Input: add comments to input_{allocate|free}_device()
[linux-2.6.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 /**
39  * input_event() - report new input event
40  * @dev: device that generated the event
41  * @type: type of the event
42  * @code: event code
43  * @value: value of the event
44  *
45  * This function should be used by drivers implementing various input devices
46  * See also input_inject_event()
47  */
48 void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
49 {
50         struct input_handle *handle;
51
52         if (type > EV_MAX || !test_bit(type, dev->evbit))
53                 return;
54
55         add_input_randomness(type, code, value);
56
57         switch (type) {
58
59                 case EV_SYN:
60                         switch (code) {
61                                 case SYN_CONFIG:
62                                         if (dev->event)
63                                                 dev->event(dev, type, code, value);
64                                         break;
65
66                                 case SYN_REPORT:
67                                         if (dev->sync)
68                                                 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)
138                                 dev->event(dev, type, code, value);
139
140                         break;
141
142                 case EV_LED:
143
144                         if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value)
145                                 return;
146
147                         change_bit(code, dev->led);
148
149                         if (dev->event)
150                                 dev->event(dev, type, code, value);
151
152                         break;
153
154                 case EV_SND:
155
156                         if (code > SND_MAX || !test_bit(code, dev->sndbit))
157                                 return;
158
159                         if (!!test_bit(code, dev->snd) != !!value)
160                                 change_bit(code, dev->snd);
161
162                         if (dev->event)
163                                 dev->event(dev, type, code, value);
164
165                         break;
166
167                 case EV_REP:
168
169                         if (code > REP_MAX || value < 0 || dev->rep[code] == value)
170                                 return;
171
172                         dev->rep[code] = value;
173                         if (dev->event)
174                                 dev->event(dev, type, code, value);
175
176                         break;
177
178                 case EV_FF:
179
180                         if (value < 0)
181                                 return;
182
183                         if (dev->event)
184                                 dev->event(dev, type, code, value);
185                         break;
186         }
187
188         if (type != EV_SYN)
189                 dev->sync = 0;
190
191         if (dev->grab)
192                 dev->grab->handler->event(dev->grab, type, code, value);
193         else
194                 list_for_each_entry(handle, &dev->h_list, d_node)
195                         if (handle->open)
196                                 handle->handler->event(handle, type, code, value);
197 }
198 EXPORT_SYMBOL(input_event);
199
200 /**
201  * input_inject_event() - send input event from input handler
202  * @handle: input handle to send event through
203  * @type: type of the event
204  * @code: event code
205  * @value: value of the event
206  *
207  * Similar to input_event() but will ignore event if device is "grabbed" and handle
208  * injecting event is not the one that owns the device.
209  */
210 void input_inject_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
211 {
212         if (!handle->dev->grab || handle->dev->grab == handle)
213                 input_event(handle->dev, type, code, value);
214 }
215 EXPORT_SYMBOL(input_inject_event);
216
217 static void input_repeat_key(unsigned long data)
218 {
219         struct input_dev *dev = (void *) data;
220
221         if (!test_bit(dev->repeat_key, dev->key))
222                 return;
223
224         input_event(dev, EV_KEY, dev->repeat_key, 2);
225         input_sync(dev);
226
227         if (dev->rep[REP_PERIOD])
228                 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD]));
229 }
230
231 int input_grab_device(struct input_handle *handle)
232 {
233         if (handle->dev->grab)
234                 return -EBUSY;
235
236         handle->dev->grab = handle;
237         return 0;
238 }
239 EXPORT_SYMBOL(input_grab_device);
240
241 void input_release_device(struct input_handle *handle)
242 {
243         struct input_dev *dev = handle->dev;
244
245         if (dev->grab == handle) {
246                 dev->grab = NULL;
247
248                 list_for_each_entry(handle, &dev->h_list, d_node)
249                         if (handle->handler->start)
