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> |
15e184af | 27 | #include "input-compat.h" |
1da177e4 LT |
28 | |
29 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>"); | |
30 | MODULE_DESCRIPTION("Input core"); | |
31 | MODULE_LICENSE("GPL"); | |
32 | ||
1da177e4 LT |
33 | #define INPUT_DEVICES 256 |
34 | ||
35 | static LIST_HEAD(input_dev_list); | |
36 | static LIST_HEAD(input_handler_list); | |
37 | ||
8006479c DT |
38 | /* |
39 | * input_mutex protects access to both input_dev_list and input_handler_list. | |
40 | * This also causes input_[un]register_device and input_[un]register_handler | |
41 | * be mutually exclusive which simplifies locking in drivers implementing | |
42 | * input handlers. | |
43 | */ | |
44 | static DEFINE_MUTEX(input_mutex); | |
45 | ||
1da177e4 LT |
46 | static struct input_handler *input_table[8]; |
47 | ||
8006479c DT |
48 | static inline int is_event_supported(unsigned int code, |
49 | unsigned long *bm, unsigned int max) | |
1da177e4 | 50 | { |
8006479c DT |
51 | return code <= max && test_bit(code, bm); |
52 | } | |
1da177e4 | 53 | |
8006479c DT |
54 | static int input_defuzz_abs_event(int value, int old_val, int fuzz) |
55 | { | |
56 | if (fuzz) { | |
57 | if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2) | |
58 | return old_val; | |
1da177e4 | 59 | |
8006479c DT |
60 | if (value > old_val - fuzz && value < old_val + fuzz) |
61 | return (old_val * 3 + value) / 4; | |
1da177e4 | 62 | |
8006479c DT |
63 | if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2) |
64 | return (old_val + value) / 2; | |
65 | } | |
1da177e4 | 66 | |
8006479c DT |
67 | return value; |
68 | } | |
1da177e4 | 69 | |
8006479c | 70 | /* |
ef7995f4 DT |
71 | * Pass event first through all filters and then, if event has not been |
72 | * filtered out, through all open handles. This function is called with | |
82ba56c2 | 73 | * dev->event_lock held and interrupts disabled. |
8006479c DT |
74 | */ |
75 | static void input_pass_event(struct input_dev *dev, | |
5fdbe44d | 76 | struct input_handler *src_handler, |
8006479c DT |
77 | unsigned int type, unsigned int code, int value) |
78 | { | |
ef7995f4 | 79 | struct input_handler *handler; |
82ba56c2 DT |
80 | struct input_handle *handle; |
81 | ||
82 | rcu_read_lock(); | |
1da177e4 | 83 | |
82ba56c2 | 84 | handle = rcu_dereference(dev->grab); |
8006479c DT |
85 | if (handle) |
86 | handle->handler->event(handle, type, code, value); | |
ef7995f4 DT |
87 | else { |
88 | bool filtered = false; | |
89 | ||
90 | list_for_each_entry_rcu(handle, &dev->h_list, d_node) { | |
91 | if (!handle->open) | |
92 | continue; | |
93 | ||
94 | handler = handle->handler; | |
5fdbe44d DT |
95 | |
96 | /* | |
97 | * If this is the handler that injected this | |
98 | * particular event we want to skip it to avoid | |
99 | * filters firing again and again. | |
100 | */ | |
101 | if (handler == src_handler) | |
102 | continue; | |
103 | ||
ef7995f4 DT |
104 | if (!handler->filter) { |
105 | if (filtered) | |
106 | break; | |
107 | ||
108 | handler->event(handle, type, code, value); | |
109 | ||
110 | } else if (handler->filter(handle, type, code, value)) | |
111 | filtered = true; | |
112 | } | |
113 | } | |
114 | ||
82ba56c2 | 115 | rcu_read_unlock(); |
8006479c | 116 | } |
1da177e4 | 117 | |
8006479c DT |
118 | /* |
119 | * Generate software autorepeat event. Note that we take | |
120 | * dev->event_lock here to avoid racing with input_event | |
121 | * which may cause keys get "stuck". | |
122 | */ | |
123 | static void input_repeat_key(unsigned long data) | |
124 | { | |
125 | struct input_dev *dev = (void *) data; | |
126 | unsigned long flags; | |
1da177e4 | 127 | |
8006479c | 128 | spin_lock_irqsave(&dev->event_lock, flags); |
1da177e4 | 129 | |
8006479c DT |
130 | if (test_bit(dev->repeat_key, dev->key) && |
131 | is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) { | |
1da177e4 | 132 | |
5fdbe44d | 133 | input_pass_event(dev, NULL, EV_KEY, dev->repeat_key, 2); |
1da177e4 | 134 | |
8006479c DT |
135 | if (dev->sync) { |
136 | /* | |
137 | * Only send SYN_REPORT if we are not in a middle | |
138 | * of driver parsing a new hardware packet. | |
139 | * Otherwise assume that the driver will send | |
140 | * SYN_REPORT once it's done. | |
141 | */ | |
5fdbe44d | 142 | input_pass_event(dev, NULL, EV_SYN, SYN_REPORT, 1); |
8006479c | 143 | } |
31581066 | 144 | |
8006479c DT |
145 | if (dev->rep[REP_PERIOD]) |
146 | mod_timer(&dev->timer, jiffies + | |
147 | msecs_to_jiffies(dev->rep[REP_PERIOD])); | |
148 | } | |
31581066 | 149 | |
8006479c DT |
150 | spin_unlock_irqrestore(&dev->event_lock, flags); |
151 | } | |
31581066 | 152 | |
8006479c DT |
153 | static void input_start_autorepeat(struct input_dev *dev, int code) |
154 | { | |
155 | if (test_bit(EV_REP, dev->evbit) && | |
156 | dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && | |
157 | dev->timer.data) { | |
158 | dev->repeat_key = code; | |
159 | mod_timer(&dev->timer, | |
160 | jiffies + msecs_to_jiffies(dev->rep[REP_DELAY])); | |
161 | } | |
162 | } | |
31581066 | 163 | |
e7b5c1ef JB |
164 | static void input_stop_autorepeat(struct input_dev *dev) |
165 | { | |
166 | del_timer(&dev->timer); | |
167 | } | |
168 | ||
8006479c DT |
169 | #define INPUT_IGNORE_EVENT 0 |
170 | #define INPUT_PASS_TO_HANDLERS 1 | |
171 | #define INPUT_PASS_TO_DEVICE 2 | |
172 | #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE) | |
1da177e4 | 173 | |
40d007e7 | 174 | static int input_handle_abs_event(struct input_dev *dev, |
5fdbe44d | 175 | struct input_handler *src_handler, |
40d007e7 HR |
176 | unsigned int code, int *pval) |
177 | { | |
178 | bool is_mt_event; | |
179 | int *pold; | |
180 | ||
181 | if (code == ABS_MT_SLOT) { | |
182 | /* | |
183 | * "Stage" the event; we'll flush it later, when we | |
144c0f88 | 184 | * get actual touch data. |
40d007e7 HR |
185 | */ |
186 | if (*pval >= 0 && *pval < dev->mtsize) | |
187 | dev->slot = *pval; | |
188 | ||
189 | return INPUT_IGNORE_EVENT; | |
190 | } | |
191 | ||
192 | is_mt_event = code >= ABS_MT_FIRST && code <= ABS_MT_LAST; | |
193 | ||
194 | if (!is_mt_event) { | |
d31b2865 | 195 | pold = &dev->absinfo[code].value; |
40d007e7 HR |
196 | } else if (dev->mt) { |
197 | struct input_mt_slot *mtslot = &dev->mt[dev->slot]; | |
198 | pold = &mtslot->abs[code - ABS_MT_FIRST]; | |
199 | } else { | |
200 | /* | |
144c0f88 | 201 | * Bypass filtering for multi-touch events when |
40d007e7 HR |
202 | * not employing slots. |
203 | */ | |
204 | pold = NULL; | |
205 | } | |
206 | ||
207 | if (pold) { | |
208 | *pval = input_defuzz_abs_event(*pval, *pold, | |
d31b2865 | 209 | dev->absinfo[code].fuzz); |
40d007e7 HR |
210 | if (*pold == *pval) |
211 | return INPUT_IGNORE_EVENT; | |
212 | ||
213 | *pold = *pval; | |
214 | } | |
215 | ||
216 | /* Flush pending "slot" event */ | |
987a6c02 DM |
217 | if (is_mt_event && dev->slot != input_abs_get_val(dev, ABS_MT_SLOT)) { |
218 | input_abs_set_val(dev, ABS_MT_SLOT, dev->slot); | |
5fdbe44d DT |
219 | input_pass_event(dev, src_handler, |
220 | EV_ABS, ABS_MT_SLOT, dev->slot); | |
40d007e7 HR |
221 | } |
222 | ||
223 | return INPUT_PASS_TO_HANDLERS; | |
224 | } | |
225 | ||
8006479c | 226 | static void input_handle_event(struct input_dev *dev, |
5fdbe44d | 227 | struct input_handler *src_handler, |
8006479c DT |
228 | unsigned int type, unsigned int code, int value) |
229 | { | |
230 | int disposition = INPUT_IGNORE_EVENT; | |
1da177e4 | 231 | |
8006479c | 232 | switch (type) { |
1da177e4 | 233 | |
8006479c DT |
234 | case EV_SYN: |
235 | switch (code) { | |
236 | case SYN_CONFIG: | |
237 | disposition = INPUT_PASS_TO_ALL; | |
238 | break; | |
1da177e4 | 239 | |
8006479c DT |
240 | case SYN_REPORT: |
241 | if (!dev->sync) { | |
20da92de | 242 | dev->sync = true; |
8006479c | 243 | disposition = INPUT_PASS_TO_HANDLERS; |
1da177e4 | 244 | } |
1da177e4 | 245 | break; |
5e5ee686 | 246 | case SYN_MT_REPORT: |
20da92de | 247 | dev->sync = false; |
5e5ee686 HR |
248 | disposition = INPUT_PASS_TO_HANDLERS; |
249 | break; | |
8006479c DT |
250 | } |
251 | break; | |
1da177e4 | 252 | |
8006479c DT |
253 | case EV_KEY: |
254 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
255 | !!test_bit(code, dev->key) != value) { | |
1da177e4 | 256 | |
8006479c DT |
257 | if (value != 2) { |
258 | __change_bit(code, dev->key); | |
259 | if (value) | |
260 | input_start_autorepeat(dev, code); | |
e7b5c1ef JB |
261 | else |
262 | input_stop_autorepeat(dev); | |
8006479c | 263 | } |
1da177e4 | 264 | |
8006479c DT |
265 | disposition = INPUT_PASS_TO_HANDLERS; |
266 | } | |
267 | break; | |
1da177e4 | 268 | |
8006479c DT |
269 | case EV_SW: |
270 | if (is_event_supported(code, dev->swbit, SW_MAX) && | |
271 | !!test_bit(code, dev->sw) != value) { | |
1da177e4 | 272 | |
8006479c DT |
273 | __change_bit(code, dev->sw); |
274 | disposition = INPUT_PASS_TO_HANDLERS; | |
275 | } | |
276 | break; | |
1da177e4 | 277 | |
8006479c | 278 | case EV_ABS: |
40d007e7 | 279 | if (is_event_supported(code, dev->absbit, ABS_MAX)) |
5fdbe44d DT |
280 | disposition = input_handle_abs_event(dev, src_handler, |
281 | code, &value); | |
61994a61 | 282 | |
8006479c | 283 | break; |
1da177e4 | 284 | |
8006479c DT |
285 | case EV_REL: |
286 | if (is_event_supported(code, dev->relbit, REL_MAX) && value) | |
287 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 288 | |
8006479c | 289 | break; |
1e0afb28 | 290 | |
8006479c DT |
291 | case EV_MSC: |
292 | if (is_event_supported(code, dev->mscbit, MSC_MAX)) | |
293 | disposition = INPUT_PASS_TO_ALL; | |
1da177e4 | 294 | |
8006479c | 295 | break; |
1da177e4 | 296 | |
8006479c DT |
297 | case EV_LED: |
298 | if (is_event_supported(code, dev->ledbit, LED_MAX) && | |
299 | !!test_bit(code, dev->led) != value) { | |
1da177e4 | 300 | |
8006479c DT |
301 | __change_bit(code, dev->led); |
302 | disposition = INPUT_PASS_TO_ALL; | |
303 | } | |
304 | break; | |
305 | ||
306 | case EV_SND: | |
307 | if (is_event_supported(code, dev->sndbit, SND_MAX)) { | |
1da177e4 | 308 | |
8fdc1948 | 309 | if (!!test_bit(code, dev->snd) != !!value) |
8006479c DT |
310 | __change_bit(code, dev->snd); |
