]>
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> | |
ffd0db97 | 14 | #include <linux/types.h> |
1da177e4 LT |
15 | #include <linux/input.h> |
16 | #include <linux/module.h> | |
17 | #include <linux/random.h> | |
18 | #include <linux/major.h> | |
19 | #include <linux/proc_fs.h> | |
969b21cd | 20 | #include <linux/seq_file.h> |
1da177e4 LT |
21 | #include <linux/poll.h> |
22 | #include <linux/device.h> | |
e676c232 | 23 | #include <linux/mutex.h> |
8006479c | 24 | #include <linux/rcupdate.h> |
2edbf853 | 25 | #include <linux/smp_lock.h> |
1da177e4 LT |
26 | |
27 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>"); | |
28 | MODULE_DESCRIPTION("Input core"); | |
29 | MODULE_LICENSE("GPL"); | |
30 | ||
1da177e4 LT |
31 | #define INPUT_DEVICES 256 |
32 | ||
61994a61 HR |
33 | /* |
34 | * EV_ABS events which should not be cached are listed here. | |
35 | */ | |
36 | static unsigned int input_abs_bypass_init_data[] __initdata = { | |
5e5ee686 HR |
37 | ABS_MT_TOUCH_MAJOR, |
38 | ABS_MT_TOUCH_MINOR, | |
39 | ABS_MT_WIDTH_MAJOR, | |
40 | ABS_MT_WIDTH_MINOR, | |
41 | ABS_MT_ORIENTATION, | |
42 | ABS_MT_POSITION_X, | |
43 | ABS_MT_POSITION_Y, | |
44 | ABS_MT_TOOL_TYPE, | |
45 | ABS_MT_BLOB_ID, | |
df391e0e | 46 | ABS_MT_TRACKING_ID, |
61994a61 HR |
47 | 0 |
48 | }; | |
49 | static unsigned long input_abs_bypass[BITS_TO_LONGS(ABS_CNT)]; | |
50 | ||
1da177e4 LT |
51 | static LIST_HEAD(input_dev_list); |
52 | static LIST_HEAD(input_handler_list); | |
53 | ||
8006479c DT |
54 | /* |
55 | * input_mutex protects access to both input_dev_list and input_handler_list. | |
56 | * This also causes input_[un]register_device and input_[un]register_handler | |
57 | * be mutually exclusive which simplifies locking in drivers implementing | |
58 | * input handlers. | |
59 | */ | |
60 | static DEFINE_MUTEX(input_mutex); | |
61 | ||
1da177e4 LT |
62 | static struct input_handler *input_table[8]; |
63 | ||
8006479c DT |
64 | static inline int is_event_supported(unsigned int code, |
65 | unsigned long *bm, unsigned int max) | |
1da177e4 | 66 | { |
8006479c DT |
67 | return code <= max && test_bit(code, bm); |
68 | } | |
1da177e4 | 69 | |
8006479c DT |
70 | static int input_defuzz_abs_event(int value, int old_val, int fuzz) |
71 | { | |
72 | if (fuzz) { | |
73 | if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2) | |
74 | return old_val; | |
1da177e4 | 75 | |
8006479c DT |
76 | if (value > old_val - fuzz && value < old_val + fuzz) |
77 | return (old_val * 3 + value) / 4; | |
1da177e4 | 78 | |
8006479c DT |
79 | if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2) |
80 | return (old_val + value) / 2; | |
81 | } | |
1da177e4 | 82 | |
8006479c DT |
83 | return value; |
84 | } | |
1da177e4 | 85 | |
8006479c DT |
86 | /* |
87 | * Pass event through all open handles. This function is called with | |
82ba56c2 | 88 | * dev->event_lock held and interrupts disabled. |
8006479c DT |
89 | */ |
90 | static void input_pass_event(struct input_dev *dev, | |
91 | unsigned int type, unsigned int code, int value) | |
92 | { | |
82ba56c2 DT |
93 | struct input_handle *handle; |
94 | ||
95 | rcu_read_lock(); | |
1da177e4 | 96 | |
82ba56c2 | 97 | handle = rcu_dereference(dev->grab); |
8006479c DT |
98 | if (handle) |
99 | handle->handler->event(handle, type, code, value); | |
100 | else | |
101 | list_for_each_entry_rcu(handle, &dev->h_list, d_node) | |
102 | if (handle->open) | |
103 | handle->handler->event(handle, | |
104 | type, code, value); | |
82ba56c2 | 105 | rcu_read_unlock(); |
8006479c | 106 | } |
1da177e4 | 107 | |
8006479c DT |
108 | /* |
109 | * Generate software autorepeat event. Note that we take | |
110 | * dev->event_lock here to avoid racing with input_event | |
111 | * which may cause keys get "stuck". | |
112 | */ | |
113 | static void input_repeat_key(unsigned long data) | |
114 | { | |
115 | struct input_dev *dev = (void *) data; | |
116 | unsigned long flags; | |
1da177e4 | 117 | |
8006479c | 118 | spin_lock_irqsave(&dev->event_lock, flags); |
1da177e4 | 119 | |
8006479c DT |
120 | if (test_bit(dev->repeat_key, dev->key) && |
121 | is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) { | |
1da177e4 | 122 | |
8006479c | 123 | input_pass_event(dev, EV_KEY, dev->repeat_key, 2); |
1da177e4 | 124 | |
8006479c DT |
125 | if (dev->sync) { |
126 | /* | |
127 | * Only send SYN_REPORT if we are not in a middle | |
128 | * of driver parsing a new hardware packet. | |
129 | * Otherwise assume that the driver will send | |
130 | * SYN_REPORT once it's done. | |
131 | */ | |
132 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
133 | } | |
31581066 | 134 | |
8006479c DT |
135 | if (dev->rep[REP_PERIOD]) |
136 | mod_timer(&dev->timer, jiffies + | |
137 | msecs_to_jiffies(dev->rep[REP_PERIOD])); | |
138 | } | |
31581066 | 139 | |
8006479c DT |
140 | spin_unlock_irqrestore(&dev->event_lock, flags); |
141 | } | |
31581066 | 142 | |
8006479c DT |
143 | static void input_start_autorepeat(struct input_dev *dev, int code) |
144 | { | |
145 | if (test_bit(EV_REP, dev->evbit) && | |
146 | dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && | |
147 | dev->timer.data) { | |
148 | dev->repeat_key = code; | |
149 | mod_timer(&dev->timer, | |
150 | jiffies + msecs_to_jiffies(dev->rep[REP_DELAY])); | |
151 | } | |
152 | } | |
31581066 | 153 | |
e7b5c1ef JB |
154 | static void input_stop_autorepeat(struct input_dev *dev) |
155 | { | |
156 | del_timer(&dev->timer); | |
157 | } | |
158 | ||
8006479c DT |
159 | #define INPUT_IGNORE_EVENT 0 |
160 | #define INPUT_PASS_TO_HANDLERS 1 | |
161 | #define INPUT_PASS_TO_DEVICE 2 | |
162 | #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE) | |
1da177e4 | 163 | |
8006479c DT |
164 | static void input_handle_event(struct input_dev *dev, |
165 | unsigned int type, unsigned int code, int value) | |
166 | { | |
167 | int disposition = INPUT_IGNORE_EVENT; | |
1da177e4 | 168 | |
8006479c | 169 | switch (type) { |
1da177e4 | 170 | |
8006479c DT |
171 | case EV_SYN: |
172 | switch (code) { | |
173 | case SYN_CONFIG: | |
174 | disposition = INPUT_PASS_TO_ALL; | |
175 | break; | |
1da177e4 | 176 | |
8006479c DT |
177 | case SYN_REPORT: |
178 | if (!dev->sync) { | |
179 | dev->sync = 1; | |
180 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 181 | } |
1da177e4 | 182 | break; |
5e5ee686 HR |
183 | case SYN_MT_REPORT: |
184 | dev->sync = 0; | |
185 | disposition = INPUT_PASS_TO_HANDLERS; | |
186 | break; | |
8006479c DT |
187 | } |
188 | break; | |
1da177e4 | 189 | |
8006479c DT |
190 | case EV_KEY: |
191 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
192 | !!test_bit(code, dev->key) != value) { | |
1da177e4 | 193 | |
8006479c DT |
194 | if (value != 2) { |
195 | __change_bit(code, dev->key); | |
196 | if (value) | |
197 | input_start_autorepeat(dev, code); | |
e7b5c1ef JB |
198 | else |
199 | input_stop_autorepeat(dev); | |
8006479c | 200 | } |
1da177e4 | 201 | |
8006479c DT |
202 | disposition = INPUT_PASS_TO_HANDLERS; |
203 | } | |
204 | break; | |
1da177e4 | 205 | |
8006479c DT |
206 | case EV_SW: |
207 | if (is_event_supported(code, dev->swbit, SW_MAX) && | |
208 | !!test_bit(code, dev->sw) != value) { | |
1da177e4 | 209 | |
8006479c DT |
210 | __change_bit(code, dev->sw); |
211 | disposition = INPUT_PASS_TO_HANDLERS; | |
212 | } | |
213 | break; | |
1da177e4 | 214 | |
8006479c DT |
215 | case EV_ABS: |
216 | if (is_event_supported(code, dev->absbit, ABS_MAX)) { | |
1da177e4 | 217 | |
61994a61 HR |
218 | if (test_bit(code, input_abs_bypass)) { |
219 | disposition = INPUT_PASS_TO_HANDLERS; | |
220 | break; | |
221 | } | |
222 | ||
8006479c DT |
223 | value = input_defuzz_abs_event(value, |
224 | dev->abs[code], dev->absfuzz[code]); | |
1da177e4 | 225 | |
8006479c DT |
226 | if (dev->abs[code] != value) { |
227 | dev->abs[code] = value; | |
228 | disposition = INPUT_PASS_TO_HANDLERS; | |
229 | } | |
230 | } | |
231 | break; | |
1da177e4 | 232 | |
8006479c DT |
233 | case EV_REL: |
234 | if (is_event_supported(code, dev->relbit, REL_MAX) && value) | |
235 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 236 | |
8006479c | 237 | break; |
