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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * The input core | |
3 | * | |
4 | * Copyright (c) 1999-2002 Vojtech Pavlik | |
5 | */ | |
6 | ||
7 | /* | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License version 2 as published by | |
10 | * the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/init.h> | |
ffd0db97 | 14 | #include <linux/types.h> |
1da177e4 LT |
15 | #include <linux/input.h> |
16 | #include <linux/module.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
1da177e4 LT |
18 | #include <linux/random.h> |
19 | #include <linux/major.h> | |
20 | #include <linux/proc_fs.h> | |
a99bbaf5 | 21 | #include <linux/sched.h> |
969b21cd | 22 | #include <linux/seq_file.h> |
1da177e4 LT |
23 | #include <linux/poll.h> |
24 | #include <linux/device.h> | |
e676c232 | 25 | #include <linux/mutex.h> |
8006479c | 26 | #include <linux/rcupdate.h> |
2edbf853 | 27 | #include <linux/smp_lock.h> |
15e184af | 28 | #include "input-compat.h" |
1da177e4 LT |
29 | |
30 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>"); | |
31 | MODULE_DESCRIPTION("Input core"); | |
32 | MODULE_LICENSE("GPL"); | |
33 | ||
1da177e4 LT |
34 | #define INPUT_DEVICES 256 |
35 | ||
61994a61 HR |
36 | /* |
37 | * EV_ABS events which should not be cached are listed here. | |
38 | */ | |
39 | static unsigned int input_abs_bypass_init_data[] __initdata = { | |
5e5ee686 HR |
40 | ABS_MT_TOUCH_MAJOR, |
41 | ABS_MT_TOUCH_MINOR, | |
42 | ABS_MT_WIDTH_MAJOR, | |
43 | ABS_MT_WIDTH_MINOR, | |
44 | ABS_MT_ORIENTATION, | |
45 | ABS_MT_POSITION_X, | |
46 | ABS_MT_POSITION_Y, | |
47 | ABS_MT_TOOL_TYPE, | |
48 | ABS_MT_BLOB_ID, | |
df391e0e | 49 | ABS_MT_TRACKING_ID, |
cb6ecf6f | 50 | ABS_MT_PRESSURE, |
61994a61 HR |
51 | 0 |
52 | }; | |
53 | static unsigned long input_abs_bypass[BITS_TO_LONGS(ABS_CNT)]; | |
54 | ||
1da177e4 LT |
55 | static LIST_HEAD(input_dev_list); |
56 | static LIST_HEAD(input_handler_list); | |
57 | ||
8006479c DT |
58 | /* |
59 | * input_mutex protects access to both input_dev_list and input_handler_list. | |
60 | * This also causes input_[un]register_device and input_[un]register_handler | |
61 | * be mutually exclusive which simplifies locking in drivers implementing | |
62 | * input handlers. | |
63 | */ | |
64 | static DEFINE_MUTEX(input_mutex); | |
65 | ||
1da177e4 LT |
66 | static struct input_handler *input_table[8]; |
67 | ||
8006479c DT |
68 | static inline int is_event_supported(unsigned int code, |
69 | unsigned long *bm, unsigned int max) | |
1da177e4 | 70 | { |
8006479c DT |
71 | return code <= max && test_bit(code, bm); |
72 | } | |
1da177e4 | 73 | |
8006479c DT |
74 | static int input_defuzz_abs_event(int value, int old_val, int fuzz) |
75 | { | |
76 | if (fuzz) { | |
77 | if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2) | |
78 | return old_val; | |
1da177e4 | 79 | |
8006479c DT |
80 | if (value > old_val - fuzz && value < old_val + fuzz) |
81 | return (old_val * 3 + value) / 4; | |
1da177e4 | 82 | |
8006479c DT |
83 | if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2) |
84 | return (old_val + value) / 2; | |
85 | } | |
1da177e4 | 86 | |
8006479c DT |
87 | return value; |
88 | } | |
1da177e4 | 89 | |
8006479c | 90 | /* |
ef7995f4 DT |
91 | * Pass event first through all filters and then, if event has not been |
92 | * filtered out, through all open handles. This function is called with | |
82ba56c2 | 93 | * dev->event_lock held and interrupts disabled. |
8006479c DT |
94 | */ |
95 | static void input_pass_event(struct input_dev *dev, | |
96 | unsigned int type, unsigned int code, int value) | |
97 | { | |
ef7995f4 | 98 | struct input_handler *handler; |
82ba56c2 DT |
99 | struct input_handle *handle; |
100 | ||
101 | rcu_read_lock(); | |
1da177e4 | 102 | |
82ba56c2 | 103 | handle = rcu_dereference(dev->grab); |
8006479c DT |
104 | if (handle) |
105 | handle->handler->event(handle, type, code, value); | |
ef7995f4 DT |
106 | else { |
107 | bool filtered = false; | |
108 | ||
109 | list_for_each_entry_rcu(handle, &dev->h_list, d_node) { | |
110 | if (!handle->open) | |
111 | continue; | |
112 | ||
113 | handler = handle->handler; | |
114 | if (!handler->filter) { | |
115 | if (filtered) | |
116 | break; | |
117 | ||
118 | handler->event(handle, type, code, value); | |
119 | ||
120 | } else if (handler->filter(handle, type, code, value)) | |
121 | filtered = true; | |
122 | } | |
123 | } | |
124 | ||
82ba56c2 | 125 | rcu_read_unlock(); |
8006479c | 126 | } |
1da177e4 | 127 | |
8006479c DT |
128 | /* |
129 | * Generate software autorepeat event. Note that we take | |
130 | * dev->event_lock here to avoid racing with input_event | |
131 | * which may cause keys get "stuck". | |
132 | */ | |
133 | static void input_repeat_key(unsigned long data) | |
134 | { | |
135 | struct input_dev *dev = (void *) data; | |
136 | unsigned long flags; | |
1da177e4 | 137 | |
8006479c | 138 | spin_lock_irqsave(&dev->event_lock, flags); |
1da177e4 | 139 | |
8006479c DT |
140 | if (test_bit(dev->repeat_key, dev->key) && |
141 | is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) { | |
1da177e4 | 142 | |
8006479c | 143 | input_pass_event(dev, EV_KEY, dev->repeat_key, 2); |
1da177e4 | 144 | |
8006479c DT |
145 | if (dev->sync) { |
146 | /* | |
147 | * Only send SYN_REPORT if we are not in a middle | |
148 | * of driver parsing a new hardware packet. | |
149 | * Otherwise assume that the driver will send | |
150 | * SYN_REPORT once it's done. | |
151 | */ | |
152 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
153 | } | |
31581066 | 154 | |
8006479c DT |
155 | if (dev->rep[REP_PERIOD]) |
156 | mod_timer(&dev->timer, jiffies + | |
157 | msecs_to_jiffies(dev->rep[REP_PERIOD])); | |
158 | } | |
31581066 | 159 | |
8006479c DT |
160 | spin_unlock_irqrestore(&dev->event_lock, flags); |
161 | } | |
31581066 | 162 | |
8006479c DT |
163 | static void input_start_autorepeat(struct input_dev *dev, int code) |
164 | { | |
165 | if (test_bit(EV_REP, dev->evbit) && | |
166 | dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && | |
167 | dev->timer.data) { | |
168 | dev->repeat_key = code; | |
169 | mod_timer(&dev->timer, | |
170 | jiffies + msecs_to_jiffies(dev->rep[REP_DELAY])); | |
171 | } | |
172 | } | |
31581066 | 173 | |
e7b5c1ef JB |
174 | static void input_stop_autorepeat(struct input_dev *dev) |
175 | { | |
176 | del_timer(&dev->timer); | |
177 | } | |
178 | ||
8006479c DT |
179 | #define INPUT_IGNORE_EVENT 0 |
180 | #define INPUT_PASS_TO_HANDLERS 1 | |
181 | #define INPUT_PASS_TO_DEVICE 2 | |
182 | #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE) | |
1da177e4 | 183 | |
8006479c DT |
184 | static void input_handle_event(struct input_dev *dev, |
185 | unsigned int type, unsigned int code, int value) | |
186 | { | |
187 | int disposition = INPUT_IGNORE_EVENT; | |
1da177e4 | 188 | |
8006479c | 189 | switch (type) { |
1da177e4 | 190 | |
8006479c DT |
191 | case EV_SYN: |
192 | switch (code) { | |
193 | case SYN_CONFIG: | |
194 | disposition = INPUT_PASS_TO_ALL; | |
195 | break; | |
1da177e4 | 196 | |
8006479c DT |
197 | case SYN_REPORT: |
198 | if (!dev->sync) { | |
199 | dev->sync = 1; | |
200 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 201 | } |
1da177e4 | 202 | break; |
5e5ee686 HR |
203 | case SYN_MT_REPORT: |
204 | dev->sync = 0; | |
205 | disposition = INPUT_PASS_TO_HANDLERS; | |
206 | break; | |
8006479c DT |
207 | } |
208 | break; | |
1da177e4 | 209 | |
8006479c DT |
210 | case EV_KEY: |
211 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
212 | !!test_bit(code, dev->key) != value) { | |
1da177e4 | 213 | |
8006479c DT |
214 | if (value != 2) { |
215 | __change_bit(code, dev->key); | |
216 | if (value) | |
217 | input_start_autorepeat(dev, code); | |
e7b5c1ef JB |
218 | else |
219 | input_stop_autorepeat(dev); | |
8006479c | 220 | } |
1da177e4 | 221 | |
8006479c DT |
222 | disposition = INPUT_PASS_TO_HANDLERS; |
223 | } | |
224 | break; | |
1da177e4 | 225 | |
8006479c DT |
226 | case EV_SW: |
227 | if (is_event_supported(code, dev->swbit, SW_MAX) && | |
228 | !!test_bit(code, dev->sw) != value) { | |
1da177e4 | 229 | |
8006479c DT |
230 | __change_bit(code, dev->sw); |
231 | disposition = INPUT_PASS_TO_HANDLERS; | |
232 | } | |
233 | break; | |
1da177e4 | 234 | |
8006479c DT |
235 | case EV_ABS: |
236 | if (is_event_supported(code, dev->absbit, ABS_MAX)) { | |
1da177e4 | 237 | |
61994a61 HR |
238 | if (test_bit(code, input_abs_bypass)) { |
239 | disposition = INPUT_PASS_TO_HANDLERS; | |
240 | break; | |
241 | } | |
242 | ||
8006479c DT |
243 | value = input_defuzz_abs_event(value, |
244 | dev->abs[code], dev->absfuzz[code]); | |
1da177e4 | 245 | |
8006479c DT |
246 | if (dev->abs[code] != value) { |
247 | dev->abs[code] = value; | |
248 | disposition = INPUT_PASS_TO_HANDLERS; | |
249 | } | |
250 | } | |
251 | break; | |
1da177e4 | 252 | |
8006479c DT |
253 | case EV_REL: |
254 | if (is_event_supported(code, dev->relbit, REL_MAX) && value) | |
255 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 256 | |
8006479c | 257 | break; |
1e0afb28 | 258 | |
8006479c DT |
259 | case EV_MSC: |
260 | if (is_event_supported(code, dev->mscbit, MSC_MAX)) | |
