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spdif_receiver.c
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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, <[email protected]>
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 
25 #define STUB_RATES SNDRV_PCM_RATE_8000_192000
26 #define STUB_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
27  SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
28 
29 static struct snd_soc_codec_driver soc_codec_spdif_dir;
30 
31 static struct snd_soc_dai_driver dir_stub_dai = {
32  .name = "dir-hifi",
33  .capture = {
34  .stream_name = "Capture",
35  .channels_min = 1,
36  .channels_max = 384,
37  .rates = STUB_RATES,
38  .formats = STUB_FORMATS,
39  },
40 };
41 
42 static int spdif_dir_probe(struct platform_device *pdev)
43 {
44  return snd_soc_register_codec(&pdev->dev, &soc_codec_spdif_dir,
45  &dir_stub_dai, 1);
46 }
47 
48 static int spdif_dir_remove(struct platform_device *pdev)
49 {
51  return 0;
52 }
53 
54 static struct platform_driver spdif_dir_driver = {
55  .probe = spdif_dir_probe,
56  .remove = spdif_dir_remove,
57  .driver = {
58  .name = "spdif-dir",
59  .owner = THIS_MODULE,
60  },
61 };
62 
63 module_platform_driver(spdif_dir_driver);
64 
65 MODULE_DESCRIPTION("ASoC SPDIF DIR driver");
66 MODULE_AUTHOR("Vipin Kumar <[email protected]>");
67 MODULE_LICENSE("GPL");