Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * The input core | |
3 | * | |
4 | * Copyright (c) 1999-2002 Vojtech Pavlik | |
5 | */ | |
6 | ||
7 | /* | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License version 2 as published by | |
10 | * the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/init.h> | |
ffd0db97 | 14 | #include <linux/types.h> |
1da177e4 LT |
15 | #include <linux/input.h> |
16 | #include <linux/module.h> | |
17 | #include <linux/random.h> | |
18 | #include <linux/major.h> | |
19 | #include <linux/proc_fs.h> | |
a99bbaf5 | 20 | #include <linux/sched.h> |
969b21cd | 21 | #include <linux/seq_file.h> |
1da177e4 LT |
22 | #include <linux/poll.h> |
23 | #include <linux/device.h> | |
e676c232 | 24 | #include <linux/mutex.h> |
8006479c | 25 | #include <linux/rcupdate.h> |
2edbf853 | 26 | #include <linux/smp_lock.h> |
15e184af | 27 | #include "input-compat.h" |
1da177e4 LT |
28 | |
29 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>"); | |
30 | MODULE_DESCRIPTION("Input core"); | |
31 | MODULE_LICENSE("GPL"); | |
32 | ||
1da177e4 LT |
33 | #define INPUT_DEVICES 256 |
34 | ||
61994a61 HR |
35 | /* |
36 | * EV_ABS events which should not be cached are listed here. | |
37 | */ | |
38 | static unsigned int input_abs_bypass_init_data[] __initdata = { | |
5e5ee686 HR |
39 | ABS_MT_TOUCH_MAJOR, |
40 | ABS_MT_TOUCH_MINOR, | |
41 | ABS_MT_WIDTH_MAJOR, | |
42 | ABS_MT_WIDTH_MINOR, | |
43 | ABS_MT_ORIENTATION, | |
44 | ABS_MT_POSITION_X, | |
45 | ABS_MT_POSITION_Y, | |
46 | ABS_MT_TOOL_TYPE, | |
47 | ABS_MT_BLOB_ID, | |
df391e0e | 48 | ABS_MT_TRACKING_ID, |
cb6ecf6f | 49 | ABS_MT_PRESSURE, |
61994a61 HR |
50 | 0 |
51 | }; | |
52 | static unsigned long input_abs_bypass[BITS_TO_LONGS(ABS_CNT)]; | |
53 | ||
1da177e4 LT |
54 | static LIST_HEAD(input_dev_list); |
55 | static LIST_HEAD(input_handler_list); | |
56 | ||
8006479c DT |
57 | /* |
58 | * input_mutex protects access to both input_dev_list and input_handler_list. | |
59 | * This also causes input_[un]register_device and input_[un]register_handler | |
60 | * be mutually exclusive which simplifies locking in drivers implementing | |
61 | * input handlers. | |
62 | */ | |
63 | static DEFINE_MUTEX(input_mutex); | |
64 | ||
1da177e4 LT |
65 | static struct input_handler *input_table[8]; |
66 | ||
8006479c DT |
67 | static inline int is_event_supported(unsigned int code, |
68 | unsigned long *bm, unsigned int max) | |
1da177e4 | 69 | { |
8006479c DT |
70 | return code <= max && test_bit(code, bm); |
71 | } | |
1da177e4 | 72 | |
8006479c DT |
73 | static int input_defuzz_abs_event(int value, int old_val, int fuzz) |
74 | { | |
75 | if (fuzz) { | |
76 | if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2) | |
77 | return old_val; | |
1da177e4 | 78 | |
8006479c DT |
79 | if (value > old_val - fuzz && value < old_val + fuzz) |
80 | return (old_val * 3 + value) / 4; | |
1da177e4 | 81 | |
8006479c DT |
82 | if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2) |
83 | return (old_val + value) / 2; | |
84 | } | |
1da177e4 | 85 | |
8006479c DT |
86 | return value; |
87 | } | |
1da177e4 | 88 | |
8006479c | 89 | /* |
ef7995f4 DT |
90 | * Pass event first through all filters and then, if event has not been |
91 | * filtered out, through all open handles. This function is called with | |
82ba56c2 | 92 | * dev->event_lock held and interrupts disabled. |
8006479c DT |
93 | */ |
94 | static void input_pass_event(struct input_dev *dev, | |
95 | unsigned int type, unsigned int code, int value) | |
96 | { | |
ef7995f4 | 97 | struct input_handler *handler; |
82ba56c2 DT |
98 | struct input_handle *handle; |
99 | ||
100 | rcu_read_lock(); | |
1da177e4 | 101 | |
82ba56c2 | 102 | handle = rcu_dereference(dev->grab); |
8006479c DT |
103 | if (handle) |
104 | handle->handler->event(handle, type, code, value); | |
ef7995f4 DT |
105 | else { |
106 | bool filtered = false; | |
107 | ||
108 | list_for_each_entry_rcu(handle, &dev->h_list, d_node) { | |
109 | if (!handle->open) | |
110 | continue; | |
111 | ||
112 | handler = handle->handler; | |
113 | if (!handler->filter) { | |
114 | if (filtered) | |
115 | break; | |
116 | ||
117 | handler->event(handle, type, code, value); | |
118 | ||
119 | } else if (handler->filter(handle, type, code, value)) | |
120 | filtered = true; | |
121 | } | |
122 | } | |
123 | ||
82ba56c2 | 124 | rcu_read_unlock(); |
8006479c | 125 | } |
1da177e4 | 126 | |
8006479c DT |
127 | /* |
128 | * Generate software autorepeat event. Note that we take | |
129 | * dev->event_lock here to avoid racing with input_event | |
130 | * which may cause keys get "stuck". | |
131 | */ | |
132 | static void input_repeat_key(unsigned long data) | |
133 | { | |
134 | struct input_dev *dev = (void *) data; | |
135 | unsigned long flags; | |
1da177e4 | 136 | |
8006479c | 137 | spin_lock_irqsave(&dev->event_lock, flags); |
1da177e4 | 138 | |
8006479c DT |
139 | if (test_bit(dev->repeat_key, dev->key) && |
140 | is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) { | |
1da177e4 | 141 | |
8006479c | 142 | input_pass_event(dev, EV_KEY, dev->repeat_key, 2); |
1da177e4 | 143 | |
8006479c DT |
144 | if (dev->sync) { |
145 | /* | |
146 | * Only send SYN_REPORT if we are not in a middle | |
147 | * of driver parsing a new hardware packet. | |
148 | * Otherwise assume that the driver will send | |
149 | * SYN_REPORT once it's done. | |
150 | */ | |
151 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
152 | } | |
31581066 | 153 | |
8006479c DT |
154 | if (dev->rep[REP_PERIOD]) |
155 | mod_timer(&dev->timer, jiffies + | |
156 | msecs_to_jiffies(dev->rep[REP_PERIOD])); | |
157 | } | |
31581066 | 158 | |
8006479c DT |
159 | spin_unlock_irqrestore(&dev->event_lock, flags); |
160 | } | |
31581066 | 161 | |
8006479c DT |
162 | static void input_start_autorepeat(struct input_dev *dev, int code) |
163 | { | |
164 | if (test_bit(EV_REP, dev->evbit) && | |
165 | dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && | |
166 | dev->timer.data) { | |
167 | dev->repeat_key = code; | |
168 | mod_timer(&dev->timer, | |
169 | jiffies + msecs_to_jiffies(dev->rep[REP_DELAY])); | |
170 | } | |
171 | } | |
31581066 | 172 | |
e7b5c1ef JB |
173 | static void input_stop_autorepeat(struct input_dev *dev) |
174 | { | |
175 | del_timer(&dev->timer); | |
176 | } | |
177 | ||
8006479c DT |
178 | #define INPUT_IGNORE_EVENT 0 |
179 | #define INPUT_PASS_TO_HANDLERS 1 | |
180 | #define INPUT_PASS_TO_DEVICE 2 | |
181 | #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE) | |
1da177e4 | 182 | |
8006479c DT |
183 | static void input_handle_event(struct input_dev *dev, |
184 | unsigned int type, unsigned int code, int value) | |
185 | { | |
186 | int disposition = INPUT_IGNORE_EVENT; | |
1da177e4 | 187 | |
8006479c | 188 | switch (type) { |
1da177e4 | 189 | |
8006479c DT |
190 | case EV_SYN: |
191 | switch (code) { | |
192 | case SYN_CONFIG: | |
193 | disposition = INPUT_PASS_TO_ALL; | |
194 | break; | |
1da177e4 | 195 | |
8006479c DT |
196 | case SYN_REPORT: |
197 | if (!dev->sync) { | |
198 | dev->sync = 1; | |
199 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 200 | } |
1da177e4 | 201 | break; |
5e5ee686 HR |
202 | case SYN_MT_REPORT: |
203 | dev->sync = 0; | |
204 | disposition = INPUT_PASS_TO_HANDLERS; | |
205 | break; | |
8006479c DT |
206 | } |
207 | break; | |
1da177e4 | 208 | |
8006479c DT |
209 | case EV_KEY: |
210 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
211 | !!test_bit(code, dev->key) != value) { | |
1da177e4 | 212 | |
8006479c DT |
213 | if (value != 2) { |
214 | __change_bit(code, dev->key); | |
215 | if (value) | |
216 | input_start_autorepeat(dev, code); | |
e7b5c1ef JB |
217 | else |
218 | input_stop_autorepeat(dev); | |
8006479c | 219 | } |
1da177e4 | 220 | |
8006479c DT |
221 | disposition = INPUT_PASS_TO_HANDLERS; |
222 | } | |
223 | break; | |
1da177e4 | 224 | |
8006479c DT |
225 | case EV_SW: |
226 | if (is_event_supported(code, dev->swbit, SW_MAX) && | |
227 | !!test_bit(code, dev->sw) != value) { | |
1da177e4 | 228 | |
8006479c DT |
229 | __change_bit(code, dev->sw); |
230 | disposition = INPUT_PASS_TO_HANDLERS; | |
231 | } | |
232 | break; | |
1da177e4 | 233 | |
8006479c DT |
234 | case EV_ABS: |
235 | if (is_event_supported(code, dev->absbit, ABS_MAX)) { | |
1da177e4 | 236 | |
61994a61 HR |
237 | if (test_bit(code, input_abs_bypass)) { |
238 | disposition = INPUT_PASS_TO_HANDLERS; | |
239 | break; | |
240 | } | |
241 | ||
8006479c DT |
242 | value = input_defuzz_abs_event(value, |
243 | dev->abs[code], dev->absfuzz[code]); | |
1da177e4 | 244 | |
8006479c DT |
245 | if (dev->abs[code] != value) { |
246 | dev->abs[code] = value; | |
247 | disposition = INPUT_PASS_TO_HANDLERS; | |
248 | } | |
249 | } | |
250 | break; | |
1da177e4 | 251 | |
8006479c DT |
252 | case EV_REL: |
253 | if (is_event_supported(code, dev->relbit, REL_MAX) && value) | |
254 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 255 | |
8006479c | 256 | break; |
1e0afb28 | 257 | |
8006479c DT |
258 | case EV_MSC: |
