]>
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 | ||
61994a61 HR |
32 | /* |
33 | * EV_ABS events which should not be cached are listed here. | |
34 | */ | |
35 | static unsigned int input_abs_bypass_init_data[] __initdata = { | |
5e5ee686 HR |
36 | ABS_MT_TOUCH_MAJOR, |
37 | ABS_MT_TOUCH_MINOR, | |
38 | ABS_MT_WIDTH_MAJOR, | |
39 | ABS_MT_WIDTH_MINOR, | |
40 | ABS_MT_ORIENTATION, | |
41 | ABS_MT_POSITION_X, | |
42 | ABS_MT_POSITION_Y, | |
43 | ABS_MT_TOOL_TYPE, | |
44 | ABS_MT_BLOB_ID, | |
61994a61 HR |
45 | 0 |
46 | }; | |
47 | static unsigned long input_abs_bypass[BITS_TO_LONGS(ABS_CNT)]; | |
48 | ||
1da177e4 LT |
49 | static LIST_HEAD(input_dev_list); |
50 | static LIST_HEAD(input_handler_list); | |
51 | ||
8006479c DT |
52 | /* |
53 | * input_mutex protects access to both input_dev_list and input_handler_list. | |
54 | * This also causes input_[un]register_device and input_[un]register_handler | |
55 | * be mutually exclusive which simplifies locking in drivers implementing | |
56 | * input handlers. | |
57 | */ | |
58 | static DEFINE_MUTEX(input_mutex); | |
59 | ||
1da177e4 LT |
60 | static struct input_handler *input_table[8]; |
61 | ||
8006479c DT |
62 | static inline int is_event_supported(unsigned int code, |
63 | unsigned long *bm, unsigned int max) | |
1da177e4 | 64 | { |
8006479c DT |
65 | return code <= max && test_bit(code, bm); |
66 | } | |
1da177e4 | 67 | |
8006479c DT |
68 | static int input_defuzz_abs_event(int value, int old_val, int fuzz) |
69 | { | |
70 | if (fuzz) { | |
71 | if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2) | |
72 | return old_val; | |
1da177e4 | 73 | |
8006479c DT |
74 | if (value > old_val - fuzz && value < old_val + fuzz) |
75 | return (old_val * 3 + value) / 4; | |
1da177e4 | 76 | |
8006479c DT |
77 | if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2) |
78 | return (old_val + value) / 2; | |
79 | } | |
1da177e4 | 80 | |
8006479c DT |
81 | return value; |
82 | } | |
1da177e4 | 83 | |
8006479c DT |
84 | /* |
85 | * Pass event through all open handles. This function is called with | |
82ba56c2 | 86 | * dev->event_lock held and interrupts disabled. |
8006479c DT |
87 | */ |
88 | static void input_pass_event(struct input_dev *dev, | |
89 | unsigned int type, unsigned int code, int value) | |
90 | { | |
82ba56c2 DT |
91 | struct input_handle *handle; |
92 | ||
93 | rcu_read_lock(); | |
1da177e4 | 94 | |
82ba56c2 | 95 | handle = rcu_dereference(dev->grab); |
8006479c DT |
96 | if (handle) |
97 | handle->handler->event(handle, type, code, value); | |
98 | else | |
99 | list_for_each_entry_rcu(handle, &dev->h_list, d_node) | |
100 | if (handle->open) | |
101 | handle->handler->event(handle, | |
102 | type, code, value); | |
82ba56c2 | 103 | rcu_read_unlock(); |
8006479c | 104 | } |
1da177e4 | 105 | |
8006479c DT |
106 | /* |
107 | * Generate software autorepeat event. Note that we take | |
108 | * dev->event_lock here to avoid racing with input_event | |
109 | * which may cause keys get "stuck". | |
110 | */ | |
111 | static void input_repeat_key(unsigned long data) | |
112 | { | |
113 | struct input_dev *dev = (void *) data; | |
114 | unsigned long flags; | |
1da177e4 | 115 | |
8006479c | 116 | spin_lock_irqsave(&dev->event_lock, flags); |
1da177e4 | 117 | |
8006479c DT |
118 | if (test_bit(dev->repeat_key, dev->key) && |
119 | is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) { | |
1da177e4 | 120 | |
8006479c | 121 | input_pass_event(dev, EV_KEY, dev->repeat_key, 2); |
1da177e4 | 122 | |
8006479c DT |
123 | if (dev->sync) { |
124 | /* | |
125 | * Only send SYN_REPORT if we are not in a middle | |
126 | * of driver parsing a new hardware packet. | |
127 | * Otherwise assume that the driver will send | |
128 | * SYN_REPORT once it's done. | |
129 | */ | |
130 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
131 | } | |
31581066 | 132 | |
8006479c DT |
133 | if (dev->rep[REP_PERIOD]) |
134 | mod_timer(&dev->timer, jiffies + | |
135 | msecs_to_jiffies(dev->rep[REP_PERIOD])); | |
136 | } | |
31581066 | 137 | |
8006479c DT |
138 | spin_unlock_irqrestore(&dev->event_lock, flags); |
139 | } | |
31581066 | 140 | |
8006479c DT |
141 | static void input_start_autorepeat(struct input_dev *dev, int code) |
142 | { | |
143 | if (test_bit(EV_REP, dev->evbit) && | |
144 | dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && | |
145 | dev->timer.data) { | |
146 | dev->repeat_key = code; | |
147 | mod_timer(&dev->timer, | |
148 | jiffies + msecs_to_jiffies(dev->rep[REP_DELAY])); | |
149 | } | |
150 | } | |
31581066 | 151 | |
e7b5c1ef JB |
152 | static void input_stop_autorepeat(struct input_dev *dev) |
153 | { | |
154 | del_timer(&dev->timer); | |
155 | } | |
156 | ||
8006479c DT |
157 | #define INPUT_IGNORE_EVENT 0 |
158 | #define INPUT_PASS_TO_HANDLERS 1 | |
159 | #define INPUT_PASS_TO_DEVICE 2 | |
160 | #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE) | |
1da177e4 | 161 | |
8006479c DT |
162 | static void input_handle_event(struct input_dev *dev, |
163 | unsigned int type, unsigned int code, int value) | |
164 | { | |
165 | int disposition = INPUT_IGNORE_EVENT; | |
1da177e4 | 166 | |
8006479c | 167 | switch (type) { |
1da177e4 | 168 | |
8006479c DT |
169 | case EV_SYN: |
170 | switch (code) { | |
171 | case SYN_CONFIG: | |
172 | disposition = INPUT_PASS_TO_ALL; | |
173 | break; | |
1da177e4 | 174 | |
8006479c DT |
175 | case SYN_REPORT: |
176 | if (!dev->sync) { | |
177 | dev->sync = 1; | |
178 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 179 | } |
1da177e4 | 180 | break; |
5e5ee686 HR |
181 | case SYN_MT_REPORT: |
182 | dev->sync = 0; | |
183 | disposition = INPUT_PASS_TO_HANDLERS; | |
184 | break; | |
8006479c DT |
185 | } |
186 | break; | |
1da177e4 | 187 | |
8006479c DT |
188 | case EV_KEY: |
189 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
190 | !!test_bit(code, dev->key) != value) { | |
1da177e4 | 191 | |
8006479c DT |
192 | if (value != 2) { |
193 | __change_bit(code, dev->key); | |
194 | if (value) | |
195 | input_start_autorepeat(dev, code); | |
e7b5c1ef JB |
196 | else |
197 | input_stop_autorepeat(dev); | |
8006479c | 198 | } |
1da177e4 | 199 | |
8006479c DT |
200 | disposition = INPUT_PASS_TO_HANDLERS; |
201 | } | |
202 | break; | |
1da177e4 | 203 | |
8006479c DT |
204 | case EV_SW: |
205 | if (is_event_supported(code, dev->swbit, SW_MAX) && | |
206 | !!test_bit(code, dev->sw) != value) { | |
1da177e4 | 207 | |
8006479c DT |
208 | __change_bit(code, dev->sw); |
209 | disposition = INPUT_PASS_TO_HANDLERS; | |
210 | } | |
211 | break; | |
1da177e4 | 212 | |
8006479c DT |
213 | case EV_ABS: |
214 | if (is_event_supported(code, dev->absbit, ABS_MAX)) { | |
1da177e4 | 215 | |
61994a61 HR |
216 | if (test_bit(code, input_abs_bypass)) { |
217 | disposition = INPUT_PASS_TO_HANDLERS; | |
218 | break; | |
219 | } | |
220 | ||
8006479c DT |
221 | value = input_defuzz_abs_event(value, |
222 | dev->abs[code], dev->absfuzz[code]); | |
1da177e4 | 223 | |
8006479c DT |
224 | if (dev->abs[code] != value) { |
225 | dev->abs[code] = value; | |
226 | disposition = INPUT_PASS_TO_HANDLERS; | |
227 | } | |
228 | } | |
229 | break; | |
1da177e4 | 230 | |
8006479c DT |
231 | case EV_REL: |
232 | if (is_event_supported(code, dev->relbit, REL_MAX) && value) | |
233 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 234 | |
8006479c | 235 | break; |
1e0afb28 | 236 | |
8006479c DT |
237 | case EV_MSC: |
238 | if (is_event_supported(code, dev->mscbit, MSC_MAX)) | |
239 | disposition = INPUT_PASS_TO_ALL; | |
1da177e4 | 240 | |
8006479c | 241 | break; |
1da177e4 | 242 | |
8006479c DT |
243 | case EV_LED: |
244 | if (is_event_supported(code, dev->ledbit, LED_MAX) && | |
245 | !!test_bit(code, dev->led) != value) { | |
1da177e4 | 246 | |
