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 | ||
11 | #define EVDEV_MINOR_BASE 64 | |
12 | #define EVDEV_MINORS 32 | |
13 | #define EVDEV_BUFFER_SIZE 64 | |
14 | ||
15 | #include <linux/poll.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/input.h> | |
20 | #include <linux/major.h> | |
1da177e4 | 21 | #include <linux/device.h> |
52658bb6 | 22 | #include <linux/compat.h> |
1da177e4 LT |
23 | |
24 | struct evdev { | |
25 | int exist; | |
26 | int open; | |
27 | int minor; | |
28 | char name[16]; | |
29 | struct input_handle handle; | |
30 | wait_queue_head_t wait; | |
d0ffb9be DT |
31 | struct evdev_client *grab; |
32 | struct list_head client_list; | |
6addb1d6 DT |
33 | spinlock_t client_lock; /* protects client_list */ |
34 | struct mutex mutex; | |
9657d75c | 35 | struct device dev; |
1da177e4 LT |
36 | }; |
37 | ||
d0ffb9be | 38 | struct evdev_client { |
1da177e4 LT |
39 | struct input_event buffer[EVDEV_BUFFER_SIZE]; |
40 | int head; | |
41 | int tail; | |
6addb1d6 | 42 | spinlock_t buffer_lock; /* protects access to buffer, head and tail */ |
1da177e4 LT |
43 | struct fasync_struct *fasync; |
44 | struct evdev *evdev; | |
45 | struct list_head node; | |
46 | }; | |
47 | ||
48 | static struct evdev *evdev_table[EVDEV_MINORS]; | |
6addb1d6 | 49 | static DEFINE_MUTEX(evdev_table_mutex); |
1da177e4 | 50 | |
6addb1d6 DT |
51 | static void evdev_pass_event(struct evdev_client *client, |
52 | struct input_event *event) | |
53 | { | |
54 | /* | |
55 | * Interrupts are disabled, just acquire the lock | |
56 | */ | |
57 | spin_lock(&client->buffer_lock); | |
58 | client->buffer[client->head++] = *event; | |
59 | client->head &= EVDEV_BUFFER_SIZE - 1; | |
60 | spin_unlock(&client->buffer_lock); | |
61 | ||
62 | kill_fasync(&client->fasync, SIGIO, POLL_IN); | |
63 | } | |
64 | ||
65 | /* | |
82ba56c2 | 66 | * Pass incoming event to all connected clients. |
6addb1d6 DT |
67 | */ |
68 | static void evdev_event(struct input_handle *handle, | |
69 | unsigned int type, unsigned int code, int value) | |
1da177e4 LT |
70 | { |
71 | struct evdev *evdev = handle->private; | |
d0ffb9be | 72 | struct evdev_client *client; |
6addb1d6 | 73 | struct input_event event; |
1da177e4 | 74 | |
6addb1d6 DT |
75 | do_gettimeofday(&event.time); |
76 | event.type = type; | |
77 | event.code = code; | |
78 | event.value = value; | |
1da177e4 | 79 | |
82ba56c2 DT |
80 | rcu_read_lock(); |
81 | ||
6addb1d6 DT |
82 | client = rcu_dereference(evdev->grab); |
83 | if (client) | |
84 | evdev_pass_event(client, &event); | |
85 | else | |
86 | list_for_each_entry_rcu(client, &evdev->client_list, node) | |
87 | evdev_pass_event(client, &event); | |
1da177e4 | 88 | |
82ba56c2 DT |
89 | rcu_read_unlock(); |
90 | ||
1da177e4 LT |
91 | wake_up_interruptible(&evdev->wait); |
92 | } | |
93 | ||
94 | static int evdev_fasync(int fd, struct file *file, int on) | |
95 | { | |
d0ffb9be | 96 | struct evdev_client *client = file->private_data; |
1da177e4 | 97 | int retval; |
1e0afb28 | 98 | |
d0ffb9be | 99 | retval = fasync_helper(fd, file, on, &client->fasync); |
1e0afb28 | 100 | |
1da177e4 LT |
101 | return retval < 0 ? retval : 0; |
102 | } | |
103 | ||
1e0afb28 | 104 | static int evdev_flush(struct file *file, fl_owner_t id) |
1da177e4 | 105 | { |
d0ffb9be DT |
106 | struct evdev_client *client = file->private_data; |
107 | struct evdev *evdev = client->evdev; | |
6addb1d6 DT |
108 | int retval; |
109 | ||
110 | retval = mutex_lock_interruptible(&evdev->mutex); | |
111 | if (retval) | |
112 | return retval; | |
1e0afb28 | 113 | |
d0ffb9be | 114 | if (!evdev->exist) |
6addb1d6 DT |
115 | retval = -ENODEV; |
116 | else | |
117 | retval = input_flush_device(&evdev->handle, file); | |
1e0afb28 | 118 | |
6addb1d6 DT |
119 | mutex_unlock(&evdev->mutex); |
120 | return retval; | |
1da177e4 LT |
121 | } |
122 | ||
9657d75c | 123 | static void evdev_free(struct device *dev) |
1da177e4 | 124 | { |
9657d75c DT |
125 | struct evdev *evdev = container_of(dev, struct evdev, dev); |
126 | ||
a7097ff8 | 127 | input_put_device(evdev->handle.dev); |
1da177e4 LT |
128 | kfree(evdev); |
129 | } | |
130 | ||
6addb1d6 DT |
131 | /* |
132 | * Grabs an event device (along with underlying input device). | |
133 | * This function is called with evdev->mutex taken. | |
134 | */ | |
135 | static int evdev_grab(struct evdev *evdev, struct evdev_client *client) | |
136 | { | |
137 | int error; | |
138 | ||
139 | if (evdev->grab) | |
140 | return -EBUSY; | |
141 | ||
142 | error = input_grab_device(&evdev->handle); | |