259 | if (is_event_supported(code, dev->mscbit, MSC_MAX)) | |
260 | disposition = INPUT_PASS_TO_ALL; | |
1da177e4 | 261 | |
8006479c | 262 | break; |
1da177e4 | 263 | |
8006479c DT |
264 | case EV_LED: |
265 | if (is_event_supported(code, dev->ledbit, LED_MAX) && | |
266 | !!test_bit(code, dev->led) != value) { | |
1da177e4 | 267 | |
8006479c DT |
268 | __change_bit(code, dev->led); |
269 | disposition = INPUT_PASS_TO_ALL; | |
270 | } | |
271 | break; | |
272 | ||
273 | case EV_SND: | |
274 | if (is_event_supported(code, dev->sndbit, SND_MAX)) { | |
1da177e4 | 275 | |
8fdc1948 | 276 | if (!!test_bit(code, dev->snd) != !!value) |
8006479c DT |
277 | __change_bit(code, dev->snd); |
278 | disposition = INPUT_PASS_TO_ALL; | |
279 | } | |
280 | break; | |
8fdc1948 | 281 | |
8006479c DT |
282 | case EV_REP: |
283 | if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) { | |
284 | dev->rep[code] = value; | |
285 | disposition = INPUT_PASS_TO_ALL; | |
286 | } | |
287 | break; | |
1da177e4 | 288 | |
8006479c DT |
289 | case EV_FF: |
290 | if (value >= 0) | |
291 | disposition = INPUT_PASS_TO_ALL; | |
292 | break; | |
ed2fa4dd RP |
293 | |
294 | case EV_PWR: | |
295 | disposition = INPUT_PASS_TO_ALL; | |
296 | break; | |
8006479c | 297 | } |
1da177e4 | 298 | |
c9812282 | 299 | if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN) |
8006479c | 300 | dev->sync = 0; |
1da177e4 | 301 | |
8006479c DT |
302 | if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event) |
303 | dev->event(dev, type, code, value); | |
1da177e4 | 304 | |
8006479c DT |
305 | if (disposition & INPUT_PASS_TO_HANDLERS) |
306 | input_pass_event(dev, type, code, value); | |
307 | } | |
1da177e4 | 308 | |
8006479c DT |
309 | /** |
310 | * input_event() - report new input event | |
311 | * @dev: device that generated the event | |
312 | * @type: type of the event | |
313 | * @code: event code | |
314 | * @value: value of the event | |
315 | * | |
316 | * This function should be used by drivers implementing various input | |
df2d4637 DT |
317 | * devices to report input events. See also input_inject_event(). |
318 | * | |
319 | * NOTE: input_event() may be safely used right after input device was | |
320 | * allocated with input_allocate_device(), even before it is registered | |
321 | * with input_register_device(), but the event will not reach any of the | |
322 | * input handlers. Such early invocation of input_event() may be used | |
323 | * to 'seed' initial state of a switch or initial position of absolute | |
324 | * axis, etc. | |
8006479c | 325 | */ |
8006479c DT |
326 | void input_event(struct input_dev *dev, |
327 | unsigned int type, unsigned int code, int value) | |
328 | { | |
329 | unsigned long flags; | |
509ca1a9 | 330 | |
8006479c | 331 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
509ca1a9 | 332 | |
8006479c DT |
333 | spin_lock_irqsave(&dev->event_lock, flags); |
334 | add_input_randomness(type, code, value); | |
335 | input_handle_event(dev, type, code, value); | |
336 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1da177e4 | 337 | } |
1da177e4 | 338 | } |
ca56fe07 | 339 | EXPORT_SYMBOL(input_event); |
1da177e4 | 340 | |
0e739d28 DT |
341 | /** |
342 | * input_inject_event() - send input event from input handler | |
343 | * @handle: input handle to send event through | |
344 | * @type: type of the event | |
345 | * @code: event code | |
346 | * @value: value of the event | |
347 | * | |
8006479c DT |
348 | * Similar to input_event() but will ignore event if device is |
349 | * "grabbed" and handle injecting event is not the one that owns | |
350 | * the device. | |
0e739d28 | 351 | */ |
8006479c DT |
352 | void input_inject_event(struct input_handle *handle, |
353 | unsigned int type, unsigned int code, int value) | |
1da177e4 | 354 | { |
8006479c DT |
355 | struct input_dev *dev = handle->dev; |
356 | struct input_handle *grab; | |
357 | unsigned long flags; | |
1da177e4 | 358 | |
8006479c DT |
359 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
360 | spin_lock_irqsave(&dev->event_lock, flags); | |
1da177e4 | 361 | |
82ba56c2 | 362 | rcu_read_lock(); |
8006479c DT |
363 | grab = rcu_dereference(dev->grab); |
364 | if (!grab || grab == handle) | |
365 | input_handle_event(dev, type, code, value); | |
82ba56c2 | 366 | rcu_read_unlock(); |
1da177e4 | 367 | |
8006479c DT |
368 | spin_unlock_irqrestore(&dev->event_lock, flags); |
369 | } | |
1da177e4 | 370 | } |
8006479c | 371 | EXPORT_SYMBOL(input_inject_event); |
1da177e4 | 372 | |
8006479c DT |
373 | /** |
374 | * input_grab_device - grabs device for exclusive use | |
375 | * @handle: input handle that wants to own the device | |
376 | * | |
377 | * When a device is grabbed by an input handle all events generated by | |
378 | * the device are delivered only to this handle. Also events injected | |
379 | * by other input handles are ignored while device is grabbed. | |
380 | */ | |
1da177e4 LT |
381 | int input_grab_device(struct input_handle *handle) |
382 | { | |
8006479c DT |
383 | struct input_dev *dev = handle->dev; |
384 | int retval; | |
1da177e4 | 385 | |
8006479c DT |
386 | retval = mutex_lock_interruptible(&dev->mutex); |
387 | if (retval) | |
388 | return retval; | |
389 | ||
390 | if (dev->grab) { | |
391 | retval = -EBUSY; | |
392 | goto out; | |
393 | } | |
394 | ||
395 | rcu_assign_pointer(dev->grab, handle); | |
82ba56c2 | 396 | synchronize_rcu(); |
8006479c DT |
397 | |
398 | out: | |
399 | mutex_unlock(&dev->mutex); | |
400 | return retval; | |
1da177e4 | 401 | } |
ca56fe07 | 402 | EXPORT_SYMBOL(input_grab_device); |
1da177e4 | 403 | |
8006479c | 404 | static void __input_release_device(struct input_handle *handle) |
1da177e4 | 405 | { |
a2b2ed2c | 406 | struct input_dev *dev = handle->dev; |
c7e8dc6e | 407 | |
a2b2ed2c | 408 | if (dev->grab == handle) { |
8006479c DT |
409 | rcu_assign_pointer(dev->grab, NULL); |
410 | /* Make sure input_pass_event() notices that grab is gone */ | |
82ba56c2 | 411 | synchronize_rcu(); |
a2b2ed2c AM |
412 | |
413 | list_for_each_entry(handle, &dev->h_list, d_node) | |
8006479c | 414 | if (handle->open && handle->handler->start) |
c7e8dc6e DT |
415 | handle->handler->start(handle); |
416 | } | |
1da177e4 | 417 | } |
8006479c DT |
418 | |
419 | /** | |
420 | * input_release_device - release previously grabbed device | |
421 | * @handle: input handle that owns the device | |
422 | * | |
423 | * Releases previously grabbed device so that other input handles can | |
424 | * start receiving input events. Upon release all handlers attached | |
425 | * to the device have their start() method called so they have a change | |
426 | * to synchronize device state with the rest of the system. | |
427 | */ | |
428 | void input_release_device(struct input_handle *handle) | |
429 | { | |
430 | struct input_dev *dev = handle->dev; | |
431 | ||
432 | mutex_lock(&dev->mutex); | |
433 | __input_release_device(handle); | |
434 | mutex_unlock(&dev->mutex); | |
435 | } | |
ca56fe07 | 436 | EXPORT_SYMBOL(input_release_device); |
1da177e4 | 437 | |
8006479c DT |
438 | /** |
439 | * input_open_device - open input device | |
440 | * @handle: handle through which device is being accessed | |
441 | * | |
442 | * This function should be called by input handlers when they | |
443 | * want to start receive events from given input device. | |
444 | */ | |
1da177e4 LT |
445 | int input_open_device(struct input_handle *handle) |
446 | { | |
0fbf87ca | 447 | struct input_dev *dev = handle->dev; |
8006479c | 448 | int retval; |
0fbf87ca | 449 | |
8006479c DT |
450 | retval = mutex_lock_interruptible(&dev->mutex); |
451 | if (retval) | |
452 | return retval; | |
453 | ||
454 | if (dev->going_away) { | |
455 | retval = -ENODEV; | |
456 | goto out; | |
457 | } | |
0fbf87ca | 458 | |
1da177e4 | 459 | handle->open++; |
0fbf87ca DT |
460 | |
461 | if (!dev->users++ && dev->open) | |
8006479c DT |
462 | retval = dev->open(dev); |
463 | ||
464 | if (retval) { | |
465 | dev->users--; | |
466 | if (!--handle->open) { | |
467 | /* | |
468 | * Make sure we are not delivering any more events | |
469 | * through this handle | |
470 | */ | |
82ba56c2 | 471 | synchronize_rcu(); |
8006479c DT |
472 | } |
473 | } | |
0fbf87ca | 474 | |
8006479c | 475 | out: |
e676c232 | 476 | mutex_unlock(&dev->mutex); |
8006479c | 477 | return retval; |
1da177e4 | 478 | } |
ca56fe07 | 479 | EXPORT_SYMBOL(input_open_device); |
1da177e4 | 480 | |
8006479c | 481 | int input_flush_device(struct input_handle *handle, struct file *file) |
1da177e4 | 482 | { |
8006479c DT |
483 | struct input_dev *dev = handle->dev; |
484 | int retval; | |
1da177e4 | 485 | |
8006479c DT |
486 | retval = mutex_lock_interruptible(&dev->mutex); |
487 | if (retval) | |
488 | return retval; | |
489 | ||
490 | if (dev->flush) | |
491 | retval = dev->flush(dev, file); | |
492 | ||
493 | mutex_unlock(&dev->mutex); | |
494 | return retval; | |
1da177e4 | 495 | } |
ca56fe07 | 496 | EXPORT_SYMBOL(input_flush_device); |
1da177e4 | 497 | |
8006479c DT |
498 | /** |
499 | * input_close_device - close input device | |
