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 | ||
36 | static LIST_HEAD(input_dev_list); | |
37 | static LIST_HEAD(input_handler_list); | |
38 | ||
8006479c DT |
39 | /* |
40 | * input_mutex protects access to both input_dev_list and input_handler_list. | |
41 | * This also causes input_[un]register_device and input_[un]register_handler | |
42 | * be mutually exclusive which simplifies locking in drivers implementing | |
43 | * input handlers. | |
44 | */ | |
45 | static DEFINE_MUTEX(input_mutex); | |
46 | ||
1da177e4 LT |
47 | static struct input_handler *input_table[8]; |
48 | ||
8006479c DT |
49 | static inline int is_event_supported(unsigned int code, |
50 | unsigned long *bm, unsigned int max) | |
1da177e4 | 51 | { |
8006479c DT |
52 | return code <= max && test_bit(code, bm); |
53 | } | |
1da177e4 | 54 | |
8006479c DT |
55 | static int input_defuzz_abs_event(int value, int old_val, int fuzz) |
56 | { | |
57 | if (fuzz) { | |
58 | if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2) | |
59 | return old_val; | |
1da177e4 | 60 | |
8006479c DT |
61 | if (value > old_val - fuzz && value < old_val + fuzz) |
62 | return (old_val * 3 + value) / 4; | |
1da177e4 | 63 | |
8006479c DT |
64 | if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2) |
65 | return (old_val + value) / 2; | |
66 | } | |
1da177e4 | 67 | |
8006479c DT |
68 | return value; |
69 | } | |
1da177e4 | 70 | |
8006479c | 71 | /* |
ef7995f4 DT |
72 | * Pass event first through all filters and then, if event has not been |
73 | * filtered out, through all open handles. This function is called with | |
82ba56c2 | 74 | * dev->event_lock held and interrupts disabled. |
8006479c DT |
75 | */ |
76 | static void input_pass_event(struct input_dev *dev, | |
5fdbe44d | 77 | struct input_handler *src_handler, |
8006479c DT |
78 | unsigned int type, unsigned int code, int value) |
79 | { | |
ef7995f4 | 80 | struct input_handler *handler; |
82ba56c2 DT |
81 | struct input_handle *handle; |
82 | ||
83 | rcu_read_lock(); | |
1da177e4 | 84 | |
82ba56c2 | 85 | handle = rcu_dereference(dev->grab); |
8006479c DT |
86 | if (handle) |
87 | handle->handler->event(handle, type, code, value); | |
ef7995f4 DT |
88 | else { |
89 | bool filtered = false; | |
90 | ||
91 | list_for_each_entry_rcu(handle, &dev->h_list, d_node) { | |
92 | if (!handle->open) | |
93 | continue; | |
94 | ||
95 | handler = handle->handler; | |
5fdbe44d DT |
96 | |
97 | /* | |
98 | * If this is the handler that injected this | |
99 | * particular event we want to skip it to avoid | |
100 | * filters firing again and again. | |
101 | */ | |
102 | if (handler == src_handler) | |
103 | continue; | |
104 | ||
ef7995f4 DT |
105 | if (!handler->filter) { |
106 | if (filtered) | |
107 | break; | |
108 | ||
109 | handler->event(handle, type, code, value); | |
110 | ||
111 | } else if (handler->filter(handle, type, code, value)) | |
112 | filtered = true; | |
113 | } | |
114 | } | |
115 | ||
82ba56c2 | 116 | rcu_read_unlock(); |
8006479c | 117 | } |
1da177e4 | 118 | |
8006479c DT |
119 | /* |
120 | * Generate software autorepeat event. Note that we take | |
121 | * dev->event_lock here to avoid racing with input_event | |
122 | * which may cause keys get "stuck". | |
123 | */ | |
124 | static void input_repeat_key(unsigned long data) | |
125 | { | |
126 | struct input_dev *dev = (void *) data; | |
127 | unsigned long flags; | |
1da177e4 | 128 | |
8006479c | 129 | spin_lock_irqsave(&dev->event_lock, flags); |
1da177e4 | 130 | |
8006479c DT |
131 | if (test_bit(dev->repeat_key, dev->key) && |
132 | is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) { | |
1da177e4 | 133 | |
5fdbe44d | 134 | input_pass_event(dev, NULL, EV_KEY, dev->repeat_key, 2); |
1da177e4 | 135 | |
8006479c DT |
136 | if (dev->sync) { |
137 | /* | |
138 | * Only send SYN_REPORT if we are not in a middle | |
139 | * of driver parsing a new hardware packet. | |
140 | * Otherwise assume that the driver will send | |
141 | * SYN_REPORT once it's done. | |
142 | */ | |
5fdbe44d | 143 | input_pass_event(dev, NULL, EV_SYN, SYN_REPORT, 1); |
8006479c | 144 | } |
31581066 | 145 | |
8006479c DT |
146 | if (dev->rep[REP_PERIOD]) |
147 | mod_timer(&dev->timer, jiffies + | |
148 | msecs_to_jiffies(dev->rep[REP_PERIOD])); | |
149 | } | |
31581066 | 150 | |
8006479c DT |
151 | spin_unlock_irqrestore(&dev->event_lock, flags); |
152 | } | |
31581066 | 153 | |
8006479c DT |
154 | static void input_start_autorepeat(struct input_dev *dev, int code) |
155 | { | |
156 | if (test_bit(EV_REP, dev->evbit) && | |
157 | dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && | |
158 | dev->timer.data) { | |
159 | dev->repeat_key = code; | |
160 | mod_timer(&dev->timer, | |
161 | jiffies + msecs_to_jiffies(dev->rep[REP_DELAY])); | |
162 | } | |
163 | } | |
31581066 | 164 | |
e7b5c1ef JB |
165 | static void input_stop_autorepeat(struct input_dev *dev) |
166 | { | |
167 | del_timer(&dev->timer); | |
168 | } | |
169 | ||
8006479c DT |
170 | #define INPUT_IGNORE_EVENT 0 |
171 | #define INPUT_PASS_TO_HANDLERS 1 | |
172 | #define INPUT_PASS_TO_DEVICE 2 | |
173 | #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE) | |
1da177e4 | 174 | |
40d007e7 | 175 | static int input_handle_abs_event(struct input_dev *dev, |
5fdbe44d | 176 | struct input_handler *src_handler, |
40d007e7 HR |
177 | unsigned int code, int *pval) |
178 | { | |
179 | bool is_mt_event; | |
180 | int *pold; | |
181 | ||
182 | if (code == ABS_MT_SLOT) { | |
183 | /* | |
184 | * "Stage" the event; we'll flush it later, when we | |
144c0f88 | 185 | * get actual touch data. |
40d007e7 HR |
186 | */ |
187 | if (*pval >= 0 && *pval < dev->mtsize) | |
188 | dev->slot = *pval; | |
189 | ||
190 | return INPUT_IGNORE_EVENT; | |
191 | } | |
192 | ||
193 | is_mt_event = code >= ABS_MT_FIRST && code <= ABS_MT_LAST; | |
194 | ||
195 | if (!is_mt_event) { | |
d31b2865 | 196 | pold = &dev->absinfo[code].value; |
40d007e7 HR |
197 | } else if (dev->mt) { |
198 | struct input_mt_slot *mtslot = &dev->mt[dev->slot]; | |
199 | pold = &mtslot->abs[code - ABS_MT_FIRST]; | |
200 | } else { | |
201 | /* | |
144c0f88 | 202 | * Bypass filtering for multi-touch events when |
40d007e7 HR |
203 | * not employing slots. |
204 | */ | |
205 | pold = NULL; | |
206 | } | |
207 | ||
208 | if (pold) { | |
209 | *pval = input_defuzz_abs_event(*pval, *pold, | |
d31b2865 | 210 | dev->absinfo[code].fuzz); |
40d007e7 HR |
211 | if (*pold == *pval) |
212 | return INPUT_IGNORE_EVENT; | |
213 | ||
214 | *pold = *pval; | |
215 | } | |
216 | ||
217 | /* Flush pending "slot" event */ | |
987a6c02 DM |
218 | if (is_mt_event && dev->slot != input_abs_get_val(dev, ABS_MT_SLOT)) { |
219 | input_abs_set_val(dev, ABS_MT_SLOT, dev->slot); | |
5fdbe44d DT |
220 | input_pass_event(dev, src_handler, |
221 | EV_ABS, ABS_MT_SLOT, dev->slot); | |
40d007e7 HR |
222 | } |
223 | ||
224 | return INPUT_PASS_TO_HANDLERS; | |
225 | } | |
226 | ||
8006479c | 227 | static void input_handle_event(struct input_dev *dev, |
5fdbe44d | 228 | struct input_handler *src_handler, |
8006479c DT |
229 | unsigned int type, unsigned int code, int value) |
230 | { | |
231 | int disposition = INPUT_IGNORE_EVENT; | |
1da177e4 | 232 | |
8006479c | 233 | switch (type) { |
1da177e4 | 234 | |
8006479c DT |
235 | case EV_SYN: |
236 | switch (code) { | |
237 | case SYN_CONFIG: | |
238 | disposition = INPUT_PASS_TO_ALL; | |
239 | break; | |
1da177e4 | 240 | |
8006479c DT |
241 | case SYN_REPORT: |
242 | if (!dev->sync) { | |
20da92de | 243 | dev->sync = true; |
8006479c | 244 | disposition = INPUT_PASS_TO_HANDLERS; |
1da177e4 | 245 | } |
1da177e4 | 246 | break; |
5e5ee686 | 247 | case SYN_MT_REPORT: |
20da92de | 248 | dev->sync = false; |
5e5ee686 HR |
249 | disposition = INPUT_PASS_TO_HANDLERS; |
250 | break; | |
8006479c DT |
251 | } |
252 | break; | |
1da177e4 | 253 | |
8006479c DT |
254 | case EV_KEY: |
255 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
256 | !!test_bit(code, dev->key) != value) { | |
1da177e4 | 257 | |
8006479c DT |
258 | if (value != 2) { |
259 | __change_bit(code, dev->key); | |
260 | if (value) | |
261 | input_start_autorepeat(dev, code); | |
e7b5c1ef JB |
262 | else |
263 | input_stop_autorepeat(dev); | |
8006479c | 264 | } |
1da177e4 | 265 | |
8006479c DT |
266 | disposition = INPUT_PASS_TO_HANDLERS; |
267 | } | |
268 | break; | |
1da177e4 | 269 | |
8006479c DT |
270 | case EV_SW: |
271 | if (is_event_supported(code, dev->swbit, SW_MAX) && | |
272 | !!test_bit(code, dev->sw) != value) { | |
1da177e4 | 273 | |
8006479c DT |
274 | __change_bit(code, dev->sw); |
275 | disposition = INPUT_PASS_TO_HANDLERS; | |
276 | } | |
277 | break; | |
1da177e4 | 278 | |
8006479c | 279 | case EV_ABS: |
40d007e7 | 280 | if (is_event_supported(code, dev->absbit, ABS_MAX)) |
5fdbe44d DT |
281 | disposition = input_handle_abs_event(dev, src_handler, |
282 | code, &value); | |
61994a61 | 283 | |
8006479c | 284 | break; |
1da177e4 | 285 | |
8006479c DT |
286 | case EV_REL: |
287 | if (is_event_supported(code, dev->relbit, REL_MAX) && value) | |
288 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 289 | |
8006479c | 290 | break; |
1e0afb28 | 291 | |
8006479c DT |
292 | case EV_MSC: |
293 | if (is_event_supported(code, dev->mscbit, MSC_MAX)) | |
294 | disposition = INPUT_PASS_TO_ALL; | |
1da177e4 | 295 | |
8006479c | 296 | break; |
1da177e4 | 297 | |
8006479c DT |
298 | case EV_LED: |
299 | if (is_event_supported(code, dev->ledbit, LED_MAX) && | |
300 | !!test_bit(code, dev->led) != value) { | |
1da177e4 | 301 | |
8006479c DT |
302 | __change_bit(code, dev->led); |
303 | disposition = INPUT_PASS_TO_ALL; | |
304 | } | |
305 | break; | |
306 | ||
307 | case EV_SND: | |
308 | if (is_event_supported(code, dev->sndbit, SND_MAX)) { | |
1da177e4 | 309 | |
8fdc1948 | 310 | if (!!test_bit(code, dev->snd) != !!value) |
8006479c DT |
311 | __change_bit(code, dev->snd); |
312 | disposition = INPUT_PASS_TO_ALL; | |
313 | } | |
314 | break; | |
8fdc1948 | 315 | |
8006479c DT |
316 | case EV_REP: |
317 | if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) { | |
318 | dev->rep[code] = value; | |
