xref: /linux/drivers/input/evdev.c (revision f3d9478b2ce468c3115b02ecae7e975990697f15)
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/compat.h>
24 
25 struct 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 
36 struct 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 
45 static struct evdev *evdev_table[EVDEV_MINORS];
46 
47 static 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 
77 static int evdev_fasync(int fd, struct file *file, int on)
78 {
79 	int retval;
80 	struct evdev_list *list = file->private_data;
81 	retval = fasync_helper(fd, file, on, &list->fasync);
82 	return retval < 0 ? retval : 0;
83 }
84 
85 static int evdev_flush(struct file * file)
86 {
87 	struct evdev_list *list = file->private_data;
88 	if (!list->evdev->exist) return -ENODEV;
89 	return input_flush_device(&list->evdev->handle, file);
90 }
91 
92 static void evdev_free(struct evdev *evdev)
93 {
94 	evdev_table[evdev->minor] = NULL;
95 	kfree(evdev);
96 }
97 
98 static int evdev_release(struct inode * inode, struct file * file)
99 {
100 	struct evdev_list *list = file->private_data;
101 
102 	if (list->evdev->grab == list) {
103 		input_release_device(&list->evdev->handle);
104 		list->evdev->grab = NULL;
105 	}
106 
107 	evdev_fasync(-1, file, 0);
108 	list_del(&list->node);
109 
110 	if (!--list->evdev->open) {
111 		if (list->evdev->exist)
112 			input_close_device(&list->evdev->handle);
113 		else
114 			evdev_free(list->evdev);
115 	}
116 
117 	kfree(list);
118 	return 0;
119 }
120 
121 static int evdev_open(struct inode * inode, struct file * file)
122 {
123 	struct evdev_list *list;
124 	int i = iminor(inode) - EVDEV_MINOR_BASE;
125 	int accept_err;
126 
127 	if (i >= EVDEV_MINORS || !evdev_table[i] || !evdev_table[i]->exist)
128 		return -ENODEV;
129 
130 	if ((accept_err = input_accept_process(&(evdev_table[i]->handle), file)))
131 		return accept_err;
132 
133 	if (!(list = kzalloc(sizeof(struct evdev_list), GFP_KERNEL)))
134 		return -ENOMEM;
135 
136 	list->evdev = evdev_table[i];
137 	list_add_tail(&list->node, &evdev_table[i]->list);
138 	file->private_data = list;
139 
140 	if (!list->evdev->open++)
141 		if (list->evdev->exist)
142 			input_open_device(&list->evdev->handle);
143 
144 	return 0;
145 }
146 
147 #ifdef CONFIG_COMPAT
148 
149 struct input_event_compat {
150 	struct compat_timeval time;
151 	__u16 type;
152 	__u16 code;
153 	__s32 value;
154 };
155 
156 /* Note to the author of this code: did it ever occur to
157    you why the ifdefs are needed? Think about it again. -AK */
158 #ifdef CONFIG_X86_64
159 #  define COMPAT_TEST is_compat_task()
160 #elif defined(CONFIG_IA64)
161 #  define COMPAT_TEST IS_IA32_PROCESS(task_pt_regs(current))
162 #elif defined(CONFIG_S390)
163 #  define COMPAT_TEST test_thread_flag(TIF_31BIT)
164 #elif defined(CONFIG_MIPS)
165 #  define COMPAT_TEST (current->thread.mflags & MF_32BIT_ADDR)
166 #else
167 #  define COMPAT_TEST test_thread_flag(TIF_32BIT)
168 #endif
169 
170 static inline size_t evdev_event_size(void)
171 {
172 	return COMPAT_TEST ?
