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> | |
a99bbaf5 | 16 | #include <linux/sched.h> |
1da177e4 LT |
17 | #include <linux/slab.h> |
18 | #include <linux/module.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/input.h> | |
21 | #include <linux/major.h> | |
1da177e4 | 22 | #include <linux/device.h> |
2d56f3a3 | 23 | #include "input-compat.h" |
1da177e4 LT |
24 | |
25 | struct evdev { | |
26 | int exist; | |
27 | int open; | |
28 | int minor; | |
1da177e4 LT |
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 | ||
30a589fd AJ |
62 | if (event->type == EV_SYN) |
63 | kill_fasync(&client->fasync, SIGIO, POLL_IN); | |
6addb1d6 DT |
64 | } |
65 | ||
66 | /* | |
82ba56c2 | 67 | * Pass incoming event to all connected clients. |
6addb1d6 DT |
68 | */ |
69 | static void evdev_event(struct input_handle *handle, | |
70 | unsigned int type, unsigned int code, int value) | |
1da177e4 LT |
71 | { |
72 | struct evdev *evdev = handle->private; | |
d0ffb9be | 73 | struct evdev_client *client; |
6addb1d6 | 74 | struct input_event event; |
1da177e4 | 75 | |
6addb1d6 DT |
76 | do_gettimeofday(&event.time); |
77 | event.type = type; | |
78 | event.code = code; | |
79 | event.value = value; | |
1da177e4 | 80 | |
82ba56c2 DT |
81 | rcu_read_lock(); |
82 | ||
6addb1d6 DT |
83 | client = rcu_dereference(evdev->grab); |
84 | if (client) | |
85 | evdev_pass_event(client, &event); | |
86 | else | |
87 | list_for_each_entry_rcu(client, &evdev->client_list, node) | |
88 | evdev_pass_event(client, &event); | |
1da177e4 | 89 | |
82ba56c2 DT |
90 | rcu_read_unlock(); |
91 | ||
1da177e4 LT |
92 | wake_up_interruptible(&evdev->wait); |
93 | } | |
94 | ||
95 | static int evdev_fasync(int fd, struct file *file, int on) | |
96 | { | |
d0ffb9be | 97 | struct evdev_client *client = file->private_data; |
1e0afb28 | 98 | |
60aa4924 | 99 | return fasync_helper(fd, file, on, &client->fasync); |
1da177e4 LT |
100 | } |
101 | ||
1e0afb28 | 102 | static int evdev_flush(struct file *file, fl_owner_t id) |
1da177e4 | 103 | { |
d0ffb9be DT |
104 | struct evdev_client *client = file->private_data; |
105 | struct evdev *evdev = client->evdev; | |
6addb1d6 DT |
106 | int retval; |
107 | ||
108 | retval = mutex_lock_interruptible(&evdev->mutex); | |
109 | if (retval) | |
110 | return retval; | |
1e0afb28 | 111 | |
d0ffb9be | 112 | if (!evdev->exist) |
6addb1d6 DT |
113 | retval = -ENODEV; |
114 | else | |
115 | retval = input_flush_device(&evdev->handle, file); | |
1e0afb28 | 116 | |
6addb1d6 DT |
117 | mutex_unlock(&evdev->mutex); |
118 | return retval; | |
1da177e4 LT |
119 | } |
120 | ||
9657d75c | 121 | static void evdev_free(struct device *dev) |
1da177e4 | 122 | { |
9657d75c DT |
123 | struct evdev *evdev = container_of(dev, struct evdev, dev); |
124 | ||
a7097ff8 | 125 | input_put_device(evdev->handle.dev); |
1da177e4 LT |
126 | kfree(evdev); |
127 | } | |
128 | ||
6addb1d6 DT |
129 | /* |
130 | * Grabs an event device (along with underlying input device). | |
131 | * This function is called with evdev->mutex taken. | |
132 | */ | |
133 | static int evdev_grab(struct evdev *evdev, struct evdev_client *client) | |
134 | { | |
135 | int error; | |
136 | ||
137 | if (evdev->grab) | |
138 | return -EBUSY; | |
139 | ||
140 | error = input_grab_device(&evdev->handle); | |
141 | if (error) | |
142 | return error; | |
143 | ||
144 | rcu_assign_pointer(evdev->grab, client); | |
82ba56c2 | 145 | synchronize_rcu(); |
6addb1d6 DT |
146 | |
147 | return 0; | |
148 | } | |
149 | ||
150 | static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client) | |
151 | { | |
152 | if (evdev->grab != client) | |
153 | return -EINVAL; | |
154 | ||
155 | rcu_assign_pointer(evdev->grab, NULL); | |
82ba56c2 | 156 | synchronize_rcu(); |