261 | disposition = INPUT_PASS_TO_ALL; | |
1da177e4 | 262 | |
8006479c | 263 | break; |
1da177e4 | 264 | |
8006479c DT |
265 | case EV_LED: |
266 | if (is_event_supported(code, dev->ledbit, LED_MAX) && | |
267 | !!test_bit(code, dev->led) != value) { | |
1da177e4 | 268 | |
8006479c DT |
269 | __change_bit(code, dev->led); |
270 | disposition = INPUT_PASS_TO_ALL; | |
271 | } | |
272 | break; | |
273 | ||
274 | case EV_SND: | |
275 | if (is_event_supported(code, dev->sndbit, SND_MAX)) { | |
1da177e4 | 276 | |
8fdc1948 | 277 | if (!!test_bit(code, dev->snd) != !!value) |
8006479c DT |
278 | __change_bit(code, dev->snd); |
279 | disposition = INPUT_PASS_TO_ALL; | |
280 | } | |
281 | break; | |
8fdc1948 | 282 | |
8006479c DT |
283 | case EV_REP: |
284 | if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) { | |
285 | dev->rep[code] = value; | |
286 | disposition = INPUT_PASS_TO_ALL; | |
287 | } | |
288 | break; | |
1da177e4 | 289 | |
8006479c DT |
290 | case EV_FF: |
291 | if (value >= 0) | |
292 | disposition = INPUT_PASS_TO_ALL; | |
293 | break; | |
ed2fa4dd RP |
294 | |
295 | case EV_PWR: | |
296 | disposition = INPUT_PASS_TO_ALL; | |
297 | break; | |
8006479c | 298 | } |
1da177e4 | 299 | |
c9812282 | 300 | if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN) |
8006479c | 301 | dev->sync = 0; |
1da177e4 | 302 | |
8006479c DT |
303 | if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event) |
304 | dev->event(dev, type, code, value); | |
1da177e4 | 305 | |
8006479c DT |
306 | if (disposition & INPUT_PASS_TO_HANDLERS) |
307 | input_pass_event(dev, type, code, value); | |
308 | } | |
1da177e4 | 309 | |
8006479c DT |
310 | /** |
311 | * input_event() - report new input event | |
312 | * @dev: device that generated the event | |
313 | * @type: type of the event | |
314 | * @code: event code | |
315 | * @value: value of the event | |
316 | * | |
317 | * This function should be used by drivers implementing various input | |
df2d4637 DT |
318 | * devices to report input events. See also input_inject_event(). |
319 | * | |
320 | * NOTE: input_event() may be safely used right after input device was | |
321 | * allocated with input_allocate_device(), even before it is registered | |
322 | * with input_register_device(), but the event will not reach any of the | |
323 | * input handlers. Such early invocation of input_event() may be used | |
324 | * to 'seed' initial state of a switch or initial position of absolute | |
325 | * axis, etc. | |
8006479c | 326 | */ |
8006479c DT |
327 | void input_event(struct input_dev *dev, |
328 | unsigned int type, unsigned int code, int value) | |
329 | { | |
330 | unsigned long flags; | |
509ca1a9 | 331 | |
8006479c | 332 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
509ca1a9 | 333 | |
8006479c DT |
334 | spin_lock_irqsave(&dev->event_lock, flags); |
335 | add_input_randomness(type, code, value); | |
336 | input_handle_event(dev, type, code, value); | |
337 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1da177e4 | 338 | } |
1da177e4 | 339 | } |
ca56fe07 | 340 | EXPORT_SYMBOL(input_event); |
1da177e4 | 341 | |
0e739d28 DT |
342 | /** |
343 | * input_inject_event() - send input event from input handler | |
344 | * @handle: input handle to send event through | |
345 | * @type: type of the event | |
346 | * @code: event code | |
347 | * @value: value of the event | |
348 | * | |
8006479c DT |
349 | * Similar to input_event() but will ignore event if device is |
350 | * "grabbed" and handle injecting event is not the one that owns | |
351 | * the device. | |
0e739d28 | 352 | */ |
8006479c DT |
353 | void input_inject_event(struct input_handle *handle, |
354 | unsigned int type, unsigned int code, int value) | |
1da177e4 | 355 | { |
8006479c DT |
356 | struct input_dev *dev = handle->dev; |
357 | struct input_handle *grab; | |
358 | unsigned long flags; | |
1da177e4 | 359 | |
8006479c DT |
360 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
361 | spin_lock_irqsave(&dev->event_lock, flags); | |
1da177e4 | 362 | |
82ba56c2 | 363 | rcu_read_lock(); |
8006479c DT |
364 | grab = rcu_dereference(dev->grab); |
365 | if (!grab || grab == handle) | |
366 | input_handle_event(dev, type, code, value); | |
82ba56c2 | 367 | rcu_read_unlock(); |
1da177e4 | 368 | |
8006479c DT |
369 | spin_unlock_irqrestore(&dev->event_lock, flags); |
370 | } | |
1da177e4 | 371 | } |
8006479c | 372 | EXPORT_SYMBOL(input_inject_event); |
1da177e4 | 373 | |
8006479c DT |
374 | /** |
375 | * input_grab_device - grabs device for exclusive use | |
376 | * @handle: input handle that wants to own the device | |
377 | * | |
378 | * When a device is grabbed by an input handle all events generated by | |
379 | * the device are delivered only to this handle. Also events injected | |
380 | * by other input handles are ignored while device is grabbed. | |
381 | */ | |
1da177e4 LT |
382 | int input_grab_device(struct input_handle *handle) |
383 | { | |
8006479c DT |
384 | struct input_dev *dev = handle->dev; |
385 | int retval; | |
1da177e4 | 386 | |
8006479c DT |
387 | retval = mutex_lock_interruptible(&dev->mutex); |
388 | if (retval) | |
389 | return retval; | |
390 | ||
391 | if (dev->grab) { | |
392 | retval = -EBUSY; | |
393 | goto out; | |
394 | } | |
395 | ||
396 | rcu_assign_pointer(dev->grab, handle); | |
82ba56c2 | 397 | synchronize_rcu(); |
8006479c DT |
398 | |
399 | out: | |
400 | mutex_unlock(&dev->mutex); | |
401 | return retval; | |
1da177e4 | 402 | } |
ca56fe07 | 403 | EXPORT_SYMBOL(input_grab_device); |
1da177e4 | 404 | |
8006479c | 405 | static void __input_release_device(struct input_handle *handle) |
1da177e4 | 406 | { |
a2b2ed2c | 407 | struct input_dev *dev = handle->dev; |
c7e8dc6e | 408 | |
a2b2ed2c | 409 | if (dev->grab == handle) { |
8006479c DT |
410 | rcu_assign_pointer(dev->grab, NULL); |
411 | /* Make sure input_pass_event() notices that grab is gone */ | |
82ba56c2 | 412 | synchronize_rcu(); |
a2b2ed2c AM |
413 | |
414 | list_for_each_entry(handle, &dev->h_list, d_node) | |
8006479c | 415 | if (handle->open && handle->handler->start) |
c7e8dc6e DT |
416 | handle->handler->start(handle); |
417 | } | |
1da177e4 | 418 | } |
8006479c DT |
419 | |
420 | /** | |
421 | * input_release_device - release previously grabbed device | |
422 | * @handle: input handle that owns the device | |
423 | * | |
424 | * Releases previously grabbed device so that other input handles can | |
425 | * start receiving input events. Upon release all handlers attached | |
426 | * to the device have their start() method called so they have a change | |
427 | * to synchronize device state with the rest of the system. | |
428 | */ | |
429 | void input_release_device(struct input_handle *handle) | |
430 | { | |
431 | struct input_dev *dev = handle->dev; | |
432 | ||
433 | mutex_lock(&dev->mutex); | |
434 | __input_release_device(handle); | |
435 | mutex_unlock(&dev->mutex); | |
436 | } | |
ca56fe07 | 437 | EXPORT_SYMBOL(input_release_device); |
1da177e4 | 438 | |
8006479c DT |
439 | /** |
440 | * input_open_device - open input device | |
441 | * @handle: handle through which device is being accessed | |
442 | * | |
443 | * This function should be called by input handlers when they | |
444 | * want to start receive events from given input device. | |
445 | */ | |
1da177e4 LT |
446 | int input_open_device(struct input_handle *handle) |
447 | { | |
0fbf87ca | 448 | struct input_dev *dev = handle->dev; |
8006479c | 449 | int retval; |
0fbf87ca | 450 | |
8006479c DT |
451 | retval = mutex_lock_interruptible(&dev->mutex); |
452 | if (retval) | |
453 | return retval; | |
454 | ||
455 | if (dev->going_away) { | |
456 | retval = -ENODEV; | |
457 | goto out; | |
458 | } | |
0fbf87ca | 459 | |
1da177e4 | 460 | handle->open++; |
0fbf87ca DT |
461 | |
462 | if (!dev->users++ && dev->open) | |
8006479c DT |
463 | retval = dev->open(dev); |
464 | ||
465 | if (retval) { | |
466 | dev->users--; | |
467 | if (!--handle->open) { | |
468 | /* | |
469 | * Make sure we are not delivering any more events | |
470 | * through this handle | |
471 | */ | |
82ba56c2 | 472 | synchronize_rcu(); |
8006479c DT |
473 | } |
474 | } | |
0fbf87ca | 475 | |
8006479c | 476 | out: |
e676c232 | 477 | mutex_unlock(&dev->mutex); |
8006479c | 478 | return retval; |
1da177e4 | 479 | } |
ca56fe07 | 480 | EXPORT_SYMBOL(input_open_device); |
1da177e4 | 481 | |
8006479c | 482 | int input_flush_device(struct input_handle *handle, struct file *file) |
1da177e4 | 483 | { |
8006479c DT |
484 | struct input_dev *dev = handle->dev; |
485 | int retval; | |
1da177e4 | 486 | |
8006479c DT |
487 | retval = mutex_lock_interruptible(&dev->mutex); |
488 | if (retval) | |
489 | return retval; | |
490 | ||
491 | if (dev->flush) | |
492 | retval = dev->flush(dev, file); | |
493 | ||
494 | mutex_unlock(&dev->mutex); | |
495 | return retval; | |
1da177e4 | 496 | } |
ca56fe07 | 497 | EXPORT_SYMBOL(input_flush_device); |
1da177e4 | 498 | |
8006479c DT |
499 | /** |
500 | * input_close_device - close input device | |
501 | * @handle: handle through which device is being accessed | |
502 | * | |
503 | * This function should be called by input handlers when they | |
