linux/sound/pci/hda/hda_eld.c
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   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
  31enum eld_versions {
  32        ELD_VER_CEA_861D        = 2,
  33        ELD_VER_PARTIAL         = 31,
  34};
  35
  36enum 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
  44static 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
  58static char *eld_connection_type_names[4] = {
  59        "HDMI",
  60        "DisplayPort",
  61        "2-reserved",
  62        "3-reserved"
  63};
  64
  65enum 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
  88enum 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
  96static 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 */
 126static 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 */
 136static 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
 147static 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
 177static 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 */
 257static 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);
 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
 310out_fail:
 311        e->eld_ver = 0;
 312        return -EINVAL;
 313}
 314
 315static int hdmi_eld_valid(struct hda_codec *codec, hda_nid_t nid)
 316{
 317        int eldv;
 318        int present;
 319
 320        present = snd_hda_pin_sense(codec, nid);
 321        eldv    = (present & AC_PINSENSE_ELDV);
 322        present = (present & AC_PINSENSE_PRESENCE);
 323
 324#ifdef CONFIG_SND_DEBUG_VERBOSE
 325        printk(KERN_INFO "HDMI: sink_present = %d, eld_valid = %d\n",
 326                        !!present, !!eldv);
 327#endif
 328
 329        return eldv && present;
 330}
 331
 332int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid)
 333{
 334        return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_SIZE,
 335                                                 AC_DIPSIZE_ELD_BUF);
 336}
 337
 338int snd_hdmi_get_eld(struct hdmi_eld *eld,
 339                     struct hda_codec *codec, hda_nid_t nid)
 340{
 341        int i;
 342        int ret;
 343        int size;
 344        unsigned char *buf;
 345
 346        if (!hdmi_eld_valid(codec, nid))
 347                return -ENOENT;
 348
 349        size = snd_hdmi_get_eld_size(codec, nid);
 350        if (size == 0) {
 351                /* wfg: workaround for ASUS P5E-VM HDMI board */
 352                snd_printd(KERN_INFO "HDMI: ELD buf size is 0, force 128\n");
 353                size = 128;
 354        }
 355        if (size < ELD_FIXED_BYTES || size > PAGE_SIZE) {
 356                snd_printd(KERN_INFO "HDMI: invalid ELD buf size %d\n", size);
 357                return -ERANGE;
 358        }
 359
 360        buf = kmalloc(size, GFP_KERNEL);
 361        if (!buf)
 362                return -ENOMEM;
 363
 364        for (i = 0; i < size; i++)
 365                buf[i] = hdmi_get_eld_byte(codec, nid, i);
 366
 367        ret = hdmi_update_eld(eld, buf, size);
 368
 369        kfree(buf);
 370        return ret;
 371}
 372
 373static void hdmi_show_short_audio_desc(struct cea_sad *a)
 374{
 375        char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
 376        char buf2[8 + SND_PRINT_BITS_ADVISED_BUFSIZE] = ", bits =";
 377
 378        if (!a->format)
 379                return;
 380
 381        snd_print_pcm_rates(a->rates, buf, sizeof(buf));
 382
 383        if (a->format == AUDIO_CODING_TYPE_LPCM)
 384                snd_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2) - 8);
 385        else if (a->max_bitrate)
 386                snprintf(buf2, sizeof(buf2),
 387                                ", max bitrate = %d", a->max_bitrate);
 388        else
 389                buf2[0] = '\0';
 390
 391        printk(KERN_INFO "HDMI: supports coding type %s:"
 392                        " channels = %d, rates =%s%s\n",
 393                        cea_audio_coding_type_names[a->format],
 394                        a->channels,
 395                        buf,
 396                        buf2);
 397}
 398
 399void snd_print_channel_allocation(int spk_alloc, char *buf, int buflen)
 400{
 401        int i, j;
 402
 403        for (i = 0, j = 0; i < ARRAY_SIZE(cea_speaker_allocation_names); i++) {
