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, | |
df391e0e | 45 | ABS_MT_TRACKING_ID, |
61994a61 HR |
46 | 0 |
47 | }; | |
48 | static unsigned long input_abs_bypass[BITS_TO_LONGS(ABS_CNT)]; | |
49 | ||
1da177e4 LT |
50 | static LIST_HEAD(input_dev_list); |
51 | static LIST_HEAD(input_handler_list); | |
52 | ||
8006479c DT |
53 | /* |
54 | * input_mutex protects access to both input_dev_list and input_handler_list. | |
55 | * This also causes input_[un]register_device and input_[un]register_handler | |
56 | * be mutually exclusive which simplifies locking in drivers implementing | |
57 | * input handlers. | |
58 | */ | |
59 | static DEFINE_MUTEX(input_mutex); | |
60 | ||
1da177e4 LT |
61 | static struct input_handler *input_table[8]; |
62 | ||
8006479c DT |
63 | static inline int is_event_supported(unsigned int code, |
64 | unsigned long *bm, unsigned int max) | |
1da177e4 | 65 | { |
8006479c DT |
66 | return code <= max && test_bit(code, bm); |
67 | } | |
1da177e4 | 68 | |
8006479c DT |
69 | static int input_defuzz_abs_event(int value, int old_val, int fuzz) |
70 | { | |
71 | if (fuzz) { | |
72 | if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2) | |
73 | return old_val; | |
1da177e4 | 74 | |
8006479c DT |
75 | if (value > old_val - fuzz && value < old_val + fuzz) |
76 | return (old_val * 3 + value) / 4; | |
1da177e4 | 77 | |
8006479c DT |
78 | if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2) |
79 | return (old_val + value) / 2; | |
80 | } | |
1da177e4 | 81 | |
8006479c DT |
82 | return value; |
83 | } | |
1da177e4 | 84 | |
8006479c DT |
85 | /* |
86 | * Pass event through all open handles. This function is called with | |
82ba56c2 | 87 | * dev->event_lock held and interrupts disabled. |
8006479c DT |
88 | */ |
89 | static void input_pass_event(struct input_dev *dev, | |
90 | unsigned int type, unsigned int code, int value) | |
91 | { | |
82ba56c2 DT |
92 | struct input_handle *handle; |
93 | ||
94 | rcu_read_lock(); | |
1da177e4 | 95 | |
82ba56c2 | 96 | handle = rcu_dereference(dev->grab); |
8006479c DT |
97 | if (handle) |
98 | handle->handler->event(handle, type, code, value); | |
99 | else | |
100 | list_for_each_entry_rcu(handle, &dev->h_list, d_node) | |
101 | if (handle->open) | |
102 | handle->handler->event(handle, | |
103 | type, code, value); | |
82ba56c2 | 104 | rcu_read_unlock(); |
8006479c | 105 | } |
1da177e4 | 106 | |
8006479c DT |
107 | /* |
108 | * Generate software autorepeat event. Note that we take | |
109 | * dev->event_lock here to avoid racing with input_event | |
110 | * which may cause keys get "stuck". | |
111 | */ | |
112 | static void input_repeat_key(unsigned long data) | |
113 | { | |
114 | struct input_dev *dev = (void *) data; | |
115 | unsigned long flags; | |
1da177e4 | 116 | |
8006479c | 117 | spin_lock_irqsave(&dev->event_lock, flags); |
1da177e4 | 118 | |
8006479c DT |
119 | if (test_bit(dev->repeat_key, dev->key) && |
120 | is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) { | |
1da177e4 | 121 | |
8006479c | 122 | input_pass_event(dev, EV_KEY, dev->repeat_key, 2); |
1da177e4 | 123 | |
8006479c DT |
124 | if (dev->sync) { |
125 | /* | |
126 | * Only send SYN_REPORT if we are not in a middle | |
127 | * of driver parsing a new hardware packet. | |
128 | * Otherwise assume that the driver will send | |
129 | * SYN_REPORT once it's done. | |
130 | */ | |
131 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
132 | } | |
31581066 | 133 | |
8006479c DT |
134 | if (dev->rep[REP_PERIOD]) |
135 | mod_timer(&dev->timer, jiffies + | |
136 | msecs_to_jiffies(dev->rep[REP_PERIOD])); | |
137 | } | |
31581066 | 138 | |
8006479c DT |
139 | spin_unlock_irqrestore(&dev->event_lock, flags); |
140 | } | |
31581066 | 141 | |
8006479c DT |
142 | static void input_start_autorepeat(struct input_dev *dev, int code) |
143 | { | |
144 | if (test_bit(EV_REP, dev->evbit) && | |
145 | dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && | |
146 | dev->timer.data) { | |
147 | dev->repeat_key = code; | |
148 | mod_timer(&dev->timer, | |
149 | jiffies + msecs_to_jiffies(dev->rep[REP_DELAY])); | |
150 | } | |
151 | } | |
31581066 | 152 | |
e7b5c1ef JB |
153 | static void input_stop_autorepeat(struct input_dev *dev) |
154 | { | |
155 | del_timer(&dev->timer); | |
156 | } | |
157 | ||
8006479c DT |
158 | #define INPUT_IGNORE_EVENT 0 |
159 | #define INPUT_PASS_TO_HANDLERS 1 | |
160 | #define INPUT_PASS_TO_DEVICE 2 | |
161 | #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE) | |
1da177e4 | 162 | |
8006479c DT |
163 | static void input_handle_event(struct input_dev *dev, |
164 | unsigned int type, unsigned int code, int value) | |
165 | { | |
166 | int disposition = INPUT_IGNORE_EVENT; | |
1da177e4 | 167 | |
8006479c | 168 | switch (type) { |
1da177e4 | 169 | |
8006479c DT |
170 | case EV_SYN: |
171 | switch (code) { | |
172 | case SYN_CONFIG: | |
173 | disposition = INPUT_PASS_TO_ALL; | |
174 | break; | |
1da177e4 | 175 | |
8006479c DT |
176 | case SYN_REPORT: |
177 | if (!dev->sync) { | |
178 | dev->sync = 1; | |
179 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 180 | } |
1da177e4 | 181 | break; |
5e5ee686 HR |
182 | case SYN_MT_REPORT: |
183 | dev->sync = 0; | |
184 | disposition = INPUT_PASS_TO_HANDLERS; | |
185 | break; | |
8006479c DT |
186 | } |
187 | break; | |
1da177e4 | 188 | |
8006479c DT |
189 | case EV_KEY: |
190 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
191 | !!test_bit(code, dev->key) != value) { | |
1da177e4 | 192 | |
8006479c DT |
193 | if (value != 2) { |
194 | __change_bit(code, dev->key); | |
195 | if (value) | |
196 | input_start_autorepeat(dev, code); | |
e7b5c1ef JB |
197 | else |
198 | input_stop_autorepeat(dev); | |
8006479c | 199 | } |
1da177e4 | 200 | |
8006479c DT |
201 | disposition = INPUT_PASS_TO_HANDLERS; |
202 | } | |
203 | break; | |
1da177e4 | 204 | |
8006479c DT |
205 | case EV_SW: |
206 | if (is_event_supported(code, dev->swbit, SW_MAX) && | |
207 | !!test_bit(code, dev->sw) != value) { | |
1da177e4 | 208 | |
8006479c DT |
209 | __change_bit(code, dev->sw); |
210 | disposition = INPUT_PASS_TO_HANDLERS; | |
211 | } | |
212 | break; | |
1da177e4 | 213 | |
8006479c DT |
214 | case EV_ABS: |
215 | if (is_event_supported(code, dev->absbit, ABS_MAX)) { | |
1da177e4 | 216 | |
61994a61 HR |
217 | if (test_bit(code, input_abs_bypass)) { |
218 | disposition = INPUT_PASS_TO_HANDLERS; | |
219 | break; | |
220 | } | |
221 | ||
8006479c DT |
222 | value = input_defuzz_abs_event(value, |
223 | dev->abs[code], dev->absfuzz[code]); | |
1da177e4 | 224 | |
8006479c DT |
225 | if (dev->abs[code] != value) { |
226 | dev->abs[code] = value; | |
227 | disposition = INPUT_PASS_TO_HANDLERS; | |
228 | } | |
229 | } | |
230 | break; | |
1da177e4 | 231 | |
8006479c DT |
232 | case EV_REL: |
233 | if (is_event_supported(code, dev->relbit, REL_MAX) && value) | |
234 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 235 | |
8006479c | 236 | break; |
1e0afb28 | 237 | |
8006479c DT |
238 | case EV_MSC: |
239 | if (is_event_supported(code, dev->mscbit, MSC_MAX)) | |
240 | disposition = INPUT_PASS_TO_ALL; | |
1da177e4 | 241 | |
8006479c | 242 | break; |
1da177e4 | 243 | |
8006479c DT |
244 | case EV_LED: |
245 | if (is_event_supported(code, dev->ledbit, LED_MAX) && | |
246 | !!test_bit(code, dev->led) != value) { | |
1da177e4 | 247 | |
8006479c DT |
248 | __change_bit(code, dev->led); |
249 | disposition = INPUT_PASS_TO_ALL; | |
250 | } | |
251 | break; | |
252 | ||
253 | case EV_SND: | |
254 | if (is_event_supported(code, dev->sndbit, SND_MAX)) { | |
1da177e4 | 255 | |
8fdc1948 | 256 | if (!!test_bit(code, dev->snd) != !!value) |
8006479c DT |
257 | __change_bit(code, dev->snd); |
258 | disposition = INPUT_PASS_TO_ALL; | |
