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; | |
1da177e4 LT |
28 | struct input_handle handle; |
29 | wait_queue_head_t wait; | |
d0ffb9be DT |
30 | struct evdev_client *grab; |
31 | struct list_head client_list; | |
6addb1d6 DT |
32 | spinlock_t client_lock; /* protects client_list */ |
33 | struct mutex mutex; | |
9657d75c | 34 | struct device dev; |
1da177e4 LT |
35 | }; |
36 | ||
d0ffb9be | 37 | struct evdev_client { |
1da177e4 LT |
38 | struct input_event buffer[EVDEV_BUFFER_SIZE]; |
39 | int head; | |
40 | int tail; | |
6addb1d6 | 41 | spinlock_t buffer_lock; /* protects access to buffer, head and tail */ |
1da177e4 LT |
42 | struct fasync_struct *fasync; |
43 | struct evdev *evdev; | |
44 | struct list_head node; | |
45 | }; | |
46 | ||
47 | static struct evdev *evdev_table[EVDEV_MINORS]; | |
6addb1d6 | 48 | static DEFINE_MUTEX(evdev_table_mutex); |
1da177e4 | 49 | |
6addb1d6 DT |
50 | static void evdev_pass_event(struct evdev_client *client, |
51 | struct input_event *event) | |
52 | { | |
53 | /* | |
54 | * Interrupts are disabled, just acquire the lock | |
55 | */ | |
56 | spin_lock(&client->buffer_lock); | |
57 | client->buffer[client->head++] = *event; | |
58 | client->head &= EVDEV_BUFFER_SIZE - 1; | |
59 | spin_unlock(&client->buffer_lock); | |
60 | ||
61 | kill_fasync(&client->fasync, SIGIO, POLL_IN); | |
62 | } | |
63 | ||
64 | /* | |
82ba56c2 | 65 | * Pass incoming event to all connected clients. |
6addb1d6 DT |
66 | */ |
67 | static void evdev_event(struct input_handle *handle, | |
68 | unsigned int type, unsigned int code, int value) | |
1da177e4 LT |
69 | { |
70 | struct evdev *evdev = handle->private; | |
d0ffb9be | 71 | struct evdev_client *client; |
6addb1d6 | 72 | struct input_event event; |
1da177e4 | 73 | |
6addb1d6 DT |
74 | do_gettimeofday(&event.time); |
75 | event.type = type; | |
76 | event.code = code; | |
77 | event.value = value; | |
1da177e4 | 78 | |
82ba56c2 DT |
79 | rcu_read_lock(); |
80 | ||
6addb1d6 DT |
81 | client = rcu_dereference(evdev->grab); |
82 | if (client) | |
83 | evdev_pass_event(client, &event); | |
84 | else | |
85 | list_for_each_entry_rcu(client, &evdev->client_list, node) | |
86 | evdev_pass_event(client, &event); | |
1da177e4 | 87 | |
82ba56c2 DT |
88 | rcu_read_unlock(); |
89 | ||
1da177e4 LT |
90 | wake_up_interruptible(&evdev->wait); |
91 | } | |
92 | ||
93 | static int evdev_fasync(int fd, struct file *file, int on) | |
94 | { | |
d0ffb9be | 95 | struct evdev_client *client = file->private_data; |
1e0afb28 | 96 | |
60aa4924 | 97 | return fasync_helper(fd, file, on, &client->fasync); |
1da177e4 LT |
98 | } |
99 | ||
1e0afb28 | 100 | static int evdev_flush(struct file *file, fl_owner_t id) |
1da177e4 | 101 | { |
d0ffb9be DT |
102 | struct evdev_client *client = file->private_data; |
103 | struct evdev *evdev = client->evdev; | |
6addb1d6 DT |
104 | int retval; |
105 | ||
106 | retval = mutex_lock_interruptible(&evdev->mutex); | |
107 | if (retval) | |
108 | return retval; | |
1e0afb28 | 109 | |
d0ffb9be | 110 | if (!evdev->exist) |
6addb1d6 DT |
111 | retval = -ENODEV; |
112 | else | |
113 | retval = input_flush_device(&evdev->handle, file); | |
1e0afb28 | 114 | |
6addb1d6 DT |
115 | mutex_unlock(&evdev->mutex); |
116 | return retval; | |
1da177e4 LT |
117 | } |
118 | ||
9657d75c | 119 | static void evdev_free(struct device *dev) |
1da177e4 | 120 | { |
9657d75c DT |
121 | struct evdev *evdev = container_of(dev, struct evdev, dev); |
122 | ||
a7097ff8 | 123 | input_put_device(evdev->handle.dev); |