 404                if (spk_alloc & (1 << i))
 405                        j += snprintf(buf + j, buflen - j,  " %s",
 406                                        cea_speaker_allocation_names[i]);
 407        }
 408        buf[j] = '\0';  /* necessary when j == 0 */
 409}
 410
 411void snd_hdmi_show_eld(struct hdmi_eld *e)
 412{
 413        int i;
 414
 415        printk(KERN_INFO "HDMI: detected monitor %s at connection type %s\n",
 416                        e->monitor_name,
 417                        eld_connection_type_names[e->conn_type]);
 418
 419        if (e->spk_alloc) {
 420                char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
 421                snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
 422                printk(KERN_INFO "HDMI: available speakers:%s\n", buf);
 423        }
 424
 425        for (i = 0; i < e->sad_count; i++)
 426                hdmi_show_short_audio_desc(e->sad + i);
 427}
 428
 429#ifdef CONFIG_PROC_FS
 430
 431static void hdmi_print_sad_info(int i, struct cea_sad *a,
 432                                struct snd_info_buffer *buffer)
 433{
 434        char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
 435
 436        snd_iprintf(buffer, "sad%d_coding_type\t[0x%x] %s\n",
 437                        i, a->format, cea_audio_coding_type_names[a->format]);
 438        snd_iprintf(buffer, "sad%d_channels\t\t%d\n", i, a->channels);
 439
 440        snd_print_pcm_rates(a->rates, buf, sizeof(buf));
 441        snd_iprintf(buffer, "sad%d_rates\t\t[0x%x]%s\n", i, a->rates, buf);
 442
 443        if (a->format == AUDIO_CODING_TYPE_LPCM) {
 444                snd_print_pcm_bits(a->sample_bits, buf, sizeof(buf));
 445                snd_iprintf(buffer, "sad%d_bits\t\t[0x%x]%s\n",
 446                                                        i, a->sample_bits, buf);
 447        }
 448
 449        if (a->max_bitrate)
 450                snd_iprintf(buffer, "sad%d_max_bitrate\t%d\n",
 451                                                        i, a->max_bitrate);
 452
 453        if (a->profile)
 454                snd_iprintf(buffer, "sad%d_profile\t\t%d\n", i, a->profile);
 455}
 456
 457static void hdmi_print_eld_info(struct snd_info_entry *entry,
 458                                struct snd_info_buffer *buffer)
 459{
 460        struct hdmi_eld *e = entry->private_data;
 461        char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
 462        int i;
 463        static char *eld_versoin_names[32] = {
 464                "reserved",
 465                "reserved",
 466                "CEA-861D or below",
 467                [3 ... 30] = "reserved",
 468                [31] = "partial"
 469        };
 470        static char *cea_edid_version_names[8] = {
 471                "no CEA EDID Timing Extension block present",
 472                "CEA-861",
 473                "CEA-861-A",
 474                "CEA-861-B, C or D",
 475                [4 ... 7] = "reserved"
 476        };
 477
 478        snd_iprintf(buffer, "monitor_present\t\t%d\n", e->monitor_present);
 479        snd_iprintf(buffer, "eld_valid\t\t%d\n", e->eld_valid);
 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
 503static 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        unsigned 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, "monitor_present"))
 522                        e->monitor_present = val;
 523                else if (!strcmp(name, "eld_valid"))
 524                        e->eld_valid = val;
 525                else if (!strcmp(name, "connection_type"))
 526                        e->conn_type = val;
 527                else if (!strcmp(name, "port_id"))
 528                        e->port_id = val;
 529                else if (!strcmp(name, "support_hdcp"))
 530                        e->support_hdcp = val;
 531                else if (!strcmp(name, "support_ai"))
 532                        e->support_ai = val;
 533                else if (!strcmp(name, "audio_sync_delay"))
 534                        e->aud_synch_delay = val;
 535                else if (!strcmp(name, "speakers"))
 536                        e->spk_alloc = val;
 537                else if (!strcmp(name, "sad_count"))
 538                        e->sad_count = val;
