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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> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
1da177e4 LT |
18 | #include <linux/random.h> |
19 | #include <linux/major.h> | |
20 | #include <linux/proc_fs.h> | |
a99bbaf5 | 21 | #include <linux/sched.h> |
969b21cd | 22 | #include <linux/seq_file.h> |
1da177e4 LT |
23 | #include <linux/poll.h> |
24 | #include <linux/device.h> | |
e676c232 | 25 | #include <linux/mutex.h> |
8006479c | 26 | #include <linux/rcupdate.h> |
2edbf853 | 27 | #include <linux/smp_lock.h> |
15e184af | 28 | #include "input-compat.h" |
1da177e4 LT |
29 | |
30 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>"); | |
31 | MODULE_DESCRIPTION("Input core"); | |
32 | MODULE_LICENSE("GPL"); | |
33 | ||
1da177e4 LT |
34 | #define INPUT_DEVICES 256 |
35 | ||
36 | static LIST_HEAD(input_dev_list); | |
37 | static LIST_HEAD(input_handler_list); | |
38 | ||
8006479c DT |
39 | /* |
40 | * input_mutex protects access to both input_dev_list and input_handler_list. | |
41 | * This also causes input_[un]register_device and input_[un]register_handler | |
42 | * be mutually exclusive which simplifies locking in drivers implementing | |
43 | * input handlers. | |
44 | */ | |
45 | static DEFINE_MUTEX(input_mutex); | |
46 | ||
1da177e4 LT |
47 | static struct input_handler *input_table[8]; |
48 | ||
8006479c DT |
49 | static inline int is_event_supported(unsigned int code, |
50 | unsigned long *bm, unsigned int max) | |
1da177e4 | 51 | { |
8006479c DT |
52 | return code <= max && test_bit(code, bm); |
53 | } | |
1da177e4 | 54 | |
8006479c DT |
55 | static int input_defuzz_abs_event(int value, int old_val, int fuzz) |
56 | { | |
57 | if (fuzz) { | |
58 | if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2) | |
59 | return old_val; | |
1da177e4 | 60 | |
8006479c DT |
61 | if (value > old_val - fuzz && value < old_val + fuzz) |
62 | return (old_val * 3 + value) / 4; | |
1da177e4 | 63 | |
8006479c DT |
64 | if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2) |
65 | return (old_val + value) / 2; | |
66 | } | |
1da177e4 | 67 | |
8006479c DT |
68 | return value; |
69 | } | |
1da177e4 | 70 | |
8006479c | 71 | /* |
ef7995f4 DT |
72 | * Pass event first through all filters and then, if event has not been |
73 | * filtered out, through all open handles. This function is called with | |
82ba56c2 | 74 | * dev->event_lock held and interrupts disabled. |
8006479c DT |
75 | */ |
76 | static void input_pass_event(struct input_dev *dev, | |
77 | unsigned int type, unsigned int code, int value) | |
78 | { | |
ef7995f4 | 79 | struct input_handler *handler; |
82ba56c2 DT |
80 | struct input_handle *handle; |
81 | ||
82 | rcu_read_lock(); | |
1da177e4 | 83 | |
82ba56c2 | 84 | handle = rcu_dereference(dev->grab); |
8006479c DT |
85 | if (handle) |
86 | handle->handler->event(handle, type, code, value); | |
ef7995f4 DT |
87 | else { |
88 | bool filtered = false; | |
89 | ||
90 | list_for_each_entry_rcu(handle, &dev->h_list, d_node) { | |
91 | if (!handle->open) | |
92 | continue; | |
93 | ||
94 | handler = handle->handler; | |
95 | if (!handler->filter) { | |
96 | if (filtered) | |
97 | break; | |
98 | ||
99 | handler->event(handle, type, code, value); | |
100 | ||
101 | } else if (handler->filter(handle, type, code, value)) | |
102 | filtered = true; | |
103 | } | |
104 | } | |
105 | ||
82ba56c2 | 106 | rcu_read_unlock(); |
8006479c | 107 | } |
1da177e4 | 108 | |
8006479c DT |
109 | /* |
110 | * Generate software autorepeat event. Note that we take | |
111 | * dev->event_lock here to avoid racing with input_event | |
112 | * which may cause keys get "stuck". | |
113 | */ | |
114 | static void input_repeat_key(unsigned long data) | |
115 | { | |
116 | struct input_dev *dev = (void *) data; | |
117 | unsigned long flags; | |
1da177e4 | 118 | |
8006479c | 119 | spin_lock_irqsave(&dev->event_lock, flags); |
1da177e4 | 120 | |
8006479c DT |
121 | if (test_bit(dev->repeat_key, dev->key) && |
122 | is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) { | |
1da177e4 | 123 | |
8006479c | 124 | input_pass_event(dev, EV_KEY, dev->repeat_key, 2); |
1da177e4 | 125 | |
8006479c DT |
126 | if (dev->sync) { |
127 | /* | |
128 | * Only send SYN_REPORT if we are not in a middle | |
129 | * of driver parsing a new hardware packet. | |
130 | * Otherwise assume that the driver will send | |
131 | * SYN_REPORT once it's done. | |
132 | */ | |
133 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
134 | } | |
31581066 | 135 | |
8006479c DT |
136 | if (dev->rep[REP_PERIOD]) |
137 | mod_timer(&dev->timer, jiffies + | |
138 | msecs_to_jiffies(dev->rep[REP_PERIOD])); | |
139 | } | |
31581066 | 140 | |
8006479c DT |
141 | spin_unlock_irqrestore(&dev->event_lock, flags); |
142 | } | |
31581066 | 143 | |
8006479c DT |
144 | static void input_start_autorepeat(struct input_dev *dev, int code) |
145 | { | |
146 | if (test_bit(EV_REP, dev->evbit) && | |
147 | dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && | |
148 | dev->timer.data) { | |
149 | dev->repeat_key = code; | |
150 | mod_timer(&dev->timer, | |
151 | jiffies + msecs_to_jiffies(dev->rep[REP_DELAY])); | |
152 | } | |
153 | } | |
31581066 | 154 | |
e7b5c1ef JB |
155 | static void input_stop_autorepeat(struct input_dev *dev) |
156 | { | |
157 | del_timer(&dev->timer); | |
158 | } | |
159 | ||
8006479c DT |
160 | #define INPUT_IGNORE_EVENT 0 |
161 | #define INPUT_PASS_TO_HANDLERS 1 | |
162 | #define INPUT_PASS_TO_DEVICE 2 | |
163 | #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE) | |
1da177e4 | 164 | |
40d007e7 HR |
165 | static int input_handle_abs_event(struct input_dev *dev, |
166 | unsigned int code, int *pval) | |
167 | { | |
168 | bool is_mt_event; | |
169 | int *pold; | |
170 | ||
171 | if (code == ABS_MT_SLOT) { | |
172 | /* | |
173 | * "Stage" the event; we'll flush it later, when we | |
174 | * get actiual touch data. | |
175 | */ | |
176 | if (*pval >= 0 && *pval < dev->mtsize) | |
177 | dev->slot = *pval; | |
178 | ||
179 | return INPUT_IGNORE_EVENT; | |
180 | } | |
181 | ||
182 | is_mt_event = code >= ABS_MT_FIRST && code <= ABS_MT_LAST; | |
183 | ||
184 | if (!is_mt_event) { | |
185 | pold = &dev->abs[code]; | |
186 | } else if (dev->mt) { | |
187 | struct input_mt_slot *mtslot = &dev->mt[dev->slot]; | |
188 | pold = &mtslot->abs[code - ABS_MT_FIRST]; | |
189 | } else { | |
190 | /* | |
191 | * Bypass filtering for multitouch events when | |
192 | * not employing slots. | |
193 | */ | |
194 | pold = NULL; | |
195 | } | |
196 | ||
197 | if (pold) { | |
198 | *pval = input_defuzz_abs_event(*pval, *pold, | |
199 | dev->absfuzz[code]); | |
200 | if (*pold == *pval) | |
201 | return INPUT_IGNORE_EVENT; | |
202 | ||
203 | *pold = *pval; | |
204 | } | |
205 | ||
206 | /* Flush pending "slot" event */ | |
207 | if (is_mt_event && dev->slot != dev->abs[ABS_MT_SLOT]) { | |
208 | dev->abs[ABS_MT_SLOT] = dev->slot; | |
209 | input_pass_event(dev, EV_ABS, ABS_MT_SLOT, dev->slot); | |
210 | } | |
211 | ||
212 | return INPUT_PASS_TO_HANDLERS; | |
213 | } | |
214 | ||
8006479c DT |
215 | static void input_handle_event(struct input_dev *dev, |
216 | unsigned int type, unsigned int code, int value) | |
217 | { | |
218 | int disposition = INPUT_IGNORE_EVENT; | |
1da177e4 | 219 | |
8006479c | 220 | switch (type) { |
1da177e4 | 221 | |
8006479c DT |
222 | case EV_SYN: |
223 | switch (code) { | |
224 | case SYN_CONFIG: | |
225 | disposition = INPUT_PASS_TO_ALL; | |
226 | break; | |
1da177e4 | 227 | |
8006479c DT |
228 | case SYN_REPORT: |
229 | if (!dev->sync) { | |
230 | dev->sync = 1; | |
231 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 232 | } |
1da177e4 | 233 | break; |
5e5ee686 HR |
234 | case SYN_MT_REPORT: |
235 | dev->sync = 0; | |
236 | disposition = INPUT_PASS_TO_HANDLERS; | |
237 | break; | |
8006479c DT |
238 | } |
239 | break; | |
1da177e4 | 240 | |
8006479c DT |
241 | case EV_KEY: |
242 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
243 | !!test_bit(code, dev->key) != value) { | |
1da177e4 | 244 | |
8006479c DT |
245 | if (value != 2) { |
246 | __change_bit(code, dev->key); | |
247 | if (value) | |
248 | input_start_autorepeat(dev, code); | |
e7b5c1ef JB |
249 | else |
250 | input_stop_autorepeat(dev); | |
8006479c | 251 | } |
1da177e4 | 252 | |
8006479c DT |
253 | disposition = INPUT_PASS_TO_HANDLERS; |
254 | } | |
255 | break; | |
1da177e4 | 256 | |
8006479c DT |
257 | case EV_SW: |
258 | if (is_event_supported(code, dev->swbit, SW_MAX) && | |
259 | !!test_bit(code, dev->sw) != value) { | |
1da177e4 | 260 | |
8006479c DT |
261 | __change_bit(code, dev->sw); |
262 | disposition = INPUT_PASS_TO_HANDLERS; | |
263 | } | |
264 | break; | |
1da177e4 | 265 | |
8006479c | 266 | case EV_ABS: |
40d007e7 HR |
267 | if (is_event_supported(code, dev->absbit, ABS_MAX)) |
268 | disposition = input_handle_abs_event(dev, code, &value); | |
61994a61 | 269 | |
8006479c | 270 | break; |
1da177e4 | 271 | |
8006479c DT |
272 | case EV_REL: |
273 | if (is_event_supported(code, dev->relbit, REL_MAX) && value) | |
274 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 275 | |
8006479c | 276 | break; |
1e0afb28 | 277 | |
8006479c DT |
278 | case EV_MSC: |
279 | if (is_event_supported(code, dev->mscbit, MSC_MAX)) | |
280 | disposition = INPUT_PASS_TO_ALL; | |
1da177e4 | 281 | |
