Commit | Line | Data |
---|---|---|
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> | |
1da177e4 LT |
14 | #include <linux/input.h> |
15 | #include <linux/module.h> | |
16 | #include <linux/random.h> | |
17 | #include <linux/major.h> | |
18 | #include <linux/proc_fs.h> | |
969b21cd | 19 | #include <linux/seq_file.h> |
1da177e4 LT |
20 | #include <linux/poll.h> |
21 | #include <linux/device.h> | |
e676c232 | 22 | #include <linux/mutex.h> |
8006479c | 23 | #include <linux/rcupdate.h> |
1da177e4 LT |
24 | |
25 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>"); | |
26 | MODULE_DESCRIPTION("Input core"); | |
27 | MODULE_LICENSE("GPL"); | |
28 | ||
1da177e4 LT |
29 | #define INPUT_DEVICES 256 |
30 | ||
31 | static LIST_HEAD(input_dev_list); | |
32 | static LIST_HEAD(input_handler_list); | |
33 | ||
8006479c DT |
34 | /* |
35 | * input_mutex protects access to both input_dev_list and input_handler_list. | |
36 | * This also causes input_[un]register_device and input_[un]register_handler | |
37 | * be mutually exclusive which simplifies locking in drivers implementing | |
38 | * input handlers. | |
39 | */ | |
40 | static DEFINE_MUTEX(input_mutex); | |
41 | ||
1da177e4 LT |
42 | static struct input_handler *input_table[8]; |
43 | ||
8006479c DT |
44 | static inline int is_event_supported(unsigned int code, |
45 | unsigned long *bm, unsigned int max) | |
1da177e4 | 46 | { |
8006479c DT |
47 | return code <= max && test_bit(code, bm); |
48 | } | |
1da177e4 | 49 | |
8006479c DT |
50 | static int input_defuzz_abs_event(int value, int old_val, int fuzz) |
51 | { | |
52 | if (fuzz) { | |
53 | if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2) | |
54 | return old_val; | |
1da177e4 | 55 | |
8006479c DT |
56 | if (value > old_val - fuzz && value < old_val + fuzz) |
57 | return (old_val * 3 + value) / 4; | |
1da177e4 | 58 | |
8006479c DT |
59 | if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2) |
60 | return (old_val + value) / 2; | |
61 | } | |
1da177e4 | 62 | |
8006479c DT |
63 | return value; |
64 | } | |
1da177e4 | 65 | |
8006479c DT |
66 | /* |
67 | * Pass event through all open handles. This function is called with | |
82ba56c2 | 68 | * dev->event_lock held and interrupts disabled. |
8006479c DT |
69 | */ |
70 | static void input_pass_event(struct input_dev *dev, | |
71 | unsigned int type, unsigned int code, int value) | |
72 | { | |
82ba56c2 DT |
73 | struct input_handle *handle; |
74 | ||
75 | rcu_read_lock(); | |
1da177e4 | 76 | |
82ba56c2 | 77 | handle = rcu_dereference(dev->grab); |
8006479c DT |
78 | if (handle) |
79 | handle->handler->event(handle, type, code, value); | |
80 | else | |
81 | list_for_each_entry_rcu(handle, &dev->h_list, d_node) | |
82 | if (handle->open) | |
83 | handle->handler->event(handle, | |
84 | type, code, value); | |
82ba56c2 | 85 | rcu_read_unlock(); |
8006479c | 86 | } |
1da177e4 | 87 | |
8006479c DT |
88 | /* |
89 | * Generate software autorepeat event. Note that we take | |
90 | * dev->event_lock here to avoid racing with input_event | |
91 | * which may cause keys get "stuck". | |
92 | */ | |
93 | static void input_repeat_key(unsigned long data) | |
94 | { | |
95 | struct input_dev *dev = (void *) data; | |
96 | unsigned long flags; | |
1da177e4 | 97 | |
8006479c | 98 | spin_lock_irqsave(&dev->event_lock, flags); |
1da177e4 | 99 | |
8006479c DT |
100 | if (test_bit(dev->repeat_key, dev->key) && |
101 | is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) { | |
1da177e4 | 102 | |
8006479c | 103 | input_pass_event(dev, EV_KEY, dev->repeat_key, 2); |
1da177e4 | 104 | |
8006479c DT |
105 | if (dev->sync) { |
106 | /* | |
107 | * Only send SYN_REPORT if we are not in a middle | |
108 | * of driver parsing a new hardware packet. | |
109 | * Otherwise assume that the driver will send | |
110 | * SYN_REPORT once it's done. | |
111 | */ | |
112 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
113 | } | |
31581066 | 114 | |
8006479c DT |
115 | if (dev->rep[REP_PERIOD]) |
116 | mod_timer(&dev->timer, jiffies + | |
117 | msecs_to_jiffies(dev->rep[REP_PERIOD])); | |
118 | } | |
31581066 | 119 | |
8006479c DT |
120 | spin_unlock_irqrestore(&dev->event_lock, flags); |
121 | } | |
31581066 | 122 | |
8006479c DT |
123 | static void input_start_autorepeat(struct input_dev *dev, int code) |
124 | { | |
125 | if (test_bit(EV_REP, dev->evbit) && | |
126 | dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && | |
127 | dev->timer.data) { | |
128 | dev->repeat_key = code; | |
129 | mod_timer(&dev->timer, | |
130 | jiffies + msecs_to_jiffies(dev->rep[REP_DELAY])); | |
131 | } | |
132 | } | |
31581066 | 133 | |
8006479c DT |
134 | #define INPUT_IGNORE_EVENT 0 |
135 | #define INPUT_PASS_TO_HANDLERS 1 | |
136 | #define INPUT_PASS_TO_DEVICE 2 | |
137 | #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE) | |
1da177e4 | 138 | |
8006479c DT |
139 | static void input_handle_event(struct input_dev *dev, |
140 | unsigned int type, unsigned int code, int value) | |
141 | { | |
142 | int disposition = INPUT_IGNORE_EVENT; | |
1da177e4 | 143 | |
8006479c | 144 | switch (type) { |
1da177e4 | 145 | |
8006479c DT |
146 | case EV_SYN: |
147 | switch (code) { | |
148 | case SYN_CONFIG: | |
149 | disposition = INPUT_PASS_TO_ALL; | |
150 | break; | |
1da177e4 | 151 | |
8006479c DT |
152 | case SYN_REPORT: |
153 | if (!dev->sync) { | |
154 | dev->sync = 1; | |
155 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 156 | } |
1da177e4 | 157 | break; |
8006479c DT |
158 | } |
159 | break; | |
1da177e4 | 160 | |
8006479c DT |
161 | case EV_KEY: |
162 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
163 | !!test_bit(code, dev->key) != value) { | |
1da177e4 | 164 | |
8006479c DT |
165 | if (value != 2) { |
166 | __change_bit(code, dev->key); | |
167 | if (value) | |
168 | input_start_autorepeat(dev, code); | |
169 | } | |
1da177e4 | 170 | |
8006479c DT |
171 | disposition = INPUT_PASS_TO_HANDLERS; |
172 | } | |
173 | break; | |
1da177e4 | 174 | |
8006479c DT |
175 | case EV_SW: |
176 | if (is_event_supported(code, dev->swbit, SW_MAX) && | |
177 | !!test_bit(code, dev->sw) != value) { | |
1da177e4 | 178 | |
8006479c DT |
179 | __change_bit(code, dev->sw); |
180 | disposition = INPUT_PASS_TO_HANDLERS; | |
181 | } | |
182 | break; | |
1da177e4 | 183 | |
8006479c DT |
184 | case EV_ABS: |
185 | if (is_event_supported(code, dev->absbit, ABS_MAX)) { | |
1da177e4 | 186 | |
8006479c DT |
187 | value = input_defuzz_abs_event(value, |
188 | dev->abs[code], dev->absfuzz[code]); | |
1da177e4 | 189 | |
8006479c DT |
190 | if (dev->abs[code] != value) { |
191 | dev->abs[code] = value; | |
192 | disposition = INPUT_PASS_TO_HANDLERS; | |
193 | } | |
194 | } | |
195 | break; | |
1da177e4 | 196 | |
8006479c DT |
197 | case EV_REL: |
198 | if (is_event_supported(code, dev->relbit, REL_MAX) && value) | |
199 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 200 | |
8006479c | 201 | break; |
1e0afb28 | 202 | |
8006479c DT |
203 | case EV_MSC: |
204 | if (is_event_supported(code, dev->mscbit, MSC_MAX)) | |
205 | disposition = INPUT_PASS_TO_ALL; | |
1da177e4 | 206 | |
8006479c | 207 | break; |
1da177e4 | 208 | |
8006479c DT |
209 | case EV_LED: |
210 | if (is_event_supported(code, dev->ledbit, LED_MAX) && | |
211 | !!test_bit(code, dev->led) != value) { | |
1da177e4 | 212 | |
8006479c DT |
213 | __change_bit(code, dev->led); |
214 | disposition = INPUT_PASS_TO_ALL; | |
215 | } | |
216 | break; | |
217 | ||
218 | case EV_SND: | |
219 | if (is_event_supported(code, dev->sndbit, SND_MAX)) { | |
1da177e4 | 220 | |
8fdc1948 | 221 | if (!!test_bit(code, dev->snd) != !!value) |
