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Commit | Line | Data |
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1da177e4 LT |
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> | |
969b21cd | 21 | #include <linux/seq_file.h> |
1da177e4 LT |
22 | #include <linux/interrupt.h> |
23 | #include <linux/poll.h> | |
24 | #include <linux/device.h> | |
e676c232 | 25 | #include <linux/mutex.h> |
1da177e4 LT |
26 | |
27 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>"); | |
28 | MODULE_DESCRIPTION("Input core"); | |
29 | MODULE_LICENSE("GPL"); | |
30 | ||
d19fbe8a | 31 | EXPORT_SYMBOL(input_allocate_device); |
f60d2b11 | 32 | EXPORT_SYMBOL(input_free_device); |
1da177e4 LT |
33 | EXPORT_SYMBOL(input_register_device); |
34 | EXPORT_SYMBOL(input_unregister_device); | |
35 | EXPORT_SYMBOL(input_register_handler); | |
36 | EXPORT_SYMBOL(input_unregister_handler); | |
37 | EXPORT_SYMBOL(input_grab_device); | |
38 | EXPORT_SYMBOL(input_release_device); | |
39 | EXPORT_SYMBOL(input_open_device); | |
40 | EXPORT_SYMBOL(input_close_device); | |
41 | EXPORT_SYMBOL(input_accept_process); | |
42 | EXPORT_SYMBOL(input_flush_device); | |
43 | EXPORT_SYMBOL(input_event); | |
ea9f240b | 44 | EXPORT_SYMBOL_GPL(input_class); |
1da177e4 LT |
45 | |
46 | #define INPUT_DEVICES 256 | |
47 | ||
48 | static LIST_HEAD(input_dev_list); | |
49 | static LIST_HEAD(input_handler_list); | |
50 | ||
51 | static struct input_handler *input_table[8]; | |
52 | ||
1da177e4 LT |
53 | void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) |
54 | { | |
55 | struct input_handle *handle; | |
56 | ||
57 | if (type > EV_MAX || !test_bit(type, dev->evbit)) | |
58 | return; | |
59 | ||
60 | add_input_randomness(type, code, value); | |
61 | ||
62 | switch (type) { | |
63 | ||
64 | case EV_SYN: | |
65 | switch (code) { | |
66 | case SYN_CONFIG: | |
1e0afb28 DT |
67 | if (dev->event) |
68 | dev->event(dev, type, code, value); | |
1da177e4 LT |
69 | break; |
70 | ||
71 | case SYN_REPORT: | |
1e0afb28 DT |
72 | if (dev->sync) |
73 | return; | |
1da177e4 LT |
74 | dev->sync = 1; |
75 | break; | |
76 | } | |
77 | break; | |
78 | ||
79 | case EV_KEY: | |
80 | ||
81 | if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value) | |
82 | return; | |
83 | ||
84 | if (value == 2) | |
85 | break; | |
86 | ||
87 | change_bit(code, dev->key); | |
88 | ||
89 | if (test_bit(EV_REP, dev->evbit) && dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && dev->timer.data && value) { | |
90 | dev->repeat_key = code; | |
91 | mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_DELAY])); | |
92 | } | |
93 | ||
94 | break; | |
95 | ||
31581066 RP |
96 | case EV_SW: |
97 | ||
98 | if (code > SW_MAX || !test_bit(code, dev->swbit) || !!test_bit(code, dev->sw) == value) | |
99 | return; | |
100 | ||
101 | change_bit(code, dev->sw); | |
102 | ||
103 | break; | |
104 | ||
1da177e4 LT |
105 | case EV_ABS: |
106 | ||
107 | if (code > ABS_MAX || !test_bit(code, dev->absbit)) | |
108 | return; | |
109 | ||
110 | if (dev->absfuzz[code]) { | |
111 | if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) && | |
112 | (value < dev->abs[code] + (dev->absfuzz[code] >> 1))) | |
113 | return; | |
114 | ||
115 | if ((value > dev->abs[code] - dev->absfuzz[code]) && | |
116 | (value < dev->abs[code] + dev->absfuzz[code])) | |
117 | value = (dev->abs[code] * 3 + value) >> 2; | |
118 | ||
119 | if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) && | |
120 | (value < dev->abs[code] + (dev->absfuzz[code] << 1))) | |
121 | value = (dev->abs[code] + value) >> 1; | |
122 | } | |
123 | ||
124 | if (dev->abs[code] == value) | |
125 | return; | |
126 | ||
127 | dev->abs[code] = value; | |
128 | break; | |
129 | ||
130 | case EV_REL: | |
131 | ||
132 | if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0)) | |
133 | return; | |
134 | ||
135 | break; | |
136 | ||
137 | case EV_MSC: | |
138 | ||
139 | if (code > MSC_MAX || !test_bit(code, dev->mscbit)) | |
140 | return; | |
141 | ||
1e0afb28 DT |
142 | if (dev->event) |
143 | dev->event(dev, type, code, value); | |
1da177e4 LT |
144 | |
145 | break; | |
146 | ||
147 | case EV_LED: | |
148 | ||
149 | if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value) | |
150 | return; | |
151 | ||
152 | change_bit(code, dev->led); | |
1e0afb28 DT |
153 | |
154 | if (dev->event) | |
155 | dev->event(dev, type, code, value); | |
1da177e4 LT |
156 | |
157 | break; | |
158 | ||
159 | case EV_SND: | |
160 | ||
161 | if (code > SND_MAX || !test_bit(code, dev->sndbit)) | |
162 | return; | |
163 | ||
8fdc1948 DT |
164 | if (!!test_bit(code, dev->snd) != !!value) |
165 | change_bit(code, dev->snd); | |
166 | ||
1e0afb28 DT |
167 | if (dev->event) |
168 | dev->event(dev, type, code, value); | |
1da177e4 LT |
169 | |
170 | break; | |
171 | ||
172 | case EV_REP: | |
173 | ||
1e0afb28 DT |
174 | if (code > REP_MAX || value < 0 || dev->rep[code] == value) |
175 | return; | |
1da177e4 LT |