259 | } | |
260 | break; | |
8fdc1948 | 261 | |
8006479c DT |
262 | case EV_REP: |
263 | if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) { | |
264 | dev->rep[code] = value; | |
265 | disposition = INPUT_PASS_TO_ALL; | |
266 | } | |
267 | break; | |
1da177e4 | 268 | |
8006479c DT |
269 | case EV_FF: |
270 | if (value >= 0) | |
271 | disposition = INPUT_PASS_TO_ALL; | |
272 | break; | |
ed2fa4dd RP |
273 | |
274 | case EV_PWR: | |
275 | disposition = INPUT_PASS_TO_ALL; | |
276 | break; | |
8006479c | 277 | } |
1da177e4 | 278 | |
c9812282 | 279 | if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN) |
8006479c | 280 | dev->sync = 0; |
1da177e4 | 281 | |
8006479c DT |
282 | if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event) |
283 | dev->event(dev, type, code, value); | |
1da177e4 | 284 | |
8006479c DT |
285 | if (disposition & INPUT_PASS_TO_HANDLERS) |
286 | input_pass_event(dev, type, code, value); | |
287 | } | |
1da177e4 | 288 | |
8006479c DT |
289 | /** |
290 | * input_event() - report new input event | |
291 | * @dev: device that generated the event | |
292 | * @type: type of the event | |
293 | * @code: event code | |
294 | * @value: value of the event | |
295 | * | |
296 | * This function should be used by drivers implementing various input | |
297 | * devices. See also input_inject_event(). | |
298 | */ | |
1da177e4 | 299 | |
8006479c DT |
300 | void input_event(struct input_dev *dev, |
301 | unsigned int type, unsigned int code, int value) | |
302 | { | |
303 | unsigned long flags; | |
509ca1a9 | 304 | |
8006479c | 305 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
509ca1a9 | 306 | |
8006479c DT |
307 | spin_lock_irqsave(&dev->event_lock, flags); |
308 | add_input_randomness(type, code, value); | |
309 | input_handle_event(dev, type, code, value); | |
310 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1da177e4 | 311 | } |
1da177e4 | 312 | } |
ca56fe07 | 313 | EXPORT_SYMBOL(input_event); |
1da177e4 | 314 | |
0e739d28 DT |
315 | /** |
316 | * input_inject_event() - send input event from input handler | |
317 | * @handle: input handle to send event through | |
318 | * @type: type of the event | |
319 | * @code: event code | |
320 | * @value: value of the event | |
321 | * | |
8006479c DT |
322 | * Similar to input_event() but will ignore event if device is |
323 | * "grabbed" and handle injecting event is not the one that owns | |
324 | * the device. | |
0e739d28 | 325 | */ |
8006479c DT |
326 | void input_inject_event(struct input_handle *handle, |
327 | unsigned int type, unsigned int code, int value) | |
1da177e4 | 328 | { |
8006479c DT |
329 | struct input_dev *dev = handle->dev; |
330 | struct input_handle *grab; | |
331 | unsigned long flags; | |
1da177e4 | 332 | |
8006479c DT |
333 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
334 | spin_lock_irqsave(&dev->event_lock, flags); | |
1da177e4 | 335 | |
82ba56c2 | 336 | rcu_read_lock(); |
8006479c DT |
337 | grab = rcu_dereference(dev->grab); |
338 | if (!grab || grab == handle) | |
339 | input_handle_event(dev, type, code, value); | |
82ba56c2 | 340 | rcu_read_unlock(); |
1da177e4 | 341 | |
8006479c DT |
342 | spin_unlock_irqrestore(&dev->event_lock, flags); |
343 | } | |
1da177e4 | 344 | } |
8006479c | 345 | EXPORT_SYMBOL(input_inject_event); |
1da177e4 | 346 | |
8006479c DT |
347 | /** |
348 | * input_grab_device - grabs device for exclusive use | |
349 | * @handle: input handle that wants to own the device | |
350 | * | |
351 | * When a device is grabbed by an input handle all events generated by | |
352 | * the device are delivered only to this handle. Also events injected | |
353 | * by other input handles are ignored while device is grabbed. | |
354 | */ | |
1da177e4 LT |
355 | int input_grab_device(struct input_handle *handle) |
356 | { | |
8006479c DT |
357 | struct input_dev *dev = handle->dev; |
358 | int retval; | |
1da177e4 | 359 | |
8006479c DT |
360 | retval = mutex_lock_interruptible(&dev->mutex); |
361 | if (retval) | |
362 | return retval; | |
363 | ||
364 | if (dev->grab) { | |
365 | retval = -EBUSY; | |
366 | goto out; | |
367 | } | |
368 | ||
369 | rcu_assign_pointer(dev->grab, handle); | |
82ba56c2 | 370 | synchronize_rcu(); |
8006479c DT |
371 | |
372 | out: | |
373 | mutex_unlock(&dev->mutex); | |
374 | return retval; | |
1da177e4 | 375 | } |
ca56fe07 | 376 | EXPORT_SYMBOL(input_grab_device); |
1da177e4 | 377 | |
8006479c | 378 | static void __input_release_device(struct input_handle *handle) |
1da177e4 | 379 | { |
a2b2ed2c | 380 | struct input_dev *dev = handle->dev; |
c7e8dc6e | 381 | |
a2b2ed2c | 382 | if (dev->grab == handle) { |
8006479c DT |
383 | rcu_assign_pointer(dev->grab, NULL); |
384 | /* Make sure input_pass_event() notices that grab is gone */ | |
82ba56c2 | 385 | synchronize_rcu(); |
a2b2ed2c AM |
386 | |
387 | list_for_each_entry(handle, &dev->h_list, d_node) | |
8006479c | 388 | if (handle->open && handle->handler->start) |
c7e8dc6e DT |
389 | handle->handler->start(handle); |
390 | } | |
1da177e4 | 391 | } |
8006479c DT |
392 | |
393 | /** | |
394 | * input_release_device - release previously grabbed device | |
395 | * @handle: input handle that owns the device | |
396 | * | |
397 | * Releases previously grabbed device so that other input handles can | |
398 | * start receiving input events. Upon release all handlers attached | |
399 | * to the device have their start() method called so they have a change | |
400 | * to synchronize device state with the rest of the system. | |
401 | */ | |
402 | void input_release_device(struct input_handle *handle) | |
403 | { | |
404 | struct input_dev *dev = handle->dev; | |
405 | ||
406 | mutex_lock(&dev->mutex); | |
407 | __input_release_device(handle); | |
408 | mutex_unlock(&dev->mutex); | |
409 | } | |
ca56fe07 | 410 | EXPORT_SYMBOL(input_release_device); |
1da177e4 | 411 | |
8006479c DT |
412 | /** |
413 | * input_open_device - open input device | |
414 | * @handle: handle through which device is being accessed | |
415 | * | |
416 | * This function should be called by input handlers when they | |
417 | * want to start receive events from given input device. | |
418 | */ | |
1da177e4 LT |
419 | int input_open_device(struct input_handle *handle) |
420 | { | |
0fbf87ca | 421 | struct input_dev *dev = handle->dev; |
8006479c | 422 | int retval; |
0fbf87ca | 423 | |
8006479c DT |
424 | retval = mutex_lock_interruptible(&dev->mutex); |
425 | if (retval) | |
426 | return retval; | |
427 | ||
428 | if (dev->going_away) { | |
429 | retval = -ENODEV; | |
430 | goto out; | |
431 | } | |
0fbf87ca | 432 | |
1da177e4 | 433 | handle->open++; |
0fbf87ca DT |
434 | |
435 | if (!dev->users++ && dev->open) | |
8006479c DT |
436 | retval = dev->open(dev); |
437 | ||
438 | if (retval) { | |
439 | dev->users--; | |
440 | if (!--handle->open) { | |
441 | /* | |
442 | * Make sure we are not delivering any more events | |
443 | * through this handle | |
444 | */ | |
82ba56c2 | 445 | synchronize_rcu(); |
8006479c DT |
446 | } |
447 | } | |
0fbf87ca | 448 | |
8006479c | 449 | out: |
e676c232 | 450 | mutex_unlock(&dev->mutex); |
8006479c | 451 | return retval; |
1da177e4 | 452 | } |
ca56fe07 | 453 | EXPORT_SYMBOL(input_open_device); |
1da177e4 | 454 | |
8006479c | 455 | int input_flush_device(struct input_handle *handle, struct file *file) |
1da177e4 | 456 | { |
8006479c DT |
457 | struct input_dev *dev = handle->dev; |
458 | int retval; | |
1da177e4 | 459 | |
8006479c DT |
460 | retval = mutex_lock_interruptible(&dev->mutex); |
461 | if (retval) | |
462 | return retval; | |
463 | ||
464 | if (dev->flush) | |
465 | retval = dev->flush(dev, file); | |
466 | ||
467 | mutex_unlock(&dev->mutex); | |
468 | return retval; | |
