projects/linux·blob v2.6.21 · refs

1171 lines · 28.7 KiB

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
26MODULE_AUTHOR("Vojtech Pavlik <[email protected]>");
27MODULE_DESCRIPTION("Input core");
28MODULE_LICENSE("GPL");
29
30#define INPUT_DEVICES 256
31
32static LIST_HEAD(input_dev_list);
33static LIST_HEAD(input_handler_list);
34
35static 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 */
47void 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}
197EXPORT_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 */
209void 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}
214EXPORT_SYMBOL(input_inject_event);
215
216static 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
230int 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}
238EXPORT_SYMBOL(input_grab_device);
239
240void 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}
252EXPORT_SYMBOL(input_release_device);
253
254int 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}
275EXPORT_SYMBOL(input_open_device);
276
277int 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}
284EXPORT_SYMBOL(input_flush_device);
285
286void 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}
300EXPORT_SYMBOL(input_close_device);
301
302static 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
315static 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
356static struct proc_dir_entry *proc_bus_input_dir;
357static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
358static int input_devices_state;
359
360static inline void input_wakeup_procfs_readers(void)
361{
362 input_devices_state++;
363 wake_up(&input_devices_poll_wait);
364}
365
366static 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
377static 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
389static 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
398static 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
405static 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
410static void input_devices_seq_stop(struct seq_file *seq, void *v)
411{
412 /* release lock here */
413}
414
415static 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
430static 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
472static 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
479static int input_proc_devices_open(struct inode *inode, struct file *file)
480{
481 return seq_open(file, &input_devices_seq_ops);
482}
483
484static 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
493static 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
500static 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
506static void input_handlers_seq_stop(struct seq_file *seq, void *v)
507{
508 /* release lock here */
509}
510
511static 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}
523static 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
530static int input_proc_handlers_open(struct inode *inode, struct file *file)
531{
532 return seq_open(file, &input_handlers_seq_ops);
533}
534
535static 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
543static 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
574static 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 */
582static inline void input_wakeup_procfs_readers(void) { }
583static inline int input_proc_init(void) { return 0; }
584static inline void input_proc_exit(void) { }
585#endif
586
587#define INPUT_DEV_STRING_ATTR_SHOW(name) \
588static ssize_t input_dev_show_##name(struct class_device *dev, char *buf) \
589{ \
590 struct input_dev *input_dev = to_input_dev(dev); \
591 \
592 return scnprintf(buf, PAGE_SIZE, "%s\n", \
593 input_dev->name ? input_dev->name : ""); \
594} \
595static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL);
596
597INPUT_DEV_STRING_ATTR_SHOW(name);
598INPUT_DEV_STRING_ATTR_SHOW(phys);
599INPUT_DEV_STRING_ATTR_SHOW(uniq);
600
601static int input_print_modalias_bits(char *buf, int size,
602 char name, unsigned long *bm,
603 unsigned int min_bit, unsigned int max_bit)
604{
605 int len = 0, i;
606
607 len += snprintf(buf, max(size, 0), "%c", name);
608 for (i = min_bit; i < max_bit; i++)
609 if (bm[LONG(i)] & BIT(i))
610 len += snprintf(buf + len, max(size - len, 0), "%X,", i);
611 return len;
612}
613
614static int input_print_modalias(char *buf, int size, struct input_dev *id,
615 int add_cr)
616{
617 int len;
618
619 len = snprintf(buf, max(size, 0),
