451aa86244
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27645 a1c6a512-1295-4272-9138-f99709370657
151 lines
4.4 KiB
C
151 lines
4.4 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) 2009 by Bob Cousins
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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 "cpu.h"
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#include "system.h"
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#include "backlight-target.h"
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#include "backlight.h"
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#include "lcd.h"
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#include "power.h"
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/* Dummy value at index 0, 1-12 used. */
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static const unsigned char log_brightness[13] =
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{0,0,1,2,3,5,7,10,15,22,31,44,63};
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static enum backlight_states
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{
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BACKLIGHT_CONTROL_IDLE,
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BACKLIGHT_CONTROL_OFF,
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BACKLIGHT_CONTROL_ON,
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BACKLIGHT_CONTROL_SET,
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BACKLIGHT_CONTROL_FADE
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} backlight_control;
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static unsigned char _backlight_brightness;
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static unsigned char backlight_target;
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/* Assumes that the backlight has been initialized */
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void _backlight_set_brightness(int brightness)
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{
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/* stop the interrupt from messing us up */
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backlight_control = BACKLIGHT_CONTROL_IDLE;
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_backlight_brightness = log_brightness[brightness];
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backlight_control = BACKLIGHT_CONTROL_SET;
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}
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static void _backlight_set_state (unsigned int level)
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{
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if (level == 0)
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GPGDAT &= ~GPIO_LCD_PWR;
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else
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GPGDAT |= GPIO_LCD_PWR;
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}
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/* led_control_service runs in interrupt context - be brief!
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* This service is called once per interrupt timer tick - 100 times a second.
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*
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* There should be at most only one i2c operation per call - if more are need
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* the calls should be spread across calls.
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*
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* Putting all led servicing in one thread means that we wont step on any
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* i2c operations - they are all serialized here in the ISR tick. It also
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* insures that we get called at equal timing for good visual effect.
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*/
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#ifndef BOOTLOADER
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static void led_control_service(void)
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{
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switch (backlight_control)
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{
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case BACKLIGHT_CONTROL_IDLE:
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backlight_control = BACKLIGHT_CONTROL_IDLE;
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break;
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case BACKLIGHT_CONTROL_OFF:
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_backlight_set_brightness(0);
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backlight_control = BACKLIGHT_CONTROL_IDLE;
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break;
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case BACKLIGHT_CONTROL_ON:
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_backlight_set_brightness(255);
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backlight_control = BACKLIGHT_CONTROL_IDLE;
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break;
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case BACKLIGHT_CONTROL_SET:
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_backlight_set_brightness(255);
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backlight_control = BACKLIGHT_CONTROL_IDLE;
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break;
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case BACKLIGHT_CONTROL_FADE:
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_backlight_set_brightness(0);
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backlight_control = BACKLIGHT_CONTROL_IDLE;
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break;
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default:
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backlight_control = BACKLIGHT_CONTROL_IDLE;
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break;
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}
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}
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#endif /* BOOTLOADER */
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static void __backlight_dim(bool dim_now)
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{
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/* dont let the interrupt tick happen */
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backlight_control = BACKLIGHT_CONTROL_IDLE;
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backlight_target = dim_now ? 0 : _backlight_brightness;
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if(backlight_target==0 && _backlight_brightness==0)
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{
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if(dim_now == false)
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backlight_control = BACKLIGHT_CONTROL_ON;
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else
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backlight_control = BACKLIGHT_CONTROL_OFF;
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}
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else
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backlight_control = BACKLIGHT_CONTROL_FADE;
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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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__backlight_dim(false);
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}
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void _backlight_off(void)
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{
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__backlight_dim(true);
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}
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bool _backlight_init(void)
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{
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unsigned char brightness = log_brightness[DEFAULT_BRIGHTNESS_SETTING];
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_backlight_brightness = brightness;
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backlight_control = BACKLIGHT_CONTROL_ON;
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_backlight_set_state (1);
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S3C2440_GPIO_CONFIG (GPGCON, 4, GPIO_OUTPUT);
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#ifndef BOOTLOADER
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/* put the led control on the tick list */
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tick_add_task(led_control_service);
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#endif
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return true;
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}
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