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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * The input core | |
3 | * | |
4 | * Copyright (c) 1999-2002 Vojtech Pavlik | |
5 | */ | |
6 | ||
7 | /* | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License version 2 as published by | |
10 | * the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/init.h> | |
ffd0db97 | 14 | #include <linux/types.h> |
1da177e4 LT |
15 | #include <linux/input.h> |
16 | #include <linux/module.h> | |
17 | #include <linux/random.h> | |
18 | #include <linux/major.h> | |
19 | #include <linux/proc_fs.h> | |
a99bbaf5 | 20 | #include <linux/sched.h> |
969b21cd | 21 | #include <linux/seq_file.h> |
1da177e4 LT |
22 | #include <linux/poll.h> |
23 | #include <linux/device.h> | |
e676c232 | 24 | #include <linux/mutex.h> |
8006479c | 25 | #include <linux/rcupdate.h> |
2edbf853 | 26 | #include <linux/smp_lock.h> |
15e184af | 27 | #include "input-compat.h" |
1da177e4 LT |
28 | |
29 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>"); | |
30 | MODULE_DESCRIPTION("Input core"); | |
31 | MODULE_LICENSE("GPL"); | |
32 | ||
1da177e4 LT |
33 | #define INPUT_DEVICES 256 |
34 | ||
61994a61 HR |
35 | /* |
36 | * EV_ABS events which should not be cached are listed here. | |
37 | */ | |
38 | static unsigned int input_abs_bypass_init_data[] __initdata = { | |
5e5ee686 HR |
39 | ABS_MT_TOUCH_MAJOR, |
40 | ABS_MT_TOUCH_MINOR, | |
41 | ABS_MT_WIDTH_MAJOR, | |
42 | ABS_MT_WIDTH_MINOR, | |
43 | ABS_MT_ORIENTATION, | |
44 | ABS_MT_POSITION_X, | |
45 | ABS_MT_POSITION_Y, | |
46 | ABS_MT_TOOL_TYPE, | |
47 | ABS_MT_BLOB_ID, | |
df391e0e | 48 | ABS_MT_TRACKING_ID, |
cb6ecf6f | 49 | ABS_MT_PRESSURE, |
61994a61 HR |
50 | 0 |
51 | }; | |
52 | static unsigned long input_abs_bypass[BITS_TO_LONGS(ABS_CNT)]; | |
53 | ||
1da177e4 LT |
54 | static LIST_HEAD(input_dev_list); |
55 | static LIST_HEAD(input_handler_list); | |
56 | ||
8006479c DT |
57 | /* |
58 | * input_mutex protects access to both input_dev_list and input_handler_list. | |
59 | * This also causes input_[un]register_device and input_[un]register_handler | |
60 | * be mutually exclusive which simplifies locking in drivers implementing | |
61 | * input handlers. | |
62 | */ | |
63 | static DEFINE_MUTEX(input_mutex); | |
64 | ||
1da177e4 LT |
65 | static struct input_handler *input_table[8]; |
66 | ||
8006479c DT |
67 | static inline int is_event_supported(unsigned int code, |
68 | unsigned long *bm, unsigned int max) | |
1da177e4 | 69 | { |
8006479c DT |
70 | return code <= max && test_bit(code, bm); |
71 | } | |
1da177e4 | 72 | |
8006479c DT |
73 | static int input_defuzz_abs_event(int value, int old_val, int fuzz) |
74 | { | |
75 | if (fuzz) { | |
76 | if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2) | |
77 | return old_val; | |
1da177e4 | 78 | |
8006479c DT |
79 | if (value > old_val - fuzz && value < old_val + fuzz) |
80 | return (old_val * 3 + value) / 4; | |
1da177e4 | 81 | |
8006479c DT |
82 | if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2) |
83 | return (old_val + value) / 2; | |
84 | } | |
1da177e4 | 85 | |
8006479c DT |
86 | return value; |
87 | } | |
1da177e4 | 88 | |
8006479c | 89 | /* |
ef7995f4 DT |
90 | * Pass event first through all filters and then, if event has not been |
91 | * filtered out, through all open handles. This function is called with | |
82ba56c2 | 92 | * dev->event_lock held and interrupts disabled. |
8006479c DT |
93 | */ |
94 | static void input_pass_event(struct input_dev *dev, | |
95 | unsigned int type, unsigned int code, int value) | |
96 | { | |
ef7995f4 | 97 | struct input_handler *handler; |
82ba56c2 DT |
98 | struct input_handle *handle; |
99 | ||
100 | rcu_read_lock(); | |
1da177e4 | 101 | |
82ba56c2 | 102 | handle = rcu_dereference(dev->grab); |
8006479c DT |
103 | if (handle) |
104 | handle->handler->event(handle, type, code, value); | |
ef7995f4 DT |
105 | else { |
106 | bool filtered = false; | |
107 | ||
108 | list_for_each_entry_rcu(handle, &dev->h_list, d_node) { | |
109 | if (!handle->open) | |
110 | continue; | |
111 | ||
112 | handler = handle->handler; | |
113 | if (!handler->filter) { | |
114 | if (filtered) | |
115 | break; | |
116 | ||
117 | handler->event(handle, type, code, value); | |
118 | ||
119 | } else if (handler->filter(handle, type, code, value)) | |
120 | filtered = true; | |
121 | } | |
122 | } | |
123 | ||
82ba56c2 | 124 | rcu_read_unlock(); |
8006479c | 125 | } |
1da177e4 | 126 | |
8006479c DT |
127 | /* |
128 | * Generate software autorepeat event. Note that we take | |
129 | * dev->event_lock here to avoid racing with input_event | |
130 | * which may cause keys get "stuck". | |
131 | */ | |
132 | static void input_repeat_key(unsigned long data) | |
133 | { | |
134 | struct input_dev *dev = (void *) data; | |
135 | unsigned long flags; | |
1da177e4 | 136 | |
8006479c | 137 | spin_lock_irqsave(&dev->event_lock, flags); |
1da177e4 | 138 | |
8006479c DT |
139 | if (test_bit(dev->repeat_key, dev->key) && |
140 | is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) { | |
1da177e4 | 141 | |
8006479c | 142 | input_pass_event(dev, EV_KEY, dev->repeat_key, 2); |
1da177e4 | 143 | |
8006479c DT |
144 | if (dev->sync) { |
145 | /* | |
146 | * Only send SYN_REPORT if we are not in a middle | |
147 | * of driver parsing a new hardware packet. | |
148 | * Otherwise assume that the driver will send | |
149 | * SYN_REPORT once it's done. | |
150 | */ | |
151 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
152 | } | |
31581066 | 153 | |
8006479c DT |
154 | if (dev->rep[REP_PERIOD]) |
155 | mod_timer(&dev->timer, jiffies + | |
156 | msecs_to_jiffies(dev->rep[REP_PERIOD])); | |
157 | } | |
31581066 | 158 | |
8006479c DT |
159 | spin_unlock_irqrestore(&dev->event_lock, flags); |
160 | } | |
31581066 | 161 | |
8006479c DT |
162 | static void input_start_autorepeat(struct input_dev *dev, int code) |
163 | { | |
164 | if (test_bit(EV_REP, dev->evbit) && | |
165 | dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && | |
166 | dev->timer.data) { | |
167 | dev->repeat_key = code; | |
168 | mod_timer(&dev->timer, | |
169 | jiffies + msecs_to_jiffies(dev->rep[REP_DELAY])); | |
170 | } | |
171 | } | |
31581066 | 172 | |
e7b5c1ef JB |
173 | static void input_stop_autorepeat(struct input_dev *dev) |
174 | { | |
175 | del_timer(&dev->timer); | |
176 | } | |
177 | ||
8006479c DT |
178 | #define INPUT_IGNORE_EVENT 0 |
179 | #define INPUT_PASS_TO_HANDLERS 1 | |
180 | #define INPUT_PASS_TO_DEVICE 2 | |
181 | #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE) | |
1da177e4 | 182 | |
8006479c DT |
183 | static void input_handle_event(struct input_dev *dev, |
184 | unsigned int type, unsigned int code, int value) | |
185 | { | |
186 | int disposition = INPUT_IGNORE_EVENT; | |
1da177e4 | 187 | |
8006479c | 188 | switch (type) { |
1da177e4 | 189 | |
8006479c DT |
190 | case EV_SYN: |
191 | switch (code) { | |
192 | case SYN_CONFIG: | |
193 | disposition = INPUT_PASS_TO_ALL; | |
194 | break; | |
1da177e4 | 195 | |
8006479c DT |
196 | case SYN_REPORT: |
197 | if (!dev->sync) { | |
198 | dev->sync = 1; | |
199 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 200 | } |
1da177e4 | 201 | break; |
5e5ee686 HR |
202 | case SYN_MT_REPORT: |
203 | dev->sync = 0; | |
204 | disposition = INPUT_PASS_TO_HANDLERS; | |
205 | break; | |
8006479c DT |
206 | } |
207 | break; | |
1da177e4 | 208 | |
8006479c DT |
209 | case EV_KEY: |
210 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
211 | !!test_bit(code, dev->key) != value) { | |
1da177e4 | 212 | |
8006479c DT |
213 | if (value != 2) { |
214 | __change_bit(code, dev->key); | |
215 | if (value) | |
216 | input_start_autorepeat(dev, code); | |
e7b5c1ef JB |
217 | else |
218 | input_stop_autorepeat(dev); | |
8006479c | 219 | } |
1da177e4 | 220 | |
8006479c DT |
221 | disposition = INPUT_PASS_TO_HANDLERS; |
222 | } | |
223 | break; | |
1da177e4 | 224 | |
8006479c DT |
225 | case EV_SW: |
226 | if (is_event_supported(code, dev->swbit, SW_MAX) && | |
227 | !!test_bit(code, dev->sw) != value) { | |
1da177e4 | 228 | |
8006479c DT |
229 | __change_bit(code, dev->sw); |
230 | disposition = INPUT_PASS_TO_HANDLERS; | |
231 | } | |
232 | break; | |
1da177e4 | 233 | |
8006479c DT |
234 | case EV_ABS: |
235 | if (is_event_supported(code, dev->absbit, ABS_MAX)) { | |
1da177e4 | 236 | |
61994a61 HR |
237 | if (test_bit(code, input_abs_bypass)) { |
238 | disposition = INPUT_PASS_TO_HANDLERS; | |
239 | break; | |
240 | } | |
241 | ||
8006479c DT |
242 | value = input_defuzz_abs_event(value, |
243 | dev->abs[code], dev->absfuzz[code]); | |
1da177e4 | 244 | |
8006479c DT |
245 | if (dev->abs[code] != value) { |
246 | dev->abs[code] = value; | |
247 | disposition = INPUT_PASS_TO_HANDLERS; | |
248 | } | |
249 | } | |
250 | break; | |
1da177e4 | 251 | |
8006479c DT |
252 | case EV_REL: |
253 | if (is_event_supported(code, dev->relbit, REL_MAX) && value) | |
254 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 255 | |
8006479c | 256 | break; |
1e0afb28 | 257 | |
