drivers/media/platform/soc_camera/soc_mediabus.c

   1 /*
   2  * soc-camera media bus helper routines
   3  *
   4  * Copyright (C) 2009, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13
  14 #include <media/v4l2-device.h>
  15 #include <media/v4l2-mediabus.h>
  16 #include <media/drv-intf/soc_mediabus.h>
  17
  18 static const struct soc_mbus_lookup mbus_fmt[] = {
  19 {
  20         .code = MEDIA_BUS_FMT_YUYV8_2X8,
  21         .fmt = {
  22                 .fourcc                 = V4L2_PIX_FMT_YUYV,
  23                 .name                   = "YUYV",
  24                 .bits_per_sample        = 8,
  25                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
  26                 .order                  = SOC_MBUS_ORDER_LE,
  27                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
  28         },
  29 }, {
  30         .code = MEDIA_BUS_FMT_YVYU8_2X8,
  31         .fmt = {
  32                 .fourcc                 = V4L2_PIX_FMT_YVYU,
  33                 .name                   = "YVYU",
  34                 .bits_per_sample        = 8,
  35                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
  36                 .order                  = SOC_MBUS_ORDER_LE,
  37                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
  38         },
  39 }, {
  40         .code = MEDIA_BUS_FMT_UYVY8_2X8,
  41         .fmt = {
  42                 .fourcc                 = V4L2_PIX_FMT_UYVY,
  43                 .name                   = "UYVY",
  44                 .bits_per_sample        = 8,
  45                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
  46                 .order                  = SOC_MBUS_ORDER_LE,
  47                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
  48         },
  49 }, {
  50         .code = MEDIA_BUS_FMT_VYUY8_2X8,
  51         .fmt = {
  52                 .fourcc                 = V4L2_PIX_FMT_VYUY,
  53                 .name                   = "VYUY",
  54                 .bits_per_sample        = 8,
  55                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
  56                 .order                  = SOC_MBUS_ORDER_LE,
  57                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
  58         },
  59 }, {
  60         .code = MEDIA_BUS_FMT_RGB555_2X8_PADHI_LE,
  61         .fmt = {
  62                 .fourcc                 = V4L2_PIX_FMT_RGB555,
  63                 .name                   = "RGB555",
  64                 .bits_per_sample        = 8,
  65                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
  66                 .order                  = SOC_MBUS_ORDER_LE,
  67                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
  68         },
  69 }, {
  70         .code = MEDIA_BUS_FMT_RGB555_2X8_PADHI_BE,
  71         .fmt = {
  72                 .fourcc                 = V4L2_PIX_FMT_RGB555X,
  73                 .name                   = "RGB555X",
  74                 .bits_per_sample        = 8,
  75                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
  76                 .order                  = SOC_MBUS_ORDER_BE,
  77                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
  78         },
  79 }, {
  80         .code = MEDIA_BUS_FMT_RGB565_2X8_LE,
  81         .fmt = {
  82                 .fourcc                 = V4L2_PIX_FMT_RGB565,
  83                 .name                   = "RGB565",
  84                 .bits_per_sample        = 8,
  85                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
  86                 .order                  = SOC_MBUS_ORDER_LE,
  87                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
  88         },
  89 }, {
  90         .code = MEDIA_BUS_FMT_RGB565_2X8_BE,
  91         .fmt = {
  92                 .fourcc                 = V4L2_PIX_FMT_RGB565X,
  93                 .name                   = "RGB565X",
