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> |
7f8d4cad | 17 | #include <linux/idr.h> |
47c78e89 | 18 | #include <linux/input/mt.h> |
1da177e4 | 19 | #include <linux/module.h> |
5a0e3ad6 | 20 | #include <linux/slab.h> |
1da177e4 LT |
21 | #include <linux/random.h> |
22 | #include <linux/major.h> | |
23 | #include <linux/proc_fs.h> | |
a99bbaf5 | 24 | #include <linux/sched.h> |
969b21cd | 25 | #include <linux/seq_file.h> |
1da177e4 LT |
26 | #include <linux/poll.h> |
27 | #include <linux/device.h> | |
e676c232 | 28 | #include <linux/mutex.h> |
8006479c | 29 | #include <linux/rcupdate.h> |
15e184af | 30 | #include "input-compat.h" |
1da177e4 LT |
31 | |
32 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>"); | |
33 | MODULE_DESCRIPTION("Input core"); | |
34 | MODULE_LICENSE("GPL"); | |
35 | ||
7f8d4cad DT |
36 | #define INPUT_MAX_CHAR_DEVICES 1024 |
37 | #define INPUT_FIRST_DYNAMIC_DEV 256 | |
38 | static DEFINE_IDA(input_ida); | |
1da177e4 LT |
39 | |
40 | static LIST_HEAD(input_dev_list); | |
41 | static LIST_HEAD(input_handler_list); | |
42 | ||
8006479c DT |
43 | /* |
44 | * input_mutex protects access to both input_dev_list and input_handler_list. | |
45 | * This also causes input_[un]register_device and input_[un]register_handler | |
46 | * be mutually exclusive which simplifies locking in drivers implementing | |
47 | * input handlers. | |
48 | */ | |
49 | static DEFINE_MUTEX(input_mutex); | |
50 | ||
4369c64c HR |
51 | static const struct input_value input_value_sync = { EV_SYN, SYN_REPORT, 1 }; |
52 | ||
8006479c DT |
53 | static inline int is_event_supported(unsigned int code, |
54 | unsigned long *bm, unsigned int max) | |
1da177e4 | 55 | { |
8006479c DT |
56 | return code <= max && test_bit(code, bm); |
57 | } | |
1da177e4 | 58 | |
8006479c DT |
59 | static int input_defuzz_abs_event(int value, int old_val, int fuzz) |
60 | { | |
61 | if (fuzz) { | |
62 | if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2) | |
63 | return old_val; | |
1da177e4 | 64 | |
8006479c DT |
65 | if (value > old_val - fuzz && value < old_val + fuzz) |
66 | return (old_val * 3 + value) / 4; | |
1da177e4 | 67 | |
8006479c DT |
68 | if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2) |
69 | return (old_val + value) / 2; | |
70 | } | |
1da177e4 | 71 | |
8006479c DT |
72 | return value; |
73 | } | |
1da177e4 | 74 | |
352ac4bd HR |
75 | static void input_start_autorepeat(struct input_dev *dev, int code) |
76 | { | |
77 | if (test_bit(EV_REP, dev->evbit) && | |
78 | dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && | |
79 | dev->timer.data) { | |
80 | dev->repeat_key = code; | |
81 | mod_timer(&dev->timer, | |
82 | jiffies + msecs_to_jiffies(dev->rep[REP_DELAY])); | |
83 | } | |
84 | } | |
85 | ||
86 | static void input_stop_autorepeat(struct input_dev *dev) | |
87 | { | |
88 | del_timer(&dev->timer); | |
89 | } | |
90 | ||
8006479c | 91 | /* |
ef7995f4 DT |
92 | * Pass event first through all filters and then, if event has not been |
93 | * filtered out, through all open handles. This function is called with | |
82ba56c2 | 94 | * dev->event_lock held and interrupts disabled. |
8006479c | 95 | */ |
4369c64c HR |
96 | static unsigned int input_to_handler(struct input_handle *handle, |
97 | struct input_value *vals, unsigned int count) | |
8006479c | 98 | { |
4369c64c HR |
99 | struct input_handler *handler = handle->handler; |
100 | struct input_value *end = vals; | |
101 | struct input_value *v; | |
82ba56c2 | 102 | |
4369c64c HR |
103 | for (v = vals; v != vals + count; v++) { |
104 | if (handler->filter && | |
105 | handler->filter(handle, v->type, v->code, v->value)) | |
106 | continue; | |
107 | if (end != v) | |
108 | *end = *v; | |
109 | end++; | |
110 | } | |
1da177e4 | 111 | |
4369c64c HR |
112 | count = end - vals; |
113 | if (!count) | |
114 | return 0; | |
ef7995f4 | 115 | |
4369c64c HR |
116 | if (handler->events) |
117 | handler->events(handle, vals, count); | |
118 | else if (handler->event) | |
119 | for (v = vals; v != end; v++) | |
120 | handler->event(handle, v->type, v->code, v->value); | |
ef7995f4 | 121 | |
4369c64c HR |
122 | return count; |
123 | } | |
ef7995f4 | 124 | |
4369c64c HR |
125 | /* |
126 | * Pass values first through all filters and then, if event has not been | |
127 | * filtered out, through all open handles. This function is called with | |
128 | * dev->event_lock held and interrupts disabled. | |
129 | */ | |
130 | static void input_pass_values(struct input_dev *dev, | |
131 | struct input_value *vals, unsigned int count) | |
8006479c | 132 | { |
82ba56c2 | 133 | struct input_handle *handle; |
4369c64c | 134 | struct input_value *v; |
ef7995f4 | 135 | |
4369c64c HR |
136 | if (!count) |
137 | return; | |
82ba56c2 DT |
138 | |
139 | rcu_read_lock(); | |
1da177e4 | 140 | |
82ba56c2 | 141 | handle = rcu_dereference(dev->grab); |
4369c64c HR |
142 | if (handle) { |
143 | count = input_to_handler(handle, vals, count); | |
144 | } else { | |
145 | list_for_each_entry_rcu(handle, &dev->h_list, d_node) | |
146 | if (handle->open) | |
147 | count = input_to_handler(handle, vals, count); | |
ef7995f4 | 148 | } |
ef7995f4 | 149 | |
82ba56c2 | 150 | rcu_read_unlock(); |
ef7995f4 | 151 | |
4369c64c | 152 | add_input_randomness(vals->type, vals->code, vals->value); |
ef7995f4 | 153 | |
352ac4bd | 154 | /* trigger auto repeat for key events */ |
4369c64c HR |
155 | for (v = vals; v != vals + count; v++) { |
156 | if (v->type == EV_KEY && v->value != 2) { | |
157 | if (v->value) | |
158 | input_start_autorepeat(dev, v->code); | |
159 | else | |
160 | input_stop_autorepeat(dev); | |
ef7995f4 DT |
161 | } |
162 | } | |
4369c64c | 163 | } |
ef7995f4 | 164 | |
4369c64c HR |
165 | static void input_pass_event(struct input_dev *dev, |
166 | unsigned int type, unsigned int code, int value) | |
167 | { | |
168 | struct input_value vals[] = { { type, code, value } }; | |
169 | ||
170 | input_pass_values(dev, vals, ARRAY_SIZE(vals)); | |
8006479c | 171 | } |
1da177e4 | 172 | |
8006479c DT |
173 | /* |
174 | * Generate software autorepeat event. Note that we take | |
175 | * dev->event_lock here to avoid racing with input_event | |
176 | * which may cause keys get "stuck". | |
177 | */ | |
178 | static void input_repeat_key(unsigned long data) | |
179 | { | |
180 | struct input_dev *dev = (void *) data; | |
181 | unsigned long flags; | |
1da177e4 | 182 | |
8006479c | 183 | spin_lock_irqsave(&dev->event_lock, flags); |
1da177e4 | 184 | |
8006479c DT |
185 | if (test_bit(dev->repeat_key, dev->key) && |
186 | is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) { | |
4369c64c HR |
187 | struct input_value vals[] = { |
188 | { EV_KEY, dev->repeat_key, 2 }, | |
189 | input_value_sync | |
190 | }; | |
1da177e4 | 191 | |
4369c64c | 192 | input_pass_values(dev, vals, ARRAY_SIZE(vals)); |
31581066 | 193 | |
8006479c DT |
194 | if (dev->rep[REP_PERIOD]) |
195 | mod_timer(&dev->timer, jiffies + | |
196 | msecs_to_jiffies(dev->rep[REP_PERIOD])); | |
197 | } | |
31581066 | 198 | |
8006479c DT |
199 | spin_unlock_irqrestore(&dev->event_lock, flags); |
200 | } | |
31581066 | 201 | |
8006479c DT |
202 | #define INPUT_IGNORE_EVENT 0 |
203 | #define INPUT_PASS_TO_HANDLERS 1 | |
204 | #define INPUT_PASS_TO_DEVICE 2 | |
4369c64c HR |
205 | #define INPUT_SLOT 4 |
206 | #define INPUT_FLUSH 8 | |
8006479c | 207 | #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE) |
1da177e4 | 208 | |
40d007e7 HR |
209 | static int input_handle_abs_event(struct input_dev *dev, |
210 | unsigned int code, int *pval) | |
211 | { | |
8d18fba2 | 212 | struct input_mt *mt = dev->mt; |
40d007e7 HR |
213 | bool is_mt_event; |
214 | int *pold; | |
215 | ||
216 | if (code == ABS_MT_SLOT) { | |
217 | /* | |
218 | * "Stage" the event; we'll flush it later, when we | |
144c0f88 | 219 | * get actual touch data. |
40d007e7 | 220 | */ |
8d18fba2 HR |
221 | if (mt && *pval >= 0 && *pval < mt->num_slots) |
222 | mt->slot = *pval; | |
40d007e7 HR |
223 | |
224 | return INPUT_IGNORE_EVENT; | |
225 | } | |
226 | ||
b89529a1 | 227 | is_mt_event = input_is_mt_value(code); |
40d007e7 HR |
228 | |
229 | if (!is_mt_event) { | |
d31b2865 | 230 | pold = &dev->absinfo[code].value; |
8d18fba2 HR |
231 | } else if (mt) { |
232 | pold = &mt->slots[mt->slot].abs[code - ABS_MT_FIRST]; | |
40d007e7 HR |
233 | } else { |
234 | /* | |
144c0f88 | 235 | * Bypass filtering for multi-touch events when |
40d007e7 HR |
236 | * not employing slots. |
237 | */ | |
238 | pold = NULL; | |
239 | } | |
240 | ||
241 | if (pold) { | |
242 | *pval = input_defuzz_abs_event(*pval, *pold, | |
d31b2865 | 243 | dev->absinfo[code].fuzz); |
40d007e7 HR |
244 | if (*pold == *pval) |
245 | return INPUT_IGNORE_EVENT; | |
246 | ||
247 | *pold = *pval; | |
248 | } | |
249 | ||
250 | /* Flush pending "slot" event */ | |
8d18fba2 HR |
251 | if (is_mt_event && mt && mt->slot != input_abs_get_val(dev, ABS_MT_SLOT)) { |
252 | input_abs_set_val(dev, ABS_MT_SLOT, mt->slot); | |
4369c64c | 253 | return INPUT_PASS_TO_HANDLERS | INPUT_SLOT; |
40d007e7 HR |
254 | } |
255 | ||
256 | return INPUT_PASS_TO_HANDLERS; | |
257 | } | |
258 | ||
4369c64c HR |
259 | static int input_get_disposition(struct input_dev *dev, |
260 | unsigned int type, unsigned int code, int value) | |
8006479c DT |
261 | { |
262 | int disposition = INPUT_IGNORE_EVENT; | |
1da177e4 | 263 | |
8006479c | 264 | switch (type) { |
1da177e4 | 265 | |
8006479c DT |
266 | case EV_SYN: |
267 | switch (code) { | |
268 | case SYN_CONFIG: | |
269 | disposition = INPUT_PASS_TO_ALL; | |
270 | break; | |
1da177e4 | 271 | |
8006479c | 272 | case SYN_REPORT: |
4369c64c | 273 | disposition = INPUT_PASS_TO_HANDLERS | INPUT_FLUSH; |
1da177e4 | 274 | break; |
5e5ee686 | 275 | case SYN_MT_REPORT: |
5e5ee686 HR |
276 | disposition = INPUT_PASS_TO_HANDLERS; |
277 | break; | |
8006479c DT |
278 | } |
279 | break; | |
1da177e4 | 280 | |
8006479c | 281 | case EV_KEY: |
0672120a | 282 | if (is_event_supported(code, dev->keybit, KEY_MAX)) { |
1da177e4 | 283 | |
0672120a HR |
284 | /* auto-repeat bypasses state updates */ |
285 | if (value == 2) { | |
286 | disposition = INPUT_PASS_TO_HANDLERS; | |
287 | break; | |
8006479c | 288 | } |
1da177e4 | 289 | |
0672120a | 290 | if (!!test_bit(code, dev->key) != !!value) { |
1da177e4 | 291 | |
8006479c | 292 | __change_bit(code, dev->key); |
0672120a | 293 | disposition = INPUT_PASS_TO_HANDLERS; |
8006479c | 294 | } |
8006479c DT |
295 | } |
296 | break; | |
1da177e4 | 297 | |
8006479c DT |
298 | case EV_SW: |
299 | if (is_event_supported(code, dev->swbit, SW_MAX) && | |
0672120a | 300 | !!test_bit(code, dev->sw) != !!value) { |
1da177e4 | 301 | |
8006479c DT |
302 | __change_bit(code, dev->sw); |
303 | disposition = INPUT_PASS_TO_HANDLERS; | |
304 | } | |
305 | break; | |
1da177e4 | 306 | |
8006479c | 307 | case EV_ABS: |
40d007e7 | 308 | if (is_event_supported(code, dev->absbit, ABS_MAX)) |
9ae4345a | 309 | disposition = input_handle_abs_event(dev, code, &value); |
61994a61 | 310 | |
8006479c | 311 | break; |
1da177e4 | 312 | |
8006479c DT |
313 | case EV_REL: |
314 | if (is_event_supported(code, dev->relbit, REL_MAX) && value) | |
315 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 316 | |
8006479c | 317 | break; |
1e0afb28 | 318 | |
8006479c DT |
319 | case EV_MSC: |
320 | if (is_event_supported(code, dev->mscbit, MSC_MAX)) | |
