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Merge 'upstream' branch of rsync://rsync.kernel.org/pub/scm/linux/kernel/git/jgarzik...
[deliverable/linux.git] / drivers / input / evdev.c
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>
21 #include <linux/smp_lock.h>
22 #include <linux/device.h>
23 #include <linux/devfs_fs_kernel.h>
24 #include <linux/compat.h>
25
26 struct evdev {
27 int exist;
28 int open;
29 int minor;
30 char name[16];
31 struct input_handle handle;
32 wait_queue_head_t wait;
33 struct evdev_list *grab;
34 struct list_head list;
35 };
36
37 struct evdev_list {
38 struct input_event buffer[EVDEV_BUFFER_SIZE];
39 int head;
40 int tail;
41 struct fasync_struct *fasync;
42 struct evdev *evdev;
43 struct list_head node;
44 };
45
46 static struct evdev *evdev_table[EVDEV_MINORS];
47
48 static void evdev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
49 {
50 struct evdev *evdev = handle->private;
51 struct evdev_list *list;
52
53 if (evdev->grab) {
54 list = evdev->grab;
55
56 do_gettimeofday(&list->buffer[list->head].time);
57 list->buffer[list->head].type = type;
58 list->buffer[list->head].code = code;
59 list->buffer[list->head].value = value;
60 list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1);
61
62 kill_fasync(&list->fasync, SIGIO, POLL_IN);
63 } else
64 list_for_each_entry(list, &evdev->list, node) {
65
66 do_gettimeofday(&list->buffer[list->head].time);
67 list->buffer[list->head].type = type;
68 list->buffer[list->head].code = code;
69 list->buffer[list->head].value = value;
70 list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1);
71
72 kill_fasync(&list->fasync, SIGIO, POLL_IN);
73 }
74
75 wake_up_interruptible(&evdev->wait);
76 }
77
78 static int evdev_fasync(int fd, struct file *file, int on)
79 {
80 int retval;
81 struct evdev_list *list = file->private_data;
82 retval = fasync_helper(fd, file, on, &list->fasync);
83 return retval < 0 ? retval : 0;
84 }
85
86 static int evdev_flush(struct file * file)
87 {
88 struct evdev_list *list = file->private_data;
89 if (!list->evdev->exist) return -ENODEV;
90 return input_flush_device(&list->evdev->handle, file);
91 }
92
93 static void evdev_free(struct evdev *evdev)
94 {
95 evdev_table[evdev->minor] = NULL;
96 kfree(evdev);
97 }
98
99 static int evdev_release(struct inode * inode, struct file * file)
100 {
101 struct evdev_list *list = file->private_data;
102
103 if (list->evdev->grab == list) {
104 input_release_device(&list->evdev->handle);
105 list->evdev->grab = NULL;
106 }
107
108 evdev_fasync(-1, file, 0);
109 list_del(&list->node);
110
111 if (!--list->evdev->open) {
112 if (list->evdev->exist)
113 input_close_device(&list->evdev->handle);
114 else
115 evdev_free(list->evdev);
116 }
117
118 kfree(list);
119 return 0;
120 }
121
122 static int evdev_open(struct inode * inode, struct file * file)
123 {
124 struct evdev_list *list;
125 int i = iminor(inode) - EVDEV_MINOR_BASE;
126 int accept_err;
127
128 if (i >= EVDEV_MINORS || !evdev_table[i] || !evdev_table[i]->exist)
129 return -ENODEV;
130
131 if ((accept_err = input_accept_process(&(evdev_table[i]->handle), file)))
132 return accept_err;
133
134 if (!(list = kmalloc(sizeof(struct evdev_list), GFP_KERNEL)))
135 return -ENOMEM;
136 memset(list, 0, sizeof(struct evdev_list));
137
138 list->evdev = evdev_table[i];
139 list_add_tail(&list->node, &evdev_table[i]->list);
140 file->private_data = list;
141
142 if (!list->evdev->open++)
143 if (list->evdev->exist)
144 input_open_device(&list->evdev->handle);
145
146 return 0;
147 }
148
149 #ifdef CONFIG_COMPAT
150 struct input_event_compat {
151 struct compat_timeval time;
152 __u16 type;
153 __u16 code;
154 __s32 value;
155 };
156
157 #ifdef CONFIG_X86_64
158 # define COMPAT_TEST test_thread_flag(TIF_IA32)
159 #elif defined(CONFIG_IA64)
160 # define COMPAT_TEST IS_IA32_PROCESS(ia64_task_regs(current))
161 #elif defined(CONFIG_ARCH_S390)
162 # define COMPAT_TEST test_thread_flag(TIF_31BIT)
163 #else
164 # define COMPAT_TEST test_thread_flag(TIF_32BIT)
165 #endif
166
167 static ssize_t evdev_write_compat(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
168 {
