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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 Magnus Holmgren
* Copyright (C) 2012 Michael Sevakis
*
* 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 "rbcodecconfig.h"
#include "platform.h"
#include "dsp-util.h"
#include "fixedpoint.h"
#include "fracmul.h"
#include "dsp_proc_entry.h"
#include "pga.h"
/* Implemented here or in target assembly code */
void pga_process(struct dsp_proc_entry *this, struct dsp_buffer **buf_p);
#define DEFAULT_PGA_GAIN (PGA_UNITY >> 1) /* s8.23 format */
static struct pga_data
{
int32_t gain; /* 00h: Final gain in s8.23 format */
uint32_t enabled; /* Mask of enabled gains */
int32_t gains[PGA_NUM_GAINS]; /* Individual gains in s7.24 format */
} pga_data =
{
.gain = DEFAULT_PGA_GAIN,
.enabled = 0,
.gains[0 ... PGA_NUM_GAINS-1] = PGA_UNITY,
};
/* Combine all gains to a global gain and enable/disable the amplifier if
the overall gain is not unity/unity */
static void pga_update(void)
{
int32_t gain = PGA_UNITY;
/* Multiply all gains with one another to get overall amp gain */
for (int i = 0; i < PGA_NUM_GAINS; i++)
{
if (pga_data.enabled & BIT_N(i)) /* Only enabled gains factor in */
gain = fp_mul(gain, pga_data.gains[i], 24);
}
gain >>= 1; /* s7.24 -> s8.23 format */
if (gain == pga_data.gain)
return;
struct dsp_config *dsp = dsp_get_config(CODEC_IDX_AUDIO);
pga_data.gain = gain;
dsp_proc_enable(dsp, DSP_PROC_PGA, gain != DEFAULT_PGA_GAIN);
dsp_proc_activate(dsp, DSP_PROC_PGA, true);
}
/** Amp controls **/
/* Set a particular gain value - doesn't have to be enabled */
void pga_set_gain(enum pga_gain_ids id, int32_t value)
{
if (value == pga_data.gains[id])
return;
pga_data.gains[id] = value;
if (BIT_N(id) & pga_data.enabled)
pga_update();
}
/* Enable or disable the specified gain stage */
void pga_enable_gain(enum pga_gain_ids id, bool enable)
{
uint32_t bit = BIT_N(id);
if (enable != !(pga_data.enabled & bit))
return;
pga_data.enabled ^= bit;
pga_update();
}
/** DSP interface **/
#if !defined(CPU_COLDFIRE) && !defined(CPU_ARM)
/* Apply a constant gain to the samples (e.g., for ReplayGain). */
void pga_process(struct dsp_proc_entry *this, struct dsp_buffer **buf_p)
{
int32_t gain = ((struct pga_data *)this->data)->gain;
struct dsp_buffer *buf = *buf_p;
unsigned int channels = buf->format.num_channels;
for (unsigned int ch = 0; ch < channels; ch++)
{
int32_t *d = buf->p32[ch];
int count = buf->remcount;
for (int i = 0; i < count; i++)
d[i] = FRACMUL_SHL(d[i], gain, 8);
}
(void)this;
}
#endif /* CPU */
/* DSP message hook */
static intptr_t pga_configure(struct dsp_proc_entry *this,
struct dsp_config *dsp,
unsigned int setting,
intptr_t value)
{
switch (setting)
{
case DSP_PROC_INIT:
if (value != 0)
break; /* Already enabled */
this->data = (intptr_t)&pga_data;
this->process = pga_process;
break;
}
return 0;
(void)dsp;
}
/* Database entry */
DSP_PROC_DB_ENTRY(PGA,
pga_configure);
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