sound/pci/hda/hda_eld.c

   1 /*
   2  * Generic routines and proc interface for ELD(EDID Like Data) information
   3  *
   4  * Copyright(c) 2008 Intel Corporation.
   5  *
   6  * Authors:
   7  *              Wu Fengguang <wfg@linux.intel.com>
   8  *
   9  *  This driver is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This driver is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  22  */
  23
  24 #include <linux/init.h>
  25 #include <linux/slab.h>
  26 #include <sound/core.h>
  27 #include <asm/unaligned.h>
  28 #include "hda_codec.h"
  29 #include "hda_local.h"
  30
  31 enum eld_versions {
  32         ELD_VER_CEA_861D        = 2,
  33         ELD_VER_PARTIAL         = 31,
  34 };
  35
  36 enum cea_edid_versions {
  37         CEA_EDID_VER_NONE       = 0,
  38         CEA_EDID_VER_CEA861     = 1,
  39         CEA_EDID_VER_CEA861A    = 2,
  40         CEA_EDID_VER_CEA861BCD  = 3,
  41         CEA_EDID_VER_RESERVED   = 4,
  42 };
  43
  44 static char *cea_speaker_allocation_names[] = {
  45         /*  0 */ "FL/FR",
  46         /*  1 */ "LFE",
  47         /*  2 */ "FC",
  48         /*  3 */ "RL/RR",
  49         /*  4 */ "RC",
  50         /*  5 */ "FLC/FRC",
  51         /*  6 */ "RLC/RRC",
  52         /*  7 */ "FLW/FRW",
  53         /*  8 */ "FLH/FRH",
  54         /*  9 */ "TC",
  55         /* 10 */ "FCH",
  56 };
  57
  58 static char *eld_connection_type_names[4] = {
  59         "HDMI",
  60         "DisplayPort",
  61         "2-reserved",
  62         "3-reserved"
  63 };
  64
  65 enum cea_audio_coding_types {
  66         AUDIO_CODING_TYPE_REF_STREAM_HEADER     =  0,
  67         AUDIO_CODING_TYPE_LPCM                  =  1,
  68         AUDIO_CODING_TYPE_AC3                   =  2,
  69         AUDIO_CODING_TYPE_MPEG1                 =  3,
  70         AUDIO_CODING_TYPE_MP3                   =  4,
  71         AUDIO_CODING_TYPE_MPEG2                 =  5,
  72         AUDIO_CODING_TYPE_AACLC                 =  6,
  73         AUDIO_CODING_TYPE_DTS                   =  7,
  74         AUDIO_CODING_TYPE_ATRAC                 =  8,
  75         AUDIO_CODING_TYPE_SACD                  =  9,
  76         AUDIO_CODING_TYPE_EAC3                  = 10,
  77         AUDIO_CODING_TYPE_DTS_HD                = 11,
  78         AUDIO_CODING_TYPE_MLP                   = 12,
  79         AUDIO_CODING_TYPE_DST                   = 13,
  80         AUDIO_CODING_TYPE_WMAPRO                = 14,
  81         AUDIO_CODING_TYPE_REF_CXT               = 15,
  82         /* also include valid xtypes below */
  83         AUDIO_CODING_TYPE_HE_AAC                = 15,
  84         AUDIO_CODING_TYPE_HE_AAC2               = 16,
  85         AUDIO_CODING_TYPE_MPEG_SURROUND         = 17,
  86 };
  87
  88 enum cea_audio_coding_xtypes {
  89         AUDIO_CODING_XTYPE_HE_REF_CT            = 0,
  90         AUDIO_CODING_XTYPE_HE_AAC               = 1,
  91         AUDIO_CODING_XTYPE_HE_AAC2              = 2,
  92         AUDIO_CODING_XTYPE_MPEG_SURROUND        = 3,
  93         AUDIO_CODING_XTYPE_FIRST_RESERVED       = 4,
  94 };
  95
  96 static char *cea_audio_coding_type_names[] = {
  97         /*  0 */ "undefined",
  98         /*  1 */ "LPCM",
  99         /*  2 */ "AC-3",
 100         /*  3 */ "MPEG1",
 101         /*  4 */ "MP3",
 102         /*  5 */ "MPEG2",
 103         /*  6 */ "AAC-LC",