8006479c DT |
247 | __change_bit(code, dev->led); |
248 | disposition = INPUT_PASS_TO_ALL; | |
249 | } | |
250 | break; | |
251 | ||
252 | case EV_SND: | |
253 | if (is_event_supported(code, dev->sndbit, SND_MAX)) { | |
1da177e4 | 254 | |
8fdc1948 | 255 | if (!!test_bit(code, dev->snd) != !!value) |
8006479c DT |
256 | __change_bit(code, dev->snd); |
257 | disposition = INPUT_PASS_TO_ALL; | |
258 | } | |
259 | break; | |
8fdc1948 | 260 | |
8006479c DT |
261 | case EV_REP: |
262 | if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) { | |
263 | dev->rep[code] = value; | |
264 | disposition = INPUT_PASS_TO_ALL; | |
265 | } | |
266 | break; | |
1da177e4 | 267 | |
8006479c DT |
268 | case EV_FF: |
269 | if (value >= 0) | |
270 | disposition = INPUT_PASS_TO_ALL; | |
271 | break; | |
ed2fa4dd RP |
272 | |
273 | case EV_PWR: | |
274 | disposition = INPUT_PASS_TO_ALL; | |
275 | break; | |
8006479c | 276 | } |
1da177e4 | 277 | |
c9812282 | 278 | if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN) |
8006479c | 279 | dev->sync = 0; |
1da177e4 | 280 | |
8006479c DT |
281 | if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event) |
282 | dev->event(dev, type, code, value); | |
1da177e4 | 283 | |
8006479c DT |
284 | if (disposition & INPUT_PASS_TO_HANDLERS) |
285 | input_pass_event(dev, type, code, value); | |
286 | } | |
1da177e4 | 287 | |
8006479c DT |
288 | /** |
289 | * input_event() - report new input event | |
290 | * @dev: device that generated the event | |
291 | * @type: type of the event | |
292 | * @code: event code | |
293 | * @value: value of the event | |
294 | * | |
295 | * This function should be used by drivers implementing various input | |
296 | * devices. See also input_inject_event(). | |
297 | */ | |
1da177e4 | 298 | |
8006479c DT |
299 | void input_event(struct input_dev *dev, |
300 | unsigned int type, unsigned int code, int value) | |
301 | { | |
302 | unsigned long flags; | |
509ca1a9 | 303 | |
8006479c | 304 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
509ca1a9 | 305 | |
8006479c DT |
306 | spin_lock_irqsave(&dev->event_lock, flags); |
307 | add_input_randomness(type, code, value); | |
308 | input_handle_event(dev, type, code, value); | |
309 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1da177e4 | 310 | } |
1da177e4 | 311 | } |
ca56fe07 | 312 | EXPORT_SYMBOL(input_event); |
1da177e4 | 313 | |
0e739d28 DT |
314 | /** |
315 | * input_inject_event() - send input event from input handler | |
316 | * @handle: input handle to send event through | |
317 | * @type: type of the event | |
318 | * @code: event code | |
319 | * @value: value of the event | |
320 | * | |
8006479c DT |
321 | * Similar to input_event() but will ignore event if device is |
322 | * "grabbed" and handle injecting event is not the one that owns | |
323 | * the device. | |
0e739d28 | 324 | */ |
8006479c DT |
325 | void input_inject_event(struct input_handle *handle, |
326 | unsigned int type, unsigned int code, int value) | |
1da177e4 | 327 | { |
8006479c DT |
328 | struct input_dev *dev = handle->dev; |
329 | struct input_handle *grab; | |
330 | unsigned long flags; | |
1da177e4 | 331 | |
8006479c DT |
332 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
333 | spin_lock_irqsave(&dev->event_lock, flags); | |
1da177e4 | 334 | |
82ba56c2 | 335 | rcu_read_lock(); |
8006479c DT |
336 | grab = rcu_dereference(dev->grab); |
337 | if (!grab || grab == handle) | |
338 | input_handle_event(dev, type, code, value); | |
82ba56c2 | 339 | rcu_read_unlock(); |
1da177e4 | 340 | |
8006479c DT |
341 | spin_unlock_irqrestore(&dev->event_lock, flags); |
342 | } | |
1da177e4 | 343 | } |
8006479c | 344 | EXPORT_SYMBOL(input_inject_event); |
1da177e4 | 345 | |
8006479c DT |
346 | /** |
347 | * input_grab_device - grabs device for exclusive use | |
348 | * @handle: input handle that wants to own the device | |
349 | * | |
350 | * When a device is grabbed by an input handle all events generated by | |
351 | * the device are delivered only to this handle. Also events injected | |
352 | * by other input handles are ignored while device is grabbed. | |
353 | */ | |
1da177e4 LT |
354 | int input_grab_device(struct input_handle *handle) |
355 | { | |
8006479c DT |
356 | struct input_dev *dev = handle->dev; |
357 | int retval; | |
1da177e4 | 358 | |
8006479c DT |
359 | retval = mutex_lock_interruptible(&dev->mutex); |
360 | if (retval) | |
361 | return retval; | |
362 | ||
363 | if (dev->grab) { | |
364 | retval = -EBUSY; | |
365 | goto out; | |
366 | } | |
367 | ||
368 | rcu_assign_pointer(dev->grab, handle); | |
82ba56c2 | 369 | synchronize_rcu(); |
8006479c DT |
370 | |
371 | out: | |
372 | mutex_unlock(&dev->mutex); | |
373 | return retval; | |
1da177e4 | 374 | } |
ca56fe07 | 375 | EXPORT_SYMBOL(input_grab_device); |
1da177e4 | 376 | |
8006479c | 377 | static void __input_release_device(struct input_handle *handle) |
1da177e4 | 378 | { |
a2b2ed2c | 379 | struct input_dev *dev = handle->dev; |
c7e8dc6e | 380 | |
a2b2ed2c | 381 | if (dev->grab == handle) { |
8006479c DT |
382 | rcu_assign_pointer(dev->grab, NULL); |
383 | /* Make sure input_pass_event() notices that grab is gone */ | |
82ba56c2 | 384 | synchronize_rcu(); |
a2b2ed2c AM |
385 | |
386 | list_for_each_entry(handle, &dev->h_list, d_node) | |
8006479c | 387 | if (handle->open && handle->handler->start) |
c7e8dc6e DT |
388 | handle->handler->start(handle); |
389 | } | |
1da177e4 | 390 | } |
8006479c DT |
391 | |
392 | /** | |
393 | * input_release_device - release previously grabbed device | |
394 | * @handle: input handle that owns the device | |
395 | * | |
396 | * Releases previously grabbed device so that other input handles can | |
397 | * start receiving input events. Upon release all handlers attached | |
398 | * to the device have their start() method called so they have a change | |
399 | * to synchronize device state with the rest of the system. | |
400 | */ | |
401 | void input_release_device(struct input_handle *handle) | |
402 | { | |
403 | struct input_dev *dev = handle->dev; | |
404 | ||
405 | mutex_lock(&dev->mutex); | |
406 | __input_release_device(handle); | |
407 | mutex_unlock(&dev->mutex); | |
408 | } | |
ca56fe07 | 409 | EXPORT_SYMBOL(input_release_device); |
1da177e4 | 410 | |
8006479c DT |
411 | /** |
412 | * input_open_device - open input device | |
413 | * @handle: handle through which device is being accessed | |
414 | * | |
415 | * This function should be called by input handlers when they | |
416 | * want to start receive events from given input device. | |
417 | */ | |
1da177e4 LT |
418 | int input_open_device(struct input_handle *handle) |
419 | { | |
0fbf87ca | 420 | struct input_dev *dev = handle->dev; |
8006479c | 421 | int retval; |
0fbf87ca | 422 | |
8006479c DT |
423 | retval = mutex_lock_interruptible(&dev->mutex); |
424 | if (retval) | |
425 | return retval; | |
426 | ||
427 | if (dev->going_away) { | |
428 | retval = -ENODEV; | |
429 | goto out; | |
430 | } | |
0fbf87ca | 431 | |
1da177e4 | 432 | handle->open++; |
0fbf87ca DT |
433 | |
434 | if (!dev->users++ && dev->open) | |
8006479c DT |
435 | retval = dev->open(dev); |
436 | ||
437 | if (retval) { | |
438 | dev->users--; | |
439 | if (!--handle->open) { | |
440 | /* | |
441 | * Make sure we are not delivering any more events | |
442 | * through this handle | |
443 | */ | |
82ba56c2 | 444 | synchronize_rcu(); |
8006479c DT |
445 | } |
446 | } | |
0fbf87ca | 447 | |
8006479c | 448 | out: |
e676c232 | 449 | mutex_unlock(&dev->mutex); |
8006479c | 450 | return retval; |
1da177e4 | 451 | } |
ca56fe07 | 452 | EXPORT_SYMBOL(input_open_device); |
1da177e4 | 453 | |
8006479c | 454 | int input_flush_device(struct input_handle *handle, struct file *file) |
