drivers/media/video/v4l2-ctrls.c

   1 /*
   2     V4L2 controls framework implementation.
   3
   4     Copyright (C) 2010  Hans Verkuil <hverkuil@xs4all.nl>
   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 as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <linux/ctype.h>
  22 #include <linux/slab.h>
  23 #include <linux/export.h>
  24 #include <media/v4l2-ioctl.h>
  25 #include <media/v4l2-device.h>
  26 #include <media/v4l2-ctrls.h>
  27 #include <media/v4l2-event.h>
  28 #include <media/v4l2-dev.h>
  29
  30 #define has_op(master, op) \
  31         (master->ops && master->ops->op)
  32 #define call_op(master, op) \
  33         (has_op(master, op) ? master->ops->op(master) : 0)
  34
  35 /* Internal temporary helper struct, one for each v4l2_ext_control */
  36 struct v4l2_ctrl_helper {
  37         /* Pointer to the control reference of the master control */
  38         struct v4l2_ctrl_ref *mref;
  39         /* The control corresponding to the v4l2_ext_control ID field. */
  40         struct v4l2_ctrl *ctrl;
  41         /* v4l2_ext_control index of the next control belonging to the
  42            same cluster, or 0 if there isn't any. */
  43         u32 next;
  44 };
  45
  46 /* Small helper function to determine if the autocluster is set to manual
  47    mode. */
  48 static bool is_cur_manual(const struct v4l2_ctrl *master)
  49 {
  50         return master->is_auto && master->cur.val == master->manual_mode_value;
  51 }
  52
  53 /* Same as above, but this checks the against the new value instead of the
  54    current value. */
  55 static bool is_new_manual(const struct v4l2_ctrl *master)
  56 {
  57         return master->is_auto && master->val == master->manual_mode_value;
  58 }
  59
  60 /* Returns NULL or a character pointer array containing the menu for
  61    the given control ID. The pointer array ends with a NULL pointer.
  62    An empty string signifies a menu entry that is invalid. This allows
  63    drivers to disable certain options if it is not supported. */
  64 const char * const *v4l2_ctrl_get_menu(u32 id)
  65 {
  66         static const char * const mpeg_audio_sampling_freq[] = {
  67                 "44.1 kHz",
  68                 "48 kHz",
  69                 "32 kHz",
  70                 NULL
  71         };
  72         static const char * const mpeg_audio_encoding[] = {
  73                 "MPEG-1/2 Layer I",
  74                 "MPEG-1/2 Layer II",
  75                 "MPEG-1/2 Layer III",
  76                 "MPEG-2/4 AAC",
  77                 "AC-3",
  78                 NULL
  79         };
  80         static const char * const mpeg_audio_l1_bitrate[] = {
  81                 "32 kbps",
  82                 "64 kbps",
  83                 "96 kbps",
  84                 "128 kbps",
  85                 "160 kbps",
  86                 "192 kbps",
  87                 "224 kbps",
  88                 "256 kbps",
  89                 "288 kbps",
  90                 "320 kbps",
  91                 "352 kbps",
  92                 "384 kbps",
  93                 "416 kbps",
  94                 "448 kbps",
  95                 NULL
  96         };
  97         static const char * const mpeg_audio_l2_bitrate[] = {
  98                 "32 kbps",
  99                 "48 kbps",
 100                 "56 kbps",
 101                 "64 kbps",
 102                 "80 kbps",
 103                 "96 kbps",
 104                 "112 kbps",
 105                 "128 kbps",
 106                 "160 kbps",
 107                 "192 kbps",
 108                 "224 kbps",
 109                 "256 kbps",
 110                 "320 kbps",
 111                 "384 kbps",
 112                 NULL
 113         };
 114         static const char * const mpeg_audio_l3_bitrate[] = {
 115                 "32 kbps",
 116                 "40 kbps",
 117                 "48 kbps",
 118                 "56 kbps",
 119                 "64 kbps",
 120                 "80 kbps",
 121                 "96 kbps",
 122                 "112 kbps",
 123                 "128 kbps",
 124                 "160 kbps",
 125                 "192 kbps",
 126                 "224 kbps",
 127                 "256 kbps",
 128                 "320 kbps",
 129                 NULL
 130         };
 131         static const char * const mpeg_audio_ac3_bitrate[] = {
 132                 "32 kbps",
 133                 "40 kbps",
 134                 "48 kbps",
 135                 "56 kbps",
 136                 "64 kbps",
 137                 "80 kbps",
 138                 "96 kbps",
 139                 "112 kbps",
 140                 "128 kbps",
 141                 "160 kbps",
 142                 "192 kbps",
 143                 "224 kbps",
 144                 "256 kbps",
 145                 "320 kbps",
 146                 "384 kbps",
 147                 "448 kbps",
 148                 "512 kbps",
 149                 "576 kbps",
 150                 "640 kbps",
 151                 NULL
 152         };
 153         static const char * const mpeg_audio_mode[] = {
 154                 "Stereo",
 155                 "Joint Stereo",
 156                 "Dual",
 157                 "Mono",
 158                 NULL
 159         };
 160         static const char * const mpeg_audio_mode_extension[] = {
 161                 "Bound 4",
 162                 "Bound 8",
 163                 "Bound 12",
 164                 "Bound 16",
 165                 NULL
 166         };
 167         static const char * const mpeg_audio_emphasis[] = {
 168                 "No Emphasis",
 169                 "50/15 us",
 170                 "CCITT J17",
 171                 NULL
 172         };
 173         static const char * const mpeg_audio_crc[] = {
 174                 "No CRC",
 175                 "16-bit CRC",
 176                 NULL
 177         };
 178         static const char * const mpeg_audio_dec_playback[] = {
 179                 "Auto",
 180                 "Stereo",
 181                 "Left",
 182                 "Right",
 183                 "Mono",
 184                 "Swapped Stereo",
 185                 NULL
 186         };
 187         static const char * const mpeg_video_encoding[] = {
 188                 "MPEG-1",
 189                 "MPEG-2",
 190                 "MPEG-4 AVC",
 191                 NULL
 192         };
 193         static const char * const mpeg_video_aspect[] = {
 194                 "1x1",
 195                 "4x3",
 196                 "16x9",
 197                 "2.21x1",
 198                 NULL
 199         };
 200         static const char * const mpeg_video_bitrate_mode[] = {
 201                 "Variable Bitrate",
 202                 "Constant Bitrate",
 203                 NULL
 204         };
 205         static const char * const mpeg_stream_type[] = {
 206                 "MPEG-2 Program Stream",
 207                 "MPEG-2 Transport Stream",
 208                 "MPEG-1 System Stream",
 209                 "MPEG-2 DVD-compatible Stream",
 210                 "MPEG-1 VCD-compatible Stream",
 211                 "MPEG-2 SVCD-compatible Stream",
 212                 NULL
 213         };
 214         static const char * const mpeg_stream_vbi_fmt[] = {
 215                 "No VBI",
 216                 "Private Packet, IVTV Format",
 217                 NULL
 218         };
 219         static const char * const camera_power_line_frequency[] = {
 220                 "Disabled",
 221                 "50 Hz",
 222                 "60 Hz",
 223                 "Auto",
 224                 NULL
 225         };
 226         static const char * const camera_exposure_auto[] = {
 227                 "Auto Mode",
 228                 "Manual Mode",
 229                 "Shutter Priority Mode",
 230                 "Aperture Priority Mode",
 231                 NULL
 232         };
 233         static const char * const colorfx[] = {
 234                 "None",
 235                 "Black & White",
 236                 "Sepia",
 237                 "Negative",
 238                 "Emboss",
 239                 "Sketch",
 240                 "Sky Blue",
 241                 "Grass Green",
 242                 "Skin Whiten",
 243                 "Vivid",
 244                 "Aqua",
 245                 "Art Freeze",
 246                 "Silhouette",
 247                 "Solarization",
 248                 "Antique",
 249                 "Set Cb/Cr",
 250                 NULL
 251         };
 252         static const char * const auto_n_preset_white_balance[] = {
 253                 "Manual",
 254                 "Auto",
 255                 "Incandescent",
 256                 "Fluorescent",
 257                 "Fluorescent H",
 258                 "Horizon",
 259                 "Daylight",
 260                 "Flash",
 261                 "Cloudy",
 262                 "Shade",
 263                 NULL,
 264         };
 265         static const char * const tune_preemphasis[] = {
 266                 "No Preemphasis",
 267                 "50 Microseconds",
 268                 "75 Microseconds",
 269                 NULL,
 270         };
 271         static const char * const header_mode[] = {
 272                 "Separate Buffer",
 273                 "Joined With 1st Frame",
 274                 NULL,
 275         };
 276         static const char * const multi_slice[] = {
 277                 "Single",
 278                 "Max Macroblocks",
 279                 "Max Bytes",
 280                 NULL,
 281         };
 282         static const char * const entropy_mode[] = {
 283                 "CAVLC",
 284                 "CABAC",