8006479c | 282 | break; |
1da177e4 | 283 | |
8006479c DT |
284 | case EV_LED: |
285 | if (is_event_supported(code, dev->ledbit, LED_MAX) && | |
286 | !!test_bit(code, dev->led) != value) { | |
1da177e4 | 287 | |
8006479c DT |
288 | __change_bit(code, dev->led); |
289 | disposition = INPUT_PASS_TO_ALL; | |
290 | } | |
291 | break; | |
292 | ||
293 | case EV_SND: | |
294 | if (is_event_supported(code, dev->sndbit, SND_MAX)) { | |
1da177e4 | 295 | |
8fdc1948 | 296 | if (!!test_bit(code, dev->snd) != !!value) |
8006479c DT |
297 | __change_bit(code, dev->snd); |
298 | disposition = INPUT_PASS_TO_ALL; | |
299 | } | |
300 | break; | |
8fdc1948 | 301 | |
8006479c DT |
302 | case EV_REP: |
303 | if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) { | |
304 | dev->rep[code] = value; | |
305 | disposition = INPUT_PASS_TO_ALL; | |
306 | } | |
307 | break; | |
1da177e4 | 308 | |
8006479c DT |
309 | case EV_FF: |
310 | if (value >= 0) | |
311 | disposition = INPUT_PASS_TO_ALL; | |
312 | break; | |
ed2fa4dd RP |
313 | |
314 | case EV_PWR: | |
315 | disposition = INPUT_PASS_TO_ALL; | |
316 | break; | |
8006479c | 317 | } |
1da177e4 | 318 | |
c9812282 | 319 | if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN) |
8006479c | 320 | dev->sync = 0; |
1da177e4 | 321 | |
8006479c DT |
322 | if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event) |
323 | dev->event(dev, type, code, value); | |
1da177e4 | 324 | |
8006479c DT |
325 | if (disposition & INPUT_PASS_TO_HANDLERS) |
326 | input_pass_event(dev, type, code, value); | |
327 | } | |
1da177e4 | 328 | |
8006479c DT |
329 | /** |
330 | * input_event() - report new input event | |
331 | * @dev: device that generated the event | |
332 | * @type: type of the event | |
333 | * @code: event code | |
334 | * @value: value of the event | |
335 | * | |
336 | * This function should be used by drivers implementing various input | |
df2d4637 DT |
337 | * devices to report input events. See also input_inject_event(). |
338 | * | |
339 | * NOTE: input_event() may be safely used right after input device was | |
340 | * allocated with input_allocate_device(), even before it is registered | |
341 | * with input_register_device(), but the event will not reach any of the | |
342 | * input handlers. Such early invocation of input_event() may be used | |
343 | * to 'seed' initial state of a switch or initial position of absolute | |
344 | * axis, etc. | |
8006479c | 345 | */ |
8006479c DT |
346 | void input_event(struct input_dev *dev, |
347 | unsigned int type, unsigned int code, int value) | |
348 | { | |
349 | unsigned long flags; | |
509ca1a9 | 350 | |
8006479c | 351 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
509ca1a9 | 352 | |
8006479c DT |
353 | spin_lock_irqsave(&dev->event_lock, flags); |
354 | add_input_randomness(type, code, value); | |
355 | input_handle_event(dev, type, code, value); | |
356 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1da177e4 | 357 | } |
1da177e4 | 358 | } |
ca56fe07 | 359 | EXPORT_SYMBOL(input_event); |
1da177e4 | 360 | |
0e739d28 DT |
361 | /** |
362 | * input_inject_event() - send input event from input handler | |
363 | * @handle: input handle to send event through | |
364 | * @type: type of the event | |
365 | * @code: event code | |
366 | * @value: value of the event | |
367 | * | |
8006479c DT |
368 | * Similar to input_event() but will ignore event if device is |
369 | * "grabbed" and handle injecting event is not the one that owns | |
370 | * the device. | |
0e739d28 | 371 | */ |
8006479c DT |
372 | void input_inject_event(struct input_handle *handle, |
373 | unsigned int type, unsigned int code, int value) | |
1da177e4 | 374 | { |
8006479c DT |
375 | struct input_dev *dev = handle->dev; |
376 | struct input_handle *grab; | |
377 | unsigned long flags; | |
1da177e4 | 378 | |
8006479c DT |
379 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
380 | spin_lock_irqsave(&dev->event_lock, flags); | |
1da177e4 | 381 | |
82ba56c2 | 382 | rcu_read_lock(); |
8006479c DT |
383 | grab = rcu_dereference(dev->grab); |
384 | if (!grab || grab == handle) | |
385 | input_handle_event(dev, type, code, value); | |
82ba56c2 | 386 | rcu_read_unlock(); |
1da177e4 | 387 | |
8006479c DT |
388 | spin_unlock_irqrestore(&dev->event_lock, flags); |
389 | } | |
1da177e4 | 390 | } |
8006479c | 391 | EXPORT_SYMBOL(input_inject_event); |
1da177e4 | 392 | |
8006479c DT |
393 | /** |
394 | * input_grab_device - grabs device for exclusive use | |
395 | * @handle: input handle that wants to own the device | |
396 | * | |
397 | * When a device is grabbed by an input handle all events generated by | |
398 | * the device are delivered only to this handle. Also events injected | |
399 | * by other input handles are ignored while device is grabbed. | |
400 | */ | |
1da177e4 LT |
401 | int input_grab_device(struct input_handle *handle) |
402 | { | |
8006479c DT |
403 | struct input_dev *dev = handle->dev; |
404 | int retval; | |
1da177e4 | 405 | |
8006479c DT |
406 | retval = mutex_lock_interruptible(&dev->mutex); |
407 | if (retval) | |
408 | return retval; | |
409 | ||
410 | if (dev->grab) { | |
411 | retval = -EBUSY; | |
412 | goto out; | |
413 | } | |
414 | ||
415 | rcu_assign_pointer(dev->grab, handle); | |
82ba56c2 | 416 | synchronize_rcu(); |
8006479c DT |
417 | |
418 | out: | |
419 | mutex_unlock(&dev->mutex); | |
420 | return retval; | |
1da177e4 | 421 | } |
ca56fe07 | 422 | EXPORT_SYMBOL(input_grab_device); |
1da177e4 | 423 | |
8006479c | 424 | static void __input_release_device(struct input_handle *handle) |
1da177e4 | 425 | { |
a2b2ed2c | 426 | struct input_dev *dev = handle->dev; |
c7e8dc6e | 427 | |
a2b2ed2c | 428 | if (dev->grab == handle) { |
8006479c DT |
429 | rcu_assign_pointer(dev->grab, NULL); |
430 | /* Make sure input_pass_event() notices that grab is gone */ | |
82ba56c2 | 431 | synchronize_rcu(); |
a2b2ed2c AM |
432 | |
433 | list_for_each_entry(handle, &dev->h_list, d_node) | |
8006479c | 434 | if (handle->open && handle->handler->start) |
c7e8dc6e DT |
435 | handle->handler->start(handle); |
436 | } | |
1da177e4 | 437 | } |
8006479c DT |
438 | |
439 | /** | |
440 | * input_release_device - release previously grabbed device | |
441 | * @handle: input handle that owns the device | |
442 | * | |
443 | * Releases previously grabbed device so that other input handles can | |
444 | * start receiving input events. Upon release all handlers attached | |
445 | * to the device have their start() method called so they have a change | |
446 | * to synchronize device state with the rest of the system. | |
447 | */ | |
448 | void input_release_device(struct input_handle *handle) | |
449 | { | |
450 | struct input_dev *dev = handle->dev; | |
451 | ||
452 | mutex_lock(&dev->mutex); | |
453 | __input_release_device(handle); | |
454 | mutex_unlock(&dev->mutex); | |
455 | } | |
ca56fe07 | 456 | EXPORT_SYMBOL(input_release_device); |
1da177e4 | 457 | |
8006479c DT |
458 | /** |
459 | * input_open_device - open input device | |
460 | * @handle: handle through which device is being accessed | |
461 | * | |
462 | * This function should be called by input handlers when they | |
463 | * want to start receive events from given input device. | |
464 | */ | |
1da177e4 LT |
465 | int input_open_device(struct input_handle *handle) |
466 | { | |
0fbf87ca | 467 | struct input_dev *dev = handle->dev; |
8006479c | 468 | int retval; |
0fbf87ca | 469 | |
8006479c DT |
470 | retval = mutex_lock_interruptible(&dev->mutex); |
471 | if (retval) | |
472 | return retval; | |
473 | ||
474 | if (dev->going_away) { | |
475 | retval = -ENODEV; | |
476 | goto out; | |
477 | } | |
0fbf87ca | 478 | |
1da177e4 | 479 | handle->open++; |
0fbf87ca DT |
480 | |
481 | if (!dev->users++ && dev->open) | |
8006479c DT |
482 | retval = dev->open(dev); |
483 | ||
484 | if (retval) { | |
485 | dev->users--; | |
486 | if (!--handle->open) { | |
487 | /* | |
488 | * Make sure we are not delivering any more events | |
489 | * through this handle | |
490 | */ | |
82ba56c2 | 491 | synchronize_rcu(); |
8006479c DT |
492 | } |
493 | } | |
0fbf87ca | 494 | |
8006479c | 495 | out: |
e676c232 | 496 | mutex_unlock(&dev->mutex); |
8006479c | 497 | return retval; |
1da177e4 | 498 | } |
ca56fe07 | 499 | EXPORT_SYMBOL(input_open_device); |
1da177e4 | 500 | |
8006479c | 501 | int input_flush_device(struct input_handle *handle, struct file *file) |
1da177e4 | 502 | { |
8006479c DT |
503 | struct input_dev *dev = handle->dev; |
504 | int retval; | |
1da177e4 | 505 | |
8006479c DT |
506 | retval = mutex_lock_interruptible(&dev->mutex); |
507 | if (retval) | |
508 | return retval; | |
509 | ||
510 | if (dev->flush) | |
511 | retval = dev->flush(dev, file); | |
512 | ||
513 | mutex_unlock(&dev->mutex); | |
514 | return retval; | |
1da177e4 | 515 | } |
ca56fe07 | 516 | EXPORT_SYMBOL(input_flush_device); |
1da177e4 | 517 | |
8006479c DT |
518 | /** |
519 | * input_close_device - close input device | |
520 | * @handle: handle through which device is being accessed | |
521 | * | |
522 | * This function should be called by input handlers when they | |
523 | * want to stop receive events from given input device. | |
524 | */ | |
1da177e4 LT |
525 | void input_close_device(struct input_handle *handle) |
526 | { | |
0fbf87ca DT |
527 | struct input_dev *dev = handle->dev; |
528 | ||