176 | |
177 | dev->rep[code] = value; | |
1e0afb28 DT |
178 | if (dev->event) |
179 | dev->event(dev, type, code, value); | |
1da177e4 LT |
180 | |
181 | break; | |
182 | ||
183 | case EV_FF: | |
1e0afb28 DT |
184 | if (dev->event) |
185 | dev->event(dev, type, code, value); | |
1da177e4 LT |
186 | break; |
187 | } | |
188 | ||
189 | if (type != EV_SYN) | |
190 | dev->sync = 0; | |
191 | ||
192 | if (dev->grab) | |
193 | dev->grab->handler->event(dev->grab, type, code, value); | |
194 | else | |
195 | list_for_each_entry(handle, &dev->h_list, d_node) | |
196 | if (handle->open) | |
197 | handle->handler->event(handle, type, code, value); | |
198 | } | |
199 | ||
200 | static void input_repeat_key(unsigned long data) | |
201 | { | |
202 | struct input_dev *dev = (void *) data; | |
203 | ||
204 | if (!test_bit(dev->repeat_key, dev->key)) | |
205 | return; | |
206 | ||
207 | input_event(dev, EV_KEY, dev->repeat_key, 2); | |
208 | input_sync(dev); | |
209 | ||
210 | if (dev->rep[REP_PERIOD]) | |
211 | mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD])); | |
212 | } | |
213 | ||
214 | int input_accept_process(struct input_handle *handle, struct file *file) | |
215 | { | |
216 | if (handle->dev->accept) | |
217 | return handle->dev->accept(handle->dev, file); | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
222 | int input_grab_device(struct input_handle *handle) | |
223 | { | |
224 | if (handle->dev->grab) | |
225 | return -EBUSY; | |
226 | ||
227 | handle->dev->grab = handle; | |
228 | return 0; | |
229 | } | |
230 | ||
231 | void input_release_device(struct input_handle *handle) | |
232 | { | |
233 | if (handle->dev->grab == handle) | |
234 | handle->dev->grab = NULL; | |
235 | } | |
236 | ||
237 | int input_open_device(struct input_handle *handle) | |
238 | { | |
0fbf87ca DT |
239 | struct input_dev *dev = handle->dev; |
240 | int err; | |
241 | ||
e676c232 | 242 | err = mutex_lock_interruptible(&dev->mutex); |
0fbf87ca DT |
243 | if (err) |
244 | return err; | |
245 | ||
1da177e4 | 246 | handle->open++; |
0fbf87ca DT |
247 | |
248 | if (!dev->users++ && dev->open) | |
249 | err = dev->open(dev); | |
250 | ||
251 | if (err) | |
252 | handle->open--; | |
253 | ||
e676c232 | 254 | mutex_unlock(&dev->mutex); |
0fbf87ca DT |
255 | |
256 | return err; | |
1da177e4 LT |
257 | } |
258 | ||
259 | int input_flush_device(struct input_handle* handle, struct file* file) | |
260 | { | |
261 | if (handle->dev->flush) | |
262 | return handle->dev->flush(handle->dev, file); | |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
267 | void input_close_device(struct input_handle *handle) | |
268 | { | |
0fbf87ca DT |
269 | struct input_dev *dev = handle->dev; |
270 | ||
1da177e4 | 271 | input_release_device(handle); |
0fbf87ca | 272 | |
e676c232 | 273 | mutex_lock(&dev->mutex); |
0fbf87ca DT |
274 | |
275 | if (!--dev->users && dev->close) | |
276 | dev->close(dev); | |
1da177e4 | 277 | handle->open--; |
0fbf87ca | 278 | |
e676c232 | 279 | mutex_unlock(&dev->mutex); |
1da177e4 LT |
280 | } |
281 | ||
282 | static void input_link_handle(struct input_handle *handle) | |
283 | { | |
284 | list_add_tail(&handle->d_node, &handle->dev->h_list); | |
285 | list_add_tail(&handle->h_node, &handle->handler->h_list); | |
286 | } | |
287 | ||
288 | #define MATCH_BIT(bit, max) \ | |
289 | for (i = 0; i < NBITS(max); i++) \ | |
290 | if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \ | |
291 | break; \ | |
292 | if (i != NBITS(max)) \ | |
293 | continue; | |
294 | ||
295 | static struct input_device_id *input_match_device(struct input_device_id *id, struct input_dev *dev) | |
296 | { | |
297 | int i; | |
298 | ||
299 | for (; id->flags || id->driver_info; id++) { | |
300 | ||
301 | if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) | |
ddc5d341 | 302 | if (id->bustype != dev->id.bustype) |
1da177e4 LT |
303 | continue; |
304 | ||
305 | if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) | |
ddc5d341 | 306 | if (id->vendor != dev->id.vendor) |
1da177e4 LT |
307 | continue; |
308 | ||
309 | if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) | |
ddc5d341 | 310 | if (id->product != dev->id.product) |
1da177e4 LT |
311 | continue; |
312 | ||
313 | if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) | |
ddc5d341 | 314 | if (id->version != dev->id.version) |
1da177e4 LT |
315 | continue; |
316 | ||
317 | MATCH_BIT(evbit, EV_MAX); | |
318 | MATCH_BIT(keybit, KEY_MAX); | |
319 | MATCH_BIT(relbit, REL_MAX); | |
320 | MATCH_BIT(absbit, ABS_MAX); | |
321 | MATCH_BIT(mscbit, MSC_MAX); | |
322 | MATCH_BIT(ledbit, LED_MAX); | |
323 | MATCH_BIT(sndbit, SND_MAX); | |
324 | MATCH_BIT(ffbit, FF_MAX); | |
ff13f98b | 325 | MATCH_BIT(swbit, SW_MAX); |
1da177e4 LT |
326 | |
327 | return id; | |
328 | } | |
329 | ||
330 | return NULL; | |
331 | } | |
332 | ||
f96b434d DT |
333 | #ifdef CONFIG_PROC_FS |
334 | ||
335 | static struct proc_dir_entry *proc_bus_input_dir; | |
