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[PATCH] W1: possible cleanups
[linux-2.6/verdex.git] / drivers / input / input.c
blob3038c268917d7598091e0d80f9f3a1a9cd1f4725
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 EXPORT_SYMBOL(input_allocate_device);
32 EXPORT_SYMBOL(input_register_device);
33 EXPORT_SYMBOL(input_unregister_device);
34 EXPORT_SYMBOL(input_register_handler);
35 EXPORT_SYMBOL(input_unregister_handler);
36 EXPORT_SYMBOL(input_grab_device);
37 EXPORT_SYMBOL(input_release_device);
38 EXPORT_SYMBOL(input_open_device);
39 EXPORT_SYMBOL(input_close_device);
40 EXPORT_SYMBOL(input_accept_process);
41 EXPORT_SYMBOL(input_flush_device);
42 EXPORT_SYMBOL(input_event);
43 EXPORT_SYMBOL_GPL(input_class);
44
45 #define INPUT_DEVICES 256
46
47 static LIST_HEAD(input_dev_list);
48 static LIST_HEAD(input_handler_list);
49
50 static struct input_handler *input_table[8];
51
52 void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
53 {
54 struct input_handle *handle;
55
56 if (type > EV_MAX || !test_bit(type, dev->evbit))
57 return;
58
59 add_input_randomness(type, code, value);
60
61 switch (type) {
62
63 case EV_SYN:
64 switch (code) {
65 case SYN_CONFIG:
66 if (dev->event) dev->event(dev, type, code, value);
67 break;
68
69 case SYN_REPORT:
70 if (dev->sync) return;
71 dev->sync = 1;
72 break;
73 }
74 break;
75
76 case EV_KEY:
77
78 if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value)
79 return;
80
81 if (value == 2)
82 break;
83
84 change_bit(code, dev->key);
85
86 if (test_bit(EV_REP, dev->evbit) && dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && dev->timer.data && value) {
87 dev->repeat_key = code;
88 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
89 }
90
91 break;
92
93 case EV_SW:
94
95 if (code > SW_MAX || !test_bit(code, dev->swbit) || !!test_bit(code, dev->sw) == value)
96 return;
97
98 change_bit(code, dev->sw);
99
100 break;
101
102 case EV_ABS:
103
104 if (code > ABS_MAX || !test_bit(code, dev->absbit))
105 return;
106
107 if (dev->absfuzz[code]) {
108 if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) &&
109 (value < dev->abs[code] + (dev->absfuzz[code] >> 1)))
110 return;
111
112 if ((value > dev->abs[code] - dev->absfuzz[code]) &&
113 (value < dev->abs[code] + dev->absfuzz[code]))
114 value = (dev->abs[code] * 3 + value) >> 2;
115
116 if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) &&
117 (value < dev->abs[code] + (dev->absfuzz[code] << 1)))
118 value = (dev->abs[code] + value) >> 1;
119 }
120
121 if (dev->abs[code] == value)
122 return;
123
124 dev->abs[code] = value;
125 break;
126
127 case EV_REL:
128
129 if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0))
130 return;
131
132 break;
133
134 case EV_MSC:
135
136 if (code > MSC_MAX || !test_bit(code, dev->mscbit))
137 return;
138
139 if (dev->event) dev->event(dev, type, code, value);
140
141 break;
142
143 case EV_LED:
144
145 if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value)
146 return;
147
148 change_bit(code, dev->led);
149 if (dev->event) 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) 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) return;
168
169 dev->rep[code] = value;
170 if (dev->event) dev->event(dev, type, code, value);
171
172 break;
173
174 case EV_FF:
175 if (dev->event) dev->event(dev, type, code, value);
176 break;
177 }
178
179 if (type != EV_SYN)
180 dev->sync = 0;
181
182 if (dev->grab)
183 dev->grab->handler->event(dev->grab, type, code, value);
184 else
185 list_for_each_entry(handle, &dev->h_list, d_node)
186 if (handle->open)
187 handle->handler->event(handle, type, code, value);