321 | disposition = INPUT_PASS_TO_ALL; | |
1da177e4 | 322 | |
8006479c | 323 | break; |
1da177e4 | 324 | |
8006479c DT |
325 | case EV_LED: |
326 | if (is_event_supported(code, dev->ledbit, LED_MAX) && | |
0672120a | 327 | !!test_bit(code, dev->led) != !!value) { |
1da177e4 | 328 | |
8006479c DT |
329 | __change_bit(code, dev->led); |
330 | disposition = INPUT_PASS_TO_ALL; | |
331 | } | |
332 | break; | |
333 | ||
334 | case EV_SND: | |
335 | if (is_event_supported(code, dev->sndbit, SND_MAX)) { | |
1da177e4 | 336 | |
8fdc1948 | 337 | if (!!test_bit(code, dev->snd) != !!value) |
8006479c DT |
338 | __change_bit(code, dev->snd); |
339 | disposition = INPUT_PASS_TO_ALL; | |
340 | } | |
341 | break; | |
8fdc1948 | 342 | |
8006479c DT |
343 | case EV_REP: |
344 | if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) { | |
345 | dev->rep[code] = value; | |
346 | disposition = INPUT_PASS_TO_ALL; | |
347 | } | |
348 | break; | |
1da177e4 | 349 | |
8006479c DT |
350 | case EV_FF: |
351 | if (value >= 0) | |
352 | disposition = INPUT_PASS_TO_ALL; | |
353 | break; | |
ed2fa4dd RP |
354 | |
355 | case EV_PWR: | |
356 | disposition = INPUT_PASS_TO_ALL; | |
357 | break; | |
8006479c | 358 | } |
1da177e4 | 359 | |
4369c64c HR |
360 | return disposition; |
361 | } | |
362 | ||
363 | static void input_handle_event(struct input_dev *dev, | |
364 | unsigned int type, unsigned int code, int value) | |
365 | { | |
366 | int disposition; | |
367 | ||
368 | disposition = input_get_disposition(dev, type, code, value); | |
1da177e4 | 369 | |
8006479c DT |
370 | if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event) |
371 | dev->event(dev, type, code, value); | |
1da177e4 | 372 | |
4369c64c HR |
373 | if (!dev->vals) |
374 | return; | |
375 | ||
376 | if (disposition & INPUT_PASS_TO_HANDLERS) { | |
377 | struct input_value *v; | |
378 | ||
379 | if (disposition & INPUT_SLOT) { | |
380 | v = &dev->vals[dev->num_vals++]; | |
381 | v->type = EV_ABS; | |
382 | v->code = ABS_MT_SLOT; | |
383 | v->value = dev->mt->slot; | |
384 | } | |
385 | ||
386 | v = &dev->vals[dev->num_vals++]; | |
387 | v->type = type; | |
388 | v->code = code; | |
389 | v->value = value; | |
390 | } | |
391 | ||
392 | if (disposition & INPUT_FLUSH) { | |
393 | if (dev->num_vals >= 2) | |
394 | input_pass_values(dev, dev->vals, dev->num_vals); | |
395 | dev->num_vals = 0; | |
396 | } else if (dev->num_vals >= dev->max_vals - 2) { | |
397 | dev->vals[dev->num_vals++] = input_value_sync; | |
398 | input_pass_values(dev, dev->vals, dev->num_vals); | |
399 | dev->num_vals = 0; | |
400 | } | |
401 | ||
8006479c | 402 | } |
1da177e4 | 403 | |
8006479c DT |
404 | /** |
405 | * input_event() - report new input event | |
406 | * @dev: device that generated the event | |
407 | * @type: type of the event | |
408 | * @code: event code | |
409 | * @value: value of the event | |
410 | * | |
411 | * This function should be used by drivers implementing various input | |
df2d4637 DT |
412 | * devices to report input events. See also input_inject_event(). |
413 | * | |
414 | * NOTE: input_event() may be safely used right after input device was | |
415 | * allocated with input_allocate_device(), even before it is registered | |
416 | * with input_register_device(), but the event will not reach any of the | |
417 | * input handlers. Such early invocation of input_event() may be used | |
418 | * to 'seed' initial state of a switch or initial position of absolute | |
419 | * axis, etc. | |
8006479c | 420 | */ |
8006479c DT |
421 | void input_event(struct input_dev *dev, |
422 | unsigned int type, unsigned int code, int value) | |
423 | { | |
424 | unsigned long flags; | |
509ca1a9 | 425 | |
8006479c | 426 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
509ca1a9 | 427 | |
8006479c | 428 | spin_lock_irqsave(&dev->event_lock, flags); |
9ae4345a | 429 | input_handle_event(dev, type, code, value); |
8006479c | 430 | spin_unlock_irqrestore(&dev->event_lock, flags); |
1da177e4 | 431 | } |
1da177e4 | 432 | } |
ca56fe07 | 433 | EXPORT_SYMBOL(input_event); |
1da177e4 | 434 | |
0e739d28 DT |
435 | /** |
436 | * input_inject_event() - send input event from input handler | |
437 | * @handle: input handle to send event through | |
438 | * @type: type of the event | |
439 | * @code: event code | |
440 | * @value: value of the event | |
441 | * | |
8006479c DT |
442 | * Similar to input_event() but will ignore event if device is |
443 | * "grabbed" and handle injecting event is not the one that owns | |
444 | * the device. | |
0e739d28 | 445 | */ |
8006479c DT |
446 | void input_inject_event(struct input_handle *handle, |
447 | unsigned int type, unsigned int code, int value) | |
1da177e4 | 448 | { |
8006479c DT |
449 | struct input_dev *dev = handle->dev; |
450 | struct input_handle *grab; | |
451 | unsigned long flags; | |
1da177e4 | 452 | |
8006479c DT |
453 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
454 | spin_lock_irqsave(&dev->event_lock, flags); | |
1da177e4 | 455 | |
82ba56c2 | 456 | rcu_read_lock(); |
8006479c DT |
457 | grab = rcu_dereference(dev->grab); |
458 | if (!grab || grab == handle) | |
9ae4345a | 459 | input_handle_event(dev, type, code, value); |
82ba56c2 | 460 | rcu_read_unlock(); |
1da177e4 | 461 | |
8006479c DT |
462 | spin_unlock_irqrestore(&dev->event_lock, flags); |
463 | } | |
1da177e4 | 464 | } |
8006479c | 465 | EXPORT_SYMBOL(input_inject_event); |
1da177e4 | 466 | |
d31b2865 DM |
467 | /** |
468 | * input_alloc_absinfo - allocates array of input_absinfo structs | |
469 | * @dev: the input device emitting absolute events | |
470 | * | |
471 | * If the absinfo struct the caller asked for is already allocated, this | |
472 | * functions will not do anything. | |
473 | */ | |
474 | void input_alloc_absinfo(struct input_dev *dev) | |
475 | { | |
476 | if (!dev->absinfo) | |
477 | dev->absinfo = kcalloc(ABS_CNT, sizeof(struct input_absinfo), | |
478 | GFP_KERNEL); | |
479 | ||
480 | WARN(!dev->absinfo, "%s(): kcalloc() failed?\n", __func__); | |
481 | } | |
482 | EXPORT_SYMBOL(input_alloc_absinfo); | |
483 | ||
484 | void input_set_abs_params(struct input_dev *dev, unsigned int axis, | |
485 | int min, int max, int fuzz, int flat) | |
486 | { | |
487 | struct input_absinfo *absinfo; | |
488 | ||
489 | input_alloc_absinfo(dev); | |
490 | if (!dev->absinfo) | |
491 | return; | |
492 | ||
493 | absinfo = &dev->absinfo[axis]; | |
494 | absinfo->minimum = min; | |
495 | absinfo->maximum = max; | |
496 | absinfo->fuzz = fuzz; | |
497 | absinfo->flat = flat; | |
498 | ||
499 | dev->absbit[BIT_WORD(axis)] |= BIT_MASK(axis); | |
500 | } | |
501 | EXPORT_SYMBOL(input_set_abs_params); | |
502 | ||
503 | ||
8006479c DT |
504 | /** |
505 | * input_grab_device - grabs device for exclusive use | |
506 | * @handle: input handle that wants to own the device | |
507 | * | |
508 | * When a device is grabbed by an input handle all events generated by | |
509 | * the device are delivered only to this handle. Also events injected | |
510 | * by other input handles are ignored while device is grabbed. | |
511 | */ | |
1da177e4 LT |
512 | int input_grab_device(struct input_handle *handle) |
513 | { | |
8006479c DT |
514 | struct input_dev *dev = handle->dev; |
515 | int retval; | |
1da177e4 | 516 | |
8006479c DT |
517 | retval = mutex_lock_interruptible(&dev->mutex); |
518 | if (retval) | |
519 | return retval; | |
520 | ||
521 | if (dev->grab) { | |
522 | retval = -EBUSY; | |
523 | goto out; | |
524 | } | |
525 | ||
526 | rcu_assign_pointer(dev->grab, handle); | |
8006479c DT |
527 | |
528 | out: | |
529 | mutex_unlock(&dev->mutex); | |
530 | return retval; | |
1da177e4 | 531 | } |
ca56fe07 | 532 | EXPORT_SYMBOL(input_grab_device); |
1da177e4 | 533 | |
8006479c | 534 | static void __input_release_device(struct input_handle *handle) |
1da177e4 | 535 | { |
a2b2ed2c | 536 | struct input_dev *dev = handle->dev; |
adc4633c | 537 | struct input_handle *grabber; |
c7e8dc6e | 538 | |
adc4633c DT |
539 | grabber = rcu_dereference_protected(dev->grab, |
540 | lockdep_is_held(&dev->mutex)); | |
541 | if (grabber == handle) { | |
8006479c DT |
542 | rcu_assign_pointer(dev->grab, NULL); |
543 | /* Make sure input_pass_event() notices that grab is gone */ | |
82ba56c2 | 544 | synchronize_rcu(); |
a2b2ed2c AM |
545 | |
546 | list_for_each_entry(handle, &dev->h_list, d_node) | |
8006479c | 547 | if (handle->open && handle->handler->start) |
c7e8dc6e DT |
548 | handle->handler->start(handle); |
549 | } | |
1da177e4 | 550 | } |
8006479c DT |
551 | |
552 | /** | |
553 | * input_release_device - release previously grabbed device | |
554 | * @handle: input handle that owns the device | |
555 | * | |
556 | * Releases previously grabbed device so that other input handles can | |
557 | * start receiving input events. Upon release all handlers attached | |
558 | * to the device have their start() method called so they have a change | |
559 | * to synchronize device state with the rest of the system. | |
560 | */ | |
561 | void input_release_device(struct input_handle *handle) | |
562 | { | |
563 | struct input_dev *dev = handle->dev; | |
564 | ||
565 | mutex_lock(&dev->mutex); | |
566 | __input_release_device(handle); | |
567 | mutex_unlock(&dev->mutex); | |
568 | } | |
ca56fe07 | 569 | EXPORT_SYMBOL(input_release_device); |
1da177e4 | 570 | |
8006479c DT |
571 | /** |
572 | * input_open_device - open input device | |
573 | * @handle: handle through which device is being accessed | |
574 | * | |
575 | * This function should be called by input handlers when they | |
576 | * want to start receive events from given input device. | |
577 | */ | |
1da177e4 LT |
578 | int input_open_device(struct input_handle *handle) |
579 | { | |
0fbf87ca | 580 | struct input_dev *dev = handle->dev; |
8006479c | 581 | int retval; |
0fbf87ca | 582 | |
8006479c DT |
583 | retval = mutex_lock_interruptible(&dev->mutex); |
584 | if (retval) | |
585 | return retval; | |
586 | ||
587 | if (dev->going_away) { | |
588 | retval = -ENODEV; | |
589 | goto out; | |
590 | } | |
0fbf87ca | 591 | |
1da177e4 | 592 | handle->open++; |
0fbf87ca DT |
593 | |
594 | if (!dev->users++ && dev->open) | |
8006479c DT |
595 | retval = dev->open(dev); |
596 | ||
597 | if (retval) { | |
598 | dev->users--; | |
599 | if (!--handle->open) { | |
600 | /* | |
601 | * Make sure we are not delivering any more events | |
602 | * through this handle | |
603 | */ | |
82ba56c2 | 604 | synchronize_rcu(); |
8006479c DT |
605 | } |
606 | } | |
0fbf87ca | 607 | |
8006479c | 608 | out: |
e676c232 | 609 | mutex_unlock(&dev->mutex); |
8006479c | 610 | return retval; |
1da177e4 | 611 | } |
ca56fe07 | 612 | EXPORT_SYMBOL(input_open_device); |
1da177e4 | 613 | |
8006479c | 614 | int input_flush_device(struct input_handle *handle, struct file *file) |
1da177e4 | 615 | { |
8006479c DT |
616 | struct input_dev *dev = handle->dev; |
617 | int retval; | |
1da177e4 | 618 | |
8006479c DT |
619 | retval = mutex_lock_interruptible(&dev->mutex); |
620 | if (retval) | |
621 | return retval; | |
622 | ||
623 | if (dev->flush) | |
624 | retval = dev->flush(dev, file); | |
625 | ||
626 | mutex_unlock(&dev->mutex); | |
627 | return retval; | |
1da177e4 | 628 | } |
ca56fe07 | 629 | EXPORT_SYMBOL(input_flush_device); |
1da177e4 | 630 | |
8006479c DT |
631 | /** |
