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Complete the renaming to TuxOnIce with function names, vars etc.
[linux-2.6/suspend2-head.git] / drivers / input / input.c
blob75b4d2a83dd99ff842308e1a96400cd809aac383
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/input.h>
15 #include <linux/module.h>
16 #include <linux/random.h>
17 #include <linux/major.h>
18 #include <linux/proc_fs.h>
19 #include <linux/seq_file.h>
20 #include <linux/interrupt.h>
21 #include <linux/poll.h>
22 #include <linux/device.h>
23 #include <linux/mutex.h>
24
25 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
26 MODULE_DESCRIPTION("Input core");
27 MODULE_LICENSE("GPL");
28
29 #define INPUT_DEVICES 256
30
31 static LIST_HEAD(input_dev_list);
32 static LIST_HEAD(input_handler_list);
33
34 static struct input_handler *input_table[8];
35
36 /**
37 * input_event() - report new input event
38 * @dev: device that generated the event
39 * @type: type of the event
40 * @code: event code
41 * @value: value of the event
42 *
43 * This function should be used by drivers implementing various input devices
44 * See also input_inject_event()
45 */
46 void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
47 {
48 struct input_handle *handle;
49
50 if (type > EV_MAX || !test_bit(type, dev->evbit))
51 return;
52
53 add_input_randomness(type, code, value);
54
55 switch (type) {
56
57 case EV_SYN:
58 switch (code) {
59 case SYN_CONFIG:
60 if (dev->event)
61 dev->event(dev, type, code, value);
62 break;
63
64 case SYN_REPORT:
65 if (dev->sync)
66 return;
67 dev->sync = 1;
68 break;
69 }
70 break;
71
72 case EV_KEY:
73
74 if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value)
75 return;
76
77 if (value == 2)
78 break;
79
80 change_bit(code, dev->key);
81
82 if (test_bit(EV_REP, dev->evbit) && dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && dev->timer.data && value) {
83 dev->repeat_key = code;
84 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
85 }
86
87 break;
88
89 case EV_SW:
90
91 if (code > SW_MAX || !test_bit(code, dev->swbit) || !!test_bit(code, dev->sw) == value)
92 return;
93
94 change_bit(code, dev->sw);
95
96 break;
97
98 case EV_ABS:
99
100 if (code > ABS_MAX || !test_bit(code, dev->absbit))
101 return;
102
103 if (dev->absfuzz[code]) {
104 if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) &&
105 (value < dev->abs[code] + (dev->absfuzz[code] >> 1)))
106 return;
107
108 if ((value > dev->abs[code] - dev->absfuzz[code]) &&
109 (value < dev->abs[code] + dev->absfuzz[code]))
110 value = (dev->abs[code] * 3 + value) >> 2;
111
112 if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) &&
113 (value < dev->abs[code] + (dev->absfuzz[code] << 1)))
114 value = (dev->abs[code] + value) >> 1;
115 }
116
117 if (dev->abs[code] == value)
118 return;
119
120 dev->abs[code] = value;
121 break;
122
123 case EV_REL:
124
125 if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0))
126 return;
127
128 break;
129
130 case EV_MSC:
131
132 if (code > MSC_MAX || !test_bit(code, dev->mscbit))
133 return;
134
135 if (dev->event)
136 dev->event(dev, type, code, value);
137
138 break;
139
140 case EV_LED:
141
142 if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value)
143 return;
144
145 change_bit(code, dev->led);
146
147 if (dev->event)
148 dev->event(dev, type, code, value);
149
150 break;
151
152 case EV_SND:
153
154 if (code > SND_MAX || !test_bit(code, dev->sndbit))
155 return;
156
157 if (!!test_bit(code, dev->snd) != !!value)
158 change_bit(code, dev->snd);
159
160 if (dev->event)
161 dev->event(dev, type, code, value);
162
163 break;
164
165 case EV_REP:
166
167 if (code > REP_MAX || value < 0 || dev->rep[code] == value)
168 return;
169
170 dev->rep[code] = value;
171 if (dev->event)
172 dev->event(dev, type, code, value);
173
174 break;
175
176 case EV_FF:
177
178 if (value < 0)
179 return;
180
181 if (dev->event)
182 dev->event(dev, type, code, value);
183 break;
184 }
185
186 if (type != EV_SYN)
187 dev->sync = 0;
188
189 if (dev->grab)
190 dev->grab->handler->event(dev->grab, type, code, value);
191 else
192 list_for_each_entry(handle, &dev->h_list, d_node)
193 if (handle->open)
194 handle->handler->event(handle, type, code, value);
195 }
196 EXPORT_SYMBOL(input_event);
197
198 /**
199 * input_inject_event() - send input event from input handler
200 * @handle: input handle to send event through
201 * @type: type of the event
202 * @code: event code
203 * @value: value of the event
204 *
205 * Similar to input_event() but will ignore event if device is "grabbed" and handle
206 * injecting event is not the one that owns the device.