1e0afb28 | 238 | |
8006479c DT |
239 | case EV_MSC: |
240 | if (is_event_supported(code, dev->mscbit, MSC_MAX)) | |
241 | disposition = INPUT_PASS_TO_ALL; | |
1da177e4 | 242 | |
8006479c | 243 | break; |
1da177e4 | 244 | |
8006479c DT |
245 | case EV_LED: |
246 | if (is_event_supported(code, dev->ledbit, LED_MAX) && | |
247 | !!test_bit(code, dev->led) != value) { | |
1da177e4 | 248 | |
8006479c DT |
249 | __change_bit(code, dev->led); |
250 | disposition = INPUT_PASS_TO_ALL; | |
251 | } | |
252 | break; | |
253 | ||
254 | case EV_SND: | |
255 | if (is_event_supported(code, dev->sndbit, SND_MAX)) { | |
1da177e4 | 256 | |
8fdc1948 | 257 | if (!!test_bit(code, dev->snd) != !!value) |
8006479c DT |
258 | __change_bit(code, dev->snd); |
259 | disposition = INPUT_PASS_TO_ALL; | |
260 | } | |
261 | break; | |
8fdc1948 | 262 | |
8006479c DT |
263 | case EV_REP: |
264 | if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) { | |
265 | dev->rep[code] = value; | |
266 | disposition = INPUT_PASS_TO_ALL; | |
267 | } | |
268 | break; | |
1da177e4 | 269 | |
8006479c DT |
270 | case EV_FF: |
271 | if (value >= 0) | |
272 | disposition = INPUT_PASS_TO_ALL; | |
273 | break; | |
ed2fa4dd RP |
274 | |
275 | case EV_PWR: | |
276 | disposition = INPUT_PASS_TO_ALL; | |
277 | break; | |
8006479c | 278 | } |
1da177e4 | 279 | |
c9812282 | 280 | if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN) |
8006479c | 281 | dev->sync = 0; |
1da177e4 | 282 | |
8006479c DT |
283 | if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event) |
284 | dev->event(dev, type, code, value); | |
1da177e4 | 285 | |
8006479c DT |
286 | if (disposition & INPUT_PASS_TO_HANDLERS) |
287 | input_pass_event(dev, type, code, value); | |
288 | } | |
1da177e4 | 289 | |
8006479c DT |
290 | /** |
291 | * input_event() - report new input event | |
292 | * @dev: device that generated the event | |
293 | * @type: type of the event | |
294 | * @code: event code | |
295 | * @value: value of the event | |
296 | * | |
297 | * This function should be used by drivers implementing various input | |
298 | * devices. See also input_inject_event(). | |
299 | */ | |
1da177e4 | 300 | |
8006479c DT |
301 | void input_event(struct input_dev *dev, |
302 | unsigned int type, unsigned int code, int value) | |
303 | { | |
304 | unsigned long flags; | |
509ca1a9 | 305 | |
8006479c | 306 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
509ca1a9 | 307 | |
8006479c DT |
308 | spin_lock_irqsave(&dev->event_lock, flags); |
309 | add_input_randomness(type, code, value); | |
310 | input_handle_event(dev, type, code, value); | |
311 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1da177e4 | 312 | } |
1da177e4 | 313 | } |
ca56fe07 | 314 | EXPORT_SYMBOL(input_event); |
1da177e4 | 315 | |
0e739d28 DT |
316 | /** |
317 | * input_inject_event() - send input event from input handler | |
318 | * @handle: input handle to send event through | |
319 | * @type: type of the event | |
320 | * @code: event code | |
321 | * @value: value of the event | |
322 | * | |
8006479c DT |
323 | * Similar to input_event() but will ignore event if device is |
324 | * "grabbed" and handle injecting event is not the one that owns | |
325 | * the device. | |
0e739d28 | 326 | */ |
8006479c DT |
327 | void input_inject_event(struct input_handle *handle, |
328 | unsigned int type, unsigned int code, int value) | |
1da177e4 | 329 | { |
8006479c DT |
330 | struct input_dev *dev = handle->dev; |
331 | struct input_handle *grab; | |
332 | unsigned long flags; | |
1da177e4 | 333 | |
8006479c DT |
334 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
335 | spin_lock_irqsave(&dev->event_lock, flags); | |
1da177e4 | 336 | |
82ba56c2 | 337 | rcu_read_lock(); |
8006479c DT |
338 | grab = rcu_dereference(dev->grab); |
339 | if (!grab || grab == handle) | |
340 | input_handle_event(dev, type, code, value); | |
82ba56c2 | 341 | rcu_read_unlock(); |
1da177e4 | 342 | |
8006479c DT |
343 | spin_unlock_irqrestore(&dev->event_lock, flags); |
344 | } | |
1da177e4 | 345 | } |
8006479c | 346 | EXPORT_SYMBOL(input_inject_event); |
1da177e4 | 347 | |
8006479c DT |
348 | /** |
349 | * input_grab_device - grabs device for exclusive use | |
350 | * @handle: input handle that wants to own the device | |
351 | * | |
352 | * When a device is grabbed by an input handle all events generated by | |
353 | * the device are delivered only to this handle. Also events injected | |
354 | * by other input handles are ignored while device is grabbed. | |
355 | */ | |
1da177e4 LT |
356 | int input_grab_device(struct input_handle *handle) |
357 | { | |
8006479c DT |
358 | struct input_dev *dev = handle->dev; |
359 | int retval; | |
1da177e4 | 360 | |
8006479c DT |
361 | retval = mutex_lock_interruptible(&dev->mutex); |
362 | if (retval) | |
363 | return retval; | |
364 | ||
365 | if (dev->grab) { | |
366 | retval = -EBUSY; | |
367 | goto out; | |
368 | } | |
369 | ||
370 | rcu_assign_pointer(dev->grab, handle); | |
82ba56c2 | 371 | synchronize_rcu(); |
8006479c DT |
372 | |
373 | out: | |
374 | mutex_unlock(&dev->mutex); | |
375 | return retval; | |
1da177e4 | 376 | } |
ca56fe07 | 377 | EXPORT_SYMBOL(input_grab_device); |
1da177e4 | 378 | |
8006479c | 379 | static void __input_release_device(struct input_handle *handle) |
1da177e4 | 380 | { |
a2b2ed2c | 381 | struct input_dev *dev = handle->dev; |
c7e8dc6e | 382 | |
a2b2ed2c | 383 | if (dev->grab == handle) { |
8006479c DT |
384 | rcu_assign_pointer(dev->grab, NULL); |
385 | /* Make sure input_pass_event() notices that grab is gone */ | |
82ba56c2 | 386 | synchronize_rcu(); |
a2b2ed2c AM |
387 | |
388 | list_for_each_entry(handle, &dev->h_list, d_node) | |
8006479c | 389 | if (handle->open && handle->handler->start) |
c7e8dc6e DT |
390 | handle->handler->start(handle); |
391 | } | |
1da177e4 | 392 | } |
8006479c DT |
393 | |
394 | /** | |
395 | * input_release_device - release previously grabbed device | |
396 | * @handle: input handle that owns the device | |
397 | * | |
398 | * Releases previously grabbed device so that other input handles can | |
399 | * start receiving input events. Upon release all handlers attached | |
400 | * to the device have their start() method called so they have a change | |
401 | * to synchronize device state with the rest of the system. | |
402 | */ | |
403 | void input_release_device(struct input_handle *handle) | |
404 | { | |
405 | struct input_dev *dev = handle->dev; | |
406 | ||
407 | mutex_lock(&dev->mutex); | |
408 | __input_release_device(handle); | |
409 | mutex_unlock(&dev->mutex); | |
410 | } | |
ca56fe07 | 411 | EXPORT_SYMBOL(input_release_device); |
1da177e4 | 412 | |
8006479c DT |
413 | /** |
414 | * input_open_device - open input device | |
415 | * @handle: handle through which device is being accessed | |
416 | * | |
417 | * This function should be called by input handlers when they | |
418 | * want to start receive events from given input device. | |
419 | */ | |
1da177e4 LT |
420 | int input_open_device(struct input_handle *handle) |
421 | { | |
0fbf87ca | 422 | struct input_dev *dev = handle->dev; |
8006479c | 423 | int retval; |
0fbf87ca | 424 | |
8006479c DT |
425 | retval = mutex_lock_interruptible(&dev->mutex); |
426 | if (retval) | |
427 | return retval; | |
428 | ||
429 | if (dev->going_away) { | |
430 | retval = -ENODEV; | |
431 | goto out; | |
432 | } | |
0fbf87ca | 433 | |
1da177e4 | 434 | handle->open++; |
0fbf87ca DT |
435 | |
436 | if (!dev->users++ && dev->open) | |
8006479c DT |
437 | retval = dev->open(dev); |
438 | ||
439 | if (retval) { | |
440 | dev->users--; | |
441 | if (!--handle->open) { | |
442 | /* | |
443 | * Make sure we are not delivering any more events | |
444 | * through this handle | |
445 | */ | |
82ba56c2 | 446 | synchronize_rcu(); |
8006479c DT |
447 | } |
448 | } | |
0fbf87ca | 449 | |
8006479c | 450 | out: |
e676c232 | 451 | mutex_unlock(&dev->mutex); |
8006479c | 452 | return retval; |
1da177e4 | 453 | } |
ca56fe07 | 454 | EXPORT_SYMBOL(input_open_device); |
1da177e4 | 455 | |
8006479c | 456 | int input_flush_device(struct input_handle *handle, struct file *file) |
1da177e4 | 457 | { |
