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> |
2edbf853 | 24 | #include <linux/smp_lock.h> |
1da177e4 LT |
25 | |
26 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>"); | |
27 | MODULE_DESCRIPTION("Input core"); | |
28 | MODULE_LICENSE("GPL"); | |
29 | ||
1da177e4 LT |
30 | #define INPUT_DEVICES 256 |
31 | ||
32 | static LIST_HEAD(input_dev_list); | |
33 | static LIST_HEAD(input_handler_list); | |
34 | ||
8006479c DT |
35 | /* |
36 | * input_mutex protects access to both input_dev_list and input_handler_list. | |
37 | * This also causes input_[un]register_device and input_[un]register_handler | |
38 | * be mutually exclusive which simplifies locking in drivers implementing | |
39 | * input handlers. | |
40 | */ | |
41 | static DEFINE_MUTEX(input_mutex); | |
42 | ||
1da177e4 LT |
43 | static struct input_handler *input_table[8]; |
44 | ||
8006479c DT |
45 | static inline int is_event_supported(unsigned int code, |
46 | unsigned long *bm, unsigned int max) | |
1da177e4 | 47 | { |
8006479c DT |
48 | return code <= max && test_bit(code, bm); |
49 | } | |
1da177e4 | 50 | |
8006479c DT |
51 | static int input_defuzz_abs_event(int value, int old_val, int fuzz) |
52 | { | |
53 | if (fuzz) { | |
54 | if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2) | |
55 | return old_val; | |
1da177e4 | 56 | |
8006479c DT |
57 | if (value > old_val - fuzz && value < old_val + fuzz) |
58 | return (old_val * 3 + value) / 4; | |
1da177e4 | 59 | |
8006479c DT |
60 | if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2) |
61 | return (old_val + value) / 2; | |
62 | } | |
1da177e4 | 63 | |
8006479c DT |
64 | return value; |
65 | } | |
1da177e4 | 66 | |
8006479c DT |
67 | /* |
68 | * Pass event through all open handles. This function is called with | |
82ba56c2 | 69 | * dev->event_lock held and interrupts disabled. |
8006479c DT |
70 | */ |
71 | static void input_pass_event(struct input_dev *dev, | |
72 | unsigned int type, unsigned int code, int value) | |
73 | { | |
82ba56c2 DT |
74 | struct input_handle *handle; |
75 | ||
76 | rcu_read_lock(); | |
1da177e4 | 77 | |
82ba56c2 | 78 | handle = rcu_dereference(dev->grab); |
8006479c DT |
79 | if (handle) |
80 | handle->handler->event(handle, type, code, value); | |
81 | else | |
82 | list_for_each_entry_rcu(handle, &dev->h_list, d_node) | |
83 | if (handle->open) | |
84 | handle->handler->event(handle, | |
85 | type, code, value); | |
82ba56c2 | 86 | rcu_read_unlock(); |
8006479c | 87 | } |
1da177e4 | 88 | |
8006479c DT |
89 | /* |
90 | * Generate software autorepeat event. Note that we take | |
91 | * dev->event_lock here to avoid racing with input_event | |
92 | * which may cause keys get "stuck". | |
93 | */ | |
94 | static void input_repeat_key(unsigned long data) | |
95 | { | |
96 | struct input_dev *dev = (void *) data; | |
97 | unsigned long flags; | |
1da177e4 | 98 | |
8006479c | 99 | spin_lock_irqsave(&dev->event_lock, flags); |
1da177e4 | 100 | |
8006479c DT |
101 | if (test_bit(dev->repeat_key, dev->key) && |
102 | is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) { | |
1da177e4 | 103 | |
8006479c | 104 | input_pass_event(dev, EV_KEY, dev->repeat_key, 2); |
1da177e4 | 105 | |
8006479c DT |
106 | if (dev->sync) { |
107 | /* | |
108 | * Only send SYN_REPORT if we are not in a middle | |
109 | * of driver parsing a new hardware packet. | |
110 | * Otherwise assume that the driver will send | |
111 | * SYN_REPORT once it's done. | |
112 | */ | |
113 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
114 | } | |
31581066 | 115 | |
8006479c DT |
116 | if (dev->rep[REP_PERIOD]) |
117 | mod_timer(&dev->timer, jiffies + | |
118 | msecs_to_jiffies(dev->rep[REP_PERIOD])); | |
119 | } | |
31581066 | 120 | |
8006479c DT |
121 | spin_unlock_irqrestore(&dev->event_lock, flags); |
122 | } | |
31581066 | 123 | |
8006479c DT |
124 | static void input_start_autorepeat(struct input_dev *dev, int code) |
125 | { | |
126 | if (test_bit(EV_REP, dev->evbit) && | |
127 | dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && | |
128 | dev->timer.data) { | |
129 | dev->repeat_key = code; | |
130 | mod_timer(&dev->timer, | |
131 | jiffies + msecs_to_jiffies(dev->rep[REP_DELAY])); | |
132 | } | |
133 | } | |
31581066 | 134 | |
e7b5c1ef JB |
135 | static void input_stop_autorepeat(struct input_dev *dev) |
136 | { | |
137 | del_timer(&dev->timer); | |
138 | } | |
139 | ||
8006479c DT |
140 | #define INPUT_IGNORE_EVENT 0 |
141 | #define INPUT_PASS_TO_HANDLERS 1 | |
142 | #define INPUT_PASS_TO_DEVICE 2 | |
143 | #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE) | |
1da177e4 | 144 | |
8006479c DT |
145 | static void input_handle_event(struct input_dev *dev, |
146 | unsigned int type, unsigned int code, int value) | |
147 | { | |
148 | int disposition = INPUT_IGNORE_EVENT; | |
1da177e4 | 149 | |
8006479c | 150 | switch (type) { |
1da177e4 | 151 | |
8006479c DT |
152 | case EV_SYN: |
153 | switch (code) { | |
154 | case SYN_CONFIG: | |
155 | disposition = INPUT_PASS_TO_ALL; | |
156 | break; | |
1da177e4 | 157 | |
8006479c DT |
158 | case SYN_REPORT: |
159 | if (!dev->sync) { | |
160 | dev->sync = 1; | |
161 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 162 | } |
1da177e4 | 163 | break; |
8006479c DT |
164 | } |
165 | break; | |
1da177e4 | 166 | |
8006479c DT |
167 | case EV_KEY: |
168 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
169 | !!test_bit(code, dev->key) != value) { | |
1da177e4 | 170 | |
8006479c DT |
171 | if (value != 2) { |
172 | __change_bit(code, dev->key); | |
173 | if (value) | |
174 | input_start_autorepeat(dev, code); | |
e7b5c1ef JB |
175 | else |
176 | input_stop_autorepeat(dev); | |
8006479c | 177 | } |
1da177e4 | 178 | |
8006479c DT |
179 | disposition = INPUT_PASS_TO_HANDLERS; |
180 | } | |
181 | break; | |
1da177e4 | 182 | |
8006479c DT |
183 | case EV_SW: |
184 | if (is_event_supported(code, dev->swbit, SW_MAX) && | |
185 | !!test_bit(code, dev->sw) != value) { | |
1da177e4 | 186 | |
8006479c DT |
187 | __change_bit(code, dev->sw); |
188 | disposition = INPUT_PASS_TO_HANDLERS; | |
189 | } | |
190 | break; | |
1da177e4 | 191 | |
8006479c DT |
192 | case EV_ABS: |
193 | if (is_event_supported(code, dev->absbit, ABS_MAX)) { | |
1da177e4 | 194 | |
8006479c DT |
195 | value = input_defuzz_abs_event(value, |
196 | dev->abs[code], dev->absfuzz[code]); | |
1da177e4 | 197 | |
8006479c DT |
198 | if (dev->abs[code] != value) { |
199 | dev->abs[code] = value; | |
200 | disposition = INPUT_PASS_TO_HANDLERS; | |
201 | } | |
202 | } | |
203 | break; | |
1da177e4 | 204 | |
8006479c DT |
205 | case EV_REL: |
206 | if (is_event_supported(code, dev->relbit, REL_MAX) && value) | |
207 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 208 | |
8006479c | 209 | break; |
1e0afb28 | 210 | |
8006479c DT |
211 | case EV_MSC: |
212 | if (is_event_supported(code, dev->mscbit, MSC_MAX)) | |
213 | disposition = INPUT_PASS_TO_ALL; | |
1da177e4 | 214 | |
8006479c | 215 | break; |
1da177e4 | 216 | |
8006479c DT |
217 | case EV_LED: |
218 | if (is_event_supported(code, dev->ledbit, LED_MAX) && | |
219 | !!test_bit(code, dev->led) != value) { | |
1da177e4 | 220 | |
8006479c DT |
221 | __change_bit(code, dev->led); |
222 | disposition = INPUT_PASS_TO_ALL; | |
223 | } | |
224 | break; | |
225 | ||
226 | case EV_SND: | |
227 | if (is_event_supported(code, dev->sndbit, SND_MAX)) { | |
1da177e4 | 228 | |
8fdc1948 | 229 | if (!!test_bit(code, dev->snd) != !!value) |
8006479c DT |
230 | __change_bit(code, dev->snd); |
231 | disposition = INPUT_PASS_TO_ALL; | |
232 | } | |
233 | break; | |
8fdc1948 | 234 | |
8006479c DT |
235 | case EV_REP: |
