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[PATCH] remove many unneeded #includes of sched.h
[deliverable/linux.git] / drivers / input / input.c
1 /*
2 * The input core
3 *
4 * Copyright (c) 1999-2002 Vojtech Pavlik
5 */
6
7 /*
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 as published by
10 * the Free Software Foundation.
11 */
12
13 #include <linux/init.h>
14 #include <linux/smp_lock.h>
15 #include <linux/input.h>
16 #include <linux/module.h>
17 #include <linux/random.h>
18 #include <linux/major.h>
19 #include <linux/proc_fs.h>
20 #include <linux/seq_file.h>
21 #include <linux/interrupt.h>
22 #include <linux/poll.h>
23 #include <linux/device.h>
24 #include <linux/mutex.h>
25
26 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
27 MODULE_DESCRIPTION("Input core");
28 MODULE_LICENSE("GPL");
29
30 #define INPUT_DEVICES 256
31
32 static LIST_HEAD(input_dev_list);
33 static LIST_HEAD(input_handler_list);
34
35 static struct input_handler *input_table[8];
36
37 /**
38 * input_event() - report new input event
39 * @dev: device that generated the event
40 * @type: type of the event
41 * @code: event code
42 * @value: value of the event
43 *
44 * This function should be used by drivers implementing various input devices
45 * See also input_inject_event()
46 */
47 void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
48 {
49 struct input_handle *handle;
50
51 if (type > EV_MAX || !test_bit(type, dev->evbit))
52 return;
53
54 add_input_randomness(type, code, value);
55
56 switch (type) {
57
58 case EV_SYN:
59 switch (code) {
60 case SYN_CONFIG:
61 if (dev->event)
62 dev->event(dev, type, code, value);
63 break;
64
65 case SYN_REPORT:
66 if (dev->sync)
67 return;
68 dev->sync = 1;
69 break;
70 }
71 break;
72
73 case EV_KEY:
74
75 if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value)
76 return;
77
78 if (value == 2)
79 break;
80
81 change_bit(code, dev->key);
82
83 if (test_bit(EV_REP, dev->evbit) && dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && dev->timer.data && value) {
84 dev->repeat_key = code;
85 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
86 }
87
88 break;
89
90 case EV_SW:
91
92 if (code > SW_MAX || !test_bit(code, dev->swbit) || !!test_bit(code, dev->sw) == value)
93 return;
94
95 change_bit(code, dev->sw);
96
97 break;
98
99 case EV_ABS:
100
101 if (code > ABS_MAX || !test_bit(code, dev->absbit))
102 return;
103
104 if (dev->absfuzz[code]) {
105 if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) &&
106 (value < dev->abs[code] + (dev->absfuzz[code] >> 1)))
107 return;
108
109 if ((value > dev->abs[code] - dev->absfuzz[code]) &&
110 (value < dev->abs[code] + dev->absfuzz[code]))
111 value = (dev->abs[code] * 3 + value) >> 2;
112
113 if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) &&
114 (value < dev->abs[code] + (dev->absfuzz[code] << 1)))
115 value = (dev->abs[code] + value) >> 1;
116 }
117
118 if (dev->abs[code] == value)
119 return;
120
121 dev->abs[code] = value;
122 break;
123
124 case EV_REL:
125
126 if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0))
127 return;
128
129 break;
130
131 case EV_MSC:
132
133 if (code > MSC_MAX || !test_bit(code, dev->mscbit))
134 return;
135
136 if (dev->event)
137 dev->event(dev, type, code, value);
138
139 break;
140
141 case EV_LED:
142
143 if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value)
144 return;
145
146 change_bit(code, dev->led);
147
148 if (dev->event)
149 dev->event(dev, type, code, value);
150
151 break;
152
153 case EV_SND:
154
155 if (code > SND_MAX || !test_bit(code, dev->sndbit))
156 return;
157
158 if (!!test_bit(code, dev->snd) != !!value)
159 change_bit(code, dev->snd);
160
161 if (dev->event)
162 dev->event(dev, type, code, value);
163
164 break;
165
166 case EV_REP:
167
168 if (code > REP_MAX || value < 0 || dev->rep[code] == value)
169 return;
170
171 dev->rep[code] = value;
172 if (dev->event)
173 dev->event(dev, type, code, value);
174
175 break;
176
177 case EV_FF:
178
179 if (value < 0)
180 return;
181
182 if (dev->event)
183 dev->event(dev, type, code, value);
184 break;
185 }
186
187 if (type != EV_SYN)
188 dev->sync = 0;
189
190 if (dev->grab)
191 dev->grab->handler->event(dev->grab, type, code, value);
192 else
193 list_for_each_entry(handle, &dev->h_list, d_node)
194 if (handle->open)
195 handle->handler->event(handle, type, code, value);
196 }
197 EXPORT_SYMBOL(input_event);
198
199 /**
200 * input_inject_event() - send input event from input handler
201 * @handle: input handle to send event through
202 * @type: type of the event
203 * @code: event code
204 * @value: value of the event
205 *
206 * Similar to input_event() but will ignore event if device is "grabbed" and handle
207 * injecting event is not the one that owns the device.
