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> |
2d56f3a3 | 22 | #include "input-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 | ||
6addb1d6 DT |
294 | static ssize_t evdev_write(struct file *file, const char __user *buffer, |
295 | size_t count, loff_t *ppos) | |
3a51f7c4 | 296 | { |
d0ffb9be DT |
297 | struct evdev_client *client = file->private_data; |
298 | struct evdev *evdev = client->evdev; | |
3a51f7c4 | 299 | struct input_event event; |
6addb1d6 | 300 | int retval; |
52658bb6 | 301 | |
6addb1d6 DT |
302 | retval = mutex_lock_interruptible(&evdev->mutex); |
303 | if (retval) | |
304 | return retval; | |
305 | ||
306 | if (!evdev->exist) { | |
307 | retval = -ENODEV; | |
308 | goto out; | |
309 | } | |
52658bb6 | 310 | |
3a51f7c4 DT |
311 | while (retval < count) { |
312 | ||
2d56f3a3 | 313 | if (input_event_from_user(buffer + retval, &event)) { |
6addb1d6 DT |
314 | retval = -EFAULT; |
315 | goto out; | |
316 | } | |
317 | ||
318 | input_inject_event(&evdev->handle, | |
319 | event.type, event.code, event.value); | |
2d56f3a3 | 320 | retval += input_event_size(); |
52658bb6 JK |
321 | } |
322 | ||
6addb1d6 DT |
323 | out: |
324 | mutex_unlock(&evdev->mutex); | |
52658bb6 JK |
325 | return retval; |
326 | } | |
52658bb6 | 327 | |
6addb1d6 DT |
328 | static int evdev_fetch_next_event(struct evdev_client *client, |
329 | struct input_event *event) | |
330 | { | |
331 | int have_event; | |
332 | ||
333 | spin_lock_irq(&client->buffer_lock); | |
334 | ||
335 | have_event = client->head != client->tail; | |
336 | if (have_event) { | |
337 | *event = client->buffer[client->tail++]; | |
338 | client->tail &= EVDEV_BUFFER_SIZE - 1; | |
339 | } | |
340 | ||
341 | spin_unlock_irq(&client->buffer_lock); | |
342 | ||
343 | return have_event; | |
344 | } | |
345 | ||
346 | static ssize_t evdev_read(struct file *file, char __user *buffer, | |
347 | size_t count, loff_t *ppos) | |
1da177e4 | 348 | { |
d0ffb9be DT |
349 | struct evdev_client *client = file->private_data; |
350 | struct evdev *evdev = client->evdev; | |
6addb1d6 | 351 | struct input_event event; |
1da177e4 LT |
352 | int retval; |
353 | ||
2d56f3a3 | 354 | if (count < input_event_size()) |
1da177e4 LT |
355 | return -EINVAL; |
356 | ||
6addb1d6 DT |
357 | if (client->head == client->tail && evdev->exist && |
358 | (file->f_flags & O_NONBLOCK)) | |
1da177e4 LT |
359 | return -EAGAIN; |
360 | ||
d0ffb9be DT |
361 | retval = wait_event_interruptible(evdev->wait, |
362 | client->head != client->tail || !evdev->exist); | |
1da177e4 LT |
363 | if (retval) |
364 | return retval; | |
365 | ||
d0ffb9be | 366 | if (!evdev->exist) |
1da177e4 LT |
367 | return -ENODEV; |
368 | ||
2d56f3a3 | 369 | while (retval + input_event_size() <= count && |
6addb1d6 | 370 | evdev_fetch_next_event(client, &event)) { |
3a51f7c4 | 371 | |
2d56f3a3 | 372 | if (input_event_to_user(buffer + retval, &event)) |
3a51f7c4 DT |
373 | return -EFAULT; |
374 | ||
2d56f3a3 | 375 | retval += input_event_size(); |
1da177e4 LT |
376 | } |
377 | ||
378 | return retval; | |
379 | } | |
380 | ||
