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 | |
63a6404d HR |
13 | #define EVDEV_MIN_BUFFER_SIZE 64U |
14 | #define EVDEV_BUF_PACKETS 8 | |
1da177e4 LT |
15 | |
16 | #include <linux/poll.h> | |
a99bbaf5 | 17 | #include <linux/sched.h> |
1da177e4 LT |
18 | #include <linux/slab.h> |
19 | #include <linux/module.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/input.h> | |
22 | #include <linux/major.h> | |
1da177e4 | 23 | #include <linux/device.h> |
2d56f3a3 | 24 | #include "input-compat.h" |
1da177e4 LT |
25 | |
26 | struct evdev { | |
27 | int exist; | |
28 | int open; | |
29 | int minor; | |
1da177e4 LT |
30 | struct input_handle handle; |
31 | wait_queue_head_t wait; | |
d0ffb9be DT |
32 | struct evdev_client *grab; |
33 | struct list_head client_list; | |
6addb1d6 DT |
34 | spinlock_t client_lock; /* protects client_list */ |
35 | struct mutex mutex; | |
9657d75c | 36 | struct device dev; |
1da177e4 LT |
37 | }; |
38 | ||
d0ffb9be | 39 | struct evdev_client { |
1da177e4 LT |
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; | |
b58f7086 HR |
46 | int bufsize; |
47 | struct input_event buffer[]; | |
1da177e4 LT |
48 | }; |
49 | ||
50 | static struct evdev *evdev_table[EVDEV_MINORS]; | |
6addb1d6 | 51 | static DEFINE_MUTEX(evdev_table_mutex); |
1da177e4 | 52 | |
6addb1d6 DT |
53 | static void evdev_pass_event(struct evdev_client *client, |
54 | struct input_event *event) | |
55 | { | |
56 | /* | |
57 | * Interrupts are disabled, just acquire the lock | |
58 | */ | |
59 | spin_lock(&client->buffer_lock); | |
60 | client->buffer[client->head++] = *event; | |
b58f7086 | 61 | client->head &= client->bufsize - 1; |
6addb1d6 DT |
62 | spin_unlock(&client->buffer_lock); |
63 | ||
30a589fd AJ |
64 | if (event->type == EV_SYN) |
65 | kill_fasync(&client->fasync, SIGIO, POLL_IN); | |
6addb1d6 DT |
66 | } |
67 | ||
68 | /* | |
82ba56c2 | 69 | * Pass incoming event to all connected clients. |
6addb1d6 DT |
70 | */ |
71 | static void evdev_event(struct input_handle *handle, | |
72 | unsigned int type, unsigned int code, int value) | |
1da177e4 LT |
73 | { |
74 | struct evdev *evdev = handle->private; | |
d0ffb9be | 75 | struct evdev_client *client; |
6addb1d6 | 76 | struct input_event event; |
1da177e4 | 77 | |
6addb1d6 DT |
78 | do_gettimeofday(&event.time); |
79 | event.type = type; | |
80 | event.code = code; | |
81 | event.value = value; | |
1da177e4 | 82 | |
82ba56c2 DT |
83 | rcu_read_lock(); |
84 | ||
6addb1d6 DT |
85 | client = rcu_dereference(evdev->grab); |
86 | if (client) | |
87 | evdev_pass_event(client, &event); | |
88 | else | |
89 | list_for_each_entry_rcu(client, &evdev->client_list, node) | |
90 | evdev_pass_event(client, &event); | |
1da177e4 | 91 | |
82ba56c2 DT |
92 | rcu_read_unlock(); |
93 | ||
1da177e4 LT |
94 | wake_up_interruptible(&evdev->wait); |
95 | } | |
96 | ||
97 | static int evdev_fasync(int fd, struct file *file, int on) | |
98 | { | |
d0ffb9be | 99 | struct evdev_client *client = file->private_data; |
1e0afb28 | 100 | |
60aa4924 | 101 | return fasync_helper(fd, file, on, &client->fasync); |
1da177e4 LT |
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 | 237 | |
6addb1d6 | 238 | evdev_detach_client(evdev, client); |
d0ffb9be | 239 | kfree(client); |
1da177e4 | 240 | |
6addb1d6 | 241 | evdev_close_device(evdev); |
9657d75c | 242 | put_device(&evdev->dev); |
1da177e4 | 243 | |
1da177e4 LT |
244 | return 0; |
245 | } | |
