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 char hdmi_get_eld_byte(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
 155 #ifdef BE_PARANOID
 156         printk(KERN_INFO "HDMI: ELD data byte %d: 0x%x\n", byte_index, val);
 157 #endif
 158
 159         if ((val & AC_ELDD_ELD_VALID) == 0) {
 160                 snd_printd(KERN_INFO "HDMI: invalid ELD data byte %d\n",
 161                                                                 byte_index);
 162                 val = 0;
 163         }
 164
 165         return val & AC_ELDD_ELD_DATA;
 166 }
 167
 168 #define GRAB_BITS(buf, byte, lowbit, bits)              \
 169 ({                                                      \
 170         BUILD_BUG_ON(lowbit > 7);                       \
 171         BUILD_BUG_ON(bits > 8);                         \
 172         BUILD_BUG_ON(bits <= 0);                        \
 173                                                         \
 174         (buf[byte] >> (lowbit)) & ((1 << (bits)) - 1);  \
 175 })
 176
 177 static void hdmi_update_short_audio_desc(struct cea_sad *a,
 178                                          const unsigned char *buf)
 179 {
 180         int i;
 181         int val;
 182
 183         val = GRAB_BITS(buf, 1, 0, 7);
 184         a->rates = 0;
 185         for (i = 0; i < 7; i++)
 186                 if (val & (1 << i))
 187                         a->rates |= cea_sampling_frequencies[i + 1];
 188
 189         a->channels = GRAB_BITS(buf, 0, 0, 3);
 190         a->channels++;
 191
 192         a->sample_bits = 0;
 193         a->max_bitrate = 0;
 194
 195         a->format = GRAB_BITS(buf, 0, 3, 4);
 196         switch (a->format) {
 197         case AUDIO_CODING_TYPE_REF_STREAM_HEADER:
 198                 snd_printd(KERN_INFO
 199                                 "HDMI: audio coding type 0 not expected\n");
 200                 break;
 201
 202         case AUDIO_CODING_TYPE_LPCM:
 203                 val = GRAB_BITS(buf, 2, 0, 3);
 204                 for (i = 0; i < 3; i++)
 205                         if (val & (1 << i))
 206                                 a->sample_bits |= cea_sample_sizes[i + 1];
 207                 break;
 208
 209         case AUDIO_CODING_TYPE_AC3:
 210         case AUDIO_CODING_TYPE_MPEG1:
 211         case AUDIO_CODING_TYPE_MP3:
 212         case AUDIO_CODING_TYPE_MPEG2:
 213         case AUDIO_CODING_TYPE_AACLC:
 214         case AUDIO_CODING_TYPE_DTS:
 215         case AUDIO_CODING_TYPE_ATRAC:
 216                 a->max_bitrate = GRAB_BITS(buf, 2, 0, 8);
 217                 a->max_bitrate *= 8000;
 218                 break;
 219
 220         case AUDIO_CODING_TYPE_SACD:
 221                 break;
 222
 223         case AUDIO_CODING_TYPE_EAC3:
 224                 break;
 225
 226         case AUDIO_CODING_TYPE_DTS_HD:
 227                 break;
 228
 229         case AUDIO_CODING_TYPE_MLP:
 230                 break;
 231
 232         case AUDIO_CODING_TYPE_DST:
 233                 break;
 234
 235         case AUDIO_CODING_TYPE_WMAPRO:
 236                 a->profile = GRAB_BITS(buf, 2, 0, 3);
 237                 break;
 238
 239         case AUDIO_CODING_TYPE_REF_CXT:
 240                 a->format = GRAB_BITS(buf, 2, 3, 5);
 241                 if (a->format == AUDIO_CODING_XTYPE_HE_REF_CT ||
 242                     a->format >= AUDIO_CODING_XTYPE_FIRST_RESERVED) {
 243                         snd_printd(KERN_INFO
 244                                 "HDMI: audio coding xtype %d not expected\n",
 245                                 a->format);
 246                         a->format = 0;
 247                 } else
 248                         a->format += AUDIO_CODING_TYPE_HE_AAC -
 249                                      AUDIO_CODING_XTYPE_HE_AAC;
 250                 break;
 251         }
 252 }
 253
 254 /*
 255  * Be careful, ELD buf could be totally rubbish!
