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 | 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 | 424 | |
67367fd2 | 425 | kvfree(client); |
1da177e4 | 426 | |
6addb1d6 | 427 | evdev_close_device(evdev); |
1da177e4 | 428 | |
1da177e4 LT |
429 | return 0; |
430 | } | |
431 | ||
b58f7086 HR |
432 | static unsigned int evdev_compute_buffer_size(struct input_dev *dev) |
433 | { | |
63a6404d HR |
434 | unsigned int n_events = |
435 | max(dev->hint_events_per_packet * EVDEV_BUF_PACKETS, | |
436 | EVDEV_MIN_BUFFER_SIZE); | |
437 | ||
438 | return roundup_pow_of_two(n_events); | |
b58f7086 HR |
439 | } |
440 | ||
d0ffb9be | 441 | static int evdev_open(struct inode *inode, struct file *file) |
1da177e4 | 442 | { |
7f8d4cad DT |
443 | struct evdev *evdev = container_of(inode->i_cdev, struct evdev, cdev); |
444 | unsigned int bufsize = evdev_compute_buffer_size(evdev->handle.dev); | |
92eb77d0 DS |
445 | unsigned int size = sizeof(struct evdev_client) + |
446 | bufsize * sizeof(struct input_event); | |
6addb1d6 | 447 | struct evdev_client *client; |
d542ed82 | 448 | int error; |
1da177e4 | 449 | |
92eb77d0 DS |
450 | client = kzalloc(size, GFP_KERNEL | __GFP_NOWARN); |
451 | if (!client) | |
452 | client = vzalloc(size); | |
7f8d4cad DT |
453 | if (!client) |
454 | return -ENOMEM; | |
1da177e4 | 455 | |
b58f7086 | 456 | client->bufsize = bufsize; |
6addb1d6 | 457 | spin_lock_init(&client->buffer_lock); |
d0ffb9be | 458 | client->evdev = evdev; |
6addb1d6 | 459 | evdev_attach_client(evdev, client); |
1da177e4 | 460 | |
6addb1d6 DT |
461 | error = evdev_open_device(evdev); |
462 | if (error) | |
463 | goto err_free_client; | |
1da177e4 | 464 | |
d0ffb9be | 465 | file->private_data = client; |
3d7bbd45 DT |
466 | nonseekable_open(inode, file); |
467 | ||
1da177e4 | 468 | return 0; |
9657d75c DT |
469 | |
470 | err_free_client: | |
6addb1d6 | 471 | evdev_detach_client(evdev, client); |
92788ac1 | 472 | kvfree(client); |
9657d75c | 473 | return error; |
1da177e4 LT |
474 | } |
475 | ||
6addb1d6 DT |
476 | static ssize_t evdev_write(struct file *file, const char __user *buffer, |
477 | size_t count, loff_t *ppos) | |
3a51f7c4 | 478 | { |
d0ffb9be DT |
479 | struct evdev_client *client = file->private_data; |
480 | struct evdev *evdev = client->evdev; | |
3a51f7c4 | 481 | struct input_event event; |
02dfc496 | 482 | int retval = 0; |
52658bb6 | 483 | |
2872a9b5 | 484 | if (count != 0 && count < input_event_size()) |
439581ec PK |
485 | return -EINVAL; |
486 | ||
6addb1d6 DT |
487 | retval = mutex_lock_interruptible(&evdev->mutex); |
488 | if (retval) | |
489 | return retval; | |
490 | ||
c7dc6573 | 491 | if (!evdev->exist || client->revoked) { |
6addb1d6 DT |
492 | retval = -ENODEV; |
493 | goto out; | |
494 | } | |
52658bb6 | 495 | |
2872a9b5 DT |
496 | while (retval + input_event_size() <= count) { |
497 | ||
2d56f3a3 | 498 | if (input_event_from_user(buffer + retval, &event)) { |
6addb1d6 DT |
499 | retval = -EFAULT; |
500 | goto out; | |
501 | } | |
439581ec | 502 | retval += input_event_size(); |
6addb1d6 DT |
503 | |
504 | input_inject_event(&evdev->handle, | |
505 | event.type, event.code, event.value); | |
2872a9b5 | 506 | } |
52658bb6 | 507 | |
6addb1d6 DT |
508 | out: |
509 | mutex_unlock(&evdev->mutex); | |
52658bb6 JK |
510 | return retval; |
511 | } | |
52658bb6 | 512 | |
6addb1d6 DT |
513 | static int evdev_fetch_next_event(struct evdev_client *client, |
514 | struct input_event *event) | |
515 | { | |
516 | int have_event; | |
517 | ||
518 | spin_lock_irq(&client->buffer_lock); | |
519 | ||
566cf5b6 | 520 | have_event = client->packet_head != client->tail; |
6addb1d6 DT |
521 | if (have_event) { |
522 | *event = client->buffer[client->tail++]; | |
b58f7086 | 523 | client->tail &= client->bufsize - 1; |
