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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id: $
*
* Copyright (C) 2011 by Tomasz Moń
*
* 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"
#include "spi-target.h"
#include "lcd-target.h"
static void _backlight_write_brightness(int brightness)
{
/*
Maps brightness int to percentage value found in OF
OF PWM1H
5% 14
10% 140
15% 210
20% 280
...
95% 1330
100% 1400
*/
if (brightness > 20)
brightness = 20;
else if (brightness < 0)
brightness = 0;
IO_CLK_PWM1H = brightness*70;
}
void _backlight_on(void)
{
#ifdef HAVE_LCD_SLEEP
if (!lcd_active())
{
lcd_awake();
lcd_update();
}
#endif
/* set GIO34 as PWM1 */
IO_GIO_FSEL3 = (IO_GIO_FSEL3 & 0xFFF3) | (1 << 2);
#if (CONFIG_BACKLIGHT_FADING == BACKLIGHT_NO_FADING)
_backlight_write_brightness(backlight_brightness);
#endif
}
void _backlight_off(void)
{
_backlight_write_brightness(0);
bitclr16(&IO_GIO_FSEL3, 0xC); /* set GIO34 to normal GIO */
bitclr16(&IO_GIO_INV2, (1 << 2)); /* make sure GIO34 is not inverted */
IO_GIO_BITCLR2 = (1 << 2); /* drive GIO34 low */
}
/* Assumes that the backlight has been initialized */
void _backlight_set_brightness(int brightness)
{
_backlight_write_brightness(brightness);
}
void __backlight_dim(bool dim_now)
{
_backlight_set_brightness(dim_now ?
DEFAULT_BRIGHTNESS_SETTING :
DEFAULT_DIMNESS_SETTING);
}
bool _backlight_init(void)
{
IO_CLK_PWM1C = 0x58D; /* as found in OF */
_backlight_set_brightness(backlight_brightness);
return true;
}
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