311 | disposition = INPUT_PASS_TO_ALL; | |
312 | } | |
313 | break; | |
8fdc1948 | 314 | |
8006479c DT |
315 | case EV_REP: |
316 | if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) { | |
317 | dev->rep[code] = value; | |
318 | disposition = INPUT_PASS_TO_ALL; | |
319 | } | |
320 | break; | |
1da177e4 | 321 | |
8006479c DT |
322 | case EV_FF: |
323 | if (value >= 0) | |
324 | disposition = INPUT_PASS_TO_ALL; | |
325 | break; | |
ed2fa4dd RP |
326 | |
327 | case EV_PWR: | |
328 | disposition = INPUT_PASS_TO_ALL; | |
329 | break; | |
8006479c | 330 | } |
1da177e4 | 331 | |
c9812282 | 332 | if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN) |
20da92de | 333 | dev->sync = false; |
1da177e4 | 334 | |
8006479c DT |
335 | if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event) |
336 | dev->event(dev, type, code, value); | |
1da177e4 | 337 | |
8006479c | 338 | if (disposition & INPUT_PASS_TO_HANDLERS) |
5fdbe44d | 339 | input_pass_event(dev, src_handler, type, code, value); |
8006479c | 340 | } |
1da177e4 | 341 | |
8006479c DT |
342 | /** |
343 | * input_event() - report new input event | |
344 | * @dev: device that generated the event | |
345 | * @type: type of the event | |
346 | * @code: event code | |
347 | * @value: value of the event | |
348 | * | |
349 | * This function should be used by drivers implementing various input | |
df2d4637 DT |
350 | * devices to report input events. See also input_inject_event(). |
351 | * | |
352 | * NOTE: input_event() may be safely used right after input device was | |
353 | * allocated with input_allocate_device(), even before it is registered | |
354 | * with input_register_device(), but the event will not reach any of the | |
355 | * input handlers. Such early invocation of input_event() may be used | |
356 | * to 'seed' initial state of a switch or initial position of absolute | |
357 | * axis, etc. | |
8006479c | 358 | */ |
8006479c DT |
359 | void input_event(struct input_dev *dev, |
360 | unsigned int type, unsigned int code, int value) | |
361 | { | |
362 | unsigned long flags; | |
509ca1a9 | 363 | |
8006479c | 364 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
509ca1a9 | 365 | |
8006479c DT |
366 | spin_lock_irqsave(&dev->event_lock, flags); |
367 | add_input_randomness(type, code, value); | |
5fdbe44d | 368 | input_handle_event(dev, NULL, type, code, value); |
8006479c | 369 | spin_unlock_irqrestore(&dev->event_lock, flags); |
1da177e4 | 370 | } |
1da177e4 | 371 | } |
ca56fe07 | 372 | EXPORT_SYMBOL(input_event); |
1da177e4 | 373 | |
0e739d28 DT |
374 | /** |
375 | * input_inject_event() - send input event from input handler | |
376 | * @handle: input handle to send event through | |
377 | * @type: type of the event | |
378 | * @code: event code | |
379 | * @value: value of the event | |
380 | * | |
8006479c DT |
381 | * Similar to input_event() but will ignore event if device is |
382 | * "grabbed" and handle injecting event is not the one that owns | |
383 | * the device. | |
0e739d28 | 384 | */ |
8006479c DT |
385 | void input_inject_event(struct input_handle *handle, |
386 | unsigned int type, unsigned int code, int value) | |
1da177e4 | 387 | { |
8006479c DT |
388 | struct input_dev *dev = handle->dev; |
389 | struct input_handle *grab; | |
390 | unsigned long flags; | |
1da177e4 | 391 | |
8006479c DT |
392 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
393 | spin_lock_irqsave(&dev->event_lock, flags); | |
1da177e4 | 394 | |
82ba56c2 | 395 | rcu_read_lock(); |
8006479c DT |
396 | grab = rcu_dereference(dev->grab); |
397 | if (!grab || grab == handle) | |
5fdbe44d DT |
398 | input_handle_event(dev, handle->handler, |
399 | type, code, value); | |
82ba56c2 | 400 | rcu_read_unlock(); |
1da177e4 | 401 | |
8006479c DT |
402 | spin_unlock_irqrestore(&dev->event_lock, flags); |
403 | } | |
1da177e4 | 404 | } |
8006479c | 405 | EXPORT_SYMBOL(input_inject_event); |
1da177e4 | 406 | |
d31b2865 DM |
407 | /** |
408 | * input_alloc_absinfo - allocates array of input_absinfo structs | |
409 | * @dev: the input device emitting absolute events | |
410 | * | |
411 | * If the absinfo struct the caller asked for is already allocated, this | |
412 | * functions will not do anything. | |
413 | */ | |
414 | void input_alloc_absinfo(struct input_dev *dev) | |
415 | { | |
416 | if (!dev->absinfo) | |
417 | dev->absinfo = kcalloc(ABS_CNT, sizeof(struct input_absinfo), | |
418 | GFP_KERNEL); | |
419 | ||
420 | WARN(!dev->absinfo, "%s(): kcalloc() failed?\n", __func__); | |
421 | } | |
422 | EXPORT_SYMBOL(input_alloc_absinfo); | |
423 | ||
424 | void input_set_abs_params(struct input_dev *dev, unsigned int axis, | |
425 | int min, int max, int fuzz, int flat) | |
426 | { | |
427 | struct input_absinfo *absinfo; | |
428 | ||
429 | input_alloc_absinfo(dev); | |
430 | if (!dev->absinfo) | |
431 | return; | |
432 | ||
433 | absinfo = &dev->absinfo[axis]; | |
434 | absinfo->minimum = min; | |
435 | absinfo->maximum = max; | |
436 | absinfo->fuzz = fuzz; | |
437 | absinfo->flat = flat; | |
438 | ||
439 | dev->absbit[BIT_WORD(axis)] |= BIT_MASK(axis); | |
440 | } | |
441 | EXPORT_SYMBOL(input_set_abs_params); | |
442 | ||
443 | ||
8006479c DT |
444 | /** |
445 | * input_grab_device - grabs device for exclusive use | |
446 | * @handle: input handle that wants to own the device | |
447 | * | |
448 | * When a device is grabbed by an input handle all events generated by | |
449 | * the device are delivered only to this handle. Also events injected | |
450 | * by other input handles are ignored while device is grabbed. | |
451 | */ | |
1da177e4 LT |
452 | int input_grab_device(struct input_handle *handle) |
453 | { | |
8006479c DT |
454 | struct input_dev *dev = handle->dev; |
455 | int retval; | |
1da177e4 | 456 | |
8006479c DT |
457 | retval = mutex_lock_interruptible(&dev->mutex); |
458 | if (retval) | |
459 | return retval; | |
460 | ||
461 | if (dev->grab) { | |
462 | retval = -EBUSY; | |
463 | goto out; | |
464 | } | |
465 | ||
466 | rcu_assign_pointer(dev->grab, handle); | |
82ba56c2 | 467 | synchronize_rcu(); |
8006479c DT |
468 | |
469 | out: | |
470 | mutex_unlock(&dev->mutex); | |
471 | return retval; | |
1da177e4 | 472 | } |
ca56fe07 | 473 | EXPORT_SYMBOL(input_grab_device); |
1da177e4 | 474 | |
8006479c | 475 | static void __input_release_device(struct input_handle *handle) |
1da177e4 | 476 | { |
a2b2ed2c | 477 | struct input_dev *dev = handle->dev; |
c7e8dc6e | 478 | |
a2b2ed2c | 479 | if (dev->grab == handle) { |
8006479c DT |
480 | rcu_assign_pointer(dev->grab, NULL); |
481 | /* Make sure input_pass_event() notices that grab is gone */ | |
82ba56c2 | 482 | synchronize_rcu(); |
a2b2ed2c AM |
483 | |
484 | list_for_each_entry(handle, &dev->h_list, d_node) | |
8006479c | 485 | if (handle->open && handle->handler->start) |
c7e8dc6e DT |
486 | handle->handler->start(handle); |
487 | } | |
1da177e4 | 488 | } |
8006479c DT |
489 | |
490 | /** | |
491 | * input_release_device - release previously grabbed device | |
492 | * @handle: input handle that owns the device | |
493 | * | |
494 | * Releases previously grabbed device so that other input handles can | |
495 | * start receiving input events. Upon release all handlers attached | |
496 | * to the device have their start() method called so they have a change | |
497 | * to synchronize device state with the rest of the system. | |
498 | */ | |
499 | void input_release_device(struct input_handle *handle) | |
500 | { | |
501 | struct input_dev *dev = handle->dev; | |
502 | ||
503 | mutex_lock(&dev->mutex); | |
504 | __input_release_device(handle); | |
505 | mutex_unlock(&dev->mutex); | |
506 | } | |
ca56fe07 | 507 | EXPORT_SYMBOL(input_release_device); |
1da177e4 | 508 | |
8006479c DT |
509 | /** |
510 | * input_open_device - open input device | |
511 | * @handle: handle through which device is being accessed | |
512 | * | |
513 | * This function should be called by input handlers when they | |
514 | * want to start receive events from given input device. | |
515 | */ | |
1da177e4 LT |
516 | int input_open_device(struct input_handle *handle) |
517 | { | |
0fbf87ca | 518 | struct input_dev *dev = handle->dev; |
8006479c | 519 | int retval; |
0fbf87ca | 520 | |
8006479c DT |
521 | retval = mutex_lock_interruptible(&dev->mutex); |
522 | if (retval) | |
523 | return retval; | |
524 | ||
525 | if (dev->going_away) { | |
526 | retval = -ENODEV; | |
527 | goto out; | |
528 | } | |
0fbf87ca | 529 | |
1da177e4 | 530 | handle->open++; |
0fbf87ca DT |
531 | |
532 | if (!dev->users++ && dev->open) | |
8006479c DT |
533 | retval = dev->open(dev); |
534 | ||
535 | if (retval) { | |
536 | dev->users--; | |
537 | if (!--handle->open) { | |
538 | /* | |
539 | * Make sure we are not delivering any more events | |
540 | * through this handle | |
541 | */ | |
82ba56c2 | 542 | synchronize_rcu(); |
8006479c DT |
543 | } |
544 | } | |
0fbf87ca | 545 | |
8006479c | 546 | out: |
e676c232 | 547 | mutex_unlock(&dev->mutex); |
8006479c | 548 | return retval; |
1da177e4 | 549 | } |
ca56fe07 | 550 | EXPORT_SYMBOL(input_open_device); |
1da177e4 | 551 | |
8006479c | 552 | int input_flush_device(struct input_handle *handle, struct file *file) |
1da177e4 | 553 | { |
8006479c DT |
554 | struct input_dev *dev = handle->dev; |
555 | int retval; | |
1da177e4 | 556 | |
8006479c DT |
557 | retval = mutex_lock_interruptible(&dev->mutex); |
558 | if (retval) | |
559 | return retval; | |
560 | ||
561 | if (dev->flush) | |
562 | retval = dev->flush(dev, file); | |
563 | ||
564 | mutex_unlock(&dev->mutex); | |
565 | return retval; | |
1da177e4 | 566 | } |
ca56fe07 | 567 | EXPORT_SYMBOL(input_flush_device); |
1da177e4 | 568 | |
8006479c DT |
569 | /** |
570 | * input_close_device - close input device | |
571 | * @handle: handle through which device is being accessed | |
572 | * | |
573 | * This function should be called by input handlers when they | |
574 | * want to stop receive events from given input device. | |
575 | */ | |
1da177e4 LT |
576 | void input_close_device(struct input_handle *handle) |
577 | { | |
0fbf87ca DT |
578 | struct input_dev *dev = handle->dev; |
579 | ||
