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/*

 * Copyright (C) 2006 Jakub Jermar

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright

 *   notice, this list of conditions and the following disclaimer in the

 *   documentation and/or other materials provided with the distribution.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/** @addtogroup genarch

 * @{

 */

/**

 * @file

 * @brief   Key processing.

 */

#include <genarch/kbd/key.h>

#include <genarch/kbd/scanc.h>

#include <genarch/kbd/scanc_pc.h>

#include <synch/spinlock.h>

#include <console/chardev.h>

#include <typedefs.h>

#include <macros.h>

#define PRESSED_SHIFT       (1<<0)

#define PRESSED_CAPSLOCK    (1<<1)

#define LOCKED_CAPSLOCK     (1<<0)

#define ACTIVE_READ_BUFF_SIZE 16    /* Must be power of 2 */

static uint8_t active_read_buff[ACTIVE_READ_BUFF_SIZE];

SPINLOCK_INITIALIZE(keylock);       /**< keylock protects keyflags and lockflags. */

static volatile int keyflags;       /**< Tracking of multiple keypresses. */

static volatile int lockflags;      /**< Tracking of multiple keys lockings. */

/** Process release of key.

 *

 * @param sc Scancode of the key being released.

 */

void key_released(uint8_t sc)

{

    spinlock_lock(&keylock);

    switch (sc) {

        case SC_LSHIFT:

        case SC_RSHIFT:

        keyflags &= ~PRESSED_SHIFT;

        break;

        case SC_CAPSLOCK:

        keyflags &= ~PRESSED_CAPSLOCK;

        if (lockflags & LOCKED_CAPSLOCK)

            lockflags &= ~LOCKED_CAPSLOCK;

        else

            lockflags |= LOCKED_CAPSLOCK;

        break;

        default:

        break;

    }

    spinlock_unlock(&keylock);

}

/** Process keypress.

 *

 * @param sc Scancode of the key being pressed.

 */

void key_pressed(uint8_t sc)

{

    char *map = sc_primary_map;

    char ascii = sc_primary_map[sc];

    bool shift, capslock;

    bool letter = false;

    spinlock_lock(&keylock);

    switch (sc) {

    case SC_LSHIFT:

    case SC_RSHIFT:

            keyflags |= PRESSED_SHIFT;

        break;

    case SC_CAPSLOCK:

        keyflags |= PRESSED_CAPSLOCK;

        break;

    case SC_SPEC_ESCAPE:

        break;

    case SC_LEFTARR:

        chardev_push_character(&kbrd, 0x1b);

        chardev_push_character(&kbrd, 0x5b);

        chardev_push_character(&kbrd, 0x44);

        break;

    case SC_RIGHTARR:

        chardev_push_character(&kbrd, 0x1b);

        chardev_push_character(&kbrd, 0x5b);

        chardev_push_character(&kbrd, 0x43);

        break;

    case SC_UPARR:

        chardev_push_character(&kbrd, 0x1b);

        chardev_push_character(&kbrd, 0x5b);

        chardev_push_character(&kbrd, 0x41);

        break;

    case SC_DOWNARR:

        chardev_push_character(&kbrd, 0x1b);

        chardev_push_character(&kbrd, 0x5b);

        chardev_push_character(&kbrd, 0x42);

        break;

    case SC_HOME:

        chardev_push_character(&kbrd, 0x1b);

        chardev_push_character(&kbrd, 0x4f);

        chardev_push_character(&kbrd, 0x48);

        break;

    case SC_END:

        chardev_push_character(&kbrd, 0x1b);

        chardev_push_character(&kbrd, 0x4f);

        chardev_push_character(&kbrd, 0x46);

        break;

    case SC_DELETE:

        chardev_push_character(&kbrd, 0x1b);

        chardev_push_character(&kbrd, 0x5b);

        chardev_push_character(&kbrd, 0x33);

        chardev_push_character(&kbrd, 0x7e);

        break;

    default:

            letter = is_lower(ascii);

        capslock = (keyflags & PRESSED_CAPSLOCK) || (lockflags & LOCKED_CAPSLOCK);

        shift = keyflags & PRESSED_SHIFT;

        if (letter && capslock)

            shift = !shift;

        if (shift)

            map = sc_secondary_map;

        chardev_push_character(&kbrd, map[sc]);

        break;

    }

    spinlock_unlock(&keylock);

}

uint8_t active_read_buff_read(void)

{

    static int i=0;

    i &= (ACTIVE_READ_BUFF_SIZE-1);

    if(!active_read_buff[i]) {

        return 0;

    }

    return active_read_buff[i++];

}

void active_read_buff_write(uint8_t ch)

{

    static int i=0;

    active_read_buff[i] = ch;

    i++;

    i &= (ACTIVE_READ_BUFF_SIZE-1);

    active_read_buff[i]=0;

}

void active_read_key_pressed(uint8_t sc)

{

    char *map = sc_primary_map;

    char ascii = sc_primary_map[sc];

    bool shift, capslock;

    bool letter = false;

    /*spinlock_lock(&keylock);*/

    switch (sc) {

    case SC_LSHIFT:

    case SC_RSHIFT:

            keyflags |= PRESSED_SHIFT;

        break;

    case SC_CAPSLOCK:

        keyflags |= PRESSED_CAPSLOCK;

        break;

    case SC_SPEC_ESCAPE:

        break;

    case SC_LEFTARR:

        active_read_buff_write(0x1b);

        active_read_buff_write(0x5b);

        active_read_buff_write(0x44);

        break;

    case SC_RIGHTARR:

        active_read_buff_write(0x1b);

        active_read_buff_write(0x5b);

        active_read_buff_write(0x43);

        break;

    case SC_UPARR:

        active_read_buff_write(0x1b);

        active_read_buff_write(0x5b);

        active_read_buff_write(0x41);

        break;

    case SC_DOWNARR:

        active_read_buff_write(0x1b);

        active_read_buff_write(0x5b);

        active_read_buff_write(0x42);

        break;

    case SC_HOME:

        active_read_buff_write(0x1b);

        active_read_buff_write(0x4f);

        active_read_buff_write(0x48);

        break;

    case SC_END:

        active_read_buff_write(0x1b);

        active_read_buff_write(0x4f);

        active_read_buff_write(0x46);

        break;

    case SC_DELETE:

        active_read_buff_write(0x1b);

        active_read_buff_write(0x5b);

        active_read_buff_write(0x33);

        active_read_buff_write(0x7e);

        break;

    default:

            letter = is_lower(ascii);

        capslock = (keyflags & PRESSED_CAPSLOCK) || (lockflags & LOCKED_CAPSLOCK);

        shift = keyflags & PRESSED_SHIFT;

        if (letter && capslock)

            shift = !shift;

        if (shift)

            map = sc_secondary_map;

        active_read_buff_write(map[sc]);

        break;

    }

    /*spinlock_unlock(&keylock);*/

}

/** @}

 */