8006479c DT |
458 | struct input_dev *dev = handle->dev; |
459 | int retval; | |
1da177e4 | 460 | |
8006479c DT |
461 | retval = mutex_lock_interruptible(&dev->mutex); |
462 | if (retval) | |
463 | return retval; | |
464 | ||
465 | if (dev->flush) | |
466 | retval = dev->flush(dev, file); | |
467 | ||
468 | mutex_unlock(&dev->mutex); | |
469 | return retval; | |
1da177e4 | 470 | } |
ca56fe07 | 471 | EXPORT_SYMBOL(input_flush_device); |
1da177e4 | 472 | |
8006479c DT |
473 | /** |
474 | * input_close_device - close input device | |
475 | * @handle: handle through which device is being accessed | |
476 | * | |
477 | * This function should be called by input handlers when they | |
478 | * want to stop receive events from given input device. | |
479 | */ | |
1da177e4 LT |
480 | void input_close_device(struct input_handle *handle) |
481 | { | |
0fbf87ca DT |
482 | struct input_dev *dev = handle->dev; |
483 | ||
e676c232 | 484 | mutex_lock(&dev->mutex); |
0fbf87ca | 485 | |
8006479c DT |
486 | __input_release_device(handle); |
487 | ||
0fbf87ca DT |
488 | if (!--dev->users && dev->close) |
489 | dev->close(dev); | |
8006479c DT |
490 | |
491 | if (!--handle->open) { | |
492 | /* | |
82ba56c2 | 493 | * synchronize_rcu() makes sure that input_pass_event() |
8006479c DT |
494 | * completed and that no more input events are delivered |
495 | * through this handle | |
496 | */ | |
82ba56c2 | 497 | synchronize_rcu(); |
8006479c | 498 | } |
0fbf87ca | 499 | |
e676c232 | 500 | mutex_unlock(&dev->mutex); |
1da177e4 | 501 | } |
ca56fe07 | 502 | EXPORT_SYMBOL(input_close_device); |
1da177e4 | 503 | |
8006479c DT |
504 | /* |
505 | * Prepare device for unregistering | |
506 | */ | |
507 | static void input_disconnect_device(struct input_dev *dev) | |
508 | { | |
509 | struct input_handle *handle; | |
510 | int code; | |
511 | ||
512 | /* | |
513 | * Mark device as going away. Note that we take dev->mutex here | |
514 | * not to protect access to dev->going_away but rather to ensure | |
515 | * that there are no threads in the middle of input_open_device() | |
516 | */ | |
517 | mutex_lock(&dev->mutex); | |
ffd0db97 | 518 | dev->going_away = true; |
8006479c DT |
519 | mutex_unlock(&dev->mutex); |
520 | ||
521 | spin_lock_irq(&dev->event_lock); | |
522 | ||
523 | /* | |
524 | * Simulate keyup events for all pressed keys so that handlers | |
525 | * are not left with "stuck" keys. The driver may continue | |
526 | * generate events even after we done here but they will not | |
527 | * reach any handlers. | |
528 | */ | |
529 | if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) { | |
530 | for (code = 0; code <= KEY_MAX; code++) { | |
531 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
f4f37c8e | 532 | __test_and_clear_bit(code, dev->key)) { |
8006479c DT |
533 | input_pass_event(dev, EV_KEY, code, 0); |
534 | } | |
535 | } | |
536 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
537 | } | |
538 | ||
539 | list_for_each_entry(handle, &dev->h_list, d_node) | |
540 | handle->open = 0; | |
541 | ||
542 | spin_unlock_irq(&dev->event_lock); | |
543 | } | |
544 | ||
c8e4c772 MR |
545 | static int input_fetch_keycode(struct input_dev *dev, int scancode) |
546 | { | |
547 | switch (dev->keycodesize) { | |
548 | case 1: | |
549 | return ((u8 *)dev->keycode)[scancode]; | |
550 | ||
551 | case 2: | |
552 | return ((u16 *)dev->keycode)[scancode]; | |
553 | ||
554 | default: | |
555 | return ((u32 *)dev->keycode)[scancode]; | |
556 | } | |
557 | } | |
558 | ||
559 | static int input_default_getkeycode(struct input_dev *dev, | |
560 | int scancode, int *keycode) | |
561 | { | |
562 | if (!dev->keycodesize) | |
563 | return -EINVAL; | |
564 | ||
f4f37c8e | 565 | if (scancode >= dev->keycodemax) |
c8e4c772 MR |
566 | return -EINVAL; |
567 | ||
568 | *keycode = input_fetch_keycode(dev, scancode); | |
569 | ||
570 | return 0; | |
571 | } | |
572 | ||
573 | static int input_default_setkeycode(struct input_dev *dev, | |
574 | int scancode, int keycode) | |
575 | { | |
576 | int old_keycode; | |
577 | int i; | |
578 | ||
f4f37c8e | 579 | if (scancode >= dev->keycodemax) |
c8e4c772 MR |
580 | return -EINVAL; |
581 | ||
582 | if (!dev->keycodesize) | |
583 | return -EINVAL; | |
584 | ||
585 | if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8))) | |
586 | return -EINVAL; | |
587 | ||
588 | switch (dev->keycodesize) { | |
589 | case 1: { | |
590 | u8 *k = (u8 *)dev->keycode; | |
591 | old_keycode = k[scancode]; | |
592 | k[scancode] = keycode; | |
593 | break; | |
594 | } | |
595 | case 2: { | |
596 | u16 *k = (u16 *)dev->keycode; | |
597 | old_keycode = k[scancode]; | |
598 | k[scancode] = keycode; | |
599 | break; | |
600 | } | |
601 | default: { | |
602 | u32 *k = (u32 *)dev->keycode; | |
603 | old_keycode = k[scancode]; | |
604 | k[scancode] = keycode; | |
605 | break; | |
606 | } | |
607 | } | |
608 | ||
609 | clear_bit(old_keycode, dev->keybit); | |
610 | set_bit(keycode, dev->keybit); | |
611 | ||
612 | for (i = 0; i < dev->keycodemax; i++) { | |
613 | if (input_fetch_keycode(dev, i) == old_keycode) { | |
614 | set_bit(old_keycode, dev->keybit); | |
615 | break; /* Setting the bit twice is useless, so break */ | |
616 | } | |
617 | } | |
618 | ||
619 | return 0; | |
620 | } | |
621 | ||
f4f37c8e DT |
622 | /** |
623 | * input_get_keycode - retrieve keycode currently mapped to a given scancode | |
624 | * @dev: input device which keymap is being queried | |
625 | * @scancode: scancode (or its equivalent for device in question) for which | |
626 | * keycode is needed | |
627 | * @keycode: result | |
628 | * | |
629 | * This function should be called by anyone interested in retrieving current | |
630 | * keymap. Presently keyboard and evdev handlers use it. | |
631 | */ | |
632 | int input_get_keycode(struct input_dev *dev, int scancode, int *keycode) | |
633 | { | |
634 | if (scancode < 0) | |
635 | return -EINVAL; | |
636 | ||
637 | return dev->getkeycode(dev, scancode, keycode); | |
638 | } | |
639 | EXPORT_SYMBOL(input_get_keycode); | |
640 | ||
641 | /** | |
642 | * input_get_keycode - assign new keycode to a given scancode | |
643 | * @dev: input device which keymap is being updated | |
644 | * @scancode: scancode (or its equivalent for device in question) | |
645 | * @keycode: new keycode to be assigned to the scancode | |
646 | * | |
647 | * This function should be called by anyone needing to update current | |
648 | * keymap. Presently keyboard and evdev handlers use it. | |
649 | */ | |
650 | int input_set_keycode(struct input_dev *dev, int scancode, int keycode) | |
651 | { | |
652 | unsigned long flags; | |
653 | int old_keycode; | |
654 | int retval; | |
655 | ||
656 | if (scancode < 0) | |
657 | return -EINVAL; | |
658 | ||
659 | if (keycode < 0 || keycode > KEY_MAX) | |
660 | return -EINVAL; | |
661 | ||
662 | spin_lock_irqsave(&dev->event_lock, flags); | |
663 | ||
664 | retval = dev->getkeycode(dev, scancode, &old_keycode); | |
665 | if (retval) | |
666 | goto out; | |
667 | ||
668 | retval = dev->setkeycode(dev, scancode, keycode); | |
669 | if (retval) | |
670 | goto out; | |
671 | ||
672 | /* | |
673 | * Simulate keyup event if keycode is not present | |
674 | * in the keymap anymore | |
675 | */ | |
676 | if (test_bit(EV_KEY, dev->evbit) && | |
677 | !is_event_supported(old_keycode, dev->keybit, KEY_MAX) && | |
678 | __test_and_clear_bit(old_keycode, dev->key)) { | |
679 | ||
680 | input_pass_event(dev, EV_KEY, old_keycode, 0); | |
681 | if (dev->sync) | |
682 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
683 | } | |
684 | ||
685 | out: | |
686 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
687 | ||
688 | return retval; | |
689 | } | |
690 | EXPORT_SYMBOL(input_set_keycode); | |
c8e4c772 | 691 | |
1da177e4 | 692 | #define MATCH_BIT(bit, max) \ |
7b19ada2 | 693 | for (i = 0; i < BITS_TO_LONGS(max); i++) \ |
1da177e4 LT |
694 | if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \ |
695 | break; \ | |
7b19ada2 | 696 | if (i != BITS_TO_LONGS(max)) \ |
1da177e4 LT |
697 | continue; |
698 | ||
66e66118 DT |
