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 | ||
13 | #include <linux/init.h> | |
1da177e4 LT |
14 | #include <linux/input.h> |
15 | #include <linux/module.h> | |
16 | #include <linux/random.h> | |
17 | #include <linux/major.h> | |
18 | #include <linux/proc_fs.h> | |
969b21cd | 19 | #include <linux/seq_file.h> |
1da177e4 LT |
20 | #include <linux/poll.h> |
21 | #include <linux/device.h> | |
e676c232 | 22 | #include <linux/mutex.h> |
8006479c | 23 | #include <linux/rcupdate.h> |
2edbf853 | 24 | #include <linux/smp_lock.h> |
1da177e4 LT |
25 | |
26 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>"); | |
27 | MODULE_DESCRIPTION("Input core"); | |
28 | MODULE_LICENSE("GPL"); | |
29 | ||
1da177e4 LT |
30 | #define INPUT_DEVICES 256 |
31 | ||
32 | static LIST_HEAD(input_dev_list); | |
33 | static LIST_HEAD(input_handler_list); | |
34 | ||
8006479c DT |
35 | /* |
36 | * input_mutex protects access to both input_dev_list and input_handler_list. | |
37 | * This also causes input_[un]register_device and input_[un]register_handler | |
38 | * be mutually exclusive which simplifies locking in drivers implementing | |
39 | * input handlers. | |
40 | */ | |
41 | static DEFINE_MUTEX(input_mutex); | |
42 | ||
1da177e4 LT |
43 | static struct input_handler *input_table[8]; |
44 | ||
8006479c DT |
45 | static inline int is_event_supported(unsigned int code, |
46 | unsigned long *bm, unsigned int max) | |
1da177e4 | 47 | { |
8006479c DT |
48 | return code <= max && test_bit(code, bm); |
49 | } | |
1da177e4 | 50 | |
8006479c DT |
51 | static int input_defuzz_abs_event(int value, int old_val, int fuzz) |
52 | { | |
53 | if (fuzz) { | |
54 | if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2) | |
55 | return old_val; | |
1da177e4 | 56 | |
8006479c DT |
57 | if (value > old_val - fuzz && value < old_val + fuzz) |
58 | return (old_val * 3 + value) / 4; | |
1da177e4 | 59 | |
8006479c DT |
60 | if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2) |
61 | return (old_val + value) / 2; | |
62 | } | |
1da177e4 | 63 | |
8006479c DT |
64 | return value; |
65 | } | |
1da177e4 | 66 | |
8006479c DT |
67 | /* |
68 | * Pass event through all open handles. This function is called with | |
82ba56c2 | 69 | * dev->event_lock held and interrupts disabled. |
8006479c DT |
70 | */ |
71 | static void input_pass_event(struct input_dev *dev, | |
72 | unsigned int type, unsigned int code, int value) | |
73 | { | |
82ba56c2 DT |
74 | struct input_handle *handle; |
75 | ||
76 | rcu_read_lock(); | |
1da177e4 | 77 | |
82ba56c2 | 78 | handle = rcu_dereference(dev->grab); |
8006479c DT |
79 | if (handle) |
80 | handle->handler->event(handle, type, code, value); | |
81 | else | |
82 | list_for_each_entry_rcu(handle, &dev->h_list, d_node) | |
83 | if (handle->open) | |
84 | handle->handler->event(handle, | |
85 | type, code, value); | |
82ba56c2 | 86 | rcu_read_unlock(); |
8006479c | 87 | } |
1da177e4 | 88 | |
8006479c DT |
89 | /* |
90 | * Generate software autorepeat event. Note that we take | |
91 | * dev->event_lock here to avoid racing with input_event | |
92 | * which may cause keys get "stuck". | |
93 | */ | |
94 | static void input_repeat_key(unsigned long data) | |
95 | { | |
96 | struct input_dev *dev = (void *) data; | |
97 | unsigned long flags; | |
1da177e4 | 98 | |
8006479c | 99 | spin_lock_irqsave(&dev->event_lock, flags); |
1da177e4 | 100 | |
8006479c DT |
101 | if (test_bit(dev->repeat_key, dev->key) && |
102 | is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) { | |
1da177e4 | 103 | |
8006479c | 104 | input_pass_event(dev, EV_KEY, dev->repeat_key, 2); |
1da177e4 | 105 | |
8006479c DT |
106 | if (dev->sync) { |
107 | /* | |
108 | * Only send SYN_REPORT if we are not in a middle | |
109 | * of driver parsing a new hardware packet. | |
110 | * Otherwise assume that the driver will send | |
111 | * SYN_REPORT once it's done. | |
112 | */ | |
113 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
114 | } | |
31581066 | 115 | |
8006479c DT |
116 | if (dev->rep[REP_PERIOD]) |
117 | mod_timer(&dev->timer, jiffies + | |
118 | msecs_to_jiffies(dev->rep[REP_PERIOD])); | |
119 | } | |
31581066 | 120 | |
8006479c DT |
121 | spin_unlock_irqrestore(&dev->event_lock, flags); |
122 | } | |
31581066 | 123 | |
8006479c DT |
124 | static void input_start_autorepeat(struct input_dev *dev, int code) |
125 | { | |
126 | if (test_bit(EV_REP, dev->evbit) && | |
127 | dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && | |
128 | dev->timer.data) { | |
129 | dev->repeat_key = code; | |
130 | mod_timer(&dev->timer, | |
131 | jiffies + msecs_to_jiffies(dev->rep[REP_DELAY])); | |
132 | } | |
133 | } | |
31581066 | 134 | |
8006479c DT |
135 | #define INPUT_IGNORE_EVENT 0 |
136 | #define INPUT_PASS_TO_HANDLERS 1 | |
137 | #define INPUT_PASS_TO_DEVICE 2 | |
138 | #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE) | |
1da177e4 | 139 | |
8006479c DT |
140 | static void input_handle_event(struct input_dev *dev, |
141 | unsigned int type, unsigned int code, int value) | |
142 | { | |
143 | int disposition = INPUT_IGNORE_EVENT; | |
1da177e4 | 144 | |
8006479c | 145 | switch (type) { |
1da177e4 | 146 | |
8006479c DT |
147 | case EV_SYN: |
148 | switch (code) { | |
149 | case SYN_CONFIG: | |
150 | disposition = INPUT_PASS_TO_ALL; | |
151 | break; | |
1da177e4 | 152 | |
8006479c DT |
153 | case SYN_REPORT: |
154 | if (!dev->sync) { | |
155 | dev->sync = 1; | |
156 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 157 | } |
1da177e4 | 158 | break; |
8006479c DT |
159 | } |
160 | break; | |
1da177e4 | 161 | |
8006479c DT |
162 | case EV_KEY: |
163 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
164 | !!test_bit(code, dev->key) != value) { | |
1da177e4 | 165 | |
8006479c DT |
166 | if (value != 2) { |
167 | __change_bit(code, dev->key); | |
168 | if (value) | |
169 | input_start_autorepeat(dev, code); | |
170 | } | |
1da177e4 | 171 | |
8006479c DT |
172 | disposition = INPUT_PASS_TO_HANDLERS; |
173 | } | |
174 | break; | |
1da177e4 | 175 | |
8006479c DT |
176 | case EV_SW: |
177 | if (is_event_supported(code, dev->swbit, SW_MAX) && | |
178 | !!test_bit(code, dev->sw) != value) { | |
1da177e4 | 179 | |
8006479c DT |
180 | __change_bit(code, dev->sw); |
181 | disposition = INPUT_PASS_TO_HANDLERS; | |
182 | } | |
183 | break; | |
1da177e4 | 184 | |
8006479c DT |
185 | case EV_ABS: |
186 | if (is_event_supported(code, dev->absbit, ABS_MAX)) { | |
1da177e4 | 187 | |
8006479c DT |
188 | value = input_defuzz_abs_event(value, |
189 | dev->abs[code], dev->absfuzz[code]); | |
1da177e4 | 190 | |
8006479c DT |
191 | if (dev->abs[code] != value) { |
192 | dev->abs[code] = value; | |
193 | disposition = INPUT_PASS_TO_HANDLERS; | |
194 | } | |
195 | } | |
196 | break; | |
1da177e4 | 197 | |
8006479c DT |
198 | case EV_REL: |
199 | if (is_event_supported(code, dev->relbit, REL_MAX) && value) | |
200 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 201 | |
8006479c | 202 | break; |
1e0afb28 | 203 | |
8006479c DT |
204 | case EV_MSC: |
205 | if (is_event_supported(code, dev->mscbit, MSC_MAX)) | |
206 | disposition = INPUT_PASS_TO_ALL; | |
1da177e4 | 207 | |
8006479c | 208 | break; |
1da177e4 | 209 | |
8006479c DT |
210 | case EV_LED: |
211 | if (is_event_supported(code, dev->ledbit, LED_MAX) && | |
212 | !!test_bit(code, dev->led) != value) { | |
1da177e4 | 213 | |
8006479c DT |
214 | __change_bit(code, dev->led); |
215 | disposition = INPUT_PASS_TO_ALL; | |
216 | } | |
217 | break; | |
218 | ||
219 | case EV_SND: | |
220 | if (is_event_supported(code, dev->sndbit, SND_MAX)) { | |
1da177e4 | 221 | |
8fdc1948 | 222 | if (!!test_bit(code, dev->snd) != !!value) |
