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