188 }
189
190 static void input_repeat_key(unsigned long data)
191 {
192 struct input_dev *dev = (void *) data;
193
194 if (!test_bit(dev->repeat_key, dev->key))
195 return;
196
197 input_event(dev, EV_KEY, dev->repeat_key, 2);
198 input_sync(dev);
199
200 if (dev->rep[REP_PERIOD])
201 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD]));
202 }
203
204 int input_accept_process(struct input_handle *handle, struct file *file)
205 {
206 if (handle->dev->accept)
207 return handle->dev->accept(handle->dev, file);
208
209 return 0;
210 }
211
212 int input_grab_device(struct input_handle *handle)
213 {
214 if (handle->dev->grab)
215 return -EBUSY;
216
217 handle->dev->grab = handle;
218 return 0;
219 }
220
221 void input_release_device(struct input_handle *handle)
222 {
223 if (handle->dev->grab == handle)
224 handle->dev->grab = NULL;
225 }
226
227 int input_open_device(struct input_handle *handle)
228 {
229 struct input_dev *dev = handle->dev;
230 int err;
231
232 err = mutex_lock_interruptible(&dev->mutex);
233 if (err)
234 return err;
235
236 handle->open++;
237
238 if (!dev->users++ && dev->open)
239 err = dev->open(dev);
240
241 if (err)
242 handle->open--;
243
244 mutex_unlock(&dev->mutex);
245
246 return err;
247 }
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
257 void input_close_device(struct input_handle *handle)
258 {
259 struct input_dev *dev = handle->dev;
260
261 input_release_device(handle);
262
263 mutex_lock(&dev->mutex);
264
265 if (!--dev->users && dev->close)
266 dev->close(dev);
267 handle->open--;
268
269 mutex_unlock(&dev->mutex);
270 }
271
272 static void input_link_handle(struct input_handle *handle)
273 {
274 list_add_tail(&handle->d_node, &handle->dev->h_list);
275 list_add_tail(&handle->h_node, &handle->handler->h_list);
276 }
277
278 #define MATCH_BIT(bit, max) \
279 for (i = 0; i < NBITS(max); i++) \
280 if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
281 break; \
282 if (i != NBITS(max)) \
283 continue;
284
285 static struct input_device_id *input_match_device(struct input_device_id *id, struct input_dev *dev)
286 {
287 int i;
288
289 for (; id->flags || id->driver_info; id++) {
290
291 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
292 if (id->bustype != dev->id.bustype)
293 continue;
294
295 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
296 if (id->vendor != dev->id.vendor)
297 continue;
298
299 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
300 if (id->product != dev->id.product)
301 continue;
302
303 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
304 if (id->version != dev->id.version)
305 continue;
306
307 MATCH_BIT(evbit, EV_MAX);
308 MATCH_BIT(keybit, KEY_MAX);
309 MATCH_BIT(relbit, REL_MAX);
310 MATCH_BIT(absbit, ABS_MAX);
311 MATCH_BIT(mscbit, MSC_MAX);
312 MATCH_BIT(ledbit, LED_MAX);
313 MATCH_BIT(sndbit, SND_MAX);
314 MATCH_BIT(ffbit, FF_MAX);
315 MATCH_BIT(swbit, SW_MAX);
316
317 return id;
318 }
319
320 return NULL;
321 }
322
323 #ifdef CONFIG_PROC_FS
324
325 static struct proc_dir_entry *proc_bus_input_dir;
326 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
327 static int input_devices_state;
328
329 static inline void input_wakeup_procfs_readers(void)
330 {
331 input_devices_state++;
332 wake_up(&input_devices_poll_wait);
333 }
334
335 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
336 {
337 int state = input_devices_state;
338 poll_wait(file, &input_devices_poll_wait, wait);
339 if (state != input_devices_state)
340 return POLLIN | POLLRDNORM;
341 return 0;
342 }
343
344 static struct list_head *list_get_nth_element(struct list_head *list, loff_t *pos)
