86 lines
2.7 KiB
C
86 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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* $Id$
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*
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* Copyright (C) 2012 by Amaury Pouly
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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 "lcd.h"
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#include "backlight.h"
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#include "backlight-target.h"
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#include "pwm-imx233.h"
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#include "mpr121.h"
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void _backlight_set_brightness(int brightness)
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{
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imx233_pwm_setup_channel(2, 1024, HW_PWM_PERIODx__CDIV__DIV_1,
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0, HW_PWM_PERIODx__STATE__HIGH,
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(brightness * 1024) / 100, HW_PWM_PERIODx__STATE__LOW);
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imx233_pwm_enable_channel(2, true);
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}
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bool _backlight_init(void)
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{
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_backlight_set_brightness(DEFAULT_BRIGHTNESS_SETTING);
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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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#ifdef HAVE_LCD_ENABLE
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lcd_enable(true); /* power on lcd + visible display */
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#endif
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/* don't do anything special, the core will set the brightness */
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}
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void _backlight_off(void)
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{
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/* there is no real on/off but we can set to 0 brightness */
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_backlight_set_brightness(0);
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#ifdef HAVE_LCD_ENABLE
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lcd_enable(false); /* power off visible display */
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#endif
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}
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/* ELE8 is the button light GPIO */
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void _buttonlight_on(void)
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{
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/* assume mpr121 was initialized by button-zenxfi3.c */
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mpr121_set_gpio_output(8, ELE_GPIO_SET);
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}
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void _buttonlight_off(void)
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{
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/* assume mpr121 was initialized by button-zenxfi3.c */
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mpr121_set_gpio_output(8, ELE_GPIO_CLR);
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}
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void _buttonlight_set_brightness(int brightness)
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{
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/* assume mpr121 was initialized by button-zenxfi3.c */
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/* since backlight brightness is the same for the screen and the button light,
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* map [MIN_BRIGHTNESS_SETTING,MAX_BRIGHTNESS_SETTING] to
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* [ELE_PWM_MIN_DUTY,ELE_PWM_MAX_DUTY] */
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brightness = ELE_PWM_MIN_DUTY + (brightness - MIN_BRIGHTNESS_SETTING) *
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(ELE_PWM_MAX_DUTY - ELE_PWM_MIN_DUTY + 1) /
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(MAX_BRIGHTNESS_SETTING - MIN_BRIGHTNESS_SETTING + 1);
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brightness = MIN(brightness, ELE_PWM_MAX_DUTY);
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mpr121_set_gpio_pwm(8, brightness);
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}
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