name(&evdev->dev); |
1da177e4 LT |
1181 | evdev->handle.handler = handler; |
1182 | evdev->handle.private = evdev; | |
1da177e4 | 1183 | |
7f8d4cad | 1184 | evdev->dev.devt = MKDEV(INPUT_MAJOR, minor); |
9657d75c DT |
1185 | evdev->dev.class = &input_class; |
1186 | evdev->dev.parent = &dev->dev; | |
9657d75c DT |
1187 | evdev->dev.release = evdev_free; |
1188 | device_initialize(&evdev->dev); | |
5b2a0826 | 1189 | |
6addb1d6 | 1190 | error = input_register_handle(&evdev->handle); |
5b2a0826 | 1191 | if (error) |
9657d75c | 1192 | goto err_free_evdev; |
5b2a0826 | 1193 | |
7f8d4cad | 1194 | cdev_init(&evdev->cdev, &evdev_fops); |
4a215aad | 1195 | evdev->cdev.kobj.parent = &evdev->dev.kobj; |
7f8d4cad | 1196 | error = cdev_add(&evdev->cdev, evdev->dev.devt, 1); |
6addb1d6 DT |
1197 | if (error) |
1198 | goto err_unregister_handle; | |
1199 | ||
1200 | error = device_add(&evdev->dev); | |
5b2a0826 | 1201 | if (error) |
6addb1d6 | 1202 | goto err_cleanup_evdev; |
1da177e4 | 1203 | |
5b2a0826 | 1204 | return 0; |
1da177e4 | 1205 | |
6addb1d6 DT |
1206 | err_cleanup_evdev: |
1207 | evdev_cleanup(evdev); | |
1208 | err_unregister_handle: | |
1209 | input_unregister_handle(&evdev->handle); | |
5b2a0826 | 1210 | err_free_evdev: |
9657d75c | 1211 | put_device(&evdev->dev); |
7f8d4cad DT |
1212 | err_free_minor: |
1213 | input_free_minor(minor); | |
5b2a0826 | 1214 | return error; |
1da177e4 LT |
1215 | } |
1216 | ||
1217 | static void evdev_disconnect(struct input_handle *handle) | |
1218 | { | |
1219 | struct evdev *evdev = handle->private; | |
1da177e4 | 1220 | |
9657d75c | 1221 | device_del(&evdev->dev); |
6addb1d6 | 1222 | evdev_cleanup(evdev); |
7f8d4cad | 1223 | input_free_minor(MINOR(evdev->dev.devt)); |
6addb1d6 | 1224 | input_unregister_handle(handle); |
9657d75c | 1225 | put_device(&evdev->dev); |
1da177e4 LT |
1226 | } |
1227 | ||
66e66118 | 1228 | static const struct input_device_id evdev_ids[] = { |
1da177e4 LT |
1229 | { .driver_info = 1 }, /* Matches all devices */ |
1230 | { }, /* Terminating zero entry */ | |
1231 | }; | |
1232 | ||
1233 | MODULE_DEVICE_TABLE(input, evdev_ids); | |
1234 | ||
1235 | static struct input_handler evdev_handler = { | |
6addb1d6 | 1236 | .event = evdev_event, |
a274ac15 | 1237 | .events = evdev_events, |
6addb1d6 DT |
1238 | .connect = evdev_connect, |
1239 | .disconnect = evdev_disconnect, | |
7f8d4cad | 1240 | .legacy_minors = true, |
6addb1d6 DT |
1241 | .minor = EVDEV_MINOR_BASE, |
1242 | .name = "evdev", | |
1243 | .id_table = evdev_ids, | |
1da177e4 LT |
1244 | }; |
1245 | ||
1246 | static int __init evdev_init(void) | |
1247 | { | |
4263cf0f | 1248 | return input_register_handler(&evdev_handler); |
1da177e4 LT |
1249 | } |
1250 | ||
1251 | static void __exit evdev_exit(void) | |
1252 | { | |
1253 | input_unregister_handler(&evdev_handler); | |
1254 | } | |
1255 | ||
1256 | module_init(evdev_init); | |
1257 | module_exit(evdev_exit); | |
1258 | ||
1259 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
1260 | MODULE_DESCRIPTION("Input driver event char devices"); | |
1261 | MODULE_LICENSE("GPL"); |