143 | if (error) | |
144 | return error; | |
145 | ||
146 | rcu_assign_pointer(evdev->grab, client); | |
82ba56c2 | 147 | synchronize_rcu(); |
6addb1d6 DT |
148 | |
149 | return 0; | |
150 | } | |
151 | ||
152 | static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client) | |
153 | { | |
154 | if (evdev->grab != client) | |
155 | return -EINVAL; | |
156 | ||
157 | rcu_assign_pointer(evdev->grab, NULL); | |
82ba56c2 | 158 | synchronize_rcu(); |
6addb1d6 DT |
159 | input_release_device(&evdev->handle); |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
164 | static void evdev_attach_client(struct evdev *evdev, | |
165 | struct evdev_client *client) | |
166 | { | |
167 | spin_lock(&evdev->client_lock); | |
168 | list_add_tail_rcu(&client->node, &evdev->client_list); | |
169 | spin_unlock(&evdev->client_lock); | |
82ba56c2 | 170 | synchronize_rcu(); |
6addb1d6 DT |
171 | } |
172 | ||
173 | static void evdev_detach_client(struct evdev *evdev, | |
174 | struct evdev_client *client) | |
175 | { | |
176 | spin_lock(&evdev->client_lock); | |
177 | list_del_rcu(&client->node); | |
178 | spin_unlock(&evdev->client_lock); | |
82ba56c2 | 179 | synchronize_rcu(); |
6addb1d6 DT |
180 | } |
181 | ||
182 | static int evdev_open_device(struct evdev *evdev) | |
183 | { | |
184 | int retval; | |
185 | ||
186 | retval = mutex_lock_interruptible(&evdev->mutex); | |
187 | if (retval) | |
188 | return retval; | |
189 | ||
190 | if (!evdev->exist) | |
191 | retval = -ENODEV; | |
06445014 | 192 | else if (!evdev->open++) { |
6addb1d6 | 193 | retval = input_open_device(&evdev->handle); |
06445014 ON |
194 | if (retval) |
195 | evdev->open--; | |
196 | } | |
6addb1d6 DT |
197 | |
198 | mutex_unlock(&evdev->mutex); | |
199 | return retval; | |
200 | } | |
201 | ||
202 | static void evdev_close_device(struct evdev *evdev) | |
203 | { | |
204 | mutex_lock(&evdev->mutex); | |
205 | ||
206 | if (evdev->exist && !--evdev->open) | |
207 | input_close_device(&evdev->handle); | |
208 | ||
209 | mutex_unlock(&evdev->mutex); | |
210 | } | |
211 | ||
212 | /* | |
213 | * Wake up users waiting for IO so they can disconnect from | |
214 | * dead device. | |
215 | */ | |
216 | static void evdev_hangup(struct evdev *evdev) | |
217 | { | |
218 | struct evdev_client *client; | |
219 | ||
220 | spin_lock(&evdev->client_lock); | |
221 | list_for_each_entry(client, &evdev->client_list, node) | |
222 | kill_fasync(&client->fasync, SIGIO, POLL_HUP); | |
223 | spin_unlock(&evdev->client_lock); | |
224 | ||
225 | wake_up_interruptible(&evdev->wait); | |
226 | } | |
227 | ||
d0ffb9be | 228 | static int evdev_release(struct inode *inode, struct file *file) |
1da177e4 | 229 | { |
d0ffb9be DT |
230 | struct evdev_client *client = file->private_data; |
231 | struct evdev *evdev = client->evdev; | |
1da177e4 | 232 | |
6addb1d6 DT |
233 | mutex_lock(&evdev->mutex); |
234 | if (evdev->grab == client) | |
235 | evdev_ungrab(evdev, client); | |
236 | mutex_unlock(&evdev->mutex); | |
1da177e4 LT |
237 | |
238 | evdev_fasync(-1, file, 0); | |
6addb1d6 | 239 | evdev_detach_client(evdev, client); |
d0ffb9be | 240 | kfree(client); |
1da177e4 | 241 | |
6addb1d6 | 242 | evdev_close_device(evdev); |
9657d75c | 243 | put_device(&evdev->dev); |
1da177e4 | 244 | |
1da177e4 LT |
245 | return 0; |
246 | } | |
247 | ||
d0ffb9be | 248 | static int evdev_open(struct inode *inode, struct file *file) |
1da177e4 | 249 | { |
d0ffb9be | 250 | struct evdev *evdev; |
6addb1d6 | 251 | struct evdev_client *client; |
1da177e4 | 252 | int i = iminor(inode) - EVDEV_MINOR_BASE; |
d542ed82 | 253 | int error; |
1da177e4 | 254 | |
d0ffb9be | 255 | if (i >= EVDEV_MINORS) |
1da177e4 LT |
256 | return -ENODEV; |
257 | ||
6addb1d6 DT |
258 | error = mutex_lock_interruptible(&evdev_table_mutex); |
259 | if (error) | |
260 | return error; | |
d0ffb9be | 261 | evdev = evdev_table[i]; |
6addb1d6 DT |
262 | if (evdev) |
263 | get_device(&evdev->dev); | |
264 | mutex_unlock(&evdev_table_mutex); | |
d0ffb9be | 265 | |
6addb1d6 | 266 | if (!evdev) |
1da177e4 LT |
267 | return -ENODEV; |
268 | ||
d0ffb9be | 269 | client = kzalloc(sizeof(struct evdev_client), GFP_KERNEL); |
9657d75c DT |
270 | if (!client) { |
271 | error = -ENOMEM; | |
272 | goto err_put_evdev; | |
273 | } | |
1da177e4 | 274 | |
6addb1d6 | 275 | spin_lock_init(&client->buffer_lock); |
d0ffb9be | 276 | client->evdev = evdev; |
6addb1d6 | 277 | evdev_attach_client(evdev, client); |
1da177e4 | 278 | |
6addb1d6 DT |
279 | error = evdev_open_device(evdev); |
280 | if (error) | |