1da177e4 | 455 | { |
8006479c DT |
456 | struct input_dev *dev = handle->dev; |
457 | int retval; | |
1da177e4 | 458 | |
8006479c DT |
459 | retval = mutex_lock_interruptible(&dev->mutex); |
460 | if (retval) | |
461 | return retval; | |
462 | ||
463 | if (dev->flush) | |
464 | retval = dev->flush(dev, file); | |
465 | ||
466 | mutex_unlock(&dev->mutex); | |
467 | return retval; | |
1da177e4 | 468 | } |
ca56fe07 | 469 | EXPORT_SYMBOL(input_flush_device); |
1da177e4 | 470 | |
8006479c DT |
471 | /** |
472 | * input_close_device - close input device | |
473 | * @handle: handle through which device is being accessed | |
474 | * | |
475 | * This function should be called by input handlers when they | |
476 | * want to stop receive events from given input device. | |
477 | */ | |
1da177e4 LT |
478 | void input_close_device(struct input_handle *handle) |
479 | { | |
0fbf87ca DT |
480 | struct input_dev *dev = handle->dev; |
481 | ||
e676c232 | 482 | mutex_lock(&dev->mutex); |
0fbf87ca | 483 | |
8006479c DT |
484 | __input_release_device(handle); |
485 | ||
0fbf87ca DT |
486 | if (!--dev->users && dev->close) |
487 | dev->close(dev); | |
8006479c DT |
488 | |
489 | if (!--handle->open) { | |
490 | /* | |
82ba56c2 | 491 | * synchronize_rcu() makes sure that input_pass_event() |
8006479c DT |
492 | * completed and that no more input events are delivered |
493 | * through this handle | |
494 | */ | |
82ba56c2 | 495 | synchronize_rcu(); |
8006479c | 496 | } |
0fbf87ca | 497 | |
e676c232 | 498 | mutex_unlock(&dev->mutex); |
1da177e4 | 499 | } |
ca56fe07 | 500 | EXPORT_SYMBOL(input_close_device); |
1da177e4 | 501 | |
8006479c DT |
502 | /* |
503 | * Prepare device for unregistering | |
504 | */ | |
505 | static void input_disconnect_device(struct input_dev *dev) | |
506 | { | |
507 | struct input_handle *handle; | |
508 | int code; | |
509 | ||
510 | /* | |
511 | * Mark device as going away. Note that we take dev->mutex here | |
512 | * not to protect access to dev->going_away but rather to ensure | |
513 | * that there are no threads in the middle of input_open_device() | |
514 | */ | |
515 | mutex_lock(&dev->mutex); | |
516 | dev->going_away = 1; | |
517 | mutex_unlock(&dev->mutex); | |
518 | ||
519 | spin_lock_irq(&dev->event_lock); | |
520 | ||
521 | /* | |
522 | * Simulate keyup events for all pressed keys so that handlers | |
523 | * are not left with "stuck" keys. The driver may continue | |
524 | * generate events even after we done here but they will not | |
525 | * reach any handlers. | |
526 | */ | |
527 | if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) { | |
528 | for (code = 0; code <= KEY_MAX; code++) { | |
529 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
f4f37c8e | 530 | __test_and_clear_bit(code, dev->key)) { |
8006479c DT |
531 | input_pass_event(dev, EV_KEY, code, 0); |
532 | } | |
533 | } | |
534 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
535 | } | |
536 | ||
537 | list_for_each_entry(handle, &dev->h_list, d_node) | |
538 | handle->open = 0; | |
539 | ||
540 | spin_unlock_irq(&dev->event_lock); | |
541 | } | |
542 | ||
c8e4c772 MR |
543 | static int input_fetch_keycode(struct input_dev *dev, int scancode) |
544 | { | |
545 | switch (dev->keycodesize) { | |
546 | case 1: | |
547 | return ((u8 *)dev->keycode)[scancode]; | |
548 | ||
549 | case 2: | |
550 | return ((u16 *)dev->keycode)[scancode]; | |
551 | ||
552 | default: | |
553 | return ((u32 *)dev->keycode)[scancode]; | |
554 | } | |
555 | } | |
556 | ||
557 | static int input_default_getkeycode(struct input_dev *dev, | |
558 | int scancode, int *keycode) | |
559 | { | |
560 | if (!dev->keycodesize) | |
561 | return -EINVAL; | |
562 | ||
f4f37c8e | 563 | if (scancode >= dev->keycodemax) |
c8e4c772 MR |
564 | return -EINVAL; |
565 | ||
566 | *keycode = input_fetch_keycode(dev, scancode); | |
567 | ||
568 | return 0; | |
569 | } | |
570 | ||
571 | static int input_default_setkeycode(struct input_dev *dev, | |
572 | int scancode, int keycode) | |
573 | { | |
574 | int old_keycode; | |
575 | int i; | |
576 | ||
f4f37c8e | 577 | if (scancode >= dev->keycodemax) |
c8e4c772 MR |
578 | return -EINVAL; |
579 | ||
580 | if (!dev->keycodesize) | |
581 | return -EINVAL; | |
582 | ||
583 | if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8))) | |
584 | return -EINVAL; | |
585 | ||
586 | switch (dev->keycodesize) { | |
587 | case 1: { | |
588 | u8 *k = (u8 *)dev->keycode; | |
589 | old_keycode = k[scancode]; | |
590 | k[scancode] = keycode; | |
591 | break; | |
592 | } | |
593 | case 2: { | |
594 | u16 *k = (u16 *)dev->keycode; | |
595 | old_keycode = k[scancode]; | |
596 | k[scancode] = keycode; | |
597 | break; | |
598 | } | |
599 | default: { | |
600 | u32 *k = (u32 *)dev->keycode; | |
601 | old_keycode = k[scancode]; | |
602 | k[scancode] = keycode; | |
603 | break; | |
604 | } | |
605 | } | |
606 | ||
607 | clear_bit(old_keycode, dev->keybit); | |
608 | set_bit(keycode, dev->keybit); | |
609 | ||
610 | for (i = 0; i < dev->keycodemax; i++) { | |
611 | if (input_fetch_keycode(dev, i) == old_keycode) { | |
612 | set_bit(old_keycode, dev->keybit); | |
613 | break; /* Setting the bit twice is useless, so break */ | |
614 | } | |
615 | } | |
616 | ||
617 | return 0; | |
618 | } | |
619 | ||
f4f37c8e DT |
620 | /** |
621 | * input_get_keycode - retrieve keycode currently mapped to a given scancode | |
622 | * @dev: input device which keymap is being queried | |
623 | * @scancode: scancode (or its equivalent for device in question) for which | |
624 | * keycode is needed | |
625 | * @keycode: result | |
626 | * | |
627 | * This function should be called by anyone interested in retrieving current | |
628 | * keymap. Presently keyboard and evdev handlers use it. | |
629 | */ | |
630 | int input_get_keycode(struct input_dev *dev, int scancode, int *keycode) | |
631 | { | |
632 | if (scancode < 0) | |
633 | return -EINVAL; | |
634 | ||
635 | return dev->getkeycode(dev, scancode, keycode); | |
636 | } | |
637 | EXPORT_SYMBOL(input_get_keycode); | |
638 | ||
639 | /** | |
640 | * input_get_keycode - assign new keycode to a given scancode | |
641 | * @dev: input device which keymap is being updated | |
642 | * @scancode: scancode (or its equivalent for device in question) | |
643 | * @keycode: new keycode to be assigned to the scancode | |
644 | * | |
645 | * This function should be called by anyone needing to update current | |
646 | * keymap. Presently keyboard and evdev handlers use it. | |
647 | */ | |
648 | int input_set_keycode(struct input_dev *dev, int scancode, int keycode) | |
649 | { | |
650 | unsigned long flags; | |
651 | int old_keycode; | |
652 | int retval; | |
653 | ||
654 | if (scancode < 0) | |
655 | return -EINVAL; | |
656 | ||
657 | if (keycode < 0 || keycode > KEY_MAX) | |
658 | return -EINVAL; | |
659 | ||
660 | spin_lock_irqsave(&dev->event_lock, flags); | |
661 | ||
662 | retval = dev->getkeycode(dev, scancode, &old_keycode); | |
663 | if (retval) | |
664 | goto out; | |
665 | ||
666 | retval = dev->setkeycode(dev, scancode, keycode); | |
667 | if (retval) | |
668 | goto out; | |
669 | ||
670 | /* | |
671 | * Simulate keyup event if keycode is not present | |
672 | * in the keymap anymore | |
673 | */ | |
674 | if (test_bit(EV_KEY, dev->evbit) && | |
675 | !is_event_supported(old_keycode, dev->keybit, KEY_MAX) && | |
676 | __test_and_clear_bit(old_keycode, dev->key)) { | |
677 | ||
678 | input_pass_event(dev, EV_KEY, old_keycode, 0); | |
679 | if (dev->sync) | |
680 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
681 | } | |
682 | ||
683 | out: | |
684 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
685 | ||
686 | return retval; | |
687 | } | |
688 | EXPORT_SYMBOL(input_set_keycode); | |
c8e4c772 | 689 | |
