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 static int hdmi_update_eld(struct 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->eld_size = size;
 264         e->baseline_len = GRAB_BITS(buf, 2, 0, 8);
 265         mnl             = GRAB_BITS(buf, 4, 0, 5);
 266         e->cea_edid_ver = GRAB_BITS(buf, 4, 5, 3);
 267
 268         e->support_hdcp = GRAB_BITS(buf, 5, 0, 1);
 269         e->support_ai   = GRAB_BITS(buf, 5, 1, 1);
 270         e->conn_type    = GRAB_BITS(buf, 5, 2, 2);
 271         e->sad_count    = GRAB_BITS(buf, 5, 4, 4);
 272
 273         e->aud_synch_delay = GRAB_BITS(buf, 6, 0, 8) * 2;
 274         e->spk_alloc    = GRAB_BITS(buf, 7, 0, 7);
 275
 276         e->port_id        = get_unaligned_le64(buf + 8);
 277
 278         /* not specified, but the spec's tendency is little endian */
 279         e->manufacture_id = get_unaligned_le16(buf + 16);
 280         e->product_id     = get_unaligned_le16(buf + 18);
 281
 282         if (mnl > ELD_MAX_MNL) {
 283                 snd_printd(KERN_INFO "HDMI: MNL is reserved value %d\n", mnl);
 284                 goto out_fail;
 285         } else if (ELD_FIXED_BYTES + mnl > size) {
 286                 snd_printd(KERN_INFO "HDMI: out of range MNL %d\n", mnl);
 287                 goto out_fail;
 288         } else
 289                 strlcpy(e->monitor_name, buf + ELD_FIXED_BYTES, mnl + 1);
 290
 291         for (i = 0; i < e->sad_count; i++) {
 292                 if (ELD_FIXED_BYTES + mnl + 3 * (i + 1) > size) {
 293                         snd_printd(KERN_INFO "HDMI: out of range SAD %d\n", i);
 294                         goto out_fail;
 295                 }
 296                 hdmi_update_short_audio_desc(e->sad + i,
 297                                         buf + ELD_FIXED_BYTES + mnl + 3 * i);
 298         }
 299
 300         e->eld_valid = true;
 301         return 0;
 302
 303 out_fail:
 304         return -EINVAL;
 305 }
 306
 307 int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid)
 308 {
 309         return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_SIZE,
 310                                                  AC_DIPSIZE_ELD_BUF);
 311 }
 312
 313 int snd_hdmi_get_eld(struct hdmi_eld *eld,
 314                      struct hda_codec *codec, hda_nid_t nid)
 315 {
 316         int i;
 317         int ret;
 318         int size;
 319         unsigned char *buf;
 320
 321         size = snd_hdmi_get_eld_size(codec, nid);
 322         if (size == 0) {
 323                 /* wfg: workaround for ASUS P5E-VM HDMI board */
 324                 snd_printd(KERN_INFO "HDMI: ELD buf size is 0, force 128\n");
 325                 size = 128;
 326         }
 327         if (size < ELD_FIXED_BYTES || size > PAGE_SIZE) {
 328                 snd_printd(KERN_INFO "HDMI: invalid ELD buf size %d\n", size);
 329                 return -ERANGE;
 330         }
 331
 332         buf = kmalloc(size, GFP_KERNEL);
 333         if (!buf)
 334                 return -ENOMEM;
 335
 336         for (i = 0; i < size; i++) {
 337                 unsigned int val = hdmi_get_eld_data(codec, nid, i);
 338                 if (!(val & AC_ELDD_ELD_VALID)) {
 339                         if (!i) {
 340                                 snd_printd(KERN_INFO
 341                                            "HDMI: invalid ELD data\n");
 342                                 ret = -EINVAL;
 343                                 goto error;
 344                         }
 345                         snd_printd(KERN_INFO
 346                                   "HDMI: invalid ELD data byte %d\n", i);
 347                         val = 0;
 348                 } else
 349                         val &= AC_ELDD_ELD_DATA;
 350                 buf[i] = val;
 351         }
 352
 353         ret = hdmi_update_eld(eld, buf, size);
 354
 355 error:
 356         kfree(buf);
 357         return ret;
 358 }
 359
 360 static void hdmi_show_short_audio_desc(struct cea_sad *a)