 285                 NULL,
 286         };
 287         static const char * const mpeg_h264_level[] = {
 288                 "1",
 289                 "1b",
 290                 "1.1",
 291                 "1.2",
 292                 "1.3",
 293                 "2",
 294                 "2.1",
 295                 "2.2",
 296                 "3",
 297                 "3.1",
 298                 "3.2",
 299                 "4",
 300                 "4.1",
 301                 "4.2",
 302                 "5",
 303                 "5.1",
 304                 NULL,
 305         };
 306         static const char * const h264_loop_filter[] = {
 307                 "Enabled",
 308                 "Disabled",
 309                 "Disabled at Slice Boundary",
 310                 NULL,
 311         };
 312         static const char * const h264_profile[] = {
 313                 "Baseline",
 314                 "Constrained Baseline",
 315                 "Main",
 316                 "Extended",
 317                 "High",
 318                 "High 10",
 319                 "High 422",
 320                 "High 444 Predictive",
 321                 "High 10 Intra",
 322                 "High 422 Intra",
 323                 "High 444 Intra",
 324                 "CAVLC 444 Intra",
 325                 "Scalable Baseline",
 326                 "Scalable High",
 327                 "Scalable High Intra",
 328                 "Multiview High",
 329                 NULL,
 330         };
 331         static const char * const vui_sar_idc[] = {
 332                 "Unspecified",
 333                 "1:1",
 334                 "12:11",
 335                 "10:11",
 336                 "16:11",
 337                 "40:33",
 338                 "24:11",
 339                 "20:11",
 340                 "32:11",
 341                 "80:33",
 342                 "18:11",
 343                 "15:11",
 344                 "64:33",
 345                 "160:99",
 346                 "4:3",
 347                 "3:2",
 348                 "2:1",
 349                 "Extended SAR",
 350                 NULL,
 351         };
 352         static const char * const mpeg_mpeg4_level[] = {
 353                 "0",
 354                 "0b",
 355                 "1",
 356                 "2",
 357                 "3",
 358                 "3b",
 359                 "4",
 360                 "5",
 361                 NULL,
 362         };
 363         static const char * const mpeg4_profile[] = {
 364                 "Simple",
 365                 "Advanced Simple",
 366                 "Core",
 367                 "Simple Scalable",
 368                 "Advanced Coding Efficency",
 369                 NULL,
 370         };
 371
 372         static const char * const flash_led_mode[] = {
 373                 "Off",
 374                 "Flash",
 375                 "Torch",
 376                 NULL,
 377         };
 378         static const char * const flash_strobe_source[] = {
 379                 "Software",
 380                 "External",
 381                 NULL,
 382         };
 383
 384         static const char * const jpeg_chroma_subsampling[] = {
 385                 "4:4:4",
 386                 "4:2:2",
 387                 "4:2:0",
 388                 "4:1:1",
 389                 "4:1:0",
 390                 "Gray",
 391                 NULL,
 392         };
 393
 394         switch (id) {
 395         case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
 396                 return mpeg_audio_sampling_freq;
 397         case V4L2_CID_MPEG_AUDIO_ENCODING:
 398                 return mpeg_audio_encoding;
 399         case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
 400                 return mpeg_audio_l1_bitrate;
 401         case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
 402                 return mpeg_audio_l2_bitrate;
 403         case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
 404                 return mpeg_audio_l3_bitrate;
 405         case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
 406                 return mpeg_audio_ac3_bitrate;
 407         case V4L2_CID_MPEG_AUDIO_MODE:
 408                 return mpeg_audio_mode;
 409         case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
 410                 return mpeg_audio_mode_extension;
 411         case V4L2_CID_MPEG_AUDIO_EMPHASIS:
 412                 return mpeg_audio_emphasis;
 413         case V4L2_CID_MPEG_AUDIO_CRC:
 414                 return mpeg_audio_crc;
 415         case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
 416         case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
 417                 return mpeg_audio_dec_playback;
 418         case V4L2_CID_MPEG_VIDEO_ENCODING:
 419                 return mpeg_video_encoding;
 420         case V4L2_CID_MPEG_VIDEO_ASPECT:
 421                 return mpeg_video_aspect;
 422         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
 423                 return mpeg_video_bitrate_mode;
 424         case V4L2_CID_MPEG_STREAM_TYPE:
 425                 return mpeg_stream_type;
 426         case V4L2_CID_MPEG_STREAM_VBI_FMT:
 427                 return mpeg_stream_vbi_fmt;
 428         case V4L2_CID_POWER_LINE_FREQUENCY:
 429                 return camera_power_line_frequency;
 430         case V4L2_CID_EXPOSURE_AUTO:
 431                 return camera_exposure_auto;
 432         case V4L2_CID_COLORFX:
 433                 return colorfx;
 434         case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
 435                 return auto_n_preset_white_balance;
 436         case V4L2_CID_TUNE_PREEMPHASIS:
 437                 return tune_preemphasis;
 438         case V4L2_CID_FLASH_LED_MODE:
 439                 return flash_led_mode;
 440         case V4L2_CID_FLASH_STROBE_SOURCE:
 441                 return flash_strobe_source;
 442         case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
 443                 return header_mode;
 444         case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
 445                 return multi_slice;
 446         case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
 447                 return entropy_mode;
 448         case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
 449                 return mpeg_h264_level;
 450         case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
 451                 return h264_loop_filter;
 452         case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
 453                 return h264_profile;
 454         case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
 455                 return vui_sar_idc;
 456         case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
 457                 return mpeg_mpeg4_level;
 458         case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
 459                 return mpeg4_profile;
 460         case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
 461                 return jpeg_chroma_subsampling;
 462
 463         default:
 464                 return NULL;
 465         }
 466 }
 467 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
 468
 469 /* Return the control name. */
 470 const char *v4l2_ctrl_get_name(u32 id)
 471 {
 472         switch (id) {
 473         /* USER controls */
 474         /* Keep the order of the 'case's the same as in videodev2.h! */
 475         case V4L2_CID_USER_CLASS:               return "User Controls";
 476         case V4L2_CID_BRIGHTNESS:               return "Brightness";
 477         case V4L2_CID_CONTRAST:                 return "Contrast";
 478         case V4L2_CID_SATURATION:               return "Saturation";
 479         case V4L2_CID_HUE:                      return "Hue";
 480         case V4L2_CID_AUDIO_VOLUME:             return "Volume";
 481         case V4L2_CID_AUDIO_BALANCE:            return "Balance";
 482         case V4L2_CID_AUDIO_BASS:               return "Bass";
 483         case V4L2_CID_AUDIO_TREBLE:             return "Treble";
 484         case V4L2_CID_AUDIO_MUTE:               return "Mute";
 485         case V4L2_CID_AUDIO_LOUDNESS:           return "Loudness";
 486         case V4L2_CID_BLACK_LEVEL:              return "Black Level";
 487         case V4L2_CID_AUTO_WHITE_BALANCE:       return "White Balance, Automatic";
 488         case V4L2_CID_DO_WHITE_BALANCE:         return "Do White Balance";
 489         case V4L2_CID_RED_BALANCE:              return "Red Balance";
 490         case V4L2_CID_BLUE_BALANCE:             return "Blue Balance";
 491         case V4L2_CID_GAMMA:                    return "Gamma";
 492         case V4L2_CID_EXPOSURE:                 return "Exposure";
 493         case V4L2_CID_AUTOGAIN:                 return "Gain, Automatic";
 494         case V4L2_CID_GAIN:                     return "Gain";
 495         case V4L2_CID_HFLIP:                    return "Horizontal Flip";
 496         case V4L2_CID_VFLIP:                    return "Vertical Flip";
 497         case V4L2_CID_HCENTER:                  return "Horizontal Center";
 498         case V4L2_CID_VCENTER:                  return "Vertical Center";
 499         case V4L2_CID_POWER_LINE_FREQUENCY:     return "Power Line Frequency";
 500         case V4L2_CID_HUE_AUTO:                 return "Hue, Automatic";
 501         case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
 502         case V4L2_CID_SHARPNESS:                return "Sharpness";
 503         case V4L2_CID_BACKLIGHT_COMPENSATION:   return "Backlight Compensation";
 504         case V4L2_CID_CHROMA_AGC:               return "Chroma AGC";
