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 enum cea_edid_versions {
  36         CEA_EDID_VER_NONE       = 0,
  37         CEA_EDID_VER_CEA861     = 1,
  38         CEA_EDID_VER_CEA861A    = 2,
  39         CEA_EDID_VER_CEA861BCD  = 3,
  40         CEA_EDID_VER_RESERVED   = 4,
  41 };
  42
  43 static char *cea_speaker_allocation_names[] = {
  44         /*  0 */ "FL/FR",
  45         /*  1 */ "LFE",
  46         /*  2 */ "FC",
  47         /*  3 */ "RL/RR",
  48         /*  4 */ "RC",
  49         /*  5 */ "FLC/FRC",
  50         /*  6 */ "RLC/RRC",
  51         /*  7 */ "FLW/FRW",
  52         /*  8 */ "FLH/FRH",
  53         /*  9 */ "TC",
  54         /* 10 */ "FCH",
  55 };
  56
  57 static char *eld_connection_type_names[4] = {
  58         "HDMI",
  59         "DisplayPort",
  60         "2-reserved",
  61         "3-reserved"
  62 };
  63
  64 enum cea_audio_coding_types {
  65         AUDIO_CODING_TYPE_REF_STREAM_HEADER     =  0,
  66         AUDIO_CODING_TYPE_LPCM                  =  1,
  67         AUDIO_CODING_TYPE_AC3                   =  2,
  68         AUDIO_CODING_TYPE_MPEG1                 =  3,
  69         AUDIO_CODING_TYPE_MP3                   =  4,
  70         AUDIO_CODING_TYPE_MPEG2                 =  5,
  71         AUDIO_CODING_TYPE_AACLC                 =  6,
  72         AUDIO_CODING_TYPE_DTS                   =  7,
  73         AUDIO_CODING_TYPE_ATRAC                 =  8,
  74         AUDIO_CODING_TYPE_SACD                  =  9,
  75         AUDIO_CODING_TYPE_EAC3                  = 10,
  76         AUDIO_CODING_TYPE_DTS_HD                = 11,
  77         AUDIO_CODING_TYPE_MLP                   = 12,
  78         AUDIO_CODING_TYPE_DST                   = 13,
  79         AUDIO_CODING_TYPE_WMAPRO                = 14,
  80         AUDIO_CODING_TYPE_REF_CXT               = 15,
  81         /* also include valid xtypes below */
  82         AUDIO_CODING_TYPE_HE_AAC                = 15,
  83         AUDIO_CODING_TYPE_HE_AAC2               = 16,
  84         AUDIO_CODING_TYPE_MPEG_SURROUND         = 17,
  85 };
  86
  87 enum cea_audio_coding_xtypes {
  88         AUDIO_CODING_XTYPE_HE_REF_CT            = 0,
  89         AUDIO_CODING_XTYPE_HE_AAC               = 1,
  90         AUDIO_CODING_XTYPE_HE_AAC2              = 2,
  91         AUDIO_CODING_XTYPE_MPEG_SURROUND        = 3,
  92         AUDIO_CODING_XTYPE_FIRST_RESERVED       = 4,
  93 };
  94
  95 static char *cea_audio_coding_type_names[] = {
  96         /*  0 */ "undefined",
  97         /*  1 */ "LPCM",
  98         /*  2 */ "AC-3",
  99         /*  3 */ "MPEG1",
 100         /*  4 */ "MP3",
 101         /*  5 */ "MPEG2",
 102         /*  6 */ "AAC-LC",
 103         /*  7 */ "DTS",
 104         /*  8 */ "ATRAC",
 105         /*  9 */ "DSD (One Bit Audio)",
 106         /* 10 */ "E-AC-3/DD+ (Dolby Digital Plus)",
 107         /* 11 */ "DTS-HD",
 108         /* 12 */ "MLP (Dolby TrueHD)",
 109         /* 13 */ "DST",
 110         /* 14 */ "WMAPro",
 111         /* 15 */ "HE-AAC",
 112         /* 16 */ "HE-AACv2",
 113         /* 17 */ "MPEG Surround",
 114 };
 115
 116 /*
 117  * The following two lists are shared between
 118  *      - HDMI audio InfoFrame (source to sink)
 119  *      - CEA E-EDID Extension (sink to source)
 120  */
 121
 122 /*
 123  * SS1:SS0 index => sample size
 124  */
 125 static int cea_sample_sizes[4] = {
 126         0,                      /* 0: Refer to Stream Header */
 127         AC_SUPPCM_BITS_16,      /* 1: 16 bits */
 128         AC_SUPPCM_BITS_20,      /* 2: 20 bits */
 129         AC_SUPPCM_BITS_24,      /* 3: 24 bits */
 130 };
 131
 132 /*
 133  * SF2:SF1:SF0 index => sampling frequency
 134  */