250                                 handle->handler->start(handle);
251         }
252 }
253 EXPORT_SYMBOL(input_release_device);
254
255 int input_open_device(struct input_handle *handle)
256 {
257         struct input_dev *dev = handle->dev;
258         int err;
259
260         err = mutex_lock_interruptible(&dev->mutex);
261         if (err)
262                 return err;
263
264         handle->open++;
265
266         if (!dev->users++ && dev->open)
267                 err = dev->open(dev);
268
269         if (err)
270                 handle->open--;
271
272         mutex_unlock(&dev->mutex);
273
274         return err;
275 }
276 EXPORT_SYMBOL(input_open_device);
277
278 int input_flush_device(struct input_handle* handle, struct file* file)
279 {
280         if (handle->dev->flush)
281                 return handle->dev->flush(handle->dev, file);
282
283         return 0;
284 }
285 EXPORT_SYMBOL(input_flush_device);
286
287 void input_close_device(struct input_handle *handle)
288 {
289         struct input_dev *dev = handle->dev;
290
291         input_release_device(handle);
292
293         mutex_lock(&dev->mutex);
294
295         if (!--dev->users && dev->close)
296                 dev->close(dev);
297         handle->open--;
298
299         mutex_unlock(&dev->mutex);
300 }
301 EXPORT_SYMBOL(input_close_device);
302
303 static void input_link_handle(struct input_handle *handle)
304 {
305         list_add_tail(&handle->d_node, &handle->dev->h_list);
306         list_add_tail(&handle->h_node, &handle->handler->h_list);
307 }
308
309 #define MATCH_BIT(bit, max) \
310                 for (i = 0; i < NBITS(max); i++) \
311                         if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
312                                 break; \
313                 if (i != NBITS(max)) \
314                         continue;
315
316 static const struct input_device_id *input_match_device(const struct input_device_id *id,
317                                                         struct input_dev *dev)
318 {
319         int i;
320
321         for (; id->flags || id->driver_info; id++) {
322
323                 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
324                         if (id->bustype != dev->id.bustype)
325                                 continue;
326
327                 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
328                         if (id->vendor != dev->id.vendor)
329                                 continue;
330
331                 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
332                         if (id->product != dev->id.product)
333                                 continue;
334
335                 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
336                         if (id->version != dev->id.version)
337                                 continue;
338
339                 MATCH_BIT(evbit,  EV_MAX);
340                 MATCH_BIT(keybit, KEY_MAX);
341                 MATCH_BIT(relbit, REL_MAX);
342                 MATCH_BIT(absbit, ABS_MAX);
343                 MATCH_BIT(mscbit, MSC_MAX);
344                 MATCH_BIT(ledbit, LED_MAX);
345                 MATCH_BIT(sndbit, SND_MAX);
346                 MATCH_BIT(ffbit,  FF_MAX);
347                 MATCH_BIT(swbit,  SW_MAX);
348
349                 return id;
350         }
351
352         return NULL;
353 }
354
355 #ifdef CONFIG_PROC_FS
356
357 static struct proc_dir_entry *proc_bus_input_dir;
358 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
359 static int input_devices_state;
360
361 static inline void input_wakeup_procfs_readers(void)
362 {
363         input_devices_state++;
364         wake_up(&input_devices_poll_wait);
365 }
366
367 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
368 {
369         int state = input_devices_state;
370
371         poll_wait(file, &input_devices_poll_wait, wait);
372         if (state != input_devices_state)
373                 return POLLIN | POLLRDNORM;
374
375         return 0;
376 }
377
378 static struct list_head *list_get_nth_element(struct list_head *list, loff_t *pos)
379 {
380         struct list_head *node;
381         loff_t i = 0;
382
383         list_for_each(node, list)
384                 if (i++ == *pos)
385                         return node;
386
387         return NULL;
388 }
389
390 static struct list_head *list_get_next_element(struct list_head *list, struct list_head *element, loff_t *pos)
391 {
392         if (element->next == list)
393                 return NULL;
394
395         ++(*pos);
396         return element->next;
397 }
398
399 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
400 {
401         /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
402
403         return list_get_nth_element(&input_dev_list, pos);
404 }
405
406 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
407 {
408         return list_get_next_element(&input_dev_list, v, pos);