281 | goto err_free_client; | |
1da177e4 | 282 | |
d0ffb9be | 283 | file->private_data = client; |
1da177e4 | 284 | return 0; |
9657d75c DT |
285 | |
286 | err_free_client: | |
6addb1d6 | 287 | evdev_detach_client(evdev, client); |
9657d75c DT |
288 | kfree(client); |
289 | err_put_evdev: | |
290 | put_device(&evdev->dev); | |
291 | return error; | |
1da177e4 LT |
292 | } |
293 | ||
52658bb6 | 294 | #ifdef CONFIG_COMPAT |
3a51f7c4 | 295 | |
52658bb6 JK |
296 | struct input_event_compat { |
297 | struct compat_timeval time; | |
298 | __u16 type; | |
299 | __u16 code; | |
300 | __s32 value; | |
301 | }; | |
302 | ||
f2278f31 AD |
303 | struct ff_periodic_effect_compat { |
304 | __u16 waveform; | |
305 | __u16 period; | |
306 | __s16 magnitude; | |
307 | __s16 offset; | |
308 | __u16 phase; | |
309 | ||
310 | struct ff_envelope envelope; | |
311 | ||
312 | __u32 custom_len; | |
313 | compat_uptr_t custom_data; | |
314 | }; | |
315 | ||
316 | struct ff_effect_compat { | |
317 | __u16 type; | |
318 | __s16 id; | |
319 | __u16 direction; | |
320 | struct ff_trigger trigger; | |
321 | struct ff_replay replay; | |
322 | ||
323 | union { | |
324 | struct ff_constant_effect constant; | |
325 | struct ff_ramp_effect ramp; | |
326 | struct ff_periodic_effect_compat periodic; | |
327 | struct ff_condition_effect condition[2]; /* One for each axis */ | |
328 | struct ff_rumble_effect rumble; | |
329 | } u; | |
330 | }; | |
331 | ||
bf2fcc6f AK |
332 | /* Note to the author of this code: did it ever occur to |
333 | you why the ifdefs are needed? Think about it again. -AK */ | |
52658bb6 | 334 | #ifdef CONFIG_X86_64 |
bf2fcc6f | 335 | # define COMPAT_TEST is_compat_task() |
52658bb6 | 336 | #elif defined(CONFIG_IA64) |
6450578f | 337 | # define COMPAT_TEST IS_IA32_PROCESS(task_pt_regs(current)) |
347a8dc3 | 338 | #elif defined(CONFIG_S390) |
52658bb6 | 339 | # define COMPAT_TEST test_thread_flag(TIF_31BIT) |
59df6bbf | 340 | #elif defined(CONFIG_MIPS) |
293c5bd1 | 341 | # define COMPAT_TEST test_thread_flag(TIF_32BIT_ADDR) |
52658bb6 JK |
342 | #else |
343 | # define COMPAT_TEST test_thread_flag(TIF_32BIT) | |
344 | #endif | |
345 | ||
3a51f7c4 | 346 | static inline size_t evdev_event_size(void) |
52658bb6 | 347 | { |
3a51f7c4 DT |
348 | return COMPAT_TEST ? |
349 | sizeof(struct input_event_compat) : sizeof(struct input_event); | |
350 | } | |
52658bb6 | 351 | |
6addb1d6 DT |
352 | static int evdev_event_from_user(const char __user *buffer, |
353 | struct input_event *event) | |
3a51f7c4 DT |
354 | { |
355 | if (COMPAT_TEST) { | |
356 | struct input_event_compat compat_event; | |
357 | ||
6addb1d6 DT |
358 | if (copy_from_user(&compat_event, buffer, |
359 | sizeof(struct input_event_compat))) | |
3a51f7c4 DT |
360 | return -EFAULT; |
361 | ||
362 | event->time.tv_sec = compat_event.time.tv_sec; | |
363 | event->time.tv_usec = compat_event.time.tv_usec; | |
364 | event->type = compat_event.type; | |
365 | event->code = compat_event.code; | |
366 | event->value = compat_event.value; | |
367 | ||
368 | } else { | |
369 | if (copy_from_user(event, buffer, sizeof(struct input_event))) | |
52658bb6 | 370 | return -EFAULT; |
52658bb6 JK |
371 | } |
372 | ||
3a51f7c4 | 373 | return 0; |
52658bb6 | 374 | } |
52658bb6 | 375 | |
6addb1d6 DT |
376 | static int evdev_event_to_user(char __user *buffer, |
377 | const struct input_event *event) | |
1da177e4 | 378 | { |
3a51f7c4 DT |
379 | if (COMPAT_TEST) { |
380 | struct input_event_compat compat_event; | |
1da177e4 | 381 | |
3a51f7c4 DT |
382 | compat_event.time.tv_sec = event->time.tv_sec; |
383 | compat_event.time.tv_usec = event->time.tv_usec; | |
384 | compat_event.type = event->type; | |
385 | compat_event.code = event->code; | |
386 | compat_event.value = event->value; | |
52658bb6 | 387 | |
6addb1d6 DT |
388 | if (copy_to_user(buffer, &compat_event, |
389 | sizeof(struct input_event_compat))) | |
3a51f7c4 | 390 | return -EFAULT; |
1da177e4 | 391 | |
3a51f7c4 DT |
392 | } else { |
393 | if (copy_to_user(buffer, event, sizeof(struct input_event))) | |
1da177e4 | 394 | return -EFAULT; |
1da177e4 LT |
395 | } |
396 | ||
3a51f7c4 | 397 | return 0; |
1da177e4 LT |
398 | } |
399 | ||
f2278f31 AD |
400 | static int evdev_ff_effect_from_user(const char __user *buffer, size_t size, |
401 | struct ff_effect *effect) | |
402 | { | |
403 | if (COMPAT_TEST) { | |
404 | struct ff_effect_compat *compat_effect; | |
405 | ||
406 | if (size != sizeof(struct ff_effect_compat)) | |
407 | return -EINVAL; | |
408 | ||
409 | /* | |