236 | if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) { | |
237 | dev->rep[code] = value; | |
238 | disposition = INPUT_PASS_TO_ALL; | |
239 | } | |
240 | break; | |
1da177e4 | 241 | |
8006479c DT |
242 | case EV_FF: |
243 | if (value >= 0) | |
244 | disposition = INPUT_PASS_TO_ALL; | |
245 | break; | |
ed2fa4dd RP |
246 | |
247 | case EV_PWR: | |
248 | disposition = INPUT_PASS_TO_ALL; | |
249 | break; | |
8006479c | 250 | } |
1da177e4 | 251 | |
c9812282 | 252 | if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN) |
8006479c | 253 | dev->sync = 0; |
1da177e4 | 254 | |
8006479c DT |
255 | if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event) |
256 | dev->event(dev, type, code, value); | |
1da177e4 | 257 | |
8006479c DT |
258 | if (disposition & INPUT_PASS_TO_HANDLERS) |
259 | input_pass_event(dev, type, code, value); | |
260 | } | |
1da177e4 | 261 | |
8006479c DT |
262 | /** |
263 | * input_event() - report new input event | |
264 | * @dev: device that generated the event | |
265 | * @type: type of the event | |
266 | * @code: event code | |
267 | * @value: value of the event | |
268 | * | |
269 | * This function should be used by drivers implementing various input | |
270 | * devices. See also input_inject_event(). | |
271 | */ | |
1da177e4 | 272 | |
8006479c DT |
273 | void input_event(struct input_dev *dev, |
274 | unsigned int type, unsigned int code, int value) | |
275 | { | |
276 | unsigned long flags; | |
509ca1a9 | 277 | |
8006479c | 278 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
509ca1a9 | 279 | |
8006479c DT |
280 | spin_lock_irqsave(&dev->event_lock, flags); |
281 | add_input_randomness(type, code, value); | |
282 | input_handle_event(dev, type, code, value); | |
283 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1da177e4 | 284 | } |
1da177e4 | 285 | } |
ca56fe07 | 286 | EXPORT_SYMBOL(input_event); |
1da177e4 | 287 | |
0e739d28 DT |
288 | /** |
289 | * input_inject_event() - send input event from input handler | |
290 | * @handle: input handle to send event through | |
291 | * @type: type of the event | |
292 | * @code: event code | |
293 | * @value: value of the event | |
294 | * | |
8006479c DT |
295 | * Similar to input_event() but will ignore event if device is |
296 | * "grabbed" and handle injecting event is not the one that owns | |
297 | * the device. | |
0e739d28 | 298 | */ |
8006479c DT |
299 | void input_inject_event(struct input_handle *handle, |
300 | unsigned int type, unsigned int code, int value) | |
1da177e4 | 301 | { |
8006479c DT |
302 | struct input_dev *dev = handle->dev; |
303 | struct input_handle *grab; | |
304 | unsigned long flags; | |
1da177e4 | 305 | |
8006479c DT |
306 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
307 | spin_lock_irqsave(&dev->event_lock, flags); | |
1da177e4 | 308 | |
82ba56c2 | 309 | rcu_read_lock(); |
8006479c DT |
310 | grab = rcu_dereference(dev->grab); |
311 | if (!grab || grab == handle) | |
312 | input_handle_event(dev, type, code, value); | |
82ba56c2 | 313 | rcu_read_unlock(); |
1da177e4 | 314 | |
8006479c DT |
315 | spin_unlock_irqrestore(&dev->event_lock, flags); |
316 | } | |
1da177e4 | 317 | } |
8006479c | 318 | EXPORT_SYMBOL(input_inject_event); |
1da177e4 | 319 | |
8006479c DT |
320 | /** |
321 | * input_grab_device - grabs device for exclusive use | |
322 | * @handle: input handle that wants to own the device | |
323 | * | |
324 | * When a device is grabbed by an input handle all events generated by | |
325 | * the device are delivered only to this handle. Also events injected | |
326 | * by other input handles are ignored while device is grabbed. | |
327 | */ | |
1da177e4 LT |
328 | int input_grab_device(struct input_handle *handle) |
329 | { | |
8006479c DT |
330 | struct input_dev *dev = handle->dev; |
331 | int retval; | |
1da177e4 | 332 | |
8006479c DT |
333 | retval = mutex_lock_interruptible(&dev->mutex); |
334 | if (retval) | |
335 | return retval; | |
336 | ||
337 | if (dev->grab) { | |
338 | retval = -EBUSY; | |
339 | goto out; | |
340 | } | |
341 | ||
342 | rcu_assign_pointer(dev->grab, handle); | |
82ba56c2 | 343 | synchronize_rcu(); |
8006479c DT |
344 | |
345 | out: | |
346 | mutex_unlock(&dev->mutex); | |
347 | return retval; | |
1da177e4 | 348 | } |
ca56fe07 | 349 | EXPORT_SYMBOL(input_grab_device); |
1da177e4 | 350 | |
8006479c | 351 | static void __input_release_device(struct input_handle *handle) |
1da177e4 | 352 | { |
a2b2ed2c | 353 | struct input_dev *dev = handle->dev; |
c7e8dc6e | 354 | |
a2b2ed2c | 355 | if (dev->grab == handle) { |
8006479c DT |
356 | rcu_assign_pointer(dev->grab, NULL); |
357 | /* Make sure input_pass_event() notices that grab is gone */ | |
82ba56c2 | 358 | synchronize_rcu(); |
a2b2ed2c AM |
359 | |
360 | list_for_each_entry(handle, &dev->h_list, d_node) | |
8006479c | 361 | if (handle->open && handle->handler->start) |
c7e8dc6e DT |
362 | handle->handler->start(handle); |
363 | } | |
1da177e4 | 364 | } |
8006479c DT |
365 | |
366 | /** | |
367 | * input_release_device - release previously grabbed device | |
368 | * @handle: input handle that owns the device | |
369 | * | |
370 | * Releases previously grabbed device so that other input handles can | |
371 | * start receiving input events. Upon release all handlers attached | |
372 | * to the device have their start() method called so they have a change | |
373 | * to synchronize device state with the rest of the system. | |
374 | */ | |
375 | void input_release_device(struct input_handle *handle) | |
376 | { | |
377 | struct input_dev *dev = handle->dev; | |
378 | ||
379 | mutex_lock(&dev->mutex); | |
380 | __input_release_device(handle); | |
381 | mutex_unlock(&dev->mutex); | |
382 | } | |
ca56fe07 | 383 | EXPORT_SYMBOL(input_release_device); |
1da177e4 | 384 | |
8006479c DT |
385 | /** |
386 | * input_open_device - open input device | |
387 | * @handle: handle through which device is being accessed | |
388 | * | |
389 | * This function should be called by input handlers when they | |
390 | * want to start receive events from given input device. | |
391 | */ | |
1da177e4 LT |
392 | int input_open_device(struct input_handle *handle) |
393 | { | |
0fbf87ca | 394 | struct input_dev *dev = handle->dev; |
8006479c | 395 | int retval; |
0fbf87ca | 396 | |
8006479c DT |
397 | retval = mutex_lock_interruptible(&dev->mutex); |
398 | if (retval) | |
399 | return retval; | |
400 | ||
401 | if (dev->going_away) { | |
402 | retval = -ENODEV; | |
403 | goto out; | |
404 | } | |
0fbf87ca | 405 | |
1da177e4 | 406 | handle->open++; |
0fbf87ca DT |
407 | |
408 | if (!dev->users++ && dev->open) | |
8006479c DT |
409 | retval = dev->open(dev); |
410 | ||
411 | if (retval) { | |
412 | dev->users--; | |
413 | if (!--handle->open) { | |
414 | /* | |
415 | * Make sure we are not delivering any more events | |
416 | * through this handle | |
417 | */ | |
82ba56c2 | 418 | synchronize_rcu(); |
8006479c DT |
419 | } |
420 | } | |
0fbf87ca | 421 | |
8006479c | 422 | out: |
e676c232 | 423 | mutex_unlock(&dev->mutex); |
8006479c | 424 | return retval; |
1da177e4 | 425 | } |
ca56fe07 | 426 | EXPORT_SYMBOL(input_open_device); |
1da177e4 | 427 | |
8006479c | 428 | int input_flush_device(struct input_handle *handle, struct file *file) |
1da177e4 | 429 | { |
8006479c DT |
430 | struct input_dev *dev = handle->dev; |
431 | int retval; | |
1da177e4 | 432 | |
8006479c DT |
433 | retval = mutex_lock_interruptible(&dev->mutex); |
434 | if (retval) | |
435 | return retval; | |
436 | ||
437 | if (dev->flush) | |
438 | retval = dev->flush(dev, file); | |
439 | ||
440 | mutex_unlock(&dev->mutex); | |
441 | return retval; | |
