blob: 6439f378f6cc9562f23ec5f8ee331f57bd898f45 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
21#include <linux/smp_lock.h>
22#include <linux/device.h>
Juergen Kreileder52658bb2005-05-29 02:26:43 -050023#include <linux/compat.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
25struct evdev {
26 int exist;
27 int open;
28 int minor;
29 char name[16];
30 struct input_handle handle;
31 wait_queue_head_t wait;
32 struct evdev_list *grab;
33 struct list_head list;
34};
35
36struct evdev_list {
37 struct input_event buffer[EVDEV_BUFFER_SIZE];
38 int head;
39 int tail;
40 struct fasync_struct *fasync;
41 struct evdev *evdev;
42 struct list_head node;
43};
44
45static struct evdev *evdev_table[EVDEV_MINORS];
46
47static void evdev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
48{
49 struct evdev *evdev = handle->private;
50 struct evdev_list *list;
51
52 if (evdev->grab) {
53 list = evdev->grab;
54
55 do_gettimeofday(&list->buffer[list->head].time);
56 list->buffer[list->head].type = type;
57 list->buffer[list->head].code = code;
58 list->buffer[list->head].value = value;
59 list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1);
60
61 kill_fasync(&list->fasync, SIGIO, POLL_IN);
62 } else
63 list_for_each_entry(list, &evdev->list, node) {
64
65 do_gettimeofday(&list->buffer[list->head].time);
66 list->buffer[list->head].type = type;
67 list->buffer[list->head].code = code;
68 list->buffer[list->head].value = value;
69 list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1);
70
71 kill_fasync(&list->fasync, SIGIO, POLL_IN);
72 }
73
74 wake_up_interruptible(&evdev->wait);
75}
76
77static int evdev_fasync(int fd, struct file *file, int on)
78{
79 int retval;
80 struct evdev_list *list = file->private_data;
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -040081
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 retval = fasync_helper(fd, file, on, &list->fasync);
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -040083
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 return retval < 0 ? retval : 0;
85}
86
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -040087static int evdev_flush(struct file *file, fl_owner_t id)
Linus Torvalds1da177e2005-04-16 15:20:36 -070088{
89 struct evdev_list *list = file->private_data;
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -040090
91 if (!list->evdev->exist)
92 return -ENODEV;
93
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 return input_flush_device(&list->evdev->handle, file);
95}
96
97static void evdev_free(struct evdev *evdev)
98{
99 evdev_table[evdev->minor] = NULL;
100 kfree(evdev);
101}
102
103static int evdev_release(struct inode * inode, struct file * file)
104{
105 struct evdev_list *list = file->private_data;
106
107 if (list->evdev->grab == list) {
108 input_release_device(&list->evdev->handle);
109 list->evdev->grab = NULL;
110 }
111
112 evdev_fasync(-1, file, 0);
113 list_del(&list->node);
114
115 if (!--list->evdev->open) {
116 if (list->evdev->exist)
117 input_close_device(&list->evdev->handle);
118 else
119 evdev_free(list->evdev);
120 }
121
122 kfree(list);
123 return 0;
124}
125
126static int evdev_open(struct inode * inode, struct file * file)
127{
128 struct evdev_list *list;
129 int i = iminor(inode) - EVDEV_MINOR_BASE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
131 if (i >= EVDEV_MINORS || !evdev_table[i] || !evdev_table[i]->exist)
132 return -ENODEV;
133
Eric Sesterhennb39787a2006-03-14 00:09:16 -0500134 if (!(list = kzalloc(sizeof(struct evdev_list), GFP_KERNEL)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
137 list->evdev = evdev_table[i];
138 list_add_tail(&list->node, &evdev_table[i]->list);
139 file->private_data = list;
140
141 if (!list->evdev->open++)
142 if (list->evdev->exist)
143 input_open_device(&list->evdev->handle);
144
145 return 0;
146}
147
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500148#ifdef CONFIG_COMPAT
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500149
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500150struct input_event_compat {
151 struct compat_timeval time;
152 __u16 type;
153 __u16 code;
154 __s32 value;
155};
156
Andi Kleenbf2fcc62006-01-11 22:44:06 +0100157/* Note to the author of this code: did it ever occur to