  94                 .bits_per_sample        = 8,
  95                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
  96                 .order                  = SOC_MBUS_ORDER_BE,
  97                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
  98         },
  99 }, {
 100         .code = MEDIA_BUS_FMT_RGB666_1X18,
 101         .fmt = {
 102                 .fourcc                 = V4L2_PIX_FMT_RGB32,
 103                 .name                   = "RGB666/32bpp",
 104                 .bits_per_sample        = 18,
 105                 .packing                = SOC_MBUS_PACKING_EXTEND32,
 106                 .order                  = SOC_MBUS_ORDER_LE,
 107         },
 108 }, {
 109         .code = MEDIA_BUS_FMT_RGB888_1X24,
 110         .fmt = {
 111                 .fourcc                 = V4L2_PIX_FMT_RGB32,
 112                 .name                   = "RGB888/32bpp",
 113                 .bits_per_sample        = 24,
 114                 .packing                = SOC_MBUS_PACKING_EXTEND32,
 115                 .order                  = SOC_MBUS_ORDER_LE,
 116         },
 117 }, {
 118         .code = MEDIA_BUS_FMT_RGB888_2X12_BE,
 119         .fmt = {
 120                 .fourcc                 = V4L2_PIX_FMT_RGB32,
 121                 .name                   = "RGB888/32bpp",
 122                 .bits_per_sample        = 12,
 123                 .packing                = SOC_MBUS_PACKING_EXTEND32,
 124                 .order                  = SOC_MBUS_ORDER_BE,
 125         },
 126 }, {
 127         .code = MEDIA_BUS_FMT_RGB888_2X12_LE,
 128         .fmt = {
 129                 .fourcc                 = V4L2_PIX_FMT_RGB32,
 130                 .name                   = "RGB888/32bpp",
 131                 .bits_per_sample        = 12,
 132                 .packing                = SOC_MBUS_PACKING_EXTEND32,
 133                 .order                  = SOC_MBUS_ORDER_LE,
 134         },
 135 }, {
 136         .code = MEDIA_BUS_FMT_SBGGR8_1X8,
 137         .fmt = {
 138                 .fourcc                 = V4L2_PIX_FMT_SBGGR8,
 139                 .name                   = "Bayer 8 BGGR",
 140                 .bits_per_sample        = 8,
 141                 .packing                = SOC_MBUS_PACKING_NONE,
 142                 .order                  = SOC_MBUS_ORDER_LE,
 143                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
 144         },
 145 }, {
 146         .code = MEDIA_BUS_FMT_SBGGR10_1X10,
 147         .fmt = {
 148                 .fourcc                 = V4L2_PIX_FMT_SBGGR10,
 149                 .name                   = "Bayer 10 BGGR",
 150                 .bits_per_sample        = 10,
 151                 .packing                = SOC_MBUS_PACKING_EXTEND16,
 152                 .order                  = SOC_MBUS_ORDER_LE,
 153                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
 154         },
 155 }, {
 156         .code = MEDIA_BUS_FMT_Y8_1X8,
 157         .fmt = {
 158                 .fourcc                 = V4L2_PIX_FMT_GREY,
 159                 .name                   = "Grey",
 160                 .bits_per_sample        = 8,
 161                 .packing                = SOC_MBUS_PACKING_NONE,
 162                 .order                  = SOC_MBUS_ORDER_LE,
 163                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
 164         },
 165 }, {
 166         .code = MEDIA_BUS_FMT_Y10_1X10,
 167         .fmt = {
 168                 .fourcc                 = V4L2_PIX_FMT_Y10,
 169                 .name                   = "Grey 10bit",
 170                 .bits_per_sample        = 10,
 171                 .packing                = SOC_MBUS_PACKING_EXTEND16,
 172                 .order                  = SOC_MBUS_ORDER_LE,
 173                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
 174         },
 175 }, {
 176         .code = MEDIA_BUS_FMT_SBGGR10_2X8_PADHI_LE,