246 | ||
b58f7086 HR |
247 | static unsigned int evdev_compute_buffer_size(struct input_dev *dev) |
248 | { | |
63a6404d HR |
249 | unsigned int n_events = |
250 | max(dev->hint_events_per_packet * EVDEV_BUF_PACKETS, | |
251 | EVDEV_MIN_BUFFER_SIZE); | |
252 | ||
253 | return roundup_pow_of_two(n_events); | |
b58f7086 HR |
254 | } |
255 | ||
d0ffb9be | 256 | static int evdev_open(struct inode *inode, struct file *file) |
1da177e4 | 257 | { |
d0ffb9be | 258 | struct evdev *evdev; |
6addb1d6 | 259 | struct evdev_client *client; |
1da177e4 | 260 | int i = iminor(inode) - EVDEV_MINOR_BASE; |
b58f7086 | 261 | unsigned int bufsize; |
d542ed82 | 262 | int error; |
1da177e4 | 263 | |
d0ffb9be | 264 | if (i >= EVDEV_MINORS) |
1da177e4 LT |
265 | return -ENODEV; |
266 | ||
6addb1d6 DT |
267 | error = mutex_lock_interruptible(&evdev_table_mutex); |
268 | if (error) | |
269 | return error; | |
d0ffb9be | 270 | evdev = evdev_table[i]; |
6addb1d6 DT |
271 | if (evdev) |
272 | get_device(&evdev->dev); | |
273 | mutex_unlock(&evdev_table_mutex); | |
d0ffb9be | 274 | |
6addb1d6 | 275 | if (!evdev) |
1da177e4 LT |
276 | return -ENODEV; |
277 | ||
b58f7086 HR |
278 | bufsize = evdev_compute_buffer_size(evdev->handle.dev); |
279 | ||
280 | client = kzalloc(sizeof(struct evdev_client) + | |
281 | bufsize * sizeof(struct input_event), | |
282 | GFP_KERNEL); | |
9657d75c DT |
283 | if (!client) { |
284 | error = -ENOMEM; | |
285 | goto err_put_evdev; | |
286 | } | |
1da177e4 | 287 | |
b58f7086 | 288 | client->bufsize = bufsize; |
6addb1d6 | 289 | spin_lock_init(&client->buffer_lock); |
d0ffb9be | 290 | client->evdev = evdev; |
6addb1d6 | 291 | evdev_attach_client(evdev, client); |
1da177e4 | 292 | |
6addb1d6 DT |
293 | error = evdev_open_device(evdev); |
294 | if (error) | |
295 | goto err_free_client; | |
1da177e4 | 296 | |
d0ffb9be | 297 | file->private_data = client; |
3d7bbd45 DT |
298 | nonseekable_open(inode, file); |
299 | ||
1da177e4 | 300 | return 0; |
9657d75c DT |
301 | |
302 | err_free_client: | |
6addb1d6 | 303 | evdev_detach_client(evdev, client); |
9657d75c DT |
304 | kfree(client); |
305 | err_put_evdev: | |
306 | put_device(&evdev->dev); | |
307 | return error; | |
1da177e4 LT |
308 | } |
309 | ||
6addb1d6 DT |
310 | static ssize_t evdev_write(struct file *file, const char __user *buffer, |
311 | size_t count, loff_t *ppos) | |
3a51f7c4 | 312 | { |
d0ffb9be DT |
313 | struct evdev_client *client = file->private_data; |
314 | struct evdev *evdev = client->evdev; | |
3a51f7c4 | 315 | struct input_event event; |
6addb1d6 | 316 | int retval; |
52658bb6 | 317 | |
6addb1d6 DT |
318 | retval = mutex_lock_interruptible(&evdev->mutex); |
319 | if (retval) | |
320 | return retval; | |
321 | ||
322 | if (!evdev->exist) { | |
323 | retval = -ENODEV; | |
324 | goto out; | |
325 | } | |
52658bb6 | 326 | |
3a51f7c4 DT |
327 | while (retval < count) { |
328 | ||
2d56f3a3 | 329 | if (input_event_from_user(buffer + retval, &event)) { |
6addb1d6 DT |
330 | retval = -EFAULT; |
331 | goto out; | |
332 | } | |
333 | ||
334 | input_inject_event(&evdev->handle, | |
335 | event.type, event.code, event.value); | |
2d56f3a3 | 336 | retval += input_event_size(); |
52658bb6 JK |
337 | } |
338 | ||
6addb1d6 DT |
339 | out: |
340 | mutex_unlock(&evdev->mutex); | |
52658bb6 JK |
341 | return retval; |
342 | } | |
52658bb6 | 343 | |
6addb1d6 DT |
344 | static int evdev_fetch_next_event(struct evdev_client *client, |