173 		sizeof(struct input_event_compat) : sizeof(struct input_event);
174 }
175 
176 static int evdev_event_from_user(const char __user *buffer, struct input_event *event)
177 {
178 	if (COMPAT_TEST) {
179 		struct input_event_compat compat_event;
180 
181 		if (copy_from_user(&compat_event, buffer, sizeof(struct input_event_compat)))
182 			return -EFAULT;
183 
184 		event->time.tv_sec = compat_event.time.tv_sec;
185 		event->time.tv_usec = compat_event.time.tv_usec;
186 		event->type = compat_event.type;
187 		event->code = compat_event.code;
188 		event->value = compat_event.value;
189 
190 	} else {
191 		if (copy_from_user(event, buffer, sizeof(struct input_event)))
192 			return -EFAULT;
193 	}
194 
195 	return 0;
196 }
197 
198 static int evdev_event_to_user(char __user *buffer, const struct input_event *event)
199 {
200 	if (COMPAT_TEST) {
201 		struct input_event_compat compat_event;
202 
203 		compat_event.time.tv_sec = event->time.tv_sec;
204 		compat_event.time.tv_usec = event->time.tv_usec;
205 		compat_event.type = event->type;
206 		compat_event.code = event->code;
207 		compat_event.value = event->value;
208 
209 		if (copy_to_user(buffer, &compat_event, sizeof(struct input_event_compat)))
210 			return -EFAULT;
211 
212 	} else {
213 		if (copy_to_user(buffer, event, sizeof(struct input_event)))
214 			return -EFAULT;
215 	}
216 
217 	return 0;
218 }
219 
220 #else
221 
222 static inline size_t evdev_event_size(void)
223 {
224 	return sizeof(struct input_event);
225 }
226 
227 static int evdev_event_from_user(const char __user *buffer, struct input_event *event)
228 {
229 	if (copy_from_user(event, buffer, sizeof(struct input_event)))
230 		return -EFAULT;
231 
232 	return 0;
233 }
234 
235 static int evdev_event_to_user(char __user *buffer, const struct input_event *event)
236 {
237 	if (copy_to_user(buffer, event, sizeof(struct input_event)))
238 		return -EFAULT;
239 
240 	return 0;
241 }
242 
243 #endif /* CONFIG_COMPAT */
244 
245 static ssize_t evdev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
246 {
247 	struct evdev_list *list = file->private_data;
248 	struct input_event event;
249 	int retval = 0;
250 
251 	if (!list->evdev->exist)
252 		return -ENODEV;
253 
254 	while (retval < count) {
255 
256 		if (evdev_event_from_user(buffer + retval, &event))
257 			return -EFAULT;
258 		input_event(list->evdev->handle.dev, event.type, event.code, event.value);
259 		retval += evdev_event_size();
260 	}
261 
262 	return retval;
263 }
264 
265 static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
266 {
267 	struct evdev_list *list = file->private_data;
268 	int retval;
269 
270 	if (count < evdev_event_size())
271 		return -EINVAL;
272 
273 	if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK))
274 		return -EAGAIN;
275 
276 	retval = wait_event_interruptible(list->evdev->wait,
277 		list->head != list->tail || (!list->evdev->exist));
278 
279 	if (retval)
280 		return retval;
281 
282 	if (!list->evdev->exist)
283 		return -ENODEV;
284 
285 	while (list->head != list->tail && retval + evdev_event_size() <= count) {
286 
287 		struct input_event *event = (struct input_event *) list->buffer + list->tail;
288 
289 		if (evdev_event_to_user(buffer + retval, event))
290 			return -EFAULT;
291 
292 		list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
293 		retval += evdev_event_size();
294 	}
295 
296 	return retval;
297 }
298 
299 /* No kernel lock - fine */
300 static unsigned int evdev_poll(struct file *file, poll_table *wait)
301 {
302 	struct evdev_list *list = file->private_data;
303 	poll_wait(file, &list->evdev->wait, wait);
304 	return ((list->head == list->tail) ? 0 : (POLLIN | POLLRDNORM)) |
305 		(list->evdev->exist ? 0 : (POLLHUP | POLLERR));
306 }
307 
308 #ifdef CONFIG_COMPAT
309 
310 #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
311 #define NBITS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1)
312 
313 #ifdef __BIG_ENDIAN
314 static int bits_to_user(unsigned long *bits, unsigned int maxbit,
315 			unsigned int maxlen, void __user *p, int compat)
316 {
317 	int len, i;
318 
319 	if (compat) {
320 		len = NBITS_COMPAT(maxbit) * sizeof(compat_long_t);
321 		if (len < maxlen)
322 			len = maxlen;
323 
324 		for (i = 0; i < len / sizeof(compat_long_t); i++)
325 			if (copy_to_user((compat_long_t __user *) p + i,
326 					 (compat_long_t *) bits +
327 						i + 1 - ((i % 2) << 1),
328 					 sizeof(compat_long_t)))
329 				return -EFAULT;
330 	} else {
331 		len = NBITS(maxbit) * sizeof(long);
332 		if (len > maxlen)
333 			len = maxlen;
334 
335 		if (copy_to_user(p, bits, len))
336 			return -EFAULT;
337 	}
338 
339 	return len;
340 }
341 #else
342 static int bits_to_user(unsigned long *bits, unsigned int maxbit,
343 			unsigned int maxlen, void __user *p, int compat)
344 {
345 	int len = compat ?
