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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> | |
21 | #include <linux/kobject_uevent.h> | |
22 | #include <linux/interrupt.h> | |
23 | #include <linux/poll.h> | |
24 | #include <linux/device.h> | |
1da177e4 LT |
25 | |
26 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>"); | |
27 | MODULE_DESCRIPTION("Input core"); | |
28 | MODULE_LICENSE("GPL"); | |
29 | ||
d19fbe8a | 30 | EXPORT_SYMBOL(input_allocate_device); |
1da177e4 LT |
31 | EXPORT_SYMBOL(input_register_device); |
32 | EXPORT_SYMBOL(input_unregister_device); | |
33 | EXPORT_SYMBOL(input_register_handler); | |
34 | EXPORT_SYMBOL(input_unregister_handler); | |
35 | EXPORT_SYMBOL(input_grab_device); | |
36 | EXPORT_SYMBOL(input_release_device); | |
37 | EXPORT_SYMBOL(input_open_device); | |
38 | EXPORT_SYMBOL(input_close_device); | |
39 | EXPORT_SYMBOL(input_accept_process); | |
40 | EXPORT_SYMBOL(input_flush_device); | |
41 | EXPORT_SYMBOL(input_event); | |
42 | EXPORT_SYMBOL(input_class); | |
43 | ||
44 | #define INPUT_DEVICES 256 | |
45 | ||
46 | static LIST_HEAD(input_dev_list); | |
47 | static LIST_HEAD(input_handler_list); | |
48 | ||
49 | static struct input_handler *input_table[8]; | |
50 | ||
1da177e4 LT |
51 | void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) |
52 | { | |
53 | struct input_handle *handle; | |
54 | ||
55 | if (type > EV_MAX || !test_bit(type, dev->evbit)) | |
56 | return; | |
57 | ||
58 | add_input_randomness(type, code, value); | |
59 | ||
60 | switch (type) { | |
61 | ||
62 | case EV_SYN: | |
63 | switch (code) { | |
64 | case SYN_CONFIG: | |
65 | if (dev->event) dev->event(dev, type, code, value); | |
66 | break; | |
67 | ||
68 | case SYN_REPORT: | |
69 | if (dev->sync) return; | |
70 | dev->sync = 1; | |
71 | break; | |
72 | } | |
73 | break; | |
74 | ||
75 | case EV_KEY: | |
76 | ||
77 | if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value) | |
78 | return; | |
79 | ||
80 | if (value == 2) | |
81 | break; | |
82 | ||
83 | change_bit(code, dev->key); | |
84 | ||
85 | if (test_bit(EV_REP, dev->evbit) && dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && dev->timer.data && value) { | |
86 | dev->repeat_key = code; | |
87 | mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_DELAY])); | |
88 | } | |
89 | ||
90 | break; | |
91 | ||
31581066 RP |
92 | case EV_SW: |
93 | ||
94 | if (code > SW_MAX || !test_bit(code, dev->swbit) || !!test_bit(code, dev->sw) == value) | |
95 | return; | |
96 | ||
97 | change_bit(code, dev->sw); | |
98 | ||
99 | break; | |
100 | ||
1da177e4 LT |
101 | case EV_ABS: |
102 | ||
103 | if (code > ABS_MAX || !test_bit(code, dev->absbit)) | |
104 | return; | |
105 | ||
106 | if (dev->absfuzz[code]) { | |
107 | if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) && | |
108 | (value < dev->abs[code] + (dev->absfuzz[code] >> 1))) | |
109 | return; | |
110 | ||
111 | if ((value > dev->abs[code] - dev->absfuzz[code]) && | |
112 | (value < dev->abs[code] + dev->absfuzz[code])) | |
113 | value = (dev->abs[code] * 3 + value) >> 2; | |
114 | ||
115 | if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) && | |
116 | (value < dev->abs[code] + (dev->absfuzz[code] << 1))) | |
117 | value = (dev->abs[code] + value) >> 1; | |
118 | } | |
119 | ||
120 | if (dev->abs[code] == value) | |
121 | return; | |
122 | ||
123 | dev->abs[code] = value; | |
124 | break; | |
125 | ||
126 | case EV_REL: | |
