Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * The input core | |
3 | * | |
4 | * Copyright (c) 1999-2002 Vojtech Pavlik | |
5 | */ | |
6 | ||
7 | /* | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License version 2 as published by | |
10 | * the Free Software Foundation. | |
11 | */ | |
12 | ||
da0c4901 JP |
13 | #define pr_fmt(fmt) KBUILD_BASENAME ": " fmt |
14 | ||
1da177e4 | 15 | #include <linux/init.h> |
ffd0db97 | 16 | #include <linux/types.h> |
47c78e89 | 17 | #include <linux/input/mt.h> |
1da177e4 | 18 | #include <linux/module.h> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
1da177e4 LT |
20 | #include <linux/random.h> |
21 | #include <linux/major.h> | |
22 | #include <linux/proc_fs.h> | |
a99bbaf5 | 23 | #include <linux/sched.h> |
969b21cd | 24 | #include <linux/seq_file.h> |
1da177e4 LT |
25 | #include <linux/poll.h> |
26 | #include <linux/device.h> | |
e676c232 | 27 | #include <linux/mutex.h> |
8006479c | 28 | #include <linux/rcupdate.h> |
15e184af | 29 | #include "input-compat.h" |
1da177e4 LT |
30 | |
31 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>"); | |
32 | MODULE_DESCRIPTION("Input core"); | |
33 | MODULE_LICENSE("GPL"); | |
34 | ||
1da177e4 LT |
35 | #define INPUT_DEVICES 256 |
36 | ||
37 | static LIST_HEAD(input_dev_list); | |
38 | static LIST_HEAD(input_handler_list); | |
39 | ||
8006479c DT |
40 | /* |
41 | * input_mutex protects access to both input_dev_list and input_handler_list. | |
42 | * This also causes input_[un]register_device and input_[un]register_handler | |
43 | * be mutually exclusive which simplifies locking in drivers implementing | |
44 | * input handlers. | |
45 | */ | |
46 | static DEFINE_MUTEX(input_mutex); | |
47 | ||
1da177e4 LT |
48 | static struct input_handler *input_table[8]; |
49 | ||
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, | |
78 | unsigned int type, unsigned int code, int value) | |
79 | { | |
ef7995f4 | 80 | struct input_handler *handler; |
82ba56c2 DT |
81 | struct input_handle *handle; |
82 | ||
83 | rcu_read_lock(); | |
1da177e4 | 84 | |
82ba56c2 | 85 | handle = rcu_dereference(dev->grab); |
8006479c DT |
86 | if (handle) |
87 | handle->handler->event(handle, type, code, value); | |
ef7995f4 DT |
88 | else { |
89 | bool filtered = false; | |
90 | ||
91 | list_for_each_entry_rcu(handle, &dev->h_list, d_node) { | |
92 | if (!handle->open) | |
93 | continue; | |
94 | ||
95 | handler = handle->handler; | |
96 | if (!handler->filter) { | |
97 | if (filtered) | |
98 | break; | |
99 | ||
100 | handler->event(handle, type, code, value); | |
101 | ||
102 | } else if (handler->filter(handle, type, code, value)) | |
103 | filtered = true; | |
104 | } | |
105 | } | |
106 | ||
82ba56c2 | 107 | rcu_read_unlock(); |
8006479c | 108 | } |
1da177e4 | 109 | |
8006479c DT |
110 | /* |
111 | * Generate software autorepeat event. Note that we take | |
112 | * dev->event_lock here to avoid racing with input_event | |
113 | * which may cause keys get "stuck". | |
114 | */ | |
115 | static void input_repeat_key(unsigned long data) | |
116 | { | |
117 | struct input_dev *dev = (void *) data; | |
118 | unsigned long flags; | |
1da177e4 | 119 | |
8006479c | 120 | spin_lock_irqsave(&dev->event_lock, flags); |
1da177e4 | 121 | |
8006479c DT |
122 | if (test_bit(dev->repeat_key, dev->key) && |
123 | is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) { | |
1da177e4 | 124 | |
9ae4345a | 125 | input_pass_event(dev, EV_KEY, dev->repeat_key, 2); |
1da177e4 | 126 | |
8006479c DT |
127 | if (dev->sync) { |
128 | /* | |
129 | * Only send SYN_REPORT if we are not in a middle | |
130 | * of driver parsing a new hardware packet. | |
131 | * Otherwise assume that the driver will send | |
132 | * SYN_REPORT once it's done. | |
133 | */ | |
9ae4345a | 134 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); |
8006479c | 135 | } |
31581066 | 136 | |
8006479c DT |
137 | if (dev->rep[REP_PERIOD]) |
138 | mod_timer(&dev->timer, jiffies + | |
139 | msecs_to_jiffies(dev->rep[REP_PERIOD])); | |
140 | } | |
31581066 | 141 | |
8006479c DT |
142 | spin_unlock_irqrestore(&dev->event_lock, flags); |
143 | } | |
31581066 | 144 | |
8006479c DT |
145 | static void input_start_autorepeat(struct input_dev *dev, int code) |
146 | { | |
147 | if (test_bit(EV_REP, dev->evbit) && | |
148 | dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && | |
149 | dev->timer.data) { | |
150 | dev->repeat_key = code; | |
151 | mod_timer(&dev->timer, | |
152 | jiffies + msecs_to_jiffies(dev->rep[REP_DELAY])); | |
153 | } | |
154 | } | |
31581066 | 155 | |
e7b5c1ef JB |
156 | static void input_stop_autorepeat(struct input_dev *dev) |
157 | { | |
158 | del_timer(&dev->timer); | |
159 | } | |
160 | ||
8006479c DT |
161 | #define INPUT_IGNORE_EVENT 0 |
162 | #define INPUT_PASS_TO_HANDLERS 1 | |
163 | #define INPUT_PASS_TO_DEVICE 2 | |
164 | #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE) | |
1da177e4 | 165 | |
40d007e7 HR |
166 | static int input_handle_abs_event(struct input_dev *dev, |
167 | unsigned int code, int *pval) | |
168 | { | |
169 | bool is_mt_event; | |
170 | int *pold; | |
171 | ||
172 | if (code == ABS_MT_SLOT) { | |
173 | /* | |
174 | * "Stage" the event; we'll flush it later, when we | |
144c0f88 | 175 | * get actual touch data. |
40d007e7 HR |
176 | */ |
177 | if (*pval >= 0 && *pval < dev->mtsize) | |
178 | dev->slot = *pval; | |
179 | ||
180 | return INPUT_IGNORE_EVENT; | |
181 | } | |
182 | ||
183 | is_mt_event = code >= ABS_MT_FIRST && code <= ABS_MT_LAST; | |
184 | ||
185 | if (!is_mt_event) { | |
d31b2865 | 186 | pold = &dev->absinfo[code].value; |
40d007e7 HR |
187 | } else if (dev->mt) { |
188 | struct input_mt_slot *mtslot = &dev->mt[dev->slot]; | |
189 | pold = &mtslot->abs[code - ABS_MT_FIRST]; | |
190 | } else { | |
191 | /* | |
144c0f88 | 192 | * Bypass filtering for multi-touch events when |
40d007e7 HR |
193 | * not employing slots. |
194 | */ | |
195 | pold = NULL; | |
196 | } | |
197 | ||
198 | if (pold) { | |
199 | *pval = input_defuzz_abs_event(*pval, *pold, | |
d31b2865 | 200 | dev->absinfo[code].fuzz); |
40d007e7 HR |
201 | if (*pold == *pval) |
202 | return INPUT_IGNORE_EVENT; | |
203 | ||
204 | *pold = *pval; | |
205 | } | |
206 | ||
207 | /* Flush pending "slot" event */ | |
987a6c02 DM |
208 | if (is_mt_event && dev->slot != input_abs_get_val(dev, ABS_MT_SLOT)) { |
209 | input_abs_set_val(dev, ABS_MT_SLOT, dev->slot); | |
9ae4345a | 210 | input_pass_event(dev, EV_ABS, ABS_MT_SLOT, dev->slot); |
40d007e7 HR |
211 | } |
212 | ||
213 | return INPUT_PASS_TO_HANDLERS; | |
214 | } | |
215 | ||
8006479c DT |
216 | static void input_handle_event(struct input_dev *dev, |
217 | unsigned int type, unsigned int code, int value) | |
218 | { | |
219 | int disposition = INPUT_IGNORE_EVENT; | |
1da177e4 | 220 | |
8006479c | 221 | switch (type) { |
1da177e4 | 222 | |
8006479c DT |
223 | case EV_SYN: |
224 | switch (code) { | |
225 | case SYN_CONFIG: | |
226 | disposition = INPUT_PASS_TO_ALL; | |
227 | break; | |
1da177e4 | 228 | |
8006479c DT |
229 | case SYN_REPORT: |
230 | if (!dev->sync) { | |
20da92de | 231 | dev->sync = true; |
8006479c | 232 | disposition = INPUT_PASS_TO_HANDLERS; |
1da177e4 | 233 | } |
1da177e4 | 234 | break; |
5e5ee686 | 235 | case SYN_MT_REPORT: |
20da92de | 236 | dev->sync = false; |
5e5ee686 HR |
237 | disposition = INPUT_PASS_TO_HANDLERS; |
238 | break; | |
8006479c DT |
239 | } |
240 | break; | |
1da177e4 | 241 | |
8006479c DT |
242 | case EV_KEY: |
243 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
244 | !!test_bit(code, dev->key) != value) { | |
1da177e4 | 245 | |
8006479c DT |
246 | if (value != 2) { |
247 | __change_bit(code, dev->key); | |
248 | if (value) | |
249 | input_start_autorepeat(dev, code); | |
e7b5c1ef JB |
250 | else |
251 | input_stop_autorepeat(dev); | |
8006479c | 252 | } |
1da177e4 | 253 | |
8006479c DT |
254 | disposition = INPUT_PASS_TO_HANDLERS; |
255 | } | |
256 | break; | |
1da177e4 | 257 | |
8006479c DT |
258 | case EV_SW: |
259 | if (is_event_supported(code, dev->swbit, SW_MAX) && | |
260 | !!test_bit(code, dev->sw) != value) { | |
1da177e4 | 261 | |
8006479c DT |
262 | __change_bit(code, dev->sw); |
263 | disposition = INPUT_PASS_TO_HANDLERS; | |
264 | } | |
265 | break; | |
1da177e4 | 266 | |
8006479c | 267 | case EV_ABS: |
40d007e7 | 268 | if (is_event_supported(code, dev->absbit, ABS_MAX)) |
9ae4345a | 269 | disposition = input_handle_abs_event(dev, code, &value); |
61994a61 | 270 | |
8006479c | 271 | break; |
1da177e4 | 272 | |
8006479c DT |
273 | case EV_REL: |
274 | if (is_event_supported(code, dev->relbit, REL_MAX) && value) | |
275 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 276 | |
8006479c | 277 | break; |
1e0afb28 | 278 | |
8006479c DT |
279 | case EV_MSC: |
280 | if (is_event_supported(code, dev->mscbit, MSC_MAX)) | |
281 | disposition = INPUT_PASS_TO_ALL; | |
1da177e4 | 282 | |
8006479c | 283 | break; |
1da177e4 | 284 | |
8006479c DT |
285 | case EV_LED: |
286 | if (is_event_supported(code, dev->ledbit, LED_MAX) && | |
287 | !!test_bit(code, dev->led) != value) { | |
1da177e4 | 288 | |
8006479c DT |
289 | __change_bit(code, dev->led); |
290 | disposition = INPUT_PASS_TO_ALL; | |
291 | } | |
292 | break; | |
293 | ||
294 | case EV_SND: | |
295 | if (is_event_supported(code, dev->sndbit, SND_MAX)) { | |
1da177e4 | 296 | |
8fdc1948 | 297 | if (!!test_bit(code, dev->snd) != !!value) |
8006479c DT |
298 | __change_bit(code, dev->snd); |
299 | disposition = INPUT_PASS_TO_ALL; | |
300 | } | |
301 | break; | |
8fdc1948 | 302 | |
8006479c DT |
303 | case EV_REP: |
304 | if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) { | |
305 | dev->rep[code] = value; | |
306 | disposition = INPUT_PASS_TO_ALL; | |
307 | } | |
308 | break; | |
1da177e4 | 309 | |
8006479c DT |
310 | case EV_FF: |
311 | if (value >= 0) | |
312 | disposition = INPUT_PASS_TO_ALL; | |
313 | break; | |
ed2fa4dd RP |
314 | |