6addb1d6 DT |
524 | } |
525 | ||
526 | spin_unlock_irq(&client->buffer_lock); | |
527 | ||
528 | return have_event; | |
529 | } | |
530 | ||
531 | static ssize_t evdev_read(struct file *file, char __user *buffer, | |
532 | size_t count, loff_t *ppos) | |
1da177e4 | 533 | { |
d0ffb9be DT |
534 | struct evdev_client *client = file->private_data; |
535 | struct evdev *evdev = client->evdev; | |
6addb1d6 | 536 | struct input_event event; |
2872a9b5 DT |
537 | size_t read = 0; |
538 | int error; | |
1da177e4 | 539 | |
2872a9b5 | 540 | if (count != 0 && count < input_event_size()) |
1da177e4 LT |
541 | return -EINVAL; |
542 | ||
2872a9b5 | 543 | for (;;) { |
c7dc6573 | 544 | if (!evdev->exist || client->revoked) |
2872a9b5 | 545 | return -ENODEV; |
1da177e4 | 546 | |
2872a9b5 DT |
547 | if (client->packet_head == client->tail && |
548 | (file->f_flags & O_NONBLOCK)) | |
549 | return -EAGAIN; | |
550 | ||
551 | /* | |
552 | * count == 0 is special - no IO is done but we check | |
553 | * for error conditions (see above). | |
554 | */ | |
555 | if (count == 0) | |
556 | break; | |
1da177e4 | 557 | |
2872a9b5 DT |
558 | while (read + input_event_size() <= count && |
559 | evdev_fetch_next_event(client, &event)) { | |
3a51f7c4 | 560 | |
2872a9b5 DT |
561 | if (input_event_to_user(buffer + read, &event)) |
562 | return -EFAULT; | |
3a51f7c4 | 563 | |
2872a9b5 DT |
564 | read += input_event_size(); |
565 | } | |
1da177e4 | 566 | |
2872a9b5 DT |
567 | if (read) |
568 | break; | |
e90f869c | 569 | |
2872a9b5 DT |
570 | if (!(file->f_flags & O_NONBLOCK)) { |
571 | error = wait_event_interruptible(evdev->wait, | |
572 | client->packet_head != client->tail || | |
c7dc6573 | 573 | !evdev->exist || client->revoked); |
2872a9b5 DT |
574 | if (error) |
575 | return error; | |
576 | } | |
577 | } | |
578 | ||
579 | return read; | |
1da177e4 LT |
580 | } |
581 | ||
582 | /* No kernel lock - fine */ | |
583 | static unsigned int evdev_poll(struct file *file, poll_table *wait) | |
584 | { | |
d0ffb9be DT |
585 | struct evdev_client *client = file->private_data; |
586 | struct evdev *evdev = client->evdev; | |
c18fb139 | 587 | unsigned int mask; |
1e0afb28 | 588 | |
d0ffb9be | 589 | poll_wait(file, &evdev->wait, wait); |
c18fb139 | 590 | |
c7dc6573 DH |
591 | if (evdev->exist && !client->revoked) |
592 | mask = POLLOUT | POLLWRNORM; | |
593 | else | |
594 | mask = POLLHUP | POLLERR; | |
595 | ||
cdda911c | 596 | if (client->packet_head != client->tail) |
c18fb139 DT |
597 | mask |= POLLIN | POLLRDNORM; |
598 | ||
599 | return mask; | |
1da177e4 LT |
600 | } |
601 | ||
3a51f7c4 DT |
602 | #ifdef CONFIG_COMPAT |
603 | ||
604 | #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) | |
7b19ada2 | 605 | #define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1) |
3a51f7c4 DT |
606 | |
607 | #ifdef __BIG_ENDIAN | |
608 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
609 | unsigned int maxlen, void __user *p, int compat) | |
610 | { | |
611 | int len, i; | |
612 | ||
613 | if (compat) { | |
7b19ada2 | 614 | len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t); |
bf61f8d3 | 615 | if (len > maxlen) |
3a51f7c4 DT |
616 | len = maxlen; |
617 | ||
618 | for (i = 0; i < len / sizeof(compat_long_t); i++) | |
619 | if (copy_to_user((compat_long_t __user *) p + i, | |
620 | (compat_long_t *) bits + | |
621 | i + 1 - ((i % 2) << 1), | |
622 | sizeof(compat_long_t))) | |
623 | return -EFAULT; | |
624 | } else { | |
7b19ada2 | 625 | len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
626 | if (len > maxlen) |
627 | len = maxlen; | |
628 | ||
629 | if (copy_to_user(p, bits, len)) | |
630 | return -EFAULT; | |
631 | } | |
632 | ||
633 | return len; | |
634 | } | |
635 | #else | |
636 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
