kernel/sound/soc/codecs/hdmi.c

   1 /*
   2  * ALSA SoC codec driver for HDMI audio codecs.
   3  * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
   4  * Author: Ricardo Neri <ricardo.neri@ti.com>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * version 2 as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  18  * 02110-1301 USA
  19  *
  20  */
  21 #include <linux/module.h>
  22 #include <sound/soc.h>
  23 #include <linux/of.h>
  24 #include <linux/of_device.h>
  25
  26 #define DRV_NAME "hdmi-audio-codec"
  27
  28 static const struct snd_soc_dapm_widget hdmi_widgets[] = {
  29         SND_SOC_DAPM_INPUT("RX"),
  30         SND_SOC_DAPM_OUTPUT("TX"),
  31 };
  32
  33 static const struct snd_soc_dapm_route hdmi_routes[] = {
  34         { "Capture", NULL, "RX" },
  35         { "TX", NULL, "Playback" },
  36 };
  37
  38 static struct snd_soc_dai_driver hdmi_codec_dai = {
  39         .name = "hdmi-hifi",
  40         .playback = {
  41                 .stream_name = "Playback",
  42                 .channels_min = 2,
  43                 .channels_max = 8,
  44                 .rates = SNDRV_PCM_RATE_32000 |
  45                         SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
  46                         SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
  47                         SNDRV_PCM_RATE_176400 | SNDRV_PCM_RATE_192000,
  48                 .formats = SNDRV_PCM_FMTBIT_S16_LE |
  49                         SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE,
  50                 .sig_bits = 24,
  51         },
  52         .capture = {
  53                 .stream_name = "Capture",
  54                 .channels_min = 2,
  55                 .channels_max = 2,
  56                 .rates = SNDRV_PCM_RATE_32000 |
  57                         SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
  58                         SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
  59                         SNDRV_PCM_RATE_176400 | SNDRV_PCM_RATE_192000,
  60                 .formats = SNDRV_PCM_FMTBIT_S16_LE |
  61                         SNDRV_PCM_FMTBIT_S24_LE,
  62         },
  63
  64 };
  65
  66 #ifdef CONFIG_OF
  67 static const struct of_device_id hdmi_audio_codec_ids[] = {
  68         { .compatible = "linux,hdmi-audio", },
  69         { }
  70 };
  71 MODULE_DEVICE_TABLE(of, hdmi_audio_codec_ids);
  72 #endif
  73
  74 static struct snd_soc_codec_driver hdmi_codec = {
  75         .dapm_widgets = hdmi_widgets,
  76         .num_dapm_widgets = ARRAY_SIZE(hdmi_widgets),
  77         .dapm_routes = hdmi_routes,
  78         .num_dapm_routes = ARRAY_SIZE(hdmi_routes),
  79         .ignore_pmdown_time = true,
  80 };
  81
  82 static int hdmi_codec_probe(struct platform_device *pdev)
  83 {
  84         return snd_soc_register_codec(&pdev->dev, &hdmi_codec,
  85                         &hdmi_codec_dai, 1);
  86 }
  87
  88 static int hdmi_codec_remove(struct platform_device *pdev)
  89 {
  90         snd_soc_unregister_codec(&pdev->dev);
  91         return 0;
  92 }
  93
  94 static struct platform_driver hdmi_codec_driver = {
  95         .driver         = {
  96                 .name   = DRV_NAME,
  97                 .of_match_table = of_match_ptr(hdmi_audio_codec_ids),
  98         },
  99
 100         .probe          = hdmi_codec_probe,
 101         .remove         = hdmi_codec_remove,
 102 };
 103
 104 module_platform_driver(hdmi_codec_driver);
 105
 106 MODULE_AUTHOR("Ricardo Neri <ricardo.neri@ti.com>");
 107 MODULE_DESCRIPTION("ASoC generic HDMI codec driver");
 108 MODULE_LICENSE("GPL");
 109 MODULE_ALIAS("platform:" DRV_NAME);