410 | * It so happens that the pointer which needs to be changed | |
411 | * is the last field in the structure, so we can copy the | |
412 | * whole thing and replace just the pointer. | |
413 | */ | |
414 | ||
415 | compat_effect = (struct ff_effect_compat *)effect; | |
416 | ||
417 | if (copy_from_user(compat_effect, buffer, | |
418 | sizeof(struct ff_effect_compat))) | |
419 | return -EFAULT; | |
420 | ||
421 | if (compat_effect->type == FF_PERIODIC && | |
422 | compat_effect->u.periodic.waveform == FF_CUSTOM) | |
423 | effect->u.periodic.custom_data = | |
424 | compat_ptr(compat_effect->u.periodic.custom_data); | |
425 | } else { | |
426 | if (size != sizeof(struct ff_effect)) | |
427 | return -EINVAL; | |
428 | ||
429 | if (copy_from_user(effect, buffer, sizeof(struct ff_effect))) | |
430 | return -EFAULT; | |
431 | } | |
432 | ||
433 | return 0; | |
434 | } | |
435 | ||
3a51f7c4 DT |
436 | #else |
437 | ||
438 | static inline size_t evdev_event_size(void) | |
52658bb6 | 439 | { |
3a51f7c4 DT |
440 | return sizeof(struct input_event); |
441 | } | |
52658bb6 | 442 | |
6addb1d6 DT |
443 | static int evdev_event_from_user(const char __user *buffer, |
444 | struct input_event *event) | |
3a51f7c4 DT |
445 | { |
446 | if (copy_from_user(event, buffer, sizeof(struct input_event))) | |
447 | return -EFAULT; | |
52658bb6 | 448 | |
3a51f7c4 DT |
449 | return 0; |
450 | } | |
52658bb6 | 451 | |
6addb1d6 DT |
452 | static int evdev_event_to_user(char __user *buffer, |
453 | const struct input_event *event) | |
3a51f7c4 DT |
454 | { |
455 | if (copy_to_user(buffer, event, sizeof(struct input_event))) | |
456 | return -EFAULT; | |
52658bb6 | 457 | |
3a51f7c4 DT |
458 | return 0; |
459 | } | |
460 | ||
f2278f31 AD |
461 | static int evdev_ff_effect_from_user(const char __user *buffer, size_t size, |
462 | struct ff_effect *effect) | |
463 | { | |
464 | if (size != sizeof(struct ff_effect)) | |
465 | return -EINVAL; | |
466 | ||
467 | if (copy_from_user(effect, buffer, sizeof(struct ff_effect))) | |
468 | return -EFAULT; | |
469 | ||
470 | return 0; | |
471 | } | |
472 | ||
3a51f7c4 DT |
473 | #endif /* CONFIG_COMPAT */ |
474 | ||
6addb1d6 DT |
475 | static ssize_t evdev_write(struct file *file, const char __user *buffer, |
476 | size_t count, loff_t *ppos) | |
3a51f7c4 | 477 | { |
d0ffb9be DT |
478 | struct evdev_client *client = file->private_data; |
479 | struct evdev *evdev = client->evdev; | |
3a51f7c4 | 480 | struct input_event event; |
6addb1d6 | 481 | int retval; |
52658bb6 | 482 | |
6addb1d6 DT |
483 | retval = mutex_lock_interruptible(&evdev->mutex); |
484 | if (retval) | |
485 | return retval; | |
486 | ||
487 | if (!evdev->exist) { | |
488 | retval = -ENODEV; | |
489 | goto out; | |
490 | } | |
52658bb6 | 491 | |
3a51f7c4 DT |
492 | while (retval < count) { |
493 | ||
6addb1d6 DT |
494 | if (evdev_event_from_user(buffer + retval, &event)) { |
495 | retval = -EFAULT; | |
496 | goto out; | |
497 | } | |
498 | ||
499 | input_inject_event(&evdev->handle, | |
500 | event.type, event.code, event.value); | |
3a51f7c4 | 501 | retval += evdev_event_size(); |
52658bb6 JK |
502 | } |
503 | ||
6addb1d6 DT |
504 | out: |
505 | mutex_unlock(&evdev->mutex); | |
52658bb6 JK |
506 | return retval; |
507 | } | |
52658bb6 | 508 | |
6addb1d6 DT |
509 | static int evdev_fetch_next_event(struct evdev_client *client, |
510 | struct input_event *event) | |
511 | { | |
512 | int have_event; | |
513 | ||
514 | spin_lock_irq(&client->buffer_lock); | |
515 | ||
516 | have_event = client->head != client->tail; | |
517 | if (have_event) { | |
518 | *event = client->buffer[client->tail++]; | |
519 | client->tail &= EVDEV_BUFFER_SIZE - 1; | |
520 | } | |
521 | ||
522 | spin_unlock_irq(&client->buffer_lock); | |
523 | ||
524 | return have_event; | |
525 | } | |
526 | ||
527 | static ssize_t evdev_read(struct file *file, char __user *buffer, | |
528 | size_t count, loff_t *ppos) | |
1da177e4 | 529 | { |
d0ffb9be DT |
530 | struct evdev_client *client = file->private_data; |
531 | struct evdev *evdev = client->evdev; | |
6addb1d6 | 532 | struct input_event event; |
1da177e4 LT |
533 | int retval; |
534 | ||
3a51f7c4 | 535 | if (count < evdev_event_size()) |
1da177e4 LT |
536 | return -EINVAL; |
537 | ||
6addb1d6 DT |
538 | if (client->head == client->tail && evdev->exist && |
539 | (file->f_flags & O_NONBLOCK)) | |
1da177e4 LT |
540 | return -EAGAIN; |
541 | ||
d0ffb9be DT |
542 | retval = wait_event_interruptible(evdev->wait, |
543 | client->head != client->tail || !evdev->exist); | |