208 */
209 void input_inject_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
210 {
211 if (!handle->dev->grab || handle->dev->grab == handle)
212 input_event(handle->dev, type, code, value);
213 }
214 EXPORT_SYMBOL(input_inject_event);
215
216 static void input_repeat_key(unsigned long data)
217 {
218 struct input_dev *dev = (void *) data;
219
220 if (!test_bit(dev->repeat_key, dev->key))
221 return;
222
223 input_event(dev, EV_KEY, dev->repeat_key, 2);
224 input_sync(dev);
225
226 if (dev->rep[REP_PERIOD])
227 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD]));
228 }
229
230 int input_grab_device(struct input_handle *handle)
231 {
232 if (handle->dev->grab)
233 return -EBUSY;
234
235 handle->dev->grab = handle;
236 return 0;
237 }
238 EXPORT_SYMBOL(input_grab_device);
239
240 void input_release_device(struct input_handle *handle)
241 {
242 struct input_dev *dev = handle->dev;
243
244 if (dev->grab == handle) {
245 dev->grab = NULL;
246
247 list_for_each_entry(handle, &dev->h_list, d_node)
248 if (handle->handler->start)
249 handle->handler->start(handle);
250 }
251 }
252 EXPORT_SYMBOL(input_release_device);
253
254 int input_open_device(struct input_handle *handle)
255 {
256 struct input_dev *dev = handle->dev;
257 int err;
258
259 err = mutex_lock_interruptible(&dev->mutex);
260 if (err)
261 return err;
262
263 handle->open++;
264
265 if (!dev->users++ && dev->open)
266 err = dev->open(dev);
267
268 if (err)
269 handle->open--;
270
271 mutex_unlock(&dev->mutex);
272
273 return err;
274 }
275 EXPORT_SYMBOL(input_open_device);
276
277 int input_flush_device(struct input_handle* handle, struct file* file)
278 {
279 if (handle->dev->flush)
280 return handle->dev->flush(handle->dev, file);
281
282 return 0;
283 }
284 EXPORT_SYMBOL(input_flush_device);
285
286 void input_close_device(struct input_handle *handle)
287 {
288 struct input_dev *dev = handle->dev;
289
290 input_release_device(handle);
291
292 mutex_lock(&dev->mutex);
293
294 if (!--dev->users && dev->close)
295 dev->close(dev);
296 handle->open--;
297
298 mutex_unlock(&dev->mutex);
299 }
300 EXPORT_SYMBOL(input_close_device);
301
302 static void input_link_handle(struct input_handle *handle)
303 {
304 list_add_tail(&handle->d_node, &handle->dev->h_list);
305 list_add_tail(&handle->h_node, &handle->handler->h_list);
306 }
307
308 #define MATCH_BIT(bit, max) \
309 for (i = 0; i < NBITS(max); i++) \
310 if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
311 break; \
312 if (i != NBITS(max)) \
313 continue;
314
315 static const struct input_device_id *input_match_device(const struct input_device_id *id,
316 struct input_dev *dev)
317 {
318 int i;
319
320 for (; id->flags || id->driver_info; id++) {
321
322 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
323 if (id->bustype != dev->id.bustype)
324 continue;
325
326 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
327 if (id->vendor != dev->id.vendor)
328 continue;
329
330 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
331 if (id->product != dev->id.product)
332 continue;
333
334 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
335 if (id->version != dev->id.version)
336 continue;
337
338 MATCH_BIT(evbit, EV_MAX);
339 MATCH_BIT(keybit, KEY_MAX);
340 MATCH_BIT(relbit, REL_MAX);
341 MATCH_BIT(absbit, ABS_MAX);
342 MATCH_BIT(mscbit, MSC_MAX);
343 MATCH_BIT(ledbit, LED_MAX);
344 MATCH_BIT(sndbit, SND_MAX);
345 MATCH_BIT(ffbit, FF_MAX);
346 MATCH_BIT(swbit, SW_MAX);
347
348 return id;
349 }
350
351 return NULL;
352 }
353
354 #ifdef CONFIG_PROC_FS
355
356 static struct proc_dir_entry *proc_bus_input_dir;
357 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
358 static int input_devices_state;
359
360 static inline void input_wakeup_procfs_readers(void)
361 {
362 input_devices_state++;
363 wake_up(&input_devices_poll_wait);
364 }
365
366 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
367 {
368 int state = input_devices_state;
369
370 poll_wait(file, &input_devices_poll_wait, wait);