500 | * @handle: handle through which device is being accessed | |
501 | * | |
502 | * This function should be called by input handlers when they | |
503 | * want to stop receive events from given input device. | |
504 | */ | |
1da177e4 LT |
505 | void input_close_device(struct input_handle *handle) |
506 | { | |
0fbf87ca DT |
507 | struct input_dev *dev = handle->dev; |
508 | ||
e676c232 | 509 | mutex_lock(&dev->mutex); |
0fbf87ca | 510 | |
8006479c DT |
511 | __input_release_device(handle); |
512 | ||
0fbf87ca DT |
513 | if (!--dev->users && dev->close) |
514 | dev->close(dev); | |
8006479c DT |
515 | |
516 | if (!--handle->open) { | |
517 | /* | |
82ba56c2 | 518 | * synchronize_rcu() makes sure that input_pass_event() |
8006479c DT |
519 | * completed and that no more input events are delivered |
520 | * through this handle | |
521 | */ | |
82ba56c2 | 522 | synchronize_rcu(); |
8006479c | 523 | } |
0fbf87ca | 524 | |
e676c232 | 525 | mutex_unlock(&dev->mutex); |
1da177e4 | 526 | } |
ca56fe07 | 527 | EXPORT_SYMBOL(input_close_device); |
1da177e4 | 528 | |
8006479c DT |
529 | /* |
530 | * Prepare device for unregistering | |
531 | */ | |
532 | static void input_disconnect_device(struct input_dev *dev) | |
533 | { | |
534 | struct input_handle *handle; | |
535 | int code; | |
536 | ||
537 | /* | |
538 | * Mark device as going away. Note that we take dev->mutex here | |
539 | * not to protect access to dev->going_away but rather to ensure | |
540 | * that there are no threads in the middle of input_open_device() | |
541 | */ | |
542 | mutex_lock(&dev->mutex); | |
ffd0db97 | 543 | dev->going_away = true; |
8006479c DT |
544 | mutex_unlock(&dev->mutex); |
545 | ||
546 | spin_lock_irq(&dev->event_lock); | |
547 | ||
548 | /* | |
549 | * Simulate keyup events for all pressed keys so that handlers | |
550 | * are not left with "stuck" keys. The driver may continue | |
551 | * generate events even after we done here but they will not | |
552 | * reach any handlers. | |
553 | */ | |
554 | if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) { | |
555 | for (code = 0; code <= KEY_MAX; code++) { | |
556 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
f4f37c8e | 557 | __test_and_clear_bit(code, dev->key)) { |
8006479c DT |
558 | input_pass_event(dev, EV_KEY, code, 0); |
559 | } | |
560 | } | |
561 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
562 | } | |
563 | ||
564 | list_for_each_entry(handle, &dev->h_list, d_node) | |
565 | handle->open = 0; | |
566 | ||
567 | spin_unlock_irq(&dev->event_lock); | |
568 | } | |
569 | ||
c8e4c772 MR |
570 | static int input_fetch_keycode(struct input_dev *dev, int scancode) |
571 | { | |
572 | switch (dev->keycodesize) { | |
573 | case 1: | |
574 | return ((u8 *)dev->keycode)[scancode]; | |
575 | ||
576 | case 2: | |
577 | return ((u16 *)dev->keycode)[scancode]; | |
578 | ||
579 | default: | |
580 | return ((u32 *)dev->keycode)[scancode]; | |
581 | } | |
582 | } | |
583 | ||
584 | static int input_default_getkeycode(struct input_dev *dev, | |
58b93995 DT |
585 | unsigned int scancode, |
586 | unsigned int *keycode) | |
c8e4c772 MR |
587 | { |
588 | if (!dev->keycodesize) | |
589 | return -EINVAL; | |
590 | ||
f4f37c8e | 591 | if (scancode >= dev->keycodemax) |
c8e4c772 MR |
592 | return -EINVAL; |
593 | ||
594 | *keycode = input_fetch_keycode(dev, scancode); | |
595 | ||
596 | return 0; | |
597 | } | |
598 | ||
599 | static int input_default_setkeycode(struct input_dev *dev, | |
58b93995 DT |
600 | unsigned int scancode, |
601 | unsigned int keycode) | |
c8e4c772 MR |
602 | { |
603 | int old_keycode; | |
604 | int i; | |
605 | ||
f4f37c8e | 606 | if (scancode >= dev->keycodemax) |
c8e4c772 MR |
607 | return -EINVAL; |
608 | ||
609 | if (!dev->keycodesize) | |
610 | return -EINVAL; | |
611 | ||
612 | if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8))) | |
613 | return -EINVAL; | |
614 | ||
615 | switch (dev->keycodesize) { | |
616 | case 1: { | |
617 | u8 *k = (u8 *)dev->keycode; | |
618 | old_keycode = k[scancode]; | |
619 | k[scancode] = keycode; | |
620 | break; | |
621 | } | |
622 | case 2: { | |
623 | u16 *k = (u16 *)dev->keycode; | |
624 | old_keycode = k[scancode]; | |
625 | k[scancode] = keycode; | |
626 | break; | |
627 | } | |
628 | default: { | |
629 | u32 *k = (u32 *)dev->keycode; | |
630 | old_keycode = k[scancode]; | |
631 | k[scancode] = keycode; | |
632 | break; | |
633 | } | |
634 | } | |
635 | ||
4f93df40 DT |
636 | __clear_bit(old_keycode, dev->keybit); |
637 | __set_bit(keycode, dev->keybit); | |
c8e4c772 MR |
638 | |
639 | for (i = 0; i < dev->keycodemax; i++) { | |
640 | if (input_fetch_keycode(dev, i) == old_keycode) { | |
4f93df40 | 641 | __set_bit(old_keycode, dev->keybit); |
c8e4c772 MR |
642 | break; /* Setting the bit twice is useless, so break */ |
643 | } | |
644 | } | |
645 | ||
646 | return 0; | |
647 | } | |
648 | ||
f4f37c8e DT |
649 | /** |
650 | * input_get_keycode - retrieve keycode currently mapped to a given scancode | |
651 | * @dev: input device which keymap is being queried | |
652 | * @scancode: scancode (or its equivalent for device in question) for which | |
653 | * keycode is needed | |
654 | * @keycode: result | |
655 | * | |
656 | * This function should be called by anyone interested in retrieving current | |
657 | * keymap. Presently keyboard and evdev handlers use it. | |
658 | */ | |
58b93995 DT |
659 | int input_get_keycode(struct input_dev *dev, |
660 | unsigned int scancode, unsigned int *keycode) | |
f4f37c8e | 661 | { |
f4f37c8e DT |
662 | return dev->getkeycode(dev, scancode, keycode); |
663 | } | |
664 | EXPORT_SYMBOL(input_get_keycode); | |
665 | ||
666 | /** | |
667 | * input_get_keycode - assign new keycode to a given scancode | |
668 | * @dev: input device which keymap is being updated | |
669 | * @scancode: scancode (or its equivalent for device in question) | |
670 | * @keycode: new keycode to be assigned to the scancode | |
671 | * | |
672 | * This function should be called by anyone needing to update current | |
673 | * keymap. Presently keyboard and evdev handlers use it. | |
674 | */ | |
58b93995 DT |
675 | int input_set_keycode(struct input_dev *dev, |
676 | unsigned int scancode, unsigned int keycode) | |
f4f37c8e DT |
677 | { |
678 | unsigned long flags; | |
679 | int old_keycode; | |
680 | int retval; | |
681 | ||
58b93995 | 682 | if (keycode > KEY_MAX) |
f4f37c8e DT |
683 | return -EINVAL; |
684 | ||
685 | spin_lock_irqsave(&dev->event_lock, flags); | |
686 | ||
687 | retval = dev->getkeycode(dev, scancode, &old_keycode); | |
688 | if (retval) | |
689 | goto out; | |
690 | ||
691 | retval = dev->setkeycode(dev, scancode, keycode); | |
692 | if (retval) | |
693 | goto out; | |
694 | ||
4f93df40 DT |
695 | /* Make sure KEY_RESERVED did not get enabled. */ |
696 | __clear_bit(KEY_RESERVED, dev->keybit); | |
697 | ||
f4f37c8e DT |
698 | /* |
699 | * Simulate keyup event if keycode is not present | |
700 | * in the keymap anymore | |
701 | */ | |
702 | if (test_bit(EV_KEY, dev->evbit) && | |
703 | !is_event_supported(old_keycode, dev->keybit, KEY_MAX) && | |
704 | __test_and_clear_bit(old_keycode, dev->key)) { | |
705 | ||
706 | input_pass_event(dev, EV_KEY, old_keycode, 0); | |
707 | if (dev->sync) | |
708 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
709 | } | |
710 | ||
711 | out: | |
712 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
713 | ||
714 | return retval; | |
715 | } | |
716 | EXPORT_SYMBOL(input_set_keycode); | |
c8e4c772 | 717 | |
1da177e4 | 718 | #define MATCH_BIT(bit, max) \ |
7b19ada2 | 719 | for (i = 0; i < BITS_TO_LONGS(max); i++) \ |
1da177e4 LT |
720 | if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \ |
721 | break; \ | |
7b19ada2 | 722 | if (i != BITS_TO_LONGS(max)) \ |
1da177e4 LT |
723 | continue; |
724 | ||
0b7024ac | 725 | static const struct input_device_id *input_match_device(struct input_handler *handler, |
66e66118 | 726 | struct input_dev *dev) |
1da177e4 | 727 | { |
0b7024ac | 728 | const struct input_device_id *id; |
1da177e4 LT |
729 | int i; |
730 | ||
0b7024ac | 731 | for (id = handler->id_table; id->flags || id->driver_info; id++) { |
1da177e4 LT |
732 | |
733 | if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) | |
ddc5d341 | 734 | if (id->bustype != dev->id.bustype) |
1da177e4 LT |
735 | continue; |
736 | ||
737 | if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) | |
ddc5d341 | 738 | if (id->vendor != dev->id.vendor) |
1da177e4 LT |
739 | continue; |
740 | ||
741 | if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) | |
ddc5d341 | 742 | if (id->product != dev->id.product) |
1da177e4 LT |
743 | continue; |
744 | ||
745 | if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) | |
ddc5d341 | 746 | if (id->version != dev->id.version) |
1da177e4 LT |
747 | continue; |
748 | ||
749 | MATCH_BIT(evbit, EV_MAX); | |
750 | MATCH_BIT(keybit, KEY_MAX); | |
751 | MATCH_BIT(relbit, REL_MAX); | |
752 | MATCH_BIT(absbit, ABS_MAX); | |
753 | MATCH_BIT(mscbit, MSC_MAX); | |
