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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Joe Perchesda0c4902010-11-29 23:33:07 -080013#define pr_fmt(fmt) KBUILD_BASENAME ": " fmt
14
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/init.h>
Dmitry Torokhovffd0db92009-09-16 01:06:43 -070016#include <linux/types.h>
Dmitry Torokhov7f8d4ca2012-10-08 09:07:24 -070017#include <linux/idr.h>
Henrik Rydberg47c78e82010-11-27 09:16:48 +010018#include <linux/input/mt.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/module.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090020#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <linux/random.h>
22#include <linux/major.h>
23#include <linux/proc_fs.h>
Alexey Dobriyana99bbaf2009-10-04 16:11:37 +040024#include <linux/sched.h>
Dmitry Torokhov969b21c2006-04-02 00:09:34 -050025#include <linux/seq_file.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <linux/poll.h>
27#include <linux/device.h>
Jes Sorensene676c232006-02-19 00:21:46 -050028#include <linux/mutex.h>
Dmitry Torokhov80064792007-08-30 00:22:11 -040029#include <linux/rcupdate.h>
Dmitry Torokhov15e184a2010-01-11 00:05:43 -080030#include "input-compat.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
32MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
33MODULE_DESCRIPTION("Input core");
34MODULE_LICENSE("GPL");
35
Dmitry Torokhov7f8d4ca2012-10-08 09:07:24 -070036#define INPUT_MAX_CHAR_DEVICES 1024
37#define INPUT_FIRST_DYNAMIC_DEV 256
38static DEFINE_IDA(input_ida);
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
40static LIST_HEAD(input_dev_list);
41static LIST_HEAD(input_handler_list);
42
Dmitry Torokhov80064792007-08-30 00:22:11 -040043/*
44 * input_mutex protects access to both input_dev_list and input_handler_list.
45 * This also causes input_[un]register_device and input_[un]register_handler
46 * be mutually exclusive which simplifies locking in drivers implementing
47 * input handlers.
48 */
49static DEFINE_MUTEX(input_mutex);
50
Henrik Rydberg4369c642012-09-15 15:23:35 +020051static const struct input_value input_value_sync = { EV_SYN, SYN_REPORT, 1 };
52
Dmitry Torokhov80064792007-08-30 00:22:11 -040053static inline int is_event_supported(unsigned int code,
54 unsigned long *bm, unsigned int max)
55{
56 return code <= max && test_bit(code, bm);
57}
58
59static int input_defuzz_abs_event(int value, int old_val, int fuzz)
60{
61 if (fuzz) {
62 if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2)
63 return old_val;
64
65 if (value > old_val - fuzz && value < old_val + fuzz)
66 return (old_val * 3 + value) / 4;
67
68 if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2)
69 return (old_val + value) / 2;
70 }
71
72 return value;
73}
74
Dmitry Torokhov80064792007-08-30 00:22:11 -040075static void input_start_autorepeat(struct input_dev *dev, int code)
76{
77 if (test_bit(EV_REP, dev->evbit) &&
78 dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] &&
79 dev->timer.data) {
80 dev->repeat_key = code;
81 mod_timer(&dev->timer,
82 jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
83 }
84}
85
Johannes Berge7b5c1e2009-01-29 23:17:52 -080086static void input_stop_autorepeat(struct input_dev *dev)
87{
88 del_timer(&dev->timer);
89}
90
Dmitry Torokhov80064792007-08-30 00:22:11 -040091/*
92 * Pass event first through all filters and then, if event has not been
93 * filtered out, through all open handles. This function is called with
94 * dev->event_lock held and interrupts disabled.
95 */
Henrik Rydberg4369c642012-09-15 15:23:35 +020096static unsigned int input_to_handler(struct input_handle *handle,
97 struct input_value *vals, unsigned int count)
Dmitry Torokhov80064792007-08-30 00:22:11 -040098{
Henrik Rydberg4369c642012-09-15 15:23:35 +020099 struct input_handler *handler = handle->handler;
100 struct input_value *end = vals;
101 struct input_value *v;
102
103 for (v = vals; v != vals + count; v++) {
104 if (handler->filter &&
105 handler->filter(handle, v->type, v->code, v->value))
106 continue;
107 if (end != v)
108 *end = *v;
109 end++;
110 }
111
112 count = end - vals;
113 if (!count)
114 return 0;
115
116 if (handler->events)
117 handler->events(handle, vals, count);
118 else if (handler->event)
119 for (v = vals; v != end; v++)
120 handler->event(handle, v->type, v->code, v->value);
121
122 return count;
123}
124
125/*
126 * Pass values first through all filters and then, if event has not been
127 * filtered out, through all open handles. This function is called with
128 * dev->event_lock held and interrupts disabled.
129 */
130static void input_pass_values(struct input_dev *dev,
131 struct input_value *vals, unsigned int count)
132{
Dmitry Torokhov80064792007-08-30 00:22:11 -0400133 struct input_handle *handle;
Henrik Rydberg4369c642012-09-15 15:23:35 +0200134 struct input_value *v;
135
136 if (!count)
137 return;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400138
139 rcu_read_lock();
140
141 handle = rcu_dereference(dev->grab);
Henrik Rydberg4369c642012-09-15 15:23:35 +0200142 if (handle) {
143 count = input_to_handler(handle, vals, count);
144 } else {
145 list_for_each_entry_rcu(handle, &dev->h_list, d_node)
146 if (handle->open)
147 count = input_to_handler(handle, vals, count);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400148 }
149
150 rcu_read_unlock();
Henrik Rydberg352ac4b2012-08-10 21:36:15 +0200151
Henrik Rydberg4369c642012-09-15 15:23:35 +0200152 add_input_randomness(vals->type, vals->code, vals->value);
Henrik Rydberg352ac4b2012-08-10 21:36:15 +0200153
Henrik Rydberg4369c642012-09-15 15:23:35 +0200154 /* trigger auto repeat for key events */
155 for (v = vals; v != vals + count; v++) {
156 if (v->type == EV_KEY && v->value != 2) {
157 if (v->value)
158 input_start_autorepeat(dev, v->code);
159 else
160 input_stop_autorepeat(dev);
161 }
162 }
163}
164
165static void input_pass_event(struct input_dev *dev,
166 unsigned int type, unsigned int code, int value)
167{
168 struct input_value vals[] = { { type, code, value } };
169
170 input_pass_values(dev, vals, ARRAY_SIZE(vals));
Dmitry Torokhov80064792007-08-30 00:22:11 -0400171}
172
173/*
174 * Generate software autorepeat event. Note that we take
175 * dev->event_lock here to avoid racing with input_event
176 * which may cause keys get "stuck".
177 */
178static void input_repeat_key(unsigned long data)
179{
180 struct input_dev *dev = (void *) data;
181 unsigned long flags;
182
183 spin_lock_irqsave(&dev->event_lock, flags);
184
185 if (test_bit(dev->repeat_key, dev->key) &&
186 is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
Henrik Rydberg4369c642012-09-15 15:23:35 +0200187 struct input_value vals[] = {
188 { EV_KEY, dev->repeat_key, 2 },
189 input_value_sync
190 };
Dmitry Torokhov80064792007-08-30 00:22:11 -0400191
Henrik Rydberg4369c642012-09-15 15:23:35 +0200192 input_pass_values(dev, vals, ARRAY_SIZE(vals));
Dmitry Torokhov80064792007-08-30 00:22:11 -0400193
194 if (dev->rep[REP_PERIOD])
195 mod_timer(&dev->timer, jiffies +
196 msecs_to_jiffies(dev->rep[REP_PERIOD]));
197 }
198
199 spin_unlock_irqrestore(&dev->event_lock, flags);
200}
201
Dmitry Torokhov80064792007-08-30 00:22:11 -0400202#define INPUT_IGNORE_EVENT 0
203#define INPUT_PASS_TO_HANDLERS 1
204#define INPUT_PASS_TO_DEVICE 2
Henrik Rydberg4369c642012-09-15 15:23:35 +0200205#define INPUT_SLOT 4
206#define INPUT_FLUSH 8
Dmitry Torokhov80064792007-08-30 00:22:11 -0400207#define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
208
Henrik Rydberg40d007e2010-07-15 23:10:10 -0700209static int input_handle_abs_event(struct input_dev *dev,
210 unsigned int code, int *pval)
211{
Henrik Rydberg8d18fba2012-09-15 15:15:58 +0200212 struct input_mt *mt = dev->mt;
Henrik Rydberg40d007e2010-07-15 23:10:10 -0700213 bool is_mt_event;
214 int *pold;
215
216 if (code == ABS_MT_SLOT) {
217 /*
218 * "Stage" the event; we'll flush it later, when we
Dmitry Torokhov144c0f82010-09-03 10:31:05 -0700219 * get actual touch data.
Henrik Rydberg40d007e2010-07-15 23:10:10 -0700220 */
Henrik Rydberg8d18fba2012-09-15 15:15:58 +0200221 if (mt && *pval >= 0 && *pval < mt->num_slots)
222 mt->slot = *pval;
Henrik Rydberg40d007e2010-07-15 23:10:10 -0700223
224 return INPUT_IGNORE_EVENT;
225 }
226
Henrik Rydbergb89529a2012-01-12 19:40:34 +0100227 is_mt_event = input_is_mt_value(code);
Henrik Rydberg40d007e2010-07-15 23:10:10 -0700228
229 if (!is_mt_event) {
Daniel Mackd31b2862010-08-02 20:18:21 -0700230 pold = &dev->absinfo[code].value;
Henrik Rydberg8d18fba2012-09-15 15:15:58 +0200231 } else if (mt) {
232 pold = &mt->slots[mt->slot].abs[code - ABS_MT_FIRST];
Henrik Rydberg40d007e2010-07-15 23:10:10 -0700233 } else {
234 /*
Dmitry Torokhov144c0f82010-09-03 10:31:05 -0700235 * Bypass filtering for multi-touch events when
Henrik Rydberg40d007e2010-07-15 23:10:10 -0700236 * not employing slots.