371 if (state != input_devices_state)
372 return POLLIN | POLLRDNORM;
373
374 return 0;
375 }
376
377 static struct list_head *list_get_nth_element(struct list_head *list, loff_t *pos)
378 {
379 struct list_head *node;
380 loff_t i = 0;
381
382 list_for_each(node, list)
383 if (i++ == *pos)
384 return node;
385
386 return NULL;
387 }
388
389 static struct list_head *list_get_next_element(struct list_head *list, struct list_head *element, loff_t *pos)
390 {
391 if (element->next == list)
392 return NULL;
393
394 ++(*pos);
395 return element->next;
396 }
397
398 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
399 {
400 /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
401
402 return list_get_nth_element(&input_dev_list, pos);
403 }
404
405 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
406 {
407 return list_get_next_element(&input_dev_list, v, pos);
408 }
409
410 static void input_devices_seq_stop(struct seq_file *seq, void *v)
411 {
412 /* release lock here */
413 }
414
415 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
416 unsigned long *bitmap, int max)
417 {
418 int i;
419
420 for (i = NBITS(max) - 1; i > 0; i--)
421 if (bitmap[i])
422 break;
423
424 seq_printf(seq, "B: %s=", name);
425 for (; i >= 0; i--)
426 seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : "");
427 seq_putc(seq, '\n');
428 }
429
430 static int input_devices_seq_show(struct seq_file *seq, void *v)
431 {
432 struct input_dev *dev = container_of(v, struct input_dev, node);
433 const char *path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
434 struct input_handle *handle;
435
436 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
437 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
438
439 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
440 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
441 seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
442 seq_printf(seq, "H: Handlers=");
443
444 list_for_each_entry(handle, &dev->h_list, d_node)
445 seq_printf(seq, "%s ", handle->name);
446 seq_putc(seq, '\n');
447
448 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
449 if (test_bit(EV_KEY, dev->evbit))
450 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
451 if (test_bit(EV_REL, dev->evbit))
452 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
453 if (test_bit(EV_ABS, dev->evbit))
454 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
455 if (test_bit(EV_MSC, dev->evbit))
456 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
457 if (test_bit(EV_LED, dev->evbit))
458 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
459 if (test_bit(EV_SND, dev->evbit))
460 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
461 if (test_bit(EV_FF, dev->evbit))
462 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
463 if (test_bit(EV_SW, dev->evbit))
464 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
465
466 seq_putc(seq, '\n');
467
468 kfree(path);
469 return 0;
470 }
471
472 static struct seq_operations input_devices_seq_ops = {
473 .start = input_devices_seq_start,
474 .next = input_devices_seq_next,
475 .stop = input_devices_seq_stop,
476 .show = input_devices_seq_show,
477 };
478
479 static int input_proc_devices_open(struct inode *inode, struct file *file)
480 {
481 return seq_open(file, &input_devices_seq_ops);
482 }
483
484 static const struct file_operations input_devices_fileops = {
485 .owner = THIS_MODULE,
486 .open = input_proc_devices_open,
487 .poll = input_proc_devices_poll,
488 .read = seq_read,
489 .llseek = seq_lseek,
490 .release = seq_release,
491 };
492
493 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
494 {
495 /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
496 seq->private = (void *)(unsigned long)*pos;
497 return list_get_nth_element(&input_handler_list, pos);
498 }
499
500 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
501 {
502 seq->private = (void *)(unsigned long)(*pos + 1);
