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 - 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  */
  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 };
  38
  39 /*
  40  * HDMI audio parameters
  41  */
  42 struct 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
  50 struct hdmi_codec_pdata;
  51 struct hdmi_codec_ops {
  52         /*
  53          * Called when ASoC starts an audio stream setup.
  54          * Optional
  55          */
  56         int (*audio_startup)(struct device *dev, void *data);
  57
  58         /*
  59          * Configures HDMI-encoder for audio stream.
  60          * Mandatory
  61          */
  62         int (*hw_params)(struct device *dev, void *data,
  63                          struct hdmi_codec_daifmt *fmt,
  64                          struct hdmi_codec_params *hparms);
  65
  66         /*
  67          * Shuts down the audio stream.
  68          * Mandatory
  69          */
  70         void (*audio_shutdown)(struct device *dev, void *data);
  71
  72         /*
  73          * Mute/unmute HDMI audio stream.
  74          * Optional
  75          */
  76         int (*digital_mute)(struct device *dev, void *data, bool enable);
  77
  78         /*
  79          * Provides EDID-Like-Data from connected HDMI device.
  80          * Optional
  81          */
  82         int (*get_eld)(struct device *dev, void *data,
  83                        uint8_t *buf, size_t len);
  84
  85         /*
  86          * Getting DAI ID
  87          * Optional
  88          */
  89         int (*get_dai_id)(struct snd_soc_component *comment,
  90                           struct device_node *endpoint);
  91 };
  92
  93 /* HDMI codec initalization data */
  94 struct hdmi_codec_pdata {
  95         const struct hdmi_codec_ops *ops;
  96         uint i2s:1;
  97         uint spdif:1;
  98         int max_i2s_channels;
  99         void *data;
 100 };
 101
 102 #define HDMI_CODEC_DRV_NAME "hdmi-audio-codec"
 103
 104 #endif /* __HDMI_CODEC_H__ */