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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2013 Andrew Ryabinin
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "system.h"
#include "pcm1792.h"
#include "config.h"
#include "audio.h"
#include "audiohw.h"
/* pcm1792 registers initial values */
#define REG18_INIT_VALUE (PCM1792_ATLD_OFF|PCM1792_FMT_16_I2S| \
PCM1792_DMF_DISABLE|PCM1792_DME_OFF)
#define REG19_INIT_VALUE (PCM1792_REV_ON|PCM1792_ATS_DIV1| \
PCM1792_OPE_ON|PCM1792_DFMS_MONO| \
PCM1792_FLT_SHARP|PCM1792_INZD_OFF)
#define REG20_INIT_VALUE (PCM1792_SRST_NORMAL|PCM1792_DSD_OFF|\
PCM1792_DFTH_ENABLE|PCM1792_STEREO|\
PCM1792_OS_64)
#define REG21_INIT_VALUE (PCM1792_DZ_DISABLE|PCM1792_PCMZ_ON)
static void pcm1792_write_reg(const int reg, const unsigned int value)
{
int i;
pcm1792_set_ml_dir(0);
pcm1792_set_md(1);
pcm1792_set_mc(0);
pcm1792_set_ml(0);
for (i = (1<<15); i; i >>= 1) {
udelay(40);
pcm1792_set_mc(0);
if ((reg|value) & i) {
pcm1792_set_md(1);
} else {
pcm1792_set_md(0);
}
udelay(40);
pcm1792_set_mc(1);
}
udelay(40);
pcm1792_set_ml(1);
pcm1792_set_mc(0);
udelay(130);
pcm1792_set_md(1);
}
static int vol_tenthdb2hw(const int tdb)
{
if (tdb < PCM1792_VOLUME_MIN) {
return 0;
} else if (tdb > PCM1792_VOLUME_MAX) {
return 0xff;
} else {
return (tdb/5+0xff);
}
}
void audiohw_init(void)
{
pcm1792_write_reg(PCM1792_REG(18), REG18_INIT_VALUE);
pcm1792_write_reg(PCM1792_REG(19), REG19_INIT_VALUE);
pcm1792_write_reg(PCM1792_REG(20), REG20_INIT_VALUE);
pcm1792_write_reg(PCM1792_REG(21), REG21_INIT_VALUE);
/* Left & Right volumes */
pcm1792_write_reg(PCM1792_REG(16), 0xff);
pcm1792_write_reg(PCM1792_REG(17), 0xff);
}
void audiohw_mute(void)
{
pcm1792_write_reg(PCM1792_REG(18), REG18_INIT_VALUE|PCM1792_MUTE_ON);
}
void audiohw_unmute(void)
{
pcm1792_write_reg(PCM1792_REG(18), REG18_INIT_VALUE);
}
void audiohw_preinit(void)
{
}
void audiohw_set_frequency(int fsel)
{
(void)fsel;
}
void audiohw_set_volume(int vol_l, int vol_r)
{
pcm1792_write_reg(PCM1792_REG(16), vol_tenthdb2hw(vol_l));
pcm1792_write_reg(PCM1792_REG(17), vol_tenthdb2hw(vol_r));
}
void audiohw_set_filter_roll_off(int value)
{
if (value == 0) {
pcm1792_write_reg(PCM1792_REG(19),
REG19_INIT_VALUE
|PCM1792_FLT_SHARP);
} else {
pcm1792_write_reg(PCM1792_REG(19),
REG19_INIT_VALUE
|PCM1792_FLT_SLOW);
}
}
|
