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 | ||
13 | #include <linux/init.h> | |
ffd0db97 | 14 | #include <linux/types.h> |
47c78e89 | 15 | #include <linux/input/mt.h> |
1da177e4 | 16 | #include <linux/module.h> |
5a0e3ad6 | 17 | #include <linux/slab.h> |
1da177e4 LT |
18 | #include <linux/random.h> |
19 | #include <linux/major.h> | |
20 | #include <linux/proc_fs.h> | |
a99bbaf5 | 21 | #include <linux/sched.h> |
969b21cd | 22 | #include <linux/seq_file.h> |
1da177e4 LT |
23 | #include <linux/poll.h> |
24 | #include <linux/device.h> | |
e676c232 | 25 | #include <linux/mutex.h> |
8006479c | 26 | #include <linux/rcupdate.h> |
2edbf853 | 27 | #include <linux/smp_lock.h> |
15e184af | 28 | #include "input-compat.h" |
1da177e4 LT |
29 | |
30 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>"); | |
31 | MODULE_DESCRIPTION("Input core"); | |
32 | MODULE_LICENSE("GPL"); | |
33 | ||
1da177e4 LT |
34 | #define INPUT_DEVICES 256 |
35 | ||
36 | static LIST_HEAD(input_dev_list); | |
37 | static LIST_HEAD(input_handler_list); | |
38 | ||
8006479c DT |
39 | /* |
40 | * input_mutex protects access to both input_dev_list and input_handler_list. | |
41 | * This also causes input_[un]register_device and input_[un]register_handler | |
42 | * be mutually exclusive which simplifies locking in drivers implementing | |
43 | * input handlers. | |
44 | */ | |
45 | static DEFINE_MUTEX(input_mutex); | |
46 | ||
1da177e4 LT |
47 | static struct input_handler *input_table[8]; |
48 | ||
8006479c DT |
49 | static inline int is_event_supported(unsigned int code, |
50 | unsigned long *bm, unsigned int max) | |
1da177e4 | 51 | { |
8006479c DT |
52 | return code <= max && test_bit(code, bm); |
53 | } | |
1da177e4 | 54 | |
8006479c DT |
55 | static int input_defuzz_abs_event(int value, int old_val, int fuzz) |
56 | { | |
57 | if (fuzz) { | |
58 | if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2) | |
59 | return old_val; | |
1da177e4 | 60 | |
8006479c DT |
61 | if (value > old_val - fuzz && value < old_val + fuzz) |
62 | return (old_val * 3 + value) / 4; | |
1da177e4 | 63 | |
8006479c DT |
64 | if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2) |
65 | return (old_val + value) / 2; | |
66 | } | |
1da177e4 | 67 | |
8006479c DT |
68 | return value; |
69 | } | |
1da177e4 | 70 | |
8006479c | 71 | /* |
ef7995f4 DT |
72 | * Pass event first through all filters and then, if event has not been |
73 | * filtered out, through all open handles. This function is called with | |
82ba56c2 | 74 | * dev->event_lock held and interrupts disabled. |
8006479c DT |
75 | */ |
76 | static void input_pass_event(struct input_dev *dev, | |
77 | unsigned int type, unsigned int code, int value) | |
78 | { | |
ef7995f4 | 79 | struct input_handler *handler; |
82ba56c2 DT |
80 | struct input_handle *handle; |
81 | ||
82 | rcu_read_lock(); | |
1da177e4 | 83 | |
82ba56c2 | 84 | handle = rcu_dereference(dev->grab); |
8006479c DT |
85 | if (handle) |
86 | handle->handler->event(handle, type, code, value); | |
ef7995f4 DT |
87 | else { |
88 | bool filtered = false; | |
89 | ||
90 | list_for_each_entry_rcu(handle, &dev->h_list, d_node) { | |
91 | if (!handle->open) | |
92 | continue; | |
93 | ||
94 | handler = handle->handler; | |
95 | if (!handler->filter) { | |
96 | if (filtered) | |
97 | break; | |
98 | ||
99 | handler->event(handle, type, code, value); | |
100 | ||
101 | } else if (handler->filter(handle, type, code, value)) | |
102 | filtered = true; | |
103 | } | |
104 | } | |
105 | ||
82ba56c2 | 106 | rcu_read_unlock(); |
8006479c | 107 | } |
1da177e4 | 108 | |
8006479c DT |
109 | /* |
110 | * Generate software autorepeat event. Note that we take | |
111 | * dev->event_lock here to avoid racing with input_event | |
112 | * which may cause keys get "stuck". | |
113 | */ | |
114 | static void input_repeat_key(unsigned long data) | |
115 | { | |
116 | struct input_dev *dev = (void *) data; | |
117 | unsigned long flags; | |
1da177e4 | 118 | |
8006479c | 119 | spin_lock_irqsave(&dev->event_lock, flags); |
1da177e4 | 120 | |
8006479c DT |
121 | if (test_bit(dev->repeat_key, dev->key) && |
122 | is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) { | |
1da177e4 | 123 | |
8006479c | 124 | input_pass_event(dev, EV_KEY, dev->repeat_key, 2); |
1da177e4 | 125 | |
8006479c DT |
126 | if (dev->sync) { |
127 | /* | |
128 | * Only send SYN_REPORT if we are not in a middle | |
129 | * of driver parsing a new hardware packet. | |
130 | * Otherwise assume that the driver will send | |
131 | * SYN_REPORT once it's done. | |
132 | */ | |
133 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
134 | } | |
31581066 | 135 | |
8006479c DT |
136 | if (dev->rep[REP_PERIOD]) |
137 | mod_timer(&dev->timer, jiffies + | |
138 | msecs_to_jiffies(dev->rep[REP_PERIOD])); | |
139 | } | |
31581066 | 140 | |
8006479c DT |
141 | spin_unlock_irqrestore(&dev->event_lock, flags); |
142 | } | |
31581066 | 143 | |
8006479c DT |
144 | static void input_start_autorepeat(struct input_dev *dev, int code) |
145 | { | |
146 | if (test_bit(EV_REP, dev->evbit) && | |
147 | dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && | |
148 | dev->timer.data) { | |
149 | dev->repeat_key = code; | |
150 | mod_timer(&dev->timer, | |
151 | jiffies + msecs_to_jiffies(dev->rep[REP_DELAY])); | |
152 | } | |
153 | } | |
31581066 | 154 | |
e7b5c1ef JB |
155 | static void input_stop_autorepeat(struct input_dev *dev) |
156 | { | |
157 | del_timer(&dev->timer); | |
158 | } | |
159 | ||
8006479c DT |
160 | #define INPUT_IGNORE_EVENT 0 |
161 | #define INPUT_PASS_TO_HANDLERS 1 | |
162 | #define INPUT_PASS_TO_DEVICE 2 | |
163 | #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE) | |
1da177e4 | 164 | |
40d007e7 HR |
165 | static int input_handle_abs_event(struct input_dev *dev, |
166 | unsigned int code, int *pval) | |
167 | { | |
168 | bool is_mt_event; | |
169 | int *pold; | |
170 | ||
171 | if (code == ABS_MT_SLOT) { | |
172 | /* | |
173 | * "Stage" the event; we'll flush it later, when we | |
144c0f88 | 174 | * get actual touch data. |
40d007e7 HR |
175 | */ |
176 | if (*pval >= 0 && *pval < dev->mtsize) | |
177 | dev->slot = *pval; | |
178 | ||
179 | return INPUT_IGNORE_EVENT; | |
180 | } | |
181 | ||
182 | is_mt_event = code >= ABS_MT_FIRST && code <= ABS_MT_LAST; | |
183 | ||
184 | if (!is_mt_event) { | |
d31b2865 | 185 | pold = &dev->absinfo[code].value; |
40d007e7 HR |
186 | } else if (dev->mt) { |
187 | struct input_mt_slot *mtslot = &dev->mt[dev->slot]; | |
188 | pold = &mtslot->abs[code - ABS_MT_FIRST]; | |
189 | } else { | |
190 | /* | |
144c0f88 | 191 | * Bypass filtering for multi-touch events when |
40d007e7 HR |
192 | * not employing slots. |
193 | */ | |
194 | pold = NULL; | |
195 | } | |
196 | ||
197 | if (pold) { | |
198 | *pval = input_defuzz_abs_event(*pval, *pold, | |
d31b2865 | 199 | dev->absinfo[code].fuzz); |
40d007e7 HR |
200 | if (*pold == *pval) |
201 | return INPUT_IGNORE_EVENT; | |
202 | ||
203 | *pold = *pval; | |
204 | } | |
205 | ||
206 | /* Flush pending "slot" event */ | |
987a6c02 DM |
207 | if (is_mt_event && dev->slot != input_abs_get_val(dev, ABS_MT_SLOT)) { |
208 | input_abs_set_val(dev, ABS_MT_SLOT, dev->slot); | |
40d007e7 HR |
209 | input_pass_event(dev, EV_ABS, ABS_MT_SLOT, dev->slot); |
210 | } | |
211 | ||
212 | return INPUT_PASS_TO_HANDLERS; | |
213 | } | |
214 | ||
8006479c DT |
215 | static void input_handle_event(struct input_dev *dev, |
216 | unsigned int type, unsigned int code, int value) | |
217 | { | |
218 | int disposition = INPUT_IGNORE_EVENT; | |
1da177e4 | 219 | |
8006479c | 220 | switch (type) { |
1da177e4 | 221 | |
8006479c DT |
222 | case EV_SYN: |
223 | switch (code) { | |
224 | case SYN_CONFIG: | |
225 | disposition = INPUT_PASS_TO_ALL; | |
226 | break; | |
1da177e4 | 227 | |
8006479c DT |
228 | case SYN_REPORT: |
229 | if (!dev->sync) { | |
20da92de | 230 | dev->sync = true; |
8006479c | 231 | disposition = INPUT_PASS_TO_HANDLERS; |
1da177e4 | 232 | } |
1da177e4 | 233 | break; |
5e5ee686 | 234 | case SYN_MT_REPORT: |
20da92de | 235 | dev->sync = false; |
5e5ee686 HR |
236 | disposition = INPUT_PASS_TO_HANDLERS; |
237 | break; | |
8006479c DT |
238 | } |
239 | break; | |
1da177e4 | 240 | |
8006479c DT |
241 | case EV_KEY: |
242 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
243 | !!test_bit(code, dev->key) != value) { | |
1da177e4 | 244 | |
8006479c DT |
245 | if (value != 2) { |
246 | __change_bit(code, dev->key); | |
247 | if (value) | |
248 | input_start_autorepeat(dev, code); | |
e7b5c1ef JB |
249 | else |
250 | input_stop_autorepeat(dev); | |
8006479c | 251 | } |
1da177e4 | 252 | |
8006479c DT |
253 | disposition = INPUT_PASS_TO_HANDLERS; |
254 | } | |
255 | break; | |
1da177e4 | 256 | |
8006479c DT |
257 | case EV_SW: |
258 | if (is_event_supported(code, dev->swbit, SW_MAX) && | |
259 | !!test_bit(code, dev->sw) != value) { | |
1da177e4 | 260 | |
8006479c DT |
261 | __change_bit(code, dev->sw); |
262 | disposition = INPUT_PASS_TO_HANDLERS; | |
263 | } | |
264 | break; | |
1da177e4 | 265 | |
8006479c | 266 | case EV_ABS: |
40d007e7 HR |
267 | if (is_event_supported(code, dev->absbit, ABS_MAX)) |
268 | disposition = input_handle_abs_event(dev, code, &value); | |
61994a61 | 269 | |
8006479c | 270 | break; |
1da177e4 | 271 | |
8006479c DT |
272 | case EV_REL: |
273 | if (is_event_supported(code, dev->relbit, REL_MAX) && value) | |
274 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 275 | |
8006479c | 276 | break; |
1e0afb28 | 277 | |
8006479c DT |
278 | case EV_MSC: |
279 | if (is_event_supported(code, dev->mscbit, MSC_MAX)) | |
280 | disposition = INPUT_PASS_TO_ALL; | |
1da177e4 | 281 | |
8006479c | 282 | break; |
1da177e4 | 283 | |
8006479c DT |
284 | case EV_LED: |
285 | if (is_event_supported(code, dev->ledbit, LED_MAX) && | |