1da177e4 | 690 | #define MATCH_BIT(bit, max) \ |
7b19ada2 | 691 | for (i = 0; i < BITS_TO_LONGS(max); i++) \ |
1da177e4 LT |
692 | if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \ |
693 | break; \ | |
7b19ada2 | 694 | if (i != BITS_TO_LONGS(max)) \ |
1da177e4 LT |
695 | continue; |
696 | ||
66e66118 DT |
697 | static const struct input_device_id *input_match_device(const struct input_device_id *id, |
698 | struct input_dev *dev) | |
1da177e4 LT |
699 | { |
700 | int i; | |
701 | ||
702 | for (; id->flags || id->driver_info; id++) { | |
703 | ||
704 | if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) | |
ddc5d341 | 705 | if (id->bustype != dev->id.bustype) |
1da177e4 LT |
706 | continue; |
707 | ||
708 | if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) | |
ddc5d341 | 709 | if (id->vendor != dev->id.vendor) |
1da177e4 LT |
710 | continue; |
711 | ||
712 | if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) | |
ddc5d341 | 713 | if (id->product != dev->id.product) |
1da177e4 LT |
714 | continue; |
715 | ||
716 | if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) | |
ddc5d341 | 717 | if (id->version != dev->id.version) |
1da177e4 LT |
718 | continue; |
719 | ||
720 | MATCH_BIT(evbit, EV_MAX); | |
721 | MATCH_BIT(keybit, KEY_MAX); | |
722 | MATCH_BIT(relbit, REL_MAX); | |
723 | MATCH_BIT(absbit, ABS_MAX); | |
724 | MATCH_BIT(mscbit, MSC_MAX); | |
725 | MATCH_BIT(ledbit, LED_MAX); | |
726 | MATCH_BIT(sndbit, SND_MAX); | |
727 | MATCH_BIT(ffbit, FF_MAX); | |
ff13f98b | 728 | MATCH_BIT(swbit, SW_MAX); |
1da177e4 LT |
729 | |
730 | return id; | |
731 | } | |
732 | ||
733 | return NULL; | |
734 | } | |
735 | ||
5b2a0826 DT |
736 | static int input_attach_handler(struct input_dev *dev, struct input_handler *handler) |
737 | { | |
738 | const struct input_device_id *id; | |
739 | int error; | |
740 | ||
741 | if (handler->blacklist && input_match_device(handler->blacklist, dev)) | |
742 | return -ENODEV; | |
743 | ||
744 | id = input_match_device(handler->id_table, dev); | |
745 | if (!id) | |
746 | return -ENODEV; | |
747 | ||
748 | error = handler->connect(handler, dev, id); | |
749 | if (error && error != -ENODEV) | |
750 | printk(KERN_ERR | |
751 | "input: failed to attach handler %s to device %s, " | |
752 | "error: %d\n", | |
9657d75c | 753 | handler->name, kobject_name(&dev->dev.kobj), error); |
5b2a0826 DT |
754 | |
755 | return error; | |
756 | } | |
757 | ||
758 | ||
f96b434d DT |
759 | #ifdef CONFIG_PROC_FS |
760 | ||
761 | static struct proc_dir_entry *proc_bus_input_dir; | |
762 | static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); | |
763 | static int input_devices_state; | |
764 | ||
765 | static inline void input_wakeup_procfs_readers(void) | |
766 | { | |
767 | input_devices_state++; | |
768 | wake_up(&input_devices_poll_wait); | |
769 | } | |
770 | ||
969b21cd | 771 | static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait) |
f96b434d | 772 | { |
f96b434d | 773 | poll_wait(file, &input_devices_poll_wait, wait); |
fa886612 DT |
774 | if (file->f_version != input_devices_state) { |
775 | file->f_version = input_devices_state; | |
f96b434d | 776 | return POLLIN | POLLRDNORM; |
fa886612 | 777 | } |
1e0afb28 | 778 | |
f96b434d DT |
779 | return 0; |
780 | } | |
781 | ||
969b21cd DT |
782 | static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) |
783 | { | |
8006479c DT |
784 | if (mutex_lock_interruptible(&input_mutex)) |
785 | return NULL; | |
f96b434d | 786 | |
ad5d972c | 787 | return seq_list_start(&input_dev_list, *pos); |
969b21cd | 788 | } |
051b2fea | 789 | |
969b21cd DT |
790 | static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
791 | { | |
ad5d972c | 792 | return seq_list_next(v, &input_dev_list, pos); |
969b21cd | 793 | } |
f96b434d | 794 | |
969b21cd DT |
795 | static void input_devices_seq_stop(struct seq_file *seq, void *v) |
796 | { | |
8006479c | 797 | mutex_unlock(&input_mutex); |
969b21cd | 798 | } |
f96b434d | 799 | |
969b21cd DT |
800 | static void input_seq_print_bitmap(struct seq_file *seq, const char *name, |
801 | unsigned long *bitmap, int max) | |
802 | { | |
803 | int i; | |
051b2fea | 804 | |
7b19ada2 | 805 | for (i = BITS_TO_LONGS(max) - 1; i > 0; i--) |
969b21cd DT |
806 | if (bitmap[i]) |
807 | break; | |
f96b434d | 808 | |
969b21cd DT |
809 | seq_printf(seq, "B: %s=", name); |
810 | for (; i >= 0; i--) | |
811 | seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : ""); | |
812 | seq_putc(seq, '\n'); | |
813 | } | |
f96b434d | 814 | |
969b21cd DT |
815 | static int input_devices_seq_show(struct seq_file *seq, void *v) |
816 | { | |
817 | struct input_dev *dev = container_of(v, struct input_dev, node); | |
9657d75c | 818 | const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
969b21cd DT |
819 | struct input_handle *handle; |
820 | ||
821 | seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", | |
822 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); | |
823 | ||
824 | seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); | |
825 | seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : ""); | |
826 | seq_printf(seq, "S: Sysfs=%s\n", path ? path : ""); | |
15e03ae8 | 827 | seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : ""); |
969b21cd DT |
828 | seq_printf(seq, "H: Handlers="); |
829 | ||
830 | list_for_each_entry(handle, &dev->h_list, d_node) | |
831 | seq_printf(seq, "%s ", handle->name); | |
832 | seq_putc(seq, '\n'); | |
833 | ||
834 | input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); | |
835 | if (test_bit(EV_KEY, dev->evbit)) | |
836 | input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); | |
837 | if (test_bit(EV_REL, dev->evbit)) | |
838 | input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); | |
839 | if (test_bit(EV_ABS, dev->evbit)) | |
840 | input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); | |
841 | if (test_bit(EV_MSC, dev->evbit)) | |
842 | input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); | |
843 | if (test_bit(EV_LED, dev->evbit)) | |
844 | input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); | |
845 | if (test_bit(EV_SND, dev->evbit)) | |
846 | input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); | |
847 | if (test_bit(EV_FF, dev->evbit)) | |
848 | input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); | |
849 | if (test_bit(EV_SW, dev->evbit)) | |
850 | input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); | |
851 | ||
852 | seq_putc(seq, '\n'); | |
853 | ||
854 | kfree(path); | |
855 | return 0; | |
f96b434d DT |
856 | } |
857 | ||
cec69c37 | 858 | static const struct seq_operations input_devices_seq_ops = { |
969b21cd DT |
859 | .start = input_devices_seq_start, |
860 | .next = input_devices_seq_next, | |
861 | .stop = input_devices_seq_stop, | |
862 | .show = input_devices_seq_show, | |
863 | }; | |
864 | ||
865 | static int input_proc_devices_open(struct inode *inode, struct file *file) | |
f96b434d | 866 | { |
969b21cd DT |
867 | return seq_open(file, &input_devices_seq_ops); |
868 | } | |
869 | ||
2b8693c0 | 870 | static const struct file_operations input_devices_fileops = { |
969b21cd DT |
871 | .owner = THIS_MODULE, |
872 | .open = input_proc_devices_open, | |
873 | .poll = input_proc_devices_poll, | |
874 | .read = seq_read, | |
875 | .llseek = seq_lseek, | |
876 | .release = seq_release, | |
877 | }; | |
878 | ||
879 | static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) | |
880 | { | |
8006479c DT |
881 | if (mutex_lock_interruptible(&input_mutex)) |
882 | return NULL; | |
883 | ||
969b21cd | 884 | seq->private = (void *)(unsigned long)*pos; |
ad5d972c | 885 | return seq_list_start(&input_handler_list, *pos); |
969b21cd | 886 | } |
f96b434d | 887 | |
969b21cd DT |