345 | struct input_event *event) | |
346 | { | |
347 | int have_event; | |
348 | ||
349 | spin_lock_irq(&client->buffer_lock); | |
350 | ||
351 | have_event = client->head != client->tail; | |
352 | if (have_event) { | |
353 | *event = client->buffer[client->tail++]; | |
b58f7086 | 354 | client->tail &= client->bufsize - 1; |
6addb1d6 DT |
355 | } |
356 | ||
357 | spin_unlock_irq(&client->buffer_lock); | |
358 | ||
359 | return have_event; | |
360 | } | |
361 | ||
362 | static ssize_t evdev_read(struct file *file, char __user *buffer, | |
363 | size_t count, loff_t *ppos) | |
1da177e4 | 364 | { |
d0ffb9be DT |
365 | struct evdev_client *client = file->private_data; |
366 | struct evdev *evdev = client->evdev; | |
6addb1d6 | 367 | struct input_event event; |
1da177e4 LT |
368 | int retval; |
369 | ||
2d56f3a3 | 370 | if (count < input_event_size()) |
1da177e4 LT |
371 | return -EINVAL; |
372 | ||
6addb1d6 DT |
373 | if (client->head == client->tail && evdev->exist && |
374 | (file->f_flags & O_NONBLOCK)) | |
1da177e4 LT |
375 | return -EAGAIN; |
376 | ||
d0ffb9be DT |
377 | retval = wait_event_interruptible(evdev->wait, |
378 | client->head != client->tail || !evdev->exist); | |
1da177e4 LT |
379 | if (retval) |
380 | return retval; | |
381 | ||
d0ffb9be | 382 | if (!evdev->exist) |
1da177e4 LT |
383 | return -ENODEV; |
384 | ||
2d56f3a3 | 385 | while (retval + input_event_size() <= count && |
6addb1d6 | 386 | evdev_fetch_next_event(client, &event)) { |
3a51f7c4 | 387 | |
2d56f3a3 | 388 | if (input_event_to_user(buffer + retval, &event)) |
3a51f7c4 DT |
389 | return -EFAULT; |
390 | ||
2d56f3a3 | 391 | retval += input_event_size(); |
1da177e4 LT |
392 | } |
393 | ||
394 | return retval; | |
395 | } | |
396 | ||
397 | /* No kernel lock - fine */ | |
398 | static unsigned int evdev_poll(struct file *file, poll_table *wait) | |
399 | { | |
d0ffb9be DT |
400 | struct evdev_client *client = file->private_data; |
401 | struct evdev *evdev = client->evdev; | |
1e0afb28 | 402 | |
d0ffb9be DT |
403 | poll_wait(file, &evdev->wait, wait); |
404 | return ((client->head == client->tail) ? 0 : (POLLIN | POLLRDNORM)) | | |
405 | (evdev->exist ? 0 : (POLLHUP | POLLERR)); | |
1da177e4 LT |
406 | } |
407 | ||
3a51f7c4 DT |
408 | #ifdef CONFIG_COMPAT |
409 | ||
410 | #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) | |
7b19ada2 | 411 | #define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1) |
3a51f7c4 DT |
412 | |
413 | #ifdef __BIG_ENDIAN | |
414 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
415 | unsigned int maxlen, void __user *p, int compat) | |
416 | { | |
417 | int len, i; | |
418 | ||
419 | if (compat) { | |
7b19ada2 | 420 | len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t); |
bf61f8d3 | 421 | if (len > maxlen) |
3a51f7c4 DT |
422 | len = maxlen; |
423 | ||
424 | for (i = 0; i < len / sizeof(compat_long_t); i++) | |
425 | if (copy_to_user((compat_long_t __user *) p + i, | |
426 | (compat_long_t *) bits + | |
427 | i + 1 - ((i % 2) << 1), | |
428 | sizeof(compat_long_t))) | |
429 | return -EFAULT; | |
430 | } else { | |
7b19ada2 | 431 | len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
432 | if (len > maxlen) |
433 | len = maxlen; | |
434 | ||
435 | if (copy_to_user(p, bits, len)) | |
436 | return -EFAULT; | |
437 | } | |
438 | ||
439 | return len; | |
440 | } | |
441 | #else | |
442 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
