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

6 files changed, 494 insertions, 425 deletions

diff --git a/include/sound/pcm_drm_eld.h b/include/sound/pcm_drm_eld.h
index 28a55a8beb28..5a38413ada91 100644
--- a/include/sound/pcm_drm_eld.h
+++ b/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
diff --git a/sound/core/pcm_drm_eld.c b/sound/core/pcm_drm_eld.c
index 1cdca4d4fc9c..688eefce82fa 100644
--- a/sound/core/pcm_drm_eld.c
+++ b/sound/core/pcm_drm_eld.c
@@ -5,8 +5,10 @@
 #include <linux/bitfield.h>
 #include <linux/export.h>
 #include <linux/hdmi.h>
+#include <linux/unaligned.h>
 #include <drm/drm_edid.h>
 #include <drm/drm_eld.h>
+#include <sound/info.h>
 #include <sound/pcm.h>
 #include <sound/pcm_drm_eld.h>
 
@@ -162,3 +164,388 @@ int snd_pcm_hw_constraint_eld(struct snd_pcm_runtime *runtime, void *eld)
 	return ret;
 }
 EXPORT_SYMBOL_GPL(snd_pcm_hw_constraint_eld);
+
+#define SND_PRINT_RATES_ADVISED_BUFSIZE	80
+#define SND_PRINT_BITS_ADVISED_BUFSIZE	16
+#define SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE 80
+
+static const char * const eld_connection_type_names[4] = {
+	"HDMI",
+	"DisplayPort",
+	"2-reserved",
+	"3-reserved"
+};
+
+static const char * const cea_audio_coding_type_names[] = {
+	/*  0 */ "undefined",
+	/*  1 */ "LPCM",
+	/*  2 */ "AC-3",
+	/*  3 */ "MPEG1",
+	/*  4 */ "MP3",
+	/*  5 */ "MPEG2",
+	/*  6 */ "AAC-LC",
+	/*  7 */ "DTS",
+	/*  8 */ "ATRAC",
+	/*  9 */ "DSD (One Bit Audio)",
+	/* 10 */ "E-AC-3/DD+ (Dolby Digital Plus)",
+	/* 11 */ "DTS-HD",
+	/* 12 */ "MLP (Dolby TrueHD)",
+	/* 13 */ "DST",
+	/* 14 */ "WMAPro",
+	/* 15 */ "HE-AAC",
+	/* 16 */ "HE-AACv2",
+	/* 17 */ "MPEG Surround",
+};
+
+static const char * const cea_speaker_allocation_names[] = {
+	/*  0 */ "FL/FR",
+	/*  1 */ "LFE",
+	/*  2 */ "FC",
+	/*  3 */ "RL/RR",
+	/*  4 */ "RC",
+	/*  5 */ "FLC/FRC",
+	/*  6 */ "RLC/RRC",
+	/*  7 */ "FLW/FRW",
+	/*  8 */ "FLH/FRH",
+	/*  9 */ "TC",
+	/* 10 */ "FCH",
+};
+
+/*
+ * SS1:SS0 index => sample size
+ */
+static const int cea_sample_sizes[4] = {
+	0,			/* 0: Refer to Stream Header */
+	ELD_PCM_BITS_16,	/* 1: 16 bits */
+	ELD_PCM_BITS_20,	/* 2: 20 bits */
+	ELD_PCM_BITS_24,	/* 3: 24 bits */
+};
+
+/*
+ * SF2:SF1:SF0 index => sampling frequency
+ */
+static const int cea_sampling_frequencies[8] = {
+	0,			/* 0: Refer to Stream Header */
+	SNDRV_PCM_RATE_32000,	/* 1:  32000Hz */
+	SNDRV_PCM_RATE_44100,	/* 2:  44100Hz */
+	SNDRV_PCM_RATE_48000,	/* 3:  48000Hz */
+	SNDRV_PCM_RATE_88200,	/* 4:  88200Hz */
+	SNDRV_PCM_RATE_96000,	/* 5:  96000Hz */
+	SNDRV_PCM_RATE_176400,	/* 6: 176400Hz */
+	SNDRV_PCM_RATE_192000,	/* 7: 192000Hz */
+};
+
+#define GRAB_BITS(buf, byte, lowbit, bits)		\
+({							\
+	BUILD_BUG_ON(lowbit > 7);			\
+	BUILD_BUG_ON(bits > 8);				\
+	BUILD_BUG_ON(bits <= 0);			\
+							\
+	(buf[byte] >> (lowbit)) & ((1 << (bits)) - 1);	\
+})
+
+static void hdmi_update_short_audio_desc(struct device *dev,
+					 struct snd_cea_sad *a,
+					 const unsigned char *buf)
+{
+	int i;
+	int val;
+
+	val = GRAB_BITS(buf, 1, 0, 7);
+	a->rates = 0;
