LXR linux/sound/soc/codecs/spdif

   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
  32static const struct snd_soc_dapm_widget dit_widgets[] = {
  33        SND_SOC_DAPM_OUTPUT("spdif-out"),
  34};
  35
  36static const struct snd_soc_dapm_route dit_routes[] = {
  37        { "spdif-out", NULL, "Playback" },
  38};
  39
  40static struct snd_soc_codec_driver soc_codec_spdif_dit = {
  41        .dapm_widgets = dit_widgets,
  42        .num_dapm_widgets = ARRAY_SIZE(dit_widgets),
  43        .dapm_routes = dit_routes,
  44        .num_dapm_routes = ARRAY_SIZE(dit_routes),
  45};
  46
  47static struct snd_soc_dai_driver dit_stub_dai = {
  48        .name           = "dit-hifi",
  49        .playback       = {
  50                .stream_name    = "Playback",
  51                .channels_min   = 1,
  52                .channels_max   = 384,
  53                .rates          = STUB_RATES,
  54                .formats        = STUB_FORMATS,
  55        },
  56};
  57
  58static int spdif_dit_probe(struct platform_device *pdev)
  59{
  60        return snd_soc_register_codec(&pdev->dev, &soc_codec_spdif_dit,
  61                        &dit_stub_dai, 1);
  62}
  63
  64static int spdif_dit_remove(struct platform_device *pdev)
  65{
  66        snd_soc_unregister_codec(&pdev->dev);
  67        return 0;
  68}
  69
  70#ifdef CONFIG_OF
  71static const struct of_device_id spdif_dit_dt_ids[] = {
  72        { .compatible = "linux,spdif-dit", },
  73        { }
  74};
  75MODULE_DEVICE_TABLE(of, spdif_dit_dt_ids);
  76#endif
  77
  78static struct platform_driver spdif_dit_driver = {
  79        .probe          = spdif_dit_probe,
  80        .remove         = spdif_dit_remove,
  81        .driver         = {
  82                .name   = DRV_NAME,
  83                .of_match_table = of_match_ptr(spdif_dit_dt_ids),
  84        },
  85};
  86
  87module_platform_driver(spdif_dit_driver);
  88
  89MODULE_AUTHOR("Steve Chen <schen@mvista.com>");
  90MODULE_DESCRIPTION("SPDIF dummy codec driver");
  91MODULE_LICENSE("GPL");
  92MODULE_ALIAS("platform:" DRV_NAME);
  93