237 */
238 pold = NULL;
239 }
240
241 if (pold) {
242 *pval = input_defuzz_abs_event(*pval, *pold,
Daniel Mackd31b2862010-08-02 20:18:21 -0700243 dev->absinfo[code].fuzz);
Henrik Rydberg40d007e2010-07-15 23:10:10 -0700244 if (*pold == *pval)
245 return INPUT_IGNORE_EVENT;
246
247 *pold = *pval;
248 }
249
250 /* Flush pending "slot" event */
Henrik Rydberg8d18fba2012-09-15 15:15:58 +0200251 if (is_mt_event && mt && mt->slot != input_abs_get_val(dev, ABS_MT_SLOT)) {
252 input_abs_set_val(dev, ABS_MT_SLOT, mt->slot);
Henrik Rydberg4369c642012-09-15 15:23:35 +0200253 return INPUT_PASS_TO_HANDLERS | INPUT_SLOT;
Henrik Rydberg40d007e2010-07-15 23:10:10 -0700254 }
255
256 return INPUT_PASS_TO_HANDLERS;
257}
258
Henrik Rydberg4369c642012-09-15 15:23:35 +0200259static int input_get_disposition(struct input_dev *dev,
Dmitry Torokhov50c5d362014-07-19 16:30:31 -0700260 unsigned int type, unsigned int code, int *pval)
Dmitry Torokhov80064792007-08-30 00:22:11 -0400261{
262 int disposition = INPUT_IGNORE_EVENT;
Dmitry Torokhov50c5d362014-07-19 16:30:31 -0700263 int value = *pval;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400264
265 switch (type) {
266
267 case EV_SYN:
268 switch (code) {
269 case SYN_CONFIG:
270 disposition = INPUT_PASS_TO_ALL;
271 break;
272
273 case SYN_REPORT:
Henrik Rydberg4369c642012-09-15 15:23:35 +0200274 disposition = INPUT_PASS_TO_HANDLERS | INPUT_FLUSH;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400275 break;
Henrik Rydberg5e5ee682009-04-28 07:47:33 -0700276 case SYN_MT_REPORT:
Henrik Rydberg5e5ee682009-04-28 07:47:33 -0700277 disposition = INPUT_PASS_TO_HANDLERS;
278 break;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400279 }
280 break;
281
282 case EV_KEY:
Henrik Rydberg06721202012-08-10 21:39:38 +0200283 if (is_event_supported(code, dev->keybit, KEY_MAX)) {
Dmitry Torokhov80064792007-08-30 00:22:11 -0400284
Henrik Rydberg06721202012-08-10 21:39:38 +0200285 /* auto-repeat bypasses state updates */
286 if (value == 2) {
287 disposition = INPUT_PASS_TO_HANDLERS;
288 break;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400289 }
290
Henrik Rydberg06721202012-08-10 21:39:38 +0200291 if (!!test_bit(code, dev->key) != !!value) {
292
Dmitry Torokhov80064792007-08-30 00:22:11 -0400293 __change_bit(code, dev->key);
Henrik Rydberg06721202012-08-10 21:39:38 +0200294 disposition = INPUT_PASS_TO_HANDLERS;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400295 }
Dmitry Torokhov80064792007-08-30 00:22:11 -0400296 }
297 break;
298
299 case EV_SW:
300 if (is_event_supported(code, dev->swbit, SW_MAX) &&
Henrik Rydberg06721202012-08-10 21:39:38 +0200301 !!test_bit(code, dev->sw) != !!value) {
Dmitry Torokhov80064792007-08-30 00:22:11 -0400302
303 __change_bit(code, dev->sw);
304 disposition = INPUT_PASS_TO_HANDLERS;
305 }
306 break;
307
308 case EV_ABS:
Henrik Rydberg40d007e2010-07-15 23:10:10 -0700309 if (is_event_supported(code, dev->absbit, ABS_MAX))
Dmitry Torokhov9ae43452011-02-02 23:04:27 -0800310 disposition = input_handle_abs_event(dev, code, &value);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400311
Dmitry Torokhov80064792007-08-30 00:22:11 -0400312 break;
313
314 case EV_REL:
315 if (is_event_supported(code, dev->relbit, REL_MAX) && value)
316 disposition = INPUT_PASS_TO_HANDLERS;
317
318 break;
319
320 case EV_MSC:
321 if (is_event_supported(code, dev->mscbit, MSC_MAX))
322 disposition = INPUT_PASS_TO_ALL;
323
324 break;
325
326 case EV_LED:
327 if (is_event_supported(code, dev->ledbit, LED_MAX) &&
Henrik Rydberg06721202012-08-10 21:39:38 +0200328 !!test_bit(code, dev->led) != !!value) {
Dmitry Torokhov80064792007-08-30 00:22:11 -0400329
330 __change_bit(code, dev->led);
331 disposition = INPUT_PASS_TO_ALL;
332 }
333 break;
334
335 case EV_SND:
336 if (is_event_supported(code, dev->sndbit, SND_MAX)) {
337
338 if (!!test_bit(code, dev->snd) != !!value)
339 __change_bit(code, dev->snd);
340 disposition = INPUT_PASS_TO_ALL;
341 }
342 break;
343
344 case EV_REP:
345 if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {
346 dev->rep[code] = value;
347 disposition = INPUT_PASS_TO_ALL;
348 }
349 break;
350
351 case EV_FF:
352 if (value >= 0)
353 disposition = INPUT_PASS_TO_ALL;
354 break;
Richard Purdieed2fa4d2008-01-03 10:46:21 -0500355
356 case EV_PWR:
357 disposition = INPUT_PASS_TO_ALL;
358 break;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400359 }
360
Dmitry Torokhov50c5d362014-07-19 16:30:31 -0700361 *pval = value;
Henrik Rydberg4369c642012-09-15 15:23:35 +0200362 return disposition;
363}
364
365static void input_handle_event(struct input_dev *dev,
366 unsigned int type, unsigned int code, int value)
367{
368 int disposition;
369
Dmitry Torokhov50c5d362014-07-19 16:30:31 -0700370 disposition = input_get_disposition(dev, type, code, &value);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400371
372 if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
373 dev->event(dev, type, code, value);
374
Henrik Rydberg4369c642012-09-15 15:23:35 +0200375 if (!dev->vals)
376 return;
377
378 if (disposition & INPUT_PASS_TO_HANDLERS) {
379 struct input_value *v;
380
381 if (disposition & INPUT_SLOT) {
382 v = &dev->vals[dev->num_vals++];
383 v->type = EV_ABS;
384 v->code = ABS_MT_SLOT;
385 v->value = dev->mt->slot;
386 }
387
388 v = &dev->vals[dev->num_vals++];
389 v->type = type;
390 v->code = code;
391 v->value = value;
392 }
393
394 if (disposition & INPUT_FLUSH) {
395 if (dev->num_vals >= 2)
396 input_pass_values(dev, dev->vals, dev->num_vals);
397 dev->num_vals = 0;
398 } else if (dev->num_vals >= dev->max_vals - 2) {
399 dev->vals[dev->num_vals++] = input_value_sync;
400 input_pass_values(dev, dev->vals, dev->num_vals);
401 dev->num_vals = 0;
402 }
403
Dmitry Torokhov80064792007-08-30 00:22:11 -0400404}
405
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400406/**
407 * input_event() - report new input event
Dmitry Torokhov14471902006-11-02 23:26:55 -0500408 * @dev: device that generated the event
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400409 * @type: type of the event
410 * @code: event code
411 * @value: value of the event
412 *
Dmitry Torokhov80064792007-08-30 00:22:11 -0400413 * This function should be used by drivers implementing various input
Dmitry Torokhovdf2d4632009-12-11 21:57:31 -0800414 * devices to report input events. See also input_inject_event().
415 *
416 * NOTE: input_event() may be safely used right after input device was
417 * allocated with input_allocate_device(), even before it is registered
418 * with input_register_device(), but the event will not reach any of the
419 * input handlers. Such early invocation of input_event() may be used
420 * to 'seed' initial state of a switch or initial position of absolute
421 * axis, etc.
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400422 */
Dmitry Torokhov80064792007-08-30 00:22:11 -0400423void input_event(struct input_dev *dev,
424 unsigned int type, unsigned int code, int value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425{
Dmitry Torokhov80064792007-08-30 00:22:11 -0400426 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
Dmitry Torokhov80064792007-08-30 00:22:11 -0400428 if (is_event_supported(type, dev->evbit, EV_MAX)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429
Dmitry Torokhov80064792007-08-30 00:22:11 -0400430 spin_lock_irqsave(&dev->event_lock, flags);
Dmitry Torokhov9ae43452011-02-02 23:04:27 -0800431 input_handle_event(dev, type, code, value);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400432 spin_unlock_irqrestore(&dev->event_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -0400435EXPORT_SYMBOL(input_event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400437/**
438 * input_inject_event() - send input event from input handler
439 * @handle: input handle to send event through
440 * @type: type of the event
441 * @code: event code
442 * @value: value of the event
443 *
Dmitry Torokhov80064792007-08-30 00:22:11 -0400444 * Similar to input_event() but will ignore event if device is
445 * "grabbed" and handle injecting event is not the one that owns
446 * the device.
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400447 */
Dmitry Torokhov80064792007-08-30 00:22:11 -0400448void input_inject_event(struct input_handle *handle,
449 unsigned int type, unsigned int code, int value)
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400450{
Dmitry Torokhov80064792007-08-30 00:22:11 -0400451 struct input_dev *dev = handle->dev;
452 struct input_handle *grab;
453 unsigned long flags;
454
455 if (is_event_supported(type, dev->evbit, EV_MAX)) {
456 spin_lock_irqsave(&dev->event_lock, flags);
457
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400458 rcu_read_lock();
Dmitry Torokhov80064792007-08-30 00:22:11 -0400459 grab = rcu_dereference(dev->grab);
460 if (!grab || grab == handle)
Dmitry Torokhov9ae43452011-02-02 23:04:27 -0800461 input_handle_event(dev, type, code, value);
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400462 rcu_read_unlock();
Dmitry Torokhov80064792007-08-30 00:22:11 -0400463
464 spin_unlock_irqrestore(&dev->event_lock, flags);
465 }
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400466}
467EXPORT_SYMBOL(input_inject_event);
468
Dmitry Torokhov80064792007-08-30 00:22:11 -0400469/**
Daniel Mackd31b2862010-08-02 20:18:21 -0700470 * input_alloc_absinfo - allocates array of input_absinfo structs
471 * @dev: the input device emitting absolute events
472 *
473 * If the absinfo struct the caller asked for is already allocated, this
474 * functions will not do anything.
475 */
476void input_alloc_absinfo(struct input_dev *dev)
477{
478 if (!dev->absinfo)
479 dev->absinfo = kcalloc(ABS_CNT, sizeof(struct input_absinfo),
480 GFP_KERNEL);
481
482 WARN(!dev->absinfo, "%s(): kcalloc() failed?\n", __func__);
483}
484EXPORT_SYMBOL(input_alloc_absinfo);
485
486void input_set_abs_params(struct input_dev *dev, unsigned int axis,
487 int min, int max, int fuzz, int flat)
488{
489 struct input_absinfo *absinfo;
490
491 input_alloc_absinfo(dev);
492 if (!dev->absinfo)
493 return;
494
495 absinfo = &dev->absinfo[axis];
496 absinfo->minimum = min;
497 absinfo->maximum = max;
498 absinfo->fuzz = fuzz;
499 absinfo->flat = flat;
500
Dmitry Torokhov2c9a9cf2014-10-08 09:28:32 -0700501 __set_bit(EV_ABS, dev->evbit);
502 __set_bit(axis, dev->absbit);
Daniel Mackd31b2862010-08-02 20:18:21 -0700503}
504EXPORT_SYMBOL(input_set_abs_params);
505
506
507/**
Dmitry Torokhov80064792007-08-30 00:22:11 -0400508 * input_grab_device - grabs device for exclusive use
509 * @handle: input handle that wants to own the device
510 *
511 * When a device is grabbed by an input handle all events generated by
512 * the device are delivered only to this handle. Also events injected
513 * by other input handles are ignored while device is grabbed.
514 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515int input_grab_device(struct input_handle *handle)
516{
Dmitry Torokhov80064792007-08-30 00:22:11 -0400517 struct input_dev *dev = handle->dev;
518 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519
Dmitry Torokhov80064792007-08-30 00:22:11 -0400520 retval = mutex_lock_interruptible(&dev->mutex);
521 if (retval)
522 return retval;
523
524 if (dev->grab) {
525 retval = -EBUSY;
526 goto out;
527 }
528
529 rcu_assign_pointer(dev->grab, handle);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400530
531 out:
532 mutex_unlock(&dev->mutex);
533 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -0400535EXPORT_SYMBOL(input_grab_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536
Dmitry Torokhov80064792007-08-30 00:22:11 -0400537static void __input_release_device(struct input_handle *handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538{
Andrew Mortona2b2ed22006-07-15 01:17:38 -0400539 struct input_dev *dev = handle->dev;
Dmitry Torokhovadc46332012-10-24 23:53:01 -0700540 struct input_handle *grabber;
Dmitry Torokhovc7e8dc62006-07-06 00:21:03 -0400541
Dmitry Torokhovadc46332012-10-24 23:53:01 -0700542 grabber = rcu_dereference_protected(dev->grab,
543 lockdep_is_held(&dev->mutex));
544 if (grabber == handle) {
Dmitry Torokhov80064792007-08-30 00:22:11 -0400545 rcu_assign_pointer(dev->grab, NULL);
546 /* Make sure input_pass_event() notices that grab is gone */
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400547 synchronize_rcu();
Andrew Mortona2b2ed22006-07-15 01:17:38 -0400548
549 list_for_each_entry(handle, &dev->h_list, d_node)
Dmitry Torokhov80064792007-08-30 00:22:11 -0400550 if (handle->open && handle->handler->start)
Dmitry Torokhovc7e8dc62006-07-06 00:21:03 -0400551 handle->handler->start(handle);
552 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553}
Dmitry Torokhov80064792007-08-30 00:22:11 -0400554
555/**
556 * input_release_device - release previously grabbed device
557 * @handle: input handle that owns the device
558 *
559 * Releases previously grabbed device so that other input handles can
560 * start receiving input events. Upon release all handlers attached
561 * to the device have their start() method called so they have a change
562 * to synchronize device state with the rest of the system.
563 */
564void input_release_device(struct input_handle *handle)
565{
566 struct input_dev *dev = handle->dev;
567
568 mutex_lock(&dev->mutex);
569 __input_release_device(handle);
570 mutex_unlock(&dev->mutex);
571}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -0400572EXPORT_SYMBOL(input_release_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573
Dmitry Torokhov80064792007-08-30 00:22:11 -0400574/**
575 * input_open_device - open input device
576 * @handle: handle through which device is being accessed
577 *
578 * This function should be called by input handlers when they
579 * want to start receive events from given input device.