504 | * want to stop receive events from given input device. | |
505 | */ | |
1da177e4 LT |
506 | void input_close_device(struct input_handle *handle) |
507 | { | |
0fbf87ca DT |
508 | struct input_dev *dev = handle->dev; |
509 | ||
e676c232 | 510 | mutex_lock(&dev->mutex); |
0fbf87ca | 511 | |
8006479c DT |
512 | __input_release_device(handle); |
513 | ||
0fbf87ca DT |
514 | if (!--dev->users && dev->close) |
515 | dev->close(dev); | |
8006479c DT |
516 | |
517 | if (!--handle->open) { | |
518 | /* | |
82ba56c2 | 519 | * synchronize_rcu() makes sure that input_pass_event() |
8006479c DT |
520 | * completed and that no more input events are delivered |
521 | * through this handle | |
522 | */ | |
82ba56c2 | 523 | synchronize_rcu(); |
8006479c | 524 | } |
0fbf87ca | 525 | |
e676c232 | 526 | mutex_unlock(&dev->mutex); |
1da177e4 | 527 | } |
ca56fe07 | 528 | EXPORT_SYMBOL(input_close_device); |
1da177e4 | 529 | |
866d7d7b ON |
530 | /* |
531 | * Simulate keyup events for all keys that are marked as pressed. | |
532 | * The function must be called with dev->event_lock held. | |
533 | */ | |
534 | static void input_dev_release_keys(struct input_dev *dev) | |
535 | { | |
536 | int code; | |
537 | ||
538 | if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) { | |
539 | for (code = 0; code <= KEY_MAX; code++) { | |
540 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
541 | __test_and_clear_bit(code, dev->key)) { | |
542 | input_pass_event(dev, EV_KEY, code, 0); | |
543 | } | |
544 | } | |
545 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
546 | } | |
547 | } | |
548 | ||
8006479c DT |
549 | /* |
550 | * Prepare device for unregistering | |
551 | */ | |
552 | static void input_disconnect_device(struct input_dev *dev) | |
553 | { | |
554 | struct input_handle *handle; | |
8006479c DT |
555 | |
556 | /* | |
557 | * Mark device as going away. Note that we take dev->mutex here | |
558 | * not to protect access to dev->going_away but rather to ensure | |
559 | * that there are no threads in the middle of input_open_device() | |
560 | */ | |
561 | mutex_lock(&dev->mutex); | |
ffd0db97 | 562 | dev->going_away = true; |
8006479c DT |
563 | mutex_unlock(&dev->mutex); |
564 | ||
565 | spin_lock_irq(&dev->event_lock); | |
566 | ||
567 | /* | |
568 | * Simulate keyup events for all pressed keys so that handlers | |
569 | * are not left with "stuck" keys. The driver may continue | |
570 | * generate events even after we done here but they will not | |
571 | * reach any handlers. | |
572 | */ | |
866d7d7b | 573 | input_dev_release_keys(dev); |
8006479c DT |
574 | |
575 | list_for_each_entry(handle, &dev->h_list, d_node) | |
576 | handle->open = 0; | |
577 | ||
578 | spin_unlock_irq(&dev->event_lock); | |
579 | } | |
580 | ||
c8e4c772 MR |
581 | static int input_fetch_keycode(struct input_dev *dev, int scancode) |
582 | { | |
583 | switch (dev->keycodesize) { | |
584 | case 1: | |
585 | return ((u8 *)dev->keycode)[scancode]; | |
586 | ||
587 | case 2: | |
588 | return ((u16 *)dev->keycode)[scancode]; | |
589 | ||
590 | default: | |
591 | return ((u32 *)dev->keycode)[scancode]; | |
592 | } | |
593 | } | |
594 | ||
595 | static int input_default_getkeycode(struct input_dev *dev, | |
58b93995 DT |
596 | unsigned int scancode, |
597 | unsigned int *keycode) | |
c8e4c772 MR |
598 | { |
599 | if (!dev->keycodesize) | |
600 | return -EINVAL; | |
601 | ||
f4f37c8e | 602 | if (scancode >= dev->keycodemax) |
c8e4c772 MR |
603 | return -EINVAL; |
604 | ||
605 | *keycode = input_fetch_keycode(dev, scancode); | |
606 | ||
607 | return 0; | |
608 | } | |
609 | ||
610 | static int input_default_setkeycode(struct input_dev *dev, | |
58b93995 DT |
611 | unsigned int scancode, |
612 | unsigned int keycode) | |
c8e4c772 MR |
613 | { |
614 | int old_keycode; | |
615 | int i; | |
616 | ||
f4f37c8e | 617 | if (scancode >= dev->keycodemax) |
c8e4c772 MR |
618 | return -EINVAL; |
619 | ||
620 | if (!dev->keycodesize) | |
621 | return -EINVAL; | |
622 | ||
623 | if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8))) | |
624 | return -EINVAL; | |
625 | ||
626 | switch (dev->keycodesize) { | |
627 | case 1: { | |
628 | u8 *k = (u8 *)dev->keycode; | |
629 | old_keycode = k[scancode]; | |
630 | k[scancode] = keycode; | |
631 | break; | |
632 | } | |
633 | case 2: { | |
634 | u16 *k = (u16 *)dev->keycode; | |
635 | old_keycode = k[scancode]; | |
636 | k[scancode] = keycode; | |
637 | break; | |
638 | } | |
639 | default: { | |
640 | u32 *k = (u32 *)dev->keycode; | |
641 | old_keycode = k[scancode]; | |
642 | k[scancode] = keycode; | |
643 | break; | |
644 | } | |
645 | } | |
646 | ||
4f93df40 DT |
647 | __clear_bit(old_keycode, dev->keybit); |
648 | __set_bit(keycode, dev->keybit); | |
c8e4c772 MR |
649 | |
650 | for (i = 0; i < dev->keycodemax; i++) { | |
651 | if (input_fetch_keycode(dev, i) == old_keycode) { | |
4f93df40 | 652 | __set_bit(old_keycode, dev->keybit); |
c8e4c772 MR |
653 | break; /* Setting the bit twice is useless, so break */ |
654 | } | |
655 | } | |
656 | ||
657 | return 0; | |
658 | } | |
659 | ||
f4f37c8e DT |
660 | /** |
661 | * input_get_keycode - retrieve keycode currently mapped to a given scancode | |
662 | * @dev: input device which keymap is being queried | |
663 | * @scancode: scancode (or its equivalent for device in question) for which | |
664 | * keycode is needed | |
665 | * @keycode: result | |
666 | * | |
667 | * This function should be called by anyone interested in retrieving current | |
668 | * keymap. Presently keyboard and evdev handlers use it. | |
669 | */ | |
58b93995 DT |
670 | int input_get_keycode(struct input_dev *dev, |
671 | unsigned int scancode, unsigned int *keycode) | |
f4f37c8e | 672 | { |
2e2e3b96 DT |
673 | unsigned long flags; |
674 | int retval; | |
675 | ||
676 | spin_lock_irqsave(&dev->event_lock, flags); | |
677 | retval = dev->getkeycode(dev, scancode, keycode); | |
678 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
679 | ||
680 | return retval; | |
f4f37c8e DT |
681 | } |
682 | EXPORT_SYMBOL(input_get_keycode); | |
683 | ||
684 | /** | |
685 | * input_get_keycode - assign new keycode to a given scancode | |
686 | * @dev: input device which keymap is being updated | |
687 | * @scancode: scancode (or its equivalent for device in question) | |
688 | * @keycode: new keycode to be assigned to the scancode | |
689 | * | |
690 | * This function should be called by anyone needing to update current | |
691 | * keymap. Presently keyboard and evdev handlers use it. | |
692 | */ | |
58b93995 DT |
693 | int input_set_keycode(struct input_dev *dev, |
694 | unsigned int scancode, unsigned int keycode) | |
f4f37c8e DT |
695 | { |
696 | unsigned long flags; | |
697 | int old_keycode; | |
698 | int retval; | |
699 | ||
58b93995 | 700 | if (keycode > KEY_MAX) |
f4f37c8e DT |
701 | return -EINVAL; |
702 | ||
703 | spin_lock_irqsave(&dev->event_lock, flags); | |
704 | ||
705 | retval = dev->getkeycode(dev, scancode, &old_keycode); | |
706 | if (retval) | |
707 | goto out; | |
708 | ||
709 | retval = dev->setkeycode(dev, scancode, keycode); | |
710 | if (retval) | |
711 | goto out; | |
712 | ||
4f93df40 DT |
713 | /* Make sure KEY_RESERVED did not get enabled. */ |
714 | __clear_bit(KEY_RESERVED, dev->keybit); | |
715 | ||
f4f37c8e DT |
716 | /* |
717 | * Simulate keyup event if keycode is not present | |
718 | * in the keymap anymore | |
719 | */ | |
720 | if (test_bit(EV_KEY, dev->evbit) && | |
721 | !is_event_supported(old_keycode, dev->keybit, KEY_MAX) && | |
722 | __test_and_clear_bit(old_keycode, dev->key)) { | |
723 | ||
724 | input_pass_event(dev, EV_KEY, old_keycode, 0); | |
725 | if (dev->sync) | |
726 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
727 | } | |
728 | ||
729 | out: | |
730 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
731 | ||
732 | return retval; | |
733 | } | |
734 | EXPORT_SYMBOL(input_set_keycode); | |
c8e4c772 | 735 | |
1da177e4 | 736 | #define MATCH_BIT(bit, max) \ |
7b19ada2 | 737 | for (i = 0; i < BITS_TO_LONGS(max); i++) \ |
1da177e4 LT |
738 | if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \ |
739 | break; \ | |
7b19ada2 | 740 | if (i != BITS_TO_LONGS(max)) \ |
1da177e4 LT |
741 | continue; |
742 | ||
0b7024ac | 743 | static const struct input_device_id *input_match_device(struct input_handler *handler, |
66e66118 | 744 | struct input_dev *dev) |
1da177e4 | 745 | { |
0b7024ac | 746 | const struct input_device_id *id; |
1da177e4 LT |
747 | int i; |
748 | ||
0b7024ac | 749 | for (id = handler->id_table; id->flags || id->driver_info; id++) { |
1da177e4 LT |
750 | |
751 | if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) | |
ddc5d341 | 752 | if (id->bustype != dev->id.bustype) |
1da177e4 LT |
753 | continue; |
754 | ||
755 | if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) | |
ddc5d341 | 756 | if (id->vendor != dev->id.vendor) |
1da177e4 LT |
757 | continue; |
758 | ||
759 | if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) | |
ddc5d341 | 760 | if (id->product != dev->id.product) |
1da177e4 LT |
761 | continue; |
762 | ||
763 | if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) | |
ddc5d341 | 764 | if (id->version != dev->id.version) |
