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> |
47c78e89 | 17 | #include <linux/input/mt.h> |
1da177e4 | 18 | #include <linux/module.h> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
1da177e4 LT |
20 | #include <linux/random.h> |
21 | #include <linux/major.h> | |
22 | #include <linux/proc_fs.h> | |
a99bbaf5 | 23 | #include <linux/sched.h> |
969b21cd | 24 | #include <linux/seq_file.h> |
1da177e4 LT |
25 | #include <linux/poll.h> |
26 | #include <linux/device.h> | |
e676c232 | 27 | #include <linux/mutex.h> |
8006479c | 28 | #include <linux/rcupdate.h> |
15e184af | 29 | #include "input-compat.h" |
1da177e4 LT |
30 | |
31 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>"); | |
32 | MODULE_DESCRIPTION("Input core"); | |
33 | MODULE_LICENSE("GPL"); | |
34 | ||
1da177e4 LT |
35 | #define INPUT_DEVICES 256 |
36 | ||
37 | static LIST_HEAD(input_dev_list); | |
38 | static LIST_HEAD(input_handler_list); | |
39 | ||
8006479c DT |
40 | /* |
41 | * input_mutex protects access to both input_dev_list and input_handler_list. | |
42 | * This also causes input_[un]register_device and input_[un]register_handler | |
43 | * be mutually exclusive which simplifies locking in drivers implementing | |
44 | * input handlers. | |
45 | */ | |
46 | static DEFINE_MUTEX(input_mutex); | |
47 | ||
1da177e4 LT |
48 | static struct input_handler *input_table[8]; |
49 | ||
8006479c DT |
50 | static inline int is_event_supported(unsigned int code, |
51 | unsigned long *bm, unsigned int max) | |
1da177e4 | 52 | { |
8006479c DT |
53 | return code <= max && test_bit(code, bm); |
54 | } | |
1da177e4 | 55 | |
8006479c DT |
56 | static int input_defuzz_abs_event(int value, int old_val, int fuzz) |
57 | { | |
58 | if (fuzz) { | |
59 | if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2) | |
60 | return old_val; | |
1da177e4 | 61 | |
8006479c DT |
62 | if (value > old_val - fuzz && value < old_val + fuzz) |
63 | return (old_val * 3 + value) / 4; | |
1da177e4 | 64 | |
8006479c DT |
65 | if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2) |
66 | return (old_val + value) / 2; | |
67 | } | |
1da177e4 | 68 | |
8006479c DT |
69 | return value; |
70 | } | |
1da177e4 | 71 | |
8006479c | 72 | /* |
ef7995f4 DT |
73 | * Pass event first through all filters and then, if event has not been |
74 | * filtered out, through all open handles. This function is called with | |
82ba56c2 | 75 | * dev->event_lock held and interrupts disabled. |
8006479c DT |
76 | */ |
77 | static void input_pass_event(struct input_dev *dev, | |
5fdbe44d | 78 | struct input_handler *src_handler, |
8006479c DT |
79 | unsigned int type, unsigned int code, int value) |
80 | { | |
ef7995f4 | 81 | struct input_handler *handler; |
82ba56c2 DT |
82 | struct input_handle *handle; |
83 | ||
84 | rcu_read_lock(); | |
1da177e4 | 85 | |
82ba56c2 | 86 | handle = rcu_dereference(dev->grab); |
8006479c DT |
87 | if (handle) |
88 | handle->handler->event(handle, type, code, value); | |
ef7995f4 DT |
89 | else { |
90 | bool filtered = false; | |
91 | ||
92 | list_for_each_entry_rcu(handle, &dev->h_list, d_node) { | |
93 | if (!handle->open) | |
94 | continue; | |
95 | ||
96 | handler = handle->handler; | |
5fdbe44d DT |
97 | |
98 | /* | |
99 | * If this is the handler that injected this | |
100 | * particular event we want to skip it to avoid | |
101 | * filters firing again and again. | |
102 | */ | |
103 | if (handler == src_handler) | |
104 | continue; | |
105 | ||
ef7995f4 DT |
106 | if (!handler->filter) { |
107 | if (filtered) | |
108 | break; | |
109 | ||
110 | handler->event(handle, type, code, value); | |
111 | ||
112 | } else if (handler->filter(handle, type, code, value)) | |
113 | filtered = true; | |
114 | } | |
115 | } | |
116 | ||
82ba56c2 | 117 | rcu_read_unlock(); |
8006479c | 118 | } |
1da177e4 | 119 | |
8006479c DT |
120 | /* |
121 | * Generate software autorepeat event. Note that we take | |
122 | * dev->event_lock here to avoid racing with input_event | |
123 | * which may cause keys get "stuck". | |
124 | */ | |
125 | static void input_repeat_key(unsigned long data) | |
126 | { | |
127 | struct input_dev *dev = (void *) data; | |
128 | unsigned long flags; | |
1da177e4 | 129 | |
8006479c | 130 | spin_lock_irqsave(&dev->event_lock, flags); |
1da177e4 | 131 | |
8006479c DT |
132 | if (test_bit(dev->repeat_key, dev->key) && |
133 | is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) { | |
1da177e4 | 134 | |
5fdbe44d | 135 | input_pass_event(dev, NULL, EV_KEY, dev->repeat_key, 2); |
1da177e4 | 136 | |
8006479c DT |
137 | if (dev->sync) { |
138 | /* | |
139 | * Only send SYN_REPORT if we are not in a middle | |
140 | * of driver parsing a new hardware packet. | |
141 | * Otherwise assume that the driver will send | |
142 | * SYN_REPORT once it's done. | |
143 | */ | |
5fdbe44d | 144 | input_pass_event(dev, NULL, EV_SYN, SYN_REPORT, 1); |
8006479c | 145 | } |
31581066 | 146 | |
8006479c DT |
147 | if (dev->rep[REP_PERIOD]) |
148 | mod_timer(&dev->timer, jiffies + | |
149 | msecs_to_jiffies(dev->rep[REP_PERIOD])); | |
150 | } | |
31581066 | 151 | |
8006479c DT |
152 | spin_unlock_irqrestore(&dev->event_lock, flags); |
153 | } | |
31581066 | 154 | |
8006479c DT |
155 | static void input_start_autorepeat(struct input_dev *dev, int code) |
156 | { | |
157 | if (test_bit(EV_REP, dev->evbit) && | |
158 | dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && | |
159 | dev->timer.data) { | |
160 | dev->repeat_key = code; | |
161 | mod_timer(&dev->timer, | |
162 | jiffies + msecs_to_jiffies(dev->rep[REP_DELAY])); | |
163 | } | |
164 | } | |
31581066 | 165 | |
e7b5c1ef JB |
166 | static void input_stop_autorepeat(struct input_dev *dev) |
167 | { | |
168 | del_timer(&dev->timer); | |
169 | } | |
170 | ||
8006479c DT |
171 | #define INPUT_IGNORE_EVENT 0 |
172 | #define INPUT_PASS_TO_HANDLERS 1 | |
173 | #define INPUT_PASS_TO_DEVICE 2 | |
174 | #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE) | |
1da177e4 | 175 | |
40d007e7 | 176 | static int input_handle_abs_event(struct input_dev *dev, |
5fdbe44d | 177 | struct input_handler *src_handler, |
40d007e7 HR |
178 | unsigned int code, int *pval) |
179 | { | |
180 | bool is_mt_event; | |
181 | int *pold; | |
182 | ||
183 | if (code == ABS_MT_SLOT) { | |
184 | /* | |
185 | * "Stage" the event; we'll flush it later, when we | |
144c0f88 | 186 | * get actual touch data. |
40d007e7 HR |
187 | */ |
188 | if (*pval >= 0 && *pval < dev->mtsize) | |
189 | dev->slot = *pval; | |
190 | ||
191 | return INPUT_IGNORE_EVENT; | |
192 | } | |
193 | ||
194 | is_mt_event = code >= ABS_MT_FIRST && code <= ABS_MT_LAST; | |
195 | ||
196 | if (!is_mt_event) { | |
d31b2865 | 197 | pold = &dev->absinfo[code].value; |
40d007e7 HR |
198 | } else if (dev->mt) { |
199 | struct input_mt_slot *mtslot = &dev->mt[dev->slot]; | |
200 | pold = &mtslot->abs[code - ABS_MT_FIRST]; | |
201 | } else { | |
202 | /* | |
144c0f88 | 203 | * Bypass filtering for multi-touch events when |
40d007e7 HR |
204 | * not employing slots. |
205 | */ | |
206 | pold = NULL; | |
207 | } | |
208 | ||
209 | if (pold) { | |
210 | *pval = input_defuzz_abs_event(*pval, *pold, | |
d31b2865 | 211 | dev->absinfo[code].fuzz); |
40d007e7 HR |
212 | if (*pold == *pval) |
213 | return INPUT_IGNORE_EVENT; | |
214 | ||
215 | *pold = *pval; | |
216 | } | |
217 | ||
218 | /* Flush pending "slot" event */ | |
987a6c02 DM |
219 | if (is_mt_event && dev->slot != input_abs_get_val(dev, ABS_MT_SLOT)) { |
220 | input_abs_set_val(dev, ABS_MT_SLOT, dev->slot); | |
5fdbe44d DT |
221 | input_pass_event(dev, src_handler, |
222 | EV_ABS, ABS_MT_SLOT, dev->slot); | |
40d007e7 HR |
223 | } |
224 | ||
225 | return INPUT_PASS_TO_HANDLERS; | |
226 | } | |
227 | ||
8006479c | 228 | static void input_handle_event(struct input_dev *dev, |
5fdbe44d | 229 | struct input_handler *src_handler, |
8006479c DT |
230 | unsigned int type, unsigned int code, int value) |
231 | { | |
232 | int disposition = INPUT_IGNORE_EVENT; | |
1da177e4 | 233 | |
8006479c | 234 | switch (type) { |
1da177e4 | 235 | |
8006479c DT |
236 | case EV_SYN: |
237 | switch (code) { | |
238 | case SYN_CONFIG: | |
239 | disposition = INPUT_PASS_TO_ALL; | |
240 | break; | |
1da177e4 | 241 | |
8006479c DT |
242 | case SYN_REPORT: |
243 | if (!dev->sync) { | |
20da92de | 244 | dev->sync = true; |
8006479c | 245 | disposition = INPUT_PASS_TO_HANDLERS; |
1da177e4 | 246 | } |
1da177e4 | 247 | break; |
5e5ee686 | 248 | case SYN_MT_REPORT: |
20da92de | 249 | dev->sync = false; |
5e5ee686 HR |
250 | disposition = INPUT_PASS_TO_HANDLERS; |
251 | break; | |
8006479c DT |
252 | } |
253 | break; | |
1da177e4 | 254 | |
8006479c DT |
255 | case EV_KEY: |
256 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
257 | !!test_bit(code, dev->key) != value) { | |
1da177e4 | 258 | |
8006479c DT |
259 | if (value != 2) { |
260 | __change_bit(code, dev->key); | |
261 | if (value) | |
262 | input_start_autorepeat(dev, code); | |
e7b5c1ef JB |
263 | else |
264 | input_stop_autorepeat(dev); | |
8006479c | 265 | } |
1da177e4 | 266 | |
8006479c DT |
267 | disposition = INPUT_PASS_TO_HANDLERS; |
268 | } | |
269 | break; | |
1da177e4 | 270 | |
8006479c DT |
271 | case EV_SW: |
272 | if (is_event_supported(code, dev->swbit, SW_MAX) && | |
273 | !!test_bit(code, dev->sw) != value) { | |
1da177e4 | 274 | |
8006479c DT |
275 | __change_bit(code, dev->sw); |
276 | disposition = INPUT_PASS_TO_HANDLERS; | |
277 | } | |
278 | break; | |
1da177e4 | 279 | |
8006479c | 280 | case EV_ABS: |
40d007e7 | 281 | if (is_event_supported(code, dev->absbit, ABS_MAX)) |
5fdbe44d DT |
282 | disposition = input_handle_abs_event(dev, src_handler, |
283 | code, &value); | |
61994a61 | 284 | |
8006479c | 285 | break; |
1da177e4 | 286 | |
8006479c DT |
287 | case EV_REL: |
288 | if (is_event_supported(code, dev->relbit, REL_MAX) && value) | |
289 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 290 | |