345 {
346 struct list_head *node;
347 loff_t i = 0;
348
349 list_for_each(node, list)
350 if (i++ == *pos)
351 return node;
352
353 return NULL;
354 }
355
356 static struct list_head *list_get_next_element(struct list_head *list, struct list_head *element, loff_t *pos)
357 {
358 if (element->next == list)
359 return NULL;
360
361 ++(*pos);
362 return element->next;
363 }
364
365 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
366 {
367 /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
368
369 return list_get_nth_element(&input_dev_list, pos);
370 }
371
372 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
373 {
374 return list_get_next_element(&input_dev_list, v, pos);
375 }
376
377 static void input_devices_seq_stop(struct seq_file *seq, void *v)
378 {
379 /* release lock here */
380 }
381
382 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
383 unsigned long *bitmap, int max)
384 {
385 int i;
386
387 for (i = NBITS(max) - 1; i > 0; i--)
388 if (bitmap[i])
389 break;
390
391 seq_printf(seq, "B: %s=", name);
392 for (; i >= 0; i--)
393 seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : "");
394 seq_putc(seq, '\n');
395 }
396
397 static int input_devices_seq_show(struct seq_file *seq, void *v)
398 {
399 struct input_dev *dev = container_of(v, struct input_dev, node);
400 const char *path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
401 struct input_handle *handle;
402
403 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
404 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
405
406 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
407 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
408 seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
409 seq_printf(seq, "H: Handlers=");
410
411 list_for_each_entry(handle, &dev->h_list, d_node)
412 seq_printf(seq, "%s ", handle->name);
413 seq_putc(seq, '\n');
414
415 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
416 if (test_bit(EV_KEY, dev->evbit))
417 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
418 if (test_bit(EV_REL, dev->evbit))
419 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
420 if (test_bit(EV_ABS, dev->evbit))
421 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
422 if (test_bit(EV_MSC, dev->evbit))
423 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
424 if (test_bit(EV_LED, dev->evbit))
425 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
426 if (test_bit(EV_SND, dev->evbit))
427 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
428 if (test_bit(EV_FF, dev->evbit))
429 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
430 if (test_bit(EV_SW, dev->evbit))
431 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
432
433 seq_putc(seq, '\n');
434
435 kfree(path);
436 return 0;
437 }
438
439 static struct seq_operations input_devices_seq_ops = {
440 .start = input_devices_seq_start,
441 .next = input_devices_seq_next,
442 .stop = input_devices_seq_stop,
443 .show = input_devices_seq_show,
444 };
445
446 static int input_proc_devices_open(struct inode *inode, struct file *file)
447 {
448 return seq_open(file, &input_devices_seq_ops);
449 }
450
451 static struct file_operations input_devices_fileops = {
452 .owner = THIS_MODULE,
453 .open = input_proc_devices_open,
454 .poll = input_proc_devices_poll,
455 .read = seq_read,
456 .llseek = seq_lseek,
457 .release = seq_release,
458 };
459
460 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
461 {
462 /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
463 seq->private = (void *)(unsigned long)*pos;
464 return list_get_nth_element(&input_handler_list, pos);
