Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * The input core | |
3 | * | |
4 | * Copyright (c) 1999-2002 Vojtech Pavlik | |
5 | */ | |
6 | ||
7 | /* | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License version 2 as published by | |
10 | * the Free Software Foundation. | |
11 | */ | |
12 | ||
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 | |
2c50ad34 AG |
103 | if (handler->filter) { |
104 | for (v = vals; v != vals + count; v++) { | |
105 | if (handler->filter(handle, v->type, v->code, v->value)) | |
106 | continue; | |
107 | if (end != v) | |
108 | *end = *v; | |
109 | end++; | |
110 | } | |
111 | count = end - vals; | |
4369c64c | 112 | } |
1da177e4 | 113 | |
4369c64c HR |
114 | if (!count) |
115 | return 0; | |
ef7995f4 | 116 | |
4369c64c HR |
117 | if (handler->events) |
118 | handler->events(handle, vals, count); | |
119 | else if (handler->event) | |
2c50ad34 | 120 | for (v = vals; v != vals + count; v++) |
4369c64c | 121 | handler->event(handle, v->type, v->code, v->value); |
ef7995f4 | 122 | |
4369c64c HR |
123 | return count; |
124 | } | |
ef7995f4 | 125 | |
4369c64c HR |
126 | /* |
127 | * Pass values first through all filters and then, if event has not been | |
128 | * filtered out, through all open handles. This function is called with | |
129 | * dev->event_lock held and interrupts disabled. | |
130 | */ | |
131 | static void input_pass_values(struct input_dev *dev, | |
132 | struct input_value *vals, unsigned int count) | |
8006479c | 133 | { |
82ba56c2 | 134 | struct input_handle *handle; |
4369c64c | 135 | struct input_value *v; |
ef7995f4 | 136 | |
4369c64c HR |
137 | if (!count) |
138 | return; | |
82ba56c2 DT |
139 | |
140 | rcu_read_lock(); | |
1da177e4 | 141 | |
82ba56c2 | 142 | handle = rcu_dereference(dev->grab); |
4369c64c HR |
143 | if (handle) { |
144 | count = input_to_handler(handle, vals, count); | |
145 | } else { | |
146 | list_for_each_entry_rcu(handle, &dev->h_list, d_node) | |
2c50ad34 | 147 | if (handle->open) { |
4369c64c | 148 | count = input_to_handler(handle, vals, count); |
2c50ad34 AG |
149 | if (!count) |
150 | break; | |
151 | } | |
ef7995f4 | 152 | } |
ef7995f4 | 153 | |
82ba56c2 | 154 | rcu_read_unlock(); |
ef7995f4 | 155 | |
4369c64c | 156 | add_input_randomness(vals->type, vals->code, vals->value); |
ef7995f4 | 157 | |
352ac4bd | 158 | /* trigger auto repeat for key events */ |
5ab17145 AG |
159 | if (test_bit(EV_REP, dev->evbit) && test_bit(EV_KEY, dev->evbit)) { |
160 | for (v = vals; v != vals + count; v++) { | |
161 | if (v->type == EV_KEY && v->value != 2) { | |
162 | if (v->value) | |
163 | input_start_autorepeat(dev, v->code); | |
164 | else | |
165 | input_stop_autorepeat(dev); | |
166 | } | |
ef7995f4 DT |
167 | } |
168 | } | |
4369c64c | 169 | } |
ef7995f4 | 170 | |
4369c64c HR |
171 | static void input_pass_event(struct input_dev *dev, |
172 | unsigned int type, unsigned int code, int value) | |
173 | { | |
174 | struct input_value vals[] = { { type, code, value } }; | |
175 | ||
176 | input_pass_values(dev, vals, ARRAY_SIZE(vals)); | |
8006479c | 177 | } |
1da177e4 | 178 | |
8006479c DT |
179 | /* |
180 | * Generate software autorepeat event. Note that we take | |
181 | * dev->event_lock here to avoid racing with input_event | |
182 | * which may cause keys get "stuck". | |
183 | */ | |
184 | static void input_repeat_key(unsigned long data) | |
185 | { | |
186 | struct input_dev *dev = (void *) data; | |
187 | unsigned long flags; | |
1da177e4 | 188 | |
8006479c | 189 | spin_lock_irqsave(&dev->event_lock, flags); |
1da177e4 | 190 | |
8006479c DT |
191 | if (test_bit(dev->repeat_key, dev->key) && |
192 | is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) { | |
4369c64c HR |
193 | struct input_value vals[] = { |
194 | { EV_KEY, dev->repeat_key, 2 }, | |
195 | input_value_sync | |
196 | }; | |
1da177e4 | 197 | |
4369c64c | 198 | input_pass_values(dev, vals, ARRAY_SIZE(vals)); |
31581066 | 199 | |
8006479c DT |
200 | if (dev->rep[REP_PERIOD]) |
201 | mod_timer(&dev->timer, jiffies + | |
202 | msecs_to_jiffies(dev->rep[REP_PERIOD])); | |
203 | } | |
31581066 | 204 | |
8006479c DT |
205 | spin_unlock_irqrestore(&dev->event_lock, flags); |
206 | } | |
31581066 | 207 | |
8006479c DT |
208 | #define INPUT_IGNORE_EVENT 0 |
209 | #define INPUT_PASS_TO_HANDLERS 1 | |
210 | #define INPUT_PASS_TO_DEVICE 2 | |
4369c64c HR |
211 | #define INPUT_SLOT 4 |
212 | #define INPUT_FLUSH 8 | |
8006479c | 213 | #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE) |
1da177e4 | 214 | |
40d007e7 HR |
215 | static int input_handle_abs_event(struct input_dev *dev, |
216 | unsigned int code, int *pval) | |
217 | { | |
8d18fba2 | 218 | struct input_mt *mt = dev->mt; |
40d007e7 HR |
219 | bool is_mt_event; |
220 | int *pold; | |
221 | ||
222 | if (code == ABS_MT_SLOT) { | |
223 | /* | |
224 | * "Stage" the event; we'll flush it later, when we | |
144c0f88 | 225 | * get actual touch data. |
40d007e7 | 226 | */ |
8d18fba2 HR |
227 | if (mt && *pval >= 0 && *pval < mt->num_slots) |
228 | mt->slot = *pval; | |
40d007e7 HR |
229 | |
230 | return INPUT_IGNORE_EVENT; | |
231 | } | |
232 | ||
b89529a1 | 233 | is_mt_event = input_is_mt_value(code); |
40d007e7 HR |
234 | |
235 | if (!is_mt_event) { | |
d31b2865 | 236 | pold = &dev->absinfo[code].value; |
8d18fba2 HR |
237 | } else if (mt) { |
238 | pold = &mt->slots[mt->slot].abs[code - ABS_MT_FIRST]; | |
40d007e7 HR |
239 | } else { |
240 | /* | |
144c0f88 | 241 | * Bypass filtering for multi-touch events when |
40d007e7 HR |
242 | * not employing slots. |
243 | */ | |
244 | pold = NULL; | |
245 | } | |
246 | ||
247 | if (pold) { | |
248 | *pval = input_defuzz_abs_event(*pval, *pold, | |
d31b2865 | 249 | dev->absinfo[code].fuzz); |
40d007e7 HR |
250 | if (*pold == *pval) |
251 | return INPUT_IGNORE_EVENT; | |
252 | ||
253 | *pold = *pval; | |
254 | } | |
255 | ||
256 | /* Flush pending "slot" event */ | |
8d18fba2 HR |
257 | if (is_mt_event && mt && mt->slot != input_abs_get_val(dev, ABS_MT_SLOT)) { |
258 | input_abs_set_val(dev, ABS_MT_SLOT, mt->slot); | |
4369c64c | 259 | return INPUT_PASS_TO_HANDLERS | INPUT_SLOT; |
40d007e7 HR |
260 | } |
261 | ||
262 | return INPUT_PASS_TO_HANDLERS; | |
263 | } | |
264 | ||
4369c64c | 265 | static int input_get_disposition(struct input_dev *dev, |
50c5d36d | 266 | unsigned int type, unsigned int code, int *pval) |
8006479c DT |
267 | { |
268 | int disposition = INPUT_IGNORE_EVENT; | |
50c5d36d | 269 | int value = *pval; |
1da177e4 | 270 | |
8006479c | 271 | switch (type) { |
1da177e4 | 272 | |
8006479c DT |
273 | case EV_SYN: |
274 | switch (code) { | |
275 | case SYN_CONFIG: | |
276 | disposition = INPUT_PASS_TO_ALL; | |
277 | break; | |
1da177e4 | 278 | |
8006479c | 279 | case SYN_REPORT: |
4369c64c | 280 | disposition = INPUT_PASS_TO_HANDLERS | INPUT_FLUSH; |
1da177e4 | 281 | break; |
5e5ee686 | 282 | case SYN_MT_REPORT: |
5e5ee686 HR |
283 | disposition = INPUT_PASS_TO_HANDLERS; |
284 | break; | |
8006479c DT |
285 | } |
286 | break; | |
1da177e4 | 287 | |
8006479c | 288 | case EV_KEY: |
0672120a | 289 | if (is_event_supported(code, dev->keybit, KEY_MAX)) { |
1da177e4 | 290 | |
0672120a HR |
291 | /* auto-repeat bypasses state updates */ |
292 | if (value == 2) { | |
293 | disposition = INPUT_PASS_TO_HANDLERS; | |
294 | break; | |
8006479c | 295 | } |
1da177e4 | 296 | |
0672120a | 297 | if (!!test_bit(code, dev->key) != !!value) { |
1da177e4 | 298 | |
8006479c | 299 | __change_bit(code, dev->key); |
0672120a | 300 | disposition = INPUT_PASS_TO_HANDLERS; |
8006479c | 301 | } |
8006479c DT |
302 | } |
303 | break; | |
1da177e4 | 304 | |
8006479c DT |
305 | case EV_SW: |
306 | if (is_event_supported(code, dev->swbit, SW_MAX) && | |
0672120a | 307 | !!test_bit(code, dev->sw) != !!value) { |
1da177e4 | 308 | |
8006479c DT |
309 | __change_bit(code, dev->sw); |
310 | disposition = INPUT_PASS_TO_HANDLERS; | |
311 | } | |
312 | break; | |
1da177e4 | 313 | |
8006479c | 314 | case EV_ABS: |
40d007e7 | 315 | if (is_event_supported(code, dev->absbit, ABS_MAX)) |
9ae4345a | 316 | disposition = input_handle_abs_event(dev, code, &value); |
61994a61 | 317 | |
8006479c | 318 | break; |
1da177e4 | 319 | |
8006479c DT |
320 | case EV_REL: |
321 | if (is_event_supported(code, dev->relbit, REL_MAX) && value) | |
322 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 323 | |
8006479c | 324 | break; |
1e0afb28 | 325 | |
8006479c DT |
326 | case EV_MSC: |
327 | if (is_event_supported(code, dev->mscbit, MSC_MAX)) | |
328 | disposition = INPUT_PASS_TO_ALL; | |
1da177e4 | 329 | |
8006479c | 330 | break; |
1da177e4 | 331 | |
8006479c DT |
332 | case EV_LED: |
333 | if (is_event_supported(code, dev->ledbit, LED_MAX) && | |
0672120a | 334 | !!test_bit(code, dev->led) != !!value) { |
1da177e4 | 335 | |
8006479c DT |
336 | __change_bit(code, dev->led); |
337 | disposition = INPUT_PASS_TO_ALL; | |
338 | } | |
339 | break; | |
340 | ||
341 | case EV_SND: | |
342 | if (is_event_supported(code, dev->sndbit, SND_MAX)) { | |
1da177e4 | 343 | |
8fdc1948 | 344 | if (!!test_bit(code, dev->snd) != !!value) |
8006479c DT |
345 | __change_bit(code, dev->snd); |
346 | disposition = INPUT_PASS_TO_ALL; | |
347 | } | |
348 | break; | |
8fdc1948 | 349 | |
8006479c DT |
350 | case EV_REP: |
351 | if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) { | |
352 | dev->rep[code] = value; | |
353 | disposition = INPUT_PASS_TO_ALL; | |
354 | } | |
355 | break; | |
1da177e4 | 356 | |
8006479c DT |
357 | case EV_FF: |
358 | if (value >= 0) | |
359 | disposition = INPUT_PASS_TO_ALL; | |
360 | break; | |
ed2fa4dd RP |
361 | |
362 | case EV_PWR: | |
363 | disposition = INPUT_PASS_TO_ALL; | |
364 | break; | |
8006479c | 365 | } |
1da177e4 | 366 | |
50c5d36d | 367 | *pval = value; |
4369c64c HR |
368 | return disposition; |
369 | } | |
370 | ||
371 | static void input_handle_event(struct input_dev *dev, | |
372 | unsigned int type, unsigned int code, int value) | |
373 | { | |
374 | int disposition; | |
375 | ||
50c5d36d | 376 | disposition = input_get_disposition(dev, type, code, &value); |
1da177e4 | 377 | |
8006479c DT |
378 | if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event) |
379 | dev->event(dev, type, code, value); | |
1da177e4 | 380 | |
4369c64c HR |
381 | if (!dev->vals) |
382 | return; | |
383 | ||
384 | if (disposition & INPUT_PASS_TO_HANDLERS) { | |
385 | struct input_value *v; | |
386 | ||
387 | if (disposition & INPUT_SLOT) { | |
388 | v = &dev->vals[dev->num_vals++]; | |
389 | v->type = EV_ABS; | |
390 | v->code = ABS_MT_SLOT; | |
391 | v->value = dev->mt->slot; | |
392 | } | |
393 | ||
394 | v = &dev->vals[dev->num_vals++]; | |
395 | v->type = type; | |
396 | v->code = code; | |
397 | v->value = value; | |
398 | } | |
399 | ||
400 | if (disposition & INPUT_FLUSH) { | |
401 | if (dev->num_vals >= 2) | |
402 | input_pass_values(dev, dev->vals, dev->num_vals); | |
403 | dev->num_vals = 0; | |
404 | } else if (dev->num_vals >= dev->max_vals - 2) { | |
405 | dev->vals[dev->num_vals++] = input_value_sync; | |
406 | input_pass_values(dev, dev->vals, dev->num_vals); | |