207 */
208 void input_inject_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
209 {
210 if (!handle->dev->grab || handle->dev->grab == handle)
211 input_event(handle->dev, type, code, value);
212 }
213 EXPORT_SYMBOL(input_inject_event);
214
215 static void input_repeat_key(unsigned long data)
216 {
217 struct input_dev *dev = (void *) data;
218
219 if (!test_bit(dev->repeat_key, dev->key))
220 return;
221
222 input_event(dev, EV_KEY, dev->repeat_key, 2);
223 input_sync(dev);
224
225 if (dev->rep[REP_PERIOD])
226 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD]));
227 }
228
229 int input_grab_device(struct input_handle *handle)
230 {
231 if (handle->dev->grab)
232 return -EBUSY;
233
234 handle->dev->grab = handle;
235 return 0;
236 }
237 EXPORT_SYMBOL(input_grab_device);
238
239 void input_release_device(struct input_handle *handle)
240 {
241 struct input_dev *dev = handle->dev;
242
243 if (dev->grab == handle) {
244 dev->grab = NULL;
245
246 list_for_each_entry(handle, &dev->h_list, d_node)
247 if (handle->handler->start)
248 handle->handler->start(handle);
249 }
250 }
251 EXPORT_SYMBOL(input_release_device);
252
253 int input_open_device(struct input_handle *handle)
254 {
255 struct input_dev *dev = handle->dev;
256 int err;
257
258 err = mutex_lock_interruptible(&dev->mutex);
259 if (err)
260 return err;
261
262 handle->open++;
263
264 if (!dev->users++ && dev->open)
265 err = dev->open(dev);
266
267 if (err)
268 handle->open--;
269
270 mutex_unlock(&dev->mutex);
271
272 return err;
273 }
274 EXPORT_SYMBOL(input_open_device);
275
276 int input_flush_device(struct input_handle* handle, struct file* file)
277 {
278 if (handle->dev->flush)
279 return handle->dev->flush(handle->dev, file);
280
281 return 0;
282 }
283 EXPORT_SYMBOL(input_flush_device);
284
285 void input_close_device(struct input_handle *handle)
286 {
287 struct input_dev *dev = handle->dev;
288
289 input_release_device(handle);
290
291 mutex_lock(&dev->mutex);
292
293 if (!--dev->users && dev->close)
294 dev->close(dev);
295 handle->open--;
296
297 mutex_unlock(&dev->mutex);
298 }
299 EXPORT_SYMBOL(input_close_device);
300
301 static int input_fetch_keycode(struct input_dev *dev, int scancode)
302 {
303 switch (dev->keycodesize) {
304 case 1:
305 return ((u8 *)dev->keycode)[scancode];
306
307 case 2:
308 return ((u16 *)dev->keycode)[scancode];
309
310 default:
311 return ((u32 *)dev->keycode)[scancode];
312 }
313 }
314
315 static int input_default_getkeycode(struct input_dev *dev,
316 int scancode, int *keycode)
317 {
318 if (!dev->keycodesize)
319 return -EINVAL;
320
321 if (scancode < 0 || scancode >= dev->keycodemax)
322 return -EINVAL;
323
324 *keycode = input_fetch_keycode(dev, scancode);
325
326 return 0;
327 }
328
329 static int input_default_setkeycode(struct input_dev *dev,
330 int scancode, int keycode)
331 {
332 int old_keycode;
333 int i;
334
335 if (scancode < 0 || scancode >= dev->keycodemax)
336 return -EINVAL;
337
338 if (keycode < 0 || keycode > KEY_MAX)
339 return -EINVAL;
340
341 if (!dev->keycodesize)
342 return -EINVAL;
343
344 if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8)))
345 return -EINVAL;
346
347 switch (dev->keycodesize) {
348 case 1: {
349 u8 *k = (u8 *)dev->keycode;
350 old_keycode = k[scancode];
351 k[scancode] = keycode;
352 break;
353 }
354 case 2: {
355 u16 *k = (u16 *)dev->keycode;
356 old_keycode = k[scancode];
357 k[scancode] = keycode;
358 break;
359 }
360 default: {
361 u32 *k = (u32 *)dev->keycode;
362 old_keycode = k[scancode];
363 k[scancode] = keycode;
364 break;
365 }
366 }
367
368 clear_bit(old_keycode, dev->keybit);
369 set_bit(keycode, dev->keybit);
370
371 for (i = 0; i < dev->keycodemax; i++) {
372 if (input_fetch_keycode(dev, i) == old_keycode) {
373 set_bit(old_keycode, dev->keybit);
374 break; /* Setting the bit twice is useless, so break */
375 }
376 }
377
378 return 0;
379 }
380
381
382 #define MATCH_BIT(bit, max) \
383 for (i = 0; i < NBITS(max); i++) \
384 if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
385 break; \
386 if (i != NBITS(max)) \
387 continue;
388
389 static const struct input_device_id *input_match_device(const struct input_device_id *id,
390 struct input_dev *dev)
391 {
392 int i;
393
394 for (; id->flags || id->driver_info; id++) {
395
396 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
397 if (id->bustype != dev->id.bustype)
398 continue;
399
400 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
401 if (id->vendor != dev->id.vendor)
402 continue;
403