699 | static const struct input_device_id *input_match_device(const struct input_device_id *id, |
700 | struct input_dev *dev) | |
1da177e4 LT |
701 | { |
702 | int i; | |
703 | ||
704 | for (; id->flags || id->driver_info; id++) { | |
705 | ||
706 | if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) | |
ddc5d341 | 707 | if (id->bustype != dev->id.bustype) |
1da177e4 LT |
708 | continue; |
709 | ||
710 | if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) | |
ddc5d341 | 711 | if (id->vendor != dev->id.vendor) |
1da177e4 LT |
712 | continue; |
713 | ||
714 | if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) | |
ddc5d341 | 715 | if (id->product != dev->id.product) |
1da177e4 LT |
716 | continue; |
717 | ||
718 | if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) | |
ddc5d341 | 719 | if (id->version != dev->id.version) |
1da177e4 LT |
720 | continue; |
721 | ||
722 | MATCH_BIT(evbit, EV_MAX); | |
723 | MATCH_BIT(keybit, KEY_MAX); | |
724 | MATCH_BIT(relbit, REL_MAX); | |
725 | MATCH_BIT(absbit, ABS_MAX); | |
726 | MATCH_BIT(mscbit, MSC_MAX); | |
727 | MATCH_BIT(ledbit, LED_MAX); | |
728 | MATCH_BIT(sndbit, SND_MAX); | |
729 | MATCH_BIT(ffbit, FF_MAX); | |
ff13f98b | 730 | MATCH_BIT(swbit, SW_MAX); |
1da177e4 LT |
731 | |
732 | return id; | |
733 | } | |
734 | ||
735 | return NULL; | |
736 | } | |
737 | ||
5b2a0826 DT |
738 | static int input_attach_handler(struct input_dev *dev, struct input_handler *handler) |
739 | { | |
740 | const struct input_device_id *id; | |
741 | int error; | |
742 | ||
743 | if (handler->blacklist && input_match_device(handler->blacklist, dev)) | |
744 | return -ENODEV; | |
745 | ||
746 | id = input_match_device(handler->id_table, dev); | |
747 | if (!id) | |
748 | return -ENODEV; | |
749 | ||
750 | error = handler->connect(handler, dev, id); | |
751 | if (error && error != -ENODEV) | |
752 | printk(KERN_ERR | |
753 | "input: failed to attach handler %s to device %s, " | |
754 | "error: %d\n", | |
9657d75c | 755 | handler->name, kobject_name(&dev->dev.kobj), error); |
5b2a0826 DT |
756 | |
757 | return error; | |
758 | } | |
759 | ||
760 | ||
f96b434d DT |
761 | #ifdef CONFIG_PROC_FS |
762 | ||
763 | static struct proc_dir_entry *proc_bus_input_dir; | |
764 | static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); | |
765 | static int input_devices_state; | |
766 | ||
767 | static inline void input_wakeup_procfs_readers(void) | |
768 | { | |
769 | input_devices_state++; | |
770 | wake_up(&input_devices_poll_wait); | |
771 | } | |
772 | ||
969b21cd | 773 | static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait) |
f96b434d | 774 | { |
f96b434d | 775 | poll_wait(file, &input_devices_poll_wait, wait); |
fa886612 DT |
776 | if (file->f_version != input_devices_state) { |
777 | file->f_version = input_devices_state; | |
f96b434d | 778 | return POLLIN | POLLRDNORM; |
fa886612 | 779 | } |
1e0afb28 | 780 | |
f96b434d DT |
781 | return 0; |
782 | } | |
783 | ||
969b21cd DT |
784 | static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) |
785 | { | |
8006479c DT |
786 | if (mutex_lock_interruptible(&input_mutex)) |
787 | return NULL; | |
f96b434d | 788 | |
ad5d972c | 789 | return seq_list_start(&input_dev_list, *pos); |
969b21cd | 790 | } |
051b2fea | 791 | |
969b21cd DT |
792 | static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
793 | { | |
ad5d972c | 794 | return seq_list_next(v, &input_dev_list, pos); |
969b21cd | 795 | } |
f96b434d | 796 | |
969b21cd DT |
797 | static void input_devices_seq_stop(struct seq_file *seq, void *v) |
798 | { | |
8006479c | 799 | mutex_unlock(&input_mutex); |
969b21cd | 800 | } |
f96b434d | 801 | |
969b21cd DT |
802 | static void input_seq_print_bitmap(struct seq_file *seq, const char *name, |
803 | unsigned long *bitmap, int max) | |
804 | { | |
805 | int i; | |
051b2fea | 806 | |
7b19ada2 | 807 | for (i = BITS_TO_LONGS(max) - 1; i > 0; i--) |
969b21cd DT |
808 | if (bitmap[i]) |
809 | break; | |
f96b434d | 810 | |
969b21cd DT |
811 | seq_printf(seq, "B: %s=", name); |
812 | for (; i >= 0; i--) | |
813 | seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : ""); | |
814 | seq_putc(seq, '\n'); | |
815 | } | |
f96b434d | 816 | |
969b21cd DT |
817 | static int input_devices_seq_show(struct seq_file *seq, void *v) |
818 | { | |
819 | struct input_dev *dev = container_of(v, struct input_dev, node); | |
9657d75c | 820 | const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
969b21cd DT |
821 | struct input_handle *handle; |
822 | ||
823 | seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", | |
824 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); | |
825 | ||
826 | seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); | |
827 | seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : ""); | |
828 | seq_printf(seq, "S: Sysfs=%s\n", path ? path : ""); | |
15e03ae8 | 829 | seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : ""); |
969b21cd DT |
830 | seq_printf(seq, "H: Handlers="); |
831 | ||
832 | list_for_each_entry(handle, &dev->h_list, d_node) | |
833 | seq_printf(seq, "%s ", handle->name); | |
834 | seq_putc(seq, '\n'); | |
835 | ||
836 | input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); | |
837 | if (test_bit(EV_KEY, dev->evbit)) | |
838 | input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); | |
839 | if (test_bit(EV_REL, dev->evbit)) | |
840 | input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); | |
841 | if (test_bit(EV_ABS, dev->evbit)) | |
842 | input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); | |
843 | if (test_bit(EV_MSC, dev->evbit)) | |
844 | input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); | |
845 | if (test_bit(EV_LED, dev->evbit)) | |
846 | input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); | |
847 | if (test_bit(EV_SND, dev->evbit)) | |
848 | input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); | |
849 | if (test_bit(EV_FF, dev->evbit)) | |
850 | input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); | |
851 | if (test_bit(EV_SW, dev->evbit)) | |
852 | input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); | |
853 | ||
854 | seq_putc(seq, '\n'); | |
855 | ||
856 | kfree(path); | |
857 | return 0; | |
f96b434d DT |
858 | } |
859 | ||
cec69c37 | 860 | static const struct seq_operations input_devices_seq_ops = { |
969b21cd DT |
861 | .start = input_devices_seq_start, |
862 | .next = input_devices_seq_next, | |
863 | .stop = input_devices_seq_stop, | |
864 | .show = input_devices_seq_show, | |
865 | }; | |
866 | ||
867 | static int input_proc_devices_open(struct inode *inode, struct file *file) | |
f96b434d | 868 | { |
969b21cd DT |
869 | return seq_open(file, &input_devices_seq_ops); |
870 | } | |
871 | ||
2b8693c0 | 872 | static const struct file_operations input_devices_fileops = { |
969b21cd DT |
873 | .owner = THIS_MODULE, |
874 | .open = input_proc_devices_open, | |
875 | .poll = input_proc_devices_poll, | |
876 | .read = seq_read, | |
877 | .llseek = seq_lseek, | |
878 | .release = seq_release, | |
879 | }; | |
880 | ||
881 | static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) | |
882 | { | |
8006479c DT |
883 | if (mutex_lock_interruptible(&input_mutex)) |
884 | return NULL; | |
885 | ||
969b21cd | 886 | seq->private = (void *)(unsigned long)*pos; |
ad5d972c | 887 | return seq_list_start(&input_handler_list, *pos); |
969b21cd | 888 | } |
f96b434d | 889 | |
969b21cd DT |
890 | static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
891 | { | |
892 | seq->private = (void *)(unsigned long)(*pos + 1); | |
ad5d972c | 893 | return seq_list_next(v, &input_handler_list, pos); |
f96b434d DT |
894 | } |
895 | ||
969b21cd DT |
896 | static void input_handlers_seq_stop(struct seq_file *seq, void *v) |
897 | { | |
8006479c | 898 | mutex_unlock(&input_mutex); |
969b21cd DT |
899 | } |
900 | ||
901 | static int input_handlers_seq_show(struct seq_file *seq, void *v) | |
902 | { | |
903 | struct input_handler *handler = container_of(v, struct input_handler, node); | |
904 | ||
905 | seq_printf(seq, "N: Number=%ld Name=%s", | |
906 | (unsigned long)seq->private, handler->name); | |
907 | if (handler->fops) | |