580 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581int input_open_device(struct input_handle *handle)
582{
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500583 struct input_dev *dev = handle->dev;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400584 int retval;
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500585
Dmitry Torokhov80064792007-08-30 00:22:11 -0400586 retval = mutex_lock_interruptible(&dev->mutex);
587 if (retval)
588 return retval;
589
590 if (dev->going_away) {
591 retval = -ENODEV;
592 goto out;
593 }
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500594
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 handle->open++;
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500596
597 if (!dev->users++ && dev->open)
Dmitry Torokhov80064792007-08-30 00:22:11 -0400598 retval = dev->open(dev);
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500599
Dmitry Torokhov80064792007-08-30 00:22:11 -0400600 if (retval) {
601 dev->users--;
602 if (!--handle->open) {
603 /*
604 * Make sure we are not delivering any more events
605 * through this handle
606 */
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400607 synchronize_rcu();
Dmitry Torokhov80064792007-08-30 00:22:11 -0400608 }
609 }
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500610
Dmitry Torokhov80064792007-08-30 00:22:11 -0400611 out:
Jes Sorensene676c232006-02-19 00:21:46 -0500612 mutex_unlock(&dev->mutex);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400613 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -0400615EXPORT_SYMBOL(input_open_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616
Dmitry Torokhov80064792007-08-30 00:22:11 -0400617int input_flush_device(struct input_handle *handle, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618{
Dmitry Torokhov80064792007-08-30 00:22:11 -0400619 struct input_dev *dev = handle->dev;
620 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621
Dmitry Torokhov80064792007-08-30 00:22:11 -0400622 retval = mutex_lock_interruptible(&dev->mutex);
623 if (retval)
624 return retval;
625
626 if (dev->flush)
627 retval = dev->flush(dev, file);
628
629 mutex_unlock(&dev->mutex);
630 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -0400632EXPORT_SYMBOL(input_flush_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633
Dmitry Torokhov80064792007-08-30 00:22:11 -0400634/**
635 * input_close_device - close input device
636 * @handle: handle through which device is being accessed
637 *
638 * This function should be called by input handlers when they
639 * want to stop receive events from given input device.
640 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641void input_close_device(struct input_handle *handle)
642{
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500643 struct input_dev *dev = handle->dev;
644
Jes Sorensene676c232006-02-19 00:21:46 -0500645 mutex_lock(&dev->mutex);
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500646
Dmitry Torokhov80064792007-08-30 00:22:11 -0400647 __input_release_device(handle);
648
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500649 if (!--dev->users && dev->close)
650 dev->close(dev);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400651
652 if (!--handle->open) {
653 /*
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400654 * synchronize_rcu() makes sure that input_pass_event()
Dmitry Torokhov80064792007-08-30 00:22:11 -0400655 * completed and that no more input events are delivered
656 * through this handle
657 */
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400658 synchronize_rcu();
Dmitry Torokhov80064792007-08-30 00:22:11 -0400659 }
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500660
Jes Sorensene676c232006-02-19 00:21:46 -0500661 mutex_unlock(&dev->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -0400663EXPORT_SYMBOL(input_close_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664
Dmitry Torokhov80064792007-08-30 00:22:11 -0400665/*
Oliver Neukum866d7d72010-07-01 09:01:50 -0700666 * Simulate keyup events for all keys that are marked as pressed.
667 * The function must be called with dev->event_lock held.
668 */
669static void input_dev_release_keys(struct input_dev *dev)
670{
671 int code;
672
673 if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
674 for (code = 0; code <= KEY_MAX; code++) {
675 if (is_event_supported(code, dev->keybit, KEY_MAX) &&
676 __test_and_clear_bit(code, dev->key)) {
Dmitry Torokhov9ae43452011-02-02 23:04:27 -0800677 input_pass_event(dev, EV_KEY, code, 0);
Oliver Neukum866d7d72010-07-01 09:01:50 -0700678 }
679 }
Dmitry Torokhov9ae43452011-02-02 23:04:27 -0800680 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
Oliver Neukum866d7d72010-07-01 09:01:50 -0700681 }
682}
683
684/*
Dmitry Torokhov80064792007-08-30 00:22:11 -0400685 * Prepare device for unregistering
686 */
687static void input_disconnect_device(struct input_dev *dev)
688{
689 struct input_handle *handle;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400690
691 /*
692 * Mark device as going away. Note that we take dev->mutex here
693 * not to protect access to dev->going_away but rather to ensure
694 * that there are no threads in the middle of input_open_device()
695 */
696 mutex_lock(&dev->mutex);
Dmitry Torokhovffd0db92009-09-16 01:06:43 -0700697 dev->going_away = true;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400698 mutex_unlock(&dev->mutex);
699
700 spin_lock_irq(&dev->event_lock);
701
702 /*
703 * Simulate keyup events for all pressed keys so that handlers
704 * are not left with "stuck" keys. The driver may continue
705 * generate events even after we done here but they will not
706 * reach any handlers.
707 */
Oliver Neukum866d7d72010-07-01 09:01:50 -0700708 input_dev_release_keys(dev);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400709
710 list_for_each_entry(handle, &dev->h_list, d_node)
711 handle->open = 0;
712
713 spin_unlock_irq(&dev->event_lock);
714}
715
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700716/**
717 * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry
718 * @ke: keymap entry containing scancode to be converted.
719 * @scancode: pointer to the location where converted scancode should
720 * be stored.
721 *
722 * This function is used to convert scancode stored in &struct keymap_entry
723 * into scalar form understood by legacy keymap handling methods. These
724 * methods expect scancodes to be represented as 'unsigned int'.
725 */
726int input_scancode_to_scalar(const struct input_keymap_entry *ke,
727 unsigned int *scancode)
728{
729 switch (ke->len) {
730 case 1:
731 *scancode = *((u8 *)ke->scancode);
732 break;
733
734 case 2:
735 *scancode = *((u16 *)ke->scancode);
736 break;
737
738 case 4:
739 *scancode = *((u32 *)ke->scancode);
740 break;
741
742 default:
743 return -EINVAL;
744 }
745
746 return 0;
747}
748EXPORT_SYMBOL(input_scancode_to_scalar);
749
750/*
751 * Those routines handle the default case where no [gs]etkeycode() is
752 * defined. In this case, an array indexed by the scancode is used.
753 */
754
755static unsigned int input_fetch_keycode(struct input_dev *dev,
756 unsigned int index)
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400757{
758 switch (dev->keycodesize) {
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700759 case 1:
760 return ((u8 *)dev->keycode)[index];
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400761
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700762 case 2:
763 return ((u16 *)dev->keycode)[index];
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400764
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700765 default:
766 return ((u32 *)dev->keycode)[index];
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400767 }
768}
769
770static int input_default_getkeycode(struct input_dev *dev,
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700771 struct input_keymap_entry *ke)
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400772{
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700773 unsigned int index;
774 int error;
775
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400776 if (!dev->keycodesize)
777 return -EINVAL;
778
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700779 if (ke->flags & INPUT_KEYMAP_BY_INDEX)
780 index = ke->index;
781 else {
782 error = input_scancode_to_scalar(ke, &index);
783 if (error)
784 return error;
785 }
786
787 if (index >= dev->keycodemax)
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400788 return -EINVAL;
789
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700790 ke->keycode = input_fetch_keycode(dev, index);
791 ke->index = index;
792 ke->len = sizeof(index);
793 memcpy(ke->scancode, &index, sizeof(index));
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400794
795 return 0;
796}
797
798static int input_default_setkeycode(struct input_dev *dev,
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700799 const struct input_keymap_entry *ke,
800 unsigned int *old_keycode)
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400801{
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700802 unsigned int index;
803 int error;
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400804 int i;
805
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400806 if (!dev->keycodesize)
807 return -EINVAL;
808
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700809 if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
810 index = ke->index;
811 } else {
812 error = input_scancode_to_scalar(ke, &index);
813 if (error)
814 return error;
815 }
816
817 if (index >= dev->keycodemax)
818 return -EINVAL;
819
Mattia Dongilide391d12010-11-18 09:06:43 -0800820 if (dev->keycodesize < sizeof(ke->keycode) &&
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700821 (ke->keycode >> (dev->keycodesize * 8)))
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400822 return -EINVAL;
823
824 switch (dev->keycodesize) {
825 case 1: {
826 u8 *k = (u8 *)dev->keycode;
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700827 *old_keycode = k[index];
828 k[index] = ke->keycode;
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400829 break;
830 }
831 case 2: {
832 u16 *k = (u16 *)dev->keycode;
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700833 *old_keycode = k[index];
834 k[index] = ke->keycode;
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400835 break;
836 }
837 default: {
838 u32 *k = (u32 *)dev->keycode;
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700839 *old_keycode = k[index];
840 k[index] = ke->keycode;
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400841 break;
842 }
843 }
844
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700845 __clear_bit(*old_keycode, dev->keybit);
846 __set_bit(ke->keycode, dev->keybit);
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400847
848 for (i = 0; i < dev->keycodemax; i++) {
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700849 if (input_fetch_keycode(dev, i) == *old_keycode) {
850 __set_bit(*old_keycode, dev->keybit);
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400851 break; /* Setting the bit twice is useless, so break */
852 }
853 }
854
855 return 0;
856}
857
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400858/**
859 * input_get_keycode - retrieve keycode currently mapped to a given scancode
860 * @dev: input device which keymap is being queried
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700861 * @ke: keymap entry
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400862 *
863 * This function should be called by anyone interested in retrieving current
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700864 * keymap. Presently evdev handlers use it.
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400865 */
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700866int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke)
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400867{
Dmitry Torokhov2e2e3b92010-03-21 22:56:15 -0700868 unsigned long flags;
869 int retval;
870
871 spin_lock_irqsave(&dev->event_lock, flags);
Dmitry Torokhovaebd6362011-01-31 21:06:39 -0800872 retval = dev->getkeycode(dev, ke);
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700873 spin_unlock_irqrestore(&dev->event_lock, flags);
Dmitry Torokhovaebd6362011-01-31 21:06:39 -0800874
Dmitry Torokhov2e2e3b92010-03-21 22:56:15 -0700875 return retval;
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400876}
877EXPORT_SYMBOL(input_get_keycode);
878
879/**
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700880 * input_set_keycode - attribute a keycode to a given scancode
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400881 * @dev: input device which keymap is being updated
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700882 * @ke: new keymap entry
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400883 *
884 * This function should be called by anyone needing to update current
885 * keymap. Presently keyboard and evdev handlers use it.