1da177e4 LT |
765 | continue; |
766 | ||
767 | MATCH_BIT(evbit, EV_MAX); | |
768 | MATCH_BIT(keybit, KEY_MAX); | |
769 | MATCH_BIT(relbit, REL_MAX); | |
770 | MATCH_BIT(absbit, ABS_MAX); | |
771 | MATCH_BIT(mscbit, MSC_MAX); | |
772 | MATCH_BIT(ledbit, LED_MAX); | |
773 | MATCH_BIT(sndbit, SND_MAX); | |
774 | MATCH_BIT(ffbit, FF_MAX); | |
ff13f98b | 775 | MATCH_BIT(swbit, SW_MAX); |
1da177e4 | 776 | |
0b7024ac DT |
777 | if (!handler->match || handler->match(handler, dev)) |
778 | return id; | |
1da177e4 LT |
779 | } |
780 | ||
781 | return NULL; | |
782 | } | |
783 | ||
5b2a0826 DT |
784 | static int input_attach_handler(struct input_dev *dev, struct input_handler *handler) |
785 | { | |
786 | const struct input_device_id *id; | |
787 | int error; | |
788 | ||
0b7024ac | 789 | id = input_match_device(handler, dev); |
5b2a0826 DT |
790 | if (!id) |
791 | return -ENODEV; | |
792 | ||
793 | error = handler->connect(handler, dev, id); | |
794 | if (error && error != -ENODEV) | |
795 | printk(KERN_ERR | |
796 | "input: failed to attach handler %s to device %s, " | |
797 | "error: %d\n", | |
9657d75c | 798 | handler->name, kobject_name(&dev->dev.kobj), error); |
5b2a0826 DT |
799 | |
800 | return error; | |
801 | } | |
802 | ||
15e184af DT |
803 | #ifdef CONFIG_COMPAT |
804 | ||
805 | static int input_bits_to_string(char *buf, int buf_size, | |
806 | unsigned long bits, bool skip_empty) | |
807 | { | |
808 | int len = 0; | |
809 | ||
810 | if (INPUT_COMPAT_TEST) { | |
811 | u32 dword = bits >> 32; | |
812 | if (dword || !skip_empty) | |
813 | len += snprintf(buf, buf_size, "%x ", dword); | |
814 | ||
815 | dword = bits & 0xffffffffUL; | |
816 | if (dword || !skip_empty || len) | |
817 | len += snprintf(buf + len, max(buf_size - len, 0), | |
818 | "%x", dword); | |
819 | } else { | |
820 | if (bits || !skip_empty) | |
821 | len += snprintf(buf, buf_size, "%lx", bits); | |
822 | } | |
823 | ||
824 | return len; | |
825 | } | |
826 | ||
827 | #else /* !CONFIG_COMPAT */ | |
828 | ||
829 | static int input_bits_to_string(char *buf, int buf_size, | |
830 | unsigned long bits, bool skip_empty) | |
831 | { | |
832 | return bits || !skip_empty ? | |
833 | snprintf(buf, buf_size, "%lx", bits) : 0; | |
834 | } | |
835 | ||
836 | #endif | |
5b2a0826 | 837 | |
f96b434d DT |
838 | #ifdef CONFIG_PROC_FS |
839 | ||
840 | static struct proc_dir_entry *proc_bus_input_dir; | |
841 | static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); | |
842 | static int input_devices_state; | |
843 | ||
844 | static inline void input_wakeup_procfs_readers(void) | |
845 | { | |
846 | input_devices_state++; | |
847 | wake_up(&input_devices_poll_wait); | |
848 | } | |
849 | ||
969b21cd | 850 | static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait) |
f96b434d | 851 | { |
f96b434d | 852 | poll_wait(file, &input_devices_poll_wait, wait); |
fa886612 DT |
853 | if (file->f_version != input_devices_state) { |
854 | file->f_version = input_devices_state; | |
f96b434d | 855 | return POLLIN | POLLRDNORM; |
fa886612 | 856 | } |
1e0afb28 | 857 | |
f96b434d DT |
858 | return 0; |
859 | } | |
860 | ||
1572ca2a DT |
861 | union input_seq_state { |
862 | struct { | |
863 | unsigned short pos; | |
864 | bool mutex_acquired; | |
865 | }; | |
866 | void *p; | |
867 | }; | |
868 | ||
969b21cd DT |
869 | static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) |
870 | { | |
1572ca2a DT |
871 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
872 | int error; | |
873 | ||
874 | /* We need to fit into seq->private pointer */ | |
875 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
876 | ||
877 | error = mutex_lock_interruptible(&input_mutex); | |
878 | if (error) { | |
879 | state->mutex_acquired = false; | |
880 | return ERR_PTR(error); | |
881 | } | |
882 | ||
883 | state->mutex_acquired = true; | |
f96b434d | 884 | |
ad5d972c | 885 | return seq_list_start(&input_dev_list, *pos); |
969b21cd | 886 | } |
051b2fea | 887 | |
969b21cd DT |
888 | static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
889 | { | |
ad5d972c | 890 | return seq_list_next(v, &input_dev_list, pos); |
969b21cd | 891 | } |
f96b434d | 892 | |
1572ca2a | 893 | static void input_seq_stop(struct seq_file *seq, void *v) |
969b21cd | 894 | { |
1572ca2a DT |
895 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
896 | ||
897 | if (state->mutex_acquired) | |
898 | mutex_unlock(&input_mutex); | |
969b21cd | 899 | } |
f96b434d | 900 | |
969b21cd DT |
901 | static void input_seq_print_bitmap(struct seq_file *seq, const char *name, |
902 | unsigned long *bitmap, int max) | |
903 | { | |
904 | int i; | |
15e184af DT |
905 | bool skip_empty = true; |
906 | char buf[18]; | |
f96b434d | 907 | |
969b21cd | 908 | seq_printf(seq, "B: %s=", name); |
15e184af DT |
909 | |
910 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
911 | if (input_bits_to_string(buf, sizeof(buf), | |
912 | bitmap[i], skip_empty)) { | |
913 | skip_empty = false; | |
914 | seq_printf(seq, "%s%s", buf, i > 0 ? " " : ""); | |
915 | } | |
916 | } | |
917 | ||
918 | /* | |
919 | * If no output was produced print a single 0. | |
920 | */ | |
921 | if (skip_empty) | |
922 | seq_puts(seq, "0"); | |
923 | ||
969b21cd DT |
924 | seq_putc(seq, '\n'); |
925 | } | |
f96b434d | 926 | |
969b21cd DT |
927 | static int input_devices_seq_show(struct seq_file *seq, void *v) |
928 | { | |
929 | struct input_dev *dev = container_of(v, struct input_dev, node); | |
9657d75c | 930 | const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
969b21cd DT |
931 | struct input_handle *handle; |
932 | ||
933 | seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", | |
934 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); | |
935 | ||
936 | seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); | |
937 | seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : ""); | |
938 | seq_printf(seq, "S: Sysfs=%s\n", path ? path : ""); | |
15e03ae8 | 939 | seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : ""); |
969b21cd DT |
940 | seq_printf(seq, "H: Handlers="); |
941 | ||
942 | list_for_each_entry(handle, &dev->h_list, d_node) | |
943 | seq_printf(seq, "%s ", handle->name); | |
944 | seq_putc(seq, '\n'); | |
945 | ||
946 | input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); | |
947 | if (test_bit(EV_KEY, dev->evbit)) | |
948 | input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); | |
949 | if (test_bit(EV_REL, dev->evbit)) | |
950 | input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); | |
951 | if (test_bit(EV_ABS, dev->evbit)) | |
952 | input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); | |
953 | if (test_bit(EV_MSC, dev->evbit)) | |
954 | input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); | |
955 | if (test_bit(EV_LED, dev->evbit)) | |
956 | input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); | |
957 | if (test_bit(EV_SND, dev->evbit)) | |
958 | input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); | |
959 | if (test_bit(EV_FF, dev->evbit)) | |
960 | input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); | |
961 | if (test_bit(EV_SW, dev->evbit)) | |
962 | input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); | |
963 | ||
964 | seq_putc(seq, '\n'); | |
965 | ||
966 | kfree(path); | |
967 | return 0; | |
f96b434d DT |
968 | } |
969 | ||
cec69c37 | 970 | static const struct seq_operations input_devices_seq_ops = { |
969b21cd DT |
971 | .start = input_devices_seq_start, |
972 | .next = input_devices_seq_next, | |
1572ca2a | 973 | .stop = input_seq_stop, |
969b21cd DT |
974 | .show = input_devices_seq_show, |
975 | }; | |
976 | ||
977 | static int input_proc_devices_open(struct inode *inode, struct file *file) | |
f96b434d | 978 | { |
969b21cd DT |
979 | return seq_open(file, &input_devices_seq_ops); |
980 | } | |
981 | ||
2b8693c0 | 982 | static const struct file_operations input_devices_fileops = { |
969b21cd DT |
983 | .owner = THIS_MODULE, |
984 | .open = input_proc_devices_open, | |
985 | .poll = input_proc_devices_poll, | |
986 | .read = seq_read, | |
987 | .llseek = seq_lseek, | |
988 | .release = seq_release, | |
989 | }; | |
990 | ||
991 | static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) | |
992 | { | |
1572ca2a DT |
993 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
994 | int error; | |
995 | ||
996 | /* We need to fit into seq->private pointer */ | |
997 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
998 | ||
999 | error = mutex_lock_interruptible(&input_mutex); | |
1000 | if (error) { | |
1001 | state->mutex_acquired = false; | |
1002 | return ERR_PTR(error); | |
1003 | } | |
1004 | ||
1005 | state->mutex_acquired = true; | |
1006 | state->pos = *pos; | |
8006479c | 1007 | |
ad5d972c | 1008 | return seq_list_start(&input_handler_list, *pos); |
969b21cd | 1009 | } |
f96b434d | 1010 | |
969b21cd DT |
1011 | static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1012 | { | |
1572ca2a | 1013 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
f96b434d | 1014 | |
1572ca2a DT |
1015 | state->pos = *pos + 1; |
1016 | return seq_list_next(v, &input_handler_list, pos); | |
969b21cd DT |
1017 | } |
1018 | ||