127 | ||
128 | if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0)) | |
129 | return; | |
130 | ||
131 | break; | |
132 | ||
133 | case EV_MSC: | |
134 | ||
135 | if (code > MSC_MAX || !test_bit(code, dev->mscbit)) | |
136 | return; | |
137 | ||
138 | if (dev->event) dev->event(dev, type, code, value); | |
139 | ||
140 | break; | |
141 | ||
142 | case EV_LED: | |
143 | ||
144 | if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value) | |
145 | return; | |
146 | ||
147 | change_bit(code, dev->led); | |
148 | if (dev->event) dev->event(dev, type, code, value); | |
149 | ||
150 | break; | |
151 | ||
152 | case EV_SND: | |
153 | ||
154 | if (code > SND_MAX || !test_bit(code, dev->sndbit)) | |
155 | return; | |
156 | ||
157 | if (dev->event) dev->event(dev, type, code, value); | |
158 | ||
159 | break; | |
160 | ||
161 | case EV_REP: | |
162 | ||
163 | if (code > REP_MAX || value < 0 || dev->rep[code] == value) return; | |
164 | ||
165 | dev->rep[code] = value; | |
166 | if (dev->event) dev->event(dev, type, code, value); | |
167 | ||
168 | break; | |
169 | ||
170 | case EV_FF: | |
171 | if (dev->event) dev->event(dev, type, code, value); | |
172 | break; | |
173 | } | |
174 | ||
175 | if (type != EV_SYN) | |
176 | dev->sync = 0; | |
177 | ||
178 | if (dev->grab) | |
179 | dev->grab->handler->event(dev->grab, type, code, value); | |
180 | else | |
181 | list_for_each_entry(handle, &dev->h_list, d_node) | |
182 | if (handle->open) | |
183 | handle->handler->event(handle, type, code, value); | |
184 | } | |
185 | ||
186 | static void input_repeat_key(unsigned long data) | |
187 | { | |
188 | struct input_dev *dev = (void *) data; | |
189 | ||
190 | if (!test_bit(dev->repeat_key, dev->key)) | |
191 | return; | |
192 | ||
193 | input_event(dev, EV_KEY, dev->repeat_key, 2); | |
194 | input_sync(dev); | |
195 | ||
196 | if (dev->rep[REP_PERIOD]) | |
197 | mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD])); | |
198 | } | |
199 | ||
200 | int input_accept_process(struct input_handle *handle, struct file *file) | |
201 | { | |
202 | if (handle->dev->accept) | |
203 | return handle->dev->accept(handle->dev, file); | |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
208 | int input_grab_device(struct input_handle *handle) | |
209 | { | |
210 | if (handle->dev->grab) | |
211 | return -EBUSY; | |
212 | ||
213 | handle->dev->grab = handle; | |
214 | return 0; | |
215 | } | |
216 | ||
217 | void input_release_device(struct input_handle *handle) | |
218 | { | |
219 | if (handle->dev->grab == handle) | |
220 | handle->dev->grab = NULL; | |
221 | } | |
222 | ||
223 | int input_open_device(struct input_handle *handle) | |
224 | { | |
0fbf87ca DT |
225 | struct input_dev *dev = handle->dev; |
226 | int err; | |
227 | ||
228 | err = down_interruptible(&dev->sem); | |
229 | if (err) | |
230 | return err; | |
231 | ||
1da177e4 | 232 | handle->open++; |
0fbf87ca DT |
233 | |
234 | if (!dev->users++ && dev->open) | |
235 | err = dev->open(dev); | |
236 | ||
237 | if (err) | |
238 | handle->open--; | |
239 | ||
240 | up(&dev->sem); | |
241 | ||
242 | return err; | |
1da177e4 LT |
243 | } |
244 | ||
245 | int input_flush_device(struct input_handle* handle, struct file* file) | |
246 | { | |
247 | if (handle->dev->flush) | |
248 | return handle->dev->flush(handle->dev, file); | |
249 | ||
250 | return 0; | |
251 | } | |
252 | ||
253 | void input_close_device(struct input_handle *handle) | |