1da177e4 | 469 | } |
ca56fe07 | 470 | EXPORT_SYMBOL(input_flush_device); |
1da177e4 | 471 | |
8006479c DT |
472 | /** |
473 | * input_close_device - close input device | |
474 | * @handle: handle through which device is being accessed | |
475 | * | |
476 | * This function should be called by input handlers when they | |
477 | * want to stop receive events from given input device. | |
478 | */ | |
1da177e4 LT |
479 | void input_close_device(struct input_handle *handle) |
480 | { | |
0fbf87ca DT |
481 | struct input_dev *dev = handle->dev; |
482 | ||
e676c232 | 483 | mutex_lock(&dev->mutex); |
0fbf87ca | 484 | |
8006479c DT |
485 | __input_release_device(handle); |
486 | ||
0fbf87ca DT |
487 | if (!--dev->users && dev->close) |
488 | dev->close(dev); | |
8006479c DT |
489 | |
490 | if (!--handle->open) { | |
491 | /* | |
82ba56c2 | 492 | * synchronize_rcu() makes sure that input_pass_event() |
8006479c DT |
493 | * completed and that no more input events are delivered |
494 | * through this handle | |
495 | */ | |
82ba56c2 | 496 | synchronize_rcu(); |
8006479c | 497 | } |
0fbf87ca | 498 | |
e676c232 | 499 | mutex_unlock(&dev->mutex); |
1da177e4 | 500 | } |
ca56fe07 | 501 | EXPORT_SYMBOL(input_close_device); |
1da177e4 | 502 | |
8006479c DT |
503 | /* |
504 | * Prepare device for unregistering | |
505 | */ | |
506 | static void input_disconnect_device(struct input_dev *dev) | |
507 | { | |
508 | struct input_handle *handle; | |
509 | int code; | |
510 | ||
511 | /* | |
512 | * Mark device as going away. Note that we take dev->mutex here | |
513 | * not to protect access to dev->going_away but rather to ensure | |
514 | * that there are no threads in the middle of input_open_device() | |
515 | */ | |
516 | mutex_lock(&dev->mutex); | |
517 | dev->going_away = 1; | |
518 | mutex_unlock(&dev->mutex); | |
519 | ||
520 | spin_lock_irq(&dev->event_lock); | |
521 | ||
522 | /* | |
523 | * Simulate keyup events for all pressed keys so that handlers | |
524 | * are not left with "stuck" keys. The driver may continue | |
525 | * generate events even after we done here but they will not | |
526 | * reach any handlers. | |
527 | */ | |
528 | if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) { | |
529 | for (code = 0; code <= KEY_MAX; code++) { | |
530 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
f4f37c8e | 531 | __test_and_clear_bit(code, dev->key)) { |
8006479c DT |
532 | input_pass_event(dev, EV_KEY, code, 0); |
533 | } | |
534 | } | |
535 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
536 | } | |
537 | ||
538 | list_for_each_entry(handle, &dev->h_list, d_node) | |
539 | handle->open = 0; | |
540 | ||
541 | spin_unlock_irq(&dev->event_lock); | |
542 | } | |
543 | ||
c8e4c772 MR |
544 | static int input_fetch_keycode(struct input_dev *dev, int scancode) |
545 | { | |
546 | switch (dev->keycodesize) { | |
547 | case 1: | |
548 | return ((u8 *)dev->keycode)[scancode]; | |
549 | ||
550 | case 2: | |
551 | return ((u16 *)dev->keycode)[scancode]; | |
552 | ||
553 | default: | |
554 | return ((u32 *)dev->keycode)[scancode]; | |
555 | } | |
556 | } | |
557 | ||
558 | static int input_default_getkeycode(struct input_dev *dev, | |
559 | int scancode, int *keycode) | |
560 | { | |
561 | if (!dev->keycodesize) | |
562 | return -EINVAL; | |
563 | ||
f4f37c8e | 564 | if (scancode >= dev->keycodemax) |
c8e4c772 MR |
565 | return -EINVAL; |
566 | ||
567 | *keycode = input_fetch_keycode(dev, scancode); | |
568 | ||
569 | return 0; | |
570 | } | |
571 | ||
572 | static int input_default_setkeycode(struct input_dev *dev, | |
573 | int scancode, int keycode) | |
574 | { | |
575 | int old_keycode; | |
576 | int i; | |
577 | ||
f4f37c8e | 578 | if (scancode >= dev->keycodemax) |
c8e4c772 MR |
579 | return -EINVAL; |
580 | ||
581 | if (!dev->keycodesize) | |
582 | return -EINVAL; | |
583 | ||
584 | if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8))) | |
585 | return -EINVAL; | |
586 | ||
587 | switch (dev->keycodesize) { | |
588 | case 1: { | |
589 | u8 *k = (u8 *)dev->keycode; | |
590 | old_keycode = k[scancode]; | |
591 | k[scancode] = keycode; | |
592 | break; | |
593 | } | |
594 | case 2: { | |
595 | u16 *k = (u16 *)dev->keycode; | |
596 | old_keycode = k[scancode]; | |
597 | k[scancode] = keycode; | |
598 | break; | |
599 | } | |
600 | default: { | |
601 | u32 *k = (u32 *)dev->keycode; | |
602 | old_keycode = k[scancode]; | |
603 | k[scancode] = keycode; | |
604 | break; | |
605 | } | |
606 | } | |
607 | ||
608 | clear_bit(old_keycode, dev->keybit); | |
609 | set_bit(keycode, dev->keybit); | |
610 | ||
611 | for (i = 0; i < dev->keycodemax; i++) { | |
612 | if (input_fetch_keycode(dev, i) == old_keycode) { | |
613 | set_bit(old_keycode, dev->keybit); | |
614 | break; /* Setting the bit twice is useless, so break */ | |
615 | } | |
616 | } | |
617 | ||
618 | return 0; | |
619 | } | |
620 | ||
f4f37c8e DT |
621 | /** |
622 | * input_get_keycode - retrieve keycode currently mapped to a given scancode | |
623 | * @dev: input device which keymap is being queried | |
624 | * @scancode: scancode (or its equivalent for device in question) for which | |
625 | * keycode is needed | |
626 | * @keycode: result | |
627 | * | |
628 | * This function should be called by anyone interested in retrieving current | |
629 | * keymap. Presently keyboard and evdev handlers use it. | |
630 | */ | |
631 | int input_get_keycode(struct input_dev *dev, int scancode, int *keycode) | |
632 | { | |
633 | if (scancode < 0) | |
634 | return -EINVAL; | |
635 | ||
636 | return dev->getkeycode(dev, scancode, keycode); | |
637 | } | |
638 | EXPORT_SYMBOL(input_get_keycode); | |
639 | ||
640 | /** | |
641 | * input_get_keycode - assign new keycode to a given scancode | |
642 | * @dev: input device which keymap is being updated | |
643 | * @scancode: scancode (or its equivalent for device in question) | |
644 | * @keycode: new keycode to be assigned to the scancode | |
645 | * | |
646 | * This function should be called by anyone needing to update current | |
647 | * keymap. Presently keyboard and evdev handlers use it. | |
648 | */ | |
649 | int input_set_keycode(struct input_dev *dev, int scancode, int keycode) | |
650 | { | |
651 | unsigned long flags; | |
652 | int old_keycode; | |
653 | int retval; | |
654 | ||
655 | if (scancode < 0) | |
656 | return -EINVAL; | |
657 | ||
658 | if (keycode < 0 || keycode > KEY_MAX) | |
659 | return -EINVAL; | |
660 | ||
661 | spin_lock_irqsave(&dev->event_lock, flags); | |
662 | ||
663 | retval = dev->getkeycode(dev, scancode, &old_keycode); | |
664 | if (retval) | |
665 | goto out; | |
666 | ||
667 | retval = dev->setkeycode(dev, scancode, keycode); | |
668 | if (retval) | |
669 | goto out; | |
670 | ||
671 | /* | |
672 | * Simulate keyup event if keycode is not present | |
673 | * in the keymap anymore | |
674 | */ | |
675 | if (test_bit(EV_KEY, dev->evbit) && | |
676 | !is_event_supported(old_keycode, dev->keybit, KEY_MAX) && | |
677 | __test_and_clear_bit(old_keycode, dev->key)) { | |
678 | ||
679 | input_pass_event(dev, EV_KEY, old_keycode, 0); | |
680 | if (dev->sync) | |
681 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
682 | } | |
683 | ||
684 | out: | |
685 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
686 | ||
687 | return retval; | |
688 | } | |
689 | EXPORT_SYMBOL(input_set_keycode); | |
c8e4c772 | 690 | |
1da177e4 | 691 | #define MATCH_BIT(bit, max) \ |
7b19ada2 | 692 | for (i = 0; i < BITS_TO_LONGS(max); i++) \ |
1da177e4 LT |
693 | if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \ |
694 | break; \ | |
7b19ada2 | 695 | if (i != BITS_TO_LONGS(max)) \ |
1da177e4 LT |
696 | continue; |
697 | ||
66e66118 DT |