319 | disposition = INPUT_PASS_TO_ALL; | |
320 | } | |
321 | break; | |
1da177e4 | 322 | |
8006479c DT |
323 | case EV_FF: |
324 | if (value >= 0) | |
325 | disposition = INPUT_PASS_TO_ALL; | |
326 | break; | |
ed2fa4dd RP |
327 | |
328 | case EV_PWR: | |
329 | disposition = INPUT_PASS_TO_ALL; | |
330 | break; | |
8006479c | 331 | } |
1da177e4 | 332 | |
c9812282 | 333 | if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN) |
20da92de | 334 | dev->sync = false; |
1da177e4 | 335 | |
8006479c DT |
336 | if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event) |
337 | dev->event(dev, type, code, value); | |
1da177e4 | 338 | |
8006479c | 339 | if (disposition & INPUT_PASS_TO_HANDLERS) |
5fdbe44d | 340 | input_pass_event(dev, src_handler, type, code, value); |
8006479c | 341 | } |
1da177e4 | 342 | |
8006479c DT |
343 | /** |
344 | * input_event() - report new input event | |
345 | * @dev: device that generated the event | |
346 | * @type: type of the event | |
347 | * @code: event code | |
348 | * @value: value of the event | |
349 | * | |
350 | * This function should be used by drivers implementing various input | |
df2d4637 DT |
351 | * devices to report input events. See also input_inject_event(). |
352 | * | |
353 | * NOTE: input_event() may be safely used right after input device was | |
354 | * allocated with input_allocate_device(), even before it is registered | |
355 | * with input_register_device(), but the event will not reach any of the | |
356 | * input handlers. Such early invocation of input_event() may be used | |
357 | * to 'seed' initial state of a switch or initial position of absolute | |
358 | * axis, etc. | |
8006479c | 359 | */ |
8006479c DT |
360 | void input_event(struct input_dev *dev, |
361 | unsigned int type, unsigned int code, int value) | |
362 | { | |
363 | unsigned long flags; | |
509ca1a9 | 364 | |
8006479c | 365 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
509ca1a9 | 366 | |
8006479c DT |
367 | spin_lock_irqsave(&dev->event_lock, flags); |
368 | add_input_randomness(type, code, value); | |
5fdbe44d | 369 | input_handle_event(dev, NULL, type, code, value); |
8006479c | 370 | spin_unlock_irqrestore(&dev->event_lock, flags); |
1da177e4 | 371 | } |
1da177e4 | 372 | } |
ca56fe07 | 373 | EXPORT_SYMBOL(input_event); |
1da177e4 | 374 | |
0e739d28 DT |
375 | /** |
376 | * input_inject_event() - send input event from input handler | |
377 | * @handle: input handle to send event through | |
378 | * @type: type of the event | |
379 | * @code: event code | |
380 | * @value: value of the event | |
381 | * | |
8006479c DT |
382 | * Similar to input_event() but will ignore event if device is |
383 | * "grabbed" and handle injecting event is not the one that owns | |
384 | * the device. | |
0e739d28 | 385 | */ |
8006479c DT |
386 | void input_inject_event(struct input_handle *handle, |
387 | unsigned int type, unsigned int code, int value) | |
1da177e4 | 388 | { |
8006479c DT |
389 | struct input_dev *dev = handle->dev; |
390 | struct input_handle *grab; | |
391 | unsigned long flags; | |
1da177e4 | 392 | |
8006479c DT |
393 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
394 | spin_lock_irqsave(&dev->event_lock, flags); | |
1da177e4 | 395 | |
82ba56c2 | 396 | rcu_read_lock(); |
8006479c DT |
397 | grab = rcu_dereference(dev->grab); |
398 | if (!grab || grab == handle) | |
5fdbe44d DT |
399 | input_handle_event(dev, handle->handler, |
400 | type, code, value); | |
82ba56c2 | 401 | rcu_read_unlock(); |
1da177e4 | 402 | |
8006479c DT |
403 | spin_unlock_irqrestore(&dev->event_lock, flags); |
404 | } | |
1da177e4 | 405 | } |
8006479c | 406 | EXPORT_SYMBOL(input_inject_event); |
1da177e4 | 407 | |
d31b2865 DM |
408 | /** |
409 | * input_alloc_absinfo - allocates array of input_absinfo structs | |
410 | * @dev: the input device emitting absolute events | |
411 | * | |
412 | * If the absinfo struct the caller asked for is already allocated, this | |
413 | * functions will not do anything. | |
414 | */ | |
415 | void input_alloc_absinfo(struct input_dev *dev) | |
416 | { | |
417 | if (!dev->absinfo) | |
418 | dev->absinfo = kcalloc(ABS_CNT, sizeof(struct input_absinfo), | |
419 | GFP_KERNEL); | |
420 | ||
421 | WARN(!dev->absinfo, "%s(): kcalloc() failed?\n", __func__); | |
422 | } | |
423 | EXPORT_SYMBOL(input_alloc_absinfo); | |
424 | ||
425 | void input_set_abs_params(struct input_dev *dev, unsigned int axis, | |
426 | int min, int max, int fuzz, int flat) | |
427 | { | |
428 | struct input_absinfo *absinfo; | |
429 | ||
430 | input_alloc_absinfo(dev); | |
431 | if (!dev->absinfo) | |
432 | return; | |
433 | ||
434 | absinfo = &dev->absinfo[axis]; | |
435 | absinfo->minimum = min; | |
436 | absinfo->maximum = max; | |
437 | absinfo->fuzz = fuzz; | |
438 | absinfo->flat = flat; | |
439 | ||
440 | dev->absbit[BIT_WORD(axis)] |= BIT_MASK(axis); | |
441 | } | |
442 | EXPORT_SYMBOL(input_set_abs_params); | |
443 | ||
444 | ||
8006479c DT |
445 | /** |
446 | * input_grab_device - grabs device for exclusive use | |
447 | * @handle: input handle that wants to own the device | |
448 | * | |
449 | * When a device is grabbed by an input handle all events generated by | |
450 | * the device are delivered only to this handle. Also events injected | |
451 | * by other input handles are ignored while device is grabbed. | |
452 | */ | |
1da177e4 LT |
453 | int input_grab_device(struct input_handle *handle) |
454 | { | |
8006479c DT |
455 | struct input_dev *dev = handle->dev; |
456 | int retval; | |
1da177e4 | 457 | |
8006479c DT |
458 | retval = mutex_lock_interruptible(&dev->mutex); |
459 | if (retval) | |
460 | return retval; | |
461 | ||
462 | if (dev->grab) { | |
463 | retval = -EBUSY; | |
464 | goto out; | |
465 | } | |
466 | ||
467 | rcu_assign_pointer(dev->grab, handle); | |
82ba56c2 | 468 | synchronize_rcu(); |
8006479c DT |
469 | |
470 | out: | |
471 | mutex_unlock(&dev->mutex); | |
472 | return retval; | |
1da177e4 | 473 | } |
ca56fe07 | 474 | EXPORT_SYMBOL(input_grab_device); |
1da177e4 | 475 | |
8006479c | 476 | static void __input_release_device(struct input_handle *handle) |
1da177e4 | 477 | { |
a2b2ed2c | 478 | struct input_dev *dev = handle->dev; |
c7e8dc6e | 479 | |
a2b2ed2c | 480 | if (dev->grab == handle) { |
8006479c DT |
481 | rcu_assign_pointer(dev->grab, NULL); |
482 | /* Make sure input_pass_event() notices that grab is gone */ | |
82ba56c2 | 483 | synchronize_rcu(); |
a2b2ed2c AM |
484 | |
485 | list_for_each_entry(handle, &dev->h_list, d_node) | |
8006479c | 486 | if (handle->open && handle->handler->start) |
c7e8dc6e DT |
487 | handle->handler->start(handle); |
488 | } | |
1da177e4 | 489 | } |
8006479c DT |
490 | |
491 | /** | |
492 | * input_release_device - release previously grabbed device | |
493 | * @handle: input handle that owns the device | |
494 | * | |
495 | * Releases previously grabbed device so that other input handles can | |
496 | * start receiving input events. Upon release all handlers attached | |
497 | * to the device have their start() method called so they have a change | |
498 | * to synchronize device state with the rest of the system. | |
499 | */ | |
500 | void input_release_device(struct input_handle *handle) | |
501 | { | |
502 | struct input_dev *dev = handle->dev; | |
503 | ||
504 | mutex_lock(&dev->mutex); | |
505 | __input_release_device(handle); | |
506 | mutex_unlock(&dev->mutex); | |
507 | } | |
ca56fe07 | 508 | EXPORT_SYMBOL(input_release_device); |
1da177e4 | 509 | |
8006479c DT |
510 | /** |
511 | * input_open_device - open input device | |
512 | * @handle: handle through which device is being accessed | |
513 | * | |
514 | * This function should be called by input handlers when they | |
515 | * want to start receive events from given input device. | |
516 | */ | |
1da177e4 LT |
517 | int input_open_device(struct input_handle *handle) |
518 | { | |
0fbf87ca | 519 | struct input_dev *dev = handle->dev; |
8006479c | 520 | int retval; |
0fbf87ca | 521 | |
8006479c DT |
522 | retval = mutex_lock_interruptible(&dev->mutex); |
523 | if (retval) | |
524 | return retval; | |
525 | ||
526 | if (dev->going_away) { | |
527 | retval = -ENODEV; | |
528 | goto out; | |
529 | } | |
0fbf87ca | 530 | |
1da177e4 | 531 | handle->open++; |
0fbf87ca DT |
532 | |
533 | if (!dev->users++ && dev->open) | |
8006479c DT |
534 | retval = dev->open(dev); |
535 | ||
536 | if (retval) { | |
537 | dev->users--; | |
538 | if (!--handle->open) { | |
539 | /* | |
540 | * Make sure we are not delivering any more events | |
541 | * through this handle | |
542 | */ | |
82ba56c2 | 543 | synchronize_rcu(); |
8006479c DT |
544 | } |
545 | } | |
0fbf87ca | 546 | |
8006479c | 547 | out: |
e676c232 | 548 | mutex_unlock(&dev->mutex); |
8006479c | 549 | return retval; |
1da177e4 | 550 | } |
ca56fe07 | 551 | EXPORT_SYMBOL(input_open_device); |
1da177e4 | 552 | |
8006479c | 553 | int input_flush_device(struct input_handle *handle, struct file *file) |
1da177e4 | 554 | { |
8006479c DT |
555 | struct input_dev *dev = handle->dev; |
556 | int retval; | |
1da177e4 | 557 | |
8006479c DT |
558 | retval = mutex_lock_interruptible(&dev->mutex); |
559 | if (retval) | |
560 | return retval; | |
561 | ||
562 | if (dev->flush) | |
563 | retval = dev->flush(dev, file); | |
564 | ||
565 | mutex_unlock(&dev->mutex); | |
566 | return retval; | |
1da177e4 | 567 | } |
ca56fe07 | 568 | EXPORT_SYMBOL(input_flush_device); |
1da177e4 | 569 | |
8006479c DT |
570 | /** |
571 | * input_close_device - close input device | |
572 | * @handle: handle through which device is being accessed | |
573 | * | |
574 | * This function should be called by input handlers when they | |
575 | * want to stop receive events from given input device. | |
576 | */ | |
1da177e4 LT |
577 | void input_close_device(struct input_handle *handle) |
578 | { | |
0fbf87ca DT |
579 | struct input_dev *dev = handle->dev; |
580 | ||
e676c232 | 581 | mutex_lock(&dev->mutex); |
0fbf87ca | 582 | |
8006479c DT |
583 | __input_release_device(handle); |
584 | ||
0fbf87ca DT |
585 | if (!--dev->users && dev->close) |
586 | dev->close(dev); | |
