mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 02:39:48 +00:00
![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
294 lines
7.4 KiB
C
294 lines
7.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Generic support for sparse keymaps
|
|
*
|
|
* Copyright (c) 2009 Dmitry Torokhov
|
|
*
|
|
* Derived from wistron button driver:
|
|
* Copyright (C) 2005 Miloslav Trmac <mitr@volny.cz>
|
|
* Copyright (C) 2005 Bernhard Rosenkraenzer <bero@arklinux.org>
|
|
* Copyright (C) 2005 Dmitry Torokhov <dtor@mail.ru>
|
|
*/
|
|
|
|
#include <linux/input.h>
|
|
#include <linux/input/sparse-keymap.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
|
|
MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
|
|
MODULE_DESCRIPTION("Generic support for sparse keymaps");
|
|
MODULE_LICENSE("GPL v2");
|
|
|
|
static unsigned int sparse_keymap_get_key_index(struct input_dev *dev,
|
|
const struct key_entry *k)
|
|
{
|
|
struct key_entry *key;
|
|
unsigned int idx = 0;
|
|
|
|
for (key = dev->keycode; key->type != KE_END; key++) {
|
|
if (key->type == KE_KEY) {
|
|
if (key == k)
|
|
break;
|
|
idx++;
|
|
}
|
|
}
|
|
|
|
return idx;
|
|
}
|
|
|
|
static struct key_entry *sparse_keymap_entry_by_index(struct input_dev *dev,
|
|
unsigned int index)
|
|
{
|
|
struct key_entry *key;
|
|
unsigned int key_cnt = 0;
|
|
|
|
for (key = dev->keycode; key->type != KE_END; key++)
|
|
if (key->type == KE_KEY)
|
|
if (key_cnt++ == index)
|
|
return key;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* sparse_keymap_entry_from_scancode - perform sparse keymap lookup
|
|
* @dev: Input device using sparse keymap
|
|
* @code: Scan code
|
|
*
|
|
* This function is used to perform &struct key_entry lookup in an
|
|
* input device using sparse keymap.
|
|
*/
|
|
struct key_entry *sparse_keymap_entry_from_scancode(struct input_dev *dev,
|
|
unsigned int code)
|
|
{
|
|
struct key_entry *key;
|
|
|
|
for (key = dev->keycode; key->type != KE_END; key++)
|
|
if (code == key->code)
|
|
return key;
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(sparse_keymap_entry_from_scancode);
|
|
|
|
/**
|
|
* sparse_keymap_entry_from_keycode - perform sparse keymap lookup
|
|
* @dev: Input device using sparse keymap
|
|
* @keycode: Key code
|
|
*
|
|
* This function is used to perform &struct key_entry lookup in an
|
|
* input device using sparse keymap.
|
|
*/
|
|
struct key_entry *sparse_keymap_entry_from_keycode(struct input_dev *dev,
|
|
unsigned int keycode)
|
|
{
|
|
struct key_entry *key;
|
|
|
|
for (key = dev->keycode; key->type != KE_END; key++)
|
|
if (key->type == KE_KEY && keycode == key->keycode)
|
|
return key;
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(sparse_keymap_entry_from_keycode);
|
|
|
|
static struct key_entry *sparse_keymap_locate(struct input_dev *dev,
|
|
const struct input_keymap_entry *ke)
|
|
{
|
|
struct key_entry *key;
|
|
unsigned int scancode;
|
|
|
|
if (ke->flags & INPUT_KEYMAP_BY_INDEX)
|
|
key = sparse_keymap_entry_by_index(dev, ke->index);
|
|
else if (input_scancode_to_scalar(ke, &scancode) == 0)
|
|
key = sparse_keymap_entry_from_scancode(dev, scancode);
|
|
else
|
|
key = NULL;
|
|
|
|
return key;
|
|
}
|
|
|
|
static int sparse_keymap_getkeycode(struct input_dev *dev,
|
|
struct input_keymap_entry *ke)
|
|
{
|
|
const struct key_entry *key;
|
|
|
|
if (dev->keycode) {
|
|
key = sparse_keymap_locate(dev, ke);
|
|
if (key && key->type == KE_KEY) {
|
|
ke->keycode = key->keycode;
|
|
if (!(ke->flags & INPUT_KEYMAP_BY_INDEX))
|
|
ke->index =
|
|
sparse_keymap_get_key_index(dev, key);
|
|
ke->len = sizeof(key->code);
|
|
memcpy(ke->scancode, &key->code, sizeof(key->code));
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int sparse_keymap_setkeycode(struct input_dev *dev,
|
|
const struct input_keymap_entry *ke,
|
|
unsigned int *old_keycode)
|
|
{
|
|
struct key_entry *key;
|
|
|
|
if (dev->keycode) {
|
|
key = sparse_keymap_locate(dev, ke);
|
|
if (key && key->type == KE_KEY) {
|
|
*old_keycode = key->keycode;
|
|
key->keycode = ke->keycode;
|
|
set_bit(ke->keycode, dev->keybit);
|
|
if (!sparse_keymap_entry_from_keycode(dev, *old_keycode))
|
|
clear_bit(*old_keycode, dev->keybit);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
/**
|
|
* sparse_keymap_setup - set up sparse keymap for an input device
|
|
* @dev: Input device
|
|
* @keymap: Keymap in form of array of &key_entry structures ending
|
|
* with %KE_END type entry
|
|
* @setup: Function that can be used to adjust keymap entries
|
|
* depending on device's needs, may be %NULL
|
|
*
|
|
* The function calculates size and allocates copy of the original
|
|
* keymap after which sets up input device event bits appropriately.