754 | MATCH_BIT(ledbit, LED_MAX); | |
755 | MATCH_BIT(sndbit, SND_MAX); | |
756 | MATCH_BIT(ffbit, FF_MAX); | |
ff13f98b | 757 | MATCH_BIT(swbit, SW_MAX); |
1da177e4 | 758 | |
0b7024ac DT |
759 | if (!handler->match || handler->match(handler, dev)) |
760 | return id; | |
1da177e4 LT |
761 | } |
762 | ||
763 | return NULL; | |
764 | } | |
765 | ||
5b2a0826 DT |
766 | static int input_attach_handler(struct input_dev *dev, struct input_handler *handler) |
767 | { | |
768 | const struct input_device_id *id; | |
769 | int error; | |
770 | ||
0b7024ac | 771 | id = input_match_device(handler, dev); |
5b2a0826 DT |
772 | if (!id) |
773 | return -ENODEV; | |
774 | ||
775 | error = handler->connect(handler, dev, id); | |
776 | if (error && error != -ENODEV) | |
777 | printk(KERN_ERR | |
778 | "input: failed to attach handler %s to device %s, " | |
779 | "error: %d\n", | |
9657d75c | 780 | handler->name, kobject_name(&dev->dev.kobj), error); |
5b2a0826 DT |
781 | |
782 | return error; | |
783 | } | |
784 | ||
15e184af DT |
785 | #ifdef CONFIG_COMPAT |
786 | ||
787 | static int input_bits_to_string(char *buf, int buf_size, | |
788 | unsigned long bits, bool skip_empty) | |
789 | { | |
790 | int len = 0; | |
791 | ||
792 | if (INPUT_COMPAT_TEST) { | |
793 | u32 dword = bits >> 32; | |
794 | if (dword || !skip_empty) | |
795 | len += snprintf(buf, buf_size, "%x ", dword); | |
796 | ||
797 | dword = bits & 0xffffffffUL; | |
798 | if (dword || !skip_empty || len) | |
799 | len += snprintf(buf + len, max(buf_size - len, 0), | |
800 | "%x", dword); | |
801 | } else { | |
802 | if (bits || !skip_empty) | |
803 | len += snprintf(buf, buf_size, "%lx", bits); | |
804 | } | |
805 | ||
806 | return len; | |
807 | } | |
808 | ||
809 | #else /* !CONFIG_COMPAT */ | |
810 | ||
811 | static int input_bits_to_string(char *buf, int buf_size, | |
812 | unsigned long bits, bool skip_empty) | |
813 | { | |
814 | return bits || !skip_empty ? | |
815 | snprintf(buf, buf_size, "%lx", bits) : 0; | |
816 | } | |
817 | ||
818 | #endif | |
5b2a0826 | 819 | |
f96b434d DT |
820 | #ifdef CONFIG_PROC_FS |
821 | ||
822 | static struct proc_dir_entry *proc_bus_input_dir; | |
823 | static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); | |
824 | static int input_devices_state; | |
825 | ||
826 | static inline void input_wakeup_procfs_readers(void) | |
827 | { | |
828 | input_devices_state++; | |
829 | wake_up(&input_devices_poll_wait); | |
830 | } | |
831 | ||
969b21cd | 832 | static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait) |
f96b434d | 833 | { |
f96b434d | 834 | poll_wait(file, &input_devices_poll_wait, wait); |
fa886612 DT |
835 | if (file->f_version != input_devices_state) { |
836 | file->f_version = input_devices_state; | |
f96b434d | 837 | return POLLIN | POLLRDNORM; |
fa886612 | 838 | } |
1e0afb28 | 839 | |
f96b434d DT |
840 | return 0; |
841 | } | |
842 | ||
1572ca2a DT |
843 | union input_seq_state { |
844 | struct { | |
845 | unsigned short pos; | |
846 | bool mutex_acquired; | |
847 | }; | |
848 | void *p; | |
849 | }; | |
850 | ||
969b21cd DT |
851 | static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) |
852 | { | |
1572ca2a DT |
853 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
854 | int error; | |
855 | ||
856 | /* We need to fit into seq->private pointer */ | |
857 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
858 | ||
859 | error = mutex_lock_interruptible(&input_mutex); | |
860 | if (error) { | |
861 | state->mutex_acquired = false; | |
862 | return ERR_PTR(error); | |
863 | } | |
864 | ||
865 | state->mutex_acquired = true; | |
f96b434d | 866 | |
ad5d972c | 867 | return seq_list_start(&input_dev_list, *pos); |
969b21cd | 868 | } |
051b2fea | 869 | |
969b21cd DT |
870 | static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
871 | { | |
ad5d972c | 872 | return seq_list_next(v, &input_dev_list, pos); |
969b21cd | 873 | } |
f96b434d | 874 | |
1572ca2a | 875 | static void input_seq_stop(struct seq_file *seq, void *v) |
969b21cd | 876 | { |
1572ca2a DT |
877 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
878 | ||
879 | if (state->mutex_acquired) | |
880 | mutex_unlock(&input_mutex); | |
969b21cd | 881 | } |
f96b434d | 882 | |
969b21cd DT |
883 | static void input_seq_print_bitmap(struct seq_file *seq, const char *name, |
884 | unsigned long *bitmap, int max) | |
885 | { | |
886 | int i; | |
15e184af DT |
887 | bool skip_empty = true; |
888 | char buf[18]; | |
f96b434d | 889 | |
969b21cd | 890 | seq_printf(seq, "B: %s=", name); |
15e184af DT |
891 | |
892 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
893 | if (input_bits_to_string(buf, sizeof(buf), | |
894 | bitmap[i], skip_empty)) { | |
895 | skip_empty = false; | |
896 | seq_printf(seq, "%s%s", buf, i > 0 ? " " : ""); | |
897 | } | |
898 | } | |
899 | ||
900 | /* | |
901 | * If no output was produced print a single 0. | |
902 | */ | |
903 | if (skip_empty) | |
904 | seq_puts(seq, "0"); | |
905 | ||
969b21cd DT |
906 | seq_putc(seq, '\n'); |
907 | } | |
f96b434d | 908 | |
969b21cd DT |
909 | static int input_devices_seq_show(struct seq_file *seq, void *v) |
910 | { | |
911 | struct input_dev *dev = container_of(v, struct input_dev, node); | |
9657d75c | 912 | const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
969b21cd DT |
913 | struct input_handle *handle; |
914 | ||
915 | seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", | |
916 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); | |
917 | ||
918 | seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); | |
919 | seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : ""); | |
920 | seq_printf(seq, "S: Sysfs=%s\n", path ? path : ""); | |
15e03ae8 | 921 | seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : ""); |
969b21cd DT |
922 | seq_printf(seq, "H: Handlers="); |
923 | ||
924 | list_for_each_entry(handle, &dev->h_list, d_node) | |
925 | seq_printf(seq, "%s ", handle->name); | |
926 | seq_putc(seq, '\n'); | |
927 | ||
928 | input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); | |
929 | if (test_bit(EV_KEY, dev->evbit)) | |
930 | input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); | |
931 | if (test_bit(EV_REL, dev->evbit)) | |
932 | input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); | |
933 | if (test_bit(EV_ABS, dev->evbit)) | |
934 | input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); | |
935 | if (test_bit(EV_MSC, dev->evbit)) | |
936 | input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); | |
937 | if (test_bit(EV_LED, dev->evbit)) | |
938 | input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); | |
939 | if (test_bit(EV_SND, dev->evbit)) | |
940 | input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); | |
941 | if (test_bit(EV_FF, dev->evbit)) | |
942 | input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); | |
943 | if (test_bit(EV_SW, dev->evbit)) | |
944 | input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); | |
945 | ||
946 | seq_putc(seq, '\n'); | |
947 | ||
948 | kfree(path); | |
949 | return 0; | |
f96b434d DT |
950 | } |
951 | ||
cec69c37 | 952 | static const struct seq_operations input_devices_seq_ops = { |
969b21cd DT |
953 | .start = input_devices_seq_start, |
954 | .next = input_devices_seq_next, | |
1572ca2a | 955 | .stop = input_seq_stop, |
969b21cd DT |
956 | .show = input_devices_seq_show, |
957 | }; | |
958 | ||
959 | static int input_proc_devices_open(struct inode *inode, struct file *file) | |
f96b434d | 960 | { |
969b21cd DT |
961 | return seq_open(file, &input_devices_seq_ops); |
962 | } | |
963 | ||
2b8693c0 | 964 | static const struct file_operations input_devices_fileops = { |
969b21cd DT |
965 | .owner = THIS_MODULE, |
966 | .open = input_proc_devices_open, | |
967 | .poll = input_proc_devices_poll, | |
968 | .read = seq_read, | |
969 | .llseek = seq_lseek, | |
970 | .release = seq_release, | |
971 | }; | |
972 | ||
973 | static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) | |
974 | { | |
1572ca2a DT |
975 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
976 | int error; | |
977 | ||
978 | /* We need to fit into seq->private pointer */ | |
979 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
980 | ||
981 | error = mutex_lock_interruptible(&input_mutex); | |
982 | if (error) { | |
983 | state->mutex_acquired = false; | |
984 | return ERR_PTR(error); | |
985 | } | |
986 | ||
987 | state->mutex_acquired = true; | |
988 | state->pos = *pos; | |
8006479c | 989 | |
ad5d972c | 990 | return seq_list_start(&input_handler_list, *pos); |
969b21cd | 991 | } |
f96b434d | 992 | |
969b21cd DT |
993 | static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
994 | { | |
1572ca2a | 995 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
f96b434d | 996 | |
1572ca2a DT |
997 | state->pos = *pos + 1; |
998 | return seq_list_next(v, &input_handler_list, pos); | |
969b21cd DT |
999 | } |
1000 | ||
1001 | static int input_handlers_seq_show(struct seq_file *seq, void *v) | |
1002 | { | |
