/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 *
 * Copyright (C) 2008 by Maurus Cuelenaere
 *
 * 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 "jz4740.h"
#include "button.h"
#include "button-target.h"
#include "powermgmt.h"
#include "kernel.h"
#include "backlight.h"
#include "logf.h"
#include "adc.h"

#ifdef ONDA_VX747
#define BTN_OFF      (1 << 29)
#define BTN_VOL_DOWN (1 << 27)
#define BTN_HOLD     (1 << 16)
#define BTN_MENU     (1 << 1)
#define BTN_VOL_UP   (1 << 0)

#define BTN_MASK     (BTN_OFF | BTN_VOL_DOWN | \
                      BTN_MENU | BTN_VOL_UP)
#elif defined(ONDA_VX747P)
#define BTN_OFF      (1 << 29)
#define BTN_VOL_DOWN (1 << 27)
#define BTN_HOLD     (1 << 22)  /* on REG_GPIO_PXPIN(2) */
#define BTN_MENU     (1 << 20)
#define BTN_VOL_UP   (1 << 19)

#define BTN_MASK     (BTN_OFF | BTN_VOL_DOWN | \
                      BTN_MENU | BTN_VOL_UP)
#elif defined(ONDA_VX777)
#define BTN_OFF      (1 << 29)

#define BTN_MASK     (BTN_OFF)
#else
#error No buttons defined!
#endif


#define TS_AD_COUNT     3
#define SADC_CFG_SNUM   ((TS_AD_COUNT - 1) << SADC_CFG_SNUM_BIT)

#define SADC_CFG_INIT   (                                 \
                        (2 << SADC_CFG_CLKOUT_NUM_BIT) |  \
                        SADC_CFG_XYZ1Z2                |  \
                        SADC_CFG_SNUM                  |  \
                        (1 << SADC_CFG_CLKDIV_BIT)     |  \
                        SADC_CFG_PBAT_HIGH             |  \
                        SADC_CFG_CMD_INT_PEN              \
                        )

static signed int x_pos, y_pos;
static int datacount = 0;
static volatile int cur_touch = 0;
static volatile bool pen_down = false;
static struct mutex battery_mtx;
static struct semaphore battery_done;

unsigned short battery_level_disksafe = 1600;

unsigned short battery_level_shutoff = 1550;

/* voltages (millivolt) of 0%, 10%, ... 100% when charging disabled */
unsigned short percent_to_volt_discharge[11] =
{
    1550, 1790, 1810, 1825, 1855, 1865, 1875, 1900, 1930, 1985, 2200
};
/* voltages (millivolt) of 0%, 10%, ... 100% when charging enabled */
unsigned short percent_to_volt_charge[11] =
{
    1580, 1870, 1900, 1900, 1940, 1965, 1990, 2020, 2050, 2090, 2620
};

/* VBAT = (BDATA/4096) * 7.5V */
#define BATTERY_SCALE_FACTOR 7500

/* Returns battery voltage from ADC [millivolts] */
int _battery_voltage(void)
{
    unsigned int dummy, bat_val;

    mutex_lock(&battery_mtx);

    dummy = REG_SADC_BATDAT;
    dummy = REG_SADC_BATDAT;
    (void)dummy;

    REG_SADC_ENA |= SADC_ENA_PBATEN;

    semaphore_wait(&battery_done, HZ/4);
    bat_val = REG_SADC_BATDAT;

    logf("%d %d", bat_val, (bat_val * BATTERY_SCALE_FACTOR) / 4096);

    mutex_unlock(&battery_mtx);

    return (bat_val * BATTERY_SCALE_FACTOR) / 4096;
}

void button_init_device(void)
{
    __gpio_as_input(32*3 + 29); /* VX777 and VX747(+) */

#ifdef ONDA_VX747
    __gpio_as_input(32*3 + 27);
    __gpio_as_input(32*3 + 16);
    __gpio_as_input(32*3 + 1);
    __gpio_as_input(32*3 + 0);
#elif defined(ONDA_VX747P)
    __gpio_as_input(32*3 + 27);
    __gpio_as_input(32*3 + 20);
    __gpio_as_input(32*3 + 19);
    __gpio_as_input(32*2 + 22);
#endif
}

bool button_hold(void)
{
    return (
#ifdef ONDA_VX747
            (~REG_GPIO_PXPIN(3)) & BTN_HOLD
#elif defined(ONDA_VX747P)
            (~REG_GPIO_PXPIN(2)) & BTN_HOLD
#elif defined(ONDA_VX777)
            false
#endif
            ? true : false
           );
}

int button_read_device(int *data)
{
    int ret = 0;
    static int old_data = 0;

