drivers/media/video/v4l2-common.c

   1 /*
   2  *      Video for Linux Two
   3  *
   4  *      A generic video device interface for the LINUX operating system
   5  *      using a set of device structures/vectors for low level operations.
   6  *
   7  *      This file replaces the videodev.c file that comes with the
   8  *      regular kernel distribution.
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  *
  15  * Author:      Bill Dirks <bill@thedirks.org>
  16  *              based on code by Alan Cox, <alan@cymru.net>
  17  *
  18  */
  19
  20 /*
  21  * Video capture interface for Linux
  22  *
  23  *      A generic video device interface for the LINUX operating system
  24  *      using a set of device structures/vectors for low level operations.
  25  *
  26  *              This program is free software; you can redistribute it and/or
  27  *              modify it under the terms of the GNU General Public License
  28  *              as published by the Free Software Foundation; either version
  29  *              2 of the License, or (at your option) any later version.
  30  *
  31  * Author:      Alan Cox, <alan@redhat.com>
  32  *
  33  * Fixes:
  34  */
  35
  36 /*
  37  * Video4linux 1/2 integration by Justin Schoeman
  38  * <justin@suntiger.ee.up.ac.za>
  39  * 2.4 PROCFS support ported from 2.4 kernels by
  40  *  Iñaki García Etxebarria <garetxe@euskalnet.net>
  41  * Makefile fix by "W. Michael Petullo" <mike@flyn.org>
  42  * 2.4 devfs support ported from 2.4 kernels by
  43  *  Dan Merillat <dan@merillat.org>
  44  * Added Gerd Knorrs v4l1 enhancements (Justin Schoeman)
  45  */
  46
  47 #include <linux/module.h>
  48 #include <linux/types.h>
  49 #include <linux/kernel.h>
  50 #include <linux/mm.h>
  51 #include <linux/string.h>
  52 #include <linux/errno.h>
  53 #include <linux/i2c.h>
  54 #include <asm/uaccess.h>
  55 #include <asm/system.h>
  56 #include <asm/pgtable.h>
  57 #include <asm/io.h>
  58 #include <asm/div64.h>
  59 #define __OLD_VIDIOC_ /* To allow fixing old calls*/
  60 #include <media/v4l2-common.h>
  61 #include <media/v4l2-chip-ident.h>
  62
  63 #ifdef CONFIG_KMOD
  64 #include <linux/kmod.h>
  65 #endif
  66
  67 #include <linux/videodev2.h>
  68
  69 MODULE_AUTHOR("Bill Dirks, Justin Schoeman, Gerd Knorr");
  70 MODULE_DESCRIPTION("misc helper functions for v4l2 device drivers");
  71 MODULE_LICENSE("GPL");
  72
  73 /*
  74  *
  75  *      V 4 L 2   D R I V E R   H E L P E R   A P I
  76  *
  77  */
  78
  79 /*
  80  *  Video Standard Operations (contributed by Michael Schimek)
  81  */
  82
  83
  84 /* ----------------------------------------------------------------- */
  85 /* priority handling                                                 */
  86
  87 #define V4L2_PRIO_VALID(val) (val == V4L2_PRIORITY_BACKGROUND   || \
  88                               val == V4L2_PRIORITY_INTERACTIVE  || \
  89                               val == V4L2_PRIORITY_RECORD)
  90
  91 int v4l2_prio_init(struct v4l2_prio_state *global)
  92 {
  93         memset(global,0,sizeof(*global));
  94         return 0;
  95 }
  96 EXPORT_SYMBOL(v4l2_prio_init);
  97
  98 int v4l2_prio_change(struct v4l2_prio_state *global, enum v4l2_priority *local,
  99                      enum v4l2_priority new)
 100 {
 101         if (!V4L2_PRIO_VALID(new))
 102                 return -EINVAL;
 103         if (*local == new)
 104                 return 0;
 105
 106         atomic_inc(&global->prios[new]);
 107         if (V4L2_PRIO_VALID(*local))
 108                 atomic_dec(&global->prios[*local]);
 109         *local = new;
 110         return 0;
 111 }
 112 EXPORT_SYMBOL(v4l2_prio_change);
 113
 114 int v4l2_prio_open(struct v4l2_prio_state *global, enum v4l2_priority *local)
 115 {
 116         return v4l2_prio_change(global,local,V4L2_PRIORITY_DEFAULT);
 117 }
 118 EXPORT_SYMBOL(v4l2_prio_open);
 119
 120 int v4l2_prio_close(struct v4l2_prio_state *global, enum v4l2_priority *local)
 121 {
 122         if (V4L2_PRIO_VALID(*local))
 123                 atomic_dec(&global->prios[*local]);
 124         return 0;
 125 }
 126 EXPORT_SYMBOL(v4l2_prio_close);
 127
 128 enum v4l2_priority v4l2_prio_max(struct v4l2_prio_state *global)
 129 {
 130         if (atomic_read(&global->prios[V4L2_PRIORITY_RECORD]) > 0)