632 | * input_close_device - close input device | |
633 | * @handle: handle through which device is being accessed | |
634 | * | |
635 | * This function should be called by input handlers when they | |
636 | * want to stop receive events from given input device. | |
637 | */ | |
1da177e4 LT |
638 | void input_close_device(struct input_handle *handle) |
639 | { | |
0fbf87ca DT |
640 | struct input_dev *dev = handle->dev; |
641 | ||
e676c232 | 642 | mutex_lock(&dev->mutex); |
0fbf87ca | 643 | |
8006479c DT |
644 | __input_release_device(handle); |
645 | ||
0fbf87ca DT |
646 | if (!--dev->users && dev->close) |
647 | dev->close(dev); | |
8006479c DT |
648 | |
649 | if (!--handle->open) { | |
650 | /* | |
82ba56c2 | 651 | * synchronize_rcu() makes sure that input_pass_event() |
8006479c DT |
652 | * completed and that no more input events are delivered |
653 | * through this handle | |
654 | */ | |
82ba56c2 | 655 | synchronize_rcu(); |
8006479c | 656 | } |
0fbf87ca | 657 | |
e676c232 | 658 | mutex_unlock(&dev->mutex); |
1da177e4 | 659 | } |
ca56fe07 | 660 | EXPORT_SYMBOL(input_close_device); |
1da177e4 | 661 | |
866d7d7b ON |
662 | /* |
663 | * Simulate keyup events for all keys that are marked as pressed. | |
664 | * The function must be called with dev->event_lock held. | |
665 | */ | |
666 | static void input_dev_release_keys(struct input_dev *dev) | |
667 | { | |
668 | int code; | |
669 | ||
670 | if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) { | |
671 | for (code = 0; code <= KEY_MAX; code++) { | |
672 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
673 | __test_and_clear_bit(code, dev->key)) { | |
9ae4345a | 674 | input_pass_event(dev, EV_KEY, code, 0); |
866d7d7b ON |
675 | } |
676 | } | |
9ae4345a | 677 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); |
866d7d7b ON |
678 | } |
679 | } | |
680 | ||
8006479c DT |
681 | /* |
682 | * Prepare device for unregistering | |
683 | */ | |
684 | static void input_disconnect_device(struct input_dev *dev) | |
685 | { | |
686 | struct input_handle *handle; | |
8006479c DT |
687 | |
688 | /* | |
689 | * Mark device as going away. Note that we take dev->mutex here | |
690 | * not to protect access to dev->going_away but rather to ensure | |
691 | * that there are no threads in the middle of input_open_device() | |
692 | */ | |
693 | mutex_lock(&dev->mutex); | |
ffd0db97 | 694 | dev->going_away = true; |
8006479c DT |
695 | mutex_unlock(&dev->mutex); |
696 | ||
697 | spin_lock_irq(&dev->event_lock); | |
698 | ||
699 | /* | |
700 | * Simulate keyup events for all pressed keys so that handlers | |
701 | * are not left with "stuck" keys. The driver may continue | |
702 | * generate events even after we done here but they will not | |
703 | * reach any handlers. | |
704 | */ | |
866d7d7b | 705 | input_dev_release_keys(dev); |
8006479c DT |
706 | |
707 | list_for_each_entry(handle, &dev->h_list, d_node) | |
708 | handle->open = 0; | |
709 | ||
710 | spin_unlock_irq(&dev->event_lock); | |
711 | } | |
712 | ||
8613e4c2 MCC |
713 | /** |
714 | * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry | |
715 | * @ke: keymap entry containing scancode to be converted. | |
716 | * @scancode: pointer to the location where converted scancode should | |
717 | * be stored. | |
718 | * | |
719 | * This function is used to convert scancode stored in &struct keymap_entry | |
720 | * into scalar form understood by legacy keymap handling methods. These | |
721 | * methods expect scancodes to be represented as 'unsigned int'. | |
722 | */ | |
723 | int input_scancode_to_scalar(const struct input_keymap_entry *ke, | |
724 | unsigned int *scancode) | |
725 | { | |
726 | switch (ke->len) { | |
727 | case 1: | |
728 | *scancode = *((u8 *)ke->scancode); | |
729 | break; | |
730 | ||
731 | case 2: | |
732 | *scancode = *((u16 *)ke->scancode); | |
733 | break; | |
734 | ||
735 | case 4: | |
736 | *scancode = *((u32 *)ke->scancode); | |
737 | break; | |
738 | ||
739 | default: | |
740 | return -EINVAL; | |
741 | } | |
742 | ||
743 | return 0; | |
744 | } | |
745 | EXPORT_SYMBOL(input_scancode_to_scalar); | |
746 | ||
747 | /* | |
748 | * Those routines handle the default case where no [gs]etkeycode() is | |
749 | * defined. In this case, an array indexed by the scancode is used. | |
750 | */ | |
751 | ||
752 | static unsigned int input_fetch_keycode(struct input_dev *dev, | |
753 | unsigned int index) | |
c8e4c772 MR |
754 | { |
755 | switch (dev->keycodesize) { | |
8613e4c2 MCC |
756 | case 1: |
757 | return ((u8 *)dev->keycode)[index]; | |
c8e4c772 | 758 | |
8613e4c2 MCC |
759 | case 2: |
760 | return ((u16 *)dev->keycode)[index]; | |
c8e4c772 | 761 | |
8613e4c2 MCC |
762 | default: |
763 | return ((u32 *)dev->keycode)[index]; | |
c8e4c772 MR |
764 | } |
765 | } | |
766 | ||
767 | static int input_default_getkeycode(struct input_dev *dev, | |
8613e4c2 | 768 | struct input_keymap_entry *ke) |
c8e4c772 | 769 | { |
8613e4c2 MCC |
770 | unsigned int index; |
771 | int error; | |
772 | ||
c8e4c772 MR |
773 | if (!dev->keycodesize) |
774 | return -EINVAL; | |
775 | ||
8613e4c2 MCC |
776 | if (ke->flags & INPUT_KEYMAP_BY_INDEX) |
777 | index = ke->index; | |
778 | else { | |
779 | error = input_scancode_to_scalar(ke, &index); | |
780 | if (error) | |
781 | return error; | |
782 | } | |
783 | ||
784 | if (index >= dev->keycodemax) | |
c8e4c772 MR |
785 | return -EINVAL; |
786 | ||
8613e4c2 MCC |
787 | ke->keycode = input_fetch_keycode(dev, index); |
788 | ke->index = index; | |
789 | ke->len = sizeof(index); | |
790 | memcpy(ke->scancode, &index, sizeof(index)); | |
c8e4c772 MR |
791 | |
792 | return 0; | |
793 | } | |
794 | ||
795 | static int input_default_setkeycode(struct input_dev *dev, | |
8613e4c2 MCC |
796 | const struct input_keymap_entry *ke, |
797 | unsigned int *old_keycode) | |
c8e4c772 | 798 | { |
8613e4c2 MCC |
799 | unsigned int index; |
800 | int error; | |
c8e4c772 MR |
801 | int i; |
802 | ||
8613e4c2 | 803 | if (!dev->keycodesize) |
c8e4c772 MR |
804 | return -EINVAL; |
805 | ||
8613e4c2 MCC |
806 | if (ke->flags & INPUT_KEYMAP_BY_INDEX) { |
807 | index = ke->index; | |
808 | } else { | |
809 | error = input_scancode_to_scalar(ke, &index); | |
810 | if (error) | |
811 | return error; | |
812 | } | |
813 | ||
814 | if (index >= dev->keycodemax) | |
c8e4c772 MR |
815 | return -EINVAL; |
816 | ||
de391d12 | 817 | if (dev->keycodesize < sizeof(ke->keycode) && |
8613e4c2 | 818 | (ke->keycode >> (dev->keycodesize * 8))) |
c8e4c772 MR |
819 | return -EINVAL; |
820 | ||
821 | switch (dev->keycodesize) { | |
822 | case 1: { | |
823 | u8 *k = (u8 *)dev->keycode; | |
8613e4c2 MCC |
824 | *old_keycode = k[index]; |
825 | k[index] = ke->keycode; | |
c8e4c772 MR |
826 | break; |
827 | } | |
828 | case 2: { | |
829 | u16 *k = (u16 *)dev->keycode; | |
8613e4c2 MCC |
830 | *old_keycode = k[index]; |
831 | k[index] = ke->keycode; | |
c8e4c772 MR |
832 | break; |
833 | } | |
834 | default: { | |
835 | u32 *k = (u32 *)dev->keycode; | |
8613e4c2 MCC |
836 | *old_keycode = k[index]; |
837 | k[index] = ke->keycode; | |
c8e4c772 MR |
838 | break; |
839 | } | |
840 | } | |
841 | ||
8613e4c2 MCC |
842 | __clear_bit(*old_keycode, dev->keybit); |
843 | __set_bit(ke->keycode, dev->keybit); | |
c8e4c772 MR |
844 | |
845 | for (i = 0; i < dev->keycodemax; i++) { | |
8613e4c2 MCC |
846 | if (input_fetch_keycode(dev, i) == *old_keycode) { |
847 | __set_bit(*old_keycode, dev->keybit); | |
c8e4c772 MR |
848 | break; /* Setting the bit twice is useless, so break */ |
849 | } | |
850 | } | |
851 | ||
852 | return 0; | |
853 | } | |
854 | ||
f4f37c8e DT |
855 | /** |
856 | * input_get_keycode - retrieve keycode currently mapped to a given scancode | |
857 | * @dev: input device which keymap is being queried | |
8613e4c2 | 858 | * @ke: keymap entry |
f4f37c8e DT |
859 | * |
860 | * This function should be called by anyone interested in retrieving current | |
8613e4c2 | 861 | * keymap. Presently evdev handlers use it. |
f4f37c8e | 862 | */ |
8613e4c2 | 863 | int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke) |
f4f37c8e | 864 | { |
2e2e3b96 DT |
865 | unsigned long flags; |
866 | int retval; | |
867 | ||
868 | spin_lock_irqsave(&dev->event_lock, flags); | |
aebd636b | 869 | retval = dev->getkeycode(dev, ke); |
8613e4c2 | 870 | spin_unlock_irqrestore(&dev->event_lock, flags); |
aebd636b | 871 | |
2e2e3b96 | 872 | return retval; |
f4f37c8e DT |
873 | } |
874 | EXPORT_SYMBOL(input_get_keycode); | |
875 | ||
876 | /** | |
8613e4c2 | 877 | * input_set_keycode - attribute a keycode to a given scancode |
f4f37c8e | 878 | * @dev: input device which keymap is being updated |
8613e4c2 | 879 | * @ke: new keymap entry |
f4f37c8e DT |
880 | * |
881 | * This function should be called by anyone needing to update current | |
882 | * keymap. Presently keyboard and evdev handlers use it. | |
883 | */ | |
58b93995 | 884 | int input_set_keycode(struct input_dev *dev, |
8613e4c2 | 885 | const struct input_keymap_entry *ke) |
f4f37c8e DT |
886 | { |
887 | unsigned long flags; | |
fd6cf3dd | 888 | unsigned int old_keycode; |
f4f37c8e DT |
889 | int retval; |
890 | ||
8613e4c2 | 891 | if (ke->keycode > KEY_MAX) |
f4f37c8e DT |
892 | return -EINVAL; |
893 | ||
894 | spin_lock_irqsave(&dev->event_lock, flags); | |
895 | ||
aebd636b | 896 | retval = dev->setkeycode(dev, ke, &old_keycode); |
f4f37c8e DT |
897 | if (retval) |
898 | goto out; | |
899 | ||
4f93df40 DT |
900 | /* Make sure KEY_RESERVED did not get enabled. */ |
901 | __clear_bit(KEY_RESERVED, dev->keybit); | |
902 | ||
f4f37c8e DT |
903 | /* |
904 | * Simulate keyup event if keycode is not present | |
905 | * in the keymap anymore | |
906 | */ | |
907 | if (test_bit(EV_KEY, dev->evbit) && | |
908 | !is_event_supported(old_keycode, dev->keybit, KEY_MAX) && | |
909 | __test_and_clear_bit(old_keycode, dev->key)) { | |
4369c64c HR |
910 | struct input_value vals[] = { |
911 | { EV_KEY, old_keycode, 0 }, | |
912 | input_value_sync | |
913 | }; | |
f4f37c8e | 914 | |
4369c64c | 915 | input_pass_values(dev, vals, ARRAY_SIZE(vals)); |
f4f37c8e DT |
916 | } |
917 | ||
918 | out: | |
919 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
920 | ||
921 | return retval; | |
922 | } | |
923 | EXPORT_SYMBOL(input_set_keycode); | |
c8e4c772 | 924 | |
0b7024ac | 925 | static const struct input_device_id *input_match_device(struct input_handler *handler, |
66e66118 | 926 | struct input_dev *dev) |
1da177e4 | 927 | { |
0b7024ac | 928 | const struct input_device_id *id; |
1da177e4 | 929 | |
0b7024ac | 930 | for (id = handler->id_table; id->flags || id->driver_info; id++) { |
1da177e4 LT |
931 | |
932 | if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) | |
ddc5d341 | 933 | if (id->bustype != dev->id.bustype) |
1da177e4 LT |
934 | continue; |
935 | ||
936 | if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) | |
ddc5d341 | 937 | if (id->vendor != dev->id.vendor) |
1da177e4 LT |
938 | continue; |
939 | ||
940 | if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) | |
ddc5d341 | 941 | if (id->product != dev->id.product) |
1da177e4 LT |
942 | continue; |
943 | ||
944 | if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) | |
ddc5d341 | 945 | if (id->version != dev->id.version) |
1da177e4 LT |
946 | continue; |
947 | ||
c0bb1f97 DT |
948 | if (!bitmap_subset(id->evbit, dev->evbit, EV_MAX)) |
