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, | |
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 | { | |
8d18fba2 | 169 | struct input_mt *mt = dev->mt; |
40d007e7 HR |
170 | bool is_mt_event; |
171 | int *pold; | |
172 | ||
173 | if (code == ABS_MT_SLOT) { | |
174 | /* | |
175 | * "Stage" the event; we'll flush it later, when we | |
144c0f88 | 176 | * get actual touch data. |
40d007e7 | 177 | */ |
8d18fba2 HR |
178 | if (mt && *pval >= 0 && *pval < mt->num_slots) |
179 | mt->slot = *pval; | |
40d007e7 HR |
180 | |
181 | return INPUT_IGNORE_EVENT; | |
182 | } | |
183 | ||
b89529a1 | 184 | is_mt_event = input_is_mt_value(code); |
40d007e7 HR |
185 | |
186 | if (!is_mt_event) { | |
d31b2865 | 187 | pold = &dev->absinfo[code].value; |
8d18fba2 HR |
188 | } else if (mt) { |
189 | pold = &mt->slots[mt->slot].abs[code - ABS_MT_FIRST]; | |
40d007e7 HR |
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 */ | |
8d18fba2 HR |
208 | if (is_mt_event && mt && mt->slot != input_abs_get_val(dev, ABS_MT_SLOT)) { |
209 | input_abs_set_val(dev, ABS_MT_SLOT, mt->slot); | |
210 | input_pass_event(dev, EV_ABS, ABS_MT_SLOT, mt->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 | 242 | case EV_KEY: |
0672120a HR |
243 | if (is_event_supported(code, dev->keybit, KEY_MAX)) { |
244 | ||
245 | /* auto-repeat bypasses state updates */ | |
246 | if (value == 2) { | |
247 | disposition = INPUT_PASS_TO_HANDLERS; | |
248 | break; | |
249 | } | |
250 | ||
251 | if (!!test_bit(code, dev->key) != !!value) { | |
1da177e4 | 252 | |
8006479c | 253 | __change_bit(code, dev->key); |
0672120a HR |
254 | disposition = INPUT_PASS_TO_HANDLERS; |
255 | ||
8006479c DT |
256 | if (value) |
257 | input_start_autorepeat(dev, code); | |
e7b5c1ef JB |
258 | else |
259 | input_stop_autorepeat(dev); | |
8006479c | 260 | } |
8006479c DT |
261 | } |
262 | break; | |
1da177e4 | 263 | |
8006479c DT |
264 | case EV_SW: |
265 | if (is_event_supported(code, dev->swbit, SW_MAX) && | |
0672120a | 266 | !!test_bit(code, dev->sw) != !!value) { |
1da177e4 | 267 | |
8006479c DT |
268 | __change_bit(code, dev->sw); |
269 | disposition = INPUT_PASS_TO_HANDLERS; | |
270 | } | |
271 | break; | |
1da177e4 | 272 | |
8006479c | 273 | case EV_ABS: |
40d007e7 | 274 | if (is_event_supported(code, dev->absbit, ABS_MAX)) |
9ae4345a | 275 | disposition = input_handle_abs_event(dev, code, &value); |
61994a61 | 276 | |
8006479c | 277 | break; |
1da177e4 | 278 | |
8006479c DT |
279 | case EV_REL: |
280 | if (is_event_supported(code, dev->relbit, REL_MAX) && value) | |
281 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 282 | |
8006479c | 283 | break; |
1e0afb28 | 284 | |
8006479c DT |
285 | case EV_MSC: |
286 | if (is_event_supported(code, dev->mscbit, MSC_MAX)) | |
287 | disposition = INPUT_PASS_TO_ALL; | |
1da177e4 | 288 | |
8006479c | 289 | break; |
1da177e4 | 290 | |
8006479c DT |
291 | case EV_LED: |
292 | if (is_event_supported(code, dev->ledbit, LED_MAX) && | |
0672120a | 293 | !!test_bit(code, dev->led) != !!value) { |
1da177e4 | 294 | |
8006479c DT |
295 | __change_bit(code, dev->led); |
296 | disposition = INPUT_PASS_TO_ALL; | |
297 | } | |
298 | break; | |
299 | ||
300 | case EV_SND: | |
301 | if (is_event_supported(code, dev->sndbit, SND_MAX)) { | |
1da177e4 | 302 | |
8fdc1948 | 303 | if (!!test_bit(code, dev->snd) != !!value) |
8006479c DT |
304 | __change_bit(code, dev->snd); |
305 | disposition = INPUT_PASS_TO_ALL; | |
306 | } | |
307 | break; | |
8fdc1948 | 308 | |
8006479c DT |
309 | case EV_REP: |
310 | if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) { | |
311 | dev->rep[code] = value; | |
312 | disposition = INPUT_PASS_TO_ALL; | |
313 | } | |
314 | break; | |
1da177e4 | 315 | |
8006479c DT |
316 | case EV_FF: |
317 | if (value >= 0) | |
318 | disposition = INPUT_PASS_TO_ALL; | |
319 | break; | |
ed2fa4dd RP |
320 | |
321 | case EV_PWR: | |
322 | disposition = INPUT_PASS_TO_ALL; | |
323 | break; | |
8006479c | 324 | } |
1da177e4 | 325 | |
c9812282 | 326 | if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN) |
20da92de | 327 | dev->sync = false; |
1da177e4 | 328 | |
8006479c DT |
329 | if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event) |
330 | dev->event(dev, type, code, value); | |
1da177e4 | 331 | |
8006479c | 332 | if (disposition & INPUT_PASS_TO_HANDLERS) |
9ae4345a | 333 | input_pass_event(dev, type, code, value); |
8006479c | 334 | } |
1da177e4 | 335 | |
8006479c DT |
336 | /** |
337 | * input_event() - report new input event | |
338 | * @dev: device that generated the event | |
339 | * @type: type of the event | |
340 | * @code: event code | |
341 | * @value: value of the event | |
342 | * | |
343 | * This function should be used by drivers implementing various input | |
df2d4637 DT |
344 | * devices to report input events. See also input_inject_event(). |
345 | * | |
346 | * NOTE: input_event() may be safely used right after input device was | |
347 | * allocated with input_allocate_device(), even before it is registered | |
348 | * with input_register_device(), but the event will not reach any of the | |
349 | * input handlers. Such early invocation of input_event() may be used | |
350 | * to 'seed' initial state of a switch or initial position of absolute | |
351 | * axis, etc. | |
8006479c | 352 | */ |
8006479c DT |
353 | void input_event(struct input_dev *dev, |
354 | unsigned int type, unsigned int code, int value) | |
355 | { | |
356 | unsigned long flags; | |
509ca1a9 | 357 | |
8006479c | 358 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
509ca1a9 | 359 | |
8006479c DT |
360 | spin_lock_irqsave(&dev->event_lock, flags); |
361 | add_input_randomness(type, code, value); | |
9ae4345a | 362 | input_handle_event(dev, type, code, value); |
8006479c | 363 | spin_unlock_irqrestore(&dev->event_lock, flags); |
1da177e4 | 364 | } |
1da177e4 | 365 | } |
ca56fe07 | 366 | EXPORT_SYMBOL(input_event); |
1da177e4 | 367 | |
0e739d28 DT |
368 | /** |
369 | * input_inject_event() - send input event from input handler | |
370 | * @handle: input handle to send event through | |
371 | * @type: type of the event | |
372 | * @code: event code | |
373 | * @value: value of the event | |
374 | * | |
8006479c DT |
375 | * Similar to input_event() but will ignore event if device is |
376 | * "grabbed" and handle injecting event is not the one that owns | |
377 | * the device. | |
0e739d28 | 378 | */ |
8006479c DT |
379 | void input_inject_event(struct input_handle *handle, |
380 | unsigned int type, unsigned int code, int value) | |
1da177e4 | 381 | { |
8006479c DT |
382 | struct input_dev *dev = handle->dev; |
383 | struct input_handle *grab; | |
384 | unsigned long flags; | |
1da177e4 | 385 | |
8006479c DT |
386 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
387 | spin_lock_irqsave(&dev->event_lock, flags); | |
1da177e4 | 388 | |
82ba56c2 | 389 | rcu_read_lock(); |
8006479c DT |
390 | grab = rcu_dereference(dev->grab); |
391 | if (!grab || grab == handle) | |
9ae4345a | 392 | input_handle_event(dev, type, code, value); |
82ba56c2 | 393 | rcu_read_unlock(); |
1da177e4 | 394 | |
8006479c DT |
395 | spin_unlock_irqrestore(&dev->event_lock, flags); |
396 | } | |
1da177e4 | 397 | } |
8006479c | 398 | EXPORT_SYMBOL(input_inject_event); |
1da177e4 | 399 | |
d31b2865 DM |
400 | /** |
401 | * input_alloc_absinfo - allocates array of input_absinfo structs | |
402 | * @dev: the input device emitting absolute events | |
403 | * | |
404 | * If the absinfo struct the caller asked for is already allocated, this | |
405 | * functions will not do anything. | |
406 | */ | |
407 | void input_alloc_absinfo(struct input_dev *dev) | |
408 | { | |
409 | if (!dev->absinfo) | |
410 | dev->absinfo = kcalloc(ABS_CNT, sizeof(struct input_absinfo), | |
411 | GFP_KERNEL); | |
412 | ||
413 | WARN(!dev->absinfo, "%s(): kcalloc() failed?\n", __func__); | |
414 | } | |
415 | EXPORT_SYMBOL(input_alloc_absinfo); | |
416 | ||
417 | void input_set_abs_params(struct input_dev *dev, unsigned int axis, | |
418 | int min, int max, int fuzz, int flat) | |
419 | { | |
420 | struct input_absinfo *absinfo; | |
421 | ||
422 | input_alloc_absinfo(dev); | |
423 | if (!dev->absinfo) | |
424 | return; | |
425 | ||
426 | absinfo = &dev->absinfo[axis]; | |
427 | absinfo->minimum = min; | |
428 | absinfo->maximum = max; | |
429 | absinfo->fuzz = fuzz; | |
430 | absinfo->flat = flat; | |
431 | ||
432 | dev->absbit[BIT_WORD(axis)] |= BIT_MASK(axis); | |
433 | } | |
434 | EXPORT_SYMBOL(input_set_abs_params); | |
435 | ||
436 | ||
8006479c DT |
437 | /** |
438 | * input_grab_device - grabs device for exclusive use | |
439 | * @handle: input handle that wants to own the device | |
440 | * | |
441 | * When a device is grabbed by an input handle all events generated by | |
442 | * the device are delivered only to this handle. Also events injected | |
443 | * by other input handles are ignored while device is grabbed. | |
444 | */ | |
1da177e4 LT |
445 | int input_grab_device(struct input_handle *handle) |
446 | { | |
8006479c DT |
447 | struct input_dev *dev = handle->dev; |
448 | int retval; | |
1da177e4 | 449 | |
8006479c DT |
450 | retval = mutex_lock_interruptible(&dev->mutex); |