315 | case EV_PWR: | |
316 | disposition = INPUT_PASS_TO_ALL; | |
317 | break; | |
8006479c | 318 | } |
1da177e4 | 319 | |
c9812282 | 320 | if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN) |
20da92de | 321 | dev->sync = false; |
1da177e4 | 322 | |
8006479c DT |
323 | if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event) |
324 | dev->event(dev, type, code, value); | |
1da177e4 | 325 | |
8006479c | 326 | if (disposition & INPUT_PASS_TO_HANDLERS) |
9ae4345a | 327 | input_pass_event(dev, type, code, value); |
8006479c | 328 | } |
1da177e4 | 329 | |
8006479c DT |
330 | /** |
331 | * input_event() - report new input event | |
332 | * @dev: device that generated the event | |
333 | * @type: type of the event | |
334 | * @code: event code | |
335 | * @value: value of the event | |
336 | * | |
337 | * This function should be used by drivers implementing various input | |
df2d4637 DT |
338 | * devices to report input events. See also input_inject_event(). |
339 | * | |
340 | * NOTE: input_event() may be safely used right after input device was | |
341 | * allocated with input_allocate_device(), even before it is registered | |
342 | * with input_register_device(), but the event will not reach any of the | |
343 | * input handlers. Such early invocation of input_event() may be used | |
344 | * to 'seed' initial state of a switch or initial position of absolute | |
345 | * axis, etc. | |
8006479c | 346 | */ |
8006479c DT |
347 | void input_event(struct input_dev *dev, |
348 | unsigned int type, unsigned int code, int value) | |
349 | { | |
350 | unsigned long flags; | |
509ca1a9 | 351 | |
8006479c | 352 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
509ca1a9 | 353 | |
8006479c DT |
354 | spin_lock_irqsave(&dev->event_lock, flags); |
355 | add_input_randomness(type, code, value); | |
9ae4345a | 356 | input_handle_event(dev, type, code, value); |
8006479c | 357 | spin_unlock_irqrestore(&dev->event_lock, flags); |
1da177e4 | 358 | } |
1da177e4 | 359 | } |
ca56fe07 | 360 | EXPORT_SYMBOL(input_event); |
1da177e4 | 361 | |
0e739d28 DT |
362 | /** |
363 | * input_inject_event() - send input event from input handler | |
364 | * @handle: input handle to send event through | |
365 | * @type: type of the event | |
366 | * @code: event code | |
367 | * @value: value of the event | |
368 | * | |
8006479c DT |
369 | * Similar to input_event() but will ignore event if device is |
370 | * "grabbed" and handle injecting event is not the one that owns | |
371 | * the device. | |
0e739d28 | 372 | */ |
8006479c DT |
373 | void input_inject_event(struct input_handle *handle, |
374 | unsigned int type, unsigned int code, int value) | |
1da177e4 | 375 | { |
8006479c DT |
376 | struct input_dev *dev = handle->dev; |
377 | struct input_handle *grab; | |
378 | unsigned long flags; | |
1da177e4 | 379 | |
8006479c DT |
380 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
381 | spin_lock_irqsave(&dev->event_lock, flags); | |
1da177e4 | 382 | |
82ba56c2 | 383 | rcu_read_lock(); |
8006479c DT |
384 | grab = rcu_dereference(dev->grab); |
385 | if (!grab || grab == handle) | |
9ae4345a | 386 | input_handle_event(dev, type, code, value); |
82ba56c2 | 387 | rcu_read_unlock(); |
1da177e4 | 388 | |
8006479c DT |
389 | spin_unlock_irqrestore(&dev->event_lock, flags); |
390 | } | |
1da177e4 | 391 | } |
8006479c | 392 | EXPORT_SYMBOL(input_inject_event); |
1da177e4 | 393 | |
d31b2865 DM |
394 | /** |
395 | * input_alloc_absinfo - allocates array of input_absinfo structs | |
396 | * @dev: the input device emitting absolute events | |
397 | * | |
398 | * If the absinfo struct the caller asked for is already allocated, this | |
399 | * functions will not do anything. | |
400 | */ | |
401 | void input_alloc_absinfo(struct input_dev *dev) | |
402 | { | |
403 | if (!dev->absinfo) | |
404 | dev->absinfo = kcalloc(ABS_CNT, sizeof(struct input_absinfo), | |
405 | GFP_KERNEL); | |
406 | ||
407 | WARN(!dev->absinfo, "%s(): kcalloc() failed?\n", __func__); | |
408 | } | |
409 | EXPORT_SYMBOL(input_alloc_absinfo); | |
410 | ||
411 | void input_set_abs_params(struct input_dev *dev, unsigned int axis, | |
412 | int min, int max, int fuzz, int flat) | |
413 | { | |
414 | struct input_absinfo *absinfo; | |
415 | ||
416 | input_alloc_absinfo(dev); | |
417 | if (!dev->absinfo) | |
418 | return; | |
419 | ||
420 | absinfo = &dev->absinfo[axis]; | |
421 | absinfo->minimum = min; | |
422 | absinfo->maximum = max; | |
423 | absinfo->fuzz = fuzz; | |
424 | absinfo->flat = flat; | |
425 | ||
426 | dev->absbit[BIT_WORD(axis)] |= BIT_MASK(axis); | |
427 | } | |
428 | EXPORT_SYMBOL(input_set_abs_params); | |
429 | ||
430 | ||
8006479c DT |
431 | /** |
432 | * input_grab_device - grabs device for exclusive use | |
433 | * @handle: input handle that wants to own the device | |
434 | * | |
435 | * When a device is grabbed by an input handle all events generated by | |
436 | * the device are delivered only to this handle. Also events injected | |
437 | * by other input handles are ignored while device is grabbed. | |
438 | */ | |
1da177e4 LT |
439 | int input_grab_device(struct input_handle *handle) |
440 | { | |
8006479c DT |
441 | struct input_dev *dev = handle->dev; |
442 | int retval; | |
1da177e4 | 443 | |
8006479c DT |
444 | retval = mutex_lock_interruptible(&dev->mutex); |
445 | if (retval) | |
446 | return retval; | |
447 | ||
448 | if (dev->grab) { | |
449 | retval = -EBUSY; | |
450 | goto out; | |
451 | } | |
452 | ||
453 | rcu_assign_pointer(dev->grab, handle); | |
82ba56c2 | 454 | synchronize_rcu(); |
8006479c DT |
455 | |
456 | out: | |
457 | mutex_unlock(&dev->mutex); | |
458 | return retval; | |
1da177e4 | 459 | } |
ca56fe07 | 460 | EXPORT_SYMBOL(input_grab_device); |
1da177e4 | 461 | |
8006479c | 462 | static void __input_release_device(struct input_handle *handle) |
1da177e4 | 463 | { |
a2b2ed2c | 464 | struct input_dev *dev = handle->dev; |
c7e8dc6e | 465 | |
a2b2ed2c | 466 | if (dev->grab == handle) { |
8006479c DT |
467 | rcu_assign_pointer(dev->grab, NULL); |
468 | /* Make sure input_pass_event() notices that grab is gone */ | |
82ba56c2 | 469 | synchronize_rcu(); |
a2b2ed2c AM |
470 | |
471 | list_for_each_entry(handle, &dev->h_list, d_node) | |
8006479c | 472 | if (handle->open && handle->handler->start) |
c7e8dc6e DT |
473 | handle->handler->start(handle); |
474 | } | |
1da177e4 | 475 | } |
8006479c DT |
476 | |
477 | /** | |
478 | * input_release_device - release previously grabbed device | |
479 | * @handle: input handle that owns the device | |
480 | * | |
481 | * Releases previously grabbed device so that other input handles can | |
482 | * start receiving input events. Upon release all handlers attached | |
483 | * to the device have their start() method called so they have a change | |
484 | * to synchronize device state with the rest of the system. | |
485 | */ | |
486 | void input_release_device(struct input_handle *handle) | |
487 | { | |
488 | struct input_dev *dev = handle->dev; | |
489 | ||
490 | mutex_lock(&dev->mutex); | |
491 | __input_release_device(handle); | |
492 | mutex_unlock(&dev->mutex); | |
493 | } | |
ca56fe07 | 494 | EXPORT_SYMBOL(input_release_device); |
1da177e4 | 495 | |
8006479c DT |
496 | /** |
497 | * input_open_device - open input device | |
498 | * @handle: handle through which device is being accessed | |
499 | * | |
500 | * This function should be called by input handlers when they | |
501 | * want to start receive events from given input device. | |
502 | */ | |
1da177e4 LT |
503 | int input_open_device(struct input_handle *handle) |
504 | { | |
0fbf87ca | 505 | struct input_dev *dev = handle->dev; |
8006479c | 506 | int retval; |
0fbf87ca | 507 | |
8006479c DT |
508 | retval = mutex_lock_interruptible(&dev->mutex); |
509 | if (retval) | |
510 | return retval; | |
511 | ||
512 | if (dev->going_away) { | |
513 | retval = -ENODEV; | |
514 | goto out; | |
515 | } | |
0fbf87ca | 516 | |
1da177e4 | 517 | handle->open++; |
0fbf87ca DT |
518 | |
519 | if (!dev->users++ && dev->open) | |
8006479c DT |
520 | retval = dev->open(dev); |
521 | ||
522 | if (retval) { | |
523 | dev->users--; | |
524 | if (!--handle->open) { | |
525 | /* | |
526 | * Make sure we are not delivering any more events | |
527 | * through this handle | |
528 | */ | |
82ba56c2 | 529 | synchronize_rcu(); |
8006479c DT |
530 | } |
531 | } | |
0fbf87ca | 532 | |
8006479c | 533 | out: |
e676c232 | 534 | mutex_unlock(&dev->mutex); |
8006479c | 535 | return retval; |
1da177e4 | 536 | } |
ca56fe07 | 537 | EXPORT_SYMBOL(input_open_device); |
1da177e4 | 538 | |
8006479c | 539 | int input_flush_device(struct input_handle *handle, struct file *file) |
1da177e4 | 540 | { |
8006479c DT |
541 | struct input_dev *dev = handle->dev; |
542 | int retval; | |
1da177e4 | 543 | |
8006479c DT |
544 | retval = mutex_lock_interruptible(&dev->mutex); |
545 | if (retval) | |
546 | return retval; | |
547 | ||
548 | if (dev->flush) | |
549 | retval = dev->flush(dev, file); | |
550 | ||
551 | mutex_unlock(&dev->mutex); | |
552 | return retval; | |
1da177e4 | 553 | } |
ca56fe07 | 554 | EXPORT_SYMBOL(input_flush_device); |
1da177e4 | 555 | |
8006479c DT |
556 | /** |
557 | * input_close_device - close input device | |
558 | * @handle: handle through which device is being accessed | |
559 | * | |
560 | * This function should be called by input handlers when they | |
561 | * want to stop receive events from given input device. | |
562 | */ | |
1da177e4 LT |
563 | void input_close_device(struct input_handle *handle) |
564 | { | |
0fbf87ca DT |
565 | struct input_dev *dev = handle->dev; |
566 | ||
e676c232 | 567 | mutex_lock(&dev->mutex); |
0fbf87ca | 568 | |
8006479c DT |
569 | __input_release_device(handle); |
570 | ||
0fbf87ca DT |
571 | if (!--dev->users && dev->close) |
572 | dev->close(dev); | |
8006479c DT |
573 | |
574 | if (!--handle->open) { | |
575 | /* | |