e676c232 | 529 | mutex_lock(&dev->mutex); |
0fbf87ca | 530 | |
8006479c DT |
531 | __input_release_device(handle); |
532 | ||
0fbf87ca DT |
533 | if (!--dev->users && dev->close) |
534 | dev->close(dev); | |
8006479c DT |
535 | |
536 | if (!--handle->open) { | |
537 | /* | |
82ba56c2 | 538 | * synchronize_rcu() makes sure that input_pass_event() |
8006479c DT |
539 | * completed and that no more input events are delivered |
540 | * through this handle | |
541 | */ | |
82ba56c2 | 542 | synchronize_rcu(); |
8006479c | 543 | } |
0fbf87ca | 544 | |
e676c232 | 545 | mutex_unlock(&dev->mutex); |
1da177e4 | 546 | } |
ca56fe07 | 547 | EXPORT_SYMBOL(input_close_device); |
1da177e4 | 548 | |
866d7d7b ON |
549 | /* |
550 | * Simulate keyup events for all keys that are marked as pressed. | |
551 | * The function must be called with dev->event_lock held. | |
552 | */ | |
553 | static void input_dev_release_keys(struct input_dev *dev) | |
554 | { | |
555 | int code; | |
556 | ||
557 | if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) { | |
558 | for (code = 0; code <= KEY_MAX; code++) { | |
559 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
560 | __test_and_clear_bit(code, dev->key)) { | |
561 | input_pass_event(dev, EV_KEY, code, 0); | |
562 | } | |
563 | } | |
564 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
565 | } | |
566 | } | |
567 | ||
8006479c DT |
568 | /* |
569 | * Prepare device for unregistering | |
570 | */ | |
571 | static void input_disconnect_device(struct input_dev *dev) | |
572 | { | |
573 | struct input_handle *handle; | |
8006479c DT |
574 | |
575 | /* | |
576 | * Mark device as going away. Note that we take dev->mutex here | |
577 | * not to protect access to dev->going_away but rather to ensure | |
578 | * that there are no threads in the middle of input_open_device() | |
579 | */ | |
580 | mutex_lock(&dev->mutex); | |
ffd0db97 | 581 | dev->going_away = true; |
8006479c DT |
582 | mutex_unlock(&dev->mutex); |
583 | ||
584 | spin_lock_irq(&dev->event_lock); | |
585 | ||
586 | /* | |
587 | * Simulate keyup events for all pressed keys so that handlers | |
588 | * are not left with "stuck" keys. The driver may continue | |
589 | * generate events even after we done here but they will not | |
590 | * reach any handlers. | |
591 | */ | |
866d7d7b | 592 | input_dev_release_keys(dev); |
8006479c DT |
593 | |
594 | list_for_each_entry(handle, &dev->h_list, d_node) | |
595 | handle->open = 0; | |
596 | ||
597 | spin_unlock_irq(&dev->event_lock); | |
598 | } | |
599 | ||
c8e4c772 MR |
600 | static int input_fetch_keycode(struct input_dev *dev, int scancode) |
601 | { | |
602 | switch (dev->keycodesize) { | |
603 | case 1: | |
604 | return ((u8 *)dev->keycode)[scancode]; | |
605 | ||
606 | case 2: | |
607 | return ((u16 *)dev->keycode)[scancode]; | |
608 | ||
609 | default: | |
610 | return ((u32 *)dev->keycode)[scancode]; | |
611 | } | |
612 | } | |
613 | ||
614 | static int input_default_getkeycode(struct input_dev *dev, | |
58b93995 DT |
615 | unsigned int scancode, |
616 | unsigned int *keycode) | |
c8e4c772 MR |
617 | { |
618 | if (!dev->keycodesize) | |
619 | return -EINVAL; | |
620 | ||
f4f37c8e | 621 | if (scancode >= dev->keycodemax) |
c8e4c772 MR |
622 | return -EINVAL; |
623 | ||
624 | *keycode = input_fetch_keycode(dev, scancode); | |
625 | ||
626 | return 0; | |
627 | } | |
628 | ||
629 | static int input_default_setkeycode(struct input_dev *dev, | |
58b93995 DT |
630 | unsigned int scancode, |
631 | unsigned int keycode) | |
c8e4c772 MR |
632 | { |
633 | int old_keycode; | |
634 | int i; | |
635 | ||
f4f37c8e | 636 | if (scancode >= dev->keycodemax) |
c8e4c772 MR |
637 | return -EINVAL; |
638 | ||
639 | if (!dev->keycodesize) | |
640 | return -EINVAL; | |
641 | ||
642 | if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8))) | |
643 | return -EINVAL; | |
644 | ||
645 | switch (dev->keycodesize) { | |
646 | case 1: { | |
647 | u8 *k = (u8 *)dev->keycode; | |
648 | old_keycode = k[scancode]; | |
649 | k[scancode] = keycode; | |
650 | break; | |
651 | } | |
652 | case 2: { | |
653 | u16 *k = (u16 *)dev->keycode; | |
654 | old_keycode = k[scancode]; | |
655 | k[scancode] = keycode; | |
656 | break; | |
657 | } | |
658 | default: { | |
659 | u32 *k = (u32 *)dev->keycode; | |
660 | old_keycode = k[scancode]; | |
661 | k[scancode] = keycode; | |
662 | break; | |
663 | } | |
664 | } | |
665 | ||
4f93df40 DT |
666 | __clear_bit(old_keycode, dev->keybit); |
667 | __set_bit(keycode, dev->keybit); | |
c8e4c772 MR |
668 | |
669 | for (i = 0; i < dev->keycodemax; i++) { | |
670 | if (input_fetch_keycode(dev, i) == old_keycode) { | |
4f93df40 | 671 | __set_bit(old_keycode, dev->keybit); |
c8e4c772 MR |
672 | break; /* Setting the bit twice is useless, so break */ |
673 | } | |
674 | } | |
675 | ||
676 | return 0; | |
677 | } | |
678 | ||
f4f37c8e DT |
679 | /** |
680 | * input_get_keycode - retrieve keycode currently mapped to a given scancode | |
681 | * @dev: input device which keymap is being queried | |
682 | * @scancode: scancode (or its equivalent for device in question) for which | |
683 | * keycode is needed | |
684 | * @keycode: result | |
685 | * | |
686 | * This function should be called by anyone interested in retrieving current | |
687 | * keymap. Presently keyboard and evdev handlers use it. | |
688 | */ | |
58b93995 DT |
689 | int input_get_keycode(struct input_dev *dev, |
690 | unsigned int scancode, unsigned int *keycode) | |
f4f37c8e | 691 | { |
2e2e3b96 DT |
692 | unsigned long flags; |
693 | int retval; | |
694 | ||
695 | spin_lock_irqsave(&dev->event_lock, flags); | |
696 | retval = dev->getkeycode(dev, scancode, keycode); | |
697 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
698 | ||
699 | return retval; | |
f4f37c8e DT |
700 | } |
701 | EXPORT_SYMBOL(input_get_keycode); | |
702 | ||
703 | /** | |
704 | * input_get_keycode - assign new keycode to a given scancode | |
705 | * @dev: input device which keymap is being updated | |
706 | * @scancode: scancode (or its equivalent for device in question) | |
707 | * @keycode: new keycode to be assigned to the scancode | |
708 | * | |
709 | * This function should be called by anyone needing to update current | |
710 | * keymap. Presently keyboard and evdev handlers use it. | |
711 | */ | |
58b93995 DT |
712 | int input_set_keycode(struct input_dev *dev, |
713 | unsigned int scancode, unsigned int keycode) | |
f4f37c8e DT |
714 | { |
715 | unsigned long flags; | |
fd6cf3dd | 716 | unsigned int old_keycode; |
f4f37c8e DT |
717 | int retval; |
718 | ||
58b93995 | 719 | if (keycode > KEY_MAX) |
f4f37c8e DT |
720 | return -EINVAL; |
721 | ||
722 | spin_lock_irqsave(&dev->event_lock, flags); | |
723 | ||
724 | retval = dev->getkeycode(dev, scancode, &old_keycode); | |
725 | if (retval) | |
726 | goto out; | |
727 | ||
728 | retval = dev->setkeycode(dev, scancode, keycode); | |
729 | if (retval) | |
730 | goto out; | |
731 | ||
4f93df40 DT |
732 | /* Make sure KEY_RESERVED did not get enabled. */ |
733 | __clear_bit(KEY_RESERVED, dev->keybit); | |
734 | ||
f4f37c8e DT |
735 | /* |
736 | * Simulate keyup event if keycode is not present | |
737 | * in the keymap anymore | |
738 | */ | |
739 | if (test_bit(EV_KEY, dev->evbit) && | |
740 | !is_event_supported(old_keycode, dev->keybit, KEY_MAX) && | |
741 | __test_and_clear_bit(old_keycode, dev->key)) { | |
742 | ||
743 | input_pass_event(dev, EV_KEY, old_keycode, 0); | |
744 | if (dev->sync) | |
745 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
746 | } | |
747 | ||
748 | out: | |
749 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
750 | ||
751 | return retval; | |
752 | } | |
753 | EXPORT_SYMBOL(input_set_keycode); | |
c8e4c772 | 754 | |
1da177e4 | 755 | #define MATCH_BIT(bit, max) \ |
7b19ada2 | 756 | for (i = 0; i < BITS_TO_LONGS(max); i++) \ |
1da177e4 LT |
757 | if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \ |
758 | break; \ | |
7b19ada2 | 759 | if (i != BITS_TO_LONGS(max)) \ |
1da177e4 LT |
760 | continue; |
761 | ||
0b7024ac | 762 | static const struct input_device_id *input_match_device(struct input_handler *handler, |
66e66118 | 763 | struct input_dev *dev) |
1da177e4 | 764 | { |
0b7024ac | 765 | const struct input_device_id *id; |
1da177e4 LT |
766 | int i; |
767 | ||
0b7024ac | 768 | for (id = handler->id_table; id->flags || id->driver_info; id++) { |
1da177e4 LT |
769 | |
770 | if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) | |
ddc5d341 | 771 | if (id->bustype != dev->id.bustype) |
1da177e4 LT |
772 | continue; |
773 | ||
774 | if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) | |
ddc5d341 | 775 | if (id->vendor != dev->id.vendor) |
1da177e4 LT |
776 | continue; |
777 | ||
778 | if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) | |
ddc5d341 | 779 | if (id->product != dev->id.product) |
1da177e4 LT |
780 | continue; |
781 | ||
782 | if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) | |
ddc5d341 | 783 | if (id->version != dev->id.version) |
1da177e4 LT |
784 | continue; |
785 | ||
786 | MATCH_BIT(evbit, EV_MAX); | |
787 | MATCH_BIT(keybit, KEY_MAX); | |
788 | MATCH_BIT(relbit, REL_MAX); | |
789 | MATCH_BIT(absbit, ABS_MAX); | |
790 | MATCH_BIT(mscbit, MSC_MAX); | |
791 | MATCH_BIT(ledbit, LED_MAX); | |
792 | MATCH_BIT(sndbit, SND_MAX); | |
793 | MATCH_BIT(ffbit, FF_MAX); | |
ff13f98b | 794 | MATCH_BIT(swbit, SW_MAX); |