888 | static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
889 | { | |
890 | seq->private = (void *)(unsigned long)(*pos + 1); | |
ad5d972c | 891 | return seq_list_next(v, &input_handler_list, pos); |
f96b434d DT |
892 | } |
893 | ||
969b21cd DT |
894 | static void input_handlers_seq_stop(struct seq_file *seq, void *v) |
895 | { | |
8006479c | 896 | mutex_unlock(&input_mutex); |
969b21cd DT |
897 | } |
898 | ||
899 | static int input_handlers_seq_show(struct seq_file *seq, void *v) | |
900 | { | |
901 | struct input_handler *handler = container_of(v, struct input_handler, node); | |
902 | ||
903 | seq_printf(seq, "N: Number=%ld Name=%s", | |
904 | (unsigned long)seq->private, handler->name); | |
905 | if (handler->fops) | |
906 | seq_printf(seq, " Minor=%d", handler->minor); | |
907 | seq_putc(seq, '\n'); | |
908 | ||
909 | return 0; | |
910 | } | |
cec69c37 | 911 | static const struct seq_operations input_handlers_seq_ops = { |
969b21cd DT |
912 | .start = input_handlers_seq_start, |
913 | .next = input_handlers_seq_next, | |
914 | .stop = input_handlers_seq_stop, | |
915 | .show = input_handlers_seq_show, | |
916 | }; | |
917 | ||
918 | static int input_proc_handlers_open(struct inode *inode, struct file *file) | |
919 | { | |
920 | return seq_open(file, &input_handlers_seq_ops); | |
921 | } | |
922 | ||
2b8693c0 | 923 | static const struct file_operations input_handlers_fileops = { |
969b21cd DT |
924 | .owner = THIS_MODULE, |
925 | .open = input_proc_handlers_open, | |
926 | .read = seq_read, | |
927 | .llseek = seq_lseek, | |
928 | .release = seq_release, | |
929 | }; | |
f96b434d DT |
930 | |
931 | static int __init input_proc_init(void) | |
932 | { | |
933 | struct proc_dir_entry *entry; | |
934 | ||
9c37066d | 935 | proc_bus_input_dir = proc_mkdir("bus/input", NULL); |
f96b434d DT |
936 | if (!proc_bus_input_dir) |
937 | return -ENOMEM; | |
938 | ||
c7705f34 DL |
939 | entry = proc_create("devices", 0, proc_bus_input_dir, |
940 | &input_devices_fileops); | |
f96b434d DT |
941 | if (!entry) |
942 | goto fail1; | |
943 | ||
c7705f34 DL |
944 | entry = proc_create("handlers", 0, proc_bus_input_dir, |
945 | &input_handlers_fileops); | |
f96b434d DT |
946 | if (!entry) |
947 | goto fail2; | |
948 | ||
f96b434d DT |
949 | return 0; |
950 | ||
951 | fail2: remove_proc_entry("devices", proc_bus_input_dir); | |
9c37066d | 952 | fail1: remove_proc_entry("bus/input", NULL); |
f96b434d DT |
953 | return -ENOMEM; |
954 | } | |
955 | ||
beffbdc2 | 956 | static void input_proc_exit(void) |
f96b434d DT |
957 | { |
958 | remove_proc_entry("devices", proc_bus_input_dir); | |
959 | remove_proc_entry("handlers", proc_bus_input_dir); | |
9c37066d | 960 | remove_proc_entry("bus/input", NULL); |
f96b434d DT |
961 | } |
962 | ||
963 | #else /* !CONFIG_PROC_FS */ | |
964 | static inline void input_wakeup_procfs_readers(void) { } | |
965 | static inline int input_proc_init(void) { return 0; } | |
966 | static inline void input_proc_exit(void) { } | |
967 | #endif | |
968 | ||
9657d75c DT |
969 | #define INPUT_DEV_STRING_ATTR_SHOW(name) \ |
970 | static ssize_t input_dev_show_##name(struct device *dev, \ | |
971 | struct device_attribute *attr, \ | |
972 | char *buf) \ | |
973 | { \ | |
974 | struct input_dev *input_dev = to_input_dev(dev); \ | |
975 | \ | |
976 | return scnprintf(buf, PAGE_SIZE, "%s\n", \ | |
977 | input_dev->name ? input_dev->name : ""); \ | |
978 | } \ | |
979 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL) | |
5c1e9a6a DT |
980 | |
981 | INPUT_DEV_STRING_ATTR_SHOW(name); | |
982 | INPUT_DEV_STRING_ATTR_SHOW(phys); | |
983 | INPUT_DEV_STRING_ATTR_SHOW(uniq); | |
984 | ||
ac648a6a DT |
985 | static int input_print_modalias_bits(char *buf, int size, |
986 | char name, unsigned long *bm, | |
987 | unsigned int min_bit, unsigned int max_bit) | |
1d8f430c | 988 | { |
ac648a6a | 989 | int len = 0, i; |
1d8f430c | 990 | |
ac648a6a DT |
991 | len += snprintf(buf, max(size, 0), "%c", name); |
992 | for (i = min_bit; i < max_bit; i++) | |
7b19ada2 | 993 | if (bm[BIT_WORD(i)] & BIT_MASK(i)) |
ac648a6a | 994 | len += snprintf(buf + len, max(size - len, 0), "%X,", i); |
1d8f430c RR |
995 | return len; |
996 | } | |
997 | ||
2db66876 DT |
998 | static int input_print_modalias(char *buf, int size, struct input_dev *id, |
999 | int add_cr) | |
1d8f430c | 1000 | { |
bd37e5a9 | 1001 | int len; |
1d8f430c | 1002 | |
ac648a6a DT |
1003 | len = snprintf(buf, max(size, 0), |
1004 | "input:b%04Xv%04Xp%04Xe%04X-", | |
1005 | id->id.bustype, id->id.vendor, | |
1006 | id->id.product, id->id.version); | |
1007 | ||
1008 | len += input_print_modalias_bits(buf + len, size - len, | |
1009 | 'e', id->evbit, 0, EV_MAX); | |
1010 | len += input_print_modalias_bits(buf + len, size - len, | |
1011 | 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); | |
1012 | len += input_print_modalias_bits(buf + len, size - len, | |
1013 | 'r', id->relbit, 0, REL_MAX); | |
1014 | len += input_print_modalias_bits(buf + len, size - len, | |
1015 | 'a', id->absbit, 0, ABS_MAX); | |
1016 | len += input_print_modalias_bits(buf + len, size - len, | |
1017 | 'm', id->mscbit, 0, MSC_MAX); | |
1018 | len += input_print_modalias_bits(buf + len, size - len, | |
1019 | 'l', id->ledbit, 0, LED_MAX); | |
1020 | len += input_print_modalias_bits(buf + len, size - len, | |
1021 | 's', id->sndbit, 0, SND_MAX); | |
1022 | len += input_print_modalias_bits(buf + len, size - len, | |
1023 | 'f', id->ffbit, 0, FF_MAX); | |
1024 | len += input_print_modalias_bits(buf + len, size - len, | |
1025 | 'w', id->swbit, 0, SW_MAX); | |
2db66876 DT |
1026 | |
1027 | if (add_cr) | |
ac648a6a | 1028 | len += snprintf(buf + len, max(size - len, 0), "\n"); |
2db66876 | 1029 | |
bd37e5a9 KS |
1030 | return len; |
1031 | } | |
1032 | ||
9657d75c DT |
1033 | static ssize_t input_dev_show_modalias(struct device *dev, |
1034 | struct device_attribute *attr, | |
1035 | char *buf) | |
bd37e5a9 KS |
1036 | { |
1037 | struct input_dev *id = to_input_dev(dev); | |
1038 | ssize_t len; | |
1039 | ||
2db66876 DT |
1040 | len = input_print_modalias(buf, PAGE_SIZE, id, 1); |
1041 | ||
8a3cf456 | 1042 | return min_t(int, len, PAGE_SIZE); |
1d8f430c | 1043 | } |
9657d75c | 1044 | static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); |
1d8f430c | 1045 | |
629b77a4 | 1046 | static struct attribute *input_dev_attrs[] = { |
9657d75c DT |
1047 | &dev_attr_name.attr, |
1048 | &dev_attr_phys.attr, | |
1049 | &dev_attr_uniq.attr, | |
1050 | &dev_attr_modalias.attr, | |
629b77a4 GKH |
1051 | NULL |
1052 | }; | |
1053 | ||
bd0ef235 | 1054 | static struct attribute_group input_dev_attr_group = { |
629b77a4 | 1055 | .attrs = input_dev_attrs, |
5c1e9a6a DT |
1056 | }; |
1057 | ||
9657d75c DT |
1058 | #define INPUT_DEV_ID_ATTR(name) \ |
1059 | static ssize_t input_dev_show_id_##name(struct device *dev, \ | |
1060 | struct device_attribute *attr, \ | |
1061 | char *buf) \ | |
1062 | { \ | |
1063 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1064 | return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \ | |
1065 | } \ | |
1066 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL) | |
5c1e9a6a DT |
1067 | |
1068 | INPUT_DEV_ID_ATTR(bustype); | |
1069 | INPUT_DEV_ID_ATTR(vendor); | |
1070 | INPUT_DEV_ID_ATTR(product); | |
1071 | INPUT_DEV_ID_ATTR(version); | |
1072 | ||
1073 | static struct attribute *input_dev_id_attrs[] = { | |
9657d75c DT |
1074 | &dev_attr_bustype.attr, |
1075 | &dev_attr_vendor.attr, | |
1076 | &dev_attr_product.attr, | |
1077 | &dev_attr_version.attr, | |
5c1e9a6a DT |
1078 | NULL |
1079 | }; | |
1080 | ||
1081 | static struct attribute_group input_dev_id_attr_group = { | |
1082 | .name = "id", | |
1083 | .attrs = input_dev_id_attrs, | |
1084 | }; | |