8006479c DT |
222 | __change_bit(code, dev->snd); |
223 | disposition = INPUT_PASS_TO_ALL; | |
224 | } | |
225 | break; | |
8fdc1948 | 226 | |
8006479c DT |
227 | case EV_REP: |
228 | if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) { | |
229 | dev->rep[code] = value; | |
230 | disposition = INPUT_PASS_TO_ALL; | |
231 | } | |
232 | break; | |
1da177e4 | 233 | |
8006479c DT |
234 | case EV_FF: |
235 | if (value >= 0) | |
236 | disposition = INPUT_PASS_TO_ALL; | |
237 | break; | |
ed2fa4dd RP |
238 | |
239 | case EV_PWR: | |
240 | disposition = INPUT_PASS_TO_ALL; | |
241 | break; | |
8006479c | 242 | } |
1da177e4 | 243 | |
8006479c DT |
244 | if (type != EV_SYN) |
245 | dev->sync = 0; | |
1da177e4 | 246 | |
8006479c DT |
247 | if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event) |
248 | dev->event(dev, type, code, value); | |
1da177e4 | 249 | |
8006479c DT |
250 | if (disposition & INPUT_PASS_TO_HANDLERS) |
251 | input_pass_event(dev, type, code, value); | |
252 | } | |
1da177e4 | 253 | |
8006479c DT |
254 | /** |
255 | * input_event() - report new input event | |
256 | * @dev: device that generated the event | |
257 | * @type: type of the event | |
258 | * @code: event code | |
259 | * @value: value of the event | |
260 | * | |
261 | * This function should be used by drivers implementing various input | |
262 | * devices. See also input_inject_event(). | |
263 | */ | |
1da177e4 | 264 | |
8006479c DT |
265 | void input_event(struct input_dev *dev, |
266 | unsigned int type, unsigned int code, int value) | |
267 | { | |
268 | unsigned long flags; | |
509ca1a9 | 269 | |
8006479c | 270 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
509ca1a9 | 271 | |
8006479c DT |
272 | spin_lock_irqsave(&dev->event_lock, flags); |
273 | add_input_randomness(type, code, value); | |
274 | input_handle_event(dev, type, code, value); | |
275 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1da177e4 | 276 | } |
1da177e4 | 277 | } |
ca56fe07 | 278 | EXPORT_SYMBOL(input_event); |
1da177e4 | 279 | |
0e739d28 DT |
280 | /** |
281 | * input_inject_event() - send input event from input handler | |
282 | * @handle: input handle to send event through | |
283 | * @type: type of the event | |
284 | * @code: event code | |
285 | * @value: value of the event | |
286 | * | |
8006479c DT |
287 | * Similar to input_event() but will ignore event if device is |
288 | * "grabbed" and handle injecting event is not the one that owns | |
289 | * the device. | |
0e739d28 | 290 | */ |
8006479c DT |
291 | void input_inject_event(struct input_handle *handle, |
292 | unsigned int type, unsigned int code, int value) | |
1da177e4 | 293 | { |
8006479c DT |
294 | struct input_dev *dev = handle->dev; |
295 | struct input_handle *grab; | |
296 | unsigned long flags; | |
1da177e4 | 297 | |
8006479c DT |
298 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
299 | spin_lock_irqsave(&dev->event_lock, flags); | |
1da177e4 | 300 | |
82ba56c2 | 301 | rcu_read_lock(); |
8006479c DT |
302 | grab = rcu_dereference(dev->grab); |
303 | if (!grab || grab == handle) | |
304 | input_handle_event(dev, type, code, value); | |
82ba56c2 | 305 | rcu_read_unlock(); |
1da177e4 | 306 | |
8006479c DT |
307 | spin_unlock_irqrestore(&dev->event_lock, flags); |
308 | } | |
1da177e4 | 309 | } |
8006479c | 310 | EXPORT_SYMBOL(input_inject_event); |
1da177e4 | 311 | |
8006479c DT |
312 | /** |
313 | * input_grab_device - grabs device for exclusive use | |
314 | * @handle: input handle that wants to own the device | |
315 | * | |
316 | * When a device is grabbed by an input handle all events generated by | |
317 | * the device are delivered only to this handle. Also events injected | |
318 | * by other input handles are ignored while device is grabbed. | |
319 | */ | |
1da177e4 LT |
320 | int input_grab_device(struct input_handle *handle) |
321 | { | |
8006479c DT |
322 | struct input_dev *dev = handle->dev; |
323 | int retval; | |
1da177e4 | 324 | |
8006479c DT |
325 | retval = mutex_lock_interruptible(&dev->mutex); |
326 | if (retval) | |
327 | return retval; | |
328 | ||
329 | if (dev->grab) { | |
330 | retval = -EBUSY; | |
331 | goto out; | |
332 | } | |
333 | ||
334 | rcu_assign_pointer(dev->grab, handle); | |
82ba56c2 | 335 | synchronize_rcu(); |
8006479c DT |
336 | |
337 | out: | |
338 | mutex_unlock(&dev->mutex); | |
339 | return retval; | |
1da177e4 | 340 | } |
ca56fe07 | 341 | EXPORT_SYMBOL(input_grab_device); |
1da177e4 | 342 | |
8006479c | 343 | static void __input_release_device(struct input_handle *handle) |
1da177e4 | 344 | { |
a2b2ed2c | 345 | struct input_dev *dev = handle->dev; |
c7e8dc6e | 346 | |
a2b2ed2c | 347 | if (dev->grab == handle) { |
8006479c DT |
348 | rcu_assign_pointer(dev->grab, NULL); |
349 | /* Make sure input_pass_event() notices that grab is gone */ | |
82ba56c2 | 350 | synchronize_rcu(); |
a2b2ed2c AM |
351 | |
352 | list_for_each_entry(handle, &dev->h_list, d_node) | |
8006479c | 353 | if (handle->open && handle->handler->start) |
c7e8dc6e DT |
354 | handle->handler->start(handle); |
355 | } | |
1da177e4 | 356 | } |
8006479c DT |
357 | |
358 | /** | |
359 | * input_release_device - release previously grabbed device | |
360 | * @handle: input handle that owns the device | |
361 | * | |
362 | * Releases previously grabbed device so that other input handles can | |
363 | * start receiving input events. Upon release all handlers attached | |
364 | * to the device have their start() method called so they have a change | |
365 | * to synchronize device state with the rest of the system. | |
366 | */ | |
367 | void input_release_device(struct input_handle *handle) | |
368 | { | |
369 | struct input_dev *dev = handle->dev; | |
370 | ||
371 | mutex_lock(&dev->mutex); | |
372 | __input_release_device(handle); | |
373 | mutex_unlock(&dev->mutex); | |
374 | } | |
ca56fe07 | 375 | EXPORT_SYMBOL(input_release_device); |
1da177e4 | 376 | |
8006479c DT |
377 | /** |
378 | * input_open_device - open input device | |
379 | * @handle: handle through which device is being accessed | |
380 | * | |
381 | * This function should be called by input handlers when they | |
382 | * want to start receive events from given input device. | |
383 | */ | |
1da177e4 LT |
384 | int input_open_device(struct input_handle *handle) |
385 | { | |
0fbf87ca | 386 | struct input_dev *dev = handle->dev; |
8006479c | 387 | int retval; |
0fbf87ca | 388 | |
8006479c DT |
389 | retval = mutex_lock_interruptible(&dev->mutex); |
390 | if (retval) | |
391 | return retval; | |
392 | ||
393 | if (dev->going_away) { | |
394 | retval = -ENODEV; | |
395 | goto out; | |
396 | } | |
0fbf87ca | 397 | |
1da177e4 | 398 | handle->open++; |
0fbf87ca DT |
399 | |
400 | if (!dev->users++ && dev->open) | |
8006479c DT |
401 | retval = dev->open(dev); |
402 | ||
403 | if (retval) { | |
404 | dev->users--; | |
405 | if (!--handle->open) { | |
406 | /* | |
407 | * Make sure we are not delivering any more events | |
408 | * through this handle | |
409 | */ | |
82ba56c2 | 410 | synchronize_rcu(); |
8006479c DT |
411 | } |
412 | } | |
0fbf87ca | 413 | |
8006479c | 414 | out: |
e676c232 | 415 | mutex_unlock(&dev->mutex); |
8006479c | 416 | return retval; |
1da177e4 | 417 | } |
ca56fe07 | 418 | EXPORT_SYMBOL(input_open_device); |
1da177e4 | 419 | |
8006479c | 420 | int input_flush_device(struct input_handle *handle, struct file *file) |
1da177e4 | 421 | { |
8006479c DT |
422 | struct input_dev *dev = handle->dev; |
423 | int retval; | |
1da177e4 | 424 | |
8006479c DT |
425 | retval = mutex_lock_interruptible(&dev->mutex); |
426 | if (retval) | |
427 | return retval; | |
