git.oblomov.eu Git - linux-2.6/blob - 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 <sound/core.h>
  26 #include <asm/unaligned.h>
  27 #include "hda_codec.h"
  28 #include "hda_local.h"
  29
  30 enum eld_versions {
  31         ELD_VER_CEA_861D        = 2,
  32         ELD_VER_PARTIAL         = 31,
  33 };
  34
  35 static char *eld_versoin_names[32] = {
  36         "reserved",
  37         "reserved",
  38         "CEA-861D or below",
  39         [3 ... 30] = "reserved",
  40         [31] = "partial"
  41 };
  42
  43 enum cea_edid_versions {
  44         CEA_EDID_VER_NONE       = 0,
  45         CEA_EDID_VER_CEA861     = 1,
  46         CEA_EDID_VER_CEA861A    = 2,
  47         CEA_EDID_VER_CEA861BCD  = 3,
  48         CEA_EDID_VER_RESERVED   = 4,
  49 };
  50
  51 static char *cea_edid_version_names[8] = {
  52         "no CEA EDID Timing Extension block present",
  53         "CEA-861",
  54         "CEA-861-A",
  55         "CEA-861-B, C or D",
  56         [4 ... 7] = "reserved"
  57 };
  58
  59 static char *cea_speaker_allocation_names[] = {
  60         /*  0 */ "FL/FR",
  61         /*  1 */ "LFE",
  62         /*  2 */ "FC",
  63         /*  3 */ "RL/RR",
  64         /*  4 */ "RC",
  65         /*  5 */ "FLC/FRC",
  66         /*  6 */ "RLC/RRC",
  67         /*  7 */ "FLW/FRW",
  68         /*  8 */ "FLH/FRH",
  69         /*  9 */ "TC",
  70         /* 10 */ "FCH",
  71 };
  72
  73 static char *eld_connection_type_names[4] = {
  74         "HDMI",
  75         "Display Port",
  76         "2-reserved",
  77         "3-reserved"
  78 };
  79
  80 enum cea_audio_coding_types {
  81         AUDIO_CODING_TYPE_REF_STREAM_HEADER     =  0,
  82         AUDIO_CODING_TYPE_LPCM                  =  1,
  83         AUDIO_CODING_TYPE_AC3                   =  2,
  84         AUDIO_CODING_TYPE_MPEG1                 =  3,
  85         AUDIO_CODING_TYPE_MP3                   =  4,
  86         AUDIO_CODING_TYPE_MPEG2                 =  5,
  87         AUDIO_CODING_TYPE_AACLC                 =  6,
  88         AUDIO_CODING_TYPE_DTS                   =  7,
  89         AUDIO_CODING_TYPE_ATRAC                 =  8,
  90         AUDIO_CODING_TYPE_SACD                  =  9,
  91         AUDIO_CODING_TYPE_EAC3                  = 10,
  92         AUDIO_CODING_TYPE_DTS_HD                = 11,
  93         AUDIO_CODING_TYPE_MLP                   = 12,
  94         AUDIO_CODING_TYPE_DST                   = 13,
  95         AUDIO_CODING_TYPE_WMAPRO                = 14,
  96         AUDIO_CODING_TYPE_REF_CXT               = 15,
  97         /* also include valid xtypes below */
  98         AUDIO_CODING_TYPE_HE_AAC                = 15,
  99         AUDIO_CODING_TYPE_HE_AAC2               = 16,
 100         AUDIO_CODING_TYPE_MPEG_SURROUND         = 17,
 101 };
 102
 103 enum cea_audio_coding_xtypes {
 104         AUDIO_CODING_XTYPE_HE_REF_CT            = 0,
 105         AUDIO_CODING_XTYPE_HE_AAC               = 1,
 106         AUDIO_CODING_XTYPE_HE_AAC2              = 2,
 107         AUDIO_CODING_XTYPE_MPEG_SURROUND        = 3,
 108         AUDIO_CODING_XTYPE_FIRST_RESERVED       = 4,
 109 };
 110
 111 static char *cea_audio_coding_type_names[] = {
 112         /*  0 */ "undefined",
 113         /*  1 */ "LPCM",
 114         /*  2 */ "AC-3",
 115         /*  3 */ "MPEG1",
 116         /*  4 */ "MP3",
 117         /*  5 */ "MPEG2",
 118         /*  6 */ "AAC-LC",
 119         /*  7 */ "DTS",
 120         /*  8 */ "ATRAC",
 121         /*  9 */ "DSD (One Bit Audio)",
 122         /* 10 */ "E-AC-3/DD+ (Dolby Digital Plus)",
 123         /* 11 */ "DTS-HD",
 124         /* 12 */ "MLP (Dolby TrueHD)",
 125         /* 13 */ "DST",
