sys/dev/drm/linux_hdmi.c

   1 /*
   2  * Copyright (C) 2012 Avionic Design GmbH
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sub license,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the
  12  * next paragraph) shall be included in all copies or substantial portions
  13  * of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 #include <linux/bitops.h>
  25 #include <linux/bug.h>
  26 #include <linux/errno.h>
  27 #include <linux/export.h>
  28 #include <linux/hdmi.h>
  29 #include <linux/device.h>
  30 #include <linux/kernel.h>
  31
  32 #define hdmi_log(fmt, ...) dev_printk(level, dev, fmt, ##__VA_ARGS__)
  33
  34 static u8 hdmi_infoframe_checksum(u8 *ptr, size_t size)
  35 {
  36         u8 csum = 0;
  37         size_t i;
  38
  39         /* compute checksum */
  40         for (i = 0; i < size; i++)
  41                 csum += ptr[i];
  42
  43         return 256 - csum;
  44 }
  45
  46 static void hdmi_infoframe_set_checksum(void *buffer, size_t size)
  47 {
  48         u8 *ptr = buffer;
  49
  50         ptr[3] = hdmi_infoframe_checksum(buffer, size);
  51 }
  52
  53 /**
  54  * hdmi_avi_infoframe_init() - initialize an HDMI AVI infoframe
  55  * @frame: HDMI AVI infoframe
  56  *
  57  * Returns 0 on success or a negative error code on failure.
  58  */
  59 int hdmi_avi_infoframe_init(struct hdmi_avi_infoframe *frame)
  60 {
  61         memset(frame, 0, sizeof(*frame));
  62
  63         frame->type = HDMI_INFOFRAME_TYPE_AVI;
  64         frame->version = 2;
  65         frame->length = HDMI_AVI_INFOFRAME_SIZE;
  66
  67         return 0;
  68 }
  69 EXPORT_SYMBOL(hdmi_avi_infoframe_init);
  70
  71 /**
  72  * hdmi_avi_infoframe_pack() - write HDMI AVI infoframe to binary buffer
  73  * @frame: HDMI AVI infoframe
  74  * @buffer: destination buffer
  75  * @size: size of buffer
  76  *
  77  * Packs the information contained in the @frame structure into a binary
  78  * representation that can be written into the corresponding controller
  79  * registers. Also computes the checksum as required by section 5.3.5 of
  80  * the HDMI 1.4 specification.
  81  *
  82  * Returns the number of bytes packed into the binary buffer or a negative
  83  * error code on failure.
  84  */
  85 ssize_t hdmi_avi_infoframe_pack(struct hdmi_avi_infoframe *frame, void *buffer,
  86                                 size_t size)
  87 {
  88         u8 *ptr = buffer;
  89         size_t length;
  90
  91         length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
  92
  93         if (size < length)
  94                 return -ENOSPC;
  95
  96         memset(buffer, 0, size);
  97
  98         ptr[0] = frame->type;
  99         ptr[1] = frame->version;
 100         ptr[2] = frame->length;
 101         ptr[3] = 0; /* checksum */
 102
 103         /* start infoframe payload */
 104         ptr += HDMI_INFOFRAME_HEADER_SIZE;
 105
 106         ptr[0] = ((frame->colorspace & 0x3) << 5) | (frame->scan_mode & 0x3);
 107
 108         /*
 109          * Data byte 1, bit 4 has to be set if we provide the active format
 110          * aspect ratio
 111          */
 112         if (frame->active_aspect & 0xf)
 113                 ptr[0] |= BIT(4);
 114
 115         /* Bit 3 and 2 indicate if we transmit horizontal/vertical bar data */
 116         if (frame->top_bar || frame->bottom_bar)
 117                 ptr[0] |= BIT(3);
 118
 119         if (frame->left_bar || frame->right_bar)
 120                 ptr[0] |= BIT(2);
 121
 122         ptr[1] = ((frame->colorimetry & 0x3) << 6) |
 123                  ((frame->picture_aspect & 0x3) << 4) |
 124                  (frame->active_aspect & 0xf);
 125
 126         ptr[2] = ((frame->extended_colorimetry & 0x7) << 4) |
 127                  ((frame->quantization_range & 0x3) << 2) |
 128                  (frame->nups & 0x3);
 129
 130         if (frame->itc)
 131                 ptr[2] |= BIT(7);
 132
 133         ptr[3] = frame->video_code & 0x7f;
 134
 135         ptr[4] = ((frame->ycc_quantization_range & 0x3) << 6) |
 136                  ((frame->content_type & 0x3) << 4) |
 137                  (frame->pixel_repeat & 0xf);
 138
 139         ptr[5] = frame->top_bar & 0xff;
 140         ptr[6] = (frame->top_bar >> 8) & 0xff;
 141         ptr[7] = frame->bottom_bar & 0xff;
 142         ptr[8] = (frame->bottom_bar >> 8) & 0xff;
 143         ptr[9] = frame->left_bar & 0xff;
 144         ptr[10] = (frame->left_bar >> 8) & 0xff;
 145         ptr[11] = frame->right_bar & 0xff;
 146         ptr[12] = (frame->right_bar >> 8) & 0xff;
 147
 148         hdmi_infoframe_set_checksum(buffer, length);
 149
 150         return length;
 151 }
 152 EXPORT_SYMBOL(hdmi_avi_infoframe_pack);
 153
 154 /**
 155  * hdmi_spd_infoframe_init() - initialize an HDMI SPD infoframe
 156  * @frame: HDMI SPD infoframe
 157  * @vendor: vendor string
 158  * @product: product string
 159  *
 160  * Returns 0 on success or a negative error code on failure.
 161  */
 162 int hdmi_spd_infoframe_init(struct hdmi_spd_infoframe *frame,
 163                             const char *vendor, const char *product)
 164 {
 165         memset(frame, 0, sizeof(*frame));
 166
 167         frame->type = HDMI_INFOFRAME_TYPE_SPD;
 168         frame->version = 1;
 169         frame->length = HDMI_SPD_INFOFRAME_SIZE;
 170
 171         strncpy(frame->vendor, vendor, sizeof(frame->vendor));
 172         strncpy(frame->product, product, sizeof(frame->product));
 173
 174         return 0;
 175 }
 176 EXPORT_SYMBOL(hdmi_spd_infoframe_init);
 177
 178 /**
 179  * hdmi_spd_infoframe_pack() - write HDMI SPD infoframe to binary buffer
 180  * @frame: HDMI SPD infoframe
 181  * @buffer: destination buffer
 182  * @size: size of buffer
 183  *
 184  * Packs the information contained in the @frame structure into a binary
 185  * representation that can be written into the corresponding controller
 186  * registers. Also computes the checksum as required by section 5.3.5 of
 187  * the HDMI 1.4 specification.