698 | static const struct input_device_id *input_match_device(const struct input_device_id *id, |
699 | struct input_dev *dev) | |
1da177e4 LT |
700 | { |
701 | int i; | |
702 | ||
703 | for (; id->flags || id->driver_info; id++) { | |
704 | ||
705 | if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) | |
ddc5d341 | 706 | if (id->bustype != dev->id.bustype) |
1da177e4 LT |
707 | continue; |
708 | ||
709 | if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) | |
ddc5d341 | 710 | if (id->vendor != dev->id.vendor) |
1da177e4 LT |
711 | continue; |
712 | ||
713 | if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) | |
ddc5d341 | 714 | if (id->product != dev->id.product) |
1da177e4 LT |
715 | continue; |
716 | ||
717 | if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) | |
ddc5d341 | 718 | if (id->version != dev->id.version) |
1da177e4 LT |
719 | continue; |
720 | ||
721 | MATCH_BIT(evbit, EV_MAX); | |
722 | MATCH_BIT(keybit, KEY_MAX); | |
723 | MATCH_BIT(relbit, REL_MAX); | |
724 | MATCH_BIT(absbit, ABS_MAX); | |
725 | MATCH_BIT(mscbit, MSC_MAX); | |
726 | MATCH_BIT(ledbit, LED_MAX); | |
727 | MATCH_BIT(sndbit, SND_MAX); | |
728 | MATCH_BIT(ffbit, FF_MAX); | |
ff13f98b | 729 | MATCH_BIT(swbit, SW_MAX); |
1da177e4 LT |
730 | |
731 | return id; | |
732 | } | |
733 | ||
734 | return NULL; | |
735 | } | |
736 | ||
5b2a0826 DT |
737 | static int input_attach_handler(struct input_dev *dev, struct input_handler *handler) |
738 | { | |
739 | const struct input_device_id *id; | |
740 | int error; | |
741 | ||
742 | if (handler->blacklist && input_match_device(handler->blacklist, dev)) | |
743 | return -ENODEV; | |
744 | ||
745 | id = input_match_device(handler->id_table, dev); | |
746 | if (!id) | |
747 | return -ENODEV; | |
748 | ||
749 | error = handler->connect(handler, dev, id); | |
750 | if (error && error != -ENODEV) | |
751 | printk(KERN_ERR | |
752 | "input: failed to attach handler %s to device %s, " | |
753 | "error: %d\n", | |
9657d75c | 754 | handler->name, kobject_name(&dev->dev.kobj), error); |
5b2a0826 DT |
755 | |
756 | return error; | |
757 | } | |
758 | ||
759 | ||
f96b434d DT |
760 | #ifdef CONFIG_PROC_FS |
761 | ||
762 | static struct proc_dir_entry *proc_bus_input_dir; | |
763 | static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); | |
764 | static int input_devices_state; | |
765 | ||
766 | static inline void input_wakeup_procfs_readers(void) | |
767 | { | |
768 | input_devices_state++; | |
769 | wake_up(&input_devices_poll_wait); | |
770 | } | |
771 | ||
969b21cd | 772 | static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait) |
f96b434d | 773 | { |
f96b434d | 774 | poll_wait(file, &input_devices_poll_wait, wait); |
fa886612 DT |
775 | if (file->f_version != input_devices_state) { |
776 | file->f_version = input_devices_state; | |
f96b434d | 777 | return POLLIN | POLLRDNORM; |
fa886612 | 778 | } |
1e0afb28 | 779 | |
f96b434d DT |
780 | return 0; |
781 | } | |
782 | ||
969b21cd DT |
783 | static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) |
784 | { | |
8006479c DT |
785 | if (mutex_lock_interruptible(&input_mutex)) |
786 | return NULL; | |
f96b434d | 787 | |
ad5d972c | 788 | return seq_list_start(&input_dev_list, *pos); |
969b21cd | 789 | } |
051b2fea | 790 | |
969b21cd DT |
791 | static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
792 | { | |
ad5d972c | 793 | return seq_list_next(v, &input_dev_list, pos); |
969b21cd | 794 | } |
f96b434d | 795 | |
969b21cd DT |
796 | static void input_devices_seq_stop(struct seq_file *seq, void *v) |
797 | { | |
8006479c | 798 | mutex_unlock(&input_mutex); |
969b21cd | 799 | } |
f96b434d | 800 | |
969b21cd DT |
801 | static void input_seq_print_bitmap(struct seq_file *seq, const char *name, |
802 | unsigned long *bitmap, int max) | |
803 | { | |
804 | int i; | |
051b2fea | 805 | |
7b19ada2 | 806 | for (i = BITS_TO_LONGS(max) - 1; i > 0; i--) |
969b21cd DT |
807 | if (bitmap[i]) |
808 | break; | |
f96b434d | 809 | |
969b21cd DT |
810 | seq_printf(seq, "B: %s=", name); |
811 | for (; i >= 0; i--) | |
812 | seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : ""); | |
813 | seq_putc(seq, '\n'); | |
814 | } | |
f96b434d | 815 | |
969b21cd DT |
816 | static int input_devices_seq_show(struct seq_file *seq, void *v) |
817 | { | |
818 | struct input_dev *dev = container_of(v, struct input_dev, node); | |
9657d75c | 819 | const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
969b21cd DT |
820 | struct input_handle *handle; |
821 | ||
822 | seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", | |
823 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); | |
824 | ||
825 | seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); | |
826 | seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : ""); | |
827 | seq_printf(seq, "S: Sysfs=%s\n", path ? path : ""); | |
15e03ae8 | 828 | seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : ""); |
969b21cd DT |
829 | seq_printf(seq, "H: Handlers="); |
830 | ||
831 | list_for_each_entry(handle, &dev->h_list, d_node) | |
832 | seq_printf(seq, "%s ", handle->name); | |
833 | seq_putc(seq, '\n'); | |
834 | ||
835 | input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); | |
836 | if (test_bit(EV_KEY, dev->evbit)) | |
837 | input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); | |
838 | if (test_bit(EV_REL, dev->evbit)) | |
839 | input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); | |
840 | if (test_bit(EV_ABS, dev->evbit)) | |
841 | input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); | |
842 | if (test_bit(EV_MSC, dev->evbit)) | |
843 | input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); | |
844 | if (test_bit(EV_LED, dev->evbit)) | |
845 | input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); | |
846 | if (test_bit(EV_SND, dev->evbit)) | |
847 | input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); | |
848 | if (test_bit(EV_FF, dev->evbit)) | |
849 | input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); | |
850 | if (test_bit(EV_SW, dev->evbit)) | |
851 | input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); | |
852 | ||
853 | seq_putc(seq, '\n'); | |
854 | ||
855 | kfree(path); | |
856 | return 0; | |
f96b434d DT |
857 | } |
858 | ||
cec69c37 | 859 | static const struct seq_operations input_devices_seq_ops = { |
969b21cd DT |
860 | .start = input_devices_seq_start, |
861 | .next = input_devices_seq_next, | |
862 | .stop = input_devices_seq_stop, | |
863 | .show = input_devices_seq_show, | |
864 | }; | |
865 | ||
866 | static int input_proc_devices_open(struct inode *inode, struct file *file) | |
f96b434d | 867 | { |
969b21cd DT |
868 | return seq_open(file, &input_devices_seq_ops); |
869 | } | |
870 | ||
2b8693c0 | 871 | static const struct file_operations input_devices_fileops = { |
969b21cd DT |
872 | .owner = THIS_MODULE, |
873 | .open = input_proc_devices_open, | |
874 | .poll = input_proc_devices_poll, | |
875 | .read = seq_read, | |
876 | .llseek = seq_lseek, | |
877 | .release = seq_release, | |
878 | }; | |
879 | ||
880 | static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) | |
881 | { | |
8006479c DT |
882 | if (mutex_lock_interruptible(&input_mutex)) |
883 | return NULL; | |
884 | ||
969b21cd | 885 | seq->private = (void *)(unsigned long)*pos; |
ad5d972c | 886 | return seq_list_start(&input_handler_list, *pos); |
969b21cd | 887 | } |
f96b434d | 888 | |
969b21cd DT |
889 | static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
890 | { | |
891 | seq->private = (void *)(unsigned long)(*pos + 1); | |
ad5d972c | 892 | return seq_list_next(v, &input_handler_list, pos); |
f96b434d DT |
893 | } |
894 | ||
969b21cd DT |
895 | static void input_handlers_seq_stop(struct seq_file *seq, void *v) |