404 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
405 if (id->product != dev->id.product)
406 continue;
407
408 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
409 if (id->version != dev->id.version)
410 continue;
411
412 MATCH_BIT(evbit, EV_MAX);
413 MATCH_BIT(keybit, KEY_MAX);
414 MATCH_BIT(relbit, REL_MAX);
415 MATCH_BIT(absbit, ABS_MAX);
416 MATCH_BIT(mscbit, MSC_MAX);
417 MATCH_BIT(ledbit, LED_MAX);
418 MATCH_BIT(sndbit, SND_MAX);
419 MATCH_BIT(ffbit, FF_MAX);
420 MATCH_BIT(swbit, SW_MAX);
421
422 return id;
423 }
424
425 return NULL;
426 }
427
428 static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
429 {
430 const struct input_device_id *id;
431 int error;
432
433 if (handler->blacklist && input_match_device(handler->blacklist, dev))
434 return -ENODEV;
435
436 id = input_match_device(handler->id_table, dev);
437 if (!id)
438 return -ENODEV;
439
440 error = handler->connect(handler, dev, id);
441 if (error && error != -ENODEV)
442 printk(KERN_ERR
443 "input: failed to attach handler %s to device %s, "
444 "error: %d\n",
445 handler->name, kobject_name(&dev->dev.kobj), error);
446
447 return error;
448 }
449
450
451 #ifdef CONFIG_PROC_FS
452
453 static struct proc_dir_entry *proc_bus_input_dir;
454 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
455 static int input_devices_state;
456
457 static inline void input_wakeup_procfs_readers(void)
458 {
459 input_devices_state++;
460 wake_up(&input_devices_poll_wait);
461 }
462
463 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
464 {
465 int state = input_devices_state;
466
467 poll_wait(file, &input_devices_poll_wait, wait);
468 if (state != input_devices_state)
469 return POLLIN | POLLRDNORM;
470
471 return 0;
472 }
473
474 static struct list_head *list_get_nth_element(struct list_head *list, loff_t *pos)
475 {
476 struct list_head *node;
477 loff_t i = 0;
478
479 list_for_each(node, list)
480 if (i++ == *pos)
481 return node;
482
483 return NULL;
484 }
485
486 static struct list_head *list_get_next_element(struct list_head *list, struct list_head *element, loff_t *pos)
487 {
488 if (element->next == list)
489 return NULL;
490
491 ++(*pos);
492 return element->next;
493 }
494
495 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
496 {
497 /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
498
499 return list_get_nth_element(&input_dev_list, pos);
500 }
501
502 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
503 {
504 return list_get_next_element(&input_dev_list, v, pos);
505 }
506
507 static void input_devices_seq_stop(struct seq_file *seq, void *v)
508 {
509 /* release lock here */
510 }
511
512 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
513 unsigned long *bitmap, int max)
514 {
515 int i;
516
517 for (i = NBITS(max) - 1; i > 0; i--)
518 if (bitmap[i])
519 break;
520
521 seq_printf(seq, "B: %s=", name);
522 for (; i >= 0; i--)
523 seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : "");
524 seq_putc(seq, '\n');
525 }
526
527 static int input_devices_seq_show(struct seq_file *seq, void *v)
528 {
529 struct input_dev *dev = container_of(v, struct input_dev, node);
530 const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
531 struct input_handle *handle;
532
533 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
534 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
535
536 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
537 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
538 seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
539 seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
540 seq_printf(seq, "H: Handlers=");
541
542 list_for_each_entry(handle, &dev->h_list, d_node)
543 seq_printf(seq, "%s ", handle->name);
544 seq_putc(seq, '\n');
545
546 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
547 if (test_bit(EV_KEY, dev->evbit))
548 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
549 if (test_bit(EV_REL, dev->evbit))
550 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
551 if (test_bit(EV_ABS, dev->evbit))
552 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
553 if (test_bit(EV_MSC, dev->evbit))
554 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
555 if (test_bit(EV_LED, dev->evbit))
556 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
557 if (test_bit(EV_SND, dev->evbit))
558 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
559 if (test_bit(EV_FF, dev->evbit))
560 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
561 if (test_bit(EV_SW, dev->evbit))