169 struct evdev_list *list = file->private_data;
170 struct input_event_compat event;
171 int retval = 0;
172
173 while (retval < count) {
174 if (copy_from_user(&event, buffer + retval, sizeof(struct input_event_compat)))
175 return -EFAULT;
176 input_event(list->evdev->handle.dev, event.type, event.code, event.value);
177 retval += sizeof(struct input_event_compat);
178 }
179
180 return retval;
181 }
182 #endif
183
184 static ssize_t evdev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
185 {
186 struct evdev_list *list = file->private_data;
187 struct input_event event;
188 int retval = 0;
189
190 if (!list->evdev->exist) return -ENODEV;
191
192 #ifdef CONFIG_COMPAT
193 if (COMPAT_TEST)
194 return evdev_write_compat(file, buffer, count, ppos);
195 #endif
196
197 while (retval < count) {
198
199 if (copy_from_user(&event, buffer + retval, sizeof(struct input_event)))
200 return -EFAULT;
201 input_event(list->evdev->handle.dev, event.type, event.code, event.value);
202 retval += sizeof(struct input_event);
203 }
204
205 return retval;
206 }
207
208 #ifdef CONFIG_COMPAT
209 static ssize_t evdev_read_compat(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
210 {
211 struct evdev_list *list = file->private_data;
212 int retval;
213
214 if (count < sizeof(struct input_event_compat))
215 return -EINVAL;
216
217 if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK))
218 return -EAGAIN;
219
220 retval = wait_event_interruptible(list->evdev->wait,
221 list->head != list->tail || (!list->evdev->exist));
222
223 if (retval)
224 return retval;
225
226 if (!list->evdev->exist)
227 return -ENODEV;
228
229 while (list->head != list->tail && retval + sizeof(struct input_event_compat) <= count) {
230 struct input_event *event = (struct input_event *) list->buffer + list->tail;
231 struct input_event_compat event_compat;
232 event_compat.time.tv_sec = event->time.tv_sec;
233 event_compat.time.tv_usec = event->time.tv_usec;
234 event_compat.type = event->type;
235 event_compat.code = event->code;
236 event_compat.value = event->value;
237
238 if (copy_to_user(buffer + retval, &event_compat,
239 sizeof(struct input_event_compat))) return -EFAULT;
240 list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
241 retval += sizeof(struct input_event_compat);
242 }
243
244 return retval;
245 }
246 #endif
247
248 static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
249 {
250 struct evdev_list *list = file->private_data;
251 int retval;
252
253 #ifdef CONFIG_COMPAT
254 if (COMPAT_TEST)
255 return evdev_read_compat(file, buffer, count, ppos);
256 #endif
257
258 if (count < sizeof(struct input_event))
259 return -EINVAL;
260
261 if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK))
262 return -EAGAIN;
263
264 retval = wait_event_interruptible(list->evdev->wait,
265 list->head != list->tail || (!list->evdev->exist));
266
267 if (retval)
268 return retval;
269
270 if (!list->evdev->exist)
271 return -ENODEV;
272
273 while (list->head != list->tail && retval + sizeof(struct input_event) <= count) {
274 if (copy_to_user(buffer + retval, list->buffer + list->tail,
275 sizeof(struct input_event))) return -EFAULT;
276 list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
277 retval += sizeof(struct input_event);
278 }
279
280 return retval;
281 }
282
283 /* No kernel lock - fine */
284 static unsigned int evdev_poll(struct file *file, poll_table *wait)
285 {
286 struct evdev_list *list = file->private_data;
287 poll_wait(file, &list->evdev->wait, wait);
288 return ((list->head == list->tail) ? 0 : (POLLIN | POLLRDNORM)) |
289 (list->evdev->exist ? 0 : (POLLHUP | POLLERR));
290 }
291
292 static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
293 {
294 struct evdev_list *list = file->private_data;
295 struct evdev *evdev = list->evdev;
296 struct input_dev *dev = evdev->handle.dev;
297 struct input_absinfo abs;
298 void __user *p = (void __user *)arg;
299 int __user *ip = (int __user *)arg;
300 int i, t, u, v;
301
302 if (!evdev->exist) return -ENODEV;
303
304 switch (cmd) {
305
306 case EVIOCGVERSION:
307 return put_user(EV_VERSION, ip);
308
309 case EVIOCGID:
310 return copy_to_user(p, &dev->id, sizeof(struct input_id)) ? -EFAULT : 0;
311
312 case EVIOCGKEYCODE:
313 if (get_user(t, ip)) return -EFAULT;
314 if (t < 0 || t >= dev->keycodemax || !dev->keycodesize) return -EINVAL;
315 if (put_user(INPUT_KEYCODE(dev, t), ip + 1)) return -EFAULT;
316 return 0;
317
318 case EVIOCSKEYCODE:
319 if (get_user(t, ip)) return -EFAULT;
320 if (t < 0 || t >= dev->keycodemax || !dev->keycodesize) return -EINVAL;
321 if (get_user(v, ip + 1)) return -EFAULT;
322 if (v < 0 || v > KEY_MAX) return -EINVAL;
323 u = SET_INPUT_KEYCODE(dev, t, v);
324 clear_bit(u, dev->keybit);
325 set_bit(v, dev->keybit);
326 for (i = 0; i < dev->keycodemax; i++)
327 if (INPUT_KEYCODE(dev,i) == u)
328 set_bit(u, dev->keybit);
329 return 0;
330
331 case EVIOCSFF:
332 if (dev->upload_effect) {
333 struct ff_effect effect;
334 int err;
335
336 if (copy_from_user(&effect, p, sizeof(effect)))
337 return -EFAULT;
338 err = dev->upload_effect(dev, &effect);
339 if (put_user(effect.id, &(((struct ff_effect __user *)arg)->id)))
340 return -EFAULT;
341 return err;
342 }
343 else return -ENOSYS;
344
345 case EVIOCRMFF:
346 if (dev->erase_effect) {
347 return dev->erase_effect(dev, (int)arg);
348 }
349 else return -ENOSYS;
350
351 case EVIOCGEFFECTS:
352 if (put_user(dev->ff_effects_max, ip))
353 return -EFAULT;
354 return 0;
355
356 case EVIOCGRAB:
357 if (arg) {
358 if (evdev->grab)
359 return -EBUSY;
360 if (input_grab_device(&evdev->handle))
361 return -EBUSY;
362 evdev->grab = list;
363 return 0;
364 } else {
365 if (evdev->grab != list)
366 return -EINVAL;
367 input_release_device(&evdev->handle);
368 evdev->grab = NULL;
369 return 0;
370 }
371
372 default:
373
374 if (_IOC_TYPE(cmd) != 'E')
375 return -EINVAL;
376
377 if (_IOC_DIR(cmd) == _IOC_READ) {
378
379 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {
380
381 long *bits;
382 int len;
383
384 switch (_IOC_NR(cmd) & EV_MAX) {
385 case 0: bits = dev->evbit; len = EV_MAX; break;
386 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
387 case EV_REL: bits = dev->relbit; len = REL_MAX; break;
388 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
389 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
390 case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
391 case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
392 case EV_FF: bits = dev->ffbit; len = FF_MAX; break;
393 default: return -EINVAL;
394 }
395 len = NBITS(len) * sizeof(long);
396 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
397 return copy_to_user(p, bits, len) ? -EFAULT : len;
398 }
399
400 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) {
401 int len;
402 len = NBITS(KEY_MAX) * sizeof(long);
403 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
404 return copy_to_user(p, dev->key, len) ? -EFAULT : len;
405 }
406
407 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) {
408 int len;
409 len = NBITS(LED_MAX) * sizeof(long);
410 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
411 return copy_to_user(p, dev->led, len) ? -EFAULT : len;
412 }
413
414 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) {
415 int len;
416 len = NBITS(SND_MAX) * sizeof(long);
417 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
418 return copy_to_user(p, dev->snd, len) ? -EFAULT : len;
419 }
420
421 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) {
422 int len;
423 if (!dev->name) return -ENOENT;
424 len = strlen(dev->name) + 1;
425 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
426 return copy_to_user(p, dev->name, len) ? -EFAULT : len;
427 }
428
429 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) {
430 int len;
431 if (!dev->phys) return -ENOENT;
432 len = strlen(dev->phys) + 1;
433 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
434 return copy_to_user(p, dev->phys, len) ? -EFAULT : len;
435 }
436
437 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) {
438 int len;
439 if (!dev->uniq) return -ENOENT;
440 len = strlen(dev->uniq) + 1;
441 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
442 return copy_to_user(p, dev->uniq, len) ? -EFAULT : len;
443 }
444