949 | continue; | |
950 | ||
951 | if (!bitmap_subset(id->keybit, dev->keybit, KEY_MAX)) | |
952 | continue; | |
953 | ||
954 | if (!bitmap_subset(id->relbit, dev->relbit, REL_MAX)) | |
955 | continue; | |
956 | ||
957 | if (!bitmap_subset(id->absbit, dev->absbit, ABS_MAX)) | |
958 | continue; | |
959 | ||
960 | if (!bitmap_subset(id->mscbit, dev->mscbit, MSC_MAX)) | |
961 | continue; | |
962 | ||
963 | if (!bitmap_subset(id->ledbit, dev->ledbit, LED_MAX)) | |
964 | continue; | |
965 | ||
966 | if (!bitmap_subset(id->sndbit, dev->sndbit, SND_MAX)) | |
967 | continue; | |
968 | ||
969 | if (!bitmap_subset(id->ffbit, dev->ffbit, FF_MAX)) | |
970 | continue; | |
971 | ||
972 | if (!bitmap_subset(id->swbit, dev->swbit, SW_MAX)) | |
973 | continue; | |
1da177e4 | 974 | |
0b7024ac DT |
975 | if (!handler->match || handler->match(handler, dev)) |
976 | return id; | |
1da177e4 LT |
977 | } |
978 | ||
979 | return NULL; | |
980 | } | |
981 | ||
5b2a0826 DT |
982 | static int input_attach_handler(struct input_dev *dev, struct input_handler *handler) |
983 | { | |
984 | const struct input_device_id *id; | |
985 | int error; | |
986 | ||
0b7024ac | 987 | id = input_match_device(handler, dev); |
5b2a0826 DT |
988 | if (!id) |
989 | return -ENODEV; | |
990 | ||
991 | error = handler->connect(handler, dev, id); | |
992 | if (error && error != -ENODEV) | |
da0c4901 JP |
993 | pr_err("failed to attach handler %s to device %s, error: %d\n", |
994 | handler->name, kobject_name(&dev->dev.kobj), error); | |
5b2a0826 DT |
995 | |
996 | return error; | |
997 | } | |
998 | ||
15e184af DT |
999 | #ifdef CONFIG_COMPAT |
1000 | ||
1001 | static int input_bits_to_string(char *buf, int buf_size, | |
1002 | unsigned long bits, bool skip_empty) | |
1003 | { | |
1004 | int len = 0; | |
1005 | ||
1006 | if (INPUT_COMPAT_TEST) { | |
1007 | u32 dword = bits >> 32; | |
1008 | if (dword || !skip_empty) | |
1009 | len += snprintf(buf, buf_size, "%x ", dword); | |
1010 | ||
1011 | dword = bits & 0xffffffffUL; | |
1012 | if (dword || !skip_empty || len) | |
1013 | len += snprintf(buf + len, max(buf_size - len, 0), | |
1014 | "%x", dword); | |
1015 | } else { | |
1016 | if (bits || !skip_empty) | |
1017 | len += snprintf(buf, buf_size, "%lx", bits); | |
1018 | } | |
1019 | ||
1020 | return len; | |
1021 | } | |
1022 | ||
1023 | #else /* !CONFIG_COMPAT */ | |
1024 | ||
1025 | static int input_bits_to_string(char *buf, int buf_size, | |
1026 | unsigned long bits, bool skip_empty) | |
1027 | { | |
1028 | return bits || !skip_empty ? | |
1029 | snprintf(buf, buf_size, "%lx", bits) : 0; | |
1030 | } | |
1031 | ||
1032 | #endif | |
5b2a0826 | 1033 | |
f96b434d DT |
1034 | #ifdef CONFIG_PROC_FS |
1035 | ||
1036 | static struct proc_dir_entry *proc_bus_input_dir; | |
1037 | static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); | |
1038 | static int input_devices_state; | |
1039 | ||
1040 | static inline void input_wakeup_procfs_readers(void) | |
1041 | { | |
1042 | input_devices_state++; | |
1043 | wake_up(&input_devices_poll_wait); | |
1044 | } | |
1045 | ||
969b21cd | 1046 | static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait) |
f96b434d | 1047 | { |
f96b434d | 1048 | poll_wait(file, &input_devices_poll_wait, wait); |
fa886612 DT |
1049 | if (file->f_version != input_devices_state) { |
1050 | file->f_version = input_devices_state; | |
f96b434d | 1051 | return POLLIN | POLLRDNORM; |
fa886612 | 1052 | } |
1e0afb28 | 1053 | |
f96b434d DT |
1054 | return 0; |
1055 | } | |
1056 | ||
1572ca2a DT |
1057 | union input_seq_state { |
1058 | struct { | |
1059 | unsigned short pos; | |
1060 | bool mutex_acquired; | |
1061 | }; | |
1062 | void *p; | |
1063 | }; | |
1064 | ||
969b21cd DT |
1065 | static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) |
1066 | { | |
1572ca2a DT |
1067 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1068 | int error; | |
1069 | ||
1070 | /* We need to fit into seq->private pointer */ | |
1071 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
1072 | ||
1073 | error = mutex_lock_interruptible(&input_mutex); | |
1074 | if (error) { | |
1075 | state->mutex_acquired = false; | |
1076 | return ERR_PTR(error); | |
1077 | } | |
1078 | ||
1079 | state->mutex_acquired = true; | |
f96b434d | 1080 | |
ad5d972c | 1081 | return seq_list_start(&input_dev_list, *pos); |
969b21cd | 1082 | } |
051b2fea | 1083 | |
969b21cd DT |
1084 | static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1085 | { | |
ad5d972c | 1086 | return seq_list_next(v, &input_dev_list, pos); |
969b21cd | 1087 | } |
f96b434d | 1088 | |
1572ca2a | 1089 | static void input_seq_stop(struct seq_file *seq, void *v) |
969b21cd | 1090 | { |
1572ca2a DT |
1091 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1092 | ||
1093 | if (state->mutex_acquired) | |
1094 | mutex_unlock(&input_mutex); | |
969b21cd | 1095 | } |
f96b434d | 1096 | |
969b21cd DT |
1097 | static void input_seq_print_bitmap(struct seq_file *seq, const char *name, |
1098 | unsigned long *bitmap, int max) | |
1099 | { | |
1100 | int i; | |
15e184af DT |
1101 | bool skip_empty = true; |
1102 | char buf[18]; | |
f96b434d | 1103 | |
969b21cd | 1104 | seq_printf(seq, "B: %s=", name); |
15e184af DT |
1105 | |
1106 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
1107 | if (input_bits_to_string(buf, sizeof(buf), | |
1108 | bitmap[i], skip_empty)) { | |
1109 | skip_empty = false; | |
1110 | seq_printf(seq, "%s%s", buf, i > 0 ? " " : ""); | |
1111 | } | |
1112 | } | |
1113 | ||
1114 | /* | |
1115 | * If no output was produced print a single 0. | |
1116 | */ | |
1117 | if (skip_empty) | |
1118 | seq_puts(seq, "0"); | |
1119 | ||
969b21cd DT |
1120 | seq_putc(seq, '\n'); |
1121 | } | |
f96b434d | 1122 | |
969b21cd DT |
1123 | static int input_devices_seq_show(struct seq_file *seq, void *v) |
1124 | { | |
1125 | struct input_dev *dev = container_of(v, struct input_dev, node); | |
9657d75c | 1126 | const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
969b21cd DT |
1127 | struct input_handle *handle; |
1128 | ||
1129 | seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", | |
1130 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); | |
1131 | ||
1132 | seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); | |
1133 | seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : ""); | |
1134 | seq_printf(seq, "S: Sysfs=%s\n", path ? path : ""); | |
15e03ae8 | 1135 | seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : ""); |
969b21cd DT |
1136 | seq_printf(seq, "H: Handlers="); |
1137 | ||
1138 | list_for_each_entry(handle, &dev->h_list, d_node) | |
1139 | seq_printf(seq, "%s ", handle->name); | |
1140 | seq_putc(seq, '\n'); | |
1141 | ||
85b77200 HR |
1142 | input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX); |
1143 | ||
969b21cd DT |
1144 | input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); |
1145 | if (test_bit(EV_KEY, dev->evbit)) | |
1146 | input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); | |
1147 | if (test_bit(EV_REL, dev->evbit)) | |
1148 | input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); | |
1149 | if (test_bit(EV_ABS, dev->evbit)) | |
1150 | input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); | |
1151 | if (test_bit(EV_MSC, dev->evbit)) | |
1152 | input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); | |
1153 | if (test_bit(EV_LED, dev->evbit)) | |
1154 | input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); | |
1155 | if (test_bit(EV_SND, dev->evbit)) | |
1156 | input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); | |
1157 | if (test_bit(EV_FF, dev->evbit)) | |
1158 | input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); | |
1159 | if (test_bit(EV_SW, dev->evbit)) | |
1160 | input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); | |
1161 | ||
1162 | seq_putc(seq, '\n'); | |
1163 | ||
1164 | kfree(path); | |
1165 | return 0; | |
f96b434d DT |
1166 | } |
1167 | ||
cec69c37 | 1168 | static const struct seq_operations input_devices_seq_ops = { |
969b21cd DT |
1169 | .start = input_devices_seq_start, |
1170 | .next = input_devices_seq_next, | |
1572ca2a | 1171 | .stop = input_seq_stop, |
969b21cd DT |
1172 | .show = input_devices_seq_show, |
1173 | }; | |
1174 | ||
1175 | static int input_proc_devices_open(struct inode *inode, struct file *file) | |
f96b434d | 1176 | { |
969b21cd DT |
1177 | return seq_open(file, &input_devices_seq_ops); |
1178 | } | |
1179 | ||
2b8693c0 | 1180 | static const struct file_operations input_devices_fileops = { |
969b21cd DT |
1181 | .owner = THIS_MODULE, |
1182 | .open = input_proc_devices_open, | |
1183 | .poll = input_proc_devices_poll, | |
1184 | .read = seq_read, | |
1185 | .llseek = seq_lseek, | |
1186 | .release = seq_release, | |
1187 | }; | |
1188 | ||
1189 | static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) | |
1190 | { | |
1572ca2a DT |
1191 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1192 | int error; | |
1193 | ||
1194 | /* We need to fit into seq->private pointer */ | |
1195 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
1196 | ||
1197 | error = mutex_lock_interruptible(&input_mutex); | |
1198 | if (error) { | |
1199 | state->mutex_acquired = false; | |
1200 | return ERR_PTR(error); | |
1201 | } | |
1202 | ||
1203 | state->mutex_acquired = true; | |
1204 | state->pos = *pos; | |
8006479c | 1205 | |
ad5d972c | 1206 | return seq_list_start(&input_handler_list, *pos); |
969b21cd | 1207 | } |
f96b434d | 1208 | |
969b21cd DT |
1209 | static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1210 | { | |
1572ca2a | 1211 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
f96b434d | 1212 | |
1572ca2a DT |
1213 | state->pos = *pos + 1; |
1214 | return seq_list_next(v, &input_handler_list, pos); | |
969b21cd DT |
1215 | } |
1216 | ||
1217 | static int input_handlers_seq_show(struct seq_file *seq, void *v) | |
1218 | { | |
1219 | struct input_handler *handler = container_of(v, struct input_handler, node); | |
1572ca2a | 1220 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
969b21cd | 1221 | |
1572ca2a | 1222 | seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name); |
ef7995f4 DT |
1223 | if (handler->filter) |
1224 | seq_puts(seq, " (filter)"); | |
7f8d4cad | 1225 | if (handler->legacy_minors) |
969b21cd DT |
1226 | seq_printf(seq, " Minor=%d", handler->minor); |
1227 | seq_putc(seq, '\n'); | |
1228 | ||
1229 | return 0; | |
1230 | } | |
1572ca2a | 1231 | |
cec69c37 | 1232 | static const struct seq_operations input_handlers_seq_ops = { |
969b21cd DT |
1233 | .start = input_handlers_seq_start, |
1234 | .next = input_handlers_seq_next, | |
1572ca2a | 1235 | .stop = input_seq_stop, |
969b21cd DT |
1236 | .show = input_handlers_seq_show, |
1237 | }; | |
1238 | ||
1239 | static int input_proc_handlers_open(struct inode *inode, struct file *file) | |
1240 | { | |
1241 | return seq_open(file, &input_handlers_seq_ops); | |
1242 | } | |
1243 | ||
2b8693c0 | 1244 | static const struct file_operations input_handlers_fileops = { |
969b21cd DT |
1245 | .owner = THIS_MODULE, |
1246 | .open = input_proc_handlers_open, | |
1247 | .read = seq_read, | |
1248 | .llseek = seq_lseek, | |
1249 | .release = seq_release, | |
1250 | }; | |
f96b434d DT |
1251 | |
1252 | static int __init input_proc_init(void) | |
1253 | { | |
1254 | struct proc_dir_entry *entry; | |