 135 static int cea_sampling_frequencies[8] = {
 136         0,                      /* 0: Refer to Stream Header */
 137         SNDRV_PCM_RATE_32000,   /* 1:  32000Hz */
 138         SNDRV_PCM_RATE_44100,   /* 2:  44100Hz */
 139         SNDRV_PCM_RATE_48000,   /* 3:  48000Hz */
 140         SNDRV_PCM_RATE_88200,   /* 4:  88200Hz */
 141         SNDRV_PCM_RATE_96000,   /* 5:  96000Hz */
 142         SNDRV_PCM_RATE_176400,  /* 6: 176400Hz */
 143         SNDRV_PCM_RATE_192000,  /* 7: 192000Hz */
 144 };
 145
 146 static unsigned char hdmi_get_eld_byte(struct hda_codec *codec, hda_nid_t nid,
 147                                         int byte_index)
 148 {
 149         unsigned int val;
 150
 151         val = snd_hda_codec_read(codec, nid, 0,
 152                                         AC_VERB_GET_HDMI_ELDD, byte_index);
 153
 154 #ifdef BE_PARANOID
 155         printk(KERN_INFO "HDMI: ELD data byte %d: 0x%x\n", byte_index, val);
 156 #endif
 157
 158         if ((val & AC_ELDD_ELD_VALID) == 0) {
 159                 snd_printd(KERN_INFO "HDMI: invalid ELD data byte %d\n",
 160                                                                 byte_index);
 161                 val = 0;
 162         }
 163
 164         return val & AC_ELDD_ELD_DATA;
 165 }
 166
 167 #define GRAB_BITS(buf, byte, lowbit, bits)              \
 168 ({                                                      \
 169         BUILD_BUG_ON(lowbit > 7);                       \
 170         BUILD_BUG_ON(bits > 8);                         \
 171         BUILD_BUG_ON(bits <= 0);                        \
 172                                                         \
 173         (buf[byte] >> (lowbit)) & ((1 << (bits)) - 1);  \
 174 })
 175
 176 static void hdmi_update_short_audio_desc(struct cea_sad *a,
 177                                          const unsigned char *buf)
 178 {
 179         int i;
 180         int val;
 181
 182         val = GRAB_BITS(buf, 1, 0, 7);
 183         a->rates = 0;
 184         for (i = 0; i < 7; i++)
 185                 if (val & (1 << i))
 186                         a->rates |= cea_sampling_frequencies[i + 1];
 187
 188         a->channels = GRAB_BITS(buf, 0, 0, 3);
 189         a->channels++;
 190
 191         a->format = GRAB_BITS(buf, 0, 3, 4);
 192         switch (a->format) {
 193         case AUDIO_CODING_TYPE_REF_STREAM_HEADER:
 194                 snd_printd(KERN_INFO
 195                                 "HDMI: audio coding type 0 not expected\n");
 196                 break;
 197
 198         case AUDIO_CODING_TYPE_LPCM:
 199                 val = GRAB_BITS(buf, 2, 0, 3);
 200                 a->sample_bits = 0;
 201                 for (i = 0; i < 3; i++)
 202                         if (val & (1 << i))
 203                                 a->sample_bits |= cea_sample_sizes[i + 1];
 204                 break;
 205
 206         case AUDIO_CODING_TYPE_AC3:
 207         case AUDIO_CODING_TYPE_MPEG1:
 208         case AUDIO_CODING_TYPE_MP3:
 209         case AUDIO_CODING_TYPE_MPEG2:
 210         case AUDIO_CODING_TYPE_AACLC:
 211         case AUDIO_CODING_TYPE_DTS:
 212         case AUDIO_CODING_TYPE_ATRAC:
 213                 a->max_bitrate = GRAB_BITS(buf, 2, 0, 8);
 214                 a->max_bitrate *= 8000;
 215                 break;
 216
 217         case AUDIO_CODING_TYPE_SACD:
 218                 break;
 219
 220         case AUDIO_CODING_TYPE_EAC3:
 221                 break;
 222
 223         case AUDIO_CODING_TYPE_DTS_HD:
 224                 break;
 225
 226         case AUDIO_CODING_TYPE_MLP:
 227                 break;
 228
 229         case AUDIO_CODING_TYPE_DST:
 230                 break;
 231
 232         case AUDIO_CODING_TYPE_WMAPRO:
 233                 a->profile = GRAB_BITS(buf, 2, 0, 3);
 234                 break;
 235
 236         case AUDIO_CODING_TYPE_REF_CXT:
 237                 a->format = GRAB_BITS(buf, 2, 3, 5);
 238                 if (a->format == AUDIO_CODING_XTYPE_HE_REF_CT ||
 239                     a->format >= AUDIO_CODING_XTYPE_FIRST_RESERVED) {
 240                         snd_printd(KERN_INFO
 241                                 "HDMI: audio coding xtype %d not expected\n",
 242                                 a->format);
 243                         a->format = 0;
 244                 } else
 245                         a->format += AUDIO_CODING_TYPE_HE_AAC -
 246                                      AUDIO_CODING_XTYPE_HE_AAC;
 247                 break;
 248         }
 249 }
 250
 251 /*
 252  * Be careful, ELD buf could be totally rubbish!
 253  */
 254 static int hdmi_update_eld(struct hdmi_eld *e,
 255                            const unsigned char *buf, int size)
 256 {
 257         int mnl;
 258         int i;
 259
 260         e->eld_ver = GRAB_BITS(buf, 0, 3, 5);
 261         if (e->eld_ver != ELD_VER_CEA_861D &&
 262             e->eld_ver != ELD_VER_PARTIAL) {
 263                 snd_printd(KERN_INFO "HDMI: Unknown ELD version %d\n",
 264                                                                 e->eld_ver);
 265                 goto out_fail;
 266         }
 267
 268         e->eld_size = size;
 269         e->baseline_len = GRAB_BITS(buf, 2, 0, 8);
 270         mnl             = GRAB_BITS(buf, 4, 0, 5);
 271         e->cea_edid_ver = GRAB_BITS(buf, 4, 5, 3);
 272
 273         e->support_hdcp = GRAB_BITS(buf, 5, 0, 1);
 274         e->support_ai   = GRAB_BITS(buf, 5, 1, 1);
 275         e->conn_type    = GRAB_BITS(buf, 5, 2, 2);
 276         e->sad_count    = GRAB_BITS(buf, 5, 4, 4);
 277
 278         e->aud_synch_delay = GRAB_BITS(buf, 6, 0, 8) * 2;
 279         e->spk_alloc    = GRAB_BITS(buf, 7, 0, 7);
 280
 281         e->port_id        = get_unaligned_le64(buf + 8);
 282
 283         /* not specified, but the spec's tendency is little endian */
 284         e->manufacture_id = get_unaligned_le16(buf + 16);
 285         e->product_id     = get_unaligned_le16(buf + 18);
 286
 287         if (mnl > ELD_MAX_MNL) {
 288                 snd_printd(KERN_INFO "HDMI: MNL is reserved value %d\n", mnl);
 289                 goto out_fail;
 290         } else if (ELD_FIXED_BYTES + mnl > size) {
 291                 snd_printd(KERN_INFO "HDMI: out of range MNL %d\n", mnl);
 292                 goto out_fail;
 293         } else
 294                 strlcpy(e->monitor_name, buf + ELD_FIXED_BYTES, mnl);
 295
 296         for (i = 0; i < e->sad_count; i++) {
 297                 if (ELD_FIXED_BYTES + mnl + 3 * (i + 1) > size) {
 298                         snd_printd(KERN_INFO "HDMI: out of range SAD %d\n", i);
 299                         goto out_fail;
 300                 }
 301                 hdmi_update_short_audio_desc(e->sad + i,
 302                                         buf + ELD_FIXED_BYTES + mnl + 3 * i);
 303         }
 304
 305         return 0;
 306
 307 out_fail:
 308         e->eld_ver = 0;
 309         return -EINVAL;
 310 }
 311
 312 static int hdmi_present_sense(struct hda_codec *codec, hda_nid_t nid)
 313 {
 314         return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_PIN_SENSE, 0);
 315 }
 316
 317 static int hdmi_eld_valid(struct hda_codec *codec, hda_nid_t nid)
 318 {
 319         int eldv;
 320         int present;
 321
 322         present = hdmi_present_sense(codec, nid);
 323         eldv    = (present & AC_PINSENSE_ELDV);
 324         present = (present & AC_PINSENSE_PRESENCE);
 325