+	for (i = 0; i < 7; i++)
+		if (val & (1 << i))
+			a->rates |= cea_sampling_frequencies[i + 1];
+
+	a->channels = GRAB_BITS(buf, 0, 0, 3);
+	a->channels++;
+
+	a->sample_bits = 0;
+	a->max_bitrate = 0;
+
+	a->format = GRAB_BITS(buf, 0, 3, 4);
+	switch (a->format) {
+	case AUDIO_CODING_TYPE_REF_STREAM_HEADER:
+		dev_info(dev, "HDMI: audio coding type 0 not expected\n");
+		break;
+
+	case AUDIO_CODING_TYPE_LPCM:
+		val = GRAB_BITS(buf, 2, 0, 3);
+		for (i = 0; i < 3; i++)
+			if (val & (1 << i))
+				a->sample_bits |= cea_sample_sizes[i + 1];
+		break;
+
+	case AUDIO_CODING_TYPE_AC3:
+	case AUDIO_CODING_TYPE_MPEG1:
+	case AUDIO_CODING_TYPE_MP3:
+	case AUDIO_CODING_TYPE_MPEG2:
+	case AUDIO_CODING_TYPE_AACLC:
+	case AUDIO_CODING_TYPE_DTS:
+	case AUDIO_CODING_TYPE_ATRAC:
+		a->max_bitrate = GRAB_BITS(buf, 2, 0, 8);
+		a->max_bitrate *= 8000;
+		break;
+
+	case AUDIO_CODING_TYPE_SACD:
+		break;
+
+	case AUDIO_CODING_TYPE_EAC3:
+		break;
+
+	case AUDIO_CODING_TYPE_DTS_HD:
+		break;
+
+	case AUDIO_CODING_TYPE_MLP:
+		break;
+
+	case AUDIO_CODING_TYPE_DST:
+		break;
+
+	case AUDIO_CODING_TYPE_WMAPRO:
+		a->profile = GRAB_BITS(buf, 2, 0, 3);
+		break;
+
+	case AUDIO_CODING_TYPE_REF_CXT:
+		a->format = GRAB_BITS(buf, 2, 3, 5);
+		if (a->format == AUDIO_CODING_XTYPE_HE_REF_CT ||
+		    a->format >= AUDIO_CODING_XTYPE_FIRST_RESERVED) {
+			dev_info(dev,
+				   "HDMI: audio coding xtype %d not expected\n",
+				   a->format);
+			a->format = 0;
+		} else
+			a->format += AUDIO_CODING_TYPE_HE_AAC -
+				     AUDIO_CODING_XTYPE_HE_AAC;
+		break;
+	}
+}
+
+/*
+ * Be careful, ELD buf could be totally rubbish!
+ */
+int snd_parse_eld(struct device *dev, struct snd_parsed_hdmi_eld *e,
+		  const unsigned char *buf, int size)
+{
+	int mnl;
+	int i;
+
+	memset(e, 0, sizeof(*e));
+	e->eld_ver = GRAB_BITS(buf, 0, 3, 5);
+	if (e->eld_ver != ELD_VER_CEA_861D &&
+	    e->eld_ver != ELD_VER_PARTIAL) {
+		dev_info(dev, "HDMI: Unknown ELD version %d\n", e->eld_ver);
+		goto out_fail;
+	}
+
+	e->baseline_len = GRAB_BITS(buf, 2, 0, 8);
+	mnl		= GRAB_BITS(buf, 4, 0, 5);
+	e->cea_edid_ver	= GRAB_BITS(buf, 4, 5, 3);
+
+	e->support_hdcp	= GRAB_BITS(buf, 5, 0, 1);
+	e->support_ai	= GRAB_BITS(buf, 5, 1, 1);
+	e->conn_type	= GRAB_BITS(buf, 5, 2, 2);
+	e->sad_count	= GRAB_BITS(buf, 5, 4, 4);
+
+	e->aud_synch_delay = GRAB_BITS(buf, 6, 0, 8) * 2;
+	e->spk_alloc	= GRAB_BITS(buf, 7, 0, 7);
+
+	e->port_id	  = get_unaligned_le64(buf + 8);
+
+	/* not specified, but the spec's tendency is little endian */
+	e->manufacture_id = get_unaligned_le16(buf + 16);
+	e->product_id	  = get_unaligned_le16(buf + 18);
+
+	if (mnl > ELD_MAX_MNL) {
+		dev_info(dev, "HDMI: MNL is reserved value %d\n", mnl);
+		goto out_fail;
+	} else if (ELD_FIXED_BYTES + mnl > size) {
+		dev_info(dev, "HDMI: out of range MNL %d\n", mnl);
+		goto out_fail;
+	} else
+		strscpy(e->monitor_name, buf + ELD_FIXED_BYTES, mnl + 1);
+
+	for (i = 0; i < e->sad_count; i++) {
+		if (ELD_FIXED_BYTES + mnl + 3 * (i + 1) > size) {
+			dev_info(dev, "HDMI: out of range SAD %d\n", i);
+			goto out_fail;
+		}
