88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
/*
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* cx18 audio-related functions
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*
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* Derived from ivtv-audio.c
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*
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* Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include "cx18-driver.h"
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#include "cx18-io.h"
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#include "cx18-cards.h"
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#include "cx18-audio.h"
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#define CX18_AUDIO_ENABLE 0xc72014
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#define CX18_AI1_MUX_MASK 0x30
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#define CX18_AI1_MUX_I2S1 0x00
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#define CX18_AI1_MUX_I2S2 0x10
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#define CX18_AI1_MUX_843_I2S 0x20
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/* Selects the audio input and output according to the current
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settings. */
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int cx18_audio_set_io(struct cx18 *cx)
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{
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const struct cx18_card_audio_input *in;
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u32 u, v;
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int err;
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/* Determine which input to use */
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if (test_bit(CX18_F_I_RADIO_USER, &cx->i_flags))
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in = &cx->card->radio_input;
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else
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in = &cx->card->audio_inputs[cx->audio_input];
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/* handle muxer chips */
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v4l2_subdev_call(cx->sd_extmux, audio, s_routing,
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(u32) in->muxer_input, 0, 0);
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err = cx18_call_hw_err(cx, cx->card->hw_audio_ctrl,
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audio, s_routing, in->audio_input, 0, 0);
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if (err)
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return err;
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/* FIXME - this internal mux should be abstracted to a subdev */
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u = cx18_read_reg(cx, CX18_AUDIO_ENABLE);
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v = u & ~CX18_AI1_MUX_MASK;
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switch (in->audio_input) {
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case CX18_AV_AUDIO_SERIAL1:
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v |= CX18_AI1_MUX_I2S1;
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break;
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case CX18_AV_AUDIO_SERIAL2:
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v |= CX18_AI1_MUX_I2S2;
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break;
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default:
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v |= CX18_AI1_MUX_843_I2S;
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break;
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}
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if (v == u) {
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/* force a toggle of some AI1 MUX control bits */
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u &= ~CX18_AI1_MUX_MASK;
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switch (in->audio_input) {
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case CX18_AV_AUDIO_SERIAL1:
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u |= CX18_AI1_MUX_843_I2S;
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break;
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case CX18_AV_AUDIO_SERIAL2:
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u |= CX18_AI1_MUX_843_I2S;
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break;
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default:
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u |= CX18_AI1_MUX_I2S1;
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break;
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}
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cx18_write_reg_expect(cx, u | 0xb00, CX18_AUDIO_ENABLE,
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u, CX18_AI1_MUX_MASK);
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}
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cx18_write_reg_expect(cx, v | 0xb00, CX18_AUDIO_ENABLE,
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v, CX18_AI1_MUX_MASK);
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return 0;
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}
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