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Commit | Line | Data |
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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; |
1e0afb28 | 97 | |
60aa4924 | 98 | return fasync_helper(fd, file, on, &client->fasync); |
1da177e4 LT |
99 | } |
100 | ||
1e0afb28 | 101 | static int evdev_flush(struct file *file, fl_owner_t id) |
1da177e4 | 102 | { |
d0ffb9be DT |
103 | struct evdev_client *client = file->private_data; |
104 | struct evdev *evdev = client->evdev; | |
6addb1d6 DT |
105 | int retval; |
106 | ||
107 | retval = mutex_lock_interruptible(&evdev->mutex); | |
108 | if (retval) | |
109 | return retval; | |
1e0afb28 | 110 | |
d0ffb9be | 111 | if (!evdev->exist) |
6addb1d6 DT |
112 | retval = -ENODEV; |
113 | else | |
114 | retval = input_flush_device(&evdev->handle, file); | |
1e0afb28 | 115 | |
6addb1d6 DT |
116 | mutex_unlock(&evdev->mutex); |
117 | return retval; | |
1da177e4 LT |
118 | } |
119 | ||
9657d75c | 120 | static void evdev_free(struct device *dev) |
1da177e4 | 121 | { |
9657d75c DT |
122 | struct evdev *evdev = container_of(dev, struct evdev, dev); |
123 | ||
a7097ff8 | 124 | input_put_device(evdev->handle.dev); |
1da177e4 LT |
125 | kfree(evdev); |
126 | } | |
127 | ||
6addb1d6 DT |
128 | /* |
129 | * Grabs an event device (along with underlying input device). | |
130 | * This function is called with evdev->mutex taken. | |
131 | */ | |
132 | static int evdev_grab(struct evdev *evdev, struct evdev_client *client) | |
133 | { | |
134 | int error; | |
135 | ||
136 | if (evdev->grab) | |
137 | return -EBUSY; | |
138 | ||
139 | error = input_grab_device(&evdev->handle); | |
140 | if (error) | |
141 | return error; | |
142 | ||
143 | rcu_assign_pointer(evdev->grab, client); | |
82ba56c2 | 144 | synchronize_rcu(); |
6addb1d6 DT |
145 | |
146 | return 0; | |
147 | } | |
148 | ||
149 | static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client) | |
150 | { | |
151 | if (evdev->grab != client) | |
152 | return -EINVAL; | |
153 | ||
154 | rcu_assign_pointer(evdev->grab, NULL); | |
82ba56c2 | 155 | synchronize_rcu(); |
6addb1d6 DT |
156 | input_release_device(&evdev->handle); |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
161 | static void evdev_attach_client(struct evdev *evdev, | |
162 | struct evdev_client *client) | |
163 | { | |
164 | spin_lock(&evdev->client_lock); | |
165 | list_add_tail_rcu(&client->node, &evdev->client_list); | |
166 | spin_unlock(&evdev->client_lock); | |
82ba56c2 | 167 | synchronize_rcu(); |
6addb1d6 DT |
168 | } |
169 | ||
170 | static void evdev_detach_client(struct evdev *evdev, | |
171 | struct evdev_client *client) | |
172 | { | |
173 | spin_lock(&evdev->client_lock); | |
174 | list_del_rcu(&client->node); | |
175 | spin_unlock(&evdev->client_lock); | |
82ba56c2 | 176 | synchronize_rcu(); |
6addb1d6 DT |
177 | } |
178 | ||
179 | static int evdev_open_device(struct evdev *evdev) | |
180 | { | |
181 | int retval; | |
182 | ||
183 | retval = mutex_lock_interruptible(&evdev->mutex); | |
184 | if (retval) | |
185 | return retval; | |
186 | ||
187 | if (!evdev->exist) | |
188 | retval = -ENODEV; | |
06445014 | 189 | else if (!evdev->open++) { |
6addb1d6 | 190 | retval = input_open_device(&evdev->handle); |
06445014 ON |
191 | if (retval) |
192 | evdev->open--; | |
193 | } | |
6addb1d6 DT |
194 | |
195 | mutex_unlock(&evdev->mutex); | |
196 | return retval; | |
197 | } | |
198 | ||
199 | static void evdev_close_device(struct evdev *evdev) | |