 505         case V4L2_CID_COLOR_KILLER:             return "Color Killer";
 506         case V4L2_CID_COLORFX:                  return "Color Effects";
 507         case V4L2_CID_AUTOBRIGHTNESS:           return "Brightness, Automatic";
 508         case V4L2_CID_BAND_STOP_FILTER:         return "Band-Stop Filter";
 509         case V4L2_CID_ROTATE:                   return "Rotate";
 510         case V4L2_CID_BG_COLOR:                 return "Background Color";
 511         case V4L2_CID_CHROMA_GAIN:              return "Chroma Gain";
 512         case V4L2_CID_ILLUMINATORS_1:           return "Illuminator 1";
 513         case V4L2_CID_ILLUMINATORS_2:           return "Illuminator 2";
 514         case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:  return "Min Number of Capture Buffers";
 515         case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:   return "Min Number of Output Buffers";
 516         case V4L2_CID_ALPHA_COMPONENT:          return "Alpha Component";
 517         case V4L2_CID_COLORFX_CBCR:             return "Color Effects, CbCr";
 518
 519         /* MPEG controls */
 520         /* Keep the order of the 'case's the same as in videodev2.h! */
 521         case V4L2_CID_MPEG_CLASS:               return "MPEG Encoder Controls";
 522         case V4L2_CID_MPEG_STREAM_TYPE:         return "Stream Type";
 523         case V4L2_CID_MPEG_STREAM_PID_PMT:      return "Stream PMT Program ID";
 524         case V4L2_CID_MPEG_STREAM_PID_AUDIO:    return "Stream Audio Program ID";
 525         case V4L2_CID_MPEG_STREAM_PID_VIDEO:    return "Stream Video Program ID";
 526         case V4L2_CID_MPEG_STREAM_PID_PCR:      return "Stream PCR Program ID";
 527         case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
 528         case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
 529         case V4L2_CID_MPEG_STREAM_VBI_FMT:      return "Stream VBI Format";
 530         case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
 531         case V4L2_CID_MPEG_AUDIO_ENCODING:      return "Audio Encoding";
 532         case V4L2_CID_MPEG_AUDIO_L1_BITRATE:    return "Audio Layer I Bitrate";
 533         case V4L2_CID_MPEG_AUDIO_L2_BITRATE:    return "Audio Layer II Bitrate";
 534         case V4L2_CID_MPEG_AUDIO_L3_BITRATE:    return "Audio Layer III Bitrate";
 535         case V4L2_CID_MPEG_AUDIO_MODE:          return "Audio Stereo Mode";
 536         case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
 537         case V4L2_CID_MPEG_AUDIO_EMPHASIS:      return "Audio Emphasis";
 538         case V4L2_CID_MPEG_AUDIO_CRC:           return "Audio CRC";
 539         case V4L2_CID_MPEG_AUDIO_MUTE:          return "Audio Mute";
 540         case V4L2_CID_MPEG_AUDIO_AAC_BITRATE:   return "Audio AAC Bitrate";
 541         case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:   return "Audio AC-3 Bitrate";
 542         case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:  return "Audio Playback";
 543         case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK: return "Audio Multilingual Playback";
 544         case V4L2_CID_MPEG_VIDEO_ENCODING:      return "Video Encoding";
 545         case V4L2_CID_MPEG_VIDEO_ASPECT:        return "Video Aspect";
 546         case V4L2_CID_MPEG_VIDEO_B_FRAMES:      return "Video B Frames";
 547         case V4L2_CID_MPEG_VIDEO_GOP_SIZE:      return "Video GOP Size";
 548         case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:   return "Video GOP Closure";
 549         case V4L2_CID_MPEG_VIDEO_PULLDOWN:      return "Video Pulldown";
 550         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:  return "Video Bitrate Mode";
 551         case V4L2_CID_MPEG_VIDEO_BITRATE:       return "Video Bitrate";
 552         case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK:  return "Video Peak Bitrate";
 553         case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
 554         case V4L2_CID_MPEG_VIDEO_MUTE:          return "Video Mute";
 555         case V4L2_CID_MPEG_VIDEO_MUTE_YUV:      return "Video Mute YUV";
 556         case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:       return "Decoder Slice Interface";
 557         case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:  return "MPEG4 Loop Filter Enable";
 558         case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB:       return "Number of Intra Refresh MBs";
 559         case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:               return "Frame Level Rate Control Enable";
 560         case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:                  return "H264 MB Level Rate Control";
 561         case V4L2_CID_MPEG_VIDEO_HEADER_MODE:                   return "Sequence Header Mode";
 562         case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC:                   return "Max Number of Reference Pics";
 563         case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP:               return "H263 I-Frame QP Value";
 564         case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP:               return "H263 P-Frame QP Value";
 565         case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP:               return "H263 B-Frame QP Value";
 566         case V4L2_CID_MPEG_VIDEO_H263_MIN_QP:                   return "H263 Minimum QP Value";
 567         case V4L2_CID_MPEG_VIDEO_H263_MAX_QP:                   return "H263 Maximum QP Value";
 568         case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP:               return "H264 I-Frame QP Value";
 569         case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP:               return "H264 P-Frame QP Value";
 570         case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP:               return "H264 B-Frame QP Value";
 571         case V4L2_CID_MPEG_VIDEO_H264_MAX_QP:                   return "H264 Maximum QP Value";
 572         case V4L2_CID_MPEG_VIDEO_H264_MIN_QP:                   return "H264 Minimum QP Value";
 573         case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:            return "H264 8x8 Transform Enable";
 574         case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE:                 return "H264 CPB Buffer Size";
 575         case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:             return "H264 Entropy Mode";
 576         case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD:                 return "H264 I-Frame Period";
 577         case V4L2_CID_MPEG_VIDEO_H264_LEVEL:                    return "H264 Level";
 578         case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA:        return "H264 Loop Filter Alpha Offset";
 579         case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA:         return "H264 Loop Filter Beta Offset";
 580         case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:         return "H264 Loop Filter Mode";
 581         case V4L2_CID_MPEG_VIDEO_H264_PROFILE:                  return "H264 Profile";
 582         case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT:       return "Vertical Size of SAR";
 583         case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH:        return "Horizontal Size of SAR";
 584         case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:           return "Aspect Ratio VUI Enable";
 585         case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:              return "VUI Aspect Ratio IDC";
 586         case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP:              return "MPEG4 I-Frame QP Value";
 587         case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP:              return "MPEG4 P-Frame QP Value";
 588         case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP:              return "MPEG4 B-Frame QP Value";
 589         case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP:                  return "MPEG4 Minimum QP Value";
 590         case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP:                  return "MPEG4 Maximum QP Value";
 591         case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:                   return "MPEG4 Level";
 592         case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:                 return "MPEG4 Profile";
 593         case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:                    return "Quarter Pixel Search Enable";
 594         case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES:         return "Maximum Bytes in a Slice";
 595         case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB:            return "Number of MBs in a Slice";
 596         case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:              return "Slice Partitioning Method";
 597         case V4L2_CID_MPEG_VIDEO_VBV_SIZE:                      return "VBV Buffer Size";
 598         case V4L2_CID_MPEG_VIDEO_DEC_PTS:                       return "Video Decoder PTS";
 599         case V4L2_CID_MPEG_VIDEO_DEC_FRAME:                     return "Video Decoder Frame Count";
 600
 601         /* CAMERA controls */
 602         /* Keep the order of the 'case's the same as in videodev2.h! */
 603         case V4L2_CID_CAMERA_CLASS:             return "Camera Controls";
 604         case V4L2_CID_EXPOSURE_AUTO:            return "Auto Exposure";
 605         case V4L2_CID_EXPOSURE_ABSOLUTE:        return "Exposure Time, Absolute";
 606         case V4L2_CID_EXPOSURE_AUTO_PRIORITY:   return "Exposure, Dynamic Framerate";
 607         case V4L2_CID_PAN_RELATIVE:             return "Pan, Relative";