 326 #ifdef CONFIG_SND_DEBUG_VERBOSE
 327         printk(KERN_INFO "HDMI: sink_present = %d, eld_valid = %d\n",
 328                         !!present, !!eldv);
 329 #endif
 330
 331         return eldv && present;
 332 }
 333
 334 int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid)
 335 {
 336         return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_SIZE,
 337                                                  AC_DIPSIZE_ELD_BUF);
 338 }
 339
 340 int snd_hdmi_get_eld(struct hdmi_eld *eld,
 341                      struct hda_codec *codec, hda_nid_t nid)
 342 {
 343         int i;
 344         int ret;
 345         int size;
 346         unsigned char *buf;
 347
 348         if (!hdmi_eld_valid(codec, nid))
 349                 return -ENOENT;
 350
 351         size = snd_hdmi_get_eld_size(codec, nid);
 352         if (size == 0) {
 353                 /* wfg: workaround for ASUS P5E-VM HDMI board */
 354                 snd_printd(KERN_INFO "HDMI: ELD buf size is 0, force 128\n");
 355                 size = 128;
 356         }
 357         if (size < ELD_FIXED_BYTES || size > PAGE_SIZE) {
 358                 snd_printd(KERN_INFO "HDMI: invalid ELD buf size %d\n", size);
 359                 return -ERANGE;
 360         }
 361
 362         buf = kmalloc(size, GFP_KERNEL);
 363         if (!buf)
 364                 return -ENOMEM;
 365
 366         for (i = 0; i < size; i++)
 367                 buf[i] = hdmi_get_eld_byte(codec, nid, i);
 368
 369         ret = hdmi_update_eld(eld, buf, size);
 370
 371         kfree(buf);
 372         return ret;
 373 }
 374
 375 static void hdmi_show_short_audio_desc(struct cea_sad *a)
 376 {
 377         char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
 378         char buf2[8 + SND_PRINT_BITS_ADVISED_BUFSIZE] = ", bits =";
 379
 380         if (!a->format)
 381                 return;
 382
 383         snd_print_pcm_rates(a->rates, buf, sizeof(buf));
 384
 385         if (a->format == AUDIO_CODING_TYPE_LPCM)
 386                 snd_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2 - 8));
 387         else if (a->max_bitrate)
 388                 snprintf(buf2, sizeof(buf2),
 389                                 ", max bitrate = %d", a->max_bitrate);
 390         else
 391                 buf2[0] = '\0';
 392
 393         printk(KERN_INFO "HDMI: supports coding type %s:"
 394                         " channels = %d, rates =%s%s\n",
 395                         cea_audio_coding_type_names[a->format],
 396                         a->channels,
 397                         buf,
 398                         buf2);
 399 }
 400
 401 void snd_print_channel_allocation(int spk_alloc, char *buf, int buflen)
 402 {
 403         int i, j;
 404
 405         for (i = 0, j = 0; i < ARRAY_SIZE(cea_speaker_allocation_names); i++) {
 406                 if (spk_alloc & (1 << i))
 407                         j += snprintf(buf + j, buflen - j,  " %s",
 408                                         cea_speaker_allocation_names[i]);
 409         }
 410         buf[j] = '\0';  /* necessary when j == 0 */
 411 }
 412
 413 void snd_hdmi_show_eld(struct hdmi_eld *e)
 414 {
 415         int i;
 416
 417         printk(KERN_INFO "HDMI: detected monitor %s at connection type %s\n",
 418                         e->monitor_name,
 419                         eld_connection_type_names[e->conn_type]);
 420
 421         if (e->spk_alloc) {
 422                 char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
 423                 snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
 424                 printk(KERN_INFO "HDMI: available speakers:%s\n", buf);
 425         }
 426