 188  *
 189  * Returns the number of bytes packed into the binary buffer or a negative
 190  * error code on failure.
 191  */
 192 ssize_t hdmi_spd_infoframe_pack(struct hdmi_spd_infoframe *frame, void *buffer,
 193                                 size_t size)
 194 {
 195         u8 *ptr = buffer;
 196         size_t length;
 197
 198         length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
 199
 200         if (size < length)
 201                 return -ENOSPC;
 202
 203         memset(buffer, 0, size);
 204
 205         ptr[0] = frame->type;
 206         ptr[1] = frame->version;
 207         ptr[2] = frame->length;
 208         ptr[3] = 0; /* checksum */
 209
 210         /* start infoframe payload */
 211         ptr += HDMI_INFOFRAME_HEADER_SIZE;
 212
 213         memcpy(ptr, frame->vendor, sizeof(frame->vendor));
 214         memcpy(ptr + 8, frame->product, sizeof(frame->product));
 215
 216         ptr[24] = frame->sdi;
 217
 218         hdmi_infoframe_set_checksum(buffer, length);
 219
 220         return length;
 221 }
 222 EXPORT_SYMBOL(hdmi_spd_infoframe_pack);
 223
 224 /**
 225  * hdmi_audio_infoframe_init() - initialize an HDMI audio infoframe
 226  * @frame: HDMI audio infoframe
 227  *
 228  * Returns 0 on success or a negative error code on failure.
 229  */
 230 int hdmi_audio_infoframe_init(struct hdmi_audio_infoframe *frame)
 231 {
 232         memset(frame, 0, sizeof(*frame));
 233
 234         frame->type = HDMI_INFOFRAME_TYPE_AUDIO;
 235         frame->version = 1;
 236         frame->length = HDMI_AUDIO_INFOFRAME_SIZE;
 237
 238         return 0;
 239 }
 240 EXPORT_SYMBOL(hdmi_audio_infoframe_init);
 241
 242 /**
 243  * hdmi_audio_infoframe_pack() - write HDMI audio infoframe to binary buffer
 244  * @frame: HDMI audio infoframe
 245  * @buffer: destination buffer
 246  * @size: size of buffer
 247  *
 248  * Packs the information contained in the @frame structure into a binary
 249  * representation that can be written into the corresponding controller
 250  * registers. Also computes the checksum as required by section 5.3.5 of
 251  * the HDMI 1.4 specification.
 252  *
 253  * Returns the number of bytes packed into the binary buffer or a negative
 254  * error code on failure.
 255  */
 256 ssize_t hdmi_audio_infoframe_pack(struct hdmi_audio_infoframe *frame,
 257                                   void *buffer, size_t size)
 258 {
 259         unsigned char channels;
 260         u8 *ptr = buffer;
 261         size_t length;
 262
 263         length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
 264
 265         if (size < length)
 266                 return -ENOSPC;
 267
 268         memset(buffer, 0, size);
 269
 270         if (frame->channels >= 2)
 271                 channels = frame->channels - 1;
 272         else
 273                 channels = 0;
 274
 275         ptr[0] = frame->type;
 276         ptr[1] = frame->version;
 277         ptr[2] = frame->length;
 278         ptr[3] = 0; /* checksum */
 279
 280         /* start infoframe payload */
 281         ptr += HDMI_INFOFRAME_HEADER_SIZE;
 282
 283         ptr[0] = ((frame->coding_type & 0xf) << 4) | (channels & 0x7);
 284         ptr[1] = ((frame->sample_frequency & 0x7) << 2) |
 285                  (frame->sample_size & 0x3);
 286         ptr[2] = frame->coding_type_ext & 0x1f;
 287         ptr[3] = frame->channel_allocation;
 288         ptr[4] = (frame->level_shift_value & 0xf) << 3;
 289
 290         if (frame->downmix_inhibit)
 291                 ptr[4] |= BIT(7);
 292
 293         hdmi_infoframe_set_checksum(buffer, length);
 294
 295         return length;
 296 }
 297 EXPORT_SYMBOL(hdmi_audio_infoframe_pack);
 298
 299 /**
 300  * hdmi_vendor_infoframe_init() - initialize an HDMI vendor infoframe
 301  * @frame: HDMI vendor infoframe
 302  *
 303  * Returns 0 on success or a negative error code on failure.
 304  */
 305 int hdmi_vendor_infoframe_init(struct hdmi_vendor_infoframe *frame)
 306 {
 307         memset(frame, 0, sizeof(*frame));
 308
 309         frame->type = HDMI_INFOFRAME_TYPE_VENDOR;
 310         frame->version = 1;
 311
 312         frame->oui = HDMI_IEEE_OUI;
 313
 314         /*
 315          * 0 is a valid value for s3d_struct, so we use a special "not set"
 316          * value
 317          */
 318         frame->s3d_struct = HDMI_3D_STRUCTURE_INVALID;
 319
 320         return 0;
 321 }
 322 EXPORT_SYMBOL(hdmi_vendor_infoframe_init);
 323
 324 /**
 325  * hdmi_vendor_infoframe_pack() - write a HDMI vendor infoframe to binary buffer
 326  * @frame: HDMI infoframe
 327  * @buffer: destination buffer
 328  * @size: size of buffer
 329  *
 330  * Packs the information contained in the @frame structure into a binary
 331  * representation that can be written into the corresponding controller
 332  * registers. Also computes the checksum as required by section 5.3.5 of
 333  * the HDMI 1.4 specification.
 334  *
 335  * Returns the number of bytes packed into the binary buffer or a negative
 336  * error code on failure.