8006479c | 291 | break; |
1e0afb28 | 292 | |
8006479c DT |
293 | case EV_MSC: |
294 | if (is_event_supported(code, dev->mscbit, MSC_MAX)) | |
295 | disposition = INPUT_PASS_TO_ALL; | |
1da177e4 | 296 | |
8006479c | 297 | break; |
1da177e4 | 298 | |
8006479c DT |
299 | case EV_LED: |
300 | if (is_event_supported(code, dev->ledbit, LED_MAX) && | |
301 | !!test_bit(code, dev->led) != value) { | |
1da177e4 | 302 | |
8006479c DT |
303 | __change_bit(code, dev->led); |
304 | disposition = INPUT_PASS_TO_ALL; | |
305 | } | |
306 | break; | |
307 | ||
308 | case EV_SND: | |
309 | if (is_event_supported(code, dev->sndbit, SND_MAX)) { | |
1da177e4 | 310 | |
8fdc1948 | 311 | if (!!test_bit(code, dev->snd) != !!value) |
8006479c DT |
312 | __change_bit(code, dev->snd); |
313 | disposition = INPUT_PASS_TO_ALL; | |
314 | } | |
315 | break; | |
8fdc1948 | 316 | |
8006479c DT |
317 | case EV_REP: |
318 | if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) { | |
319 | dev->rep[code] = value; | |
320 | disposition = INPUT_PASS_TO_ALL; | |
321 | } | |
322 | break; | |
1da177e4 | 323 | |
8006479c DT |
324 | case EV_FF: |
325 | if (value >= 0) | |
326 | disposition = INPUT_PASS_TO_ALL; | |
327 | break; | |
ed2fa4dd RP |
328 | |
329 | case EV_PWR: | |
330 | disposition = INPUT_PASS_TO_ALL; | |
331 | break; | |
8006479c | 332 | } |
1da177e4 | 333 | |
c9812282 | 334 | if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN) |
20da92de | 335 | dev->sync = false; |
1da177e4 | 336 | |
8006479c DT |
337 | if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event) |
338 | dev->event(dev, type, code, value); | |
1da177e4 | 339 | |
8006479c | 340 | if (disposition & INPUT_PASS_TO_HANDLERS) |
5fdbe44d | 341 | input_pass_event(dev, src_handler, type, code, value); |
8006479c | 342 | } |
1da177e4 | 343 | |
8006479c DT |
344 | /** |
345 | * input_event() - report new input event | |
346 | * @dev: device that generated the event | |
347 | * @type: type of the event | |
348 | * @code: event code | |
349 | * @value: value of the event | |
350 | * | |
351 | * This function should be used by drivers implementing various input | |
df2d4637 DT |
352 | * devices to report input events. See also input_inject_event(). |
353 | * | |
354 | * NOTE: input_event() may be safely used right after input device was | |
355 | * allocated with input_allocate_device(), even before it is registered | |
356 | * with input_register_device(), but the event will not reach any of the | |
357 | * input handlers. Such early invocation of input_event() may be used | |
358 | * to 'seed' initial state of a switch or initial position of absolute | |
359 | * axis, etc. | |
8006479c | 360 | */ |
8006479c DT |
361 | void input_event(struct input_dev *dev, |
362 | unsigned int type, unsigned int code, int value) | |
363 | { | |
364 | unsigned long flags; | |
509ca1a9 | 365 | |
8006479c | 366 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
509ca1a9 | 367 | |
8006479c DT |
368 | spin_lock_irqsave(&dev->event_lock, flags); |
369 | add_input_randomness(type, code, value); | |
5fdbe44d | 370 | input_handle_event(dev, NULL, type, code, value); |
8006479c | 371 | spin_unlock_irqrestore(&dev->event_lock, flags); |
1da177e4 | 372 | } |
1da177e4 | 373 | } |
ca56fe07 | 374 | EXPORT_SYMBOL(input_event); |
1da177e4 | 375 | |
0e739d28 DT |
376 | /** |
377 | * input_inject_event() - send input event from input handler | |
378 | * @handle: input handle to send event through | |
379 | * @type: type of the event | |
380 | * @code: event code | |
381 | * @value: value of the event | |
382 | * | |
8006479c DT |
383 | * Similar to input_event() but will ignore event if device is |
384 | * "grabbed" and handle injecting event is not the one that owns | |
385 | * the device. | |
0e739d28 | 386 | */ |
8006479c DT |
387 | void input_inject_event(struct input_handle *handle, |
388 | unsigned int type, unsigned int code, int value) | |
1da177e4 | 389 | { |
8006479c DT |
390 | struct input_dev *dev = handle->dev; |
391 | struct input_handle *grab; | |
392 | unsigned long flags; | |
1da177e4 | 393 | |
8006479c DT |
394 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
395 | spin_lock_irqsave(&dev->event_lock, flags); | |
1da177e4 | 396 | |
82ba56c2 | 397 | rcu_read_lock(); |
8006479c DT |
398 | grab = rcu_dereference(dev->grab); |
399 | if (!grab || grab == handle) | |
5fdbe44d DT |
400 | input_handle_event(dev, handle->handler, |
401 | type, code, value); | |
82ba56c2 | 402 | rcu_read_unlock(); |
1da177e4 | 403 | |
8006479c DT |
404 | spin_unlock_irqrestore(&dev->event_lock, flags); |
405 | } | |
1da177e4 | 406 | } |
8006479c | 407 | EXPORT_SYMBOL(input_inject_event); |
1da177e4 | 408 | |
d31b2865 DM |
409 | /** |
410 | * input_alloc_absinfo - allocates array of input_absinfo structs | |
411 | * @dev: the input device emitting absolute events | |
412 | * | |
413 | * If the absinfo struct the caller asked for is already allocated, this | |
414 | * functions will not do anything. | |
415 | */ | |
416 | void input_alloc_absinfo(struct input_dev *dev) | |
417 | { | |
418 | if (!dev->absinfo) | |
419 | dev->absinfo = kcalloc(ABS_CNT, sizeof(struct input_absinfo), | |
420 | GFP_KERNEL); | |
421 | ||
422 | WARN(!dev->absinfo, "%s(): kcalloc() failed?\n", __func__); | |
423 | } | |
424 | EXPORT_SYMBOL(input_alloc_absinfo); | |
425 | ||
426 | void input_set_abs_params(struct input_dev *dev, unsigned int axis, | |
427 | int min, int max, int fuzz, int flat) | |
428 | { | |
429 | struct input_absinfo *absinfo; | |
430 | ||
431 | input_alloc_absinfo(dev); | |
432 | if (!dev->absinfo) | |
433 | return; | |
434 | ||
435 | absinfo = &dev->absinfo[axis]; | |
436 | absinfo->minimum = min; | |
437 | absinfo->maximum = max; | |
438 | absinfo->fuzz = fuzz; | |
439 | absinfo->flat = flat; | |
440 | ||
441 | dev->absbit[BIT_WORD(axis)] |= BIT_MASK(axis); | |
442 | } | |
443 | EXPORT_SYMBOL(input_set_abs_params); | |
444 | ||
445 | ||
8006479c DT |
446 | /** |
447 | * input_grab_device - grabs device for exclusive use | |
448 | * @handle: input handle that wants to own the device | |
449 | * | |
450 | * When a device is grabbed by an input handle all events generated by | |
451 | * the device are delivered only to this handle. Also events injected | |
452 | * by other input handles are ignored while device is grabbed. | |
453 | */ | |
1da177e4 LT |
454 | int input_grab_device(struct input_handle *handle) |
455 | { | |
8006479c DT |
456 | struct input_dev *dev = handle->dev; |
457 | int retval; | |
1da177e4 | 458 | |
8006479c DT |
459 | retval = mutex_lock_interruptible(&dev->mutex); |
460 | if (retval) | |
461 | return retval; | |
462 | ||
463 | if (dev->grab) { | |
464 | retval = -EBUSY; | |
465 | goto out; | |
466 | } | |
467 | ||
468 | rcu_assign_pointer(dev->grab, handle); | |
82ba56c2 | 469 | synchronize_rcu(); |
8006479c DT |
470 | |
471 | out: | |
472 | mutex_unlock(&dev->mutex); | |
473 | return retval; | |
1da177e4 | 474 | } |
ca56fe07 | 475 | EXPORT_SYMBOL(input_grab_device); |
1da177e4 | 476 | |
8006479c | 477 | static void __input_release_device(struct input_handle *handle) |
1da177e4 | 478 | { |
a2b2ed2c | 479 | struct input_dev *dev = handle->dev; |
c7e8dc6e | 480 | |
a2b2ed2c | 481 | if (dev->grab == handle) { |
8006479c DT |
482 | rcu_assign_pointer(dev->grab, NULL); |
483 | /* Make sure input_pass_event() notices that grab is gone */ | |
82ba56c2 | 484 | synchronize_rcu(); |
a2b2ed2c AM |
485 | |
486 | list_for_each_entry(handle, &dev->h_list, d_node) | |
8006479c | 487 | if (handle->open && handle->handler->start) |
c7e8dc6e DT |
488 | handle->handler->start(handle); |
489 | } | |
1da177e4 | 490 | } |
8006479c DT |
491 | |
492 | /** | |
493 | * input_release_device - release previously grabbed device | |
494 | * @handle: input handle that owns the device | |
495 | * | |
496 | * Releases previously grabbed device so that other input handles can | |
497 | * start receiving input events. Upon release all handlers attached | |
498 | * to the device have their start() method called so they have a change | |
499 | * to synchronize device state with the rest of the system. | |
500 | */ | |
501 | void input_release_device(struct input_handle *handle) | |
502 | { | |
503 | struct input_dev *dev = handle->dev; | |
504 | ||
505 | mutex_lock(&dev->mutex); | |
506 | __input_release_device(handle); | |
507 | mutex_unlock(&dev->mutex); | |
508 | } | |
ca56fe07 | 509 | EXPORT_SYMBOL(input_release_device); |
1da177e4 | 510 | |
8006479c DT |
511 | /** |
512 | * input_open_device - open input device | |
513 | * @handle: handle through which device is being accessed | |
514 | * | |
515 | * This function should be called by input handlers when they | |
516 | * want to start receive events from given input device. | |
517 | */ | |
1da177e4 LT |
518 | int input_open_device(struct input_handle *handle) |
519 | { | |
0fbf87ca | 520 | struct input_dev *dev = handle->dev; |
8006479c | 521 | int retval; |
0fbf87ca | 522 | |
8006479c DT |
523 | retval = mutex_lock_interruptible(&dev->mutex); |
524 | if (retval) | |
525 | return retval; | |
526 | ||
527 | if (dev->going_away) { | |
528 | retval = -ENODEV; | |
529 | goto out; | |
530 | } | |
0fbf87ca | 531 | |
1da177e4 | 532 | handle->open++; |
0fbf87ca DT |
533 | |
534 | if (!dev->users++ && dev->open) | |
8006479c DT |
535 | retval = dev->open(dev); |
536 | ||
537 | if (retval) { | |
538 | dev->users--; | |
539 | if (!--handle->open) { | |
540 | /* | |
541 | * Make sure we are not delivering any more events | |
542 | * through this handle | |
543 | */ | |
82ba56c2 | 544 | synchronize_rcu(); |
8006479c DT |
545 | } |
546 | } | |
0fbf87ca | 547 | |
8006479c | 548 | out: |
e676c232 | 549 | mutex_unlock(&dev->mutex); |
8006479c | 550 | return retval; |
1da177e4 | 551 | } |
ca56fe07 | 552 | EXPORT_SYMBOL(input_open_device); |
1da177e4 | 553 | |
8006479c | 554 | int input_flush_device(struct input_handle *handle, struct file *file) |