e676c232 | 580 | mutex_lock(&dev->mutex); |
0fbf87ca | 581 | |
8006479c DT |
582 | __input_release_device(handle); |
583 | ||
0fbf87ca DT |
584 | if (!--dev->users && dev->close) |
585 | dev->close(dev); | |
8006479c DT |
586 | |
587 | if (!--handle->open) { | |
588 | /* | |
82ba56c2 | 589 | * synchronize_rcu() makes sure that input_pass_event() |
8006479c DT |
590 | * completed and that no more input events are delivered |
591 | * through this handle | |
592 | */ | |
82ba56c2 | 593 | synchronize_rcu(); |
8006479c | 594 | } |
0fbf87ca | 595 | |
e676c232 | 596 | mutex_unlock(&dev->mutex); |
1da177e4 | 597 | } |
ca56fe07 | 598 | EXPORT_SYMBOL(input_close_device); |
1da177e4 | 599 | |
866d7d7b ON |
600 | /* |
601 | * Simulate keyup events for all keys that are marked as pressed. | |
602 | * The function must be called with dev->event_lock held. | |
603 | */ | |
604 | static void input_dev_release_keys(struct input_dev *dev) | |
605 | { | |
606 | int code; | |
607 | ||
608 | if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) { | |
609 | for (code = 0; code <= KEY_MAX; code++) { | |
610 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
611 | __test_and_clear_bit(code, dev->key)) { | |
5fdbe44d | 612 | input_pass_event(dev, NULL, EV_KEY, code, 0); |
866d7d7b ON |
613 | } |
614 | } | |
5fdbe44d | 615 | input_pass_event(dev, NULL, EV_SYN, SYN_REPORT, 1); |
866d7d7b ON |
616 | } |
617 | } | |
618 | ||
8006479c DT |
619 | /* |
620 | * Prepare device for unregistering | |
621 | */ | |
622 | static void input_disconnect_device(struct input_dev *dev) | |
623 | { | |
624 | struct input_handle *handle; | |
8006479c DT |
625 | |
626 | /* | |
627 | * Mark device as going away. Note that we take dev->mutex here | |
628 | * not to protect access to dev->going_away but rather to ensure | |
629 | * that there are no threads in the middle of input_open_device() | |
630 | */ | |
631 | mutex_lock(&dev->mutex); | |
ffd0db97 | 632 | dev->going_away = true; |
8006479c DT |
633 | mutex_unlock(&dev->mutex); |
634 | ||
635 | spin_lock_irq(&dev->event_lock); | |
636 | ||
637 | /* | |
638 | * Simulate keyup events for all pressed keys so that handlers | |
639 | * are not left with "stuck" keys. The driver may continue | |
640 | * generate events even after we done here but they will not | |
641 | * reach any handlers. | |
642 | */ | |
866d7d7b | 643 | input_dev_release_keys(dev); |
8006479c DT |
644 | |
645 | list_for_each_entry(handle, &dev->h_list, d_node) | |
646 | handle->open = 0; | |
647 | ||
648 | spin_unlock_irq(&dev->event_lock); | |
649 | } | |
650 | ||
8613e4c2 MCC |
651 | /** |
652 | * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry | |
653 | * @ke: keymap entry containing scancode to be converted. | |
654 | * @scancode: pointer to the location where converted scancode should | |
655 | * be stored. | |
656 | * | |
657 | * This function is used to convert scancode stored in &struct keymap_entry | |
658 | * into scalar form understood by legacy keymap handling methods. These | |
659 | * methods expect scancodes to be represented as 'unsigned int'. | |
660 | */ | |
661 | int input_scancode_to_scalar(const struct input_keymap_entry *ke, | |
662 | unsigned int *scancode) | |
663 | { | |
664 | switch (ke->len) { | |
665 | case 1: | |
666 | *scancode = *((u8 *)ke->scancode); | |
667 | break; | |
668 | ||
669 | case 2: | |
670 | *scancode = *((u16 *)ke->scancode); | |
671 | break; | |
672 | ||
673 | case 4: | |
674 | *scancode = *((u32 *)ke->scancode); | |
675 | break; | |
676 | ||
677 | default: | |
678 | return -EINVAL; | |
679 | } | |
680 | ||
681 | return 0; | |
682 | } | |
683 | EXPORT_SYMBOL(input_scancode_to_scalar); | |
684 | ||
685 | /* | |
686 | * Those routines handle the default case where no [gs]etkeycode() is | |
687 | * defined. In this case, an array indexed by the scancode is used. | |
688 | */ | |
689 | ||
690 | static unsigned int input_fetch_keycode(struct input_dev *dev, | |
691 | unsigned int index) | |
c8e4c772 MR |
692 | { |
693 | switch (dev->keycodesize) { | |
8613e4c2 MCC |
694 | case 1: |
695 | return ((u8 *)dev->keycode)[index]; | |
c8e4c772 | 696 | |
8613e4c2 MCC |
697 | case 2: |
698 | return ((u16 *)dev->keycode)[index]; | |
c8e4c772 | 699 | |
8613e4c2 MCC |
700 | default: |
701 | return ((u32 *)dev->keycode)[index]; | |
c8e4c772 MR |
702 | } |
703 | } | |
704 | ||
705 | static int input_default_getkeycode(struct input_dev *dev, | |
8613e4c2 | 706 | struct input_keymap_entry *ke) |
c8e4c772 | 707 | { |
8613e4c2 MCC |
708 | unsigned int index; |
709 | int error; | |
710 | ||
c8e4c772 MR |
711 | if (!dev->keycodesize) |
712 | return -EINVAL; | |
713 | ||
8613e4c2 MCC |
714 | if (ke->flags & INPUT_KEYMAP_BY_INDEX) |
715 | index = ke->index; | |
716 | else { | |
717 | error = input_scancode_to_scalar(ke, &index); | |
718 | if (error) | |
719 | return error; | |
720 | } | |
721 | ||
722 | if (index >= dev->keycodemax) | |
c8e4c772 MR |
723 | return -EINVAL; |
724 | ||
8613e4c2 MCC |
725 | ke->keycode = input_fetch_keycode(dev, index); |
726 | ke->index = index; | |
727 | ke->len = sizeof(index); | |
728 | memcpy(ke->scancode, &index, sizeof(index)); | |
c8e4c772 MR |
729 | |
730 | return 0; | |
731 | } | |
732 | ||
733 | static int input_default_setkeycode(struct input_dev *dev, | |
8613e4c2 MCC |
734 | const struct input_keymap_entry *ke, |
735 | unsigned int *old_keycode) | |
c8e4c772 | 736 | { |
8613e4c2 MCC |
737 | unsigned int index; |
738 | int error; | |
c8e4c772 MR |
739 | int i; |
740 | ||
8613e4c2 | 741 | if (!dev->keycodesize) |
c8e4c772 MR |
742 | return -EINVAL; |
743 | ||
8613e4c2 MCC |
744 | if (ke->flags & INPUT_KEYMAP_BY_INDEX) { |
745 | index = ke->index; | |
746 | } else { | |
747 | error = input_scancode_to_scalar(ke, &index); | |
748 | if (error) | |
749 | return error; | |
750 | } | |
751 | ||
752 | if (index >= dev->keycodemax) | |
c8e4c772 MR |
753 | return -EINVAL; |
754 | ||
de391d12 | 755 | if (dev->keycodesize < sizeof(ke->keycode) && |
8613e4c2 | 756 | (ke->keycode >> (dev->keycodesize * 8))) |
c8e4c772 MR |
757 | return -EINVAL; |
758 | ||
759 | switch (dev->keycodesize) { | |
760 | case 1: { | |
761 | u8 *k = (u8 *)dev->keycode; | |
8613e4c2 MCC |
762 | *old_keycode = k[index]; |
763 | k[index] = ke->keycode; | |
c8e4c772 MR |
764 | break; |
765 | } | |
766 | case 2: { | |
767 | u16 *k = (u16 *)dev->keycode; | |
8613e4c2 MCC |
768 | *old_keycode = k[index]; |
769 | k[index] = ke->keycode; | |
c8e4c772 MR |
770 | break; |
771 | } | |
772 | default: { | |
773 | u32 *k = (u32 *)dev->keycode; | |
8613e4c2 MCC |
774 | *old_keycode = k[index]; |
775 | k[index] = ke->keycode; | |
c8e4c772 MR |
776 | break; |
777 | } | |
778 | } | |
779 | ||
8613e4c2 MCC |
780 | __clear_bit(*old_keycode, dev->keybit); |
781 | __set_bit(ke->keycode, dev->keybit); | |
c8e4c772 MR |
782 | |
783 | for (i = 0; i < dev->keycodemax; i++) { | |
8613e4c2 MCC |
784 | if (input_fetch_keycode(dev, i) == *old_keycode) { |
785 | __set_bit(*old_keycode, dev->keybit); | |
c8e4c772 MR |
786 | break; /* Setting the bit twice is useless, so break */ |
787 | } | |
788 | } | |
789 | ||
790 | return 0; | |
791 | } | |
792 | ||
f4f37c8e DT |
793 | /** |
794 | * input_get_keycode - retrieve keycode currently mapped to a given scancode | |
795 | * @dev: input device which keymap is being queried | |
8613e4c2 | 796 | * @ke: keymap entry |
f4f37c8e DT |
797 | * |
798 | * This function should be called by anyone interested in retrieving current | |
8613e4c2 | 799 | * keymap. Presently evdev handlers use it. |
f4f37c8e | 800 | */ |
8613e4c2 | 801 | int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke) |
f4f37c8e | 802 | { |
2e2e3b96 DT |
803 | unsigned long flags; |
804 | int retval; | |
805 | ||
806 | spin_lock_irqsave(&dev->event_lock, flags); | |
2e2e3b96 | 807 | |
8613e4c2 MCC |
808 | if (dev->getkeycode) { |
809 | /* | |
810 | * Support for legacy drivers, that don't implement the new | |
811 | * ioctls | |
812 | */ | |
813 | u32 scancode = ke->index; | |
814 | ||
815 | memcpy(ke->scancode, &scancode, sizeof(scancode)); | |
816 | ke->len = sizeof(scancode); | |
817 | retval = dev->getkeycode(dev, scancode, &ke->keycode); | |
818 | } else { | |
819 | retval = dev->getkeycode_new(dev, ke); | |
820 | } | |
821 | ||
822 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
2e2e3b96 | 823 | return retval; |
f4f37c8e DT |
824 | } |
825 | EXPORT_SYMBOL(input_get_keycode); | |
826 | ||
827 | /** | |
8613e4c2 | 828 | * input_set_keycode - attribute a keycode to a given scancode |
f4f37c8e | 829 | * @dev: input device which keymap is being updated |
8613e4c2 | 830 | * @ke: new keymap entry |
f4f37c8e DT |
831 | * |
832 | * This function should be called by anyone needing to update current | |
833 | * keymap. Presently keyboard and evdev handlers use it. | |
834 | */ | |
58b93995 | 835 | int input_set_keycode(struct input_dev *dev, |
8613e4c2 | 836 | const struct input_keymap_entry *ke) |
f4f37c8e DT |
837 | { |
838 | unsigned long flags; | |
fd6cf3dd | 839 | unsigned int old_keycode; |
f4f37c8e DT |
840 | int retval; |
841 | ||
8613e4c2 | 842 | if (ke->keycode > KEY_MAX) |
f4f37c8e DT |
843 | return -EINVAL; |
844 | ||
845 | spin_lock_irqsave(&dev->event_lock, flags); | |
846 | ||
8613e4c2 MCC |
847 | if (dev->setkeycode) { |
848 | /* | |
849 | * Support for legacy drivers, that don't implement the new | |
850 | * ioctls | |
851 | */ | |
852 | unsigned int scancode; | |
853 | ||
854 | retval = input_scancode_to_scalar(ke, &scancode); | |
855 | if (retval) | |
856 | goto out; | |
857 | ||
858 | /* | |
859 | * We need to know the old scancode, in order to generate a | |
860 | * keyup effect, if the set operation happens successfully | |
861 | */ | |
862 | if (!dev->getkeycode) { | |
863 | retval = -EINVAL; | |
864 | goto out; | |
865 | } | |
866 | ||
867 | retval = dev->getkeycode(dev, scancode, &old_keycode); | |
868 | if (retval) | |
869 | goto out; | |
870 | ||
871 | retval = dev->setkeycode(dev, scancode, ke->keycode); | |
872 | } else { | |
873 | retval = dev->setkeycode_new(dev, ke, &old_keycode); | |
874 | } | |
f4f37c8e | 875 | |
f4f37c8e DT |
876 | if (retval) |