896 | { | |
8006479c | 897 | mutex_unlock(&input_mutex); |
969b21cd DT |
898 | } |
899 | ||
900 | static int input_handlers_seq_show(struct seq_file *seq, void *v) | |
901 | { | |
902 | struct input_handler *handler = container_of(v, struct input_handler, node); | |
903 | ||
904 | seq_printf(seq, "N: Number=%ld Name=%s", | |
905 | (unsigned long)seq->private, handler->name); | |
906 | if (handler->fops) | |
907 | seq_printf(seq, " Minor=%d", handler->minor); | |
908 | seq_putc(seq, '\n'); | |
909 | ||
910 | return 0; | |
911 | } | |
cec69c37 | 912 | static const struct seq_operations input_handlers_seq_ops = { |
969b21cd DT |
913 | .start = input_handlers_seq_start, |
914 | .next = input_handlers_seq_next, | |
915 | .stop = input_handlers_seq_stop, | |
916 | .show = input_handlers_seq_show, | |
917 | }; | |
918 | ||
919 | static int input_proc_handlers_open(struct inode *inode, struct file *file) | |
920 | { | |
921 | return seq_open(file, &input_handlers_seq_ops); | |
922 | } | |
923 | ||
2b8693c0 | 924 | static const struct file_operations input_handlers_fileops = { |
969b21cd DT |
925 | .owner = THIS_MODULE, |
926 | .open = input_proc_handlers_open, | |
927 | .read = seq_read, | |
928 | .llseek = seq_lseek, | |
929 | .release = seq_release, | |
930 | }; | |
f96b434d DT |
931 | |
932 | static int __init input_proc_init(void) | |
933 | { | |
934 | struct proc_dir_entry *entry; | |
935 | ||
9c37066d | 936 | proc_bus_input_dir = proc_mkdir("bus/input", NULL); |
f96b434d DT |
937 | if (!proc_bus_input_dir) |
938 | return -ENOMEM; | |
939 | ||
c7705f34 DL |
940 | entry = proc_create("devices", 0, proc_bus_input_dir, |
941 | &input_devices_fileops); | |
f96b434d DT |
942 | if (!entry) |
943 | goto fail1; | |
944 | ||
c7705f34 DL |
945 | entry = proc_create("handlers", 0, proc_bus_input_dir, |
946 | &input_handlers_fileops); | |
f96b434d DT |
947 | if (!entry) |
948 | goto fail2; | |
949 | ||
f96b434d DT |
950 | return 0; |
951 | ||
952 | fail2: remove_proc_entry("devices", proc_bus_input_dir); | |
9c37066d | 953 | fail1: remove_proc_entry("bus/input", NULL); |
f96b434d DT |
954 | return -ENOMEM; |
955 | } | |
956 | ||
beffbdc2 | 957 | static void input_proc_exit(void) |
f96b434d DT |
958 | { |
959 | remove_proc_entry("devices", proc_bus_input_dir); | |
960 | remove_proc_entry("handlers", proc_bus_input_dir); | |
9c37066d | 961 | remove_proc_entry("bus/input", NULL); |
f96b434d DT |
962 | } |
963 | ||
964 | #else /* !CONFIG_PROC_FS */ | |
965 | static inline void input_wakeup_procfs_readers(void) { } | |
966 | static inline int input_proc_init(void) { return 0; } | |
967 | static inline void input_proc_exit(void) { } | |
968 | #endif | |
969 | ||
9657d75c DT |
970 | #define INPUT_DEV_STRING_ATTR_SHOW(name) \ |
971 | static ssize_t input_dev_show_##name(struct device *dev, \ | |
972 | struct device_attribute *attr, \ | |
973 | char *buf) \ | |
974 | { \ | |
975 | struct input_dev *input_dev = to_input_dev(dev); \ | |
976 | \ | |
977 | return scnprintf(buf, PAGE_SIZE, "%s\n", \ | |
978 | input_dev->name ? input_dev->name : ""); \ | |
979 | } \ | |
980 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL) | |
5c1e9a6a DT |
981 | |
982 | INPUT_DEV_STRING_ATTR_SHOW(name); | |
983 | INPUT_DEV_STRING_ATTR_SHOW(phys); | |
984 | INPUT_DEV_STRING_ATTR_SHOW(uniq); | |
985 | ||
ac648a6a DT |
986 | static int input_print_modalias_bits(char *buf, int size, |
987 | char name, unsigned long *bm, | |
988 | unsigned int min_bit, unsigned int max_bit) | |
1d8f430c | 989 | { |
ac648a6a | 990 | int len = 0, i; |
1d8f430c | 991 | |
ac648a6a DT |
992 | len += snprintf(buf, max(size, 0), "%c", name); |
993 | for (i = min_bit; i < max_bit; i++) | |
7b19ada2 | 994 | if (bm[BIT_WORD(i)] & BIT_MASK(i)) |
ac648a6a | 995 | len += snprintf(buf + len, max(size - len, 0), "%X,", i); |
1d8f430c RR |
996 | return len; |
997 | } | |
998 | ||
2db66876 DT |
999 | static int input_print_modalias(char *buf, int size, struct input_dev *id, |
1000 | int add_cr) | |
1d8f430c | 1001 | { |
bd37e5a9 | 1002 | int len; |
1d8f430c | 1003 | |
ac648a6a DT |
1004 | len = snprintf(buf, max(size, 0), |
1005 | "input:b%04Xv%04Xp%04Xe%04X-", | |
1006 | id->id.bustype, id->id.vendor, | |
1007 | id->id.product, id->id.version); | |
1008 | ||
1009 | len += input_print_modalias_bits(buf + len, size - len, | |
1010 | 'e', id->evbit, 0, EV_MAX); | |
1011 | len += input_print_modalias_bits(buf + len, size - len, | |
1012 | 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); | |
1013 | len += input_print_modalias_bits(buf + len, size - len, | |
1014 | 'r', id->relbit, 0, REL_MAX); | |
1015 | len += input_print_modalias_bits(buf + len, size - len, | |
1016 | 'a', id->absbit, 0, ABS_MAX); | |
1017 | len += input_print_modalias_bits(buf + len, size - len, | |
1018 | 'm', id->mscbit, 0, MSC_MAX); | |
1019 | len += input_print_modalias_bits(buf + len, size - len, | |
1020 | 'l', id->ledbit, 0, LED_MAX); | |
1021 | len += input_print_modalias_bits(buf + len, size - len, | |
1022 | 's', id->sndbit, 0, SND_MAX); | |
1023 | len += input_print_modalias_bits(buf + len, size - len, | |
1024 | 'f', id->ffbit, 0, FF_MAX); | |
1025 | len += input_print_modalias_bits(buf + len, size - len, | |
1026 | 'w', id->swbit, 0, SW_MAX); | |
2db66876 DT |
1027 | |
1028 | if (add_cr) | |
ac648a6a | 1029 | len += snprintf(buf + len, max(size - len, 0), "\n"); |
2db66876 | 1030 | |
bd37e5a9 KS |
1031 | return len; |
1032 | } | |
1033 | ||
9657d75c DT |
1034 | static ssize_t input_dev_show_modalias(struct device *dev, |
1035 | struct device_attribute *attr, | |
1036 | char *buf) | |
bd37e5a9 KS |
1037 | { |
1038 | struct input_dev *id = to_input_dev(dev); | |
1039 | ssize_t len; | |
1040 | ||
2db66876 DT |
1041 | len = input_print_modalias(buf, PAGE_SIZE, id, 1); |
1042 | ||
8a3cf456 | 1043 | return min_t(int, len, PAGE_SIZE); |
1d8f430c | 1044 | } |
9657d75c | 1045 | static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); |
1d8f430c | 1046 | |
629b77a4 | 1047 | static struct attribute *input_dev_attrs[] = { |
9657d75c DT |
1048 | &dev_attr_name.attr, |
1049 | &dev_attr_phys.attr, | |
1050 | &dev_attr_uniq.attr, | |
1051 | &dev_attr_modalias.attr, | |
629b77a4 GKH |
1052 | NULL |
1053 | }; | |
1054 | ||
bd0ef235 | 1055 | static struct attribute_group input_dev_attr_group = { |
629b77a4 | 1056 | .attrs = input_dev_attrs, |
5c1e9a6a DT |
1057 | }; |
1058 | ||
9657d75c DT |
1059 | #define INPUT_DEV_ID_ATTR(name) \ |
1060 | static ssize_t input_dev_show_id_##name(struct device *dev, \ | |
1061 | struct device_attribute *attr, \ | |
1062 | char *buf) \ | |
1063 | { \ | |
1064 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1065 | return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \ | |
1066 | } \ | |
1067 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL) | |
5c1e9a6a DT |
1068 | |
1069 | INPUT_DEV_ID_ATTR(bustype); | |
1070 | INPUT_DEV_ID_ATTR(vendor); | |
1071 | INPUT_DEV_ID_ATTR(product); | |
1072 | INPUT_DEV_ID_ATTR(version); | |
1073 | ||
1074 | static struct attribute *input_dev_id_attrs[] = { | |
9657d75c DT |
1075 | &dev_attr_bustype.attr, |
1076 | &dev_attr_vendor.attr, | |
1077 | &dev_attr_product.attr, | |
1078 | &dev_attr_version.attr, | |
5c1e9a6a DT |
1079 | NULL |
1080 | }; | |
1081 | ||
1082 | static struct attribute_group input_dev_id_attr_group = { | |
1083 | .name = "id", | |
1084 | .attrs = input_dev_id_attrs, | |
1085 | }; | |
1086 | ||
969b21cd DT |
1087 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1088 | int max, int add_cr) | |
1089 | { | |
1090 | int i; | |
1091 | int len = 0; | |
1092 | ||
7b19ada2 | 1093 | for (i = BITS_TO_LONGS(max) - 1; i > 0; i--) |
969b21cd DT |
1094 | if (bitmap[i]) |
1095 | break; | |
