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 int snd_hdmi_parse_eld(struct parsed_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->baseline_len = GRAB_BITS(buf, 2, 0, 8); 264 mnl = GRAB_BITS(buf, 4, 0, 5); 265 e->cea_edid_ver = GRAB_BITS(buf, 4, 5, 3); 266 267 e->support_hdcp = GRAB_BITS(buf, 5, 0, 1); 268 e->support_ai = GRAB_BITS(buf, 5, 1, 1); 269 e->conn_type = GRAB_BITS(buf, 5, 2, 2); 270 e->sad_count = GRAB_BITS(buf, 5, 4, 4); 271 272 e->aud_synch_delay = GRAB_BITS(buf, 6, 0, 8) * 2; 273 e->spk_alloc = GRAB_BITS(buf, 7, 0, 7); 274 275 e->port_id = get_unaligned_le64(buf + 8); 276 277 /* not specified, but the spec's tendency is little endian */ 278 e->manufacture_id = get_unaligned_le16(buf + 16); 279 e->product_id = get_unaligned_le16(buf + 18); 280 281 if (mnl > ELD_MAX_MNL) { 282 snd_printd(KERN_INFO "HDMI: MNL is reserved value %d\n", mnl); 283 goto out_fail; 284 } else if (ELD_FIXED_BYTES + mnl > size) { 285 snd_printd(KERN_INFO "HDMI: out of range MNL %d\n", mnl); 286 goto out_fail; 287 } else 288 strlcpy(e->monitor_name, buf + ELD_FIXED_BYTES, mnl + 1); 289 290 for (i = 0; i < e->sad_count; i++) { 291 if (ELD_FIXED_BYTES + mnl + 3 * (i + 1) > size) { 292 snd_printd(KERN_INFO "HDMI: out of range SAD %d\n", i); 293 goto out_fail; 294 } 295 hdmi_update_short_audio_desc(e->sad + i, 296 buf + ELD_FIXED_BYTES + mnl + 3 * i); 297 } 298 299 /* 300 * HDMI sink's ELD info cannot always be retrieved for now, e.g. 301 * in console or for audio devices. Assume the highest speakers 302 * configuration, to _not_ prohibit multi-channel audio playback. 303 */ 304 if (!e->spk_alloc) 305 e->spk_alloc = 0xffff; 306 307 return 0; 308 309 out_fail: 310 return -EINVAL; 311 } 312 313 int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid) 314 { 315 return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_SIZE, 316 AC_DIPSIZE_ELD_BUF); 317 } 318 319 int snd_hdmi_get_eld(struct hda_codec *codec, hda_nid_t nid, 320 unsigned char *buf, int *eld_size) 321 { 322 int i; 323 int ret = 0; 324 int size; 325 326 /* 327 * ELD size is initialized to zero in caller function. If no errors and 328 * ELD is valid, actual eld_size is assigned. 329 */ 330 331 size = snd_hdmi_get_eld_size(codec, nid); 332 if (size == 0) { 333 /* wfg: workaround for ASUS P5E-VM HDMI board */ 334 snd_printd(KERN_INFO "HDMI: ELD buf size is 0, force 128\n"); 335 size = 128; 336 } 337 if (size < ELD_FIXED_BYTES || size > ELD_MAX_SIZE) { 338 snd_printd(KERN_INFO "HDMI: invalid ELD buf size %d\n", size); 339 return -ERANGE; 340 } 341 342 /* set ELD buffer */ 343 for (i = 0; i < size; i++) { 344 unsigned int val = hdmi_get_eld_data(codec, nid, i); 345 /* 346 * Graphics driver might be writing to ELD buffer right now. 347 * Just abort. The caller will repoll after a while. 348 */ 349 if (!