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/*

 * Copyright (c) 2009 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 Keyboard processing.

 */

#include <genarch/kbrd/kbrd.h>

#include <genarch/kbrd/scanc.h>

#ifdef CONFIG_PC_KBD

#include <genarch/kbrd/scanc_pc.h>

#endif

#ifdef CONFIG_SUN_KBD

#include <genarch/kbrd/scanc_sun.h>

#endif

#include <synch/spinlock.h>

#include <console/chardev.h>

#include <console/console.h>

#include <proc/thread.h>

#include <arch.h>

#include <macros.h>

#ifdef CONFIG_SUN_KBD

    #define IGNORE_CODE  0x7f

#endif

#define KEY_RELEASE  0x80

#define PRESSED_SHIFT     (1 << 0)

#define PRESSED_CAPSLOCK  (1 << 1)

#define LOCKED_CAPSLOCK   (1 << 0)

static indev_t kbrdout;

indev_operations_t kbrdout_ops = {

    .poll = NULL

};

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. */

static void key_released(uint8_t);

static void key_pressed(uint8_t);

static void kkbrd(void *arg)

{

    indev_t *in = (indev_t *) arg;

    while (true) {

        uint8_t sc = _getc(in);

#ifdef CONFIG_SUN_KBD

        if (sc == IGNORE_CODE)

            continue;

#endif

        if (sc & KEY_RELEASE)

            key_released(sc ^ KEY_RELEASE);

        else

            key_pressed(sc);

    }

}

void kbrd_init(indev_t *devin)

{

    indev_initialize("kbrd", &kbrdout, &kbrdout_ops);

    thread_t *thread

        = thread_create(kkbrd, devin, TASK, 0, "kkbrd", false);

    if (thread) {

        stdin = &kbrdout;

        thread_ready(thread);

    }

}

/** 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:

        indev_push_character(stdin, 0x1b);

        indev_push_character(stdin, 0x5b);

        indev_push_character(stdin, 0x44);

        break;

    case SC_RIGHTARR:

        indev_push_character(stdin, 0x1b);

        indev_push_character(stdin, 0x5b);

        indev_push_character(stdin, 0x43);

        break;

    case SC_UPARR:

        indev_push_character(stdin, 0x1b);

        indev_push_character(stdin, 0x5b);

        indev_push_character(stdin, 0x41);

        break;

    case SC_DOWNARR:

        indev_push_character(stdin, 0x1b);

        indev_push_character(stdin, 0x5b);

        indev_push_character(stdin, 0x42);

        break;

    case SC_HOME:

        indev_push_character(stdin, 0x1b);

        indev_push_character(stdin, 0x4f);

        indev_push_character(stdin, 0x48);

        break;

    case SC_END:

        indev_push_character(stdin, 0x1b);

        indev_push_character(stdin, 0x4f);

        indev_push_character(stdin, 0x46);

        break;

    case SC_DELETE:

        indev_push_character(stdin, 0x1b);

        indev_push_character(stdin, 0x5b);

        indev_push_character(stdin, 0x33);

        indev_push_character(stdin, 0x7e);

        break;

    default:

        letter = islower(ascii);

        capslock = (keyflags & PRESSED_CAPSLOCK) ||

            (lockflags & LOCKED_CAPSLOCK);

        shift = keyflags & PRESSED_SHIFT;

        if (letter && capslock)

            shift = !shift;

        if (shift)

            map = sc_secondary_map;

        indev_push_character(stdin, map[sc]);

        break;

    }

    spinlock_unlock(&keylock);

}

/** @}

 */