407 | dev->num_vals = 0; | |
408 | } | |
409 | ||
8006479c | 410 | } |
1da177e4 | 411 | |
8006479c DT |
412 | /** |
413 | * input_event() - report new input event | |
414 | * @dev: device that generated the event | |
415 | * @type: type of the event | |
416 | * @code: event code | |
417 | * @value: value of the event | |
418 | * | |
419 | * This function should be used by drivers implementing various input | |
df2d4637 DT |
420 | * devices to report input events. See also input_inject_event(). |
421 | * | |
422 | * NOTE: input_event() may be safely used right after input device was | |
423 | * allocated with input_allocate_device(), even before it is registered | |
424 | * with input_register_device(), but the event will not reach any of the | |
425 | * input handlers. Such early invocation of input_event() may be used | |
426 | * to 'seed' initial state of a switch or initial position of absolute | |
427 | * axis, etc. | |
8006479c | 428 | */ |
8006479c DT |
429 | void input_event(struct input_dev *dev, |
430 | unsigned int type, unsigned int code, int value) | |
431 | { | |
432 | unsigned long flags; | |
509ca1a9 | 433 | |
8006479c | 434 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
509ca1a9 | 435 | |
8006479c | 436 | spin_lock_irqsave(&dev->event_lock, flags); |
9ae4345a | 437 | input_handle_event(dev, type, code, value); |
8006479c | 438 | spin_unlock_irqrestore(&dev->event_lock, flags); |
1da177e4 | 439 | } |
1da177e4 | 440 | } |
ca56fe07 | 441 | EXPORT_SYMBOL(input_event); |
1da177e4 | 442 | |
0e739d28 DT |
443 | /** |
444 | * input_inject_event() - send input event from input handler | |
445 | * @handle: input handle to send event through | |
446 | * @type: type of the event | |
447 | * @code: event code | |
448 | * @value: value of the event | |
449 | * | |
8006479c DT |
450 | * Similar to input_event() but will ignore event if device is |
451 | * "grabbed" and handle injecting event is not the one that owns | |
452 | * the device. | |
0e739d28 | 453 | */ |
8006479c DT |
454 | void input_inject_event(struct input_handle *handle, |
455 | unsigned int type, unsigned int code, int value) | |
1da177e4 | 456 | { |
8006479c DT |
457 | struct input_dev *dev = handle->dev; |
458 | struct input_handle *grab; | |
459 | unsigned long flags; | |
1da177e4 | 460 | |
8006479c DT |
461 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
462 | spin_lock_irqsave(&dev->event_lock, flags); | |
1da177e4 | 463 | |
82ba56c2 | 464 | rcu_read_lock(); |
8006479c DT |
465 | grab = rcu_dereference(dev->grab); |
466 | if (!grab || grab == handle) | |
9ae4345a | 467 | input_handle_event(dev, type, code, value); |
82ba56c2 | 468 | rcu_read_unlock(); |
1da177e4 | 469 | |
8006479c DT |
470 | spin_unlock_irqrestore(&dev->event_lock, flags); |
471 | } | |
1da177e4 | 472 | } |
8006479c | 473 | EXPORT_SYMBOL(input_inject_event); |
1da177e4 | 474 | |
d31b2865 DM |
475 | /** |
476 | * input_alloc_absinfo - allocates array of input_absinfo structs | |
477 | * @dev: the input device emitting absolute events | |
478 | * | |
479 | * If the absinfo struct the caller asked for is already allocated, this | |
480 | * functions will not do anything. | |
481 | */ | |
482 | void input_alloc_absinfo(struct input_dev *dev) | |
483 | { | |
484 | if (!dev->absinfo) | |
485 | dev->absinfo = kcalloc(ABS_CNT, sizeof(struct input_absinfo), | |
486 | GFP_KERNEL); | |
487 | ||
488 | WARN(!dev->absinfo, "%s(): kcalloc() failed?\n", __func__); | |
489 | } | |
490 | EXPORT_SYMBOL(input_alloc_absinfo); | |
491 | ||
492 | void input_set_abs_params(struct input_dev *dev, unsigned int axis, | |
493 | int min, int max, int fuzz, int flat) | |
494 | { | |
495 | struct input_absinfo *absinfo; | |
496 | ||
497 | input_alloc_absinfo(dev); | |
498 | if (!dev->absinfo) | |
499 | return; | |
500 | ||
501 | absinfo = &dev->absinfo[axis]; | |
502 | absinfo->minimum = min; | |
503 | absinfo->maximum = max; | |
504 | absinfo->fuzz = fuzz; | |
505 | absinfo->flat = flat; | |
506 | ||
2c9a9cfe DT |
507 | __set_bit(EV_ABS, dev->evbit); |
508 | __set_bit(axis, dev->absbit); | |
d31b2865 DM |
509 | } |
510 | EXPORT_SYMBOL(input_set_abs_params); | |
511 | ||
512 | ||
8006479c DT |
513 | /** |
514 | * input_grab_device - grabs device for exclusive use | |
515 | * @handle: input handle that wants to own the device | |
516 | * | |
517 | * When a device is grabbed by an input handle all events generated by | |
518 | * the device are delivered only to this handle. Also events injected | |
519 | * by other input handles are ignored while device is grabbed. | |
520 | */ | |
1da177e4 LT |
521 | int input_grab_device(struct input_handle *handle) |
522 | { | |
8006479c DT |
523 | struct input_dev *dev = handle->dev; |
524 | int retval; | |
1da177e4 | 525 | |
8006479c DT |
526 | retval = mutex_lock_interruptible(&dev->mutex); |
527 | if (retval) | |
528 | return retval; | |
529 | ||
530 | if (dev->grab) { | |
531 | retval = -EBUSY; | |
532 | goto out; | |
533 | } | |
534 | ||
535 | rcu_assign_pointer(dev->grab, handle); | |
8006479c DT |
536 | |
537 | out: | |
538 | mutex_unlock(&dev->mutex); | |
539 | return retval; | |
1da177e4 | 540 | } |
ca56fe07 | 541 | EXPORT_SYMBOL(input_grab_device); |
1da177e4 | 542 | |
8006479c | 543 | static void __input_release_device(struct input_handle *handle) |
1da177e4 | 544 | { |
a2b2ed2c | 545 | struct input_dev *dev = handle->dev; |
adc4633c | 546 | struct input_handle *grabber; |
c7e8dc6e | 547 | |
adc4633c DT |
548 | grabber = rcu_dereference_protected(dev->grab, |
549 | lockdep_is_held(&dev->mutex)); | |
550 | if (grabber == handle) { | |
8006479c DT |
551 | rcu_assign_pointer(dev->grab, NULL); |
552 | /* Make sure input_pass_event() notices that grab is gone */ | |
82ba56c2 | 553 | synchronize_rcu(); |
a2b2ed2c AM |
554 | |
555 | list_for_each_entry(handle, &dev->h_list, d_node) | |
8006479c | 556 | if (handle->open && handle->handler->start) |
c7e8dc6e DT |
557 | handle->handler->start(handle); |
558 | } | |
1da177e4 | 559 | } |
8006479c DT |
560 | |
561 | /** | |
562 | * input_release_device - release previously grabbed device | |
563 | * @handle: input handle that owns the device | |
564 | * | |
565 | * Releases previously grabbed device so that other input handles can | |
566 | * start receiving input events. Upon release all handlers attached | |
567 | * to the device have their start() method called so they have a change | |
568 | * to synchronize device state with the rest of the system. | |
569 | */ | |
570 | void input_release_device(struct input_handle *handle) | |
571 | { | |
572 | struct input_dev *dev = handle->dev; | |
573 | ||
574 | mutex_lock(&dev->mutex); | |
575 | __input_release_device(handle); | |
576 | mutex_unlock(&dev->mutex); | |
577 | } | |
ca56fe07 | 578 | EXPORT_SYMBOL(input_release_device); |
1da177e4 | 579 | |
8006479c DT |
580 | /** |
581 | * input_open_device - open input device | |
582 | * @handle: handle through which device is being accessed | |
583 | * | |
584 | * This function should be called by input handlers when they | |
585 | * want to start receive events from given input device. | |
586 | */ | |
1da177e4 LT |
587 | int input_open_device(struct input_handle *handle) |
588 | { | |
0fbf87ca | 589 | struct input_dev *dev = handle->dev; |
8006479c | 590 | int retval; |
0fbf87ca | 591 | |
8006479c DT |
592 | retval = mutex_lock_interruptible(&dev->mutex); |
593 | if (retval) | |
594 | return retval; | |
595 | ||
596 | if (dev->going_away) { | |
597 | retval = -ENODEV; | |
598 | goto out; | |
599 | } | |
0fbf87ca | 600 | |
1da177e4 | 601 | handle->open++; |
0fbf87ca DT |
602 | |
603 | if (!dev->users++ && dev->open) | |
8006479c DT |
604 | retval = dev->open(dev); |
605 | ||
606 | if (retval) { | |
607 | dev->users--; | |
608 | if (!--handle->open) { | |
609 | /* | |
610 | * Make sure we are not delivering any more events | |
611 | * through this handle | |
612 | */ | |
82ba56c2 | 613 | synchronize_rcu(); |
8006479c DT |
614 | } |
615 | } | |
0fbf87ca | 616 | |
8006479c | 617 | out: |
e676c232 | 618 | mutex_unlock(&dev->mutex); |
8006479c | 619 | return retval; |
1da177e4 | 620 | } |
ca56fe07 | 621 | EXPORT_SYMBOL(input_open_device); |
1da177e4 | 622 | |
8006479c | 623 | int input_flush_device(struct input_handle *handle, struct file *file) |
1da177e4 | 624 | { |
8006479c DT |
625 | struct input_dev *dev = handle->dev; |
626 | int retval; | |
1da177e4 | 627 | |
8006479c DT |
628 | retval = mutex_lock_interruptible(&dev->mutex); |
629 | if (retval) | |
630 | return retval; | |
631 | ||
632 | if (dev->flush) | |
633 | retval = dev->flush(dev, file); | |
634 | ||
635 | mutex_unlock(&dev->mutex); | |
636 | return retval; | |
1da177e4 | 637 | } |
ca56fe07 | 638 | EXPORT_SYMBOL(input_flush_device); |
1da177e4 | 639 | |
8006479c DT |
640 | /** |
641 | * input_close_device - close input device | |
642 | * @handle: handle through which device is being accessed | |
643 | * | |
644 | * This function should be called by input handlers when they | |
645 | * want to stop receive events from given input device. | |
646 | */ | |
1da177e4 LT |
647 | void input_close_device(struct input_handle *handle) |
648 | { | |
0fbf87ca DT |
649 | struct input_dev *dev = handle->dev; |
650 | ||
e676c232 | 651 | mutex_lock(&dev->mutex); |
0fbf87ca | 652 | |
8006479c DT |
653 | __input_release_device(handle); |
654 | ||
0fbf87ca DT |
655 | if (!--dev->users && dev->close) |
656 | dev->close(dev); | |
8006479c DT |
657 | |
658 | if (!--handle->open) { | |
659 | /* | |
82ba56c2 | 660 | * synchronize_rcu() makes sure that input_pass_event() |
8006479c DT |
661 | * completed and that no more input events are delivered |
662 | * through this handle | |
663 | */ | |
82ba56c2 | 664 | synchronize_rcu(); |
8006479c | 665 | } |
0fbf87ca | 666 | |
e676c232 | 667 | mutex_unlock(&dev->mutex); |
1da177e4 | 668 | } |
ca56fe07 | 669 | EXPORT_SYMBOL(input_close_device); |
1da177e4 | 670 | |
866d7d7b ON |
671 | /* |
672 | * Simulate keyup events for all keys that are marked as pressed. | |
673 | * The function must be called with dev->event_lock held. | |
674 | */ | |
675 | static void input_dev_release_keys(struct input_dev *dev) | |
676 | { | |
00159f19 | 677 | bool need_sync = false; |
866d7d7b ON |
678 | int code; |
679 | ||
680 | if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) { | |
00159f19 | 681 | for_each_set_bit(code, dev->key, KEY_CNT) { |
3e2b03da | 682 | input_pass_event(dev, EV_KEY, code, 0); |
00159f19 DT |
683 | need_sync = true; |
684 | } | |
685 | ||
686 | if (need_sync) | |
687 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
688 | ||
3e2b03da | 689 | memset(dev->key, 0, sizeof(dev->key)); |
866d7d7b ON |
690 | } |
691 | } | |
692 | ||
8006479c DT |
693 | /* |
694 | * Prepare device for unregistering | |
695 | */ | |
696 | static void input_disconnect_device(struct input_dev *dev) | |
697 | { | |
698 | struct input_handle *handle; | |
8006479c DT |
699 | |
700 | /* | |
701 | * Mark device as going away. Note that we take dev->mutex here | |