 256  */
 257 static int hdmi_update_eld(struct hdmi_eld *e,
 258                            const unsigned char *buf, int size)
 259 {
 260         int mnl;
 261         int i;
 262
 263         e->eld_ver = GRAB_BITS(buf, 0, 3, 5);
 264         if (e->eld_ver != ELD_VER_CEA_861D &&
 265             e->eld_ver != ELD_VER_PARTIAL) {
 266                 snd_printd(KERN_INFO "HDMI: Unknown ELD version %d\n",
 267                                                                 e->eld_ver);
 268                 goto out_fail;
 269         }
 270
 271         e->eld_size = size;
 272         e->baseline_len = GRAB_BITS(buf, 2, 0, 8);
 273         mnl             = GRAB_BITS(buf, 4, 0, 5);
 274         e->cea_edid_ver = GRAB_BITS(buf, 4, 5, 3);
 275
 276         e->support_hdcp = GRAB_BITS(buf, 5, 0, 1);
 277         e->support_ai   = GRAB_BITS(buf, 5, 1, 1);
 278         e->conn_type    = GRAB_BITS(buf, 5, 2, 2);
 279         e->sad_count    = GRAB_BITS(buf, 5, 4, 4);
 280
 281         e->aud_synch_delay = GRAB_BITS(buf, 6, 0, 8) * 2;
 282         e->spk_alloc    = GRAB_BITS(buf, 7, 0, 7);
 283
 284         e->port_id        = get_unaligned_le64(buf + 8);
 285
 286         /* not specified, but the spec's tendency is little endian */
 287         e->manufacture_id = get_unaligned_le16(buf + 16);
 288         e->product_id     = get_unaligned_le16(buf + 18);
 289
 290         if (mnl > ELD_MAX_MNL) {
 291                 snd_printd(KERN_INFO "HDMI: MNL is reserved value %d\n", mnl);
 292                 goto out_fail;
 293         } else if (ELD_FIXED_BYTES + mnl > size) {
 294                 snd_printd(KERN_INFO "HDMI: out of range MNL %d\n", mnl);
 295                 goto out_fail;
 296         } else
 297                 strlcpy(e->monitor_name, buf + ELD_FIXED_BYTES, mnl + 1);
 298
 299         for (i = 0; i < e->sad_count; i++) {
 300                 if (ELD_FIXED_BYTES + mnl + 3 * (i + 1) > size) {
 301                         snd_printd(KERN_INFO "HDMI: out of range SAD %d\n", i);
 302                         goto out_fail;
 303                 }
 304                 hdmi_update_short_audio_desc(e->sad + i,
 305                                         buf + ELD_FIXED_BYTES + mnl + 3 * i);
 306         }
 307
 308         return 0;
 309
 310 out_fail:
 311         e->eld_ver = 0;
 312         return -EINVAL;
 313 }
 314
 315 int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid)
 316 {
 317         return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_SIZE,
 318                                                  AC_DIPSIZE_ELD_BUF);
 319 }
 320
 321 int snd_hdmi_get_eld(struct hdmi_eld *eld,
 322                      struct hda_codec *codec, hda_nid_t nid)
 323 {
 324         int i;
 325         int ret;
 326         int size;
 327         unsigned char *buf;
 328
 329         if (!eld->eld_valid)
 330                 return -ENOENT;
 331
 332         size = snd_hdmi_get_eld_size(codec, nid);
 333         if (size == 0) {
 334                 /* wfg: workaround for ASUS P5E-VM HDMI board */
 335                 snd_printd(KERN_INFO "HDMI: ELD buf size is 0, force 128\n");
 336                 size = 128;
 337         }
 338         if (size < ELD_FIXED_BYTES || size > PAGE_SIZE) {
 339                 snd_printd(KERN_INFO "HDMI: invalid ELD buf size %d\n", size);
 340                 return -ERANGE;
 341         }
 342
 343         buf = kmalloc(size, GFP_KERNEL);
 344         if (!buf)
 345                 return -ENOMEM;
 346
 347         for (i = 0; i < size; i++)
 348                 buf[i] = hdmi_get_eld_byte(codec, nid, i);
 349
 350         ret = hdmi_update_eld(eld, buf, size);
 351
 352         kfree(buf);
 353         return ret;
 354 }
 355
 356 static void hdmi_show_short_audio_desc(struct cea_sad *a)
 357 {
 358         char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
 359         char buf2[8 + SND_PRINT_BITS_ADVISED_BUFSIZE] = ", bits =";