465 }
466
467 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
468 {
469 seq->private = (void *)(unsigned long)(*pos + 1);
470 return list_get_next_element(&input_handler_list, v, pos);
471 }
472
473 static void input_handlers_seq_stop(struct seq_file *seq, void *v)
474 {
475 /* release lock here */
476 }
477
478 static int input_handlers_seq_show(struct seq_file *seq, void *v)
479 {
480 struct input_handler *handler = container_of(v, struct input_handler, node);
481
482 seq_printf(seq, "N: Number=%ld Name=%s",
483 (unsigned long)seq->private, handler->name);
484 if (handler->fops)
485 seq_printf(seq, " Minor=%d", handler->minor);
486 seq_putc(seq, '\n');
487
488 return 0;
489 }
490 static struct seq_operations input_handlers_seq_ops = {
491 .start = input_handlers_seq_start,
492 .next = input_handlers_seq_next,
493 .stop = input_handlers_seq_stop,
494 .show = input_handlers_seq_show,
495 };
496
497 static int input_proc_handlers_open(struct inode *inode, struct file *file)
498 {
499 return seq_open(file, &input_handlers_seq_ops);
500 }
501
502 static struct file_operations input_handlers_fileops = {
503 .owner = THIS_MODULE,
504 .open = input_proc_handlers_open,
505 .read = seq_read,
506 .llseek = seq_lseek,
507 .release = seq_release,
508 };
509
510 static int __init input_proc_init(void)
511 {
512 struct proc_dir_entry *entry;
513
514 proc_bus_input_dir = proc_mkdir("input", proc_bus);
515 if (!proc_bus_input_dir)
516 return -ENOMEM;
517
518 proc_bus_input_dir->owner = THIS_MODULE;
519
520 entry = create_proc_entry("devices", 0, proc_bus_input_dir);
521 if (!entry)
522 goto fail1;
523
524 entry->owner = THIS_MODULE;
525 entry->proc_fops = &input_devices_fileops;
526
527 entry = create_proc_entry("handlers", 0, proc_bus_input_dir);
528 if (!entry)
529 goto fail2;
530
531 entry->owner = THIS_MODULE;
532 entry->proc_fops = &input_handlers_fileops;
533
534 return 0;
535
536 fail2: remove_proc_entry("devices", proc_bus_input_dir);
537 fail1: remove_proc_entry("input", proc_bus);
538 return -ENOMEM;
539 }
540
541 static void input_proc_exit(void)
542 {
543 remove_proc_entry("devices", proc_bus_input_dir);
544 remove_proc_entry("handlers", proc_bus_input_dir);
545 remove_proc_entry("input", proc_bus);
546 }
547
548 #else /* !CONFIG_PROC_FS */
549 static inline void input_wakeup_procfs_readers(void) { }
550 static inline int input_proc_init(void) { return 0; }
551 static inline void input_proc_exit(void) { }
552 #endif
553
554 #define INPUT_DEV_STRING_ATTR_SHOW(name) \
555 static ssize_t input_dev_show_##name(struct class_device *dev, char *buf) \
556 { \
557 struct input_dev *input_dev = to_input_dev(dev); \
558 int retval; \
559 \
560 retval = mutex_lock_interruptible(&input_dev->mutex); \
561 if (retval) \
562 return retval; \
563 \
564 retval = scnprintf(buf, PAGE_SIZE, \
565 "%s\n", input_dev->name ? input_dev->name : ""); \
566 \
567 mutex_unlock(&input_dev->mutex); \
568 \
569 return retval; \
570 } \
571 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL);
572
573 INPUT_DEV_STRING_ATTR_SHOW(name);
574 INPUT_DEV_STRING_ATTR_SHOW(phys);
575 INPUT_DEV_STRING_ATTR_SHOW(uniq);
576
577 static int input_print_modalias_bits(char *buf, int size,
578 char name, unsigned long *bm,
579 unsigned int min_bit, unsigned int max_bit)
580 {
581 int len = 0, i;
582
583 len += snprintf(buf, max(size, 0), "%c", name);
584 for (i = min_bit; i < max_bit; i++)
585 if (bm[LONG(i)] & BIT(i))
586 len += snprintf(buf + len, max(size - len, 0), "%X,", i);
587 return len;
588 }
589
590 static int input_print_modalias(char *buf, int size, struct input_dev *id,
591 int add_cr)