6addb1d6 DT |
157 | input_release_device(&evdev->handle); |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
162 | static void evdev_attach_client(struct evdev *evdev, | |
163 | struct evdev_client *client) | |
164 | { | |
165 | spin_lock(&evdev->client_lock); | |
166 | list_add_tail_rcu(&client->node, &evdev->client_list); | |
167 | spin_unlock(&evdev->client_lock); | |
82ba56c2 | 168 | synchronize_rcu(); |
6addb1d6 DT |
169 | } |
170 | ||
171 | static void evdev_detach_client(struct evdev *evdev, | |
172 | struct evdev_client *client) | |
173 | { | |
174 | spin_lock(&evdev->client_lock); | |
175 | list_del_rcu(&client->node); | |
176 | spin_unlock(&evdev->client_lock); | |
82ba56c2 | 177 | synchronize_rcu(); |
6addb1d6 DT |
178 | } |
179 | ||
180 | static int evdev_open_device(struct evdev *evdev) | |
181 | { | |
182 | int retval; | |
183 | ||
184 | retval = mutex_lock_interruptible(&evdev->mutex); | |
185 | if (retval) | |
186 | return retval; | |
187 | ||
188 | if (!evdev->exist) | |
189 | retval = -ENODEV; | |
06445014 | 190 | else if (!evdev->open++) { |
6addb1d6 | 191 | retval = input_open_device(&evdev->handle); |
06445014 ON |
192 | if (retval) |
193 | evdev->open--; | |
194 | } | |
6addb1d6 DT |
195 | |
196 | mutex_unlock(&evdev->mutex); | |
197 | return retval; | |
198 | } | |
199 | ||
200 | static void evdev_close_device(struct evdev *evdev) | |
201 | { | |
202 | mutex_lock(&evdev->mutex); | |
203 | ||
204 | if (evdev->exist && !--evdev->open) | |
205 | input_close_device(&evdev->handle); | |
206 | ||
207 | mutex_unlock(&evdev->mutex); | |
208 | } | |
209 | ||
210 | /* | |
211 | * Wake up users waiting for IO so they can disconnect from | |
212 | * dead device. | |
213 | */ | |
214 | static void evdev_hangup(struct evdev *evdev) | |
215 | { | |
216 | struct evdev_client *client; | |
217 | ||
218 | spin_lock(&evdev->client_lock); | |
219 | list_for_each_entry(client, &evdev->client_list, node) | |
220 | kill_fasync(&client->fasync, SIGIO, POLL_HUP); | |
221 | spin_unlock(&evdev->client_lock); | |
222 | ||
223 | wake_up_interruptible(&evdev->wait); | |
224 | } | |
225 | ||
d0ffb9be | 226 | static int evdev_release(struct inode *inode, struct file *file) |
1da177e4 | 227 | { |
d0ffb9be DT |
228 | struct evdev_client *client = file->private_data; |
229 | struct evdev *evdev = client->evdev; | |
1da177e4 | 230 | |
6addb1d6 DT |
231 | mutex_lock(&evdev->mutex); |
232 | if (evdev->grab == client) | |
233 | evdev_ungrab(evdev, client); | |
234 | mutex_unlock(&evdev->mutex); | |
1da177e4 | 235 | |
6addb1d6 | 236 | evdev_detach_client(evdev, client); |
d0ffb9be | 237 | kfree(client); |
1da177e4 | 238 | |
6addb1d6 | 239 | evdev_close_device(evdev); |
9657d75c | 240 | put_device(&evdev->dev); |
1da177e4 | 241 | |
1da177e4 LT |
242 | return 0; |
243 | } | |
244 | ||
d0ffb9be | 245 | static int evdev_open(struct inode *inode, struct file *file) |
1da177e4 | 246 | { |
d0ffb9be | 247 | struct evdev *evdev; |
6addb1d6 | 248 | struct evdev_client *client; |
1da177e4 | 249 | int i = iminor(inode) - EVDEV_MINOR_BASE; |
d542ed82 | 250 | int error; |
1da177e4 | 251 | |
d0ffb9be | 252 | if (i >= EVDEV_MINORS) |
1da177e4 LT |
253 | return -ENODEV; |
254 | ||
6addb1d6 DT |
255 | error = mutex_lock_interruptible(&evdev_table_mutex); |
256 | if (error) | |
257 | return error; | |
d0ffb9be | 258 | evdev = evdev_table[i]; |
6addb1d6 DT |
259 | if (evdev) |
260 | get_device(&evdev->dev); | |
261 | mutex_unlock(&evdev_table_mutex); | |
d0ffb9be | 262 | |
6addb1d6 | 263 | if (!evdev) |
1da177e4 LT |
264 | return -ENODEV; |
265 | ||
d0ffb9be | 266 | client = kzalloc(sizeof(struct evdev_client), GFP_KERNEL); |
9657d75c DT |
267 | if (!client) { |
268 | error = -ENOMEM; | |
269 | goto err_put_evdev; | |
