1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *  cx18 audio-related functions
4 *
5 *  Derived from ivtv-audio.c
6 *
7 *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
8 */
9
10#include "cx18-driver.h"
11#include "cx18-io.h"
12#include "cx18-cards.h"
13#include "cx18-audio.h"
14
15#define CX18_AUDIO_ENABLE    0xc72014
16#define CX18_AI1_MUX_MASK    0x30
17#define CX18_AI1_MUX_I2S1    0x00
18#define CX18_AI1_MUX_I2S2    0x10
19#define CX18_AI1_MUX_843_I2S 0x20
20
21/* Selects the audio input and output according to the current
22   settings. */
23int cx18_audio_set_io(struct cx18 *cx)
24{
25	const struct cx18_card_audio_input *in;
26	u32 u, v;
27	int err;
28
29	/* Determine which input to use */
30	if (test_bit(CX18_F_I_RADIO_USER, &cx->i_flags))
31		in = &cx->card->radio_input;
32	else
33		in = &cx->card->audio_inputs[cx->audio_input];
34
35	/* handle muxer chips */
36	v4l2_subdev_call(cx->sd_extmux, audio, s_routing,
37			 (u32) in->muxer_input, 0, 0);
38
39	err = cx18_call_hw_err(cx, cx->card->hw_audio_ctrl,
40			       audio, s_routing, in->audio_input, 0, 0);
41	if (err)
42		return err;
43
44	/* FIXME - this internal mux should be abstracted to a subdev */
45	u = cx18_read_reg(cx, CX18_AUDIO_ENABLE);
46	v = u & ~CX18_AI1_MUX_MASK;
47	switch (in->audio_input) {
48	case CX18_AV_AUDIO_SERIAL1:
49		v |= CX18_AI1_MUX_I2S1;
50		break;
51	case CX18_AV_AUDIO_SERIAL2:
52		v |= CX18_AI1_MUX_I2S2;
53		break;
54	default:
55		v |= CX18_AI1_MUX_843_I2S;
56		break;
57	}
58	if (v == u) {
59		/* force a toggle of some AI1 MUX control bits */
60		u &= ~CX18_AI1_MUX_MASK;
61		switch (in->audio_input) {
62		case CX18_AV_AUDIO_SERIAL1:
63			u |= CX18_AI1_MUX_843_I2S;
64			break;
65		case CX18_AV_AUDIO_SERIAL2:
66			u |= CX18_AI1_MUX_843_I2S;
67			break;
68		default:
69			u |= CX18_AI1_MUX_I2S1;
70			break;
71		}
72		cx18_write_reg_expect(cx, u | 0xb00, CX18_AUDIO_ENABLE,
73				      u, CX18_AI1_MUX_MASK);
74	}
75	cx18_write_reg_expect(cx, v | 0xb00, CX18_AUDIO_ENABLE,
76			      v, CX18_AI1_MUX_MASK);
77	return 0;
78}
79