8006479c DT |
223 | __change_bit(code, dev->snd); |
224 | disposition = INPUT_PASS_TO_ALL; | |
225 | } | |
226 | break; | |
8fdc1948 | 227 | |
8006479c DT |
228 | case EV_REP: |
229 | if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) { | |
230 | dev->rep[code] = value; | |
231 | disposition = INPUT_PASS_TO_ALL; | |
232 | } | |
233 | break; | |
1da177e4 | 234 | |
8006479c DT |
235 | case EV_FF: |
236 | if (value >= 0) | |
237 | disposition = INPUT_PASS_TO_ALL; | |
238 | break; | |
ed2fa4dd RP |
239 | |
240 | case EV_PWR: | |
241 | disposition = INPUT_PASS_TO_ALL; | |
242 | break; | |
8006479c | 243 | } |
1da177e4 | 244 | |
c9812282 | 245 | if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN) |
8006479c | 246 | dev->sync = 0; |
1da177e4 | 247 | |
8006479c DT |
248 | if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event) |
249 | dev->event(dev, type, code, value); | |
1da177e4 | 250 | |
8006479c DT |
251 | if (disposition & INPUT_PASS_TO_HANDLERS) |
252 | input_pass_event(dev, type, code, value); | |
253 | } | |
1da177e4 | 254 | |
8006479c DT |
255 | /** |
256 | * input_event() - report new input event | |
257 | * @dev: device that generated the event | |
258 | * @type: type of the event | |
259 | * @code: event code | |
260 | * @value: value of the event | |
261 | * | |
262 | * This function should be used by drivers implementing various input | |
263 | * devices. See also input_inject_event(). | |
264 | */ | |
1da177e4 | 265 | |
8006479c DT |
266 | void input_event(struct input_dev *dev, |
267 | unsigned int type, unsigned int code, int value) | |
268 | { | |
269 | unsigned long flags; | |
509ca1a9 | 270 | |
8006479c | 271 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
509ca1a9 | 272 | |
8006479c DT |
273 | spin_lock_irqsave(&dev->event_lock, flags); |
274 | add_input_randomness(type, code, value); | |
275 | input_handle_event(dev, type, code, value); | |
276 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1da177e4 | 277 | } |
1da177e4 | 278 | } |
ca56fe07 | 279 | EXPORT_SYMBOL(input_event); |
1da177e4 | 280 | |
0e739d28 DT |
281 | /** |
282 | * input_inject_event() - send input event from input handler | |
283 | * @handle: input handle to send event through | |
284 | * @type: type of the event | |
285 | * @code: event code | |
286 | * @value: value of the event | |
287 | * | |
8006479c DT |
288 | * Similar to input_event() but will ignore event if device is |
289 | * "grabbed" and handle injecting event is not the one that owns | |
290 | * the device. | |
0e739d28 | 291 | */ |
8006479c DT |
292 | void input_inject_event(struct input_handle *handle, |
293 | unsigned int type, unsigned int code, int value) | |
1da177e4 | 294 | { |
8006479c DT |
295 | struct input_dev *dev = handle->dev; |
296 | struct input_handle *grab; | |
297 | unsigned long flags; | |
1da177e4 | 298 | |
8006479c DT |
299 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
300 | spin_lock_irqsave(&dev->event_lock, flags); | |
1da177e4 | 301 | |
82ba56c2 | 302 | rcu_read_lock(); |
8006479c DT |
303 | grab = rcu_dereference(dev->grab); |
304 | if (!grab || grab == handle) | |
305 | input_handle_event(dev, type, code, value); | |
82ba56c2 | 306 | rcu_read_unlock(); |
1da177e4 | 307 | |
8006479c DT |
308 | spin_unlock_irqrestore(&dev->event_lock, flags); |
309 | } | |
1da177e4 | 310 | } |
8006479c | 311 | EXPORT_SYMBOL(input_inject_event); |
1da177e4 | 312 | |
8006479c DT |
313 | /** |
314 | * input_grab_device - grabs device for exclusive use | |
315 | * @handle: input handle that wants to own the device | |
316 | * | |
317 | * When a device is grabbed by an input handle all events generated by | |
318 | * the device are delivered only to this handle. Also events injected | |
319 | * by other input handles are ignored while device is grabbed. | |
320 | */ | |
1da177e4 LT |
321 | int input_grab_device(struct input_handle *handle) |
322 | { | |
8006479c DT |
323 | struct input_dev *dev = handle->dev; |
324 | int retval; | |
1da177e4 | 325 | |
8006479c DT |
326 | retval = mutex_lock_interruptible(&dev->mutex); |
327 | if (retval) | |
328 | return retval; | |
329 | ||
330 | if (dev->grab) { | |
331 | retval = -EBUSY; | |
332 | goto out; | |
333 | } | |
334 | ||
335 | rcu_assign_pointer(dev->grab, handle); | |
82ba56c2 | 336 | synchronize_rcu(); |
8006479c DT |
337 | |
338 | out: | |
339 | mutex_unlock(&dev->mutex); | |
340 | return retval; | |
1da177e4 | 341 | } |
ca56fe07 | 342 | EXPORT_SYMBOL(input_grab_device); |
1da177e4 | 343 | |
8006479c | 344 | static void __input_release_device(struct input_handle *handle) |
1da177e4 | 345 | { |
a2b2ed2c | 346 | struct input_dev *dev = handle->dev; |
c7e8dc6e | 347 | |
a2b2ed2c | 348 | if (dev->grab == handle) { |
8006479c DT |
349 | rcu_assign_pointer(dev->grab, NULL); |
350 | /* Make sure input_pass_event() notices that grab is gone */ | |
82ba56c2 | 351 | synchronize_rcu(); |
a2b2ed2c AM |
352 | |
353 | list_for_each_entry(handle, &dev->h_list, d_node) | |
8006479c | 354 | if (handle->open && handle->handler->start) |
c7e8dc6e DT |
355 | handle->handler->start(handle); |
356 | } | |
1da177e4 | 357 | } |
8006479c DT |
358 | |
359 | /** | |
360 | * input_release_device - release previously grabbed device | |
361 | * @handle: input handle that owns the device | |
362 | * | |
363 | * Releases previously grabbed device so that other input handles can | |
364 | * start receiving input events. Upon release all handlers attached | |
365 | * to the device have their start() method called so they have a change | |
366 | * to synchronize device state with the rest of the system. | |
367 | */ | |
368 | void input_release_device(struct input_handle *handle) | |
369 | { | |
370 | struct input_dev *dev = handle->dev; | |
371 | ||
372 | mutex_lock(&dev->mutex); | |
373 | __input_release_device(handle); | |
374 | mutex_unlock(&dev->mutex); | |
375 | } | |
ca56fe07 | 376 | EXPORT_SYMBOL(input_release_device); |
1da177e4 | 377 | |
8006479c DT |
378 | /** |
379 | * input_open_device - open input device | |
380 | * @handle: handle through which device is being accessed | |
381 | * | |
382 | * This function should be called by input handlers when they | |
383 | * want to start receive events from given input device. | |
384 | */ | |
1da177e4 LT |
385 | int input_open_device(struct input_handle *handle) |
386 | { | |
0fbf87ca | 387 | struct input_dev *dev = handle->dev; |
8006479c | 388 | int retval; |
0fbf87ca | 389 | |
8006479c DT |
390 | retval = mutex_lock_interruptible(&dev->mutex); |
391 | if (retval) | |
392 | return retval; | |
393 | ||
394 | if (dev->going_away) { | |
395 | retval = -ENODEV; | |
396 | goto out; | |
397 | } | |
0fbf87ca | 398 | |
1da177e4 | 399 | handle->open++; |
0fbf87ca DT |
400 | |
401 | if (!dev->users++ && dev->open) | |
8006479c DT |
402 | retval = dev->open(dev); |
403 | ||
404 | if (retval) { | |
405 | dev->users--; | |
406 | if (!--handle->open) { | |
407 | /* | |
408 | * Make sure we are not delivering any more events | |
409 | * through this handle | |
410 | */ | |
82ba56c2 | 411 | synchronize_rcu(); |
8006479c DT |
412 | } |
413 | } | |
0fbf87ca | 414 | |
8006479c | 415 | out: |
e676c232 | 416 | mutex_unlock(&dev->mutex); |
8006479c | 417 | return retval; |
1da177e4 | 418 | } |
ca56fe07 | 419 | EXPORT_SYMBOL(input_open_device); |
1da177e4 | 420 | |
8006479c | 421 | int input_flush_device(struct input_handle *handle, struct file *file) |
1da177e4 | 422 | { |
8006479c DT |
423 | struct input_dev *dev = handle->dev; |
424 | int retval; | |
1da177e4 | 425 | |
8006479c DT |
426 | retval = mutex_lock_interruptible(&dev->mutex); |
427 | if (retval) | |
