a12894c6dc
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18066 a1c6a512-1295-4272-9138-f99709370657
122 lines
3.4 KiB
C
122 lines
3.4 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) 2002 by Linus Nielsen Feltzing
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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 <stdlib.h>
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#include "cpu.h"
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#include "kernel.h"
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#include "thread.h"
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#include "i2c.h"
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#include "debug.h"
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#include "rtc.h"
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#include "usb.h"
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#include "power.h"
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#include "system.h"
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#include "button.h"
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#include "timer.h"
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#include "backlight.h"
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#include "backlight-target.h"
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static int brightness = 1; /* 1 to 32 */
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static int current_dim = 16; /* default after enabling the backlight dimmer */
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static bool enabled = false;
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void _backlight_set_brightness(int val)
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{
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int oldlevel;
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if (current_dim < val)
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{
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do
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{
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oldlevel = disable_irq_save();
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GPIO_CLEAR_BITWISE(GPIOD_OUTPUT_VAL, 0x80);
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udelay(10);
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GPIO_SET_BITWISE(GPIOD_OUTPUT_VAL, 0x80);
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restore_irq(oldlevel);
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udelay(10);
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}
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while (++current_dim < val);
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}
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else if (current_dim > val)
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{
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do
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{
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oldlevel = disable_irq_save();
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GPIO_CLEAR_BITWISE(GPIOD_OUTPUT_VAL, 0x80);
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udelay(200);
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GPIO_SET_BITWISE(GPIOD_OUTPUT_VAL, 0x80);
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restore_irq(oldlevel);
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udelay(10);
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}
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while (--current_dim > val);
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}
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brightness = val;
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}
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void _backlight_hw_enable(bool on)
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{
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if (on == enabled)
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return;
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if (on)
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{
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GPIO_SET_BITWISE(GPIOB_OUTPUT_VAL, 0x08);
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GPIO_SET_BITWISE(GPIOD_OUTPUT_VAL, 0x80);
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sleep(HZ/100);
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current_dim = 16;
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_backlight_set_brightness(brightness);
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}
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else
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{
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GPIO_CLEAR_BITWISE(GPIOD_OUTPUT_VAL, 0x80);
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GPIO_CLEAR_BITWISE(GPIOB_OUTPUT_VAL, 0x08);
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sleep(HZ/20);
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}
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enabled = on;
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}
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/* Switch the backlight on. Works only if the backlight circuit is enabled.
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* Called in ISR context for fading, so it must be fast. */
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void _backlight_led_on(void)
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{
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GPIO_SET_BITWISE(GPIOL_OUTPUT_VAL, 0x80);
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}
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/* Switch the backlight off. Keeps the backlight circuit enabled.
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* Called in ISR context for fading, so it must be fast. */
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void _backlight_led_off(void)
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{
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GPIO_CLEAR_BITWISE(GPIOL_OUTPUT_VAL, 0x80);
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}
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bool _backlight_init(void)
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{
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GPIO_SET_BITWISE(GPIOB_ENABLE, 0x08);
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GPIO_SET_BITWISE(GPIOB_OUTPUT_EN, 0x08);
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GPIO_SET_BITWISE(GPIOD_ENABLE, 0x80);
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GPIO_SET_BITWISE(GPIOD_OUTPUT_EN, 0x80);
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_backlight_hw_enable(true);
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GPIO_SET_BITWISE(GPIOL_ENABLE, 0x80);
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GPIO_SET_BITWISE(GPIOL_OUTPUT_EN, 0x80);
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GPIO_SET_BITWISE(GPIOL_OUTPUT_VAL, 0x80);
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return true;
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}
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