503 return list_get_next_element(&input_handler_list, v, pos);
504 }
505
506 static void input_handlers_seq_stop(struct seq_file *seq, void *v)
507 {
508 /* release lock here */
509 }
510
511 static int input_handlers_seq_show(struct seq_file *seq, void *v)
512 {
513 struct input_handler *handler = container_of(v, struct input_handler, node);
514
515 seq_printf(seq, "N: Number=%ld Name=%s",
516 (unsigned long)seq->private, handler->name);
517 if (handler->fops)
518 seq_printf(seq, " Minor=%d", handler->minor);
519 seq_putc(seq, '\n');
520
521 return 0;
522 }
523 static struct seq_operations input_handlers_seq_ops = {
524 .start = input_handlers_seq_start,
525 .next = input_handlers_seq_next,
526 .stop = input_handlers_seq_stop,
527 .show = input_handlers_seq_show,
528 };
529
530 static int input_proc_handlers_open(struct inode *inode, struct file *file)
531 {
532 return seq_open(file, &input_handlers_seq_ops);
533 }
534
535 static const struct file_operations input_handlers_fileops = {
536 .owner = THIS_MODULE,
537 .open = input_proc_handlers_open,
538 .read = seq_read,
539 .llseek = seq_lseek,
540 .release = seq_release,
541 };
542
543 static int __init input_proc_init(void)
544 {
545 struct proc_dir_entry *entry;
546
547 proc_bus_input_dir = proc_mkdir("input", proc_bus);
548 if (!proc_bus_input_dir)
549 return -ENOMEM;
550
551 proc_bus_input_dir->owner = THIS_MODULE;
552
553 entry = create_proc_entry("devices", 0, proc_bus_input_dir);
554 if (!entry)
555 goto fail1;
556
557 entry->owner = THIS_MODULE;
558 entry->proc_fops = &input_devices_fileops;
559
560 entry = create_proc_entry("handlers", 0, proc_bus_input_dir);
561 if (!entry)
562 goto fail2;
563
564 entry->owner = THIS_MODULE;
565 entry->proc_fops = &input_handlers_fileops;
566
567 return 0;
568
569 fail2: remove_proc_entry("devices", proc_bus_input_dir);
570 fail1: remove_proc_entry("input", proc_bus);
571 return -ENOMEM;
572 }
573
574 static void input_proc_exit(void)
575 {
576 remove_proc_entry("devices", proc_bus_input_dir);
577 remove_proc_entry("handlers", proc_bus_input_dir);
578 remove_proc_entry("input", proc_bus);
579 }
580
581 #else /* !CONFIG_PROC_FS */
582 static inline void input_wakeup_procfs_readers(void) { }
583 static inline int input_proc_init(void) { return 0; }
584 static inline void input_proc_exit(void) { }
585 #endif
586
587 #define INPUT_DEV_STRING_ATTR_SHOW(name) \
588 static ssize_t input_dev_show_##name(struct class_device *dev, char *buf) \
589 { \
590 struct input_dev *input_dev = to_input_dev(dev); \
591 int retval; \
592 \
593 retval = mutex_lock_interruptible(&input_dev->mutex); \
594 if (retval) \
595 return retval; \
596 \
597 retval = scnprintf(buf, PAGE_SIZE, \
598 "%s\n", input_dev->name ? input_dev->name : ""); \
599 \
600 mutex_unlock(&input_dev->mutex); \
601 \
602 return retval; \
603 } \
604 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL);
605
606 INPUT_DEV_STRING_ATTR_SHOW(name);
607 INPUT_DEV_STRING_ATTR_SHOW(phys);
608 INPUT_DEV_STRING_ATTR_SHOW(uniq);
609
610 static int input_print_modalias_bits(char *buf, int size,
611 char name, unsigned long *bm,
612 unsigned int min_bit, unsigned int max_bit)
613 {
614 int len = 0, i;
615
616 len += snprintf(buf, max(size, 0), "%c", name);
617 for (i = min_bit; i < max_bit; i++)
618 if (bm[LONG(i)] & BIT(i))
619 len += snprintf(buf + len, max(size - len, 0), "%X,", i);
620 return len;
621 }
622
623 static int input_print_modalias(char *buf, int size, struct input_dev *id,
624 int add_cr)
625 {
626 int len;
627
628 len = snprintf(buf, max(size, 0),
629 "input:b%04Xv%04Xp%04Xe%04X-",
630 id->id.bustype, id->id.vendor,
631 id->id.product, id->id.version);
632
633 len += input_print_modalias_bits(buf + len, size - len,
634 'e', id->evbit, 0, EV_MAX);
635 len += input_print_modalias_bits(buf + len, size - len,
636 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
637 len += input_print_modalias_bits(buf + len, size - len,
638 'r', id->relbit, 0, REL_MAX);