562 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
563
564 seq_putc(seq, '\n');
565
566 kfree(path);
567 return 0;
568 }
569
570 static struct seq_operations input_devices_seq_ops = {
571 .start = input_devices_seq_start,
572 .next = input_devices_seq_next,
573 .stop = input_devices_seq_stop,
574 .show = input_devices_seq_show,
575 };
576
577 static int input_proc_devices_open(struct inode *inode, struct file *file)
578 {
579 return seq_open(file, &input_devices_seq_ops);
580 }
581
582 static const struct file_operations input_devices_fileops = {
583 .owner = THIS_MODULE,
584 .open = input_proc_devices_open,
585 .poll = input_proc_devices_poll,
586 .read = seq_read,
587 .llseek = seq_lseek,
588 .release = seq_release,
589 };
590
591 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
592 {
593 /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
594 seq->private = (void *)(unsigned long)*pos;
595 return list_get_nth_element(&input_handler_list, pos);
596 }
597
598 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
599 {
600 seq->private = (void *)(unsigned long)(*pos + 1);
601 return list_get_next_element(&input_handler_list, v, pos);
602 }
603
604 static void input_handlers_seq_stop(struct seq_file *seq, void *v)
605 {
606 /* release lock here */
607 }
608
609 static int input_handlers_seq_show(struct seq_file *seq, void *v)
610 {
611 struct input_handler *handler = container_of(v, struct input_handler, node);
612
613 seq_printf(seq, "N: Number=%ld Name=%s",
614 (unsigned long)seq->private, handler->name);
615 if (handler->fops)
616 seq_printf(seq, " Minor=%d", handler->minor);
617 seq_putc(seq, '\n');
618
619 return 0;
620 }
621 static struct seq_operations input_handlers_seq_ops = {
622 .start = input_handlers_seq_start,
623 .next = input_handlers_seq_next,
624 .stop = input_handlers_seq_stop,
625 .show = input_handlers_seq_show,
626 };
627
628 static int input_proc_handlers_open(struct inode *inode, struct file *file)
629 {
630 return seq_open(file, &input_handlers_seq_ops);
631 }
632
633 static const struct file_operations input_handlers_fileops = {
634 .owner = THIS_MODULE,
635 .open = input_proc_handlers_open,
636 .read = seq_read,
637 .llseek = seq_lseek,
638 .release = seq_release,
639 };
640
641 static int __init input_proc_init(void)
642 {
643 struct proc_dir_entry *entry;
644
645 proc_bus_input_dir = proc_mkdir("input", proc_bus);
646 if (!proc_bus_input_dir)
647 return -ENOMEM;
648
649 proc_bus_input_dir->owner = THIS_MODULE;
650
651 entry = create_proc_entry("devices", 0, proc_bus_input_dir);
652 if (!entry)
653 goto fail1;
654
655 entry->owner = THIS_MODULE;
656 entry->proc_fops = &input_devices_fileops;
657
658 entry = create_proc_entry("handlers", 0, proc_bus_input_dir);
659 if (!entry)
660 goto fail2;
661
662 entry->owner = THIS_MODULE;
663 entry->proc_fops = &input_handlers_fileops;
664
665 return 0;
666
667 fail2: remove_proc_entry("devices", proc_bus_input_dir);
668 fail1: remove_proc_entry("input", proc_bus);
669 return -ENOMEM;
670 }
671
672 static void input_proc_exit(void)
673 {
674 remove_proc_entry("devices", proc_bus_input_dir);
675 remove_proc_entry("handlers", proc_bus_input_dir);
676 remove_proc_entry("input", proc_bus);
677 }
678
679 #else /* !CONFIG_PROC_FS */
680 static inline void input_wakeup_procfs_readers(void) { }
681 static inline int input_proc_init(void) { return 0; }
682 static inline void input_proc_exit(void) { }
683 #endif
684
685 #define INPUT_DEV_STRING_ATTR_SHOW(name) \
686 static ssize_t input_dev_show_##name(struct device *dev, \
687 struct device_attribute *attr, \
688 char *buf) \
689 { \
690 struct input_dev *input_dev = to_input_dev(dev); \
691 \
692 return scnprintf(buf, PAGE_SIZE, "%s\n", \
693 input_dev->name ? input_dev->name : ""); \
694 } \
695 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
696
697 INPUT_DEV_STRING_ATTR_SHOW(name);
698 INPUT_DEV_STRING_ATTR_SHOW(phys);
699 INPUT_DEV_STRING_ATTR_SHOW(uniq);
700
701 static int input_print_modalias_bits(char *buf, int size,
702 char name, unsigned long *bm,
703 unsigned int min_bit, unsigned int max_bit)
704 {
705 int len = 0, i;
706
707 len += snprintf(buf, max(size, 0), "%c", name);
708 for (i = min_bit; i < max_bit; i++)
709 if (bm[LONG(i)] & BIT(i))
710 len += snprintf(buf + len, max(size - len, 0), "%X,", i);
711 return len;
712 }
713
714 static int input_print_modalias(char *buf, int size, struct input_dev *id,
715 int add_cr)
716 {
717 int len;
718
719 len = snprintf(buf, max(size, 0),
720 "input:b%04Xv%04Xp%04Xe%04X-",