 360
 361         if (!a->format)
 362                 return;
 363
 364         snd_print_pcm_rates(a->rates, buf, sizeof(buf));
 365
 366         if (a->format == AUDIO_CODING_TYPE_LPCM)
 367                 snd_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2) - 8);
 368         else if (a->max_bitrate)
 369                 snprintf(buf2, sizeof(buf2),
 370                                 ", max bitrate = %d", a->max_bitrate);
 371         else
 372                 buf2[0] = '\0';
 373
 374         printk(KERN_INFO "HDMI: supports coding type %s:"
 375                         " channels = %d, rates =%s%s\n",
 376                         cea_audio_coding_type_names[a->format],
 377                         a->channels,
 378                         buf,
 379                         buf2);
 380 }
 381
 382 void snd_print_channel_allocation(int spk_alloc, char *buf, int buflen)
 383 {
 384         int i, j;
 385
 386         for (i = 0, j = 0; i < ARRAY_SIZE(cea_speaker_allocation_names); i++) {
 387                 if (spk_alloc & (1 << i))
 388                         j += snprintf(buf + j, buflen - j,  " %s",
 389                                         cea_speaker_allocation_names[i]);
 390         }
 391         buf[j] = '\0';  /* necessary when j == 0 */
 392 }
 393
 394 void snd_hdmi_show_eld(struct hdmi_eld *e)
 395 {
 396         int i;
 397
 398         printk(KERN_INFO "HDMI: detected monitor %s at connection type %s\n",
 399                         e->monitor_name,
 400                         eld_connection_type_names[e->conn_type]);
 401
 402         if (e->spk_alloc) {
 403                 char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
 404                 snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
 405                 printk(KERN_INFO "HDMI: available speakers:%s\n", buf);
 406         }
 407
 408         for (i = 0; i < e->sad_count; i++)
 409                 hdmi_show_short_audio_desc(e->sad + i);
 410 }
 411
 412 #ifdef CONFIG_PROC_FS
 413
 414 static void hdmi_print_sad_info(int i, struct cea_sad *a,
 415                                 struct snd_info_buffer *buffer)
 416 {
 417         char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
 418
 419         snd_iprintf(buffer, "sad%d_coding_type\t[0x%x] %s\n",
 420                         i, a->format, cea_audio_coding_type_names[a->format]);
 421         snd_iprintf(buffer, "sad%d_channels\t\t%d\n", i, a->channels);
 422
 423         snd_print_pcm_rates(a->rates, buf, sizeof(buf));
 424         snd_iprintf(buffer, "sad%d_rates\t\t[0x%x]%s\n", i, a->rates, buf);
 425
 426         if (a->format == AUDIO_CODING_TYPE_LPCM) {
 427                 snd_print_pcm_bits(a->sample_bits, buf, sizeof(buf));
 428                 snd_iprintf(buffer, "sad%d_bits\t\t[0x%x]%s\n",
 429                                                         i, a->sample_bits, buf);
 430         }
 431
 432         if (a->max_bitrate)
 433                 snd_iprintf(buffer, "sad%d_max_bitrate\t%d\n",
 434                                                         i, a->max_bitrate);
 435
 436         if (a->profile)
 437                 snd_iprintf(buffer, "sad%d_profile\t\t%d\n", i, a->profile);
 438 }
 439
 440 static void hdmi_print_eld_info(struct snd_info_entry *entry,
 441                                 struct snd_info_buffer *buffer)
 442 {
 443         struct hdmi_eld *e = entry->private_data;
 444         char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
 445         int i;
 446         static char *eld_versoin_names[32] = {
 447                 "reserved",
 448                 "reserved",
 449                 "CEA-861D or below",
 450                 [3 ... 30] = "reserved",
 451                 [31] = "partial"
 452         };
 453         static char *cea_edid_version_names[8] = {
 454                 "no CEA EDID Timing Extension block present",