(val & AC_ELDD_ELD_VALID)) { 350 snd_printd(KERN_INFO 351 "HDMI: invalid ELD data byte %d\n", i); 352 ret = -EINVAL; 353 goto error; 354 } 355 val &= AC_ELDD_ELD_DATA; 356 /* 357 * The first byte cannot be zero. This can happen on some DVI 358 * connections. Some Intel chips may also need some 250ms delay 359 * to return non-zero ELD data, even when the graphics driver 360 * correctly writes ELD content before setting ELD_valid bit. 361 */ 362 if (!val && !i) { 363 snd_printdd(KERN_INFO "HDMI: 0 ELD data\n"); 364 ret = -EINVAL; 365 goto error; 366 } 367 buf[i] = val; 368 } 369 370 *eld_size = size; 371 error: 372 return ret; 373 } 374 375 /** 376 * SNDRV_PCM_RATE_* and AC_PAR_PCM values don't match, print correct rates with 377 * hdmi-specific routine. 378 */ 379 static void hdmi_print_pcm_rates(int pcm, char *buf, int buflen) 380 { 381 static unsigned int alsa_rates[] = { 382 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000, 64000, 383 88200, 96000, 176400, 192000, 384000 384 }; 385 int i, j; 386 387 for (i = 0, j = 0; i < ARRAY_SIZE(alsa_rates); i++) 388 if (pcm & (1 << i)) 389 j += snprintf(buf + j, buflen - j, " %d", 390 alsa_rates[i]); 391 392 buf[j] = '\0'; /* necessary when j == 0 */ 393 } 394 395 #define SND_PRINT_RATES_ADVISED_BUFSIZE 80 396 397 static void hdmi_show_short_audio_desc(struct cea_sad *a) 398 { 399 char buf[SND_PRINT_RATES_ADVISED_BUFSIZE]; 400 char buf2[8 + SND_PRINT_BITS_ADVISED_BUFSIZE] = ", bits ="; 401 402 if (!a->format) 403 return; 404 405 hdmi_print_pcm_rates(a->rates, buf, sizeof(buf)); 406 407 if (a->format == AUDIO_CODING_TYPE_LPCM) 408 snd_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2) - 8); 409 else if (a->max_bitrate) 410 snprintf(buf2, sizeof(buf2), 411 ", max bitrate = %d", a->max_bitrate); 412 else 413 buf2[0] = '\0'; 414 415 _snd_printd(SND_PR_VERBOSE, "HDMI: supports coding type %s:" 416 " channels = %d, rates =%s%s\n", 417 cea_audio_coding_type_names[a->format], 418 a->channels, 419 buf, 420 buf2); 421 } 422 423 void snd_print_channel_allocation(int spk_alloc, char *buf, int buflen) 424 { 425 int i, j; 426 427 for (i = 0, j = 0; i < ARRAY_SIZE(cea_speaker_allocation_names); i++) { 428 if (spk_alloc & (1 << i)) 429 j += snprintf(buf + j, buflen - j, " %s", 430 cea_speaker_allocation_names[i]); 431 } 432 buf[j] = '\0'; /* necessary when j == 0 */ 433 } 434 435 void snd_hdmi_show_eld(struct parsed_hdmi_eld *e) 436 { 437 int i; 438 439 _snd_printd(SND_PR_VERBOSE, "HDMI: detected monitor %s at connection type %s\n", 440 e->monitor_name, 441 eld_connection_type_names[e->conn_type]); 442 443 if (e->spk_alloc) { 444 char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE]; 445 snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf)); 446 _snd_printd(SND_PR_VERBOSE, "HDMI: available speakers:%s\n", buf); 447 } 448 449 for (i = 0; i < e->sad_count; i++) 450 hdmi_show_short_audio_desc(e->sad + i); 451 } 452 453 #ifdef CONFIG_PROC_FS 454 455 static void hdmi_print_sad_info(int i, struct cea_sad *a, 456 struct snd_info_buffer *buffer) 457 { 458 char buf[SND_PRINT_RATES_ADVISED_BUFSIZE]; 459 460 snd_iprintf(buffer, "sad%d_coding_type\t[0x%x] %s\n", 461 i, a->format, cea_audio_coding_type_names[a->format]); 462 snd_iprintf(buffer, "sad%d_channels\t\t%d\n", i, a->channels); 463 464 hdmi_print_pcm_rates(a->rates, buf, sizeof(buf)); 465 snd_iprintf(buffer, "sad%d_rates\t\t[0x%x]%s\n", i, a->rates, buf); 466 467 if (a->format == AUDIO_CODING_TYPE_LPCM) { 468 snd_print_pcm_bits(a->sample_bits, buf, sizeof(buf)); 469 