1da177e4 | 442 | } |
ca56fe07 | 443 | EXPORT_SYMBOL(input_flush_device); |
1da177e4 | 444 | |
8006479c DT |
445 | /** |
446 | * input_close_device - close input device | |
447 | * @handle: handle through which device is being accessed | |
448 | * | |
449 | * This function should be called by input handlers when they | |
450 | * want to stop receive events from given input device. | |
451 | */ | |
1da177e4 LT |
452 | void input_close_device(struct input_handle *handle) |
453 | { | |
0fbf87ca DT |
454 | struct input_dev *dev = handle->dev; |
455 | ||
e676c232 | 456 | mutex_lock(&dev->mutex); |
0fbf87ca | 457 | |
8006479c DT |
458 | __input_release_device(handle); |
459 | ||
0fbf87ca DT |
460 | if (!--dev->users && dev->close) |
461 | dev->close(dev); | |
8006479c DT |
462 | |
463 | if (!--handle->open) { | |
464 | /* | |
82ba56c2 | 465 | * synchronize_rcu() makes sure that input_pass_event() |
8006479c DT |
466 | * completed and that no more input events are delivered |
467 | * through this handle | |
468 | */ | |
82ba56c2 | 469 | synchronize_rcu(); |
8006479c | 470 | } |
0fbf87ca | 471 | |
e676c232 | 472 | mutex_unlock(&dev->mutex); |
1da177e4 | 473 | } |
ca56fe07 | 474 | EXPORT_SYMBOL(input_close_device); |
1da177e4 | 475 | |
8006479c DT |
476 | /* |
477 | * Prepare device for unregistering | |
478 | */ | |
479 | static void input_disconnect_device(struct input_dev *dev) | |
480 | { | |
481 | struct input_handle *handle; | |
482 | int code; | |
483 | ||
484 | /* | |
485 | * Mark device as going away. Note that we take dev->mutex here | |
486 | * not to protect access to dev->going_away but rather to ensure | |
487 | * that there are no threads in the middle of input_open_device() | |
488 | */ | |
489 | mutex_lock(&dev->mutex); | |
490 | dev->going_away = 1; | |
491 | mutex_unlock(&dev->mutex); | |
492 | ||
493 | spin_lock_irq(&dev->event_lock); | |
494 | ||
495 | /* | |
496 | * Simulate keyup events for all pressed keys so that handlers | |
497 | * are not left with "stuck" keys. The driver may continue | |
498 | * generate events even after we done here but they will not | |
499 | * reach any handlers. | |
500 | */ | |
501 | if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) { | |
502 | for (code = 0; code <= KEY_MAX; code++) { | |
503 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
f4f37c8e | 504 | __test_and_clear_bit(code, dev->key)) { |
8006479c DT |
505 | input_pass_event(dev, EV_KEY, code, 0); |
506 | } | |
507 | } | |
508 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
509 | } | |
510 | ||
511 | list_for_each_entry(handle, &dev->h_list, d_node) | |
512 | handle->open = 0; | |
513 | ||
514 | spin_unlock_irq(&dev->event_lock); | |
515 | } | |
516 | ||
c8e4c772 MR |
517 | static int input_fetch_keycode(struct input_dev *dev, int scancode) |
518 | { | |
519 | switch (dev->keycodesize) { | |
520 | case 1: | |
521 | return ((u8 *)dev->keycode)[scancode]; | |
522 | ||
523 | case 2: | |
524 | return ((u16 *)dev->keycode)[scancode]; | |
525 | ||
526 | default: | |
527 | return ((u32 *)dev->keycode)[scancode]; | |
528 | } | |
529 | } | |
530 | ||
531 | static int input_default_getkeycode(struct input_dev *dev, | |
532 | int scancode, int *keycode) | |
533 | { | |
534 | if (!dev->keycodesize) | |
535 | return -EINVAL; | |
536 | ||
f4f37c8e | 537 | if (scancode >= dev->keycodemax) |
c8e4c772 MR |
538 | return -EINVAL; |
539 | ||
540 | *keycode = input_fetch_keycode(dev, scancode); | |
541 | ||
542 | return 0; | |
543 | } | |
544 | ||
545 | static int input_default_setkeycode(struct input_dev *dev, | |
546 | int scancode, int keycode) | |
547 | { | |
548 | int old_keycode; | |
549 | int i; | |
550 | ||
f4f37c8e | 551 | if (scancode >= dev->keycodemax) |
c8e4c772 MR |
552 | return -EINVAL; |
553 | ||
554 | if (!dev->keycodesize) | |
555 | return -EINVAL; | |
556 | ||
557 | if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8))) | |
558 | return -EINVAL; | |
559 | ||
560 | switch (dev->keycodesize) { | |
561 | case 1: { | |
562 | u8 *k = (u8 *)dev->keycode; | |
563 | old_keycode = k[scancode]; | |
564 | k[scancode] = keycode; | |
565 | break; | |
566 | } | |
567 | case 2: { | |
568 | u16 *k = (u16 *)dev->keycode; | |
569 | old_keycode = k[scancode]; | |
570 | k[scancode] = keycode; | |
571 | break; | |
572 | } | |
573 | default: { | |
574 | u32 *k = (u32 *)dev->keycode; | |
575 | old_keycode = k[scancode]; | |
576 | k[scancode] = keycode; | |
577 | break; | |
578 | } | |
579 | } | |
580 | ||
581 | clear_bit(old_keycode, dev->keybit); | |
582 | set_bit(keycode, dev->keybit); | |
583 | ||
584 | for (i = 0; i < dev->keycodemax; i++) { | |
585 | if (input_fetch_keycode(dev, i) == old_keycode) { | |
586 | set_bit(old_keycode, dev->keybit); | |
587 | break; /* Setting the bit twice is useless, so break */ | |
588 | } | |
589 | } | |
590 | ||
591 | return 0; | |
592 | } | |
593 | ||
f4f37c8e DT |
594 | /** |
595 | * input_get_keycode - retrieve keycode currently mapped to a given scancode | |
596 | * @dev: input device which keymap is being queried | |
597 | * @scancode: scancode (or its equivalent for device in question) for which | |
598 | * keycode is needed | |
599 | * @keycode: result | |
600 | * | |
601 | * This function should be called by anyone interested in retrieving current | |
602 | * keymap. Presently keyboard and evdev handlers use it. | |
603 | */ | |
604 | int input_get_keycode(struct input_dev *dev, int scancode, int *keycode) | |
605 | { | |
606 | if (scancode < 0) | |
607 | return -EINVAL; | |
608 | ||
609 | return dev->getkeycode(dev, scancode, keycode); | |
610 | } | |
611 | EXPORT_SYMBOL(input_get_keycode); | |
612 | ||
613 | /** | |
614 | * input_get_keycode - assign new keycode to a given scancode | |
615 | * @dev: input device which keymap is being updated | |
616 | * @scancode: scancode (or its equivalent for device in question) | |
617 | * @keycode: new keycode to be assigned to the scancode | |
618 | * | |
619 | * This function should be called by anyone needing to update current | |
620 | * keymap. Presently keyboard and evdev handlers use it. | |
621 | */ | |
622 | int input_set_keycode(struct input_dev *dev, int scancode, int keycode) | |
623 | { | |
624 | unsigned long flags; | |
625 | int old_keycode; | |
626 | int retval; | |
627 | ||
628 | if (scancode < 0) | |
629 | return -EINVAL; | |
630 | ||
631 | if (keycode < 0 || keycode > KEY_MAX) | |
632 | return -EINVAL; | |
633 | ||
634 | spin_lock_irqsave(&dev->event_lock, flags); | |
635 | ||
636 | retval = dev->getkeycode(dev, scancode, &old_keycode); | |
637 | if (retval) | |
638 | goto out; | |
639 | ||
640 | retval = dev->setkeycode(dev, scancode, keycode); | |
641 | if (retval) | |
642 | goto out; | |
643 | ||
644 | /* | |
645 | * Simulate keyup event if keycode is not present | |
646 | * in the keymap anymore | |
647 | */ | |
648 | if (test_bit(EV_KEY, dev->evbit) && | |
649 | !is_event_supported(old_keycode, dev->keybit, KEY_MAX) && | |
650 | __test_and_clear_bit(old_keycode, dev->key)) { | |
651 | ||
652 | input_pass_event(dev, EV_KEY, old_keycode, 0); | |
653 | if (dev->sync) | |
654 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
655 | } | |
656 | ||
657 | out: | |
658 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
659 | ||
660 | return retval; | |
661 | } | |
662 | EXPORT_SYMBOL(input_set_keycode); | |
c8e4c772 | 663 | |
1da177e4 | 664 | #define MATCH_BIT(bit, max) \ |
7b19ada2 | 665 | for (i = 0; i < BITS_TO_LONGS(max); i++) \ |
1da177e4 LT |
666 | if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \ |
667 | break; \ | |
7b19ada2 | 668 | if (i != BITS_TO_LONGS(max)) \ |