1da177e4 LT |
124 | kfree(evdev); |
125 | } | |
126 | ||
6addb1d6 DT |
127 | /* |
128 | * Grabs an event device (along with underlying input device). | |
129 | * This function is called with evdev->mutex taken. | |
130 | */ | |
131 | static int evdev_grab(struct evdev *evdev, struct evdev_client *client) | |
132 | { | |
133 | int error; | |
134 | ||
135 | if (evdev->grab) | |
136 | return -EBUSY; | |
137 | ||
138 | error = input_grab_device(&evdev->handle); | |
139 | if (error) | |
140 | return error; | |
141 | ||
142 | rcu_assign_pointer(evdev->grab, client); | |
82ba56c2 | 143 | synchronize_rcu(); |
6addb1d6 DT |
144 | |
145 | return 0; | |
146 | } | |
147 | ||
148 | static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client) | |
149 | { | |
150 | if (evdev->grab != client) | |
151 | return -EINVAL; | |
152 | ||
153 | rcu_assign_pointer(evdev->grab, NULL); | |
82ba56c2 | 154 | synchronize_rcu(); |
6addb1d6 DT |
155 | input_release_device(&evdev->handle); |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
160 | static void evdev_attach_client(struct evdev *evdev, | |
161 | struct evdev_client *client) | |
162 | { | |
163 | spin_lock(&evdev->client_lock); | |
164 | list_add_tail_rcu(&client->node, &evdev->client_list); | |
165 | spin_unlock(&evdev->client_lock); | |
82ba56c2 | 166 | synchronize_rcu(); |
6addb1d6 DT |
167 | } |
168 | ||
169 | static void evdev_detach_client(struct evdev *evdev, | |
170 | struct evdev_client *client) | |
171 | { | |
172 | spin_lock(&evdev->client_lock); | |
173 | list_del_rcu(&client->node); | |
174 | spin_unlock(&evdev->client_lock); | |
82ba56c2 | 175 | synchronize_rcu(); |
6addb1d6 DT |
176 | } |
177 | ||
178 | static int evdev_open_device(struct evdev *evdev) | |
179 | { | |
180 | int retval; | |
181 | ||
182 | retval = mutex_lock_interruptible(&evdev->mutex); | |
183 | if (retval) | |
184 | return retval; | |
185 | ||
186 | if (!evdev->exist) | |
187 | retval = -ENODEV; | |
06445014 | 188 | else if (!evdev->open++) { |
6addb1d6 | 189 | retval = input_open_device(&evdev->handle); |
06445014 ON |
190 | if (retval) |
191 | evdev->open--; | |
192 | } | |
6addb1d6 DT |
193 | |
194 | mutex_unlock(&evdev->mutex); | |
195 | return retval; | |
196 | } | |
197 | ||
198 | static void evdev_close_device(struct evdev *evdev) | |
199 | { | |
200 | mutex_lock(&evdev->mutex); | |
201 | ||
202 | if (evdev->exist && !--evdev->open) | |
203 | input_close_device(&evdev->handle); | |
204 | ||
205 | mutex_unlock(&evdev->mutex); | |
206 | } | |
207 | ||
208 | /* | |
209 | * Wake up users waiting for IO so they can disconnect from | |
210 | * dead device. | |
211 | */ | |
212 | static void evdev_hangup(struct evdev *evdev) | |
213 | { | |
214 | struct evdev_client *client; | |
215 | ||
216 | spin_lock(&evdev->client_lock); | |
217 | list_for_each_entry(client, &evdev->client_list, node) | |
218 | kill_fasync(&client->fasync, SIGIO, POLL_HUP); | |
219 | spin_unlock(&evdev->client_lock); | |
220 | ||
221 | wake_up_interruptible(&evdev->wait); | |
222 | } | |
223 | ||
d0ffb9be | 224 | static int evdev_release(struct inode *inode, struct file *file) |
1da177e4 | 225 | { |
d0ffb9be DT |
226 | struct evdev_client *client = file->private_data; |
227 | struct evdev *evdev = client->evdev; | |
1da177e4 | 228 | |
6addb1d6 DT |
229 | mutex_lock(&evdev->mutex); |
230 | if (evdev->grab == client) | |
231 | evdev_ungrab(evdev, client); | |
232 | mutex_unlock(&evdev->mutex); | |
1da177e4 | 233 | |
6addb1d6 | 234 | evdev_detach_client(evdev, client); |
