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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 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 <stdlib.h>
#include "cpu.h"
#include "kernel.h"
#include "thread.h"
#include "i2c.h"
#include "debug.h"
#include "rtc.h"
#include "usb.h"
#include "power.h"
#include "system.h"
#include "button.h"
#include "timer.h"
#include "backlight.h"
#include "backlight-target.h"
/* Index 0 is a dummy, 1..31 are used */
static unsigned char log_brightness[32] = {
0, 1, 2, 4, 6, 9, 12, 16, 20, 25, 30, 36,
42, 49, 56, 64, 72, 81, 90, 100, 110, 121, 132, 144,
156, 169, 182, 196, 210, 225, 240, 255
};
static unsigned brightness = 100; /* 1 to 255 */
static bool enabled = false;
/* Handling B03 in _backlight_on() and _backlight_off() makes backlight go off
* without delay. Not doing that does a short (fixed) fade out. Opt for the
* latter. */
void _backlight_on(void)
{
/* brightness full */
outl(0x80000000 | (brightness << 16), 0x7000a010);
/* GPIO_SET_BITWISE(GPIOB_OUTPUT_VAL, 0x08); */
enabled = true;
}
void _backlight_off(void)
{
outl(0x80000000, 0x7000a010);
/* GPIO_CLEAR_BITWISE(GPIOB_OUTPUT_VAL, 0x08); */
enabled = false;
}
void _backlight_set_brightness(int val)
{
brightness = log_brightness[val];
if (enabled)
outl(0x80000000 | (brightness << 16), 0x7000a010);
}
bool _backlight_init(void)
{
GPIO_SET_BITWISE(GPIOB_ENABLE, 0x0c); /* B02 and B03 enable */
GPIO_SET_BITWISE(GPIOB_OUTPUT_VAL, 0x08); /* B03 = 1 */
GPO32_ENABLE &= ~0x2000000; /* D01 disable, so pwm takes over */
DEV_EN |= DEV_PWM; /* PWM enable */
_backlight_on();
return true;
}
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