158 you why the ifdefs are needed? Think about it again. -AK */
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500159#ifdef CONFIG_X86_64
Andi Kleenbf2fcc62006-01-11 22:44:06 +0100160# define COMPAT_TEST is_compat_task()
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500161#elif defined(CONFIG_IA64)
Al Viro64505782006-01-12 01:06:06 -0800162# define COMPAT_TEST IS_IA32_PROCESS(task_pt_regs(current))
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800163#elif defined(CONFIG_S390)
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500164# define COMPAT_TEST test_thread_flag(TIF_31BIT)
Ralf Baechle59df6bb2005-09-03 15:56:23 -0700165#elif defined(CONFIG_MIPS)
166# define COMPAT_TEST (current->thread.mflags & MF_32BIT_ADDR)
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500167#else
168# define COMPAT_TEST test_thread_flag(TIF_32BIT)
169#endif
170
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500171static inline size_t evdev_event_size(void)
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500172{
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500173 return COMPAT_TEST ?
174 sizeof(struct input_event_compat) : sizeof(struct input_event);
175}
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500176
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500177static int evdev_event_from_user(const char __user *buffer, struct input_event *event)
178{
179 if (COMPAT_TEST) {
180 struct input_event_compat compat_event;
181
182 if (copy_from_user(&compat_event, buffer, sizeof(struct input_event_compat)))
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500183 return -EFAULT;
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500184
185 event->time.tv_sec = compat_event.time.tv_sec;
186 event->time.tv_usec = compat_event.time.tv_usec;
187 event->type = compat_event.type;
188 event->code = compat_event.code;
189 event->value = compat_event.value;
190
191 } else {
192 if (copy_from_user(event, buffer, sizeof(struct input_event)))
193 return -EFAULT;
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500194 }
195
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500196 return 0;
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500197}
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500198
199static int evdev_event_to_user(char __user *buffer, const struct input_event *event)
200{
201 if (COMPAT_TEST) {
202 struct input_event_compat compat_event;
203
204 compat_event.time.tv_sec = event->time.tv_sec;
205 compat_event.time.tv_usec = event->time.tv_usec;
206 compat_event.type = event->type;
207 compat_event.code = event->code;
208 compat_event.value = event->value;
209
210 if (copy_to_user(buffer, &compat_event, sizeof(struct input_event_compat)))
211 return -EFAULT;
212
213 } else {
214 if (copy_to_user(buffer, event, sizeof(struct input_event)))
215 return -EFAULT;
216 }
217
218 return 0;
219}
220
221#else
222
223static inline size_t evdev_event_size(void)
224{
225 return sizeof(struct input_event);
226}
227
228static int evdev_event_from_user(const char __user *buffer, struct input_event *event)
229{
230 if (copy_from_user(event, buffer, sizeof(struct input_event)))
231 return -EFAULT;
232
233 return 0;
234}
235
236static int evdev_event_to_user(char __user *buffer, const struct input_event *event)
237{
238 if (copy_to_user(buffer, event, sizeof(struct input_event)))
239 return -EFAULT;
240
241 return 0;
242}
243
244#endif /* CONFIG_COMPAT */
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500245
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246static ssize_t evdev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
247{
248 struct evdev_list *list = file->private_data;
249 struct input_event event;
250 int retval = 0;
251
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500252 if (!list->evdev->exist)
253 return -ENODEV;
254
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500255 while (retval < count) {
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500256
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500257 if (evdev_event_from_user(buffer + retval, &event))
258 return -EFAULT;
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400259 input_inject_event(&list->evdev->handle, event.type, event.code, event.value);