286 | !!test_bit(code, dev->led) != value) { | |
1da177e4 | 287 | |
8006479c DT |
288 | __change_bit(code, dev->led); |
289 | disposition = INPUT_PASS_TO_ALL; | |
290 | } | |
291 | break; | |
292 | ||
293 | case EV_SND: | |
294 | if (is_event_supported(code, dev->sndbit, SND_MAX)) { | |
1da177e4 | 295 | |
8fdc1948 | 296 | if (!!test_bit(code, dev->snd) != !!value) |
8006479c DT |
297 | __change_bit(code, dev->snd); |
298 | disposition = INPUT_PASS_TO_ALL; | |
299 | } | |
300 | break; | |
8fdc1948 | 301 | |
8006479c DT |
302 | case EV_REP: |
303 | if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) { | |
304 | dev->rep[code] = value; | |
305 | disposition = INPUT_PASS_TO_ALL; | |
306 | } | |
307 | break; | |
1da177e4 | 308 | |
8006479c DT |
309 | case EV_FF: |
310 | if (value >= 0) | |
311 | disposition = INPUT_PASS_TO_ALL; | |
312 | break; | |
ed2fa4dd RP |
313 | |
314 | case EV_PWR: | |
315 | disposition = INPUT_PASS_TO_ALL; | |
316 | break; | |
8006479c | 317 | } |
1da177e4 | 318 | |
c9812282 | 319 | if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN) |
20da92de | 320 | dev->sync = false; |
1da177e4 | 321 | |
8006479c DT |
322 | if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event) |
323 | dev->event(dev, type, code, value); | |
1da177e4 | 324 | |
8006479c DT |
325 | if (disposition & INPUT_PASS_TO_HANDLERS) |
326 | input_pass_event(dev, type, code, value); | |
327 | } | |
1da177e4 | 328 | |
8006479c DT |
329 | /** |
330 | * input_event() - report new input event | |
331 | * @dev: device that generated the event | |
332 | * @type: type of the event | |
333 | * @code: event code | |
334 | * @value: value of the event | |
335 | * | |
336 | * This function should be used by drivers implementing various input | |
df2d4637 DT |
337 | * devices to report input events. See also input_inject_event(). |
338 | * | |
339 | * NOTE: input_event() may be safely used right after input device was | |
340 | * allocated with input_allocate_device(), even before it is registered | |
341 | * with input_register_device(), but the event will not reach any of the | |
342 | * input handlers. Such early invocation of input_event() may be used | |
343 | * to 'seed' initial state of a switch or initial position of absolute | |
344 | * axis, etc. | |
8006479c | 345 | */ |
8006479c DT |
346 | void input_event(struct input_dev *dev, |
347 | unsigned int type, unsigned int code, int value) | |
348 | { | |
349 | unsigned long flags; | |
509ca1a9 | 350 | |
8006479c | 351 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
509ca1a9 | 352 | |
8006479c DT |
353 | spin_lock_irqsave(&dev->event_lock, flags); |
354 | add_input_randomness(type, code, value); | |
355 | input_handle_event(dev, type, code, value); | |
356 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1da177e4 | 357 | } |
1da177e4 | 358 | } |
ca56fe07 | 359 | EXPORT_SYMBOL(input_event); |
1da177e4 | 360 | |
0e739d28 DT |
361 | /** |
362 | * input_inject_event() - send input event from input handler | |
363 | * @handle: input handle to send event through | |
364 | * @type: type of the event | |
365 | * @code: event code | |
366 | * @value: value of the event | |
367 | * | |
8006479c DT |
368 | * Similar to input_event() but will ignore event if device is |
369 | * "grabbed" and handle injecting event is not the one that owns | |
370 | * the device. | |
0e739d28 | 371 | */ |
8006479c DT |
372 | void input_inject_event(struct input_handle *handle, |
373 | unsigned int type, unsigned int code, int value) | |
1da177e4 | 374 | { |
8006479c DT |
375 | struct input_dev *dev = handle->dev; |
376 | struct input_handle *grab; | |
377 | unsigned long flags; | |
1da177e4 | 378 | |
8006479c DT |
379 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
380 | spin_lock_irqsave(&dev->event_lock, flags); | |
1da177e4 | 381 | |
82ba56c2 | 382 | rcu_read_lock(); |
8006479c DT |
383 | grab = rcu_dereference(dev->grab); |
384 | if (!grab || grab == handle) | |
385 | input_handle_event(dev, type, code, value); | |
82ba56c2 | 386 | rcu_read_unlock(); |
1da177e4 | 387 | |
8006479c DT |
388 | spin_unlock_irqrestore(&dev->event_lock, flags); |
389 | } | |
1da177e4 | 390 | } |
8006479c | 391 | EXPORT_SYMBOL(input_inject_event); |
1da177e4 | 392 | |
d31b2865 DM |
393 | /** |
394 | * input_alloc_absinfo - allocates array of input_absinfo structs | |
395 | * @dev: the input device emitting absolute events | |
396 | * | |
397 | * If the absinfo struct the caller asked for is already allocated, this | |
398 | * functions will not do anything. | |
399 | */ | |
400 | void input_alloc_absinfo(struct input_dev *dev) | |
401 | { | |
402 | if (!dev->absinfo) | |
403 | dev->absinfo = kcalloc(ABS_CNT, sizeof(struct input_absinfo), | |
404 | GFP_KERNEL); | |
405 | ||
406 | WARN(!dev->absinfo, "%s(): kcalloc() failed?\n", __func__); | |
407 | } | |
408 | EXPORT_SYMBOL(input_alloc_absinfo); | |
409 | ||
410 | void input_set_abs_params(struct input_dev *dev, unsigned int axis, | |
411 | int min, int max, int fuzz, int flat) | |
412 | { | |
413 | struct input_absinfo *absinfo; | |
414 | ||
415 | input_alloc_absinfo(dev); | |
416 | if (!dev->absinfo) | |
417 | return; | |
418 | ||
419 | absinfo = &dev->absinfo[axis]; | |
420 | absinfo->minimum = min; | |
421 | absinfo->maximum = max; | |
422 | absinfo->fuzz = fuzz; | |
423 | absinfo->flat = flat; | |
424 | ||
425 | dev->absbit[BIT_WORD(axis)] |= BIT_MASK(axis); | |
426 | } | |
427 | EXPORT_SYMBOL(input_set_abs_params); | |
428 | ||
429 | ||
8006479c DT |
430 | /** |
431 | * input_grab_device - grabs device for exclusive use | |
432 | * @handle: input handle that wants to own the device | |
433 | * | |
434 | * When a device is grabbed by an input handle all events generated by | |
435 | * the device are delivered only to this handle. Also events injected | |
436 | * by other input handles are ignored while device is grabbed. | |
437 | */ | |
1da177e4 LT |
438 | int input_grab_device(struct input_handle *handle) |
439 | { | |
8006479c DT |
440 | struct input_dev *dev = handle->dev; |
441 | int retval; | |
1da177e4 | 442 | |
8006479c DT |
443 | retval = mutex_lock_interruptible(&dev->mutex); |
444 | if (retval) | |
445 | return retval; | |
446 | ||
447 | if (dev->grab) { | |
448 | retval = -EBUSY; | |
449 | goto out; | |
450 | } | |
451 | ||
452 | rcu_assign_pointer(dev->grab, handle); | |
82ba56c2 | 453 | synchronize_rcu(); |
8006479c DT |
454 | |
455 | out: | |
456 | mutex_unlock(&dev->mutex); | |
457 | return retval; | |
1da177e4 | 458 | } |
ca56fe07 | 459 | EXPORT_SYMBOL(input_grab_device); |
1da177e4 | 460 | |
8006479c | 461 | static void __input_release_device(struct input_handle *handle) |
1da177e4 | 462 | { |
a2b2ed2c | 463 | struct input_dev *dev = handle->dev; |
c7e8dc6e | 464 | |
a2b2ed2c | 465 | if (dev->grab == handle) { |
8006479c DT |
466 | rcu_assign_pointer(dev->grab, NULL); |
467 | /* Make sure input_pass_event() notices that grab is gone */ | |
82ba56c2 | 468 | synchronize_rcu(); |
a2b2ed2c AM |
469 | |
470 | list_for_each_entry(handle, &dev->h_list, d_node) | |
8006479c | 471 | if (handle->open && handle->handler->start) |
c7e8dc6e DT |
472 | handle->handler->start(handle); |
473 | } | |
1da177e4 | 474 | } |
8006479c DT |
475 | |
476 | /** | |
477 | * input_release_device - release previously grabbed device | |
478 | * @handle: input handle that owns the device | |
479 | * | |
480 | * Releases previously grabbed device so that other input handles can | |
481 | * start receiving input events. Upon release all handlers attached | |
482 | * to the device have their start() method called so they have a change | |
483 | * to synchronize device state with the rest of the system. | |
484 | */ | |
485 | void input_release_device(struct input_handle *handle) | |
486 | { | |
487 | struct input_dev *dev = handle->dev; | |
488 | ||
489 | mutex_lock(&dev->mutex); | |
490 | __input_release_device(handle); | |
491 | mutex_unlock(&dev->mutex); | |
492 | } | |
ca56fe07 | 493 | EXPORT_SYMBOL(input_release_device); |
1da177e4 | 494 | |
8006479c DT |
495 | /** |
496 | * input_open_device - open input device | |
497 | * @handle: handle through which device is being accessed | |
498 | * | |
499 | * This function should be called by input handlers when they | |
500 | * want to start receive events from given input device. | |
501 | */ | |
1da177e4 LT |
502 | int input_open_device(struct input_handle *handle) |
503 | { | |
0fbf87ca | 504 | struct input_dev *dev = handle->dev; |
8006479c | 505 | int retval; |
0fbf87ca | 506 | |
8006479c DT |
507 | retval = mutex_lock_interruptible(&dev->mutex); |
508 | if (retval) | |
509 | return retval; | |
510 | ||
511 | if (dev->going_away) { | |
512 | retval = -ENODEV; | |
513 | goto out; | |
514 | } | |
0fbf87ca | 515 | |
1da177e4 | 516 | handle->open++; |
0fbf87ca DT |
517 | |
518 | if (!dev->users++ && dev->open) | |
8006479c DT |
519 | retval = dev->open(dev); |
520 | ||
521 | if (retval) { | |
522 | dev->users--; | |
523 | if (!--handle->open) { | |
524 | /* | |
525 | * Make sure we are not delivering any more events | |
526 | * through this handle | |
527 | */ | |
82ba56c2 | 528 | synchronize_rcu(); |
8006479c DT |
529 | } |
530 | } | |
0fbf87ca | 531 | |
8006479c | 532 | out: |
e676c232 | 533 | mutex_unlock(&dev->mutex); |
8006479c | 534 | return retval; |
1da177e4 | 535 | } |
ca56fe07 | 536 | EXPORT_SYMBOL(input_open_device); |
1da177e4 | 537 | |
8006479c | 538 | int input_flush_device(struct input_handle *handle, struct file *file) |
1da177e4 | 539 | { |
8006479c DT |
540 | struct input_dev *dev = handle->dev; |
541 | int retval; | |
1da177e4 | 542 | |
8006479c DT |
543 | retval = mutex_lock_interruptible(&dev->mutex); |
544 | if (retval) | |
545 | return retval; | |
546 | ||
547 | if (dev->flush) | |
548 | retval = dev->flush(dev, file); | |