886 */
Dmitry Torokhov58b93992010-03-08 22:37:10 -0800887int input_set_keycode(struct input_dev *dev,
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700888 const struct input_keymap_entry *ke)
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400889{
890 unsigned long flags;
Dmitry Torokhovfd6cf3d2010-07-14 00:25:21 -0700891 unsigned int old_keycode;
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400892 int retval;
893
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700894 if (ke->keycode > KEY_MAX)
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400895 return -EINVAL;
896
897 spin_lock_irqsave(&dev->event_lock, flags);
898
Dmitry Torokhovaebd6362011-01-31 21:06:39 -0800899 retval = dev->setkeycode(dev, ke, &old_keycode);
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400900 if (retval)
901 goto out;
902
Dmitry Torokhov4f93df42010-01-05 17:56:00 -0800903 /* Make sure KEY_RESERVED did not get enabled. */
904 __clear_bit(KEY_RESERVED, dev->keybit);
905
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400906 /*
907 * Simulate keyup event if keycode is not present
908 * in the keymap anymore
909 */
910 if (test_bit(EV_KEY, dev->evbit) &&
911 !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&
912 __test_and_clear_bit(old_keycode, dev->key)) {
Henrik Rydberg4369c642012-09-15 15:23:35 +0200913 struct input_value vals[] = {
914 { EV_KEY, old_keycode, 0 },
915 input_value_sync
916 };
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400917
Henrik Rydberg4369c642012-09-15 15:23:35 +0200918 input_pass_values(dev, vals, ARRAY_SIZE(vals));
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400919 }
920
921 out:
922 spin_unlock_irqrestore(&dev->event_lock, flags);
923
924 return retval;
925}
926EXPORT_SYMBOL(input_set_keycode);
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400927
Dmitry Torokhov0b7024ac2010-02-02 21:08:26 -0800928static const struct input_device_id *input_match_device(struct input_handler *handler,
Dmitry Torokhov66e66112006-09-14 01:31:59 -0400929 struct input_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930{
Dmitry Torokhov0b7024ac2010-02-02 21:08:26 -0800931 const struct input_device_id *id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932
Dmitry Torokhov0b7024ac2010-02-02 21:08:26 -0800933 for (id = handler->id_table; id->flags || id->driver_info; id++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934
935 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
Dmitry Torokhovddc5d342006-04-26 00:14:19 -0400936 if (id->bustype != dev->id.bustype)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937 continue;
938
939 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
Dmitry Torokhovddc5d342006-04-26 00:14:19 -0400940 if (id->vendor != dev->id.vendor)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941 continue;
942
943 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
Dmitry Torokhovddc5d342006-04-26 00:14:19 -0400944 if (id->product != dev->id.product)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 continue;
946
947 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
Dmitry Torokhovddc5d342006-04-26 00:14:19 -0400948 if (id->version != dev->id.version)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949 continue;
950
Dmitry Torokhovc0bb1f92012-07-31 22:08:55 -0700951 if (!bitmap_subset(id->evbit, dev->evbit, EV_MAX))
952 continue;
953
954 if (!bitmap_subset(id->keybit, dev->keybit, KEY_MAX))
955 continue;
956
957 if (!bitmap_subset(id->relbit, dev->relbit, REL_MAX))
958 continue;
959
960 if (!bitmap_subset(id->absbit, dev->absbit, ABS_MAX))
961 continue;
962
963 if (!bitmap_subset(id->mscbit, dev->mscbit, MSC_MAX))
964 continue;
965
966 if (!bitmap_subset(id->ledbit, dev->ledbit, LED_MAX))
967 continue;
968
969 if (!bitmap_subset(id->sndbit, dev->sndbit, SND_MAX))
970 continue;
971
972 if (!bitmap_subset(id->ffbit, dev->ffbit, FF_MAX))
973 continue;
974
975 if (!bitmap_subset(id->swbit, dev->swbit, SW_MAX))
976 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977
Dmitry Torokhov0b7024ac2010-02-02 21:08:26 -0800978 if (!handler->match || handler->match(handler, dev))
979 return id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 }
981
982 return NULL;
983}
984
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400985static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
986{
987 const struct input_device_id *id;
988 int error;
989
Dmitry Torokhov0b7024ac2010-02-02 21:08:26 -0800990 id = input_match_device(handler, dev);
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400991 if (!id)
992 return -ENODEV;
993
994 error = handler->connect(handler, dev, id);
995 if (error && error != -ENODEV)
Joe Perchesda0c4902010-11-29 23:33:07 -0800996 pr_err("failed to attach handler %s to device %s, error: %d\n",
997 handler->name, kobject_name(&dev->dev.kobj), error);
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400998
999 return error;
1000}
1001
Dmitry Torokhov15e184a2010-01-11 00:05:43 -08001002#ifdef CONFIG_COMPAT
1003
1004static int input_bits_to_string(char *buf, int buf_size,
1005 unsigned long bits, bool skip_empty)
1006{
1007 int len = 0;
1008
1009 if (INPUT_COMPAT_TEST) {
1010 u32 dword = bits >> 32;
1011 if (dword || !skip_empty)
1012 len += snprintf(buf, buf_size, "%x ", dword);
1013
1014 dword = bits & 0xffffffffUL;
1015 if (dword || !skip_empty || len)
1016 len += snprintf(buf + len, max(buf_size - len, 0),
1017 "%x", dword);
1018 } else {
1019 if (bits || !skip_empty)
1020 len += snprintf(buf, buf_size, "%lx", bits);
1021 }
1022
1023 return len;
1024}
1025
1026#else /* !CONFIG_COMPAT */
1027
1028static int input_bits_to_string(char *buf, int buf_size,
1029 unsigned long bits, bool skip_empty)
1030{
1031 return bits || !skip_empty ?
1032 snprintf(buf, buf_size, "%lx", bits) : 0;
1033}
1034
1035#endif
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04001036
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037#ifdef CONFIG_PROC_FS
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001038
1039static struct proc_dir_entry *proc_bus_input_dir;
1040static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
1041static int input_devices_state;
1042
1043static inline void input_wakeup_procfs_readers(void)
1044{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045 input_devices_state++;
1046 wake_up(&input_devices_poll_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047}
1048
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001049static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050{
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001051 poll_wait(file, &input_devices_poll_wait, wait);
Dmitry Torokhovfa886612009-03-04 00:52:20 -08001052 if (file->f_version != input_devices_state) {
1053 file->f_version = input_devices_state;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001054 return POLLIN | POLLRDNORM;
Dmitry Torokhovfa886612009-03-04 00:52:20 -08001055 }
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -04001056
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001057 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058}
1059
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001060union input_seq_state {
1061 struct {
1062 unsigned short pos;
1063 bool mutex_acquired;
1064 };
1065 void *p;
1066};
1067
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001068static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
1069{
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001070 union input_seq_state *state = (union input_seq_state *)&seq->private;
1071 int error;
1072
1073 /* We need to fit into seq->private pointer */
1074 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
1075
1076 error = mutex_lock_interruptible(&input_mutex);
1077 if (error) {
1078 state->mutex_acquired = false;
1079 return ERR_PTR(error);
1080 }
1081
1082 state->mutex_acquired = true;
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001083
Pavel Emelianovad5d9722007-07-18 00:38:32 -04001084 return seq_list_start(&input_dev_list, *pos);
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001085}
1086
1087static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1088{
Pavel Emelianovad5d9722007-07-18 00:38:32 -04001089 return seq_list_next(v, &input_dev_list, pos);
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001090}
1091
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001092static void input_seq_stop(struct seq_file *seq, void *v)
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001093{
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001094 union input_seq_state *state = (union input_seq_state *)&seq->private;
1095
1096 if (state->mutex_acquired)
1097 mutex_unlock(&input_mutex);
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001098}
1099
1100static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
1101 unsigned long *bitmap, int max)
1102{
1103 int i;
Dmitry Torokhov15e184a2010-01-11 00:05:43 -08001104 bool skip_empty = true;
1105 char buf[18];
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001106
1107 seq_printf(seq, "B: %s=", name);
Dmitry Torokhov15e184a2010-01-11 00:05:43 -08001108
1109 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1110 if (input_bits_to_string(buf, sizeof(buf),
1111 bitmap[i], skip_empty)) {
1112 skip_empty = false;
1113 seq_printf(seq, "%s%s", buf, i > 0 ? " " : "");
1114 }
1115 }
1116
1117 /*
1118 * If no output was produced print a single 0.
1119 */
1120 if (skip_empty)
1121 seq_puts(seq, "0");
1122
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001123 seq_putc(seq, '\n');
1124}
1125
1126static int input_devices_seq_show(struct seq_file *seq, void *v)
1127{
1128 struct input_dev *dev = container_of(v, struct input_dev, node);
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001129 const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130 struct input_handle *handle;
1131
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001132 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
1133 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001135 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
1136 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
1137 seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
Dmitry Torokhov15e03ae2007-03-07 23:20:17 -05001138 seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001139 seq_printf(seq, "H: Handlers=");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001141 list_for_each_entry(handle, &dev->h_list, d_node)
1142 seq_printf(seq, "%s ", handle->name);
1143 seq_putc(seq, '\n');
Dmitry Torokhov051b2fe2005-09-15 02:01:54 -05001144
Henrik Rydberg85b77202010-12-18 20:51:13 +01001145 input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX);
1146
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001147 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
1148 if (test_bit(EV_KEY, dev->evbit))
1149 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
1150 if (test_bit(EV_REL, dev->evbit))
1151 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
1152 if (test_bit(EV_ABS, dev->evbit))
1153 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
1154 if (test_bit(EV_MSC, dev->evbit))
1155 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
1156 if (test_bit(EV_LED, dev->evbit))
1157 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
1158 if (test_bit(EV_SND, dev->evbit))
1159 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
1160 if (test_bit(EV_FF, dev->evbit))
1161 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
1162 if (test_bit(EV_SW, dev->evbit))
1163 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001165 seq_putc(seq, '\n');
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001167 kfree(path);
1168 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169}
1170
Jan Engelhardtcec69c32008-01-31 00:43:32 -05001171static const struct seq_operations input_devices_seq_ops = {
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001172 .start = input_devices_seq_start,
1173 .next = input_devices_seq_next,
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001174 .stop = input_seq_stop,
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001175 .show = input_devices_seq_show,
1176};
1177
1178static int input_proc_devices_open(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179{
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001180 return seq_open(file, &input_devices_seq_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181}
1182
Arjan van de Ven2b8693c2007-02-12 00:55:32 -08001183static const struct file_operations input_devices_fileops = {
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001184 .owner = THIS_MODULE,
1185 .open = input_proc_devices_open,
1186 .poll = input_proc_devices_poll,
1187 .read = seq_read,
1188 .llseek = seq_lseek,
1189 .release = seq_release,
1190};
1191
1192static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
1193{
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001194 union input_seq_state *state = (union input_seq_state *)&seq->private;
1195 int error;
Dmitry Torokhov80064792007-08-30 00:22:11 -04001196
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001197 /* We need to fit into seq->private pointer */
1198 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
1199
1200 error = mutex_lock_interruptible(&input_mutex);
1201 if (error) {
1202 state->mutex_acquired = false;
1203 return ERR_PTR(error);
1204 }
1205
1206 state->mutex_acquired = true;
1207 state->pos = *pos;
1208
Pavel Emelianovad5d9722007-07-18 00:38:32 -04001209 return seq_list_start(&input_handler_list, *pos);
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001210}
1211
1212static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1213{
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001214 union input_seq_state *state = (union input_seq_state *)&seq->private;
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001215
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001216 state->pos = *pos + 1;
1217 return seq_list_next(v, &input_handler_list, pos);
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001218}
1219