409 }
410
411 static void input_devices_seq_stop(struct seq_file *seq, void *v)
412 {
413         /* release lock here */
414 }
415
416 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
417                                    unsigned long *bitmap, int max)
418 {
419         int i;
420
421         for (i = NBITS(max) - 1; i > 0; i--)
422                 if (bitmap[i])
423                         break;
424
425         seq_printf(seq, "B: %s=", name);
426         for (; i >= 0; i--)
427                 seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : "");
428         seq_putc(seq, '\n');
429 }
430
431 static int input_devices_seq_show(struct seq_file *seq, void *v)
432 {
433         struct input_dev *dev = container_of(v, struct input_dev, node);
434         const char *path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
435         struct input_handle *handle;
436
437         seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
438                    dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
439
440         seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
441         seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
442         seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
443         seq_printf(seq, "H: Handlers=");
444
445         list_for_each_entry(handle, &dev->h_list, d_node)
446                 seq_printf(seq, "%s ", handle->name);
447         seq_putc(seq, '\n');
448
449         input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
450         if (test_bit(EV_KEY, dev->evbit))
451                 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
452         if (test_bit(EV_REL, dev->evbit))
453                 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
454         if (test_bit(EV_ABS, dev->evbit))
455                 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
456         if (test_bit(EV_MSC, dev->evbit))
457                 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
458         if (test_bit(EV_LED, dev->evbit))
459                 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
460         if (test_bit(EV_SND, dev->evbit))
461                 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
462         if (test_bit(EV_FF, dev->evbit))
463                 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
464         if (test_bit(EV_SW, dev->evbit))
465                 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
466
467         seq_putc(seq, '\n');
468
469         kfree(path);
470         return 0;
471 }
472
473 static struct seq_operations input_devices_seq_ops = {
474         .start  = input_devices_seq_start,
475         .next   = input_devices_seq_next,
476         .stop   = input_devices_seq_stop,
477         .show   = input_devices_seq_show,
478 };
479
480 static int input_proc_devices_open(struct inode *inode, struct file *file)
481 {
482         return seq_open(file, &input_devices_seq_ops);
483 }
484
485 static struct file_operations input_devices_fileops = {
486         .owner          = THIS_MODULE,
487         .open           = input_proc_devices_open,
488         .poll           = input_proc_devices_poll,
489         .read           = seq_read,
490         .llseek         = seq_lseek,
491         .release        = seq_release,
492 };
493
494 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
495 {
496         /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
497         seq->private = (void *)(unsigned long)*pos;
498         return list_get_nth_element(&input_handler_list, pos);
499 }
500
501 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
502 {
503         seq->private = (void *)(unsigned long)(*pos + 1);
504         return list_get_next_element(&input_handler_list, v, pos);
505 }
506
507 static void input_handlers_seq_stop(struct seq_file *seq, void *v)
508 {
509         /* release lock here */
510 }
511
512 static int input_handlers_seq_show(struct seq_file *seq, void *v)
513 {
514         struct input_handler *handler = container_of(v, struct input_handler, node);
515
516         seq_printf(seq, "N: Number=%ld Name=%s",
517                    (unsigned long)seq->private, handler->name);
518         if (handler->fops)
519                 seq_printf(seq, " Minor=%d", handler->minor);
520         seq_putc(seq, '\n');
521
522         return 0;
523 }
524 static struct seq_operations input_handlers_seq_ops = {
525         .start  = input_handlers_seq_start,
526         .next   = input_handlers_seq_next,
527         .stop   = input_handlers_seq_stop,
528         .show   = input_handlers_seq_show,
529 };
530
531 static int input_proc_handlers_open(struct inode *inode, struct file *file)
532 {
533         return seq_open(file, &input_handlers_seq_ops);
534 }
535
536 static struct file_operations input_handlers_fileops = {
537         .owner          = THIS_MODULE,