428 | return retval; | |
429 | ||
430 | if (dev->flush) | |
431 | retval = dev->flush(dev, file); | |
432 | ||
433 | mutex_unlock(&dev->mutex); | |
434 | return retval; | |
1da177e4 | 435 | } |
ca56fe07 | 436 | EXPORT_SYMBOL(input_flush_device); |
1da177e4 | 437 | |
8006479c DT |
438 | /** |
439 | * input_close_device - close input device | |
440 | * @handle: handle through which device is being accessed | |
441 | * | |
442 | * This function should be called by input handlers when they | |
443 | * want to stop receive events from given input device. | |
444 | */ | |
1da177e4 LT |
445 | void input_close_device(struct input_handle *handle) |
446 | { | |
0fbf87ca DT |
447 | struct input_dev *dev = handle->dev; |
448 | ||
e676c232 | 449 | mutex_lock(&dev->mutex); |
0fbf87ca | 450 | |
8006479c DT |
451 | __input_release_device(handle); |
452 | ||
0fbf87ca DT |
453 | if (!--dev->users && dev->close) |
454 | dev->close(dev); | |
8006479c DT |
455 | |
456 | if (!--handle->open) { | |
457 | /* | |
82ba56c2 | 458 | * synchronize_rcu() makes sure that input_pass_event() |
8006479c DT |
459 | * completed and that no more input events are delivered |
460 | * through this handle | |
461 | */ | |
82ba56c2 | 462 | synchronize_rcu(); |
8006479c | 463 | } |
0fbf87ca | 464 | |
e676c232 | 465 | mutex_unlock(&dev->mutex); |
1da177e4 | 466 | } |
ca56fe07 | 467 | EXPORT_SYMBOL(input_close_device); |
1da177e4 | 468 | |
8006479c DT |
469 | /* |
470 | * Prepare device for unregistering | |
471 | */ | |
472 | static void input_disconnect_device(struct input_dev *dev) | |
473 | { | |
474 | struct input_handle *handle; | |
475 | int code; | |
476 | ||
477 | /* | |
478 | * Mark device as going away. Note that we take dev->mutex here | |
479 | * not to protect access to dev->going_away but rather to ensure | |
480 | * that there are no threads in the middle of input_open_device() | |
481 | */ | |
482 | mutex_lock(&dev->mutex); | |
483 | dev->going_away = 1; | |
484 | mutex_unlock(&dev->mutex); | |
485 | ||
486 | spin_lock_irq(&dev->event_lock); | |
487 | ||
488 | /* | |
489 | * Simulate keyup events for all pressed keys so that handlers | |
490 | * are not left with "stuck" keys. The driver may continue | |
491 | * generate events even after we done here but they will not | |
492 | * reach any handlers. | |
493 | */ | |
494 | if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) { | |
495 | for (code = 0; code <= KEY_MAX; code++) { | |
496 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
f4f37c8e | 497 | __test_and_clear_bit(code, dev->key)) { |
8006479c DT |
498 | input_pass_event(dev, EV_KEY, code, 0); |
499 | } | |
500 | } | |
501 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
502 | } | |
503 | ||
504 | list_for_each_entry(handle, &dev->h_list, d_node) | |
505 | handle->open = 0; | |
506 | ||
507 | spin_unlock_irq(&dev->event_lock); | |
508 | } | |
509 | ||
c8e4c772 MR |
510 | static int input_fetch_keycode(struct input_dev *dev, int scancode) |
511 | { | |
512 | switch (dev->keycodesize) { | |
513 | case 1: | |
514 | return ((u8 *)dev->keycode)[scancode]; | |
515 | ||
516 | case 2: | |
517 | return ((u16 *)dev->keycode)[scancode]; | |
518 | ||
519 | default: | |
520 | return ((u32 *)dev->keycode)[scancode]; | |
521 | } | |
522 | } | |
523 | ||
524 | static int input_default_getkeycode(struct input_dev *dev, | |
525 | int scancode, int *keycode) | |
526 | { | |
527 | if (!dev->keycodesize) | |
528 | return -EINVAL; | |
529 | ||
f4f37c8e | 530 | if (scancode >= dev->keycodemax) |
c8e4c772 MR |
531 | return -EINVAL; |
532 | ||
533 | *keycode = input_fetch_keycode(dev, scancode); | |
534 | ||
535 | return 0; | |
536 | } | |
537 | ||
538 | static int input_default_setkeycode(struct input_dev *dev, | |
539 | int scancode, int keycode) | |
540 | { | |
541 | int old_keycode; | |
542 | int i; | |
543 | ||
f4f37c8e | 544 | if (scancode >= dev->keycodemax) |
c8e4c772 MR |
545 | return -EINVAL; |
546 | ||
547 | if (!dev->keycodesize) | |
548 | return -EINVAL; | |
549 | ||
550 | if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8))) | |
551 | return -EINVAL; | |
552 | ||
553 | switch (dev->keycodesize) { | |
554 | case 1: { | |
555 | u8 *k = (u8 *)dev->keycode; | |
556 | old_keycode = k[scancode]; | |
557 | k[scancode] = keycode; | |
558 | break; | |
559 | } | |
560 | case 2: { | |
561 | u16 *k = (u16 *)dev->keycode; | |
562 | old_keycode = k[scancode]; | |
563 | k[scancode] = keycode; | |
564 | break; | |
565 | } | |
566 | default: { | |
567 | u32 *k = (u32 *)dev->keycode; | |
568 | old_keycode = k[scancode]; | |
569 | k[scancode] = keycode; | |
570 | break; | |
571 | } | |
572 | } | |
573 | ||
574 | clear_bit(old_keycode, dev->keybit); | |
575 | set_bit(keycode, dev->keybit); | |
576 | ||
577 | for (i = 0; i < dev->keycodemax; i++) { | |
578 | if (input_fetch_keycode(dev, i) == old_keycode) { | |
579 | set_bit(old_keycode, dev->keybit); | |
580 | break; /* Setting the bit twice is useless, so break */ | |
581 | } | |
582 | } | |
583 | ||
584 | return 0; | |
585 | } | |
586 | ||
f4f37c8e DT |
587 | /** |
588 | * input_get_keycode - retrieve keycode currently mapped to a given scancode | |
589 | * @dev: input device which keymap is being queried | |
590 | * @scancode: scancode (or its equivalent for device in question) for which | |
591 | * keycode is needed | |
592 | * @keycode: result | |
593 | * | |
594 | * This function should be called by anyone interested in retrieving current | |
595 | * keymap. Presently keyboard and evdev handlers use it. | |
596 | */ | |
597 | int input_get_keycode(struct input_dev *dev, int scancode, int *keycode) | |
598 | { | |
599 | if (scancode < 0) | |
600 | return -EINVAL; | |
601 | ||
602 | return dev->getkeycode(dev, scancode, keycode); | |
603 | } | |
604 | EXPORT_SYMBOL(input_get_keycode); | |
605 | ||
606 | /** | |
607 | * input_get_keycode - assign new keycode to a given scancode | |
608 | * @dev: input device which keymap is being updated | |
609 | * @scancode: scancode (or its equivalent for device in question) | |
610 | * @keycode: new keycode to be assigned to the scancode | |
611 | * | |
612 | * This function should be called by anyone needing to update current | |
613 | * keymap. Presently keyboard and evdev handlers use it. | |
614 | */ | |
615 | int input_set_keycode(struct input_dev *dev, int scancode, int keycode) | |
616 | { | |
617 | unsigned long flags; | |
618 | int old_keycode; | |
619 | int retval; | |
620 | ||
621 | if (scancode < 0) | |
622 | return -EINVAL; | |
623 | ||
624 | if (keycode < 0 || keycode > KEY_MAX) | |
625 | return -EINVAL; | |
626 | ||
627 | spin_lock_irqsave(&dev->event_lock, flags); | |
628 | ||
629 | retval = dev->getkeycode(dev, scancode, &old_keycode); | |
630 | if (retval) | |
631 | goto out; | |
632 | ||
633 | retval = dev->setkeycode(dev, scancode, keycode); | |
634 | if (retval) | |
635 | goto out; | |
636 | ||
637 | /* | |
638 | * Simulate keyup event if keycode is not present | |
639 | * in the keymap anymore | |
640 | */ | |
641 | if (test_bit(EV_KEY, dev->evbit) && | |
642 | !is_event_supported(old_keycode, dev->keybit, KEY_MAX) && | |
643 | __test_and_clear_bit(old_keycode, dev->key)) { | |
644 | ||
645 | input_pass_event(dev, EV_KEY, old_keycode, 0); | |
646 | if (dev->sync) | |
647 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
648 | } | |
649 | ||
650 | out: | |
651 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
652 | ||
653 | return retval; | |
654 | } | |
655 | EXPORT_SYMBOL(input_set_keycode); | |
c8e4c772 | 656 | |
1da177e4 | 657 | #define MATCH_BIT(bit, max) \ |
7b19ada2 | 658 | for (i = 0; i < BITS_TO_LONGS(max); i++) \ |