 104         /*  7 */ "DTS",
 105         /*  8 */ "ATRAC",
 106         /*  9 */ "DSD (One Bit Audio)",
 107         /* 10 */ "E-AC-3/DD+ (Dolby Digital Plus)",
 108         /* 11 */ "DTS-HD",
 109         /* 12 */ "MLP (Dolby TrueHD)",
 110         /* 13 */ "DST",
 111         /* 14 */ "WMAPro",
 112         /* 15 */ "HE-AAC",
 113         /* 16 */ "HE-AACv2",
 114         /* 17 */ "MPEG Surround",
 115 };
 116
 117 /*
 118  * The following two lists are shared between
 119  *      - HDMI audio InfoFrame (source to sink)
 120  *      - CEA E-EDID Extension (sink to source)
 121  */
 122
 123 /*
 124  * SS1:SS0 index => sample size
 125  */
 126 static int cea_sample_sizes[4] = {
 127         0,                      /* 0: Refer to Stream Header */
 128         AC_SUPPCM_BITS_16,      /* 1: 16 bits */
 129         AC_SUPPCM_BITS_20,      /* 2: 20 bits */
 130         AC_SUPPCM_BITS_24,      /* 3: 24 bits */
 131 };
 132
 133 /*
 134  * SF2:SF1:SF0 index => sampling frequency
 135  */
 136 static int cea_sampling_frequencies[8] = {
 137         0,                      /* 0: Refer to Stream Header */
 138         SNDRV_PCM_RATE_32000,   /* 1:  32000Hz */
 139         SNDRV_PCM_RATE_44100,   /* 2:  44100Hz */
 140         SNDRV_PCM_RATE_48000,   /* 3:  48000Hz */
 141         SNDRV_PCM_RATE_88200,   /* 4:  88200Hz */
 142         SNDRV_PCM_RATE_96000,   /* 5:  96000Hz */
 143         SNDRV_PCM_RATE_176400,  /* 6: 176400Hz */
 144         SNDRV_PCM_RATE_192000,  /* 7: 192000Hz */
 145 };
 146
 147 static unsigned int hdmi_get_eld_data(struct hda_codec *codec, hda_nid_t nid,
 148                                         int byte_index)
 149 {
 150         unsigned int val;
 151
 152         val = snd_hda_codec_read(codec, nid, 0,
 153                                         AC_VERB_GET_HDMI_ELDD, byte_index);
 154 #ifdef BE_PARANOID
 155         printk(KERN_INFO "HDMI: ELD data byte %d: 0x%x\n", byte_index, val);
 156 #endif
 157         return val;
 158 }
 159
 160 #define GRAB_BITS(buf, byte, lowbit, bits)              \
 161 ({                                                      \
 162         BUILD_BUG_ON(lowbit > 7);                       \
 163         BUILD_BUG_ON(bits > 8);                         \
 164         BUILD_BUG_ON(bits <= 0);                        \
 165                                                         \
 166         (buf[byte] >> (lowbit)) & ((1 << (bits)) - 1);  \
 167 })
 168
 169 static void hdmi_update_short_audio_desc(struct cea_sad *a,
 170                                          const unsigned char *buf)
 171 {
 172         int i;
 173         int val;
 174
 175         val = GRAB_BITS(buf, 1, 0, 7);
 176         a->rates = 0;
 177         for (i = 0; i < 7; i++)
 178                 if (val & (1 << i))
 179                         a->rates |= cea_sampling_frequencies[i + 1];
 180
 181         a->channels = GRAB_BITS(buf, 0, 0, 3);
 182         a->channels++;
 183
 184         a->sample_bits = 0;
 185         a->max_bitrate = 0;
 186
 187         a->format = GRAB_BITS(buf, 0, 3, 4);
 188         switch (a->format) {
 189         case AUDIO_CODING_TYPE_REF_STREAM_HEADER:
 190                 snd_printd(KERN_INFO
 191                                 "HDMI: audio coding type 0 not expected\n");
 192                 break;
 193
 194         case AUDIO_CODING_TYPE_LPCM:
 195                 val = GRAB_BITS(buf, 2, 0, 3);
