1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * ALSA SoC SPDIF DIT driver
4 *
5 *  This driver is used by controllers which can operate in DIT (SPDI/F) where
6 *  no codec is needed.  This file provides stub codec that can be used
7 *  in these configurations. TI DaVinci Audio controller uses this driver.
8 *
9 * Author:      Steve Chen,  <schen@mvista.com>
10 * Copyright:   (C) 2009 MontaVista Software, Inc., <source@mvista.com>
11 * Copyright:   (C) 2009  Texas Instruments, India
12 */
13
14#include <linux/module.h>
15#include <linux/moduleparam.h>
16#include <linux/slab.h>
17#include <sound/soc.h>
18#include <sound/pcm.h>
19#include <sound/initval.h>
20#include <linux/of.h>
21
22#define DRV_NAME "spdif-dit"
23
24#define STUB_RATES	SNDRV_PCM_RATE_8000_192000
25#define STUB_FORMATS	(SNDRV_PCM_FMTBIT_S16_LE | \
26			SNDRV_PCM_FMTBIT_S20_3LE | \
27			SNDRV_PCM_FMTBIT_S24_LE  | \
28			SNDRV_PCM_FMTBIT_S32_LE)
29
30static const struct snd_soc_dapm_widget dit_widgets[] = {
31	SND_SOC_DAPM_OUTPUT("spdif-out"),
32};
33
34static const struct snd_soc_dapm_route dit_routes[] = {
35	{ "spdif-out", NULL, "Playback" },
36};
37
38static struct snd_soc_component_driver soc_codec_spdif_dit = {
39	.dapm_widgets		= dit_widgets,
40	.num_dapm_widgets	= ARRAY_SIZE(dit_widgets),
41	.dapm_routes		= dit_routes,
42	.num_dapm_routes	= ARRAY_SIZE(dit_routes),
43	.idle_bias_on		= 1,
44	.use_pmdown_time	= 1,
45	.endianness		= 1,
46};
47
48static struct snd_soc_dai_driver dit_stub_dai = {
49	.name		= "dit-hifi",
50	.playback 	= {
51		.stream_name	= "Playback",
52		.channels_min	= 1,
53		.channels_max	= 384,
54		.rates		= STUB_RATES,
55		.formats	= STUB_FORMATS,
56	},
57};
58
59static int spdif_dit_probe(struct platform_device *pdev)
60{
61	return devm_snd_soc_register_component(&pdev->dev,
62			&soc_codec_spdif_dit,
63			&dit_stub_dai, 1);
64}
65
66#ifdef CONFIG_OF
67static const struct of_device_id spdif_dit_dt_ids[] = {
68	{ .compatible = "linux,spdif-dit", },
69	{ }
70};
71MODULE_DEVICE_TABLE(of, spdif_dit_dt_ids);
72#endif
73
74static struct platform_driver spdif_dit_driver = {
75	.probe		= spdif_dit_probe,
76	.driver		= {
77		.name	= DRV_NAME,
78		.of_match_table = of_match_ptr(spdif_dit_dt_ids),
79	},
80};
81
82module_platform_driver(spdif_dit_driver);
83
84MODULE_AUTHOR("Steve Chen <schen@mvista.com>");
85MODULE_DESCRIPTION("SPDIF dummy codec driver");
86MODULE_LICENSE("GPL");
87MODULE_ALIAS("platform:" DRV_NAME);
88