428 | ||
429 | if (dev->flush) | |
430 | retval = dev->flush(dev, file); | |
431 | ||
432 | mutex_unlock(&dev->mutex); | |
433 | return retval; | |
1da177e4 | 434 | } |
ca56fe07 | 435 | EXPORT_SYMBOL(input_flush_device); |
1da177e4 | 436 | |
8006479c DT |
437 | /** |
438 | * input_close_device - close input device | |
439 | * @handle: handle through which device is being accessed | |
440 | * | |
441 | * This function should be called by input handlers when they | |
442 | * want to stop receive events from given input device. | |
443 | */ | |
1da177e4 LT |
444 | void input_close_device(struct input_handle *handle) |
445 | { | |
0fbf87ca DT |
446 | struct input_dev *dev = handle->dev; |
447 | ||
e676c232 | 448 | mutex_lock(&dev->mutex); |
0fbf87ca | 449 | |
8006479c DT |
450 | __input_release_device(handle); |
451 | ||
0fbf87ca DT |
452 | if (!--dev->users && dev->close) |
453 | dev->close(dev); | |
8006479c DT |
454 | |
455 | if (!--handle->open) { | |
456 | /* | |
82ba56c2 | 457 | * synchronize_rcu() makes sure that input_pass_event() |
8006479c DT |
458 | * completed and that no more input events are delivered |
459 | * through this handle | |
460 | */ | |
82ba56c2 | 461 | synchronize_rcu(); |
8006479c | 462 | } |
0fbf87ca | 463 | |
e676c232 | 464 | mutex_unlock(&dev->mutex); |
1da177e4 | 465 | } |
ca56fe07 | 466 | EXPORT_SYMBOL(input_close_device); |
1da177e4 | 467 | |
8006479c DT |
468 | /* |
469 | * Prepare device for unregistering | |
470 | */ | |
471 | static void input_disconnect_device(struct input_dev *dev) | |
472 | { | |
473 | struct input_handle *handle; | |
474 | int code; | |
475 | ||
476 | /* | |
477 | * Mark device as going away. Note that we take dev->mutex here | |
478 | * not to protect access to dev->going_away but rather to ensure | |
479 | * that there are no threads in the middle of input_open_device() | |
480 | */ | |
481 | mutex_lock(&dev->mutex); | |
482 | dev->going_away = 1; | |
483 | mutex_unlock(&dev->mutex); | |
484 | ||
485 | spin_lock_irq(&dev->event_lock); | |
486 | ||
487 | /* | |
488 | * Simulate keyup events for all pressed keys so that handlers | |
489 | * are not left with "stuck" keys. The driver may continue | |
490 | * generate events even after we done here but they will not | |
491 | * reach any handlers. | |
492 | */ | |
493 | if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) { | |
494 | for (code = 0; code <= KEY_MAX; code++) { | |
495 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
f4f37c8e | 496 | __test_and_clear_bit(code, dev->key)) { |
8006479c DT |
497 | input_pass_event(dev, EV_KEY, code, 0); |
498 | } | |
499 | } | |
500 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
501 | } | |
502 | ||
503 | list_for_each_entry(handle, &dev->h_list, d_node) | |
504 | handle->open = 0; | |
505 | ||
506 | spin_unlock_irq(&dev->event_lock); | |
507 | } | |
508 | ||
c8e4c772 MR |
509 | static int input_fetch_keycode(struct input_dev *dev, int scancode) |
510 | { | |
511 | switch (dev->keycodesize) { | |
512 | case 1: | |
513 | return ((u8 *)dev->keycode)[scancode]; | |
514 | ||
515 | case 2: | |
516 | return ((u16 *)dev->keycode)[scancode]; | |
517 | ||
518 | default: | |
519 | return ((u32 *)dev->keycode)[scancode]; | |
520 | } | |
521 | } | |
522 | ||
523 | static int input_default_getkeycode(struct input_dev *dev, | |
524 | int scancode, int *keycode) | |
525 | { | |
526 | if (!dev->keycodesize) | |
527 | return -EINVAL; | |
528 | ||
f4f37c8e | 529 | if (scancode >= dev->keycodemax) |
c8e4c772 MR |
530 | return -EINVAL; |
531 | ||
532 | *keycode = input_fetch_keycode(dev, scancode); | |
533 | ||
534 | return 0; | |
535 | } | |
536 | ||
537 | static int input_default_setkeycode(struct input_dev *dev, | |
538 | int scancode, int keycode) | |
539 | { | |
540 | int old_keycode; | |
541 | int i; | |
542 | ||
f4f37c8e | 543 | if (scancode >= dev->keycodemax) |
c8e4c772 MR |
544 | return -EINVAL; |
545 | ||
546 | if (!dev->keycodesize) | |
547 | return -EINVAL; | |
548 | ||
549 | if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8))) | |
550 | return -EINVAL; | |
551 | ||
552 | switch (dev->keycodesize) { | |
553 | case 1: { | |
554 | u8 *k = (u8 *)dev->keycode; | |
555 | old_keycode = k[scancode]; | |
556 | k[scancode] = keycode; | |
557 | break; | |
558 | } | |
559 | case 2: { | |
560 | u16 *k = (u16 *)dev->keycode; | |
561 | old_keycode = k[scancode]; | |
562 | k[scancode] = keycode; | |
563 | break; | |
564 | } | |
565 | default: { | |
566 | u32 *k = (u32 *)dev->keycode; | |
567 | old_keycode = k[scancode]; | |
568 | k[scancode] = keycode; | |
569 | break; | |
570 | } | |
571 | } | |
572 | ||
573 | clear_bit(old_keycode, dev->keybit); | |
574 | set_bit(keycode, dev->keybit); | |
575 | ||
576 | for (i = 0; i < dev->keycodemax; i++) { | |
577 | if (input_fetch_keycode(dev, i) == old_keycode) { | |
578 | set_bit(old_keycode, dev->keybit); | |
579 | break; /* Setting the bit twice is useless, so break */ | |
580 | } | |
581 | } | |
582 | ||
583 | return 0; | |
584 | } | |
585 | ||
f4f37c8e DT |
586 | /** |
587 | * input_get_keycode - retrieve keycode currently mapped to a given scancode | |
588 | * @dev: input device which keymap is being queried | |
589 | * @scancode: scancode (or its equivalent for device in question) for which | |
590 | * keycode is needed | |
591 | * @keycode: result | |
592 | * | |
593 | * This function should be called by anyone interested in retrieving current | |
594 | * keymap. Presently keyboard and evdev handlers use it. | |
595 | */ | |
596 | int input_get_keycode(struct input_dev *dev, int scancode, int *keycode) | |
597 | { | |
598 | if (scancode < 0) | |
599 | return -EINVAL; | |
600 | ||
601 | return dev->getkeycode(dev, scancode, keycode); | |
602 | } | |
603 | EXPORT_SYMBOL(input_get_keycode); | |
604 | ||
605 | /** | |
606 | * input_get_keycode - assign new keycode to a given scancode | |
607 | * @dev: input device which keymap is being updated | |
608 | * @scancode: scancode (or its equivalent for device in question) | |
609 | * @keycode: new keycode to be assigned to the scancode | |
610 | * | |
611 | * This function should be called by anyone needing to update current | |
612 | * keymap. Presently keyboard and evdev handlers use it. | |
613 | */ | |
614 | int input_set_keycode(struct input_dev *dev, int scancode, int keycode) | |
615 | { | |
616 | unsigned long flags; | |
617 | int old_keycode; | |
618 | int retval; | |
619 | ||
620 | if (scancode < 0) | |
621 | return -EINVAL; | |
622 | ||
623 | if (keycode < 0 || keycode > KEY_MAX) | |
624 | return -EINVAL; | |
625 | ||
626 | spin_lock_irqsave(&dev->event_lock, flags); | |
627 | ||
628 | retval = dev->getkeycode(dev, scancode, &old_keycode); | |
629 | if (retval) | |
630 | goto out; | |
631 | ||
632 | retval = dev->setkeycode(dev, scancode, keycode); | |
633 | if (retval) | |
634 | goto out; | |
635 | ||
636 | /* | |
637 | * Simulate keyup event if keycode is not present | |
638 | * in the keymap anymore | |
639 | */ | |
640 | if (test_bit(EV_KEY, dev->evbit) && | |
641 | !is_event_supported(old_keycode, dev->keybit, KEY_MAX) && | |
642 | __test_and_clear_bit(old_keycode, dev->key)) { | |
643 | ||
644 | input_pass_event(dev, EV_KEY, old_keycode, 0); | |
645 | if (dev->sync) | |
646 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
647 | } | |
648 | ||
649 | out: | |
650 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
651 | ||
652 | return retval; | |
653 | } | |
654 | EXPORT_SYMBOL(input_set_keycode); | |
c8e4c772 | 655 | |
1da177e4 | 656 | #define MATCH_BIT(bit, max) \ |
7b19ada2 | 657 | for (i = 0; i < BITS_TO_LONGS(max); i++) \ |