8006479c DT |
587 | |
588 | if (!--handle->open) { | |
589 | /* | |
82ba56c2 | 590 | * synchronize_rcu() makes sure that input_pass_event() |
8006479c DT |
591 | * completed and that no more input events are delivered |
592 | * through this handle | |
593 | */ | |
82ba56c2 | 594 | synchronize_rcu(); |
8006479c | 595 | } |
0fbf87ca | 596 | |
e676c232 | 597 | mutex_unlock(&dev->mutex); |
1da177e4 | 598 | } |
ca56fe07 | 599 | EXPORT_SYMBOL(input_close_device); |
1da177e4 | 600 | |
866d7d7b ON |
601 | /* |
602 | * Simulate keyup events for all keys that are marked as pressed. | |
603 | * The function must be called with dev->event_lock held. | |
604 | */ | |
605 | static void input_dev_release_keys(struct input_dev *dev) | |
606 | { | |
607 | int code; | |
608 | ||
609 | if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) { | |
610 | for (code = 0; code <= KEY_MAX; code++) { | |
611 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
612 | __test_and_clear_bit(code, dev->key)) { | |
5fdbe44d | 613 | input_pass_event(dev, NULL, EV_KEY, code, 0); |
866d7d7b ON |
614 | } |
615 | } | |
5fdbe44d | 616 | input_pass_event(dev, NULL, EV_SYN, SYN_REPORT, 1); |
866d7d7b ON |
617 | } |
618 | } | |
619 | ||
8006479c DT |
620 | /* |
621 | * Prepare device for unregistering | |
622 | */ | |
623 | static void input_disconnect_device(struct input_dev *dev) | |
624 | { | |
625 | struct input_handle *handle; | |
8006479c DT |
626 | |
627 | /* | |
628 | * Mark device as going away. Note that we take dev->mutex here | |
629 | * not to protect access to dev->going_away but rather to ensure | |
630 | * that there are no threads in the middle of input_open_device() | |
631 | */ | |
632 | mutex_lock(&dev->mutex); | |
ffd0db97 | 633 | dev->going_away = true; |
8006479c DT |
634 | mutex_unlock(&dev->mutex); |
635 | ||
636 | spin_lock_irq(&dev->event_lock); | |
637 | ||
638 | /* | |
639 | * Simulate keyup events for all pressed keys so that handlers | |
640 | * are not left with "stuck" keys. The driver may continue | |
641 | * generate events even after we done here but they will not | |
642 | * reach any handlers. | |
643 | */ | |
866d7d7b | 644 | input_dev_release_keys(dev); |
8006479c DT |
645 | |
646 | list_for_each_entry(handle, &dev->h_list, d_node) | |
647 | handle->open = 0; | |
648 | ||
649 | spin_unlock_irq(&dev->event_lock); | |
650 | } | |
651 | ||
8613e4c2 MCC |
652 | /** |
653 | * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry | |
654 | * @ke: keymap entry containing scancode to be converted. | |
655 | * @scancode: pointer to the location where converted scancode should | |
656 | * be stored. | |
657 | * | |
658 | * This function is used to convert scancode stored in &struct keymap_entry | |
659 | * into scalar form understood by legacy keymap handling methods. These | |
660 | * methods expect scancodes to be represented as 'unsigned int'. | |
661 | */ | |
662 | int input_scancode_to_scalar(const struct input_keymap_entry *ke, | |
663 | unsigned int *scancode) | |
664 | { | |
665 | switch (ke->len) { | |
666 | case 1: | |
667 | *scancode = *((u8 *)ke->scancode); | |
668 | break; | |
669 | ||
670 | case 2: | |
671 | *scancode = *((u16 *)ke->scancode); | |
672 | break; | |
673 | ||
674 | case 4: | |
675 | *scancode = *((u32 *)ke->scancode); | |
676 | break; | |
677 | ||
678 | default: | |
679 | return -EINVAL; | |
680 | } | |
681 | ||
682 | return 0; | |
683 | } | |
684 | EXPORT_SYMBOL(input_scancode_to_scalar); | |
685 | ||
686 | /* | |
687 | * Those routines handle the default case where no [gs]etkeycode() is | |
688 | * defined. In this case, an array indexed by the scancode is used. | |
689 | */ | |
690 | ||
691 | static unsigned int input_fetch_keycode(struct input_dev *dev, | |
692 | unsigned int index) | |
c8e4c772 MR |
693 | { |
694 | switch (dev->keycodesize) { | |
8613e4c2 MCC |
695 | case 1: |
696 | return ((u8 *)dev->keycode)[index]; | |
c8e4c772 | 697 | |
8613e4c2 MCC |
698 | case 2: |
699 | return ((u16 *)dev->keycode)[index]; | |
c8e4c772 | 700 | |
8613e4c2 MCC |
701 | default: |
702 | return ((u32 *)dev->keycode)[index]; | |
c8e4c772 MR |
703 | } |
704 | } | |
705 | ||
706 | static int input_default_getkeycode(struct input_dev *dev, | |
8613e4c2 | 707 | struct input_keymap_entry *ke) |
c8e4c772 | 708 | { |
8613e4c2 MCC |
709 | unsigned int index; |
710 | int error; | |
711 | ||
c8e4c772 MR |
712 | if (!dev->keycodesize) |
713 | return -EINVAL; | |
714 | ||
8613e4c2 MCC |
715 | if (ke->flags & INPUT_KEYMAP_BY_INDEX) |
716 | index = ke->index; | |
717 | else { | |
718 | error = input_scancode_to_scalar(ke, &index); | |
719 | if (error) | |
720 | return error; | |
721 | } | |
722 | ||
723 | if (index >= dev->keycodemax) | |
c8e4c772 MR |
724 | return -EINVAL; |
725 | ||
8613e4c2 MCC |
726 | ke->keycode = input_fetch_keycode(dev, index); |
727 | ke->index = index; | |
728 | ke->len = sizeof(index); | |
729 | memcpy(ke->scancode, &index, sizeof(index)); | |
c8e4c772 MR |
730 | |
731 | return 0; | |
732 | } | |
733 | ||
734 | static int input_default_setkeycode(struct input_dev *dev, | |
8613e4c2 MCC |
735 | const struct input_keymap_entry *ke, |
736 | unsigned int *old_keycode) | |
c8e4c772 | 737 | { |
8613e4c2 MCC |
738 | unsigned int index; |
739 | int error; | |
c8e4c772 MR |
740 | int i; |
741 | ||
8613e4c2 | 742 | if (!dev->keycodesize) |
c8e4c772 MR |
743 | return -EINVAL; |
744 | ||
8613e4c2 MCC |
745 | if (ke->flags & INPUT_KEYMAP_BY_INDEX) { |
746 | index = ke->index; | |
747 | } else { | |
748 | error = input_scancode_to_scalar(ke, &index); | |
749 | if (error) | |
750 | return error; | |
751 | } | |
752 | ||
753 | if (index >= dev->keycodemax) | |
c8e4c772 MR |
754 | return -EINVAL; |
755 | ||
8613e4c2 MCC |
756 | if (dev->keycodesize < sizeof(dev->keycode) && |
757 | (ke->keycode >> (dev->keycodesize * 8))) | |
c8e4c772 MR |
758 | return -EINVAL; |
759 | ||
760 | switch (dev->keycodesize) { | |
761 | case 1: { | |
762 | u8 *k = (u8 *)dev->keycode; | |
8613e4c2 MCC |
763 | *old_keycode = k[index]; |
764 | k[index] = ke->keycode; | |
c8e4c772 MR |
765 | break; |
766 | } | |
767 | case 2: { | |
768 | u16 *k = (u16 *)dev->keycode; | |
8613e4c2 MCC |
769 | *old_keycode = k[index]; |
770 | k[index] = ke->keycode; | |
c8e4c772 MR |
771 | break; |
772 | } | |
773 | default: { | |
774 | u32 *k = (u32 *)dev->keycode; | |
8613e4c2 MCC |
775 | *old_keycode = k[index]; |
776 | k[index] = ke->keycode; | |
c8e4c772 MR |
777 | break; |
778 | } | |
779 | } | |
780 | ||
8613e4c2 MCC |
781 | __clear_bit(*old_keycode, dev->keybit); |
782 | __set_bit(ke->keycode, dev->keybit); | |
c8e4c772 MR |
783 | |
784 | for (i = 0; i < dev->keycodemax; i++) { | |
8613e4c2 MCC |
785 | if (input_fetch_keycode(dev, i) == *old_keycode) { |
786 | __set_bit(*old_keycode, dev->keybit); | |
c8e4c772 MR |
787 | break; /* Setting the bit twice is useless, so break */ |
788 | } | |
789 | } | |
790 | ||
791 | return 0; | |
792 | } | |
793 | ||
f4f37c8e DT |
794 | /** |
795 | * input_get_keycode - retrieve keycode currently mapped to a given scancode | |
796 | * @dev: input device which keymap is being queried | |
8613e4c2 | 797 | * @ke: keymap entry |
f4f37c8e DT |
798 | * |
799 | * This function should be called by anyone interested in retrieving current | |
8613e4c2 | 800 | * keymap. Presently evdev handlers use it. |
f4f37c8e | 801 | */ |
8613e4c2 | 802 | int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke) |
f4f37c8e | 803 | { |
2e2e3b96 DT |
804 | unsigned long flags; |
805 | int retval; | |
806 | ||
807 | spin_lock_irqsave(&dev->event_lock, flags); | |
2e2e3b96 | 808 | |
8613e4c2 MCC |
809 | if (dev->getkeycode) { |
810 | /* | |
811 | * Support for legacy drivers, that don't implement the new | |
812 | * ioctls | |
813 | */ | |
814 | u32 scancode = ke->index; | |
815 | ||
816 | memcpy(ke->scancode, &scancode, sizeof(scancode)); | |
817 | ke->len = sizeof(scancode); | |
818 | retval = dev->getkeycode(dev, scancode, &ke->keycode); | |
819 | } else { | |
820 | retval = dev->getkeycode_new(dev, ke); | |
821 | } | |
822 | ||
823 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
2e2e3b96 | 824 | return retval; |
f4f37c8e DT |
825 | } |
826 | EXPORT_SYMBOL(input_get_keycode); | |
827 | ||
828 | /** | |
8613e4c2 | 829 | * input_set_keycode - attribute a keycode to a given scancode |
f4f37c8e | 830 | * @dev: input device which keymap is being updated |
8613e4c2 | 831 | * @ke: new keymap entry |
f4f37c8e DT |
832 | * |
833 | * This function should be called by anyone needing to update current | |
834 | * keymap. Presently keyboard and evdev handlers use it. | |
835 | */ | |
58b93995 | 836 | int input_set_keycode(struct input_dev *dev, |
8613e4c2 | 837 | const struct input_keymap_entry *ke) |
f4f37c8e DT |
838 | { |
839 | unsigned long flags; | |
fd6cf3dd | 840 | unsigned int old_keycode; |
f4f37c8e DT |
841 | int retval; |
842 | ||
8613e4c2 | 843 | if (ke->keycode > KEY_MAX) |
f4f37c8e DT |
844 | return -EINVAL; |
845 | ||
846 | spin_lock_irqsave(&dev->event_lock, flags); | |
847 | ||
8613e4c2 MCC |
848 | if (dev->setkeycode) { |
849 | /* | |
850 | * Support for legacy drivers, that don't implement the new | |
851 | * ioctls | |
852 | */ | |
853 | unsigned int scancode; | |
854 | ||
855 | retval = input_scancode_to_scalar(ke, &scancode); | |
856 | if (retval) | |
857 | goto out; | |
858 | ||
859 | /* | |
860 | * We need to know the old scancode, in order to generate a | |
861 | * keyup effect, if the set operation happens successfully | |
862 | */ | |
863 | if (!dev->getkeycode) { | |
864 | retval = -EINVAL; | |
865 | goto out; | |
866 | } | |
867 | ||
868 | retval = dev->getkeycode(dev, scancode, &old_keycode); | |
869 | if (retval) | |
870 | goto out; | |
871 | ||
872 | retval = dev->setkeycode(dev, scancode, ke->keycode); | |
873 | } else { | |
874 | retval = dev->setkeycode_new(dev, ke, &old_keycode); | |
875 | } | |
f4f37c8e | 876 | |
f4f37c8e DT |
877 | if (retval) |
878 | goto out; | |
879 | ||
4f93df40 DT |
880 | /* Make sure KEY_RESERVED did not get enabled. */ |
881 | __clear_bit(KEY_RESERVED, dev->keybit); | |
882 | ||