82ba56c2 | 576 | * synchronize_rcu() makes sure that input_pass_event() |
8006479c DT |
577 | * completed and that no more input events are delivered |
578 | * through this handle | |
579 | */ | |
82ba56c2 | 580 | synchronize_rcu(); |
8006479c | 581 | } |
0fbf87ca | 582 | |
e676c232 | 583 | mutex_unlock(&dev->mutex); |
1da177e4 | 584 | } |
ca56fe07 | 585 | EXPORT_SYMBOL(input_close_device); |
1da177e4 | 586 | |
866d7d7b ON |
587 | /* |
588 | * Simulate keyup events for all keys that are marked as pressed. | |
589 | * The function must be called with dev->event_lock held. | |
590 | */ | |
591 | static void input_dev_release_keys(struct input_dev *dev) | |
592 | { | |
593 | int code; | |
594 | ||
595 | if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) { | |
596 | for (code = 0; code <= KEY_MAX; code++) { | |
597 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
598 | __test_and_clear_bit(code, dev->key)) { | |
9ae4345a | 599 | input_pass_event(dev, EV_KEY, code, 0); |
866d7d7b ON |
600 | } |
601 | } | |
9ae4345a | 602 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); |
866d7d7b ON |
603 | } |
604 | } | |
605 | ||
8006479c DT |
606 | /* |
607 | * Prepare device for unregistering | |
608 | */ | |
609 | static void input_disconnect_device(struct input_dev *dev) | |
610 | { | |
611 | struct input_handle *handle; | |
8006479c DT |
612 | |
613 | /* | |
614 | * Mark device as going away. Note that we take dev->mutex here | |
615 | * not to protect access to dev->going_away but rather to ensure | |
616 | * that there are no threads in the middle of input_open_device() | |
617 | */ | |
618 | mutex_lock(&dev->mutex); | |
ffd0db97 | 619 | dev->going_away = true; |
8006479c DT |
620 | mutex_unlock(&dev->mutex); |
621 | ||
622 | spin_lock_irq(&dev->event_lock); | |
623 | ||
624 | /* | |
625 | * Simulate keyup events for all pressed keys so that handlers | |
626 | * are not left with "stuck" keys. The driver may continue | |
627 | * generate events even after we done here but they will not | |
628 | * reach any handlers. | |
629 | */ | |
866d7d7b | 630 | input_dev_release_keys(dev); |
8006479c DT |
631 | |
632 | list_for_each_entry(handle, &dev->h_list, d_node) | |
633 | handle->open = 0; | |
634 | ||
635 | spin_unlock_irq(&dev->event_lock); | |
636 | } | |
637 | ||
8613e4c2 MCC |
638 | /** |
639 | * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry | |
640 | * @ke: keymap entry containing scancode to be converted. | |
641 | * @scancode: pointer to the location where converted scancode should | |
642 | * be stored. | |
643 | * | |
644 | * This function is used to convert scancode stored in &struct keymap_entry | |
645 | * into scalar form understood by legacy keymap handling methods. These | |
646 | * methods expect scancodes to be represented as 'unsigned int'. | |
647 | */ | |
648 | int input_scancode_to_scalar(const struct input_keymap_entry *ke, | |
649 | unsigned int *scancode) | |
650 | { | |
651 | switch (ke->len) { | |
652 | case 1: | |
653 | *scancode = *((u8 *)ke->scancode); | |
654 | break; | |
655 | ||
656 | case 2: | |
657 | *scancode = *((u16 *)ke->scancode); | |
658 | break; | |
659 | ||
660 | case 4: | |
661 | *scancode = *((u32 *)ke->scancode); | |
662 | break; | |
663 | ||
664 | default: | |
665 | return -EINVAL; | |
666 | } | |
667 | ||
668 | return 0; | |
669 | } | |
670 | EXPORT_SYMBOL(input_scancode_to_scalar); | |
671 | ||
672 | /* | |
673 | * Those routines handle the default case where no [gs]etkeycode() is | |
674 | * defined. In this case, an array indexed by the scancode is used. | |
675 | */ | |
676 | ||
677 | static unsigned int input_fetch_keycode(struct input_dev *dev, | |
678 | unsigned int index) | |
c8e4c772 MR |
679 | { |
680 | switch (dev->keycodesize) { | |
8613e4c2 MCC |
681 | case 1: |
682 | return ((u8 *)dev->keycode)[index]; | |
c8e4c772 | 683 | |
8613e4c2 MCC |
684 | case 2: |
685 | return ((u16 *)dev->keycode)[index]; | |
c8e4c772 | 686 | |
8613e4c2 MCC |
687 | default: |
688 | return ((u32 *)dev->keycode)[index]; | |
c8e4c772 MR |
689 | } |
690 | } | |
691 | ||
692 | static int input_default_getkeycode(struct input_dev *dev, | |
8613e4c2 | 693 | struct input_keymap_entry *ke) |
c8e4c772 | 694 | { |
8613e4c2 MCC |
695 | unsigned int index; |
696 | int error; | |
697 | ||
c8e4c772 MR |
698 | if (!dev->keycodesize) |
699 | return -EINVAL; | |
700 | ||
8613e4c2 MCC |
701 | if (ke->flags & INPUT_KEYMAP_BY_INDEX) |
702 | index = ke->index; | |
703 | else { | |
704 | error = input_scancode_to_scalar(ke, &index); | |
705 | if (error) | |
706 | return error; | |
707 | } | |
708 | ||
709 | if (index >= dev->keycodemax) | |
c8e4c772 MR |
710 | return -EINVAL; |
711 | ||
8613e4c2 MCC |
712 | ke->keycode = input_fetch_keycode(dev, index); |
713 | ke->index = index; | |
714 | ke->len = sizeof(index); | |
715 | memcpy(ke->scancode, &index, sizeof(index)); | |
c8e4c772 MR |
716 | |
717 | return 0; | |
718 | } | |
719 | ||
720 | static int input_default_setkeycode(struct input_dev *dev, | |
8613e4c2 MCC |
721 | const struct input_keymap_entry *ke, |
722 | unsigned int *old_keycode) | |
c8e4c772 | 723 | { |
8613e4c2 MCC |
724 | unsigned int index; |
725 | int error; | |
c8e4c772 MR |
726 | int i; |
727 | ||
8613e4c2 | 728 | if (!dev->keycodesize) |
c8e4c772 MR |
729 | return -EINVAL; |
730 | ||
8613e4c2 MCC |
731 | if (ke->flags & INPUT_KEYMAP_BY_INDEX) { |
732 | index = ke->index; | |
733 | } else { | |
734 | error = input_scancode_to_scalar(ke, &index); | |
735 | if (error) | |
736 | return error; | |
737 | } | |
738 | ||
739 | if (index >= dev->keycodemax) | |
c8e4c772 MR |
740 | return -EINVAL; |
741 | ||
de391d12 | 742 | if (dev->keycodesize < sizeof(ke->keycode) && |
8613e4c2 | 743 | (ke->keycode >> (dev->keycodesize * 8))) |
c8e4c772 MR |
744 | return -EINVAL; |
745 | ||
746 | switch (dev->keycodesize) { | |
747 | case 1: { | |
748 | u8 *k = (u8 *)dev->keycode; | |
8613e4c2 MCC |
749 | *old_keycode = k[index]; |
750 | k[index] = ke->keycode; | |
c8e4c772 MR |
751 | break; |
752 | } | |
753 | case 2: { | |
754 | u16 *k = (u16 *)dev->keycode; | |
8613e4c2 MCC |
755 | *old_keycode = k[index]; |
756 | k[index] = ke->keycode; | |
c8e4c772 MR |
757 | break; |
758 | } | |
759 | default: { | |
760 | u32 *k = (u32 *)dev->keycode; | |
8613e4c2 MCC |
761 | *old_keycode = k[index]; |
762 | k[index] = ke->keycode; | |
c8e4c772 MR |
763 | break; |
764 | } | |
765 | } | |
766 | ||
8613e4c2 MCC |
767 | __clear_bit(*old_keycode, dev->keybit); |
768 | __set_bit(ke->keycode, dev->keybit); | |
c8e4c772 MR |
769 | |
770 | for (i = 0; i < dev->keycodemax; i++) { | |
8613e4c2 MCC |
771 | if (input_fetch_keycode(dev, i) == *old_keycode) { |
772 | __set_bit(*old_keycode, dev->keybit); | |
c8e4c772 MR |
773 | break; /* Setting the bit twice is useless, so break */ |
774 | } | |
775 | } | |
776 | ||
777 | return 0; | |
778 | } | |
779 | ||
f4f37c8e DT |
780 | /** |
781 | * input_get_keycode - retrieve keycode currently mapped to a given scancode | |
782 | * @dev: input device which keymap is being queried | |
8613e4c2 | 783 | * @ke: keymap entry |
f4f37c8e DT |
784 | * |
785 | * This function should be called by anyone interested in retrieving current | |
8613e4c2 | 786 | * keymap. Presently evdev handlers use it. |
f4f37c8e | 787 | */ |
8613e4c2 | 788 | int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke) |
f4f37c8e | 789 | { |
2e2e3b96 DT |
790 | unsigned long flags; |
791 | int retval; | |
792 | ||
793 | spin_lock_irqsave(&dev->event_lock, flags); | |
2e2e3b96 | 794 | |
8613e4c2 MCC |
795 | if (dev->getkeycode) { |
796 | /* | |
797 | * Support for legacy drivers, that don't implement the new | |
798 | * ioctls | |
799 | */ | |
800 | u32 scancode = ke->index; | |
801 | ||
802 | memcpy(ke->scancode, &scancode, sizeof(scancode)); | |
803 | ke->len = sizeof(scancode); | |
804 | retval = dev->getkeycode(dev, scancode, &ke->keycode); | |
805 | } else { | |
806 | retval = dev->getkeycode_new(dev, ke); | |
807 | } | |
808 | ||
809 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
2e2e3b96 | 810 | return retval; |
f4f37c8e DT |
811 | } |
812 | EXPORT_SYMBOL(input_get_keycode); | |
813 | ||
814 | /** | |
8613e4c2 | 815 | * input_set_keycode - attribute a keycode to a given scancode |
f4f37c8e | 816 | * @dev: input device which keymap is being updated |
8613e4c2 | 817 | * @ke: new keymap entry |
f4f37c8e DT |
818 | * |
819 | * This function should be called by anyone needing to update current | |
820 | * keymap. Presently keyboard and evdev handlers use it. | |
821 | */ | |
58b93995 | 822 | int input_set_keycode(struct input_dev *dev, |
8613e4c2 | 823 | const struct input_keymap_entry *ke) |
f4f37c8e DT |
824 | { |
825 | unsigned long flags; | |
fd6cf3dd | 826 | unsigned int old_keycode; |
f4f37c8e DT |
827 | int retval; |
828 | ||
8613e4c2 | 829 | if (ke->keycode > KEY_MAX) |
f4f37c8e DT |
830 | return -EINVAL; |
831 | ||
832 | spin_lock_irqsave(&dev->event_lock, flags); | |
833 | ||
8613e4c2 MCC |
834 | if (dev->setkeycode) { |
835 | /* | |
836 | * Support for legacy drivers, that don't implement the new | |
837 | * ioctls | |
838 | */ | |
839 | unsigned int scancode; | |
840 | ||
841 | retval = input_scancode_to_scalar(ke, &scancode); | |
842 | if (retval) | |
843 | goto out; | |
844 | ||
845 | /* | |
846 | * We need to know the old scancode, in order to generate a | |
847 | * keyup effect, if the set operation happens successfully | |
848 | */ | |
849 | if (!dev->getkeycode) { | |
850 | retval = -EINVAL; | |
851 | goto out; | |
852 | } | |
853 | ||
854 | retval = dev->getkeycode(dev, scancode, &old_keycode); | |
855 | if (retval) | |
856 | goto out; | |
857 | ||
858 | retval = dev->setkeycode(dev, scancode, ke->keycode); | |
859 | } else { | |
860 | retval = dev->setkeycode_new(dev, ke, &old_keycode); | |
861 | } | |
f4f37c8e | 862 | |
f4f37c8e DT |
863 | if (retval) |
864 | goto out; | |
865 | ||
4f93df40 DT |