592 {
593 int len;
594
595 len = snprintf(buf, max(size, 0),
596 "input:b%04Xv%04Xp%04Xe%04X-",
597 id->id.bustype, id->id.vendor,
598 id->id.product, id->id.version);
599
600 len += input_print_modalias_bits(buf + len, size - len,
601 'e', id->evbit, 0, EV_MAX);
602 len += input_print_modalias_bits(buf + len, size - len,
603 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
604 len += input_print_modalias_bits(buf + len, size - len,
605 'r', id->relbit, 0, REL_MAX);
606 len += input_print_modalias_bits(buf + len, size - len,
607 'a', id->absbit, 0, ABS_MAX);
608 len += input_print_modalias_bits(buf + len, size - len,
609 'm', id->mscbit, 0, MSC_MAX);
610 len += input_print_modalias_bits(buf + len, size - len,
611 'l', id->ledbit, 0, LED_MAX);
612 len += input_print_modalias_bits(buf + len, size - len,
613 's', id->sndbit, 0, SND_MAX);
614 len += input_print_modalias_bits(buf + len, size - len,
615 'f', id->ffbit, 0, FF_MAX);
616 len += input_print_modalias_bits(buf + len, size - len,
617 'w', id->swbit, 0, SW_MAX);
618
619 if (add_cr)
620 len += snprintf(buf + len, max(size - len, 0), "\n");
621
622 return len;
623 }
624
625 static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf)
626 {
627 struct input_dev *id = to_input_dev(dev);
628 ssize_t len;
629
630 len = input_print_modalias(buf, PAGE_SIZE, id, 1);
631
632 return max_t(int, len, PAGE_SIZE);
633 }
634 static CLASS_DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
635
636 static struct attribute *input_dev_attrs[] = {
637 &class_device_attr_name.attr,
638 &class_device_attr_phys.attr,
639 &class_device_attr_uniq.attr,
640 &class_device_attr_modalias.attr,
641 NULL
642 };
643
644 static struct attribute_group input_dev_attr_group = {
645 .attrs = input_dev_attrs,
646 };
647
648 #define INPUT_DEV_ID_ATTR(name) \
649 static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf) \
650 { \
651 struct input_dev *input_dev = to_input_dev(dev); \
652 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
653 } \
654 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL);
655
656 INPUT_DEV_ID_ATTR(bustype);
657 INPUT_DEV_ID_ATTR(vendor);
658 INPUT_DEV_ID_ATTR(product);
659 INPUT_DEV_ID_ATTR(version);
660
661 static struct attribute *input_dev_id_attrs[] = {
662 &class_device_attr_bustype.attr,
663 &class_device_attr_vendor.attr,
664 &class_device_attr_product.attr,
665 &class_device_attr_version.attr,
666 NULL
667 };
668
669 static struct attribute_group input_dev_id_attr_group = {
670 .name = "id",
671 .attrs = input_dev_id_attrs,
672 };
673
674 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
675 int max, int add_cr)
676 {
677 int i;
678 int len = 0;
679
680 for (i = NBITS(max) - 1; i > 0; i--)
681 if (bitmap[i])
682 break;
683
684 for (; i >= 0; i--)
685 len += snprintf(buf + len, max(buf_size - len, 0),
686 "%lx%s", bitmap[i], i > 0 ? " " : "");
687
688 if (add_cr)
689 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
690
691 return len;
692 }
693
694 #define INPUT_DEV_CAP_ATTR(ev, bm) \
695 static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf) \
696 { \
697 struct input_dev *input_dev = to_input_dev(dev); \
698 int len = input_print_bitmap(buf, PAGE_SIZE, \
699 input_dev->bm##bit, ev##_MAX, 1); \
700 return min_t(int, len, PAGE_SIZE); \
701 } \
702 static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL);
703
704 INPUT_DEV_CAP_ATTR(EV, ev);
705 INPUT_DEV_CAP_ATTR(KEY, key);
706 INPUT_DEV_CAP_ATTR(REL, rel);
707 INPUT_DEV_CAP_ATTR(ABS, abs);
708 INPUT_DEV_CAP_ATTR(MSC, msc);
709 INPUT_DEV_CAP_ATTR(LED, led);
710 INPUT_DEV_CAP_ATTR(SND, snd);
711 INPUT_DEV_CAP_ATTR(FF, ff);