702 | * not to protect access to dev->going_away but rather to ensure | |
703 | * that there are no threads in the middle of input_open_device() | |
704 | */ | |
705 | mutex_lock(&dev->mutex); | |
ffd0db97 | 706 | dev->going_away = true; |
8006479c DT |
707 | mutex_unlock(&dev->mutex); |
708 | ||
709 | spin_lock_irq(&dev->event_lock); | |
710 | ||
711 | /* | |
712 | * Simulate keyup events for all pressed keys so that handlers | |
713 | * are not left with "stuck" keys. The driver may continue | |
714 | * generate events even after we done here but they will not | |
715 | * reach any handlers. | |
716 | */ | |
866d7d7b | 717 | input_dev_release_keys(dev); |
8006479c DT |
718 | |
719 | list_for_each_entry(handle, &dev->h_list, d_node) | |
720 | handle->open = 0; | |
721 | ||
722 | spin_unlock_irq(&dev->event_lock); | |
723 | } | |
724 | ||
8613e4c2 MCC |
725 | /** |
726 | * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry | |
727 | * @ke: keymap entry containing scancode to be converted. | |
728 | * @scancode: pointer to the location where converted scancode should | |
729 | * be stored. | |
730 | * | |
731 | * This function is used to convert scancode stored in &struct keymap_entry | |
732 | * into scalar form understood by legacy keymap handling methods. These | |
733 | * methods expect scancodes to be represented as 'unsigned int'. | |
734 | */ | |
735 | int input_scancode_to_scalar(const struct input_keymap_entry *ke, | |
736 | unsigned int *scancode) | |
737 | { | |
738 | switch (ke->len) { | |
739 | case 1: | |
740 | *scancode = *((u8 *)ke->scancode); | |
741 | break; | |
742 | ||
743 | case 2: | |
744 | *scancode = *((u16 *)ke->scancode); | |
745 | break; | |
746 | ||
747 | case 4: | |
748 | *scancode = *((u32 *)ke->scancode); | |
749 | break; | |
750 | ||
751 | default: | |
752 | return -EINVAL; | |
753 | } | |
754 | ||
755 | return 0; | |
756 | } | |
757 | EXPORT_SYMBOL(input_scancode_to_scalar); | |
758 | ||
759 | /* | |
760 | * Those routines handle the default case where no [gs]etkeycode() is | |
761 | * defined. In this case, an array indexed by the scancode is used. | |
762 | */ | |
763 | ||
764 | static unsigned int input_fetch_keycode(struct input_dev *dev, | |
765 | unsigned int index) | |
c8e4c772 MR |
766 | { |
767 | switch (dev->keycodesize) { | |
8613e4c2 MCC |
768 | case 1: |
769 | return ((u8 *)dev->keycode)[index]; | |
c8e4c772 | 770 | |
8613e4c2 MCC |
771 | case 2: |
772 | return ((u16 *)dev->keycode)[index]; | |
c8e4c772 | 773 | |
8613e4c2 MCC |
774 | default: |
775 | return ((u32 *)dev->keycode)[index]; | |
c8e4c772 MR |
776 | } |
777 | } | |
778 | ||
779 | static int input_default_getkeycode(struct input_dev *dev, | |
8613e4c2 | 780 | struct input_keymap_entry *ke) |
c8e4c772 | 781 | { |
8613e4c2 MCC |
782 | unsigned int index; |
783 | int error; | |
784 | ||
c8e4c772 MR |
785 | if (!dev->keycodesize) |
786 | return -EINVAL; | |
787 | ||
8613e4c2 MCC |
788 | if (ke->flags & INPUT_KEYMAP_BY_INDEX) |
789 | index = ke->index; | |
790 | else { | |
791 | error = input_scancode_to_scalar(ke, &index); | |
792 | if (error) | |
793 | return error; | |
794 | } | |
795 | ||
796 | if (index >= dev->keycodemax) | |
c8e4c772 MR |
797 | return -EINVAL; |
798 | ||
8613e4c2 MCC |
799 | ke->keycode = input_fetch_keycode(dev, index); |
800 | ke->index = index; | |
801 | ke->len = sizeof(index); | |
802 | memcpy(ke->scancode, &index, sizeof(index)); | |
c8e4c772 MR |
803 | |
804 | return 0; | |
805 | } | |
806 | ||
807 | static int input_default_setkeycode(struct input_dev *dev, | |
8613e4c2 MCC |
808 | const struct input_keymap_entry *ke, |
809 | unsigned int *old_keycode) | |
c8e4c772 | 810 | { |
8613e4c2 MCC |
811 | unsigned int index; |
812 | int error; | |
c8e4c772 MR |
813 | int i; |
814 | ||
8613e4c2 | 815 | if (!dev->keycodesize) |
c8e4c772 MR |
816 | return -EINVAL; |
817 | ||
8613e4c2 MCC |
818 | if (ke->flags & INPUT_KEYMAP_BY_INDEX) { |
819 | index = ke->index; | |
820 | } else { | |
821 | error = input_scancode_to_scalar(ke, &index); | |
822 | if (error) | |
823 | return error; | |
824 | } | |
825 | ||
826 | if (index >= dev->keycodemax) | |
c8e4c772 MR |
827 | return -EINVAL; |
828 | ||
de391d12 | 829 | if (dev->keycodesize < sizeof(ke->keycode) && |
8613e4c2 | 830 | (ke->keycode >> (dev->keycodesize * 8))) |
c8e4c772 MR |
831 | return -EINVAL; |
832 | ||
833 | switch (dev->keycodesize) { | |
834 | case 1: { | |
835 | u8 *k = (u8 *)dev->keycode; | |
8613e4c2 MCC |
836 | *old_keycode = k[index]; |
837 | k[index] = ke->keycode; | |
c8e4c772 MR |
838 | break; |
839 | } | |
840 | case 2: { | |
841 | u16 *k = (u16 *)dev->keycode; | |
8613e4c2 MCC |
842 | *old_keycode = k[index]; |
843 | k[index] = ke->keycode; | |
c8e4c772 MR |
844 | break; |
845 | } | |
846 | default: { | |
847 | u32 *k = (u32 *)dev->keycode; | |
8613e4c2 MCC |
848 | *old_keycode = k[index]; |
849 | k[index] = ke->keycode; | |
c8e4c772 MR |
850 | break; |
851 | } | |
852 | } | |
853 | ||
8613e4c2 MCC |
854 | __clear_bit(*old_keycode, dev->keybit); |
855 | __set_bit(ke->keycode, dev->keybit); | |
c8e4c772 MR |
856 | |
857 | for (i = 0; i < dev->keycodemax; i++) { | |
8613e4c2 MCC |
858 | if (input_fetch_keycode(dev, i) == *old_keycode) { |
859 | __set_bit(*old_keycode, dev->keybit); | |
c8e4c772 MR |
860 | break; /* Setting the bit twice is useless, so break */ |
861 | } | |
862 | } | |
863 | ||
864 | return 0; | |
865 | } | |
866 | ||
f4f37c8e DT |
867 | /** |
868 | * input_get_keycode - retrieve keycode currently mapped to a given scancode | |
869 | * @dev: input device which keymap is being queried | |
8613e4c2 | 870 | * @ke: keymap entry |
f4f37c8e DT |
871 | * |
872 | * This function should be called by anyone interested in retrieving current | |
8613e4c2 | 873 | * keymap. Presently evdev handlers use it. |
f4f37c8e | 874 | */ |
8613e4c2 | 875 | int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke) |
f4f37c8e | 876 | { |
2e2e3b96 DT |
877 | unsigned long flags; |
878 | int retval; | |
879 | ||
880 | spin_lock_irqsave(&dev->event_lock, flags); | |
aebd636b | 881 | retval = dev->getkeycode(dev, ke); |
8613e4c2 | 882 | spin_unlock_irqrestore(&dev->event_lock, flags); |
aebd636b | 883 | |
2e2e3b96 | 884 | return retval; |
f4f37c8e DT |
885 | } |
886 | EXPORT_SYMBOL(input_get_keycode); | |
887 | ||
888 | /** | |
8613e4c2 | 889 | * input_set_keycode - attribute a keycode to a given scancode |
f4f37c8e | 890 | * @dev: input device which keymap is being updated |
8613e4c2 | 891 | * @ke: new keymap entry |
f4f37c8e DT |
892 | * |
893 | * This function should be called by anyone needing to update current | |
894 | * keymap. Presently keyboard and evdev handlers use it. | |
895 | */ | |
58b93995 | 896 | int input_set_keycode(struct input_dev *dev, |
8613e4c2 | 897 | const struct input_keymap_entry *ke) |
f4f37c8e DT |
898 | { |
899 | unsigned long flags; | |
fd6cf3dd | 900 | unsigned int old_keycode; |
f4f37c8e DT |
901 | int retval; |
902 | ||
8613e4c2 | 903 | if (ke->keycode > KEY_MAX) |
f4f37c8e DT |
904 | return -EINVAL; |
905 | ||
906 | spin_lock_irqsave(&dev->event_lock, flags); | |
907 | ||
aebd636b | 908 | retval = dev->setkeycode(dev, ke, &old_keycode); |
f4f37c8e DT |
909 | if (retval) |
910 | goto out; | |
911 | ||
4f93df40 DT |
912 | /* Make sure KEY_RESERVED did not get enabled. */ |
913 | __clear_bit(KEY_RESERVED, dev->keybit); | |
914 | ||
f4f37c8e DT |
915 | /* |
916 | * Simulate keyup event if keycode is not present | |
917 | * in the keymap anymore | |
918 | */ | |
919 | if (test_bit(EV_KEY, dev->evbit) && | |
920 | !is_event_supported(old_keycode, dev->keybit, KEY_MAX) && | |
921 | __test_and_clear_bit(old_keycode, dev->key)) { | |
4369c64c HR |
922 | struct input_value vals[] = { |
923 | { EV_KEY, old_keycode, 0 }, | |
924 | input_value_sync | |
925 | }; | |
f4f37c8e | 926 | |
4369c64c | 927 | input_pass_values(dev, vals, ARRAY_SIZE(vals)); |
f4f37c8e DT |
928 | } |
929 | ||
930 | out: | |
931 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
932 | ||
933 | return retval; | |
934 | } | |
935 | EXPORT_SYMBOL(input_set_keycode); | |
c8e4c772 | 936 | |
0b7024ac | 937 | static const struct input_device_id *input_match_device(struct input_handler *handler, |
66e66118 | 938 | struct input_dev *dev) |
1da177e4 | 939 | { |
0b7024ac | 940 | const struct input_device_id *id; |
1da177e4 | 941 | |
0b7024ac | 942 | for (id = handler->id_table; id->flags || id->driver_info; id++) { |
1da177e4 LT |
943 | |
944 | if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) | |
ddc5d341 | 945 | if (id->bustype != dev->id.bustype) |
1da177e4 LT |
946 | continue; |
947 | ||
948 | if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) | |
ddc5d341 | 949 | if (id->vendor != dev->id.vendor) |
1da177e4 LT |
950 | continue; |
951 | ||
952 | if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) | |
ddc5d341 | 953 | if (id->product != dev->id.product) |
1da177e4 LT |
954 | continue; |
955 | ||
956 | if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) | |
ddc5d341 | 957 | if (id->version != dev->id.version) |
1da177e4 LT |
958 | continue; |
959 | ||
c0bb1f97 DT |
960 | if (!bitmap_subset(id->evbit, dev->evbit, EV_MAX)) |
961 | continue; | |
962 | ||
963 | if (!bitmap_subset(id->keybit, dev->keybit, KEY_MAX)) | |
964 | continue; | |
965 | ||
966 | if (!bitmap_subset(id->relbit, dev->relbit, REL_MAX)) | |
967 | continue; | |
968 | ||
969 | if (!bitmap_subset(id->absbit, dev->absbit, ABS_MAX)) | |
970 | continue; | |
971 | ||
972 | if (!bitmap_subset(id->mscbit, dev->mscbit, MSC_MAX)) | |
973 | continue; | |
974 | ||
975 | if (!bitmap_subset(id->ledbit, dev->ledbit, LED_MAX)) | |
976 | continue; | |
977 | ||
978 | if (!bitmap_subset(id->sndbit, dev->sndbit, SND_MAX)) | |
979 | continue; | |
980 | ||
981 | if (!bitmap_subset(id->ffbit, dev->ffbit, FF_MAX)) | |
982 | continue; | |
983 | ||
984 | if (!bitmap_subset(id->swbit, dev->swbit, SW_MAX)) | |
985 | continue; | |
1da177e4 | 986 | |
0b7024ac DT |
987 | if (!handler->match || handler->match(handler, dev)) |
988 | return id; | |
1da177e4 LT |
989 | } |
990 | ||
991 | return NULL; | |
992 | } | |
993 | ||
5b2a0826 DT |
994 | static int input_attach_handler(struct input_dev *dev, struct input_handler *handler) |
995 | { | |
996 | const struct input_device_id *id; | |
997 | int error; | |
998 | ||
0b7024ac | 999 | id = input_match_device(handler, dev); |
5b2a0826 DT |
1000 | if (!id) |
1001 | return -ENODEV; | |
1002 | ||
1003 | error = handler->connect(handler, dev, id); | |
1004 | if (error && error != -ENODEV) | |
da0c4901 JP |
1005 | pr_err("failed to attach handler %s to device %s, error: %d\n", |
1006 | handler->name, kobject_name(&dev->dev.kobj), error); | |
5b2a0826 DT |
1007 | |
1008 | return error; | |
1009 | } | |
1010 | ||
15e184af DT |
1011 | #ifdef CONFIG_COMPAT |
1012 | ||
1013 | static int input_bits_to_string(char *buf, int buf_size, | |
1014 | unsigned long bits, bool skip_empty) | |
1015 | { | |
1016 | int len = 0; | |
1017 | ||
b8b4ead1 | 1018 | if (in_compat_syscall()) { |
15e184af DT |
1019 | u32 dword = bits >> 32; |