538         .open           = input_proc_handlers_open,
539         .read           = seq_read,
540         .llseek         = seq_lseek,
541         .release        = seq_release,
542 };
543
544 static int __init input_proc_init(void)
545 {
546         struct proc_dir_entry *entry;
547
548         proc_bus_input_dir = proc_mkdir("input", proc_bus);
549         if (!proc_bus_input_dir)
550                 return -ENOMEM;
551
552         proc_bus_input_dir->owner = THIS_MODULE;
553
554         entry = create_proc_entry("devices", 0, proc_bus_input_dir);
555         if (!entry)
556                 goto fail1;
557
558         entry->owner = THIS_MODULE;
559         entry->proc_fops = &input_devices_fileops;
560
561         entry = create_proc_entry("handlers", 0, proc_bus_input_dir);
562         if (!entry)
563                 goto fail2;
564
565         entry->owner = THIS_MODULE;
566         entry->proc_fops = &input_handlers_fileops;
567
568         return 0;
569
570  fail2: remove_proc_entry("devices", proc_bus_input_dir);
571  fail1: remove_proc_entry("input", proc_bus);
572         return -ENOMEM;
573 }
574
575 static void input_proc_exit(void)
576 {
577         remove_proc_entry("devices", proc_bus_input_dir);
578         remove_proc_entry("handlers", proc_bus_input_dir);
579         remove_proc_entry("input", proc_bus);
580 }
581
582 #else /* !CONFIG_PROC_FS */
583 static inline void input_wakeup_procfs_readers(void) { }
584 static inline int input_proc_init(void) { return 0; }
585 static inline void input_proc_exit(void) { }
586 #endif
587
588 #define INPUT_DEV_STRING_ATTR_SHOW(name)                                        \
589 static ssize_t input_dev_show_##name(struct class_device *dev, char *buf)       \
590 {                                                                               \
591         struct input_dev *input_dev = to_input_dev(dev);                        \
592         int retval;                                                             \
593                                                                                 \
594         retval = mutex_lock_interruptible(&input_dev->mutex);                   \
595         if (retval)                                                             \
596                 return retval;                                                  \
597                                                                                 \
598         retval = scnprintf(buf, PAGE_SIZE,                                      \
599                            "%s\n", input_dev->name ? input_dev->name : "");     \
600                                                                                 \
601         mutex_unlock(&input_dev->mutex);                                        \
602                                                                                 \
603         return retval;                                                          \
604 }                                                                               \
605 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL);
606
607 INPUT_DEV_STRING_ATTR_SHOW(name);
608 INPUT_DEV_STRING_ATTR_SHOW(phys);
609 INPUT_DEV_STRING_ATTR_SHOW(uniq);
610
611 static int input_print_modalias_bits(char *buf, int size,
612                                      char name, unsigned long *bm,
613                                      unsigned int min_bit, unsigned int max_bit)
614 {
615         int len = 0, i;
616
617         len += snprintf(buf, max(size, 0), "%c", name);
618         for (i = min_bit; i < max_bit; i++)
619                 if (bm[LONG(i)] & BIT(i))
620                         len += snprintf(buf + len, max(size - len, 0), "%X,", i);
621         return len;
622 }
623
624 static int input_print_modalias(char *buf, int size, struct input_dev *id,
625                                 int add_cr)
626 {
627         int len;
628
629         len = snprintf(buf, max(size, 0),
630                        "input:b%04Xv%04Xp%04Xe%04X-",
631                        id->id.bustype, id->id.vendor,
632                        id->id.product, id->id.version);
633
634         len += input_print_modalias_bits(buf + len, size - len,
635                                 'e', id->evbit, 0, EV_MAX);
636         len += input_print_modalias_bits(buf + len, size - len,
637                                 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
638         len += input_print_modalias_bits(buf + len, size - len,
639                                 'r', id->relbit, 0, REL_MAX);
640         len += input_print_modalias_bits(buf + len, size - len,
641                                 'a', id->absbit, 0, ABS_MAX);
642         len += input_print_modalias_bits(buf + len, size - len,
643                                 'm', id->mscbit, 0, MSC_MAX);
644         len += input_print_modalias_bits(buf + len, size - len,
645                                 'l', id->ledbit, 0, LED_MAX);
