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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,
260 unsigned int type, unsigned int code, int value)
Dmitry Torokhov80064792007-08-30 00:22:11 -0400261{
262 int disposition = INPUT_IGNORE_EVENT;
263
264 switch (type) {
265
266 case EV_SYN:
267 switch (code) {
268 case SYN_CONFIG:
269 disposition = INPUT_PASS_TO_ALL;
270 break;
271
272 case SYN_REPORT:
Henrik Rydberg4369c642012-09-15 15:23:35 +0200273 disposition = INPUT_PASS_TO_HANDLERS | INPUT_FLUSH;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400274 break;
Henrik Rydberg5e5ee682009-04-28 07:47:33 -0700275 case SYN_MT_REPORT:
Henrik Rydberg5e5ee682009-04-28 07:47:33 -0700276 disposition = INPUT_PASS_TO_HANDLERS;
277 break;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400278 }
279 break;
280
281 case EV_KEY:
Henrik Rydberg06721202012-08-10 21:39:38 +0200282 if (is_event_supported(code, dev->keybit, KEY_MAX)) {
Dmitry Torokhov80064792007-08-30 00:22:11 -0400283
Henrik Rydberg06721202012-08-10 21:39:38 +0200284 /* auto-repeat bypasses state updates */
285 if (value == 2) {
286 disposition = INPUT_PASS_TO_HANDLERS;
287 break;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400288 }
289
Henrik Rydberg06721202012-08-10 21:39:38 +0200290 if (!!test_bit(code, dev->key) != !!value) {
291
Dmitry Torokhov80064792007-08-30 00:22:11 -0400292 __change_bit(code, dev->key);
Henrik Rydberg06721202012-08-10 21:39:38 +0200293 disposition = INPUT_PASS_TO_HANDLERS;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400294 }
Dmitry Torokhov80064792007-08-30 00:22:11 -0400295 }
296 break;
297
298 case EV_SW:
299 if (is_event_supported(code, dev->swbit, SW_MAX) &&
Henrik Rydberg06721202012-08-10 21:39:38 +0200300 !!test_bit(code, dev->sw) != !!value) {
Dmitry Torokhov80064792007-08-30 00:22:11 -0400301
302 __change_bit(code, dev->sw);
303 disposition = INPUT_PASS_TO_HANDLERS;
304 }
305 break;
306
307 case EV_ABS:
Henrik Rydberg40d007e2010-07-15 23:10:10 -0700308 if (is_event_supported(code, dev->absbit, ABS_MAX))
Dmitry Torokhov9ae43452011-02-02 23:04:27 -0800309 disposition = input_handle_abs_event(dev, code, &value);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400310
Dmitry Torokhov80064792007-08-30 00:22:11 -0400311 break;
312
313 case EV_REL:
314 if (is_event_supported(code, dev->relbit, REL_MAX) && value)
315 disposition = INPUT_PASS_TO_HANDLERS;
316
317 break;
318
319 case EV_MSC:
320 if (is_event_supported(code, dev->mscbit, MSC_MAX))
321 disposition = INPUT_PASS_TO_ALL;
322
323 break;
324
325 case EV_LED:
326 if (is_event_supported(code, dev->ledbit, LED_MAX) &&
Henrik Rydberg06721202012-08-10 21:39:38 +0200327 !!test_bit(code, dev->led) != !!value) {
Dmitry Torokhov80064792007-08-30 00:22:11 -0400328
329 __change_bit(code, dev->led);
330 disposition = INPUT_PASS_TO_ALL;
331 }
332 break;
333
334 case EV_SND:
335 if (is_event_supported(code, dev->sndbit, SND_MAX)) {
336
337 if (!!test_bit(code, dev->snd) != !!value)
338 __change_bit(code, dev->snd);
339 disposition = INPUT_PASS_TO_ALL;
340 }
341 break;
342
343 case EV_REP:
344 if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {
345 dev->rep[code] = value;
346 disposition = INPUT_PASS_TO_ALL;
347 }
348 break;
349
350 case EV_FF:
351 if (value >= 0)
352 disposition = INPUT_PASS_TO_ALL;
353 break;
Richard Purdieed2fa4d2008-01-03 10:46:21 -0500354
355 case EV_PWR:
356 disposition = INPUT_PASS_TO_ALL;
357 break;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400358 }
359
Henrik Rydberg4369c642012-09-15 15:23:35 +0200360 return disposition;
361}
362
363static void input_handle_event(struct input_dev *dev,
364 unsigned int type, unsigned int code, int value)
365{
366 int disposition;
367
368 disposition = input_get_disposition(dev, type, code, value);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400369
370 if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
371 dev->event(dev, type, code, value);
372
Henrik Rydberg4369c642012-09-15 15:23:35 +0200373 if (!dev->vals)
374 return;
375
376 if (disposition & INPUT_PASS_TO_HANDLERS) {
377 struct input_value *v;
378
379 if (disposition & INPUT_SLOT) {
380 v = &dev->vals[dev->num_vals++];
381 v->type = EV_ABS;
382 v->code = ABS_MT_SLOT;
383 v->value = dev->mt->slot;
384 }
385
386 v = &dev->vals[dev->num_vals++];
387 v->type = type;
388 v->code = code;
389 v->value = value;
390 }
391
392 if (disposition & INPUT_FLUSH) {
393 if (dev->num_vals >= 2)
394 input_pass_values(dev, dev->vals, dev->num_vals);
395 dev->num_vals = 0;
396 } else if (dev->num_vals >= dev->max_vals - 2) {
397 dev->vals[dev->num_vals++] = input_value_sync;
398 input_pass_values(dev, dev->vals, dev->num_vals);
399 dev->num_vals = 0;
400 }
401
Dmitry Torokhov80064792007-08-30 00:22:11 -0400402}
403
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400404/**
405 * input_event() - report new input event
Dmitry Torokhov14471902006-11-02 23:26:55 -0500406 * @dev: device that generated the event
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400407 * @type: type of the event
408 * @code: event code
409 * @value: value of the event
410 *
Dmitry Torokhov80064792007-08-30 00:22:11 -0400411 * This function should be used by drivers implementing various input
Dmitry Torokhovdf2d4632009-12-11 21:57:31 -0800412 * devices to report input events. See also input_inject_event().
413 *
414 * NOTE: input_event() may be safely used right after input device was
415 * allocated with input_allocate_device(), even before it is registered
416 * with input_register_device(), but the event will not reach any of the
417 * input handlers. Such early invocation of input_event() may be used
418 * to 'seed' initial state of a switch or initial position of absolute
419 * axis, etc.
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400420 */
Dmitry Torokhov80064792007-08-30 00:22:11 -0400421void input_event(struct input_dev *dev,
422 unsigned int type, unsigned int code, int value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423{
Dmitry Torokhov80064792007-08-30 00:22:11 -0400424 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425
Dmitry Torokhov80064792007-08-30 00:22:11 -0400426 if (is_event_supported(type, dev->evbit, EV_MAX)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
Dmitry Torokhov80064792007-08-30 00:22:11 -0400428 spin_lock_irqsave(&dev->event_lock, flags);
Dmitry Torokhov9ae43452011-02-02 23:04:27 -0800429 input_handle_event(dev, type, code, value);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400430 spin_unlock_irqrestore(&dev->event_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -0400433EXPORT_SYMBOL(input_event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400435/**
436 * input_inject_event() - send input event from input handler
437 * @handle: input handle to send event through
438 * @type: type of the event
439 * @code: event code
440 * @value: value of the event
441 *
Dmitry Torokhov80064792007-08-30 00:22:11 -0400442 * Similar to input_event() but will ignore event if device is
443 * "grabbed" and handle injecting event is not the one that owns
444 * the device.
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400445 */
Dmitry Torokhov80064792007-08-30 00:22:11 -0400446void input_inject_event(struct input_handle *handle,
447 unsigned int type, unsigned int code, int value)
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400448{
Dmitry Torokhov80064792007-08-30 00:22:11 -0400449 struct input_dev *dev = handle->dev;
450 struct input_handle *grab;
451 unsigned long flags;
452
453 if (is_event_supported(type, dev->evbit, EV_MAX)) {
454 spin_lock_irqsave(&dev->event_lock, flags);
455
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400456 rcu_read_lock();
Dmitry Torokhov80064792007-08-30 00:22:11 -0400457 grab = rcu_dereference(dev->grab);
458 if (!grab || grab == handle)
Dmitry Torokhov9ae43452011-02-02 23:04:27 -0800459 input_handle_event(dev, type, code, value);
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400460 rcu_read_unlock();
Dmitry Torokhov80064792007-08-30 00:22:11 -0400461
462 spin_unlock_irqrestore(&dev->event_lock, flags);
463 }
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400464}
465EXPORT_SYMBOL(input_inject_event);
466
Dmitry Torokhov80064792007-08-30 00:22:11 -0400467/**
Daniel Mackd31b2862010-08-02 20:18:21 -0700468 * input_alloc_absinfo - allocates array of input_absinfo structs
469 * @dev: the input device emitting absolute events
470 *
471 * If the absinfo struct the caller asked for is already allocated, this
472 * functions will not do anything.
473 */
474void input_alloc_absinfo(struct input_dev *dev)
475{
476 if (!dev->absinfo)
477 dev->absinfo = kcalloc(ABS_CNT, sizeof(struct input_absinfo),
478 GFP_KERNEL);
479
480 WARN(!dev->absinfo, "%s(): kcalloc() failed?\n", __func__);
481}
482EXPORT_SYMBOL(input_alloc_absinfo);
483
484void input_set_abs_params(struct input_dev *dev, unsigned int axis,
485 int min, int max, int fuzz, int flat)
486{
487 struct input_absinfo *absinfo;
488
489 input_alloc_absinfo(dev);
490 if (!dev->absinfo)
491 return;
492
493 absinfo = &dev->absinfo[axis];
494 absinfo->minimum = min;
495 absinfo->maximum = max;
496 absinfo->fuzz = fuzz;
497 absinfo->flat = flat;
498
499 dev->absbit[BIT_WORD(axis)] |= BIT_MASK(axis);
500}
501EXPORT_SYMBOL(input_set_abs_params);
502
503
504/**
Dmitry Torokhov80064792007-08-30 00:22:11 -0400505 * input_grab_device - grabs device for exclusive use
506 * @handle: input handle that wants to own the device
507 *
508 * When a device is grabbed by an input handle all events generated by
509 * the device are delivered only to this handle. Also events injected
510 * by other input handles are ignored while device is grabbed.