336 | static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); | |
337 | static int input_devices_state; | |
338 | ||
339 | static inline void input_wakeup_procfs_readers(void) | |
340 | { | |
341 | input_devices_state++; | |
342 | wake_up(&input_devices_poll_wait); | |
343 | } | |
344 | ||
969b21cd | 345 | static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait) |
f96b434d DT |
346 | { |
347 | int state = input_devices_state; | |
1e0afb28 | 348 | |
f96b434d DT |
349 | poll_wait(file, &input_devices_poll_wait, wait); |
350 | if (state != input_devices_state) | |
351 | return POLLIN | POLLRDNORM; | |
1e0afb28 | 352 | |
f96b434d DT |
353 | return 0; |
354 | } | |
355 | ||
969b21cd DT |
356 | static struct list_head *list_get_nth_element(struct list_head *list, loff_t *pos) |
357 | { | |
358 | struct list_head *node; | |
359 | loff_t i = 0; | |
f96b434d | 360 | |
969b21cd DT |
361 | list_for_each(node, list) |
362 | if (i++ == *pos) | |
363 | return node; | |
364 | ||
365 | return NULL; | |
366 | } | |
f96b434d | 367 | |
969b21cd | 368 | static struct list_head *list_get_next_element(struct list_head *list, struct list_head *element, loff_t *pos) |
f96b434d | 369 | { |
969b21cd DT |
370 | if (element->next == list) |
371 | return NULL; | |
f96b434d | 372 | |
969b21cd DT |
373 | ++(*pos); |
374 | return element->next; | |
375 | } | |
f96b434d | 376 | |
969b21cd DT |
377 | static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) |
378 | { | |
379 | /* acquire lock here ... Yes, we do need locking, I knowi, I know... */ | |
f96b434d | 380 | |
969b21cd DT |
381 | return list_get_nth_element(&input_dev_list, pos); |
382 | } | |
051b2fea | 383 | |
969b21cd DT |
384 | static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
385 | { | |
386 | return list_get_next_element(&input_dev_list, v, pos); | |
387 | } | |
f96b434d | 388 | |
969b21cd DT |
389 | static void input_devices_seq_stop(struct seq_file *seq, void *v) |
390 | { | |
391 | /* release lock here */ | |
392 | } | |
f96b434d | 393 | |
969b21cd DT |
394 | static void input_seq_print_bitmap(struct seq_file *seq, const char *name, |
395 | unsigned long *bitmap, int max) | |
396 | { | |
397 | int i; | |
051b2fea | 398 | |
969b21cd DT |
399 | for (i = NBITS(max) - 1; i > 0; i--) |
400 | if (bitmap[i]) | |
401 | break; | |
f96b434d | 402 | |
969b21cd DT |
403 | seq_printf(seq, "B: %s=", name); |
404 | for (; i >= 0; i--) | |
405 | seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : ""); | |
406 | seq_putc(seq, '\n'); | |
407 | } | |
f96b434d | 408 | |
969b21cd DT |
409 | static int input_devices_seq_show(struct seq_file *seq, void *v) |
410 | { | |
411 | struct input_dev *dev = container_of(v, struct input_dev, node); | |
412 | const char *path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL); | |
413 | struct input_handle *handle; | |
414 | ||
415 | seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", | |
416 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); | |
417 | ||
418 | seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); | |
419 | seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : ""); | |
420 | seq_printf(seq, "S: Sysfs=%s\n", path ? path : ""); | |
421 | seq_printf(seq, "H: Handlers="); | |
422 | ||
423 | list_for_each_entry(handle, &dev->h_list, d_node) | |
424 | seq_printf(seq, "%s ", handle->name); | |
425 | seq_putc(seq, '\n'); | |
426 | ||
427 | input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); | |
428 | if (test_bit(EV_KEY, dev->evbit)) | |
429 | input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); | |
430 | if (test_bit(EV_REL, dev->evbit)) | |
431 | input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); | |
432 | if (test_bit(EV_ABS, dev->evbit)) | |
433 | input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); | |
434 | if (test_bit(EV_MSC, dev->evbit)) | |
435 | input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); | |
436 | if (test_bit(EV_LED, dev->evbit)) | |
437 | input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); | |
438 | if (test_bit(EV_SND, dev->evbit)) | |
439 | input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); | |
440 | if (test_bit(EV_FF, dev->evbit)) | |
441 | input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); | |
442 | if (test_bit(EV_SW, dev->evbit)) | |
443 | input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); | |
444 | ||
445 | seq_putc(seq, '\n'); | |
446 | ||
447 | kfree(path); | |
448 | return 0; | |
f96b434d DT |
449 | } |
450 | ||
969b21cd DT |
451 | static struct seq_operations input_devices_seq_ops = { |
452 | .start = input_devices_seq_start, | |
453 | .next = input_devices_seq_next, | |
454 | .stop = input_devices_seq_stop, | |
455 | .show = input_devices_seq_show, | |
456 | }; | |
457 | ||
458 | static int input_proc_devices_open(struct inode *inode, struct file *file) | |
f96b434d | 459 | { |
969b21cd DT |
