drivers/video/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/string.h>
  30 #include <linux/device.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 static int hdmi_vendor_infoframe_length(const struct hdmi_vendor_infoframe *frame)
 325 {
 326         /* for side by side (half) we also need to provide 3D_Ext_Data */
 327         if (frame->s3d_struct >= HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF)
 328                 return 6;
 329         else if (frame->vic != 0 || frame->s3d_struct != HDMI_3D_STRUCTURE_INVALID)
 330                 return 5;
 331         else
 332                 return 4;
 333 }
 334
 335 /**
 336  * hdmi_vendor_infoframe_pack() - write a HDMI vendor infoframe to binary buffer
 337  * @frame: HDMI infoframe
 338  * @buffer: destination buffer
 339  * @size: size of buffer
 340  *
 341  * Packs the information contained in the @frame structure into a binary
 342  * representation that can be written into the corresponding controller
 343  * registers. Also computes the checksum as required by section 5.3.5 of
 344  * the HDMI 1.4 specification.
 345  *
 346  * Returns the number of bytes packed into the binary buffer or a negative
 347  * error code on failure.
 348  */
 349 ssize_t hdmi_vendor_infoframe_pack(struct hdmi_vendor_infoframe *frame,
 350                                  void *buffer, size_t size)
 351 {
 352         u8 *ptr = buffer;
 353         size_t length;
 354
 355         /* only one of those can be supplied */
 356         if (frame->vic != 0 && frame->s3d_struct != HDMI_3D_STRUCTURE_INVALID)
 357                 return -EINVAL;
 358
 359         frame->length = hdmi_vendor_infoframe_length(frame);
 360
 361         length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
 362
 363         if (size < length)
 364                 return -ENOSPC;
 365
 366         memset(buffer, 0, size);
 367
 368         ptr[0] = frame->type;
 369         ptr[1] = frame->version;
 370         ptr[2] = frame->length;
 371         ptr[3] = 0; /* checksum */
 372
 373         /* HDMI OUI */
 374         ptr[4] = 0x03;
 375         ptr[5] = 0x0c;
 376         ptr[6] = 0x00;
 377
 378         if (frame->s3d_struct != HDMI_3D_STRUCTURE_INVALID) {
 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         } else if (frame->vic) {
 384                 ptr[7] = 0x1 << 5;      /* video format */
 385                 ptr[8] = frame->vic;
 386         } else {
 387                 ptr[7] = 0x0 << 5;      /* video format */
 388         }
 389
 390         hdmi_infoframe_set_checksum(buffer, length);
 391
 392         return length;
 393 }
 394 EXPORT_SYMBOL(hdmi_vendor_infoframe_pack);
 395
 396 /*
 397  * hdmi_vendor_any_infoframe_pack() - write a vendor infoframe to binary buffer
 398  */
 399 static ssize_t
 400 hdmi_vendor_any_infoframe_pack(union hdmi_vendor_any_infoframe *frame,
 401                            void *buffer, size_t size)
 402 {
 403         /* we only know about HDMI vendor infoframes */
 404         if (frame->any.oui != HDMI_IEEE_OUI)
 405                 return -EINVAL;
 406
 407         return hdmi_vendor_infoframe_pack(&frame->hdmi, buffer, size);
 408 }
 409
 410 /**
 411  * hdmi_infoframe_pack() - write a HDMI infoframe to binary buffer
 412  * @frame: HDMI infoframe
 413  * @buffer: destination buffer
 414  * @size: size of buffer
 415  *
 416  * Packs the information contained in the @frame structure into a binary
 417  * representation that can be written into the corresponding controller
 418  * registers. Also computes the checksum as required by section 5.3.5 of
 419  * the HDMI 1.4 specification.
 420  *
 421  * Returns the number of bytes packed into the binary buffer or a negative
 422  * error code on failure.
