include/sound/hdmi-codec.h

Source file repositories/reference/linux-study-clean/include/sound/hdmi-codec.h

File Facts

System
Linux kernel
Corpus path
include/sound/hdmi-codec.h
Extension
.h
Size
3100 bytes
Lines
141
Domain
Driver Families
Bucket
include/sound
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct hdmi_codec_daifmt {
	enum {
		HDMI_I2S,
		HDMI_RIGHT_J,
		HDMI_LEFT_J,
		HDMI_DSP_A,
		HDMI_DSP_B,
		HDMI_AC97,
		HDMI_SPDIF,
	} fmt;
	unsigned int bit_clk_inv:1;
	unsigned int frame_clk_inv:1;
	unsigned int bit_clk_provider:1;
	unsigned int frame_clk_provider:1;
	/* bit_fmt could be standard PCM format or
	 * IEC958 encoded format. ALSA IEC958 plugin will pass
	 * IEC958_SUBFRAME format to the underneath driver.
	 */
	snd_pcm_format_t bit_fmt;
};

/*
 * HDMI audio parameters
 */
struct hdmi_codec_params {
	struct hdmi_audio_infoframe cea;
	struct snd_aes_iec958 iec;
	int sample_rate;
	int sample_width;
	int channels;
};

typedef void (*hdmi_codec_plugged_cb)(struct device *dev,
				      bool plugged);

struct hdmi_codec_pdata;
struct hdmi_codec_ops {
	/*
	 * Called when ASoC starts an audio stream setup.
	 * Optional
	 */
	int (*audio_startup)(struct device *dev, void *data);

	/*
	 * Configures HDMI-encoder for audio stream.
	 * Having either prepare or hw_params is mandatory.
	 */
	int (*hw_params)(struct device *dev, void *data,
			 struct hdmi_codec_daifmt *fmt,
			 struct hdmi_codec_params *hparms);

	/*
	 * Configures HDMI-encoder for audio stream. Can be called
	 * multiple times for each setup.
	 *
	 * Having either prepare or hw_params is mandatory.
	 */
	int (*prepare)(struct device *dev, void *data,
		       struct hdmi_codec_daifmt *fmt,
		       struct hdmi_codec_params *hparms);

	/*
	 * Shuts down the audio stream.
	 * Mandatory
	 */
	void (*audio_shutdown)(struct device *dev, void *data);

	/*
	 * Mute/unmute HDMI audio stream.
	 * Optional
	 */
	int (*mute_stream)(struct device *dev, void *data,
			   bool enable, int direction);

	/*
	 * Provides EDID-Like-Data from connected HDMI device.
	 * Optional
	 */
	int (*get_eld)(struct device *dev, void *data,
		       uint8_t *buf, size_t len);

	/*
	 * Getting DAI ID
	 * Optional
	 */
	int (*get_dai_id)(struct snd_soc_component *comment,
			  struct device_node *endpoint,
			  void *data);

	/*

Annotation

Implementation Notes