 126         /* 14 */ "WMAPro",
 127         /* 15 */ "HE-AAC",
 128         /* 16 */ "HE-AACv2",
 129         /* 17 */ "MPEG Surround",
 130 };
 131
 132 /*
 133  * The following two lists are shared between
 134  *      - HDMI audio InfoFrame (source to sink)
 135  *      - CEA E-EDID Extension (sink to source)
 136  */
 137
 138 /*
 139  * SS1:SS0 index => sample size
 140  */
 141 static int cea_sample_sizes[4] = {
 142         0,                      /* 0: Refer to Stream Header */
 143         AC_SUPPCM_BITS_16,      /* 1: 16 bits */
 144         AC_SUPPCM_BITS_20,      /* 2: 20 bits */
 145         AC_SUPPCM_BITS_24,      /* 3: 24 bits */
 146 };
 147
 148 /*
 149  * SF2:SF1:SF0 index => sampling frequency
 150  */
 151 static int cea_sampling_frequencies[8] = {
 152         0,                      /* 0: Refer to Stream Header */
 153         SNDRV_PCM_RATE_32000,   /* 1:  32000Hz */
 154         SNDRV_PCM_RATE_44100,   /* 2:  44100Hz */
 155         SNDRV_PCM_RATE_48000,   /* 3:  48000Hz */
 156         SNDRV_PCM_RATE_88200,   /* 4:  88200Hz */
 157         SNDRV_PCM_RATE_96000,   /* 5:  96000Hz */
 158         SNDRV_PCM_RATE_176400,  /* 6: 176400Hz */
 159         SNDRV_PCM_RATE_192000,  /* 7: 192000Hz */
 160 };
 161
 162 static unsigned char hdmi_get_eld_byte(struct hda_codec *codec, hda_nid_t nid,
 163                                         int byte_index)
 164 {
 165         unsigned int val;
 166
 167         val = snd_hda_codec_read(codec, nid, 0,
 168                                         AC_VERB_GET_HDMI_ELDD, byte_index);
 169
 170 #ifdef BE_PARANOID
 171         printk(KERN_INFO "HDMI: ELD data byte %d: 0x%x\n", byte_index, val);
 172 #endif
 173
 174         if ((val & AC_ELDD_ELD_VALID) == 0) {
 175                 snd_printd(KERN_INFO "HDMI: invalid ELD data byte %d\n",
 176                                                                 byte_index);
 177                 val = 0;
 178         }
 179
 180         return val & AC_ELDD_ELD_DATA;
 181 }
 182
 183 #define GRAB_BITS(buf, byte, lowbit, bits)              \
 184 ({                                                      \
 185         BUILD_BUG_ON(lowbit > 7);                       \
 186         BUILD_BUG_ON(bits > 8);                         \
 187         BUILD_BUG_ON(bits <= 0);                        \
 188                                                         \
 189         (buf[byte] >> (lowbit)) & ((1 << (bits)) - 1);  \
 190 })
 191
 192 static void hdmi_update_short_audio_desc(struct cea_sad *a,
 193                                          const unsigned char *buf)
 194 {
 195         int i;
 196         int val;
 197
 198         val = GRAB_BITS(buf, 1, 0, 7);
 199         a->rates = 0;
 200         for (i = 0; i < 7; i++)
 201                 if (val & (1 << i))
 202                         a->rates |= cea_sampling_frequencies[i + 1];
 203
 204         a->channels = GRAB_BITS(buf, 0, 0, 3);
 205         a->channels++;
 206
 207         a->format = GRAB_BITS(buf, 0, 3, 4);
 208         switch (a->format) {
 209         case AUDIO_CODING_TYPE_REF_STREAM_HEADER:
 210                 snd_printd(KERN_INFO
 211                                 "HDMI: audio coding type 0 not expected\n");
 212                 break;
 213
 214         case AUDIO_CODING_TYPE_LPCM:
 215                 val = GRAB_BITS(buf, 2, 0, 3);
 216                 a->sample_bits = 0;
 217                 for (i = 0; i < 3; i++)
 218                         if (val & (1 << i))
 219                                 a->sample_bits |= cea_sample_sizes[i + 1];
 220                 break;
 221
 222         case AUDIO_CODING_TYPE_AC3:
