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Input: add generic support for sparse keymaps

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More and more devices choose to reimplement support for sparse keymaps
first introduced by wistron driver. Move it into a library module so it
can be easily used by interested parties.

Reviewed-by: Anisse Astier <anisse@astier.eu>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Dmitry Torokhov
2009-12-04 10:22:23 -08:00
parent 6a47081c37
commit 36203c4f3d
6 changed files with 347 additions and 12 deletions
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250
drivers/input/sparse-keymap.c Normal file
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/*
* 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>
*
* 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.
*/
#include <linux/input.h>
#include <linux/input/sparse-keymap.h>
MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
MODULE_DESCRIPTION("Generic support for sparse keymaps");
MODULE_LICENSE("GPL v2");
MODULE_VERSION("0.1");
/**
* 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 int sparse_keymap_getkeycode(struct input_dev *dev,
int scancode, int *keycode)
{
const struct key_entry *key =
sparse_keymap_entry_from_scancode(dev, scancode);
if (key && key->type == KE_KEY) {
*keycode = key->keycode;
return 0;
}
return -EINVAL;
}
static int sparse_keymap_setkeycode(struct input_dev *dev,
int scancode, int keycode)
{
struct key_entry *key;
int old_keycode;
if (keycode < 0 || keycode > KEY_MAX)
return -EINVAL;
key = sparse_keymap_entry_from_scancode(dev, scancode);
if (key && key->type == KE_KEY) {
old_keycode = key->keycode;
key->keycode = keycode;
set_bit(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 deeds, may be %NULL
*
* The function calculates size and allocates copy of the original
* keymap after which sets up input device event bits appropriately.
* Before destroying input device allocated keymap should be freed
* with a call to sparse_keymap_free().
*/
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 = kcalloc(map_size, sizeof (struct key_entry), GFP_KERNEL);
if (!map)
return -ENOMEM;
memcpy(map, keymap, map_size * sizeof (struct key_entry));
for (i = 0; i < map_size; i++) {
entry = &map[i];
if (setup) {
error = setup(dev, entry);
if (error)
goto err_out;
}
switch (entry->type) {
case KE_KEY:
__set_bit(EV_KEY, dev->evbit);
__set_bit(entry->keycode, dev->keybit);
break;
case KE_SW:
__set_bit(EV_SW, dev->evbit);
__set_bit(entry->sw.code, dev->swbit);
break;
}
}
dev->keycode = map;
dev->keycodemax = map_size;
dev->getkeycode = sparse_keymap_getkeycode;
dev->setkeycode = sparse_keymap_setkeycode;
return 0;
err_out:
kfree(keymap);
return error;
}
EXPORT_SYMBOL(sparse_keymap_setup);
/**
* sparse_keymap_free - free memory allocated for sparse keymap
* @dev: Input device using sparse keymap
*
* This function is used to free memory allocated by sparse keymap
* in an input device that was set up by sparse_keymap_setup().
*/
void sparse_keymap_free(struct input_dev *dev)
{
kfree(dev->keycode);
dev->keycode = NULL;
dev->keycodemax = 0;
dev->getkeycode = NULL;
dev->setkeycode = NULL;
}
EXPORT_SYMBOL(sparse_keymap_free);
/**
* 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_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);
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);
if (ke) {
sparse_keymap_report_entry(dev, ke, value, autorelease);
return true;
}
return false;
}
EXPORT_SYMBOL(sparse_keymap_report_event);