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_768000 | \
25			 SNDRV_PCM_RATE_128000)
26#define STUB_FORMATS	(SNDRV_PCM_FMTBIT_S16_LE | \
27			SNDRV_PCM_FMTBIT_S20_3LE | \
28			SNDRV_PCM_FMTBIT_S24_LE  | \
29			SNDRV_PCM_FMTBIT_S32_LE)
30
31static const struct snd_soc_dapm_widget dit_widgets[] = {
32	SND_SOC_DAPM_OUTPUT("spdif-out"),
33};
34
35static const struct snd_soc_dapm_route dit_routes[] = {
36	{ "spdif-out", NULL, "Playback" },
37};
38
39static const struct snd_soc_component_driver soc_codec_spdif_dit = {
40	.dapm_widgets		= dit_widgets,
41	.num_dapm_widgets	= ARRAY_SIZE(dit_widgets),
42	.dapm_routes		= dit_routes,
43	.num_dapm_routes	= ARRAY_SIZE(dit_routes),
44	.idle_bias_on		= 1,
45	.use_pmdown_time	= 1,
46	.endianness		= 1,
47};
48
49static struct snd_soc_dai_driver dit_stub_dai = {
50	.name		= "dit-hifi",
51	.playback 	= {
52		.stream_name	= "Playback",
53		.channels_min	= 1,
54		.channels_max	= 384,
55		.rates		= STUB_RATES,
56		.formats	= STUB_FORMATS,
57	},
58};
59
60static int spdif_dit_probe(struct platform_device *pdev)
61{
62	return devm_snd_soc_register_component(&pdev->dev,
63			&soc_codec_spdif_dit,
64			&dit_stub_dai, 1);
65}
66
67#ifdef CONFIG_OF
68static const struct of_device_id spdif_dit_dt_ids[] = {
69	{ .compatible = "linux,spdif-dit", },
70	{ }
71};
72MODULE_DEVICE_TABLE(of, spdif_dit_dt_ids);
73#endif
74
75static struct platform_driver spdif_dit_driver = {
76	.probe		= spdif_dit_probe,
77	.driver		= {
78		.name	= DRV_NAME,
79		.of_match_table = of_match_ptr(spdif_dit_dt_ids),
80	},
81};
82
83module_platform_driver(spdif_dit_driver);
84
85MODULE_AUTHOR("Steve Chen <schen@mvista.com>");
86MODULE_DESCRIPTION("SPDIF dummy codec driver");
87MODULE_LICENSE("GPL");
88MODULE_ALIAS("platform:" DRV_NAME);