451 | if (retval) | |
452 | return retval; | |
453 | ||
454 | if (dev->grab) { | |
455 | retval = -EBUSY; | |
456 | goto out; | |
457 | } | |
458 | ||
459 | rcu_assign_pointer(dev->grab, handle); | |
8006479c DT |
460 | |
461 | out: | |
462 | mutex_unlock(&dev->mutex); | |
463 | return retval; | |
1da177e4 | 464 | } |
ca56fe07 | 465 | EXPORT_SYMBOL(input_grab_device); |
1da177e4 | 466 | |
8006479c | 467 | static void __input_release_device(struct input_handle *handle) |
1da177e4 | 468 | { |
a2b2ed2c | 469 | struct input_dev *dev = handle->dev; |
c7e8dc6e | 470 | |
a2b2ed2c | 471 | if (dev->grab == handle) { |
8006479c DT |
472 | rcu_assign_pointer(dev->grab, NULL); |
473 | /* Make sure input_pass_event() notices that grab is gone */ | |
82ba56c2 | 474 | synchronize_rcu(); |
a2b2ed2c AM |
475 | |
476 | list_for_each_entry(handle, &dev->h_list, d_node) | |
8006479c | 477 | if (handle->open && handle->handler->start) |
c7e8dc6e DT |
478 | handle->handler->start(handle); |
479 | } | |
1da177e4 | 480 | } |
8006479c DT |
481 | |
482 | /** | |
483 | * input_release_device - release previously grabbed device | |
484 | * @handle: input handle that owns the device | |
485 | * | |
486 | * Releases previously grabbed device so that other input handles can | |
487 | * start receiving input events. Upon release all handlers attached | |
488 | * to the device have their start() method called so they have a change | |
489 | * to synchronize device state with the rest of the system. | |
490 | */ | |
491 | void input_release_device(struct input_handle *handle) | |
492 | { | |
493 | struct input_dev *dev = handle->dev; | |
494 | ||
495 | mutex_lock(&dev->mutex); | |
496 | __input_release_device(handle); | |
497 | mutex_unlock(&dev->mutex); | |
498 | } | |
ca56fe07 | 499 | EXPORT_SYMBOL(input_release_device); |
1da177e4 | 500 | |
8006479c DT |
501 | /** |
502 | * input_open_device - open input device | |
503 | * @handle: handle through which device is being accessed | |
504 | * | |
505 | * This function should be called by input handlers when they | |
506 | * want to start receive events from given input device. | |
507 | */ | |
1da177e4 LT |
508 | int input_open_device(struct input_handle *handle) |
509 | { | |
0fbf87ca | 510 | struct input_dev *dev = handle->dev; |
8006479c | 511 | int retval; |
0fbf87ca | 512 | |
8006479c DT |
513 | retval = mutex_lock_interruptible(&dev->mutex); |
514 | if (retval) | |
515 | return retval; | |
516 | ||
517 | if (dev->going_away) { | |
518 | retval = -ENODEV; | |
519 | goto out; | |
520 | } | |
0fbf87ca | 521 | |
1da177e4 | 522 | handle->open++; |
0fbf87ca DT |
523 | |
524 | if (!dev->users++ && dev->open) | |
8006479c DT |
525 | retval = dev->open(dev); |
526 | ||
527 | if (retval) { | |
528 | dev->users--; | |
529 | if (!--handle->open) { | |
530 | /* | |
531 | * Make sure we are not delivering any more events | |
532 | * through this handle | |
533 | */ | |
82ba56c2 | 534 | synchronize_rcu(); |
8006479c DT |
535 | } |
536 | } | |
0fbf87ca | 537 | |
8006479c | 538 | out: |
e676c232 | 539 | mutex_unlock(&dev->mutex); |
8006479c | 540 | return retval; |
1da177e4 | 541 | } |
ca56fe07 | 542 | EXPORT_SYMBOL(input_open_device); |
1da177e4 | 543 | |
8006479c | 544 | int input_flush_device(struct input_handle *handle, struct file *file) |
1da177e4 | 545 | { |
8006479c DT |
546 | struct input_dev *dev = handle->dev; |
547 | int retval; | |
1da177e4 | 548 | |
8006479c DT |
549 | retval = mutex_lock_interruptible(&dev->mutex); |
550 | if (retval) | |
551 | return retval; | |
552 | ||
553 | if (dev->flush) | |
554 | retval = dev->flush(dev, file); | |
555 | ||
556 | mutex_unlock(&dev->mutex); | |
557 | return retval; | |
1da177e4 | 558 | } |
ca56fe07 | 559 | EXPORT_SYMBOL(input_flush_device); |
1da177e4 | 560 | |
8006479c DT |
561 | /** |
562 | * input_close_device - close input device | |
563 | * @handle: handle through which device is being accessed | |
564 | * | |
565 | * This function should be called by input handlers when they | |
566 | * want to stop receive events from given input device. | |
567 | */ | |
1da177e4 LT |
568 | void input_close_device(struct input_handle *handle) |
569 | { | |
0fbf87ca DT |
570 | struct input_dev *dev = handle->dev; |
571 | ||
e676c232 | 572 | mutex_lock(&dev->mutex); |
0fbf87ca | 573 | |
8006479c DT |
574 | __input_release_device(handle); |
575 | ||
0fbf87ca DT |
576 | if (!--dev->users && dev->close) |
577 | dev->close(dev); | |
8006479c DT |
578 | |
579 | if (!--handle->open) { | |
580 | /* | |
82ba56c2 | 581 | * synchronize_rcu() makes sure that input_pass_event() |
8006479c DT |
582 | * completed and that no more input events are delivered |
583 | * through this handle | |
584 | */ | |
82ba56c2 | 585 | synchronize_rcu(); |
8006479c | 586 | } |
0fbf87ca | 587 | |
e676c232 | 588 | mutex_unlock(&dev->mutex); |
1da177e4 | 589 | } |
ca56fe07 | 590 | EXPORT_SYMBOL(input_close_device); |
1da177e4 | 591 | |
866d7d7b ON |
592 | /* |
593 | * Simulate keyup events for all keys that are marked as pressed. | |
594 | * The function must be called with dev->event_lock held. | |
595 | */ | |
596 | static void input_dev_release_keys(struct input_dev *dev) | |
597 | { | |
598 | int code; | |
599 | ||
600 | if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) { | |
601 | for (code = 0; code <= KEY_MAX; code++) { | |
602 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
603 | __test_and_clear_bit(code, dev->key)) { | |
9ae4345a | 604 | input_pass_event(dev, EV_KEY, code, 0); |
866d7d7b ON |
605 | } |
606 | } | |
9ae4345a | 607 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); |
866d7d7b ON |
608 | } |
609 | } | |
610 | ||
8006479c DT |
611 | /* |
612 | * Prepare device for unregistering | |
613 | */ | |
614 | static void input_disconnect_device(struct input_dev *dev) | |
615 | { | |
616 | struct input_handle *handle; | |
8006479c DT |
617 | |
618 | /* | |
619 | * Mark device as going away. Note that we take dev->mutex here | |
620 | * not to protect access to dev->going_away but rather to ensure | |
621 | * that there are no threads in the middle of input_open_device() | |
622 | */ | |
623 | mutex_lock(&dev->mutex); | |
ffd0db97 | 624 | dev->going_away = true; |
8006479c DT |
625 | mutex_unlock(&dev->mutex); |
626 | ||
627 | spin_lock_irq(&dev->event_lock); | |
628 | ||
629 | /* | |
630 | * Simulate keyup events for all pressed keys so that handlers | |
631 | * are not left with "stuck" keys. The driver may continue | |
632 | * generate events even after we done here but they will not | |
633 | * reach any handlers. | |
634 | */ | |
866d7d7b | 635 | input_dev_release_keys(dev); |
8006479c DT |
636 | |
637 | list_for_each_entry(handle, &dev->h_list, d_node) | |
638 | handle->open = 0; | |
639 | ||
640 | spin_unlock_irq(&dev->event_lock); | |
641 | } | |
642 | ||
8613e4c2 MCC |
643 | /** |
644 | * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry | |
645 | * @ke: keymap entry containing scancode to be converted. | |
646 | * @scancode: pointer to the location where converted scancode should | |
647 | * be stored. | |
648 | * | |
649 | * This function is used to convert scancode stored in &struct keymap_entry | |
650 | * into scalar form understood by legacy keymap handling methods. These | |
651 | * methods expect scancodes to be represented as 'unsigned int'. | |
652 | */ | |
653 | int input_scancode_to_scalar(const struct input_keymap_entry *ke, | |
654 | unsigned int *scancode) | |
655 | { | |
656 | switch (ke->len) { | |
657 | case 1: | |
658 | *scancode = *((u8 *)ke->scancode); | |
659 | break; | |
660 | ||
661 | case 2: | |
662 | *scancode = *((u16 *)ke->scancode); | |
663 | break; | |
664 | ||
665 | case 4: | |
666 | *scancode = *((u32 *)ke->scancode); | |
667 | break; | |
668 | ||
669 | default: | |
670 | return -EINVAL; | |
671 | } | |
672 | ||
673 | return 0; | |
674 | } | |
675 | EXPORT_SYMBOL(input_scancode_to_scalar); | |
676 | ||
677 | /* | |
678 | * Those routines handle the default case where no [gs]etkeycode() is | |
679 | * defined. In this case, an array indexed by the scancode is used. | |
680 | */ | |
681 | ||
682 | static unsigned int input_fetch_keycode(struct input_dev *dev, | |
683 | unsigned int index) | |
c8e4c772 MR |
684 | { |
685 | switch (dev->keycodesize) { | |
8613e4c2 MCC |
686 | case 1: |
687 | return ((u8 *)dev->keycode)[index]; | |
c8e4c772 | 688 | |
8613e4c2 MCC |
689 | case 2: |
690 | return ((u16 *)dev->keycode)[index]; | |
c8e4c772 | 691 | |
8613e4c2 MCC |
692 | default: |
693 | return ((u32 *)dev->keycode)[index]; | |
c8e4c772 MR |
694 | } |
695 | } | |
696 | ||
697 | static int input_default_getkeycode(struct input_dev *dev, | |
8613e4c2 | 698 | struct input_keymap_entry *ke) |
c8e4c772 | 699 | { |
8613e4c2 MCC |
700 | unsigned int index; |
701 | int error; | |
702 | ||
c8e4c772 MR |
703 | if (!dev->keycodesize) |
704 | return -EINVAL; | |
705 | ||
8613e4c2 MCC |
706 | if (ke->flags & INPUT_KEYMAP_BY_INDEX) |
707 | index = ke->index; | |
708 | else { | |
709 | error = input_scancode_to_scalar(ke, &index); | |
710 | if (error) | |
711 | return error; | |
712 | } | |
713 | ||
714 | if (index >= dev->keycodemax) | |
c8e4c772 MR |