 455                 "CEA-861",
 456                 "CEA-861-A",
 457                 "CEA-861-B, C or D",
 458                 [4 ... 7] = "reserved"
 459         };
 460
 461         snd_iprintf(buffer, "monitor_present\t\t%d\n", e->monitor_present);
 462         snd_iprintf(buffer, "eld_valid\t\t%d\n", e->eld_valid);
 463         if (!e->eld_valid)
 464                 return;
 465         snd_iprintf(buffer, "monitor_name\t\t%s\n", e->monitor_name);
 466         snd_iprintf(buffer, "connection_type\t\t%s\n",
 467                                 eld_connection_type_names[e->conn_type]);
 468         snd_iprintf(buffer, "eld_version\t\t[0x%x] %s\n", e->eld_ver,
 469                                         eld_versoin_names[e->eld_ver]);
 470         snd_iprintf(buffer, "edid_version\t\t[0x%x] %s\n", e->cea_edid_ver,
 471                                 cea_edid_version_names[e->cea_edid_ver]);
 472         snd_iprintf(buffer, "manufacture_id\t\t0x%x\n", e->manufacture_id);
 473         snd_iprintf(buffer, "product_id\t\t0x%x\n", e->product_id);
 474         snd_iprintf(buffer, "port_id\t\t\t0x%llx\n", (long long)e->port_id);
 475         snd_iprintf(buffer, "support_hdcp\t\t%d\n", e->support_hdcp);
 476         snd_iprintf(buffer, "support_ai\t\t%d\n", e->support_ai);
 477         snd_iprintf(buffer, "audio_sync_delay\t%d\n", e->aud_synch_delay);
 478
 479         snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
 480         snd_iprintf(buffer, "speakers\t\t[0x%x]%s\n", e->spk_alloc, buf);
 481
 482         snd_iprintf(buffer, "sad_count\t\t%d\n", e->sad_count);
 483
 484         for (i = 0; i < e->sad_count; i++)
 485                 hdmi_print_sad_info(i, e->sad + i, buffer);
 486 }
 487
 488 static void hdmi_write_eld_info(struct snd_info_entry *entry,
 489                                 struct snd_info_buffer *buffer)
 490 {
 491         struct hdmi_eld *e = entry->private_data;
 492         char line[64];
 493         char name[64];
 494         char *sname;
 495         long long val;
 496         unsigned int n;
 497
 498         while (!snd_info_get_line(buffer, line, sizeof(line))) {
 499                 if (sscanf(line, "%s %llx", name, &val) != 2)
 500                         continue;
 501                 /*
 502                  * We don't allow modification to these fields:
 503                  *      monitor_name manufacture_id product_id
 504                  *      eld_version edid_version
 505                  */
 506                 if (!strcmp(name, "monitor_present"))
 507                         e->monitor_present = val;
 508                 else if (!strcmp(name, "eld_valid"))
 509                         e->eld_valid = val;
 510                 else if (!strcmp(name, "connection_type"))
 511                         e->conn_type = val;
 512                 else if (!strcmp(name, "port_id"))
 513                         e->port_id = val;
 514                 else if (!strcmp(name, "support_hdcp"))
 515                         e->support_hdcp = val;
 516                 else if (!strcmp(name, "support_ai"))
 517                         e->support_ai = val;
 518                 else if (!strcmp(name, "audio_sync_delay"))
 519                         e->aud_synch_delay = val;
 520                 else if (!strcmp(name, "speakers"))
 521                         e->spk_alloc = val;
 522                 else if (!strcmp(name, "sad_count"))
 523                         e->sad_count = val;
 524                 else if (!strncmp(name, "sad", 3)) {
 525                         sname = name + 4;
 526                         n = name[3] - '0';
 527                         if (name[4] >= '0' && name[4] <= '9') {
 528                                 sname++;
 529                                 n = 10 * n + name[4] - '0';
 530                         }
 531                         if (n >= ELD_MAX_SAD)