200 | { | |
201 | mutex_lock(&evdev->mutex); | |
202 | ||
203 | if (evdev->exist && !--evdev->open) | |
204 | input_close_device(&evdev->handle); | |
205 | ||
206 | mutex_unlock(&evdev->mutex); | |
207 | } | |
208 | ||
209 | /* | |
210 | * Wake up users waiting for IO so they can disconnect from | |
211 | * dead device. | |
212 | */ | |
213 | static void evdev_hangup(struct evdev *evdev) | |
214 | { | |
215 | struct evdev_client *client; | |
216 | ||
217 | spin_lock(&evdev->client_lock); | |
218 | list_for_each_entry(client, &evdev->client_list, node) | |
219 | kill_fasync(&client->fasync, SIGIO, POLL_HUP); | |
220 | spin_unlock(&evdev->client_lock); | |
221 | ||
222 | wake_up_interruptible(&evdev->wait); | |
223 | } | |
224 | ||
d0ffb9be | 225 | static int evdev_release(struct inode *inode, struct file *file) |
1da177e4 | 226 | { |
d0ffb9be DT |
227 | struct evdev_client *client = file->private_data; |
228 | struct evdev *evdev = client->evdev; | |
1da177e4 | 229 | |
6addb1d6 DT |
230 | mutex_lock(&evdev->mutex); |
231 | if (evdev->grab == client) | |
232 | evdev_ungrab(evdev, client); | |
233 | mutex_unlock(&evdev->mutex); | |
1da177e4 | 234 | |
6addb1d6 | 235 | evdev_detach_client(evdev, client); |
d0ffb9be | 236 | kfree(client); |
1da177e4 | 237 | |
6addb1d6 | 238 | evdev_close_device(evdev); |
9657d75c | 239 | put_device(&evdev->dev); |
1da177e4 | 240 | |
1da177e4 LT |
241 | return 0; |
242 | } | |
243 | ||
d0ffb9be | 244 | static int evdev_open(struct inode *inode, struct file *file) |
1da177e4 | 245 | { |
d0ffb9be | 246 | struct evdev *evdev; |
6addb1d6 | 247 | struct evdev_client *client; |
1da177e4 | 248 | int i = iminor(inode) - EVDEV_MINOR_BASE; |
d542ed82 | 249 | int error; |
1da177e4 | 250 | |
d0ffb9be | 251 | if (i >= EVDEV_MINORS) |
1da177e4 LT |
252 | return -ENODEV; |
253 | ||
6addb1d6 DT |
254 | error = mutex_lock_interruptible(&evdev_table_mutex); |
255 | if (error) | |
256 | return error; | |
d0ffb9be | 257 | evdev = evdev_table[i]; |
6addb1d6 DT |
258 | if (evdev) |
259 | get_device(&evdev->dev); | |
260 | mutex_unlock(&evdev_table_mutex); | |
d0ffb9be | 261 | |
6addb1d6 | 262 | if (!evdev) |
1da177e4 LT |
263 | return -ENODEV; |
264 | ||
d0ffb9be | 265 | client = kzalloc(sizeof(struct evdev_client), GFP_KERNEL); |
9657d75c DT |
266 | if (!client) { |
267 | error = -ENOMEM; | |
268 | goto err_put_evdev; | |
269 | } | |
1da177e4 | 270 | |
6addb1d6 | 271 | spin_lock_init(&client->buffer_lock); |
d0ffb9be | 272 | client->evdev = evdev; |
6addb1d6 | 273 | evdev_attach_client(evdev, client); |
1da177e4 | 274 | |
6addb1d6 DT |
275 | error = evdev_open_device(evdev); |
276 | if (error) | |
277 | goto err_free_client; | |
1da177e4 | 278 | |
d0ffb9be | 279 | file->private_data = client; |
1da177e4 | 280 | return 0; |
9657d75c DT |
281 | |
282 | err_free_client: | |
6addb1d6 | 283 | evdev_detach_client(evdev, client); |
9657d75c DT |
284 | kfree(client); |
285 | err_put_evdev: | |
286 | put_device(&evdev->dev); | |
287 | return error; | |
1da177e4 LT |
288 | } |
289 | ||
6addb1d6 DT |
290 | static ssize_t evdev_write(struct file *file, const char __user *buffer, |
291 | size_t count, loff_t *ppos) | |
3a51f7c4 | 292 | { |
d0ffb9be DT |
293 | struct evdev_client *client = file->private_data; |
294 | struct evdev *evdev = client->evdev; | |
3a51f7c4 | 295 | struct input_event event; |
6addb1d6 | 296 | int retval; |
52658bb6 | 297 | |
6addb1d6 DT |
298 | retval = mutex_lock_interruptible(&evdev->mutex); |
299 | if (retval) | |