1da177e4 LT |
669 | continue; |
670 | ||
66e66118 DT |
671 | static const struct input_device_id *input_match_device(const struct input_device_id *id, |
672 | struct input_dev *dev) | |
1da177e4 LT |
673 | { |
674 | int i; | |
675 | ||
676 | for (; id->flags || id->driver_info; id++) { | |
677 | ||
678 | if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) | |
ddc5d341 | 679 | if (id->bustype != dev->id.bustype) |
1da177e4 LT |
680 | continue; |
681 | ||
682 | if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) | |
ddc5d341 | 683 | if (id->vendor != dev->id.vendor) |
1da177e4 LT |
684 | continue; |
685 | ||
686 | if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) | |
ddc5d341 | 687 | if (id->product != dev->id.product) |
1da177e4 LT |
688 | continue; |
689 | ||
690 | if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) | |
ddc5d341 | 691 | if (id->version != dev->id.version) |
1da177e4 LT |
692 | continue; |
693 | ||
694 | MATCH_BIT(evbit, EV_MAX); | |
695 | MATCH_BIT(keybit, KEY_MAX); | |
696 | MATCH_BIT(relbit, REL_MAX); | |
697 | MATCH_BIT(absbit, ABS_MAX); | |
698 | MATCH_BIT(mscbit, MSC_MAX); | |
699 | MATCH_BIT(ledbit, LED_MAX); | |
700 | MATCH_BIT(sndbit, SND_MAX); | |
701 | MATCH_BIT(ffbit, FF_MAX); | |
ff13f98b | 702 | MATCH_BIT(swbit, SW_MAX); |
1da177e4 LT |
703 | |
704 | return id; | |
705 | } | |
706 | ||
707 | return NULL; | |
708 | } | |
709 | ||
5b2a0826 DT |
710 | static int input_attach_handler(struct input_dev *dev, struct input_handler *handler) |
711 | { | |
712 | const struct input_device_id *id; | |
713 | int error; | |
714 | ||
715 | if (handler->blacklist && input_match_device(handler->blacklist, dev)) | |
716 | return -ENODEV; | |
717 | ||
718 | id = input_match_device(handler->id_table, dev); | |
719 | if (!id) | |
720 | return -ENODEV; | |
721 | ||
722 | error = handler->connect(handler, dev, id); | |
723 | if (error && error != -ENODEV) | |
724 | printk(KERN_ERR | |
725 | "input: failed to attach handler %s to device %s, " | |
726 | "error: %d\n", | |
9657d75c | 727 | handler->name, kobject_name(&dev->dev.kobj), error); |
5b2a0826 DT |
728 | |
729 | return error; | |
730 | } | |
731 | ||
732 | ||
f96b434d DT |
733 | #ifdef CONFIG_PROC_FS |
734 | ||
735 | static struct proc_dir_entry *proc_bus_input_dir; | |
736 | static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); | |
737 | static int input_devices_state; | |
738 | ||
739 | static inline void input_wakeup_procfs_readers(void) | |
740 | { | |
741 | input_devices_state++; | |
742 | wake_up(&input_devices_poll_wait); | |
743 | } | |
744 | ||
969b21cd | 745 | static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait) |
f96b434d | 746 | { |
f96b434d | 747 | poll_wait(file, &input_devices_poll_wait, wait); |
fa886612 DT |
748 | if (file->f_version != input_devices_state) { |
749 | file->f_version = input_devices_state; | |
f96b434d | 750 | return POLLIN | POLLRDNORM; |
fa886612 | 751 | } |
1e0afb28 | 752 | |
f96b434d DT |
753 | return 0; |
754 | } | |
755 | ||
969b21cd DT |
756 | static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) |
757 | { | |
8006479c DT |
758 | if (mutex_lock_interruptible(&input_mutex)) |
759 | return NULL; | |
f96b434d | 760 | |
ad5d972c | 761 | return seq_list_start(&input_dev_list, *pos); |
969b21cd | 762 | } |
051b2fea | 763 | |
969b21cd DT |
764 | static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
765 | { | |
ad5d972c | 766 | return seq_list_next(v, &input_dev_list, pos); |
969b21cd | 767 | } |
f96b434d | 768 | |
969b21cd DT |
769 | static void input_devices_seq_stop(struct seq_file *seq, void *v) |
770 | { | |
8006479c | 771 | mutex_unlock(&input_mutex); |
969b21cd | 772 | } |
f96b434d | 773 | |
969b21cd DT |
774 | static void input_seq_print_bitmap(struct seq_file *seq, const char *name, |
775 | unsigned long *bitmap, int max) | |
776 | { | |
777 | int i; | |
051b2fea | 778 | |
7b19ada2 | 779 | for (i = BITS_TO_LONGS(max) - 1; i > 0; i--) |
969b21cd DT |
780 | if (bitmap[i]) |
781 | break; | |
f96b434d | 782 | |
969b21cd DT |
783 | seq_printf(seq, "B: %s=", name); |
784 | for (; i >= 0; i--) | |
785 | seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : ""); | |
786 | seq_putc(seq, '\n'); | |
787 | } | |
f96b434d | 788 | |
969b21cd DT |
789 | static int input_devices_seq_show(struct seq_file *seq, void *v) |
790 | { | |
791 | struct input_dev *dev = container_of(v, struct input_dev, node); | |
9657d75c | 792 | const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
969b21cd DT |
793 | struct input_handle *handle; |
794 | ||
795 | seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", | |
796 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); | |
797 | ||
798 | seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); | |
799 | seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : ""); | |
800 | seq_printf(seq, "S: Sysfs=%s\n", path ? path : ""); | |
15e03ae8 | 801 | seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : ""); |
969b21cd DT |
802 | seq_printf(seq, "H: Handlers="); |
803 | ||
804 | list_for_each_entry(handle, &dev->h_list, d_node) | |
805 | seq_printf(seq, "%s ", handle->name); | |
806 | seq_putc(seq, '\n'); | |
807 | ||
808 | input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); | |
809 | if (test_bit(EV_KEY, dev->evbit)) | |
810 | input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); | |
811 | if (test_bit(EV_REL, dev->evbit)) | |
812 | input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); | |
813 | if (test_bit(EV_ABS, dev->evbit)) | |
814 | input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); | |
815 | if (test_bit(EV_MSC, dev->evbit)) | |
816 | input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); | |
817 | if (test_bit(EV_LED, dev->evbit)) | |
818 | input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); | |
819 | if (test_bit(EV_SND, dev->evbit)) | |
820 | input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); | |
821 | if (test_bit(EV_FF, dev->evbit)) | |
822 | input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); | |
823 | if (test_bit(EV_SW, dev->evbit)) | |
824 | input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); | |
825 | ||
826 | seq_putc(seq, '\n'); | |
827 | ||
828 | kfree(path); | |
829 | return 0; | |
f96b434d DT |
830 | } |
831 | ||
cec69c37 | 832 | static const struct seq_operations input_devices_seq_ops = { |
969b21cd DT |
833 | .start = input_devices_seq_start, |
834 | .next = input_devices_seq_next, | |
835 | .stop = input_devices_seq_stop, | |
836 | .show = input_devices_seq_show, | |
837 | }; | |
838 | ||
839 | static int input_proc_devices_open(struct inode *inode, struct file *file) | |
f96b434d | 840 | { |
969b21cd DT |
841 | return seq_open(file, &input_devices_seq_ops); |
842 | } | |
843 | ||
2b8693c0 | 844 | static const struct file_operations input_devices_fileops = { |
969b21cd DT |
845 | .owner = THIS_MODULE, |
846 | .open = input_proc_devices_open, | |
847 | .poll = input_proc_devices_poll, | |
848 | .read = seq_read, | |
849 | .llseek = seq_lseek, | |
850 | .release = seq_release, | |
851 | }; | |
852 | ||
853 | static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) | |
854 | { | |
8006479c DT |
855 | if (mutex_lock_interruptible(&input_mutex)) |
856 | return NULL; | |
857 | ||
969b21cd | 858 | seq->private = (void *)(unsigned long)*pos; |
ad5d972c | 859 | return seq_list_start(&input_handler_list, *pos); |
969b21cd | 860 | } |
f96b434d | 861 | |
969b21cd DT |
862 | static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
863 | { | |
864 | seq->private = (void *)(unsigned long)(*pos + 1); | |
