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89ba7e818c
_remote_backlight_* and _buttonlight_* are cleaned as well Change-Id: I73653752831bbe170c26ba95d3bc04c2e3a5cf30
120 lines
3.2 KiB
C
120 lines
3.2 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 Maurus Cuelenaere
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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 "jz4740.h"
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#include "backlight-target.h"
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#include "lcd.h"
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/* PWM_CHN7 == GPIO(32*3 + 31) */
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#define BACKLIGHT_GPIO (32*3+31)
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#define BACKLIGHT_PWM 7
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/* PWM counter (PWM INITL = 0):
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* [0, PWM half rate[ -> backlight off
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* [PWM half rate, PWM full rate[ -> backlight on
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* [PWM full rate, PWM full rate] -> counter reset to 0
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*/
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static int old_val = MAX_BRIGHTNESS_SETTING;
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static const unsigned char logtable[] = {255, 254, 253, 252, 250, 248, 245, 240, 233, 224, 211, 192, 165, 128, 75, 0};
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static void set_backlight(int val)
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{
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if(val == old_val)
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return;
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__tcu_disable_pwm_output(BACKLIGHT_PWM);
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__tcu_stop_counter(BACKLIGHT_PWM);
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__tcu_set_count(BACKLIGHT_PWM, 0);
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__tcu_set_half_data(BACKLIGHT_PWM, logtable[val - 1]);
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__tcu_set_full_data(BACKLIGHT_PWM, 256);
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__tcu_start_counter(BACKLIGHT_PWM);
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__tcu_enable_pwm_output(BACKLIGHT_PWM);
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old_val = val;
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}
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static void setbacklight_hw_on(void)
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{
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__tcu_start_counter(BACKLIGHT_PWM);
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__tcu_enable_pwm_output(BACKLIGHT_PWM);
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}
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static void setbacklight_hw_off(void)
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{
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__tcu_disable_pwm_output(BACKLIGHT_PWM);
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__tcu_stop_counter(BACKLIGHT_PWM);
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}
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bool backlight_hw_init(void)
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{
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__gpio_as_pwm(BACKLIGHT_PWM);
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__tcu_start_timer_clock(BACKLIGHT_PWM);
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__tcu_stop_counter(BACKLIGHT_PWM);
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__tcu_init_pwm_output_low(BACKLIGHT_PWM);
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__tcu_set_pwm_output_shutdown_graceful(BACKLIGHT_PWM);
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__tcu_disable_pwm_output(BACKLIGHT_PWM);
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__tcu_select_extalclk(BACKLIGHT_PWM); /* 12 MHz */
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__tcu_select_clk_div64(BACKLIGHT_PWM); /* 187.5 kHz */
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__tcu_mask_half_match_irq(BACKLIGHT_PWM);
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__tcu_mask_full_match_irq(BACKLIGHT_PWM);
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__tcu_set_count(BACKLIGHT_PWM, 0);
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__tcu_set_half_data(BACKLIGHT_PWM, 0);
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__tcu_set_full_data(BACKLIGHT_PWM, 256);
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return true;
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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 */
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#endif
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setbacklight_hw_on();
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}
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void backlight_hw_off(void)
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{
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setbacklight_hw_off();
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#ifdef HAVE_LCD_ENABLE
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lcd_enable(false); /* power off lcd */
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#endif
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}
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#ifdef HAVE_BACKLIGHT_BRIGHTNESS
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void backlight_hw_brightness(int brightness)
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{
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set_backlight(brightness);
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}
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#endif
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#ifdef HAVE_LCD_SLEEP
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/* Turn off LED supply */
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void _backlight_lcd_sleep(void)
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{
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backlight_hw_off();
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}
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#endif
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