 423  */
 424 ssize_t
 425 hdmi_infoframe_pack(union hdmi_infoframe *frame, void *buffer, size_t size)
 426 {
 427         ssize_t length;
 428
 429         switch (frame->any.type) {
 430         case HDMI_INFOFRAME_TYPE_AVI:
 431                 length = hdmi_avi_infoframe_pack(&frame->avi, buffer, size);
 432                 break;
 433         case HDMI_INFOFRAME_TYPE_SPD:
 434                 length = hdmi_spd_infoframe_pack(&frame->spd, buffer, size);
 435                 break;
 436         case HDMI_INFOFRAME_TYPE_AUDIO:
 437                 length = hdmi_audio_infoframe_pack(&frame->audio, buffer, size);
 438                 break;
 439         case HDMI_INFOFRAME_TYPE_VENDOR:
 440                 length = hdmi_vendor_any_infoframe_pack(&frame->vendor,
 441                                                         buffer, size);
 442                 break;
 443         default:
 444                 WARN(1, "Bad infoframe type %d\n", frame->any.type);
 445                 length = -EINVAL;
 446         }
 447
 448         return length;
 449 }
 450 EXPORT_SYMBOL(hdmi_infoframe_pack);
 451
 452 static const char *hdmi_infoframe_type_get_name(enum hdmi_infoframe_type type)
 453 {
 454         if (type < 0x80 || type > 0x9f)
 455                 return "Invalid";
 456         switch (type) {
 457         case HDMI_INFOFRAME_TYPE_VENDOR:
 458                 return "Vendor";
 459         case HDMI_INFOFRAME_TYPE_AVI:
 460                 return "Auxiliary Video Information (AVI)";
 461         case HDMI_INFOFRAME_TYPE_SPD:
 462                 return "Source Product Description (SPD)";
 463         case HDMI_INFOFRAME_TYPE_AUDIO:
 464                 return "Audio";
 465         }
 466         return "Reserved";
 467 }
 468
 469 static void hdmi_infoframe_log_header(const char *level,
 470                                       struct device *dev,
 471                                       struct hdmi_any_infoframe *frame)
 472 {
 473         hdmi_log("HDMI infoframe: %s, version %u, length %u\n",
 474                 hdmi_infoframe_type_get_name(frame->type),
 475                 frame->version, frame->length);
 476 }
 477
 478 static const char *hdmi_colorspace_get_name(enum hdmi_colorspace colorspace)
 479 {
 480         switch (colorspace) {
 481         case HDMI_COLORSPACE_RGB:
 482                 return "RGB";
 483         case HDMI_COLORSPACE_YUV422:
 484                 return "YCbCr 4:2:2";
 485         case HDMI_COLORSPACE_YUV444:
 486                 return "YCbCr 4:4:4";
 487         case HDMI_COLORSPACE_YUV420:
 488                 return "YCbCr 4:2:0";
 489         case HDMI_COLORSPACE_RESERVED4:
 490                 return "Reserved (4)";
 491         case HDMI_COLORSPACE_RESERVED5:
 492                 return "Reserved (5)";
 493         case HDMI_COLORSPACE_RESERVED6:
 494                 return "Reserved (6)";
 495         case HDMI_COLORSPACE_IDO_DEFINED:
 496                 return "IDO Defined";
 497         }
 498         return "Invalid";
 499 }
 500
 501 static const char *hdmi_scan_mode_get_name(enum hdmi_scan_mode scan_mode)
 502 {
 503         switch (scan_mode) {
 504         case HDMI_SCAN_MODE_NONE:
 505                 return "No Data";
 506         case HDMI_SCAN_MODE_OVERSCAN:
 507                 return "Overscan";
 508         case HDMI_SCAN_MODE_UNDERSCAN:
 509                 return "Underscan";
 510         case HDMI_SCAN_MODE_RESERVED:
 511                 return "Reserved";
 512         }
 513         return "Invalid";
 514 }
 515
 516 static const char *hdmi_colorimetry_get_name(enum hdmi_colorimetry colorimetry)
 517 {
 518         switch (colorimetry) {
 519         case HDMI_COLORIMETRY_NONE:
 520                 return "No Data";
 521         case HDMI_COLORIMETRY_ITU_601:
 522                 return "ITU601";
 523         case HDMI_COLORIMETRY_ITU_709:
 524                 return "ITU709";
 525         case HDMI_COLORIMETRY_EXTENDED:
 526                 return "Extended";
 527         }
 528         return "Invalid";
 529 }
 530
 531 static const char *
 532 hdmi_picture_aspect_get_name(enum hdmi_picture_aspect picture_aspect)
 533 {
 534         switch (picture_aspect) {
 535         case HDMI_PICTURE_ASPECT_NONE:
 536                 return "No Data";
 537         case HDMI_PICTURE_ASPECT_4_3:
 538                 return "4:3";
 539         case HDMI_PICTURE_ASPECT_16_9:
 540                 return "16:9";
 541         case HDMI_PICTURE_ASPECT_64_27:
 542                 return "64:27";
 543         case HDMI_PICTURE_ASPECT_256_135:
 544                 return "256:135";
 545         case HDMI_PICTURE_ASPECT_RESERVED:
 546                 return "Reserved";