1da177e4 | 555 | { |
8006479c DT |
556 | struct input_dev *dev = handle->dev; |
557 | int retval; | |
1da177e4 | 558 | |
8006479c DT |
559 | retval = mutex_lock_interruptible(&dev->mutex); |
560 | if (retval) | |
561 | return retval; | |
562 | ||
563 | if (dev->flush) | |
564 | retval = dev->flush(dev, file); | |
565 | ||
566 | mutex_unlock(&dev->mutex); | |
567 | return retval; | |
1da177e4 | 568 | } |
ca56fe07 | 569 | EXPORT_SYMBOL(input_flush_device); |
1da177e4 | 570 | |
8006479c DT |
571 | /** |
572 | * input_close_device - close input device | |
573 | * @handle: handle through which device is being accessed | |
574 | * | |
575 | * This function should be called by input handlers when they | |
576 | * want to stop receive events from given input device. | |
577 | */ | |
1da177e4 LT |
578 | void input_close_device(struct input_handle *handle) |
579 | { | |
0fbf87ca DT |
580 | struct input_dev *dev = handle->dev; |
581 | ||
e676c232 | 582 | mutex_lock(&dev->mutex); |
0fbf87ca | 583 | |
8006479c DT |
584 | __input_release_device(handle); |
585 | ||
0fbf87ca DT |
586 | if (!--dev->users && dev->close) |
587 | dev->close(dev); | |
8006479c DT |
588 | |
589 | if (!--handle->open) { | |
590 | /* | |
82ba56c2 | 591 | * synchronize_rcu() makes sure that input_pass_event() |
8006479c DT |
592 | * completed and that no more input events are delivered |
593 | * through this handle | |
594 | */ | |
82ba56c2 | 595 | synchronize_rcu(); |
8006479c | 596 | } |
0fbf87ca | 597 | |
e676c232 | 598 | mutex_unlock(&dev->mutex); |
1da177e4 | 599 | } |
ca56fe07 | 600 | EXPORT_SYMBOL(input_close_device); |
1da177e4 | 601 | |
866d7d7b ON |
602 | /* |
603 | * Simulate keyup events for all keys that are marked as pressed. | |
604 | * The function must be called with dev->event_lock held. | |
605 | */ | |
606 | static void input_dev_release_keys(struct input_dev *dev) | |
607 | { | |
608 | int code; | |
609 | ||
610 | if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) { | |
611 | for (code = 0; code <= KEY_MAX; code++) { | |
612 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
613 | __test_and_clear_bit(code, dev->key)) { | |
5fdbe44d | 614 | input_pass_event(dev, NULL, EV_KEY, code, 0); |
866d7d7b ON |
615 | } |
616 | } | |
5fdbe44d | 617 | input_pass_event(dev, NULL, EV_SYN, SYN_REPORT, 1); |
866d7d7b ON |
618 | } |
619 | } | |
620 | ||
8006479c DT |
621 | /* |
622 | * Prepare device for unregistering | |
623 | */ | |
624 | static void input_disconnect_device(struct input_dev *dev) | |
625 | { | |
626 | struct input_handle *handle; | |
8006479c DT |
627 | |
628 | /* | |
629 | * Mark device as going away. Note that we take dev->mutex here | |
630 | * not to protect access to dev->going_away but rather to ensure | |
631 | * that there are no threads in the middle of input_open_device() | |
632 | */ | |
633 | mutex_lock(&dev->mutex); | |
ffd0db97 | 634 | dev->going_away = true; |
8006479c DT |
635 | mutex_unlock(&dev->mutex); |
636 | ||
637 | spin_lock_irq(&dev->event_lock); | |
638 | ||
639 | /* | |
640 | * Simulate keyup events for all pressed keys so that handlers | |
641 | * are not left with "stuck" keys. The driver may continue | |
642 | * generate events even after we done here but they will not | |
643 | * reach any handlers. | |
644 | */ | |
866d7d7b | 645 | input_dev_release_keys(dev); |
8006479c DT |
646 | |
647 | list_for_each_entry(handle, &dev->h_list, d_node) | |
648 | handle->open = 0; | |
649 | ||
650 | spin_unlock_irq(&dev->event_lock); | |
651 | } | |
652 | ||
8613e4c2 MCC |
653 | /** |
654 | * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry | |
655 | * @ke: keymap entry containing scancode to be converted. | |
656 | * @scancode: pointer to the location where converted scancode should | |
657 | * be stored. | |
658 | * | |
659 | * This function is used to convert scancode stored in &struct keymap_entry | |
660 | * into scalar form understood by legacy keymap handling methods. These | |
661 | * methods expect scancodes to be represented as 'unsigned int'. | |
662 | */ | |
663 | int input_scancode_to_scalar(const struct input_keymap_entry *ke, | |
664 | unsigned int *scancode) | |
665 | { | |
666 | switch (ke->len) { | |
667 | case 1: | |
668 | *scancode = *((u8 *)ke->scancode); | |
669 | break; | |
670 | ||
671 | case 2: | |
672 | *scancode = *((u16 *)ke->scancode); | |
673 | break; | |
674 | ||
675 | case 4: | |
676 | *scancode = *((u32 *)ke->scancode); | |
677 | break; | |
678 | ||
679 | default: | |
680 | return -EINVAL; | |
681 | } | |
682 | ||
683 | return 0; | |
684 | } | |
685 | EXPORT_SYMBOL(input_scancode_to_scalar); | |
686 | ||
687 | /* | |
688 | * Those routines handle the default case where no [gs]etkeycode() is | |
689 | * defined. In this case, an array indexed by the scancode is used. | |
690 | */ | |
691 | ||
692 | static unsigned int input_fetch_keycode(struct input_dev *dev, | |
693 | unsigned int index) | |
c8e4c772 MR |
694 | { |
695 | switch (dev->keycodesize) { | |
8613e4c2 MCC |
696 | case 1: |
697 | return ((u8 *)dev->keycode)[index]; | |
c8e4c772 | 698 | |
8613e4c2 MCC |
699 | case 2: |
700 | return ((u16 *)dev->keycode)[index]; | |
c8e4c772 | 701 | |
8613e4c2 MCC |
702 | default: |
703 | return ((u32 *)dev->keycode)[index]; | |
c8e4c772 MR |
704 | } |
705 | } | |
706 | ||
707 | static int input_default_getkeycode(struct input_dev *dev, | |
8613e4c2 | 708 | struct input_keymap_entry *ke) |
c8e4c772 | 709 | { |
8613e4c2 MCC |
710 | unsigned int index; |
711 | int error; | |
712 | ||
c8e4c772 MR |
713 | if (!dev->keycodesize) |
714 | return -EINVAL; | |
715 | ||
8613e4c2 MCC |
716 | if (ke->flags & INPUT_KEYMAP_BY_INDEX) |
717 | index = ke->index; | |
718 | else { | |
719 | error = input_scancode_to_scalar(ke, &index); | |
720 | if (error) | |
721 | return error; | |
722 | } | |
723 | ||
724 | if (index >= dev->keycodemax) | |
c8e4c772 MR |
725 | return -EINVAL; |
726 | ||
8613e4c2 MCC |
727 | ke->keycode = input_fetch_keycode(dev, index); |
728 | ke->index = index; | |
729 | ke->len = sizeof(index); | |
730 | memcpy(ke->scancode, &index, sizeof(index)); | |
c8e4c772 MR |
731 | |
732 | return 0; | |
733 | } | |
734 | ||
735 | static int input_default_setkeycode(struct input_dev *dev, | |
8613e4c2 MCC |
736 | const struct input_keymap_entry *ke, |
737 | unsigned int *old_keycode) | |
c8e4c772 | 738 | { |
8613e4c2 MCC |
739 | unsigned int index; |
740 | int error; | |
c8e4c772 MR |
741 | int i; |
742 | ||
8613e4c2 | 743 | if (!dev->keycodesize) |
c8e4c772 MR |
744 | return -EINVAL; |
745 | ||
8613e4c2 MCC |
746 | if (ke->flags & INPUT_KEYMAP_BY_INDEX) { |
747 | index = ke->index; | |
748 | } else { | |
749 | error = input_scancode_to_scalar(ke, &index); | |
750 | if (error) | |
751 | return error; | |
752 | } | |
753 | ||
754 | if (index >= dev->keycodemax) | |
c8e4c772 MR |
755 | return -EINVAL; |
756 | ||
de391d12 | 757 | if (dev->keycodesize < sizeof(ke->keycode) && |
8613e4c2 | 758 | (ke->keycode >> (dev->keycodesize * 8))) |
c8e4c772 MR |
759 | return -EINVAL; |
760 | ||
761 | switch (dev->keycodesize) { | |
762 | case 1: { | |
763 | u8 *k = (u8 *)dev->keycode; | |
8613e4c2 MCC |
764 | *old_keycode = k[index]; |
765 | k[index] = ke->keycode; | |
c8e4c772 MR |
766 | break; |
767 | } | |
768 | case 2: { | |
769 | u16 *k = (u16 *)dev->keycode; | |
8613e4c2 MCC |
770 | *old_keycode = k[index]; |
771 | k[index] = ke->keycode; | |
c8e4c772 MR |
772 | break; |
773 | } | |
774 | default: { | |
775 | u32 *k = (u32 *)dev->keycode; | |
8613e4c2 MCC |
776 | *old_keycode = k[index]; |
777 | k[index] = ke->keycode; | |
c8e4c772 MR |
778 | break; |
779 | } | |
780 | } | |
781 | ||
8613e4c2 MCC |
782 | __clear_bit(*old_keycode, dev->keybit); |
783 | __set_bit(ke->keycode, dev->keybit); | |
c8e4c772 MR |
784 | |
785 | for (i = 0; i < dev->keycodemax; i++) { | |
8613e4c2 MCC |
786 | if (input_fetch_keycode(dev, i) == *old_keycode) { |
787 | __set_bit(*old_keycode, dev->keybit); | |
c8e4c772 MR |
788 | break; /* Setting the bit twice is useless, so break */ |
789 | } | |
790 | } | |
791 | ||
792 | return 0; | |
793 | } | |
794 | ||
f4f37c8e DT |
795 | /** |
796 | * input_get_keycode - retrieve keycode currently mapped to a given scancode | |
797 | * @dev: input device which keymap is being queried | |
8613e4c2 | 798 | * @ke: keymap entry |
f4f37c8e DT |
799 | * |
800 | * This function should be called by anyone interested in retrieving current | |
8613e4c2 | 801 | * keymap. Presently evdev handlers use it. |
f4f37c8e | 802 | */ |
8613e4c2 | 803 | int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke) |
f4f37c8e | 804 | { |
2e2e3b96 DT |
805 | unsigned long flags; |
806 | int retval; | |
807 | ||
808 | spin_lock_irqsave(&dev->event_lock, flags); | |
aebd636b | 809 | retval = dev->getkeycode(dev, ke); |
8613e4c2 | 810 | spin_unlock_irqrestore(&dev->event_lock, flags); |
aebd636b | 811 | |
2e2e3b96 | 812 | return retval; |
f4f37c8e DT |
813 | } |
814 | EXPORT_SYMBOL(input_get_keycode); | |
815 | ||
816 | /** | |
8613e4c2 | 817 | * input_set_keycode - attribute a keycode to a given scancode |
f4f37c8e | 818 | * @dev: input device which keymap is being updated |
8613e4c2 | 819 | * @ke: new keymap entry |
f4f37c8e DT |
820 | * |
821 | * This function should be called by anyone needing to update current | |
822 | * keymap. Presently keyboard and evdev handlers use it. | |
823 | */ | |
58b93995 | 824 | int input_set_keycode(struct input_dev *dev, |
8613e4c2 | 825 | const struct input_keymap_entry *ke) |
f4f37c8e DT |
826 | { |
827 | unsigned long flags; | |
fd6cf3dd | 828 | unsigned int old_keycode; |
f4f37c8e DT |
829 | int retval; |
830 | ||
8613e4c2 | 831 | if (ke->keycode > KEY_MAX) |
f4f37c8e DT |
832 | return -EINVAL; |
833 | ||
834 | spin_lock_irqsave(&dev->event_lock, flags); | |
835 | ||
aebd636b | 836 | retval = dev->setkeycode(dev, ke, &old_keycode); |
f4f37c8e DT |
837 | if (retval) |
