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> | |
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 | |
8006479c DT |
530 | /* |
531 | * Prepare device for unregistering | |
532 | */ | |
533 | static void input_disconnect_device(struct input_dev *dev) | |
534 | { | |
535 | struct input_handle *handle; | |
536 | int code; | |
537 | ||
538 | /* | |
539 | * Mark device as going away. Note that we take dev->mutex here | |
540 | * not to protect access to dev->going_away but rather to ensure | |
541 | * that there are no threads in the middle of input_open_device() | |
542 | */ | |
543 | mutex_lock(&dev->mutex); | |
ffd0db97 | 544 | dev->going_away = true; |
8006479c DT |
545 | mutex_unlock(&dev->mutex); |
546 | ||
547 | spin_lock_irq(&dev->event_lock); | |
548 | ||
549 | /* | |
550 | * Simulate keyup events for all pressed keys so that handlers | |
551 | * are not left with "stuck" keys. The driver may continue | |
552 | * generate events even after we done here but they will not | |
553 | * reach any handlers. | |
554 | */ | |
555 | if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) { | |
556 | for (code = 0; code <= KEY_MAX; code++) { | |
557 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
f4f37c8e | 558 | __test_and_clear_bit(code, dev->key)) { |
8006479c DT |
559 | input_pass_event(dev, EV_KEY, code, 0); |
560 | } | |
561 | } | |
562 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
563 | } | |
564 | ||
565 | list_for_each_entry(handle, &dev->h_list, d_node) | |
566 | handle->open = 0; | |
567 | ||
568 | spin_unlock_irq(&dev->event_lock); | |
569 | } | |
570 | ||
c8e4c772 MR |
571 | static int input_fetch_keycode(struct input_dev *dev, int scancode) |
572 | { | |
573 | switch (dev->keycodesize) { | |
574 | case 1: | |
575 | return ((u8 *)dev->keycode)[scancode]; | |
576 | ||
577 | case 2: | |
578 | return ((u16 *)dev->keycode)[scancode]; | |
579 | ||
580 | default: | |
581 | return ((u32 *)dev->keycode)[scancode]; | |
582 | } | |
583 | } | |
584 | ||
585 | static int input_default_getkeycode(struct input_dev *dev, | |
58b93995 DT |
586 | unsigned int scancode, |
587 | unsigned int *keycode) | |
c8e4c772 MR |
588 | { |
589 | if (!dev->keycodesize) | |
590 | return -EINVAL; | |
591 | ||
f4f37c8e | 592 | if (scancode >= dev->keycodemax) |
c8e4c772 MR |
593 | return -EINVAL; |
594 | ||
595 | *keycode = input_fetch_keycode(dev, scancode); | |
596 | ||
597 | return 0; | |
598 | } | |
599 | ||
600 | static int input_default_setkeycode(struct input_dev *dev, | |
58b93995 DT |
601 | unsigned int scancode, |
602 | unsigned int keycode) | |
c8e4c772 MR |
603 | { |
604 | int old_keycode; | |
605 | int i; | |
606 | ||
f4f37c8e | 607 | if (scancode >= dev->keycodemax) |
c8e4c772 MR |
608 | return -EINVAL; |
609 | ||
610 | if (!dev->keycodesize) | |
611 | return -EINVAL; | |
612 | ||
613 | if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8))) | |
614 | return -EINVAL; | |
615 | ||
616 | switch (dev->keycodesize) { | |
617 | case 1: { | |
618 | u8 *k = (u8 *)dev->keycode; | |
619 | old_keycode = k[scancode]; | |
620 | k[scancode] = keycode; | |
621 | break; | |
622 | } | |
623 | case 2: { | |
624 | u16 *k = (u16 *)dev->keycode; | |
625 | old_keycode = k[scancode]; | |
626 | k[scancode] = keycode; | |
627 | break; | |
628 | } | |
629 | default: { | |
630 | u32 *k = (u32 *)dev->keycode; | |
631 | old_keycode = k[scancode]; | |
632 | k[scancode] = keycode; | |
633 | break; | |
634 | } | |
635 | } | |
636 | ||
4f93df40 DT |
637 | __clear_bit(old_keycode, dev->keybit); |
638 | __set_bit(keycode, dev->keybit); | |
c8e4c772 MR |
639 | |
640 | for (i = 0; i < dev->keycodemax; i++) { | |
641 | if (input_fetch_keycode(dev, i) == old_keycode) { | |
4f93df40 | 642 | __set_bit(old_keycode, dev->keybit); |
c8e4c772 MR |
643 | break; /* Setting the bit twice is useless, so break */ |
644 | } | |
645 | } | |
646 | ||
647 | return 0; | |
648 | } | |
649 | ||
f4f37c8e DT |
650 | /** |
651 | * input_get_keycode - retrieve keycode currently mapped to a given scancode | |
652 | * @dev: input device which keymap is being queried | |
653 | * @scancode: scancode (or its equivalent for device in question) for which | |
654 | * keycode is needed | |
655 | * @keycode: result | |
656 | * | |
657 | * This function should be called by anyone interested in retrieving current | |
658 | * keymap. Presently keyboard and evdev handlers use it. | |
659 | */ | |
58b93995 DT |
660 | int input_get_keycode(struct input_dev *dev, |
661 | unsigned int scancode, unsigned int *keycode) | |
f4f37c8e | 662 | { |
2e2e3b96 DT |
663 | unsigned long flags; |
664 | int retval; | |
665 | ||
666 | spin_lock_irqsave(&dev->event_lock, flags); | |
667 | retval = dev->getkeycode(dev, scancode, keycode); | |
668 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
669 | ||
670 | return retval; | |
f4f37c8e DT |
671 | } |
672 | EXPORT_SYMBOL(input_get_keycode); | |
673 | ||
674 | /** | |
675 | * input_get_keycode - assign new keycode to a given scancode | |
676 | * @dev: input device which keymap is being updated | |
677 | * @scancode: scancode (or its equivalent for device in question) | |
678 | * @keycode: new keycode to be assigned to the scancode | |
679 | * | |
680 | * This function should be called by anyone needing to update current | |
681 | * keymap. Presently keyboard and evdev handlers use it. | |
682 | */ | |
58b93995 DT |
683 | int input_set_keycode(struct input_dev *dev, |
684 | unsigned int scancode, unsigned int keycode) | |
f4f37c8e DT |
685 | { |
686 | unsigned long flags; | |
687 | int old_keycode; | |
688 | int retval; | |
689 | ||
58b93995 | 690 | if (keycode > KEY_MAX) |
f4f37c8e DT |
691 | return -EINVAL; |
692 | ||
693 | spin_lock_irqsave(&dev->event_lock, flags); | |
694 | ||
695 | retval = dev->getkeycode(dev, scancode, &old_keycode); | |
696 | if (retval) | |
697 | goto out; | |
698 | ||
699 | retval = dev->setkeycode(dev, scancode, keycode); | |
700 | if (retval) | |
701 | goto out; | |
702 | ||
4f93df40 DT |
703 | /* Make sure KEY_RESERVED did not get enabled. */ |
704 | __clear_bit(KEY_RESERVED, dev->keybit); | |
705 | ||
f4f37c8e DT |
706 | /* |
707 | * Simulate keyup event if keycode is not present | |
708 | * in the keymap anymore | |
709 | */ | |
710 | if (test_bit(EV_KEY, dev->evbit) && | |
711 | !is_event_supported(old_keycode, dev->keybit, KEY_MAX) && | |
712 | __test_and_clear_bit(old_keycode, dev->key)) { | |
713 | ||
714 | input_pass_event(dev, EV_KEY, old_keycode, 0); | |
715 | if (dev->sync) | |
716 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
717 | } | |
718 | ||
719 | out: | |
720 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
721 | ||
722 | return retval; | |