715 | return -EINVAL; |
716 | ||
8613e4c2 MCC |
717 | ke->keycode = input_fetch_keycode(dev, index); |
718 | ke->index = index; | |
719 | ke->len = sizeof(index); | |
720 | memcpy(ke->scancode, &index, sizeof(index)); | |
c8e4c772 MR |
721 | |
722 | return 0; | |
723 | } | |
724 | ||
725 | static int input_default_setkeycode(struct input_dev *dev, | |
8613e4c2 MCC |
726 | const struct input_keymap_entry *ke, |
727 | unsigned int *old_keycode) | |
c8e4c772 | 728 | { |
8613e4c2 MCC |
729 | unsigned int index; |
730 | int error; | |
c8e4c772 MR |
731 | int i; |
732 | ||
8613e4c2 | 733 | if (!dev->keycodesize) |
c8e4c772 MR |
734 | return -EINVAL; |
735 | ||
8613e4c2 MCC |
736 | if (ke->flags & INPUT_KEYMAP_BY_INDEX) { |
737 | index = ke->index; | |
738 | } else { | |
739 | error = input_scancode_to_scalar(ke, &index); | |
740 | if (error) | |
741 | return error; | |
742 | } | |
743 | ||
744 | if (index >= dev->keycodemax) | |
c8e4c772 MR |
745 | return -EINVAL; |
746 | ||
de391d12 | 747 | if (dev->keycodesize < sizeof(ke->keycode) && |
8613e4c2 | 748 | (ke->keycode >> (dev->keycodesize * 8))) |
c8e4c772 MR |
749 | return -EINVAL; |
750 | ||
751 | switch (dev->keycodesize) { | |
752 | case 1: { | |
753 | u8 *k = (u8 *)dev->keycode; | |
8613e4c2 MCC |
754 | *old_keycode = k[index]; |
755 | k[index] = ke->keycode; | |
c8e4c772 MR |
756 | break; |
757 | } | |
758 | case 2: { | |
759 | u16 *k = (u16 *)dev->keycode; | |
8613e4c2 MCC |
760 | *old_keycode = k[index]; |
761 | k[index] = ke->keycode; | |
c8e4c772 MR |
762 | break; |
763 | } | |
764 | default: { | |
765 | u32 *k = (u32 *)dev->keycode; | |
8613e4c2 MCC |
766 | *old_keycode = k[index]; |
767 | k[index] = ke->keycode; | |
c8e4c772 MR |
768 | break; |
769 | } | |
770 | } | |
771 | ||
8613e4c2 MCC |
772 | __clear_bit(*old_keycode, dev->keybit); |
773 | __set_bit(ke->keycode, dev->keybit); | |
c8e4c772 MR |
774 | |
775 | for (i = 0; i < dev->keycodemax; i++) { | |
8613e4c2 MCC |
776 | if (input_fetch_keycode(dev, i) == *old_keycode) { |
777 | __set_bit(*old_keycode, dev->keybit); | |
c8e4c772 MR |
778 | break; /* Setting the bit twice is useless, so break */ |
779 | } | |
780 | } | |
781 | ||
782 | return 0; | |
783 | } | |
784 | ||
f4f37c8e DT |
785 | /** |
786 | * input_get_keycode - retrieve keycode currently mapped to a given scancode | |
787 | * @dev: input device which keymap is being queried | |
8613e4c2 | 788 | * @ke: keymap entry |
f4f37c8e DT |
789 | * |
790 | * This function should be called by anyone interested in retrieving current | |
8613e4c2 | 791 | * keymap. Presently evdev handlers use it. |
f4f37c8e | 792 | */ |
8613e4c2 | 793 | int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke) |
f4f37c8e | 794 | { |
2e2e3b96 DT |
795 | unsigned long flags; |
796 | int retval; | |
797 | ||
798 | spin_lock_irqsave(&dev->event_lock, flags); | |
aebd636b | 799 | retval = dev->getkeycode(dev, ke); |
8613e4c2 | 800 | spin_unlock_irqrestore(&dev->event_lock, flags); |
aebd636b | 801 | |
2e2e3b96 | 802 | return retval; |
f4f37c8e DT |
803 | } |
804 | EXPORT_SYMBOL(input_get_keycode); | |
805 | ||
806 | /** | |
8613e4c2 | 807 | * input_set_keycode - attribute a keycode to a given scancode |
f4f37c8e | 808 | * @dev: input device which keymap is being updated |
8613e4c2 | 809 | * @ke: new keymap entry |
f4f37c8e DT |
810 | * |
811 | * This function should be called by anyone needing to update current | |
812 | * keymap. Presently keyboard and evdev handlers use it. | |
813 | */ | |
58b93995 | 814 | int input_set_keycode(struct input_dev *dev, |
8613e4c2 | 815 | const struct input_keymap_entry *ke) |
f4f37c8e DT |
816 | { |
817 | unsigned long flags; | |
fd6cf3dd | 818 | unsigned int old_keycode; |
f4f37c8e DT |
819 | int retval; |
820 | ||
8613e4c2 | 821 | if (ke->keycode > KEY_MAX) |
f4f37c8e DT |
822 | return -EINVAL; |
823 | ||
824 | spin_lock_irqsave(&dev->event_lock, flags); | |
825 | ||
aebd636b | 826 | retval = dev->setkeycode(dev, ke, &old_keycode); |
f4f37c8e DT |
827 | if (retval) |
828 | goto out; | |
829 | ||
4f93df40 DT |
830 | /* Make sure KEY_RESERVED did not get enabled. */ |
831 | __clear_bit(KEY_RESERVED, dev->keybit); | |
832 | ||
f4f37c8e DT |
833 | /* |
834 | * Simulate keyup event if keycode is not present | |
835 | * in the keymap anymore | |
836 | */ | |
837 | if (test_bit(EV_KEY, dev->evbit) && | |
838 | !is_event_supported(old_keycode, dev->keybit, KEY_MAX) && | |
839 | __test_and_clear_bit(old_keycode, dev->key)) { | |
840 | ||
9ae4345a | 841 | input_pass_event(dev, EV_KEY, old_keycode, 0); |
f4f37c8e | 842 | if (dev->sync) |
9ae4345a | 843 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); |
f4f37c8e DT |
844 | } |
845 | ||
846 | out: | |
847 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
848 | ||
849 | return retval; | |
850 | } | |
851 | EXPORT_SYMBOL(input_set_keycode); | |
c8e4c772 | 852 | |
1da177e4 | 853 | #define MATCH_BIT(bit, max) \ |
7b19ada2 | 854 | for (i = 0; i < BITS_TO_LONGS(max); i++) \ |
1da177e4 LT |
855 | if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \ |
856 | break; \ | |
7b19ada2 | 857 | if (i != BITS_TO_LONGS(max)) \ |
1da177e4 LT |
858 | continue; |
859 | ||
0b7024ac | 860 | static const struct input_device_id *input_match_device(struct input_handler *handler, |
66e66118 | 861 | struct input_dev *dev) |
1da177e4 | 862 | { |
0b7024ac | 863 | const struct input_device_id *id; |
1da177e4 LT |
864 | int i; |
865 | ||
0b7024ac | 866 | for (id = handler->id_table; id->flags || id->driver_info; id++) { |
1da177e4 LT |
867 | |
868 | if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) | |
ddc5d341 | 869 | if (id->bustype != dev->id.bustype) |
1da177e4 LT |
870 | continue; |
871 | ||
872 | if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) | |
ddc5d341 | 873 | if (id->vendor != dev->id.vendor) |
1da177e4 LT |
874 | continue; |
875 | ||
876 | if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) | |
ddc5d341 | 877 | if (id->product != dev->id.product) |
1da177e4 LT |
878 | continue; |
879 | ||
880 | if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) | |
ddc5d341 | 881 | if (id->version != dev->id.version) |
1da177e4 LT |
882 | continue; |
883 | ||
884 | MATCH_BIT(evbit, EV_MAX); | |
885 | MATCH_BIT(keybit, KEY_MAX); | |
886 | MATCH_BIT(relbit, REL_MAX); | |
887 | MATCH_BIT(absbit, ABS_MAX); | |
888 | MATCH_BIT(mscbit, MSC_MAX); | |
889 | MATCH_BIT(ledbit, LED_MAX); | |
890 | MATCH_BIT(sndbit, SND_MAX); | |
891 | MATCH_BIT(ffbit, FF_MAX); | |
ff13f98b | 892 | MATCH_BIT(swbit, SW_MAX); |
1da177e4 | 893 | |
0b7024ac DT |
894 | if (!handler->match || handler->match(handler, dev)) |
895 | return id; | |
1da177e4 LT |
896 | } |
897 | ||
898 | return NULL; | |
899 | } | |
900 | ||
5b2a0826 DT |
901 | static int input_attach_handler(struct input_dev *dev, struct input_handler *handler) |
902 | { | |
903 | const struct input_device_id *id; | |
904 | int error; | |
905 | ||
0b7024ac | 906 | id = input_match_device(handler, dev); |
5b2a0826 DT |
907 | if (!id) |
908 | return -ENODEV; | |
909 | ||
910 | error = handler->connect(handler, dev, id); | |
911 | if (error && error != -ENODEV) | |
da0c4901 JP |
912 | pr_err("failed to attach handler %s to device %s, error: %d\n", |
913 | handler->name, kobject_name(&dev->dev.kobj), error); | |
5b2a0826 DT |
914 | |
915 | return error; | |
916 | } | |
917 | ||
15e184af DT |
918 | #ifdef CONFIG_COMPAT |
919 | ||
920 | static int input_bits_to_string(char *buf, int buf_size, | |
921 | unsigned long bits, bool skip_empty) | |
922 | { | |
923 | int len = 0; | |
924 | ||
925 | if (INPUT_COMPAT_TEST) { | |
926 | u32 dword = bits >> 32; | |
927 | if (dword || !skip_empty) | |
928 | len += snprintf(buf, buf_size, "%x ", dword); | |
929 | ||
930 | dword = bits & 0xffffffffUL; | |
931 | if (dword || !skip_empty || len) | |
932 | len += snprintf(buf + len, max(buf_size - len, 0), | |
933 | "%x", dword); | |
934 | } else { | |
935 | if (bits || !skip_empty) | |
936 | len += snprintf(buf, buf_size, "%lx", bits); | |
937 | } | |
938 | ||
939 | return len; | |
940 | } | |
941 | ||
942 | #else /* !CONFIG_COMPAT */ | |
943 | ||
944 | static int input_bits_to_string(char *buf, int buf_size, | |
945 | unsigned long bits, bool skip_empty) | |
946 | { | |
947 | return bits || !skip_empty ? | |
948 | snprintf(buf, buf_size, "%lx", bits) : 0; | |
949 | } | |
950 | ||
951 | #endif | |
5b2a0826 | 952 | |
f96b434d DT |
953 | #ifdef CONFIG_PROC_FS |
954 | ||
955 | static struct proc_dir_entry *proc_bus_input_dir; | |
956 | static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); | |
957 | static int input_devices_state; | |
958 | ||
959 | static inline void input_wakeup_procfs_readers(void) | |
960 | { | |
961 | input_devices_state++; | |
962 | wake_up(&input_devices_poll_wait); | |
963 | } | |
964 | ||
969b21cd | 965 | static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait) |
f96b434d | 966 | { |
f96b434d | 967 | poll_wait(file, &input_devices_poll_wait, wait); |
fa886612 DT |
968 | if (file->f_version != input_devices_state) { |
969 | file->f_version = input_devices_state; | |
f96b434d | 970 | return POLLIN | POLLRDNORM; |
fa886612 | 971 | } |
1e0afb28 | 972 | |
f96b434d DT |
