7acd05140a810c53065186ce6aa6dfa22235c6f7
[muen/linux.git] / sound / soc / codecs / spdif_receiver.c
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");