1020 | if (dword || !skip_empty) | |
1021 | len += snprintf(buf, buf_size, "%x ", dword); | |
1022 | ||
1023 | dword = bits & 0xffffffffUL; | |
1024 | if (dword || !skip_empty || len) | |
1025 | len += snprintf(buf + len, max(buf_size - len, 0), | |
1026 | "%x", dword); | |
1027 | } else { | |
1028 | if (bits || !skip_empty) | |
1029 | len += snprintf(buf, buf_size, "%lx", bits); | |
1030 | } | |
1031 | ||
1032 | return len; | |
1033 | } | |
1034 | ||
1035 | #else /* !CONFIG_COMPAT */ | |
1036 | ||
1037 | static int input_bits_to_string(char *buf, int buf_size, | |
1038 | unsigned long bits, bool skip_empty) | |
1039 | { | |
1040 | return bits || !skip_empty ? | |
1041 | snprintf(buf, buf_size, "%lx", bits) : 0; | |
1042 | } | |
1043 | ||
1044 | #endif | |
5b2a0826 | 1045 | |
f96b434d DT |
1046 | #ifdef CONFIG_PROC_FS |
1047 | ||
1048 | static struct proc_dir_entry *proc_bus_input_dir; | |
1049 | static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); | |
1050 | static int input_devices_state; | |
1051 | ||
1052 | static inline void input_wakeup_procfs_readers(void) | |
1053 | { | |
1054 | input_devices_state++; | |
1055 | wake_up(&input_devices_poll_wait); | |
1056 | } | |
1057 | ||
969b21cd | 1058 | static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait) |
f96b434d | 1059 | { |
f96b434d | 1060 | poll_wait(file, &input_devices_poll_wait, wait); |
fa886612 DT |
1061 | if (file->f_version != input_devices_state) { |
1062 | file->f_version = input_devices_state; | |
f96b434d | 1063 | return POLLIN | POLLRDNORM; |
fa886612 | 1064 | } |
1e0afb28 | 1065 | |
f96b434d DT |
1066 | return 0; |
1067 | } | |
1068 | ||
1572ca2a DT |
1069 | union input_seq_state { |
1070 | struct { | |
1071 | unsigned short pos; | |
1072 | bool mutex_acquired; | |
1073 | }; | |
1074 | void *p; | |
1075 | }; | |
1076 | ||
969b21cd DT |
1077 | static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) |
1078 | { | |
1572ca2a DT |
1079 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1080 | int error; | |
1081 | ||
1082 | /* We need to fit into seq->private pointer */ | |
1083 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
1084 | ||
1085 | error = mutex_lock_interruptible(&input_mutex); | |
1086 | if (error) { | |
1087 | state->mutex_acquired = false; | |
1088 | return ERR_PTR(error); | |
1089 | } | |
1090 | ||
1091 | state->mutex_acquired = true; | |
f96b434d | 1092 | |
ad5d972c | 1093 | return seq_list_start(&input_dev_list, *pos); |
969b21cd | 1094 | } |
051b2fea | 1095 | |
969b21cd DT |
1096 | static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1097 | { | |
ad5d972c | 1098 | return seq_list_next(v, &input_dev_list, pos); |
969b21cd | 1099 | } |
f96b434d | 1100 | |
1572ca2a | 1101 | static void input_seq_stop(struct seq_file *seq, void *v) |
969b21cd | 1102 | { |
1572ca2a DT |
1103 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1104 | ||
1105 | if (state->mutex_acquired) | |
1106 | mutex_unlock(&input_mutex); | |
969b21cd | 1107 | } |
f96b434d | 1108 | |
969b21cd DT |
1109 | static void input_seq_print_bitmap(struct seq_file *seq, const char *name, |
1110 | unsigned long *bitmap, int max) | |
1111 | { | |
1112 | int i; | |
15e184af DT |
1113 | bool skip_empty = true; |
1114 | char buf[18]; | |
f96b434d | 1115 | |
969b21cd | 1116 | seq_printf(seq, "B: %s=", name); |
15e184af DT |
1117 | |
1118 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
1119 | if (input_bits_to_string(buf, sizeof(buf), | |
1120 | bitmap[i], skip_empty)) { | |
1121 | skip_empty = false; | |
1122 | seq_printf(seq, "%s%s", buf, i > 0 ? " " : ""); | |
1123 | } | |
1124 | } | |
1125 | ||
1126 | /* | |
1127 | * If no output was produced print a single 0. | |
1128 | */ | |
1129 | if (skip_empty) | |
1130 | seq_puts(seq, "0"); | |
1131 | ||
969b21cd DT |
1132 | seq_putc(seq, '\n'); |
1133 | } | |
f96b434d | 1134 | |
969b21cd DT |
1135 | static int input_devices_seq_show(struct seq_file *seq, void *v) |
1136 | { | |
1137 | struct input_dev *dev = container_of(v, struct input_dev, node); | |
9657d75c | 1138 | const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
969b21cd DT |
1139 | struct input_handle *handle; |
1140 | ||
1141 | seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", | |
1142 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); | |
1143 | ||
1144 | seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); | |
1145 | seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : ""); | |
1146 | seq_printf(seq, "S: Sysfs=%s\n", path ? path : ""); | |
15e03ae8 | 1147 | seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : ""); |
969b21cd DT |
1148 | seq_printf(seq, "H: Handlers="); |
1149 | ||
1150 | list_for_each_entry(handle, &dev->h_list, d_node) | |
1151 | seq_printf(seq, "%s ", handle->name); | |
1152 | seq_putc(seq, '\n'); | |
1153 | ||
85b77200 HR |
1154 | input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX); |
1155 | ||
969b21cd DT |
1156 | input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); |
1157 | if (test_bit(EV_KEY, dev->evbit)) | |
1158 | input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); | |
1159 | if (test_bit(EV_REL, dev->evbit)) | |
1160 | input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); | |
1161 | if (test_bit(EV_ABS, dev->evbit)) | |
1162 | input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); | |
1163 | if (test_bit(EV_MSC, dev->evbit)) | |
1164 | input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); | |
1165 | if (test_bit(EV_LED, dev->evbit)) | |
1166 | input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); | |
1167 | if (test_bit(EV_SND, dev->evbit)) | |
1168 | input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); | |
1169 | if (test_bit(EV_FF, dev->evbit)) | |
1170 | input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); | |
1171 | if (test_bit(EV_SW, dev->evbit)) | |
1172 | input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); | |
1173 | ||
1174 | seq_putc(seq, '\n'); | |
1175 | ||
1176 | kfree(path); | |
1177 | return 0; | |
f96b434d DT |
1178 | } |
1179 | ||
cec69c37 | 1180 | static const struct seq_operations input_devices_seq_ops = { |
969b21cd DT |
1181 | .start = input_devices_seq_start, |
1182 | .next = input_devices_seq_next, | |
1572ca2a | 1183 | .stop = input_seq_stop, |
969b21cd DT |
1184 | .show = input_devices_seq_show, |
1185 | }; | |
1186 | ||
1187 | static int input_proc_devices_open(struct inode *inode, struct file *file) | |
f96b434d | 1188 | { |
969b21cd DT |
1189 | return seq_open(file, &input_devices_seq_ops); |
1190 | } | |
1191 | ||
2b8693c0 | 1192 | static const struct file_operations input_devices_fileops = { |
969b21cd DT |
1193 | .owner = THIS_MODULE, |
1194 | .open = input_proc_devices_open, | |
1195 | .poll = input_proc_devices_poll, | |
1196 | .read = seq_read, | |
1197 | .llseek = seq_lseek, | |
1198 | .release = seq_release, | |
1199 | }; | |
1200 | ||
1201 | static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) | |
1202 | { | |
1572ca2a DT |
1203 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1204 | int error; | |
1205 | ||
1206 | /* We need to fit into seq->private pointer */ | |
1207 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
1208 | ||
1209 | error = mutex_lock_interruptible(&input_mutex); | |
1210 | if (error) { | |
1211 | state->mutex_acquired = false; | |
1212 | return ERR_PTR(error); | |
1213 | } | |
1214 | ||
1215 | state->mutex_acquired = true; | |
1216 | state->pos = *pos; | |
8006479c | 1217 | |
ad5d972c | 1218 | return seq_list_start(&input_handler_list, *pos); |
969b21cd | 1219 | } |
f96b434d | 1220 | |
969b21cd DT |
1221 | static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1222 | { | |
1572ca2a | 1223 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
f96b434d | 1224 | |
1572ca2a DT |
1225 | state->pos = *pos + 1; |
1226 | return seq_list_next(v, &input_handler_list, pos); | |
969b21cd DT |
1227 | } |
1228 | ||
1229 | static int input_handlers_seq_show(struct seq_file *seq, void *v) | |
1230 | { | |
1231 | struct input_handler *handler = container_of(v, struct input_handler, node); | |
1572ca2a | 1232 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
969b21cd | 1233 | |
1572ca2a | 1234 | seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name); |
ef7995f4 DT |
1235 | if (handler->filter) |
1236 | seq_puts(seq, " (filter)"); | |
7f8d4cad | 1237 | if (handler->legacy_minors) |
969b21cd DT |
1238 | seq_printf(seq, " Minor=%d", handler->minor); |
1239 | seq_putc(seq, '\n'); | |
1240 | ||
1241 | return 0; | |
1242 | } | |
1572ca2a | 1243 | |
cec69c37 | 1244 | static const struct seq_operations input_handlers_seq_ops = { |
969b21cd DT |
1245 | .start = input_handlers_seq_start, |
1246 | .next = input_handlers_seq_next, | |
1572ca2a | 1247 | .stop = input_seq_stop, |
969b21cd DT |
1248 | .show = input_handlers_seq_show, |
1249 | }; | |
1250 | ||
1251 | static int input_proc_handlers_open(struct inode *inode, struct file *file) | |
1252 | { | |
1253 | return seq_open(file, &input_handlers_seq_ops); | |
1254 | } | |
1255 | ||
2b8693c0 | 1256 | static const struct file_operations input_handlers_fileops = { |
969b21cd DT |
1257 | .owner = THIS_MODULE, |
1258 | .open = input_proc_handlers_open, | |
1259 | .read = seq_read, | |
1260 | .llseek = seq_lseek, | |
1261 | .release = seq_release, | |
1262 | }; | |
f96b434d DT |
1263 | |
1264 | static int __init input_proc_init(void) | |
1265 | { | |
1266 | struct proc_dir_entry *entry; | |
1267 | ||
9c37066d | 1268 | proc_bus_input_dir = proc_mkdir("bus/input", NULL); |
f96b434d DT |
1269 | if (!proc_bus_input_dir) |
1270 | return -ENOMEM; | |
1271 | ||
c7705f34 DL |
1272 | entry = proc_create("devices", 0, proc_bus_input_dir, |
1273 | &input_devices_fileops); | |
f96b434d DT |
1274 | if (!entry) |
1275 | goto fail1; | |
1276 | ||
c7705f34 DL |
1277 | entry = proc_create("handlers", 0, proc_bus_input_dir, |
1278 | &input_handlers_fileops); | |
f96b434d DT |
1279 | if (!entry) |
1280 | goto fail2; | |
1281 | ||
f96b434d DT |
1282 | return 0; |
1283 | ||
1284 | fail2: remove_proc_entry("devices", proc_bus_input_dir); | |
9c37066d | 1285 | fail1: remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1286 | return -ENOMEM; |
1287 | } | |
1288 | ||
beffbdc2 | 1289 | static void input_proc_exit(void) |
f96b434d DT |
1290 | { |
1291 | remove_proc_entry("devices", proc_bus_input_dir); | |
1292 | remove_proc_entry("handlers", proc_bus_input_dir); | |
9c37066d | 1293 | remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1294 | } |
1295 | ||
1296 | #else /* !CONFIG_PROC_FS */ | |
1297 | static inline void input_wakeup_procfs_readers(void) { } | |
1298 | static inline int input_proc_init(void) { return 0; } | |
1299 | static inline void input_proc_exit(void) { } | |
1300 | #endif | |
1301 | ||
9657d75c DT |
1302 | #define INPUT_DEV_STRING_ATTR_SHOW(name) \ |
1303 | static ssize_t input_dev_show_##name(struct device *dev, \ | |
1304 | struct device_attribute *attr, \ | |
1305 | char *buf) \ | |
1306 | { \ | |