443 | unsigned int maxlen, void __user *p, int compat) | |
444 | { | |
445 | int len = compat ? | |
7b19ada2 JS |
446 | BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) : |
447 | BITS_TO_LONGS(maxbit) * sizeof(long); | |
3a51f7c4 DT |
448 | |
449 | if (len > maxlen) | |
450 | len = maxlen; | |
451 | ||
452 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
453 | } | |
454 | #endif /* __BIG_ENDIAN */ | |
455 | ||
456 | #else | |
457 | ||
458 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
459 | unsigned int maxlen, void __user *p, int compat) | |
460 | { | |
7b19ada2 | 461 | int len = BITS_TO_LONGS(maxbit) * sizeof(long); |
3a51f7c4 DT |
462 | |
463 | if (len > maxlen) | |
464 | len = maxlen; | |
465 | ||
466 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
467 | } | |
468 | ||
469 | #endif /* CONFIG_COMPAT */ | |
470 | ||
471 | static int str_to_user(const char *str, unsigned int maxlen, void __user *p) | |
472 | { | |
473 | int len; | |
474 | ||
475 | if (!str) | |
476 | return -ENOENT; | |
477 | ||
478 | len = strlen(str) + 1; | |
479 | if (len > maxlen) | |
480 | len = maxlen; | |
481 | ||
482 | return copy_to_user(p, str, len) ? -EFAULT : len; | |
483 | } | |
484 | ||
f2afa771 | 485 | #define OLD_KEY_MAX 0x1ff |
5402a734 LT |
486 | static int handle_eviocgbit(struct input_dev *dev, unsigned int cmd, void __user *p, int compat_mode) |
487 | { | |
f2afa771 | 488 | static unsigned long keymax_warn_time; |
5402a734 LT |
489 | unsigned long *bits; |
490 | int len; | |
491 | ||
492 | switch (_IOC_NR(cmd) & EV_MAX) { | |
493 | ||
494 | case 0: bits = dev->evbit; len = EV_MAX; break; | |
495 | case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; | |
496 | case EV_REL: bits = dev->relbit; len = REL_MAX; break; | |
497 | case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; | |
498 | case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; | |
499 | case EV_LED: bits = dev->ledbit; len = LED_MAX; break; | |
500 | case EV_SND: bits = dev->sndbit; len = SND_MAX; break; | |
501 | case EV_FF: bits = dev->ffbit; len = FF_MAX; break; | |
502 | case EV_SW: bits = dev->swbit; len = SW_MAX; break; | |
503 | default: return -EINVAL; | |
504 | } | |
f2afa771 DT |
505 | |
506 | /* | |
507 | * Work around bugs in userspace programs that like to do | |
508 | * EVIOCGBIT(EV_KEY, KEY_MAX) and not realize that 'len' | |
509 | * should be in bytes, not in bits. | |
510 | */ | |
511 | if ((_IOC_NR(cmd) & EV_MAX) == EV_KEY && _IOC_SIZE(cmd) == OLD_KEY_MAX) { | |
512 | len = OLD_KEY_MAX; | |
513 | if (printk_timed_ratelimit(&keymax_warn_time, 10 * 1000)) | |
514 | printk(KERN_WARNING | |
c85e2031 GU |
515 | "evdev.c(EVIOCGBIT): Suspicious buffer size %u, " |
516 | "limiting output to %zu bytes. See " | |
f2afa771 DT |
517 | "http://userweb.kernel.org/~dtor/eviocgbit-bug.html\n", |
518 | OLD_KEY_MAX, | |
519 | BITS_TO_LONGS(OLD_KEY_MAX) * sizeof(long)); | |
520 | } | |
521 | ||
5402a734 LT |
522 | return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode); |
523 | } | |
f2afa771 | 524 | #undef OLD_KEY_MAX |
5402a734 | 525 | |
6addb1d6 DT |
526 | static long evdev_do_ioctl(struct file *file, unsigned int cmd, |
527 | void __user *p, int compat_mode) | |
1da177e4 | 528 | { |
d0ffb9be DT |
529 | struct evdev_client *client = file->private_data; |
530 | struct evdev *evdev = client->evdev; | |
1da177e4 LT |
531 | struct input_dev *dev = evdev->handle.dev; |