1da177e4 LT |
659 | if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \ |
660 | break; \ | |
7b19ada2 | 661 | if (i != BITS_TO_LONGS(max)) \ |
1da177e4 LT |
662 | continue; |
663 | ||
66e66118 DT |
664 | static const struct input_device_id *input_match_device(const struct input_device_id *id, |
665 | struct input_dev *dev) | |
1da177e4 LT |
666 | { |
667 | int i; | |
668 | ||
669 | for (; id->flags || id->driver_info; id++) { | |
670 | ||
671 | if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) | |
ddc5d341 | 672 | if (id->bustype != dev->id.bustype) |
1da177e4 LT |
673 | continue; |
674 | ||
675 | if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) | |
ddc5d341 | 676 | if (id->vendor != dev->id.vendor) |
1da177e4 LT |
677 | continue; |
678 | ||
679 | if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) | |
ddc5d341 | 680 | if (id->product != dev->id.product) |
1da177e4 LT |
681 | continue; |
682 | ||
683 | if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) | |
ddc5d341 | 684 | if (id->version != dev->id.version) |
1da177e4 LT |
685 | continue; |
686 | ||
687 | MATCH_BIT(evbit, EV_MAX); | |
688 | MATCH_BIT(keybit, KEY_MAX); | |
689 | MATCH_BIT(relbit, REL_MAX); | |
690 | MATCH_BIT(absbit, ABS_MAX); | |
691 | MATCH_BIT(mscbit, MSC_MAX); | |
692 | MATCH_BIT(ledbit, LED_MAX); | |
693 | MATCH_BIT(sndbit, SND_MAX); | |
694 | MATCH_BIT(ffbit, FF_MAX); | |
ff13f98b | 695 | MATCH_BIT(swbit, SW_MAX); |
1da177e4 LT |
696 | |
697 | return id; | |
698 | } | |
699 | ||
700 | return NULL; | |
701 | } | |
702 | ||
5b2a0826 DT |
703 | static int input_attach_handler(struct input_dev *dev, struct input_handler *handler) |
704 | { | |
705 | const struct input_device_id *id; | |
706 | int error; | |
707 | ||
708 | if (handler->blacklist && input_match_device(handler->blacklist, dev)) | |
709 | return -ENODEV; | |
710 | ||
711 | id = input_match_device(handler->id_table, dev); | |
712 | if (!id) | |
713 | return -ENODEV; | |
714 | ||
715 | error = handler->connect(handler, dev, id); | |
716 | if (error && error != -ENODEV) | |
717 | printk(KERN_ERR | |
718 | "input: failed to attach handler %s to device %s, " | |
719 | "error: %d\n", | |
9657d75c | 720 | handler->name, kobject_name(&dev->dev.kobj), error); |
5b2a0826 DT |
721 | |
722 | return error; | |
723 | } | |
724 | ||
725 | ||
f96b434d DT |
726 | #ifdef CONFIG_PROC_FS |
727 | ||
728 | static struct proc_dir_entry *proc_bus_input_dir; | |
729 | static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); | |
730 | static int input_devices_state; | |
731 | ||
732 | static inline void input_wakeup_procfs_readers(void) | |
733 | { | |
734 | input_devices_state++; | |
735 | wake_up(&input_devices_poll_wait); | |
736 | } | |
737 | ||
969b21cd | 738 | static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait) |
f96b434d DT |
739 | { |
740 | int state = input_devices_state; | |
1e0afb28 | 741 | |
f96b434d DT |
742 | poll_wait(file, &input_devices_poll_wait, wait); |
743 | if (state != input_devices_state) | |
744 | return POLLIN | POLLRDNORM; | |
1e0afb28 | 745 | |
f96b434d DT |
746 | return 0; |
747 | } | |
748 | ||
969b21cd DT |
749 | static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) |
750 | { | |
8006479c DT |
751 | if (mutex_lock_interruptible(&input_mutex)) |
752 | return NULL; | |
f96b434d | 753 | |
ad5d972c | 754 | return seq_list_start(&input_dev_list, *pos); |
969b21cd | 755 | } |
051b2fea | 756 | |
969b21cd DT |
757 | static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
758 | { | |
ad5d972c | 759 | return seq_list_next(v, &input_dev_list, pos); |
969b21cd | 760 | } |
f96b434d | 761 | |
969b21cd DT |
762 | static void input_devices_seq_stop(struct seq_file *seq, void *v) |
763 | { | |
8006479c | 764 | mutex_unlock(&input_mutex); |
969b21cd | 765 | } |
f96b434d | 766 | |
969b21cd DT |
767 | static void input_seq_print_bitmap(struct seq_file *seq, const char *name, |
768 | unsigned long *bitmap, int max) | |
769 | { | |
770 | int i; | |
051b2fea | 771 | |
7b19ada2 | 772 | for (i = BITS_TO_LONGS(max) - 1; i > 0; i--) |
969b21cd DT |
773 | if (bitmap[i]) |
774 | break; | |
f96b434d | 775 | |
969b21cd DT |
776 | seq_printf(seq, "B: %s=", name); |
777 | for (; i >= 0; i--) | |
778 | seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : ""); | |
779 | seq_putc(seq, '\n'); | |
780 | } | |
f96b434d | 781 | |
969b21cd DT |
782 | static int input_devices_seq_show(struct seq_file *seq, void *v) |
783 | { | |
784 | struct input_dev *dev = container_of(v, struct input_dev, node); | |
9657d75c | 785 | const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
969b21cd DT |
786 | struct input_handle *handle; |
787 | ||
788 | seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", | |
789 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); | |
790 | ||
791 | seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); | |
792 | seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : ""); | |
793 | seq_printf(seq, "S: Sysfs=%s\n", path ? path : ""); | |
15e03ae8 | 794 | seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : ""); |
969b21cd DT |
795 | seq_printf(seq, "H: Handlers="); |
796 | ||
797 | list_for_each_entry(handle, &dev->h_list, d_node) | |
798 | seq_printf(seq, "%s ", handle->name); | |
799 | seq_putc(seq, '\n'); | |
800 | ||
801 | input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); | |
802 | if (test_bit(EV_KEY, dev->evbit)) | |
803 | input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); | |
804 | if (test_bit(EV_REL, dev->evbit)) | |
805 | input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); | |
806 | if (test_bit(EV_ABS, dev->evbit)) | |
807 | input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); | |
808 | if (test_bit(EV_MSC, dev->evbit)) | |
809 | input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); | |
810 | if (test_bit(EV_LED, dev->evbit)) | |
811 | input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); | |
812 | if (test_bit(EV_SND, dev->evbit)) | |
813 | input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); | |
814 | if (test_bit(EV_FF, dev->evbit)) | |
815 | input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); | |
816 | if (test_bit(EV_SW, dev->evbit)) | |
817 | input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); | |
818 | ||
819 | seq_putc(seq, '\n'); | |
820 | ||
821 | kfree(path); | |
822 | return 0; | |
f96b434d DT |
823 | } |
824 | ||
cec69c37 | 825 | static const struct seq_operations input_devices_seq_ops = { |
969b21cd DT |
826 | .start = input_devices_seq_start, |
827 | .next = input_devices_seq_next, | |
828 | .stop = input_devices_seq_stop, | |
829 | .show = input_devices_seq_show, | |
830 | }; | |
831 | ||
832 | static int input_proc_devices_open(struct inode *inode, struct file *file) | |
f96b434d | 833 | { |
969b21cd DT |
834 | return seq_open(file, &input_devices_seq_ops); |
835 | } | |
836 | ||
2b8693c0 | 837 | static const struct file_operations input_devices_fileops = { |
969b21cd DT |
838 | .owner = THIS_MODULE, |
839 | .open = input_proc_devices_open, | |
840 | .poll = input_proc_devices_poll, | |
841 | .read = seq_read, | |
842 | .llseek = seq_lseek, | |
843 | .release = seq_release, | |
844 | }; | |
845 | ||
846 | static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) | |
847 | { | |
8006479c DT |
848 | if (mutex_lock_interruptible(&input_mutex)) |
849 | return NULL; | |
850 | ||
969b21cd | 851 | seq->private = (void *)(unsigned long)*pos; |
ad5d972c | 852 | return seq_list_start(&input_handler_list, *pos); |
969b21cd | 853 | } |
f96b434d | 854 | |
969b21cd DT |
855 | static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
