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