639 len += input_print_modalias_bits(buf + len, size - len,
640 'a', id->absbit, 0, ABS_MAX);
641 len += input_print_modalias_bits(buf + len, size - len,
642 'm', id->mscbit, 0, MSC_MAX);
643 len += input_print_modalias_bits(buf + len, size - len,
644 'l', id->ledbit, 0, LED_MAX);
645 len += input_print_modalias_bits(buf + len, size - len,
646 's', id->sndbit, 0, SND_MAX);
647 len += input_print_modalias_bits(buf + len, size - len,
648 'f', id->ffbit, 0, FF_MAX);
649 len += input_print_modalias_bits(buf + len, size - len,
650 'w', id->swbit, 0, SW_MAX);
651
652 if (add_cr)
653 len += snprintf(buf + len, max(size - len, 0), "\n");
654
655 return len;
656 }
657
658 static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf)
659 {
660 struct input_dev *id = to_input_dev(dev);
661 ssize_t len;
662
663 len = input_print_modalias(buf, PAGE_SIZE, id, 1);
664
665 return min_t(int, len, PAGE_SIZE);
666 }
667 static CLASS_DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
668
669 static struct attribute *input_dev_attrs[] = {
670 &class_device_attr_name.attr,
671 &class_device_attr_phys.attr,
672 &class_device_attr_uniq.attr,
673 &class_device_attr_modalias.attr,
674 NULL
675 };
676
677 static struct attribute_group input_dev_attr_group = {
678 .attrs = input_dev_attrs,
679 };
680
681 #define INPUT_DEV_ID_ATTR(name) \
682 static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf) \
683 { \
684 struct input_dev *input_dev = to_input_dev(dev); \
685 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
686 } \
687 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL);
688
689 INPUT_DEV_ID_ATTR(bustype);
690 INPUT_DEV_ID_ATTR(vendor);
691 INPUT_DEV_ID_ATTR(product);
692 INPUT_DEV_ID_ATTR(version);
693
694 static struct attribute *input_dev_id_attrs[] = {
695 &class_device_attr_bustype.attr,
696 &class_device_attr_vendor.attr,
697 &class_device_attr_product.attr,
698 &class_device_attr_version.attr,
699 NULL
700 };
701
702 static struct attribute_group input_dev_id_attr_group = {
703 .name = "id",
704 .attrs = input_dev_id_attrs,
705 };
706
707 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
708 int max, int add_cr)
709 {
710 int i;
711 int len = 0;
712
713 for (i = NBITS(max) - 1; i > 0; i--)
714 if (bitmap[i])
715 break;
716
717 for (; i >= 0; i--)
718 len += snprintf(buf + len, max(buf_size - len, 0),
719 "%lx%s", bitmap[i], i > 0 ? " " : "");
720
721 if (add_cr)
722 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
723
724 return len;
725 }
726
727 #define INPUT_DEV_CAP_ATTR(ev, bm) \
728 static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf) \
729 { \
730 struct input_dev *input_dev = to_input_dev(dev); \
731 int len = input_print_bitmap(buf, PAGE_SIZE, \
732 input_dev->bm##bit, ev##_MAX, 1); \
733 return min_t(int, len, PAGE_SIZE); \
734 } \
735 static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL);
736
737 INPUT_DEV_CAP_ATTR(EV, ev);
738 INPUT_DEV_CAP_ATTR(KEY, key);
739 INPUT_DEV_CAP_ATTR(REL, rel);
740 INPUT_DEV_CAP_ATTR(ABS, abs);
741 INPUT_DEV_CAP_ATTR(MSC, msc);
742 INPUT_DEV_CAP_ATTR(LED, led);
743 INPUT_DEV_CAP_ATTR(SND, snd);
744 INPUT_DEV_CAP_ATTR(FF, ff);
745 INPUT_DEV_CAP_ATTR(SW, sw);
746
747 static struct attribute *input_dev_caps_attrs[] = {
748 &class_device_attr_ev.attr,
749 &class_device_attr_key.attr,
750 &class_device_attr_rel.attr,
751 &class_device_attr_abs.attr,
752 &class_device_attr_msc.attr,
753 &class_device_attr_led.attr,
754 &class_device_attr_snd.attr,
755 &class_device_attr_ff.attr,
756 &class_device_attr_sw.attr,
757 NULL
758 };
759
760 static struct attribute_group input_dev_caps_attr_group = {
761 .name = "capabilities",
762 .attrs = input_dev_caps_attrs,
763 };
764
765 static void input_dev_release(struct class_device *class_dev)
766 {
767 struct input_dev *dev = to_input_dev(class_dev);
768
769 input_ff_destroy(dev);
770 kfree(dev);
771
772 module_put(THIS_MODULE);
773 }
774
775 /*
776 * Input uevent interface - loading event handlers based on
777 * device bitfields.
