ALSA: create hda_eld.c for ELD routines and proc interface

ELD handling routines can be shared by all HDMI codecs,
and they are large enough to make a standalone source file.

Signed-off-by: Wu Fengguang <wfg@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 454 insertions, 0 deletions

diff --git a/sound/pci/hda/hda_eld.c b/sound/pci/hda/hda_eld.c
new file mode 100644
index 0000000..a69a7e8
--- /dev/null
+++ b/sound/pci/hda/hda_eld.c
@@ -0,0 +1,454 @@
+/*
+ * Generic routines and proc interface for ELD(EDID Like Data) information
+ *
+ * Copyright(c) 2008 Intel Corporation.
+ *
+ * Authors:
+ * 		Wu Fengguang <wfg@linux.intel.com>
+ *
+ *  This driver is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This driver is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#include <linux/init.h>
+#include <sound/core.h>
+#include <asm/unaligned.h>
+#include "hda_codec.h"
+#include "hda_local.h"
+
+enum eld_versions {
+	ELD_VER_CEA_861D	= 2,
+	ELD_VER_PARTIAL		= 31,
+};
+
+static char *eld_versoin_names[32] = {
+	"reserved",
+	"reserved",
+	"CEA-861D or below",
+	[3 ... 30] = "reserved",
+	[31] = "partial"
+};
+
+enum cea_edid_versions {
+	CEA_EDID_VER_NONE	= 0,
+	CEA_EDID_VER_CEA861	= 1,
+	CEA_EDID_VER_CEA861A	= 2,
+	CEA_EDID_VER_CEA861BCD	= 3,
+	CEA_EDID_VER_RESERVED	= 4,
+};
+
+static char *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"
+};
+
+static char *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",
+};
+
+static char *eld_connection_type_names[4] = {
+	"HDMI",
+	"Display Port",
+	"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 char *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 (1-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 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 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 char hdmi_get_eld_byte(struct hda_codec *codec, hda_nid_t nid,
+					int byte_index)
+{
+	unsigned int val;
+
+	val = snd_hda_codec_read(codec, nid, 0,
+					AC_VERB_GET_HDMI_ELDD, byte_index);
+
+#ifdef BE_PARANOID
+	printk(KERN_INFO "ELD data byte %d: 0x%x\n", byte_index, val);
+#endif
+
+	if ((val & AC_ELDD_ELD_VALID) == 0) {
+		snd_printd(KERN_INFO "Invalid ELD data byte %d\n",
+								byte_index);
+		val = 0;
+	}
+
+	return val & AC_ELDD_ELD_DATA;
+}
+
+#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 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->format = GRAB_BITS(buf, 0, 3, 4);
+	switch (a->format) {
+	case AUDIO_CODING_TYPE_REF_STREAM_HEADER:
+		snd_printd(KERN_INFO
+				"audio coding type 0 not expected in ELD\n");
+		break;
+
+	case AUDIO_CODING_TYPE_LPCM:
+		val = GRAB_BITS(buf, 2, 0, 3);
+		a->sample_bits = 0;
+		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) {
+			snd_printd(KERN_INFO
+				"audio coding xtype %d not expected in ELD\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!
+ */
+static int hdmi_update_sink_eld(struct sink_eld *e,
+				const unsigned char *buf, int size)
+{
+	int mnl;
+	int i;
+
+	e->eld_ver = GRAB_BITS(buf, 0, 3, 5);
+	if (e->eld_ver != ELD_VER_CEA_861D &&
+	    e->eld_ver != ELD_VER_PARTIAL) {
+		snd_printd(KERN_INFO "Unknown ELD version %d\n", e->eld_ver);
+		goto out_fail;
+	}
+
+	e->eld_size = size;
+	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) {
+		snd_printd(KERN_INFO "MNL is reserved value %d\n", mnl);
+		goto out_fail;
+	} else if (ELD_FIXED_BYTES + mnl > size) {
+		snd_printd(KERN_INFO "out of range MNL %d\n", mnl);
+		goto out_fail;
+	} else
+		strlcpy(e->monitor_name, buf + ELD_FIXED_BYTES, mnl);
+
+	for (i = 0; i < e->sad_count; i++) {
+		if (ELD_FIXED_BYTES + mnl + 3 * (i + 1) > size) {
+			snd_printd(KERN_INFO "out of range SAD %d\n", i);
+			goto out_fail;
+		}
+		hdmi_update_short_audio_desc(e->sad + i,
+					buf + ELD_FIXED_BYTES + mnl + 3 * i);