 223         case AUDIO_CODING_TYPE_MPEG1:
 224         case AUDIO_CODING_TYPE_MP3:
 225         case AUDIO_CODING_TYPE_MPEG2:
 226         case AUDIO_CODING_TYPE_AACLC:
 227         case AUDIO_CODING_TYPE_DTS:
 228         case AUDIO_CODING_TYPE_ATRAC:
 229                 a->max_bitrate = GRAB_BITS(buf, 2, 0, 8);
 230                 a->max_bitrate *= 8000;
 231                 break;
 232
 233         case AUDIO_CODING_TYPE_SACD:
 234                 break;
 235
 236         case AUDIO_CODING_TYPE_EAC3:
 237                 break;
 238
 239         case AUDIO_CODING_TYPE_DTS_HD:
 240                 break;
 241
 242         case AUDIO_CODING_TYPE_MLP:
 243                 break;
 244
 245         case AUDIO_CODING_TYPE_DST:
 246                 break;
 247
 248         case AUDIO_CODING_TYPE_WMAPRO:
 249                 a->profile = GRAB_BITS(buf, 2, 0, 3);
 250                 break;
 251
 252         case AUDIO_CODING_TYPE_REF_CXT:
 253                 a->format = GRAB_BITS(buf, 2, 3, 5);
 254                 if (a->format == AUDIO_CODING_XTYPE_HE_REF_CT ||
 255                     a->format >= AUDIO_CODING_XTYPE_FIRST_RESERVED) {
 256                         snd_printd(KERN_INFO
 257                                 "HDMI: audio coding xtype %d not expected\n",
 258                                 a->format);
 259                         a->format = 0;
 260                 } else
 261                         a->format += AUDIO_CODING_TYPE_HE_AAC -
 262                                      AUDIO_CODING_XTYPE_HE_AAC;
 263                 break;
 264         }
 265 }
 266
 267 /*
 268  * Be careful, ELD buf could be totally rubbish!
 269  */
 270 static int hdmi_update_eld(struct hdmi_eld *e,
 271                            const unsigned char *buf, int size)
 272 {
 273         int mnl;
 274         int i;
 275
 276         e->eld_ver = GRAB_BITS(buf, 0, 3, 5);
 277         if (e->eld_ver != ELD_VER_CEA_861D &&
 278             e->eld_ver != ELD_VER_PARTIAL) {
 279                 snd_printd(KERN_INFO "HDMI: Unknown ELD version %d\n",
 280                                                                 e->eld_ver);
 281                 goto out_fail;
 282         }
 283
 284         e->eld_size = size;
 285         e->baseline_len = GRAB_BITS(buf, 2, 0, 8);
 286         mnl             = GRAB_BITS(buf, 4, 0, 5);
 287         e->cea_edid_ver = GRAB_BITS(buf, 4, 5, 3);
 288
 289         e->support_hdcp = GRAB_BITS(buf, 5, 0, 1);
 290         e->support_ai   = GRAB_BITS(buf, 5, 1, 1);
 291         e->conn_type    = GRAB_BITS(buf, 5, 2, 2);
 292         e->sad_count    = GRAB_BITS(buf, 5, 4, 4);
 293
 294         e->aud_synch_delay = GRAB_BITS(buf, 6, 0, 8) * 2;
 295         e->spk_alloc    = GRAB_BITS(buf, 7, 0, 7);
 296
 297         e->port_id        = get_unaligned_le64(buf + 8);
 298
 299         /* not specified, but the spec's tendency is little endian */
 300         e->manufacture_id = get_unaligned_le16(buf + 16);
 301         e->product_id     = get_unaligned_le16(buf + 18);
 302
 303         if (mnl > ELD_MAX_MNL) {
 304                 snd_printd(KERN_INFO "HDMI: MNL is reserved value %d\n", mnl);
 305                 goto out_fail;
 306         } else if (ELD_FIXED_BYTES + mnl > size) {
 307                 snd_printd(KERN_INFO "HDMI: out of range MNL %d\n", mnl);
 308                 goto out_fail;
 309         } else
 310                 strlcpy(e->monitor_name, buf + ELD_FIXED_BYTES, mnl);
 311
 312         for (i = 0; i < e->sad_count; i++) {
 313                 if (ELD_FIXED_BYTES + mnl + 3 * (i + 1) > size) {
 314                         snd_printd(KERN_INFO "HDMI: out of range SAD %d\n", i);