+		hdmi_update_short_audio_desc(dev, e->sad + i,
+					     buf + ELD_FIXED_BYTES + mnl + 3 * i);
+	}
+
+	/*
+	 * HDMI sink's ELD info cannot always be retrieved for now, e.g.
+	 * in console or for audio devices. Assume the highest speakers
+	 * configuration, to _not_ prohibit multi-channel audio playback.
+	 */
+	if (!e->spk_alloc)
+		e->spk_alloc = 0xffff;
+
+	return 0;
+
+out_fail:
+	return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(snd_parse_eld);
+
+/*
+ * 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)
+{
+	static const unsigned int alsa_rates[] = {
+		5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000, 64000,
+		88200, 96000, 176400, 192000, 384000
+	};
+	int i, j;
+
+	for (i = 0, j = 0; i < ARRAY_SIZE(alsa_rates); i++)
+		if (pcm & (1 << i))
+			j += scnprintf(buf + j, buflen - j,  " %d",
+				alsa_rates[i]);
+
+	buf[j] = '\0'; /* necessary when j == 0 */
+}
+
+static void eld_print_pcm_bits(int pcm, char *buf, int buflen)
+{
+	static const unsigned int bits[] = { 8, 16, 20, 24, 32 };
+	int i, j;
+
+	for (i = 0, j = 0; i < ARRAY_SIZE(bits); i++)
+		if (pcm & (ELD_PCM_BITS_8 << i))
+			j += scnprintf(buf + j, buflen - j,  " %d", bits[i]);
+
+	buf[j] = '\0'; /* necessary when j == 0 */
+}
+
+static void hdmi_show_short_audio_desc(struct device *dev,
+				       struct snd_cea_sad *a)
+{
+	char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
+	char buf2[8 + SND_PRINT_BITS_ADVISED_BUFSIZE] = ", bits =";
+
+	if (!a->format)
+		return;
+
+	hdmi_print_pcm_rates(a->rates, buf, sizeof(buf));
+
+	if (a->format == AUDIO_CODING_TYPE_LPCM)
+		eld_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2) - 8);
+	else if (a->max_bitrate)
+		snprintf(buf2, sizeof(buf2),
+				", max bitrate = %d", a->max_bitrate);
+	else
+		buf2[0] = '\0';
+
+	dev_dbg(dev,
+		"HDMI: supports coding type %s: channels = %d, rates =%s%s\n",
+		cea_audio_coding_type_names[a->format],
+		a->channels, buf, buf2);
+}
+
+static void snd_eld_print_channel_allocation(int spk_alloc, char *buf, int buflen)
+{
+	int i, j;
+
+	for (i = 0, j = 0; i < ARRAY_SIZE(cea_speaker_allocation_names); i++) {
+		if (spk_alloc & (1 << i))
+			j += scnprintf(buf + j, buflen - j,  " %s",
+					cea_speaker_allocation_names[i]);
+	}
+	buf[j] = '\0';	/* necessary when j == 0 */
+}
+
+void snd_show_eld(struct device *dev, struct snd_parsed_hdmi_eld *e)
+{
+	int i;
+
+	dev_dbg(dev, "HDMI: detected monitor %s at connection type %s\n",
+		e->monitor_name,
+		eld_connection_type_names[e->conn_type]);
+
+	if (e->spk_alloc) {
+		char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
+
+		snd_eld_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
+		dev_dbg(dev, "HDMI: available speakers:%s\n", buf);
+	}
+
+	for (i = 0; i < e->sad_count; i++)
+		hdmi_show_short_audio_desc(dev, e->sad + i);
+}
+EXPORT_SYMBOL_GPL(snd_show_eld);
+
+#ifdef CONFIG_SND_PROC_FS
+static void hdmi_print_sad_info(int i, struct snd_cea_sad *a,
+				struct snd_info_buffer *buffer)
+{
+	char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
+