877 | goto out; | |
878 | ||
4f93df40 DT |
879 | /* Make sure KEY_RESERVED did not get enabled. */ |
880 | __clear_bit(KEY_RESERVED, dev->keybit); | |
881 | ||
f4f37c8e DT |
882 | /* |
883 | * Simulate keyup event if keycode is not present | |
884 | * in the keymap anymore | |
885 | */ | |
886 | if (test_bit(EV_KEY, dev->evbit) && | |
887 | !is_event_supported(old_keycode, dev->keybit, KEY_MAX) && | |
888 | __test_and_clear_bit(old_keycode, dev->key)) { | |
889 | ||
5fdbe44d | 890 | input_pass_event(dev, NULL, EV_KEY, old_keycode, 0); |
f4f37c8e | 891 | if (dev->sync) |
5fdbe44d | 892 | input_pass_event(dev, NULL, EV_SYN, SYN_REPORT, 1); |
f4f37c8e DT |
893 | } |
894 | ||
895 | out: | |
896 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
897 | ||
898 | return retval; | |
899 | } | |
900 | EXPORT_SYMBOL(input_set_keycode); | |
c8e4c772 | 901 | |
1da177e4 | 902 | #define MATCH_BIT(bit, max) \ |
7b19ada2 | 903 | for (i = 0; i < BITS_TO_LONGS(max); i++) \ |
1da177e4 LT |
904 | if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \ |
905 | break; \ | |
7b19ada2 | 906 | if (i != BITS_TO_LONGS(max)) \ |
1da177e4 LT |
907 | continue; |
908 | ||
0b7024ac | 909 | static const struct input_device_id *input_match_device(struct input_handler *handler, |
66e66118 | 910 | struct input_dev *dev) |
1da177e4 | 911 | { |
0b7024ac | 912 | const struct input_device_id *id; |
1da177e4 LT |
913 | int i; |
914 | ||
0b7024ac | 915 | for (id = handler->id_table; id->flags || id->driver_info; id++) { |
1da177e4 LT |
916 | |
917 | if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) | |
ddc5d341 | 918 | if (id->bustype != dev->id.bustype) |
1da177e4 LT |
919 | continue; |
920 | ||
921 | if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) | |
ddc5d341 | 922 | if (id->vendor != dev->id.vendor) |
1da177e4 LT |
923 | continue; |
924 | ||
925 | if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) | |
ddc5d341 | 926 | if (id->product != dev->id.product) |
1da177e4 LT |
927 | continue; |
928 | ||
929 | if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) | |
ddc5d341 | 930 | if (id->version != dev->id.version) |
1da177e4 LT |
931 | continue; |
932 | ||
933 | MATCH_BIT(evbit, EV_MAX); | |
934 | MATCH_BIT(keybit, KEY_MAX); | |
935 | MATCH_BIT(relbit, REL_MAX); | |
936 | MATCH_BIT(absbit, ABS_MAX); | |
937 | MATCH_BIT(mscbit, MSC_MAX); | |
938 | MATCH_BIT(ledbit, LED_MAX); | |
939 | MATCH_BIT(sndbit, SND_MAX); | |
940 | MATCH_BIT(ffbit, FF_MAX); | |
ff13f98b | 941 | MATCH_BIT(swbit, SW_MAX); |
1da177e4 | 942 | |
0b7024ac DT |
943 | if (!handler->match || handler->match(handler, dev)) |
944 | return id; | |
1da177e4 LT |
945 | } |
946 | ||
947 | return NULL; | |
948 | } | |
949 | ||
5b2a0826 DT |
950 | static int input_attach_handler(struct input_dev *dev, struct input_handler *handler) |
951 | { | |
952 | const struct input_device_id *id; | |
953 | int error; | |
954 | ||
0b7024ac | 955 | id = input_match_device(handler, dev); |
5b2a0826 DT |
956 | if (!id) |
957 | return -ENODEV; | |
958 | ||
959 | error = handler->connect(handler, dev, id); | |
960 | if (error && error != -ENODEV) | |
961 | printk(KERN_ERR | |
962 | "input: failed to attach handler %s to device %s, " | |
963 | "error: %d\n", | |
9657d75c | 964 | handler->name, kobject_name(&dev->dev.kobj), error); |
5b2a0826 DT |
965 | |
966 | return error; | |
967 | } | |
968 | ||
15e184af DT |
969 | #ifdef CONFIG_COMPAT |
970 | ||
971 | static int input_bits_to_string(char *buf, int buf_size, | |
972 | unsigned long bits, bool skip_empty) | |
973 | { | |
974 | int len = 0; | |
975 | ||
976 | if (INPUT_COMPAT_TEST) { | |
977 | u32 dword = bits >> 32; | |
978 | if (dword || !skip_empty) | |
979 | len += snprintf(buf, buf_size, "%x ", dword); | |
980 | ||
981 | dword = bits & 0xffffffffUL; | |
982 | if (dword || !skip_empty || len) | |
983 | len += snprintf(buf + len, max(buf_size - len, 0), | |
984 | "%x", dword); | |
985 | } else { | |
986 | if (bits || !skip_empty) | |
987 | len += snprintf(buf, buf_size, "%lx", bits); | |
988 | } | |
989 | ||
990 | return len; | |
991 | } | |
992 | ||
993 | #else /* !CONFIG_COMPAT */ | |
994 | ||
995 | static int input_bits_to_string(char *buf, int buf_size, | |
996 | unsigned long bits, bool skip_empty) | |
997 | { | |
998 | return bits || !skip_empty ? | |
999 | snprintf(buf, buf_size, "%lx", bits) : 0; | |
1000 | } | |
1001 | ||
1002 | #endif | |
5b2a0826 | 1003 | |
f96b434d DT |
1004 | #ifdef CONFIG_PROC_FS |
1005 | ||
1006 | static struct proc_dir_entry *proc_bus_input_dir; | |
1007 | static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); | |
1008 | static int input_devices_state; | |
1009 | ||
1010 | static inline void input_wakeup_procfs_readers(void) | |
1011 | { | |
1012 | input_devices_state++; | |
1013 | wake_up(&input_devices_poll_wait); | |
1014 | } | |
1015 | ||
969b21cd | 1016 | static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait) |
f96b434d | 1017 | { |
f96b434d | 1018 | poll_wait(file, &input_devices_poll_wait, wait); |
fa886612 DT |
1019 | if (file->f_version != input_devices_state) { |
1020 | file->f_version = input_devices_state; | |
f96b434d | 1021 | return POLLIN | POLLRDNORM; |
fa886612 | 1022 | } |
1e0afb28 | 1023 | |
f96b434d DT |
1024 | return 0; |
1025 | } | |
1026 | ||
1572ca2a DT |
1027 | union input_seq_state { |
1028 | struct { | |
1029 | unsigned short pos; | |
1030 | bool mutex_acquired; | |
1031 | }; | |
1032 | void *p; | |
1033 | }; | |
1034 | ||
969b21cd DT |
1035 | static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) |
1036 | { | |
1572ca2a DT |
1037 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1038 | int error; | |
1039 | ||
1040 | /* We need to fit into seq->private pointer */ | |
1041 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
1042 | ||
1043 | error = mutex_lock_interruptible(&input_mutex); | |
1044 | if (error) { | |
1045 | state->mutex_acquired = false; | |
1046 | return ERR_PTR(error); | |
1047 | } | |
1048 | ||
1049 | state->mutex_acquired = true; | |
f96b434d | 1050 | |
ad5d972c | 1051 | return seq_list_start(&input_dev_list, *pos); |
969b21cd | 1052 | } |
051b2fea | 1053 | |
969b21cd DT |
1054 | static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1055 | { | |
ad5d972c | 1056 | return seq_list_next(v, &input_dev_list, pos); |
969b21cd | 1057 | } |
f96b434d | 1058 | |
1572ca2a | 1059 | static void input_seq_stop(struct seq_file *seq, void *v) |
969b21cd | 1060 | { |
1572ca2a DT |
1061 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1062 | ||
1063 | if (state->mutex_acquired) | |
1064 | mutex_unlock(&input_mutex); | |
969b21cd | 1065 | } |
f96b434d | 1066 | |
969b21cd DT |
1067 | static void input_seq_print_bitmap(struct seq_file *seq, const char *name, |
1068 | unsigned long *bitmap, int max) | |
1069 | { | |
1070 | int i; | |
15e184af DT |
1071 | bool skip_empty = true; |
1072 | char buf[18]; | |
f96b434d | 1073 | |
969b21cd | 1074 | seq_printf(seq, "B: %s=", name); |
15e184af DT |
1075 | |
1076 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
1077 | if (input_bits_to_string(buf, sizeof(buf), | |
1078 | bitmap[i], skip_empty)) { | |
1079 | skip_empty = false; | |
1080 | seq_printf(seq, "%s%s", buf, i > 0 ? " " : ""); | |
1081 | } | |
1082 | } | |
1083 | ||
1084 | /* | |
1085 | * If no output was produced print a single 0. | |
1086 | */ | |
1087 | if (skip_empty) | |
1088 | seq_puts(seq, "0"); | |
1089 | ||
969b21cd DT |
1090 | seq_putc(seq, '\n'); |
1091 | } | |
f96b434d | 1092 | |
969b21cd DT |
1093 | static int input_devices_seq_show(struct seq_file *seq, void *v) |
1094 | { | |
1095 | struct input_dev *dev = container_of(v, struct input_dev, node); | |
9657d75c | 1096 | const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
969b21cd DT |
1097 | struct input_handle *handle; |
1098 | ||
1099 | seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", | |
1100 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); | |
1101 | ||
1102 | seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); | |
1103 | seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : ""); | |
1104 | seq_printf(seq, "S: Sysfs=%s\n", path ? path : ""); | |
15e03ae8 | 1105 | seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : ""); |
969b21cd DT |
1106 | seq_printf(seq, "H: Handlers="); |
1107 | ||
1108 | list_for_each_entry(handle, &dev->h_list, d_node) | |
1109 | seq_printf(seq, "%s ", handle->name); | |
1110 | seq_putc(seq, '\n'); | |
1111 | ||
1112 | input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); | |
1113 | if (test_bit(EV_KEY, dev->evbit)) | |
1114 | input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); | |
1115 | if (test_bit(EV_REL, dev->evbit)) | |
1116 | input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); | |
1117 | if (test_bit(EV_ABS, dev->evbit)) | |
1118 | input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); | |
1119 | if (test_bit(EV_MSC, dev->evbit)) | |
1120 | input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); | |
1121 | if (test_bit(EV_LED, dev->evbit)) | |
1122 | input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); | |
1123 | if (test_bit(EV_SND, dev->evbit)) | |
1124 | input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); | |
1125 | if (test_bit(EV_FF, dev->evbit)) | |
1126 | input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); | |
1127 | if (test_bit(EV_SW, dev->evbit)) | |
1128 | input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); | |
1129 | ||
1130 | seq_putc(seq, '\n'); | |
1131 | ||
1132 | kfree(path); | |
1133 | return 0; | |
f96b434d DT |
1134 | } |
1135 | ||
cec69c37 | 1136 | static const struct seq_operations input_devices_seq_ops = { |
969b21cd DT |
1137 | .start = input_devices_seq_start, |
1138 | .next = input_devices_seq_next, | |
1572ca2a | 1139 | .stop = input_seq_stop, |
969b21cd DT |
1140 | .show = input_devices_seq_show, |
1141 | }; | |
1142 | ||
1143 | static int input_proc_devices_open(struct inode *inode, struct file *file) | |
f96b434d | 1144 | { |
969b21cd DT |
1145 | return seq_open(file, &input_devices_seq_ops); |
1146 | } | |
1147 | ||