270 | } | |
1da177e4 | 271 | |
6addb1d6 | 272 | spin_lock_init(&client->buffer_lock); |
d0ffb9be | 273 | client->evdev = evdev; |
6addb1d6 | 274 | evdev_attach_client(evdev, client); |
1da177e4 | 275 | |
6addb1d6 DT |
276 | error = evdev_open_device(evdev); |
277 | if (error) | |
278 | goto err_free_client; | |
1da177e4 | 279 | |
d0ffb9be | 280 | file->private_data = client; |
3d7bbd45 DT |
281 | nonseekable_open(inode, file); |
282 | ||
1da177e4 | 283 | return 0; |
9657d75c DT |
284 | |
285 | err_free_client: | |
6addb1d6 | 286 | evdev_detach_client(evdev, client); |
9657d75c DT |
287 | kfree(client); |
288 | err_put_evdev: | |
289 | put_device(&evdev->dev); | |
290 | return error; | |
1da177e4 LT |
291 | } |
292 | ||
6addb1d6 DT |
293 | static ssize_t evdev_write(struct file *file, const char __user *buffer, |
294 | size_t count, loff_t *ppos) | |
3a51f7c4 | 295 | { |
d0ffb9be DT |
296 | struct evdev_client *client = file->private_data; |
297 | struct evdev *evdev = client->evdev; | |
3a51f7c4 | 298 | struct input_event event; |
6addb1d6 | 299 | int retval; |
52658bb6 | 300 | |
6addb1d6 DT |
301 | retval = mutex_lock_interruptible(&evdev->mutex); |
302 | if (retval) | |
303 | return retval; | |
304 | ||
305 | if (!evdev->exist) { | |
306 | retval = -ENODEV; | |
307 | goto out; | |
308 | } | |
52658bb6 | 309 | |
3a51f7c4 DT |
310 | while (retval < count) { |
311 | ||
2d56f3a3 | 312 | if (input_event_from_user(buffer + retval, &event)) { |
6addb1d6 DT |
313 | retval = -EFAULT; |
314 | goto out; | |
315 | } | |
316 | ||
317 | input_inject_event(&evdev->handle, | |
318 | event.type, event.code, event.value); | |
2d56f3a3 | 319 | retval += input_event_size(); |
52658bb6 JK |
320 | } |
321 | ||
6addb1d6 DT |
322 | out: |
323 | mutex_unlock(&evdev->mutex); | |
52658bb6 JK |
324 | return retval; |
325 | } | |
52658bb6 | 326 | |
6addb1d6 DT |
327 | static int evdev_fetch_next_event(struct evdev_client *client, |
328 | struct input_event *event) | |
329 | { | |
330 | int have_event; | |
331 | ||
332 | spin_lock_irq(&client->buffer_lock); | |
333 | ||
334 | have_event = client->head != client->tail; | |
335 | if (have_event) { | |
336 | *event = client->buffer[client->tail++]; | |
337 | client->tail &= EVDEV_BUFFER_SIZE - 1; | |
338 | } | |
339 | ||
340 | spin_unlock_irq(&client->buffer_lock); | |
341 | ||
342 | return have_event; | |
343 | } | |
344 | ||
345 | static ssize_t evdev_read(struct file *file, char __user *buffer, | |
346 | size_t count, loff_t *ppos) | |
1da177e4 | 347 | { |
d0ffb9be DT |
348 | struct evdev_client *client = file->private_data; |
349 | struct evdev *evdev = client->evdev; | |
6addb1d6 | 350 | struct input_event event; |
1da177e4 LT |
351 | int retval; |
352 | ||
2d56f3a3 | 353 | if (count < input_event_size()) |
1da177e4 LT |
354 | return -EINVAL; |
355 | ||
6addb1d6 DT |
356 | if (client->head == client->tail && evdev->exist && |
357 | (file->f_flags & O_NONBLOCK)) | |
1da177e4 LT |
358 | return -EAGAIN; |
359 | ||
d0ffb9be DT |
360 | retval = wait_event_interruptible(evdev->wait, |
361 | client->head != client->tail || !evdev->exist); | |
1da177e4 LT |
362 | if (retval) |
363 | return retval; | |
364 | ||
d0ffb9be | 365 | if (!evdev->exist) |
1da177e4 LT |
366 | return -ENODEV; |
367 | ||
2d56f3a3 | 368 | while (retval + input_event_size() <= count && |
6addb1d6 | 369 | evdev_fetch_next_event(client, &event)) { |
3a51f7c4 | 370 | |
2d56f3a3 | 371 | if (input_event_to_user(buffer + retval, &event)) |
3a51f7c4 DT |
372 | return -EFAULT; |
373 | ||
2d56f3a3 | 374 | retval += input_event_size(); |
1da177e4 LT |
375 | } |
376 | ||
377 | return retval; | |
378 | } | |
379 | ||
380 | /* No kernel lock - fine */ | |