f4f37c8e DT |
883 | /* |
884 | * Simulate keyup event if keycode is not present | |
885 | * in the keymap anymore | |
886 | */ | |
887 | if (test_bit(EV_KEY, dev->evbit) && | |
888 | !is_event_supported(old_keycode, dev->keybit, KEY_MAX) && | |
889 | __test_and_clear_bit(old_keycode, dev->key)) { | |
890 | ||
5fdbe44d | 891 | input_pass_event(dev, NULL, EV_KEY, old_keycode, 0); |
f4f37c8e | 892 | if (dev->sync) |
5fdbe44d | 893 | input_pass_event(dev, NULL, EV_SYN, SYN_REPORT, 1); |
f4f37c8e DT |
894 | } |
895 | ||
896 | out: | |
897 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
898 | ||
899 | return retval; | |
900 | } | |
901 | EXPORT_SYMBOL(input_set_keycode); | |
c8e4c772 | 902 | |
1da177e4 | 903 | #define MATCH_BIT(bit, max) \ |
7b19ada2 | 904 | for (i = 0; i < BITS_TO_LONGS(max); i++) \ |
1da177e4 LT |
905 | if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \ |
906 | break; \ | |
7b19ada2 | 907 | if (i != BITS_TO_LONGS(max)) \ |
1da177e4 LT |
908 | continue; |
909 | ||
0b7024ac | 910 | static const struct input_device_id *input_match_device(struct input_handler *handler, |
66e66118 | 911 | struct input_dev *dev) |
1da177e4 | 912 | { |
0b7024ac | 913 | const struct input_device_id *id; |
1da177e4 LT |
914 | int i; |
915 | ||
0b7024ac | 916 | for (id = handler->id_table; id->flags || id->driver_info; id++) { |
1da177e4 LT |
917 | |
918 | if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) | |
ddc5d341 | 919 | if (id->bustype != dev->id.bustype) |
1da177e4 LT |
920 | continue; |
921 | ||
922 | if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) | |
ddc5d341 | 923 | if (id->vendor != dev->id.vendor) |
1da177e4 LT |
924 | continue; |
925 | ||
926 | if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) | |
ddc5d341 | 927 | if (id->product != dev->id.product) |
1da177e4 LT |
928 | continue; |
929 | ||
930 | if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) | |
ddc5d341 | 931 | if (id->version != dev->id.version) |
1da177e4 LT |
932 | continue; |
933 | ||
934 | MATCH_BIT(evbit, EV_MAX); | |
935 | MATCH_BIT(keybit, KEY_MAX); | |
936 | MATCH_BIT(relbit, REL_MAX); | |
937 | MATCH_BIT(absbit, ABS_MAX); | |
938 | MATCH_BIT(mscbit, MSC_MAX); | |
939 | MATCH_BIT(ledbit, LED_MAX); | |
940 | MATCH_BIT(sndbit, SND_MAX); | |
941 | MATCH_BIT(ffbit, FF_MAX); | |
ff13f98b | 942 | MATCH_BIT(swbit, SW_MAX); |
1da177e4 | 943 | |
0b7024ac DT |
944 | if (!handler->match || handler->match(handler, dev)) |
945 | return id; | |
1da177e4 LT |
946 | } |
947 | ||
948 | return NULL; | |
949 | } | |
950 | ||
5b2a0826 DT |
951 | static int input_attach_handler(struct input_dev *dev, struct input_handler *handler) |
952 | { | |
953 | const struct input_device_id *id; | |
954 | int error; | |
955 | ||
0b7024ac | 956 | id = input_match_device(handler, dev); |
5b2a0826 DT |
957 | if (!id) |
958 | return -ENODEV; | |
959 | ||
960 | error = handler->connect(handler, dev, id); | |
961 | if (error && error != -ENODEV) | |
962 | printk(KERN_ERR | |
963 | "input: failed to attach handler %s to device %s, " | |
964 | "error: %d\n", | |
9657d75c | 965 | handler->name, kobject_name(&dev->dev.kobj), error); |
5b2a0826 DT |
966 | |
967 | return error; | |
968 | } | |
969 | ||
15e184af DT |
970 | #ifdef CONFIG_COMPAT |
971 | ||
972 | static int input_bits_to_string(char *buf, int buf_size, | |
973 | unsigned long bits, bool skip_empty) | |
974 | { | |
975 | int len = 0; | |
976 | ||
977 | if (INPUT_COMPAT_TEST) { | |
978 | u32 dword = bits >> 32; | |
979 | if (dword || !skip_empty) | |
980 | len += snprintf(buf, buf_size, "%x ", dword); | |
981 | ||
982 | dword = bits & 0xffffffffUL; | |
983 | if (dword || !skip_empty || len) | |
984 | len += snprintf(buf + len, max(buf_size - len, 0), | |
985 | "%x", dword); | |
986 | } else { | |
987 | if (bits || !skip_empty) | |
988 | len += snprintf(buf, buf_size, "%lx", bits); | |
989 | } | |
990 | ||
991 | return len; | |
992 | } | |
993 | ||
994 | #else /* !CONFIG_COMPAT */ | |
995 | ||
996 | static int input_bits_to_string(char *buf, int buf_size, | |
997 | unsigned long bits, bool skip_empty) | |
998 | { | |
999 | return bits || !skip_empty ? | |
1000 | snprintf(buf, buf_size, "%lx", bits) : 0; | |
1001 | } | |
1002 | ||
1003 | #endif | |
5b2a0826 | 1004 | |
f96b434d DT |
1005 | #ifdef CONFIG_PROC_FS |
1006 | ||
1007 | static struct proc_dir_entry *proc_bus_input_dir; | |
1008 | static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); | |
1009 | static int input_devices_state; | |
1010 | ||
1011 | static inline void input_wakeup_procfs_readers(void) | |
1012 | { | |
1013 | input_devices_state++; | |
1014 | wake_up(&input_devices_poll_wait); | |
1015 | } | |
1016 | ||
969b21cd | 1017 | static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait) |
f96b434d | 1018 | { |
f96b434d | 1019 | poll_wait(file, &input_devices_poll_wait, wait); |
fa886612 DT |
1020 | if (file->f_version != input_devices_state) { |
1021 | file->f_version = input_devices_state; | |
f96b434d | 1022 | return POLLIN | POLLRDNORM; |
fa886612 | 1023 | } |
1e0afb28 | 1024 | |
f96b434d DT |
1025 | return 0; |
1026 | } | |
1027 | ||
1572ca2a DT |
1028 | union input_seq_state { |
1029 | struct { | |
1030 | unsigned short pos; | |
1031 | bool mutex_acquired; | |
1032 | }; | |
1033 | void *p; | |
1034 | }; | |
1035 | ||
969b21cd DT |
1036 | static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) |
1037 | { | |
1572ca2a DT |
1038 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1039 | int error; | |
1040 | ||
1041 | /* We need to fit into seq->private pointer */ | |
1042 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
1043 | ||
1044 | error = mutex_lock_interruptible(&input_mutex); | |
1045 | if (error) { | |
1046 | state->mutex_acquired = false; | |
1047 | return ERR_PTR(error); | |
1048 | } | |
1049 | ||
1050 | state->mutex_acquired = true; | |
f96b434d | 1051 | |
ad5d972c | 1052 | return seq_list_start(&input_dev_list, *pos); |
969b21cd | 1053 | } |
051b2fea | 1054 | |
969b21cd DT |
1055 | static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1056 | { | |
ad5d972c | 1057 | return seq_list_next(v, &input_dev_list, pos); |
969b21cd | 1058 | } |
f96b434d | 1059 | |
1572ca2a | 1060 | static void input_seq_stop(struct seq_file *seq, void *v) |
969b21cd | 1061 | { |
1572ca2a DT |
1062 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1063 | ||
1064 | if (state->mutex_acquired) | |
1065 | mutex_unlock(&input_mutex); | |
969b21cd | 1066 | } |
f96b434d | 1067 | |
969b21cd DT |
1068 | static void input_seq_print_bitmap(struct seq_file *seq, const char *name, |
1069 | unsigned long *bitmap, int max) | |
1070 | { | |
1071 | int i; | |
15e184af DT |
1072 | bool skip_empty = true; |
1073 | char buf[18]; | |
f96b434d | 1074 | |
969b21cd | 1075 | seq_printf(seq, "B: %s=", name); |
15e184af DT |
1076 | |
1077 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
1078 | if (input_bits_to_string(buf, sizeof(buf), | |
1079 | bitmap[i], skip_empty)) { | |
1080 | skip_empty = false; | |
1081 | seq_printf(seq, "%s%s", buf, i > 0 ? " " : ""); | |
1082 | } | |
1083 | } | |
1084 | ||
1085 | /* | |
1086 | * If no output was produced print a single 0. | |
1087 | */ | |
1088 | if (skip_empty) | |
1089 | seq_puts(seq, "0"); | |
1090 | ||
969b21cd DT |
1091 | seq_putc(seq, '\n'); |
1092 | } | |
f96b434d | 1093 | |
969b21cd DT |
1094 | static int input_devices_seq_show(struct seq_file *seq, void *v) |
1095 | { | |
1096 | struct input_dev *dev = container_of(v, struct input_dev, node); | |
9657d75c | 1097 | const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
969b21cd DT |
1098 | struct input_handle *handle; |
1099 | ||
1100 | seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", | |
1101 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); | |
1102 | ||
1103 | seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); | |
1104 | seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : ""); | |
1105 | seq_printf(seq, "S: Sysfs=%s\n", path ? path : ""); | |
15e03ae8 | 1106 | seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : ""); |
969b21cd DT |
1107 | seq_printf(seq, "H: Handlers="); |
1108 | ||
1109 | list_for_each_entry(handle, &dev->h_list, d_node) | |
1110 | seq_printf(seq, "%s ", handle->name); | |
1111 | seq_putc(seq, '\n'); | |
1112 | ||
1113 | input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); | |
1114 | if (test_bit(EV_KEY, dev->evbit)) | |
1115 | input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); | |
1116 | if (test_bit(EV_REL, dev->evbit)) | |
1117 | input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); | |
1118 | if (test_bit(EV_ABS, dev->evbit)) | |
1119 | input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); | |
1120 | if (test_bit(EV_MSC, dev->evbit)) | |
1121 | input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); | |
1122 | if (test_bit(EV_LED, dev->evbit)) | |
1123 | input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); | |
1124 | if (test_bit(EV_SND, dev->evbit)) | |
1125 | input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); | |
1126 | if (test_bit(EV_FF, dev->evbit)) | |
1127 | input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); | |
1128 | if (test_bit(EV_SW, dev->evbit)) | |
1129 | input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); | |
1130 | ||
1131 | seq_putc(seq, '\n'); | |
1132 | ||
1133 | kfree(path); | |
1134 | return 0; | |
f96b434d DT |
1135 | } |
1136 | ||
cec69c37 | 1137 | static const struct seq_operations input_devices_seq_ops = { |
969b21cd DT |
1138 | .start = input_devices_seq_start, |
1139 | .next = input_devices_seq_next, | |
1572ca2a | 1140 | .stop = input_seq_stop, |
969b21cd DT |
1141 | .show = input_devices_seq_show, |
1142 | }; | |
1143 | ||
1144 | static int input_proc_devices_open(struct inode *inode, struct file *file) | |
f96b434d | 1145 | { |
969b21cd DT |
1146 | return seq_open(file, &input_devices_seq_ops); |
1147 | } | |
1148 | ||
2b8693c0 | 1149 | static const struct file_operations input_devices_fileops = { |
969b21cd DT |
1150 | .owner = THIS_MODULE, |
1151 | .open = input_proc_devices_open, | |