620 "input:b%04Xv%04Xp%04Xe%04X-",
621 id->id.bustype, id->id.vendor,
622 id->id.product, id->id.version);
623
624 len += input_print_modalias_bits(buf + len, size - len,
625 'e', id->evbit, 0, EV_MAX);
626 len += input_print_modalias_bits(buf + len, size - len,
627 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
628 len += input_print_modalias_bits(buf + len, size - len,
629 'r', id->relbit, 0, REL_MAX);
630 len += input_print_modalias_bits(buf + len, size - len,
631 'a', id->absbit, 0, ABS_MAX);
632 len += input_print_modalias_bits(buf + len, size - len,
633 'm', id->mscbit, 0, MSC_MAX);
634 len += input_print_modalias_bits(buf + len, size - len,
635 'l', id->ledbit, 0, LED_MAX);
636 len += input_print_modalias_bits(buf + len, size - len,
637 's', id->sndbit, 0, SND_MAX);
638 len += input_print_modalias_bits(buf + len, size - len,
639 'f', id->ffbit, 0, FF_MAX);
640 len += input_print_modalias_bits(buf + len, size - len,
641 'w', id->swbit, 0, SW_MAX);
642
643 if (add_cr)
644 len += snprintf(buf + len, max(size - len, 0), "\n");
645
646 return len;
647}
648
649static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf)
650{
651 struct input_dev *id = to_input_dev(dev);
652 ssize_t len;
653
654 len = input_print_modalias(buf, PAGE_SIZE, id, 1);
655
656 return min_t(int, len, PAGE_SIZE);
657}
658static CLASS_DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
659
660static struct attribute *input_dev_attrs[] = {
661 &class_device_attr_name.attr,
662 &class_device_attr_phys.attr,
663 &class_device_attr_uniq.attr,
664 &class_device_attr_modalias.attr,
665 NULL
666};
667
668static struct attribute_group input_dev_attr_group = {
669 .attrs = input_dev_attrs,
670};
671
672#define INPUT_DEV_ID_ATTR(name) \
673static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf) \
674{ \
675 struct input_dev *input_dev = to_input_dev(dev); \
676 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
677} \
678static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL);
679
680INPUT_DEV_ID_ATTR(bustype);
681INPUT_DEV_ID_ATTR(vendor);
682INPUT_DEV_ID_ATTR(product);
683INPUT_DEV_ID_ATTR(version);
684
685static struct attribute *input_dev_id_attrs[] = {
686 &class_device_attr_bustype.attr,
687 &class_device_attr_vendor.attr,
688 &class_device_attr_product.attr,
689 &class_device_attr_version.attr,
690 NULL
691};
692
693static struct attribute_group input_dev_id_attr_group = {
694 .name = "id",
695 .attrs = input_dev_id_attrs,
696};
697
698static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
699 int max, int add_cr)
700{
701 int i;
702 int len = 0;
703
704 for (i = NBITS(max) - 1; i > 0; i--)
705 if (bitmap[i])
706 break;
707
708 for (; i >= 0; i--)
709 len += snprintf(buf + len, max(buf_size - len, 0),
710 "%lx%s", bitmap[i], i > 0 ? " " : "");
711
712 if (add_cr)
713 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
714
715 return len;
716}
717
718#define INPUT_DEV_CAP_ATTR(ev, bm) \
719static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf) \
720{ \
721 struct input_dev *input_dev = to_input_dev(dev); \
722 int len = input_print_bitmap(buf, PAGE_SIZE, \
723 input_dev->bm##bit, ev##_MAX, 1); \
724 return min_t(int, len, PAGE_SIZE); \
725} \
726static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL);
727
728INPUT_DEV_CAP_ATTR(EV, ev);
729INPUT_DEV_CAP_ATTR(KEY, key);
730INPUT_DEV_CAP_ATTR(REL, rel);
731INPUT_DEV_CAP_ATTR(ABS, abs);
732INPUT_DEV_CAP_ATTR(MSC, msc);
733INPUT_DEV_CAP_ATTR(LED, led);
734INPUT_DEV_CAP_ATTR(SND, snd);
735INPUT_DEV_CAP_ATTR(FF, ff);
736INPUT_DEV_CAP_ATTR(SW, sw);
737
738static struct attribute *input_dev_caps_attrs[] = {
739 &class_device_attr_ev.attr,
740 &class_device_attr_key.attr,
741 &class_device_attr_rel.attr,
742 &class_device_attr_abs.attr,
743 &class_device_attr_msc.attr,
744 &class_device_attr_led.attr,
745 &class_device_attr_snd.attr,
746 &class_device_attr_ff.attr,
747 &class_device_attr_sw.attr,
748 NULL
749};
750
751static struct attribute_group input_dev_caps_attr_group = {
752 .name = "capabilities",
753 .attrs = input_dev_caps_attrs,
754};
755
756static void input_dev_release(struct class_device *class_dev)
757{
758 struct input_dev *dev = to_input_dev(class_dev);
759
760 input_ff_destroy(dev);
761 kfree(dev);
762
763 module_put(THIS_MODULE);
764}
765
766/*
767 * Input uevent interface - loading event handlers based on
768 * device bitfields.