 361 {
 362         char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
 363         char buf2[8 + SND_PRINT_BITS_ADVISED_BUFSIZE] = ", bits =";
 364
 365         if (!a->format)
 366                 return;
 367
 368         snd_print_pcm_rates(a->rates, buf, sizeof(buf));
 369
 370         if (a->format == AUDIO_CODING_TYPE_LPCM)
 371                 snd_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2) - 8);
 372         else if (a->max_bitrate)
 373                 snprintf(buf2, sizeof(buf2),
 374                                 ", max bitrate = %d", a->max_bitrate);
 375         else
 376                 buf2[0] = '\0';
 377
 378         printk(KERN_INFO "HDMI: supports coding type %s:"
 379                         " channels = %d, rates =%s%s\n",
 380                         cea_audio_coding_type_names[a->format],
 381                         a->channels,
 382                         buf,
 383                         buf2);
 384 }
 385
 386 void snd_print_channel_allocation(int spk_alloc, char *buf, int buflen)
 387 {
 388         int i, j;
 389
 390         for (i = 0, j = 0; i < ARRAY_SIZE(cea_speaker_allocation_names); i++) {
 391                 if (spk_alloc & (1 << i))
 392                         j += snprintf(buf + j, buflen - j,  " %s",
 393                                         cea_speaker_allocation_names[i]);
 394         }
 395         buf[j] = '\0';  /* necessary when j == 0 */
 396 }
 397
 398 void snd_hdmi_show_eld(struct hdmi_eld *e)
 399 {
 400         int i;
 401
 402         printk(KERN_INFO "HDMI: detected monitor %s at connection type %s\n",
 403                         e->monitor_name,
 404                         eld_connection_type_names[e->conn_type]);
 405
 406         if (e->spk_alloc) {
 407                 char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
 408                 snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
 409                 printk(KERN_INFO "HDMI: available speakers:%s\n", buf);
 410         }
 411
 412         for (i = 0; i < e->sad_count; i++)
 413                 hdmi_show_short_audio_desc(e->sad + i);
 414 }
 415
 416 #ifdef CONFIG_PROC_FS
 417
 418 static void hdmi_print_sad_info(int i, struct cea_sad *a,
 419                                 struct snd_info_buffer *buffer)
 420 {
 421         char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
 422
 423         snd_iprintf(buffer, "sad%d_coding_type\t[0x%x] %s\n",
 424                         i, a->format, cea_audio_coding_type_names[a->format]);
 425         snd_iprintf(buffer, "sad%d_channels\t\t%d\n", i, a->channels);
 426
 427         snd_print_pcm_rates(a->rates, buf, sizeof(buf));
 428         snd_iprintf(buffer, "sad%d_rates\t\t[0x%x]%s\n", i, a->rates, buf);
 429
 430         if (a->format == AUDIO_CODING_TYPE_LPCM) {
 431                 snd_print_pcm_bits(a->sample_bits, buf, sizeof(buf));
 432                 snd_iprintf(buffer, "sad%d_bits\t\t[0x%x]%s\n",
 433                                                         i, a->sample_bits, buf);
 434         }
 435
 436         if (a->max_bitrate)
 437                 snd_iprintf(buffer, "sad%d_max_bitrate\t%d\n",
 438                                                         i, a->max_bitrate);
 439
 440         if (a->profile)
 441                 snd_iprintf(buffer, "sad%d_profile\t\t%d\n", i, a->profile);
 442 }
 443
 444 static void hdmi_print_eld_info(struct snd_info_entry *entry,
 445                                 struct snd_info_buffer *buffer)
 446 {
 447         struct hdmi_eld *e = entry->private_data;
 448         char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
 449         int i;
 450         static char *eld_versoin_names[32] = {
 451                 "reserved",
 452                 "reserved",
 453                 "CEA-861D or below",
 454                 [3 ... 30] = "reserved",
 455                 [31] = "partial"
 456         };
