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 
26 static const struct snd_soc_dapm_widget dir_widgets[] = {
27 	SND_SOC_DAPM_INPUT("spdif-in"),
28 };
29 
30 static 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 
40 static const struct snd_soc_codec_driver soc_codec_spdif_dir = {
41 	.component_driver = {
42 		.dapm_widgets		= dir_widgets,
43 		.num_dapm_widgets	= ARRAY_SIZE(dir_widgets),
44 		.dapm_routes		= dir_routes,
45 		.num_dapm_routes	= ARRAY_SIZE(dir_routes),
46 	},
47 };
48 
49 static 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 
60 static int spdif_dir_probe(struct platform_device *pdev)
61 {
62 	return snd_soc_register_codec(&pdev->dev, &soc_codec_spdif_dir,
63 			&dir_stub_dai, 1);
64 }
65 
66 static int spdif_dir_remove(struct platform_device *pdev)
67 {
68 	snd_soc_unregister_codec(&pdev->dev);
69 	return 0;
70 }
71 
72 #ifdef CONFIG_OF
73 static const struct of_device_id spdif_dir_dt_ids[] = {
74 	{ .compatible = "linux,spdif-dir", },
75 	{ }
76 };
77 MODULE_DEVICE_TABLE(of, spdif_dir_dt_ids);
78 #endif
79 
80 static struct platform_driver spdif_dir_driver = {
81 	.probe		= spdif_dir_probe,
82 	.remove		= spdif_dir_remove,
83 	.driver		= {
84 		.name	= "spdif-dir",
85 		.of_match_table = of_match_ptr(spdif_dir_dt_ids),
86 	},
87 };
88 
89 module_platform_driver(spdif_dir_driver);
90 
91 MODULE_DESCRIPTION("ASoC SPDIF DIR driver");
92 MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
93 MODULE_LICENSE("GPL");
94