1255 | ||
9c37066d | 1256 | proc_bus_input_dir = proc_mkdir("bus/input", NULL); |
f96b434d DT |
1257 | if (!proc_bus_input_dir) |
1258 | return -ENOMEM; | |
1259 | ||
c7705f34 DL |
1260 | entry = proc_create("devices", 0, proc_bus_input_dir, |
1261 | &input_devices_fileops); | |
f96b434d DT |
1262 | if (!entry) |
1263 | goto fail1; | |
1264 | ||
c7705f34 DL |
1265 | entry = proc_create("handlers", 0, proc_bus_input_dir, |
1266 | &input_handlers_fileops); | |
f96b434d DT |
1267 | if (!entry) |
1268 | goto fail2; | |
1269 | ||
f96b434d DT |
1270 | return 0; |
1271 | ||
1272 | fail2: remove_proc_entry("devices", proc_bus_input_dir); | |
9c37066d | 1273 | fail1: remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1274 | return -ENOMEM; |
1275 | } | |
1276 | ||
beffbdc2 | 1277 | static void input_proc_exit(void) |
f96b434d DT |
1278 | { |
1279 | remove_proc_entry("devices", proc_bus_input_dir); | |
1280 | remove_proc_entry("handlers", proc_bus_input_dir); | |
9c37066d | 1281 | remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1282 | } |
1283 | ||
1284 | #else /* !CONFIG_PROC_FS */ | |
1285 | static inline void input_wakeup_procfs_readers(void) { } | |
1286 | static inline int input_proc_init(void) { return 0; } | |
1287 | static inline void input_proc_exit(void) { } | |
1288 | #endif | |
1289 | ||
9657d75c DT |
1290 | #define INPUT_DEV_STRING_ATTR_SHOW(name) \ |
1291 | static ssize_t input_dev_show_##name(struct device *dev, \ | |
1292 | struct device_attribute *attr, \ | |
1293 | char *buf) \ | |
1294 | { \ | |
1295 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1296 | \ | |
1297 | return scnprintf(buf, PAGE_SIZE, "%s\n", \ | |
1298 | input_dev->name ? input_dev->name : ""); \ | |
1299 | } \ | |
1300 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL) | |
5c1e9a6a DT |
1301 | |
1302 | INPUT_DEV_STRING_ATTR_SHOW(name); | |
1303 | INPUT_DEV_STRING_ATTR_SHOW(phys); | |
1304 | INPUT_DEV_STRING_ATTR_SHOW(uniq); | |
1305 | ||
ac648a6a DT |
1306 | static int input_print_modalias_bits(char *buf, int size, |
1307 | char name, unsigned long *bm, | |
1308 | unsigned int min_bit, unsigned int max_bit) | |
1d8f430c | 1309 | { |
ac648a6a | 1310 | int len = 0, i; |
1d8f430c | 1311 | |
ac648a6a DT |
1312 | len += snprintf(buf, max(size, 0), "%c", name); |
1313 | for (i = min_bit; i < max_bit; i++) | |
7b19ada2 | 1314 | if (bm[BIT_WORD(i)] & BIT_MASK(i)) |
ac648a6a | 1315 | len += snprintf(buf + len, max(size - len, 0), "%X,", i); |
1d8f430c RR |
1316 | return len; |
1317 | } | |
1318 | ||
2db66876 DT |
1319 | static int input_print_modalias(char *buf, int size, struct input_dev *id, |
1320 | int add_cr) | |
1d8f430c | 1321 | { |
bd37e5a9 | 1322 | int len; |
1d8f430c | 1323 | |
ac648a6a DT |
1324 | len = snprintf(buf, max(size, 0), |
1325 | "input:b%04Xv%04Xp%04Xe%04X-", | |
1326 | id->id.bustype, id->id.vendor, | |
1327 | id->id.product, id->id.version); | |
1328 | ||
1329 | len += input_print_modalias_bits(buf + len, size - len, | |
1330 | 'e', id->evbit, 0, EV_MAX); | |
1331 | len += input_print_modalias_bits(buf + len, size - len, | |
1332 | 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); | |
1333 | len += input_print_modalias_bits(buf + len, size - len, | |
1334 | 'r', id->relbit, 0, REL_MAX); | |
1335 | len += input_print_modalias_bits(buf + len, size - len, | |
1336 | 'a', id->absbit, 0, ABS_MAX); | |
1337 | len += input_print_modalias_bits(buf + len, size - len, | |
1338 | 'm', id->mscbit, 0, MSC_MAX); | |
1339 | len += input_print_modalias_bits(buf + len, size - len, | |
1340 | 'l', id->ledbit, 0, LED_MAX); | |
1341 | len += input_print_modalias_bits(buf + len, size - len, | |
1342 | 's', id->sndbit, 0, SND_MAX); | |
1343 | len += input_print_modalias_bits(buf + len, size - len, | |
1344 | 'f', id->ffbit, 0, FF_MAX); | |
1345 | len += input_print_modalias_bits(buf + len, size - len, | |
1346 | 'w', id->swbit, 0, SW_MAX); | |
2db66876 DT |
1347 | |
1348 | if (add_cr) | |
ac648a6a | 1349 | len += snprintf(buf + len, max(size - len, 0), "\n"); |
2db66876 | 1350 | |
bd37e5a9 KS |
1351 | return len; |
1352 | } | |
1353 | ||
9657d75c DT |
1354 | static ssize_t input_dev_show_modalias(struct device *dev, |
1355 | struct device_attribute *attr, | |
1356 | char *buf) | |
bd37e5a9 KS |
1357 | { |
1358 | struct input_dev *id = to_input_dev(dev); | |
1359 | ssize_t len; | |
1360 | ||
2db66876 DT |
1361 | len = input_print_modalias(buf, PAGE_SIZE, id, 1); |
1362 | ||
8a3cf456 | 1363 | return min_t(int, len, PAGE_SIZE); |
1d8f430c | 1364 | } |
9657d75c | 1365 | static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); |
1d8f430c | 1366 | |
85b77200 HR |
1367 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1368 | int max, int add_cr); | |
1369 | ||
1370 | static ssize_t input_dev_show_properties(struct device *dev, | |
1371 | struct device_attribute *attr, | |
1372 | char *buf) | |
1373 | { | |
1374 | struct input_dev *input_dev = to_input_dev(dev); | |
1375 | int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit, | |
1376 | INPUT_PROP_MAX, true); | |
1377 | return min_t(int, len, PAGE_SIZE); | |
1378 | } | |
1379 | static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL); | |
1380 | ||
629b77a4 | 1381 | static struct attribute *input_dev_attrs[] = { |
9657d75c DT |
1382 | &dev_attr_name.attr, |
1383 | &dev_attr_phys.attr, | |
1384 | &dev_attr_uniq.attr, | |
1385 | &dev_attr_modalias.attr, | |
85b77200 | 1386 | &dev_attr_properties.attr, |
629b77a4 GKH |
1387 | NULL |
1388 | }; | |
1389 | ||
bd0ef235 | 1390 | static struct attribute_group input_dev_attr_group = { |
629b77a4 | 1391 | .attrs = input_dev_attrs, |
5c1e9a6a DT |
1392 | }; |
1393 | ||
9657d75c DT |
1394 | #define INPUT_DEV_ID_ATTR(name) \ |
1395 | static ssize_t input_dev_show_id_##name(struct device *dev, \ | |
1396 | struct device_attribute *attr, \ | |
1397 | char *buf) \ | |
1398 | { \ | |
1399 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1400 | return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \ | |
1401 | } \ | |
1402 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL) | |
5c1e9a6a DT |
1403 | |
1404 | INPUT_DEV_ID_ATTR(bustype); | |
1405 | INPUT_DEV_ID_ATTR(vendor); | |
1406 | INPUT_DEV_ID_ATTR(product); | |
1407 | INPUT_DEV_ID_ATTR(version); | |
1408 | ||
1409 | static struct attribute *input_dev_id_attrs[] = { | |
9657d75c DT |
1410 | &dev_attr_bustype.attr, |
1411 | &dev_attr_vendor.attr, | |
1412 | &dev_attr_product.attr, | |
1413 | &dev_attr_version.attr, | |
5c1e9a6a DT |
1414 | NULL |
1415 | }; | |
1416 | ||
1417 | static struct attribute_group input_dev_id_attr_group = { | |
1418 | .name = "id", | |
1419 | .attrs = input_dev_id_attrs, | |
1420 | }; | |
1421 | ||
969b21cd DT |
1422 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1423 | int max, int add_cr) | |
1424 | { | |
1425 | int i; | |
1426 | int len = 0; | |
15e184af DT |
1427 | bool skip_empty = true; |
1428 | ||
1429 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
1430 | len += input_bits_to_string(buf + len, max(buf_size - len, 0), | |
1431 | bitmap[i], skip_empty); | |
1432 | if (len) { | |
1433 | skip_empty = false; | |
1434 | if (i > 0) | |
1435 | len += snprintf(buf + len, max(buf_size - len, 0), " "); | |
1436 | } | |
1437 | } | |
969b21cd | 1438 | |
15e184af DT |
1439 | /* |
1440 | * If no output was produced print a single 0. | |
1441 | */ | |
1442 | if (len == 0) | |
1443 | len = snprintf(buf, buf_size, "%d", 0); | |
969b21cd DT |
1444 | |
1445 | if (add_cr) | |
1446 | len += snprintf(buf + len, max(buf_size - len, 0), "\n"); | |
1447 | ||
1448 | return len; | |
1449 | } | |
1450 | ||
9657d75c DT |
1451 | #define INPUT_DEV_CAP_ATTR(ev, bm) \ |
1452 | static ssize_t input_dev_show_cap_##bm(struct device *dev, \ | |
1453 | struct device_attribute *attr, \ | |
1454 | char *buf) \ | |
1455 | { \ | |
1456 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1457 | int len = input_print_bitmap(buf, PAGE_SIZE, \ | |
15e184af DT |
1458 | input_dev->bm##bit, ev##_MAX, \ |
1459 | true); \ | |
9657d75c DT |
1460 | return min_t(int, len, PAGE_SIZE); \ |
1461 | } \ | |
1462 | static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL) | |
5c1e9a6a DT |
1463 | |
1464 | INPUT_DEV_CAP_ATTR(EV, ev); | |
1465 | INPUT_DEV_CAP_ATTR(KEY, key); | |
1466 | INPUT_DEV_CAP_ATTR(REL, rel); | |
1467 | INPUT_DEV_CAP_ATTR(ABS, abs); | |
1468 | INPUT_DEV_CAP_ATTR(MSC, msc); | |
1469 | INPUT_DEV_CAP_ATTR(LED, led); | |
1470 | INPUT_DEV_CAP_ATTR(SND, snd); | |
1471 | INPUT_DEV_CAP_ATTR(FF, ff); | |
1472 | INPUT_DEV_CAP_ATTR(SW, sw); | |
1473 | ||
1474 | static struct attribute *input_dev_caps_attrs[] = { | |
9657d75c DT |
1475 | &dev_attr_ev.attr, |
1476 | &dev_attr_key.attr, | |
1477 | &dev_attr_rel.attr, | |
1478 | &dev_attr_abs.attr, | |
1479 | &dev_attr_msc.attr, | |
1480 | &dev_attr_led.attr, | |
1481 | &dev_attr_snd.attr, | |
1482 | &dev_attr_ff.attr, | |
1483 | &dev_attr_sw.attr, | |
5c1e9a6a DT |
1484 | NULL |
1485 | }; | |
1486 | ||
1487 | static struct attribute_group input_dev_caps_attr_group = { | |
1488 | .name = "capabilities", | |
1489 | .attrs = input_dev_caps_attrs, | |
1490 | }; | |
1491 | ||
a4dbd674 | 1492 | static const struct attribute_group *input_dev_attr_groups[] = { |
cb9def4d DT |
1493 | &input_dev_attr_group, |
1494 | &input_dev_id_attr_group, | |
1495 | &input_dev_caps_attr_group, | |
1496 | NULL | |
1497 | }; | |
1498 | ||
9657d75c | 1499 | static void input_dev_release(struct device *device) |
d19fbe8a | 1500 | { |
9657d75c | 1501 | struct input_dev *dev = to_input_dev(device); |
d19fbe8a | 1502 | |
509ca1a9 | 1503 | input_ff_destroy(dev); |
40d007e7 | 1504 | input_mt_destroy_slots(dev); |
d31b2865 | 1505 | kfree(dev->absinfo); |
4369c64c | 1506 | kfree(dev->vals); |
d19fbe8a | 1507 | kfree(dev); |
509ca1a9 | 1508 | |
d19fbe8a DT |
1509 | module_put(THIS_MODULE); |
1510 | } | |
1511 | ||
a7fadbe1 | 1512 | /* |
312c004d | 1513 | * Input uevent interface - loading event handlers based on |
a7fadbe1 DT |
1514 | * device bitfields. |
1515 | */ | |
7eff2e7a | 1516 | static int input_add_uevent_bm_var(struct kobj_uevent_env *env, |
ac648a6a | 1517 | const char *name, unsigned long *bitmap, int max) |
a7fadbe1 | 1518 | { |
7eff2e7a | 1519 | int len; |
a7fadbe1 | 1520 | |
fcd3027a | 1521 | if (add_uevent_var(env, "%s", name)) |
a7fadbe1 DT |
1522 | return -ENOMEM; |
1523 | ||
7eff2e7a KS |
1524 | len = input_print_bitmap(&env->buf[env->buflen - 1], |
1525 | sizeof(env->buf) - env->buflen, | |
15e184af | 1526 | bitmap, max, false); |
7eff2e7a | 1527 | if (len >= (sizeof(env->buf) - env->buflen)) |
a7fadbe1 DT |
1528 | return -ENOMEM; |
1529 | ||
7eff2e7a | 1530 | env->buflen += len; |
a7fadbe1 DT |
1531 | return 0; |
1532 | } | |
1533 | ||
7eff2e7a | 1534 | static int input_add_uevent_modalias_var(struct kobj_uevent_env *env, |
ac648a6a DT |
1535 | struct input_dev *dev) |
1536 | { | |
7eff2e7a | 1537 | int len; |
ac648a6a | 1538 | |
7eff2e7a | 1539 | if (add_uevent_var(env, "MODALIAS=")) |
ac648a6a DT |
1540 | return -ENOMEM; |
1541 | ||
7eff2e7a KS |
1542 | len = input_print_modalias(&env->buf[env->buflen - 1], |
1543 | sizeof(env->buf) - env->buflen, | |
1544 | dev, 0); | |
1545 | if (len >= (sizeof(env->buf) - env->buflen)) | |
ac648a6a DT |
1546 | return -ENOMEM; |
1547 | ||
7eff2e7a | 1548 | env->buflen += len; |
ac648a6a DT |