346 			NBITS_COMPAT(maxbit) * sizeof(compat_long_t) :
347 			NBITS(maxbit) * sizeof(long);
348 
349 	if (len > maxlen)
350 		len = maxlen;
351 
352 	return copy_to_user(p, bits, len) ? -EFAULT : len;
353 }
354 #endif /* __BIG_ENDIAN */
355 
356 #else
357 
358 static int bits_to_user(unsigned long *bits, unsigned int maxbit,
359 			unsigned int maxlen, void __user *p, int compat)
360 {
361 	int len = NBITS(maxbit) * sizeof(long);
362 
363 	if (len > maxlen)
364 		len = maxlen;
365 
366 	return copy_to_user(p, bits, len) ? -EFAULT : len;
367 }
368 
369 #endif /* CONFIG_COMPAT */
370 
371 static int str_to_user(const char *str, unsigned int maxlen, void __user *p)
372 {
373 	int len;
374 
375 	if (!str)
376 		return -ENOENT;
377 
378 	len = strlen(str) + 1;
379 	if (len > maxlen)
380 		len = maxlen;
381 
382 	return copy_to_user(p, str, len) ? -EFAULT : len;
383 }
384 
385 static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
386 				void __user *p, int compat_mode)
387 {
388 	struct evdev_list *list = file->private_data;
389 	struct evdev *evdev = list->evdev;
390 	struct input_dev *dev = evdev->handle.dev;
391 	struct input_absinfo abs;
392 	int __user *ip = (int __user *)p;
393 	int i, t, u, v;
394 
395 	if (!evdev->exist)
396 		return -ENODEV;
397 
398 	switch (cmd) {
399 
400 		case EVIOCGVERSION:
401 			return put_user(EV_VERSION, ip);
402 
403 		case EVIOCGID:
404 			if (copy_to_user(p, &dev->id, sizeof(struct input_id)))
405 				return -EFAULT;
406 			return 0;
407 
408 		case EVIOCGREP:
409 			if (!test_bit(EV_REP, dev->evbit))
410 				return -ENOSYS;
411 			if (put_user(dev->rep[REP_DELAY], ip))
412 				return -EFAULT;
413 			if (put_user(dev->rep[REP_PERIOD], ip + 1))
414 				return -EFAULT;
415 			return 0;
416 
417 		case EVIOCSREP:
418 			if (!test_bit(EV_REP, dev->evbit))
419 				return -ENOSYS;
420 			if (get_user(u, ip))
421 				return -EFAULT;
422 			if (get_user(v, ip + 1))
423 				return -EFAULT;
424 
425 			input_event(dev, EV_REP, REP_DELAY, u);
426 			input_event(dev, EV_REP, REP_PERIOD, v);
427 
428 			return 0;
429 
430 		case EVIOCGKEYCODE:
431 			if (get_user(t, ip))
432 				return -EFAULT;
433 			if (t < 0 || t >= dev->keycodemax || !dev->keycodesize)
434 				return -EINVAL;
435 			if (put_user(INPUT_KEYCODE(dev, t), ip + 1))
436 				return -EFAULT;
437 			return 0;
438 
439 		case EVIOCSKEYCODE:
440 			if (get_user(t, ip))
441 				return -EFAULT;
442 			if (t < 0 || t >= dev->keycodemax || !dev->keycodesize)
443 				return -EINVAL;
444 			if (get_user(v, ip + 1))
445 				return -EFAULT;
446 			if (v < 0 || v > KEY_MAX)
447 				return -EINVAL;
448 			if (dev->keycodesize < sizeof(v) && (v >> (dev->keycodesize * 8)))
449 				return -EINVAL;
450 
451 			u = SET_INPUT_KEYCODE(dev, t, v);
452 			clear_bit(u, dev->keybit);
453 			set_bit(v, dev->keybit);
454 			for (i = 0; i < dev->keycodemax; i++)
455 				if (INPUT_KEYCODE(dev, i) == u)
456 					set_bit(u, dev->keybit);
457 
458 			return 0;
459 
460 		case EVIOCSFF:
461 			if (dev->upload_effect) {
462 				struct ff_effect effect;
463 				int err;
464 
465 				if (copy_from_user(&effect, p, sizeof(effect)))
466 					return -EFAULT;
467 				err = dev->upload_effect(dev, &effect);
468 				if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
469 					return -EFAULT;
470 				return err;
