mirror of
https://github.com/Rockbox/rockbox.git
synced 2025-11-09 05:02:33 -05:00
b1511738f7
Added lcd inversion Fix issue where backlight would turn on before first frame rendered Fix issue where backlight would shortly appear at 100% before PWM is ready during fade in Turn off backlight before booting/RoLo/shutdown to avoid it being enabled on next boot Fix issue where fade in isn't smooth because brightness levels below 13 were basically equalivent to off, by removing these brightness levels Change-Id: I868eae2cbeea52c6af7d09c886958ff46167fe26
71 lines
2.3 KiB
C
71 lines
2.3 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) 2013 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 "pinctrl-imx233.h"
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#include "kernel.h"
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static int last_brightness;
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void backlight_hw_brightness(int brightness)
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{
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bool en = brightness > 0;
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/* brightness has extreme dip above 88% duty cycle, limit range to [87%, 0%] */
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if (en)
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imx233_pwm_setup_simple(2, 24000, 88 - brightness);
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imx233_pwm_enable(2, en);
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if (last_brightness == 0 && en)
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sleep(HZ / 25); /* make sure PWM settings are applied */
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last_brightness = brightness;
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imx233_pinctrl_set_gpio(0, 10, en);
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}
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bool backlight_hw_init(void)
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{
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imx233_pinctrl_acquire(0, 10, "backlight_enable");
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imx233_pinctrl_set_function(0, 10, PINCTRL_FUNCTION_GPIO);
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imx233_pinctrl_enable_gpio(0, 10, true);
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backlight_hw_brightness(0);
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return false;
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}
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void backlight_hw_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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sleep(HZ / 10); /* make sure screen is not white anymore */
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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_hw_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_hw_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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