838 | goto out; | |
839 | ||
4f93df40 DT |
840 | /* Make sure KEY_RESERVED did not get enabled. */ |
841 | __clear_bit(KEY_RESERVED, dev->keybit); | |
842 | ||
f4f37c8e DT |
843 | /* |
844 | * Simulate keyup event if keycode is not present | |
845 | * in the keymap anymore | |
846 | */ | |
847 | if (test_bit(EV_KEY, dev->evbit) && | |
848 | !is_event_supported(old_keycode, dev->keybit, KEY_MAX) && | |
849 | __test_and_clear_bit(old_keycode, dev->key)) { | |
850 | ||
5fdbe44d | 851 | input_pass_event(dev, NULL, EV_KEY, old_keycode, 0); |
f4f37c8e | 852 | if (dev->sync) |
5fdbe44d | 853 | input_pass_event(dev, NULL, EV_SYN, SYN_REPORT, 1); |
f4f37c8e DT |
854 | } |
855 | ||
856 | out: | |
857 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
858 | ||
859 | return retval; | |
860 | } | |
861 | EXPORT_SYMBOL(input_set_keycode); | |
c8e4c772 | 862 | |
1da177e4 | 863 | #define MATCH_BIT(bit, max) \ |
7b19ada2 | 864 | for (i = 0; i < BITS_TO_LONGS(max); i++) \ |
1da177e4 LT |
865 | if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \ |
866 | break; \ | |
7b19ada2 | 867 | if (i != BITS_TO_LONGS(max)) \ |
1da177e4 LT |
868 | continue; |
869 | ||
0b7024ac | 870 | static const struct input_device_id *input_match_device(struct input_handler *handler, |
66e66118 | 871 | struct input_dev *dev) |
1da177e4 | 872 | { |
0b7024ac | 873 | const struct input_device_id *id; |
1da177e4 LT |
874 | int i; |
875 | ||
0b7024ac | 876 | for (id = handler->id_table; id->flags || id->driver_info; id++) { |
1da177e4 LT |
877 | |
878 | if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) | |
ddc5d341 | 879 | if (id->bustype != dev->id.bustype) |
1da177e4 LT |
880 | continue; |
881 | ||
882 | if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) | |
ddc5d341 | 883 | if (id->vendor != dev->id.vendor) |
1da177e4 LT |
884 | continue; |
885 | ||
886 | if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) | |
ddc5d341 | 887 | if (id->product != dev->id.product) |
1da177e4 LT |
888 | continue; |
889 | ||
890 | if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) | |
ddc5d341 | 891 | if (id->version != dev->id.version) |
1da177e4 LT |
892 | continue; |
893 | ||
894 | MATCH_BIT(evbit, EV_MAX); | |
895 | MATCH_BIT(keybit, KEY_MAX); | |
896 | MATCH_BIT(relbit, REL_MAX); | |
897 | MATCH_BIT(absbit, ABS_MAX); | |
898 | MATCH_BIT(mscbit, MSC_MAX); | |
899 | MATCH_BIT(ledbit, LED_MAX); | |
900 | MATCH_BIT(sndbit, SND_MAX); | |
901 | MATCH_BIT(ffbit, FF_MAX); | |
ff13f98b | 902 | MATCH_BIT(swbit, SW_MAX); |
1da177e4 | 903 | |
0b7024ac DT |
904 | if (!handler->match || handler->match(handler, dev)) |
905 | return id; | |
1da177e4 LT |
906 | } |
907 | ||
908 | return NULL; | |
909 | } | |
910 | ||
5b2a0826 DT |
911 | static int input_attach_handler(struct input_dev *dev, struct input_handler *handler) |
912 | { | |
913 | const struct input_device_id *id; | |
914 | int error; | |
915 | ||
0b7024ac | 916 | id = input_match_device(handler, dev); |
5b2a0826 DT |
917 | if (!id) |
918 | return -ENODEV; | |
919 | ||
920 | error = handler->connect(handler, dev, id); | |
921 | if (error && error != -ENODEV) | |
da0c4901 JP |
922 | pr_err("failed to attach handler %s to device %s, error: %d\n", |
923 | handler->name, kobject_name(&dev->dev.kobj), error); | |
5b2a0826 DT |
924 | |
925 | return error; | |
926 | } | |
927 | ||
15e184af DT |
928 | #ifdef CONFIG_COMPAT |
929 | ||
930 | static int input_bits_to_string(char *buf, int buf_size, | |
931 | unsigned long bits, bool skip_empty) | |
932 | { | |
933 | int len = 0; | |
934 | ||
935 | if (INPUT_COMPAT_TEST) { | |
936 | u32 dword = bits >> 32; | |
937 | if (dword || !skip_empty) | |
938 | len += snprintf(buf, buf_size, "%x ", dword); | |
939 | ||
940 | dword = bits & 0xffffffffUL; | |
941 | if (dword || !skip_empty || len) | |
942 | len += snprintf(buf + len, max(buf_size - len, 0), | |
943 | "%x", dword); | |
944 | } else { | |
945 | if (bits || !skip_empty) | |
946 | len += snprintf(buf, buf_size, "%lx", bits); | |
947 | } | |
948 | ||
949 | return len; | |
950 | } | |
951 | ||
952 | #else /* !CONFIG_COMPAT */ | |
953 | ||
954 | static int input_bits_to_string(char *buf, int buf_size, | |
955 | unsigned long bits, bool skip_empty) | |
956 | { | |
957 | return bits || !skip_empty ? | |
958 | snprintf(buf, buf_size, "%lx", bits) : 0; | |
959 | } | |
960 | ||
961 | #endif | |
5b2a0826 | 962 | |
f96b434d DT |
963 | #ifdef CONFIG_PROC_FS |
964 | ||
965 | static struct proc_dir_entry *proc_bus_input_dir; | |
966 | static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); | |
967 | static int input_devices_state; | |
968 | ||
969 | static inline void input_wakeup_procfs_readers(void) | |
970 | { | |
971 | input_devices_state++; | |
972 | wake_up(&input_devices_poll_wait); | |
973 | } | |
974 | ||
969b21cd | 975 | static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait) |
f96b434d | 976 | { |
f96b434d | 977 | poll_wait(file, &input_devices_poll_wait, wait); |
fa886612 DT |
978 | if (file->f_version != input_devices_state) { |
979 | file->f_version = input_devices_state; | |
f96b434d | 980 | return POLLIN | POLLRDNORM; |
fa886612 | 981 | } |
1e0afb28 | 982 | |
f96b434d DT |
983 | return 0; |
984 | } | |
985 | ||
1572ca2a DT |
986 | union input_seq_state { |
987 | struct { | |
988 | unsigned short pos; | |
989 | bool mutex_acquired; | |
990 | }; | |
991 | void *p; | |
992 | }; | |
993 | ||
969b21cd DT |
994 | static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) |
995 | { | |
1572ca2a DT |
996 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
997 | int error; | |
998 | ||
999 | /* We need to fit into seq->private pointer */ | |
1000 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
1001 | ||
1002 | error = mutex_lock_interruptible(&input_mutex); | |
1003 | if (error) { | |
1004 | state->mutex_acquired = false; | |
1005 | return ERR_PTR(error); | |
1006 | } | |
1007 | ||
1008 | state->mutex_acquired = true; | |
f96b434d | 1009 | |
ad5d972c | 1010 | return seq_list_start(&input_dev_list, *pos); |
969b21cd | 1011 | } |
051b2fea | 1012 | |
969b21cd DT |
1013 | static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1014 | { | |
ad5d972c | 1015 | return seq_list_next(v, &input_dev_list, pos); |
969b21cd | 1016 | } |
f96b434d | 1017 | |
1572ca2a | 1018 | static void input_seq_stop(struct seq_file *seq, void *v) |
969b21cd | 1019 | { |
1572ca2a DT |
1020 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1021 | ||
1022 | if (state->mutex_acquired) | |
1023 | mutex_unlock(&input_mutex); | |
969b21cd | 1024 | } |
f96b434d | 1025 | |
969b21cd DT |
1026 | static void input_seq_print_bitmap(struct seq_file *seq, const char *name, |
1027 | unsigned long *bitmap, int max) | |
1028 | { | |
1029 | int i; | |
15e184af DT |
1030 | bool skip_empty = true; |
1031 | char buf[18]; | |
f96b434d | 1032 | |
969b21cd | 1033 | seq_printf(seq, "B: %s=", name); |
15e184af DT |
1034 | |
1035 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
1036 | if (input_bits_to_string(buf, sizeof(buf), | |
1037 | bitmap[i], skip_empty)) { | |
1038 | skip_empty = false; | |
1039 | seq_printf(seq, "%s%s", buf, i > 0 ? " " : ""); | |
1040 | } | |
1041 | } | |
1042 | ||
1043 | /* | |
1044 | * If no output was produced print a single 0. | |
1045 | */ | |
1046 | if (skip_empty) | |
1047 | seq_puts(seq, "0"); | |
1048 | ||
969b21cd DT |
1049 | seq_putc(seq, '\n'); |
1050 | } | |
f96b434d | 1051 | |
969b21cd DT |
1052 | static int input_devices_seq_show(struct seq_file *seq, void *v) |
1053 | { | |
1054 | struct input_dev *dev = container_of(v, struct input_dev, node); | |
9657d75c | 1055 | const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
969b21cd DT |
1056 | struct input_handle *handle; |
1057 | ||
1058 | seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", | |
1059 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); | |
1060 | ||
1061 | seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); | |
1062 | seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : ""); | |
1063 | seq_printf(seq, "S: Sysfs=%s\n", path ? path : ""); | |
15e03ae8 | 1064 | seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : ""); |
969b21cd DT |
1065 | seq_printf(seq, "H: Handlers="); |
1066 | ||
1067 | list_for_each_entry(handle, &dev->h_list, d_node) | |
1068 | seq_printf(seq, "%s ", handle->name); | |
1069 | seq_putc(seq, '\n'); | |
1070 | ||
85b77200 HR |
1071 | input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX); |
1072 | ||
969b21cd DT |
1073 | input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); |
1074 | if (test_bit(EV_KEY, dev->evbit)) | |
1075 | input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); | |
1076 | if (test_bit(EV_REL, dev->evbit)) | |
1077 | input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); | |
1078 | if (test_bit(EV_ABS, dev->evbit)) | |
1079 | input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); | |
1080 | if (test_bit(EV_MSC, dev->evbit)) | |
1081 | input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); | |
1082 | if (test_bit(EV_LED, dev->evbit)) | |
1083 | input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); | |
1084 | if (test_bit(EV_SND, dev->evbit)) | |
1085 | input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); | |
1086 | if (test_bit(EV_FF, dev->evbit)) | |
1087 | input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); | |
1088 | if (test_bit(EV_SW, dev->evbit)) | |
1089 | input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); | |
1090 | ||
1091 | seq_putc(seq, '\n'); | |
1092 | ||
1093 | kfree(path); | |
1094 | return 0; | |
f96b434d DT |
1095 | } |
1096 | ||
cec69c37 | 1097 | static const struct seq_operations input_devices_seq_ops = { |
969b21cd DT |
1098 | .start = input_devices_seq_start, |
1099 | .next = input_devices_seq_next, | |
1572ca2a | 1100 | .stop = input_seq_stop, |
969b21cd DT |
1101 | .show = input_devices_seq_show, |