637 | unsigned int maxlen, void __user *p, int compat) | |
638 | { | |
639 | int len = compat ? | |
7b19ada2 JS |
640 | BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) : |
641 | BITS_TO_LONGS(maxbit) * sizeof(long); | |
3a51f7c4 DT |
642 | |
643 | if (len > maxlen) | |
644 | len = maxlen; | |
645 | ||
646 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
647 | } | |
648 | #endif /* __BIG_ENDIAN */ | |
649 | ||
650 | #else | |
651 | ||
652 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
653 | unsigned int maxlen, void __user *p, int compat) | |
654 | { | |
7b19ada2 | 655 | int len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
656 | |
657 | if (len > maxlen) | |
658 | len = maxlen; | |
659 | ||
660 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
661 | } | |
662 | ||
663 | #endif /* CONFIG_COMPAT */ | |
664 | ||
665 | static int str_to_user(const char *str, unsigned int maxlen, void __user *p) | |
666 | { | |
667 | int len; | |
668 | ||
669 | if (!str) | |
670 | return -ENOENT; | |
671 | ||
672 | len = strlen(str) + 1; | |
673 | if (len > maxlen) | |
674 | len = maxlen; | |
675 | ||
676 | return copy_to_user(p, str, len) ? -EFAULT : len; | |
677 | } | |
678 | ||
448cd166 DT |
679 | static int handle_eviocgbit(struct input_dev *dev, |
680 | unsigned int type, unsigned int size, | |
681 | void __user *p, int compat_mode) | |
5402a734 LT |
682 | { |
683 | unsigned long *bits; | |
684 | int len; | |
685 | ||
448cd166 | 686 | switch (type) { |
5402a734 LT |
687 | |
688 | case 0: bits = dev->evbit; len = EV_MAX; break; | |
689 | case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; | |
690 | case EV_REL: bits = dev->relbit; len = REL_MAX; break; | |
691 | case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; | |
692 | case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; | |
693 | case EV_LED: bits = dev->ledbit; len = LED_MAX; break; | |
694 | case EV_SND: bits = dev->sndbit; len = SND_MAX; break; | |
695 | case EV_FF: bits = dev->ffbit; len = FF_MAX; break; | |
696 | case EV_SW: bits = dev->swbit; len = SW_MAX; break; | |
697 | default: return -EINVAL; | |
698 | } | |
f2afa771 | 699 | |
448cd166 | 700 | return bits_to_user(bits, len, size, p, compat_mode); |
5402a734 | 701 | } |
5402a734 | 702 | |
ab4e0192 | 703 | static int evdev_handle_get_keycode(struct input_dev *dev, void __user *p) |
8613e4c2 | 704 | { |
ab4e0192 DT |
705 | struct input_keymap_entry ke = { |
706 | .len = sizeof(unsigned int), | |
707 | .flags = 0, | |
708 | }; | |
709 | int __user *ip = (int __user *)p; | |
8613e4c2 MCC |
710 | int error; |
711 | ||
ab4e0192 DT |
712 | /* legacy case */ |
713 | if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) | |
714 | return -EFAULT; | |
8613e4c2 | 715 | |
ab4e0192 DT |
716 | error = input_get_keycode(dev, &ke); |
717 | if (error) | |
718 | return error; | |
8613e4c2 | 719 | |
ab4e0192 DT |
720 | if (put_user(ke.keycode, ip + 1)) |
721 | return -EFAULT; | |
8613e4c2 | 722 | |
ab4e0192 DT |
723 | return 0; |
724 | } | |
8613e4c2 | 725 | |
ab4e0192 DT |
726 | static int evdev_handle_get_keycode_v2(struct input_dev *dev, void __user *p) |
727 | { | |
728 | struct input_keymap_entry ke; | |
729 | int error; | |
8613e4c2 | 730 | |
ab4e0192 DT |
731 | if (copy_from_user(&ke, p, sizeof(ke))) |
732 | return -EFAULT; | |
8613e4c2 | 733 | |
ab4e0192 DT |
734 | error = input_get_keycode(dev, &ke); |
735 | if (error) | |
736 | return error; | |
8613e4c2 | 737 | |
ab4e0192 DT |
738 | if (copy_to_user(p, &ke, sizeof(ke))) |
739 | return -EFAULT; | |
8613e4c2 | 740 | |
8613e4c2 MCC |
741 | return 0; |
742 | } | |
743 | ||
ab4e0192 | 744 | static int evdev_handle_set_keycode(struct input_dev *dev, void __user *p) |
8613e4c2 | 745 | { |
ab4e0192 DT |