856 | { | |
857 | seq->private = (void *)(unsigned long)(*pos + 1); | |
ad5d972c | 858 | return seq_list_next(v, &input_handler_list, pos); |
f96b434d DT |
859 | } |
860 | ||
969b21cd DT |
861 | static void input_handlers_seq_stop(struct seq_file *seq, void *v) |
862 | { | |
8006479c | 863 | mutex_unlock(&input_mutex); |
969b21cd DT |
864 | } |
865 | ||
866 | static int input_handlers_seq_show(struct seq_file *seq, void *v) | |
867 | { | |
868 | struct input_handler *handler = container_of(v, struct input_handler, node); | |
869 | ||
870 | seq_printf(seq, "N: Number=%ld Name=%s", | |
871 | (unsigned long)seq->private, handler->name); | |
872 | if (handler->fops) | |
873 | seq_printf(seq, " Minor=%d", handler->minor); | |
874 | seq_putc(seq, '\n'); | |
875 | ||
876 | return 0; | |
877 | } | |
cec69c37 | 878 | static const struct seq_operations input_handlers_seq_ops = { |
969b21cd DT |
879 | .start = input_handlers_seq_start, |
880 | .next = input_handlers_seq_next, | |
881 | .stop = input_handlers_seq_stop, | |
882 | .show = input_handlers_seq_show, | |
883 | }; | |
884 | ||
885 | static int input_proc_handlers_open(struct inode *inode, struct file *file) | |
886 | { | |
887 | return seq_open(file, &input_handlers_seq_ops); | |
888 | } | |
889 | ||
2b8693c0 | 890 | static const struct file_operations input_handlers_fileops = { |
969b21cd DT |
891 | .owner = THIS_MODULE, |
892 | .open = input_proc_handlers_open, | |
893 | .read = seq_read, | |
894 | .llseek = seq_lseek, | |
895 | .release = seq_release, | |
896 | }; | |
f96b434d DT |
897 | |
898 | static int __init input_proc_init(void) | |
899 | { | |
900 | struct proc_dir_entry *entry; | |
901 | ||
9c37066d | 902 | proc_bus_input_dir = proc_mkdir("bus/input", NULL); |
f96b434d DT |
903 | if (!proc_bus_input_dir) |
904 | return -ENOMEM; | |
905 | ||
c7705f34 DL |
906 | entry = proc_create("devices", 0, proc_bus_input_dir, |
907 | &input_devices_fileops); | |
f96b434d DT |
908 | if (!entry) |
909 | goto fail1; | |
910 | ||
c7705f34 DL |
911 | entry = proc_create("handlers", 0, proc_bus_input_dir, |
912 | &input_handlers_fileops); | |
f96b434d DT |
913 | if (!entry) |
914 | goto fail2; | |
915 | ||
f96b434d DT |
916 | return 0; |
917 | ||
918 | fail2: remove_proc_entry("devices", proc_bus_input_dir); | |
9c37066d | 919 | fail1: remove_proc_entry("bus/input", NULL); |
f96b434d DT |
920 | return -ENOMEM; |
921 | } | |
922 | ||
beffbdc2 | 923 | static void input_proc_exit(void) |
f96b434d DT |
924 | { |
925 | remove_proc_entry("devices", proc_bus_input_dir); | |
926 | remove_proc_entry("handlers", proc_bus_input_dir); | |
9c37066d | 927 | remove_proc_entry("bus/input", NULL); |
f96b434d DT |
928 | } |
929 | ||
930 | #else /* !CONFIG_PROC_FS */ | |
931 | static inline void input_wakeup_procfs_readers(void) { } | |
932 | static inline int input_proc_init(void) { return 0; } | |
933 | static inline void input_proc_exit(void) { } | |
934 | #endif | |
935 | ||
9657d75c DT |
936 | #define INPUT_DEV_STRING_ATTR_SHOW(name) \ |
937 | static ssize_t input_dev_show_##name(struct device *dev, \ | |
938 | struct device_attribute *attr, \ | |
939 | char *buf) \ | |
940 | { \ | |
941 | struct input_dev *input_dev = to_input_dev(dev); \ | |
942 | \ | |
943 | return scnprintf(buf, PAGE_SIZE, "%s\n", \ | |
944 | input_dev->name ? input_dev->name : ""); \ | |
945 | } \ | |
946 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL) | |
5c1e9a6a DT |
947 | |
948 | INPUT_DEV_STRING_ATTR_SHOW(name); | |
949 | INPUT_DEV_STRING_ATTR_SHOW(phys); | |
950 | INPUT_DEV_STRING_ATTR_SHOW(uniq); | |
951 | ||
ac648a6a DT |
952 | static int input_print_modalias_bits(char *buf, int size, |
953 | char name, unsigned long *bm, | |
954 | unsigned int min_bit, unsigned int max_bit) | |
1d8f430c | 955 | { |
ac648a6a | 956 | int len = 0, i; |
1d8f430c | 957 | |
ac648a6a DT |
958 | len += snprintf(buf, max(size, 0), "%c", name); |
959 | for (i = min_bit; i < max_bit; i++) | |
7b19ada2 | 960 | if (bm[BIT_WORD(i)] & BIT_MASK(i)) |
ac648a6a | 961 | len += snprintf(buf + len, max(size - len, 0), "%X,", i); |
1d8f430c RR |
962 | return len; |
963 | } | |
964 | ||
2db66876 DT |
965 | static int input_print_modalias(char *buf, int size, struct input_dev *id, |
966 | int add_cr) | |
1d8f430c | 967 | { |
bd37e5a9 | 968 | int len; |
1d8f430c | 969 | |
ac648a6a DT |
970 | len = snprintf(buf, max(size, 0), |
971 | "input:b%04Xv%04Xp%04Xe%04X-", | |
972 | id->id.bustype, id->id.vendor, | |
973 | id->id.product, id->id.version); | |
974 | ||
975 | len += input_print_modalias_bits(buf + len, size - len, | |
976 | 'e', id->evbit, 0, EV_MAX); | |
977 | len += input_print_modalias_bits(buf + len, size - len, | |
978 | 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); | |
979 | len += input_print_modalias_bits(buf + len, size - len, | |
980 | 'r', id->relbit, 0, REL_MAX); | |
981 | len += input_print_modalias_bits(buf + len, size - len, | |
982 | 'a', id->absbit, 0, ABS_MAX); | |
983 | len += input_print_modalias_bits(buf + len, size - len, | |
984 | 'm', id->mscbit, 0, MSC_MAX); | |
985 | len += input_print_modalias_bits(buf + len, size - len, | |
986 | 'l', id->ledbit, 0, LED_MAX); | |
987 | len += input_print_modalias_bits(buf + len, size - len, | |
988 | 's', id->sndbit, 0, SND_MAX); | |
989 | len += input_print_modalias_bits(buf + len, size - len, | |
990 | 'f', id->ffbit, 0, FF_MAX); | |
991 | len += input_print_modalias_bits(buf + len, size - len, | |
992 | 'w', id->swbit, 0, SW_MAX); | |
2db66876 DT |
993 | |
994 | if (add_cr) | |
ac648a6a | 995 | len += snprintf(buf + len, max(size - len, 0), "\n"); |
2db66876 | 996 | |
bd37e5a9 KS |
997 | return len; |
998 | } | |
999 | ||
9657d75c DT |
1000 | static ssize_t input_dev_show_modalias(struct device *dev, |
1001 | struct device_attribute *attr, | |
1002 | char *buf) | |
bd37e5a9 KS |
1003 | { |
1004 | struct input_dev *id = to_input_dev(dev); | |
1005 | ssize_t len; | |
1006 | ||
2db66876 DT |
1007 | len = input_print_modalias(buf, PAGE_SIZE, id, 1); |
1008 | ||
8a3cf456 | 1009 | return min_t(int, len, PAGE_SIZE); |
1d8f430c | 1010 | } |
9657d75c | 1011 | static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); |
1d8f430c | 1012 | |
629b77a4 | 1013 | static struct attribute *input_dev_attrs[] = { |
9657d75c DT |
1014 | &dev_attr_name.attr, |
1015 | &dev_attr_phys.attr, | |
1016 | &dev_attr_uniq.attr, | |
1017 | &dev_attr_modalias.attr, | |
629b77a4 GKH |
1018 | NULL |
1019 | }; | |
1020 | ||
bd0ef235 | 1021 | static struct attribute_group input_dev_attr_group = { |
629b77a4 | 1022 | .attrs = input_dev_attrs, |
5c1e9a6a DT |
1023 | }; |
1024 | ||
9657d75c DT |
1025 | #define INPUT_DEV_ID_ATTR(name) \ |
1026 | static ssize_t input_dev_show_id_##name(struct device *dev, \ | |
1027 | struct device_attribute *attr, \ | |
1028 | char *buf) \ | |
1029 | { \ | |
1030 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1031 | return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \ | |
1032 | } \ | |
1033 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL) | |
5c1e9a6a DT |
1034 | |
1035 | INPUT_DEV_ID_ATTR(bustype); | |
1036 | INPUT_DEV_ID_ATTR(vendor); | |
1037 | INPUT_DEV_ID_ATTR(product); | |
1038 | INPUT_DEV_ID_ATTR(version); | |
1039 | ||
1040 | static struct attribute *input_dev_id_attrs[] = { | |
9657d75c DT |
1041 | &dev_attr_bustype.attr, |
1042 | &dev_attr_vendor.attr, | |
1043 | &dev_attr_product.attr, | |
1044 | &dev_attr_version.attr, | |
5c1e9a6a DT |
1045 | NULL |
1046 | }; | |
1047 | ||
1048 | static struct attribute_group input_dev_id_attr_group = { | |
1049 | .name = "id", | |
1050 | .attrs = input_dev_id_attrs, | |