1220static int input_handlers_seq_show(struct seq_file *seq, void *v)
1221{
1222 struct input_handler *handler = container_of(v, struct input_handler, node);
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001223 union input_seq_state *state = (union input_seq_state *)&seq->private;
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001224
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001225 seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name);
Dmitry Torokhovef7995f2010-01-29 23:59:12 -08001226 if (handler->filter)
1227 seq_puts(seq, " (filter)");
Dmitry Torokhov7f8d4ca2012-10-08 09:07:24 -07001228 if (handler->legacy_minors)
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001229 seq_printf(seq, " Minor=%d", handler->minor);
1230 seq_putc(seq, '\n');
1231
1232 return 0;
1233}
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001234
Jan Engelhardtcec69c32008-01-31 00:43:32 -05001235static const struct seq_operations input_handlers_seq_ops = {
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001236 .start = input_handlers_seq_start,
1237 .next = input_handlers_seq_next,
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001238 .stop = input_seq_stop,
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001239 .show = input_handlers_seq_show,
1240};
1241
1242static int input_proc_handlers_open(struct inode *inode, struct file *file)
1243{
1244 return seq_open(file, &input_handlers_seq_ops);
1245}
1246
Arjan van de Ven2b8693c2007-02-12 00:55:32 -08001247static const struct file_operations input_handlers_fileops = {
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001248 .owner = THIS_MODULE,
1249 .open = input_proc_handlers_open,
1250 .read = seq_read,
1251 .llseek = seq_lseek,
1252 .release = seq_release,
1253};
Luke Kosewskie334016fc2005-06-01 02:39:28 -05001254
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255static int __init input_proc_init(void)
1256{
1257 struct proc_dir_entry *entry;
1258
Alexey Dobriyan9c370662008-04-29 01:01:41 -07001259 proc_bus_input_dir = proc_mkdir("bus/input", NULL);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001260 if (!proc_bus_input_dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261 return -ENOMEM;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001262
Denis V. Lunevc7705f32008-04-29 01:02:35 -07001263 entry = proc_create("devices", 0, proc_bus_input_dir,
1264 &input_devices_fileops);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001265 if (!entry)
1266 goto fail1;
1267
Denis V. Lunevc7705f32008-04-29 01:02:35 -07001268 entry = proc_create("handlers", 0, proc_bus_input_dir,
1269 &input_handlers_fileops);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001270 if (!entry)
1271 goto fail2;
1272
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273 return 0;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001274
1275 fail2: remove_proc_entry("devices", proc_bus_input_dir);
Alexey Dobriyan9c370662008-04-29 01:01:41 -07001276 fail1: remove_proc_entry("bus/input", NULL);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001277 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278}
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001279
Andrew Mortonbeffbdc2005-07-01 23:54:30 -05001280static void input_proc_exit(void)
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001281{
1282 remove_proc_entry("devices", proc_bus_input_dir);
1283 remove_proc_entry("handlers", proc_bus_input_dir);
Alexey Dobriyan9c370662008-04-29 01:01:41 -07001284 remove_proc_entry("bus/input", NULL);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001285}
1286
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287#else /* !CONFIG_PROC_FS */
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001288static inline void input_wakeup_procfs_readers(void) { }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289static inline int input_proc_init(void) { return 0; }
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001290static inline void input_proc_exit(void) { }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291#endif
1292
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001293#define INPUT_DEV_STRING_ATTR_SHOW(name) \
1294static ssize_t input_dev_show_##name(struct device *dev, \
1295 struct device_attribute *attr, \
1296 char *buf) \
1297{ \
1298 struct input_dev *input_dev = to_input_dev(dev); \
1299 \
1300 return scnprintf(buf, PAGE_SIZE, "%s\n", \
1301 input_dev->name ? input_dev->name : ""); \
1302} \
1303static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
Dmitry Torokhov5c1e9a62005-09-15 02:01:55 -05001304
1305INPUT_DEV_STRING_ATTR_SHOW(name);
1306INPUT_DEV_STRING_ATTR_SHOW(phys);
1307INPUT_DEV_STRING_ATTR_SHOW(uniq);
1308
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001309static int input_print_modalias_bits(char *buf, int size,
1310 char name, unsigned long *bm,
1311 unsigned int min_bit, unsigned int max_bit)
Rusty Russell1d8f4302005-12-07 21:40:34 +01001312{
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001313 int len = 0, i;
Rusty Russell1d8f4302005-12-07 21:40:34 +01001314
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001315 len += snprintf(buf, max(size, 0), "%c", name);
1316 for (i = min_bit; i < max_bit; i++)
Jiri Slaby7b19ada2007-10-18 23:40:32 -07001317 if (bm[BIT_WORD(i)] & BIT_MASK(i))
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001318 len += snprintf(buf + len, max(size - len, 0), "%X,", i);
Kay Sieversbd37e5a2006-01-05 13:19:55 +01001319 return len;
1320}
1321
Dmitry Torokhov2db66872006-04-02 00:09:26 -05001322static int input_print_modalias(char *buf, int size, struct input_dev *id,
1323 int add_cr)
Kay Sieversbd37e5a2006-01-05 13:19:55 +01001324{
1325 int len;
1326
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001327 len = snprintf(buf, max(size, 0),
1328 "input:b%04Xv%04Xp%04Xe%04X-",
1329 id->id.bustype, id->id.vendor,
1330 id->id.product, id->id.version);
Kay Sieversbd37e5a2006-01-05 13:19:55 +01001331
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001332 len += input_print_modalias_bits(buf + len, size - len,
1333 'e', id->evbit, 0, EV_MAX);
1334 len += input_print_modalias_bits(buf + len, size - len,
1335 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
1336 len += input_print_modalias_bits(buf + len, size - len,
1337 'r', id->relbit, 0, REL_MAX);
1338 len += input_print_modalias_bits(buf + len, size - len,
1339 'a', id->absbit, 0, ABS_MAX);
1340 len += input_print_modalias_bits(buf + len, size - len,
1341 'm', id->mscbit, 0, MSC_MAX);
1342 len += input_print_modalias_bits(buf + len, size - len,
1343 'l', id->ledbit, 0, LED_MAX);
1344 len += input_print_modalias_bits(buf + len, size - len,
1345 's', id->sndbit, 0, SND_MAX);
1346 len += input_print_modalias_bits(buf + len, size - len,
1347 'f', id->ffbit, 0, FF_MAX);
1348 len += input_print_modalias_bits(buf + len, size - len,
1349 'w', id->swbit, 0, SW_MAX);
Dmitry Torokhov2db66872006-04-02 00:09:26 -05001350
1351 if (add_cr)
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001352 len += snprintf(buf + len, max(size - len, 0), "\n");
Dmitry Torokhov2db66872006-04-02 00:09:26 -05001353
Rusty Russell1d8f4302005-12-07 21:40:34 +01001354 return len;
1355}
1356
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001357static ssize_t input_dev_show_modalias(struct device *dev,
1358 struct device_attribute *attr,
1359 char *buf)
Rusty Russell1d8f4302005-12-07 21:40:34 +01001360{
1361 struct input_dev *id = to_input_dev(dev);
Kay Sieversbd37e5a2006-01-05 13:19:55 +01001362 ssize_t len;
Rusty Russell1d8f4302005-12-07 21:40:34 +01001363
Dmitry Torokhov2db66872006-04-02 00:09:26 -05001364 len = input_print_modalias(buf, PAGE_SIZE, id, 1);
1365
Richard Purdie8a3cf452006-06-26 01:48:21 -04001366 return min_t(int, len, PAGE_SIZE);
Rusty Russell1d8f4302005-12-07 21:40:34 +01001367}
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001368static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
Rusty Russell1d8f4302005-12-07 21:40:34 +01001369
Henrik Rydberg85b77202010-12-18 20:51:13 +01001370static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1371 int max, int add_cr);
1372
1373static ssize_t input_dev_show_properties(struct device *dev,
1374 struct device_attribute *attr,
1375 char *buf)
1376{
1377 struct input_dev *input_dev = to_input_dev(dev);
1378 int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit,
1379 INPUT_PROP_MAX, true);
1380 return min_t(int, len, PAGE_SIZE);
1381}
1382static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL);
1383
Greg Kroah-Hartman629b77a2005-10-27 22:25:43 -07001384static struct attribute *input_dev_attrs[] = {
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001385 &dev_attr_name.attr,
1386 &dev_attr_phys.attr,
1387 &dev_attr_uniq.attr,
1388 &dev_attr_modalias.attr,
Henrik Rydberg85b77202010-12-18 20:51:13 +01001389 &dev_attr_properties.attr,
Greg Kroah-Hartman629b77a2005-10-27 22:25:43 -07001390 NULL
1391};
1392
Dmitry Torokhovbd0ef232005-11-20 00:56:31 -05001393static struct attribute_group input_dev_attr_group = {
Greg Kroah-Hartman629b77a2005-10-27 22:25:43 -07001394 .attrs = input_dev_attrs,
Dmitry Torokhov5c1e9a62005-09-15 02:01:55 -05001395};
1396
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001397#define INPUT_DEV_ID_ATTR(name) \
1398static ssize_t input_dev_show_id_##name(struct device *dev, \
1399 struct device_attribute *attr, \
1400 char *buf) \
1401{ \
1402 struct input_dev *input_dev = to_input_dev(dev); \
1403 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
1404} \
1405static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
Dmitry Torokhov5c1e9a62005-09-15 02:01:55 -05001406
1407INPUT_DEV_ID_ATTR(bustype);
1408INPUT_DEV_ID_ATTR(vendor);
1409INPUT_DEV_ID_ATTR(product);
1410INPUT_DEV_ID_ATTR(version);
1411
1412static struct attribute *input_dev_id_attrs[] = {
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001413 &dev_attr_bustype.attr,
1414 &dev_attr_vendor.attr,
1415 &dev_attr_product.attr,
1416 &dev_attr_version.attr,
Dmitry Torokhov5c1e9a62005-09-15 02:01:55 -05001417 NULL
1418};
1419
1420static struct attribute_group input_dev_id_attr_group = {
1421 .name = "id",
1422 .attrs = input_dev_id_attrs,
1423};
1424
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001425static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1426 int max, int add_cr)
1427{
1428 int i;
1429 int len = 0;
Dmitry Torokhov15e184a2010-01-11 00:05:43 -08001430 bool skip_empty = true;
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001431
Dmitry Torokhov15e184a2010-01-11 00:05:43 -08001432 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1433 len += input_bits_to_string(buf + len, max(buf_size - len, 0),
1434 bitmap[i], skip_empty);
1435 if (len) {
1436 skip_empty = false;
1437 if (i > 0)
1438 len += snprintf(buf + len, max(buf_size - len, 0), " ");
1439 }
1440 }
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001441
Dmitry Torokhov15e184a2010-01-11 00:05:43 -08001442 /*
1443 * If no output was produced print a single 0.
1444 */
1445 if (len == 0)
1446 len = snprintf(buf, buf_size, "%d", 0);
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001447
1448 if (add_cr)
1449 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
1450
1451 return len;
1452}
1453
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001454#define INPUT_DEV_CAP_ATTR(ev, bm) \
1455static ssize_t input_dev_show_cap_##bm(struct device *dev, \
1456 struct device_attribute *attr, \
1457 char *buf) \
1458{ \
1459 struct input_dev *input_dev = to_input_dev(dev); \
1460 int len = input_print_bitmap(buf, PAGE_SIZE, \
Dmitry Torokhov15e184a2010-01-11 00:05:43 -08001461 input_dev->bm##bit, ev##_MAX, \
1462 true); \
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001463 return min_t(int, len, PAGE_SIZE); \
1464} \
1465static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
Dmitry Torokhov5c1e9a62005-09-15 02:01:55 -05001466
1467INPUT_DEV_CAP_ATTR(EV, ev);
1468INPUT_DEV_CAP_ATTR(KEY, key);
1469INPUT_DEV_CAP_ATTR(REL, rel);
1470INPUT_DEV_CAP_ATTR(ABS, abs);
1471INPUT_DEV_CAP_ATTR(MSC, msc);
1472INPUT_DEV_CAP_ATTR(LED, led);
1473INPUT_DEV_CAP_ATTR(SND, snd);
1474INPUT_DEV_CAP_ATTR(FF, ff);
1475INPUT_DEV_CAP_ATTR(SW, sw);
1476
1477static struct attribute *input_dev_caps_attrs[] = {
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001478 &dev_attr_ev.attr,
1479 &dev_attr_key.attr,
1480 &dev_attr_rel.attr,
1481 &dev_attr_abs.attr,
1482 &dev_attr_msc.attr,
1483 &dev_attr_led.attr,
1484 &dev_attr_snd.attr,
1485 &dev_attr_ff.attr,
1486 &dev_attr_sw.attr,
Dmitry Torokhov5c1e9a62005-09-15 02:01:55 -05001487 NULL
1488};
1489
1490static struct attribute_group input_dev_caps_attr_group = {
1491 .name = "capabilities",
1492 .attrs = input_dev_caps_attrs,
1493};
1494
David Brownella4dbd672009-06-24 10:06:31 -07001495static const struct attribute_group *input_dev_attr_groups[] = {
Dmitry Torokhovcb9def42007-03-07 23:20:26 -05001496 &input_dev_attr_group,
1497 &input_dev_id_attr_group,
1498 &input_dev_caps_attr_group,
1499 NULL
1500};
1501
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001502static void input_dev_release(struct device *device)
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001503{
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001504 struct input_dev *dev = to_input_dev(device);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001505
Anssi Hannula509ca1a2006-07-19 01:40:22 -04001506 input_ff_destroy(dev);
Henrik Rydberg40d007e2010-07-15 23:10:10 -07001507 input_mt_destroy_slots(dev);
Daniel Mackd31b2862010-08-02 20:18:21 -07001508 kfree(dev->absinfo);
Henrik Rydberg4369c642012-09-15 15:23:35 +02001509 kfree(dev->vals);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001510 kfree(dev);
Anssi Hannula509ca1a2006-07-19 01:40:22 -04001511
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001512 module_put(THIS_MODULE);
1513}
1514
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001515/*
Kay Sievers312c0042005-11-16 09:00:00 +01001516 * Input uevent interface - loading event handlers based on
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001517 * device bitfields.