1152 | .poll = input_proc_devices_poll, | |
1153 | .read = seq_read, | |
1154 | .llseek = seq_lseek, | |
1155 | .release = seq_release, | |
1156 | }; | |
1157 | ||
1158 | static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) | |
1159 | { | |
1572ca2a DT |
1160 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1161 | int error; | |
1162 | ||
1163 | /* We need to fit into seq->private pointer */ | |
1164 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
1165 | ||
1166 | error = mutex_lock_interruptible(&input_mutex); | |
1167 | if (error) { | |
1168 | state->mutex_acquired = false; | |
1169 | return ERR_PTR(error); | |
1170 | } | |
1171 | ||
1172 | state->mutex_acquired = true; | |
1173 | state->pos = *pos; | |
8006479c | 1174 | |
ad5d972c | 1175 | return seq_list_start(&input_handler_list, *pos); |
969b21cd | 1176 | } |
f96b434d | 1177 | |
969b21cd DT |
1178 | static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1179 | { | |
1572ca2a | 1180 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
f96b434d | 1181 | |
1572ca2a DT |
1182 | state->pos = *pos + 1; |
1183 | return seq_list_next(v, &input_handler_list, pos); | |
969b21cd DT |
1184 | } |
1185 | ||
1186 | static int input_handlers_seq_show(struct seq_file *seq, void *v) | |
1187 | { | |
1188 | struct input_handler *handler = container_of(v, struct input_handler, node); | |
1572ca2a | 1189 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
969b21cd | 1190 | |
1572ca2a | 1191 | seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name); |
ef7995f4 DT |
1192 | if (handler->filter) |
1193 | seq_puts(seq, " (filter)"); | |
969b21cd DT |
1194 | if (handler->fops) |
1195 | seq_printf(seq, " Minor=%d", handler->minor); | |
1196 | seq_putc(seq, '\n'); | |
1197 | ||
1198 | return 0; | |
1199 | } | |
1572ca2a | 1200 | |
cec69c37 | 1201 | static const struct seq_operations input_handlers_seq_ops = { |
969b21cd DT |
1202 | .start = input_handlers_seq_start, |
1203 | .next = input_handlers_seq_next, | |
1572ca2a | 1204 | .stop = input_seq_stop, |
969b21cd DT |
1205 | .show = input_handlers_seq_show, |
1206 | }; | |
1207 | ||
1208 | static int input_proc_handlers_open(struct inode *inode, struct file *file) | |
1209 | { | |
1210 | return seq_open(file, &input_handlers_seq_ops); | |
1211 | } | |
1212 | ||
2b8693c0 | 1213 | static const struct file_operations input_handlers_fileops = { |
969b21cd DT |
1214 | .owner = THIS_MODULE, |
1215 | .open = input_proc_handlers_open, | |
1216 | .read = seq_read, | |
1217 | .llseek = seq_lseek, | |
1218 | .release = seq_release, | |
1219 | }; | |
f96b434d DT |
1220 | |
1221 | static int __init input_proc_init(void) | |
1222 | { | |
1223 | struct proc_dir_entry *entry; | |
1224 | ||
9c37066d | 1225 | proc_bus_input_dir = proc_mkdir("bus/input", NULL); |
f96b434d DT |
1226 | if (!proc_bus_input_dir) |
1227 | return -ENOMEM; | |
1228 | ||
c7705f34 DL |
1229 | entry = proc_create("devices", 0, proc_bus_input_dir, |
1230 | &input_devices_fileops); | |
f96b434d DT |
1231 | if (!entry) |
1232 | goto fail1; | |
1233 | ||
c7705f34 DL |
1234 | entry = proc_create("handlers", 0, proc_bus_input_dir, |
1235 | &input_handlers_fileops); | |
f96b434d DT |
1236 | if (!entry) |
1237 | goto fail2; | |
1238 | ||
f96b434d DT |
1239 | return 0; |
1240 | ||
1241 | fail2: remove_proc_entry("devices", proc_bus_input_dir); | |
9c37066d | 1242 | fail1: remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1243 | return -ENOMEM; |
1244 | } | |
1245 | ||
beffbdc2 | 1246 | static void input_proc_exit(void) |
f96b434d DT |
1247 | { |
1248 | remove_proc_entry("devices", proc_bus_input_dir); | |
1249 | remove_proc_entry("handlers", proc_bus_input_dir); | |
9c37066d | 1250 | remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1251 | } |
1252 | ||
1253 | #else /* !CONFIG_PROC_FS */ | |
1254 | static inline void input_wakeup_procfs_readers(void) { } | |
1255 | static inline int input_proc_init(void) { return 0; } | |
1256 | static inline void input_proc_exit(void) { } | |
1257 | #endif | |
1258 | ||
9657d75c DT |
1259 | #define INPUT_DEV_STRING_ATTR_SHOW(name) \ |
1260 | static ssize_t input_dev_show_##name(struct device *dev, \ | |
1261 | struct device_attribute *attr, \ | |
1262 | char *buf) \ | |
1263 | { \ | |
1264 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1265 | \ | |
1266 | return scnprintf(buf, PAGE_SIZE, "%s\n", \ | |
1267 | input_dev->name ? input_dev->name : ""); \ | |
1268 | } \ | |
1269 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL) | |
5c1e9a6a DT |
1270 | |
1271 | INPUT_DEV_STRING_ATTR_SHOW(name); | |
1272 | INPUT_DEV_STRING_ATTR_SHOW(phys); | |
1273 | INPUT_DEV_STRING_ATTR_SHOW(uniq); | |
1274 | ||
ac648a6a DT |
1275 | static int input_print_modalias_bits(char *buf, int size, |
1276 | char name, unsigned long *bm, | |
1277 | unsigned int min_bit, unsigned int max_bit) | |
1d8f430c | 1278 | { |
ac648a6a | 1279 | int len = 0, i; |
1d8f430c | 1280 | |
ac648a6a DT |
1281 | len += snprintf(buf, max(size, 0), "%c", name); |
1282 | for (i = min_bit; i < max_bit; i++) | |
7b19ada2 | 1283 | if (bm[BIT_WORD(i)] & BIT_MASK(i)) |
ac648a6a | 1284 | len += snprintf(buf + len, max(size - len, 0), "%X,", i); |
1d8f430c RR |
1285 | return len; |
1286 | } | |
1287 | ||
2db66876 DT |
1288 | static int input_print_modalias(char *buf, int size, struct input_dev *id, |
1289 | int add_cr) | |
1d8f430c | 1290 | { |
bd37e5a9 | 1291 | int len; |
1d8f430c | 1292 | |
ac648a6a DT |
1293 | len = snprintf(buf, max(size, 0), |
1294 | "input:b%04Xv%04Xp%04Xe%04X-", | |
1295 | id->id.bustype, id->id.vendor, | |
1296 | id->id.product, id->id.version); | |
1297 | ||
1298 | len += input_print_modalias_bits(buf + len, size - len, | |
1299 | 'e', id->evbit, 0, EV_MAX); | |
1300 | len += input_print_modalias_bits(buf + len, size - len, | |
1301 | 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); | |
1302 | len += input_print_modalias_bits(buf + len, size - len, | |
1303 | 'r', id->relbit, 0, REL_MAX); | |
1304 | len += input_print_modalias_bits(buf + len, size - len, | |
1305 | 'a', id->absbit, 0, ABS_MAX); | |
1306 | len += input_print_modalias_bits(buf + len, size - len, | |
1307 | 'm', id->mscbit, 0, MSC_MAX); | |
1308 | len += input_print_modalias_bits(buf + len, size - len, | |
1309 | 'l', id->ledbit, 0, LED_MAX); | |
1310 | len += input_print_modalias_bits(buf + len, size - len, | |
1311 | 's', id->sndbit, 0, SND_MAX); | |
1312 | len += input_print_modalias_bits(buf + len, size - len, | |
1313 | 'f', id->ffbit, 0, FF_MAX); | |
1314 | len += input_print_modalias_bits(buf + len, size - len, | |
1315 | 'w', id->swbit, 0, SW_MAX); | |
2db66876 DT |
1316 | |
1317 | if (add_cr) | |
ac648a6a | 1318 | len += snprintf(buf + len, max(size - len, 0), "\n"); |
2db66876 | 1319 | |
bd37e5a9 KS |
1320 | return len; |
1321 | } | |
1322 | ||
9657d75c DT |
1323 | static ssize_t input_dev_show_modalias(struct device *dev, |
1324 | struct device_attribute *attr, | |
1325 | char *buf) | |
bd37e5a9 KS |
1326 | { |
1327 | struct input_dev *id = to_input_dev(dev); | |
1328 | ssize_t len; | |
1329 | ||
2db66876 DT |
1330 | len = input_print_modalias(buf, PAGE_SIZE, id, 1); |
1331 | ||
8a3cf456 | 1332 | return min_t(int, len, PAGE_SIZE); |
1d8f430c | 1333 | } |
9657d75c | 1334 | static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); |
1d8f430c | 1335 | |
629b77a4 | 1336 | static struct attribute *input_dev_attrs[] = { |
9657d75c DT |
1337 | &dev_attr_name.attr, |
1338 | &dev_attr_phys.attr, | |
1339 | &dev_attr_uniq.attr, | |
1340 | &dev_attr_modalias.attr, | |
629b77a4 GKH |
1341 | NULL |
1342 | }; | |
1343 | ||
bd0ef235 | 1344 | static struct attribute_group input_dev_attr_group = { |
629b77a4 | 1345 | .attrs = input_dev_attrs, |
5c1e9a6a DT |
1346 | }; |
1347 | ||
9657d75c DT |
1348 | #define INPUT_DEV_ID_ATTR(name) \ |
1349 | static ssize_t input_dev_show_id_##name(struct device *dev, \ | |
1350 | struct device_attribute *attr, \ | |
1351 | char *buf) \ | |
1352 | { \ | |
1353 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1354 | return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \ | |
1355 | } \ | |
1356 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL) | |
5c1e9a6a DT |
1357 | |
1358 | INPUT_DEV_ID_ATTR(bustype); | |
1359 | INPUT_DEV_ID_ATTR(vendor); | |
1360 | INPUT_DEV_ID_ATTR(product); | |
1361 | INPUT_DEV_ID_ATTR(version); | |
1362 | ||
1363 | static struct attribute *input_dev_id_attrs[] = { | |
9657d75c DT |
1364 | &dev_attr_bustype.attr, |
1365 | &dev_attr_vendor.attr, | |
1366 | &dev_attr_product.attr, | |
1367 | &dev_attr_version.attr, | |
5c1e9a6a DT |
1368 | NULL |
1369 | }; | |
1370 | ||
1371 | static struct attribute_group input_dev_id_attr_group = { | |
1372 | .name = "id", | |
1373 | .attrs = input_dev_id_attrs, | |
1374 | }; | |
1375 | ||
969b21cd DT |
1376 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1377 | int max, int add_cr) | |
1378 | { | |
1379 | int i; | |
1380 | int len = 0; | |
15e184af DT |
1381 | bool skip_empty = true; |
1382 | ||
1383 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
1384 | len += input_bits_to_string(buf + len, max(buf_size - len, 0), | |
1385 | bitmap[i], skip_empty); | |
1386 | if (len) { | |
1387 | skip_empty = false; | |
1388 | if (i > 0) | |
1389 | len += snprintf(buf + len, max(buf_size - len, 0), " "); | |
1390 | } | |
1391 | } | |
969b21cd | 1392 | |
15e184af DT |
1393 | /* |
1394 | * If no output was produced print a single 0. | |
1395 | */ | |
1396 | if (len == 0) | |
1397 | len = snprintf(buf, buf_size, "%d", 0); | |
969b21cd DT |
1398 | |
1399 | if (add_cr) | |
1400 | len += snprintf(buf + len, max(buf_size - len, 0), "\n"); | |
1401 | ||
1402 | return len; | |
1403 | } | |
1404 | ||
9657d75c DT |
1405 | #define INPUT_DEV_CAP_ATTR(ev, bm) \ |
1406 | static ssize_t input_dev_show_cap_##bm(struct device *dev, \ | |
1407 | struct device_attribute *attr, \ | |
1408 | char *buf) \ | |
1409 | { \ | |
1410 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1411 | int len = input_print_bitmap(buf, PAGE_SIZE, \ | |
15e184af DT |
1412 | input_dev->bm##bit, ev##_MAX, \ |
