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Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * Event char devices, giving access to raw input device events. | |
4 | * | |
5 | * Copyright (c) 1999-2002 Vojtech Pavlik | |
1da177e4 LT |
6 | */ |
7 | ||
da0c4901 JP |
8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
9 | ||
1da177e4 LT |
10 | #define EVDEV_MINOR_BASE 64 |
11 | #define EVDEV_MINORS 32 | |
63a6404d HR |
12 | #define EVDEV_MIN_BUFFER_SIZE 64U |
13 | #define EVDEV_BUF_PACKETS 8 | |
1da177e4 LT |
14 | |
15 | #include <linux/poll.h> | |
a99bbaf5 | 16 | #include <linux/sched.h> |
1da177e4 | 17 | #include <linux/slab.h> |
92eb77d0 DS |
18 | #include <linux/vmalloc.h> |
19 | #include <linux/mm.h> | |
1da177e4 LT |
20 | #include <linux/module.h> |
21 | #include <linux/init.h> | |
1cf0c6e6 | 22 | #include <linux/input/mt.h> |
1da177e4 | 23 | #include <linux/major.h> |
1da177e4 | 24 | #include <linux/device.h> |
7f8d4cad | 25 | #include <linux/cdev.h> |
2d56f3a3 | 26 | #include "input-compat.h" |
1da177e4 LT |
27 | |
28 | struct evdev { | |
1da177e4 | 29 | int open; |
1da177e4 LT |
30 | struct input_handle handle; |
31 | wait_queue_head_t wait; | |
2be85279 | 32 | struct evdev_client __rcu *grab; |
d0ffb9be | 33 | struct list_head client_list; |
6addb1d6 DT |
34 | spinlock_t client_lock; /* protects client_list */ |
35 | struct mutex mutex; | |
9657d75c | 36 | struct device dev; |
7f8d4cad | 37 | struct cdev cdev; |
20da92de | 38 | bool exist; |
1da177e4 LT |
39 | }; |
40 | ||
d0ffb9be | 41 | struct evdev_client { |
9fb0f14e JB |
42 | unsigned int head; |
43 | unsigned int tail; | |
cdda911c | 44 | unsigned int packet_head; /* [future] position of the first element of next packet */ |
6addb1d6 | 45 | spinlock_t buffer_lock; /* protects access to buffer, head and tail */ |
1da177e4 LT |
46 | struct fasync_struct *fasync; |
47 | struct evdev *evdev; | |
48 | struct list_head node; | |
3b51c44b | 49 | enum input_clock_type clk_type; |
c7dc6573 | 50 | bool revoked; |
06a16293 | 51 | unsigned long *evmasks[EV_CNT]; |
9fb0f14e | 52 | unsigned int bufsize; |
b58f7086 | 53 | struct input_event buffer[]; |
1da177e4 LT |
54 | }; |
55 | ||
06a16293 DH |
56 | static size_t evdev_get_mask_cnt(unsigned int type) |
57 | { | |
58 | static const size_t counts[EV_CNT] = { | |
59 | /* EV_SYN==0 is EV_CNT, _not_ SYN_CNT, see EVIOCGBIT */ | |
60 | [EV_SYN] = EV_CNT, | |
61 | [EV_KEY] = KEY_CNT, | |
62 | [EV_REL] = REL_CNT, | |
63 | [EV_ABS] = ABS_CNT, | |
64 | [EV_MSC] = MSC_CNT, | |
65 | [EV_SW] = SW_CNT, | |
66 | [EV_LED] = LED_CNT, | |
67 | [EV_SND] = SND_CNT, | |
68 | [EV_FF] = FF_CNT, | |
69 | }; | |
70 | ||
71 | return (type < EV_CNT) ? counts[type] : 0; | |
72 | } | |
73 | ||
74 | /* requires the buffer lock to be held */ | |
75 | static bool __evdev_is_filtered(struct evdev_client *client, | |
76 | unsigned int type, | |
77 | unsigned int code) | |
78 | { | |
79 | unsigned long *mask; | |
80 | size_t cnt; | |
81 | ||
82 | /* EV_SYN and unknown codes are never filtered */ | |
83 | if (type == EV_SYN || type >= EV_CNT) | |
84 | return false; | |
85 | ||
86 | /* first test whether the type is filtered */ | |
87 | mask = client->evmasks[0]; | |
88 | if (mask && !test_bit(type, mask)) | |
89 | return true; | |
90 | ||
91 | /* unknown values are never filtered */ | |
92 | cnt = evdev_get_mask_cnt(type); | |
93 | if (!cnt || code >= cnt) | |
94 | return false; | |
95 | ||
96 | mask = client->evmasks[type]; | |
97 | return mask && !test_bit(code, mask); | |
98 | } | |
99 | ||
48318028 DH |
100 | /* flush queued events of type @type, caller must hold client->buffer_lock */ |
101 | static void __evdev_flush_queue(struct evdev_client *client, unsigned int type) | |
102 | { | |
103 | unsigned int i, head, num; | |
104 | unsigned int mask = client->bufsize - 1; | |
105 | bool is_report; | |
106 | struct input_event *ev; | |
107 | ||
108 | BUG_ON(type == EV_SYN); | |
109 | ||
110 | head = client->tail; | |
111 | client->packet_head = client->tail; | |
112 | ||
113 | /* init to 1 so a leading SYN_REPORT will not be dropped */ | |
114 | num = 1; | |
115 | ||
116 | for (i = client->tail; i != client->head; i = (i + 1) & mask) { | |
117 | ev = &client->buffer[i]; | |
118 | is_report = ev->type == EV_SYN && ev->code == SYN_REPORT; | |
119 | ||
120 | if (ev->type == type) { | |
121 | /* drop matched entry */ | |
122 | continue; | |
123 | } else if (is_report && !num) { | |
124 | /* drop empty SYN_REPORT groups */ | |
125 | continue; | |
126 | } else if (head != i) { | |
127 | /* move entry to fill the gap */ | |
152194fe | 128 | client->buffer[head] = *ev; |
48318028 DH |
129 | } |
130 | ||
131 | num++; | |
132 | head = (head + 1) & mask; | |
133 | ||
134 | if (is_report) { | |
135 | num = 0; | |
136 | client->packet_head = head; | |
137 | } | |
138 | } | |
139 | ||
140 | client->head = head; | |
141 | } | |
142 | ||
b881d537 | 143 | static void __evdev_queue_syn_dropped(struct evdev_client *client) |
48318028 | 144 | { |
3b51c44b AN |
145 | ktime_t *ev_time = input_get_timestamp(client->evdev->handle.dev); |
146 | struct timespec64 ts = ktime_to_timespec64(ev_time[client->clk_type]); | |
48318028 | 147 | struct input_event ev; |
48318028 | 148 | |
152194fe DD |
149 | ev.input_event_sec = ts.tv_sec; |
150 | ev.input_event_usec = ts.tv_nsec / NSEC_PER_USEC; | |
48318028 DH |
151 | ev.type = EV_SYN; |
152 | ev.code = SYN_DROPPED; | |
153 | ev.value = 0; | |
154 | ||
48318028 DH |
155 | client->buffer[client->head++] = ev; |
156 | client->head &= client->bufsize - 1; | |
157 | ||
158 | if (unlikely(client->head == client->tail)) { | |
159 | /* drop queue but keep our SYN_DROPPED event */ | |
160 | client->tail = (client->head - 1) & (client->bufsize - 1); | |
161 | client->packet_head = client->tail; | |
162 | } | |
b881d537 DT |
163 | } |
164 | ||
165 | static void evdev_queue_syn_dropped(struct evdev_client *client) | |
166 | { | |
167 | unsigned long flags; | |
48318028 | 168 | |
b881d537 DT |
169 | spin_lock_irqsave(&client->buffer_lock, flags); |
170 | __evdev_queue_syn_dropped(client); | |
48318028 DH |
171 | spin_unlock_irqrestore(&client->buffer_lock, flags); |
172 | } | |
173 | ||
0c3e9943 AG |
174 | static int evdev_set_clk_type(struct evdev_client *client, unsigned int clkid) |
175 | { | |
b881d537 | 176 | unsigned long flags; |
3b51c44b | 177 | enum input_clock_type clk_type; |
0c3e9943 AG |
178 | |
179 | switch (clkid) { | |
180 | ||