1307 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1308 | \ | |
1309 | return scnprintf(buf, PAGE_SIZE, "%s\n", \ | |
1310 | input_dev->name ? input_dev->name : ""); \ | |
1311 | } \ | |
1312 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL) | |
5c1e9a6a DT |
1313 | |
1314 | INPUT_DEV_STRING_ATTR_SHOW(name); | |
1315 | INPUT_DEV_STRING_ATTR_SHOW(phys); | |
1316 | INPUT_DEV_STRING_ATTR_SHOW(uniq); | |
1317 | ||
ac648a6a DT |
1318 | static int input_print_modalias_bits(char *buf, int size, |
1319 | char name, unsigned long *bm, | |
1320 | unsigned int min_bit, unsigned int max_bit) | |
1d8f430c | 1321 | { |
ac648a6a | 1322 | int len = 0, i; |
1d8f430c | 1323 | |
ac648a6a DT |
1324 | len += snprintf(buf, max(size, 0), "%c", name); |
1325 | for (i = min_bit; i < max_bit; i++) | |
7b19ada2 | 1326 | if (bm[BIT_WORD(i)] & BIT_MASK(i)) |
ac648a6a | 1327 | len += snprintf(buf + len, max(size - len, 0), "%X,", i); |
1d8f430c RR |
1328 | return len; |
1329 | } | |
1330 | ||
2db66876 DT |
1331 | static int input_print_modalias(char *buf, int size, struct input_dev *id, |
1332 | int add_cr) | |
1d8f430c | 1333 | { |
bd37e5a9 | 1334 | int len; |
1d8f430c | 1335 | |
ac648a6a DT |
1336 | len = snprintf(buf, max(size, 0), |
1337 | "input:b%04Xv%04Xp%04Xe%04X-", | |
1338 | id->id.bustype, id->id.vendor, | |
1339 | id->id.product, id->id.version); | |
1340 | ||
1341 | len += input_print_modalias_bits(buf + len, size - len, | |
1342 | 'e', id->evbit, 0, EV_MAX); | |
1343 | len += input_print_modalias_bits(buf + len, size - len, | |
1344 | 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); | |
1345 | len += input_print_modalias_bits(buf + len, size - len, | |
1346 | 'r', id->relbit, 0, REL_MAX); | |
1347 | len += input_print_modalias_bits(buf + len, size - len, | |
1348 | 'a', id->absbit, 0, ABS_MAX); | |
1349 | len += input_print_modalias_bits(buf + len, size - len, | |
1350 | 'm', id->mscbit, 0, MSC_MAX); | |
1351 | len += input_print_modalias_bits(buf + len, size - len, | |
1352 | 'l', id->ledbit, 0, LED_MAX); | |
1353 | len += input_print_modalias_bits(buf + len, size - len, | |
1354 | 's', id->sndbit, 0, SND_MAX); | |
1355 | len += input_print_modalias_bits(buf + len, size - len, | |
1356 | 'f', id->ffbit, 0, FF_MAX); | |
1357 | len += input_print_modalias_bits(buf + len, size - len, | |
1358 | 'w', id->swbit, 0, SW_MAX); | |
2db66876 DT |
1359 | |
1360 | if (add_cr) | |
ac648a6a | 1361 | len += snprintf(buf + len, max(size - len, 0), "\n"); |
2db66876 | 1362 | |
bd37e5a9 KS |
1363 | return len; |
1364 | } | |
1365 | ||
9657d75c DT |
1366 | static ssize_t input_dev_show_modalias(struct device *dev, |
1367 | struct device_attribute *attr, | |
1368 | char *buf) | |
bd37e5a9 KS |
1369 | { |
1370 | struct input_dev *id = to_input_dev(dev); | |
1371 | ssize_t len; | |
1372 | ||
2db66876 DT |
1373 | len = input_print_modalias(buf, PAGE_SIZE, id, 1); |
1374 | ||
8a3cf456 | 1375 | return min_t(int, len, PAGE_SIZE); |
1d8f430c | 1376 | } |
9657d75c | 1377 | static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); |
1d8f430c | 1378 | |
85b77200 HR |
1379 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1380 | int max, int add_cr); | |
1381 | ||
1382 | static ssize_t input_dev_show_properties(struct device *dev, | |
1383 | struct device_attribute *attr, | |
1384 | char *buf) | |
1385 | { | |
1386 | struct input_dev *input_dev = to_input_dev(dev); | |
1387 | int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit, | |
1388 | INPUT_PROP_MAX, true); | |
1389 | return min_t(int, len, PAGE_SIZE); | |
1390 | } | |
1391 | static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL); | |
1392 | ||
629b77a4 | 1393 | static struct attribute *input_dev_attrs[] = { |
9657d75c DT |
1394 | &dev_attr_name.attr, |
1395 | &dev_attr_phys.attr, | |
1396 | &dev_attr_uniq.attr, | |
1397 | &dev_attr_modalias.attr, | |
85b77200 | 1398 | &dev_attr_properties.attr, |
629b77a4 GKH |
1399 | NULL |
1400 | }; | |
1401 | ||
bd0ef235 | 1402 | static struct attribute_group input_dev_attr_group = { |
629b77a4 | 1403 | .attrs = input_dev_attrs, |
5c1e9a6a DT |
1404 | }; |
1405 | ||
9657d75c DT |
1406 | #define INPUT_DEV_ID_ATTR(name) \ |
1407 | static ssize_t input_dev_show_id_##name(struct device *dev, \ | |
1408 | struct device_attribute *attr, \ | |
1409 | char *buf) \ | |
1410 | { \ | |
1411 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1412 | return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \ | |
1413 | } \ | |
1414 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL) | |
5c1e9a6a DT |
1415 | |
1416 | INPUT_DEV_ID_ATTR(bustype); | |
1417 | INPUT_DEV_ID_ATTR(vendor); | |
1418 | INPUT_DEV_ID_ATTR(product); | |
1419 | INPUT_DEV_ID_ATTR(version); | |
1420 | ||
1421 | static struct attribute *input_dev_id_attrs[] = { | |
9657d75c DT |
1422 | &dev_attr_bustype.attr, |
1423 | &dev_attr_vendor.attr, | |
1424 | &dev_attr_product.attr, | |
1425 | &dev_attr_version.attr, | |
5c1e9a6a DT |
1426 | NULL |
1427 | }; | |
1428 | ||
1429 | static struct attribute_group input_dev_id_attr_group = { | |
1430 | .name = "id", | |
1431 | .attrs = input_dev_id_attrs, | |
1432 | }; | |
1433 | ||
969b21cd DT |
1434 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1435 | int max, int add_cr) | |
1436 | { | |
1437 | int i; | |
1438 | int len = 0; | |
15e184af DT |
1439 | bool skip_empty = true; |
1440 | ||
1441 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
1442 | len += input_bits_to_string(buf + len, max(buf_size - len, 0), | |
1443 | bitmap[i], skip_empty); | |
1444 | if (len) { | |
1445 | skip_empty = false; | |
1446 | if (i > 0) | |
1447 | len += snprintf(buf + len, max(buf_size - len, 0), " "); | |
1448 | } | |
1449 | } | |
969b21cd | 1450 | |
15e184af DT |
1451 | /* |
1452 | * If no output was produced print a single 0. | |
1453 | */ | |
1454 | if (len == 0) | |
1455 | len = snprintf(buf, buf_size, "%d", 0); | |
969b21cd DT |
1456 | |
1457 | if (add_cr) | |
1458 | len += snprintf(buf + len, max(buf_size - len, 0), "\n"); | |
1459 | ||
1460 | return len; | |
1461 | } | |
1462 | ||
9657d75c DT |
1463 | #define INPUT_DEV_CAP_ATTR(ev, bm) \ |
1464 | static ssize_t input_dev_show_cap_##bm(struct device *dev, \ | |
1465 | struct device_attribute *attr, \ | |
1466 | char *buf) \ | |
1467 | { \ | |
1468 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1469 | int len = input_print_bitmap(buf, PAGE_SIZE, \ | |
15e184af DT |
1470 | input_dev->bm##bit, ev##_MAX, \ |
1471 | true); \ | |
9657d75c DT |
1472 | return min_t(int, len, PAGE_SIZE); \ |
1473 | } \ | |
1474 | static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL) | |
5c1e9a6a DT |
1475 | |
1476 | INPUT_DEV_CAP_ATTR(EV, ev); | |
1477 | INPUT_DEV_CAP_ATTR(KEY, key); | |
1478 | INPUT_DEV_CAP_ATTR(REL, rel); | |
1479 | INPUT_DEV_CAP_ATTR(ABS, abs); | |
1480 | INPUT_DEV_CAP_ATTR(MSC, msc); | |
1481 | INPUT_DEV_CAP_ATTR(LED, led); | |
1482 | INPUT_DEV_CAP_ATTR(SND, snd); | |
1483 | INPUT_DEV_CAP_ATTR(FF, ff); | |
1484 | INPUT_DEV_CAP_ATTR(SW, sw); | |
1485 | ||
1486 | static struct attribute *input_dev_caps_attrs[] = { | |
9657d75c DT |
1487 | &dev_attr_ev.attr, |
1488 | &dev_attr_key.attr, | |
1489 | &dev_attr_rel.attr, | |
1490 | &dev_attr_abs.attr, | |
1491 | &dev_attr_msc.attr, | |
1492 | &dev_attr_led.attr, | |
1493 | &dev_attr_snd.attr, | |
1494 | &dev_attr_ff.attr, | |
1495 | &dev_attr_sw.attr, | |
5c1e9a6a DT |
1496 | NULL |
1497 | }; | |
1498 | ||
1499 | static struct attribute_group input_dev_caps_attr_group = { | |
1500 | .name = "capabilities", | |
1501 | .attrs = input_dev_caps_attrs, | |
1502 | }; | |
1503 | ||
a4dbd674 | 1504 | static const struct attribute_group *input_dev_attr_groups[] = { |
cb9def4d DT |
1505 | &input_dev_attr_group, |
1506 | &input_dev_id_attr_group, | |
1507 | &input_dev_caps_attr_group, | |
1508 | NULL | |
1509 | }; | |
1510 | ||
9657d75c | 1511 | static void input_dev_release(struct device *device) |
d19fbe8a | 1512 | { |
9657d75c | 1513 | struct input_dev *dev = to_input_dev(device); |
d19fbe8a | 1514 | |
509ca1a9 | 1515 | input_ff_destroy(dev); |
40d007e7 | 1516 | input_mt_destroy_slots(dev); |
d31b2865 | 1517 | kfree(dev->absinfo); |
4369c64c | 1518 | kfree(dev->vals); |
d19fbe8a | 1519 | kfree(dev); |
509ca1a9 | 1520 | |
d19fbe8a DT |
1521 | module_put(THIS_MODULE); |
1522 | } | |
1523 | ||
a7fadbe1 | 1524 | /* |
312c004d | 1525 | * Input uevent interface - loading event handlers based on |
a7fadbe1 DT |
1526 | * device bitfields. |
1527 | */ | |
7eff2e7a | 1528 | static int input_add_uevent_bm_var(struct kobj_uevent_env *env, |
ac648a6a | 1529 | const char *name, unsigned long *bitmap, int max) |
a7fadbe1 | 1530 | { |
7eff2e7a | 1531 | int len; |
a7fadbe1 | 1532 | |
fcd3027a | 1533 | if (add_uevent_var(env, "%s", name)) |
a7fadbe1 DT |
1534 | return -ENOMEM; |
1535 | ||
7eff2e7a KS |
1536 | len = input_print_bitmap(&env->buf[env->buflen - 1], |
1537 | sizeof(env->buf) - env->buflen, | |
15e184af | 1538 | bitmap, max, false); |
7eff2e7a | 1539 | if (len >= (sizeof(env->buf) - env->buflen)) |
a7fadbe1 DT |
1540 | return -ENOMEM; |
1541 | ||
7eff2e7a | 1542 | env->buflen += len; |
a7fadbe1 DT |
1543 | return 0; |
1544 | } | |
1545 | ||
7eff2e7a | 1546 | static int input_add_uevent_modalias_var(struct kobj_uevent_env *env, |
ac648a6a DT |
1547 | struct input_dev *dev) |
1548 | { | |
7eff2e7a | 1549 | int len; |
ac648a6a | 1550 | |
7eff2e7a | 1551 | if (add_uevent_var(env, "MODALIAS=")) |
ac648a6a DT |
1552 | return -ENOMEM; |
1553 | ||
7eff2e7a KS |
1554 | len = input_print_modalias(&env->buf[env->buflen - 1], |
1555 | sizeof(env->buf) - env->buflen, | |
1556 | dev, 0); | |
1557 | if (len >= (sizeof(env->buf) - env->buflen)) | |
ac648a6a DT |
1558 | return -ENOMEM; |
1559 | ||
7eff2e7a | 1560 | env->buflen += len; |
ac648a6a DT |
1561 | return 0; |
1562 | } | |
1563 | ||
a7fadbe1 DT |
1564 | #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \ |
1565 | do { \ | |
7eff2e7a | 1566 | int err = add_uevent_var(env, fmt, val); \ |
a7fadbe1 DT |
1567 | if (err) \ |
1568 | return err; \ | |
1569 | } while (0) | |
1570 | ||
1571 | #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \ | |
1572 | do { \ | |
7eff2e7a | 1573 | int err = input_add_uevent_bm_var(env, name, bm, max); \ |
a7fadbe1 DT |
1574 | if (err) \ |
1575 | return err; \ | |
1576 | } while (0) | |
1577 | ||
ac648a6a DT |
1578 | #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \ |
1579 | do { \ | |
7eff2e7a | 1580 | int err = input_add_uevent_modalias_var(env, dev); \ |
ac648a6a DT |
1581 | if (err) \ |
1582 | return err; \ | |
1583 | } while (0) | |
1584 | ||
7eff2e7a | 1585 | static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env) |
a7fadbe1 | 1586 | { |
9657d75c | 1587 | struct input_dev *dev = to_input_dev(device); |
a7fadbe1 DT |
1588 | |
1589 | INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x", | |
1590 | dev->id.bustype, dev->id.vendor, | |
1591 | dev->id.product, dev->id.version); | |
1592 | if (dev->name) | |
1593 | INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); | |
1594 | if (dev->phys) | |