d0ffb9be | 235 | kfree(client); |
1da177e4 | 236 | |
6addb1d6 | 237 | evdev_close_device(evdev); |
9657d75c | 238 | put_device(&evdev->dev); |
1da177e4 | 239 | |
1da177e4 LT |
240 | return 0; |
241 | } | |
242 | ||
d0ffb9be | 243 | static int evdev_open(struct inode *inode, struct file *file) |
1da177e4 | 244 | { |
d0ffb9be | 245 | struct evdev *evdev; |
6addb1d6 | 246 | struct evdev_client *client; |
1da177e4 | 247 | int i = iminor(inode) - EVDEV_MINOR_BASE; |
d542ed82 | 248 | int error; |
1da177e4 | 249 | |
d0ffb9be | 250 | if (i >= EVDEV_MINORS) |
1da177e4 LT |
251 | return -ENODEV; |
252 | ||
6addb1d6 DT |
253 | error = mutex_lock_interruptible(&evdev_table_mutex); |
254 | if (error) | |
255 | return error; | |
d0ffb9be | 256 | evdev = evdev_table[i]; |
6addb1d6 DT |
257 | if (evdev) |
258 | get_device(&evdev->dev); | |
259 | mutex_unlock(&evdev_table_mutex); | |
d0ffb9be | 260 | |
6addb1d6 | 261 | if (!evdev) |
1da177e4 LT |
262 | return -ENODEV; |
263 | ||
d0ffb9be | 264 | client = kzalloc(sizeof(struct evdev_client), GFP_KERNEL); |
9657d75c DT |
265 | if (!client) { |
266 | error = -ENOMEM; | |
267 | goto err_put_evdev; | |
268 | } | |
1da177e4 | 269 | |
6addb1d6 | 270 | spin_lock_init(&client->buffer_lock); |
d0ffb9be | 271 | client->evdev = evdev; |
6addb1d6 | 272 | evdev_attach_client(evdev, client); |
1da177e4 | 273 | |
6addb1d6 DT |
274 | error = evdev_open_device(evdev); |
275 | if (error) | |
276 | goto err_free_client; | |
1da177e4 | 277 | |
d0ffb9be | 278 | file->private_data = client; |
1da177e4 | 279 | return 0; |
9657d75c DT |
280 | |
281 | err_free_client: | |
6addb1d6 | 282 | evdev_detach_client(evdev, client); |
9657d75c DT |
283 | kfree(client); |
284 | err_put_evdev: | |
285 | put_device(&evdev->dev); | |
286 | return error; | |
1da177e4 LT |
287 | } |
288 | ||
6addb1d6 DT |
289 | static ssize_t evdev_write(struct file *file, const char __user *buffer, |
290 | size_t count, loff_t *ppos) | |
3a51f7c4 | 291 | { |
d0ffb9be DT |
292 | struct evdev_client *client = file->private_data; |
293 | struct evdev *evdev = client->evdev; | |
3a51f7c4 | 294 | struct input_event event; |
6addb1d6 | 295 | int retval; |
52658bb6 | 296 | |
6addb1d6 DT |
297 | retval = mutex_lock_interruptible(&evdev->mutex); |
298 | if (retval) | |
299 | return retval; | |
300 | ||
301 | if (!evdev->exist) { | |
302 | retval = -ENODEV; | |
303 | goto out; | |
304 | } | |
52658bb6 | 305 | |
3a51f7c4 DT |
306 | while (retval < count) { |
307 | ||
2d56f3a3 | 308 | if (input_event_from_user(buffer + retval, &event)) { |
6addb1d6 DT |
309 | retval = -EFAULT; |
310 | goto out; | |
311 | } | |
312 | ||
313 | input_inject_event(&evdev->handle, | |
314 | event.type, event.code, event.value); | |
2d56f3a3 | 315 | retval += input_event_size(); |
52658bb6 JK |
316 | } |
317 | ||
6addb1d6 DT |
318 | out: |
319 | mutex_unlock(&evdev->mutex); | |
52658bb6 JK |
320 | return retval; |
321 | } | |
52658bb6 | 322 | |
6addb1d6 DT |
323 | static int evdev_fetch_next_event(struct evdev_client *client, |
324 | struct input_event *event) | |
325 | { | |
326 | int have_event; | |
327 | ||
328 | spin_lock_irq(&client->buffer_lock); | |
329 | ||
330 | have_event = client->head != client->tail; | |
331 | if (have_event) { | |
332 | *event = client->buffer[client->tail++]; | |
333 | client->tail &= EVDEV_BUFFER_SIZE - 1; | |
334 | } | |
335 | ||
336 | spin_unlock_irq(&client->buffer_lock); | |
337 | ||
338 | return have_event; | |
339 | } | |
340 | ||
