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 #define STUB_RATES	SNDRV_PCM_RATE_8000_192000
27 #define STUB_FORMATS	(SNDRV_PCM_FMTBIT_S16_LE | \
28 			SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
29 
30 static struct snd_soc_codec_driver soc_codec_spdif_dir;
31 
32 static struct snd_soc_dai_driver dir_stub_dai = {
33 	.name		= "dir-hifi",
34 	.capture	= {
35 		.stream_name	= "Capture",
36 		.channels_min	= 1,
37 		.channels_max	= 384,
38 		.rates		= STUB_RATES,
39 		.formats	= STUB_FORMATS,
40 	},
41 };
42 
43 static int spdif_dir_probe(struct platform_device *pdev)
44 {
45 	return snd_soc_register_codec(&pdev->dev, &soc_codec_spdif_dir,
46 			&dir_stub_dai, 1);
47 }
48 
49 static int spdif_dir_remove(struct platform_device *pdev)
50 {
51 	snd_soc_unregister_codec(&pdev->dev);
52 	return 0;
53 }
54 
55 #ifdef CONFIG_OF
56 static const struct of_device_id spdif_dir_dt_ids[] = {
57 	{ .compatible = "linux,spdif-dir", },
58 	{ }
59 };
60 MODULE_DEVICE_TABLE(of, spdif_dir_dt_ids);
61 #endif
62 
63 static struct platform_driver spdif_dir_driver = {
64 	.probe		= spdif_dir_probe,
65 	.remove		= spdif_dir_remove,
66 	.driver		= {
67 		.name	= "spdif-dir",
68 		.owner	= THIS_MODULE,
69 		.of_match_table = of_match_ptr(spdif_dir_dt_ids),
70 	},
71 };
72 
73 module_platform_driver(spdif_dir_driver);
74 
75 MODULE_DESCRIPTION("ASoC SPDIF DIR driver");
76 MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
77 MODULE_LICENSE("GPL");
78