8006479c DT |
258 | case EV_MSC: |
259 | if (is_event_supported(code, dev->mscbit, MSC_MAX)) | |
260 | disposition = INPUT_PASS_TO_ALL; | |
1da177e4 | 261 | |
8006479c | 262 | break; |
1da177e4 | 263 | |
8006479c DT |
264 | case EV_LED: |
265 | if (is_event_supported(code, dev->ledbit, LED_MAX) && | |
266 | !!test_bit(code, dev->led) != value) { | |
1da177e4 | 267 | |
8006479c DT |
268 | __change_bit(code, dev->led); |
269 | disposition = INPUT_PASS_TO_ALL; | |
270 | } | |
271 | break; | |
272 | ||
273 | case EV_SND: | |
274 | if (is_event_supported(code, dev->sndbit, SND_MAX)) { | |
1da177e4 | 275 | |
8fdc1948 | 276 | if (!!test_bit(code, dev->snd) != !!value) |
8006479c DT |
277 | __change_bit(code, dev->snd); |
278 | disposition = INPUT_PASS_TO_ALL; | |
279 | } | |
280 | break; | |
8fdc1948 | 281 | |
8006479c DT |
282 | case EV_REP: |
283 | if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) { | |
284 | dev->rep[code] = value; | |
285 | disposition = INPUT_PASS_TO_ALL; | |
286 | } | |
287 | break; | |
1da177e4 | 288 | |
8006479c DT |
289 | case EV_FF: |
290 | if (value >= 0) | |
291 | disposition = INPUT_PASS_TO_ALL; | |
292 | break; | |
ed2fa4dd RP |
293 | |
294 | case EV_PWR: | |
295 | disposition = INPUT_PASS_TO_ALL; | |
296 | break; | |
8006479c | 297 | } |
1da177e4 | 298 | |
c9812282 | 299 | if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN) |
8006479c | 300 | dev->sync = 0; |
1da177e4 | 301 | |
8006479c DT |
302 | if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event) |
303 | dev->event(dev, type, code, value); | |
1da177e4 | 304 | |
8006479c DT |
305 | if (disposition & INPUT_PASS_TO_HANDLERS) |
306 | input_pass_event(dev, type, code, value); | |
307 | } | |
1da177e4 | 308 | |
8006479c DT |
309 | /** |
310 | * input_event() - report new input event | |
311 | * @dev: device that generated the event | |
312 | * @type: type of the event | |
313 | * @code: event code | |
314 | * @value: value of the event | |
315 | * | |
316 | * This function should be used by drivers implementing various input | |
df2d4637 DT |
317 | * devices to report input events. See also input_inject_event(). |
318 | * | |
319 | * NOTE: input_event() may be safely used right after input device was | |
320 | * allocated with input_allocate_device(), even before it is registered | |
321 | * with input_register_device(), but the event will not reach any of the | |
322 | * input handlers. Such early invocation of input_event() may be used | |
323 | * to 'seed' initial state of a switch or initial position of absolute | |
324 | * axis, etc. | |
8006479c | 325 | */ |
8006479c DT |
326 | void input_event(struct input_dev *dev, |
327 | unsigned int type, unsigned int code, int value) | |
328 | { | |
329 | unsigned long flags; | |
509ca1a9 | 330 | |
8006479c | 331 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
509ca1a9 | 332 | |
8006479c DT |
333 | spin_lock_irqsave(&dev->event_lock, flags); |
334 | add_input_randomness(type, code, value); | |
335 | input_handle_event(dev, type, code, value); | |
336 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1da177e4 | 337 | } |
1da177e4 | 338 | } |
ca56fe07 | 339 | EXPORT_SYMBOL(input_event); |
1da177e4 | 340 | |
0e739d28 DT |
341 | /** |
342 | * input_inject_event() - send input event from input handler | |
343 | * @handle: input handle to send event through | |
344 | * @type: type of the event | |
345 | * @code: event code | |
346 | * @value: value of the event | |
347 | * | |
8006479c DT |
348 | * Similar to input_event() but will ignore event if device is |
349 | * "grabbed" and handle injecting event is not the one that owns | |
350 | * the device. | |
0e739d28 | 351 | */ |
8006479c DT |
352 | void input_inject_event(struct input_handle *handle, |
353 | unsigned int type, unsigned int code, int value) | |
1da177e4 | 354 | { |
8006479c DT |
355 | struct input_dev *dev = handle->dev; |
356 | struct input_handle *grab; | |
357 | unsigned long flags; | |
1da177e4 | 358 | |
8006479c DT |
359 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
360 | spin_lock_irqsave(&dev->event_lock, flags); | |
1da177e4 | 361 | |
82ba56c2 | 362 | rcu_read_lock(); |
8006479c DT |
363 | grab = rcu_dereference(dev->grab); |
364 | if (!grab || grab == handle) | |
365 | input_handle_event(dev, type, code, value); | |
82ba56c2 | 366 | rcu_read_unlock(); |
1da177e4 | 367 | |
8006479c DT |
368 | spin_unlock_irqrestore(&dev->event_lock, flags); |
369 | } | |
1da177e4 | 370 | } |
8006479c | 371 | EXPORT_SYMBOL(input_inject_event); |
1da177e4 | 372 | |
8006479c DT |
373 | /** |
374 | * input_grab_device - grabs device for exclusive use | |
375 | * @handle: input handle that wants to own the device | |
376 | * | |
377 | * When a device is grabbed by an input handle all events generated by | |
378 | * the device are delivered only to this handle. Also events injected | |
379 | * by other input handles are ignored while device is grabbed. | |
380 | */ | |
1da177e4 LT |
381 | int input_grab_device(struct input_handle *handle) |
382 | { | |
8006479c DT |
383 | struct input_dev *dev = handle->dev; |
384 | int retval; | |
1da177e4 | 385 | |
8006479c DT |
386 | retval = mutex_lock_interruptible(&dev->mutex); |
387 | if (retval) | |
388 | return retval; | |
389 | ||
390 | if (dev->grab) { | |
391 | retval = -EBUSY; | |
392 | goto out; | |
393 | } | |
394 | ||
395 | rcu_assign_pointer(dev->grab, handle); | |
82ba56c2 | 396 | synchronize_rcu(); |
8006479c DT |
397 | |
398 | out: | |
399 | mutex_unlock(&dev->mutex); | |
400 | return retval; | |
1da177e4 | 401 | } |
ca56fe07 | 402 | EXPORT_SYMBOL(input_grab_device); |
1da177e4 | 403 | |
8006479c | 404 | static void __input_release_device(struct input_handle *handle) |
1da177e4 | 405 | { |
a2b2ed2c | 406 | struct input_dev *dev = handle->dev; |
c7e8dc6e | 407 | |
a2b2ed2c | 408 | if (dev->grab == handle) { |
8006479c DT |
409 | rcu_assign_pointer(dev->grab, NULL); |
410 | /* Make sure input_pass_event() notices that grab is gone */ | |
82ba56c2 | 411 | synchronize_rcu(); |
a2b2ed2c AM |
412 | |
413 | list_for_each_entry(handle, &dev->h_list, d_node) | |
8006479c | 414 | if (handle->open && handle->handler->start) |
c7e8dc6e DT |
415 | handle->handler->start(handle); |
416 | } | |
1da177e4 | 417 | } |
8006479c DT |
418 | |
419 | /** | |
420 | * input_release_device - release previously grabbed device | |
421 | * @handle: input handle that owns the device | |
422 | * | |
423 | * Releases previously grabbed device so that other input handles can | |
424 | * start receiving input events. Upon release all handlers attached | |
425 | * to the device have their start() method called so they have a change | |
426 | * to synchronize device state with the rest of the system. | |
427 | */ | |
428 | void input_release_device(struct input_handle *handle) | |
429 | { | |
430 | struct input_dev *dev = handle->dev; | |
431 | ||
432 | mutex_lock(&dev->mutex); | |
433 | __input_release_device(handle); | |
434 | mutex_unlock(&dev->mutex); | |
435 | } | |
ca56fe07 | 436 | EXPORT_SYMBOL(input_release_device); |
1da177e4 | 437 | |
8006479c DT |
438 | /** |
439 | * input_open_device - open input device | |
440 | * @handle: handle through which device is being accessed | |
441 | * | |
442 | * This function should be called by input handlers when they | |
443 | * want to start receive events from given input device. | |
444 | */ | |
1da177e4 LT |
445 | int input_open_device(struct input_handle *handle) |
446 | { | |
0fbf87ca | 447 | struct input_dev *dev = handle->dev; |
8006479c | 448 | int retval; |
0fbf87ca | 449 | |
8006479c DT |
450 | retval = mutex_lock_interruptible(&dev->mutex); |
451 | if (retval) | |
452 | return retval; | |
453 | ||
454 | if (dev->going_away) { | |
455 | retval = -ENODEV; | |
456 | goto out; | |
457 | } | |
0fbf87ca | 458 | |
1da177e4 | 459 | handle->open++; |
0fbf87ca DT |
460 | |
461 | if (!dev->users++ && dev->open) | |
8006479c DT |
462 | retval = dev->open(dev); |
463 | ||
464 | if (retval) { | |
465 | dev->users--; | |
466 | if (!--handle->open) { | |
467 | /* | |
468 | * Make sure we are not delivering any more events | |
469 | * through this handle | |
470 | */ | |
82ba56c2 | 471 | synchronize_rcu(); |
8006479c DT |
472 | } |
473 | } | |
0fbf87ca | 474 | |
8006479c | 475 | out: |
e676c232 | 476 | mutex_unlock(&dev->mutex); |
8006479c | 477 | return retval; |
1da177e4 | 478 | } |
ca56fe07 | 479 | EXPORT_SYMBOL(input_open_device); |
1da177e4 | 480 | |
8006479c | 481 | int input_flush_device(struct input_handle *handle, struct file *file) |
1da177e4 | 482 | { |
8006479c DT |
483 | struct input_dev *dev = handle->dev; |
484 | int retval; | |
1da177e4 | 485 | |
8006479c DT |
486 | retval = mutex_lock_interruptible(&dev->mutex); |
487 | if (retval) | |
488 | return retval; | |
489 | ||
490 | if (dev->flush) | |
491 | retval = dev->flush(dev, file); | |
492 | ||
493 | mutex_unlock(&dev->mutex); | |
494 | return retval; | |
1da177e4 | 495 | } |
ca56fe07 | 496 | EXPORT_SYMBOL(input_flush_device); |
1da177e4 | 497 | |