 177         .fmt = {
 178                 .fourcc                 = V4L2_PIX_FMT_SBGGR10,
 179                 .name                   = "Bayer 10 BGGR",
 180                 .bits_per_sample        = 8,
 181                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
 182                 .order                  = SOC_MBUS_ORDER_LE,
 183                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
 184         },
 185 }, {
 186         .code = MEDIA_BUS_FMT_SBGGR10_2X8_PADLO_LE,
 187         .fmt = {
 188                 .fourcc                 = V4L2_PIX_FMT_SBGGR10,
 189                 .name                   = "Bayer 10 BGGR",
 190                 .bits_per_sample        = 8,
 191                 .packing                = SOC_MBUS_PACKING_2X8_PADLO,
 192                 .order                  = SOC_MBUS_ORDER_LE,
 193                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
 194         },
 195 }, {
 196         .code = MEDIA_BUS_FMT_SBGGR10_2X8_PADHI_BE,
 197         .fmt = {
 198                 .fourcc                 = V4L2_PIX_FMT_SBGGR10,
 199                 .name                   = "Bayer 10 BGGR",
 200                 .bits_per_sample        = 8,
 201                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
 202                 .order                  = SOC_MBUS_ORDER_BE,
 203                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
 204         },
 205 }, {
 206         .code = MEDIA_BUS_FMT_SBGGR10_2X8_PADLO_BE,
 207         .fmt = {
 208                 .fourcc                 = V4L2_PIX_FMT_SBGGR10,
 209                 .name                   = "Bayer 10 BGGR",
 210                 .bits_per_sample        = 8,
 211                 .packing                = SOC_MBUS_PACKING_2X8_PADLO,
 212                 .order                  = SOC_MBUS_ORDER_BE,
 213                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
 214         },
 215 }, {
 216         .code = MEDIA_BUS_FMT_JPEG_1X8,
 217         .fmt = {
 218                 .fourcc                 = V4L2_PIX_FMT_JPEG,
 219                 .name                   = "JPEG",
 220                 .bits_per_sample        = 8,
 221                 .packing                = SOC_MBUS_PACKING_VARIABLE,
 222                 .order                  = SOC_MBUS_ORDER_LE,
 223                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
 224         },
 225 }, {
 226         .code = MEDIA_BUS_FMT_RGB444_2X8_PADHI_BE,
 227         .fmt = {
 228                 .fourcc                 = V4L2_PIX_FMT_RGB444,
 229                 .name                   = "RGB444",
 230                 .bits_per_sample        = 8,
 231                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
 232                 .order                  = SOC_MBUS_ORDER_BE,
 233                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
 234         },
 235 }, {
 236         .code = MEDIA_BUS_FMT_YUYV8_1_5X8,
 237         .fmt = {
 238                 .fourcc                 = V4L2_PIX_FMT_YUV420,
 239                 .name                   = "YUYV 4:2:0",
 240                 .bits_per_sample        = 8,
 241                 .packing                = SOC_MBUS_PACKING_1_5X8,
 242                 .order                  = SOC_MBUS_ORDER_LE,
 243                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
 244         },
 245 }, {
 246         .code = MEDIA_BUS_FMT_YVYU8_1_5X8,
 247         .fmt = {
 248                 .fourcc                 = V4L2_PIX_FMT_YVU420,
 249                 .name                   = "YVYU 4:2:0",
 250                 .bits_per_sample        = 8,
 251                 .packing                = SOC_MBUS_PACKING_1_5X8,
 252                 .order                  = SOC_MBUS_ORDER_LE,
 253                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
 254         },
 255 }, {
 256         .code = MEDIA_BUS_FMT_UYVY8_1X16,
 257         .fmt = {
