/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 *
 * Copyright (C) 2008 by Mark Arigo
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/

#include "config.h"
#include "system.h"
#include "kernel.h"
#include "button.h"
#include "backlight.h"
#include "powermgmt.h"
#include "synaptics-mep.h"

/*#define LOGF_ENABLE*/
/*#include "logf.h"*/

static int int_btn = BUTTON_NONE;
#ifndef BOOTLOADER
static int old_pos = -1;
static int scroll_repeat = BUTTON_NONE;
#endif
static int repeat = 0;

#ifndef BOOTLOADER
void button_init_device(void)
{
    /* The touchpad is powered on and initialized in power-hdd1630.c
       since it needs to be ready for both buttons and button lights. */
}

/*
 * Button interrupt handler
 */
void button_int(void)
{
    char data[4];
    int val;

    int_btn = BUTTON_NONE;

    val = touchpad_read_device(data, 4);

    if (data[0] == MEP_BUTTON_HEADER)
    {
        /* Buttons packet */
        if (data[1] & 0x1)
            int_btn |= BUTTON_LEFT;
        if (data[1] & 0x2)
            int_btn |= BUTTON_MENU;
        if (data[1] & 0x4)
            int_btn |= BUTTON_RIGHT;
        if (data[1] & 0x8)
            int_btn |= BUTTON_VIEW;
    }
    else if ((data[1] & MEP_GESTURE) && (data[3] >> 6) == 0) /* index = 0 */
    {
        int_btn |= BUTTON_TAP;
    }
    else if (data[0] == MEP_ABSOLUTE_HEADER)
    {
        if (data[1] & MEP_FINGER)
        {
            /* Absolute packet - the finger is on the horizontal strip.
                Position ranges from 1-4095, with 1 at the bottom. */
            val = ((data[1] >> 4) << 8) | data[2]; /* position */

            /* The HDD63x0 actually has 2 scrollbars. One vertical and one horizontal 
            (where the prev, play, and next buttons are). Because of that, we need to know
            which sensor is reporting data. */
            if ((data[3] >> 6) == 1) /* index = 1 */
            {
                if ((val > 0) && (val <= 1365))
                    int_btn |= BUTTON_PREV;
                else if ((val > 1365) && (val <= 2730))
                    int_btn |= BUTTON_PLAY;
                else if ((val > 2730) && (val <= 4095))
                    int_btn |= BUTTON_NEXT;
            } else
            {
                int scr_pos = val >> 8; /* split the scrollstrip into 16 regions */
                if ((old_pos<scr_pos)&&(old_pos!=-1)) int_btn = BUTTON_UP;
                if ((old_pos>scr_pos)&&(old_pos!=-1)) int_btn = BUTTON_DOWN;

                old_pos = scr_pos;

                /* repeat button */
                repeat = 0;
                if (int_btn != BUTTON_NONE)
                {
                    if (int_btn != scroll_repeat)
                        scroll_repeat = int_btn;
                    else repeat = BUTTON_REPEAT;
                }
            }
        }
        else
        {
            old_pos = -1;
            scroll_repeat = BUTTON_NONE;
        }
    }
}
#else
void button_init_device(void){}
#endif /* bootloader */

bool button_hold(void)
{
    return !(GPIOJ_INPUT_VAL & 0x8);
}

/*
 * Get button pressed from hardware
 */
int button_read_device(void)
{
    int btn = int_btn;

    /* Hold */
    if(button_hold())
        return BUTTON_NONE;

    /* Device buttons */
    if (!(GPIOA_INPUT_VAL & 0x02)) btn |= BUTTON_VOL_UP;
    if (!(GPIOA_INPUT_VAL & 0x04)) btn |= BUTTON_VOL_DOWN;
    if (!(GPIOD_INPUT_VAL & 0x40)) btn |= BUTTON_POWER;

    /* Scrollstrip direct button post - much better response */
    if ((btn == BUTTON_UP) || (btn == BUTTON_DOWN))
    {
        button_queue_post(btn|repeat,0);
        backlight_on();
        buttonlight_on();
        reset_poweroff_timer();

        int_btn = BUTTON_NONE;
        repeat = BUTTON_NONE;
        btn = BUTTON_NONE;
    }

    return btn;
}

bool headphones_inserted(void)
{
    return (GPIOE_INPUT_VAL & 0x80) ? true : false;
}