532 | struct input_absinfo abs; | |
509ca1a9 | 533 | struct ff_effect effect; |
3a51f7c4 | 534 | int __user *ip = (int __user *)p; |
58b93995 | 535 | unsigned int i, t, u, v; |
509ca1a9 | 536 | int error; |
1da177e4 | 537 | |
1da177e4 LT |
538 | switch (cmd) { |
539 | ||
6addb1d6 DT |
540 | case EVIOCGVERSION: |
541 | return put_user(EV_VERSION, ip); | |
1da177e4 | 542 | |
6addb1d6 DT |
543 | case EVIOCGID: |
544 | if (copy_to_user(p, &dev->id, sizeof(struct input_id))) | |
545 | return -EFAULT; | |
546 | return 0; | |
08791e5c | 547 | |
6addb1d6 DT |
548 | case EVIOCGREP: |
549 | if (!test_bit(EV_REP, dev->evbit)) | |
550 | return -ENOSYS; | |
551 | if (put_user(dev->rep[REP_DELAY], ip)) | |
552 | return -EFAULT; | |
553 | if (put_user(dev->rep[REP_PERIOD], ip + 1)) | |
554 | return -EFAULT; | |
555 | return 0; | |
08791e5c | 556 | |
6addb1d6 DT |
557 | case EVIOCSREP: |
558 | if (!test_bit(EV_REP, dev->evbit)) | |
559 | return -ENOSYS; | |
560 | if (get_user(u, ip)) | |
561 | return -EFAULT; | |
562 | if (get_user(v, ip + 1)) | |
563 | return -EFAULT; | |
08791e5c | 564 | |
6addb1d6 DT |
565 | input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u); |
566 | input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v); | |
3a51f7c4 | 567 | |
6addb1d6 | 568 | return 0; |
1da177e4 | 569 | |
6addb1d6 DT |
570 | case EVIOCGKEYCODE: |
571 | if (get_user(t, ip)) | |
572 | return -EFAULT; | |
c8e4c772 | 573 | |
f4f37c8e | 574 | error = input_get_keycode(dev, t, &v); |
6addb1d6 DT |
575 | if (error) |
576 | return error; | |
c8e4c772 | 577 | |
6addb1d6 DT |
578 | if (put_user(v, ip + 1)) |
579 | return -EFAULT; | |
c8e4c772 | 580 | |
6addb1d6 | 581 | return 0; |
1da177e4 | 582 | |
6addb1d6 DT |
583 | case EVIOCSKEYCODE: |
584 | if (get_user(t, ip) || get_user(v, ip + 1)) | |
585 | return -EFAULT; | |
3a51f7c4 | 586 | |
f4f37c8e | 587 | return input_set_keycode(dev, t, v); |
1da177e4 | 588 | |
6addb1d6 DT |
589 | case EVIOCRMFF: |
590 | return input_ff_erase(dev, (int)(unsigned long) p, file); | |
1da177e4 | 591 | |
6addb1d6 DT |
592 | case EVIOCGEFFECTS: |
593 | i = test_bit(EV_FF, dev->evbit) ? | |
594 | dev->ff->max_effects : 0; | |
595 | if (put_user(i, ip)) | |
596 | return -EFAULT; | |
597 | return 0; | |
598 | ||
599 | case EVIOCGRAB: | |
600 | if (p) | |
601 | return evdev_grab(evdev, client); | |
602 | else | |
603 | return evdev_ungrab(evdev, client); | |
1da177e4 | 604 | |
6addb1d6 | 605 | default: |
1da177e4 | 606 | |
6addb1d6 DT |
607 | if (_IOC_TYPE(cmd) != 'E') |
608 | return -EINVAL; | |
1da177e4 | 609 | |
6addb1d6 | 610 | if (_IOC_DIR(cmd) == _IOC_READ) { |
41e979f8 | 611 | |
5402a734 LT |
612 | if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0))) |
613 | return handle_eviocgbit(dev, cmd, p, compat_mode); | |
1da177e4 | 614 | |
6addb1d6 DT |
615 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) |
616 | return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd), | |
617 | p, compat_mode); | |
1da177e4 | 618 | |
6addb1d6 DT |
619 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) |
620 | return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd), | |
621 | p, compat_mode); | |
1da177e4 | 622 | |
6addb1d6 DT |
623 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) |
624 | return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd), | |
625 | p, compat_mode); | |
31581066 | 626 | |
6addb1d6 DT |