973 | return 0; |
974 | } | |
975 | ||
1572ca2a DT |
976 | union input_seq_state { |
977 | struct { | |
978 | unsigned short pos; | |
979 | bool mutex_acquired; | |
980 | }; | |
981 | void *p; | |
982 | }; | |
983 | ||
969b21cd DT |
984 | static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) |
985 | { | |
1572ca2a DT |
986 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
987 | int error; | |
988 | ||
989 | /* We need to fit into seq->private pointer */ | |
990 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
991 | ||
992 | error = mutex_lock_interruptible(&input_mutex); | |
993 | if (error) { | |
994 | state->mutex_acquired = false; | |
995 | return ERR_PTR(error); | |
996 | } | |
997 | ||
998 | state->mutex_acquired = true; | |
f96b434d | 999 | |
ad5d972c | 1000 | return seq_list_start(&input_dev_list, *pos); |
969b21cd | 1001 | } |
051b2fea | 1002 | |
969b21cd DT |
1003 | static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1004 | { | |
ad5d972c | 1005 | return seq_list_next(v, &input_dev_list, pos); |
969b21cd | 1006 | } |
f96b434d | 1007 | |
1572ca2a | 1008 | static void input_seq_stop(struct seq_file *seq, void *v) |
969b21cd | 1009 | { |
1572ca2a DT |
1010 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1011 | ||
1012 | if (state->mutex_acquired) | |
1013 | mutex_unlock(&input_mutex); | |
969b21cd | 1014 | } |
f96b434d | 1015 | |
969b21cd DT |
1016 | static void input_seq_print_bitmap(struct seq_file *seq, const char *name, |
1017 | unsigned long *bitmap, int max) | |
1018 | { | |
1019 | int i; | |
15e184af DT |
1020 | bool skip_empty = true; |
1021 | char buf[18]; | |
f96b434d | 1022 | |
969b21cd | 1023 | seq_printf(seq, "B: %s=", name); |
15e184af DT |
1024 | |
1025 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
1026 | if (input_bits_to_string(buf, sizeof(buf), | |
1027 | bitmap[i], skip_empty)) { | |
1028 | skip_empty = false; | |
1029 | seq_printf(seq, "%s%s", buf, i > 0 ? " " : ""); | |
1030 | } | |
1031 | } | |
1032 | ||
1033 | /* | |
1034 | * If no output was produced print a single 0. | |
1035 | */ | |
1036 | if (skip_empty) | |
1037 | seq_puts(seq, "0"); | |
1038 | ||
969b21cd DT |
1039 | seq_putc(seq, '\n'); |
1040 | } | |
f96b434d | 1041 | |
969b21cd DT |
1042 | static int input_devices_seq_show(struct seq_file *seq, void *v) |
1043 | { | |
1044 | struct input_dev *dev = container_of(v, struct input_dev, node); | |
9657d75c | 1045 | const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
969b21cd DT |
1046 | struct input_handle *handle; |
1047 | ||
1048 | seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", | |
1049 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); | |
1050 | ||
1051 | seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); | |
1052 | seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : ""); | |
1053 | seq_printf(seq, "S: Sysfs=%s\n", path ? path : ""); | |
15e03ae8 | 1054 | seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : ""); |
969b21cd DT |
1055 | seq_printf(seq, "H: Handlers="); |
1056 | ||
1057 | list_for_each_entry(handle, &dev->h_list, d_node) | |
1058 | seq_printf(seq, "%s ", handle->name); | |
1059 | seq_putc(seq, '\n'); | |
1060 | ||
85b77200 HR |
1061 | input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX); |
1062 | ||
969b21cd DT |
1063 | input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); |
1064 | if (test_bit(EV_KEY, dev->evbit)) | |
1065 | input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); | |
1066 | if (test_bit(EV_REL, dev->evbit)) | |
1067 | input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); | |
1068 | if (test_bit(EV_ABS, dev->evbit)) | |
1069 | input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); | |
1070 | if (test_bit(EV_MSC, dev->evbit)) | |
1071 | input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); | |
1072 | if (test_bit(EV_LED, dev->evbit)) | |
1073 | input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); | |
1074 | if (test_bit(EV_SND, dev->evbit)) | |
1075 | input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); | |
1076 | if (test_bit(EV_FF, dev->evbit)) | |
1077 | input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); | |
1078 | if (test_bit(EV_SW, dev->evbit)) | |
1079 | input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); | |
1080 | ||
1081 | seq_putc(seq, '\n'); | |
1082 | ||
1083 | kfree(path); | |
1084 | return 0; | |
f96b434d DT |
1085 | } |
1086 | ||
cec69c37 | 1087 | static const struct seq_operations input_devices_seq_ops = { |
969b21cd DT |
1088 | .start = input_devices_seq_start, |
1089 | .next = input_devices_seq_next, | |
1572ca2a | 1090 | .stop = input_seq_stop, |
969b21cd DT |
1091 | .show = input_devices_seq_show, |
1092 | }; | |
1093 | ||
1094 | static int input_proc_devices_open(struct inode *inode, struct file *file) | |
f96b434d | 1095 | { |
969b21cd DT |
1096 | return seq_open(file, &input_devices_seq_ops); |
1097 | } | |
1098 | ||
2b8693c0 | 1099 | static const struct file_operations input_devices_fileops = { |
969b21cd DT |
1100 | .owner = THIS_MODULE, |
1101 | .open = input_proc_devices_open, | |
1102 | .poll = input_proc_devices_poll, | |
1103 | .read = seq_read, | |
1104 | .llseek = seq_lseek, | |
1105 | .release = seq_release, | |
1106 | }; | |
1107 | ||
1108 | static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) | |
1109 | { | |
1572ca2a DT |
1110 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1111 | int error; | |
1112 | ||
1113 | /* We need to fit into seq->private pointer */ | |
1114 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
1115 | ||
1116 | error = mutex_lock_interruptible(&input_mutex); | |
1117 | if (error) { | |
1118 | state->mutex_acquired = false; | |
1119 | return ERR_PTR(error); | |
1120 | } | |
1121 | ||
1122 | state->mutex_acquired = true; | |
1123 | state->pos = *pos; | |
8006479c | 1124 | |
ad5d972c | 1125 | return seq_list_start(&input_handler_list, *pos); |
969b21cd | 1126 | } |
f96b434d | 1127 | |
969b21cd DT |
1128 | static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1129 | { | |
1572ca2a | 1130 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
f96b434d | 1131 | |
1572ca2a DT |
1132 | state->pos = *pos + 1; |
1133 | return seq_list_next(v, &input_handler_list, pos); | |
969b21cd DT |
1134 | } |
1135 | ||
1136 | static int input_handlers_seq_show(struct seq_file *seq, void *v) | |
1137 | { | |
1138 | struct input_handler *handler = container_of(v, struct input_handler, node); | |
1572ca2a | 1139 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
969b21cd | 1140 | |
1572ca2a | 1141 | seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name); |
ef7995f4 DT |
1142 | if (handler->filter) |
1143 | seq_puts(seq, " (filter)"); | |
969b21cd DT |
1144 | if (handler->fops) |
1145 | seq_printf(seq, " Minor=%d", handler->minor); | |
1146 | seq_putc(seq, '\n'); | |
1147 | ||
1148 | return 0; | |
1149 | } | |
1572ca2a | 1150 | |
cec69c37 | 1151 | static const struct seq_operations input_handlers_seq_ops = { |
969b21cd DT |
1152 | .start = input_handlers_seq_start, |
1153 | .next = input_handlers_seq_next, | |
1572ca2a | 1154 | .stop = input_seq_stop, |
969b21cd DT |
1155 | .show = input_handlers_seq_show, |
1156 | }; | |
1157 | ||
1158 | static int input_proc_handlers_open(struct inode *inode, struct file *file) | |
1159 | { | |
1160 | return seq_open(file, &input_handlers_seq_ops); | |
1161 | } | |
1162 | ||
2b8693c0 | 1163 | static const struct file_operations input_handlers_fileops = { |
969b21cd DT |
1164 | .owner = THIS_MODULE, |
1165 | .open = input_proc_handlers_open, | |
1166 | .read = seq_read, | |
1167 | .llseek = seq_lseek, | |
1168 | .release = seq_release, | |
1169 | }; | |
f96b434d DT |
1170 | |
1171 | static int __init input_proc_init(void) | |
1172 | { | |
1173 | struct proc_dir_entry *entry; | |
1174 | ||
9c37066d | 1175 | proc_bus_input_dir = proc_mkdir("bus/input", NULL); |
f96b434d DT |
1176 | if (!proc_bus_input_dir) |
1177 | return -ENOMEM; | |
1178 | ||
c7705f34 DL |
1179 | entry = proc_create("devices", 0, proc_bus_input_dir, |
1180 | &input_devices_fileops); | |
f96b434d DT |
1181 | if (!entry) |
1182 | goto fail1; | |
1183 | ||
c7705f34 DL |
1184 | entry = proc_create("handlers", 0, proc_bus_input_dir, |
1185 | &input_handlers_fileops); | |
f96b434d DT |
1186 | if (!entry) |
1187 | goto fail2; | |
1188 | ||
f96b434d DT |
1189 | return 0; |
1190 | ||
1191 | fail2: remove_proc_entry("devices", proc_bus_input_dir); | |
9c37066d | 1192 | fail1: remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1193 | return -ENOMEM; |
1194 | } | |
1195 | ||
beffbdc2 | 1196 | static void input_proc_exit(void) |
f96b434d DT |
1197 | { |
1198 | remove_proc_entry("devices", proc_bus_input_dir); | |
1199 | remove_proc_entry("handlers", proc_bus_input_dir); | |
9c37066d | 1200 | remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1201 | } |
1202 | ||
1203 | #else /* !CONFIG_PROC_FS */ | |
1204 | static inline void input_wakeup_procfs_readers(void) { } | |
1205 | static inline int input_proc_init(void) { return 0; } | |
1206 | static inline void input_proc_exit(void) { } | |
1207 | #endif | |
1208 | ||
9657d75c DT |