2b8693c0 | 1148 | static const struct file_operations input_devices_fileops = { |
969b21cd DT |
1149 | .owner = THIS_MODULE, |
1150 | .open = input_proc_devices_open, | |
1151 | .poll = input_proc_devices_poll, | |
1152 | .read = seq_read, | |
1153 | .llseek = seq_lseek, | |
1154 | .release = seq_release, | |
1155 | }; | |
1156 | ||
1157 | static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) | |
1158 | { | |
1572ca2a DT |
1159 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1160 | int error; | |
1161 | ||
1162 | /* We need to fit into seq->private pointer */ | |
1163 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
1164 | ||
1165 | error = mutex_lock_interruptible(&input_mutex); | |
1166 | if (error) { | |
1167 | state->mutex_acquired = false; | |
1168 | return ERR_PTR(error); | |
1169 | } | |
1170 | ||
1171 | state->mutex_acquired = true; | |
1172 | state->pos = *pos; | |
8006479c | 1173 | |
ad5d972c | 1174 | return seq_list_start(&input_handler_list, *pos); |
969b21cd | 1175 | } |
f96b434d | 1176 | |
969b21cd DT |
1177 | static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1178 | { | |
1572ca2a | 1179 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
f96b434d | 1180 | |
1572ca2a DT |
1181 | state->pos = *pos + 1; |
1182 | return seq_list_next(v, &input_handler_list, pos); | |
969b21cd DT |
1183 | } |
1184 | ||
1185 | static int input_handlers_seq_show(struct seq_file *seq, void *v) | |
1186 | { | |
1187 | struct input_handler *handler = container_of(v, struct input_handler, node); | |
1572ca2a | 1188 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
969b21cd | 1189 | |
1572ca2a | 1190 | seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name); |
ef7995f4 DT |
1191 | if (handler->filter) |
1192 | seq_puts(seq, " (filter)"); | |
969b21cd DT |
1193 | if (handler->fops) |
1194 | seq_printf(seq, " Minor=%d", handler->minor); | |
1195 | seq_putc(seq, '\n'); | |
1196 | ||
1197 | return 0; | |
1198 | } | |
1572ca2a | 1199 | |
cec69c37 | 1200 | static const struct seq_operations input_handlers_seq_ops = { |
969b21cd DT |
1201 | .start = input_handlers_seq_start, |
1202 | .next = input_handlers_seq_next, | |
1572ca2a | 1203 | .stop = input_seq_stop, |
969b21cd DT |
1204 | .show = input_handlers_seq_show, |
1205 | }; | |
1206 | ||
1207 | static int input_proc_handlers_open(struct inode *inode, struct file *file) | |
1208 | { | |
1209 | return seq_open(file, &input_handlers_seq_ops); | |
1210 | } | |
1211 | ||
2b8693c0 | 1212 | static const struct file_operations input_handlers_fileops = { |
969b21cd DT |
1213 | .owner = THIS_MODULE, |
1214 | .open = input_proc_handlers_open, | |
1215 | .read = seq_read, | |
1216 | .llseek = seq_lseek, | |
1217 | .release = seq_release, | |
1218 | }; | |
f96b434d DT |
1219 | |
1220 | static int __init input_proc_init(void) | |
1221 | { | |
1222 | struct proc_dir_entry *entry; | |
1223 | ||
9c37066d | 1224 | proc_bus_input_dir = proc_mkdir("bus/input", NULL); |
f96b434d DT |
1225 | if (!proc_bus_input_dir) |
1226 | return -ENOMEM; | |
1227 | ||
c7705f34 DL |
1228 | entry = proc_create("devices", 0, proc_bus_input_dir, |
1229 | &input_devices_fileops); | |
f96b434d DT |
1230 | if (!entry) |
1231 | goto fail1; | |
1232 | ||
c7705f34 DL |
1233 | entry = proc_create("handlers", 0, proc_bus_input_dir, |
1234 | &input_handlers_fileops); | |
f96b434d DT |
1235 | if (!entry) |
1236 | goto fail2; | |
1237 | ||
f96b434d DT |
1238 | return 0; |
1239 | ||
1240 | fail2: remove_proc_entry("devices", proc_bus_input_dir); | |
9c37066d | 1241 | fail1: remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1242 | return -ENOMEM; |
1243 | } | |
1244 | ||
beffbdc2 | 1245 | static void input_proc_exit(void) |
f96b434d DT |
1246 | { |
1247 | remove_proc_entry("devices", proc_bus_input_dir); | |
1248 | remove_proc_entry("handlers", proc_bus_input_dir); | |
9c37066d | 1249 | remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1250 | } |
1251 | ||
1252 | #else /* !CONFIG_PROC_FS */ | |
1253 | static inline void input_wakeup_procfs_readers(void) { } | |
1254 | static inline int input_proc_init(void) { return 0; } | |
1255 | static inline void input_proc_exit(void) { } | |
1256 | #endif | |
1257 | ||
9657d75c DT |
1258 | #define INPUT_DEV_STRING_ATTR_SHOW(name) \ |
1259 | static ssize_t input_dev_show_##name(struct device *dev, \ | |
1260 | struct device_attribute *attr, \ | |
1261 | char *buf) \ | |
1262 | { \ | |
1263 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1264 | \ | |
1265 | return scnprintf(buf, PAGE_SIZE, "%s\n", \ | |
1266 | input_dev->name ? input_dev->name : ""); \ | |
1267 | } \ | |
1268 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL) | |
5c1e9a6a DT |
1269 | |
1270 | INPUT_DEV_STRING_ATTR_SHOW(name); | |
1271 | INPUT_DEV_STRING_ATTR_SHOW(phys); | |
1272 | INPUT_DEV_STRING_ATTR_SHOW(uniq); | |
1273 | ||
ac648a6a DT |
1274 | static int input_print_modalias_bits(char *buf, int size, |
1275 | char name, unsigned long *bm, | |
1276 | unsigned int min_bit, unsigned int max_bit) | |
1d8f430c | 1277 | { |
ac648a6a | 1278 | int len = 0, i; |
1d8f430c | 1279 | |
ac648a6a DT |
1280 | len += snprintf(buf, max(size, 0), "%c", name); |
1281 | for (i = min_bit; i < max_bit; i++) | |
7b19ada2 | 1282 | if (bm[BIT_WORD(i)] & BIT_MASK(i)) |
ac648a6a | 1283 | len += snprintf(buf + len, max(size - len, 0), "%X,", i); |
1d8f430c RR |
1284 | return len; |
1285 | } | |
1286 | ||
2db66876 DT |
1287 | static int input_print_modalias(char *buf, int size, struct input_dev *id, |
1288 | int add_cr) | |
1d8f430c | 1289 | { |
bd37e5a9 | 1290 | int len; |
1d8f430c | 1291 | |
ac648a6a DT |
1292 | len = snprintf(buf, max(size, 0), |
1293 | "input:b%04Xv%04Xp%04Xe%04X-", | |
1294 | id->id.bustype, id->id.vendor, | |
1295 | id->id.product, id->id.version); | |
1296 | ||
1297 | len += input_print_modalias_bits(buf + len, size - len, | |
1298 | 'e', id->evbit, 0, EV_MAX); | |
1299 | len += input_print_modalias_bits(buf + len, size - len, | |
1300 | 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); | |
1301 | len += input_print_modalias_bits(buf + len, size - len, | |
1302 | 'r', id->relbit, 0, REL_MAX); | |
1303 | len += input_print_modalias_bits(buf + len, size - len, | |
1304 | 'a', id->absbit, 0, ABS_MAX); | |
1305 | len += input_print_modalias_bits(buf + len, size - len, | |
1306 | 'm', id->mscbit, 0, MSC_MAX); | |
1307 | len += input_print_modalias_bits(buf + len, size - len, | |
1308 | 'l', id->ledbit, 0, LED_MAX); | |
1309 | len += input_print_modalias_bits(buf + len, size - len, | |
1310 | 's', id->sndbit, 0, SND_MAX); | |
1311 | len += input_print_modalias_bits(buf + len, size - len, | |
1312 | 'f', id->ffbit, 0, FF_MAX); | |
1313 | len += input_print_modalias_bits(buf + len, size - len, | |
1314 | 'w', id->swbit, 0, SW_MAX); | |
2db66876 DT |
1315 | |
1316 | if (add_cr) | |
ac648a6a | 1317 | len += snprintf(buf + len, max(size - len, 0), "\n"); |
2db66876 | 1318 | |
bd37e5a9 KS |
1319 | return len; |
1320 | } | |
1321 | ||
9657d75c DT |
1322 | static ssize_t input_dev_show_modalias(struct device *dev, |
1323 | struct device_attribute *attr, | |
1324 | char *buf) | |
bd37e5a9 KS |
1325 | { |
1326 | struct input_dev *id = to_input_dev(dev); | |
1327 | ssize_t len; | |
1328 | ||
2db66876 DT |
1329 | len = input_print_modalias(buf, PAGE_SIZE, id, 1); |
1330 | ||
8a3cf456 | 1331 | return min_t(int, len, PAGE_SIZE); |
1d8f430c | 1332 | } |
9657d75c | 1333 | static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); |
1d8f430c | 1334 | |
629b77a4 | 1335 | static struct attribute *input_dev_attrs[] = { |
9657d75c DT |
1336 | &dev_attr_name.attr, |
1337 | &dev_attr_phys.attr, | |
1338 | &dev_attr_uniq.attr, | |
1339 | &dev_attr_modalias.attr, | |
629b77a4 GKH |
1340 | NULL |
1341 | }; | |
1342 | ||
bd0ef235 | 1343 | static struct attribute_group input_dev_attr_group = { |
629b77a4 | 1344 | .attrs = input_dev_attrs, |
5c1e9a6a DT |
1345 | }; |
1346 | ||
9657d75c DT |
1347 | #define INPUT_DEV_ID_ATTR(name) \ |
1348 | static ssize_t input_dev_show_id_##name(struct device *dev, \ | |
1349 | struct device_attribute *attr, \ | |
1350 | char *buf) \ | |
1351 | { \ | |
1352 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1353 | return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \ | |
1354 | } \ | |
1355 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL) | |
5c1e9a6a DT |
1356 | |
1357 | INPUT_DEV_ID_ATTR(bustype); | |
1358 | INPUT_DEV_ID_ATTR(vendor); | |
1359 | INPUT_DEV_ID_ATTR(product); | |
1360 | INPUT_DEV_ID_ATTR(version); | |
1361 | ||
1362 | static struct attribute *input_dev_id_attrs[] = { | |
9657d75c DT |
1363 | &dev_attr_bustype.attr, |
1364 | &dev_attr_vendor.attr, | |
1365 | &dev_attr_product.attr, | |
1366 | &dev_attr_version.attr, | |
5c1e9a6a DT |
1367 | NULL |
1368 | }; | |
1369 | ||
1370 | static struct attribute_group input_dev_id_attr_group = { | |
1371 | .name = "id", | |
1372 | .attrs = input_dev_id_attrs, | |
1373 | }; | |
1374 | ||
969b21cd DT |
1375 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1376 | int max, int add_cr) | |
1377 | { | |
1378 | int i; | |
1379 | int len = 0; | |
15e184af DT |
1380 | bool skip_empty = true; |
1381 | ||
1382 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
1383 | len += input_bits_to_string(buf + len, max(buf_size - len, 0), | |
1384 | bitmap[i], skip_empty); | |
1385 | if (len) { | |
1386 | skip_empty = false; | |
1387 | if (i > 0) | |
1388 | len += snprintf(buf + len, max(buf_size - len, 0), " "); | |
1389 | } | |
1390 | } | |
969b21cd | 1391 | |
15e184af DT |
1392 | /* |
1393 | * If no output was produced print a single 0. | |
1394 | */ | |
1395 | if (len == 0) | |
1396 | len = snprintf(buf, buf_size, "%d", 0); | |
969b21cd DT |
1397 | |
1398 | if (add_cr) | |
1399 | len += snprintf(buf + len, max(buf_size - len, 0), "\n"); | |
1400 | ||
1401 | return len; | |
1402 | } | |
1403 | ||
9657d75c DT |
1404 | #define INPUT_DEV_CAP_ATTR(ev, bm) \ |
1405 | static ssize_t input_dev_show_cap_##bm(struct device *dev, \ | |
1406 | struct device_attribute *attr, \ | |
1407 | char *buf) \ | |
1408 | { \ | |
1409 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1410 | int len = input_print_bitmap(buf, PAGE_SIZE, \ | |