511 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512int input_grab_device(struct input_handle *handle)
513{
Dmitry Torokhov80064792007-08-30 00:22:11 -0400514 struct input_dev *dev = handle->dev;
515 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516
Dmitry Torokhov80064792007-08-30 00:22:11 -0400517 retval = mutex_lock_interruptible(&dev->mutex);
518 if (retval)
519 return retval;
520
521 if (dev->grab) {
522 retval = -EBUSY;
523 goto out;
524 }
525
526 rcu_assign_pointer(dev->grab, handle);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400527
528 out:
529 mutex_unlock(&dev->mutex);
530 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -0400532EXPORT_SYMBOL(input_grab_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533
Dmitry Torokhov80064792007-08-30 00:22:11 -0400534static void __input_release_device(struct input_handle *handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535{
Andrew Mortona2b2ed22006-07-15 01:17:38 -0400536 struct input_dev *dev = handle->dev;
Dmitry Torokhovadc46332012-10-24 23:53:01 -0700537 struct input_handle *grabber;
Dmitry Torokhovc7e8dc62006-07-06 00:21:03 -0400538
Dmitry Torokhovadc46332012-10-24 23:53:01 -0700539 grabber = rcu_dereference_protected(dev->grab,
540 lockdep_is_held(&dev->mutex));
541 if (grabber == handle) {
Dmitry Torokhov80064792007-08-30 00:22:11 -0400542 rcu_assign_pointer(dev->grab, NULL);
543 /* Make sure input_pass_event() notices that grab is gone */
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400544 synchronize_rcu();
Andrew Mortona2b2ed22006-07-15 01:17:38 -0400545
546 list_for_each_entry(handle, &dev->h_list, d_node)
Dmitry Torokhov80064792007-08-30 00:22:11 -0400547 if (handle->open && handle->handler->start)
Dmitry Torokhovc7e8dc62006-07-06 00:21:03 -0400548 handle->handler->start(handle);
549 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550}
Dmitry Torokhov80064792007-08-30 00:22:11 -0400551
552/**
553 * input_release_device - release previously grabbed device
554 * @handle: input handle that owns the device
555 *
556 * Releases previously grabbed device so that other input handles can
557 * start receiving input events. Upon release all handlers attached
558 * to the device have their start() method called so they have a change
559 * to synchronize device state with the rest of the system.
560 */
561void input_release_device(struct input_handle *handle)
562{
563 struct input_dev *dev = handle->dev;
564
565 mutex_lock(&dev->mutex);
566 __input_release_device(handle);
567 mutex_unlock(&dev->mutex);
568}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -0400569EXPORT_SYMBOL(input_release_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570
Dmitry Torokhov80064792007-08-30 00:22:11 -0400571/**
572 * input_open_device - open input device
573 * @handle: handle through which device is being accessed
574 *
575 * This function should be called by input handlers when they
576 * want to start receive events from given input device.
577 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578int input_open_device(struct input_handle *handle)
579{
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500580 struct input_dev *dev = handle->dev;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400581 int retval;
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500582
Dmitry Torokhov80064792007-08-30 00:22:11 -0400583 retval = mutex_lock_interruptible(&dev->mutex);
584 if (retval)
585 return retval;
586
587 if (dev->going_away) {
588 retval = -ENODEV;
589 goto out;
590 }
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500591
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 handle->open++;
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500593
594 if (!dev->users++ && dev->open)
Dmitry Torokhov80064792007-08-30 00:22:11 -0400595 retval = dev->open(dev);
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500596
Dmitry Torokhov80064792007-08-30 00:22:11 -0400597 if (retval) {
598 dev->users--;
599 if (!--handle->open) {
600 /*
601 * Make sure we are not delivering any more events
602 * through this handle
603 */
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400604 synchronize_rcu();
Dmitry Torokhov80064792007-08-30 00:22:11 -0400605 }
606 }
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500607
Dmitry Torokhov80064792007-08-30 00:22:11 -0400608 out:
Jes Sorensene676c232006-02-19 00:21:46 -0500609 mutex_unlock(&dev->mutex);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400610 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -0400612EXPORT_SYMBOL(input_open_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613
Dmitry Torokhov80064792007-08-30 00:22:11 -0400614int input_flush_device(struct input_handle *handle, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615{
Dmitry Torokhov80064792007-08-30 00:22:11 -0400616 struct input_dev *dev = handle->dev;
617 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618
Dmitry Torokhov80064792007-08-30 00:22:11 -0400619 retval = mutex_lock_interruptible(&dev->mutex);
620 if (retval)
621 return retval;
622
623 if (dev->flush)
624 retval = dev->flush(dev, file);
625
626 mutex_unlock(&dev->mutex);
627 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -0400629EXPORT_SYMBOL(input_flush_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630
Dmitry Torokhov80064792007-08-30 00:22:11 -0400631/**
632 * input_close_device - close input device
633 * @handle: handle through which device is being accessed
634 *
635 * This function should be called by input handlers when they
636 * want to stop receive events from given input device.
637 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638void input_close_device(struct input_handle *handle)
639{
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500640 struct input_dev *dev = handle->dev;
641
Jes Sorensene676c232006-02-19 00:21:46 -0500642 mutex_lock(&dev->mutex);
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500643
Dmitry Torokhov80064792007-08-30 00:22:11 -0400644 __input_release_device(handle);
645
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500646 if (!--dev->users && dev->close)
647 dev->close(dev);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400648
649 if (!--handle->open) {
650 /*
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400651 * synchronize_rcu() makes sure that input_pass_event()
Dmitry Torokhov80064792007-08-30 00:22:11 -0400652 * completed and that no more input events are delivered
653 * through this handle
654 */
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400655 synchronize_rcu();
Dmitry Torokhov80064792007-08-30 00:22:11 -0400656 }
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500657
Jes Sorensene676c232006-02-19 00:21:46 -0500658 mutex_unlock(&dev->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -0400660EXPORT_SYMBOL(input_close_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661
Dmitry Torokhov80064792007-08-30 00:22:11 -0400662/*
Oliver Neukum866d7d72010-07-01 09:01:50 -0700663 * Simulate keyup events for all keys that are marked as pressed.
664 * The function must be called with dev->event_lock held.
665 */
666static void input_dev_release_keys(struct input_dev *dev)
667{
668 int code;
669
670 if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
671 for (code = 0; code <= KEY_MAX; code++) {
672 if (is_event_supported(code, dev->keybit, KEY_MAX) &&
673 __test_and_clear_bit(code, dev->key)) {
Dmitry Torokhov9ae43452011-02-02 23:04:27 -0800674 input_pass_event(dev, EV_KEY, code, 0);
Oliver Neukum866d7d72010-07-01 09:01:50 -0700675 }
676 }
Dmitry Torokhov9ae43452011-02-02 23:04:27 -0800677 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
Oliver Neukum866d7d72010-07-01 09:01:50 -0700678 }
679}
680
681/*
Dmitry Torokhov80064792007-08-30 00:22:11 -0400682 * Prepare device for unregistering
683 */
684static void input_disconnect_device(struct input_dev *dev)
685{
686 struct input_handle *handle;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400687
688 /*
689 * Mark device as going away. Note that we take dev->mutex here
690 * not to protect access to dev->going_away but rather to ensure
691 * that there are no threads in the middle of input_open_device()
692 */
693 mutex_lock(&dev->mutex);
Dmitry Torokhovffd0db92009-09-16 01:06:43 -0700694 dev->going_away = true;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400695 mutex_unlock(&dev->mutex);
696
697 spin_lock_irq(&dev->event_lock);
698
699 /*
700 * Simulate keyup events for all pressed keys so that handlers
701 * are not left with "stuck" keys. The driver may continue
702 * generate events even after we done here but they will not
703 * reach any handlers.
704 */
Oliver Neukum866d7d72010-07-01 09:01:50 -0700705 input_dev_release_keys(dev);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400706
707 list_for_each_entry(handle, &dev->h_list, d_node)
708 handle->open = 0;
709
710 spin_unlock_irq(&dev->event_lock);
711}
712
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700713/**
714 * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry
715 * @ke: keymap entry containing scancode to be converted.
716 * @scancode: pointer to the location where converted scancode should
717 * be stored.
718 *
719 * This function is used to convert scancode stored in &struct keymap_entry
720 * into scalar form understood by legacy keymap handling methods. These
721 * methods expect scancodes to be represented as 'unsigned int'.
722 */
723int input_scancode_to_scalar(const struct input_keymap_entry *ke,
724 unsigned int *scancode)
725{
726 switch (ke->len) {
727 case 1:
728 *scancode = *((u8 *)ke->scancode);
729 break;
730
731 case 2:
732 *scancode = *((u16 *)ke->scancode);
733 break;
734
735 case 4:
736 *scancode = *((u32 *)ke->scancode);
737 break;
738
739 default:
740 return -EINVAL;
741 }
742
743 return 0;
744}
745EXPORT_SYMBOL(input_scancode_to_scalar);
746
747/*
748 * Those routines handle the default case where no [gs]etkeycode() is
749 * defined. In this case, an array indexed by the scancode is used.
750 */
751
752static unsigned int input_fetch_keycode(struct input_dev *dev,
753 unsigned int index)
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400754{
755 switch (dev->keycodesize) {
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700756 case 1:
757 return ((u8 *)dev->keycode)[index];
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400758
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700759 case 2:
760 return ((u16 *)dev->keycode)[index];
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400761
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700762 default:
763 return ((u32 *)dev->keycode)[index];
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400764 }
765}
766
767static int input_default_getkeycode(struct input_dev *dev,
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700768 struct input_keymap_entry *ke)
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400769{
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700770 unsigned int index;
771 int error;
772
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400773 if (!dev->keycodesize)
774 return -EINVAL;
775
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700776 if (ke->flags & INPUT_KEYMAP_BY_INDEX)
777 index = ke->index;
778 else {
779 error = input_scancode_to_scalar(ke, &index);
780 if (error)
781 return error;
782 }
783
784 if (index >= dev->keycodemax)
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400785 return -EINVAL;
786
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700787 ke->keycode = input_fetch_keycode(dev, index);
788 ke->index = index;
789 ke->len = sizeof(index);
790 memcpy(ke->scancode, &index, sizeof(index));
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400791
792 return 0;
793}
794
795static int input_default_setkeycode(struct input_dev *dev,
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700796 const struct input_keymap_entry *ke,
797 unsigned int *old_keycode)
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400798{
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700799 unsigned int index;
800 int error;
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400801 int i;
802
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400803 if (!dev->keycodesize)
804 return -EINVAL;
805
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700806 if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
807 index = ke->index;
808 } else {
809 error = input_scancode_to_scalar(ke, &index);
810 if (error)
811 return error;
812 }
813
814 if (index >= dev->keycodemax)
815 return -EINVAL;
816
Mattia Dongilide391d12010-11-18 09:06:43 -0800817 if (dev->keycodesize < sizeof(ke->keycode) &&
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700818 (ke->keycode >> (dev->keycodesize * 8)))
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400819 return -EINVAL;
820
821 switch (dev->keycodesize) {
822 case 1: {
823 u8 *k = (u8 *)dev->keycode;
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700824 *old_keycode = k[index];
825 k[index] = ke->keycode;
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400826 break;
827 }
828 case 2: {
829 u16 *k = (u16 *)dev->keycode;
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700830 *old_keycode = k[index];
831 k[index] = ke->keycode;
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400832 break;
833 }
834 default: {
835 u32 *k = (u32 *)dev->keycode;
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700836 *old_keycode = k[index];
837 k[index] = ke->keycode;
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400838 break;
839 }
840 }
841
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700842 __clear_bit(*old_keycode, dev->keybit);
843 __set_bit(ke->keycode, dev->keybit);
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400844
845 for (i = 0; i < dev->keycodemax; i++) {
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700846 if (input_fetch_keycode(dev, i) == *old_keycode) {
847 __set_bit(*old_keycode, dev->keybit);
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400848 break; /* Setting the bit twice is useless, so break */
849 }
850 }
851
852 return 0;
853}
854
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400855/**
856 * input_get_keycode - retrieve keycode currently mapped to a given scancode
857 * @dev: input device which keymap is being queried
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700858 * @ke: keymap entry
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400859 *
860 * This function should be called by anyone interested in retrieving current
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700861 * keymap. Presently evdev handlers use it.
