Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * The input core | |
3 | * | |
4 | * Copyright (c) 1999-2002 Vojtech Pavlik | |
5 | */ | |
6 | ||
7 | /* | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License version 2 as published by | |
10 | * the Free Software Foundation. | |
11 | */ | |
12 | ||
da0c4901 JP |
13 | #define pr_fmt(fmt) KBUILD_BASENAME ": " fmt |
14 | ||
1da177e4 | 15 | #include <linux/init.h> |
ffd0db97 | 16 | #include <linux/types.h> |
47c78e89 | 17 | #include <linux/input/mt.h> |
1da177e4 | 18 | #include <linux/module.h> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
1da177e4 LT |
20 | #include <linux/random.h> |
21 | #include <linux/major.h> | |
22 | #include <linux/proc_fs.h> | |
a99bbaf5 | 23 | #include <linux/sched.h> |
969b21cd | 24 | #include <linux/seq_file.h> |
1da177e4 LT |
25 | #include <linux/poll.h> |
26 | #include <linux/device.h> | |
e676c232 | 27 | #include <linux/mutex.h> |
8006479c | 28 | #include <linux/rcupdate.h> |
15e184af | 29 | #include "input-compat.h" |
1da177e4 LT |
30 | |
31 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>"); | |
32 | MODULE_DESCRIPTION("Input core"); | |
33 | MODULE_LICENSE("GPL"); | |
34 | ||
1da177e4 LT |
35 | #define INPUT_DEVICES 256 |
36 | ||
37 | static LIST_HEAD(input_dev_list); | |
38 | static LIST_HEAD(input_handler_list); | |
39 | ||
8006479c DT |
40 | /* |
41 | * input_mutex protects access to both input_dev_list and input_handler_list. | |
42 | * This also causes input_[un]register_device and input_[un]register_handler | |
43 | * be mutually exclusive which simplifies locking in drivers implementing | |
44 | * input handlers. | |
45 | */ | |
46 | static DEFINE_MUTEX(input_mutex); | |
47 | ||
1da177e4 LT |
48 | static struct input_handler *input_table[8]; |
49 | ||
4369c64c HR |
50 | static const struct input_value input_value_sync = { EV_SYN, SYN_REPORT, 1 }; |
51 | ||
8006479c DT |
52 | static inline int is_event_supported(unsigned int code, |
53 | unsigned long *bm, unsigned int max) | |
1da177e4 | 54 | { |
8006479c DT |
55 | return code <= max && test_bit(code, bm); |
56 | } | |
1da177e4 | 57 | |
8006479c DT |
58 | static int input_defuzz_abs_event(int value, int old_val, int fuzz) |
59 | { | |
60 | if (fuzz) { | |
61 | if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2) | |
62 | return old_val; | |
1da177e4 | 63 | |
8006479c DT |
64 | if (value > old_val - fuzz && value < old_val + fuzz) |
65 | return (old_val * 3 + value) / 4; | |
1da177e4 | 66 | |
8006479c DT |
67 | if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2) |
68 | return (old_val + value) / 2; | |
69 | } | |
1da177e4 | 70 | |
8006479c DT |
71 | return value; |
72 | } | |
1da177e4 | 73 | |
352ac4bd HR |
74 | static void input_start_autorepeat(struct input_dev *dev, int code) |
75 | { | |
76 | if (test_bit(EV_REP, dev->evbit) && | |
77 | dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && | |
78 | dev->timer.data) { | |
79 | dev->repeat_key = code; | |
80 | mod_timer(&dev->timer, | |
81 | jiffies + msecs_to_jiffies(dev->rep[REP_DELAY])); | |
82 | } | |
83 | } | |
84 | ||
85 | static void input_stop_autorepeat(struct input_dev *dev) | |
86 | { | |
87 | del_timer(&dev->timer); | |
88 | } | |
89 | ||
8006479c | 90 | /* |
ef7995f4 DT |
91 | * Pass event first through all filters and then, if event has not been |
92 | * filtered out, through all open handles. This function is called with | |
82ba56c2 | 93 | * dev->event_lock held and interrupts disabled. |
8006479c | 94 | */ |
4369c64c HR |
95 | static unsigned int input_to_handler(struct input_handle *handle, |
96 | struct input_value *vals, unsigned int count) | |
8006479c | 97 | { |
4369c64c HR |
98 | struct input_handler *handler = handle->handler; |
99 | struct input_value *end = vals; | |
100 | struct input_value *v; | |
82ba56c2 | 101 | |
4369c64c HR |
102 | for (v = vals; v != vals + count; v++) { |
103 | if (handler->filter && | |
104 | handler->filter(handle, v->type, v->code, v->value)) | |
105 | continue; | |
106 | if (end != v) | |
107 | *end = *v; | |
108 | end++; | |
109 | } | |
1da177e4 | 110 | |
4369c64c HR |
111 | count = end - vals; |
112 | if (!count) | |
113 | return 0; | |
ef7995f4 | 114 | |
4369c64c HR |
115 | if (handler->events) |
116 | handler->events(handle, vals, count); | |
117 | else if (handler->event) | |
118 | for (v = vals; v != end; v++) | |
119 | handler->event(handle, v->type, v->code, v->value); | |
ef7995f4 | 120 | |
4369c64c HR |
121 | return count; |
122 | } | |
ef7995f4 | 123 | |
4369c64c HR |
124 | /* |
125 | * Pass values first through all filters and then, if event has not been | |
126 | * filtered out, through all open handles. This function is called with | |
127 | * dev->event_lock held and interrupts disabled. | |
128 | */ | |
129 | static void input_pass_values(struct input_dev *dev, | |
130 | struct input_value *vals, unsigned int count) | |
8006479c | 131 | { |
82ba56c2 | 132 | struct input_handle *handle; |
4369c64c | 133 | struct input_value *v; |
ef7995f4 | 134 | |
4369c64c HR |
135 | if (!count) |
136 | return; | |
82ba56c2 DT |
137 | |
138 | rcu_read_lock(); | |
1da177e4 | 139 | |
82ba56c2 | 140 | handle = rcu_dereference(dev->grab); |
4369c64c HR |
141 | if (handle) { |
142 | count = input_to_handler(handle, vals, count); | |
143 | } else { | |
144 | list_for_each_entry_rcu(handle, &dev->h_list, d_node) | |
145 | if (handle->open) | |
146 | count = input_to_handler(handle, vals, count); | |
ef7995f4 | 147 | } |
ef7995f4 | 148 | |
82ba56c2 | 149 | rcu_read_unlock(); |
ef7995f4 | 150 | |
4369c64c | 151 | add_input_randomness(vals->type, vals->code, vals->value); |
ef7995f4 | 152 | |
352ac4bd | 153 | /* trigger auto repeat for key events */ |
4369c64c HR |
154 | for (v = vals; v != vals + count; v++) { |
155 | if (v->type == EV_KEY && v->value != 2) { | |
156 | if (v->value) | |
157 | input_start_autorepeat(dev, v->code); | |
158 | else | |
159 | input_stop_autorepeat(dev); | |
ef7995f4 DT |
160 | } |
161 | } | |
4369c64c | 162 | } |
ef7995f4 | 163 | |
4369c64c HR |
164 | static void input_pass_event(struct input_dev *dev, |
165 | unsigned int type, unsigned int code, int value) | |
166 | { | |
167 | struct input_value vals[] = { { type, code, value } }; | |
168 | ||
169 | input_pass_values(dev, vals, ARRAY_SIZE(vals)); | |
8006479c | 170 | } |
1da177e4 | 171 | |
8006479c DT |
172 | /* |
173 | * Generate software autorepeat event. Note that we take | |
174 | * dev->event_lock here to avoid racing with input_event | |
175 | * which may cause keys get "stuck". | |
176 | */ | |
177 | static void input_repeat_key(unsigned long data) | |
178 | { | |
179 | struct input_dev *dev = (void *) data; | |
180 | unsigned long flags; | |
1da177e4 | 181 | |
8006479c | 182 | spin_lock_irqsave(&dev->event_lock, flags); |
1da177e4 | 183 | |
8006479c DT |
184 | if (test_bit(dev->repeat_key, dev->key) && |
185 | is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) { | |
4369c64c HR |
186 | struct input_value vals[] = { |
187 | { EV_KEY, dev->repeat_key, 2 }, | |
188 | input_value_sync | |
189 | }; | |
1da177e4 | 190 | |
4369c64c | 191 | input_pass_values(dev, vals, ARRAY_SIZE(vals)); |
31581066 | 192 | |
8006479c DT |
193 | if (dev->rep[REP_PERIOD]) |
194 | mod_timer(&dev->timer, jiffies + | |
195 | msecs_to_jiffies(dev->rep[REP_PERIOD])); | |
196 | } | |
31581066 | 197 | |
8006479c DT |
198 | spin_unlock_irqrestore(&dev->event_lock, flags); |
199 | } | |
31581066 | 200 | |
8006479c DT |
201 | #define INPUT_IGNORE_EVENT 0 |
202 | #define INPUT_PASS_TO_HANDLERS 1 | |
203 | #define INPUT_PASS_TO_DEVICE 2 | |
4369c64c HR |
204 | #define INPUT_SLOT 4 |
205 | #define INPUT_FLUSH 8 | |
8006479c | 206 | #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE) |
1da177e4 | 207 | |
40d007e7 HR |
208 | static int input_handle_abs_event(struct input_dev *dev, |
209 | unsigned int code, int *pval) | |
210 | { | |
8d18fba2 | 211 | struct input_mt *mt = dev->mt; |
40d007e7 HR |
212 | bool is_mt_event; |
213 | int *pold; | |
214 | ||
215 | if (code == ABS_MT_SLOT) { | |
216 | /* | |
217 | * "Stage" the event; we'll flush it later, when we | |
144c0f88 | 218 | * get actual touch data. |
40d007e7 | 219 | */ |
8d18fba2 HR |
220 | if (mt && *pval >= 0 && *pval < mt->num_slots) |
221 | mt->slot = *pval; | |
40d007e7 HR |
222 | |
223 | return INPUT_IGNORE_EVENT; | |
224 | } | |
225 | ||
b89529a1 | 226 | is_mt_event = input_is_mt_value(code); |
40d007e7 HR |
227 | |
228 | if (!is_mt_event) { | |
d31b2865 | 229 | pold = &dev->absinfo[code].value; |
8d18fba2 HR |
230 | } else if (mt) { |
231 | pold = &mt->slots[mt->slot].abs[code - ABS_MT_FIRST]; | |
40d007e7 HR |
232 | } else { |
233 | /* | |
144c0f88 | 234 | * Bypass filtering for multi-touch events when |
40d007e7 HR |
235 | * not employing slots. |
236 | */ | |
237 | pold = NULL; | |
238 | } | |
239 | ||
240 | if (pold) { | |
241 | *pval = input_defuzz_abs_event(*pval, *pold, | |
d31b2865 | 242 | dev->absinfo[code].fuzz); |
40d007e7 HR |
243 | if (*pold == *pval) |
244 | return INPUT_IGNORE_EVENT; | |
245 | ||
246 | *pold = *pval; | |
247 | } | |
248 | ||
249 | /* Flush pending "slot" event */ | |
8d18fba2 HR |
250 | if (is_mt_event && mt && mt->slot != input_abs_get_val(dev, ABS_MT_SLOT)) { |
251 | input_abs_set_val(dev, ABS_MT_SLOT, mt->slot); | |
4369c64c | 252 | return INPUT_PASS_TO_HANDLERS | INPUT_SLOT; |
40d007e7 HR |
253 | } |
254 | ||
255 | return INPUT_PASS_TO_HANDLERS; | |
256 | } | |
257 | ||
4369c64c HR |
258 | static int input_get_disposition(struct input_dev *dev, |
259 | unsigned int type, unsigned int code, int value) | |
8006479c DT |
260 | { |
261 | int disposition = INPUT_IGNORE_EVENT; | |
1da177e4 | 262 | |
8006479c | 263 | switch (type) { |
1da177e4 | 264 | |
8006479c DT |
265 | case EV_SYN: |
266 | switch (code) { | |
267 | case SYN_CONFIG: | |
268 | disposition = INPUT_PASS_TO_ALL; | |
269 | break; | |
1da177e4 | 270 | |
8006479c | 271 | case SYN_REPORT: |
4369c64c | 272 | disposition = INPUT_PASS_TO_HANDLERS | INPUT_FLUSH; |
1da177e4 | 273 | break; |
5e5ee686 | 274 | case SYN_MT_REPORT: |
5e5ee686 HR |
275 | disposition = INPUT_PASS_TO_HANDLERS; |
276 | break; | |
8006479c DT |
277 | } |
278 | break; | |
1da177e4 | 279 | |
8006479c | 280 | case EV_KEY: |
0672120a | 281 | if (is_event_supported(code, dev->keybit, KEY_MAX)) { |