+	snd_iprintf(buffer, "sad%d_coding_type\t[0x%x] %s\n",
+			i, a->format, cea_audio_coding_type_names[a->format]);
+	snd_iprintf(buffer, "sad%d_channels\t\t%d\n", i, a->channels);
+
+	hdmi_print_pcm_rates(a->rates, buf, sizeof(buf));
+	snd_iprintf(buffer, "sad%d_rates\t\t[0x%x]%s\n", i, a->rates, buf);
+
+	if (a->format == AUDIO_CODING_TYPE_LPCM) {
+		eld_print_pcm_bits(a->sample_bits, buf, sizeof(buf));
+		snd_iprintf(buffer, "sad%d_bits\t\t[0x%x]%s\n",
+							i, a->sample_bits, buf);
+	}
+
+	if (a->max_bitrate)
+		snd_iprintf(buffer, "sad%d_max_bitrate\t%d\n",
+							i, a->max_bitrate);
+
+	if (a->profile)
+		snd_iprintf(buffer, "sad%d_profile\t\t%d\n", i, a->profile);
+}
+
+void snd_print_eld_info(struct snd_parsed_hdmi_eld *e,
+			struct snd_info_buffer *buffer)
+{
+	char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
+	int i;
+	static const char * const eld_version_names[32] = {
+		"reserved",
+		"reserved",
+		"CEA-861D or below",
+		[3 ... 30] = "reserved",
+		[31] = "partial"
+	};
+	static const char * const cea_edid_version_names[8] = {
+		"no CEA EDID Timing Extension block present",
+		"CEA-861",
+		"CEA-861-A",
+		"CEA-861-B, C or D",
+		[4 ... 7] = "reserved"
+	};
+
+	snd_iprintf(buffer, "monitor_name\t\t%s\n", e->monitor_name);
+	snd_iprintf(buffer, "connection_type\t\t%s\n",
+				eld_connection_type_names[e->conn_type]);
+	snd_iprintf(buffer, "eld_version\t\t[0x%x] %s\n", e->eld_ver,
+					eld_version_names[e->eld_ver]);
+	snd_iprintf(buffer, "edid_version\t\t[0x%x] %s\n", e->cea_edid_ver,
+				cea_edid_version_names[e->cea_edid_ver]);
+	snd_iprintf(buffer, "manufacture_id\t\t0x%x\n", e->manufacture_id);
+	snd_iprintf(buffer, "product_id\t\t0x%x\n", e->product_id);
+	snd_iprintf(buffer, "port_id\t\t\t0x%llx\n", (long long)e->port_id);
+	snd_iprintf(buffer, "support_hdcp\t\t%d\n", e->support_hdcp);
+	snd_iprintf(buffer, "support_ai\t\t%d\n", e->support_ai);
+	snd_iprintf(buffer, "audio_sync_delay\t%d\n", e->aud_synch_delay);
+
+	snd_eld_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
+	snd_iprintf(buffer, "speakers\t\t[0x%x]%s\n", e->spk_alloc, buf);
+
+	snd_iprintf(buffer, "sad_count\t\t%d\n", e->sad_count);
+
+	for (i = 0; i < e->sad_count; i++)
+		hdmi_print_sad_info(i, e->sad + i, buffer);
+}
+EXPORT_SYMBOL_GPL(snd_print_eld_info);
+#endif /* CONFIG_SND_PROC_FS */
diff --git a/sound/pci/hda/Kconfig b/sound/pci/hda/Kconfig
index e393578cbe68..9f68cb73b54f 100644
--- a/sound/pci/hda/Kconfig
+++ b/sound/pci/hda/Kconfig
@@ -266,6 +266,7 @@ comment "Set to Y if you want auto-loading the codec driver"
 config SND_HDA_CODEC_HDMI
 	tristate "Build HDMI/DisplayPort HD-audio codec support"
 	select SND_DYNAMIC_MINORS
+	select SND_PCM_ELD
 	help
 	  Say Y or M here to include HDMI and DisplayPort HD-audio codec
 	  support in snd-hda-intel driver.  This includes all AMD/ATI,
diff --git a/sound/pci/hda/hda_eld.c b/sound/pci/hda/hda_eld.c
index 301730432375..d3e87b9c1a4f 100644
--- a/sound/pci/hda/hda_eld.c
+++ b/sound/pci/hda/hda_eld.c
@@ -17,11 +17,6 @@
 #include <sound/hda_codec.h>
 #include "hda_local.h"
 