 539                else if (!strncmp(name, "sad", 3)) {
 540                        sname = name + 4;
 541                        n = name[3] - '0';
 542                        if (name[4] >= '0' && name[4] <= '9') {
 543                                sname++;
 544                                n = 10 * n + name[4] - '0';
 545                        }
 546                        if (n >= ELD_MAX_SAD)
 547                                continue;
 548                        if (!strcmp(sname, "_coding_type"))
 549                                e->sad[n].format = val;
 550                        else if (!strcmp(sname, "_channels"))
 551                                e->sad[n].channels = val;
 552                        else if (!strcmp(sname, "_rates"))
 553                                e->sad[n].rates = val;
 554                        else if (!strcmp(sname, "_bits"))
 555                                e->sad[n].sample_bits = val;
 556                        else if (!strcmp(sname, "_max_bitrate"))
 557                                e->sad[n].max_bitrate = val;
 558                        else if (!strcmp(sname, "_profile"))
 559                                e->sad[n].profile = val;
 560                        if (n >= e->sad_count)
 561                                e->sad_count = n + 1;
 562                }
 563        }
 564}
 565
 566
 567int snd_hda_eld_proc_new(struct hda_codec *codec, struct hdmi_eld *eld,
 568                         int index)
 569{
 570        char name[32];
 571        struct snd_info_entry *entry;
 572        int err;
 573
 574        snprintf(name, sizeof(name), "eld#%d.%d", codec->addr, index);
 575        err = snd_card_proc_new(codec->bus->card, name, &entry);
 576        if (err < 0)
 577                return err;
 578
 579        snd_info_set_text_ops(entry, eld, hdmi_print_eld_info);
 580        entry->c.text.write = hdmi_write_eld_info;
 581        entry->mode |= S_IWUSR;
 582        eld->proc_entry = entry;
 583
 584        return 0;
 585}
 586
 587void snd_hda_eld_proc_free(struct hda_codec *codec, struct hdmi_eld *eld)
 588{
 589        if (!codec->bus->shutdown && eld->proc_entry) {
 590                snd_device_free(codec->bus->card, eld->proc_entry);
 591                eld->proc_entry = NULL;
 592        }
 593}
 594
 595#endif /* CONFIG_PROC_FS */
 596
 597/* update PCM info based on ELD */
 598void hdmi_eld_update_pcm_info(struct hdmi_eld *eld, struct hda_pcm_stream *pcm,
 599                              struct hda_pcm_stream *codec_pars)
 600{
 601        int i;
 602
 603        /* assume basic audio support (the basic audio flag is not in ELD;
 604         * however, all audio capable sinks are required to support basic
 605         * audio) */
 606        pcm->rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000;
 607        pcm->formats = SNDRV_PCM_FMTBIT_S16_LE;
 608        pcm->maxbps = 16;
 609        pcm->channels_max = 2;
 610        for (i = 0; i < eld->sad_count; i++) {
 611                struct cea_sad *a = &eld->sad[i];
 612                pcm->rates |= a->rates;
 613                if (a->channels > pcm->channels_max)
 614                        pcm->channels_max = a->channels;
 615                if (a->format == AUDIO_CODING_TYPE_LPCM) {
 616                        if (a->sample_bits & AC_SUPPCM_BITS_20) {
 617                                pcm->formats |= SNDRV_PCM_FMTBIT_S32_LE;
 618                                if (pcm->maxbps < 20)
 619                                        pcm->maxbps = 20;
 620                        }
 621                        if (a->sample_bits & AC_SUPPCM_BITS_24) {
 622                                pcm->formats |= SNDRV_PCM_FMTBIT_S32_LE;
 623                                if (pcm->maxbps < 24)
 624                                        pcm->maxbps = 24;
 625                        }
 626                }
 627        }
 628
 629        if (!codec_pars)
 630                return;
 631
 632        /* restrict the parameters by the values the codec provides */
 633        pcm->rates &= codec_pars->rates;
 634        pcm->formats &= codec_pars->formats;
 635        pcm->channels_max = min(pcm->channels_max, codec_pars->channels_max);
 636        pcm->maxbps = min(pcm->maxbps, codec_pars->maxbps);
 637}
 638