1051 | }; | |
1052 | ||
969b21cd DT |
1053 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1054 | int max, int add_cr) | |
1055 | { | |
1056 | int i; | |
1057 | int len = 0; | |
1058 | ||
7b19ada2 | 1059 | for (i = BITS_TO_LONGS(max) - 1; i > 0; i--) |
969b21cd DT |
1060 | if (bitmap[i]) |
1061 | break; | |
1062 | ||
1063 | for (; i >= 0; i--) | |
1064 | len += snprintf(buf + len, max(buf_size - len, 0), | |
1065 | "%lx%s", bitmap[i], i > 0 ? " " : ""); | |
1066 | ||
1067 | if (add_cr) | |
1068 | len += snprintf(buf + len, max(buf_size - len, 0), "\n"); | |
1069 | ||
1070 | return len; | |
1071 | } | |
1072 | ||
9657d75c DT |
1073 | #define INPUT_DEV_CAP_ATTR(ev, bm) \ |
1074 | static ssize_t input_dev_show_cap_##bm(struct device *dev, \ | |
1075 | struct device_attribute *attr, \ | |
1076 | char *buf) \ | |
1077 | { \ | |
1078 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1079 | int len = input_print_bitmap(buf, PAGE_SIZE, \ | |
1080 | input_dev->bm##bit, ev##_MAX, 1); \ | |
1081 | return min_t(int, len, PAGE_SIZE); \ | |
1082 | } \ | |
1083 | static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL) | |
5c1e9a6a DT |
1084 | |
1085 | INPUT_DEV_CAP_ATTR(EV, ev); | |
1086 | INPUT_DEV_CAP_ATTR(KEY, key); | |
1087 | INPUT_DEV_CAP_ATTR(REL, rel); | |
1088 | INPUT_DEV_CAP_ATTR(ABS, abs); | |
1089 | INPUT_DEV_CAP_ATTR(MSC, msc); | |
1090 | INPUT_DEV_CAP_ATTR(LED, led); | |
1091 | INPUT_DEV_CAP_ATTR(SND, snd); | |
1092 | INPUT_DEV_CAP_ATTR(FF, ff); | |
1093 | INPUT_DEV_CAP_ATTR(SW, sw); | |
1094 | ||
1095 | static struct attribute *input_dev_caps_attrs[] = { | |
9657d75c DT |
1096 | &dev_attr_ev.attr, |
1097 | &dev_attr_key.attr, | |
1098 | &dev_attr_rel.attr, | |
1099 | &dev_attr_abs.attr, | |
1100 | &dev_attr_msc.attr, | |
1101 | &dev_attr_led.attr, | |
1102 | &dev_attr_snd.attr, | |
1103 | &dev_attr_ff.attr, | |
1104 | &dev_attr_sw.attr, | |
5c1e9a6a DT |
1105 | NULL |
1106 | }; | |
1107 | ||
1108 | static struct attribute_group input_dev_caps_attr_group = { | |
1109 | .name = "capabilities", | |
1110 | .attrs = input_dev_caps_attrs, | |
1111 | }; | |
1112 | ||
cb9def4d DT |
1113 | static struct attribute_group *input_dev_attr_groups[] = { |
1114 | &input_dev_attr_group, | |
1115 | &input_dev_id_attr_group, | |
1116 | &input_dev_caps_attr_group, | |
1117 | NULL | |
1118 | }; | |
1119 | ||
9657d75c | 1120 | static void input_dev_release(struct device *device) |
d19fbe8a | 1121 | { |
9657d75c | 1122 | struct input_dev *dev = to_input_dev(device); |
d19fbe8a | 1123 | |
509ca1a9 | 1124 | input_ff_destroy(dev); |
d19fbe8a | 1125 | kfree(dev); |
509ca1a9 | 1126 | |
d19fbe8a DT |
1127 | module_put(THIS_MODULE); |
1128 | } | |
1129 | ||
a7fadbe1 | 1130 | /* |
312c004d | 1131 | * Input uevent interface - loading event handlers based on |
a7fadbe1 DT |
1132 | * device bitfields. |
1133 | */ | |
7eff2e7a | 1134 | static int input_add_uevent_bm_var(struct kobj_uevent_env *env, |
ac648a6a | 1135 | const char *name, unsigned long *bitmap, int max) |
a7fadbe1 | 1136 | { |
7eff2e7a | 1137 | int len; |
a7fadbe1 | 1138 | |
7eff2e7a | 1139 | if (add_uevent_var(env, "%s=", name)) |
a7fadbe1 DT |
1140 | return -ENOMEM; |
1141 | ||
7eff2e7a KS |
1142 | len = input_print_bitmap(&env->buf[env->buflen - 1], |
1143 | sizeof(env->buf) - env->buflen, | |
1144 | bitmap, max, 0); | |
1145 | if (len >= (sizeof(env->buf) - env->buflen)) | |
a7fadbe1 DT |
1146 | return -ENOMEM; |
1147 | ||
7eff2e7a | 1148 | env->buflen += len; |
a7fadbe1 DT |
1149 | return 0; |
1150 | } | |
1151 | ||
7eff2e7a | 1152 | static int input_add_uevent_modalias_var(struct kobj_uevent_env *env, |
ac648a6a DT |
1153 | struct input_dev *dev) |
1154 | { | |
7eff2e7a | 1155 | int len; |
ac648a6a | 1156 | |
7eff2e7a | 1157 | if (add_uevent_var(env, "MODALIAS=")) |
ac648a6a DT |
1158 | return -ENOMEM; |
1159 | ||
7eff2e7a KS |
1160 | len = input_print_modalias(&env->buf[env->buflen - 1], |
1161 | sizeof(env->buf) - env->buflen, | |
1162 | dev, 0); | |
1163 | if (len >= (sizeof(env->buf) - env->buflen)) | |
ac648a6a DT |
1164 | return -ENOMEM; |
1165 | ||
7eff2e7a | 1166 | env->buflen += len; |
ac648a6a DT |
1167 | return 0; |
1168 | } | |
1169 | ||
a7fadbe1 DT |
1170 | #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \ |
1171 | do { \ | |
7eff2e7a | 1172 | int err = add_uevent_var(env, fmt, val); \ |
a7fadbe1 DT |
1173 | if (err) \ |
1174 | return err; \ | |
1175 | } while (0) | |
1176 | ||
1177 | #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \ | |
1178 | do { \ | |
7eff2e7a | 1179 | int err = input_add_uevent_bm_var(env, name, bm, max); \ |
a7fadbe1 DT |
1180 | if (err) \ |
1181 | return err; \ | |
1182 | } while (0) | |
1183 | ||
ac648a6a DT |
1184 | #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \ |
1185 | do { \ | |
7eff2e7a | 1186 | int err = input_add_uevent_modalias_var(env, dev); \ |
ac648a6a DT |
1187 | if (err) \ |
1188 | return err; \ | |
1189 | } while (0) | |
1190 | ||
7eff2e7a | 1191 | static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env) |
a7fadbe1 | 1192 | { |
9657d75c | 1193 | struct input_dev *dev = to_input_dev(device); |
a7fadbe1 DT |
1194 | |
1195 | INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x", | |
1196 | dev->id.bustype, dev->id.vendor, | |
1197 | dev->id.product, dev->id.version); | |
1198 | if (dev->name) | |
1199 | INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); | |
1200 | if (dev->phys) | |
1201 | INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); | |
08de1f04 | 1202 | if (dev->uniq) |
a7fadbe1 DT |
1203 | INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); |
1204 | ||
1205 | INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX); | |
1206 | if (test_bit(EV_KEY, dev->evbit)) | |
1207 | INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX); | |
1208 | if (test_bit(EV_REL, dev->evbit)) | |
1209 | INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX); | |
1210 | if (test_bit(EV_ABS, dev->evbit)) | |
1211 | INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX); | |
1212 | if (test_bit(EV_MSC, dev->evbit)) | |
1213 | INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX); | |
1214 | if (test_bit(EV_LED, dev->evbit)) | |
1215 | INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX); | |
1216 | if (test_bit(EV_SND, dev->evbit)) | |
1217 | INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX); | |
1218 | if (test_bit(EV_FF, dev->evbit)) | |
1219 | INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX); | |
1220 | if (test_bit(EV_SW, dev->evbit)) | |
1221 | INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); | |
1222 | ||
ac648a6a | 1223 | INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); |
a7fadbe1 DT |
1224 | |
1225 | return 0; | |
1226 | } | |
1227 | ||
9657d75c DT |
1228 | static struct device_type input_dev_type = { |
1229 | .groups = input_dev_attr_groups, | |
1230 | .release = input_dev_release, | |
1231 | .uevent = input_dev_uevent, | |
1232 | }; | |
1233 | ||
ea9f240b | 1234 | struct class input_class = { |
9657d75c | 1235 | .name = "input", |
d19fbe8a | 1236 | }; |
ca56fe07 | 1237 | EXPORT_SYMBOL_GPL(input_class); |
d19fbe8a | 1238 | |
1447190e DT |
1239 | /** |
1240 | * input_allocate_device - allocate memory for new input device | |
1241 | * | |
1242 | * Returns prepared struct input_dev or NULL. | |
1243 | * | |
1244 | * NOTE: Use input_free_device() to free devices that have not been | |
1245 | * registered; input_unregister_device() should be used for already | |
1246 | * registered devices. | |
1247 | */ | |
d19fbe8a DT |
1248 | struct input_dev *input_allocate_device(void) |
1249 | { | |
1250 | struct input_dev *dev; | |
