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_96000
  28 #define STUB_FORMATS    SNDRV_PCM_FMTBIT_S16_LE
  29
  30
  31 static struct snd_soc_codec_driver soc_codec_spdif_dit;
  32
  33 static struct snd_soc_dai_driver dit_stub_dai = {
  34         .name           = "dit-hifi",
  35         .playback       = {
  36                 .stream_name    = "Playback",
  37                 .channels_min   = 1,
  38                 .channels_max   = 384,
  39                 .rates          = STUB_RATES,
  40                 .formats        = STUB_FORMATS,
  41         },
  42 };
  43
  44 static int spdif_dit_probe(struct platform_device *pdev)
  45 {
  46         return snd_soc_register_codec(&pdev->dev, &soc_codec_spdif_dit,
  47                         &dit_stub_dai, 1);
  48 }
  49
  50 static int spdif_dit_remove(struct platform_device *pdev)
  51 {
  52         snd_soc_unregister_codec(&pdev->dev);
  53         return 0;
  54 }
  55
  56 #ifdef CONFIG_OF
  57 static const struct of_device_id spdif_dit_dt_ids[] = {
  58         { .compatible = "linux,spdif-dit", },
  59         { }
  60 };
  61 MODULE_DEVICE_TABLE(of, spdif_dit_dt_ids);
  62 #endif
  63
  64 static struct platform_driver spdif_dit_driver = {
  65         .probe          = spdif_dit_probe,
  66         .remove         = spdif_dit_remove,
  67         .driver         = {
  68                 .name   = DRV_NAME,
  69                 .owner  = THIS_MODULE,
  70                 .of_match_table = of_match_ptr(spdif_dit_dt_ids),
  71         },
  72 };
  73
  74 module_platform_driver(spdif_dit_driver);
  75
  76 MODULE_AUTHOR("Steve Chen <schen@mvista.com>");
  77 MODULE_DESCRIPTION("SPDIF dummy codec driver");
  78 MODULE_LICENSE("GPL");
  79 MODULE_ALIAS("platform:" DRV_NAME);