1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * ALSA SoC SPDIF DIR (Digital Interface Reciever) driver
 4 *
 5 * Based on ALSA SoC SPDIF DIT driver
 6 *
 7 *  This driver is used by controllers which can operate in DIR (SPDI/F) where
 8 *  no codec is needed.  This file provides stub codec that can be used
 9 *  in these configurations. SPEAr SPDIF IN Audio controller uses this driver.
10 *
11 * Author:      Vipin Kumar,  <vipin.kumar@st.com>
12 * Copyright:   (C) 2012  ST Microelectronics
13 */
14
15#include <linux/module.h>
16#include <linux/moduleparam.h>
17#include <linux/slab.h>
18#include <sound/soc.h>
19#include <sound/pcm.h>
20#include <sound/initval.h>
21#include <linux/of.h>
22
23static const struct snd_soc_dapm_widget dir_widgets[] = {
24	SND_SOC_DAPM_INPUT("spdif-in"),
25};
26
27static const struct snd_soc_dapm_route dir_routes[] = {
28	{ "Capture", NULL, "spdif-in" },
29};
30
31#define STUB_RATES	(SNDRV_PCM_RATE_8000_768000 | \
32			 SNDRV_PCM_RATE_128000)
33#define STUB_FORMATS	(SNDRV_PCM_FMTBIT_S16_LE | \
34			SNDRV_PCM_FMTBIT_S20_3LE | \
35			SNDRV_PCM_FMTBIT_S24_LE  | \
36			SNDRV_PCM_FMTBIT_S32_LE | \
37			SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
38
39static const struct snd_soc_component_driver soc_codec_spdif_dir = {
40	.dapm_widgets		= dir_widgets,
41	.num_dapm_widgets	= ARRAY_SIZE(dir_widgets),
42	.dapm_routes		= dir_routes,
43	.num_dapm_routes	= ARRAY_SIZE(dir_routes),
44	.idle_bias_on		= 1,
45	.use_pmdown_time	= 1,
46	.endianness		= 1,
47};
48
49static struct snd_soc_dai_driver dir_stub_dai = {
50	.name		= "dir-hifi",
51	.capture	= {
52		.stream_name	= "Capture",
53		.channels_min	= 1,
54		.channels_max	= 384,
55		.rates		= STUB_RATES,
56		.formats	= STUB_FORMATS,
57	},
58};
59
60static int spdif_dir_probe(struct platform_device *pdev)
61{
62	return devm_snd_soc_register_component(&pdev->dev,
63			&soc_codec_spdif_dir,
64			&dir_stub_dai, 1);
65}
66
67#ifdef CONFIG_OF
68static const struct of_device_id spdif_dir_dt_ids[] = {
69	{ .compatible = "linux,spdif-dir", },
70	{ }
71};
72MODULE_DEVICE_TABLE(of, spdif_dir_dt_ids);
73#endif
74
75static struct platform_driver spdif_dir_driver = {
76	.probe		= spdif_dir_probe,
77	.driver		= {
78		.name	= "spdif-dir",
79		.of_match_table = of_match_ptr(spdif_dir_dt_ids),
80	},
81};
82
83module_platform_driver(spdif_dir_driver);
84
85MODULE_DESCRIPTION("ASoC SPDIF DIR driver");
86MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
87MODULE_LICENSE("GPL");