1da177e4 LT |
544 | if (retval) |
545 | return retval; | |
546 | ||
d0ffb9be | 547 | if (!evdev->exist) |
1da177e4 LT |
548 | return -ENODEV; |
549 | ||
6addb1d6 DT |
550 | while (retval + evdev_event_size() <= count && |
551 | evdev_fetch_next_event(client, &event)) { | |
3a51f7c4 | 552 | |
6addb1d6 | 553 | if (evdev_event_to_user(buffer + retval, &event)) |
3a51f7c4 DT |
554 | return -EFAULT; |
555 | ||
3a51f7c4 | 556 | retval += evdev_event_size(); |
1da177e4 LT |
557 | } |
558 | ||
559 | return retval; | |
560 | } | |
561 | ||
562 | /* No kernel lock - fine */ | |
563 | static unsigned int evdev_poll(struct file *file, poll_table *wait) | |
564 | { | |
d0ffb9be DT |
565 | struct evdev_client *client = file->private_data; |
566 | struct evdev *evdev = client->evdev; | |
1e0afb28 | 567 | |
d0ffb9be DT |
568 | poll_wait(file, &evdev->wait, wait); |
569 | return ((client->head == client->tail) ? 0 : (POLLIN | POLLRDNORM)) | | |
570 | (evdev->exist ? 0 : (POLLHUP | POLLERR)); | |
1da177e4 LT |
571 | } |
572 | ||
3a51f7c4 DT |
573 | #ifdef CONFIG_COMPAT |
574 | ||
575 | #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) | |
7b19ada2 | 576 | #define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1) |
3a51f7c4 DT |
577 | |
578 | #ifdef __BIG_ENDIAN | |
579 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
580 | unsigned int maxlen, void __user *p, int compat) | |
581 | { | |
582 | int len, i; | |
583 | ||
584 | if (compat) { | |
7b19ada2 | 585 | len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t); |
bf61f8d3 | 586 | if (len > maxlen) |
3a51f7c4 DT |
587 | len = maxlen; |
588 | ||
589 | for (i = 0; i < len / sizeof(compat_long_t); i++) | |
590 | if (copy_to_user((compat_long_t __user *) p + i, | |
591 | (compat_long_t *) bits + | |
592 | i + 1 - ((i % 2) << 1), | |
593 | sizeof(compat_long_t))) | |
594 | return -EFAULT; | |
595 | } else { | |
7b19ada2 | 596 | len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
597 | if (len > maxlen) |
598 | len = maxlen; | |
599 | ||
600 | if (copy_to_user(p, bits, len)) | |
601 | return -EFAULT; | |
602 | } | |
603 | ||
604 | return len; | |
605 | } | |
606 | #else | |
607 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
608 | unsigned int maxlen, void __user *p, int compat) | |
609 | { | |
610 | int len = compat ? | |
7b19ada2 JS |
611 | BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) : |
612 | BITS_TO_LONGS(maxbit) * sizeof(long); | |
3a51f7c4 DT |
613 | |
614 | if (len > maxlen) | |
615 | len = maxlen; | |
616 | ||
617 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
618 | } | |
619 | #endif /* __BIG_ENDIAN */ | |
620 | ||
621 | #else | |
622 | ||
623 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
624 | unsigned int maxlen, void __user *p, int compat) | |
625 | { | |
7b19ada2 | 626 | int len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
627 | |
628 | if (len > maxlen) | |
629 | len = maxlen; | |
630 | ||
631 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
632 | } | |
633 | ||
634 | #endif /* CONFIG_COMPAT */ | |
635 | ||
636 | static int str_to_user(const char *str, unsigned int maxlen, void __user *p) | |
637 | { | |
638 | int len; | |
639 | ||
640 | if (!str) | |
641 | return -ENOENT; | |
642 | ||
643 | len = strlen(str) + 1; | |
644 | if (len > maxlen) | |
645 | len = maxlen; | |
646 | ||
647 | return copy_to_user(p, str, len) ? -EFAULT : len; | |
648 | } | |
649 | ||
6addb1d6 DT |
650 | static long evdev_do_ioctl(struct file *file, unsigned int cmd, |
651 | void __user *p, int compat_mode) | |
1da177e4 | 652 | { |
d0ffb9be DT |
653 | struct evdev_client *client = file->private_data; |
654 | struct evdev *evdev = client->evdev; | |
1da177e4 LT |
655 | struct input_dev *dev = evdev->handle.dev; |
656 | struct input_absinfo abs; | |
509ca1a9 | 657 | struct ff_effect effect; |
3a51f7c4 | 658 | int __user *ip = (int __user *)p; |
1da177e4 | 659 | int i, t, u, v; |
509ca1a9 | 660 | int error; |
1da177e4 | 661 | |
1da177e4 LT |
662 | switch (cmd) { |
663 | ||
6addb1d6 DT |
664 | case EVIOCGVERSION: |
665 | return put_user(EV_VERSION, ip); | |
1da177e4 | 666 | |
6addb1d6 DT |
667 | case EVIOCGID: |
668 | if (copy_to_user(p, &dev->id, sizeof(struct input_id))) | |
669 | return -EFAULT; | |
670 | return 0; | |
08791e5c | 671 | |
6addb1d6 DT |
672 | case EVIOCGREP: |
673 | if (!test_bit(EV_REP, dev->evbit)) | |
674 | return -ENOSYS; | |
675 | if (put_user(dev->rep[REP_DELAY], ip)) | |
676 | return -EFAULT; | |
677 | if (put_user(dev->rep[REP_PERIOD], ip + 1)) | |