723 | } | |
724 | EXPORT_SYMBOL(input_set_keycode); | |
c8e4c772 | 725 | |
1da177e4 | 726 | #define MATCH_BIT(bit, max) \ |
7b19ada2 | 727 | for (i = 0; i < BITS_TO_LONGS(max); i++) \ |
1da177e4 LT |
728 | if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \ |
729 | break; \ | |
7b19ada2 | 730 | if (i != BITS_TO_LONGS(max)) \ |
1da177e4 LT |
731 | continue; |
732 | ||
0b7024ac | 733 | static const struct input_device_id *input_match_device(struct input_handler *handler, |
66e66118 | 734 | struct input_dev *dev) |
1da177e4 | 735 | { |
0b7024ac | 736 | const struct input_device_id *id; |
1da177e4 LT |
737 | int i; |
738 | ||
0b7024ac | 739 | for (id = handler->id_table; id->flags || id->driver_info; id++) { |
1da177e4 LT |
740 | |
741 | if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) | |
ddc5d341 | 742 | if (id->bustype != dev->id.bustype) |
1da177e4 LT |
743 | continue; |
744 | ||
745 | if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) | |
ddc5d341 | 746 | if (id->vendor != dev->id.vendor) |
1da177e4 LT |
747 | continue; |
748 | ||
749 | if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) | |
ddc5d341 | 750 | if (id->product != dev->id.product) |
1da177e4 LT |
751 | continue; |
752 | ||
753 | if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) | |
ddc5d341 | 754 | if (id->version != dev->id.version) |
1da177e4 LT |
755 | continue; |
756 | ||
757 | MATCH_BIT(evbit, EV_MAX); | |
758 | MATCH_BIT(keybit, KEY_MAX); | |
759 | MATCH_BIT(relbit, REL_MAX); | |
760 | MATCH_BIT(absbit, ABS_MAX); | |
761 | MATCH_BIT(mscbit, MSC_MAX); | |
762 | MATCH_BIT(ledbit, LED_MAX); | |
763 | MATCH_BIT(sndbit, SND_MAX); | |
764 | MATCH_BIT(ffbit, FF_MAX); | |
ff13f98b | 765 | MATCH_BIT(swbit, SW_MAX); |
1da177e4 | 766 | |
0b7024ac DT |
767 | if (!handler->match || handler->match(handler, dev)) |
768 | return id; | |
1da177e4 LT |
769 | } |
770 | ||
771 | return NULL; | |
772 | } | |
773 | ||
5b2a0826 DT |
774 | static int input_attach_handler(struct input_dev *dev, struct input_handler *handler) |
775 | { | |
776 | const struct input_device_id *id; | |
777 | int error; | |
778 | ||
0b7024ac | 779 | id = input_match_device(handler, dev); |
5b2a0826 DT |
780 | if (!id) |
781 | return -ENODEV; | |
782 | ||
783 | error = handler->connect(handler, dev, id); | |
784 | if (error && error != -ENODEV) | |
785 | printk(KERN_ERR | |
786 | "input: failed to attach handler %s to device %s, " | |
787 | "error: %d\n", | |
9657d75c | 788 | handler->name, kobject_name(&dev->dev.kobj), error); |
5b2a0826 DT |
789 | |
790 | return error; | |
791 | } | |
792 | ||
15e184af DT |
793 | #ifdef CONFIG_COMPAT |
794 | ||
795 | static int input_bits_to_string(char *buf, int buf_size, | |
796 | unsigned long bits, bool skip_empty) | |
797 | { | |
798 | int len = 0; | |
799 | ||
800 | if (INPUT_COMPAT_TEST) { | |
801 | u32 dword = bits >> 32; | |
802 | if (dword || !skip_empty) | |
803 | len += snprintf(buf, buf_size, "%x ", dword); | |
804 | ||
805 | dword = bits & 0xffffffffUL; | |
806 | if (dword || !skip_empty || len) | |
807 | len += snprintf(buf + len, max(buf_size - len, 0), | |
808 | "%x", dword); | |
809 | } else { | |
810 | if (bits || !skip_empty) | |
811 | len += snprintf(buf, buf_size, "%lx", bits); | |
812 | } | |
813 | ||
814 | return len; | |
815 | } | |
816 | ||
817 | #else /* !CONFIG_COMPAT */ | |
818 | ||
819 | static int input_bits_to_string(char *buf, int buf_size, | |
820 | unsigned long bits, bool skip_empty) | |
821 | { | |
822 | return bits || !skip_empty ? | |
823 | snprintf(buf, buf_size, "%lx", bits) : 0; | |
824 | } | |
825 | ||
826 | #endif | |
5b2a0826 | 827 | |
f96b434d DT |
828 | #ifdef CONFIG_PROC_FS |
829 | ||
830 | static struct proc_dir_entry *proc_bus_input_dir; | |
831 | static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); | |
832 | static int input_devices_state; | |
833 | ||
834 | static inline void input_wakeup_procfs_readers(void) | |
835 | { | |
836 | input_devices_state++; | |
837 | wake_up(&input_devices_poll_wait); | |
838 | } | |
839 | ||
969b21cd | 840 | static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait) |
f96b434d | 841 | { |
f96b434d | 842 | poll_wait(file, &input_devices_poll_wait, wait); |
fa886612 DT |
843 | if (file->f_version != input_devices_state) { |
844 | file->f_version = input_devices_state; | |
f96b434d | 845 | return POLLIN | POLLRDNORM; |
fa886612 | 846 | } |
1e0afb28 | 847 | |
f96b434d DT |
848 | return 0; |
849 | } | |
850 | ||
1572ca2a DT |
851 | union input_seq_state { |
852 | struct { | |
853 | unsigned short pos; | |
854 | bool mutex_acquired; | |
855 | }; | |
856 | void *p; | |
857 | }; | |
858 | ||
969b21cd DT |
859 | static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) |
860 | { | |
1572ca2a DT |
861 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
862 | int error; | |
863 | ||
864 | /* We need to fit into seq->private pointer */ | |
865 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
866 | ||
867 | error = mutex_lock_interruptible(&input_mutex); | |
868 | if (error) { | |
869 | state->mutex_acquired = false; | |
870 | return ERR_PTR(error); | |
871 | } | |
872 | ||
873 | state->mutex_acquired = true; | |
f96b434d | 874 | |
ad5d972c | 875 | return seq_list_start(&input_dev_list, *pos); |
969b21cd | 876 | } |
051b2fea | 877 | |
969b21cd DT |
878 | static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
879 | { | |
ad5d972c | 880 | return seq_list_next(v, &input_dev_list, pos); |
969b21cd | 881 | } |
f96b434d | 882 | |
1572ca2a | 883 | static void input_seq_stop(struct seq_file *seq, void *v) |
969b21cd | 884 | { |
1572ca2a DT |
885 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
886 | ||
887 | if (state->mutex_acquired) | |
888 | mutex_unlock(&input_mutex); | |
969b21cd | 889 | } |
f96b434d | 890 | |
969b21cd DT |
891 | static void input_seq_print_bitmap(struct seq_file *seq, const char *name, |
892 | unsigned long *bitmap, int max) | |
893 | { | |
894 | int i; | |
15e184af DT |
895 | bool skip_empty = true; |
896 | char buf[18]; | |
f96b434d | 897 | |
969b21cd | 898 | seq_printf(seq, "B: %s=", name); |
15e184af DT |
899 | |
900 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
901 | if (input_bits_to_string(buf, sizeof(buf), | |
902 | bitmap[i], skip_empty)) { | |
903 | skip_empty = false; | |
904 | seq_printf(seq, "%s%s", buf, i > 0 ? " " : ""); | |
905 | } | |
906 | } | |
907 | ||
908 | /* | |
909 | * If no output was produced print a single 0. | |
910 | */ | |
911 | if (skip_empty) | |
912 | seq_puts(seq, "0"); | |
913 | ||
969b21cd DT |
914 | seq_putc(seq, '\n'); |
915 | } | |
f96b434d | 916 | |
969b21cd DT |
917 | static int input_devices_seq_show(struct seq_file *seq, void *v) |
