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