15e184af DT |
1411 | input_dev->bm##bit, ev##_MAX, \ |
1412 | true); \ | |
9657d75c DT |
1413 | return min_t(int, len, PAGE_SIZE); \ |
1414 | } \ | |
1415 | static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL) | |
5c1e9a6a DT |
1416 | |
1417 | INPUT_DEV_CAP_ATTR(EV, ev); | |
1418 | INPUT_DEV_CAP_ATTR(KEY, key); | |
1419 | INPUT_DEV_CAP_ATTR(REL, rel); | |
1420 | INPUT_DEV_CAP_ATTR(ABS, abs); | |
1421 | INPUT_DEV_CAP_ATTR(MSC, msc); | |
1422 | INPUT_DEV_CAP_ATTR(LED, led); | |
1423 | INPUT_DEV_CAP_ATTR(SND, snd); | |
1424 | INPUT_DEV_CAP_ATTR(FF, ff); | |
1425 | INPUT_DEV_CAP_ATTR(SW, sw); | |
1426 | ||
1427 | static struct attribute *input_dev_caps_attrs[] = { | |
9657d75c DT |
1428 | &dev_attr_ev.attr, |
1429 | &dev_attr_key.attr, | |
1430 | &dev_attr_rel.attr, | |
1431 | &dev_attr_abs.attr, | |
1432 | &dev_attr_msc.attr, | |
1433 | &dev_attr_led.attr, | |
1434 | &dev_attr_snd.attr, | |
1435 | &dev_attr_ff.attr, | |
1436 | &dev_attr_sw.attr, | |
5c1e9a6a DT |
1437 | NULL |
1438 | }; | |
1439 | ||
1440 | static struct attribute_group input_dev_caps_attr_group = { | |
1441 | .name = "capabilities", | |
1442 | .attrs = input_dev_caps_attrs, | |
1443 | }; | |
1444 | ||
a4dbd674 | 1445 | static const struct attribute_group *input_dev_attr_groups[] = { |
cb9def4d DT |
1446 | &input_dev_attr_group, |
1447 | &input_dev_id_attr_group, | |
1448 | &input_dev_caps_attr_group, | |
1449 | NULL | |
1450 | }; | |
1451 | ||
9657d75c | 1452 | static void input_dev_release(struct device *device) |
d19fbe8a | 1453 | { |
9657d75c | 1454 | struct input_dev *dev = to_input_dev(device); |
d19fbe8a | 1455 | |
509ca1a9 | 1456 | input_ff_destroy(dev); |
40d007e7 | 1457 | input_mt_destroy_slots(dev); |
d31b2865 | 1458 | kfree(dev->absinfo); |
d19fbe8a | 1459 | kfree(dev); |
509ca1a9 | 1460 | |
d19fbe8a DT |
1461 | module_put(THIS_MODULE); |
1462 | } | |
1463 | ||
a7fadbe1 | 1464 | /* |
312c004d | 1465 | * Input uevent interface - loading event handlers based on |
a7fadbe1 DT |
1466 | * device bitfields. |
1467 | */ | |
7eff2e7a | 1468 | static int input_add_uevent_bm_var(struct kobj_uevent_env *env, |
ac648a6a | 1469 | const char *name, unsigned long *bitmap, int max) |
a7fadbe1 | 1470 | { |
7eff2e7a | 1471 | int len; |
a7fadbe1 | 1472 | |
7eff2e7a | 1473 | if (add_uevent_var(env, "%s=", name)) |
a7fadbe1 DT |
1474 | return -ENOMEM; |
1475 | ||
7eff2e7a KS |
1476 | len = input_print_bitmap(&env->buf[env->buflen - 1], |
1477 | sizeof(env->buf) - env->buflen, | |
15e184af | 1478 | bitmap, max, false); |
7eff2e7a | 1479 | if (len >= (sizeof(env->buf) - env->buflen)) |
a7fadbe1 DT |
1480 | return -ENOMEM; |
1481 | ||
7eff2e7a | 1482 | env->buflen += len; |
a7fadbe1 DT |
1483 | return 0; |
1484 | } | |
1485 | ||
7eff2e7a | 1486 | static int input_add_uevent_modalias_var(struct kobj_uevent_env *env, |
ac648a6a DT |
1487 | struct input_dev *dev) |
1488 | { | |
7eff2e7a | 1489 | int len; |
ac648a6a | 1490 | |
7eff2e7a | 1491 | if (add_uevent_var(env, "MODALIAS=")) |
ac648a6a DT |
1492 | return -ENOMEM; |
1493 | ||
7eff2e7a KS |
1494 | len = input_print_modalias(&env->buf[env->buflen - 1], |
1495 | sizeof(env->buf) - env->buflen, | |
1496 | dev, 0); | |
1497 | if (len >= (sizeof(env->buf) - env->buflen)) | |
ac648a6a DT |
1498 | return -ENOMEM; |
1499 | ||
7eff2e7a | 1500 | env->buflen += len; |
ac648a6a DT |
1501 | return 0; |
1502 | } | |
1503 | ||
a7fadbe1 DT |
1504 | #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \ |
1505 | do { \ | |
7eff2e7a | 1506 | int err = add_uevent_var(env, fmt, val); \ |
a7fadbe1 DT |
1507 | if (err) \ |
1508 | return err; \ | |
1509 | } while (0) | |
1510 | ||
1511 | #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \ | |
1512 | do { \ | |
7eff2e7a | 1513 | int err = input_add_uevent_bm_var(env, name, bm, max); \ |
a7fadbe1 DT |
1514 | if (err) \ |
1515 | return err; \ | |
1516 | } while (0) | |
1517 | ||
ac648a6a DT |
1518 | #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \ |
1519 | do { \ | |
7eff2e7a | 1520 | int err = input_add_uevent_modalias_var(env, dev); \ |
ac648a6a DT |
1521 | if (err) \ |
1522 | return err; \ | |
1523 | } while (0) | |
1524 | ||
7eff2e7a | 1525 | static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env) |
a7fadbe1 | 1526 | { |
9657d75c | 1527 | struct input_dev *dev = to_input_dev(device); |
a7fadbe1 DT |
1528 | |
1529 | INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x", | |
1530 | dev->id.bustype, dev->id.vendor, | |
1531 | dev->id.product, dev->id.version); | |
1532 | if (dev->name) | |
1533 | INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); | |
1534 | if (dev->phys) | |
1535 | INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); | |
08de1f04 | 1536 | if (dev->uniq) |
a7fadbe1 DT |
1537 | INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); |
1538 | ||
1539 | INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX); | |
1540 | if (test_bit(EV_KEY, dev->evbit)) | |
1541 | INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX); | |
1542 | if (test_bit(EV_REL, dev->evbit)) | |
1543 | INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX); | |
1544 | if (test_bit(EV_ABS, dev->evbit)) | |
1545 | INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX); | |
1546 | if (test_bit(EV_MSC, dev->evbit)) | |
1547 | INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX); | |
1548 | if (test_bit(EV_LED, dev->evbit)) | |
1549 | INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX); | |
1550 | if (test_bit(EV_SND, dev->evbit)) | |
1551 | INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX); | |
1552 | if (test_bit(EV_FF, dev->evbit)) | |
1553 | INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX); | |
1554 | if (test_bit(EV_SW, dev->evbit)) | |
1555 | INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); | |
1556 | ||
ac648a6a | 1557 | INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); |
a7fadbe1 DT |
1558 | |
1559 | return 0; | |
1560 | } | |
1561 | ||
3cc96351 DT |
1562 | #define INPUT_DO_TOGGLE(dev, type, bits, on) \ |
1563 | do { \ | |
1564 | int i; \ | |
1565 | bool active; \ | |
1566 | \ | |
1567 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1568 | break; \ | |
1569 | \ | |
1570 | for (i = 0; i < type##_MAX; i++) { \ | |
1571 | if (!test_bit(i, dev->bits##bit)) \ | |
1572 | continue; \ | |
1573 | \ | |
1574 | active = test_bit(i, dev->bits); \ | |
1575 | if (!active && !on) \ | |
1576 | continue; \ | |
1577 | \ | |
1578 | dev->event(dev, EV_##type, i, on ? active : 0); \ | |
1579 | } \ | |
ffd0db97 DT |
1580 | } while (0) |
1581 | ||
b50b5216 | 1582 | static void input_dev_toggle(struct input_dev *dev, bool activate) |
ffd0db97 DT |
1583 | { |
1584 | if (!dev->event) | |
1585 | return; | |
1586 | ||
1587 | INPUT_DO_TOGGLE(dev, LED, led, activate); | |
1588 | INPUT_DO_TOGGLE(dev, SND, snd, activate); | |
1589 | ||
1590 | if (activate && test_bit(EV_REP, dev->evbit)) { | |
1591 | dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]); | |
1592 | dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]); | |
1593 | } | |
1594 | } | |
1595 | ||
b50b5216 DT |
1596 | /** |
1597 | * input_reset_device() - reset/restore the state of input device | |
1598 | * @dev: input device whose state needs to be reset | |
1599 | * | |
1600 | * This function tries to reset the state of an opened input device and | |
1601 | * bring internal state and state if the hardware in sync with each other. | |
1602 | * We mark all keys as released, restore LED state, repeat rate, etc. | |
1603 | */ | |
1604 | void input_reset_device(struct input_dev *dev) | |
1605 | { | |
1606 | mutex_lock(&dev->mutex); | |
1607 | ||
1608 | if (dev->users) { | |
1609 | input_dev_toggle(dev, true); | |
1610 | ||
1611 | /* | |
1612 | * Keys that have been pressed at suspend time are unlikely | |
1613 | * to be still pressed when we resume. | |
1614 | */ | |
1615 | spin_lock_irq(&dev->event_lock); | |
1616 | input_dev_release_keys(dev); | |
1617 | spin_unlock_irq(&dev->event_lock); | |
1618 | } | |
1619 | ||
1620 | mutex_unlock(&dev->mutex); | |
1621 | } | |
1622 | EXPORT_SYMBOL(input_reset_device); | |
1623 | ||
1624 | #ifdef CONFIG_PM | |
ffd0db97 DT |
1625 | static int input_dev_suspend(struct device *dev) |
1626 | { | |
1627 | struct input_dev *input_dev = to_input_dev(dev); | |
1628 | ||
1629 | mutex_lock(&input_dev->mutex); | |
b50b5216 DT |
1630 | |
1631 | if (input_dev->users) | |
1632 | input_dev_toggle(input_dev, false); | |
1633 | ||
ffd0db97 DT |
1634 | mutex_unlock(&input_dev->mutex); |
1635 | ||
1636 | return 0; | |
1637 | } | |
1638 | ||
1639 | static int input_dev_resume(struct device *dev) | |
1640 | { | |
1641 | struct input_dev *input_dev = to_input_dev(dev); | |
1642 | ||
b50b5216 | 1643 | input_reset_device(input_dev); |
ffd0db97 DT |
1644 | |
1645 | return 0; | |
1646 | } | |
1647 | ||
1648 | static const struct dev_pm_ops input_dev_pm_ops = { | |
1649 | .suspend = input_dev_suspend, | |
1650 | .resume = input_dev_resume, | |
1651 | .poweroff = input_dev_suspend, | |
1652 | .restore = input_dev_resume, | |
1653 | }; | |
1654 | #endif /* CONFIG_PM */ | |
1655 | ||
9657d75c DT |
1656 | static struct device_type input_dev_type = { |
1657 | .groups = input_dev_attr_groups, | |
1658 | .release = input_dev_release, | |
1659 | .uevent = input_dev_uevent, | |
ffd0db97 DT |
1660 | #ifdef CONFIG_PM |
1661 | .pm = &input_dev_pm_ops, | |
1662 | #endif | |
9657d75c DT |
1663 | }; |
1664 | ||
e454cea2 | 1665 | static char *input_devnode(struct device *dev, mode_t *mode) |
aa5ed63e KS |
1666 | { |
1667 | return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev)); | |
1668 | } | |
1669 | ||
ea9f240b | 1670 | struct class input_class = { |
9657d75c | 1671 | .name = "input", |
e454cea2 | 1672 | .devnode = input_devnode, |
d19fbe8a | 1673 | }; |
ca56fe07 | 1674 | EXPORT_SYMBOL_GPL(input_class); |
d19fbe8a | 1675 | |
1447190e DT |
1676 | /** |
1677 | * input_allocate_device - allocate memory for new input device | |
1678 | * | |
1679 | * Returns prepared struct input_dev or NULL. | |
1680 | * | |
1681 | * NOTE: Use input_free_device() to free devices that have not been | |