 196                 for (i = 0; i < 3; i++)
 197                         if (val & (1 << i))
 198                                 a->sample_bits |= cea_sample_sizes[i + 1];
 199                 break;
 200
 201         case AUDIO_CODING_TYPE_AC3:
 202         case AUDIO_CODING_TYPE_MPEG1:
 203         case AUDIO_CODING_TYPE_MP3:
 204         case AUDIO_CODING_TYPE_MPEG2:
 205         case AUDIO_CODING_TYPE_AACLC:
 206         case AUDIO_CODING_TYPE_DTS:
 207         case AUDIO_CODING_TYPE_ATRAC:
 208                 a->max_bitrate = GRAB_BITS(buf, 2, 0, 8);
 209                 a->max_bitrate *= 8000;
 210                 break;
 211
 212         case AUDIO_CODING_TYPE_SACD:
 213                 break;
 214
 215         case AUDIO_CODING_TYPE_EAC3:
 216                 break;
 217
 218         case AUDIO_CODING_TYPE_DTS_HD:
 219                 break;
 220
 221         case AUDIO_CODING_TYPE_MLP:
 222                 break;
 223
 224         case AUDIO_CODING_TYPE_DST:
 225                 break;
 226
 227         case AUDIO_CODING_TYPE_WMAPRO:
 228                 a->profile = GRAB_BITS(buf, 2, 0, 3);
 229                 break;
 230
 231         case AUDIO_CODING_TYPE_REF_CXT:
 232                 a->format = GRAB_BITS(buf, 2, 3, 5);
 233                 if (a->format == AUDIO_CODING_XTYPE_HE_REF_CT ||
 234                     a->format >= AUDIO_CODING_XTYPE_FIRST_RESERVED) {
 235                         snd_printd(KERN_INFO
 236                                 "HDMI: audio coding xtype %d not expected\n",
 237                                 a->format);
 238                         a->format = 0;
 239                 } else
 240                         a->format += AUDIO_CODING_TYPE_HE_AAC -
 241                                      AUDIO_CODING_XTYPE_HE_AAC;
 242                 break;
 243         }
 244 }
 245
 246 /*
 247  * Be careful, ELD buf could be totally rubbish!
 248  */
 249 int snd_hdmi_parse_eld(struct parsed_hdmi_eld *e,
 250                           const unsigned char *buf, int size)
 251 {
 252         int mnl;
 253         int i;
 254
 255         e->eld_ver = GRAB_BITS(buf, 0, 3, 5);
 256         if (e->eld_ver != ELD_VER_CEA_861D &&
 257             e->eld_ver != ELD_VER_PARTIAL) {
 258                 snd_printd(KERN_INFO "HDMI: Unknown ELD version %d\n",
 259                                                                 e->eld_ver);
 260                 goto out_fail;
 261         }
 262
 263         e->baseline_len = GRAB_BITS(buf, 2, 0, 8);
 264         mnl             = GRAB_BITS(buf, 4, 0, 5);
 265         e->cea_edid_ver = GRAB_BITS(buf, 4, 5, 3);
 266
 267         e->support_hdcp = GRAB_BITS(buf, 5, 0, 1);
 268         e->support_ai   = GRAB_BITS(buf, 5, 1, 1);
 269         e->conn_type    = GRAB_BITS(buf, 5, 2, 2);
 270         e->sad_count    = GRAB_BITS(buf, 5, 4, 4);
 271
 272         e->aud_synch_delay = GRAB_BITS(buf, 6, 0, 8) * 2;
 273         e->spk_alloc    = GRAB_BITS(buf, 7, 0, 7);
 274
 275         e->port_id        = get_unaligned_le64(buf + 8);
 276
 277         /* not specified, but the spec's tendency is little endian */
 278         e->manufacture_id = get_unaligned_le16(buf + 16);
 279         e->product_id     = get_unaligned_le16(buf + 18);
 280
 281         if (mnl > ELD_MAX_MNL) {
 282                 snd_printd(KERN_INFO "HDMI: MNL is reserved value %d\n", mnl);