460 | return seq_open(file, &input_devices_seq_ops); |
461 | } | |
462 | ||
463 | static struct file_operations input_devices_fileops = { | |
464 | .owner = THIS_MODULE, | |
465 | .open = input_proc_devices_open, | |
466 | .poll = input_proc_devices_poll, | |
467 | .read = seq_read, | |
468 | .llseek = seq_lseek, | |
469 | .release = seq_release, | |
470 | }; | |
471 | ||
472 | static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) | |
473 | { | |
474 | /* acquire lock here ... Yes, we do need locking, I knowi, I know... */ | |
475 | seq->private = (void *)(unsigned long)*pos; | |
476 | return list_get_nth_element(&input_handler_list, pos); | |
477 | } | |
f96b434d | 478 | |
969b21cd DT |
479 | static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
480 | { | |
481 | seq->private = (void *)(unsigned long)(*pos + 1); | |
482 | return list_get_next_element(&input_handler_list, v, pos); | |
f96b434d DT |
483 | } |
484 | ||
969b21cd DT |
485 | static void input_handlers_seq_stop(struct seq_file *seq, void *v) |
486 | { | |
487 | /* release lock here */ | |
488 | } | |
489 | ||
490 | static int input_handlers_seq_show(struct seq_file *seq, void *v) | |
491 | { | |
492 | struct input_handler *handler = container_of(v, struct input_handler, node); | |
493 | ||
494 | seq_printf(seq, "N: Number=%ld Name=%s", | |
495 | (unsigned long)seq->private, handler->name); | |
496 | if (handler->fops) | |
497 | seq_printf(seq, " Minor=%d", handler->minor); | |
498 | seq_putc(seq, '\n'); | |
499 | ||
500 | return 0; | |
501 | } | |
502 | static struct seq_operations input_handlers_seq_ops = { | |
503 | .start = input_handlers_seq_start, | |
504 | .next = input_handlers_seq_next, | |
505 | .stop = input_handlers_seq_stop, | |
506 | .show = input_handlers_seq_show, | |
507 | }; | |
508 | ||
509 | static int input_proc_handlers_open(struct inode *inode, struct file *file) | |
510 | { | |
511 | return seq_open(file, &input_handlers_seq_ops); | |
512 | } | |
513 | ||
514 | static struct file_operations input_handlers_fileops = { | |
515 | .owner = THIS_MODULE, | |
516 | .open = input_proc_handlers_open, | |
517 | .read = seq_read, | |
518 | .llseek = seq_lseek, | |
519 | .release = seq_release, | |
520 | }; | |
f96b434d DT |
521 | |
522 | static int __init input_proc_init(void) | |
523 | { | |
524 | struct proc_dir_entry *entry; | |
525 | ||
526 | proc_bus_input_dir = proc_mkdir("input", proc_bus); | |
527 | if (!proc_bus_input_dir) | |
528 | return -ENOMEM; | |
529 | ||
530 | proc_bus_input_dir->owner = THIS_MODULE; | |
531 | ||
969b21cd | 532 | entry = create_proc_entry("devices", 0, proc_bus_input_dir); |
f96b434d DT |
533 | if (!entry) |
534 | goto fail1; | |
535 | ||
536 | entry->owner = THIS_MODULE; | |
969b21cd | 537 | entry->proc_fops = &input_devices_fileops; |
f96b434d | 538 | |
969b21cd | 539 | entry = create_proc_entry("handlers", 0, proc_bus_input_dir); |
f96b434d DT |
540 | if (!entry) |
541 | goto fail2; | |
542 | ||
543 | entry->owner = THIS_MODULE; | |
969b21cd | 544 | entry->proc_fops = &input_handlers_fileops; |
f96b434d DT |
545 | |
546 | return 0; | |
547 | ||
548 | fail2: remove_proc_entry("devices", proc_bus_input_dir); | |
549 | fail1: remove_proc_entry("input", proc_bus); | |
550 | return -ENOMEM; | |
551 | } | |
552 | ||
beffbdc2 | 553 | static void input_proc_exit(void) |
f96b434d DT |
554 | { |
555 | remove_proc_entry("devices", proc_bus_input_dir); | |
556 | remove_proc_entry("handlers", proc_bus_input_dir); | |
557 | remove_proc_entry("input", proc_bus); | |
558 | } | |
559 | ||
560 | #else /* !CONFIG_PROC_FS */ | |
561 | static inline void input_wakeup_procfs_readers(void) { } | |
562 | static inline int input_proc_init(void) { return 0; } | |
563 | static inline void input_proc_exit(void) { } | |
564 | #endif | |
565 | ||
5c1e9a6a DT |
566 | #define INPUT_DEV_STRING_ATTR_SHOW(name) \ |
567 | static ssize_t input_dev_show_##name(struct class_device *dev, char *buf) \ | |
568 | { \ | |
569 | struct input_dev *input_dev = to_input_dev(dev); \ | |
570 | int retval; \ | |
571 | \ | |
e676c232 | 572 | retval = mutex_lock_interruptible(&input_dev->mutex); \ |
5c1e9a6a DT |
573 | if (retval) \ |
574 | return retval; \ | |
575 | \ | |
2db66876 DT |
576 | retval = scnprintf(buf, PAGE_SIZE, \ |
577 | "%s\n", input_dev->name ? input_dev->name : ""); \ | |
5c1e9a6a | 578 | \ |
e676c232 | 579 | mutex_unlock(&input_dev->mutex); \ |
5c1e9a6a DT |
580 | \ |
581 | return retval; \ | |
629b77a4 GKH |
582 | } \ |
583 | static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL); | |
5c1e9a6a DT |
584 | |
585 | INPUT_DEV_STRING_ATTR_SHOW(name); | |
586 | INPUT_DEV_STRING_ATTR_SHOW(phys); | |
587 | INPUT_DEV_STRING_ATTR_SHOW(uniq); | |
588 | ||
ac648a6a DT |
589 | static int input_print_modalias_bits(char *buf, int size, |
590 | char name, unsigned long *bm, | |
591 | unsigned int min_bit, unsigned int max_bit) | |
1d8f430c | 592 | { |
ac648a6a | 593 | int len = 0, i; |