549 | ||
550 | mutex_unlock(&dev->mutex); | |
551 | return retval; | |
1da177e4 | 552 | } |
ca56fe07 | 553 | EXPORT_SYMBOL(input_flush_device); |
1da177e4 | 554 | |
8006479c DT |
555 | /** |
556 | * input_close_device - close input device | |
557 | * @handle: handle through which device is being accessed | |
558 | * | |
559 | * This function should be called by input handlers when they | |
560 | * want to stop receive events from given input device. | |
561 | */ | |
1da177e4 LT |
562 | void input_close_device(struct input_handle *handle) |
563 | { | |
0fbf87ca DT |
564 | struct input_dev *dev = handle->dev; |
565 | ||
e676c232 | 566 | mutex_lock(&dev->mutex); |
0fbf87ca | 567 | |
8006479c DT |
568 | __input_release_device(handle); |
569 | ||
0fbf87ca DT |
570 | if (!--dev->users && dev->close) |
571 | dev->close(dev); | |
8006479c DT |
572 | |
573 | if (!--handle->open) { | |
574 | /* | |
82ba56c2 | 575 | * synchronize_rcu() makes sure that input_pass_event() |
8006479c DT |
576 | * completed and that no more input events are delivered |
577 | * through this handle | |
578 | */ | |
82ba56c2 | 579 | synchronize_rcu(); |
8006479c | 580 | } |
0fbf87ca | 581 | |
e676c232 | 582 | mutex_unlock(&dev->mutex); |
1da177e4 | 583 | } |
ca56fe07 | 584 | EXPORT_SYMBOL(input_close_device); |
1da177e4 | 585 | |
866d7d7b ON |
586 | /* |
587 | * Simulate keyup events for all keys that are marked as pressed. | |
588 | * The function must be called with dev->event_lock held. | |
589 | */ | |
590 | static void input_dev_release_keys(struct input_dev *dev) | |
591 | { | |
592 | int code; | |
593 | ||
594 | if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) { | |
595 | for (code = 0; code <= KEY_MAX; code++) { | |
596 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
597 | __test_and_clear_bit(code, dev->key)) { | |
598 | input_pass_event(dev, EV_KEY, code, 0); | |
599 | } | |
600 | } | |
601 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
602 | } | |
603 | } | |
604 | ||
8006479c DT |
605 | /* |
606 | * Prepare device for unregistering | |
607 | */ | |
608 | static void input_disconnect_device(struct input_dev *dev) | |
609 | { | |
610 | struct input_handle *handle; | |
8006479c DT |
611 | |
612 | /* | |
613 | * Mark device as going away. Note that we take dev->mutex here | |
614 | * not to protect access to dev->going_away but rather to ensure | |
615 | * that there are no threads in the middle of input_open_device() | |
616 | */ | |
617 | mutex_lock(&dev->mutex); | |
ffd0db97 | 618 | dev->going_away = true; |
8006479c DT |
619 | mutex_unlock(&dev->mutex); |
620 | ||
621 | spin_lock_irq(&dev->event_lock); | |
622 | ||
623 | /* | |
624 | * Simulate keyup events for all pressed keys so that handlers | |
625 | * are not left with "stuck" keys. The driver may continue | |
626 | * generate events even after we done here but they will not | |
627 | * reach any handlers. | |
628 | */ | |
866d7d7b | 629 | input_dev_release_keys(dev); |
8006479c DT |
630 | |
631 | list_for_each_entry(handle, &dev->h_list, d_node) | |
632 | handle->open = 0; | |
633 | ||
634 | spin_unlock_irq(&dev->event_lock); | |
635 | } | |
636 | ||
8613e4c2 MCC |
637 | /** |
638 | * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry | |
639 | * @ke: keymap entry containing scancode to be converted. | |
640 | * @scancode: pointer to the location where converted scancode should | |
641 | * be stored. | |
642 | * | |
643 | * This function is used to convert scancode stored in &struct keymap_entry | |
644 | * into scalar form understood by legacy keymap handling methods. These | |
645 | * methods expect scancodes to be represented as 'unsigned int'. | |
646 | */ | |
647 | int input_scancode_to_scalar(const struct input_keymap_entry *ke, | |
648 | unsigned int *scancode) | |
649 | { | |
650 | switch (ke->len) { | |
651 | case 1: | |
652 | *scancode = *((u8 *)ke->scancode); | |
653 | break; | |
654 | ||
655 | case 2: | |
656 | *scancode = *((u16 *)ke->scancode); | |
657 | break; | |
658 | ||
659 | case 4: | |
660 | *scancode = *((u32 *)ke->scancode); | |
661 | break; | |
662 | ||
663 | default: | |
664 | return -EINVAL; | |
665 | } | |
666 | ||
667 | return 0; | |
668 | } | |
669 | EXPORT_SYMBOL(input_scancode_to_scalar); | |
670 | ||
671 | /* | |
672 | * Those routines handle the default case where no [gs]etkeycode() is | |
673 | * defined. In this case, an array indexed by the scancode is used. | |
674 | */ | |
675 | ||
676 | static unsigned int input_fetch_keycode(struct input_dev *dev, | |
677 | unsigned int index) | |
c8e4c772 MR |
678 | { |
679 | switch (dev->keycodesize) { | |
8613e4c2 MCC |
680 | case 1: |
681 | return ((u8 *)dev->keycode)[index]; | |
c8e4c772 | 682 | |
8613e4c2 MCC |
683 | case 2: |
684 | return ((u16 *)dev->keycode)[index]; | |
c8e4c772 | 685 | |
8613e4c2 MCC |
686 | default: |
687 | return ((u32 *)dev->keycode)[index]; | |
c8e4c772 MR |
688 | } |
689 | } | |
690 | ||
691 | static int input_default_getkeycode(struct input_dev *dev, | |
8613e4c2 | 692 | struct input_keymap_entry *ke) |
c8e4c772 | 693 | { |
8613e4c2 MCC |
694 | unsigned int index; |
695 | int error; | |
696 | ||
c8e4c772 MR |
697 | if (!dev->keycodesize) |
698 | return -EINVAL; | |
699 | ||
8613e4c2 MCC |
700 | if (ke->flags & INPUT_KEYMAP_BY_INDEX) |
701 | index = ke->index; | |
702 | else { | |
703 | error = input_scancode_to_scalar(ke, &index); | |
704 | if (error) | |
705 | return error; | |
706 | } | |
707 | ||
708 | if (index >= dev->keycodemax) | |
c8e4c772 MR |
709 | return -EINVAL; |
710 | ||
8613e4c2 MCC |
711 | ke->keycode = input_fetch_keycode(dev, index); |
712 | ke->index = index; | |
713 | ke->len = sizeof(index); | |
714 | memcpy(ke->scancode, &index, sizeof(index)); | |
c8e4c772 MR |
715 | |
716 | return 0; | |
717 | } | |
718 | ||
719 | static int input_default_setkeycode(struct input_dev *dev, | |
8613e4c2 MCC |
720 | const struct input_keymap_entry *ke, |
721 | unsigned int *old_keycode) | |
c8e4c772 | 722 | { |
8613e4c2 MCC |
723 | unsigned int index; |
724 | int error; | |
c8e4c772 MR |
725 | int i; |
726 | ||
8613e4c2 | 727 | if (!dev->keycodesize) |
c8e4c772 MR |
728 | return -EINVAL; |
729 | ||
8613e4c2 MCC |
730 | if (ke->flags & INPUT_KEYMAP_BY_INDEX) { |
731 | index = ke->index; | |
732 | } else { | |
733 | error = input_scancode_to_scalar(ke, &index); | |
734 | if (error) | |
735 | return error; | |
736 | } | |
737 | ||
738 | if (index >= dev->keycodemax) | |
c8e4c772 MR |
739 | return -EINVAL; |
740 | ||
8613e4c2 MCC |
741 | if (dev->keycodesize < sizeof(dev->keycode) && |
742 | (ke->keycode >> (dev->keycodesize * 8))) | |
c8e4c772 MR |
743 | return -EINVAL; |
744 | ||
745 | switch (dev->keycodesize) { | |
746 | case 1: { | |
747 | u8 *k = (u8 *)dev->keycode; | |
8613e4c2 MCC |
748 | *old_keycode = k[index]; |
749 | k[index] = ke->keycode; | |
c8e4c772 MR |
750 | break; |
751 | } | |
752 | case 2: { | |
753 | u16 *k = (u16 *)dev->keycode; | |
8613e4c2 MCC |
754 | *old_keycode = k[index]; |
755 | k[index] = ke->keycode; | |
c8e4c772 MR |
756 | break; |
757 | } | |
758 | default: { | |
759 | u32 *k = (u32 *)dev->keycode; | |
8613e4c2 MCC |
760 | *old_keycode = k[index]; |
761 | k[index] = ke->keycode; | |
c8e4c772 MR |
762 | break; |
763 | } | |
764 | } | |
765 | ||
8613e4c2 MCC |
766 | __clear_bit(*old_keycode, dev->keybit); |
767 | __set_bit(ke->keycode, dev->keybit); | |
c8e4c772 MR |
768 | |
769 | for (i = 0; i < dev->keycodemax; i++) { | |
8613e4c2 MCC |
770 | if (input_fetch_keycode(dev, i) == *old_keycode) { |
771 | __set_bit(*old_keycode, dev->keybit); | |
c8e4c772 MR |
772 | break; /* Setting the bit twice is useless, so break */ |
773 | } | |
774 | } | |
775 | ||
776 | return 0; | |
777 | } | |
778 | ||
f4f37c8e DT |
779 | /** |
780 | * input_get_keycode - retrieve keycode currently mapped to a given scancode | |
781 | * @dev: input device which keymap is being queried | |
8613e4c2 | 782 | * @ke: keymap entry |
f4f37c8e DT |
783 | * |
784 | * This function should be called by anyone interested in retrieving current | |
8613e4c2 | 785 | * keymap. Presently evdev handlers use it. |
f4f37c8e | 786 | */ |
8613e4c2 | 787 | int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke) |
f4f37c8e | 788 | { |
2e2e3b96 DT |
789 | unsigned long flags; |
790 | int retval; | |
791 | ||
792 | spin_lock_irqsave(&dev->event_lock, flags); | |
2e2e3b96 | 793 | |
8613e4c2 MCC |
794 | if (dev->getkeycode) { |
795 | /* | |
796 | * Support for legacy drivers, that don't implement the new | |
797 | * ioctls | |
798 | */ | |
799 | u32 scancode = ke->index; | |
800 | ||
801 | memcpy(ke->scancode, &scancode, sizeof(scancode)); | |
802 | ke->len = sizeof(scancode); | |
803 | retval = dev->getkeycode(dev, scancode, &ke->keycode); | |
804 | } else { | |
805 | retval = dev->getkeycode_new(dev, ke); | |
806 | } | |
807 | ||
808 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
2e2e3b96 | 809 | return retval; |
f4f37c8e DT |
810 | } |
811 | EXPORT_SYMBOL(input_get_keycode); | |
812 | ||
813 | /** | |
8613e4c2 | 814 | * input_set_keycode - attribute a keycode to a given scancode |
f4f37c8e | 815 | * @dev: input device which keymap is being updated |
8613e4c2 | 816 | * @ke: new keymap entry |
f4f37c8e DT |
817 | * |
818 | * This function should be called by anyone needing to update current | |
819 | * keymap. Presently keyboard and evdev handlers use it. | |
820 | */ | |
58b93995 | 821 | int input_set_keycode(struct input_dev *dev, |
8613e4c2 | 822 | const struct input_keymap_entry *ke) |
f4f37c8e DT |
823 | { |
824 | unsigned long flags; | |
fd6cf3dd | 825 | unsigned int old_keycode; |
f4f37c8e DT |
826 | int retval; |
827 | ||
8613e4c2 | 828 | if (ke->keycode > KEY_MAX) |
f4f37c8e DT |
829 | return -EINVAL; |
830 | ||
831 | spin_lock_irqsave(&dev->event_lock, flags); | |