341 | static ssize_t evdev_read(struct file *file, char __user *buffer, | |
342 | size_t count, loff_t *ppos) | |
1da177e4 | 343 | { |
d0ffb9be DT |
344 | struct evdev_client *client = file->private_data; |
345 | struct evdev *evdev = client->evdev; | |
6addb1d6 | 346 | struct input_event event; |
1da177e4 LT |
347 | int retval; |
348 | ||
2d56f3a3 | 349 | if (count < input_event_size()) |
1da177e4 LT |
350 | return -EINVAL; |
351 | ||
6addb1d6 DT |
352 | if (client->head == client->tail && evdev->exist && |
353 | (file->f_flags & O_NONBLOCK)) | |
1da177e4 LT |
354 | return -EAGAIN; |
355 | ||
d0ffb9be DT |
356 | retval = wait_event_interruptible(evdev->wait, |
357 | client->head != client->tail || !evdev->exist); | |
1da177e4 LT |
358 | if (retval) |
359 | return retval; | |
360 | ||
d0ffb9be | 361 | if (!evdev->exist) |
1da177e4 LT |
362 | return -ENODEV; |
363 | ||
2d56f3a3 | 364 | while (retval + input_event_size() <= count && |
6addb1d6 | 365 | evdev_fetch_next_event(client, &event)) { |
3a51f7c4 | 366 | |
2d56f3a3 | 367 | if (input_event_to_user(buffer + retval, &event)) |
3a51f7c4 DT |
368 | return -EFAULT; |
369 | ||
2d56f3a3 | 370 | retval += input_event_size(); |
1da177e4 LT |
371 | } |
372 | ||
373 | return retval; | |
374 | } | |
375 | ||
376 | /* No kernel lock - fine */ | |
377 | static unsigned int evdev_poll(struct file *file, poll_table *wait) | |
378 | { | |
d0ffb9be DT |
379 | struct evdev_client *client = file->private_data; |
380 | struct evdev *evdev = client->evdev; | |
1e0afb28 | 381 | |
d0ffb9be DT |
382 | poll_wait(file, &evdev->wait, wait); |
383 | return ((client->head == client->tail) ? 0 : (POLLIN | POLLRDNORM)) | | |
384 | (evdev->exist ? 0 : (POLLHUP | POLLERR)); | |
1da177e4 LT |
385 | } |
386 | ||
3a51f7c4 DT |
387 | #ifdef CONFIG_COMPAT |
388 | ||
389 | #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) | |
7b19ada2 | 390 | #define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1) |
3a51f7c4 DT |
391 | |
392 | #ifdef __BIG_ENDIAN | |
393 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
394 | unsigned int maxlen, void __user *p, int compat) | |
395 | { | |
396 | int len, i; | |
397 | ||
398 | if (compat) { | |
7b19ada2 | 399 | len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t); |
bf61f8d3 | 400 | if (len > maxlen) |
3a51f7c4 DT |
401 | len = maxlen; |
402 | ||
403 | for (i = 0; i < len / sizeof(compat_long_t); i++) | |
404 | if (copy_to_user((compat_long_t __user *) p + i, | |
405 | (compat_long_t *) bits + | |
406 | i + 1 - ((i % 2) << 1), | |
407 | sizeof(compat_long_t))) | |
408 | return -EFAULT; | |
409 | } else { | |
7b19ada2 | 410 | len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
411 | if (len > maxlen) |
412 | len = maxlen; | |
413 | ||
414 | if (copy_to_user(p, bits, len)) | |
415 | return -EFAULT; | |
416 | } | |
417 | ||
418 | return len; | |
419 | } | |
420 | #else | |
421 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
422 | unsigned int maxlen, void __user *p, int compat) | |
423 | { | |
424 | int len = compat ? | |
7b19ada2 JS |
425 | BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) : |
426 | BITS_TO_LONGS(maxbit) * sizeof(long); | |
3a51f7c4 DT |
427 | |
428 | if (len > maxlen) | |
429 | len = maxlen; | |
430 | ||
431 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
432 | } | |
433 | #endif /* __BIG_ENDIAN */ | |
434 | ||
435 | #else | |
436 | ||
437 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
438 | unsigned int maxlen, void __user *p, int compat) | |
439 | { | |