1096 | ||
1097 | for (; i >= 0; i--) | |
1098 | len += snprintf(buf + len, max(buf_size - len, 0), | |
1099 | "%lx%s", bitmap[i], i > 0 ? " " : ""); | |
1100 | ||
1101 | if (add_cr) | |
1102 | len += snprintf(buf + len, max(buf_size - len, 0), "\n"); | |
1103 | ||
1104 | return len; | |
1105 | } | |
1106 | ||
9657d75c DT |
1107 | #define INPUT_DEV_CAP_ATTR(ev, bm) \ |
1108 | static ssize_t input_dev_show_cap_##bm(struct device *dev, \ | |
1109 | struct device_attribute *attr, \ | |
1110 | char *buf) \ | |
1111 | { \ | |
1112 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1113 | int len = input_print_bitmap(buf, PAGE_SIZE, \ | |
1114 | input_dev->bm##bit, ev##_MAX, 1); \ | |
1115 | return min_t(int, len, PAGE_SIZE); \ | |
1116 | } \ | |
1117 | static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL) | |
5c1e9a6a DT |
1118 | |
1119 | INPUT_DEV_CAP_ATTR(EV, ev); | |
1120 | INPUT_DEV_CAP_ATTR(KEY, key); | |
1121 | INPUT_DEV_CAP_ATTR(REL, rel); | |
1122 | INPUT_DEV_CAP_ATTR(ABS, abs); | |
1123 | INPUT_DEV_CAP_ATTR(MSC, msc); | |
1124 | INPUT_DEV_CAP_ATTR(LED, led); | |
1125 | INPUT_DEV_CAP_ATTR(SND, snd); | |
1126 | INPUT_DEV_CAP_ATTR(FF, ff); | |
1127 | INPUT_DEV_CAP_ATTR(SW, sw); | |
1128 | ||
1129 | static struct attribute *input_dev_caps_attrs[] = { | |
9657d75c DT |
1130 | &dev_attr_ev.attr, |
1131 | &dev_attr_key.attr, | |
1132 | &dev_attr_rel.attr, | |
1133 | &dev_attr_abs.attr, | |
1134 | &dev_attr_msc.attr, | |
1135 | &dev_attr_led.attr, | |
1136 | &dev_attr_snd.attr, | |
1137 | &dev_attr_ff.attr, | |
1138 | &dev_attr_sw.attr, | |
5c1e9a6a DT |
1139 | NULL |
1140 | }; | |
1141 | ||
1142 | static struct attribute_group input_dev_caps_attr_group = { | |
1143 | .name = "capabilities", | |
1144 | .attrs = input_dev_caps_attrs, | |
1145 | }; | |
1146 | ||
a4dbd674 | 1147 | static const struct attribute_group *input_dev_attr_groups[] = { |
cb9def4d DT |
1148 | &input_dev_attr_group, |
1149 | &input_dev_id_attr_group, | |
1150 | &input_dev_caps_attr_group, | |
1151 | NULL | |
1152 | }; | |
1153 | ||
9657d75c | 1154 | static void input_dev_release(struct device *device) |
d19fbe8a | 1155 | { |
9657d75c | 1156 | struct input_dev *dev = to_input_dev(device); |
d19fbe8a | 1157 | |
509ca1a9 | 1158 | input_ff_destroy(dev); |
d19fbe8a | 1159 | kfree(dev); |
509ca1a9 | 1160 | |
d19fbe8a DT |
1161 | module_put(THIS_MODULE); |
1162 | } | |
1163 | ||
a7fadbe1 | 1164 | /* |
312c004d | 1165 | * Input uevent interface - loading event handlers based on |
a7fadbe1 DT |
1166 | * device bitfields. |
1167 | */ | |
7eff2e7a | 1168 | static int input_add_uevent_bm_var(struct kobj_uevent_env *env, |
ac648a6a | 1169 | const char *name, unsigned long *bitmap, int max) |
a7fadbe1 | 1170 | { |
7eff2e7a | 1171 | int len; |
a7fadbe1 | 1172 | |
7eff2e7a | 1173 | if (add_uevent_var(env, "%s=", name)) |
a7fadbe1 DT |
1174 | return -ENOMEM; |
1175 | ||
7eff2e7a KS |
1176 | len = input_print_bitmap(&env->buf[env->buflen - 1], |
1177 | sizeof(env->buf) - env->buflen, | |
1178 | bitmap, max, 0); | |
1179 | if (len >= (sizeof(env->buf) - env->buflen)) | |
a7fadbe1 DT |
1180 | return -ENOMEM; |
1181 | ||
7eff2e7a | 1182 | env->buflen += len; |
a7fadbe1 DT |
1183 | return 0; |
1184 | } | |
1185 | ||
7eff2e7a | 1186 | static int input_add_uevent_modalias_var(struct kobj_uevent_env *env, |
ac648a6a DT |
1187 | struct input_dev *dev) |
1188 | { | |
7eff2e7a | 1189 | int len; |
ac648a6a | 1190 | |
7eff2e7a | 1191 | if (add_uevent_var(env, "MODALIAS=")) |
ac648a6a DT |
1192 | return -ENOMEM; |
1193 | ||
7eff2e7a KS |
1194 | len = input_print_modalias(&env->buf[env->buflen - 1], |
1195 | sizeof(env->buf) - env->buflen, | |
1196 | dev, 0); | |
1197 | if (len >= (sizeof(env->buf) - env->buflen)) | |
ac648a6a DT |
1198 | return -ENOMEM; |
1199 | ||
7eff2e7a | 1200 | env->buflen += len; |
ac648a6a DT |
1201 | return 0; |
1202 | } | |
1203 | ||
a7fadbe1 DT |
1204 | #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \ |
1205 | do { \ | |
7eff2e7a | 1206 | int err = add_uevent_var(env, fmt, val); \ |
a7fadbe1 DT |
1207 | if (err) \ |
1208 | return err; \ | |
1209 | } while (0) | |
1210 | ||
1211 | #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \ | |
1212 | do { \ | |
7eff2e7a | 1213 | int err = input_add_uevent_bm_var(env, name, bm, max); \ |
a7fadbe1 DT |
1214 | if (err) \ |
1215 | return err; \ | |
1216 | } while (0) | |
1217 | ||
ac648a6a DT |
1218 | #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \ |
1219 | do { \ | |
7eff2e7a | 1220 | int err = input_add_uevent_modalias_var(env, dev); \ |
ac648a6a DT |
1221 | if (err) \ |
1222 | return err; \ | |
1223 | } while (0) | |
1224 | ||
7eff2e7a | 1225 | static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env) |
a7fadbe1 | 1226 | { |
9657d75c | 1227 | struct input_dev *dev = to_input_dev(device); |
a7fadbe1 DT |
1228 | |
1229 | INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x", | |
1230 | dev->id.bustype, dev->id.vendor, | |
1231 | dev->id.product, dev->id.version); | |
1232 | if (dev->name) | |
1233 | INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); | |
1234 | if (dev->phys) | |
1235 | INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); | |
08de1f04 | 1236 | if (dev->uniq) |
a7fadbe1 DT |
1237 | INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); |
1238 | ||
1239 | INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX); | |
1240 | if (test_bit(EV_KEY, dev->evbit)) | |
1241 | INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX); | |
1242 | if (test_bit(EV_REL, dev->evbit)) | |
1243 | INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX); | |
1244 | if (test_bit(EV_ABS, dev->evbit)) | |
1245 | INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX); | |
1246 | if (test_bit(EV_MSC, dev->evbit)) | |
1247 | INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX); | |
1248 | if (test_bit(EV_LED, dev->evbit)) | |
1249 | INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX); | |
1250 | if (test_bit(EV_SND, dev->evbit)) | |
1251 | INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX); | |
1252 | if (test_bit(EV_FF, dev->evbit)) | |
1253 | INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX); | |
1254 | if (test_bit(EV_SW, dev->evbit)) | |
1255 | INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); | |
1256 | ||
ac648a6a | 1257 | INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); |
a7fadbe1 DT |
1258 | |
1259 | return 0; | |
1260 | } | |
1261 | ||
9657d75c DT |
1262 | static struct device_type input_dev_type = { |
1263 | .groups = input_dev_attr_groups, | |
1264 | .release = input_dev_release, | |
1265 | .uevent = input_dev_uevent, | |
1266 | }; | |
1267 | ||
aa5ed63e KS |
1268 | static char *input_nodename(struct device *dev) |
1269 | { | |
1270 | return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev)); | |
1271 | } | |
1272 | ||
ea9f240b | 1273 | struct class input_class = { |
9657d75c | 1274 | .name = "input", |
aa5ed63e | 1275 | .nodename = input_nodename, |
d19fbe8a | 1276 | }; |
ca56fe07 | 1277 | EXPORT_SYMBOL_GPL(input_class); |
d19fbe8a | 1278 | |
1447190e DT |
1279 | /** |
1280 | * input_allocate_device - allocate memory for new input device | |
1281 | * | |
1282 | * Returns prepared struct input_dev or NULL. | |
1283 | * | |
1284 | * NOTE: Use input_free_device() to free devices that have not been | |
1285 | * registered; input_unregister_device() should be used for already | |
1286 | * registered devices. | |
1287 | */ | |
d19fbe8a DT |
1288 | struct input_dev *input_allocate_device(void) |
1289 | { | |
1290 | struct input_dev *dev; | |
1291 | ||
1292 | dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); | |
1293 | if (dev) { | |
9657d75c DT |
1294 | dev->dev.type = &input_dev_type; |