1085 | ||
969b21cd DT |
1086 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1087 | int max, int add_cr) | |
1088 | { | |
1089 | int i; | |
1090 | int len = 0; | |
1091 | ||
7b19ada2 | 1092 | for (i = BITS_TO_LONGS(max) - 1; i > 0; i--) |
969b21cd DT |
1093 | if (bitmap[i]) |
1094 | break; | |
1095 | ||
1096 | for (; i >= 0; i--) | |
1097 | len += snprintf(buf + len, max(buf_size - len, 0), | |
1098 | "%lx%s", bitmap[i], i > 0 ? " " : ""); | |
1099 | ||
1100 | if (add_cr) | |
1101 | len += snprintf(buf + len, max(buf_size - len, 0), "\n"); | |
1102 | ||
1103 | return len; | |
1104 | } | |
1105 | ||
9657d75c DT |
1106 | #define INPUT_DEV_CAP_ATTR(ev, bm) \ |
1107 | static ssize_t input_dev_show_cap_##bm(struct device *dev, \ | |
1108 | struct device_attribute *attr, \ | |
1109 | char *buf) \ | |
1110 | { \ | |
1111 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1112 | int len = input_print_bitmap(buf, PAGE_SIZE, \ | |
1113 | input_dev->bm##bit, ev##_MAX, 1); \ | |
1114 | return min_t(int, len, PAGE_SIZE); \ | |
1115 | } \ | |
1116 | static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL) | |
5c1e9a6a DT |
1117 | |
1118 | INPUT_DEV_CAP_ATTR(EV, ev); | |
1119 | INPUT_DEV_CAP_ATTR(KEY, key); | |
1120 | INPUT_DEV_CAP_ATTR(REL, rel); | |
1121 | INPUT_DEV_CAP_ATTR(ABS, abs); | |
1122 | INPUT_DEV_CAP_ATTR(MSC, msc); | |
1123 | INPUT_DEV_CAP_ATTR(LED, led); | |
1124 | INPUT_DEV_CAP_ATTR(SND, snd); | |
1125 | INPUT_DEV_CAP_ATTR(FF, ff); | |
1126 | INPUT_DEV_CAP_ATTR(SW, sw); | |
1127 | ||
1128 | static struct attribute *input_dev_caps_attrs[] = { | |
9657d75c DT |
1129 | &dev_attr_ev.attr, |
1130 | &dev_attr_key.attr, | |
1131 | &dev_attr_rel.attr, | |
1132 | &dev_attr_abs.attr, | |
1133 | &dev_attr_msc.attr, | |
1134 | &dev_attr_led.attr, | |
1135 | &dev_attr_snd.attr, | |
1136 | &dev_attr_ff.attr, | |
1137 | &dev_attr_sw.attr, | |
5c1e9a6a DT |
1138 | NULL |
1139 | }; | |
1140 | ||
1141 | static struct attribute_group input_dev_caps_attr_group = { | |
1142 | .name = "capabilities", | |
1143 | .attrs = input_dev_caps_attrs, | |
1144 | }; | |
1145 | ||
cb9def4d DT |
1146 | static struct attribute_group *input_dev_attr_groups[] = { |
1147 | &input_dev_attr_group, | |
1148 | &input_dev_id_attr_group, | |
1149 | &input_dev_caps_attr_group, | |
1150 | NULL | |
1151 | }; | |
1152 | ||
9657d75c | 1153 | static void input_dev_release(struct device *device) |
d19fbe8a | 1154 | { |
9657d75c | 1155 | struct input_dev *dev = to_input_dev(device); |
d19fbe8a | 1156 | |
509ca1a9 | 1157 | input_ff_destroy(dev); |
d19fbe8a | 1158 | kfree(dev); |
509ca1a9 | 1159 | |
d19fbe8a DT |
1160 | module_put(THIS_MODULE); |
1161 | } | |
1162 | ||
a7fadbe1 | 1163 | /* |
312c004d | 1164 | * Input uevent interface - loading event handlers based on |
a7fadbe1 DT |
1165 | * device bitfields. |
1166 | */ | |
7eff2e7a | 1167 | static int input_add_uevent_bm_var(struct kobj_uevent_env *env, |
ac648a6a | 1168 | const char *name, unsigned long *bitmap, int max) |
a7fadbe1 | 1169 | { |
7eff2e7a | 1170 | int len; |
a7fadbe1 | 1171 | |
7eff2e7a | 1172 | if (add_uevent_var(env, "%s=", name)) |
a7fadbe1 DT |
1173 | return -ENOMEM; |
1174 | ||
7eff2e7a KS |
1175 | len = input_print_bitmap(&env->buf[env->buflen - 1], |
1176 | sizeof(env->buf) - env->buflen, | |
1177 | bitmap, max, 0); | |
1178 | if (len >= (sizeof(env->buf) - env->buflen)) | |
a7fadbe1 DT |
1179 | return -ENOMEM; |
1180 | ||
7eff2e7a | 1181 | env->buflen += len; |
a7fadbe1 DT |
1182 | return 0; |
1183 | } | |
1184 | ||
7eff2e7a | 1185 | static int input_add_uevent_modalias_var(struct kobj_uevent_env *env, |
ac648a6a DT |
1186 | struct input_dev *dev) |
1187 | { | |
7eff2e7a | 1188 | int len; |
ac648a6a | 1189 | |
7eff2e7a | 1190 | if (add_uevent_var(env, "MODALIAS=")) |
ac648a6a DT |
1191 | return -ENOMEM; |
1192 | ||
7eff2e7a KS |
1193 | len = input_print_modalias(&env->buf[env->buflen - 1], |
1194 | sizeof(env->buf) - env->buflen, | |
1195 | dev, 0); | |
1196 | if (len >= (sizeof(env->buf) - env->buflen)) | |
ac648a6a DT |
1197 | return -ENOMEM; |
1198 | ||
7eff2e7a | 1199 | env->buflen += len; |
ac648a6a DT |
1200 | return 0; |
1201 | } | |
1202 | ||
a7fadbe1 DT |
1203 | #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \ |
1204 | do { \ | |
7eff2e7a | 1205 | int err = add_uevent_var(env, fmt, val); \ |
a7fadbe1 DT |
1206 | if (err) \ |
1207 | return err; \ | |
1208 | } while (0) | |
1209 | ||
1210 | #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \ | |
1211 | do { \ | |
7eff2e7a | 1212 | int err = input_add_uevent_bm_var(env, name, bm, max); \ |
a7fadbe1 DT |
1213 | if (err) \ |
1214 | return err; \ | |
1215 | } while (0) | |
1216 | ||
ac648a6a DT |
1217 | #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \ |
1218 | do { \ | |
7eff2e7a | 1219 | int err = input_add_uevent_modalias_var(env, dev); \ |
ac648a6a DT |
1220 | if (err) \ |
1221 | return err; \ | |
1222 | } while (0) | |
1223 | ||
7eff2e7a | 1224 | static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env) |
a7fadbe1 | 1225 | { |
9657d75c | 1226 | struct input_dev *dev = to_input_dev(device); |
a7fadbe1 DT |
1227 | |
1228 | INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x", | |
1229 | dev->id.bustype, dev->id.vendor, | |
1230 | dev->id.product, dev->id.version); | |
1231 | if (dev->name) | |
1232 | INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); | |
1233 | if (dev->phys) | |
1234 | INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); | |
08de1f04 | 1235 | if (dev->uniq) |
a7fadbe1 DT |
1236 | INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); |
1237 | ||
1238 | INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX); | |
1239 | if (test_bit(EV_KEY, dev->evbit)) | |
1240 | INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX); | |
1241 | if (test_bit(EV_REL, dev->evbit)) | |
1242 | INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX); | |
1243 | if (test_bit(EV_ABS, dev->evbit)) | |
1244 | INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX); | |
1245 | if (test_bit(EV_MSC, dev->evbit)) | |
1246 | INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX); | |
1247 | if (test_bit(EV_LED, dev->evbit)) | |
1248 | INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX); | |
1249 | if (test_bit(EV_SND, dev->evbit)) | |
1250 | INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX); | |
1251 | if (test_bit(EV_FF, dev->evbit)) | |
1252 | INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX); | |
1253 | if (test_bit(EV_SW, dev->evbit)) | |
1254 | INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); | |
1255 | ||
ac648a6a | 1256 | INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); |
a7fadbe1 DT |
1257 | |
1258 | return 0; | |
1259 | } | |
1260 | ||
9657d75c DT |
1261 | static struct device_type input_dev_type = { |
1262 | .groups = input_dev_attr_groups, | |
1263 | .release = input_dev_release, | |
1264 | .uevent = input_dev_uevent, | |
1265 | }; | |
1266 | ||
ea9f240b | 1267 | struct class input_class = { |
9657d75c | 1268 | .name = "input", |
d19fbe8a | 1269 | }; |
ca56fe07 | 1270 | EXPORT_SYMBOL_GPL(input_class); |
d19fbe8a | 1271 | |
1447190e DT |
1272 | /** |
1273 | * input_allocate_device - allocate memory for new input device | |
1274 | * | |
1275 | * Returns prepared struct input_dev or NULL. | |
1276 | * | |
1277 | * NOTE: Use input_free_device() to free devices that have not been | |
1278 | * registered; input_unregister_device() should be used for already | |
1279 | * registered devices. | |
1280 | */ | |
d19fbe8a DT |
1281 | struct input_dev *input_allocate_device(void) |
1282 | { | |
1283 | struct input_dev *dev; | |
1284 | ||
1285 | dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); | |
1286 | if (dev) { | |