1019 | static int input_handlers_seq_show(struct seq_file *seq, void *v) | |
1020 | { | |
1021 | struct input_handler *handler = container_of(v, struct input_handler, node); | |
1572ca2a | 1022 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
969b21cd | 1023 | |
1572ca2a | 1024 | seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name); |
ef7995f4 DT |
1025 | if (handler->filter) |
1026 | seq_puts(seq, " (filter)"); | |
969b21cd DT |
1027 | if (handler->fops) |
1028 | seq_printf(seq, " Minor=%d", handler->minor); | |
1029 | seq_putc(seq, '\n'); | |
1030 | ||
1031 | return 0; | |
1032 | } | |
1572ca2a | 1033 | |
cec69c37 | 1034 | static const struct seq_operations input_handlers_seq_ops = { |
969b21cd DT |
1035 | .start = input_handlers_seq_start, |
1036 | .next = input_handlers_seq_next, | |
1572ca2a | 1037 | .stop = input_seq_stop, |
969b21cd DT |
1038 | .show = input_handlers_seq_show, |
1039 | }; | |
1040 | ||
1041 | static int input_proc_handlers_open(struct inode *inode, struct file *file) | |
1042 | { | |
1043 | return seq_open(file, &input_handlers_seq_ops); | |
1044 | } | |
1045 | ||
2b8693c0 | 1046 | static const struct file_operations input_handlers_fileops = { |
969b21cd DT |
1047 | .owner = THIS_MODULE, |
1048 | .open = input_proc_handlers_open, | |
1049 | .read = seq_read, | |
1050 | .llseek = seq_lseek, | |
1051 | .release = seq_release, | |
1052 | }; | |
f96b434d DT |
1053 | |
1054 | static int __init input_proc_init(void) | |
1055 | { | |
1056 | struct proc_dir_entry *entry; | |
1057 | ||
9c37066d | 1058 | proc_bus_input_dir = proc_mkdir("bus/input", NULL); |
f96b434d DT |
1059 | if (!proc_bus_input_dir) |
1060 | return -ENOMEM; | |
1061 | ||
c7705f34 DL |
1062 | entry = proc_create("devices", 0, proc_bus_input_dir, |
1063 | &input_devices_fileops); | |
f96b434d DT |
1064 | if (!entry) |
1065 | goto fail1; | |
1066 | ||
c7705f34 DL |
1067 | entry = proc_create("handlers", 0, proc_bus_input_dir, |
1068 | &input_handlers_fileops); | |
f96b434d DT |
1069 | if (!entry) |
1070 | goto fail2; | |
1071 | ||
f96b434d DT |
1072 | return 0; |
1073 | ||
1074 | fail2: remove_proc_entry("devices", proc_bus_input_dir); | |
9c37066d | 1075 | fail1: remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1076 | return -ENOMEM; |
1077 | } | |
1078 | ||
beffbdc2 | 1079 | static void input_proc_exit(void) |
f96b434d DT |
1080 | { |
1081 | remove_proc_entry("devices", proc_bus_input_dir); | |
1082 | remove_proc_entry("handlers", proc_bus_input_dir); | |
9c37066d | 1083 | remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1084 | } |
1085 | ||
1086 | #else /* !CONFIG_PROC_FS */ | |
1087 | static inline void input_wakeup_procfs_readers(void) { } | |
1088 | static inline int input_proc_init(void) { return 0; } | |
1089 | static inline void input_proc_exit(void) { } | |
1090 | #endif | |
1091 | ||
9657d75c DT |
1092 | #define INPUT_DEV_STRING_ATTR_SHOW(name) \ |
1093 | static ssize_t input_dev_show_##name(struct device *dev, \ | |
1094 | struct device_attribute *attr, \ | |
1095 | char *buf) \ | |
1096 | { \ | |
1097 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1098 | \ | |
1099 | return scnprintf(buf, PAGE_SIZE, "%s\n", \ | |
1100 | input_dev->name ? input_dev->name : ""); \ | |
1101 | } \ | |
1102 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL) | |
5c1e9a6a DT |
1103 | |
1104 | INPUT_DEV_STRING_ATTR_SHOW(name); | |
1105 | INPUT_DEV_STRING_ATTR_SHOW(phys); | |
1106 | INPUT_DEV_STRING_ATTR_SHOW(uniq); | |
1107 | ||
ac648a6a DT |
1108 | static int input_print_modalias_bits(char *buf, int size, |
1109 | char name, unsigned long *bm, | |
1110 | unsigned int min_bit, unsigned int max_bit) | |
1d8f430c | 1111 | { |
ac648a6a | 1112 | int len = 0, i; |
1d8f430c | 1113 | |
ac648a6a DT |
1114 | len += snprintf(buf, max(size, 0), "%c", name); |
1115 | for (i = min_bit; i < max_bit; i++) | |
7b19ada2 | 1116 | if (bm[BIT_WORD(i)] & BIT_MASK(i)) |
ac648a6a | 1117 | len += snprintf(buf + len, max(size - len, 0), "%X,", i); |
1d8f430c RR |
1118 | return len; |
1119 | } | |
1120 | ||
2db66876 DT |
1121 | static int input_print_modalias(char *buf, int size, struct input_dev *id, |
1122 | int add_cr) | |
1d8f430c | 1123 | { |
bd37e5a9 | 1124 | int len; |
1d8f430c | 1125 | |
ac648a6a DT |
1126 | len = snprintf(buf, max(size, 0), |
1127 | "input:b%04Xv%04Xp%04Xe%04X-", | |
1128 | id->id.bustype, id->id.vendor, | |
1129 | id->id.product, id->id.version); | |
1130 | ||
1131 | len += input_print_modalias_bits(buf + len, size - len, | |
1132 | 'e', id->evbit, 0, EV_MAX); | |
1133 | len += input_print_modalias_bits(buf + len, size - len, | |
1134 | 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); | |
1135 | len += input_print_modalias_bits(buf + len, size - len, | |
1136 | 'r', id->relbit, 0, REL_MAX); | |
1137 | len += input_print_modalias_bits(buf + len, size - len, | |
1138 | 'a', id->absbit, 0, ABS_MAX); | |
1139 | len += input_print_modalias_bits(buf + len, size - len, | |
1140 | 'm', id->mscbit, 0, MSC_MAX); | |
1141 | len += input_print_modalias_bits(buf + len, size - len, | |
1142 | 'l', id->ledbit, 0, LED_MAX); | |
1143 | len += input_print_modalias_bits(buf + len, size - len, | |
1144 | 's', id->sndbit, 0, SND_MAX); | |
1145 | len += input_print_modalias_bits(buf + len, size - len, | |
1146 | 'f', id->ffbit, 0, FF_MAX); | |
1147 | len += input_print_modalias_bits(buf + len, size - len, | |
1148 | 'w', id->swbit, 0, SW_MAX); | |
2db66876 DT |
1149 | |
1150 | if (add_cr) | |
ac648a6a | 1151 | len += snprintf(buf + len, max(size - len, 0), "\n"); |
2db66876 | 1152 | |
bd37e5a9 KS |
1153 | return len; |
1154 | } | |
1155 | ||
9657d75c DT |
1156 | static ssize_t input_dev_show_modalias(struct device *dev, |
1157 | struct device_attribute *attr, | |
1158 | char *buf) | |
bd37e5a9 KS |
1159 | { |
1160 | struct input_dev *id = to_input_dev(dev); | |
1161 | ssize_t len; | |
1162 | ||
2db66876 DT |
1163 | len = input_print_modalias(buf, PAGE_SIZE, id, 1); |
1164 | ||
8a3cf456 | 1165 | return min_t(int, len, PAGE_SIZE); |
1d8f430c | 1166 | } |
9657d75c | 1167 | static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); |
1d8f430c | 1168 | |
629b77a4 | 1169 | static struct attribute *input_dev_attrs[] = { |
9657d75c DT |
1170 | &dev_attr_name.attr, |
1171 | &dev_attr_phys.attr, | |
1172 | &dev_attr_uniq.attr, | |
1173 | &dev_attr_modalias.attr, | |
629b77a4 GKH |
1174 | NULL |
1175 | }; | |
1176 | ||
bd0ef235 | 1177 | static struct attribute_group input_dev_attr_group = { |
629b77a4 | 1178 | .attrs = input_dev_attrs, |
5c1e9a6a DT |
1179 | }; |
1180 | ||
9657d75c DT |
1181 | #define INPUT_DEV_ID_ATTR(name) \ |
1182 | static ssize_t input_dev_show_id_##name(struct device *dev, \ | |
1183 | struct device_attribute *attr, \ | |
1184 | char *buf) \ | |
1185 | { \ | |
1186 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1187 | return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \ | |
1188 | } \ | |
1189 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL) | |
5c1e9a6a DT |
1190 | |
1191 | INPUT_DEV_ID_ATTR(bustype); | |
1192 | INPUT_DEV_ID_ATTR(vendor); | |
1193 | INPUT_DEV_ID_ATTR(product); | |
1194 | INPUT_DEV_ID_ATTR(version); | |
1195 | ||
1196 | static struct attribute *input_dev_id_attrs[] = { | |
9657d75c DT |
1197 | &dev_attr_bustype.attr, |
1198 | &dev_attr_vendor.attr, | |
1199 | &dev_attr_product.attr, | |
1200 | &dev_attr_version.attr, | |
5c1e9a6a DT |
1201 | NULL |
1202 | }; | |
1203 | ||
1204 | static struct attribute_group input_dev_id_attr_group = { | |
1205 | .name = "id", | |
1206 | .attrs = input_dev_id_attrs, | |
1207 | }; | |
1208 | ||
969b21cd DT |
1209 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1210 | int max, int add_cr) | |
1211 | { | |
1212 | int i; | |
1213 | int len = 0; | |
15e184af DT |
1214 | bool skip_empty = true; |
1215 | ||
1216 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
1217 | len += input_bits_to_string(buf + len, max(buf_size - len, 0), | |
1218 | bitmap[i], skip_empty); | |
1219 | if (len) { | |
1220 | skip_empty = false; | |
1221 | if (i > 0) | |
1222 | len += snprintf(buf + len, max(buf_size - len, 0), " "); | |
1223 | } | |
1224 | } | |
969b21cd | 1225 | |
15e184af DT |
1226 | /* |
1227 | * If no output was produced print a single 0. | |
1228 | */ | |
1229 | if (len == 0) | |
1230 | len = snprintf(buf, buf_size, "%d", 0); | |
969b21cd DT |
1231 | |
1232 | if (add_cr) | |
1233 | len += snprintf(buf + len, max(buf_size - len, 0), "\n"); | |
1234 | ||
1235 | return len; | |
1236 | } | |
1237 | ||
9657d75c DT |
1238 | #define INPUT_DEV_CAP_ATTR(ev, bm) \ |
1239 | static ssize_t input_dev_show_cap_##bm(struct device *dev, \ | |
1240 | struct device_attribute *attr, \ | |
1241 | char *buf) \ | |
1242 | { \ | |
1243 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1244 | int len = input_print_bitmap(buf, PAGE_SIZE, \ | |
15e184af DT |
1245 | input_dev->bm##bit, ev##_MAX, \ |
1246 | true); \ | |
9657d75c DT |
1247 | return min_t(int, len, PAGE_SIZE); \ |
1248 | } \ | |
1249 | static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL) | |
5c1e9a6a DT |
1250 | |
1251 | INPUT_DEV_CAP_ATTR(EV, ev); | |
1252 | INPUT_DEV_CAP_ATTR(KEY, key); | |