1549 | return 0; |
1550 | } | |
1551 | ||
a7fadbe1 DT |
1552 | #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \ |
1553 | do { \ | |
7eff2e7a | 1554 | int err = add_uevent_var(env, fmt, val); \ |
a7fadbe1 DT |
1555 | if (err) \ |
1556 | return err; \ | |
1557 | } while (0) | |
1558 | ||
1559 | #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \ | |
1560 | do { \ | |
7eff2e7a | 1561 | int err = input_add_uevent_bm_var(env, name, bm, max); \ |
a7fadbe1 DT |
1562 | if (err) \ |
1563 | return err; \ | |
1564 | } while (0) | |
1565 | ||
ac648a6a DT |
1566 | #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \ |
1567 | do { \ | |
7eff2e7a | 1568 | int err = input_add_uevent_modalias_var(env, dev); \ |
ac648a6a DT |
1569 | if (err) \ |
1570 | return err; \ | |
1571 | } while (0) | |
1572 | ||
7eff2e7a | 1573 | static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env) |
a7fadbe1 | 1574 | { |
9657d75c | 1575 | struct input_dev *dev = to_input_dev(device); |
a7fadbe1 DT |
1576 | |
1577 | INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x", | |
1578 | dev->id.bustype, dev->id.vendor, | |
1579 | dev->id.product, dev->id.version); | |
1580 | if (dev->name) | |
1581 | INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); | |
1582 | if (dev->phys) | |
1583 | INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); | |
08de1f04 | 1584 | if (dev->uniq) |
a7fadbe1 DT |
1585 | INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); |
1586 | ||
85b77200 HR |
1587 | INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX); |
1588 | ||
a7fadbe1 DT |
1589 | INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX); |
1590 | if (test_bit(EV_KEY, dev->evbit)) | |
1591 | INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX); | |
1592 | if (test_bit(EV_REL, dev->evbit)) | |
1593 | INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX); | |
1594 | if (test_bit(EV_ABS, dev->evbit)) | |
1595 | INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX); | |
1596 | if (test_bit(EV_MSC, dev->evbit)) | |
1597 | INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX); | |
1598 | if (test_bit(EV_LED, dev->evbit)) | |
1599 | INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX); | |
1600 | if (test_bit(EV_SND, dev->evbit)) | |
1601 | INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX); | |
1602 | if (test_bit(EV_FF, dev->evbit)) | |
1603 | INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX); | |
1604 | if (test_bit(EV_SW, dev->evbit)) | |
1605 | INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); | |
1606 | ||
ac648a6a | 1607 | INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); |
a7fadbe1 DT |
1608 | |
1609 | return 0; | |
1610 | } | |
1611 | ||
3cc96351 DT |
1612 | #define INPUT_DO_TOGGLE(dev, type, bits, on) \ |
1613 | do { \ | |
1614 | int i; \ | |
1615 | bool active; \ | |
1616 | \ | |
1617 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1618 | break; \ | |
1619 | \ | |
1620 | for (i = 0; i < type##_MAX; i++) { \ | |
1621 | if (!test_bit(i, dev->bits##bit)) \ | |
1622 | continue; \ | |
1623 | \ | |
1624 | active = test_bit(i, dev->bits); \ | |
1625 | if (!active && !on) \ | |
1626 | continue; \ | |
1627 | \ | |
1628 | dev->event(dev, EV_##type, i, on ? active : 0); \ | |
1629 | } \ | |
ffd0db97 DT |
1630 | } while (0) |
1631 | ||
b50b5216 | 1632 | static void input_dev_toggle(struct input_dev *dev, bool activate) |
ffd0db97 DT |
1633 | { |
1634 | if (!dev->event) | |
1635 | return; | |
1636 | ||
1637 | INPUT_DO_TOGGLE(dev, LED, led, activate); | |
1638 | INPUT_DO_TOGGLE(dev, SND, snd, activate); | |
1639 | ||
1640 | if (activate && test_bit(EV_REP, dev->evbit)) { | |
1641 | dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]); | |
1642 | dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]); | |
1643 | } | |
1644 | } | |
1645 | ||
b50b5216 DT |
1646 | /** |
1647 | * input_reset_device() - reset/restore the state of input device | |
1648 | * @dev: input device whose state needs to be reset | |
1649 | * | |
1650 | * This function tries to reset the state of an opened input device and | |
1651 | * bring internal state and state if the hardware in sync with each other. | |
1652 | * We mark all keys as released, restore LED state, repeat rate, etc. | |
1653 | */ | |
1654 | void input_reset_device(struct input_dev *dev) | |
1655 | { | |
768d9aa5 | 1656 | unsigned long flags; |
b50b5216 | 1657 | |
768d9aa5 AM |
1658 | mutex_lock(&dev->mutex); |
1659 | spin_lock_irqsave(&dev->event_lock, flags); | |
b50b5216 | 1660 | |
768d9aa5 AM |
1661 | input_dev_toggle(dev, true); |
1662 | input_dev_release_keys(dev); | |
b50b5216 | 1663 | |
768d9aa5 | 1664 | spin_unlock_irqrestore(&dev->event_lock, flags); |
b50b5216 DT |
1665 | mutex_unlock(&dev->mutex); |
1666 | } | |
1667 | EXPORT_SYMBOL(input_reset_device); | |
1668 | ||
768d9aa5 | 1669 | #ifdef CONFIG_PM_SLEEP |
ffd0db97 DT |
1670 | static int input_dev_suspend(struct device *dev) |
1671 | { | |
1672 | struct input_dev *input_dev = to_input_dev(dev); | |
1673 | ||
768d9aa5 | 1674 | spin_lock_irq(&input_dev->event_lock); |
b50b5216 | 1675 | |
768d9aa5 AM |
1676 | /* |
1677 | * Keys that are pressed now are unlikely to be | |
1678 | * still pressed when we resume. | |
1679 | */ | |
1680 | input_dev_release_keys(input_dev); | |
b50b5216 | 1681 | |
768d9aa5 AM |
1682 | /* Turn off LEDs and sounds, if any are active. */ |
1683 | input_dev_toggle(input_dev, false); | |
1684 | ||
1685 | spin_unlock_irq(&input_dev->event_lock); | |
ffd0db97 DT |
1686 | |
1687 | return 0; | |
1688 | } | |
1689 | ||
1690 | static int input_dev_resume(struct device *dev) | |
1691 | { | |
1692 | struct input_dev *input_dev = to_input_dev(dev); | |
1693 | ||
768d9aa5 AM |
1694 | spin_lock_irq(&input_dev->event_lock); |
1695 | ||
1696 | /* Restore state of LEDs and sounds, if any were active. */ | |
1697 | input_dev_toggle(input_dev, true); | |
1698 | ||
1699 | spin_unlock_irq(&input_dev->event_lock); | |
1700 | ||
1701 | return 0; | |
1702 | } | |
1703 | ||
1704 | static int input_dev_freeze(struct device *dev) | |
1705 | { | |
1706 | struct input_dev *input_dev = to_input_dev(dev); | |
1707 | ||
1708 | spin_lock_irq(&input_dev->event_lock); | |
1709 | ||
1710 | /* | |
1711 | * Keys that are pressed now are unlikely to be | |
1712 | * still pressed when we resume. | |
1713 | */ | |
1714 | input_dev_release_keys(input_dev); | |
1715 | ||
1716 | spin_unlock_irq(&input_dev->event_lock); | |
1717 | ||
1718 | return 0; | |
1719 | } | |
1720 | ||
1721 | static int input_dev_poweroff(struct device *dev) | |
1722 | { | |
1723 | struct input_dev *input_dev = to_input_dev(dev); | |
1724 | ||
1725 | spin_lock_irq(&input_dev->event_lock); | |
1726 | ||
1727 | /* Turn off LEDs and sounds, if any are active. */ | |
1728 | input_dev_toggle(input_dev, false); | |
1729 | ||
1730 | spin_unlock_irq(&input_dev->event_lock); | |
ffd0db97 DT |
1731 | |
1732 | return 0; | |
1733 | } | |
1734 | ||
1735 | static const struct dev_pm_ops input_dev_pm_ops = { | |
1736 | .suspend = input_dev_suspend, | |
1737 | .resume = input_dev_resume, | |
768d9aa5 AM |
1738 | .freeze = input_dev_freeze, |
1739 | .poweroff = input_dev_poweroff, | |
ffd0db97 DT |
1740 | .restore = input_dev_resume, |
1741 | }; | |
1742 | #endif /* CONFIG_PM */ | |
1743 | ||
9657d75c DT |
1744 | static struct device_type input_dev_type = { |
1745 | .groups = input_dev_attr_groups, | |
1746 | .release = input_dev_release, | |
1747 | .uevent = input_dev_uevent, | |
768d9aa5 | 1748 | #ifdef CONFIG_PM_SLEEP |
ffd0db97 DT |
1749 | .pm = &input_dev_pm_ops, |
1750 | #endif | |
9657d75c DT |
1751 | }; |
1752 | ||
2c9ede55 | 1753 | static char *input_devnode(struct device *dev, umode_t *mode) |
aa5ed63e KS |
1754 | { |
1755 | return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev)); | |
1756 | } | |
1757 | ||
ea9f240b | 1758 | struct class input_class = { |
9657d75c | 1759 | .name = "input", |
e454cea2 | 1760 | .devnode = input_devnode, |
d19fbe8a | 1761 | }; |
ca56fe07 | 1762 | EXPORT_SYMBOL_GPL(input_class); |
d19fbe8a | 1763 | |
1447190e DT |
1764 | /** |
1765 | * input_allocate_device - allocate memory for new input device | |
1766 | * | |
2be975c6 | 1767 | * Returns prepared struct input_dev or %NULL. |
1447190e DT |
1768 | * |
1769 | * NOTE: Use input_free_device() to free devices that have not been | |
1770 | * registered; input_unregister_device() should be used for already | |
1771 | * registered devices. | |
1772 | */ | |
d19fbe8a DT |
1773 | struct input_dev *input_allocate_device(void) |
1774 | { | |
a60a71b0 | 1775 | static atomic_t input_no = ATOMIC_INIT(0); |
d19fbe8a DT |
1776 | struct input_dev *dev; |
1777 | ||
1778 | dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); | |
1779 | if (dev) { | |
9657d75c DT |
1780 | dev->dev.type = &input_dev_type; |
1781 | dev->dev.class = &input_class; | |
1782 | device_initialize(&dev->dev); | |
f60d2b11 | 1783 | mutex_init(&dev->mutex); |
8006479c | 1784 | spin_lock_init(&dev->event_lock); |
a60a71b0 | 1785 | init_timer(&dev->timer); |
d19fbe8a DT |
1786 | INIT_LIST_HEAD(&dev->h_list); |
1787 | INIT_LIST_HEAD(&dev->node); | |
655816e4 | 1788 | |
a60a71b0 DH |
1789 | dev_set_name(&dev->dev, "input%ld", |
1790 | (unsigned long) atomic_inc_return(&input_no) - 1); | |
1791 | ||
655816e4 | 1792 | __module_get(THIS_MODULE); |
d19fbe8a DT |
1793 | } |
1794 | ||
1795 | return dev; | |
1796 | } | |
ca56fe07 | 1797 | EXPORT_SYMBOL(input_allocate_device); |
d19fbe8a | 1798 | |
2be975c6 DT |
1799 | struct input_devres { |
1800 | struct input_dev *input; | |
1801 | }; | |
1802 | ||
1803 | static int devm_input_device_match(struct device *dev, void *res, void *data) | |
1804 | { | |
1805 | struct input_devres *devres = res; | |
1806 | ||
1807 | return devres->input == data; | |
1808 | } | |
1809 | ||
1810 | static void devm_input_device_release(struct device *dev, void *res) | |
1811 | { | |
1812 | struct input_devres *devres = res; | |
1813 | struct input_dev *input = devres->input; | |
1814 | ||
1815 | dev_dbg(dev, "%s: dropping reference to %s\n", | |
1816 | __func__, dev_name(&input->dev)); | |
1817 | input_put_device(input); | |
1818 | } | |
1819 | ||
1820 | /** | |
1821 | * devm_input_allocate_device - allocate managed input device | |
1822 | * @dev: device owning the input device being created | |
1823 | * | |
1824 | * Returns prepared struct input_dev or %NULL. | |
1825 | * | |
1826 | * Managed input devices do not need to be explicitly unregistered or | |
1827 | * freed as it will be done automatically when owner device unbinds from | |
1828 | * its driver (or binding fails). Once managed input device is allocated, | |
1829 | * it is ready to be set up and registered in the same fashion as regular | |
1830 | * input device. There are no special devm_input_device_[un]register() | |
b666263b DT |
1831 | * variants, regular ones work with both managed and unmanaged devices, |
1832 | * should you need them. In most cases however, managed input device need | |
1833 | * not be explicitly unregistered or freed. | |
2be975c6 DT |
1834 | * |
1835 | * NOTE: the owner device is set up as parent of input device and users | |
1836 | * should not override it. | |
1837 | */ | |
2be975c6 DT |
1838 | struct input_dev *devm_input_allocate_device(struct device *dev) |
1839 | { | |
1840 | struct input_dev *input; | |