1da177e4 LT |
658 | if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \ |
659 | break; \ | |
7b19ada2 | 660 | if (i != BITS_TO_LONGS(max)) \ |
1da177e4 LT |
661 | continue; |
662 | ||
66e66118 DT |
663 | static const struct input_device_id *input_match_device(const struct input_device_id *id, |
664 | struct input_dev *dev) | |
1da177e4 LT |
665 | { |
666 | int i; | |
667 | ||
668 | for (; id->flags || id->driver_info; id++) { | |
669 | ||
670 | if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) | |
ddc5d341 | 671 | if (id->bustype != dev->id.bustype) |
1da177e4 LT |
672 | continue; |
673 | ||
674 | if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) | |
ddc5d341 | 675 | if (id->vendor != dev->id.vendor) |
1da177e4 LT |
676 | continue; |
677 | ||
678 | if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) | |
ddc5d341 | 679 | if (id->product != dev->id.product) |
1da177e4 LT |
680 | continue; |
681 | ||
682 | if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) | |
ddc5d341 | 683 | if (id->version != dev->id.version) |
1da177e4 LT |
684 | continue; |
685 | ||
686 | MATCH_BIT(evbit, EV_MAX); | |
687 | MATCH_BIT(keybit, KEY_MAX); | |
688 | MATCH_BIT(relbit, REL_MAX); | |
689 | MATCH_BIT(absbit, ABS_MAX); | |
690 | MATCH_BIT(mscbit, MSC_MAX); | |
691 | MATCH_BIT(ledbit, LED_MAX); | |
692 | MATCH_BIT(sndbit, SND_MAX); | |
693 | MATCH_BIT(ffbit, FF_MAX); | |
ff13f98b | 694 | MATCH_BIT(swbit, SW_MAX); |
1da177e4 LT |
695 | |
696 | return id; | |
697 | } | |
698 | ||
699 | return NULL; | |
700 | } | |
701 | ||
5b2a0826 DT |
702 | static int input_attach_handler(struct input_dev *dev, struct input_handler *handler) |
703 | { | |
704 | const struct input_device_id *id; | |
705 | int error; | |
706 | ||
707 | if (handler->blacklist && input_match_device(handler->blacklist, dev)) | |
708 | return -ENODEV; | |
709 | ||
710 | id = input_match_device(handler->id_table, dev); | |
711 | if (!id) | |
712 | return -ENODEV; | |
713 | ||
714 | error = handler->connect(handler, dev, id); | |
715 | if (error && error != -ENODEV) | |
716 | printk(KERN_ERR | |
717 | "input: failed to attach handler %s to device %s, " | |
718 | "error: %d\n", | |
9657d75c | 719 | handler->name, kobject_name(&dev->dev.kobj), error); |
5b2a0826 DT |
720 | |
721 | return error; | |
722 | } | |
723 | ||
724 | ||
f96b434d DT |
725 | #ifdef CONFIG_PROC_FS |
726 | ||
727 | static struct proc_dir_entry *proc_bus_input_dir; | |
728 | static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); | |
729 | static int input_devices_state; | |
730 | ||
731 | static inline void input_wakeup_procfs_readers(void) | |
732 | { | |
733 | input_devices_state++; | |
734 | wake_up(&input_devices_poll_wait); | |
735 | } | |
736 | ||
969b21cd | 737 | static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait) |
f96b434d DT |
738 | { |
739 | int state = input_devices_state; | |
1e0afb28 | 740 | |
f96b434d DT |
741 | poll_wait(file, &input_devices_poll_wait, wait); |
742 | if (state != input_devices_state) | |
743 | return POLLIN | POLLRDNORM; | |
1e0afb28 | 744 | |
f96b434d DT |
745 | return 0; |
746 | } | |
747 | ||
969b21cd DT |
748 | static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) |
749 | { | |
8006479c DT |
750 | if (mutex_lock_interruptible(&input_mutex)) |
751 | return NULL; | |
f96b434d | 752 | |
ad5d972c | 753 | return seq_list_start(&input_dev_list, *pos); |
969b21cd | 754 | } |
051b2fea | 755 | |
969b21cd DT |
756 | static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
757 | { | |
ad5d972c | 758 | return seq_list_next(v, &input_dev_list, pos); |
969b21cd | 759 | } |
f96b434d | 760 | |
969b21cd DT |
761 | static void input_devices_seq_stop(struct seq_file *seq, void *v) |
762 | { | |
8006479c | 763 | mutex_unlock(&input_mutex); |
969b21cd | 764 | } |
f96b434d | 765 | |
969b21cd DT |
766 | static void input_seq_print_bitmap(struct seq_file *seq, const char *name, |
767 | unsigned long *bitmap, int max) | |
768 | { | |
769 | int i; | |
051b2fea | 770 | |
7b19ada2 | 771 | for (i = BITS_TO_LONGS(max) - 1; i > 0; i--) |
969b21cd DT |
772 | if (bitmap[i]) |
773 | break; | |
f96b434d | 774 | |
969b21cd DT |
775 | seq_printf(seq, "B: %s=", name); |
776 | for (; i >= 0; i--) | |
777 | seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : ""); | |
778 | seq_putc(seq, '\n'); | |
779 | } | |
f96b434d | 780 | |
969b21cd DT |
781 | static int input_devices_seq_show(struct seq_file *seq, void *v) |
782 | { | |
783 | struct input_dev *dev = container_of(v, struct input_dev, node); | |
9657d75c | 784 | const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
969b21cd DT |
785 | struct input_handle *handle; |
786 | ||
787 | seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", | |
788 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); | |
789 | ||
790 | seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); | |
791 | seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : ""); | |
792 | seq_printf(seq, "S: Sysfs=%s\n", path ? path : ""); | |
15e03ae8 | 793 | seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : ""); |
969b21cd DT |
794 | seq_printf(seq, "H: Handlers="); |
795 | ||
796 | list_for_each_entry(handle, &dev->h_list, d_node) | |
797 | seq_printf(seq, "%s ", handle->name); | |
798 | seq_putc(seq, '\n'); | |
799 | ||
800 | input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); | |
801 | if (test_bit(EV_KEY, dev->evbit)) | |
802 | input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); | |
803 | if (test_bit(EV_REL, dev->evbit)) | |
804 | input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); | |
805 | if (test_bit(EV_ABS, dev->evbit)) | |
806 | input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); | |
807 | if (test_bit(EV_MSC, dev->evbit)) | |
808 | input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); | |
809 | if (test_bit(EV_LED, dev->evbit)) | |
810 | input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); | |
811 | if (test_bit(EV_SND, dev->evbit)) | |
812 | input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); | |
813 | if (test_bit(EV_FF, dev->evbit)) | |
814 | input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); | |
815 | if (test_bit(EV_SW, dev->evbit)) | |
816 | input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); | |
817 | ||
818 | seq_putc(seq, '\n'); | |
819 | ||
820 | kfree(path); | |
821 | return 0; | |
f96b434d DT |
822 | } |
823 | ||
cec69c37 | 824 | static const struct seq_operations input_devices_seq_ops = { |
969b21cd DT |
825 | .start = input_devices_seq_start, |
826 | .next = input_devices_seq_next, | |
827 | .stop = input_devices_seq_stop, | |
828 | .show = input_devices_seq_show, | |
829 | }; | |
830 | ||
831 | static int input_proc_devices_open(struct inode *inode, struct file *file) | |
f96b434d | 832 | { |
969b21cd DT |
833 | return seq_open(file, &input_devices_seq_ops); |
834 | } | |
835 | ||
2b8693c0 | 836 | static const struct file_operations input_devices_fileops = { |
969b21cd DT |
837 | .owner = THIS_MODULE, |
838 | .open = input_proc_devices_open, | |
839 | .poll = input_proc_devices_poll, | |
840 | .read = seq_read, | |
841 | .llseek = seq_lseek, | |
842 | .release = seq_release, | |
843 | }; | |
844 | ||
845 | static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) | |
846 | { | |
8006479c DT |
847 | if (mutex_lock_interruptible(&input_mutex)) |
848 | return NULL; | |
849 | ||
969b21cd | 850 | seq->private = (void *)(unsigned long)*pos; |
ad5d972c | 851 | return seq_list_start(&input_handler_list, *pos); |
969b21cd | 852 | } |
f96b434d | 853 | |
969b21cd DT |