445 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
446
447 int t = _IOC_NR(cmd) & ABS_MAX;
448
449 abs.value = dev->abs[t];
450 abs.minimum = dev->absmin[t];
451 abs.maximum = dev->absmax[t];
452 abs.fuzz = dev->absfuzz[t];
453 abs.flat = dev->absflat[t];
454
455 if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
456 return -EFAULT;
457
458 return 0;
459 }
460
461 }
462
463 if (_IOC_DIR(cmd) == _IOC_WRITE) {
464
465 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
466
467 int t = _IOC_NR(cmd) & ABS_MAX;
468
469 if (copy_from_user(&abs, p, sizeof(struct input_absinfo)))
470 return -EFAULT;
471
472 dev->abs[t] = abs.value;
473 dev->absmin[t] = abs.minimum;
474 dev->absmax[t] = abs.maximum;
475 dev->absfuzz[t] = abs.fuzz;
476 dev->absflat[t] = abs.flat;
477
478 return 0;
479 }
480 }
481 }
482 return -EINVAL;
483 }
484
485 #ifdef CONFIG_COMPAT
486
487 #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
488 #define NBITS_COMPAT(x) ((((x)-1)/BITS_PER_LONG_COMPAT)+1)
489 #define OFF_COMPAT(x) ((x)%BITS_PER_LONG_COMPAT)
490 #define BIT_COMPAT(x) (1UL<<OFF_COMPAT(x))
491 #define LONG_COMPAT(x) ((x)/BITS_PER_LONG_COMPAT)
492 #define test_bit_compat(bit, array) ((array[LONG_COMPAT(bit)] >> OFF_COMPAT(bit)) & 1)
493
494 #ifdef __BIG_ENDIAN
495 #define bit_to_user(bit, max) \
496 do { \
497 int i; \
498 int len = NBITS_COMPAT((max)) * sizeof(compat_long_t); \
499 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); \
500 for (i = 0; i < len / sizeof(compat_long_t); i++) \
501 if (copy_to_user((compat_long_t*) p + i, \
502 (compat_long_t*) (bit) + i + 1 - ((i % 2) << 1), \
503 sizeof(compat_long_t))) \
504 return -EFAULT; \
505 return len; \
506 } while (0)
507 #else
508 #define bit_to_user(bit, max) \
509 do { \
510 int len = NBITS_COMPAT((max)) * sizeof(compat_long_t); \
511 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); \
512 return copy_to_user(p, (bit), len) ? -EFAULT : len; \
513 } while (0)
514 #endif
515
516 static long evdev_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
517 {
518 struct evdev_list *list = file->private_data;
519 struct evdev *evdev = list->evdev;
520 struct input_dev *dev = evdev->handle.dev;
521 struct input_absinfo abs;
522 void __user *p = compat_ptr(arg);
523
524 if (!evdev->exist) return -ENODEV;
525
526 switch (cmd) {
527
528 case EVIOCGVERSION:
529 case EVIOCGID:
530 case EVIOCGKEYCODE:
531 case EVIOCSKEYCODE:
532 case EVIOCSFF:
533 case EVIOCRMFF:
534 case EVIOCGEFFECTS:
535 case EVIOCGRAB:
536 return evdev_ioctl(file, cmd, (unsigned long) p);
537
538 default:
539
540 if (_IOC_TYPE(cmd) != 'E')
541 return -EINVAL;
542
543 if (_IOC_DIR(cmd) == _IOC_READ) {
544
545 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {
546 long *bits;
547 int max;
548
549 switch (_IOC_NR(cmd) & EV_MAX) {
550 case 0: bits = dev->evbit; max = EV_MAX; break;
551 case EV_KEY: bits = dev->keybit; max = KEY_MAX; break;
552 case EV_REL: bits = dev->relbit; max = REL_MAX; break;
553 case EV_ABS: bits = dev->absbit; max = ABS_MAX; break;
554 case EV_MSC: bits = dev->mscbit; max = MSC_MAX; break;
555 case EV_LED: bits = dev->ledbit; max = LED_MAX; break;
556 case EV_SND: bits = dev->sndbit; max = SND_MAX; break;
557 case EV_FF: bits = dev->ffbit; max = FF_MAX; break;
558 default: return -EINVAL;
559 }
560 bit_to_user(bits, max);
561 }
562
563 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0)))
564 bit_to_user(dev->key, KEY_MAX);
565
566 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0)))
567 bit_to_user(dev->led, LED_MAX);
568
569 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0)))
570 bit_to_user(dev->snd, SND_MAX);
571
572 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) {
573 int len;
574 if (!dev->name) return -ENOENT;
575 len = strlen(dev->name) + 1;
576 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
577 return copy_to_user(p, dev->name, len) ? -EFAULT : len;
578 }
579
580 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) {
581 int len;
582 if (!dev->phys) return -ENOENT;
583 len = strlen(dev->phys) + 1;
584 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
585 return copy_to_user(p, dev->phys, len) ? -EFAULT : len;