 547         }
 548         return "Invalid";
 549 }
 550
 551 static const char *
 552 hdmi_active_aspect_get_name(enum hdmi_active_aspect active_aspect)
 553 {
 554         if (active_aspect < 0 || active_aspect > 0xf)
 555                 return "Invalid";
 556
 557         switch (active_aspect) {
 558         case HDMI_ACTIVE_ASPECT_16_9_TOP:
 559                 return "16:9 Top";
 560         case HDMI_ACTIVE_ASPECT_14_9_TOP:
 561                 return "14:9 Top";
 562         case HDMI_ACTIVE_ASPECT_16_9_CENTER:
 563                 return "16:9 Center";
 564         case HDMI_ACTIVE_ASPECT_PICTURE:
 565                 return "Same as Picture";
 566         case HDMI_ACTIVE_ASPECT_4_3:
 567                 return "4:3";
 568         case HDMI_ACTIVE_ASPECT_16_9:
 569                 return "16:9";
 570         case HDMI_ACTIVE_ASPECT_14_9:
 571                 return "14:9";
 572         case HDMI_ACTIVE_ASPECT_4_3_SP_14_9:
 573                 return "4:3 SP 14:9";
 574         case HDMI_ACTIVE_ASPECT_16_9_SP_14_9:
 575                 return "16:9 SP 14:9";
 576         case HDMI_ACTIVE_ASPECT_16_9_SP_4_3:
 577                 return "16:9 SP 4:3";
 578         }
 579         return "Reserved";
 580 }
 581
 582 static const char *
 583 hdmi_extended_colorimetry_get_name(enum hdmi_extended_colorimetry ext_col)
 584 {
 585         switch (ext_col) {
 586         case HDMI_EXTENDED_COLORIMETRY_XV_YCC_601:
 587                 return "xvYCC 601";
 588         case HDMI_EXTENDED_COLORIMETRY_XV_YCC_709:
 589                 return "xvYCC 709";
 590         case HDMI_EXTENDED_COLORIMETRY_S_YCC_601:
 591                 return "sYCC 601";
 592         case HDMI_EXTENDED_COLORIMETRY_ADOBE_YCC_601:
 593                 return "Adobe YCC 601";
 594         case HDMI_EXTENDED_COLORIMETRY_ADOBE_RGB:
 595                 return "Adobe RGB";
 596         case HDMI_EXTENDED_COLORIMETRY_BT2020_CONST_LUM:
 597                 return "BT.2020 Constant Luminance";
 598         case HDMI_EXTENDED_COLORIMETRY_BT2020:
 599                 return "BT.2020";
 600         case HDMI_EXTENDED_COLORIMETRY_RESERVED:
 601                 return "Reserved";
 602         }
 603         return "Invalid";
 604 }
 605
 606 static const char *
 607 hdmi_quantization_range_get_name(enum hdmi_quantization_range qrange)
 608 {
 609         switch (qrange) {
 610         case HDMI_QUANTIZATION_RANGE_DEFAULT:
 611                 return "Default";
 612         case HDMI_QUANTIZATION_RANGE_LIMITED:
 613                 return "Limited";
 614         case HDMI_QUANTIZATION_RANGE_FULL:
 615                 return "Full";
 616         case HDMI_QUANTIZATION_RANGE_RESERVED:
 617                 return "Reserved";
 618         }
 619         return "Invalid";
 620 }
 621
 622 static const char *hdmi_nups_get_name(enum hdmi_nups nups)
 623 {
 624         switch (nups) {
 625         case HDMI_NUPS_UNKNOWN:
 626                 return "Unknown Non-uniform Scaling";
 627         case HDMI_NUPS_HORIZONTAL:
 628                 return "Horizontally Scaled";
 629         case HDMI_NUPS_VERTICAL:
 630                 return "Vertically Scaled";
 631         case HDMI_NUPS_BOTH:
 632                 return "Horizontally and Vertically Scaled";
 633         }
 634         return "Invalid";
 635 }
 636
 637 static const char *
 638 hdmi_ycc_quantization_range_get_name(enum hdmi_ycc_quantization_range qrange)
 639 {
 640         switch (qrange) {
 641         case HDMI_YCC_QUANTIZATION_RANGE_LIMITED:
 642                 return "Limited";
 643         case HDMI_YCC_QUANTIZATION_RANGE_FULL:
 644                 return "Full";
 645         }
 646         return "Invalid";
 647 }
 648
 649 static const char *
 650 hdmi_content_type_get_name(enum hdmi_content_type content_type)
 651 {
 652         switch (content_type) {
 653         case HDMI_CONTENT_TYPE_GRAPHICS:
 654                 return "Graphics";
 655         case HDMI_CONTENT_TYPE_PHOTO:
 656                 return "Photo";
 657         case HDMI_CONTENT_TYPE_CINEMA:
 658                 return "Cinema";
 659         case HDMI_CONTENT_TYPE_GAME:
 660                 return "Game";
 661         }
 662         return "Invalid";
 663 }
 664
 665 /**
 666  * hdmi_avi_infoframe_log() - log info of HDMI AVI infoframe
 667  * @level: logging level
 668  * @dev: device
 669  * @frame: HDMI AVI infoframe
 670  */
 671 static void hdmi_avi_infoframe_log(const char *level,
 672                                    struct device *dev,
 673                                    struct hdmi_avi_infoframe *frame)
 674 {
 675         hdmi_infoframe_log_header(level, dev,