300 | return retval; | |
301 | ||
302 | if (!evdev->exist) { | |
303 | retval = -ENODEV; | |
304 | goto out; | |
305 | } | |
52658bb6 | 306 | |
3a51f7c4 DT |
307 | while (retval < count) { |
308 | ||
2d56f3a3 | 309 | if (input_event_from_user(buffer + retval, &event)) { |
6addb1d6 DT |
310 | retval = -EFAULT; |
311 | goto out; | |
312 | } | |
313 | ||
314 | input_inject_event(&evdev->handle, | |
315 | event.type, event.code, event.value); | |
2d56f3a3 | 316 | retval += input_event_size(); |
52658bb6 JK |
317 | } |
318 | ||
6addb1d6 DT |
319 | out: |
320 | mutex_unlock(&evdev->mutex); | |
52658bb6 JK |
321 | return retval; |
322 | } | |
52658bb6 | 323 | |
6addb1d6 DT |
324 | static int evdev_fetch_next_event(struct evdev_client *client, |
325 | struct input_event *event) | |
326 | { | |
327 | int have_event; | |
328 | ||
329 | spin_lock_irq(&client->buffer_lock); | |
330 | ||
331 | have_event = client->head != client->tail; | |
332 | if (have_event) { | |
333 | *event = client->buffer[client->tail++]; | |
334 | client->tail &= EVDEV_BUFFER_SIZE - 1; | |
335 | } | |
336 | ||
337 | spin_unlock_irq(&client->buffer_lock); | |
338 | ||
339 | return have_event; | |
340 | } | |
341 | ||
342 | static ssize_t evdev_read(struct file *file, char __user *buffer, | |
343 | size_t count, loff_t *ppos) | |
1da177e4 | 344 | { |
d0ffb9be DT |
345 | struct evdev_client *client = file->private_data; |
346 | struct evdev *evdev = client->evdev; | |
6addb1d6 | 347 | struct input_event event; |
1da177e4 LT |
348 | int retval; |
349 | ||
2d56f3a3 | 350 | if (count < input_event_size()) |
1da177e4 LT |
351 | return -EINVAL; |
352 | ||
6addb1d6 DT |
353 | if (client->head == client->tail && evdev->exist && |
354 | (file->f_flags & O_NONBLOCK)) | |
1da177e4 LT |
355 | return -EAGAIN; |
356 | ||
d0ffb9be DT |
357 | retval = wait_event_interruptible(evdev->wait, |
358 | client->head != client->tail || !evdev->exist); | |
1da177e4 LT |
359 | if (retval) |
360 | return retval; | |
361 | ||
d0ffb9be | 362 | if (!evdev->exist) |
1da177e4 LT |
363 | return -ENODEV; |
364 | ||
2d56f3a3 | 365 | while (retval + input_event_size() <= count && |
6addb1d6 | 366 | evdev_fetch_next_event(client, &event)) { |
3a51f7c4 | 367 | |
2d56f3a3 | 368 | if (input_event_to_user(buffer + retval, &event)) |
3a51f7c4 DT |
369 | return -EFAULT; |
370 | ||
2d56f3a3 | 371 | retval += input_event_size(); |
1da177e4 LT |
372 | } |
373 | ||
374 | return retval; | |
375 | } | |
376 | ||
377 | /* No kernel lock - fine */ | |
378 | static unsigned int evdev_poll(struct file *file, poll_table *wait) | |
379 | { | |
d0ffb9be DT |
380 | struct evdev_client *client = file->private_data; |
381 | struct evdev *evdev = client->evdev; | |
1e0afb28 | 382 | |
d0ffb9be DT |
383 | poll_wait(file, &evdev->wait, wait); |
384 | return ((client->head == client->tail) ? 0 : (POLLIN | POLLRDNORM)) | | |
385 | (evdev->exist ? 0 : (POLLHUP | POLLERR)); | |
1da177e4 LT |
386 | } |
387 | ||
3a51f7c4 DT |
388 | #ifdef CONFIG_COMPAT |
389 | ||
390 | #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) | |
7b19ada2 | 391 | #define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1) |
3a51f7c4 DT |
392 | |
393 | #ifdef __BIG_ENDIAN | |
394 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
395 | unsigned int maxlen, void __user *p, int compat) | |
396 | { | |
397 | int len, i; | |
398 | ||
399 | if (compat) { | |
7b19ada2 | 400 | len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t); |
bf61f8d3 | 401 | if (len > maxlen) |
