110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
/***************************************************************************
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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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* $Id$
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*
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* Copyright (C) 2008 by Thomas Martitz
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* Copyright (C) 2008 by Martin Ritter
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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 <stdbool.h>
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#include "config.h"
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#include "backlight-target.h"
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#include "system.h"
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#include "backlight.h"
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#include "backlight-sw-fading.h"
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#ifndef BRIGHTNESS_STEP
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#define BRIGHTNESS_STEP 1
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#endif
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/* To adapt a target do:
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* - make sure backlight_hw_on doesn't set the brightness to something other than
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* the previous value (lowest brightness in most cases)
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* add proper #defines for software fading
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*/
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/* can be MIN_BRIGHTNESS_SETTING-1 */
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static int current_brightness = DEFAULT_BRIGHTNESS_SETTING;
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void _backlight_fade_update_state(int brightness)
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{
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current_brightness = brightness;
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}
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/* returns true if fade is finished */
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static bool _backlight_fade_up(void)
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{
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if (LIKELY(current_brightness < backlight_brightness))
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{
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#if BRIGHTNESS_STEP == 1
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backlight_hw_brightness(++current_brightness);
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#else
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current_brightness += BRIGHTNESS_STEP;
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if (current_brightness > MAX_BRIGHTNESS_SETTING)
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current_brightness = MAX_BRIGHTNESS_SETTING;
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backlight_hw_brightness(current_brightness);
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#endif
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}
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return(current_brightness >= backlight_brightness);
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}
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/* returns true if fade is finished */
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static bool _backlight_fade_down(void)
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{
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if (LIKELY(current_brightness > MIN_BRIGHTNESS_SETTING))
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{
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#if BRIGHTNESS_STEP == 1
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backlight_hw_brightness(--current_brightness);
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#else
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current_brightness -= BRIGHTNESS_STEP;
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if (current_brightness < MIN_BRIGHTNESS_SETTING)
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current_brightness = MIN_BRIGHTNESS_SETTING;
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backlight_hw_brightness(current_brightness);
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#endif
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return false;
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}
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else
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{
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/* decrement once more, since backlight is off */
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#if BRIGHTNESS_STEP == 1
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current_brightness--;
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#else
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current_brightness=MIN_BRIGHTNESS_SETTING -1;
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#endif
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backlight_hw_off();
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return true;
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}
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}
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bool _backlight_fade_step(int direction)
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{
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bool done;
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switch(direction)
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{
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case FADING_UP:
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done = _backlight_fade_up();
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break;
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case FADING_DOWN:
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done = _backlight_fade_down();
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break;
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default:
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done = true;
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break;
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}
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return(done);
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}
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