746 | struct input_keymap_entry ke = { |
747 | .len = sizeof(unsigned int), | |
748 | .flags = 0, | |
749 | }; | |
750 | int __user *ip = (int __user *)p; | |
8613e4c2 | 751 | |
ab4e0192 DT |
752 | if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) |
753 | return -EFAULT; | |
8613e4c2 | 754 | |
ab4e0192 DT |
755 | if (get_user(ke.keycode, ip + 1)) |
756 | return -EFAULT; | |
8613e4c2 | 757 | |
ab4e0192 DT |
758 | return input_set_keycode(dev, &ke); |
759 | } | |
8613e4c2 | 760 | |
ab4e0192 DT |
761 | static int evdev_handle_set_keycode_v2(struct input_dev *dev, void __user *p) |
762 | { | |
763 | struct input_keymap_entry ke; | |
8613e4c2 | 764 | |
ab4e0192 DT |
765 | if (copy_from_user(&ke, p, sizeof(ke))) |
766 | return -EFAULT; | |
8613e4c2 | 767 | |
ab4e0192 DT |
768 | if (ke.len > sizeof(ke.scancode)) |
769 | return -EINVAL; | |
8613e4c2 MCC |
770 | |
771 | return input_set_keycode(dev, &ke); | |
772 | } | |
773 | ||
48318028 DH |
774 | /* |
775 | * If we transfer state to the user, we should flush all pending events | |
776 | * of the same type from the client's queue. Otherwise, they might end up | |
777 | * with duplicate events, which can screw up client's state tracking. | |
778 | * If bits_to_user fails after flushing the queue, we queue a SYN_DROPPED | |
779 | * event so user-space will notice missing events. | |
780 | * | |
781 | * LOCKING: | |
782 | * We need to take event_lock before buffer_lock to avoid dead-locks. But we | |
783 | * need the even_lock only to guarantee consistent state. We can safely release | |
784 | * it while flushing the queue. This allows input-core to handle filters while | |
785 | * we flush the queue. | |
786 | */ | |
787 | static int evdev_handle_get_val(struct evdev_client *client, | |
788 | struct input_dev *dev, unsigned int type, | |
7c4f5607 DT |
789 | unsigned long *bits, unsigned int maxbit, |
790 | unsigned int maxlen, void __user *p, | |
791 | int compat) | |
48318028 DH |
792 | { |
793 | int ret; | |
794 | unsigned long *mem; | |
7c4f5607 | 795 | size_t len; |
48318028 | 796 | |
7c4f5607 DT |
797 | len = BITS_TO_LONGS(maxbit) * sizeof(unsigned long); |
798 | mem = kmalloc(len, GFP_KERNEL); | |
48318028 DH |
799 | if (!mem) |
800 | return -ENOMEM; | |
801 | ||
802 | spin_lock_irq(&dev->event_lock); | |
803 | spin_lock(&client->buffer_lock); | |
804 | ||
7c4f5607 | 805 | memcpy(mem, bits, len); |
48318028 DH |
806 | |
807 | spin_unlock(&dev->event_lock); | |
808 | ||
809 | __evdev_flush_queue(client, type); | |
810 | ||
811 | spin_unlock_irq(&client->buffer_lock); | |
812 | ||
7c4f5607 | 813 | ret = bits_to_user(mem, maxbit, maxlen, p, compat); |
48318028 | 814 | if (ret < 0) |
b881d537 | 815 | evdev_queue_syn_dropped(client); |
48318028 DH |
816 | |
817 | kfree(mem); | |
818 | ||
819 | return ret; | |
820 | } | |
821 | ||
1cf0c6e6 HR |
822 | static int evdev_handle_mt_request(struct input_dev *dev, |
823 | unsigned int size, | |
824 | int __user *ip) | |
825 | { | |
8d18fba2 | 826 | const struct input_mt *mt = dev->mt; |
1cf0c6e6 HR |
827 | unsigned int code; |
828 | int max_slots; | |
829 | int i; | |
830 | ||
831 | if (get_user(code, &ip[0])) | |
832 | return -EFAULT; | |
8d18fba2 | 833 | if (!mt || !input_is_mt_value(code)) |
1cf0c6e6 HR |
834 | return -EINVAL; |
835 | ||
836 | max_slots = (size - sizeof(__u32)) / sizeof(__s32); | |
8d18fba2 HR |
837 | for (i = 0; i < mt->num_slots && i < max_slots; i++) { |
838 | int value = input_mt_get_value(&mt->slots[i], code); | |
839 | if (put_user(value, &ip[1 + i])) | |
1cf0c6e6 | 840 | return -EFAULT; |
8d18fba2 | 841 | } |
1cf0c6e6 HR |
842 | |
843 | return 0; | |
844 | } | |
845 | ||
c7dc6573 DH |
846 | static int evdev_revoke(struct evdev *evdev, struct evdev_client *client, |
847 | struct file *file) | |