254 | { | |
0fbf87ca DT |
255 | struct input_dev *dev = handle->dev; |
256 | ||
1da177e4 | 257 | input_release_device(handle); |
0fbf87ca DT |
258 | |
259 | down(&dev->sem); | |
260 | ||
261 | if (!--dev->users && dev->close) | |
262 | dev->close(dev); | |
1da177e4 | 263 | handle->open--; |
0fbf87ca DT |
264 | |
265 | up(&dev->sem); | |
1da177e4 LT |
266 | } |
267 | ||
268 | static void input_link_handle(struct input_handle *handle) | |
269 | { | |
270 | list_add_tail(&handle->d_node, &handle->dev->h_list); | |
271 | list_add_tail(&handle->h_node, &handle->handler->h_list); | |
272 | } | |
273 | ||
274 | #define MATCH_BIT(bit, max) \ | |
275 | for (i = 0; i < NBITS(max); i++) \ | |
276 | if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \ | |
277 | break; \ | |
278 | if (i != NBITS(max)) \ | |
279 | continue; | |
280 | ||
281 | static struct input_device_id *input_match_device(struct input_device_id *id, struct input_dev *dev) | |
282 | { | |
283 | int i; | |
284 | ||
285 | for (; id->flags || id->driver_info; id++) { | |
286 | ||
287 | if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) | |
288 | if (id->id.bustype != dev->id.bustype) | |
289 | continue; | |
290 | ||
291 | if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) | |
292 | if (id->id.vendor != dev->id.vendor) | |
293 | continue; | |
294 | ||
295 | if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) | |
296 | if (id->id.product != dev->id.product) | |
297 | continue; | |
298 | ||
299 | if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) | |
300 | if (id->id.version != dev->id.version) | |
301 | continue; | |
302 | ||
303 | MATCH_BIT(evbit, EV_MAX); | |
304 | MATCH_BIT(keybit, KEY_MAX); | |
305 | MATCH_BIT(relbit, REL_MAX); | |
306 | MATCH_BIT(absbit, ABS_MAX); | |
307 | MATCH_BIT(mscbit, MSC_MAX); | |
308 | MATCH_BIT(ledbit, LED_MAX); | |
309 | MATCH_BIT(sndbit, SND_MAX); | |
310 | MATCH_BIT(ffbit, FF_MAX); | |
ff13f98b | 311 | MATCH_BIT(swbit, SW_MAX); |
1da177e4 LT |
312 | |
313 | return id; | |
314 | } | |
315 | ||
316 | return NULL; | |
317 | } | |
318 | ||
f96b434d | 319 | |
1da177e4 LT |
320 | /* |
321 | * Input hotplugging interface - loading event handlers based on | |
322 | * device bitfields. | |
323 | */ | |
324 | ||
325 | #ifdef CONFIG_HOTPLUG | |
326 | ||
327 | /* | |
328 | * Input hotplugging invokes what /proc/sys/kernel/hotplug says | |
329 | * (normally /sbin/hotplug) when input devices get added or removed. | |
330 | * | |
331 | * This invokes a user mode policy agent, typically helping to load driver | |
332 | * or other modules, configure the device, and more. Drivers can provide | |
333 | * a MODULE_DEVICE_TABLE to help with module loading subtasks. | |
334 | * | |
335 | */ | |
336 | ||
337 | #define SPRINTF_BIT_A(bit, name, max) \ | |
338 | do { \ | |
339 | envp[i++] = scratch; \ | |
340 | scratch += sprintf(scratch, name); \ | |
341 | for (j = NBITS(max) - 1; j >= 0; j--) \ | |
342 | if (dev->bit[j]) break; \ | |
343 | for (; j >= 0; j--) \ | |
344 | scratch += sprintf(scratch, "%lx ", dev->bit[j]); \ | |
345 | scratch++; \ | |
346 | } while (0) | |
347 | ||
348 | #define SPRINTF_BIT_A2(bit, name, max, ev) \ | |
349 | do { \ | |
350 | if (test_bit(ev, dev->evbit)) \ | |
351 | SPRINTF_BIT_A(bit, name, max); \ | |
352 | } while (0) | |
353 | ||
354 | static void input_call_hotplug(char *verb, struct input_dev *dev) | |
355 | { | |