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400862 */
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700863int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke)
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400864{
Dmitry Torokhov2e2e3b92010-03-21 22:56:15 -0700865 unsigned long flags;
866 int retval;
867
868 spin_lock_irqsave(&dev->event_lock, flags);
Dmitry Torokhovaebd6362011-01-31 21:06:39 -0800869 retval = dev->getkeycode(dev, ke);
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700870 spin_unlock_irqrestore(&dev->event_lock, flags);
Dmitry Torokhovaebd6362011-01-31 21:06:39 -0800871
Dmitry Torokhov2e2e3b92010-03-21 22:56:15 -0700872 return retval;
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400873}
874EXPORT_SYMBOL(input_get_keycode);
875
876/**
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700877 * input_set_keycode - attribute a keycode to a given scancode
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400878 * @dev: input device which keymap is being updated
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700879 * @ke: new keymap entry
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400880 *
881 * This function should be called by anyone needing to update current
882 * keymap. Presently keyboard and evdev handlers use it.
883 */
Dmitry Torokhov58b93992010-03-08 22:37:10 -0800884int input_set_keycode(struct input_dev *dev,
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700885 const struct input_keymap_entry *ke)
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400886{
887 unsigned long flags;
Dmitry Torokhovfd6cf3d2010-07-14 00:25:21 -0700888 unsigned int old_keycode;
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400889 int retval;
890
Mauro Carvalho Chehab8613e4c2010-09-09 21:54:22 -0700891 if (ke->keycode > KEY_MAX)
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400892 return -EINVAL;
893
894 spin_lock_irqsave(&dev->event_lock, flags);
895
Dmitry Torokhovaebd6362011-01-31 21:06:39 -0800896 retval = dev->setkeycode(dev, ke, &old_keycode);
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400897 if (retval)
898 goto out;
899
Dmitry Torokhov4f93df42010-01-05 17:56:00 -0800900 /* Make sure KEY_RESERVED did not get enabled. */
901 __clear_bit(KEY_RESERVED, dev->keybit);
902
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400903 /*
904 * Simulate keyup event if keycode is not present
905 * in the keymap anymore
906 */
907 if (test_bit(EV_KEY, dev->evbit) &&
908 !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&
909 __test_and_clear_bit(old_keycode, dev->key)) {
Henrik Rydberg4369c642012-09-15 15:23:35 +0200910 struct input_value vals[] = {
911 { EV_KEY, old_keycode, 0 },
912 input_value_sync
913 };
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400914
Henrik Rydberg4369c642012-09-15 15:23:35 +0200915 input_pass_values(dev, vals, ARRAY_SIZE(vals));
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400916 }
917
918 out:
919 spin_unlock_irqrestore(&dev->event_lock, flags);
920
921 return retval;
922}
923EXPORT_SYMBOL(input_set_keycode);
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400924
Dmitry Torokhov0b7024ac2010-02-02 21:08:26 -0800925static const struct input_device_id *input_match_device(struct input_handler *handler,
Dmitry Torokhov66e66112006-09-14 01:31:59 -0400926 struct input_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927{
Dmitry Torokhov0b7024ac2010-02-02 21:08:26 -0800928 const struct input_device_id *id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929
Dmitry Torokhov0b7024ac2010-02-02 21:08:26 -0800930 for (id = handler->id_table; id->flags || id->driver_info; id++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931
932 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
Dmitry Torokhovddc5d342006-04-26 00:14:19 -0400933 if (id->bustype != dev->id.bustype)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 continue;
935
936 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
Dmitry Torokhovddc5d342006-04-26 00:14:19 -0400937 if (id->vendor != dev->id.vendor)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 continue;
939
940 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
Dmitry Torokhovddc5d342006-04-26 00:14:19 -0400941 if (id->product != dev->id.product)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942 continue;
943
944 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
Dmitry Torokhovddc5d342006-04-26 00:14:19 -0400945 if (id->version != dev->id.version)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946 continue;
947
Dmitry Torokhovc0bb1f92012-07-31 22:08:55 -0700948 if (!bitmap_subset(id->evbit, dev->evbit, EV_MAX))
949 continue;
950
951 if (!bitmap_subset(id->keybit, dev->keybit, KEY_MAX))
952 continue;
953
954 if (!bitmap_subset(id->relbit, dev->relbit, REL_MAX))
955 continue;
956
957 if (!bitmap_subset(id->absbit, dev->absbit, ABS_MAX))
958 continue;
959
960 if (!bitmap_subset(id->mscbit, dev->mscbit, MSC_MAX))
961 continue;
962
963 if (!bitmap_subset(id->ledbit, dev->ledbit, LED_MAX))
964 continue;
965
966 if (!bitmap_subset(id->sndbit, dev->sndbit, SND_MAX))
967 continue;
968
969 if (!bitmap_subset(id->ffbit, dev->ffbit, FF_MAX))
970 continue;
971
972 if (!bitmap_subset(id->swbit, dev->swbit, SW_MAX))
973 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974
Dmitry Torokhov0b7024ac2010-02-02 21:08:26 -0800975 if (!handler->match || handler->match(handler, dev))
976 return id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977 }
978
979 return NULL;
980}
981
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400982static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
983{
984 const struct input_device_id *id;
985 int error;
986
Dmitry Torokhov0b7024ac2010-02-02 21:08:26 -0800987 id = input_match_device(handler, dev);
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400988 if (!id)
989 return -ENODEV;
990
991 error = handler->connect(handler, dev, id);
992 if (error && error != -ENODEV)
Joe Perchesda0c4902010-11-29 23:33:07 -0800993 pr_err("failed to attach handler %s to device %s, error: %d\n",
994 handler->name, kobject_name(&dev->dev.kobj), error);
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400995
996 return error;
997}
998
Dmitry Torokhov15e184a2010-01-11 00:05:43 -0800999#ifdef CONFIG_COMPAT
1000
1001static int input_bits_to_string(char *buf, int buf_size,
1002 unsigned long bits, bool skip_empty)
1003{
1004 int len = 0;
1005
1006 if (INPUT_COMPAT_TEST) {
1007 u32 dword = bits >> 32;
1008 if (dword || !skip_empty)
1009 len += snprintf(buf, buf_size, "%x ", dword);
1010
1011 dword = bits & 0xffffffffUL;
1012 if (dword || !skip_empty || len)
1013 len += snprintf(buf + len, max(buf_size - len, 0),
1014 "%x", dword);
1015 } else {
1016 if (bits || !skip_empty)
1017 len += snprintf(buf, buf_size, "%lx", bits);
1018 }
1019
1020 return len;
1021}
1022
1023#else /* !CONFIG_COMPAT */
1024
1025static int input_bits_to_string(char *buf, int buf_size,
1026 unsigned long bits, bool skip_empty)
1027{
1028 return bits || !skip_empty ?
1029 snprintf(buf, buf_size, "%lx", bits) : 0;
1030}
1031
1032#endif
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04001033
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034#ifdef CONFIG_PROC_FS
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001035
1036static struct proc_dir_entry *proc_bus_input_dir;
1037static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
1038static int input_devices_state;
1039
1040static inline void input_wakeup_procfs_readers(void)
1041{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 input_devices_state++;
1043 wake_up(&input_devices_poll_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044}
1045
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001046static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047{
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001048 poll_wait(file, &input_devices_poll_wait, wait);
Dmitry Torokhovfa886612009-03-04 00:52:20 -08001049 if (file->f_version != input_devices_state) {
1050 file->f_version = input_devices_state;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001051 return POLLIN | POLLRDNORM;
Dmitry Torokhovfa886612009-03-04 00:52:20 -08001052 }
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -04001053
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001054 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055}
1056
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001057union input_seq_state {
1058 struct {
1059 unsigned short pos;
1060 bool mutex_acquired;
1061 };
1062 void *p;
1063};
1064
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001065static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
1066{
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001067 union input_seq_state *state = (union input_seq_state *)&seq->private;
1068 int error;
1069
1070 /* We need to fit into seq->private pointer */
1071 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
1072
1073 error = mutex_lock_interruptible(&input_mutex);
1074 if (error) {
1075 state->mutex_acquired = false;
1076 return ERR_PTR(error);
1077 }
1078
1079 state->mutex_acquired = true;
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001080
Pavel Emelianovad5d9722007-07-18 00:38:32 -04001081 return seq_list_start(&input_dev_list, *pos);
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001082}
1083
1084static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1085{
Pavel Emelianovad5d9722007-07-18 00:38:32 -04001086 return seq_list_next(v, &input_dev_list, pos);
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001087}
1088
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001089static void input_seq_stop(struct seq_file *seq, void *v)
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001090{
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001091 union input_seq_state *state = (union input_seq_state *)&seq->private;
1092
1093 if (state->mutex_acquired)
1094 mutex_unlock(&input_mutex);
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001095}
1096
1097static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
1098 unsigned long *bitmap, int max)
1099{
1100 int i;
Dmitry Torokhov15e184a2010-01-11 00:05:43 -08001101 bool skip_empty = true;
1102 char buf[18];
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001103
1104 seq_printf(seq, "B: %s=", name);
Dmitry Torokhov15e184a2010-01-11 00:05:43 -08001105
1106 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1107 if (input_bits_to_string(buf, sizeof(buf),
1108 bitmap[i], skip_empty)) {
1109 skip_empty = false;
1110 seq_printf(seq, "%s%s", buf, i > 0 ? " " : "");
1111 }
1112 }
1113
1114 /*
1115 * If no output was produced print a single 0.
