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