8006479c DT |
498 | /** |
499 | * input_close_device - close input device | |
500 | * @handle: handle through which device is being accessed | |
501 | * | |
502 | * This function should be called by input handlers when they | |
503 | * want to stop receive events from given input device. | |
504 | */ | |
1da177e4 LT |
505 | void input_close_device(struct input_handle *handle) |
506 | { | |
0fbf87ca DT |
507 | struct input_dev *dev = handle->dev; |
508 | ||
e676c232 | 509 | mutex_lock(&dev->mutex); |
0fbf87ca | 510 | |
8006479c DT |
511 | __input_release_device(handle); |
512 | ||
0fbf87ca DT |
513 | if (!--dev->users && dev->close) |
514 | dev->close(dev); | |
8006479c DT |
515 | |
516 | if (!--handle->open) { | |
517 | /* | |
82ba56c2 | 518 | * synchronize_rcu() makes sure that input_pass_event() |
8006479c DT |
519 | * completed and that no more input events are delivered |
520 | * through this handle | |
521 | */ | |
82ba56c2 | 522 | synchronize_rcu(); |
8006479c | 523 | } |
0fbf87ca | 524 | |
e676c232 | 525 | mutex_unlock(&dev->mutex); |
1da177e4 | 526 | } |
ca56fe07 | 527 | EXPORT_SYMBOL(input_close_device); |
1da177e4 | 528 | |
8006479c DT |
529 | /* |
530 | * Prepare device for unregistering | |
531 | */ | |
532 | static void input_disconnect_device(struct input_dev *dev) | |
533 | { | |
534 | struct input_handle *handle; | |
535 | int code; | |
536 | ||
537 | /* | |
538 | * Mark device as going away. Note that we take dev->mutex here | |
539 | * not to protect access to dev->going_away but rather to ensure | |
540 | * that there are no threads in the middle of input_open_device() | |
541 | */ | |
542 | mutex_lock(&dev->mutex); | |
ffd0db97 | 543 | dev->going_away = true; |
8006479c DT |
544 | mutex_unlock(&dev->mutex); |
545 | ||
546 | spin_lock_irq(&dev->event_lock); | |
547 | ||
548 | /* | |
549 | * Simulate keyup events for all pressed keys so that handlers | |
550 | * are not left with "stuck" keys. The driver may continue | |
551 | * generate events even after we done here but they will not | |
552 | * reach any handlers. | |
553 | */ | |
554 | if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) { | |
555 | for (code = 0; code <= KEY_MAX; code++) { | |
556 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
f4f37c8e | 557 | __test_and_clear_bit(code, dev->key)) { |
8006479c DT |
558 | input_pass_event(dev, EV_KEY, code, 0); |
559 | } | |
560 | } | |
561 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
562 | } | |
563 | ||
564 | list_for_each_entry(handle, &dev->h_list, d_node) | |
565 | handle->open = 0; | |
566 | ||
567 | spin_unlock_irq(&dev->event_lock); | |
568 | } | |
569 | ||
c8e4c772 MR |
570 | static int input_fetch_keycode(struct input_dev *dev, int scancode) |
571 | { | |
572 | switch (dev->keycodesize) { | |
573 | case 1: | |
574 | return ((u8 *)dev->keycode)[scancode]; | |
575 | ||
576 | case 2: | |
577 | return ((u16 *)dev->keycode)[scancode]; | |
578 | ||
579 | default: | |
580 | return ((u32 *)dev->keycode)[scancode]; | |
581 | } | |
582 | } | |
583 | ||
584 | static int input_default_getkeycode(struct input_dev *dev, | |
585 | int scancode, int *keycode) | |
586 | { | |
587 | if (!dev->keycodesize) | |
588 | return -EINVAL; | |
589 | ||
f4f37c8e | 590 | if (scancode >= dev->keycodemax) |
c8e4c772 MR |
591 | return -EINVAL; |
592 | ||
593 | *keycode = input_fetch_keycode(dev, scancode); | |
594 | ||
595 | return 0; | |
596 | } | |
597 | ||
598 | static int input_default_setkeycode(struct input_dev *dev, | |
599 | int scancode, int keycode) | |
600 | { | |
601 | int old_keycode; | |
602 | int i; | |
603 | ||
f4f37c8e | 604 | if (scancode >= dev->keycodemax) |
c8e4c772 MR |
605 | return -EINVAL; |
606 | ||
607 | if (!dev->keycodesize) | |
608 | return -EINVAL; | |
609 | ||
610 | if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8))) | |
611 | return -EINVAL; | |
612 | ||
613 | switch (dev->keycodesize) { | |
614 | case 1: { | |
615 | u8 *k = (u8 *)dev->keycode; | |
616 | old_keycode = k[scancode]; | |
617 | k[scancode] = keycode; | |
618 | break; | |
619 | } | |
620 | case 2: { | |
621 | u16 *k = (u16 *)dev->keycode; | |
622 | old_keycode = k[scancode]; | |
623 | k[scancode] = keycode; | |
624 | break; | |
625 | } | |
626 | default: { | |
627 | u32 *k = (u32 *)dev->keycode; | |
628 | old_keycode = k[scancode]; | |
629 | k[scancode] = keycode; | |
630 | break; | |
631 | } | |
632 | } | |
633 | ||
4f93df40 DT |
634 | __clear_bit(old_keycode, dev->keybit); |
635 | __set_bit(keycode, dev->keybit); | |
c8e4c772 MR |
636 | |
637 | for (i = 0; i < dev->keycodemax; i++) { | |
638 | if (input_fetch_keycode(dev, i) == old_keycode) { | |
4f93df40 | 639 | __set_bit(old_keycode, dev->keybit); |
c8e4c772 MR |
640 | break; /* Setting the bit twice is useless, so break */ |
641 | } | |
642 | } | |
643 | ||
644 | return 0; | |
645 | } | |
646 | ||
f4f37c8e DT |
647 | /** |
648 | * input_get_keycode - retrieve keycode currently mapped to a given scancode | |
649 | * @dev: input device which keymap is being queried | |
650 | * @scancode: scancode (or its equivalent for device in question) for which | |
651 | * keycode is needed | |
652 | * @keycode: result | |
653 | * | |
654 | * This function should be called by anyone interested in retrieving current | |
655 | * keymap. Presently keyboard and evdev handlers use it. | |
656 | */ | |
657 | int input_get_keycode(struct input_dev *dev, int scancode, int *keycode) | |
658 | { | |
659 | if (scancode < 0) | |
660 | return -EINVAL; | |
661 | ||
662 | return dev->getkeycode(dev, scancode, keycode); | |
663 | } | |
664 | EXPORT_SYMBOL(input_get_keycode); | |
665 | ||
666 | /** | |
667 | * input_get_keycode - assign new keycode to a given scancode | |
668 | * @dev: input device which keymap is being updated | |
669 | * @scancode: scancode (or its equivalent for device in question) | |
670 | * @keycode: new keycode to be assigned to the scancode | |
671 | * | |
672 | * This function should be called by anyone needing to update current | |
673 | * keymap. Presently keyboard and evdev handlers use it. | |
674 | */ | |
675 | int input_set_keycode(struct input_dev *dev, int scancode, int keycode) | |
676 | { | |
677 | unsigned long flags; | |
678 | int old_keycode; | |
679 | int retval; | |
680 | ||
681 | if (scancode < 0) | |
682 | return -EINVAL; | |
683 | ||
684 | if (keycode < 0 || keycode > KEY_MAX) | |
685 | return -EINVAL; | |
686 | ||
687 | spin_lock_irqsave(&dev->event_lock, flags); | |
688 | ||
689 | retval = dev->getkeycode(dev, scancode, &old_keycode); | |
690 | if (retval) | |
691 | goto out; | |
692 | ||
693 | retval = dev->setkeycode(dev, scancode, keycode); | |
694 | if (retval) | |
695 | goto out; | |
696 | ||
4f93df40 DT |
697 | /* Make sure KEY_RESERVED did not get enabled. */ |
698 | __clear_bit(KEY_RESERVED, dev->keybit); | |
699 | ||
f4f37c8e DT |
700 | /* |
701 | * Simulate keyup event if keycode is not present | |
702 | * in the keymap anymore | |
703 | */ | |
704 | if (test_bit(EV_KEY, dev->evbit) && | |
705 | !is_event_supported(old_keycode, dev->keybit, KEY_MAX) && | |
706 | __test_and_clear_bit(old_keycode, dev->key)) { | |
707 | ||
708 | input_pass_event(dev, EV_KEY, old_keycode, 0); | |
709 | if (dev->sync) | |
710 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
711 | } | |
712 | ||
713 | out: | |
714 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
715 | ||
716 | return retval; | |
717 | } | |
718 | EXPORT_SYMBOL(input_set_keycode); | |
c8e4c772 | 719 | |
1da177e4 | 720 | #define MATCH_BIT(bit, max) \ |
7b19ada2 | 721 | for (i = 0; i < BITS_TO_LONGS(max); i++) \ |
1da177e4 LT |
722 | if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \ |
723 | break; \ | |
7b19ada2 | 724 | if (i != BITS_TO_LONGS(max)) \ |
1da177e4 LT |
725 | continue; |
726 | ||
0b7024ac | 727 | static const struct input_device_id *input_match_device(struct input_handler *handler, |
66e66118 | 728 | struct input_dev *dev) |
1da177e4 | 729 | { |
0b7024ac | 730 | const struct input_device_id *id; |
1da177e4 LT |
731 | int i; |
732 | ||
0b7024ac | 733 | for (id = handler->id_table; id->flags || id->driver_info; id++) { |
1da177e4 LT |
734 | |
735 | if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) | |
ddc5d341 | 736 | if (id->bustype != dev->id.bustype) |
1da177e4 LT |
737 | continue; |
738 | ||
739 | if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) | |
ddc5d341 | 740 | if (id->vendor != dev->id.vendor) |
1da177e4 LT |
741 | continue; |
742 | ||
743 | if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) | |
ddc5d341 | 744 | if (id->product != dev->id.product) |
1da177e4 LT |
745 | continue; |
746 | ||
747 | if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) | |
ddc5d341 | 748 | if (id->version != dev->id.version) |
1da177e4 LT |
749 | continue; |
750 | ||
751 | MATCH_BIT(evbit, EV_MAX); | |
752 | MATCH_BIT(keybit, KEY_MAX); | |
753 | MATCH_BIT(relbit, REL_MAX); | |
754 | MATCH_BIT(absbit, ABS_MAX); | |
755 | MATCH_BIT(mscbit, MSC_MAX); | |
756 | MATCH_BIT(ledbit, LED_MAX); | |