 608         case V4L2_CID_TILT_RELATIVE:            return "Tilt, Relative";
 609         case V4L2_CID_PAN_RESET:                return "Pan, Reset";
 610         case V4L2_CID_TILT_RESET:               return "Tilt, Reset";
 611         case V4L2_CID_PAN_ABSOLUTE:             return "Pan, Absolute";
 612         case V4L2_CID_TILT_ABSOLUTE:            return "Tilt, Absolute";
 613         case V4L2_CID_FOCUS_ABSOLUTE:           return "Focus, Absolute";
 614         case V4L2_CID_FOCUS_RELATIVE:           return "Focus, Relative";
 615         case V4L2_CID_FOCUS_AUTO:               return "Focus, Automatic";
 616         case V4L2_CID_ZOOM_ABSOLUTE:            return "Zoom, Absolute";
 617         case V4L2_CID_ZOOM_RELATIVE:            return "Zoom, Relative";
 618         case V4L2_CID_ZOOM_CONTINUOUS:          return "Zoom, Continuous";
 619         case V4L2_CID_PRIVACY:                  return "Privacy";
 620         case V4L2_CID_IRIS_ABSOLUTE:            return "Iris, Absolute";
 621         case V4L2_CID_IRIS_RELATIVE:            return "Iris, Relative";
 622         case V4L2_CID_AUTO_EXPOSURE_BIAS:       return "Auto Exposure, Bias";
 623         case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
 624         case V4L2_CID_WIDE_DYNAMIC_RANGE:       return "Wide Dynamic Range";
 625
 626         /* FM Radio Modulator control */
 627         /* Keep the order of the 'case's the same as in videodev2.h! */
 628         case V4L2_CID_FM_TX_CLASS:              return "FM Radio Modulator Controls";
 629         case V4L2_CID_RDS_TX_DEVIATION:         return "RDS Signal Deviation";
 630         case V4L2_CID_RDS_TX_PI:                return "RDS Program ID";
 631         case V4L2_CID_RDS_TX_PTY:               return "RDS Program Type";
 632         case V4L2_CID_RDS_TX_PS_NAME:           return "RDS PS Name";
 633         case V4L2_CID_RDS_TX_RADIO_TEXT:        return "RDS Radio Text";
 634         case V4L2_CID_AUDIO_LIMITER_ENABLED:    return "Audio Limiter Feature Enabled";
 635         case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
 636         case V4L2_CID_AUDIO_LIMITER_DEVIATION:  return "Audio Limiter Deviation";
 637         case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
 638         case V4L2_CID_AUDIO_COMPRESSION_GAIN:   return "Audio Compression Gain";
 639         case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
 640         case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
 641         case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
 642         case V4L2_CID_PILOT_TONE_ENABLED:       return "Pilot Tone Feature Enabled";
 643         case V4L2_CID_PILOT_TONE_DEVIATION:     return "Pilot Tone Deviation";
 644         case V4L2_CID_PILOT_TONE_FREQUENCY:     return "Pilot Tone Frequency";
 645         case V4L2_CID_TUNE_PREEMPHASIS:         return "Pre-Emphasis";
 646         case V4L2_CID_TUNE_POWER_LEVEL:         return "Tune Power Level";
 647         case V4L2_CID_TUNE_ANTENNA_CAPACITOR:   return "Tune Antenna Capacitor";
 648
 649         /* Flash controls */
 650         case V4L2_CID_FLASH_CLASS:              return "Flash Controls";
 651         case V4L2_CID_FLASH_LED_MODE:           return "LED Mode";
 652         case V4L2_CID_FLASH_STROBE_SOURCE:      return "Strobe Source";
 653         case V4L2_CID_FLASH_STROBE:             return "Strobe";
 654         case V4L2_CID_FLASH_STROBE_STOP:        return "Stop Strobe";
 655         case V4L2_CID_FLASH_STROBE_STATUS:      return "Strobe Status";
 656         case V4L2_CID_FLASH_TIMEOUT:            return "Strobe Timeout";
 657         case V4L2_CID_FLASH_INTENSITY:          return "Intensity, Flash Mode";
 658         case V4L2_CID_FLASH_TORCH_INTENSITY:    return "Intensity, Torch Mode";
 659         case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
 660         case V4L2_CID_FLASH_FAULT:              return "Faults";
 661         case V4L2_CID_FLASH_CHARGE:             return "Charge";
 662         case V4L2_CID_FLASH_READY:              return "Ready to Strobe";
 663
 664         /* JPEG encoder controls */
 665         /* Keep the order of the 'case's the same as in videodev2.h! */
 666         case V4L2_CID_JPEG_CLASS:               return "JPEG Compression Controls";
 667         case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:  return "Chroma Subsampling";
 668         case V4L2_CID_JPEG_RESTART_INTERVAL:    return "Restart Interval";
 669         case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
 670         case V4L2_CID_JPEG_ACTIVE_MARKER:       return "Active Markers";
 671
 672         /* Image source controls */
 673         case V4L2_CID_IMAGE_SOURCE_CLASS:       return "Image Source Controls";
 674         case V4L2_CID_VBLANK:                   return "Vertical Blanking";
 675         case V4L2_CID_HBLANK:                   return "Horizontal Blanking";
 676         case V4L2_CID_ANALOGUE_GAIN:            return "Analogue Gain";
 677
 678         /* Image processing controls */
 679         case V4L2_CID_IMAGE_PROC_CLASS:         return "Image Processing Controls";
 680         case V4L2_CID_LINK_FREQ:                return "Link Frequency";
 681         case V4L2_CID_PIXEL_RATE:               return "Pixel Rate";
 682
 683         default:
 684                 return NULL;
 685         }
 686 }
 687 EXPORT_SYMBOL(v4l2_ctrl_get_name);
 688
 689 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
 690                     s32 *min, s32 *max, s32 *step, s32 *def, u32 *flags)
 691 {
 692         *name = v4l2_ctrl_get_name(id);
 693         *flags = 0;
 694
 695         switch (id) {
 696         case V4L2_CID_AUDIO_MUTE:
 697         case V4L2_CID_AUDIO_LOUDNESS:
 698         case V4L2_CID_AUTO_WHITE_BALANCE:
 699         case V4L2_CID_AUTOGAIN:
 700         case V4L2_CID_HFLIP:
 701         case V4L2_CID_VFLIP:
 702         case V4L2_CID_HUE_AUTO:
 703         case V4L2_CID_CHROMA_AGC:
 704         case V4L2_CID_COLOR_KILLER:
 705         case V4L2_CID_MPEG_AUDIO_MUTE:
 706         case V4L2_CID_MPEG_VIDEO_MUTE:
 707         case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
 708         case V4L2_CID_MPEG_VIDEO_PULLDOWN:
 709         case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
 710         case V4L2_CID_FOCUS_AUTO:
 711         case V4L2_CID_PRIVACY:
 712         case V4L2_CID_AUDIO_LIMITER_ENABLED:
 713         case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
 714         case V4L2_CID_PILOT_TONE_ENABLED:
 715         case V4L2_CID_ILLUMINATORS_1:
 716         case V4L2_CID_ILLUMINATORS_2:
 717         case V4L2_CID_FLASH_STROBE_STATUS:
 718         case V4L2_CID_FLASH_CHARGE:
 719         case V4L2_CID_FLASH_READY:
 720         case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
 721         case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
 722         case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
 723         case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
 724         case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
 725         case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
 726         case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
 727         case V4L2_CID_WIDE_DYNAMIC_RANGE:
 728                 *type = V4L2_CTRL_TYPE_BOOLEAN;
 729                 *min = 0;
 730                 *max = *step = 1;
 731                 break;
 732         case V4L2_CID_PAN_RESET:
 733         case V4L2_CID_TILT_RESET:
 734         case V4L2_CID_FLASH_STROBE:
 735         case V4L2_CID_FLASH_STROBE_STOP:
 736                 *type = V4L2_CTRL_TYPE_BUTTON;
 737                 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
 738                 *min = *max = *step = *def = 0;
 739                 break;
 740         case V4L2_CID_POWER_LINE_FREQUENCY:
 741         case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
 742         case V4L2_CID_MPEG_AUDIO_ENCODING:
 743         case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
 744         case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
 745         case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
 746         case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
 747         case V4L2_CID_MPEG_AUDIO_MODE:
 748         case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
 749         case V4L2_CID_MPEG_AUDIO_EMPHASIS:
 750         case V4L2_CID_MPEG_AUDIO_CRC:
 751         case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
 752         case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
 753         case V4L2_CID_MPEG_VIDEO_ENCODING:
 754         case V4L2_CID_MPEG_VIDEO_ASPECT:
 755         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
 756         case V4L2_CID_MPEG_STREAM_TYPE:
 757         case V4L2_CID_MPEG_STREAM_VBI_FMT:
 758         case V4L2_CID_EXPOSURE_AUTO:
 759         case V4L2_CID_COLORFX:
 760         case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
 761         case V4L2_CID_TUNE_PREEMPHASIS:
 762         case V4L2_CID_FLASH_LED_MODE:
 763         case V4L2_CID_FLASH_STROBE_SOURCE:
 764         case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
 765         case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
 766         case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
 767         case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
 768         case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
 769         case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
 770         case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
 771         case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