848 | { | |
849 | client->revoked = true; | |
850 | evdev_ungrab(evdev, client); | |
851 | input_flush_device(&evdev->handle, file); | |
852 | wake_up_interruptible(&evdev->wait); | |
853 | ||
854 | return 0; | |
855 | } | |
856 | ||
6addb1d6 DT |
857 | static long evdev_do_ioctl(struct file *file, unsigned int cmd, |
858 | void __user *p, int compat_mode) | |
1da177e4 | 859 | { |
d0ffb9be DT |
860 | struct evdev_client *client = file->private_data; |
861 | struct evdev *evdev = client->evdev; | |
1da177e4 LT |
862 | struct input_dev *dev = evdev->handle.dev; |
863 | struct input_absinfo abs; | |
509ca1a9 | 864 | struct ff_effect effect; |
3a51f7c4 | 865 | int __user *ip = (int __user *)p; |
58b93995 | 866 | unsigned int i, t, u, v; |
448cd166 | 867 | unsigned int size; |
509ca1a9 | 868 | int error; |
1da177e4 | 869 | |
448cd166 | 870 | /* First we check for fixed-length commands */ |
1da177e4 LT |
871 | switch (cmd) { |
872 | ||
6addb1d6 DT |
873 | case EVIOCGVERSION: |
874 | return put_user(EV_VERSION, ip); | |
1da177e4 | 875 | |
6addb1d6 DT |
876 | case EVIOCGID: |
877 | if (copy_to_user(p, &dev->id, sizeof(struct input_id))) | |
878 | return -EFAULT; | |
879 | return 0; | |
08791e5c | 880 | |
6addb1d6 DT |
881 | case EVIOCGREP: |
882 | if (!test_bit(EV_REP, dev->evbit)) | |
883 | return -ENOSYS; | |
884 | if (put_user(dev->rep[REP_DELAY], ip)) | |
885 | return -EFAULT; | |
886 | if (put_user(dev->rep[REP_PERIOD], ip + 1)) | |
887 | return -EFAULT; | |
888 | return 0; | |
08791e5c | 889 | |
6addb1d6 DT |
890 | case EVIOCSREP: |
891 | if (!test_bit(EV_REP, dev->evbit)) | |
892 | return -ENOSYS; | |
893 | if (get_user(u, ip)) | |
894 | return -EFAULT; | |
895 | if (get_user(v, ip + 1)) | |
896 | return -EFAULT; | |
08791e5c | 897 | |
6addb1d6 DT |
898 | input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u); |
899 | input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v); | |
3a51f7c4 | 900 | |
6addb1d6 | 901 | return 0; |
1da177e4 | 902 | |
6addb1d6 DT |
903 | case EVIOCRMFF: |
904 | return input_ff_erase(dev, (int)(unsigned long) p, file); | |
1da177e4 | 905 | |
6addb1d6 DT |
906 | case EVIOCGEFFECTS: |
907 | i = test_bit(EV_FF, dev->evbit) ? | |
908 | dev->ff->max_effects : 0; | |
909 | if (put_user(i, ip)) | |
910 | return -EFAULT; | |
911 | return 0; | |
912 | ||
913 | case EVIOCGRAB: | |
914 | if (p) | |
915 | return evdev_grab(evdev, client); | |
916 | else | |
917 | return evdev_ungrab(evdev, client); | |
ab4e0192 | 918 | |
c7dc6573 DH |
919 | case EVIOCREVOKE: |
920 | if (p) | |
921 | return -EINVAL; | |
922 | else | |
923 | return evdev_revoke(evdev, client, file); | |
924 | ||
a80b83b7 JS |
925 | case EVIOCSCLOCKID: |
926 | if (copy_from_user(&i, p, sizeof(unsigned int))) | |
927 | return -EFAULT; | |
aac8bcf1 AM |
928 | |
929 | return evdev_set_clk_type(client, i); | |
a80b83b7 | 930 | |
ab4e0192 DT |
931 | case EVIOCGKEYCODE: |
932 | return evdev_handle_get_keycode(dev, p); | |
933 | ||
934 | case EVIOCSKEYCODE: | |
935 | return evdev_handle_set_keycode(dev, p); | |
936 | ||
937 | case EVIOCGKEYCODE_V2: | |
938 | return evdev_handle_get_keycode_v2(dev, p); | |
939 | ||
940 | case EVIOCSKEYCODE_V2: | |
941 | return evdev_handle_set_keycode_v2(dev, p); | |
448cd166 | 942 | } |
1da177e4 | 943 | |
448cd166 | 944 | size = _IOC_SIZE(cmd); |
1da177e4 | 945 | |
448cd166 DT |
946 | /* Now check variable-length commands */ |
947 | #define EVIOC_MASK_SIZE(nr) ((nr) & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) | |
448cd166 | 948 | switch (EVIOC_MASK_SIZE(cmd)) { |
41e979f8 | 949 | |
85b77200 HR |
950 | case EVIOCGPROP(0): |
951 | return bits_to_user(dev->propbit, INPUT_PROP_MAX, | |
952 | size, p, compat_mode); | |
953 | ||
1cf0c6e6 HR |
954 | case EVIOCGMTSLOTS(0): |