646         len += input_print_modalias_bits(buf + len, size - len,
647                                 's', id->sndbit, 0, SND_MAX);
648         len += input_print_modalias_bits(buf + len, size - len,
649                                 'f', id->ffbit, 0, FF_MAX);
650         len += input_print_modalias_bits(buf + len, size - len,
651                                 'w', id->swbit, 0, SW_MAX);
652
653         if (add_cr)
654                 len += snprintf(buf + len, max(size - len, 0), "\n");
655
656         return len;
657 }
658
659 static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf)
660 {
661         struct input_dev *id = to_input_dev(dev);
662         ssize_t len;
663
664         len = input_print_modalias(buf, PAGE_SIZE, id, 1);
665
666         return min_t(int, len, PAGE_SIZE);
667 }
668 static CLASS_DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
669
670 static struct attribute *input_dev_attrs[] = {
671         &class_device_attr_name.attr,
672         &class_device_attr_phys.attr,
673         &class_device_attr_uniq.attr,
674         &class_device_attr_modalias.attr,
675         NULL
676 };
677
678 static struct attribute_group input_dev_attr_group = {
679         .attrs  = input_dev_attrs,
680 };
681
682 #define INPUT_DEV_ID_ATTR(name)                                                 \
683 static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf)    \
684 {                                                                               \
685         struct input_dev *input_dev = to_input_dev(dev);                        \
686         return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name);         \
687 }                                                                               \
688 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL);
689
690 INPUT_DEV_ID_ATTR(bustype);
691 INPUT_DEV_ID_ATTR(vendor);
692 INPUT_DEV_ID_ATTR(product);
693 INPUT_DEV_ID_ATTR(version);
694
695 static struct attribute *input_dev_id_attrs[] = {
696         &class_device_attr_bustype.attr,
697         &class_device_attr_vendor.attr,
698         &class_device_attr_product.attr,
699         &class_device_attr_version.attr,
700         NULL
701 };
702
703 static struct attribute_group input_dev_id_attr_group = {
704         .name   = "id",
705         .attrs  = input_dev_id_attrs,
706 };
707
708 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
709                               int max, int add_cr)
710 {
711         int i;
712         int len = 0;
713
714         for (i = NBITS(max) - 1; i > 0; i--)
715                 if (bitmap[i])
716                         break;
717
718         for (; i >= 0; i--)
719                 len += snprintf(buf + len, max(buf_size - len, 0),
720                                 "%lx%s", bitmap[i], i > 0 ? " " : "");
721
722         if (add_cr)
723                 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
724
725         return len;
726 }
727
728 #define INPUT_DEV_CAP_ATTR(ev, bm)                                              \
729 static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf)     \
730 {                                                                               \
731         struct input_dev *input_dev = to_input_dev(dev);                        \
732         int len = input_print_bitmap(buf, PAGE_SIZE,                            \
733                                      input_dev->bm##bit, ev##_MAX, 1);          \
734         return min_t(int, len, PAGE_SIZE);                                      \
735 }                                                                               \
736 static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL);
737
738 INPUT_DEV_CAP_ATTR(EV, ev);
739 INPUT_DEV_CAP_ATTR(KEY, key);
740 INPUT_DEV_CAP_ATTR(REL, rel);
741 INPUT_DEV_CAP_ATTR(ABS, abs);
742 INPUT_DEV_CAP_ATTR(MSC, msc);
743 INPUT_DEV_CAP_ATTR(LED, led);
744 INPUT_DEV_CAP_ATTR(SND, snd);
745 INPUT_DEV_CAP_ATTR(FF, ff);
746 INPUT_DEV_CAP_ATTR(SW, sw);
747
748 static struct attribute *input_dev_caps_attrs[] = {
749         &class_device_attr_ev.attr,
750         &class_device_attr_key.attr,
751         &class_device_attr_rel.attr,
752         &class_device_attr_abs.attr,
753         &class_device_attr_msc.attr,
754         &class_device_attr_led.attr,
755         &class_device_attr_snd.attr,
756         &class_device_attr_ff.attr,
757         &class_device_attr_sw.attr,
758         NULL
759 };
760
761 static struct attribute_group input_dev_caps_attr_group = {
762         .name   = "capabilities",
763         .attrs  = input_dev_caps_attrs,
764 };
765
766 static void input_dev_release(struct class_device *class_dev)
767 {
768         struct input_dev *dev = to_input_dev(class_dev);
769
770         input_ff_destroy(dev);
771         kfree(dev);
772
773         module_put(THIS_MODULE);
774 }
775
776 /*
777  * Input uevent interface - loading event handlers based on
778  * device bitfields.