9657d75c DT |
1287 | dev->dev.type = &input_dev_type; |
1288 | dev->dev.class = &input_class; | |
1289 | device_initialize(&dev->dev); | |
f60d2b11 | 1290 | mutex_init(&dev->mutex); |
8006479c | 1291 | spin_lock_init(&dev->event_lock); |
d19fbe8a DT |
1292 | INIT_LIST_HEAD(&dev->h_list); |
1293 | INIT_LIST_HEAD(&dev->node); | |
655816e4 DT |
1294 | |
1295 | __module_get(THIS_MODULE); | |
d19fbe8a DT |
1296 | } |
1297 | ||
1298 | return dev; | |
1299 | } | |
ca56fe07 | 1300 | EXPORT_SYMBOL(input_allocate_device); |
d19fbe8a | 1301 | |
1447190e DT |
1302 | /** |
1303 | * input_free_device - free memory occupied by input_dev structure | |
1304 | * @dev: input device to free | |
1305 | * | |
1306 | * This function should only be used if input_register_device() | |
1307 | * was not called yet or if it failed. Once device was registered | |
1308 | * use input_unregister_device() and memory will be freed once last | |
8006479c | 1309 | * reference to the device is dropped. |
1447190e DT |
1310 | * |
1311 | * Device should be allocated by input_allocate_device(). | |
1312 | * | |
1313 | * NOTE: If there are references to the input device then memory | |
1314 | * will not be freed until last reference is dropped. | |
1315 | */ | |
f60d2b11 DT |
1316 | void input_free_device(struct input_dev *dev) |
1317 | { | |
54f9e36c | 1318 | if (dev) |
f60d2b11 | 1319 | input_put_device(dev); |
f60d2b11 | 1320 | } |
ca56fe07 | 1321 | EXPORT_SYMBOL(input_free_device); |
f60d2b11 | 1322 | |
534565f2 DT |
1323 | /** |
1324 | * input_set_capability - mark device as capable of a certain event | |
1325 | * @dev: device that is capable of emitting or accepting event | |
1326 | * @type: type of the event (EV_KEY, EV_REL, etc...) | |
1327 | * @code: event code | |
1328 | * | |
1329 | * In addition to setting up corresponding bit in appropriate capability | |
1330 | * bitmap the function also adjusts dev->evbit. | |
1331 | */ | |
1332 | void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code) | |
1333 | { | |
1334 | switch (type) { | |
1335 | case EV_KEY: | |
1336 | __set_bit(code, dev->keybit); | |
1337 | break; | |
1338 | ||
1339 | case EV_REL: | |
1340 | __set_bit(code, dev->relbit); | |
1341 | break; | |
1342 | ||
1343 | case EV_ABS: | |
1344 | __set_bit(code, dev->absbit); | |
1345 | break; | |
1346 | ||
1347 | case EV_MSC: | |
1348 | __set_bit(code, dev->mscbit); | |
1349 | break; | |
1350 | ||
1351 | case EV_SW: | |
1352 | __set_bit(code, dev->swbit); | |
1353 | break; | |
1354 | ||
1355 | case EV_LED: | |
1356 | __set_bit(code, dev->ledbit); | |
1357 | break; | |
1358 | ||
1359 | case EV_SND: | |
1360 | __set_bit(code, dev->sndbit); | |
1361 | break; | |
1362 | ||
1363 | case EV_FF: | |
1364 | __set_bit(code, dev->ffbit); | |
1365 | break; | |
1366 | ||
22d1c398 DES |
1367 | case EV_PWR: |
1368 | /* do nothing */ | |
1369 | break; | |
1370 | ||
534565f2 DT |
1371 | default: |
1372 | printk(KERN_ERR | |
1373 | "input_set_capability: unknown type %u (code %u)\n", | |
1374 | type, code); | |
1375 | dump_stack(); | |
1376 | return; | |
1377 | } | |
1378 | ||
1379 | __set_bit(type, dev->evbit); | |
1380 | } | |
1381 | EXPORT_SYMBOL(input_set_capability); | |
1382 | ||
8006479c DT |
1383 | /** |
1384 | * input_register_device - register device with input core | |
1385 | * @dev: device to be registered | |
1386 | * | |
1387 | * This function registers device with input core. The device must be | |
1388 | * allocated with input_allocate_device() and all it's capabilities | |
1389 | * set up before registering. | |
1390 | * If function fails the device must be freed with input_free_device(). | |
1391 | * Once device has been successfully registered it can be unregistered | |
1392 | * with input_unregister_device(); input_free_device() should not be | |
1393 | * called in this case. | |
1394 | */ | |
5f945489 | 1395 | int input_register_device(struct input_dev *dev) |
1da177e4 | 1396 | { |
bd0ef235 | 1397 | static atomic_t input_no = ATOMIC_INIT(0); |
1da177e4 | 1398 | struct input_handler *handler; |
bd0ef235 DT |
1399 | const char *path; |
1400 | int error; | |
1da177e4 | 1401 | |
8006479c | 1402 | __set_bit(EV_SYN, dev->evbit); |
0fbf87ca | 1403 | |
1da177e4 LT |
1404 | /* |
1405 | * If delay and period are pre-set by the driver, then autorepeating | |
1406 | * is handled by the driver itself and we don't do it in input.c. | |
1407 | */ | |
1408 | ||
1409 | init_timer(&dev->timer); | |
1410 | if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { | |
1411 | dev->timer.data = (long) dev; | |
1412 | dev->timer.function = input_repeat_key; | |
1413 | dev->rep[REP_DELAY] = 250; | |
1414 | dev->rep[REP_PERIOD] = 33; | |
1415 | } | |
1416 | ||
c8e4c772 MR |
1417 | if (!dev->getkeycode) |
1418 | dev->getkeycode = input_default_getkeycode; | |
1419 | ||
1420 | if (!dev->setkeycode) | |
1421 | dev->setkeycode = input_default_setkeycode; | |
1422 | ||
a6c2490f KS |
1423 | dev_set_name(&dev->dev, "input%ld", |
1424 | (unsigned long) atomic_inc_return(&input_no) - 1); | |
bd0ef235 | 1425 | |
9657d75c | 1426 | error = device_add(&dev->dev); |
bd0ef235 DT |
1427 | if (error) |
1428 | return error; | |
1429 | ||
9657d75c | 1430 | path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
bd0ef235 DT |
1431 | printk(KERN_INFO "input: %s as %s\n", |
1432 | dev->name ? dev->name : "Unspecified device", path ? path : "N/A"); | |
1433 | kfree(path); | |
10204020 | 1434 | |
8006479c DT |
1435 | error = mutex_lock_interruptible(&input_mutex); |
1436 | if (error) { | |
1437 | device_del(&dev->dev); | |
1438 | return error; | |
1439 | } | |
1440 | ||
1441 | list_add_tail(&dev->node, &input_dev_list); | |
1442 | ||
1da177e4 | 1443 | list_for_each_entry(handler, &input_handler_list, node) |
5b2a0826 | 1444 | input_attach_handler(dev, handler); |
1da177e4 | 1445 | |
f96b434d | 1446 | input_wakeup_procfs_readers(); |
5f945489 | 1447 | |
8006479c DT |
1448 | mutex_unlock(&input_mutex); |
1449 | ||
5f945489 | 1450 | return 0; |
1da177e4 | 1451 | } |
ca56fe07 | 1452 | EXPORT_SYMBOL(input_register_device); |
1da177e4 | 1453 | |
8006479c DT |
1454 | /** |
1455 | * input_unregister_device - unregister previously registered device | |
1456 | * @dev: device to be unregistered | |
1457 | * | |
1458 | * This function unregisters an input device. Once device is unregistered | |
1459 | * the caller should not try to access it as it may get freed at any moment. | |
1460 | */ | |
1da177e4 LT |
1461 | void input_unregister_device(struct input_dev *dev) |
1462 | { | |
5b2a0826 | 1463 | struct input_handle *handle, *next; |
1da177e4 | 1464 | |
8006479c | 1465 | input_disconnect_device(dev); |
1da177e4 | 1466 | |
8006479c | 1467 | mutex_lock(&input_mutex); |
1da177e4 | 1468 | |
5b2a0826 | 1469 | list_for_each_entry_safe(handle, next, &dev->h_list, d_node) |
1da177e4 | 1470 | handle->handler->disconnect(handle); |
5b2a0826 | 1471 | WARN_ON(!list_empty(&dev->h_list)); |
1da177e4 | 1472 | |
8006479c | 1473 | del_timer_sync(&dev->timer); |
1da177e4 LT |
1474 | list_del_init(&dev->node); |
1475 | ||
f96b434d | 1476 | input_wakeup_procfs_readers(); |
8006479c DT |
1477 | |
1478 | mutex_unlock(&input_mutex); | |
1479 | ||
1480 | device_unregister(&dev->dev); | |
1da177e4 | 1481 | } |
ca56fe07 | 1482 | EXPORT_SYMBOL(input_unregister_device); |
1da177e4 | 1483 | |
8006479c DT |
1484 | /** |
1485 | * input_register_handler - register a new input handler | |
1486 | * @handler: handler to be registered | |
1487 | * | |
1488 | * This function registers a new input handler (interface) for input | |
1489 | * devices in the system and attaches it to all input devices that | |
1490 | * are compatible with the handler. | |
1491 | */ | |
4263cf0f | 1492 | int input_register_handler(struct input_handler *handler) |