1209 | #define INPUT_DEV_STRING_ATTR_SHOW(name) \ |
1210 | static ssize_t input_dev_show_##name(struct device *dev, \ | |
1211 | struct device_attribute *attr, \ | |
1212 | char *buf) \ | |
1213 | { \ | |
1214 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1215 | \ | |
1216 | return scnprintf(buf, PAGE_SIZE, "%s\n", \ | |
1217 | input_dev->name ? input_dev->name : ""); \ | |
1218 | } \ | |
1219 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL) | |
5c1e9a6a DT |
1220 | |
1221 | INPUT_DEV_STRING_ATTR_SHOW(name); | |
1222 | INPUT_DEV_STRING_ATTR_SHOW(phys); | |
1223 | INPUT_DEV_STRING_ATTR_SHOW(uniq); | |
1224 | ||
ac648a6a DT |
1225 | static int input_print_modalias_bits(char *buf, int size, |
1226 | char name, unsigned long *bm, | |
1227 | unsigned int min_bit, unsigned int max_bit) | |
1d8f430c | 1228 | { |
ac648a6a | 1229 | int len = 0, i; |
1d8f430c | 1230 | |
ac648a6a DT |
1231 | len += snprintf(buf, max(size, 0), "%c", name); |
1232 | for (i = min_bit; i < max_bit; i++) | |
7b19ada2 | 1233 | if (bm[BIT_WORD(i)] & BIT_MASK(i)) |
ac648a6a | 1234 | len += snprintf(buf + len, max(size - len, 0), "%X,", i); |
1d8f430c RR |
1235 | return len; |
1236 | } | |
1237 | ||
2db66876 DT |
1238 | static int input_print_modalias(char *buf, int size, struct input_dev *id, |
1239 | int add_cr) | |
1d8f430c | 1240 | { |
bd37e5a9 | 1241 | int len; |
1d8f430c | 1242 | |
ac648a6a DT |
1243 | len = snprintf(buf, max(size, 0), |
1244 | "input:b%04Xv%04Xp%04Xe%04X-", | |
1245 | id->id.bustype, id->id.vendor, | |
1246 | id->id.product, id->id.version); | |
1247 | ||
1248 | len += input_print_modalias_bits(buf + len, size - len, | |
1249 | 'e', id->evbit, 0, EV_MAX); | |
1250 | len += input_print_modalias_bits(buf + len, size - len, | |
1251 | 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); | |
1252 | len += input_print_modalias_bits(buf + len, size - len, | |
1253 | 'r', id->relbit, 0, REL_MAX); | |
1254 | len += input_print_modalias_bits(buf + len, size - len, | |
1255 | 'a', id->absbit, 0, ABS_MAX); | |
1256 | len += input_print_modalias_bits(buf + len, size - len, | |
1257 | 'm', id->mscbit, 0, MSC_MAX); | |
1258 | len += input_print_modalias_bits(buf + len, size - len, | |
1259 | 'l', id->ledbit, 0, LED_MAX); | |
1260 | len += input_print_modalias_bits(buf + len, size - len, | |
1261 | 's', id->sndbit, 0, SND_MAX); | |
1262 | len += input_print_modalias_bits(buf + len, size - len, | |
1263 | 'f', id->ffbit, 0, FF_MAX); | |
1264 | len += input_print_modalias_bits(buf + len, size - len, | |
1265 | 'w', id->swbit, 0, SW_MAX); | |
2db66876 DT |
1266 | |
1267 | if (add_cr) | |
ac648a6a | 1268 | len += snprintf(buf + len, max(size - len, 0), "\n"); |
2db66876 | 1269 | |
bd37e5a9 KS |
1270 | return len; |
1271 | } | |
1272 | ||
9657d75c DT |
1273 | static ssize_t input_dev_show_modalias(struct device *dev, |
1274 | struct device_attribute *attr, | |
1275 | char *buf) | |
bd37e5a9 KS |
1276 | { |
1277 | struct input_dev *id = to_input_dev(dev); | |
1278 | ssize_t len; | |
1279 | ||
2db66876 DT |
1280 | len = input_print_modalias(buf, PAGE_SIZE, id, 1); |
1281 | ||
8a3cf456 | 1282 | return min_t(int, len, PAGE_SIZE); |
1d8f430c | 1283 | } |
9657d75c | 1284 | static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); |
1d8f430c | 1285 | |
85b77200 HR |
1286 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1287 | int max, int add_cr); | |
1288 | ||
1289 | static ssize_t input_dev_show_properties(struct device *dev, | |
1290 | struct device_attribute *attr, | |
1291 | char *buf) | |
1292 | { | |
1293 | struct input_dev *input_dev = to_input_dev(dev); | |
1294 | int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit, | |
1295 | INPUT_PROP_MAX, true); | |
1296 | return min_t(int, len, PAGE_SIZE); | |
1297 | } | |
1298 | static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL); | |
1299 | ||
629b77a4 | 1300 | static struct attribute *input_dev_attrs[] = { |
9657d75c DT |
1301 | &dev_attr_name.attr, |
1302 | &dev_attr_phys.attr, | |
1303 | &dev_attr_uniq.attr, | |
1304 | &dev_attr_modalias.attr, | |
85b77200 | 1305 | &dev_attr_properties.attr, |
629b77a4 GKH |
1306 | NULL |
1307 | }; | |
1308 | ||
bd0ef235 | 1309 | static struct attribute_group input_dev_attr_group = { |
629b77a4 | 1310 | .attrs = input_dev_attrs, |
5c1e9a6a DT |
1311 | }; |
1312 | ||
9657d75c DT |
1313 | #define INPUT_DEV_ID_ATTR(name) \ |
1314 | static ssize_t input_dev_show_id_##name(struct device *dev, \ | |
1315 | struct device_attribute *attr, \ | |
1316 | char *buf) \ | |
1317 | { \ | |
1318 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1319 | return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \ | |
1320 | } \ | |
1321 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL) | |
5c1e9a6a DT |
1322 | |
1323 | INPUT_DEV_ID_ATTR(bustype); | |
1324 | INPUT_DEV_ID_ATTR(vendor); | |
1325 | INPUT_DEV_ID_ATTR(product); | |
1326 | INPUT_DEV_ID_ATTR(version); | |
1327 | ||
1328 | static struct attribute *input_dev_id_attrs[] = { | |
9657d75c DT |
1329 | &dev_attr_bustype.attr, |
1330 | &dev_attr_vendor.attr, | |
1331 | &dev_attr_product.attr, | |
1332 | &dev_attr_version.attr, | |
5c1e9a6a DT |
1333 | NULL |
1334 | }; | |
1335 | ||
1336 | static struct attribute_group input_dev_id_attr_group = { | |
1337 | .name = "id", | |
1338 | .attrs = input_dev_id_attrs, | |
1339 | }; | |
1340 | ||
969b21cd DT |
1341 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1342 | int max, int add_cr) | |
1343 | { | |
1344 | int i; | |
1345 | int len = 0; | |
15e184af DT |
1346 | bool skip_empty = true; |
1347 | ||
1348 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
1349 | len += input_bits_to_string(buf + len, max(buf_size - len, 0), | |
1350 | bitmap[i], skip_empty); | |
1351 | if (len) { | |
1352 | skip_empty = false; | |
1353 | if (i > 0) | |
1354 | len += snprintf(buf + len, max(buf_size - len, 0), " "); | |
1355 | } | |
1356 | } | |
969b21cd | 1357 | |
15e184af DT |
1358 | /* |
1359 | * If no output was produced print a single 0. | |
1360 | */ | |
1361 | if (len == 0) | |
1362 | len = snprintf(buf, buf_size, "%d", 0); | |
969b21cd DT |
1363 | |
1364 | if (add_cr) | |
1365 | len += snprintf(buf + len, max(buf_size - len, 0), "\n"); | |
1366 | ||
1367 | return len; | |
1368 | } | |
1369 | ||
9657d75c DT |
1370 | #define INPUT_DEV_CAP_ATTR(ev, bm) \ |
1371 | static ssize_t input_dev_show_cap_##bm(struct device *dev, \ | |
1372 | struct device_attribute *attr, \ | |
1373 | char *buf) \ | |
1374 | { \ | |
1375 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1376 | int len = input_print_bitmap(buf, PAGE_SIZE, \ | |
15e184af DT |
1377 | input_dev->bm##bit, ev##_MAX, \ |
1378 | true); \ | |
9657d75c DT |
1379 | return min_t(int, len, PAGE_SIZE); \ |
1380 | } \ | |
1381 | static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL) | |
5c1e9a6a DT |
1382 | |
1383 | INPUT_DEV_CAP_ATTR(EV, ev); | |
1384 | INPUT_DEV_CAP_ATTR(KEY, key); | |
1385 | INPUT_DEV_CAP_ATTR(REL, rel); | |
1386 | INPUT_DEV_CAP_ATTR(ABS, abs); | |
1387 | INPUT_DEV_CAP_ATTR(MSC, msc); | |
1388 | INPUT_DEV_CAP_ATTR(LED, led); | |
1389 | INPUT_DEV_CAP_ATTR(SND, snd); | |
1390 | INPUT_DEV_CAP_ATTR(FF, ff); | |
1391 | INPUT_DEV_CAP_ATTR(SW, sw); | |
1392 | ||
1393 | static struct attribute *input_dev_caps_attrs[] = { | |
9657d75c DT |
1394 | &dev_attr_ev.attr, |
1395 | &dev_attr_key.attr, | |
1396 | &dev_attr_rel.attr, | |
1397 | &dev_attr_abs.attr, | |
1398 | &dev_attr_msc.attr, | |
1399 | &dev_attr_led.attr, | |
1400 | &dev_attr_snd.attr, | |
1401 | &dev_attr_ff.attr, | |
1402 | &dev_attr_sw.attr, | |
5c1e9a6a DT |
1403 | NULL |
1404 | }; | |
1405 | ||
1406 | static struct attribute_group input_dev_caps_attr_group = { | |
1407 | .name = "capabilities", | |
1408 | .attrs = input_dev_caps_attrs, | |
1409 | }; | |
1410 | ||
a4dbd674 | 1411 | static const struct attribute_group *input_dev_attr_groups[] = { |
cb9def4d DT |
1412 | &input_dev_attr_group, |
1413 | &input_dev_id_attr_group, | |
1414 | &input_dev_caps_attr_group, | |
1415 | NULL | |
1416 | }; | |
1417 | ||
9657d75c | 1418 | static void input_dev_release(struct device *device) |
d19fbe8a | 1419 | { |
9657d75c | 1420 | struct input_dev *dev = to_input_dev(device); |
d19fbe8a | 1421 | |
509ca1a9 | 1422 | input_ff_destroy(dev); |
40d007e7 | 1423 | input_mt_destroy_slots(dev); |
d31b2865 | 1424 | kfree(dev->absinfo); |
d19fbe8a | 1425 | kfree(dev); |
509ca1a9 | 1426 | |
d19fbe8a DT |
1427 | module_put(THIS_MODULE); |
1428 | } | |
1429 | ||
a7fadbe1 | 1430 | /* |
312c004d | 1431 | * Input uevent interface - loading event handlers based on |
a7fadbe1 DT |
1432 | * device bitfields. |
1433 | */ | |
7eff2e7a | 1434 | static int input_add_uevent_bm_var(struct kobj_uevent_env *env, |
ac648a6a | 1435 | const char *name, unsigned long *bitmap, int max) |
a7fadbe1 | 1436 | { |
7eff2e7a | 1437 | int len; |
a7fadbe1 | 1438 | |
fcd3027a | 1439 | if (add_uevent_var(env, "%s", name)) |
a7fadbe1 DT |
1440 | return -ENOMEM; |
1441 | ||
7eff2e7a KS |
1442 | len = input_print_bitmap(&env->buf[env->buflen - 1], |
1443 | sizeof(env->buf) - env->buflen, | |
15e184af | 1444 | bitmap, max, false); |
7eff2e7a | 1445 | if (len >= (sizeof(env->buf) - env->buflen)) |
