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