918 | { | |
919 | struct input_dev *dev = container_of(v, struct input_dev, node); | |
9657d75c | 920 | const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
969b21cd DT |
921 | struct input_handle *handle; |
922 | ||
923 | seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", | |
924 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); | |
925 | ||
926 | seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); | |
927 | seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : ""); | |
928 | seq_printf(seq, "S: Sysfs=%s\n", path ? path : ""); | |
15e03ae8 | 929 | seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : ""); |
969b21cd DT |
930 | seq_printf(seq, "H: Handlers="); |
931 | ||
932 | list_for_each_entry(handle, &dev->h_list, d_node) | |
933 | seq_printf(seq, "%s ", handle->name); | |
934 | seq_putc(seq, '\n'); | |
935 | ||
936 | input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); | |
937 | if (test_bit(EV_KEY, dev->evbit)) | |
938 | input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); | |
939 | if (test_bit(EV_REL, dev->evbit)) | |
940 | input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); | |
941 | if (test_bit(EV_ABS, dev->evbit)) | |
942 | input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); | |
943 | if (test_bit(EV_MSC, dev->evbit)) | |
944 | input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); | |
945 | if (test_bit(EV_LED, dev->evbit)) | |
946 | input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); | |
947 | if (test_bit(EV_SND, dev->evbit)) | |
948 | input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); | |
949 | if (test_bit(EV_FF, dev->evbit)) | |
950 | input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); | |
951 | if (test_bit(EV_SW, dev->evbit)) | |
952 | input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); | |
953 | ||
954 | seq_putc(seq, '\n'); | |
955 | ||
956 | kfree(path); | |
957 | return 0; | |
f96b434d DT |
958 | } |
959 | ||
cec69c37 | 960 | static const struct seq_operations input_devices_seq_ops = { |
969b21cd DT |
961 | .start = input_devices_seq_start, |
962 | .next = input_devices_seq_next, | |
1572ca2a | 963 | .stop = input_seq_stop, |
969b21cd DT |
964 | .show = input_devices_seq_show, |
965 | }; | |
966 | ||
967 | static int input_proc_devices_open(struct inode *inode, struct file *file) | |
f96b434d | 968 | { |
969b21cd DT |
969 | return seq_open(file, &input_devices_seq_ops); |
970 | } | |
971 | ||
2b8693c0 | 972 | static const struct file_operations input_devices_fileops = { |
969b21cd DT |
973 | .owner = THIS_MODULE, |
974 | .open = input_proc_devices_open, | |
975 | .poll = input_proc_devices_poll, | |
976 | .read = seq_read, | |
977 | .llseek = seq_lseek, | |
978 | .release = seq_release, | |
979 | }; | |
980 | ||
981 | static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) | |
982 | { | |
1572ca2a DT |
983 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
984 | int error; | |
985 | ||
986 | /* We need to fit into seq->private pointer */ | |
987 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
988 | ||
989 | error = mutex_lock_interruptible(&input_mutex); | |
990 | if (error) { | |
991 | state->mutex_acquired = false; | |
992 | return ERR_PTR(error); | |
993 | } | |
994 | ||
995 | state->mutex_acquired = true; | |
996 | state->pos = *pos; | |
8006479c | 997 | |
ad5d972c | 998 | return seq_list_start(&input_handler_list, *pos); |
969b21cd | 999 | } |
f96b434d | 1000 | |
969b21cd DT |
1001 | static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1002 | { | |
1572ca2a | 1003 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
f96b434d | 1004 | |
1572ca2a DT |
1005 | state->pos = *pos + 1; |
1006 | return seq_list_next(v, &input_handler_list, pos); | |
969b21cd DT |
1007 | } |
1008 | ||
1009 | static int input_handlers_seq_show(struct seq_file *seq, void *v) | |
1010 | { | |
1011 | struct input_handler *handler = container_of(v, struct input_handler, node); | |
1572ca2a | 1012 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
969b21cd | 1013 | |
1572ca2a | 1014 | seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name); |
ef7995f4 DT |
1015 | if (handler->filter) |
1016 | seq_puts(seq, " (filter)"); | |
969b21cd DT |
1017 | if (handler->fops) |
1018 | seq_printf(seq, " Minor=%d", handler->minor); | |
1019 | seq_putc(seq, '\n'); | |
1020 | ||
1021 | return 0; | |
1022 | } | |
1572ca2a | 1023 | |
cec69c37 | 1024 | static const struct seq_operations input_handlers_seq_ops = { |
969b21cd DT |
1025 | .start = input_handlers_seq_start, |
1026 | .next = input_handlers_seq_next, | |
1572ca2a | 1027 | .stop = input_seq_stop, |
969b21cd DT |
1028 | .show = input_handlers_seq_show, |
1029 | }; | |
1030 | ||
1031 | static int input_proc_handlers_open(struct inode *inode, struct file *file) | |
1032 | { | |
1033 | return seq_open(file, &input_handlers_seq_ops); | |
1034 | } | |
1035 | ||
2b8693c0 | 1036 | static const struct file_operations input_handlers_fileops = { |
969b21cd DT |
1037 | .owner = THIS_MODULE, |
1038 | .open = input_proc_handlers_open, | |
1039 | .read = seq_read, | |
1040 | .llseek = seq_lseek, | |
1041 | .release = seq_release, | |
1042 | }; | |
f96b434d DT |
1043 | |
1044 | static int __init input_proc_init(void) | |
1045 | { | |
1046 | struct proc_dir_entry *entry; | |
1047 | ||
9c37066d | 1048 | proc_bus_input_dir = proc_mkdir("bus/input", NULL); |
f96b434d DT |
1049 | if (!proc_bus_input_dir) |
1050 | return -ENOMEM; | |
1051 | ||
c7705f34 DL |
1052 | entry = proc_create("devices", 0, proc_bus_input_dir, |
1053 | &input_devices_fileops); | |
f96b434d DT |
1054 | if (!entry) |
1055 | goto fail1; | |
1056 | ||
c7705f34 DL |
1057 | entry = proc_create("handlers", 0, proc_bus_input_dir, |
1058 | &input_handlers_fileops); | |
f96b434d DT |
1059 | if (!entry) |
1060 | goto fail2; | |
1061 | ||
f96b434d DT |
1062 | return 0; |
1063 | ||
1064 | fail2: remove_proc_entry("devices", proc_bus_input_dir); | |
9c37066d | 1065 | fail1: remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1066 | return -ENOMEM; |
1067 | } | |
1068 | ||
beffbdc2 | 1069 | static void input_proc_exit(void) |
f96b434d DT |
1070 | { |
1071 | remove_proc_entry("devices", proc_bus_input_dir); | |
1072 | remove_proc_entry("handlers", proc_bus_input_dir); | |
9c37066d | 1073 | remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1074 | } |
1075 | ||
1076 | #else /* !CONFIG_PROC_FS */ | |
1077 | static inline void input_wakeup_procfs_readers(void) { } | |
1078 | static inline int input_proc_init(void) { return 0; } | |
1079 | static inline void input_proc_exit(void) { } | |
1080 | #endif | |
1081 | ||
9657d75c DT |
1082 | #define INPUT_DEV_STRING_ATTR_SHOW(name) \ |