 427         for (i = 0; i < e->sad_count; i++)
 428                 hdmi_show_short_audio_desc(e->sad + i);
 429 }
 430
 431 #ifdef CONFIG_PROC_FS
 432
 433 static void hdmi_print_sad_info(int i, struct cea_sad *a,
 434                                 struct snd_info_buffer *buffer)
 435 {
 436         char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
 437
 438         snd_iprintf(buffer, "sad%d_coding_type\t[0x%x] %s\n",
 439                         i, a->format, cea_audio_coding_type_names[a->format]);
 440         snd_iprintf(buffer, "sad%d_channels\t\t%d\n", i, a->channels);
 441
 442         snd_print_pcm_rates(a->rates, buf, sizeof(buf));
 443         snd_iprintf(buffer, "sad%d_rates\t\t[0x%x]%s\n", i, a->rates, buf);
 444
 445         if (a->format == AUDIO_CODING_TYPE_LPCM) {
 446                 snd_print_pcm_bits(a->sample_bits, buf, sizeof(buf));
 447                 snd_iprintf(buffer, "sad%d_bits\t\t[0x%x]%s\n",
 448                                                         i, a->sample_bits, buf);
 449         }
 450
 451         if (a->max_bitrate)
 452                 snd_iprintf(buffer, "sad%d_max_bitrate\t%d\n",
 453                                                         i, a->max_bitrate);
 454
 455         if (a->profile)
 456                 snd_iprintf(buffer, "sad%d_profile\t\t%d\n", i, a->profile);
 457 }
 458
 459 static void hdmi_print_eld_info(struct snd_info_entry *entry,
 460                                 struct snd_info_buffer *buffer)
 461 {
 462         struct hdmi_eld *e = entry->private_data;
 463         char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
 464         int i;
 465         static char *eld_versoin_names[32] = {
 466                 "reserved",
 467                 "reserved",
 468                 "CEA-861D or below",
 469                 [3 ... 30] = "reserved",
 470                 [31] = "partial"
 471         };
 472         static char *cea_edid_version_names[8] = {
 473                 "no CEA EDID Timing Extension block present",
 474                 "CEA-861",
 475                 "CEA-861-A",
 476                 "CEA-861-B, C or D",
 477                 [4 ... 7] = "reserved"
 478         };
 479
 480         snd_iprintf(buffer, "monitor_name\t\t%s\n", e->monitor_name);
 481         snd_iprintf(buffer, "connection_type\t\t%s\n",
 482                                 eld_connection_type_names[e->conn_type]);
 483         snd_iprintf(buffer, "eld_version\t\t[0x%x] %s\n", e->eld_ver,
 484                                         eld_versoin_names[e->eld_ver]);
 485         snd_iprintf(buffer, "edid_version\t\t[0x%x] %s\n", e->cea_edid_ver,
 486                                 cea_edid_version_names[e->cea_edid_ver]);
 487         snd_iprintf(buffer, "manufacture_id\t\t0x%x\n", e->manufacture_id);
 488         snd_iprintf(buffer, "product_id\t\t0x%x\n", e->product_id);
 489         snd_iprintf(buffer, "port_id\t\t\t0x%llx\n", (long long)e->port_id);
 490         snd_iprintf(buffer, "support_hdcp\t\t%d\n", e->support_hdcp);
 491         snd_iprintf(buffer, "support_ai\t\t%d\n", e->support_ai);
 492         snd_iprintf(buffer, "audio_sync_delay\t%d\n", e->aud_synch_delay);
 493
 494         snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
 495         snd_iprintf(buffer, "speakers\t\t[0x%x]%s\n", e->spk_alloc, buf);
 496
 497         snd_iprintf(buffer, "sad_count\t\t%d\n", e->sad_count);
 498
 499         for (i = 0; i < e->sad_count; i++)
 500                 hdmi_print_sad_info(i, e->sad + i, buffer);
 501 }
 502
 503 static void hdmi_write_eld_info(struct snd_info_entry *entry,
 504                                 struct snd_info_buffer *buffer)
 505 {
 506         struct hdmi_eld *e = entry->private_data;