181 | case CLOCK_REALTIME: | |
3b51c44b | 182 | clk_type = INPUT_CLK_REAL; |
0c3e9943 AG |
183 | break; |
184 | case CLOCK_MONOTONIC: | |
3b51c44b | 185 | clk_type = INPUT_CLK_MONO; |
0c3e9943 AG |
186 | break; |
187 | case CLOCK_BOOTTIME: | |
3b51c44b | 188 | clk_type = INPUT_CLK_BOOT; |
0c3e9943 AG |
189 | break; |
190 | default: | |
191 | return -EINVAL; | |
192 | } | |
193 | ||
bf5f18d7 AM |
194 | if (client->clk_type != clk_type) { |
195 | client->clk_type = clk_type; | |
b881d537 | 196 | |
bf5f18d7 AM |
197 | /* |
198 | * Flush pending events and queue SYN_DROPPED event, | |
199 | * but only if the queue is not empty. | |
200 | */ | |
201 | spin_lock_irqsave(&client->buffer_lock, flags); | |
b881d537 | 202 | |
bf5f18d7 AM |
203 | if (client->head != client->tail) { |
204 | client->packet_head = client->head = client->tail; | |
205 | __evdev_queue_syn_dropped(client); | |
206 | } | |
207 | ||
208 | spin_unlock_irqrestore(&client->buffer_lock, flags); | |
209 | } | |
0c3e9943 AG |
210 | |
211 | return 0; | |
212 | } | |
213 | ||
a274ac15 HR |
214 | static void __pass_event(struct evdev_client *client, |
215 | const struct input_event *event) | |
6addb1d6 | 216 | { |
9fb0f14e JB |
217 | client->buffer[client->head++] = *event; |
218 | client->head &= client->bufsize - 1; | |
219 | ||
220 | if (unlikely(client->head == client->tail)) { | |
221 | /* | |
222 | * This effectively "drops" all unconsumed events, leaving | |
223 | * EV_SYN/SYN_DROPPED plus the newest event in the queue. | |
224 | */ | |
225 | client->tail = (client->head - 2) & (client->bufsize - 1); | |
226 | ||
f729a1b0 AB |
227 | client->buffer[client->tail] = (struct input_event) { |
228 | .input_event_sec = event->input_event_sec, | |
229 | .input_event_usec = event->input_event_usec, | |
230 | .type = EV_SYN, | |
231 | .code = SYN_DROPPED, | |
232 | .value = 0, | |
233 | }; | |
9fb0f14e | 234 | |
cdda911c JB |
235 | client->packet_head = client->tail; |
236 | } | |
6addb1d6 | 237 | |
cdda911c JB |
238 | if (event->type == EV_SYN && event->code == SYN_REPORT) { |
239 | client->packet_head = client->head; | |
30a589fd | 240 | kill_fasync(&client->fasync, SIGIO, POLL_IN); |
cdda911c | 241 | } |
a274ac15 HR |
242 | } |
243 | ||
244 | static void evdev_pass_values(struct evdev_client *client, | |
245 | const struct input_value *vals, unsigned int count, | |
aac8bcf1 | 246 | ktime_t *ev_time) |
a274ac15 HR |
247 | { |
248 | struct evdev *evdev = client->evdev; | |
249 | const struct input_value *v; | |
250 | struct input_event event; | |
152194fe | 251 | struct timespec64 ts; |
a274ac15 HR |
252 | bool wakeup = false; |
253 | ||
c7dc6573 DH |
254 | if (client->revoked) |
255 | return; | |
256 | ||
152194fe DD |
257 | ts = ktime_to_timespec64(ev_time[client->clk_type]); |
258 | event.input_event_sec = ts.tv_sec; | |
259 | event.input_event_usec = ts.tv_nsec / NSEC_PER_USEC; | |
a274ac15 HR |
260 | |
261 | /* Interrupts are disabled, just acquire the lock. */ | |
262 | spin_lock(&client->buffer_lock); | |
263 | ||
264 | for (v = vals; v != vals + count; v++) { | |
06a16293 DH |
265 | if (__evdev_is_filtered(client, v->type, v->code)) |
266 | continue; | |
267 | ||
268 | if (v->type == EV_SYN && v->code == SYN_REPORT) { | |
269 | /* drop empty SYN_REPORT */ | |
270 | if (client->packet_head == client->head) | |
271 | continue; | |
272 | ||
273 | wakeup = true; | |
274 | } | |
275 | ||
a274ac15 HR |
276 | event.type = v->type; |
277 | event.code = v->code; | |
278 | event.value = v->value; | |
279 | __pass_event(client, &event); | |
a274ac15 | 280 | } |
cdda911c JB |
281 | |
282 | spin_unlock(&client->buffer_lock); | |
a274ac15 HR |
283 | |
284 | if (wakeup) | |
285 | wake_up_interruptible(&evdev->wait); | |
6addb1d6 DT |
286 | } |
287 | ||
288 | /* | |
a274ac15 | 289 | * Pass incoming events to all connected clients. |
6addb1d6 | 290 | */ |
a274ac15 HR |
291 | static void evdev_events(struct input_handle *handle, |
292 | const struct input_value *vals, unsigned int count) | |
1da177e4 LT |
293 | { |
294 | struct evdev *evdev = handle->private; | |
d0ffb9be | 295 | struct evdev_client *client; |
3b51c44b | 296 | ktime_t *ev_time = input_get_timestamp(handle->dev); |
1da177e4 | 297 | |
82ba56c2 DT |
298 | rcu_read_lock(); |
299 | ||
6addb1d6 | 300 | client = rcu_dereference(evdev->grab); |
a80b83b7 | 301 | |
6addb1d6 | 302 | if (client) |
aac8bcf1 | 303 | evdev_pass_values(client, vals, count, ev_time); |
6addb1d6 DT |
304 | else |
305 | list_for_each_entry_rcu(client, &evdev->client_list, node) | |
aac8bcf1 | 306 | evdev_pass_values(client, vals, count, ev_time); |
1da177e4 | 307 | |
82ba56c2 | 308 | rcu_read_unlock(); |
a274ac15 | 309 | } |
82ba56c2 | 310 | |
a274ac15 HR |
311 | /* |
312 | * Pass incoming event to all connected clients. | |
313 | */ | |
314 | static void evdev_event(struct input_handle *handle, | |
315 | unsigned int type, unsigned int code, int value) | |
316 | { | |
317 | struct input_value vals[] = { { type, code, value } }; | |
318 | ||
319 | evdev_events(handle, vals, 1); | |
1da177e4 LT |
320 | } |
321 | ||
322 | static int evdev_fasync(int fd, struct file *file, int on) | |
323 | { | |
d0ffb9be | 324 | struct evdev_client *client = file->private_data; |
1e0afb28 | 325 | |
60aa4924 | 326 | return fasync_helper(fd, file, on, &client->fasync); |
1da177e4 LT |
327 | } |
328 | ||
1e0afb28 | 329 | static int evdev_flush(struct file *file, fl_owner_t id) |
1da177e4 | 330 | { |
d0ffb9be DT |
331 | struct evdev_client *client = file->private_data; |
332 | struct evdev *evdev = client->evdev; | |
6addb1d6 | 333 | |
eb38f3a4 | 334 | mutex_lock(&evdev->mutex); |
1e0afb28 | 335 | |
eb38f3a4 TI |
336 | if (evdev->exist && !client->revoked) |
337 | input_flush_device(&evdev->handle, file); | |
1e0afb28 | 338 | |
6addb1d6 | 339 | mutex_unlock(&evdev->mutex); |
eb38f3a4 | 340 | return 0; |
1da177e4 LT |
341 | } |
342 | ||
9657d75c | 343 | static void evdev_free(struct device *dev) |
1da177e4 | 344 | { |
9657d75c DT |
345 | struct evdev *evdev = container_of(dev, struct evdev, dev); |
346 | ||
a7097ff8 | 347 | input_put_device(evdev->handle.dev); |
1da177e4 LT |
348 | kfree(evdev); |
349 | } | |
350 | ||
6addb1d6 DT |
351 | /* |
352 | * Grabs an event device (along with underlying input device). | |
353 | * This function is called with evdev->mutex taken. | |
354 | */ | |
355 | static int evdev_grab(struct evdev *evdev, struct evdev_client *client) | |
356 | { | |
357 | int error; | |