3a51f7c4 DT |
402 | len = maxlen; |
403 | ||
404 | for (i = 0; i < len / sizeof(compat_long_t); i++) | |
405 | if (copy_to_user((compat_long_t __user *) p + i, | |
406 | (compat_long_t *) bits + | |
407 | i + 1 - ((i % 2) << 1), | |
408 | sizeof(compat_long_t))) | |
409 | return -EFAULT; | |
410 | } else { | |
7b19ada2 | 411 | len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
412 | if (len > maxlen) |
413 | len = maxlen; | |
414 | ||
415 | if (copy_to_user(p, bits, len)) | |
416 | return -EFAULT; | |
417 | } | |
418 | ||
419 | return len; | |
420 | } | |
421 | #else | |
422 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
423 | unsigned int maxlen, void __user *p, int compat) | |
424 | { | |
425 | int len = compat ? | |
7b19ada2 JS |
426 | BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) : |
427 | BITS_TO_LONGS(maxbit) * sizeof(long); | |
3a51f7c4 DT |
428 | |
429 | if (len > maxlen) | |
430 | len = maxlen; | |
431 | ||
432 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
433 | } | |
434 | #endif /* __BIG_ENDIAN */ | |
435 | ||
436 | #else | |
437 | ||
438 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
439 | unsigned int maxlen, void __user *p, int compat) | |
440 | { | |
7b19ada2 | 441 | int len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
442 | |
443 | if (len > maxlen) | |
444 | len = maxlen; | |
445 | ||
446 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
447 | } | |
448 | ||
449 | #endif /* CONFIG_COMPAT */ | |
450 | ||
451 | static int str_to_user(const char *str, unsigned int maxlen, void __user *p) | |
452 | { | |
453 | int len; | |
454 | ||
455 | if (!str) | |
456 | return -ENOENT; | |
457 | ||
458 | len = strlen(str) + 1; | |
459 | if (len > maxlen) | |
460 | len = maxlen; | |
461 | ||
462 | return copy_to_user(p, str, len) ? -EFAULT : len; | |
463 | } | |
464 | ||
f2afa771 | 465 | #define OLD_KEY_MAX 0x1ff |
5402a734 LT |
466 | static int handle_eviocgbit(struct input_dev *dev, unsigned int cmd, void __user *p, int compat_mode) |
467 | { | |
f2afa771 | 468 | static unsigned long keymax_warn_time; |
5402a734 LT |
469 | unsigned long *bits; |
470 | int len; | |
471 | ||
472 | switch (_IOC_NR(cmd) & EV_MAX) { | |
473 | ||
474 | case 0: bits = dev->evbit; len = EV_MAX; break; | |
475 | case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; | |
476 | case EV_REL: bits = dev->relbit; len = REL_MAX; break; | |
477 | case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; | |
478 | case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; | |
479 | case EV_LED: bits = dev->ledbit; len = LED_MAX; break; | |
480 | case EV_SND: bits = dev->sndbit; len = SND_MAX; break; | |
481 | case EV_FF: bits = dev->ffbit; len = FF_MAX; break; | |
482 | case EV_SW: bits = dev->swbit; len = SW_MAX; break; | |
483 | default: return -EINVAL; | |
484 | } | |
f2afa771 DT |
485 | |
486 | /* | |
487 | * Work around bugs in userspace programs that like to do | |
488 | * EVIOCGBIT(EV_KEY, KEY_MAX) and not realize that 'len' | |
489 | * should be in bytes, not in bits. | |
490 | */ | |
491 | if ((_IOC_NR(cmd) & EV_MAX) == EV_KEY && _IOC_SIZE(cmd) == OLD_KEY_MAX) { | |
492 | len = OLD_KEY_MAX; | |
493 | if (printk_timed_ratelimit(&keymax_warn_time, 10 * 1000)) | |
494 | printk(KERN_WARNING | |
c85e2031 GU |
495 | "evdev.c(EVIOCGBIT): Suspicious buffer size %u, " |
496 | "limiting output to %zu bytes. See " | |
f2afa771 DT |
497 | "http://userweb.kernel.org/~dtor/eviocgbit-bug.html\n", |
498 | OLD_KEY_MAX, | |