 507         char line[64];
 508         char name[64];
 509         char *sname;
 510         long long val;
 511         int n;
 512
 513         while (!snd_info_get_line(buffer, line, sizeof(line))) {
 514                 if (sscanf(line, "%s %llx", name, &val) != 2)
 515                         continue;
 516                 /*
 517                  * We don't allow modification to these fields:
 518                  *      monitor_name manufacture_id product_id
 519                  *      eld_version edid_version
 520                  */
 521                 if (!strcmp(name, "connection_type"))
 522                         e->conn_type = val;
 523                 else if (!strcmp(name, "port_id"))
 524                         e->port_id = val;
 525                 else if (!strcmp(name, "support_hdcp"))
 526                         e->support_hdcp = val;
 527                 else if (!strcmp(name, "support_ai"))
 528                         e->support_ai = val;
 529                 else if (!strcmp(name, "audio_sync_delay"))
 530                         e->aud_synch_delay = val;
 531                 else if (!strcmp(name, "speakers"))
 532                         e->spk_alloc = val;
 533                 else if (!strcmp(name, "sad_count"))
 534                         e->sad_count = val;
 535                 else if (!strncmp(name, "sad", 3)) {
 536                         sname = name + 4;
 537                         n = name[3] - '0';
 538                         if (name[4] >= '0' && name[4] <= '9') {
 539                                 sname++;
 540                                 n = 10 * n + name[4] - '0';
 541                         }
 542                         if (n < 0 || n > 31) /* double the CEA limit */
 543                                 continue;
 544                         if (!strcmp(sname, "_coding_type"))
 545                                 e->sad[n].format = val;
 546                         else if (!strcmp(sname, "_channels"))
 547                                 e->sad[n].channels = val;
 548                         else if (!strcmp(sname, "_rates"))
 549                                 e->sad[n].rates = val;
 550                         else if (!strcmp(sname, "_bits"))
 551                                 e->sad[n].sample_bits = val;
 552                         else if (!strcmp(sname, "_max_bitrate"))
 553                                 e->sad[n].max_bitrate = val;
 554                         else if (!strcmp(sname, "_profile"))
 555                                 e->sad[n].profile = val;
 556                         if (n >= e->sad_count)
 557                                 e->sad_count = n + 1;
 558                 }
 559         }
 560 }
 561
 562
 563 int snd_hda_eld_proc_new(struct hda_codec *codec, struct hdmi_eld *eld)
 564 {
 565         char name[32];
 566         struct snd_info_entry *entry;
 567         int err;
 568
 569         snprintf(name, sizeof(name), "eld#%d", codec->addr);
 570         err = snd_card_proc_new(codec->bus->card, name, &entry);
 571         if (err < 0)
 572                 return err;
 573
 574         snd_info_set_text_ops(entry, eld, hdmi_print_eld_info);
 575         entry->c.text.write = hdmi_write_eld_info;
 576         entry->mode |= S_IWUSR;
 577         eld->proc_entry = entry;
 578
 579         return 0;
 580 }
 581
 582 void snd_hda_eld_proc_free(struct hda_codec *codec, struct hdmi_eld *eld)
 583 {
 584         if (!codec->bus->shutdown && eld->proc_entry) {
 585                 snd_device_free(codec->bus->card, eld->proc_entry);
 586                 eld->proc_entry = NULL;
 587         }
 588 }
 589
 590 #endif /* CONFIG_PROC_FS */