627 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0))) |
628 | return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd), | |
629 | p, compat_mode); | |
1da177e4 | 630 | |
6addb1d6 | 631 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) |
f9366014 | 632 | return str_to_user(dev->name, _IOC_SIZE(cmd), p); |
1da177e4 | 633 | |
6addb1d6 DT |
634 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) |
635 | return str_to_user(dev->phys, _IOC_SIZE(cmd), p); | |
1da177e4 | 636 | |
6addb1d6 DT |
637 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) |
638 | return str_to_user(dev->uniq, _IOC_SIZE(cmd), p); | |
1da177e4 | 639 | |
6addb1d6 | 640 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { |
1da177e4 | 641 | |
6addb1d6 | 642 | t = _IOC_NR(cmd) & ABS_MAX; |
1da177e4 | 643 | |
6addb1d6 DT |
644 | abs.value = dev->abs[t]; |
645 | abs.minimum = dev->absmin[t]; | |
646 | abs.maximum = dev->absmax[t]; | |
647 | abs.fuzz = dev->absfuzz[t]; | |
648 | abs.flat = dev->absflat[t]; | |
ec20a022 | 649 | abs.resolution = dev->absres[t]; |
41e979f8 | 650 | |
ec20a022 TS |
651 | if (copy_to_user(p, &abs, min_t(size_t, |
652 | _IOC_SIZE(cmd), | |
653 | sizeof(struct input_absinfo)))) | |
6addb1d6 | 654 | return -EFAULT; |
1da177e4 | 655 | |
6addb1d6 | 656 | return 0; |
1da177e4 LT |
657 | } |
658 | ||
6addb1d6 DT |
659 | } |
660 | ||
661 | if (_IOC_DIR(cmd) == _IOC_WRITE) { | |
1da177e4 | 662 | |
f2278f31 AD |
663 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCSFF)) { |
664 | ||
2d56f3a3 | 665 | if (input_ff_effect_from_user(p, _IOC_SIZE(cmd), &effect)) |
f2278f31 AD |
666 | return -EFAULT; |
667 | ||
668 | error = input_ff_upload(dev, &effect, file); | |
669 | ||
670 | if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) | |
671 | return -EFAULT; | |
672 | ||
673 | return error; | |
674 | } | |
675 | ||
6addb1d6 | 676 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { |
1da177e4 | 677 | |
6addb1d6 | 678 | t = _IOC_NR(cmd) & ABS_MAX; |
41e979f8 | 679 | |
ec20a022 TS |
680 | if (copy_from_user(&abs, p, min_t(size_t, |
681 | _IOC_SIZE(cmd), | |
682 | sizeof(struct input_absinfo)))) | |
6addb1d6 | 683 | return -EFAULT; |
1da177e4 | 684 | |
6addb1d6 DT |
685 | /* |
686 | * Take event lock to ensure that we are not | |
687 | * changing device parameters in the middle | |
688 | * of event. | |
689 | */ | |
690 | spin_lock_irq(&dev->event_lock); | |
1da177e4 | 691 | |
6addb1d6 DT |
692 | dev->abs[t] = abs.value; |
693 | dev->absmin[t] = abs.minimum; | |
694 | dev->absmax[t] = abs.maximum; | |
695 | dev->absfuzz[t] = abs.fuzz; | |
696 | dev->absflat[t] = abs.flat; | |
ec20a022 TS |
697 | dev->absres[t] = _IOC_SIZE(cmd) < sizeof(struct input_absinfo) ? |
698 | 0 : abs.resolution; | |
6addb1d6 DT |
699 | |
700 | spin_unlock_irq(&dev->event_lock); | |
701 | ||
702 | return 0; | |
1da177e4 | 703 | } |
6addb1d6 | 704 | } |
1da177e4 LT |
705 | } |
706 | return -EINVAL; | |
707 | } | |
1da177e4 | 708 | |
6addb1d6 DT |
709 | static long evdev_ioctl_handler(struct file *file, unsigned int cmd, |
710 | void __user *p, int compat_mode) | |
711 | { | |
712 | struct evdev_client *client = file->private_data; | |
713 | struct evdev *evdev = client->evdev; | |
714 | int retval; | |
715 | ||
716 | retval = mutex_lock_interruptible(&evdev->mutex); | |
717 | if (retval) | |
718 | return retval; | |
719 | ||
720 | if (!evdev->exist) { | |
721 | retval = -ENODEV; | |
722 | goto out; | |
723 | } | |