499 | BITS_TO_LONGS(OLD_KEY_MAX) * sizeof(long)); | |
500 | } | |
501 | ||
5402a734 LT |
502 | return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode); |
503 | } | |
f2afa771 | 504 | #undef OLD_KEY_MAX |
5402a734 | 505 | |
6addb1d6 DT |
506 | static long evdev_do_ioctl(struct file *file, unsigned int cmd, |
507 | void __user *p, int compat_mode) | |
1da177e4 | 508 | { |
d0ffb9be DT |
509 | struct evdev_client *client = file->private_data; |
510 | struct evdev *evdev = client->evdev; | |
1da177e4 LT |
511 | struct input_dev *dev = evdev->handle.dev; |
512 | struct input_absinfo abs; | |
509ca1a9 | 513 | struct ff_effect effect; |
3a51f7c4 | 514 | int __user *ip = (int __user *)p; |
1da177e4 | 515 | int i, t, u, v; |
509ca1a9 | 516 | int error; |
1da177e4 | 517 | |
1da177e4 LT |
518 | switch (cmd) { |
519 | ||
6addb1d6 DT |
520 | case EVIOCGVERSION: |
521 | return put_user(EV_VERSION, ip); | |
1da177e4 | 522 | |
6addb1d6 DT |
523 | case EVIOCGID: |
524 | if (copy_to_user(p, &dev->id, sizeof(struct input_id))) | |
525 | return -EFAULT; | |
526 | return 0; | |
08791e5c | 527 | |
6addb1d6 DT |
528 | case EVIOCGREP: |
529 | if (!test_bit(EV_REP, dev->evbit)) | |
530 | return -ENOSYS; | |
531 | if (put_user(dev->rep[REP_DELAY], ip)) | |
532 | return -EFAULT; | |
533 | if (put_user(dev->rep[REP_PERIOD], ip + 1)) | |
534 | return -EFAULT; | |
535 | return 0; | |
08791e5c | 536 | |
6addb1d6 DT |
537 | case EVIOCSREP: |
538 | if (!test_bit(EV_REP, dev->evbit)) | |
539 | return -ENOSYS; | |
540 | if (get_user(u, ip)) | |
541 | return -EFAULT; | |
542 | if (get_user(v, ip + 1)) | |
543 | return -EFAULT; | |
08791e5c | 544 | |
6addb1d6 DT |
545 | input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u); |
546 | input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v); | |
3a51f7c4 | 547 | |
6addb1d6 | 548 | return 0; |
1da177e4 | 549 | |
6addb1d6 DT |
550 | case EVIOCGKEYCODE: |
551 | if (get_user(t, ip)) | |
552 | return -EFAULT; | |
c8e4c772 | 553 | |
f4f37c8e | 554 | error = input_get_keycode(dev, t, &v); |
6addb1d6 DT |
555 | if (error) |
556 | return error; | |
c8e4c772 | 557 | |
6addb1d6 DT |
558 | if (put_user(v, ip + 1)) |
559 | return -EFAULT; | |
c8e4c772 | 560 | |
6addb1d6 | 561 | return 0; |
1da177e4 | 562 | |
6addb1d6 DT |
563 | case EVIOCSKEYCODE: |
564 | if (get_user(t, ip) || get_user(v, ip + 1)) | |
565 | return -EFAULT; | |
3a51f7c4 | 566 | |
f4f37c8e | 567 | return input_set_keycode(dev, t, v); |
1da177e4 | 568 | |
6addb1d6 DT |
569 | case EVIOCRMFF: |
570 | return input_ff_erase(dev, (int)(unsigned long) p, file); | |
1da177e4 | 571 | |
6addb1d6 DT |
572 | case EVIOCGEFFECTS: |
573 | i = test_bit(EV_FF, dev->evbit) ? | |
574 | dev->ff->max_effects : 0; | |
575 | if (put_user(i, ip)) | |
576 | return -EFAULT; | |
577 | return 0; | |
578 | ||
579 | case EVIOCGRAB: | |
580 | if (p) | |
581 | return evdev_grab(evdev, client); | |
582 | else | |
583 | return evdev_ungrab(evdev, client); | |
1da177e4 | 584 | |
6addb1d6 | 585 | default: |
1da177e4 | 586 | |
6addb1d6 DT |
587 | if (_IOC_TYPE(cmd) != 'E') |
588 | return -EINVAL; | |
1da177e4 | 589 | |
6addb1d6 | 590 | if (_IOC_DIR(cmd) == _IOC_READ) { |
41e979f8 | 591 | |
5402a734 LT |
592 | if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0))) |
593 | return handle_eviocgbit(dev, cmd, p, compat_mode); | |
1da177e4 | 594 | |
6addb1d6 DT |
595 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) |
596 | return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd), | |