snd_iprintf(buffer, "sad%d_bits\t\t[0x%x]%s\n", 470 i, a->sample_bits, buf); 471 } 472 473 if (a->max_bitrate) 474 snd_iprintf(buffer, "sad%d_max_bitrate\t%d\n", 475 i, a->max_bitrate); 476 477 if (a->profile) 478 snd_iprintf(buffer, "sad%d_profile\t\t%d\n", i, a->profile); 479 } 480 481 static void hdmi_print_eld_info(struct snd_info_entry *entry, 482 struct snd_info_buffer *buffer) 483 { 484 struct hdmi_eld *eld = entry->private_data; 485 struct parsed_hdmi_eld *e = &eld->info; 486 char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE]; 487 int i; 488 static char *eld_version_names[32] = { 489 "reserved", 490 "reserved", 491 "CEA-861D or below", 492 [3 ... 30] = "reserved", 493 [31] = "partial" 494 }; 495 static char *cea_edid_version_names[8] = { 496 "no CEA EDID Timing Extension block present", 497 "CEA-861", 498 "CEA-861-A", 499 "CEA-861-B, C or D", 500 [4 ... 7] = "reserved" 501 }; 502 503 mutex_lock(&eld->lock); 504 snd_iprintf(buffer, "monitor_present\t\t%d\n", eld->monitor_present); 505 snd_iprintf(buffer, "eld_valid\t\t%d\n", eld->eld_valid); 506 if (!eld->eld_valid) { 507 mutex_unlock(&eld->lock); 508 return; 509 } 510 snd_iprintf(buffer, "monitor_name\t\t%s\n", e->monitor_name); 511 snd_iprintf(buffer, "connection_type\t\t%s\n", 512 eld_connection_type_names[e->conn_type]); 513 snd_iprintf(buffer, "eld_version\t\t[0x%x] %s\n", e->eld_ver, 514 eld_version_names[e->eld_ver]); 515 snd_iprintf(buffer, "edid_version\t\t[0x%x] %s\n", e->cea_edid_ver, 516 cea_edid_version_names[e->cea_edid_ver]); 517 snd_iprintf(buffer, "manufacture_id\t\t0x%x\n", e->manufacture_id); 518 snd_iprintf(buffer, "product_id\t\t0x%x\n", e->product_id); 519 snd_iprintf(buffer, "port_id\t\t\t0x%llx\n", (long long)e->port_id); 520 snd_iprintf(buffer, "support_hdcp\t\t%d\n", e->support_hdcp); 521 snd_iprintf(buffer, "support_ai\t\t%d\n", e->support_ai); 522 snd_iprintf(buffer, "audio_sync_delay\t%d\n", e->aud_synch_delay); 523 524 snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf)); 525 snd_iprintf(buffer, "speakers\t\t[0x%x]%s\n", e->spk_alloc, buf); 526 527 snd_iprintf(buffer, "sad_count\t\t%d\n", e->sad_count); 528 529 for (i = 0; i < e->sad_count; i++) 530 hdmi_print_sad_info(i, e->sad + i, buffer); 531 mutex_unlock(&eld->lock); 532 } 533 534 static void hdmi_write_eld_info(struct snd_info_entry *entry, 535 struct snd_info_buffer *buffer) 536 { 537 struct hdmi_eld *eld = entry->private_data; 538 struct parsed_hdmi_eld *e = &eld->info; 539 char line[64]; 540 char name[64]; 541 char *sname; 542 long long val; 543 unsigned int n; 544 545 mutex_lock(&eld->lock); 546 while (!snd_info_get_line(buffer, line, sizeof(line))) { 547 if (sscanf(line, "%s %llx", name, &val) != 2) 548 continue; 549 /* 550 * We don't allow modification to these fields: 551 * monitor_name manufacture_id product_id 552 * eld_version edid_version 553 */ 554 if (!strcmp(name, "monitor_present")) 555 eld->monitor_present = val; 556 else if (!strcmp(name, "eld_valid")) 557 eld->eld_valid = val; 558 else if (!strcmp(name, "connection_type")) 559 e->conn_type = val; 560 else if (!strcmp(name, "port_id")) 561 e->port_id = val; 562 else if (!strcmp(name, "support_hdcp")) 