778 */
779 static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index,
780 char *buffer, int buffer_size, int *cur_len,
781 const char *name, unsigned long *bitmap, int max)
782 {
783 if (*cur_index >= num_envp - 1)
784 return -ENOMEM;
785
786 envp[*cur_index] = buffer + *cur_len;
787
788 *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name);
789 if (*cur_len >= buffer_size)
790 return -ENOMEM;
791
792 *cur_len += input_print_bitmap(buffer + *cur_len,
793 max(buffer_size - *cur_len, 0),
794 bitmap, max, 0) + 1;
795 if (*cur_len > buffer_size)
796 return -ENOMEM;
797
798 (*cur_index)++;
799 return 0;
800 }
801
802 static int input_add_uevent_modalias_var(char **envp, int num_envp, int *cur_index,
803 char *buffer, int buffer_size, int *cur_len,
804 struct input_dev *dev)
805 {
806 if (*cur_index >= num_envp - 1)
807 return -ENOMEM;
808
809 envp[*cur_index] = buffer + *cur_len;
810
811 *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0),
812 "MODALIAS=");
813 if (*cur_len >= buffer_size)
814 return -ENOMEM;
815
816 *cur_len += input_print_modalias(buffer + *cur_len,
817 max(buffer_size - *cur_len, 0),
818 dev, 0) + 1;
819 if (*cur_len > buffer_size)
820 return -ENOMEM;
821
822 (*cur_index)++;
823 return 0;
824 }
825
826 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
827 do { \
828 int err = add_uevent_var(envp, num_envp, &i, \
829 buffer, buffer_size, &len, \
830 fmt, val); \
831 if (err) \
832 return err; \
833 } while (0)
834
835 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
836 do { \
837 int err = input_add_uevent_bm_var(envp, num_envp, &i, \
838 buffer, buffer_size, &len, \
839 name, bm, max); \
840 if (err) \
841 return err; \
842 } while (0)
843
844 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
845 do { \
846 int err = input_add_uevent_modalias_var(envp, \
847 num_envp, &i, \
848 buffer, buffer_size, &len, \
849 dev); \
850 if (err) \
851 return err; \
852 } while (0)
853
854 static int input_dev_uevent(struct class_device *cdev, char **envp,
855 int num_envp, char *buffer, int buffer_size)
856 {
857 struct input_dev *dev = to_input_dev(cdev);
858 int i = 0;
859 int len = 0;
860
861 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
862 dev->id.bustype, dev->id.vendor,
863 dev->id.product, dev->id.version);
864 if (dev->name)
865 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
866 if (dev->phys)
867 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
868 if (dev->uniq)
869 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
870
871 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
872 if (test_bit(EV_KEY, dev->evbit))
873 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
874 if (test_bit(EV_REL, dev->evbit))
875 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
876 if (test_bit(EV_ABS, dev->evbit))
877 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
878 if (test_bit(EV_MSC, dev->evbit))
879 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
880 if (test_bit(EV_LED, dev->evbit))
881 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
882 if (test_bit(EV_SND, dev->evbit))
883 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
884 if (test_bit(EV_FF, dev->evbit))
885 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
886 if (test_bit(EV_SW, dev->evbit))
887 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
888
889 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
890
891 envp[i] = NULL;
892 return 0;
893 }
894
895 struct class input_class = {
896 .name = "input",
897 .release = input_dev_release,
898 .uevent = input_dev_uevent,
899 };
900 EXPORT_SYMBOL_GPL(input_class);
901
902 /**
903 * input_allocate_device - allocate memory for new input device
904 *
905 * Returns prepared struct input_dev or NULL.