1003 | struct input_handler *handler = container_of(v, struct input_handler, node); | |
1572ca2a | 1004 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
969b21cd | 1005 | |
1572ca2a | 1006 | seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name); |
ef7995f4 DT |
1007 | if (handler->filter) |
1008 | seq_puts(seq, " (filter)"); | |
969b21cd DT |
1009 | if (handler->fops) |
1010 | seq_printf(seq, " Minor=%d", handler->minor); | |
1011 | seq_putc(seq, '\n'); | |
1012 | ||
1013 | return 0; | |
1014 | } | |
1572ca2a | 1015 | |
cec69c37 | 1016 | static const struct seq_operations input_handlers_seq_ops = { |
969b21cd DT |
1017 | .start = input_handlers_seq_start, |
1018 | .next = input_handlers_seq_next, | |
1572ca2a | 1019 | .stop = input_seq_stop, |
969b21cd DT |
1020 | .show = input_handlers_seq_show, |
1021 | }; | |
1022 | ||
1023 | static int input_proc_handlers_open(struct inode *inode, struct file *file) | |
1024 | { | |
1025 | return seq_open(file, &input_handlers_seq_ops); | |
1026 | } | |
1027 | ||
2b8693c0 | 1028 | static const struct file_operations input_handlers_fileops = { |
969b21cd DT |
1029 | .owner = THIS_MODULE, |
1030 | .open = input_proc_handlers_open, | |
1031 | .read = seq_read, | |
1032 | .llseek = seq_lseek, | |
1033 | .release = seq_release, | |
1034 | }; | |
f96b434d DT |
1035 | |
1036 | static int __init input_proc_init(void) | |
1037 | { | |
1038 | struct proc_dir_entry *entry; | |
1039 | ||
9c37066d | 1040 | proc_bus_input_dir = proc_mkdir("bus/input", NULL); |
f96b434d DT |
1041 | if (!proc_bus_input_dir) |
1042 | return -ENOMEM; | |
1043 | ||
c7705f34 DL |
1044 | entry = proc_create("devices", 0, proc_bus_input_dir, |
1045 | &input_devices_fileops); | |
f96b434d DT |
1046 | if (!entry) |
1047 | goto fail1; | |
1048 | ||
c7705f34 DL |
1049 | entry = proc_create("handlers", 0, proc_bus_input_dir, |
1050 | &input_handlers_fileops); | |
f96b434d DT |
1051 | if (!entry) |
1052 | goto fail2; | |
1053 | ||
f96b434d DT |
1054 | return 0; |
1055 | ||
1056 | fail2: remove_proc_entry("devices", proc_bus_input_dir); | |
9c37066d | 1057 | fail1: remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1058 | return -ENOMEM; |
1059 | } | |
1060 | ||
beffbdc2 | 1061 | static void input_proc_exit(void) |
f96b434d DT |
1062 | { |
1063 | remove_proc_entry("devices", proc_bus_input_dir); | |
1064 | remove_proc_entry("handlers", proc_bus_input_dir); | |
9c37066d | 1065 | remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1066 | } |
1067 | ||
1068 | #else /* !CONFIG_PROC_FS */ | |
1069 | static inline void input_wakeup_procfs_readers(void) { } | |
1070 | static inline int input_proc_init(void) { return 0; } | |
1071 | static inline void input_proc_exit(void) { } | |
1072 | #endif | |
1073 | ||
9657d75c DT |
1074 | #define INPUT_DEV_STRING_ATTR_SHOW(name) \ |
1075 | static ssize_t input_dev_show_##name(struct device *dev, \ | |
1076 | struct device_attribute *attr, \ | |
1077 | char *buf) \ | |
1078 | { \ | |
1079 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1080 | \ | |
1081 | return scnprintf(buf, PAGE_SIZE, "%s\n", \ | |
1082 | input_dev->name ? input_dev->name : ""); \ | |
1083 | } \ | |
1084 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL) | |
5c1e9a6a DT |
1085 | |
1086 | INPUT_DEV_STRING_ATTR_SHOW(name); | |
1087 | INPUT_DEV_STRING_ATTR_SHOW(phys); | |
1088 | INPUT_DEV_STRING_ATTR_SHOW(uniq); | |
1089 | ||
ac648a6a DT |
1090 | static int input_print_modalias_bits(char *buf, int size, |
1091 | char name, unsigned long *bm, | |
1092 | unsigned int min_bit, unsigned int max_bit) | |
1d8f430c | 1093 | { |
ac648a6a | 1094 | int len = 0, i; |
1d8f430c | 1095 | |
ac648a6a DT |
1096 | len += snprintf(buf, max(size, 0), "%c", name); |
1097 | for (i = min_bit; i < max_bit; i++) | |
7b19ada2 | 1098 | if (bm[BIT_WORD(i)] & BIT_MASK(i)) |
ac648a6a | 1099 | len += snprintf(buf + len, max(size - len, 0), "%X,", i); |
1d8f430c RR |
1100 | return len; |
1101 | } | |
1102 | ||
2db66876 DT |
1103 | static int input_print_modalias(char *buf, int size, struct input_dev *id, |
1104 | int add_cr) | |
1d8f430c | 1105 | { |
bd37e5a9 | 1106 | int len; |
1d8f430c | 1107 | |
ac648a6a DT |
1108 | len = snprintf(buf, max(size, 0), |
1109 | "input:b%04Xv%04Xp%04Xe%04X-", | |
1110 | id->id.bustype, id->id.vendor, | |
1111 | id->id.product, id->id.version); | |
1112 | ||
1113 | len += input_print_modalias_bits(buf + len, size - len, | |
1114 | 'e', id->evbit, 0, EV_MAX); | |
1115 | len += input_print_modalias_bits(buf + len, size - len, | |
1116 | 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); | |
1117 | len += input_print_modalias_bits(buf + len, size - len, | |
1118 | 'r', id->relbit, 0, REL_MAX); | |
1119 | len += input_print_modalias_bits(buf + len, size - len, | |
1120 | 'a', id->absbit, 0, ABS_MAX); | |
1121 | len += input_print_modalias_bits(buf + len, size - len, | |
1122 | 'm', id->mscbit, 0, MSC_MAX); | |
1123 | len += input_print_modalias_bits(buf + len, size - len, | |
1124 | 'l', id->ledbit, 0, LED_MAX); | |
1125 | len += input_print_modalias_bits(buf + len, size - len, | |
1126 | 's', id->sndbit, 0, SND_MAX); | |
1127 | len += input_print_modalias_bits(buf + len, size - len, | |
1128 | 'f', id->ffbit, 0, FF_MAX); | |
1129 | len += input_print_modalias_bits(buf + len, size - len, | |
1130 | 'w', id->swbit, 0, SW_MAX); | |
2db66876 DT |
1131 | |
1132 | if (add_cr) | |
ac648a6a | 1133 | len += snprintf(buf + len, max(size - len, 0), "\n"); |
2db66876 | 1134 | |
bd37e5a9 KS |
1135 | return len; |
1136 | } | |
1137 | ||
9657d75c DT |
1138 | static ssize_t input_dev_show_modalias(struct device *dev, |
1139 | struct device_attribute *attr, | |
1140 | char *buf) | |
bd37e5a9 KS |
1141 | { |
1142 | struct input_dev *id = to_input_dev(dev); | |
1143 | ssize_t len; | |
1144 | ||
2db66876 DT |
1145 | len = input_print_modalias(buf, PAGE_SIZE, id, 1); |
1146 | ||
8a3cf456 | 1147 | return min_t(int, len, PAGE_SIZE); |
1d8f430c | 1148 | } |
9657d75c | 1149 | static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); |
1d8f430c | 1150 | |
629b77a4 | 1151 | static struct attribute *input_dev_attrs[] = { |
9657d75c DT |
1152 | &dev_attr_name.attr, |
1153 | &dev_attr_phys.attr, | |
1154 | &dev_attr_uniq.attr, | |
1155 | &dev_attr_modalias.attr, | |
629b77a4 GKH |
1156 | NULL |
1157 | }; | |
1158 | ||
bd0ef235 | 1159 | static struct attribute_group input_dev_attr_group = { |
629b77a4 | 1160 | .attrs = input_dev_attrs, |
5c1e9a6a DT |
1161 | }; |
1162 | ||
9657d75c DT |
1163 | #define INPUT_DEV_ID_ATTR(name) \ |
1164 | static ssize_t input_dev_show_id_##name(struct device *dev, \ | |
1165 | struct device_attribute *attr, \ | |
1166 | char *buf) \ | |
1167 | { \ | |
1168 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1169 | return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \ | |
1170 | } \ | |
1171 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL) | |
5c1e9a6a DT |
1172 | |
1173 | INPUT_DEV_ID_ATTR(bustype); | |
1174 | INPUT_DEV_ID_ATTR(vendor); | |
1175 | INPUT_DEV_ID_ATTR(product); | |
1176 | INPUT_DEV_ID_ATTR(version); | |
1177 | ||
1178 | static struct attribute *input_dev_id_attrs[] = { | |
9657d75c DT |
1179 | &dev_attr_bustype.attr, |
1180 | &dev_attr_vendor.attr, | |
1181 | &dev_attr_product.attr, | |
1182 | &dev_attr_version.attr, | |
5c1e9a6a DT |
1183 | NULL |
1184 | }; | |
1185 | ||
1186 | static struct attribute_group input_dev_id_attr_group = { | |
1187 | .name = "id", | |
1188 | .attrs = input_dev_id_attrs, | |
1189 | }; | |
1190 | ||
969b21cd DT |
1191 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1192 | int max, int add_cr) | |
1193 | { | |
1194 | int i; | |
1195 | int len = 0; | |
15e184af DT |
1196 | bool skip_empty = true; |
1197 | ||
1198 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
1199 | len += input_bits_to_string(buf + len, max(buf_size - len, 0), | |
1200 | bitmap[i], skip_empty); | |
1201 | if (len) { | |
1202 | skip_empty = false; | |
1203 | if (i > 0) | |
1204 | len += snprintf(buf + len, max(buf_size - len, 0), " "); | |
1205 | } | |
1206 | } | |
969b21cd | 1207 | |
15e184af DT |
1208 | /* |
1209 | * If no output was produced print a single 0. | |
1210 | */ | |
1211 | if (len == 0) | |
1212 | len = snprintf(buf, buf_size, "%d", 0); | |
969b21cd DT |
1213 | |
1214 | if (add_cr) | |
1215 | len += snprintf(buf + len, max(buf_size - len, 0), "\n"); | |
1216 | ||
1217 | return len; | |
1218 | } | |
1219 | ||
9657d75c DT |
1220 | #define INPUT_DEV_CAP_ATTR(ev, bm) \ |
1221 | static ssize_t input_dev_show_cap_##bm(struct device *dev, \ | |
1222 | struct device_attribute *attr, \ | |
1223 | char *buf) \ | |
1224 | { \ | |
1225 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1226 | int len = input_print_bitmap(buf, PAGE_SIZE, \ | |
15e184af DT |
1227 | input_dev->bm##bit, ev##_MAX, \ |
1228 | true); \ | |
9657d75c DT |
1229 | return min_t(int, len, PAGE_SIZE); \ |
1230 | } \ | |
1231 | static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL) | |
5c1e9a6a DT |
1232 | |
1233 | INPUT_DEV_CAP_ATTR(EV, ev); | |
1234 | INPUT_DEV_CAP_ATTR(KEY, key); | |