 315                         goto out_fail;
 316                 }
 317                 hdmi_update_short_audio_desc(e->sad + i,
 318                                         buf + ELD_FIXED_BYTES + mnl + 3 * i);
 319         }
 320
 321         return 0;
 322
 323 out_fail:
 324         e->eld_ver = 0;
 325         return -EINVAL;
 326 }
 327
 328 static int hdmi_present_sense(struct hda_codec *codec, hda_nid_t nid)
 329 {
 330         return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_PIN_SENSE, 0);
 331 }
 332
 333 static int hdmi_eld_valid(struct hda_codec *codec, hda_nid_t nid)
 334 {
 335         int eldv;
 336         int present;
 337
 338         present = hdmi_present_sense(codec, nid);
 339         eldv    = (present & AC_PINSENSE_ELDV);
 340         present = (present & AC_PINSENSE_PRESENCE);
 341
 342 #ifdef CONFIG_SND_DEBUG_VERBOSE
 343         printk(KERN_INFO "HDMI: sink_present = %d, eld_valid = %d\n",
 344                         !!present, !!eldv);
 345 #endif
 346
 347         return eldv && present;
 348 }
 349
 350 int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid)
 351 {
 352         return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_SIZE,
 353                                                  AC_DIPSIZE_ELD_BUF);
 354 }
 355
 356 int snd_hdmi_get_eld(struct hdmi_eld *eld,
 357                      struct hda_codec *codec, hda_nid_t nid)
 358 {
 359         int i;
 360         int ret;
 361         int size;
 362         unsigned char *buf;
 363
 364         if (!hdmi_eld_valid(codec, nid))
 365                 return -ENOENT;
 366
 367         size = snd_hdmi_get_eld_size(codec, nid);
 368         if (size == 0) {
 369                 /* wfg: workaround for ASUS P5E-VM HDMI board */
 370                 snd_printd(KERN_INFO "HDMI: ELD buf size is 0, force 128\n");
 371                 size = 128;
 372         }
 373         if (size < ELD_FIXED_BYTES || size > PAGE_SIZE) {
 374                 snd_printd(KERN_INFO "HDMI: invalid ELD buf size %d\n", size);
 375                 return -ERANGE;
 376         }
 377
 378         buf = kmalloc(size, GFP_KERNEL);
 379         if (!buf)
 380                 return -ENOMEM;
 381
 382         for (i = 0; i < size; i++)
 383                 buf[i] = hdmi_get_eld_byte(codec, nid, i);
 384
 385         ret = hdmi_update_eld(eld, buf, size);
 386
 387         kfree(buf);
 388         return ret;
 389 }
 390
 391 static void hdmi_show_short_audio_desc(struct cea_sad *a)
 392 {
 393         char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
 394         char buf2[8 + SND_PRINT_BITS_ADVISED_BUFSIZE] = ", bits =";
 395
 396         if (!a->format)
 397                 return;
 398
 399         snd_print_pcm_rates(a->rates, buf, sizeof(buf));
 400
 401         if (a->format == AUDIO_CODING_TYPE_LPCM)
 402                 snd_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2 - 8));
 403         else if (a->max_bitrate)
 404                 snprintf(buf2, sizeof(buf2),
 405                                 ", max bitrate = %d", a->max_bitrate);
 406         else
 407                 buf2[0] = '\0';
 408
 409         printk(KERN_INFO "HDMI: supports coding type %s:"
 410                         " channels = %d, rates =%s%s\n",
 411                         cea_audio_coding_type_names[a->format],
 412                         a->channels,
 413                         buf,
 414                         buf2);
 415 }
 416
 417 void snd_print_channel_allocation(int spk_alloc, char *buf, int buflen)
 418 {
 419         int i, j;
 420
 421         for (i = 0, j = 0; i < ARRAY_SIZE(cea_speaker_allocation_names); i++) {