866 | /* Make sure KEY_RESERVED did not get enabled. */ |
867 | __clear_bit(KEY_RESERVED, dev->keybit); | |
868 | ||
f4f37c8e DT |
869 | /* |
870 | * Simulate keyup event if keycode is not present | |
871 | * in the keymap anymore | |
872 | */ | |
873 | if (test_bit(EV_KEY, dev->evbit) && | |
874 | !is_event_supported(old_keycode, dev->keybit, KEY_MAX) && | |
875 | __test_and_clear_bit(old_keycode, dev->key)) { | |
876 | ||
9ae4345a | 877 | input_pass_event(dev, EV_KEY, old_keycode, 0); |
f4f37c8e | 878 | if (dev->sync) |
9ae4345a | 879 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); |
f4f37c8e DT |
880 | } |
881 | ||
882 | out: | |
883 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
884 | ||
885 | return retval; | |
886 | } | |
887 | EXPORT_SYMBOL(input_set_keycode); | |
c8e4c772 | 888 | |
1da177e4 | 889 | #define MATCH_BIT(bit, max) \ |
7b19ada2 | 890 | for (i = 0; i < BITS_TO_LONGS(max); i++) \ |
1da177e4 LT |
891 | if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \ |
892 | break; \ | |
7b19ada2 | 893 | if (i != BITS_TO_LONGS(max)) \ |
1da177e4 LT |
894 | continue; |
895 | ||
0b7024ac | 896 | static const struct input_device_id *input_match_device(struct input_handler *handler, |
66e66118 | 897 | struct input_dev *dev) |
1da177e4 | 898 | { |
0b7024ac | 899 | const struct input_device_id *id; |
1da177e4 LT |
900 | int i; |
901 | ||
0b7024ac | 902 | for (id = handler->id_table; id->flags || id->driver_info; id++) { |
1da177e4 LT |
903 | |
904 | if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) | |
ddc5d341 | 905 | if (id->bustype != dev->id.bustype) |
1da177e4 LT |
906 | continue; |
907 | ||
908 | if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) | |
ddc5d341 | 909 | if (id->vendor != dev->id.vendor) |
1da177e4 LT |
910 | continue; |
911 | ||
912 | if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) | |
ddc5d341 | 913 | if (id->product != dev->id.product) |
1da177e4 LT |
914 | continue; |
915 | ||
916 | if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) | |
ddc5d341 | 917 | if (id->version != dev->id.version) |
1da177e4 LT |
918 | continue; |
919 | ||
920 | MATCH_BIT(evbit, EV_MAX); | |
921 | MATCH_BIT(keybit, KEY_MAX); | |
922 | MATCH_BIT(relbit, REL_MAX); | |
923 | MATCH_BIT(absbit, ABS_MAX); | |
924 | MATCH_BIT(mscbit, MSC_MAX); | |
925 | MATCH_BIT(ledbit, LED_MAX); | |
926 | MATCH_BIT(sndbit, SND_MAX); | |
927 | MATCH_BIT(ffbit, FF_MAX); | |
ff13f98b | 928 | MATCH_BIT(swbit, SW_MAX); |
1da177e4 | 929 | |
0b7024ac DT |
930 | if (!handler->match || handler->match(handler, dev)) |
931 | return id; | |
1da177e4 LT |
932 | } |
933 | ||
934 | return NULL; | |
935 | } | |
936 | ||
5b2a0826 DT |
937 | static int input_attach_handler(struct input_dev *dev, struct input_handler *handler) |
938 | { | |
939 | const struct input_device_id *id; | |
940 | int error; | |
941 | ||
0b7024ac | 942 | id = input_match_device(handler, dev); |
5b2a0826 DT |
943 | if (!id) |
944 | return -ENODEV; | |
945 | ||
946 | error = handler->connect(handler, dev, id); | |
947 | if (error && error != -ENODEV) | |
da0c4901 JP |
948 | pr_err("failed to attach handler %s to device %s, error: %d\n", |
949 | handler->name, kobject_name(&dev->dev.kobj), error); | |
5b2a0826 DT |
950 | |
951 | return error; | |
952 | } | |
953 | ||
15e184af DT |
954 | #ifdef CONFIG_COMPAT |
955 | ||
956 | static int input_bits_to_string(char *buf, int buf_size, | |
957 | unsigned long bits, bool skip_empty) | |
958 | { | |
959 | int len = 0; | |
960 | ||
961 | if (INPUT_COMPAT_TEST) { | |
962 | u32 dword = bits >> 32; | |
963 | if (dword || !skip_empty) | |
964 | len += snprintf(buf, buf_size, "%x ", dword); | |
965 | ||
966 | dword = bits & 0xffffffffUL; | |
967 | if (dword || !skip_empty || len) | |
968 | len += snprintf(buf + len, max(buf_size - len, 0), | |
969 | "%x", dword); | |
970 | } else { | |
971 | if (bits || !skip_empty) | |
972 | len += snprintf(buf, buf_size, "%lx", bits); | |
973 | } | |
974 | ||
975 | return len; | |
976 | } | |
977 | ||
978 | #else /* !CONFIG_COMPAT */ | |
979 | ||
980 | static int input_bits_to_string(char *buf, int buf_size, | |
981 | unsigned long bits, bool skip_empty) | |
982 | { | |
983 | return bits || !skip_empty ? | |
984 | snprintf(buf, buf_size, "%lx", bits) : 0; | |
985 | } | |
986 | ||
987 | #endif | |
5b2a0826 | 988 | |
f96b434d DT |
989 | #ifdef CONFIG_PROC_FS |
990 | ||
991 | static struct proc_dir_entry *proc_bus_input_dir; | |
992 | static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); | |
993 | static int input_devices_state; | |
994 | ||
995 | static inline void input_wakeup_procfs_readers(void) | |
996 | { | |
997 | input_devices_state++; | |
998 | wake_up(&input_devices_poll_wait); | |
999 | } | |
1000 | ||
969b21cd | 1001 | static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait) |
f96b434d | 1002 | { |
f96b434d | 1003 | poll_wait(file, &input_devices_poll_wait, wait); |
fa886612 DT |
1004 | if (file->f_version != input_devices_state) { |
1005 | file->f_version = input_devices_state; | |
f96b434d | 1006 | return POLLIN | POLLRDNORM; |
fa886612 | 1007 | } |
1e0afb28 | 1008 | |
f96b434d DT |
1009 | return 0; |
1010 | } | |
1011 | ||
1572ca2a DT |
1012 | union input_seq_state { |
1013 | struct { | |
1014 | unsigned short pos; | |
1015 | bool mutex_acquired; | |
1016 | }; | |
1017 | void *p; | |
1018 | }; | |
1019 | ||
969b21cd DT |
1020 | static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) |
1021 | { | |
1572ca2a DT |
1022 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1023 | int error; | |
1024 | ||
1025 | /* We need to fit into seq->private pointer */ | |
1026 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
1027 | ||
1028 | error = mutex_lock_interruptible(&input_mutex); | |
1029 | if (error) { | |
1030 | state->mutex_acquired = false; | |
1031 | return ERR_PTR(error); | |
1032 | } | |
1033 | ||
1034 | state->mutex_acquired = true; | |
f96b434d | 1035 | |
ad5d972c | 1036 | return seq_list_start(&input_dev_list, *pos); |
969b21cd | 1037 | } |
051b2fea | 1038 | |
969b21cd DT |
1039 | static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1040 | { | |
ad5d972c | 1041 | return seq_list_next(v, &input_dev_list, pos); |
969b21cd | 1042 | } |
f96b434d | 1043 | |
1572ca2a | 1044 | static void input_seq_stop(struct seq_file *seq, void *v) |
969b21cd | 1045 | { |
1572ca2a DT |
1046 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1047 | ||
1048 | if (state->mutex_acquired) | |
1049 | mutex_unlock(&input_mutex); | |
969b21cd | 1050 | } |
f96b434d | 1051 | |
969b21cd DT |
1052 | static void input_seq_print_bitmap(struct seq_file *seq, const char *name, |
1053 | unsigned long *bitmap, int max) | |
1054 | { | |
1055 | int i; | |
15e184af DT |
1056 | bool skip_empty = true; |
1057 | char buf[18]; | |
f96b434d | 1058 | |
969b21cd | 1059 | seq_printf(seq, "B: %s=", name); |
15e184af DT |
1060 | |
1061 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
1062 | if (input_bits_to_string(buf, sizeof(buf), | |
1063 | bitmap[i], skip_empty)) { | |
1064 | skip_empty = false; | |
1065 | seq_printf(seq, "%s%s", buf, i > 0 ? " " : ""); | |
1066 | } | |
1067 | } | |
1068 | ||
1069 | /* | |
1070 | * If no output was produced print a single 0. | |
1071 | */ | |
1072 | if (skip_empty) | |
1073 | seq_puts(seq, "0"); | |
1074 | ||
969b21cd DT |
1075 | seq_putc(seq, '\n'); |
1076 | } | |
f96b434d | 1077 | |
969b21cd DT |
1078 | static int input_devices_seq_show(struct seq_file *seq, void *v) |
1079 | { | |
1080 | struct input_dev *dev = container_of(v, struct input_dev, node); | |
9657d75c | 1081 | const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
969b21cd DT |
1082 | struct input_handle *handle; |
1083 | ||
1084 | seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", | |
1085 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); | |
1086 | ||
1087 | seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); | |
1088 | seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : ""); | |
1089 | seq_printf(seq, "S: Sysfs=%s\n", path ? path : ""); | |
15e03ae8 | 1090 | seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : ""); |
969b21cd DT |
1091 | seq_printf(seq, "H: Handlers="); |
1092 | ||
1093 | list_for_each_entry(handle, &dev->h_list, d_node) | |
1094 | seq_printf(seq, "%s ", handle->name); | |
1095 | seq_putc(seq, '\n'); | |
1096 | ||
85b77200 HR |
1097 | input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX); |
1098 | ||
969b21cd DT |
1099 | input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); |
1100 | if (test_bit(EV_KEY, dev->evbit)) | |
1101 | input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); | |
1102 | if (test_bit(EV_REL, dev->evbit)) | |
1103 | input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); | |
1104 | if (test_bit(EV_ABS, dev->evbit)) | |
1105 | input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); | |
1106 | if (test_bit(EV_MSC, dev->evbit)) | |
1107 | input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); | |
1108 | if (test_bit(EV_LED, dev->evbit)) | |
1109 | input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); | |
1110 | if (test_bit(EV_SND, dev->evbit)) | |
1111 | input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); | |
1112 | if (test_bit(EV_FF, dev->evbit)) | |
1113 | input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); | |
1114 | if (test_bit(EV_SW, dev->evbit)) | |
1115 | input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); | |
1116 | ||
1117 | seq_putc(seq, '\n'); | |
1118 | ||
1119 | kfree(path); | |
1120 | return 0; | |
f96b434d DT |
1121 | } |
1122 | ||
cec69c37 | 1123 | static const struct seq_operations input_devices_seq_ops = { |
969b21cd DT |
1124 | .start = input_devices_seq_start, |
1125 | .next = input_devices_seq_next, | |
1572ca2a | 1126 | .stop = input_seq_stop, |
969b21cd DT |
1127 | .show = input_devices_seq_show, |
1128 | }; | |
1129 | ||
