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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Driver for TSC2100 audio codec
*
* Copyright (c) 2008 Jonathan Gordon
*
* 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 "cpu.h"
#include "debug.h"
#include "system.h"
#include "audio.h"
#include "audiohw.h"
#include "sound.h"
#include "tsc2100.h"
static bool is_muted = false;
/* convert tenth of dB volume to volume register value */
static int vol_tenthdb2hw(int db)
{
/* 0 to -63.0dB in 1dB steps, tsc2100 can goto -63.5 in 0.5dB steps */
if (db <= -640) {
return 0x7E;
} else if (db >= 0) {
return 0x00;
} else {
return(-((db)/5));
}
}
void audiohw_init(void)
{
short val = tsc2100_readreg(TSAC4_PAGE, TSAC4_ADDRESS);
/* disable DAC PGA soft-stepping */
val |= TSAC4_DASTDP;
tsc2100_writereg(TSAC4_PAGE, TSAC4_ADDRESS, val);
}
static void audiohw_mute(bool mute)
{
short vol = tsc2100_readreg(TSDACGAIN_PAGE, TSDACGAIN_ADDRESS);
/* left mute bit == 1<<15
right mute bit == 1<<7
*/
if (mute)
{
vol |= (1<<15)|(1<<7);
} else
{
vol &= ~((1<<15)|(1<<7));
}
is_muted = mute;
tsc2100_writereg(TSDACGAIN_PAGE, TSDACGAIN_ADDRESS, vol);
}
void audiohw_postinit(void)
{
audiohw_mute(false);
}
void audiohw_set_volume(int vol_l, int vol_r)
{
vol_l = vol_tenthdb2hw(vol_l);
vol_r = vol_tenthdb2hw(vol_r);
tsc2100_writereg(TSDACGAIN_PAGE, TSDACGAIN_ADDRESS,
(short)((vol_l<<8) | vol_r) );
}
void audiohw_close(void)
{
/* mute headphones */
audiohw_mute(true);
}
void audiohw_set_frequency(int fsel)
{
int reg_val;
reg_val = tsc2100_readreg(CONTROL_PAGE2, TSAC1_ADDRESS);
reg_val &= ~(0x07<<3);
switch(fsel)
{
case HW_FREQ_8:
reg_val |= (0x06<<3);
break;
case HW_FREQ_11:
reg_val |= (0x04<<3);
break;
case HW_FREQ_22:
reg_val |= (0x02<<3);
break;
case HW_FREQ_44:
default:
break;
}
tsc2100_writereg(CONTROL_PAGE2, TSAC1_ADDRESS, reg_val);
}
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