1116 */
1117 if (skip_empty)
1118 seq_puts(seq, "0");
1119
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001120 seq_putc(seq, '\n');
1121}
1122
1123static int input_devices_seq_show(struct seq_file *seq, void *v)
1124{
1125 struct input_dev *dev = container_of(v, struct input_dev, node);
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001126 const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127 struct input_handle *handle;
1128
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001129 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
1130 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001132 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
1133 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
1134 seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
Dmitry Torokhov15e03ae2007-03-07 23:20:17 -05001135 seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001136 seq_printf(seq, "H: Handlers=");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001138 list_for_each_entry(handle, &dev->h_list, d_node)
1139 seq_printf(seq, "%s ", handle->name);
1140 seq_putc(seq, '\n');
Dmitry Torokhov051b2fe2005-09-15 02:01:54 -05001141
Henrik Rydberg85b77202010-12-18 20:51:13 +01001142 input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX);
1143
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001144 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
1145 if (test_bit(EV_KEY, dev->evbit))
1146 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
1147 if (test_bit(EV_REL, dev->evbit))
1148 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
1149 if (test_bit(EV_ABS, dev->evbit))
1150 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
1151 if (test_bit(EV_MSC, dev->evbit))
1152 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
1153 if (test_bit(EV_LED, dev->evbit))
1154 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
1155 if (test_bit(EV_SND, dev->evbit))
1156 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
1157 if (test_bit(EV_FF, dev->evbit))
1158 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
1159 if (test_bit(EV_SW, dev->evbit))
1160 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001162 seq_putc(seq, '\n');
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001164 kfree(path);
1165 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166}
1167
Jan Engelhardtcec69c32008-01-31 00:43:32 -05001168static const struct seq_operations input_devices_seq_ops = {
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001169 .start = input_devices_seq_start,
1170 .next = input_devices_seq_next,
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001171 .stop = input_seq_stop,
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001172 .show = input_devices_seq_show,
1173};
1174
1175static int input_proc_devices_open(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176{
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001177 return seq_open(file, &input_devices_seq_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178}
1179
Arjan van de Ven2b8693c2007-02-12 00:55:32 -08001180static const struct file_operations input_devices_fileops = {
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001181 .owner = THIS_MODULE,
1182 .open = input_proc_devices_open,
1183 .poll = input_proc_devices_poll,
1184 .read = seq_read,
1185 .llseek = seq_lseek,
1186 .release = seq_release,
1187};
1188
1189static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
1190{
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001191 union input_seq_state *state = (union input_seq_state *)&seq->private;
1192 int error;
Dmitry Torokhov80064792007-08-30 00:22:11 -04001193
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001194 /* We need to fit into seq->private pointer */
1195 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
1196
1197 error = mutex_lock_interruptible(&input_mutex);
1198 if (error) {
1199 state->mutex_acquired = false;
1200 return ERR_PTR(error);
1201 }
1202
1203 state->mutex_acquired = true;
1204 state->pos = *pos;
1205
Pavel Emelianovad5d9722007-07-18 00:38:32 -04001206 return seq_list_start(&input_handler_list, *pos);
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001207}
1208
1209static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1210{
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001211 union input_seq_state *state = (union input_seq_state *)&seq->private;
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001212
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001213 state->pos = *pos + 1;
1214 return seq_list_next(v, &input_handler_list, pos);
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001215}
1216
1217static int input_handlers_seq_show(struct seq_file *seq, void *v)
1218{
1219 struct input_handler *handler = container_of(v, struct input_handler, node);
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001220 union input_seq_state *state = (union input_seq_state *)&seq->private;
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001221
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001222 seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name);
Dmitry Torokhovef7995f2010-01-29 23:59:12 -08001223 if (handler->filter)
1224 seq_puts(seq, " (filter)");
Dmitry Torokhov7f8d4ca2012-10-08 09:07:24 -07001225 if (handler->legacy_minors)
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001226 seq_printf(seq, " Minor=%d", handler->minor);
1227 seq_putc(seq, '\n');
1228
1229 return 0;
1230}
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001231
Jan Engelhardtcec69c32008-01-31 00:43:32 -05001232static const struct seq_operations input_handlers_seq_ops = {
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001233 .start = input_handlers_seq_start,
1234 .next = input_handlers_seq_next,
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001235 .stop = input_seq_stop,
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001236 .show = input_handlers_seq_show,
1237};
1238
1239static int input_proc_handlers_open(struct inode *inode, struct file *file)
1240{
1241 return seq_open(file, &input_handlers_seq_ops);
1242}
1243
Arjan van de Ven2b8693c2007-02-12 00:55:32 -08001244static const struct file_operations input_handlers_fileops = {
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001245 .owner = THIS_MODULE,
1246 .open = input_proc_handlers_open,
1247 .read = seq_read,
1248 .llseek = seq_lseek,
1249 .release = seq_release,
1250};
Luke Kosewskie334016fc2005-06-01 02:39:28 -05001251
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252static int __init input_proc_init(void)
1253{
1254 struct proc_dir_entry *entry;
1255
Alexey Dobriyan9c370662008-04-29 01:01:41 -07001256 proc_bus_input_dir = proc_mkdir("bus/input", NULL);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001257 if (!proc_bus_input_dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258 return -ENOMEM;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001259
Denis V. Lunevc7705f32008-04-29 01:02:35 -07001260 entry = proc_create("devices", 0, proc_bus_input_dir,
1261 &input_devices_fileops);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001262 if (!entry)
1263 goto fail1;
1264
Denis V. Lunevc7705f32008-04-29 01:02:35 -07001265 entry = proc_create("handlers", 0, proc_bus_input_dir,
1266 &input_handlers_fileops);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001267 if (!entry)
1268 goto fail2;
1269
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 return 0;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001271
1272 fail2: remove_proc_entry("devices", proc_bus_input_dir);
Alexey Dobriyan9c370662008-04-29 01:01:41 -07001273 fail1: remove_proc_entry("bus/input", NULL);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001274 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275}
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001276
Andrew Mortonbeffbdc2005-07-01 23:54:30 -05001277static void input_proc_exit(void)
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001278{
1279 remove_proc_entry("devices", proc_bus_input_dir);
1280 remove_proc_entry("handlers", proc_bus_input_dir);
Alexey Dobriyan9c370662008-04-29 01:01:41 -07001281 remove_proc_entry("bus/input", NULL);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001282}
1283
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284#else /* !CONFIG_PROC_FS */
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001285static inline void input_wakeup_procfs_readers(void) { }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286static inline int input_proc_init(void) { return 0; }
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001287static inline void input_proc_exit(void) { }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288#endif
1289
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001290#define INPUT_DEV_STRING_ATTR_SHOW(name) \
1291static ssize_t input_dev_show_##name(struct device *dev, \
1292 struct device_attribute *attr, \
1293 char *buf) \
1294{ \
1295 struct input_dev *input_dev = to_input_dev(dev); \
1296 \
1297 return scnprintf(buf, PAGE_SIZE, "%s\n", \
1298 input_dev->name ? input_dev->name : ""); \
1299} \
1300static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
Dmitry Torokhov5c1e9a62005-09-15 02:01:55 -05001301
1302INPUT_DEV_STRING_ATTR_SHOW(name);
1303INPUT_DEV_STRING_ATTR_SHOW(phys);
1304INPUT_DEV_STRING_ATTR_SHOW(uniq);
1305
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001306static int input_print_modalias_bits(char *buf, int size,
1307 char name, unsigned long *bm,
1308 unsigned int min_bit, unsigned int max_bit)
Rusty Russell1d8f4302005-12-07 21:40:34 +01001309{
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001310 int len = 0, i;
Rusty Russell1d8f4302005-12-07 21:40:34 +01001311
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001312 len += snprintf(buf, max(size, 0), "%c", name);
1313 for (i = min_bit; i < max_bit; i++)
Jiri Slaby7b19ada2007-10-18 23:40:32 -07001314 if (bm[BIT_WORD(i)] & BIT_MASK(i))
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001315 len += snprintf(buf + len, max(size - len, 0), "%X,", i);
Kay Sieversbd37e5a2006-01-05 13:19:55 +01001316 return len;
1317}
1318
Dmitry Torokhov2db66872006-04-02 00:09:26 -05001319static int input_print_modalias(char *buf, int size, struct input_dev *id,
1320 int add_cr)
Kay Sieversbd37e5a2006-01-05 13:19:55 +01001321{
1322 int len;
1323
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001324 len = snprintf(buf, max(size, 0),
1325 "input:b%04Xv%04Xp%04Xe%04X-",
1326 id->id.bustype, id->id.vendor,
1327 id->id.product, id->id.version);
Kay Sieversbd37e5a2006-01-05 13:19:55 +01001328
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001329 len += input_print_modalias_bits(buf + len, size - len,
1330 'e', id->evbit, 0, EV_MAX);
1331 len += input_print_modalias_bits(buf + len, size - len,
1332 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
1333 len += input_print_modalias_bits(buf + len, size - len,
1334 'r', id->relbit, 0, REL_MAX);
1335 len += input_print_modalias_bits(buf + len, size - len,
1336 'a', id->absbit, 0, ABS_MAX);
1337 len += input_print_modalias_bits(buf + len, size - len,
1338 'm', id->mscbit, 0, MSC_MAX);
1339 len += input_print_modalias_bits(buf + len, size - len,
1340 'l', id->ledbit, 0, LED_MAX);
1341 len += input_print_modalias_bits(buf + len, size - len,
1342 's', id->sndbit, 0, SND_MAX);
1343 len += input_print_modalias_bits(buf + len, size - len,
1344 'f', id->ffbit, 0, FF_MAX);
1345 len += input_print_modalias_bits(buf + len, size - len,
1346 'w', id->swbit, 0, SW_MAX);
Dmitry Torokhov2db66872006-04-02 00:09:26 -05001347
1348 if (add_cr)
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001349 len += snprintf(buf + len, max(size - len, 0), "\n");
Dmitry Torokhov2db66872006-04-02 00:09:26 -05001350
Rusty Russell1d8f4302005-12-07 21:40:34 +01001351 return len;
1352}
1353
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001354static ssize_t input_dev_show_modalias(struct device *dev,
1355 struct device_attribute *attr,
1356 char *buf)
Rusty Russell1d8f4302005-12-07 21:40:34 +01001357{
1358 struct input_dev *id = to_input_dev(dev);
Kay Sieversbd37e5a2006-01-05 13:19:55 +01001359 ssize_t len;
Rusty Russell1d8f4302005-12-07 21:40:34 +01001360
Dmitry Torokhov2db66872006-04-02 00:09:26 -05001361 len = input_print_modalias(buf, PAGE_SIZE, id, 1);
1362
Richard Purdie8a3cf452006-06-26 01:48:21 -04001363 return min_t(int, len, PAGE_SIZE);
Rusty Russell1d8f4302005-12-07 21:40:34 +01001364}
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001365static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
Rusty Russell1d8f4302005-12-07 21:40:34 +01001366
Henrik Rydberg85b77202010-12-18 20:51:13 +01001367static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1368 int max, int add_cr);
1369
1370static ssize_t input_dev_show_properties(struct device *dev,
1371 struct device_attribute *attr,
1372 char *buf)
1373{
1374 struct input_dev *input_dev = to_input_dev(dev);
1375 int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit,
1376 INPUT_PROP_MAX, true);
1377 return min_t(int, len, PAGE_SIZE);
1378}
1379static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL);
1380
Greg Kroah-Hartman629b77a2005-10-27 22:25:43 -07001381static struct attribute *input_dev_attrs[] = {
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001382 &dev_attr_name.attr,
1383 &dev_attr_phys.attr,
1384 &dev_attr_uniq.attr,
1385 &dev_attr_modalias.attr,
Henrik Rydberg85b77202010-12-18 20:51:13 +01001386 &dev_attr_properties.attr,
Greg Kroah-Hartman629b77a2005-10-27 22:25:43 -07001387 NULL
1388};
1389
Dmitry Torokhovbd0ef232005-11-20 00:56:31 -05001390static struct attribute_group input_dev_attr_group = {
Greg Kroah-Hartman629b77a2005-10-27 22:25:43 -07001391 .attrs = input_dev_attrs,
Dmitry Torokhov5c1e9a62005-09-15 02:01:55 -05001392};
1393
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001394#define INPUT_DEV_ID_ATTR(name) \
1395static ssize_t input_dev_show_id_##name(struct device *dev, \
1396 struct device_attribute *attr, \
1397 char *buf) \
1398{ \
1399 struct input_dev *input_dev = to_input_dev(dev); \
1400 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
1401} \
1402static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
Dmitry Torokhov5c1e9a62005-09-15 02:01:55 -05001403
1404INPUT_DEV_ID_ATTR(bustype);
1405INPUT_DEV_ID_ATTR(vendor);
1406INPUT_DEV_ID_ATTR(product);
1407INPUT_DEV_ID_ATTR(version);
1408
1409static struct attribute *input_dev_id_attrs[] = {
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001410 &dev_attr_bustype.attr,
1411 &dev_attr_vendor.attr,
1412 &dev_attr_product.attr,
1413 &dev_attr_version.attr,
Dmitry Torokhov5c1e9a62005-09-15 02:01:55 -05001414 NULL
1415};
1416
1417static struct attribute_group input_dev_id_attr_group = {
1418 .name = "id",
1419 .attrs = input_dev_id_attrs,
1420};
1421
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001422static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1423 int max, int add_cr)
1424{
1425 int i;
1426 int len = 0;
Dmitry Torokhov15e184a2010-01-11 00:05:43 -08001427 bool skip_empty = true;
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001428
Dmitry Torokhov15e184a2010-01-11 00:05:43 -08001429 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1430 len += input_bits_to_string(buf + len, max(buf_size - len, 0),
1431 bitmap[i], skip_empty);
1432 if (len) {
1433 skip_empty = false;
1434 if (i > 0)
1435 len += snprintf(buf + len, max(buf_size - len, 0), " ");
1436 }
1437 }
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001438
Dmitry Torokhov15e184a2010-01-11 00:05:43 -08001439 /*
1440 * If no output was produced print a single 0.