1130 | static int input_proc_devices_open(struct inode *inode, struct file *file) | |
f96b434d | 1131 | { |
969b21cd DT |
1132 | return seq_open(file, &input_devices_seq_ops); |
1133 | } | |
1134 | ||
2b8693c0 | 1135 | static const struct file_operations input_devices_fileops = { |
969b21cd DT |
1136 | .owner = THIS_MODULE, |
1137 | .open = input_proc_devices_open, | |
1138 | .poll = input_proc_devices_poll, | |
1139 | .read = seq_read, | |
1140 | .llseek = seq_lseek, | |
1141 | .release = seq_release, | |
1142 | }; | |
1143 | ||
1144 | static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) | |
1145 | { | |
1572ca2a DT |
1146 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1147 | int error; | |
1148 | ||
1149 | /* We need to fit into seq->private pointer */ | |
1150 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
1151 | ||
1152 | error = mutex_lock_interruptible(&input_mutex); | |
1153 | if (error) { | |
1154 | state->mutex_acquired = false; | |
1155 | return ERR_PTR(error); | |
1156 | } | |
1157 | ||
1158 | state->mutex_acquired = true; | |
1159 | state->pos = *pos; | |
8006479c | 1160 | |
ad5d972c | 1161 | return seq_list_start(&input_handler_list, *pos); |
969b21cd | 1162 | } |
f96b434d | 1163 | |
969b21cd DT |
1164 | static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1165 | { | |
1572ca2a | 1166 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
f96b434d | 1167 | |
1572ca2a DT |
1168 | state->pos = *pos + 1; |
1169 | return seq_list_next(v, &input_handler_list, pos); | |
969b21cd DT |
1170 | } |
1171 | ||
1172 | static int input_handlers_seq_show(struct seq_file *seq, void *v) | |
1173 | { | |
1174 | struct input_handler *handler = container_of(v, struct input_handler, node); | |
1572ca2a | 1175 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
969b21cd | 1176 | |
1572ca2a | 1177 | seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name); |
ef7995f4 DT |
1178 | if (handler->filter) |
1179 | seq_puts(seq, " (filter)"); | |
969b21cd DT |
1180 | if (handler->fops) |
1181 | seq_printf(seq, " Minor=%d", handler->minor); | |
1182 | seq_putc(seq, '\n'); | |
1183 | ||
1184 | return 0; | |
1185 | } | |
1572ca2a | 1186 | |
cec69c37 | 1187 | static const struct seq_operations input_handlers_seq_ops = { |
969b21cd DT |
1188 | .start = input_handlers_seq_start, |
1189 | .next = input_handlers_seq_next, | |
1572ca2a | 1190 | .stop = input_seq_stop, |
969b21cd DT |
1191 | .show = input_handlers_seq_show, |
1192 | }; | |
1193 | ||
1194 | static int input_proc_handlers_open(struct inode *inode, struct file *file) | |
1195 | { | |
1196 | return seq_open(file, &input_handlers_seq_ops); | |
1197 | } | |
1198 | ||
2b8693c0 | 1199 | static const struct file_operations input_handlers_fileops = { |
969b21cd DT |
1200 | .owner = THIS_MODULE, |
1201 | .open = input_proc_handlers_open, | |
1202 | .read = seq_read, | |
1203 | .llseek = seq_lseek, | |
1204 | .release = seq_release, | |
1205 | }; | |
f96b434d DT |
1206 | |
1207 | static int __init input_proc_init(void) | |
1208 | { | |
1209 | struct proc_dir_entry *entry; | |
1210 | ||
9c37066d | 1211 | proc_bus_input_dir = proc_mkdir("bus/input", NULL); |
f96b434d DT |
1212 | if (!proc_bus_input_dir) |
1213 | return -ENOMEM; | |
1214 | ||
c7705f34 DL |
1215 | entry = proc_create("devices", 0, proc_bus_input_dir, |
1216 | &input_devices_fileops); | |
f96b434d DT |
1217 | if (!entry) |
1218 | goto fail1; | |
1219 | ||
c7705f34 DL |
1220 | entry = proc_create("handlers", 0, proc_bus_input_dir, |
1221 | &input_handlers_fileops); | |
f96b434d DT |
1222 | if (!entry) |
1223 | goto fail2; | |
1224 | ||
f96b434d DT |
1225 | return 0; |
1226 | ||
1227 | fail2: remove_proc_entry("devices", proc_bus_input_dir); | |
9c37066d | 1228 | fail1: remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1229 | return -ENOMEM; |
1230 | } | |
1231 | ||
beffbdc2 | 1232 | static void input_proc_exit(void) |
f96b434d DT |
1233 | { |
1234 | remove_proc_entry("devices", proc_bus_input_dir); | |
1235 | remove_proc_entry("handlers", proc_bus_input_dir); | |
9c37066d | 1236 | remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1237 | } |
1238 | ||
1239 | #else /* !CONFIG_PROC_FS */ | |
1240 | static inline void input_wakeup_procfs_readers(void) { } | |
1241 | static inline int input_proc_init(void) { return 0; } | |
1242 | static inline void input_proc_exit(void) { } | |
1243 | #endif | |
1244 | ||
9657d75c DT |
1245 | #define INPUT_DEV_STRING_ATTR_SHOW(name) \ |
1246 | static ssize_t input_dev_show_##name(struct device *dev, \ | |
1247 | struct device_attribute *attr, \ | |
1248 | char *buf) \ | |
1249 | { \ | |
1250 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1251 | \ | |
1252 | return scnprintf(buf, PAGE_SIZE, "%s\n", \ | |
1253 | input_dev->name ? input_dev->name : ""); \ | |
1254 | } \ | |
1255 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL) | |
5c1e9a6a DT |
1256 | |
1257 | INPUT_DEV_STRING_ATTR_SHOW(name); | |
1258 | INPUT_DEV_STRING_ATTR_SHOW(phys); | |
1259 | INPUT_DEV_STRING_ATTR_SHOW(uniq); | |
1260 | ||
ac648a6a DT |
1261 | static int input_print_modalias_bits(char *buf, int size, |
1262 | char name, unsigned long *bm, | |
1263 | unsigned int min_bit, unsigned int max_bit) | |
1d8f430c | 1264 | { |
ac648a6a | 1265 | int len = 0, i; |
1d8f430c | 1266 | |
ac648a6a DT |
1267 | len += snprintf(buf, max(size, 0), "%c", name); |
1268 | for (i = min_bit; i < max_bit; i++) | |
7b19ada2 | 1269 | if (bm[BIT_WORD(i)] & BIT_MASK(i)) |
ac648a6a | 1270 | len += snprintf(buf + len, max(size - len, 0), "%X,", i); |
1d8f430c RR |
1271 | return len; |
1272 | } | |
1273 | ||
2db66876 DT |
1274 | static int input_print_modalias(char *buf, int size, struct input_dev *id, |
1275 | int add_cr) | |
1d8f430c | 1276 | { |
bd37e5a9 | 1277 | int len; |
1d8f430c | 1278 | |
ac648a6a DT |
1279 | len = snprintf(buf, max(size, 0), |
1280 | "input:b%04Xv%04Xp%04Xe%04X-", | |
1281 | id->id.bustype, id->id.vendor, | |
1282 | id->id.product, id->id.version); | |
1283 | ||
1284 | len += input_print_modalias_bits(buf + len, size - len, | |
1285 | 'e', id->evbit, 0, EV_MAX); | |
1286 | len += input_print_modalias_bits(buf + len, size - len, | |
1287 | 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); | |
1288 | len += input_print_modalias_bits(buf + len, size - len, | |
1289 | 'r', id->relbit, 0, REL_MAX); | |
1290 | len += input_print_modalias_bits(buf + len, size - len, | |
1291 | 'a', id->absbit, 0, ABS_MAX); | |
1292 | len += input_print_modalias_bits(buf + len, size - len, | |
1293 | 'm', id->mscbit, 0, MSC_MAX); | |
1294 | len += input_print_modalias_bits(buf + len, size - len, | |
1295 | 'l', id->ledbit, 0, LED_MAX); | |
1296 | len += input_print_modalias_bits(buf + len, size - len, | |
1297 | 's', id->sndbit, 0, SND_MAX); | |
1298 | len += input_print_modalias_bits(buf + len, size - len, | |
1299 | 'f', id->ffbit, 0, FF_MAX); | |
1300 | len += input_print_modalias_bits(buf + len, size - len, | |
1301 | 'w', id->swbit, 0, SW_MAX); | |
2db66876 DT |
1302 | |
1303 | if (add_cr) | |
ac648a6a | 1304 | len += snprintf(buf + len, max(size - len, 0), "\n"); |
2db66876 | 1305 | |
bd37e5a9 KS |
1306 | return len; |
1307 | } | |
1308 | ||
9657d75c DT |
1309 | static ssize_t input_dev_show_modalias(struct device *dev, |
1310 | struct device_attribute *attr, | |
1311 | char *buf) | |
bd37e5a9 KS |
1312 | { |
1313 | struct input_dev *id = to_input_dev(dev); | |
1314 | ssize_t len; | |
1315 | ||
2db66876 DT |
1316 | len = input_print_modalias(buf, PAGE_SIZE, id, 1); |
1317 | ||
8a3cf456 | 1318 | return min_t(int, len, PAGE_SIZE); |
1d8f430c | 1319 | } |
9657d75c | 1320 | static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); |
1d8f430c | 1321 | |
85b77200 HR |
1322 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1323 | int max, int add_cr); | |
1324 | ||
1325 | static ssize_t input_dev_show_properties(struct device *dev, | |
1326 | struct device_attribute *attr, | |
1327 | char *buf) | |
1328 | { | |
1329 | struct input_dev *input_dev = to_input_dev(dev); | |
1330 | int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit, | |
1331 | INPUT_PROP_MAX, true); | |
1332 | return min_t(int, len, PAGE_SIZE); | |
1333 | } | |
1334 | static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL); | |
1335 | ||
629b77a4 | 1336 | static struct attribute *input_dev_attrs[] = { |
9657d75c DT |
1337 | &dev_attr_name.attr, |
1338 | &dev_attr_phys.attr, | |
1339 | &dev_attr_uniq.attr, | |
1340 | &dev_attr_modalias.attr, | |
85b77200 | 1341 | &dev_attr_properties.attr, |
629b77a4 GKH |
1342 | NULL |
1343 | }; | |
1344 | ||
bd0ef235 | 1345 | static struct attribute_group input_dev_attr_group = { |
629b77a4 | 1346 | .attrs = input_dev_attrs, |
5c1e9a6a DT |
1347 | }; |
1348 | ||
9657d75c DT |
1349 | #define INPUT_DEV_ID_ATTR(name) \ |
1350 | static ssize_t input_dev_show_id_##name(struct device *dev, \ | |
1351 | struct device_attribute *attr, \ | |
1352 | char *buf) \ | |
1353 | { \ | |
1354 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1355 | return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \ | |
1356 | } \ | |
1357 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL) | |
5c1e9a6a DT |
1358 | |
1359 | INPUT_DEV_ID_ATTR(bustype); | |
1360 | INPUT_DEV_ID_ATTR(vendor); | |
1361 | INPUT_DEV_ID_ATTR(product); | |
1362 | INPUT_DEV_ID_ATTR(version); | |
1363 | ||
1364 | static struct attribute *input_dev_id_attrs[] = { | |
9657d75c DT |
1365 | &dev_attr_bustype.attr, |
1366 | &dev_attr_vendor.attr, | |
1367 | &dev_attr_product.attr, | |
1368 | &dev_attr_version.attr, | |
5c1e9a6a DT |
1369 | NULL |
1370 | }; | |
1371 | ||
1372 | static struct attribute_group input_dev_id_attr_group = { | |
1373 | .name = "id", | |
1374 | .attrs = input_dev_id_attrs, | |
1375 | }; | |
1376 | ||
969b21cd DT |
1377 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1378 | int max, int add_cr) | |
1379 | { | |
1380 | int i; | |
1381 | int len = 0; | |