 457         static char *cea_edid_version_names[8] = {
 458                 "no CEA EDID Timing Extension block present",
 459                 "CEA-861",
 460                 "CEA-861-A",
 461                 "CEA-861-B, C or D",
 462                 [4 ... 7] = "reserved"
 463         };
 464
 465         snd_iprintf(buffer, "monitor_present\t\t%d\n", e->monitor_present);
 466         snd_iprintf(buffer, "eld_valid\t\t%d\n", e->eld_valid);
 467         if (!e->eld_valid)
 468                 return;
 469         snd_iprintf(buffer, "monitor_name\t\t%s\n", e->monitor_name);
 470         snd_iprintf(buffer, "connection_type\t\t%s\n",
 471                                 eld_connection_type_names[e->conn_type]);
 472         snd_iprintf(buffer, "eld_version\t\t[0x%x] %s\n", e->eld_ver,
 473                                         eld_versoin_names[e->eld_ver]);
 474         snd_iprintf(buffer, "edid_version\t\t[0x%x] %s\n", e->cea_edid_ver,
 475                                 cea_edid_version_names[e->cea_edid_ver]);
 476         snd_iprintf(buffer, "manufacture_id\t\t0x%x\n", e->manufacture_id);
 477         snd_iprintf(buffer, "product_id\t\t0x%x\n", e->product_id);
 478         snd_iprintf(buffer, "port_id\t\t\t0x%llx\n", (long long)e->port_id);
 479         snd_iprintf(buffer, "support_hdcp\t\t%d\n", e->support_hdcp);
 480         snd_iprintf(buffer, "support_ai\t\t%d\n", e->support_ai);
 481         snd_iprintf(buffer, "audio_sync_delay\t%d\n", e->aud_synch_delay);
 482
 483         snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
 484         snd_iprintf(buffer, "speakers\t\t[0x%x]%s\n", e->spk_alloc, buf);
 485
 486         snd_iprintf(buffer, "sad_count\t\t%d\n", e->sad_count);
 487
 488         for (i = 0; i < e->sad_count; i++)
 489                 hdmi_print_sad_info(i, e->sad + i, buffer);
 490 }
 491
 492 static void hdmi_write_eld_info(struct snd_info_entry *entry,
 493                                 struct snd_info_buffer *buffer)
 494 {
 495         struct hdmi_eld *e = entry->private_data;
 496         char line[64];
 497         char name[64];
 498         char *sname;
 499         long long val;
 500         unsigned int n;
 501
 502         while (!snd_info_get_line(buffer, line, sizeof(line))) {
 503                 if (sscanf(line, "%s %llx", name, &val) != 2)
 504                         continue;
 505                 /*
 506                  * We don't allow modification to these fields:
 507                  *      monitor_name manufacture_id product_id
 508                  *      eld_version edid_version
 509                  */
 510                 if (!strcmp(name, "monitor_present"))
 511                         e->monitor_present = val;
 512                 else if (!strcmp(name, "eld_valid"))
 513                         e->eld_valid = val;
 514                 else if (!strcmp(name, "connection_type"))
 515                         e->conn_type = val;
 516                 else if (!strcmp(name, "port_id"))
 517                         e->port_id = val;
 518                 else if (!strcmp(name, "support_hdcp"))
 519                         e->support_hdcp = val;
 520                 else if (!strcmp(name, "support_ai"))
 521                         e->support_ai = val;
 522                 else if (!strcmp(name, "audio_sync_delay"))
 523                         e->aud_synch_delay = val;
 524                 else if (!strcmp(name, "speakers"))
 525                         e->spk_alloc = val;
 526                 else if (!strcmp(name, "sad_count"))
 527                         e->sad_count = val;
 528                 else if (!strncmp(name, "sad", 3)) {
 529                         sname = name + 4;
 530                         n = name[3] - '0';
 531                         if (name[4] >= '0' && name[4] <= '9') {
 532                                 sname++;
 533                                 n = 10 * n + name[4] - '0';
 534                         }