1d8f430c | 594 | |
ac648a6a DT |
595 | len += snprintf(buf, max(size, 0), "%c", name); |
596 | for (i = min_bit; i < max_bit; i++) | |
597 | if (bm[LONG(i)] & BIT(i)) | |
598 | len += snprintf(buf + len, max(size - len, 0), "%X,", i); | |
1d8f430c RR |
599 | return len; |
600 | } | |
601 | ||
2db66876 DT |
602 | static int input_print_modalias(char *buf, int size, struct input_dev *id, |
603 | int add_cr) | |
1d8f430c | 604 | { |
bd37e5a9 | 605 | int len; |
1d8f430c | 606 | |
ac648a6a DT |
607 | len = snprintf(buf, max(size, 0), |
608 | "input:b%04Xv%04Xp%04Xe%04X-", | |
609 | id->id.bustype, id->id.vendor, | |
610 | id->id.product, id->id.version); | |
611 | ||
612 | len += input_print_modalias_bits(buf + len, size - len, | |
613 | 'e', id->evbit, 0, EV_MAX); | |
614 | len += input_print_modalias_bits(buf + len, size - len, | |
615 | 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); | |
616 | len += input_print_modalias_bits(buf + len, size - len, | |
617 | 'r', id->relbit, 0, REL_MAX); | |
618 | len += input_print_modalias_bits(buf + len, size - len, | |
619 | 'a', id->absbit, 0, ABS_MAX); | |
620 | len += input_print_modalias_bits(buf + len, size - len, | |
621 | 'm', id->mscbit, 0, MSC_MAX); | |
622 | len += input_print_modalias_bits(buf + len, size - len, | |
623 | 'l', id->ledbit, 0, LED_MAX); | |
624 | len += input_print_modalias_bits(buf + len, size - len, | |
625 | 's', id->sndbit, 0, SND_MAX); | |
626 | len += input_print_modalias_bits(buf + len, size - len, | |
627 | 'f', id->ffbit, 0, FF_MAX); | |
628 | len += input_print_modalias_bits(buf + len, size - len, | |
629 | 'w', id->swbit, 0, SW_MAX); | |
2db66876 DT |
630 | |
631 | if (add_cr) | |
ac648a6a | 632 | len += snprintf(buf + len, max(size - len, 0), "\n"); |
2db66876 | 633 | |
bd37e5a9 KS |
634 | return len; |
635 | } | |
636 | ||
637 | static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf) | |
638 | { | |
639 | struct input_dev *id = to_input_dev(dev); | |
640 | ssize_t len; | |
641 | ||
2db66876 DT |
642 | len = input_print_modalias(buf, PAGE_SIZE, id, 1); |
643 | ||
8a3cf456 | 644 | return min_t(int, len, PAGE_SIZE); |
1d8f430c RR |
645 | } |
646 | static CLASS_DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); | |
647 | ||
629b77a4 GKH |
648 | static struct attribute *input_dev_attrs[] = { |
649 | &class_device_attr_name.attr, | |
650 | &class_device_attr_phys.attr, | |
651 | &class_device_attr_uniq.attr, | |
1d8f430c | 652 | &class_device_attr_modalias.attr, |
629b77a4 GKH |
653 | NULL |
654 | }; | |
655 | ||
bd0ef235 | 656 | static struct attribute_group input_dev_attr_group = { |
629b77a4 | 657 | .attrs = input_dev_attrs, |
5c1e9a6a DT |
658 | }; |
659 | ||
660 | #define INPUT_DEV_ID_ATTR(name) \ | |
661 | static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf) \ | |
662 | { \ | |
663 | struct input_dev *input_dev = to_input_dev(dev); \ | |
2db66876 | 664 | return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \ |
5c1e9a6a DT |
665 | } \ |
666 | static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL); | |
667 | ||
668 | INPUT_DEV_ID_ATTR(bustype); | |
669 | INPUT_DEV_ID_ATTR(vendor); | |
670 | INPUT_DEV_ID_ATTR(product); | |
671 | INPUT_DEV_ID_ATTR(version); | |
672 | ||
673 | static struct attribute *input_dev_id_attrs[] = { | |
674 | &class_device_attr_bustype.attr, | |
675 | &class_device_attr_vendor.attr, | |
676 | &class_device_attr_product.attr, | |
677 | &class_device_attr_version.attr, | |
678 | NULL | |
679 | }; | |
680 | ||
681 | static struct attribute_group input_dev_id_attr_group = { | |
682 | .name = "id", | |
683 | .attrs = input_dev_id_attrs, | |
684 | }; | |
685 | ||
969b21cd DT |
686 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
687 | int max, int add_cr) | |
688 | { | |
689 | int i; | |
690 | int len = 0; | |
691 | ||
692 | for (i = NBITS(max) - 1; i > 0; i--) | |
693 | if (bitmap[i]) | |
694 | break; | |
695 | ||
696 | for (; i >= 0; i--) | |
697 | len += snprintf(buf + len, max(buf_size - len, 0), | |
698 | "%lx%s", bitmap[i], i > 0 ? " " : ""); | |
699 | ||
700 | if (add_cr) | |
701 | len += snprintf(buf + len, max(buf_size - len, 0), "\n"); | |
702 | ||
703 | return len; | |
704 | } | |
705 | ||
5c1e9a6a DT |
706 | #define INPUT_DEV_CAP_ATTR(ev, bm) \ |
707 | static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf) \ | |
708 | { \ | |
709 | struct input_dev *input_dev = to_input_dev(dev); \ | |
2db66876 DT |
710 | int len = input_print_bitmap(buf, PAGE_SIZE, \ |
711 | input_dev->bm##bit, ev##_MAX, 1); \ | |
712 | return min_t(int, len, PAGE_SIZE); \ | |
5c1e9a6a DT |
713 | } \ |
714 | static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL); | |
715 | ||
716 | INPUT_DEV_CAP_ATTR(EV, ev); | |
717 | INPUT_DEV_CAP_ATTR(KEY, key); | |
718 | INPUT_DEV_CAP_ATTR(REL, rel); | |
719 | INPUT_DEV_CAP_ATTR(ABS, abs); | |
720 | INPUT_DEV_CAP_ATTR(MSC, msc); | |
721 | INPUT_DEV_CAP_ATTR(LED, led); | |