1da177e4 | 282 | |
0672120a HR |
283 | /* auto-repeat bypasses state updates */ |
284 | if (value == 2) { | |
285 | disposition = INPUT_PASS_TO_HANDLERS; | |
286 | break; | |
8006479c | 287 | } |
1da177e4 | 288 | |
0672120a | 289 | if (!!test_bit(code, dev->key) != !!value) { |
1da177e4 | 290 | |
8006479c | 291 | __change_bit(code, dev->key); |
0672120a | 292 | disposition = INPUT_PASS_TO_HANDLERS; |
8006479c | 293 | } |
8006479c DT |
294 | } |
295 | break; | |
1da177e4 | 296 | |
8006479c DT |
297 | case EV_SW: |
298 | if (is_event_supported(code, dev->swbit, SW_MAX) && | |
0672120a | 299 | !!test_bit(code, dev->sw) != !!value) { |
1da177e4 | 300 | |
8006479c DT |
301 | __change_bit(code, dev->sw); |
302 | disposition = INPUT_PASS_TO_HANDLERS; | |
303 | } | |
304 | break; | |
1da177e4 | 305 | |
8006479c | 306 | case EV_ABS: |
40d007e7 | 307 | if (is_event_supported(code, dev->absbit, ABS_MAX)) |
9ae4345a | 308 | disposition = input_handle_abs_event(dev, code, &value); |
61994a61 | 309 | |
8006479c | 310 | break; |
1da177e4 | 311 | |
8006479c DT |
312 | case EV_REL: |
313 | if (is_event_supported(code, dev->relbit, REL_MAX) && value) | |
314 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 315 | |
8006479c | 316 | break; |
1e0afb28 | 317 | |
8006479c DT |
318 | case EV_MSC: |
319 | if (is_event_supported(code, dev->mscbit, MSC_MAX)) | |
320 | disposition = INPUT_PASS_TO_ALL; | |
1da177e4 | 321 | |
8006479c | 322 | break; |
1da177e4 | 323 | |
8006479c DT |
324 | case EV_LED: |
325 | if (is_event_supported(code, dev->ledbit, LED_MAX) && | |
0672120a | 326 | !!test_bit(code, dev->led) != !!value) { |
1da177e4 | 327 | |
8006479c DT |
328 | __change_bit(code, dev->led); |
329 | disposition = INPUT_PASS_TO_ALL; | |
330 | } | |
331 | break; | |
332 | ||
333 | case EV_SND: | |
334 | if (is_event_supported(code, dev->sndbit, SND_MAX)) { | |
1da177e4 | 335 | |
8fdc1948 | 336 | if (!!test_bit(code, dev->snd) != !!value) |
8006479c DT |
337 | __change_bit(code, dev->snd); |
338 | disposition = INPUT_PASS_TO_ALL; | |
339 | } | |
340 | break; | |
8fdc1948 | 341 | |
8006479c DT |
342 | case EV_REP: |
343 | if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) { | |
344 | dev->rep[code] = value; | |
345 | disposition = INPUT_PASS_TO_ALL; | |
346 | } | |
347 | break; | |
1da177e4 | 348 | |
8006479c DT |
349 | case EV_FF: |
350 | if (value >= 0) | |
351 | disposition = INPUT_PASS_TO_ALL; | |
352 | break; | |
ed2fa4dd RP |
353 | |
354 | case EV_PWR: | |
355 | disposition = INPUT_PASS_TO_ALL; | |
356 | break; | |
8006479c | 357 | } |
1da177e4 | 358 | |
4369c64c HR |
359 | return disposition; |
360 | } | |
361 | ||
362 | static void input_handle_event(struct input_dev *dev, | |
363 | unsigned int type, unsigned int code, int value) | |
364 | { | |
365 | int disposition; | |
366 | ||
367 | disposition = input_get_disposition(dev, type, code, value); | |
1da177e4 | 368 | |
8006479c DT |
369 | if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event) |
370 | dev->event(dev, type, code, value); | |
1da177e4 | 371 | |
4369c64c HR |
372 | if (!dev->vals) |
373 | return; | |
374 | ||
375 | if (disposition & INPUT_PASS_TO_HANDLERS) { | |
376 | struct input_value *v; | |
377 | ||
378 | if (disposition & INPUT_SLOT) { | |
379 | v = &dev->vals[dev->num_vals++]; | |
380 | v->type = EV_ABS; | |
381 | v->code = ABS_MT_SLOT; | |
382 | v->value = dev->mt->slot; | |
383 | } | |
384 | ||
385 | v = &dev->vals[dev->num_vals++]; | |
386 | v->type = type; | |
387 | v->code = code; | |
388 | v->value = value; | |
389 | } | |
390 | ||
391 | if (disposition & INPUT_FLUSH) { | |
392 | if (dev->num_vals >= 2) | |
393 | input_pass_values(dev, dev->vals, dev->num_vals); | |
394 | dev->num_vals = 0; | |
395 | } else if (dev->num_vals >= dev->max_vals - 2) { | |
396 | dev->vals[dev->num_vals++] = input_value_sync; | |
397 | input_pass_values(dev, dev->vals, dev->num_vals); | |
398 | dev->num_vals = 0; | |
399 | } | |
400 | ||
8006479c | 401 | } |
1da177e4 | 402 | |
8006479c DT |
403 | /** |
404 | * input_event() - report new input event | |
405 | * @dev: device that generated the event | |
406 | * @type: type of the event | |
407 | * @code: event code | |
408 | * @value: value of the event | |
409 | * | |
410 | * This function should be used by drivers implementing various input | |
df2d4637 DT |
411 | * devices to report input events. See also input_inject_event(). |
412 | * | |
413 | * NOTE: input_event() may be safely used right after input device was | |
414 | * allocated with input_allocate_device(), even before it is registered | |
415 | * with input_register_device(), but the event will not reach any of the | |
416 | * input handlers. Such early invocation of input_event() may be used | |
417 | * to 'seed' initial state of a switch or initial position of absolute | |
418 | * axis, etc. | |
8006479c | 419 | */ |
8006479c DT |
420 | void input_event(struct input_dev *dev, |
421 | unsigned int type, unsigned int code, int value) | |
422 | { | |
423 | unsigned long flags; | |
509ca1a9 | 424 | |
8006479c | 425 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
509ca1a9 | 426 | |
8006479c | 427 | spin_lock_irqsave(&dev->event_lock, flags); |
9ae4345a | 428 | input_handle_event(dev, type, code, value); |
8006479c | 429 | spin_unlock_irqrestore(&dev->event_lock, flags); |
1da177e4 | 430 | } |
1da177e4 | 431 | } |
ca56fe07 | 432 | EXPORT_SYMBOL(input_event); |
1da177e4 | 433 | |
0e739d28 DT |
434 | /** |
435 | * input_inject_event() - send input event from input handler | |
436 | * @handle: input handle to send event through | |
437 | * @type: type of the event | |
438 | * @code: event code | |
439 | * @value: value of the event | |
440 | * | |
8006479c DT |
441 | * Similar to input_event() but will ignore event if device is |
442 | * "grabbed" and handle injecting event is not the one that owns | |
443 | * the device. | |
0e739d28 | 444 | */ |
8006479c DT |
445 | void input_inject_event(struct input_handle *handle, |
446 | unsigned int type, unsigned int code, int value) | |
1da177e4 | 447 | { |
8006479c DT |
448 | struct input_dev *dev = handle->dev; |
449 | struct input_handle *grab; | |
450 | unsigned long flags; | |
1da177e4 | 451 | |
8006479c DT |
452 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
453 | spin_lock_irqsave(&dev->event_lock, flags); | |
1da177e4 | 454 | |
82ba56c2 | 455 | rcu_read_lock(); |
8006479c DT |
456 | grab = rcu_dereference(dev->grab); |
457 | if (!grab || grab == handle) | |
9ae4345a | 458 | input_handle_event(dev, type, code, value); |
82ba56c2 | 459 | rcu_read_unlock(); |
1da177e4 | 460 | |
8006479c DT |
461 | spin_unlock_irqrestore(&dev->event_lock, flags); |
462 | } | |
1da177e4 | 463 | } |
8006479c | 464 | EXPORT_SYMBOL(input_inject_event); |
1da177e4 | 465 | |
d31b2865 DM |
466 | /** |
467 | * input_alloc_absinfo - allocates array of input_absinfo structs | |
468 | * @dev: the input device emitting absolute events | |
469 | * | |
470 | * If the absinfo struct the caller asked for is already allocated, this | |
471 | * functions will not do anything. | |
472 | */ | |
473 | void input_alloc_absinfo(struct input_dev *dev) | |
474 | { | |
475 | if (!dev->absinfo) | |
476 | dev->absinfo = kcalloc(ABS_CNT, sizeof(struct input_absinfo), | |
477 | GFP_KERNEL); | |
478 | ||
479 | WARN(!dev->absinfo, "%s(): kcalloc() failed?\n", __func__); | |
480 | } | |
481 | EXPORT_SYMBOL(input_alloc_absinfo); | |
482 | ||
483 | void input_set_abs_params(struct input_dev *dev, unsigned int axis, | |
484 | int min, int max, int fuzz, int flat) | |
485 | { | |
486 | struct input_absinfo *absinfo; | |
487 | ||
488 | input_alloc_absinfo(dev); | |
489 | if (!dev->absinfo) | |
490 | return; | |
491 | ||
492 | absinfo = &dev->absinfo[axis]; | |
493 | absinfo->minimum = min; | |
494 | absinfo->maximum = max; | |
495 | absinfo->fuzz = fuzz; | |
496 | absinfo->flat = flat; | |
497 | ||
498 | dev->absbit[BIT_WORD(axis)] |= BIT_MASK(axis); | |
499 | } | |
500 | EXPORT_SYMBOL(input_set_abs_params); | |
501 | ||
502 | ||
8006479c DT |
503 | /** |
504 | * input_grab_device - grabs device for exclusive use | |
505 | * @handle: input handle that wants to own the device | |
506 | * | |
507 | * When a device is grabbed by an input handle all events generated by | |
508 | * the device are delivered only to this handle. Also events injected | |
509 | * by other input handles are ignored while device is grabbed. | |
510 | */ | |
1da177e4 LT |
511 | int input_grab_device(struct input_handle *handle) |
512 | { | |
8006479c DT |
513 | struct input_dev *dev = handle->dev; |
514 | int retval; | |
1da177e4 | 515 | |
8006479c DT |
516 | retval = mutex_lock_interruptible(&dev->mutex); |
517 | if (retval) | |
518 | return retval; | |
519 | ||
520 | if (dev->grab) { | |
521 | retval = -EBUSY; | |
522 | goto out; | |
523 | } | |
524 | ||
525 | rcu_assign_pointer(dev->grab, handle); | |
8006479c DT |
526 | |
527 | out: | |
528 | mutex_unlock(&dev->mutex); | |
529 | return retval; | |
1da177e4 | 530 | } |
ca56fe07 | 531 | EXPORT_SYMBOL(input_grab_device); |
1da177e4 | 532 | |
8006479c | 533 | static void __input_release_device(struct input_handle *handle) |
1da177e4 | 534 | { |
a2b2ed2c | 535 | struct input_dev *dev = handle->dev; |
c7e8dc6e | 536 | |
a2b2ed2c | 537 | if (dev->grab == handle) { |
8006479c DT |
538 | rcu_assign_pointer(dev->grab, NULL); |
539 | /* Make sure input_pass_event() notices that grab is gone */ | |
82ba56c2 | 540 | synchronize_rcu(); |
a2b2ed2c AM |
541 | |
542 | list_for_each_entry(handle, &dev->h_list, d_node) | |
8006479c | 543 | if (handle->open && handle->handler->start) |
c7e8dc6e DT |
544 | handle->handler->start(handle); |
545 | } | |
1da177e4 | 546 | } |
8006479c DT |
547 | |
548 | /** | |
549 | * input_release_device - release previously grabbed device | |
550 | * @handle: input handle that owns the device | |
551 | * | |
552 | * Releases previously grabbed device so that other input handles can | |
553 | * start receiving input events. Upon release all handlers attached | |
554 | * to the device have their start() method called so they have a change | |
555 | * to synchronize device state with the rest of the system. | |
556 | */ | |
557 | void input_release_device(struct input_handle *handle) | |
558 | { | |