712 INPUT_DEV_CAP_ATTR(SW, sw);
713
714 static struct attribute *input_dev_caps_attrs[] = {
715 &class_device_attr_ev.attr,
716 &class_device_attr_key.attr,
717 &class_device_attr_rel.attr,
718 &class_device_attr_abs.attr,
719 &class_device_attr_msc.attr,
720 &class_device_attr_led.attr,
721 &class_device_attr_snd.attr,
722 &class_device_attr_ff.attr,
723 &class_device_attr_sw.attr,
724 NULL
725 };
726
727 static struct attribute_group input_dev_caps_attr_group = {
728 .name = "capabilities",
729 .attrs = input_dev_caps_attrs,
730 };
731
732 static void input_dev_release(struct class_device *class_dev)
733 {
734 struct input_dev *dev = to_input_dev(class_dev);
735
736 kfree(dev);
737 module_put(THIS_MODULE);
738 }
739
740 /*
741 * Input uevent interface - loading event handlers based on
742 * device bitfields.
743 */
744 static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index,
745 char *buffer, int buffer_size, int *cur_len,
746 const char *name, unsigned long *bitmap, int max)
747 {
748 if (*cur_index >= num_envp - 1)
749 return -ENOMEM;
750
751 envp[*cur_index] = buffer + *cur_len;
752
753 *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name);
754 if (*cur_len >= buffer_size)
755 return -ENOMEM;
756
757 *cur_len += input_print_bitmap(buffer + *cur_len,
758 max(buffer_size - *cur_len, 0),
759 bitmap, max, 0) + 1;
760 if (*cur_len > buffer_size)
761 return -ENOMEM;
762
763 (*cur_index)++;
764 return 0;
765 }
766
767 static int input_add_uevent_modalias_var(char **envp, int num_envp, int *cur_index,
768 char *buffer, int buffer_size, int *cur_len,
769 struct input_dev *dev)
770 {
771 if (*cur_index >= num_envp - 1)
772 return -ENOMEM;
773
774 envp[*cur_index] = buffer + *cur_len;
775
776 *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0),
777 "MODALIAS=");
778 if (*cur_len >= buffer_size)
779 return -ENOMEM;
780
781 *cur_len += input_print_modalias(buffer + *cur_len,
782 max(buffer_size - *cur_len, 0),
783 dev, 0) + 1;
784 if (*cur_len > buffer_size)
785 return -ENOMEM;
786
787 (*cur_index)++;
788 return 0;
789 }
790
791 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
792 do { \
793 int err = add_uevent_var(envp, num_envp, &i, \
794 buffer, buffer_size, &len, \
795 fmt, val); \
796 if (err) \
797 return err; \
798 } while (0)
799
800 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
801 do { \
802 int err = input_add_uevent_bm_var(envp, num_envp, &i, \
803 buffer, buffer_size, &len, \
804 name, bm, max); \
805 if (err) \
806 return err; \
807 } while (0)
808
809 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
810 do { \
811 int err = input_add_uevent_modalias_var(envp, \
812 num_envp, &i, \
813 buffer, buffer_size, &len, \
814 dev); \
815 if (err) \
816 return err; \
817 } while (0)
818
819 static int input_dev_uevent(struct class_device *cdev, char **envp,
820 int num_envp, char *buffer, int buffer_size)
821 {
822 struct input_dev *dev = to_input_dev(cdev);
823 int i = 0;
824 int len = 0;
825
826 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
827 dev->id.bustype, dev->id.vendor,
828 dev->id.product, dev->id.version);
829 if (dev->name)
830 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
831 if (dev->phys)
832 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
833 if (dev->uniq)
834 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
835
836 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
837 if (test_bit(EV_KEY, dev->evbit))
838 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
839 if (test_bit(EV_REL, dev->evbit))
840 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