 283                 goto out_fail;
 284         } else if (ELD_FIXED_BYTES + mnl > size) {
 285                 snd_printd(KERN_INFO "HDMI: out of range MNL %d\n", mnl);
 286                 goto out_fail;
 287         } else
 288                 strlcpy(e->monitor_name, buf + ELD_FIXED_BYTES, mnl + 1);
 289
 290         for (i = 0; i < e->sad_count; i++) {
 291                 if (ELD_FIXED_BYTES + mnl + 3 * (i + 1) > size) {
 292                         snd_printd(KERN_INFO "HDMI: out of range SAD %d\n", i);
 293                         goto out_fail;
 294                 }
 295                 hdmi_update_short_audio_desc(e->sad + i,
 296                                         buf + ELD_FIXED_BYTES + mnl + 3 * i);
 297         }
 298
 299         /*
 300          * HDMI sink's ELD info cannot always be retrieved for now, e.g.
 301          * in console or for audio devices. Assume the highest speakers
 302          * configuration, to _not_ prohibit multi-channel audio playback.
 303          */
 304         if (!e->spk_alloc)
 305                 e->spk_alloc = 0xffff;
 306
 307         return 0;
 308
 309 out_fail:
 310         return -EINVAL;
 311 }
 312
 313 int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid)
 314 {
 315         return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_SIZE,
 316                                                  AC_DIPSIZE_ELD_BUF);
 317 }
 318
 319 int snd_hdmi_get_eld(struct hda_codec *codec, hda_nid_t nid,
 320                      unsigned char *buf, int *eld_size)
 321 {
 322         int i;
 323         int ret = 0;
 324         int size;
 325
 326         /*
 327          * ELD size is initialized to zero in caller function. If no errors and
 328          * ELD is valid, actual eld_size is assigned.
 329          */
 330
 331         size = snd_hdmi_get_eld_size(codec, nid);
 332         if (size == 0) {
 333                 /* wfg: workaround for ASUS P5E-VM HDMI board */
 334                 snd_printd(KERN_INFO "HDMI: ELD buf size is 0, force 128\n");
 335                 size = 128;
 336         }
 337         if (size < ELD_FIXED_BYTES || size > ELD_MAX_SIZE) {
 338                 snd_printd(KERN_INFO "HDMI: invalid ELD buf size %d\n", size);
 339                 return -ERANGE;
 340         }
 341
 342         /* set ELD buffer */
 343         for (i = 0; i < size; i++) {
 344                 unsigned int val = hdmi_get_eld_data(codec, nid, i);
 345                 /*
 346                  * Graphics driver might be writing to ELD buffer right now.
 347                  * Just abort. The caller will repoll after a while.
 348                  */
 349                 if (!(val & AC_ELDD_ELD_VALID)) {
 350                         snd_printd(KERN_INFO
 351                                   "HDMI: invalid ELD data byte %d\n", i);
 352                         ret = -EINVAL;
 353                         goto error;
 354                 }
 355                 val &= AC_ELDD_ELD_DATA;
 356                 /*
 357                  * The first byte cannot be zero. This can happen on some DVI
 358                  * connections. Some Intel chips may also need some 250ms delay
 359                  * to return non-zero ELD data, even when the graphics driver
 360                  * correctly writes ELD content before setting ELD_valid bit.