1518 */
Kay Sievers7eff2e72007-08-14 15:15:12 +02001519static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001520 const char *name, unsigned long *bitmap, int max)
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001521{
Kay Sievers7eff2e72007-08-14 15:15:12 +02001522 int len;
1523
Henrik Rydbergfcd30272010-12-18 20:28:26 +01001524 if (add_uevent_var(env, "%s", name))
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001525 return -ENOMEM;
1526
Kay Sievers7eff2e72007-08-14 15:15:12 +02001527 len = input_print_bitmap(&env->buf[env->buflen - 1],
1528 sizeof(env->buf) - env->buflen,
Dmitry Torokhov15e184a2010-01-11 00:05:43 -08001529 bitmap, max, false);
Kay Sievers7eff2e72007-08-14 15:15:12 +02001530 if (len >= (sizeof(env->buf) - env->buflen))
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001531 return -ENOMEM;
1532
Kay Sievers7eff2e72007-08-14 15:15:12 +02001533 env->buflen += len;
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001534 return 0;
1535}
1536
Kay Sievers7eff2e72007-08-14 15:15:12 +02001537static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001538 struct input_dev *dev)
1539{
Kay Sievers7eff2e72007-08-14 15:15:12 +02001540 int len;
1541
1542 if (add_uevent_var(env, "MODALIAS="))
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001543 return -ENOMEM;
1544
Kay Sievers7eff2e72007-08-14 15:15:12 +02001545 len = input_print_modalias(&env->buf[env->buflen - 1],
1546 sizeof(env->buf) - env->buflen,
1547 dev, 0);
1548 if (len >= (sizeof(env->buf) - env->buflen))
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001549 return -ENOMEM;
1550
Kay Sievers7eff2e72007-08-14 15:15:12 +02001551 env->buflen += len;
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001552 return 0;
1553}
1554
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001555#define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
1556 do { \
Kay Sievers7eff2e72007-08-14 15:15:12 +02001557 int err = add_uevent_var(env, fmt, val); \
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001558 if (err) \
1559 return err; \
1560 } while (0)
1561
1562#define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
1563 do { \
Kay Sievers7eff2e72007-08-14 15:15:12 +02001564 int err = input_add_uevent_bm_var(env, name, bm, max); \
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001565 if (err) \
1566 return err; \
1567 } while (0)
1568
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001569#define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
1570 do { \
Kay Sievers7eff2e72007-08-14 15:15:12 +02001571 int err = input_add_uevent_modalias_var(env, dev); \
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001572 if (err) \
1573 return err; \
1574 } while (0)
1575
Kay Sievers7eff2e72007-08-14 15:15:12 +02001576static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001577{
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001578 struct input_dev *dev = to_input_dev(device);
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001579
1580 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
1581 dev->id.bustype, dev->id.vendor,
1582 dev->id.product, dev->id.version);
1583 if (dev->name)
1584 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
1585 if (dev->phys)
1586 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
Dmitry Torokhov08de1f02005-11-08 21:34:29 -08001587 if (dev->uniq)
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001588 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
1589
Henrik Rydberg85b77202010-12-18 20:51:13 +01001590 INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX);
1591
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001592 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
1593 if (test_bit(EV_KEY, dev->evbit))
1594 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
1595 if (test_bit(EV_REL, dev->evbit))
1596 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
1597 if (test_bit(EV_ABS, dev->evbit))
1598 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
1599 if (test_bit(EV_MSC, dev->evbit))
1600 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
1601 if (test_bit(EV_LED, dev->evbit))
1602 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
1603 if (test_bit(EV_SND, dev->evbit))
1604 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
1605 if (test_bit(EV_FF, dev->evbit))
1606 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
1607 if (test_bit(EV_SW, dev->evbit))
1608 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
1609
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001610 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001611
1612 return 0;
1613}
1614
Dmitry Torokhov3cc96352009-11-12 23:19:05 -08001615#define INPUT_DO_TOGGLE(dev, type, bits, on) \
1616 do { \
1617 int i; \
1618 bool active; \
1619 \
1620 if (!test_bit(EV_##type, dev->evbit)) \
1621 break; \
1622 \
1623 for (i = 0; i < type##_MAX; i++) { \
1624 if (!test_bit(i, dev->bits##bit)) \
1625 continue; \
1626 \
1627 active = test_bit(i, dev->bits); \
1628 if (!active && !on) \
1629 continue; \
1630 \
1631 dev->event(dev, EV_##type, i, on ? active : 0); \
1632 } \
Dmitry Torokhovffd0db92009-09-16 01:06:43 -07001633 } while (0)
1634
Dmitry Torokhovb50b5212010-11-03 11:02:31 -07001635static void input_dev_toggle(struct input_dev *dev, bool activate)
Dmitry Torokhovffd0db92009-09-16 01:06:43 -07001636{
1637 if (!dev->event)
1638 return;
1639
1640 INPUT_DO_TOGGLE(dev, LED, led, activate);
1641 INPUT_DO_TOGGLE(dev, SND, snd, activate);
1642
1643 if (activate && test_bit(EV_REP, dev->evbit)) {
1644 dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]);
1645 dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]);
1646 }
1647}
1648
Dmitry Torokhovb50b5212010-11-03 11:02:31 -07001649/**
1650 * input_reset_device() - reset/restore the state of input device
1651 * @dev: input device whose state needs to be reset
1652 *
1653 * This function tries to reset the state of an opened input device and
1654 * bring internal state and state if the hardware in sync with each other.
1655 * We mark all keys as released, restore LED state, repeat rate, etc.
1656 */
1657void input_reset_device(struct input_dev *dev)
1658{
Aleksej Makarov768d9aa2013-11-23 10:20:36 -08001659 unsigned long flags;
1660
Dmitry Torokhovb50b5212010-11-03 11:02:31 -07001661 mutex_lock(&dev->mutex);
Aleksej Makarov768d9aa2013-11-23 10:20:36 -08001662 spin_lock_irqsave(&dev->event_lock, flags);
Dmitry Torokhovb50b5212010-11-03 11:02:31 -07001663
Aleksej Makarov768d9aa2013-11-23 10:20:36 -08001664 input_dev_toggle(dev, true);
1665 input_dev_release_keys(dev);
Dmitry Torokhovb50b5212010-11-03 11:02:31 -07001666
Aleksej Makarov768d9aa2013-11-23 10:20:36 -08001667 spin_unlock_irqrestore(&dev->event_lock, flags);
Dmitry Torokhovb50b5212010-11-03 11:02:31 -07001668 mutex_unlock(&dev->mutex);
1669}
1670EXPORT_SYMBOL(input_reset_device);
1671
Aleksej Makarov768d9aa2013-11-23 10:20:36 -08001672#ifdef CONFIG_PM_SLEEP
Dmitry Torokhovffd0db92009-09-16 01:06:43 -07001673static int input_dev_suspend(struct device *dev)
1674{
1675 struct input_dev *input_dev = to_input_dev(dev);
1676
Aleksej Makarov768d9aa2013-11-23 10:20:36 -08001677 spin_lock_irq(&input_dev->event_lock);
Dmitry Torokhovb50b5212010-11-03 11:02:31 -07001678
Aleksej Makarov768d9aa2013-11-23 10:20:36 -08001679 /*
1680 * Keys that are pressed now are unlikely to be
1681 * still pressed when we resume.
1682 */
1683 input_dev_release_keys(input_dev);
Dmitry Torokhovb50b5212010-11-03 11:02:31 -07001684
Aleksej Makarov768d9aa2013-11-23 10:20:36 -08001685 /* Turn off LEDs and sounds, if any are active. */
1686 input_dev_toggle(input_dev, false);
1687
1688 spin_unlock_irq(&input_dev->event_lock);
Dmitry Torokhovffd0db92009-09-16 01:06:43 -07001689
1690 return 0;
1691}
1692
1693static int input_dev_resume(struct device *dev)
1694{
1695 struct input_dev *input_dev = to_input_dev(dev);
1696
Aleksej Makarov768d9aa2013-11-23 10:20:36 -08001697 spin_lock_irq(&input_dev->event_lock);
1698
1699 /* Restore state of LEDs and sounds, if any were active. */
1700 input_dev_toggle(input_dev, true);
1701
1702 spin_unlock_irq(&input_dev->event_lock);
1703
1704 return 0;
1705}
1706
1707static int input_dev_freeze(struct device *dev)
1708{
1709 struct input_dev *input_dev = to_input_dev(dev);
1710
1711 spin_lock_irq(&input_dev->event_lock);
1712
1713 /*
1714 * Keys that are pressed now are unlikely to be
1715 * still pressed when we resume.
1716 */
1717 input_dev_release_keys(input_dev);
1718
1719 spin_unlock_irq(&input_dev->event_lock);
1720
1721 return 0;
1722}
1723
1724static int input_dev_poweroff(struct device *dev)
1725{
1726 struct input_dev *input_dev = to_input_dev(dev);
1727
1728 spin_lock_irq(&input_dev->event_lock);
1729
1730 /* Turn off LEDs and sounds, if any are active. */
1731 input_dev_toggle(input_dev, false);
1732
1733 spin_unlock_irq(&input_dev->event_lock);
Dmitry Torokhovffd0db92009-09-16 01:06:43 -07001734
1735 return 0;
1736}
1737
1738static const struct dev_pm_ops input_dev_pm_ops = {
1739 .suspend = input_dev_suspend,
1740 .resume = input_dev_resume,
Aleksej Makarov768d9aa2013-11-23 10:20:36 -08001741 .freeze = input_dev_freeze,
1742 .poweroff = input_dev_poweroff,
Dmitry Torokhovffd0db92009-09-16 01:06:43 -07001743 .restore = input_dev_resume,
1744};
1745#endif /* CONFIG_PM */
1746
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001747static struct device_type input_dev_type = {
1748 .groups = input_dev_attr_groups,
1749 .release = input_dev_release,
1750 .uevent = input_dev_uevent,
Aleksej Makarov768d9aa2013-11-23 10:20:36 -08001751#ifdef CONFIG_PM_SLEEP
Dmitry Torokhovffd0db92009-09-16 01:06:43 -07001752 .pm = &input_dev_pm_ops,
1753#endif
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001754};
1755
Al Viro2c9ede52011-07-23 20:24:48 -04001756static char *input_devnode(struct device *dev, umode_t *mode)
Kay Sieversaa5ed632009-04-30 15:23:42 +02001757{
1758 return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev));
1759}
1760
Greg Kroah-Hartmanea9f2402005-10-27 22:25:43 -07001761struct class input_class = {
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001762 .name = "input",
Kay Sieverse454cea2009-09-18 23:01:12 +02001763 .devnode = input_devnode,
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001764};
Dmitry Torokhovca56fe02006-06-26 01:49:21 -04001765EXPORT_SYMBOL_GPL(input_class);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001766
Dmitry Torokhov14471902006-11-02 23:26:55 -05001767/**
1768 * input_allocate_device - allocate memory for new input device
1769 *
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07001770 * Returns prepared struct input_dev or %NULL.
Dmitry Torokhov14471902006-11-02 23:26:55 -05001771 *
1772 * NOTE: Use input_free_device() to free devices that have not been
1773 * registered; input_unregister_device() should be used for already
1774 * registered devices.
1775 */
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001776struct input_dev *input_allocate_device(void)
1777{
David Herrmanna60a71b2013-10-06 01:15:08 -07001778 static atomic_t input_no = ATOMIC_INIT(0);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001779 struct input_dev *dev;
1780
1781 dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
1782 if (dev) {
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001783 dev->dev.type = &input_dev_type;
1784 dev->dev.class = &input_class;
1785 device_initialize(&dev->dev);
Dmitry Torokhovf60d2b12006-06-26 01:48:36 -04001786 mutex_init(&dev->mutex);
Dmitry Torokhov80064792007-08-30 00:22:11 -04001787 spin_lock_init(&dev->event_lock);
David Herrmanna60a71b2013-10-06 01:15:08 -07001788 init_timer(&dev->timer);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001789 INIT_LIST_HEAD(&dev->h_list);
1790 INIT_LIST_HEAD(&dev->node);
Dmitry Torokhov655816e2006-09-14 01:32:14 -04001791
Richard Leitnerbf1d50f2014-10-08 14:24:15 -07001792 dev_set_name(&dev->dev, "input%lu",
David Herrmanna60a71b2013-10-06 01:15:08 -07001793 (unsigned long) atomic_inc_return(&input_no) - 1);
1794
Dmitry Torokhov655816e2006-09-14 01:32:14 -04001795 __module_get(THIS_MODULE);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001796 }
1797
1798 return dev;
1799}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -04001800EXPORT_SYMBOL(input_allocate_device);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001801
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07001802struct input_devres {
1803 struct input_dev *input;
1804};
1805
1806static int devm_input_device_match(struct device *dev, void *res, void *data)
1807{
1808 struct input_devres *devres = res;
1809
1810 return devres->input == data;
1811}
1812
1813static void devm_input_device_release(struct device *dev, void *res)
1814{
1815 struct input_devres *devres = res;
1816 struct input_dev *input = devres->input;
1817
1818 dev_dbg(dev, "%s: dropping reference to %s\n",
1819 __func__, dev_name(&input->dev));
1820 input_put_device(input);
1821}
1822
1823/**
1824 * devm_input_allocate_device - allocate managed input device
1825 * @dev: device owning the input device being created
1826 *
1827 * Returns prepared struct input_dev or %NULL.
1828 *
1829 * Managed input devices do not need to be explicitly unregistered or
1830 * freed as it will be done automatically when owner device unbinds from
1831 * its driver (or binding fails). Once managed input device is allocated,
1832 * it is ready to be set up and registered in the same fashion as regular
1833 * input device. There are no special devm_input_device_[un]register()
Dmitry Torokhovb6662632013-01-08 09:10:31 -08001834 * variants, regular ones work with both managed and unmanaged devices,
1835 * should you need them. In most cases however, managed input device need
1836 * not be explicitly unregistered or freed.
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07001837 *
1838 * NOTE: the owner device is set up as parent of input device and users
1839 * should not override it.