597 | p, compat_mode); | |
1da177e4 | 598 | |
6addb1d6 DT |
599 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) |
600 | return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd), | |
601 | p, compat_mode); | |
1da177e4 | 602 | |
6addb1d6 DT |
603 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) |
604 | return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd), | |
605 | p, compat_mode); | |
31581066 | 606 | |
6addb1d6 DT |
607 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0))) |
608 | return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd), | |
609 | p, compat_mode); | |
1da177e4 | 610 | |
6addb1d6 DT |
611 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) |
612 | return str_to_user(dev->name, _IOC_SIZE(cmd), p); | |
1da177e4 | 613 | |
6addb1d6 DT |
614 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) |
615 | return str_to_user(dev->phys, _IOC_SIZE(cmd), p); | |
1da177e4 | 616 | |
6addb1d6 DT |
617 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) |
618 | return str_to_user(dev->uniq, _IOC_SIZE(cmd), p); | |
1da177e4 | 619 | |
6addb1d6 | 620 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { |
1da177e4 | 621 | |
6addb1d6 | 622 | t = _IOC_NR(cmd) & ABS_MAX; |
1da177e4 | 623 | |
6addb1d6 DT |
624 | abs.value = dev->abs[t]; |
625 | abs.minimum = dev->absmin[t]; | |
626 | abs.maximum = dev->absmax[t]; | |
627 | abs.fuzz = dev->absfuzz[t]; | |
628 | abs.flat = dev->absflat[t]; | |
41e979f8 | 629 | |
6addb1d6 DT |
630 | if (copy_to_user(p, &abs, sizeof(struct input_absinfo))) |
631 | return -EFAULT; | |
1da177e4 | 632 | |
6addb1d6 | 633 | return 0; |
1da177e4 LT |
634 | } |
635 | ||
6addb1d6 DT |
636 | } |
637 | ||
638 | if (_IOC_DIR(cmd) == _IOC_WRITE) { | |
1da177e4 | 639 | |
f2278f31 AD |
640 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCSFF)) { |
641 | ||
2d56f3a3 | 642 | if (input_ff_effect_from_user(p, _IOC_SIZE(cmd), &effect)) |
f2278f31 AD |
643 | return -EFAULT; |
644 | ||
645 | error = input_ff_upload(dev, &effect, file); | |
646 | ||
647 | if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) | |
648 | return -EFAULT; | |
649 | ||
650 | return error; | |
651 | } | |
652 | ||
6addb1d6 | 653 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { |
1da177e4 | 654 | |
6addb1d6 | 655 | t = _IOC_NR(cmd) & ABS_MAX; |
41e979f8 | 656 | |
6addb1d6 DT |
657 | if (copy_from_user(&abs, p, |
658 | sizeof(struct input_absinfo))) | |
659 | return -EFAULT; | |
1da177e4 | 660 | |
6addb1d6 DT |
661 | /* |
662 | * Take event lock to ensure that we are not | |
663 | * changing device parameters in the middle | |
664 | * of event. | |
665 | */ | |
666 | spin_lock_irq(&dev->event_lock); | |
1da177e4 | 667 | |
6addb1d6 DT |
668 | dev->abs[t] = abs.value; |
669 | dev->absmin[t] = abs.minimum; | |
670 | dev->absmax[t] = abs.maximum; | |
671 | dev->absfuzz[t] = abs.fuzz; | |
672 | dev->absflat[t] = abs.flat; | |
673 | ||
674 | spin_unlock_irq(&dev->event_lock); | |
675 | ||
676 | return 0; | |
1da177e4 | 677 | } |
6addb1d6 | 678 | } |
1da177e4 LT |
679 | } |
680 | return -EINVAL; | |
681 | } | |
1da177e4 | 682 | |
6addb1d6 DT |
683 | static long evdev_ioctl_handler(struct file *file, unsigned int cmd, |
684 | void __user *p, int compat_mode) | |
685 | { | |
686 | struct evdev_client *client = file->private_data; | |
687 | struct evdev *evdev = client->evdev; | |
688 | int retval; | |
689 | ||
690 | retval = mutex_lock_interruptible(&evdev->mutex); | |
691 | if (retval) | |
692 | return retval; | |