a7fadbe1 DT |
1446 | return -ENOMEM; |
1447 | ||
7eff2e7a | 1448 | env->buflen += len; |
a7fadbe1 DT |
1449 | return 0; |
1450 | } | |
1451 | ||
7eff2e7a | 1452 | static int input_add_uevent_modalias_var(struct kobj_uevent_env *env, |
ac648a6a DT |
1453 | struct input_dev *dev) |
1454 | { | |
7eff2e7a | 1455 | int len; |
ac648a6a | 1456 | |
7eff2e7a | 1457 | if (add_uevent_var(env, "MODALIAS=")) |
ac648a6a DT |
1458 | return -ENOMEM; |
1459 | ||
7eff2e7a KS |
1460 | len = input_print_modalias(&env->buf[env->buflen - 1], |
1461 | sizeof(env->buf) - env->buflen, | |
1462 | dev, 0); | |
1463 | if (len >= (sizeof(env->buf) - env->buflen)) | |
ac648a6a DT |
1464 | return -ENOMEM; |
1465 | ||
7eff2e7a | 1466 | env->buflen += len; |
ac648a6a DT |
1467 | return 0; |
1468 | } | |
1469 | ||
a7fadbe1 DT |
1470 | #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \ |
1471 | do { \ | |
7eff2e7a | 1472 | int err = add_uevent_var(env, fmt, val); \ |
a7fadbe1 DT |
1473 | if (err) \ |
1474 | return err; \ | |
1475 | } while (0) | |
1476 | ||
1477 | #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \ | |
1478 | do { \ | |
7eff2e7a | 1479 | int err = input_add_uevent_bm_var(env, name, bm, max); \ |
a7fadbe1 DT |
1480 | if (err) \ |
1481 | return err; \ | |
1482 | } while (0) | |
1483 | ||
ac648a6a DT |
1484 | #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \ |
1485 | do { \ | |
7eff2e7a | 1486 | int err = input_add_uevent_modalias_var(env, dev); \ |
ac648a6a DT |
1487 | if (err) \ |
1488 | return err; \ | |
1489 | } while (0) | |
1490 | ||
7eff2e7a | 1491 | static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env) |
a7fadbe1 | 1492 | { |
9657d75c | 1493 | struct input_dev *dev = to_input_dev(device); |
a7fadbe1 DT |
1494 | |
1495 | INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x", | |
1496 | dev->id.bustype, dev->id.vendor, | |
1497 | dev->id.product, dev->id.version); | |
1498 | if (dev->name) | |
1499 | INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); | |
1500 | if (dev->phys) | |
1501 | INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); | |
08de1f04 | 1502 | if (dev->uniq) |
a7fadbe1 DT |
1503 | INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); |
1504 | ||
85b77200 HR |
1505 | INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX); |
1506 | ||
a7fadbe1 DT |
1507 | INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX); |
1508 | if (test_bit(EV_KEY, dev->evbit)) | |
1509 | INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX); | |
1510 | if (test_bit(EV_REL, dev->evbit)) | |
1511 | INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX); | |
1512 | if (test_bit(EV_ABS, dev->evbit)) | |
1513 | INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX); | |
1514 | if (test_bit(EV_MSC, dev->evbit)) | |
1515 | INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX); | |
1516 | if (test_bit(EV_LED, dev->evbit)) | |
1517 | INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX); | |
1518 | if (test_bit(EV_SND, dev->evbit)) | |
1519 | INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX); | |
1520 | if (test_bit(EV_FF, dev->evbit)) | |
1521 | INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX); | |
1522 | if (test_bit(EV_SW, dev->evbit)) | |
1523 | INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); | |
1524 | ||
ac648a6a | 1525 | INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); |
a7fadbe1 DT |
1526 | |
1527 | return 0; | |
1528 | } | |
1529 | ||
3cc96351 DT |
1530 | #define INPUT_DO_TOGGLE(dev, type, bits, on) \ |
1531 | do { \ | |
1532 | int i; \ | |
1533 | bool active; \ | |
1534 | \ | |
1535 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1536 | break; \ | |
1537 | \ | |
1538 | for (i = 0; i < type##_MAX; i++) { \ | |
1539 | if (!test_bit(i, dev->bits##bit)) \ | |
1540 | continue; \ | |
1541 | \ | |
1542 | active = test_bit(i, dev->bits); \ | |
1543 | if (!active && !on) \ | |
1544 | continue; \ | |
1545 | \ | |
1546 | dev->event(dev, EV_##type, i, on ? active : 0); \ | |
1547 | } \ | |
ffd0db97 DT |
1548 | } while (0) |
1549 | ||
b50b5216 | 1550 | static void input_dev_toggle(struct input_dev *dev, bool activate) |
ffd0db97 DT |
1551 | { |
1552 | if (!dev->event) | |
1553 | return; | |
1554 | ||
1555 | INPUT_DO_TOGGLE(dev, LED, led, activate); | |
1556 | INPUT_DO_TOGGLE(dev, SND, snd, activate); | |
1557 | ||
1558 | if (activate && test_bit(EV_REP, dev->evbit)) { | |
1559 | dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]); | |
1560 | dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]); | |
1561 | } | |
1562 | } | |
1563 | ||
b50b5216 DT |
1564 | /** |
1565 | * input_reset_device() - reset/restore the state of input device | |
1566 | * @dev: input device whose state needs to be reset | |
1567 | * | |
1568 | * This function tries to reset the state of an opened input device and | |
1569 | * bring internal state and state if the hardware in sync with each other. | |
1570 | * We mark all keys as released, restore LED state, repeat rate, etc. | |
1571 | */ | |
1572 | void input_reset_device(struct input_dev *dev) | |
1573 | { | |
1574 | mutex_lock(&dev->mutex); | |
1575 | ||
1576 | if (dev->users) { | |
1577 | input_dev_toggle(dev, true); | |
1578 | ||
1579 | /* | |
1580 | * Keys that have been pressed at suspend time are unlikely | |
1581 | * to be still pressed when we resume. | |
1582 | */ | |
1583 | spin_lock_irq(&dev->event_lock); | |
1584 | input_dev_release_keys(dev); | |
1585 | spin_unlock_irq(&dev->event_lock); | |
1586 | } | |
1587 | ||
1588 | mutex_unlock(&dev->mutex); | |
1589 | } | |
1590 | EXPORT_SYMBOL(input_reset_device); | |
1591 | ||
1592 | #ifdef CONFIG_PM | |
ffd0db97 DT |
1593 | static int input_dev_suspend(struct device *dev) |
1594 | { | |
1595 | struct input_dev *input_dev = to_input_dev(dev); | |
1596 | ||
1597 | mutex_lock(&input_dev->mutex); | |
b50b5216 DT |
1598 | |
1599 | if (input_dev->users) | |
1600 | input_dev_toggle(input_dev, false); | |
1601 | ||
ffd0db97 DT |
1602 | mutex_unlock(&input_dev->mutex); |
1603 | ||
1604 | return 0; | |
1605 | } | |
1606 | ||
1607 | static int input_dev_resume(struct device *dev) | |
1608 | { | |
1609 | struct input_dev *input_dev = to_input_dev(dev); | |
1610 | ||
b50b5216 | 1611 | input_reset_device(input_dev); |
ffd0db97 DT |
1612 | |
1613 | return 0; | |
1614 | } | |
1615 | ||
1616 | static const struct dev_pm_ops input_dev_pm_ops = { | |
1617 | .suspend = input_dev_suspend, | |
1618 | .resume = input_dev_resume, | |
1619 | .poweroff = input_dev_suspend, | |
1620 | .restore = input_dev_resume, | |
1621 | }; | |
1622 | #endif /* CONFIG_PM */ | |
1623 | ||
9657d75c DT |
1624 | static struct device_type input_dev_type = { |
1625 | .groups = input_dev_attr_groups, | |
1626 | .release = input_dev_release, | |
1627 | .uevent = input_dev_uevent, | |
ffd0db97 DT |
1628 | #ifdef CONFIG_PM |
1629 | .pm = &input_dev_pm_ops, | |
1630 | #endif | |
9657d75c DT |
1631 | }; |
1632 | ||
2c9ede55 | 1633 | static char *input_devnode(struct device *dev, umode_t *mode) |
aa5ed63e KS |
1634 | { |
1635 | return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev)); | |
1636 | } | |
1637 | ||
ea9f240b | 1638 | struct class input_class = { |
9657d75c | 1639 | .name = "input", |
e454cea2 | 1640 | .devnode = input_devnode, |
d19fbe8a | 1641 | }; |
ca56fe07 | 1642 | EXPORT_SYMBOL_GPL(input_class); |
d19fbe8a | 1643 | |
1447190e DT |
1644 | /** |
1645 | * input_allocate_device - allocate memory for new input device | |
1646 | * | |
1647 | * Returns prepared struct input_dev or NULL. | |
1648 | * | |
1649 | * NOTE: Use input_free_device() to free devices that have not been | |
1650 | * registered; input_unregister_device() should be used for already | |
1651 | * registered devices. | |
1652 | */ | |
d19fbe8a DT |
1653 | struct input_dev *input_allocate_device(void) |
1654 | { | |
1655 | struct input_dev *dev; | |
1656 | ||
1657 | dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); | |
1658 | if (dev) { | |
9657d75c DT |
1659 | dev->dev.type = &input_dev_type; |
1660 | dev->dev.class = &input_class; | |
1661 | device_initialize(&dev->dev); | |
f60d2b11 | 1662 | mutex_init(&dev->mutex); |
8006479c | 1663 | spin_lock_init(&dev->event_lock); |
d19fbe8a DT |
1664 | INIT_LIST_HEAD(&dev->h_list); |
1665 | INIT_LIST_HEAD(&dev->node); | |
655816e4 DT |
1666 | |
1667 | __module_get(THIS_MODULE); | |
d19fbe8a DT |
1668 | } |
1669 | ||
1670 | return dev; | |
1671 | } | |
ca56fe07 | 1672 | EXPORT_SYMBOL(input_allocate_device); |
d19fbe8a | 1673 | |
1447190e DT |
1674 | /** |
1675 | * input_free_device - free memory occupied by input_dev structure | |
1676 | * @dev: input device to free | |
1677 | * | |
1678 | * This function should only be used if input_register_device() | |
1679 | * was not called yet or if it failed. Once device was registered | |
1680 | * use input_unregister_device() and memory will be freed once last | |
8006479c | 1681 | * reference to the device is dropped. |
1447190e DT |
1682 | * |
1683 | * Device should be allocated by input_allocate_device(). | |
1684 | * | |
1685 | * NOTE: If there are references to the input device then memory | |
1686 | * will not be freed until last reference is dropped. | |
