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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2009 by Bob Cousins
*
* 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 "cpu.h"
#include "system.h"
#include "backlight-target.h"
#include "backlight.h"
#include "lcd.h"
#include "power.h"
/* Dummy value at index 0, 1-12 used. */
static const unsigned char log_brightness[13] =
{0,0,1,2,3,5,7,10,15,22,31,44,63};
static enum backlight_states
{
BACKLIGHT_CONTROL_IDLE,
BACKLIGHT_CONTROL_OFF,
BACKLIGHT_CONTROL_ON,
BACKLIGHT_CONTROL_SET,
BACKLIGHT_CONTROL_FADE
} backlight_control;
static unsigned char _backlight_brightness;
static unsigned char backlight_target;
/* Assumes that the backlight has been initialized */
void _backlight_set_brightness(int brightness)
{
/* stop the interrupt from messing us up */
backlight_control = BACKLIGHT_CONTROL_IDLE;
_backlight_brightness = log_brightness[brightness];
backlight_control = BACKLIGHT_CONTROL_SET;
}
static void _backlight_set_state (unsigned int level)
{
if (level == 0)
GPGDAT &= ~GPIO_LCD_PWR;
else
GPGDAT |= GPIO_LCD_PWR;
}
/* led_control_service runs in interrupt context - be brief!
* This service is called once per interrupt timer tick - 100 times a second.
*
* There should be at most only one i2c operation per call - if more are need
* the calls should be spread across calls.
*
* Putting all led servicing in one thread means that we wont step on any
* i2c operations - they are all serialized here in the ISR tick. It also
* insures that we get called at equal timing for good visual effect.
*/
#ifndef BOOTLOADER
static void led_control_service(void)
{
switch (backlight_control)
{
case BACKLIGHT_CONTROL_IDLE:
backlight_control = BACKLIGHT_CONTROL_IDLE;
break;
case BACKLIGHT_CONTROL_OFF:
_backlight_set_brightness(0);
backlight_control = BACKLIGHT_CONTROL_IDLE;
break;
case BACKLIGHT_CONTROL_ON:
_backlight_set_brightness(255);
backlight_control = BACKLIGHT_CONTROL_IDLE;
break;
case BACKLIGHT_CONTROL_SET:
_backlight_set_brightness(255);
backlight_control = BACKLIGHT_CONTROL_IDLE;
break;
case BACKLIGHT_CONTROL_FADE:
_backlight_set_brightness(0);
backlight_control = BACKLIGHT_CONTROL_IDLE;
break;
default:
backlight_control = BACKLIGHT_CONTROL_IDLE;
break;
}
}
#endif /* BOOTLOADER */
static void __backlight_dim(bool dim_now)
{
/* dont let the interrupt tick happen */
backlight_control = BACKLIGHT_CONTROL_IDLE;
backlight_target = dim_now ? 0 : _backlight_brightness;
if(backlight_target==0 && _backlight_brightness==0)
{
if(dim_now == false)
backlight_control = BACKLIGHT_CONTROL_ON;
else
backlight_control = BACKLIGHT_CONTROL_OFF;
}
else
backlight_control = BACKLIGHT_CONTROL_FADE;
}
void _backlight_on(void)
{
#ifdef HAVE_LCD_ENABLE
lcd_enable(true); /* power on lcd + visible display */
#endif
__backlight_dim(false);
}
void _backlight_off(void)
{
__backlight_dim(true);
}
bool _backlight_init(void)
{
unsigned char brightness = log_brightness[DEFAULT_BRIGHTNESS_SETTING];
_backlight_brightness = brightness;
backlight_control = BACKLIGHT_CONTROL_ON;
_backlight_set_state (1);
S3C2440_GPIO_CONFIG (GPGCON, 4, GPIO_OUTPUT);
#ifndef BOOTLOADER
/* put the led control on the tick list */
tick_add_task(led_control_service);
#endif
return true;
}
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