381 | /* No kernel lock - fine */ | |
382 | static unsigned int evdev_poll(struct file *file, poll_table *wait) | |
383 | { | |
d0ffb9be DT |
384 | struct evdev_client *client = file->private_data; |
385 | struct evdev *evdev = client->evdev; | |
1e0afb28 | 386 | |
d0ffb9be DT |
387 | poll_wait(file, &evdev->wait, wait); |
388 | return ((client->head == client->tail) ? 0 : (POLLIN | POLLRDNORM)) | | |
389 | (evdev->exist ? 0 : (POLLHUP | POLLERR)); | |
1da177e4 LT |
390 | } |
391 | ||
3a51f7c4 DT |
392 | #ifdef CONFIG_COMPAT |
393 | ||
394 | #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) | |
7b19ada2 | 395 | #define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1) |
3a51f7c4 DT |
396 | |
397 | #ifdef __BIG_ENDIAN | |
398 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
399 | unsigned int maxlen, void __user *p, int compat) | |
400 | { | |
401 | int len, i; | |
402 | ||
403 | if (compat) { | |
7b19ada2 | 404 | len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t); |
bf61f8d3 | 405 | if (len > maxlen) |
3a51f7c4 DT |
406 | len = maxlen; |
407 | ||
408 | for (i = 0; i < len / sizeof(compat_long_t); i++) | |
409 | if (copy_to_user((compat_long_t __user *) p + i, | |
410 | (compat_long_t *) bits + | |
411 | i + 1 - ((i % 2) << 1), | |
412 | sizeof(compat_long_t))) | |
413 | return -EFAULT; | |
414 | } else { | |
7b19ada2 | 415 | len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
416 | if (len > maxlen) |
417 | len = maxlen; | |
418 | ||
419 | if (copy_to_user(p, bits, len)) | |
420 | return -EFAULT; | |
421 | } | |
422 | ||
423 | return len; | |
424 | } | |
425 | #else | |
426 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
427 | unsigned int maxlen, void __user *p, int compat) | |
428 | { | |
429 | int len = compat ? | |
7b19ada2 JS |
430 | BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) : |
431 | BITS_TO_LONGS(maxbit) * sizeof(long); | |
3a51f7c4 DT |
432 | |
433 | if (len > maxlen) | |
434 | len = maxlen; | |
435 | ||
436 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
437 | } | |
438 | #endif /* __BIG_ENDIAN */ | |
439 | ||
440 | #else | |
441 | ||
442 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
443 | unsigned int maxlen, void __user *p, int compat) | |
444 | { | |
7b19ada2 | 445 | int len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
446 | |
447 | if (len > maxlen) | |
448 | len = maxlen; | |
449 | ||
450 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
451 | } | |
452 | ||
453 | #endif /* CONFIG_COMPAT */ | |
454 | ||
455 | static int str_to_user(const char *str, unsigned int maxlen, void __user *p) | |
456 | { | |
457 | int len; | |
458 | ||
459 | if (!str) | |
460 | return -ENOENT; | |
461 | ||
462 | len = strlen(str) + 1; | |
463 | if (len > maxlen) | |
464 | len = maxlen; | |
465 | ||
466 | return copy_to_user(p, str, len) ? -EFAULT : len; | |
467 | } | |
468 | ||
f2afa771 | 469 | #define OLD_KEY_MAX 0x1ff |
5402a734 LT |
470 | static int handle_eviocgbit(struct input_dev *dev, unsigned int cmd, void __user *p, int compat_mode) |
471 | { | |
f2afa771 | 472 | static unsigned long keymax_warn_time; |