 676                                   (struct hdmi_any_infoframe *)frame);
 677
 678         hdmi_log("    colorspace: %s\n",
 679                         hdmi_colorspace_get_name(frame->colorspace));
 680         hdmi_log("    scan mode: %s\n",
 681                         hdmi_scan_mode_get_name(frame->scan_mode));
 682         hdmi_log("    colorimetry: %s\n",
 683                         hdmi_colorimetry_get_name(frame->colorimetry));
 684         hdmi_log("    picture aspect: %s\n",
 685                         hdmi_picture_aspect_get_name(frame->picture_aspect));
 686         hdmi_log("    active aspect: %s\n",
 687                         hdmi_active_aspect_get_name(frame->active_aspect));
 688         hdmi_log("    itc: %s\n", frame->itc ? "IT Content" : "No Data");
 689         hdmi_log("    extended colorimetry: %s\n",
 690                         hdmi_extended_colorimetry_get_name(frame->extended_colorimetry));
 691         hdmi_log("    quantization range: %s\n",
 692                         hdmi_quantization_range_get_name(frame->quantization_range));
 693         hdmi_log("    nups: %s\n", hdmi_nups_get_name(frame->nups));
 694         hdmi_log("    video code: %u\n", frame->video_code);
 695         hdmi_log("    ycc quantization range: %s\n",
 696                         hdmi_ycc_quantization_range_get_name(frame->ycc_quantization_range));
 697         hdmi_log("    hdmi content type: %s\n",
 698                         hdmi_content_type_get_name(frame->content_type));
 699         hdmi_log("    pixel repeat: %u\n", frame->pixel_repeat);
 700         hdmi_log("    bar top %u, bottom %u, left %u, right %u\n",
 701                         frame->top_bar, frame->bottom_bar,
 702                         frame->left_bar, frame->right_bar);
 703 }
 704
 705 static const char *hdmi_spd_sdi_get_name(enum hdmi_spd_sdi sdi)
 706 {
 707         if (sdi < 0 || sdi > 0xff)
 708                 return "Invalid";
 709         switch (sdi) {
 710         case HDMI_SPD_SDI_UNKNOWN:
 711                 return "Unknown";
 712         case HDMI_SPD_SDI_DSTB:
 713                 return "Digital STB";
 714         case HDMI_SPD_SDI_DVDP:
 715                 return "DVD Player";
 716         case HDMI_SPD_SDI_DVHS:
 717                 return "D-VHS";
 718         case HDMI_SPD_SDI_HDDVR:
 719                 return "HDD Videorecorder";
 720         case HDMI_SPD_SDI_DVC:
 721                 return "DVC";
 722         case HDMI_SPD_SDI_DSC:
 723                 return "DSC";
 724         case HDMI_SPD_SDI_VCD:
 725                 return "Video CD";
 726         case HDMI_SPD_SDI_GAME:
 727                 return "Game";
 728         case HDMI_SPD_SDI_PC:
 729                 return "PC General";
 730         case HDMI_SPD_SDI_BD:
 731                 return "Blu-Ray Disc (BD)";
 732         case HDMI_SPD_SDI_SACD:
 733                 return "Super Audio CD";
 734         case HDMI_SPD_SDI_HDDVD:
 735                 return "HD DVD";
 736         case HDMI_SPD_SDI_PMP:
 737                 return "PMP";
 738         }
 739         return "Reserved";
 740 }
 741
 742 /**
 743  * hdmi_spd_infoframe_log() - log info of HDMI SPD infoframe
 744  * @level: logging level
 745  * @dev: device
 746  * @frame: HDMI SPD infoframe
 747  */
 748 static void hdmi_spd_infoframe_log(const char *level,
 749                                    struct device *dev,
 750                                    struct hdmi_spd_infoframe *frame)
 751 {
 752         u8 buf[17];
 753
 754         hdmi_infoframe_log_header(level, dev,
 755                                   (struct hdmi_any_infoframe *)frame);
 756
 757         memset(buf, 0, sizeof(buf));
 758
 759         strncpy(buf, frame->vendor, 8);
 760         hdmi_log("    vendor: %s\n", buf);
 761         strncpy(buf, frame->product, 16);
 762         hdmi_log("    product: %s\n", buf);
 763         hdmi_log("    source device information: %s (0x%x)\n",
 764                 hdmi_spd_sdi_get_name(frame->sdi), frame->sdi);
 765 }
 766
 767 static const char *
 768 hdmi_audio_coding_type_get_name(enum hdmi_audio_coding_type coding_type)
 769 {
 770         switch (coding_type) {
 771         case HDMI_AUDIO_CODING_TYPE_STREAM:
 772                 return "Refer to Stream Header";
 773         case HDMI_AUDIO_CODING_TYPE_PCM:
 774                 return "PCM";
 775         case HDMI_AUDIO_CODING_TYPE_AC3:
 776                 return "AC-3";
 777         case HDMI_AUDIO_CODING_TYPE_MPEG1:
 778                 return "MPEG1";
 779         case HDMI_AUDIO_CODING_TYPE_MP3:
 780                 return "MP3";
 781         case HDMI_AUDIO_CODING_TYPE_MPEG2:
 782                 return "MPEG2";