908 | seq_printf(seq, " Minor=%d", handler->minor); | |
909 | seq_putc(seq, '\n'); | |
910 | ||
911 | return 0; | |
912 | } | |
cec69c37 | 913 | static const struct seq_operations input_handlers_seq_ops = { |
969b21cd DT |
914 | .start = input_handlers_seq_start, |
915 | .next = input_handlers_seq_next, | |
916 | .stop = input_handlers_seq_stop, | |
917 | .show = input_handlers_seq_show, | |
918 | }; | |
919 | ||
920 | static int input_proc_handlers_open(struct inode *inode, struct file *file) | |
921 | { | |
922 | return seq_open(file, &input_handlers_seq_ops); | |
923 | } | |
924 | ||
2b8693c0 | 925 | static const struct file_operations input_handlers_fileops = { |
969b21cd DT |
926 | .owner = THIS_MODULE, |
927 | .open = input_proc_handlers_open, | |
928 | .read = seq_read, | |
929 | .llseek = seq_lseek, | |
930 | .release = seq_release, | |
931 | }; | |
f96b434d DT |
932 | |
933 | static int __init input_proc_init(void) | |
934 | { | |
935 | struct proc_dir_entry *entry; | |
936 | ||
9c37066d | 937 | proc_bus_input_dir = proc_mkdir("bus/input", NULL); |
f96b434d DT |
938 | if (!proc_bus_input_dir) |
939 | return -ENOMEM; | |
940 | ||
c7705f34 DL |
941 | entry = proc_create("devices", 0, proc_bus_input_dir, |
942 | &input_devices_fileops); | |
f96b434d DT |
943 | if (!entry) |
944 | goto fail1; | |
945 | ||
c7705f34 DL |
946 | entry = proc_create("handlers", 0, proc_bus_input_dir, |
947 | &input_handlers_fileops); | |
f96b434d DT |
948 | if (!entry) |
949 | goto fail2; | |
950 | ||
f96b434d DT |
951 | return 0; |
952 | ||
953 | fail2: remove_proc_entry("devices", proc_bus_input_dir); | |
9c37066d | 954 | fail1: remove_proc_entry("bus/input", NULL); |
f96b434d DT |
955 | return -ENOMEM; |
956 | } | |
957 | ||
beffbdc2 | 958 | static void input_proc_exit(void) |
f96b434d DT |
959 | { |
960 | remove_proc_entry("devices", proc_bus_input_dir); | |
961 | remove_proc_entry("handlers", proc_bus_input_dir); | |
9c37066d | 962 | remove_proc_entry("bus/input", NULL); |
f96b434d DT |
963 | } |
964 | ||
965 | #else /* !CONFIG_PROC_FS */ | |
966 | static inline void input_wakeup_procfs_readers(void) { } | |
967 | static inline int input_proc_init(void) { return 0; } | |
968 | static inline void input_proc_exit(void) { } | |
969 | #endif | |
970 | ||
9657d75c DT |
971 | #define INPUT_DEV_STRING_ATTR_SHOW(name) \ |
972 | static ssize_t input_dev_show_##name(struct device *dev, \ | |
973 | struct device_attribute *attr, \ | |
974 | char *buf) \ | |
975 | { \ | |
976 | struct input_dev *input_dev = to_input_dev(dev); \ | |
977 | \ | |
978 | return scnprintf(buf, PAGE_SIZE, "%s\n", \ | |
979 | input_dev->name ? input_dev->name : ""); \ | |
980 | } \ | |
981 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL) | |
5c1e9a6a DT |
982 | |
983 | INPUT_DEV_STRING_ATTR_SHOW(name); | |
984 | INPUT_DEV_STRING_ATTR_SHOW(phys); | |
985 | INPUT_DEV_STRING_ATTR_SHOW(uniq); | |
986 | ||
ac648a6a DT |
987 | static int input_print_modalias_bits(char *buf, int size, |
988 | char name, unsigned long *bm, | |
989 | unsigned int min_bit, unsigned int max_bit) | |
1d8f430c | 990 | { |
ac648a6a | 991 | int len = 0, i; |
1d8f430c | 992 | |
ac648a6a DT |
993 | len += snprintf(buf, max(size, 0), "%c", name); |
994 | for (i = min_bit; i < max_bit; i++) | |
7b19ada2 | 995 | if (bm[BIT_WORD(i)] & BIT_MASK(i)) |
ac648a6a | 996 | len += snprintf(buf + len, max(size - len, 0), "%X,", i); |
1d8f430c RR |
997 | return len; |
998 | } | |
999 | ||
2db66876 DT |
1000 | static int input_print_modalias(char *buf, int size, struct input_dev *id, |
1001 | int add_cr) | |
1d8f430c | 1002 | { |
bd37e5a9 | 1003 | int len; |
1d8f430c | 1004 | |
ac648a6a DT |
1005 | len = snprintf(buf, max(size, 0), |
1006 | "input:b%04Xv%04Xp%04Xe%04X-", | |
1007 | id->id.bustype, id->id.vendor, | |
1008 | id->id.product, id->id.version); | |
1009 | ||
1010 | len += input_print_modalias_bits(buf + len, size - len, | |
1011 | 'e', id->evbit, 0, EV_MAX); | |
1012 | len += input_print_modalias_bits(buf + len, size - len, | |
1013 | 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); | |
1014 | len += input_print_modalias_bits(buf + len, size - len, | |
1015 | 'r', id->relbit, 0, REL_MAX); | |
1016 | len += input_print_modalias_bits(buf + len, size - len, | |
1017 | 'a', id->absbit, 0, ABS_MAX); | |
1018 | len += input_print_modalias_bits(buf + len, size - len, | |
1019 | 'm', id->mscbit, 0, MSC_MAX); | |
1020 | len += input_print_modalias_bits(buf + len, size - len, | |
1021 | 'l', id->ledbit, 0, LED_MAX); | |
1022 | len += input_print_modalias_bits(buf + len, size - len, | |
1023 | 's', id->sndbit, 0, SND_MAX); | |
1024 | len += input_print_modalias_bits(buf + len, size - len, | |
1025 | 'f', id->ffbit, 0, FF_MAX); | |
1026 | len += input_print_modalias_bits(buf + len, size - len, | |
1027 | 'w', id->swbit, 0, SW_MAX); | |
2db66876 DT |
1028 | |
1029 | if (add_cr) | |
ac648a6a | 1030 | len += snprintf(buf + len, max(size - len, 0), "\n"); |
2db66876 | 1031 | |
bd37e5a9 KS |
1032 | return len; |
1033 | } | |
1034 | ||
9657d75c DT |
1035 | static ssize_t input_dev_show_modalias(struct device *dev, |
1036 | struct device_attribute *attr, | |
1037 | char *buf) | |
bd37e5a9 KS |
1038 | { |
1039 | struct input_dev *id = to_input_dev(dev); | |
1040 | ssize_t len; | |
1041 | ||
2db66876 DT |
1042 | len = input_print_modalias(buf, PAGE_SIZE, id, 1); |
1043 | ||
8a3cf456 | 1044 | return min_t(int, len, PAGE_SIZE); |
1d8f430c | 1045 | } |
9657d75c | 1046 | static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); |
1d8f430c | 1047 | |
629b77a4 | 1048 | static struct attribute *input_dev_attrs[] = { |
9657d75c DT |
1049 | &dev_attr_name.attr, |
1050 | &dev_attr_phys.attr, | |
1051 | &dev_attr_uniq.attr, | |
1052 | &dev_attr_modalias.attr, | |
629b77a4 GKH |
1053 | NULL |
1054 | }; | |
1055 | ||
bd0ef235 | 1056 | static struct attribute_group input_dev_attr_group = { |
629b77a4 | 1057 | .attrs = input_dev_attrs, |
5c1e9a6a DT |
1058 | }; |
1059 | ||
9657d75c DT |
1060 | #define INPUT_DEV_ID_ATTR(name) \ |
1061 | static ssize_t input_dev_show_id_##name(struct device *dev, \ | |
1062 | struct device_attribute *attr, \ | |
1063 | char *buf) \ | |
1064 | { \ | |
1065 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1066 | return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \ | |
1067 | } \ | |
1068 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL) | |
5c1e9a6a DT |
1069 | |
1070 | INPUT_DEV_ID_ATTR(bustype); | |
1071 | INPUT_DEV_ID_ATTR(vendor); | |
1072 | INPUT_DEV_ID_ATTR(product); | |
1073 | INPUT_DEV_ID_ATTR(version); | |
1074 | ||
1075 | static struct attribute *input_dev_id_attrs[] = { | |
9657d75c DT |
1076 | &dev_attr_bustype.attr, |
1077 | &dev_attr_vendor.attr, | |
1078 | &dev_attr_product.attr, | |
1079 | &dev_attr_version.attr, | |
5c1e9a6a DT |
1080 | NULL |
1081 | }; | |
1082 | ||
1083 | static struct attribute_group input_dev_id_attr_group = { | |
1084 | .name = "id", | |
1085 | .attrs = input_dev_id_attrs, | |
1086 | }; | |
1087 | ||
969b21cd DT |
1088 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1089 | int max, int add_cr) | |
1090 | { | |
1091 | int i; | |
1092 | int len = 0; | |
1093 | ||
7b19ada2 | 1094 | for (i = BITS_TO_LONGS(max) - 1; i > 0; i--) |
969b21cd DT |
1095 | if (bitmap[i]) |
1096 | break; | |
1097 | ||
1098 | for (; i >= 0; i--) | |
1099 | len += snprintf(buf + len, max(buf_size - len, 0), | |
1100 | "%lx%s", bitmap[i], i > 0 ? " " : ""); | |
1101 | ||
1102 | if (add_cr) | |
1103 | len += snprintf(buf + len, max(buf_size - len, 0), "\n"); | |
1104 | ||
1105 | return len; | |
1106 | } | |
1107 | ||
9657d75c DT |
1108 | #define INPUT_DEV_CAP_ATTR(ev, bm) \ |
1109 | static ssize_t input_dev_show_cap_##bm(struct device *dev, \ | |
1110 | struct device_attribute *attr, \ | |
1111 | char *buf) \ | |
1112 | { \ | |
1113 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1114 | int len = input_print_bitmap(buf, PAGE_SIZE, \ | |
1115 | input_dev->bm##bit, ev##_MAX, 1); \ | |
1116 | return min_t(int, len, PAGE_SIZE); \ | |
1117 | } \ | |
1118 | static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL) | |