ad5d972c | 865 | return seq_list_next(v, &input_handler_list, pos); |
f96b434d DT |
866 | } |
867 | ||
969b21cd DT |
868 | static void input_handlers_seq_stop(struct seq_file *seq, void *v) |
869 | { | |
8006479c | 870 | mutex_unlock(&input_mutex); |
969b21cd DT |
871 | } |
872 | ||
873 | static int input_handlers_seq_show(struct seq_file *seq, void *v) | |
874 | { | |
875 | struct input_handler *handler = container_of(v, struct input_handler, node); | |
876 | ||
877 | seq_printf(seq, "N: Number=%ld Name=%s", | |
878 | (unsigned long)seq->private, handler->name); | |
879 | if (handler->fops) | |
880 | seq_printf(seq, " Minor=%d", handler->minor); | |
881 | seq_putc(seq, '\n'); | |
882 | ||
883 | return 0; | |
884 | } | |
cec69c37 | 885 | static const struct seq_operations input_handlers_seq_ops = { |
969b21cd DT |
886 | .start = input_handlers_seq_start, |
887 | .next = input_handlers_seq_next, | |
888 | .stop = input_handlers_seq_stop, | |
889 | .show = input_handlers_seq_show, | |
890 | }; | |
891 | ||
892 | static int input_proc_handlers_open(struct inode *inode, struct file *file) | |
893 | { | |
894 | return seq_open(file, &input_handlers_seq_ops); | |
895 | } | |
896 | ||
2b8693c0 | 897 | static const struct file_operations input_handlers_fileops = { |
969b21cd DT |
898 | .owner = THIS_MODULE, |
899 | .open = input_proc_handlers_open, | |
900 | .read = seq_read, | |
901 | .llseek = seq_lseek, | |
902 | .release = seq_release, | |
903 | }; | |
f96b434d DT |
904 | |
905 | static int __init input_proc_init(void) | |
906 | { | |
907 | struct proc_dir_entry *entry; | |
908 | ||
9c37066d | 909 | proc_bus_input_dir = proc_mkdir("bus/input", NULL); |
f96b434d DT |
910 | if (!proc_bus_input_dir) |
911 | return -ENOMEM; | |
912 | ||
c7705f34 DL |
913 | entry = proc_create("devices", 0, proc_bus_input_dir, |
914 | &input_devices_fileops); | |
f96b434d DT |
915 | if (!entry) |
916 | goto fail1; | |
917 | ||
c7705f34 DL |
918 | entry = proc_create("handlers", 0, proc_bus_input_dir, |
919 | &input_handlers_fileops); | |
f96b434d DT |
920 | if (!entry) |
921 | goto fail2; | |
922 | ||
f96b434d DT |
923 | return 0; |
924 | ||
925 | fail2: remove_proc_entry("devices", proc_bus_input_dir); | |
9c37066d | 926 | fail1: remove_proc_entry("bus/input", NULL); |
f96b434d DT |
927 | return -ENOMEM; |
928 | } | |
929 | ||
beffbdc2 | 930 | static void input_proc_exit(void) |
f96b434d DT |
931 | { |
932 | remove_proc_entry("devices", proc_bus_input_dir); | |
933 | remove_proc_entry("handlers", proc_bus_input_dir); | |
9c37066d | 934 | remove_proc_entry("bus/input", NULL); |
f96b434d DT |
935 | } |
936 | ||
937 | #else /* !CONFIG_PROC_FS */ | |
938 | static inline void input_wakeup_procfs_readers(void) { } | |
939 | static inline int input_proc_init(void) { return 0; } | |
940 | static inline void input_proc_exit(void) { } | |
941 | #endif | |
942 | ||
9657d75c DT |
943 | #define INPUT_DEV_STRING_ATTR_SHOW(name) \ |
944 | static ssize_t input_dev_show_##name(struct device *dev, \ | |
945 | struct device_attribute *attr, \ | |
946 | char *buf) \ | |
947 | { \ | |
948 | struct input_dev *input_dev = to_input_dev(dev); \ | |
949 | \ | |
950 | return scnprintf(buf, PAGE_SIZE, "%s\n", \ | |
951 | input_dev->name ? input_dev->name : ""); \ | |
952 | } \ | |
953 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL) | |
5c1e9a6a DT |
954 | |
955 | INPUT_DEV_STRING_ATTR_SHOW(name); | |
956 | INPUT_DEV_STRING_ATTR_SHOW(phys); | |
957 | INPUT_DEV_STRING_ATTR_SHOW(uniq); | |
958 | ||
ac648a6a DT |
959 | static int input_print_modalias_bits(char *buf, int size, |
960 | char name, unsigned long *bm, | |
961 | unsigned int min_bit, unsigned int max_bit) | |
1d8f430c | 962 | { |
ac648a6a | 963 | int len = 0, i; |
1d8f430c | 964 | |
ac648a6a DT |
965 | len += snprintf(buf, max(size, 0), "%c", name); |
966 | for (i = min_bit; i < max_bit; i++) | |
7b19ada2 | 967 | if (bm[BIT_WORD(i)] & BIT_MASK(i)) |
ac648a6a | 968 | len += snprintf(buf + len, max(size - len, 0), "%X,", i); |
1d8f430c RR |
969 | return len; |
970 | } | |
971 | ||
2db66876 DT |
972 | static int input_print_modalias(char *buf, int size, struct input_dev *id, |
973 | int add_cr) | |
1d8f430c | 974 | { |
bd37e5a9 | 975 | int len; |
1d8f430c | 976 | |
ac648a6a DT |
977 | len = snprintf(buf, max(size, 0), |
978 | "input:b%04Xv%04Xp%04Xe%04X-", | |
979 | id->id.bustype, id->id.vendor, | |
980 | id->id.product, id->id.version); | |
981 | ||
982 | len += input_print_modalias_bits(buf + len, size - len, | |
983 | 'e', id->evbit, 0, EV_MAX); | |
984 | len += input_print_modalias_bits(buf + len, size - len, | |
985 | 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); | |
986 | len += input_print_modalias_bits(buf + len, size - len, | |
987 | 'r', id->relbit, 0, REL_MAX); | |
988 | len += input_print_modalias_bits(buf + len, size - len, | |
989 | 'a', id->absbit, 0, ABS_MAX); | |
990 | len += input_print_modalias_bits(buf + len, size - len, | |
991 | 'm', id->mscbit, 0, MSC_MAX); | |
992 | len += input_print_modalias_bits(buf + len, size - len, | |
993 | 'l', id->ledbit, 0, LED_MAX); | |
994 | len += input_print_modalias_bits(buf + len, size - len, | |
995 | 's', id->sndbit, 0, SND_MAX); | |
996 | len += input_print_modalias_bits(buf + len, size - len, | |
997 | 'f', id->ffbit, 0, FF_MAX); | |
998 | len += input_print_modalias_bits(buf + len, size - len, | |
999 | 'w', id->swbit, 0, SW_MAX); | |
2db66876 DT |
1000 | |
1001 | if (add_cr) | |
ac648a6a | 1002 | len += snprintf(buf + len, max(size - len, 0), "\n"); |
2db66876 | 1003 | |
bd37e5a9 KS |
1004 | return len; |
1005 | } | |
1006 | ||
9657d75c DT |
1007 | static ssize_t input_dev_show_modalias(struct device *dev, |
1008 | struct device_attribute *attr, | |
1009 | char *buf) | |
bd37e5a9 KS |
1010 | { |
1011 | struct input_dev *id = to_input_dev(dev); | |
1012 | ssize_t len; | |
1013 | ||
2db66876 DT |
1014 | len = input_print_modalias(buf, PAGE_SIZE, id, 1); |
1015 | ||
8a3cf456 | 1016 | return min_t(int, len, PAGE_SIZE); |
1d8f430c | 1017 | } |
9657d75c | 1018 | static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); |
1d8f430c | 1019 | |
629b77a4 | 1020 | static struct attribute *input_dev_attrs[] = { |
9657d75c DT |
1021 | &dev_attr_name.attr, |
1022 | &dev_attr_phys.attr, | |
1023 | &dev_attr_uniq.attr, | |
1024 | &dev_attr_modalias.attr, | |
629b77a4 GKH |
1025 | NULL |
1026 | }; | |
1027 | ||
bd0ef235 | 1028 | static struct attribute_group input_dev_attr_group = { |
629b77a4 | 1029 | .attrs = input_dev_attrs, |
5c1e9a6a DT |
1030 | }; |
1031 | ||
9657d75c DT |
1032 | #define INPUT_DEV_ID_ATTR(name) \ |
1033 | static ssize_t input_dev_show_id_##name(struct device *dev, \ | |
1034 | struct device_attribute *attr, \ | |
1035 | char *buf) \ | |
1036 | { \ | |
1037 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1038 | return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \ | |
1039 | } \ | |
1040 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL) | |
5c1e9a6a DT |
1041 | |
1042 | INPUT_DEV_ID_ATTR(bustype); | |
1043 | INPUT_DEV_ID_ATTR(vendor); | |
1044 | INPUT_DEV_ID_ATTR(product); | |
1045 | INPUT_DEV_ID_ATTR(version); | |
1046 | ||
1047 | static struct attribute *input_dev_id_attrs[] = { | |
9657d75c DT |
1048 | &dev_attr_bustype.attr, |
1049 | &dev_attr_vendor.attr, | |
1050 | &dev_attr_product.attr, | |
1051 | &dev_attr_version.attr, | |
5c1e9a6a DT |
1052 | NULL |
1053 | }; | |
1054 | ||
1055 | static struct attribute_group input_dev_id_attr_group = { | |
1056 | .name = "id", | |
1057 | .attrs = input_dev_id_attrs, | |
1058 | }; | |
1059 | ||
969b21cd DT |