 772         case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
 773         case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
 774                 *type = V4L2_CTRL_TYPE_MENU;
 775                 break;
 776         case V4L2_CID_LINK_FREQ:
 777                 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
 778                 break;
 779         case V4L2_CID_RDS_TX_PS_NAME:
 780         case V4L2_CID_RDS_TX_RADIO_TEXT:
 781                 *type = V4L2_CTRL_TYPE_STRING;
 782                 break;
 783         case V4L2_CID_AUTO_EXPOSURE_BIAS:
 784                 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
 785                 break;
 786         case V4L2_CID_USER_CLASS:
 787         case V4L2_CID_CAMERA_CLASS:
 788         case V4L2_CID_MPEG_CLASS:
 789         case V4L2_CID_FM_TX_CLASS:
 790         case V4L2_CID_FLASH_CLASS:
 791         case V4L2_CID_JPEG_CLASS:
 792         case V4L2_CID_IMAGE_SOURCE_CLASS:
 793         case V4L2_CID_IMAGE_PROC_CLASS:
 794                 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
 795                 /* You can neither read not write these */
 796                 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
 797                 *min = *max = *step = *def = 0;
 798                 break;
 799         case V4L2_CID_BG_COLOR:
 800                 *type = V4L2_CTRL_TYPE_INTEGER;
 801                 *step = 1;
 802                 *min = 0;
 803                 /* Max is calculated as RGB888 that is 2^24 */
 804                 *max = 0xFFFFFF;
 805                 break;
 806         case V4L2_CID_FLASH_FAULT:
 807         case V4L2_CID_JPEG_ACTIVE_MARKER:
 808                 *type = V4L2_CTRL_TYPE_BITMASK;
 809                 break;
 810         case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
 811         case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
 812                 *type = V4L2_CTRL_TYPE_INTEGER;
 813                 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
 814                 break;
 815         case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
 816         case V4L2_CID_MPEG_VIDEO_DEC_PTS:
 817                 *flags |= V4L2_CTRL_FLAG_VOLATILE;
 818                 /* Fall through */
 819         case V4L2_CID_PIXEL_RATE:
 820                 *type = V4L2_CTRL_TYPE_INTEGER64;
 821                 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
 822                 *min = *max = *step = *def = 0;
 823                 break;
 824         default:
 825                 *type = V4L2_CTRL_TYPE_INTEGER;
 826                 break;
 827         }
 828         switch (id) {
 829         case V4L2_CID_MPEG_AUDIO_ENCODING:
 830         case V4L2_CID_MPEG_AUDIO_MODE:
 831         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
 832         case V4L2_CID_MPEG_VIDEO_B_FRAMES:
 833         case V4L2_CID_MPEG_STREAM_TYPE:
 834                 *flags |= V4L2_CTRL_FLAG_UPDATE;
 835                 break;
 836         case V4L2_CID_AUDIO_VOLUME:
 837         case V4L2_CID_AUDIO_BALANCE:
 838         case V4L2_CID_AUDIO_BASS:
 839         case V4L2_CID_AUDIO_TREBLE:
 840         case V4L2_CID_BRIGHTNESS:
 841         case V4L2_CID_CONTRAST:
 842         case V4L2_CID_SATURATION:
 843         case V4L2_CID_HUE:
 844         case V4L2_CID_RED_BALANCE:
 845         case V4L2_CID_BLUE_BALANCE:
 846         case V4L2_CID_GAMMA:
 847         case V4L2_CID_SHARPNESS:
 848         case V4L2_CID_CHROMA_GAIN:
 849         case V4L2_CID_RDS_TX_DEVIATION:
 850         case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
 851         case V4L2_CID_AUDIO_LIMITER_DEVIATION:
 852         case V4L2_CID_AUDIO_COMPRESSION_GAIN:
 853         case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
 854         case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
 855         case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
 856         case V4L2_CID_PILOT_TONE_DEVIATION:
 857         case V4L2_CID_PILOT_TONE_FREQUENCY:
 858         case V4L2_CID_TUNE_POWER_LEVEL:
 859         case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
 860                 *flags |= V4L2_CTRL_FLAG_SLIDER;
 861                 break;
 862         case V4L2_CID_PAN_RELATIVE:
 863         case V4L2_CID_TILT_RELATIVE:
 864         case V4L2_CID_FOCUS_RELATIVE:
 865         case V4L2_CID_IRIS_RELATIVE:
 866         case V4L2_CID_ZOOM_RELATIVE:
 867                 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
 868                 break;
 869         case V4L2_CID_FLASH_STROBE_STATUS:
 870         case V4L2_CID_FLASH_READY:
 871                 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
 872                 break;
 873         }
 874 }
 875 EXPORT_SYMBOL(v4l2_ctrl_fill);
 876
 877 /* Helper function to determine whether the control type is compatible with
 878    VIDIOC_G/S_CTRL. */
 879 static bool type_is_int(const struct v4l2_ctrl *ctrl)
 880 {
 881         switch (ctrl->type) {
 882         case V4L2_CTRL_TYPE_INTEGER64:
 883         case V4L2_CTRL_TYPE_STRING:
 884                 /* Nope, these need v4l2_ext_control */
 885                 return false;
 886         default:
 887                 return true;
 888         }
 889 }
 890
 891 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
 892 {
 893         memset(ev->reserved, 0, sizeof(ev->reserved));
 894         ev->type = V4L2_EVENT_CTRL;
 895         ev->id = ctrl->id;
 896         ev->u.ctrl.changes = changes;
 897         ev->u.ctrl.type = ctrl->type;
 898         ev->u.ctrl.flags = ctrl->flags;
 899         if (ctrl->type == V4L2_CTRL_TYPE_STRING)
 900                 ev->u.ctrl.value64 = 0;
 901         else
 902                 ev->u.ctrl.value64 = ctrl->cur.val64;
 903         ev->u.ctrl.minimum = ctrl->minimum;
 904         ev->u.ctrl.maximum = ctrl->maximum;
 905         if (ctrl->type == V4L2_CTRL_TYPE_MENU
 906             || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
 907                 ev->u.ctrl.step = 1;
 908         else
 909                 ev->u.ctrl.step = ctrl->step;
 910         ev->u.ctrl.default_value = ctrl->default_value;
 911 }
 912
 913 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
 914 {
 915         struct v4l2_event ev;
 916         struct v4l2_subscribed_event *sev;
 917
 918         if (list_empty(&ctrl->ev_subs))
 919                 return;
 920         fill_event(&ev, ctrl, changes);
 921
 922         list_for_each_entry(sev, &ctrl->ev_subs, node)
 923                 if (sev->fh != fh ||
 924                     (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
 925                         v4l2_event_queue_fh(sev->fh, &ev);
 926 }
 927
 928 /* Helper function: copy the current control value back to the caller */
 929 static int cur_to_user(struct v4l2_ext_control *c,
 930                        struct v4l2_ctrl *ctrl)
 931 {
 932         u32 len;
 933
 934         switch (ctrl->type) {
 935         case V4L2_CTRL_TYPE_STRING:
 936                 len = strlen(ctrl->cur.string);
 937                 if (c->size < len + 1) {
 938                         c->size = len + 1;
 939                         return -ENOSPC;
 940                 }
 941                 return copy_to_user(c->string, ctrl->cur.string,
 942                                                 len + 1) ? -EFAULT : 0;
 943         case V4L2_CTRL_TYPE_INTEGER64:
 944                 c->value64 = ctrl->cur.val64;
 945                 break;
 946         default:
 947                 c->value = ctrl->cur.val;
 948                 break;
 949         }
 950         return 0;
 951 }
 952
 953 /* Helper function: copy the caller-provider value as the new control value */
 954 static int user_to_new(struct v4l2_ext_control *c,
 955                        struct v4l2_ctrl *ctrl)
 956 {
 957         int ret;
 958         u32 size;
 959
 960         ctrl->is_new = 1;
 961         switch (ctrl->type) {
 962         case V4L2_CTRL_TYPE_INTEGER64:
 963                 ctrl->val64 = c->value64;
 964                 break;
 965         case V4L2_CTRL_TYPE_STRING:
 966                 size = c->size;
 967                 if (size == 0)
 968                         return -ERANGE;
 969                 if (size > ctrl->maximum + 1)
 970                         size = ctrl->maximum + 1;
 971                 ret = copy_from_user(ctrl->string, c->string, size);
 972                 if (!ret) {
 973                         char last = ctrl->string[size - 1];
 974
 975                         ctrl->string[size - 1] = 0;
 976                         /* If the string was longer than ctrl->maximum,
 977                            then return an error. */
 978                         if (strlen(ctrl->string) == ctrl->maximum && last)
 979                                 return -ERANGE;
 980                 }
 981                 return ret ? -EFAULT : 0;
 982         default:
 983                 ctrl->val = c->value;
 984                 break;
 985         }
 986         return 0;
 987 }
 988
 989 /* Helper function: copy the new control value back to the caller */
 990 static int new_to_user(struct v4l2_ext_control *c,
 991                        struct v4l2_ctrl *ctrl)
 992 {
 993         u32 len;
 994
 995         switch (ctrl->type) {
 996         case V4L2_CTRL_TYPE_STRING:
 997                 len = strlen(ctrl->string);
 998                 if (c->size < len + 1) {
 999                         c->size = ctrl->maximum + 1;
1000                         return -ENOSPC;
1001                 }
1002                 return copy_to_user(c->string, ctrl->string,
1003                                                 len + 1) ? -EFAULT : 0;