-enum eld_versions {
-	ELD_VER_CEA_861D	= 2,
-	ELD_VER_PARTIAL		= 31,
-};
-
 enum cea_edid_versions {
 	CEA_EDID_VER_NONE	= 0,
 	CEA_EDID_VER_CEA861	= 1,
@@ -30,95 +25,12 @@ enum cea_edid_versions {
 	CEA_EDID_VER_RESERVED	= 4,
 };
 
-static const char * const eld_connection_type_names[4] = {
-	"HDMI",
-	"DisplayPort",
-	"2-reserved",
-	"3-reserved"
-};
-
-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,
-};
-
-static const char * const cea_audio_coding_type_names[] = {
-	/*  0 */ "undefined",
-	/*  1 */ "LPCM",
-	/*  2 */ "AC-3",
-	/*  3 */ "MPEG1",
-	/*  4 */ "MP3",
-	/*  5 */ "MPEG2",
-	/*  6 */ "AAC-LC",
-	/*  7 */ "DTS",
-	/*  8 */ "ATRAC",
-	/*  9 */ "DSD (One Bit Audio)",
-	/* 10 */ "E-AC-3/DD+ (Dolby Digital Plus)",
-	/* 11 */ "DTS-HD",
-	/* 12 */ "MLP (Dolby TrueHD)",
-	/* 13 */ "DST",
-	/* 14 */ "WMAPro",
-	/* 15 */ "HE-AAC",
-	/* 16 */ "HE-AACv2",
-	/* 17 */ "MPEG Surround",
-};
-
 /*
  * 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] = {
-	0,	 		/* 0: Refer to Stream Header */
-	AC_SUPPCM_BITS_16,	/* 1: 16 bits */
-	AC_SUPPCM_BITS_20,	/* 2: 20 bits */
-	AC_SUPPCM_BITS_24,	/* 3: 24 bits */
-};
-
-/*
- * SF2:SF1:SF0 index => sampling frequency
- */
-static const int cea_sampling_frequencies[8] = {
-	0,			/* 0: Refer to Stream Header */
-	SNDRV_PCM_RATE_32000,	/* 1:  32000Hz */
-	SNDRV_PCM_RATE_44100,	/* 2:  44100Hz */
-	SNDRV_PCM_RATE_48000,	/* 3:  48000Hz */
-	SNDRV_PCM_RATE_88200,	/* 4:  88200Hz */
-	SNDRV_PCM_RATE_96000,	/* 5:  96000Hz */
-	SNDRV_PCM_RATE_176400,	/* 6: 176400Hz */
-	SNDRV_PCM_RATE_192000,	/* 7: 192000Hz */
-};
-
 static unsigned int hdmi_get_eld_data(struct hda_codec *codec, hda_nid_t nid,
 					int byte_index)
 {
@@ -132,159 +44,6 @@ static unsigned int hdmi_get_eld_data(struct hda_codec *codec, hda_nid_t nid,
 	return val;
 }
 