356 | char *argv[3], **envp, *buf, *scratch; | |
357 | int i = 0, j, value; | |
358 | ||
359 | if (!hotplug_path[0]) { | |
360 | printk(KERN_ERR "input.c: calling hotplug without a hotplug agent defined\n"); | |
361 | return; | |
362 | } | |
363 | if (in_interrupt()) { | |
364 | printk(KERN_ERR "input.c: calling hotplug from interrupt\n"); | |
365 | return; | |
366 | } | |
367 | if (!current->fs->root) { | |
368 | printk(KERN_WARNING "input.c: calling hotplug without valid filesystem\n"); | |
369 | return; | |
370 | } | |
371 | if (!(envp = (char **) kmalloc(20 * sizeof(char *), GFP_KERNEL))) { | |
372 | printk(KERN_ERR "input.c: not enough memory allocating hotplug environment\n"); | |
373 | return; | |
374 | } | |
375 | if (!(buf = kmalloc(1024, GFP_KERNEL))) { | |
376 | kfree (envp); | |
377 | printk(KERN_ERR "input.c: not enough memory allocating hotplug environment\n"); | |
378 | return; | |
379 | } | |
380 | ||
381 | argv[0] = hotplug_path; | |
382 | argv[1] = "input"; | |
383 | argv[2] = NULL; | |
384 | ||
385 | envp[i++] = "HOME=/"; | |
386 | envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; | |
387 | ||
388 | scratch = buf; | |
389 | ||
390 | envp[i++] = scratch; | |
391 | scratch += sprintf(scratch, "ACTION=%s", verb) + 1; | |
392 | ||
393 | envp[i++] = scratch; | |
394 | scratch += sprintf(scratch, "PRODUCT=%x/%x/%x/%x", | |
395 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version) + 1; | |
396 | ||
397 | if (dev->name) { | |
398 | envp[i++] = scratch; | |
399 | scratch += sprintf(scratch, "NAME=%s", dev->name) + 1; | |
400 | } | |
401 | ||
402 | if (dev->phys) { | |
403 | envp[i++] = scratch; | |
404 | scratch += sprintf(scratch, "PHYS=%s", dev->phys) + 1; | |
405 | } | |
406 | ||
407 | SPRINTF_BIT_A(evbit, "EV=", EV_MAX); | |
408 | SPRINTF_BIT_A2(keybit, "KEY=", KEY_MAX, EV_KEY); | |
409 | SPRINTF_BIT_A2(relbit, "REL=", REL_MAX, EV_REL); | |
410 | SPRINTF_BIT_A2(absbit, "ABS=", ABS_MAX, EV_ABS); | |
411 | SPRINTF_BIT_A2(mscbit, "MSC=", MSC_MAX, EV_MSC); | |
412 | SPRINTF_BIT_A2(ledbit, "LED=", LED_MAX, EV_LED); | |
413 | SPRINTF_BIT_A2(sndbit, "SND=", SND_MAX, EV_SND); | |
414 | SPRINTF_BIT_A2(ffbit, "FF=", FF_MAX, EV_FF); | |
31581066 | 415 | SPRINTF_BIT_A2(swbit, "SW=", SW_MAX, EV_SW); |
1da177e4 LT |
416 | |
417 | envp[i++] = NULL; | |
418 | ||
419 | #ifdef INPUT_DEBUG | |
420 | printk(KERN_DEBUG "input.c: calling %s %s [%s %s %s %s %s]\n", | |
421 | argv[0], argv[1], envp[0], envp[1], envp[2], envp[3], envp[4]); | |
422 | #endif | |
423 | ||
424 | value = call_usermodehelper(argv [0], argv, envp, 0); | |
425 | ||
426 | kfree(buf); | |
427 | kfree(envp); | |
428 | ||
429 | #ifdef INPUT_DEBUG | |
430 | if (value != 0) | |
431 | printk(KERN_DEBUG "input.c: hotplug returned %d\n", value); | |
432 | #endif | |
433 | } | |
434 | ||
435 | #endif | |
436 | ||
f96b434d DT |
437 | #ifdef CONFIG_PROC_FS |
438 | ||
439 | static struct proc_dir_entry *proc_bus_input_dir; | |
440 | static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); | |
441 | static int input_devices_state; | |
442 | ||
443 | static inline void input_wakeup_procfs_readers(void) | |
444 | { | |
445 | input_devices_state++; | |
446 | wake_up(&input_devices_poll_wait); | |
447 | } | |
448 | ||
449 | static unsigned int input_devices_poll(struct file *file, poll_table *wait) | |
450 | { | |
451 | int state = input_devices_state; | |
452 | poll_wait(file, &input_devices_poll_wait, wait); | |