1441 */
1442 if (len == 0)
1443 len = snprintf(buf, buf_size, "%d", 0);
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001444
1445 if (add_cr)
1446 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
1447
1448 return len;
1449}
1450
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001451#define INPUT_DEV_CAP_ATTR(ev, bm) \
1452static ssize_t input_dev_show_cap_##bm(struct device *dev, \
1453 struct device_attribute *attr, \
1454 char *buf) \
1455{ \
1456 struct input_dev *input_dev = to_input_dev(dev); \
1457 int len = input_print_bitmap(buf, PAGE_SIZE, \
Dmitry Torokhov15e184a2010-01-11 00:05:43 -08001458 input_dev->bm##bit, ev##_MAX, \
1459 true); \
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001460 return min_t(int, len, PAGE_SIZE); \
1461} \
1462static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
Dmitry Torokhov5c1e9a62005-09-15 02:01:55 -05001463
1464INPUT_DEV_CAP_ATTR(EV, ev);
1465INPUT_DEV_CAP_ATTR(KEY, key);
1466INPUT_DEV_CAP_ATTR(REL, rel);
1467INPUT_DEV_CAP_ATTR(ABS, abs);
1468INPUT_DEV_CAP_ATTR(MSC, msc);
1469INPUT_DEV_CAP_ATTR(LED, led);
1470INPUT_DEV_CAP_ATTR(SND, snd);
1471INPUT_DEV_CAP_ATTR(FF, ff);
1472INPUT_DEV_CAP_ATTR(SW, sw);
1473
1474static struct attribute *input_dev_caps_attrs[] = {
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001475 &dev_attr_ev.attr,
1476 &dev_attr_key.attr,
1477 &dev_attr_rel.attr,
1478 &dev_attr_abs.attr,
1479 &dev_attr_msc.attr,
1480 &dev_attr_led.attr,
1481 &dev_attr_snd.attr,
1482 &dev_attr_ff.attr,
1483 &dev_attr_sw.attr,
Dmitry Torokhov5c1e9a62005-09-15 02:01:55 -05001484 NULL
1485};
1486
1487static struct attribute_group input_dev_caps_attr_group = {
1488 .name = "capabilities",
1489 .attrs = input_dev_caps_attrs,
1490};
1491
David Brownella4dbd672009-06-24 10:06:31 -07001492static const struct attribute_group *input_dev_attr_groups[] = {
Dmitry Torokhovcb9def42007-03-07 23:20:26 -05001493 &input_dev_attr_group,
1494 &input_dev_id_attr_group,
1495 &input_dev_caps_attr_group,
1496 NULL
1497};
1498
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001499static void input_dev_release(struct device *device)
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001500{
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001501 struct input_dev *dev = to_input_dev(device);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001502
Anssi Hannula509ca1a2006-07-19 01:40:22 -04001503 input_ff_destroy(dev);
Henrik Rydberg40d007e2010-07-15 23:10:10 -07001504 input_mt_destroy_slots(dev);
Daniel Mackd31b2862010-08-02 20:18:21 -07001505 kfree(dev->absinfo);
Henrik Rydberg4369c642012-09-15 15:23:35 +02001506 kfree(dev->vals);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001507 kfree(dev);
Anssi Hannula509ca1a2006-07-19 01:40:22 -04001508
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001509 module_put(THIS_MODULE);
1510}
1511
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001512/*
Kay Sievers312c0042005-11-16 09:00:00 +01001513 * Input uevent interface - loading event handlers based on
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001514 * device bitfields.
1515 */
Kay Sievers7eff2e72007-08-14 15:15:12 +02001516static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001517 const char *name, unsigned long *bitmap, int max)
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001518{
Kay Sievers7eff2e72007-08-14 15:15:12 +02001519 int len;
1520
Henrik Rydbergfcd30272010-12-18 20:28:26 +01001521 if (add_uevent_var(env, "%s", name))
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001522 return -ENOMEM;
1523
Kay Sievers7eff2e72007-08-14 15:15:12 +02001524 len = input_print_bitmap(&env->buf[env->buflen - 1],
1525 sizeof(env->buf) - env->buflen,
Dmitry Torokhov15e184a2010-01-11 00:05:43 -08001526 bitmap, max, false);
Kay Sievers7eff2e72007-08-14 15:15:12 +02001527 if (len >= (sizeof(env->buf) - env->buflen))
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001528 return -ENOMEM;
1529
Kay Sievers7eff2e72007-08-14 15:15:12 +02001530 env->buflen += len;
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001531 return 0;
1532}
1533
Kay Sievers7eff2e72007-08-14 15:15:12 +02001534static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001535 struct input_dev *dev)
1536{
Kay Sievers7eff2e72007-08-14 15:15:12 +02001537 int len;
1538
1539 if (add_uevent_var(env, "MODALIAS="))
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001540 return -ENOMEM;
1541
Kay Sievers7eff2e72007-08-14 15:15:12 +02001542 len = input_print_modalias(&env->buf[env->buflen - 1],
1543 sizeof(env->buf) - env->buflen,
1544 dev, 0);
1545 if (len >= (sizeof(env->buf) - env->buflen))
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001546 return -ENOMEM;
1547
Kay Sievers7eff2e72007-08-14 15:15:12 +02001548 env->buflen += len;
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001549 return 0;
1550}
1551
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001552#define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
1553 do { \
Kay Sievers7eff2e72007-08-14 15:15:12 +02001554 int err = add_uevent_var(env, fmt, val); \
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001555 if (err) \
1556 return err; \
1557 } while (0)
1558
1559#define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
1560 do { \
Kay Sievers7eff2e72007-08-14 15:15:12 +02001561 int err = input_add_uevent_bm_var(env, name, bm, max); \
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001562 if (err) \
1563 return err; \
1564 } while (0)
1565
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001566#define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
1567 do { \
Kay Sievers7eff2e72007-08-14 15:15:12 +02001568 int err = input_add_uevent_modalias_var(env, dev); \
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001569 if (err) \
1570 return err; \
1571 } while (0)
1572
Kay Sievers7eff2e72007-08-14 15:15:12 +02001573static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001574{
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001575 struct input_dev *dev = to_input_dev(device);
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001576
1577 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
1578 dev->id.bustype, dev->id.vendor,
1579 dev->id.product, dev->id.version);
1580 if (dev->name)
1581 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
1582 if (dev->phys)
1583 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
Dmitry Torokhov08de1f02005-11-08 21:34:29 -08001584 if (dev->uniq)
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001585 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
1586
Henrik Rydberg85b77202010-12-18 20:51:13 +01001587 INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX);
1588
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001589 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
1590 if (test_bit(EV_KEY, dev->evbit))
1591 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
1592 if (test_bit(EV_REL, dev->evbit))
1593 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
1594 if (test_bit(EV_ABS, dev->evbit))
1595 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
1596 if (test_bit(EV_MSC, dev->evbit))
1597 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
1598 if (test_bit(EV_LED, dev->evbit))
1599 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
1600 if (test_bit(EV_SND, dev->evbit))
1601 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
1602 if (test_bit(EV_FF, dev->evbit))
1603 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
1604 if (test_bit(EV_SW, dev->evbit))
1605 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
1606
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001607 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001608
1609 return 0;
1610}
1611
Dmitry Torokhov3cc96352009-11-12 23:19:05 -08001612#define INPUT_DO_TOGGLE(dev, type, bits, on) \
1613 do { \
1614 int i; \
1615 bool active; \
1616 \
1617 if (!test_bit(EV_##type, dev->evbit)) \
1618 break; \
1619 \
1620 for (i = 0; i < type##_MAX; i++) { \
1621 if (!test_bit(i, dev->bits##bit)) \
1622 continue; \
1623 \
1624 active = test_bit(i, dev->bits); \
1625 if (!active && !on) \
1626 continue; \
1627 \
1628 dev->event(dev, EV_##type, i, on ? active : 0); \
1629 } \
Dmitry Torokhovffd0db92009-09-16 01:06:43 -07001630 } while (0)
1631
Dmitry Torokhovb50b5212010-11-03 11:02:31 -07001632static void input_dev_toggle(struct input_dev *dev, bool activate)
Dmitry Torokhovffd0db92009-09-16 01:06:43 -07001633{
1634 if (!dev->event)
1635 return;
1636
1637 INPUT_DO_TOGGLE(dev, LED, led, activate);
1638 INPUT_DO_TOGGLE(dev, SND, snd, activate);
1639
1640 if (activate && test_bit(EV_REP, dev->evbit)) {
1641 dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]);
1642 dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]);
1643 }
1644}
1645
Dmitry Torokhovb50b5212010-11-03 11:02:31 -07001646/**
1647 * input_reset_device() - reset/restore the state of input device
1648 * @dev: input device whose state needs to be reset
1649 *
1650 * This function tries to reset the state of an opened input device and
1651 * bring internal state and state if the hardware in sync with each other.
1652 * We mark all keys as released, restore LED state, repeat rate, etc.