1595 | INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); | |
08de1f04 | 1596 | if (dev->uniq) |
a7fadbe1 DT |
1597 | INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); |
1598 | ||
85b77200 HR |
1599 | INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX); |
1600 | ||
a7fadbe1 DT |
1601 | INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX); |
1602 | if (test_bit(EV_KEY, dev->evbit)) | |
1603 | INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX); | |
1604 | if (test_bit(EV_REL, dev->evbit)) | |
1605 | INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX); | |
1606 | if (test_bit(EV_ABS, dev->evbit)) | |
1607 | INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX); | |
1608 | if (test_bit(EV_MSC, dev->evbit)) | |
1609 | INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX); | |
1610 | if (test_bit(EV_LED, dev->evbit)) | |
1611 | INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX); | |
1612 | if (test_bit(EV_SND, dev->evbit)) | |
1613 | INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX); | |
1614 | if (test_bit(EV_FF, dev->evbit)) | |
1615 | INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX); | |
1616 | if (test_bit(EV_SW, dev->evbit)) | |
1617 | INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); | |
1618 | ||
ac648a6a | 1619 | INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); |
a7fadbe1 DT |
1620 | |
1621 | return 0; | |
1622 | } | |
1623 | ||
3cc96351 DT |
1624 | #define INPUT_DO_TOGGLE(dev, type, bits, on) \ |
1625 | do { \ | |
1626 | int i; \ | |
1627 | bool active; \ | |
1628 | \ | |
1629 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1630 | break; \ | |
1631 | \ | |
3e2b03da | 1632 | for_each_set_bit(i, dev->bits##bit, type##_CNT) { \ |
3cc96351 DT |
1633 | active = test_bit(i, dev->bits); \ |
1634 | if (!active && !on) \ | |
1635 | continue; \ | |
1636 | \ | |
1637 | dev->event(dev, EV_##type, i, on ? active : 0); \ | |
1638 | } \ | |
ffd0db97 DT |
1639 | } while (0) |
1640 | ||
b50b5216 | 1641 | static void input_dev_toggle(struct input_dev *dev, bool activate) |
ffd0db97 DT |
1642 | { |
1643 | if (!dev->event) | |
1644 | return; | |
1645 | ||
1646 | INPUT_DO_TOGGLE(dev, LED, led, activate); | |
1647 | INPUT_DO_TOGGLE(dev, SND, snd, activate); | |
1648 | ||
1649 | if (activate && test_bit(EV_REP, dev->evbit)) { | |
1650 | dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]); | |
1651 | dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]); | |
1652 | } | |
1653 | } | |
1654 | ||
b50b5216 DT |
1655 | /** |
1656 | * input_reset_device() - reset/restore the state of input device | |
1657 | * @dev: input device whose state needs to be reset | |
1658 | * | |
1659 | * This function tries to reset the state of an opened input device and | |
1660 | * bring internal state and state if the hardware in sync with each other. | |
1661 | * We mark all keys as released, restore LED state, repeat rate, etc. | |
1662 | */ | |
1663 | void input_reset_device(struct input_dev *dev) | |
1664 | { | |
768d9aa5 | 1665 | unsigned long flags; |
b50b5216 | 1666 | |
768d9aa5 AM |
1667 | mutex_lock(&dev->mutex); |
1668 | spin_lock_irqsave(&dev->event_lock, flags); | |
b50b5216 | 1669 | |
768d9aa5 AM |
1670 | input_dev_toggle(dev, true); |
1671 | input_dev_release_keys(dev); | |
b50b5216 | 1672 | |
768d9aa5 | 1673 | spin_unlock_irqrestore(&dev->event_lock, flags); |
b50b5216 DT |
1674 | mutex_unlock(&dev->mutex); |
1675 | } | |
1676 | EXPORT_SYMBOL(input_reset_device); | |
1677 | ||
768d9aa5 | 1678 | #ifdef CONFIG_PM_SLEEP |
ffd0db97 DT |
1679 | static int input_dev_suspend(struct device *dev) |
1680 | { | |
1681 | struct input_dev *input_dev = to_input_dev(dev); | |
1682 | ||
768d9aa5 | 1683 | spin_lock_irq(&input_dev->event_lock); |
b50b5216 | 1684 | |
768d9aa5 AM |
1685 | /* |
1686 | * Keys that are pressed now are unlikely to be | |
1687 | * still pressed when we resume. | |
1688 | */ | |
1689 | input_dev_release_keys(input_dev); | |
b50b5216 | 1690 | |
768d9aa5 AM |
1691 | /* Turn off LEDs and sounds, if any are active. */ |
1692 | input_dev_toggle(input_dev, false); | |
1693 | ||
1694 | spin_unlock_irq(&input_dev->event_lock); | |
ffd0db97 DT |
1695 | |
1696 | return 0; | |
1697 | } | |
1698 | ||
1699 | static int input_dev_resume(struct device *dev) | |
1700 | { | |
1701 | struct input_dev *input_dev = to_input_dev(dev); | |
1702 | ||
768d9aa5 AM |
1703 | spin_lock_irq(&input_dev->event_lock); |
1704 | ||
1705 | /* Restore state of LEDs and sounds, if any were active. */ | |
1706 | input_dev_toggle(input_dev, true); | |
1707 | ||
1708 | spin_unlock_irq(&input_dev->event_lock); | |
1709 | ||
1710 | return 0; | |
1711 | } | |
1712 | ||
1713 | static int input_dev_freeze(struct device *dev) | |
1714 | { | |
1715 | struct input_dev *input_dev = to_input_dev(dev); | |
1716 | ||
1717 | spin_lock_irq(&input_dev->event_lock); | |
1718 | ||
1719 | /* | |
1720 | * Keys that are pressed now are unlikely to be | |
1721 | * still pressed when we resume. | |
1722 | */ | |
1723 | input_dev_release_keys(input_dev); | |
1724 | ||
1725 | spin_unlock_irq(&input_dev->event_lock); | |
1726 | ||
1727 | return 0; | |
1728 | } | |
1729 | ||
1730 | static int input_dev_poweroff(struct device *dev) | |
1731 | { | |
1732 | struct input_dev *input_dev = to_input_dev(dev); | |
1733 | ||
1734 | spin_lock_irq(&input_dev->event_lock); | |
1735 | ||
1736 | /* Turn off LEDs and sounds, if any are active. */ | |
1737 | input_dev_toggle(input_dev, false); | |
1738 | ||
1739 | spin_unlock_irq(&input_dev->event_lock); | |
ffd0db97 DT |
1740 | |
1741 | return 0; | |
1742 | } | |
1743 | ||
1744 | static const struct dev_pm_ops input_dev_pm_ops = { | |
1745 | .suspend = input_dev_suspend, | |
1746 | .resume = input_dev_resume, | |
768d9aa5 AM |
1747 | .freeze = input_dev_freeze, |
1748 | .poweroff = input_dev_poweroff, | |
ffd0db97 DT |
1749 | .restore = input_dev_resume, |
1750 | }; | |
1751 | #endif /* CONFIG_PM */ | |
1752 | ||
9657d75c DT |
1753 | static struct device_type input_dev_type = { |
1754 | .groups = input_dev_attr_groups, | |
1755 | .release = input_dev_release, | |
1756 | .uevent = input_dev_uevent, | |
768d9aa5 | 1757 | #ifdef CONFIG_PM_SLEEP |
ffd0db97 DT |
1758 | .pm = &input_dev_pm_ops, |
1759 | #endif | |
9657d75c DT |
1760 | }; |
1761 | ||
2c9ede55 | 1762 | static char *input_devnode(struct device *dev, umode_t *mode) |
aa5ed63e KS |
1763 | { |
1764 | return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev)); | |
1765 | } | |
1766 | ||
ea9f240b | 1767 | struct class input_class = { |
9657d75c | 1768 | .name = "input", |
e454cea2 | 1769 | .devnode = input_devnode, |
d19fbe8a | 1770 | }; |
ca56fe07 | 1771 | EXPORT_SYMBOL_GPL(input_class); |
d19fbe8a | 1772 | |
1447190e DT |
1773 | /** |
1774 | * input_allocate_device - allocate memory for new input device | |
1775 | * | |
2be975c6 | 1776 | * Returns prepared struct input_dev or %NULL. |
1447190e DT |
1777 | * |
1778 | * NOTE: Use input_free_device() to free devices that have not been | |
1779 | * registered; input_unregister_device() should be used for already | |
1780 | * registered devices. | |
1781 | */ | |
d19fbe8a DT |
1782 | struct input_dev *input_allocate_device(void) |
1783 | { | |
9c7d66fa | 1784 | static atomic_t input_no = ATOMIC_INIT(-1); |
d19fbe8a DT |
1785 | struct input_dev *dev; |
1786 | ||
1787 | dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); | |
1788 | if (dev) { | |
9657d75c DT |
1789 | dev->dev.type = &input_dev_type; |
1790 | dev->dev.class = &input_class; | |
1791 | device_initialize(&dev->dev); | |
f60d2b11 | 1792 | mutex_init(&dev->mutex); |
8006479c | 1793 | spin_lock_init(&dev->event_lock); |
a60a71b0 | 1794 | init_timer(&dev->timer); |
d19fbe8a DT |
1795 | INIT_LIST_HEAD(&dev->h_list); |
1796 | INIT_LIST_HEAD(&dev->node); | |
655816e4 | 1797 | |
bf1d50fa | 1798 | dev_set_name(&dev->dev, "input%lu", |
9c7d66fa | 1799 | (unsigned long)atomic_inc_return(&input_no)); |
a60a71b0 | 1800 | |
655816e4 | 1801 | __module_get(THIS_MODULE); |
d19fbe8a DT |
1802 | } |
1803 | ||
1804 | return dev; | |
1805 | } | |
ca56fe07 | 1806 | EXPORT_SYMBOL(input_allocate_device); |
d19fbe8a | 1807 | |
2be975c6 DT |
1808 | struct input_devres { |
1809 | struct input_dev *input; | |
1810 | }; | |
1811 | ||
1812 | static int devm_input_device_match(struct device *dev, void *res, void *data) | |
1813 | { | |
1814 | struct input_devres *devres = res; | |
1815 | ||
1816 | return devres->input == data; | |
1817 | } | |
1818 | ||
1819 | static void devm_input_device_release(struct device *dev, void *res) | |
1820 | { | |
1821 | struct input_devres *devres = res; | |
1822 | struct input_dev *input = devres->input; | |
1823 | ||
1824 | dev_dbg(dev, "%s: dropping reference to %s\n", | |
1825 | __func__, dev_name(&input->dev)); | |
1826 | input_put_device(input); | |
1827 | } | |
1828 | ||
1829 | /** | |
1830 | * devm_input_allocate_device - allocate managed input device | |
1831 | * @dev: device owning the input device being created | |
1832 | * | |
1833 | * Returns prepared struct input_dev or %NULL. | |
1834 | * | |
1835 | * Managed input devices do not need to be explicitly unregistered or | |
1836 | * freed as it will be done automatically when owner device unbinds from | |
1837 | * its driver (or binding fails). Once managed input device is allocated, | |
1838 | * it is ready to be set up and registered in the same fashion as regular | |
1839 | * input device. There are no special devm_input_device_[un]register() | |
b666263b DT |
1840 | * variants, regular ones work with both managed and unmanaged devices, |
1841 | * should you need them. In most cases however, managed input device need | |
1842 | * not be explicitly unregistered or freed. | |
2be975c6 DT |
1843 | * |
1844 | * NOTE: the owner device is set up as parent of input device and users | |
1845 | * should not override it. | |
1846 | */ | |
2be975c6 DT |
1847 | struct input_dev *devm_input_allocate_device(struct device *dev) |
1848 | { | |
1849 | struct input_dev *input; | |
1850 | struct input_devres *devres; | |
1851 | ||
1852 | devres = devres_alloc(devm_input_device_release, | |
1853 | sizeof(struct input_devres), GFP_KERNEL); | |
1854 | if (!devres) | |
1855 | return NULL; | |
1856 | ||
1857 | input = input_allocate_device(); | |
1858 | if (!input) { | |
1859 | devres_free(devres); | |
1860 | return NULL; | |
1861 | } | |
1862 | ||
1863 | input->dev.parent = dev; | |
1864 | input->devres_managed = true; | |
1865 | ||
1866 | devres->input = input; | |
1867 | devres_add(dev, devres); | |
1868 | ||
1869 | return input; | |
1870 | } | |
1871 | EXPORT_SYMBOL(devm_input_allocate_device); | |
1872 | ||
1447190e DT |
1873 | /** |
1874 | * input_free_device - free memory occupied by input_dev structure | |
1875 | * @dev: input device to free | |
1876 | * | |
1877 | * This function should only be used if input_register_device() | |
1878 | * was not called yet or if it failed. Once device was registered | |
1879 | * use input_unregister_device() and memory will be freed once last | |