 783         case HDMI_AUDIO_CODING_TYPE_AAC_LC:
 784                 return "AAC";
 785         case HDMI_AUDIO_CODING_TYPE_DTS:
 786                 return "DTS";
 787         case HDMI_AUDIO_CODING_TYPE_ATRAC:
 788                 return "ATRAC";
 789         case HDMI_AUDIO_CODING_TYPE_DSD:
 790                 return "One Bit Audio";
 791         case HDMI_AUDIO_CODING_TYPE_EAC3:
 792                 return "Dolby Digital +";
 793         case HDMI_AUDIO_CODING_TYPE_DTS_HD:
 794                 return "DTS-HD";
 795         case HDMI_AUDIO_CODING_TYPE_MLP:
 796                 return "MAT (MLP)";
 797         case HDMI_AUDIO_CODING_TYPE_DST:
 798                 return "DST";
 799         case HDMI_AUDIO_CODING_TYPE_WMA_PRO:
 800                 return "WMA PRO";
 801         case HDMI_AUDIO_CODING_TYPE_CXT:
 802                 return "Refer to CXT";
 803         }
 804         return "Invalid";
 805 }
 806
 807 static const char *
 808 hdmi_audio_sample_size_get_name(enum hdmi_audio_sample_size sample_size)
 809 {
 810         switch (sample_size) {
 811         case HDMI_AUDIO_SAMPLE_SIZE_STREAM:
 812                 return "Refer to Stream Header";
 813         case HDMI_AUDIO_SAMPLE_SIZE_16:
 814                 return "16 bit";
 815         case HDMI_AUDIO_SAMPLE_SIZE_20:
 816                 return "20 bit";
 817         case HDMI_AUDIO_SAMPLE_SIZE_24:
 818                 return "24 bit";
 819         }
 820         return "Invalid";
 821 }
 822
 823 static const char *
 824 hdmi_audio_sample_frequency_get_name(enum hdmi_audio_sample_frequency freq)
 825 {
 826         switch (freq) {
 827         case HDMI_AUDIO_SAMPLE_FREQUENCY_STREAM:
 828                 return "Refer to Stream Header";
 829         case HDMI_AUDIO_SAMPLE_FREQUENCY_32000:
 830                 return "32 kHz";
 831         case HDMI_AUDIO_SAMPLE_FREQUENCY_44100:
 832                 return "44.1 kHz (CD)";
 833         case HDMI_AUDIO_SAMPLE_FREQUENCY_48000:
 834                 return "48 kHz";
 835         case HDMI_AUDIO_SAMPLE_FREQUENCY_88200:
 836                 return "88.2 kHz";
 837         case HDMI_AUDIO_SAMPLE_FREQUENCY_96000:
 838                 return "96 kHz";
 839         case HDMI_AUDIO_SAMPLE_FREQUENCY_176400:
 840                 return "176.4 kHz";
 841         case HDMI_AUDIO_SAMPLE_FREQUENCY_192000:
 842                 return "192 kHz";
 843         }
 844         return "Invalid";
 845 }
 846
 847 static const char *
 848 hdmi_audio_coding_type_ext_get_name(enum hdmi_audio_coding_type_ext ctx)
 849 {
 850         if (ctx < 0 || ctx > 0x1f)
 851                 return "Invalid";
 852
 853         switch (ctx) {
 854         case HDMI_AUDIO_CODING_TYPE_EXT_CT:
 855                 return "Refer to CT";
 856         case HDMI_AUDIO_CODING_TYPE_EXT_HE_AAC:
 857                 return "HE AAC";
 858         case HDMI_AUDIO_CODING_TYPE_EXT_HE_AAC_V2:
 859                 return "HE AAC v2";
 860         case HDMI_AUDIO_CODING_TYPE_EXT_MPEG_SURROUND:
 861                 return "MPEG SURROUND";
 862         case HDMI_AUDIO_CODING_TYPE_EXT_MPEG4_HE_AAC:
 863                 return "MPEG-4 HE AAC";
 864         case HDMI_AUDIO_CODING_TYPE_EXT_MPEG4_HE_AAC_V2:
 865                 return "MPEG-4 HE AAC v2";
 866         case HDMI_AUDIO_CODING_TYPE_EXT_MPEG4_AAC_LC:
 867                 return "MPEG-4 AAC LC";
 868         case HDMI_AUDIO_CODING_TYPE_EXT_DRA:
 869                 return "DRA";
 870         case HDMI_AUDIO_CODING_TYPE_EXT_MPEG4_HE_AAC_SURROUND:
 871                 return "MPEG-4 HE AAC + MPEG Surround";
 872         case HDMI_AUDIO_CODING_TYPE_EXT_MPEG4_AAC_LC_SURROUND:
 873                 return "MPEG-4 AAC LC + MPEG Surround";
 874         }
 875         return "Reserved";
 876 }
 877
 878 /**
 879  * hdmi_audio_infoframe_log() - log info of HDMI AUDIO infoframe
 880  * @level: logging level
 881  * @dev: device
 882  * @frame: HDMI AUDIO infoframe
 883  */
 884 static void hdmi_audio_infoframe_log(const char *level,
 885                                      struct device *dev,
 886                                      struct hdmi_audio_infoframe *frame)
 887 {
 888         hdmi_infoframe_log_header(level, dev,
 889                                   (struct hdmi_any_infoframe *)frame);
 890
 891         if (frame->channels)
 892                 hdmi_log("    channels: %u\n", frame->channels - 1);
 893         else
 894                 hdmi_log("    channels: Refer to stream header\n");
 895         hdmi_log("    coding type: %s\n",
 896                         hdmi_audio_coding_type_get_name(frame->coding_type));
 897         hdmi_log("    sample size: %s\n",