5c1e9a6a DT |
1119 | |
1120 | INPUT_DEV_CAP_ATTR(EV, ev); | |
1121 | INPUT_DEV_CAP_ATTR(KEY, key); | |
1122 | INPUT_DEV_CAP_ATTR(REL, rel); | |
1123 | INPUT_DEV_CAP_ATTR(ABS, abs); | |
1124 | INPUT_DEV_CAP_ATTR(MSC, msc); | |
1125 | INPUT_DEV_CAP_ATTR(LED, led); | |
1126 | INPUT_DEV_CAP_ATTR(SND, snd); | |
1127 | INPUT_DEV_CAP_ATTR(FF, ff); | |
1128 | INPUT_DEV_CAP_ATTR(SW, sw); | |
1129 | ||
1130 | static struct attribute *input_dev_caps_attrs[] = { | |
9657d75c DT |
1131 | &dev_attr_ev.attr, |
1132 | &dev_attr_key.attr, | |
1133 | &dev_attr_rel.attr, | |
1134 | &dev_attr_abs.attr, | |
1135 | &dev_attr_msc.attr, | |
1136 | &dev_attr_led.attr, | |
1137 | &dev_attr_snd.attr, | |
1138 | &dev_attr_ff.attr, | |
1139 | &dev_attr_sw.attr, | |
5c1e9a6a DT |
1140 | NULL |
1141 | }; | |
1142 | ||
1143 | static struct attribute_group input_dev_caps_attr_group = { | |
1144 | .name = "capabilities", | |
1145 | .attrs = input_dev_caps_attrs, | |
1146 | }; | |
1147 | ||
cb9def4d DT |
1148 | static struct attribute_group *input_dev_attr_groups[] = { |
1149 | &input_dev_attr_group, | |
1150 | &input_dev_id_attr_group, | |
1151 | &input_dev_caps_attr_group, | |
1152 | NULL | |
1153 | }; | |
1154 | ||
9657d75c | 1155 | static void input_dev_release(struct device *device) |
d19fbe8a | 1156 | { |
9657d75c | 1157 | struct input_dev *dev = to_input_dev(device); |
d19fbe8a | 1158 | |
509ca1a9 | 1159 | input_ff_destroy(dev); |
d19fbe8a | 1160 | kfree(dev); |
509ca1a9 | 1161 | |
d19fbe8a DT |
1162 | module_put(THIS_MODULE); |
1163 | } | |
1164 | ||
a7fadbe1 | 1165 | /* |
312c004d | 1166 | * Input uevent interface - loading event handlers based on |
a7fadbe1 DT |
1167 | * device bitfields. |
1168 | */ | |
7eff2e7a | 1169 | static int input_add_uevent_bm_var(struct kobj_uevent_env *env, |
ac648a6a | 1170 | const char *name, unsigned long *bitmap, int max) |
a7fadbe1 | 1171 | { |
7eff2e7a | 1172 | int len; |
a7fadbe1 | 1173 | |
7eff2e7a | 1174 | if (add_uevent_var(env, "%s=", name)) |
a7fadbe1 DT |
1175 | return -ENOMEM; |
1176 | ||
7eff2e7a KS |
1177 | len = input_print_bitmap(&env->buf[env->buflen - 1], |
1178 | sizeof(env->buf) - env->buflen, | |
1179 | bitmap, max, 0); | |
1180 | if (len >= (sizeof(env->buf) - env->buflen)) | |
a7fadbe1 DT |
1181 | return -ENOMEM; |
1182 | ||
7eff2e7a | 1183 | env->buflen += len; |
a7fadbe1 DT |
1184 | return 0; |
1185 | } | |
1186 | ||
7eff2e7a | 1187 | static int input_add_uevent_modalias_var(struct kobj_uevent_env *env, |
ac648a6a DT |
1188 | struct input_dev *dev) |
1189 | { | |
7eff2e7a | 1190 | int len; |
ac648a6a | 1191 | |
7eff2e7a | 1192 | if (add_uevent_var(env, "MODALIAS=")) |
ac648a6a DT |
1193 | return -ENOMEM; |
1194 | ||
7eff2e7a KS |
1195 | len = input_print_modalias(&env->buf[env->buflen - 1], |
1196 | sizeof(env->buf) - env->buflen, | |
1197 | dev, 0); | |
1198 | if (len >= (sizeof(env->buf) - env->buflen)) | |
ac648a6a DT |
1199 | return -ENOMEM; |
1200 | ||
7eff2e7a | 1201 | env->buflen += len; |
ac648a6a DT |
1202 | return 0; |
1203 | } | |
1204 | ||
a7fadbe1 DT |
1205 | #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \ |
1206 | do { \ | |
7eff2e7a | 1207 | int err = add_uevent_var(env, fmt, val); \ |
a7fadbe1 DT |
1208 | if (err) \ |
1209 | return err; \ | |
1210 | } while (0) | |
1211 | ||
1212 | #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \ | |
1213 | do { \ | |
7eff2e7a | 1214 | int err = input_add_uevent_bm_var(env, name, bm, max); \ |
a7fadbe1 DT |
1215 | if (err) \ |
1216 | return err; \ | |
1217 | } while (0) | |
1218 | ||
ac648a6a DT |
1219 | #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \ |
1220 | do { \ | |
7eff2e7a | 1221 | int err = input_add_uevent_modalias_var(env, dev); \ |
ac648a6a DT |
1222 | if (err) \ |
1223 | return err; \ | |
1224 | } while (0) | |
1225 | ||
7eff2e7a | 1226 | static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env) |
a7fadbe1 | 1227 | { |
9657d75c | 1228 | struct input_dev *dev = to_input_dev(device); |
a7fadbe1 DT |
1229 | |
1230 | INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x", | |
1231 | dev->id.bustype, dev->id.vendor, | |
1232 | dev->id.product, dev->id.version); | |
1233 | if (dev->name) | |
1234 | INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); | |
1235 | if (dev->phys) | |
1236 | INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); | |
08de1f04 | 1237 | if (dev->uniq) |
a7fadbe1 DT |
1238 | INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); |
1239 | ||
1240 | INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX); | |
1241 | if (test_bit(EV_KEY, dev->evbit)) | |
1242 | INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX); | |
1243 | if (test_bit(EV_REL, dev->evbit)) | |
1244 | INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX); | |
1245 | if (test_bit(EV_ABS, dev->evbit)) | |
1246 | INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX); | |
1247 | if (test_bit(EV_MSC, dev->evbit)) | |
1248 | INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX); | |
1249 | if (test_bit(EV_LED, dev->evbit)) | |
1250 | INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX); | |
1251 | if (test_bit(EV_SND, dev->evbit)) | |
1252 | INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX); | |
1253 | if (test_bit(EV_FF, dev->evbit)) | |
1254 | INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX); | |
1255 | if (test_bit(EV_SW, dev->evbit)) | |
1256 | INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); | |
1257 | ||
ac648a6a | 1258 | INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); |
a7fadbe1 DT |
1259 | |
1260 | return 0; | |
1261 | } | |
1262 | ||
ffd0db97 DT |
1263 | #define INPUT_DO_TOGGLE(dev, type, bits, on) \ |
1264 | do { \ | |
1265 | int i; \ | |
1266 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1267 | break; \ | |
1268 | for (i = 0; i < type##_MAX; i++) { \ | |
1269 | if (!test_bit(i, dev->bits##bit) || \ | |
1270 | !test_bit(i, dev->bits)) \ | |
1271 | continue; \ | |
1272 | dev->event(dev, EV_##type, i, on); \ | |
1273 | } \ | |
1274 | } while (0) | |
1275 | ||
1276 | static void input_dev_reset(struct input_dev *dev, bool activate) | |
1277 | { | |
1278 | if (!dev->event) | |
1279 | return; | |
1280 | ||
1281 | INPUT_DO_TOGGLE(dev, LED, led, activate); | |
1282 | INPUT_DO_TOGGLE(dev, SND, snd, activate); | |
1283 | ||
1284 | if (activate && test_bit(EV_REP, dev->evbit)) { | |
1285 | dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]); | |
1286 | dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]); | |
1287 | } | |
1288 | } | |
1289 | ||
1290 | #ifdef CONFIG_PM | |
1291 | static int input_dev_suspend(struct device *dev) | |
1292 | { | |
1293 | struct input_dev *input_dev = to_input_dev(dev); | |
1294 | ||
1295 | mutex_lock(&input_dev->mutex); | |
1296 | input_dev_reset(input_dev, false); | |
1297 | mutex_unlock(&input_dev->mutex); | |
1298 | ||
1299 | return 0; | |
1300 | } | |
1301 | ||
1302 | static int input_dev_resume(struct device *dev) | |
1303 | { | |
1304 | struct input_dev *input_dev = to_input_dev(dev); | |
1305 | ||
1306 | mutex_lock(&input_dev->mutex); | |
1307 | input_dev_reset(input_dev, true); | |
1308 | mutex_unlock(&input_dev->mutex); | |
1309 | ||
1310 | return 0; | |
1311 | } | |
1312 | ||
1313 | static const struct dev_pm_ops input_dev_pm_ops = { | |
1314 | .suspend = input_dev_suspend, | |
1315 | .resume = input_dev_resume, | |
1316 | .poweroff = input_dev_suspend, | |
1317 | .restore = input_dev_resume, | |
1318 | }; | |
1319 | #endif /* CONFIG_PM */ | |
1320 | ||
9657d75c DT |
1321 | static struct device_type input_dev_type = { |
1322 | .groups = input_dev_attr_groups, | |
1323 | .release = input_dev_release, | |
1324 | .uevent = input_dev_uevent, | |
ffd0db97 DT |
1325 | #ifdef CONFIG_PM |
1326 | .pm = &input_dev_pm_ops, | |
1327 | #endif | |
9657d75c DT |
1328 | }; |
1329 | ||
aa5ed63e KS |
1330 | static char *input_nodename(struct device *dev) |
1331 | { | |
1332 | return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev)); | |
1333 | } | |
1334 | ||
ea9f240b | 1335 | struct class input_class = { |
9657d75c | 1336 | .name = "input", |
