sound/soc/codecs/spdif_receiver.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * ALSA SoC SPDIF DIR (Digital Interface Reciever) driver
   4  *
   5  * Based on ALSA SoC SPDIF DIT driver
   6  *
   7  *  This driver is used by controllers which can operate in DIR (SPDI/F) where
   8  *  no codec is needed.  This file provides stub codec that can be used
   9  *  in these configurations. SPEAr SPDIF IN Audio controller uses this driver.
  10  *
  11  * Author:      Vipin Kumar,  <vipin.kumar@st.com>
  12  * Copyright:   (C) 2012  ST Microelectronics
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/moduleparam.h>
  17 #include <linux/slab.h>
  18 #include <sound/soc.h>
  19 #include <sound/pcm.h>
  20 #include <sound/initval.h>
  21 #include <linux/of.h>
  22
  23 static const struct snd_soc_dapm_widget dir_widgets[] = {
  24         SND_SOC_DAPM_INPUT("spdif-in"),
  25 };
  26
  27 static const struct snd_soc_dapm_route dir_routes[] = {
  28         { "Capture", NULL, "spdif-in" },
  29 };
  30
  31 #define STUB_RATES      SNDRV_PCM_RATE_8000_192000
  32 #define STUB_FORMATS    (SNDRV_PCM_FMTBIT_S16_LE | \
  33                         SNDRV_PCM_FMTBIT_S20_3LE | \
  34                         SNDRV_PCM_FMTBIT_S24_LE  | \
  35                         SNDRV_PCM_FMTBIT_S32_LE | \
  36                         SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
  37
  38 static struct snd_soc_component_driver soc_codec_spdif_dir = {
  39         .dapm_widgets           = dir_widgets,
  40         .num_dapm_widgets       = ARRAY_SIZE(dir_widgets),
  41         .dapm_routes            = dir_routes,
  42         .num_dapm_routes        = ARRAY_SIZE(dir_routes),
  43         .idle_bias_on           = 1,
  44         .use_pmdown_time        = 1,
  45         .endianness             = 1,
  46         .non_legacy_dai_naming  = 1,
  47 };
  48
  49 static struct snd_soc_dai_driver dir_stub_dai = {
  50         .name           = "dir-hifi",
  51         .capture        = {
  52                 .stream_name    = "Capture",
  53                 .channels_min   = 1,
  54                 .channels_max   = 384,
  55                 .rates          = STUB_RATES,
  56                 .formats        = STUB_FORMATS,
  57         },
  58 };
  59
  60 static int spdif_dir_probe(struct platform_device *pdev)
  61 {
  62         return devm_snd_soc_register_component(&pdev->dev,
  63                         &soc_codec_spdif_dir,
  64                         &dir_stub_dai, 1);
  65 }
  66
  67 #ifdef CONFIG_OF
  68 static const struct of_device_id spdif_dir_dt_ids[] = {
  69         { .compatible = "linux,spdif-dir", },
  70         { }
  71 };
  72 MODULE_DEVICE_TABLE(of, spdif_dir_dt_ids);
  73 #endif
  74
  75 static struct platform_driver spdif_dir_driver = {
  76         .probe          = spdif_dir_probe,
  77         .driver         = {
  78                 .name   = "spdif-dir",
  79                 .of_match_table = of_match_ptr(spdif_dir_dt_ids),
  80         },
  81 };
  82
  83 module_platform_driver(spdif_dir_driver);
  84
  85 MODULE_DESCRIPTION("ASoC SPDIF DIR driver");
  86 MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
  87 MODULE_LICENSE("GPL");