 361                  */
 362                 if (!val && !i) {
 363                         snd_printdd(KERN_INFO "HDMI: 0 ELD data\n");
 364                         ret = -EINVAL;
 365                         goto error;
 366                 }
 367                 buf[i] = val;
 368         }
 369
 370         *eld_size = size;
 371 error:
 372         return ret;
 373 }
 374
 375 /**
 376  * SNDRV_PCM_RATE_* and AC_PAR_PCM values don't match, print correct rates with
 377  * hdmi-specific routine.
 378  */
 379 static void hdmi_print_pcm_rates(int pcm, char *buf, int buflen)
 380 {
 381         static unsigned int alsa_rates[] = {
 382                 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000, 64000,
 383                 88200, 96000, 176400, 192000, 384000
 384         };
 385         int i, j;
 386
 387         for (i = 0, j = 0; i < ARRAY_SIZE(alsa_rates); i++)
 388                 if (pcm & (1 << i))
 389                         j += snprintf(buf + j, buflen - j,  " %d",
 390                                 alsa_rates[i]);
 391
 392         buf[j] = '\0'; /* necessary when j == 0 */
 393 }
 394
 395 #define SND_PRINT_RATES_ADVISED_BUFSIZE 80
 396
 397 static void hdmi_show_short_audio_desc(struct cea_sad *a)
 398 {
 399         char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
 400         char buf2[8 + SND_PRINT_BITS_ADVISED_BUFSIZE] = ", bits =";
 401
 402         if (!a->format)
 403                 return;
 404
 405         hdmi_print_pcm_rates(a->rates, buf, sizeof(buf));
 406
 407         if (a->format == AUDIO_CODING_TYPE_LPCM)
 408                 snd_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2) - 8);
 409         else if (a->max_bitrate)
 410                 snprintf(buf2, sizeof(buf2),
 411                                 ", max bitrate = %d", a->max_bitrate);
 412         else
 413                 buf2[0] = '\0';
 414
 415         _snd_printd(SND_PR_VERBOSE, "HDMI: supports coding type %s:"
 416                         " channels = %d, rates =%s%s\n",
 417                         cea_audio_coding_type_names[a->format],
 418                         a->channels,
 419                         buf,
 420                         buf2);
 421 }
 422
 423 void snd_print_channel_allocation(int spk_alloc, char *buf, int buflen)
 424 {
 425         int i, j;
 426
 427         for (i = 0, j = 0; i < ARRAY_SIZE(cea_speaker_allocation_names); i++) {
 428                 if (spk_alloc & (1 << i))
 429                         j += snprintf(buf + j, buflen - j,  " %s",
 430                                         cea_speaker_allocation_names[i]);
 431         }
 432         buf[j] = '\0';  /* necessary when j == 0 */
 433 }
 434
 435 void snd_hdmi_show_eld(struct parsed_hdmi_eld *e)
 436 {
 437         int i;
 438
 439         _snd_printd(SND_PR_VERBOSE, "HDMI: detected monitor %s at connection type %s\n",
 440                         e->monitor_name,
 441                         eld_connection_type_names[e->conn_type]);
 442
 443         if (e->spk_alloc) {
 444                 char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
 445                 snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
 446                 _snd_printd(SND_PR_VERBOSE, "HDMI: available speakers:%s\n", buf);
 447         }
 448
 449         for (i = 0; i < e->sad_count; i++)
 450                 hdmi_show_short_audio_desc(e->sad + i);
 451 }
 452
 453 #ifdef CONFIG_PROC_FS
 454
 455 static void hdmi_print_sad_info(int i, struct cea_sad *a,
 456                                 struct snd_info_buffer *buffer)
 457 {
 458         char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
 459
 460         snd_iprintf(buffer, "sad%d_coding_type\t[0x%x] %s\n",
 461                         i, a->format, cea_audio_coding_type_names[a->format]);
 462         snd_iprintf(buffer, "sad%d_channels\t\t%d\n", i, a->channels);
 463
 464         hdmi_print_pcm_rates(a->rates, buf, sizeof(buf));
 465         snd_iprintf(buffer, "sad%d_rates\t\t[0x%x]%s\n", i, a->rates, buf);
 466