453 | if (state != input_devices_state) | |
454 | return POLLIN | POLLRDNORM; | |
455 | return 0; | |
456 | } | |
457 | ||
458 | #define SPRINTF_BIT_B(bit, name, max) \ | |
459 | do { \ | |
460 | len += sprintf(buf + len, "B: %s", name); \ | |
461 | for (i = NBITS(max) - 1; i >= 0; i--) \ | |
462 | if (dev->bit[i]) break; \ | |
463 | for (; i >= 0; i--) \ | |
464 | len += sprintf(buf + len, "%lx ", dev->bit[i]); \ | |
465 | len += sprintf(buf + len, "\n"); \ | |
466 | } while (0) | |
467 | ||
468 | #define SPRINTF_BIT_B2(bit, name, max, ev) \ | |
469 | do { \ | |
470 | if (test_bit(ev, dev->evbit)) \ | |
471 | SPRINTF_BIT_B(bit, name, max); \ | |
472 | } while (0) | |
473 | ||
474 | static int input_devices_read(char *buf, char **start, off_t pos, int count, int *eof, void *data) | |
475 | { | |
476 | struct input_dev *dev; | |
477 | struct input_handle *handle; | |
051b2fea | 478 | const char *path; |
f96b434d DT |
479 | |
480 | off_t at = 0; | |
481 | int i, len, cnt = 0; | |
482 | ||
483 | list_for_each_entry(dev, &input_dev_list, node) { | |
484 | ||
051b2fea DT |
485 | path = dev->dynalloc ? kobject_get_path(&dev->cdev.kobj, GFP_KERNEL) : NULL; |
486 | ||
f96b434d DT |
487 | len = sprintf(buf, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", |
488 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); | |
489 | ||
490 | len += sprintf(buf + len, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); | |
491 | len += sprintf(buf + len, "P: Phys=%s\n", dev->phys ? dev->phys : ""); | |
051b2fea | 492 | len += sprintf(buf + len, "S: Sysfs=%s\n", path ? path : ""); |
f96b434d DT |
493 | len += sprintf(buf + len, "H: Handlers="); |
494 | ||
495 | list_for_each_entry(handle, &dev->h_list, d_node) | |
496 | len += sprintf(buf + len, "%s ", handle->name); | |
497 | ||
498 | len += sprintf(buf + len, "\n"); | |
499 | ||
500 | SPRINTF_BIT_B(evbit, "EV=", EV_MAX); | |
501 | SPRINTF_BIT_B2(keybit, "KEY=", KEY_MAX, EV_KEY); | |
502 | SPRINTF_BIT_B2(relbit, "REL=", REL_MAX, EV_REL); | |
503 | SPRINTF_BIT_B2(absbit, "ABS=", ABS_MAX, EV_ABS); | |
504 | SPRINTF_BIT_B2(mscbit, "MSC=", MSC_MAX, EV_MSC); | |
505 | SPRINTF_BIT_B2(ledbit, "LED=", LED_MAX, EV_LED); | |
506 | SPRINTF_BIT_B2(sndbit, "SND=", SND_MAX, EV_SND); | |
507 | SPRINTF_BIT_B2(ffbit, "FF=", FF_MAX, EV_FF); | |
31581066 | 508 | SPRINTF_BIT_B2(swbit, "SW=", SW_MAX, EV_SW); |
f96b434d DT |
509 | |
510 | len += sprintf(buf + len, "\n"); | |
511 | ||
512 | at += len; | |
513 | ||
514 | if (at >= pos) { | |
515 | if (!*start) { | |
516 | *start = buf + (pos - (at - len)); | |
517 | cnt = at - pos; | |
518 | } else cnt += len; | |
519 | buf += len; | |
520 | if (cnt >= count) | |
521 | break; | |
522 | } | |
051b2fea DT |
523 | |
524 | kfree(path); | |
f96b434d DT |
525 | } |
526 | ||
527 | if (&dev->node == &input_dev_list) | |
528 | *eof = 1; | |
529 | ||
530 | return (count > cnt) ? cnt : count; | |
531 | } | |
532 | ||
533 | static int input_handlers_read(char *buf, char **start, off_t pos, int count, int *eof, void *data) | |
534 | { | |
535 | struct input_handler *handler; | |
536 | ||
537 | off_t at = 0; | |
538 | int len = 0, cnt = 0; | |
539 | int i = 0; | |
540 | ||
541 | list_for_each_entry(handler, &input_handler_list, node) { | |
542 | ||
543 | if (handler->fops) | |
544 | len = sprintf(buf, "N: Number=%d Name=%s Minor=%d\n", | |
545 | i++, handler->name, handler->minor); | |
546 | else | |