1083 | static ssize_t input_dev_show_##name(struct device *dev, \ | |
1084 | struct device_attribute *attr, \ | |
1085 | char *buf) \ | |
1086 | { \ | |
1087 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1088 | \ | |
1089 | return scnprintf(buf, PAGE_SIZE, "%s\n", \ | |
1090 | input_dev->name ? input_dev->name : ""); \ | |
1091 | } \ | |
1092 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL) | |
5c1e9a6a DT |
1093 | |
1094 | INPUT_DEV_STRING_ATTR_SHOW(name); | |
1095 | INPUT_DEV_STRING_ATTR_SHOW(phys); | |
1096 | INPUT_DEV_STRING_ATTR_SHOW(uniq); | |
1097 | ||
ac648a6a DT |
1098 | static int input_print_modalias_bits(char *buf, int size, |
1099 | char name, unsigned long *bm, | |
1100 | unsigned int min_bit, unsigned int max_bit) | |
1d8f430c | 1101 | { |
ac648a6a | 1102 | int len = 0, i; |
1d8f430c | 1103 | |
ac648a6a DT |
1104 | len += snprintf(buf, max(size, 0), "%c", name); |
1105 | for (i = min_bit; i < max_bit; i++) | |
7b19ada2 | 1106 | if (bm[BIT_WORD(i)] & BIT_MASK(i)) |
ac648a6a | 1107 | len += snprintf(buf + len, max(size - len, 0), "%X,", i); |
1d8f430c RR |
1108 | return len; |
1109 | } | |
1110 | ||
2db66876 DT |
1111 | static int input_print_modalias(char *buf, int size, struct input_dev *id, |
1112 | int add_cr) | |
1d8f430c | 1113 | { |
bd37e5a9 | 1114 | int len; |
1d8f430c | 1115 | |
ac648a6a DT |
1116 | len = snprintf(buf, max(size, 0), |
1117 | "input:b%04Xv%04Xp%04Xe%04X-", | |
1118 | id->id.bustype, id->id.vendor, | |
1119 | id->id.product, id->id.version); | |
1120 | ||
1121 | len += input_print_modalias_bits(buf + len, size - len, | |
1122 | 'e', id->evbit, 0, EV_MAX); | |
1123 | len += input_print_modalias_bits(buf + len, size - len, | |
1124 | 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); | |
1125 | len += input_print_modalias_bits(buf + len, size - len, | |
1126 | 'r', id->relbit, 0, REL_MAX); | |
1127 | len += input_print_modalias_bits(buf + len, size - len, | |
1128 | 'a', id->absbit, 0, ABS_MAX); | |
1129 | len += input_print_modalias_bits(buf + len, size - len, | |
1130 | 'm', id->mscbit, 0, MSC_MAX); | |
1131 | len += input_print_modalias_bits(buf + len, size - len, | |
1132 | 'l', id->ledbit, 0, LED_MAX); | |
1133 | len += input_print_modalias_bits(buf + len, size - len, | |
1134 | 's', id->sndbit, 0, SND_MAX); | |
1135 | len += input_print_modalias_bits(buf + len, size - len, | |
1136 | 'f', id->ffbit, 0, FF_MAX); | |
1137 | len += input_print_modalias_bits(buf + len, size - len, | |
1138 | 'w', id->swbit, 0, SW_MAX); | |
2db66876 DT |
1139 | |
1140 | if (add_cr) | |
ac648a6a | 1141 | len += snprintf(buf + len, max(size - len, 0), "\n"); |
2db66876 | 1142 | |
bd37e5a9 KS |
1143 | return len; |
1144 | } | |
1145 | ||
9657d75c DT |
1146 | static ssize_t input_dev_show_modalias(struct device *dev, |
1147 | struct device_attribute *attr, | |
1148 | char *buf) | |
bd37e5a9 KS |
1149 | { |
1150 | struct input_dev *id = to_input_dev(dev); | |
1151 | ssize_t len; | |
1152 | ||
2db66876 DT |
1153 | len = input_print_modalias(buf, PAGE_SIZE, id, 1); |
1154 | ||
8a3cf456 | 1155 | return min_t(int, len, PAGE_SIZE); |
1d8f430c | 1156 | } |
9657d75c | 1157 | static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); |
1d8f430c | 1158 | |
629b77a4 | 1159 | static struct attribute *input_dev_attrs[] = { |
9657d75c DT |
1160 | &dev_attr_name.attr, |
1161 | &dev_attr_phys.attr, | |
1162 | &dev_attr_uniq.attr, | |
1163 | &dev_attr_modalias.attr, | |
629b77a4 GKH |
1164 | NULL |
1165 | }; | |
1166 | ||
bd0ef235 | 1167 | static struct attribute_group input_dev_attr_group = { |
629b77a4 | 1168 | .attrs = input_dev_attrs, |
5c1e9a6a DT |
1169 | }; |
1170 | ||
9657d75c DT |
1171 | #define INPUT_DEV_ID_ATTR(name) \ |
1172 | static ssize_t input_dev_show_id_##name(struct device *dev, \ | |
1173 | struct device_attribute *attr, \ | |
1174 | char *buf) \ | |
1175 | { \ | |
1176 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1177 | return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \ | |
1178 | } \ | |
1179 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL) | |
5c1e9a6a DT |
1180 | |
1181 | INPUT_DEV_ID_ATTR(bustype); | |
1182 | INPUT_DEV_ID_ATTR(vendor); | |
1183 | INPUT_DEV_ID_ATTR(product); | |
1184 | INPUT_DEV_ID_ATTR(version); | |
1185 | ||
1186 | static struct attribute *input_dev_id_attrs[] = { | |
9657d75c DT |
1187 | &dev_attr_bustype.attr, |
1188 | &dev_attr_vendor.attr, | |
1189 | &dev_attr_product.attr, | |
1190 | &dev_attr_version.attr, | |
5c1e9a6a DT |
1191 | NULL |
1192 | }; | |
1193 | ||
1194 | static struct attribute_group input_dev_id_attr_group = { | |
1195 | .name = "id", | |
1196 | .attrs = input_dev_id_attrs, | |
1197 | }; | |
1198 | ||
969b21cd DT |
1199 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1200 | int max, int add_cr) | |
1201 | { | |
1202 | int i; | |
1203 | int len = 0; | |
15e184af DT |
1204 | bool skip_empty = true; |
1205 | ||
1206 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
1207 | len += input_bits_to_string(buf + len, max(buf_size - len, 0), | |
1208 | bitmap[i], skip_empty); | |
1209 | if (len) { | |
1210 | skip_empty = false; | |
1211 | if (i > 0) | |
1212 | len += snprintf(buf + len, max(buf_size - len, 0), " "); | |
1213 | } | |
1214 | } | |
969b21cd | 1215 | |
15e184af DT |
1216 | /* |
1217 | * If no output was produced print a single 0. | |
1218 | */ | |
1219 | if (len == 0) | |
1220 | len = snprintf(buf, buf_size, "%d", 0); | |
969b21cd DT |
1221 | |
1222 | if (add_cr) | |
1223 | len += snprintf(buf + len, max(buf_size - len, 0), "\n"); | |
1224 | ||
1225 | return len; | |
1226 | } | |
1227 | ||
9657d75c DT |
1228 | #define INPUT_DEV_CAP_ATTR(ev, bm) \ |
1229 | static ssize_t input_dev_show_cap_##bm(struct device *dev, \ | |
1230 | struct device_attribute *attr, \ | |
1231 | char *buf) \ | |
1232 | { \ | |
1233 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1234 | int len = input_print_bitmap(buf, PAGE_SIZE, \ | |
15e184af DT |
1235 | input_dev->bm##bit, ev##_MAX, \ |
1236 | true); \ | |
9657d75c DT |
1237 | return min_t(int, len, PAGE_SIZE); \ |
1238 | } \ | |
1239 | static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL) | |
5c1e9a6a DT |
1240 | |
1241 | INPUT_DEV_CAP_ATTR(EV, ev); | |
1242 | INPUT_DEV_CAP_ATTR(KEY, key); | |
1243 | INPUT_DEV_CAP_ATTR(REL, rel); | |
1244 | INPUT_DEV_CAP_ATTR(ABS, abs); | |
1245 | INPUT_DEV_CAP_ATTR(MSC, msc); | |
1246 | INPUT_DEV_CAP_ATTR(LED, led); | |
1247 | INPUT_DEV_CAP_ATTR(SND, snd); | |
1248 | INPUT_DEV_CAP_ATTR(FF, ff); | |
1249 | INPUT_DEV_CAP_ATTR(SW, sw); | |
1250 | ||
1251 | static struct attribute *input_dev_caps_attrs[] = { | |
9657d75c DT |
1252 | &dev_attr_ev.attr, |
1253 | &dev_attr_key.attr, | |