5402a734 LT |
473 | unsigned long *bits; |
474 | int len; | |
475 | ||
476 | switch (_IOC_NR(cmd) & EV_MAX) { | |
477 | ||
478 | case 0: bits = dev->evbit; len = EV_MAX; break; | |
479 | case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; | |
480 | case EV_REL: bits = dev->relbit; len = REL_MAX; break; | |
481 | case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; | |
482 | case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; | |
483 | case EV_LED: bits = dev->ledbit; len = LED_MAX; break; | |
484 | case EV_SND: bits = dev->sndbit; len = SND_MAX; break; | |
485 | case EV_FF: bits = dev->ffbit; len = FF_MAX; break; | |
486 | case EV_SW: bits = dev->swbit; len = SW_MAX; break; | |
487 | default: return -EINVAL; | |
488 | } | |
f2afa771 DT |
489 | |
490 | /* | |
491 | * Work around bugs in userspace programs that like to do | |
492 | * EVIOCGBIT(EV_KEY, KEY_MAX) and not realize that 'len' | |
493 | * should be in bytes, not in bits. | |
494 | */ | |
495 | if ((_IOC_NR(cmd) & EV_MAX) == EV_KEY && _IOC_SIZE(cmd) == OLD_KEY_MAX) { | |
496 | len = OLD_KEY_MAX; | |
497 | if (printk_timed_ratelimit(&keymax_warn_time, 10 * 1000)) | |
498 | printk(KERN_WARNING | |
c85e2031 GU |
499 | "evdev.c(EVIOCGBIT): Suspicious buffer size %u, " |
500 | "limiting output to %zu bytes. See " | |
f2afa771 DT |
501 | "http://userweb.kernel.org/~dtor/eviocgbit-bug.html\n", |
502 | OLD_KEY_MAX, | |
503 | BITS_TO_LONGS(OLD_KEY_MAX) * sizeof(long)); | |
504 | } | |
505 | ||
5402a734 LT |
506 | return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode); |
507 | } | |
f2afa771 | 508 | #undef OLD_KEY_MAX |
5402a734 | 509 | |
6addb1d6 DT |
510 | static long evdev_do_ioctl(struct file *file, unsigned int cmd, |
511 | void __user *p, int compat_mode) | |
1da177e4 | 512 | { |
d0ffb9be DT |
513 | struct evdev_client *client = file->private_data; |
514 | struct evdev *evdev = client->evdev; | |
1da177e4 LT |
515 | struct input_dev *dev = evdev->handle.dev; |
516 | struct input_absinfo abs; | |
509ca1a9 | 517 | struct ff_effect effect; |
3a51f7c4 | 518 | int __user *ip = (int __user *)p; |
1da177e4 | 519 | int i, t, u, v; |
509ca1a9 | 520 | int error; |
1da177e4 | 521 | |
1da177e4 LT |
522 | switch (cmd) { |
523 | ||
6addb1d6 DT |
524 | case EVIOCGVERSION: |
525 | return put_user(EV_VERSION, ip); | |
1da177e4 | 526 | |
6addb1d6 DT |
527 | case EVIOCGID: |
528 | if (copy_to_user(p, &dev->id, sizeof(struct input_id))) | |
529 | return -EFAULT; | |
530 | return 0; | |
08791e5c | 531 | |
6addb1d6 DT |
532 | case EVIOCGREP: |
533 | if (!test_bit(EV_REP, dev->evbit)) | |
534 | return -ENOSYS; | |
535 | if (put_user(dev->rep[REP_DELAY], ip)) | |
536 | return -EFAULT; | |
537 | if (put_user(dev->rep[REP_PERIOD], ip + 1)) | |
538 | return -EFAULT; | |
539 | return 0; | |
08791e5c | 540 | |
6addb1d6 DT |
541 | case EVIOCSREP: |
542 | if (!test_bit(EV_REP, dev->evbit)) | |
543 | return -ENOSYS; | |
544 | if (get_user(u, ip)) | |
545 | return -EFAULT; | |
546 | if (get_user(v, ip + 1)) | |
547 | return -EFAULT; | |
08791e5c | 548 | |
6addb1d6 DT |
