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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2006 by Linus Nielsen Feltzing
*
* 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 "kernel.h"
#include "thread.h"
#include "system.h"
#include "backlight.h"
#include "backlight-target.h"
#include "pcf50606.h"
#include "lcd.h"
bool _backlight_init(void)
{
or_l(0x00020000, &GPIO1_ENABLE);
or_l(0x00020000, &GPIO1_FUNCTION);
or_l(0x00020000, &GPIO1_OUT); /* Start with the backlight ON */
return true; /* Backlight always ON after boot. */
}
void _backlight_on(void)
{
lcd_enable(true);
sleep(HZ/100); /* lcd needs time - avoid flashing for dark screens */
or_l(0x00020000, &GPIO1_OUT);
}
void _backlight_off(void)
{
and_l(~0x00020000, &GPIO1_OUT);
lcd_enable(false);
}
/* set brightness by changing the PWM */
void _backlight_set_brightness(int val)
{
/* disable IRQs while bitbanging */
int old_irq_level = disable_irq_save();
pcf50606_write(0x35, (val << 1) | 0x01); /* 512Hz, Enable PWM */
/* enable IRQs again */
restore_irq(old_irq_level);
}
void _remote_backlight_on(void)
{
and_l(~0x00000002, &GPIO1_OUT);
}
void _remote_backlight_off(void)
{
or_l(0x00000002, &GPIO1_OUT);
}
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