757 | MATCH_BIT(sndbit, SND_MAX); | |
758 | MATCH_BIT(ffbit, FF_MAX); | |
ff13f98b | 759 | MATCH_BIT(swbit, SW_MAX); |
1da177e4 | 760 | |
0b7024ac DT |
761 | if (!handler->match || handler->match(handler, dev)) |
762 | return id; | |
1da177e4 LT |
763 | } |
764 | ||
765 | return NULL; | |
766 | } | |
767 | ||
5b2a0826 DT |
768 | static int input_attach_handler(struct input_dev *dev, struct input_handler *handler) |
769 | { | |
770 | const struct input_device_id *id; | |
771 | int error; | |
772 | ||
0b7024ac | 773 | id = input_match_device(handler, dev); |
5b2a0826 DT |
774 | if (!id) |
775 | return -ENODEV; | |
776 | ||
777 | error = handler->connect(handler, dev, id); | |
778 | if (error && error != -ENODEV) | |
779 | printk(KERN_ERR | |
780 | "input: failed to attach handler %s to device %s, " | |
781 | "error: %d\n", | |
9657d75c | 782 | handler->name, kobject_name(&dev->dev.kobj), error); |
5b2a0826 DT |
783 | |
784 | return error; | |
785 | } | |
786 | ||
15e184af DT |
787 | #ifdef CONFIG_COMPAT |
788 | ||
789 | static int input_bits_to_string(char *buf, int buf_size, | |
790 | unsigned long bits, bool skip_empty) | |
791 | { | |
792 | int len = 0; | |
793 | ||
794 | if (INPUT_COMPAT_TEST) { | |
795 | u32 dword = bits >> 32; | |
796 | if (dword || !skip_empty) | |
797 | len += snprintf(buf, buf_size, "%x ", dword); | |
798 | ||
799 | dword = bits & 0xffffffffUL; | |
800 | if (dword || !skip_empty || len) | |
801 | len += snprintf(buf + len, max(buf_size - len, 0), | |
802 | "%x", dword); | |
803 | } else { | |
804 | if (bits || !skip_empty) | |
805 | len += snprintf(buf, buf_size, "%lx", bits); | |
806 | } | |
807 | ||
808 | return len; | |
809 | } | |
810 | ||
811 | #else /* !CONFIG_COMPAT */ | |
812 | ||
813 | static int input_bits_to_string(char *buf, int buf_size, | |
814 | unsigned long bits, bool skip_empty) | |
815 | { | |
816 | return bits || !skip_empty ? | |
817 | snprintf(buf, buf_size, "%lx", bits) : 0; | |
818 | } | |
819 | ||
820 | #endif | |
5b2a0826 | 821 | |
f96b434d DT |
822 | #ifdef CONFIG_PROC_FS |
823 | ||
824 | static struct proc_dir_entry *proc_bus_input_dir; | |
825 | static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); | |
826 | static int input_devices_state; | |
827 | ||
828 | static inline void input_wakeup_procfs_readers(void) | |
829 | { | |
830 | input_devices_state++; | |
831 | wake_up(&input_devices_poll_wait); | |
832 | } | |
833 | ||
969b21cd | 834 | static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait) |
f96b434d | 835 | { |
f96b434d | 836 | poll_wait(file, &input_devices_poll_wait, wait); |
fa886612 DT |
837 | if (file->f_version != input_devices_state) { |
838 | file->f_version = input_devices_state; | |
f96b434d | 839 | return POLLIN | POLLRDNORM; |
fa886612 | 840 | } |
1e0afb28 | 841 | |
f96b434d DT |
842 | return 0; |
843 | } | |
844 | ||
1572ca2a DT |
845 | union input_seq_state { |
846 | struct { | |
847 | unsigned short pos; | |
848 | bool mutex_acquired; | |
849 | }; | |
850 | void *p; | |
851 | }; | |
852 | ||
969b21cd DT |
853 | static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) |
854 | { | |
1572ca2a DT |
855 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
856 | int error; | |
857 | ||
858 | /* We need to fit into seq->private pointer */ | |
859 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
860 | ||
861 | error = mutex_lock_interruptible(&input_mutex); | |
862 | if (error) { | |
863 | state->mutex_acquired = false; | |
864 | return ERR_PTR(error); | |
865 | } | |
866 | ||
867 | state->mutex_acquired = true; | |
f96b434d | 868 | |
ad5d972c | 869 | return seq_list_start(&input_dev_list, *pos); |
969b21cd | 870 | } |
051b2fea | 871 | |
969b21cd DT |
872 | static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
873 | { | |
ad5d972c | 874 | return seq_list_next(v, &input_dev_list, pos); |
969b21cd | 875 | } |
f96b434d | 876 | |
1572ca2a | 877 | static void input_seq_stop(struct seq_file *seq, void *v) |
969b21cd | 878 | { |
1572ca2a DT |
879 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
880 | ||
881 | if (state->mutex_acquired) | |
882 | mutex_unlock(&input_mutex); | |
969b21cd | 883 | } |
f96b434d | 884 | |
969b21cd DT |
885 | static void input_seq_print_bitmap(struct seq_file *seq, const char *name, |
886 | unsigned long *bitmap, int max) | |
887 | { | |
888 | int i; | |
15e184af DT |
889 | bool skip_empty = true; |
890 | char buf[18]; | |
f96b434d | 891 | |
969b21cd | 892 | seq_printf(seq, "B: %s=", name); |
15e184af DT |
893 | |
894 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
895 | if (input_bits_to_string(buf, sizeof(buf), | |
896 | bitmap[i], skip_empty)) { | |
897 | skip_empty = false; | |
898 | seq_printf(seq, "%s%s", buf, i > 0 ? " " : ""); | |
899 | } | |
900 | } | |
901 | ||
902 | /* | |
903 | * If no output was produced print a single 0. | |
904 | */ | |
905 | if (skip_empty) | |
906 | seq_puts(seq, "0"); | |
907 | ||
969b21cd DT |
908 | seq_putc(seq, '\n'); |
909 | } | |
f96b434d | 910 | |
969b21cd DT |
911 | static int input_devices_seq_show(struct seq_file *seq, void *v) |
912 | { | |
913 | struct input_dev *dev = container_of(v, struct input_dev, node); | |
9657d75c | 914 | const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
969b21cd DT |
915 | struct input_handle *handle; |
916 | ||
917 | seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", | |
918 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); | |
919 | ||
920 | seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); | |
921 | seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : ""); | |
922 | seq_printf(seq, "S: Sysfs=%s\n", path ? path : ""); | |
15e03ae8 | 923 | seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : ""); |
969b21cd DT |
924 | seq_printf(seq, "H: Handlers="); |
925 | ||
926 | list_for_each_entry(handle, &dev->h_list, d_node) | |
927 | seq_printf(seq, "%s ", handle->name); | |
928 | seq_putc(seq, '\n'); | |
929 | ||
930 | input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); | |
931 | if (test_bit(EV_KEY, dev->evbit)) | |
932 | input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); | |
933 | if (test_bit(EV_REL, dev->evbit)) | |
934 | input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); | |
935 | if (test_bit(EV_ABS, dev->evbit)) | |
936 | input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); | |
937 | if (test_bit(EV_MSC, dev->evbit)) | |
938 | input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); | |
939 | if (test_bit(EV_LED, dev->evbit)) | |
940 | input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); | |
941 | if (test_bit(EV_SND, dev->evbit)) | |
942 | input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); | |
943 | if (test_bit(EV_FF, dev->evbit)) | |
944 | input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); | |
945 | if (test_bit(EV_SW, dev->evbit)) | |
946 | input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); | |
947 | ||
948 | seq_putc(seq, '\n'); | |
949 | ||
950 | kfree(path); | |
951 | return 0; | |
f96b434d DT |
952 | } |
953 | ||
cec69c37 | 954 | static const struct seq_operations input_devices_seq_ops = { |
969b21cd DT |
955 | .start = input_devices_seq_start, |
956 | .next = input_devices_seq_next, | |
1572ca2a | 957 | .stop = input_seq_stop, |
969b21cd DT |
958 | .show = input_devices_seq_show, |
959 | }; | |
960 | ||
961 | static int input_proc_devices_open(struct inode *inode, struct file *file) | |
f96b434d | 962 | { |
969b21cd DT |
963 | return seq_open(file, &input_devices_seq_ops); |
964 | } | |
965 | ||
2b8693c0 | 966 | static const struct file_operations input_devices_fileops = { |
969b21cd DT |
967 | .owner = THIS_MODULE, |
968 | .open = input_proc_devices_open, | |
969 | .poll = input_proc_devices_poll, | |
970 | .read = seq_read, | |
971 | .llseek = seq_lseek, | |
972 | .release = seq_release, | |
973 | }; | |
974 | ||
975 | static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) | |
976 | { | |
1572ca2a DT |
977 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
978 | int error; | |
979 | ||
980 | /* We need to fit into seq->private pointer */ | |
981 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
982 | ||
983 | error = mutex_lock_interruptible(&input_mutex); | |
984 | if (error) { | |
985 | state->mutex_acquired = false; | |
986 | return ERR_PTR(error); | |
987 | } | |
988 | ||
989 | state->mutex_acquired = true; | |
990 | state->pos = *pos; | |
8006479c | 991 | |
ad5d972c | 992 | return seq_list_start(&input_handler_list, *pos); |
969b21cd | 993 | } |
f96b434d | 994 | |
969b21cd DT |
995 | static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
996 | { | |
1572ca2a | 997 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
f96b434d | 998 | |
1572ca2a DT |
999 | state->pos = *pos + 1; |
1000 | return seq_list_next(v, &input_handler_list, pos); | |
969b21cd DT |
1001 | } |
1002 | ||
1003 | static int input_handlers_seq_show(struct seq_file *seq, void *v) | |
1004 | { | |
1005 | struct input_handler *handler = container_of(v, struct input_handler, node); | |