8006479c | 1880 | * reference to the device is dropped. |
1447190e DT |
1881 | * |
1882 | * Device should be allocated by input_allocate_device(). | |
1883 | * | |
1884 | * NOTE: If there are references to the input device then memory | |
1885 | * will not be freed until last reference is dropped. | |
1886 | */ | |
f60d2b11 DT |
1887 | void input_free_device(struct input_dev *dev) |
1888 | { | |
2be975c6 DT |
1889 | if (dev) { |
1890 | if (dev->devres_managed) | |
1891 | WARN_ON(devres_destroy(dev->dev.parent, | |
1892 | devm_input_device_release, | |
1893 | devm_input_device_match, | |
1894 | dev)); | |
f60d2b11 | 1895 | input_put_device(dev); |
2be975c6 | 1896 | } |
f60d2b11 | 1897 | } |
ca56fe07 | 1898 | EXPORT_SYMBOL(input_free_device); |
f60d2b11 | 1899 | |
534565f2 DT |
1900 | /** |
1901 | * input_set_capability - mark device as capable of a certain event | |
1902 | * @dev: device that is capable of emitting or accepting event | |
1903 | * @type: type of the event (EV_KEY, EV_REL, etc...) | |
1904 | * @code: event code | |
1905 | * | |
1906 | * In addition to setting up corresponding bit in appropriate capability | |
1907 | * bitmap the function also adjusts dev->evbit. | |
1908 | */ | |
1909 | void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code) | |
1910 | { | |
1911 | switch (type) { | |
1912 | case EV_KEY: | |
1913 | __set_bit(code, dev->keybit); | |
1914 | break; | |
1915 | ||
1916 | case EV_REL: | |
1917 | __set_bit(code, dev->relbit); | |
1918 | break; | |
1919 | ||
1920 | case EV_ABS: | |
28a2a2e1 DT |
1921 | input_alloc_absinfo(dev); |
1922 | if (!dev->absinfo) | |
1923 | return; | |
1924 | ||
534565f2 DT |
1925 | __set_bit(code, dev->absbit); |
1926 | break; | |
1927 | ||
1928 | case EV_MSC: | |
1929 | __set_bit(code, dev->mscbit); | |
1930 | break; | |
1931 | ||
1932 | case EV_SW: | |
1933 | __set_bit(code, dev->swbit); | |
1934 | break; | |
1935 | ||
1936 | case EV_LED: | |
1937 | __set_bit(code, dev->ledbit); | |
1938 | break; | |
1939 | ||
1940 | case EV_SND: | |
1941 | __set_bit(code, dev->sndbit); | |
1942 | break; | |
1943 | ||
1944 | case EV_FF: | |
1945 | __set_bit(code, dev->ffbit); | |
1946 | break; | |
1947 | ||
22d1c398 DB |
1948 | case EV_PWR: |
1949 | /* do nothing */ | |
1950 | break; | |
1951 | ||
534565f2 | 1952 | default: |
da0c4901 JP |
1953 | pr_err("input_set_capability: unknown type %u (code %u)\n", |
1954 | type, code); | |
534565f2 DT |
1955 | dump_stack(); |
1956 | return; | |
1957 | } | |
1958 | ||
1959 | __set_bit(type, dev->evbit); | |
1960 | } | |
1961 | EXPORT_SYMBOL(input_set_capability); | |
1962 | ||
80b4895a JB |
1963 | static unsigned int input_estimate_events_per_packet(struct input_dev *dev) |
1964 | { | |
1965 | int mt_slots; | |
1966 | int i; | |
1967 | unsigned int events; | |
1968 | ||
8d18fba2 HR |
1969 | if (dev->mt) { |
1970 | mt_slots = dev->mt->num_slots; | |
80b4895a JB |
1971 | } else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit)) { |
1972 | mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum - | |
1973 | dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1, | |
8c127f07 | 1974 | mt_slots = clamp(mt_slots, 2, 32); |
80b4895a JB |
1975 | } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) { |
1976 | mt_slots = 2; | |
1977 | } else { | |
1978 | mt_slots = 0; | |
1979 | } | |
1980 | ||
1981 | events = mt_slots + 1; /* count SYN_MT_REPORT and SYN_REPORT */ | |
1982 | ||
3e2b03da AG |
1983 | if (test_bit(EV_ABS, dev->evbit)) |
1984 | for_each_set_bit(i, dev->absbit, ABS_CNT) | |
1985 | events += input_is_mt_axis(i) ? mt_slots : 1; | |
80b4895a | 1986 | |
3e2b03da AG |
1987 | if (test_bit(EV_REL, dev->evbit)) |
1988 | events += bitmap_weight(dev->relbit, REL_CNT); | |
80b4895a | 1989 | |
7c75bf99 HR |
1990 | /* Make room for KEY and MSC events */ |
1991 | events += 7; | |
1992 | ||
80b4895a JB |
1993 | return events; |
1994 | } | |
1995 | ||
92a3a587 DT |
1996 | #define INPUT_CLEANSE_BITMASK(dev, type, bits) \ |
1997 | do { \ | |
1998 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1999 | memset(dev->bits##bit, 0, \ | |
2000 | sizeof(dev->bits##bit)); \ | |
2001 | } while (0) | |
2002 | ||
2003 | static void input_cleanse_bitmasks(struct input_dev *dev) | |
2004 | { | |
2005 | INPUT_CLEANSE_BITMASK(dev, KEY, key); | |
2006 | INPUT_CLEANSE_BITMASK(dev, REL, rel); | |
2007 | INPUT_CLEANSE_BITMASK(dev, ABS, abs); | |
2008 | INPUT_CLEANSE_BITMASK(dev, MSC, msc); | |
2009 | INPUT_CLEANSE_BITMASK(dev, LED, led); | |
2010 | INPUT_CLEANSE_BITMASK(dev, SND, snd); | |
2011 | INPUT_CLEANSE_BITMASK(dev, FF, ff); | |
2012 | INPUT_CLEANSE_BITMASK(dev, SW, sw); | |
2013 | } | |
2014 | ||
2be975c6 DT |
2015 | static void __input_unregister_device(struct input_dev *dev) |
2016 | { | |
2017 | struct input_handle *handle, *next; | |
2018 | ||
2019 | input_disconnect_device(dev); | |
2020 | ||
2021 | mutex_lock(&input_mutex); | |
2022 | ||
2023 | list_for_each_entry_safe(handle, next, &dev->h_list, d_node) | |
2024 | handle->handler->disconnect(handle); | |
2025 | WARN_ON(!list_empty(&dev->h_list)); | |
2026 | ||
2027 | del_timer_sync(&dev->timer); | |
2028 | list_del_init(&dev->node); | |
2029 | ||
2030 | input_wakeup_procfs_readers(); | |
2031 | ||
2032 | mutex_unlock(&input_mutex); | |
2033 | ||
2034 | device_del(&dev->dev); | |
2035 | } | |
2036 | ||
2037 | static void devm_input_device_unregister(struct device *dev, void *res) | |
2038 | { | |
2039 | struct input_devres *devres = res; | |
2040 | struct input_dev *input = devres->input; | |
2041 | ||
2042 | dev_dbg(dev, "%s: unregistering device %s\n", | |
2043 | __func__, dev_name(&input->dev)); | |
2044 | __input_unregister_device(input); | |
2045 | } | |
2046 | ||
027c71bb PG |
2047 | /** |
2048 | * input_enable_softrepeat - enable software autorepeat | |
2049 | * @dev: input device | |
2050 | * @delay: repeat delay | |
2051 | * @period: repeat period | |
2052 | * | |
2053 | * Enable software autorepeat on the input device. | |
2054 | */ | |
2055 | void input_enable_softrepeat(struct input_dev *dev, int delay, int period) | |
2056 | { | |
2057 | dev->timer.data = (unsigned long) dev; | |
2058 | dev->timer.function = input_repeat_key; | |
2059 | dev->rep[REP_DELAY] = delay; | |
2060 | dev->rep[REP_PERIOD] = period; | |
2061 | } | |
2062 | EXPORT_SYMBOL(input_enable_softrepeat); | |
2063 | ||
8006479c DT |
2064 | /** |
2065 | * input_register_device - register device with input core | |
2066 | * @dev: device to be registered | |
2067 | * | |
2068 | * This function registers device with input core. The device must be | |
2069 | * allocated with input_allocate_device() and all it's capabilities | |
2070 | * set up before registering. | |
2071 | * If function fails the device must be freed with input_free_device(). | |
2072 | * Once device has been successfully registered it can be unregistered | |
2073 | * with input_unregister_device(); input_free_device() should not be | |
2074 | * called in this case. | |
b666263b DT |
2075 | * |
2076 | * Note that this function is also used to register managed input devices | |
2077 | * (ones allocated with devm_input_allocate_device()). Such managed input | |
2078 | * devices need not be explicitly unregistered or freed, their tear down | |
2079 | * is controlled by the devres infrastructure. It is also worth noting | |
2080 | * that tear down of managed input devices is internally a 2-step process: | |
2081 | * registered managed input device is first unregistered, but stays in | |
2082 | * memory and can still handle input_event() calls (although events will | |
2083 | * not be delivered anywhere). The freeing of managed input device will | |
2084 | * happen later, when devres stack is unwound to the point where device | |
2085 | * allocation was made. | |
8006479c | 2086 | */ |
5f945489 | 2087 | int input_register_device(struct input_dev *dev) |
1da177e4 | 2088 | { |
2be975c6 | 2089 | struct input_devres *devres = NULL; |
1da177e4 | 2090 | struct input_handler *handler; |
7c75bf99 | 2091 | unsigned int packet_size; |
bd0ef235 DT |
2092 | const char *path; |
2093 | int error; | |
1da177e4 | 2094 | |
2be975c6 DT |
2095 | if (dev->devres_managed) { |
2096 | devres = devres_alloc(devm_input_device_unregister, | |
2097 | sizeof(struct input_devres), GFP_KERNEL); | |
2098 | if (!devres) | |
2099 | return -ENOMEM; | |
2100 | ||
2101 | devres->input = dev; | |
2102 | } | |
2103 | ||
4f93df40 | 2104 | /* Every input device generates EV_SYN/SYN_REPORT events. */ |
8006479c | 2105 | __set_bit(EV_SYN, dev->evbit); |
0fbf87ca | 2106 | |
4f93df40 DT |
2107 | /* KEY_RESERVED is not supposed to be transmitted to userspace. */ |
2108 | __clear_bit(KEY_RESERVED, dev->keybit); | |
2109 | ||
92a3a587 DT |
2110 | /* Make sure that bitmasks not mentioned in dev->evbit are clean. */ |
2111 | input_cleanse_bitmasks(dev); | |
2112 | ||
7c75bf99 HR |
2113 | packet_size = input_estimate_events_per_packet(dev); |
2114 | if (dev->hint_events_per_packet < packet_size) | |
2115 | dev->hint_events_per_packet = packet_size; | |
80b4895a | 2116 | |
95079b8a | 2117 | dev->max_vals = dev->hint_events_per_packet + 2; |
4369c64c | 2118 | dev->vals = kcalloc(dev->max_vals, sizeof(*dev->vals), GFP_KERNEL); |
2be975c6 DT |
2119 | if (!dev->vals) { |
2120 | error = -ENOMEM; | |
2121 | goto err_devres_free; | |
2122 | } | |
80b4895a | 2123 | |
1da177e4 LT |
2124 | /* |
2125 | * If delay and period are pre-set by the driver, then autorepeating | |
2126 | * is handled by the driver itself and we don't do it in input.c. | |
2127 | */ | |
027c71bb PG |
2128 | if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) |
2129 | input_enable_softrepeat(dev, 250, 33); | |
1da177e4 | 2130 | |
aebd636b DT |
2131 | if (!dev->getkeycode) |
2132 | dev->getkeycode = input_default_getkeycode; | |
c8e4c772 | 2133 | |
aebd636b DT |
2134 | if (!dev->setkeycode) |
2135 | dev->setkeycode = input_default_setkeycode; | |
c8e4c772 | 2136 | |
9657d75c | 2137 | error = device_add(&dev->dev); |
bd0ef235 | 2138 | if (error) |
2be975c6 | 2139 | goto err_free_vals; |
bd0ef235 | 2140 | |
9657d75c | 2141 | path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
da0c4901 JP |
2142 | pr_info("%s as %s\n", |
2143 | dev->name ? dev->name : "Unspecified device", | |
2144 | path ? path : "N/A"); | |
bd0ef235 | 2145 | kfree(path); |
10204020 | 2146 | |
8006479c | 2147 | error = mutex_lock_interruptible(&input_mutex); |
2be975c6 DT |
2148 | if (error) |
2149 | goto err_device_del; | |
8006479c DT |
2150 | |
2151 | list_add_tail(&dev->node, &input_dev_list); | |
2152 | ||
1da177e4 | 2153 | list_for_each_entry(handler, &input_handler_list, node) |
5b2a0826 | 2154 | input_attach_handler(dev, handler); |
1da177e4 | 2155 | |
f96b434d | 2156 | input_wakeup_procfs_readers(); |
5f945489 | 2157 | |
8006479c DT |
2158 | mutex_unlock(&input_mutex); |
2159 | ||
2be975c6 DT |
2160 | if (dev->devres_managed) { |
2161 | dev_dbg(dev->dev.parent, "%s: registering %s with devres.\n", | |
2162 | __func__, dev_name(&dev->dev)); | |
2163 | devres_add(dev->dev.parent, devres); | |
2164 | } | |
5f945489 | 2165 | return 0; |