1682 | * registered; input_unregister_device() should be used for already | |
1683 | * registered devices. | |
1684 | */ | |
d19fbe8a DT |
1685 | struct input_dev *input_allocate_device(void) |
1686 | { | |
1687 | struct input_dev *dev; | |
1688 | ||
1689 | dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); | |
1690 | if (dev) { | |
9657d75c DT |
1691 | dev->dev.type = &input_dev_type; |
1692 | dev->dev.class = &input_class; | |
1693 | device_initialize(&dev->dev); | |
f60d2b11 | 1694 | mutex_init(&dev->mutex); |
8006479c | 1695 | spin_lock_init(&dev->event_lock); |
d19fbe8a DT |
1696 | INIT_LIST_HEAD(&dev->h_list); |
1697 | INIT_LIST_HEAD(&dev->node); | |
655816e4 DT |
1698 | |
1699 | __module_get(THIS_MODULE); | |
d19fbe8a DT |
1700 | } |
1701 | ||
1702 | return dev; | |
1703 | } | |
ca56fe07 | 1704 | EXPORT_SYMBOL(input_allocate_device); |
d19fbe8a | 1705 | |
1447190e DT |
1706 | /** |
1707 | * input_free_device - free memory occupied by input_dev structure | |
1708 | * @dev: input device to free | |
1709 | * | |
1710 | * This function should only be used if input_register_device() | |
1711 | * was not called yet or if it failed. Once device was registered | |
1712 | * use input_unregister_device() and memory will be freed once last | |
8006479c | 1713 | * reference to the device is dropped. |
1447190e DT |
1714 | * |
1715 | * Device should be allocated by input_allocate_device(). | |
1716 | * | |
1717 | * NOTE: If there are references to the input device then memory | |
1718 | * will not be freed until last reference is dropped. | |
1719 | */ | |
f60d2b11 DT |
1720 | void input_free_device(struct input_dev *dev) |
1721 | { | |
54f9e36c | 1722 | if (dev) |
f60d2b11 | 1723 | input_put_device(dev); |
f60d2b11 | 1724 | } |
ca56fe07 | 1725 | EXPORT_SYMBOL(input_free_device); |
f60d2b11 | 1726 | |
40d007e7 HR |
1727 | /** |
1728 | * input_mt_create_slots() - create MT input slots | |
1729 | * @dev: input device supporting MT events and finger tracking | |
1730 | * @num_slots: number of slots used by the device | |
1731 | * | |
ba4d695a HR |
1732 | * This function allocates all necessary memory for MT slot handling in the |
1733 | * input device, and adds ABS_MT_SLOT to the device capabilities. All slots | |
144c0f88 | 1734 | * are initially marked as unused by setting ABS_MT_TRACKING_ID to -1. |
40d007e7 HR |
1735 | */ |
1736 | int input_mt_create_slots(struct input_dev *dev, unsigned int num_slots) | |
1737 | { | |
ba4d695a HR |
1738 | int i; |
1739 | ||
40d007e7 HR |
1740 | if (!num_slots) |
1741 | return 0; | |
1742 | ||
1743 | dev->mt = kcalloc(num_slots, sizeof(struct input_mt_slot), GFP_KERNEL); | |
1744 | if (!dev->mt) | |
1745 | return -ENOMEM; | |
1746 | ||
1747 | dev->mtsize = num_slots; | |
1748 | input_set_abs_params(dev, ABS_MT_SLOT, 0, num_slots - 1, 0, 0); | |
1749 | ||
ba4d695a HR |
1750 | /* Mark slots as 'unused' */ |
1751 | for (i = 0; i < num_slots; i++) | |
1752 | dev->mt[i].abs[ABS_MT_TRACKING_ID - ABS_MT_FIRST] = -1; | |
1753 | ||
40d007e7 HR |
1754 | return 0; |
1755 | } | |
1756 | EXPORT_SYMBOL(input_mt_create_slots); | |
1757 | ||
1758 | /** | |
1759 | * input_mt_destroy_slots() - frees the MT slots of the input device | |
1760 | * @dev: input device with allocated MT slots | |
1761 | * | |
1762 | * This function is only needed in error path as the input core will | |
1763 | * automatically free the MT slots when the device is destroyed. | |
1764 | */ | |
1765 | void input_mt_destroy_slots(struct input_dev *dev) | |
1766 | { | |
1767 | kfree(dev->mt); | |
1768 | dev->mt = NULL; | |
1769 | dev->mtsize = 0; | |
1770 | } | |
1771 | EXPORT_SYMBOL(input_mt_destroy_slots); | |
1772 | ||
534565f2 DT |
1773 | /** |
1774 | * input_set_capability - mark device as capable of a certain event | |
1775 | * @dev: device that is capable of emitting or accepting event | |
1776 | * @type: type of the event (EV_KEY, EV_REL, etc...) | |
1777 | * @code: event code | |
1778 | * | |
1779 | * In addition to setting up corresponding bit in appropriate capability | |
1780 | * bitmap the function also adjusts dev->evbit. | |
1781 | */ | |
1782 | void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code) | |
1783 | { | |
1784 | switch (type) { | |
1785 | case EV_KEY: | |
1786 | __set_bit(code, dev->keybit); | |
1787 | break; | |
1788 | ||
1789 | case EV_REL: | |
1790 | __set_bit(code, dev->relbit); | |
1791 | break; | |
1792 | ||
1793 | case EV_ABS: | |
1794 | __set_bit(code, dev->absbit); | |
1795 | break; | |
1796 | ||
1797 | case EV_MSC: | |
1798 | __set_bit(code, dev->mscbit); | |
1799 | break; | |
1800 | ||
1801 | case EV_SW: | |
1802 | __set_bit(code, dev->swbit); | |
1803 | break; | |
1804 | ||
1805 | case EV_LED: | |
1806 | __set_bit(code, dev->ledbit); | |
1807 | break; | |
1808 | ||
1809 | case EV_SND: | |
1810 | __set_bit(code, dev->sndbit); | |
1811 | break; | |
1812 | ||
1813 | case EV_FF: | |
1814 | __set_bit(code, dev->ffbit); | |
1815 | break; | |
1816 | ||
22d1c398 DB |
1817 | case EV_PWR: |
1818 | /* do nothing */ | |
1819 | break; | |
1820 | ||
534565f2 DT |
1821 | default: |
1822 | printk(KERN_ERR | |
1823 | "input_set_capability: unknown type %u (code %u)\n", | |
1824 | type, code); | |
1825 | dump_stack(); | |
1826 | return; | |
1827 | } | |
1828 | ||
1829 | __set_bit(type, dev->evbit); | |
1830 | } | |
1831 | EXPORT_SYMBOL(input_set_capability); | |
1832 | ||
92a3a587 DT |
1833 | #define INPUT_CLEANSE_BITMASK(dev, type, bits) \ |
1834 | do { \ | |
1835 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1836 | memset(dev->bits##bit, 0, \ | |
1837 | sizeof(dev->bits##bit)); \ | |
1838 | } while (0) | |
1839 | ||
1840 | static void input_cleanse_bitmasks(struct input_dev *dev) | |
1841 | { | |
1842 | INPUT_CLEANSE_BITMASK(dev, KEY, key); | |
1843 | INPUT_CLEANSE_BITMASK(dev, REL, rel); | |
1844 | INPUT_CLEANSE_BITMASK(dev, ABS, abs); | |
1845 | INPUT_CLEANSE_BITMASK(dev, MSC, msc); | |
1846 | INPUT_CLEANSE_BITMASK(dev, LED, led); | |
1847 | INPUT_CLEANSE_BITMASK(dev, SND, snd); | |
1848 | INPUT_CLEANSE_BITMASK(dev, FF, ff); | |
1849 | INPUT_CLEANSE_BITMASK(dev, SW, sw); | |
1850 | } | |
1851 | ||
8006479c DT |
1852 | /** |
1853 | * input_register_device - register device with input core | |
1854 | * @dev: device to be registered | |
1855 | * | |
1856 | * This function registers device with input core. The device must be | |
1857 | * allocated with input_allocate_device() and all it's capabilities | |
1858 | * set up before registering. | |
1859 | * If function fails the device must be freed with input_free_device(). | |
1860 | * Once device has been successfully registered it can be unregistered | |
1861 | * with input_unregister_device(); input_free_device() should not be | |
1862 | * called in this case. | |
1863 | */ | |
5f945489 | 1864 | int input_register_device(struct input_dev *dev) |
1da177e4 | 1865 | { |
bd0ef235 | 1866 | static atomic_t input_no = ATOMIC_INIT(0); |
1da177e4 | 1867 | struct input_handler *handler; |
bd0ef235 DT |
1868 | const char *path; |
1869 | int error; | |
1da177e4 | 1870 | |
4f93df40 | 1871 | /* Every input device generates EV_SYN/SYN_REPORT events. */ |
8006479c | 1872 | __set_bit(EV_SYN, dev->evbit); |
0fbf87ca | 1873 | |
4f93df40 DT |
1874 | /* KEY_RESERVED is not supposed to be transmitted to userspace. */ |
1875 | __clear_bit(KEY_RESERVED, dev->keybit); | |
1876 | ||
92a3a587 DT |
1877 | /* Make sure that bitmasks not mentioned in dev->evbit are clean. */ |
1878 | input_cleanse_bitmasks(dev); | |
1879 | ||
1da177e4 LT |
1880 | /* |
1881 | * If delay and period are pre-set by the driver, then autorepeating | |
1882 | * is handled by the driver itself and we don't do it in input.c. | |
1883 | */ | |
1da177e4 LT |
1884 | init_timer(&dev->timer); |
1885 | if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { | |
1886 | dev->timer.data = (long) dev; | |
1887 | dev->timer.function = input_repeat_key; | |
1888 | dev->rep[REP_DELAY] = 250; | |
1889 | dev->rep[REP_PERIOD] = 33; | |
1890 | } | |
1891 | ||
8613e4c2 MCC |
1892 | if (!dev->getkeycode && !dev->getkeycode_new) |
1893 | dev->getkeycode_new = input_default_getkeycode; | |
c8e4c772 | 1894 | |
8613e4c2 MCC |
1895 | if (!dev->setkeycode && !dev->setkeycode_new) |
1896 | dev->setkeycode_new = input_default_setkeycode; | |
c8e4c772 | 1897 | |
a6c2490f KS |
1898 | dev_set_name(&dev->dev, "input%ld", |
1899 | (unsigned long) atomic_inc_return(&input_no) - 1); | |
bd0ef235 | 1900 | |
9657d75c | 1901 | error = device_add(&dev->dev); |
bd0ef235 DT |
1902 | if (error) |
1903 | return error; | |
1904 | ||
9657d75c | 1905 | path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
bd0ef235 DT |
1906 | printk(KERN_INFO "input: %s as %s\n", |
1907 | dev->name ? dev->name : "Unspecified device", path ? path : "N/A"); | |
1908 | kfree(path); | |
10204020 | 1909 | |
8006479c DT |
1910 | error = mutex_lock_interruptible(&input_mutex); |
1911 | if (error) { | |
1912 | device_del(&dev->dev); | |
1913 | return error; | |
1914 | } | |
1915 | ||
1916 | list_add_tail(&dev->node, &input_dev_list); | |
1917 | ||
1da177e4 | 1918 | list_for_each_entry(handler, &input_handler_list, node) |
5b2a0826 | 1919 | input_attach_handler(dev, handler); |
1da177e4 | 1920 | |
f96b434d | 1921 | input_wakeup_procfs_readers(); |
5f945489 | 1922 | |
8006479c DT |
1923 | mutex_unlock(&input_mutex); |
1924 | ||
5f945489 | 1925 | return 0; |
1da177e4 | 1926 | } |
ca56fe07 | 1927 | EXPORT_SYMBOL(input_register_device); |
1da177e4 | 1928 | |
8006479c DT |
1929 | /** |
1930 | * input_unregister_device - unregister previously registered device | |
1931 | * @dev: device to be unregistered | |
1932 | * | |
1933 | * This function unregisters an input device. Once device is unregistered | |
1934 | * the caller should not try to access it as it may get freed at any moment. | |
1935 | */ | |
1da177e4 LT |
1936 | void input_unregister_device(struct input_dev *dev) |
1937 | { | |
5b2a0826 | 1938 | struct input_handle *handle, *next; |
1da177e4 | 1939 | |
8006479c | 1940 | input_disconnect_device(dev); |
1da177e4 | 1941 | |
8006479c | 1942 | mutex_lock(&input_mutex); |