1da177e4 | 795 | |
0b7024ac DT |
796 | if (!handler->match || handler->match(handler, dev)) |
797 | return id; | |
1da177e4 LT |
798 | } |
799 | ||
800 | return NULL; | |
801 | } | |
802 | ||
5b2a0826 DT |
803 | static int input_attach_handler(struct input_dev *dev, struct input_handler *handler) |
804 | { | |
805 | const struct input_device_id *id; | |
806 | int error; | |
807 | ||
0b7024ac | 808 | id = input_match_device(handler, dev); |
5b2a0826 DT |
809 | if (!id) |
810 | return -ENODEV; | |
811 | ||
812 | error = handler->connect(handler, dev, id); | |
813 | if (error && error != -ENODEV) | |
814 | printk(KERN_ERR | |
815 | "input: failed to attach handler %s to device %s, " | |
816 | "error: %d\n", | |
9657d75c | 817 | handler->name, kobject_name(&dev->dev.kobj), error); |
5b2a0826 DT |
818 | |
819 | return error; | |
820 | } | |
821 | ||
15e184af DT |
822 | #ifdef CONFIG_COMPAT |
823 | ||
824 | static int input_bits_to_string(char *buf, int buf_size, | |
825 | unsigned long bits, bool skip_empty) | |
826 | { | |
827 | int len = 0; | |
828 | ||
829 | if (INPUT_COMPAT_TEST) { | |
830 | u32 dword = bits >> 32; | |
831 | if (dword || !skip_empty) | |
832 | len += snprintf(buf, buf_size, "%x ", dword); | |
833 | ||
834 | dword = bits & 0xffffffffUL; | |
835 | if (dword || !skip_empty || len) | |
836 | len += snprintf(buf + len, max(buf_size - len, 0), | |
837 | "%x", dword); | |
838 | } else { | |
839 | if (bits || !skip_empty) | |
840 | len += snprintf(buf, buf_size, "%lx", bits); | |
841 | } | |
842 | ||
843 | return len; | |
844 | } | |
845 | ||
846 | #else /* !CONFIG_COMPAT */ | |
847 | ||
848 | static int input_bits_to_string(char *buf, int buf_size, | |
849 | unsigned long bits, bool skip_empty) | |
850 | { | |
851 | return bits || !skip_empty ? | |
852 | snprintf(buf, buf_size, "%lx", bits) : 0; | |
853 | } | |
854 | ||
855 | #endif | |
5b2a0826 | 856 | |
f96b434d DT |
857 | #ifdef CONFIG_PROC_FS |
858 | ||
859 | static struct proc_dir_entry *proc_bus_input_dir; | |
860 | static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); | |
861 | static int input_devices_state; | |
862 | ||
863 | static inline void input_wakeup_procfs_readers(void) | |
864 | { | |
865 | input_devices_state++; | |
866 | wake_up(&input_devices_poll_wait); | |
867 | } | |
868 | ||
969b21cd | 869 | static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait) |
f96b434d | 870 | { |
f96b434d | 871 | poll_wait(file, &input_devices_poll_wait, wait); |
fa886612 DT |
872 | if (file->f_version != input_devices_state) { |
873 | file->f_version = input_devices_state; | |
f96b434d | 874 | return POLLIN | POLLRDNORM; |
fa886612 | 875 | } |
1e0afb28 | 876 | |
f96b434d DT |
877 | return 0; |
878 | } | |
879 | ||
1572ca2a DT |
880 | union input_seq_state { |
881 | struct { | |
882 | unsigned short pos; | |
883 | bool mutex_acquired; | |
884 | }; | |
885 | void *p; | |
886 | }; | |
887 | ||
969b21cd DT |
888 | static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) |
889 | { | |
1572ca2a DT |
890 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
891 | int error; | |
892 | ||
893 | /* We need to fit into seq->private pointer */ | |
894 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
895 | ||
896 | error = mutex_lock_interruptible(&input_mutex); | |
897 | if (error) { | |
898 | state->mutex_acquired = false; | |
899 | return ERR_PTR(error); | |
900 | } | |
901 | ||
902 | state->mutex_acquired = true; | |
f96b434d | 903 | |
ad5d972c | 904 | return seq_list_start(&input_dev_list, *pos); |
969b21cd | 905 | } |
051b2fea | 906 | |
969b21cd DT |
907 | static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
908 | { | |
ad5d972c | 909 | return seq_list_next(v, &input_dev_list, pos); |
969b21cd | 910 | } |
f96b434d | 911 | |
1572ca2a | 912 | static void input_seq_stop(struct seq_file *seq, void *v) |
969b21cd | 913 | { |
1572ca2a DT |
914 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
915 | ||
916 | if (state->mutex_acquired) | |
917 | mutex_unlock(&input_mutex); | |
969b21cd | 918 | } |
f96b434d | 919 | |
969b21cd DT |
920 | static void input_seq_print_bitmap(struct seq_file *seq, const char *name, |
921 | unsigned long *bitmap, int max) | |
922 | { | |
923 | int i; | |
15e184af DT |
924 | bool skip_empty = true; |
925 | char buf[18]; | |
f96b434d | 926 | |
969b21cd | 927 | seq_printf(seq, "B: %s=", name); |
15e184af DT |
928 | |
929 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
930 | if (input_bits_to_string(buf, sizeof(buf), | |
931 | bitmap[i], skip_empty)) { | |
932 | skip_empty = false; | |
933 | seq_printf(seq, "%s%s", buf, i > 0 ? " " : ""); | |
934 | } | |
935 | } | |
936 | ||
937 | /* | |
938 | * If no output was produced print a single 0. | |
939 | */ | |
940 | if (skip_empty) | |
941 | seq_puts(seq, "0"); | |
942 | ||
969b21cd DT |
943 | seq_putc(seq, '\n'); |
944 | } | |
f96b434d | 945 | |
969b21cd DT |
946 | static int input_devices_seq_show(struct seq_file *seq, void *v) |
947 | { | |
948 | struct input_dev *dev = container_of(v, struct input_dev, node); | |
9657d75c | 949 | const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
969b21cd DT |
950 | struct input_handle *handle; |
951 | ||
952 | seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", | |
953 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); | |
954 | ||
955 | seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); | |
956 | seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : ""); | |
957 | seq_printf(seq, "S: Sysfs=%s\n", path ? path : ""); | |
15e03ae8 | 958 | seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : ""); |
969b21cd DT |
959 | seq_printf(seq, "H: Handlers="); |
960 | ||
961 | list_for_each_entry(handle, &dev->h_list, d_node) | |
962 | seq_printf(seq, "%s ", handle->name); | |
963 | seq_putc(seq, '\n'); | |
964 | ||
965 | input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); | |
966 | if (test_bit(EV_KEY, dev->evbit)) | |
967 | input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); | |
968 | if (test_bit(EV_REL, dev->evbit)) | |
969 | input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); | |
970 | if (test_bit(EV_ABS, dev->evbit)) | |
971 | input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); | |
972 | if (test_bit(EV_MSC, dev->evbit)) | |
973 | input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); | |
974 | if (test_bit(EV_LED, dev->evbit)) | |
975 | input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); | |
976 | if (test_bit(EV_SND, dev->evbit)) | |
977 | input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); | |
978 | if (test_bit(EV_FF, dev->evbit)) | |
979 | input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); | |
980 | if (test_bit(EV_SW, dev->evbit)) | |
981 | input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); | |
982 | ||
983 | seq_putc(seq, '\n'); | |
984 | ||
985 | kfree(path); | |
986 | return 0; | |
f96b434d DT |
987 | } |
988 | ||
cec69c37 | 989 | static const struct seq_operations input_devices_seq_ops = { |
969b21cd DT |
990 | .start = input_devices_seq_start, |
991 | .next = input_devices_seq_next, | |
1572ca2a | 992 | .stop = input_seq_stop, |
969b21cd DT |
993 | .show = input_devices_seq_show, |
994 | }; | |
995 | ||
996 | static int input_proc_devices_open(struct inode *inode, struct file *file) | |
f96b434d | 997 | { |
969b21cd DT |
998 | return seq_open(file, &input_devices_seq_ops); |
999 | } | |
1000 | ||
2b8693c0 | 1001 | static const struct file_operations input_devices_fileops = { |
969b21cd DT |
1002 | .owner = THIS_MODULE, |
1003 | .open = input_proc_devices_open, | |
1004 | .poll = input_proc_devices_poll, | |
1005 | .read = seq_read, | |
1006 | .llseek = seq_lseek, | |
1007 | .release = seq_release, | |
1008 | }; | |
1009 | ||
1010 | static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) | |
1011 | { | |
1572ca2a DT |
1012 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1013 | int error; | |
1014 | ||
1015 | /* We need to fit into seq->private pointer */ | |
1016 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
1017 | ||
1018 | error = mutex_lock_interruptible(&input_mutex); | |
1019 | if (error) { | |
1020 | state->mutex_acquired = false; | |
1021 | return ERR_PTR(error); | |
1022 | } | |
1023 | ||
1024 | state->mutex_acquired = true; | |
1025 | state->pos = *pos; | |
8006479c | 1026 | |
ad5d972c | 1027 | return seq_list_start(&input_handler_list, *pos); |
969b21cd | 1028 | } |
f96b434d | 1029 | |
969b21cd DT |
1030 | static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1031 | { | |
1572ca2a | 1032 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
f96b434d | 1033 | |
1572ca2a DT |
1034 | state->pos = *pos + 1; |
1035 | return seq_list_next(v, &input_handler_list, pos); | |
969b21cd DT |
1036 | } |
1037 | ||
1038 | static int input_handlers_seq_show(struct seq_file *seq, void *v) | |
1039 | { | |
1040 | struct input_handler *handler = container_of(v, struct input_handler, node); | |
1572ca2a | 1041 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
969b21cd | 1042 | |
1572ca2a | 1043 | seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name); |
ef7995f4 DT |
1044 | if (handler->filter) |
1045 | seq_puts(seq, " (filter)"); | |
969b21cd DT |
1046 | if (handler->fops) |
1047 | seq_printf(seq, " Minor=%d", handler->minor); | |