559 | struct input_dev *dev = handle->dev; | |
560 | ||
561 | mutex_lock(&dev->mutex); | |
562 | __input_release_device(handle); | |
563 | mutex_unlock(&dev->mutex); | |
564 | } | |
ca56fe07 | 565 | EXPORT_SYMBOL(input_release_device); |
1da177e4 | 566 | |
8006479c DT |
567 | /** |
568 | * input_open_device - open input device | |
569 | * @handle: handle through which device is being accessed | |
570 | * | |
571 | * This function should be called by input handlers when they | |
572 | * want to start receive events from given input device. | |
573 | */ | |
1da177e4 LT |
574 | int input_open_device(struct input_handle *handle) |
575 | { | |
0fbf87ca | 576 | struct input_dev *dev = handle->dev; |
8006479c | 577 | int retval; |
0fbf87ca | 578 | |
8006479c DT |
579 | retval = mutex_lock_interruptible(&dev->mutex); |
580 | if (retval) | |
581 | return retval; | |
582 | ||
583 | if (dev->going_away) { | |
584 | retval = -ENODEV; | |
585 | goto out; | |
586 | } | |
0fbf87ca | 587 | |
1da177e4 | 588 | handle->open++; |
0fbf87ca DT |
589 | |
590 | if (!dev->users++ && dev->open) | |
8006479c DT |
591 | retval = dev->open(dev); |
592 | ||
593 | if (retval) { | |
594 | dev->users--; | |
595 | if (!--handle->open) { | |
596 | /* | |
597 | * Make sure we are not delivering any more events | |
598 | * through this handle | |
599 | */ | |
82ba56c2 | 600 | synchronize_rcu(); |
8006479c DT |
601 | } |
602 | } | |
0fbf87ca | 603 | |
8006479c | 604 | out: |
e676c232 | 605 | mutex_unlock(&dev->mutex); |
8006479c | 606 | return retval; |
1da177e4 | 607 | } |
ca56fe07 | 608 | EXPORT_SYMBOL(input_open_device); |
1da177e4 | 609 | |
8006479c | 610 | int input_flush_device(struct input_handle *handle, struct file *file) |
1da177e4 | 611 | { |
8006479c DT |
612 | struct input_dev *dev = handle->dev; |
613 | int retval; | |
1da177e4 | 614 | |
8006479c DT |
615 | retval = mutex_lock_interruptible(&dev->mutex); |
616 | if (retval) | |
617 | return retval; | |
618 | ||
619 | if (dev->flush) | |
620 | retval = dev->flush(dev, file); | |
621 | ||
622 | mutex_unlock(&dev->mutex); | |
623 | return retval; | |
1da177e4 | 624 | } |
ca56fe07 | 625 | EXPORT_SYMBOL(input_flush_device); |
1da177e4 | 626 | |
8006479c DT |
627 | /** |
628 | * input_close_device - close input device | |
629 | * @handle: handle through which device is being accessed | |
630 | * | |
631 | * This function should be called by input handlers when they | |
632 | * want to stop receive events from given input device. | |
633 | */ | |
1da177e4 LT |
634 | void input_close_device(struct input_handle *handle) |
635 | { | |
0fbf87ca DT |
636 | struct input_dev *dev = handle->dev; |
637 | ||
e676c232 | 638 | mutex_lock(&dev->mutex); |
0fbf87ca | 639 | |
8006479c DT |
640 | __input_release_device(handle); |
641 | ||
0fbf87ca DT |
642 | if (!--dev->users && dev->close) |
643 | dev->close(dev); | |
8006479c DT |
644 | |
645 | if (!--handle->open) { | |
646 | /* | |
82ba56c2 | 647 | * synchronize_rcu() makes sure that input_pass_event() |
8006479c DT |
648 | * completed and that no more input events are delivered |
649 | * through this handle | |
650 | */ | |
82ba56c2 | 651 | synchronize_rcu(); |
8006479c | 652 | } |
0fbf87ca | 653 | |
e676c232 | 654 | mutex_unlock(&dev->mutex); |
1da177e4 | 655 | } |
ca56fe07 | 656 | EXPORT_SYMBOL(input_close_device); |
1da177e4 | 657 | |
866d7d7b ON |
658 | /* |
659 | * Simulate keyup events for all keys that are marked as pressed. | |
660 | * The function must be called with dev->event_lock held. | |
661 | */ | |
662 | static void input_dev_release_keys(struct input_dev *dev) | |
663 | { | |
664 | int code; | |
665 | ||
666 | if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) { | |
667 | for (code = 0; code <= KEY_MAX; code++) { | |
668 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
669 | __test_and_clear_bit(code, dev->key)) { | |
9ae4345a | 670 | input_pass_event(dev, EV_KEY, code, 0); |
866d7d7b ON |
671 | } |
672 | } | |
9ae4345a | 673 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); |
866d7d7b ON |
674 | } |
675 | } | |
676 | ||
8006479c DT |
677 | /* |
678 | * Prepare device for unregistering | |
679 | */ | |
680 | static void input_disconnect_device(struct input_dev *dev) | |
681 | { | |
682 | struct input_handle *handle; | |
8006479c DT |
683 | |
684 | /* | |
685 | * Mark device as going away. Note that we take dev->mutex here | |
686 | * not to protect access to dev->going_away but rather to ensure | |
687 | * that there are no threads in the middle of input_open_device() | |
688 | */ | |
689 | mutex_lock(&dev->mutex); | |
ffd0db97 | 690 | dev->going_away = true; |
8006479c DT |
691 | mutex_unlock(&dev->mutex); |
692 | ||
693 | spin_lock_irq(&dev->event_lock); | |
694 | ||
695 | /* | |
696 | * Simulate keyup events for all pressed keys so that handlers | |
697 | * are not left with "stuck" keys. The driver may continue | |
698 | * generate events even after we done here but they will not | |
699 | * reach any handlers. | |
700 | */ | |
866d7d7b | 701 | input_dev_release_keys(dev); |
8006479c DT |
702 | |
703 | list_for_each_entry(handle, &dev->h_list, d_node) | |
704 | handle->open = 0; | |
705 | ||
706 | spin_unlock_irq(&dev->event_lock); | |
707 | } | |
708 | ||
8613e4c2 MCC |
709 | /** |
710 | * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry | |
711 | * @ke: keymap entry containing scancode to be converted. | |
712 | * @scancode: pointer to the location where converted scancode should | |
713 | * be stored. | |
714 | * | |
715 | * This function is used to convert scancode stored in &struct keymap_entry | |
716 | * into scalar form understood by legacy keymap handling methods. These | |
717 | * methods expect scancodes to be represented as 'unsigned int'. | |
718 | */ | |
719 | int input_scancode_to_scalar(const struct input_keymap_entry *ke, | |
720 | unsigned int *scancode) | |
721 | { | |
722 | switch (ke->len) { | |
723 | case 1: | |
724 | *scancode = *((u8 *)ke->scancode); | |
725 | break; | |
726 | ||
727 | case 2: | |
728 | *scancode = *((u16 *)ke->scancode); | |
729 | break; | |
730 | ||
731 | case 4: | |
732 | *scancode = *((u32 *)ke->scancode); | |
733 | break; | |
734 | ||
735 | default: | |
736 | return -EINVAL; | |
737 | } | |
738 | ||
739 | return 0; | |
740 | } | |
741 | EXPORT_SYMBOL(input_scancode_to_scalar); | |
742 | ||
743 | /* | |
744 | * Those routines handle the default case where no [gs]etkeycode() is | |
745 | * defined. In this case, an array indexed by the scancode is used. | |
746 | */ | |
747 | ||
748 | static unsigned int input_fetch_keycode(struct input_dev *dev, | |
749 | unsigned int index) | |
c8e4c772 MR |
750 | { |
751 | switch (dev->keycodesize) { | |
8613e4c2 MCC |
752 | case 1: |
753 | return ((u8 *)dev->keycode)[index]; | |
c8e4c772 | 754 | |
8613e4c2 MCC |
755 | case 2: |
756 | return ((u16 *)dev->keycode)[index]; | |
c8e4c772 | 757 | |
8613e4c2 MCC |
758 | default: |
759 | return ((u32 *)dev->keycode)[index]; | |
c8e4c772 MR |
760 | } |
761 | } | |
762 | ||
763 | static int input_default_getkeycode(struct input_dev *dev, | |
8613e4c2 | 764 | struct input_keymap_entry *ke) |
c8e4c772 | 765 | { |
8613e4c2 MCC |
766 | unsigned int index; |
767 | int error; | |
768 | ||
c8e4c772 MR |
769 | if (!dev->keycodesize) |
770 | return -EINVAL; | |
771 | ||
8613e4c2 MCC |
772 | if (ke->flags & INPUT_KEYMAP_BY_INDEX) |
773 | index = ke->index; | |
774 | else { | |
775 | error = input_scancode_to_scalar(ke, &index); | |
776 | if (error) | |
777 | return error; | |
778 | } | |
779 | ||
780 | if (index >= dev->keycodemax) | |
c8e4c772 MR |
781 | return -EINVAL; |
782 | ||
8613e4c2 MCC |
783 | ke->keycode = input_fetch_keycode(dev, index); |
784 | ke->index = index; | |
785 | ke->len = sizeof(index); | |
786 | memcpy(ke->scancode, &index, sizeof(index)); | |
c8e4c772 MR |
787 | |
788 | return 0; | |
789 | } | |
790 | ||
791 | static int input_default_setkeycode(struct input_dev *dev, | |
8613e4c2 MCC |
792 | const struct input_keymap_entry *ke, |
793 | unsigned int *old_keycode) | |
c8e4c772 | 794 | { |
8613e4c2 MCC |
795 | unsigned int index; |
796 | int error; | |
c8e4c772 MR |
797 | int i; |
798 | ||
8613e4c2 | 799 | if (!dev->keycodesize) |
c8e4c772 MR |
800 | return -EINVAL; |
801 | ||
8613e4c2 MCC |
802 | if (ke->flags & INPUT_KEYMAP_BY_INDEX) { |
803 | index = ke->index; | |
804 | } else { | |
805 | error = input_scancode_to_scalar(ke, &index); | |
806 | if (error) | |
807 | return error; | |
808 | } | |
809 | ||
810 | if (index >= dev->keycodemax) | |
c8e4c772 MR |
811 | return -EINVAL; |
812 | ||
de391d12 | 813 | if (dev->keycodesize < sizeof(ke->keycode) && |
8613e4c2 | 814 | (ke->keycode >> (dev->keycodesize * 8))) |
c8e4c772 MR |
815 | return -EINVAL; |
816 | ||
817 | switch (dev->keycodesize) { | |
818 | case 1: { | |
819 | u8 *k = (u8 *)dev->keycode; | |
8613e4c2 MCC |
820 | *old_keycode = k[index]; |
821 | k[index] = ke->keycode; | |
c8e4c772 MR |
822 | break; |
823 | } | |
824 | case 2: { | |
825 | u16 *k = (u16 *)dev->keycode; | |
8613e4c2 MCC |
826 | *old_keycode = k[index]; |
827 | k[index] = ke->keycode; | |
c8e4c772 MR |
828 | break; |
829 | } | |
830 | default: { | |
831 | u32 *k = (u32 *)dev->keycode; | |
8613e4c2 MCC |
832 | *old_keycode = k[index]; |
833 | k[index] = ke->keycode; | |
c8e4c772 MR |
834 | break; |
835 | } | |
836 | } | |
837 | ||
8613e4c2 MCC |
838 | __clear_bit(*old_keycode, dev->keybit); |
839 | __set_bit(ke->keycode, dev->keybit); | |
c8e4c772 MR |
840 | |
841 | for (i = 0; i < dev->keycodemax; i++) { | |
8613e4c2 MCC |
842 | if (input_fetch_keycode(dev, i) == *old_keycode) { |
843 | __set_bit(*old_keycode, dev->keybit); | |
c8e4c772 MR |
844 | break; /* Setting the bit twice is useless, so break */ |
845 | } | |
846 | } | |
847 | ||
848 | return 0; | |
849 | } | |
850 | ||
f4f37c8e DT |
851 | /** |
852 | * input_get_keycode - retrieve keycode currently mapped to a given scancode | |
853 | * @dev: input device which keymap is being queried | |
8613e4c2 | 854 | * @ke: keymap entry |
f4f37c8e DT |
855 | * |
856 | * This function should be called by anyone interested in retrieving current | |
8613e4c2 | 857 | * keymap. Presently evdev handlers use it. |
f4f37c8e | 858 | */ |
8613e4c2 | 859 | int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke) |
f4f37c8e | 860 | { |
2e2e3b96 DT |
