linux-imx

/*

 * 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>

#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.

 */