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Linux/sound/soc/codecs/spdif_transmitter.c

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  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 
 30 static const struct snd_soc_dapm_widget dit_widgets[] = {
 31         SND_SOC_DAPM_OUTPUT("spdif-out"),
 32 };
 33 
 34 static const struct snd_soc_dapm_route dit_routes[] = {
 35         { "spdif-out", NULL, "Playback" },
 36 };
 37 
 38 static 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 
 49 static 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 
 60 static 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
 68 static const struct of_device_id spdif_dit_dt_ids[] = {
 69         { .compatible = "linux,spdif-dit", },
 70         { }
 71 };
 72 MODULE_DEVICE_TABLE(of, spdif_dit_dt_ids);
 73 #endif
 74 
 75 static 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 
 83 module_platform_driver(spdif_dit_driver);
 84 
 85 MODULE_AUTHOR("Steve Chen <schen@mvista.com>");
 86 MODULE_DESCRIPTION("SPDIF dummy codec driver");
 87 MODULE_LICENSE("GPL");
 88 MODULE_ALIAS("platform:" DRV_NAME);
 89 

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