 422                 if (spk_alloc & (1 << i))
 423                         j += snprintf(buf + j, buflen - j,  " %s",
 424                                         cea_speaker_allocation_names[i]);
 425         }
 426         buf[j] = '\0';  /* necessary when j == 0 */
 427 }
 428
 429 void snd_hdmi_show_eld(struct hdmi_eld *e)
 430 {
 431         int i;
 432
 433         printk(KERN_INFO "HDMI: detected monitor %s at connection type %s\n",
 434                         e->monitor_name,
 435                         eld_connection_type_names[e->conn_type]);
 436
 437         if (e->spk_alloc) {
 438                 char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
 439                 snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
 440                 printk(KERN_INFO "HDMI: available speakers:%s\n", buf);
 441         }
 442
 443         for (i = 0; i < e->sad_count; i++)
 444                 hdmi_show_short_audio_desc(e->sad + i);
 445 }
 446
 447 #ifdef CONFIG_PROC_FS
 448
 449 static void hdmi_print_sad_info(int i, struct cea_sad *a,
 450                                 struct snd_info_buffer *buffer)
 451 {
 452         char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
 453
 454         snd_iprintf(buffer, "sad%d_coding_type\t[0x%x] %s\n",
 455                         i, a->format, cea_audio_coding_type_names[a->format]);
 456         snd_iprintf(buffer, "sad%d_channels\t\t%d\n", i, a->channels);
 457
 458         snd_print_pcm_rates(a->rates, buf, sizeof(buf));
 459         snd_iprintf(buffer, "sad%d_rates\t\t[0x%x]%s\n", i, a->rates, buf);
 460
 461         if (a->format == AUDIO_CODING_TYPE_LPCM) {
 462                 snd_print_pcm_bits(a->sample_bits, buf, sizeof(buf));
 463                 snd_iprintf(buffer, "sad%d_bits\t\t[0x%x]%s\n",
 464                                                         i, a->sample_bits, buf);
 465         }
 466
 467         if (a->max_bitrate)
 468                 snd_iprintf(buffer, "sad%d_max_bitrate\t%d\n",
 469                                                         i, a->max_bitrate);
 470
 471         if (a->profile)
 472                 snd_iprintf(buffer, "sad%d_profile\t\t%d\n", i, a->profile);
 473 }
 474
 475 static void hdmi_print_eld_info(struct snd_info_entry *entry,
 476                                 struct snd_info_buffer *buffer)
 477 {
 478         struct hdmi_eld *e = entry->private_data;
 479         char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
 480         int i;
 481
 482         snd_iprintf(buffer, "monitor_name\t\t%s\n", e->monitor_name);
 483         snd_iprintf(buffer, "connection_type\t\t%s\n",
 484                                 eld_connection_type_names[e->conn_type]);
 485         snd_iprintf(buffer, "eld_version\t\t[0x%x] %s\n", e->eld_ver,
 486                                         eld_versoin_names[e->eld_ver]);
 487         snd_iprintf(buffer, "edid_version\t\t[0x%x] %s\n", e->cea_edid_ver,
 488                                 cea_edid_version_names[e->cea_edid_ver]);
 489         snd_iprintf(buffer, "manufacture_id\t\t0x%x\n", e->manufacture_id);
 490         snd_iprintf(buffer, "product_id\t\t0x%x\n", e->product_id);
 491         snd_iprintf(buffer, "port_id\t\t\t0x%llx\n", (long long)e->port_id);
 492         snd_iprintf(buffer, "support_hdcp\t\t%d\n", e->support_hdcp);
 493         snd_iprintf(buffer, "support_ai\t\t%d\n", e->support_ai);
 494         snd_iprintf(buffer, "audio_sync_delay\t%d\n", e->aud_synch_delay);
 495
 496         snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
 497         snd_iprintf(buffer, "speakers\t\t[0x%x]%s\n", e->spk_alloc, buf);
 498
 499         snd_iprintf(buffer, "sad_count\t\t%d\n", e->sad_count);