aa5ed63e | 1337 | .nodename = input_nodename, |
d19fbe8a | 1338 | }; |
ca56fe07 | 1339 | EXPORT_SYMBOL_GPL(input_class); |
d19fbe8a | 1340 | |
1447190e DT |
1341 | /** |
1342 | * input_allocate_device - allocate memory for new input device | |
1343 | * | |
1344 | * Returns prepared struct input_dev or NULL. | |
1345 | * | |
1346 | * NOTE: Use input_free_device() to free devices that have not been | |
1347 | * registered; input_unregister_device() should be used for already | |
1348 | * registered devices. | |
1349 | */ | |
d19fbe8a DT |
1350 | struct input_dev *input_allocate_device(void) |
1351 | { | |
1352 | struct input_dev *dev; | |
1353 | ||
1354 | dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); | |
1355 | if (dev) { | |
9657d75c DT |
1356 | dev->dev.type = &input_dev_type; |
1357 | dev->dev.class = &input_class; | |
1358 | device_initialize(&dev->dev); | |
f60d2b11 | 1359 | mutex_init(&dev->mutex); |
8006479c | 1360 | spin_lock_init(&dev->event_lock); |
d19fbe8a DT |
1361 | INIT_LIST_HEAD(&dev->h_list); |
1362 | INIT_LIST_HEAD(&dev->node); | |
655816e4 DT |
1363 | |
1364 | __module_get(THIS_MODULE); | |
d19fbe8a DT |
1365 | } |
1366 | ||
1367 | return dev; | |
1368 | } | |
ca56fe07 | 1369 | EXPORT_SYMBOL(input_allocate_device); |
d19fbe8a | 1370 | |
1447190e DT |
1371 | /** |
1372 | * input_free_device - free memory occupied by input_dev structure | |
1373 | * @dev: input device to free | |
1374 | * | |
1375 | * This function should only be used if input_register_device() | |
1376 | * was not called yet or if it failed. Once device was registered | |
1377 | * use input_unregister_device() and memory will be freed once last | |
8006479c | 1378 | * reference to the device is dropped. |
1447190e DT |
1379 | * |
1380 | * Device should be allocated by input_allocate_device(). | |
1381 | * | |
1382 | * NOTE: If there are references to the input device then memory | |
1383 | * will not be freed until last reference is dropped. | |
1384 | */ | |
f60d2b11 DT |
1385 | void input_free_device(struct input_dev *dev) |
1386 | { | |
54f9e36c | 1387 | if (dev) |
f60d2b11 | 1388 | input_put_device(dev); |
f60d2b11 | 1389 | } |
ca56fe07 | 1390 | EXPORT_SYMBOL(input_free_device); |
f60d2b11 | 1391 | |
534565f2 DT |
1392 | /** |
1393 | * input_set_capability - mark device as capable of a certain event | |
1394 | * @dev: device that is capable of emitting or accepting event | |
1395 | * @type: type of the event (EV_KEY, EV_REL, etc...) | |
1396 | * @code: event code | |
1397 | * | |
1398 | * In addition to setting up corresponding bit in appropriate capability | |
1399 | * bitmap the function also adjusts dev->evbit. | |
1400 | */ | |
1401 | void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code) | |
1402 | { | |
1403 | switch (type) { | |
1404 | case EV_KEY: | |
1405 | __set_bit(code, dev->keybit); | |
1406 | break; | |
1407 | ||
1408 | case EV_REL: | |
1409 | __set_bit(code, dev->relbit); | |
1410 | break; | |
1411 | ||
1412 | case EV_ABS: | |
1413 | __set_bit(code, dev->absbit); | |
1414 | break; | |
1415 | ||
1416 | case EV_MSC: | |
1417 | __set_bit(code, dev->mscbit); | |
1418 | break; | |
1419 | ||
1420 | case EV_SW: | |
1421 | __set_bit(code, dev->swbit); | |
1422 | break; | |
1423 | ||
1424 | case EV_LED: | |
1425 | __set_bit(code, dev->ledbit); | |
1426 | break; | |
1427 | ||
1428 | case EV_SND: | |
1429 | __set_bit(code, dev->sndbit); | |
1430 | break; | |
1431 | ||
1432 | case EV_FF: | |
1433 | __set_bit(code, dev->ffbit); | |
1434 | break; | |
1435 | ||
22d1c398 DES |
1436 | case EV_PWR: |
1437 | /* do nothing */ | |
1438 | break; | |
1439 | ||
534565f2 DT |
1440 | default: |
1441 | printk(KERN_ERR | |
1442 | "input_set_capability: unknown type %u (code %u)\n", | |
1443 | type, code); | |
1444 | dump_stack(); | |
1445 | return; | |
1446 | } | |
1447 | ||
1448 | __set_bit(type, dev->evbit); | |
1449 | } | |
1450 | EXPORT_SYMBOL(input_set_capability); | |
1451 | ||
8006479c DT |
1452 | /** |
1453 | * input_register_device - register device with input core | |
1454 | * @dev: device to be registered | |
1455 | * | |
1456 | * This function registers device with input core. The device must be | |
1457 | * allocated with input_allocate_device() and all it's capabilities | |
1458 | * set up before registering. | |
1459 | * If function fails the device must be freed with input_free_device(). | |
1460 | * Once device has been successfully registered it can be unregistered | |
1461 | * with input_unregister_device(); input_free_device() should not be | |
1462 | * called in this case. | |
1463 | */ | |
5f945489 | 1464 | int input_register_device(struct input_dev *dev) |
1da177e4 | 1465 | { |
bd0ef235 | 1466 | static atomic_t input_no = ATOMIC_INIT(0); |
1da177e4 | 1467 | struct input_handler *handler; |
bd0ef235 DT |
1468 | const char *path; |
1469 | int error; | |
1da177e4 | 1470 | |
8006479c | 1471 | __set_bit(EV_SYN, dev->evbit); |
0fbf87ca | 1472 | |
1da177e4 LT |
1473 | /* |
1474 | * If delay and period are pre-set by the driver, then autorepeating | |
1475 | * is handled by the driver itself and we don't do it in input.c. | |
1476 | */ | |
1477 | ||
1478 | init_timer(&dev->timer); | |
1479 | if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { | |
1480 | dev->timer.data = (long) dev; | |
1481 | dev->timer.function = input_repeat_key; | |
1482 | dev->rep[REP_DELAY] = 250; | |
1483 | dev->rep[REP_PERIOD] = 33; | |
1484 | } | |
1485 | ||
c8e4c772 MR |
1486 | if (!dev->getkeycode) |
1487 | dev->getkeycode = input_default_getkeycode; | |
1488 | ||
1489 | if (!dev->setkeycode) | |
1490 | dev->setkeycode = input_default_setkeycode; | |
1491 | ||
a6c2490f KS |
1492 | dev_set_name(&dev->dev, "input%ld", |
1493 | (unsigned long) atomic_inc_return(&input_no) - 1); | |
bd0ef235 | 1494 | |
9657d75c | 1495 | error = device_add(&dev->dev); |
bd0ef235 DT |
1496 | if (error) |
1497 | return error; | |
1498 | ||
9657d75c | 1499 | path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
bd0ef235 DT |
1500 | printk(KERN_INFO "input: %s as %s\n", |
1501 | dev->name ? dev->name : "Unspecified device", path ? path : "N/A"); | |
1502 | kfree(path); | |
10204020 | 1503 | |
8006479c DT |
1504 | error = mutex_lock_interruptible(&input_mutex); |
1505 | if (error) { | |
1506 | device_del(&dev->dev); | |
1507 | return error; | |
1508 | } | |
1509 | ||
1510 | list_add_tail(&dev->node, &input_dev_list); | |
1511 | ||
1da177e4 | 1512 | list_for_each_entry(handler, &input_handler_list, node) |
5b2a0826 | 1513 | input_attach_handler(dev, handler); |
1da177e4 | 1514 | |
f96b434d | 1515 | input_wakeup_procfs_readers(); |
5f945489 | 1516 | |
8006479c DT |
1517 | mutex_unlock(&input_mutex); |
1518 | ||
5f945489 | 1519 | return 0; |
1da177e4 | 1520 | } |
ca56fe07 | 1521 | EXPORT_SYMBOL(input_register_device); |
1da177e4 | 1522 | |
8006479c DT |
1523 | /** |
1524 | * input_unregister_device - unregister previously registered device | |
1525 | * @dev: device to be unregistered | |
1526 | * | |
1527 | * This function unregisters an input device. Once device is unregistered | |
1528 | * the caller should not try to access it as it may get freed at any moment. | |
1529 | */ | |
1da177e4 LT |
1530 | void input_unregister_device(struct input_dev *dev) |
1531 | { | |
5b2a0826 | 1532 | struct input_handle *handle, *next; |
1da177e4 | 1533 | |
8006479c | 1534 | input_disconnect_device(dev); |
1da177e4 | 1535 | |
8006479c | 1536 | mutex_lock(&input_mutex); |
1da177e4 | 1537 | |
5b2a0826 | 1538 | list_for_each_entry_safe(handle, next, &dev->h_list, d_node) |
1da177e4 | 1539 | handle->handler->disconnect(handle); |
5b2a0826 | 1540 | WARN_ON(!list_empty(&dev->h_list)); |
1da177e4 | 1541 | |
8006479c | 1542 | del_timer_sync(&dev->timer); |
1da177e4 LT |
1543 | list_del_init(&dev->node); |
1544 | ||
f96b434d | 1545 | input_wakeup_procfs_readers(); |
8006479c DT |
1546 | |
1547 | mutex_unlock(&input_mutex); | |
1548 | ||
1549 | device_unregister(&dev->dev); | |
1da177e4 | 1550 | } |
ca56fe07 | 1551 | EXPORT_SYMBOL(input_unregister_device); |
1da177e4 | 1552 | |
8006479c DT |
1553 | /** |