861 | unsigned long flags; |
862 | int retval; | |
863 | ||
864 | spin_lock_irqsave(&dev->event_lock, flags); | |
aebd636b | 865 | retval = dev->getkeycode(dev, ke); |
8613e4c2 | 866 | spin_unlock_irqrestore(&dev->event_lock, flags); |
aebd636b | 867 | |
2e2e3b96 | 868 | return retval; |
f4f37c8e DT |
869 | } |
870 | EXPORT_SYMBOL(input_get_keycode); | |
871 | ||
872 | /** | |
8613e4c2 | 873 | * input_set_keycode - attribute a keycode to a given scancode |
f4f37c8e | 874 | * @dev: input device which keymap is being updated |
8613e4c2 | 875 | * @ke: new keymap entry |
f4f37c8e DT |
876 | * |
877 | * This function should be called by anyone needing to update current | |
878 | * keymap. Presently keyboard and evdev handlers use it. | |
879 | */ | |
58b93995 | 880 | int input_set_keycode(struct input_dev *dev, |
8613e4c2 | 881 | const struct input_keymap_entry *ke) |
f4f37c8e DT |
882 | { |
883 | unsigned long flags; | |
fd6cf3dd | 884 | unsigned int old_keycode; |
f4f37c8e DT |
885 | int retval; |
886 | ||
8613e4c2 | 887 | if (ke->keycode > KEY_MAX) |
f4f37c8e DT |
888 | return -EINVAL; |
889 | ||
890 | spin_lock_irqsave(&dev->event_lock, flags); | |
891 | ||
aebd636b | 892 | retval = dev->setkeycode(dev, ke, &old_keycode); |
f4f37c8e DT |
893 | if (retval) |
894 | goto out; | |
895 | ||
4f93df40 DT |
896 | /* Make sure KEY_RESERVED did not get enabled. */ |
897 | __clear_bit(KEY_RESERVED, dev->keybit); | |
898 | ||
f4f37c8e DT |
899 | /* |
900 | * Simulate keyup event if keycode is not present | |
901 | * in the keymap anymore | |
902 | */ | |
903 | if (test_bit(EV_KEY, dev->evbit) && | |
904 | !is_event_supported(old_keycode, dev->keybit, KEY_MAX) && | |
905 | __test_and_clear_bit(old_keycode, dev->key)) { | |
4369c64c HR |
906 | struct input_value vals[] = { |
907 | { EV_KEY, old_keycode, 0 }, | |
908 | input_value_sync | |
909 | }; | |
f4f37c8e | 910 | |
4369c64c | 911 | input_pass_values(dev, vals, ARRAY_SIZE(vals)); |
f4f37c8e DT |
912 | } |
913 | ||
914 | out: | |
915 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
916 | ||
917 | return retval; | |
918 | } | |
919 | EXPORT_SYMBOL(input_set_keycode); | |
c8e4c772 | 920 | |
0b7024ac | 921 | static const struct input_device_id *input_match_device(struct input_handler *handler, |
66e66118 | 922 | struct input_dev *dev) |
1da177e4 | 923 | { |
0b7024ac | 924 | const struct input_device_id *id; |
1da177e4 | 925 | |
0b7024ac | 926 | for (id = handler->id_table; id->flags || id->driver_info; id++) { |
1da177e4 LT |
927 | |
928 | if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) | |
ddc5d341 | 929 | if (id->bustype != dev->id.bustype) |
1da177e4 LT |
930 | continue; |
931 | ||
932 | if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) | |
ddc5d341 | 933 | if (id->vendor != dev->id.vendor) |
1da177e4 LT |
934 | continue; |
935 | ||
936 | if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) | |
ddc5d341 | 937 | if (id->product != dev->id.product) |
1da177e4 LT |
938 | continue; |
939 | ||
940 | if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) | |
ddc5d341 | 941 | if (id->version != dev->id.version) |
1da177e4 LT |
942 | continue; |
943 | ||
c0bb1f97 DT |
944 | if (!bitmap_subset(id->evbit, dev->evbit, EV_MAX)) |
945 | continue; | |
946 | ||
947 | if (!bitmap_subset(id->keybit, dev->keybit, KEY_MAX)) | |
948 | continue; | |
949 | ||
950 | if (!bitmap_subset(id->relbit, dev->relbit, REL_MAX)) | |
951 | continue; | |
952 | ||
953 | if (!bitmap_subset(id->absbit, dev->absbit, ABS_MAX)) | |
954 | continue; | |
955 | ||
956 | if (!bitmap_subset(id->mscbit, dev->mscbit, MSC_MAX)) | |
957 | continue; | |
958 | ||
959 | if (!bitmap_subset(id->ledbit, dev->ledbit, LED_MAX)) | |
960 | continue; | |
961 | ||
962 | if (!bitmap_subset(id->sndbit, dev->sndbit, SND_MAX)) | |
963 | continue; | |
964 | ||
965 | if (!bitmap_subset(id->ffbit, dev->ffbit, FF_MAX)) | |
966 | continue; | |
967 | ||
968 | if (!bitmap_subset(id->swbit, dev->swbit, SW_MAX)) | |
969 | continue; | |
1da177e4 | 970 | |
0b7024ac DT |
971 | if (!handler->match || handler->match(handler, dev)) |
972 | return id; | |
1da177e4 LT |
973 | } |
974 | ||
975 | return NULL; | |
976 | } | |
977 | ||
5b2a0826 DT |
978 | static int input_attach_handler(struct input_dev *dev, struct input_handler *handler) |
979 | { | |
980 | const struct input_device_id *id; | |
981 | int error; | |
982 | ||
0b7024ac | 983 | id = input_match_device(handler, dev); |
5b2a0826 DT |
984 | if (!id) |
985 | return -ENODEV; | |
986 | ||
987 | error = handler->connect(handler, dev, id); | |
988 | if (error && error != -ENODEV) | |
da0c4901 JP |
989 | pr_err("failed to attach handler %s to device %s, error: %d\n", |
990 | handler->name, kobject_name(&dev->dev.kobj), error); | |
5b2a0826 DT |
991 | |
992 | return error; | |
993 | } | |
994 | ||
15e184af DT |
995 | #ifdef CONFIG_COMPAT |
996 | ||
997 | static int input_bits_to_string(char *buf, int buf_size, | |
998 | unsigned long bits, bool skip_empty) | |
999 | { | |
1000 | int len = 0; | |
1001 | ||
1002 | if (INPUT_COMPAT_TEST) { | |
1003 | u32 dword = bits >> 32; | |
1004 | if (dword || !skip_empty) | |
1005 | len += snprintf(buf, buf_size, "%x ", dword); | |
1006 | ||
1007 | dword = bits & 0xffffffffUL; | |
1008 | if (dword || !skip_empty || len) | |
1009 | len += snprintf(buf + len, max(buf_size - len, 0), | |
1010 | "%x", dword); | |
1011 | } else { | |
1012 | if (bits || !skip_empty) | |
1013 | len += snprintf(buf, buf_size, "%lx", bits); | |
1014 | } | |
1015 | ||
1016 | return len; | |
1017 | } | |
1018 | ||
1019 | #else /* !CONFIG_COMPAT */ | |
1020 | ||
1021 | static int input_bits_to_string(char *buf, int buf_size, | |
1022 | unsigned long bits, bool skip_empty) | |
1023 | { | |
1024 | return bits || !skip_empty ? | |
1025 | snprintf(buf, buf_size, "%lx", bits) : 0; | |
1026 | } | |
1027 | ||
1028 | #endif | |
5b2a0826 | 1029 | |
f96b434d DT |
1030 | #ifdef CONFIG_PROC_FS |
1031 | ||
1032 | static struct proc_dir_entry *proc_bus_input_dir; | |
1033 | static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); | |
1034 | static int input_devices_state; | |
1035 | ||
1036 | static inline void input_wakeup_procfs_readers(void) | |
1037 | { | |
1038 | input_devices_state++; | |
1039 | wake_up(&input_devices_poll_wait); | |
1040 | } | |
1041 | ||
969b21cd | 1042 | static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait) |
f96b434d | 1043 | { |
f96b434d | 1044 | poll_wait(file, &input_devices_poll_wait, wait); |
fa886612 DT |
1045 | if (file->f_version != input_devices_state) { |
1046 | file->f_version = input_devices_state; | |
f96b434d | 1047 | return POLLIN | POLLRDNORM; |
fa886612 | 1048 | } |
1e0afb28 | 1049 | |
f96b434d DT |
1050 | return 0; |
1051 | } | |
1052 | ||
1572ca2a DT |
1053 | union input_seq_state { |
1054 | struct { | |
1055 | unsigned short pos; | |
1056 | bool mutex_acquired; | |
1057 | }; | |
1058 | void *p; | |
1059 | }; | |
1060 | ||
969b21cd DT |
1061 | static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) |
1062 | { | |
1572ca2a DT |
1063 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1064 | int error; | |
1065 | ||
1066 | /* We need to fit into seq->private pointer */ | |
1067 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
1068 | ||
1069 | error = mutex_lock_interruptible(&input_mutex); | |
1070 | if (error) { | |
1071 | state->mutex_acquired = false; | |
1072 | return ERR_PTR(error); | |
1073 | } | |
1074 | ||
1075 | state->mutex_acquired = true; | |
f96b434d | 1076 | |
ad5d972c | 1077 | return seq_list_start(&input_dev_list, *pos); |
969b21cd | 1078 | } |
051b2fea | 1079 | |
969b21cd DT |
1080 | static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1081 | { | |
ad5d972c | 1082 | return seq_list_next(v, &input_dev_list, pos); |
969b21cd | 1083 | } |
f96b434d | 1084 | |
1572ca2a | 1085 | static void input_seq_stop(struct seq_file *seq, void *v) |
969b21cd | 1086 | { |
1572ca2a DT |
1087 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1088 | ||
1089 | if (state->mutex_acquired) | |
1090 | mutex_unlock(&input_mutex); | |
969b21cd | 1091 | } |
f96b434d | 1092 | |
969b21cd DT |
1093 | static void input_seq_print_bitmap(struct seq_file *seq, const char *name, |
1094 | unsigned long *bitmap, int max) | |
1095 | { | |
1096 | int i; | |
15e184af DT |
1097 | bool skip_empty = true; |
1098 | char buf[18]; | |
f96b434d | 1099 | |
969b21cd | 1100 | seq_printf(seq, "B: %s=", name); |
15e184af DT |
1101 | |
1102 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
1103 | if (input_bits_to_string(buf, sizeof(buf), | |
1104 | bitmap[i], skip_empty)) { | |
1105 | skip_empty = false; | |
1106 | seq_printf(seq, "%s%s", buf, i > 0 ? " " : ""); | |
1107 | } | |
1108 | } | |
1109 | ||
1110 | /* | |
1111 | * If no output was produced print a single 0. | |
1112 | */ | |
1113 | if (skip_empty) | |
1114 | seq_puts(seq, "0"); | |
1115 | ||
969b21cd DT |
1116 | seq_putc(seq, '\n'); |
1117 | } | |
f96b434d | 1118 | |
969b21cd DT |
1119 | static int input_devices_seq_show(struct seq_file *seq, void *v) |
1120 | { | |
1121 | struct input_dev *dev = container_of(v, struct input_dev, node); | |
9657d75c | 1122 | const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
969b21cd DT |
1123 | struct input_handle *handle; |
1124 | ||
1125 | seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", | |
1126 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); | |
1127 | ||
1128 | seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); | |
1129 | seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : ""); | |
1130 | seq_printf(seq, "S: Sysfs=%s\n", path ? path : ""); | |
15e03ae8 | 1131 | seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : ""); |
969b21cd DT |
1132 | seq_printf(seq, "H: Handlers="); |
1133 | ||
1134 | list_for_each_entry(handle, &dev->h_list, d_node) | |
1135 | seq_printf(seq, "%s ", handle->name); | |
1136 | seq_putc(seq, '\n'); | |
1137 | ||
85b77200 HR |
1138 | input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX); |
1139 | ||
969b21cd DT |
1140 | input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); |
1141 | if (test_bit(EV_KEY, dev->evbit)) | |
1142 | input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); | |
1143 | if (test_bit(EV_REL, dev->evbit)) | |
1144 | input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); | |