15e184af DT |
1382 | bool skip_empty = true; |
1383 | ||
1384 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
1385 | len += input_bits_to_string(buf + len, max(buf_size - len, 0), | |
1386 | bitmap[i], skip_empty); | |
1387 | if (len) { | |
1388 | skip_empty = false; | |
1389 | if (i > 0) | |
1390 | len += snprintf(buf + len, max(buf_size - len, 0), " "); | |
1391 | } | |
1392 | } | |
969b21cd | 1393 | |
15e184af DT |
1394 | /* |
1395 | * If no output was produced print a single 0. | |
1396 | */ | |
1397 | if (len == 0) | |
1398 | len = snprintf(buf, buf_size, "%d", 0); | |
969b21cd DT |
1399 | |
1400 | if (add_cr) | |
1401 | len += snprintf(buf + len, max(buf_size - len, 0), "\n"); | |
1402 | ||
1403 | return len; | |
1404 | } | |
1405 | ||
9657d75c DT |
1406 | #define INPUT_DEV_CAP_ATTR(ev, bm) \ |
1407 | static ssize_t input_dev_show_cap_##bm(struct device *dev, \ | |
1408 | struct device_attribute *attr, \ | |
1409 | char *buf) \ | |
1410 | { \ | |
1411 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1412 | int len = input_print_bitmap(buf, PAGE_SIZE, \ | |
15e184af DT |
1413 | input_dev->bm##bit, ev##_MAX, \ |
1414 | true); \ | |
9657d75c DT |
1415 | return min_t(int, len, PAGE_SIZE); \ |
1416 | } \ | |
1417 | static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL) | |
5c1e9a6a DT |
1418 | |
1419 | INPUT_DEV_CAP_ATTR(EV, ev); | |
1420 | INPUT_DEV_CAP_ATTR(KEY, key); | |
1421 | INPUT_DEV_CAP_ATTR(REL, rel); | |
1422 | INPUT_DEV_CAP_ATTR(ABS, abs); | |
1423 | INPUT_DEV_CAP_ATTR(MSC, msc); | |
1424 | INPUT_DEV_CAP_ATTR(LED, led); | |
1425 | INPUT_DEV_CAP_ATTR(SND, snd); | |
1426 | INPUT_DEV_CAP_ATTR(FF, ff); | |
1427 | INPUT_DEV_CAP_ATTR(SW, sw); | |
1428 | ||
1429 | static struct attribute *input_dev_caps_attrs[] = { | |
9657d75c DT |
1430 | &dev_attr_ev.attr, |
1431 | &dev_attr_key.attr, | |
1432 | &dev_attr_rel.attr, | |
1433 | &dev_attr_abs.attr, | |
1434 | &dev_attr_msc.attr, | |
1435 | &dev_attr_led.attr, | |
1436 | &dev_attr_snd.attr, | |
1437 | &dev_attr_ff.attr, | |
1438 | &dev_attr_sw.attr, | |
5c1e9a6a DT |
1439 | NULL |
1440 | }; | |
1441 | ||
1442 | static struct attribute_group input_dev_caps_attr_group = { | |
1443 | .name = "capabilities", | |
1444 | .attrs = input_dev_caps_attrs, | |
1445 | }; | |
1446 | ||
a4dbd674 | 1447 | static const struct attribute_group *input_dev_attr_groups[] = { |
cb9def4d DT |
1448 | &input_dev_attr_group, |
1449 | &input_dev_id_attr_group, | |
1450 | &input_dev_caps_attr_group, | |
1451 | NULL | |
1452 | }; | |
1453 | ||
9657d75c | 1454 | static void input_dev_release(struct device *device) |
d19fbe8a | 1455 | { |
9657d75c | 1456 | struct input_dev *dev = to_input_dev(device); |
d19fbe8a | 1457 | |
509ca1a9 | 1458 | input_ff_destroy(dev); |
40d007e7 | 1459 | input_mt_destroy_slots(dev); |
d31b2865 | 1460 | kfree(dev->absinfo); |
d19fbe8a | 1461 | kfree(dev); |
509ca1a9 | 1462 | |
d19fbe8a DT |
1463 | module_put(THIS_MODULE); |
1464 | } | |
1465 | ||
a7fadbe1 | 1466 | /* |
312c004d | 1467 | * Input uevent interface - loading event handlers based on |
a7fadbe1 DT |
1468 | * device bitfields. |
1469 | */ | |
7eff2e7a | 1470 | static int input_add_uevent_bm_var(struct kobj_uevent_env *env, |
ac648a6a | 1471 | const char *name, unsigned long *bitmap, int max) |
a7fadbe1 | 1472 | { |
7eff2e7a | 1473 | int len; |
a7fadbe1 | 1474 | |
fcd3027a | 1475 | if (add_uevent_var(env, "%s", name)) |
a7fadbe1 DT |
1476 | return -ENOMEM; |
1477 | ||
7eff2e7a KS |
1478 | len = input_print_bitmap(&env->buf[env->buflen - 1], |
1479 | sizeof(env->buf) - env->buflen, | |
15e184af | 1480 | bitmap, max, false); |
7eff2e7a | 1481 | if (len >= (sizeof(env->buf) - env->buflen)) |
a7fadbe1 DT |
1482 | return -ENOMEM; |
1483 | ||
7eff2e7a | 1484 | env->buflen += len; |
a7fadbe1 DT |
1485 | return 0; |
1486 | } | |
1487 | ||
7eff2e7a | 1488 | static int input_add_uevent_modalias_var(struct kobj_uevent_env *env, |
ac648a6a DT |
1489 | struct input_dev *dev) |
1490 | { | |
7eff2e7a | 1491 | int len; |
ac648a6a | 1492 | |
7eff2e7a | 1493 | if (add_uevent_var(env, "MODALIAS=")) |
ac648a6a DT |
1494 | return -ENOMEM; |
1495 | ||
7eff2e7a KS |
1496 | len = input_print_modalias(&env->buf[env->buflen - 1], |
1497 | sizeof(env->buf) - env->buflen, | |
1498 | dev, 0); | |
1499 | if (len >= (sizeof(env->buf) - env->buflen)) | |
ac648a6a DT |
1500 | return -ENOMEM; |
1501 | ||
7eff2e7a | 1502 | env->buflen += len; |
ac648a6a DT |
1503 | return 0; |
1504 | } | |
1505 | ||
a7fadbe1 DT |
1506 | #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \ |
1507 | do { \ | |
7eff2e7a | 1508 | int err = add_uevent_var(env, fmt, val); \ |
a7fadbe1 DT |
1509 | if (err) \ |
1510 | return err; \ | |
1511 | } while (0) | |
1512 | ||
1513 | #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \ | |
1514 | do { \ | |
7eff2e7a | 1515 | int err = input_add_uevent_bm_var(env, name, bm, max); \ |
a7fadbe1 DT |
1516 | if (err) \ |
1517 | return err; \ | |
1518 | } while (0) | |
1519 | ||
ac648a6a DT |
1520 | #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \ |
1521 | do { \ | |
7eff2e7a | 1522 | int err = input_add_uevent_modalias_var(env, dev); \ |
ac648a6a DT |
1523 | if (err) \ |
1524 | return err; \ | |
1525 | } while (0) | |
1526 | ||
7eff2e7a | 1527 | static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env) |
a7fadbe1 | 1528 | { |
9657d75c | 1529 | struct input_dev *dev = to_input_dev(device); |
a7fadbe1 DT |
1530 | |
1531 | INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x", | |
1532 | dev->id.bustype, dev->id.vendor, | |
1533 | dev->id.product, dev->id.version); | |
1534 | if (dev->name) | |
1535 | INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); | |
1536 | if (dev->phys) | |
1537 | INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); | |
08de1f04 | 1538 | if (dev->uniq) |
a7fadbe1 DT |
1539 | INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); |
1540 | ||
85b77200 HR |
1541 | INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX); |
1542 | ||
a7fadbe1 DT |
1543 | INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX); |
1544 | if (test_bit(EV_KEY, dev->evbit)) | |
1545 | INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX); | |
1546 | if (test_bit(EV_REL, dev->evbit)) | |
1547 | INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX); | |
1548 | if (test_bit(EV_ABS, dev->evbit)) | |
1549 | INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX); | |
1550 | if (test_bit(EV_MSC, dev->evbit)) | |
1551 | INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX); | |
1552 | if (test_bit(EV_LED, dev->evbit)) | |
1553 | INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX); | |
1554 | if (test_bit(EV_SND, dev->evbit)) | |
1555 | INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX); | |
1556 | if (test_bit(EV_FF, dev->evbit)) | |
1557 | INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX); | |
1558 | if (test_bit(EV_SW, dev->evbit)) | |
1559 | INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); | |
1560 | ||
ac648a6a | 1561 | INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); |
a7fadbe1 DT |
1562 | |
1563 | return 0; | |
1564 | } | |
1565 | ||
3cc96351 DT |
1566 | #define INPUT_DO_TOGGLE(dev, type, bits, on) \ |
1567 | do { \ | |
1568 | int i; \ | |
1569 | bool active; \ | |
1570 | \ | |
1571 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1572 | break; \ | |
1573 | \ | |
1574 | for (i = 0; i < type##_MAX; i++) { \ | |
1575 | if (!test_bit(i, dev->bits##bit)) \ | |
1576 | continue; \ | |
1577 | \ | |
1578 | active = test_bit(i, dev->bits); \ | |
1579 | if (!active && !on) \ | |
1580 | continue; \ | |
1581 | \ | |
1582 | dev->event(dev, EV_##type, i, on ? active : 0); \ | |
1583 | } \ | |
ffd0db97 DT |
1584 | } while (0) |
1585 | ||
b50b5216 | 1586 | static void input_dev_toggle(struct input_dev *dev, bool activate) |
ffd0db97 DT |
1587 | { |
1588 | if (!dev->event) | |
1589 | return; | |
1590 | ||
1591 | INPUT_DO_TOGGLE(dev, LED, led, activate); | |
1592 | INPUT_DO_TOGGLE(dev, SND, snd, activate); | |
1593 | ||
1594 | if (activate && test_bit(EV_REP, dev->evbit)) { | |
1595 | dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]); | |
1596 | dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]); | |
1597 | } | |
1598 | } | |
1599 | ||
b50b5216 DT |
1600 | /** |
1601 | * input_reset_device() - reset/restore the state of input device | |
1602 | * @dev: input device whose state needs to be reset | |
1603 | * | |
1604 | * This function tries to reset the state of an opened input device and | |
1605 | * bring internal state and state if the hardware in sync with each other. | |
1606 | * We mark all keys as released, restore LED state, repeat rate, etc. | |
1607 | */ | |
1608 | void input_reset_device(struct input_dev *dev) | |
1609 | { | |
1610 | mutex_lock(&dev->mutex); | |
1611 | ||
1612 | if (dev->users) { | |
1613 | input_dev_toggle(dev, true); | |
1614 | ||
1615 | /* | |
1616 | * Keys that have been pressed at suspend time are unlikely | |
1617 | * to be still pressed when we resume. | |
1618 | */ | |
1619 | spin_lock_irq(&dev->event_lock); | |
1620 | input_dev_release_keys(dev); | |
1621 | spin_unlock_irq(&dev->event_lock); | |
1622 | } | |
1623 | ||
1624 | mutex_unlock(&dev->mutex); | |
1625 | } | |
1626 | EXPORT_SYMBOL(input_reset_device); | |
1627 | ||
1628 | #ifdef CONFIG_PM | |
ffd0db97 DT |
1629 | static int input_dev_suspend(struct device *dev) |
1630 | { | |
1631 | struct input_dev *input_dev = to_input_dev(dev); | |
1632 | ||
1633 | mutex_lock(&input_dev->mutex); | |
b50b5216 DT |
1634 | |
1635 | if (input_dev->users) | |
1636 | input_dev_toggle(input_dev, false); | |
1637 | ||
ffd0db97 DT |
1638 | mutex_unlock(&input_dev->mutex); |
1639 | ||
1640 | return 0; | |
1641 | } | |
1642 | ||
1643 | static int input_dev_resume(struct device *dev) | |
1644 | { | |
1645 | struct input_dev *input_dev = to_input_dev(dev); | |
1646 | ||
