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->format = GRAB_BITS(buf, 0, 3, 4); 193 switch (a->format) { 194 case AUDIO_CODING_TYPE_REF_STREAM_HEADER: 195 snd_printd(KERN_INFO 196 "HDMI: audio coding type 0 not expected\n"); 197 break; 198 199 case AUDIO_CODING_TYPE_LPCM: 200 val = GRAB_BITS(buf, 2, 0, 3); 201 a->sample_bits = 0; 202 for (i = 0; i < 3; i++) 203 if (val & (1 << i)) 204 a->sample_bits |= cea_sample_sizes[i + 1]; 205 break; 206 207 case AUDIO_CODING_TYPE_AC3: 208 case AUDIO_CODING_TYPE_MPEG1: 209 case AUDIO_CODING_TYPE_MP3: 210 case AUDIO_CODING_TYPE_MPEG2: 211 case AUDIO_CODING_TYPE_AACLC: 212 case AUDIO_CODING_TYPE_DTS: 213 case AUDIO_CODING_TYPE_ATRAC: 214 a->max_bitrate = GRAB_BITS(buf, 2, 0, 8); 215 a->max_bitrate *= 8000; 216 break; 217 218 case AUDIO_CODING_TYPE_SACD: 219 break; 220 221 case AUDIO_CODING_TYPE_EAC3: 222 break; 223 224 case AUDIO_CODING_TYPE_DTS_HD: 225 break; 226 227 case AUDIO_CODING_TYPE_MLP: 228 break; 229 230 case AUDIO_CODING_TYPE_DST: 231 break; 232 233 case AUDIO_CODING_TYPE_WMAPRO: 234 a->profile = GRAB_BITS(buf, 2, 0, 3); 235 break; 236 237 case AUDIO_CODING_TYPE_REF_CXT: 238 a->format = GRAB_BITS(buf, 2, 3, 5); 239 if (a->format == AUDIO_CODING_XTYPE_HE_REF_CT || 240 a->format >= AUDIO_CODING_XTYPE_FIRST_RESERVED) { 241 snd_printd(KERN_INFO 242 "HDMI: audio coding xtype %d not expected\n", 243 a->format); 244 a->format = 0; 245 } else 246 a->format += AUDIO_CODING_TYPE_HE_AAC - 247 AUDIO_CODING_XTYPE_HE_AAC; 248 break; 249 } 250} 251 252/* 253 * Be careful, ELD buf could be totally rubbish! 254 */ 255static int hdmi_update_eld(struct hdmi_eld *e, 256 const unsigned char *buf, int size) 257{ 258 int mnl; 259 int i; 260 261 e->eld_ver = GRAB_BITS(buf, 0, 3, 5); 262 if (e->eld_ver != ELD_VER_CEA_861D && 263 e->eld_ver != ELD_VER_PARTIAL) { 264 snd_printd(KERN_INFO "HDMI: Unknown ELD version %d\n", 265 e->eld_ver); 266 goto out_fail; 267 } 268 269 e->eld_size = size; 270 e->baseline_len = GRAB_BITS(buf, 2, 0, 8); 271 mnl = GRAB_BITS(buf, 4, 0, 5); 272 e->cea_edid_ver = GRAB_BITS(buf, 4, 5, 3); 273 274 e->support_hdcp = GRAB_BITS(buf, 5, 0, 1); 275 e->support_ai = GRAB_BITS(buf, 5, 1, 1); 276 e->conn_type = GRAB_BITS(buf, 5, 2, 2); 277 e->sad_count = GRAB_BITS(buf, 5, 4, 4); 278 279 e->aud_synch_delay = GRAB_BITS(buf, 6, 0, 8) * 2; 280 e->spk_alloc = GRAB_BITS(buf, 7, 0, 7); 281 282 e->port_id = get_unaligned_le64(buf + 8); 283 284 /* not specified, but the spec's tendency is little endian */ 285 e->manufacture_id = get_unaligned_le16(buf + 16); 286 e->product_id = get_unaligned_le16(buf + 18); 287 288 if (mnl > ELD_MAX_MNL) { 289 snd_printd(KERN_INFO "HDMI: MNL is reserved value %d\n", mnl); 290 goto out_fail; 291 } else if (ELD_FIXED_BYTES + mnl > size) { 292 snd_printd(KERN_INFO "HDMI: out of range MNL %d\n", mnl); 293 goto out_fail; 294 } else 295 strlcpy(e->monitor_name, buf + ELD_FIXED_BYTES, mnl); 296 297 for (i = 0; i < e->sad_count; i++) { 298 if (ELD_FIXED_BYTES + mnl + 3 * (i + 1) > size) { 299 snd_printd(KERN_INFO "HDMI: out of range SAD %d\n", i); 300 goto out_fail; 301 } 302 hdmi_update_short_audio_desc(e->sad + i, 303 buf + ELD_FIXED_BYTES + mnl + 3 * i); 304 } 305 