1004         case V4L2_CTRL_TYPE_INTEGER64:
1005                 c->value64 = ctrl->val64;
1006                 break;
1007         default:
1008                 c->value = ctrl->val;
1009                 break;
1010         }
1011         return 0;
1012 }
1013
1014 /* Copy the new value to the current value. */
1015 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
1016                                                 bool update_inactive)
1017 {
1018         bool changed = false;
1019
1020         if (ctrl == NULL)
1021                 return;
1022         switch (ctrl->type) {
1023         case V4L2_CTRL_TYPE_BUTTON:
1024                 changed = true;
1025                 break;
1026         case V4L2_CTRL_TYPE_STRING:
1027                 /* strings are always 0-terminated */
1028                 changed = strcmp(ctrl->string, ctrl->cur.string);
1029                 strcpy(ctrl->cur.string, ctrl->string);
1030                 break;
1031         case V4L2_CTRL_TYPE_INTEGER64:
1032                 changed = ctrl->val64 != ctrl->cur.val64;
1033                 ctrl->cur.val64 = ctrl->val64;
1034                 break;
1035         default:
1036                 changed = ctrl->val != ctrl->cur.val;
1037                 ctrl->cur.val = ctrl->val;
1038                 break;
1039         }
1040         if (update_inactive) {
1041                 /* Note: update_inactive can only be true for auto clusters. */
1042                 ctrl->flags &=
1043                         ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1044                 if (!is_cur_manual(ctrl->cluster[0])) {
1045                         ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1046                         if (ctrl->cluster[0]->has_volatiles)
1047                                 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1048                 }
1049                 fh = NULL;
1050         }
1051         if (changed || update_inactive) {
1052                 /* If a control was changed that was not one of the controls
1053                    modified by the application, then send the event to all. */
1054                 if (!ctrl->is_new)
1055                         fh = NULL;
1056                 send_event(fh, ctrl,
1057                         (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) |
1058                         (update_inactive ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
1059         }
1060 }
1061
1062 /* Copy the current value to the new value */
1063 static void cur_to_new(struct v4l2_ctrl *ctrl)
1064 {
1065         if (ctrl == NULL)
1066                 return;
1067         switch (ctrl->type) {
1068         case V4L2_CTRL_TYPE_STRING:
1069                 /* strings are always 0-terminated */
1070                 strcpy(ctrl->string, ctrl->cur.string);
1071                 break;
1072         case V4L2_CTRL_TYPE_INTEGER64:
1073                 ctrl->val64 = ctrl->cur.val64;
1074                 break;
1075         default:
1076                 ctrl->val = ctrl->cur.val;
1077                 break;
1078         }
1079 }
1080
1081 /* Return non-zero if one or more of the controls in the cluster has a new
1082    value that differs from the current value. */
1083 static int cluster_changed(struct v4l2_ctrl *master)
1084 {
1085         int diff = 0;
1086         int i;
1087
1088         for (i = 0; !diff && i < master->ncontrols; i++) {
1089                 struct v4l2_ctrl *ctrl = master->cluster[i];
1090
1091                 if (ctrl == NULL)
1092                         continue;
1093                 switch (ctrl->type) {
1094                 case V4L2_CTRL_TYPE_BUTTON:
1095                         /* Button controls are always 'different' */
1096                         return 1;
1097                 case V4L2_CTRL_TYPE_STRING:
1098                         /* strings are always 0-terminated */
1099                         diff = strcmp(ctrl->string, ctrl->cur.string);
1100                         break;
1101                 case V4L2_CTRL_TYPE_INTEGER64:
1102                         diff = ctrl->val64 != ctrl->cur.val64;
1103                         break;
1104                 default:
1105                         diff = ctrl->val != ctrl->cur.val;
1106                         break;
1107                 }
1108         }
1109         return diff;
1110 }
1111
1112 /* Validate integer-type control */
1113 static int validate_new_int(const struct v4l2_ctrl *ctrl, s32 *pval)
1114 {
1115         s32 val = *pval;
1116         u32 offset;
1117
1118         switch (ctrl->type) {
1119         case V4L2_CTRL_TYPE_INTEGER:
1120                 /* Round towards the closest legal value */
1121                 val += ctrl->step / 2;
1122                 if (val < ctrl->minimum)
1123                         val = ctrl->minimum;
1124                 if (val > ctrl->maximum)
1125                         val = ctrl->maximum;
1126                 offset = val - ctrl->minimum;
1127                 offset = ctrl->step * (offset / ctrl->step);
1128                 val = ctrl->minimum + offset;
1129                 *pval = val;
1130                 return 0;
1131
1132         case V4L2_CTRL_TYPE_BOOLEAN:
1133                 *pval = !!val;
1134                 return 0;
1135
1136         case V4L2_CTRL_TYPE_MENU:
1137         case V4L2_CTRL_TYPE_INTEGER_MENU:
1138                 if (val < ctrl->minimum || val > ctrl->maximum)
1139                         return -ERANGE;
1140                 if (ctrl->menu_skip_mask & (1 << val))
1141                         return -EINVAL;
1142                 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1143                     ctrl->qmenu[val][0] == '\0')
1144                         return -EINVAL;
1145                 return 0;
1146
1147         case V4L2_CTRL_TYPE_BITMASK:
1148                 *pval &= ctrl->maximum;
1149                 return 0;
1150
1151         case V4L2_CTRL_TYPE_BUTTON:
1152         case V4L2_CTRL_TYPE_CTRL_CLASS:
1153                 *pval = 0;
1154                 return 0;
1155
1156         default:
1157                 return -EINVAL;
1158         }
1159 }
1160
1161 /* Validate a new control */
1162 static int validate_new(const struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
1163 {
1164         char *s = c->string;
1165         size_t len;
1166
1167         switch (ctrl->type) {
1168         case V4L2_CTRL_TYPE_INTEGER:
1169         case V4L2_CTRL_TYPE_BOOLEAN:
1170         case V4L2_CTRL_TYPE_MENU:
1171         case V4L2_CTRL_TYPE_INTEGER_MENU:
1172         case V4L2_CTRL_TYPE_BITMASK:
1173         case V4L2_CTRL_TYPE_BUTTON:
1174         case V4L2_CTRL_TYPE_CTRL_CLASS:
1175                 return validate_new_int(ctrl, &c->value);
1176
1177         case V4L2_CTRL_TYPE_INTEGER64:
1178                 return 0;
1179
1180         case V4L2_CTRL_TYPE_STRING:
1181                 len = strlen(s);
1182                 if (len < ctrl->minimum)
1183                         return -ERANGE;
1184                 if ((len - ctrl->minimum) % ctrl->step)
1185                         return -ERANGE;
1186                 return 0;
1187
1188         default:
1189                 return -EINVAL;
1190         }
1191 }
1192
1193 static inline u32 node2id(struct list_head *node)
1194 {
1195         return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1196 }
1197
1198 /* Set the handler's error code if it wasn't set earlier already */
1199 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1200 {
1201         if (hdl->error == 0)
1202                 hdl->error = err;
1203         return err;
1204 }
1205
1206 /* Initialize the handler */
1207 int v4l2_ctrl_handler_init(struct v4l2_ctrl_handler *hdl,
1208                            unsigned nr_of_controls_hint)
1209 {
1210         hdl->lock = &hdl->_lock;
1211         mutex_init(hdl->lock);
1212         INIT_LIST_HEAD(&hdl->ctrls);
1213         INIT_LIST_HEAD(&hdl->ctrl_refs);
1214         hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1215         hdl->buckets = kcalloc(hdl->nr_of_buckets, sizeof(hdl->buckets[0]),
1216                                GFP_KERNEL);
1217         hdl->error = hdl->buckets ? 0 : -ENOMEM;
1218         return hdl->error;
1219 }
1220 EXPORT_SYMBOL(v4l2_ctrl_handler_init);
1221
1222 /* Free all controls and control refs */
1223 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1224 {
1225         struct v4l2_ctrl_ref *ref, *next_ref;
1226         struct v4l2_ctrl *ctrl, *next_ctrl;
1227         struct v4l2_subscribed_event *sev, *next_sev;
1228
1229         if (hdl == NULL || hdl->buckets == NULL)
1230                 return;
1231
1232         mutex_lock(hdl->lock);
1233         /* Free all nodes */
1234         list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1235                 list_del(&ref->node);
1236                 kfree(ref);
1237         }
1238         /* Free all controls owned by the handler */
1239         list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1240                 list_del(&ctrl->node);
1241                 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1242                         list_del(&sev->node);
1243                 kfree(ctrl);
1244         }
1245         kfree(hdl->buckets);
1246         hdl->buckets = NULL;
1247         hdl->cached = NULL;
1248         hdl->error = 0;
1249         mutex_unlock(hdl->lock);
1250 }
1251 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1252
1253 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1254    be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1255    with applications that do not use the NEXT_CTRL flag.