1102 | }; | |
1103 | ||
1104 | static int input_proc_devices_open(struct inode *inode, struct file *file) | |
f96b434d | 1105 | { |
969b21cd DT |
1106 | return seq_open(file, &input_devices_seq_ops); |
1107 | } | |
1108 | ||
2b8693c0 | 1109 | static const struct file_operations input_devices_fileops = { |
969b21cd DT |
1110 | .owner = THIS_MODULE, |
1111 | .open = input_proc_devices_open, | |
1112 | .poll = input_proc_devices_poll, | |
1113 | .read = seq_read, | |
1114 | .llseek = seq_lseek, | |
1115 | .release = seq_release, | |
1116 | }; | |
1117 | ||
1118 | static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) | |
1119 | { | |
1572ca2a DT |
1120 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1121 | int error; | |
1122 | ||
1123 | /* We need to fit into seq->private pointer */ | |
1124 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
1125 | ||
1126 | error = mutex_lock_interruptible(&input_mutex); | |
1127 | if (error) { | |
1128 | state->mutex_acquired = false; | |
1129 | return ERR_PTR(error); | |
1130 | } | |
1131 | ||
1132 | state->mutex_acquired = true; | |
1133 | state->pos = *pos; | |
8006479c | 1134 | |
ad5d972c | 1135 | return seq_list_start(&input_handler_list, *pos); |
969b21cd | 1136 | } |
f96b434d | 1137 | |
969b21cd DT |
1138 | static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1139 | { | |
1572ca2a | 1140 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
f96b434d | 1141 | |
1572ca2a DT |
1142 | state->pos = *pos + 1; |
1143 | return seq_list_next(v, &input_handler_list, pos); | |
969b21cd DT |
1144 | } |
1145 | ||
1146 | static int input_handlers_seq_show(struct seq_file *seq, void *v) | |
1147 | { | |
1148 | struct input_handler *handler = container_of(v, struct input_handler, node); | |
1572ca2a | 1149 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
969b21cd | 1150 | |
1572ca2a | 1151 | seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name); |
ef7995f4 DT |
1152 | if (handler->filter) |
1153 | seq_puts(seq, " (filter)"); | |
969b21cd DT |
1154 | if (handler->fops) |
1155 | seq_printf(seq, " Minor=%d", handler->minor); | |
1156 | seq_putc(seq, '\n'); | |
1157 | ||
1158 | return 0; | |
1159 | } | |
1572ca2a | 1160 | |
cec69c37 | 1161 | static const struct seq_operations input_handlers_seq_ops = { |
969b21cd DT |
1162 | .start = input_handlers_seq_start, |
1163 | .next = input_handlers_seq_next, | |
1572ca2a | 1164 | .stop = input_seq_stop, |
969b21cd DT |
1165 | .show = input_handlers_seq_show, |
1166 | }; | |
1167 | ||
1168 | static int input_proc_handlers_open(struct inode *inode, struct file *file) | |
1169 | { | |
1170 | return seq_open(file, &input_handlers_seq_ops); | |
1171 | } | |
1172 | ||
2b8693c0 | 1173 | static const struct file_operations input_handlers_fileops = { |
969b21cd DT |
1174 | .owner = THIS_MODULE, |
1175 | .open = input_proc_handlers_open, | |
1176 | .read = seq_read, | |
1177 | .llseek = seq_lseek, | |
1178 | .release = seq_release, | |
1179 | }; | |
f96b434d DT |
1180 | |
1181 | static int __init input_proc_init(void) | |
1182 | { | |
1183 | struct proc_dir_entry *entry; | |
1184 | ||
9c37066d | 1185 | proc_bus_input_dir = proc_mkdir("bus/input", NULL); |
f96b434d DT |
1186 | if (!proc_bus_input_dir) |
1187 | return -ENOMEM; | |
1188 | ||
c7705f34 DL |
1189 | entry = proc_create("devices", 0, proc_bus_input_dir, |
1190 | &input_devices_fileops); | |
f96b434d DT |
1191 | if (!entry) |
1192 | goto fail1; | |
1193 | ||
c7705f34 DL |
1194 | entry = proc_create("handlers", 0, proc_bus_input_dir, |
1195 | &input_handlers_fileops); | |
f96b434d DT |
1196 | if (!entry) |
1197 | goto fail2; | |
1198 | ||
f96b434d DT |
1199 | return 0; |
1200 | ||
1201 | fail2: remove_proc_entry("devices", proc_bus_input_dir); | |
9c37066d | 1202 | fail1: remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1203 | return -ENOMEM; |
1204 | } | |
1205 | ||
beffbdc2 | 1206 | static void input_proc_exit(void) |
f96b434d DT |
1207 | { |
1208 | remove_proc_entry("devices", proc_bus_input_dir); | |
1209 | remove_proc_entry("handlers", proc_bus_input_dir); | |
9c37066d | 1210 | remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1211 | } |
1212 | ||
1213 | #else /* !CONFIG_PROC_FS */ | |
1214 | static inline void input_wakeup_procfs_readers(void) { } | |
1215 | static inline int input_proc_init(void) { return 0; } | |
1216 | static inline void input_proc_exit(void) { } | |
1217 | #endif | |
1218 | ||
9657d75c DT |
1219 | #define INPUT_DEV_STRING_ATTR_SHOW(name) \ |
1220 | static ssize_t input_dev_show_##name(struct device *dev, \ | |
1221 | struct device_attribute *attr, \ | |
1222 | char *buf) \ | |
1223 | { \ | |
1224 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1225 | \ | |
1226 | return scnprintf(buf, PAGE_SIZE, "%s\n", \ | |
1227 | input_dev->name ? input_dev->name : ""); \ | |
1228 | } \ | |
1229 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL) | |
5c1e9a6a DT |
1230 | |
1231 | INPUT_DEV_STRING_ATTR_SHOW(name); | |
1232 | INPUT_DEV_STRING_ATTR_SHOW(phys); | |
1233 | INPUT_DEV_STRING_ATTR_SHOW(uniq); | |
1234 | ||
ac648a6a DT |
1235 | static int input_print_modalias_bits(char *buf, int size, |
1236 | char name, unsigned long *bm, | |
1237 | unsigned int min_bit, unsigned int max_bit) | |
1d8f430c | 1238 | { |
ac648a6a | 1239 | int len = 0, i; |
1d8f430c | 1240 | |
ac648a6a DT |
1241 | len += snprintf(buf, max(size, 0), "%c", name); |
1242 | for (i = min_bit; i < max_bit; i++) | |
7b19ada2 | 1243 | if (bm[BIT_WORD(i)] & BIT_MASK(i)) |
ac648a6a | 1244 | len += snprintf(buf + len, max(size - len, 0), "%X,", i); |
1d8f430c RR |
1245 | return len; |
1246 | } | |
1247 | ||
2db66876 DT |
1248 | static int input_print_modalias(char *buf, int size, struct input_dev *id, |
1249 | int add_cr) | |
1d8f430c | 1250 | { |
bd37e5a9 | 1251 | int len; |
1d8f430c | 1252 | |
ac648a6a DT |
1253 | len = snprintf(buf, max(size, 0), |
1254 | "input:b%04Xv%04Xp%04Xe%04X-", | |
1255 | id->id.bustype, id->id.vendor, | |
1256 | id->id.product, id->id.version); | |
1257 | ||
1258 | len += input_print_modalias_bits(buf + len, size - len, | |
1259 | 'e', id->evbit, 0, EV_MAX); | |
1260 | len += input_print_modalias_bits(buf + len, size - len, | |
1261 | 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); | |
1262 | len += input_print_modalias_bits(buf + len, size - len, | |
1263 | 'r', id->relbit, 0, REL_MAX); | |
1264 | len += input_print_modalias_bits(buf + len, size - len, | |
1265 | 'a', id->absbit, 0, ABS_MAX); | |
1266 | len += input_print_modalias_bits(buf + len, size - len, | |
1267 | 'm', id->mscbit, 0, MSC_MAX); | |
1268 | len += input_print_modalias_bits(buf + len, size - len, | |
1269 | 'l', id->ledbit, 0, LED_MAX); | |
1270 | len += input_print_modalias_bits(buf + len, size - len, | |
1271 | 's', id->sndbit, 0, SND_MAX); | |
1272 | len += input_print_modalias_bits(buf + len, size - len, | |
1273 | 'f', id->ffbit, 0, FF_MAX); | |
1274 | len += input_print_modalias_bits(buf + len, size - len, | |
1275 | 'w', id->swbit, 0, SW_MAX); | |
2db66876 DT |
1276 | |
1277 | if (add_cr) | |
ac648a6a | 1278 | len += snprintf(buf + len, max(size - len, 0), "\n"); |
2db66876 | 1279 | |
bd37e5a9 KS |
1280 | return len; |
1281 | } | |
1282 | ||
9657d75c DT |
1283 | static ssize_t input_dev_show_modalias(struct device *dev, |
1284 | struct device_attribute *attr, | |
1285 | char *buf) | |
bd37e5a9 KS |
1286 | { |
1287 | struct input_dev *id = to_input_dev(dev); | |
1288 | ssize_t len; | |
1289 | ||
2db66876 DT |
1290 | len = input_print_modalias(buf, PAGE_SIZE, id, 1); |
1291 | ||
8a3cf456 | 1292 | return min_t(int, len, PAGE_SIZE); |
1d8f430c | 1293 | } |
9657d75c | 1294 | static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); |
1d8f430c | 1295 | |
85b77200 HR |
1296 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1297 | int max, int add_cr); | |
1298 | ||
1299 | static ssize_t input_dev_show_properties(struct device *dev, | |
1300 | struct device_attribute *attr, | |
1301 | char *buf) | |
1302 | { | |
1303 | struct input_dev *input_dev = to_input_dev(dev); | |
1304 | int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit, | |
1305 | INPUT_PROP_MAX, true); | |
1306 | return min_t(int, len, PAGE_SIZE); | |
1307 | } | |
1308 | static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL); | |
1309 | ||
629b77a4 | 1310 | static struct attribute *input_dev_attrs[] = { |
9657d75c DT |
1311 | &dev_attr_name.attr, |
1312 | &dev_attr_phys.attr, | |
1313 | &dev_attr_uniq.attr, | |
1314 | &dev_attr_modalias.attr, | |
85b77200 | 1315 | &dev_attr_properties.attr, |
629b77a4 GKH |
1316 | NULL |
1317 | }; | |
1318 | ||
bd0ef235 | 1319 | static struct attribute_group input_dev_attr_group = { |
629b77a4 | 1320 | .attrs = input_dev_attrs, |
5c1e9a6a DT |
1321 | }; |
1322 | ||
9657d75c DT |
1323 | #define INPUT_DEV_ID_ATTR(name) \ |
1324 | static ssize_t input_dev_show_id_##name(struct device *dev, \ | |
1325 | struct device_attribute *attr, \ | |
1326 | char *buf) \ | |
1327 | { \ | |
1328 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1329 | return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \ | |
1330 | } \ | |
1331 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL) | |
5c1e9a6a DT |
1332 | |
1333 | INPUT_DEV_ID_ATTR(bustype); | |
1334 | INPUT_DEV_ID_ATTR(vendor); | |
1335 | INPUT_DEV_ID_ATTR(product); | |
1336 | INPUT_DEV_ID_ATTR(version); | |
1337 | ||
1338 | static struct attribute *input_dev_id_attrs[] = { | |
9657d75c DT |
1339 | &dev_attr_bustype.attr, |
1340 | &dev_attr_vendor.attr, | |
1341 | &dev_attr_product.attr, | |
1342 | &dev_attr_version.attr, | |
5c1e9a6a DT |
1343 | NULL |
1344 | }; | |
1345 | ||
1346 | static struct attribute_group input_dev_id_attr_group = { | |
1347 | .name = "id", | |
1348 | .attrs = input_dev_id_attrs, | |
1349 | }; | |
1350 | ||
969b21cd DT |
1351 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1352 | int max, int add_cr) | |
