/*
* 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);
}