358 | ||
359 | if (evdev->grab) | |
360 | return -EBUSY; | |
361 | ||
362 | error = input_grab_device(&evdev->handle); | |
363 | if (error) | |
364 | return error; | |
365 | ||
366 | rcu_assign_pointer(evdev->grab, client); | |
6addb1d6 DT |
367 | |
368 | return 0; | |
369 | } | |
370 | ||
371 | static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client) | |
372 | { | |
dba42580 DT |
373 | struct evdev_client *grab = rcu_dereference_protected(evdev->grab, |
374 | lockdep_is_held(&evdev->mutex)); | |
375 | ||
376 | if (grab != client) | |
6addb1d6 DT |
377 | return -EINVAL; |
378 | ||
379 | rcu_assign_pointer(evdev->grab, NULL); | |
82ba56c2 | 380 | synchronize_rcu(); |
6addb1d6 DT |
381 | input_release_device(&evdev->handle); |
382 | ||
383 | return 0; | |
384 | } | |
385 | ||
386 | static void evdev_attach_client(struct evdev *evdev, | |
387 | struct evdev_client *client) | |
388 | { | |
389 | spin_lock(&evdev->client_lock); | |
390 | list_add_tail_rcu(&client->node, &evdev->client_list); | |
391 | spin_unlock(&evdev->client_lock); | |
6addb1d6 DT |
392 | } |
393 | ||
394 | static void evdev_detach_client(struct evdev *evdev, | |
395 | struct evdev_client *client) | |
396 | { | |
397 | spin_lock(&evdev->client_lock); | |
398 | list_del_rcu(&client->node); | |
399 | spin_unlock(&evdev->client_lock); | |
82ba56c2 | 400 | synchronize_rcu(); |
6addb1d6 DT |
401 | } |
402 | ||
403 | static int evdev_open_device(struct evdev *evdev) | |
404 | { | |
405 | int retval; | |
406 | ||
407 | retval = mutex_lock_interruptible(&evdev->mutex); | |
408 | if (retval) | |
409 | return retval; | |
410 | ||
411 | if (!evdev->exist) | |
412 | retval = -ENODEV; | |
06445014 | 413 | else if (!evdev->open++) { |
6addb1d6 | 414 | retval = input_open_device(&evdev->handle); |
06445014 ON |
415 | if (retval) |
416 | evdev->open--; | |
417 | } | |
6addb1d6 DT |
418 | |
419 | mutex_unlock(&evdev->mutex); | |
420 | return retval; | |
421 | } | |
422 | ||
423 | static void evdev_close_device(struct evdev *evdev) | |
424 | { | |
425 | mutex_lock(&evdev->mutex); | |
426 | ||
427 | if (evdev->exist && !--evdev->open) | |
428 | input_close_device(&evdev->handle); | |
429 | ||
430 | mutex_unlock(&evdev->mutex); | |
431 | } | |
432 | ||
433 | /* | |
434 | * Wake up users waiting for IO so they can disconnect from | |
435 | * dead device. | |
436 | */ | |
437 | static void evdev_hangup(struct evdev *evdev) | |
438 | { | |
439 | struct evdev_client *client; | |
440 | ||
441 | spin_lock(&evdev->client_lock); | |
442 | list_for_each_entry(client, &evdev->client_list, node) | |
443 | kill_fasync(&client->fasync, SIGIO, POLL_HUP); | |
444 | spin_unlock(&evdev->client_lock); | |
445 | ||
446 | wake_up_interruptible(&evdev->wait); | |
447 | } | |
448 | ||
d0ffb9be | 449 | static int evdev_release(struct inode *inode, struct file *file) |
1da177e4 | 450 | { |
d0ffb9be DT |
451 | struct evdev_client *client = file->private_data; |
452 | struct evdev *evdev = client->evdev; | |
06a16293 | 453 | unsigned int i; |
1da177e4 | 454 | |
6addb1d6 | 455 | mutex_lock(&evdev->mutex); |
dba42580 | 456 | evdev_ungrab(evdev, client); |
6addb1d6 | 457 | mutex_unlock(&evdev->mutex); |
1da177e4 | 458 | |
6addb1d6 | 459 | evdev_detach_client(evdev, client); |
92eb77d0 | 460 | |
06a16293 | 461 | for (i = 0; i < EV_CNT; ++i) |
6078091c | 462 | bitmap_free(client->evmasks[i]); |
06a16293 | 463 | |
67367fd2 | 464 | kvfree(client); |
1da177e4 | 465 | |
6addb1d6 | 466 | evdev_close_device(evdev); |
1da177e4 | 467 | |
1da177e4 LT |
468 | return 0; |
469 | } | |
470 | ||
b58f7086 HR |
471 | static unsigned int evdev_compute_buffer_size(struct input_dev *dev) |
472 | { | |
63a6404d HR |
473 | unsigned int n_events = |
474 | max(dev->hint_events_per_packet * EVDEV_BUF_PACKETS, | |
475 | EVDEV_MIN_BUFFER_SIZE); | |
476 | ||
477 | return roundup_pow_of_two(n_events); | |
b58f7086 HR |
478 | } |
479 | ||
d0ffb9be | 480 | static int evdev_open(struct inode *inode, struct file *file) |
1da177e4 | 481 | { |
7f8d4cad DT |
482 | struct evdev *evdev = container_of(inode->i_cdev, struct evdev, cdev); |
483 | unsigned int bufsize = evdev_compute_buffer_size(evdev->handle.dev); | |
6addb1d6 | 484 | struct evdev_client *client; |
d542ed82 | 485 | int error; |
1da177e4 | 486 | |
7f439bc2 | 487 | client = kvzalloc(struct_size(client, buffer, bufsize), GFP_KERNEL); |
7f8d4cad DT |
488 | if (!client) |
489 | return -ENOMEM; | |
1da177e4 | 490 | |
b58f7086 | 491 | client->bufsize = bufsize; |
6addb1d6 | 492 | spin_lock_init(&client->buffer_lock); |
d0ffb9be | 493 | client->evdev = evdev; |
6addb1d6 | 494 | evdev_attach_client(evdev, client); |
1da177e4 | 495 | |
6addb1d6 DT |
496 | error = evdev_open_device(evdev); |
497 | if (error) | |
498 | goto err_free_client; | |
1da177e4 | 499 | |
d0ffb9be | 500 | file->private_data = client; |
c5bf68fe | 501 | stream_open(inode, file); |
3d7bbd45 | 502 | |
1da177e4 | 503 | return 0; |
9657d75c DT |
504 | |
505 | err_free_client: | |
6addb1d6 | 506 | evdev_detach_client(evdev, client); |
92788ac1 | 507 | kvfree(client); |
9657d75c | 508 | return error; |
1da177e4 LT |
509 | } |
510 | ||
6addb1d6 DT |
511 | static ssize_t evdev_write(struct file *file, const char __user *buffer, |
512 | size_t count, loff_t *ppos) | |
3a51f7c4 | 513 | { |
d0ffb9be DT |
514 | struct evdev_client *client = file->private_data; |
515 | struct evdev *evdev = client->evdev; | |
3a51f7c4 | 516 | struct input_event event; |
02dfc496 | 517 | int retval = 0; |
52658bb6 | 518 | |
2872a9b5 | 519 | if (count != 0 && count < input_event_size()) |
439581ec PK |
520 | return -EINVAL; |
521 | ||
6addb1d6 DT |
522 | retval = mutex_lock_interruptible(&evdev->mutex); |
523 | if (retval) | |
524 | return retval; | |
525 | ||
c7dc6573 | 526 | if (!evdev->exist || client->revoked) { |
6addb1d6 DT |
527 | retval = -ENODEV; |
528 | goto out; | |
529 | } | |
52658bb6 | 530 | |
2872a9b5 DT |
531 | while (retval + input_event_size() <= count) { |
532 | ||
2d56f3a3 | 533 | if (input_event_from_user(buffer + retval, &event)) { |
6addb1d6 DT |
534 | retval = -EFAULT; |
535 | goto out; | |
536 | } | |
439581ec | 537 | retval += input_event_size(); |
6addb1d6 DT |
538 | |
539 | input_inject_event(&evdev->handle, | |
540 | event.type, event.code, event.value); | |
36d2582f | 541 | cond_resched(); |
2872a9b5 | 542 | } |
52658bb6 | 543 | |
6addb1d6 DT |
544 | out: |
545 | mutex_unlock(&evdev->mutex); | |
52658bb6 JK |
546 | return retval; |