306 return 0; 307 308out_fail: 309 e->eld_ver = 0; 310 return -EINVAL; 311} 312 313static int hdmi_eld_valid(struct hda_codec *codec, hda_nid_t nid) 314{ 315 int eldv; 316 int present; 317 318 present = snd_hda_pin_sense(codec, nid); 319 eldv = (present & AC_PINSENSE_ELDV); 320 present = (present & AC_PINSENSE_PRESENCE); 321 322#ifdef CONFIG_SND_DEBUG_VERBOSE 323 printk(KERN_INFO "HDMI: sink_present = %d, eld_valid = %d\n", 324 !!present, !!eldv); 325#endif 326 327 return eldv && present; 328} 329 330int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid) 331{ 332 return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_SIZE, 333 AC_DIPSIZE_ELD_BUF); 334} 335EXPORT_SYMBOL_HDA(snd_hdmi_get_eld_size); 336 337int snd_hdmi_get_eld(struct hdmi_eld *eld, 338 struct hda_codec *codec, hda_nid_t nid) 339{ 340 int i; 341 int ret; 342 int size; 343 unsigned char *buf; 344 345 if (!hdmi_eld_valid(codec, nid)) 346 return -ENOENT; 347 348 size = snd_hdmi_get_eld_size(codec, nid); 349 if (size == 0) { 350 snd_printd(KERN_INFO "HDMI: ELD buf size is 0, force 128\n"); 351 size = 128; 352 } 353 if (size < ELD_FIXED_BYTES || size > PAGE_SIZE) { 354 snd_printd(KERN_INFO "HDMI: invalid ELD buf size %d\n", size); 355 return -ERANGE; 356 } 357 358 buf = kmalloc(size, GFP_KERNEL); 359 if (!buf) 360 return -ENOMEM; 361 362 for (i = 0; i < size; i++) 363 buf[i] = hdmi_get_eld_byte(codec, nid, i); 364 365 ret = hdmi_update_eld(eld, buf, size); 366 367 kfree(buf); 368 return ret; 369} 370EXPORT_SYMBOL_HDA(snd_hdmi_get_eld); 371 372static void hdmi_show_short_audio_desc(struct cea_sad *a) 373{ 374 char buf[SND_PRINT_RATES_ADVISED_BUFSIZE]; 375 char buf2[8 + SND_PRINT_BITS_ADVISED_BUFSIZE] = ", bits ="; 376 377 if (!a->format) 378 return; 379 380 snd_print_pcm_rates(a->rates, buf, sizeof(buf)); 381 382 if (a->format == AUDIO_CODING_TYPE_LPCM) 383 snd_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2) - 8); 384 else if (a->max_bitrate) 385 snprintf(buf2, sizeof(buf2), 386 ", max bitrate = %d", a->max_bitrate); 387 else 388 buf2[0] = '\0'; 389 390 printk(KERN_INFO "HDMI: supports coding type %s:" 391 " channels = %d, rates =%s%s\n", 392 cea_audio_coding_type_names[a->format], 393 a->channels, 394 buf, 395 buf2); 396} 397 398void snd_print_channel_allocation(int spk_alloc, char *buf, int buflen) 399{ 400 int i, j; 401 402 for (i = 0, j = 0; i < ARRAY_SIZE(cea_speaker_allocation_names); i++) { 403 if (spk_alloc & (1 << i)) 404 j += snprintf(buf + j, buflen - j, " %s", 405 cea_speaker_allocation_names[i]); 406 } 407 buf[j] = '\0'; /* necessary when j == 0 */ 408} 409EXPORT_SYMBOL_HDA(snd_print_channel_allocation); 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} 428EXPORT_SYMBOL_HDA(snd_hdmi_show_eld); 429 430#ifdef CONFIG_PROC_FS 431 432static void hdmi_print_sad_info(int i, struct cea_sad *a, 433 struct snd_info_buffer *buffer) 434{ 435 char buf[SND_PRINT_RATES_ADVISED_BUFSIZE]; 436 437 snd_iprintf(buffer, "sad%d_coding_type\t[0x%x] %s\n", 438 i, a->format, cea_audio_coding_type_names[a->format]); 439 snd_iprintf(buffer, "sad%d_channels\t\t%d\n", i, a->channels); 440 441 snd_print_pcm_rates(a->rates, buf, sizeof(buf)); 442 