722 | INPUT_DEV_CAP_ATTR(SND, snd); | |
723 | INPUT_DEV_CAP_ATTR(FF, ff); | |
724 | INPUT_DEV_CAP_ATTR(SW, sw); | |
725 | ||
726 | static struct attribute *input_dev_caps_attrs[] = { | |
727 | &class_device_attr_ev.attr, | |
728 | &class_device_attr_key.attr, | |
729 | &class_device_attr_rel.attr, | |
730 | &class_device_attr_abs.attr, | |
731 | &class_device_attr_msc.attr, | |
732 | &class_device_attr_led.attr, | |
733 | &class_device_attr_snd.attr, | |
734 | &class_device_attr_ff.attr, | |
735 | &class_device_attr_sw.attr, | |
736 | NULL | |
737 | }; | |
738 | ||
739 | static struct attribute_group input_dev_caps_attr_group = { | |
740 | .name = "capabilities", | |
741 | .attrs = input_dev_caps_attrs, | |
742 | }; | |
743 | ||
d19fbe8a DT |
744 | static void input_dev_release(struct class_device *class_dev) |
745 | { | |
746 | struct input_dev *dev = to_input_dev(class_dev); | |
747 | ||
748 | kfree(dev); | |
749 | module_put(THIS_MODULE); | |
750 | } | |
751 | ||
a7fadbe1 | 752 | /* |
312c004d | 753 | * Input uevent interface - loading event handlers based on |
a7fadbe1 DT |
754 | * device bitfields. |
755 | */ | |
312c004d | 756 | static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index, |
ac648a6a DT |
757 | char *buffer, int buffer_size, int *cur_len, |
758 | const char *name, unsigned long *bitmap, int max) | |
a7fadbe1 DT |
759 | { |
760 | if (*cur_index >= num_envp - 1) | |
761 | return -ENOMEM; | |
762 | ||
763 | envp[*cur_index] = buffer + *cur_len; | |
764 | ||
765 | *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name); | |
ac648a6a | 766 | if (*cur_len >= buffer_size) |
a7fadbe1 DT |
767 | return -ENOMEM; |
768 | ||
769 | *cur_len += input_print_bitmap(buffer + *cur_len, | |
770 | max(buffer_size - *cur_len, 0), | |
2db66876 | 771 | bitmap, max, 0) + 1; |
a7fadbe1 DT |
772 | if (*cur_len > buffer_size) |
773 | return -ENOMEM; | |
774 | ||
775 | (*cur_index)++; | |
776 | return 0; | |
777 | } | |
778 | ||
ac648a6a DT |
779 | static int input_add_uevent_modalias_var(char **envp, int num_envp, int *cur_index, |
780 | char *buffer, int buffer_size, int *cur_len, | |
781 | struct input_dev *dev) | |
782 | { | |
783 | if (*cur_index >= num_envp - 1) | |
784 | return -ENOMEM; | |
785 | ||
786 | envp[*cur_index] = buffer + *cur_len; | |
787 | ||
788 | *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), | |
789 | "MODALIAS="); | |
790 | if (*cur_len >= buffer_size) | |
791 | return -ENOMEM; | |
792 | ||
793 | *cur_len += input_print_modalias(buffer + *cur_len, | |
794 | max(buffer_size - *cur_len, 0), | |
795 | dev, 0) + 1; | |
796 | if (*cur_len > buffer_size) | |
797 | return -ENOMEM; | |
798 | ||
799 | (*cur_index)++; | |
800 | return 0; | |
801 | } | |
802 | ||
a7fadbe1 DT |
803 | #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \ |
804 | do { \ | |
ac648a6a | 805 | int err = add_uevent_var(envp, num_envp, &i, \ |
a7fadbe1 DT |
806 | buffer, buffer_size, &len, \ |
807 | fmt, val); \ | |
808 | if (err) \ | |
809 | return err; \ | |
810 | } while (0) | |
811 | ||
812 | #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \ | |
813 | do { \ | |
312c004d | 814 | int err = input_add_uevent_bm_var(envp, num_envp, &i, \ |
a7fadbe1 DT |
815 | buffer, buffer_size, &len, \ |
816 | name, bm, max); \ | |
817 | if (err) \ | |
818 | return err; \ | |
819 | } while (0) | |
820 | ||
ac648a6a DT |
821 | #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \ |
822 | do { \ | |
823 | int err = input_add_uevent_modalias_var(envp, \ | |
824 | num_envp, &i, \ | |
825 | buffer, buffer_size, &len, \ | |
826 | dev); \ | |
827 | if (err) \ | |
828 | return err; \ | |
829 | } while (0) | |
830 | ||
312c004d KS |
831 | static int input_dev_uevent(struct class_device *cdev, char **envp, |
832 | int num_envp, char *buffer, int buffer_size) | |
a7fadbe1 DT |
833 | { |
834 | struct input_dev *dev = to_input_dev(cdev); | |
835 | int i = 0; | |
836 | int len = 0; | |
837 | ||
838 | INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x", | |
839 | dev->id.bustype, dev->id.vendor, | |
840 | dev->id.product, dev->id.version); | |
841 | if (dev->name) | |
842 | INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); | |
843 | if (dev->phys) | |
844 | INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); | |
08de1f04 | 845 | if (dev->uniq) |
a7fadbe1 DT |
846 | INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); |
847 | ||
848 | INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX); | |
849 | if (test_bit(EV_KEY, dev->evbit)) | |
850 | INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX); | |
851 | if (test_bit(EV_REL, dev->evbit)) | |
852 | INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX); | |
853 | if (test_bit(EV_ABS, dev->evbit)) | |
854 | INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX); | |
855 | if (test_bit(EV_MSC, dev->evbit)) | |
856 | INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX); | |