1295 | dev->dev.class = &input_class; | |
1296 | device_initialize(&dev->dev); | |
f60d2b11 | 1297 | mutex_init(&dev->mutex); |
8006479c | 1298 | spin_lock_init(&dev->event_lock); |
d19fbe8a DT |
1299 | INIT_LIST_HEAD(&dev->h_list); |
1300 | INIT_LIST_HEAD(&dev->node); | |
655816e4 DT |
1301 | |
1302 | __module_get(THIS_MODULE); | |
d19fbe8a DT |
1303 | } |
1304 | ||
1305 | return dev; | |
1306 | } | |
ca56fe07 | 1307 | EXPORT_SYMBOL(input_allocate_device); |
d19fbe8a | 1308 | |
1447190e DT |
1309 | /** |
1310 | * input_free_device - free memory occupied by input_dev structure | |
1311 | * @dev: input device to free | |
1312 | * | |
1313 | * This function should only be used if input_register_device() | |
1314 | * was not called yet or if it failed. Once device was registered | |
1315 | * use input_unregister_device() and memory will be freed once last | |
8006479c | 1316 | * reference to the device is dropped. |
1447190e DT |
1317 | * |
1318 | * Device should be allocated by input_allocate_device(). | |
1319 | * | |
1320 | * NOTE: If there are references to the input device then memory | |
1321 | * will not be freed until last reference is dropped. | |
1322 | */ | |
f60d2b11 DT |
1323 | void input_free_device(struct input_dev *dev) |
1324 | { | |
54f9e36c | 1325 | if (dev) |
f60d2b11 | 1326 | input_put_device(dev); |
f60d2b11 | 1327 | } |
ca56fe07 | 1328 | EXPORT_SYMBOL(input_free_device); |
f60d2b11 | 1329 | |
534565f2 DT |
1330 | /** |
1331 | * input_set_capability - mark device as capable of a certain event | |
1332 | * @dev: device that is capable of emitting or accepting event | |
1333 | * @type: type of the event (EV_KEY, EV_REL, etc...) | |
1334 | * @code: event code | |
1335 | * | |
1336 | * In addition to setting up corresponding bit in appropriate capability | |
1337 | * bitmap the function also adjusts dev->evbit. | |
1338 | */ | |
1339 | void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code) | |
1340 | { | |
1341 | switch (type) { | |
1342 | case EV_KEY: | |
1343 | __set_bit(code, dev->keybit); | |
1344 | break; | |
1345 | ||
1346 | case EV_REL: | |
1347 | __set_bit(code, dev->relbit); | |
1348 | break; | |
1349 | ||
1350 | case EV_ABS: | |
1351 | __set_bit(code, dev->absbit); | |
1352 | break; | |
1353 | ||
1354 | case EV_MSC: | |
1355 | __set_bit(code, dev->mscbit); | |
1356 | break; | |
1357 | ||
1358 | case EV_SW: | |
1359 | __set_bit(code, dev->swbit); | |
1360 | break; | |
1361 | ||
1362 | case EV_LED: | |
1363 | __set_bit(code, dev->ledbit); | |
1364 | break; | |
1365 | ||
1366 | case EV_SND: | |
1367 | __set_bit(code, dev->sndbit); | |
1368 | break; | |
1369 | ||
1370 | case EV_FF: | |
1371 | __set_bit(code, dev->ffbit); | |
1372 | break; | |
1373 | ||
22d1c398 DB |
1374 | case EV_PWR: |
1375 | /* do nothing */ | |
1376 | break; | |
1377 | ||
534565f2 DT |
1378 | default: |
1379 | printk(KERN_ERR | |
1380 | "input_set_capability: unknown type %u (code %u)\n", | |
1381 | type, code); | |
1382 | dump_stack(); | |
1383 | return; | |
1384 | } | |
1385 | ||
1386 | __set_bit(type, dev->evbit); | |
1387 | } | |
1388 | EXPORT_SYMBOL(input_set_capability); | |
1389 | ||
8006479c DT |
1390 | /** |
1391 | * input_register_device - register device with input core | |
1392 | * @dev: device to be registered | |
1393 | * | |
1394 | * This function registers device with input core. The device must be | |
1395 | * allocated with input_allocate_device() and all it's capabilities | |
1396 | * set up before registering. | |
1397 | * If function fails the device must be freed with input_free_device(). | |
1398 | * Once device has been successfully registered it can be unregistered | |
1399 | * with input_unregister_device(); input_free_device() should not be | |
1400 | * called in this case. | |
1401 | */ | |
5f945489 | 1402 | int input_register_device(struct input_dev *dev) |
1da177e4 | 1403 | { |
bd0ef235 | 1404 | static atomic_t input_no = ATOMIC_INIT(0); |
1da177e4 | 1405 | struct input_handler *handler; |
bd0ef235 DT |
1406 | const char *path; |
1407 | int error; | |
1da177e4 | 1408 | |
8006479c | 1409 | __set_bit(EV_SYN, dev->evbit); |
0fbf87ca | 1410 | |
1da177e4 LT |
1411 | /* |
1412 | * If delay and period are pre-set by the driver, then autorepeating | |
1413 | * is handled by the driver itself and we don't do it in input.c. | |
1414 | */ | |
1415 | ||
1416 | init_timer(&dev->timer); | |
1417 | if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { | |
1418 | dev->timer.data = (long) dev; | |
1419 | dev->timer.function = input_repeat_key; | |
1420 | dev->rep[REP_DELAY] = 250; | |
1421 | dev->rep[REP_PERIOD] = 33; | |
1422 | } | |
1423 | ||
c8e4c772 MR |
1424 | if (!dev->getkeycode) |
1425 | dev->getkeycode = input_default_getkeycode; | |
1426 | ||
1427 | if (!dev->setkeycode) | |
1428 | dev->setkeycode = input_default_setkeycode; | |
1429 | ||
a6c2490f KS |
1430 | dev_set_name(&dev->dev, "input%ld", |
1431 | (unsigned long) atomic_inc_return(&input_no) - 1); | |
bd0ef235 | 1432 | |
9657d75c | 1433 | error = device_add(&dev->dev); |
bd0ef235 DT |
1434 | if (error) |
1435 | return error; | |
1436 | ||
9657d75c | 1437 | path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
bd0ef235 DT |
1438 | printk(KERN_INFO "input: %s as %s\n", |
1439 | dev->name ? dev->name : "Unspecified device", path ? path : "N/A"); | |
1440 | kfree(path); | |
10204020 | 1441 | |
8006479c DT |
1442 | error = mutex_lock_interruptible(&input_mutex); |
1443 | if (error) { | |
1444 | device_del(&dev->dev); | |
1445 | return error; | |
1446 | } | |
1447 | ||
1448 | list_add_tail(&dev->node, &input_dev_list); | |
1449 | ||
1da177e4 | 1450 | list_for_each_entry(handler, &input_handler_list, node) |
5b2a0826 | 1451 | input_attach_handler(dev, handler); |
1da177e4 | 1452 | |
f96b434d | 1453 | input_wakeup_procfs_readers(); |
5f945489 | 1454 | |
8006479c DT |
1455 | mutex_unlock(&input_mutex); |
1456 | ||
5f945489 | 1457 | return 0; |
1da177e4 | 1458 | } |
ca56fe07 | 1459 | EXPORT_SYMBOL(input_register_device); |
1da177e4 | 1460 | |
8006479c DT |
1461 | /** |
1462 | * input_unregister_device - unregister previously registered device | |
1463 | * @dev: device to be unregistered | |
1464 | * | |
1465 | * This function unregisters an input device. Once device is unregistered | |
1466 | * the caller should not try to access it as it may get freed at any moment. | |
1467 | */ | |
1da177e4 LT |
1468 | void input_unregister_device(struct input_dev *dev) |
1469 | { | |
5b2a0826 | 1470 | struct input_handle *handle, *next; |
1da177e4 | 1471 | |
8006479c | 1472 | input_disconnect_device(dev); |
1da177e4 | 1473 | |
8006479c | 1474 | mutex_lock(&input_mutex); |
1da177e4 | 1475 | |
5b2a0826 | 1476 | list_for_each_entry_safe(handle, next, &dev->h_list, d_node) |
1da177e4 | 1477 | handle->handler->disconnect(handle); |
5b2a0826 | 1478 | WARN_ON(!list_empty(&dev->h_list)); |
1da177e4 | 1479 | |
8006479c | 1480 | del_timer_sync(&dev->timer); |
1da177e4 LT |
1481 | list_del_init(&dev->node); |
1482 | ||
f96b434d | 1483 | input_wakeup_procfs_readers(); |
8006479c DT |
1484 | |
1485 | mutex_unlock(&input_mutex); | |
1486 | ||
1487 | device_unregister(&dev->dev); | |
1da177e4 | 1488 | } |
ca56fe07 | 1489 | EXPORT_SYMBOL(input_unregister_device); |
1da177e4 | 1490 | |
8006479c DT |
1491 | /** |
1492 | * input_register_handler - register a new input handler | |
1493 | * @handler: handler to be registered | |
1494 | * | |
1495 | * This function registers a new input handler (interface) for input | |
1496 | * devices in the system and attaches it to all input devices that | |
1497 | * are compatible with the handler. | |
1498 | */ | |
4263cf0f | 1499 | int input_register_handler(struct input_handler *handler) |