1841 | struct input_devres *devres; | |
1842 | ||
1843 | devres = devres_alloc(devm_input_device_release, | |
1844 | sizeof(struct input_devres), GFP_KERNEL); | |
1845 | if (!devres) | |
1846 | return NULL; | |
1847 | ||
1848 | input = input_allocate_device(); | |
1849 | if (!input) { | |
1850 | devres_free(devres); | |
1851 | return NULL; | |
1852 | } | |
1853 | ||
1854 | input->dev.parent = dev; | |
1855 | input->devres_managed = true; | |
1856 | ||
1857 | devres->input = input; | |
1858 | devres_add(dev, devres); | |
1859 | ||
1860 | return input; | |
1861 | } | |
1862 | EXPORT_SYMBOL(devm_input_allocate_device); | |
1863 | ||
1447190e DT |
1864 | /** |
1865 | * input_free_device - free memory occupied by input_dev structure | |
1866 | * @dev: input device to free | |
1867 | * | |
1868 | * This function should only be used if input_register_device() | |
1869 | * was not called yet or if it failed. Once device was registered | |
1870 | * use input_unregister_device() and memory will be freed once last | |
8006479c | 1871 | * reference to the device is dropped. |
1447190e DT |
1872 | * |
1873 | * Device should be allocated by input_allocate_device(). | |
1874 | * | |
1875 | * NOTE: If there are references to the input device then memory | |
1876 | * will not be freed until last reference is dropped. | |
1877 | */ | |
f60d2b11 DT |
1878 | void input_free_device(struct input_dev *dev) |
1879 | { | |
2be975c6 DT |
1880 | if (dev) { |
1881 | if (dev->devres_managed) | |
1882 | WARN_ON(devres_destroy(dev->dev.parent, | |
1883 | devm_input_device_release, | |
1884 | devm_input_device_match, | |
1885 | dev)); | |
f60d2b11 | 1886 | input_put_device(dev); |
2be975c6 | 1887 | } |
f60d2b11 | 1888 | } |
ca56fe07 | 1889 | EXPORT_SYMBOL(input_free_device); |
f60d2b11 | 1890 | |
534565f2 DT |
1891 | /** |
1892 | * input_set_capability - mark device as capable of a certain event | |
1893 | * @dev: device that is capable of emitting or accepting event | |
1894 | * @type: type of the event (EV_KEY, EV_REL, etc...) | |
1895 | * @code: event code | |
1896 | * | |
1897 | * In addition to setting up corresponding bit in appropriate capability | |
1898 | * bitmap the function also adjusts dev->evbit. | |
1899 | */ | |
1900 | void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code) | |
1901 | { | |
1902 | switch (type) { | |
1903 | case EV_KEY: | |
1904 | __set_bit(code, dev->keybit); | |
1905 | break; | |
1906 | ||
1907 | case EV_REL: | |
1908 | __set_bit(code, dev->relbit); | |
1909 | break; | |
1910 | ||
1911 | case EV_ABS: | |
28a2a2e1 DT |
1912 | input_alloc_absinfo(dev); |
1913 | if (!dev->absinfo) | |
1914 | return; | |
1915 | ||
534565f2 DT |
1916 | __set_bit(code, dev->absbit); |
1917 | break; | |
1918 | ||
1919 | case EV_MSC: | |
1920 | __set_bit(code, dev->mscbit); | |
1921 | break; | |
1922 | ||
1923 | case EV_SW: | |
1924 | __set_bit(code, dev->swbit); | |
1925 | break; | |
1926 | ||
1927 | case EV_LED: | |
1928 | __set_bit(code, dev->ledbit); | |
1929 | break; | |
1930 | ||
1931 | case EV_SND: | |
1932 | __set_bit(code, dev->sndbit); | |
1933 | break; | |
1934 | ||
1935 | case EV_FF: | |
1936 | __set_bit(code, dev->ffbit); | |
1937 | break; | |
1938 | ||
22d1c398 DB |
1939 | case EV_PWR: |
1940 | /* do nothing */ | |
1941 | break; | |
1942 | ||
534565f2 | 1943 | default: |
da0c4901 JP |
1944 | pr_err("input_set_capability: unknown type %u (code %u)\n", |
1945 | type, code); | |
534565f2 DT |
1946 | dump_stack(); |
1947 | return; | |
1948 | } | |
1949 | ||
1950 | __set_bit(type, dev->evbit); | |
1951 | } | |
1952 | EXPORT_SYMBOL(input_set_capability); | |
1953 | ||
80b4895a JB |
1954 | static unsigned int input_estimate_events_per_packet(struct input_dev *dev) |
1955 | { | |
1956 | int mt_slots; | |
1957 | int i; | |
1958 | unsigned int events; | |
1959 | ||
8d18fba2 HR |
1960 | if (dev->mt) { |
1961 | mt_slots = dev->mt->num_slots; | |
80b4895a JB |
1962 | } else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit)) { |
1963 | mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum - | |
1964 | dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1, | |
8c127f07 | 1965 | mt_slots = clamp(mt_slots, 2, 32); |
80b4895a JB |
1966 | } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) { |
1967 | mt_slots = 2; | |
1968 | } else { | |
1969 | mt_slots = 0; | |
1970 | } | |
1971 | ||
1972 | events = mt_slots + 1; /* count SYN_MT_REPORT and SYN_REPORT */ | |
1973 | ||
1974 | for (i = 0; i < ABS_CNT; i++) { | |
1975 | if (test_bit(i, dev->absbit)) { | |
1976 | if (input_is_mt_axis(i)) | |
1977 | events += mt_slots; | |
1978 | else | |
1979 | events++; | |
1980 | } | |
1981 | } | |
1982 | ||
1983 | for (i = 0; i < REL_CNT; i++) | |
1984 | if (test_bit(i, dev->relbit)) | |
1985 | events++; | |
1986 | ||
7c75bf99 HR |
1987 | /* Make room for KEY and MSC events */ |
1988 | events += 7; | |
1989 | ||
80b4895a JB |
1990 | return events; |
1991 | } | |
1992 | ||
92a3a587 DT |
1993 | #define INPUT_CLEANSE_BITMASK(dev, type, bits) \ |
1994 | do { \ | |
1995 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1996 | memset(dev->bits##bit, 0, \ | |
1997 | sizeof(dev->bits##bit)); \ | |
1998 | } while (0) | |
1999 | ||
2000 | static void input_cleanse_bitmasks(struct input_dev *dev) | |
2001 | { | |
2002 | INPUT_CLEANSE_BITMASK(dev, KEY, key); | |
2003 | INPUT_CLEANSE_BITMASK(dev, REL, rel); | |
2004 | INPUT_CLEANSE_BITMASK(dev, ABS, abs); | |
2005 | INPUT_CLEANSE_BITMASK(dev, MSC, msc); | |
2006 | INPUT_CLEANSE_BITMASK(dev, LED, led); | |
2007 | INPUT_CLEANSE_BITMASK(dev, SND, snd); | |
2008 | INPUT_CLEANSE_BITMASK(dev, FF, ff); | |
2009 | INPUT_CLEANSE_BITMASK(dev, SW, sw); | |
2010 | } | |
2011 | ||
2be975c6 DT |
2012 | static void __input_unregister_device(struct input_dev *dev) |
2013 | { | |
2014 | struct input_handle *handle, *next; | |
2015 | ||
2016 | input_disconnect_device(dev); | |
2017 | ||
2018 | mutex_lock(&input_mutex); | |
2019 | ||
2020 | list_for_each_entry_safe(handle, next, &dev->h_list, d_node) | |
2021 | handle->handler->disconnect(handle); | |
2022 | WARN_ON(!list_empty(&dev->h_list)); | |
2023 | ||
2024 | del_timer_sync(&dev->timer); | |
2025 | list_del_init(&dev->node); | |
2026 | ||
2027 | input_wakeup_procfs_readers(); | |
2028 | ||
2029 | mutex_unlock(&input_mutex); | |
2030 | ||
2031 | device_del(&dev->dev); | |
2032 | } | |
2033 | ||
2034 | static void devm_input_device_unregister(struct device *dev, void *res) | |
2035 | { | |
2036 | struct input_devres *devres = res; | |
2037 | struct input_dev *input = devres->input; | |
2038 | ||
2039 | dev_dbg(dev, "%s: unregistering device %s\n", | |
2040 | __func__, dev_name(&input->dev)); | |
2041 | __input_unregister_device(input); | |
2042 | } | |
2043 | ||
8006479c DT |
2044 | /** |
2045 | * input_register_device - register device with input core | |
2046 | * @dev: device to be registered | |
2047 | * | |
2048 | * This function registers device with input core. The device must be | |
2049 | * allocated with input_allocate_device() and all it's capabilities | |
2050 | * set up before registering. | |
2051 | * If function fails the device must be freed with input_free_device(). | |
2052 | * Once device has been successfully registered it can be unregistered | |
2053 | * with input_unregister_device(); input_free_device() should not be | |
2054 | * called in this case. | |
b666263b DT |
2055 | * |
2056 | * Note that this function is also used to register managed input devices | |
2057 | * (ones allocated with devm_input_allocate_device()). Such managed input | |
2058 | * devices need not be explicitly unregistered or freed, their tear down | |
2059 | * is controlled by the devres infrastructure. It is also worth noting | |
2060 | * that tear down of managed input devices is internally a 2-step process: | |
2061 | * registered managed input device is first unregistered, but stays in | |
2062 | * memory and can still handle input_event() calls (although events will | |
2063 | * not be delivered anywhere). The freeing of managed input device will | |
2064 | * happen later, when devres stack is unwound to the point where device | |
2065 | * allocation was made. | |
8006479c | 2066 | */ |
5f945489 | 2067 | int input_register_device(struct input_dev *dev) |
1da177e4 | 2068 | { |
2be975c6 | 2069 | struct input_devres *devres = NULL; |
1da177e4 | 2070 | struct input_handler *handler; |
7c75bf99 | 2071 | unsigned int packet_size; |
bd0ef235 DT |
2072 | const char *path; |
2073 | int error; | |
1da177e4 | 2074 | |
2be975c6 DT |
2075 | if (dev->devres_managed) { |
2076 | devres = devres_alloc(devm_input_device_unregister, | |
2077 | sizeof(struct input_devres), GFP_KERNEL); | |
2078 | if (!devres) | |
2079 | return -ENOMEM; | |
2080 | ||
2081 | devres->input = dev; | |
2082 | } | |
2083 | ||
4f93df40 | 2084 | /* Every input device generates EV_SYN/SYN_REPORT events. */ |
8006479c | 2085 | __set_bit(EV_SYN, dev->evbit); |
0fbf87ca | 2086 | |
4f93df40 DT |
2087 | /* KEY_RESERVED is not supposed to be transmitted to userspace. */ |
2088 | __clear_bit(KEY_RESERVED, dev->keybit); | |
2089 | ||
92a3a587 DT |
2090 | /* Make sure that bitmasks not mentioned in dev->evbit are clean. */ |
2091 | input_cleanse_bitmasks(dev); | |
2092 | ||
7c75bf99 HR |
2093 | packet_size = input_estimate_events_per_packet(dev); |
2094 | if (dev->hint_events_per_packet < packet_size) | |
2095 | dev->hint_events_per_packet = packet_size; | |
80b4895a | 2096 | |
95079b8a | 2097 | dev->max_vals = dev->hint_events_per_packet + 2; |
4369c64c | 2098 | dev->vals = kcalloc(dev->max_vals, sizeof(*dev->vals), GFP_KERNEL); |
2be975c6 DT |
2099 | if (!dev->vals) { |
2100 | error = -ENOMEM; | |
2101 | goto err_devres_free; | |
2102 | } | |
80b4895a | 2103 | |
1da177e4 LT |
2104 | /* |
2105 | * If delay and period are pre-set by the driver, then autorepeating | |
2106 | * is handled by the driver itself and we don't do it in input.c. | |
2107 | */ | |
1da177e4 LT |
2108 | if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { |
2109 | dev->timer.data = (long) dev; | |
2110 | dev->timer.function = input_repeat_key; | |
2111 | dev->rep[REP_DELAY] = 250; | |
2112 | dev->rep[REP_PERIOD] = 33; | |
2113 | } | |
2114 | ||
aebd636b DT |
2115 | if (!dev->getkeycode) |
2116 | dev->getkeycode = input_default_getkeycode; | |
c8e4c772 | 2117 | |
aebd636b DT |
2118 | if (!dev->setkeycode) |
2119 | dev->setkeycode = input_default_setkeycode; | |
c8e4c772 | 2120 | |
9657d75c | 2121 | error = device_add(&dev->dev); |
bd0ef235 | 2122 | if (error) |
2be975c6 | 2123 | goto err_free_vals; |
bd0ef235 | 2124 | |
9657d75c | 2125 | path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
da0c4901 JP |
2126 | pr_info("%s as %s\n", |
2127 | dev->name ? dev->name : "Unspecified device", | |
2128 | path ? path : "N/A"); | |
bd0ef235 | 2129 | kfree(path); |
10204020 | 2130 | |
8006479c | 2131 | error = mutex_lock_interruptible(&input_mutex); |
2be975c6 DT |
2132 | if (error) |
2133 | goto err_device_del; | |
8006479c DT |
2134 | |
2135 | list_add_tail(&dev->node, &input_dev_list); | |
2136 | ||
1da177e4 | 2137 | list_for_each_entry(handler, &input_handler_list, node) |
5b2a0826 | 2138 | input_attach_handler(dev, handler); |
1da177e4 | 2139 | |
f96b434d | 2140 | input_wakeup_procfs_readers(); |
5f945489 | 2141 | |
8006479c DT |