 131                 return V4L2_PRIORITY_RECORD;
 132         if (atomic_read(&global->prios[V4L2_PRIORITY_INTERACTIVE]) > 0)
 133                 return V4L2_PRIORITY_INTERACTIVE;
 134         if (atomic_read(&global->prios[V4L2_PRIORITY_BACKGROUND]) > 0)
 135                 return V4L2_PRIORITY_BACKGROUND;
 136         return V4L2_PRIORITY_UNSET;
 137 }
 138 EXPORT_SYMBOL(v4l2_prio_max);
 139
 140 int v4l2_prio_check(struct v4l2_prio_state *global, enum v4l2_priority *local)
 141 {
 142         if (*local < v4l2_prio_max(global))
 143                 return -EBUSY;
 144         return 0;
 145 }
 146 EXPORT_SYMBOL(v4l2_prio_check);
 147
 148 /* ----------------------------------------------------------------- */
 149
 150 /* Helper functions for control handling                             */
 151
 152 /* Check for correctness of the ctrl's value based on the data from
 153    struct v4l2_queryctrl and the available menu items. Note that
 154    menu_items may be NULL, in that case it is ignored. */
 155 int v4l2_ctrl_check(struct v4l2_ext_control *ctrl, struct v4l2_queryctrl *qctrl,
 156                 const char **menu_items)
 157 {
 158         if (qctrl->flags & V4L2_CTRL_FLAG_DISABLED)
 159                 return -EINVAL;
 160         if (qctrl->flags & V4L2_CTRL_FLAG_GRABBED)
 161                 return -EBUSY;
 162         if (qctrl->type == V4L2_CTRL_TYPE_BUTTON ||
 163             qctrl->type == V4L2_CTRL_TYPE_INTEGER64 ||
 164             qctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
 165                 return 0;
 166         if (ctrl->value < qctrl->minimum || ctrl->value > qctrl->maximum)
 167                 return -ERANGE;
 168         if (qctrl->type == V4L2_CTRL_TYPE_MENU && menu_items != NULL) {
 169                 if (menu_items[ctrl->value] == NULL ||
 170                     menu_items[ctrl->value][0] == '\0')
 171                         return -EINVAL;
 172         }
 173         return 0;
 174 }
 175 EXPORT_SYMBOL(v4l2_ctrl_check);
 176
 177 /* Returns NULL or a character pointer array containing the menu for
 178    the given control ID. The pointer array ends with a NULL pointer.
 179    An empty string signifies a menu entry that is invalid. This allows
 180    drivers to disable certain options if it is not supported. */
 181 const char **v4l2_ctrl_get_menu(u32 id)
 182 {
 183         static const char *mpeg_audio_sampling_freq[] = {
 184                 "44.1 kHz",
 185                 "48 kHz",
 186                 "32 kHz",
 187                 NULL
 188         };
 189         static const char *mpeg_audio_encoding[] = {
 190                 "MPEG-1/2 Layer I",
 191                 "MPEG-1/2 Layer II",
 192                 "MPEG-1/2 Layer III",
 193                 "MPEG-2/4 AAC",
 194                 "AC-3",
 195                 NULL
 196         };
 197         static const char *mpeg_audio_l1_bitrate[] = {
 198                 "32 kbps",
 199                 "64 kbps",
 200                 "96 kbps",
 201                 "128 kbps",
 202                 "160 kbps",
 203                 "192 kbps",
 204                 "224 kbps",
 205                 "256 kbps",
 206                 "288 kbps",
 207                 "320 kbps",
 208                 "352 kbps",
 209                 "384 kbps",
 210                 "416 kbps",
 211                 "448 kbps",
 212                 NULL
 213         };
 214         static const char *mpeg_audio_l2_bitrate[] = {
 215                 "32 kbps",
 216                 "48 kbps",
 217                 "56 kbps",
 218                 "64 kbps",
 219                 "80 kbps",
 220                 "96 kbps",
 221                 "112 kbps",
 222                 "128 kbps",
 223                 "160 kbps",
 224                 "192 kbps",
 225                 "224 kbps",
 226                 "256 kbps",
 227                 "320 kbps",
 228                 "384 kbps",
 229                 NULL
 230         };
 231         static const char *mpeg_audio_l3_bitrate[] = {
 232                 "32 kbps",
 233                 "40 kbps",
 234                 "48 kbps",
 235                 "56 kbps",
 236                 "64 kbps",
 237                 "80 kbps",
 238                 "96 kbps",
 239                 "112 kbps",
 240                 "128 kbps",
