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Linux/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_192000
 28 #define STUB_FORMATS    (SNDRV_PCM_FMTBIT_S16_LE | \
 29                         SNDRV_PCM_FMTBIT_S20_3LE | \
 30                         SNDRV_PCM_FMTBIT_S24_LE)
 31 
 32 static const struct snd_soc_dapm_widget dit_widgets[] = {
 33         SND_SOC_DAPM_OUTPUT("spdif-out"),
 34 };
 35 
 36 static const struct snd_soc_dapm_route dit_routes[] = {
 37         { "spdif-out", NULL, "Playback" },
 38 };
 39 
 40 static struct snd_soc_codec_driver soc_codec_spdif_dit = {
 41         .component_driver = {
 42                 .dapm_widgets           = dit_widgets,
 43                 .num_dapm_widgets       = ARRAY_SIZE(dit_widgets),
 44                 .dapm_routes            = dit_routes,
 45                 .num_dapm_routes        = ARRAY_SIZE(dit_routes),
 46         },
 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 snd_soc_register_codec(&pdev->dev, &soc_codec_spdif_dit,
 63                         &dit_stub_dai, 1);
 64 }
 65 
 66 static int spdif_dit_remove(struct platform_device *pdev)
 67 {
 68         snd_soc_unregister_codec(&pdev->dev);
 69         return 0;
 70 }
 71 
 72 #ifdef CONFIG_OF
 73 static const struct of_device_id spdif_dit_dt_ids[] = {
 74         { .compatible = "linux,spdif-dit", },
 75         { }
 76 };
 77 MODULE_DEVICE_TABLE(of, spdif_dit_dt_ids);
 78 #endif
 79 
 80 static struct platform_driver spdif_dit_driver = {
 81         .probe          = spdif_dit_probe,
 82         .remove         = spdif_dit_remove,
 83         .driver         = {
 84                 .name   = DRV_NAME,
 85                 .of_match_table = of_match_ptr(spdif_dit_dt_ids),
 86         },
 87 };
 88 
 89 module_platform_driver(spdif_dit_driver);
 90 
 91 MODULE_AUTHOR("Steve Chen <schen@mvista.com>");
 92 MODULE_DESCRIPTION("SPDIF dummy codec driver");
 93 MODULE_LICENSE("GPL");
 94 MODULE_ALIAS("platform:" DRV_NAME);
 95 

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