854 | static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
855 | { | |
856 | seq->private = (void *)(unsigned long)(*pos + 1); | |
ad5d972c | 857 | return seq_list_next(v, &input_handler_list, pos); |
f96b434d DT |
858 | } |
859 | ||
969b21cd DT |
860 | static void input_handlers_seq_stop(struct seq_file *seq, void *v) |
861 | { | |
8006479c | 862 | mutex_unlock(&input_mutex); |
969b21cd DT |
863 | } |
864 | ||
865 | static int input_handlers_seq_show(struct seq_file *seq, void *v) | |
866 | { | |
867 | struct input_handler *handler = container_of(v, struct input_handler, node); | |
868 | ||
869 | seq_printf(seq, "N: Number=%ld Name=%s", | |
870 | (unsigned long)seq->private, handler->name); | |
871 | if (handler->fops) | |
872 | seq_printf(seq, " Minor=%d", handler->minor); | |
873 | seq_putc(seq, '\n'); | |
874 | ||
875 | return 0; | |
876 | } | |
cec69c37 | 877 | static const struct seq_operations input_handlers_seq_ops = { |
969b21cd DT |
878 | .start = input_handlers_seq_start, |
879 | .next = input_handlers_seq_next, | |
880 | .stop = input_handlers_seq_stop, | |
881 | .show = input_handlers_seq_show, | |
882 | }; | |
883 | ||
884 | static int input_proc_handlers_open(struct inode *inode, struct file *file) | |
885 | { | |
886 | return seq_open(file, &input_handlers_seq_ops); | |
887 | } | |
888 | ||
2b8693c0 | 889 | static const struct file_operations input_handlers_fileops = { |
969b21cd DT |
890 | .owner = THIS_MODULE, |
891 | .open = input_proc_handlers_open, | |
892 | .read = seq_read, | |
893 | .llseek = seq_lseek, | |
894 | .release = seq_release, | |
895 | }; | |
f96b434d DT |
896 | |
897 | static int __init input_proc_init(void) | |
898 | { | |
899 | struct proc_dir_entry *entry; | |
900 | ||
9c37066d | 901 | proc_bus_input_dir = proc_mkdir("bus/input", NULL); |
f96b434d DT |
902 | if (!proc_bus_input_dir) |
903 | return -ENOMEM; | |
904 | ||
905 | proc_bus_input_dir->owner = THIS_MODULE; | |
906 | ||
c7705f34 DL |
907 | entry = proc_create("devices", 0, proc_bus_input_dir, |
908 | &input_devices_fileops); | |
f96b434d DT |
909 | if (!entry) |
910 | goto fail1; | |
911 | ||
c7705f34 DL |
912 | entry = proc_create("handlers", 0, proc_bus_input_dir, |
913 | &input_handlers_fileops); | |
f96b434d DT |
914 | if (!entry) |
915 | goto fail2; | |
916 | ||
f96b434d DT |
917 | return 0; |
918 | ||
919 | fail2: remove_proc_entry("devices", proc_bus_input_dir); | |
9c37066d | 920 | fail1: remove_proc_entry("bus/input", NULL); |
f96b434d DT |
921 | return -ENOMEM; |
922 | } | |
923 | ||
beffbdc2 | 924 | static void input_proc_exit(void) |
f96b434d DT |
925 | { |
926 | remove_proc_entry("devices", proc_bus_input_dir); | |
927 | remove_proc_entry("handlers", proc_bus_input_dir); | |
9c37066d | 928 | remove_proc_entry("bus/input", NULL); |
f96b434d DT |
929 | } |
930 | ||
931 | #else /* !CONFIG_PROC_FS */ | |
932 | static inline void input_wakeup_procfs_readers(void) { } | |
933 | static inline int input_proc_init(void) { return 0; } | |
934 | static inline void input_proc_exit(void) { } | |
935 | #endif | |
936 | ||
9657d75c DT |
937 | #define INPUT_DEV_STRING_ATTR_SHOW(name) \ |
938 | static ssize_t input_dev_show_##name(struct device *dev, \ | |
939 | struct device_attribute *attr, \ | |
940 | char *buf) \ | |
941 | { \ | |
942 | struct input_dev *input_dev = to_input_dev(dev); \ | |
943 | \ | |
944 | return scnprintf(buf, PAGE_SIZE, "%s\n", \ | |
945 | input_dev->name ? input_dev->name : ""); \ | |
946 | } \ | |
947 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL) | |
5c1e9a6a DT |
948 | |
949 | INPUT_DEV_STRING_ATTR_SHOW(name); | |
950 | INPUT_DEV_STRING_ATTR_SHOW(phys); | |
951 | INPUT_DEV_STRING_ATTR_SHOW(uniq); | |
952 | ||
ac648a6a DT |
953 | static int input_print_modalias_bits(char *buf, int size, |
954 | char name, unsigned long *bm, | |
955 | unsigned int min_bit, unsigned int max_bit) | |
1d8f430c | 956 | { |
ac648a6a | 957 | int len = 0, i; |
1d8f430c | 958 | |
ac648a6a DT |
959 | len += snprintf(buf, max(size, 0), "%c", name); |
960 | for (i = min_bit; i < max_bit; i++) | |
7b19ada2 | 961 | if (bm[BIT_WORD(i)] & BIT_MASK(i)) |
ac648a6a | 962 | len += snprintf(buf + len, max(size - len, 0), "%X,", i); |
1d8f430c RR |
963 | return len; |
964 | } | |
965 | ||
2db66876 DT |
966 | static int input_print_modalias(char *buf, int size, struct input_dev *id, |
967 | int add_cr) | |
1d8f430c | 968 | { |
bd37e5a9 | 969 | int len; |
1d8f430c | 970 | |
ac648a6a DT |
971 | len = snprintf(buf, max(size, 0), |
972 | "input:b%04Xv%04Xp%04Xe%04X-", | |
973 | id->id.bustype, id->id.vendor, | |
974 | id->id.product, id->id.version); | |
975 | ||
976 | len += input_print_modalias_bits(buf + len, size - len, | |
977 | 'e', id->evbit, 0, EV_MAX); | |
978 | len += input_print_modalias_bits(buf + len, size - len, | |
979 | 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); | |
980 | len += input_print_modalias_bits(buf + len, size - len, | |
981 | 'r', id->relbit, 0, REL_MAX); | |
982 | len += input_print_modalias_bits(buf + len, size - len, | |
983 | 'a', id->absbit, 0, ABS_MAX); | |
984 | len += input_print_modalias_bits(buf + len, size - len, | |
985 | 'm', id->mscbit, 0, MSC_MAX); | |
986 | len += input_print_modalias_bits(buf + len, size - len, | |
987 | 'l', id->ledbit, 0, LED_MAX); | |
988 | len += input_print_modalias_bits(buf + len, size - len, | |
989 | 's', id->sndbit, 0, SND_MAX); | |
990 | len += input_print_modalias_bits(buf + len, size - len, | |
991 | 'f', id->ffbit, 0, FF_MAX); | |
992 | len += input_print_modalias_bits(buf + len, size - len, | |
993 | 'w', id->swbit, 0, SW_MAX); | |
2db66876 DT |
994 | |
995 | if (add_cr) | |
ac648a6a | 996 | len += snprintf(buf + len, max(size - len, 0), "\n"); |
2db66876 | 997 | |
bd37e5a9 KS |
998 | return len; |
999 | } | |
1000 | ||
9657d75c DT |
1001 | static ssize_t input_dev_show_modalias(struct device *dev, |
1002 | struct device_attribute *attr, | |
1003 | char *buf) | |
bd37e5a9 KS |
1004 | { |
1005 | struct input_dev *id = to_input_dev(dev); | |
1006 | ssize_t len; | |
1007 | ||
2db66876 DT |
1008 | len = input_print_modalias(buf, PAGE_SIZE, id, 1); |
1009 | ||
8a3cf456 | 1010 | return min_t(int, len, PAGE_SIZE); |
1d8f430c | 1011 | } |
9657d75c | 1012 | static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); |
1d8f430c | 1013 | |
629b77a4 | 1014 | static struct attribute *input_dev_attrs[] = { |
9657d75c DT |
1015 | &dev_attr_name.attr, |
1016 | &dev_attr_phys.attr, | |
1017 | &dev_attr_uniq.attr, | |
1018 | &dev_attr_modalias.attr, | |
629b77a4 GKH |
1019 | NULL |
1020 | }; | |
1021 | ||
bd0ef235 | 1022 | static struct attribute_group input_dev_attr_group = { |
629b77a4 | 1023 | .attrs = input_dev_attrs, |
5c1e9a6a DT |
1024 | }; |
1025 | ||
9657d75c DT |
1026 | #define INPUT_DEV_ID_ATTR(name) \ |
1027 | static ssize_t input_dev_show_id_##name(struct device *dev, \ | |
1028 | struct device_attribute *attr, \ | |
1029 | char *buf) \ | |
1030 | { \ | |
1031 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1032 | return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \ | |
1033 | } \ | |
1034 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL) | |
5c1e9a6a DT |
1035 | |
1036 | INPUT_DEV_ID_ATTR(bustype); | |
1037 | INPUT_DEV_ID_ATTR(vendor); | |
1038 | INPUT_DEV_ID_ATTR(product); | |
1039 | INPUT_DEV_ID_ATTR(version); | |
1040 | ||
1041 | static struct attribute *input_dev_id_attrs[] = { | |
9657d75c DT |
1042 | &dev_attr_bustype.attr, |
1043 | &dev_attr_vendor.attr, | |
1044 | &dev_attr_product.attr, | |
1045 | &dev_attr_version.attr, | |
5c1e9a6a DT |
1046 | NULL |
1047 | }; | |
1048 | ||