 241                 "160 kbps",
 242                 "192 kbps",
 243                 "224 kbps",
 244                 "256 kbps",
 245                 "320 kbps",
 246                 NULL
 247         };
 248         static const char *mpeg_audio_ac3_bitrate[] = {
 249                 "32 kbps",
 250                 "40 kbps",
 251                 "48 kbps",
 252                 "56 kbps",
 253                 "64 kbps",
 254                 "80 kbps",
 255                 "96 kbps",
 256                 "112 kbps",
 257                 "128 kbps",
 258                 "160 kbps",
 259                 "192 kbps",
 260                 "224 kbps",
 261                 "256 kbps",
 262                 "320 kbps",
 263                 "384 kbps",
 264                 "448 kbps",
 265                 "512 kbps",
 266                 "576 kbps",
 267                 "640 kbps",
 268                 NULL
 269         };
 270         static const char *mpeg_audio_mode[] = {
 271                 "Stereo",
 272                 "Joint Stereo",
 273                 "Dual",
 274                 "Mono",
 275                 NULL
 276         };
 277         static const char *mpeg_audio_mode_extension[] = {
 278                 "Bound 4",
 279                 "Bound 8",
 280                 "Bound 12",
 281                 "Bound 16",
 282                 NULL
 283         };
 284         static const char *mpeg_audio_emphasis[] = {
 285                 "No Emphasis",
 286                 "50/15 us",
 287                 "CCITT J17",
 288                 NULL
 289         };
 290         static const char *mpeg_audio_crc[] = {
 291                 "No CRC",
 292                 "16-bit CRC",
 293                 NULL
 294         };
 295         static const char *mpeg_video_encoding[] = {
 296                 "MPEG-1",
 297                 "MPEG-2",
 298                 "MPEG-4 AVC",
 299                 NULL
 300         };
 301         static const char *mpeg_video_aspect[] = {
 302                 "1x1",
 303                 "4x3",
 304                 "16x9",
 305                 "2.21x1",
 306                 NULL
 307         };
 308         static const char *mpeg_video_bitrate_mode[] = {
 309                 "Variable Bitrate",
 310                 "Constant Bitrate",
 311                 NULL
 312         };
 313         static const char *mpeg_stream_type[] = {
 314                 "MPEG-2 Program Stream",
 315                 "MPEG-2 Transport Stream",
 316                 "MPEG-1 System Stream",
 317                 "MPEG-2 DVD-compatible Stream",
 318                 "MPEG-1 VCD-compatible Stream",
 319                 "MPEG-2 SVCD-compatible Stream",
 320                 NULL
 321         };
 322         static const char *mpeg_stream_vbi_fmt[] = {
 323                 "No VBI",
 324                 "Private packet, IVTV format",
 325                 NULL
 326         };
 327
 328         switch (id) {
 329                 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
 330                         return mpeg_audio_sampling_freq;
 331                 case V4L2_CID_MPEG_AUDIO_ENCODING:
 332                         return mpeg_audio_encoding;
 333                 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
 334                         return mpeg_audio_l1_bitrate;
 335                 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
 336                         return mpeg_audio_l2_bitrate;
 337                 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
 338                         return mpeg_audio_l3_bitrate;
 339                 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
 340                         return mpeg_audio_ac3_bitrate;
 341                 case V4L2_CID_MPEG_AUDIO_MODE:
 342                         return mpeg_audio_mode;
 343                 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
 344                         return mpeg_audio_mode_extension;
 345                 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
 346                         return mpeg_audio_emphasis;
 347                 case V4L2_CID_MPEG_AUDIO_CRC:
 348                         return mpeg_audio_crc;
 349                 case V4L2_CID_MPEG_VIDEO_ENCODING:
 350                         return mpeg_video_encoding;