1653 */
1654void input_reset_device(struct input_dev *dev)
1655{
Aleksej Makarov768d9aa2013-11-23 10:20:36 -08001656 unsigned long flags;
1657
Dmitry Torokhovb50b5212010-11-03 11:02:31 -07001658 mutex_lock(&dev->mutex);
Aleksej Makarov768d9aa2013-11-23 10:20:36 -08001659 spin_lock_irqsave(&dev->event_lock, flags);
Dmitry Torokhovb50b5212010-11-03 11:02:31 -07001660
Aleksej Makarov768d9aa2013-11-23 10:20:36 -08001661 input_dev_toggle(dev, true);
1662 input_dev_release_keys(dev);
Dmitry Torokhovb50b5212010-11-03 11:02:31 -07001663
Aleksej Makarov768d9aa2013-11-23 10:20:36 -08001664 spin_unlock_irqrestore(&dev->event_lock, flags);
Dmitry Torokhovb50b5212010-11-03 11:02:31 -07001665 mutex_unlock(&dev->mutex);
1666}
1667EXPORT_SYMBOL(input_reset_device);
1668
Aleksej Makarov768d9aa2013-11-23 10:20:36 -08001669#ifdef CONFIG_PM_SLEEP
Dmitry Torokhovffd0db92009-09-16 01:06:43 -07001670static int input_dev_suspend(struct device *dev)
1671{
1672 struct input_dev *input_dev = to_input_dev(dev);
1673
Aleksej Makarov768d9aa2013-11-23 10:20:36 -08001674 spin_lock_irq(&input_dev->event_lock);
Dmitry Torokhovb50b5212010-11-03 11:02:31 -07001675
Aleksej Makarov768d9aa2013-11-23 10:20:36 -08001676 /*
1677 * Keys that are pressed now are unlikely to be
1678 * still pressed when we resume.
1679 */
1680 input_dev_release_keys(input_dev);
Dmitry Torokhovb50b5212010-11-03 11:02:31 -07001681
Aleksej Makarov768d9aa2013-11-23 10:20:36 -08001682 /* Turn off LEDs and sounds, if any are active. */
1683 input_dev_toggle(input_dev, false);
1684
1685 spin_unlock_irq(&input_dev->event_lock);
Dmitry Torokhovffd0db92009-09-16 01:06:43 -07001686
1687 return 0;
1688}
1689
1690static int input_dev_resume(struct device *dev)
1691{
1692 struct input_dev *input_dev = to_input_dev(dev);
1693
Aleksej Makarov768d9aa2013-11-23 10:20:36 -08001694 spin_lock_irq(&input_dev->event_lock);
1695
1696 /* Restore state of LEDs and sounds, if any were active. */
1697 input_dev_toggle(input_dev, true);
1698
1699 spin_unlock_irq(&input_dev->event_lock);
1700
1701 return 0;
1702}
1703
1704static int input_dev_freeze(struct device *dev)
1705{
1706 struct input_dev *input_dev = to_input_dev(dev);
1707
1708 spin_lock_irq(&input_dev->event_lock);
1709
1710 /*
1711 * Keys that are pressed now are unlikely to be
1712 * still pressed when we resume.
1713 */
1714 input_dev_release_keys(input_dev);
1715
1716 spin_unlock_irq(&input_dev->event_lock);
1717
1718 return 0;
1719}
1720
1721static int input_dev_poweroff(struct device *dev)
1722{
1723 struct input_dev *input_dev = to_input_dev(dev);
1724
1725 spin_lock_irq(&input_dev->event_lock);
1726
1727 /* Turn off LEDs and sounds, if any are active. */
1728 input_dev_toggle(input_dev, false);
1729
1730 spin_unlock_irq(&input_dev->event_lock);
Dmitry Torokhovffd0db92009-09-16 01:06:43 -07001731
1732 return 0;
1733}
1734
1735static const struct dev_pm_ops input_dev_pm_ops = {
1736 .suspend = input_dev_suspend,
1737 .resume = input_dev_resume,
Aleksej Makarov768d9aa2013-11-23 10:20:36 -08001738 .freeze = input_dev_freeze,
1739 .poweroff = input_dev_poweroff,
Dmitry Torokhovffd0db92009-09-16 01:06:43 -07001740 .restore = input_dev_resume,
1741};
1742#endif /* CONFIG_PM */
1743
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001744static struct device_type input_dev_type = {
1745 .groups = input_dev_attr_groups,
1746 .release = input_dev_release,
1747 .uevent = input_dev_uevent,
Aleksej Makarov768d9aa2013-11-23 10:20:36 -08001748#ifdef CONFIG_PM_SLEEP
Dmitry Torokhovffd0db92009-09-16 01:06:43 -07001749 .pm = &input_dev_pm_ops,
1750#endif
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001751};
1752
Al Viro2c9ede52011-07-23 20:24:48 -04001753static char *input_devnode(struct device *dev, umode_t *mode)
Kay Sieversaa5ed632009-04-30 15:23:42 +02001754{
1755 return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev));
1756}
1757
Greg Kroah-Hartmanea9f2402005-10-27 22:25:43 -07001758struct class input_class = {
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001759 .name = "input",
Kay Sieverse454cea2009-09-18 23:01:12 +02001760 .devnode = input_devnode,
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001761};
Dmitry Torokhovca56fe02006-06-26 01:49:21 -04001762EXPORT_SYMBOL_GPL(input_class);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001763
Dmitry Torokhov14471902006-11-02 23:26:55 -05001764/**
1765 * input_allocate_device - allocate memory for new input device
1766 *
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07001767 * Returns prepared struct input_dev or %NULL.
Dmitry Torokhov14471902006-11-02 23:26:55 -05001768 *
1769 * NOTE: Use input_free_device() to free devices that have not been
1770 * registered; input_unregister_device() should be used for already
1771 * registered devices.
1772 */
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001773struct input_dev *input_allocate_device(void)
1774{
David Herrmanna60a71b2013-10-06 01:15:08 -07001775 static atomic_t input_no = ATOMIC_INIT(0);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001776 struct input_dev *dev;
1777
1778 dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
1779 if (dev) {
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001780 dev->dev.type = &input_dev_type;
1781 dev->dev.class = &input_class;
1782 device_initialize(&dev->dev);
Dmitry Torokhovf60d2b12006-06-26 01:48:36 -04001783 mutex_init(&dev->mutex);
Dmitry Torokhov80064792007-08-30 00:22:11 -04001784 spin_lock_init(&dev->event_lock);
David Herrmanna60a71b2013-10-06 01:15:08 -07001785 init_timer(&dev->timer);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001786 INIT_LIST_HEAD(&dev->h_list);
1787 INIT_LIST_HEAD(&dev->node);
Dmitry Torokhov655816e2006-09-14 01:32:14 -04001788
David Herrmanna60a71b2013-10-06 01:15:08 -07001789 dev_set_name(&dev->dev, "input%ld",
1790 (unsigned long) atomic_inc_return(&input_no) - 1);
1791
Dmitry Torokhov655816e2006-09-14 01:32:14 -04001792 __module_get(THIS_MODULE);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001793 }
1794
1795 return dev;
1796}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -04001797EXPORT_SYMBOL(input_allocate_device);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001798
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07001799struct input_devres {
1800 struct input_dev *input;
1801};
1802
1803static int devm_input_device_match(struct device *dev, void *res, void *data)
1804{
1805 struct input_devres *devres = res;
1806
1807 return devres->input == data;
1808}
1809
1810static void devm_input_device_release(struct device *dev, void *res)
1811{
1812 struct input_devres *devres = res;
1813 struct input_dev *input = devres->input;
1814
1815 dev_dbg(dev, "%s: dropping reference to %s\n",
1816 __func__, dev_name(&input->dev));
1817 input_put_device(input);
1818}
1819
1820/**
1821 * devm_input_allocate_device - allocate managed input device
1822 * @dev: device owning the input device being created
1823 *
1824 * Returns prepared struct input_dev or %NULL.
1825 *
1826 * Managed input devices do not need to be explicitly unregistered or
1827 * freed as it will be done automatically when owner device unbinds from
1828 * its driver (or binding fails). Once managed input device is allocated,
1829 * it is ready to be set up and registered in the same fashion as regular
1830 * input device. There are no special devm_input_device_[un]register()
Dmitry Torokhovb6662632013-01-08 09:10:31 -08001831 * variants, regular ones work with both managed and unmanaged devices,
1832 * should you need them. In most cases however, managed input device need
1833 * not be explicitly unregistered or freed.
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07001834 *
1835 * NOTE: the owner device is set up as parent of input device and users
1836 * should not override it.
1837 */
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07001838struct input_dev *devm_input_allocate_device(struct device *dev)
1839{
1840 struct input_dev *input;
1841 struct input_devres *devres;
1842
1843 devres = devres_alloc(devm_input_device_release,
1844 sizeof(struct input_devres), GFP_KERNEL);
1845 if (!devres)
1846 return NULL;
1847
1848 input = input_allocate_device();
1849 if (!input) {
1850 devres_free(devres);
1851 return NULL;
1852 }
1853
1854 input->dev.parent = dev;
1855 input->devres_managed = true;
1856
1857 devres->input = input;
1858 devres_add(dev, devres);
1859
1860 return input;
1861}
1862EXPORT_SYMBOL(devm_input_allocate_device);
1863
Dmitry Torokhov14471902006-11-02 23:26:55 -05001864/**
1865 * input_free_device - free memory occupied by input_dev structure
1866 * @dev: input device to free
1867 *
1868 * This function should only be used if input_register_device()
1869 * was not called yet or if it failed. Once device was registered
1870 * use input_unregister_device() and memory will be freed once last
Dmitry Torokhov80064792007-08-30 00:22:11 -04001871 * reference to the device is dropped.
Dmitry Torokhov14471902006-11-02 23:26:55 -05001872 *
1873 * Device should be allocated by input_allocate_device().
1874 *
1875 * NOTE: If there are references to the input device then memory
1876 * will not be freed until last reference is dropped.
1877 */
Dmitry Torokhovf60d2b12006-06-26 01:48:36 -04001878void input_free_device(struct input_dev *dev)
1879{
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07001880 if (dev) {
1881 if (dev->devres_managed)
1882 WARN_ON(devres_destroy(dev->dev.parent,
1883 devm_input_device_release,
1884 devm_input_device_match,
1885 dev));
Dmitry Torokhovf60d2b12006-06-26 01:48:36 -04001886 input_put_device(dev);
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07001887 }
Dmitry Torokhovf60d2b12006-06-26 01:48:36 -04001888}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -04001889EXPORT_SYMBOL(input_free_device);
Dmitry Torokhovf60d2b12006-06-26 01:48:36 -04001890
Dmitry Torokhov534565f2007-04-25 00:53:18 -04001891/**
1892 * input_set_capability - mark device as capable of a certain event
1893 * @dev: device that is capable of emitting or accepting event
1894 * @type: type of the event (EV_KEY, EV_REL, etc...)
1895 * @code: event code
1896 *
1897 * In addition to setting up corresponding bit in appropriate capability
1898 * bitmap the function also adjusts dev->evbit.