721 id->id.bustype, id->id.vendor,
722 id->id.product, id->id.version);
723
724 len += input_print_modalias_bits(buf + len, size - len,
725 'e', id->evbit, 0, EV_MAX);
726 len += input_print_modalias_bits(buf + len, size - len,
727 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
728 len += input_print_modalias_bits(buf + len, size - len,
729 'r', id->relbit, 0, REL_MAX);
730 len += input_print_modalias_bits(buf + len, size - len,
731 'a', id->absbit, 0, ABS_MAX);
732 len += input_print_modalias_bits(buf + len, size - len,
733 'm', id->mscbit, 0, MSC_MAX);
734 len += input_print_modalias_bits(buf + len, size - len,
735 'l', id->ledbit, 0, LED_MAX);
736 len += input_print_modalias_bits(buf + len, size - len,
737 's', id->sndbit, 0, SND_MAX);
738 len += input_print_modalias_bits(buf + len, size - len,
739 'f', id->ffbit, 0, FF_MAX);
740 len += input_print_modalias_bits(buf + len, size - len,
741 'w', id->swbit, 0, SW_MAX);
742
743 if (add_cr)
744 len += snprintf(buf + len, max(size - len, 0), "\n");
745
746 return len;
747 }
748
749 static ssize_t input_dev_show_modalias(struct device *dev,
750 struct device_attribute *attr,
751 char *buf)
752 {
753 struct input_dev *id = to_input_dev(dev);
754 ssize_t len;
755
756 len = input_print_modalias(buf, PAGE_SIZE, id, 1);
757
758 return min_t(int, len, PAGE_SIZE);
759 }
760 static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
761
762 static struct attribute *input_dev_attrs[] = {
763 &dev_attr_name.attr,
764 &dev_attr_phys.attr,
765 &dev_attr_uniq.attr,
766 &dev_attr_modalias.attr,
767 NULL
768 };
769
770 static struct attribute_group input_dev_attr_group = {
771 .attrs = input_dev_attrs,
772 };
773
774 #define INPUT_DEV_ID_ATTR(name) \
775 static ssize_t input_dev_show_id_##name(struct device *dev, \
776 struct device_attribute *attr, \
777 char *buf) \
778 { \
779 struct input_dev *input_dev = to_input_dev(dev); \
780 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
781 } \
782 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
783
784 INPUT_DEV_ID_ATTR(bustype);
785 INPUT_DEV_ID_ATTR(vendor);
786 INPUT_DEV_ID_ATTR(product);
787 INPUT_DEV_ID_ATTR(version);
788
789 static struct attribute *input_dev_id_attrs[] = {
790 &dev_attr_bustype.attr,
791 &dev_attr_vendor.attr,
792 &dev_attr_product.attr,
793 &dev_attr_version.attr,
794 NULL
795 };
796
797 static struct attribute_group input_dev_id_attr_group = {
798 .name = "id",
799 .attrs = input_dev_id_attrs,
800 };
801
802 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
803 int max, int add_cr)
804 {
805 int i;
806 int len = 0;
807
808 for (i = NBITS(max) - 1; i > 0; i--)
809 if (bitmap[i])
810 break;
811
812 for (; i >= 0; i--)
813 len += snprintf(buf + len, max(buf_size - len, 0),
814 "%lx%s", bitmap[i], i > 0 ? " " : "");
815
816 if (add_cr)
817 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
818
819 return len;
820 }
821
822 #define INPUT_DEV_CAP_ATTR(ev, bm) \
823 static ssize_t input_dev_show_cap_##bm(struct device *dev, \
824 struct device_attribute *attr, \
825 char *buf) \
826 { \
827 struct input_dev *input_dev = to_input_dev(dev); \
828 int len = input_print_bitmap(buf, PAGE_SIZE, \
829 input_dev->bm##bit, ev##_MAX, 1); \
830 return min_t(int, len, PAGE_SIZE); \
831 } \
832 static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
833
834 INPUT_DEV_CAP_ATTR(EV, ev);
835 INPUT_DEV_CAP_ATTR(KEY, key);
836 INPUT_DEV_CAP_ATTR(REL, rel);
837 INPUT_DEV_CAP_ATTR(ABS, abs);
838 INPUT_DEV_CAP_ATTR(MSC, msc);
839 INPUT_DEV_CAP_ATTR(LED, led);
840 INPUT_DEV_CAP_ATTR(SND, snd);
841 INPUT_DEV_CAP_ATTR(FF, ff);
842 INPUT_DEV_CAP_ATTR(SW, sw);
843
844 static struct attribute *input_dev_caps_attrs[] = {
845 &dev_attr_ev.attr,
846 &dev_attr_key.attr,
847 &dev_attr_rel.attr,
848 &dev_attr_abs.attr,
849 &dev_attr_msc.attr,
850 &dev_attr_led.attr,
851 &dev_attr_snd.attr,
852 &dev_attr_ff.attr,
853 &dev_attr_sw.attr,
854 NULL
855 };
856
857 static struct attribute_group input_dev_caps_attr_group = {
858 .name = "capabilities",
859 .attrs = input_dev_caps_attrs,
860 };
861
862 static struct attribute_group *input_dev_attr_groups[] = {
863 &input_dev_attr_group,
864 &input_dev_id_attr_group,
865 &input_dev_caps_attr_group,
866 NULL
867 };
868
869 static void input_dev_release(struct device *device)
870 {
871 struct input_dev *dev = to_input_dev(device);
872
873 input_ff_destroy(dev);
874 kfree(dev);
875
876 module_put(THIS_MODULE);
877 }
878
879 /*
880 * Input uevent interface - loading event handlers based on
881 * device bitfields.