 351                 case V4L2_CID_MPEG_VIDEO_ASPECT:
 352                         return mpeg_video_aspect;
 353                 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
 354                         return mpeg_video_bitrate_mode;
 355                 case V4L2_CID_MPEG_STREAM_TYPE:
 356                         return mpeg_stream_type;
 357                 case V4L2_CID_MPEG_STREAM_VBI_FMT:
 358                         return mpeg_stream_vbi_fmt;
 359                 default:
 360                         return NULL;
 361         }
 362 }
 363 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
 364
 365 /* Return the control name. */
 366 const char *v4l2_ctrl_get_name(u32 id)
 367 {
 368         switch (id) {
 369         /* USER controls */
 370         case V4L2_CID_USER_CLASS:       return "User Controls";
 371         case V4L2_CID_AUDIO_VOLUME:     return "Volume";
 372         case V4L2_CID_AUDIO_MUTE:       return "Mute";
 373         case V4L2_CID_AUDIO_BALANCE:    return "Balance";
 374         case V4L2_CID_AUDIO_BASS:       return "Bass";
 375         case V4L2_CID_AUDIO_TREBLE:     return "Treble";
 376         case V4L2_CID_AUDIO_LOUDNESS:   return "Loudness";
 377         case V4L2_CID_BRIGHTNESS:       return "Brightness";
 378         case V4L2_CID_CONTRAST:         return "Contrast";
 379         case V4L2_CID_SATURATION:       return "Saturation";
 380         case V4L2_CID_HUE:              return "Hue";
 381
 382         /* MPEG controls */
 383         case V4L2_CID_MPEG_CLASS:               return "MPEG Encoder Controls";
 384         case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
 385         case V4L2_CID_MPEG_AUDIO_ENCODING:      return "Audio Encoding";
 386         case V4L2_CID_MPEG_AUDIO_L1_BITRATE:    return "Audio Layer I Bitrate";
 387         case V4L2_CID_MPEG_AUDIO_L2_BITRATE:    return "Audio Layer II Bitrate";
 388         case V4L2_CID_MPEG_AUDIO_L3_BITRATE:    return "Audio Layer III Bitrate";
 389         case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:   return "Audio AC-3 Bitrate";
 390         case V4L2_CID_MPEG_AUDIO_MODE:          return "Audio Stereo Mode";
 391         case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
 392         case V4L2_CID_MPEG_AUDIO_EMPHASIS:      return "Audio Emphasis";
 393         case V4L2_CID_MPEG_AUDIO_CRC:           return "Audio CRC";
 394         case V4L2_CID_MPEG_AUDIO_MUTE:          return "Audio Mute";
 395         case V4L2_CID_MPEG_VIDEO_ENCODING:      return "Video Encoding";
 396         case V4L2_CID_MPEG_VIDEO_ASPECT:        return "Video Aspect";
 397         case V4L2_CID_MPEG_VIDEO_B_FRAMES:      return "Video B Frames";
 398         case V4L2_CID_MPEG_VIDEO_GOP_SIZE:      return "Video GOP Size";
 399         case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:   return "Video GOP Closure";
 400         case V4L2_CID_MPEG_VIDEO_PULLDOWN:      return "Video Pulldown";
 401         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:  return "Video Bitrate Mode";
 402         case V4L2_CID_MPEG_VIDEO_BITRATE:       return "Video Bitrate";
 403         case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK:  return "Video Peak Bitrate";
 404         case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
 405         case V4L2_CID_MPEG_VIDEO_MUTE:          return "Video Mute";
 406         case V4L2_CID_MPEG_VIDEO_MUTE_YUV:      return "Video Mute YUV";
 407         case V4L2_CID_MPEG_STREAM_TYPE:         return "Stream Type";
 408         case V4L2_CID_MPEG_STREAM_PID_PMT:      return "Stream PMT Program ID";
 409         case V4L2_CID_MPEG_STREAM_PID_AUDIO:    return "Stream Audio Program ID";
 410         case V4L2_CID_MPEG_STREAM_PID_VIDEO:    return "Stream Video Program ID";
 411         case V4L2_CID_MPEG_STREAM_PID_PCR:      return "Stream PCR Program ID";
 412         case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
 413         case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
 414         case V4L2_CID_MPEG_STREAM_VBI_FMT:      return "Stream VBI Format";
 415
 416         default:
 417                 return NULL;
 418         }
 419 }
 420 EXPORT_SYMBOL(v4l2_ctrl_get_name);
 421
 422 /* Fill in a struct v4l2_queryctrl */