955 | return evdev_handle_mt_request(dev, size, ip); | |
956 | ||
448cd166 | 957 | case EVIOCGKEY(0): |
48318028 DH |
958 | return evdev_handle_get_val(client, dev, EV_KEY, dev->key, |
959 | KEY_MAX, size, p, compat_mode); | |
1da177e4 | 960 | |
448cd166 | 961 | case EVIOCGLED(0): |
48318028 DH |
962 | return evdev_handle_get_val(client, dev, EV_LED, dev->led, |
963 | LED_MAX, size, p, compat_mode); | |
1da177e4 | 964 | |
448cd166 | 965 | case EVIOCGSND(0): |
48318028 DH |
966 | return evdev_handle_get_val(client, dev, EV_SND, dev->snd, |
967 | SND_MAX, size, p, compat_mode); | |
1da177e4 | 968 | |
448cd166 | 969 | case EVIOCGSW(0): |
48318028 DH |
970 | return evdev_handle_get_val(client, dev, EV_SW, dev->sw, |
971 | SW_MAX, size, p, compat_mode); | |
31581066 | 972 | |
448cd166 DT |
973 | case EVIOCGNAME(0): |
974 | return str_to_user(dev->name, size, p); | |
1da177e4 | 975 | |
448cd166 DT |
976 | case EVIOCGPHYS(0): |
977 | return str_to_user(dev->phys, size, p); | |
1da177e4 | 978 | |
448cd166 DT |
979 | case EVIOCGUNIQ(0): |
980 | return str_to_user(dev->uniq, size, p); | |
1da177e4 | 981 | |
448cd166 DT |
982 | case EVIOC_MASK_SIZE(EVIOCSFF): |
983 | if (input_ff_effect_from_user(p, size, &effect)) | |
984 | return -EFAULT; | |
1da177e4 | 985 | |
448cd166 | 986 | error = input_ff_upload(dev, &effect, file); |
fc7392aa EV |
987 | if (error) |
988 | return error; | |
1da177e4 | 989 | |
448cd166 DT |
990 | if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) |
991 | return -EFAULT; | |
41e979f8 | 992 | |
fc7392aa | 993 | return 0; |
448cd166 | 994 | } |
1da177e4 | 995 | |
448cd166 DT |
996 | /* Multi-number variable-length handlers */ |
997 | if (_IOC_TYPE(cmd) != 'E') | |
998 | return -EINVAL; | |
1da177e4 | 999 | |
448cd166 | 1000 | if (_IOC_DIR(cmd) == _IOC_READ) { |
6addb1d6 | 1001 | |
448cd166 DT |
1002 | if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0))) |
1003 | return handle_eviocgbit(dev, | |
1004 | _IOC_NR(cmd) & EV_MAX, size, | |
1005 | p, compat_mode); | |
1da177e4 | 1006 | |
448cd166 | 1007 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { |
f2278f31 | 1008 | |
0a74a1df DM |
1009 | if (!dev->absinfo) |
1010 | return -EINVAL; | |
1011 | ||
448cd166 DT |
1012 | t = _IOC_NR(cmd) & ABS_MAX; |
1013 | abs = dev->absinfo[t]; | |
f2278f31 | 1014 | |
448cd166 DT |
1015 | if (copy_to_user(p, &abs, min_t(size_t, |
1016 | size, sizeof(struct input_absinfo)))) | |
1017 | return -EFAULT; | |
f2278f31 | 1018 | |
448cd166 DT |
1019 | return 0; |
1020 | } | |
1021 | } | |
f2278f31 | 1022 | |
f9ce6eb5 | 1023 | if (_IOC_DIR(cmd) == _IOC_WRITE) { |
f2278f31 | 1024 | |
448cd166 | 1025 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { |
1da177e4 | 1026 | |
0a74a1df DM |
1027 | if (!dev->absinfo) |
1028 | return -EINVAL; | |
1029 | ||
448cd166 | 1030 | t = _IOC_NR(cmd) & ABS_MAX; |
41e979f8 | 1031 | |
448cd166 DT |
1032 | if (copy_from_user(&abs, p, min_t(size_t, |
1033 | size, sizeof(struct input_absinfo)))) | |
1034 | return -EFAULT; | |
1da177e4 | 1035 | |
448cd166 DT |
1036 | if (size < sizeof(struct input_absinfo)) |
1037 | abs.resolution = 0; | |
d31b2865 | 1038 | |
448cd166 DT |
1039 | /* We can't change number of reserved MT slots */ |
1040 | if (t == ABS_MT_SLOT) | |
1041 | return -EINVAL; | |
40d007e7 | 1042 | |
448cd166 DT |
1043 | /* |
1044 | * Take event lock to ensure that we are not | |
1045 | * changing device parameters in the middle | |
1046 | * of event. | |
1047 | */ | |
1048 | spin_lock_irq(&dev->event_lock); | |
1049 | dev->absinfo[t] = abs; | |
1050 | spin_unlock_irq(&dev->event_lock); | |
6addb1d6 | 1051 | |
448cd166 | 1052 | return 0; |
6addb1d6 | 1053 | } |
1da177e4 | 1054 | } |
448cd166 | 1055 | |
1da177e4 LT |
1056 | return -EINVAL; |
1057 | } | |
1da177e4 | 1058 | |
6addb1d6 DT |