1235 | INPUT_DEV_CAP_ATTR(REL, rel); | |
1236 | INPUT_DEV_CAP_ATTR(ABS, abs); | |
1237 | INPUT_DEV_CAP_ATTR(MSC, msc); | |
1238 | INPUT_DEV_CAP_ATTR(LED, led); | |
1239 | INPUT_DEV_CAP_ATTR(SND, snd); | |
1240 | INPUT_DEV_CAP_ATTR(FF, ff); | |
1241 | INPUT_DEV_CAP_ATTR(SW, sw); | |
1242 | ||
1243 | static struct attribute *input_dev_caps_attrs[] = { | |
9657d75c DT |
1244 | &dev_attr_ev.attr, |
1245 | &dev_attr_key.attr, | |
1246 | &dev_attr_rel.attr, | |
1247 | &dev_attr_abs.attr, | |
1248 | &dev_attr_msc.attr, | |
1249 | &dev_attr_led.attr, | |
1250 | &dev_attr_snd.attr, | |
1251 | &dev_attr_ff.attr, | |
1252 | &dev_attr_sw.attr, | |
5c1e9a6a DT |
1253 | NULL |
1254 | }; | |
1255 | ||
1256 | static struct attribute_group input_dev_caps_attr_group = { | |
1257 | .name = "capabilities", | |
1258 | .attrs = input_dev_caps_attrs, | |
1259 | }; | |
1260 | ||
a4dbd674 | 1261 | static const struct attribute_group *input_dev_attr_groups[] = { |
cb9def4d DT |
1262 | &input_dev_attr_group, |
1263 | &input_dev_id_attr_group, | |
1264 | &input_dev_caps_attr_group, | |
1265 | NULL | |
1266 | }; | |
1267 | ||
9657d75c | 1268 | static void input_dev_release(struct device *device) |
d19fbe8a | 1269 | { |
9657d75c | 1270 | struct input_dev *dev = to_input_dev(device); |
d19fbe8a | 1271 | |
509ca1a9 | 1272 | input_ff_destroy(dev); |
d19fbe8a | 1273 | kfree(dev); |
509ca1a9 | 1274 | |
d19fbe8a DT |
1275 | module_put(THIS_MODULE); |
1276 | } | |
1277 | ||
a7fadbe1 | 1278 | /* |
312c004d | 1279 | * Input uevent interface - loading event handlers based on |
a7fadbe1 DT |
1280 | * device bitfields. |
1281 | */ | |
7eff2e7a | 1282 | static int input_add_uevent_bm_var(struct kobj_uevent_env *env, |
ac648a6a | 1283 | const char *name, unsigned long *bitmap, int max) |
a7fadbe1 | 1284 | { |
7eff2e7a | 1285 | int len; |
a7fadbe1 | 1286 | |
7eff2e7a | 1287 | if (add_uevent_var(env, "%s=", name)) |
a7fadbe1 DT |
1288 | return -ENOMEM; |
1289 | ||
7eff2e7a KS |
1290 | len = input_print_bitmap(&env->buf[env->buflen - 1], |
1291 | sizeof(env->buf) - env->buflen, | |
15e184af | 1292 | bitmap, max, false); |
7eff2e7a | 1293 | if (len >= (sizeof(env->buf) - env->buflen)) |
a7fadbe1 DT |
1294 | return -ENOMEM; |
1295 | ||
7eff2e7a | 1296 | env->buflen += len; |
a7fadbe1 DT |
1297 | return 0; |
1298 | } | |
1299 | ||
7eff2e7a | 1300 | static int input_add_uevent_modalias_var(struct kobj_uevent_env *env, |
ac648a6a DT |
1301 | struct input_dev *dev) |
1302 | { | |
7eff2e7a | 1303 | int len; |
ac648a6a | 1304 | |
7eff2e7a | 1305 | if (add_uevent_var(env, "MODALIAS=")) |
ac648a6a DT |
1306 | return -ENOMEM; |
1307 | ||
7eff2e7a KS |
1308 | len = input_print_modalias(&env->buf[env->buflen - 1], |
1309 | sizeof(env->buf) - env->buflen, | |
1310 | dev, 0); | |
1311 | if (len >= (sizeof(env->buf) - env->buflen)) | |
ac648a6a DT |
1312 | return -ENOMEM; |
1313 | ||
7eff2e7a | 1314 | env->buflen += len; |
ac648a6a DT |
1315 | return 0; |
1316 | } | |
1317 | ||
a7fadbe1 DT |
1318 | #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \ |
1319 | do { \ | |
7eff2e7a | 1320 | int err = add_uevent_var(env, fmt, val); \ |
a7fadbe1 DT |
1321 | if (err) \ |
1322 | return err; \ | |
1323 | } while (0) | |
1324 | ||
1325 | #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \ | |
1326 | do { \ | |
7eff2e7a | 1327 | int err = input_add_uevent_bm_var(env, name, bm, max); \ |
a7fadbe1 DT |
1328 | if (err) \ |
1329 | return err; \ | |
1330 | } while (0) | |
1331 | ||
ac648a6a DT |
1332 | #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \ |
1333 | do { \ | |
7eff2e7a | 1334 | int err = input_add_uevent_modalias_var(env, dev); \ |
ac648a6a DT |
1335 | if (err) \ |
1336 | return err; \ | |
1337 | } while (0) | |
1338 | ||
7eff2e7a | 1339 | static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env) |
a7fadbe1 | 1340 | { |
9657d75c | 1341 | struct input_dev *dev = to_input_dev(device); |
a7fadbe1 DT |
1342 | |
1343 | INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x", | |
1344 | dev->id.bustype, dev->id.vendor, | |
1345 | dev->id.product, dev->id.version); | |
1346 | if (dev->name) | |
1347 | INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); | |
1348 | if (dev->phys) | |
1349 | INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); | |
08de1f04 | 1350 | if (dev->uniq) |
a7fadbe1 DT |
1351 | INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); |
1352 | ||
1353 | INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX); | |
1354 | if (test_bit(EV_KEY, dev->evbit)) | |
1355 | INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX); | |
1356 | if (test_bit(EV_REL, dev->evbit)) | |
1357 | INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX); | |
1358 | if (test_bit(EV_ABS, dev->evbit)) | |
1359 | INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX); | |
1360 | if (test_bit(EV_MSC, dev->evbit)) | |
1361 | INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX); | |
1362 | if (test_bit(EV_LED, dev->evbit)) | |
1363 | INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX); | |
1364 | if (test_bit(EV_SND, dev->evbit)) | |
1365 | INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX); | |
1366 | if (test_bit(EV_FF, dev->evbit)) | |
1367 | INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX); | |
1368 | if (test_bit(EV_SW, dev->evbit)) | |
1369 | INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); | |
1370 | ||
ac648a6a | 1371 | INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); |
a7fadbe1 DT |
1372 | |
1373 | return 0; | |
1374 | } | |
1375 | ||
3cc96351 DT |
1376 | #define INPUT_DO_TOGGLE(dev, type, bits, on) \ |
1377 | do { \ | |
1378 | int i; \ | |
1379 | bool active; \ | |
1380 | \ | |
1381 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1382 | break; \ | |
1383 | \ | |
1384 | for (i = 0; i < type##_MAX; i++) { \ | |
1385 | if (!test_bit(i, dev->bits##bit)) \ | |
1386 | continue; \ | |
1387 | \ | |
1388 | active = test_bit(i, dev->bits); \ | |
1389 | if (!active && !on) \ | |
1390 | continue; \ | |
1391 | \ | |
1392 | dev->event(dev, EV_##type, i, on ? active : 0); \ | |
1393 | } \ | |
ffd0db97 DT |
1394 | } while (0) |
1395 | ||
1c4115e5 | 1396 | #ifdef CONFIG_PM |
ffd0db97 DT |
1397 | static void input_dev_reset(struct input_dev *dev, bool activate) |
1398 | { | |
1399 | if (!dev->event) | |
1400 | return; | |
1401 | ||
1402 | INPUT_DO_TOGGLE(dev, LED, led, activate); | |
1403 | INPUT_DO_TOGGLE(dev, SND, snd, activate); | |
1404 | ||
1405 | if (activate && test_bit(EV_REP, dev->evbit)) { | |
1406 | dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]); | |
1407 | dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]); | |
1408 | } | |
1409 | } | |
1410 | ||
ffd0db97 DT |
1411 | static int input_dev_suspend(struct device *dev) |
1412 | { | |
1413 | struct input_dev *input_dev = to_input_dev(dev); | |
1414 | ||
1415 | mutex_lock(&input_dev->mutex); | |
1416 | input_dev_reset(input_dev, false); | |
1417 | mutex_unlock(&input_dev->mutex); | |
1418 | ||
1419 | return 0; | |
1420 | } | |
1421 | ||
1422 | static int input_dev_resume(struct device *dev) | |
1423 | { | |
1424 | struct input_dev *input_dev = to_input_dev(dev); | |
1425 | ||
1426 | mutex_lock(&input_dev->mutex); | |
1427 | input_dev_reset(input_dev, true); | |
1428 | mutex_unlock(&input_dev->mutex); | |
1429 | ||
1430 | return 0; | |
1431 | } | |
1432 | ||
1433 | static const struct dev_pm_ops input_dev_pm_ops = { | |
1434 | .suspend = input_dev_suspend, | |
1435 | .resume = input_dev_resume, | |
1436 | .poweroff = input_dev_suspend, | |
1437 | .restore = input_dev_resume, | |
1438 | }; | |
1439 | #endif /* CONFIG_PM */ | |
1440 | ||
9657d75c DT |
1441 | static struct device_type input_dev_type = { |
1442 | .groups = input_dev_attr_groups, | |
1443 | .release = input_dev_release, | |
1444 | .uevent = input_dev_uevent, | |
ffd0db97 DT |
1445 | #ifdef CONFIG_PM |
1446 | .pm = &input_dev_pm_ops, | |
1447 | #endif | |
9657d75c DT |
1448 | }; |
1449 | ||
e454cea2 | 1450 | static char *input_devnode(struct device *dev, mode_t *mode) |
aa5ed63e KS |
1451 | { |
1452 | return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev)); | |
1453 | } | |
1454 | ||
ea9f240b | 1455 | struct class input_class = { |
9657d75c | 1456 | .name = "input", |
e454cea2 | 1457 | .devnode = input_devnode, |
d19fbe8a | 1458 | }; |
ca56fe07 | 1459 | EXPORT_SYMBOL_GPL(input_class); |
d19fbe8a | 1460 | |
1447190e DT |
1461 | /** |
1462 | * input_allocate_device - allocate memory for new input device | |
1463 | * | |
1464 | * Returns prepared struct input_dev or NULL. | |
1465 | * | |
1466 | * NOTE: Use input_free_device() to free devices that have not been | |
1467 | * registered; input_unregister_device() should be used for already | |
1468 | * registered devices. | |
1469 | */ | |
d19fbe8a DT |
1470 | struct input_dev *input_allocate_device(void) |
1471 | { | |
1472 | struct input_dev *dev; | |
1473 | ||
1474 | dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); | |
1475 | if (dev) { | |
9657d75c DT |