832 | ||
8613e4c2 MCC |
833 | if (dev->setkeycode) { |
834 | /* | |
835 | * Support for legacy drivers, that don't implement the new | |
836 | * ioctls | |
837 | */ | |
838 | unsigned int scancode; | |
839 | ||
840 | retval = input_scancode_to_scalar(ke, &scancode); | |
841 | if (retval) | |
842 | goto out; | |
843 | ||
844 | /* | |
845 | * We need to know the old scancode, in order to generate a | |
846 | * keyup effect, if the set operation happens successfully | |
847 | */ | |
848 | if (!dev->getkeycode) { | |
849 | retval = -EINVAL; | |
850 | goto out; | |
851 | } | |
852 | ||
853 | retval = dev->getkeycode(dev, scancode, &old_keycode); | |
854 | if (retval) | |
855 | goto out; | |
856 | ||
857 | retval = dev->setkeycode(dev, scancode, ke->keycode); | |
858 | } else { | |
859 | retval = dev->setkeycode_new(dev, ke, &old_keycode); | |
860 | } | |
f4f37c8e | 861 | |
f4f37c8e DT |
862 | if (retval) |
863 | goto out; | |
864 | ||
4f93df40 DT |
865 | /* Make sure KEY_RESERVED did not get enabled. */ |
866 | __clear_bit(KEY_RESERVED, dev->keybit); | |
867 | ||
f4f37c8e DT |
868 | /* |
869 | * Simulate keyup event if keycode is not present | |
870 | * in the keymap anymore | |
871 | */ | |
872 | if (test_bit(EV_KEY, dev->evbit) && | |
873 | !is_event_supported(old_keycode, dev->keybit, KEY_MAX) && | |
874 | __test_and_clear_bit(old_keycode, dev->key)) { | |
875 | ||
876 | input_pass_event(dev, EV_KEY, old_keycode, 0); | |
877 | if (dev->sync) | |
878 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
879 | } | |
880 | ||
881 | out: | |
882 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
883 | ||
884 | return retval; | |
885 | } | |
886 | EXPORT_SYMBOL(input_set_keycode); | |
c8e4c772 | 887 | |
1da177e4 | 888 | #define MATCH_BIT(bit, max) \ |
7b19ada2 | 889 | for (i = 0; i < BITS_TO_LONGS(max); i++) \ |
1da177e4 LT |
890 | if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \ |
891 | break; \ | |
7b19ada2 | 892 | if (i != BITS_TO_LONGS(max)) \ |
1da177e4 LT |
893 | continue; |
894 | ||
0b7024ac | 895 | static const struct input_device_id *input_match_device(struct input_handler *handler, |
66e66118 | 896 | struct input_dev *dev) |
1da177e4 | 897 | { |
0b7024ac | 898 | const struct input_device_id *id; |
1da177e4 LT |
899 | int i; |
900 | ||
0b7024ac | 901 | for (id = handler->id_table; id->flags || id->driver_info; id++) { |
1da177e4 LT |
902 | |
903 | if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) | |
ddc5d341 | 904 | if (id->bustype != dev->id.bustype) |
1da177e4 LT |
905 | continue; |
906 | ||
907 | if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) | |
ddc5d341 | 908 | if (id->vendor != dev->id.vendor) |
1da177e4 LT |
909 | continue; |
910 | ||
911 | if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) | |
ddc5d341 | 912 | if (id->product != dev->id.product) |
1da177e4 LT |
913 | continue; |
914 | ||
915 | if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) | |
ddc5d341 | 916 | if (id->version != dev->id.version) |
1da177e4 LT |
917 | continue; |
918 | ||
919 | MATCH_BIT(evbit, EV_MAX); | |
920 | MATCH_BIT(keybit, KEY_MAX); | |
921 | MATCH_BIT(relbit, REL_MAX); | |
922 | MATCH_BIT(absbit, ABS_MAX); | |
923 | MATCH_BIT(mscbit, MSC_MAX); | |
924 | MATCH_BIT(ledbit, LED_MAX); | |
925 | MATCH_BIT(sndbit, SND_MAX); | |
926 | MATCH_BIT(ffbit, FF_MAX); | |
ff13f98b | 927 | MATCH_BIT(swbit, SW_MAX); |
1da177e4 | 928 | |
0b7024ac DT |
929 | if (!handler->match || handler->match(handler, dev)) |
930 | return id; | |
1da177e4 LT |
931 | } |
932 | ||
933 | return NULL; | |
934 | } | |
935 | ||
5b2a0826 DT |
936 | static int input_attach_handler(struct input_dev *dev, struct input_handler *handler) |
937 | { | |
938 | const struct input_device_id *id; | |
939 | int error; | |
940 | ||
0b7024ac | 941 | id = input_match_device(handler, dev); |
5b2a0826 DT |
942 | if (!id) |
943 | return -ENODEV; | |
944 | ||
945 | error = handler->connect(handler, dev, id); | |
946 | if (error && error != -ENODEV) | |
947 | printk(KERN_ERR | |
948 | "input: failed to attach handler %s to device %s, " | |
949 | "error: %d\n", | |
9657d75c | 950 | handler->name, kobject_name(&dev->dev.kobj), error); |
5b2a0826 DT |
951 | |
952 | return error; | |
953 | } | |
954 | ||
15e184af DT |
955 | #ifdef CONFIG_COMPAT |
956 | ||
957 | static int input_bits_to_string(char *buf, int buf_size, | |
958 | unsigned long bits, bool skip_empty) | |
959 | { | |
960 | int len = 0; | |
961 | ||
962 | if (INPUT_COMPAT_TEST) { | |
963 | u32 dword = bits >> 32; | |
964 | if (dword || !skip_empty) | |
965 | len += snprintf(buf, buf_size, "%x ", dword); | |
966 | ||
967 | dword = bits & 0xffffffffUL; | |
968 | if (dword || !skip_empty || len) | |
969 | len += snprintf(buf + len, max(buf_size - len, 0), | |
970 | "%x", dword); | |
971 | } else { | |
972 | if (bits || !skip_empty) | |
973 | len += snprintf(buf, buf_size, "%lx", bits); | |
974 | } | |
975 | ||
976 | return len; | |
977 | } | |
978 | ||
979 | #else /* !CONFIG_COMPAT */ | |
980 | ||
981 | static int input_bits_to_string(char *buf, int buf_size, | |
982 | unsigned long bits, bool skip_empty) | |
983 | { | |
984 | return bits || !skip_empty ? | |
985 | snprintf(buf, buf_size, "%lx", bits) : 0; | |
986 | } | |
987 | ||
988 | #endif | |
5b2a0826 | 989 | |
f96b434d DT |
990 | #ifdef CONFIG_PROC_FS |
991 | ||
992 | static struct proc_dir_entry *proc_bus_input_dir; | |
993 | static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); | |
994 | static int input_devices_state; | |
995 | ||
996 | static inline void input_wakeup_procfs_readers(void) | |
997 | { | |
998 | input_devices_state++; | |
999 | wake_up(&input_devices_poll_wait); | |
1000 | } | |
1001 | ||
969b21cd | 1002 | static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait) |
f96b434d | 1003 | { |
f96b434d | 1004 | poll_wait(file, &input_devices_poll_wait, wait); |
fa886612 DT |
1005 | if (file->f_version != input_devices_state) { |
1006 | file->f_version = input_devices_state; | |
f96b434d | 1007 | return POLLIN | POLLRDNORM; |
fa886612 | 1008 | } |
1e0afb28 | 1009 | |
f96b434d DT |
1010 | return 0; |
1011 | } | |
1012 | ||
1572ca2a DT |
1013 | union input_seq_state { |
1014 | struct { | |
1015 | unsigned short pos; | |
1016 | bool mutex_acquired; | |
1017 | }; | |
1018 | void *p; | |
1019 | }; | |
1020 | ||
969b21cd DT |
1021 | static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) |
1022 | { | |
1572ca2a DT |
1023 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1024 | int error; | |
1025 | ||
1026 | /* We need to fit into seq->private pointer */ | |
1027 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
1028 | ||
1029 | error = mutex_lock_interruptible(&input_mutex); | |
1030 | if (error) { | |
1031 | state->mutex_acquired = false; | |
1032 | return ERR_PTR(error); | |
1033 | } | |
1034 | ||
1035 | state->mutex_acquired = true; | |
f96b434d | 1036 | |
ad5d972c | 1037 | return seq_list_start(&input_dev_list, *pos); |
969b21cd | 1038 | } |
051b2fea | 1039 | |
969b21cd DT |
1040 | static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1041 | { | |
ad5d972c | 1042 | return seq_list_next(v, &input_dev_list, pos); |
969b21cd | 1043 | } |
f96b434d | 1044 | |
1572ca2a | 1045 | static void input_seq_stop(struct seq_file *seq, void *v) |
969b21cd | 1046 | { |
1572ca2a DT |
1047 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1048 | ||
1049 | if (state->mutex_acquired) | |
1050 | mutex_unlock(&input_mutex); | |
969b21cd | 1051 | } |
f96b434d | 1052 | |
969b21cd DT |
1053 | static void input_seq_print_bitmap(struct seq_file *seq, const char *name, |
1054 | unsigned long *bitmap, int max) | |
1055 | { | |
1056 | int i; | |
15e184af DT |
1057 | bool skip_empty = true; |
1058 | char buf[18]; | |
f96b434d | 1059 | |
969b21cd | 1060 | seq_printf(seq, "B: %s=", name); |
15e184af DT |
1061 | |
1062 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
1063 | if (input_bits_to_string(buf, sizeof(buf), | |
1064 | bitmap[i], skip_empty)) { | |
1065 | skip_empty = false; | |
1066 | seq_printf(seq, "%s%s", buf, i > 0 ? " " : ""); | |
1067 | } | |
1068 | } | |
1069 | ||
1070 | /* | |
1071 | * If no output was produced print a single 0. | |
1072 | */ | |
1073 | if (skip_empty) | |
1074 | seq_puts(seq, "0"); | |
1075 | ||
969b21cd DT |
1076 | seq_putc(seq, '\n'); |
1077 | } | |
f96b434d | 1078 | |
969b21cd DT |
1079 | static int input_devices_seq_show(struct seq_file *seq, void *v) |
1080 | { | |
1081 | struct input_dev *dev = container_of(v, struct input_dev, node); | |
9657d75c | 1082 | const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
969b21cd DT |
1083 | struct input_handle *handle; |
1084 | ||
1085 | seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", | |
1086 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); | |
1087 | ||
1088 | seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); | |
1089 | seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : ""); | |
1090 | seq_printf(seq, "S: Sysfs=%s\n", path ? path : ""); | |
15e03ae8 | 1091 | seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : ""); |
969b21cd DT |
1092 | seq_printf(seq, "H: Handlers="); |
1093 | ||
1094 | list_for_each_entry(handle, &dev->h_list, d_node) | |
1095 | seq_printf(seq, "%s ", handle->name); | |
1096 | seq_putc(seq, '\n'); | |
1097 | ||
1098 | input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); | |
1099 | if (test_bit(EV_KEY, dev->evbit)) | |
1100 | input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); | |
1101 | if (test_bit(EV_REL, dev->evbit)) | |
1102 | input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); | |
1103 | if (test_bit(EV_ABS, dev->evbit)) | |
1104 | input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); | |
1105 | if (test_bit(EV_MSC, dev->evbit)) | |