857 | if (test_bit(EV_LED, dev->evbit)) | |
858 | INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX); | |
859 | if (test_bit(EV_SND, dev->evbit)) | |
860 | INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX); | |
861 | if (test_bit(EV_FF, dev->evbit)) | |
862 | INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX); | |
863 | if (test_bit(EV_SW, dev->evbit)) | |
864 | INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); | |
865 | ||
ac648a6a | 866 | INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); |
a7fadbe1 | 867 | |
bd37e5a9 | 868 | envp[i] = NULL; |
a7fadbe1 DT |
869 | return 0; |
870 | } | |
871 | ||
ea9f240b GKH |
872 | struct class input_class = { |
873 | .name = "input", | |
d19fbe8a | 874 | .release = input_dev_release, |
312c004d | 875 | .uevent = input_dev_uevent, |
d19fbe8a DT |
876 | }; |
877 | ||
878 | struct input_dev *input_allocate_device(void) | |
879 | { | |
880 | struct input_dev *dev; | |
881 | ||
882 | dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); | |
883 | if (dev) { | |
884 | dev->dynalloc = 1; | |
ea9f240b | 885 | dev->cdev.class = &input_class; |
d19fbe8a | 886 | class_device_initialize(&dev->cdev); |
f60d2b11 | 887 | mutex_init(&dev->mutex); |
d19fbe8a DT |
888 | INIT_LIST_HEAD(&dev->h_list); |
889 | INIT_LIST_HEAD(&dev->node); | |
890 | } | |
891 | ||
892 | return dev; | |
893 | } | |
894 | ||
f60d2b11 DT |
895 | void input_free_device(struct input_dev *dev) |
896 | { | |
897 | if (dev) { | |
898 | ||
899 | mutex_lock(&dev->mutex); | |
900 | dev->name = dev->phys = dev->uniq = NULL; | |
901 | mutex_unlock(&dev->mutex); | |
902 | ||
903 | input_put_device(dev); | |
904 | } | |
905 | } | |
906 | ||
5f945489 | 907 | int input_register_device(struct input_dev *dev) |
1da177e4 | 908 | { |
bd0ef235 | 909 | static atomic_t input_no = ATOMIC_INIT(0); |
1da177e4 LT |
910 | struct input_handle *handle; |
911 | struct input_handler *handler; | |
912 | struct input_device_id *id; | |
bd0ef235 DT |
913 | const char *path; |
914 | int error; | |
1da177e4 | 915 | |
5f945489 DT |
916 | if (!dev->dynalloc) { |
917 | printk(KERN_WARNING "input: device %s is statically allocated, will not register\n" | |
918 | "Please convert to input_allocate_device() or contact dtor_core@ameritech.net\n", | |
919 | dev->name ? dev->name : "<Unknown>"); | |
920 | return -EINVAL; | |
921 | } | |
1da177e4 | 922 | |
5f945489 | 923 | set_bit(EV_SYN, dev->evbit); |
0fbf87ca | 924 | |
1da177e4 LT |
925 | /* |
926 | * If delay and period are pre-set by the driver, then autorepeating | |
927 | * is handled by the driver itself and we don't do it in input.c. | |
928 | */ | |
929 | ||
930 | init_timer(&dev->timer); | |
931 | if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { | |
932 | dev->timer.data = (long) dev; | |
933 | dev->timer.function = input_repeat_key; | |
934 | dev->rep[REP_DELAY] = 250; | |
935 | dev->rep[REP_PERIOD] = 33; | |
936 | } | |
937 | ||
938 | INIT_LIST_HEAD(&dev->h_list); | |
939 | list_add_tail(&dev->node, &input_dev_list); | |
940 | ||
bd0ef235 DT |
941 | dev->cdev.class = &input_class; |
942 | snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id), | |
943 | "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1); | |
944 | ||
945 | error = class_device_add(&dev->cdev); | |
946 | if (error) | |
947 | return error; | |
948 | ||
949 | error = sysfs_create_group(&dev->cdev.kobj, &input_dev_attr_group); | |
950 | if (error) | |
951 | goto fail1; | |
952 | ||
953 | error = sysfs_create_group(&dev->cdev.kobj, &input_dev_id_attr_group); | |
954 | if (error) | |
955 | goto fail2; | |
956 | ||
957 | error = sysfs_create_group(&dev->cdev.kobj, &input_dev_caps_attr_group); | |
958 | if (error) | |
959 | goto fail3; | |
960 | ||
961 | __module_get(THIS_MODULE); | |
962 | ||
963 | path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL); | |
964 | printk(KERN_INFO "input: %s as %s\n", | |
965 | dev->name ? dev->name : "Unspecified device", path ? path : "N/A"); | |
966 | kfree(path); | |
10204020 | 967 | |
1da177e4 LT |
968 | list_for_each_entry(handler, &input_handler_list, node) |
969 | if (!handler->blacklist || !input_match_device(handler->blacklist, dev)) | |
970 | if ((id = input_match_device(handler->id_table, dev))) | |
971 | if ((handle = handler->connect(handler, dev, id))) | |
972 | input_link_handle(handle); | |
973 | ||
f96b434d | 974 | input_wakeup_procfs_readers(); |
5f945489 DT |
975 | |
976 | return 0; | |
bd0ef235 DT |
977 | |
978 | fail3: sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group); | |
979 | fail2: sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group); | |
980 | fail1: class_device_del(&dev->cdev); | |
981 | return error; | |
1da177e4 LT |
982 | } |
983 | ||
984 | void input_unregister_device(struct input_dev *dev) | |
985 | { | |
1e0afb28 | 986 | struct list_head *node, *next; |
1da177e4 | 987 | |
1e0afb28 DT |
988 | if (!dev) |
989 | return; | |
1da177e4 LT |