1254 | &dev_attr_rel.attr, | |
1255 | &dev_attr_abs.attr, | |
1256 | &dev_attr_msc.attr, | |
1257 | &dev_attr_led.attr, | |
1258 | &dev_attr_snd.attr, | |
1259 | &dev_attr_ff.attr, | |
1260 | &dev_attr_sw.attr, | |
5c1e9a6a DT |
1261 | NULL |
1262 | }; | |
1263 | ||
1264 | static struct attribute_group input_dev_caps_attr_group = { | |
1265 | .name = "capabilities", | |
1266 | .attrs = input_dev_caps_attrs, | |
1267 | }; | |
1268 | ||
a4dbd674 | 1269 | static const struct attribute_group *input_dev_attr_groups[] = { |
cb9def4d DT |
1270 | &input_dev_attr_group, |
1271 | &input_dev_id_attr_group, | |
1272 | &input_dev_caps_attr_group, | |
1273 | NULL | |
1274 | }; | |
1275 | ||
9657d75c | 1276 | static void input_dev_release(struct device *device) |
d19fbe8a | 1277 | { |
9657d75c | 1278 | struct input_dev *dev = to_input_dev(device); |
d19fbe8a | 1279 | |
509ca1a9 | 1280 | input_ff_destroy(dev); |
d19fbe8a | 1281 | kfree(dev); |
509ca1a9 | 1282 | |
d19fbe8a DT |
1283 | module_put(THIS_MODULE); |
1284 | } | |
1285 | ||
a7fadbe1 | 1286 | /* |
312c004d | 1287 | * Input uevent interface - loading event handlers based on |
a7fadbe1 DT |
1288 | * device bitfields. |
1289 | */ | |
7eff2e7a | 1290 | static int input_add_uevent_bm_var(struct kobj_uevent_env *env, |
ac648a6a | 1291 | const char *name, unsigned long *bitmap, int max) |
a7fadbe1 | 1292 | { |
7eff2e7a | 1293 | int len; |
a7fadbe1 | 1294 | |
7eff2e7a | 1295 | if (add_uevent_var(env, "%s=", name)) |
a7fadbe1 DT |
1296 | return -ENOMEM; |
1297 | ||
7eff2e7a KS |
1298 | len = input_print_bitmap(&env->buf[env->buflen - 1], |
1299 | sizeof(env->buf) - env->buflen, | |
15e184af | 1300 | bitmap, max, false); |
7eff2e7a | 1301 | if (len >= (sizeof(env->buf) - env->buflen)) |
a7fadbe1 DT |
1302 | return -ENOMEM; |
1303 | ||
7eff2e7a | 1304 | env->buflen += len; |
a7fadbe1 DT |
1305 | return 0; |
1306 | } | |
1307 | ||
7eff2e7a | 1308 | static int input_add_uevent_modalias_var(struct kobj_uevent_env *env, |
ac648a6a DT |
1309 | struct input_dev *dev) |
1310 | { | |
7eff2e7a | 1311 | int len; |
ac648a6a | 1312 | |
7eff2e7a | 1313 | if (add_uevent_var(env, "MODALIAS=")) |
ac648a6a DT |
1314 | return -ENOMEM; |
1315 | ||
7eff2e7a KS |
1316 | len = input_print_modalias(&env->buf[env->buflen - 1], |
1317 | sizeof(env->buf) - env->buflen, | |
1318 | dev, 0); | |
1319 | if (len >= (sizeof(env->buf) - env->buflen)) | |
ac648a6a DT |
1320 | return -ENOMEM; |
1321 | ||
7eff2e7a | 1322 | env->buflen += len; |
ac648a6a DT |
1323 | return 0; |
1324 | } | |
1325 | ||
a7fadbe1 DT |
1326 | #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \ |
1327 | do { \ | |
7eff2e7a | 1328 | int err = add_uevent_var(env, fmt, val); \ |
a7fadbe1 DT |
1329 | if (err) \ |
1330 | return err; \ | |
1331 | } while (0) | |
1332 | ||
1333 | #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \ | |
1334 | do { \ | |
7eff2e7a | 1335 | int err = input_add_uevent_bm_var(env, name, bm, max); \ |
a7fadbe1 DT |
1336 | if (err) \ |
1337 | return err; \ | |
1338 | } while (0) | |
1339 | ||
ac648a6a DT |
1340 | #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \ |
1341 | do { \ | |
7eff2e7a | 1342 | int err = input_add_uevent_modalias_var(env, dev); \ |
ac648a6a DT |
1343 | if (err) \ |
1344 | return err; \ | |
1345 | } while (0) | |
1346 | ||
7eff2e7a | 1347 | static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env) |
a7fadbe1 | 1348 | { |
9657d75c | 1349 | struct input_dev *dev = to_input_dev(device); |
a7fadbe1 DT |
1350 | |
1351 | INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x", | |
1352 | dev->id.bustype, dev->id.vendor, | |
1353 | dev->id.product, dev->id.version); | |
1354 | if (dev->name) | |
1355 | INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); | |
1356 | if (dev->phys) | |
1357 | INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); | |
08de1f04 | 1358 | if (dev->uniq) |
a7fadbe1 DT |
1359 | INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); |
1360 | ||
1361 | INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX); | |
1362 | if (test_bit(EV_KEY, dev->evbit)) | |
1363 | INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX); | |
1364 | if (test_bit(EV_REL, dev->evbit)) | |
1365 | INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX); | |
1366 | if (test_bit(EV_ABS, dev->evbit)) | |
1367 | INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX); | |
1368 | if (test_bit(EV_MSC, dev->evbit)) | |
1369 | INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX); | |
1370 | if (test_bit(EV_LED, dev->evbit)) | |
1371 | INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX); | |
1372 | if (test_bit(EV_SND, dev->evbit)) | |
1373 | INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX); | |
1374 | if (test_bit(EV_FF, dev->evbit)) | |
1375 | INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX); | |
1376 | if (test_bit(EV_SW, dev->evbit)) | |
1377 | INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); | |
1378 | ||
ac648a6a | 1379 | INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); |
a7fadbe1 DT |
1380 | |
1381 | return 0; | |
1382 | } | |
1383 | ||
3cc96351 DT |
1384 | #define INPUT_DO_TOGGLE(dev, type, bits, on) \ |
1385 | do { \ | |
1386 | int i; \ | |
1387 | bool active; \ | |
1388 | \ | |
1389 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1390 | break; \ | |
1391 | \ | |
1392 | for (i = 0; i < type##_MAX; i++) { \ | |
1393 | if (!test_bit(i, dev->bits##bit)) \ | |
1394 | continue; \ | |
1395 | \ | |
1396 | active = test_bit(i, dev->bits); \ | |
1397 | if (!active && !on) \ | |
1398 | continue; \ | |
1399 | \ | |
1400 | dev->event(dev, EV_##type, i, on ? active : 0); \ | |
1401 | } \ | |
ffd0db97 DT |
1402 | } while (0) |
1403 | ||
1c4115e5 | 1404 | #ifdef CONFIG_PM |
ffd0db97 DT |
1405 | static void input_dev_reset(struct input_dev *dev, bool activate) |
1406 | { | |
1407 | if (!dev->event) | |
1408 | return; | |
1409 | ||
1410 | INPUT_DO_TOGGLE(dev, LED, led, activate); | |
1411 | INPUT_DO_TOGGLE(dev, SND, snd, activate); | |
1412 | ||
1413 | if (activate && test_bit(EV_REP, dev->evbit)) { | |
1414 | dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]); | |
1415 | dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]); | |
1416 | } | |
1417 | } | |
1418 | ||
ffd0db97 DT |
1419 | static int input_dev_suspend(struct device *dev) |
1420 | { | |
1421 | struct input_dev *input_dev = to_input_dev(dev); | |
1422 | ||
1423 | mutex_lock(&input_dev->mutex); | |
1424 | input_dev_reset(input_dev, false); | |
1425 | mutex_unlock(&input_dev->mutex); | |
1426 | ||
1427 | return 0; | |
1428 | } | |
1429 | ||
1430 | static int input_dev_resume(struct device *dev) | |
1431 | { | |
