include/sound/hdmi-codec.h

   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  */
  23 struct 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  */
  47 struct 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
  55 typedef void (*hdmi_codec_plugged_cb)(struct device *dev,
  56                                       bool plugged);
  57
  58 struct hdmi_codec_pdata;
  59 struct 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          * 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          * Shuts down the audio stream.
  76          * Mandatory
  77          */
  78         void (*audio_shutdown)(struct device *dev, void *data);
  79
  80         /*
  81          * Mute/unmute HDMI audio stream.
  82          * Optional
  83          */
  84         int (*mute_stream)(struct device *dev, void *data,
  85                            bool enable, int direction);
  86
  87         /*
  88          * Provides EDID-Like-Data from connected HDMI device.
  89          * Optional
  90          */
  91         int (*get_eld)(struct device *dev, void *data,
  92                        uint8_t *buf, size_t len);
  93
  94         /*
  95          * Getting DAI ID
  96          * Optional
  97          */
  98         int (*get_dai_id)(struct snd_soc_component *comment,
  99                           struct device_node *endpoint);
 100
 101         /*
 102          * Hook callback function to handle connector plug event.
 103          * Optional
 104          */
 105         int (*hook_plugged_cb)(struct device *dev, void *data,
 106                                hdmi_codec_plugged_cb fn,
 107                                struct device *codec_dev);
 108
 109         /* bit field */
 110         unsigned int no_capture_mute:1;
 111 };
 112
 113 /* HDMI codec initalization data */
 114 struct hdmi_codec_pdata {
 115         const struct hdmi_codec_ops *ops;
 116         uint i2s:1;
 117         uint spdif:1;
 118         int max_i2s_channels;
 119         void *data;
 120 };
 121
 122 struct snd_soc_component;
 123 struct snd_soc_jack;
 124
 125 #define HDMI_CODEC_DRV_NAME "hdmi-audio-codec"
 126
 127 #endif /* __HDMI_CODEC_H__ */