 535                         if (n >= ELD_MAX_SAD)
 536                                 continue;
 537                         if (!strcmp(sname, "_coding_type"))
 538                                 e->sad[n].format = val;
 539                         else if (!strcmp(sname, "_channels"))
 540                                 e->sad[n].channels = val;
 541                         else if (!strcmp(sname, "_rates"))
 542                                 e->sad[n].rates = val;
 543                         else if (!strcmp(sname, "_bits"))
 544                                 e->sad[n].sample_bits = val;
 545                         else if (!strcmp(sname, "_max_bitrate"))
 546                                 e->sad[n].max_bitrate = val;
 547                         else if (!strcmp(sname, "_profile"))
 548                                 e->sad[n].profile = val;
 549                         if (n >= e->sad_count)
 550                                 e->sad_count = n + 1;
 551                 }
 552         }
 553 }
 554
 555
 556 int snd_hda_eld_proc_new(struct hda_codec *codec, struct hdmi_eld *eld,
 557                          int index)
 558 {
 559         char name[32];
 560         struct snd_info_entry *entry;
 561         int err;
 562
 563         snprintf(name, sizeof(name), "eld#%d.%d", codec->addr, index);
 564         err = snd_card_proc_new(codec->bus->card, name, &entry);
 565         if (err < 0)
 566                 return err;
 567
 568         snd_info_set_text_ops(entry, eld, hdmi_print_eld_info);
 569         entry->c.text.write = hdmi_write_eld_info;
 570         entry->mode |= S_IWUSR;
 571         eld->proc_entry = entry;
 572
 573         return 0;
 574 }
 575
 576 void snd_hda_eld_proc_free(struct hda_codec *codec, struct hdmi_eld *eld)
 577 {
 578         if (!codec->bus->shutdown && eld->proc_entry) {
 579                 snd_device_free(codec->bus->card, eld->proc_entry);
 580                 eld->proc_entry = NULL;
 581         }
 582 }
 583
 584 #endif /* CONFIG_PROC_FS */
 585
 586 /* update PCM info based on ELD */
 587 void snd_hdmi_eld_update_pcm_info(struct hdmi_eld *eld,
 588                               struct hda_pcm_stream *hinfo)
 589 {
 590         u32 rates;
 591         u64 formats;
 592         unsigned int maxbps;
 593         unsigned int channels_max;
 594         int i;
 595
 596         /* assume basic audio support (the basic audio flag is not in ELD;
 597          * however, all audio capable sinks are required to support basic
 598          * audio) */
 599         rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
 600                 SNDRV_PCM_RATE_48000;
 601         formats = SNDRV_PCM_FMTBIT_S16_LE;
 602         maxbps = 16;
 603         channels_max = 2;
 604         for (i = 0; i < eld->sad_count; i++) {
 605                 struct cea_sad *a = &eld->sad[i];
 606                 rates |= a->rates;
 607                 if (a->channels > channels_max)
 608                         channels_max = a->channels;
 609                 if (a->format == AUDIO_CODING_TYPE_LPCM) {
 610                         if (a->sample_bits & AC_SUPPCM_BITS_20) {
 611                                 formats |= SNDRV_PCM_FMTBIT_S32_LE;
 612                                 if (maxbps < 20)
 613                                         maxbps = 20;
 614                         }
 615                         if (a->sample_bits & AC_SUPPCM_BITS_24) {
 616                                 formats |= SNDRV_PCM_FMTBIT_S32_LE;
 617                                 if (maxbps < 24)
 618                                         maxbps = 24;
 619                         }
 620                 }
 621         }
 622
 623         /* restrict the parameters by the values the codec provides */
 624         hinfo->rates &= rates;
 625         hinfo->formats &= formats;
 626         hinfo->maxbps = min(hinfo->maxbps, maxbps);
 627         hinfo->channels_max = min(hinfo->channels_max, channels_max);
 628 }