-#define GRAB_BITS(buf, byte, lowbit, bits) 		\
-({							\
-	BUILD_BUG_ON(lowbit > 7);			\
-	BUILD_BUG_ON(bits > 8);				\
-	BUILD_BUG_ON(bits <= 0);			\
-							\
-	(buf[byte] >> (lowbit)) & ((1 << (bits)) - 1);	\
-})
-
-static void hdmi_update_short_audio_desc(struct hda_codec *codec,
-					 struct cea_sad *a,
-					 const unsigned char *buf)
-{
-	int i;
-	int val;
-
-	val = GRAB_BITS(buf, 1, 0, 7);
-	a->rates = 0;
-	for (i = 0; i < 7; i++)
-		if (val & (1 << i))
-			a->rates |= cea_sampling_frequencies[i + 1];
-
-	a->channels = GRAB_BITS(buf, 0, 0, 3);
-	a->channels++;
-
-	a->sample_bits = 0;
-	a->max_bitrate = 0;
-
-	a->format = GRAB_BITS(buf, 0, 3, 4);
-	switch (a->format) {
-	case AUDIO_CODING_TYPE_REF_STREAM_HEADER:
-		codec_info(codec, "HDMI: audio coding type 0 not expected\n");
-		break;
-
-	case AUDIO_CODING_TYPE_LPCM:
-		val = GRAB_BITS(buf, 2, 0, 3);
-		for (i = 0; i < 3; i++)
-			if (val & (1 << i))
-				a->sample_bits |= cea_sample_sizes[i + 1];
-		break;
-
-	case AUDIO_CODING_TYPE_AC3:
-	case AUDIO_CODING_TYPE_MPEG1:
-	case AUDIO_CODING_TYPE_MP3:
-	case AUDIO_CODING_TYPE_MPEG2:
-	case AUDIO_CODING_TYPE_AACLC:
-	case AUDIO_CODING_TYPE_DTS:
-	case AUDIO_CODING_TYPE_ATRAC:
-		a->max_bitrate = GRAB_BITS(buf, 2, 0, 8);
-		a->max_bitrate *= 8000;
-		break;
-
-	case AUDIO_CODING_TYPE_SACD:
-		break;
-
-	case AUDIO_CODING_TYPE_EAC3:
-		break;
-
-	case AUDIO_CODING_TYPE_DTS_HD:
-		break;
-
-	case AUDIO_CODING_TYPE_MLP:
-		break;
-
-	case AUDIO_CODING_TYPE_DST:
-		break;
-
-	case AUDIO_CODING_TYPE_WMAPRO:
-		a->profile = GRAB_BITS(buf, 2, 0, 3);
-		break;
-
-	case AUDIO_CODING_TYPE_REF_CXT:
-		a->format = GRAB_BITS(buf, 2, 3, 5);
-		if (a->format == AUDIO_CODING_XTYPE_HE_REF_CT ||
-		    a->format >= AUDIO_CODING_XTYPE_FIRST_RESERVED) {
-			codec_info(codec,
-				   "HDMI: audio coding xtype %d not expected\n",
-				   a->format);
-			a->format = 0;
-		} else
-			a->format += AUDIO_CODING_TYPE_HE_AAC -
-				     AUDIO_CODING_XTYPE_HE_AAC;
-		break;
-	}
-}
-
-/*
- * 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 mnl;
-	int i;
-
-	memset(e, 0, sizeof(*e));
-	e->eld_ver = GRAB_BITS(buf, 0, 3, 5);
-	if (e->eld_ver != ELD_VER_CEA_861D &&
-	    e->eld_ver != ELD_VER_PARTIAL) {
-		codec_info(codec, "HDMI: Unknown ELD version %d\n", e->eld_ver);
-		goto out_fail;
-	}
-
-	e->baseline_len = GRAB_BITS(buf, 2, 0, 8);
-	mnl		= GRAB_BITS(buf, 4, 0, 5);
-	e->cea_edid_ver	= GRAB_BITS(buf, 4, 5, 3);
-
-	e->support_hdcp	= GRAB_BITS(buf, 5, 0, 1);
-	e->support_ai	= GRAB_BITS(buf, 5, 1, 1);
-	e->conn_type	= GRAB_BITS(buf, 5, 2, 2);
-	e->sad_count	= GRAB_BITS(buf, 5, 4, 4);
-
-	e->aud_synch_delay = GRAB_BITS(buf, 6, 0, 8) * 2;
-	e->spk_alloc	= GRAB_BITS(buf, 7, 0, 7);
-
-	e->port_id	  = get_unaligned_le64(buf + 8);
-
-	/* not specified, but the spec's tendency is little endian */
-	e->manufacture_id = get_unaligned_le16(buf + 16);
-	e->product_id	  = get_unaligned_le16(buf + 18);
-
-	if (mnl > ELD_MAX_MNL) {
-		codec_info(codec, "HDMI: MNL is reserved value %d\n", mnl);
-		goto out_fail;
-	} else if (ELD_FIXED_BYTES + mnl > size) {
-		codec_info(codec, "HDMI: out of range MNL %d\n", mnl);
-		goto out_fail;
-	} else
-		strscpy(e->monitor_name, buf + ELD_FIXED_BYTES, mnl + 1);
-
-	for (i = 0; i < e->sad_count; i++) {
-		if (ELD_FIXED_BYTES + mnl + 3 * (i + 1) > size) {
-			codec_info(codec, "HDMI: out of range SAD %d\n", i);
-			goto out_fail;
-		}
-		hdmi_update_short_audio_desc(codec, e->sad + i,
-					buf + ELD_FIXED_BYTES + mnl + 3 * i);
-	}
-
-	/*
-	 * HDMI sink's ELD info cannot always be retrieved for now, e.g.
-	 * in console or for audio devices. Assume the highest speakers
-	 * configuration, to _not_ prohibit multi-channel audio playback.
-	 */
-	if (!e->spk_alloc)
-		e->spk_alloc = 0xffff;
-
-	return 0;
-
-out_fail:
-	return -EINVAL;
-}
-
 int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid)
 {
 	return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_SIZE,
@@ -346,155 +105,27 @@ error:
 	return ret;
 }
 