563 e->support_hdcp = val; 564 else if (!strcmp(name, "support_ai")) 565 e->support_ai = val; 566 else if (!strcmp(name, "audio_sync_delay")) 567 e->aud_synch_delay = val; 568 else if (!strcmp(name, "speakers")) 569 e->spk_alloc = val; 570 else if (!strcmp(name, "sad_count")) 571 e->sad_count = val; 572 else if (!strncmp(name, "sad", 3)) { 573 sname = name + 4; 574 n = name[3] - '0'; 575 if (name[4] >= '0' && name[4] <= '9') { 576 sname++; 577 n = 10 * n + name[4] - '0'; 578 } 579 if (n >= ELD_MAX_SAD) 580 continue; 581 if (!strcmp(sname, "_coding_type")) 582 e->sad[n].format = val; 583 else if (!strcmp(sname, "_channels")) 584 e->sad[n].channels = val; 585 else if (!strcmp(sname, "_rates")) 586 e->sad[n].rates = val; 587 else if (!strcmp(sname, "_bits")) 588 e->sad[n].sample_bits = val; 589 else if (!strcmp(sname, "_max_bitrate")) 590 e->sad[n].max_bitrate = val; 591 else if (!strcmp(sname, "_profile")) 592 e->sad[n].profile = val; 593 if (n >= e->sad_count) 594 e->sad_count = n + 1; 595 } 596 } 597 mutex_unlock(&eld->lock); 598 } 599 600 601 int snd_hda_eld_proc_new(struct hda_codec *codec, struct hdmi_eld *eld, 602 int index) 603 { 604 char name[32]; 605 struct snd_info_entry *entry; 606 int err; 607 608 snprintf(name, sizeof(name), "eld#%d.%d", codec->addr, index); 609 err = snd_card_proc_new(codec->bus->card, name, &entry); 610 if (err < 0) 611 return err; 612 613 snd_info_set_text_ops(entry, eld, hdmi_print_eld_info); 614 entry->c.text.write = hdmi_write_eld_info; 615 entry->mode |= S_IWUSR; 616 eld->proc_entry = entry; 617 618 return 0; 619 } 620 621 void snd_hda_eld_proc_free(struct hda_codec *codec, struct hdmi_eld *eld) 622 { 623 if (!codec->bus->shutdown && eld->proc_entry) { 624 snd_device_free(codec->bus->card, eld->proc_entry); 625 eld->proc_entry = NULL; 626 } 627 } 628 629 #endif /* CONFIG_PROC_FS */ 630 631 /* update PCM info based on ELD */ 632 void snd_hdmi_eld_update_pcm_info(struct parsed_hdmi_eld *e, 633 struct hda_pcm_stream *hinfo) 634 { 635 u32 rates; 636 u64 formats; 637 unsigned int maxbps; 638 unsigned int channels_max; 639 int i; 640 641 /* assume basic audio support (the basic audio flag is not in ELD; 642 * however, all audio capable sinks are required to support basic 643 * audio) */ 644 rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | 645 SNDRV_PCM_RATE_48000; 646 formats = SNDRV_PCM_FMTBIT_S16_LE; 647 maxbps = 16; 648 channels_max = 2; 649 for (i = 0; i < e->sad_count; i++) { 650 struct cea_sad *a = &e->sad[i]; 651 rates |= a->rates; 652 if (a->channels > channels_max) 653 channels_max = a->channels; 654 if (a->format == AUDIO_CODING_TYPE_LPCM) { 655 if (a->sample_bits & AC_SUPPCM_BITS_20) { 656 formats |= SNDRV_PCM_FMTBIT_S32_LE; 657 if (maxbps < 20) 658 maxbps = 20; 659 } 660 if (a->sample_bits & AC_SUPPCM_BITS_24) { 661 formats |= SNDRV_PCM_FMTBIT_S32_LE; 662 if (maxbps < 24) 663 maxbps = 24; 664 } 665 } 666 } 667 668 /* restrict the parameters by the values the codec provides */ 669 hinfo->rates &= rates; 670 hinfo->formats &= formats; 671 hinfo->maxbps = min(hinfo->maxbps, maxbps); 672 hinfo->channels_max = min(hinfo->channels_max, channels_max); 673 } 674