include/sound/hdmi-codec.h

   1 /*
   2  * hdmi-codec.h - HDMI Codec driver API
   3  *
   4  * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com
   5  *
   6  * Author: Jyri Sarha <jsarha@ti.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  */
  17
  18 #ifndef __HDMI_CODEC_H__
  19 #define __HDMI_CODEC_H__
  20
  21 #include <linux/hdmi.h>
  22 #include <drm/drm_edid.h>
  23 #include <sound/asoundef.h>
  24 #include <uapi/sound/asound.h>
  25
  26 /*
  27  * Protocol between ASoC cpu-dai and HDMI-encoder
  28  */
  29 struct hdmi_codec_daifmt {
  30         enum {
  31                 HDMI_I2S,
  32                 HDMI_RIGHT_J,
  33                 HDMI_LEFT_J,
  34                 HDMI_DSP_A,
  35                 HDMI_DSP_B,
  36                 HDMI_AC97,
  37                 HDMI_SPDIF,
  38         } fmt;
  39         unsigned int bit_clk_inv:1;
  40         unsigned int frame_clk_inv:1;
  41         unsigned int bit_clk_master:1;
  42         unsigned int frame_clk_master:1;
  43 };
  44
  45 /*
  46  * HDMI audio parameters
  47  */
  48 struct hdmi_codec_params {
  49         struct hdmi_audio_infoframe cea;
  50         struct snd_aes_iec958 iec;
  51         int sample_rate;
  52         int sample_width;
  53         int channels;
  54 };
  55
  56 struct hdmi_codec_pdata;
  57 struct hdmi_codec_ops {
  58         /*
  59          * Called when ASoC starts an audio stream setup.
  60          * Optional
  61          */
  62         int (*audio_startup)(struct device *dev, void *data);
  63
  64         /*
  65          * Configures HDMI-encoder for audio stream.
  66          * Mandatory
  67          */
  68         int (*hw_params)(struct device *dev, void *data,
  69                          struct hdmi_codec_daifmt *fmt,
  70                          struct hdmi_codec_params *hparms);
  71
  72         /*
  73          * Shuts down the audio stream.
  74          * Mandatory
  75          */
  76         void (*audio_shutdown)(struct device *dev, void *data);
  77
  78         /*
  79          * Mute/unmute HDMI audio stream.
  80          * Optional
  81          */
  82         int (*digital_mute)(struct device *dev, void *data, bool enable);
  83
  84         /*
  85          * Provides EDID-Like-Data from connected HDMI device.
  86          * Optional
  87          */
  88         int (*get_eld)(struct device *dev, void *data,
  89                        uint8_t *buf, size_t len);
  90 };
  91
  92 /* HDMI codec initalization data */
  93 struct hdmi_codec_pdata {
  94         const struct hdmi_codec_ops *ops;
  95         uint i2s:1;
  96         uint spdif:1;
  97         int max_i2s_channels;
  98         void *data;
  99 };
 100
 101 #define HDMI_CODEC_DRV_NAME "hdmi-audio-codec"
 102
 103 #endif /* __HDMI_CODEC_H__ */