1840 */
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07001841struct input_dev *devm_input_allocate_device(struct device *dev)
1842{
1843 struct input_dev *input;
1844 struct input_devres *devres;
1845
1846 devres = devres_alloc(devm_input_device_release,
1847 sizeof(struct input_devres), GFP_KERNEL);
1848 if (!devres)
1849 return NULL;
1850
1851 input = input_allocate_device();
1852 if (!input) {
1853 devres_free(devres);
1854 return NULL;
1855 }
1856
1857 input->dev.parent = dev;
1858 input->devres_managed = true;
1859
1860 devres->input = input;
1861 devres_add(dev, devres);
1862
1863 return input;
1864}
1865EXPORT_SYMBOL(devm_input_allocate_device);
1866
Dmitry Torokhov14471902006-11-02 23:26:55 -05001867/**
1868 * input_free_device - free memory occupied by input_dev structure
1869 * @dev: input device to free
1870 *
1871 * This function should only be used if input_register_device()
1872 * was not called yet or if it failed. Once device was registered
1873 * use input_unregister_device() and memory will be freed once last
Dmitry Torokhov80064792007-08-30 00:22:11 -04001874 * reference to the device is dropped.
Dmitry Torokhov14471902006-11-02 23:26:55 -05001875 *
1876 * Device should be allocated by input_allocate_device().
1877 *
1878 * NOTE: If there are references to the input device then memory
1879 * will not be freed until last reference is dropped.
1880 */
Dmitry Torokhovf60d2b12006-06-26 01:48:36 -04001881void input_free_device(struct input_dev *dev)
1882{
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07001883 if (dev) {
1884 if (dev->devres_managed)
1885 WARN_ON(devres_destroy(dev->dev.parent,
1886 devm_input_device_release,
1887 devm_input_device_match,
1888 dev));
Dmitry Torokhovf60d2b12006-06-26 01:48:36 -04001889 input_put_device(dev);
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07001890 }
Dmitry Torokhovf60d2b12006-06-26 01:48:36 -04001891}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -04001892EXPORT_SYMBOL(input_free_device);
Dmitry Torokhovf60d2b12006-06-26 01:48:36 -04001893
Dmitry Torokhov534565f2007-04-25 00:53:18 -04001894/**
1895 * input_set_capability - mark device as capable of a certain event
1896 * @dev: device that is capable of emitting or accepting event
1897 * @type: type of the event (EV_KEY, EV_REL, etc...)
1898 * @code: event code
1899 *
1900 * In addition to setting up corresponding bit in appropriate capability
1901 * bitmap the function also adjusts dev->evbit.
1902 */
1903void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
1904{
1905 switch (type) {
1906 case EV_KEY:
1907 __set_bit(code, dev->keybit);
1908 break;
1909
1910 case EV_REL:
1911 __set_bit(code, dev->relbit);
1912 break;
1913
1914 case EV_ABS:
Dmitry Torokhov28a2a2e2013-12-26 17:44:29 -08001915 input_alloc_absinfo(dev);
1916 if (!dev->absinfo)
1917 return;
1918
Dmitry Torokhov534565f2007-04-25 00:53:18 -04001919 __set_bit(code, dev->absbit);
1920 break;
1921
1922 case EV_MSC:
1923 __set_bit(code, dev->mscbit);
1924 break;
1925
1926 case EV_SW:
1927 __set_bit(code, dev->swbit);
1928 break;
1929
1930 case EV_LED:
1931 __set_bit(code, dev->ledbit);
1932 break;
1933
1934 case EV_SND:
1935 __set_bit(code, dev->sndbit);
1936 break;
1937
1938 case EV_FF:
1939 __set_bit(code, dev->ffbit);
1940 break;
1941
Dmitry Baryshkov22d1c392007-12-14 01:21:03 -05001942 case EV_PWR:
1943 /* do nothing */
1944 break;
1945
Dmitry Torokhov534565f2007-04-25 00:53:18 -04001946 default:
Joe Perchesda0c4902010-11-29 23:33:07 -08001947 pr_err("input_set_capability: unknown type %u (code %u)\n",
1948 type, code);
Dmitry Torokhov534565f2007-04-25 00:53:18 -04001949 dump_stack();
1950 return;
1951 }
1952
1953 __set_bit(type, dev->evbit);
1954}
1955EXPORT_SYMBOL(input_set_capability);
1956
Jeff Brown80b48952011-04-18 10:08:02 -07001957static unsigned int input_estimate_events_per_packet(struct input_dev *dev)
1958{
1959 int mt_slots;
1960 int i;
1961 unsigned int events;
1962
Henrik Rydberg8d18fba2012-09-15 15:15:58 +02001963 if (dev->mt) {
1964 mt_slots = dev->mt->num_slots;
Jeff Brown80b48952011-04-18 10:08:02 -07001965 } else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit)) {
1966 mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum -
1967 dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1,
Hans Petter Selasky8c127f02011-05-25 09:24:32 -07001968 mt_slots = clamp(mt_slots, 2, 32);
Jeff Brown80b48952011-04-18 10:08:02 -07001969 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
1970 mt_slots = 2;
1971 } else {
1972 mt_slots = 0;
1973 }
1974
1975 events = mt_slots + 1; /* count SYN_MT_REPORT and SYN_REPORT */
1976
1977 for (i = 0; i < ABS_CNT; i++) {
1978 if (test_bit(i, dev->absbit)) {
1979 if (input_is_mt_axis(i))
1980 events += mt_slots;
1981 else
1982 events++;
1983 }
1984 }
1985
1986 for (i = 0; i < REL_CNT; i++)
1987 if (test_bit(i, dev->relbit))
1988 events++;
1989
Henrik Rydberg7c75bf92012-09-01 16:15:43 +02001990 /* Make room for KEY and MSC events */
1991 events += 7;
1992
Jeff Brown80b48952011-04-18 10:08:02 -07001993 return events;
1994}
1995
Dmitry Torokhov92a3a582010-01-05 17:56:01 -08001996#define INPUT_CLEANSE_BITMASK(dev, type, bits) \
1997 do { \
1998 if (!test_bit(EV_##type, dev->evbit)) \
1999 memset(dev->bits##bit, 0, \
2000 sizeof(dev->bits##bit)); \
2001 } while (0)
2002
2003static void input_cleanse_bitmasks(struct input_dev *dev)
2004{
2005 INPUT_CLEANSE_BITMASK(dev, KEY, key);
2006 INPUT_CLEANSE_BITMASK(dev, REL, rel);
2007 INPUT_CLEANSE_BITMASK(dev, ABS, abs);
2008 INPUT_CLEANSE_BITMASK(dev, MSC, msc);
2009 INPUT_CLEANSE_BITMASK(dev, LED, led);
2010 INPUT_CLEANSE_BITMASK(dev, SND, snd);
2011 INPUT_CLEANSE_BITMASK(dev, FF, ff);
2012 INPUT_CLEANSE_BITMASK(dev, SW, sw);
2013}
2014
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07002015static void __input_unregister_device(struct input_dev *dev)
2016{
2017 struct input_handle *handle, *next;
2018
2019 input_disconnect_device(dev);
2020
2021 mutex_lock(&input_mutex);
2022
2023 list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
2024 handle->handler->disconnect(handle);
2025 WARN_ON(!list_empty(&dev->h_list));
2026
2027 del_timer_sync(&dev->timer);
2028 list_del_init(&dev->node);
2029
2030 input_wakeup_procfs_readers();
2031
2032 mutex_unlock(&input_mutex);
2033
2034 device_del(&dev->dev);
2035}
2036
2037static void devm_input_device_unregister(struct device *dev, void *res)
2038{
2039 struct input_devres *devres = res;
2040 struct input_dev *input = devres->input;
2041
2042 dev_dbg(dev, "%s: unregistering device %s\n",
2043 __func__, dev_name(&input->dev));
2044 __input_unregister_device(input);
2045}
2046
Dmitry Torokhov80064792007-08-30 00:22:11 -04002047/**
2048 * input_register_device - register device with input core
2049 * @dev: device to be registered
2050 *
2051 * This function registers device with input core. The device must be
2052 * allocated with input_allocate_device() and all it's capabilities
2053 * set up before registering.
2054 * If function fails the device must be freed with input_free_device().
2055 * Once device has been successfully registered it can be unregistered
2056 * with input_unregister_device(); input_free_device() should not be
2057 * called in this case.
Dmitry Torokhovb6662632013-01-08 09:10:31 -08002058 *
2059 * Note that this function is also used to register managed input devices
2060 * (ones allocated with devm_input_allocate_device()). Such managed input
2061 * devices need not be explicitly unregistered or freed, their tear down
2062 * is controlled by the devres infrastructure. It is also worth noting
2063 * that tear down of managed input devices is internally a 2-step process:
2064 * registered managed input device is first unregistered, but stays in
2065 * memory and can still handle input_event() calls (although events will
2066 * not be delivered anywhere). The freeing of managed input device will
2067 * happen later, when devres stack is unwound to the point where device
2068 * allocation was made.
Dmitry Torokhov80064792007-08-30 00:22:11 -04002069 */
Dmitry Torokhov5f945482005-11-02 22:51:46 -05002070int input_register_device(struct input_dev *dev)
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002071{
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07002072 struct input_devres *devres = NULL;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002073 struct input_handler *handler;
Henrik Rydberg7c75bf92012-09-01 16:15:43 +02002074 unsigned int packet_size;
Dmitry Torokhovbd0ef232005-11-20 00:56:31 -05002075 const char *path;
2076 int error;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002077
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07002078 if (dev->devres_managed) {
2079 devres = devres_alloc(devm_input_device_unregister,
2080 sizeof(struct input_devres), GFP_KERNEL);
2081 if (!devres)
2082 return -ENOMEM;
2083
2084 devres->input = dev;
2085 }
2086
Dmitry Torokhov4f93df42010-01-05 17:56:00 -08002087 /* Every input device generates EV_SYN/SYN_REPORT events. */
Dmitry Torokhov80064792007-08-30 00:22:11 -04002088 __set_bit(EV_SYN, dev->evbit);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002089
Dmitry Torokhov4f93df42010-01-05 17:56:00 -08002090 /* KEY_RESERVED is not supposed to be transmitted to userspace. */
2091 __clear_bit(KEY_RESERVED, dev->keybit);
2092
Dmitry Torokhov92a3a582010-01-05 17:56:01 -08002093 /* Make sure that bitmasks not mentioned in dev->evbit are clean. */
2094 input_cleanse_bitmasks(dev);
2095
Henrik Rydberg7c75bf92012-09-01 16:15:43 +02002096 packet_size = input_estimate_events_per_packet(dev);
2097 if (dev->hint_events_per_packet < packet_size)
2098 dev->hint_events_per_packet = packet_size;
Jeff Brown80b48952011-04-18 10:08:02 -07002099
Kang Hu95079b82013-10-31 00:47:53 -07002100 dev->max_vals = dev->hint_events_per_packet + 2;
Henrik Rydberg4369c642012-09-15 15:23:35 +02002101 dev->vals = kcalloc(dev->max_vals, sizeof(*dev->vals), GFP_KERNEL);
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07002102 if (!dev->vals) {
2103 error = -ENOMEM;
2104 goto err_devres_free;
2105 }
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002106
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002107 /*
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002108 * If delay and period are pre-set by the driver, then autorepeating
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002109 * is handled by the driver itself and we don't do it in input.c.
Dmitry Torokhov5f945482005-11-02 22:51:46 -05002110 */
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002111 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002112 dev->timer.data = (long) dev;
Dmitry Torokhov80064792007-08-30 00:22:11 -04002113 dev->timer.function = input_repeat_key;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002114 dev->rep[REP_DELAY] = 250;
Dmitry Torokhov80064792007-08-30 00:22:11 -04002115 dev->rep[REP_PERIOD] = 33;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002116 }
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002117
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002118 if (!dev->getkeycode)
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002119 dev->getkeycode = input_default_getkeycode;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002120
Dmitry Torokhov80064792007-08-30 00:22:11 -04002121 if (!dev->setkeycode)
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002122 dev->setkeycode = input_default_setkeycode;
2123
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002124 error = device_add(&dev->dev);
2125 if (error)
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07002126 goto err_free_vals;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002127
2128 path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
2129 pr_info("%s as %s\n",
2130 dev->name ? dev->name : "Unspecified device",
2131 path ? path : "N/A");
2132 kfree(path);
2133
2134 error = mutex_lock_interruptible(&input_mutex);
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07002135 if (error)
2136 goto err_device_del;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002137
2138 list_add_tail(&dev->node, &input_dev_list);
2139
2140 list_for_each_entry(handler, &input_handler_list, node)
2141 input_attach_handler(dev, handler);
2142
2143 input_wakeup_procfs_readers();
2144
2145 mutex_unlock(&input_mutex);
2146
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07002147 if (dev->devres_managed) {
2148 dev_dbg(dev->dev.parent, "%s: registering %s with devres.\n",
2149 __func__, dev_name(&dev->dev));
2150 devres_add(dev->dev.parent, devres);
2151 }
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002152 return 0;
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07002153
2154err_device_del:
2155 device_del(&dev->dev);
2156err_free_vals:
2157 kfree(dev->vals);
2158 dev->vals = NULL;
2159err_devres_free:
2160 devres_free(devres);
2161 return error;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002162}
2163EXPORT_SYMBOL(input_register_device);
2164
2165/**
2166 * input_unregister_device - unregister previously registered device
2167 * @dev: device to be unregistered
2168 *
2169 * This function unregisters an input device. Once device is unregistered
2170 * the caller should not try to access it as it may get freed at any moment.
