linux/sound/pci/hda/hda_eld.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Generic routines and proc interface for ELD(EDID Like Data) information
 *
 * Copyright(c) 2008 Intel Corporation.
 * Copyright (c) 2013 Anssi Hannula <[email protected]>
 *
 * Authors:
 * 		Wu Fengguang <[email protected]>
 */

#include <linux/init.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <asm/unaligned.h>
#include <sound/hda_chmap.h>
#include <sound/hda_codec.h>
#include "hda_local.h"

enum eld_versions { … };

enum cea_edid_versions { … };

static const char * const eld_connection_type_names[4] = …;

enum cea_audio_coding_types { … };

enum cea_audio_coding_xtypes { … };

static const char * const cea_audio_coding_type_names[] = …;

/*
 * The following two lists are shared between
 * 	- HDMI audio InfoFrame (source to sink)
 * 	- CEA E-EDID Extension (sink to source)
 */

/*
 * SS1:SS0 index => sample size
 */
static const int cea_sample_sizes[4] = …;

/*
 * SF2:SF1:SF0 index => sampling frequency
 */
static const int cea_sampling_frequencies[8] = …;

static unsigned int hdmi_get_eld_data(struct hda_codec *codec, hda_nid_t nid,
					int byte_index)
{ … }

#define GRAB_BITS(buf, byte, lowbit, bits) …

static void hdmi_update_short_audio_desc(struct hda_codec *codec,
					 struct cea_sad *a,
					 const unsigned char *buf)
{ … }

/*
 * Be careful, ELD buf could be totally rubbish!
 */
int snd_hdmi_parse_eld(struct hda_codec *codec, struct parsed_hdmi_eld *e,
			  const unsigned char *buf, int size)
{ … }

int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid)
{ … }

int snd_hdmi_get_eld(struct hda_codec *codec, hda_nid_t nid,
		     unsigned char *buf, int *eld_size)
{ … }

/*
 * SNDRV_PCM_RATE_* and AC_PAR_PCM values don't match, print correct rates with
 * hdmi-specific routine.
 */
static void hdmi_print_pcm_rates(int pcm, char *buf, int buflen)
{ … }

#define SND_PRINT_RATES_ADVISED_BUFSIZE …

static void hdmi_show_short_audio_desc(struct hda_codec *codec,
				       struct cea_sad *a)
{ … }

void snd_hdmi_show_eld(struct hda_codec *codec, struct parsed_hdmi_eld *e)
{ … }

#ifdef CONFIG_SND_PROC_FS

static void hdmi_print_sad_info(int i, struct cea_sad *a,
				struct snd_info_buffer *buffer)
{ … }

void snd_hdmi_print_eld_info(struct hdmi_eld *eld,
			     struct snd_info_buffer *buffer,
			     hda_nid_t pin_nid, int dev_id, hda_nid_t cvt_nid)
{ … }

void snd_hdmi_write_eld_info(struct hdmi_eld *eld,
			     struct snd_info_buffer *buffer)
{ … }
#endif /* CONFIG_SND_PROC_FS */

/* update PCM info based on ELD */
void snd_hdmi_eld_update_pcm_info(struct parsed_hdmi_eld *e,
			      struct hda_pcm_stream *hinfo)
{ … }


/* ATI/AMD specific stuff (ELD emulation) */

#define ATI_VERB_SET_AUDIO_DESCRIPTOR …
#define ATI_VERB_SET_SINK_INFO_INDEX …
#define ATI_VERB_GET_SPEAKER_ALLOCATION …
#define ATI_VERB_GET_AUDIO_DESCRIPTOR …
#define ATI_VERB_GET_AUDIO_VIDEO_DELAY …
#define ATI_VERB_GET_SINK_INFO_INDEX …
#define ATI_VERB_GET_SINK_INFO_DATA …

#define ATI_SPKALLOC_SPKALLOC …
#define ATI_SPKALLOC_TYPE_HDMI …
#define ATI_SPKALLOC_TYPE_DISPLAYPORT …

/* first three bytes are just standard SAD */
#define ATI_AUDIODESC_CHANNELS …
#define ATI_AUDIODESC_RATES …
#define ATI_AUDIODESC_LPCM_STEREO_RATES …

/* in standard HDMI VSDB format */
#define ATI_DELAY_VIDEO_LATENCY …
#define ATI_DELAY_AUDIO_LATENCY …

enum ati_sink_info_idx { … };

int snd_hdmi_get_eld_ati(struct hda_codec *codec, hda_nid_t nid,
			 unsigned char *buf, int *eld_size, bool rev3_or_later)
{ … }