1106 | input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); | |
1107 | if (test_bit(EV_LED, dev->evbit)) | |
1108 | input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); | |
1109 | if (test_bit(EV_SND, dev->evbit)) | |
1110 | input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); | |
1111 | if (test_bit(EV_FF, dev->evbit)) | |
1112 | input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); | |
1113 | if (test_bit(EV_SW, dev->evbit)) | |
1114 | input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); | |
1115 | ||
1116 | seq_putc(seq, '\n'); | |
1117 | ||
1118 | kfree(path); | |
1119 | return 0; | |
f96b434d DT |
1120 | } |
1121 | ||
cec69c37 | 1122 | static const struct seq_operations input_devices_seq_ops = { |
969b21cd DT |
1123 | .start = input_devices_seq_start, |
1124 | .next = input_devices_seq_next, | |
1572ca2a | 1125 | .stop = input_seq_stop, |
969b21cd DT |
1126 | .show = input_devices_seq_show, |
1127 | }; | |
1128 | ||
1129 | static int input_proc_devices_open(struct inode *inode, struct file *file) | |
f96b434d | 1130 | { |
969b21cd DT |
1131 | return seq_open(file, &input_devices_seq_ops); |
1132 | } | |
1133 | ||
2b8693c0 | 1134 | static const struct file_operations input_devices_fileops = { |
969b21cd DT |
1135 | .owner = THIS_MODULE, |
1136 | .open = input_proc_devices_open, | |
1137 | .poll = input_proc_devices_poll, | |
1138 | .read = seq_read, | |
1139 | .llseek = seq_lseek, | |
1140 | .release = seq_release, | |
1141 | }; | |
1142 | ||
1143 | static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) | |
1144 | { | |
1572ca2a DT |
1145 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1146 | int error; | |
1147 | ||
1148 | /* We need to fit into seq->private pointer */ | |
1149 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
1150 | ||
1151 | error = mutex_lock_interruptible(&input_mutex); | |
1152 | if (error) { | |
1153 | state->mutex_acquired = false; | |
1154 | return ERR_PTR(error); | |
1155 | } | |
1156 | ||
1157 | state->mutex_acquired = true; | |
1158 | state->pos = *pos; | |
8006479c | 1159 | |
ad5d972c | 1160 | return seq_list_start(&input_handler_list, *pos); |
969b21cd | 1161 | } |
f96b434d | 1162 | |
969b21cd DT |
1163 | static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1164 | { | |
1572ca2a | 1165 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
f96b434d | 1166 | |
1572ca2a DT |
1167 | state->pos = *pos + 1; |
1168 | return seq_list_next(v, &input_handler_list, pos); | |
969b21cd DT |
1169 | } |
1170 | ||
1171 | static int input_handlers_seq_show(struct seq_file *seq, void *v) | |
1172 | { | |
1173 | struct input_handler *handler = container_of(v, struct input_handler, node); | |
1572ca2a | 1174 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
969b21cd | 1175 | |
1572ca2a | 1176 | seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name); |
ef7995f4 DT |
1177 | if (handler->filter) |
1178 | seq_puts(seq, " (filter)"); | |
969b21cd DT |
1179 | if (handler->fops) |
1180 | seq_printf(seq, " Minor=%d", handler->minor); | |
1181 | seq_putc(seq, '\n'); | |
1182 | ||
1183 | return 0; | |
1184 | } | |
1572ca2a | 1185 | |
cec69c37 | 1186 | static const struct seq_operations input_handlers_seq_ops = { |
969b21cd DT |
1187 | .start = input_handlers_seq_start, |
1188 | .next = input_handlers_seq_next, | |
1572ca2a | 1189 | .stop = input_seq_stop, |
969b21cd DT |
1190 | .show = input_handlers_seq_show, |
1191 | }; | |
1192 | ||
1193 | static int input_proc_handlers_open(struct inode *inode, struct file *file) | |
1194 | { | |
1195 | return seq_open(file, &input_handlers_seq_ops); | |
1196 | } | |
1197 | ||
2b8693c0 | 1198 | static const struct file_operations input_handlers_fileops = { |
969b21cd DT |
1199 | .owner = THIS_MODULE, |
1200 | .open = input_proc_handlers_open, | |
1201 | .read = seq_read, | |
1202 | .llseek = seq_lseek, | |
1203 | .release = seq_release, | |
1204 | }; | |
f96b434d DT |
1205 | |
1206 | static int __init input_proc_init(void) | |
1207 | { | |
1208 | struct proc_dir_entry *entry; | |
1209 | ||
9c37066d | 1210 | proc_bus_input_dir = proc_mkdir("bus/input", NULL); |
f96b434d DT |
1211 | if (!proc_bus_input_dir) |
1212 | return -ENOMEM; | |
1213 | ||
c7705f34 DL |
1214 | entry = proc_create("devices", 0, proc_bus_input_dir, |
1215 | &input_devices_fileops); | |
f96b434d DT |
1216 | if (!entry) |
1217 | goto fail1; | |
1218 | ||
c7705f34 DL |
1219 | entry = proc_create("handlers", 0, proc_bus_input_dir, |
1220 | &input_handlers_fileops); | |
f96b434d DT |
1221 | if (!entry) |
1222 | goto fail2; | |
1223 | ||
f96b434d DT |
1224 | return 0; |
1225 | ||
1226 | fail2: remove_proc_entry("devices", proc_bus_input_dir); | |
9c37066d | 1227 | fail1: remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1228 | return -ENOMEM; |
1229 | } | |
1230 | ||
beffbdc2 | 1231 | static void input_proc_exit(void) |
f96b434d DT |
1232 | { |
1233 | remove_proc_entry("devices", proc_bus_input_dir); | |
1234 | remove_proc_entry("handlers", proc_bus_input_dir); | |
9c37066d | 1235 | remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1236 | } |
1237 | ||
1238 | #else /* !CONFIG_PROC_FS */ | |
1239 | static inline void input_wakeup_procfs_readers(void) { } | |
1240 | static inline int input_proc_init(void) { return 0; } | |
1241 | static inline void input_proc_exit(void) { } | |
1242 | #endif | |
1243 | ||
9657d75c DT |
1244 | #define INPUT_DEV_STRING_ATTR_SHOW(name) \ |
1245 | static ssize_t input_dev_show_##name(struct device *dev, \ | |
1246 | struct device_attribute *attr, \ | |
1247 | char *buf) \ | |
1248 | { \ | |
1249 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1250 | \ | |
1251 | return scnprintf(buf, PAGE_SIZE, "%s\n", \ | |
1252 | input_dev->name ? input_dev->name : ""); \ | |
1253 | } \ | |
1254 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL) | |
5c1e9a6a DT |
1255 | |
1256 | INPUT_DEV_STRING_ATTR_SHOW(name); | |
1257 | INPUT_DEV_STRING_ATTR_SHOW(phys); | |
1258 | INPUT_DEV_STRING_ATTR_SHOW(uniq); | |
1259 | ||
ac648a6a DT |
1260 | static int input_print_modalias_bits(char *buf, int size, |
1261 | char name, unsigned long *bm, | |
1262 | unsigned int min_bit, unsigned int max_bit) | |
1d8f430c | 1263 | { |
ac648a6a | 1264 | int len = 0, i; |
1d8f430c | 1265 | |
ac648a6a DT |
1266 | len += snprintf(buf, max(size, 0), "%c", name); |
1267 | for (i = min_bit; i < max_bit; i++) | |
7b19ada2 | 1268 | if (bm[BIT_WORD(i)] & BIT_MASK(i)) |
ac648a6a | 1269 | len += snprintf(buf + len, max(size - len, 0), "%X,", i); |
1d8f430c RR |
1270 | return len; |
1271 | } | |
1272 | ||
2db66876 DT |
1273 | static int input_print_modalias(char *buf, int size, struct input_dev *id, |
1274 | int add_cr) | |
1d8f430c | 1275 | { |
bd37e5a9 | 1276 | int len; |
1d8f430c | 1277 | |
ac648a6a DT |
1278 | len = snprintf(buf, max(size, 0), |
1279 | "input:b%04Xv%04Xp%04Xe%04X-", | |
1280 | id->id.bustype, id->id.vendor, | |
1281 | id->id.product, id->id.version); | |
1282 | ||
1283 | len += input_print_modalias_bits(buf + len, size - len, | |
1284 | 'e', id->evbit, 0, EV_MAX); | |
1285 | len += input_print_modalias_bits(buf + len, size - len, | |
1286 | 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); | |
1287 | len += input_print_modalias_bits(buf + len, size - len, | |
1288 | 'r', id->relbit, 0, REL_MAX); | |
1289 | len += input_print_modalias_bits(buf + len, size - len, | |
1290 | 'a', id->absbit, 0, ABS_MAX); | |
1291 | len += input_print_modalias_bits(buf + len, size - len, | |
1292 | 'm', id->mscbit, 0, MSC_MAX); | |
1293 | len += input_print_modalias_bits(buf + len, size - len, | |
1294 | 'l', id->ledbit, 0, LED_MAX); | |
1295 | len += input_print_modalias_bits(buf + len, size - len, | |
1296 | 's', id->sndbit, 0, SND_MAX); | |
1297 | len += input_print_modalias_bits(buf + len, size - len, | |
1298 | 'f', id->ffbit, 0, FF_MAX); | |
1299 | len += input_print_modalias_bits(buf + len, size - len, | |
1300 | 'w', id->swbit, 0, SW_MAX); | |
2db66876 DT |
1301 | |
1302 | if (add_cr) | |
ac648a6a | 1303 | len += snprintf(buf + len, max(size - len, 0), "\n"); |
2db66876 | 1304 | |
bd37e5a9 KS |
1305 | return len; |
1306 | } | |
1307 | ||
9657d75c DT |
1308 | static ssize_t input_dev_show_modalias(struct device *dev, |
1309 | struct device_attribute *attr, | |
1310 | char *buf) | |
bd37e5a9 KS |
1311 | { |
1312 | struct input_dev *id = to_input_dev(dev); | |
1313 | ssize_t len; | |
1314 | ||
2db66876 DT |
1315 | len = input_print_modalias(buf, PAGE_SIZE, id, 1); |
1316 | ||
8a3cf456 | 1317 | return min_t(int, len, PAGE_SIZE); |
1d8f430c | 1318 | } |
9657d75c | 1319 | static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); |
1d8f430c | 1320 | |
629b77a4 | 1321 | static struct attribute *input_dev_attrs[] = { |
9657d75c DT |
1322 | &dev_attr_name.attr, |
1323 | &dev_attr_phys.attr, | |
1324 | &dev_attr_uniq.attr, | |
1325 | &dev_attr_modalias.attr, | |
629b77a4 GKH |
1326 | NULL |
1327 | }; | |
1328 | ||
bd0ef235 | 1329 | static struct attribute_group input_dev_attr_group = { |
629b77a4 | 1330 | .attrs = input_dev_attrs, |
5c1e9a6a DT |
1331 | }; |
1332 | ||
9657d75c DT |
1333 | #define INPUT_DEV_ID_ATTR(name) \ |
1334 | static ssize_t input_dev_show_id_##name(struct device *dev, \ | |
1335 | struct device_attribute *attr, \ | |
1336 | char *buf) \ | |
1337 | { \ | |
1338 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1339 | return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \ | |
1340 | } \ | |
1341 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL) | |
5c1e9a6a DT |
1342 | |
1343 | INPUT_DEV_ID_ATTR(bustype); | |
1344 | INPUT_DEV_ID_ATTR(vendor); | |
1345 | INPUT_DEV_ID_ATTR(product); | |
1346 | INPUT_DEV_ID_ATTR(version); | |
1347 | ||
1348 | static struct attribute *input_dev_id_attrs[] = { | |
9657d75c DT |