7b19ada2 | 440 | int len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
441 | |
442 | if (len > maxlen) | |
443 | len = maxlen; | |
444 | ||
445 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
446 | } | |
447 | ||
448 | #endif /* CONFIG_COMPAT */ | |
449 | ||
450 | static int str_to_user(const char *str, unsigned int maxlen, void __user *p) | |
451 | { | |
452 | int len; | |
453 | ||
454 | if (!str) | |
455 | return -ENOENT; | |
456 | ||
457 | len = strlen(str) + 1; | |
458 | if (len > maxlen) | |
459 | len = maxlen; | |
460 | ||
461 | return copy_to_user(p, str, len) ? -EFAULT : len; | |
462 | } | |
463 | ||
f2afa771 | 464 | #define OLD_KEY_MAX 0x1ff |
5402a734 LT |
465 | static int handle_eviocgbit(struct input_dev *dev, unsigned int cmd, void __user *p, int compat_mode) |
466 | { | |
f2afa771 | 467 | static unsigned long keymax_warn_time; |
5402a734 LT |
468 | unsigned long *bits; |
469 | int len; | |
470 | ||
471 | switch (_IOC_NR(cmd) & EV_MAX) { | |
472 | ||
473 | case 0: bits = dev->evbit; len = EV_MAX; break; | |
474 | case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; | |
475 | case EV_REL: bits = dev->relbit; len = REL_MAX; break; | |
476 | case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; | |
477 | case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; | |
478 | case EV_LED: bits = dev->ledbit; len = LED_MAX; break; | |
479 | case EV_SND: bits = dev->sndbit; len = SND_MAX; break; | |
480 | case EV_FF: bits = dev->ffbit; len = FF_MAX; break; | |
481 | case EV_SW: bits = dev->swbit; len = SW_MAX; break; | |
482 | default: return -EINVAL; | |
483 | } | |
f2afa771 DT |
484 | |
485 | /* | |
486 | * Work around bugs in userspace programs that like to do | |
487 | * EVIOCGBIT(EV_KEY, KEY_MAX) and not realize that 'len' | |
488 | * should be in bytes, not in bits. | |
489 | */ | |
490 | if ((_IOC_NR(cmd) & EV_MAX) == EV_KEY && _IOC_SIZE(cmd) == OLD_KEY_MAX) { | |
491 | len = OLD_KEY_MAX; | |
492 | if (printk_timed_ratelimit(&keymax_warn_time, 10 * 1000)) | |
493 | printk(KERN_WARNING | |
c85e2031 GU |
494 | "evdev.c(EVIOCGBIT): Suspicious buffer size %u, " |
495 | "limiting output to %zu bytes. See " | |
f2afa771 DT |
496 | "http://userweb.kernel.org/~dtor/eviocgbit-bug.html\n", |
497 | OLD_KEY_MAX, | |
498 | BITS_TO_LONGS(OLD_KEY_MAX) * sizeof(long)); | |
499 | } | |
500 | ||
5402a734 LT |
501 | return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode); |
502 | } | |
f2afa771 | 503 | #undef OLD_KEY_MAX |
5402a734 | 504 | |
6addb1d6 DT |
505 | static long evdev_do_ioctl(struct file *file, unsigned int cmd, |
506 | void __user *p, int compat_mode) | |
1da177e4 | 507 | { |
d0ffb9be DT |
508 | struct evdev_client *client = file->private_data; |
509 | struct evdev *evdev = client->evdev; | |
1da177e4 LT |
510 | struct input_dev *dev = evdev->handle.dev; |
511 | struct input_absinfo abs; | |
509ca1a9 | 512 | struct ff_effect effect; |
3a51f7c4 | 513 | int __user *ip = (int __user *)p; |
1da177e4 | 514 | int i, t, u, v; |
509ca1a9 | 515 | int error; |
1da177e4 | 516 | |
1da177e4 LT |
517 | switch (cmd) { |
518 | ||
6addb1d6 DT |
519 | case EVIOCGVERSION: |
520 | return put_user(EV_VERSION, ip); | |
1da177e4 | 521 | |
6addb1d6 DT |
522 | case EVIOCGID: |
523 | if (copy_to_user(p, &dev->id, sizeof(struct input_id))) | |
524 | return -EFAULT; | |
525 | return 0; | |
08791e5c | 526 | |
6addb1d6 DT |
527 | case EVIOCGREP: |
528 | if (!test_bit(EV_REP, dev->evbit)) | |
529 | return -ENOSYS; | |