1049 | static struct attribute_group input_dev_id_attr_group = { | |
1050 | .name = "id", | |
1051 | .attrs = input_dev_id_attrs, | |
1052 | }; | |
1053 | ||
969b21cd DT |
1054 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1055 | int max, int add_cr) | |
1056 | { | |
1057 | int i; | |
1058 | int len = 0; | |
1059 | ||
7b19ada2 | 1060 | for (i = BITS_TO_LONGS(max) - 1; i > 0; i--) |
969b21cd DT |
1061 | if (bitmap[i]) |
1062 | break; | |
1063 | ||
1064 | for (; i >= 0; i--) | |
1065 | len += snprintf(buf + len, max(buf_size - len, 0), | |
1066 | "%lx%s", bitmap[i], i > 0 ? " " : ""); | |
1067 | ||
1068 | if (add_cr) | |
1069 | len += snprintf(buf + len, max(buf_size - len, 0), "\n"); | |
1070 | ||
1071 | return len; | |
1072 | } | |
1073 | ||
9657d75c DT |
1074 | #define INPUT_DEV_CAP_ATTR(ev, bm) \ |
1075 | static ssize_t input_dev_show_cap_##bm(struct device *dev, \ | |
1076 | struct device_attribute *attr, \ | |
1077 | char *buf) \ | |
1078 | { \ | |
1079 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1080 | int len = input_print_bitmap(buf, PAGE_SIZE, \ | |
1081 | input_dev->bm##bit, ev##_MAX, 1); \ | |
1082 | return min_t(int, len, PAGE_SIZE); \ | |
1083 | } \ | |
1084 | static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL) | |
5c1e9a6a DT |
1085 | |
1086 | INPUT_DEV_CAP_ATTR(EV, ev); | |
1087 | INPUT_DEV_CAP_ATTR(KEY, key); | |
1088 | INPUT_DEV_CAP_ATTR(REL, rel); | |
1089 | INPUT_DEV_CAP_ATTR(ABS, abs); | |
1090 | INPUT_DEV_CAP_ATTR(MSC, msc); | |
1091 | INPUT_DEV_CAP_ATTR(LED, led); | |
1092 | INPUT_DEV_CAP_ATTR(SND, snd); | |
1093 | INPUT_DEV_CAP_ATTR(FF, ff); | |
1094 | INPUT_DEV_CAP_ATTR(SW, sw); | |
1095 | ||
1096 | static struct attribute *input_dev_caps_attrs[] = { | |
9657d75c DT |
1097 | &dev_attr_ev.attr, |
1098 | &dev_attr_key.attr, | |
1099 | &dev_attr_rel.attr, | |
1100 | &dev_attr_abs.attr, | |
1101 | &dev_attr_msc.attr, | |
1102 | &dev_attr_led.attr, | |
1103 | &dev_attr_snd.attr, | |
1104 | &dev_attr_ff.attr, | |
1105 | &dev_attr_sw.attr, | |
5c1e9a6a DT |
1106 | NULL |
1107 | }; | |
1108 | ||
1109 | static struct attribute_group input_dev_caps_attr_group = { | |
1110 | .name = "capabilities", | |
1111 | .attrs = input_dev_caps_attrs, | |
1112 | }; | |
1113 | ||
cb9def4d DT |
1114 | static struct attribute_group *input_dev_attr_groups[] = { |
1115 | &input_dev_attr_group, | |
1116 | &input_dev_id_attr_group, | |
1117 | &input_dev_caps_attr_group, | |
1118 | NULL | |
1119 | }; | |
1120 | ||
9657d75c | 1121 | static void input_dev_release(struct device *device) |
d19fbe8a | 1122 | { |
9657d75c | 1123 | struct input_dev *dev = to_input_dev(device); |
d19fbe8a | 1124 | |
509ca1a9 | 1125 | input_ff_destroy(dev); |
d19fbe8a | 1126 | kfree(dev); |
509ca1a9 | 1127 | |
d19fbe8a DT |
1128 | module_put(THIS_MODULE); |
1129 | } | |
1130 | ||
a7fadbe1 | 1131 | /* |
312c004d | 1132 | * Input uevent interface - loading event handlers based on |
a7fadbe1 DT |
1133 | * device bitfields. |
1134 | */ | |
7eff2e7a | 1135 | static int input_add_uevent_bm_var(struct kobj_uevent_env *env, |
ac648a6a | 1136 | const char *name, unsigned long *bitmap, int max) |
a7fadbe1 | 1137 | { |
7eff2e7a | 1138 | int len; |
a7fadbe1 | 1139 | |
7eff2e7a | 1140 | if (add_uevent_var(env, "%s=", name)) |
a7fadbe1 DT |
1141 | return -ENOMEM; |
1142 | ||
7eff2e7a KS |
1143 | len = input_print_bitmap(&env->buf[env->buflen - 1], |
1144 | sizeof(env->buf) - env->buflen, | |
1145 | bitmap, max, 0); | |
1146 | if (len >= (sizeof(env->buf) - env->buflen)) | |
a7fadbe1 DT |
1147 | return -ENOMEM; |
1148 | ||
7eff2e7a | 1149 | env->buflen += len; |
a7fadbe1 DT |
1150 | return 0; |
1151 | } | |
1152 | ||
7eff2e7a | 1153 | static int input_add_uevent_modalias_var(struct kobj_uevent_env *env, |
ac648a6a DT |
1154 | struct input_dev *dev) |
1155 | { | |
7eff2e7a | 1156 | int len; |
ac648a6a | 1157 | |
7eff2e7a | 1158 | if (add_uevent_var(env, "MODALIAS=")) |
ac648a6a DT |
1159 | return -ENOMEM; |
1160 | ||
7eff2e7a KS |
1161 | len = input_print_modalias(&env->buf[env->buflen - 1], |
1162 | sizeof(env->buf) - env->buflen, | |
1163 | dev, 0); | |
1164 | if (len >= (sizeof(env->buf) - env->buflen)) | |
ac648a6a DT |
1165 | return -ENOMEM; |
1166 | ||
7eff2e7a | 1167 | env->buflen += len; |
ac648a6a DT |
1168 | return 0; |
1169 | } | |
1170 | ||
a7fadbe1 DT |
1171 | #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \ |
1172 | do { \ | |
7eff2e7a | 1173 | int err = add_uevent_var(env, fmt, val); \ |
a7fadbe1 DT |
1174 | if (err) \ |
1175 | return err; \ | |
1176 | } while (0) | |
1177 | ||
1178 | #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \ | |
1179 | do { \ | |
7eff2e7a | 1180 | int err = input_add_uevent_bm_var(env, name, bm, max); \ |
a7fadbe1 DT |
1181 | if (err) \ |
1182 | return err; \ | |
1183 | } while (0) | |
1184 | ||
ac648a6a DT |
1185 | #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \ |
1186 | do { \ | |
7eff2e7a | 1187 | int err = input_add_uevent_modalias_var(env, dev); \ |
ac648a6a DT |
1188 | if (err) \ |
1189 | return err; \ | |
1190 | } while (0) | |
1191 | ||
7eff2e7a | 1192 | static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env) |
a7fadbe1 | 1193 | { |
9657d75c | 1194 | struct input_dev *dev = to_input_dev(device); |
a7fadbe1 DT |
1195 | |
1196 | INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x", | |
1197 | dev->id.bustype, dev->id.vendor, | |
1198 | dev->id.product, dev->id.version); | |
1199 | if (dev->name) | |
1200 | INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); | |
1201 | if (dev->phys) | |
1202 | INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); | |
08de1f04 | 1203 | if (dev->uniq) |
a7fadbe1 DT |
1204 | INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); |
1205 | ||
1206 | INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX); | |
1207 | if (test_bit(EV_KEY, dev->evbit)) | |
1208 | INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX); | |
1209 | if (test_bit(EV_REL, dev->evbit)) | |
1210 | INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX); | |
1211 | if (test_bit(EV_ABS, dev->evbit)) | |
1212 | INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX); | |
1213 | if (test_bit(EV_MSC, dev->evbit)) | |
1214 | INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX); | |
1215 | if (test_bit(EV_LED, dev->evbit)) | |
1216 | INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX); | |
1217 | if (test_bit(EV_SND, dev->evbit)) | |
1218 | INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX); | |
1219 | if (test_bit(EV_FF, dev->evbit)) | |
1220 | INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX); | |
1221 | if (test_bit(EV_SW, dev->evbit)) | |
1222 | INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); | |
1223 | ||
ac648a6a | 1224 | INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); |
a7fadbe1 DT |
1225 | |
1226 | return 0; | |
1227 | } | |
1228 | ||
9657d75c DT |
1229 | static struct device_type input_dev_type = { |
1230 | .groups = input_dev_attr_groups, | |
1231 | .release = input_dev_release, | |
1232 | .uevent = input_dev_uevent, | |
1233 | }; | |
1234 | ||
ea9f240b | 1235 | struct class input_class = { |
9657d75c | 1236 | .name = "input", |
d19fbe8a | 1237 | }; |
ca56fe07 | 1238 | EXPORT_SYMBOL_GPL(input_class); |
d19fbe8a | 1239 | |
1447190e DT |
1240 | /** |
1241 | * input_allocate_device - allocate memory for new input device | |
1242 | * | |
1243 | * Returns prepared struct input_dev or NULL. | |
1244 | * | |
1245 | * NOTE: Use input_free_device() to free devices that have not been | |
1246 | * registered; input_unregister_device() should be used for already | |