-/*
- * 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)
-{
-	static const unsigned int alsa_rates[] = {
-		5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000, 64000,
-		88200, 96000, 176400, 192000, 384000
-	};
-	int i, j;
-
-	for (i = 0, j = 0; i < ARRAY_SIZE(alsa_rates); i++)
-		if (pcm & (1 << i))
-			j += scnprintf(buf + j, buflen - j,  " %d",
-				alsa_rates[i]);
-
-	buf[j] = '\0'; /* necessary when j == 0 */
-}
-
-#define SND_PRINT_RATES_ADVISED_BUFSIZE	80
-
-static void hdmi_show_short_audio_desc(struct hda_codec *codec,
-				       struct cea_sad *a)
-{
-	char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
-	char buf2[8 + SND_PRINT_BITS_ADVISED_BUFSIZE] = ", bits =";
-
-	if (!a->format)
-		return;
-
-	hdmi_print_pcm_rates(a->rates, buf, sizeof(buf));
-
-	if (a->format == AUDIO_CODING_TYPE_LPCM)
-		snd_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2) - 8);
-	else if (a->max_bitrate)
-		snprintf(buf2, sizeof(buf2),
-				", max bitrate = %d", a->max_bitrate);
-	else
-		buf2[0] = '\0';
-
-	codec_dbg(codec,
-		  "HDMI: supports coding type %s: channels = %d, rates =%s%s\n",
-		  cea_audio_coding_type_names[a->format],
-		  a->channels, buf, buf2);
-}
-
-void snd_hdmi_show_eld(struct hda_codec *codec, struct parsed_hdmi_eld *e)
-{
-	int i;
-
-	codec_dbg(codec, "HDMI: detected monitor %s at connection type %s\n",
-			e->monitor_name,
-			eld_connection_type_names[e->conn_type]);
-
-	if (e->spk_alloc) {
-		char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
-		snd_hdac_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
-		codec_dbg(codec, "HDMI: available speakers:%s\n", buf);
-	}
-
-	for (i = 0; i < e->sad_count; i++)
-		hdmi_show_short_audio_desc(codec, e->sad + i);
-}
-
 #ifdef CONFIG_SND_PROC_FS
-
-static void hdmi_print_sad_info(int i, struct cea_sad *a,
-				struct snd_info_buffer *buffer)
-{
-	char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
-
-	snd_iprintf(buffer, "sad%d_coding_type\t[0x%x] %s\n",
-			i, a->format, cea_audio_coding_type_names[a->format]);
-	snd_iprintf(buffer, "sad%d_channels\t\t%d\n", i, a->channels);
-
-	hdmi_print_pcm_rates(a->rates, buf, sizeof(buf));
-	snd_iprintf(buffer, "sad%d_rates\t\t[0x%x]%s\n", i, a->rates, buf);
-
-	if (a->format == AUDIO_CODING_TYPE_LPCM) {
-		snd_print_pcm_bits(a->sample_bits, buf, sizeof(buf));
-		snd_iprintf(buffer, "sad%d_bits\t\t[0x%x]%s\n",
-							i, a->sample_bits, buf);
-	}
-
-	if (a->max_bitrate)
-		snd_iprintf(buffer, "sad%d_max_bitrate\t%d\n",
-							i, a->max_bitrate);
-
-	if (a->profile)
-		snd_iprintf(buffer, "sad%d_profile\t\t%d\n", i, a->profile);
-}
-
 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)
 {
-	struct parsed_hdmi_eld *e = &eld->info;
-	char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
-	int i;
-	static const char * const eld_version_names[32] = {
-		"reserved",
-		"reserved",
-		"CEA-861D or below",
-		[3 ... 30] = "reserved",
-		[31] = "partial"
-	};
-	static const char * const cea_edid_version_names[8] = {
-		"no CEA EDID Timing Extension block present",
-		"CEA-861",
-		"CEA-861-A",
-		"CEA-861-B, C or D",
-		[4 ... 7] = "reserved"
-	};
-
 	snd_iprintf(buffer, "monitor_present\t\t%d\n", eld->monitor_present);
 	snd_iprintf(buffer, "eld_valid\t\t%d\n", eld->eld_valid);
 	snd_iprintf(buffer, "codec_pin_nid\t\t0x%x\n", pin_nid);
 	snd_iprintf(buffer, "codec_dev_id\t\t0x%x\n", dev_id);
 	snd_iprintf(buffer, "codec_cvt_nid\t\t0x%x\n", cvt_nid);
+
 	if (!eld->eld_valid)
 		return;
-	snd_iprintf(buffer, "monitor_name\t\t%s\n", e->monitor_name);
-	snd_iprintf(buffer, "connection_type\t\t%s\n",
-				eld_connection_type_names[e->conn_type]);
-	snd_iprintf(buffer, "eld_version\t\t[0x%x] %s\n", e->eld_ver,
-					eld_version_names[e->eld_ver]);
-	snd_iprintf(buffer, "edid_version\t\t[0x%x] %s\n", e->cea_edid_ver,
-				cea_edid_version_names[e->cea_edid_ver]);
-	snd_iprintf(buffer, "manufacture_id\t\t0x%x\n", e->manufacture_id);
-	snd_iprintf(buffer, "product_id\t\t0x%x\n", e->product_id);
-	snd_iprintf(buffer, "port_id\t\t\t0x%llx\n", (long long)e->port_id);
-	snd_iprintf(buffer, "support_hdcp\t\t%d\n", e->support_hdcp);
-	snd_iprintf(buffer, "support_ai\t\t%d\n", e->support_ai);
-	snd_iprintf(buffer, "audio_sync_delay\t%d\n", e->aud_synch_delay);
-
-	snd_hdac_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
-	snd_iprintf(buffer, "speakers\t\t[0x%x]%s\n", e->spk_alloc, buf);
-
-	snd_iprintf(buffer, "sad_count\t\t%d\n", e->sad_count);
-
-	for (i = 0; i < e->sad_count; i++)
-		hdmi_print_sad_info(i, e->sad + i, buffer);
+
+	snd_print_eld_info(&eld->info, buffer);
 }
 