530 | if (put_user(dev->rep[REP_DELAY], ip)) | |
531 | return -EFAULT; | |
532 | if (put_user(dev->rep[REP_PERIOD], ip + 1)) | |
533 | return -EFAULT; | |
534 | return 0; | |
08791e5c | 535 | |
6addb1d6 DT |
536 | case EVIOCSREP: |
537 | if (!test_bit(EV_REP, dev->evbit)) | |
538 | return -ENOSYS; | |
539 | if (get_user(u, ip)) | |
540 | return -EFAULT; | |
541 | if (get_user(v, ip + 1)) | |
542 | return -EFAULT; | |
08791e5c | 543 | |
6addb1d6 DT |
544 | input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u); |
545 | input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v); | |
3a51f7c4 | 546 | |
6addb1d6 | 547 | return 0; |
1da177e4 | 548 | |
6addb1d6 DT |
549 | case EVIOCGKEYCODE: |
550 | if (get_user(t, ip)) | |
551 | return -EFAULT; | |
c8e4c772 | 552 | |
f4f37c8e | 553 | error = input_get_keycode(dev, t, &v); |
6addb1d6 DT |
554 | if (error) |
555 | return error; | |
c8e4c772 | 556 | |
6addb1d6 DT |
557 | if (put_user(v, ip + 1)) |
558 | return -EFAULT; | |
c8e4c772 | 559 | |
6addb1d6 | 560 | return 0; |
1da177e4 | 561 | |
6addb1d6 DT |
562 | case EVIOCSKEYCODE: |
563 | if (get_user(t, ip) || get_user(v, ip + 1)) | |
564 | return -EFAULT; | |
3a51f7c4 | 565 | |
f4f37c8e | 566 | return input_set_keycode(dev, t, v); |
1da177e4 | 567 | |
6addb1d6 DT |
568 | case EVIOCRMFF: |
569 | return input_ff_erase(dev, (int)(unsigned long) p, file); | |
1da177e4 | 570 | |
6addb1d6 DT |
571 | case EVIOCGEFFECTS: |
572 | i = test_bit(EV_FF, dev->evbit) ? | |
573 | dev->ff->max_effects : 0; | |
574 | if (put_user(i, ip)) | |
575 | return -EFAULT; | |
576 | return 0; | |
577 | ||
578 | case EVIOCGRAB: | |
579 | if (p) | |
580 | return evdev_grab(evdev, client); | |
581 | else | |
582 | return evdev_ungrab(evdev, client); | |
1da177e4 | 583 | |
6addb1d6 | 584 | default: |
1da177e4 | 585 | |
6addb1d6 DT |
586 | if (_IOC_TYPE(cmd) != 'E') |
587 | return -EINVAL; | |
1da177e4 | 588 | |
6addb1d6 | 589 | if (_IOC_DIR(cmd) == _IOC_READ) { |
41e979f8 | 590 | |
5402a734 LT |
591 | if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0))) |
592 | return handle_eviocgbit(dev, cmd, p, compat_mode); | |
1da177e4 | 593 | |
6addb1d6 DT |
594 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) |
595 | return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd), | |
596 | p, compat_mode); | |
1da177e4 | 597 | |
6addb1d6 DT |
598 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) |
599 | return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd), | |
600 | p, compat_mode); | |
1da177e4 | 601 | |
6addb1d6 DT |
602 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) |
603 | return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd), | |
604 | p, compat_mode); | |
31581066 | 605 | |
6addb1d6 DT |
606 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0))) |
607 | return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd), | |
608 | p, compat_mode); | |
1da177e4 | 609 | |
6addb1d6 | 610 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) |
f9366014 | 611 | return str_to_user(dev->name, _IOC_SIZE(cmd), p); |
1da177e4 | 612 | |
6addb1d6 DT |
613 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) |
614 | return str_to_user(dev->phys, _IOC_SIZE(cmd), p); | |
1da177e4 | 615 | |
6addb1d6 DT |
616 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) |
617 | return str_to_user(dev->uniq, _IOC_SIZE(cmd), p); | |
1da177e4 | 618 | |
6addb1d6 | 619 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { |
1da177e4 | 620 | |
6addb1d6 | 621 | t = _IOC_NR(cmd) & ABS_MAX; |