1899 */
1900void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
1901{
1902 switch (type) {
1903 case EV_KEY:
1904 __set_bit(code, dev->keybit);
1905 break;
1906
1907 case EV_REL:
1908 __set_bit(code, dev->relbit);
1909 break;
1910
1911 case EV_ABS:
Dmitry Torokhov28a2a2e2013-12-26 17:44:29 -08001912 input_alloc_absinfo(dev);
1913 if (!dev->absinfo)
1914 return;
1915
Dmitry Torokhov534565f2007-04-25 00:53:18 -04001916 __set_bit(code, dev->absbit);
1917 break;
1918
1919 case EV_MSC:
1920 __set_bit(code, dev->mscbit);
1921 break;
1922
1923 case EV_SW:
1924 __set_bit(code, dev->swbit);
1925 break;
1926
1927 case EV_LED:
1928 __set_bit(code, dev->ledbit);
1929 break;
1930
1931 case EV_SND:
1932 __set_bit(code, dev->sndbit);
1933 break;
1934
1935 case EV_FF:
1936 __set_bit(code, dev->ffbit);
1937 break;
1938
Dmitry Baryshkov22d1c392007-12-14 01:21:03 -05001939 case EV_PWR:
1940 /* do nothing */
1941 break;
1942
Dmitry Torokhov534565f2007-04-25 00:53:18 -04001943 default:
Joe Perchesda0c4902010-11-29 23:33:07 -08001944 pr_err("input_set_capability: unknown type %u (code %u)\n",
1945 type, code);
Dmitry Torokhov534565f2007-04-25 00:53:18 -04001946 dump_stack();
1947 return;
1948 }
1949
1950 __set_bit(type, dev->evbit);
1951}
1952EXPORT_SYMBOL(input_set_capability);
1953
Jeff Brown80b48952011-04-18 10:08:02 -07001954static unsigned int input_estimate_events_per_packet(struct input_dev *dev)
1955{
1956 int mt_slots;
1957 int i;
1958 unsigned int events;
1959
Henrik Rydberg8d18fba2012-09-15 15:15:58 +02001960 if (dev->mt) {
1961 mt_slots = dev->mt->num_slots;
Jeff Brown80b48952011-04-18 10:08:02 -07001962 } else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit)) {
1963 mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum -
1964 dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1,
Hans Petter Selasky8c127f02011-05-25 09:24:32 -07001965 mt_slots = clamp(mt_slots, 2, 32);
Jeff Brown80b48952011-04-18 10:08:02 -07001966 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
1967 mt_slots = 2;
1968 } else {
1969 mt_slots = 0;
1970 }
1971
1972 events = mt_slots + 1; /* count SYN_MT_REPORT and SYN_REPORT */
1973
1974 for (i = 0; i < ABS_CNT; i++) {
1975 if (test_bit(i, dev->absbit)) {
1976 if (input_is_mt_axis(i))
1977 events += mt_slots;
1978 else
1979 events++;
1980 }
1981 }
1982
1983 for (i = 0; i < REL_CNT; i++)
1984 if (test_bit(i, dev->relbit))
1985 events++;
1986
Henrik Rydberg7c75bf92012-09-01 16:15:43 +02001987 /* Make room for KEY and MSC events */
1988 events += 7;
1989
Jeff Brown80b48952011-04-18 10:08:02 -07001990 return events;
1991}
1992
Dmitry Torokhov92a3a582010-01-05 17:56:01 -08001993#define INPUT_CLEANSE_BITMASK(dev, type, bits) \
1994 do { \
1995 if (!test_bit(EV_##type, dev->evbit)) \
1996 memset(dev->bits##bit, 0, \
1997 sizeof(dev->bits##bit)); \
1998 } while (0)
1999
2000static void input_cleanse_bitmasks(struct input_dev *dev)
2001{
2002 INPUT_CLEANSE_BITMASK(dev, KEY, key);
2003 INPUT_CLEANSE_BITMASK(dev, REL, rel);
2004 INPUT_CLEANSE_BITMASK(dev, ABS, abs);
2005 INPUT_CLEANSE_BITMASK(dev, MSC, msc);
2006 INPUT_CLEANSE_BITMASK(dev, LED, led);
2007 INPUT_CLEANSE_BITMASK(dev, SND, snd);
2008 INPUT_CLEANSE_BITMASK(dev, FF, ff);
2009 INPUT_CLEANSE_BITMASK(dev, SW, sw);
2010}
2011
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07002012static void __input_unregister_device(struct input_dev *dev)
2013{
2014 struct input_handle *handle, *next;
2015
2016 input_disconnect_device(dev);
2017
2018 mutex_lock(&input_mutex);
2019
2020 list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
2021 handle->handler->disconnect(handle);
2022 WARN_ON(!list_empty(&dev->h_list));
2023
2024 del_timer_sync(&dev->timer);
2025 list_del_init(&dev->node);
2026
2027 input_wakeup_procfs_readers();
2028
2029 mutex_unlock(&input_mutex);
2030
2031 device_del(&dev->dev);
2032}
2033
2034static void devm_input_device_unregister(struct device *dev, void *res)
2035{
2036 struct input_devres *devres = res;
2037 struct input_dev *input = devres->input;
2038
2039 dev_dbg(dev, "%s: unregistering device %s\n",
2040 __func__, dev_name(&input->dev));
2041 __input_unregister_device(input);
2042}
2043
Dmitry Torokhov80064792007-08-30 00:22:11 -04002044/**
2045 * input_register_device - register device with input core
2046 * @dev: device to be registered
2047 *
2048 * This function registers device with input core. The device must be
2049 * allocated with input_allocate_device() and all it's capabilities
2050 * set up before registering.
2051 * If function fails the device must be freed with input_free_device().
2052 * Once device has been successfully registered it can be unregistered
2053 * with input_unregister_device(); input_free_device() should not be
2054 * called in this case.
Dmitry Torokhovb6662632013-01-08 09:10:31 -08002055 *
2056 * Note that this function is also used to register managed input devices
2057 * (ones allocated with devm_input_allocate_device()). Such managed input
2058 * devices need not be explicitly unregistered or freed, their tear down
2059 * is controlled by the devres infrastructure. It is also worth noting
2060 * that tear down of managed input devices is internally a 2-step process:
2061 * registered managed input device is first unregistered, but stays in
2062 * memory and can still handle input_event() calls (although events will
2063 * not be delivered anywhere). The freeing of managed input device will
2064 * happen later, when devres stack is unwound to the point where device
2065 * allocation was made.
Dmitry Torokhov80064792007-08-30 00:22:11 -04002066 */
Dmitry Torokhov5f945482005-11-02 22:51:46 -05002067int input_register_device(struct input_dev *dev)
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002068{
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07002069 struct input_devres *devres = NULL;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002070 struct input_handler *handler;
Henrik Rydberg7c75bf92012-09-01 16:15:43 +02002071 unsigned int packet_size;
Dmitry Torokhovbd0ef232005-11-20 00:56:31 -05002072 const char *path;
2073 int error;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002074
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07002075 if (dev->devres_managed) {
2076 devres = devres_alloc(devm_input_device_unregister,
2077 sizeof(struct input_devres), GFP_KERNEL);
2078 if (!devres)
2079 return -ENOMEM;
2080
2081 devres->input = dev;
2082 }
2083
Dmitry Torokhov4f93df42010-01-05 17:56:00 -08002084 /* Every input device generates EV_SYN/SYN_REPORT events. */
Dmitry Torokhov80064792007-08-30 00:22:11 -04002085 __set_bit(EV_SYN, dev->evbit);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002086
Dmitry Torokhov4f93df42010-01-05 17:56:00 -08002087 /* KEY_RESERVED is not supposed to be transmitted to userspace. */
2088 __clear_bit(KEY_RESERVED, dev->keybit);
2089
Dmitry Torokhov92a3a582010-01-05 17:56:01 -08002090 /* Make sure that bitmasks not mentioned in dev->evbit are clean. */
2091 input_cleanse_bitmasks(dev);
2092
Henrik Rydberg7c75bf92012-09-01 16:15:43 +02002093 packet_size = input_estimate_events_per_packet(dev);
2094 if (dev->hint_events_per_packet < packet_size)
2095 dev->hint_events_per_packet = packet_size;
Jeff Brown80b48952011-04-18 10:08:02 -07002096
Kang Hu95079b82013-10-31 00:47:53 -07002097 dev->max_vals = dev->hint_events_per_packet + 2;
Henrik Rydberg4369c642012-09-15 15:23:35 +02002098 dev->vals = kcalloc(dev->max_vals, sizeof(*dev->vals), GFP_KERNEL);
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07002099 if (!dev->vals) {
2100 error = -ENOMEM;
2101 goto err_devres_free;
2102 }
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002103
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002104 /*
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002105 * If delay and period are pre-set by the driver, then autorepeating
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002106 * is handled by the driver itself and we don't do it in input.c.
Dmitry Torokhov5f945482005-11-02 22:51:46 -05002107 */
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002108 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002109 dev->timer.data = (long) dev;
Dmitry Torokhov80064792007-08-30 00:22:11 -04002110 dev->timer.function = input_repeat_key;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002111 dev->rep[REP_DELAY] = 250;
Dmitry Torokhov80064792007-08-30 00:22:11 -04002112 dev->rep[REP_PERIOD] = 33;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002113 }
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002114
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002115 if (!dev->getkeycode)
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002116 dev->getkeycode = input_default_getkeycode;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002117
Dmitry Torokhov80064792007-08-30 00:22:11 -04002118 if (!dev->setkeycode)
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002119 dev->setkeycode = input_default_setkeycode;
2120
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002121 error = device_add(&dev->dev);
2122 if (error)
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07002123 goto err_free_vals;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002124
2125 path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
2126 pr_info("%s as %s\n",
2127 dev->name ? dev->name : "Unspecified device",
2128 path ? path : "N/A");
2129 kfree(path);
2130
2131 error = mutex_lock_interruptible(&input_mutex);
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07002132 if (error)
2133 goto err_device_del;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002134
2135 list_add_tail(&dev->node, &input_dev_list);
2136
2137 list_for_each_entry(handler, &input_handler_list, node)
2138 input_attach_handler(dev, handler);
2139
2140 input_wakeup_procfs_readers();
2141
2142 mutex_unlock(&input_mutex);
2143
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07002144 if (dev->devres_managed) {
2145 dev_dbg(dev->dev.parent, "%s: registering %s with devres.\n",
2146 __func__, dev_name(&dev->dev));
2147 devres_add(dev->dev.parent, devres);
2148 }
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002149 return 0;
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07002150
2151err_device_del:
2152 device_del(&dev->dev);
2153err_free_vals:
2154 kfree(dev->vals);
2155 dev->vals = NULL;
2156err_devres_free:
2157 devres_free(devres);
2158 return error;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002159}
2160EXPORT_SYMBOL(input_register_device);
2161
2162/**
2163 * input_unregister_device - unregister previously registered device
2164 * @dev: device to be unregistered
2165 *
2166 * This function unregisters an input device. Once device is unregistered
2167 * the caller should not try to access it as it may get freed at any moment.
2168 */
2169void input_unregister_device(struct input_dev *dev)
2170{
Dmitry Torokhov2be975c2012-11-03 12:16:12 -07002171 if (dev->devres_managed) {
2172 WARN_ON(devres_destroy(dev->dev.parent,
2173 devm_input_device_unregister,
2174 devm_input_device_match,
2175 dev));
2176 __input_unregister_device(dev);
2177 /*
2178 * We do not do input_put_device() here because it will be done
2179 * when 2nd devres fires up.