1da177e4 LT |
1500 | { |
1501 | struct input_dev *dev; | |
8006479c DT |
1502 | int retval; |
1503 | ||
1504 | retval = mutex_lock_interruptible(&input_mutex); | |
1505 | if (retval) | |
1506 | return retval; | |
1da177e4 | 1507 | |
1da177e4 LT |
1508 | INIT_LIST_HEAD(&handler->h_list); |
1509 | ||
4263cf0f | 1510 | if (handler->fops != NULL) { |
8006479c DT |
1511 | if (input_table[handler->minor >> 5]) { |
1512 | retval = -EBUSY; | |
1513 | goto out; | |
1514 | } | |
1da177e4 | 1515 | input_table[handler->minor >> 5] = handler; |
4263cf0f | 1516 | } |
1da177e4 LT |
1517 | |
1518 | list_add_tail(&handler->node, &input_handler_list); | |
1519 | ||
1520 | list_for_each_entry(dev, &input_dev_list, node) | |
5b2a0826 | 1521 | input_attach_handler(dev, handler); |
1da177e4 | 1522 | |
f96b434d | 1523 | input_wakeup_procfs_readers(); |
8006479c DT |
1524 | |
1525 | out: | |
1526 | mutex_unlock(&input_mutex); | |
1527 | return retval; | |
1da177e4 | 1528 | } |
ca56fe07 | 1529 | EXPORT_SYMBOL(input_register_handler); |
1da177e4 | 1530 | |
8006479c DT |
1531 | /** |
1532 | * input_unregister_handler - unregisters an input handler | |
1533 | * @handler: handler to be unregistered | |
1534 | * | |
1535 | * This function disconnects a handler from its input devices and | |
1536 | * removes it from lists of known handlers. | |
1537 | */ | |
1da177e4 LT |
1538 | void input_unregister_handler(struct input_handler *handler) |
1539 | { | |
5b2a0826 | 1540 | struct input_handle *handle, *next; |
1da177e4 | 1541 | |
8006479c DT |
1542 | mutex_lock(&input_mutex); |
1543 | ||
5b2a0826 | 1544 | list_for_each_entry_safe(handle, next, &handler->h_list, h_node) |
1da177e4 | 1545 | handler->disconnect(handle); |
5b2a0826 | 1546 | WARN_ON(!list_empty(&handler->h_list)); |
1da177e4 LT |
1547 | |
1548 | list_del_init(&handler->node); | |
1549 | ||
1550 | if (handler->fops != NULL) | |
1551 | input_table[handler->minor >> 5] = NULL; | |
1552 | ||
f96b434d | 1553 | input_wakeup_procfs_readers(); |
8006479c DT |
1554 | |
1555 | mutex_unlock(&input_mutex); | |
1da177e4 | 1556 | } |
ca56fe07 | 1557 | EXPORT_SYMBOL(input_unregister_handler); |
1da177e4 | 1558 | |
8006479c DT |
1559 | /** |
1560 | * input_register_handle - register a new input handle | |
1561 | * @handle: handle to register | |
1562 | * | |
1563 | * This function puts a new input handle onto device's | |
1564 | * and handler's lists so that events can flow through | |
1565 | * it once it is opened using input_open_device(). | |
1566 | * | |
1567 | * This function is supposed to be called from handler's | |
1568 | * connect() method. | |
1569 | */ | |
5b2a0826 DT |
1570 | int input_register_handle(struct input_handle *handle) |
1571 | { | |
1572 | struct input_handler *handler = handle->handler; | |
8006479c DT |
1573 | struct input_dev *dev = handle->dev; |
1574 | int error; | |
1575 | ||
1576 | /* | |
1577 | * We take dev->mutex here to prevent race with | |
1578 | * input_release_device(). | |
1579 | */ | |
1580 | error = mutex_lock_interruptible(&dev->mutex); | |
1581 | if (error) | |
1582 | return error; | |
1583 | list_add_tail_rcu(&handle->d_node, &dev->h_list); | |
1584 | mutex_unlock(&dev->mutex); | |
5b2a0826 | 1585 | |
8006479c DT |
1586 | /* |
1587 | * Since we are supposed to be called from ->connect() | |
1588 | * which is mutually exclusive with ->disconnect() | |
1589 | * we can't be racing with input_unregister_handle() | |
1590 | * and so separate lock is not needed here. | |
1591 | */ | |
5b2a0826 DT |
1592 | list_add_tail(&handle->h_node, &handler->h_list); |
1593 | ||
1594 | if (handler->start) | |
1595 | handler->start(handle); | |
1596 | ||
1597 | return 0; | |
1598 | } | |
1599 | EXPORT_SYMBOL(input_register_handle); | |
1600 | ||
8006479c DT |
1601 | /** |
1602 | * input_unregister_handle - unregister an input handle | |
1603 | * @handle: handle to unregister | |
1604 | * | |
1605 | * This function removes input handle from device's | |
1606 | * and handler's lists. | |
1607 | * | |
1608 | * This function is supposed to be called from handler's | |
1609 | * disconnect() method. | |
1610 | */ | |
5b2a0826 DT |
1611 | void input_unregister_handle(struct input_handle *handle) |
1612 | { | |
8006479c DT |
1613 | struct input_dev *dev = handle->dev; |
1614 | ||
5b2a0826 | 1615 | list_del_init(&handle->h_node); |
8006479c DT |
1616 | |
1617 | /* | |
1618 | * Take dev->mutex to prevent race with input_release_device(). | |
1619 | */ | |
1620 | mutex_lock(&dev->mutex); | |
1621 | list_del_rcu(&handle->d_node); | |
1622 | mutex_unlock(&dev->mutex); | |
82ba56c2 | 1623 | synchronize_rcu(); |
5b2a0826 DT |
1624 | } |
1625 | EXPORT_SYMBOL(input_unregister_handle); | |
1626 | ||
1da177e4 LT |
1627 | static int input_open_file(struct inode *inode, struct file *file) |
1628 | { | |
2edbf853 | 1629 | struct input_handler *handler; |
99ac48f5 | 1630 | const struct file_operations *old_fops, *new_fops = NULL; |
1da177e4 LT |
1631 | int err; |
1632 | ||
2edbf853 | 1633 | lock_kernel(); |
1da177e4 | 1634 | /* No load-on-demand here? */ |
2edbf853 JC |
1635 | handler = input_table[iminor(inode) >> 5]; |
1636 | if (!handler || !(new_fops = fops_get(handler->fops))) { | |
1637 | err = -ENODEV; | |
1638 | goto out; | |
1639 | } | |
1da177e4 LT |
1640 | |
1641 | /* | |
1642 | * That's _really_ odd. Usually NULL ->open means "nothing special", | |
1643 | * not "no device". Oh, well... | |
1644 | */ | |
1645 | if (!new_fops->open) { | |
1646 | fops_put(new_fops); | |
2edbf853 JC |
1647 | err = -ENODEV; |
1648 | goto out; | |
1da177e4 LT |
1649 | } |
1650 | old_fops = file->f_op; | |
1651 | file->f_op = new_fops; | |
1652 | ||
1653 | err = new_fops->open(inode, file); | |
1654 | ||
1655 | if (err) { | |
1656 | fops_put(file->f_op); | |
1657 | file->f_op = fops_get(old_fops); | |
1658 | } | |
1659 | fops_put(old_fops); | |
2edbf853 JC |
1660 | out: |
1661 | unlock_kernel(); | |
1da177e4 LT |
1662 | return err; |
1663 | } | |
1664 | ||
2b8693c0 | 1665 | static const struct file_operations input_fops = { |
1da177e4 LT |
1666 | .owner = THIS_MODULE, |
1667 | .open = input_open_file, | |
1668 | }; | |
1669 | ||
61994a61 HR |
1670 | static void __init input_init_abs_bypass(void) |
1671 | { | |
1672 | const unsigned int *p; | |
1673 | ||
1674 | for (p = input_abs_bypass_init_data; *p; p++) | |
1675 | input_abs_bypass[BIT_WORD(*p)] |= BIT_MASK(*p); | |
1676 | } | |
1677 | ||
f96b434d | 1678 | static int __init input_init(void) |
1da177e4 | 1679 | { |
f96b434d | 1680 | int err; |
1da177e4 | 1681 | |
61994a61 HR |
1682 | input_init_abs_bypass(); |
1683 | ||
ea9f240b | 1684 | err = class_register(&input_class); |
d19fbe8a DT |
1685 | if (err) { |
1686 | printk(KERN_ERR "input: unable to register input_dev class\n"); | |
1687 | return err; | |
1688 | } | |
1689 | ||
f96b434d DT |
1690 | err = input_proc_init(); |
1691 | if (err) | |
b0fdfebb | 1692 | goto fail1; |
1da177e4 | 1693 | |
f96b434d DT |
1694 | err = register_chrdev(INPUT_MAJOR, "input", &input_fops); |
1695 | if (err) { | |
1696 | printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR); | |
b0fdfebb | 1697 | goto fail2; |
1da177e4 | 1698 | } |
e334016f | 1699 | |
1da177e4 | 1700 | return 0; |
1da177e4 | 1701 | |
b0fdfebb | 1702 | fail2: input_proc_exit(); |
ea9f240b | 1703 | fail1: class_unregister(&input_class); |
f96b434d | 1704 | return err; |
1da177e4 LT |
1705 | } |
1706 | ||
1707 | static void __exit input_exit(void) | |
1708 | { | |
f96b434d | 1709 | input_proc_exit(); |
1da177e4 | 1710 | unregister_chrdev(INPUT_MAJOR, "input"); |
ea9f240b | 1711 | class_unregister(&input_class); |
1da177e4 LT |
1712 | } |
1713 | ||
1714 | subsys_initcall(input_init); | |
1715 | module_exit(input_exit); |