1353 | { | |
1354 | int i; | |
1355 | int len = 0; | |
15e184af DT |
1356 | bool skip_empty = true; |
1357 | ||
1358 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
1359 | len += input_bits_to_string(buf + len, max(buf_size - len, 0), | |
1360 | bitmap[i], skip_empty); | |
1361 | if (len) { | |
1362 | skip_empty = false; | |
1363 | if (i > 0) | |
1364 | len += snprintf(buf + len, max(buf_size - len, 0), " "); | |
1365 | } | |
1366 | } | |
969b21cd | 1367 | |
15e184af DT |
1368 | /* |
1369 | * If no output was produced print a single 0. | |
1370 | */ | |
1371 | if (len == 0) | |
1372 | len = snprintf(buf, buf_size, "%d", 0); | |
969b21cd DT |
1373 | |
1374 | if (add_cr) | |
1375 | len += snprintf(buf + len, max(buf_size - len, 0), "\n"); | |
1376 | ||
1377 | return len; | |
1378 | } | |
1379 | ||
9657d75c DT |
1380 | #define INPUT_DEV_CAP_ATTR(ev, bm) \ |
1381 | static ssize_t input_dev_show_cap_##bm(struct device *dev, \ | |
1382 | struct device_attribute *attr, \ | |
1383 | char *buf) \ | |
1384 | { \ | |
1385 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1386 | int len = input_print_bitmap(buf, PAGE_SIZE, \ | |
15e184af DT |
1387 | input_dev->bm##bit, ev##_MAX, \ |
1388 | true); \ | |
9657d75c DT |
1389 | return min_t(int, len, PAGE_SIZE); \ |
1390 | } \ | |
1391 | static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL) | |
5c1e9a6a DT |
1392 | |
1393 | INPUT_DEV_CAP_ATTR(EV, ev); | |
1394 | INPUT_DEV_CAP_ATTR(KEY, key); | |
1395 | INPUT_DEV_CAP_ATTR(REL, rel); | |
1396 | INPUT_DEV_CAP_ATTR(ABS, abs); | |
1397 | INPUT_DEV_CAP_ATTR(MSC, msc); | |
1398 | INPUT_DEV_CAP_ATTR(LED, led); | |
1399 | INPUT_DEV_CAP_ATTR(SND, snd); | |
1400 | INPUT_DEV_CAP_ATTR(FF, ff); | |
1401 | INPUT_DEV_CAP_ATTR(SW, sw); | |
1402 | ||
1403 | static struct attribute *input_dev_caps_attrs[] = { | |
9657d75c DT |
1404 | &dev_attr_ev.attr, |
1405 | &dev_attr_key.attr, | |
1406 | &dev_attr_rel.attr, | |
1407 | &dev_attr_abs.attr, | |
1408 | &dev_attr_msc.attr, | |
1409 | &dev_attr_led.attr, | |
1410 | &dev_attr_snd.attr, | |
1411 | &dev_attr_ff.attr, | |
1412 | &dev_attr_sw.attr, | |
5c1e9a6a DT |
1413 | NULL |
1414 | }; | |
1415 | ||
1416 | static struct attribute_group input_dev_caps_attr_group = { | |
1417 | .name = "capabilities", | |
1418 | .attrs = input_dev_caps_attrs, | |
1419 | }; | |
1420 | ||
a4dbd674 | 1421 | static const struct attribute_group *input_dev_attr_groups[] = { |
cb9def4d DT |
1422 | &input_dev_attr_group, |
1423 | &input_dev_id_attr_group, | |
1424 | &input_dev_caps_attr_group, | |
1425 | NULL | |
1426 | }; | |
1427 | ||
9657d75c | 1428 | static void input_dev_release(struct device *device) |
d19fbe8a | 1429 | { |
9657d75c | 1430 | struct input_dev *dev = to_input_dev(device); |
d19fbe8a | 1431 | |
509ca1a9 | 1432 | input_ff_destroy(dev); |
40d007e7 | 1433 | input_mt_destroy_slots(dev); |
d31b2865 | 1434 | kfree(dev->absinfo); |
d19fbe8a | 1435 | kfree(dev); |
509ca1a9 | 1436 | |
d19fbe8a DT |
1437 | module_put(THIS_MODULE); |
1438 | } | |
1439 | ||
a7fadbe1 | 1440 | /* |
312c004d | 1441 | * Input uevent interface - loading event handlers based on |
a7fadbe1 DT |
1442 | * device bitfields. |
1443 | */ | |
7eff2e7a | 1444 | static int input_add_uevent_bm_var(struct kobj_uevent_env *env, |
ac648a6a | 1445 | const char *name, unsigned long *bitmap, int max) |
a7fadbe1 | 1446 | { |
7eff2e7a | 1447 | int len; |
a7fadbe1 | 1448 | |
fcd3027a | 1449 | if (add_uevent_var(env, "%s", name)) |
a7fadbe1 DT |
1450 | return -ENOMEM; |
1451 | ||
7eff2e7a KS |
1452 | len = input_print_bitmap(&env->buf[env->buflen - 1], |
1453 | sizeof(env->buf) - env->buflen, | |
15e184af | 1454 | bitmap, max, false); |
7eff2e7a | 1455 | if (len >= (sizeof(env->buf) - env->buflen)) |
a7fadbe1 DT |
1456 | return -ENOMEM; |
1457 | ||
7eff2e7a | 1458 | env->buflen += len; |
a7fadbe1 DT |
1459 | return 0; |
1460 | } | |
1461 | ||
7eff2e7a | 1462 | static int input_add_uevent_modalias_var(struct kobj_uevent_env *env, |
ac648a6a DT |
1463 | struct input_dev *dev) |
1464 | { | |
7eff2e7a | 1465 | int len; |
ac648a6a | 1466 | |
7eff2e7a | 1467 | if (add_uevent_var(env, "MODALIAS=")) |
ac648a6a DT |
1468 | return -ENOMEM; |
1469 | ||
7eff2e7a KS |
1470 | len = input_print_modalias(&env->buf[env->buflen - 1], |
1471 | sizeof(env->buf) - env->buflen, | |
1472 | dev, 0); | |
1473 | if (len >= (sizeof(env->buf) - env->buflen)) | |
ac648a6a DT |
1474 | return -ENOMEM; |
1475 | ||
7eff2e7a | 1476 | env->buflen += len; |
ac648a6a DT |
1477 | return 0; |
1478 | } | |
1479 | ||
a7fadbe1 DT |
1480 | #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \ |
1481 | do { \ | |
7eff2e7a | 1482 | int err = add_uevent_var(env, fmt, val); \ |
a7fadbe1 DT |
1483 | if (err) \ |
1484 | return err; \ | |
1485 | } while (0) | |
1486 | ||
1487 | #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \ | |
1488 | do { \ | |
7eff2e7a | 1489 | int err = input_add_uevent_bm_var(env, name, bm, max); \ |
a7fadbe1 DT |
1490 | if (err) \ |
1491 | return err; \ | |
1492 | } while (0) | |
1493 | ||
ac648a6a DT |
1494 | #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \ |
1495 | do { \ | |
7eff2e7a | 1496 | int err = input_add_uevent_modalias_var(env, dev); \ |
ac648a6a DT |
1497 | if (err) \ |
1498 | return err; \ | |
1499 | } while (0) | |
1500 | ||
7eff2e7a | 1501 | static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env) |
a7fadbe1 | 1502 | { |
9657d75c | 1503 | struct input_dev *dev = to_input_dev(device); |
a7fadbe1 DT |
1504 | |
1505 | INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x", | |
1506 | dev->id.bustype, dev->id.vendor, | |
1507 | dev->id.product, dev->id.version); | |
1508 | if (dev->name) | |
1509 | INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); | |
1510 | if (dev->phys) | |
1511 | INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); | |
08de1f04 | 1512 | if (dev->uniq) |
a7fadbe1 DT |
1513 | INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); |
1514 | ||
85b77200 HR |
1515 | INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX); |
1516 | ||
a7fadbe1 DT |
1517 | INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX); |
1518 | if (test_bit(EV_KEY, dev->evbit)) | |
1519 | INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX); | |
1520 | if (test_bit(EV_REL, dev->evbit)) | |
1521 | INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX); | |
1522 | if (test_bit(EV_ABS, dev->evbit)) | |
1523 | INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX); | |
1524 | if (test_bit(EV_MSC, dev->evbit)) | |
1525 | INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX); | |
1526 | if (test_bit(EV_LED, dev->evbit)) | |
1527 | INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX); | |
1528 | if (test_bit(EV_SND, dev->evbit)) | |
1529 | INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX); | |
1530 | if (test_bit(EV_FF, dev->evbit)) | |
1531 | INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX); | |
1532 | if (test_bit(EV_SW, dev->evbit)) | |
1533 | INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); | |
1534 | ||
ac648a6a | 1535 | INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); |
a7fadbe1 DT |
1536 | |
1537 | return 0; | |
1538 | } | |
1539 | ||
3cc96351 DT |
1540 | #define INPUT_DO_TOGGLE(dev, type, bits, on) \ |
1541 | do { \ | |
1542 | int i; \ | |
1543 | bool active; \ | |
1544 | \ | |
1545 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1546 | break; \ | |
1547 | \ | |
1548 | for (i = 0; i < type##_MAX; i++) { \ | |
1549 | if (!test_bit(i, dev->bits##bit)) \ | |
1550 | continue; \ | |
1551 | \ | |
1552 | active = test_bit(i, dev->bits); \ | |
1553 | if (!active && !on) \ | |
1554 | continue; \ | |
1555 | \ | |
1556 | dev->event(dev, EV_##type, i, on ? active : 0); \ | |
1557 | } \ | |
ffd0db97 DT |
1558 | } while (0) |
1559 | ||
b50b5216 | 1560 | static void input_dev_toggle(struct input_dev *dev, bool activate) |
ffd0db97 DT |
1561 | { |
1562 | if (!dev->event) | |
1563 | return; | |
1564 | ||
1565 | INPUT_DO_TOGGLE(dev, LED, led, activate); | |
1566 | INPUT_DO_TOGGLE(dev, SND, snd, activate); | |
1567 | ||
1568 | if (activate && test_bit(EV_REP, dev->evbit)) { | |
1569 | dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]); | |
1570 | dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]); | |
1571 | } | |
1572 | } | |
1573 | ||
b50b5216 DT |
1574 | /** |
1575 | * input_reset_device() - reset/restore the state of input device | |
1576 | * @dev: input device whose state needs to be reset | |
1577 | * | |
1578 | * This function tries to reset the state of an opened input device and | |
1579 | * bring internal state and state if the hardware in sync with each other. | |
1580 | * We mark all keys as released, restore LED state, repeat rate, etc. | |
1581 | */ | |
1582 | void input_reset_device(struct input_dev *dev) | |
1583 | { | |
1584 | mutex_lock(&dev->mutex); | |
1585 | ||
1586 | if (dev->users) { | |
1587 | input_dev_toggle(dev, true); | |
1588 | ||
1589 | /* | |
1590 | * Keys that have been pressed at suspend time are unlikely | |
1591 | * to be still pressed when we resume. | |
1592 | */ | |
1593 | spin_lock_irq(&dev->event_lock); | |
1594 | input_dev_release_keys(dev); | |
1595 | spin_unlock_irq(&dev->event_lock); | |
1596 | } | |
1597 | ||
1598 | mutex_unlock(&dev->mutex); | |
1599 | } | |
1600 | EXPORT_SYMBOL(input_reset_device); | |
1601 | ||
1602 | #ifdef CONFIG_PM | |
ffd0db97 DT |
1603 | static int input_dev_suspend(struct device *dev) |
1604 | { | |
1605 | struct input_dev *input_dev = to_input_dev(dev); | |
1606 | ||
1607 | mutex_lock(&input_dev->mutex); | |
b50b5216 DT |
1608 | |
1609 | if (input_dev->users) | |
1610 | input_dev_toggle(input_dev, false); | |
1611 | ||
ffd0db97 DT |
1612 | mutex_unlock(&input_dev->mutex); |
1613 | ||
1614 | return 0; | |
1615 | } | |
1616 | ||
1617 | static int input_dev_resume(struct device *dev) | |
1618 | { | |