1048 | seq_putc(seq, '\n'); | |
1049 | ||
1050 | return 0; | |
1051 | } | |
1572ca2a | 1052 | |
cec69c37 | 1053 | static const struct seq_operations input_handlers_seq_ops = { |
969b21cd DT |
1054 | .start = input_handlers_seq_start, |
1055 | .next = input_handlers_seq_next, | |
1572ca2a | 1056 | .stop = input_seq_stop, |
969b21cd DT |
1057 | .show = input_handlers_seq_show, |
1058 | }; | |
1059 | ||
1060 | static int input_proc_handlers_open(struct inode *inode, struct file *file) | |
1061 | { | |
1062 | return seq_open(file, &input_handlers_seq_ops); | |
1063 | } | |
1064 | ||
2b8693c0 | 1065 | static const struct file_operations input_handlers_fileops = { |
969b21cd DT |
1066 | .owner = THIS_MODULE, |
1067 | .open = input_proc_handlers_open, | |
1068 | .read = seq_read, | |
1069 | .llseek = seq_lseek, | |
1070 | .release = seq_release, | |
1071 | }; | |
f96b434d DT |
1072 | |
1073 | static int __init input_proc_init(void) | |
1074 | { | |
1075 | struct proc_dir_entry *entry; | |
1076 | ||
9c37066d | 1077 | proc_bus_input_dir = proc_mkdir("bus/input", NULL); |
f96b434d DT |
1078 | if (!proc_bus_input_dir) |
1079 | return -ENOMEM; | |
1080 | ||
c7705f34 DL |
1081 | entry = proc_create("devices", 0, proc_bus_input_dir, |
1082 | &input_devices_fileops); | |
f96b434d DT |
1083 | if (!entry) |
1084 | goto fail1; | |
1085 | ||
c7705f34 DL |
1086 | entry = proc_create("handlers", 0, proc_bus_input_dir, |
1087 | &input_handlers_fileops); | |
f96b434d DT |
1088 | if (!entry) |
1089 | goto fail2; | |
1090 | ||
f96b434d DT |
1091 | return 0; |
1092 | ||
1093 | fail2: remove_proc_entry("devices", proc_bus_input_dir); | |
9c37066d | 1094 | fail1: remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1095 | return -ENOMEM; |
1096 | } | |
1097 | ||
beffbdc2 | 1098 | static void input_proc_exit(void) |
f96b434d DT |
1099 | { |
1100 | remove_proc_entry("devices", proc_bus_input_dir); | |
1101 | remove_proc_entry("handlers", proc_bus_input_dir); | |
9c37066d | 1102 | remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1103 | } |
1104 | ||
1105 | #else /* !CONFIG_PROC_FS */ | |
1106 | static inline void input_wakeup_procfs_readers(void) { } | |
1107 | static inline int input_proc_init(void) { return 0; } | |
1108 | static inline void input_proc_exit(void) { } | |
1109 | #endif | |
1110 | ||
9657d75c DT |
1111 | #define INPUT_DEV_STRING_ATTR_SHOW(name) \ |
1112 | static ssize_t input_dev_show_##name(struct device *dev, \ | |
1113 | struct device_attribute *attr, \ | |
1114 | char *buf) \ | |
1115 | { \ | |
1116 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1117 | \ | |
1118 | return scnprintf(buf, PAGE_SIZE, "%s\n", \ | |
1119 | input_dev->name ? input_dev->name : ""); \ | |
1120 | } \ | |
1121 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL) | |
5c1e9a6a DT |
1122 | |
1123 | INPUT_DEV_STRING_ATTR_SHOW(name); | |
1124 | INPUT_DEV_STRING_ATTR_SHOW(phys); | |
1125 | INPUT_DEV_STRING_ATTR_SHOW(uniq); | |
1126 | ||
ac648a6a DT |
1127 | static int input_print_modalias_bits(char *buf, int size, |
1128 | char name, unsigned long *bm, | |
1129 | unsigned int min_bit, unsigned int max_bit) | |
1d8f430c | 1130 | { |
ac648a6a | 1131 | int len = 0, i; |
1d8f430c | 1132 | |
ac648a6a DT |
1133 | len += snprintf(buf, max(size, 0), "%c", name); |
1134 | for (i = min_bit; i < max_bit; i++) | |
7b19ada2 | 1135 | if (bm[BIT_WORD(i)] & BIT_MASK(i)) |
ac648a6a | 1136 | len += snprintf(buf + len, max(size - len, 0), "%X,", i); |
1d8f430c RR |
1137 | return len; |
1138 | } | |
1139 | ||
2db66876 DT |
1140 | static int input_print_modalias(char *buf, int size, struct input_dev *id, |
1141 | int add_cr) | |
1d8f430c | 1142 | { |
bd37e5a9 | 1143 | int len; |
1d8f430c | 1144 | |
ac648a6a DT |
1145 | len = snprintf(buf, max(size, 0), |
1146 | "input:b%04Xv%04Xp%04Xe%04X-", | |
1147 | id->id.bustype, id->id.vendor, | |
1148 | id->id.product, id->id.version); | |
1149 | ||
1150 | len += input_print_modalias_bits(buf + len, size - len, | |
1151 | 'e', id->evbit, 0, EV_MAX); | |
1152 | len += input_print_modalias_bits(buf + len, size - len, | |
1153 | 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); | |
1154 | len += input_print_modalias_bits(buf + len, size - len, | |
1155 | 'r', id->relbit, 0, REL_MAX); | |
1156 | len += input_print_modalias_bits(buf + len, size - len, | |
1157 | 'a', id->absbit, 0, ABS_MAX); | |
1158 | len += input_print_modalias_bits(buf + len, size - len, | |
1159 | 'm', id->mscbit, 0, MSC_MAX); | |
1160 | len += input_print_modalias_bits(buf + len, size - len, | |
1161 | 'l', id->ledbit, 0, LED_MAX); | |
1162 | len += input_print_modalias_bits(buf + len, size - len, | |
1163 | 's', id->sndbit, 0, SND_MAX); | |
1164 | len += input_print_modalias_bits(buf + len, size - len, | |
1165 | 'f', id->ffbit, 0, FF_MAX); | |
1166 | len += input_print_modalias_bits(buf + len, size - len, | |
1167 | 'w', id->swbit, 0, SW_MAX); | |
2db66876 DT |
1168 | |
1169 | if (add_cr) | |
ac648a6a | 1170 | len += snprintf(buf + len, max(size - len, 0), "\n"); |
2db66876 | 1171 | |
bd37e5a9 KS |
1172 | return len; |
1173 | } | |
1174 | ||
9657d75c DT |
1175 | static ssize_t input_dev_show_modalias(struct device *dev, |
1176 | struct device_attribute *attr, | |
1177 | char *buf) | |
bd37e5a9 KS |
1178 | { |
1179 | struct input_dev *id = to_input_dev(dev); | |
1180 | ssize_t len; | |
1181 | ||
2db66876 DT |
1182 | len = input_print_modalias(buf, PAGE_SIZE, id, 1); |
1183 | ||
8a3cf456 | 1184 | return min_t(int, len, PAGE_SIZE); |
1d8f430c | 1185 | } |
9657d75c | 1186 | static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); |
1d8f430c | 1187 | |
629b77a4 | 1188 | static struct attribute *input_dev_attrs[] = { |
9657d75c DT |
1189 | &dev_attr_name.attr, |
1190 | &dev_attr_phys.attr, | |
1191 | &dev_attr_uniq.attr, | |
1192 | &dev_attr_modalias.attr, | |
629b77a4 GKH |
1193 | NULL |
1194 | }; | |
1195 | ||
bd0ef235 | 1196 | static struct attribute_group input_dev_attr_group = { |
629b77a4 | 1197 | .attrs = input_dev_attrs, |
5c1e9a6a DT |
1198 | }; |
1199 | ||
9657d75c DT |
1200 | #define INPUT_DEV_ID_ATTR(name) \ |
1201 | static ssize_t input_dev_show_id_##name(struct device *dev, \ | |
1202 | struct device_attribute *attr, \ | |
1203 | char *buf) \ | |
1204 | { \ | |
1205 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1206 | return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \ | |
1207 | } \ | |
1208 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL) | |
5c1e9a6a DT |
1209 | |
1210 | INPUT_DEV_ID_ATTR(bustype); | |
1211 | INPUT_DEV_ID_ATTR(vendor); | |
1212 | INPUT_DEV_ID_ATTR(product); | |
1213 | INPUT_DEV_ID_ATTR(version); | |
1214 | ||
1215 | static struct attribute *input_dev_id_attrs[] = { | |
9657d75c DT |
1216 | &dev_attr_bustype.attr, |
1217 | &dev_attr_vendor.attr, | |
1218 | &dev_attr_product.attr, | |
1219 | &dev_attr_version.attr, | |
5c1e9a6a DT |
1220 | NULL |
1221 | }; | |
1222 | ||
1223 | static struct attribute_group input_dev_id_attr_group = { | |
1224 | .name = "id", | |
1225 | .attrs = input_dev_id_attrs, | |
1226 | }; | |
1227 | ||
969b21cd DT |
1228 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1229 | int max, int add_cr) | |
1230 | { | |
1231 | int i; | |
1232 | int len = 0; | |
15e184af DT |
1233 | bool skip_empty = true; |
1234 | ||
1235 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
1236 | len += input_bits_to_string(buf + len, max(buf_size - len, 0), | |
1237 | bitmap[i], skip_empty); | |
1238 | if (len) { | |
1239 | skip_empty = false; | |
1240 | if (i > 0) | |
1241 | len += snprintf(buf + len, max(buf_size - len, 0), " "); | |
1242 | } | |
1243 | } | |
969b21cd | 1244 | |
15e184af DT |
1245 | /* |
1246 | * If no output was produced print a single 0. | |
1247 | */ | |
1248 | if (len == 0) | |
1249 | len = snprintf(buf, buf_size, "%d", 0); | |
969b21cd DT |
1250 | |
1251 | if (add_cr) | |
1252 | len += snprintf(buf + len, max(buf_size - len, 0), "\n"); | |
1253 | ||
1254 | return len; | |
1255 | } | |
1256 | ||
9657d75c DT |
1257 | #define INPUT_DEV_CAP_ATTR(ev, bm) \ |
1258 | static ssize_t input_dev_show_cap_##bm(struct device *dev, \ | |
1259 | struct device_attribute *attr, \ | |
1260 | char *buf) \ | |
1261 | { \ | |
1262 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1263 | int len = input_print_bitmap(buf, PAGE_SIZE, \ | |
15e184af DT |
1264 | input_dev->bm##bit, ev##_MAX, \ |
1265 | true); \ | |
9657d75c DT |
1266 | return min_t(int, len, PAGE_SIZE); \ |
1267 | } \ | |
1268 | static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL) | |
5c1e9a6a DT |
1269 | |
1270 | INPUT_DEV_CAP_ATTR(EV, ev); | |
1271 | INPUT_DEV_CAP_ATTR(KEY, key); | |
1272 | INPUT_DEV_CAP_ATTR(REL, rel); | |
1273 | INPUT_DEV_CAP_ATTR(ABS, abs); | |
1274 | INPUT_DEV_CAP_ATTR(MSC, msc); | |
1275 | INPUT_DEV_CAP_ATTR(LED, led); | |
1276 | INPUT_DEV_CAP_ATTR(SND, snd); | |
1277 | INPUT_DEV_CAP_ATTR(FF, ff); | |
1278 | INPUT_DEV_CAP_ATTR(SW, sw); | |
1279 | ||
1280 | static struct attribute *input_dev_caps_attrs[] = { | |
9657d75c DT |
1281 | &dev_attr_ev.attr, |
1282 | &dev_attr_key.attr, | |
1283 | &dev_attr_rel.attr, | |
1284 | &dev_attr_abs.attr, | |
1285 | &dev_attr_msc.attr, | |
1286 | &dev_attr_led.attr, | |
1287 | &dev_attr_snd.attr, | |
1288 | &dev_attr_ff.attr, | |
1289 | &dev_attr_sw.attr, | |
5c1e9a6a DT |
1290 | NULL |
1291 | }; | |
1292 | ||
