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 - https://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        /* bit_fmt could be standard PCM format or
  38         * IEC958 encoded format. ALSA IEC958 plugin will pass
  39         * IEC958_SUBFRAME format to the underneath driver.
  40         */
  41        snd_pcm_format_t bit_fmt;
  42};
  43
  44/*
  45 * HDMI audio parameters
  46 */
  47struct hdmi_codec_params {
  48        struct hdmi_audio_infoframe cea;
  49        struct snd_aes_iec958 iec;
  50        int sample_rate;
  51        int sample_width;
  52        int channels;
  53};
  54
  55typedef void (*hdmi_codec_plugged_cb)(struct device *dev,
  56                                      bool plugged);
  57
  58struct hdmi_codec_pdata;
  59struct hdmi_codec_ops {
  60        /*
  61         * Called when ASoC starts an audio stream setup.
  62         * Optional
  63         */
  64        int (*audio_startup)(struct device *dev, void *data);
  65
  66        /*
  67         * Configures HDMI-encoder for audio stream.
  68         * Having either prepare or hw_params is mandatory.
  69         */
  70        int (*hw_params)(struct device *dev, void *data,
  71                         struct hdmi_codec_daifmt *fmt,
  72                         struct hdmi_codec_params *hparms);
  73
  74        /*
  75         * Configures HDMI-encoder for audio stream. Can be called
  76         * multiple times for each setup.
  77         *
  78         * Having either prepare or hw_params is mandatory.
  79         */
  80        int (*prepare)(struct device *dev, void *data,
  81                       struct hdmi_codec_daifmt *fmt,
  82                       struct hdmi_codec_params *hparms);
  83
  84        /*
  85         * Shuts down the audio stream.
  86         * Mandatory
  87         */
  88        void (*audio_shutdown)(struct device *dev, void *data);
  89
  90        /*
  91         * Mute/unmute HDMI audio stream.
  92         * Optional
  93         */
  94        int (*mute_stream)(struct device *dev, void *data,
  95                           bool enable, int direction);
  96
  97        /*
  98         * Provides EDID-Like-Data from connected HDMI device.
  99         * Optional
 100         */
 101        int (*get_eld)(struct device *dev, void *data,
 102                       uint8_t *buf, size_t len);
 103
 104        /*
 105         * Getting DAI ID
 106         * Optional
 107         */
 108        int (*get_dai_id)(struct snd_soc_component *comment,
 109                          struct device_node *endpoint);
 110
 111        /*
 112         * Hook callback function to handle connector plug event.
 113         * Optional
 114         */
 115        int (*hook_plugged_cb)(struct device *dev, void *data,
 116                               hdmi_codec_plugged_cb fn,
 117                               struct device *codec_dev);
 118
 119        /* bit field */
 120        unsigned int no_capture_mute:1;
 121};
 122
 123/* HDMI codec initalization data */
 124struct hdmi_codec_pdata {
 125        const struct hdmi_codec_ops *ops;
 126        uint i2s:1;
 127        uint spdif:1;
 128        int max_i2s_channels;
 129        void *data;
 130};
 131
 132struct snd_soc_component;
 133struct snd_soc_jack;
 134
 135#define HDMI_CODEC_DRV_NAME "hdmi-audio-codec"
 136
 137#endif /* __HDMI_CODEC_H__ */
 138