1432 | struct input_dev *input_dev = to_input_dev(dev); | |
1433 | ||
1434 | mutex_lock(&input_dev->mutex); | |
1435 | input_dev_reset(input_dev, true); | |
1436 | mutex_unlock(&input_dev->mutex); | |
1437 | ||
1438 | return 0; | |
1439 | } | |
1440 | ||
1441 | static const struct dev_pm_ops input_dev_pm_ops = { | |
1442 | .suspend = input_dev_suspend, | |
1443 | .resume = input_dev_resume, | |
1444 | .poweroff = input_dev_suspend, | |
1445 | .restore = input_dev_resume, | |
1446 | }; | |
1447 | #endif /* CONFIG_PM */ | |
1448 | ||
9657d75c DT |
1449 | static struct device_type input_dev_type = { |
1450 | .groups = input_dev_attr_groups, | |
1451 | .release = input_dev_release, | |
1452 | .uevent = input_dev_uevent, | |
ffd0db97 DT |
1453 | #ifdef CONFIG_PM |
1454 | .pm = &input_dev_pm_ops, | |
1455 | #endif | |
9657d75c DT |
1456 | }; |
1457 | ||
e454cea2 | 1458 | static char *input_devnode(struct device *dev, mode_t *mode) |
aa5ed63e KS |
1459 | { |
1460 | return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev)); | |
1461 | } | |
1462 | ||
ea9f240b | 1463 | struct class input_class = { |
9657d75c | 1464 | .name = "input", |
e454cea2 | 1465 | .devnode = input_devnode, |
d19fbe8a | 1466 | }; |
ca56fe07 | 1467 | EXPORT_SYMBOL_GPL(input_class); |
d19fbe8a | 1468 | |
1447190e DT |
1469 | /** |
1470 | * input_allocate_device - allocate memory for new input device | |
1471 | * | |
1472 | * Returns prepared struct input_dev or NULL. | |
1473 | * | |
1474 | * NOTE: Use input_free_device() to free devices that have not been | |
1475 | * registered; input_unregister_device() should be used for already | |
1476 | * registered devices. | |
1477 | */ | |
d19fbe8a DT |
1478 | struct input_dev *input_allocate_device(void) |
1479 | { | |
1480 | struct input_dev *dev; | |
1481 | ||
1482 | dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); | |
1483 | if (dev) { | |
9657d75c DT |
1484 | dev->dev.type = &input_dev_type; |
1485 | dev->dev.class = &input_class; | |
1486 | device_initialize(&dev->dev); | |
f60d2b11 | 1487 | mutex_init(&dev->mutex); |
8006479c | 1488 | spin_lock_init(&dev->event_lock); |
d19fbe8a DT |
1489 | INIT_LIST_HEAD(&dev->h_list); |
1490 | INIT_LIST_HEAD(&dev->node); | |
655816e4 DT |
1491 | |
1492 | __module_get(THIS_MODULE); | |
d19fbe8a DT |
1493 | } |
1494 | ||
1495 | return dev; | |
1496 | } | |
ca56fe07 | 1497 | EXPORT_SYMBOL(input_allocate_device); |
d19fbe8a | 1498 | |
1447190e DT |
1499 | /** |
1500 | * input_free_device - free memory occupied by input_dev structure | |
1501 | * @dev: input device to free | |
1502 | * | |
1503 | * This function should only be used if input_register_device() | |
1504 | * was not called yet or if it failed. Once device was registered | |
1505 | * use input_unregister_device() and memory will be freed once last | |
8006479c | 1506 | * reference to the device is dropped. |
1447190e DT |
1507 | * |
1508 | * Device should be allocated by input_allocate_device(). | |
1509 | * | |
1510 | * NOTE: If there are references to the input device then memory | |
1511 | * will not be freed until last reference is dropped. | |
1512 | */ | |
f60d2b11 DT |
1513 | void input_free_device(struct input_dev *dev) |
1514 | { | |
54f9e36c | 1515 | if (dev) |
f60d2b11 | 1516 | input_put_device(dev); |
f60d2b11 | 1517 | } |
ca56fe07 | 1518 | EXPORT_SYMBOL(input_free_device); |
f60d2b11 | 1519 | |
534565f2 DT |
1520 | /** |
1521 | * input_set_capability - mark device as capable of a certain event | |
1522 | * @dev: device that is capable of emitting or accepting event | |
1523 | * @type: type of the event (EV_KEY, EV_REL, etc...) | |
1524 | * @code: event code | |
1525 | * | |
1526 | * In addition to setting up corresponding bit in appropriate capability | |
1527 | * bitmap the function also adjusts dev->evbit. | |
1528 | */ | |
1529 | void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code) | |
1530 | { | |
1531 | switch (type) { | |
1532 | case EV_KEY: | |
1533 | __set_bit(code, dev->keybit); | |
1534 | break; | |
1535 | ||
1536 | case EV_REL: | |
1537 | __set_bit(code, dev->relbit); | |
1538 | break; | |
1539 | ||
1540 | case EV_ABS: | |
1541 | __set_bit(code, dev->absbit); | |
1542 | break; | |
1543 | ||
1544 | case EV_MSC: | |
1545 | __set_bit(code, dev->mscbit); | |
1546 | break; | |
1547 | ||
1548 | case EV_SW: | |
1549 | __set_bit(code, dev->swbit); | |
1550 | break; | |
1551 | ||
1552 | case EV_LED: | |
1553 | __set_bit(code, dev->ledbit); | |
1554 | break; | |
1555 | ||
1556 | case EV_SND: | |
1557 | __set_bit(code, dev->sndbit); | |
1558 | break; | |
1559 | ||
1560 | case EV_FF: | |
1561 | __set_bit(code, dev->ffbit); | |
1562 | break; | |
1563 | ||
22d1c398 DB |
1564 | case EV_PWR: |
1565 | /* do nothing */ | |
1566 | break; | |
1567 | ||
534565f2 DT |
1568 | default: |
1569 | printk(KERN_ERR | |
1570 | "input_set_capability: unknown type %u (code %u)\n", | |
1571 | type, code); | |
1572 | dump_stack(); | |
1573 | return; | |
1574 | } | |
1575 | ||
1576 | __set_bit(type, dev->evbit); | |
1577 | } | |
1578 | EXPORT_SYMBOL(input_set_capability); | |
1579 | ||
92a3a587 DT |
1580 | #define INPUT_CLEANSE_BITMASK(dev, type, bits) \ |
1581 | do { \ | |
1582 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1583 | memset(dev->bits##bit, 0, \ | |
1584 | sizeof(dev->bits##bit)); \ | |
1585 | } while (0) | |
1586 | ||
1587 | static void input_cleanse_bitmasks(struct input_dev *dev) | |
1588 | { | |
1589 | INPUT_CLEANSE_BITMASK(dev, KEY, key); | |
1590 | INPUT_CLEANSE_BITMASK(dev, REL, rel); | |
1591 | INPUT_CLEANSE_BITMASK(dev, ABS, abs); | |
1592 | INPUT_CLEANSE_BITMASK(dev, MSC, msc); | |
1593 | INPUT_CLEANSE_BITMASK(dev, LED, led); | |
1594 | INPUT_CLEANSE_BITMASK(dev, SND, snd); | |
1595 | INPUT_CLEANSE_BITMASK(dev, FF, ff); | |
1596 | INPUT_CLEANSE_BITMASK(dev, SW, sw); | |
1597 | } | |
1598 | ||
8006479c DT |
1599 | /** |
1600 | * input_register_device - register device with input core | |
1601 | * @dev: device to be registered | |
1602 | * | |
1603 | * This function registers device with input core. The device must be | |
1604 | * allocated with input_allocate_device() and all it's capabilities | |
1605 | * set up before registering. | |
1606 | * If function fails the device must be freed with input_free_device(). | |
1607 | * Once device has been successfully registered it can be unregistered | |
1608 | * with input_unregister_device(); input_free_device() should not be | |
1609 | * called in this case. | |
1610 | */ | |
5f945489 | 1611 | int input_register_device(struct input_dev *dev) |
1da177e4 | 1612 | { |
bd0ef235 | 1613 | static atomic_t input_no = ATOMIC_INIT(0); |
1da177e4 | 1614 | struct input_handler *handler; |
bd0ef235 DT |
1615 | const char *path; |