2171 */
2172void input_unregister_device(struct input_dev *dev)
2173{
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07002174 if (dev->devres_managed) {
2175 WARN_ON(devres_destroy(dev->dev.parent,
2176 devm_input_device_unregister,
2177 devm_input_device_match,
2178 dev));
2179 __input_unregister_device(dev);
2180 /*
2181 * We do not do input_put_device() here because it will be done
2182 * when 2nd devres fires up.
2183 */
2184 } else {
2185 __input_unregister_device(dev);
2186 input_put_device(dev);
2187 }
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002188}
2189EXPORT_SYMBOL(input_unregister_device);
2190
Dmitry Torokhov80064792007-08-30 00:22:11 -04002191/**
2192 * input_register_handler - register a new input handler
2193 * @handler: handler to be registered
2194 *
2195 * This function registers a new input handler (interface) for input
2196 * devices in the system and attaches it to all input devices that
2197 * are compatible with the handler.
2198 */
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002199int input_register_handler(struct input_handler *handler)
2200{
2201 struct input_dev *dev;
Dmitry Torokhov7f8d4ca2012-10-08 09:07:24 -07002202 int error;
Dmitry Torokhov80064792007-08-30 00:22:11 -04002203
Dmitry Torokhov7f8d4ca2012-10-08 09:07:24 -07002204 error = mutex_lock_interruptible(&input_mutex);
2205 if (error)
2206 return error;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002207
2208 INIT_LIST_HEAD(&handler->h_list);
2209
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002210 list_add_tail(&handler->node, &input_handler_list);
2211
2212 list_for_each_entry(dev, &input_dev_list, node)
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002213 input_attach_handler(dev, handler);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002214
2215 input_wakeup_procfs_readers();
Dmitry Torokhov80064792007-08-30 00:22:11 -04002216
Dmitry Torokhov80064792007-08-30 00:22:11 -04002217 mutex_unlock(&input_mutex);
Dmitry Torokhov7f8d4ca2012-10-08 09:07:24 -07002218 return 0;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002219}
2220EXPORT_SYMBOL(input_register_handler);
2221
Dmitry Torokhov80064792007-08-30 00:22:11 -04002222/**
2223 * input_unregister_handler - unregisters an input handler
2224 * @handler: handler to be unregistered
2225 *
2226 * This function disconnects a handler from its input devices and
2227 * removes it from lists of known handlers.
2228 */
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002229void input_unregister_handler(struct input_handler *handler)
2230{
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002231 struct input_handle *handle, *next;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002232
Dmitry Torokhov80064792007-08-30 00:22:11 -04002233 mutex_lock(&input_mutex);
2234
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002235 list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002236 handler->disconnect(handle);
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002237 WARN_ON(!list_empty(&handler->h_list));
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002238
2239 list_del_init(&handler->node);
2240
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002241 input_wakeup_procfs_readers();
Dmitry Torokhov80064792007-08-30 00:22:11 -04002242
2243 mutex_unlock(&input_mutex);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002244}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -04002245EXPORT_SYMBOL(input_unregister_handler);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002246
Dmitry Torokhov80064792007-08-30 00:22:11 -04002247/**
Dmitry Torokhov66d2a592009-12-01 21:54:35 -08002248 * input_handler_for_each_handle - handle iterator
2249 * @handler: input handler to iterate
2250 * @data: data for the callback
2251 * @fn: function to be called for each handle
2252 *
2253 * Iterate over @bus's list of devices, and call @fn for each, passing
2254 * it @data and stop when @fn returns a non-zero value. The function is
2255 * using RCU to traverse the list and therefore may be usind in atonic
2256 * contexts. The @fn callback is invoked from RCU critical section and
2257 * thus must not sleep.
2258 */
2259int input_handler_for_each_handle(struct input_handler *handler, void *data,
2260 int (*fn)(struct input_handle *, void *))
2261{
2262 struct input_handle *handle;
2263 int retval = 0;
2264
2265 rcu_read_lock();
2266
2267 list_for_each_entry_rcu(handle, &handler->h_list, h_node) {
2268 retval = fn(handle, data);
2269 if (retval)
2270 break;
2271 }
2272
2273 rcu_read_unlock();
2274
2275 return retval;
2276}
2277EXPORT_SYMBOL(input_handler_for_each_handle);
2278
2279/**
Dmitry Torokhov80064792007-08-30 00:22:11 -04002280 * input_register_handle - register a new input handle
2281 * @handle: handle to register
2282 *
2283 * This function puts a new input handle onto device's
2284 * and handler's lists so that events can flow through
2285 * it once it is opened using input_open_device().
2286 *
2287 * This function is supposed to be called from handler's
2288 * connect() method.
2289 */
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002290int input_register_handle(struct input_handle *handle)
2291{
2292 struct input_handler *handler = handle->handler;
Dmitry Torokhov80064792007-08-30 00:22:11 -04002293 struct input_dev *dev = handle->dev;
2294 int error;
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002295
Dmitry Torokhov80064792007-08-30 00:22:11 -04002296 /*
2297 * We take dev->mutex here to prevent race with
2298 * input_release_device().
2299 */
2300 error = mutex_lock_interruptible(&dev->mutex);
2301 if (error)
2302 return error;
Dmitry Torokhovef7995f2010-01-29 23:59:12 -08002303
2304 /*
2305 * Filters go to the head of the list, normal handlers
2306 * to the tail.
2307 */
2308 if (handler->filter)
2309 list_add_rcu(&handle->d_node, &dev->h_list);
2310 else
2311 list_add_tail_rcu(&handle->d_node, &dev->h_list);
2312
Dmitry Torokhov80064792007-08-30 00:22:11 -04002313 mutex_unlock(&dev->mutex);
Dmitry Torokhov80064792007-08-30 00:22:11 -04002314
2315 /*
2316 * Since we are supposed to be called from ->connect()
2317 * which is mutually exclusive with ->disconnect()
2318 * we can't be racing with input_unregister_handle()
2319 * and so separate lock is not needed here.
2320 */
Dmitry Torokhov66d2a592009-12-01 21:54:35 -08002321 list_add_tail_rcu(&handle->h_node, &handler->h_list);
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002322
2323 if (handler->start)
2324 handler->start(handle);
2325
2326 return 0;
2327}
2328EXPORT_SYMBOL(input_register_handle);
2329
Dmitry Torokhov80064792007-08-30 00:22:11 -04002330/**
2331 * input_unregister_handle - unregister an input handle
2332 * @handle: handle to unregister
2333 *
2334 * This function removes input handle from device's
2335 * and handler's lists.
2336 *
2337 * This function is supposed to be called from handler's
2338 * disconnect() method.
2339 */
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002340void input_unregister_handle(struct input_handle *handle)
2341{
Dmitry Torokhov80064792007-08-30 00:22:11 -04002342 struct input_dev *dev = handle->dev;
2343
Dmitry Torokhov66d2a592009-12-01 21:54:35 -08002344 list_del_rcu(&handle->h_node);
Dmitry Torokhov80064792007-08-30 00:22:11 -04002345
2346 /*
2347 * Take dev->mutex to prevent race with input_release_device().
2348 */
2349 mutex_lock(&dev->mutex);
2350 list_del_rcu(&handle->d_node);
2351 mutex_unlock(&dev->mutex);
Dmitry Torokhov66d2a592009-12-01 21:54:35 -08002352
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -04002353 synchronize_rcu();
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002354}
2355EXPORT_SYMBOL(input_unregister_handle);
2356
Dmitry Torokhov7f8d4ca2012-10-08 09:07:24 -07002357/**
2358 * input_get_new_minor - allocates a new input minor number
2359 * @legacy_base: beginning or the legacy range to be searched
2360 * @legacy_num: size of legacy range
2361 * @allow_dynamic: whether we can also take ID from the dynamic range
2362 *
2363 * This function allocates a new device minor for from input major namespace.
2364 * Caller can request legacy minor by specifying @legacy_base and @legacy_num
2365 * parameters and whether ID can be allocated from dynamic range if there are
2366 * no free IDs in legacy range.
2367 */
2368int input_get_new_minor(int legacy_base, unsigned int legacy_num,
2369 bool allow_dynamic)
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002370{
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002371 /*
Dmitry Torokhov7f8d4ca2012-10-08 09:07:24 -07002372 * This function should be called from input handler's ->connect()
2373 * methods, which are serialized with input_mutex, so no additional
2374 * locking is needed here.
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002375 */
Dmitry Torokhov7f8d4ca2012-10-08 09:07:24 -07002376 if (legacy_base >= 0) {
2377 int minor = ida_simple_get(&input_ida,
2378 legacy_base,
2379 legacy_base + legacy_num,
2380 GFP_KERNEL);
2381 if (minor >= 0 || !allow_dynamic)
2382 return minor;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002383 }
Arnd Bergmann2f2177c2010-03-09 20:38:48 -08002384
Dmitry Torokhov7f8d4ca2012-10-08 09:07:24 -07002385 return ida_simple_get(&input_ida,
2386 INPUT_FIRST_DYNAMIC_DEV, INPUT_MAX_CHAR_DEVICES,
2387 GFP_KERNEL);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002388}
Dmitry Torokhov7f8d4ca2012-10-08 09:07:24 -07002389EXPORT_SYMBOL(input_get_new_minor);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002390
Dmitry Torokhov7f8d4ca2012-10-08 09:07:24 -07002391/**
2392 * input_free_minor - release previously allocated minor
2393 * @minor: minor to be released
2394 *
2395 * This function releases previously allocated input minor so that it can be
2396 * reused later.
2397 */
2398void input_free_minor(unsigned int minor)
2399{
2400 ida_simple_remove(&input_ida, minor);
2401}
2402EXPORT_SYMBOL(input_free_minor);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002403
Linus Torvalds1da177e2005-04-16 15:20:36 -07002404static int __init input_init(void)
2405{
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002406 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002407
Greg Kroah-Hartmanea9f2402005-10-27 22:25:43 -07002408 err = class_register(&input_class);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05002409 if (err) {
Joe Perchesda0c4902010-11-29 23:33:07 -08002410 pr_err("unable to register input_dev class\n");
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05002411 return err;
2412 }
2413
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002414 err = input_proc_init();
2415 if (err)
Greg Kroah-Hartmanb0fdfeb2005-10-27 22:25:43 -07002416 goto fail1;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002417
Dmitry Torokhov7f8d4ca2012-10-08 09:07:24 -07002418 err = register_chrdev_region(MKDEV(INPUT_MAJOR, 0),
2419 INPUT_MAX_CHAR_DEVICES, "input");
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002420 if (err) {
Joe Perchesda0c4902010-11-29 23:33:07 -08002421 pr_err("unable to register char major %d", INPUT_MAJOR);
Greg Kroah-Hartmanb0fdfeb2005-10-27 22:25:43 -07002422 goto fail2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002423 }
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002424
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002425 return 0;
2426
Greg Kroah-Hartmanb0fdfeb2005-10-27 22:25:43 -07002427 fail2: input_proc_exit();
Greg Kroah-Hartmanea9f2402005-10-27 22:25:43 -07002428 fail1: class_unregister(&input_class);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002429 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002430}
2431
2432static void __exit input_exit(void)
2433{
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002434 input_proc_exit();
Dmitry Torokhov7f8d4ca2012-10-08 09:07:24 -07002435 unregister_chrdev_region(MKDEV(INPUT_MAJOR, 0),
2436 INPUT_MAX_CHAR_DEVICES);
Greg Kroah-Hartmanea9f2402005-10-27 22:25:43 -07002437 class_unregister(&input_class);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002438}
2439
2440subsys_initcall(input_init);
2441module_exit(input_exit);