 898                         hdmi_audio_sample_size_get_name(frame->sample_size));
 899         hdmi_log("    sample frequency: %s\n",
 900                         hdmi_audio_sample_frequency_get_name(frame->sample_frequency));
 901         hdmi_log("    coding type ext: %s\n",
 902                         hdmi_audio_coding_type_ext_get_name(frame->coding_type_ext));
 903         hdmi_log("    channel allocation: 0x%x\n",
 904                         frame->channel_allocation);
 905         hdmi_log("    level shift value: %u dB\n",
 906                         frame->level_shift_value);
 907         hdmi_log("    downmix inhibit: %s\n",
 908                         frame->downmix_inhibit ? "Yes" : "No");
 909 }
 910
 911 static const char *
 912 hdmi_3d_structure_get_name(enum hdmi_3d_structure s3d_struct)
 913 {
 914         if (s3d_struct < 0 || s3d_struct > 0xf)
 915                 return "Invalid";
 916
 917         switch (s3d_struct) {
 918         case HDMI_3D_STRUCTURE_FRAME_PACKING:
 919                 return "Frame Packing";
 920         case HDMI_3D_STRUCTURE_FIELD_ALTERNATIVE:
 921                 return "Field Alternative";
 922         case HDMI_3D_STRUCTURE_LINE_ALTERNATIVE:
 923                 return "Line Alternative";
 924         case HDMI_3D_STRUCTURE_SIDE_BY_SIDE_FULL:
 925                 return "Side-by-side (Full)";
 926         case HDMI_3D_STRUCTURE_L_DEPTH:
 927                 return "L + Depth";
 928         case HDMI_3D_STRUCTURE_L_DEPTH_GFX_GFX_DEPTH:
 929                 return "L + Depth + Graphics + Graphics-depth";
 930         case HDMI_3D_STRUCTURE_TOP_AND_BOTTOM:
 931                 return "Top-and-Bottom";
 932         case HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF:
 933                 return "Side-by-side (Half)";
 934         default:
 935                 break;
 936         }
 937         return "Reserved";
 938 }
 939
 940 /**
 941  * hdmi_vendor_infoframe_log() - log info of HDMI VENDOR infoframe
 942  * @level: logging level
 943  * @dev: device
 944  * @frame: HDMI VENDOR infoframe
 945  */
 946 static void
 947 hdmi_vendor_any_infoframe_log(const char *level,
 948                               struct device *dev,
 949                               union hdmi_vendor_any_infoframe *frame)
 950 {
 951         struct hdmi_vendor_infoframe *hvf = &frame->hdmi;
 952
 953         hdmi_infoframe_log_header(level, dev,
 954                                   (struct hdmi_any_infoframe *)frame);
 955
 956         if (frame->any.oui != HDMI_IEEE_OUI) {
 957                 hdmi_log("    not a HDMI vendor infoframe\n");
 958                 return;
 959         }
 960         if (hvf->vic == 0 && hvf->s3d_struct == HDMI_3D_STRUCTURE_INVALID) {
 961                 hdmi_log("    empty frame\n");
 962                 return;
 963         }
 964
 965         if (hvf->vic)
 966                 hdmi_log("    HDMI VIC: %u\n", hvf->vic);
 967         if (hvf->s3d_struct != HDMI_3D_STRUCTURE_INVALID) {
 968                 hdmi_log("    3D structure: %s\n",
 969                                 hdmi_3d_structure_get_name(hvf->s3d_struct));
 970                 if (hvf->s3d_struct >= HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF)
 971                         hdmi_log("    3D extension data: %d\n",
 972                                         hvf->s3d_ext_data);
 973         }
 974 }
 975
 976 /**
 977  * hdmi_infoframe_log() - log info of HDMI infoframe
 978  * @level: logging level
 979  * @dev: device
 980  * @frame: HDMI infoframe
 981  */
 982 void hdmi_infoframe_log(const char *level,
 983                         struct device *dev,
 984                         union hdmi_infoframe *frame)
 985 {
 986         switch (frame->any.type) {
 987         case HDMI_INFOFRAME_TYPE_AVI:
 988                 hdmi_avi_infoframe_log(level, dev, &frame->avi);
 989                 break;
 990         case HDMI_INFOFRAME_TYPE_SPD:
 991                 hdmi_spd_infoframe_log(level, dev, &frame->spd);
 992                 break;
 993         case HDMI_INFOFRAME_TYPE_AUDIO:
 994                 hdmi_audio_infoframe_log(level, dev, &frame->audio);
 995                 break;
 996         case HDMI_INFOFRAME_TYPE_VENDOR:
 997                 hdmi_vendor_any_infoframe_log(level, dev, &frame->vendor);
 998                 break;
 999         }
1000 }
1001 EXPORT_SYMBOL(hdmi_infoframe_log);
1002
1003 /**
1004  * hdmi_avi_infoframe_unpack() - unpack binary buffer to a HDMI AVI infoframe
1005  * @buffer: source buffer
1006  * @frame: HDMI AVI infoframe
1007  *
1008  * Unpacks the information contained in binary @buffer into a structured
1009  * @frame of the HDMI Auxiliary Video (AVI) information frame.