841 if (test_bit(EV_ABS, dev->evbit))
842 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
843 if (test_bit(EV_MSC, dev->evbit))
844 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
845 if (test_bit(EV_LED, dev->evbit))
846 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
847 if (test_bit(EV_SND, dev->evbit))
848 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
849 if (test_bit(EV_FF, dev->evbit))
850 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
851 if (test_bit(EV_SW, dev->evbit))
852 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
853
854 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
855
856 envp[i] = NULL;
857 return 0;
858 }
859
860 struct class input_class = {
861 .name = "input",
862 .release = input_dev_release,
863 .uevent = input_dev_uevent,
864 };
865
866 struct input_dev *input_allocate_device(void)
867 {
868 struct input_dev *dev;
869
870 dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
871 if (dev) {
872 dev->dynalloc = 1;
873 dev->cdev.class = &input_class;
874 class_device_initialize(&dev->cdev);
875 INIT_LIST_HEAD(&dev->h_list);
876 INIT_LIST_HEAD(&dev->node);
877 }
878
879 return dev;
880 }
881
882 int input_register_device(struct input_dev *dev)
883 {
884 static atomic_t input_no = ATOMIC_INIT(0);
885 struct input_handle *handle;
886 struct input_handler *handler;
887 struct input_device_id *id;
888 const char *path;
889 int error;
890
891 if (!dev->dynalloc) {
892 printk(KERN_WARNING "input: device %s is statically allocated, will not register\n"
893 "Please convert to input_allocate_device() or contact dtor_core@ameritech.net\n",
894 dev->name ? dev->name : "<Unknown>");
895 return -EINVAL;
896 }
897
898 mutex_init(&dev->mutex);
899 set_bit(EV_SYN, dev->evbit);
900
901 /*
902 * If delay and period are pre-set by the driver, then autorepeating
903 * is handled by the driver itself and we don't do it in input.c.
904 */
905
906 init_timer(&dev->timer);
907 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
908 dev->timer.data = (long) dev;
909 dev->timer.function = input_repeat_key;
910 dev->rep[REP_DELAY] = 250;
911 dev->rep[REP_PERIOD] = 33;
912 }
913
914 INIT_LIST_HEAD(&dev->h_list);
915 list_add_tail(&dev->node, &input_dev_list);
916
917 dev->cdev.class = &input_class;
918 snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id),
919 "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
920
921 error = class_device_add(&dev->cdev);
922 if (error)
923 return error;
924
925 error = sysfs_create_group(&dev->cdev.kobj, &input_dev_attr_group);
926 if (error)
927 goto fail1;
928
929 error = sysfs_create_group(&dev->cdev.kobj, &input_dev_id_attr_group);
930 if (error)
931 goto fail2;
932
933 error = sysfs_create_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
934 if (error)
935 goto fail3;
936
937 __module_get(THIS_MODULE);
938
939 path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
940 printk(KERN_INFO "input: %s as %s\n",
941 dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
942 kfree(path);
943
944 list_for_each_entry(handler, &input_handler_list, node)
945 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
946 if ((id = input_match_device(handler->id_table, dev)))
947 if ((handle = handler->connect(handler, dev, id)))
948 input_link_handle(handle);
949
950 input_wakeup_procfs_readers();
951
952 return 0;
953
954 fail3: sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
955 fail2: sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
956 fail1: class_device_del(&dev->cdev);
957 return error;
958 }
959
960 void input_unregister_device(struct input_dev *dev)
961 {
962 struct list_head * node, * next;