 467         if (a->format == AUDIO_CODING_TYPE_LPCM) {
 468                 snd_print_pcm_bits(a->sample_bits, buf, sizeof(buf));
 469                 snd_iprintf(buffer, "sad%d_bits\t\t[0x%x]%s\n",
 470                                                         i, a->sample_bits, buf);
 471         }
 472
 473         if (a->max_bitrate)
 474                 snd_iprintf(buffer, "sad%d_max_bitrate\t%d\n",
 475                                                         i, a->max_bitrate);
 476
 477         if (a->profile)
 478                 snd_iprintf(buffer, "sad%d_profile\t\t%d\n", i, a->profile);
 479 }
 480
 481 void snd_hdmi_print_eld_info(struct hdmi_eld *eld,
 482                              struct snd_info_buffer *buffer)
 483 {
 484         struct parsed_hdmi_eld *e = &eld->info;
 485         char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
 486         int i;
 487         static char *eld_version_names[32] = {
 488                 "reserved",
 489                 "reserved",
 490                 "CEA-861D or below",
 491                 [3 ... 30] = "reserved",
 492                 [31] = "partial"
 493         };
 494         static char *cea_edid_version_names[8] = {
 495                 "no CEA EDID Timing Extension block present",
 496                 "CEA-861",
 497                 "CEA-861-A",
 498                 "CEA-861-B, C or D",
 499                 [4 ... 7] = "reserved"
 500         };
 501
 502         snd_iprintf(buffer, "monitor_present\t\t%d\n", eld->monitor_present);
 503         snd_iprintf(buffer, "eld_valid\t\t%d\n", eld->eld_valid);
 504         if (!eld->eld_valid)
 505                 return;
 506         snd_iprintf(buffer, "monitor_name\t\t%s\n", e->monitor_name);
 507         snd_iprintf(buffer, "connection_type\t\t%s\n",
 508                                 eld_connection_type_names[e->conn_type]);
 509         snd_iprintf(buffer, "eld_version\t\t[0x%x] %s\n", e->eld_ver,
 510                                         eld_version_names[e->eld_ver]);
 511         snd_iprintf(buffer, "edid_version\t\t[0x%x] %s\n", e->cea_edid_ver,
 512                                 cea_edid_version_names[e->cea_edid_ver]);
 513         snd_iprintf(buffer, "manufacture_id\t\t0x%x\n", e->manufacture_id);
 514         snd_iprintf(buffer, "product_id\t\t0x%x\n", e->product_id);
 515         snd_iprintf(buffer, "port_id\t\t\t0x%llx\n", (long long)e->port_id);
 516         snd_iprintf(buffer, "support_hdcp\t\t%d\n", e->support_hdcp);
 517         snd_iprintf(buffer, "support_ai\t\t%d\n", e->support_ai);
 518         snd_iprintf(buffer, "audio_sync_delay\t%d\n", e->aud_synch_delay);
 519
 520         snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
 521         snd_iprintf(buffer, "speakers\t\t[0x%x]%s\n", e->spk_alloc, buf);
 522
 523         snd_iprintf(buffer, "sad_count\t\t%d\n", e->sad_count);
 524
 525         for (i = 0; i < e->sad_count; i++)
 526                 hdmi_print_sad_info(i, e->sad + i, buffer);
 527 }
 528
 529 void snd_hdmi_write_eld_info(struct hdmi_eld *eld,
 530                              struct snd_info_buffer *buffer)
 531 {
 532         struct parsed_hdmi_eld *e = &eld->info;
 533         char line[64];
 534         char name[64];
 535         char *sname;
 536         long long val;
 537         unsigned int n;
 538
 539         while (!snd_info_get_line(buffer, line, sizeof(line))) {
 540                 if (sscanf(line, "%s %llx", name, &val) != 2)
 541                         continue;
 542                 /*
 543                  * We don't allow modification to these fields:
 544                  *      monitor_name manufacture_id product_id
 545                  *      eld_version edid_version
 546                  */
 547                 if (!strcmp(name, "monitor_present"))
 548                         eld->monitor_present = val;
 549                 else if (!strcmp(name, "eld_valid"))
 550                         eld->eld_valid = val;
 551                 else if (!strcmp(name, "connection_type"))
 552                         e->conn_type = val;
