2 * cx18 audio-related functions
4 * Derived from ivtv-audio.c
6 * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
24 #include "cx18-driver.h"
26 #include "cx18-cards.h"
27 #include "cx18-audio.h"
29 /* Selects the audio input and output according to the current
31 int cx18_audio_set_io(struct cx18 *cx)
33 struct v4l2_routing route;
37 /* Determine which input to use */
38 if (test_bit(CX18_F_I_RADIO_USER, &cx->i_flags)) {
39 audio_input = cx->card->radio_input.audio_input;
40 mux_input = cx->card->radio_input.muxer_input;
43 cx->card->audio_inputs[cx->audio_input].audio_input;
45 cx->card->audio_inputs[cx->audio_input].muxer_input;
48 /* handle muxer chips */
49 route.input = mux_input;
51 cx18_i2c_hw(cx, cx->card->hw_muxer, VIDIOC_INT_S_AUDIO_ROUTING, &route);
53 route.input = audio_input;
54 return cx18_i2c_hw(cx, cx->card->hw_audio_ctrl,
55 VIDIOC_INT_S_AUDIO_ROUTING, &route);
58 void cx18_audio_set_route(struct cx18 *cx, struct v4l2_routing *route)
60 cx18_i2c_hw(cx, cx->card->hw_audio_ctrl,
61 VIDIOC_INT_S_AUDIO_ROUTING, route);
64 void cx18_audio_set_audio_clock_freq(struct cx18 *cx, u8 freq)
66 static u32 freqs[3] = { 44100, 48000, 32000 };
68 /* The audio clock of the digitizer must match the codec sample
69 rate otherwise you get some very strange effects. */
72 cx18_call_i2c_clients(cx, VIDIOC_INT_AUDIO_CLOCK_FREQ, &freqs[freq]);