90 lines
2.7 KiB
C
90 lines
2.7 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id: backlight-gigabeat-s.c 25800 2010-05-04 10:07:53Z jethead71 $
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*
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* Copyright (C) 2011 by Lorenzo Miori
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include "system.h"
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#include "backlight.h"
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#include "backlight-target.h"
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#include "lcd.h"
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#include "as3514.h"
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#include "ascodec-target.h"
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#include <fcntl.h>
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#include "unistd.h"
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static bool backlight_on_status = true; /* Is on or off? */
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/*TODO: see if LCD sleep could be implemented in a better way -> ie using a rockbox feature */
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/* Turn off LCD power supply */
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static void _backlight_lcd_sleep(void)
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{
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int fp = open("/sys/class/graphics/fb0/blank", O_RDWR);
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write(fp, "1", 1);
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close(fp);
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}
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/* Turn on LCD screen */
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static void _backlight_lcd_power(void)
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{
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int fp = open("/sys/class/graphics/fb0/blank", O_RDWR);
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write(fp, "0", 1);
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close(fp);
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}
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bool _backlight_init(void)
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{
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/* We have nothing to do */
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return true;
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}
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void _backlight_on(void)
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{
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if (!backlight_on_status)
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{
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/* Turn on lcd power before backlight */
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_backlight_lcd_power();
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/* Original app sets this to 0xb1 when backlight is on... */
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ascodec_write_pmu(AS3543_BACKLIGHT, 0x1, 0xb1);
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}
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backlight_on_status = true;
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}
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void _backlight_off(void)
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{
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if (backlight_on_status) {
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/* Disabling the DCDC15 completely, keeps brightness register value */
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ascodec_write_pmu(AS3543_BACKLIGHT, 0x1, 0x00);
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/* Turn off lcd power then */
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_backlight_lcd_sleep();
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}
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backlight_on_status = false;
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}
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void _backlight_set_brightness(int brightness)
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{
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/* Just another check... */
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if (brightness > MAX_BRIGHTNESS_SETTING)
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brightness = MAX_BRIGHTNESS_SETTING;
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if (brightness < MIN_BRIGHTNESS_SETTING)
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brightness = MIN_BRIGHTNESS_SETTING;
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ascodec_write_pmu(AS3543_BACKLIGHT, 0x3, brightness << 3 & 0xf8);
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}
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