2180 */
2181 } else {
2182 __input_unregister_device(dev);
2183 input_put_device(dev);
2184 }
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002185}
2186EXPORT_SYMBOL(input_unregister_device);
2187
Dmitry Torokhov80064792007-08-30 00:22:11 -04002188/**
2189 * input_register_handler - register a new input handler
2190 * @handler: handler to be registered
2191 *
2192 * This function registers a new input handler (interface) for input
2193 * devices in the system and attaches it to all input devices that
2194 * are compatible with the handler.
2195 */
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002196int input_register_handler(struct input_handler *handler)
2197{
2198 struct input_dev *dev;
Dmitry Torokhov7f8d4ca2012-10-08 09:07:24 -07002199 int error;
Dmitry Torokhov80064792007-08-30 00:22:11 -04002200
Dmitry Torokhov7f8d4ca2012-10-08 09:07:24 -07002201 error = mutex_lock_interruptible(&input_mutex);
2202 if (error)
2203 return error;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002204
2205 INIT_LIST_HEAD(&handler->h_list);
2206
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002207 list_add_tail(&handler->node, &input_handler_list);
2208
2209 list_for_each_entry(dev, &input_dev_list, node)
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002210 input_attach_handler(dev, handler);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002211
2212 input_wakeup_procfs_readers();
Dmitry Torokhov80064792007-08-30 00:22:11 -04002213
Dmitry Torokhov80064792007-08-30 00:22:11 -04002214 mutex_unlock(&input_mutex);
Dmitry Torokhov7f8d4ca2012-10-08 09:07:24 -07002215 return 0;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002216}
2217EXPORT_SYMBOL(input_register_handler);
2218
Dmitry Torokhov80064792007-08-30 00:22:11 -04002219/**
2220 * input_unregister_handler - unregisters an input handler
2221 * @handler: handler to be unregistered
2222 *
2223 * This function disconnects a handler from its input devices and
2224 * removes it from lists of known handlers.
2225 */
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002226void input_unregister_handler(struct input_handler *handler)
2227{
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002228 struct input_handle *handle, *next;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002229
Dmitry Torokhov80064792007-08-30 00:22:11 -04002230 mutex_lock(&input_mutex);
2231
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002232 list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002233 handler->disconnect(handle);
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002234 WARN_ON(!list_empty(&handler->h_list));
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002235
2236 list_del_init(&handler->node);
2237
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002238 input_wakeup_procfs_readers();
Dmitry Torokhov80064792007-08-30 00:22:11 -04002239
2240 mutex_unlock(&input_mutex);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002241}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -04002242EXPORT_SYMBOL(input_unregister_handler);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002243
Dmitry Torokhov80064792007-08-30 00:22:11 -04002244/**
Dmitry Torokhov66d2a592009-12-01 21:54:35 -08002245 * input_handler_for_each_handle - handle iterator
2246 * @handler: input handler to iterate
2247 * @data: data for the callback
2248 * @fn: function to be called for each handle
2249 *
2250 * Iterate over @bus's list of devices, and call @fn for each, passing
2251 * it @data and stop when @fn returns a non-zero value. The function is
2252 * using RCU to traverse the list and therefore may be usind in atonic
2253 * contexts. The @fn callback is invoked from RCU critical section and
2254 * thus must not sleep.
2255 */
2256int input_handler_for_each_handle(struct input_handler *handler, void *data,
2257 int (*fn)(struct input_handle *, void *))
2258{
2259 struct input_handle *handle;
2260 int retval = 0;
2261
2262 rcu_read_lock();
2263
2264 list_for_each_entry_rcu(handle, &handler->h_list, h_node) {
2265 retval = fn(handle, data);
2266 if (retval)
2267 break;
2268 }
2269
2270 rcu_read_unlock();
2271
2272 return retval;
2273}
2274EXPORT_SYMBOL(input_handler_for_each_handle);
2275
2276/**
Dmitry Torokhov80064792007-08-30 00:22:11 -04002277 * input_register_handle - register a new input handle
2278 * @handle: handle to register
2279 *
2280 * This function puts a new input handle onto device's
2281 * and handler's lists so that events can flow through
2282 * it once it is opened using input_open_device().
2283 *
2284 * This function is supposed to be called from handler's
2285 * connect() method.
2286 */
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002287int input_register_handle(struct input_handle *handle)
2288{
2289 struct input_handler *handler = handle->handler;
Dmitry Torokhov80064792007-08-30 00:22:11 -04002290 struct input_dev *dev = handle->dev;
2291 int error;
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002292
Dmitry Torokhov80064792007-08-30 00:22:11 -04002293 /*
2294 * We take dev->mutex here to prevent race with
2295 * input_release_device().
2296 */
2297 error = mutex_lock_interruptible(&dev->mutex);
2298 if (error)
2299 return error;
Dmitry Torokhovef7995f2010-01-29 23:59:12 -08002300
2301 /*
2302 * Filters go to the head of the list, normal handlers
2303 * to the tail.
2304 */
2305 if (handler->filter)
2306 list_add_rcu(&handle->d_node, &dev->h_list);
2307 else
2308 list_add_tail_rcu(&handle->d_node, &dev->h_list);
2309
Dmitry Torokhov80064792007-08-30 00:22:11 -04002310 mutex_unlock(&dev->mutex);
Dmitry Torokhov80064792007-08-30 00:22:11 -04002311
2312 /*
2313 * Since we are supposed to be called from ->connect()
2314 * which is mutually exclusive with ->disconnect()
2315 * we can't be racing with input_unregister_handle()
2316 * and so separate lock is not needed here.
2317 */
Dmitry Torokhov66d2a592009-12-01 21:54:35 -08002318 list_add_tail_rcu(&handle->h_node, &handler->h_list);
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002319
2320 if (handler->start)
2321 handler->start(handle);
2322
2323 return 0;
2324}
2325EXPORT_SYMBOL(input_register_handle);
2326
Dmitry Torokhov80064792007-08-30 00:22:11 -04002327/**
2328 * input_unregister_handle - unregister an input handle
2329 * @handle: handle to unregister
2330 *
2331 * This function removes input handle from device's
2332 * and handler's lists.
2333 *
2334 * This function is supposed to be called from handler's
2335 * disconnect() method.
2336 */
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002337void input_unregister_handle(struct input_handle *handle)
2338{
Dmitry Torokhov80064792007-08-30 00:22:11 -04002339 struct input_dev *dev = handle->dev;
2340
Dmitry Torokhov66d2a592009-12-01 21:54:35 -08002341 list_del_rcu(&handle->h_node);
Dmitry Torokhov80064792007-08-30 00:22:11 -04002342
2343 /*
2344 * Take dev->mutex to prevent race with input_release_device().
2345 */
2346 mutex_lock(&dev->mutex);
2347 list_del_rcu(&handle->d_node);
2348 mutex_unlock(&dev->mutex);
Dmitry Torokhov66d2a592009-12-01 21:54:35 -08002349
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -04002350 synchronize_rcu();
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04002351}
2352EXPORT_SYMBOL(input_unregister_handle);
2353
Dmitry Torokhov7f8d4ca2012-10-08 09:07:24 -07002354/**
2355 * input_get_new_minor - allocates a new input minor number
2356 * @legacy_base: beginning or the legacy range to be searched
2357 * @legacy_num: size of legacy range
2358 * @allow_dynamic: whether we can also take ID from the dynamic range
2359 *
2360 * This function allocates a new device minor for from input major namespace.
2361 * Caller can request legacy minor by specifying @legacy_base and @legacy_num
2362 * parameters and whether ID can be allocated from dynamic range if there are
2363 * no free IDs in legacy range.
2364 */
2365int input_get_new_minor(int legacy_base, unsigned int legacy_num,
2366 bool allow_dynamic)
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002367{
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002368 /*
Dmitry Torokhov7f8d4ca2012-10-08 09:07:24 -07002369 * This function should be called from input handler's ->connect()
2370 * methods, which are serialized with input_mutex, so no additional
2371 * locking is needed here.
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002372 */
Dmitry Torokhov7f8d4ca2012-10-08 09:07:24 -07002373 if (legacy_base >= 0) {
2374 int minor = ida_simple_get(&input_ida,
2375 legacy_base,
2376 legacy_base + legacy_num,
2377 GFP_KERNEL);
2378 if (minor >= 0 || !allow_dynamic)
2379 return minor;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002380 }
Arnd Bergmann2f2177c2010-03-09 20:38:48 -08002381
Dmitry Torokhov7f8d4ca2012-10-08 09:07:24 -07002382 return ida_simple_get(&input_ida,
2383 INPUT_FIRST_DYNAMIC_DEV, INPUT_MAX_CHAR_DEVICES,
2384 GFP_KERNEL);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002385}
Dmitry Torokhov7f8d4ca2012-10-08 09:07:24 -07002386EXPORT_SYMBOL(input_get_new_minor);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002387
Dmitry Torokhov7f8d4ca2012-10-08 09:07:24 -07002388/**
2389 * input_free_minor - release previously allocated minor
2390 * @minor: minor to be released
2391 *
2392 * This function releases previously allocated input minor so that it can be
2393 * reused later.
2394 */
2395void input_free_minor(unsigned int minor)
2396{
2397 ida_simple_remove(&input_ida, minor);
2398}
2399EXPORT_SYMBOL(input_free_minor);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002400
Linus Torvalds1da177e2005-04-16 15:20:36 -07002401static int __init input_init(void)
2402{
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002403 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002404
Greg Kroah-Hartmanea9f2402005-10-27 22:25:43 -07002405 err = class_register(&input_class);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05002406 if (err) {
Joe Perchesda0c4902010-11-29 23:33:07 -08002407 pr_err("unable to register input_dev class\n");
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05002408 return err;
2409 }
2410
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002411 err = input_proc_init();
2412 if (err)
Greg Kroah-Hartmanb0fdfeb2005-10-27 22:25:43 -07002413 goto fail1;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002414
Dmitry Torokhov7f8d4ca2012-10-08 09:07:24 -07002415 err = register_chrdev_region(MKDEV(INPUT_MAJOR, 0),
2416 INPUT_MAX_CHAR_DEVICES, "input");
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002417 if (err) {
Joe Perchesda0c4902010-11-29 23:33:07 -08002418 pr_err("unable to register char major %d", INPUT_MAJOR);
Greg Kroah-Hartmanb0fdfeb2005-10-27 22:25:43 -07002419 goto fail2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002420 }
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002421
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002422 return 0;
2423
Greg Kroah-Hartmanb0fdfeb2005-10-27 22:25:43 -07002424 fail2: input_proc_exit();
Greg Kroah-Hartmanea9f2402005-10-27 22:25:43 -07002425 fail1: class_unregister(&input_class);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002426 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002427}
2428
2429static void __exit input_exit(void)
2430{
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002431 input_proc_exit();
Dmitry Torokhov7f8d4ca2012-10-08 09:07:24 -07002432 unregister_chrdev_region(MKDEV(INPUT_MAJOR, 0),
2433 INPUT_MAX_CHAR_DEVICES);
Greg Kroah-Hartmanea9f2402005-10-27 22:25:43 -07002434 class_unregister(&input_class);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002435}
2436
2437subsys_initcall(input_init);
2438module_exit(input_exit);