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