1476 | dev->dev.type = &input_dev_type; |
1477 | dev->dev.class = &input_class; | |
1478 | device_initialize(&dev->dev); | |
f60d2b11 | 1479 | mutex_init(&dev->mutex); |
8006479c | 1480 | spin_lock_init(&dev->event_lock); |
d19fbe8a DT |
1481 | INIT_LIST_HEAD(&dev->h_list); |
1482 | INIT_LIST_HEAD(&dev->node); | |
655816e4 DT |
1483 | |
1484 | __module_get(THIS_MODULE); | |
d19fbe8a DT |
1485 | } |
1486 | ||
1487 | return dev; | |
1488 | } | |
ca56fe07 | 1489 | EXPORT_SYMBOL(input_allocate_device); |
d19fbe8a | 1490 | |
1447190e DT |
1491 | /** |
1492 | * input_free_device - free memory occupied by input_dev structure | |
1493 | * @dev: input device to free | |
1494 | * | |
1495 | * This function should only be used if input_register_device() | |
1496 | * was not called yet or if it failed. Once device was registered | |
1497 | * use input_unregister_device() and memory will be freed once last | |
8006479c | 1498 | * reference to the device is dropped. |
1447190e DT |
1499 | * |
1500 | * Device should be allocated by input_allocate_device(). | |
1501 | * | |
1502 | * NOTE: If there are references to the input device then memory | |
1503 | * will not be freed until last reference is dropped. | |
1504 | */ | |
f60d2b11 DT |
1505 | void input_free_device(struct input_dev *dev) |
1506 | { | |
54f9e36c | 1507 | if (dev) |
f60d2b11 | 1508 | input_put_device(dev); |
f60d2b11 | 1509 | } |
ca56fe07 | 1510 | EXPORT_SYMBOL(input_free_device); |
f60d2b11 | 1511 | |
534565f2 DT |
1512 | /** |
1513 | * input_set_capability - mark device as capable of a certain event | |
1514 | * @dev: device that is capable of emitting or accepting event | |
1515 | * @type: type of the event (EV_KEY, EV_REL, etc...) | |
1516 | * @code: event code | |
1517 | * | |
1518 | * In addition to setting up corresponding bit in appropriate capability | |
1519 | * bitmap the function also adjusts dev->evbit. | |
1520 | */ | |
1521 | void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code) | |
1522 | { | |
1523 | switch (type) { | |
1524 | case EV_KEY: | |
1525 | __set_bit(code, dev->keybit); | |
1526 | break; | |
1527 | ||
1528 | case EV_REL: | |
1529 | __set_bit(code, dev->relbit); | |
1530 | break; | |
1531 | ||
1532 | case EV_ABS: | |
1533 | __set_bit(code, dev->absbit); | |
1534 | break; | |
1535 | ||
1536 | case EV_MSC: | |
1537 | __set_bit(code, dev->mscbit); | |
1538 | break; | |
1539 | ||
1540 | case EV_SW: | |
1541 | __set_bit(code, dev->swbit); | |
1542 | break; | |
1543 | ||
1544 | case EV_LED: | |
1545 | __set_bit(code, dev->ledbit); | |
1546 | break; | |
1547 | ||
1548 | case EV_SND: | |
1549 | __set_bit(code, dev->sndbit); | |
1550 | break; | |
1551 | ||
1552 | case EV_FF: | |
1553 | __set_bit(code, dev->ffbit); | |
1554 | break; | |
1555 | ||
22d1c398 DB |
1556 | case EV_PWR: |
1557 | /* do nothing */ | |
1558 | break; | |
1559 | ||
534565f2 DT |
1560 | default: |
1561 | printk(KERN_ERR | |
1562 | "input_set_capability: unknown type %u (code %u)\n", | |
1563 | type, code); | |
1564 | dump_stack(); | |
1565 | return; | |
1566 | } | |
1567 | ||
1568 | __set_bit(type, dev->evbit); | |
1569 | } | |
1570 | EXPORT_SYMBOL(input_set_capability); | |
1571 | ||
92a3a587 DT |
1572 | #define INPUT_CLEANSE_BITMASK(dev, type, bits) \ |
1573 | do { \ | |
1574 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1575 | memset(dev->bits##bit, 0, \ | |
1576 | sizeof(dev->bits##bit)); \ | |
1577 | } while (0) | |
1578 | ||
1579 | static void input_cleanse_bitmasks(struct input_dev *dev) | |
1580 | { | |
1581 | INPUT_CLEANSE_BITMASK(dev, KEY, key); | |
1582 | INPUT_CLEANSE_BITMASK(dev, REL, rel); | |
1583 | INPUT_CLEANSE_BITMASK(dev, ABS, abs); | |
1584 | INPUT_CLEANSE_BITMASK(dev, MSC, msc); | |
1585 | INPUT_CLEANSE_BITMASK(dev, LED, led); | |
1586 | INPUT_CLEANSE_BITMASK(dev, SND, snd); | |
1587 | INPUT_CLEANSE_BITMASK(dev, FF, ff); | |
1588 | INPUT_CLEANSE_BITMASK(dev, SW, sw); | |
1589 | } | |
1590 | ||
8006479c DT |
1591 | /** |
1592 | * input_register_device - register device with input core | |
1593 | * @dev: device to be registered | |
1594 | * | |
1595 | * This function registers device with input core. The device must be | |
1596 | * allocated with input_allocate_device() and all it's capabilities | |
1597 | * set up before registering. | |
1598 | * If function fails the device must be freed with input_free_device(). | |
1599 | * Once device has been successfully registered it can be unregistered | |
1600 | * with input_unregister_device(); input_free_device() should not be | |
1601 | * called in this case. | |
1602 | */ | |
5f945489 | 1603 | int input_register_device(struct input_dev *dev) |
1da177e4 | 1604 | { |
bd0ef235 | 1605 | static atomic_t input_no = ATOMIC_INIT(0); |
1da177e4 | 1606 | struct input_handler *handler; |
bd0ef235 DT |
1607 | const char *path; |
1608 | int error; | |
1da177e4 | 1609 | |
4f93df40 | 1610 | /* Every input device generates EV_SYN/SYN_REPORT events. */ |
8006479c | 1611 | __set_bit(EV_SYN, dev->evbit); |
0fbf87ca | 1612 | |
4f93df40 DT |
1613 | /* KEY_RESERVED is not supposed to be transmitted to userspace. */ |
1614 | __clear_bit(KEY_RESERVED, dev->keybit); | |
1615 | ||
92a3a587 DT |
1616 | /* Make sure that bitmasks not mentioned in dev->evbit are clean. */ |
1617 | input_cleanse_bitmasks(dev); | |
1618 | ||
1da177e4 LT |
1619 | /* |
1620 | * If delay and period are pre-set by the driver, then autorepeating | |
1621 | * is handled by the driver itself and we don't do it in input.c. | |
1622 | */ | |
1da177e4 LT |
1623 | init_timer(&dev->timer); |
1624 | if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { | |
1625 | dev->timer.data = (long) dev; | |
1626 | dev->timer.function = input_repeat_key; | |
1627 | dev->rep[REP_DELAY] = 250; | |
1628 | dev->rep[REP_PERIOD] = 33; | |
1629 | } | |
1630 | ||
c8e4c772 MR |
1631 | if (!dev->getkeycode) |
1632 | dev->getkeycode = input_default_getkeycode; | |
1633 | ||
1634 | if (!dev->setkeycode) | |
1635 | dev->setkeycode = input_default_setkeycode; | |
1636 | ||
a6c2490f KS |
1637 | dev_set_name(&dev->dev, "input%ld", |
1638 | (unsigned long) atomic_inc_return(&input_no) - 1); | |
bd0ef235 | 1639 | |
9657d75c | 1640 | error = device_add(&dev->dev); |
bd0ef235 DT |
1641 | if (error) |
1642 | return error; | |
1643 | ||
9657d75c | 1644 | path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
bd0ef235 DT |
1645 | printk(KERN_INFO "input: %s as %s\n", |
1646 | dev->name ? dev->name : "Unspecified device", path ? path : "N/A"); | |
1647 | kfree(path); | |
10204020 | 1648 | |
8006479c DT |
1649 | error = mutex_lock_interruptible(&input_mutex); |
1650 | if (error) { | |
1651 | device_del(&dev->dev); | |
1652 | return error; | |
1653 | } | |
1654 | ||
1655 | list_add_tail(&dev->node, &input_dev_list); | |
1656 | ||
1da177e4 | 1657 | list_for_each_entry(handler, &input_handler_list, node) |
5b2a0826 | 1658 | input_attach_handler(dev, handler); |
1da177e4 | 1659 | |
f96b434d | 1660 | input_wakeup_procfs_readers(); |
5f945489 | 1661 | |
8006479c DT |
1662 | mutex_unlock(&input_mutex); |
1663 | ||
5f945489 | 1664 | return 0; |
1da177e4 | 1665 | } |
ca56fe07 | 1666 | EXPORT_SYMBOL(input_register_device); |
1da177e4 | 1667 | |
8006479c DT |
1668 | /** |
1669 | * input_unregister_device - unregister previously registered device | |
1670 | * @dev: device to be unregistered | |
1671 | * | |
1672 | * This function unregisters an input device. Once device is unregistered | |
1673 | * the caller should not try to access it as it may get freed at any moment. | |
1674 | */ | |
1da177e4 LT |
1675 | void input_unregister_device(struct input_dev *dev) |
1676 | { | |
5b2a0826 | 1677 | struct input_handle *handle, *next; |
1da177e4 | 1678 | |
8006479c | 1679 | input_disconnect_device(dev); |
1da177e4 | 1680 | |
8006479c | 1681 | mutex_lock(&input_mutex); |
1da177e4 | 1682 | |
5b2a0826 | 1683 | list_for_each_entry_safe(handle, next, &dev->h_list, d_node) |
1da177e4 | 1684 | handle->handler->disconnect(handle); |
5b2a0826 | 1685 | WARN_ON(!list_empty(&dev->h_list)); |
1da177e4 | 1686 | |
8006479c | 1687 | del_timer_sync(&dev->timer); |
1da177e4 LT |
1688 | list_del_init(&dev->node); |
1689 | ||
f96b434d | 1690 | input_wakeup_procfs_readers(); |
8006479c DT |
1691 | |
1692 | mutex_unlock(&input_mutex); | |
1693 | ||
1694 | device_unregister(&dev->dev); | |
1da177e4 | 1695 | } |
ca56fe07 | 1696 | EXPORT_SYMBOL(input_unregister_device); |
1da177e4 | 1697 | |
8006479c DT |
1698 | /** |
1699 | * input_register_handler - register a new input handler | |
1700 | * @handler: handler to be registered | |
1701 | * | |
1702 | * This function registers a new input handler (interface) for input | |
1703 | * devices in the system and attaches it to all input devices that | |
1704 | * are compatible with the handler. | |
1705 | */ | |
4263cf0f | 1706 | int input_register_handler(struct input_handler *handler) |
1da177e4 LT |
1707 | { |
1708 | struct input_dev *dev; | |
8006479c DT |
1709 | int retval; |
1710 | ||
1711 | retval = mutex_lock_interruptible(&input_mutex); | |
1712 | if (retval) | |