769 */
770static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index,
771 char *buffer, int buffer_size, int *cur_len,
772 const char *name, unsigned long *bitmap, int max)
773{
774 if (*cur_index >= num_envp - 1)
775 return -ENOMEM;
776
777 envp[*cur_index] = buffer + *cur_len;
778
779 *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name);
780 if (*cur_len >= buffer_size)
781 return -ENOMEM;
782
783 *cur_len += input_print_bitmap(buffer + *cur_len,
784 max(buffer_size - *cur_len, 0),
785 bitmap, max, 0) + 1;
786 if (*cur_len > buffer_size)
787 return -ENOMEM;
788
789 (*cur_index)++;
790 return 0;
791}
792
793static int input_add_uevent_modalias_var(char **envp, int num_envp, int *cur_index,
794 char *buffer, int buffer_size, int *cur_len,
795 struct input_dev *dev)
796{
797 if (*cur_index >= num_envp - 1)
798 return -ENOMEM;
799
800 envp[*cur_index] = buffer + *cur_len;
801
802 *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0),
803 "MODALIAS=");
804 if (*cur_len >= buffer_size)
805 return -ENOMEM;
806
807 *cur_len += input_print_modalias(buffer + *cur_len,
808 max(buffer_size - *cur_len, 0),
809 dev, 0) + 1;
810 if (*cur_len > buffer_size)
811 return -ENOMEM;
812
813 (*cur_index)++;
814 return 0;
815}
816
817#define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
818 do { \
819 int err = add_uevent_var(envp, num_envp, &i, \
820 buffer, buffer_size, &len, \
821 fmt, val); \
822 if (err) \
823 return err; \
824 } while (0)
825
826#define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
827 do { \
828 int err = input_add_uevent_bm_var(envp, num_envp, &i, \
829 buffer, buffer_size, &len, \
830 name, bm, max); \
831 if (err) \
832 return err; \
833 } while (0)
834
835#define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
836 do { \
837 int err = input_add_uevent_modalias_var(envp, \
838 num_envp, &i, \
839 buffer, buffer_size, &len, \
840 dev); \
841 if (err) \
842 return err; \
843 } while (0)
844
845static int input_dev_uevent(struct class_device *cdev, char **envp,
846 int num_envp, char *buffer, int buffer_size)
847{
848 struct input_dev *dev = to_input_dev(cdev);
849 int i = 0;
850 int len = 0;
851
852 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
853 dev->id.bustype, dev->id.vendor,
854 dev->id.product, dev->id.version);
855 if (dev->name)
856 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
857 if (dev->phys)
858 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
859 if (dev->uniq)
860 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
861
862 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
863 if (test_bit(EV_KEY, dev->evbit))
864 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
865 if (test_bit(EV_REL, dev->evbit))
866 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
867 if (test_bit(EV_ABS, dev->evbit))
868 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
869 if (test_bit(EV_MSC, dev->evbit))
870 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
871 if (test_bit(EV_LED, dev->evbit))
872 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
873 if (test_bit(EV_SND, dev->evbit))
874 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
875 if (test_bit(EV_FF, dev->evbit))
876 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
877 if (test_bit(EV_SW, dev->evbit))
878 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
879
880 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
881
882 envp[i] = NULL;
883 return 0;
884}
885
886struct class input_class = {
887 .name = "input",
888 .release = input_dev_release,
889 .uevent = input_dev_uevent,
890};
891EXPORT_SYMBOL_GPL(input_class);
892
893/**
894 * input_allocate_device - allocate memory for new input device
895 *
896 * Returns prepared struct input_dev or NULL.