2142 | mutex_unlock(&input_mutex); |
2143 | ||
2be975c6 DT |
2144 | if (dev->devres_managed) { |
2145 | dev_dbg(dev->dev.parent, "%s: registering %s with devres.\n", | |
2146 | __func__, dev_name(&dev->dev)); | |
2147 | devres_add(dev->dev.parent, devres); | |
2148 | } | |
5f945489 | 2149 | return 0; |
2be975c6 DT |
2150 | |
2151 | err_device_del: | |
2152 | device_del(&dev->dev); | |
2153 | err_free_vals: | |
2154 | kfree(dev->vals); | |
2155 | dev->vals = NULL; | |
2156 | err_devres_free: | |
2157 | devres_free(devres); | |
2158 | return error; | |
1da177e4 | 2159 | } |
ca56fe07 | 2160 | EXPORT_SYMBOL(input_register_device); |
1da177e4 | 2161 | |
8006479c DT |
2162 | /** |
2163 | * input_unregister_device - unregister previously registered device | |
2164 | * @dev: device to be unregistered | |
2165 | * | |
2166 | * This function unregisters an input device. Once device is unregistered | |
2167 | * the caller should not try to access it as it may get freed at any moment. | |
2168 | */ | |
1da177e4 LT |
2169 | void input_unregister_device(struct input_dev *dev) |
2170 | { | |
2be975c6 DT |
2171 | if (dev->devres_managed) { |
2172 | WARN_ON(devres_destroy(dev->dev.parent, | |
2173 | devm_input_device_unregister, | |
2174 | devm_input_device_match, | |
2175 | dev)); | |
2176 | __input_unregister_device(dev); | |
2177 | /* | |
2178 | * We do not do input_put_device() here because it will be done | |
2179 | * when 2nd devres fires up. | |
2180 | */ | |
2181 | } else { | |
2182 | __input_unregister_device(dev); | |
2183 | input_put_device(dev); | |
2184 | } | |
1da177e4 | 2185 | } |
ca56fe07 | 2186 | EXPORT_SYMBOL(input_unregister_device); |
1da177e4 | 2187 | |
8006479c DT |
2188 | /** |
2189 | * input_register_handler - register a new input handler | |
2190 | * @handler: handler to be registered | |
2191 | * | |
2192 | * This function registers a new input handler (interface) for input | |
2193 | * devices in the system and attaches it to all input devices that | |
2194 | * are compatible with the handler. | |
2195 | */ | |
4263cf0f | 2196 | int input_register_handler(struct input_handler *handler) |
1da177e4 LT |
2197 | { |
2198 | struct input_dev *dev; | |
7f8d4cad | 2199 | int error; |
8006479c | 2200 | |
7f8d4cad DT |
2201 | error = mutex_lock_interruptible(&input_mutex); |
2202 | if (error) | |
2203 | return error; | |
1da177e4 | 2204 | |
1da177e4 LT |
2205 | INIT_LIST_HEAD(&handler->h_list); |
2206 | ||
1da177e4 LT |
2207 | list_add_tail(&handler->node, &input_handler_list); |
2208 | ||
2209 | list_for_each_entry(dev, &input_dev_list, node) | |
5b2a0826 | 2210 | input_attach_handler(dev, handler); |
1da177e4 | 2211 | |
f96b434d | 2212 | input_wakeup_procfs_readers(); |
8006479c | 2213 | |
8006479c | 2214 | mutex_unlock(&input_mutex); |
7f8d4cad | 2215 | return 0; |
1da177e4 | 2216 | } |
ca56fe07 | 2217 | EXPORT_SYMBOL(input_register_handler); |
1da177e4 | 2218 | |
8006479c DT |
2219 | /** |
2220 | * input_unregister_handler - unregisters an input handler | |
2221 | * @handler: handler to be unregistered | |
2222 | * | |
2223 | * This function disconnects a handler from its input devices and | |
2224 | * removes it from lists of known handlers. | |
2225 | */ | |
1da177e4 LT |
2226 | void input_unregister_handler(struct input_handler *handler) |
2227 | { | |
5b2a0826 | 2228 | struct input_handle *handle, *next; |
1da177e4 | 2229 | |
8006479c DT |
2230 | mutex_lock(&input_mutex); |
2231 | ||
5b2a0826 | 2232 | list_for_each_entry_safe(handle, next, &handler->h_list, h_node) |
1da177e4 | 2233 | handler->disconnect(handle); |
5b2a0826 | 2234 | WARN_ON(!list_empty(&handler->h_list)); |
1da177e4 LT |
2235 | |
2236 | list_del_init(&handler->node); | |
2237 | ||
f96b434d | 2238 | input_wakeup_procfs_readers(); |
8006479c DT |
2239 | |
2240 | mutex_unlock(&input_mutex); | |
1da177e4 | 2241 | } |
ca56fe07 | 2242 | EXPORT_SYMBOL(input_unregister_handler); |
1da177e4 | 2243 | |
66d2a595 DT |
2244 | /** |
2245 | * input_handler_for_each_handle - handle iterator | |
2246 | * @handler: input handler to iterate | |
2247 | * @data: data for the callback | |
2248 | * @fn: function to be called for each handle | |
2249 | * | |
2250 | * Iterate over @bus's list of devices, and call @fn for each, passing | |
2251 | * it @data and stop when @fn returns a non-zero value. The function is | |
2252 | * using RCU to traverse the list and therefore may be usind in atonic | |
2253 | * contexts. The @fn callback is invoked from RCU critical section and | |
2254 | * thus must not sleep. | |
2255 | */ | |
2256 | int input_handler_for_each_handle(struct input_handler *handler, void *data, | |
2257 | int (*fn)(struct input_handle *, void *)) | |
2258 | { | |
2259 | struct input_handle *handle; | |
2260 | int retval = 0; | |
2261 | ||
2262 | rcu_read_lock(); | |
2263 | ||
2264 | list_for_each_entry_rcu(handle, &handler->h_list, h_node) { | |
2265 | retval = fn(handle, data); | |
2266 | if (retval) | |
2267 | break; | |
2268 | } | |
2269 | ||
2270 | rcu_read_unlock(); | |
2271 | ||
2272 | return retval; | |
2273 | } | |
2274 | EXPORT_SYMBOL(input_handler_for_each_handle); | |
2275 | ||
8006479c DT |
2276 | /** |
2277 | * input_register_handle - register a new input handle | |
2278 | * @handle: handle to register | |
2279 | * | |
2280 | * This function puts a new input handle onto device's | |
2281 | * and handler's lists so that events can flow through | |
2282 | * it once it is opened using input_open_device(). | |
2283 | * | |
2284 | * This function is supposed to be called from handler's | |
2285 | * connect() method. | |
2286 | */ | |
5b2a0826 DT |
2287 | int input_register_handle(struct input_handle *handle) |
2288 | { | |
2289 | struct input_handler *handler = handle->handler; | |
8006479c DT |
2290 | struct input_dev *dev = handle->dev; |
2291 | int error; | |
2292 | ||
2293 | /* | |
2294 | * We take dev->mutex here to prevent race with | |
2295 | * input_release_device(). | |
2296 | */ | |
2297 | error = mutex_lock_interruptible(&dev->mutex); | |
2298 | if (error) | |
2299 | return error; | |
ef7995f4 DT |
2300 | |
2301 | /* | |
2302 | * Filters go to the head of the list, normal handlers | |
2303 | * to the tail. | |
2304 | */ | |
2305 | if (handler->filter) | |
2306 | list_add_rcu(&handle->d_node, &dev->h_list); | |
2307 | else | |
2308 | list_add_tail_rcu(&handle->d_node, &dev->h_list); | |
2309 | ||
8006479c | 2310 | mutex_unlock(&dev->mutex); |
5b2a0826 | 2311 | |
8006479c DT |
2312 | /* |
2313 | * Since we are supposed to be called from ->connect() | |
2314 | * which is mutually exclusive with ->disconnect() | |
2315 | * we can't be racing with input_unregister_handle() | |
2316 | * and so separate lock is not needed here. | |
2317 | */ | |
66d2a595 | 2318 | list_add_tail_rcu(&handle->h_node, &handler->h_list); |
5b2a0826 DT |
2319 | |
2320 | if (handler->start) | |
2321 | handler->start(handle); | |
2322 | ||
2323 | return 0; | |
2324 | } | |
2325 | EXPORT_SYMBOL(input_register_handle); | |
2326 | ||
8006479c DT |
2327 | /** |
2328 | * input_unregister_handle - unregister an input handle | |
2329 | * @handle: handle to unregister | |
2330 | * | |
2331 | * This function removes input handle from device's | |
2332 | * and handler's lists. | |
2333 | * | |
2334 | * This function is supposed to be called from handler's | |
2335 | * disconnect() method. | |
2336 | */ | |
5b2a0826 DT |
2337 | void input_unregister_handle(struct input_handle *handle) |
2338 | { | |
8006479c DT |
2339 | struct input_dev *dev = handle->dev; |
2340 | ||
66d2a595 | 2341 | list_del_rcu(&handle->h_node); |
8006479c DT |
2342 | |
2343 | /* | |
2344 | * Take dev->mutex to prevent race with input_release_device(). | |
2345 | */ | |
2346 | mutex_lock(&dev->mutex); | |
2347 | list_del_rcu(&handle->d_node); | |
2348 | mutex_unlock(&dev->mutex); | |
66d2a595 | 2349 | |
82ba56c2 | 2350 | synchronize_rcu(); |
5b2a0826 DT |
2351 | } |
2352 | EXPORT_SYMBOL(input_unregister_handle); | |
2353 | ||
7f8d4cad DT |
2354 | /** |
2355 | * input_get_new_minor - allocates a new input minor number | |
2356 | * @legacy_base: beginning or the legacy range to be searched | |
2357 | * @legacy_num: size of legacy range | |
2358 | * @allow_dynamic: whether we can also take ID from the dynamic range | |
2359 | * | |
2360 | * This function allocates a new device minor for from input major namespace. | |
2361 | * Caller can request legacy minor by specifying @legacy_base and @legacy_num | |
2362 | * parameters and whether ID can be allocated from dynamic range if there are | |
2363 | * no free IDs in legacy range. | |
2364 | */ | |
2365 | int input_get_new_minor(int legacy_base, unsigned int legacy_num, | |
2366 | bool allow_dynamic) | |
1da177e4 | 2367 | { |
1da177e4 | 2368 | /* |
7f8d4cad DT |
2369 | * This function should be called from input handler's ->connect() |
2370 | * methods, which are serialized with input_mutex, so no additional | |
2371 | * locking is needed here. | |
1da177e4 | 2372 | */ |
7f8d4cad DT |
2373 | if (legacy_base >= 0) { |
2374 | int minor = ida_simple_get(&input_ida, | |
2375 | legacy_base, | |
2376 | legacy_base + legacy_num, | |
2377 | GFP_KERNEL); | |
2378 | if (minor >= 0 || !allow_dynamic) | |
2379 | return minor; | |
1da177e4 | 2380 | } |
2f2177c8 | 2381 | |
7f8d4cad DT |
2382 | return ida_simple_get(&input_ida, |
2383 | INPUT_FIRST_DYNAMIC_DEV, INPUT_MAX_CHAR_DEVICES, | |
2384 | GFP_KERNEL); | |
1da177e4 | 2385 | } |
7f8d4cad | 2386 | EXPORT_SYMBOL(input_get_new_minor); |
1da177e4 | 2387 | |
7f8d4cad DT |
2388 | /** |
2389 | * input_free_minor - release previously allocated minor | |
2390 | * @minor: minor to be released | |
2391 | * | |
2392 | * This function releases previously allocated input minor so that it can be | |
2393 | * reused later. | |
2394 | */ | |
2395 | void input_free_minor(unsigned int minor) | |
2396 | { | |
2397 | ida_simple_remove(&input_ida, minor); | |
2398 | } | |
2399 | EXPORT_SYMBOL(input_free_minor); | |
1da177e4 | 2400 | |
f96b434d | 2401 | static int __init input_init(void) |
1da177e4 | 2402 | { |
f96b434d | 2403 | int err; |
1da177e4 | 2404 | |
ea9f240b | 2405 | err = class_register(&input_class); |
d19fbe8a | 2406 | if (err) { |
da0c4901 | 2407 | pr_err("unable to register input_dev class\n"); |
d19fbe8a DT |
2408 | return err; |
2409 | } | |
2410 | ||
f96b434d DT |
2411 | err = input_proc_init(); |
2412 | if (err) | |
b0fdfebb | 2413 | goto fail1; |
1da177e4 | 2414 | |
7f8d4cad DT |
2415 | err = register_chrdev_region(MKDEV(INPUT_MAJOR, 0), |
2416 | INPUT_MAX_CHAR_DEVICES, "input"); | |
f96b434d | 2417 | if (err) { |
da0c4901 | 2418 | pr_err("unable to register char major %d", INPUT_MAJOR); |
b0fdfebb | 2419 | goto fail2; |
1da177e4 | 2420 | } |
e334016f | 2421 | |
1da177e4 | 2422 | return 0; |
1da177e4 | 2423 | |
b0fdfebb | 2424 | fail2: input_proc_exit(); |
ea9f240b | 2425 | fail1: class_unregister(&input_class); |
f96b434d | 2426 | return err; |
1da177e4 LT |
2427 | } |
2428 | ||
2429 | static void __exit input_exit(void) | |
2430 | { | |
f96b434d | 2431 | input_proc_exit(); |
7f8d4cad DT |
2432 | unregister_chrdev_region(MKDEV(INPUT_MAJOR, 0), |
2433 | INPUT_MAX_CHAR_DEVICES); | |
ea9f240b | 2434 | class_unregister(&input_class); |
1da177e4 LT |
2435 | } |
2436 | ||
2437 | subsys_initcall(input_init); | |
2438 | module_exit(input_exit); |