693 | ||
694 | if (!evdev->exist) { | |
695 | retval = -ENODEV; | |
696 | goto out; | |
697 | } | |
698 | ||
699 | retval = evdev_do_ioctl(file, cmd, p, compat_mode); | |
700 | ||
701 | out: | |
702 | mutex_unlock(&evdev->mutex); | |
703 | return retval; | |
704 | } | |
705 | ||
3a51f7c4 DT |
706 | static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
707 | { | |
708 | return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0); | |
709 | } | |
41e979f8 | 710 | |
3a51f7c4 | 711 | #ifdef CONFIG_COMPAT |
6addb1d6 DT |
712 | static long evdev_ioctl_compat(struct file *file, |
713 | unsigned int cmd, unsigned long arg) | |
52658bb6 | 714 | { |
3a51f7c4 | 715 | return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1); |
1da177e4 | 716 | } |
52658bb6 | 717 | #endif |
1da177e4 | 718 | |
66e66118 | 719 | static const struct file_operations evdev_fops = { |
6addb1d6 DT |
720 | .owner = THIS_MODULE, |
721 | .read = evdev_read, | |
722 | .write = evdev_write, | |
723 | .poll = evdev_poll, | |
724 | .open = evdev_open, | |
725 | .release = evdev_release, | |
726 | .unlocked_ioctl = evdev_ioctl, | |
52658bb6 | 727 | #ifdef CONFIG_COMPAT |
6addb1d6 | 728 | .compat_ioctl = evdev_ioctl_compat, |
52658bb6 | 729 | #endif |
6addb1d6 DT |
730 | .fasync = evdev_fasync, |
731 | .flush = evdev_flush | |
1da177e4 LT |
732 | }; |
733 | ||
6addb1d6 DT |
734 | static int evdev_install_chrdev(struct evdev *evdev) |
735 | { | |
736 | /* | |
737 | * No need to do any locking here as calls to connect and | |
738 | * disconnect are serialized by the input core | |
739 | */ | |
740 | evdev_table[evdev->minor] = evdev; | |
741 | return 0; | |
742 | } | |
743 | ||
744 | static void evdev_remove_chrdev(struct evdev *evdev) | |
745 | { | |
746 | /* | |
747 | * Lock evdev table to prevent race with evdev_open() | |
748 | */ | |
749 | mutex_lock(&evdev_table_mutex); | |
750 | evdev_table[evdev->minor] = NULL; | |
751 | mutex_unlock(&evdev_table_mutex); | |
752 | } | |
753 | ||
754 | /* | |
755 | * Mark device non-existent. This disables writes, ioctls and | |
756 | * prevents new users from opening the device. Already posted | |
757 | * blocking reads will stay, however new ones will fail. | |
758 | */ | |
759 | static void evdev_mark_dead(struct evdev *evdev) | |
760 | { | |
761 | mutex_lock(&evdev->mutex); | |
762 | evdev->exist = 0; | |
763 | mutex_unlock(&evdev->mutex); | |
764 | } | |
765 | ||
766 | static void evdev_cleanup(struct evdev *evdev) | |
767 | { | |
768 | struct input_handle *handle = &evdev->handle; | |
769 | ||
770 | evdev_mark_dead(evdev); | |
771 | evdev_hangup(evdev); | |
772 | evdev_remove_chrdev(evdev); | |
773 | ||
774 | /* evdev is marked dead so no one else accesses evdev->open */ | |
775 | if (evdev->open) { | |
776 | input_flush_device(handle, NULL); | |
777 | input_close_device(handle); | |
778 | } | |
779 | } | |
780 | ||
781 | /* | |
782 | * Create new evdev device. Note that input core serializes calls | |
783 | * to connect and disconnect so we don't need to lock evdev_table here. | |
784 | */ | |
5b2a0826 DT |
785 | static int evdev_connect(struct input_handler *handler, struct input_dev *dev, |
786 | const struct input_device_id *id) | |
1da177e4 LT |
787 | { |
788 | struct evdev *evdev; | |
789 | int minor; | |
5b2a0826 | 790 | int error; |
1da177e4 | 791 | |
6addb1d6 DT |
792 | for (minor = 0; minor < EVDEV_MINORS; minor++) |
793 | if (!evdev_table[minor]) | |
794 | break; | |
795 | ||
1da177e4 LT |
796 | if (minor == EVDEV_MINORS) { |