547 | } | |
52658bb6 | 548 | |
6addb1d6 DT |
549 | static int evdev_fetch_next_event(struct evdev_client *client, |
550 | struct input_event *event) | |
551 | { | |
552 | int have_event; | |
553 | ||
554 | spin_lock_irq(&client->buffer_lock); | |
555 | ||
566cf5b6 | 556 | have_event = client->packet_head != client->tail; |
6addb1d6 DT |
557 | if (have_event) { |
558 | *event = client->buffer[client->tail++]; | |
b58f7086 | 559 | client->tail &= client->bufsize - 1; |
6addb1d6 DT |
560 | } |
561 | ||
562 | spin_unlock_irq(&client->buffer_lock); | |
563 | ||
564 | return have_event; | |
565 | } | |
566 | ||
567 | static ssize_t evdev_read(struct file *file, char __user *buffer, | |
568 | size_t count, loff_t *ppos) | |
1da177e4 | 569 | { |
d0ffb9be DT |
570 | struct evdev_client *client = file->private_data; |
571 | struct evdev *evdev = client->evdev; | |
6addb1d6 | 572 | struct input_event event; |
2872a9b5 DT |
573 | size_t read = 0; |
574 | int error; | |
1da177e4 | 575 | |
2872a9b5 | 576 | if (count != 0 && count < input_event_size()) |
1da177e4 LT |
577 | return -EINVAL; |
578 | ||
2872a9b5 | 579 | for (;;) { |
c7dc6573 | 580 | if (!evdev->exist || client->revoked) |
2872a9b5 | 581 | return -ENODEV; |
1da177e4 | 582 | |
2872a9b5 DT |
583 | if (client->packet_head == client->tail && |
584 | (file->f_flags & O_NONBLOCK)) | |
585 | return -EAGAIN; | |
586 | ||
587 | /* | |
588 | * count == 0 is special - no IO is done but we check | |
589 | * for error conditions (see above). | |
590 | */ | |
591 | if (count == 0) | |
592 | break; | |
1da177e4 | 593 | |
2872a9b5 DT |
594 | while (read + input_event_size() <= count && |
595 | evdev_fetch_next_event(client, &event)) { | |
3a51f7c4 | 596 | |
2872a9b5 DT |
597 | if (input_event_to_user(buffer + read, &event)) |
598 | return -EFAULT; | |
3a51f7c4 | 599 | |
2872a9b5 DT |
600 | read += input_event_size(); |
601 | } | |
1da177e4 | 602 | |
2872a9b5 DT |
603 | if (read) |
604 | break; | |
e90f869c | 605 | |
2872a9b5 DT |
606 | if (!(file->f_flags & O_NONBLOCK)) { |
607 | error = wait_event_interruptible(evdev->wait, | |
608 | client->packet_head != client->tail || | |
c7dc6573 | 609 | !evdev->exist || client->revoked); |
2872a9b5 DT |
610 | if (error) |
611 | return error; | |
612 | } | |
613 | } | |
614 | ||
615 | return read; | |
1da177e4 LT |
616 | } |
617 | ||
618 | /* No kernel lock - fine */ | |
afc9a42b | 619 | static __poll_t evdev_poll(struct file *file, poll_table *wait) |
1da177e4 | 620 | { |
d0ffb9be DT |
621 | struct evdev_client *client = file->private_data; |
622 | struct evdev *evdev = client->evdev; | |
afc9a42b | 623 | __poll_t mask; |
1e0afb28 | 624 | |
d0ffb9be | 625 | poll_wait(file, &evdev->wait, wait); |
c18fb139 | 626 | |
c7dc6573 | 627 | if (evdev->exist && !client->revoked) |
a9a08845 | 628 | mask = EPOLLOUT | EPOLLWRNORM; |
c7dc6573 | 629 | else |
a9a08845 | 630 | mask = EPOLLHUP | EPOLLERR; |
c7dc6573 | 631 | |
cdda911c | 632 | if (client->packet_head != client->tail) |
a9a08845 | 633 | mask |= EPOLLIN | EPOLLRDNORM; |
c18fb139 DT |
634 | |
635 | return mask; | |
1da177e4 LT |
636 | } |
637 | ||
3a51f7c4 DT |
638 | #ifdef CONFIG_COMPAT |
639 | ||
640 | #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) | |
7b19ada2 | 641 | #define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1) |
3a51f7c4 DT |
642 | |
643 | #ifdef __BIG_ENDIAN | |
644 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
645 | unsigned int maxlen, void __user *p, int compat) | |
646 | { | |
647 | int len, i; | |
648 | ||
649 | if (compat) { | |
7b19ada2 | 650 | len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t); |
bf61f8d3 | 651 | if (len > maxlen) |
3a51f7c4 DT |
652 | len = maxlen; |
653 | ||
654 | for (i = 0; i < len / sizeof(compat_long_t); i++) | |
655 | if (copy_to_user((compat_long_t __user *) p + i, | |
656 | (compat_long_t *) bits + | |
657 | i + 1 - ((i % 2) << 1), | |
658 | sizeof(compat_long_t))) | |
659 | return -EFAULT; | |
660 | } else { | |
7b19ada2 | 661 | len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
662 | if (len > maxlen) |
663 | len = maxlen; | |
664 | ||
665 | if (copy_to_user(p, bits, len)) | |
666 | return -EFAULT; | |
667 | } | |
668 | ||
669 | return len; | |
670 | } | |
06a16293 DH |
671 | |
672 | static int bits_from_user(unsigned long *bits, unsigned int maxbit, | |
673 | unsigned int maxlen, const void __user *p, int compat) | |
674 | { | |
675 | int len, i; | |
676 | ||
677 | if (compat) { | |
678 | if (maxlen % sizeof(compat_long_t)) | |
679 | return -EINVAL; | |
680 | ||
681 | len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t); | |
682 | if (len > maxlen) | |
683 | len = maxlen; | |
684 | ||
685 | for (i = 0; i < len / sizeof(compat_long_t); i++) | |
686 | if (copy_from_user((compat_long_t *) bits + | |
687 | i + 1 - ((i % 2) << 1), | |
688 | (compat_long_t __user *) p + i, | |
689 | sizeof(compat_long_t))) | |
690 | return -EFAULT; | |
691 | if (i % 2) | |
692 | *((compat_long_t *) bits + i - 1) = 0; | |
693 | ||
694 | } else { | |
695 | if (maxlen % sizeof(long)) | |
696 | return -EINVAL; | |
697 | ||
698 | len = BITS_TO_LONGS(maxbit) * sizeof(long); | |
699 | if (len > maxlen) | |
700 | len = maxlen; | |
701 | ||
702 | if (copy_from_user(bits, p, len)) | |
703 | return -EFAULT; | |
704 | } | |
705 | ||
706 | return len; | |
707 | } | |
708 | ||
3a51f7c4 | 709 | #else |
06a16293 | 710 | |
3a51f7c4 DT |
711 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, |
712 | unsigned int maxlen, void __user *p, int compat) | |
713 | { | |
714 | int len = compat ? | |
7b19ada2 JS |
715 | BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) : |
716 | BITS_TO_LONGS(maxbit) * sizeof(long); | |
3a51f7c4 DT |
717 | |
718 | if (len > maxlen) | |
719 | len = maxlen; | |
720 | ||
721 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
722 | } | |
06a16293 DH |
723 | |
724 | static int bits_from_user(unsigned long *bits, unsigned int maxbit, | |
725 | unsigned int maxlen, const void __user *p, int compat) | |
726 | { | |
727 | size_t chunk_size = compat ? sizeof(compat_long_t) : sizeof(long); | |
728 | int len; | |
729 | ||
730 | if (maxlen % chunk_size) | |
731 | return -EINVAL; | |
732 | ||
733 | len = compat ? BITS_TO_LONGS_COMPAT(maxbit) : BITS_TO_LONGS(maxbit); | |
734 | len *= chunk_size; | |
735 | if (len > maxlen) | |
736 | len = maxlen; | |
737 | ||
738 | return copy_from_user(bits, p, len) ? -EFAULT : len; | |
739 | } | |
740 | ||
