1/*
2 * ALSA SoC SPDIF DIR (Digital Interface Reciever) driver
3 *
4 * Based on ALSA SoC SPDIF DIT driver
5 *
6 *  This driver is used by controllers which can operate in DIR (SPDI/F) where
7 *  no codec is needed.  This file provides stub codec that can be used
8 *  in these configurations. SPEAr SPDIF IN Audio controller uses this driver.
9 *
10 * Author:      Vipin Kumar,  <vipin.kumar@st.com>
11 * Copyright:   (C) 2012  ST Microelectronics
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 */
17
18#include <linux/module.h>
19#include <linux/moduleparam.h>
20#include <linux/slab.h>
21#include <sound/soc.h>
22#include <sound/pcm.h>
23#include <sound/initval.h>
24#include <linux/of.h>
25
26static const struct snd_soc_dapm_widget dir_widgets[] = {
27	SND_SOC_DAPM_INPUT("spdif-in"),
28};
29
30static const struct snd_soc_dapm_route dir_routes[] = {
31	{ "Capture", NULL, "spdif-in" },
32};
33
34#define STUB_RATES	SNDRV_PCM_RATE_8000_192000
35#define STUB_FORMATS	(SNDRV_PCM_FMTBIT_S16_LE | \
36			SNDRV_PCM_FMTBIT_S20_3LE | \
37			SNDRV_PCM_FMTBIT_S24_LE | \
38			SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
39
40static struct snd_soc_codec_driver soc_codec_spdif_dir = {
41	.dapm_widgets = dir_widgets,
42	.num_dapm_widgets = ARRAY_SIZE(dir_widgets),
43	.dapm_routes = dir_routes,
44	.num_dapm_routes = ARRAY_SIZE(dir_routes),
45};
46
47static struct snd_soc_dai_driver dir_stub_dai = {
48	.name		= "dir-hifi",
49	.capture	= {
50		.stream_name	= "Capture",
51		.channels_min	= 1,
52		.channels_max	= 384,
53		.rates		= STUB_RATES,
54		.formats	= STUB_FORMATS,
55	},
56};
57
58static int spdif_dir_probe(struct platform_device *pdev)
59{
60	return snd_soc_register_codec(&pdev->dev, &soc_codec_spdif_dir,
61			&dir_stub_dai, 1);
62}
63
64static int spdif_dir_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_dir_dt_ids[] = {
72	{ .compatible = "linux,spdif-dir", },
73	{ }
74};
75MODULE_DEVICE_TABLE(of, spdif_dir_dt_ids);
76#endif
77
78static struct platform_driver spdif_dir_driver = {
79	.probe		= spdif_dir_probe,
80	.remove		= spdif_dir_remove,
81	.driver		= {
82		.name	= "spdif-dir",
83		.of_match_table = of_match_ptr(spdif_dir_dt_ids),
84	},
85};
86
87module_platform_driver(spdif_dir_driver);
88
89MODULE_DESCRIPTION("ASoC SPDIF DIR driver");
90MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
91MODULE_LICENSE("GPL");
92