549 | input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u); |
550 | input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v); | |
3a51f7c4 | 551 | |
6addb1d6 | 552 | return 0; |
1da177e4 | 553 | |
6addb1d6 DT |
554 | case EVIOCGKEYCODE: |
555 | if (get_user(t, ip)) | |
556 | return -EFAULT; | |
c8e4c772 | 557 | |
f4f37c8e | 558 | error = input_get_keycode(dev, t, &v); |
6addb1d6 DT |
559 | if (error) |
560 | return error; | |
c8e4c772 | 561 | |
6addb1d6 DT |
562 | if (put_user(v, ip + 1)) |
563 | return -EFAULT; | |
c8e4c772 | 564 | |
6addb1d6 | 565 | return 0; |
1da177e4 | 566 | |
6addb1d6 DT |
567 | case EVIOCSKEYCODE: |
568 | if (get_user(t, ip) || get_user(v, ip + 1)) | |
569 | return -EFAULT; | |
3a51f7c4 | 570 | |
f4f37c8e | 571 | return input_set_keycode(dev, t, v); |
1da177e4 | 572 | |
6addb1d6 DT |
573 | case EVIOCRMFF: |
574 | return input_ff_erase(dev, (int)(unsigned long) p, file); | |
1da177e4 | 575 | |
6addb1d6 DT |
576 | case EVIOCGEFFECTS: |
577 | i = test_bit(EV_FF, dev->evbit) ? | |
578 | dev->ff->max_effects : 0; | |
579 | if (put_user(i, ip)) | |
580 | return -EFAULT; | |
581 | return 0; | |
582 | ||
583 | case EVIOCGRAB: | |
584 | if (p) | |
585 | return evdev_grab(evdev, client); | |
586 | else | |
587 | return evdev_ungrab(evdev, client); | |
1da177e4 | 588 | |
6addb1d6 | 589 | default: |
1da177e4 | 590 | |
6addb1d6 DT |
591 | if (_IOC_TYPE(cmd) != 'E') |
592 | return -EINVAL; | |
1da177e4 | 593 | |
6addb1d6 | 594 | if (_IOC_DIR(cmd) == _IOC_READ) { |
41e979f8 | 595 | |
5402a734 LT |
596 | if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0))) |
597 | return handle_eviocgbit(dev, cmd, p, compat_mode); | |
1da177e4 | 598 | |
6addb1d6 DT |
599 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) |
600 | return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd), | |
601 | p, compat_mode); | |
1da177e4 | 602 | |
6addb1d6 DT |
603 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) |
604 | return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd), | |
605 | p, compat_mode); | |
1da177e4 | 606 | |
6addb1d6 DT |
607 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) |
608 | return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd), | |
609 | p, compat_mode); | |
31581066 | 610 | |
6addb1d6 DT |
611 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0))) |
612 | return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd), | |
613 | p, compat_mode); | |
1da177e4 | 614 | |
6addb1d6 DT |
615 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) |
616 | return str_to_user(dev->name, _IOC_SIZE(cmd), p); | |
1da177e4 | 617 | |
6addb1d6 DT |
618 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) |
619 | return str_to_user(dev->phys, _IOC_SIZE(cmd), p); | |
1da177e4 | 620 | |
6addb1d6 DT |
621 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) |
622 | return str_to_user(dev->uniq, _IOC_SIZE(cmd), p); | |
1da177e4 | 623 | |
6addb1d6 | 624 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { |
1da177e4 | 625 | |
6addb1d6 | 626 | t = _IOC_NR(cmd) & ABS_MAX; |
1da177e4 | 627 | |