3a51f7c4 DT |
741 | #endif /* __BIG_ENDIAN */ |
742 | ||
743 | #else | |
744 | ||
745 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
746 | unsigned int maxlen, void __user *p, int compat) | |
747 | { | |
7b19ada2 | 748 | int len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
749 | |
750 | if (len > maxlen) | |
751 | len = maxlen; | |
752 | ||
753 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
754 | } | |
755 | ||
06a16293 DH |
756 | static int bits_from_user(unsigned long *bits, unsigned int maxbit, |
757 | unsigned int maxlen, const void __user *p, int compat) | |
758 | { | |
759 | int len; | |
760 | ||
761 | if (maxlen % sizeof(long)) | |
762 | return -EINVAL; | |
763 | ||
764 | len = BITS_TO_LONGS(maxbit) * sizeof(long); | |
765 | if (len > maxlen) | |
766 | len = maxlen; | |
767 | ||
768 | return copy_from_user(bits, p, len) ? -EFAULT : len; | |
769 | } | |
770 | ||
3a51f7c4 DT |
771 | #endif /* CONFIG_COMPAT */ |
772 | ||
773 | static int str_to_user(const char *str, unsigned int maxlen, void __user *p) | |
774 | { | |
775 | int len; | |
776 | ||
777 | if (!str) | |
778 | return -ENOENT; | |
779 | ||
780 | len = strlen(str) + 1; | |
781 | if (len > maxlen) | |
782 | len = maxlen; | |
783 | ||
784 | return copy_to_user(p, str, len) ? -EFAULT : len; | |
785 | } | |
786 | ||
448cd166 DT |
787 | static int handle_eviocgbit(struct input_dev *dev, |
788 | unsigned int type, unsigned int size, | |
789 | void __user *p, int compat_mode) | |
5402a734 LT |
790 | { |
791 | unsigned long *bits; | |
792 | int len; | |
793 | ||
448cd166 | 794 | switch (type) { |
5402a734 LT |
795 | |
796 | case 0: bits = dev->evbit; len = EV_MAX; break; | |
797 | case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; | |
798 | case EV_REL: bits = dev->relbit; len = REL_MAX; break; | |
799 | case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; | |
800 | case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; | |
801 | case EV_LED: bits = dev->ledbit; len = LED_MAX; break; | |
802 | case EV_SND: bits = dev->sndbit; len = SND_MAX; break; | |
803 | case EV_FF: bits = dev->ffbit; len = FF_MAX; break; | |
804 | case EV_SW: bits = dev->swbit; len = SW_MAX; break; | |
805 | default: return -EINVAL; | |
806 | } | |
f2afa771 | 807 | |
448cd166 | 808 | return bits_to_user(bits, len, size, p, compat_mode); |
5402a734 | 809 | } |
5402a734 | 810 | |
ab4e0192 | 811 | static int evdev_handle_get_keycode(struct input_dev *dev, void __user *p) |
8613e4c2 | 812 | { |
ab4e0192 DT |
813 | struct input_keymap_entry ke = { |
814 | .len = sizeof(unsigned int), | |
815 | .flags = 0, | |
816 | }; | |
817 | int __user *ip = (int __user *)p; | |
8613e4c2 MCC |
818 | int error; |
819 | ||
ab4e0192 DT |
820 | /* legacy case */ |
821 | if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) | |
822 | return -EFAULT; | |
8613e4c2 | 823 | |
ab4e0192 DT |
824 | error = input_get_keycode(dev, &ke); |
825 | if (error) | |
826 | return error; | |
8613e4c2 | 827 | |
ab4e0192 DT |
828 | if (put_user(ke.keycode, ip + 1)) |
829 | return -EFAULT; | |
8613e4c2 | 830 | |
ab4e0192 DT |
831 | return 0; |
832 | } | |
8613e4c2 | 833 | |
ab4e0192 DT |
834 | static int evdev_handle_get_keycode_v2(struct input_dev *dev, void __user *p) |
835 | { | |
836 | struct input_keymap_entry ke; | |
837 | int error; | |
8613e4c2 | 838 | |
ab4e0192 DT |
839 | if (copy_from_user(&ke, p, sizeof(ke))) |
840 | return -EFAULT; | |
8613e4c2 | 841 | |
ab4e0192 DT |
842 | error = input_get_keycode(dev, &ke); |
843 | if (error) | |
844 | return error; | |
8613e4c2 | 845 | |
ab4e0192 DT |
846 | if (copy_to_user(p, &ke, sizeof(ke))) |
847 | return -EFAULT; | |
8613e4c2 | 848 | |
8613e4c2 MCC |
849 | return 0; |
850 | } | |
851 | ||
ab4e0192 | 852 | static int evdev_handle_set_keycode(struct input_dev *dev, void __user *p) |
8613e4c2 | 853 | { |
ab4e0192 DT |
854 | struct input_keymap_entry ke = { |
855 | .len = sizeof(unsigned int), | |
856 | .flags = 0, | |
857 | }; | |
858 | int __user *ip = (int __user *)p; | |
8613e4c2 | 859 | |
ab4e0192 DT |
860 | if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) |
861 | return -EFAULT; | |
8613e4c2 | 862 | |
ab4e0192 DT |
863 | if (get_user(ke.keycode, ip + 1)) |
864 | return -EFAULT; | |
8613e4c2 | 865 | |
ab4e0192 DT |
866 | return input_set_keycode(dev, &ke); |
867 | } | |
8613e4c2 | 868 | |
ab4e0192 DT |
869 | static int evdev_handle_set_keycode_v2(struct input_dev *dev, void __user *p) |
870 | { | |
871 | struct input_keymap_entry ke; | |
8613e4c2 | 872 | |
ab4e0192 DT |
873 | if (copy_from_user(&ke, p, sizeof(ke))) |
874 | return -EFAULT; | |
8613e4c2 | 875 | |
ab4e0192 DT |
876 | if (ke.len > sizeof(ke.scancode)) |
877 | return -EINVAL; | |
8613e4c2 MCC |
878 | |
879 | return input_set_keycode(dev, &ke); | |
880 | } | |
881 | ||
48318028 DH |
882 | /* |
883 | * If we transfer state to the user, we should flush all pending events | |
884 | * of the same type from the client's queue. Otherwise, they might end up | |
885 | * with duplicate events, which can screw up client's state tracking. | |
886 | * If bits_to_user fails after flushing the queue, we queue a SYN_DROPPED | |
887 | * event so user-space will notice missing events. | |
888 | * | |
889 | * LOCKING: | |
890 | * We need to take event_lock before buffer_lock to avoid dead-locks. But we | |
891 | * need the even_lock only to guarantee consistent state. We can safely release | |
892 | * it while flushing the queue. This allows input-core to handle filters while | |
893 | * we flush the queue. | |
894 | */ | |
895 | static int evdev_handle_get_val(struct evdev_client *client, | |
896 | struct input_dev *dev, unsigned int type, | |
7c4f5607 DT |
897 | unsigned long *bits, unsigned int maxbit, |
898 | unsigned int maxlen, void __user *p, | |
899 | int compat) | |
48318028 DH |
900 | { |
901 | int ret; | |
902 | unsigned long *mem; | |
903 | ||
6078091c | 904 | mem = bitmap_alloc(maxbit, GFP_KERNEL); |
48318028 DH |
905 | if (!mem) |
906 | return -ENOMEM; | |
907 | ||
908 | spin_lock_irq(&dev->event_lock); | |
909 | spin_lock(&client->buffer_lock); | |
910 | ||
6078091c | 911 | bitmap_copy(mem, bits, maxbit); |
48318028 DH |
912 | |
913 | spin_unlock(&dev->event_lock); | |
914 | ||
915 | __evdev_flush_queue(client, type); | |
916 | ||
917 | spin_unlock_irq(&client->buffer_lock); | |
918 | ||
7c4f5607 | 919 | ret = bits_to_user(mem, maxbit, maxlen, p, compat); |
48318028 | 920 | if (ret < 0) |