1253 | INPUT_DEV_CAP_ATTR(REL, rel); | |
1254 | INPUT_DEV_CAP_ATTR(ABS, abs); | |
1255 | INPUT_DEV_CAP_ATTR(MSC, msc); | |
1256 | INPUT_DEV_CAP_ATTR(LED, led); | |
1257 | INPUT_DEV_CAP_ATTR(SND, snd); | |
1258 | INPUT_DEV_CAP_ATTR(FF, ff); | |
1259 | INPUT_DEV_CAP_ATTR(SW, sw); | |
1260 | ||
1261 | static struct attribute *input_dev_caps_attrs[] = { | |
9657d75c DT |
1262 | &dev_attr_ev.attr, |
1263 | &dev_attr_key.attr, | |
1264 | &dev_attr_rel.attr, | |
1265 | &dev_attr_abs.attr, | |
1266 | &dev_attr_msc.attr, | |
1267 | &dev_attr_led.attr, | |
1268 | &dev_attr_snd.attr, | |
1269 | &dev_attr_ff.attr, | |
1270 | &dev_attr_sw.attr, | |
5c1e9a6a DT |
1271 | NULL |
1272 | }; | |
1273 | ||
1274 | static struct attribute_group input_dev_caps_attr_group = { | |
1275 | .name = "capabilities", | |
1276 | .attrs = input_dev_caps_attrs, | |
1277 | }; | |
1278 | ||
a4dbd674 | 1279 | static const struct attribute_group *input_dev_attr_groups[] = { |
cb9def4d DT |
1280 | &input_dev_attr_group, |
1281 | &input_dev_id_attr_group, | |
1282 | &input_dev_caps_attr_group, | |
1283 | NULL | |
1284 | }; | |
1285 | ||
9657d75c | 1286 | static void input_dev_release(struct device *device) |
d19fbe8a | 1287 | { |
9657d75c | 1288 | struct input_dev *dev = to_input_dev(device); |
d19fbe8a | 1289 | |
509ca1a9 | 1290 | input_ff_destroy(dev); |
d19fbe8a | 1291 | kfree(dev); |
509ca1a9 | 1292 | |
d19fbe8a DT |
1293 | module_put(THIS_MODULE); |
1294 | } | |
1295 | ||
a7fadbe1 | 1296 | /* |
312c004d | 1297 | * Input uevent interface - loading event handlers based on |
a7fadbe1 DT |
1298 | * device bitfields. |
1299 | */ | |
7eff2e7a | 1300 | static int input_add_uevent_bm_var(struct kobj_uevent_env *env, |
ac648a6a | 1301 | const char *name, unsigned long *bitmap, int max) |
a7fadbe1 | 1302 | { |
7eff2e7a | 1303 | int len; |
a7fadbe1 | 1304 | |
7eff2e7a | 1305 | if (add_uevent_var(env, "%s=", name)) |
a7fadbe1 DT |
1306 | return -ENOMEM; |
1307 | ||
7eff2e7a KS |
1308 | len = input_print_bitmap(&env->buf[env->buflen - 1], |
1309 | sizeof(env->buf) - env->buflen, | |
15e184af | 1310 | bitmap, max, false); |
7eff2e7a | 1311 | if (len >= (sizeof(env->buf) - env->buflen)) |
a7fadbe1 DT |
1312 | return -ENOMEM; |
1313 | ||
7eff2e7a | 1314 | env->buflen += len; |
a7fadbe1 DT |
1315 | return 0; |
1316 | } | |
1317 | ||
7eff2e7a | 1318 | static int input_add_uevent_modalias_var(struct kobj_uevent_env *env, |
ac648a6a DT |
1319 | struct input_dev *dev) |
1320 | { | |
7eff2e7a | 1321 | int len; |
ac648a6a | 1322 | |
7eff2e7a | 1323 | if (add_uevent_var(env, "MODALIAS=")) |
ac648a6a DT |
1324 | return -ENOMEM; |
1325 | ||
7eff2e7a KS |
1326 | len = input_print_modalias(&env->buf[env->buflen - 1], |
1327 | sizeof(env->buf) - env->buflen, | |
1328 | dev, 0); | |
1329 | if (len >= (sizeof(env->buf) - env->buflen)) | |
ac648a6a DT |
1330 | return -ENOMEM; |
1331 | ||
7eff2e7a | 1332 | env->buflen += len; |
ac648a6a DT |
1333 | return 0; |
1334 | } | |
1335 | ||
a7fadbe1 DT |
1336 | #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \ |
1337 | do { \ | |
7eff2e7a | 1338 | int err = add_uevent_var(env, fmt, val); \ |
a7fadbe1 DT |
1339 | if (err) \ |
1340 | return err; \ | |
1341 | } while (0) | |
1342 | ||
1343 | #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \ | |
1344 | do { \ | |
7eff2e7a | 1345 | int err = input_add_uevent_bm_var(env, name, bm, max); \ |
a7fadbe1 DT |
1346 | if (err) \ |
1347 | return err; \ | |
1348 | } while (0) | |
1349 | ||
ac648a6a DT |
1350 | #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \ |
1351 | do { \ | |
7eff2e7a | 1352 | int err = input_add_uevent_modalias_var(env, dev); \ |
ac648a6a DT |
1353 | if (err) \ |
1354 | return err; \ | |
1355 | } while (0) | |
1356 | ||
7eff2e7a | 1357 | static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env) |
a7fadbe1 | 1358 | { |
9657d75c | 1359 | struct input_dev *dev = to_input_dev(device); |
a7fadbe1 DT |
1360 | |
1361 | INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x", | |
1362 | dev->id.bustype, dev->id.vendor, | |
1363 | dev->id.product, dev->id.version); | |
1364 | if (dev->name) | |
1365 | INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); | |
1366 | if (dev->phys) | |
1367 | INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); | |
08de1f04 | 1368 | if (dev->uniq) |
a7fadbe1 DT |
1369 | INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); |
1370 | ||
1371 | INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX); | |
1372 | if (test_bit(EV_KEY, dev->evbit)) | |
1373 | INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX); | |
1374 | if (test_bit(EV_REL, dev->evbit)) | |
1375 | INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX); | |
1376 | if (test_bit(EV_ABS, dev->evbit)) | |
1377 | INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX); | |
1378 | if (test_bit(EV_MSC, dev->evbit)) | |
1379 | INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX); | |
1380 | if (test_bit(EV_LED, dev->evbit)) | |
1381 | INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX); | |
1382 | if (test_bit(EV_SND, dev->evbit)) | |
1383 | INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX); | |
1384 | if (test_bit(EV_FF, dev->evbit)) | |
1385 | INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX); | |
1386 | if (test_bit(EV_SW, dev->evbit)) | |
1387 | INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); | |
1388 | ||
ac648a6a | 1389 | INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); |
a7fadbe1 DT |
1390 | |
1391 | return 0; | |
1392 | } | |
1393 | ||
3cc96351 DT |
1394 | #define INPUT_DO_TOGGLE(dev, type, bits, on) \ |
1395 | do { \ | |
1396 | int i; \ | |
1397 | bool active; \ | |
1398 | \ | |
1399 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1400 | break; \ | |
1401 | \ | |
1402 | for (i = 0; i < type##_MAX; i++) { \ | |
1403 | if (!test_bit(i, dev->bits##bit)) \ | |
1404 | continue; \ | |
1405 | \ | |
1406 | active = test_bit(i, dev->bits); \ | |
1407 | if (!active && !on) \ | |
1408 | continue; \ | |
1409 | \ | |
1410 | dev->event(dev, EV_##type, i, on ? active : 0); \ | |
1411 | } \ | |
ffd0db97 DT |
1412 | } while (0) |
1413 | ||
1c4115e5 | 1414 | #ifdef CONFIG_PM |
ffd0db97 DT |
1415 | static void input_dev_reset(struct input_dev *dev, bool activate) |
1416 | { | |
1417 | if (!dev->event) | |
1418 | return; | |
1419 | ||
1420 | INPUT_DO_TOGGLE(dev, LED, led, activate); | |
1421 | INPUT_DO_TOGGLE(dev, SND, snd, activate); | |
1422 | ||
1423 | if (activate && test_bit(EV_REP, dev->evbit)) { | |
1424 | dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]); | |
1425 | dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]); | |
1426 | } | |
1427 | } | |
1428 | ||
ffd0db97 DT |
1429 | static int input_dev_suspend(struct device *dev) |
1430 | { | |
1431 | struct input_dev *input_dev = to_input_dev(dev); | |
1432 | ||
1433 | mutex_lock(&input_dev->mutex); | |
1434 | input_dev_reset(input_dev, false); | |
1435 | mutex_unlock(&input_dev->mutex); | |
1436 | ||
1437 | return 0; | |
1438 | } | |
1439 | ||
1440 | static int input_dev_resume(struct device *dev) | |
1441 | { | |
1442 | struct input_dev *input_dev = to_input_dev(dev); | |
1443 | ||
1444 | mutex_lock(&input_dev->mutex); | |
1445 | input_dev_reset(input_dev, true); | |
866d7d7b ON |
1446 | |
1447 | /* | |
1448 | * Keys that have been pressed at suspend time are unlikely | |
1449 | * to be still pressed when we resume. | |
1450 | */ | |
1451 | spin_lock_irq(&input_dev->event_lock); | |
1452 | input_dev_release_keys(input_dev); | |
1453 | spin_unlock_irq(&input_dev->event_lock); | |
1454 | ||
ffd0db97 DT |
1455 | mutex_unlock(&input_dev->mutex); |
1456 | ||
1457 | return 0; | |
1458 | } | |
1459 | ||
1460 | static const struct dev_pm_ops input_dev_pm_ops = { | |
1461 | .suspend = input_dev_suspend, | |
1462 | .resume = input_dev_resume, | |
1463 | .poweroff = input_dev_suspend, | |
1464 | .restore = input_dev_resume, | |
1465 | }; | |
1466 | #endif /* CONFIG_PM */ | |
1467 | ||
9657d75c DT |
1468 | static struct device_type input_dev_type = { |
1469 | .groups = input_dev_attr_groups, | |
1470 | .release = input_dev_release, | |
1471 | .uevent = input_dev_uevent, | |
ffd0db97 DT |
1472 | #ifdef CONFIG_PM |
1473 | .pm = &input_dev_pm_ops, | |
1474 | #endif | |
9657d75c DT |
1475 | }; |
1476 | ||
e454cea2 | 1477 | static char *input_devnode(struct device *dev, mode_t *mode) |
aa5ed63e KS |
1478 | { |
1479 | return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev)); | |
1480 | } | |
1481 | ||
ea9f240b | 1482 | struct class input_class = { |
9657d75c | 1483 | .name = "input", |
e454cea2 | 1484 | .devnode = input_devnode, |
d19fbe8a | 1485 | }; |
ca56fe07 | 1486 | EXPORT_SYMBOL_GPL(input_class); |
d19fbe8a | 1487 | |
1447190e DT |
1488 | /** |
1489 | * input_allocate_device - allocate memory for new input device | |
1490 | * | |
1491 | * Returns prepared struct input_dev or NULL. | |
1492 | * | |
1493 | * NOTE: Use input_free_device() to free devices that have not been | |
1494 | * registered; input_unregister_device() should be used for already | |
1495 | * registered devices. | |
1496 | */ | |
d19fbe8a DT |
1497 | struct input_dev *input_allocate_device(void) |
1498 | { | |
