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