381 | static unsigned int evdev_poll(struct file *file, poll_table *wait) | |
382 | { | |
d0ffb9be DT |
383 | struct evdev_client *client = file->private_data; |
384 | struct evdev *evdev = client->evdev; | |
1e0afb28 | 385 | |
d0ffb9be DT |
386 | poll_wait(file, &evdev->wait, wait); |
387 | return ((client->head == client->tail) ? 0 : (POLLIN | POLLRDNORM)) | | |
388 | (evdev->exist ? 0 : (POLLHUP | POLLERR)); | |
1da177e4 LT |
389 | } |
390 | ||
3a51f7c4 DT |
391 | #ifdef CONFIG_COMPAT |
392 | ||
393 | #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) | |
7b19ada2 | 394 | #define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1) |
3a51f7c4 DT |
395 | |
396 | #ifdef __BIG_ENDIAN | |
397 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
398 | unsigned int maxlen, void __user *p, int compat) | |
399 | { | |
400 | int len, i; | |
401 | ||
402 | if (compat) { | |
7b19ada2 | 403 | len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t); |
bf61f8d3 | 404 | if (len > maxlen) |
3a51f7c4 DT |
405 | len = maxlen; |
406 | ||
407 | for (i = 0; i < len / sizeof(compat_long_t); i++) | |
408 | if (copy_to_user((compat_long_t __user *) p + i, | |
409 | (compat_long_t *) bits + | |
410 | i + 1 - ((i % 2) << 1), | |
411 | sizeof(compat_long_t))) | |
412 | return -EFAULT; | |
413 | } else { | |
7b19ada2 | 414 | len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
415 | if (len > maxlen) |
416 | len = maxlen; | |
417 | ||
418 | if (copy_to_user(p, bits, len)) | |
419 | return -EFAULT; | |
420 | } | |
421 | ||
422 | return len; | |
423 | } | |
424 | #else | |
425 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
426 | unsigned int maxlen, void __user *p, int compat) | |
427 | { | |
428 | int len = compat ? | |
7b19ada2 JS |
429 | BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) : |
430 | BITS_TO_LONGS(maxbit) * sizeof(long); | |
3a51f7c4 DT |
431 | |
432 | if (len > maxlen) | |
433 | len = maxlen; | |
434 | ||
435 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
436 | } | |
437 | #endif /* __BIG_ENDIAN */ | |
438 | ||
439 | #else | |
440 | ||
441 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
442 | unsigned int maxlen, void __user *p, int compat) | |
443 | { | |
7b19ada2 | 444 | int len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
445 | |
446 | if (len > maxlen) | |
447 | len = maxlen; | |
448 | ||
449 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
450 | } | |
451 | ||
452 | #endif /* CONFIG_COMPAT */ | |
453 | ||
454 | static int str_to_user(const char *str, unsigned int maxlen, void __user *p) | |
455 | { | |
456 | int len; | |
457 | ||
458 | if (!str) | |
459 | return -ENOENT; | |
460 | ||
461 | len = strlen(str) + 1; | |
462 | if (len > maxlen) | |
463 | len = maxlen; | |
464 | ||
465 | return copy_to_user(p, str, len) ? -EFAULT : len; | |
466 | } | |
467 | ||
f2afa771 | 468 | #define OLD_KEY_MAX 0x1ff |
5402a734 LT |
469 | static int handle_eviocgbit(struct input_dev *dev, unsigned int cmd, void __user *p, int compat_mode) |
470 | { | |
f2afa771 | 471 | static unsigned long keymax_warn_time; |
5402a734 LT |
472 | unsigned long *bits; |
473 | int len; | |
474 | ||
475 | switch (_IOC_NR(cmd) & EV_MAX) { | |
476 | ||
477 | case 0: bits = dev->evbit; len = EV_MAX; break; | |
478 | case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; | |
479 | case EV_REL: bits = dev->relbit; len = REL_MAX; break; | |
480 | case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; | |
481 | case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; | |
482 | case EV_LED: bits = dev->ledbit; len = LED_MAX; break; | |
483 | case EV_SND: bits = dev->sndbit; len = SND_MAX; break; | |
484 | case EV_FF: bits = dev->ffbit; len = FF_MAX; break; | |
485 | case EV_SW: bits = dev->swbit; len = SW_MAX; break; | |