 337  */
 338 ssize_t hdmi_vendor_infoframe_pack(struct hdmi_vendor_infoframe *frame,
 339                                  void *buffer, size_t size)
 340 {
 341         u8 *ptr = buffer;
 342         size_t length;
 343
 344         /* empty info frame */
 345         if (frame->vic == 0 && frame->s3d_struct == HDMI_3D_STRUCTURE_INVALID)
 346                 return -EINVAL;
 347
 348         /* only one of those can be supplied */
 349         if (frame->vic != 0 && frame->s3d_struct != HDMI_3D_STRUCTURE_INVALID)
 350                 return -EINVAL;
 351
 352         /* for side by side (half) we also need to provide 3D_Ext_Data */
 353         if (frame->s3d_struct >= HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF)
 354                 frame->length = 6;
 355         else
 356                 frame->length = 5;
 357
 358         length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
 359
 360         if (size < length)
 361                 return -ENOSPC;
 362
 363         memset(buffer, 0, size);
 364
 365         ptr[0] = frame->type;
 366         ptr[1] = frame->version;
 367         ptr[2] = frame->length;
 368         ptr[3] = 0; /* checksum */
 369
 370         /* HDMI OUI */
 371         ptr[4] = 0x03;
 372         ptr[5] = 0x0c;
 373         ptr[6] = 0x00;
 374
 375         if (frame->vic) {
 376                 ptr[7] = 0x1 << 5;      /* video format */
 377                 ptr[8] = frame->vic;
 378         } else {
 379                 ptr[7] = 0x2 << 5;      /* video format */
 380                 ptr[8] = (frame->s3d_struct & 0xf) << 4;
 381                 if (frame->s3d_struct >= HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF)
 382                         ptr[9] = (frame->s3d_ext_data & 0xf) << 4;
 383         }
 384
 385         hdmi_infoframe_set_checksum(buffer, length);
 386
 387         return length;
 388 }
 389 EXPORT_SYMBOL(hdmi_vendor_infoframe_pack);
 390
 391 /*
 392  * hdmi_vendor_any_infoframe_pack() - write a vendor infoframe to binary buffer
 393  */
 394 static ssize_t
 395 hdmi_vendor_any_infoframe_pack(union hdmi_vendor_any_infoframe *frame,
 396                            void *buffer, size_t size)
 397 {
 398         /* we only know about HDMI vendor infoframes */
 399         if (frame->any.oui != HDMI_IEEE_OUI)
 400                 return -EINVAL;
 401
 402         return hdmi_vendor_infoframe_pack(&frame->hdmi, buffer, size);
 403 }
 404
 405 /**
 406  * hdmi_infoframe_pack() - write a HDMI infoframe to binary buffer
 407  * @frame: HDMI infoframe
 408  * @buffer: destination buffer
 409  * @size: size of buffer
 410  *
 411  * Packs the information contained in the @frame structure into a binary
 412  * representation that can be written into the corresponding controller
 413  * registers. Also computes the checksum as required by section 5.3.5 of
 414  * the HDMI 1.4 specification.
 415  *
 416  * Returns the number of bytes packed into the binary buffer or a negative
 417  * error code on failure.
 418  */
 419 ssize_t
 420 hdmi_infoframe_pack(union hdmi_infoframe *frame, void *buffer, size_t size)
 421 {
 422         ssize_t length;
 423
 424         switch (frame->any.type) {
 425         case HDMI_INFOFRAME_TYPE_AVI:
 426                 length = hdmi_avi_infoframe_pack(&frame->avi, buffer, size);
 427                 break;
 428         case HDMI_INFOFRAME_TYPE_SPD:
 429                 length = hdmi_spd_infoframe_pack(&frame->spd, buffer, size);
 430                 break;
 431         case HDMI_INFOFRAME_TYPE_AUDIO:
 432                 length = hdmi_audio_infoframe_pack(&frame->audio, buffer, size);
 433                 break;
 434         case HDMI_INFOFRAME_TYPE_VENDOR:
 435                 length = hdmi_vendor_any_infoframe_pack(&frame->vendor,
 436                                                         buffer, size);
 437                 break;
 438         default:
 439                 WARN(1, "Bad infoframe type %d\n", frame->any.type);
 440                 length = -EINVAL;
 441         }
 442
 443         return length;
 444 }
 445 EXPORT_SYMBOL(hdmi_infoframe_pack);
 446
 447 static const char *hdmi_infoframe_type_get_name(enum hdmi_infoframe_type type)
 448 {
 449         if (type < 0x80 || type > 0x9f)
 450                 return "Invalid";
 451         switch (type) {
 452         case HDMI_INFOFRAME_TYPE_VENDOR:
 453                 return "Vendor";
 454         case HDMI_INFOFRAME_TYPE_AVI:
 455                 return "Auxiliary Video Information (AVI)";
 456         case HDMI_INFOFRAME_TYPE_SPD:
 457                 return "Source Product Description (SPD)";
 458         case HDMI_INFOFRAME_TYPE_AUDIO:
 459                 return "Audio";
 460         }
 461         return "Reserved";
 462 }
 463
 464 static void hdmi_infoframe_log_header(const char *level,
 465                                       struct device *dev,
 466                                       struct hdmi_any_infoframe *frame)
 467 {
 468         hdmi_log("HDMI infoframe: %s, version %u, length %u\n",
 469                 hdmi_infoframe_type_get_name(frame->type),
 470                 frame->version, frame->length);
 471 }
 472
 473 static const char *hdmi_colorspace_get_name(enum hdmi_colorspace colorspace)
 474 {
 475         switch (colorspace) {
 476         case HDMI_COLORSPACE_RGB:
 477                 return "RGB";
 478         case HDMI_COLORSPACE_YUV422:
 479                 return "YCbCr 4:2:2";
 480         case HDMI_COLORSPACE_YUV444:
 481                 return "YCbCr 4:4:4";
 482         case HDMI_COLORSPACE_YUV420:
 483                 return "YCbCr 4:2:0";
 484         case HDMI_COLORSPACE_RESERVED4:
 485                 return "Reserved (4)";
 486         case HDMI_COLORSPACE_RESERVED5:
