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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 "df1704.h"
#include "config.h"
#include "audio.h"
#include "audiohw.h"
static void df1704_write_reg(const int reg, const unsigned int value)
{
int i;
df1704_set_ml_dir(0);
df1704_set_ml(1);
df1704_set_md(1);
df1704_set_mc(1);
for (i = (1<<15); i; i >>= 1) {
udelay(40);
df1704_set_mc(0);
if ((reg|value) & i) {
df1704_set_md(1);
} else {
df1704_set_md(0);
}
udelay(40);
df1704_set_mc(1);
}
df1704_set_ml(0);
udelay(130);
df1704_set_ml(1);
udelay(130);
df1704_set_ml_dir(1);
}
static int vol_tenthdb2hw(const int tdb)
{
if (tdb < DF1704_VOLUME_MIN) {
return 0;
} else if (tdb > DF1704_VOLUME_MAX) {
return 0xff;
} else {
return (tdb/5+0xff);
}
}
void audiohw_init(void)
{
df1704_write_reg(DF1704_MODE(2),
DF1704_OW_24 |
DF1704_IW_16_I2S |
DF1704_DEM_OFF |
DF1704_MUTE_OFF);
df1704_write_reg(DF1704_MODE(3),
DF1704_CKO_HALF |
DF1704_SRO_SHARP|
DF1704_LRP_H |
DF1704_I2S_ON);
}
void audiohw_mute(void)
{
df1704_write_reg(DF1704_MODE(2),
DF1704_OW_24 |
DF1704_IW_16_I2S |
DF1704_DEM_OFF |
DF1704_MUTE_ON);
}
void audiohw_unmute(void)
{
df1704_write_reg(DF1704_MODE(2),
DF1704_OW_24 |
DF1704_IW_16_I2S |
DF1704_DEM_OFF |
DF1704_MUTE_OFF);
}
void audiohw_preinit(void)
{
}
void audiohw_set_frequency(int fsel)
{
(void)fsel;
}
void audiohw_set_volume(int vol_l, int vol_r)
{
df1704_write_reg(DF1704_MODE(0), DF1704_LDL_ON|vol_tenthdb2hw(vol_l));
df1704_write_reg(DF1704_MODE(1), DF1704_LDR_ON|vol_tenthdb2hw(vol_r));
}
void audiohw_set_filter_roll_off(int value)
{
int mode3_val = DF1704_CKO_HALF |
DF1704_LRP_H |
DF1704_I2S_ON;
if (value == 0) {
mode3_val |= DF1704_SRO_SHARP;
} else {
mode3_val |= DF1704_SRO_SLOW;
}
df1704_write_reg(DF1704_MODE(3), mode3_val);
}
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