1247 | * registered devices. | |
1248 | */ | |
d19fbe8a DT |
1249 | struct input_dev *input_allocate_device(void) |
1250 | { | |
1251 | struct input_dev *dev; | |
1252 | ||
1253 | dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); | |
1254 | if (dev) { | |
9657d75c DT |
1255 | dev->dev.type = &input_dev_type; |
1256 | dev->dev.class = &input_class; | |
1257 | device_initialize(&dev->dev); | |
f60d2b11 | 1258 | mutex_init(&dev->mutex); |
8006479c | 1259 | spin_lock_init(&dev->event_lock); |
d19fbe8a DT |
1260 | INIT_LIST_HEAD(&dev->h_list); |
1261 | INIT_LIST_HEAD(&dev->node); | |
655816e4 DT |
1262 | |
1263 | __module_get(THIS_MODULE); | |
d19fbe8a DT |
1264 | } |
1265 | ||
1266 | return dev; | |
1267 | } | |
ca56fe07 | 1268 | EXPORT_SYMBOL(input_allocate_device); |
d19fbe8a | 1269 | |
1447190e DT |
1270 | /** |
1271 | * input_free_device - free memory occupied by input_dev structure | |
1272 | * @dev: input device to free | |
1273 | * | |
1274 | * This function should only be used if input_register_device() | |
1275 | * was not called yet or if it failed. Once device was registered | |
1276 | * use input_unregister_device() and memory will be freed once last | |
8006479c | 1277 | * reference to the device is dropped. |
1447190e DT |
1278 | * |
1279 | * Device should be allocated by input_allocate_device(). | |
1280 | * | |
1281 | * NOTE: If there are references to the input device then memory | |
1282 | * will not be freed until last reference is dropped. | |
1283 | */ | |
f60d2b11 DT |
1284 | void input_free_device(struct input_dev *dev) |
1285 | { | |
54f9e36c | 1286 | if (dev) |
f60d2b11 | 1287 | input_put_device(dev); |
f60d2b11 | 1288 | } |
ca56fe07 | 1289 | EXPORT_SYMBOL(input_free_device); |
f60d2b11 | 1290 | |
534565f2 DT |
1291 | /** |
1292 | * input_set_capability - mark device as capable of a certain event | |
1293 | * @dev: device that is capable of emitting or accepting event | |
1294 | * @type: type of the event (EV_KEY, EV_REL, etc...) | |
1295 | * @code: event code | |
1296 | * | |
1297 | * In addition to setting up corresponding bit in appropriate capability | |
1298 | * bitmap the function also adjusts dev->evbit. | |
1299 | */ | |
1300 | void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code) | |
1301 | { | |
1302 | switch (type) { | |
1303 | case EV_KEY: | |
1304 | __set_bit(code, dev->keybit); | |
1305 | break; | |
1306 | ||
1307 | case EV_REL: | |
1308 | __set_bit(code, dev->relbit); | |
1309 | break; | |
1310 | ||
1311 | case EV_ABS: | |
1312 | __set_bit(code, dev->absbit); | |
1313 | break; | |
1314 | ||
1315 | case EV_MSC: | |
1316 | __set_bit(code, dev->mscbit); | |
1317 | break; | |
1318 | ||
1319 | case EV_SW: | |
1320 | __set_bit(code, dev->swbit); | |
1321 | break; | |
1322 | ||
1323 | case EV_LED: | |
1324 | __set_bit(code, dev->ledbit); | |
1325 | break; | |
1326 | ||
1327 | case EV_SND: | |
1328 | __set_bit(code, dev->sndbit); | |
1329 | break; | |
1330 | ||
1331 | case EV_FF: | |
1332 | __set_bit(code, dev->ffbit); | |
1333 | break; | |
1334 | ||
22d1c398 DES |
1335 | case EV_PWR: |
1336 | /* do nothing */ | |
1337 | break; | |
1338 | ||
534565f2 DT |
1339 | default: |
1340 | printk(KERN_ERR | |
1341 | "input_set_capability: unknown type %u (code %u)\n", | |
1342 | type, code); | |
1343 | dump_stack(); | |
1344 | return; | |
1345 | } | |
1346 | ||
1347 | __set_bit(type, dev->evbit); | |
1348 | } | |
1349 | EXPORT_SYMBOL(input_set_capability); | |
1350 | ||
8006479c DT |
1351 | /** |
1352 | * input_register_device - register device with input core | |
1353 | * @dev: device to be registered | |
1354 | * | |
1355 | * This function registers device with input core. The device must be | |
1356 | * allocated with input_allocate_device() and all it's capabilities | |
1357 | * set up before registering. | |
1358 | * If function fails the device must be freed with input_free_device(). | |
1359 | * Once device has been successfully registered it can be unregistered | |
1360 | * with input_unregister_device(); input_free_device() should not be | |
1361 | * called in this case. | |
1362 | */ | |
5f945489 | 1363 | int input_register_device(struct input_dev *dev) |
1da177e4 | 1364 | { |
bd0ef235 | 1365 | static atomic_t input_no = ATOMIC_INIT(0); |
1da177e4 | 1366 | struct input_handler *handler; |
bd0ef235 DT |
1367 | const char *path; |
1368 | int error; | |
1da177e4 | 1369 | |
8006479c | 1370 | __set_bit(EV_SYN, dev->evbit); |
0fbf87ca | 1371 | |
1da177e4 LT |
1372 | /* |
1373 | * If delay and period are pre-set by the driver, then autorepeating | |
1374 | * is handled by the driver itself and we don't do it in input.c. | |
1375 | */ | |
1376 | ||
1377 | init_timer(&dev->timer); | |
1378 | if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { | |
1379 | dev->timer.data = (long) dev; | |
1380 | dev->timer.function = input_repeat_key; | |
1381 | dev->rep[REP_DELAY] = 250; | |
1382 | dev->rep[REP_PERIOD] = 33; | |
1383 | } | |
1384 | ||
c8e4c772 MR |
1385 | if (!dev->getkeycode) |
1386 | dev->getkeycode = input_default_getkeycode; | |
1387 | ||
1388 | if (!dev->setkeycode) | |
1389 | dev->setkeycode = input_default_setkeycode; | |
1390 | ||
9657d75c | 1391 | snprintf(dev->dev.bus_id, sizeof(dev->dev.bus_id), |
bd0ef235 DT |
1392 | "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1); |
1393 | ||
9657d75c | 1394 | error = device_add(&dev->dev); |
bd0ef235 DT |
1395 | if (error) |
1396 | return error; | |
1397 | ||
9657d75c | 1398 | path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
bd0ef235 DT |
1399 | printk(KERN_INFO "input: %s as %s\n", |
1400 | dev->name ? dev->name : "Unspecified device", path ? path : "N/A"); | |
1401 | kfree(path); | |
10204020 | 1402 | |
8006479c DT |
1403 | error = mutex_lock_interruptible(&input_mutex); |
1404 | if (error) { | |
1405 | device_del(&dev->dev); | |
1406 | return error; | |
1407 | } | |
1408 | ||
1409 | list_add_tail(&dev->node, &input_dev_list); | |
1410 | ||
1da177e4 | 1411 | list_for_each_entry(handler, &input_handler_list, node) |
5b2a0826 | 1412 | input_attach_handler(dev, handler); |
1da177e4 | 1413 | |
f96b434d | 1414 | input_wakeup_procfs_readers(); |
5f945489 | 1415 | |
8006479c DT |
1416 | mutex_unlock(&input_mutex); |
1417 | ||
5f945489 | 1418 | return 0; |
1da177e4 | 1419 | } |
ca56fe07 | 1420 | EXPORT_SYMBOL(input_register_device); |
1da177e4 | 1421 | |
8006479c DT |
1422 | /** |
1423 | * input_unregister_device - unregister previously registered device | |
1424 | * @dev: device to be unregistered | |
1425 | * | |
1426 | * This function unregisters an input device. Once device is unregistered | |
1427 | * the caller should not try to access it as it may get freed at any moment. | |
1428 | */ | |
1da177e4 LT |
1429 | void input_unregister_device(struct input_dev *dev) |
1430 | { | |
5b2a0826 | 1431 | struct input_handle *handle, *next; |
1da177e4 | 1432 | |
8006479c | 1433 | input_disconnect_device(dev); |
1da177e4 | 1434 | |
8006479c | 1435 | mutex_lock(&input_mutex); |
1da177e4 | 1436 | |
5b2a0826 | 1437 | list_for_each_entry_safe(handle, next, &dev->h_list, d_node) |
1da177e4 | 1438 | handle->handler->disconnect(handle); |
5b2a0826 | 1439 | WARN_ON(!list_empty(&dev->h_list)); |
1da177e4 | 1440 | |
8006479c | 1441 | del_timer_sync(&dev->timer); |
1da177e4 LT |
1442 | list_del_init(&dev->node); |
1443 | ||
f96b434d | 1444 | input_wakeup_procfs_readers(); |
8006479c DT |
1445 | |
1446 | mutex_unlock(&input_mutex); | |
1447 | ||
1448 | device_unregister(&dev->dev); | |
1da177e4 | 1449 | } |
ca56fe07 | 1450 | EXPORT_SYMBOL(input_unregister_device); |
1da177e4 | 1451 | |
8006479c DT |
