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_eld_valid(struct hda_codec *codec, hda_nid_t nid) 313 { 314 int eldv; 315 int present; 316 317 present = snd_hda_pin_sense(codec, nid); 318 eldv = (present & AC_PINSENSE_ELDV); 319 present = (present & AC_PINSENSE_PRESENCE); 320 321 #ifdef CONFIG_SND_DEBUG_VERBOSE 322 printk(KERN_INFO "HDMI: sink_present = %d, eld_valid = %d\n", 323 !!present, !!eldv); 324 #endif 325 326 return eldv && present; 327 } 328 329 int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid) 330 { 331 return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_SIZE, 332 AC_DIPSIZE_ELD_BUF); 333 } 334 335 int snd_hdmi_get_eld(struct hdmi_eld *eld, 336 struct hda_codec *codec, hda_nid_t nid) 337 { 338 int i; 339 int ret; 340 int size; 341 unsigned char *buf; 342 343 if (!hdmi_eld_valid(codec, nid)) 344 return -ENOENT; 345 346 size = snd_hdmi_get_eld_size(codec, nid); 347 if (size == 0) { 348 /* wfg: workaround for ASUS P5E-VM HDMI board */ 349 snd_printd(KERN_INFO "HDMI: ELD buf size is 0, force 128\n"); 350 size = 128; 351 } 352 if (size < ELD_FIXED_BYTES || size > PAGE_SIZE) { 353 snd_printd(KERN_INFO "HDMI: invalid ELD buf size %d\n", size); 354 return -ERANGE; 355 } 356 357 buf = kmalloc(size, GFP_KERNEL); 358 if (!buf) 359 return -ENOMEM; 360 361 for (i = 0; i < size; i++) 362 buf[i] = hdmi_get_eld_byte(codec, nid, i); 363 364 ret = hdmi_update_eld(eld, buf, size); 365 366 kfree(buf); 367 return ret; 368 } 369 370 static void hdmi_show_short_audio_desc(struct cea_sad *a) 371 { 372 char buf[SND_PRINT_RATES_ADVISED_BUFSIZE]; 373 char buf2[8 + SND_PRINT_BITS_ADVISED_BUFSIZE] = ", bits ="; 374 375 if (!a->format) 376 return; 377 378 snd_print_pcm_rates(a->rates, buf, sizeof(buf)); 379 380 if (a->format == AUDIO_CODING_TYPE_LPCM) 381 snd_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2 - 8)); 382 else if (a->max_bitrate) 383 snprintf(buf2, sizeof(buf2), 384 ", max bitrate = %d", a->max_bitrate); 385 else 386 buf2[0] = '\0'; 387 388 printk(KERN_INFO "HDMI: supports coding type %s:" 389 " channels = %d, rates =%s%s\n", 390 cea_audio_coding_type_names[a->format], 391 a->channels, 392 buf, 393 buf2); 394 } 395 396 void snd_print_channel_allocation(int spk_alloc, char *buf, int buflen) 397 { 398 int i, j; 399 400 for (i = 0, j = 0; i < ARRAY_SIZE(cea_speaker_allocation_names); i++) { 401 if (spk_alloc & (1 << i)) 402 j += snprintf(buf + j, buflen - j, " %s", 403 cea_speaker_allocation_names[i]); 404 } 405 buf[j] = '\0'; /* necessary when j == 0 */ 406 } 407 408 void snd_hdmi_show_eld(struct hdmi_eld *e) 409 { 410 int i; 411 412 printk(KERN_INFO "HDMI: detected monitor %s at connection type %s\n", 413 e->monitor_name, 414 eld_connection_type_names[e->conn_type]); 415 416 if (e->spk_alloc) { 417 char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE]; 418 snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf)); 419 printk(KERN_INFO "HDMI: available speakers:%s\n", buf); 420 } 421 422 for (i = 0; i < e->sad_count; i++) 423 hdmi_show_short_audio_desc(e->sad + i); 424 } 425 426 #ifdef CONFIG_PROC_FS 427 428 static void hdmi_print_sad_info(int i, struct cea_sad *a, 429 struct snd_info_buffer *buffer) 430 { 431 char buf[SND_PRINT_RATES_ADVISED_BUFSIZE]; 432 433 snd_iprintf(buffer, "sad%d_coding_type\t[0x%x] %s\n", 434 i, a->format, cea_audio_coding_type_names[a->format]); 435 snd_iprintf(buffer, "sad%d_channels\t\t%d\n", i, a->channels); 436 437 snd_print_pcm_rates(a->rates, buf, sizeof(buf)); 438 snd_iprintf(buffer, "sad%d_rates\t\t[0x%x]%s\n", i, a->rates, buf); 439 440 if (a->format == AUDIO_CODING_TYPE_LPCM) { 441 snd_print_pcm_bits(a->sample_bits, buf, sizeof(buf)); 442 snd_iprintf(buffer, "sad%d_bits\t\t[0x%x]%s\n", 443 i, a->sample_bits, buf); 444 } 445 446 if (a->max_bitrate) 447 snd_iprintf(buffer, "sad%d_max_bitrate\t%d\n", 448 i, a->max_bitrate); 449 450 if (a->profile) 451 snd_iprintf(buffer, "sad%d_profile\t\t%d\n", i, a->profile); 452 } 453 454 static void hdmi_print_eld_info(struct snd_info_entry *entry, 455 struct snd_info_buffer *buffer) 456 { 457 struct hdmi_eld *e = entry->private_data; 458 char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE]; 459 int i; 460 static char *eld_versoin_names[32] = { 461 "reserved", 462 "reserved", 463 "CEA-861D or below", 464 [3 ... 