547 | len = sprintf(buf, "N: Number=%d Name=%s\n", | |
548 | i++, handler->name); | |
549 | ||
550 | at += len; | |
551 | ||
552 | if (at >= pos) { | |
553 | if (!*start) { | |
554 | *start = buf + (pos - (at - len)); | |
555 | cnt = at - pos; | |
556 | } else cnt += len; | |
557 | buf += len; | |
558 | if (cnt >= count) | |
559 | break; | |
560 | } | |
561 | } | |
562 | if (&handler->node == &input_handler_list) | |
563 | *eof = 1; | |
564 | ||
565 | return (count > cnt) ? cnt : count; | |
566 | } | |
567 | ||
568 | static struct file_operations input_fileops; | |
569 | ||
570 | static int __init input_proc_init(void) | |
571 | { | |
572 | struct proc_dir_entry *entry; | |
573 | ||
574 | proc_bus_input_dir = proc_mkdir("input", proc_bus); | |
575 | if (!proc_bus_input_dir) | |
576 | return -ENOMEM; | |
577 | ||
578 | proc_bus_input_dir->owner = THIS_MODULE; | |
579 | ||
580 | entry = create_proc_read_entry("devices", 0, proc_bus_input_dir, input_devices_read, NULL); | |
581 | if (!entry) | |
582 | goto fail1; | |
583 | ||
584 | entry->owner = THIS_MODULE; | |
585 | input_fileops = *entry->proc_fops; | |
586 | entry->proc_fops = &input_fileops; | |
587 | entry->proc_fops->poll = input_devices_poll; | |
588 | ||
589 | entry = create_proc_read_entry("handlers", 0, proc_bus_input_dir, input_handlers_read, NULL); | |
590 | if (!entry) | |
591 | goto fail2; | |
592 | ||
593 | entry->owner = THIS_MODULE; | |
594 | ||
595 | return 0; | |
596 | ||
597 | fail2: remove_proc_entry("devices", proc_bus_input_dir); | |
598 | fail1: remove_proc_entry("input", proc_bus); | |
599 | return -ENOMEM; | |
600 | } | |
601 | ||
beffbdc2 | 602 | static void input_proc_exit(void) |
f96b434d DT |
603 | { |
604 | remove_proc_entry("devices", proc_bus_input_dir); | |
605 | remove_proc_entry("handlers", proc_bus_input_dir); | |
606 | remove_proc_entry("input", proc_bus); | |
607 | } | |
608 | ||
609 | #else /* !CONFIG_PROC_FS */ | |
610 | static inline void input_wakeup_procfs_readers(void) { } | |
611 | static inline int input_proc_init(void) { return 0; } | |
612 | static inline void input_proc_exit(void) { } | |
613 | #endif | |
614 | ||
d19fbe8a DT |
615 | static void input_dev_release(struct class_device *class_dev) |
616 | { | |
617 | struct input_dev *dev = to_input_dev(class_dev); | |
618 | ||
619 | kfree(dev); | |
620 | module_put(THIS_MODULE); | |
621 | } | |
622 | ||
623 | static struct class input_dev_class = { | |
624 | .name = "input_dev", | |
625 | .release = input_dev_release, | |
626 | }; | |
627 | ||
628 | struct input_dev *input_allocate_device(void) | |
629 | { | |
630 | struct input_dev *dev; | |
631 | ||
632 | dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); | |
633 | if (dev) { | |
634 | dev->dynalloc = 1; | |
635 | dev->cdev.class = &input_dev_class; | |
636 | class_device_initialize(&dev->cdev); | |
637 | INIT_LIST_HEAD(&dev->h_list); | |
638 | INIT_LIST_HEAD(&dev->node); | |
639 | } | |
640 | ||
641 | return dev; | |
642 | } | |
643 | ||
644 | static void input_register_classdevice(struct input_dev *dev) | |
645 | { | |
646 | static atomic_t input_no = ATOMIC_INIT(0); | |
647 | const char *path; | |
648 | ||
649 | __module_get(THIS_MODULE); | |
650 | ||
651 | dev->dev = dev->cdev.dev; | |
652 | ||
653 | snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id), | |
654 | "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1); | |
655 | ||