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500260 retval += evdev_event_size();
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500261 }
262
263 return retval;
264}
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500265
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
267{
268 struct evdev_list *list = file->private_data;
269 int retval;
270
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500271 if (count < evdev_event_size())
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 return -EINVAL;
273
274 if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK))
275 return -EAGAIN;
276
277 retval = wait_event_interruptible(list->evdev->wait,
278 list->head != list->tail || (!list->evdev->exist));
279
280 if (retval)
281 return retval;
282
283 if (!list->evdev->exist)
284 return -ENODEV;
285
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500286 while (list->head != list->tail && retval + evdev_event_size() <= count) {
287
288 struct input_event *event = (struct input_event *) list->buffer + list->tail;
289
290 if (evdev_event_to_user(buffer + retval, event))
291 return -EFAULT;
292
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500294 retval += evdev_event_size();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 }
296
297 return retval;
298}
299
300/* No kernel lock - fine */
301static unsigned int evdev_poll(struct file *file, poll_table *wait)
302{
303 struct evdev_list *list = file->private_data;
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400304
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 poll_wait(file, &list->evdev->wait, wait);
306 return ((list->head == list->tail) ? 0 : (POLLIN | POLLRDNORM)) |
307 (list->evdev->exist ? 0 : (POLLHUP | POLLERR));
308}
309
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500310#ifdef CONFIG_COMPAT
311
312#define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
313#define NBITS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1)
314
315#ifdef __BIG_ENDIAN
316static int bits_to_user(unsigned long *bits, unsigned int maxbit,
317 unsigned int maxlen, void __user *p, int compat)
318{
319 int len, i;
320
321 if (compat) {
322 len = NBITS_COMPAT(maxbit) * sizeof(compat_long_t);
323 if (len < maxlen)
324 len = maxlen;
325
326 for (i = 0; i < len / sizeof(compat_long_t); i++)
327 if (copy_to_user((compat_long_t __user *) p + i,
328 (compat_long_t *) bits +
329 i + 1 - ((i % 2) << 1),
330 sizeof(compat_long_t)))
331 return -EFAULT;
332 } else {
333 len = NBITS(maxbit) * sizeof(long);
334 if (len > maxlen)
335 len = maxlen;
336
337 if (copy_to_user(p, bits, len))
338 return -EFAULT;
339 }
340
341 return len;
342}
343#else
344static int bits_to_user(unsigned long *bits, unsigned int maxbit,
345 unsigned int maxlen, void __user *p, int compat)
346{
347 int len = compat ?
348 NBITS_COMPAT(maxbit) * sizeof(compat_long_t) :
349 NBITS(maxbit) * sizeof(long);
350
351 if (len > maxlen)
352 len = maxlen;
353
354 return copy_to_user(p, bits, len) ? -EFAULT : len;
355}
356#endif /* __BIG_ENDIAN */
357
358#else
359
360static int bits_to_user(unsigned long *bits, unsigned int maxbit,
361 unsigned int maxlen, void __user *p, int compat)
362{
363 int len = NBITS(maxbit) * sizeof(long);
364
365 if (len > maxlen)
366 len = maxlen;
367
368 return copy_to_user(p, bits, len) ? -EFAULT : len;
369}
370
371#endif /* CONFIG_COMPAT */
372
373static int str_to_user(const char *str, unsigned int maxlen, void __user *p)
374{
375 int len;
376
377 if (!str)
378 return -ENOENT;
379
380 len = strlen(str) + 1;
381 if (len > maxlen)
382 len = maxlen;
383
384 return copy_to_user(p, str, len) ? -EFAULT : len;
385}
386
387static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
388 void __user *p, int compat_mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389{
390 struct evdev_list *list = file->private_data;
391 struct evdev *evdev = list->evdev;
392 struct input_dev *dev = evdev->handle.dev;
393 struct input_absinfo abs;
Anssi Hannula509ca1a2006-07-19 01:40:22 -0400394 struct ff_effect effect;
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500395 int __user *ip = (int __user *)p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 int i, t, u, v;