 258                 .fourcc                 = V4L2_PIX_FMT_UYVY,
 259                 .name                   = "UYVY 16bit",
 260                 .bits_per_sample        = 16,
 261                 .packing                = SOC_MBUS_PACKING_EXTEND16,
 262                 .order                  = SOC_MBUS_ORDER_LE,
 263                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
 264         },
 265 }, {
 266         .code = MEDIA_BUS_FMT_VYUY8_1X16,
 267         .fmt = {
 268                 .fourcc                 = V4L2_PIX_FMT_VYUY,
 269                 .name                   = "VYUY 16bit",
 270                 .bits_per_sample        = 16,
 271                 .packing                = SOC_MBUS_PACKING_EXTEND16,
 272                 .order                  = SOC_MBUS_ORDER_LE,
 273                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
 274         },
 275 }, {
 276         .code = MEDIA_BUS_FMT_YUYV8_1X16,
 277         .fmt = {
 278                 .fourcc                 = V4L2_PIX_FMT_YUYV,
 279                 .name                   = "YUYV 16bit",
 280                 .bits_per_sample        = 16,
 281                 .packing                = SOC_MBUS_PACKING_EXTEND16,
 282                 .order                  = SOC_MBUS_ORDER_LE,
 283                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
 284         },
 285 }, {
 286         .code = MEDIA_BUS_FMT_YVYU8_1X16,
 287         .fmt = {
 288                 .fourcc                 = V4L2_PIX_FMT_YVYU,
 289                 .name                   = "YVYU 16bit",
 290                 .bits_per_sample        = 16,
 291                 .packing                = SOC_MBUS_PACKING_EXTEND16,
 292                 .order                  = SOC_MBUS_ORDER_LE,
 293                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
 294         },
 295 }, {
 296         .code = MEDIA_BUS_FMT_SGRBG8_1X8,
 297         .fmt = {
 298                 .fourcc                 = V4L2_PIX_FMT_SGRBG8,
 299                 .name                   = "Bayer 8 GRBG",
 300                 .bits_per_sample        = 8,
 301                 .packing                = SOC_MBUS_PACKING_NONE,
 302                 .order                  = SOC_MBUS_ORDER_LE,
 303                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
 304         },
 305 }, {
 306         .code = MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8,
 307         .fmt = {
 308                 .fourcc                 = V4L2_PIX_FMT_SGRBG10DPCM8,
 309                 .name                   = "Bayer 10 BGGR DPCM 8",
 310                 .bits_per_sample        = 8,
 311                 .packing                = SOC_MBUS_PACKING_NONE,
 312                 .order                  = SOC_MBUS_ORDER_LE,
 313                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
 314         },
 315 }, {
 316         .code = MEDIA_BUS_FMT_SGBRG10_1X10,
 317         .fmt = {
 318                 .fourcc                 = V4L2_PIX_FMT_SGBRG10,
 319                 .name                   = "Bayer 10 GBRG",
 320                 .bits_per_sample        = 10,
 321                 .packing                = SOC_MBUS_PACKING_EXTEND16,
 322                 .order                  = SOC_MBUS_ORDER_LE,
 323                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
 324         },
 325 }, {
 326         .code = MEDIA_BUS_FMT_SGRBG10_1X10,
 327         .fmt = {
 328                 .fourcc                 = V4L2_PIX_FMT_SGRBG10,
 329                 .name                   = "Bayer 10 GRBG",
 330                 .bits_per_sample        = 10,
 331                 .packing                = SOC_MBUS_PACKING_EXTEND16,
 332                 .order                  = SOC_MBUS_ORDER_LE,
 333                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
 334         },
 335 }, {
 336         .code = MEDIA_BUS_FMT_SRGGB10_1X10,
 337         .fmt = {