1499 | struct input_dev *dev; | |
1500 | ||
1501 | dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); | |
1502 | if (dev) { | |
9657d75c DT |
1503 | dev->dev.type = &input_dev_type; |
1504 | dev->dev.class = &input_class; | |
1505 | device_initialize(&dev->dev); | |
f60d2b11 | 1506 | mutex_init(&dev->mutex); |
8006479c | 1507 | spin_lock_init(&dev->event_lock); |
d19fbe8a DT |
1508 | INIT_LIST_HEAD(&dev->h_list); |
1509 | INIT_LIST_HEAD(&dev->node); | |
655816e4 DT |
1510 | |
1511 | __module_get(THIS_MODULE); | |
d19fbe8a DT |
1512 | } |
1513 | ||
1514 | return dev; | |
1515 | } | |
ca56fe07 | 1516 | EXPORT_SYMBOL(input_allocate_device); |
d19fbe8a | 1517 | |
1447190e DT |
1518 | /** |
1519 | * input_free_device - free memory occupied by input_dev structure | |
1520 | * @dev: input device to free | |
1521 | * | |
1522 | * This function should only be used if input_register_device() | |
1523 | * was not called yet or if it failed. Once device was registered | |
1524 | * use input_unregister_device() and memory will be freed once last | |
8006479c | 1525 | * reference to the device is dropped. |
1447190e DT |
1526 | * |
1527 | * Device should be allocated by input_allocate_device(). | |
1528 | * | |
1529 | * NOTE: If there are references to the input device then memory | |
1530 | * will not be freed until last reference is dropped. | |
1531 | */ | |
f60d2b11 DT |
1532 | void input_free_device(struct input_dev *dev) |
1533 | { | |
54f9e36c | 1534 | if (dev) |
f60d2b11 | 1535 | input_put_device(dev); |
f60d2b11 | 1536 | } |
ca56fe07 | 1537 | EXPORT_SYMBOL(input_free_device); |
f60d2b11 | 1538 | |
534565f2 DT |
1539 | /** |
1540 | * input_set_capability - mark device as capable of a certain event | |
1541 | * @dev: device that is capable of emitting or accepting event | |
1542 | * @type: type of the event (EV_KEY, EV_REL, etc...) | |
1543 | * @code: event code | |
1544 | * | |
1545 | * In addition to setting up corresponding bit in appropriate capability | |
1546 | * bitmap the function also adjusts dev->evbit. | |
1547 | */ | |
1548 | void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code) | |
1549 | { | |
1550 | switch (type) { | |
1551 | case EV_KEY: | |
1552 | __set_bit(code, dev->keybit); | |
1553 | break; | |
1554 | ||
1555 | case EV_REL: | |
1556 | __set_bit(code, dev->relbit); | |
1557 | break; | |
1558 | ||
1559 | case EV_ABS: | |
1560 | __set_bit(code, dev->absbit); | |
1561 | break; | |
1562 | ||
1563 | case EV_MSC: | |
1564 | __set_bit(code, dev->mscbit); | |
1565 | break; | |
1566 | ||
1567 | case EV_SW: | |
1568 | __set_bit(code, dev->swbit); | |
1569 | break; | |
1570 | ||
1571 | case EV_LED: | |
1572 | __set_bit(code, dev->ledbit); | |
1573 | break; | |
1574 | ||
1575 | case EV_SND: | |
1576 | __set_bit(code, dev->sndbit); | |
1577 | break; | |
1578 | ||
1579 | case EV_FF: | |
1580 | __set_bit(code, dev->ffbit); | |
1581 | break; | |
1582 | ||
22d1c398 DES |
1583 | case EV_PWR: |
1584 | /* do nothing */ | |
1585 | break; | |
1586 | ||
534565f2 DT |
1587 | default: |
1588 | printk(KERN_ERR | |
1589 | "input_set_capability: unknown type %u (code %u)\n", | |
1590 | type, code); | |
1591 | dump_stack(); | |
1592 | return; | |
1593 | } | |
1594 | ||
1595 | __set_bit(type, dev->evbit); | |
1596 | } | |
1597 | EXPORT_SYMBOL(input_set_capability); | |
1598 | ||
92a3a587 DT |
1599 | #define INPUT_CLEANSE_BITMASK(dev, type, bits) \ |
1600 | do { \ | |
1601 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1602 | memset(dev->bits##bit, 0, \ | |
1603 | sizeof(dev->bits##bit)); \ | |
1604 | } while (0) | |
1605 | ||
1606 | static void input_cleanse_bitmasks(struct input_dev *dev) | |
1607 | { | |
1608 | INPUT_CLEANSE_BITMASK(dev, KEY, key); | |
1609 | INPUT_CLEANSE_BITMASK(dev, REL, rel); | |
1610 | INPUT_CLEANSE_BITMASK(dev, ABS, abs); | |
1611 | INPUT_CLEANSE_BITMASK(dev, MSC, msc); | |
1612 | INPUT_CLEANSE_BITMASK(dev, LED, led); | |
1613 | INPUT_CLEANSE_BITMASK(dev, SND, snd); | |
1614 | INPUT_CLEANSE_BITMASK(dev, FF, ff); | |
1615 | INPUT_CLEANSE_BITMASK(dev, SW, sw); | |
1616 | } | |
1617 | ||
8006479c DT |
1618 | /** |
1619 | * input_register_device - register device with input core | |
1620 | * @dev: device to be registered | |
1621 | * | |
1622 | * This function registers device with input core. The device must be | |
1623 | * allocated with input_allocate_device() and all it's capabilities | |
1624 | * set up before registering. | |
1625 | * If function fails the device must be freed with input_free_device(). | |
1626 | * Once device has been successfully registered it can be unregistered | |
1627 | * with input_unregister_device(); input_free_device() should not be | |
1628 | * called in this case. | |
1629 | */ | |
5f945489 | 1630 | int input_register_device(struct input_dev *dev) |
1da177e4 | 1631 | { |
bd0ef235 | 1632 | static atomic_t input_no = ATOMIC_INIT(0); |
1da177e4 | 1633 | struct input_handler *handler; |
bd0ef235 DT |
1634 | const char *path; |
1635 | int error; | |
1da177e4 | 1636 | |
4f93df40 | 1637 | /* Every input device generates EV_SYN/SYN_REPORT events. */ |
8006479c | 1638 | __set_bit(EV_SYN, dev->evbit); |
0fbf87ca | 1639 | |
4f93df40 DT |
1640 | /* KEY_RESERVED is not supposed to be transmitted to userspace. */ |
1641 | __clear_bit(KEY_RESERVED, dev->keybit); | |
1642 | ||
92a3a587 DT |
1643 | /* Make sure that bitmasks not mentioned in dev->evbit are clean. */ |
1644 | input_cleanse_bitmasks(dev); | |
1645 | ||
1da177e4 LT |
1646 | /* |
1647 | * If delay and period are pre-set by the driver, then autorepeating | |
1648 | * is handled by the driver itself and we don't do it in input.c. | |
1649 | */ | |
1da177e4 LT |
1650 | init_timer(&dev->timer); |
1651 | if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { | |
1652 | dev->timer.data = (long) dev; | |
1653 | dev->timer.function = input_repeat_key; | |
1654 | dev->rep[REP_DELAY] = 250; | |
1655 | dev->rep[REP_PERIOD] = 33; | |
1656 | } | |
1657 | ||
c8e4c772 MR |
1658 | if (!dev->getkeycode) |
1659 | dev->getkeycode = input_default_getkeycode; | |
1660 | ||
1661 | if (!dev->setkeycode) | |
1662 | dev->setkeycode = input_default_setkeycode; | |
1663 | ||
a6c2490f KS |
1664 | dev_set_name(&dev->dev, "input%ld", |
1665 | (unsigned long) atomic_inc_return(&input_no) - 1); | |
bd0ef235 | 1666 | |
9657d75c | 1667 | error = device_add(&dev->dev); |
bd0ef235 DT |
1668 | if (error) |
1669 | return error; | |
1670 | ||
9657d75c | 1671 | path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
bd0ef235 DT |
1672 | printk(KERN_INFO "input: %s as %s\n", |
1673 | dev->name ? dev->name : "Unspecified device", path ? path : "N/A"); | |
1674 | kfree(path); | |
10204020 | 1675 | |
8006479c DT |
1676 | error = mutex_lock_interruptible(&input_mutex); |
1677 | if (error) { | |
1678 | device_del(&dev->dev); | |
1679 | return error; | |
1680 | } | |
1681 | ||
1682 | list_add_tail(&dev->node, &input_dev_list); | |
1683 | ||
1da177e4 | 1684 | list_for_each_entry(handler, &input_handler_list, node) |
5b2a0826 | 1685 | input_attach_handler(dev, handler); |
1da177e4 | 1686 | |
f96b434d | 1687 | input_wakeup_procfs_readers(); |
5f945489 | 1688 | |
8006479c DT |
1689 | mutex_unlock(&input_mutex); |
1690 | ||
5f945489 | 1691 | return 0; |
1da177e4 | 1692 | } |
ca56fe07 | 1693 | EXPORT_SYMBOL(input_register_device); |
1da177e4 | 1694 | |
8006479c DT |
1695 | /** |
1696 | * input_unregister_device - unregister previously registered device | |
1697 | * @dev: device to be unregistered | |
1698 | * | |
1699 | * This function unregisters an input device. Once device is unregistered | |
1700 | * the caller should not try to access it as it may get freed at any moment. | |
1701 | */ | |
1da177e4 LT |
1702 | void input_unregister_device(struct input_dev *dev) |
1703 | { | |
5b2a0826 | 1704 | struct input_handle *handle, *next; |
1da177e4 | 1705 | |
8006479c | 1706 | input_disconnect_device(dev); |
1da177e4 | 1707 | |
8006479c | 1708 | mutex_lock(&input_mutex); |
1da177e4 | 1709 | |
5b2a0826 | 1710 | list_for_each_entry_safe(handle, next, &dev->h_list, d_node) |
1da177e4 | 1711 | handle->handler->disconnect(handle); |
5b2a0826 | 1712 | WARN_ON(!list_empty(&dev->h_list)); |
1da177e4 | 1713 | |
8006479c | 1714 | del_timer_sync(&dev->timer); |
1da177e4 LT |
1715 | list_del_init(&dev->node); |
1716 | ||
f96b434d | 1717 | input_wakeup_procfs_readers(); |
8006479c DT |
1718 | |
1719 | mutex_unlock(&input_mutex); | |
1720 | ||
1721 | device_unregister(&dev->dev); | |
1da177e4 | 1722 | } |
ca56fe07 | 1723 | EXPORT_SYMBOL(input_unregister_device); |
1da177e4 | 1724 | |
8006479c DT |
1725 | /** |
1726 | * input_register_handler - register a new input handler | |
1727 | * @handler: handler to be registered | |
1728 | * | |
1729 | * This function registers a new input handler (interface) for input | |
1730 | * devices in the system and attaches it to all input devices that | |
1731 | * are compatible with the handler. | |
1732 | */ | |
4263cf0f | 1733 | int input_register_handler(struct input_handler *handler) |
1da177e4 LT |
1734 | { |
1735 | struct input_dev *dev; | |
8006479c DT |
1736 | int retval; |
1737 | ||
1738 | retval = mutex_lock_interruptible(&input_mutex); | |