1293 | static struct attribute_group input_dev_caps_attr_group = { | |
1294 | .name = "capabilities", | |
1295 | .attrs = input_dev_caps_attrs, | |
1296 | }; | |
1297 | ||
a4dbd674 | 1298 | static const struct attribute_group *input_dev_attr_groups[] = { |
cb9def4d DT |
1299 | &input_dev_attr_group, |
1300 | &input_dev_id_attr_group, | |
1301 | &input_dev_caps_attr_group, | |
1302 | NULL | |
1303 | }; | |
1304 | ||
9657d75c | 1305 | static void input_dev_release(struct device *device) |
d19fbe8a | 1306 | { |
9657d75c | 1307 | struct input_dev *dev = to_input_dev(device); |
d19fbe8a | 1308 | |
509ca1a9 | 1309 | input_ff_destroy(dev); |
40d007e7 | 1310 | input_mt_destroy_slots(dev); |
d19fbe8a | 1311 | kfree(dev); |
509ca1a9 | 1312 | |
d19fbe8a DT |
1313 | module_put(THIS_MODULE); |
1314 | } | |
1315 | ||
a7fadbe1 | 1316 | /* |
312c004d | 1317 | * Input uevent interface - loading event handlers based on |
a7fadbe1 DT |
1318 | * device bitfields. |
1319 | */ | |
7eff2e7a | 1320 | static int input_add_uevent_bm_var(struct kobj_uevent_env *env, |
ac648a6a | 1321 | const char *name, unsigned long *bitmap, int max) |
a7fadbe1 | 1322 | { |
7eff2e7a | 1323 | int len; |
a7fadbe1 | 1324 | |
7eff2e7a | 1325 | if (add_uevent_var(env, "%s=", name)) |
a7fadbe1 DT |
1326 | return -ENOMEM; |
1327 | ||
7eff2e7a KS |
1328 | len = input_print_bitmap(&env->buf[env->buflen - 1], |
1329 | sizeof(env->buf) - env->buflen, | |
15e184af | 1330 | bitmap, max, false); |
7eff2e7a | 1331 | if (len >= (sizeof(env->buf) - env->buflen)) |
a7fadbe1 DT |
1332 | return -ENOMEM; |
1333 | ||
7eff2e7a | 1334 | env->buflen += len; |
a7fadbe1 DT |
1335 | return 0; |
1336 | } | |
1337 | ||
7eff2e7a | 1338 | static int input_add_uevent_modalias_var(struct kobj_uevent_env *env, |
ac648a6a DT |
1339 | struct input_dev *dev) |
1340 | { | |
7eff2e7a | 1341 | int len; |
ac648a6a | 1342 | |
7eff2e7a | 1343 | if (add_uevent_var(env, "MODALIAS=")) |
ac648a6a DT |
1344 | return -ENOMEM; |
1345 | ||
7eff2e7a KS |
1346 | len = input_print_modalias(&env->buf[env->buflen - 1], |
1347 | sizeof(env->buf) - env->buflen, | |
1348 | dev, 0); | |
1349 | if (len >= (sizeof(env->buf) - env->buflen)) | |
ac648a6a DT |
1350 | return -ENOMEM; |
1351 | ||
7eff2e7a | 1352 | env->buflen += len; |
ac648a6a DT |
1353 | return 0; |
1354 | } | |
1355 | ||
a7fadbe1 DT |
1356 | #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \ |
1357 | do { \ | |
7eff2e7a | 1358 | int err = add_uevent_var(env, fmt, val); \ |
a7fadbe1 DT |
1359 | if (err) \ |
1360 | return err; \ | |
1361 | } while (0) | |
1362 | ||
1363 | #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \ | |
1364 | do { \ | |
7eff2e7a | 1365 | int err = input_add_uevent_bm_var(env, name, bm, max); \ |
a7fadbe1 DT |
1366 | if (err) \ |
1367 | return err; \ | |
1368 | } while (0) | |
1369 | ||
ac648a6a DT |
1370 | #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \ |
1371 | do { \ | |
7eff2e7a | 1372 | int err = input_add_uevent_modalias_var(env, dev); \ |
ac648a6a DT |
1373 | if (err) \ |
1374 | return err; \ | |
1375 | } while (0) | |
1376 | ||
7eff2e7a | 1377 | static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env) |
a7fadbe1 | 1378 | { |
9657d75c | 1379 | struct input_dev *dev = to_input_dev(device); |
a7fadbe1 DT |
1380 | |
1381 | INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x", | |
1382 | dev->id.bustype, dev->id.vendor, | |
1383 | dev->id.product, dev->id.version); | |
1384 | if (dev->name) | |
1385 | INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); | |
1386 | if (dev->phys) | |
1387 | INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); | |
08de1f04 | 1388 | if (dev->uniq) |
a7fadbe1 DT |
1389 | INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); |
1390 | ||
1391 | INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX); | |
1392 | if (test_bit(EV_KEY, dev->evbit)) | |
1393 | INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX); | |
1394 | if (test_bit(EV_REL, dev->evbit)) | |
1395 | INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX); | |
1396 | if (test_bit(EV_ABS, dev->evbit)) | |
1397 | INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX); | |
1398 | if (test_bit(EV_MSC, dev->evbit)) | |
1399 | INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX); | |
1400 | if (test_bit(EV_LED, dev->evbit)) | |
1401 | INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX); | |
1402 | if (test_bit(EV_SND, dev->evbit)) | |
1403 | INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX); | |
1404 | if (test_bit(EV_FF, dev->evbit)) | |
1405 | INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX); | |
1406 | if (test_bit(EV_SW, dev->evbit)) | |
1407 | INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); | |
1408 | ||
ac648a6a | 1409 | INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); |
a7fadbe1 DT |
1410 | |
1411 | return 0; | |
1412 | } | |
1413 | ||
3cc96351 DT |
1414 | #define INPUT_DO_TOGGLE(dev, type, bits, on) \ |
1415 | do { \ | |
1416 | int i; \ | |
1417 | bool active; \ | |
1418 | \ | |
1419 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1420 | break; \ | |
1421 | \ | |
1422 | for (i = 0; i < type##_MAX; i++) { \ | |
1423 | if (!test_bit(i, dev->bits##bit)) \ | |
1424 | continue; \ | |
1425 | \ | |
1426 | active = test_bit(i, dev->bits); \ | |
1427 | if (!active && !on) \ | |
1428 | continue; \ | |
1429 | \ | |
1430 | dev->event(dev, EV_##type, i, on ? active : 0); \ | |
1431 | } \ | |
ffd0db97 DT |
1432 | } while (0) |
1433 | ||
1c4115e5 | 1434 | #ifdef CONFIG_PM |
ffd0db97 DT |
1435 | static void input_dev_reset(struct input_dev *dev, bool activate) |
1436 | { | |
1437 | if (!dev->event) | |
1438 | return; | |
1439 | ||
1440 | INPUT_DO_TOGGLE(dev, LED, led, activate); | |
1441 | INPUT_DO_TOGGLE(dev, SND, snd, activate); | |
1442 | ||
1443 | if (activate && test_bit(EV_REP, dev->evbit)) { | |
1444 | dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]); | |
1445 | dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]); | |
1446 | } | |
1447 | } | |
1448 | ||
ffd0db97 DT |
1449 | static int input_dev_suspend(struct device *dev) |
1450 | { | |
1451 | struct input_dev *input_dev = to_input_dev(dev); | |
1452 | ||
1453 | mutex_lock(&input_dev->mutex); | |
1454 | input_dev_reset(input_dev, false); | |
1455 | mutex_unlock(&input_dev->mutex); | |
1456 | ||
1457 | return 0; | |
1458 | } | |
1459 | ||
1460 | static int input_dev_resume(struct device *dev) | |
1461 | { | |
1462 | struct input_dev *input_dev = to_input_dev(dev); | |
1463 | ||
1464 | mutex_lock(&input_dev->mutex); | |
1465 | input_dev_reset(input_dev, true); | |
866d7d7b ON |
1466 | |
1467 | /* | |
1468 | * Keys that have been pressed at suspend time are unlikely | |
1469 | * to be still pressed when we resume. | |
1470 | */ | |
1471 | spin_lock_irq(&input_dev->event_lock); | |
1472 | input_dev_release_keys(input_dev); | |
1473 | spin_unlock_irq(&input_dev->event_lock); | |
1474 | ||
ffd0db97 DT |
1475 | mutex_unlock(&input_dev->mutex); |
1476 | ||
1477 | return 0; | |
1478 | } | |
1479 | ||
1480 | static const struct dev_pm_ops input_dev_pm_ops = { | |
1481 | .suspend = input_dev_suspend, | |
1482 | .resume = input_dev_resume, | |
1483 | .poweroff = input_dev_suspend, | |
1484 | .restore = input_dev_resume, | |
1485 | }; | |
1486 | #endif /* CONFIG_PM */ | |
1487 | ||
9657d75c DT |
1488 | static struct device_type input_dev_type = { |
1489 | .groups = input_dev_attr_groups, | |
1490 | .release = input_dev_release, | |
1491 | .uevent = input_dev_uevent, | |
ffd0db97 DT |
1492 | #ifdef CONFIG_PM |
1493 | .pm = &input_dev_pm_ops, | |
1494 | #endif | |
9657d75c DT |
1495 | }; |
1496 | ||
e454cea2 | 1497 | static char *input_devnode(struct device *dev, mode_t *mode) |
aa5ed63e KS |
1498 | { |
1499 | return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev)); | |
1500 | } | |
1501 | ||
ea9f240b | 1502 | struct class input_class = { |
9657d75c | 1503 | .name = "input", |
e454cea2 | 1504 | .devnode = input_devnode, |
d19fbe8a | 1505 | }; |
ca56fe07 | 1506 | EXPORT_SYMBOL_GPL(input_class); |
d19fbe8a | 1507 | |
1447190e DT |
1508 | /** |
1509 | * input_allocate_device - allocate memory for new input device | |
1510 | * | |
1511 | * Returns prepared struct input_dev or NULL. | |
1512 | * | |
1513 | * NOTE: Use input_free_device() to free devices that have not been | |
1514 | * registered; input_unregister_device() should be used for already | |
1515 | * registered devices. | |
1516 | */ | |
d19fbe8a DT |
1517 | struct input_dev *input_allocate_device(void) |
1518 | { | |
1519 | struct input_dev *dev; | |
1520 | ||
1521 | dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); | |
1522 | if (dev) { | |
9657d75c DT |
1523 | dev->dev.type = &input_dev_type; |
1524 | dev->dev.class = &input_class; | |
1525 | device_initialize(&dev->dev); | |
f60d2b11 | 1526 | mutex_init(&dev->mutex); |
8006479c | 1527 | spin_lock_init(&dev->event_lock); |
d19fbe8a DT |
1528 | INIT_LIST_HEAD(&dev->h_list); |
1529 | INIT_LIST_HEAD(&dev->node); | |
655816e4 DT |
1530 | |
1531 | __module_get(THIS_MODULE); | |
d19fbe8a DT |
1532 | } |
1533 | ||
1534 | return dev; | |
1535 | } | |
ca56fe07 | 1536 | EXPORT_SYMBOL(input_allocate_device); |
d19fbe8a | 1537 | |
1447190e DT |
1538 | /** |
1539 | * input_free_device - free memory occupied by input_dev structure | |
1540 | * @dev: input device to free | |