6addb1d6 DT |
628 | abs.value = dev->abs[t]; |
629 | abs.minimum = dev->absmin[t]; | |
630 | abs.maximum = dev->absmax[t]; | |
631 | abs.fuzz = dev->absfuzz[t]; | |
632 | abs.flat = dev->absflat[t]; | |
41e979f8 | 633 | |
6addb1d6 DT |
634 | if (copy_to_user(p, &abs, sizeof(struct input_absinfo))) |
635 | return -EFAULT; | |
1da177e4 | 636 | |
6addb1d6 | 637 | return 0; |
1da177e4 LT |
638 | } |
639 | ||
6addb1d6 DT |
640 | } |
641 | ||
642 | if (_IOC_DIR(cmd) == _IOC_WRITE) { | |
1da177e4 | 643 | |
f2278f31 AD |
644 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCSFF)) { |
645 | ||
2d56f3a3 | 646 | if (input_ff_effect_from_user(p, _IOC_SIZE(cmd), &effect)) |
f2278f31 AD |
647 | return -EFAULT; |
648 | ||
649 | error = input_ff_upload(dev, &effect, file); | |
650 | ||
651 | if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) | |
652 | return -EFAULT; | |
653 | ||
654 | return error; | |
655 | } | |
656 | ||
6addb1d6 | 657 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { |
1da177e4 | 658 | |
6addb1d6 | 659 | t = _IOC_NR(cmd) & ABS_MAX; |
41e979f8 | 660 | |
6addb1d6 DT |
661 | if (copy_from_user(&abs, p, |
662 | sizeof(struct input_absinfo))) | |
663 | return -EFAULT; | |
1da177e4 | 664 | |
6addb1d6 DT |
665 | /* |
666 | * Take event lock to ensure that we are not | |
667 | * changing device parameters in the middle | |
668 | * of event. | |
669 | */ | |
670 | spin_lock_irq(&dev->event_lock); | |
1da177e4 | 671 | |
6addb1d6 DT |
672 | dev->abs[t] = abs.value; |
673 | dev->absmin[t] = abs.minimum; | |
674 | dev->absmax[t] = abs.maximum; | |
675 | dev->absfuzz[t] = abs.fuzz; | |
676 | dev->absflat[t] = abs.flat; | |
677 | ||
678 | spin_unlock_irq(&dev->event_lock); | |
679 | ||
680 | return 0; | |
1da177e4 | 681 | } |
6addb1d6 | 682 | } |
1da177e4 LT |
683 | } |
684 | return -EINVAL; | |
685 | } | |
1da177e4 | 686 | |
6addb1d6 DT |
687 | static long evdev_ioctl_handler(struct file *file, unsigned int cmd, |
688 | void __user *p, int compat_mode) | |
689 | { | |
690 | struct evdev_client *client = file->private_data; | |
691 | struct evdev *evdev = client->evdev; | |
692 | int retval; | |
693 | ||
694 | retval = mutex_lock_interruptible(&evdev->mutex); | |
695 | if (retval) | |
696 | return retval; | |
697 | ||
698 | if (!evdev->exist) { | |
699 | retval = -ENODEV; | |
700 | goto out; | |
701 | } | |
702 | ||
703 | retval = evdev_do_ioctl(file, cmd, p, compat_mode); | |
704 | ||
705 | out: | |
706 | mutex_unlock(&evdev->mutex); | |
707 | return retval; | |
708 | } | |
709 | ||
3a51f7c4 DT |
710 | static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
711 | { | |
712 | return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0); | |
713 | } | |
41e979f8 | 714 | |
3a51f7c4 | 715 | #ifdef CONFIG_COMPAT |
6addb1d6 DT |
716 | static long evdev_ioctl_compat(struct file *file, |
717 | unsigned int cmd, unsigned long arg) | |
52658bb6 | 718 | { |
3a51f7c4 | 719 | return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1); |
1da177e4 | 720 | } |
52658bb6 | 721 | #endif |
1da177e4 | 722 | |
66e66118 | 723 | static const struct file_operations evdev_fops = { |