b881d537 | 921 | evdev_queue_syn_dropped(client); |
48318028 | 922 | |
6078091c | 923 | bitmap_free(mem); |
48318028 DH |
924 | |
925 | return ret; | |
926 | } | |
927 | ||
1cf0c6e6 HR |
928 | static int evdev_handle_mt_request(struct input_dev *dev, |
929 | unsigned int size, | |
930 | int __user *ip) | |
931 | { | |
8d18fba2 | 932 | const struct input_mt *mt = dev->mt; |
1cf0c6e6 HR |
933 | unsigned int code; |
934 | int max_slots; | |
935 | int i; | |
936 | ||
937 | if (get_user(code, &ip[0])) | |
938 | return -EFAULT; | |
8d18fba2 | 939 | if (!mt || !input_is_mt_value(code)) |
1cf0c6e6 HR |
940 | return -EINVAL; |
941 | ||
942 | max_slots = (size - sizeof(__u32)) / sizeof(__s32); | |
8d18fba2 HR |
943 | for (i = 0; i < mt->num_slots && i < max_slots; i++) { |
944 | int value = input_mt_get_value(&mt->slots[i], code); | |
945 | if (put_user(value, &ip[1 + i])) | |
1cf0c6e6 | 946 | return -EFAULT; |
8d18fba2 | 947 | } |
1cf0c6e6 HR |
948 | |
949 | return 0; | |
950 | } | |
951 | ||
c7dc6573 DH |
952 | static int evdev_revoke(struct evdev *evdev, struct evdev_client *client, |
953 | struct file *file) | |
954 | { | |
955 | client->revoked = true; | |
956 | evdev_ungrab(evdev, client); | |
957 | input_flush_device(&evdev->handle, file); | |
958 | wake_up_interruptible(&evdev->wait); | |
959 | ||
960 | return 0; | |
961 | } | |
962 | ||
06a16293 DH |
963 | /* must be called with evdev-mutex held */ |
964 | static int evdev_set_mask(struct evdev_client *client, | |
965 | unsigned int type, | |
966 | const void __user *codes, | |
967 | u32 codes_size, | |
968 | int compat) | |
969 | { | |
970 | unsigned long flags, *mask, *oldmask; | |
971 | size_t cnt; | |
972 | int error; | |
973 | ||
974 | /* we allow unknown types and 'codes_size > size' for forward-compat */ | |
975 | cnt = evdev_get_mask_cnt(type); | |
976 | if (!cnt) | |
977 | return 0; | |
978 | ||
6078091c | 979 | mask = bitmap_zalloc(cnt, GFP_KERNEL); |
06a16293 DH |
980 | if (!mask) |
981 | return -ENOMEM; | |
982 | ||
983 | error = bits_from_user(mask, cnt - 1, codes_size, codes, compat); | |
984 | if (error < 0) { | |
6078091c | 985 | bitmap_free(mask); |
06a16293 DH |
986 | return error; |
987 | } | |
988 | ||
989 | spin_lock_irqsave(&client->buffer_lock, flags); | |
990 | oldmask = client->evmasks[type]; | |
991 | client->evmasks[type] = mask; | |
992 | spin_unlock_irqrestore(&client->buffer_lock, flags); | |
993 | ||
6078091c | 994 | bitmap_free(oldmask); |
06a16293 DH |
995 | |
996 | return 0; | |
997 | } | |
998 | ||
999 | /* must be called with evdev-mutex held */ | |
1000 | static int evdev_get_mask(struct evdev_client *client, | |
1001 | unsigned int type, | |
1002 | void __user *codes, | |
1003 | u32 codes_size, | |
1004 | int compat) | |
1005 | { | |
1006 | unsigned long *mask; | |
1007 | size_t cnt, size, xfer_size; | |
1008 | int i; | |
1009 | int error; | |
1010 | ||
1011 | /* we allow unknown types and 'codes_size > size' for forward-compat */ | |
1012 | cnt = evdev_get_mask_cnt(type); | |
1013 | size = sizeof(unsigned long) * BITS_TO_LONGS(cnt); | |
1014 | xfer_size = min_t(size_t, codes_size, size); | |
1015 | ||
1016 | if (cnt > 0) { | |
1017 | mask = client->evmasks[type]; | |
1018 | if (mask) { | |
1019 | error = bits_to_user(mask, cnt - 1, | |
1020 | xfer_size, codes, compat); | |
1021 | if (error < 0) | |
1022 | return error; | |
1023 | } else { | |
1024 | /* fake mask with all bits set */ | |
1025 | for (i = 0; i < xfer_size; i++) | |
1026 | if (put_user(0xffU, (u8 __user *)codes + i)) | |
1027 | return -EFAULT; | |
1028 | } | |
1029 | } | |
1030 | ||
1031 | if (xfer_size < codes_size) | |
1032 | if (clear_user(codes + xfer_size, codes_size - xfer_size)) | |
1033 | return -EFAULT; | |
1034 | ||
1035 | return 0; | |
1036 | } | |
1037 | ||
6addb1d6 DT |
1038 | static long evdev_do_ioctl(struct file *file, unsigned int cmd, |
1039 | void __user *p, int compat_mode) | |
1da177e4 | 1040 | { |
d0ffb9be DT |
1041 | struct evdev_client *client = file->private_data; |
1042 | struct evdev *evdev = client->evdev; | |
1da177e4 LT |
1043 | struct input_dev *dev = evdev->handle.dev; |
1044 | struct input_absinfo abs; | |
06a16293 | 1045 | struct input_mask mask; |
509ca1a9 | 1046 | struct ff_effect effect; |
3a51f7c4 | 1047 | int __user *ip = (int __user *)p; |
58b93995 | 1048 | unsigned int i, t, u, v; |
448cd166 | 1049 | unsigned int size; |
509ca1a9 | 1050 | int error; |
1da177e4 | 1051 | |
448cd166 | 1052 | /* First we check for fixed-length commands */ |
1da177e4 LT |
1053 | switch (cmd) { |
1054 | ||
6addb1d6 DT |
1055 | case EVIOCGVERSION: |
1056 | return put_user(EV_VERSION, ip); | |
1da177e4 | 1057 | |
6addb1d6 DT |
1058 | case EVIOCGID: |
1059 | if (copy_to_user(p, &dev->id, sizeof(struct input_id))) | |
1060 | return -EFAULT; | |
1061 | return 0; | |
08791e5c | 1062 | |
6addb1d6 DT |
1063 | case EVIOCGREP: |
1064 | if (!test_bit(EV_REP, dev->evbit)) | |
1065 | return -ENOSYS; | |
1066 | if (put_user(dev->rep[REP_DELAY], ip)) | |
1067 | return -EFAULT; | |
1068 | if (put_user(dev->rep[REP_PERIOD], ip + 1)) | |
1069 | return -EFAULT; | |
1070 | return 0; | |
08791e5c | 1071 | |
6addb1d6 DT |
1072 | case EVIOCSREP: |
1073 | if (!test_bit(EV_REP, dev->evbit)) | |
1074 | return -ENOSYS; | |
1075 | if (get_user(u, ip)) | |
1076 | return -EFAULT; | |
1077 | if (get_user(v, ip + 1)) | |
1078 | return -EFAULT; | |
08791e5c | 1079 | |
6addb1d6 DT |
1080 | input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u); |
1081 | input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v); | |
3a51f7c4 | 1082 | |
6addb1d6 | 1083 | return 0; |
1da177e4 | 1084 | |
6addb1d6 DT |
1085 | case EVIOCRMFF: |
1086 | return input_ff_erase(dev, (int)(unsigned long) p, file); | |
1da177e4 | 1087 | |
6addb1d6 DT |
1088 | case EVIOCGEFFECTS: |
1089 | i = test_bit(EV_FF, dev->evbit) ? | |
1090 | dev->ff->max_effects : 0; | |
1091 | if (put_user(i, ip)) | |
1092 | return -EFAULT; | |
1093 | return 0; | |
1094 | ||
1095 | case EVIOCGRAB: | |
1096 | if (p) | |
1097 | return evdev_grab(evdev, client); | |
1098 | else | |
1099 | return evdev_ungrab(evdev, client); | |
ab4e0192 | 1100 | |
c7dc6573 DH |
1101 | case EVIOCREVOKE: |
1102 | if (p) | |
1103 | return -EINVAL; | |
1104 | else | |
1105 | return evdev_revoke(evdev, client, file); | |
1106 | ||
06a16293 DH |
1107 | case EVIOCGMASK: { |
1108 | void __user *codes_ptr; | |
1109 | ||
1110 | if (copy_from_user(&mask, p, sizeof(mask))) | |