1da177e4 | 622 | |
6addb1d6 DT |
623 | abs.value = dev->abs[t]; |
624 | abs.minimum = dev->absmin[t]; | |
625 | abs.maximum = dev->absmax[t]; | |
626 | abs.fuzz = dev->absfuzz[t]; | |
627 | abs.flat = dev->absflat[t]; | |
ec20a022 | 628 | abs.resolution = dev->absres[t]; |
41e979f8 | 629 | |
ec20a022 TS |
630 | if (copy_to_user(p, &abs, min_t(size_t, |
631 | _IOC_SIZE(cmd), | |
632 | sizeof(struct input_absinfo)))) | |
6addb1d6 | 633 | return -EFAULT; |
1da177e4 | 634 | |
6addb1d6 | 635 | return 0; |
1da177e4 LT |
636 | } |
637 | ||
6addb1d6 DT |
638 | } |
639 | ||
640 | if (_IOC_DIR(cmd) == _IOC_WRITE) { | |
1da177e4 | 641 | |
f2278f31 AD |
642 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCSFF)) { |
643 | ||
2d56f3a3 | 644 | if (input_ff_effect_from_user(p, _IOC_SIZE(cmd), &effect)) |
f2278f31 AD |
645 | return -EFAULT; |
646 | ||
647 | error = input_ff_upload(dev, &effect, file); | |
648 | ||
649 | if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) | |
650 | return -EFAULT; | |
651 | ||
652 | return error; | |
653 | } | |
654 | ||
6addb1d6 | 655 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { |
1da177e4 | 656 | |
6addb1d6 | 657 | t = _IOC_NR(cmd) & ABS_MAX; |
41e979f8 | 658 | |
ec20a022 TS |
659 | if (copy_from_user(&abs, p, min_t(size_t, |
660 | _IOC_SIZE(cmd), | |
661 | sizeof(struct input_absinfo)))) | |
6addb1d6 | 662 | return -EFAULT; |
1da177e4 | 663 | |
6addb1d6 DT |
664 | /* |
665 | * Take event lock to ensure that we are not | |
666 | * changing device parameters in the middle | |
667 | * of event. | |
668 | */ | |
669 | spin_lock_irq(&dev->event_lock); | |
1da177e4 | 670 | |
6addb1d6 DT |
671 | dev->abs[t] = abs.value; |
672 | dev->absmin[t] = abs.minimum; | |
673 | dev->absmax[t] = abs.maximum; | |
674 | dev->absfuzz[t] = abs.fuzz; | |
675 | dev->absflat[t] = abs.flat; | |
ec20a022 TS |
676 | dev->absres[t] = _IOC_SIZE(cmd) < sizeof(struct input_absinfo) ? |
677 | 0 : abs.resolution; | |
6addb1d6 DT |
678 | |
679 | spin_unlock_irq(&dev->event_lock); | |
680 | ||
681 | return 0; | |
1da177e4 | 682 | } |
6addb1d6 | 683 | } |
1da177e4 LT |
684 | } |
685 | return -EINVAL; | |
686 | } | |
1da177e4 | 687 | |
6addb1d6 DT |
688 | static long evdev_ioctl_handler(struct file *file, unsigned int cmd, |
689 | void __user *p, int compat_mode) | |
690 | { | |
691 | struct evdev_client *client = file->private_data; | |
692 | struct evdev *evdev = client->evdev; | |
693 | int retval; | |
694 | ||
695 | retval = mutex_lock_interruptible(&evdev->mutex); | |
696 | if (retval) | |
697 | return retval; | |
698 | ||
699 | if (!evdev->exist) { | |
700 | retval = -ENODEV; | |
701 | goto out; | |
702 | } | |
703 | ||
704 | retval = evdev_do_ioctl(file, cmd, p, compat_mode); | |
705 | ||
706 | out: | |
707 | mutex_unlock(&evdev->mutex); | |
708 | return retval; | |
709 | } | |
710 | ||
3a51f7c4 DT |
711 | static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
712 | { | |
713 | return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0); | |
714 | } | |
41e979f8 | 715 | |
3a51f7c4 | 716 | #ifdef CONFIG_COMPAT |
6addb1d6 DT |
717 | static long evdev_ioctl_compat(struct file *file, |
718 | unsigned int cmd, unsigned long arg) | |
52658bb6 | 719 | { |
3a51f7c4 | 720 | return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1); |
1da177e4 | 721 | } |
52658bb6 | 722 | #endif |
1da177e4 | 723 | |
66e66118 | 724 | static const struct file_operations evdev_fops = { |
6addb1d6 DT |
725 | .owner = THIS_MODULE, |
726 | .read = evdev_read, | |