1060 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1061 | int max, int add_cr) | |
1062 | { | |
1063 | int i; | |
1064 | int len = 0; | |
1065 | ||
7b19ada2 | 1066 | for (i = BITS_TO_LONGS(max) - 1; i > 0; i--) |
969b21cd DT |
1067 | if (bitmap[i]) |
1068 | break; | |
1069 | ||
1070 | for (; i >= 0; i--) | |
1071 | len += snprintf(buf + len, max(buf_size - len, 0), | |
1072 | "%lx%s", bitmap[i], i > 0 ? " " : ""); | |
1073 | ||
1074 | if (add_cr) | |
1075 | len += snprintf(buf + len, max(buf_size - len, 0), "\n"); | |
1076 | ||
1077 | return len; | |
1078 | } | |
1079 | ||
9657d75c DT |
1080 | #define INPUT_DEV_CAP_ATTR(ev, bm) \ |
1081 | static ssize_t input_dev_show_cap_##bm(struct device *dev, \ | |
1082 | struct device_attribute *attr, \ | |
1083 | char *buf) \ | |
1084 | { \ | |
1085 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1086 | int len = input_print_bitmap(buf, PAGE_SIZE, \ | |
1087 | input_dev->bm##bit, ev##_MAX, 1); \ | |
1088 | return min_t(int, len, PAGE_SIZE); \ | |
1089 | } \ | |
1090 | static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL) | |
5c1e9a6a DT |
1091 | |
1092 | INPUT_DEV_CAP_ATTR(EV, ev); | |
1093 | INPUT_DEV_CAP_ATTR(KEY, key); | |
1094 | INPUT_DEV_CAP_ATTR(REL, rel); | |
1095 | INPUT_DEV_CAP_ATTR(ABS, abs); | |
1096 | INPUT_DEV_CAP_ATTR(MSC, msc); | |
1097 | INPUT_DEV_CAP_ATTR(LED, led); | |
1098 | INPUT_DEV_CAP_ATTR(SND, snd); | |
1099 | INPUT_DEV_CAP_ATTR(FF, ff); | |
1100 | INPUT_DEV_CAP_ATTR(SW, sw); | |
1101 | ||
1102 | static struct attribute *input_dev_caps_attrs[] = { | |
9657d75c DT |
1103 | &dev_attr_ev.attr, |
1104 | &dev_attr_key.attr, | |
1105 | &dev_attr_rel.attr, | |
1106 | &dev_attr_abs.attr, | |
1107 | &dev_attr_msc.attr, | |
1108 | &dev_attr_led.attr, | |
1109 | &dev_attr_snd.attr, | |
1110 | &dev_attr_ff.attr, | |
1111 | &dev_attr_sw.attr, | |
5c1e9a6a DT |
1112 | NULL |
1113 | }; | |
1114 | ||
1115 | static struct attribute_group input_dev_caps_attr_group = { | |
1116 | .name = "capabilities", | |
1117 | .attrs = input_dev_caps_attrs, | |
1118 | }; | |
1119 | ||
cb9def4d DT |
1120 | static struct attribute_group *input_dev_attr_groups[] = { |
1121 | &input_dev_attr_group, | |
1122 | &input_dev_id_attr_group, | |
1123 | &input_dev_caps_attr_group, | |
1124 | NULL | |
1125 | }; | |
1126 | ||
9657d75c | 1127 | static void input_dev_release(struct device *device) |
d19fbe8a | 1128 | { |
9657d75c | 1129 | struct input_dev *dev = to_input_dev(device); |
d19fbe8a | 1130 | |
509ca1a9 | 1131 | input_ff_destroy(dev); |
d19fbe8a | 1132 | kfree(dev); |
509ca1a9 | 1133 | |
d19fbe8a DT |
1134 | module_put(THIS_MODULE); |
1135 | } | |
1136 | ||
a7fadbe1 | 1137 | /* |
312c004d | 1138 | * Input uevent interface - loading event handlers based on |
a7fadbe1 DT |
1139 | * device bitfields. |
1140 | */ | |
7eff2e7a | 1141 | static int input_add_uevent_bm_var(struct kobj_uevent_env *env, |
ac648a6a | 1142 | const char *name, unsigned long *bitmap, int max) |
a7fadbe1 | 1143 | { |
7eff2e7a | 1144 | int len; |
a7fadbe1 | 1145 | |
7eff2e7a | 1146 | if (add_uevent_var(env, "%s=", name)) |
a7fadbe1 DT |
1147 | return -ENOMEM; |
1148 | ||
7eff2e7a KS |
1149 | len = input_print_bitmap(&env->buf[env->buflen - 1], |
1150 | sizeof(env->buf) - env->buflen, | |
1151 | bitmap, max, 0); | |
1152 | if (len >= (sizeof(env->buf) - env->buflen)) | |
a7fadbe1 DT |
1153 | return -ENOMEM; |
1154 | ||
7eff2e7a | 1155 | env->buflen += len; |
a7fadbe1 DT |
1156 | return 0; |
1157 | } | |
1158 | ||
7eff2e7a | 1159 | static int input_add_uevent_modalias_var(struct kobj_uevent_env *env, |
ac648a6a DT |
1160 | struct input_dev *dev) |
1161 | { | |
7eff2e7a | 1162 | int len; |
ac648a6a | 1163 | |
7eff2e7a | 1164 | if (add_uevent_var(env, "MODALIAS=")) |
ac648a6a DT |
1165 | return -ENOMEM; |
1166 | ||
7eff2e7a KS |
1167 | len = input_print_modalias(&env->buf[env->buflen - 1], |
1168 | sizeof(env->buf) - env->buflen, | |
1169 | dev, 0); | |
1170 | if (len >= (sizeof(env->buf) - env->buflen)) | |
ac648a6a DT |
1171 | return -ENOMEM; |
1172 | ||
7eff2e7a | 1173 | env->buflen += len; |
ac648a6a DT |
1174 | return 0; |
1175 | } | |
1176 | ||
a7fadbe1 DT |
1177 | #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \ |
1178 | do { \ | |
7eff2e7a | 1179 | int err = add_uevent_var(env, fmt, val); \ |
a7fadbe1 DT |
1180 | if (err) \ |
1181 | return err; \ | |
1182 | } while (0) | |
1183 | ||
1184 | #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \ | |
1185 | do { \ | |
7eff2e7a | 1186 | int err = input_add_uevent_bm_var(env, name, bm, max); \ |
a7fadbe1 DT |
1187 | if (err) \ |
1188 | return err; \ | |
1189 | } while (0) | |
1190 | ||
ac648a6a DT |
1191 | #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \ |
1192 | do { \ | |
7eff2e7a | 1193 | int err = input_add_uevent_modalias_var(env, dev); \ |
ac648a6a DT |
1194 | if (err) \ |
1195 | return err; \ | |
1196 | } while (0) | |
1197 | ||
7eff2e7a | 1198 | static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env) |
a7fadbe1 | 1199 | { |
9657d75c | 1200 | struct input_dev *dev = to_input_dev(device); |
a7fadbe1 DT |
1201 | |
1202 | INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x", | |
1203 | dev->id.bustype, dev->id.vendor, | |
1204 | dev->id.product, dev->id.version); | |
1205 | if (dev->name) | |
1206 | INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); | |
1207 | if (dev->phys) | |
1208 | INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); | |
08de1f04 | 1209 | if (dev->uniq) |
a7fadbe1 DT |
1210 | INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); |
1211 | ||
1212 | INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX); | |
1213 | if (test_bit(EV_KEY, dev->evbit)) | |
1214 | INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX); | |
1215 | if (test_bit(EV_REL, dev->evbit)) | |
1216 | INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX); | |
1217 | if (test_bit(EV_ABS, dev->evbit)) | |
1218 | INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX); | |
1219 | if (test_bit(EV_MSC, dev->evbit)) | |
1220 | INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX); | |
1221 | if (test_bit(EV_LED, dev->evbit)) | |
1222 | INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX); | |
1223 | if (test_bit(EV_SND, dev->evbit)) | |
1224 | INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX); | |
1225 | if (test_bit(EV_FF, dev->evbit)) | |
1226 | INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX); | |
1227 | if (test_bit(EV_SW, dev->evbit)) | |
1228 | INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); | |
1229 | ||
ac648a6a | 1230 | INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); |
a7fadbe1 DT |
1231 | |
1232 | return 0; | |
1233 | } | |
1234 | ||
9657d75c DT |
1235 | static struct device_type input_dev_type = { |
1236 | .groups = input_dev_attr_groups, | |
1237 | .release = input_dev_release, | |
1238 | .uevent = input_dev_uevent, | |
1239 | }; | |
1240 | ||
ea9f240b | 1241 | struct class input_class = { |
9657d75c | 1242 | .name = "input", |
d19fbe8a | 1243 | }; |
ca56fe07 | 1244 | EXPORT_SYMBOL_GPL(input_class); |
d19fbe8a | 1245 | |
1447190e DT |
1246 | /** |
1247 | * input_allocate_device - allocate memory for new input device | |
1248 | * | |
1249 | * Returns prepared struct input_dev or NULL. | |
1250 | * | |
1251 | * NOTE: Use input_free_device() to free devices that have not been | |
1252 | * registered; input_unregister_device() should be used for already | |
1253 | * registered devices. | |
1254 | */ | |
d19fbe8a DT |
1255 | struct input_dev *input_allocate_device(void) |
1256 | { | |
1257 | struct input_dev *dev; | |
1258 | ||
1259 | dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); | |