678 | return -EFAULT; | |
679 | return 0; | |
08791e5c | 680 | |
6addb1d6 DT |
681 | case EVIOCSREP: |
682 | if (!test_bit(EV_REP, dev->evbit)) | |
683 | return -ENOSYS; | |
684 | if (get_user(u, ip)) | |
685 | return -EFAULT; | |
686 | if (get_user(v, ip + 1)) | |
687 | return -EFAULT; | |
08791e5c | 688 | |
6addb1d6 DT |
689 | input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u); |
690 | input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v); | |
3a51f7c4 | 691 | |
6addb1d6 | 692 | return 0; |
1da177e4 | 693 | |
6addb1d6 DT |
694 | case EVIOCGKEYCODE: |
695 | if (get_user(t, ip)) | |
696 | return -EFAULT; | |
c8e4c772 | 697 | |
f4f37c8e | 698 | error = input_get_keycode(dev, t, &v); |
6addb1d6 DT |
699 | if (error) |
700 | return error; | |
c8e4c772 | 701 | |
6addb1d6 DT |
702 | if (put_user(v, ip + 1)) |
703 | return -EFAULT; | |
c8e4c772 | 704 | |
6addb1d6 | 705 | return 0; |
1da177e4 | 706 | |
6addb1d6 DT |
707 | case EVIOCSKEYCODE: |
708 | if (get_user(t, ip) || get_user(v, ip + 1)) | |
709 | return -EFAULT; | |
3a51f7c4 | 710 | |
f4f37c8e | 711 | return input_set_keycode(dev, t, v); |
1da177e4 | 712 | |
6addb1d6 DT |
713 | case EVIOCRMFF: |
714 | return input_ff_erase(dev, (int)(unsigned long) p, file); | |
1da177e4 | 715 | |
6addb1d6 DT |
716 | case EVIOCGEFFECTS: |
717 | i = test_bit(EV_FF, dev->evbit) ? | |
718 | dev->ff->max_effects : 0; | |
719 | if (put_user(i, ip)) | |
720 | return -EFAULT; | |
721 | return 0; | |
722 | ||
723 | case EVIOCGRAB: | |
724 | if (p) | |
725 | return evdev_grab(evdev, client); | |
726 | else | |
727 | return evdev_ungrab(evdev, client); | |
1da177e4 | 728 | |
6addb1d6 | 729 | default: |
1da177e4 | 730 | |
6addb1d6 DT |
731 | if (_IOC_TYPE(cmd) != 'E') |
732 | return -EINVAL; | |
1da177e4 | 733 | |
6addb1d6 | 734 | if (_IOC_DIR(cmd) == _IOC_READ) { |
41e979f8 | 735 | |
6addb1d6 | 736 | if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0))) { |
41e979f8 | 737 | |
6addb1d6 DT |
738 | unsigned long *bits; |
739 | int len; | |
41e979f8 | 740 | |
6addb1d6 | 741 | switch (_IOC_NR(cmd) & EV_MAX) { |
1da177e4 | 742 | |
6addb1d6 DT |
743 | case 0: bits = dev->evbit; len = EV_MAX; break; |
744 | case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; | |
745 | case EV_REL: bits = dev->relbit; len = REL_MAX; break; | |
746 | case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; | |
747 | case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; | |
748 | case EV_LED: bits = dev->ledbit; len = LED_MAX; break; | |
749 | case EV_SND: bits = dev->sndbit; len = SND_MAX; break; | |
750 | case EV_FF: bits = dev->ffbit; len = FF_MAX; break; | |
751 | case EV_SW: bits = dev->swbit; len = SW_MAX; break; | |
752 | default: return -EINVAL; | |
f4f37c8e | 753 | } |
6addb1d6 DT |
754 | return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode); |
755 | } | |
1da177e4 | 756 | |
6addb1d6 DT |
757 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) |
758 | return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd), | |
759 | p, compat_mode); | |
1da177e4 | 760 | |
6addb1d6 DT |
761 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) |
762 | return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd), | |
763 | p, compat_mode); | |
1da177e4 | 764 | |
6addb1d6 DT |
765 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) |
766 | return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd), | |
767 | p, compat_mode); | |
31581066 | 768 | |
6addb1d6 DT |
769 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0))) |
770 | return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd), | |
771 | p, compat_mode); | |
1da177e4 | 772 | |
6addb1d6 DT |
773 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) |
774 | return str_to_user(dev->name, _IOC_SIZE(cmd), p); | |
1da177e4 | 775 | |
6addb1d6 DT |
776 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) |
777 | return str_to_user(dev->phys, _IOC_SIZE(cmd), p); | |
1da177e4 | 778 | |
6addb1d6 DT |
779 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) |
780 | return str_to_user(dev->uniq, _IOC_SIZE(cmd), p); | |
1da177e4 | 781 | |
6addb1d6 | 782 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { |
1da177e4 | 783 | |
6addb1d6 | 784 | t = _IOC_NR(cmd) & ABS_MAX; |
1da177e4 | 785 | |
6addb1d6 DT |
786 | abs.value = dev->abs[t]; |
787 | abs.minimum = dev->absmin[t]; | |
788 | abs.maximum = dev->absmax[t]; | |
789 | abs.fuzz = dev->absfuzz[t]; | |
790 | abs.flat = dev->absflat[t]; | |
41e979f8 | 791 | |
6addb1d6 DT |