727 | .write = evdev_write, | |
728 | .poll = evdev_poll, | |
729 | .open = evdev_open, | |
730 | .release = evdev_release, | |
731 | .unlocked_ioctl = evdev_ioctl, | |
52658bb6 | 732 | #ifdef CONFIG_COMPAT |
6addb1d6 | 733 | .compat_ioctl = evdev_ioctl_compat, |
52658bb6 | 734 | #endif |
6addb1d6 DT |
735 | .fasync = evdev_fasync, |
736 | .flush = evdev_flush | |
1da177e4 LT |
737 | }; |
738 | ||
6addb1d6 DT |
739 | static int evdev_install_chrdev(struct evdev *evdev) |
740 | { | |
741 | /* | |
742 | * No need to do any locking here as calls to connect and | |
743 | * disconnect are serialized by the input core | |
744 | */ | |
745 | evdev_table[evdev->minor] = evdev; | |
746 | return 0; | |
747 | } | |
748 | ||
749 | static void evdev_remove_chrdev(struct evdev *evdev) | |
750 | { | |
751 | /* | |
752 | * Lock evdev table to prevent race with evdev_open() | |
753 | */ | |
754 | mutex_lock(&evdev_table_mutex); | |
755 | evdev_table[evdev->minor] = NULL; | |
756 | mutex_unlock(&evdev_table_mutex); | |
757 | } | |
758 | ||
759 | /* | |
760 | * Mark device non-existent. This disables writes, ioctls and | |
761 | * prevents new users from opening the device. Already posted | |
762 | * blocking reads will stay, however new ones will fail. | |
763 | */ | |
764 | static void evdev_mark_dead(struct evdev *evdev) | |
765 | { | |
766 | mutex_lock(&evdev->mutex); | |
767 | evdev->exist = 0; | |
768 | mutex_unlock(&evdev->mutex); | |
769 | } | |
770 | ||
771 | static void evdev_cleanup(struct evdev *evdev) | |
772 | { | |
773 | struct input_handle *handle = &evdev->handle; | |
774 | ||
775 | evdev_mark_dead(evdev); | |
776 | evdev_hangup(evdev); | |
777 | evdev_remove_chrdev(evdev); | |
778 | ||
779 | /* evdev is marked dead so no one else accesses evdev->open */ | |
780 | if (evdev->open) { | |
781 | input_flush_device(handle, NULL); | |
782 | input_close_device(handle); | |
783 | } | |
784 | } | |
785 | ||
786 | /* | |
787 | * Create new evdev device. Note that input core serializes calls | |
788 | * to connect and disconnect so we don't need to lock evdev_table here. | |
789 | */ | |
5b2a0826 DT |
790 | static int evdev_connect(struct input_handler *handler, struct input_dev *dev, |
791 | const struct input_device_id *id) | |
1da177e4 LT |
792 | { |
793 | struct evdev *evdev; | |
794 | int minor; | |
5b2a0826 | 795 | int error; |
1da177e4 | 796 | |
6addb1d6 DT |
797 | for (minor = 0; minor < EVDEV_MINORS; minor++) |
798 | if (!evdev_table[minor]) | |
799 | break; | |
800 | ||
1da177e4 LT |
801 | if (minor == EVDEV_MINORS) { |
802 | printk(KERN_ERR "evdev: no more free evdev devices\n"); | |
5b2a0826 | 803 | return -ENFILE; |
1da177e4 LT |
804 | } |
805 | ||
5b2a0826 DT |
806 | evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL); |
807 | if (!evdev) | |
808 | return -ENOMEM; | |
1da177e4 | 809 | |
d0ffb9be | 810 | INIT_LIST_HEAD(&evdev->client_list); |
6addb1d6 DT |
811 | spin_lock_init(&evdev->client_lock); |
812 | mutex_init(&evdev->mutex); | |
1da177e4 LT |
813 | init_waitqueue_head(&evdev->wait); |
814 | ||
3d5cb60e | 815 | dev_set_name(&evdev->dev, "event%d", minor); |
1da177e4 LT |
816 | evdev->exist = 1; |
817 | evdev->minor = minor; | |
6addb1d6 | 818 | |
a7097ff8 | 819 | evdev->handle.dev = input_get_device(dev); |
3d5cb60e | 820 | evdev->handle.name = dev_name(&evdev->dev); |
1da177e4 LT |
821 | evdev->handle.handler = handler; |
822 | evdev->handle.private = evdev; | |
1da177e4 | 823 | |
6addb1d6 | 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"); |