1260 | if (dev) { | |
9657d75c DT |
1261 | dev->dev.type = &input_dev_type; |
1262 | dev->dev.class = &input_class; | |
1263 | device_initialize(&dev->dev); | |
f60d2b11 | 1264 | mutex_init(&dev->mutex); |
8006479c | 1265 | spin_lock_init(&dev->event_lock); |
d19fbe8a DT |
1266 | INIT_LIST_HEAD(&dev->h_list); |
1267 | INIT_LIST_HEAD(&dev->node); | |
655816e4 DT |
1268 | |
1269 | __module_get(THIS_MODULE); | |
d19fbe8a DT |
1270 | } |
1271 | ||
1272 | return dev; | |
1273 | } | |
ca56fe07 | 1274 | EXPORT_SYMBOL(input_allocate_device); |
d19fbe8a | 1275 | |
1447190e DT |
1276 | /** |
1277 | * input_free_device - free memory occupied by input_dev structure | |
1278 | * @dev: input device to free | |
1279 | * | |
1280 | * This function should only be used if input_register_device() | |
1281 | * was not called yet or if it failed. Once device was registered | |
1282 | * use input_unregister_device() and memory will be freed once last | |
8006479c | 1283 | * reference to the device is dropped. |
1447190e DT |
1284 | * |
1285 | * Device should be allocated by input_allocate_device(). | |
1286 | * | |
1287 | * NOTE: If there are references to the input device then memory | |
1288 | * will not be freed until last reference is dropped. | |
1289 | */ | |
f60d2b11 DT |
1290 | void input_free_device(struct input_dev *dev) |
1291 | { | |
54f9e36c | 1292 | if (dev) |
f60d2b11 | 1293 | input_put_device(dev); |
f60d2b11 | 1294 | } |
ca56fe07 | 1295 | EXPORT_SYMBOL(input_free_device); |
f60d2b11 | 1296 | |
534565f2 DT |
1297 | /** |
1298 | * input_set_capability - mark device as capable of a certain event | |
1299 | * @dev: device that is capable of emitting or accepting event | |
1300 | * @type: type of the event (EV_KEY, EV_REL, etc...) | |
1301 | * @code: event code | |
1302 | * | |
1303 | * In addition to setting up corresponding bit in appropriate capability | |
1304 | * bitmap the function also adjusts dev->evbit. | |
1305 | */ | |
1306 | void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code) | |
1307 | { | |
1308 | switch (type) { | |
1309 | case EV_KEY: | |
1310 | __set_bit(code, dev->keybit); | |
1311 | break; | |
1312 | ||
1313 | case EV_REL: | |
1314 | __set_bit(code, dev->relbit); | |
1315 | break; | |
1316 | ||
1317 | case EV_ABS: | |
1318 | __set_bit(code, dev->absbit); | |
1319 | break; | |
1320 | ||
1321 | case EV_MSC: | |
1322 | __set_bit(code, dev->mscbit); | |
1323 | break; | |
1324 | ||
1325 | case EV_SW: | |
1326 | __set_bit(code, dev->swbit); | |
1327 | break; | |
1328 | ||
1329 | case EV_LED: | |
1330 | __set_bit(code, dev->ledbit); | |
1331 | break; | |
1332 | ||
1333 | case EV_SND: | |
1334 | __set_bit(code, dev->sndbit); | |
1335 | break; | |
1336 | ||
1337 | case EV_FF: | |
1338 | __set_bit(code, dev->ffbit); | |
1339 | break; | |
1340 | ||
22d1c398 DB |
1341 | case EV_PWR: |
1342 | /* do nothing */ | |
1343 | break; | |
1344 | ||
534565f2 DT |
1345 | default: |
1346 | printk(KERN_ERR | |
1347 | "input_set_capability: unknown type %u (code %u)\n", | |
1348 | type, code); | |
1349 | dump_stack(); | |
1350 | return; | |
1351 | } | |
1352 | ||
1353 | __set_bit(type, dev->evbit); | |
1354 | } | |
1355 | EXPORT_SYMBOL(input_set_capability); | |
1356 | ||
8006479c DT |
1357 | /** |
1358 | * input_register_device - register device with input core | |
1359 | * @dev: device to be registered | |
1360 | * | |
1361 | * This function registers device with input core. The device must be | |
1362 | * allocated with input_allocate_device() and all it's capabilities | |
1363 | * set up before registering. | |
1364 | * If function fails the device must be freed with input_free_device(). | |
1365 | * Once device has been successfully registered it can be unregistered | |
1366 | * with input_unregister_device(); input_free_device() should not be | |
1367 | * called in this case. | |
1368 | */ | |
5f945489 | 1369 | int input_register_device(struct input_dev *dev) |
1da177e4 | 1370 | { |
bd0ef235 | 1371 | static atomic_t input_no = ATOMIC_INIT(0); |
1da177e4 | 1372 | struct input_handler *handler; |
bd0ef235 DT |
1373 | const char *path; |
1374 | int error; | |
1da177e4 | 1375 | |
8006479c | 1376 | __set_bit(EV_SYN, dev->evbit); |
0fbf87ca | 1377 | |
1da177e4 LT |
1378 | /* |
1379 | * If delay and period are pre-set by the driver, then autorepeating | |
1380 | * is handled by the driver itself and we don't do it in input.c. | |
1381 | */ | |
1382 | ||
1383 | init_timer(&dev->timer); | |
1384 | if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { | |
1385 | dev->timer.data = (long) dev; | |
1386 | dev->timer.function = input_repeat_key; | |
1387 | dev->rep[REP_DELAY] = 250; | |
1388 | dev->rep[REP_PERIOD] = 33; | |
1389 | } | |
1390 | ||
c8e4c772 MR |
1391 | if (!dev->getkeycode) |
1392 | dev->getkeycode = input_default_getkeycode; | |
1393 | ||
1394 | if (!dev->setkeycode) | |
1395 | dev->setkeycode = input_default_setkeycode; | |
1396 | ||
a6c2490f KS |
1397 | dev_set_name(&dev->dev, "input%ld", |
1398 | (unsigned long) atomic_inc_return(&input_no) - 1); | |
bd0ef235 | 1399 | |
9657d75c | 1400 | error = device_add(&dev->dev); |
bd0ef235 DT |
1401 | if (error) |
1402 | return error; | |
1403 | ||
9657d75c | 1404 | path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
bd0ef235 DT |
1405 | printk(KERN_INFO "input: %s as %s\n", |
1406 | dev->name ? dev->name : "Unspecified device", path ? path : "N/A"); | |
1407 | kfree(path); | |
10204020 | 1408 | |
8006479c DT |
1409 | error = mutex_lock_interruptible(&input_mutex); |
1410 | if (error) { | |
1411 | device_del(&dev->dev); | |
1412 | return error; | |
1413 | } | |
1414 | ||
1415 | list_add_tail(&dev->node, &input_dev_list); | |
1416 | ||
1da177e4 | 1417 | list_for_each_entry(handler, &input_handler_list, node) |
5b2a0826 | 1418 | input_attach_handler(dev, handler); |
1da177e4 | 1419 | |
f96b434d | 1420 | input_wakeup_procfs_readers(); |
5f945489 | 1421 | |
8006479c DT |
1422 | mutex_unlock(&input_mutex); |
1423 | ||
5f945489 | 1424 | return 0; |
1da177e4 | 1425 | } |
ca56fe07 | 1426 | EXPORT_SYMBOL(input_register_device); |
1da177e4 | 1427 | |
8006479c DT |
1428 | /** |
1429 | * input_unregister_device - unregister previously registered device | |
1430 | * @dev: device to be unregistered | |
1431 | * | |
1432 | * This function unregisters an input device. Once device is unregistered | |
1433 | * the caller should not try to access it as it may get freed at any moment. | |
1434 | */ | |
1da177e4 LT |
1435 | void input_unregister_device(struct input_dev *dev) |
1436 | { | |
5b2a0826 | 1437 | struct input_handle *handle, *next; |
1da177e4 | 1438 | |
8006479c | 1439 | input_disconnect_device(dev); |
1da177e4 | 1440 | |
8006479c | 1441 | mutex_lock(&input_mutex); |
1da177e4 | 1442 | |
5b2a0826 | 1443 | list_for_each_entry_safe(handle, next, &dev->h_list, d_node) |
1da177e4 | 1444 | handle->handler->disconnect(handle); |
5b2a0826 | 1445 | WARN_ON(!list_empty(&dev->h_list)); |
1da177e4 | 1446 | |
8006479c | 1447 | del_timer_sync(&dev->timer); |
1da177e4 LT |
1448 | list_del_init(&dev->node); |
1449 | ||
f96b434d | 1450 | input_wakeup_procfs_readers(); |
8006479c DT |
1451 | |
1452 | mutex_unlock(&input_mutex); | |
1453 | ||
1454 | device_unregister(&dev->dev); | |
1da177e4 | 1455 | } |
ca56fe07 | 1456 | EXPORT_SYMBOL(input_unregister_device); |
1da177e4 | 1457 | |
8006479c DT |
1458 | /** |
1459 | * input_register_handler - register a new input handler | |
1460 | * @handler: handler to be registered | |
1461 | * | |
1462 | * This function registers a new input handler (interface) for input | |