1da177e4 | 1943 | |
5b2a0826 | 1944 | list_for_each_entry_safe(handle, next, &dev->h_list, d_node) |
1da177e4 | 1945 | handle->handler->disconnect(handle); |
5b2a0826 | 1946 | WARN_ON(!list_empty(&dev->h_list)); |
1da177e4 | 1947 | |
8006479c | 1948 | del_timer_sync(&dev->timer); |
1da177e4 LT |
1949 | list_del_init(&dev->node); |
1950 | ||
f96b434d | 1951 | input_wakeup_procfs_readers(); |
8006479c DT |
1952 | |
1953 | mutex_unlock(&input_mutex); | |
1954 | ||
1955 | device_unregister(&dev->dev); | |
1da177e4 | 1956 | } |
ca56fe07 | 1957 | EXPORT_SYMBOL(input_unregister_device); |
1da177e4 | 1958 | |
8006479c DT |
1959 | /** |
1960 | * input_register_handler - register a new input handler | |
1961 | * @handler: handler to be registered | |
1962 | * | |
1963 | * This function registers a new input handler (interface) for input | |
1964 | * devices in the system and attaches it to all input devices that | |
1965 | * are compatible with the handler. | |
1966 | */ | |
4263cf0f | 1967 | int input_register_handler(struct input_handler *handler) |
1da177e4 LT |
1968 | { |
1969 | struct input_dev *dev; | |
8006479c DT |
1970 | int retval; |
1971 | ||
1972 | retval = mutex_lock_interruptible(&input_mutex); | |
1973 | if (retval) | |
1974 | return retval; | |
1da177e4 | 1975 | |
1da177e4 LT |
1976 | INIT_LIST_HEAD(&handler->h_list); |
1977 | ||
4263cf0f | 1978 | if (handler->fops != NULL) { |
8006479c DT |
1979 | if (input_table[handler->minor >> 5]) { |
1980 | retval = -EBUSY; | |
1981 | goto out; | |
1982 | } | |
1da177e4 | 1983 | input_table[handler->minor >> 5] = handler; |
4263cf0f | 1984 | } |
1da177e4 LT |
1985 | |
1986 | list_add_tail(&handler->node, &input_handler_list); | |
1987 | ||
1988 | list_for_each_entry(dev, &input_dev_list, node) | |
5b2a0826 | 1989 | input_attach_handler(dev, handler); |
1da177e4 | 1990 | |
f96b434d | 1991 | input_wakeup_procfs_readers(); |
8006479c DT |
1992 | |
1993 | out: | |
1994 | mutex_unlock(&input_mutex); | |
1995 | return retval; | |
1da177e4 | 1996 | } |
ca56fe07 | 1997 | EXPORT_SYMBOL(input_register_handler); |
1da177e4 | 1998 | |
8006479c DT |
1999 | /** |
2000 | * input_unregister_handler - unregisters an input handler | |
2001 | * @handler: handler to be unregistered | |
2002 | * | |
2003 | * This function disconnects a handler from its input devices and | |
2004 | * removes it from lists of known handlers. | |
2005 | */ | |
1da177e4 LT |
2006 | void input_unregister_handler(struct input_handler *handler) |
2007 | { | |
5b2a0826 | 2008 | struct input_handle *handle, *next; |
1da177e4 | 2009 | |
8006479c DT |
2010 | mutex_lock(&input_mutex); |
2011 | ||
5b2a0826 | 2012 | list_for_each_entry_safe(handle, next, &handler->h_list, h_node) |
1da177e4 | 2013 | handler->disconnect(handle); |
5b2a0826 | 2014 | WARN_ON(!list_empty(&handler->h_list)); |
1da177e4 LT |
2015 | |
2016 | list_del_init(&handler->node); | |
2017 | ||
2018 | if (handler->fops != NULL) | |
2019 | input_table[handler->minor >> 5] = NULL; | |
2020 | ||
f96b434d | 2021 | input_wakeup_procfs_readers(); |
8006479c DT |
2022 | |
2023 | mutex_unlock(&input_mutex); | |
1da177e4 | 2024 | } |
ca56fe07 | 2025 | EXPORT_SYMBOL(input_unregister_handler); |
1da177e4 | 2026 | |
66d2a595 DT |
2027 | /** |
2028 | * input_handler_for_each_handle - handle iterator | |
2029 | * @handler: input handler to iterate | |
2030 | * @data: data for the callback | |
2031 | * @fn: function to be called for each handle | |
2032 | * | |
2033 | * Iterate over @bus's list of devices, and call @fn for each, passing | |
2034 | * it @data and stop when @fn returns a non-zero value. The function is | |
2035 | * using RCU to traverse the list and therefore may be usind in atonic | |
2036 | * contexts. The @fn callback is invoked from RCU critical section and | |
2037 | * thus must not sleep. | |
2038 | */ | |
2039 | int input_handler_for_each_handle(struct input_handler *handler, void *data, | |
2040 | int (*fn)(struct input_handle *, void *)) | |
2041 | { | |
2042 | struct input_handle *handle; | |
2043 | int retval = 0; | |
2044 | ||
2045 | rcu_read_lock(); | |
2046 | ||
2047 | list_for_each_entry_rcu(handle, &handler->h_list, h_node) { | |
2048 | retval = fn(handle, data); | |
2049 | if (retval) | |
2050 | break; | |
2051 | } | |
2052 | ||
2053 | rcu_read_unlock(); | |
2054 | ||
2055 | return retval; | |
2056 | } | |
2057 | EXPORT_SYMBOL(input_handler_for_each_handle); | |
2058 | ||
8006479c DT |
2059 | /** |
2060 | * input_register_handle - register a new input handle | |
2061 | * @handle: handle to register | |
2062 | * | |
2063 | * This function puts a new input handle onto device's | |
2064 | * and handler's lists so that events can flow through | |
2065 | * it once it is opened using input_open_device(). | |
2066 | * | |
2067 | * This function is supposed to be called from handler's | |
2068 | * connect() method. | |
2069 | */ | |
5b2a0826 DT |
2070 | int input_register_handle(struct input_handle *handle) |
2071 | { | |
2072 | struct input_handler *handler = handle->handler; | |
8006479c DT |
2073 | struct input_dev *dev = handle->dev; |
2074 | int error; | |
2075 | ||
2076 | /* | |
2077 | * We take dev->mutex here to prevent race with | |
2078 | * input_release_device(). | |
2079 | */ | |
2080 | error = mutex_lock_interruptible(&dev->mutex); | |
2081 | if (error) | |
2082 | return error; | |
ef7995f4 DT |
2083 | |
2084 | /* | |
2085 | * Filters go to the head of the list, normal handlers | |
2086 | * to the tail. | |
2087 | */ | |
2088 | if (handler->filter) | |
2089 | list_add_rcu(&handle->d_node, &dev->h_list); | |
2090 | else | |
2091 | list_add_tail_rcu(&handle->d_node, &dev->h_list); | |
2092 | ||
8006479c | 2093 | mutex_unlock(&dev->mutex); |
5b2a0826 | 2094 | |
8006479c DT |
2095 | /* |
2096 | * Since we are supposed to be called from ->connect() | |
2097 | * which is mutually exclusive with ->disconnect() | |
2098 | * we can't be racing with input_unregister_handle() | |
2099 | * and so separate lock is not needed here. | |
2100 | */ | |
66d2a595 | 2101 | list_add_tail_rcu(&handle->h_node, &handler->h_list); |
5b2a0826 DT |
2102 | |
2103 | if (handler->start) | |
2104 | handler->start(handle); | |
2105 | ||
2106 | return 0; | |
2107 | } | |
2108 | EXPORT_SYMBOL(input_register_handle); | |
2109 | ||
8006479c DT |
2110 | /** |
2111 | * input_unregister_handle - unregister an input handle | |
2112 | * @handle: handle to unregister | |
2113 | * | |
2114 | * This function removes input handle from device's | |
2115 | * and handler's lists. | |
2116 | * | |
2117 | * This function is supposed to be called from handler's | |
2118 | * disconnect() method. | |
2119 | */ | |
5b2a0826 DT |
2120 | void input_unregister_handle(struct input_handle *handle) |
2121 | { | |
8006479c DT |
2122 | struct input_dev *dev = handle->dev; |
2123 | ||
66d2a595 | 2124 | list_del_rcu(&handle->h_node); |
8006479c DT |
2125 | |
2126 | /* | |
2127 | * Take dev->mutex to prevent race with input_release_device(). | |
2128 | */ | |
2129 | mutex_lock(&dev->mutex); | |
2130 | list_del_rcu(&handle->d_node); | |
2131 | mutex_unlock(&dev->mutex); | |
66d2a595 | 2132 | |
82ba56c2 | 2133 | synchronize_rcu(); |
5b2a0826 DT |
2134 | } |
2135 | EXPORT_SYMBOL(input_unregister_handle); | |
2136 | ||
1da177e4 LT |
2137 | static int input_open_file(struct inode *inode, struct file *file) |
2138 | { | |
2edbf853 | 2139 | struct input_handler *handler; |
99ac48f5 | 2140 | const struct file_operations *old_fops, *new_fops = NULL; |
1da177e4 LT |
2141 | int err; |
2142 | ||
2f2177c8 AB |
2143 | err = mutex_lock_interruptible(&input_mutex); |
2144 | if (err) | |
2145 | return err; | |
2146 | ||
1da177e4 | 2147 | /* No load-on-demand here? */ |
2edbf853 | 2148 | handler = input_table[iminor(inode) >> 5]; |
2f2177c8 AB |
2149 | if (handler) |
2150 | new_fops = fops_get(handler->fops); | |
2151 | ||
2152 | mutex_unlock(&input_mutex); | |
1da177e4 LT |
2153 | |
2154 | /* | |
2155 | * That's _really_ odd. Usually NULL ->open means "nothing special", | |
2156 | * not "no device". Oh, well... | |
2157 | */ | |
2f2177c8 | 2158 | if (!new_fops || !new_fops->open) { |
1da177e4 | 2159 | fops_put(new_fops); |
2edbf853 JC |
2160 | err = -ENODEV; |
2161 | goto out; | |
1da177e4 | 2162 | } |
2f2177c8 | 2163 | |
1da177e4 LT |
2164 | old_fops = file->f_op; |
2165 | file->f_op = new_fops; | |
2166 | ||
2167 | err = new_fops->open(inode, file); | |
1da177e4 LT |
2168 | if (err) { |
2169 | fops_put(file->f_op); | |
2170 | file->f_op = fops_get(old_fops); | |
2171 | } | |
2172 | fops_put(old_fops); | |
2edbf853 | 2173 | out: |
1da177e4 LT |
2174 | return err; |
2175 | } | |
2176 | ||
2b8693c0 | 2177 | static const struct file_operations input_fops = { |
1da177e4 LT |
2178 | .owner = THIS_MODULE, |
2179 | .open = input_open_file, | |
6038f373 | 2180 | .llseek = noop_llseek, |
1da177e4 LT |
2181 | }; |
2182 | ||
f96b434d | 2183 | static int __init input_init(void) |
1da177e4 | 2184 | { |
f96b434d | 2185 | int err; |
1da177e4 | 2186 | |
ea9f240b | 2187 | err = class_register(&input_class); |
d19fbe8a DT |
2188 | if (err) { |
2189 | printk(KERN_ERR "input: unable to register input_dev class\n"); | |
2190 | return err; | |
2191 | } | |
2192 | ||
f96b434d DT |
2193 | err = input_proc_init(); |
2194 | if (err) | |
b0fdfebb | 2195 | goto fail1; |
1da177e4 | 2196 | |
f96b434d DT |
2197 | err = register_chrdev(INPUT_MAJOR, "input", &input_fops); |
2198 | if (err) { | |
2199 | printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR); | |
b0fdfebb | 2200 | goto fail2; |
1da177e4 | 2201 | } |
e334016f | 2202 | |
1da177e4 | 2203 | return 0; |
1da177e4 | 2204 | |
b0fdfebb | 2205 | fail2: input_proc_exit(); |
ea9f240b | 2206 | fail1: class_unregister(&input_class); |
f96b434d | 2207 | return err; |
1da177e4 LT |
2208 | } |
2209 | ||
2210 | static void __exit input_exit(void) | |
2211 | { | |
f96b434d | 2212 | input_proc_exit(); |
1da177e4 | 2213 | unregister_chrdev(INPUT_MAJOR, "input"); |
ea9f240b | 2214 | class_unregister(&input_class); |
1da177e4 LT |
2215 | } |
2216 | ||
2217 | subsys_initcall(input_init); | |
2218 | module_exit(input_exit); |