1059 | static long evdev_ioctl_handler(struct file *file, unsigned int cmd, |
1060 | void __user *p, int compat_mode) | |
1061 | { | |
1062 | struct evdev_client *client = file->private_data; | |
1063 | struct evdev *evdev = client->evdev; | |
1064 | int retval; | |
1065 | ||
1066 | retval = mutex_lock_interruptible(&evdev->mutex); | |
1067 | if (retval) | |
1068 | return retval; | |
1069 | ||
c7dc6573 | 1070 | if (!evdev->exist || client->revoked) { |
6addb1d6 DT |
1071 | retval = -ENODEV; |
1072 | goto out; | |
1073 | } | |
1074 | ||
1075 | retval = evdev_do_ioctl(file, cmd, p, compat_mode); | |
1076 | ||
1077 | out: | |
1078 | mutex_unlock(&evdev->mutex); | |
1079 | return retval; | |
1080 | } | |
1081 | ||
3a51f7c4 DT |
1082 | static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1083 | { | |
1084 | return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0); | |
1085 | } | |
41e979f8 | 1086 | |
3a51f7c4 | 1087 | #ifdef CONFIG_COMPAT |
6addb1d6 DT |
1088 | static long evdev_ioctl_compat(struct file *file, |
1089 | unsigned int cmd, unsigned long arg) | |
52658bb6 | 1090 | { |
3a51f7c4 | 1091 | return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1); |
1da177e4 | 1092 | } |
52658bb6 | 1093 | #endif |
1da177e4 | 1094 | |
66e66118 | 1095 | static const struct file_operations evdev_fops = { |
6addb1d6 DT |
1096 | .owner = THIS_MODULE, |
1097 | .read = evdev_read, | |
1098 | .write = evdev_write, | |
1099 | .poll = evdev_poll, | |
1100 | .open = evdev_open, | |
1101 | .release = evdev_release, | |
1102 | .unlocked_ioctl = evdev_ioctl, | |
52658bb6 | 1103 | #ifdef CONFIG_COMPAT |
6addb1d6 | 1104 | .compat_ioctl = evdev_ioctl_compat, |
52658bb6 | 1105 | #endif |
6addb1d6 | 1106 | .fasync = evdev_fasync, |
6038f373 AB |
1107 | .flush = evdev_flush, |
1108 | .llseek = no_llseek, | |
1da177e4 LT |
1109 | }; |
1110 | ||
6addb1d6 DT |
1111 | /* |
1112 | * Mark device non-existent. This disables writes, ioctls and | |
1113 | * prevents new users from opening the device. Already posted | |
1114 | * blocking reads will stay, however new ones will fail. | |
1115 | */ | |
1116 | static void evdev_mark_dead(struct evdev *evdev) | |
1117 | { | |
1118 | mutex_lock(&evdev->mutex); | |
20da92de | 1119 | evdev->exist = false; |
6addb1d6 DT |
1120 | mutex_unlock(&evdev->mutex); |
1121 | } | |
1122 | ||
1123 | static void evdev_cleanup(struct evdev *evdev) | |
1124 | { | |
1125 | struct input_handle *handle = &evdev->handle; | |
1126 | ||
1127 | evdev_mark_dead(evdev); | |
1128 | evdev_hangup(evdev); | |
7f8d4cad DT |
1129 | |
1130 | cdev_del(&evdev->cdev); | |
6addb1d6 DT |
1131 | |
1132 | /* evdev is marked dead so no one else accesses evdev->open */ | |
1133 | if (evdev->open) { | |
1134 | input_flush_device(handle, NULL); | |
1135 | input_close_device(handle); | |
1136 | } | |
1137 | } | |
1138 | ||
1139 | /* | |
1140 | * Create new evdev device. Note that input core serializes calls | |
7f8d4cad | 1141 | * to connect and disconnect. |
6addb1d6 | 1142 | */ |
5b2a0826 DT |
1143 | static int evdev_connect(struct input_handler *handler, struct input_dev *dev, |
1144 | const struct input_device_id *id) | |
1da177e4 LT |
1145 | { |
1146 | struct evdev *evdev; | |
1147 | int minor; | |
7f8d4cad | 1148 | int dev_no; |
5b2a0826 | 1149 | int error; |
1da177e4 | 1150 | |
7f8d4cad DT |
1151 | minor = input_get_new_minor(EVDEV_MINOR_BASE, EVDEV_MINORS, true); |
1152 | if (minor < 0) { | |
1153 | error = minor; | |
1154 | pr_err("failed to reserve new minor: %d\n", error); | |
1155 | return error; | |
1da177e4 LT |
1156 | } |
1157 | ||
5b2a0826 | 1158 | evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL); |
7f8d4cad DT |
1159 | if (!evdev) { |
1160 | error = -ENOMEM; | |
1161 | goto err_free_minor; | |
1162 | } | |