1251 | ||
1252 | dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); | |
1253 | if (dev) { | |
9657d75c DT |
1254 | dev->dev.type = &input_dev_type; |
1255 | dev->dev.class = &input_class; | |
1256 | device_initialize(&dev->dev); | |
f60d2b11 | 1257 | mutex_init(&dev->mutex); |
8006479c | 1258 | spin_lock_init(&dev->event_lock); |
d19fbe8a DT |
1259 | INIT_LIST_HEAD(&dev->h_list); |
1260 | INIT_LIST_HEAD(&dev->node); | |
655816e4 DT |
1261 | |
1262 | __module_get(THIS_MODULE); | |
d19fbe8a DT |
1263 | } |
1264 | ||
1265 | return dev; | |
1266 | } | |
ca56fe07 | 1267 | EXPORT_SYMBOL(input_allocate_device); |
d19fbe8a | 1268 | |
1447190e DT |
1269 | /** |
1270 | * input_free_device - free memory occupied by input_dev structure | |
1271 | * @dev: input device to free | |
1272 | * | |
1273 | * This function should only be used if input_register_device() | |
1274 | * was not called yet or if it failed. Once device was registered | |
1275 | * use input_unregister_device() and memory will be freed once last | |
8006479c | 1276 | * reference to the device is dropped. |
1447190e DT |
1277 | * |
1278 | * Device should be allocated by input_allocate_device(). | |
1279 | * | |
1280 | * NOTE: If there are references to the input device then memory | |
1281 | * will not be freed until last reference is dropped. | |
1282 | */ | |
f60d2b11 DT |
1283 | void input_free_device(struct input_dev *dev) |
1284 | { | |
54f9e36c | 1285 | if (dev) |
f60d2b11 | 1286 | input_put_device(dev); |
f60d2b11 | 1287 | } |
ca56fe07 | 1288 | EXPORT_SYMBOL(input_free_device); |
f60d2b11 | 1289 | |
534565f2 DT |
1290 | /** |
1291 | * input_set_capability - mark device as capable of a certain event | |
1292 | * @dev: device that is capable of emitting or accepting event | |
1293 | * @type: type of the event (EV_KEY, EV_REL, etc...) | |
1294 | * @code: event code | |
1295 | * | |
1296 | * In addition to setting up corresponding bit in appropriate capability | |
1297 | * bitmap the function also adjusts dev->evbit. | |
1298 | */ | |
1299 | void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code) | |
1300 | { | |
1301 | switch (type) { | |
1302 | case EV_KEY: | |
1303 | __set_bit(code, dev->keybit); | |
1304 | break; | |
1305 | ||
1306 | case EV_REL: | |
1307 | __set_bit(code, dev->relbit); | |
1308 | break; | |
1309 | ||
1310 | case EV_ABS: | |
1311 | __set_bit(code, dev->absbit); | |
1312 | break; | |
1313 | ||
1314 | case EV_MSC: | |
1315 | __set_bit(code, dev->mscbit); | |
1316 | break; | |
1317 | ||
1318 | case EV_SW: | |
1319 | __set_bit(code, dev->swbit); | |
1320 | break; | |
1321 | ||
1322 | case EV_LED: | |
1323 | __set_bit(code, dev->ledbit); | |
1324 | break; | |
1325 | ||
1326 | case EV_SND: | |
1327 | __set_bit(code, dev->sndbit); | |
1328 | break; | |
1329 | ||
1330 | case EV_FF: | |
1331 | __set_bit(code, dev->ffbit); | |
1332 | break; | |
1333 | ||
22d1c398 DB |
1334 | case EV_PWR: |
1335 | /* do nothing */ | |
1336 | break; | |
1337 | ||
534565f2 DT |
1338 | default: |
1339 | printk(KERN_ERR | |
1340 | "input_set_capability: unknown type %u (code %u)\n", | |
1341 | type, code); | |
1342 | dump_stack(); | |
1343 | return; | |
1344 | } | |
1345 | ||
1346 | __set_bit(type, dev->evbit); | |
1347 | } | |
1348 | EXPORT_SYMBOL(input_set_capability); | |
1349 | ||
8006479c DT |
1350 | /** |
1351 | * input_register_device - register device with input core | |
1352 | * @dev: device to be registered | |
1353 | * | |
1354 | * This function registers device with input core. The device must be | |
1355 | * allocated with input_allocate_device() and all it's capabilities | |
1356 | * set up before registering. | |
1357 | * If function fails the device must be freed with input_free_device(). | |
1358 | * Once device has been successfully registered it can be unregistered | |
1359 | * with input_unregister_device(); input_free_device() should not be | |
1360 | * called in this case. | |
1361 | */ | |
5f945489 | 1362 | int input_register_device(struct input_dev *dev) |
1da177e4 | 1363 | { |
bd0ef235 | 1364 | static atomic_t input_no = ATOMIC_INIT(0); |
1da177e4 | 1365 | struct input_handler *handler; |
bd0ef235 DT |
1366 | const char *path; |
1367 | int error; | |
1da177e4 | 1368 | |
8006479c | 1369 | __set_bit(EV_SYN, dev->evbit); |
0fbf87ca | 1370 | |
1da177e4 LT |
1371 | /* |
1372 | * If delay and period are pre-set by the driver, then autorepeating | |
1373 | * is handled by the driver itself and we don't do it in input.c. | |
1374 | */ | |
1375 | ||
1376 | init_timer(&dev->timer); | |
1377 | if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { | |
1378 | dev->timer.data = (long) dev; | |
1379 | dev->timer.function = input_repeat_key; | |
1380 | dev->rep[REP_DELAY] = 250; | |
1381 | dev->rep[REP_PERIOD] = 33; | |
1382 | } | |
1383 | ||
c8e4c772 MR |
1384 | if (!dev->getkeycode) |
1385 | dev->getkeycode = input_default_getkeycode; | |
1386 | ||
1387 | if (!dev->setkeycode) | |
1388 | dev->setkeycode = input_default_setkeycode; | |
1389 | ||
a6c2490f KS |
1390 | dev_set_name(&dev->dev, "input%ld", |
1391 | (unsigned long) atomic_inc_return(&input_no) - 1); | |
bd0ef235 | 1392 | |
9657d75c | 1393 | error = device_add(&dev->dev); |
bd0ef235 DT |
1394 | if (error) |
1395 | return error; | |
1396 | ||
9657d75c | 1397 | path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
bd0ef235 DT |
1398 | printk(KERN_INFO "input: %s as %s\n", |
1399 | dev->name ? dev->name : "Unspecified device", path ? path : "N/A"); | |
1400 | kfree(path); | |
10204020 | 1401 | |
8006479c DT |
1402 | error = mutex_lock_interruptible(&input_mutex); |
1403 | if (error) { | |
1404 | device_del(&dev->dev); | |
1405 | return error; | |
1406 | } | |
1407 | ||
1408 | list_add_tail(&dev->node, &input_dev_list); | |
1409 | ||
1da177e4 | 1410 | list_for_each_entry(handler, &input_handler_list, node) |
5b2a0826 | 1411 | input_attach_handler(dev, handler); |
1da177e4 | 1412 | |
f96b434d | 1413 | input_wakeup_procfs_readers(); |
5f945489 | 1414 | |
8006479c DT |
1415 | mutex_unlock(&input_mutex); |
1416 | ||
5f945489 | 1417 | return 0; |
1da177e4 | 1418 | } |
ca56fe07 | 1419 | EXPORT_SYMBOL(input_register_device); |
1da177e4 | 1420 | |
8006479c DT |
1421 | /** |
1422 | * input_unregister_device - unregister previously registered device | |
1423 | * @dev: device to be unregistered | |
1424 | * | |
1425 | * This function unregisters an input device. Once device is unregistered | |
1426 | * the caller should not try to access it as it may get freed at any moment. | |
1427 | */ | |
1da177e4 LT |
1428 | void input_unregister_device(struct input_dev *dev) |
1429 | { | |
5b2a0826 | 1430 | struct input_handle *handle, *next; |
1da177e4 | 1431 | |
8006479c | 1432 | input_disconnect_device(dev); |
1da177e4 | 1433 | |
8006479c | 1434 | mutex_lock(&input_mutex); |
1da177e4 | 1435 | |
5b2a0826 | 1436 | list_for_each_entry_safe(handle, next, &dev->h_list, d_node) |
1da177e4 | 1437 | handle->handler->disconnect(handle); |
5b2a0826 | 1438 | WARN_ON(!list_empty(&dev->h_list)); |
1da177e4 | 1439 | |
8006479c | 1440 | del_timer_sync(&dev->timer); |
1da177e4 LT |
1441 | list_del_init(&dev->node); |
1442 | ||
f96b434d | 1443 | input_wakeup_procfs_readers(); |
8006479c DT |
1444 | |
1445 | mutex_unlock(&input_mutex); | |
1446 | ||
1447 | device_unregister(&dev->dev); | |
1da177e4 | 1448 | } |
ca56fe07 | 1449 | EXPORT_SYMBOL(input_unregister_device); |
1da177e4 | 1450 | |
8006479c DT |
1451 | /** |
1452 | * input_register_handler - register a new input handler | |
1453 | * @handler: handler to be registered | |
1454 | * | |
1455 | * This function registers a new input handler (interface) for input | |