2be975c6 DT |
2166 | |
2167 | err_device_del: | |
2168 | device_del(&dev->dev); | |
2169 | err_free_vals: | |
2170 | kfree(dev->vals); | |
2171 | dev->vals = NULL; | |
2172 | err_devres_free: | |
2173 | devres_free(devres); | |
2174 | return error; | |
1da177e4 | 2175 | } |
ca56fe07 | 2176 | EXPORT_SYMBOL(input_register_device); |
1da177e4 | 2177 | |
8006479c DT |
2178 | /** |
2179 | * input_unregister_device - unregister previously registered device | |
2180 | * @dev: device to be unregistered | |
2181 | * | |
2182 | * This function unregisters an input device. Once device is unregistered | |
2183 | * the caller should not try to access it as it may get freed at any moment. | |
2184 | */ | |
1da177e4 LT |
2185 | void input_unregister_device(struct input_dev *dev) |
2186 | { | |
2be975c6 DT |
2187 | if (dev->devres_managed) { |
2188 | WARN_ON(devres_destroy(dev->dev.parent, | |
2189 | devm_input_device_unregister, | |
2190 | devm_input_device_match, | |
2191 | dev)); | |
2192 | __input_unregister_device(dev); | |
2193 | /* | |
2194 | * We do not do input_put_device() here because it will be done | |
2195 | * when 2nd devres fires up. | |
2196 | */ | |
2197 | } else { | |
2198 | __input_unregister_device(dev); | |
2199 | input_put_device(dev); | |
2200 | } | |
1da177e4 | 2201 | } |
ca56fe07 | 2202 | EXPORT_SYMBOL(input_unregister_device); |
1da177e4 | 2203 | |
8006479c DT |
2204 | /** |
2205 | * input_register_handler - register a new input handler | |
2206 | * @handler: handler to be registered | |
2207 | * | |
2208 | * This function registers a new input handler (interface) for input | |
2209 | * devices in the system and attaches it to all input devices that | |
2210 | * are compatible with the handler. | |
2211 | */ | |
4263cf0f | 2212 | int input_register_handler(struct input_handler *handler) |
1da177e4 LT |
2213 | { |
2214 | struct input_dev *dev; | |
7f8d4cad | 2215 | int error; |
8006479c | 2216 | |
7f8d4cad DT |
2217 | error = mutex_lock_interruptible(&input_mutex); |
2218 | if (error) | |
2219 | return error; | |
1da177e4 | 2220 | |
1da177e4 LT |
2221 | INIT_LIST_HEAD(&handler->h_list); |
2222 | ||
1da177e4 LT |
2223 | list_add_tail(&handler->node, &input_handler_list); |
2224 | ||
2225 | list_for_each_entry(dev, &input_dev_list, node) | |
5b2a0826 | 2226 | input_attach_handler(dev, handler); |
1da177e4 | 2227 | |
f96b434d | 2228 | input_wakeup_procfs_readers(); |
8006479c | 2229 | |
8006479c | 2230 | mutex_unlock(&input_mutex); |
7f8d4cad | 2231 | return 0; |
1da177e4 | 2232 | } |
ca56fe07 | 2233 | EXPORT_SYMBOL(input_register_handler); |
1da177e4 | 2234 | |
8006479c DT |
2235 | /** |
2236 | * input_unregister_handler - unregisters an input handler | |
2237 | * @handler: handler to be unregistered | |
2238 | * | |
2239 | * This function disconnects a handler from its input devices and | |
2240 | * removes it from lists of known handlers. | |
2241 | */ | |
1da177e4 LT |
2242 | void input_unregister_handler(struct input_handler *handler) |
2243 | { | |
5b2a0826 | 2244 | struct input_handle *handle, *next; |
1da177e4 | 2245 | |
8006479c DT |
2246 | mutex_lock(&input_mutex); |
2247 | ||
5b2a0826 | 2248 | list_for_each_entry_safe(handle, next, &handler->h_list, h_node) |
1da177e4 | 2249 | handler->disconnect(handle); |
5b2a0826 | 2250 | WARN_ON(!list_empty(&handler->h_list)); |
1da177e4 LT |
2251 | |
2252 | list_del_init(&handler->node); | |
2253 | ||
f96b434d | 2254 | input_wakeup_procfs_readers(); |
8006479c DT |
2255 | |
2256 | mutex_unlock(&input_mutex); | |
1da177e4 | 2257 | } |
ca56fe07 | 2258 | EXPORT_SYMBOL(input_unregister_handler); |
1da177e4 | 2259 | |
66d2a595 DT |
2260 | /** |
2261 | * input_handler_for_each_handle - handle iterator | |
2262 | * @handler: input handler to iterate | |
2263 | * @data: data for the callback | |
2264 | * @fn: function to be called for each handle | |
2265 | * | |
2266 | * Iterate over @bus's list of devices, and call @fn for each, passing | |
2267 | * it @data and stop when @fn returns a non-zero value. The function is | |
ec8beff9 | 2268 | * using RCU to traverse the list and therefore may be using in atomic |
66d2a595 DT |
2269 | * contexts. The @fn callback is invoked from RCU critical section and |
2270 | * thus must not sleep. | |
2271 | */ | |
2272 | int input_handler_for_each_handle(struct input_handler *handler, void *data, | |
2273 | int (*fn)(struct input_handle *, void *)) | |
2274 | { | |
2275 | struct input_handle *handle; | |
2276 | int retval = 0; | |
2277 | ||
2278 | rcu_read_lock(); | |
2279 | ||
2280 | list_for_each_entry_rcu(handle, &handler->h_list, h_node) { | |
2281 | retval = fn(handle, data); | |
2282 | if (retval) | |
2283 | break; | |
2284 | } | |
2285 | ||
2286 | rcu_read_unlock(); | |
2287 | ||
2288 | return retval; | |
2289 | } | |
2290 | EXPORT_SYMBOL(input_handler_for_each_handle); | |
2291 | ||
8006479c DT |
2292 | /** |
2293 | * input_register_handle - register a new input handle | |
2294 | * @handle: handle to register | |
2295 | * | |
2296 | * This function puts a new input handle onto device's | |
2297 | * and handler's lists so that events can flow through | |
2298 | * it once it is opened using input_open_device(). | |
2299 | * | |
2300 | * This function is supposed to be called from handler's | |
2301 | * connect() method. | |
2302 | */ | |
5b2a0826 DT |
2303 | int input_register_handle(struct input_handle *handle) |
2304 | { | |
2305 | struct input_handler *handler = handle->handler; | |
8006479c DT |
2306 | struct input_dev *dev = handle->dev; |
2307 | int error; | |
2308 | ||
2309 | /* | |
2310 | * We take dev->mutex here to prevent race with | |
2311 | * input_release_device(). | |
2312 | */ | |
2313 | error = mutex_lock_interruptible(&dev->mutex); | |
2314 | if (error) | |
2315 | return error; | |
ef7995f4 DT |
2316 | |
2317 | /* | |
2318 | * Filters go to the head of the list, normal handlers | |
2319 | * to the tail. | |
2320 | */ | |
2321 | if (handler->filter) | |
2322 | list_add_rcu(&handle->d_node, &dev->h_list); | |
2323 | else | |
2324 | list_add_tail_rcu(&handle->d_node, &dev->h_list); | |
2325 | ||
8006479c | 2326 | mutex_unlock(&dev->mutex); |
5b2a0826 | 2327 | |
8006479c DT |
2328 | /* |
2329 | * Since we are supposed to be called from ->connect() | |
2330 | * which is mutually exclusive with ->disconnect() | |
2331 | * we can't be racing with input_unregister_handle() | |
2332 | * and so separate lock is not needed here. | |
2333 | */ | |
66d2a595 | 2334 | list_add_tail_rcu(&handle->h_node, &handler->h_list); |
5b2a0826 DT |
2335 | |
2336 | if (handler->start) | |
2337 | handler->start(handle); | |
2338 | ||
2339 | return 0; | |
2340 | } | |
2341 | EXPORT_SYMBOL(input_register_handle); | |
2342 | ||
8006479c DT |
2343 | /** |
2344 | * input_unregister_handle - unregister an input handle | |
2345 | * @handle: handle to unregister | |
2346 | * | |
2347 | * This function removes input handle from device's | |
2348 | * and handler's lists. | |
2349 | * | |
2350 | * This function is supposed to be called from handler's | |
2351 | * disconnect() method. | |
2352 | */ | |
5b2a0826 DT |
2353 | void input_unregister_handle(struct input_handle *handle) |
2354 | { | |
8006479c DT |
2355 | struct input_dev *dev = handle->dev; |
2356 | ||
66d2a595 | 2357 | list_del_rcu(&handle->h_node); |
8006479c DT |
2358 | |
2359 | /* | |
2360 | * Take dev->mutex to prevent race with input_release_device(). | |
2361 | */ | |
2362 | mutex_lock(&dev->mutex); | |
2363 | list_del_rcu(&handle->d_node); | |
2364 | mutex_unlock(&dev->mutex); | |
66d2a595 | 2365 | |
82ba56c2 | 2366 | synchronize_rcu(); |
5b2a0826 DT |
2367 | } |
2368 | EXPORT_SYMBOL(input_unregister_handle); | |
2369 | ||
7f8d4cad DT |
2370 | /** |
2371 | * input_get_new_minor - allocates a new input minor number | |
2372 | * @legacy_base: beginning or the legacy range to be searched | |
2373 | * @legacy_num: size of legacy range | |
2374 | * @allow_dynamic: whether we can also take ID from the dynamic range | |
2375 | * | |
2376 | * This function allocates a new device minor for from input major namespace. | |
2377 | * Caller can request legacy minor by specifying @legacy_base and @legacy_num | |
2378 | * parameters and whether ID can be allocated from dynamic range if there are | |
2379 | * no free IDs in legacy range. | |
2380 | */ | |
2381 | int input_get_new_minor(int legacy_base, unsigned int legacy_num, | |
2382 | bool allow_dynamic) | |
1da177e4 | 2383 | { |
1da177e4 | 2384 | /* |
7f8d4cad DT |
2385 | * This function should be called from input handler's ->connect() |
2386 | * methods, which are serialized with input_mutex, so no additional | |
2387 | * locking is needed here. | |
1da177e4 | 2388 | */ |
7f8d4cad DT |
2389 | if (legacy_base >= 0) { |
2390 | int minor = ida_simple_get(&input_ida, | |
2391 | legacy_base, | |
2392 | legacy_base + legacy_num, | |
2393 | GFP_KERNEL); | |
2394 | if (minor >= 0 || !allow_dynamic) | |
2395 | return minor; | |
1da177e4 | 2396 | } |
2f2177c8 | 2397 | |
7f8d4cad DT |
2398 | return ida_simple_get(&input_ida, |
2399 | INPUT_FIRST_DYNAMIC_DEV, INPUT_MAX_CHAR_DEVICES, | |
2400 | GFP_KERNEL); | |
1da177e4 | 2401 | } |
7f8d4cad | 2402 | EXPORT_SYMBOL(input_get_new_minor); |
1da177e4 | 2403 | |
7f8d4cad DT |
2404 | /** |
2405 | * input_free_minor - release previously allocated minor | |
2406 | * @minor: minor to be released | |
2407 | * | |
2408 | * This function releases previously allocated input minor so that it can be | |
2409 | * reused later. | |
2410 | */ | |
2411 | void input_free_minor(unsigned int minor) | |
2412 | { | |
2413 | ida_simple_remove(&input_ida, minor); | |
2414 | } | |
2415 | EXPORT_SYMBOL(input_free_minor); | |
1da177e4 | 2416 | |
f96b434d | 2417 | static int __init input_init(void) |
1da177e4 | 2418 | { |
f96b434d | 2419 | int err; |
1da177e4 | 2420 | |
ea9f240b | 2421 | err = class_register(&input_class); |
d19fbe8a | 2422 | if (err) { |
da0c4901 | 2423 | pr_err("unable to register input_dev class\n"); |
d19fbe8a DT |
2424 | return err; |
2425 | } | |
2426 | ||
f96b434d DT |
2427 | err = input_proc_init(); |
2428 | if (err) | |
b0fdfebb | 2429 | goto fail1; |
1da177e4 | 2430 | |
7f8d4cad DT |
2431 | err = register_chrdev_region(MKDEV(INPUT_MAJOR, 0), |
2432 | INPUT_MAX_CHAR_DEVICES, "input"); | |
f96b434d | 2433 | if (err) { |
da0c4901 | 2434 | pr_err("unable to register char major %d", INPUT_MAJOR); |
b0fdfebb | 2435 | goto fail2; |
1da177e4 | 2436 | } |
e334016f | 2437 | |
1da177e4 | 2438 | return 0; |
1da177e4 | 2439 | |
b0fdfebb | 2440 | fail2: input_proc_exit(); |
ea9f240b | 2441 | fail1: class_unregister(&input_class); |
f96b434d | 2442 | return err; |
1da177e4 LT |
2443 | } |
2444 | ||
2445 | static void __exit input_exit(void) | |
2446 | { | |
f96b434d | 2447 | input_proc_exit(); |
7f8d4cad DT |
2448 | unregister_chrdev_region(MKDEV(INPUT_MAJOR, 0), |
2449 | INPUT_MAX_CHAR_DEVICES); | |
ea9f240b | 2450 | class_unregister(&input_class); |
1da177e4 LT |
2451 | } |
2452 | ||
2453 | subsys_initcall(input_init); | |
2454 | module_exit(input_exit); |