990 | |
991 | del_timer_sync(&dev->timer); | |
992 | ||
993 | list_for_each_safe(node, next, &dev->h_list) { | |
994 | struct input_handle * handle = to_handle(node); | |
995 | list_del_init(&handle->d_node); | |
996 | list_del_init(&handle->h_node); | |
997 | handle->handler->disconnect(handle); | |
998 | } | |
999 | ||
1da177e4 LT |
1000 | list_del_init(&dev->node); |
1001 | ||
5f945489 DT |
1002 | sysfs_remove_group(&dev->cdev.kobj, &input_dev_caps_attr_group); |
1003 | sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group); | |
bd0ef235 | 1004 | sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group); |
5f945489 | 1005 | class_device_unregister(&dev->cdev); |
d19fbe8a | 1006 | |
f60d2b11 DT |
1007 | mutex_lock(&dev->mutex); |
1008 | dev->name = dev->phys = dev->uniq = NULL; | |
1009 | mutex_unlock(&dev->mutex); | |
1010 | ||
f96b434d | 1011 | input_wakeup_procfs_readers(); |
1da177e4 LT |
1012 | } |
1013 | ||
1014 | void input_register_handler(struct input_handler *handler) | |
1015 | { | |
1016 | struct input_dev *dev; | |
1017 | struct input_handle *handle; | |
1018 | struct input_device_id *id; | |
1019 | ||
1e0afb28 DT |
1020 | if (!handler) |
1021 | return; | |
1da177e4 LT |
1022 | |
1023 | INIT_LIST_HEAD(&handler->h_list); | |
1024 | ||
1025 | if (handler->fops != NULL) | |
1026 | input_table[handler->minor >> 5] = handler; | |
1027 | ||
1028 | list_add_tail(&handler->node, &input_handler_list); | |
1029 | ||
1030 | list_for_each_entry(dev, &input_dev_list, node) | |
1031 | if (!handler->blacklist || !input_match_device(handler->blacklist, dev)) | |
1032 | if ((id = input_match_device(handler->id_table, dev))) | |
1033 | if ((handle = handler->connect(handler, dev, id))) | |
1034 | input_link_handle(handle); | |
1035 | ||
f96b434d | 1036 | input_wakeup_procfs_readers(); |
1da177e4 LT |
1037 | } |
1038 | ||
1039 | void input_unregister_handler(struct input_handler *handler) | |
1040 | { | |
1e0afb28 | 1041 | struct list_head *node, *next; |
1da177e4 LT |
1042 | |
1043 | list_for_each_safe(node, next, &handler->h_list) { | |
1044 | struct input_handle * handle = to_handle_h(node); | |
1045 | list_del_init(&handle->h_node); | |
1046 | list_del_init(&handle->d_node); | |
1047 | handler->disconnect(handle); | |
1048 | } | |
1049 | ||
1050 | list_del_init(&handler->node); | |
1051 | ||
1052 | if (handler->fops != NULL) | |
1053 | input_table[handler->minor >> 5] = NULL; | |
1054 | ||
f96b434d | 1055 | input_wakeup_procfs_readers(); |
1da177e4 LT |
1056 | } |
1057 | ||
1058 | static int input_open_file(struct inode *inode, struct file *file) | |
1059 | { | |
1060 | struct input_handler *handler = input_table[iminor(inode) >> 5]; | |
99ac48f5 | 1061 | const struct file_operations *old_fops, *new_fops = NULL; |
1da177e4 LT |
1062 | int err; |
1063 | ||
1064 | /* No load-on-demand here? */ | |
1065 | if (!handler || !(new_fops = fops_get(handler->fops))) | |
1066 | return -ENODEV; | |
1067 | ||
1068 | /* | |
1069 | * That's _really_ odd. Usually NULL ->open means "nothing special", | |
1070 | * not "no device". Oh, well... | |
1071 | */ | |
1072 | if (!new_fops->open) { | |
1073 | fops_put(new_fops); | |
1074 | return -ENODEV; | |
1075 | } | |
1076 | old_fops = file->f_op; | |
1077 | file->f_op = new_fops; | |
1078 | ||
1079 | err = new_fops->open(inode, file); | |
1080 | ||
1081 | if (err) { | |
1082 | fops_put(file->f_op); | |
1083 | file->f_op = fops_get(old_fops); | |
1084 | } | |
1085 | fops_put(old_fops); | |
1086 | return err; | |
1087 | } | |
1088 | ||
1089 | static struct file_operations input_fops = { | |
1090 | .owner = THIS_MODULE, | |
1091 | .open = input_open_file, | |
1092 | }; | |
1093 | ||
f96b434d | 1094 | static int __init input_init(void) |
1da177e4 | 1095 | { |
f96b434d | 1096 | int err; |
1da177e4 | 1097 | |
ea9f240b | 1098 | err = class_register(&input_class); |
d19fbe8a DT |
1099 | if (err) { |
1100 | printk(KERN_ERR "input: unable to register input_dev class\n"); | |
1101 | return err; | |
1102 | } | |
1103 | ||
f96b434d DT |
1104 | err = input_proc_init(); |
1105 | if (err) | |
b0fdfebb | 1106 | goto fail1; |
1da177e4 | 1107 | |
f96b434d DT |
1108 | err = register_chrdev(INPUT_MAJOR, "input", &input_fops); |
1109 | if (err) { | |
1110 | printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR); | |
b0fdfebb | 1111 | goto fail2; |
1da177e4 | 1112 | } |
e334016f | 1113 | |
1da177e4 | 1114 | return 0; |
1da177e4 | 1115 | |
b0fdfebb | 1116 | fail2: input_proc_exit(); |
ea9f240b | 1117 | fail1: class_unregister(&input_class); |
f96b434d | 1118 | return err; |
1da177e4 LT |
1119 | } |
1120 | ||
1121 | static void __exit input_exit(void) | |
1122 | { | |
f96b434d | 1123 | input_proc_exit(); |
1da177e4 | 1124 | unregister_chrdev(INPUT_MAJOR, "input"); |
ea9f240b | 1125 | class_unregister(&input_class); |
1da177e4 LT |
1126 | } |
1127 | ||
1128 | subsys_initcall(input_init); | |
1129 | module_exit(input_exit); |