194 lines
6 KiB
C
194 lines
6 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) 2006 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 "system.h"
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#include "kernel.h"
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#include "backlight.h"
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#include "mc13783.h"
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#include "backlight-target.h"
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#include "lcd.h"
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#ifdef HAVE_BACKLIGHT_BRIGHTNESS
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/* Table that uses combinations of current level and pwm fraction to get
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* as many uniquely-visible brightness levels as possible. The lowest current
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* level for any average current is used even though many combinations give
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* duplicate values. Current (I) values are in mA. */
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static const struct
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{
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unsigned char md;
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unsigned char pwm;
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} led_md_pwm_table[] =
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{
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/* I-level PWM(x/15) I-Avg */
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{ 0, 0 }, /* 0 0 0.0 */
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{ 1, 1 }, /* 3 1 0.2 */
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{ 1, 2 }, /* 3 2 0.4 */
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{ 1, 3 }, /* 3 3 0.6 */
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{ 1, 4 }, /* 3 4 0.8 */
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{ 1, 5 }, /* 3 5 1.0 */
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{ 1, 6 }, /* 3 6 1.2 */
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{ 1, 7 }, /* 3 7 1.4 */
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{ 1, 8 }, /* 3 8 1.6 */
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{ 1, 9 }, /* 3 9 1.8 */
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{ 1, 10 }, /* 3 10 2.0 */
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{ 1, 11 }, /* 3 11 2.2 */
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{ 1, 12 }, /* 3 12 2.4 */ /* default */
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{ 1, 13 }, /* 3 13 2.6 */
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{ 1, 14 }, /* 3 14 2.8 */
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{ 1, 15 }, /* 3 15 3.0 */
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{ 2, 9 }, /* 6 9 3.6 */
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{ 2, 10 }, /* 6 10 4.0 */
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{ 2, 11 }, /* 6 11 4.4 */
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{ 2, 12 }, /* 6 12 4.8 */
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{ 2, 13 }, /* 6 13 5.2 */
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{ 2, 14 }, /* 6 14 5.6 */
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{ 2, 15 }, /* 6 15 6.0 */
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{ 3, 11 }, /* 9 11 6.6 */
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{ 3, 12 }, /* 9 12 7.2 */
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/* Anything higher is just too much */
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};
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#endif /* HAVE_BACKLIGHT_BRIGHTNESS */
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/* Bits always combined with ramping bits */
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#define MC13783_LED_CONTROL0_BITS \
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(MC13783_BOOSTEN | MC13783_ABMODE_MONCH_LEDMD1234 | \
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MC13783_ABREF_400MV)
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static bool backlight_on_status = true; /* Is on or off? */
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static uint32_t backlight_pwm_bits; /* Final PWM setting for fade-in */
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/* Backlight ramping settings */
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static uint32_t led_ramp_mask = MC13783_LEDMDRAMPDOWN | MC13783_LEDMDRAMPUP;
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bool _backlight_init(void)
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{
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/* Set default LED register value */
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mc13783_write(MC13783_LED_CONTROL0,
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MC13783_LED_CONTROL0_BITS | MC13783_LEDEN);
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#ifdef HAVE_BACKLIGHT_BRIGHTNESS
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/* Our PWM and I-Level is different than retailos (but same apparent
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* brightness), so init to our default. */
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_backlight_set_brightness(DEFAULT_BRIGHTNESS_SETTING);
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#else
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/* Use default PWM */
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backlight_pwm_bits = mc13783_read(MC13783_LED_CONTROL2) & MC13783_LEDMDDC;
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#endif
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return true;
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}
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void backlight_set_fade_out(bool value)
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{
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if (value)
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led_ramp_mask |= MC13783_LEDMDRAMPDOWN;
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else
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led_ramp_mask &= ~MC13783_LEDMDRAMPDOWN;
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}
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void backlight_set_fade_in(bool value)
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{
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if (value)
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led_ramp_mask |= MC13783_LEDMDRAMPUP;
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else
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led_ramp_mask &= ~MC13783_LEDMDRAMPUP;
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}
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void _backlight_on(void)
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{
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static const char regs[2] =
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{
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MC13783_LED_CONTROL0,
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MC13783_LED_CONTROL2
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};
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uint32_t data[2];
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#ifdef HAVE_LCD_ENABLE
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lcd_enable(true);
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#endif
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/* Set/clear LEDRAMPUP bit, clear LEDRAMPDOWN bit,
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* Ensure LED supply is on. */
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data[0] = MC13783_LED_CONTROL0_BITS | MC13783_LEDEN;
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if (!backlight_on_status)
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data[0] |= led_ramp_mask & MC13783_LEDMDRAMPUP;
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backlight_on_status = true;
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/* Specify final PWM setting */
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data[1] = mc13783_read(MC13783_LED_CONTROL2);
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if (data[1] != MC13783_DATA_ERROR)
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{
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data[1] &= ~MC13783_LEDMDDC;
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data[1] |= backlight_pwm_bits;
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/* Write regs within 30us of each other (requires single xfer) */
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mc13783_write_regs(regs, data, 2);
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}
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}
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void _backlight_off(void)
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{
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uint32_t ctrl0 = MC13783_LED_CONTROL0_BITS | MC13783_LEDEN;
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if (backlight_on_status)
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ctrl0 |= led_ramp_mask & MC13783_LEDMDRAMPDOWN;
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backlight_on_status = false;
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/* Set/clear LEDRAMPDOWN bit, clear LEDRAMPUP bit */
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mc13783_write(MC13783_LED_CONTROL0, ctrl0);
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/* Wait 100us - 500ms */
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sleep(HZ/100);
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/* Write final PWM setting */
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mc13783_write_masked(MC13783_LED_CONTROL2,
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0 << MC13783_LEDMDDC_POS,
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MC13783_LEDMDDC);
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}
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#ifdef HAVE_BACKLIGHT_BRIGHTNESS
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/* Assumes that the backlight has been initialized - parameter should
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* already be range-checked in public interface. */
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void _backlight_set_brightness(int brightness)
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{
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uint32_t md = led_md_pwm_table[brightness].md;
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backlight_pwm_bits = backlight_on_status ?
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(led_md_pwm_table[brightness].pwm << MC13783_LEDMDDC_POS) : 0;
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mc13783_write_masked(MC13783_LED_CONTROL2,
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(md << MC13783_LEDMD_POS) | backlight_pwm_bits,
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MC13783_LEDMD | MC13783_LEDMDDC);
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}
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#endif /* HAVE_BACKLIGHT_BRIGHTNESS */
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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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mc13783_clear(MC13783_LED_CONTROL0, MC13783_LEDEN);
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}
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#endif
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