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-cards.h"
27#include "cx18-audio.h"
28
29#define CX18_AUDIO_ENABLE    0xc72014
30#define CX18_AI1_MUX_MASK    0x30
31#define CX18_AI1_MUX_I2S1    0x00
32#define CX18_AI1_MUX_I2S2    0x10
33#define CX18_AI1_MUX_843_I2S 0x20
34
35/* Selects the audio input and output according to the current
36   settings. */
37int cx18_audio_set_io(struct cx18 *cx)
38{
39	const struct cx18_card_audio_input *in;
40	u32 u, v;
41	int err;
42
43	/* Determine which input to use */
44	if (test_bit(CX18_F_I_RADIO_USER, &cx->i_flags))
45		in = &cx->card->radio_input;
46	else
47		in = &cx->card->audio_inputs[cx->audio_input];
48
49	/* handle muxer chips */
50	v4l2_subdev_call(cx->sd_extmux, audio, s_routing,
51			 (u32) in->muxer_input, 0, 0);
52
53	err = cx18_call_hw_err(cx, cx->card->hw_audio_ctrl,
54			       audio, s_routing, in->audio_input, 0, 0);
55	if (err)
56		return err;
57
58	/* FIXME - this internal mux should be abstracted to a subdev */
59	u = cx18_read_reg(cx, CX18_AUDIO_ENABLE);
60	v = u & ~CX18_AI1_MUX_MASK;
61	switch (in->audio_input) {
62	case CX18_AV_AUDIO_SERIAL1:
63		v |= CX18_AI1_MUX_I2S1;
64		break;
65	case CX18_AV_AUDIO_SERIAL2:
66		v |= CX18_AI1_MUX_I2S2;
67		break;
68	default:
69		v |= CX18_AI1_MUX_843_I2S;
70		break;
71	}
72	if (v == u) {
73		/* force a toggle of some AI1 MUX control bits */
74		u &= ~CX18_AI1_MUX_MASK;
75		switch (in->audio_input) {
76		case CX18_AV_AUDIO_SERIAL1:
77			u |= CX18_AI1_MUX_843_I2S;
78			break;
79		case CX18_AV_AUDIO_SERIAL2:
80			u |= CX18_AI1_MUX_843_I2S;
81			break;
82		default:
83			u |= CX18_AI1_MUX_I2S1;
84			break;
85		}
86		cx18_write_reg_expect(cx, u | 0xb00, CX18_AUDIO_ENABLE,
87				      u, CX18_AI1_MUX_MASK);
88	}
89	cx18_write_reg_expect(cx, v | 0xb00, CX18_AUDIO_ENABLE,
90			      v, CX18_AI1_MUX_MASK);
91	return 0;
92}
93