1687 | */ | |
f60d2b11 DT |
1688 | void input_free_device(struct input_dev *dev) |
1689 | { | |
54f9e36c | 1690 | if (dev) |
f60d2b11 | 1691 | input_put_device(dev); |
f60d2b11 | 1692 | } |
ca56fe07 | 1693 | EXPORT_SYMBOL(input_free_device); |
f60d2b11 | 1694 | |
534565f2 DT |
1695 | /** |
1696 | * input_set_capability - mark device as capable of a certain event | |
1697 | * @dev: device that is capable of emitting or accepting event | |
1698 | * @type: type of the event (EV_KEY, EV_REL, etc...) | |
1699 | * @code: event code | |
1700 | * | |
1701 | * In addition to setting up corresponding bit in appropriate capability | |
1702 | * bitmap the function also adjusts dev->evbit. | |
1703 | */ | |
1704 | void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code) | |
1705 | { | |
1706 | switch (type) { | |
1707 | case EV_KEY: | |
1708 | __set_bit(code, dev->keybit); | |
1709 | break; | |
1710 | ||
1711 | case EV_REL: | |
1712 | __set_bit(code, dev->relbit); | |
1713 | break; | |
1714 | ||
1715 | case EV_ABS: | |
1716 | __set_bit(code, dev->absbit); | |
1717 | break; | |
1718 | ||
1719 | case EV_MSC: | |
1720 | __set_bit(code, dev->mscbit); | |
1721 | break; | |
1722 | ||
1723 | case EV_SW: | |
1724 | __set_bit(code, dev->swbit); | |
1725 | break; | |
1726 | ||
1727 | case EV_LED: | |
1728 | __set_bit(code, dev->ledbit); | |
1729 | break; | |
1730 | ||
1731 | case EV_SND: | |
1732 | __set_bit(code, dev->sndbit); | |
1733 | break; | |
1734 | ||
1735 | case EV_FF: | |
1736 | __set_bit(code, dev->ffbit); | |
1737 | break; | |
1738 | ||
22d1c398 DB |
1739 | case EV_PWR: |
1740 | /* do nothing */ | |
1741 | break; | |
1742 | ||
534565f2 | 1743 | default: |
da0c4901 JP |
1744 | pr_err("input_set_capability: unknown type %u (code %u)\n", |
1745 | type, code); | |
534565f2 DT |
1746 | dump_stack(); |
1747 | return; | |
1748 | } | |
1749 | ||
1750 | __set_bit(type, dev->evbit); | |
1751 | } | |
1752 | EXPORT_SYMBOL(input_set_capability); | |
1753 | ||
80b4895a JB |
1754 | static unsigned int input_estimate_events_per_packet(struct input_dev *dev) |
1755 | { | |
1756 | int mt_slots; | |
1757 | int i; | |
1758 | unsigned int events; | |
1759 | ||
8d18fba2 HR |
1760 | if (dev->mt) { |
1761 | mt_slots = dev->mt->num_slots; | |
80b4895a JB |
1762 | } else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit)) { |
1763 | mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum - | |
1764 | dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1, | |
8c127f07 | 1765 | mt_slots = clamp(mt_slots, 2, 32); |
80b4895a JB |
1766 | } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) { |
1767 | mt_slots = 2; | |
1768 | } else { | |
1769 | mt_slots = 0; | |
1770 | } | |
1771 | ||
1772 | events = mt_slots + 1; /* count SYN_MT_REPORT and SYN_REPORT */ | |
1773 | ||
1774 | for (i = 0; i < ABS_CNT; i++) { | |
1775 | if (test_bit(i, dev->absbit)) { | |
1776 | if (input_is_mt_axis(i)) | |
1777 | events += mt_slots; | |
1778 | else | |
1779 | events++; | |
1780 | } | |
1781 | } | |
1782 | ||
1783 | for (i = 0; i < REL_CNT; i++) | |
1784 | if (test_bit(i, dev->relbit)) | |
1785 | events++; | |
1786 | ||
7c75bf99 HR |
1787 | /* Make room for KEY and MSC events */ |
1788 | events += 7; | |
1789 | ||
80b4895a JB |
1790 | return events; |
1791 | } | |
1792 | ||
92a3a587 DT |
1793 | #define INPUT_CLEANSE_BITMASK(dev, type, bits) \ |
1794 | do { \ | |
1795 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1796 | memset(dev->bits##bit, 0, \ | |
1797 | sizeof(dev->bits##bit)); \ | |
1798 | } while (0) | |
1799 | ||
1800 | static void input_cleanse_bitmasks(struct input_dev *dev) | |
1801 | { | |
1802 | INPUT_CLEANSE_BITMASK(dev, KEY, key); | |
1803 | INPUT_CLEANSE_BITMASK(dev, REL, rel); | |
1804 | INPUT_CLEANSE_BITMASK(dev, ABS, abs); | |
1805 | INPUT_CLEANSE_BITMASK(dev, MSC, msc); | |
1806 | INPUT_CLEANSE_BITMASK(dev, LED, led); | |
1807 | INPUT_CLEANSE_BITMASK(dev, SND, snd); | |
1808 | INPUT_CLEANSE_BITMASK(dev, FF, ff); | |
1809 | INPUT_CLEANSE_BITMASK(dev, SW, sw); | |
1810 | } | |
1811 | ||
8006479c DT |
1812 | /** |
1813 | * input_register_device - register device with input core | |
1814 | * @dev: device to be registered | |
1815 | * | |
1816 | * This function registers device with input core. The device must be | |
1817 | * allocated with input_allocate_device() and all it's capabilities | |
1818 | * set up before registering. | |
1819 | * If function fails the device must be freed with input_free_device(). | |
1820 | * Once device has been successfully registered it can be unregistered | |
1821 | * with input_unregister_device(); input_free_device() should not be | |
1822 | * called in this case. | |
1823 | */ | |
5f945489 | 1824 | int input_register_device(struct input_dev *dev) |
1da177e4 | 1825 | { |
bd0ef235 | 1826 | static atomic_t input_no = ATOMIC_INIT(0); |
1da177e4 | 1827 | struct input_handler *handler; |
7c75bf99 | 1828 | unsigned int packet_size; |
bd0ef235 DT |
1829 | const char *path; |
1830 | int error; | |
1da177e4 | 1831 | |
4f93df40 | 1832 | /* Every input device generates EV_SYN/SYN_REPORT events. */ |
8006479c | 1833 | __set_bit(EV_SYN, dev->evbit); |
0fbf87ca | 1834 | |
4f93df40 DT |
1835 | /* KEY_RESERVED is not supposed to be transmitted to userspace. */ |
1836 | __clear_bit(KEY_RESERVED, dev->keybit); | |
1837 | ||
92a3a587 DT |
1838 | /* Make sure that bitmasks not mentioned in dev->evbit are clean. */ |
1839 | input_cleanse_bitmasks(dev); | |
1840 | ||
7c75bf99 HR |
1841 | packet_size = input_estimate_events_per_packet(dev); |
1842 | if (dev->hint_events_per_packet < packet_size) | |
1843 | dev->hint_events_per_packet = packet_size; | |
80b4895a | 1844 | |
1da177e4 LT |
1845 | /* |
1846 | * If delay and period are pre-set by the driver, then autorepeating | |
1847 | * is handled by the driver itself and we don't do it in input.c. | |
1848 | */ | |
1da177e4 LT |
1849 | init_timer(&dev->timer); |
1850 | if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { | |
1851 | dev->timer.data = (long) dev; | |
1852 | dev->timer.function = input_repeat_key; | |
1853 | dev->rep[REP_DELAY] = 250; | |
1854 | dev->rep[REP_PERIOD] = 33; | |
1855 | } | |
1856 | ||
aebd636b DT |
1857 | if (!dev->getkeycode) |
1858 | dev->getkeycode = input_default_getkeycode; | |
c8e4c772 | 1859 | |
aebd636b DT |
1860 | if (!dev->setkeycode) |
1861 | dev->setkeycode = input_default_setkeycode; | |
c8e4c772 | 1862 | |
a6c2490f KS |
1863 | dev_set_name(&dev->dev, "input%ld", |
1864 | (unsigned long) atomic_inc_return(&input_no) - 1); | |
bd0ef235 | 1865 | |
9657d75c | 1866 | error = device_add(&dev->dev); |
bd0ef235 DT |
1867 | if (error) |
1868 | return error; | |
1869 | ||
9657d75c | 1870 | path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
da0c4901 JP |
1871 | pr_info("%s as %s\n", |
1872 | dev->name ? dev->name : "Unspecified device", | |
1873 | path ? path : "N/A"); | |
bd0ef235 | 1874 | kfree(path); |
10204020 | 1875 | |
8006479c DT |
1876 | error = mutex_lock_interruptible(&input_mutex); |
1877 | if (error) { | |
1878 | device_del(&dev->dev); | |
1879 | return error; | |
1880 | } | |
1881 | ||
1882 | list_add_tail(&dev->node, &input_dev_list); | |
1883 | ||
1da177e4 | 1884 | list_for_each_entry(handler, &input_handler_list, node) |
5b2a0826 | 1885 | input_attach_handler(dev, handler); |
1da177e4 | 1886 | |
f96b434d | 1887 | input_wakeup_procfs_readers(); |
5f945489 | 1888 | |
8006479c DT |
1889 | mutex_unlock(&input_mutex); |
1890 | ||
5f945489 | 1891 | return 0; |
1da177e4 | 1892 | } |
ca56fe07 | 1893 | EXPORT_SYMBOL(input_register_device); |
1da177e4 | 1894 | |
8006479c DT |
1895 | /** |
1896 | * input_unregister_device - unregister previously registered device | |
1897 | * @dev: device to be unregistered | |
1898 | * | |
1899 | * This function unregisters an input device. Once device is unregistered | |
1900 | * the caller should not try to access it as it may get freed at any moment. | |
1901 | */ | |
1da177e4 LT |
1902 | void input_unregister_device(struct input_dev *dev) |
1903 | { | |
5b2a0826 | 1904 | struct input_handle *handle, *next; |
1da177e4 | 1905 | |
8006479c | 1906 | input_disconnect_device(dev); |
1da177e4 | 1907 | |
8006479c | 1908 | mutex_lock(&input_mutex); |
1da177e4 | 1909 | |
5b2a0826 | 1910 | list_for_each_entry_safe(handle, next, &dev->h_list, d_node) |
1da177e4 | 1911 | handle->handler->disconnect(handle); |
5b2a0826 | 1912 | WARN_ON(!list_empty(&dev->h_list)); |
1da177e4 | 1913 | |
8006479c | 1914 | del_timer_sync(&dev->timer); |
1da177e4 LT |
1915 | list_del_init(&dev->node); |
1916 | ||
f96b434d | 1917 | input_wakeup_procfs_readers(); |
8006479c DT |
1918 | |
1919 | mutex_unlock(&input_mutex); | |
1920 | ||
1921 | device_unregister(&dev->dev); | |
1da177e4 | 1922 | } |
ca56fe07 | 1923 | EXPORT_SYMBOL(input_unregister_device); |
1da177e4 | 1924 | |
8006479c DT |
1925 | /** |
1926 | * input_register_handler - register a new input handler | |
1927 | * @handler: handler to be registered | |
1928 | * | |
1929 | * This function registers a new input handler (interface) for input | |
1930 | * devices in the system and attaches it to all input devices that | |
1931 | * are compatible with the handler. | |