1456 | * devices in the system and attaches it to all input devices that | |
1457 | * are compatible with the handler. | |
1458 | */ | |
4263cf0f | 1459 | int input_register_handler(struct input_handler *handler) |
1da177e4 LT |
1460 | { |
1461 | struct input_dev *dev; | |
8006479c DT |
1462 | int retval; |
1463 | ||
1464 | retval = mutex_lock_interruptible(&input_mutex); | |
1465 | if (retval) | |
1466 | return retval; | |
1da177e4 | 1467 | |
1da177e4 LT |
1468 | INIT_LIST_HEAD(&handler->h_list); |
1469 | ||
4263cf0f | 1470 | if (handler->fops != NULL) { |
8006479c DT |
1471 | if (input_table[handler->minor >> 5]) { |
1472 | retval = -EBUSY; | |
1473 | goto out; | |
1474 | } | |
1da177e4 | 1475 | input_table[handler->minor >> 5] = handler; |
4263cf0f | 1476 | } |
1da177e4 LT |
1477 | |
1478 | list_add_tail(&handler->node, &input_handler_list); | |
1479 | ||
1480 | list_for_each_entry(dev, &input_dev_list, node) | |
5b2a0826 | 1481 | input_attach_handler(dev, handler); |
1da177e4 | 1482 | |
f96b434d | 1483 | input_wakeup_procfs_readers(); |
8006479c DT |
1484 | |
1485 | out: | |
1486 | mutex_unlock(&input_mutex); | |
1487 | return retval; | |
1da177e4 | 1488 | } |
ca56fe07 | 1489 | EXPORT_SYMBOL(input_register_handler); |
1da177e4 | 1490 | |
8006479c DT |
1491 | /** |
1492 | * input_unregister_handler - unregisters an input handler | |
1493 | * @handler: handler to be unregistered | |
1494 | * | |
1495 | * This function disconnects a handler from its input devices and | |
1496 | * removes it from lists of known handlers. | |
1497 | */ | |
1da177e4 LT |
1498 | void input_unregister_handler(struct input_handler *handler) |
1499 | { | |
5b2a0826 | 1500 | struct input_handle *handle, *next; |
1da177e4 | 1501 | |
8006479c DT |
1502 | mutex_lock(&input_mutex); |
1503 | ||
5b2a0826 | 1504 | list_for_each_entry_safe(handle, next, &handler->h_list, h_node) |
1da177e4 | 1505 | handler->disconnect(handle); |
5b2a0826 | 1506 | WARN_ON(!list_empty(&handler->h_list)); |
1da177e4 LT |
1507 | |
1508 | list_del_init(&handler->node); | |
1509 | ||
1510 | if (handler->fops != NULL) | |
1511 | input_table[handler->minor >> 5] = NULL; | |
1512 | ||
f96b434d | 1513 | input_wakeup_procfs_readers(); |
8006479c DT |
1514 | |
1515 | mutex_unlock(&input_mutex); | |
1da177e4 | 1516 | } |
ca56fe07 | 1517 | EXPORT_SYMBOL(input_unregister_handler); |
1da177e4 | 1518 | |
8006479c DT |
1519 | /** |
1520 | * input_register_handle - register a new input handle | |
1521 | * @handle: handle to register | |
1522 | * | |
1523 | * This function puts a new input handle onto device's | |
1524 | * and handler's lists so that events can flow through | |
1525 | * it once it is opened using input_open_device(). | |
1526 | * | |
1527 | * This function is supposed to be called from handler's | |
1528 | * connect() method. | |
1529 | */ | |
5b2a0826 DT |
1530 | int input_register_handle(struct input_handle *handle) |
1531 | { | |
1532 | struct input_handler *handler = handle->handler; | |
8006479c DT |
1533 | struct input_dev *dev = handle->dev; |
1534 | int error; | |
1535 | ||
1536 | /* | |
1537 | * We take dev->mutex here to prevent race with | |
1538 | * input_release_device(). | |
1539 | */ | |
1540 | error = mutex_lock_interruptible(&dev->mutex); | |
1541 | if (error) | |
1542 | return error; | |
1543 | list_add_tail_rcu(&handle->d_node, &dev->h_list); | |
1544 | mutex_unlock(&dev->mutex); | |
82ba56c2 | 1545 | synchronize_rcu(); |
5b2a0826 | 1546 | |
8006479c DT |
1547 | /* |
1548 | * Since we are supposed to be called from ->connect() | |
1549 | * which is mutually exclusive with ->disconnect() | |
1550 | * we can't be racing with input_unregister_handle() | |
1551 | * and so separate lock is not needed here. | |
1552 | */ | |
5b2a0826 DT |
1553 | list_add_tail(&handle->h_node, &handler->h_list); |
1554 | ||
1555 | if (handler->start) | |
1556 | handler->start(handle); | |
1557 | ||
1558 | return 0; | |
1559 | } | |
1560 | EXPORT_SYMBOL(input_register_handle); | |
1561 | ||
8006479c DT |
1562 | /** |
1563 | * input_unregister_handle - unregister an input handle | |
1564 | * @handle: handle to unregister | |
1565 | * | |
1566 | * This function removes input handle from device's | |
1567 | * and handler's lists. | |
1568 | * | |
1569 | * This function is supposed to be called from handler's | |
1570 | * disconnect() method. | |
1571 | */ | |
5b2a0826 DT |
1572 | void input_unregister_handle(struct input_handle *handle) |
1573 | { | |
8006479c DT |
1574 | struct input_dev *dev = handle->dev; |
1575 | ||
5b2a0826 | 1576 | list_del_init(&handle->h_node); |
8006479c DT |
1577 | |
1578 | /* | |
1579 | * Take dev->mutex to prevent race with input_release_device(). | |
1580 | */ | |
1581 | mutex_lock(&dev->mutex); | |
1582 | list_del_rcu(&handle->d_node); | |
1583 | mutex_unlock(&dev->mutex); | |
82ba56c2 | 1584 | synchronize_rcu(); |
5b2a0826 DT |
1585 | } |
1586 | EXPORT_SYMBOL(input_unregister_handle); | |
1587 | ||
1da177e4 LT |
1588 | static int input_open_file(struct inode *inode, struct file *file) |
1589 | { | |
2edbf853 | 1590 | struct input_handler *handler; |
99ac48f5 | 1591 | const struct file_operations *old_fops, *new_fops = NULL; |
1da177e4 LT |
1592 | int err; |
1593 | ||
2edbf853 | 1594 | lock_kernel(); |
1da177e4 | 1595 | /* No load-on-demand here? */ |
2edbf853 JC |
1596 | handler = input_table[iminor(inode) >> 5]; |
1597 | if (!handler || !(new_fops = fops_get(handler->fops))) { | |
1598 | err = -ENODEV; | |
1599 | goto out; | |
1600 | } | |
1da177e4 LT |
1601 | |
1602 | /* | |
1603 | * That's _really_ odd. Usually NULL ->open means "nothing special", | |
1604 | * not "no device". Oh, well... | |
1605 | */ | |
1606 | if (!new_fops->open) { | |
1607 | fops_put(new_fops); | |
2edbf853 JC |
1608 | err = -ENODEV; |
1609 | goto out; | |
1da177e4 LT |
1610 | } |
1611 | old_fops = file->f_op; | |
1612 | file->f_op = new_fops; | |
1613 | ||
1614 | err = new_fops->open(inode, file); | |
1615 | ||
1616 | if (err) { | |
1617 | fops_put(file->f_op); | |
1618 | file->f_op = fops_get(old_fops); | |
1619 | } | |
1620 | fops_put(old_fops); | |
2edbf853 JC |
1621 | out: |
1622 | unlock_kernel(); | |
1da177e4 LT |
1623 | return err; |
1624 | } | |
1625 | ||
2b8693c0 | 1626 | static const struct file_operations input_fops = { |
1da177e4 LT |
1627 | .owner = THIS_MODULE, |
1628 | .open = input_open_file, | |
1629 | }; | |
1630 | ||
f96b434d | 1631 | static int __init input_init(void) |
1da177e4 | 1632 | { |
f96b434d | 1633 | int err; |
1da177e4 | 1634 | |
ea9f240b | 1635 | err = class_register(&input_class); |
d19fbe8a DT |
1636 | if (err) { |
1637 | printk(KERN_ERR "input: unable to register input_dev class\n"); | |
1638 | return err; | |
1639 | } | |
1640 | ||
f96b434d DT |
1641 | err = input_proc_init(); |
1642 | if (err) | |
b0fdfebb | 1643 | goto fail1; |
1da177e4 | 1644 | |
f96b434d DT |
1645 | err = register_chrdev(INPUT_MAJOR, "input", &input_fops); |
1646 | if (err) { | |
1647 | printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR); | |
b0fdfebb | 1648 | goto fail2; |
1da177e4 | 1649 | } |
e334016f | 1650 | |
1da177e4 | 1651 | return 0; |
1da177e4 | 1652 | |
b0fdfebb | 1653 | fail2: input_proc_exit(); |
ea9f240b | 1654 | fail1: class_unregister(&input_class); |
f96b434d | 1655 | return err; |
1da177e4 LT |
1656 | } |
1657 | ||
1658 | static void __exit input_exit(void) | |
1659 | { | |
f96b434d | 1660 | input_proc_exit(); |
1da177e4 | 1661 | unregister_chrdev(INPUT_MAJOR, "input"); |
ea9f240b | 1662 | class_unregister(&input_class); |
1da177e4 LT |
1663 | } |
1664 | ||
1665 | subsys_initcall(input_init); | |
1666 | module_exit(input_exit); |