 338                 .fourcc                 = V4L2_PIX_FMT_SRGGB10,
 339                 .name                   = "Bayer 10 RGGB",
 340                 .bits_per_sample        = 10,
 341                 .packing                = SOC_MBUS_PACKING_EXTEND16,
 342                 .order                  = SOC_MBUS_ORDER_LE,
 343                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
 344         },
 345 }, {
 346         .code = MEDIA_BUS_FMT_SBGGR12_1X12,
 347         .fmt = {
 348                 .fourcc                 = V4L2_PIX_FMT_SBGGR12,
 349                 .name                   = "Bayer 12 BGGR",
 350                 .bits_per_sample        = 12,
 351                 .packing                = SOC_MBUS_PACKING_EXTEND16,
 352                 .order                  = SOC_MBUS_ORDER_LE,
 353                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
 354         },
 355 }, {
 356         .code = MEDIA_BUS_FMT_SGBRG12_1X12,
 357         .fmt = {
 358                 .fourcc                 = V4L2_PIX_FMT_SGBRG12,
 359                 .name                   = "Bayer 12 GBRG",
 360                 .bits_per_sample        = 12,
 361                 .packing                = SOC_MBUS_PACKING_EXTEND16,
 362                 .order                  = SOC_MBUS_ORDER_LE,
 363                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
 364         },
 365 }, {
 366         .code = MEDIA_BUS_FMT_SGRBG12_1X12,
 367         .fmt = {
 368                 .fourcc                 = V4L2_PIX_FMT_SGRBG12,
 369                 .name                   = "Bayer 12 GRBG",
 370                 .bits_per_sample        = 12,
 371                 .packing                = SOC_MBUS_PACKING_EXTEND16,
 372                 .order                  = SOC_MBUS_ORDER_LE,
 373                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
 374         },
 375 }, {
 376         .code = MEDIA_BUS_FMT_SRGGB12_1X12,
 377         .fmt = {
 378                 .fourcc                 = V4L2_PIX_FMT_SRGGB12,
 379                 .name                   = "Bayer 12 RGGB",
 380                 .bits_per_sample        = 12,
 381                 .packing                = SOC_MBUS_PACKING_EXTEND16,
 382                 .order                  = SOC_MBUS_ORDER_LE,
 383                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
 384         },
 385 },
 386 };
 387
 388 int soc_mbus_samples_per_pixel(const struct soc_mbus_pixelfmt *mf,
 389                         unsigned int *numerator, unsigned int *denominator)
 390 {
 391         switch (mf->packing) {
 392         case SOC_MBUS_PACKING_NONE:
 393         case SOC_MBUS_PACKING_EXTEND16:
 394                 *numerator = 1;
 395                 *denominator = 1;
 396                 return 0;
 397         case SOC_MBUS_PACKING_EXTEND32:
 398                 *numerator = 1;
 399                 *denominator = 1;
 400                 return 0;
 401         case SOC_MBUS_PACKING_2X8_PADHI:
 402         case SOC_MBUS_PACKING_2X8_PADLO:
 403                 *numerator = 2;
 404                 *denominator = 1;
 405                 return 0;
 406         case SOC_MBUS_PACKING_1_5X8:
 407                 *numerator = 3;
 408                 *denominator = 2;
 409                 return 0;
 410         case SOC_MBUS_PACKING_VARIABLE:
 411                 *numerator = 0;
 412                 *denominator = 1;
 413                 return 0;
 414         }
 415         return -EINVAL;
 416 }
 417 EXPORT_SYMBOL(soc_mbus_samples_per_pixel);
 418
 419 s32 soc_mbus_bytes_per_line(u32 width, const struct soc_mbus_pixelfmt *mf)
 420 {
 421         if (mf->layout != SOC_MBUS_LAYOUT_PACKED)
 422                 return width * mf->bits_per_sample / 8;
 423
 424         switch (mf->packing) {
 425         case SOC_MBUS_PACKING_NONE:
 426                 return width * mf->bits_per_sample / 8;
 427         case SOC_MBUS_PACKING_2X8_PADHI:
 428         case SOC_MBUS_PACKING_2X8_PADLO:
 429         case SOC_MBUS_PACKING_EXTEND16:
 430                 return width * 2;
 431         case SOC_MBUS_PACKING_1_5X8:
 432                 return width * 3 / 2;
 433         case SOC_MBUS_PACKING_VARIABLE:
 434                 return 0;
 435         case SOC_MBUS_PACKING_EXTEND32:
 436                 return width * 4;
 437         }
 438         return -EINVAL;
 439 }
 440 EXPORT_SYMBOL(soc_mbus_bytes_per_line);
 441
 442 s32 soc_mbus_image_size(const struct soc_mbus_pixelfmt *mf,
 443                         u32 bytes_per_line, u32 height)
 444 {
 445         if (mf->layout == SOC_MBUS_LAYOUT_PACKED)
 446                 return bytes_per_line * height;
 447
 448         switch (mf->packing) {
 449         case SOC_MBUS_PACKING_2X8_PADHI:
 450         case SOC_MBUS_PACKING_2X8_PADLO:
 451                 return bytes_per_line * height * 2;
 452         case SOC_MBUS_PACKING_1_5X8:
 453                 return bytes_per_line * height * 3 / 2;
 454         default:
 455                 return -EINVAL;
 456         }
 457 }
 458 EXPORT_SYMBOL(soc_mbus_image_size);
 459
 460 const struct soc_mbus_pixelfmt *soc_mbus_find_fmtdesc(
 461         u32 code,
 462         const struct soc_mbus_lookup *lookup,
 463         int n)
 464 {
 465         int i;
 466
 467         for (i = 0; i < n; i++)
 468                 if (lookup[i].code == code)
 469                         return &lookup[i].fmt;
 470
 471         return NULL;
 472 }
 473 EXPORT_SYMBOL(soc_mbus_find_fmtdesc);
 474
 475 const struct soc_mbus_pixelfmt *soc_mbus_get_fmtdesc(
 476         u32 code)
 477 {
 478         return soc_mbus_find_fmtdesc(code, mbus_fmt, ARRAY_SIZE(mbus_fmt));
 479 }
 480 EXPORT_SYMBOL(soc_mbus_get_fmtdesc);
 481
 482 unsigned int soc_mbus_config_compatible(const struct v4l2_mbus_config *cfg,
 483                                         unsigned int flags)
 484 {
 485         unsigned long common_flags;
 486         bool hsync = true, vsync = true, pclk, data, mode;
 487         bool mipi_lanes, mipi_clock;
 488
 489         common_flags = cfg->flags & flags;
 490
 491         switch (cfg->type) {
 492         case V4L2_MBUS_PARALLEL:
 493                 hsync = common_flags & (V4L2_MBUS_HSYNC_ACTIVE_HIGH |
 494                                         V4L2_MBUS_HSYNC_ACTIVE_LOW);
 495                 vsync = common_flags & (V4L2_MBUS_VSYNC_ACTIVE_HIGH |
 496                                         V4L2_MBUS_VSYNC_ACTIVE_LOW);
 497                 /* fall through */
 498         case V4L2_MBUS_BT656:
 499                 pclk = common_flags & (V4L2_MBUS_PCLK_SAMPLE_RISING |
 500                                        V4L2_MBUS_PCLK_SAMPLE_FALLING);
 501                 data = common_flags & (V4L2_MBUS_DATA_ACTIVE_HIGH |
 502                                        V4L2_MBUS_DATA_ACTIVE_LOW);
 503                 mode = common_flags & (V4L2_MBUS_MASTER | V4L2_MBUS_SLAVE);
 504                 return (!hsync || !vsync || !pclk || !data || !mode) ?
 505                         0 : common_flags;
 506         case V4L2_MBUS_CSI2:
 507                 mipi_lanes = common_flags & V4L2_MBUS_CSI2_LANES;
 508                 mipi_clock = common_flags & (V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK |
 509                                              V4L2_MBUS_CSI2_CONTINUOUS_CLOCK);
 510                 return (!mipi_lanes || !mipi_clock) ? 0 : common_flags;
 511         default:
 512                 WARN_ON(1);
 513                 return -EINVAL;
 514         }
 515         return 0;
 516 }
 517 EXPORT_SYMBOL(soc_mbus_config_compatible);
 518
 519 static int __init soc_mbus_init(void)
 520 {
 521         return 0;
 522 }
 523
 524 static void __exit soc_mbus_exit(void)
 525 {
 526 }
 527
 528 module_init(soc_mbus_init);
 529 module_exit(soc_mbus_exit);
 530
 531 MODULE_DESCRIPTION("soc-camera media bus interface");
 532 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
 533 MODULE_LICENSE("GPL v2");