1572ca2a | 1006 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
969b21cd | 1007 | |
1572ca2a | 1008 | seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name); |
ef7995f4 DT |
1009 | if (handler->filter) |
1010 | seq_puts(seq, " (filter)"); | |
969b21cd DT |
1011 | if (handler->fops) |
1012 | seq_printf(seq, " Minor=%d", handler->minor); | |
1013 | seq_putc(seq, '\n'); | |
1014 | ||
1015 | return 0; | |
1016 | } | |
1572ca2a | 1017 | |
cec69c37 | 1018 | static const struct seq_operations input_handlers_seq_ops = { |
969b21cd DT |
1019 | .start = input_handlers_seq_start, |
1020 | .next = input_handlers_seq_next, | |
1572ca2a | 1021 | .stop = input_seq_stop, |
969b21cd DT |
1022 | .show = input_handlers_seq_show, |
1023 | }; | |
1024 | ||
1025 | static int input_proc_handlers_open(struct inode *inode, struct file *file) | |
1026 | { | |
1027 | return seq_open(file, &input_handlers_seq_ops); | |
1028 | } | |
1029 | ||
2b8693c0 | 1030 | static const struct file_operations input_handlers_fileops = { |
969b21cd DT |
1031 | .owner = THIS_MODULE, |
1032 | .open = input_proc_handlers_open, | |
1033 | .read = seq_read, | |
1034 | .llseek = seq_lseek, | |
1035 | .release = seq_release, | |
1036 | }; | |
f96b434d DT |
1037 | |
1038 | static int __init input_proc_init(void) | |
1039 | { | |
1040 | struct proc_dir_entry *entry; | |
1041 | ||
9c37066d | 1042 | proc_bus_input_dir = proc_mkdir("bus/input", NULL); |
f96b434d DT |
1043 | if (!proc_bus_input_dir) |
1044 | return -ENOMEM; | |
1045 | ||
c7705f34 DL |
1046 | entry = proc_create("devices", 0, proc_bus_input_dir, |
1047 | &input_devices_fileops); | |
f96b434d DT |
1048 | if (!entry) |
1049 | goto fail1; | |
1050 | ||
c7705f34 DL |
1051 | entry = proc_create("handlers", 0, proc_bus_input_dir, |
1052 | &input_handlers_fileops); | |
f96b434d DT |
1053 | if (!entry) |
1054 | goto fail2; | |
1055 | ||
f96b434d DT |
1056 | return 0; |
1057 | ||
1058 | fail2: remove_proc_entry("devices", proc_bus_input_dir); | |
9c37066d | 1059 | fail1: remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1060 | return -ENOMEM; |
1061 | } | |
1062 | ||
beffbdc2 | 1063 | static void input_proc_exit(void) |
f96b434d DT |
1064 | { |
1065 | remove_proc_entry("devices", proc_bus_input_dir); | |
1066 | remove_proc_entry("handlers", proc_bus_input_dir); | |
9c37066d | 1067 | remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1068 | } |
1069 | ||
1070 | #else /* !CONFIG_PROC_FS */ | |
1071 | static inline void input_wakeup_procfs_readers(void) { } | |
1072 | static inline int input_proc_init(void) { return 0; } | |
1073 | static inline void input_proc_exit(void) { } | |
1074 | #endif | |
1075 | ||
9657d75c DT |
1076 | #define INPUT_DEV_STRING_ATTR_SHOW(name) \ |
1077 | static ssize_t input_dev_show_##name(struct device *dev, \ | |
1078 | struct device_attribute *attr, \ | |
1079 | char *buf) \ | |
1080 | { \ | |
1081 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1082 | \ | |
1083 | return scnprintf(buf, PAGE_SIZE, "%s\n", \ | |
1084 | input_dev->name ? input_dev->name : ""); \ | |
1085 | } \ | |
1086 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL) | |
5c1e9a6a DT |
1087 | |
1088 | INPUT_DEV_STRING_ATTR_SHOW(name); | |
1089 | INPUT_DEV_STRING_ATTR_SHOW(phys); | |
1090 | INPUT_DEV_STRING_ATTR_SHOW(uniq); | |
1091 | ||
ac648a6a DT |
1092 | static int input_print_modalias_bits(char *buf, int size, |
1093 | char name, unsigned long *bm, | |
1094 | unsigned int min_bit, unsigned int max_bit) | |
1d8f430c | 1095 | { |
ac648a6a | 1096 | int len = 0, i; |
1d8f430c | 1097 | |
ac648a6a DT |
1098 | len += snprintf(buf, max(size, 0), "%c", name); |
1099 | for (i = min_bit; i < max_bit; i++) | |
7b19ada2 | 1100 | if (bm[BIT_WORD(i)] & BIT_MASK(i)) |
ac648a6a | 1101 | len += snprintf(buf + len, max(size - len, 0), "%X,", i); |
1d8f430c RR |
1102 | return len; |
1103 | } | |
1104 | ||
2db66876 DT |
1105 | static int input_print_modalias(char *buf, int size, struct input_dev *id, |
1106 | int add_cr) | |
1d8f430c | 1107 | { |
bd37e5a9 | 1108 | int len; |
1d8f430c | 1109 | |
ac648a6a DT |
1110 | len = snprintf(buf, max(size, 0), |
1111 | "input:b%04Xv%04Xp%04Xe%04X-", | |
1112 | id->id.bustype, id->id.vendor, | |
1113 | id->id.product, id->id.version); | |
1114 | ||
1115 | len += input_print_modalias_bits(buf + len, size - len, | |
1116 | 'e', id->evbit, 0, EV_MAX); | |
1117 | len += input_print_modalias_bits(buf + len, size - len, | |
1118 | 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); | |
1119 | len += input_print_modalias_bits(buf + len, size - len, | |
1120 | 'r', id->relbit, 0, REL_MAX); | |
1121 | len += input_print_modalias_bits(buf + len, size - len, | |
1122 | 'a', id->absbit, 0, ABS_MAX); | |
1123 | len += input_print_modalias_bits(buf + len, size - len, | |
1124 | 'm', id->mscbit, 0, MSC_MAX); | |
1125 | len += input_print_modalias_bits(buf + len, size - len, | |
1126 | 'l', id->ledbit, 0, LED_MAX); | |
1127 | len += input_print_modalias_bits(buf + len, size - len, | |
1128 | 's', id->sndbit, 0, SND_MAX); | |
1129 | len += input_print_modalias_bits(buf + len, size - len, | |
1130 | 'f', id->ffbit, 0, FF_MAX); | |
1131 | len += input_print_modalias_bits(buf + len, size - len, | |
1132 | 'w', id->swbit, 0, SW_MAX); | |
2db66876 DT |
1133 | |
1134 | if (add_cr) | |
ac648a6a | 1135 | len += snprintf(buf + len, max(size - len, 0), "\n"); |
2db66876 | 1136 | |
bd37e5a9 KS |
1137 | return len; |
1138 | } | |
1139 | ||
9657d75c DT |
1140 | static ssize_t input_dev_show_modalias(struct device *dev, |
1141 | struct device_attribute *attr, | |
1142 | char *buf) | |
bd37e5a9 KS |
1143 | { |
1144 | struct input_dev *id = to_input_dev(dev); | |
1145 | ssize_t len; | |
1146 | ||
2db66876 DT |
1147 | len = input_print_modalias(buf, PAGE_SIZE, id, 1); |
1148 | ||
8a3cf456 | 1149 | return min_t(int, len, PAGE_SIZE); |
1d8f430c | 1150 | } |
9657d75c | 1151 | static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); |
1d8f430c | 1152 | |
629b77a4 | 1153 | static struct attribute *input_dev_attrs[] = { |
9657d75c DT |
1154 | &dev_attr_name.attr, |
1155 | &dev_attr_phys.attr, | |
1156 | &dev_attr_uniq.attr, | |
1157 | &dev_attr_modalias.attr, | |
629b77a4 GKH |
1158 | NULL |
1159 | }; | |
1160 | ||
bd0ef235 | 1161 | static struct attribute_group input_dev_attr_group = { |
629b77a4 | 1162 | .attrs = input_dev_attrs, |
5c1e9a6a DT |
1163 | }; |
1164 | ||
9657d75c DT |
1165 | #define INPUT_DEV_ID_ATTR(name) \ |
1166 | static ssize_t input_dev_show_id_##name(struct device *dev, \ | |
1167 | struct device_attribute *attr, \ | |
1168 | char *buf) \ | |
1169 | { \ | |
1170 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1171 | return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \ | |
1172 | } \ | |
1173 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL) | |
5c1e9a6a DT |
1174 | |
1175 | INPUT_DEV_ID_ATTR(bustype); | |
1176 | INPUT_DEV_ID_ATTR(vendor); | |
1177 | INPUT_DEV_ID_ATTR(product); | |
1178 | INPUT_DEV_ID_ATTR(version); | |
1179 | ||
1180 | static struct attribute *input_dev_id_attrs[] = { | |
9657d75c DT |
1181 | &dev_attr_bustype.attr, |
1182 | &dev_attr_vendor.attr, | |
1183 | &dev_attr_product.attr, | |
1184 | &dev_attr_version.attr, | |
5c1e9a6a DT |
1185 | NULL |
1186 | }; | |
1187 | ||
1188 | static struct attribute_group input_dev_id_attr_group = { | |
1189 | .name = "id", | |
1190 | .attrs = input_dev_id_attrs, | |
1191 | }; | |
1192 | ||
969b21cd DT |
1193 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1194 | int max, int add_cr) | |
1195 | { | |
1196 | int i; | |
1197 | int len = 0; | |
15e184af DT |
1198 | bool skip_empty = true; |
1199 | ||
1200 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
1201 | len += input_bits_to_string(buf + len, max(buf_size - len, 0), | |
1202 | bitmap[i], skip_empty); | |
1203 | if (len) { | |
1204 | skip_empty = false; | |
1205 | if (i > 0) | |
1206 | len += snprintf(buf + len, max(buf_size - len, 0), " "); | |
1207 | } | |
1208 | } | |
969b21cd | 1209 | |
15e184af DT |
1210 | /* |
1211 | * If no output was produced print a single 0. | |
1212 | */ | |
1213 | if (len == 0) | |
1214 | len = snprintf(buf, buf_size, "%d", 0); | |
969b21cd DT |
1215 | |
1216 | if (add_cr) | |
1217 | len += snprintf(buf + len, max(buf_size - len, 0), "\n"); | |
1218 | ||
1219 | return len; | |
1220 | } | |
1221 | ||
9657d75c DT |
1222 | #define INPUT_DEV_CAP_ATTR(ev, bm) \ |
1223 | static ssize_t input_dev_show_cap_##bm(struct device *dev, \ | |
1224 | struct device_attribute *attr, \ | |
1225 | char *buf) \ | |
1226 | { \ | |
1227 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1228 | int len = input_print_bitmap(buf, PAGE_SIZE, \ | |
15e184af DT |
1229 | input_dev->bm##bit, ev##_MAX, \ |
1230 | true); \ | |
9657d75c DT |
1231 | return min_t(int, len, PAGE_SIZE); \ |
1232 | } \ | |
1233 | static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL) | |
5c1e9a6a DT |
1234 | |
1235 | INPUT_DEV_CAP_ATTR(EV, ev); | |
1236 | INPUT_DEV_CAP_ATTR(KEY, key); | |