779  */
780 static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index,
781                                    char *buffer, int buffer_size, int *cur_len,
782                                    const char *name, unsigned long *bitmap, int max)
783 {
784         if (*cur_index >= num_envp - 1)
785                 return -ENOMEM;
786
787         envp[*cur_index] = buffer + *cur_len;
788
789         *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name);
790         if (*cur_len >= buffer_size)
791                 return -ENOMEM;
792
793         *cur_len += input_print_bitmap(buffer + *cur_len,
794                                         max(buffer_size - *cur_len, 0),
795                                         bitmap, max, 0) + 1;
796         if (*cur_len > buffer_size)
797                 return -ENOMEM;
798
799         (*cur_index)++;
800         return 0;
801 }
802
803 static int input_add_uevent_modalias_var(char **envp, int num_envp, int *cur_index,
804                                          char *buffer, int buffer_size, int *cur_len,
805                                          struct input_dev *dev)
806 {
807         if (*cur_index >= num_envp - 1)
808                 return -ENOMEM;
809
810         envp[*cur_index] = buffer + *cur_len;
811
812         *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0),
813                              "MODALIAS=");
814         if (*cur_len >= buffer_size)
815                 return -ENOMEM;
816
817         *cur_len += input_print_modalias(buffer + *cur_len,
818                                          max(buffer_size - *cur_len, 0),
819                                          dev, 0) + 1;
820         if (*cur_len > buffer_size)
821                 return -ENOMEM;
822
823         (*cur_index)++;
824         return 0;
825 }
826
827 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...)                              \
828         do {                                                            \
829                 int err = add_uevent_var(envp, num_envp, &i,            \
830                                         buffer, buffer_size, &len,      \
831                                         fmt, val);                      \
832                 if (err)                                                \
833                         return err;                                     \
834         } while (0)
835
836 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max)                         \
837         do {                                                            \
838                 int err = input_add_uevent_bm_var(envp, num_envp, &i,   \
839                                         buffer, buffer_size, &len,      \
840                                         name, bm, max);                 \
841                 if (err)                                                \
842                         return err;                                     \
843         } while (0)
844
845 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev)                             \
846         do {                                                            \
847                 int err = input_add_uevent_modalias_var(envp,           \
848                                         num_envp, &i,                   \
849                                         buffer, buffer_size, &len,      \
850                                         dev);                           \
851                 if (err)                                                \
852                         return err;                                     \
853         } while (0)
854
855 static int input_dev_uevent(struct class_device *cdev, char **envp,
856                             int num_envp, char *buffer, int buffer_size)
857 {
858         struct input_dev *dev = to_input_dev(cdev);
859         int i = 0;
860         int len = 0;
861
862         INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
863                                 dev->id.bustype, dev->id.vendor,
864                                 dev->id.product, dev->id.version);
865         if (dev->name)
866                 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
867         if (dev->phys)
868                 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
869         if (dev->uniq)
870                 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
871
872         INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
873         if (test_bit(EV_KEY, dev->evbit))
874                 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
875         if (test_bit(EV_REL, dev->evbit))
876                 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
877         if (test_bit(EV_ABS, dev->evbit))
878                 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
879         if (test_bit(EV_MSC, dev->evbit))
880                 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
881         if (test_bit(EV_LED, dev->evbit))
882                 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
883         if (test_bit(EV_SND, dev->evbit))
884                 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
885         if (test_bit(EV_FF, dev->evbit))
886                 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
887         if (test_bit(EV_SW, dev->evbit))
888                 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
889
890         INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
891
892         envp[i] = NULL;
893         return 0;
894 }
895
896 struct class input_class = {
897         .name                   = "input",
898         .release                = input_dev_release,
899         .uevent                 = input_dev_uevent,
900 };
901 EXPORT_SYMBOL_GPL(input_class);
902
903 /**
904  * input_allocate_device - allocate memory for new input device
905  *
906  * Returns prepared struct input_dev or NULL.
907  *
908  * NOTE: Use input_free_device() to free devices that have not been
909  * registered; input_unregister_device() should be used for already
910  * registered devices.