 487                 return "Reserved (5)";
 488         case HDMI_COLORSPACE_RESERVED6:
 489                 return "Reserved (6)";
 490         case HDMI_COLORSPACE_IDO_DEFINED:
 491                 return "IDO Defined";
 492         }
 493         return "Invalid";
 494 }
 495
 496 static const char *hdmi_scan_mode_get_name(enum hdmi_scan_mode scan_mode)
 497 {
 498         switch (scan_mode) {
 499         case HDMI_SCAN_MODE_NONE:
 500                 return "No Data";
 501         case HDMI_SCAN_MODE_OVERSCAN:
 502                 return "Overscan";
 503         case HDMI_SCAN_MODE_UNDERSCAN:
 504                 return "Underscan";
 505         case HDMI_SCAN_MODE_RESERVED:
 506                 return "Reserved";
 507         }
 508         return "Invalid";
 509 }
 510
 511 static const char *hdmi_colorimetry_get_name(enum hdmi_colorimetry colorimetry)
 512 {
 513         switch (colorimetry) {
 514         case HDMI_COLORIMETRY_NONE:
 515                 return "No Data";
 516         case HDMI_COLORIMETRY_ITU_601:
 517                 return "ITU601";
 518         case HDMI_COLORIMETRY_ITU_709:
 519                 return "ITU709";
 520         case HDMI_COLORIMETRY_EXTENDED:
 521                 return "Extended";
 522         }
 523         return "Invalid";
 524 }
 525
 526 static const char *
 527 hdmi_picture_aspect_get_name(enum hdmi_picture_aspect picture_aspect)
 528 {
 529         switch (picture_aspect) {
 530         case HDMI_PICTURE_ASPECT_NONE:
 531                 return "No Data";
 532         case HDMI_PICTURE_ASPECT_4_3:
 533                 return "4:3";
 534         case HDMI_PICTURE_ASPECT_16_9:
 535                 return "16:9";
 536         case HDMI_PICTURE_ASPECT_RESERVED:
 537                 return "Reserved";
 538         }
 539         return "Invalid";
 540 }
 541
 542 static const char *
 543 hdmi_active_aspect_get_name(enum hdmi_active_aspect active_aspect)
 544 {
 545         if (active_aspect < 0 || active_aspect > 0xf)
 546                 return "Invalid";
 547
 548         switch (active_aspect) {
 549         case HDMI_ACTIVE_ASPECT_16_9_TOP:
 550                 return "16:9 Top";
 551         case HDMI_ACTIVE_ASPECT_14_9_TOP:
 552                 return "14:9 Top";
 553         case HDMI_ACTIVE_ASPECT_16_9_CENTER:
 554                 return "16:9 Center";
 555         case HDMI_ACTIVE_ASPECT_PICTURE:
 556                 return "Same as Picture";
 557         case HDMI_ACTIVE_ASPECT_4_3:
 558                 return "4:3";
 559         case HDMI_ACTIVE_ASPECT_16_9:
 560                 return "16:9";
 561         case HDMI_ACTIVE_ASPECT_14_9:
 562                 return "14:9";
 563         case HDMI_ACTIVE_ASPECT_4_3_SP_14_9:
 564                 return "4:3 SP 14:9";
 565         case HDMI_ACTIVE_ASPECT_16_9_SP_14_9:
 566                 return "16:9 SP 14:9";
 567         case HDMI_ACTIVE_ASPECT_16_9_SP_4_3:
 568                 return "16:9 SP 4:3";
 569         }
 570         return "Reserved";
 571 }
 572
 573 static const char *
 574 hdmi_extended_colorimetry_get_name(enum hdmi_extended_colorimetry ext_col)
 575 {
 576         switch (ext_col) {
 577         case HDMI_EXTENDED_COLORIMETRY_XV_YCC_601:
 578                 return "xvYCC 601";
 579         case HDMI_EXTENDED_COLORIMETRY_XV_YCC_709:
 580                 return "xvYCC 709";
 581         case HDMI_EXTENDED_COLORIMETRY_S_YCC_601:
 582                 return "sYCC 601";
 583         case HDMI_EXTENDED_COLORIMETRY_ADOBE_YCC_601:
 584                 return "Adobe YCC 601";
 585         case HDMI_EXTENDED_COLORIMETRY_ADOBE_RGB:
 586                 return "Adobe RGB";
 587         case HDMI_EXTENDED_COLORIMETRY_BT2020_CONST_LUM:
 588                 return "BT.2020 Constant Luminance";
 589         case HDMI_EXTENDED_COLORIMETRY_BT2020:
 590                 return "BT.2020";
 591         case HDMI_EXTENDED_COLORIMETRY_RESERVED:
 592                 return "Reserved";
 593         }
 594         return "Invalid";
 595 }
 596
 597 static const char *
 598 hdmi_quantization_range_get_name(enum hdmi_quantization_range qrange)
 599 {
 600         switch (qrange) {
 601         case HDMI_QUANTIZATION_RANGE_DEFAULT:
 602                 return "Default";
 603         case HDMI_QUANTIZATION_RANGE_LIMITED:
 604                 return "Limited";
 605         case HDMI_QUANTIZATION_RANGE_FULL:
 606                 return "Full";
 607         case HDMI_QUANTIZATION_RANGE_RESERVED:
 608                 return "Reserved";
 609         }
 610         return "Invalid";
 611 }
 612
 613 static const char *hdmi_nups_get_name(enum hdmi_nups nups)
 614 {
 615         switch (nups) {
 616         case HDMI_NUPS_UNKNOWN:
 617                 return "Unknown Non-uniform Scaling";
 618         case HDMI_NUPS_HORIZONTAL:
 619                 return "Horizontally Scaled";
 620         case HDMI_NUPS_VERTICAL:
 621                 return "Vertically Scaled";
 622         case HDMI_NUPS_BOTH:
 623                 return "Horizontally and Vertically Scaled";
 624         }
 625         return "Invalid";
 626 }
 627
 628 static const char *
 629 hdmi_ycc_quantization_range_get_name(enum hdmi_ycc_quantization_range qrange)
 630 {
 631         switch (qrange) {
 632         case HDMI_YCC_QUANTIZATION_RANGE_LIMITED:
 633                 return "Limited";
 634         case HDMI_YCC_QUANTIZATION_RANGE_FULL:
 635                 return "Full";
 636         }
 637         return "Invalid";
 638 }
 639
 640 static const char *
 641 hdmi_content_type_get_name(enum hdmi_content_type content_type)
 642 {
 643         switch (content_type) {
 644         case HDMI_CONTENT_TYPE_GRAPHICS:
 645                 return "Graphics";
 646         case HDMI_CONTENT_TYPE_PHOTO:
 647                 return "Photo";
 648         case HDMI_CONTENT_TYPE_CINEMA:
 649                 return "Cinema";
 650         case HDMI_CONTENT_TYPE_GAME:
 651                 return "Game";
 652         }
 653         return "Invalid";
 654 }
 655
 656 /**
 657  * hdmi_avi_infoframe_log() - log info of HDMI AVI infoframe
 658  * @level: logging level
 659  * @dev: device
 660  * @frame: HDMI AVI infoframe
 661  */
 662 static void hdmi_avi_infoframe_log(const char *level,
 663                                    struct device *dev,
 664                                    struct hdmi_avi_infoframe *frame)
 665 {
 666         hdmi_infoframe_log_header(level, dev,
 667                                   (struct hdmi_any_infoframe *)frame);
 668
 669         hdmi_log("    colorspace: %s\n",
 670                         hdmi_colorspace_get_name(frame->colorspace));
 671         hdmi_log("    scan mode: %s\n",
 672                         hdmi_scan_mode_get_name(frame->scan_mode));
 673         hdmi_log("    colorimetry: %s\n",
 674                         hdmi_colorimetry_get_name(frame->colorimetry));
 675         hdmi_log("    picture aspect: %s\n",
 676                         hdmi_picture_aspect_get_name(frame->picture_aspect));
 677         hdmi_log("    active aspect: %s\n",
 678                         hdmi_active_aspect_get_name(frame->active_aspect));
 679         hdmi_log("    itc: %s\n", frame->itc ? "IT Content" : "No Data");
 680         hdmi_log("    extended colorimetry: %s\n",
 681                         hdmi_extended_colorimetry_get_name(frame->extended_colorimetry));
 682         hdmi_log("    quantization range: %s\n",
 683                         hdmi_quantization_range_get_name(frame->quantization_range));
 684         hdmi_log("    nups: %s\n", hdmi_nups_get_name(frame->nups));
 685         hdmi_log("    video code: %u\n", frame->video_code);
 686         hdmi_log("    ycc quantization range: %s\n",
 687                         hdmi_ycc_quantization_range_get_name(frame->ycc_quantization_range));
 688         hdmi_log("    hdmi content type: %s\n",
 689                         hdmi_content_type_get_name(frame->content_type));
 690         hdmi_log("    pixel repeat: %u\n", frame->pixel_repeat);
 691         hdmi_log("    bar top %u, bottom %u, left %u, right %u\n",
 692                         frame->top_bar, frame->bottom_bar,
 693                         frame->left_bar, frame->right_bar);
 694 }
 695
 696 static const char *hdmi_spd_sdi_get_name(enum hdmi_spd_sdi sdi)
 697 {
 698         if (sdi < 0 || sdi > 0xff)
 699                 return "Invalid";
 700         switch (sdi) {
 701         case HDMI_SPD_SDI_UNKNOWN:
 702                 return "Unknown";
 703         case HDMI_SPD_SDI_DSTB:
 704                 return "Digital STB";
 705         case HDMI_SPD_SDI_DVDP:
 706                 return "DVD Player";
 707         case HDMI_SPD_SDI_DVHS:
 708                 return "D-VHS";
 709         case HDMI_SPD_SDI_HDDVR:
 710                 return "HDD Videorecorder";
 711         case HDMI_SPD_SDI_DVC:
 712                 return "DVC";
 713         case HDMI_SPD_SDI_DSC:
 714                 return "DSC";
 715         case HDMI_SPD_SDI_VCD:
 716                 return "Video CD";
 717         case HDMI_SPD_SDI_GAME:
 718                 return "Game";
 719         case HDMI_SPD_SDI_PC:
 720                 return "PC General";
 721         case HDMI_SPD_SDI_BD:
 722                 return "Blu-Ray Disc (BD)";
 723         case HDMI_SPD_SDI_SACD:
 724                 return "Super Audio CD";
 725         case HDMI_SPD_SDI_HDDVD:
 726                 return "HD DVD";
 727         case HDMI_SPD_SDI_PMP:
 728                 return "PMP";
 729         }
 730         return "Reserved";
 731 }
 732
 733 /**
 734  * hdmi_spd_infoframe_log() - log info of HDMI SPD infoframe
 735  * @level: logging level
 736  * @dev: device
 737  * @frame: HDMI SPD infoframe
 738  */
 739 static void hdmi_spd_infoframe_log(const char *level,
 740                                    struct device *dev,
 741                                    struct hdmi_spd_infoframe *frame)
 742 {
 743         u8 buf[17];
 744
 745         hdmi_infoframe_log_header(level, dev,
 746                                   (struct hdmi_any_infoframe *)frame);
 747
 748         memset(buf, 0, sizeof(buf));
 749
 750         strncpy(buf, frame->vendor, 8);
 751         hdmi_log("    vendor: %s\n", buf);
 752         strncpy(buf, frame->product, 16);
 753         hdmi_log("    product: %s\n", buf);
 754         hdmi_log("    source device information: %s (0x%x)\n",
 755                 hdmi_spd_sdi_get_name(frame->sdi), frame->sdi);
 756 }
 757
 758 static const char *
 759 hdmi_audio_coding_type_get_name(enum hdmi_audio_coding_type coding_type)
 760 {
 761         switch (coding_type) {
 762         case HDMI_AUDIO_CODING_TYPE_STREAM:
 763                 return "Refer to Stream Header";
 764         case HDMI_AUDIO_CODING_TYPE_PCM:
 765                 return "PCM";
 766         case HDMI_AUDIO_CODING_TYPE_AC3:
 767                 return "AC-3";
 768         case HDMI_AUDIO_CODING_TYPE_MPEG1:
 769                 return "MPEG1";
 770         case HDMI_AUDIO_CODING_TYPE_MP3:
 771                 return "MP3";
 772         case HDMI_AUDIO_CODING_TYPE_MPEG2:
 773                 return "MPEG2";
 774         case HDMI_AUDIO_CODING_TYPE_AAC_LC:
 775                 return "AAC";
 776         case HDMI_AUDIO_CODING_TYPE_DTS:
 777                 return "DTS";
 778         case HDMI_AUDIO_CODING_TYPE_ATRAC:
 779                 return "ATRAC";
 780         case HDMI_AUDIO_CODING_TYPE_DSD:
 781                 return "One Bit Audio";
 782         case HDMI_AUDIO_CODING_TYPE_EAC3:
 783                 return "Dolby Digital +";
 784         case HDMI_AUDIO_CODING_TYPE_DTS_HD:
 785                 return "DTS-HD";
 786         case HDMI_AUDIO_CODING_TYPE_MLP:
 787                 return "MAT (MLP)";
 788         case HDMI_AUDIO_CODING_TYPE_DST:
 789                 return "DST";
 790         case HDMI_AUDIO_CODING_TYPE_WMA_PRO:
 791                 return "WMA PRO";
 792         case HDMI_AUDIO_CODING_TYPE_CXT:
 793                 return "Refer to CXT";
 794         }
 795         return "Invalid";
 796 }
 797
 798 static const char *
 799 hdmi_audio_sample_size_get_name(enum hdmi_audio_sample_size sample_size)
 800 {
 801         switch (sample_size) {
 802         case HDMI_AUDIO_SAMPLE_SIZE_STREAM:
 803                 return "Refer to Stream Header";
 804         case HDMI_AUDIO_SAMPLE_SIZE_16:
 805                 return "16 bit";
 806         case HDMI_AUDIO_SAMPLE_SIZE_20:
 807                 return "20 bit";
 808         case HDMI_AUDIO_SAMPLE_SIZE_24:
 809                 return "24 bit";
 810         }
 811         return "Invalid";
 812 }
 813
 814 static const char *
 815 hdmi_audio_sample_frequency_get_name(enum hdmi_audio_sample_frequency freq)
 816 {
 817         switch (freq) {
 818         case HDMI_AUDIO_SAMPLE_FREQUENCY_STREAM:
 819                 return "Refer to Stream Header";
 820         case HDMI_AUDIO_SAMPLE_FREQUENCY_32000:
 821                 return "32 kHz";
 822         case HDMI_AUDIO_SAMPLE_FREQUENCY_44100:
 823                 return "44.1 kHz (CD)";
 824         case HDMI_AUDIO_SAMPLE_FREQUENCY_48000:
 825                 return "48 kHz";
 826         case HDMI_AUDIO_SAMPLE_FREQUENCY_88200:
 827                 return "88.2 kHz";
 828         case HDMI_AUDIO_SAMPLE_FREQUENCY_96000:
 829                 return "96 kHz";
 830         case HDMI_AUDIO_SAMPLE_FREQUENCY_176400:
 831                 return "176.4 kHz";
 832         case HDMI_AUDIO_SAMPLE_FREQUENCY_192000:
 833                 return "192 kHz";
 834         }
 835         return "Invalid";
 836 }
 837
 838 static const char *
 839 hdmi_audio_coding_type_ext_get_name(enum hdmi_audio_coding_type_ext ctx)
 840 {
 841         if (ctx < 0 || ctx > 0x1f)
 842                 return "Invalid";
 843
 844         switch (ctx) {
 845         case HDMI_AUDIO_CODING_TYPE_EXT_CT:
 846                 return "Refer to CT";
 847         case HDMI_AUDIO_CODING_TYPE_EXT_HE_AAC:
 848                 return "HE AAC";
 849         case HDMI_AUDIO_CODING_TYPE_EXT_HE_AAC_V2:
 850                 return "HE AAC v2";
 851         case HDMI_AUDIO_CODING_TYPE_EXT_MPEG_SURROUND:
 852                 return "MPEG SURROUND";
 853         case HDMI_AUDIO_CODING_TYPE_EXT_MPEG4_HE_AAC:
 854                 return "MPEG-4 HE AAC";
 855         case HDMI_AUDIO_CODING_TYPE_EXT_MPEG4_HE_AAC_V2:
 856                 return "MPEG-4 HE AAC v2";
 857         case HDMI_AUDIO_CODING_TYPE_EXT_MPEG4_AAC_LC:
 858                 return "MPEG-4 AAC LC";
 859         case HDMI_AUDIO_CODING_TYPE_EXT_DRA:
 860                 return "DRA";
 861         case HDMI_AUDIO_CODING_TYPE_EXT_MPEG4_HE_AAC_SURROUND:
 862                 return "MPEG-4 HE AAC + MPEG Surround";
 863         case HDMI_AUDIO_CODING_TYPE_EXT_MPEG4_AAC_LC_SURROUND:
 864                 return "MPEG-4 AAC LC + MPEG Surround";
 865         }
 866         return "Reserved";
 867 }
 868
 869 /**
 870  * hdmi_audio_infoframe_log() - log info of HDMI AUDIO infoframe
 871  * @level: logging level
 872  * @dev: device
 873  * @frame: HDMI AUDIO infoframe
 874  */
 875 static void hdmi_audio_infoframe_log(const char *level,
 876                                      struct device *dev,
 877                                      struct hdmi_audio_infoframe *frame)
 878 {
 879         hdmi_infoframe_log_header(level, dev,
 880                                   (struct hdmi_any_infoframe *)frame);
 881
 882         if (frame->channels)
 883                 hdmi_log("    channels: %u\n", frame->channels - 1);
 884         else
 885                 hdmi_log("    channels: Refer to stream header\n");
 886         hdmi_log("    coding type: %s\n",
 887                         hdmi_audio_coding_type_get_name(frame->coding_type));
 888         hdmi_log("    sample size: %s\n",
 889                         hdmi_audio_sample_size_get_name(frame->sample_size));
 890         hdmi_log("    sample frequency: %s\n",
 891                         hdmi_audio_sample_frequency_get_name(frame->sample_frequency));
 892         hdmi_log("    coding type ext: %s\n",
 893                         hdmi_audio_coding_type_ext_get_name(frame->coding_type_ext));
 894         hdmi_log("    channel allocation: 0x%x\n",
 895                         frame->channel_allocation);
 896         hdmi_log("    level shift value: %u dB\n",
 897                         frame->level_shift_value);
 898         hdmi_log("    downmix inhibit: %s\n",
 899                         frame->downmix_inhibit ? "Yes" : "No");
 900 }
 901
 902 static const char *
 903 hdmi_3d_structure_get_name(enum hdmi_3d_structure s3d_struct)
 904 {
 905         if (s3d_struct < 0 || s3d_struct > 0xf)
 906                 return "Invalid";
 907
 908         switch (s3d_struct) {
 909         case HDMI_3D_STRUCTURE_FRAME_PACKING:
 910                 return "Frame Packing";
 911         case HDMI_3D_STRUCTURE_FIELD_ALTERNATIVE:
 912                 return "Field Alternative";
 913         case HDMI_3D_STRUCTURE_LINE_ALTERNATIVE:
 914                 return "Line Alternative";
 915         case HDMI_3D_STRUCTURE_SIDE_BY_SIDE_FULL:
 916                 return "Side-by-side (Full)";
 917         case HDMI_3D_STRUCTURE_L_DEPTH:
 918                 return "L + Depth";
 919         case HDMI_3D_STRUCTURE_L_DEPTH_GFX_GFX_DEPTH:
 920                 return "L + Depth + Graphics + Graphics-depth";
 921         case HDMI_3D_STRUCTURE_TOP_AND_BOTTOM:
 922                 return "Top-and-Bottom";
 923         case HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF:
 924                 return "Side-by-side (Half)";
 925         default:
 926                 break;
 927         }
 928         return "Reserved";
 929 }
 930
 931 /**
 932  * hdmi_vendor_infoframe_log() - log info of HDMI VENDOR infoframe
 933  * @level: logging level
 934  * @dev: device
 935  * @frame: HDMI VENDOR infoframe
 936  */
 937 static void
 938 hdmi_vendor_any_infoframe_log(const char *level,
 939                               struct device *dev,
 940                               union hdmi_vendor_any_infoframe *frame)
 941 {
 942         struct hdmi_vendor_infoframe *hvf = &frame->hdmi;
 943
 944         hdmi_infoframe_log_header(level, dev,
 945                                   (struct hdmi_any_infoframe *)frame);
 946
 947         if (frame->any.oui != HDMI_IEEE_OUI) {
 948                 hdmi_log("    not a HDMI vendor infoframe\n");
 949                 return;
 950         }
 951         if (hvf->vic == 0 && hvf->s3d_struct == HDMI_3D_STRUCTURE_INVALID) {
 952                 hdmi_log("    empty frame\n");
 953                 return;
 954         }
 955
 956         if (hvf->vic)
 957                 hdmi_log("    HDMI VIC: %u\n", hvf->vic);
 958         if (hvf->s3d_struct != HDMI_3D_STRUCTURE_INVALID) {
 959                 hdmi_log("    3D structure: %s\n",
 960                                 hdmi_3d_structure_get_name(hvf->s3d_struct));
 961                 if (hvf->s3d_struct >= HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF)
 962                         hdmi_log("    3D extension data: %d\n",
 963                                         hvf->s3d_ext_data);
 964         }
 965 }
 966
 967 /**
 968  * hdmi_infoframe_log() - log info of HDMI infoframe
 969  * @level: logging level
 970  * @dev: device
 971  * @frame: HDMI infoframe
 972  */
 973 void hdmi_infoframe_log(const char *level,
 974                         struct device *dev,
 975                         union hdmi_infoframe *frame)
 976 {
 977         switch (frame->any.type) {
 978         case HDMI_INFOFRAME_TYPE_AVI:
 979                 hdmi_avi_infoframe_log(level, dev, &frame->avi);
 980                 break;
 981         case HDMI_INFOFRAME_TYPE_SPD:
 982                 hdmi_spd_infoframe_log(level, dev, &frame->spd);
 983                 break;
 984         case HDMI_INFOFRAME_TYPE_AUDIO:
 985                 hdmi_audio_infoframe_log(level, dev, &frame->audio);
 986                 break;
 987         case HDMI_INFOFRAME_TYPE_VENDOR:
 988                 hdmi_vendor_any_infoframe_log(level, dev, &frame->vendor);
 989                 break;
 990         }
 991 }
 992 EXPORT_SYMBOL(hdmi_infoframe_log);
 993
 994 /**
 995  * hdmi_avi_infoframe_unpack() - unpack binary buffer to a HDMI AVI infoframe
 996  * @buffer: source buffer
 997  * @frame: HDMI AVI infoframe
 998  *
 999  * Unpacks the information contained in binary @buffer into a structured
1000  * @frame of the HDMI Auxiliary Video (AVI) information frame.
1001  * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
1002  * specification.
1003  *
1004  * Returns 0 on success or a negative error code on failure.
1005  */
1006 static int hdmi_avi_infoframe_unpack(struct hdmi_avi_infoframe *frame,
1007                                      void *buffer)
1008 {
1009         u8 *ptr = buffer;
1010         int ret;
1011
1012         if (ptr[0] != HDMI_INFOFRAME_TYPE_AVI ||
1013             ptr[1] != 2 ||
1014             ptr[2] != HDMI_AVI_INFOFRAME_SIZE)
1015                 return -EINVAL;
1016
1017         if (hdmi_infoframe_checksum(buffer, HDMI_INFOFRAME_SIZE(AVI)) != 0)
1018                 return -EINVAL;
1019
1020         ret = hdmi_avi_infoframe_init(frame);
1021         if (ret)
1022                 return ret;
1023
1024         ptr += HDMI_INFOFRAME_HEADER_SIZE;
1025
1026         frame->colorspace = (ptr[0] >> 5) & 0x3;
1027         if (ptr[0] & 0x10)
1028                 frame->active_aspect = ptr[1] & 0xf;
1029         if (ptr[0] & 0x8) {
1030                 frame->top_bar = (ptr[5] << 8) + ptr[6];
1031                 frame->bottom_bar = (ptr[7] << 8) + ptr[8];
1032         }
1033         if (ptr[0] & 0x4) {
1034                 frame->left_bar = (ptr[9] << 8) + ptr[10];
1035                 frame->right_bar = (ptr[11] << 8) + ptr[12];
1036         }
1037         frame->scan_mode = ptr[0] & 0x3;
1038
1039         frame->colorimetry = (ptr[1] >> 6) & 0x3;
1040         frame->picture_aspect = (ptr[1] >> 4) & 0x3;
1041         frame->active_aspect = ptr[1] & 0xf;
1042
1043         frame->itc = ptr[2] & 0x80 ? true : false;
1044         frame->extended_colorimetry = (ptr[2] >> 4) & 0x7;
1045         frame->quantization_range = (ptr[2] >> 2) & 0x3;
1046         frame->nups = ptr[2] & 0x3;
1047
1048         frame->video_code = ptr[3] & 0x7f;
1049         frame->ycc_quantization_range = (ptr[4] >> 6) & 0x3;
1050         frame->content_type = (ptr[4] >> 4) & 0x3;
1051
1052         frame->pixel_repeat = ptr[4] & 0xf;
1053
1054         return 0;
1055 }
1056
1057 /**
1058  * hdmi_spd_infoframe_unpack() - unpack binary buffer to a HDMI SPD infoframe
1059  * @buffer: source buffer
1060  * @frame: HDMI SPD infoframe
1061  *
1062  * Unpacks the information contained in binary @buffer into a structured
1063  * @frame of the HDMI Source Product Description (SPD) information frame.
1064  * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
1065  * specification.
1066  *
1067  * Returns 0 on success or a negative error code on failure.