1237 | INPUT_DEV_CAP_ATTR(REL, rel); | |
1238 | INPUT_DEV_CAP_ATTR(ABS, abs); | |
1239 | INPUT_DEV_CAP_ATTR(MSC, msc); | |
1240 | INPUT_DEV_CAP_ATTR(LED, led); | |
1241 | INPUT_DEV_CAP_ATTR(SND, snd); | |
1242 | INPUT_DEV_CAP_ATTR(FF, ff); | |
1243 | INPUT_DEV_CAP_ATTR(SW, sw); | |
1244 | ||
1245 | static struct attribute *input_dev_caps_attrs[] = { | |
9657d75c DT |
1246 | &dev_attr_ev.attr, |
1247 | &dev_attr_key.attr, | |
1248 | &dev_attr_rel.attr, | |
1249 | &dev_attr_abs.attr, | |
1250 | &dev_attr_msc.attr, | |
1251 | &dev_attr_led.attr, | |
1252 | &dev_attr_snd.attr, | |
1253 | &dev_attr_ff.attr, | |
1254 | &dev_attr_sw.attr, | |
5c1e9a6a DT |
1255 | NULL |
1256 | }; | |
1257 | ||
1258 | static struct attribute_group input_dev_caps_attr_group = { | |
1259 | .name = "capabilities", | |
1260 | .attrs = input_dev_caps_attrs, | |
1261 | }; | |
1262 | ||
a4dbd674 | 1263 | static const struct attribute_group *input_dev_attr_groups[] = { |
cb9def4d DT |
1264 | &input_dev_attr_group, |
1265 | &input_dev_id_attr_group, | |
1266 | &input_dev_caps_attr_group, | |
1267 | NULL | |
1268 | }; | |
1269 | ||
9657d75c | 1270 | static void input_dev_release(struct device *device) |
d19fbe8a | 1271 | { |
9657d75c | 1272 | struct input_dev *dev = to_input_dev(device); |
d19fbe8a | 1273 | |
509ca1a9 | 1274 | input_ff_destroy(dev); |
d19fbe8a | 1275 | kfree(dev); |
509ca1a9 | 1276 | |
d19fbe8a DT |
1277 | module_put(THIS_MODULE); |
1278 | } | |
1279 | ||
a7fadbe1 | 1280 | /* |
312c004d | 1281 | * Input uevent interface - loading event handlers based on |
a7fadbe1 DT |
1282 | * device bitfields. |
1283 | */ | |
7eff2e7a | 1284 | static int input_add_uevent_bm_var(struct kobj_uevent_env *env, |
ac648a6a | 1285 | const char *name, unsigned long *bitmap, int max) |
a7fadbe1 | 1286 | { |
7eff2e7a | 1287 | int len; |
a7fadbe1 | 1288 | |
7eff2e7a | 1289 | if (add_uevent_var(env, "%s=", name)) |
a7fadbe1 DT |
1290 | return -ENOMEM; |
1291 | ||
7eff2e7a KS |
1292 | len = input_print_bitmap(&env->buf[env->buflen - 1], |
1293 | sizeof(env->buf) - env->buflen, | |
15e184af | 1294 | bitmap, max, false); |
7eff2e7a | 1295 | if (len >= (sizeof(env->buf) - env->buflen)) |
a7fadbe1 DT |
1296 | return -ENOMEM; |
1297 | ||
7eff2e7a | 1298 | env->buflen += len; |
a7fadbe1 DT |
1299 | return 0; |
1300 | } | |
1301 | ||
7eff2e7a | 1302 | static int input_add_uevent_modalias_var(struct kobj_uevent_env *env, |
ac648a6a DT |
1303 | struct input_dev *dev) |
1304 | { | |
7eff2e7a | 1305 | int len; |
ac648a6a | 1306 | |
7eff2e7a | 1307 | if (add_uevent_var(env, "MODALIAS=")) |
ac648a6a DT |
1308 | return -ENOMEM; |
1309 | ||
7eff2e7a KS |
1310 | len = input_print_modalias(&env->buf[env->buflen - 1], |
1311 | sizeof(env->buf) - env->buflen, | |
1312 | dev, 0); | |
1313 | if (len >= (sizeof(env->buf) - env->buflen)) | |
ac648a6a DT |
1314 | return -ENOMEM; |
1315 | ||
7eff2e7a | 1316 | env->buflen += len; |
ac648a6a DT |
1317 | return 0; |
1318 | } | |
1319 | ||
a7fadbe1 DT |
1320 | #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \ |
1321 | do { \ | |
7eff2e7a | 1322 | int err = add_uevent_var(env, fmt, val); \ |
a7fadbe1 DT |
1323 | if (err) \ |
1324 | return err; \ | |
1325 | } while (0) | |
1326 | ||
1327 | #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \ | |
1328 | do { \ | |
7eff2e7a | 1329 | int err = input_add_uevent_bm_var(env, name, bm, max); \ |
a7fadbe1 DT |
1330 | if (err) \ |
1331 | return err; \ | |
1332 | } while (0) | |
1333 | ||
ac648a6a DT |
1334 | #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \ |
1335 | do { \ | |
7eff2e7a | 1336 | int err = input_add_uevent_modalias_var(env, dev); \ |
ac648a6a DT |
1337 | if (err) \ |
1338 | return err; \ | |
1339 | } while (0) | |
1340 | ||
7eff2e7a | 1341 | static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env) |
a7fadbe1 | 1342 | { |
9657d75c | 1343 | struct input_dev *dev = to_input_dev(device); |
a7fadbe1 DT |
1344 | |
1345 | INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x", | |
1346 | dev->id.bustype, dev->id.vendor, | |
1347 | dev->id.product, dev->id.version); | |
1348 | if (dev->name) | |
1349 | INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); | |
1350 | if (dev->phys) | |
1351 | INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); | |
08de1f04 | 1352 | if (dev->uniq) |
a7fadbe1 DT |
1353 | INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); |
1354 | ||
1355 | INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX); | |
1356 | if (test_bit(EV_KEY, dev->evbit)) | |
1357 | INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX); | |
1358 | if (test_bit(EV_REL, dev->evbit)) | |
1359 | INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX); | |
1360 | if (test_bit(EV_ABS, dev->evbit)) | |
1361 | INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX); | |
1362 | if (test_bit(EV_MSC, dev->evbit)) | |
1363 | INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX); | |
1364 | if (test_bit(EV_LED, dev->evbit)) | |
1365 | INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX); | |
1366 | if (test_bit(EV_SND, dev->evbit)) | |
1367 | INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX); | |
1368 | if (test_bit(EV_FF, dev->evbit)) | |
1369 | INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX); | |
1370 | if (test_bit(EV_SW, dev->evbit)) | |
1371 | INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); | |
1372 | ||
ac648a6a | 1373 | INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); |
a7fadbe1 DT |
1374 | |
1375 | return 0; | |
1376 | } | |
1377 | ||
3cc96351 DT |
1378 | #define INPUT_DO_TOGGLE(dev, type, bits, on) \ |
1379 | do { \ | |
1380 | int i; \ | |
1381 | bool active; \ | |
1382 | \ | |
1383 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1384 | break; \ | |
1385 | \ | |
1386 | for (i = 0; i < type##_MAX; i++) { \ | |
1387 | if (!test_bit(i, dev->bits##bit)) \ | |
1388 | continue; \ | |
1389 | \ | |
1390 | active = test_bit(i, dev->bits); \ | |
1391 | if (!active && !on) \ | |
1392 | continue; \ | |
1393 | \ | |
1394 | dev->event(dev, EV_##type, i, on ? active : 0); \ | |
1395 | } \ | |
ffd0db97 DT |
1396 | } while (0) |
1397 | ||
1c4115e5 | 1398 | #ifdef CONFIG_PM |
ffd0db97 DT |
1399 | static void input_dev_reset(struct input_dev *dev, bool activate) |
1400 | { | |
1401 | if (!dev->event) | |
1402 | return; | |
1403 | ||
1404 | INPUT_DO_TOGGLE(dev, LED, led, activate); | |
1405 | INPUT_DO_TOGGLE(dev, SND, snd, activate); | |
1406 | ||
1407 | if (activate && test_bit(EV_REP, dev->evbit)) { | |
1408 | dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]); | |
1409 | dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]); | |
1410 | } | |
1411 | } | |
1412 | ||
ffd0db97 DT |
1413 | static int input_dev_suspend(struct device *dev) |
1414 | { | |
1415 | struct input_dev *input_dev = to_input_dev(dev); | |
1416 | ||
1417 | mutex_lock(&input_dev->mutex); | |
1418 | input_dev_reset(input_dev, false); | |
1419 | mutex_unlock(&input_dev->mutex); | |
1420 | ||
1421 | return 0; | |
1422 | } | |
1423 | ||
1424 | static int input_dev_resume(struct device *dev) | |
1425 | { | |
1426 | struct input_dev *input_dev = to_input_dev(dev); | |
1427 | ||
1428 | mutex_lock(&input_dev->mutex); | |
1429 | input_dev_reset(input_dev, true); | |
1430 | mutex_unlock(&input_dev->mutex); | |
1431 | ||
1432 | return 0; | |
1433 | } | |
1434 | ||
1435 | static const struct dev_pm_ops input_dev_pm_ops = { | |
1436 | .suspend = input_dev_suspend, | |
1437 | .resume = input_dev_resume, | |
1438 | .poweroff = input_dev_suspend, | |
1439 | .restore = input_dev_resume, | |
1440 | }; | |
1441 | #endif /* CONFIG_PM */ | |
1442 | ||
9657d75c DT |
1443 | static struct device_type input_dev_type = { |
1444 | .groups = input_dev_attr_groups, | |
1445 | .release = input_dev_release, | |
1446 | .uevent = input_dev_uevent, | |
ffd0db97 DT |
1447 | #ifdef CONFIG_PM |
1448 | .pm = &input_dev_pm_ops, | |
1449 | #endif | |
9657d75c DT |
1450 | }; |
1451 | ||
e454cea2 | 1452 | static char *input_devnode(struct device *dev, mode_t *mode) |
aa5ed63e KS |
1453 | { |
1454 | return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev)); | |
1455 | } | |
1456 | ||
ea9f240b | 1457 | struct class input_class = { |
9657d75c | 1458 | .name = "input", |
e454cea2 | 1459 | .devnode = input_devnode, |
d19fbe8a | 1460 | }; |
ca56fe07 | 1461 | EXPORT_SYMBOL_GPL(input_class); |
d19fbe8a | 1462 | |
1447190e DT |
1463 | /** |
1464 | * input_allocate_device - allocate memory for new input device | |
1465 | * | |
1466 | * Returns prepared struct input_dev or NULL. | |
1467 | * | |
1468 | * NOTE: Use input_free_device() to free devices that have not been | |
1469 | * registered; input_unregister_device() should be used for already | |
1470 | * registered devices. | |
1471 | */ | |
d19fbe8a DT |
1472 | struct input_dev *input_allocate_device(void) |
1473 | { | |
1474 | struct input_dev *dev; | |
1475 | ||
1476 | dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); | |
1477 | if (dev) { | |
9657d75c DT |
1478 | dev->dev.type = &input_dev_type; |
