linux/include/sound/hdmi-codec.h
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   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * hdmi-codec.h - HDMI Codec driver API
   4 *
   5 * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com
   6 *
   7 * Author: Jyri Sarha <jsarha@ti.com>
   8 */
   9
  10#ifndef __HDMI_CODEC_H__
  11#define __HDMI_CODEC_H__
  12
  13#include <linux/of_graph.h>
  14#include <linux/hdmi.h>
  15#include <drm/drm_edid.h>
  16#include <sound/asoundef.h>
  17#include <sound/soc.h>
  18#include <uapi/sound/asound.h>
  19
  20/*
  21 * Protocol between ASoC cpu-dai and HDMI-encoder
  22 */
  23struct hdmi_codec_daifmt {
  24        enum {
  25                HDMI_I2S,
  26                HDMI_RIGHT_J,
  27                HDMI_LEFT_J,
  28                HDMI_DSP_A,
  29                HDMI_DSP_B,
  30                HDMI_AC97,
  31                HDMI_SPDIF,
  32        } fmt;
  33        unsigned int bit_clk_inv:1;
  34        unsigned int frame_clk_inv:1;
  35        unsigned int bit_clk_master:1;
  36        unsigned int frame_clk_master:1;
  37};
  38
  39/*
  40 * HDMI audio parameters
  41 */
  42struct hdmi_codec_params {
  43        struct hdmi_audio_infoframe cea;
  44        struct snd_aes_iec958 iec;
  45        int sample_rate;
  46        int sample_width;
  47        int channels;
  48};
  49
  50typedef void (*hdmi_codec_plugged_cb)(struct device *dev,
  51                                      bool plugged);
  52
  53struct hdmi_codec_pdata;
  54struct hdmi_codec_ops {
  55        /*
  56         * Called when ASoC starts an audio stream setup.
  57         * Optional
  58         */
  59        int (*audio_startup)(struct device *dev, void *data);
  60
  61        /*
  62         * Configures HDMI-encoder for audio stream.
  63         * Mandatory
  64         */
  65        int (*hw_params)(struct device *dev, void *data,
  66                         struct hdmi_codec_daifmt *fmt,
  67                         struct hdmi_codec_params *hparms);
  68
  69        /*
  70         * Shuts down the audio stream.
  71         * Mandatory
  72         */
  73        void (*audio_shutdown)(struct device *dev, void *data);
  74
  75        /*
  76         * Mute/unmute HDMI audio stream.
  77         * Optional
  78         */
  79        int (*digital_mute)(struct device *dev, void *data, bool enable);
  80
  81        /*
  82         * Provides EDID-Like-Data from connected HDMI device.
  83         * Optional
  84         */
  85        int (*get_eld)(struct device *dev, void *data,
  86                       uint8_t *buf, size_t len);
  87
  88        /*
  89         * Getting DAI ID
  90         * Optional
  91         */
  92        int (*get_dai_id)(struct snd_soc_component *comment,
  93                          struct device_node *endpoint);
  94
  95        /*
  96         * Hook callback function to handle connector plug event.
  97         * Optional
  98         */
  99        int (*hook_plugged_cb)(struct device *dev, void *data,
 100                               hdmi_codec_plugged_cb fn,
 101                               struct device *codec_dev);
 102};
 103
 104/* HDMI codec initalization data */
 105struct hdmi_codec_pdata {
 106        const struct hdmi_codec_ops *ops;
 107        uint i2s:1;
 108        uint spdif:1;
 109        int max_i2s_channels;
 110        void *data;
 111};
 112
 113struct snd_soc_component;
 114struct snd_soc_jack;
 115
 116int hdmi_codec_set_jack_detect(struct snd_soc_component *component,
 117                               struct snd_soc_jack *jack);
 118
 119#define HDMI_CODEC_DRV_NAME "hdmi-audio-codec"
 120
 121#endif /* __HDMI_CODEC_H__ */
 122