+	}
+
+	return 0;
+
+out_fail:
+	e->eld_ver = 0;
+	return -EINVAL;
+}
+
+static int hdmi_present_sense(struct hda_codec *codec, hda_nid_t nid)
+{
+	return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_PIN_SENSE, 0);
+}
+
+static int hdmi_eld_valid(struct hda_codec *codec, hda_nid_t nid)
+{
+	int eldv;
+	int present;
+
+	present = hdmi_present_sense(codec, nid);
+	eldv    = (present & AC_PINSENSE_ELDV);
+	present = (present & AC_PINSENSE_PRESENCE);
+
+#ifdef CONFIG_SND_DEBUG_VERBOSE
+	printk(KERN_INFO "pinp = %d, eldv = %d\n", !!present, !!eldv);
+#endif
+
+	return eldv && present;
+}
+
+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,
+						 AC_DIPSIZE_ELD_BUF);
+}
+
+int snd_hdmi_get_eld(struct sink_eld *eld,
+		     struct hda_codec *codec, hda_nid_t nid)
+{
+	int i;
+	int ret;
+	int size;
+	unsigned char *buf;
+
+	if (!hdmi_eld_valid(codec, nid))
+		return -ENOENT;
+
+	size = snd_hdmi_get_eld_size(codec, nid);
+	if (size == 0) {
+		/* wfg: workaround for ASUS P5E-VM HDMI board */
+		snd_printd(KERN_INFO "ELD buf size is 0, force 128\n");
+		size = 128;
+	}
+	if (size < ELD_FIXED_BYTES || size > PAGE_SIZE) {
+		snd_printd(KERN_INFO "Invalid ELD buf size %d\n", size);
+		return -ERANGE;
+	}
+
+	buf = kmalloc(size, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	for (i = 0; i < size; i++)
+		buf[i] = hdmi_get_eld_byte(codec, nid, i);
+
+	ret = hdmi_update_sink_eld(eld, buf, size);
+
+	kfree(buf);
+	return ret;
+}
+
+static void hdmi_show_short_audio_desc(struct cea_sad *a)
+{
+	char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
+
+	printk(KERN_INFO "coding type: %s\n",
+					cea_audio_coding_type_names[a->format]);
+	printk(KERN_INFO "channels: %d\n", a->channels);
+
+	snd_print_pcm_rates(a->rates, buf, sizeof(buf));
+	printk(KERN_INFO "sampling frequencies: %s\n", buf);
+
+	if (a->format == AUDIO_CODING_TYPE_LPCM)
+		printk(KERN_INFO "sample bits: 0x%x\n", a->sample_bits);
+
+	if (a->max_bitrate)
+		printk(KERN_INFO "max bitrate: %d\n", a->max_bitrate);
+
+	if (a->profile)
+		printk(KERN_INFO "profile: %d\n", a->profile);
+}
+
+#define HDMI_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE 80
+static void hdmi_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 += snprintf(buf + j, buflen - j,  "%s ",
+					cea_speaker_allocation_names[i]);
+	}
+	if (j)
+		j--;	/* skip last space */
+	buf[j] = '\0';	/* necessary when j == 0 */
+}
+
+void snd_hdmi_show_eld(struct sink_eld *e)
+{
+	int i;
+	char buf[HDMI_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
+
+	printk(KERN_INFO "ELD buffer size  is %d\n", e->eld_size);
+	printk(KERN_INFO "ELD baseline len is %d*4\n", e->baseline_len);
+	printk(KERN_INFO "vendor block len is %d\n",
+					e->eld_size - e->baseline_len * 4 - 4);
+	printk(KERN_INFO "ELD version      is %s\n",
+					eld_versoin_names[e->eld_ver]);
+	printk(KERN_INFO "CEA EDID version is %s\n",
+				cea_edid_version_names[e->cea_edid_ver]);
+	printk(KERN_INFO "manufacture id   is 0x%x\n", e->manufacture_id);
+	printk(KERN_INFO "product id       is 0x%x\n", e->product_id);
+	printk(KERN_INFO "port id          is 0x%llx\n", (long long)e->port_id);
+	printk(KERN_INFO "HDCP support     is %d\n", e->support_hdcp);
+	printk(KERN_INFO "AI support       is %d\n", e->support_ai);
+	printk(KERN_INFO "SAD count        is %d\n", e->sad_count);
+	printk(KERN_INFO "audio sync delay is %x\n", e->aud_synch_delay);
+	printk(KERN_INFO "connection type  is %s\n",
+				eld_connection_type_names[e->conn_type]);
+	printk(KERN_INFO "monitor name     is %s\n", e->monitor_name);
+
+	hdmi_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
+	printk(KERN_INFO "speaker allocations: (0x%x)%s\n", e->spk_alloc, buf);
+
+	for (i = 0; i < e->sad_count; i++)
+		hdmi_show_short_audio_desc(e->sad + i);
+}