1145 | if (test_bit(EV_ABS, dev->evbit)) | |
1146 | input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); | |
1147 | if (test_bit(EV_MSC, dev->evbit)) | |
1148 | input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); | |
1149 | if (test_bit(EV_LED, dev->evbit)) | |
1150 | input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); | |
1151 | if (test_bit(EV_SND, dev->evbit)) | |
1152 | input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); | |
1153 | if (test_bit(EV_FF, dev->evbit)) | |
1154 | input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); | |
1155 | if (test_bit(EV_SW, dev->evbit)) | |
1156 | input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); | |
1157 | ||
1158 | seq_putc(seq, '\n'); | |
1159 | ||
1160 | kfree(path); | |
1161 | return 0; | |
f96b434d DT |
1162 | } |
1163 | ||
cec69c37 | 1164 | static const struct seq_operations input_devices_seq_ops = { |
969b21cd DT |
1165 | .start = input_devices_seq_start, |
1166 | .next = input_devices_seq_next, | |
1572ca2a | 1167 | .stop = input_seq_stop, |
969b21cd DT |
1168 | .show = input_devices_seq_show, |
1169 | }; | |
1170 | ||
1171 | static int input_proc_devices_open(struct inode *inode, struct file *file) | |
f96b434d | 1172 | { |
969b21cd DT |
1173 | return seq_open(file, &input_devices_seq_ops); |
1174 | } | |
1175 | ||
2b8693c0 | 1176 | static const struct file_operations input_devices_fileops = { |
969b21cd DT |
1177 | .owner = THIS_MODULE, |
1178 | .open = input_proc_devices_open, | |
1179 | .poll = input_proc_devices_poll, | |
1180 | .read = seq_read, | |
1181 | .llseek = seq_lseek, | |
1182 | .release = seq_release, | |
1183 | }; | |
1184 | ||
1185 | static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) | |
1186 | { | |
1572ca2a DT |
1187 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1188 | int error; | |
1189 | ||
1190 | /* We need to fit into seq->private pointer */ | |
1191 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
1192 | ||
1193 | error = mutex_lock_interruptible(&input_mutex); | |
1194 | if (error) { | |
1195 | state->mutex_acquired = false; | |
1196 | return ERR_PTR(error); | |
1197 | } | |
1198 | ||
1199 | state->mutex_acquired = true; | |
1200 | state->pos = *pos; | |
8006479c | 1201 | |
ad5d972c | 1202 | return seq_list_start(&input_handler_list, *pos); |
969b21cd | 1203 | } |
f96b434d | 1204 | |
969b21cd DT |
1205 | static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1206 | { | |
1572ca2a | 1207 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
f96b434d | 1208 | |
1572ca2a DT |
1209 | state->pos = *pos + 1; |
1210 | return seq_list_next(v, &input_handler_list, pos); | |
969b21cd DT |
1211 | } |
1212 | ||
1213 | static int input_handlers_seq_show(struct seq_file *seq, void *v) | |
1214 | { | |
1215 | struct input_handler *handler = container_of(v, struct input_handler, node); | |
1572ca2a | 1216 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
969b21cd | 1217 | |
1572ca2a | 1218 | seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name); |
ef7995f4 DT |
1219 | if (handler->filter) |
1220 | seq_puts(seq, " (filter)"); | |
969b21cd DT |
1221 | if (handler->fops) |
1222 | seq_printf(seq, " Minor=%d", handler->minor); | |
1223 | seq_putc(seq, '\n'); | |
1224 | ||
1225 | return 0; | |
1226 | } | |
1572ca2a | 1227 | |
cec69c37 | 1228 | static const struct seq_operations input_handlers_seq_ops = { |
969b21cd DT |
1229 | .start = input_handlers_seq_start, |
1230 | .next = input_handlers_seq_next, | |
1572ca2a | 1231 | .stop = input_seq_stop, |
969b21cd DT |
1232 | .show = input_handlers_seq_show, |
1233 | }; | |
1234 | ||
1235 | static int input_proc_handlers_open(struct inode *inode, struct file *file) | |
1236 | { | |
1237 | return seq_open(file, &input_handlers_seq_ops); | |
1238 | } | |
1239 | ||
2b8693c0 | 1240 | static const struct file_operations input_handlers_fileops = { |
969b21cd DT |
1241 | .owner = THIS_MODULE, |
1242 | .open = input_proc_handlers_open, | |
1243 | .read = seq_read, | |
1244 | .llseek = seq_lseek, | |
1245 | .release = seq_release, | |
1246 | }; | |
f96b434d DT |
1247 | |
1248 | static int __init input_proc_init(void) | |
1249 | { | |
1250 | struct proc_dir_entry *entry; | |
1251 | ||
9c37066d | 1252 | proc_bus_input_dir = proc_mkdir("bus/input", NULL); |
f96b434d DT |
1253 | if (!proc_bus_input_dir) |
1254 | return -ENOMEM; | |
1255 | ||
c7705f34 DL |
1256 | entry = proc_create("devices", 0, proc_bus_input_dir, |
1257 | &input_devices_fileops); | |
f96b434d DT |
1258 | if (!entry) |
1259 | goto fail1; | |
1260 | ||
c7705f34 DL |
1261 | entry = proc_create("handlers", 0, proc_bus_input_dir, |
1262 | &input_handlers_fileops); | |
f96b434d DT |
1263 | if (!entry) |
1264 | goto fail2; | |
1265 | ||
f96b434d DT |
1266 | return 0; |
1267 | ||
1268 | fail2: remove_proc_entry("devices", proc_bus_input_dir); | |
9c37066d | 1269 | fail1: remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1270 | return -ENOMEM; |
1271 | } | |
1272 | ||
beffbdc2 | 1273 | static void input_proc_exit(void) |
f96b434d DT |
1274 | { |
1275 | remove_proc_entry("devices", proc_bus_input_dir); | |
1276 | remove_proc_entry("handlers", proc_bus_input_dir); | |
9c37066d | 1277 | remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1278 | } |
1279 | ||
1280 | #else /* !CONFIG_PROC_FS */ | |
1281 | static inline void input_wakeup_procfs_readers(void) { } | |
1282 | static inline int input_proc_init(void) { return 0; } | |
1283 | static inline void input_proc_exit(void) { } | |
1284 | #endif | |
1285 | ||
9657d75c DT |
1286 | #define INPUT_DEV_STRING_ATTR_SHOW(name) \ |
1287 | static ssize_t input_dev_show_##name(struct device *dev, \ | |
1288 | struct device_attribute *attr, \ | |
1289 | char *buf) \ | |
1290 | { \ | |
1291 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1292 | \ | |
1293 | return scnprintf(buf, PAGE_SIZE, "%s\n", \ | |
1294 | input_dev->name ? input_dev->name : ""); \ | |
1295 | } \ | |
1296 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL) | |
5c1e9a6a DT |
1297 | |
1298 | INPUT_DEV_STRING_ATTR_SHOW(name); | |
1299 | INPUT_DEV_STRING_ATTR_SHOW(phys); | |
1300 | INPUT_DEV_STRING_ATTR_SHOW(uniq); | |
1301 | ||
ac648a6a DT |
1302 | static int input_print_modalias_bits(char *buf, int size, |
1303 | char name, unsigned long *bm, | |
1304 | unsigned int min_bit, unsigned int max_bit) | |
1d8f430c | 1305 | { |
ac648a6a | 1306 | int len = 0, i; |
1d8f430c | 1307 | |
ac648a6a DT |
1308 | len += snprintf(buf, max(size, 0), "%c", name); |
1309 | for (i = min_bit; i < max_bit; i++) | |
7b19ada2 | 1310 | if (bm[BIT_WORD(i)] & BIT_MASK(i)) |
ac648a6a | 1311 | len += snprintf(buf + len, max(size - len, 0), "%X,", i); |
1d8f430c RR |
1312 | return len; |
1313 | } | |
1314 | ||
2db66876 DT |
1315 | static int input_print_modalias(char *buf, int size, struct input_dev *id, |
1316 | int add_cr) | |
1d8f430c | 1317 | { |
bd37e5a9 | 1318 | int len; |
1d8f430c | 1319 | |
ac648a6a DT |
1320 | len = snprintf(buf, max(size, 0), |
1321 | "input:b%04Xv%04Xp%04Xe%04X-", | |
1322 | id->id.bustype, id->id.vendor, | |
1323 | id->id.product, id->id.version); | |
1324 | ||
1325 | len += input_print_modalias_bits(buf + len, size - len, | |
1326 | 'e', id->evbit, 0, EV_MAX); | |
1327 | len += input_print_modalias_bits(buf + len, size - len, | |
1328 | 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); | |
1329 | len += input_print_modalias_bits(buf + len, size - len, | |
1330 | 'r', id->relbit, 0, REL_MAX); | |
1331 | len += input_print_modalias_bits(buf + len, size - len, | |
1332 | 'a', id->absbit, 0, ABS_MAX); | |
1333 | len += input_print_modalias_bits(buf + len, size - len, | |
1334 | 'm', id->mscbit, 0, MSC_MAX); | |
1335 | len += input_print_modalias_bits(buf + len, size - len, | |
1336 | 'l', id->ledbit, 0, LED_MAX); | |
1337 | len += input_print_modalias_bits(buf + len, size - len, | |
1338 | 's', id->sndbit, 0, SND_MAX); | |
1339 | len += input_print_modalias_bits(buf + len, size - len, | |
1340 | 'f', id->ffbit, 0, FF_MAX); | |
1341 | len += input_print_modalias_bits(buf + len, size - len, | |
1342 | 'w', id->swbit, 0, SW_MAX); | |
2db66876 DT |
1343 | |
1344 | if (add_cr) | |
ac648a6a | 1345 | len += snprintf(buf + len, max(size - len, 0), "\n"); |
2db66876 | 1346 | |
bd37e5a9 KS |
1347 | return len; |
1348 | } | |
1349 | ||
9657d75c DT |
1350 | static ssize_t input_dev_show_modalias(struct device *dev, |
1351 | struct device_attribute *attr, | |
1352 | char *buf) | |
bd37e5a9 KS |
1353 | { |
1354 | struct input_dev *id = to_input_dev(dev); | |
1355 | ssize_t len; | |
1356 | ||
2db66876 DT |
1357 | len = input_print_modalias(buf, PAGE_SIZE, id, 1); |
1358 | ||
8a3cf456 | 1359 | return min_t(int, len, PAGE_SIZE); |
1d8f430c | 1360 | } |
9657d75c | 1361 | static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); |
1d8f430c | 1362 | |
85b77200 HR |
1363 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1364 | int max, int add_cr); | |
1365 | ||
1366 | static ssize_t input_dev_show_properties(struct device *dev, | |
1367 | struct device_attribute *attr, | |
1368 | char *buf) | |
1369 | { | |
1370 | struct input_dev *input_dev = to_input_dev(dev); | |
1371 | int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit, | |
1372 | INPUT_PROP_MAX, true); | |
1373 | return min_t(int, len, PAGE_SIZE); | |
1374 | } | |
1375 | static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL); | |
1376 | ||
629b77a4 | 1377 | static struct attribute *input_dev_attrs[] = { |
9657d75c DT |
1378 | &dev_attr_name.attr, |
1379 | &dev_attr_phys.attr, | |
1380 | &dev_attr_uniq.attr, | |
1381 | &dev_attr_modalias.attr, | |
85b77200 | 1382 | &dev_attr_properties.attr, |
629b77a4 GKH |
1383 | NULL |
1384 | }; | |
1385 | ||
bd0ef235 | 1386 | static struct attribute_group input_dev_attr_group = { |
629b77a4 | 1387 | .attrs = input_dev_attrs, |
5c1e9a6a DT |
1388 | }; |
1389 | ||
9657d75c DT |
1390 | #define INPUT_DEV_ID_ATTR(name) \ |
1391 | static ssize_t input_dev_show_id_##name(struct device *dev, \ | |
1392 | struct device_attribute *attr, \ | |
1393 | char *buf) \ | |
1394 | { \ | |
1395 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1396 | return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \ | |
1397 | } \ | |
1398 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL) | |
