134 lines
3.5 KiB
C
134 lines
3.5 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) 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 "pcm1792.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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/* pcm1792 registers initial values */
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#define REG18_INIT_VALUE (PCM1792_ATLD_OFF|PCM1792_FMT_16_I2S| \
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PCM1792_DMF_DISABLE|PCM1792_DME_OFF)
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#define REG19_INIT_VALUE (PCM1792_REV_ON|PCM1792_ATS_DIV1| \
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PCM1792_OPE_ON|PCM1792_DFMS_MONO| \
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PCM1792_FLT_SHARP|PCM1792_INZD_OFF)
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#define REG20_INIT_VALUE (PCM1792_SRST_NORMAL|PCM1792_DSD_OFF|\
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PCM1792_DFTH_ENABLE|PCM1792_STEREO|\
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PCM1792_OS_64)
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#define REG21_INIT_VALUE (PCM1792_DZ_DISABLE|PCM1792_PCMZ_ON)
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static void pcm1792_write_reg(const int reg, const unsigned int value)
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{
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int i;
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pcm1792_set_ml_dir(0);
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pcm1792_set_md(1);
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pcm1792_set_mc(0);
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pcm1792_set_ml(0);
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for (i = (1<<15); i; i >>= 1) {
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udelay(40);
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pcm1792_set_mc(0);
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if ((reg|value) & i) {
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pcm1792_set_md(1);
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} else {
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pcm1792_set_md(0);
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}
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udelay(40);
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pcm1792_set_mc(1);
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}
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udelay(40);
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pcm1792_set_ml(1);
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pcm1792_set_mc(0);
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udelay(130);
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pcm1792_set_md(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 < PCM1792_VOLUME_MIN) {
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return 0;
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} else if (tdb > PCM1792_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 audiohw_init(void)
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{
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pcm1792_write_reg(PCM1792_REG(18), REG18_INIT_VALUE);
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pcm1792_write_reg(PCM1792_REG(19), REG19_INIT_VALUE);
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pcm1792_write_reg(PCM1792_REG(20), REG20_INIT_VALUE);
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pcm1792_write_reg(PCM1792_REG(21), REG21_INIT_VALUE);
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/* Left & Right volumes */
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pcm1792_write_reg(PCM1792_REG(16), 0xff);
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pcm1792_write_reg(PCM1792_REG(17), 0xff);
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}
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void audiohw_mute(void)
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{
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pcm1792_write_reg(PCM1792_REG(18), REG18_INIT_VALUE|PCM1792_MUTE_ON);
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}
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void audiohw_unmute(void)
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{
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pcm1792_write_reg(PCM1792_REG(18), REG18_INIT_VALUE);
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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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pcm1792_write_reg(PCM1792_REG(16), vol_tenthdb2hw(vol_l));
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pcm1792_write_reg(PCM1792_REG(17), vol_tenthdb2hw(vol_r));
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}
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void audiohw_set_filter_roll_off(int value)
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{
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if (value == 0) {
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pcm1792_write_reg(PCM1792_REG(19),
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REG19_INIT_VALUE
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|PCM1792_FLT_SHARP);
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} else {
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pcm1792_write_reg(PCM1792_REG(19),
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REG19_INIT_VALUE
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|PCM1792_FLT_SLOW);
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}
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}
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