6addb1d6 DT |
724 | .owner = THIS_MODULE, |
725 | .read = evdev_read, | |
726 | .write = evdev_write, | |
727 | .poll = evdev_poll, | |
728 | .open = evdev_open, | |
729 | .release = evdev_release, | |
730 | .unlocked_ioctl = evdev_ioctl, | |
52658bb6 | 731 | #ifdef CONFIG_COMPAT |
6addb1d6 | 732 | .compat_ioctl = evdev_ioctl_compat, |
52658bb6 | 733 | #endif |
6addb1d6 DT |
734 | .fasync = evdev_fasync, |
735 | .flush = evdev_flush | |
1da177e4 LT |
736 | }; |
737 | ||
6addb1d6 DT |
738 | static int evdev_install_chrdev(struct evdev *evdev) |
739 | { | |
740 | /* | |
741 | * No need to do any locking here as calls to connect and | |
742 | * disconnect are serialized by the input core | |
743 | */ | |
744 | evdev_table[evdev->minor] = evdev; | |
745 | return 0; | |
746 | } | |
747 | ||
748 | static void evdev_remove_chrdev(struct evdev *evdev) | |
749 | { | |
750 | /* | |
751 | * Lock evdev table to prevent race with evdev_open() | |
752 | */ | |
753 | mutex_lock(&evdev_table_mutex); | |
754 | evdev_table[evdev->minor] = NULL; | |
755 | mutex_unlock(&evdev_table_mutex); | |
756 | } | |
757 | ||
758 | /* | |
759 | * Mark device non-existent. This disables writes, ioctls and | |
760 | * prevents new users from opening the device. Already posted | |
761 | * blocking reads will stay, however new ones will fail. | |
762 | */ | |
763 | static void evdev_mark_dead(struct evdev *evdev) | |
764 | { | |
765 | mutex_lock(&evdev->mutex); | |
766 | evdev->exist = 0; | |
767 | mutex_unlock(&evdev->mutex); | |
768 | } | |
769 | ||
770 | static void evdev_cleanup(struct evdev *evdev) | |
771 | { | |
772 | struct input_handle *handle = &evdev->handle; | |
773 | ||
774 | evdev_mark_dead(evdev); | |
775 | evdev_hangup(evdev); | |
776 | evdev_remove_chrdev(evdev); | |
777 | ||
778 | /* evdev is marked dead so no one else accesses evdev->open */ | |
779 | if (evdev->open) { | |
780 | input_flush_device(handle, NULL); | |
781 | input_close_device(handle); | |
782 | } | |
783 | } | |
784 | ||
785 | /* | |
786 | * Create new evdev device. Note that input core serializes calls | |
787 | * to connect and disconnect so we don't need to lock evdev_table here. | |
788 | */ | |
5b2a0826 DT |
789 | static int evdev_connect(struct input_handler *handler, struct input_dev *dev, |
790 | const struct input_device_id *id) | |
1da177e4 LT |
791 | { |
792 | struct evdev *evdev; | |
793 | int minor; | |
5b2a0826 | 794 | int error; |
1da177e4 | 795 | |
6addb1d6 DT |
796 | for (minor = 0; minor < EVDEV_MINORS; minor++) |
797 | if (!evdev_table[minor]) | |
798 | break; | |
799 | ||
1da177e4 LT |
800 | if (minor == EVDEV_MINORS) { |
801 | printk(KERN_ERR "evdev: no more free evdev devices\n"); | |
5b2a0826 | 802 | return -ENFILE; |
1da177e4 LT |
803 | } |
804 | ||
5b2a0826 DT |
805 | evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL); |
806 | if (!evdev) | |
807 | return -ENOMEM; | |
1da177e4 | 808 | |
d0ffb9be | 809 | INIT_LIST_HEAD(&evdev->client_list); |
6addb1d6 DT |
810 | spin_lock_init(&evdev->client_lock); |
811 | mutex_init(&evdev->mutex); | |