486 | default: return -EINVAL; | |
487 | } | |
f2afa771 DT |
488 | |
489 | /* | |
490 | * Work around bugs in userspace programs that like to do | |
491 | * EVIOCGBIT(EV_KEY, KEY_MAX) and not realize that 'len' | |
492 | * should be in bytes, not in bits. | |
493 | */ | |
494 | if ((_IOC_NR(cmd) & EV_MAX) == EV_KEY && _IOC_SIZE(cmd) == OLD_KEY_MAX) { | |
495 | len = OLD_KEY_MAX; | |
496 | if (printk_timed_ratelimit(&keymax_warn_time, 10 * 1000)) | |
497 | printk(KERN_WARNING | |
c85e2031 GU |
498 | "evdev.c(EVIOCGBIT): Suspicious buffer size %u, " |
499 | "limiting output to %zu bytes. See " | |
f2afa771 DT |
500 | "http://userweb.kernel.org/~dtor/eviocgbit-bug.html\n", |
501 | OLD_KEY_MAX, | |
502 | BITS_TO_LONGS(OLD_KEY_MAX) * sizeof(long)); | |
503 | } | |
504 | ||
5402a734 LT |
505 | return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode); |
506 | } | |
f2afa771 | 507 | #undef OLD_KEY_MAX |
5402a734 | 508 | |
6addb1d6 DT |
509 | static long evdev_do_ioctl(struct file *file, unsigned int cmd, |
510 | void __user *p, int compat_mode) | |
1da177e4 | 511 | { |
d0ffb9be DT |
512 | struct evdev_client *client = file->private_data; |
513 | struct evdev *evdev = client->evdev; | |
1da177e4 LT |
514 | struct input_dev *dev = evdev->handle.dev; |
515 | struct input_absinfo abs; | |
509ca1a9 | 516 | struct ff_effect effect; |
3a51f7c4 | 517 | int __user *ip = (int __user *)p; |
58b93995 | 518 | unsigned int i, t, u, v; |
509ca1a9 | 519 | int error; |
1da177e4 | 520 | |
1da177e4 LT |
521 | switch (cmd) { |
522 | ||
6addb1d6 DT |
523 | case EVIOCGVERSION: |
524 | return put_user(EV_VERSION, ip); | |
1da177e4 | 525 | |
6addb1d6 DT |
526 | case EVIOCGID: |
527 | if (copy_to_user(p, &dev->id, sizeof(struct input_id))) | |
528 | return -EFAULT; | |
529 | return 0; | |
08791e5c | 530 | |
6addb1d6 DT |
531 | case EVIOCGREP: |
532 | if (!test_bit(EV_REP, dev->evbit)) | |
533 | return -ENOSYS; | |
534 | if (put_user(dev->rep[REP_DELAY], ip)) | |
535 | return -EFAULT; | |
536 | if (put_user(dev->rep[REP_PERIOD], ip + 1)) | |
537 | return -EFAULT; | |
538 | return 0; | |
08791e5c | 539 | |
6addb1d6 DT |
540 | case EVIOCSREP: |
541 | if (!test_bit(EV_REP, dev->evbit)) | |
542 | return -ENOSYS; | |
543 | if (get_user(u, ip)) | |
544 | return -EFAULT; | |
545 | if (get_user(v, ip + 1)) | |
546 | return -EFAULT; | |
08791e5c | 547 | |
6addb1d6 DT |
548 | input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u); |
549 | input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v); | |
3a51f7c4 | 550 | |
6addb1d6 | 551 | return 0; |
1da177e4 | 552 | |
6addb1d6 DT |
553 | case EVIOCGKEYCODE: |
554 | if (get_user(t, ip)) | |
555 | return -EFAULT; | |
c8e4c772 | 556 | |
f4f37c8e | 557 | error = input_get_keycode(dev, t, &v); |
6addb1d6 DT |
558 | if (error) |
559 | return error; | |
c8e4c772 | 560 | |
6addb1d6 DT |
561 | if (put_user(v, ip + 1)) |
562 | return -EFAULT; | |
c8e4c772 | 563 | |
6addb1d6 | 564 | return 0; |
1da177e4 | 565 | |
6addb1d6 DT |
566 | case EVIOCSKEYCODE: |
567 | if (get_user(t, ip) || get_user(v, ip + 1)) | |
568 | return -EFAULT; | |
3a51f7c4 | 569 | |
f4f37c8e | 570 | return input_set_keycode(dev, t, v); |
1da177e4 | 571 | |
6addb1d6 DT |
572 | case EVIOCRMFF: |
573 | return input_ff_erase(dev, (int)(unsigned long) p, file); | |
1da177e4 | 574 | |
6addb1d6 DT |
575 | case EVIOCGEFFECTS: |
576 | i = test_bit(EV_FF, dev->evbit) ? | |
577 | dev->ff->max_effects : 0; | |
578 | if (put_user(i, ip)) | |
579 | return -EFAULT; | |
580 | return 0; | |
581 | ||
582 | case EVIOCGRAB: | |
583 | if (p) | |
584 | return evdev_grab(evdev, client); | |
585 | else | |
586 | return evdev_ungrab(evdev, client); | |
1da177e4 | 587 | |
6addb1d6 | 588 | default: |
1da177e4 | 589 | |