 532                                 continue;
 533                         if (!strcmp(sname, "_coding_type"))
 534                                 e->sad[n].format = val;
 535                         else if (!strcmp(sname, "_channels"))
 536                                 e->sad[n].channels = val;
 537                         else if (!strcmp(sname, "_rates"))
 538                                 e->sad[n].rates = val;
 539                         else if (!strcmp(sname, "_bits"))
 540                                 e->sad[n].sample_bits = val;
 541                         else if (!strcmp(sname, "_max_bitrate"))
 542                                 e->sad[n].max_bitrate = val;
 543                         else if (!strcmp(sname, "_profile"))
 544                                 e->sad[n].profile = val;
 545                         if (n >= e->sad_count)
 546                                 e->sad_count = n + 1;
 547                 }
 548         }
 549 }
 550
 551
 552 int snd_hda_eld_proc_new(struct hda_codec *codec, struct hdmi_eld *eld,
 553                          int index)
 554 {
 555         char name[32];
 556         struct snd_info_entry *entry;
 557         int err;
 558
 559         snprintf(name, sizeof(name), "eld#%d.%d", codec->addr, index);
 560         err = snd_card_proc_new(codec->bus->card, name, &entry);
 561         if (err < 0)
 562                 return err;
 563
 564         snd_info_set_text_ops(entry, eld, hdmi_print_eld_info);
 565         entry->c.text.write = hdmi_write_eld_info;
 566         entry->mode |= S_IWUSR;
 567         eld->proc_entry = entry;
 568
 569         return 0;
 570 }
 571
 572 void snd_hda_eld_proc_free(struct hda_codec *codec, struct hdmi_eld *eld)
 573 {
 574         if (!codec->bus->shutdown && eld->proc_entry) {
 575                 snd_device_free(codec->bus->card, eld->proc_entry);
 576                 eld->proc_entry = NULL;
 577         }
 578 }
 579
 580 #endif /* CONFIG_PROC_FS */
 581
 582 /* update PCM info based on ELD */
 583 void snd_hdmi_eld_update_pcm_info(struct hdmi_eld *eld,
 584                               struct hda_pcm_stream *hinfo)
 585 {
 586         u32 rates;
 587         u64 formats;
 588         unsigned int maxbps;
 589         unsigned int channels_max;
 590         int i;
 591
 592         /* assume basic audio support (the basic audio flag is not in ELD;
 593          * however, all audio capable sinks are required to support basic
 594          * audio) */
 595         rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
 596                 SNDRV_PCM_RATE_48000;
 597         formats = SNDRV_PCM_FMTBIT_S16_LE;
 598         maxbps = 16;
 599         channels_max = 2;
 600         for (i = 0; i < eld->sad_count; i++) {
 601                 struct cea_sad *a = &eld->sad[i];
 602                 rates |= a->rates;
 603                 if (a->channels > channels_max)
 604                         channels_max = a->channels;
 605                 if (a->format == AUDIO_CODING_TYPE_LPCM) {
 606                         if (a->sample_bits & AC_SUPPCM_BITS_20) {
 607                                 formats |= SNDRV_PCM_FMTBIT_S32_LE;
 608                                 if (maxbps < 20)
 609                                         maxbps = 20;
 610                         }
 611                         if (a->sample_bits & AC_SUPPCM_BITS_24) {
 612                                 formats |= SNDRV_PCM_FMTBIT_S32_LE;
 613                                 if (maxbps < 24)
 614                                         maxbps = 24;
 615                         }
 616                 }
 617         }
 618
 619         /* restrict the parameters by the values the codec provides */
 620         hinfo->rates &= rates;
 621         hinfo->formats &= formats;
 622         hinfo->maxbps = min(hinfo->maxbps, maxbps);
 623         hinfo->channels_max = min(hinfo->channels_max, channels_max);
 624 }