882 */
883 static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index,
884 char *buffer, int buffer_size, int *cur_len,
885 const char *name, unsigned long *bitmap, int max)
886 {
887 if (*cur_index >= num_envp - 1)
888 return -ENOMEM;
889
890 envp[*cur_index] = buffer + *cur_len;
891
892 *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name);
893 if (*cur_len >= buffer_size)
894 return -ENOMEM;
895
896 *cur_len += input_print_bitmap(buffer + *cur_len,
897 max(buffer_size - *cur_len, 0),
898 bitmap, max, 0) + 1;
899 if (*cur_len > buffer_size)
900 return -ENOMEM;
901
902 (*cur_index)++;
903 return 0;
904 }
905
906 static int input_add_uevent_modalias_var(char **envp, int num_envp, int *cur_index,
907 char *buffer, int buffer_size, int *cur_len,
908 struct input_dev *dev)
909 {
910 if (*cur_index >= num_envp - 1)
911 return -ENOMEM;
912
913 envp[*cur_index] = buffer + *cur_len;
914
915 *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0),
916 "MODALIAS=");
917 if (*cur_len >= buffer_size)
918 return -ENOMEM;
919
920 *cur_len += input_print_modalias(buffer + *cur_len,
921 max(buffer_size - *cur_len, 0),
922 dev, 0) + 1;
923 if (*cur_len > buffer_size)
924 return -ENOMEM;
925
926 (*cur_index)++;
927 return 0;
928 }
929
930 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
931 do { \
932 int err = add_uevent_var(envp, num_envp, &i, \
933 buffer, buffer_size, &len, \
934 fmt, val); \
935 if (err) \
936 return err; \
937 } while (0)
938
939 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
940 do { \
941 int err = input_add_uevent_bm_var(envp, num_envp, &i, \
942 buffer, buffer_size, &len, \
943 name, bm, max); \
944 if (err) \
945 return err; \
946 } while (0)
947
948 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
949 do { \
950 int err = input_add_uevent_modalias_var(envp, \
951 num_envp, &i, \
952 buffer, buffer_size, &len, \
953 dev); \
954 if (err) \
955 return err; \
956 } while (0)
957
958 static int input_dev_uevent(struct device *device, char **envp,
959 int num_envp, char *buffer, int buffer_size)
960 {
961 struct input_dev *dev = to_input_dev(device);
962 int i = 0;
963 int len = 0;
964
965 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
966 dev->id.bustype, dev->id.vendor,
967 dev->id.product, dev->id.version);
968 if (dev->name)
969 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
970 if (dev->phys)
971 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
972 if (dev->uniq)
973 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
974
975 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
976 if (test_bit(EV_KEY, dev->evbit))
977 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
978 if (test_bit(EV_REL, dev->evbit))
979 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
980 if (test_bit(EV_ABS, dev->evbit))
981 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
982 if (test_bit(EV_MSC, dev->evbit))
983 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
984 if (test_bit(EV_LED, dev->evbit))
985 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
986 if (test_bit(EV_SND, dev->evbit))
987 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
988 if (test_bit(EV_FF, dev->evbit))
989 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
990 if (test_bit(EV_SW, dev->evbit))
991 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
992
993 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
994
995 envp[i] = NULL;
996 return 0;
997 }
998
999 static struct device_type input_dev_type = {
1000 .groups = input_dev_attr_groups,
1001 .release = input_dev_release,
1002 .uevent = input_dev_uevent,
1003 };
1004
1005 struct class input_class = {
1006 .name = "input",
1007 };
1008 EXPORT_SYMBOL_GPL(input_class);
1009
1010 /**
1011 * input_allocate_device - allocate memory for new input device
1012 *
1013 * Returns prepared struct input_dev or NULL.