1349 | &dev_attr_bustype.attr, |
1350 | &dev_attr_vendor.attr, | |
1351 | &dev_attr_product.attr, | |
1352 | &dev_attr_version.attr, | |
5c1e9a6a DT |
1353 | NULL |
1354 | }; | |
1355 | ||
1356 | static struct attribute_group input_dev_id_attr_group = { | |
1357 | .name = "id", | |
1358 | .attrs = input_dev_id_attrs, | |
1359 | }; | |
1360 | ||
969b21cd DT |
1361 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1362 | int max, int add_cr) | |
1363 | { | |
1364 | int i; | |
1365 | int len = 0; | |
15e184af DT |
1366 | bool skip_empty = true; |
1367 | ||
1368 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
1369 | len += input_bits_to_string(buf + len, max(buf_size - len, 0), | |
1370 | bitmap[i], skip_empty); | |
1371 | if (len) { | |
1372 | skip_empty = false; | |
1373 | if (i > 0) | |
1374 | len += snprintf(buf + len, max(buf_size - len, 0), " "); | |
1375 | } | |
1376 | } | |
969b21cd | 1377 | |
15e184af DT |
1378 | /* |
1379 | * If no output was produced print a single 0. | |
1380 | */ | |
1381 | if (len == 0) | |
1382 | len = snprintf(buf, buf_size, "%d", 0); | |
969b21cd DT |
1383 | |
1384 | if (add_cr) | |
1385 | len += snprintf(buf + len, max(buf_size - len, 0), "\n"); | |
1386 | ||
1387 | return len; | |
1388 | } | |
1389 | ||
9657d75c DT |
1390 | #define INPUT_DEV_CAP_ATTR(ev, bm) \ |
1391 | static ssize_t input_dev_show_cap_##bm(struct device *dev, \ | |
1392 | struct device_attribute *attr, \ | |
1393 | char *buf) \ | |
1394 | { \ | |
1395 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1396 | int len = input_print_bitmap(buf, PAGE_SIZE, \ | |
15e184af DT |
1397 | input_dev->bm##bit, ev##_MAX, \ |
1398 | true); \ | |
9657d75c DT |
1399 | return min_t(int, len, PAGE_SIZE); \ |
1400 | } \ | |
1401 | static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL) | |
5c1e9a6a DT |
1402 | |
1403 | INPUT_DEV_CAP_ATTR(EV, ev); | |
1404 | INPUT_DEV_CAP_ATTR(KEY, key); | |
1405 | INPUT_DEV_CAP_ATTR(REL, rel); | |
1406 | INPUT_DEV_CAP_ATTR(ABS, abs); | |
1407 | INPUT_DEV_CAP_ATTR(MSC, msc); | |
1408 | INPUT_DEV_CAP_ATTR(LED, led); | |
1409 | INPUT_DEV_CAP_ATTR(SND, snd); | |
1410 | INPUT_DEV_CAP_ATTR(FF, ff); | |
1411 | INPUT_DEV_CAP_ATTR(SW, sw); | |
1412 | ||
1413 | static struct attribute *input_dev_caps_attrs[] = { | |
9657d75c DT |
1414 | &dev_attr_ev.attr, |
1415 | &dev_attr_key.attr, | |
1416 | &dev_attr_rel.attr, | |
1417 | &dev_attr_abs.attr, | |
1418 | &dev_attr_msc.attr, | |
1419 | &dev_attr_led.attr, | |
1420 | &dev_attr_snd.attr, | |
1421 | &dev_attr_ff.attr, | |
1422 | &dev_attr_sw.attr, | |
5c1e9a6a DT |
1423 | NULL |
1424 | }; | |
1425 | ||
1426 | static struct attribute_group input_dev_caps_attr_group = { | |
1427 | .name = "capabilities", | |
1428 | .attrs = input_dev_caps_attrs, | |
1429 | }; | |
1430 | ||
a4dbd674 | 1431 | static const struct attribute_group *input_dev_attr_groups[] = { |
cb9def4d DT |
1432 | &input_dev_attr_group, |
1433 | &input_dev_id_attr_group, | |
1434 | &input_dev_caps_attr_group, | |
1435 | NULL | |
1436 | }; | |
1437 | ||
9657d75c | 1438 | static void input_dev_release(struct device *device) |
d19fbe8a | 1439 | { |
9657d75c | 1440 | struct input_dev *dev = to_input_dev(device); |
d19fbe8a | 1441 | |
509ca1a9 | 1442 | input_ff_destroy(dev); |
40d007e7 | 1443 | input_mt_destroy_slots(dev); |
d31b2865 | 1444 | kfree(dev->absinfo); |
d19fbe8a | 1445 | kfree(dev); |
509ca1a9 | 1446 | |
d19fbe8a DT |
1447 | module_put(THIS_MODULE); |
1448 | } | |
1449 | ||
a7fadbe1 | 1450 | /* |
312c004d | 1451 | * Input uevent interface - loading event handlers based on |
a7fadbe1 DT |
1452 | * device bitfields. |
1453 | */ | |
7eff2e7a | 1454 | static int input_add_uevent_bm_var(struct kobj_uevent_env *env, |
ac648a6a | 1455 | const char *name, unsigned long *bitmap, int max) |
a7fadbe1 | 1456 | { |
7eff2e7a | 1457 | int len; |
a7fadbe1 | 1458 | |
7eff2e7a | 1459 | if (add_uevent_var(env, "%s=", name)) |
a7fadbe1 DT |
1460 | return -ENOMEM; |
1461 | ||
7eff2e7a KS |
1462 | len = input_print_bitmap(&env->buf[env->buflen - 1], |
1463 | sizeof(env->buf) - env->buflen, | |
15e184af | 1464 | bitmap, max, false); |
7eff2e7a | 1465 | if (len >= (sizeof(env->buf) - env->buflen)) |
a7fadbe1 DT |
1466 | return -ENOMEM; |
1467 | ||
7eff2e7a | 1468 | env->buflen += len; |
a7fadbe1 DT |
1469 | return 0; |
1470 | } | |
1471 | ||
7eff2e7a | 1472 | static int input_add_uevent_modalias_var(struct kobj_uevent_env *env, |
ac648a6a DT |
1473 | struct input_dev *dev) |
1474 | { | |
7eff2e7a | 1475 | int len; |
ac648a6a | 1476 | |
7eff2e7a | 1477 | if (add_uevent_var(env, "MODALIAS=")) |
ac648a6a DT |
1478 | return -ENOMEM; |
1479 | ||
7eff2e7a KS |
1480 | len = input_print_modalias(&env->buf[env->buflen - 1], |
1481 | sizeof(env->buf) - env->buflen, | |
1482 | dev, 0); | |
1483 | if (len >= (sizeof(env->buf) - env->buflen)) | |
ac648a6a DT |
1484 | return -ENOMEM; |
1485 | ||
7eff2e7a | 1486 | env->buflen += len; |
ac648a6a DT |
1487 | return 0; |
1488 | } | |
1489 | ||
a7fadbe1 DT |
1490 | #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \ |
1491 | do { \ | |
7eff2e7a | 1492 | int err = add_uevent_var(env, fmt, val); \ |
a7fadbe1 DT |
1493 | if (err) \ |
1494 | return err; \ | |
1495 | } while (0) | |
1496 | ||
1497 | #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \ | |
1498 | do { \ | |
7eff2e7a | 1499 | int err = input_add_uevent_bm_var(env, name, bm, max); \ |
a7fadbe1 DT |
1500 | if (err) \ |
1501 | return err; \ | |
1502 | } while (0) | |
1503 | ||
ac648a6a DT |
1504 | #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \ |
1505 | do { \ | |
7eff2e7a | 1506 | int err = input_add_uevent_modalias_var(env, dev); \ |
ac648a6a DT |
1507 | if (err) \ |
1508 | return err; \ | |
1509 | } while (0) | |
1510 | ||
7eff2e7a | 1511 | static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env) |
a7fadbe1 | 1512 | { |
9657d75c | 1513 | struct input_dev *dev = to_input_dev(device); |
a7fadbe1 DT |
1514 | |
1515 | INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x", | |
1516 | dev->id.bustype, dev->id.vendor, | |
1517 | dev->id.product, dev->id.version); | |
1518 | if (dev->name) | |
1519 | INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); | |
1520 | if (dev->phys) | |
1521 | INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); | |
08de1f04 | 1522 | if (dev->uniq) |
a7fadbe1 DT |
1523 | INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); |
1524 | ||
1525 | INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX); | |
1526 | if (test_bit(EV_KEY, dev->evbit)) | |
1527 | INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX); | |
1528 | if (test_bit(EV_REL, dev->evbit)) | |
1529 | INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX); | |
1530 | if (test_bit(EV_ABS, dev->evbit)) | |
1531 | INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX); | |
1532 | if (test_bit(EV_MSC, dev->evbit)) | |
1533 | INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX); | |
1534 | if (test_bit(EV_LED, dev->evbit)) | |
1535 | INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX); | |
1536 | if (test_bit(EV_SND, dev->evbit)) | |
1537 | INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX); | |
1538 | if (test_bit(EV_FF, dev->evbit)) | |
1539 | INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX); | |
1540 | if (test_bit(EV_SW, dev->evbit)) | |
1541 | INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); | |
1542 | ||
ac648a6a | 1543 | INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); |
a7fadbe1 DT |
1544 | |
1545 | return 0; | |
1546 | } | |
1547 | ||
3cc96351 DT |
1548 | #define INPUT_DO_TOGGLE(dev, type, bits, on) \ |
1549 | do { \ | |
1550 | int i; \ | |
1551 | bool active; \ | |
1552 | \ | |
1553 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1554 | break; \ | |
1555 | \ | |
1556 | for (i = 0; i < type##_MAX; i++) { \ | |
1557 | if (!test_bit(i, dev->bits##bit)) \ | |
1558 | continue; \ | |
1559 | \ | |
1560 | active = test_bit(i, dev->bits); \ | |
1561 | if (!active && !on) \ | |
1562 | continue; \ | |
1563 | \ | |
1564 | dev->event(dev, EV_##type, i, on ? active : 0); \ | |
1565 | } \ | |
ffd0db97 DT |
1566 | } while (0) |
1567 | ||
1c4115e5 | 1568 | #ifdef CONFIG_PM |
ffd0db97 DT |
1569 | static void input_dev_reset(struct input_dev *dev, bool activate) |
1570 | { | |
1571 | if (!dev->event) | |
1572 | return; | |
1573 | ||
1574 | INPUT_DO_TOGGLE(dev, LED, led, activate); | |
1575 | INPUT_DO_TOGGLE(dev, SND, snd, activate); | |
1576 | ||
1577 | if (activate && test_bit(EV_REP, dev->evbit)) { | |
1578 | dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]); | |
1579 | dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]); | |
1580 | } | |
1581 | } | |
1582 | ||
ffd0db97 DT |
1583 | static int input_dev_suspend(struct device *dev) |
1584 | { | |
1585 | struct input_dev *input_dev = to_input_dev(dev); | |
1586 | ||
1587 | mutex_lock(&input_dev->mutex); | |
1588 | input_dev_reset(input_dev, false); | |
1589 | mutex_unlock(&input_dev->mutex); | |
1590 | ||
1591 | return 0; | |
1592 | } | |
1593 | ||
1594 | static int input_dev_resume(struct device *dev) | |
1595 | { | |
1596 | struct input_dev *input_dev = to_input_dev(dev); | |
1597 | ||
1598 | mutex_lock(&input_dev->mutex); | |
1599 | input_dev_reset(input_dev, true); | |
866d7d7b ON |
1600 | |
1601 | /* | |
1602 | * Keys that have been pressed at suspend time are unlikely | |
1603 | * to be still pressed when we resume. | |
1604 | */ | |
1605 | spin_lock_irq(&input_dev->event_lock); | |
1606 | input_dev_release_keys(input_dev); | |
1607 | spin_unlock_irq(&input_dev->event_lock); | |
1608 | ||
ffd0db97 DT |
1609 | mutex_unlock(&input_dev->mutex); |
1610 | ||
1611 | return 0; | |
1612 | } | |
1613 | ||
1614 | static const struct dev_pm_ops input_dev_pm_ops = { | |
1615 | .suspend = input_dev_suspend, | |