 void snd_hdmi_write_eld_info(struct hdmi_eld *eld,
 			     struct snd_info_buffer *buffer)
 {
-	struct parsed_hdmi_eld *e = &eld->info;
+	struct snd_parsed_hdmi_eld *e = &eld->info;
 	char line[64];
 	char name[64];
 	char *sname;
@@ -556,7 +187,7 @@ void snd_hdmi_write_eld_info(struct hdmi_eld *eld,
 #endif /* CONFIG_SND_PROC_FS */
 
 /* update PCM info based on ELD */
-void snd_hdmi_eld_update_pcm_info(struct parsed_hdmi_eld *e,
+void snd_hdmi_eld_update_pcm_info(struct snd_parsed_hdmi_eld *e,
 			      struct hda_pcm_stream *hinfo)
 {
 	u32 rates;
@@ -574,17 +205,17 @@ void snd_hdmi_eld_update_pcm_info(struct parsed_hdmi_eld *e,
 	maxbps = 16;
 	channels_max = 2;
 	for (i = 0; i < e->sad_count; i++) {
-		struct cea_sad *a = &e->sad[i];
+		struct snd_cea_sad *a = &e->sad[i];
 		rates |= a->rates;
 		if (a->channels > channels_max)
 			channels_max = a->channels;
 		if (a->format == AUDIO_CODING_TYPE_LPCM) {
-			if (a->sample_bits & AC_SUPPCM_BITS_20) {
+			if (a->sample_bits & ELD_PCM_BITS_20) {
 				formats |= SNDRV_PCM_FMTBIT_S32_LE;
 				if (maxbps < 20)
 					maxbps = 20;
 			}
-			if (a->sample_bits & AC_SUPPCM_BITS_24) {
+			if (a->sample_bits & ELD_PCM_BITS_24) {
 				formats |= SNDRV_PCM_FMTBIT_S32_LE;
 				if (maxbps < 24)
 					maxbps = 24;
diff --git a/sound/pci/hda/hda_local.h b/sound/pci/hda/hda_local.h
index 763f79f6f32e..4714057dba85 100644
--- a/sound/pci/hda/hda_local.h
+++ b/sound/pci/hda/hda_local.h
@@ -10,6 +10,8 @@
 #ifndef __SOUND_HDA_LOCAL_H
 #define __SOUND_HDA_LOCAL_H
 
+#include <sound/pcm_drm_eld.h>
+
 /* We abuse kcontrol_new.subdev field to pass the NID corresponding to
  * the given new control.  If id.subdev has a bit flag HDA_SUBDEV_NID_FLAG,
  * snd_hda_ctl_add() takes the lower-bit subdev value as a valid NID.
@@ -675,61 +677,18 @@ int snd_hda_enum_helper_info(struct snd_kcontrol *kcontrol,
 #define snd_hda_enum_bool_helper_info(kcontrol, uinfo) \
 	snd_hda_enum_helper_info(kcontrol, uinfo, 0, NULL)
 
-/*
- * CEA Short Audio Descriptor data
- */
-struct 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
-
-/*
- * ELD: EDID Like Data
- */
-struct 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 cea_sad sad[ELD_MAX_SAD];
-};
-
 struct hdmi_eld {
 	bool	monitor_present;
 	bool	eld_valid;
 	int	eld_size;
 	char    eld_buffer[ELD_MAX_SIZE];
-	struct parsed_hdmi_eld info;
+	struct snd_parsed_hdmi_eld info;
 };
 
 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);
-int snd_hdmi_parse_eld(struct hda_codec *codec, struct parsed_hdmi_eld *e,
-		       const unsigned char *buf, int size);
-void snd_hdmi_show_eld(struct hda_codec *codec, struct parsed_hdmi_eld *e);
-void snd_hdmi_eld_update_pcm_info(struct parsed_hdmi_eld *e,
+void snd_hdmi_eld_update_pcm_info(struct snd_parsed_hdmi_eld *e,
 			      struct hda_pcm_stream *hinfo);
 
 int snd_hdmi_get_eld_ati(struct hda_codec *codec, hda_nid_t nid,
diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index 643e0496b093..7167989a8d86 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -1511,8 +1511,8 @@ static void update_eld(struct hda_codec *codec,
 
 	if (eld->eld_valid) {
 		if (eld->eld_size <= 0 ||
-		    snd_hdmi_parse_eld(codec, &eld->info, eld->eld_buffer,
-				       eld->eld_size) < 0) {
+		    snd_parse_eld(hda_codec_dev(codec), &eld->info,
+				  eld->eld_buffer, eld->eld_size) < 0) {
 			eld->eld_valid = false;
 			if (repoll) {
 				schedule_delayed_work(&per_pin->work,
@@ -1555,7 +1555,7 @@ static void update_eld(struct hda_codec *codec,
 		pcm_jack = pin_idx_to_pcm_jack(codec, per_pin);
 
 	if (eld->eld_valid)
-		snd_hdmi_show_eld(codec, &eld->info);
+		snd_show_eld(hda_codec_dev(codec), &eld->info);
 
 	eld_changed = (pin_eld->eld_valid != eld->eld_valid);
 	eld_changed |= (pin_eld->monitor_present != eld->monitor_present);