    *data = old_data;

    /* Filter button events out if HOLD button is pressed at firmware/ level */
    if(button_hold())
        return 0;

    int tmp = (~REG_GPIO_PXPIN(3)) & BTN_MASK;

    if(tmp & BTN_OFF)
        ret |= BUTTON_POWER;
#ifndef ONDA_VX777
    if(tmp & BTN_VOL_DOWN)
        ret |= BUTTON_VOL_DOWN;
    if(tmp & BTN_VOL_UP)
        ret |= BUTTON_VOL_UP;
    if(tmp & BTN_MENU)
        ret |= BUTTON_MENU;
#endif

    if(cur_touch != 0 && pen_down)
    {
        ret |= touchscreen_to_pixels(cur_touch >> 16, cur_touch & 0xFFFF, data);
#if CONFIG_ORIENTATION == SCREEN_LANDSCAPE
        *data = (*data & 0xFFFF) | ((LCD_HEIGHT - (*data >> 16)) << 16);
#endif
        if( UNLIKELY(!is_backlight_on(true)) )
            *data = 0;

        old_data = *data;
    }

    return ret;
}

/* Interrupt handler */
void SADC(void)
{
    unsigned char state, sadcstate;

    sadcstate = REG_SADC_STATE;
    state = sadcstate & (~REG_SADC_CTRL);
    REG_SADC_STATE &= sadcstate;

    if(state & SADC_CTRL_PENDM)
    {
        /* Pen down IRQ */
        REG_SADC_CTRL &= (~(SADC_CTRL_PENUM |  SADC_CTRL_TSRDYM));
        REG_SADC_CTRL |= (SADC_CTRL_PENDM);
        pen_down = true;
    }

    if(state & SADC_CTRL_PENUM)
    {
        /* Pen up IRQ */
        REG_SADC_CTRL &= (~SADC_CTRL_PENDM );
        REG_SADC_CTRL |= SADC_CTRL_PENUM;
        pen_down = false;
        datacount = 0;
        cur_touch = 0;
    }

    if(state & SADC_CTRL_TSRDYM)
    {
        unsigned int   dat;
        unsigned short xData, yData;
        signed short   tsz1Data, tsz2Data;

        dat = REG_SADC_TSDAT;
        xData = (dat >>  0) & 0xFFF;
        yData = (dat >> 16) & 0xFFF;

        dat = REG_SADC_TSDAT;
        tsz1Data = (dat >>  0) & 0xFFF;
        tsz2Data = (dat >> 16) & 0xFFF;

        if(!pen_down)
            return;

        tsz1Data = tsz2Data - tsz1Data;

        if((tsz1Data > 100) || (tsz1Data < -100))
        {
            if(datacount == 0)
            {
                x_pos = xData;
                y_pos = yData;
            }
            else
            {
                x_pos += xData;
                y_pos += yData;
            }

            datacount++;

            if(datacount >= TS_AD_COUNT)
            {
                cur_touch = ((x_pos / datacount) << 16) |
                            ((y_pos / datacount) & 0xFFFF);
                datacount = 0;
            }
        }
        else
            datacount = 0;
    }

    if(state & SADC_CTRL_PBATRDYM)
    {
        /* Battery AD IRQ */
        semaphore_release(&battery_done);
    }
}

void adc_init(void)
{
    __cpm_start_sadc();
    REG_SADC_ENA = 0;
    REG_SADC_STATE &= (~REG_SADC_STATE);
    REG_SADC_CTRL = 0x1f;

    REG_SADC_CFG = SADC_CFG_INIT;

    system_enable_irq(IRQ_SADC);

    REG_SADC_SAMETIME = 10;
    REG_SADC_WAITTIME = 100;
    REG_SADC_STATE &= ~REG_SADC_STATE;
    REG_SADC_CTRL = ~(SADC_CTRL_PENDM | SADC_CTRL_PENUM | SADC_CTRL_TSRDYM | SADC_CTRL_PBATRDYM);
    REG_SADC_ENA = SADC_ENA_TSEN;

    mutex_init(&battery_mtx);
    semaphore_init(&battery_done, 1, 0);
}

void adc_close(void)
{
    REG_SADC_ENA = 0;
    __intc_mask_irq(IRQ_SADC);
    sleep(20);
    __cpm_stop_sadc();
}

#ifndef HAS_BUTTON_HOLD
void touchscreen_enable_device(bool en)
{
    (void)en; /* FIXME: do something smart */
}
#endif