Anssi Hannula509ca1a2006-07-19 01:40:22 -0400397 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500399 if (!evdev->exist)
400 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
402 switch (cmd) {
403
404 case EVIOCGVERSION:
405 return put_user(EV_VERSION, ip);
406
407 case EVIOCGID:
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500408 if (copy_to_user(p, &dev->id, sizeof(struct input_id)))
409 return -EFAULT;
Dmitry Torokhov08791e52006-04-29 01:13:21 -0400410 return 0;
411
412 case EVIOCGREP:
413 if (!test_bit(EV_REP, dev->evbit))
414 return -ENOSYS;
415 if (put_user(dev->rep[REP_DELAY], ip))
416 return -EFAULT;
417 if (put_user(dev->rep[REP_PERIOD], ip + 1))
418 return -EFAULT;
419 return 0;
420
421 case EVIOCSREP:
422 if (!test_bit(EV_REP, dev->evbit))
423 return -ENOSYS;
424 if (get_user(u, ip))
425 return -EFAULT;
426 if (get_user(v, ip + 1))
427 return -EFAULT;
428
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400429 input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u);
430 input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v);
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500431
432 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433
434 case EVIOCGKEYCODE:
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500435 if (get_user(t, ip))
436 return -EFAULT;
437 if (t < 0 || t >= dev->keycodemax || !dev->keycodesize)
438 return -EINVAL;
439 if (put_user(INPUT_KEYCODE(dev, t), ip + 1))
440 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 return 0;
442
443 case EVIOCSKEYCODE:
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500444 if (get_user(t, ip))
445 return -EFAULT;
446 if (t < 0 || t >= dev->keycodemax || !dev->keycodesize)
447 return -EINVAL;
448 if (get_user(v, ip + 1))
449 return -EFAULT;
450 if (v < 0 || v > KEY_MAX)
451 return -EINVAL;
452 if (dev->keycodesize < sizeof(v) && (v >> (dev->keycodesize * 8)))
453 return -EINVAL;
454
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 u = SET_INPUT_KEYCODE(dev, t, v);
456 clear_bit(u, dev->keybit);
457 set_bit(v, dev->keybit);
458 for (i = 0; i < dev->keycodemax; i++)
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500459 if (INPUT_KEYCODE(dev, i) == u)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 set_bit(u, dev->keybit);
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500461
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 return 0;
463
464 case EVIOCSFF:
Anssi Hannula509ca1a2006-07-19 01:40:22 -0400465 if (copy_from_user(&effect, p, sizeof(effect)))
466 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467
Anssi Hannula509ca1a2006-07-19 01:40:22 -0400468 error = input_ff_upload(dev, &effect, file);
469
470 if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
471 return -EFAULT;
472
473 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474
475 case EVIOCRMFF:
Anssi Hannula509ca1a2006-07-19 01:40:22 -0400476 return input_ff_erase(dev, (int)(unsigned long) p, file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477
478 case EVIOCGEFFECTS:
Anssi Hannula509ca1a2006-07-19 01:40:22 -0400479 i = test_bit(EV_FF, dev->evbit) ? dev->ff->max_effects : 0;
480 if (put_user(i, ip))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 return -EFAULT;
482 return 0;
483
484 case EVIOCGRAB:
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500485 if (p) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 if (evdev->grab)
487 return -EBUSY;
488 if (input_grab_device(&evdev->handle))
489 return -EBUSY;
490 evdev->grab = list;
491 return 0;
492 } else {
493 if (evdev->grab != list)
494 return -EINVAL;
495 input_release_device(&evdev->handle);
496 evdev->grab = NULL;
497 return 0;
498 }
499
500 default:
501
Vojtech Pavlik41e979f2005-05-29 02:30:15 -0500502 if (_IOC_TYPE(cmd) != 'E')
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 return -EINVAL;
504
Vojtech Pavlik41e979f2005-05-29 02:30:15 -0500505 if (_IOC_DIR(cmd) == _IOC_READ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506
Vojtech Pavlik41e979f2005-05-29 02:30:15 -0500507 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508
Vojtech Pavlik41e979f2005-05-29 02:30:15 -0500509 long *bits;
510 int len;
511
512 switch (_IOC_NR(cmd) & EV_MAX) {
513 case 0: bits = dev->evbit; len = EV_MAX; break;
514 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