1463 | * devices in the system and attaches it to all input devices that | |
1464 | * are compatible with the handler. | |
1465 | */ | |
4263cf0f | 1466 | int input_register_handler(struct input_handler *handler) |
1da177e4 LT |
1467 | { |
1468 | struct input_dev *dev; | |
8006479c DT |
1469 | int retval; |
1470 | ||
1471 | retval = mutex_lock_interruptible(&input_mutex); | |
1472 | if (retval) | |
1473 | return retval; | |
1da177e4 | 1474 | |
1da177e4 LT |
1475 | INIT_LIST_HEAD(&handler->h_list); |
1476 | ||
4263cf0f | 1477 | if (handler->fops != NULL) { |
8006479c DT |
1478 | if (input_table[handler->minor >> 5]) { |
1479 | retval = -EBUSY; | |
1480 | goto out; | |
1481 | } | |
1da177e4 | 1482 | input_table[handler->minor >> 5] = handler; |
4263cf0f | 1483 | } |
1da177e4 LT |
1484 | |
1485 | list_add_tail(&handler->node, &input_handler_list); | |
1486 | ||
1487 | list_for_each_entry(dev, &input_dev_list, node) | |
5b2a0826 | 1488 | input_attach_handler(dev, handler); |
1da177e4 | 1489 | |
f96b434d | 1490 | input_wakeup_procfs_readers(); |
8006479c DT |
1491 | |
1492 | out: | |
1493 | mutex_unlock(&input_mutex); | |
1494 | return retval; | |
1da177e4 | 1495 | } |
ca56fe07 | 1496 | EXPORT_SYMBOL(input_register_handler); |
1da177e4 | 1497 | |
8006479c DT |
1498 | /** |
1499 | * input_unregister_handler - unregisters an input handler | |
1500 | * @handler: handler to be unregistered | |
1501 | * | |
1502 | * This function disconnects a handler from its input devices and | |
1503 | * removes it from lists of known handlers. | |
1504 | */ | |
1da177e4 LT |
1505 | void input_unregister_handler(struct input_handler *handler) |
1506 | { | |
5b2a0826 | 1507 | struct input_handle *handle, *next; |
1da177e4 | 1508 | |
8006479c DT |
1509 | mutex_lock(&input_mutex); |
1510 | ||
5b2a0826 | 1511 | list_for_each_entry_safe(handle, next, &handler->h_list, h_node) |
1da177e4 | 1512 | handler->disconnect(handle); |
5b2a0826 | 1513 | WARN_ON(!list_empty(&handler->h_list)); |
1da177e4 LT |
1514 | |
1515 | list_del_init(&handler->node); | |
1516 | ||
1517 | if (handler->fops != NULL) | |
1518 | input_table[handler->minor >> 5] = NULL; | |
1519 | ||
f96b434d | 1520 | input_wakeup_procfs_readers(); |
8006479c DT |
1521 | |
1522 | mutex_unlock(&input_mutex); | |
1da177e4 | 1523 | } |
ca56fe07 | 1524 | EXPORT_SYMBOL(input_unregister_handler); |
1da177e4 | 1525 | |
8006479c DT |
1526 | /** |
1527 | * input_register_handle - register a new input handle | |
1528 | * @handle: handle to register | |
1529 | * | |
1530 | * This function puts a new input handle onto device's | |
1531 | * and handler's lists so that events can flow through | |
1532 | * it once it is opened using input_open_device(). | |
1533 | * | |
1534 | * This function is supposed to be called from handler's | |
1535 | * connect() method. | |
1536 | */ | |
5b2a0826 DT |
1537 | int input_register_handle(struct input_handle *handle) |
1538 | { | |
1539 | struct input_handler *handler = handle->handler; | |
8006479c DT |
1540 | struct input_dev *dev = handle->dev; |
1541 | int error; | |
1542 | ||
1543 | /* | |
1544 | * We take dev->mutex here to prevent race with | |
1545 | * input_release_device(). | |
1546 | */ | |
1547 | error = mutex_lock_interruptible(&dev->mutex); | |
1548 | if (error) | |
1549 | return error; | |
1550 | list_add_tail_rcu(&handle->d_node, &dev->h_list); | |
1551 | mutex_unlock(&dev->mutex); | |
82ba56c2 | 1552 | synchronize_rcu(); |
5b2a0826 | 1553 | |
8006479c DT |
1554 | /* |
1555 | * Since we are supposed to be called from ->connect() | |
1556 | * which is mutually exclusive with ->disconnect() | |
1557 | * we can't be racing with input_unregister_handle() | |
1558 | * and so separate lock is not needed here. | |
1559 | */ | |
5b2a0826 DT |
1560 | list_add_tail(&handle->h_node, &handler->h_list); |
1561 | ||
1562 | if (handler->start) | |
1563 | handler->start(handle); | |
1564 | ||
1565 | return 0; | |
1566 | } | |
1567 | EXPORT_SYMBOL(input_register_handle); | |
1568 | ||
8006479c DT |
1569 | /** |
1570 | * input_unregister_handle - unregister an input handle | |
1571 | * @handle: handle to unregister | |
1572 | * | |
1573 | * This function removes input handle from device's | |
1574 | * and handler's lists. | |
1575 | * | |
1576 | * This function is supposed to be called from handler's | |
1577 | * disconnect() method. | |
1578 | */ | |
5b2a0826 DT |
1579 | void input_unregister_handle(struct input_handle *handle) |
1580 | { | |
8006479c DT |
1581 | struct input_dev *dev = handle->dev; |
1582 | ||
5b2a0826 | 1583 | list_del_init(&handle->h_node); |
8006479c DT |
1584 | |
1585 | /* | |
1586 | * Take dev->mutex to prevent race with input_release_device(). | |
1587 | */ | |
1588 | mutex_lock(&dev->mutex); | |
1589 | list_del_rcu(&handle->d_node); | |
1590 | mutex_unlock(&dev->mutex); | |
82ba56c2 | 1591 | synchronize_rcu(); |
5b2a0826 DT |
1592 | } |
1593 | EXPORT_SYMBOL(input_unregister_handle); | |
1594 | ||
1da177e4 LT |
1595 | static int input_open_file(struct inode *inode, struct file *file) |
1596 | { | |
2edbf853 | 1597 | struct input_handler *handler; |
99ac48f5 | 1598 | const struct file_operations *old_fops, *new_fops = NULL; |
1da177e4 LT |
1599 | int err; |
1600 | ||
2edbf853 | 1601 | lock_kernel(); |
1da177e4 | 1602 | /* No load-on-demand here? */ |
2edbf853 JC |
1603 | handler = input_table[iminor(inode) >> 5]; |
1604 | if (!handler || !(new_fops = fops_get(handler->fops))) { | |
1605 | err = -ENODEV; | |
1606 | goto out; | |
1607 | } | |
1da177e4 LT |
1608 | |
1609 | /* | |
1610 | * That's _really_ odd. Usually NULL ->open means "nothing special", | |
1611 | * not "no device". Oh, well... | |
1612 | */ | |
1613 | if (!new_fops->open) { | |
1614 | fops_put(new_fops); | |
2edbf853 JC |
1615 | err = -ENODEV; |
1616 | goto out; | |
1da177e4 LT |
1617 | } |
1618 | old_fops = file->f_op; | |
1619 | file->f_op = new_fops; | |
1620 | ||
1621 | err = new_fops->open(inode, file); | |
1622 | ||
1623 | if (err) { | |
1624 | fops_put(file->f_op); | |
1625 | file->f_op = fops_get(old_fops); | |
1626 | } | |
1627 | fops_put(old_fops); | |
2edbf853 JC |
1628 | out: |
1629 | unlock_kernel(); | |
1da177e4 LT |
1630 | return err; |
1631 | } | |
1632 | ||
2b8693c0 | 1633 | static const struct file_operations input_fops = { |
1da177e4 LT |
1634 | .owner = THIS_MODULE, |
1635 | .open = input_open_file, | |
1636 | }; | |
1637 | ||
f96b434d | 1638 | static int __init input_init(void) |
1da177e4 | 1639 | { |
f96b434d | 1640 | int err; |
1da177e4 | 1641 | |
ea9f240b | 1642 | err = class_register(&input_class); |
d19fbe8a DT |
1643 | if (err) { |
1644 | printk(KERN_ERR "input: unable to register input_dev class\n"); | |
1645 | return err; | |
1646 | } | |
1647 | ||
f96b434d DT |
1648 | err = input_proc_init(); |
1649 | if (err) | |
b0fdfebb | 1650 | goto fail1; |
1da177e4 | 1651 | |
f96b434d DT |
1652 | err = register_chrdev(INPUT_MAJOR, "input", &input_fops); |
1653 | if (err) { | |
1654 | printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR); | |
b0fdfebb | 1655 | goto fail2; |
1da177e4 | 1656 | } |
e334016f | 1657 | |
1da177e4 | 1658 | return 0; |
1da177e4 | 1659 | |
b0fdfebb | 1660 | fail2: input_proc_exit(); |
ea9f240b | 1661 | fail1: class_unregister(&input_class); |
f96b434d | 1662 | return err; |
1da177e4 LT |
1663 | } |
1664 | ||
1665 | static void __exit input_exit(void) | |
1666 | { | |
f96b434d | 1667 | input_proc_exit(); |
1da177e4 | 1668 | unregister_chrdev(INPUT_MAJOR, "input"); |
ea9f240b | 1669 | class_unregister(&input_class); |
1da177e4 LT |
1670 | } |
1671 | ||
1672 | subsys_initcall(input_init); | |
1673 | module_exit(input_exit); |