6addb1d6 DT |
590 | if (_IOC_TYPE(cmd) != 'E') |
591 | return -EINVAL; | |
1da177e4 | 592 | |
6addb1d6 | 593 | if (_IOC_DIR(cmd) == _IOC_READ) { |
41e979f8 | 594 | |
5402a734 LT |
595 | if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0))) |
596 | return handle_eviocgbit(dev, cmd, p, compat_mode); | |
1da177e4 | 597 | |
6addb1d6 DT |
598 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) |
599 | return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd), | |
600 | p, compat_mode); | |
1da177e4 | 601 | |
6addb1d6 DT |
602 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) |
603 | return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd), | |
604 | p, compat_mode); | |
1da177e4 | 605 | |
6addb1d6 DT |
606 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) |
607 | return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd), | |
608 | p, compat_mode); | |
31581066 | 609 | |
6addb1d6 DT |
610 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0))) |
611 | return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd), | |
612 | p, compat_mode); | |
1da177e4 | 613 | |
6addb1d6 | 614 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) |
f9366014 | 615 | return str_to_user(dev->name, _IOC_SIZE(cmd), p); |
1da177e4 | 616 | |
6addb1d6 DT |
617 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) |
618 | return str_to_user(dev->phys, _IOC_SIZE(cmd), p); | |
1da177e4 | 619 | |
6addb1d6 DT |
620 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) |
621 | return str_to_user(dev->uniq, _IOC_SIZE(cmd), p); | |
1da177e4 | 622 | |
6addb1d6 | 623 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { |
1da177e4 | 624 | |
6addb1d6 | 625 | t = _IOC_NR(cmd) & ABS_MAX; |
1da177e4 | 626 | |
6addb1d6 DT |
627 | abs.value = dev->abs[t]; |
628 | abs.minimum = dev->absmin[t]; | |
629 | abs.maximum = dev->absmax[t]; | |
630 | abs.fuzz = dev->absfuzz[t]; | |
631 | abs.flat = dev->absflat[t]; | |
ec20a022 | 632 | abs.resolution = dev->absres[t]; |
41e979f8 | 633 | |
ec20a022 TS |
634 | if (copy_to_user(p, &abs, min_t(size_t, |
635 | _IOC_SIZE(cmd), | |
636 | sizeof(struct input_absinfo)))) | |
6addb1d6 | 637 | return -EFAULT; |
1da177e4 | 638 | |
6addb1d6 | 639 | return 0; |
1da177e4 LT |
640 | } |
641 | ||
6addb1d6 DT |
642 | } |
643 | ||
644 | if (_IOC_DIR(cmd) == _IOC_WRITE) { | |
1da177e4 | 645 | |
f2278f31 AD |
646 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCSFF)) { |
647 | ||
2d56f3a3 | 648 | if (input_ff_effect_from_user(p, _IOC_SIZE(cmd), &effect)) |
f2278f31 AD |
649 | return -EFAULT; |
650 | ||
651 | error = input_ff_upload(dev, &effect, file); | |
652 | ||
653 | if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) | |
654 | return -EFAULT; | |
655 | ||
656 | return error; | |
657 | } | |
658 | ||
6addb1d6 | 659 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { |
1da177e4 | 660 | |
6addb1d6 | 661 | t = _IOC_NR(cmd) & ABS_MAX; |
41e979f8 | 662 | |
ec20a022 TS |
663 | if (copy_from_user(&abs, p, min_t(size_t, |
664 | _IOC_SIZE(cmd), | |
665 | sizeof(struct input_absinfo)))) | |
6addb1d6 | 666 | return -EFAULT; |
1da177e4 | 667 | |
6addb1d6 DT |
668 | /* |
669 | * Take event lock to ensure that we are not | |
670 | * changing device parameters in the middle | |
671 | * of event. | |
672 | */ | |
673 | spin_lock_irq(&dev->event_lock); | |
1da177e4 | 674 | |
6addb1d6 DT |
675 | dev->abs[t] = abs.value; |
676 | dev->absmin[t] = abs.minimum; | |
677 | dev->absmax[t] = abs.maximum; | |
678 | dev->absfuzz[t] = abs.fuzz; | |
679 | dev->absflat[t] = abs.flat; | |
ec20a022 TS |
680 | dev->absres[t] = _IOC_SIZE(cmd) < sizeof(struct input_absinfo) ? |
681 | 0 : abs.resolution; | |
6addb1d6 DT |
682 | |
683 | spin_unlock_irq(&dev->event_lock); | |