1010  * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
1011  * specification.
1012  *
1013  * Returns 0 on success or a negative error code on failure.
1014  */
1015 static int hdmi_avi_infoframe_unpack(struct hdmi_avi_infoframe *frame,
1016                                      void *buffer)
1017 {
1018         u8 *ptr = buffer;
1019         int ret;
1020
1021         if (ptr[0] != HDMI_INFOFRAME_TYPE_AVI ||
1022             ptr[1] != 2 ||
1023             ptr[2] != HDMI_AVI_INFOFRAME_SIZE)
1024                 return -EINVAL;
1025
1026         if (hdmi_infoframe_checksum(buffer, HDMI_INFOFRAME_SIZE(AVI)) != 0)
1027                 return -EINVAL;
1028
1029         ret = hdmi_avi_infoframe_init(frame);
1030         if (ret)
1031                 return ret;
1032
1033         ptr += HDMI_INFOFRAME_HEADER_SIZE;
1034
1035         frame->colorspace = (ptr[0] >> 5) & 0x3;
1036         if (ptr[0] & 0x10)
1037                 frame->active_aspect = ptr[1] & 0xf;
1038         if (ptr[0] & 0x8) {
1039                 frame->top_bar = (ptr[5] << 8) + ptr[6];
1040                 frame->bottom_bar = (ptr[7] << 8) + ptr[8];
1041         }
1042         if (ptr[0] & 0x4) {
1043                 frame->left_bar = (ptr[9] << 8) + ptr[10];
1044                 frame->right_bar = (ptr[11] << 8) + ptr[12];
1045         }
1046         frame->scan_mode = ptr[0] & 0x3;
1047
1048         frame->colorimetry = (ptr[1] >> 6) & 0x3;
1049         frame->picture_aspect = (ptr[1] >> 4) & 0x3;
1050         frame->active_aspect = ptr[1] & 0xf;
1051
1052         frame->itc = ptr[2] & 0x80 ? true : false;
1053         frame->extended_colorimetry = (ptr[2] >> 4) & 0x7;
1054         frame->quantization_range = (ptr[2] >> 2) & 0x3;
1055         frame->nups = ptr[2] & 0x3;
1056
1057         frame->video_code = ptr[3] & 0x7f;
1058         frame->ycc_quantization_range = (ptr[4] >> 6) & 0x3;
1059         frame->content_type = (ptr[4] >> 4) & 0x3;
1060
1061         frame->pixel_repeat = ptr[4] & 0xf;
1062
1063         return 0;
1064 }
1065
1066 /**
1067  * hdmi_spd_infoframe_unpack() - unpack binary buffer to a HDMI SPD infoframe
1068  * @buffer: source buffer
1069  * @frame: HDMI SPD infoframe
1070  *
1071  * Unpacks the information contained in binary @buffer into a structured
1072  * @frame of the HDMI Source Product Description (SPD) information frame.
1073  * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
1074  * specification.
1075  *
1076  * Returns 0 on success or a negative error code on failure.
1077  */
1078 static int hdmi_spd_infoframe_unpack(struct hdmi_spd_infoframe *frame,
1079                                      void *buffer)
1080 {
1081         u8 *ptr = buffer;
1082         int ret;
1083
1084         if (ptr[0] != HDMI_INFOFRAME_TYPE_SPD ||
1085             ptr[1] != 1 ||
1086             ptr[2] != HDMI_SPD_INFOFRAME_SIZE) {
1087                 return -EINVAL;
1088         }
1089
1090         if (hdmi_infoframe_checksum(buffer, HDMI_INFOFRAME_SIZE(SPD)) != 0)
1091                 return -EINVAL;
1092
1093         ptr += HDMI_INFOFRAME_HEADER_SIZE;
1094
1095         ret = hdmi_spd_infoframe_init(frame, ptr, ptr + 8);
1096         if (ret)
1097                 return ret;
1098
1099         frame->sdi = ptr[24];
1100
1101         return 0;
1102 }
1103
1104 /**
1105  * hdmi_audio_infoframe_unpack() - unpack binary buffer to a HDMI AUDIO infoframe
1106  * @buffer: source buffer
1107  * @frame: HDMI Audio infoframe
1108  *
1109  * Unpacks the information contained in binary @buffer into a structured
1110  * @frame of the HDMI Audio information frame.
1111  * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
1112  * specification.
1113  *
1114  * Returns 0 on success or a negative error code on failure.