797 | printk(KERN_ERR "evdev: no more free evdev devices\n"); | |
5b2a0826 | 798 | return -ENFILE; |
1da177e4 LT |
799 | } |
800 | ||
5b2a0826 DT |
801 | evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL); |
802 | if (!evdev) | |
803 | return -ENOMEM; | |
1da177e4 | 804 | |
d0ffb9be | 805 | INIT_LIST_HEAD(&evdev->client_list); |
6addb1d6 DT |
806 | spin_lock_init(&evdev->client_lock); |
807 | mutex_init(&evdev->mutex); | |
1da177e4 LT |
808 | init_waitqueue_head(&evdev->wait); |
809 | ||
6addb1d6 | 810 | snprintf(evdev->name, sizeof(evdev->name), "event%d", minor); |
1da177e4 LT |
811 | evdev->exist = 1; |
812 | evdev->minor = minor; | |
6addb1d6 | 813 | |
a7097ff8 | 814 | evdev->handle.dev = input_get_device(dev); |
1da177e4 LT |
815 | evdev->handle.name = evdev->name; |
816 | evdev->handle.handler = handler; | |
817 | evdev->handle.private = evdev; | |
1da177e4 | 818 | |
a6c2490f | 819 | dev_set_name(&evdev->dev, evdev->name); |
6addb1d6 | 820 | evdev->dev.devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor); |
9657d75c DT |
821 | evdev->dev.class = &input_class; |
822 | evdev->dev.parent = &dev->dev; | |
9657d75c DT |
823 | evdev->dev.release = evdev_free; |
824 | device_initialize(&evdev->dev); | |
5b2a0826 | 825 | |
6addb1d6 | 826 | error = input_register_handle(&evdev->handle); |
5b2a0826 | 827 | if (error) |
9657d75c | 828 | goto err_free_evdev; |
5b2a0826 | 829 | |
6addb1d6 DT |
830 | error = evdev_install_chrdev(evdev); |
831 | if (error) | |
832 | goto err_unregister_handle; | |
833 | ||
834 | error = device_add(&evdev->dev); | |
5b2a0826 | 835 | if (error) |
6addb1d6 | 836 | goto err_cleanup_evdev; |
1da177e4 | 837 | |
5b2a0826 | 838 | return 0; |
1da177e4 | 839 | |
6addb1d6 DT |
840 | err_cleanup_evdev: |
841 | evdev_cleanup(evdev); | |
842 | err_unregister_handle: | |
843 | input_unregister_handle(&evdev->handle); | |
5b2a0826 | 844 | err_free_evdev: |
9657d75c | 845 | put_device(&evdev->dev); |
5b2a0826 | 846 | return error; |
1da177e4 LT |
847 | } |
848 | ||
849 | static void evdev_disconnect(struct input_handle *handle) | |
850 | { | |
851 | struct evdev *evdev = handle->private; | |
1da177e4 | 852 | |
9657d75c | 853 | device_del(&evdev->dev); |
6addb1d6 DT |
854 | evdev_cleanup(evdev); |
855 | input_unregister_handle(handle); | |
9657d75c | 856 | put_device(&evdev->dev); |
1da177e4 LT |
857 | } |
858 | ||
66e66118 | 859 | static const struct input_device_id evdev_ids[] = { |
1da177e4 LT |
860 | { .driver_info = 1 }, /* Matches all devices */ |
861 | { }, /* Terminating zero entry */ | |
862 | }; | |
863 | ||
864 | MODULE_DEVICE_TABLE(input, evdev_ids); | |
865 | ||
866 | static struct input_handler evdev_handler = { | |
6addb1d6 DT |
867 | .event = evdev_event, |
868 | .connect = evdev_connect, | |
869 | .disconnect = evdev_disconnect, | |
870 | .fops = &evdev_fops, | |
871 | .minor = EVDEV_MINOR_BASE, | |
872 | .name = "evdev", | |
873 | .id_table = evdev_ids, | |
1da177e4 LT |
874 | }; |
875 | ||
876 | static int __init evdev_init(void) | |
877 | { | |
4263cf0f | 878 | return input_register_handler(&evdev_handler); |
1da177e4 LT |
879 | } |
880 | ||
881 | static void __exit evdev_exit(void) | |
882 | { | |
883 | input_unregister_handler(&evdev_handler); | |
884 | } | |
885 | ||
886 | module_init(evdev_init); | |
887 | module_exit(evdev_exit); | |
888 | ||
889 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
890 | MODULE_DESCRIPTION("Input driver event char devices"); | |
891 | MODULE_LICENSE("GPL"); |