1932 | */ | |
4263cf0f | 1933 | int input_register_handler(struct input_handler *handler) |
1da177e4 LT |
1934 | { |
1935 | struct input_dev *dev; | |
8006479c DT |
1936 | int retval; |
1937 | ||
1938 | retval = mutex_lock_interruptible(&input_mutex); | |
1939 | if (retval) | |
1940 | return retval; | |
1da177e4 | 1941 | |
1da177e4 LT |
1942 | INIT_LIST_HEAD(&handler->h_list); |
1943 | ||
4263cf0f | 1944 | if (handler->fops != NULL) { |
8006479c DT |
1945 | if (input_table[handler->minor >> 5]) { |
1946 | retval = -EBUSY; | |
1947 | goto out; | |
1948 | } | |
1da177e4 | 1949 | input_table[handler->minor >> 5] = handler; |
4263cf0f | 1950 | } |
1da177e4 LT |
1951 | |
1952 | list_add_tail(&handler->node, &input_handler_list); | |
1953 | ||
1954 | list_for_each_entry(dev, &input_dev_list, node) | |
5b2a0826 | 1955 | input_attach_handler(dev, handler); |
1da177e4 | 1956 | |
f96b434d | 1957 | input_wakeup_procfs_readers(); |
8006479c DT |
1958 | |
1959 | out: | |
1960 | mutex_unlock(&input_mutex); | |
1961 | return retval; | |
1da177e4 | 1962 | } |
ca56fe07 | 1963 | EXPORT_SYMBOL(input_register_handler); |
1da177e4 | 1964 | |
8006479c DT |
1965 | /** |
1966 | * input_unregister_handler - unregisters an input handler | |
1967 | * @handler: handler to be unregistered | |
1968 | * | |
1969 | * This function disconnects a handler from its input devices and | |
1970 | * removes it from lists of known handlers. | |
1971 | */ | |
1da177e4 LT |
1972 | void input_unregister_handler(struct input_handler *handler) |
1973 | { | |
5b2a0826 | 1974 | struct input_handle *handle, *next; |
1da177e4 | 1975 | |
8006479c DT |
1976 | mutex_lock(&input_mutex); |
1977 | ||
5b2a0826 | 1978 | list_for_each_entry_safe(handle, next, &handler->h_list, h_node) |
1da177e4 | 1979 | handler->disconnect(handle); |
5b2a0826 | 1980 | WARN_ON(!list_empty(&handler->h_list)); |
1da177e4 LT |
1981 | |
1982 | list_del_init(&handler->node); | |
1983 | ||
1984 | if (handler->fops != NULL) | |
1985 | input_table[handler->minor >> 5] = NULL; | |
1986 | ||
f96b434d | 1987 | input_wakeup_procfs_readers(); |
8006479c DT |
1988 | |
1989 | mutex_unlock(&input_mutex); | |
1da177e4 | 1990 | } |
ca56fe07 | 1991 | EXPORT_SYMBOL(input_unregister_handler); |
1da177e4 | 1992 | |
66d2a595 DT |
1993 | /** |
1994 | * input_handler_for_each_handle - handle iterator | |
1995 | * @handler: input handler to iterate | |
1996 | * @data: data for the callback | |
1997 | * @fn: function to be called for each handle | |
1998 | * | |
1999 | * Iterate over @bus's list of devices, and call @fn for each, passing | |
2000 | * it @data and stop when @fn returns a non-zero value. The function is | |
2001 | * using RCU to traverse the list and therefore may be usind in atonic | |
2002 | * contexts. The @fn callback is invoked from RCU critical section and | |
2003 | * thus must not sleep. | |
2004 | */ | |
2005 | int input_handler_for_each_handle(struct input_handler *handler, void *data, | |
2006 | int (*fn)(struct input_handle *, void *)) | |
2007 | { | |
2008 | struct input_handle *handle; | |
2009 | int retval = 0; | |
2010 | ||
2011 | rcu_read_lock(); | |
2012 | ||
2013 | list_for_each_entry_rcu(handle, &handler->h_list, h_node) { | |
2014 | retval = fn(handle, data); | |
2015 | if (retval) | |
2016 | break; | |
2017 | } | |
2018 | ||
2019 | rcu_read_unlock(); | |
2020 | ||
2021 | return retval; | |
2022 | } | |
2023 | EXPORT_SYMBOL(input_handler_for_each_handle); | |
2024 | ||
8006479c DT |
2025 | /** |
2026 | * input_register_handle - register a new input handle | |
2027 | * @handle: handle to register | |
2028 | * | |
2029 | * This function puts a new input handle onto device's | |
2030 | * and handler's lists so that events can flow through | |
2031 | * it once it is opened using input_open_device(). | |
2032 | * | |
2033 | * This function is supposed to be called from handler's | |
2034 | * connect() method. | |
2035 | */ | |
5b2a0826 DT |
2036 | int input_register_handle(struct input_handle *handle) |
2037 | { | |
2038 | struct input_handler *handler = handle->handler; | |
8006479c DT |
2039 | struct input_dev *dev = handle->dev; |
2040 | int error; | |
2041 | ||
2042 | /* | |
2043 | * We take dev->mutex here to prevent race with | |
2044 | * input_release_device(). | |
2045 | */ | |
2046 | error = mutex_lock_interruptible(&dev->mutex); | |
2047 | if (error) | |
2048 | return error; | |
ef7995f4 DT |
2049 | |
2050 | /* | |
2051 | * Filters go to the head of the list, normal handlers | |
2052 | * to the tail. | |
2053 | */ | |
2054 | if (handler->filter) | |
2055 | list_add_rcu(&handle->d_node, &dev->h_list); | |
2056 | else | |
2057 | list_add_tail_rcu(&handle->d_node, &dev->h_list); | |
2058 | ||
8006479c | 2059 | mutex_unlock(&dev->mutex); |
5b2a0826 | 2060 | |
8006479c DT |
2061 | /* |
2062 | * Since we are supposed to be called from ->connect() | |
2063 | * which is mutually exclusive with ->disconnect() | |
2064 | * we can't be racing with input_unregister_handle() | |
2065 | * and so separate lock is not needed here. | |
2066 | */ | |
66d2a595 | 2067 | list_add_tail_rcu(&handle->h_node, &handler->h_list); |
5b2a0826 DT |
2068 | |
2069 | if (handler->start) | |
2070 | handler->start(handle); | |
2071 | ||
2072 | return 0; | |
2073 | } | |
2074 | EXPORT_SYMBOL(input_register_handle); | |
2075 | ||
8006479c DT |
2076 | /** |
2077 | * input_unregister_handle - unregister an input handle | |
2078 | * @handle: handle to unregister | |
2079 | * | |
2080 | * This function removes input handle from device's | |
2081 | * and handler's lists. | |
2082 | * | |
2083 | * This function is supposed to be called from handler's | |
2084 | * disconnect() method. | |
2085 | */ | |
5b2a0826 DT |
2086 | void input_unregister_handle(struct input_handle *handle) |
2087 | { | |
8006479c DT |
2088 | struct input_dev *dev = handle->dev; |
2089 | ||
66d2a595 | 2090 | list_del_rcu(&handle->h_node); |
8006479c DT |
2091 | |
2092 | /* | |
2093 | * Take dev->mutex to prevent race with input_release_device(). | |
2094 | */ | |
2095 | mutex_lock(&dev->mutex); | |
2096 | list_del_rcu(&handle->d_node); | |
2097 | mutex_unlock(&dev->mutex); | |
66d2a595 | 2098 | |
82ba56c2 | 2099 | synchronize_rcu(); |
5b2a0826 DT |
2100 | } |
2101 | EXPORT_SYMBOL(input_unregister_handle); | |
2102 | ||
1da177e4 LT |
2103 | static int input_open_file(struct inode *inode, struct file *file) |
2104 | { | |
2edbf853 | 2105 | struct input_handler *handler; |
99ac48f5 | 2106 | const struct file_operations *old_fops, *new_fops = NULL; |
1da177e4 LT |
2107 | int err; |
2108 | ||
2f2177c8 AB |
2109 | err = mutex_lock_interruptible(&input_mutex); |
2110 | if (err) | |
2111 | return err; | |
2112 | ||
1da177e4 | 2113 | /* No load-on-demand here? */ |
2edbf853 | 2114 | handler = input_table[iminor(inode) >> 5]; |
2f2177c8 AB |
2115 | if (handler) |
2116 | new_fops = fops_get(handler->fops); | |
2117 | ||
2118 | mutex_unlock(&input_mutex); | |
1da177e4 LT |
2119 | |
2120 | /* | |
2121 | * That's _really_ odd. Usually NULL ->open means "nothing special", | |
2122 | * not "no device". Oh, well... | |
2123 | */ | |
2f2177c8 | 2124 | if (!new_fops || !new_fops->open) { |
1da177e4 | 2125 | fops_put(new_fops); |
2edbf853 JC |
2126 | err = -ENODEV; |
2127 | goto out; | |
1da177e4 | 2128 | } |
2f2177c8 | 2129 | |
1da177e4 LT |
2130 | old_fops = file->f_op; |
2131 | file->f_op = new_fops; | |
2132 | ||
2133 | err = new_fops->open(inode, file); | |
1da177e4 LT |
2134 | if (err) { |
2135 | fops_put(file->f_op); | |
2136 | file->f_op = fops_get(old_fops); | |
2137 | } | |
2138 | fops_put(old_fops); | |
2edbf853 | 2139 | out: |
1da177e4 LT |
2140 | return err; |
2141 | } | |
2142 | ||
2b8693c0 | 2143 | static const struct file_operations input_fops = { |
1da177e4 LT |
2144 | .owner = THIS_MODULE, |
2145 | .open = input_open_file, | |
6038f373 | 2146 | .llseek = noop_llseek, |
1da177e4 LT |
2147 | }; |
2148 | ||
f96b434d | 2149 | static int __init input_init(void) |
1da177e4 | 2150 | { |
f96b434d | 2151 | int err; |
1da177e4 | 2152 | |
ea9f240b | 2153 | err = class_register(&input_class); |
d19fbe8a | 2154 | if (err) { |
da0c4901 | 2155 | pr_err("unable to register input_dev class\n"); |
d19fbe8a DT |
2156 | return err; |
2157 | } | |
2158 | ||
f96b434d DT |
2159 | err = input_proc_init(); |
2160 | if (err) | |
b0fdfebb | 2161 | goto fail1; |
1da177e4 | 2162 | |
f96b434d DT |
2163 | err = register_chrdev(INPUT_MAJOR, "input", &input_fops); |
2164 | if (err) { | |
da0c4901 | 2165 | pr_err("unable to register char major %d", INPUT_MAJOR); |
b0fdfebb | 2166 | goto fail2; |
1da177e4 | 2167 | } |
e334016f | 2168 | |
1da177e4 | 2169 | return 0; |
1da177e4 | 2170 | |
b0fdfebb | 2171 | fail2: input_proc_exit(); |
ea9f240b | 2172 | fail1: class_unregister(&input_class); |
f96b434d | 2173 | return err; |
1da177e4 LT |
2174 | } |
2175 | ||
2176 | static void __exit input_exit(void) | |
2177 | { | |
f96b434d | 2178 | input_proc_exit(); |
1da177e4 | 2179 | unregister_chrdev(INPUT_MAJOR, "input"); |
ea9f240b | 2180 | class_unregister(&input_class); |
1da177e4 LT |
2181 | } |
2182 | ||
2183 | subsys_initcall(input_init); | |
2184 | module_exit(input_exit); |