684 | ||
685 | return 0; | |
1da177e4 | 686 | } |
6addb1d6 | 687 | } |
1da177e4 LT |
688 | } |
689 | return -EINVAL; | |
690 | } | |
1da177e4 | 691 | |
6addb1d6 DT |
692 | static long evdev_ioctl_handler(struct file *file, unsigned int cmd, |
693 | void __user *p, int compat_mode) | |
694 | { | |
695 | struct evdev_client *client = file->private_data; | |
696 | struct evdev *evdev = client->evdev; | |
697 | int retval; | |
698 | ||
699 | retval = mutex_lock_interruptible(&evdev->mutex); | |
700 | if (retval) | |
701 | return retval; | |
702 | ||
703 | if (!evdev->exist) { | |
704 | retval = -ENODEV; | |
705 | goto out; | |
706 | } | |
707 | ||
708 | retval = evdev_do_ioctl(file, cmd, p, compat_mode); | |
709 | ||
710 | out: | |
711 | mutex_unlock(&evdev->mutex); | |
712 | return retval; | |
713 | } | |
714 | ||
3a51f7c4 DT |
715 | static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
716 | { | |
717 | return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0); | |
718 | } | |
41e979f8 | 719 | |
3a51f7c4 | 720 | #ifdef CONFIG_COMPAT |
6addb1d6 DT |
721 | static long evdev_ioctl_compat(struct file *file, |
722 | unsigned int cmd, unsigned long arg) | |
52658bb6 | 723 | { |
3a51f7c4 | 724 | return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1); |
1da177e4 | 725 | } |
52658bb6 | 726 | #endif |
1da177e4 | 727 | |
66e66118 | 728 | static const struct file_operations evdev_fops = { |
6addb1d6 DT |
729 | .owner = THIS_MODULE, |
730 | .read = evdev_read, | |
731 | .write = evdev_write, | |
732 | .poll = evdev_poll, | |
733 | .open = evdev_open, | |
734 | .release = evdev_release, | |
735 | .unlocked_ioctl = evdev_ioctl, | |
52658bb6 | 736 | #ifdef CONFIG_COMPAT |
6addb1d6 | 737 | .compat_ioctl = evdev_ioctl_compat, |
52658bb6 | 738 | #endif |
6addb1d6 DT |
739 | .fasync = evdev_fasync, |
740 | .flush = evdev_flush | |
1da177e4 LT |
741 | }; |
742 | ||
6addb1d6 DT |
743 | static int evdev_install_chrdev(struct evdev *evdev) |
744 | { | |
745 | /* | |
746 | * No need to do any locking here as calls to connect and | |
747 | * disconnect are serialized by the input core | |
748 | */ | |
749 | evdev_table[evdev->minor] = evdev; | |
750 | return 0; | |
751 | } | |
752 | ||
753 | static void evdev_remove_chrdev(struct evdev *evdev) | |
754 | { | |
755 | /* | |
756 | * Lock evdev table to prevent race with evdev_open() | |
757 | */ | |
758 | mutex_lock(&evdev_table_mutex); | |
759 | evdev_table[evdev->minor] = NULL; | |
760 | mutex_unlock(&evdev_table_mutex); | |
761 | } | |
762 | ||
763 | /* | |
764 | * Mark device non-existent. This disables writes, ioctls and | |
765 | * prevents new users from opening the device. Already posted | |
766 | * blocking reads will stay, however new ones will fail. | |
767 | */ | |
768 | static void evdev_mark_dead(struct evdev *evdev) | |
769 | { | |
770 | mutex_lock(&evdev->mutex); | |
771 | evdev->exist = 0; | |
772 | mutex_unlock(&evdev->mutex); | |
773 | } | |
774 | ||
775 | static void evdev_cleanup(struct evdev *evdev) | |
776 | { | |
777 | struct input_handle *handle = &evdev->handle; | |
778 | ||
779 | evdev_mark_dead(evdev); | |
780 | evdev_hangup(evdev); | |
781 | evdev_remove_chrdev(evdev); | |
782 | ||
783 | /* evdev is marked dead so no one else accesses evdev->open */ | |
784 | if (evdev->open) { | |
785 | input_flush_device(handle, NULL); | |
786 | input_close_device(handle); | |
787 | } | |
788 | } | |
789 | ||
790 | /* | |
791 | * Create new evdev device. Note that input core serializes calls | |
792 | * to connect and disconnect so we don't need to lock evdev_table here. | |
793 | */ | |
5b2a0826 DT |
794 | static int evdev_connect(struct input_handler *handler, struct input_dev *dev, |
795 | const struct input_device_id *id) | |