1479 | dev->dev.class = &input_class; | |
1480 | device_initialize(&dev->dev); | |
f60d2b11 | 1481 | mutex_init(&dev->mutex); |
8006479c | 1482 | spin_lock_init(&dev->event_lock); |
d19fbe8a DT |
1483 | INIT_LIST_HEAD(&dev->h_list); |
1484 | INIT_LIST_HEAD(&dev->node); | |
655816e4 DT |
1485 | |
1486 | __module_get(THIS_MODULE); | |
d19fbe8a DT |
1487 | } |
1488 | ||
1489 | return dev; | |
1490 | } | |
ca56fe07 | 1491 | EXPORT_SYMBOL(input_allocate_device); |
d19fbe8a | 1492 | |
1447190e DT |
1493 | /** |
1494 | * input_free_device - free memory occupied by input_dev structure | |
1495 | * @dev: input device to free | |
1496 | * | |
1497 | * This function should only be used if input_register_device() | |
1498 | * was not called yet or if it failed. Once device was registered | |
1499 | * use input_unregister_device() and memory will be freed once last | |
8006479c | 1500 | * reference to the device is dropped. |
1447190e DT |
1501 | * |
1502 | * Device should be allocated by input_allocate_device(). | |
1503 | * | |
1504 | * NOTE: If there are references to the input device then memory | |
1505 | * will not be freed until last reference is dropped. | |
1506 | */ | |
f60d2b11 DT |
1507 | void input_free_device(struct input_dev *dev) |
1508 | { | |
54f9e36c | 1509 | if (dev) |
f60d2b11 | 1510 | input_put_device(dev); |
f60d2b11 | 1511 | } |
ca56fe07 | 1512 | EXPORT_SYMBOL(input_free_device); |
f60d2b11 | 1513 | |
534565f2 DT |
1514 | /** |
1515 | * input_set_capability - mark device as capable of a certain event | |
1516 | * @dev: device that is capable of emitting or accepting event | |
1517 | * @type: type of the event (EV_KEY, EV_REL, etc...) | |
1518 | * @code: event code | |
1519 | * | |
1520 | * In addition to setting up corresponding bit in appropriate capability | |
1521 | * bitmap the function also adjusts dev->evbit. | |
1522 | */ | |
1523 | void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code) | |
1524 | { | |
1525 | switch (type) { | |
1526 | case EV_KEY: | |
1527 | __set_bit(code, dev->keybit); | |
1528 | break; | |
1529 | ||
1530 | case EV_REL: | |
1531 | __set_bit(code, dev->relbit); | |
1532 | break; | |
1533 | ||
1534 | case EV_ABS: | |
1535 | __set_bit(code, dev->absbit); | |
1536 | break; | |
1537 | ||
1538 | case EV_MSC: | |
1539 | __set_bit(code, dev->mscbit); | |
1540 | break; | |
1541 | ||
1542 | case EV_SW: | |
1543 | __set_bit(code, dev->swbit); | |
1544 | break; | |
1545 | ||
1546 | case EV_LED: | |
1547 | __set_bit(code, dev->ledbit); | |
1548 | break; | |
1549 | ||
1550 | case EV_SND: | |
1551 | __set_bit(code, dev->sndbit); | |
1552 | break; | |
1553 | ||
1554 | case EV_FF: | |
1555 | __set_bit(code, dev->ffbit); | |
1556 | break; | |
1557 | ||
22d1c398 DES |
1558 | case EV_PWR: |
1559 | /* do nothing */ | |
1560 | break; | |
1561 | ||
534565f2 DT |
1562 | default: |
1563 | printk(KERN_ERR | |
1564 | "input_set_capability: unknown type %u (code %u)\n", | |
1565 | type, code); | |
1566 | dump_stack(); | |
1567 | return; | |
1568 | } | |
1569 | ||
1570 | __set_bit(type, dev->evbit); | |
1571 | } | |
1572 | EXPORT_SYMBOL(input_set_capability); | |
1573 | ||
92a3a587 DT |
1574 | #define INPUT_CLEANSE_BITMASK(dev, type, bits) \ |
1575 | do { \ | |
1576 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1577 | memset(dev->bits##bit, 0, \ | |
1578 | sizeof(dev->bits##bit)); \ | |
1579 | } while (0) | |
1580 | ||
1581 | static void input_cleanse_bitmasks(struct input_dev *dev) | |
1582 | { | |
1583 | INPUT_CLEANSE_BITMASK(dev, KEY, key); | |
1584 | INPUT_CLEANSE_BITMASK(dev, REL, rel); | |
1585 | INPUT_CLEANSE_BITMASK(dev, ABS, abs); | |
1586 | INPUT_CLEANSE_BITMASK(dev, MSC, msc); | |
1587 | INPUT_CLEANSE_BITMASK(dev, LED, led); | |
1588 | INPUT_CLEANSE_BITMASK(dev, SND, snd); | |
1589 | INPUT_CLEANSE_BITMASK(dev, FF, ff); | |
1590 | INPUT_CLEANSE_BITMASK(dev, SW, sw); | |
1591 | } | |
1592 | ||
8006479c DT |
1593 | /** |
1594 | * input_register_device - register device with input core | |
1595 | * @dev: device to be registered | |
1596 | * | |
1597 | * This function registers device with input core. The device must be | |
1598 | * allocated with input_allocate_device() and all it's capabilities | |
1599 | * set up before registering. | |
1600 | * If function fails the device must be freed with input_free_device(). | |
1601 | * Once device has been successfully registered it can be unregistered | |
1602 | * with input_unregister_device(); input_free_device() should not be | |
1603 | * called in this case. | |
1604 | */ | |
5f945489 | 1605 | int input_register_device(struct input_dev *dev) |
1da177e4 | 1606 | { |
bd0ef235 | 1607 | static atomic_t input_no = ATOMIC_INIT(0); |
1da177e4 | 1608 | struct input_handler *handler; |
bd0ef235 DT |
1609 | const char *path; |
1610 | int error; | |
1da177e4 | 1611 | |
4f93df40 | 1612 | /* Every input device generates EV_SYN/SYN_REPORT events. */ |
8006479c | 1613 | __set_bit(EV_SYN, dev->evbit); |
0fbf87ca | 1614 | |
4f93df40 DT |
1615 | /* KEY_RESERVED is not supposed to be transmitted to userspace. */ |
1616 | __clear_bit(KEY_RESERVED, dev->keybit); | |
1617 | ||
92a3a587 DT |
1618 | /* Make sure that bitmasks not mentioned in dev->evbit are clean. */ |
1619 | input_cleanse_bitmasks(dev); | |
1620 | ||
1da177e4 LT |
1621 | /* |
1622 | * If delay and period are pre-set by the driver, then autorepeating | |
1623 | * is handled by the driver itself and we don't do it in input.c. | |
1624 | */ | |
1da177e4 LT |
1625 | init_timer(&dev->timer); |
1626 | if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { | |
1627 | dev->timer.data = (long) dev; | |
1628 | dev->timer.function = input_repeat_key; | |
1629 | dev->rep[REP_DELAY] = 250; | |
1630 | dev->rep[REP_PERIOD] = 33; | |
1631 | } | |
1632 | ||
c8e4c772 MR |
1633 | if (!dev->getkeycode) |
1634 | dev->getkeycode = input_default_getkeycode; | |
1635 | ||
1636 | if (!dev->setkeycode) | |
1637 | dev->setkeycode = input_default_setkeycode; | |
1638 | ||
a6c2490f KS |
1639 | dev_set_name(&dev->dev, "input%ld", |
1640 | (unsigned long) atomic_inc_return(&input_no) - 1); | |
bd0ef235 | 1641 | |
9657d75c | 1642 | error = device_add(&dev->dev); |
bd0ef235 DT |
1643 | if (error) |
1644 | return error; | |
1645 | ||
9657d75c | 1646 | path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
bd0ef235 DT |
1647 | printk(KERN_INFO "input: %s as %s\n", |
1648 | dev->name ? dev->name : "Unspecified device", path ? path : "N/A"); | |
1649 | kfree(path); | |
10204020 | 1650 | |
8006479c DT |
1651 | error = mutex_lock_interruptible(&input_mutex); |
1652 | if (error) { | |
1653 | device_del(&dev->dev); | |
1654 | return error; | |
1655 | } | |
1656 | ||
1657 | list_add_tail(&dev->node, &input_dev_list); | |
1658 | ||
1da177e4 | 1659 | list_for_each_entry(handler, &input_handler_list, node) |
5b2a0826 | 1660 | input_attach_handler(dev, handler); |
1da177e4 | 1661 | |
f96b434d | 1662 | input_wakeup_procfs_readers(); |
5f945489 | 1663 | |
8006479c DT |
1664 | mutex_unlock(&input_mutex); |
1665 | ||
5f945489 | 1666 | return 0; |
1da177e4 | 1667 | } |
ca56fe07 | 1668 | EXPORT_SYMBOL(input_register_device); |
1da177e4 | 1669 | |
8006479c DT |
1670 | /** |
1671 | * input_unregister_device - unregister previously registered device | |
1672 | * @dev: device to be unregistered | |
1673 | * | |
1674 | * This function unregisters an input device. Once device is unregistered | |
1675 | * the caller should not try to access it as it may get freed at any moment. | |
1676 | */ | |
1da177e4 LT |
1677 | void input_unregister_device(struct input_dev *dev) |
1678 | { | |
5b2a0826 | 1679 | struct input_handle *handle, *next; |
1da177e4 | 1680 | |
8006479c | 1681 | input_disconnect_device(dev); |
1da177e4 | 1682 | |
8006479c | 1683 | mutex_lock(&input_mutex); |
1da177e4 | 1684 | |
5b2a0826 | 1685 | list_for_each_entry_safe(handle, next, &dev->h_list, d_node) |
1da177e4 | 1686 | handle->handler->disconnect(handle); |
5b2a0826 | 1687 | WARN_ON(!list_empty(&dev->h_list)); |
1da177e4 | 1688 | |
8006479c | 1689 | del_timer_sync(&dev->timer); |
1da177e4 LT |
1690 | list_del_init(&dev->node); |
1691 | ||
f96b434d | 1692 | input_wakeup_procfs_readers(); |
8006479c DT |
1693 | |
1694 | mutex_unlock(&input_mutex); | |
1695 | ||
1696 | device_unregister(&dev->dev); | |
1da177e4 | 1697 | } |
ca56fe07 | 1698 | EXPORT_SYMBOL(input_unregister_device); |
1da177e4 | 1699 | |
8006479c DT |
1700 | /** |
1701 | * input_register_handler - register a new input handler | |
1702 | * @handler: handler to be registered | |
1703 | * | |
1704 | * This function registers a new input handler (interface) for input | |
1705 | * devices in the system and attaches it to all input devices that | |
1706 | * are compatible with the handler. | |
1707 | */ | |
4263cf0f | 1708 | int input_register_handler(struct input_handler *handler) |
1da177e4 LT |
1709 | { |
1710 | struct input_dev *dev; | |
8006479c DT |
1711 | int retval; |
1712 | ||
1713 | retval = mutex_lock_interruptible(&input_mutex); | |
1714 | if (retval) | |
