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/*
* cx18 audio-related functions
*
* Derived from ivtv-audio.c
*
* Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
*
* 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 program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
* 02111-1307 USA
*/
#include "cx18-driver.h"
#include "cx18-io.h"
#include "cx18-i2c.h"
#include "cx18-cards.h"
#include "cx18-audio.h"
#define CX18_AUDIO_ENABLE 0xc72014
/* Selects the audio input and output according to the current
settings. */
int cx18_audio_set_io(struct cx18 *cx)
{
struct v4l2_routing route;
u32 audio_input;
u32 val;
int mux_input;
int err;
/* Determine which input to use */
if (test_bit(CX18_F_I_RADIO_USER, &cx->i_flags)) {
audio_input = cx->card->radio_input.audio_input;
mux_input = cx->card->radio_input.muxer_input;
} else {
audio_input =
cx->card->audio_inputs[cx->audio_input].audio_input;
mux_input =
cx->card->audio_inputs[cx->audio_input].muxer_input;
}
/* handle muxer chips */
route.input = mux_input;
route.output = 0;
cx18_i2c_hw(cx, cx->card->hw_muxer, VIDIOC_INT_S_AUDIO_ROUTING, &route);
route.input = audio_input;
err = cx18_i2c_hw(cx, cx->card->hw_audio_ctrl,
VIDIOC_INT_S_AUDIO_ROUTING, &route);
if (err)
return err;
val = cx18_read_reg(cx, CX18_AUDIO_ENABLE) & ~0x30;
val |= (audio_input > CX18_AV_AUDIO_SERIAL2) ? 0x20 :
(audio_input << 4);
cx18_write_reg_expect(cx, val | 0xb00, CX18_AUDIO_ENABLE, val, 0x30);
return 0;
}
void cx18_audio_set_route(struct cx18 *cx, struct v4l2_routing *route)
{
cx18_i2c_hw(cx, cx->card->hw_audio_ctrl,
VIDIOC_INT_S_AUDIO_ROUTING, route);
}
void cx18_audio_set_audio_clock_freq(struct cx18 *cx, u8 freq)
{
static u32 freqs[3] = { 44100, 48000, 32000 };
/* The audio clock of the digitizer must match the codec sample
rate otherwise you get some very strange effects. */
if (freq > 2)
return;
cx18_call_i2c_clients(cx, VIDIOC_INT_AUDIO_CLOCK_FREQ, &freqs[freq]);
}
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