1256
1257    We just find the n-th private user control. It's O(N), but that should not
1258    be an issue in this particular case. */
1259 static struct v4l2_ctrl_ref *find_private_ref(
1260                 struct v4l2_ctrl_handler *hdl, u32 id)
1261 {
1262         struct v4l2_ctrl_ref *ref;
1263
1264         id -= V4L2_CID_PRIVATE_BASE;
1265         list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1266                 /* Search for private user controls that are compatible with
1267                    VIDIOC_G/S_CTRL. */
1268                 if (V4L2_CTRL_ID2CLASS(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1269                     V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1270                         if (!type_is_int(ref->ctrl))
1271                                 continue;
1272                         if (id == 0)
1273                                 return ref;
1274                         id--;
1275                 }
1276         }
1277         return NULL;
1278 }
1279
1280 /* Find a control with the given ID. */
1281 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1282 {
1283         struct v4l2_ctrl_ref *ref;
1284         int bucket;
1285
1286         id &= V4L2_CTRL_ID_MASK;
1287
1288         /* Old-style private controls need special handling */
1289         if (id >= V4L2_CID_PRIVATE_BASE)
1290                 return find_private_ref(hdl, id);
1291         bucket = id % hdl->nr_of_buckets;
1292
1293         /* Simple optimization: cache the last control found */
1294         if (hdl->cached && hdl->cached->ctrl->id == id)
1295                 return hdl->cached;
1296
1297         /* Not in cache, search the hash */
1298         ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1299         while (ref && ref->ctrl->id != id)
1300                 ref = ref->next;
1301
1302         if (ref)
1303                 hdl->cached = ref; /* cache it! */
1304         return ref;
1305 }
1306
1307 /* Find a control with the given ID. Take the handler's lock first. */
1308 static struct v4l2_ctrl_ref *find_ref_lock(
1309                 struct v4l2_ctrl_handler *hdl, u32 id)
1310 {
1311         struct v4l2_ctrl_ref *ref = NULL;
1312
1313         if (hdl) {
1314                 mutex_lock(hdl->lock);
1315                 ref = find_ref(hdl, id);
1316                 mutex_unlock(hdl->lock);
1317         }
1318         return ref;
1319 }
1320
1321 /* Find a control with the given ID. */
1322 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1323 {
1324         struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1325
1326         return ref ? ref->ctrl : NULL;
1327 }
1328 EXPORT_SYMBOL(v4l2_ctrl_find);
1329
1330 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1331 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1332                            struct v4l2_ctrl *ctrl)
1333 {
1334         struct v4l2_ctrl_ref *ref;
1335         struct v4l2_ctrl_ref *new_ref;
1336         u32 id = ctrl->id;
1337         u32 class_ctrl = V4L2_CTRL_ID2CLASS(id) | 1;
1338         int bucket = id % hdl->nr_of_buckets;   /* which bucket to use */
1339
1340         /* Automatically add the control class if it is not yet present. */
1341         if (id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1342                 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1343                         return hdl->error;
1344
1345         if (hdl->error)
1346                 return hdl->error;
1347
1348         new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1349         if (!new_ref)
1350                 return handler_set_err(hdl, -ENOMEM);
1351         new_ref->ctrl = ctrl;
1352         if (ctrl->handler == hdl) {
1353                 /* By default each control starts in a cluster of its own.
1354                    new_ref->ctrl is basically a cluster array with one
1355                    element, so that's perfect to use as the cluster pointer.
1356                    But only do this for the handler that owns the control. */
1357                 ctrl->cluster = &new_ref->ctrl;
1358                 ctrl->ncontrols = 1;
1359         }
1360
1361         INIT_LIST_HEAD(&new_ref->node);
1362
1363         mutex_lock(hdl->lock);
1364
1365         /* Add immediately at the end of the list if the list is empty, or if
1366            the last element in the list has a lower ID.
1367            This ensures that when elements are added in ascending order the
1368            insertion is an O(1) operation. */
1369         if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1370                 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1371                 goto insert_in_hash;
1372         }
1373
1374         /* Find insert position in sorted list */
1375         list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1376                 if (ref->ctrl->id < id)
1377                         continue;
1378                 /* Don't add duplicates */
1379                 if (ref->ctrl->id == id) {
1380                         kfree(new_ref);
1381                         goto unlock;
1382                 }
1383                 list_add(&new_ref->node, ref->node.prev);
1384                 break;
1385         }
1386
1387 insert_in_hash:
1388         /* Insert the control node in the hash */
1389         new_ref->next = hdl->buckets[bucket];
1390         hdl->buckets[bucket] = new_ref;
1391
1392 unlock:
1393         mutex_unlock(hdl->lock);
1394         return 0;
1395 }
1396
1397 /* Add a new control */
1398 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1399                         const struct v4l2_ctrl_ops *ops,
1400                         u32 id, const char *name, enum v4l2_ctrl_type type,
1401                         s32 min, s32 max, u32 step, s32 def,
1402                         u32 flags, const char * const *qmenu,
1403                         const s64 *qmenu_int, void *priv)
1404 {
1405         struct v4l2_ctrl *ctrl;
1406         unsigned sz_extra = 0;
1407
1408         if (hdl->error)
1409                 return NULL;
1410
1411         /* Sanity checks */
1412         if (id == 0 || name == NULL || id >= V4L2_CID_PRIVATE_BASE ||
1413             (type == V4L2_CTRL_TYPE_INTEGER && step == 0) ||
1414             (type == V4L2_CTRL_TYPE_BITMASK && max == 0) ||
1415             (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1416             (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL) ||
1417             (type == V4L2_CTRL_TYPE_STRING && max == 0)) {
1418                 handler_set_err(hdl, -ERANGE);
1419                 return NULL;
1420         }
1421         if (type != V4L2_CTRL_TYPE_BITMASK && max < min) {
1422                 handler_set_err(hdl, -ERANGE);
1423                 return NULL;
1424         }
1425         if ((type == V4L2_CTRL_TYPE_INTEGER ||
1426              type == V4L2_CTRL_TYPE_MENU ||
1427              type == V4L2_CTRL_TYPE_INTEGER_MENU ||
1428              type == V4L2_CTRL_TYPE_BOOLEAN) &&
1429             (def < min || def > max)) {
1430                 handler_set_err(hdl, -ERANGE);
1431                 return NULL;
1432         }
1433         if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
1434                 handler_set_err(hdl, -ERANGE);
1435                 return NULL;
1436         }
1437
1438         if (type == V4L2_CTRL_TYPE_BUTTON)
1439                 flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
1440         else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
1441                 flags |= V4L2_CTRL_FLAG_READ_ONLY;
1442         else if (type == V4L2_CTRL_TYPE_STRING)
1443                 sz_extra += 2 * (max + 1);
1444
1445         ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
1446         if (ctrl == NULL) {
1447                 handler_set_err(hdl, -ENOMEM);
1448                 return NULL;
1449         }
1450
1451         INIT_LIST_HEAD(&ctrl->node);
1452         INIT_LIST_HEAD(&ctrl->ev_subs);
1453         ctrl->handler = hdl;
1454         ctrl->ops = ops;
1455         ctrl->id = id;
1456         ctrl->name = name;
1457         ctrl->type = type;
1458         ctrl->flags = flags;
1459         ctrl->minimum = min;
1460         ctrl->maximum = max;
1461         ctrl->step = step;
1462         if (type == V4L2_CTRL_TYPE_MENU)
1463                 ctrl->qmenu = qmenu;
1464         else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
1465                 ctrl->qmenu_int = qmenu_int;
1466         ctrl->priv = priv;
1467         ctrl->cur.val = ctrl->val = ctrl->default_value = def;
1468
1469         if (ctrl->type == V4L2_CTRL_TYPE_STRING) {
1470                 ctrl->cur.string = (char *)&ctrl[1] + sz_extra - (max + 1);
1471                 ctrl->string = (char *)&ctrl[1] + sz_extra - 2 * (max + 1);
1472                 if (ctrl->minimum)
1473                         memset(ctrl->cur.string, ' ', ctrl->minimum);
1474         }
1475         if (handler_new_ref(hdl, ctrl)) {
1476                 kfree(ctrl);
1477                 return NULL;
1478         }
1479         mutex_lock(hdl->lock);
1480         list_add_tail(&ctrl->node, &hdl->ctrls);
1481         mutex_unlock(hdl->lock);
1482         return ctrl;
1483 }
1484
1485 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
1486                         const struct v4l2_ctrl_config *cfg, void *priv)
1487 {
1488         bool is_menu;
1489         struct v4l2_ctrl *ctrl;
1490         const char *name = cfg->name;
1491         const char * const *qmenu = cfg->qmenu;
1492         const s64 *qmenu_int = cfg->qmenu_int;
1493         enum v4l2_ctrl_type type = cfg->type;
1494         u32 flags = cfg->flags;
1495         s32 min = cfg->min;
1496         s32 max = cfg->max;
1497         u32 step = cfg->step;
1498         s32 def = cfg->def;
1499
1500         if (name == NULL)
1501                 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
1502                                                                 &def, &flags);
1503
1504         is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU ||
1505                    cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU);
1506         if (is_menu)
1507                 WARN_ON(step);
1508         else
1509                 WARN_ON(cfg->menu_skip_mask);
1510         if (cfg->type == V4L2_CTRL_TYPE_MENU && qmenu == NULL)
1511                 qmenu = v4l2_ctrl_get_menu(cfg->id);
1512         else if (cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU &&
1513                  qmenu_int == NULL) {
1514                 handler_set_err(hdl, -EINVAL);
1515                 return NULL;
1516         }
1517
1518         ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->id, name,
1519                         type, min, max,
1520                         is_menu ? cfg->menu_skip_mask : step,