30] = "reserved", 465 [31] = "partial" 466 }; 467 static char *cea_edid_version_names[8] = { 468 "no CEA EDID Timing Extension block present", 469 "CEA-861", 470 "CEA-861-A", 471 "CEA-861-B, C or D", 472 [4 ... 7] = "reserved" 473 }; 474 475 snd_iprintf(buffer, "monitor_present\t\t%d\n", e->monitor_present); 476 snd_iprintf(buffer, "eld_valid\t\t%d\n", e->eld_valid); 477 snd_iprintf(buffer, "monitor_name\t\t%s\n", e->monitor_name); 478 snd_iprintf(buffer, "connection_type\t\t%s\n", 479 eld_connection_type_names[e->conn_type]); 480 snd_iprintf(buffer, "eld_version\t\t[0x%x] %s\n", e->eld_ver, 481 eld_versoin_names[e->eld_ver]); 482 snd_iprintf(buffer, "edid_version\t\t[0x%x] %s\n", e->cea_edid_ver, 483 cea_edid_version_names[e->cea_edid_ver]); 484 snd_iprintf(buffer, "manufacture_id\t\t0x%x\n", e->manufacture_id); 485 snd_iprintf(buffer, "product_id\t\t0x%x\n", e->product_id); 486 snd_iprintf(buffer, "port_id\t\t\t0x%llx\n", (long long)e->port_id); 487 snd_iprintf(buffer, "support_hdcp\t\t%d\n", e->support_hdcp); 488 snd_iprintf(buffer, "support_ai\t\t%d\n", e->support_ai); 489 snd_iprintf(buffer, "audio_sync_delay\t%d\n", e->aud_synch_delay); 490 491 snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf)); 492 snd_iprintf(buffer, "speakers\t\t[0x%x]%s\n", e->spk_alloc, buf); 493 494 snd_iprintf(buffer, "sad_count\t\t%d\n", e->sad_count); 495 496 for (i = 0; i < e->sad_count; i++) 497 hdmi_print_sad_info(i, e->sad + i, buffer); 498 } 499 500 static void hdmi_write_eld_info(struct snd_info_entry *entry, 501 struct snd_info_buffer *buffer) 502 { 503 struct hdmi_eld *e = entry->private_data; 504 char line[64]; 505 char name[64]; 506 char *sname; 507 long long val; 508 unsigned int n; 509 510 while (!snd_info_get_line(buffer, line, sizeof(line))) { 511 if (sscanf(line, "%s %llx", name, &val) != 2) 512 continue; 513 /* 514 * We don't allow modification to these fields: 515 * monitor_name manufacture_id product_id 516 * eld_version edid_version 517 */ 518 if (!strcmp(name, "monitor_present")) 519 e->monitor_present = val; 520 else if (!strcmp(name, "eld_valid")) 521 e->eld_valid = val; 522 else if (!strcmp(name, "connection_type")) 523 e->conn_type = val; 524 else if (!strcmp(name, "port_id")) 525 e->port_id = val; 526 else if (!strcmp(name, "support_hdcp")) 527 e->support_hdcp = val; 528 else if (!strcmp(name, "support_ai")) 529 e->support_ai = val; 530 else if (!strcmp(name, "audio_sync_delay")) 531 e->aud_synch_delay = val; 532 else if (!strcmp(name, "speakers")) 533 e->spk_alloc = val; 534 else if (!strcmp(name, "sad_count")) 535 e->sad_count = val; 536 else if (!strncmp(name, "sad", 3)) { 537 sname = name + 4; 538 n = name[3] - '0'; 539 if (name[4] >= '0' && name[4] <= '9') { 540 sname++; 541 n = 10 * n + name[4] - '0'; 542 } 543 if (n >= ELD_MAX_SAD) 544 continue; 545 if (!strcmp(sname, "_coding_type")) 546 e->sad[n].format = val; 547 else if (!strcmp(sname, "_channels")) 548 e->sad[n].channels = val; 549 else if (!strcmp(sname, "_rates")) 550 e->sad[n].rates = val; 551 else if (!strcmp(sname, "_bits")) 552 e->sad[n].sample_bits = val; 553 else if (!strcmp(sname, "_max_bitrate")) 554 e->sad[n].max_bitrate = val; 555 else if (!strcmp(sname, "_profile")) 556 e->sad[n].profile = val; 557 if (n >= e->sad_count) 558 e->sad_count = n + 1; 559 } 560 } 561 } 562 563 564 int snd_hda_eld_proc_new(struct hda_codec *codec, struct hdmi_eld *eld, 565 int index) 566 { 567 char name[32]; 568 struct snd_info_entry *entry; 569 int err; 570 571 snprintf(name, sizeof(name), "eld#%d.%d", codec->addr, index); 572 err = snd_card_proc_new(codec->bus->card, name, &entry); 573 if (err < 0) 574 return err; 575 576 snd_info_set_text_ops(entry, eld, hdmi_print_eld_info); 577 entry->c.text.write = hdmi_write_eld_info; 578 entry->mode |= S_IWUSR; 579 eld->proc_entry = entry; 580 581 return 0; 582 } 583 584 void snd_hda_eld_proc_free(struct hda_codec *codec, struct hdmi_eld *eld) 585 { 586 if (!codec->bus->shutdown && eld->proc_entry) { 587 snd_device_free(codec->bus->card, eld->proc_entry); 588 eld->proc_entry = NULL; 589 } 590 } 591 592 #endif /* CONFIG_PROC_FS */ 593