 423 int v4l2_ctrl_query_fill(struct v4l2_queryctrl *qctrl, s32 min, s32 max, s32 step, s32 def)
 424 {
 425         const char *name = v4l2_ctrl_get_name(qctrl->id);
 426
 427         qctrl->flags = 0;
 428         if (name == NULL)
 429                 return -EINVAL;
 430
 431         switch (qctrl->id) {
 432         case V4L2_CID_AUDIO_MUTE:
 433         case V4L2_CID_AUDIO_LOUDNESS:
 434         case V4L2_CID_MPEG_AUDIO_MUTE:
 435         case V4L2_CID_MPEG_VIDEO_MUTE:
 436         case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
 437         case V4L2_CID_MPEG_VIDEO_PULLDOWN:
 438                 qctrl->type = V4L2_CTRL_TYPE_BOOLEAN;
 439                 min = 0;
 440                 max = step = 1;
 441                 break;
 442         case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
 443         case V4L2_CID_MPEG_AUDIO_ENCODING:
 444         case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
 445         case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
 446         case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
 447         case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
 448         case V4L2_CID_MPEG_AUDIO_MODE:
 449         case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
 450         case V4L2_CID_MPEG_AUDIO_EMPHASIS:
 451         case V4L2_CID_MPEG_AUDIO_CRC:
 452         case V4L2_CID_MPEG_VIDEO_ENCODING:
 453         case V4L2_CID_MPEG_VIDEO_ASPECT:
 454         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
 455         case V4L2_CID_MPEG_STREAM_TYPE:
 456         case V4L2_CID_MPEG_STREAM_VBI_FMT:
 457                 qctrl->type = V4L2_CTRL_TYPE_MENU;
 458                 step = 1;
 459                 break;
 460         case V4L2_CID_USER_CLASS:
 461         case V4L2_CID_MPEG_CLASS:
 462                 qctrl->type = V4L2_CTRL_TYPE_CTRL_CLASS;
 463                 qctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
 464                 min = max = step = def = 0;
 465                 break;
 466         default:
 467                 qctrl->type = V4L2_CTRL_TYPE_INTEGER;
 468                 break;
 469         }
 470         switch (qctrl->id) {
 471         case V4L2_CID_MPEG_AUDIO_ENCODING:
 472         case V4L2_CID_MPEG_AUDIO_MODE:
 473         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
 474         case V4L2_CID_MPEG_VIDEO_B_FRAMES:
 475         case V4L2_CID_MPEG_STREAM_TYPE:
 476                 qctrl->flags |= V4L2_CTRL_FLAG_UPDATE;
 477                 break;
 478         case V4L2_CID_AUDIO_VOLUME:
 479         case V4L2_CID_AUDIO_BALANCE:
 480         case V4L2_CID_AUDIO_BASS:
 481         case V4L2_CID_AUDIO_TREBLE:
 482         case V4L2_CID_BRIGHTNESS:
 483         case V4L2_CID_CONTRAST:
 484         case V4L2_CID_SATURATION:
 485         case V4L2_CID_HUE:
 486                 qctrl->flags |= V4L2_CTRL_FLAG_SLIDER;
 487                 break;
 488         }
 489         qctrl->minimum = min;
 490         qctrl->maximum = max;
 491         qctrl->step = step;
 492         qctrl->default_value = def;
 493         qctrl->reserved[0] = qctrl->reserved[1] = 0;
 494         snprintf(qctrl->name, sizeof(qctrl->name), name);
 495         return 0;
 496 }
 497 EXPORT_SYMBOL(v4l2_ctrl_query_fill);
 498
 499 /* Fill in a struct v4l2_queryctrl with standard values based on
 500    the control ID. */
 501 int v4l2_ctrl_query_fill_std(struct v4l2_queryctrl *qctrl)
 502 {
 503         switch (qctrl->id) {
 504         /* USER controls */
 505         case V4L2_CID_USER_CLASS:
 506         case V4L2_CID_MPEG_CLASS:
 507                 return v4l2_ctrl_query_fill(qctrl, 0, 0, 0, 0);
 508         case V4L2_CID_AUDIO_VOLUME:
 509                 return v4l2_ctrl_query_fill(qctrl, 0, 65535, 65535 / 100, 58880);
 510         case V4L2_CID_AUDIO_MUTE:
 511         case V4L2_CID_AUDIO_LOUDNESS:
 512                 return v4l2_ctrl_query_fill(qctrl, 0, 1, 1, 0);
 513         case V4L2_CID_AUDIO_BALANCE:
 514         case V4L2_CID_AUDIO_BASS:
 515         case V4L2_CID_AUDIO_TREBLE:
 516                 return v4l2_ctrl_query_fill(qctrl, 0, 65535, 65535 / 100, 32768);
 517         case V4L2_CID_BRIGHTNESS:
 518                 return v4l2_ctrl_query_fill(qctrl, 0, 255, 1, 128);
 519         case V4L2_CID_CONTRAST:
 520         case V4L2_CID_SATURATION:
 521                 return v4l2_ctrl_query_fill(qctrl, 0, 127, 1, 64);
 522         case V4L2_CID_HUE:
 523                 return v4l2_ctrl_query_fill(qctrl, -128, 127, 1, 0);
 524
 525         /* MPEG controls */
 526         case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
 527                 return v4l2_ctrl_query_fill(qctrl,
 528                                 V4L2_MPEG_AUDIO_SAMPLING_FREQ_44100,
 529                                 V4L2_MPEG_AUDIO_SAMPLING_FREQ_32000, 1,
 530                                 V4L2_MPEG_AUDIO_SAMPLING_FREQ_48000);
 531         case V4L2_CID_MPEG_AUDIO_ENCODING:
 532                 return v4l2_ctrl_query_fill(qctrl,
 533                                 V4L2_MPEG_AUDIO_ENCODING_LAYER_1,
 534                                 V4L2_MPEG_AUDIO_ENCODING_AC3, 1,
 535                                 V4L2_MPEG_AUDIO_ENCODING_LAYER_2);
 536         case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
 537                 return v4l2_ctrl_query_fill(qctrl,
 538                                 V4L2_MPEG_AUDIO_L1_BITRATE_32K,
 539                                 V4L2_MPEG_AUDIO_L1_BITRATE_448K, 1,
 540                                 V4L2_MPEG_AUDIO_L1_BITRATE_256K);
 541         case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
 542                 return v4l2_ctrl_query_fill(qctrl,
 543                                 V4L2_MPEG_AUDIO_L2_BITRATE_32K,
 544                                 V4L2_MPEG_AUDIO_L2_BITRATE_384K, 1,
 545                                 V4L2_MPEG_AUDIO_L2_BITRATE_224K);
 546         case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
 547                 return v4l2_ctrl_query_fill(qctrl,
 548                                 V4L2_MPEG_AUDIO_L3_BITRATE_32K,
 549                                 V4L2_MPEG_AUDIO_L3_BITRATE_320K, 1,
 550                                 V4L2_MPEG_AUDIO_L3_BITRATE_192K);
 551         case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
 552                 return v4l2_ctrl_query_fill(qctrl,
 553                                 V4L2_MPEG_AUDIO_AC3_BITRATE_32K,
 554                                 V4L2_MPEG_AUDIO_AC3_BITRATE_640K, 1,
 555                                 V4L2_MPEG_AUDIO_AC3_BITRATE_384K);
 556         case V4L2_CID_MPEG_AUDIO_MODE:
 557                 return v4l2_ctrl_query_fill(qctrl,
 558                                 V4L2_MPEG_AUDIO_MODE_STEREO,
 559                                 V4L2_MPEG_AUDIO_MODE_MONO, 1,
 560                                 V4L2_MPEG_AUDIO_MODE_STEREO);
 561         case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
 562                 return v4l2_ctrl_query_fill(qctrl,
 563                                 V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_4,
 564                                 V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_16, 1,
 565                                 V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_4);
 566         case V4L2_CID_MPEG_AUDIO_EMPHASIS:
 567                 return v4l2_ctrl_query_fill(qctrl,
 568                                 V4L2_MPEG_AUDIO_EMPHASIS_NONE,
 569                                 V4L2_MPEG_AUDIO_EMPHASIS_CCITT_J17, 1,
 570                                 V4L2_MPEG_AUDIO_EMPHASIS_NONE);
 571         case V4L2_CID_MPEG_AUDIO_CRC:
 572                 return v4l2_ctrl_query_fill(qctrl,
 573                                 V4L2_MPEG_AUDIO_CRC_NONE,
 574                                 V4L2_MPEG_AUDIO_CRC_CRC16, 1,
 575                                 V4L2_MPEG_AUDIO_CRC_NONE);
 576         case V4L2_CID_MPEG_AUDIO_MUTE:
 577                 return v4l2_ctrl_query_fill(qctrl, 0, 1, 1, 0);
 578         case V4L2_CID_MPEG_VIDEO_ENCODING:
 579                 return v4l2_ctrl_query_fill(qctrl,
 580                                 V4L2_MPEG_VIDEO_ENCODING_MPEG_1,
 581                                 V4L2_MPEG_VIDEO_ENCODING_MPEG_4_AVC, 1,
 582                                 V4L2_MPEG_VIDEO_ENCODING_MPEG_2);
 583         case V4L2_CID_MPEG_VIDEO_ASPECT:
 584                 return v4l2_ctrl_query_fill(qctrl,
 585                                 V4L2_MPEG_VIDEO_ASPECT_1x1,
 586                                 V4L2_MPEG_VIDEO_ASPECT_221x100, 1,
 587                                 V4L2_MPEG_VIDEO_ASPECT_4x3);