1713 | return retval; | |
1da177e4 | 1714 | |
1da177e4 LT |
1715 | INIT_LIST_HEAD(&handler->h_list); |
1716 | ||
4263cf0f | 1717 | if (handler->fops != NULL) { |
8006479c DT |
1718 | if (input_table[handler->minor >> 5]) { |
1719 | retval = -EBUSY; | |
1720 | goto out; | |
1721 | } | |
1da177e4 | 1722 | input_table[handler->minor >> 5] = handler; |
4263cf0f | 1723 | } |
1da177e4 LT |
1724 | |
1725 | list_add_tail(&handler->node, &input_handler_list); | |
1726 | ||
1727 | list_for_each_entry(dev, &input_dev_list, node) | |
5b2a0826 | 1728 | input_attach_handler(dev, handler); |
1da177e4 | 1729 | |
f96b434d | 1730 | input_wakeup_procfs_readers(); |
8006479c DT |
1731 | |
1732 | out: | |
1733 | mutex_unlock(&input_mutex); | |
1734 | return retval; | |
1da177e4 | 1735 | } |
ca56fe07 | 1736 | EXPORT_SYMBOL(input_register_handler); |
1da177e4 | 1737 | |
8006479c DT |
1738 | /** |
1739 | * input_unregister_handler - unregisters an input handler | |
1740 | * @handler: handler to be unregistered | |
1741 | * | |
1742 | * This function disconnects a handler from its input devices and | |
1743 | * removes it from lists of known handlers. | |
1744 | */ | |
1da177e4 LT |
1745 | void input_unregister_handler(struct input_handler *handler) |
1746 | { | |
5b2a0826 | 1747 | struct input_handle *handle, *next; |
1da177e4 | 1748 | |
8006479c DT |
1749 | mutex_lock(&input_mutex); |
1750 | ||
5b2a0826 | 1751 | list_for_each_entry_safe(handle, next, &handler->h_list, h_node) |
1da177e4 | 1752 | handler->disconnect(handle); |
5b2a0826 | 1753 | WARN_ON(!list_empty(&handler->h_list)); |
1da177e4 LT |
1754 | |
1755 | list_del_init(&handler->node); | |
1756 | ||
1757 | if (handler->fops != NULL) | |
1758 | input_table[handler->minor >> 5] = NULL; | |
1759 | ||
f96b434d | 1760 | input_wakeup_procfs_readers(); |
8006479c DT |
1761 | |
1762 | mutex_unlock(&input_mutex); | |
1da177e4 | 1763 | } |
ca56fe07 | 1764 | EXPORT_SYMBOL(input_unregister_handler); |
1da177e4 | 1765 | |
66d2a595 DT |
1766 | /** |
1767 | * input_handler_for_each_handle - handle iterator | |
1768 | * @handler: input handler to iterate | |
1769 | * @data: data for the callback | |
1770 | * @fn: function to be called for each handle | |
1771 | * | |
1772 | * Iterate over @bus's list of devices, and call @fn for each, passing | |
1773 | * it @data and stop when @fn returns a non-zero value. The function is | |
1774 | * using RCU to traverse the list and therefore may be usind in atonic | |
1775 | * contexts. The @fn callback is invoked from RCU critical section and | |
1776 | * thus must not sleep. | |
1777 | */ | |
1778 | int input_handler_for_each_handle(struct input_handler *handler, void *data, | |
1779 | int (*fn)(struct input_handle *, void *)) | |
1780 | { | |
1781 | struct input_handle *handle; | |
1782 | int retval = 0; | |
1783 | ||
1784 | rcu_read_lock(); | |
1785 | ||
1786 | list_for_each_entry_rcu(handle, &handler->h_list, h_node) { | |
1787 | retval = fn(handle, data); | |
1788 | if (retval) | |
1789 | break; | |
1790 | } | |
1791 | ||
1792 | rcu_read_unlock(); | |
1793 | ||
1794 | return retval; | |
1795 | } | |
1796 | EXPORT_SYMBOL(input_handler_for_each_handle); | |
1797 | ||
8006479c DT |
1798 | /** |
1799 | * input_register_handle - register a new input handle | |
1800 | * @handle: handle to register | |
1801 | * | |
1802 | * This function puts a new input handle onto device's | |
1803 | * and handler's lists so that events can flow through | |
1804 | * it once it is opened using input_open_device(). | |
1805 | * | |
1806 | * This function is supposed to be called from handler's | |
1807 | * connect() method. | |
1808 | */ | |
5b2a0826 DT |
1809 | int input_register_handle(struct input_handle *handle) |
1810 | { | |
1811 | struct input_handler *handler = handle->handler; | |
8006479c DT |
1812 | struct input_dev *dev = handle->dev; |
1813 | int error; | |
1814 | ||
1815 | /* | |
1816 | * We take dev->mutex here to prevent race with | |
1817 | * input_release_device(). | |
1818 | */ | |
1819 | error = mutex_lock_interruptible(&dev->mutex); | |
1820 | if (error) | |
1821 | return error; | |
ef7995f4 DT |
1822 | |
1823 | /* | |
1824 | * Filters go to the head of the list, normal handlers | |
1825 | * to the tail. | |
1826 | */ | |
1827 | if (handler->filter) | |
1828 | list_add_rcu(&handle->d_node, &dev->h_list); | |
1829 | else | |
1830 | list_add_tail_rcu(&handle->d_node, &dev->h_list); | |
1831 | ||
8006479c | 1832 | mutex_unlock(&dev->mutex); |
5b2a0826 | 1833 | |
8006479c DT |
1834 | /* |
1835 | * Since we are supposed to be called from ->connect() | |
1836 | * which is mutually exclusive with ->disconnect() | |
1837 | * we can't be racing with input_unregister_handle() | |
1838 | * and so separate lock is not needed here. | |
1839 | */ | |
66d2a595 | 1840 | list_add_tail_rcu(&handle->h_node, &handler->h_list); |
5b2a0826 DT |
1841 | |
1842 | if (handler->start) | |
1843 | handler->start(handle); | |
1844 | ||
1845 | return 0; | |
1846 | } | |
1847 | EXPORT_SYMBOL(input_register_handle); | |
1848 | ||
8006479c DT |
1849 | /** |
1850 | * input_unregister_handle - unregister an input handle | |
1851 | * @handle: handle to unregister | |
1852 | * | |
1853 | * This function removes input handle from device's | |
1854 | * and handler's lists. | |
1855 | * | |
1856 | * This function is supposed to be called from handler's | |
1857 | * disconnect() method. | |
1858 | */ | |
5b2a0826 DT |
1859 | void input_unregister_handle(struct input_handle *handle) |
1860 | { | |
8006479c DT |
1861 | struct input_dev *dev = handle->dev; |
1862 | ||
66d2a595 | 1863 | list_del_rcu(&handle->h_node); |
8006479c DT |
1864 | |
1865 | /* | |
1866 | * Take dev->mutex to prevent race with input_release_device(). | |
1867 | */ | |
1868 | mutex_lock(&dev->mutex); | |
1869 | list_del_rcu(&handle->d_node); | |
1870 | mutex_unlock(&dev->mutex); | |
66d2a595 | 1871 | |
82ba56c2 | 1872 | synchronize_rcu(); |
5b2a0826 DT |
1873 | } |
1874 | EXPORT_SYMBOL(input_unregister_handle); | |
1875 | ||
1da177e4 LT |
1876 | static int input_open_file(struct inode *inode, struct file *file) |
1877 | { | |
2edbf853 | 1878 | struct input_handler *handler; |
99ac48f5 | 1879 | const struct file_operations *old_fops, *new_fops = NULL; |
1da177e4 LT |
1880 | int err; |
1881 | ||
2edbf853 | 1882 | lock_kernel(); |
1da177e4 | 1883 | /* No load-on-demand here? */ |
2edbf853 JC |
1884 | handler = input_table[iminor(inode) >> 5]; |
1885 | if (!handler || !(new_fops = fops_get(handler->fops))) { | |
1886 | err = -ENODEV; | |
1887 | goto out; | |
1888 | } | |
1da177e4 LT |
1889 | |
1890 | /* | |
1891 | * That's _really_ odd. Usually NULL ->open means "nothing special", | |
1892 | * not "no device". Oh, well... | |
1893 | */ | |
1894 | if (!new_fops->open) { | |
1895 | fops_put(new_fops); | |
2edbf853 JC |
1896 | err = -ENODEV; |
1897 | goto out; | |
1da177e4 LT |
1898 | } |
1899 | old_fops = file->f_op; | |
1900 | file->f_op = new_fops; | |
1901 | ||
1902 | err = new_fops->open(inode, file); | |
1903 | ||
1904 | if (err) { | |
1905 | fops_put(file->f_op); | |
1906 | file->f_op = fops_get(old_fops); | |
1907 | } | |
1908 | fops_put(old_fops); | |
2edbf853 JC |
1909 | out: |
1910 | unlock_kernel(); | |
1da177e4 LT |
1911 | return err; |
1912 | } | |
1913 | ||
2b8693c0 | 1914 | static const struct file_operations input_fops = { |
1da177e4 LT |
1915 | .owner = THIS_MODULE, |
1916 | .open = input_open_file, | |
1917 | }; | |
1918 | ||
61994a61 HR |
1919 | static void __init input_init_abs_bypass(void) |
1920 | { | |
1921 | const unsigned int *p; | |
1922 | ||
1923 | for (p = input_abs_bypass_init_data; *p; p++) | |
1924 | input_abs_bypass[BIT_WORD(*p)] |= BIT_MASK(*p); | |
1925 | } | |
1926 | ||
f96b434d | 1927 | static int __init input_init(void) |
1da177e4 | 1928 | { |
f96b434d | 1929 | int err; |
1da177e4 | 1930 | |
61994a61 HR |
1931 | input_init_abs_bypass(); |
1932 | ||
ea9f240b | 1933 | err = class_register(&input_class); |
d19fbe8a DT |
1934 | if (err) { |
1935 | printk(KERN_ERR "input: unable to register input_dev class\n"); | |
1936 | return err; | |
1937 | } | |
1938 | ||
f96b434d DT |
1939 | err = input_proc_init(); |
1940 | if (err) | |
b0fdfebb | 1941 | goto fail1; |
1da177e4 | 1942 | |
f96b434d DT |
1943 | err = register_chrdev(INPUT_MAJOR, "input", &input_fops); |
1944 | if (err) { | |
1945 | printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR); | |
b0fdfebb | 1946 | goto fail2; |
1da177e4 | 1947 | } |
e334016f | 1948 | |
1da177e4 | 1949 | return 0; |
1da177e4 | 1950 | |
b0fdfebb | 1951 | fail2: input_proc_exit(); |
ea9f240b | 1952 | fail1: class_unregister(&input_class); |
f96b434d | 1953 | return err; |
1da177e4 LT |
1954 | } |
1955 | ||
1956 | static void __exit input_exit(void) | |
1957 | { | |
f96b434d | 1958 | input_proc_exit(); |
1da177e4 | 1959 | unregister_chrdev(INPUT_MAJOR, "input"); |
ea9f240b | 1960 | class_unregister(&input_class); |
1da177e4 LT |
1961 | } |
1962 | ||
1963 | subsys_initcall(input_init); | |
1964 | module_exit(input_exit); |