656 | path = kobject_get_path(&dev->cdev.class->subsys.kset.kobj, GFP_KERNEL); | |
657 | printk(KERN_INFO "input: %s/%s as %s\n", | |
658 | dev->name ? dev->name : "Unspecified device", | |
659 | path ? path : "", dev->cdev.class_id); | |
660 | kfree(path); | |
661 | ||
662 | class_device_add(&dev->cdev); | |
663 | } | |
664 | ||
1da177e4 LT |
665 | void input_register_device(struct input_dev *dev) |
666 | { | |
667 | struct input_handle *handle; | |
668 | struct input_handler *handler; | |
669 | struct input_device_id *id; | |
670 | ||
671 | set_bit(EV_SYN, dev->evbit); | |
672 | ||
0fbf87ca DT |
673 | init_MUTEX(&dev->sem); |
674 | ||
1da177e4 LT |
675 | /* |
676 | * If delay and period are pre-set by the driver, then autorepeating | |
677 | * is handled by the driver itself and we don't do it in input.c. | |
678 | */ | |
679 | ||
680 | init_timer(&dev->timer); | |
681 | if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { | |
682 | dev->timer.data = (long) dev; | |
683 | dev->timer.function = input_repeat_key; | |
684 | dev->rep[REP_DELAY] = 250; | |
685 | dev->rep[REP_PERIOD] = 33; | |
686 | } | |
687 | ||
688 | INIT_LIST_HEAD(&dev->h_list); | |
689 | list_add_tail(&dev->node, &input_dev_list); | |
690 | ||
691 | list_for_each_entry(handler, &input_handler_list, node) | |
692 | if (!handler->blacklist || !input_match_device(handler->blacklist, dev)) | |
693 | if ((id = input_match_device(handler->id_table, dev))) | |
694 | if ((handle = handler->connect(handler, dev, id))) | |
695 | input_link_handle(handle); | |
696 | ||
d19fbe8a DT |
697 | |
698 | if (dev->dynalloc) | |
699 | input_register_classdevice(dev); | |
700 | ||
1da177e4 LT |
701 | #ifdef CONFIG_HOTPLUG |
702 | input_call_hotplug("add", dev); | |
703 | #endif | |
704 | ||
f96b434d | 705 | input_wakeup_procfs_readers(); |
1da177e4 LT |
706 | } |
707 | ||
708 | void input_unregister_device(struct input_dev *dev) | |
709 | { | |
710 | struct list_head * node, * next; | |
711 | ||
712 | if (!dev) return; | |
713 | ||
714 | del_timer_sync(&dev->timer); | |
715 | ||
716 | list_for_each_safe(node, next, &dev->h_list) { | |
717 | struct input_handle * handle = to_handle(node); | |
718 | list_del_init(&handle->d_node); | |
719 | list_del_init(&handle->h_node); | |
720 | handle->handler->disconnect(handle); | |
721 | } | |
722 | ||
723 | #ifdef CONFIG_HOTPLUG | |
724 | input_call_hotplug("remove", dev); | |
725 | #endif | |
726 | ||
727 | list_del_init(&dev->node); | |
728 | ||
d19fbe8a DT |
729 | if (dev->dynalloc) |
730 | class_device_unregister(&dev->cdev); | |
731 | ||
f96b434d | 732 | input_wakeup_procfs_readers(); |
1da177e4 LT |
733 | } |
734 | ||
735 | void input_register_handler(struct input_handler *handler) | |
736 | { | |
737 | struct input_dev *dev; | |
738 | struct input_handle *handle; | |
739 | struct input_device_id *id; | |
740 | ||
741 | if (!handler) return; | |
742 | ||
743 | INIT_LIST_HEAD(&handler->h_list); | |
744 | ||
745 | if (handler->fops != NULL) | |
746 | input_table[handler->minor >> 5] = handler; | |
747 | ||
748 | list_add_tail(&handler->node, &input_handler_list); | |
749 | ||
750 | list_for_each_entry(dev, &input_dev_list, node) | |
751 | if (!handler->blacklist || !input_match_device(handler->blacklist, dev)) | |
752 | if ((id = input_match_device(handler->id_table, dev))) | |
753 | if ((handle = handler->connect(handler, dev, id))) | |
754 | input_link_handle(handle); | |
755 | ||
f96b434d | 756 | input_wakeup_procfs_readers(); |
