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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-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)
{
const struct cx18_card_audio_input *in;
struct v4l2_routing route;
u32 val;
int err;
/* Determine which input to use */
if (test_bit(CX18_F_I_RADIO_USER, &cx->i_flags))
in = &cx->card->radio_input;
else
in = &cx->card->audio_inputs[cx->audio_input];
/* handle muxer chips */
route.input = in->muxer_input;
route.output = 0;
v4l2_subdev_call(cx->sd_extmux, audio, s_routing, &route);
route.input = in->audio_input;
err = cx18_call_hw_err(cx, cx->card->hw_audio_ctrl,
audio, s_routing, &route);
if (err)
return err;
/* FIXME - this internal mux should be abstracted to a subdev */
val = cx18_read_reg(cx, CX18_AUDIO_ENABLE) & ~0x30;
val |= (in->audio_input > CX18_AV_AUDIO_SERIAL2) ? 0x20 :
(in->audio_input << 4);
cx18_write_reg_expect(cx, val | 0xb00, CX18_AUDIO_ENABLE, val, 0x30);
return 0;
}
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