515 case EV_REL: bits = dev->relbit; len = REL_MAX; break;
516 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
517 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
518 case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
519 case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
520 case EV_FF: bits = dev->ffbit; len = FF_MAX; break;
Richard Purdie31581062005-09-06 15:19:06 -0700521 case EV_SW: bits = dev->swbit; len = SW_MAX; break;
Vojtech Pavlik41e979f2005-05-29 02:30:15 -0500522 default: return -EINVAL;
523 }
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500524 return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 }
Vojtech Pavlik41e979f2005-05-29 02:30:15 -0500526
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500527 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0)))
528 return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd),
529 p, compat_mode);
Vojtech Pavlik41e979f2005-05-29 02:30:15 -0500530
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500531 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0)))
532 return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd),
533 p, compat_mode);
Vojtech Pavlik41e979f2005-05-29 02:30:15 -0500534
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500535 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0)))
536 return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd),
537 p, compat_mode);
Vojtech Pavlik41e979f2005-05-29 02:30:15 -0500538
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500539 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0)))
540 return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd),
541 p, compat_mode);
Richard Purdie31581062005-09-06 15:19:06 -0700542
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500543 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0)))
544 return str_to_user(dev->name, _IOC_SIZE(cmd), p);
Vojtech Pavlik41e979f2005-05-29 02:30:15 -0500545
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500546 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0)))
547 return str_to_user(dev->phys, _IOC_SIZE(cmd), p);
Vojtech Pavlik41e979f2005-05-29 02:30:15 -0500548
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500549 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0)))
550 return str_to_user(dev->uniq, _IOC_SIZE(cmd), p);
Vojtech Pavlik41e979f2005-05-29 02:30:15 -0500551
552 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
553
554 int t = _IOC_NR(cmd) & ABS_MAX;
555
556 abs.value = dev->abs[t];
557 abs.minimum = dev->absmin[t];
558 abs.maximum = dev->absmax[t];
559 abs.fuzz = dev->absfuzz[t];
560 abs.flat = dev->absflat[t];
561
562 if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
563 return -EFAULT;
564
565 return 0;
566 }
567
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 }
569
Vojtech Pavlik41e979f2005-05-29 02:30:15 -0500570 if (_IOC_DIR(cmd) == _IOC_WRITE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571
Vojtech Pavlik41e979f2005-05-29 02:30:15 -0500572 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573
Vojtech Pavlik41e979f2005-05-29 02:30:15 -0500574 int t = _IOC_NR(cmd) & ABS_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575
Vojtech Pavlik41e979f2005-05-29 02:30:15 -0500576 if (copy_from_user(&abs, p, sizeof(struct input_absinfo)))
577 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578
Vojtech Pavlik41e979f2005-05-29 02:30:15 -0500579 dev->abs[t] = abs.value;
580 dev->absmin[t] = abs.minimum;
581 dev->absmax[t] = abs.maximum;
582 dev->absfuzz[t] = abs.fuzz;
583 dev->absflat[t] = abs.flat;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584
Vojtech Pavlik41e979f2005-05-29 02:30:15 -0500585 return 0;
586 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 }
588 }
589 return -EINVAL;
590}
591
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500592static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
593{
594 return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);
595}
596
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500597#ifdef CONFIG_COMPAT
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500598static long evdev_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
599{
