1 /*
2 * cx18 audio-related functions
3 *
4 * Derived from ivtv-audio.c
5 *
6 * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
7 *
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.
12 *
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.
17 *
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
21 * 02111-1307 USA
22 */
23
24 #include "cx18-driver.h"
25 #include "cx18-io.h"
26 #include "cx18-i2c.h"
27 #include "cx18-cards.h"
28 #include "cx18-audio.h"
29
30 #define CX18_AUDIO_ENABLE 0xc72014
31
32 /* Selects the audio input and output according to the current
33 settings. */
cx18_audio_set_io(struct cx18 * cx)34 int cx18_audio_set_io(struct cx18 *cx)
35 {
36 struct v4l2_routing route;
37 u32 audio_input;
38 u32 val;
39 int mux_input;
40 int err;
41
42 /* Determine which input to use */
43 if (test_bit(CX18_F_I_RADIO_USER, &cx->i_flags)) {
44 audio_input = cx->card->radio_input.audio_input;
45 mux_input = cx->card->radio_input.muxer_input;
46 } else {
47 audio_input =
48 cx->card->audio_inputs[cx->audio_input].audio_input;
49 mux_input =
50 cx->card->audio_inputs[cx->audio_input].muxer_input;
51 }
52
53 /* handle muxer chips */
54 route.input = mux_input;
55 route.output = 0;
56 cx18_i2c_hw(cx, cx->card->hw_muxer, VIDIOC_INT_S_AUDIO_ROUTING, &route);
57
58 route.input = audio_input;
59 err = cx18_i2c_hw(cx, cx->card->hw_audio_ctrl,
60 VIDIOC_INT_S_AUDIO_ROUTING, &route);
61 if (err)
62 return err;
63
64 val = cx18_read_reg(cx, CX18_AUDIO_ENABLE) & ~0x30;
65 val |= (audio_input > CX18_AV_AUDIO_SERIAL2) ? 0x20 :
66 (audio_input << 4);
67 cx18_write_reg(cx, val | 0xb00, CX18_AUDIO_ENABLE);
68 cx18_vapi(cx, CX18_APU_RESETAI, 1, 0);
69 return 0;
70 }
71
cx18_audio_set_route(struct cx18 * cx,struct v4l2_routing * route)72 void cx18_audio_set_route(struct cx18 *cx, struct v4l2_routing *route)
73 {
74 cx18_i2c_hw(cx, cx->card->hw_audio_ctrl,
75 VIDIOC_INT_S_AUDIO_ROUTING, route);
76 }
77
cx18_audio_set_audio_clock_freq(struct cx18 * cx,u8 freq)78 void cx18_audio_set_audio_clock_freq(struct cx18 *cx, u8 freq)
79 {
80 static u32 freqs[3] = { 44100, 48000, 32000 };
81
82 /* The audio clock of the digitizer must match the codec sample
83 rate otherwise you get some very strange effects. */
84 if (freq > 2)
85 return;
86 cx18_call_i2c_clients(cx, VIDIOC_INT_AUDIO_CLOCK_FREQ, &freqs[freq]);
87 }
88