1715 | return retval; | |
1da177e4 | 1716 | |
1da177e4 LT |
1717 | INIT_LIST_HEAD(&handler->h_list); |
1718 | ||
4263cf0f | 1719 | if (handler->fops != NULL) { |
8006479c DT |
1720 | if (input_table[handler->minor >> 5]) { |
1721 | retval = -EBUSY; | |
1722 | goto out; | |
1723 | } | |
1da177e4 | 1724 | input_table[handler->minor >> 5] = handler; |
4263cf0f | 1725 | } |
1da177e4 LT |
1726 | |
1727 | list_add_tail(&handler->node, &input_handler_list); | |
1728 | ||
1729 | list_for_each_entry(dev, &input_dev_list, node) | |
5b2a0826 | 1730 | input_attach_handler(dev, handler); |
1da177e4 | 1731 | |
f96b434d | 1732 | input_wakeup_procfs_readers(); |
8006479c DT |
1733 | |
1734 | out: | |
1735 | mutex_unlock(&input_mutex); | |
1736 | return retval; | |
1da177e4 | 1737 | } |
ca56fe07 | 1738 | EXPORT_SYMBOL(input_register_handler); |
1da177e4 | 1739 | |
8006479c DT |
1740 | /** |
1741 | * input_unregister_handler - unregisters an input handler | |
1742 | * @handler: handler to be unregistered | |
1743 | * | |
1744 | * This function disconnects a handler from its input devices and | |
1745 | * removes it from lists of known handlers. | |
1746 | */ | |
1da177e4 LT |
1747 | void input_unregister_handler(struct input_handler *handler) |
1748 | { | |
5b2a0826 | 1749 | struct input_handle *handle, *next; |
1da177e4 | 1750 | |
8006479c DT |
1751 | mutex_lock(&input_mutex); |
1752 | ||
5b2a0826 | 1753 | list_for_each_entry_safe(handle, next, &handler->h_list, h_node) |
1da177e4 | 1754 | handler->disconnect(handle); |
5b2a0826 | 1755 | WARN_ON(!list_empty(&handler->h_list)); |
1da177e4 LT |
1756 | |
1757 | list_del_init(&handler->node); | |
1758 | ||
1759 | if (handler->fops != NULL) | |
1760 | input_table[handler->minor >> 5] = NULL; | |
1761 | ||
f96b434d | 1762 | input_wakeup_procfs_readers(); |
8006479c DT |
1763 | |
1764 | mutex_unlock(&input_mutex); | |
1da177e4 | 1765 | } |
ca56fe07 | 1766 | EXPORT_SYMBOL(input_unregister_handler); |
1da177e4 | 1767 | |
66d2a595 DT |
1768 | /** |
1769 | * input_handler_for_each_handle - handle iterator | |
1770 | * @handler: input handler to iterate | |
1771 | * @data: data for the callback | |
1772 | * @fn: function to be called for each handle | |
1773 | * | |
1774 | * Iterate over @bus's list of devices, and call @fn for each, passing | |
1775 | * it @data and stop when @fn returns a non-zero value. The function is | |
1776 | * using RCU to traverse the list and therefore may be usind in atonic | |
1777 | * contexts. The @fn callback is invoked from RCU critical section and | |
1778 | * thus must not sleep. | |
1779 | */ | |
1780 | int input_handler_for_each_handle(struct input_handler *handler, void *data, | |
1781 | int (*fn)(struct input_handle *, void *)) | |
1782 | { | |
1783 | struct input_handle *handle; | |
1784 | int retval = 0; | |
1785 | ||
1786 | rcu_read_lock(); | |
1787 | ||
1788 | list_for_each_entry_rcu(handle, &handler->h_list, h_node) { | |
1789 | retval = fn(handle, data); | |
1790 | if (retval) | |
1791 | break; | |
1792 | } | |
1793 | ||
1794 | rcu_read_unlock(); | |
1795 | ||
1796 | return retval; | |
1797 | } | |
1798 | EXPORT_SYMBOL(input_handler_for_each_handle); | |
1799 | ||
8006479c DT |
1800 | /** |
1801 | * input_register_handle - register a new input handle | |
1802 | * @handle: handle to register | |
1803 | * | |
1804 | * This function puts a new input handle onto device's | |
1805 | * and handler's lists so that events can flow through | |
1806 | * it once it is opened using input_open_device(). | |
1807 | * | |
1808 | * This function is supposed to be called from handler's | |
1809 | * connect() method. | |
1810 | */ | |
5b2a0826 DT |
1811 | int input_register_handle(struct input_handle *handle) |
1812 | { | |
1813 | struct input_handler *handler = handle->handler; | |
8006479c DT |
1814 | struct input_dev *dev = handle->dev; |
1815 | int error; | |
1816 | ||
1817 | /* | |
1818 | * We take dev->mutex here to prevent race with | |
1819 | * input_release_device(). | |
1820 | */ | |
1821 | error = mutex_lock_interruptible(&dev->mutex); | |
1822 | if (error) | |
1823 | return error; | |
ef7995f4 DT |
1824 | |
1825 | /* | |
1826 | * Filters go to the head of the list, normal handlers | |
1827 | * to the tail. | |
1828 | */ | |
1829 | if (handler->filter) | |
1830 | list_add_rcu(&handle->d_node, &dev->h_list); | |
1831 | else | |
1832 | list_add_tail_rcu(&handle->d_node, &dev->h_list); | |
1833 | ||
8006479c | 1834 | mutex_unlock(&dev->mutex); |
5b2a0826 | 1835 | |
8006479c DT |
1836 | /* |
1837 | * Since we are supposed to be called from ->connect() | |
1838 | * which is mutually exclusive with ->disconnect() | |
1839 | * we can't be racing with input_unregister_handle() | |
1840 | * and so separate lock is not needed here. | |
1841 | */ | |
66d2a595 | 1842 | list_add_tail_rcu(&handle->h_node, &handler->h_list); |
5b2a0826 DT |
1843 | |
1844 | if (handler->start) | |
1845 | handler->start(handle); | |
1846 | ||
1847 | return 0; | |
1848 | } | |
1849 | EXPORT_SYMBOL(input_register_handle); | |
1850 | ||
8006479c DT |
1851 | /** |
1852 | * input_unregister_handle - unregister an input handle | |
1853 | * @handle: handle to unregister | |
1854 | * | |
1855 | * This function removes input handle from device's | |
1856 | * and handler's lists. | |
1857 | * | |
1858 | * This function is supposed to be called from handler's | |
1859 | * disconnect() method. | |
1860 | */ | |
5b2a0826 DT |
1861 | void input_unregister_handle(struct input_handle *handle) |
1862 | { | |
8006479c DT |
1863 | struct input_dev *dev = handle->dev; |
1864 | ||
66d2a595 | 1865 | list_del_rcu(&handle->h_node); |
8006479c DT |
1866 | |
1867 | /* | |
1868 | * Take dev->mutex to prevent race with input_release_device(). | |
1869 | */ | |
1870 | mutex_lock(&dev->mutex); | |
1871 | list_del_rcu(&handle->d_node); | |
1872 | mutex_unlock(&dev->mutex); | |
66d2a595 | 1873 | |
82ba56c2 | 1874 | synchronize_rcu(); |
5b2a0826 DT |
1875 | } |
1876 | EXPORT_SYMBOL(input_unregister_handle); | |
1877 | ||
1da177e4 LT |
1878 | static int input_open_file(struct inode *inode, struct file *file) |
1879 | { | |
2edbf853 | 1880 | struct input_handler *handler; |
99ac48f5 | 1881 | const struct file_operations *old_fops, *new_fops = NULL; |
1da177e4 LT |
1882 | int err; |
1883 | ||
2edbf853 | 1884 | lock_kernel(); |
1da177e4 | 1885 | /* No load-on-demand here? */ |
2edbf853 JC |
1886 | handler = input_table[iminor(inode) >> 5]; |
1887 | if (!handler || !(new_fops = fops_get(handler->fops))) { | |
1888 | err = -ENODEV; | |
1889 | goto out; | |
1890 | } | |
1da177e4 LT |
1891 | |
1892 | /* | |
1893 | * That's _really_ odd. Usually NULL ->open means "nothing special", | |
1894 | * not "no device". Oh, well... | |
1895 | */ | |
1896 | if (!new_fops->open) { | |
1897 | fops_put(new_fops); | |
2edbf853 JC |
1898 | err = -ENODEV; |
1899 | goto out; | |
1da177e4 LT |
1900 | } |
1901 | old_fops = file->f_op; | |
1902 | file->f_op = new_fops; | |
1903 | ||
1904 | err = new_fops->open(inode, file); | |
1905 | ||
1906 | if (err) { | |
1907 | fops_put(file->f_op); | |
1908 | file->f_op = fops_get(old_fops); | |
1909 | } | |
1910 | fops_put(old_fops); | |
2edbf853 JC |
1911 | out: |
1912 | unlock_kernel(); | |
1da177e4 LT |
1913 | return err; |
1914 | } | |
1915 | ||
2b8693c0 | 1916 | static const struct file_operations input_fops = { |
1da177e4 LT |
1917 | .owner = THIS_MODULE, |
1918 | .open = input_open_file, | |
1919 | }; | |
1920 | ||
61994a61 HR |
1921 | static void __init input_init_abs_bypass(void) |
1922 | { | |
1923 | const unsigned int *p; | |
1924 | ||
1925 | for (p = input_abs_bypass_init_data; *p; p++) | |
1926 | input_abs_bypass[BIT_WORD(*p)] |= BIT_MASK(*p); | |
1927 | } | |
1928 | ||
f96b434d | 1929 | static int __init input_init(void) |
1da177e4 | 1930 | { |
f96b434d | 1931 | int err; |
1da177e4 | 1932 | |
61994a61 HR |
1933 | input_init_abs_bypass(); |
1934 | ||
ea9f240b | 1935 | err = class_register(&input_class); |
d19fbe8a DT |
1936 | if (err) { |
1937 | printk(KERN_ERR "input: unable to register input_dev class\n"); | |
1938 | return err; | |
1939 | } | |
1940 | ||
f96b434d DT |
1941 | err = input_proc_init(); |
1942 | if (err) | |
b0fdfebb | 1943 | goto fail1; |
1da177e4 | 1944 | |
f96b434d DT |
1945 | err = register_chrdev(INPUT_MAJOR, "input", &input_fops); |
1946 | if (err) { | |
1947 | printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR); | |
b0fdfebb | 1948 | goto fail2; |
1da177e4 | 1949 | } |
e334016f | 1950 | |
1da177e4 | 1951 | return 0; |
1da177e4 | 1952 | |
b0fdfebb | 1953 | fail2: input_proc_exit(); |
ea9f240b | 1954 | fail1: class_unregister(&input_class); |
f96b434d | 1955 | return err; |
1da177e4 LT |
1956 | } |
1957 | ||
1958 | static void __exit input_exit(void) | |
1959 | { | |
f96b434d | 1960 | input_proc_exit(); |
1da177e4 | 1961 | unregister_chrdev(INPUT_MAJOR, "input"); |
ea9f240b | 1962 | class_unregister(&input_class); |
1da177e4 LT |
1963 | } |
1964 | ||
1965 | subsys_initcall(input_init); | |
1966 | module_exit(input_exit); |