792 | if (copy_to_user(p, &abs, sizeof(struct input_absinfo))) |
793 | return -EFAULT; | |
1da177e4 | 794 | |
6addb1d6 | 795 | return 0; |
1da177e4 LT |
796 | } |
797 | ||
6addb1d6 DT |
798 | } |
799 | ||
800 | if (_IOC_DIR(cmd) == _IOC_WRITE) { | |
1da177e4 | 801 | |
f2278f31 AD |
802 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCSFF)) { |
803 | ||
804 | if (evdev_ff_effect_from_user(p, _IOC_SIZE(cmd), &effect)) | |
805 | return -EFAULT; | |
806 | ||
807 | error = input_ff_upload(dev, &effect, file); | |
808 | ||
809 | if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) | |
810 | return -EFAULT; | |
811 | ||
812 | return error; | |
813 | } | |
814 | ||
6addb1d6 | 815 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { |
1da177e4 | 816 | |
6addb1d6 | 817 | t = _IOC_NR(cmd) & ABS_MAX; |
41e979f8 | 818 | |
6addb1d6 DT |
819 | if (copy_from_user(&abs, p, |
820 | sizeof(struct input_absinfo))) | |
821 | return -EFAULT; | |
1da177e4 | 822 | |
6addb1d6 DT |
823 | /* |
824 | * Take event lock to ensure that we are not | |
825 | * changing device parameters in the middle | |
826 | * of event. | |
827 | */ | |
828 | spin_lock_irq(&dev->event_lock); | |
1da177e4 | 829 | |
6addb1d6 DT |
830 | dev->abs[t] = abs.value; |
831 | dev->absmin[t] = abs.minimum; | |
832 | dev->absmax[t] = abs.maximum; | |
833 | dev->absfuzz[t] = abs.fuzz; | |
834 | dev->absflat[t] = abs.flat; | |
835 | ||
836 | spin_unlock_irq(&dev->event_lock); | |
837 | ||
838 | return 0; | |
1da177e4 | 839 | } |
6addb1d6 | 840 | } |
1da177e4 LT |
841 | } |
842 | return -EINVAL; | |
843 | } | |
1da177e4 | 844 | |
6addb1d6 DT |
845 | static long evdev_ioctl_handler(struct file *file, unsigned int cmd, |
846 | void __user *p, int compat_mode) | |
847 | { | |
848 | struct evdev_client *client = file->private_data; | |
849 | struct evdev *evdev = client->evdev; | |
850 | int retval; | |
851 | ||
852 | retval = mutex_lock_interruptible(&evdev->mutex); | |
853 | if (retval) | |
854 | return retval; | |
855 | ||
856 | if (!evdev->exist) { | |
857 | retval = -ENODEV; | |
858 | goto out; | |
859 | } | |
860 | ||
861 | retval = evdev_do_ioctl(file, cmd, p, compat_mode); | |
862 | ||
863 | out: | |
864 | mutex_unlock(&evdev->mutex); | |
865 | return retval; | |
866 | } | |
867 | ||
3a51f7c4 DT |
868 | static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
869 | { | |
870 | return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0); | |
871 | } | |
41e979f8 | 872 | |
3a51f7c4 | 873 | #ifdef CONFIG_COMPAT |
6addb1d6 DT |
874 | static long evdev_ioctl_compat(struct file *file, |
875 | unsigned int cmd, unsigned long arg) | |
52658bb6 | 876 | { |
3a51f7c4 | 877 | return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1); |
1da177e4 | 878 | } |
52658bb6 | 879 | #endif |
1da177e4 | 880 | |
66e66118 | 881 | static const struct file_operations evdev_fops = { |
6addb1d6 DT |
882 | .owner = THIS_MODULE, |
883 | .read = evdev_read, | |
884 | .write = evdev_write, | |
885 | .poll = evdev_poll, | |
886 | .open = evdev_open, | |
887 | .release = evdev_release, | |
888 | .unlocked_ioctl = evdev_ioctl, | |
52658bb6 | 889 | #ifdef CONFIG_COMPAT |
6addb1d6 | 890 | .compat_ioctl = evdev_ioctl_compat, |
52658bb6 | 891 | #endif |
6addb1d6 DT |
892 | .fasync = evdev_fasync, |
893 | .flush = evdev_flush | |
1da177e4 LT |
894 | }; |
895 | ||
6addb1d6 DT |
896 | static int evdev_install_chrdev(struct evdev *evdev) |
897 | { | |
898 | /* | |
899 | * No need to do any locking here as calls to connect and | |
900 | * disconnect are serialized by the input core | |
901 | */ | |
902 | evdev_table[evdev->minor] = evdev; | |
903 | return 0; | |
904 | } | |
905 | ||
906 | static void evdev_remove_chrdev(struct evdev *evdev) | |
907 | { | |
908 | /* | |
909 | * Lock evdev table to prevent race with evdev_open() | |
910 | */ | |
911 | mutex_lock(&evdev_table_mutex); | |
912 | evdev_table[evdev->minor] = NULL; | |
913 | mutex_unlock(&evdev_table_mutex); | |
914 | } | |
915 | ||
916 | /* | |
917 | * Mark device non-existent. This disables writes, ioctls and | |
918 | * prevents new users from opening the device. Already posted | |
919 | * blocking reads will stay, however new ones will fail. | |
920 | */ | |
921 | static void evdev_mark_dead(struct evdev *evdev) | |
922 | { | |
923 | mutex_lock(&evdev->mutex); | |
924 | evdev->exist = 0; | |
925 | mutex_unlock(&evdev->mutex); | |
926 | } | |
927 | ||
928 | static void evdev_cleanup(struct evdev *evdev) | |
929 | { | |
930 | struct input_handle *handle = &evdev->handle; | |
931 | ||