1413 | true); \ | |
9657d75c DT |
1414 | return min_t(int, len, PAGE_SIZE); \ |
1415 | } \ | |
1416 | static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL) | |
5c1e9a6a DT |
1417 | |
1418 | INPUT_DEV_CAP_ATTR(EV, ev); | |
1419 | INPUT_DEV_CAP_ATTR(KEY, key); | |
1420 | INPUT_DEV_CAP_ATTR(REL, rel); | |
1421 | INPUT_DEV_CAP_ATTR(ABS, abs); | |
1422 | INPUT_DEV_CAP_ATTR(MSC, msc); | |
1423 | INPUT_DEV_CAP_ATTR(LED, led); | |
1424 | INPUT_DEV_CAP_ATTR(SND, snd); | |
1425 | INPUT_DEV_CAP_ATTR(FF, ff); | |
1426 | INPUT_DEV_CAP_ATTR(SW, sw); | |
1427 | ||
1428 | static struct attribute *input_dev_caps_attrs[] = { | |
9657d75c DT |
1429 | &dev_attr_ev.attr, |
1430 | &dev_attr_key.attr, | |
1431 | &dev_attr_rel.attr, | |
1432 | &dev_attr_abs.attr, | |
1433 | &dev_attr_msc.attr, | |
1434 | &dev_attr_led.attr, | |
1435 | &dev_attr_snd.attr, | |
1436 | &dev_attr_ff.attr, | |
1437 | &dev_attr_sw.attr, | |
5c1e9a6a DT |
1438 | NULL |
1439 | }; | |
1440 | ||
1441 | static struct attribute_group input_dev_caps_attr_group = { | |
1442 | .name = "capabilities", | |
1443 | .attrs = input_dev_caps_attrs, | |
1444 | }; | |
1445 | ||
a4dbd674 | 1446 | static const struct attribute_group *input_dev_attr_groups[] = { |
cb9def4d DT |
1447 | &input_dev_attr_group, |
1448 | &input_dev_id_attr_group, | |
1449 | &input_dev_caps_attr_group, | |
1450 | NULL | |
1451 | }; | |
1452 | ||
9657d75c | 1453 | static void input_dev_release(struct device *device) |
d19fbe8a | 1454 | { |
9657d75c | 1455 | struct input_dev *dev = to_input_dev(device); |
d19fbe8a | 1456 | |
509ca1a9 | 1457 | input_ff_destroy(dev); |
40d007e7 | 1458 | input_mt_destroy_slots(dev); |
d31b2865 | 1459 | kfree(dev->absinfo); |
d19fbe8a | 1460 | kfree(dev); |
509ca1a9 | 1461 | |
d19fbe8a DT |
1462 | module_put(THIS_MODULE); |
1463 | } | |
1464 | ||
a7fadbe1 | 1465 | /* |
312c004d | 1466 | * Input uevent interface - loading event handlers based on |
a7fadbe1 DT |
1467 | * device bitfields. |
1468 | */ | |
7eff2e7a | 1469 | static int input_add_uevent_bm_var(struct kobj_uevent_env *env, |
ac648a6a | 1470 | const char *name, unsigned long *bitmap, int max) |
a7fadbe1 | 1471 | { |
7eff2e7a | 1472 | int len; |
a7fadbe1 | 1473 | |
7eff2e7a | 1474 | if (add_uevent_var(env, "%s=", name)) |
a7fadbe1 DT |
1475 | return -ENOMEM; |
1476 | ||
7eff2e7a KS |
1477 | len = input_print_bitmap(&env->buf[env->buflen - 1], |
1478 | sizeof(env->buf) - env->buflen, | |
15e184af | 1479 | bitmap, max, false); |
7eff2e7a | 1480 | if (len >= (sizeof(env->buf) - env->buflen)) |
a7fadbe1 DT |
1481 | return -ENOMEM; |
1482 | ||
7eff2e7a | 1483 | env->buflen += len; |
a7fadbe1 DT |
1484 | return 0; |
1485 | } | |
1486 | ||
7eff2e7a | 1487 | static int input_add_uevent_modalias_var(struct kobj_uevent_env *env, |
ac648a6a DT |
1488 | struct input_dev *dev) |
1489 | { | |
7eff2e7a | 1490 | int len; |
ac648a6a | 1491 | |
7eff2e7a | 1492 | if (add_uevent_var(env, "MODALIAS=")) |
ac648a6a DT |
1493 | return -ENOMEM; |
1494 | ||
7eff2e7a KS |
1495 | len = input_print_modalias(&env->buf[env->buflen - 1], |
1496 | sizeof(env->buf) - env->buflen, | |
1497 | dev, 0); | |
1498 | if (len >= (sizeof(env->buf) - env->buflen)) | |
ac648a6a DT |
1499 | return -ENOMEM; |
1500 | ||
7eff2e7a | 1501 | env->buflen += len; |
ac648a6a DT |
1502 | return 0; |
1503 | } | |
1504 | ||
a7fadbe1 DT |
1505 | #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \ |
1506 | do { \ | |
7eff2e7a | 1507 | int err = add_uevent_var(env, fmt, val); \ |
a7fadbe1 DT |
1508 | if (err) \ |
1509 | return err; \ | |
1510 | } while (0) | |
1511 | ||
1512 | #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \ | |
1513 | do { \ | |
7eff2e7a | 1514 | int err = input_add_uevent_bm_var(env, name, bm, max); \ |
a7fadbe1 DT |
1515 | if (err) \ |
1516 | return err; \ | |
1517 | } while (0) | |
1518 | ||
ac648a6a DT |
1519 | #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \ |
1520 | do { \ | |
7eff2e7a | 1521 | int err = input_add_uevent_modalias_var(env, dev); \ |
ac648a6a DT |
1522 | if (err) \ |
1523 | return err; \ | |
1524 | } while (0) | |
1525 | ||
7eff2e7a | 1526 | static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env) |
a7fadbe1 | 1527 | { |
9657d75c | 1528 | struct input_dev *dev = to_input_dev(device); |
a7fadbe1 DT |
1529 | |
1530 | INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x", | |
1531 | dev->id.bustype, dev->id.vendor, | |
1532 | dev->id.product, dev->id.version); | |
1533 | if (dev->name) | |
1534 | INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); | |
1535 | if (dev->phys) | |
1536 | INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); | |
08de1f04 | 1537 | if (dev->uniq) |
a7fadbe1 DT |
1538 | INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); |
1539 | ||
1540 | INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX); | |
1541 | if (test_bit(EV_KEY, dev->evbit)) | |
1542 | INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX); | |
1543 | if (test_bit(EV_REL, dev->evbit)) | |
1544 | INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX); | |
1545 | if (test_bit(EV_ABS, dev->evbit)) | |
1546 | INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX); | |
1547 | if (test_bit(EV_MSC, dev->evbit)) | |
1548 | INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX); | |
1549 | if (test_bit(EV_LED, dev->evbit)) | |
1550 | INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX); | |
1551 | if (test_bit(EV_SND, dev->evbit)) | |
1552 | INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX); | |
1553 | if (test_bit(EV_FF, dev->evbit)) | |
1554 | INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX); | |
1555 | if (test_bit(EV_SW, dev->evbit)) | |
1556 | INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); | |
1557 | ||
ac648a6a | 1558 | INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); |
a7fadbe1 DT |
1559 | |
1560 | return 0; | |
1561 | } | |
1562 | ||
3cc96351 DT |
1563 | #define INPUT_DO_TOGGLE(dev, type, bits, on) \ |
1564 | do { \ | |
1565 | int i; \ | |
1566 | bool active; \ | |
1567 | \ | |
1568 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1569 | break; \ | |
1570 | \ | |
1571 | for (i = 0; i < type##_MAX; i++) { \ | |
1572 | if (!test_bit(i, dev->bits##bit)) \ | |
1573 | continue; \ | |
1574 | \ | |
1575 | active = test_bit(i, dev->bits); \ | |
1576 | if (!active && !on) \ | |
1577 | continue; \ | |
1578 | \ | |
1579 | dev->event(dev, EV_##type, i, on ? active : 0); \ | |
1580 | } \ | |
ffd0db97 DT |
1581 | } while (0) |
1582 | ||
b50b5216 | 1583 | static void input_dev_toggle(struct input_dev *dev, bool activate) |
ffd0db97 DT |
1584 | { |
1585 | if (!dev->event) | |
1586 | return; | |
1587 | ||
1588 | INPUT_DO_TOGGLE(dev, LED, led, activate); | |
1589 | INPUT_DO_TOGGLE(dev, SND, snd, activate); | |
1590 | ||
1591 | if (activate && test_bit(EV_REP, dev->evbit)) { | |
1592 | dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]); | |
1593 | dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]); | |
1594 | } | |
1595 | } | |
1596 | ||
b50b5216 DT |
1597 | /** |
1598 | * input_reset_device() - reset/restore the state of input device | |
1599 | * @dev: input device whose state needs to be reset | |
1600 | * | |
1601 | * This function tries to reset the state of an opened input device and | |
1602 | * bring internal state and state if the hardware in sync with each other. | |
1603 | * We mark all keys as released, restore LED state, repeat rate, etc. | |
1604 | */ | |
1605 | void input_reset_device(struct input_dev *dev) | |
1606 | { | |
1607 | mutex_lock(&dev->mutex); | |
1608 | ||
1609 | if (dev->users) { | |
1610 | input_dev_toggle(dev, true); | |
1611 | ||
1612 | /* | |
1613 | * Keys that have been pressed at suspend time are unlikely | |
1614 | * to be still pressed when we resume. | |
1615 | */ | |
1616 | spin_lock_irq(&dev->event_lock); | |
1617 | input_dev_release_keys(dev); | |
1618 | spin_unlock_irq(&dev->event_lock); | |
1619 | } | |
1620 | ||
1621 | mutex_unlock(&dev->mutex); | |
1622 | } | |
1623 | EXPORT_SYMBOL(input_reset_device); | |
1624 | ||
1625 | #ifdef CONFIG_PM | |
ffd0db97 DT |
1626 | static int input_dev_suspend(struct device *dev) |
1627 | { | |
1628 | struct input_dev *input_dev = to_input_dev(dev); | |
1629 | ||
1630 | mutex_lock(&input_dev->mutex); | |
b50b5216 DT |
1631 | |
1632 | if (input_dev->users) | |
1633 | input_dev_toggle(input_dev, false); | |
1634 | ||
ffd0db97 DT |
1635 | mutex_unlock(&input_dev->mutex); |
1636 | ||
1637 | return 0; | |
1638 | } | |
1639 | ||
1640 | static int input_dev_resume(struct device *dev) | |
1641 | { | |
1642 | struct input_dev *input_dev = to_input_dev(dev); | |
1643 | ||
b50b5216 | 1644 | input_reset_device(input_dev); |
ffd0db97 DT |
1645 | |
1646 | return 0; | |
1647 | } | |
1648 | ||
1649 | static const struct dev_pm_ops input_dev_pm_ops = { | |
1650 | .suspend = input_dev_suspend, | |
1651 | .resume = input_dev_resume, | |
1652 | .poweroff = input_dev_suspend, | |
1653 | .restore = input_dev_resume, | |
1654 | }; | |
1655 | #endif /* CONFIG_PM */ | |
1656 | ||
9657d75c DT |
1657 | static struct device_type input_dev_type = { |
1658 | .groups = input_dev_attr_groups, | |
1659 | .release = input_dev_release, | |
1660 | .uevent = input_dev_uevent, | |
ffd0db97 DT |
1661 | #ifdef CONFIG_PM |
1662 | .pm = &input_dev_pm_ops, | |
1663 | #endif | |
9657d75c DT |
1664 | }; |
1665 | ||
e454cea2 | 1666 | static char *input_devnode(struct device *dev, mode_t *mode) |
aa5ed63e KS |
1667 | { |
1668 | return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev)); | |
1669 | } | |
1670 | ||
ea9f240b | 1671 | struct class input_class = { |
9657d75c | 1672 | .name = "input", |
e454cea2 | 1673 | .devnode = input_devnode, |
d19fbe8a | 1674 | }; |
ca56fe07 | 1675 | EXPORT_SYMBOL_GPL(input_class); |
d19fbe8a | 1676 | |
1447190e DT |
1677 | /** |
1678 | * input_allocate_device - allocate memory for new input device | |
1679 | * | |
1680 | * Returns prepared struct input_dev or NULL. | |
1681 | * | |
1682 | * NOTE: Use input_free_device() to free devices that have not been | |
