rockbox/firmware/target/arm/tms320dm320/mrobe-500/backlight-mr500.c

/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2007 by Karl Kurbjun
 *
 * 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"

void _backlight_on(void)
{
#if defined(HAVE_LCD_SLEEP) && !defined(BOOTLOADER)
    backlight_lcd_sleep_countdown(false); /* stop counter */
#endif
#ifdef HAVE_LCD_ENABLE
    lcd_enable(true); /* power on lcd + visible display */
#endif
    _backlight_set_brightness(DEFAULT_BRIGHTNESS_SETTING);
}

void _backlight_off(void)
{
    _backlight_set_brightness(0);
#if defined(HAVE_LCD_SLEEP) && !defined(BOOTLOADER)
    /* Disable lcd after fade completes (when lcd_sleep timeout expires) */
    backlight_lcd_sleep_countdown(true); /* start countdown */
#endif
}

/* Assumes that the backlight has been initialized */
void _backlight_set_brightness(int brightness)
{
    uint8_t bl_command[] = {0xa4, 0x00, brightness, 0xbb};
    spi_block_transfer(SPI_target_BACKLIGHT, bl_command, 4, 0, 0);
}

void __backlight_dim(bool dim_now)
{
    _backlight_set_brightness(dim_now ?
        DEFAULT_BRIGHTNESS_SETTING :
        DEFAULT_DIMNESS_SETTING);
}

bool _backlight_init(void)
{
    _backlight_set_brightness(DEFAULT_BRIGHTNESS_SETTING);
    return true;
}