897 *
898 * NOTE: Use input_free_device() to free devices that have not been
899 * registered; input_unregister_device() should be used for already
900 * registered devices.
901 */
902struct input_dev *input_allocate_device(void)
903{
904 struct input_dev *dev;
905
906 dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
907 if (dev) {
908 dev->cdev.class = &input_class;
909 class_device_initialize(&dev->cdev);
910 mutex_init(&dev->mutex);
911 INIT_LIST_HEAD(&dev->h_list);
912 INIT_LIST_HEAD(&dev->node);
913
914 __module_get(THIS_MODULE);
915 }
916
917 return dev;
918}
919EXPORT_SYMBOL(input_allocate_device);
920
921/**
922 * input_free_device - free memory occupied by input_dev structure
923 * @dev: input device to free
924 *
925 * This function should only be used if input_register_device()
926 * was not called yet or if it failed. Once device was registered
927 * use input_unregister_device() and memory will be freed once last
928 * refrence to the device is dropped.
929 *
930 * Device should be allocated by input_allocate_device().
931 *
932 * NOTE: If there are references to the input device then memory
933 * will not be freed until last reference is dropped.
934 */
935void input_free_device(struct input_dev *dev)
936{
937 if (dev) {
938
939 mutex_lock(&dev->mutex);
940 dev->name = dev->phys = dev->uniq = NULL;
941 mutex_unlock(&dev->mutex);
942
943 input_put_device(dev);
944 }
945}
946EXPORT_SYMBOL(input_free_device);
947
948int input_register_device(struct input_dev *dev)
949{
950 static atomic_t input_no = ATOMIC_INIT(0);
951 struct input_handle *handle;
952 struct input_handler *handler;
953 const struct input_device_id *id;
954 const char *path;
955 int error;
956
957 set_bit(EV_SYN, dev->evbit);
958
959 /*
960 * If delay and period are pre-set by the driver, then autorepeating
961 * is handled by the driver itself and we don't do it in input.c.
962 */
963
964 init_timer(&dev->timer);
965 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
966 dev->timer.data = (long) dev;
967 dev->timer.function = input_repeat_key;
968 dev->rep[REP_DELAY] = 250;
969 dev->rep[REP_PERIOD] = 33;
970 }
971
972 list_add_tail(&dev->node, &input_dev_list);
973
974 snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id),
975 "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
976
977 error = class_device_add(&dev->cdev);
978 if (error)
979 return error;
980
981 error = sysfs_create_group(&dev->cdev.kobj, &input_dev_attr_group);
982 if (error)
983 goto fail1;
984
985 error = sysfs_create_group(&dev->cdev.kobj, &input_dev_id_attr_group);
986 if (error)
987 goto fail2;
988
989 error = sysfs_create_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
990 if (error)
991 goto fail3;
992
993 path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
994 printk(KERN_INFO "input: %s as %s\n",
995 dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
996 kfree(path);
997
998 list_for_each_entry(handler, &input_handler_list, node)
999 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
1000 if ((id = input_match_device(handler->id_table, dev)))
1001 if ((handle = handler->connect(handler, dev, id))) {
1002 input_link_handle(handle);
1003 if (handler->start)
1004 handler->start(handle);
1005 }
1006
1007 input_wakeup_procfs_readers();
1008
1009 return 0;
1010
1011 fail3: sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
1012 fail2: sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
1013 fail1: class_device_del(&dev->cdev);
1014 return error;
1015}
1016EXPORT_SYMBOL(input_register_device);
1017
1018void input_unregister_device(struct input_dev *dev)
1019{
1020 struct list_head *node, *next;
1021 int code;
1022
1023 for (code = 0; code <= KEY_MAX; code++)
1024 if (test_bit(code, dev->key))
1025 input_report_key(dev, code, 0);
1026 input_sync(dev);