471 			} else
472 				return -ENOSYS;
473 
474 		case EVIOCRMFF:
475 			if (!dev->erase_effect)
476 				return -ENOSYS;
477 
478 			return dev->erase_effect(dev, (int)(unsigned long) p);
479 
480 		case EVIOCGEFFECTS:
481 			if (put_user(dev->ff_effects_max, ip))
482 				return -EFAULT;
483 			return 0;
484 
485 		case EVIOCGRAB:
486 			if (p) {
487 				if (evdev->grab)
488 					return -EBUSY;
489 				if (input_grab_device(&evdev->handle))
490 					return -EBUSY;
491 				evdev->grab = list;
492 				return 0;
493 			} else {
494 				if (evdev->grab != list)
495 					return -EINVAL;
496 				input_release_device(&evdev->handle);
497 				evdev->grab = NULL;
498 				return 0;
499 			}
500 
501 		default:
502 
503 			if (_IOC_TYPE(cmd) != 'E')
504 				return -EINVAL;
505 
506 			if (_IOC_DIR(cmd) == _IOC_READ) {
507 
508 				if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {
509 
510 					long *bits;
511 					int len;
512 
513 					switch (_IOC_NR(cmd) & EV_MAX) {
514 						case      0: bits = dev->evbit;  len = EV_MAX;  break;
515 						case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
516 						case EV_REL: bits = dev->relbit; len = REL_MAX; break;
517 						case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
518 						case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
519 						case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
520 						case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
521 						case EV_FF:  bits = dev->ffbit;  len = FF_MAX;  break;
522 						case EV_SW:  bits = dev->swbit;  len = SW_MAX;  break;
523 						default: return -EINVAL;
524 					}
525 					return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode);
526 				}
527 
528 				if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0)))
529 					return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd),
530 							    p, compat_mode);
531 
532 				if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0)))
533 					return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd),
534 							    p, compat_mode);
535 
536 				if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0)))
537 					return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd),
538 							    p, compat_mode);
539 
540 				if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0)))
541 					return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd),
542 							    p, compat_mode);
543 
544 				if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0)))
545 					return str_to_user(dev->name, _IOC_SIZE(cmd), p);
546 
547 				if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0)))
548 					return str_to_user(dev->phys, _IOC_SIZE(cmd), p);
549 
550 				if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0)))
551 					return str_to_user(dev->uniq, _IOC_SIZE(cmd), p);
552 
553 				if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
554 
555 					int t = _IOC_NR(cmd) & ABS_MAX;
556 
557 					abs.value = dev->abs[t];
558 					abs.minimum = dev->absmin[t];
559 					abs.maximum = dev->absmax[t];
560 					abs.fuzz = dev->absfuzz[t];
561 					abs.flat = dev->absflat[t];
562 
563 					if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
564 						return -EFAULT;
565 
566 					return 0;
567 				}
568 
569 			}
570 
571 			if (_IOC_DIR(cmd) == _IOC_WRITE) {
572 