724 | ||
725 | retval = evdev_do_ioctl(file, cmd, p, compat_mode); | |
726 | ||
727 | out: | |
728 | mutex_unlock(&evdev->mutex); | |
729 | return retval; | |
730 | } | |
731 | ||
3a51f7c4 DT |
732 | static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
733 | { | |
734 | return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0); | |
735 | } | |
41e979f8 | 736 | |
3a51f7c4 | 737 | #ifdef CONFIG_COMPAT |
6addb1d6 DT |
738 | static long evdev_ioctl_compat(struct file *file, |
739 | unsigned int cmd, unsigned long arg) | |
52658bb6 | 740 | { |
3a51f7c4 | 741 | return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1); |
1da177e4 | 742 | } |
52658bb6 | 743 | #endif |
1da177e4 | 744 | |
66e66118 | 745 | static const struct file_operations evdev_fops = { |
6addb1d6 DT |
746 | .owner = THIS_MODULE, |
747 | .read = evdev_read, | |
748 | .write = evdev_write, | |
749 | .poll = evdev_poll, | |
750 | .open = evdev_open, | |
751 | .release = evdev_release, | |
752 | .unlocked_ioctl = evdev_ioctl, | |
52658bb6 | 753 | #ifdef CONFIG_COMPAT |
6addb1d6 | 754 | .compat_ioctl = evdev_ioctl_compat, |
52658bb6 | 755 | #endif |
6addb1d6 DT |
756 | .fasync = evdev_fasync, |
757 | .flush = evdev_flush | |
1da177e4 LT |
758 | }; |
759 | ||
6addb1d6 DT |
760 | static int evdev_install_chrdev(struct evdev *evdev) |
761 | { | |
762 | /* | |
763 | * No need to do any locking here as calls to connect and | |
764 | * disconnect are serialized by the input core | |
765 | */ | |
766 | evdev_table[evdev->minor] = evdev; | |
767 | return 0; | |
768 | } | |
769 | ||
770 | static void evdev_remove_chrdev(struct evdev *evdev) | |
771 | { | |
772 | /* | |
773 | * Lock evdev table to prevent race with evdev_open() | |
774 | */ | |
775 | mutex_lock(&evdev_table_mutex); | |
776 | evdev_table[evdev->minor] = NULL; | |
777 | mutex_unlock(&evdev_table_mutex); | |
778 | } | |
779 | ||
780 | /* | |
781 | * Mark device non-existent. This disables writes, ioctls and | |
782 | * prevents new users from opening the device. Already posted | |
783 | * blocking reads will stay, however new ones will fail. | |
784 | */ | |
785 | static void evdev_mark_dead(struct evdev *evdev) | |
786 | { | |
787 | mutex_lock(&evdev->mutex); | |
788 | evdev->exist = 0; | |
789 | mutex_unlock(&evdev->mutex); | |
790 | } | |
791 | ||
792 | static void evdev_cleanup(struct evdev *evdev) | |
793 | { | |
794 | struct input_handle *handle = &evdev->handle; | |
795 | ||
796 | evdev_mark_dead(evdev); | |
797 | evdev_hangup(evdev); | |
798 | evdev_remove_chrdev(evdev); | |
799 | ||
800 | /* evdev is marked dead so no one else accesses evdev->open */ | |
801 | if (evdev->open) { | |
802 | input_flush_device(handle, NULL); | |
803 | input_close_device(handle); | |
804 | } | |
805 | } | |
806 | ||
807 | /* | |
808 | * Create new evdev device. Note that input core serializes calls | |
809 | * to connect and disconnect so we don't need to lock evdev_table here. | |
810 | */ | |
5b2a0826 DT |
811 | static int evdev_connect(struct input_handler *handler, struct input_dev *dev, |
812 | const struct input_device_id *id) | |
1da177e4 LT |
813 | { |
814 | struct evdev *evdev; | |
815 | int minor; | |
5b2a0826 | 816 | int error; |
1da177e4 | 817 | |
6addb1d6 DT |
818 | for (minor = 0; minor < EVDEV_MINORS; minor++) |
819 | if (!evdev_table[minor]) | |
820 | break; | |
821 | ||
1da177e4 LT |
822 | if (minor == EVDEV_MINORS) { |