1da177e4 LT |
812 | init_waitqueue_head(&evdev->wait); |
813 | ||
6addb1d6 | 814 | snprintf(evdev->name, sizeof(evdev->name), "event%d", minor); |
1da177e4 LT |
815 | evdev->exist = 1; |
816 | evdev->minor = minor; | |
6addb1d6 | 817 | |
a7097ff8 | 818 | evdev->handle.dev = input_get_device(dev); |
1da177e4 LT |
819 | evdev->handle.name = evdev->name; |
820 | evdev->handle.handler = handler; | |
821 | evdev->handle.private = evdev; | |
1da177e4 | 822 | |
6addb1d6 DT |
823 | strlcpy(evdev->dev.bus_id, evdev->name, sizeof(evdev->dev.bus_id)); |
824 | evdev->dev.devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor); | |
9657d75c DT |
825 | evdev->dev.class = &input_class; |
826 | evdev->dev.parent = &dev->dev; | |
9657d75c DT |
827 | evdev->dev.release = evdev_free; |
828 | device_initialize(&evdev->dev); | |
5b2a0826 | 829 | |
6addb1d6 | 830 | error = input_register_handle(&evdev->handle); |
5b2a0826 | 831 | if (error) |
9657d75c | 832 | goto err_free_evdev; |
5b2a0826 | 833 | |
6addb1d6 DT |
834 | error = evdev_install_chrdev(evdev); |
835 | if (error) | |
836 | goto err_unregister_handle; | |
837 | ||
838 | error = device_add(&evdev->dev); | |
5b2a0826 | 839 | if (error) |
6addb1d6 | 840 | goto err_cleanup_evdev; |
1da177e4 | 841 | |
5b2a0826 | 842 | return 0; |
1da177e4 | 843 | |
6addb1d6 DT |
844 | err_cleanup_evdev: |
845 | evdev_cleanup(evdev); | |
846 | err_unregister_handle: | |
847 | input_unregister_handle(&evdev->handle); | |
5b2a0826 | 848 | err_free_evdev: |
9657d75c | 849 | put_device(&evdev->dev); |
5b2a0826 | 850 | return error; |
1da177e4 LT |
851 | } |
852 | ||
853 | static void evdev_disconnect(struct input_handle *handle) | |
854 | { | |
855 | struct evdev *evdev = handle->private; | |
1da177e4 | 856 | |
9657d75c | 857 | device_del(&evdev->dev); |
6addb1d6 DT |
858 | evdev_cleanup(evdev); |
859 | input_unregister_handle(handle); | |
9657d75c | 860 | put_device(&evdev->dev); |
1da177e4 LT |
861 | } |
862 | ||
66e66118 | 863 | static const struct input_device_id evdev_ids[] = { |
1da177e4 LT |
864 | { .driver_info = 1 }, /* Matches all devices */ |
865 | { }, /* Terminating zero entry */ | |
866 | }; | |
867 | ||
868 | MODULE_DEVICE_TABLE(input, evdev_ids); | |
869 | ||
870 | static struct input_handler evdev_handler = { | |
6addb1d6 DT |
871 | .event = evdev_event, |
872 | .connect = evdev_connect, | |
873 | .disconnect = evdev_disconnect, | |
874 | .fops = &evdev_fops, | |
875 | .minor = EVDEV_MINOR_BASE, | |
876 | .name = "evdev", | |
877 | .id_table = evdev_ids, | |
1da177e4 LT |
878 | }; |
879 | ||
880 | static int __init evdev_init(void) | |
881 | { | |
4263cf0f | 882 | return input_register_handler(&evdev_handler); |
1da177e4 LT |
883 | } |
884 | ||
885 | static void __exit evdev_exit(void) | |
886 | { | |
887 | input_unregister_handler(&evdev_handler); | |
888 | } | |
889 | ||
890 | module_init(evdev_init); | |
891 | module_exit(evdev_exit); | |
892 | ||
893 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
894 | MODULE_DESCRIPTION("Input driver event char devices"); | |
895 | MODULE_LICENSE("GPL"); |