5c1e9a6a DT |
1399 | |
1400 | INPUT_DEV_ID_ATTR(bustype); | |
1401 | INPUT_DEV_ID_ATTR(vendor); | |
1402 | INPUT_DEV_ID_ATTR(product); | |
1403 | INPUT_DEV_ID_ATTR(version); | |
1404 | ||
1405 | static struct attribute *input_dev_id_attrs[] = { | |
9657d75c DT |
1406 | &dev_attr_bustype.attr, |
1407 | &dev_attr_vendor.attr, | |
1408 | &dev_attr_product.attr, | |
1409 | &dev_attr_version.attr, | |
5c1e9a6a DT |
1410 | NULL |
1411 | }; | |
1412 | ||
1413 | static struct attribute_group input_dev_id_attr_group = { | |
1414 | .name = "id", | |
1415 | .attrs = input_dev_id_attrs, | |
1416 | }; | |
1417 | ||
969b21cd DT |
1418 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1419 | int max, int add_cr) | |
1420 | { | |
1421 | int i; | |
1422 | int len = 0; | |
15e184af DT |
1423 | bool skip_empty = true; |
1424 | ||
1425 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
1426 | len += input_bits_to_string(buf + len, max(buf_size - len, 0), | |
1427 | bitmap[i], skip_empty); | |
1428 | if (len) { | |
1429 | skip_empty = false; | |
1430 | if (i > 0) | |
1431 | len += snprintf(buf + len, max(buf_size - len, 0), " "); | |
1432 | } | |
1433 | } | |
969b21cd | 1434 | |
15e184af DT |
1435 | /* |
1436 | * If no output was produced print a single 0. | |
1437 | */ | |
1438 | if (len == 0) | |
1439 | len = snprintf(buf, buf_size, "%d", 0); | |
969b21cd DT |
1440 | |
1441 | if (add_cr) | |
1442 | len += snprintf(buf + len, max(buf_size - len, 0), "\n"); | |
1443 | ||
1444 | return len; | |
1445 | } | |
1446 | ||
9657d75c DT |
1447 | #define INPUT_DEV_CAP_ATTR(ev, bm) \ |
1448 | static ssize_t input_dev_show_cap_##bm(struct device *dev, \ | |
1449 | struct device_attribute *attr, \ | |
1450 | char *buf) \ | |
1451 | { \ | |
1452 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1453 | int len = input_print_bitmap(buf, PAGE_SIZE, \ | |
15e184af DT |
1454 | input_dev->bm##bit, ev##_MAX, \ |
1455 | true); \ | |
9657d75c DT |
1456 | return min_t(int, len, PAGE_SIZE); \ |
1457 | } \ | |
1458 | static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL) | |
5c1e9a6a DT |
1459 | |
1460 | INPUT_DEV_CAP_ATTR(EV, ev); | |
1461 | INPUT_DEV_CAP_ATTR(KEY, key); | |
1462 | INPUT_DEV_CAP_ATTR(REL, rel); | |
1463 | INPUT_DEV_CAP_ATTR(ABS, abs); | |
1464 | INPUT_DEV_CAP_ATTR(MSC, msc); | |
1465 | INPUT_DEV_CAP_ATTR(LED, led); | |
1466 | INPUT_DEV_CAP_ATTR(SND, snd); | |
1467 | INPUT_DEV_CAP_ATTR(FF, ff); | |
1468 | INPUT_DEV_CAP_ATTR(SW, sw); | |
1469 | ||
1470 | static struct attribute *input_dev_caps_attrs[] = { | |
9657d75c DT |
1471 | &dev_attr_ev.attr, |
1472 | &dev_attr_key.attr, | |
1473 | &dev_attr_rel.attr, | |
1474 | &dev_attr_abs.attr, | |
1475 | &dev_attr_msc.attr, | |
1476 | &dev_attr_led.attr, | |
1477 | &dev_attr_snd.attr, | |
1478 | &dev_attr_ff.attr, | |
1479 | &dev_attr_sw.attr, | |
5c1e9a6a DT |
1480 | NULL |
1481 | }; | |
1482 | ||
1483 | static struct attribute_group input_dev_caps_attr_group = { | |
1484 | .name = "capabilities", | |
1485 | .attrs = input_dev_caps_attrs, | |
1486 | }; | |
1487 | ||
a4dbd674 | 1488 | static const struct attribute_group *input_dev_attr_groups[] = { |
cb9def4d DT |
1489 | &input_dev_attr_group, |
1490 | &input_dev_id_attr_group, | |
1491 | &input_dev_caps_attr_group, | |
1492 | NULL | |
1493 | }; | |
1494 | ||
9657d75c | 1495 | static void input_dev_release(struct device *device) |
d19fbe8a | 1496 | { |
9657d75c | 1497 | struct input_dev *dev = to_input_dev(device); |
d19fbe8a | 1498 | |
509ca1a9 | 1499 | input_ff_destroy(dev); |
40d007e7 | 1500 | input_mt_destroy_slots(dev); |
d31b2865 | 1501 | kfree(dev->absinfo); |
4369c64c | 1502 | kfree(dev->vals); |
d19fbe8a | 1503 | kfree(dev); |
509ca1a9 | 1504 | |
d19fbe8a DT |
1505 | module_put(THIS_MODULE); |
1506 | } | |
1507 | ||
a7fadbe1 | 1508 | /* |
312c004d | 1509 | * Input uevent interface - loading event handlers based on |
a7fadbe1 DT |
1510 | * device bitfields. |
1511 | */ | |
7eff2e7a | 1512 | static int input_add_uevent_bm_var(struct kobj_uevent_env *env, |
ac648a6a | 1513 | const char *name, unsigned long *bitmap, int max) |
a7fadbe1 | 1514 | { |
7eff2e7a | 1515 | int len; |
a7fadbe1 | 1516 | |
fcd3027a | 1517 | if (add_uevent_var(env, "%s", name)) |
a7fadbe1 DT |
1518 | return -ENOMEM; |
1519 | ||
7eff2e7a KS |
1520 | len = input_print_bitmap(&env->buf[env->buflen - 1], |
1521 | sizeof(env->buf) - env->buflen, | |
15e184af | 1522 | bitmap, max, false); |
7eff2e7a | 1523 | if (len >= (sizeof(env->buf) - env->buflen)) |
a7fadbe1 DT |
1524 | return -ENOMEM; |
1525 | ||
7eff2e7a | 1526 | env->buflen += len; |
a7fadbe1 DT |
1527 | return 0; |
1528 | } | |
1529 | ||
7eff2e7a | 1530 | static int input_add_uevent_modalias_var(struct kobj_uevent_env *env, |
ac648a6a DT |
1531 | struct input_dev *dev) |
1532 | { | |
7eff2e7a | 1533 | int len; |
ac648a6a | 1534 | |
7eff2e7a | 1535 | if (add_uevent_var(env, "MODALIAS=")) |
ac648a6a DT |
1536 | return -ENOMEM; |
1537 | ||
7eff2e7a KS |
1538 | len = input_print_modalias(&env->buf[env->buflen - 1], |
1539 | sizeof(env->buf) - env->buflen, | |
1540 | dev, 0); | |
1541 | if (len >= (sizeof(env->buf) - env->buflen)) | |
ac648a6a DT |
1542 | return -ENOMEM; |
1543 | ||
7eff2e7a | 1544 | env->buflen += len; |
ac648a6a DT |
1545 | return 0; |
1546 | } | |
1547 | ||
a7fadbe1 DT |
1548 | #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \ |
1549 | do { \ | |
7eff2e7a | 1550 | int err = add_uevent_var(env, fmt, val); \ |
a7fadbe1 DT |
1551 | if (err) \ |
1552 | return err; \ | |
1553 | } while (0) | |
1554 | ||
1555 | #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \ | |
1556 | do { \ | |
7eff2e7a | 1557 | int err = input_add_uevent_bm_var(env, name, bm, max); \ |
a7fadbe1 DT |
1558 | if (err) \ |
1559 | return err; \ | |
1560 | } while (0) | |
1561 | ||
ac648a6a DT |
1562 | #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \ |
1563 | do { \ | |
7eff2e7a | 1564 | int err = input_add_uevent_modalias_var(env, dev); \ |
ac648a6a DT |
1565 | if (err) \ |
1566 | return err; \ | |
1567 | } while (0) | |
1568 | ||
7eff2e7a | 1569 | static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env) |
a7fadbe1 | 1570 | { |
9657d75c | 1571 | struct input_dev *dev = to_input_dev(device); |
a7fadbe1 DT |
1572 | |
1573 | INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x", | |
1574 | dev->id.bustype, dev->id.vendor, | |
1575 | dev->id.product, dev->id.version); | |
1576 | if (dev->name) | |
1577 | INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); | |
1578 | if (dev->phys) | |
1579 | INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); | |
08de1f04 | 1580 | if (dev->uniq) |
a7fadbe1 DT |
1581 | INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); |
1582 | ||
85b77200 HR |
1583 | INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX); |
1584 | ||
a7fadbe1 DT |
1585 | INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX); |
1586 | if (test_bit(EV_KEY, dev->evbit)) | |
1587 | INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX); | |
1588 | if (test_bit(EV_REL, dev->evbit)) | |
1589 | INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX); | |
1590 | if (test_bit(EV_ABS, dev->evbit)) | |
1591 | INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX); | |
1592 | if (test_bit(EV_MSC, dev->evbit)) | |
1593 | INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX); | |
1594 | if (test_bit(EV_LED, dev->evbit)) | |
1595 | INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX); | |
1596 | if (test_bit(EV_SND, dev->evbit)) | |
1597 | INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX); | |
1598 | if (test_bit(EV_FF, dev->evbit)) | |
1599 | INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX); | |
1600 | if (test_bit(EV_SW, dev->evbit)) | |
1601 | INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); | |
1602 | ||
ac648a6a | 1603 | INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); |
a7fadbe1 DT |
1604 | |
1605 | return 0; | |
1606 | } | |
1607 | ||
3cc96351 DT |
1608 | #define INPUT_DO_TOGGLE(dev, type, bits, on) \ |
1609 | do { \ | |
1610 | int i; \ | |
1611 | bool active; \ | |
1612 | \ | |
1613 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1614 | break; \ | |
1615 | \ | |
1616 | for (i = 0; i < type##_MAX; i++) { \ | |
1617 | if (!test_bit(i, dev->bits##bit)) \ | |
1618 | continue; \ | |
1619 | \ | |
1620 | active = test_bit(i, dev->bits); \ | |
1621 | if (!active && !on) \ | |
1622 | continue; \ | |
1623 | \ | |
1624 | dev->event(dev, EV_##type, i, on ? active : 0); \ | |
1625 | } \ | |
ffd0db97 DT |
1626 | } while (0) |
1627 | ||
b50b5216 | 1628 | static void input_dev_toggle(struct input_dev *dev, bool activate) |
ffd0db97 DT |
1629 | { |
1630 | if (!dev->event) | |
1631 | return; | |
1632 | ||
1633 | INPUT_DO_TOGGLE(dev, LED, led, activate); | |
1634 | INPUT_DO_TOGGLE(dev, SND, snd, activate); | |
1635 | ||
1636 | if (activate && test_bit(EV_REP, dev->evbit)) { | |
1637 | dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]); | |
1638 | dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]); | |
1639 | } | |
1640 | } | |
1641 | ||
b50b5216 DT |
1642 | /** |
1643 | * input_reset_device() - reset/restore the state of input device | |
1644 | * @dev: input device whose state needs to be reset | |
1645 | * | |
1646 | * This function tries to reset the state of an opened input device and | |
1647 | * bring internal state and state if the hardware in sync with each other. | |
1648 | * We mark all keys as released, restore LED state, repeat rate, etc. | |
1649 | */ | |
1650 | void input_reset_device(struct input_dev *dev) | |
1651 | { | |
1652 | mutex_lock(&dev->mutex); | |
1653 | ||
1654 | if (dev->users) { | |
1655 | input_dev_toggle(dev, true); | |
1656 | ||
1657 | /* | |
1658 | * Keys that have been pressed at suspend time are unlikely | |
1659 | * to be still pressed when we resume. | |
1660 | */ | |
1661 | spin_lock_irq(&dev->event_lock); | |
1662 | input_dev_release_keys(dev); | |
1663 | spin_unlock_irq(&dev->event_lock); | |
1664 | } | |
1665 | ||
1666 | mutex_unlock(&dev->mutex); | |
1667 | } | |
1668 | EXPORT_SYMBOL(input_reset_device); | |
1669 | ||
1670 | #ifdef CONFIG_PM | |
ffd0db97 DT |
1671 | static int input_dev_suspend(struct device *dev) |
1672 | { | |
1673 | struct input_dev *input_dev = to_input_dev(dev); | |
1674 | ||