963
964 if (!dev) return;
965
966 del_timer_sync(&dev->timer);
967
968 list_for_each_safe(node, next, &dev->h_list) {
969 struct input_handle * handle = to_handle(node);
970 list_del_init(&handle->d_node);
971 list_del_init(&handle->h_node);
972 handle->handler->disconnect(handle);
973 }
974
975 list_del_init(&dev->node);
976
977 sysfs_remove_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
978 sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
979 sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
980 class_device_unregister(&dev->cdev);
981
982 input_wakeup_procfs_readers();
983 }
984
985 void input_register_handler(struct input_handler *handler)
986 {
987 struct input_dev *dev;
988 struct input_handle *handle;
989 struct input_device_id *id;
990
991 if (!handler) return;
992
993 INIT_LIST_HEAD(&handler->h_list);
994
995 if (handler->fops != NULL)
996 input_table[handler->minor >> 5] = handler;
997
998 list_add_tail(&handler->node, &input_handler_list);
999
1000 list_for_each_entry(dev, &input_dev_list, node)
1001 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
1002 if ((id = input_match_device(handler->id_table, dev)))
1003 if ((handle = handler->connect(handler, dev, id)))
1004 input_link_handle(handle);
1005
1006 input_wakeup_procfs_readers();
1007 }
1008
1009 void input_unregister_handler(struct input_handler *handler)
1010 {
1011 struct list_head * node, * next;
1012
1013 list_for_each_safe(node, next, &handler->h_list) {
1014 struct input_handle * handle = to_handle_h(node);
1015 list_del_init(&handle->h_node);
1016 list_del_init(&handle->d_node);
1017 handler->disconnect(handle);
1018 }
1019
1020 list_del_init(&handler->node);
1021
1022 if (handler->fops != NULL)
1023 input_table[handler->minor >> 5] = NULL;
1024
1025 input_wakeup_procfs_readers();
1026 }
1027
1028 static int input_open_file(struct inode *inode, struct file *file)
1029 {
1030 struct input_handler *handler = input_table[iminor(inode) >> 5];
1031 const struct file_operations *old_fops, *new_fops = NULL;
1032 int err;
1033
1034 /* No load-on-demand here? */
1035 if (!handler || !(new_fops = fops_get(handler->fops)))
1036 return -ENODEV;
1037
1038 /*
1039 * That's _really_ odd. Usually NULL ->open means "nothing special",
1040 * not "no device". Oh, well...
1041 */
1042 if (!new_fops->open) {
1043 fops_put(new_fops);
1044 return -ENODEV;
1045 }
1046 old_fops = file->f_op;
1047 file->f_op = new_fops;
1048
1049 err = new_fops->open(inode, file);
1050
1051 if (err) {
1052 fops_put(file->f_op);
1053 file->f_op = fops_get(old_fops);
1054 }
1055 fops_put(old_fops);
1056 return err;
1057 }
1058
1059 static struct file_operations input_fops = {
1060 .owner = THIS_MODULE,
1061 .open = input_open_file,
1062 };
1063
1064 static int __init input_init(void)
1065 {
1066 int err;
1067
1068 err = class_register(&input_class);
1069 if (err) {
1070 printk(KERN_ERR "input: unable to register input_dev class\n");
1071 return err;
1072 }
1073
1074 err = input_proc_init();
1075 if (err)
1076 goto fail1;
1077
1078 err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
1079 if (err) {
1080 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
1081 goto fail2;
1082 }
1083
1084 return 0;
1085
1086 fail2: input_proc_exit();
1087 fail1: class_unregister(&input_class);
1088 return err;
1089 }
1090
1091 static void __exit input_exit(void)
1092 {
1093 input_proc_exit();
1094 unregister_chrdev(INPUT_MAJOR, "input");
1095 class_unregister(&input_class);
1096 }
1097
1098 subsys_initcall(input_init);
1099 module_exit(input_exit);
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