586 }
587
588 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) {
589 int len;
590 if (!dev->uniq) return -ENOENT;
591 len = strlen(dev->uniq) + 1;
592 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
593 return copy_to_user(p, dev->uniq, len) ? -EFAULT : len;
594 }
595
596 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
597
598 int t = _IOC_NR(cmd) & ABS_MAX;
599
600 abs.value = dev->abs[t];
601 abs.minimum = dev->absmin[t];
602 abs.maximum = dev->absmax[t];
603 abs.fuzz = dev->absfuzz[t];
604 abs.flat = dev->absflat[t];
605
606 if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
607 return -EFAULT;
608
609 return 0;
610 }
611 }
612
613 if (_IOC_DIR(cmd) == _IOC_WRITE) {
614
615 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
616
617 int t = _IOC_NR(cmd) & ABS_MAX;
618
619 if (copy_from_user(&abs, p, sizeof(struct input_absinfo)))
620 return -EFAULT;
621
622 dev->abs[t] = abs.value;
623 dev->absmin[t] = abs.minimum;
624 dev->absmax[t] = abs.maximum;
625 dev->absfuzz[t] = abs.fuzz;
626 dev->absflat[t] = abs.flat;
627
628 return 0;
629 }
630 }
631 }
632 return -EINVAL;
633 }
634 #endif
635
636 static struct file_operations evdev_fops = {
637 .owner = THIS_MODULE,
638 .read = evdev_read,
639 .write = evdev_write,
640 .poll = evdev_poll,
641 .open = evdev_open,
642 .release = evdev_release,
643 .unlocked_ioctl = evdev_ioctl,
644 #ifdef CONFIG_COMPAT
645 .compat_ioctl = evdev_ioctl_compat,
646 #endif
647 .fasync = evdev_fasync,
648 .flush = evdev_flush
649 };
650
651 static struct input_handle *evdev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
652 {
653 struct evdev *evdev;
654 int minor;
655
656 for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++);
657 if (minor == EVDEV_MINORS) {
658 printk(KERN_ERR "evdev: no more free evdev devices\n");
659 return NULL;
660 }
661
662 if (!(evdev = kmalloc(sizeof(struct evdev), GFP_KERNEL)))
663 return NULL;
664 memset(evdev, 0, sizeof(struct evdev));
665
666 INIT_LIST_HEAD(&evdev->list);
667 init_waitqueue_head(&evdev->wait);
668
669 evdev->exist = 1;
670 evdev->minor = minor;
671 evdev->handle.dev = dev;
672 evdev->handle.name = evdev->name;
673 evdev->handle.handler = handler;
674 evdev->handle.private = evdev;
675 sprintf(evdev->name, "event%d", minor);
676
677 evdev_table[minor] = evdev;
678
679 devfs_mk_cdev(MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
680 S_IFCHR|S_IRUGO|S_IWUSR, "input/event%d", minor);
681 class_device_create(input_class,
682 MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
683 dev->dev, "event%d", minor);
684
685 return &evdev->handle;
686 }
687
688 static void evdev_disconnect(struct input_handle *handle)
689 {
690 struct evdev *evdev = handle->private;
691 struct evdev_list *list;
692
693 class_device_destroy(input_class,
694 MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + evdev->minor));
695 devfs_remove("input/event%d", evdev->minor);
696 evdev->exist = 0;
697
698 if (evdev->open) {
699 input_close_device(handle);
700 wake_up_interruptible(&evdev->wait);
701 list_for_each_entry(list, &evdev->list, node)
702 kill_fasync(&list->fasync, SIGIO, POLL_HUP);
703 } else
704 evdev_free(evdev);
705 }
706
707 static struct input_device_id evdev_ids[] = {
708 { .driver_info = 1 }, /* Matches all devices */
709 { }, /* Terminating zero entry */
710 };
711
712 MODULE_DEVICE_TABLE(input, evdev_ids);
713
714 static struct input_handler evdev_handler = {
715 .event = evdev_event,
716 .connect = evdev_connect,
717 .disconnect = evdev_disconnect,
718 .fops = &evdev_fops,
719 .minor = EVDEV_MINOR_BASE,
720 .name = "evdev",
721 .id_table = evdev_ids,
722 };
723
724 static int __init evdev_init(void)
725 {
726 input_register_handler(&evdev_handler);
727 return 0;
728 }
729
730 static void __exit evdev_exit(void)
731 {
732 input_unregister_handler(&evdev_handler);
733 }
734
735 module_init(evdev_init);
736 module_exit(evdev_exit);
737
738 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
739 MODULE_DESCRIPTION("Input driver event char devices");
740 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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