1/*
2 * ALSA SoC SPDIF DIT driver
3 *
4 *  This driver is used by controllers which can operate in DIT (SPDI/F) where
5 *  no codec is needed.  This file provides stub codec that can be used
6 *  in these configurations. TI DaVinci Audio controller uses this driver.
7 *
8 * Author:      Steve Chen,  <schen@mvista.com>
9 * Copyright:   (C) 2009 MontaVista Software, Inc., <source@mvista.com>
10 * Copyright:   (C) 2009  Texas Instruments, India
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 */
16
17#include <linux/module.h>
18#include <linux/moduleparam.h>
19#include <linux/slab.h>
20#include <sound/soc.h>
21#include <sound/pcm.h>
22#include <sound/initval.h>
23#include <linux/of.h>
24
25#define DRV_NAME "spdif-dit"
26
27#define STUB_RATES	SNDRV_PCM_RATE_8000_192000
28#define STUB_FORMATS	(SNDRV_PCM_FMTBIT_S16_LE | \
29			SNDRV_PCM_FMTBIT_S20_3LE | \
30			SNDRV_PCM_FMTBIT_S24_LE)
31
32static const struct snd_soc_dapm_widget dit_widgets[] = {
33	SND_SOC_DAPM_OUTPUT("spdif-out"),
34};
35
36static const struct snd_soc_dapm_route dit_routes[] = {
37	{ "spdif-out", NULL, "Playback" },
38};
39
40static struct snd_soc_codec_driver soc_codec_spdif_dit = {
41	.dapm_widgets = dit_widgets,
42	.num_dapm_widgets = ARRAY_SIZE(dit_widgets),
43	.dapm_routes = dit_routes,
44	.num_dapm_routes = ARRAY_SIZE(dit_routes),
45};
46
47static struct snd_soc_dai_driver dit_stub_dai = {
48	.name		= "dit-hifi",
49	.playback 	= {
50		.stream_name	= "Playback",
51		.channels_min	= 1,
52		.channels_max	= 384,
53		.rates		= STUB_RATES,
54		.formats	= STUB_FORMATS,
55	},
56};
57
58static int spdif_dit_probe(struct platform_device *pdev)
59{
60	return snd_soc_register_codec(&pdev->dev, &soc_codec_spdif_dit,
61			&dit_stub_dai, 1);
62}
63
64static int spdif_dit_remove(struct platform_device *pdev)
65{
66	snd_soc_unregister_codec(&pdev->dev);
67	return 0;
68}
69
70#ifdef CONFIG_OF
71static const struct of_device_id spdif_dit_dt_ids[] = {
72	{ .compatible = "linux,spdif-dit", },
73	{ }
74};
75MODULE_DEVICE_TABLE(of, spdif_dit_dt_ids);
76#endif
77
78static struct platform_driver spdif_dit_driver = {
79	.probe		= spdif_dit_probe,
80	.remove		= spdif_dit_remove,
81	.driver		= {
82		.name	= DRV_NAME,
83		.of_match_table = of_match_ptr(spdif_dit_dt_ids),
84	},
85};
86
87module_platform_driver(spdif_dit_driver);
88
89MODULE_AUTHOR("Steve Chen <schen@mvista.com>");
90MODULE_DESCRIPTION("SPDIF dummy codec driver");
91MODULE_LICENSE("GPL");
92MODULE_ALIAS("platform:" DRV_NAME);
93