sound/soc/codecs/spdif_transciever.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
  24 #define DRV_NAME "spdif-dit"
  25
  26 #define STUB_RATES      SNDRV_PCM_RATE_8000_96000
  27 #define STUB_FORMATS    SNDRV_PCM_FMTBIT_S16_LE
  28
  29
  30 static struct snd_soc_codec_driver soc_codec_spdif_dit;
  31
  32 static struct snd_soc_dai_driver dit_stub_dai = {
  33         .name           = "dit-hifi",
  34         .playback       = {
  35                 .stream_name    = "Playback",
  36                 .channels_min   = 1,
  37                 .channels_max   = 384,
  38                 .rates          = STUB_RATES,
  39                 .formats        = STUB_FORMATS,
  40         },
  41 };
  42
  43 static int spdif_dit_probe(struct platform_device *pdev)
  44 {
  45         return snd_soc_register_codec(&pdev->dev, &soc_codec_spdif_dit,
  46                         &dit_stub_dai, 1);
  47 }
  48
  49 static int spdif_dit_remove(struct platform_device *pdev)
  50 {
  51         snd_soc_unregister_codec(&pdev->dev);
  52         return 0;
  53 }
  54
  55 static struct platform_driver spdif_dit_driver = {
  56         .probe          = spdif_dit_probe,
  57         .remove         = spdif_dit_remove,
  58         .driver         = {
  59                 .name   = DRV_NAME,
  60                 .owner  = THIS_MODULE,
  61         },
  62 };
  63
  64 static int __init dit_modinit(void)
  65 {
  66         return platform_driver_register(&spdif_dit_driver);
  67 }
  68
  69 static void __exit dit_exit(void)
  70 {
  71         platform_driver_unregister(&spdif_dit_driver);
  72 }
  73
  74 module_init(dit_modinit);
  75 module_exit(dit_exit);
  76
  77 MODULE_AUTHOR("Steve Chen <schen@mvista.com>");
  78 MODULE_DESCRIPTION("SPDIF dummy codec driver");
  79 MODULE_LICENSE("GPL");
  80 MODULE_ALIAS("platform:" DRV_NAME);