1616 | .resume = input_dev_resume, | |
1617 | .poweroff = input_dev_suspend, | |
1618 | .restore = input_dev_resume, | |
1619 | }; | |
1620 | #endif /* CONFIG_PM */ | |
1621 | ||
9657d75c DT |
1622 | static struct device_type input_dev_type = { |
1623 | .groups = input_dev_attr_groups, | |
1624 | .release = input_dev_release, | |
1625 | .uevent = input_dev_uevent, | |
ffd0db97 DT |
1626 | #ifdef CONFIG_PM |
1627 | .pm = &input_dev_pm_ops, | |
1628 | #endif | |
9657d75c DT |
1629 | }; |
1630 | ||
e454cea2 | 1631 | static char *input_devnode(struct device *dev, mode_t *mode) |
aa5ed63e KS |
1632 | { |
1633 | return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev)); | |
1634 | } | |
1635 | ||
ea9f240b | 1636 | struct class input_class = { |
9657d75c | 1637 | .name = "input", |
e454cea2 | 1638 | .devnode = input_devnode, |
d19fbe8a | 1639 | }; |
ca56fe07 | 1640 | EXPORT_SYMBOL_GPL(input_class); |
d19fbe8a | 1641 | |
1447190e DT |
1642 | /** |
1643 | * input_allocate_device - allocate memory for new input device | |
1644 | * | |
1645 | * Returns prepared struct input_dev or NULL. | |
1646 | * | |
1647 | * NOTE: Use input_free_device() to free devices that have not been | |
1648 | * registered; input_unregister_device() should be used for already | |
1649 | * registered devices. | |
1650 | */ | |
d19fbe8a DT |
1651 | struct input_dev *input_allocate_device(void) |
1652 | { | |
1653 | struct input_dev *dev; | |
1654 | ||
1655 | dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); | |
1656 | if (dev) { | |
9657d75c DT |
1657 | dev->dev.type = &input_dev_type; |
1658 | dev->dev.class = &input_class; | |
1659 | device_initialize(&dev->dev); | |
f60d2b11 | 1660 | mutex_init(&dev->mutex); |
8006479c | 1661 | spin_lock_init(&dev->event_lock); |
d19fbe8a DT |
1662 | INIT_LIST_HEAD(&dev->h_list); |
1663 | INIT_LIST_HEAD(&dev->node); | |
655816e4 DT |
1664 | |
1665 | __module_get(THIS_MODULE); | |
d19fbe8a DT |
1666 | } |
1667 | ||
1668 | return dev; | |
1669 | } | |
ca56fe07 | 1670 | EXPORT_SYMBOL(input_allocate_device); |
d19fbe8a | 1671 | |
1447190e DT |
1672 | /** |
1673 | * input_free_device - free memory occupied by input_dev structure | |
1674 | * @dev: input device to free | |
1675 | * | |
1676 | * This function should only be used if input_register_device() | |
1677 | * was not called yet or if it failed. Once device was registered | |
1678 | * use input_unregister_device() and memory will be freed once last | |
8006479c | 1679 | * reference to the device is dropped. |
1447190e DT |
1680 | * |
1681 | * Device should be allocated by input_allocate_device(). | |
1682 | * | |
1683 | * NOTE: If there are references to the input device then memory | |
1684 | * will not be freed until last reference is dropped. | |
1685 | */ | |
f60d2b11 DT |
1686 | void input_free_device(struct input_dev *dev) |
1687 | { | |
54f9e36c | 1688 | if (dev) |
f60d2b11 | 1689 | input_put_device(dev); |
f60d2b11 | 1690 | } |
ca56fe07 | 1691 | EXPORT_SYMBOL(input_free_device); |
f60d2b11 | 1692 | |
534565f2 DT |
1693 | /** |
1694 | * input_set_capability - mark device as capable of a certain event | |
1695 | * @dev: device that is capable of emitting or accepting event | |
1696 | * @type: type of the event (EV_KEY, EV_REL, etc...) | |
1697 | * @code: event code | |
1698 | * | |
1699 | * In addition to setting up corresponding bit in appropriate capability | |
1700 | * bitmap the function also adjusts dev->evbit. | |
1701 | */ | |
1702 | void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code) | |
1703 | { | |
1704 | switch (type) { | |
1705 | case EV_KEY: | |
1706 | __set_bit(code, dev->keybit); | |
1707 | break; | |
1708 | ||
1709 | case EV_REL: | |
1710 | __set_bit(code, dev->relbit); | |
1711 | break; | |
1712 | ||
1713 | case EV_ABS: | |
1714 | __set_bit(code, dev->absbit); | |
1715 | break; | |
1716 | ||
1717 | case EV_MSC: | |
1718 | __set_bit(code, dev->mscbit); | |
1719 | break; | |
1720 | ||
1721 | case EV_SW: | |
1722 | __set_bit(code, dev->swbit); | |
1723 | break; | |
1724 | ||
1725 | case EV_LED: | |
1726 | __set_bit(code, dev->ledbit); | |
1727 | break; | |
1728 | ||
1729 | case EV_SND: | |
1730 | __set_bit(code, dev->sndbit); | |
1731 | break; | |
1732 | ||
1733 | case EV_FF: | |
1734 | __set_bit(code, dev->ffbit); | |
1735 | break; | |
1736 | ||
22d1c398 DB |
1737 | case EV_PWR: |
1738 | /* do nothing */ | |
1739 | break; | |
1740 | ||
534565f2 DT |
1741 | default: |
1742 | printk(KERN_ERR | |
1743 | "input_set_capability: unknown type %u (code %u)\n", | |
1744 | type, code); | |
1745 | dump_stack(); | |
1746 | return; | |
1747 | } | |
1748 | ||
1749 | __set_bit(type, dev->evbit); | |
1750 | } | |
1751 | EXPORT_SYMBOL(input_set_capability); | |
1752 | ||
92a3a587 DT |
1753 | #define INPUT_CLEANSE_BITMASK(dev, type, bits) \ |
1754 | do { \ | |
1755 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1756 | memset(dev->bits##bit, 0, \ | |
1757 | sizeof(dev->bits##bit)); \ | |
1758 | } while (0) | |
1759 | ||
1760 | static void input_cleanse_bitmasks(struct input_dev *dev) | |
1761 | { | |
1762 | INPUT_CLEANSE_BITMASK(dev, KEY, key); | |
1763 | INPUT_CLEANSE_BITMASK(dev, REL, rel); | |
1764 | INPUT_CLEANSE_BITMASK(dev, ABS, abs); | |
1765 | INPUT_CLEANSE_BITMASK(dev, MSC, msc); | |
1766 | INPUT_CLEANSE_BITMASK(dev, LED, led); | |
1767 | INPUT_CLEANSE_BITMASK(dev, SND, snd); | |
1768 | INPUT_CLEANSE_BITMASK(dev, FF, ff); | |
1769 | INPUT_CLEANSE_BITMASK(dev, SW, sw); | |
1770 | } | |
1771 | ||
8006479c DT |
1772 | /** |
1773 | * input_register_device - register device with input core | |
1774 | * @dev: device to be registered | |
1775 | * | |
1776 | * This function registers device with input core. The device must be | |
1777 | * allocated with input_allocate_device() and all it's capabilities | |
1778 | * set up before registering. | |
1779 | * If function fails the device must be freed with input_free_device(). | |
1780 | * Once device has been successfully registered it can be unregistered | |
1781 | * with input_unregister_device(); input_free_device() should not be | |
1782 | * called in this case. | |
1783 | */ | |
5f945489 | 1784 | int input_register_device(struct input_dev *dev) |
1da177e4 | 1785 | { |
bd0ef235 | 1786 | static atomic_t input_no = ATOMIC_INIT(0); |
1da177e4 | 1787 | struct input_handler *handler; |
bd0ef235 DT |
1788 | const char *path; |
1789 | int error; | |
1da177e4 | 1790 | |
4f93df40 | 1791 | /* Every input device generates EV_SYN/SYN_REPORT events. */ |
8006479c | 1792 | __set_bit(EV_SYN, dev->evbit); |
0fbf87ca | 1793 | |
4f93df40 DT |
1794 | /* KEY_RESERVED is not supposed to be transmitted to userspace. */ |
1795 | __clear_bit(KEY_RESERVED, dev->keybit); | |
1796 | ||
92a3a587 DT |
1797 | /* Make sure that bitmasks not mentioned in dev->evbit are clean. */ |
1798 | input_cleanse_bitmasks(dev); | |
1799 | ||
1da177e4 LT |
1800 | /* |
1801 | * If delay and period are pre-set by the driver, then autorepeating | |
1802 | * is handled by the driver itself and we don't do it in input.c. | |
1803 | */ | |
1da177e4 LT |
1804 | init_timer(&dev->timer); |
1805 | if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { | |
1806 | dev->timer.data = (long) dev; | |
1807 | dev->timer.function = input_repeat_key; | |
1808 | dev->rep[REP_DELAY] = 250; | |
1809 | dev->rep[REP_PERIOD] = 33; | |
1810 | } | |
1811 | ||
8613e4c2 MCC |
1812 | if (!dev->getkeycode && !dev->getkeycode_new) |
1813 | dev->getkeycode_new = input_default_getkeycode; | |
c8e4c772 | 1814 | |
8613e4c2 MCC |
1815 | if (!dev->setkeycode && !dev->setkeycode_new) |
1816 | dev->setkeycode_new = input_default_setkeycode; | |
c8e4c772 | 1817 | |
a6c2490f KS |
1818 | dev_set_name(&dev->dev, "input%ld", |
1819 | (unsigned long) atomic_inc_return(&input_no) - 1); | |
bd0ef235 | 1820 | |
9657d75c | 1821 | error = device_add(&dev->dev); |
bd0ef235 DT |
1822 | if (error) |
1823 | return error; | |
1824 | ||
9657d75c | 1825 | path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
bd0ef235 DT |
1826 | printk(KERN_INFO "input: %s as %s\n", |
1827 | dev->name ? dev->name : "Unspecified device", path ? path : "N/A"); | |
1828 | kfree(path); | |
10204020 | 1829 | |
8006479c DT |
1830 | error = mutex_lock_interruptible(&input_mutex); |
1831 | if (error) { | |
1832 | device_del(&dev->dev); | |
1833 | return error; | |
1834 | } | |
1835 | ||
1836 | list_add_tail(&dev->node, &input_dev_list); | |
1837 | ||
1da177e4 | 1838 | list_for_each_entry(handler, &input_handler_list, node) |
5b2a0826 | 1839 | input_attach_handler(dev, handler); |
1da177e4 | 1840 | |
f96b434d | 1841 | input_wakeup_procfs_readers(); |
5f945489 | 1842 | |
8006479c DT |
1843 | mutex_unlock(&input_mutex); |
1844 | ||
5f945489 | 1845 | return 0; |
1da177e4 | 1846 | } |
ca56fe07 | 1847 | EXPORT_SYMBOL(input_register_device); |
1da177e4 | 1848 | |
8006479c DT |
1849 | /** |
1850 | * input_unregister_device - unregister previously registered device | |
1851 | * @dev: device to be unregistered | |
1852 | * | |
1853 | * This function unregisters an input device. Once device is unregistered | |
1854 | * the caller should not try to access it as it may get freed at any moment. | |
1855 | */ | |
1da177e4 LT |
1856 | void input_unregister_device(struct input_dev *dev) |
1857 | { | |
5b2a0826 | 1858 | struct input_handle *handle, *next; |
1da177e4 | 1859 | |
8006479c | 1860 | input_disconnect_device(dev); |
1da177e4 | 1861 | |
8006479c | 1862 | mutex_lock(&input_mutex); |
1da177e4 | 1863 | |
5b2a0826 | 1864 | list_for_each_entry_safe(handle, next, &dev->h_list, d_node) |
1da177e4 | 1865 | handle->handler->disconnect(handle); |
5b2a0826 | 1866 | WARN_ON(!list_empty(&dev->h_list)); |
1da177e4 | 1867 | |
8006479c | 1868 | del_timer_sync(&dev->timer); |
1da177e4 LT |
1869 | list_del_init(&dev->node); |