932 | evdev_mark_dead(evdev); | |
933 | evdev_hangup(evdev); | |
934 | evdev_remove_chrdev(evdev); | |
935 | ||
936 | /* evdev is marked dead so no one else accesses evdev->open */ | |
937 | if (evdev->open) { | |
938 | input_flush_device(handle, NULL); | |
939 | input_close_device(handle); | |
940 | } | |
941 | } | |
942 | ||
943 | /* | |
944 | * Create new evdev device. Note that input core serializes calls | |
945 | * to connect and disconnect so we don't need to lock evdev_table here. | |
946 | */ | |
5b2a0826 DT |
947 | static int evdev_connect(struct input_handler *handler, struct input_dev *dev, |
948 | const struct input_device_id *id) | |
1da177e4 LT |
949 | { |
950 | struct evdev *evdev; | |
951 | int minor; | |
5b2a0826 | 952 | int error; |
1da177e4 | 953 | |
6addb1d6 DT |
954 | for (minor = 0; minor < EVDEV_MINORS; minor++) |
955 | if (!evdev_table[minor]) | |
956 | break; | |
957 | ||
1da177e4 LT |
958 | if (minor == EVDEV_MINORS) { |
959 | printk(KERN_ERR "evdev: no more free evdev devices\n"); | |
5b2a0826 | 960 | return -ENFILE; |
1da177e4 LT |
961 | } |
962 | ||
5b2a0826 DT |
963 | evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL); |
964 | if (!evdev) | |
965 | return -ENOMEM; | |
1da177e4 | 966 | |
d0ffb9be | 967 | INIT_LIST_HEAD(&evdev->client_list); |
6addb1d6 DT |
968 | spin_lock_init(&evdev->client_lock); |
969 | mutex_init(&evdev->mutex); | |
1da177e4 LT |
970 | init_waitqueue_head(&evdev->wait); |
971 | ||
6addb1d6 | 972 | snprintf(evdev->name, sizeof(evdev->name), "event%d", minor); |
1da177e4 LT |
973 | evdev->exist = 1; |
974 | evdev->minor = minor; | |
6addb1d6 | 975 | |
a7097ff8 | 976 | evdev->handle.dev = input_get_device(dev); |
1da177e4 LT |
977 | evdev->handle.name = evdev->name; |
978 | evdev->handle.handler = handler; | |
979 | evdev->handle.private = evdev; | |
1da177e4 | 980 | |
6addb1d6 DT |
981 | strlcpy(evdev->dev.bus_id, evdev->name, sizeof(evdev->dev.bus_id)); |
982 | evdev->dev.devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor); | |
9657d75c DT |
983 | evdev->dev.class = &input_class; |
984 | evdev->dev.parent = &dev->dev; | |
9657d75c DT |
985 | evdev->dev.release = evdev_free; |
986 | device_initialize(&evdev->dev); | |
5b2a0826 | 987 | |
6addb1d6 | 988 | error = input_register_handle(&evdev->handle); |
5b2a0826 | 989 | if (error) |
9657d75c | 990 | goto err_free_evdev; |
5b2a0826 | 991 | |
6addb1d6 DT |
992 | error = evdev_install_chrdev(evdev); |
993 | if (error) | |
994 | goto err_unregister_handle; | |
995 | ||
996 | error = device_add(&evdev->dev); | |
5b2a0826 | 997 | if (error) |
6addb1d6 | 998 | goto err_cleanup_evdev; |
1da177e4 | 999 | |
5b2a0826 | 1000 | return 0; |
1da177e4 | 1001 | |
6addb1d6 DT |
1002 | err_cleanup_evdev: |
1003 | evdev_cleanup(evdev); | |
1004 | err_unregister_handle: | |
1005 | input_unregister_handle(&evdev->handle); | |
5b2a0826 | 1006 | err_free_evdev: |
9657d75c | 1007 | put_device(&evdev->dev); |
5b2a0826 | 1008 | return error; |
1da177e4 LT |
1009 | } |
1010 | ||
1011 | static void evdev_disconnect(struct input_handle *handle) | |
1012 | { | |
1013 | struct evdev *evdev = handle->private; | |
1da177e4 | 1014 | |
9657d75c | 1015 | device_del(&evdev->dev); |
6addb1d6 DT |
1016 | evdev_cleanup(evdev); |
1017 | input_unregister_handle(handle); | |
9657d75c | 1018 | put_device(&evdev->dev); |
1da177e4 LT |
1019 | } |
1020 | ||
66e66118 | 1021 | static const struct input_device_id evdev_ids[] = { |
1da177e4 LT |
1022 | { .driver_info = 1 }, /* Matches all devices */ |
1023 | { }, /* Terminating zero entry */ | |
1024 | }; | |
1025 | ||
1026 | MODULE_DEVICE_TABLE(input, evdev_ids); | |
1027 | ||
1028 | static struct input_handler evdev_handler = { | |
6addb1d6 DT |
1029 | .event = evdev_event, |
1030 | .connect = evdev_connect, | |
1031 | .disconnect = evdev_disconnect, | |
1032 | .fops = &evdev_fops, | |
1033 | .minor = EVDEV_MINOR_BASE, | |
1034 | .name = "evdev", | |
1035 | .id_table = evdev_ids, | |
1da177e4 LT |
1036 | }; |
1037 | ||
1038 | static int __init evdev_init(void) | |
1039 | { | |
4263cf0f | 1040 | return input_register_handler(&evdev_handler); |
1da177e4 LT |
1041 | } |
1042 | ||
1043 | static void __exit evdev_exit(void) | |
1044 | { | |
1045 | input_unregister_handler(&evdev_handler); | |
1046 | } | |
1047 | ||
1048 | module_init(evdev_init); | |
1049 | module_exit(evdev_exit); | |
1050 | ||
1051 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
1052 | MODULE_DESCRIPTION("Input driver event char devices"); | |
1053 | MODULE_LICENSE("GPL"); |