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         int bit_clk_inv:1;
  40         int frame_clk_inv:1;
  41         int bit_clk_master:1;
  42         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_ops {
  57         /*
  58          * Called when ASoC starts an audio stream setup.
  59          * Optional
  60          */
  61         int (*audio_startup)(struct device *dev);
  62
  63         /*
  64          * Configures HDMI-encoder for audio stream.
  65          * Mandatory
  66          */
  67         int (*hw_params)(struct device *dev,
  68                          struct hdmi_codec_daifmt *fmt,
  69                          struct hdmi_codec_params *hparms);
  70
  71         /*
  72          * Shuts down the audio stream.
  73          * Mandatory
  74          */
  75         void (*audio_shutdown)(struct device *dev);
  76
  77         /*
  78          * Mute/unmute HDMI audio stream.
  79          * Optional
  80          */
  81         int (*digital_mute)(struct device *dev, bool enable);
  82
  83         /*
  84          * Provides EDID-Like-Data from connected HDMI device.
  85          * Optional
  86          */
  87         int (*get_eld)(struct device *dev, uint8_t *buf, size_t len);
  88 };
  89
  90 /* HDMI codec initalization data */
  91 struct hdmi_codec_pdata {
  92         const struct hdmi_codec_ops *ops;
  93         uint i2s:1;
  94         uint spdif:1;
  95         int max_i2s_channels;
  96 };
  97
  98 #define HDMI_CODEC_DRV_NAME "hdmi-audio-codec"
  99
 100 #endif /* __HDMI_CODEC_H__ */