911  */
912 struct input_dev *input_allocate_device(void)
913 {
914         struct input_dev *dev;
915
916         dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
917         if (dev) {
918                 dev->cdev.class = &input_class;
919                 class_device_initialize(&dev->cdev);
920                 mutex_init(&dev->mutex);
921                 INIT_LIST_HEAD(&dev->h_list);
922                 INIT_LIST_HEAD(&dev->node);
923
924                 __module_get(THIS_MODULE);
925         }
926
927         return dev;
928 }
929 EXPORT_SYMBOL(input_allocate_device);
930
931 /**
932  * input_free_device - free memory occupied by input_dev structure
933  * @dev: input device to free
934  *
935  * This function should only be used if input_register_device()
936  * was not called yet or if it failed. Once device was registered
937  * use input_unregister_device() and memory will be freed once last
938  * refrence to the device is dropped.
939  *
940  * Device should be allocated by input_allocate_device().
941  *
942  * NOTE: If there are references to the input device then memory
943  * will not be freed until last reference is dropped.
944  */
945 void input_free_device(struct input_dev *dev)
946 {
947         if (dev) {
948
949                 mutex_lock(&dev->mutex);
950                 dev->name = dev->phys = dev->uniq = NULL;
951                 mutex_unlock(&dev->mutex);
952
953                 input_put_device(dev);
954         }
955 }
956 EXPORT_SYMBOL(input_free_device);
957
958 int input_register_device(struct input_dev *dev)
959 {
960         static atomic_t input_no = ATOMIC_INIT(0);
961         struct input_handle *handle;
962         struct input_handler *handler;
963         const struct input_device_id *id;
964         const char *path;
965         int error;
966
967         set_bit(EV_SYN, dev->evbit);
968
969         /*
970          * If delay and period are pre-set by the driver, then autorepeating
971          * is handled by the driver itself and we don't do it in input.c.
972          */
973
974         init_timer(&dev->timer);
975         if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
976                 dev->timer.data = (long) dev;
977                 dev->timer.function = input_repeat_key;
978                 dev->rep[REP_DELAY] = 250;
979                 dev->rep[REP_PERIOD] = 33;
980         }
981
982         list_add_tail(&dev->node, &input_dev_list);
983
984         snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id),
985                  "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
986
987         error = class_device_add(&dev->cdev);
988         if (error)
989                 return error;
990
991         error = sysfs_create_group(&dev->cdev.kobj, &input_dev_attr_group);
992         if (error)
993                 goto fail1;
994
995         error = sysfs_create_group(&dev->cdev.kobj, &input_dev_id_attr_group);
996         if (error)
997                 goto fail2;
998
999         error = sysfs_create_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
1000         if (error)
1001                 goto fail3;
1002
1003         path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
1004         printk(KERN_INFO "input: %s as %s\n",
1005                 dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
1006         kfree(path);
1007
1008         list_for_each_entry(handler, &input_handler_list, node)
1009                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
1010                         if ((id = input_match_device(handler->id_table, dev)))
1011                                 if ((handle = handler->connect(handler, dev, id))) {
1012                                         input_link_handle(handle);
1013                                         if (handler->start)
1014                                                 handler->start(handle);
1015                                 }
1016
1017         input_wakeup_procfs_readers();
1018
1019         return 0;
1020
1021  fail3: sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
1022  fail2: sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
1023  fail1: class_device_del(&dev->cdev);
1024         return error;
1025 }
1026 EXPORT_SYMBOL(input_register_device);
1027
1028 void input_unregister_device(struct input_dev *dev)
1029 {
1030         struct list_head *node, *next;
1031         int code;
1032
1033         for (code = 0; code <= KEY_MAX; code++)
1034                 if (test_bit(code, dev->key))
1035                         input_report_key(dev, code, 0);
1036         input_sync(dev);
1037
1038         del_timer_sync(&dev->timer);
1039
1040         list_for_each_safe(node, next, &dev->h_list) {
1041                 struct input_handle * handle = to_handle(node);
1042                 list_del_init(&handle->d_node);