1115  */
1116 static int hdmi_audio_infoframe_unpack(struct hdmi_audio_infoframe *frame,
1117                                        void *buffer)
1118 {
1119         u8 *ptr = buffer;
1120         int ret;
1121
1122         if (ptr[0] != HDMI_INFOFRAME_TYPE_AUDIO ||
1123             ptr[1] != 1 ||
1124             ptr[2] != HDMI_AUDIO_INFOFRAME_SIZE) {
1125                 return -EINVAL;
1126         }
1127
1128         if (hdmi_infoframe_checksum(buffer, HDMI_INFOFRAME_SIZE(AUDIO)) != 0)
1129                 return -EINVAL;
1130
1131         ret = hdmi_audio_infoframe_init(frame);
1132         if (ret)
1133                 return ret;
1134
1135         ptr += HDMI_INFOFRAME_HEADER_SIZE;
1136
1137         frame->channels = ptr[0] & 0x7;
1138         frame->coding_type = (ptr[0] >> 4) & 0xf;
1139         frame->sample_size = ptr[1] & 0x3;
1140         frame->sample_frequency = (ptr[1] >> 2) & 0x7;
1141         frame->coding_type_ext = ptr[2] & 0x1f;
1142         frame->channel_allocation = ptr[3];
1143         frame->level_shift_value = (ptr[4] >> 3) & 0xf;
1144         frame->downmix_inhibit = ptr[4] & 0x80 ? true : false;
1145
1146         return 0;
1147 }
1148
1149 /**
1150  * hdmi_vendor_infoframe_unpack() - unpack binary buffer to a HDMI vendor infoframe
1151  * @buffer: source buffer
1152  * @frame: HDMI Vendor infoframe
1153  *
1154  * Unpacks the information contained in binary @buffer into a structured
1155  * @frame of the HDMI Vendor information frame.
1156  * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
1157  * specification.
1158  *
1159  * Returns 0 on success or a negative error code on failure.
1160  */
1161 static int
1162 hdmi_vendor_any_infoframe_unpack(union hdmi_vendor_any_infoframe *frame,
1163                                  void *buffer)
1164 {
1165         u8 *ptr = buffer;
1166         size_t length;
1167         int ret;
1168         u8 hdmi_video_format;
1169         struct hdmi_vendor_infoframe *hvf = &frame->hdmi;
1170
1171         if (ptr[0] != HDMI_INFOFRAME_TYPE_VENDOR ||
1172             ptr[1] != 1 ||
1173             (ptr[2] != 4 && ptr[2] != 5 && ptr[2] != 6))
1174                 return -EINVAL;
1175
1176         length = ptr[2];
1177
1178         if (hdmi_infoframe_checksum(buffer,
1179                                     HDMI_INFOFRAME_HEADER_SIZE + length) != 0)
1180                 return -EINVAL;
1181
1182         ptr += HDMI_INFOFRAME_HEADER_SIZE;
1183
1184         /* HDMI OUI */
1185         if ((ptr[0] != 0x03) ||
1186             (ptr[1] != 0x0c) ||
1187             (ptr[2] != 0x00))
1188                 return -EINVAL;
1189
1190         hdmi_video_format = ptr[3] >> 5;
1191
1192         if (hdmi_video_format > 0x2)
1193                 return -EINVAL;
1194
1195         ret = hdmi_vendor_infoframe_init(hvf);
1196         if (ret)
1197                 return ret;
1198
1199         hvf->length = length;
1200
1201         if (hdmi_video_format == 0x2) {
1202                 if (length != 5 && length != 6)
1203                         return -EINVAL;
1204                 hvf->s3d_struct = ptr[4] >> 4;
1205                 if (hvf->s3d_struct >= HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF) {
1206                         if (length != 6)
1207                                 return -EINVAL;
1208                         hvf->s3d_ext_data = ptr[5] >> 4;
1209                 }
1210         } else if (hdmi_video_format == 0x1) {
1211                 if (length != 5)
1212                         return -EINVAL;
1213                 hvf->vic = ptr[4];
1214         } else {
1215                 if (length != 4)
1216                         return -EINVAL;
1217         }
1218
1219         return 0;
1220 }
1221
1222 /**
1223  * hdmi_infoframe_unpack() - unpack binary buffer to a HDMI infoframe
1224  * @buffer: source buffer
1225  * @frame: HDMI infoframe
1226  *
1227  * Unpacks the information contained in binary buffer @buffer into a structured
1228  * @frame of a HDMI infoframe.
1229  * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
1230  * specification.
1231  *
1232  * Returns 0 on success or a negative error code on failure.
1233  */
1234 int hdmi_infoframe_unpack(union hdmi_infoframe *frame, void *buffer)
1235 {
1236         int ret;
1237         u8 *ptr = buffer;
1238
1239         switch (ptr[0]) {
1240         case HDMI_INFOFRAME_TYPE_AVI:
1241                 ret = hdmi_avi_infoframe_unpack(&frame->avi, buffer);
1242                 break;
1243         case HDMI_INFOFRAME_TYPE_SPD:
1244                 ret = hdmi_spd_infoframe_unpack(&frame->spd, buffer);
1245                 break;
1246         case HDMI_INFOFRAME_TYPE_AUDIO:
1247                 ret = hdmi_audio_infoframe_unpack(&frame->audio, buffer);
1248                 break;
1249         case HDMI_INFOFRAME_TYPE_VENDOR:
1250                 ret = hdmi_vendor_any_infoframe_unpack(&frame->vendor, buffer);
1251                 break;
1252         default:
1253                 ret = -EINVAL;
1254                 break;
1255         }
1256
1257         return ret;
1258 }
1259 EXPORT_SYMBOL(hdmi_infoframe_unpack);