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