823 | printk(KERN_ERR "evdev: no more free evdev devices\n"); | |
5b2a0826 | 824 | return -ENFILE; |
1da177e4 LT |
825 | } |
826 | ||
5b2a0826 DT |
827 | evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL); |
828 | if (!evdev) | |
829 | return -ENOMEM; | |
1da177e4 | 830 | |
d0ffb9be | 831 | INIT_LIST_HEAD(&evdev->client_list); |
6addb1d6 DT |
832 | spin_lock_init(&evdev->client_lock); |
833 | mutex_init(&evdev->mutex); | |
1da177e4 LT |
834 | init_waitqueue_head(&evdev->wait); |
835 | ||
3d5cb60e | 836 | dev_set_name(&evdev->dev, "event%d", minor); |
1da177e4 LT |
837 | evdev->exist = 1; |
838 | evdev->minor = minor; | |
6addb1d6 | 839 | |
a7097ff8 | 840 | evdev->handle.dev = input_get_device(dev); |
3d5cb60e | 841 | evdev->handle.name = dev_name(&evdev->dev); |
1da177e4 LT |
842 | evdev->handle.handler = handler; |
843 | evdev->handle.private = evdev; | |
1da177e4 | 844 | |
6addb1d6 | 845 | evdev->dev.devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor); |
9657d75c DT |
846 | evdev->dev.class = &input_class; |
847 | evdev->dev.parent = &dev->dev; | |
9657d75c DT |
848 | evdev->dev.release = evdev_free; |
849 | device_initialize(&evdev->dev); | |
5b2a0826 | 850 | |
6addb1d6 | 851 | error = input_register_handle(&evdev->handle); |
5b2a0826 | 852 | if (error) |
9657d75c | 853 | goto err_free_evdev; |
5b2a0826 | 854 | |
6addb1d6 DT |
855 | error = evdev_install_chrdev(evdev); |
856 | if (error) | |
857 | goto err_unregister_handle; | |
858 | ||
859 | error = device_add(&evdev->dev); | |
5b2a0826 | 860 | if (error) |
6addb1d6 | 861 | goto err_cleanup_evdev; |
1da177e4 | 862 | |
5b2a0826 | 863 | return 0; |
1da177e4 | 864 | |
6addb1d6 DT |
865 | err_cleanup_evdev: |
866 | evdev_cleanup(evdev); | |
867 | err_unregister_handle: | |
868 | input_unregister_handle(&evdev->handle); | |
5b2a0826 | 869 | err_free_evdev: |
9657d75c | 870 | put_device(&evdev->dev); |
5b2a0826 | 871 | return error; |
1da177e4 LT |
872 | } |
873 | ||
874 | static void evdev_disconnect(struct input_handle *handle) | |
875 | { | |
876 | struct evdev *evdev = handle->private; | |
1da177e4 | 877 | |
9657d75c | 878 | device_del(&evdev->dev); |
6addb1d6 DT |
879 | evdev_cleanup(evdev); |
880 | input_unregister_handle(handle); | |
9657d75c | 881 | put_device(&evdev->dev); |
1da177e4 LT |
882 | } |
883 | ||
66e66118 | 884 | static const struct input_device_id evdev_ids[] = { |
1da177e4 LT |
885 | { .driver_info = 1 }, /* Matches all devices */ |
886 | { }, /* Terminating zero entry */ | |
887 | }; | |
888 | ||
889 | MODULE_DEVICE_TABLE(input, evdev_ids); | |
890 | ||
891 | static struct input_handler evdev_handler = { | |
6addb1d6 DT |
892 | .event = evdev_event, |
893 | .connect = evdev_connect, | |
894 | .disconnect = evdev_disconnect, | |
895 | .fops = &evdev_fops, | |
896 | .minor = EVDEV_MINOR_BASE, | |
897 | .name = "evdev", | |
898 | .id_table = evdev_ids, | |
1da177e4 LT |
899 | }; |
900 | ||
901 | static int __init evdev_init(void) | |
902 | { | |
4263cf0f | 903 | return input_register_handler(&evdev_handler); |
1da177e4 LT |
904 | } |
905 | ||
906 | static void __exit evdev_exit(void) | |
907 | { | |
908 | input_unregister_handler(&evdev_handler); | |
909 | } | |
910 | ||
911 | module_init(evdev_init); | |
912 | module_exit(evdev_exit); | |
913 | ||
914 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
915 | MODULE_DESCRIPTION("Input driver event char devices"); | |
916 | MODULE_LICENSE("GPL"); |