1616 | int error; | |
1da177e4 | 1617 | |
4f93df40 | 1618 | /* Every input device generates EV_SYN/SYN_REPORT events. */ |
8006479c | 1619 | __set_bit(EV_SYN, dev->evbit); |
0fbf87ca | 1620 | |
4f93df40 DT |
1621 | /* KEY_RESERVED is not supposed to be transmitted to userspace. */ |
1622 | __clear_bit(KEY_RESERVED, dev->keybit); | |
1623 | ||
92a3a587 DT |
1624 | /* Make sure that bitmasks not mentioned in dev->evbit are clean. */ |
1625 | input_cleanse_bitmasks(dev); | |
1626 | ||
1da177e4 LT |
1627 | /* |
1628 | * If delay and period are pre-set by the driver, then autorepeating | |
1629 | * is handled by the driver itself and we don't do it in input.c. | |
1630 | */ | |
1da177e4 LT |
1631 | init_timer(&dev->timer); |
1632 | if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { | |
1633 | dev->timer.data = (long) dev; | |
1634 | dev->timer.function = input_repeat_key; | |
1635 | dev->rep[REP_DELAY] = 250; | |
1636 | dev->rep[REP_PERIOD] = 33; | |
1637 | } | |
1638 | ||
c8e4c772 MR |
1639 | if (!dev->getkeycode) |
1640 | dev->getkeycode = input_default_getkeycode; | |
1641 | ||
1642 | if (!dev->setkeycode) | |
1643 | dev->setkeycode = input_default_setkeycode; | |
1644 | ||
a6c2490f KS |
1645 | dev_set_name(&dev->dev, "input%ld", |
1646 | (unsigned long) atomic_inc_return(&input_no) - 1); | |
bd0ef235 | 1647 | |
9657d75c | 1648 | error = device_add(&dev->dev); |
bd0ef235 DT |
1649 | if (error) |
1650 | return error; | |
1651 | ||
9657d75c | 1652 | path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
bd0ef235 DT |
1653 | printk(KERN_INFO "input: %s as %s\n", |
1654 | dev->name ? dev->name : "Unspecified device", path ? path : "N/A"); | |
1655 | kfree(path); | |
10204020 | 1656 | |
8006479c DT |
1657 | error = mutex_lock_interruptible(&input_mutex); |
1658 | if (error) { | |
1659 | device_del(&dev->dev); | |
1660 | return error; | |
1661 | } | |
1662 | ||
1663 | list_add_tail(&dev->node, &input_dev_list); | |
1664 | ||
1da177e4 | 1665 | list_for_each_entry(handler, &input_handler_list, node) |
5b2a0826 | 1666 | input_attach_handler(dev, handler); |
1da177e4 | 1667 | |
f96b434d | 1668 | input_wakeup_procfs_readers(); |
5f945489 | 1669 | |
8006479c DT |
1670 | mutex_unlock(&input_mutex); |
1671 | ||
5f945489 | 1672 | return 0; |
1da177e4 | 1673 | } |
ca56fe07 | 1674 | EXPORT_SYMBOL(input_register_device); |
1da177e4 | 1675 | |
8006479c DT |
1676 | /** |
1677 | * input_unregister_device - unregister previously registered device | |
1678 | * @dev: device to be unregistered | |
1679 | * | |
1680 | * This function unregisters an input device. Once device is unregistered | |
1681 | * the caller should not try to access it as it may get freed at any moment. | |
1682 | */ | |
1da177e4 LT |
1683 | void input_unregister_device(struct input_dev *dev) |
1684 | { | |
5b2a0826 | 1685 | struct input_handle *handle, *next; |
1da177e4 | 1686 | |
8006479c | 1687 | input_disconnect_device(dev); |
1da177e4 | 1688 | |
8006479c | 1689 | mutex_lock(&input_mutex); |
1da177e4 | 1690 | |
5b2a0826 | 1691 | list_for_each_entry_safe(handle, next, &dev->h_list, d_node) |
1da177e4 | 1692 | handle->handler->disconnect(handle); |
5b2a0826 | 1693 | WARN_ON(!list_empty(&dev->h_list)); |
1da177e4 | 1694 | |
8006479c | 1695 | del_timer_sync(&dev->timer); |
1da177e4 LT |
1696 | list_del_init(&dev->node); |
1697 | ||
f96b434d | 1698 | input_wakeup_procfs_readers(); |
8006479c DT |
1699 | |
1700 | mutex_unlock(&input_mutex); | |
1701 | ||
1702 | device_unregister(&dev->dev); | |
1da177e4 | 1703 | } |
ca56fe07 | 1704 | EXPORT_SYMBOL(input_unregister_device); |
1da177e4 | 1705 | |
8006479c DT |
1706 | /** |
1707 | * input_register_handler - register a new input handler | |
1708 | * @handler: handler to be registered | |
1709 | * | |
1710 | * This function registers a new input handler (interface) for input | |
1711 | * devices in the system and attaches it to all input devices that | |
1712 | * are compatible with the handler. | |
1713 | */ | |
4263cf0f | 1714 | int input_register_handler(struct input_handler *handler) |
1da177e4 LT |
1715 | { |
1716 | struct input_dev *dev; | |
8006479c DT |
1717 | int retval; |
1718 | ||
1719 | retval = mutex_lock_interruptible(&input_mutex); | |
1720 | if (retval) | |
1721 | return retval; | |
1da177e4 | 1722 | |
1da177e4 LT |
1723 | INIT_LIST_HEAD(&handler->h_list); |
1724 | ||
4263cf0f | 1725 | if (handler->fops != NULL) { |
8006479c DT |
1726 | if (input_table[handler->minor >> 5]) { |
1727 | retval = -EBUSY; | |
1728 | goto out; | |
1729 | } | |
1da177e4 | 1730 | input_table[handler->minor >> 5] = handler; |
4263cf0f | 1731 | } |
1da177e4 LT |
1732 | |
1733 | list_add_tail(&handler->node, &input_handler_list); | |
1734 | ||
1735 | list_for_each_entry(dev, &input_dev_list, node) | |
5b2a0826 | 1736 | input_attach_handler(dev, handler); |
1da177e4 | 1737 | |
f96b434d | 1738 | input_wakeup_procfs_readers(); |
8006479c DT |
1739 | |
1740 | out: | |
1741 | mutex_unlock(&input_mutex); | |
1742 | return retval; | |
1da177e4 | 1743 | } |
ca56fe07 | 1744 | EXPORT_SYMBOL(input_register_handler); |
1da177e4 | 1745 | |
8006479c DT |
1746 | /** |
1747 | * input_unregister_handler - unregisters an input handler | |
1748 | * @handler: handler to be unregistered | |
1749 | * | |
1750 | * This function disconnects a handler from its input devices and | |
1751 | * removes it from lists of known handlers. | |
1752 | */ | |
1da177e4 LT |
1753 | void input_unregister_handler(struct input_handler *handler) |
1754 | { | |
5b2a0826 | 1755 | struct input_handle *handle, *next; |
1da177e4 | 1756 | |
8006479c DT |
1757 | mutex_lock(&input_mutex); |
1758 | ||
5b2a0826 | 1759 | list_for_each_entry_safe(handle, next, &handler->h_list, h_node) |
1da177e4 | 1760 | handler->disconnect(handle); |
5b2a0826 | 1761 | WARN_ON(!list_empty(&handler->h_list)); |
1da177e4 LT |
1762 | |
1763 | list_del_init(&handler->node); | |
1764 | ||
1765 | if (handler->fops != NULL) | |
1766 | input_table[handler->minor >> 5] = NULL; | |
1767 | ||
f96b434d | 1768 | input_wakeup_procfs_readers(); |
8006479c DT |
1769 | |
1770 | mutex_unlock(&input_mutex); | |
1da177e4 | 1771 | } |
ca56fe07 | 1772 | EXPORT_SYMBOL(input_unregister_handler); |
1da177e4 | 1773 | |
66d2a595 DT |
1774 | /** |
1775 | * input_handler_for_each_handle - handle iterator | |
1776 | * @handler: input handler to iterate | |
1777 | * @data: data for the callback | |
1778 | * @fn: function to be called for each handle | |
1779 | * | |
1780 | * Iterate over @bus's list of devices, and call @fn for each, passing | |
1781 | * it @data and stop when @fn returns a non-zero value. The function is | |
1782 | * using RCU to traverse the list and therefore may be usind in atonic | |