1068  */
1069 static int hdmi_spd_infoframe_unpack(struct hdmi_spd_infoframe *frame,
1070                                      void *buffer)
1071 {
1072         u8 *ptr = buffer;
1073         int ret;
1074
1075         if (ptr[0] != HDMI_INFOFRAME_TYPE_SPD ||
1076             ptr[1] != 1 ||
1077             ptr[2] != HDMI_SPD_INFOFRAME_SIZE) {
1078                 return -EINVAL;
1079         }
1080
1081         if (hdmi_infoframe_checksum(buffer, HDMI_INFOFRAME_SIZE(SPD)) != 0)
1082                 return -EINVAL;
1083
1084         ptr += HDMI_INFOFRAME_HEADER_SIZE;
1085
1086         ret = hdmi_spd_infoframe_init(frame, ptr, ptr + 8);
1087         if (ret)
1088                 return ret;
1089
1090         frame->sdi = ptr[24];
1091
1092         return 0;
1093 }
1094
1095 /**
1096  * hdmi_audio_infoframe_unpack() - unpack binary buffer to a HDMI AUDIO infoframe
1097  * @buffer: source buffer
1098  * @frame: HDMI Audio infoframe
1099  *
1100  * Unpacks the information contained in binary @buffer into a structured
1101  * @frame of the HDMI Audio information frame.
1102  * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
1103  * specification.
1104  *
1105  * Returns 0 on success or a negative error code on failure.
1106  */
1107 static int hdmi_audio_infoframe_unpack(struct hdmi_audio_infoframe *frame,
1108                                        void *buffer)
1109 {
1110         u8 *ptr = buffer;
1111         int ret;
1112
1113         if (ptr[0] != HDMI_INFOFRAME_TYPE_AUDIO ||
1114             ptr[1] != 1 ||
1115             ptr[2] != HDMI_AUDIO_INFOFRAME_SIZE) {
1116                 return -EINVAL;
1117         }
1118
1119         if (hdmi_infoframe_checksum(buffer, HDMI_INFOFRAME_SIZE(AUDIO)) != 0)
1120                 return -EINVAL;
1121
1122         ret = hdmi_audio_infoframe_init(frame);
1123         if (ret)
1124                 return ret;
1125
1126         ptr += HDMI_INFOFRAME_HEADER_SIZE;
1127
1128         frame->channels = ptr[0] & 0x7;
1129         frame->coding_type = (ptr[0] >> 4) & 0xf;
1130         frame->sample_size = ptr[1] & 0x3;
1131         frame->sample_frequency = (ptr[1] >> 2) & 0x7;
1132         frame->coding_type_ext = ptr[2] & 0x1f;
1133         frame->channel_allocation = ptr[3];
1134         frame->level_shift_value = (ptr[4] >> 3) & 0xf;
1135         frame->downmix_inhibit = ptr[4] & 0x80 ? true : false;
1136
1137         return 0;
1138 }
1139
1140 /**
1141  * hdmi_vendor_infoframe_unpack() - unpack binary buffer to a HDMI vendor infoframe
1142  * @buffer: source buffer
1143  * @frame: HDMI Vendor infoframe
1144  *
1145  * Unpacks the information contained in binary @buffer into a structured
1146  * @frame of the HDMI Vendor information frame.
1147  * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
1148  * specification.
1149  *
1150  * Returns 0 on success or a negative error code on failure.
1151  */
1152 static int
1153 hdmi_vendor_any_infoframe_unpack(union hdmi_vendor_any_infoframe *frame,
1154                                  void *buffer)
1155 {
1156         u8 *ptr = buffer;
1157         size_t length;
1158         int ret;
1159         u8 hdmi_video_format;
1160         struct hdmi_vendor_infoframe *hvf = &frame->hdmi;
1161
1162         if (ptr[0] != HDMI_INFOFRAME_TYPE_VENDOR ||
1163             ptr[1] != 1 ||
1164             (ptr[2] != 5 && ptr[2] != 6))
1165                 return -EINVAL;
1166
1167         length = ptr[2];
1168
1169         if (hdmi_infoframe_checksum(buffer,
1170                                     HDMI_INFOFRAME_HEADER_SIZE + length) != 0)
1171                 return -EINVAL;
1172
1173         ptr += HDMI_INFOFRAME_HEADER_SIZE;
1174
1175         /* HDMI OUI */
1176         if ((ptr[0] != 0x03) ||
1177             (ptr[1] != 0x0c) ||
1178             (ptr[2] != 0x00))
1179                 return -EINVAL;
1180
1181         hdmi_video_format = ptr[3] >> 5;
1182
1183         if (hdmi_video_format > 0x2)
1184                 return -EINVAL;
1185
1186         ret = hdmi_vendor_infoframe_init(hvf);
1187         if (ret)
1188                 return ret;
1189
1190         hvf->length = length;
1191
1192         if (hdmi_video_format == 0x1) {
1193                 hvf->vic = ptr[4];
1194         } else if (hdmi_video_format == 0x2) {
1195                 hvf->s3d_struct = ptr[4] >> 4;
1196                 if (hvf->s3d_struct >= HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF) {
1197                         if (length == 6)
1198                                 hvf->s3d_ext_data = ptr[5] >> 4;
1199                         else
1200                                 return -EINVAL;
1201                 }
1202         }
1203
1204         return 0;
1205 }
1206
1207 /**
1208  * hdmi_infoframe_unpack() - unpack binary buffer to a HDMI infoframe
1209  * @buffer: source buffer
1210  * @frame: HDMI infoframe
1211  *
1212  * Unpacks the information contained in binary buffer @buffer into a structured
1213  * @frame of a HDMI infoframe.
1214  * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
1215  * specification.
1216  *
1217  * Returns 0 on success or a negative error code on failure.
1218  */
1219 int hdmi_infoframe_unpack(union hdmi_infoframe *frame, void *buffer)
1220 {
1221         int ret;
1222         u8 *ptr = buffer;
1223
1224         switch (ptr[0]) {
1225         case HDMI_INFOFRAME_TYPE_AVI:
1226                 ret = hdmi_avi_infoframe_unpack(&frame->avi, buffer);
1227                 break;
1228         case HDMI_INFOFRAME_TYPE_SPD:
1229                 ret = hdmi_spd_infoframe_unpack(&frame->spd, buffer);
1230                 break;
1231         case HDMI_INFOFRAME_TYPE_AUDIO:
1232                 ret = hdmi_audio_infoframe_unpack(&frame->audio, buffer);
1233                 break;
1234         case HDMI_INFOFRAME_TYPE_VENDOR:
1235                 ret = hdmi_vendor_any_infoframe_unpack(&frame->vendor, buffer);
1236                 break;
1237         default:
1238                 ret = -EINVAL;
1239                 break;
1240         }
1241
1242         return ret;
1243 }
1244 EXPORT_SYMBOL(hdmi_infoframe_unpack);