1014 *
1015 * NOTE: Use input_free_device() to free devices that have not been
1016 * registered; input_unregister_device() should be used for already
1017 * registered devices.
1018 */
1019 struct input_dev *input_allocate_device(void)
1020 {
1021 struct input_dev *dev;
1022
1023 dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
1024 if (dev) {
1025 dev->dev.type = &input_dev_type;
1026 dev->dev.class = &input_class;
1027 device_initialize(&dev->dev);
1028 mutex_init(&dev->mutex);
1029 INIT_LIST_HEAD(&dev->h_list);
1030 INIT_LIST_HEAD(&dev->node);
1031
1032 __module_get(THIS_MODULE);
1033 }
1034
1035 return dev;
1036 }
1037 EXPORT_SYMBOL(input_allocate_device);
1038
1039 /**
1040 * input_free_device - free memory occupied by input_dev structure
1041 * @dev: input device to free
1042 *
1043 * This function should only be used if input_register_device()
1044 * was not called yet or if it failed. Once device was registered
1045 * use input_unregister_device() and memory will be freed once last
1046 * refrence to the device is dropped.
1047 *
1048 * Device should be allocated by input_allocate_device().
1049 *
1050 * NOTE: If there are references to the input device then memory
1051 * will not be freed until last reference is dropped.
1052 */
1053 void input_free_device(struct input_dev *dev)
1054 {
1055 if (dev)
1056 input_put_device(dev);
1057 }
1058 EXPORT_SYMBOL(input_free_device);
1059
1060 /**
1061 * input_set_capability - mark device as capable of a certain event
1062 * @dev: device that is capable of emitting or accepting event
1063 * @type: type of the event (EV_KEY, EV_REL, etc...)
1064 * @code: event code
1065 *
1066 * In addition to setting up corresponding bit in appropriate capability
1067 * bitmap the function also adjusts dev->evbit.
1068 */
1069 void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
1070 {
1071 switch (type) {
1072 case EV_KEY:
1073 __set_bit(code, dev->keybit);
1074 break;
1075
1076 case EV_REL:
1077 __set_bit(code, dev->relbit);
1078 break;
1079
1080 case EV_ABS:
1081 __set_bit(code, dev->absbit);
1082 break;
1083
1084 case EV_MSC:
1085 __set_bit(code, dev->mscbit);
1086 break;
1087
1088 case EV_SW:
1089 __set_bit(code, dev->swbit);
1090 break;
1091
1092 case EV_LED:
1093 __set_bit(code, dev->ledbit);
1094 break;
1095
1096 case EV_SND:
1097 __set_bit(code, dev->sndbit);
1098 break;
1099
1100 case EV_FF:
1101 __set_bit(code, dev->ffbit);
1102 break;
1103
1104 default:
1105 printk(KERN_ERR
1106 "input_set_capability: unknown type %u (code %u)\n",
1107 type, code);
1108 dump_stack();
1109 return;
1110 }
1111
1112 __set_bit(type, dev->evbit);
1113 }
1114 EXPORT_SYMBOL(input_set_capability);
1115
1116 int input_register_device(struct input_dev *dev)
1117 {
1118 static atomic_t input_no = ATOMIC_INIT(0);
1119 struct input_handler *handler;
1120 const char *path;
1121 int error;
1122
1123 set_bit(EV_SYN, dev->evbit);
1124
1125 /*
1126 * If delay and period are pre-set by the driver, then autorepeating
1127 * is handled by the driver itself and we don't do it in input.c.