1da177e4 LT |
757 | } |
758 | ||
759 | void input_unregister_handler(struct input_handler *handler) | |
760 | { | |
761 | struct list_head * node, * next; | |
762 | ||
763 | list_for_each_safe(node, next, &handler->h_list) { | |
764 | struct input_handle * handle = to_handle_h(node); | |
765 | list_del_init(&handle->h_node); | |
766 | list_del_init(&handle->d_node); | |
767 | handler->disconnect(handle); | |
768 | } | |
769 | ||
770 | list_del_init(&handler->node); | |
771 | ||
772 | if (handler->fops != NULL) | |
773 | input_table[handler->minor >> 5] = NULL; | |
774 | ||
f96b434d | 775 | input_wakeup_procfs_readers(); |
1da177e4 LT |
776 | } |
777 | ||
778 | static int input_open_file(struct inode *inode, struct file *file) | |
779 | { | |
780 | struct input_handler *handler = input_table[iminor(inode) >> 5]; | |
781 | struct file_operations *old_fops, *new_fops = NULL; | |
782 | int err; | |
783 | ||
784 | /* No load-on-demand here? */ | |
785 | if (!handler || !(new_fops = fops_get(handler->fops))) | |
786 | return -ENODEV; | |
787 | ||
788 | /* | |
789 | * That's _really_ odd. Usually NULL ->open means "nothing special", | |
790 | * not "no device". Oh, well... | |
791 | */ | |
792 | if (!new_fops->open) { | |
793 | fops_put(new_fops); | |
794 | return -ENODEV; | |
795 | } | |
796 | old_fops = file->f_op; | |
797 | file->f_op = new_fops; | |
798 | ||
799 | err = new_fops->open(inode, file); | |
800 | ||
801 | if (err) { | |
802 | fops_put(file->f_op); | |
803 | file->f_op = fops_get(old_fops); | |
804 | } | |
805 | fops_put(old_fops); | |
806 | return err; | |
807 | } | |
808 | ||
809 | static struct file_operations input_fops = { | |
810 | .owner = THIS_MODULE, | |
811 | .open = input_open_file, | |
812 | }; | |
813 | ||
f96b434d | 814 | struct class *input_class; |
1da177e4 | 815 | |
f96b434d | 816 | static int __init input_init(void) |
1da177e4 | 817 | { |
f96b434d | 818 | int err; |
1da177e4 | 819 | |
d19fbe8a DT |
820 | err = class_register(&input_dev_class); |
821 | if (err) { | |
822 | printk(KERN_ERR "input: unable to register input_dev class\n"); | |
823 | return err; | |
824 | } | |
825 | ||
f96b434d DT |
826 | input_class = class_create(THIS_MODULE, "input"); |
827 | if (IS_ERR(input_class)) { | |
828 | printk(KERN_ERR "input: unable to register input class\n"); | |
d19fbe8a DT |
829 | err = PTR_ERR(input_class); |
830 | goto fail1; | |
1da177e4 LT |
831 | } |
832 | ||
f96b434d DT |
833 | err = input_proc_init(); |
834 | if (err) | |
d19fbe8a | 835 | goto fail2; |
1da177e4 | 836 | |
f96b434d DT |
837 | err = register_chrdev(INPUT_MAJOR, "input", &input_fops); |
838 | if (err) { | |
839 | printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR); | |
d19fbe8a | 840 | goto fail3; |
1da177e4 | 841 | } |
e334016f | 842 | |
1da177e4 | 843 | return 0; |
1da177e4 | 844 | |
d19fbe8a DT |
845 | fail3: input_proc_exit(); |
846 | fail2: class_destroy(input_class); | |
847 | fail1: class_unregister(&input_dev_class); | |
f96b434d | 848 | return err; |
1da177e4 LT |
849 | } |
850 | ||
851 | static void __exit input_exit(void) | |
852 | { | |
f96b434d | 853 | input_proc_exit(); |
1da177e4 | 854 | unregister_chrdev(INPUT_MAJOR, "input"); |
1235686f | 855 | class_destroy(input_class); |
d19fbe8a | 856 | class_unregister(&input_dev_class); |
1da177e4 LT |
857 | } |
858 | ||
859 | subsys_initcall(input_init); | |
860 | module_exit(input_exit); |