1739 | if (retval) | |
1740 | return retval; | |
1da177e4 | 1741 | |
1da177e4 LT |
1742 | INIT_LIST_HEAD(&handler->h_list); |
1743 | ||
4263cf0f | 1744 | if (handler->fops != NULL) { |
8006479c DT |
1745 | if (input_table[handler->minor >> 5]) { |
1746 | retval = -EBUSY; | |
1747 | goto out; | |
1748 | } | |
1da177e4 | 1749 | input_table[handler->minor >> 5] = handler; |
4263cf0f | 1750 | } |
1da177e4 LT |
1751 | |
1752 | list_add_tail(&handler->node, &input_handler_list); | |
1753 | ||
1754 | list_for_each_entry(dev, &input_dev_list, node) | |
5b2a0826 | 1755 | input_attach_handler(dev, handler); |
1da177e4 | 1756 | |
f96b434d | 1757 | input_wakeup_procfs_readers(); |
8006479c DT |
1758 | |
1759 | out: | |
1760 | mutex_unlock(&input_mutex); | |
1761 | return retval; | |
1da177e4 | 1762 | } |
ca56fe07 | 1763 | EXPORT_SYMBOL(input_register_handler); |
1da177e4 | 1764 | |
8006479c DT |
1765 | /** |
1766 | * input_unregister_handler - unregisters an input handler | |
1767 | * @handler: handler to be unregistered | |
1768 | * | |
1769 | * This function disconnects a handler from its input devices and | |
1770 | * removes it from lists of known handlers. | |
1771 | */ | |
1da177e4 LT |
1772 | void input_unregister_handler(struct input_handler *handler) |
1773 | { | |
5b2a0826 | 1774 | struct input_handle *handle, *next; |
1da177e4 | 1775 | |
8006479c DT |
1776 | mutex_lock(&input_mutex); |
1777 | ||
5b2a0826 | 1778 | list_for_each_entry_safe(handle, next, &handler->h_list, h_node) |
1da177e4 | 1779 | handler->disconnect(handle); |
5b2a0826 | 1780 | WARN_ON(!list_empty(&handler->h_list)); |
1da177e4 LT |
1781 | |
1782 | list_del_init(&handler->node); | |
1783 | ||
1784 | if (handler->fops != NULL) | |
1785 | input_table[handler->minor >> 5] = NULL; | |
1786 | ||
f96b434d | 1787 | input_wakeup_procfs_readers(); |
8006479c DT |
1788 | |
1789 | mutex_unlock(&input_mutex); | |
1da177e4 | 1790 | } |
ca56fe07 | 1791 | EXPORT_SYMBOL(input_unregister_handler); |
1da177e4 | 1792 | |
66d2a595 DT |
1793 | /** |
1794 | * input_handler_for_each_handle - handle iterator | |
1795 | * @handler: input handler to iterate | |
1796 | * @data: data for the callback | |
1797 | * @fn: function to be called for each handle | |
1798 | * | |
1799 | * Iterate over @bus's list of devices, and call @fn for each, passing | |
1800 | * it @data and stop when @fn returns a non-zero value. The function is | |
1801 | * using RCU to traverse the list and therefore may be usind in atonic | |
1802 | * contexts. The @fn callback is invoked from RCU critical section and | |
1803 | * thus must not sleep. | |
1804 | */ | |
1805 | int input_handler_for_each_handle(struct input_handler *handler, void *data, | |
1806 | int (*fn)(struct input_handle *, void *)) | |
1807 | { | |
1808 | struct input_handle *handle; | |
1809 | int retval = 0; | |
1810 | ||
1811 | rcu_read_lock(); | |
1812 | ||
1813 | list_for_each_entry_rcu(handle, &handler->h_list, h_node) { | |
1814 | retval = fn(handle, data); | |
1815 | if (retval) | |
1816 | break; | |
1817 | } | |
1818 | ||
1819 | rcu_read_unlock(); | |
1820 | ||
1821 | return retval; | |
1822 | } | |
1823 | EXPORT_SYMBOL(input_handler_for_each_handle); | |
1824 | ||
8006479c DT |
1825 | /** |
1826 | * input_register_handle - register a new input handle | |
1827 | * @handle: handle to register | |
1828 | * | |
1829 | * This function puts a new input handle onto device's | |
1830 | * and handler's lists so that events can flow through | |
1831 | * it once it is opened using input_open_device(). | |
1832 | * | |
1833 | * This function is supposed to be called from handler's | |
1834 | * connect() method. | |
1835 | */ | |
5b2a0826 DT |
1836 | int input_register_handle(struct input_handle *handle) |
1837 | { | |
1838 | struct input_handler *handler = handle->handler; | |
8006479c DT |
1839 | struct input_dev *dev = handle->dev; |
1840 | int error; | |
1841 | ||
1842 | /* | |
1843 | * We take dev->mutex here to prevent race with | |
1844 | * input_release_device(). | |
1845 | */ | |
1846 | error = mutex_lock_interruptible(&dev->mutex); | |
1847 | if (error) | |
1848 | return error; | |
ef7995f4 DT |
1849 | |
1850 | /* | |
1851 | * Filters go to the head of the list, normal handlers | |
1852 | * to the tail. | |
1853 | */ | |
1854 | if (handler->filter) | |
1855 | list_add_rcu(&handle->d_node, &dev->h_list); | |
1856 | else | |
1857 | list_add_tail_rcu(&handle->d_node, &dev->h_list); | |
1858 | ||
8006479c | 1859 | mutex_unlock(&dev->mutex); |
5b2a0826 | 1860 | |
8006479c DT |
1861 | /* |
1862 | * Since we are supposed to be called from ->connect() | |
1863 | * which is mutually exclusive with ->disconnect() | |
1864 | * we can't be racing with input_unregister_handle() | |
1865 | * and so separate lock is not needed here. | |
1866 | */ | |
66d2a595 | 1867 | list_add_tail_rcu(&handle->h_node, &handler->h_list); |
5b2a0826 DT |
1868 | |
1869 | if (handler->start) | |
1870 | handler->start(handle); | |
1871 | ||
1872 | return 0; | |
1873 | } | |
1874 | EXPORT_SYMBOL(input_register_handle); | |
1875 | ||
8006479c DT |
1876 | /** |
1877 | * input_unregister_handle - unregister an input handle | |
1878 | * @handle: handle to unregister | |
1879 | * | |
1880 | * This function removes input handle from device's | |
1881 | * and handler's lists. | |
1882 | * | |
1883 | * This function is supposed to be called from handler's | |
1884 | * disconnect() method. | |
1885 | */ | |
5b2a0826 DT |
1886 | void input_unregister_handle(struct input_handle *handle) |
1887 | { | |
8006479c DT |
1888 | struct input_dev *dev = handle->dev; |
1889 | ||
66d2a595 | 1890 | list_del_rcu(&handle->h_node); |
8006479c DT |
1891 | |
1892 | /* | |
1893 | * Take dev->mutex to prevent race with input_release_device(). | |
1894 | */ | |
1895 | mutex_lock(&dev->mutex); | |
1896 | list_del_rcu(&handle->d_node); | |
1897 | mutex_unlock(&dev->mutex); | |
66d2a595 | 1898 | |
82ba56c2 | 1899 | synchronize_rcu(); |
5b2a0826 DT |
1900 | } |
1901 | EXPORT_SYMBOL(input_unregister_handle); | |
1902 | ||
1da177e4 LT |
1903 | static int input_open_file(struct inode *inode, struct file *file) |
1904 | { | |
2edbf853 | 1905 | struct input_handler *handler; |
99ac48f5 | 1906 | const struct file_operations *old_fops, *new_fops = NULL; |
1da177e4 LT |
1907 | int err; |
1908 | ||
2f2177c8 AB |
1909 | err = mutex_lock_interruptible(&input_mutex); |
1910 | if (err) | |
1911 | return err; | |
1912 | ||
1da177e4 | 1913 | /* No load-on-demand here? */ |
2edbf853 | 1914 | handler = input_table[iminor(inode) >> 5]; |
2f2177c8 AB |
1915 | if (handler) |
1916 | new_fops = fops_get(handler->fops); | |
1917 | ||
1918 | mutex_unlock(&input_mutex); | |
1da177e4 LT |
1919 | |
1920 | /* | |
1921 | * That's _really_ odd. Usually NULL ->open means "nothing special", | |
1922 | * not "no device". Oh, well... | |
1923 | */ | |
2f2177c8 | 1924 | if (!new_fops || !new_fops->open) { |
1da177e4 | 1925 | fops_put(new_fops); |
2edbf853 JC |
1926 | err = -ENODEV; |
1927 | goto out; | |
1da177e4 | 1928 | } |
2f2177c8 | 1929 | |
1da177e4 LT |
1930 | old_fops = file->f_op; |
1931 | file->f_op = new_fops; | |
1932 | ||
1933 | err = new_fops->open(inode, file); | |
1da177e4 LT |
1934 | if (err) { |
1935 | fops_put(file->f_op); | |
1936 | file->f_op = fops_get(old_fops); | |
1937 | } | |
1938 | fops_put(old_fops); | |
2edbf853 | 1939 | out: |
1da177e4 LT |
1940 | return err; |
1941 | } | |
1942 | ||
2b8693c0 | 1943 | static const struct file_operations input_fops = { |
1da177e4 LT |
1944 | .owner = THIS_MODULE, |
1945 | .open = input_open_file, | |
1946 | }; | |
1947 | ||
61994a61 HR |
1948 | static void __init input_init_abs_bypass(void) |
1949 | { | |
1950 | const unsigned int *p; | |
1951 | ||
1952 | for (p = input_abs_bypass_init_data; *p; p++) | |
1953 | input_abs_bypass[BIT_WORD(*p)] |= BIT_MASK(*p); | |
1954 | } | |
1955 | ||
f96b434d | 1956 | static int __init input_init(void) |
1da177e4 | 1957 | { |
f96b434d | 1958 | int err; |
1da177e4 | 1959 | |
61994a61 HR |
1960 | input_init_abs_bypass(); |
1961 | ||
ea9f240b | 1962 | err = class_register(&input_class); |
d19fbe8a DT |
1963 | if (err) { |
1964 | printk(KERN_ERR "input: unable to register input_dev class\n"); | |
1965 | return err; | |
1966 | } | |
1967 | ||
f96b434d DT |
1968 | err = input_proc_init(); |
1969 | if (err) | |
b0fdfebb | 1970 | goto fail1; |
1da177e4 | 1971 | |
f96b434d DT |
1972 | err = register_chrdev(INPUT_MAJOR, "input", &input_fops); |
1973 | if (err) { | |
1974 | printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR); | |
b0fdfebb | 1975 | goto fail2; |
1da177e4 | 1976 | } |
e334016f | 1977 | |
1da177e4 | 1978 | return 0; |
1da177e4 | 1979 | |
b0fdfebb | 1980 | fail2: input_proc_exit(); |
ea9f240b | 1981 | fail1: class_unregister(&input_class); |
f96b434d | 1982 | return err; |
1da177e4 LT |
1983 | } |
1984 | ||
1985 | static void __exit input_exit(void) | |
1986 | { | |
f96b434d | 1987 | input_proc_exit(); |
1da177e4 | 1988 | unregister_chrdev(INPUT_MAJOR, "input"); |
ea9f240b | 1989 | class_unregister(&input_class); |
1da177e4 LT |
1990 | } |
1991 | ||
1992 | subsys_initcall(input_init); | |
1993 | module_exit(input_exit); |