LXR linux/sound/soc/codecs/spdif

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * ALSA SoC SPDIF DIT driver
   4 *
   5 *  This driver is used by controllers which can operate in DIT (SPDI/F) where
   6 *  no codec is needed.  This file provides stub codec that can be used
   7 *  in these configurations. TI DaVinci Audio controller uses this driver.
   8 *
   9 * Author:      Steve Chen,  <schen@mvista.com>
  10 * Copyright:   (C) 2009 MontaVista Software, Inc., <source@mvista.com>
  11 * Copyright:   (C) 2009  Texas Instruments, India
  12 */
  13
  14#include <linux/module.h>
  15#include <linux/moduleparam.h>
  16#include <linux/slab.h>
  17#include <sound/soc.h>
  18#include <sound/pcm.h>
  19#include <sound/initval.h>
  20#include <linux/of.h>
  21
  22#define DRV_NAME "spdif-dit"
  23
  24#define STUB_RATES      SNDRV_PCM_RATE_8000_192000
  25#define STUB_FORMATS    (SNDRV_PCM_FMTBIT_S16_LE | \
  26                        SNDRV_PCM_FMTBIT_S20_3LE | \
  27                        SNDRV_PCM_FMTBIT_S24_LE  | \
  28                        SNDRV_PCM_FMTBIT_S32_LE)
  29
  30static const struct snd_soc_dapm_widget dit_widgets[] = {
  31        SND_SOC_DAPM_OUTPUT("spdif-out"),
  32};
  33
  34static const struct snd_soc_dapm_route dit_routes[] = {
  35        { "spdif-out", NULL, "Playback" },
  36};
  37
  38static struct snd_soc_component_driver soc_codec_spdif_dit = {
  39        .dapm_widgets           = dit_widgets,
  40        .num_dapm_widgets       = ARRAY_SIZE(dit_widgets),
  41        .dapm_routes            = dit_routes,
  42        .num_dapm_routes        = ARRAY_SIZE(dit_routes),
  43        .idle_bias_on           = 1,
  44        .use_pmdown_time        = 1,
  45        .endianness             = 1,
  46        .non_legacy_dai_naming  = 1,
  47};
  48
  49static 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
  60static int spdif_dit_probe(struct platform_device *pdev)
  61{
  62        return devm_snd_soc_register_component(&pdev->dev,
  63                        &soc_codec_spdif_dit,
  64                        &dit_stub_dai, 1);
  65}
  66
  67#ifdef CONFIG_OF
  68static const struct of_device_id spdif_dit_dt_ids[] = {
  69        { .compatible = "linux,spdif-dit", },
  70        { }
  71};
  72MODULE_DEVICE_TABLE(of, spdif_dit_dt_ids);
  73#endif
  74
  75static struct platform_driver spdif_dit_driver = {
  76        .probe          = spdif_dit_probe,
  77        .driver         = {
  78                .name   = DRV_NAME,
  79                .of_match_table = of_match_ptr(spdif_dit_dt_ids),
  80        },
  81};
  82
  83module_platform_driver(spdif_dit_driver);
  84
  85MODULE_AUTHOR("Steve Chen <schen@mvista.com>");
  86MODULE_DESCRIPTION("SPDIF dummy codec driver");
  87MODULE_LICENSE("GPL");
  88MODULE_ALIAS("platform:" DRV_NAME);
  89