b50b5216 | 1647 | input_reset_device(input_dev); |
ffd0db97 DT |
1648 | |
1649 | return 0; | |
1650 | } | |
1651 | ||
1652 | static const struct dev_pm_ops input_dev_pm_ops = { | |
1653 | .suspend = input_dev_suspend, | |
1654 | .resume = input_dev_resume, | |
1655 | .poweroff = input_dev_suspend, | |
1656 | .restore = input_dev_resume, | |
1657 | }; | |
1658 | #endif /* CONFIG_PM */ | |
1659 | ||
9657d75c DT |
1660 | static struct device_type input_dev_type = { |
1661 | .groups = input_dev_attr_groups, | |
1662 | .release = input_dev_release, | |
1663 | .uevent = input_dev_uevent, | |
ffd0db97 DT |
1664 | #ifdef CONFIG_PM |
1665 | .pm = &input_dev_pm_ops, | |
1666 | #endif | |
9657d75c DT |
1667 | }; |
1668 | ||
e454cea2 | 1669 | static char *input_devnode(struct device *dev, mode_t *mode) |
aa5ed63e KS |
1670 | { |
1671 | return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev)); | |
1672 | } | |
1673 | ||
ea9f240b | 1674 | struct class input_class = { |
9657d75c | 1675 | .name = "input", |
e454cea2 | 1676 | .devnode = input_devnode, |
d19fbe8a | 1677 | }; |
ca56fe07 | 1678 | EXPORT_SYMBOL_GPL(input_class); |
d19fbe8a | 1679 | |
1447190e DT |
1680 | /** |
1681 | * input_allocate_device - allocate memory for new input device | |
1682 | * | |
1683 | * Returns prepared struct input_dev or NULL. | |
1684 | * | |
1685 | * NOTE: Use input_free_device() to free devices that have not been | |
1686 | * registered; input_unregister_device() should be used for already | |
1687 | * registered devices. | |
1688 | */ | |
d19fbe8a DT |
1689 | struct input_dev *input_allocate_device(void) |
1690 | { | |
1691 | struct input_dev *dev; | |
1692 | ||
1693 | dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); | |
1694 | if (dev) { | |
9657d75c DT |
1695 | dev->dev.type = &input_dev_type; |
1696 | dev->dev.class = &input_class; | |
1697 | device_initialize(&dev->dev); | |
f60d2b11 | 1698 | mutex_init(&dev->mutex); |
8006479c | 1699 | spin_lock_init(&dev->event_lock); |
d19fbe8a DT |
1700 | INIT_LIST_HEAD(&dev->h_list); |
1701 | INIT_LIST_HEAD(&dev->node); | |
655816e4 DT |
1702 | |
1703 | __module_get(THIS_MODULE); | |
d19fbe8a DT |
1704 | } |
1705 | ||
1706 | return dev; | |
1707 | } | |
ca56fe07 | 1708 | EXPORT_SYMBOL(input_allocate_device); |
d19fbe8a | 1709 | |
1447190e DT |
1710 | /** |
1711 | * input_free_device - free memory occupied by input_dev structure | |
1712 | * @dev: input device to free | |
1713 | * | |
1714 | * This function should only be used if input_register_device() | |
1715 | * was not called yet or if it failed. Once device was registered | |
1716 | * use input_unregister_device() and memory will be freed once last | |
8006479c | 1717 | * reference to the device is dropped. |
1447190e DT |
1718 | * |
1719 | * Device should be allocated by input_allocate_device(). | |
1720 | * | |
1721 | * NOTE: If there are references to the input device then memory | |
1722 | * will not be freed until last reference is dropped. | |
1723 | */ | |
f60d2b11 DT |
1724 | void input_free_device(struct input_dev *dev) |
1725 | { | |
54f9e36c | 1726 | if (dev) |
f60d2b11 | 1727 | input_put_device(dev); |
f60d2b11 | 1728 | } |
ca56fe07 | 1729 | EXPORT_SYMBOL(input_free_device); |
f60d2b11 | 1730 | |
534565f2 DT |
1731 | /** |
1732 | * input_set_capability - mark device as capable of a certain event | |
1733 | * @dev: device that is capable of emitting or accepting event | |
1734 | * @type: type of the event (EV_KEY, EV_REL, etc...) | |
1735 | * @code: event code | |
1736 | * | |
1737 | * In addition to setting up corresponding bit in appropriate capability | |
1738 | * bitmap the function also adjusts dev->evbit. | |
1739 | */ | |
1740 | void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code) | |
1741 | { | |
1742 | switch (type) { | |
1743 | case EV_KEY: | |
1744 | __set_bit(code, dev->keybit); | |
1745 | break; | |
1746 | ||
1747 | case EV_REL: | |
1748 | __set_bit(code, dev->relbit); | |
1749 | break; | |
1750 | ||
1751 | case EV_ABS: | |
1752 | __set_bit(code, dev->absbit); | |
1753 | break; | |
1754 | ||
1755 | case EV_MSC: | |
1756 | __set_bit(code, dev->mscbit); | |
1757 | break; | |
1758 | ||
1759 | case EV_SW: | |
1760 | __set_bit(code, dev->swbit); | |
1761 | break; | |
1762 | ||
1763 | case EV_LED: | |
1764 | __set_bit(code, dev->ledbit); | |
1765 | break; | |
1766 | ||
1767 | case EV_SND: | |
1768 | __set_bit(code, dev->sndbit); | |
1769 | break; | |
1770 | ||
1771 | case EV_FF: | |
1772 | __set_bit(code, dev->ffbit); | |
1773 | break; | |
1774 | ||
22d1c398 DB |
1775 | case EV_PWR: |
1776 | /* do nothing */ | |
1777 | break; | |
1778 | ||
534565f2 | 1779 | default: |
da0c4901 JP |
1780 | pr_err("input_set_capability: unknown type %u (code %u)\n", |
1781 | type, code); | |
534565f2 DT |
1782 | dump_stack(); |
1783 | return; | |
1784 | } | |
1785 | ||
1786 | __set_bit(type, dev->evbit); | |
1787 | } | |
1788 | EXPORT_SYMBOL(input_set_capability); | |
1789 | ||
92a3a587 DT |
1790 | #define INPUT_CLEANSE_BITMASK(dev, type, bits) \ |
1791 | do { \ | |
1792 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1793 | memset(dev->bits##bit, 0, \ | |
1794 | sizeof(dev->bits##bit)); \ | |
1795 | } while (0) | |
1796 | ||
1797 | static void input_cleanse_bitmasks(struct input_dev *dev) | |
1798 | { | |
1799 | INPUT_CLEANSE_BITMASK(dev, KEY, key); | |
1800 | INPUT_CLEANSE_BITMASK(dev, REL, rel); | |
1801 | INPUT_CLEANSE_BITMASK(dev, ABS, abs); | |
1802 | INPUT_CLEANSE_BITMASK(dev, MSC, msc); | |
1803 | INPUT_CLEANSE_BITMASK(dev, LED, led); | |
1804 | INPUT_CLEANSE_BITMASK(dev, SND, snd); | |
1805 | INPUT_CLEANSE_BITMASK(dev, FF, ff); | |
1806 | INPUT_CLEANSE_BITMASK(dev, SW, sw); | |
1807 | } | |
1808 | ||
8006479c DT |
1809 | /** |
1810 | * input_register_device - register device with input core | |
1811 | * @dev: device to be registered | |
1812 | * | |
1813 | * This function registers device with input core. The device must be | |
1814 | * allocated with input_allocate_device() and all it's capabilities | |
1815 | * set up before registering. | |
1816 | * If function fails the device must be freed with input_free_device(). | |
1817 | * Once device has been successfully registered it can be unregistered | |
1818 | * with input_unregister_device(); input_free_device() should not be | |
1819 | * called in this case. | |
1820 | */ | |
5f945489 | 1821 | int input_register_device(struct input_dev *dev) |
1da177e4 | 1822 | { |
bd0ef235 | 1823 | static atomic_t input_no = ATOMIC_INIT(0); |
1da177e4 | 1824 | struct input_handler *handler; |
bd0ef235 DT |
1825 | const char *path; |
1826 | int error; | |
1da177e4 | 1827 | |
4f93df40 | 1828 | /* Every input device generates EV_SYN/SYN_REPORT events. */ |
8006479c | 1829 | __set_bit(EV_SYN, dev->evbit); |
0fbf87ca | 1830 | |
4f93df40 DT |
1831 | /* KEY_RESERVED is not supposed to be transmitted to userspace. */ |
1832 | __clear_bit(KEY_RESERVED, dev->keybit); | |
1833 | ||
92a3a587 DT |
1834 | /* Make sure that bitmasks not mentioned in dev->evbit are clean. */ |
1835 | input_cleanse_bitmasks(dev); | |
1836 | ||
1da177e4 LT |
1837 | /* |
1838 | * If delay and period are pre-set by the driver, then autorepeating | |
1839 | * is handled by the driver itself and we don't do it in input.c. | |
1840 | */ | |
1da177e4 LT |
1841 | init_timer(&dev->timer); |
1842 | if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { | |
1843 | dev->timer.data = (long) dev; | |
1844 | dev->timer.function = input_repeat_key; | |
1845 | dev->rep[REP_DELAY] = 250; | |
1846 | dev->rep[REP_PERIOD] = 33; | |
1847 | } | |
1848 | ||
8613e4c2 MCC |
1849 | if (!dev->getkeycode && !dev->getkeycode_new) |
1850 | dev->getkeycode_new = input_default_getkeycode; | |
c8e4c772 | 1851 | |
8613e4c2 MCC |
1852 | if (!dev->setkeycode && !dev->setkeycode_new) |
1853 | dev->setkeycode_new = input_default_setkeycode; | |
c8e4c772 | 1854 | |
a6c2490f KS |
1855 | dev_set_name(&dev->dev, "input%ld", |
1856 | (unsigned long) atomic_inc_return(&input_no) - 1); | |
bd0ef235 | 1857 | |
9657d75c | 1858 | error = device_add(&dev->dev); |
bd0ef235 DT |
1859 | if (error) |
1860 | return error; | |
1861 | ||
9657d75c | 1862 | path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
da0c4901 JP |
1863 | pr_info("%s as %s\n", |
1864 | dev->name ? dev->name : "Unspecified device", | |
1865 | path ? path : "N/A"); | |
bd0ef235 | 1866 | kfree(path); |
10204020 | 1867 | |
8006479c DT |
1868 | error = mutex_lock_interruptible(&input_mutex); |
1869 | if (error) { | |
1870 | device_del(&dev->dev); | |
1871 | return error; | |
1872 | } | |
1873 | ||
1874 | list_add_tail(&dev->node, &input_dev_list); | |
1875 | ||
1da177e4 | 1876 | list_for_each_entry(handler, &input_handler_list, node) |
5b2a0826 | 1877 | input_attach_handler(dev, handler); |
1da177e4 | 1878 | |
f96b434d | 1879 | input_wakeup_procfs_readers(); |
5f945489 | 1880 | |
8006479c DT |
1881 | mutex_unlock(&input_mutex); |
1882 | ||
5f945489 | 1883 | return 0; |
1da177e4 | 1884 | } |
ca56fe07 | 1885 | EXPORT_SYMBOL(input_register_device); |
1da177e4 | 1886 | |
8006479c DT |
1887 | /** |
1888 | * input_unregister_device - unregister previously registered device | |
1889 | * @dev: device to be unregistered | |
1890 | * | |
1891 | * This function unregisters an input device. Once device is unregistered | |
1892 | * the caller should not try to access it as it may get freed at any moment. | |
1893 | */ | |
1da177e4 LT |
1894 | void input_unregister_device(struct input_dev *dev) |
1895 | { | |
5b2a0826 | 1896 | struct input_handle *handle, *next; |
1da177e4 | 1897 | |
8006479c | 1898 | input_disconnect_device(dev); |
1da177e4 | 1899 | |
8006479c | 1900 | mutex_lock(&input_mutex); |
1da177e4 | 1901 | |
5b2a0826 | 1902 | list_for_each_entry_safe(handle, next, &dev->h_list, d_node) |
1da177e4 | 1903 | handle->handler->disconnect(handle); |
5b2a0826 | 1904 | WARN_ON(!list_empty(&dev->h_list)); |