1675 | mutex_lock(&input_dev->mutex); | |
b50b5216 DT |
1676 | |
1677 | if (input_dev->users) | |
1678 | input_dev_toggle(input_dev, false); | |
1679 | ||
ffd0db97 DT |
1680 | mutex_unlock(&input_dev->mutex); |
1681 | ||
1682 | return 0; | |
1683 | } | |
1684 | ||
1685 | static int input_dev_resume(struct device *dev) | |
1686 | { | |
1687 | struct input_dev *input_dev = to_input_dev(dev); | |
1688 | ||
b50b5216 | 1689 | input_reset_device(input_dev); |
ffd0db97 DT |
1690 | |
1691 | return 0; | |
1692 | } | |
1693 | ||
1694 | static const struct dev_pm_ops input_dev_pm_ops = { | |
1695 | .suspend = input_dev_suspend, | |
1696 | .resume = input_dev_resume, | |
1697 | .poweroff = input_dev_suspend, | |
1698 | .restore = input_dev_resume, | |
1699 | }; | |
1700 | #endif /* CONFIG_PM */ | |
1701 | ||
9657d75c DT |
1702 | static struct device_type input_dev_type = { |
1703 | .groups = input_dev_attr_groups, | |
1704 | .release = input_dev_release, | |
1705 | .uevent = input_dev_uevent, | |
ffd0db97 DT |
1706 | #ifdef CONFIG_PM |
1707 | .pm = &input_dev_pm_ops, | |
1708 | #endif | |
9657d75c DT |
1709 | }; |
1710 | ||
2c9ede55 | 1711 | static char *input_devnode(struct device *dev, umode_t *mode) |
aa5ed63e KS |
1712 | { |
1713 | return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev)); | |
1714 | } | |
1715 | ||
ea9f240b | 1716 | struct class input_class = { |
9657d75c | 1717 | .name = "input", |
e454cea2 | 1718 | .devnode = input_devnode, |
d19fbe8a | 1719 | }; |
ca56fe07 | 1720 | EXPORT_SYMBOL_GPL(input_class); |
d19fbe8a | 1721 | |
1447190e DT |
1722 | /** |
1723 | * input_allocate_device - allocate memory for new input device | |
1724 | * | |
1725 | * Returns prepared struct input_dev or NULL. | |
1726 | * | |
1727 | * NOTE: Use input_free_device() to free devices that have not been | |
1728 | * registered; input_unregister_device() should be used for already | |
1729 | * registered devices. | |
1730 | */ | |
d19fbe8a DT |
1731 | struct input_dev *input_allocate_device(void) |
1732 | { | |
1733 | struct input_dev *dev; | |
1734 | ||
1735 | dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); | |
1736 | if (dev) { | |
9657d75c DT |
1737 | dev->dev.type = &input_dev_type; |
1738 | dev->dev.class = &input_class; | |
1739 | device_initialize(&dev->dev); | |
f60d2b11 | 1740 | mutex_init(&dev->mutex); |
8006479c | 1741 | spin_lock_init(&dev->event_lock); |
d19fbe8a DT |
1742 | INIT_LIST_HEAD(&dev->h_list); |
1743 | INIT_LIST_HEAD(&dev->node); | |
655816e4 DT |
1744 | |
1745 | __module_get(THIS_MODULE); | |
d19fbe8a DT |
1746 | } |
1747 | ||
1748 | return dev; | |
1749 | } | |
ca56fe07 | 1750 | EXPORT_SYMBOL(input_allocate_device); |
d19fbe8a | 1751 | |
1447190e DT |
1752 | /** |
1753 | * input_free_device - free memory occupied by input_dev structure | |
1754 | * @dev: input device to free | |
1755 | * | |
1756 | * This function should only be used if input_register_device() | |
1757 | * was not called yet or if it failed. Once device was registered | |
1758 | * use input_unregister_device() and memory will be freed once last | |
8006479c | 1759 | * reference to the device is dropped. |
1447190e DT |
1760 | * |
1761 | * Device should be allocated by input_allocate_device(). | |
1762 | * | |
1763 | * NOTE: If there are references to the input device then memory | |
1764 | * will not be freed until last reference is dropped. | |
1765 | */ | |
f60d2b11 DT |
1766 | void input_free_device(struct input_dev *dev) |
1767 | { | |
54f9e36c | 1768 | if (dev) |
f60d2b11 | 1769 | input_put_device(dev); |
f60d2b11 | 1770 | } |
ca56fe07 | 1771 | EXPORT_SYMBOL(input_free_device); |
f60d2b11 | 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 | 1821 | default: |
da0c4901 JP |
1822 | pr_err("input_set_capability: unknown type %u (code %u)\n", |
1823 | type, code); | |
534565f2 DT |
1824 | dump_stack(); |
1825 | return; | |
1826 | } | |
1827 | ||
1828 | __set_bit(type, dev->evbit); | |
1829 | } | |
1830 | EXPORT_SYMBOL(input_set_capability); | |
1831 | ||
80b4895a JB |
1832 | static unsigned int input_estimate_events_per_packet(struct input_dev *dev) |
1833 | { | |
1834 | int mt_slots; | |
1835 | int i; | |
1836 | unsigned int events; | |
1837 | ||
8d18fba2 HR |
1838 | if (dev->mt) { |
1839 | mt_slots = dev->mt->num_slots; | |
80b4895a JB |
1840 | } else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit)) { |
1841 | mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum - | |
1842 | dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1, | |
8c127f07 | 1843 | mt_slots = clamp(mt_slots, 2, 32); |
80b4895a JB |
1844 | } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) { |
1845 | mt_slots = 2; | |
1846 | } else { | |
1847 | mt_slots = 0; | |
1848 | } | |
1849 | ||
1850 | events = mt_slots + 1; /* count SYN_MT_REPORT and SYN_REPORT */ | |
1851 | ||
1852 | for (i = 0; i < ABS_CNT; i++) { | |
1853 | if (test_bit(i, dev->absbit)) { | |
1854 | if (input_is_mt_axis(i)) | |
1855 | events += mt_slots; | |
1856 | else | |
1857 | events++; | |
1858 | } | |
1859 | } | |
1860 | ||
1861 | for (i = 0; i < REL_CNT; i++) | |
1862 | if (test_bit(i, dev->relbit)) | |
1863 | events++; | |
1864 | ||
7c75bf99 HR |
1865 | /* Make room for KEY and MSC events */ |
1866 | events += 7; | |
1867 | ||
80b4895a JB |
1868 | return events; |
1869 | } | |
1870 | ||
92a3a587 DT |
1871 | #define INPUT_CLEANSE_BITMASK(dev, type, bits) \ |
1872 | do { \ | |
1873 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1874 | memset(dev->bits##bit, 0, \ | |
1875 | sizeof(dev->bits##bit)); \ | |
1876 | } while (0) | |
1877 | ||
1878 | static void input_cleanse_bitmasks(struct input_dev *dev) | |
1879 | { | |
1880 | INPUT_CLEANSE_BITMASK(dev, KEY, key); | |
1881 | INPUT_CLEANSE_BITMASK(dev, REL, rel); | |
1882 | INPUT_CLEANSE_BITMASK(dev, ABS, abs); | |
1883 | INPUT_CLEANSE_BITMASK(dev, MSC, msc); | |
1884 | INPUT_CLEANSE_BITMASK(dev, LED, led); | |
1885 | INPUT_CLEANSE_BITMASK(dev, SND, snd); | |
1886 | INPUT_CLEANSE_BITMASK(dev, FF, ff); | |
1887 | INPUT_CLEANSE_BITMASK(dev, SW, sw); | |
1888 | } | |
1889 | ||
8006479c DT |
1890 | /** |
1891 | * input_register_device - register device with input core | |
1892 | * @dev: device to be registered | |
1893 | * | |
1894 | * This function registers device with input core. The device must be | |
1895 | * allocated with input_allocate_device() and all it's capabilities | |
1896 | * set up before registering. | |
1897 | * If function fails the device must be freed with input_free_device(). | |
1898 | * Once device has been successfully registered it can be unregistered | |
1899 | * with input_unregister_device(); input_free_device() should not be | |
1900 | * called in this case. | |
1901 | */ | |
5f945489 | 1902 | int input_register_device(struct input_dev *dev) |
1da177e4 | 1903 | { |
bd0ef235 | 1904 | static atomic_t input_no = ATOMIC_INIT(0); |
1da177e4 | 1905 | struct input_handler *handler; |
7c75bf99 | 1906 | unsigned int packet_size; |
bd0ef235 DT |
1907 | const char *path; |
1908 | int error; | |
1da177e4 | 1909 | |
4f93df40 | 1910 | /* Every input device generates EV_SYN/SYN_REPORT events. */ |
8006479c | 1911 | __set_bit(EV_SYN, dev->evbit); |
0fbf87ca | 1912 | |
4f93df40 DT |
1913 | /* KEY_RESERVED is not supposed to be transmitted to userspace. */ |
1914 | __clear_bit(KEY_RESERVED, dev->keybit); | |
1915 | ||
92a3a587 DT |
1916 | /* Make sure that bitmasks not mentioned in dev->evbit are clean. */ |
1917 | input_cleanse_bitmasks(dev); | |
1918 | ||
7c75bf99 HR |
1919 | packet_size = input_estimate_events_per_packet(dev); |
1920 | if (dev->hint_events_per_packet < packet_size) | |
1921 | dev->hint_events_per_packet = packet_size; | |
80b4895a | 1922 | |
4369c64c HR |
1923 | dev->max_vals = max(dev->hint_events_per_packet, packet_size) + 2; |
1924 | dev->vals = kcalloc(dev->max_vals, sizeof(*dev->vals), GFP_KERNEL); | |
1925 | if (!dev->vals) | |
1926 | return -ENOMEM; | |
80b4895a | 1927 | |
1da177e4 LT |
1928 | /* |
1929 | * If delay and period are pre-set by the driver, then autorepeating | |
1930 | * is handled by the driver itself and we don't do it in input.c. | |
1931 | */ | |
1da177e4 LT |
1932 | init_timer(&dev->timer); |
1933 | if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { | |
1934 | dev->timer.data = (long) dev; | |
1935 | dev->timer.function = input_repeat_key; | |
1936 | dev->rep[REP_DELAY] = 250; | |
1937 | dev->rep[REP_PERIOD] = 33; | |
1938 | } | |
1939 | ||
aebd636b DT |
1940 | if (!dev->getkeycode) |
1941 | dev->getkeycode = input_default_getkeycode; | |
c8e4c772 | 1942 | |
aebd636b DT |
1943 | if (!dev->setkeycode) |
1944 | dev->setkeycode = input_default_setkeycode; | |
c8e4c772 | 1945 | |
a6c2490f KS |
1946 | dev_set_name(&dev->dev, "input%ld", |
1947 | (unsigned long) atomic_inc_return(&input_no) - 1); | |
bd0ef235 | 1948 | |
9657d75c | 1949 | error = device_add(&dev->dev); |
bd0ef235 DT |
1950 | if (error) |
1951 | return error; | |
1952 | ||
9657d75c | 1953 | path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
da0c4901 JP |
1954 | pr_info("%s as %s\n", |
1955 | dev->name ? dev->name : "Unspecified device", | |
1956 | path ? path : "N/A"); | |
bd0ef235 | 1957 | kfree(path); |
10204020 | 1958 | |
8006479c DT |
1959 | error = mutex_lock_interruptible(&input_mutex); |
1960 | if (error) { | |
1961 | device_del(&dev->dev); | |
1962 | return error; | |
1963 | } | |
1964 | ||
1965 | list_add_tail(&dev->node, &input_dev_list); | |
1966 | ||
1da177e4 | 1967 | list_for_each_entry(handler, &input_handler_list, node) |
5b2a0826 | 1968 | input_attach_handler(dev, handler); |
1da177e4 | 1969 | |
f96b434d | 1970 | input_wakeup_procfs_readers(); |
5f945489 | 1971 | |
8006479c DT |
1972 | mutex_unlock(&input_mutex); |
1973 | ||
5f945489 | 1974 | return 0; |
1da177e4 | 1975 | } |
ca56fe07 | 1976 | EXPORT_SYMBOL(input_register_device); |
1da177e4 | 1977 | |
8006479c DT |
1978 | /** |
1979 | * input_unregister_device - unregister previously registered device | |
1980 | * @dev: device to be unregistered | |
1981 | * | |
1982 | * This function unregisters an input device. Once device is unregistered | |
1983 | * the caller should not try to access it as it may get freed at any moment. | |
1984 | */ | |
1da177e4 LT |
1985 | void input_unregister_device(struct input_dev *dev) |
1986 | { | |