1541 | * | |
1542 | * This function should only be used if input_register_device() | |
1543 | * was not called yet or if it failed. Once device was registered | |
1544 | * use input_unregister_device() and memory will be freed once last | |
8006479c | 1545 | * reference to the device is dropped. |
1447190e DT |
1546 | * |
1547 | * Device should be allocated by input_allocate_device(). | |
1548 | * | |
1549 | * NOTE: If there are references to the input device then memory | |
1550 | * will not be freed until last reference is dropped. | |
1551 | */ | |
f60d2b11 DT |
1552 | void input_free_device(struct input_dev *dev) |
1553 | { | |
54f9e36c | 1554 | if (dev) |
f60d2b11 | 1555 | input_put_device(dev); |
f60d2b11 | 1556 | } |
ca56fe07 | 1557 | EXPORT_SYMBOL(input_free_device); |
f60d2b11 | 1558 | |
40d007e7 HR |
1559 | /** |
1560 | * input_mt_create_slots() - create MT input slots | |
1561 | * @dev: input device supporting MT events and finger tracking | |
1562 | * @num_slots: number of slots used by the device | |
1563 | * | |
1564 | * This function allocates all necessary memory for MT slot handling | |
1565 | * in the input device, and adds ABS_MT_SLOT to the device capabilities. | |
1566 | */ | |
1567 | int input_mt_create_slots(struct input_dev *dev, unsigned int num_slots) | |
1568 | { | |
1569 | if (!num_slots) | |
1570 | return 0; | |
1571 | ||
1572 | dev->mt = kcalloc(num_slots, sizeof(struct input_mt_slot), GFP_KERNEL); | |
1573 | if (!dev->mt) | |
1574 | return -ENOMEM; | |
1575 | ||
1576 | dev->mtsize = num_slots; | |
1577 | input_set_abs_params(dev, ABS_MT_SLOT, 0, num_slots - 1, 0, 0); | |
1578 | ||
1579 | return 0; | |
1580 | } | |
1581 | EXPORT_SYMBOL(input_mt_create_slots); | |
1582 | ||
1583 | /** | |
1584 | * input_mt_destroy_slots() - frees the MT slots of the input device | |
1585 | * @dev: input device with allocated MT slots | |
1586 | * | |
1587 | * This function is only needed in error path as the input core will | |
1588 | * automatically free the MT slots when the device is destroyed. | |
1589 | */ | |
1590 | void input_mt_destroy_slots(struct input_dev *dev) | |
1591 | { | |
1592 | kfree(dev->mt); | |
1593 | dev->mt = NULL; | |
1594 | dev->mtsize = 0; | |
1595 | } | |
1596 | EXPORT_SYMBOL(input_mt_destroy_slots); | |
1597 | ||
534565f2 DT |
1598 | /** |
1599 | * input_set_capability - mark device as capable of a certain event | |
1600 | * @dev: device that is capable of emitting or accepting event | |
1601 | * @type: type of the event (EV_KEY, EV_REL, etc...) | |
1602 | * @code: event code | |
1603 | * | |
1604 | * In addition to setting up corresponding bit in appropriate capability | |
1605 | * bitmap the function also adjusts dev->evbit. | |
1606 | */ | |
1607 | void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code) | |
1608 | { | |
1609 | switch (type) { | |
1610 | case EV_KEY: | |
1611 | __set_bit(code, dev->keybit); | |
1612 | break; | |
1613 | ||
1614 | case EV_REL: | |
1615 | __set_bit(code, dev->relbit); | |
1616 | break; | |
1617 | ||
1618 | case EV_ABS: | |
1619 | __set_bit(code, dev->absbit); | |
1620 | break; | |
1621 | ||
1622 | case EV_MSC: | |
1623 | __set_bit(code, dev->mscbit); | |
1624 | break; | |
1625 | ||
1626 | case EV_SW: | |
1627 | __set_bit(code, dev->swbit); | |
1628 | break; | |
1629 | ||
1630 | case EV_LED: | |
1631 | __set_bit(code, dev->ledbit); | |
1632 | break; | |
1633 | ||
1634 | case EV_SND: | |
1635 | __set_bit(code, dev->sndbit); | |
1636 | break; | |
1637 | ||
1638 | case EV_FF: | |
1639 | __set_bit(code, dev->ffbit); | |
1640 | break; | |
1641 | ||
22d1c398 DES |
1642 | case EV_PWR: |
1643 | /* do nothing */ | |
1644 | break; | |
1645 | ||
534565f2 DT |
1646 | default: |
1647 | printk(KERN_ERR | |
1648 | "input_set_capability: unknown type %u (code %u)\n", | |
1649 | type, code); | |
1650 | dump_stack(); | |
1651 | return; | |
1652 | } | |
1653 | ||
1654 | __set_bit(type, dev->evbit); | |
1655 | } | |
1656 | EXPORT_SYMBOL(input_set_capability); | |
1657 | ||
92a3a587 DT |
1658 | #define INPUT_CLEANSE_BITMASK(dev, type, bits) \ |
1659 | do { \ | |
1660 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1661 | memset(dev->bits##bit, 0, \ | |
1662 | sizeof(dev->bits##bit)); \ | |
1663 | } while (0) | |
1664 | ||
1665 | static void input_cleanse_bitmasks(struct input_dev *dev) | |
1666 | { | |
1667 | INPUT_CLEANSE_BITMASK(dev, KEY, key); | |
1668 | INPUT_CLEANSE_BITMASK(dev, REL, rel); | |
1669 | INPUT_CLEANSE_BITMASK(dev, ABS, abs); | |
1670 | INPUT_CLEANSE_BITMASK(dev, MSC, msc); | |
1671 | INPUT_CLEANSE_BITMASK(dev, LED, led); | |
1672 | INPUT_CLEANSE_BITMASK(dev, SND, snd); | |
1673 | INPUT_CLEANSE_BITMASK(dev, FF, ff); | |
1674 | INPUT_CLEANSE_BITMASK(dev, SW, sw); | |
1675 | } | |
1676 | ||
8006479c DT |
1677 | /** |
1678 | * input_register_device - register device with input core | |
1679 | * @dev: device to be registered | |
1680 | * | |
1681 | * This function registers device with input core. The device must be | |
1682 | * allocated with input_allocate_device() and all it's capabilities | |
1683 | * set up before registering. | |
1684 | * If function fails the device must be freed with input_free_device(). | |
1685 | * Once device has been successfully registered it can be unregistered | |
1686 | * with input_unregister_device(); input_free_device() should not be | |
1687 | * called in this case. | |
1688 | */ | |
5f945489 | 1689 | int input_register_device(struct input_dev *dev) |
1da177e4 | 1690 | { |
bd0ef235 | 1691 | static atomic_t input_no = ATOMIC_INIT(0); |
1da177e4 | 1692 | struct input_handler *handler; |
bd0ef235 DT |
1693 | const char *path; |
1694 | int error; | |
1da177e4 | 1695 | |
4f93df40 | 1696 | /* Every input device generates EV_SYN/SYN_REPORT events. */ |
8006479c | 1697 | __set_bit(EV_SYN, dev->evbit); |
0fbf87ca | 1698 | |
4f93df40 DT |
1699 | /* KEY_RESERVED is not supposed to be transmitted to userspace. */ |
1700 | __clear_bit(KEY_RESERVED, dev->keybit); | |
1701 | ||
92a3a587 DT |
1702 | /* Make sure that bitmasks not mentioned in dev->evbit are clean. */ |
1703 | input_cleanse_bitmasks(dev); | |
1704 | ||
1da177e4 LT |
1705 | /* |
1706 | * If delay and period are pre-set by the driver, then autorepeating | |
1707 | * is handled by the driver itself and we don't do it in input.c. | |
1708 | */ | |
1da177e4 LT |
1709 | init_timer(&dev->timer); |
1710 | if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { | |
1711 | dev->timer.data = (long) dev; | |
1712 | dev->timer.function = input_repeat_key; | |
1713 | dev->rep[REP_DELAY] = 250; | |
1714 | dev->rep[REP_PERIOD] = 33; | |
1715 | } | |
1716 | ||
c8e4c772 MR |
1717 | if (!dev->getkeycode) |
1718 | dev->getkeycode = input_default_getkeycode; | |
1719 | ||
1720 | if (!dev->setkeycode) | |
1721 | dev->setkeycode = input_default_setkeycode; | |
1722 | ||
a6c2490f KS |
1723 | dev_set_name(&dev->dev, "input%ld", |
1724 | (unsigned long) atomic_inc_return(&input_no) - 1); | |
bd0ef235 | 1725 | |
9657d75c | 1726 | error = device_add(&dev->dev); |
bd0ef235 DT |
1727 | if (error) |
1728 | return error; | |
1729 | ||
9657d75c | 1730 | path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
bd0ef235 DT |
1731 | printk(KERN_INFO "input: %s as %s\n", |
1732 | dev->name ? dev->name : "Unspecified device", path ? path : "N/A"); | |
1733 | kfree(path); | |
10204020 | 1734 | |
8006479c DT |
1735 | error = mutex_lock_interruptible(&input_mutex); |
1736 | if (error) { | |
1737 | device_del(&dev->dev); | |
1738 | return error; | |
1739 | } | |
1740 | ||
1741 | list_add_tail(&dev->node, &input_dev_list); | |
1742 | ||
1da177e4 | 1743 | list_for_each_entry(handler, &input_handler_list, node) |
5b2a0826 | 1744 | input_attach_handler(dev, handler); |
1da177e4 | 1745 | |
f96b434d | 1746 | input_wakeup_procfs_readers(); |
5f945489 | 1747 | |
8006479c DT |
1748 | mutex_unlock(&input_mutex); |
1749 | ||
5f945489 | 1750 | return 0; |
1da177e4 | 1751 | } |
ca56fe07 | 1752 | EXPORT_SYMBOL(input_register_device); |
1da177e4 | 1753 | |
8006479c DT |
1754 | /** |
1755 | * input_unregister_device - unregister previously registered device | |
1756 | * @dev: device to be unregistered | |
1757 | * | |
1758 | * This function unregisters an input device. Once device is unregistered | |
1759 | * the caller should not try to access it as it may get freed at any moment. | |
1760 | */ | |
1da177e4 LT |
1761 | void input_unregister_device(struct input_dev *dev) |
1762 | { | |
5b2a0826 | 1763 | struct input_handle *handle, *next; |
1da177e4 | 1764 | |
8006479c | 1765 | input_disconnect_device(dev); |
1da177e4 | 1766 | |
8006479c | 1767 | mutex_lock(&input_mutex); |
1da177e4 | 1768 | |
5b2a0826 | 1769 | list_for_each_entry_safe(handle, next, &dev->h_list, d_node) |
1da177e4 | 1770 | handle->handler->disconnect(handle); |
5b2a0826 | 1771 | WARN_ON(!list_empty(&dev->h_list)); |
1da177e4 | 1772 | |
8006479c | 1773 | del_timer_sync(&dev->timer); |
1da177e4 LT |
1774 | list_del_init(&dev->node); |
1775 | ||
f96b434d | 1776 | input_wakeup_procfs_readers(); |
8006479c DT |
1777 | |
1778 | mutex_unlock(&input_mutex); | |
1779 | ||
1780 | device_unregister(&dev->dev); | |
1da177e4 | 1781 | } |
ca56fe07 | 1782 | EXPORT_SYMBOL(input_unregister_device); |
1da177e4 | 1783 | |
8006479c DT |
1784 | /** |
1785 | * input_register_handler - register a new input handler | |