snd_iprintf(buffer, "sad%d_rates\t\t[0x%x]%s\n", i, a->rates, buf); 443 444 if (a->format == AUDIO_CODING_TYPE_LPCM) { 445 snd_print_pcm_bits(a->sample_bits, buf, sizeof(buf)); 446 snd_iprintf(buffer, "sad%d_bits\t\t[0x%x]%s\n", 447 i, a->sample_bits, buf); 448 } 449 450 if (a->max_bitrate) 451 snd_iprintf(buffer, "sad%d_max_bitrate\t%d\n", 452 i, a->max_bitrate); 453 454 if (a->profile) 455 snd_iprintf(buffer, "sad%d_profile\t\t%d\n", i, a->profile); 456} 457 458static void hdmi_print_eld_info(struct snd_info_entry *entry, 459 struct snd_info_buffer *buffer) 460{ 461 struct hdmi_eld *e = entry->private_data; 462 char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE]; 463 int i; 464 static char *eld_versoin_names[32] = { 465 "reserved", 466 "reserved", 467 "CEA-861D or below", 468 [3 ... 30] = "reserved", 469 [31] = "partial" 470 }; 471 static char *cea_edid_version_names[8] = { 472 "no CEA EDID Timing Extension block present", 473 "CEA-861", 474 "CEA-861-A", 475 "CEA-861-B, C or D", 476 [4 ... 7] = "reserved" 477 }; 478 479 snd_iprintf(buffer, "monitor_present\t\t%d\n", e->monitor_present); 480 snd_iprintf(buffer, "eld_valid\t\t%d\n", e->eld_valid); 481 snd_iprintf(buffer, "monitor_name\t\t%s\n", e->monitor_name); 482 snd_iprintf(buffer, "connection_type\t\t%s\n", 483 eld_connection_type_names[e->conn_type]); 484 snd_iprintf(buffer, "eld_version\t\t[0x%x] %s\n", e->eld_ver, 485 eld_versoin_names[e->eld_ver]); 486 snd_iprintf(buffer, "edid_version\t\t[0x%x] %s\n", e->cea_edid_ver, 487 cea_edid_version_names[e->cea_edid_ver]); 488 snd_iprintf(buffer, "manufacture_id\t\t0x%x\n", e->manufacture_id); 489 snd_iprintf(buffer, "product_id\t\t0x%x\n", e->product_id); 490 snd_iprintf(buffer, "port_id\t\t\t0x%llx\n", (long long)e->port_id); 491 snd_iprintf(buffer, "support_hdcp\t\t%d\n", e->support_hdcp); 492 snd_iprintf(buffer, "support_ai\t\t%d\n", e->support_ai); 493 snd_iprintf(buffer, "audio_sync_delay\t%d\n", e->aud_synch_delay); 494 495 snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf)); 496 snd_iprintf(buffer, "speakers\t\t[0x%x]%s\n", e->spk_alloc, buf); 497 498 snd_iprintf(buffer, "sad_count\t\t%d\n", e->sad_count); 499 500 for (i = 0; i < e->sad_count; i++) 501 hdmi_print_sad_info(i, e->sad + i, buffer); 502} 503 504static void hdmi_write_eld_info(struct snd_info_entry *entry, 505 struct snd_info_buffer *buffer) 506{ 507 struct hdmi_eld *e = entry->private_data; 508 char line[64]; 509 char name[64]; 510 char *sname; 511 long long val; 512 unsigned int n; 513 514 while (!snd_info_get_line(buffer, line, sizeof(line))) { 515 if (sscanf(line, "%s %llx", name, &val) != 2) 516 continue; 517 /* 518 * We don't allow modification to these fields: 519 * monitor_name manufacture_id product_id 520 * eld_version edid_version 521 */ 522 if (!strcmp(name, "monitor_present")) 523 e->monitor_present = val; 524 else if (!strcmp(name, "eld_valid")) 525 e->eld_valid = val; 526 else if (!strcmp(name, "connection_type")) 527 e->conn_type = val; 528 else if (!strcmp(name, "port_id")) 529 e->port_id = val; 530 else if (!strcmp(name, "support_hdcp")) 531 e->support_hdcp = val; 532 else if (!strcmp(name, "support_ai")) 533 e->support_ai = val; 534 else if (!strcmp(name, "audio_sync_delay")) 535 e->aud_synch_delay = val; 536 else if (!strcmp(name, "speakers")) 537 e->spk_alloc = val; 538 else if (!strcmp(name, "sad_count")) 539 e->sad_count = val; 540 else if (!strncmp(name, "sad", 3)) { 541 sname = name + 4; 542 n = name[3] - '0'; 543 if (name[4] >= '0' && name[4] <= '9') { 544 sname++; 545 n = 10 * n + name[4] - '0'; 546 } 547 if (n >= ELD_MAX_SAD) 548 continue; 549 if (!strcmp(sname, "_coding_type")) 550 e->sad[n].format = val; 551 else if (!strcmp(sname, "_channels")) 552 e->sad[n].channels = val; 553 else if (!strcmp(sname, "_rates")) 554 e->sad[n].rates = val; 555 else if (!strcmp(sname, "_bits")) 556 e->sad[n].sample_bits = val; 557 else if (!strcmp(sname, "_max_bitrate")) 558 e->sad[n].max_bitrate = val; 559 else if (!strcmp(sname, "_profile")) 560 e->sad[n].profile = val; 561 if (n >= e->sad_count) 562 e->sad_count = n + 1; 563 } 564 } 565} 566 567 568int snd_hda_eld_proc_new(struct hda_codec *codec, struct hdmi_eld *eld, 569 int index) 570{ 571 char name[32]; 572 struct snd_info_entry *entry; 573 int err; 574 575 snprintf(name, sizeof(name), "eld#%d.%d", codec->addr, index); 576 err = snd_card_proc_new(codec->bus->card, name, &entry); 577 if (err < 0) 578 return err; 579 580 snd_info_set_text_ops(entry, eld, hdmi_print_eld_info); 581 entry->c.text.write = hdmi_write_eld_info; 582 entry->mode |= S_IWUSR; 583 eld->proc_entry = entry; 584 585 return 0; 586} 587EXPORT_SYMBOL_HDA(snd_hda_eld_proc_new); 588 589void snd_hda_eld_proc_free(struct hda_codec *codec, struct hdmi_eld *eld) 590{ 591 if (!codec->bus->shutdown && eld->proc_entry) { 592 snd_device_free(codec->bus->card, eld->proc_entry); 593 eld->proc_entry = NULL; 594 } 595} 596EXPORT_SYMBOL_HDA(snd_hda_eld_proc_free); 597 598#endif /* CONFIG_PROC_FS */ 599 600/* update PCM info based on ELD */ 601void hdmi_eld_update_pcm_info(struct hdmi_eld *eld, struct hda_pcm_stream *pcm, 602 struct hda_pcm_stream *codec_pars) 603{ 604 int i; 605 606 /* assume basic audio support (the basic audio flag is not in ELD; 607 * however, all audio capable sinks are required to support basic 608 * audio) */ 609 pcm->rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000; 610 pcm->formats = SNDRV_PCM_FMTBIT_S16_LE; 611 pcm->maxbps = 16; 612 pcm->channels_max = 2; 613 for (i = 0; i < eld->sad_count; i++) { 614 struct cea_sad *a = &eld->sad[i]; 615 pcm->rates |= a->rates; 616 if (a->channels > pcm->channels_max) 617 pcm->channels_max = a->channels; 618 if (a->format == AUDIO_CODING_TYPE_LPCM) { 619 if (a->sample_bits & AC_SUPPCM_BITS_20) { 620 pcm->formats |= SNDRV_PCM_FMTBIT_S32_LE; 621 if (pcm->maxbps < 20) 622 pcm->maxbps = 20; 623 } 624 if (a->sample_bits & AC_SUPPCM_BITS_24) { 625 pcm->formats |= SNDRV_PCM_FMTBIT_S32_LE; 626 if (pcm->maxbps < 24) 627 pcm->maxbps = 24; 628 } 629 } 630 } 631 632 if (!codec_pars) 633 return; 634 635 /* restrict the parameters by the values the codec provides */ 636 pcm->rates &= codec_pars->rates; 637 pcm->formats &= codec_pars->formats; 638 pcm->channels_max = min(pcm->channels_max, codec_pars->channels_max); 639 pcm->maxbps = min(pcm->maxbps, codec_pars->maxbps); 640} 641EXPORT_SYMBOL_HDA(hdmi_eld_update_pcm_info); 642