116 lines
2.9 KiB
C
116 lines
2.9 KiB
C
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/***************************************************************************
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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 Andrew Ryabinin
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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 "system.h"
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#include "df1704.h"
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#include "config.h"
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#include "audio.h"
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#include "audiohw.h"
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static void df1704_write_reg(const int reg, const unsigned int value)
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{
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int i;
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df1704_set_ml_dir(0);
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df1704_set_ml(1);
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df1704_set_md(1);
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df1704_set_mc(1);
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for (i = (1<<15); i; i >>= 1) {
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udelay(40);
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df1704_set_mc(0);
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if ((reg|value) & i) {
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df1704_set_md(1);
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} else {
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df1704_set_md(0);
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}
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udelay(40);
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df1704_set_mc(1);
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}
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df1704_set_ml(0);
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udelay(130);
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df1704_set_ml(1);
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udelay(130);
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df1704_set_ml_dir(1);
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}
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static int vol_tenthdb2hw(const int tdb)
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{
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if (tdb < DF1704_VOLUME_MIN) {
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return 0;
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} else if (tdb > DF1704_VOLUME_MAX) {
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return 0xff;
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} else {
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return (tdb/5+0xff);
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}
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}
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void df1704_init(void)
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{
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df1704_write_reg(DF1704_MODE(2),
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DF1704_OW_24 |
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DF1704_IW_16_I2S |
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DF1704_DEM_OFF |
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DF1704_MUTE_OFF);
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df1704_write_reg(DF1704_MODE(3),
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DF1704_CKO_HALF |
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DF1704_SRO_SHARP|
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DF1704_LRP_H |
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DF1704_I2S_ON);
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}
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void df1704_mute(void)
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{
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df1704_write_reg(DF1704_MODE(2),
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DF1704_OW_24 |
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DF1704_IW_16_I2S |
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DF1704_DEM_OFF |
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DF1704_MUTE_ON);
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}
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void df1704_unmute(void)
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{
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df1704_write_reg(DF1704_MODE(2),
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DF1704_OW_24 |
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DF1704_IW_16_I2S |
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DF1704_DEM_OFF |
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DF1704_MUTE_OFF);
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}
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void audiohw_preinit(void)
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{
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}
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void audiohw_set_frequency(int fsel)
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{
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(void)fsel;
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}
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void audiohw_set_volume(int vol_l, int vol_r)
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{
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df1704_write_reg(DF1704_MODE(0), DF1704_LDL_ON|vol_tenthdb2hw(vol_l));
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df1704_write_reg(DF1704_MODE(1), DF1704_LDR_ON|vol_tenthdb2hw(vol_r));
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}
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