1452 | /** |
1453 | * input_register_handler - register a new input handler | |
1454 | * @handler: handler to be registered | |
1455 | * | |
1456 | * This function registers a new input handler (interface) for input | |
1457 | * devices in the system and attaches it to all input devices that | |
1458 | * are compatible with the handler. | |
1459 | */ | |
4263cf0f | 1460 | int input_register_handler(struct input_handler *handler) |
1da177e4 LT |
1461 | { |
1462 | struct input_dev *dev; | |
8006479c DT |
1463 | int retval; |
1464 | ||
1465 | retval = mutex_lock_interruptible(&input_mutex); | |
1466 | if (retval) | |
1467 | return retval; | |
1da177e4 | 1468 | |
1da177e4 LT |
1469 | INIT_LIST_HEAD(&handler->h_list); |
1470 | ||
4263cf0f | 1471 | if (handler->fops != NULL) { |
8006479c DT |
1472 | if (input_table[handler->minor >> 5]) { |
1473 | retval = -EBUSY; | |
1474 | goto out; | |
1475 | } | |
1da177e4 | 1476 | input_table[handler->minor >> 5] = handler; |
4263cf0f | 1477 | } |
1da177e4 LT |
1478 | |
1479 | list_add_tail(&handler->node, &input_handler_list); | |
1480 | ||
1481 | list_for_each_entry(dev, &input_dev_list, node) | |
5b2a0826 | 1482 | input_attach_handler(dev, handler); |
1da177e4 | 1483 | |
f96b434d | 1484 | input_wakeup_procfs_readers(); |
8006479c DT |
1485 | |
1486 | out: | |
1487 | mutex_unlock(&input_mutex); | |
1488 | return retval; | |
1da177e4 | 1489 | } |
ca56fe07 | 1490 | EXPORT_SYMBOL(input_register_handler); |
1da177e4 | 1491 | |
8006479c DT |
1492 | /** |
1493 | * input_unregister_handler - unregisters an input handler | |
1494 | * @handler: handler to be unregistered | |
1495 | * | |
1496 | * This function disconnects a handler from its input devices and | |
1497 | * removes it from lists of known handlers. | |
1498 | */ | |
1da177e4 LT |
1499 | void input_unregister_handler(struct input_handler *handler) |
1500 | { | |
5b2a0826 | 1501 | struct input_handle *handle, *next; |
1da177e4 | 1502 | |
8006479c DT |
1503 | mutex_lock(&input_mutex); |
1504 | ||
5b2a0826 | 1505 | list_for_each_entry_safe(handle, next, &handler->h_list, h_node) |
1da177e4 | 1506 | handler->disconnect(handle); |
5b2a0826 | 1507 | WARN_ON(!list_empty(&handler->h_list)); |
1da177e4 LT |
1508 | |
1509 | list_del_init(&handler->node); | |
1510 | ||
1511 | if (handler->fops != NULL) | |
1512 | input_table[handler->minor >> 5] = NULL; | |
1513 | ||
f96b434d | 1514 | input_wakeup_procfs_readers(); |
8006479c DT |
1515 | |
1516 | mutex_unlock(&input_mutex); | |
1da177e4 | 1517 | } |
ca56fe07 | 1518 | EXPORT_SYMBOL(input_unregister_handler); |
1da177e4 | 1519 | |
8006479c DT |
1520 | /** |
1521 | * input_register_handle - register a new input handle | |
1522 | * @handle: handle to register | |
1523 | * | |
1524 | * This function puts a new input handle onto device's | |
1525 | * and handler's lists so that events can flow through | |
1526 | * it once it is opened using input_open_device(). | |
1527 | * | |
1528 | * This function is supposed to be called from handler's | |
1529 | * connect() method. | |
1530 | */ | |
5b2a0826 DT |
1531 | int input_register_handle(struct input_handle *handle) |
1532 | { | |
1533 | struct input_handler *handler = handle->handler; | |
8006479c DT |
1534 | struct input_dev *dev = handle->dev; |
1535 | int error; | |
1536 | ||
1537 | /* | |
1538 | * We take dev->mutex here to prevent race with | |
1539 | * input_release_device(). | |
1540 | */ | |
1541 | error = mutex_lock_interruptible(&dev->mutex); | |
1542 | if (error) | |
1543 | return error; | |
1544 | list_add_tail_rcu(&handle->d_node, &dev->h_list); | |
1545 | mutex_unlock(&dev->mutex); | |
82ba56c2 | 1546 | synchronize_rcu(); |
5b2a0826 | 1547 | |
8006479c DT |
1548 | /* |
1549 | * Since we are supposed to be called from ->connect() | |
1550 | * which is mutually exclusive with ->disconnect() | |
1551 | * we can't be racing with input_unregister_handle() | |
1552 | * and so separate lock is not needed here. | |
1553 | */ | |
5b2a0826 DT |
1554 | list_add_tail(&handle->h_node, &handler->h_list); |
1555 | ||
1556 | if (handler->start) | |
1557 | handler->start(handle); | |
1558 | ||
1559 | return 0; | |
1560 | } | |
1561 | EXPORT_SYMBOL(input_register_handle); | |
1562 | ||
8006479c DT |
1563 | /** |
1564 | * input_unregister_handle - unregister an input handle | |
1565 | * @handle: handle to unregister | |
1566 | * | |
1567 | * This function removes input handle from device's | |
1568 | * and handler's lists. | |
1569 | * | |
1570 | * This function is supposed to be called from handler's | |
1571 | * disconnect() method. | |
1572 | */ | |
5b2a0826 DT |
1573 | void input_unregister_handle(struct input_handle *handle) |
1574 | { | |
8006479c DT |
1575 | struct input_dev *dev = handle->dev; |
1576 | ||
5b2a0826 | 1577 | list_del_init(&handle->h_node); |
8006479c DT |
1578 | |
1579 | /* | |
1580 | * Take dev->mutex to prevent race with input_release_device(). | |
1581 | */ | |
1582 | mutex_lock(&dev->mutex); | |
1583 | list_del_rcu(&handle->d_node); | |
1584 | mutex_unlock(&dev->mutex); | |
82ba56c2 | 1585 | synchronize_rcu(); |
5b2a0826 DT |
1586 | } |
1587 | EXPORT_SYMBOL(input_unregister_handle); | |
1588 | ||
1da177e4 LT |
1589 | static int input_open_file(struct inode *inode, struct file *file) |
1590 | { | |
1591 | struct input_handler *handler = input_table[iminor(inode) >> 5]; | |
99ac48f5 | 1592 | const struct file_operations *old_fops, *new_fops = NULL; |
1da177e4 LT |
1593 | int err; |
1594 | ||
1595 | /* No load-on-demand here? */ | |
1596 | if (!handler || !(new_fops = fops_get(handler->fops))) | |
1597 | return -ENODEV; | |
1598 | ||
1599 | /* | |
1600 | * That's _really_ odd. Usually NULL ->open means "nothing special", | |
1601 | * not "no device". Oh, well... | |
1602 | */ | |
1603 | if (!new_fops->open) { | |
1604 | fops_put(new_fops); | |
1605 | return -ENODEV; | |
1606 | } | |
1607 | old_fops = file->f_op; | |
1608 | file->f_op = new_fops; | |
1609 | ||
1610 | err = new_fops->open(inode, file); | |
1611 | ||
1612 | if (err) { | |
1613 | fops_put(file->f_op); | |
1614 | file->f_op = fops_get(old_fops); | |
1615 | } | |
1616 | fops_put(old_fops); | |
1617 | return err; | |
1618 | } | |
1619 | ||
2b8693c0 | 1620 | static const struct file_operations input_fops = { |
1da177e4 LT |
1621 | .owner = THIS_MODULE, |
1622 | .open = input_open_file, | |
1623 | }; | |
1624 | ||
f96b434d | 1625 | static int __init input_init(void) |
1da177e4 | 1626 | { |
f96b434d | 1627 | int err; |
1da177e4 | 1628 | |
ea9f240b | 1629 | err = class_register(&input_class); |
d19fbe8a DT |
1630 | if (err) { |
1631 | printk(KERN_ERR "input: unable to register input_dev class\n"); | |
1632 | return err; | |
1633 | } | |
1634 | ||
f96b434d DT |
1635 | err = input_proc_init(); |
1636 | if (err) | |
b0fdfebb | 1637 | goto fail1; |
1da177e4 | 1638 | |
f96b434d DT |
1639 | err = register_chrdev(INPUT_MAJOR, "input", &input_fops); |
1640 | if (err) { | |
1641 | printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR); | |
b0fdfebb | 1642 | goto fail2; |
1da177e4 | 1643 | } |
e334016f | 1644 | |
1da177e4 | 1645 | return 0; |
1da177e4 | 1646 | |
b0fdfebb | 1647 | fail2: input_proc_exit(); |
ea9f240b | 1648 | fail1: class_unregister(&input_class); |
f96b434d | 1649 | return err; |
1da177e4 LT |
1650 | } |
1651 | ||
1652 | static void __exit input_exit(void) | |
1653 | { | |
f96b434d | 1654 | input_proc_exit(); |
1da177e4 | 1655 | unregister_chrdev(INPUT_MAJOR, "input"); |
ea9f240b | 1656 | class_unregister(&input_class); |
1da177e4 LT |
1657 | } |
1658 | ||
1659 | subsys_initcall(input_init); | |
1660 | module_exit(input_exit); |