|
|
* The allocated copy of the keymap is automatically freed when it
|
|
* is no longer needed.
|
|
*/
|
|
int sparse_keymap_setup(struct input_dev *dev,
|
|
const struct key_entry *keymap,
|
|
int (*setup)(struct input_dev *, struct key_entry *))
|
|
{
|
|
size_t map_size = 1; /* to account for the last KE_END entry */
|
|
const struct key_entry *e;
|
|
struct key_entry *map, *entry;
|
|
int i;
|
|
int error;
|
|
|
|
for (e = keymap; e->type != KE_END; e++)
|
|
map_size++;
|
|
|
|
map = devm_kmemdup(&dev->dev, keymap, map_size * sizeof(*map),
|
|
GFP_KERNEL);
|
|
if (!map)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < map_size; i++) {
|
|
entry = &map[i];
|
|
|
|
if (setup) {
|
|
error = setup(dev, entry);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
switch (entry->type) {
|
|
case KE_KEY:
|
|
__set_bit(EV_KEY, dev->evbit);
|
|
__set_bit(entry->keycode, dev->keybit);
|
|
break;
|
|
|
|
case KE_SW:
|
|
case KE_VSW:
|
|
__set_bit(EV_SW, dev->evbit);
|
|
__set_bit(entry->sw.code, dev->swbit);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (test_bit(EV_KEY, dev->evbit)) {
|
|
__set_bit(KEY_UNKNOWN, dev->keybit);
|
|
__set_bit(EV_MSC, dev->evbit);
|
|
__set_bit(MSC_SCAN, dev->mscbit);
|
|
}
|
|
|
|
dev->keycode = map;
|
|
dev->keycodemax = map_size;
|
|
dev->getkeycode = sparse_keymap_getkeycode;
|
|
dev->setkeycode = sparse_keymap_setkeycode;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(sparse_keymap_setup);
|
|
|
|
/**
|
|
* sparse_keymap_report_entry - report event corresponding to given key entry
|
|
* @dev: Input device for which event should be reported
|
|
* @ke: key entry describing event
|
|
* @value: Value that should be reported (ignored by %KE_SW entries)
|
|
* @autorelease: Signals whether release event should be emitted for %KE_KEY
|
|
* entries right after reporting press event, ignored by all other
|
|
* entries
|
|
*
|
|
* This function is used to report input event described by given
|
|
* &struct key_entry.
|
|
*/
|
|
void sparse_keymap_report_entry(struct input_dev *dev, const struct key_entry *ke,
|
|
unsigned int value, bool autorelease)
|
|
{
|
|
switch (ke->type) {
|
|
case KE_KEY:
|
|
input_event(dev, EV_MSC, MSC_SCAN, ke->code);
|
|
input_report_key(dev, ke->keycode, value);
|
|
input_sync(dev);
|
|
if (value && autorelease) {
|
|
input_report_key(dev, ke->keycode, 0);
|
|
input_sync(dev);
|
|
}
|
|
break;
|
|
|
|
case KE_SW:
|
|
value = ke->sw.value;
|
|
/* fall through */
|
|
|
|
case KE_VSW:
|
|
input_report_switch(dev, ke->sw.code, value);
|
|
input_sync(dev);
|
|
break;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(sparse_keymap_report_entry);
|
|
|
|
/**
|
|
* sparse_keymap_report_event - report event corresponding to given scancode
|
|
* @dev: Input device using sparse keymap
|
|
* @code: Scan code
|
|
* @value: Value that should be reported (ignored by %KE_SW entries)
|
|
* @autorelease: Signals whether release event should be emitted for %KE_KEY
|
|
* entries right after reporting press event, ignored by all other
|
|
* entries
|
|
*
|
|
* This function is used to perform lookup in an input device using sparse
|
|
* keymap and report corresponding event. Returns %true if lookup was
|
|
* successful and %false otherwise.
|
|
*/
|
|
bool sparse_keymap_report_event(struct input_dev *dev, unsigned int code,
|
|
unsigned int value, bool autorelease)
|
|
{
|
|
const struct key_entry *ke =
|
|
sparse_keymap_entry_from_scancode(dev, code);
|
|
struct key_entry unknown_ke;
|
|
|
|
if (ke) {
|
|
sparse_keymap_report_entry(dev, ke, value, autorelease);
|
|
return true;
|
|
}
|
|
|
|
/* Report an unknown key event as a debugging aid */
|
|
unknown_ke.type = KE_KEY;
|
|
unknown_ke.code = code;
|
|
unknown_ke.keycode = KEY_UNKNOWN;
|
|
sparse_keymap_report_entry(dev, &unknown_ke, value, true);
|
|
|
|
return false;
|
|
}
|
|
EXPORT_SYMBOL(sparse_keymap_report_event);
|
|
|