1043                 list_del_init(&handle->h_node);
1044                 handle->handler->disconnect(handle);
1045         }
1046
1047         list_del_init(&dev->node);
1048
1049         sysfs_remove_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
1050         sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
1051         sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
1052
1053         mutex_lock(&dev->mutex);
1054         dev->name = dev->phys = dev->uniq = NULL;
1055         mutex_unlock(&dev->mutex);
1056
1057         class_device_unregister(&dev->cdev);
1058
1059         input_wakeup_procfs_readers();
1060 }
1061 EXPORT_SYMBOL(input_unregister_device);
1062
1063 int input_register_handler(struct input_handler *handler)
1064 {
1065         struct input_dev *dev;
1066         struct input_handle *handle;
1067         const struct input_device_id *id;
1068
1069         INIT_LIST_HEAD(&handler->h_list);
1070
1071         if (handler->fops != NULL) {
1072                 if (input_table[handler->minor >> 5])
1073                         return -EBUSY;
1074
1075                 input_table[handler->minor >> 5] = handler;
1076         }
1077
1078         list_add_tail(&handler->node, &input_handler_list);
1079
1080         list_for_each_entry(dev, &input_dev_list, node)
1081                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
1082                         if ((id = input_match_device(handler->id_table, dev)))
1083                                 if ((handle = handler->connect(handler, dev, id))) {
1084                                         input_link_handle(handle);
1085                                         if (handler->start)
1086                                                 handler->start(handle);
1087                                 }
1088
1089         input_wakeup_procfs_readers();
1090         return 0;
1091 }
1092 EXPORT_SYMBOL(input_register_handler);
1093
1094 void input_unregister_handler(struct input_handler *handler)
1095 {
1096         struct list_head *node, *next;
1097
1098         list_for_each_safe(node, next, &handler->h_list) {
1099                 struct input_handle * handle = to_handle_h(node);
1100                 list_del_init(&handle->h_node);
1101                 list_del_init(&handle->d_node);
1102                 handler->disconnect(handle);
1103         }
1104
1105         list_del_init(&handler->node);
1106
1107         if (handler->fops != NULL)
1108                 input_table[handler->minor >> 5] = NULL;
1109
1110         input_wakeup_procfs_readers();
1111 }
1112 EXPORT_SYMBOL(input_unregister_handler);
1113
1114 static int input_open_file(struct inode *inode, struct file *file)
1115 {
1116         struct input_handler *handler = input_table[iminor(inode) >> 5];
1117         const struct file_operations *old_fops, *new_fops = NULL;
1118         int err;
1119
1120         /* No load-on-demand here? */
1121         if (!handler || !(new_fops = fops_get(handler->fops)))
1122                 return -ENODEV;
1123
1124         /*
1125          * That's _really_ odd. Usually NULL ->open means "nothing special",
1126          * not "no device". Oh, well...
1127          */
1128         if (!new_fops->open) {
1129                 fops_put(new_fops);
1130                 return -ENODEV;
1131         }
1132         old_fops = file->f_op;
1133         file->f_op = new_fops;
1134
1135         err = new_fops->open(inode, file);
1136
1137         if (err) {
1138                 fops_put(file->f_op);
1139                 file->f_op = fops_get(old_fops);
1140         }
1141         fops_put(old_fops);
1142         return err;
1143 }
1144
1145 static struct file_operations input_fops = {
1146         .owner = THIS_MODULE,
1147         .open = input_open_file,
1148 };
1149
1150 static int __init input_init(void)
1151 {
1152         int err;
1153
1154         err = class_register(&input_class);
1155         if (err) {
1156                 printk(KERN_ERR "input: unable to register input_dev class\n");
1157                 return err;
1158         }
1159
1160         err = input_proc_init();
1161         if (err)
1162                 goto fail1;
1163
1164         err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
1165         if (err) {
1166                 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
1167                 goto fail2;
1168         }
1169
1170         return 0;
1171
1172  fail2: input_proc_exit();
1173  fail1: class_unregister(&input_class);
1174         return err;
1175 }
1176
1177 static void __exit input_exit(void)
1178 {
1179         input_proc_exit();
1180         unregister_chrdev(INPUT_MAJOR, "input");
1181         class_unregister(&input_class);
1182 }
1183
1184 subsys_initcall(input_init);
1185 module_exit(input_exit);