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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Linus Nielsen Feltzing
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* 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"
static int brightness = 1; /* 1 to 32 */
static int current_dim = 16; /* default after enabling the backlight dimmer */
static bool enabled = false;
void _backlight_set_brightness(int val)
{
int oldlevel;
if (current_dim < val)
{
do
{
oldlevel = set_irq_level(HIGHEST_IRQ_LEVEL);
GPIO_CLEAR_BITWISE(GPIOD_OUTPUT_VAL, 0x80);
udelay(10);
GPIO_SET_BITWISE(GPIOD_OUTPUT_VAL, 0x80);
set_irq_level(oldlevel);
udelay(10);
}
while (++current_dim < val);
}
else if (current_dim > val)
{
do
{
oldlevel = set_irq_level(HIGHEST_IRQ_LEVEL);
GPIO_CLEAR_BITWISE(GPIOD_OUTPUT_VAL, 0x80);
udelay(200);
GPIO_SET_BITWISE(GPIOD_OUTPUT_VAL, 0x80);
set_irq_level(oldlevel);
udelay(10);
}
while (--current_dim > val);
}
brightness = val;
}
void _backlight_hw_enable(bool on)
{
if (on == enabled)
return;
if (on)
{
GPIO_SET_BITWISE(GPIOB_OUTPUT_VAL, 0x08);
GPIO_SET_BITWISE(GPIOD_OUTPUT_VAL, 0x80);
sleep(HZ/100);
current_dim = 16;
_backlight_set_brightness(brightness);
}
else
{
GPIO_CLEAR_BITWISE(GPIOD_OUTPUT_VAL, 0x80);
GPIO_CLEAR_BITWISE(GPIOB_OUTPUT_VAL, 0x08);
sleep(HZ/20);
}
enabled = on;
}
/* Switch the backlight on. Works only if the backlight circuit is enabled.
* Called in ISR context for fading, so it must be fast. */
void _backlight_led_on(void)
{
GPIO_SET_BITWISE(GPIOL_OUTPUT_VAL, 0x80);
}
/* Switch the backlight off. Keeps the backlight circuit enabled.
* Called in ISR context for fading, so it must be fast. */
void _backlight_led_off(void)
{
GPIO_CLEAR_BITWISE(GPIOL_OUTPUT_VAL, 0x80);
}
bool _backlight_init(void)
{
GPIO_SET_BITWISE(GPIOB_ENABLE, 0x08);
GPIO_SET_BITWISE(GPIOB_OUTPUT_EN, 0x08);
GPIO_SET_BITWISE(GPIOD_ENABLE, 0x80);
GPIO_SET_BITWISE(GPIOD_OUTPUT_EN, 0x80);
_backlight_hw_enable(true);
GPIO_SET_BITWISE(GPIOL_ENABLE, 0x80);
GPIO_SET_BITWISE(GPIOL_OUTPUT_EN, 0x80);
GPIO_SET_BITWISE(GPIOL_OUTPUT_VAL, 0x80);
return true;
}
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