1619 | struct input_dev *input_dev = to_input_dev(dev); | |
1620 | ||
b50b5216 | 1621 | input_reset_device(input_dev); |
ffd0db97 DT |
1622 | |
1623 | return 0; | |
1624 | } | |
1625 | ||
1626 | static const struct dev_pm_ops input_dev_pm_ops = { | |
1627 | .suspend = input_dev_suspend, | |
1628 | .resume = input_dev_resume, | |
1629 | .poweroff = input_dev_suspend, | |
1630 | .restore = input_dev_resume, | |
1631 | }; | |
1632 | #endif /* CONFIG_PM */ | |
1633 | ||
9657d75c DT |
1634 | static struct device_type input_dev_type = { |
1635 | .groups = input_dev_attr_groups, | |
1636 | .release = input_dev_release, | |
1637 | .uevent = input_dev_uevent, | |
ffd0db97 DT |
1638 | #ifdef CONFIG_PM |
1639 | .pm = &input_dev_pm_ops, | |
1640 | #endif | |
9657d75c DT |
1641 | }; |
1642 | ||
e454cea2 | 1643 | static char *input_devnode(struct device *dev, mode_t *mode) |
aa5ed63e KS |
1644 | { |
1645 | return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev)); | |
1646 | } | |
1647 | ||
ea9f240b | 1648 | struct class input_class = { |
9657d75c | 1649 | .name = "input", |
e454cea2 | 1650 | .devnode = input_devnode, |
d19fbe8a | 1651 | }; |
ca56fe07 | 1652 | EXPORT_SYMBOL_GPL(input_class); |
d19fbe8a | 1653 | |
1447190e DT |
1654 | /** |
1655 | * input_allocate_device - allocate memory for new input device | |
1656 | * | |
1657 | * Returns prepared struct input_dev or NULL. | |
1658 | * | |
1659 | * NOTE: Use input_free_device() to free devices that have not been | |
1660 | * registered; input_unregister_device() should be used for already | |
1661 | * registered devices. | |
1662 | */ | |
d19fbe8a DT |
1663 | struct input_dev *input_allocate_device(void) |
1664 | { | |
1665 | struct input_dev *dev; | |
1666 | ||
1667 | dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); | |
1668 | if (dev) { | |
9657d75c DT |
1669 | dev->dev.type = &input_dev_type; |
1670 | dev->dev.class = &input_class; | |
1671 | device_initialize(&dev->dev); | |
f60d2b11 | 1672 | mutex_init(&dev->mutex); |
8006479c | 1673 | spin_lock_init(&dev->event_lock); |
d19fbe8a DT |
1674 | INIT_LIST_HEAD(&dev->h_list); |
1675 | INIT_LIST_HEAD(&dev->node); | |
655816e4 DT |
1676 | |
1677 | __module_get(THIS_MODULE); | |
d19fbe8a DT |
1678 | } |
1679 | ||
1680 | return dev; | |
1681 | } | |
ca56fe07 | 1682 | EXPORT_SYMBOL(input_allocate_device); |
d19fbe8a | 1683 | |
1447190e DT |
1684 | /** |
1685 | * input_free_device - free memory occupied by input_dev structure | |
1686 | * @dev: input device to free | |
1687 | * | |
1688 | * This function should only be used if input_register_device() | |
1689 | * was not called yet or if it failed. Once device was registered | |
1690 | * use input_unregister_device() and memory will be freed once last | |
8006479c | 1691 | * reference to the device is dropped. |
1447190e DT |
1692 | * |
1693 | * Device should be allocated by input_allocate_device(). | |
1694 | * | |
1695 | * NOTE: If there are references to the input device then memory | |
1696 | * will not be freed until last reference is dropped. | |
1697 | */ | |
f60d2b11 DT |
1698 | void input_free_device(struct input_dev *dev) |
1699 | { | |
54f9e36c | 1700 | if (dev) |
f60d2b11 | 1701 | input_put_device(dev); |
f60d2b11 | 1702 | } |
ca56fe07 | 1703 | EXPORT_SYMBOL(input_free_device); |
f60d2b11 | 1704 | |
534565f2 DT |
1705 | /** |
1706 | * input_set_capability - mark device as capable of a certain event | |
1707 | * @dev: device that is capable of emitting or accepting event | |
1708 | * @type: type of the event (EV_KEY, EV_REL, etc...) | |
1709 | * @code: event code | |
1710 | * | |
1711 | * In addition to setting up corresponding bit in appropriate capability | |
1712 | * bitmap the function also adjusts dev->evbit. | |
1713 | */ | |
1714 | void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code) | |
1715 | { | |
1716 | switch (type) { | |
1717 | case EV_KEY: | |
1718 | __set_bit(code, dev->keybit); | |
1719 | break; | |
1720 | ||
1721 | case EV_REL: | |
1722 | __set_bit(code, dev->relbit); | |
1723 | break; | |
1724 | ||
1725 | case EV_ABS: | |
1726 | __set_bit(code, dev->absbit); | |
1727 | break; | |
1728 | ||
1729 | case EV_MSC: | |
1730 | __set_bit(code, dev->mscbit); | |
1731 | break; | |
1732 | ||
1733 | case EV_SW: | |
1734 | __set_bit(code, dev->swbit); | |
1735 | break; | |
1736 | ||
1737 | case EV_LED: | |
1738 | __set_bit(code, dev->ledbit); | |
1739 | break; | |
1740 | ||
1741 | case EV_SND: | |
1742 | __set_bit(code, dev->sndbit); | |
1743 | break; | |
1744 | ||
1745 | case EV_FF: | |
1746 | __set_bit(code, dev->ffbit); | |
1747 | break; | |
1748 | ||
22d1c398 DB |
1749 | case EV_PWR: |
1750 | /* do nothing */ | |
1751 | break; | |
1752 | ||
534565f2 | 1753 | default: |
da0c4901 JP |
1754 | pr_err("input_set_capability: unknown type %u (code %u)\n", |
1755 | type, code); | |
534565f2 DT |
1756 | dump_stack(); |
1757 | return; | |
1758 | } | |
1759 | ||
1760 | __set_bit(type, dev->evbit); | |
1761 | } | |
1762 | EXPORT_SYMBOL(input_set_capability); | |
1763 | ||
92a3a587 DT |
1764 | #define INPUT_CLEANSE_BITMASK(dev, type, bits) \ |
1765 | do { \ | |
1766 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1767 | memset(dev->bits##bit, 0, \ | |
1768 | sizeof(dev->bits##bit)); \ | |
1769 | } while (0) | |
1770 | ||
1771 | static void input_cleanse_bitmasks(struct input_dev *dev) | |
1772 | { | |
1773 | INPUT_CLEANSE_BITMASK(dev, KEY, key); | |
1774 | INPUT_CLEANSE_BITMASK(dev, REL, rel); | |
1775 | INPUT_CLEANSE_BITMASK(dev, ABS, abs); | |
1776 | INPUT_CLEANSE_BITMASK(dev, MSC, msc); | |
1777 | INPUT_CLEANSE_BITMASK(dev, LED, led); | |
1778 | INPUT_CLEANSE_BITMASK(dev, SND, snd); | |
1779 | INPUT_CLEANSE_BITMASK(dev, FF, ff); | |
1780 | INPUT_CLEANSE_BITMASK(dev, SW, sw); | |
1781 | } | |
1782 | ||
8006479c DT |
1783 | /** |
1784 | * input_register_device - register device with input core | |
1785 | * @dev: device to be registered | |
1786 | * | |
1787 | * This function registers device with input core. The device must be | |
1788 | * allocated with input_allocate_device() and all it's capabilities | |
1789 | * set up before registering. | |
1790 | * If function fails the device must be freed with input_free_device(). | |
1791 | * Once device has been successfully registered it can be unregistered | |
1792 | * with input_unregister_device(); input_free_device() should not be | |
1793 | * called in this case. | |
1794 | */ | |
5f945489 | 1795 | int input_register_device(struct input_dev *dev) |
1da177e4 | 1796 | { |
bd0ef235 | 1797 | static atomic_t input_no = ATOMIC_INIT(0); |
1da177e4 | 1798 | struct input_handler *handler; |
bd0ef235 DT |
1799 | const char *path; |
1800 | int error; | |
1da177e4 | 1801 | |
4f93df40 | 1802 | /* Every input device generates EV_SYN/SYN_REPORT events. */ |
8006479c | 1803 | __set_bit(EV_SYN, dev->evbit); |
0fbf87ca | 1804 | |
4f93df40 DT |
1805 | /* KEY_RESERVED is not supposed to be transmitted to userspace. */ |
1806 | __clear_bit(KEY_RESERVED, dev->keybit); | |
1807 | ||
92a3a587 DT |
1808 | /* Make sure that bitmasks not mentioned in dev->evbit are clean. */ |
1809 | input_cleanse_bitmasks(dev); | |
1810 | ||
1da177e4 LT |
1811 | /* |
1812 | * If delay and period are pre-set by the driver, then autorepeating | |
1813 | * is handled by the driver itself and we don't do it in input.c. | |
1814 | */ | |
1da177e4 LT |
1815 | init_timer(&dev->timer); |
1816 | if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { | |
1817 | dev->timer.data = (long) dev; | |
1818 | dev->timer.function = input_repeat_key; | |
1819 | dev->rep[REP_DELAY] = 250; | |
1820 | dev->rep[REP_PERIOD] = 33; | |
1821 | } | |
1822 | ||
aebd636b DT |
1823 | if (!dev->getkeycode) |
1824 | dev->getkeycode = input_default_getkeycode; | |
c8e4c772 | 1825 | |
aebd636b DT |
1826 | if (!dev->setkeycode) |
1827 | dev->setkeycode = input_default_setkeycode; | |
c8e4c772 | 1828 | |
a6c2490f KS |
1829 | dev_set_name(&dev->dev, "input%ld", |
1830 | (unsigned long) atomic_inc_return(&input_no) - 1); | |
bd0ef235 | 1831 | |
9657d75c | 1832 | error = device_add(&dev->dev); |
bd0ef235 DT |
1833 | if (error) |
1834 | return error; | |
1835 | ||
9657d75c | 1836 | path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
da0c4901 JP |
1837 | pr_info("%s as %s\n", |
1838 | dev->name ? dev->name : "Unspecified device", | |
1839 | path ? path : "N/A"); | |
bd0ef235 | 1840 | kfree(path); |
10204020 | 1841 | |
8006479c DT |
1842 | error = mutex_lock_interruptible(&input_mutex); |
1843 | if (error) { | |
1844 | device_del(&dev->dev); | |
1845 | return error; | |
1846 | } | |
1847 | ||
1848 | list_add_tail(&dev->node, &input_dev_list); | |
1849 | ||
1da177e4 | 1850 | list_for_each_entry(handler, &input_handler_list, node) |
5b2a0826 | 1851 | input_attach_handler(dev, handler); |
1da177e4 | 1852 | |
f96b434d | 1853 | input_wakeup_procfs_readers(); |
5f945489 | 1854 | |
8006479c DT |
1855 | mutex_unlock(&input_mutex); |
1856 | ||
5f945489 | 1857 | return 0; |
1da177e4 | 1858 | } |
ca56fe07 | 1859 | EXPORT_SYMBOL(input_register_device); |
1da177e4 | 1860 | |
8006479c DT |
1861 | /** |
1862 | * input_unregister_device - unregister previously registered device | |
1863 | * @dev: device to be unregistered | |
1864 | * | |
1865 | * This function unregisters an input device. Once device is unregistered | |
1866 | * the caller should not try to access it as it may get freed at any moment. | |
1867 | */ | |
1da177e4 LT |
1868 | void input_unregister_device(struct input_dev *dev) |
1869 | { | |
5b2a0826 | 1870 | struct input_handle *handle, *next; |
1da177e4 | 1871 | |
8006479c | 1872 | input_disconnect_device(dev); |
1da177e4 | 1873 | |
8006479c | 1874 | mutex_lock(&input_mutex); |
1da177e4 | 1875 | |
5b2a0826 | 1876 | list_for_each_entry_safe(handle, next, &dev->h_list, d_node) |
1da177e4 | 1877 | handle->handler->disconnect(handle); |
5b2a0826 | 1878 | WARN_ON(!list_empty(&dev->h_list)); |