 553                 else if (!strcmp(name, "port_id"))
 554                         e->port_id = val;
 555                 else if (!strcmp(name, "support_hdcp"))
 556                         e->support_hdcp = val;
 557                 else if (!strcmp(name, "support_ai"))
 558                         e->support_ai = val;
 559                 else if (!strcmp(name, "audio_sync_delay"))
 560                         e->aud_synch_delay = val;
 561                 else if (!strcmp(name, "speakers"))
 562                         e->spk_alloc = val;
 563                 else if (!strcmp(name, "sad_count"))
 564                         e->sad_count = val;
 565                 else if (!strncmp(name, "sad", 3)) {
 566                         sname = name + 4;
 567                         n = name[3] - '0';
 568                         if (name[4] >= '0' && name[4] <= '9') {
 569                                 sname++;
 570                                 n = 10 * n + name[4] - '0';
 571                         }
 572                         if (n >= ELD_MAX_SAD)
 573                                 continue;
 574                         if (!strcmp(sname, "_coding_type"))
 575                                 e->sad[n].format = val;
 576                         else if (!strcmp(sname, "_channels"))
 577                                 e->sad[n].channels = val;
 578                         else if (!strcmp(sname, "_rates"))
 579                                 e->sad[n].rates = val;
 580                         else if (!strcmp(sname, "_bits"))
 581                                 e->sad[n].sample_bits = val;
 582                         else if (!strcmp(sname, "_max_bitrate"))
 583                                 e->sad[n].max_bitrate = val;
 584                         else if (!strcmp(sname, "_profile"))
 585                                 e->sad[n].profile = val;
 586                         if (n >= e->sad_count)
 587                                 e->sad_count = n + 1;
 588                 }
 589         }
 590 }
 591 #endif /* CONFIG_PROC_FS */
 592
 593 /* update PCM info based on ELD */
 594 void snd_hdmi_eld_update_pcm_info(struct parsed_hdmi_eld *e,
 595                               struct hda_pcm_stream *hinfo)
 596 {
 597         u32 rates;
 598         u64 formats;
 599         unsigned int maxbps;
 600         unsigned int channels_max;
 601         int i;
 602
 603         /* assume basic audio support (the basic audio flag is not in ELD;
 604          * however, all audio capable sinks are required to support basic
 605          * audio) */
 606         rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
 607                 SNDRV_PCM_RATE_48000;
 608         formats = SNDRV_PCM_FMTBIT_S16_LE;
 609         maxbps = 16;
 610         channels_max = 2;
 611         for (i = 0; i < e->sad_count; i++) {
 612                 struct cea_sad *a = &e->sad[i];
 613                 rates |= a->rates;
 614                 if (a->channels > channels_max)
 615                         channels_max = a->channels;
 616                 if (a->format == AUDIO_CODING_TYPE_LPCM) {
 617                         if (a->sample_bits & AC_SUPPCM_BITS_20) {
 618                                 formats |= SNDRV_PCM_FMTBIT_S32_LE;
 619                                 if (maxbps < 20)
 620                                         maxbps = 20;
 621                         }
 622                         if (a->sample_bits & AC_SUPPCM_BITS_24) {
 623                                 formats |= SNDRV_PCM_FMTBIT_S32_LE;
 624                                 if (maxbps < 24)
 625                                         maxbps = 24;
 626                         }
 627                 }
 628         }
 629
 630         /* restrict the parameters by the values the codec provides */
 631         hinfo->rates &= rates;
 632         hinfo->formats &= formats;
 633         hinfo->maxbps = min(hinfo->maxbps, maxbps);
 634         hinfo->channels_max = min(hinfo->channels_max, channels_max);
 635 }