1683 | * registered; input_unregister_device() should be used for already | |
1684 | * registered devices. | |
1685 | */ | |
d19fbe8a DT |
1686 | struct input_dev *input_allocate_device(void) |
1687 | { | |
1688 | struct input_dev *dev; | |
1689 | ||
1690 | dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); | |
1691 | if (dev) { | |
9657d75c DT |
1692 | dev->dev.type = &input_dev_type; |
1693 | dev->dev.class = &input_class; | |
1694 | device_initialize(&dev->dev); | |
f60d2b11 | 1695 | mutex_init(&dev->mutex); |
8006479c | 1696 | spin_lock_init(&dev->event_lock); |
d19fbe8a DT |
1697 | INIT_LIST_HEAD(&dev->h_list); |
1698 | INIT_LIST_HEAD(&dev->node); | |
655816e4 DT |
1699 | |
1700 | __module_get(THIS_MODULE); | |
d19fbe8a DT |
1701 | } |
1702 | ||
1703 | return dev; | |
1704 | } | |
ca56fe07 | 1705 | EXPORT_SYMBOL(input_allocate_device); |
d19fbe8a | 1706 | |
1447190e DT |
1707 | /** |
1708 | * input_free_device - free memory occupied by input_dev structure | |
1709 | * @dev: input device to free | |
1710 | * | |
1711 | * This function should only be used if input_register_device() | |
1712 | * was not called yet or if it failed. Once device was registered | |
1713 | * use input_unregister_device() and memory will be freed once last | |
8006479c | 1714 | * reference to the device is dropped. |
1447190e DT |
1715 | * |
1716 | * Device should be allocated by input_allocate_device(). | |
1717 | * | |
1718 | * NOTE: If there are references to the input device then memory | |
1719 | * will not be freed until last reference is dropped. | |
1720 | */ | |
f60d2b11 DT |
1721 | void input_free_device(struct input_dev *dev) |
1722 | { | |
54f9e36c | 1723 | if (dev) |
f60d2b11 | 1724 | input_put_device(dev); |
f60d2b11 | 1725 | } |
ca56fe07 | 1726 | EXPORT_SYMBOL(input_free_device); |
f60d2b11 | 1727 | |
40d007e7 HR |
1728 | /** |
1729 | * input_mt_create_slots() - create MT input slots | |
1730 | * @dev: input device supporting MT events and finger tracking | |
1731 | * @num_slots: number of slots used by the device | |
1732 | * | |
ba4d695a HR |
1733 | * This function allocates all necessary memory for MT slot handling in the |
1734 | * input device, and adds ABS_MT_SLOT to the device capabilities. All slots | |
144c0f88 | 1735 | * are initially marked as unused by setting ABS_MT_TRACKING_ID to -1. |
40d007e7 HR |
1736 | */ |
1737 | int input_mt_create_slots(struct input_dev *dev, unsigned int num_slots) | |
1738 | { | |
ba4d695a HR |
1739 | int i; |
1740 | ||
40d007e7 HR |
1741 | if (!num_slots) |
1742 | return 0; | |
1743 | ||
1744 | dev->mt = kcalloc(num_slots, sizeof(struct input_mt_slot), GFP_KERNEL); | |
1745 | if (!dev->mt) | |
1746 | return -ENOMEM; | |
1747 | ||
1748 | dev->mtsize = num_slots; | |
1749 | input_set_abs_params(dev, ABS_MT_SLOT, 0, num_slots - 1, 0, 0); | |
1750 | ||
ba4d695a HR |
1751 | /* Mark slots as 'unused' */ |
1752 | for (i = 0; i < num_slots; i++) | |
1753 | dev->mt[i].abs[ABS_MT_TRACKING_ID - ABS_MT_FIRST] = -1; | |
1754 | ||
40d007e7 HR |
1755 | return 0; |
1756 | } | |
1757 | EXPORT_SYMBOL(input_mt_create_slots); | |
1758 | ||
1759 | /** | |
1760 | * input_mt_destroy_slots() - frees the MT slots of the input device | |
1761 | * @dev: input device with allocated MT slots | |
1762 | * | |
1763 | * This function is only needed in error path as the input core will | |
1764 | * automatically free the MT slots when the device is destroyed. | |
1765 | */ | |
1766 | void input_mt_destroy_slots(struct input_dev *dev) | |
1767 | { | |
1768 | kfree(dev->mt); | |
1769 | dev->mt = NULL; | |
1770 | dev->mtsize = 0; | |
1771 | } | |
1772 | EXPORT_SYMBOL(input_mt_destroy_slots); | |
1773 | ||
534565f2 DT |
1774 | /** |
1775 | * input_set_capability - mark device as capable of a certain event | |
1776 | * @dev: device that is capable of emitting or accepting event | |
1777 | * @type: type of the event (EV_KEY, EV_REL, etc...) | |
1778 | * @code: event code | |
1779 | * | |
1780 | * In addition to setting up corresponding bit in appropriate capability | |
1781 | * bitmap the function also adjusts dev->evbit. | |
1782 | */ | |
1783 | void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code) | |
1784 | { | |
1785 | switch (type) { | |
1786 | case EV_KEY: | |
1787 | __set_bit(code, dev->keybit); | |
1788 | break; | |
1789 | ||
1790 | case EV_REL: | |
1791 | __set_bit(code, dev->relbit); | |
1792 | break; | |
1793 | ||
1794 | case EV_ABS: | |
1795 | __set_bit(code, dev->absbit); | |
1796 | break; | |
1797 | ||
1798 | case EV_MSC: | |
1799 | __set_bit(code, dev->mscbit); | |
1800 | break; | |
1801 | ||
1802 | case EV_SW: | |
1803 | __set_bit(code, dev->swbit); | |
1804 | break; | |
1805 | ||
1806 | case EV_LED: | |
1807 | __set_bit(code, dev->ledbit); | |
1808 | break; | |
1809 | ||
1810 | case EV_SND: | |
1811 | __set_bit(code, dev->sndbit); | |
1812 | break; | |
1813 | ||
1814 | case EV_FF: | |
1815 | __set_bit(code, dev->ffbit); | |
1816 | break; | |
1817 | ||
22d1c398 DB |
1818 | case EV_PWR: |
1819 | /* do nothing */ | |
1820 | break; | |
1821 | ||
534565f2 DT |
1822 | default: |
1823 | printk(KERN_ERR | |
1824 | "input_set_capability: unknown type %u (code %u)\n", | |
1825 | type, code); | |
1826 | dump_stack(); | |
1827 | return; | |
1828 | } | |
1829 | ||
1830 | __set_bit(type, dev->evbit); | |
1831 | } | |
1832 | EXPORT_SYMBOL(input_set_capability); | |
1833 | ||
92a3a587 DT |
1834 | #define INPUT_CLEANSE_BITMASK(dev, type, bits) \ |
1835 | do { \ | |
1836 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1837 | memset(dev->bits##bit, 0, \ | |
1838 | sizeof(dev->bits##bit)); \ | |
1839 | } while (0) | |
1840 | ||
1841 | static void input_cleanse_bitmasks(struct input_dev *dev) | |
1842 | { | |
1843 | INPUT_CLEANSE_BITMASK(dev, KEY, key); | |
1844 | INPUT_CLEANSE_BITMASK(dev, REL, rel); | |
1845 | INPUT_CLEANSE_BITMASK(dev, ABS, abs); | |
1846 | INPUT_CLEANSE_BITMASK(dev, MSC, msc); | |
1847 | INPUT_CLEANSE_BITMASK(dev, LED, led); | |
1848 | INPUT_CLEANSE_BITMASK(dev, SND, snd); | |
1849 | INPUT_CLEANSE_BITMASK(dev, FF, ff); | |
1850 | INPUT_CLEANSE_BITMASK(dev, SW, sw); | |
1851 | } | |
1852 | ||
8006479c DT |
1853 | /** |
1854 | * input_register_device - register device with input core | |
1855 | * @dev: device to be registered | |
1856 | * | |
1857 | * This function registers device with input core. The device must be | |
1858 | * allocated with input_allocate_device() and all it's capabilities | |
1859 | * set up before registering. | |
1860 | * If function fails the device must be freed with input_free_device(). | |
1861 | * Once device has been successfully registered it can be unregistered | |
1862 | * with input_unregister_device(); input_free_device() should not be | |
1863 | * called in this case. | |
1864 | */ | |
5f945489 | 1865 | int input_register_device(struct input_dev *dev) |
1da177e4 | 1866 | { |
bd0ef235 | 1867 | static atomic_t input_no = ATOMIC_INIT(0); |
1da177e4 | 1868 | struct input_handler *handler; |
bd0ef235 DT |
1869 | const char *path; |
1870 | int error; | |
1da177e4 | 1871 | |
4f93df40 | 1872 | /* Every input device generates EV_SYN/SYN_REPORT events. */ |
8006479c | 1873 | __set_bit(EV_SYN, dev->evbit); |
0fbf87ca | 1874 | |
4f93df40 DT |
1875 | /* KEY_RESERVED is not supposed to be transmitted to userspace. */ |
1876 | __clear_bit(KEY_RESERVED, dev->keybit); | |
1877 | ||
92a3a587 DT |
1878 | /* Make sure that bitmasks not mentioned in dev->evbit are clean. */ |
1879 | input_cleanse_bitmasks(dev); | |
1880 | ||
1da177e4 LT |
1881 | /* |
1882 | * If delay and period are pre-set by the driver, then autorepeating | |
1883 | * is handled by the driver itself and we don't do it in input.c. | |
1884 | */ | |
1da177e4 LT |
1885 | init_timer(&dev->timer); |
1886 | if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { | |
1887 | dev->timer.data = (long) dev; | |
1888 | dev->timer.function = input_repeat_key; | |
1889 | dev->rep[REP_DELAY] = 250; | |
1890 | dev->rep[REP_PERIOD] = 33; | |
1891 | } | |
1892 | ||
8613e4c2 MCC |
1893 | if (!dev->getkeycode && !dev->getkeycode_new) |
1894 | dev->getkeycode_new = input_default_getkeycode; | |
c8e4c772 | 1895 | |
8613e4c2 MCC |
1896 | if (!dev->setkeycode && !dev->setkeycode_new) |
1897 | dev->setkeycode_new = input_default_setkeycode; | |
c8e4c772 | 1898 | |
a6c2490f KS |
1899 | dev_set_name(&dev->dev, "input%ld", |
1900 | (unsigned long) atomic_inc_return(&input_no) - 1); | |
bd0ef235 | 1901 | |
9657d75c | 1902 | error = device_add(&dev->dev); |
bd0ef235 DT |
1903 | if (error) |
1904 | return error; | |
1905 | ||
9657d75c | 1906 | path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
bd0ef235 DT |
1907 | printk(KERN_INFO "input: %s as %s\n", |
1908 | dev->name ? dev->name : "Unspecified device", path ? path : "N/A"); | |
1909 | kfree(path); | |
10204020 | 1910 | |
8006479c DT |
1911 | error = mutex_lock_interruptible(&input_mutex); |
1912 | if (error) { | |
1913 | device_del(&dev->dev); | |
1914 | return error; | |
1915 | } | |
1916 | ||
1917 | list_add_tail(&dev->node, &input_dev_list); | |
1918 | ||
1da177e4 | 1919 | list_for_each_entry(handler, &input_handler_list, node) |
5b2a0826 | 1920 | input_attach_handler(dev, handler); |
1da177e4 | 1921 | |
f96b434d | 1922 | input_wakeup_procfs_readers(); |
5f945489 | 1923 | |
8006479c DT |
1924 | mutex_unlock(&input_mutex); |
1925 | ||
5f945489 | 1926 | return 0; |
1da177e4 | 1927 | } |
ca56fe07 | 1928 | EXPORT_SYMBOL(input_register_device); |
1da177e4 | 1929 | |
8006479c DT |
1930 | /** |
1931 | * input_unregister_device - unregister previously registered device | |
1932 | * @dev: device to be unregistered | |
1933 | * | |
1934 | * This function unregisters an input device. Once device is unregistered | |
1935 | * the caller should not try to access it as it may get freed at any moment. | |
1936 | */ | |
1da177e4 LT |
1937 | void input_unregister_device(struct input_dev *dev) |
1938 | { | |
5b2a0826 | 1939 | struct input_handle *handle, *next; |
1da177e4 | 1940 | |
8006479c | 1941 | input_disconnect_device(dev); |
1da177e4 | 1942 | |
8006479c | 1943 | mutex_lock(&input_mutex); |
1da177e4 | 1944 | |