1da177e4 | 1163 | |
d0ffb9be | 1164 | INIT_LIST_HEAD(&evdev->client_list); |
6addb1d6 DT |
1165 | spin_lock_init(&evdev->client_lock); |
1166 | mutex_init(&evdev->mutex); | |
1da177e4 | 1167 | init_waitqueue_head(&evdev->wait); |
20da92de | 1168 | evdev->exist = true; |
7f8d4cad DT |
1169 | |
1170 | dev_no = minor; | |
1171 | /* Normalize device number if it falls into legacy range */ | |
1172 | if (dev_no < EVDEV_MINOR_BASE + EVDEV_MINORS) | |
1173 | dev_no -= EVDEV_MINOR_BASE; | |
1174 | dev_set_name(&evdev->dev, "event%d", dev_no); | |
6addb1d6 | 1175 | |
a7097ff8 | 1176 | evdev->handle.dev = input_get_device(dev); |
3d5cb60e | 1177 | evdev->handle.name = dev_name(&evdev->dev); |
1da177e4 LT |
1178 | evdev->handle.handler = handler; |
1179 | evdev->handle.private = evdev; | |
1da177e4 | 1180 | |
7f8d4cad | 1181 | evdev->dev.devt = MKDEV(INPUT_MAJOR, minor); |
9657d75c DT |
1182 | evdev->dev.class = &input_class; |
1183 | evdev->dev.parent = &dev->dev; | |
9657d75c DT |
1184 | evdev->dev.release = evdev_free; |
1185 | device_initialize(&evdev->dev); | |
5b2a0826 | 1186 | |
6addb1d6 | 1187 | error = input_register_handle(&evdev->handle); |
5b2a0826 | 1188 | if (error) |
9657d75c | 1189 | goto err_free_evdev; |
5b2a0826 | 1190 | |
7f8d4cad | 1191 | cdev_init(&evdev->cdev, &evdev_fops); |
4a215aad | 1192 | evdev->cdev.kobj.parent = &evdev->dev.kobj; |
7f8d4cad | 1193 | error = cdev_add(&evdev->cdev, evdev->dev.devt, 1); |
6addb1d6 DT |
1194 | if (error) |
1195 | goto err_unregister_handle; | |
1196 | ||
1197 | error = device_add(&evdev->dev); | |
5b2a0826 | 1198 | if (error) |
6addb1d6 | 1199 | goto err_cleanup_evdev; |
1da177e4 | 1200 | |
5b2a0826 | 1201 | return 0; |
1da177e4 | 1202 | |
6addb1d6 DT |
1203 | err_cleanup_evdev: |
1204 | evdev_cleanup(evdev); | |
1205 | err_unregister_handle: | |
1206 | input_unregister_handle(&evdev->handle); | |
5b2a0826 | 1207 | err_free_evdev: |
9657d75c | 1208 | put_device(&evdev->dev); |
7f8d4cad DT |
1209 | err_free_minor: |
1210 | input_free_minor(minor); | |
5b2a0826 | 1211 | return error; |
1da177e4 LT |
1212 | } |
1213 | ||
1214 | static void evdev_disconnect(struct input_handle *handle) | |
1215 | { | |
1216 | struct evdev *evdev = handle->private; | |
1da177e4 | 1217 | |
9657d75c | 1218 | device_del(&evdev->dev); |
6addb1d6 | 1219 | evdev_cleanup(evdev); |
7f8d4cad | 1220 | input_free_minor(MINOR(evdev->dev.devt)); |
6addb1d6 | 1221 | input_unregister_handle(handle); |
9657d75c | 1222 | put_device(&evdev->dev); |
1da177e4 LT |
1223 | } |
1224 | ||
66e66118 | 1225 | static const struct input_device_id evdev_ids[] = { |
1da177e4 LT |
1226 | { .driver_info = 1 }, /* Matches all devices */ |
1227 | { }, /* Terminating zero entry */ | |
1228 | }; | |
1229 | ||
1230 | MODULE_DEVICE_TABLE(input, evdev_ids); | |
1231 | ||
1232 | static struct input_handler evdev_handler = { | |
6addb1d6 | 1233 | .event = evdev_event, |
a274ac15 | 1234 | .events = evdev_events, |
6addb1d6 DT |
1235 | .connect = evdev_connect, |
1236 | .disconnect = evdev_disconnect, | |
7f8d4cad | 1237 | .legacy_minors = true, |
6addb1d6 DT |
1238 | .minor = EVDEV_MINOR_BASE, |
1239 | .name = "evdev", | |
1240 | .id_table = evdev_ids, | |
1da177e4 LT |
1241 | }; |
1242 | ||
1243 | static int __init evdev_init(void) | |
1244 | { | |
4263cf0f | 1245 | return input_register_handler(&evdev_handler); |
1da177e4 LT |
1246 | } |
1247 | ||
1248 | static void __exit evdev_exit(void) | |
1249 | { | |
1250 | input_unregister_handler(&evdev_handler); | |
1251 | } | |
1252 | ||
1253 | module_init(evdev_init); | |
1254 | module_exit(evdev_exit); | |
1255 | ||
1256 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
1257 | MODULE_DESCRIPTION("Input driver event char devices"); | |
1258 | MODULE_LICENSE("GPL"); |