1554 | * input_register_handler - register a new input handler | |
1555 | * @handler: handler to be registered | |
1556 | * | |
1557 | * This function registers a new input handler (interface) for input | |
1558 | * devices in the system and attaches it to all input devices that | |
1559 | * are compatible with the handler. | |
1560 | */ | |
4263cf0f | 1561 | int input_register_handler(struct input_handler *handler) |
1da177e4 LT |
1562 | { |
1563 | struct input_dev *dev; | |
8006479c DT |
1564 | int retval; |
1565 | ||
1566 | retval = mutex_lock_interruptible(&input_mutex); | |
1567 | if (retval) | |
1568 | return retval; | |
1da177e4 | 1569 | |
1da177e4 LT |
1570 | INIT_LIST_HEAD(&handler->h_list); |
1571 | ||
4263cf0f | 1572 | if (handler->fops != NULL) { |
8006479c DT |
1573 | if (input_table[handler->minor >> 5]) { |
1574 | retval = -EBUSY; | |
1575 | goto out; | |
1576 | } | |
1da177e4 | 1577 | input_table[handler->minor >> 5] = handler; |
4263cf0f | 1578 | } |
1da177e4 LT |
1579 | |
1580 | list_add_tail(&handler->node, &input_handler_list); | |
1581 | ||
1582 | list_for_each_entry(dev, &input_dev_list, node) | |
5b2a0826 | 1583 | input_attach_handler(dev, handler); |
1da177e4 | 1584 | |
f96b434d | 1585 | input_wakeup_procfs_readers(); |
8006479c DT |
1586 | |
1587 | out: | |
1588 | mutex_unlock(&input_mutex); | |
1589 | return retval; | |
1da177e4 | 1590 | } |
ca56fe07 | 1591 | EXPORT_SYMBOL(input_register_handler); |
1da177e4 | 1592 | |
8006479c DT |
1593 | /** |
1594 | * input_unregister_handler - unregisters an input handler | |
1595 | * @handler: handler to be unregistered | |
1596 | * | |
1597 | * This function disconnects a handler from its input devices and | |
1598 | * removes it from lists of known handlers. | |
1599 | */ | |
1da177e4 LT |
1600 | void input_unregister_handler(struct input_handler *handler) |
1601 | { | |
5b2a0826 | 1602 | struct input_handle *handle, *next; |
1da177e4 | 1603 | |
8006479c DT |
1604 | mutex_lock(&input_mutex); |
1605 | ||
5b2a0826 | 1606 | list_for_each_entry_safe(handle, next, &handler->h_list, h_node) |
1da177e4 | 1607 | handler->disconnect(handle); |
5b2a0826 | 1608 | WARN_ON(!list_empty(&handler->h_list)); |
1da177e4 LT |
1609 | |
1610 | list_del_init(&handler->node); | |
1611 | ||
1612 | if (handler->fops != NULL) | |
1613 | input_table[handler->minor >> 5] = NULL; | |
1614 | ||
f96b434d | 1615 | input_wakeup_procfs_readers(); |
8006479c DT |
1616 | |
1617 | mutex_unlock(&input_mutex); | |
1da177e4 | 1618 | } |
ca56fe07 | 1619 | EXPORT_SYMBOL(input_unregister_handler); |
1da177e4 | 1620 | |
8006479c DT |
1621 | /** |
1622 | * input_register_handle - register a new input handle | |
1623 | * @handle: handle to register | |
1624 | * | |
1625 | * This function puts a new input handle onto device's | |
1626 | * and handler's lists so that events can flow through | |
1627 | * it once it is opened using input_open_device(). | |
1628 | * | |
1629 | * This function is supposed to be called from handler's | |
1630 | * connect() method. | |
1631 | */ | |
5b2a0826 DT |
1632 | int input_register_handle(struct input_handle *handle) |
1633 | { | |
1634 | struct input_handler *handler = handle->handler; | |
8006479c DT |
1635 | struct input_dev *dev = handle->dev; |
1636 | int error; | |
1637 | ||
1638 | /* | |
1639 | * We take dev->mutex here to prevent race with | |
1640 | * input_release_device(). | |
1641 | */ | |
1642 | error = mutex_lock_interruptible(&dev->mutex); | |
1643 | if (error) | |
1644 | return error; | |
1645 | list_add_tail_rcu(&handle->d_node, &dev->h_list); | |
1646 | mutex_unlock(&dev->mutex); | |
5b2a0826 | 1647 | |
8006479c DT |
1648 | /* |
1649 | * Since we are supposed to be called from ->connect() | |
1650 | * which is mutually exclusive with ->disconnect() | |
1651 | * we can't be racing with input_unregister_handle() | |
1652 | * and so separate lock is not needed here. | |
1653 | */ | |
5b2a0826 DT |
1654 | list_add_tail(&handle->h_node, &handler->h_list); |
1655 | ||
1656 | if (handler->start) | |
1657 | handler->start(handle); | |
1658 | ||
1659 | return 0; | |
1660 | } | |
1661 | EXPORT_SYMBOL(input_register_handle); | |
1662 | ||
8006479c DT |
1663 | /** |
1664 | * input_unregister_handle - unregister an input handle | |
1665 | * @handle: handle to unregister | |
1666 | * | |
1667 | * This function removes input handle from device's | |
1668 | * and handler's lists. | |
1669 | * | |
1670 | * This function is supposed to be called from handler's | |
1671 | * disconnect() method. | |
1672 | */ | |
5b2a0826 DT |
1673 | void input_unregister_handle(struct input_handle *handle) |
1674 | { | |
8006479c DT |
1675 | struct input_dev *dev = handle->dev; |
1676 | ||
5b2a0826 | 1677 | list_del_init(&handle->h_node); |
8006479c DT |
1678 | |
1679 | /* | |
1680 | * Take dev->mutex to prevent race with input_release_device(). | |
1681 | */ | |
1682 | mutex_lock(&dev->mutex); | |
1683 | list_del_rcu(&handle->d_node); | |
1684 | mutex_unlock(&dev->mutex); | |
82ba56c2 | 1685 | synchronize_rcu(); |
5b2a0826 DT |
1686 | } |
1687 | EXPORT_SYMBOL(input_unregister_handle); | |
1688 | ||
1da177e4 LT |
1689 | static int input_open_file(struct inode *inode, struct file *file) |
1690 | { | |
2edbf853 | 1691 | struct input_handler *handler; |
99ac48f5 | 1692 | const struct file_operations *old_fops, *new_fops = NULL; |
1da177e4 LT |
1693 | int err; |
1694 | ||
2edbf853 | 1695 | lock_kernel(); |
1da177e4 | 1696 | /* No load-on-demand here? */ |
2edbf853 JC |
1697 | handler = input_table[iminor(inode) >> 5]; |
1698 | if (!handler || !(new_fops = fops_get(handler->fops))) { | |
1699 | err = -ENODEV; | |
1700 | goto out; | |
1701 | } | |
1da177e4 LT |
1702 | |
1703 | /* | |
1704 | * That's _really_ odd. Usually NULL ->open means "nothing special", | |
1705 | * not "no device". Oh, well... | |
1706 | */ | |
1707 | if (!new_fops->open) { | |
1708 | fops_put(new_fops); | |
2edbf853 JC |
1709 | err = -ENODEV; |
1710 | goto out; | |
1da177e4 LT |
1711 | } |
1712 | old_fops = file->f_op; | |
1713 | file->f_op = new_fops; | |
1714 | ||
1715 | err = new_fops->open(inode, file); | |
1716 | ||
1717 | if (err) { | |
1718 | fops_put(file->f_op); | |
1719 | file->f_op = fops_get(old_fops); | |
1720 | } | |
1721 | fops_put(old_fops); | |
2edbf853 JC |
1722 | out: |
1723 | unlock_kernel(); | |
1da177e4 LT |
1724 | return err; |
1725 | } | |
1726 | ||
2b8693c0 | 1727 | static const struct file_operations input_fops = { |
1da177e4 LT |
1728 | .owner = THIS_MODULE, |
1729 | .open = input_open_file, | |
1730 | }; | |
1731 | ||
61994a61 HR |
1732 | static void __init input_init_abs_bypass(void) |
1733 | { | |
1734 | const unsigned int *p; | |
1735 | ||
1736 | for (p = input_abs_bypass_init_data; *p; p++) | |
1737 | input_abs_bypass[BIT_WORD(*p)] |= BIT_MASK(*p); | |
1738 | } | |
1739 | ||
f96b434d | 1740 | static int __init input_init(void) |
1da177e4 | 1741 | { |
f96b434d | 1742 | int err; |
1da177e4 | 1743 | |
61994a61 HR |
1744 | input_init_abs_bypass(); |
1745 | ||
ea9f240b | 1746 | err = class_register(&input_class); |
d19fbe8a DT |
1747 | if (err) { |
1748 | printk(KERN_ERR "input: unable to register input_dev class\n"); | |
1749 | return err; | |
1750 | } | |
1751 | ||
f96b434d DT |
1752 | err = input_proc_init(); |
1753 | if (err) | |
b0fdfebb | 1754 | goto fail1; |
1da177e4 | 1755 | |
f96b434d DT |
1756 | err = register_chrdev(INPUT_MAJOR, "input", &input_fops); |
1757 | if (err) { | |
1758 | printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR); | |
b0fdfebb | 1759 | goto fail2; |
1da177e4 | 1760 | } |
e334016f | 1761 | |
1da177e4 | 1762 | return 0; |
1da177e4 | 1763 | |
b0fdfebb | 1764 | fail2: input_proc_exit(); |
ea9f240b | 1765 | fail1: class_unregister(&input_class); |
f96b434d | 1766 | return err; |
1da177e4 LT |
1767 | } |
1768 | ||
1769 | static void __exit input_exit(void) | |
1770 | { | |
f96b434d | 1771 | input_proc_exit(); |
1da177e4 | 1772 | unregister_chrdev(INPUT_MAJOR, "input"); |
ea9f240b | 1773 | class_unregister(&input_class); |
1da177e4 LT |
1774 | } |
1775 | ||
1776 | subsys_initcall(input_init); | |
1777 | module_exit(input_exit); |