 500
 501         for (i = 0; i < e->sad_count; i++)
 502                 hdmi_print_sad_info(i, e->sad + i, buffer);
 503 }
 504
 505 static void hdmi_write_eld_item(struct snd_info_entry *entry,
 506                                 struct snd_info_buffer *buffer)
 507 {
 508         struct hdmi_eld *e = entry->private_data;
 509         char line[64];
 510         char name[64];
 511         char *sname;
 512         long long val;
 513         int n;
 514
 515         while (!snd_info_get_line(buffer, line, sizeof(line))) {
 516                 if (sscanf(line, "%s %llx", name, &val) != 2)
 517                         continue;
 518                 if (!strcmp(name, "connection_type"))
 519                         e->conn_type = val;
 520                 else if (!strcmp(name, "port_id"))
 521                         e->port_id = val;
 522                 else if (!strcmp(name, "support_hdcp"))
 523                         e->support_hdcp = val;
 524                 else if (!strcmp(name, "support_ai"))
 525                         e->support_ai = val;
 526                 else if (!strcmp(name, "audio_sync_delay"))
 527                         e->aud_synch_delay = val;
 528                 else if (!strcmp(name, "speakers"))
 529                         e->spk_alloc = val;
 530                 else if (!strcmp(name, "sad_count"))
 531                         e->sad_count = val;
 532                 else if (!strncmp(name, "sad", 3)) {
 533                         sname = name + 4;
 534                         n = name[3] - '0';
 535                         if (name[4] >= '0' && name[4] <= '9') {
 536                                 sname++;
 537                                 n = 10 * n + name[4] - '0';
 538                         }
 539                         if (n < 0 || n > 31) /* double the CEA limit */
 540                                 continue;
 541                         if (!strcmp(sname, "_coding_type"))
 542                                 e->sad[n].format = val;
 543                         else if (!strcmp(sname, "_channels"))
 544                                 e->sad[n].channels = val;
 545                         else if (!strcmp(sname, "_rates"))
 546                                 e->sad[n].rates = val;
 547                         else if (!strcmp(sname, "_bits"))
 548                                 e->sad[n].sample_bits = val;
 549                         else if (!strcmp(sname, "_max_bitrate"))
 550                                 e->sad[n].max_bitrate = val;
 551                         if (n >= e->sad_count)
 552                                 e->sad_count = n + 1;
 553                 }
 554         }
 555 }
 556
 557
 558 int snd_hda_eld_proc_new(struct hda_codec *codec, struct hdmi_eld *eld)
 559 {
 560         char name[32];
 561         struct snd_info_entry *entry;
 562         int err;
 563
 564         snprintf(name, sizeof(name), "eld#%d", codec->addr);
 565         err = snd_card_proc_new(codec->bus->card, name, &entry);
 566         if (err < 0)
 567                 return err;
 568
 569         snd_info_set_text_ops(entry, eld, hdmi_print_eld_info);
 570         entry->c.text.write = hdmi_write_eld_item;
 571         entry->mode |= S_IWUSR;
 572         eld->proc_entry = entry;
 573
 574         return 0;
 575 }
 576
 577 void snd_hda_eld_proc_free(struct hda_codec *codec, struct hdmi_eld *eld)
 578 {
 579         if (!codec->bus->shutdown && eld->proc_entry) {
 580                 snd_device_free(codec->bus->card, eld->proc_entry);
 581                 eld->proc_entry = NULL;
 582         }
 583 }
 584
 585 #endif /* CONFIG_PROC_FS */