1da177e4 | 1879 | |
8006479c | 1880 | del_timer_sync(&dev->timer); |
1da177e4 LT |
1881 | list_del_init(&dev->node); |
1882 | ||
f96b434d | 1883 | input_wakeup_procfs_readers(); |
8006479c DT |
1884 | |
1885 | mutex_unlock(&input_mutex); | |
1886 | ||
1887 | device_unregister(&dev->dev); | |
1da177e4 | 1888 | } |
ca56fe07 | 1889 | EXPORT_SYMBOL(input_unregister_device); |
1da177e4 | 1890 | |
8006479c DT |
1891 | /** |
1892 | * input_register_handler - register a new input handler | |
1893 | * @handler: handler to be registered | |
1894 | * | |
1895 | * This function registers a new input handler (interface) for input | |
1896 | * devices in the system and attaches it to all input devices that | |
1897 | * are compatible with the handler. | |
1898 | */ | |
4263cf0f | 1899 | int input_register_handler(struct input_handler *handler) |
1da177e4 LT |
1900 | { |
1901 | struct input_dev *dev; | |
8006479c DT |
1902 | int retval; |
1903 | ||
1904 | retval = mutex_lock_interruptible(&input_mutex); | |
1905 | if (retval) | |
1906 | return retval; | |
1da177e4 | 1907 | |
1da177e4 LT |
1908 | INIT_LIST_HEAD(&handler->h_list); |
1909 | ||
4263cf0f | 1910 | if (handler->fops != NULL) { |
8006479c DT |
1911 | if (input_table[handler->minor >> 5]) { |
1912 | retval = -EBUSY; | |
1913 | goto out; | |
1914 | } | |
1da177e4 | 1915 | input_table[handler->minor >> 5] = handler; |
4263cf0f | 1916 | } |
1da177e4 LT |
1917 | |
1918 | list_add_tail(&handler->node, &input_handler_list); | |
1919 | ||
1920 | list_for_each_entry(dev, &input_dev_list, node) | |
5b2a0826 | 1921 | input_attach_handler(dev, handler); |
1da177e4 | 1922 | |
f96b434d | 1923 | input_wakeup_procfs_readers(); |
8006479c DT |
1924 | |
1925 | out: | |
1926 | mutex_unlock(&input_mutex); | |
1927 | return retval; | |
1da177e4 | 1928 | } |
ca56fe07 | 1929 | EXPORT_SYMBOL(input_register_handler); |
1da177e4 | 1930 | |
8006479c DT |
1931 | /** |
1932 | * input_unregister_handler - unregisters an input handler | |
1933 | * @handler: handler to be unregistered | |
1934 | * | |
1935 | * This function disconnects a handler from its input devices and | |
1936 | * removes it from lists of known handlers. | |
1937 | */ | |
1da177e4 LT |
1938 | void input_unregister_handler(struct input_handler *handler) |
1939 | { | |
5b2a0826 | 1940 | struct input_handle *handle, *next; |
1da177e4 | 1941 | |
8006479c DT |
1942 | mutex_lock(&input_mutex); |
1943 | ||
5b2a0826 | 1944 | list_for_each_entry_safe(handle, next, &handler->h_list, h_node) |
1da177e4 | 1945 | handler->disconnect(handle); |
5b2a0826 | 1946 | WARN_ON(!list_empty(&handler->h_list)); |
1da177e4 LT |
1947 | |
1948 | list_del_init(&handler->node); | |
1949 | ||
1950 | if (handler->fops != NULL) | |
1951 | input_table[handler->minor >> 5] = NULL; | |
1952 | ||
f96b434d | 1953 | input_wakeup_procfs_readers(); |
8006479c DT |
1954 | |
1955 | mutex_unlock(&input_mutex); | |
1da177e4 | 1956 | } |
ca56fe07 | 1957 | EXPORT_SYMBOL(input_unregister_handler); |
1da177e4 | 1958 | |
66d2a595 DT |
1959 | /** |
1960 | * input_handler_for_each_handle - handle iterator | |
1961 | * @handler: input handler to iterate | |
1962 | * @data: data for the callback | |
1963 | * @fn: function to be called for each handle | |
1964 | * | |
1965 | * Iterate over @bus's list of devices, and call @fn for each, passing | |
1966 | * it @data and stop when @fn returns a non-zero value. The function is | |
1967 | * using RCU to traverse the list and therefore may be usind in atonic | |
1968 | * contexts. The @fn callback is invoked from RCU critical section and | |
1969 | * thus must not sleep. | |
1970 | */ | |
1971 | int input_handler_for_each_handle(struct input_handler *handler, void *data, | |
1972 | int (*fn)(struct input_handle *, void *)) | |
1973 | { | |
1974 | struct input_handle *handle; | |
1975 | int retval = 0; | |
1976 | ||
1977 | rcu_read_lock(); | |
1978 | ||
1979 | list_for_each_entry_rcu(handle, &handler->h_list, h_node) { | |
1980 | retval = fn(handle, data); | |
1981 | if (retval) | |
1982 | break; | |
1983 | } | |
1984 | ||
1985 | rcu_read_unlock(); | |
1986 | ||
1987 | return retval; | |
1988 | } | |
1989 | EXPORT_SYMBOL(input_handler_for_each_handle); | |
1990 | ||
8006479c DT |
1991 | /** |
1992 | * input_register_handle - register a new input handle | |
1993 | * @handle: handle to register | |
1994 | * | |
1995 | * This function puts a new input handle onto device's | |
1996 | * and handler's lists so that events can flow through | |
1997 | * it once it is opened using input_open_device(). | |
1998 | * | |
1999 | * This function is supposed to be called from handler's | |
2000 | * connect() method. | |
2001 | */ | |
5b2a0826 DT |
2002 | int input_register_handle(struct input_handle *handle) |
2003 | { | |
2004 | struct input_handler *handler = handle->handler; | |
8006479c DT |
2005 | struct input_dev *dev = handle->dev; |
2006 | int error; | |
2007 | ||
2008 | /* | |
2009 | * We take dev->mutex here to prevent race with | |
2010 | * input_release_device(). | |
2011 | */ | |
2012 | error = mutex_lock_interruptible(&dev->mutex); | |
2013 | if (error) | |
2014 | return error; | |
ef7995f4 DT |
2015 | |
2016 | /* | |
2017 | * Filters go to the head of the list, normal handlers | |
2018 | * to the tail. | |
2019 | */ | |
2020 | if (handler->filter) | |
2021 | list_add_rcu(&handle->d_node, &dev->h_list); | |
2022 | else | |
2023 | list_add_tail_rcu(&handle->d_node, &dev->h_list); | |
2024 | ||
8006479c | 2025 | mutex_unlock(&dev->mutex); |
5b2a0826 | 2026 | |
8006479c DT |
2027 | /* |
2028 | * Since we are supposed to be called from ->connect() | |
2029 | * which is mutually exclusive with ->disconnect() | |
2030 | * we can't be racing with input_unregister_handle() | |
2031 | * and so separate lock is not needed here. | |
2032 | */ | |
66d2a595 | 2033 | list_add_tail_rcu(&handle->h_node, &handler->h_list); |
5b2a0826 DT |
2034 | |
2035 | if (handler->start) | |
2036 | handler->start(handle); | |
2037 | ||
2038 | return 0; | |
2039 | } | |
2040 | EXPORT_SYMBOL(input_register_handle); | |
2041 | ||
8006479c DT |
2042 | /** |
2043 | * input_unregister_handle - unregister an input handle | |
2044 | * @handle: handle to unregister | |
2045 | * | |
2046 | * This function removes input handle from device's | |
2047 | * and handler's lists. | |
2048 | * | |
2049 | * This function is supposed to be called from handler's | |
2050 | * disconnect() method. | |
2051 | */ | |
5b2a0826 DT |
2052 | void input_unregister_handle(struct input_handle *handle) |
2053 | { | |
8006479c DT |
2054 | struct input_dev *dev = handle->dev; |
2055 | ||
66d2a595 | 2056 | list_del_rcu(&handle->h_node); |
8006479c DT |
2057 | |
2058 | /* | |
2059 | * Take dev->mutex to prevent race with input_release_device(). | |
2060 | */ | |
2061 | mutex_lock(&dev->mutex); | |
2062 | list_del_rcu(&handle->d_node); | |
2063 | mutex_unlock(&dev->mutex); | |
66d2a595 | 2064 | |
82ba56c2 | 2065 | synchronize_rcu(); |
5b2a0826 DT |
2066 | } |
2067 | EXPORT_SYMBOL(input_unregister_handle); | |
2068 | ||
1da177e4 LT |
2069 | static int input_open_file(struct inode *inode, struct file *file) |
2070 | { | |
2edbf853 | 2071 | struct input_handler *handler; |
99ac48f5 | 2072 | const struct file_operations *old_fops, *new_fops = NULL; |
1da177e4 LT |
2073 | int err; |
2074 | ||
2f2177c8 AB |
2075 | err = mutex_lock_interruptible(&input_mutex); |
2076 | if (err) | |
2077 | return err; | |
2078 | ||
1da177e4 | 2079 | /* No load-on-demand here? */ |
2edbf853 | 2080 | handler = input_table[iminor(inode) >> 5]; |
2f2177c8 AB |
2081 | if (handler) |
2082 | new_fops = fops_get(handler->fops); | |
2083 | ||
2084 | mutex_unlock(&input_mutex); | |
1da177e4 LT |
2085 | |
2086 | /* | |
2087 | * That's _really_ odd. Usually NULL ->open means "nothing special", | |
2088 | * not "no device". Oh, well... | |
2089 | */ | |
2f2177c8 | 2090 | if (!new_fops || !new_fops->open) { |
1da177e4 | 2091 | fops_put(new_fops); |
2edbf853 JC |
2092 | err = -ENODEV; |
2093 | goto out; | |
1da177e4 | 2094 | } |
2f2177c8 | 2095 | |
1da177e4 LT |
2096 | old_fops = file->f_op; |
2097 | file->f_op = new_fops; | |
2098 | ||
2099 | err = new_fops->open(inode, file); | |
1da177e4 LT |
2100 | if (err) { |
2101 | fops_put(file->f_op); | |
2102 | file->f_op = fops_get(old_fops); | |
2103 | } | |
2104 | fops_put(old_fops); | |
2edbf853 | 2105 | out: |
1da177e4 LT |
2106 | return err; |
2107 | } | |
2108 | ||
2b8693c0 | 2109 | static const struct file_operations input_fops = { |
1da177e4 LT |
2110 | .owner = THIS_MODULE, |
2111 | .open = input_open_file, | |
6038f373 | 2112 | .llseek = noop_llseek, |
1da177e4 LT |
2113 | }; |
2114 | ||
f96b434d | 2115 | static int __init input_init(void) |
1da177e4 | 2116 | { |
f96b434d | 2117 | int err; |
1da177e4 | 2118 | |
ea9f240b | 2119 | err = class_register(&input_class); |
d19fbe8a | 2120 | if (err) { |
da0c4901 | 2121 | pr_err("unable to register input_dev class\n"); |
d19fbe8a DT |
2122 | return err; |
2123 | } | |
2124 | ||
f96b434d DT |
2125 | err = input_proc_init(); |
2126 | if (err) | |
b0fdfebb | 2127 | goto fail1; |
1da177e4 | 2128 | |
f96b434d DT |
2129 | err = register_chrdev(INPUT_MAJOR, "input", &input_fops); |
2130 | if (err) { | |
da0c4901 | 2131 | pr_err("unable to register char major %d", INPUT_MAJOR); |
b0fdfebb | 2132 | goto fail2; |
1da177e4 | 2133 | } |
e334016f | 2134 | |
1da177e4 | 2135 | return 0; |
1da177e4 | 2136 | |
b0fdfebb | 2137 | fail2: input_proc_exit(); |
ea9f240b | 2138 | fail1: class_unregister(&input_class); |
f96b434d | 2139 | return err; |
1da177e4 LT |
2140 | } |
2141 | ||
2142 | static void __exit input_exit(void) | |
2143 | { | |
f96b434d | 2144 | input_proc_exit(); |
1da177e4 | 2145 | unregister_chrdev(INPUT_MAJOR, "input"); |
ea9f240b | 2146 | class_unregister(&input_class); |
1da177e4 LT |
2147 | } |
2148 | ||
2149 | subsys_initcall(input_init); | |
2150 | module_exit(input_exit); |