 588         case V4L2_CID_MPEG_VIDEO_B_FRAMES:
 589                 return v4l2_ctrl_query_fill(qctrl, 0, 33, 1, 2);
 590         case V4L2_CID_MPEG_VIDEO_GOP_SIZE:
 591                 return v4l2_ctrl_query_fill(qctrl, 1, 34, 1, 12);
 592         case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
 593                 return v4l2_ctrl_query_fill(qctrl, 0, 1, 1, 1);
 594         case V4L2_CID_MPEG_VIDEO_PULLDOWN:
 595                 return v4l2_ctrl_query_fill(qctrl, 0, 1, 1, 0);
 596         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
 597                 return v4l2_ctrl_query_fill(qctrl,
 598                                 V4L2_MPEG_VIDEO_BITRATE_MODE_VBR,
 599                                 V4L2_MPEG_VIDEO_BITRATE_MODE_CBR, 1,
 600                                 V4L2_MPEG_VIDEO_BITRATE_MODE_VBR);
 601         case V4L2_CID_MPEG_VIDEO_BITRATE:
 602                 return v4l2_ctrl_query_fill(qctrl, 0, 27000000, 1, 6000000);
 603         case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK:
 604                 return v4l2_ctrl_query_fill(qctrl, 0, 27000000, 1, 8000000);
 605         case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION:
 606                 return v4l2_ctrl_query_fill(qctrl, 0, 255, 1, 0);
 607         case V4L2_CID_MPEG_VIDEO_MUTE:
 608                 return v4l2_ctrl_query_fill(qctrl, 0, 1, 1, 0);
 609         case V4L2_CID_MPEG_VIDEO_MUTE_YUV:  /* Init YUV (really YCbCr) to black */
 610                 return v4l2_ctrl_query_fill(qctrl, 0, 0xffffff, 1, 0x008080);
 611         case V4L2_CID_MPEG_STREAM_TYPE:
 612                 return v4l2_ctrl_query_fill(qctrl,
 613                                 V4L2_MPEG_STREAM_TYPE_MPEG2_PS,
 614                                 V4L2_MPEG_STREAM_TYPE_MPEG2_SVCD, 1,
 615                                 V4L2_MPEG_STREAM_TYPE_MPEG2_PS);
 616         case V4L2_CID_MPEG_STREAM_PID_PMT:
 617                 return v4l2_ctrl_query_fill(qctrl, 0, (1 << 14) - 1, 1, 16);
 618         case V4L2_CID_MPEG_STREAM_PID_AUDIO:
 619                 return v4l2_ctrl_query_fill(qctrl, 0, (1 << 14) - 1, 1, 260);
 620         case V4L2_CID_MPEG_STREAM_PID_VIDEO:
 621                 return v4l2_ctrl_query_fill(qctrl, 0, (1 << 14) - 1, 1, 256);
 622         case V4L2_CID_MPEG_STREAM_PID_PCR:
 623                 return v4l2_ctrl_query_fill(qctrl, 0, (1 << 14) - 1, 1, 259);
 624         case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO:
 625                 return v4l2_ctrl_query_fill(qctrl, 0, 255, 1, 0);
 626         case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO:
 627                 return v4l2_ctrl_query_fill(qctrl, 0, 255, 1, 0);
 628         case V4L2_CID_MPEG_STREAM_VBI_FMT:
 629                 return v4l2_ctrl_query_fill(qctrl,
 630                                 V4L2_MPEG_STREAM_VBI_FMT_NONE,
 631                                 V4L2_MPEG_STREAM_VBI_FMT_IVTV, 1,
 632                                 V4L2_MPEG_STREAM_VBI_FMT_NONE);
 633         default:
 634                 return -EINVAL;
 635         }
 636 }
 637 EXPORT_SYMBOL(v4l2_ctrl_query_fill_std);
 638
 639 /* Fill in a struct v4l2_querymenu based on the struct v4l2_queryctrl and
 640    the menu. The qctrl pointer may be NULL, in which case it is ignored. */
 641 int v4l2_ctrl_query_menu(struct v4l2_querymenu *qmenu, struct v4l2_queryctrl *qctrl,
 642                const char **menu_items)
 643 {
 644         int i;
 645
 646         if (menu_items == NULL ||
 647             (qctrl && (qmenu->index < qctrl->minimum || qmenu->index > qctrl->maximum)))
 648                 return -EINVAL;
 649         for (i = 0; i < qmenu->index && menu_items[i]; i++) ;
 650         if (menu_items[i] == NULL || menu_items[i][0] == '\0')
 651                 return -EINVAL;
 652         snprintf(qmenu->name, sizeof(qmenu->name), menu_items[qmenu->index]);
 653         qmenu->reserved = 0;
 654         return 0;
 655 }
 656 EXPORT_SYMBOL(v4l2_ctrl_query_menu);
 657
 658 /* ctrl_classes points to an array of u32 pointers, the last element is
 659    a NULL pointer. Each u32 array is a 0-terminated array of control IDs.
 660    Each array must be sorted low to high and belong to the same control
 661    class. The array of u32 pointer must also be sorted, from low class IDs
 662    to high class IDs.
