ALSA: hda/hdmi: extract common interface for ELD handling

Other HDMI-related cards (e.g. hdmi-codec) are also using the ELD.
Exrtact common set of interfaces for handling the ELD.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20250124-alsa-hdmi-codec-eld-v1-1-bad045cfaeac@linaro.org

include/sound/pcm_drm_eld.h

@@ -2,6 +2,97 @@
 #ifndef __SOUND_PCM_DRM_ELD_H
 #define __SOUND_PCM_DRM_ELD_H
 
+enum eld_versions {
+	ELD_VER_CEA_861D	= 2,
+	ELD_VER_PARTIAL		= 31,
+};
+
+enum cea_audio_coding_types {
+	AUDIO_CODING_TYPE_REF_STREAM_HEADER	=  0,
+	AUDIO_CODING_TYPE_LPCM			=  1,
+	AUDIO_CODING_TYPE_AC3			=  2,
+	AUDIO_CODING_TYPE_MPEG1			=  3,
+	AUDIO_CODING_TYPE_MP3			=  4,
+	AUDIO_CODING_TYPE_MPEG2			=  5,
+	AUDIO_CODING_TYPE_AACLC			=  6,
+	AUDIO_CODING_TYPE_DTS			=  7,
+	AUDIO_CODING_TYPE_ATRAC			=  8,
+	AUDIO_CODING_TYPE_SACD			=  9,
+	AUDIO_CODING_TYPE_EAC3			= 10,
+	AUDIO_CODING_TYPE_DTS_HD		= 11,
+	AUDIO_CODING_TYPE_MLP			= 12,
+	AUDIO_CODING_TYPE_DST			= 13,
+	AUDIO_CODING_TYPE_WMAPRO		= 14,
+	AUDIO_CODING_TYPE_REF_CXT		= 15,
+	/* also include valid xtypes below */
+	AUDIO_CODING_TYPE_HE_AAC		= 15,
+	AUDIO_CODING_TYPE_HE_AAC2		= 16,
+	AUDIO_CODING_TYPE_MPEG_SURROUND		= 17,
+};
+
+enum cea_audio_coding_xtypes {
+	AUDIO_CODING_XTYPE_HE_REF_CT		= 0,
+	AUDIO_CODING_XTYPE_HE_AAC		= 1,
+	AUDIO_CODING_XTYPE_HE_AAC2		= 2,
+	AUDIO_CODING_XTYPE_MPEG_SURROUND	= 3,
+	AUDIO_CODING_XTYPE_FIRST_RESERVED	= 4,
+};
+
+/*
+ * CEA Short Audio Descriptor data
+ */
+struct snd_cea_sad {
+	int	channels;
+	int	format;		/* (format == 0) indicates invalid SAD */
+	int	rates;
+	int	sample_bits;	/* for LPCM */
+	int	max_bitrate;	/* for AC3...ATRAC */
+	int	profile;	/* for WMAPRO */
+};
+
+#define ELD_FIXED_BYTES	20
+#define ELD_MAX_SIZE    256
+#define ELD_MAX_MNL	16
+#define ELD_MAX_SAD	16
+
+#define ELD_PCM_BITS_8		BIT(0)
+#define ELD_PCM_BITS_16		BIT(1)
+#define ELD_PCM_BITS_20		BIT(2)
+#define ELD_PCM_BITS_24		BIT(3)
+#define ELD_PCM_BITS_32		BIT(4)
+
+/*
+ * ELD: EDID Like Data
+ */
+struct snd_parsed_hdmi_eld {
+	/*
+	 * all fields will be cleared before updating ELD
+	 */
+	int	baseline_len;
+	int	eld_ver;
+	int	cea_edid_ver;
+	char	monitor_name[ELD_MAX_MNL + 1];
+	int	manufacture_id;
+	int	product_id;
+	u64	port_id;
+	int	support_hdcp;
+	int	support_ai;
+	int	conn_type;
+	int	aud_synch_delay;
+	int	spk_alloc;
+	int	sad_count;
+	struct snd_cea_sad sad[ELD_MAX_SAD];
+};
+
 int snd_pcm_hw_constraint_eld(struct snd_pcm_runtime *runtime, void *eld);
 
+int snd_parse_eld(struct device *dev, struct snd_parsed_hdmi_eld *e,
+		  const unsigned char *buf, int size);
+void snd_show_eld(struct device *dev, struct snd_parsed_hdmi_eld *e);
+
+#ifdef CONFIG_SND_PROC_FS
+void snd_print_eld_info(struct snd_parsed_hdmi_eld *eld,
+			struct snd_info_buffer *buffer);
+#endif
+
 #endif