1da177e4 | 1905 | |
8006479c | 1906 | del_timer_sync(&dev->timer); |
1da177e4 LT |
1907 | list_del_init(&dev->node); |
1908 | ||
f96b434d | 1909 | input_wakeup_procfs_readers(); |
8006479c DT |
1910 | |
1911 | mutex_unlock(&input_mutex); | |
1912 | ||
1913 | device_unregister(&dev->dev); | |
1da177e4 | 1914 | } |
ca56fe07 | 1915 | EXPORT_SYMBOL(input_unregister_device); |
1da177e4 | 1916 | |
8006479c DT |
1917 | /** |
1918 | * input_register_handler - register a new input handler | |
1919 | * @handler: handler to be registered | |
1920 | * | |
1921 | * This function registers a new input handler (interface) for input | |
1922 | * devices in the system and attaches it to all input devices that | |
1923 | * are compatible with the handler. | |
1924 | */ | |
4263cf0f | 1925 | int input_register_handler(struct input_handler *handler) |
1da177e4 LT |
1926 | { |
1927 | struct input_dev *dev; | |
8006479c DT |
1928 | int retval; |
1929 | ||
1930 | retval = mutex_lock_interruptible(&input_mutex); | |
1931 | if (retval) | |
1932 | return retval; | |
1da177e4 | 1933 | |
1da177e4 LT |
1934 | INIT_LIST_HEAD(&handler->h_list); |
1935 | ||
4263cf0f | 1936 | if (handler->fops != NULL) { |
8006479c DT |
1937 | if (input_table[handler->minor >> 5]) { |
1938 | retval = -EBUSY; | |
1939 | goto out; | |
1940 | } | |
1da177e4 | 1941 | input_table[handler->minor >> 5] = handler; |
4263cf0f | 1942 | } |
1da177e4 LT |
1943 | |
1944 | list_add_tail(&handler->node, &input_handler_list); | |
1945 | ||
1946 | list_for_each_entry(dev, &input_dev_list, node) | |
5b2a0826 | 1947 | input_attach_handler(dev, handler); |
1da177e4 | 1948 | |
f96b434d | 1949 | input_wakeup_procfs_readers(); |
8006479c DT |
1950 | |
1951 | out: | |
1952 | mutex_unlock(&input_mutex); | |
1953 | return retval; | |
1da177e4 | 1954 | } |
ca56fe07 | 1955 | EXPORT_SYMBOL(input_register_handler); |
1da177e4 | 1956 | |
8006479c DT |
1957 | /** |
1958 | * input_unregister_handler - unregisters an input handler | |
1959 | * @handler: handler to be unregistered | |
1960 | * | |
1961 | * This function disconnects a handler from its input devices and | |
1962 | * removes it from lists of known handlers. | |
1963 | */ | |
1da177e4 LT |
1964 | void input_unregister_handler(struct input_handler *handler) |
1965 | { | |
5b2a0826 | 1966 | struct input_handle *handle, *next; |
1da177e4 | 1967 | |
8006479c DT |
1968 | mutex_lock(&input_mutex); |
1969 | ||
5b2a0826 | 1970 | list_for_each_entry_safe(handle, next, &handler->h_list, h_node) |
1da177e4 | 1971 | handler->disconnect(handle); |
5b2a0826 | 1972 | WARN_ON(!list_empty(&handler->h_list)); |
1da177e4 LT |
1973 | |
1974 | list_del_init(&handler->node); | |
1975 | ||
1976 | if (handler->fops != NULL) | |
1977 | input_table[handler->minor >> 5] = NULL; | |
1978 | ||
f96b434d | 1979 | input_wakeup_procfs_readers(); |
8006479c DT |
1980 | |
1981 | mutex_unlock(&input_mutex); | |
1da177e4 | 1982 | } |
ca56fe07 | 1983 | EXPORT_SYMBOL(input_unregister_handler); |
1da177e4 | 1984 | |
66d2a595 DT |
1985 | /** |
1986 | * input_handler_for_each_handle - handle iterator | |
1987 | * @handler: input handler to iterate | |
1988 | * @data: data for the callback | |
1989 | * @fn: function to be called for each handle | |
1990 | * | |
1991 | * Iterate over @bus's list of devices, and call @fn for each, passing | |
1992 | * it @data and stop when @fn returns a non-zero value. The function is | |
1993 | * using RCU to traverse the list and therefore may be usind in atonic | |
1994 | * contexts. The @fn callback is invoked from RCU critical section and | |
1995 | * thus must not sleep. | |
1996 | */ | |
1997 | int input_handler_for_each_handle(struct input_handler *handler, void *data, | |
1998 | int (*fn)(struct input_handle *, void *)) | |
1999 | { | |
2000 | struct input_handle *handle; | |
2001 | int retval = 0; | |
2002 | ||
2003 | rcu_read_lock(); | |
2004 | ||
2005 | list_for_each_entry_rcu(handle, &handler->h_list, h_node) { | |
2006 | retval = fn(handle, data); | |
2007 | if (retval) | |
2008 | break; | |
2009 | } | |
2010 | ||
2011 | rcu_read_unlock(); | |
2012 | ||
2013 | return retval; | |
2014 | } | |
2015 | EXPORT_SYMBOL(input_handler_for_each_handle); | |
2016 | ||
8006479c DT |
2017 | /** |
2018 | * input_register_handle - register a new input handle | |
2019 | * @handle: handle to register | |
2020 | * | |
2021 | * This function puts a new input handle onto device's | |
2022 | * and handler's lists so that events can flow through | |
2023 | * it once it is opened using input_open_device(). | |
2024 | * | |
2025 | * This function is supposed to be called from handler's | |
2026 | * connect() method. | |
2027 | */ | |
5b2a0826 DT |
2028 | int input_register_handle(struct input_handle *handle) |
2029 | { | |
2030 | struct input_handler *handler = handle->handler; | |
8006479c DT |
2031 | struct input_dev *dev = handle->dev; |
2032 | int error; | |
2033 | ||
2034 | /* | |
2035 | * We take dev->mutex here to prevent race with | |
2036 | * input_release_device(). | |
2037 | */ | |
2038 | error = mutex_lock_interruptible(&dev->mutex); | |
2039 | if (error) | |
2040 | return error; | |
ef7995f4 DT |
2041 | |
2042 | /* | |
2043 | * Filters go to the head of the list, normal handlers | |
2044 | * to the tail. | |
2045 | */ | |
2046 | if (handler->filter) | |
2047 | list_add_rcu(&handle->d_node, &dev->h_list); | |
2048 | else | |
2049 | list_add_tail_rcu(&handle->d_node, &dev->h_list); | |
2050 | ||
8006479c | 2051 | mutex_unlock(&dev->mutex); |
5b2a0826 | 2052 | |
8006479c DT |
2053 | /* |
2054 | * Since we are supposed to be called from ->connect() | |
2055 | * which is mutually exclusive with ->disconnect() | |
2056 | * we can't be racing with input_unregister_handle() | |
2057 | * and so separate lock is not needed here. | |
2058 | */ | |
66d2a595 | 2059 | list_add_tail_rcu(&handle->h_node, &handler->h_list); |
5b2a0826 DT |
2060 | |
2061 | if (handler->start) | |
2062 | handler->start(handle); | |
2063 | ||
2064 | return 0; | |
2065 | } | |
2066 | EXPORT_SYMBOL(input_register_handle); | |
2067 | ||
8006479c DT |
2068 | /** |
2069 | * input_unregister_handle - unregister an input handle | |
2070 | * @handle: handle to unregister | |
2071 | * | |
2072 | * This function removes input handle from device's | |
2073 | * and handler's lists. | |
2074 | * | |
2075 | * This function is supposed to be called from handler's | |
2076 | * disconnect() method. | |
2077 | */ | |
5b2a0826 DT |
2078 | void input_unregister_handle(struct input_handle *handle) |
2079 | { | |
8006479c DT |
2080 | struct input_dev *dev = handle->dev; |
2081 | ||
66d2a595 | 2082 | list_del_rcu(&handle->h_node); |
8006479c DT |
2083 | |
2084 | /* | |
2085 | * Take dev->mutex to prevent race with input_release_device(). | |
2086 | */ | |
2087 | mutex_lock(&dev->mutex); | |
2088 | list_del_rcu(&handle->d_node); | |
2089 | mutex_unlock(&dev->mutex); | |
66d2a595 | 2090 | |
82ba56c2 | 2091 | synchronize_rcu(); |
5b2a0826 DT |
2092 | } |
2093 | EXPORT_SYMBOL(input_unregister_handle); | |
2094 | ||
1da177e4 LT |
2095 | static int input_open_file(struct inode *inode, struct file *file) |
2096 | { | |
2edbf853 | 2097 | struct input_handler *handler; |
99ac48f5 | 2098 | const struct file_operations *old_fops, *new_fops = NULL; |
1da177e4 LT |
2099 | int err; |
2100 | ||
2f2177c8 AB |
2101 | err = mutex_lock_interruptible(&input_mutex); |
2102 | if (err) | |
2103 | return err; | |
2104 | ||
1da177e4 | 2105 | /* No load-on-demand here? */ |
2edbf853 | 2106 | handler = input_table[iminor(inode) >> 5]; |
2f2177c8 AB |
2107 | if (handler) |
2108 | new_fops = fops_get(handler->fops); | |
2109 | ||
2110 | mutex_unlock(&input_mutex); | |
1da177e4 LT |
2111 | |
2112 | /* | |
2113 | * That's _really_ odd. Usually NULL ->open means "nothing special", | |
2114 | * not "no device". Oh, well... | |
2115 | */ | |
2f2177c8 | 2116 | if (!new_fops || !new_fops->open) { |
1da177e4 | 2117 | fops_put(new_fops); |
2edbf853 JC |
2118 | err = -ENODEV; |
2119 | goto out; | |
1da177e4 | 2120 | } |
2f2177c8 | 2121 | |
1da177e4 LT |
2122 | old_fops = file->f_op; |
2123 | file->f_op = new_fops; | |
2124 | ||
2125 | err = new_fops->open(inode, file); | |
1da177e4 LT |
2126 | if (err) { |
2127 | fops_put(file->f_op); | |
2128 | file->f_op = fops_get(old_fops); | |
2129 | } | |
2130 | fops_put(old_fops); | |
2edbf853 | 2131 | out: |
1da177e4 LT |
2132 | return err; |
2133 | } | |
2134 | ||
2b8693c0 | 2135 | static const struct file_operations input_fops = { |
1da177e4 LT |
2136 | .owner = THIS_MODULE, |
2137 | .open = input_open_file, | |
6038f373 | 2138 | .llseek = noop_llseek, |
1da177e4 LT |
2139 | }; |
2140 | ||
f96b434d | 2141 | static int __init input_init(void) |
1da177e4 | 2142 | { |
f96b434d | 2143 | int err; |
1da177e4 | 2144 | |
ea9f240b | 2145 | err = class_register(&input_class); |
d19fbe8a | 2146 | if (err) { |
da0c4901 | 2147 | pr_err("unable to register input_dev class\n"); |
d19fbe8a DT |
2148 | return err; |
2149 | } | |
2150 | ||
f96b434d DT |
2151 | err = input_proc_init(); |
2152 | if (err) | |
b0fdfebb | 2153 | goto fail1; |
1da177e4 | 2154 | |
f96b434d DT |
2155 | err = register_chrdev(INPUT_MAJOR, "input", &input_fops); |
2156 | if (err) { | |
da0c4901 | 2157 | pr_err("unable to register char major %d", INPUT_MAJOR); |
b0fdfebb | 2158 | goto fail2; |
1da177e4 | 2159 | } |
e334016f | 2160 | |
1da177e4 | 2161 | return 0; |
1da177e4 | 2162 | |
b0fdfebb | 2163 | fail2: input_proc_exit(); |
ea9f240b | 2164 | fail1: class_unregister(&input_class); |
f96b434d | 2165 | return err; |
1da177e4 LT |
2166 | } |
2167 | ||
2168 | static void __exit input_exit(void) | |
2169 | { | |
f96b434d | 2170 | input_proc_exit(); |
1da177e4 | 2171 | unregister_chrdev(INPUT_MAJOR, "input"); |
ea9f240b | 2172 | class_unregister(&input_class); |
1da177e4 LT |
2173 | } |
2174 | ||
2175 | subsys_initcall(input_init); | |
2176 | module_exit(input_exit); |