573 				if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
574 
575 					int t = _IOC_NR(cmd) & ABS_MAX;
576 
577 					if (copy_from_user(&abs, p, sizeof(struct input_absinfo)))
578 						return -EFAULT;
579 
580 					dev->abs[t] = abs.value;
581 					dev->absmin[t] = abs.minimum;
582 					dev->absmax[t] = abs.maximum;
583 					dev->absfuzz[t] = abs.fuzz;
584 					dev->absflat[t] = abs.flat;
585 
586 					return 0;
587 				}
588 			}
589 	}
590 	return -EINVAL;
591 }
592 
593 static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
594 {
595 	return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);
596 }
597 
598 #ifdef CONFIG_COMPAT
599 static long evdev_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
600 {
601 	return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1);
602 }
603 #endif
604 
605 static struct file_operations evdev_fops = {
606 	.owner =	THIS_MODULE,
607 	.read =		evdev_read,
608 	.write =	evdev_write,
609 	.poll =		evdev_poll,
610 	.open =		evdev_open,
611 	.release =	evdev_release,
612 	.unlocked_ioctl = evdev_ioctl,
613 #ifdef CONFIG_COMPAT
614 	.compat_ioctl =	evdev_ioctl_compat,
615 #endif
616 	.fasync =	evdev_fasync,
617 	.flush =	evdev_flush
618 };
619 
620 static struct input_handle *evdev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
621 {
622 	struct evdev *evdev;
623 	struct class_device *cdev;
624 	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 
632 	if (!(evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL)))
633 		return NULL;
634 
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 
648 	cdev = class_device_create(&input_class, &dev->cdev,
649 			MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
650 			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);
655 
656 	return &evdev->handle;
657 }
658 
659 static void evdev_disconnect(struct input_handle *handle)
660 {
661 	struct evdev *evdev = handle->private;
662 	struct evdev_list *list;
663 
664 	sysfs_remove_link(&input_class.subsys.kset.kobj, evdev->name);
665 	class_device_destroy(&input_class,
666 			MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + evdev->minor));
667 	evdev->exist = 0;
668 
669 	if (evdev->open) {
670 		input_close_device(handle);
671 		wake_up_interruptible(&evdev->wait);
672 		list_for_each_entry(list, &evdev->list, node)
673 			kill_fasync(&list->fasync, SIGIO, POLL_HUP);
674 	} else
675 		evdev_free(evdev);
676 }
677 
678 static struct input_device_id evdev_ids[] = {
679 	{ .driver_info = 1 },	/* Matches all devices */
680 	{ },			/* Terminating zero entry */
681 };
682 
683 MODULE_DEVICE_TABLE(input, evdev_ids);
684 
685 static struct input_handler evdev_handler = {
686 	.event =	evdev_event,
687 	.connect =	evdev_connect,
688 	.disconnect =	evdev_disconnect,
689 	.fops =		&evdev_fops,
690 	.minor =	EVDEV_MINOR_BASE,
691 	.name =		"evdev",
692 	.id_table =	evdev_ids,
693 };
694 
695 static int __init evdev_init(void)
696 {
697 	input_register_handler(&evdev_handler);
698 	return 0;
699 }
700 
701 static void __exit evdev_exit(void)
702 {
703 	input_unregister_handler(&evdev_handler);
704 }
705 
706 module_init(evdev_init);
707 module_exit(evdev_exit);
708 
709 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
710 MODULE_DESCRIPTION("Input driver event char devices");
711 MODULE_LICENSE("GPL");
712