1da177e4 LT |
1493 | { |
1494 | struct input_dev *dev; | |
8006479c DT |
1495 | int retval; |
1496 | ||
1497 | retval = mutex_lock_interruptible(&input_mutex); | |
1498 | if (retval) | |
1499 | return retval; | |
1da177e4 | 1500 | |
1da177e4 LT |
1501 | INIT_LIST_HEAD(&handler->h_list); |
1502 | ||
4263cf0f | 1503 | if (handler->fops != NULL) { |
8006479c DT |
1504 | if (input_table[handler->minor >> 5]) { |
1505 | retval = -EBUSY; | |
1506 | goto out; | |
1507 | } | |
1da177e4 | 1508 | input_table[handler->minor >> 5] = handler; |
4263cf0f | 1509 | } |
1da177e4 LT |
1510 | |
1511 | list_add_tail(&handler->node, &input_handler_list); | |
1512 | ||
1513 | list_for_each_entry(dev, &input_dev_list, node) | |
5b2a0826 | 1514 | input_attach_handler(dev, handler); |
1da177e4 | 1515 | |
f96b434d | 1516 | input_wakeup_procfs_readers(); |
8006479c DT |
1517 | |
1518 | out: | |
1519 | mutex_unlock(&input_mutex); | |
1520 | return retval; | |
1da177e4 | 1521 | } |
ca56fe07 | 1522 | EXPORT_SYMBOL(input_register_handler); |
1da177e4 | 1523 | |
8006479c DT |
1524 | /** |
1525 | * input_unregister_handler - unregisters an input handler | |
1526 | * @handler: handler to be unregistered | |
1527 | * | |
1528 | * This function disconnects a handler from its input devices and | |
1529 | * removes it from lists of known handlers. | |
1530 | */ | |
1da177e4 LT |
1531 | void input_unregister_handler(struct input_handler *handler) |
1532 | { | |
5b2a0826 | 1533 | struct input_handle *handle, *next; |
1da177e4 | 1534 | |
8006479c DT |
1535 | mutex_lock(&input_mutex); |
1536 | ||
5b2a0826 | 1537 | list_for_each_entry_safe(handle, next, &handler->h_list, h_node) |
1da177e4 | 1538 | handler->disconnect(handle); |
5b2a0826 | 1539 | WARN_ON(!list_empty(&handler->h_list)); |
1da177e4 LT |
1540 | |
1541 | list_del_init(&handler->node); | |
1542 | ||
1543 | if (handler->fops != NULL) | |
1544 | input_table[handler->minor >> 5] = NULL; | |
1545 | ||
f96b434d | 1546 | input_wakeup_procfs_readers(); |
8006479c DT |
1547 | |
1548 | mutex_unlock(&input_mutex); | |
1da177e4 | 1549 | } |
ca56fe07 | 1550 | EXPORT_SYMBOL(input_unregister_handler); |
1da177e4 | 1551 | |
8006479c DT |
1552 | /** |
1553 | * input_register_handle - register a new input handle | |
1554 | * @handle: handle to register | |
1555 | * | |
1556 | * This function puts a new input handle onto device's | |
1557 | * and handler's lists so that events can flow through | |
1558 | * it once it is opened using input_open_device(). | |
1559 | * | |
1560 | * This function is supposed to be called from handler's | |
1561 | * connect() method. | |
1562 | */ | |
5b2a0826 DT |
1563 | int input_register_handle(struct input_handle *handle) |
1564 | { | |
1565 | struct input_handler *handler = handle->handler; | |
8006479c DT |
1566 | struct input_dev *dev = handle->dev; |
1567 | int error; | |
1568 | ||
1569 | /* | |
1570 | * We take dev->mutex here to prevent race with | |
1571 | * input_release_device(). | |
1572 | */ | |
1573 | error = mutex_lock_interruptible(&dev->mutex); | |
1574 | if (error) | |
1575 | return error; | |
1576 | list_add_tail_rcu(&handle->d_node, &dev->h_list); | |
1577 | mutex_unlock(&dev->mutex); | |
5b2a0826 | 1578 | |
8006479c DT |
1579 | /* |
1580 | * Since we are supposed to be called from ->connect() | |
1581 | * which is mutually exclusive with ->disconnect() | |
1582 | * we can't be racing with input_unregister_handle() | |
1583 | * and so separate lock is not needed here. | |
1584 | */ | |
5b2a0826 DT |
1585 | list_add_tail(&handle->h_node, &handler->h_list); |
1586 | ||
1587 | if (handler->start) | |
1588 | handler->start(handle); | |
1589 | ||
1590 | return 0; | |
1591 | } | |
1592 | EXPORT_SYMBOL(input_register_handle); | |
1593 | ||
8006479c DT |
1594 | /** |
1595 | * input_unregister_handle - unregister an input handle | |
1596 | * @handle: handle to unregister | |
1597 | * | |
1598 | * This function removes input handle from device's | |
1599 | * and handler's lists. | |
1600 | * | |
1601 | * This function is supposed to be called from handler's | |
1602 | * disconnect() method. | |
1603 | */ | |
5b2a0826 DT |
1604 | void input_unregister_handle(struct input_handle *handle) |
1605 | { | |
8006479c DT |
1606 | struct input_dev *dev = handle->dev; |
1607 | ||
5b2a0826 | 1608 | list_del_init(&handle->h_node); |
8006479c DT |
1609 | |
1610 | /* | |
1611 | * Take dev->mutex to prevent race with input_release_device(). | |
1612 | */ | |
1613 | mutex_lock(&dev->mutex); | |
1614 | list_del_rcu(&handle->d_node); | |
1615 | mutex_unlock(&dev->mutex); | |
82ba56c2 | 1616 | synchronize_rcu(); |
5b2a0826 DT |
1617 | } |
1618 | EXPORT_SYMBOL(input_unregister_handle); | |
1619 | ||
1da177e4 LT |
1620 | static int input_open_file(struct inode *inode, struct file *file) |
1621 | { | |
2edbf853 | 1622 | struct input_handler *handler; |
99ac48f5 | 1623 | const struct file_operations *old_fops, *new_fops = NULL; |
1da177e4 LT |
1624 | int err; |
1625 | ||
2edbf853 | 1626 | lock_kernel(); |
1da177e4 | 1627 | /* No load-on-demand here? */ |
2edbf853 JC |
1628 | handler = input_table[iminor(inode) >> 5]; |
1629 | if (!handler || !(new_fops = fops_get(handler->fops))) { | |
1630 | err = -ENODEV; | |
1631 | goto out; | |
1632 | } | |
1da177e4 LT |
1633 | |
1634 | /* | |
1635 | * That's _really_ odd. Usually NULL ->open means "nothing special", | |
1636 | * not "no device". Oh, well... | |
1637 | */ | |
1638 | if (!new_fops->open) { | |
1639 | fops_put(new_fops); | |
2edbf853 JC |
1640 | err = -ENODEV; |
1641 | goto out; | |
1da177e4 LT |
1642 | } |
1643 | old_fops = file->f_op; | |
1644 | file->f_op = new_fops; | |
1645 | ||
1646 | err = new_fops->open(inode, file); | |
1647 | ||
1648 | if (err) { | |
1649 | fops_put(file->f_op); | |
1650 | file->f_op = fops_get(old_fops); | |
1651 | } | |
1652 | fops_put(old_fops); | |
2edbf853 JC |
1653 | out: |
1654 | unlock_kernel(); | |
1da177e4 LT |
1655 | return err; |
1656 | } | |
1657 | ||
2b8693c0 | 1658 | static const struct file_operations input_fops = { |
1da177e4 LT |
1659 | .owner = THIS_MODULE, |
1660 | .open = input_open_file, | |
1661 | }; | |
1662 | ||
61994a61 HR |
1663 | static void __init input_init_abs_bypass(void) |
1664 | { | |
1665 | const unsigned int *p; | |
1666 | ||
1667 | for (p = input_abs_bypass_init_data; *p; p++) | |
1668 | input_abs_bypass[BIT_WORD(*p)] |= BIT_MASK(*p); | |
1669 | } | |
1670 | ||
f96b434d | 1671 | static int __init input_init(void) |
1da177e4 | 1672 | { |
f96b434d | 1673 | int err; |
1da177e4 | 1674 | |
61994a61 HR |
1675 | input_init_abs_bypass(); |
1676 | ||
ea9f240b | 1677 | err = class_register(&input_class); |
d19fbe8a DT |
1678 | if (err) { |
1679 | printk(KERN_ERR "input: unable to register input_dev class\n"); | |
1680 | return err; | |
1681 | } | |
1682 | ||
f96b434d DT |
1683 | err = input_proc_init(); |
1684 | if (err) | |
b0fdfebb | 1685 | goto fail1; |
1da177e4 | 1686 | |
f96b434d DT |
1687 | err = register_chrdev(INPUT_MAJOR, "input", &input_fops); |
1688 | if (err) { | |
1689 | printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR); | |
b0fdfebb | 1690 | goto fail2; |
1da177e4 | 1691 | } |
e334016f | 1692 | |
1da177e4 | 1693 | return 0; |
1da177e4 | 1694 | |
b0fdfebb | 1695 | fail2: input_proc_exit(); |
ea9f240b | 1696 | fail1: class_unregister(&input_class); |
f96b434d | 1697 | return err; |
1da177e4 LT |
1698 | } |
1699 | ||
1700 | static void __exit input_exit(void) | |
1701 | { | |
f96b434d | 1702 | input_proc_exit(); |
1da177e4 | 1703 | unregister_chrdev(INPUT_MAJOR, "input"); |
ea9f240b | 1704 | class_unregister(&input_class); |
1da177e4 LT |
1705 | } |
1706 | ||
1707 | subsys_initcall(input_init); | |
1708 | module_exit(input_exit); |