1783 | * contexts. The @fn callback is invoked from RCU critical section and | |
1784 | * thus must not sleep. | |
1785 | */ | |
1786 | int input_handler_for_each_handle(struct input_handler *handler, void *data, | |
1787 | int (*fn)(struct input_handle *, void *)) | |
1788 | { | |
1789 | struct input_handle *handle; | |
1790 | int retval = 0; | |
1791 | ||
1792 | rcu_read_lock(); | |
1793 | ||
1794 | list_for_each_entry_rcu(handle, &handler->h_list, h_node) { | |
1795 | retval = fn(handle, data); | |
1796 | if (retval) | |
1797 | break; | |
1798 | } | |
1799 | ||
1800 | rcu_read_unlock(); | |
1801 | ||
1802 | return retval; | |
1803 | } | |
1804 | EXPORT_SYMBOL(input_handler_for_each_handle); | |
1805 | ||
8006479c DT |
1806 | /** |
1807 | * input_register_handle - register a new input handle | |
1808 | * @handle: handle to register | |
1809 | * | |
1810 | * This function puts a new input handle onto device's | |
1811 | * and handler's lists so that events can flow through | |
1812 | * it once it is opened using input_open_device(). | |
1813 | * | |
1814 | * This function is supposed to be called from handler's | |
1815 | * connect() method. | |
1816 | */ | |
5b2a0826 DT |
1817 | int input_register_handle(struct input_handle *handle) |
1818 | { | |
1819 | struct input_handler *handler = handle->handler; | |
8006479c DT |
1820 | struct input_dev *dev = handle->dev; |
1821 | int error; | |
1822 | ||
1823 | /* | |
1824 | * We take dev->mutex here to prevent race with | |
1825 | * input_release_device(). | |
1826 | */ | |
1827 | error = mutex_lock_interruptible(&dev->mutex); | |
1828 | if (error) | |
1829 | return error; | |
ef7995f4 DT |
1830 | |
1831 | /* | |
1832 | * Filters go to the head of the list, normal handlers | |
1833 | * to the tail. | |
1834 | */ | |
1835 | if (handler->filter) | |
1836 | list_add_rcu(&handle->d_node, &dev->h_list); | |
1837 | else | |
1838 | list_add_tail_rcu(&handle->d_node, &dev->h_list); | |
1839 | ||
8006479c | 1840 | mutex_unlock(&dev->mutex); |
5b2a0826 | 1841 | |
8006479c DT |
1842 | /* |
1843 | * Since we are supposed to be called from ->connect() | |
1844 | * which is mutually exclusive with ->disconnect() | |
1845 | * we can't be racing with input_unregister_handle() | |
1846 | * and so separate lock is not needed here. | |
1847 | */ | |
66d2a595 | 1848 | list_add_tail_rcu(&handle->h_node, &handler->h_list); |
5b2a0826 DT |
1849 | |
1850 | if (handler->start) | |
1851 | handler->start(handle); | |
1852 | ||
1853 | return 0; | |
1854 | } | |
1855 | EXPORT_SYMBOL(input_register_handle); | |
1856 | ||
8006479c DT |
1857 | /** |
1858 | * input_unregister_handle - unregister an input handle | |
1859 | * @handle: handle to unregister | |
1860 | * | |
1861 | * This function removes input handle from device's | |
1862 | * and handler's lists. | |
1863 | * | |
1864 | * This function is supposed to be called from handler's | |
1865 | * disconnect() method. | |
1866 | */ | |
5b2a0826 DT |
1867 | void input_unregister_handle(struct input_handle *handle) |
1868 | { | |
8006479c DT |
1869 | struct input_dev *dev = handle->dev; |
1870 | ||
66d2a595 | 1871 | list_del_rcu(&handle->h_node); |
8006479c DT |
1872 | |
1873 | /* | |
1874 | * Take dev->mutex to prevent race with input_release_device(). | |
1875 | */ | |
1876 | mutex_lock(&dev->mutex); | |
1877 | list_del_rcu(&handle->d_node); | |
1878 | mutex_unlock(&dev->mutex); | |
66d2a595 | 1879 | |
82ba56c2 | 1880 | synchronize_rcu(); |
5b2a0826 DT |
1881 | } |
1882 | EXPORT_SYMBOL(input_unregister_handle); | |
1883 | ||
1da177e4 LT |
1884 | static int input_open_file(struct inode *inode, struct file *file) |
1885 | { | |
2edbf853 | 1886 | struct input_handler *handler; |
99ac48f5 | 1887 | const struct file_operations *old_fops, *new_fops = NULL; |
1da177e4 LT |
1888 | int err; |
1889 | ||
2f2177c8 AB |
1890 | err = mutex_lock_interruptible(&input_mutex); |
1891 | if (err) | |
1892 | return err; | |
1893 | ||
1da177e4 | 1894 | /* No load-on-demand here? */ |
2edbf853 | 1895 | handler = input_table[iminor(inode) >> 5]; |
2f2177c8 AB |
1896 | if (handler) |
1897 | new_fops = fops_get(handler->fops); | |
1898 | ||
1899 | mutex_unlock(&input_mutex); | |
1da177e4 LT |
1900 | |
1901 | /* | |
1902 | * That's _really_ odd. Usually NULL ->open means "nothing special", | |
1903 | * not "no device". Oh, well... | |
1904 | */ | |
2f2177c8 | 1905 | if (!new_fops || !new_fops->open) { |
1da177e4 | 1906 | fops_put(new_fops); |
2edbf853 JC |
1907 | err = -ENODEV; |
1908 | goto out; | |
1da177e4 | 1909 | } |
2f2177c8 | 1910 | |
1da177e4 LT |
1911 | old_fops = file->f_op; |
1912 | file->f_op = new_fops; | |
1913 | ||
1914 | err = new_fops->open(inode, file); | |
1da177e4 LT |
1915 | if (err) { |
1916 | fops_put(file->f_op); | |
1917 | file->f_op = fops_get(old_fops); | |
1918 | } | |
1919 | fops_put(old_fops); | |
2edbf853 | 1920 | out: |
1da177e4 LT |
1921 | return err; |
1922 | } | |
1923 | ||
2b8693c0 | 1924 | static const struct file_operations input_fops = { |
1da177e4 LT |
1925 | .owner = THIS_MODULE, |
1926 | .open = input_open_file, | |
1927 | }; | |
1928 | ||
61994a61 HR |
1929 | static void __init input_init_abs_bypass(void) |
1930 | { | |
1931 | const unsigned int *p; | |
1932 | ||
1933 | for (p = input_abs_bypass_init_data; *p; p++) | |
1934 | input_abs_bypass[BIT_WORD(*p)] |= BIT_MASK(*p); | |
1935 | } | |
1936 | ||
f96b434d | 1937 | static int __init input_init(void) |
1da177e4 | 1938 | { |
f96b434d | 1939 | int err; |
1da177e4 | 1940 | |
61994a61 HR |
1941 | input_init_abs_bypass(); |
1942 | ||
ea9f240b | 1943 | err = class_register(&input_class); |
d19fbe8a DT |
1944 | if (err) { |
1945 | printk(KERN_ERR "input: unable to register input_dev class\n"); | |
1946 | return err; | |
1947 | } | |
1948 | ||
f96b434d DT |
1949 | err = input_proc_init(); |
1950 | if (err) | |
b0fdfebb | 1951 | goto fail1; |
1da177e4 | 1952 | |
f96b434d DT |
1953 | err = register_chrdev(INPUT_MAJOR, "input", &input_fops); |
1954 | if (err) { | |
1955 | printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR); | |
b0fdfebb | 1956 | goto fail2; |
1da177e4 | 1957 | } |
e334016f | 1958 | |
1da177e4 | 1959 | return 0; |
1da177e4 | 1960 | |
b0fdfebb | 1961 | fail2: input_proc_exit(); |
ea9f240b | 1962 | fail1: class_unregister(&input_class); |
f96b434d | 1963 | return err; |
1da177e4 LT |
1964 | } |
1965 | ||
1966 | static void __exit input_exit(void) | |
1967 | { | |
f96b434d | 1968 | input_proc_exit(); |
1da177e4 | 1969 | unregister_chrdev(INPUT_MAJOR, "input"); |
ea9f240b | 1970 | class_unregister(&input_class); |
1da177e4 LT |
1971 | } |
1972 | ||
1973 | subsys_initcall(input_init); | |
1974 | module_exit(input_exit); |