1786 | * @handler: handler to be registered | |
1787 | * | |
1788 | * This function registers a new input handler (interface) for input | |
1789 | * devices in the system and attaches it to all input devices that | |
1790 | * are compatible with the handler. | |
1791 | */ | |
4263cf0f | 1792 | int input_register_handler(struct input_handler *handler) |
1da177e4 LT |
1793 | { |
1794 | struct input_dev *dev; | |
8006479c DT |
1795 | int retval; |
1796 | ||
1797 | retval = mutex_lock_interruptible(&input_mutex); | |
1798 | if (retval) | |
1799 | return retval; | |
1da177e4 | 1800 | |
1da177e4 LT |
1801 | INIT_LIST_HEAD(&handler->h_list); |
1802 | ||
4263cf0f | 1803 | if (handler->fops != NULL) { |
8006479c DT |
1804 | if (input_table[handler->minor >> 5]) { |
1805 | retval = -EBUSY; | |
1806 | goto out; | |
1807 | } | |
1da177e4 | 1808 | input_table[handler->minor >> 5] = handler; |
4263cf0f | 1809 | } |
1da177e4 LT |
1810 | |
1811 | list_add_tail(&handler->node, &input_handler_list); | |
1812 | ||
1813 | list_for_each_entry(dev, &input_dev_list, node) | |
5b2a0826 | 1814 | input_attach_handler(dev, handler); |
1da177e4 | 1815 | |
f96b434d | 1816 | input_wakeup_procfs_readers(); |
8006479c DT |
1817 | |
1818 | out: | |
1819 | mutex_unlock(&input_mutex); | |
1820 | return retval; | |
1da177e4 | 1821 | } |
ca56fe07 | 1822 | EXPORT_SYMBOL(input_register_handler); |
1da177e4 | 1823 | |
8006479c DT |
1824 | /** |
1825 | * input_unregister_handler - unregisters an input handler | |
1826 | * @handler: handler to be unregistered | |
1827 | * | |
1828 | * This function disconnects a handler from its input devices and | |
1829 | * removes it from lists of known handlers. | |
1830 | */ | |
1da177e4 LT |
1831 | void input_unregister_handler(struct input_handler *handler) |
1832 | { | |
5b2a0826 | 1833 | struct input_handle *handle, *next; |
1da177e4 | 1834 | |
8006479c DT |
1835 | mutex_lock(&input_mutex); |
1836 | ||
5b2a0826 | 1837 | list_for_each_entry_safe(handle, next, &handler->h_list, h_node) |
1da177e4 | 1838 | handler->disconnect(handle); |
5b2a0826 | 1839 | WARN_ON(!list_empty(&handler->h_list)); |
1da177e4 LT |
1840 | |
1841 | list_del_init(&handler->node); | |
1842 | ||
1843 | if (handler->fops != NULL) | |
1844 | input_table[handler->minor >> 5] = NULL; | |
1845 | ||
f96b434d | 1846 | input_wakeup_procfs_readers(); |
8006479c DT |
1847 | |
1848 | mutex_unlock(&input_mutex); | |
1da177e4 | 1849 | } |
ca56fe07 | 1850 | EXPORT_SYMBOL(input_unregister_handler); |
1da177e4 | 1851 | |
66d2a595 DT |
1852 | /** |
1853 | * input_handler_for_each_handle - handle iterator | |
1854 | * @handler: input handler to iterate | |
1855 | * @data: data for the callback | |
1856 | * @fn: function to be called for each handle | |
1857 | * | |
1858 | * Iterate over @bus's list of devices, and call @fn for each, passing | |
1859 | * it @data and stop when @fn returns a non-zero value. The function is | |
1860 | * using RCU to traverse the list and therefore may be usind in atonic | |
1861 | * contexts. The @fn callback is invoked from RCU critical section and | |
1862 | * thus must not sleep. | |
1863 | */ | |
1864 | int input_handler_for_each_handle(struct input_handler *handler, void *data, | |
1865 | int (*fn)(struct input_handle *, void *)) | |
1866 | { | |
1867 | struct input_handle *handle; | |
1868 | int retval = 0; | |
1869 | ||
1870 | rcu_read_lock(); | |
1871 | ||
1872 | list_for_each_entry_rcu(handle, &handler->h_list, h_node) { | |
1873 | retval = fn(handle, data); | |
1874 | if (retval) | |
1875 | break; | |
1876 | } | |
1877 | ||
1878 | rcu_read_unlock(); | |
1879 | ||
1880 | return retval; | |
1881 | } | |
1882 | EXPORT_SYMBOL(input_handler_for_each_handle); | |
1883 | ||
8006479c DT |
1884 | /** |
1885 | * input_register_handle - register a new input handle | |
1886 | * @handle: handle to register | |
1887 | * | |
1888 | * This function puts a new input handle onto device's | |
1889 | * and handler's lists so that events can flow through | |
1890 | * it once it is opened using input_open_device(). | |
1891 | * | |
1892 | * This function is supposed to be called from handler's | |
1893 | * connect() method. | |
1894 | */ | |
5b2a0826 DT |
1895 | int input_register_handle(struct input_handle *handle) |
1896 | { | |
1897 | struct input_handler *handler = handle->handler; | |
8006479c DT |
1898 | struct input_dev *dev = handle->dev; |
1899 | int error; | |
1900 | ||
1901 | /* | |
1902 | * We take dev->mutex here to prevent race with | |
1903 | * input_release_device(). | |
1904 | */ | |
1905 | error = mutex_lock_interruptible(&dev->mutex); | |
1906 | if (error) | |
1907 | return error; | |
ef7995f4 DT |
1908 | |
1909 | /* | |
1910 | * Filters go to the head of the list, normal handlers | |
1911 | * to the tail. | |
1912 | */ | |
1913 | if (handler->filter) | |
1914 | list_add_rcu(&handle->d_node, &dev->h_list); | |
1915 | else | |
1916 | list_add_tail_rcu(&handle->d_node, &dev->h_list); | |
1917 | ||
8006479c | 1918 | mutex_unlock(&dev->mutex); |
5b2a0826 | 1919 | |
8006479c DT |
1920 | /* |
1921 | * Since we are supposed to be called from ->connect() | |
1922 | * which is mutually exclusive with ->disconnect() | |
1923 | * we can't be racing with input_unregister_handle() | |
1924 | * and so separate lock is not needed here. | |
1925 | */ | |
66d2a595 | 1926 | list_add_tail_rcu(&handle->h_node, &handler->h_list); |
5b2a0826 DT |
1927 | |
1928 | if (handler->start) | |
1929 | handler->start(handle); | |
1930 | ||
1931 | return 0; | |
1932 | } | |
1933 | EXPORT_SYMBOL(input_register_handle); | |
1934 | ||
8006479c DT |
1935 | /** |
1936 | * input_unregister_handle - unregister an input handle | |
1937 | * @handle: handle to unregister | |
1938 | * | |
1939 | * This function removes input handle from device's | |
1940 | * and handler's lists. | |
1941 | * | |
1942 | * This function is supposed to be called from handler's | |
1943 | * disconnect() method. | |
1944 | */ | |
5b2a0826 DT |
1945 | void input_unregister_handle(struct input_handle *handle) |
1946 | { | |
8006479c DT |
1947 | struct input_dev *dev = handle->dev; |
1948 | ||
66d2a595 | 1949 | list_del_rcu(&handle->h_node); |
8006479c DT |
1950 | |
1951 | /* | |
1952 | * Take dev->mutex to prevent race with input_release_device(). | |
1953 | */ | |
1954 | mutex_lock(&dev->mutex); | |
1955 | list_del_rcu(&handle->d_node); | |
1956 | mutex_unlock(&dev->mutex); | |
66d2a595 | 1957 | |
82ba56c2 | 1958 | synchronize_rcu(); |
5b2a0826 DT |
1959 | } |
1960 | EXPORT_SYMBOL(input_unregister_handle); | |
1961 | ||
1da177e4 LT |
1962 | static int input_open_file(struct inode *inode, struct file *file) |
1963 | { | |
2edbf853 | 1964 | struct input_handler *handler; |
99ac48f5 | 1965 | const struct file_operations *old_fops, *new_fops = NULL; |
1da177e4 LT |
1966 | int err; |
1967 | ||
2f2177c8 AB |
1968 | err = mutex_lock_interruptible(&input_mutex); |
1969 | if (err) | |
1970 | return err; | |
1971 | ||
1da177e4 | 1972 | /* No load-on-demand here? */ |
2edbf853 | 1973 | handler = input_table[iminor(inode) >> 5]; |
2f2177c8 AB |
1974 | if (handler) |
1975 | new_fops = fops_get(handler->fops); | |
1976 | ||
1977 | mutex_unlock(&input_mutex); | |
1da177e4 LT |
1978 | |
1979 | /* | |
1980 | * That's _really_ odd. Usually NULL ->open means "nothing special", | |
1981 | * not "no device". Oh, well... | |
1982 | */ | |
2f2177c8 | 1983 | if (!new_fops || !new_fops->open) { |
1da177e4 | 1984 | fops_put(new_fops); |
2edbf853 JC |
1985 | err = -ENODEV; |
1986 | goto out; | |
1da177e4 | 1987 | } |
2f2177c8 | 1988 | |
1da177e4 LT |
1989 | old_fops = file->f_op; |
1990 | file->f_op = new_fops; | |
1991 | ||
1992 | err = new_fops->open(inode, file); | |
1da177e4 LT |
1993 | if (err) { |
1994 | fops_put(file->f_op); | |
1995 | file->f_op = fops_get(old_fops); | |
1996 | } | |
1997 | fops_put(old_fops); | |
2edbf853 | 1998 | out: |
1da177e4 LT |
1999 | return err; |
2000 | } | |
2001 | ||
2b8693c0 | 2002 | static const struct file_operations input_fops = { |
1da177e4 LT |
2003 | .owner = THIS_MODULE, |
2004 | .open = input_open_file, | |
2005 | }; | |
2006 | ||
f96b434d | 2007 | static int __init input_init(void) |
1da177e4 | 2008 | { |
f96b434d | 2009 | int err; |
1da177e4 | 2010 | |
ea9f240b | 2011 | err = class_register(&input_class); |
d19fbe8a DT |
2012 | if (err) { |
2013 | printk(KERN_ERR "input: unable to register input_dev class\n"); | |
2014 | return err; | |
2015 | } | |
2016 | ||
f96b434d DT |
2017 | err = input_proc_init(); |
2018 | if (err) | |
b0fdfebb | 2019 | goto fail1; |
1da177e4 | 2020 | |
f96b434d DT |
2021 | err = register_chrdev(INPUT_MAJOR, "input", &input_fops); |
2022 | if (err) { | |
2023 | printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR); | |
b0fdfebb | 2024 | goto fail2; |
1da177e4 | 2025 | } |
e334016f | 2026 | |
1da177e4 | 2027 | return 0; |
1da177e4 | 2028 | |
b0fdfebb | 2029 | fail2: input_proc_exit(); |
ea9f240b | 2030 | fail1: class_unregister(&input_class); |
f96b434d | 2031 | return err; |
1da177e4 LT |
2032 | } |
2033 | ||
2034 | static void __exit input_exit(void) | |
2035 | { | |
f96b434d | 2036 | input_proc_exit(); |
1da177e4 | 2037 | unregister_chrdev(INPUT_MAJOR, "input"); |
ea9f240b | 2038 | class_unregister(&input_class); |
1da177e4 LT |
2039 | } |
2040 | ||
2041 | subsys_initcall(input_init); | |
2042 | module_exit(input_exit); |