1027
1028 del_timer_sync(&dev->timer);
1029
1030 list_for_each_safe(node, next, &dev->h_list) {
1031 struct input_handle * handle = to_handle(node);
1032 list_del_init(&handle->d_node);
1033 list_del_init(&handle->h_node);
1034 handle->handler->disconnect(handle);
1035 }
1036
1037 list_del_init(&dev->node);
1038
1039 sysfs_remove_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
1040 sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
1041 sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
1042
1043 class_device_unregister(&dev->cdev);
1044
1045 input_wakeup_procfs_readers();
1046}
1047EXPORT_SYMBOL(input_unregister_device);
1048
1049int input_register_handler(struct input_handler *handler)
1050{
1051 struct input_dev *dev;
1052 struct input_handle *handle;
1053 const struct input_device_id *id;
1054
1055 INIT_LIST_HEAD(&handler->h_list);
1056
1057 if (handler->fops != NULL) {
1058 if (input_table[handler->minor >> 5])
1059 return -EBUSY;
1060
1061 input_table[handler->minor >> 5] = handler;
1062 }
1063
1064 list_add_tail(&handler->node, &input_handler_list);
1065
1066 list_for_each_entry(dev, &input_dev_list, node)
1067 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
1068 if ((id = input_match_device(handler->id_table, dev)))
1069 if ((handle = handler->connect(handler, dev, id))) {
1070 input_link_handle(handle);
1071 if (handler->start)
1072 handler->start(handle);
1073 }
1074
1075 input_wakeup_procfs_readers();
1076 return 0;
1077}
1078EXPORT_SYMBOL(input_register_handler);
1079
1080void input_unregister_handler(struct input_handler *handler)
1081{
1082 struct list_head *node, *next;
1083
1084 list_for_each_safe(node, next, &handler->h_list) {
1085 struct input_handle * handle = to_handle_h(node);
1086 list_del_init(&handle->h_node);
1087 list_del_init(&handle->d_node);
1088 handler->disconnect(handle);
1089 }
1090
1091 list_del_init(&handler->node);
1092
1093 if (handler->fops != NULL)
1094 input_table[handler->minor >> 5] = NULL;
1095
1096 input_wakeup_procfs_readers();
1097}
1098EXPORT_SYMBOL(input_unregister_handler);
1099
1100static int input_open_file(struct inode *inode, struct file *file)
1101{
1102 struct input_handler *handler = input_table[iminor(inode) >> 5];
1103 const struct file_operations *old_fops, *new_fops = NULL;
1104 int err;
1105
1106 /* No load-on-demand here? */
1107 if (!handler || !(new_fops = fops_get(handler->fops)))
1108 return -ENODEV;
1109
1110 /*
1111 * That's _really_ odd. Usually NULL ->open means "nothing special",
1112 * not "no device". Oh, well...
1113 */
1114 if (!new_fops->open) {
1115 fops_put(new_fops);
1116 return -ENODEV;
1117 }
1118 old_fops = file->f_op;
1119 file->f_op = new_fops;
1120
1121 err = new_fops->open(inode, file);
1122
1123 if (err) {
1124 fops_put(file->f_op);
1125 file->f_op = fops_get(old_fops);
1126 }
1127 fops_put(old_fops);
1128 return err;
1129}
1130
1131static const struct file_operations input_fops = {
1132 .owner = THIS_MODULE,
1133 .open = input_open_file,
1134};
1135
1136static int __init input_init(void)
1137{
1138 int err;
1139
1140 err = class_register(&input_class);
1141 if (err) {
1142 printk(KERN_ERR "input: unable to register input_dev class\n");
1143 return err;
1144 }
1145
1146 err = input_proc_init();
1147 if (err)
1148 goto fail1;
1149
1150 err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
1151 if (err) {
1152 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
1153 goto fail2;
1154 }
1155
1156 return 0;
1157
1158 fail2: input_proc_exit();
1159 fail1: class_unregister(&input_class);
1160 return err;
1161}
1162
1163static void __exit input_exit(void)
1164{
1165 input_proc_exit();
1166 unregister_chrdev(INPUT_MAJOR, "input");
1167 class_unregister(&input_class);
1168}
1169
1170subsys_initcall(input_init);
1171module_exit(input_exit);