5b2a0826 | 1945 | list_for_each_entry_safe(handle, next, &dev->h_list, d_node) |
1da177e4 | 1946 | handle->handler->disconnect(handle); |
5b2a0826 | 1947 | WARN_ON(!list_empty(&dev->h_list)); |
1da177e4 | 1948 | |
8006479c | 1949 | del_timer_sync(&dev->timer); |
1da177e4 LT |
1950 | list_del_init(&dev->node); |
1951 | ||
f96b434d | 1952 | input_wakeup_procfs_readers(); |
8006479c DT |
1953 | |
1954 | mutex_unlock(&input_mutex); | |
1955 | ||
1956 | device_unregister(&dev->dev); | |
1da177e4 | 1957 | } |
ca56fe07 | 1958 | EXPORT_SYMBOL(input_unregister_device); |
1da177e4 | 1959 | |
8006479c DT |
1960 | /** |
1961 | * input_register_handler - register a new input handler | |
1962 | * @handler: handler to be registered | |
1963 | * | |
1964 | * This function registers a new input handler (interface) for input | |
1965 | * devices in the system and attaches it to all input devices that | |
1966 | * are compatible with the handler. | |
1967 | */ | |
4263cf0f | 1968 | int input_register_handler(struct input_handler *handler) |
1da177e4 LT |
1969 | { |
1970 | struct input_dev *dev; | |
8006479c DT |
1971 | int retval; |
1972 | ||
1973 | retval = mutex_lock_interruptible(&input_mutex); | |
1974 | if (retval) | |
1975 | return retval; | |
1da177e4 | 1976 | |
1da177e4 LT |
1977 | INIT_LIST_HEAD(&handler->h_list); |
1978 | ||
4263cf0f | 1979 | if (handler->fops != NULL) { |
8006479c DT |
1980 | if (input_table[handler->minor >> 5]) { |
1981 | retval = -EBUSY; | |
1982 | goto out; | |
1983 | } | |
1da177e4 | 1984 | input_table[handler->minor >> 5] = handler; |
4263cf0f | 1985 | } |
1da177e4 LT |
1986 | |
1987 | list_add_tail(&handler->node, &input_handler_list); | |
1988 | ||
1989 | list_for_each_entry(dev, &input_dev_list, node) | |
5b2a0826 | 1990 | input_attach_handler(dev, handler); |
1da177e4 | 1991 | |
f96b434d | 1992 | input_wakeup_procfs_readers(); |
8006479c DT |
1993 | |
1994 | out: | |
1995 | mutex_unlock(&input_mutex); | |
1996 | return retval; | |
1da177e4 | 1997 | } |
ca56fe07 | 1998 | EXPORT_SYMBOL(input_register_handler); |
1da177e4 | 1999 | |
8006479c DT |
2000 | /** |
2001 | * input_unregister_handler - unregisters an input handler | |
2002 | * @handler: handler to be unregistered | |
2003 | * | |
2004 | * This function disconnects a handler from its input devices and | |
2005 | * removes it from lists of known handlers. | |
2006 | */ | |
1da177e4 LT |
2007 | void input_unregister_handler(struct input_handler *handler) |
2008 | { | |
5b2a0826 | 2009 | struct input_handle *handle, *next; |
1da177e4 | 2010 | |
8006479c DT |
2011 | mutex_lock(&input_mutex); |
2012 | ||
5b2a0826 | 2013 | list_for_each_entry_safe(handle, next, &handler->h_list, h_node) |
1da177e4 | 2014 | handler->disconnect(handle); |
5b2a0826 | 2015 | WARN_ON(!list_empty(&handler->h_list)); |
1da177e4 LT |
2016 | |
2017 | list_del_init(&handler->node); | |
2018 | ||
2019 | if (handler->fops != NULL) | |
2020 | input_table[handler->minor >> 5] = NULL; | |
2021 | ||
f96b434d | 2022 | input_wakeup_procfs_readers(); |
8006479c DT |
2023 | |
2024 | mutex_unlock(&input_mutex); | |
1da177e4 | 2025 | } |
ca56fe07 | 2026 | EXPORT_SYMBOL(input_unregister_handler); |
1da177e4 | 2027 | |
66d2a595 DT |
2028 | /** |
2029 | * input_handler_for_each_handle - handle iterator | |
2030 | * @handler: input handler to iterate | |
2031 | * @data: data for the callback | |
2032 | * @fn: function to be called for each handle | |
2033 | * | |
2034 | * Iterate over @bus's list of devices, and call @fn for each, passing | |
2035 | * it @data and stop when @fn returns a non-zero value. The function is | |
2036 | * using RCU to traverse the list and therefore may be usind in atonic | |
2037 | * contexts. The @fn callback is invoked from RCU critical section and | |
2038 | * thus must not sleep. | |
2039 | */ | |
2040 | int input_handler_for_each_handle(struct input_handler *handler, void *data, | |
2041 | int (*fn)(struct input_handle *, void *)) | |
2042 | { | |
2043 | struct input_handle *handle; | |
2044 | int retval = 0; | |
2045 | ||
2046 | rcu_read_lock(); | |
2047 | ||
2048 | list_for_each_entry_rcu(handle, &handler->h_list, h_node) { | |
2049 | retval = fn(handle, data); | |
2050 | if (retval) | |
2051 | break; | |
2052 | } | |
2053 | ||
2054 | rcu_read_unlock(); | |
2055 | ||
2056 | return retval; | |
2057 | } | |
2058 | EXPORT_SYMBOL(input_handler_for_each_handle); | |
2059 | ||
8006479c DT |
2060 | /** |
2061 | * input_register_handle - register a new input handle | |
2062 | * @handle: handle to register | |
2063 | * | |
2064 | * This function puts a new input handle onto device's | |
2065 | * and handler's lists so that events can flow through | |
2066 | * it once it is opened using input_open_device(). | |
2067 | * | |
2068 | * This function is supposed to be called from handler's | |
2069 | * connect() method. | |
2070 | */ | |
5b2a0826 DT |
2071 | int input_register_handle(struct input_handle *handle) |
2072 | { | |
2073 | struct input_handler *handler = handle->handler; | |
8006479c DT |
2074 | struct input_dev *dev = handle->dev; |
2075 | int error; | |
2076 | ||
2077 | /* | |
2078 | * We take dev->mutex here to prevent race with | |
2079 | * input_release_device(). | |
2080 | */ | |
2081 | error = mutex_lock_interruptible(&dev->mutex); | |
2082 | if (error) | |
2083 | return error; | |
ef7995f4 DT |
2084 | |
2085 | /* | |
2086 | * Filters go to the head of the list, normal handlers | |
2087 | * to the tail. | |
2088 | */ | |
2089 | if (handler->filter) | |
2090 | list_add_rcu(&handle->d_node, &dev->h_list); | |
2091 | else | |
2092 | list_add_tail_rcu(&handle->d_node, &dev->h_list); | |
2093 | ||
8006479c | 2094 | mutex_unlock(&dev->mutex); |
5b2a0826 | 2095 | |
8006479c DT |
2096 | /* |
2097 | * Since we are supposed to be called from ->connect() | |
2098 | * which is mutually exclusive with ->disconnect() | |
2099 | * we can't be racing with input_unregister_handle() | |
2100 | * and so separate lock is not needed here. | |
2101 | */ | |
66d2a595 | 2102 | list_add_tail_rcu(&handle->h_node, &handler->h_list); |
5b2a0826 DT |
2103 | |
2104 | if (handler->start) | |
2105 | handler->start(handle); | |
2106 | ||
2107 | return 0; | |
2108 | } | |
2109 | EXPORT_SYMBOL(input_register_handle); | |
2110 | ||
8006479c DT |
2111 | /** |
2112 | * input_unregister_handle - unregister an input handle | |
2113 | * @handle: handle to unregister | |
2114 | * | |
2115 | * This function removes input handle from device's | |
2116 | * and handler's lists. | |
2117 | * | |
2118 | * This function is supposed to be called from handler's | |
2119 | * disconnect() method. | |
2120 | */ | |
5b2a0826 DT |
2121 | void input_unregister_handle(struct input_handle *handle) |
2122 | { | |
8006479c DT |
2123 | struct input_dev *dev = handle->dev; |
2124 | ||
66d2a595 | 2125 | list_del_rcu(&handle->h_node); |
8006479c DT |
2126 | |
2127 | /* | |
2128 | * Take dev->mutex to prevent race with input_release_device(). | |
2129 | */ | |
2130 | mutex_lock(&dev->mutex); | |
2131 | list_del_rcu(&handle->d_node); | |
2132 | mutex_unlock(&dev->mutex); | |
66d2a595 | 2133 | |
82ba56c2 | 2134 | synchronize_rcu(); |
5b2a0826 DT |
2135 | } |
2136 | EXPORT_SYMBOL(input_unregister_handle); | |
2137 | ||
1da177e4 LT |
2138 | static int input_open_file(struct inode *inode, struct file *file) |
2139 | { | |
2edbf853 | 2140 | struct input_handler *handler; |
99ac48f5 | 2141 | const struct file_operations *old_fops, *new_fops = NULL; |
1da177e4 LT |
2142 | int err; |
2143 | ||
2f2177c8 AB |
2144 | err = mutex_lock_interruptible(&input_mutex); |
2145 | if (err) | |
2146 | return err; | |
2147 | ||
1da177e4 | 2148 | /* No load-on-demand here? */ |
2edbf853 | 2149 | handler = input_table[iminor(inode) >> 5]; |
2f2177c8 AB |
2150 | if (handler) |
2151 | new_fops = fops_get(handler->fops); | |
2152 | ||
2153 | mutex_unlock(&input_mutex); | |
1da177e4 LT |
2154 | |
2155 | /* | |
2156 | * That's _really_ odd. Usually NULL ->open means "nothing special", | |
2157 | * not "no device". Oh, well... | |
2158 | */ | |
2f2177c8 | 2159 | if (!new_fops || !new_fops->open) { |
1da177e4 | 2160 | fops_put(new_fops); |
2edbf853 JC |
2161 | err = -ENODEV; |
2162 | goto out; | |
1da177e4 | 2163 | } |
2f2177c8 | 2164 | |
1da177e4 LT |
2165 | old_fops = file->f_op; |
2166 | file->f_op = new_fops; | |
2167 | ||
2168 | err = new_fops->open(inode, file); | |
1da177e4 LT |
2169 | if (err) { |
2170 | fops_put(file->f_op); | |
2171 | file->f_op = fops_get(old_fops); | |
2172 | } | |
2173 | fops_put(old_fops); | |
2edbf853 | 2174 | out: |
1da177e4 LT |
2175 | return err; |
2176 | } | |
2177 | ||
2b8693c0 | 2178 | static const struct file_operations input_fops = { |
1da177e4 LT |
2179 | .owner = THIS_MODULE, |
2180 | .open = input_open_file, | |
6038f373 | 2181 | .llseek = noop_llseek, |
1da177e4 LT |
2182 | }; |
2183 | ||
f96b434d | 2184 | static int __init input_init(void) |
1da177e4 | 2185 | { |
f96b434d | 2186 | int err; |
1da177e4 | 2187 | |
ea9f240b | 2188 | err = class_register(&input_class); |
d19fbe8a DT |
2189 | if (err) { |
2190 | printk(KERN_ERR "input: unable to register input_dev class\n"); | |
2191 | return err; | |
2192 | } | |
2193 | ||
f96b434d DT |
2194 | err = input_proc_init(); |
2195 | if (err) | |
b0fdfebb | 2196 | goto fail1; |
1da177e4 | 2197 | |
f96b434d DT |
2198 | err = register_chrdev(INPUT_MAJOR, "input", &input_fops); |
2199 | if (err) { | |
2200 | printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR); | |
b0fdfebb | 2201 | goto fail2; |
1da177e4 | 2202 | } |
e334016f | 2203 | |
1da177e4 | 2204 | return 0; |
1da177e4 | 2205 | |
b0fdfebb | 2206 | fail2: input_proc_exit(); |
ea9f240b | 2207 | fail1: class_unregister(&input_class); |
f96b434d | 2208 | return err; |
1da177e4 LT |
2209 | } |
2210 | ||
2211 | static void __exit input_exit(void) | |
2212 | { | |
f96b434d | 2213 | input_proc_exit(); |
1da177e4 | 2214 | unregister_chrdev(INPUT_MAJOR, "input"); |
ea9f240b | 2215 | class_unregister(&input_class); |
1da177e4 LT |
2216 | } |
2217 | ||
2218 | subsys_initcall(input_init); | |
2219 | module_exit(input_exit); |