1111 | return -EFAULT; | |
1112 | ||
1113 | codes_ptr = (void __user *)(unsigned long)mask.codes_ptr; | |
1114 | return evdev_get_mask(client, | |
1115 | mask.type, codes_ptr, mask.codes_size, | |
1116 | compat_mode); | |
1117 | } | |
1118 | ||
1119 | case EVIOCSMASK: { | |
1120 | const void __user *codes_ptr; | |
1121 | ||
1122 | if (copy_from_user(&mask, p, sizeof(mask))) | |
1123 | return -EFAULT; | |
1124 | ||
1125 | codes_ptr = (const void __user *)(unsigned long)mask.codes_ptr; | |
1126 | return evdev_set_mask(client, | |
1127 | mask.type, codes_ptr, mask.codes_size, | |
1128 | compat_mode); | |
1129 | } | |
1130 | ||
a80b83b7 JS |
1131 | case EVIOCSCLOCKID: |
1132 | if (copy_from_user(&i, p, sizeof(unsigned int))) | |
1133 | return -EFAULT; | |
aac8bcf1 AM |
1134 | |
1135 | return evdev_set_clk_type(client, i); | |
a80b83b7 | 1136 | |
ab4e0192 DT |
1137 | case EVIOCGKEYCODE: |
1138 | return evdev_handle_get_keycode(dev, p); | |
1139 | ||
1140 | case EVIOCSKEYCODE: | |
1141 | return evdev_handle_set_keycode(dev, p); | |
1142 | ||
1143 | case EVIOCGKEYCODE_V2: | |
1144 | return evdev_handle_get_keycode_v2(dev, p); | |
1145 | ||
1146 | case EVIOCSKEYCODE_V2: | |
1147 | return evdev_handle_set_keycode_v2(dev, p); | |
448cd166 | 1148 | } |
1da177e4 | 1149 | |
448cd166 | 1150 | size = _IOC_SIZE(cmd); |
1da177e4 | 1151 | |
448cd166 DT |
1152 | /* Now check variable-length commands */ |
1153 | #define EVIOC_MASK_SIZE(nr) ((nr) & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) | |
448cd166 | 1154 | switch (EVIOC_MASK_SIZE(cmd)) { |
41e979f8 | 1155 | |
85b77200 HR |
1156 | case EVIOCGPROP(0): |
1157 | return bits_to_user(dev->propbit, INPUT_PROP_MAX, | |
1158 | size, p, compat_mode); | |
1159 | ||
1cf0c6e6 HR |
1160 | case EVIOCGMTSLOTS(0): |
1161 | return evdev_handle_mt_request(dev, size, ip); | |
1162 | ||
448cd166 | 1163 | case EVIOCGKEY(0): |
48318028 DH |
1164 | return evdev_handle_get_val(client, dev, EV_KEY, dev->key, |
1165 | KEY_MAX, size, p, compat_mode); | |
1da177e4 | 1166 | |
448cd166 | 1167 | case EVIOCGLED(0): |
48318028 DH |
1168 | return evdev_handle_get_val(client, dev, EV_LED, dev->led, |
1169 | LED_MAX, size, p, compat_mode); | |
1da177e4 | 1170 | |
448cd166 | 1171 | case EVIOCGSND(0): |
48318028 DH |
1172 | return evdev_handle_get_val(client, dev, EV_SND, dev->snd, |
1173 | SND_MAX, size, p, compat_mode); | |
1da177e4 | 1174 | |
448cd166 | 1175 | case EVIOCGSW(0): |
48318028 DH |
1176 | return evdev_handle_get_val(client, dev, EV_SW, dev->sw, |
1177 | SW_MAX, size, p, compat_mode); | |
31581066 | 1178 | |
448cd166 DT |
1179 | case EVIOCGNAME(0): |
1180 | return str_to_user(dev->name, size, p); | |
1da177e4 | 1181 | |
448cd166 DT |
1182 | case EVIOCGPHYS(0): |
1183 | return str_to_user(dev->phys, size, p); | |
1da177e4 | 1184 | |
448cd166 DT |
1185 | case EVIOCGUNIQ(0): |
1186 | return str_to_user(dev->uniq, size, p); | |
1da177e4 | 1187 | |
448cd166 DT |
1188 | case EVIOC_MASK_SIZE(EVIOCSFF): |
1189 | if (input_ff_effect_from_user(p, size, &effect)) | |
1190 | return -EFAULT; | |
1da177e4 | 1191 | |
448cd166 | 1192 | error = input_ff_upload(dev, &effect, file); |
fc7392aa EV |
1193 | if (error) |
1194 | return error; | |
1da177e4 | 1195 | |
448cd166 DT |
1196 | if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) |
1197 | return -EFAULT; | |
41e979f8 | 1198 | |
fc7392aa | 1199 | return 0; |
448cd166 | 1200 | } |
1da177e4 | 1201 | |
448cd166 DT |
1202 | /* Multi-number variable-length handlers */ |
1203 | if (_IOC_TYPE(cmd) != 'E') | |
1204 | return -EINVAL; | |
1da177e4 | 1205 | |
448cd166 | 1206 | if (_IOC_DIR(cmd) == _IOC_READ) { |
6addb1d6 | 1207 | |
448cd166 DT |
1208 | if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0))) |
1209 | return handle_eviocgbit(dev, | |
1210 | _IOC_NR(cmd) & EV_MAX, size, | |
1211 | p, compat_mode); | |
1da177e4 | 1212 | |
448cd166 | 1213 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { |
f2278f31 | 1214 | |
0a74a1df DM |
1215 | if (!dev->absinfo) |
1216 | return -EINVAL; | |
1217 | ||
448cd166 DT |
1218 | t = _IOC_NR(cmd) & ABS_MAX; |
1219 | abs = dev->absinfo[t]; | |
f2278f31 | 1220 | |
448cd166 DT |
1221 | if (copy_to_user(p, &abs, min_t(size_t, |
1222 | size, sizeof(struct input_absinfo)))) | |
1223 | return -EFAULT; | |
f2278f31 | 1224 | |
448cd166 DT |
1225 | return 0; |
1226 | } | |
1227 | } | |
f2278f31 | 1228 | |
f9ce6eb5 | 1229 | if (_IOC_DIR(cmd) == _IOC_WRITE) { |
f2278f31 | 1230 | |
448cd166 | 1231 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { |
1da177e4 | 1232 | |
0a74a1df DM |
1233 | if (!dev->absinfo) |
1234 | return -EINVAL; | |
1235 | ||
448cd166 | 1236 | t = _IOC_NR(cmd) & ABS_MAX; |
41e979f8 | 1237 | |
448cd166 DT |
1238 | if (copy_from_user(&abs, p, min_t(size_t, |
1239 | size, sizeof(struct input_absinfo)))) | |
1240 | return -EFAULT; | |
1da177e4 | 1241 | |
448cd166 DT |
1242 | if (size < sizeof(struct input_absinfo)) |
1243 | abs.resolution = 0; | |
d31b2865 | 1244 | |
448cd166 DT |
1245 | /* We can't change number of reserved MT slots */ |
1246 | if (t == ABS_MT_SLOT) | |
1247 | return -EINVAL; | |
40d007e7 | 1248 | |
448cd166 DT |
1249 | /* |
1250 | * Take event lock to ensure that we are not | |
1251 | * changing device parameters in the middle | |
1252 | * of event. | |
1253 | */ | |
1254 | spin_lock_irq(&dev->event_lock); | |
1255 | dev->absinfo[t] = abs; | |
1256 | spin_unlock_irq(&dev->event_lock); | |
6addb1d6 | 1257 | |
448cd166 | 1258 | return 0; |
6addb1d6 | 1259 | } |
1da177e4 | 1260 | } |
448cd166 | 1261 | |
1da177e4 LT |
1262 | return -EINVAL; |
1263 | } | |
1da177e4 | 1264 | |
6addb1d6 DT |
1265 | static long evdev_ioctl_handler(struct file *file, unsigned int cmd, |
1266 | void __user *p, int compat_mode) | |
1267 | { | |
1268 | struct evdev_client *client = file->private_data; | |
1269 | struct evdev *evdev = client->evdev; | |
1270 | int retval; | |
1271 | ||
1272 | retval = mutex_lock_interruptible(&evdev->mutex); | |
1273 | if (retval) | |
1274 | return retval; | |
1275 | ||
c7dc6573 | 1276 | if (!evdev->exist || client->revoked) { |
6addb1d6 DT |
1277 | retval = -ENODEV; |
1278 | goto out; | |
1279 | } | |
1280 | ||
1281 | retval = evdev_do_ioctl(file, cmd, p, compat_mode); | |
1282 | ||
1283 | out: | |
1284 | mutex_unlock(&evdev->mutex); | |
1285 | return retval; | |
1286 | } | |
1287 | ||
3a51f7c4 DT |
1288 | static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1289 | { | |
1290 | return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0); | |