1128 */
1129
1130 init_timer(&dev->timer);
1131 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
1132 dev->timer.data = (long) dev;
1133 dev->timer.function = input_repeat_key;
1134 dev->rep[REP_DELAY] = 250;
1135 dev->rep[REP_PERIOD] = 33;
1136 }
1137
1138 if (!dev->getkeycode)
1139 dev->getkeycode = input_default_getkeycode;
1140
1141 if (!dev->setkeycode)
1142 dev->setkeycode = input_default_setkeycode;
1143
1144 list_add_tail(&dev->node, &input_dev_list);
1145
1146 snprintf(dev->dev.bus_id, sizeof(dev->dev.bus_id),
1147 "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
1148
1149 if (dev->cdev.dev)
1150 dev->dev.parent = dev->cdev.dev;
1151
1152 error = device_add(&dev->dev);
1153 if (error)
1154 return error;
1155
1156 path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
1157 printk(KERN_INFO "input: %s as %s\n",
1158 dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
1159 kfree(path);
1160
1161 list_for_each_entry(handler, &input_handler_list, node)
1162 input_attach_handler(dev, handler);
1163
1164 input_wakeup_procfs_readers();
1165
1166 return 0;
1167 }
1168 EXPORT_SYMBOL(input_register_device);
1169
1170 void input_unregister_device(struct input_dev *dev)
1171 {
1172 struct input_handle *handle, *next;
1173 int code;
1174
1175 for (code = 0; code <= KEY_MAX; code++)
1176 if (test_bit(code, dev->key))
1177 input_report_key(dev, code, 0);
1178 input_sync(dev);
1179
1180 del_timer_sync(&dev->timer);
1181
1182 list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
1183 handle->handler->disconnect(handle);
1184 WARN_ON(!list_empty(&dev->h_list));
1185
1186 list_del_init(&dev->node);
1187
1188 device_unregister(&dev->dev);
1189
1190 input_wakeup_procfs_readers();
1191 }
1192 EXPORT_SYMBOL(input_unregister_device);
1193
1194 int input_register_handler(struct input_handler *handler)
1195 {
1196 struct input_dev *dev;
1197
1198 INIT_LIST_HEAD(&handler->h_list);
1199
1200 if (handler->fops != NULL) {
1201 if (input_table[handler->minor >> 5])
1202 return -EBUSY;
1203
1204 input_table[handler->minor >> 5] = handler;
1205 }
1206
1207 list_add_tail(&handler->node, &input_handler_list);
1208
1209 list_for_each_entry(dev, &input_dev_list, node)
1210 input_attach_handler(dev, handler);
1211
1212 input_wakeup_procfs_readers();
1213 return 0;
1214 }
1215 EXPORT_SYMBOL(input_register_handler);
1216
1217 void input_unregister_handler(struct input_handler *handler)
1218 {
1219 struct input_handle *handle, *next;
1220
1221 list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
1222 handler->disconnect(handle);
1223 WARN_ON(!list_empty(&handler->h_list));
1224
1225 list_del_init(&handler->node);
1226
1227 if (handler->fops != NULL)
1228 input_table[handler->minor >> 5] = NULL;
1229
1230 input_wakeup_procfs_readers();
1231 }
1232 EXPORT_SYMBOL(input_unregister_handler);
1233
1234 int input_register_handle(struct input_handle *handle)
1235 {
1236 struct input_handler *handler = handle->handler;
1237
1238 list_add_tail(&handle->d_node, &handle->dev->h_list);
1239 list_add_tail(&handle->h_node, &handler->h_list);
1240
1241 if (handler->start)
1242 handler->start(handle);
1243
1244 return 0;
1245 }
1246 EXPORT_SYMBOL(input_register_handle);
1247
1248 void input_unregister_handle(struct input_handle *handle)
1249 {
1250 list_del_init(&handle->h_node);
1251 list_del_init(&handle->d_node);
1252 }
1253 EXPORT_SYMBOL(input_unregister_handle);
1254
1255 static int input_open_file(struct inode *inode, struct file *file)
1256 {
1257 struct input_handler *handler = input_table[iminor(inode) >> 5];
1258 const struct file_operations *old_fops, *new_fops = NULL;
1259 int err;
1260
1261 /* No load-on-demand here? */
1262 if (!handler || !(new_fops = fops_get(handler->fops)))
1263 return -ENODEV;
1264
1265 /*
1266 * That's _really_ odd. Usually NULL ->open means "nothing special",
1267 * not "no device". Oh, well...
1268 */
1269 if (!new_fops->open) {
1270 fops_put(new_fops);
1271 return -ENODEV;
1272 }
1273 old_fops = file->f_op;
1274 file->f_op = new_fops;
1275
1276 err = new_fops->open(inode, file);
1277
1278 if (err) {
1279 fops_put(file->f_op);
1280 file->f_op = fops_get(old_fops);
1281 }
1282 fops_put(old_fops);
1283 return err;
1284 }
1285
1286 static const struct file_operations input_fops = {
1287 .owner = THIS_MODULE,
1288 .open = input_open_file,
1289 };
1290
1291 static int __init input_init(void)
1292 {
1293 int err;
1294
1295 err = class_register(&input_class);
1296 if (err) {
1297 printk(KERN_ERR "input: unable to register input_dev class\n");
1298 return err;
1299 }
1300
1301 err = input_proc_init();
1302 if (err)
1303 goto fail1;
1304
1305 err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
1306 if (err) {
1307 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
1308 goto fail2;
1309 }
1310
1311 return 0;
1312
1313 fail2: input_proc_exit();
1314 fail1: class_unregister(&input_class);
1315 return err;
1316 }
1317
1318 static void __exit input_exit(void)
1319 {
1320 input_proc_exit();
1321 unregister_chrdev(INPUT_MAJOR, "input");
1322 class_unregister(&input_class);
1323 }
1324
1325 subsys_initcall(input_init);
1326 module_exit(input_exit);
Software Suspend 2 for Linus's 2.6 head (mirror)