1870 | ||
f96b434d | 1871 | input_wakeup_procfs_readers(); |
8006479c DT |
1872 | |
1873 | mutex_unlock(&input_mutex); | |
1874 | ||
1875 | device_unregister(&dev->dev); | |
1da177e4 | 1876 | } |
ca56fe07 | 1877 | EXPORT_SYMBOL(input_unregister_device); |
1da177e4 | 1878 | |
8006479c DT |
1879 | /** |
1880 | * input_register_handler - register a new input handler | |
1881 | * @handler: handler to be registered | |
1882 | * | |
1883 | * This function registers a new input handler (interface) for input | |
1884 | * devices in the system and attaches it to all input devices that | |
1885 | * are compatible with the handler. | |
1886 | */ | |
4263cf0f | 1887 | int input_register_handler(struct input_handler *handler) |
1da177e4 LT |
1888 | { |
1889 | struct input_dev *dev; | |
8006479c DT |
1890 | int retval; |
1891 | ||
1892 | retval = mutex_lock_interruptible(&input_mutex); | |
1893 | if (retval) | |
1894 | return retval; | |
1da177e4 | 1895 | |
1da177e4 LT |
1896 | INIT_LIST_HEAD(&handler->h_list); |
1897 | ||
4263cf0f | 1898 | if (handler->fops != NULL) { |
8006479c DT |
1899 | if (input_table[handler->minor >> 5]) { |
1900 | retval = -EBUSY; | |
1901 | goto out; | |
1902 | } | |
1da177e4 | 1903 | input_table[handler->minor >> 5] = handler; |
4263cf0f | 1904 | } |
1da177e4 LT |
1905 | |
1906 | list_add_tail(&handler->node, &input_handler_list); | |
1907 | ||
1908 | list_for_each_entry(dev, &input_dev_list, node) | |
5b2a0826 | 1909 | input_attach_handler(dev, handler); |
1da177e4 | 1910 | |
f96b434d | 1911 | input_wakeup_procfs_readers(); |
8006479c DT |
1912 | |
1913 | out: | |
1914 | mutex_unlock(&input_mutex); | |
1915 | return retval; | |
1da177e4 | 1916 | } |
ca56fe07 | 1917 | EXPORT_SYMBOL(input_register_handler); |
1da177e4 | 1918 | |
8006479c DT |
1919 | /** |
1920 | * input_unregister_handler - unregisters an input handler | |
1921 | * @handler: handler to be unregistered | |
1922 | * | |
1923 | * This function disconnects a handler from its input devices and | |
1924 | * removes it from lists of known handlers. | |
1925 | */ | |
1da177e4 LT |
1926 | void input_unregister_handler(struct input_handler *handler) |
1927 | { | |
5b2a0826 | 1928 | struct input_handle *handle, *next; |
1da177e4 | 1929 | |
8006479c DT |
1930 | mutex_lock(&input_mutex); |
1931 | ||
5b2a0826 | 1932 | list_for_each_entry_safe(handle, next, &handler->h_list, h_node) |
1da177e4 | 1933 | handler->disconnect(handle); |
5b2a0826 | 1934 | WARN_ON(!list_empty(&handler->h_list)); |
1da177e4 LT |
1935 | |
1936 | list_del_init(&handler->node); | |
1937 | ||
1938 | if (handler->fops != NULL) | |
1939 | input_table[handler->minor >> 5] = NULL; | |
1940 | ||
f96b434d | 1941 | input_wakeup_procfs_readers(); |
8006479c DT |
1942 | |
1943 | mutex_unlock(&input_mutex); | |
1da177e4 | 1944 | } |
ca56fe07 | 1945 | EXPORT_SYMBOL(input_unregister_handler); |
1da177e4 | 1946 | |
66d2a595 DT |
1947 | /** |
1948 | * input_handler_for_each_handle - handle iterator | |
1949 | * @handler: input handler to iterate | |
1950 | * @data: data for the callback | |
1951 | * @fn: function to be called for each handle | |
1952 | * | |
1953 | * Iterate over @bus's list of devices, and call @fn for each, passing | |
1954 | * it @data and stop when @fn returns a non-zero value. The function is | |
1955 | * using RCU to traverse the list and therefore may be usind in atonic | |
1956 | * contexts. The @fn callback is invoked from RCU critical section and | |
1957 | * thus must not sleep. | |
1958 | */ | |
1959 | int input_handler_for_each_handle(struct input_handler *handler, void *data, | |
1960 | int (*fn)(struct input_handle *, void *)) | |
1961 | { | |
1962 | struct input_handle *handle; | |
1963 | int retval = 0; | |
1964 | ||
1965 | rcu_read_lock(); | |
1966 | ||
1967 | list_for_each_entry_rcu(handle, &handler->h_list, h_node) { | |
1968 | retval = fn(handle, data); | |
1969 | if (retval) | |
1970 | break; | |
1971 | } | |
1972 | ||
1973 | rcu_read_unlock(); | |
1974 | ||
1975 | return retval; | |
1976 | } | |
1977 | EXPORT_SYMBOL(input_handler_for_each_handle); | |
1978 | ||
8006479c DT |
1979 | /** |
1980 | * input_register_handle - register a new input handle | |
1981 | * @handle: handle to register | |
1982 | * | |
1983 | * This function puts a new input handle onto device's | |
1984 | * and handler's lists so that events can flow through | |
1985 | * it once it is opened using input_open_device(). | |
1986 | * | |
1987 | * This function is supposed to be called from handler's | |
1988 | * connect() method. | |
1989 | */ | |
5b2a0826 DT |
1990 | int input_register_handle(struct input_handle *handle) |
1991 | { | |
1992 | struct input_handler *handler = handle->handler; | |
8006479c DT |
1993 | struct input_dev *dev = handle->dev; |
1994 | int error; | |
1995 | ||
1996 | /* | |
1997 | * We take dev->mutex here to prevent race with | |
1998 | * input_release_device(). | |
1999 | */ | |
2000 | error = mutex_lock_interruptible(&dev->mutex); | |
2001 | if (error) | |
2002 | return error; | |
ef7995f4 DT |
2003 | |
2004 | /* | |
2005 | * Filters go to the head of the list, normal handlers | |
2006 | * to the tail. | |
2007 | */ | |
2008 | if (handler->filter) | |
2009 | list_add_rcu(&handle->d_node, &dev->h_list); | |
2010 | else | |
2011 | list_add_tail_rcu(&handle->d_node, &dev->h_list); | |
2012 | ||
8006479c | 2013 | mutex_unlock(&dev->mutex); |
5b2a0826 | 2014 | |
8006479c DT |
2015 | /* |
2016 | * Since we are supposed to be called from ->connect() | |
2017 | * which is mutually exclusive with ->disconnect() | |
2018 | * we can't be racing with input_unregister_handle() | |
2019 | * and so separate lock is not needed here. | |
2020 | */ | |
66d2a595 | 2021 | list_add_tail_rcu(&handle->h_node, &handler->h_list); |
5b2a0826 DT |
2022 | |
2023 | if (handler->start) | |
2024 | handler->start(handle); | |
2025 | ||
2026 | return 0; | |
2027 | } | |
2028 | EXPORT_SYMBOL(input_register_handle); | |
2029 | ||
8006479c DT |
2030 | /** |
2031 | * input_unregister_handle - unregister an input handle | |
2032 | * @handle: handle to unregister | |
2033 | * | |
2034 | * This function removes input handle from device's | |
2035 | * and handler's lists. | |
2036 | * | |
2037 | * This function is supposed to be called from handler's | |
2038 | * disconnect() method. | |
2039 | */ | |
5b2a0826 DT |
2040 | void input_unregister_handle(struct input_handle *handle) |
2041 | { | |
8006479c DT |
2042 | struct input_dev *dev = handle->dev; |
2043 | ||
66d2a595 | 2044 | list_del_rcu(&handle->h_node); |
8006479c DT |
2045 | |
2046 | /* | |
2047 | * Take dev->mutex to prevent race with input_release_device(). | |
2048 | */ | |
2049 | mutex_lock(&dev->mutex); | |
2050 | list_del_rcu(&handle->d_node); | |
2051 | mutex_unlock(&dev->mutex); | |
66d2a595 | 2052 | |
82ba56c2 | 2053 | synchronize_rcu(); |
5b2a0826 DT |
2054 | } |
2055 | EXPORT_SYMBOL(input_unregister_handle); | |
2056 | ||
1da177e4 LT |
2057 | static int input_open_file(struct inode *inode, struct file *file) |
2058 | { | |
2edbf853 | 2059 | struct input_handler *handler; |
99ac48f5 | 2060 | const struct file_operations *old_fops, *new_fops = NULL; |
1da177e4 LT |
2061 | int err; |
2062 | ||
2f2177c8 AB |
2063 | err = mutex_lock_interruptible(&input_mutex); |
2064 | if (err) | |
2065 | return err; | |
2066 | ||
1da177e4 | 2067 | /* No load-on-demand here? */ |
2edbf853 | 2068 | handler = input_table[iminor(inode) >> 5]; |
2f2177c8 AB |
2069 | if (handler) |
2070 | new_fops = fops_get(handler->fops); | |
2071 | ||
2072 | mutex_unlock(&input_mutex); | |
1da177e4 LT |
2073 | |
2074 | /* | |
2075 | * That's _really_ odd. Usually NULL ->open means "nothing special", | |
2076 | * not "no device". Oh, well... | |
2077 | */ | |
2f2177c8 | 2078 | if (!new_fops || !new_fops->open) { |
1da177e4 | 2079 | fops_put(new_fops); |
2edbf853 JC |
2080 | err = -ENODEV; |
2081 | goto out; | |
1da177e4 | 2082 | } |
2f2177c8 | 2083 | |
1da177e4 LT |
2084 | old_fops = file->f_op; |
2085 | file->f_op = new_fops; | |
2086 | ||
2087 | err = new_fops->open(inode, file); | |
1da177e4 LT |
2088 | if (err) { |
2089 | fops_put(file->f_op); | |
2090 | file->f_op = fops_get(old_fops); | |
2091 | } | |
2092 | fops_put(old_fops); | |
2edbf853 | 2093 | out: |
1da177e4 LT |
2094 | return err; |
2095 | } | |
2096 | ||
2b8693c0 | 2097 | static const struct file_operations input_fops = { |
1da177e4 LT |
2098 | .owner = THIS_MODULE, |
2099 | .open = input_open_file, | |
6038f373 | 2100 | .llseek = noop_llseek, |
1da177e4 LT |
2101 | }; |
2102 | ||
f96b434d | 2103 | static int __init input_init(void) |
1da177e4 | 2104 | { |
f96b434d | 2105 | int err; |
1da177e4 | 2106 | |
ea9f240b | 2107 | err = class_register(&input_class); |
d19fbe8a DT |
2108 | if (err) { |
2109 | printk(KERN_ERR "input: unable to register input_dev class\n"); | |
2110 | return err; | |
2111 | } | |
2112 | ||
f96b434d DT |
2113 | err = input_proc_init(); |
2114 | if (err) | |
b0fdfebb | 2115 | goto fail1; |
1da177e4 | 2116 | |
f96b434d DT |
2117 | err = register_chrdev(INPUT_MAJOR, "input", &input_fops); |
2118 | if (err) { | |
2119 | printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR); | |
b0fdfebb | 2120 | goto fail2; |
1da177e4 | 2121 | } |
e334016f | 2122 | |
1da177e4 | 2123 | return 0; |
1da177e4 | 2124 | |
b0fdfebb | 2125 | fail2: input_proc_exit(); |
ea9f240b | 2126 | fail1: class_unregister(&input_class); |
f96b434d | 2127 | return err; |
1da177e4 LT |
2128 | } |
2129 | ||
2130 | static void __exit input_exit(void) | |
2131 | { | |
f96b434d | 2132 | input_proc_exit(); |
1da177e4 | 2133 | unregister_chrdev(INPUT_MAJOR, "input"); |
ea9f240b | 2134 | class_unregister(&input_class); |
1da177e4 LT |
2135 | } |
2136 | ||
2137 | subsys_initcall(input_init); | |
2138 | module_exit(input_exit); |