5b2a0826 | 1987 | struct input_handle *handle, *next; |
1da177e4 | 1988 | |
8006479c | 1989 | input_disconnect_device(dev); |
1da177e4 | 1990 | |
8006479c | 1991 | mutex_lock(&input_mutex); |
1da177e4 | 1992 | |
5b2a0826 | 1993 | list_for_each_entry_safe(handle, next, &dev->h_list, d_node) |
1da177e4 | 1994 | handle->handler->disconnect(handle); |
5b2a0826 | 1995 | WARN_ON(!list_empty(&dev->h_list)); |
1da177e4 | 1996 | |
8006479c | 1997 | del_timer_sync(&dev->timer); |
1da177e4 LT |
1998 | list_del_init(&dev->node); |
1999 | ||
f96b434d | 2000 | input_wakeup_procfs_readers(); |
8006479c DT |
2001 | |
2002 | mutex_unlock(&input_mutex); | |
2003 | ||
2004 | device_unregister(&dev->dev); | |
1da177e4 | 2005 | } |
ca56fe07 | 2006 | EXPORT_SYMBOL(input_unregister_device); |
1da177e4 | 2007 | |
8006479c DT |
2008 | /** |
2009 | * input_register_handler - register a new input handler | |
2010 | * @handler: handler to be registered | |
2011 | * | |
2012 | * This function registers a new input handler (interface) for input | |
2013 | * devices in the system and attaches it to all input devices that | |
2014 | * are compatible with the handler. | |
2015 | */ | |
4263cf0f | 2016 | int input_register_handler(struct input_handler *handler) |
1da177e4 LT |
2017 | { |
2018 | struct input_dev *dev; | |
8006479c DT |
2019 | int retval; |
2020 | ||
2021 | retval = mutex_lock_interruptible(&input_mutex); | |
2022 | if (retval) | |
2023 | return retval; | |
1da177e4 | 2024 | |
1da177e4 LT |
2025 | INIT_LIST_HEAD(&handler->h_list); |
2026 | ||
4263cf0f | 2027 | if (handler->fops != NULL) { |
8006479c DT |
2028 | if (input_table[handler->minor >> 5]) { |
2029 | retval = -EBUSY; | |
2030 | goto out; | |
2031 | } | |
1da177e4 | 2032 | input_table[handler->minor >> 5] = handler; |
4263cf0f | 2033 | } |
1da177e4 LT |
2034 | |
2035 | list_add_tail(&handler->node, &input_handler_list); | |
2036 | ||
2037 | list_for_each_entry(dev, &input_dev_list, node) | |
5b2a0826 | 2038 | input_attach_handler(dev, handler); |
1da177e4 | 2039 | |
f96b434d | 2040 | input_wakeup_procfs_readers(); |
8006479c DT |
2041 | |
2042 | out: | |
2043 | mutex_unlock(&input_mutex); | |
2044 | return retval; | |
1da177e4 | 2045 | } |
ca56fe07 | 2046 | EXPORT_SYMBOL(input_register_handler); |
1da177e4 | 2047 | |
8006479c DT |
2048 | /** |
2049 | * input_unregister_handler - unregisters an input handler | |
2050 | * @handler: handler to be unregistered | |
2051 | * | |
2052 | * This function disconnects a handler from its input devices and | |
2053 | * removes it from lists of known handlers. | |
2054 | */ | |
1da177e4 LT |
2055 | void input_unregister_handler(struct input_handler *handler) |
2056 | { | |
5b2a0826 | 2057 | struct input_handle *handle, *next; |
1da177e4 | 2058 | |
8006479c DT |
2059 | mutex_lock(&input_mutex); |
2060 | ||
5b2a0826 | 2061 | list_for_each_entry_safe(handle, next, &handler->h_list, h_node) |
1da177e4 | 2062 | handler->disconnect(handle); |
5b2a0826 | 2063 | WARN_ON(!list_empty(&handler->h_list)); |
1da177e4 LT |
2064 | |
2065 | list_del_init(&handler->node); | |
2066 | ||
2067 | if (handler->fops != NULL) | |
2068 | input_table[handler->minor >> 5] = NULL; | |
2069 | ||
f96b434d | 2070 | input_wakeup_procfs_readers(); |
8006479c DT |
2071 | |
2072 | mutex_unlock(&input_mutex); | |
1da177e4 | 2073 | } |
ca56fe07 | 2074 | EXPORT_SYMBOL(input_unregister_handler); |
1da177e4 | 2075 | |
66d2a595 DT |
2076 | /** |
2077 | * input_handler_for_each_handle - handle iterator | |
2078 | * @handler: input handler to iterate | |
2079 | * @data: data for the callback | |
2080 | * @fn: function to be called for each handle | |
2081 | * | |
2082 | * Iterate over @bus's list of devices, and call @fn for each, passing | |
2083 | * it @data and stop when @fn returns a non-zero value. The function is | |
2084 | * using RCU to traverse the list and therefore may be usind in atonic | |
2085 | * contexts. The @fn callback is invoked from RCU critical section and | |
2086 | * thus must not sleep. | |
2087 | */ | |
2088 | int input_handler_for_each_handle(struct input_handler *handler, void *data, | |
2089 | int (*fn)(struct input_handle *, void *)) | |
2090 | { | |
2091 | struct input_handle *handle; | |
2092 | int retval = 0; | |
2093 | ||
2094 | rcu_read_lock(); | |
2095 | ||
2096 | list_for_each_entry_rcu(handle, &handler->h_list, h_node) { | |
2097 | retval = fn(handle, data); | |
2098 | if (retval) | |
2099 | break; | |
2100 | } | |
2101 | ||
2102 | rcu_read_unlock(); | |
2103 | ||
2104 | return retval; | |
2105 | } | |
2106 | EXPORT_SYMBOL(input_handler_for_each_handle); | |
2107 | ||
8006479c DT |
2108 | /** |
2109 | * input_register_handle - register a new input handle | |
2110 | * @handle: handle to register | |
2111 | * | |
2112 | * This function puts a new input handle onto device's | |
2113 | * and handler's lists so that events can flow through | |
2114 | * it once it is opened using input_open_device(). | |
2115 | * | |
2116 | * This function is supposed to be called from handler's | |
2117 | * connect() method. | |
2118 | */ | |
5b2a0826 DT |
2119 | int input_register_handle(struct input_handle *handle) |
2120 | { | |
2121 | struct input_handler *handler = handle->handler; | |
8006479c DT |
2122 | struct input_dev *dev = handle->dev; |
2123 | int error; | |
2124 | ||
2125 | /* | |
2126 | * We take dev->mutex here to prevent race with | |
2127 | * input_release_device(). | |
2128 | */ | |
2129 | error = mutex_lock_interruptible(&dev->mutex); | |
2130 | if (error) | |
2131 | return error; | |
ef7995f4 DT |
2132 | |
2133 | /* | |
2134 | * Filters go to the head of the list, normal handlers | |
2135 | * to the tail. | |
2136 | */ | |
2137 | if (handler->filter) | |
2138 | list_add_rcu(&handle->d_node, &dev->h_list); | |
2139 | else | |
2140 | list_add_tail_rcu(&handle->d_node, &dev->h_list); | |
2141 | ||
8006479c | 2142 | mutex_unlock(&dev->mutex); |
5b2a0826 | 2143 | |
8006479c DT |
2144 | /* |
2145 | * Since we are supposed to be called from ->connect() | |
2146 | * which is mutually exclusive with ->disconnect() | |
2147 | * we can't be racing with input_unregister_handle() | |
2148 | * and so separate lock is not needed here. | |
2149 | */ | |
66d2a595 | 2150 | list_add_tail_rcu(&handle->h_node, &handler->h_list); |
5b2a0826 DT |
2151 | |
2152 | if (handler->start) | |
2153 | handler->start(handle); | |
2154 | ||
2155 | return 0; | |
2156 | } | |
2157 | EXPORT_SYMBOL(input_register_handle); | |
2158 | ||
8006479c DT |
2159 | /** |
2160 | * input_unregister_handle - unregister an input handle | |
2161 | * @handle: handle to unregister | |
2162 | * | |
2163 | * This function removes input handle from device's | |
2164 | * and handler's lists. | |
2165 | * | |
2166 | * This function is supposed to be called from handler's | |
2167 | * disconnect() method. | |
2168 | */ | |
5b2a0826 DT |
2169 | void input_unregister_handle(struct input_handle *handle) |
2170 | { | |
8006479c DT |
2171 | struct input_dev *dev = handle->dev; |
2172 | ||
66d2a595 | 2173 | list_del_rcu(&handle->h_node); |
8006479c DT |
2174 | |
2175 | /* | |
2176 | * Take dev->mutex to prevent race with input_release_device(). | |
2177 | */ | |
2178 | mutex_lock(&dev->mutex); | |
2179 | list_del_rcu(&handle->d_node); | |
2180 | mutex_unlock(&dev->mutex); | |
66d2a595 | 2181 | |
82ba56c2 | 2182 | synchronize_rcu(); |
5b2a0826 DT |
2183 | } |
2184 | EXPORT_SYMBOL(input_unregister_handle); | |
2185 | ||
1da177e4 LT |
2186 | static int input_open_file(struct inode *inode, struct file *file) |
2187 | { | |
2edbf853 | 2188 | struct input_handler *handler; |
99ac48f5 | 2189 | const struct file_operations *old_fops, *new_fops = NULL; |
1da177e4 LT |
2190 | int err; |
2191 | ||
2f2177c8 AB |
2192 | err = mutex_lock_interruptible(&input_mutex); |
2193 | if (err) | |
2194 | return err; | |
2195 | ||
1da177e4 | 2196 | /* No load-on-demand here? */ |
2edbf853 | 2197 | handler = input_table[iminor(inode) >> 5]; |
2f2177c8 AB |
2198 | if (handler) |
2199 | new_fops = fops_get(handler->fops); | |
2200 | ||
2201 | mutex_unlock(&input_mutex); | |
1da177e4 LT |
2202 | |
2203 | /* | |
2204 | * That's _really_ odd. Usually NULL ->open means "nothing special", | |
2205 | * not "no device". Oh, well... | |
2206 | */ | |
2f2177c8 | 2207 | if (!new_fops || !new_fops->open) { |
1da177e4 | 2208 | fops_put(new_fops); |
2edbf853 JC |
2209 | err = -ENODEV; |
2210 | goto out; | |
1da177e4 | 2211 | } |
2f2177c8 | 2212 | |
1da177e4 LT |
2213 | old_fops = file->f_op; |
2214 | file->f_op = new_fops; | |
2215 | ||
2216 | err = new_fops->open(inode, file); | |
1da177e4 LT |
2217 | if (err) { |
2218 | fops_put(file->f_op); | |
2219 | file->f_op = fops_get(old_fops); | |
2220 | } | |
2221 | fops_put(old_fops); | |
2edbf853 | 2222 | out: |
1da177e4 LT |
2223 | return err; |
2224 | } | |
2225 | ||
2b8693c0 | 2226 | static const struct file_operations input_fops = { |
1da177e4 LT |
2227 | .owner = THIS_MODULE, |
2228 | .open = input_open_file, | |
6038f373 | 2229 | .llseek = noop_llseek, |
1da177e4 LT |
2230 | }; |
2231 | ||
f96b434d | 2232 | static int __init input_init(void) |
1da177e4 | 2233 | { |
f96b434d | 2234 | int err; |
1da177e4 | 2235 | |
ea9f240b | 2236 | err = class_register(&input_class); |
d19fbe8a | 2237 | if (err) { |
da0c4901 | 2238 | pr_err("unable to register input_dev class\n"); |
d19fbe8a DT |
2239 | return err; |
2240 | } | |
2241 | ||
f96b434d DT |
2242 | err = input_proc_init(); |
2243 | if (err) | |
b0fdfebb | 2244 | goto fail1; |
1da177e4 | 2245 | |
f96b434d DT |
2246 | err = register_chrdev(INPUT_MAJOR, "input", &input_fops); |
2247 | if (err) { | |
da0c4901 | 2248 | pr_err("unable to register char major %d", INPUT_MAJOR); |
b0fdfebb | 2249 | goto fail2; |
1da177e4 | 2250 | } |
e334016f | 2251 | |
1da177e4 | 2252 | return 0; |
1da177e4 | 2253 | |
b0fdfebb | 2254 | fail2: input_proc_exit(); |
ea9f240b | 2255 | fail1: class_unregister(&input_class); |
f96b434d | 2256 | return err; |
1da177e4 LT |
2257 | } |
2258 | ||
2259 | static void __exit input_exit(void) | |
2260 | { | |
f96b434d | 2261 | input_proc_exit(); |
1da177e4 | 2262 | unregister_chrdev(INPUT_MAJOR, "input"); |
ea9f240b | 2263 | class_unregister(&input_class); |
1da177e4 LT |
2264 | } |
2265 | ||
2266 | subsys_initcall(input_init); | |
2267 | module_exit(input_exit); |