906 *
907 * NOTE: Use input_free_device() to free devices that have not been
908 * registered; input_unregister_device() should be used for already
909 * registered devices.
910 */
911 struct input_dev *input_allocate_device(void)
912 {
913 struct input_dev *dev;
914
915 dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
916 if (dev) {
917 dev->cdev.class = &input_class;
918 class_device_initialize(&dev->cdev);
919 mutex_init(&dev->mutex);
920 INIT_LIST_HEAD(&dev->h_list);
921 INIT_LIST_HEAD(&dev->node);
922
923 __module_get(THIS_MODULE);
924 }
925
926 return dev;
927 }
928 EXPORT_SYMBOL(input_allocate_device);
929
930 /**
931 * input_free_device - free memory occupied by input_dev structure
932 * @dev: input device to free
933 *
934 * This function should only be used if input_register_device()
935 * was not called yet or if it failed. Once device was registered
936 * use input_unregister_device() and memory will be freed once last
937 * refrence to the device is dropped.
938 *
939 * Device should be allocated by input_allocate_device().
940 *
941 * NOTE: If there are references to the input device then memory
942 * will not be freed until last reference is dropped.
943 */
944 void input_free_device(struct input_dev *dev)
945 {
946 if (dev) {
947
948 mutex_lock(&dev->mutex);
949 dev->name = dev->phys = dev->uniq = NULL;
950 mutex_unlock(&dev->mutex);
951
952 input_put_device(dev);
953 }
954 }
955 EXPORT_SYMBOL(input_free_device);
956
957 int input_register_device(struct input_dev *dev)
958 {
959 static atomic_t input_no = ATOMIC_INIT(0);
960 struct input_handle *handle;
961 struct input_handler *handler;
962 const struct input_device_id *id;
963 const char *path;
964 int error;
965
966 set_bit(EV_SYN, dev->evbit);
967
968 /*
969 * If delay and period are pre-set by the driver, then autorepeating
970 * is handled by the driver itself and we don't do it in input.c.
971 */
972
973 init_timer(&dev->timer);
974 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
975 dev->timer.data = (long) dev;
976 dev->timer.function = input_repeat_key;
977 dev->rep[REP_DELAY] = 250;
978 dev->rep[REP_PERIOD] = 33;
979 }
980
981 list_add_tail(&dev->node, &input_dev_list);
982
983 snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id),
984 "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
985
986 error = class_device_add(&dev->cdev);
987 if (error)
988 return error;
989
990 error = sysfs_create_group(&dev->cdev.kobj, &input_dev_attr_group);
991 if (error)
992 goto fail1;
993
994 error = sysfs_create_group(&dev->cdev.kobj, &input_dev_id_attr_group);
995 if (error)
996 goto fail2;
997
998 error = sysfs_create_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
999 if (error)
1000 goto fail3;
1001
1002 path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
1003 printk(KERN_INFO "input: %s as %s\n",
1004 dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
1005 kfree(path);
1006
1007 list_for_each_entry(handler, &input_handler_list, node)
1008 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
1009 if ((id = input_match_device(handler->id_table, dev)))
1010 if ((handle = handler->connect(handler, dev, id))) {
1011 input_link_handle(handle);
1012 if (handler->start)
1013 handler->start(handle);
1014 }
1015
1016 input_wakeup_procfs_readers();
1017
1018 return 0;
1019
1020 fail3: sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
1021 fail2: sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
1022 fail1: class_device_del(&dev->cdev);
1023 return error;
1024 }
1025 EXPORT_SYMBOL(input_register_device);
1026
1027 void input_unregister_device(struct input_dev *dev)
1028 {
1029 struct list_head *node, *next;
1030 int code;
1031
1032 for (code = 0; code <= KEY_MAX; code++)
1033 if (test_bit(code, dev->key))
1034 input_report_key(dev, code, 0);
1035 input_sync(dev);
1036
1037 del_timer_sync(&dev->timer);
1038
1039 list_for_each_safe(node, next, &dev->h_list) {