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500600 return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1);
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500601}
602#endif
603
Dmitry Torokhov66e66112006-09-14 01:31:59 -0400604static const struct file_operations evdev_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 .owner = THIS_MODULE,
606 .read = evdev_read,
607 .write = evdev_write,
608 .poll = evdev_poll,
609 .open = evdev_open,
610 .release = evdev_release,
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500611 .unlocked_ioctl = evdev_ioctl,
612#ifdef CONFIG_COMPAT
613 .compat_ioctl = evdev_ioctl_compat,
614#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 .fasync = evdev_fasync,
616 .flush = evdev_flush
617};
618
Dmitry Torokhov66e66112006-09-14 01:31:59 -0400619static struct input_handle *evdev_connect(struct input_handler *handler, struct input_dev *dev,
620 const struct input_device_id *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621{
622 struct evdev *evdev;
Greg Kroah-Hartmanc9bcd582005-10-27 22:25:43 -0700623 struct class_device *cdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 int minor;
625
626 for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++);
627 if (minor == EVDEV_MINORS) {
628 printk(KERN_ERR "evdev: no more free evdev devices\n");
629 return NULL;
630 }
631
Eric Sesterhennb39787a2006-03-14 00:09:16 -0500632 if (!(evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634
635 INIT_LIST_HEAD(&evdev->list);
636 init_waitqueue_head(&evdev->wait);
637
638 evdev->exist = 1;
639 evdev->minor = minor;
640 evdev->handle.dev = dev;
641 evdev->handle.name = evdev->name;
642 evdev->handle.handler = handler;
643 evdev->handle.private = evdev;
644 sprintf(evdev->name, "event%d", minor);
645
646 evdev_table[minor] = evdev;
647
Greg Kroah-Hartmanc9bcd582005-10-27 22:25:43 -0700648 cdev = class_device_create(&input_class, &dev->cdev,
gregkh@suse.de12356862005-03-15 14:26:30 -0800649 MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
Greg Kroah-Hartmanc9bcd582005-10-27 22:25:43 -0700650 dev->cdev.dev, evdev->name);
651
652 /* temporary symlink to keep userspace happy */
653 sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj,
654 evdev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655
656 return &evdev->handle;
657}
658
659static void evdev_disconnect(struct input_handle *handle)
660{
661 struct evdev *evdev = handle->private;
662 struct evdev_list *list;
663
Greg Kroah-Hartmanc9bcd582005-10-27 22:25:43 -0700664 sysfs_remove_link(&input_class.subsys.kset.kobj, evdev->name);
Greg Kroah-Hartmanea9f2402005-10-27 22:25:43 -0700665 class_device_destroy(&input_class,
gregkh@suse.de12356862005-03-15 14:26:30 -0800666 MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + evdev->minor));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 evdev->exist = 0;
668
669 if (evdev->open) {
Anssi Hannula509ca1a2006-07-19 01:40:22 -0400670 input_flush_device(handle, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 input_close_device(handle);
672 wake_up_interruptible(&evdev->wait);
673 list_for_each_entry(list, &evdev->list, node)
674 kill_fasync(&list->fasync, SIGIO, POLL_HUP);
675 } else
676 evdev_free(evdev);
677}
678
Dmitry Torokhov66e66112006-09-14 01:31:59 -0400679static const struct input_device_id evdev_ids[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680 { .driver_info = 1 }, /* Matches all devices */
681 { }, /* Terminating zero entry */
682};
683
684MODULE_DEVICE_TABLE(input, evdev_ids);
685
686static struct input_handler evdev_handler = {
687 .event = evdev_event,
688 .connect = evdev_connect,
689 .disconnect = evdev_disconnect,
690 .fops = &evdev_fops,
691 .minor = EVDEV_MINOR_BASE,
692 .name = "evdev",
693 .id_table = evdev_ids,
694};
695
696static int __init evdev_init(void)
697{
Dmitry Torokhov4263cf02006-09-14 01:32:39 -0400698 return input_register_handler(&evdev_handler);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699}
700
701static void __exit evdev_exit(void)
702{
703 input_unregister_handler(&evdev_handler);
704}
705
706module_init(evdev_init);
707module_exit(evdev_exit);
708
709MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
710MODULE_DESCRIPTION("Input driver event char devices");
711MODULE_LICENSE("GPL");