1da177e4 LT |
796 | { |
797 | struct evdev *evdev; | |
798 | int minor; | |
5b2a0826 | 799 | int error; |
1da177e4 | 800 | |
6addb1d6 DT |
801 | for (minor = 0; minor < EVDEV_MINORS; minor++) |
802 | if (!evdev_table[minor]) | |
803 | break; | |
804 | ||
1da177e4 LT |
805 | if (minor == EVDEV_MINORS) { |
806 | printk(KERN_ERR "evdev: no more free evdev devices\n"); | |
5b2a0826 | 807 | return -ENFILE; |
1da177e4 LT |
808 | } |
809 | ||
5b2a0826 DT |
810 | evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL); |
811 | if (!evdev) | |
812 | return -ENOMEM; | |
1da177e4 | 813 | |
d0ffb9be | 814 | INIT_LIST_HEAD(&evdev->client_list); |
6addb1d6 DT |
815 | spin_lock_init(&evdev->client_lock); |
816 | mutex_init(&evdev->mutex); | |
1da177e4 LT |
817 | init_waitqueue_head(&evdev->wait); |
818 | ||
3d5cb60e | 819 | dev_set_name(&evdev->dev, "event%d", minor); |
1da177e4 LT |
820 | evdev->exist = 1; |
821 | evdev->minor = minor; | |
6addb1d6 | 822 | |
a7097ff8 | 823 | evdev->handle.dev = input_get_device(dev); |
3d5cb60e | 824 | evdev->handle.name = dev_name(&evdev->dev); |
1da177e4 LT |
825 | evdev->handle.handler = handler; |
826 | evdev->handle.private = evdev; | |
1da177e4 | 827 | |
6addb1d6 | 828 | evdev->dev.devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor); |
9657d75c DT |
829 | evdev->dev.class = &input_class; |
830 | evdev->dev.parent = &dev->dev; | |
9657d75c DT |
831 | evdev->dev.release = evdev_free; |
832 | device_initialize(&evdev->dev); | |
5b2a0826 | 833 | |
6addb1d6 | 834 | error = input_register_handle(&evdev->handle); |
5b2a0826 | 835 | if (error) |
9657d75c | 836 | goto err_free_evdev; |
5b2a0826 | 837 | |
6addb1d6 DT |
838 | error = evdev_install_chrdev(evdev); |
839 | if (error) | |
840 | goto err_unregister_handle; | |
841 | ||
842 | error = device_add(&evdev->dev); | |
5b2a0826 | 843 | if (error) |
6addb1d6 | 844 | goto err_cleanup_evdev; |
1da177e4 | 845 | |
5b2a0826 | 846 | return 0; |
1da177e4 | 847 | |
6addb1d6 DT |
848 | err_cleanup_evdev: |
849 | evdev_cleanup(evdev); | |
850 | err_unregister_handle: | |
851 | input_unregister_handle(&evdev->handle); | |
5b2a0826 | 852 | err_free_evdev: |
9657d75c | 853 | put_device(&evdev->dev); |
5b2a0826 | 854 | return error; |
1da177e4 LT |
855 | } |
856 | ||
857 | static void evdev_disconnect(struct input_handle *handle) | |
858 | { | |
859 | struct evdev *evdev = handle->private; | |
1da177e4 | 860 | |
9657d75c | 861 | device_del(&evdev->dev); |
6addb1d6 DT |
862 | evdev_cleanup(evdev); |
863 | input_unregister_handle(handle); | |
9657d75c | 864 | put_device(&evdev->dev); |
1da177e4 LT |
865 | } |
866 | ||
66e66118 | 867 | static const struct input_device_id evdev_ids[] = { |
1da177e4 LT |
868 | { .driver_info = 1 }, /* Matches all devices */ |
869 | { }, /* Terminating zero entry */ | |
870 | }; | |
871 | ||
872 | MODULE_DEVICE_TABLE(input, evdev_ids); | |
873 | ||
874 | static struct input_handler evdev_handler = { | |
6addb1d6 DT |
875 | .event = evdev_event, |
876 | .connect = evdev_connect, | |
877 | .disconnect = evdev_disconnect, | |
878 | .fops = &evdev_fops, | |
879 | .minor = EVDEV_MINOR_BASE, | |
880 | .name = "evdev", | |
881 | .id_table = evdev_ids, | |
1da177e4 LT |
882 | }; |
883 | ||
884 | static int __init evdev_init(void) | |
885 | { | |
4263cf0f | 886 | return input_register_handler(&evdev_handler); |
1da177e4 LT |
887 | } |
888 | ||
889 | static void __exit evdev_exit(void) | |
890 | { | |
891 | input_unregister_handler(&evdev_handler); | |
892 | } | |
893 | ||
894 | module_init(evdev_init); | |
895 | module_exit(evdev_exit); | |
896 | ||
897 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
898 | MODULE_DESCRIPTION("Input driver event char devices"); | |
899 | MODULE_LICENSE("GPL"); |