 663
 664    This function returns the first ID that follows after the given ID.
 665    When no more controls are available 0 is returned. */
 666 u32 v4l2_ctrl_next(const u32 * const * ctrl_classes, u32 id)
 667 {
 668         u32 ctrl_class = V4L2_CTRL_ID2CLASS(id);
 669         const u32 *pctrl;
 670
 671         if (ctrl_classes == NULL)
 672                 return 0;
 673
 674         /* if no query is desired, then check if the ID is part of ctrl_classes */
 675         if ((id & V4L2_CTRL_FLAG_NEXT_CTRL) == 0) {
 676                 /* find class */
 677                 while (*ctrl_classes && V4L2_CTRL_ID2CLASS(**ctrl_classes) != ctrl_class)
 678                         ctrl_classes++;
 679                 if (*ctrl_classes == NULL)
 680                         return 0;
 681                 pctrl = *ctrl_classes;
 682                 /* find control ID */
 683                 while (*pctrl && *pctrl != id) pctrl++;
 684                 return *pctrl ? id : 0;
 685         }
 686         id &= V4L2_CTRL_ID_MASK;
 687         id++;   /* select next control */
 688         /* find first class that matches (or is greater than) the class of
 689            the ID */
 690         while (*ctrl_classes && V4L2_CTRL_ID2CLASS(**ctrl_classes) < ctrl_class)
 691                 ctrl_classes++;
 692         /* no more classes */
 693         if (*ctrl_classes == NULL)
 694                 return 0;
 695         pctrl = *ctrl_classes;
 696         /* find first ctrl within the class that is >= ID */
 697         while (*pctrl && *pctrl < id) pctrl++;
 698         if (*pctrl)
 699                 return *pctrl;
 700         /* we are at the end of the controls of the current class. */
 701         /* continue with next class if available */
 702         ctrl_classes++;
 703         if (*ctrl_classes == NULL)
 704                 return 0;
 705         return **ctrl_classes;
 706 }
 707 EXPORT_SYMBOL(v4l2_ctrl_next);
 708
 709 int v4l2_chip_match_host(u32 match_type, u32 match_chip)
 710 {
 711         switch (match_type) {
 712         case V4L2_CHIP_MATCH_HOST:
 713                 return match_chip == 0;
 714         default:
 715                 return 0;
 716         }
 717 }
 718 EXPORT_SYMBOL(v4l2_chip_match_host);
 719
 720 #if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE))
 721 int v4l2_chip_match_i2c_client(struct i2c_client *c, u32 match_type, u32 match_chip)
 722 {
 723         switch (match_type) {
 724         case V4L2_CHIP_MATCH_I2C_DRIVER:
 725                 return (c != NULL && c->driver != NULL && c->driver->id == match_chip);
 726         case V4L2_CHIP_MATCH_I2C_ADDR:
 727                 return (c != NULL && c->addr == match_chip);
 728         default:
 729                 return 0;
 730         }
 731 }
 732 EXPORT_SYMBOL(v4l2_chip_match_i2c_client);
 733
 734 int v4l2_chip_ident_i2c_client(struct i2c_client *c, struct v4l2_chip_ident *chip,
 735                 u32 ident, u32 revision)
 736 {
 737         if (!v4l2_chip_match_i2c_client(c, chip->match_type, chip->match_chip))
 738                 return 0;
 739         if (chip->ident == V4L2_IDENT_NONE) {
 740                 chip->ident = ident;
 741                 chip->revision = revision;
 742         }
 743         else {
 744                 chip->ident = V4L2_IDENT_AMBIGUOUS;
 745                 chip->revision = 0;
 746         }
 747         return 0;
 748 }
 749 EXPORT_SYMBOL(v4l2_chip_ident_i2c_client);
 750
 751 /* ----------------------------------------------------------------- */
 752
 753 /* Helper function for I2C legacy drivers */
 754
 755 int v4l2_i2c_attach(struct i2c_adapter *adapter, int address, struct i2c_driver *driver,
 756                 const char *name,
 757                 int (*probe)(struct i2c_client *, const struct i2c_device_id *))
 758 {
 759         struct i2c_client *client;
 760         int err;
 761
 762         client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
 763         if (!client)
 764                 return -ENOMEM;
 765
 766         client->addr = address;
 767         client->adapter = adapter;
 768         client->driver = driver;
 769         strlcpy(client->name, name, sizeof(client->name));
 770
 771         err = probe(client, NULL);
 772         if (err == 0) {
 773                 i2c_attach_client(client);
 774         } else {
 775                 kfree(client);
 776         }
 777         return err != -ENOMEM ? 0 : err;
 778 }
 779 EXPORT_SYMBOL(v4l2_i2c_attach);
 780 #endif