1291 | } | |
41e979f8 | 1292 | |
3a51f7c4 | 1293 | #ifdef CONFIG_COMPAT |
6addb1d6 DT |
1294 | static long evdev_ioctl_compat(struct file *file, |
1295 | unsigned int cmd, unsigned long arg) | |
52658bb6 | 1296 | { |
3a51f7c4 | 1297 | return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1); |
1da177e4 | 1298 | } |
52658bb6 | 1299 | #endif |
1da177e4 | 1300 | |
66e66118 | 1301 | static const struct file_operations evdev_fops = { |
6addb1d6 DT |
1302 | .owner = THIS_MODULE, |
1303 | .read = evdev_read, | |
1304 | .write = evdev_write, | |
1305 | .poll = evdev_poll, | |
1306 | .open = evdev_open, | |
1307 | .release = evdev_release, | |
1308 | .unlocked_ioctl = evdev_ioctl, | |
52658bb6 | 1309 | #ifdef CONFIG_COMPAT |
6addb1d6 | 1310 | .compat_ioctl = evdev_ioctl_compat, |
52658bb6 | 1311 | #endif |
6addb1d6 | 1312 | .fasync = evdev_fasync, |
6038f373 AB |
1313 | .flush = evdev_flush, |
1314 | .llseek = no_llseek, | |
1da177e4 LT |
1315 | }; |
1316 | ||
6addb1d6 DT |
1317 | /* |
1318 | * Mark device non-existent. This disables writes, ioctls and | |
1319 | * prevents new users from opening the device. Already posted | |
1320 | * blocking reads will stay, however new ones will fail. | |
1321 | */ | |
1322 | static void evdev_mark_dead(struct evdev *evdev) | |
1323 | { | |
1324 | mutex_lock(&evdev->mutex); | |
20da92de | 1325 | evdev->exist = false; |
6addb1d6 DT |
1326 | mutex_unlock(&evdev->mutex); |
1327 | } | |
1328 | ||
1329 | static void evdev_cleanup(struct evdev *evdev) | |
1330 | { | |
1331 | struct input_handle *handle = &evdev->handle; | |
1332 | ||
1333 | evdev_mark_dead(evdev); | |
1334 | evdev_hangup(evdev); | |
7f8d4cad | 1335 | |
6addb1d6 DT |
1336 | /* evdev is marked dead so no one else accesses evdev->open */ |
1337 | if (evdev->open) { | |
1338 | input_flush_device(handle, NULL); | |
1339 | input_close_device(handle); | |
1340 | } | |
1341 | } | |
1342 | ||
1343 | /* | |
1344 | * Create new evdev device. Note that input core serializes calls | |
7f8d4cad | 1345 | * to connect and disconnect. |
6addb1d6 | 1346 | */ |
5b2a0826 DT |
1347 | static int evdev_connect(struct input_handler *handler, struct input_dev *dev, |
1348 | const struct input_device_id *id) | |
1da177e4 LT |
1349 | { |
1350 | struct evdev *evdev; | |
1351 | int minor; | |
7f8d4cad | 1352 | int dev_no; |
5b2a0826 | 1353 | int error; |
1da177e4 | 1354 | |
7f8d4cad DT |
1355 | minor = input_get_new_minor(EVDEV_MINOR_BASE, EVDEV_MINORS, true); |
1356 | if (minor < 0) { | |
1357 | error = minor; | |
1358 | pr_err("failed to reserve new minor: %d\n", error); | |
1359 | return error; | |
1da177e4 LT |
1360 | } |
1361 | ||
5b2a0826 | 1362 | evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL); |
7f8d4cad DT |
1363 | if (!evdev) { |
1364 | error = -ENOMEM; | |
1365 | goto err_free_minor; | |
1366 | } | |
1da177e4 | 1367 | |
d0ffb9be | 1368 | INIT_LIST_HEAD(&evdev->client_list); |
6addb1d6 DT |
1369 | spin_lock_init(&evdev->client_lock); |
1370 | mutex_init(&evdev->mutex); | |
1da177e4 | 1371 | init_waitqueue_head(&evdev->wait); |
20da92de | 1372 | evdev->exist = true; |
7f8d4cad DT |
1373 | |
1374 | dev_no = minor; | |
1375 | /* Normalize device number if it falls into legacy range */ | |
1376 | if (dev_no < EVDEV_MINOR_BASE + EVDEV_MINORS) | |
1377 | dev_no -= EVDEV_MINOR_BASE; | |
1378 | dev_set_name(&evdev->dev, "event%d", dev_no); | |
6addb1d6 | 1379 | |
a7097ff8 | 1380 | evdev->handle.dev = input_get_device(dev); |
3d5cb60e | 1381 | evdev->handle.name = dev_name(&evdev->dev); |
1da177e4 LT |
1382 | evdev->handle.handler = handler; |
1383 | evdev->handle.private = evdev; | |
1da177e4 | 1384 | |
7f8d4cad | 1385 | evdev->dev.devt = MKDEV(INPUT_MAJOR, minor); |
9657d75c DT |
1386 | evdev->dev.class = &input_class; |
1387 | evdev->dev.parent = &dev->dev; | |
9657d75c DT |
1388 | evdev->dev.release = evdev_free; |
1389 | device_initialize(&evdev->dev); | |
5b2a0826 | 1390 | |
6addb1d6 | 1391 | error = input_register_handle(&evdev->handle); |
5b2a0826 | 1392 | if (error) |
9657d75c | 1393 | goto err_free_evdev; |
5b2a0826 | 1394 | |
7f8d4cad | 1395 | cdev_init(&evdev->cdev, &evdev_fops); |
6addb1d6 | 1396 | |
358a89ca | 1397 | error = cdev_device_add(&evdev->cdev, &evdev->dev); |
5b2a0826 | 1398 | if (error) |
6addb1d6 | 1399 | goto err_cleanup_evdev; |
1da177e4 | 1400 | |
5b2a0826 | 1401 | return 0; |
1da177e4 | 1402 | |
6addb1d6 DT |
1403 | err_cleanup_evdev: |
1404 | evdev_cleanup(evdev); | |
6addb1d6 | 1405 | input_unregister_handle(&evdev->handle); |
5b2a0826 | 1406 | err_free_evdev: |
9657d75c | 1407 | put_device(&evdev->dev); |
7f8d4cad DT |
1408 | err_free_minor: |
1409 | input_free_minor(minor); | |
5b2a0826 | 1410 | return error; |
1da177e4 LT |
1411 | } |
1412 | ||
1413 | static void evdev_disconnect(struct input_handle *handle) | |
1414 | { | |
1415 | struct evdev *evdev = handle->private; | |
1da177e4 | 1416 | |
358a89ca | 1417 | cdev_device_del(&evdev->cdev, &evdev->dev); |
6addb1d6 | 1418 | evdev_cleanup(evdev); |
7f8d4cad | 1419 | input_free_minor(MINOR(evdev->dev.devt)); |
6addb1d6 | 1420 | input_unregister_handle(handle); |
9657d75c | 1421 | put_device(&evdev->dev); |
1da177e4 LT |
1422 | } |
1423 | ||
66e66118 | 1424 | static const struct input_device_id evdev_ids[] = { |
1da177e4 LT |
1425 | { .driver_info = 1 }, /* Matches all devices */ |
1426 | { }, /* Terminating zero entry */ | |
1427 | }; | |
1428 | ||
1429 | MODULE_DEVICE_TABLE(input, evdev_ids); | |
1430 | ||
1431 | static struct input_handler evdev_handler = { | |
6addb1d6 | 1432 | .event = evdev_event, |
a274ac15 | 1433 | .events = evdev_events, |
6addb1d6 DT |
1434 | .connect = evdev_connect, |
1435 | .disconnect = evdev_disconnect, | |
7f8d4cad | 1436 | .legacy_minors = true, |
6addb1d6 DT |
1437 | .minor = EVDEV_MINOR_BASE, |
1438 | .name = "evdev", | |
1439 | .id_table = evdev_ids, | |
1da177e4 LT |
1440 | }; |
1441 | ||
1442 | static int __init evdev_init(void) | |
1443 | { | |
4263cf0f | 1444 | return input_register_handler(&evdev_handler); |
1da177e4 LT |
1445 | } |
1446 | ||
1447 | static void __exit evdev_exit(void) | |
1448 | { | |
1449 | input_unregister_handler(&evdev_handler); | |
1450 | } | |
1451 | ||
1452 | module_init(evdev_init); | |
1453 | module_exit(evdev_exit); | |
1454 | ||
1455 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
1456 | MODULE_DESCRIPTION("Input driver event char devices"); | |
1457 | MODULE_LICENSE("GPL"); |