063a64ff82d3ed9c764f917b22f22ff291d3c3d1
[muen/linux.git] / sound / soc / codecs / spdif_transmitter.c
1 /*
2  * ALSA SoC SPDIF DIT driver
3  *
4  *  This driver is used by controllers which can operate in DIT (SPDI/F) where
5  *  no codec is needed.  This file provides stub codec that can be used
6  *  in these configurations. TI DaVinci Audio controller uses this driver.
7  *
8  * Author:      Steve Chen,  <schen@mvista.com>
9  * Copyright:   (C) 2009 MontaVista Software, Inc., <source@mvista.com>
10  * Copyright:   (C) 2009  Texas Instruments, India
11  *
12  * This program is free software; you can redistribute it and/or modify
13  * it under the terms of the GNU General Public License version 2 as
14  * published by the Free Software Foundation.
15  */
16
17 #include <linux/module.h>
18 #include <linux/moduleparam.h>
19 #include <linux/slab.h>
20 #include <sound/soc.h>
21 #include <sound/pcm.h>
22 #include <sound/initval.h>
23 #include <linux/of.h>
24
25 #define DRV_NAME "spdif-dit"
26
27 #define STUB_RATES      SNDRV_PCM_RATE_8000_192000
28 #define STUB_FORMATS    (SNDRV_PCM_FMTBIT_S16_LE | \
29                         SNDRV_PCM_FMTBIT_S20_3LE | \
30                         SNDRV_PCM_FMTBIT_S24_LE)
31
32 static const struct snd_soc_dapm_widget dit_widgets[] = {
33         SND_SOC_DAPM_OUTPUT("spdif-out"),
34 };
35
36 static const struct snd_soc_dapm_route dit_routes[] = {
37         { "spdif-out", NULL, "Playback" },
38 };
39
40 static const struct snd_soc_codec_driver soc_codec_spdif_dit = {
41         .component_driver = {
42                 .dapm_widgets           = dit_widgets,
43                 .num_dapm_widgets       = ARRAY_SIZE(dit_widgets),
44                 .dapm_routes            = dit_routes,
45                 .num_dapm_routes        = ARRAY_SIZE(dit_routes),
46         },
47 };
48
49 static struct snd_soc_dai_driver dit_stub_dai = {
50         .name           = "dit-hifi",
51         .playback       = {
52                 .stream_name    = "Playback",
53                 .channels_min   = 1,
54                 .channels_max   = 384,
55                 .rates          = STUB_RATES,
56                 .formats        = STUB_FORMATS,
57         },
58 };
59
60 static int spdif_dit_probe(struct platform_device *pdev)
61 {
62         return snd_soc_register_codec(&pdev->dev, &soc_codec_spdif_dit,
63                         &dit_stub_dai, 1);
64 }
65
66 static int spdif_dit_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_dit_dt_ids[] = {
74         { .compatible = "linux,spdif-dit", },
75         { }
76 };
77 MODULE_DEVICE_TABLE(of, spdif_dit_dt_ids);
78 #endif
79
80 static struct platform_driver spdif_dit_driver = {
81         .probe          = spdif_dit_probe,
82         .remove         = spdif_dit_remove,
83         .driver         = {
84                 .name   = DRV_NAME,
85                 .of_match_table = of_match_ptr(spdif_dit_dt_ids),
86         },
87 };
88
89 module_platform_driver(spdif_dit_driver);
90
91 MODULE_AUTHOR("Steve Chen <schen@mvista.com>");
92 MODULE_DESCRIPTION("SPDIF dummy codec driver");
93 MODULE_LICENSE("GPL");
94 MODULE_ALIAS("platform:" DRV_NAME);