1040 struct input_handle * handle = to_handle(node);
1041 list_del_init(&handle->d_node);
1042 list_del_init(&handle->h_node);
1043 handle->handler->disconnect(handle);
1044 }
1045
1046 list_del_init(&dev->node);
1047
1048 sysfs_remove_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
1049 sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
1050 sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
1051
1052 mutex_lock(&dev->mutex);
1053 dev->name = dev->phys = dev->uniq = NULL;
1054 mutex_unlock(&dev->mutex);
1055
1056 class_device_unregister(&dev->cdev);
1057
1058 input_wakeup_procfs_readers();
1059 }
1060 EXPORT_SYMBOL(input_unregister_device);
1061
1062 int input_register_handler(struct input_handler *handler)
1063 {
1064 struct input_dev *dev;
1065 struct input_handle *handle;
1066 const struct input_device_id *id;
1067
1068 INIT_LIST_HEAD(&handler->h_list);
1069
1070 if (handler->fops != NULL) {
1071 if (input_table[handler->minor >> 5])
1072 return -EBUSY;
1073
1074 input_table[handler->minor >> 5] = handler;
1075 }
1076
1077 list_add_tail(&handler->node, &input_handler_list);
1078
1079 list_for_each_entry(dev, &input_dev_list, node)
1080 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
1081 if ((id = input_match_device(handler->id_table, dev)))
1082 if ((handle = handler->connect(handler, dev, id))) {
1083 input_link_handle(handle);
1084 if (handler->start)
1085 handler->start(handle);
1086 }
1087
1088 input_wakeup_procfs_readers();
1089 return 0;
1090 }
1091 EXPORT_SYMBOL(input_register_handler);
1092
1093 void input_unregister_handler(struct input_handler *handler)
1094 {
1095 struct list_head *node, *next;
1096
1097 list_for_each_safe(node, next, &handler->h_list) {
1098 struct input_handle * handle = to_handle_h(node);
1099 list_del_init(&handle->h_node);
1100 list_del_init(&handle->d_node);
1101 handler->disconnect(handle);
1102 }
1103
1104 list_del_init(&handler->node);
1105
1106 if (handler->fops != NULL)
1107 input_table[handler->minor >> 5] = NULL;
1108
1109 input_wakeup_procfs_readers();
1110 }
1111 EXPORT_SYMBOL(input_unregister_handler);
1112
1113 static int input_open_file(struct inode *inode, struct file *file)
1114 {
1115 struct input_handler *handler = input_table[iminor(inode) >> 5];
1116 const struct file_operations *old_fops, *new_fops = NULL;
1117 int err;
1118
1119 /* No load-on-demand here? */
1120 if (!handler || !(new_fops = fops_get(handler->fops)))
1121 return -ENODEV;
1122
1123 /*
1124 * That's _really_ odd. Usually NULL ->open means "nothing special",
1125 * not "no device". Oh, well...
1126 */
1127 if (!new_fops->open) {
1128 fops_put(new_fops);
1129 return -ENODEV;
1130 }
1131 old_fops = file->f_op;
1132 file->f_op = new_fops;
1133
1134 err = new_fops->open(inode, file);
1135
1136 if (err) {
1137 fops_put(file->f_op);
1138 file->f_op = fops_get(old_fops);
1139 }
1140 fops_put(old_fops);
1141 return err;
1142 }
1143
1144 static const struct file_operations input_fops = {
1145 .owner = THIS_MODULE,
1146 .open = input_open_file,
1147 };
1148
1149 static int __init input_init(void)
1150 {
1151 int err;
1152
1153 err = class_register(&input_class);
1154 if (err) {
1155 printk(KERN_ERR "input: unable to register input_dev class\n");
1156 return err;
1157 }
1158
1159 err = input_proc_init();
1160 if (err)
1161 goto fail1;
1162
1163 err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
1164 if (err) {
1165 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
1166 goto fail2;
1167 }
1168
1169 return 0;
1170
1171 fail2: input_proc_exit();
1172 fail1: class_unregister(&input_class);
1173 return err;
1174 }
1175
1176 static void __exit input_exit(void)
1177 {
1178 input_proc_exit();
1179 unregister_chrdev(INPUT_MAJOR, "input");
1180 class_unregister(&input_class);
1181 }
1182
1183 subsys_initcall(input_init);
1184 module_exit(input_exit);
Linux kernel - Deliverables
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