1521                         def, flags, qmenu, qmenu_int, priv);
1522         if (ctrl)
1523                 ctrl->is_private = cfg->is_private;
1524         return ctrl;
1525 }
1526 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
1527
1528 /* Helper function for standard non-menu controls */
1529 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
1530                         const struct v4l2_ctrl_ops *ops,
1531                         u32 id, s32 min, s32 max, u32 step, s32 def)
1532 {
1533         const char *name;
1534         enum v4l2_ctrl_type type;
1535         u32 flags;
1536
1537         v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1538         if (type == V4L2_CTRL_TYPE_MENU
1539             || type == V4L2_CTRL_TYPE_INTEGER_MENU) {
1540                 handler_set_err(hdl, -EINVAL);
1541                 return NULL;
1542         }
1543         return v4l2_ctrl_new(hdl, ops, id, name, type,
1544                              min, max, step, def, flags, NULL, NULL, NULL);
1545 }
1546 EXPORT_SYMBOL(v4l2_ctrl_new_std);
1547
1548 /* Helper function for standard menu controls */
1549 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
1550                         const struct v4l2_ctrl_ops *ops,
1551                         u32 id, s32 max, s32 mask, s32 def)
1552 {
1553         const char * const *qmenu = v4l2_ctrl_get_menu(id);
1554         const char *name;
1555         enum v4l2_ctrl_type type;
1556         s32 min;
1557         s32 step;
1558         u32 flags;
1559
1560         v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1561         if (type != V4L2_CTRL_TYPE_MENU) {
1562                 handler_set_err(hdl, -EINVAL);
1563                 return NULL;
1564         }
1565         return v4l2_ctrl_new(hdl, ops, id, name, type,
1566                              0, max, mask, def, flags, qmenu, NULL, NULL);
1567 }
1568 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
1569
1570 /* Helper function for standard integer menu controls */
1571 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
1572                         const struct v4l2_ctrl_ops *ops,
1573                         u32 id, s32 max, s32 def, const s64 *qmenu_int)
1574 {
1575         const char *name;
1576         enum v4l2_ctrl_type type;
1577         s32 min;
1578         s32 step;
1579         u32 flags;
1580
1581         v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1582         if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
1583                 handler_set_err(hdl, -EINVAL);
1584                 return NULL;
1585         }
1586         return v4l2_ctrl_new(hdl, ops, id, name, type,
1587                              0, max, 0, def, flags, NULL, qmenu_int, NULL);
1588 }
1589 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
1590
1591 /* Add a control from another handler to this handler */
1592 struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
1593                                           struct v4l2_ctrl *ctrl)
1594 {
1595         if (hdl == NULL || hdl->error)
1596                 return NULL;
1597         if (ctrl == NULL) {
1598                 handler_set_err(hdl, -EINVAL);
1599                 return NULL;
1600         }
1601         if (ctrl->handler == hdl)
1602                 return ctrl;
1603         return handler_new_ref(hdl, ctrl) ? NULL : ctrl;
1604 }
1605 EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
1606
1607 /* Add the controls from another handler to our own. */
1608 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
1609                           struct v4l2_ctrl_handler *add)
1610 {
1611         struct v4l2_ctrl_ref *ref;
1612         int ret = 0;
1613
1614         /* Do nothing if either handler is NULL or if they are the same */
1615         if (!hdl || !add || hdl == add)
1616                 return 0;
1617         if (hdl->error)
1618                 return hdl->error;
1619         mutex_lock(add->lock);
1620         list_for_each_entry(ref, &add->ctrl_refs, node) {
1621                 struct v4l2_ctrl *ctrl = ref->ctrl;
1622
1623                 /* Skip handler-private controls. */
1624                 if (ctrl->is_private)
1625                         continue;
1626                 /* And control classes */
1627                 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
1628                         continue;
1629                 ret = handler_new_ref(hdl, ctrl);
1630                 if (ret)
1631                         break;
1632         }
1633         mutex_unlock(add->lock);
1634         return ret;
1635 }
1636 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
1637
1638 /* Cluster controls */
1639 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
1640 {
1641         bool has_volatiles = false;
1642         int i;
1643
1644         /* The first control is the master control and it must not be NULL */
1645         BUG_ON(ncontrols == 0 || controls[0] == NULL);
1646
1647         for (i = 0; i < ncontrols; i++) {
1648                 if (controls[i]) {
1649                         controls[i]->cluster = controls;
1650                         controls[i]->ncontrols = ncontrols;
1651                         if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
1652                                 has_volatiles = true;
1653                 }
1654         }
1655         controls[0]->has_volatiles = has_volatiles;
1656 }
1657 EXPORT_SYMBOL(v4l2_ctrl_cluster);
1658
1659 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
1660                             u8 manual_val, bool set_volatile)
1661 {
1662         struct v4l2_ctrl *master = controls[0];
1663         u32 flag = 0;
1664         int i;
1665
1666         v4l2_ctrl_cluster(ncontrols, controls);
1667         WARN_ON(ncontrols <= 1);
1668         WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
1669         WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
1670         master->is_auto = true;
1671         master->has_volatiles = set_volatile;
1672         master->manual_mode_value = manual_val;
1673         master->flags |= V4L2_CTRL_FLAG_UPDATE;
1674
1675         if (!is_cur_manual(master))
1676                 flag = V4L2_CTRL_FLAG_INACTIVE |
1677                         (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
1678
1679         for (i = 1; i < ncontrols; i++)
1680                 if (controls[i])
1681                         controls[i]->flags |= flag;
1682 }
1683 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
1684
1685 /* Activate/deactivate a control. */
1686 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
1687 {
1688         /* invert since the actual flag is called 'inactive' */
1689         bool inactive = !active;
1690         bool old;
1691
1692         if (ctrl == NULL)
1693                 return;
1694
1695         if (inactive)
1696                 /* set V4L2_CTRL_FLAG_INACTIVE */
1697                 old = test_and_set_bit(4, &ctrl->flags);
1698         else
1699                 /* clear V4L2_CTRL_FLAG_INACTIVE */
1700                 old = test_and_clear_bit(4, &ctrl->flags);
1701         if (old != inactive)
1702                 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
1703 }
1704 EXPORT_SYMBOL(v4l2_ctrl_activate);
1705
1706 /* Grab/ungrab a control.
1707    Typically used when streaming starts and you want to grab controls,
1708    preventing the user from changing them.
1709
1710    Just call this and the framework will block any attempts to change
1711    these controls. */
1712 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
1713 {
1714         bool old;
1715
1716         if (ctrl == NULL)
1717                 return;
1718
1719         v4l2_ctrl_lock(ctrl);
1720         if (grabbed)
1721                 /* set V4L2_CTRL_FLAG_GRABBED */
1722                 old = test_and_set_bit(1, &ctrl->flags);
1723         else
1724                 /* clear V4L2_CTRL_FLAG_GRABBED */
1725                 old = test_and_clear_bit(1, &ctrl->flags);
1726         if (old != grabbed)
1727                 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
1728         v4l2_ctrl_unlock(ctrl);
1729 }
1730 EXPORT_SYMBOL(v4l2_ctrl_grab);
1731
1732 /* Log the control name and value */
1733 static void log_ctrl(const struct v4l2_ctrl *ctrl,
1734                      const char *prefix, const char *colon)
1735 {
1736         if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
1737                 return;
1738         if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
1739                 return;
1740
1741         printk(KERN_INFO "%s%s%s: ", prefix, colon, ctrl->name);
1742
1743         switch (ctrl->type) {
1744         case V4L2_CTRL_TYPE_INTEGER:
1745                 printk(KERN_CONT "%d", ctrl->cur.val);
1746                 break;
1747         case V4L2_CTRL_TYPE_BOOLEAN:
1748                 printk(KERN_CONT "%s", ctrl->cur.val ? "true" : "false");
1749                 break;
1750         case V4L2_CTRL_TYPE_MENU:
1751                 printk(KERN_CONT "%s", ctrl->qmenu[ctrl->cur.val]);
1752                 break;
1753         case V4L2_CTRL_TYPE_INTEGER_MENU:
1754                 printk(KERN_CONT "%lld", ctrl->qmenu_int[ctrl->cur.val]);
1755                 break;
1756         case V4L2_CTRL_TYPE_BITMASK:
1757                 printk(KERN_CONT "0x%08x", ctrl->cur.val);
1758                 break;
1759         case V4L2_CTRL_TYPE_INTEGER64:
1760                 printk(KERN_CONT "%lld", ctrl->cur.val64);
1761                 break;
1762         case V4L2_CTRL_TYPE_STRING:
1763                 printk(KERN_CONT "%s", ctrl->cur.string);
1764                 break;
1765         default:
1766                 printk(KERN_CONT "unknown type %d", ctrl->type);
1767                 break;
1768         }
1769         if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
1770                            V4L2_CTRL_FLAG_GRABBED |
1771                            V4L2_CTRL_FLAG_VOLATILE)) {
1772                 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
1773                         printk(KERN_CONT " inactive");
1774                 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
1775                         printk(KERN_CONT " grabbed");
1776                 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
1777                         printk(KERN_CONT " volatile");
1778         }
1779         printk(KERN_CONT "\n");
1780 }
1781
1782 /* Log all controls owned by the handler */
1783 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
1784                                   const char *prefix)
1785 {
1786         struct v4l2_ctrl *ctrl;
1787         const char *colon = "";
1788         int len;
1789
1790         if (hdl == NULL)
1791                 return;
1792         if (prefix == NULL)
1793                 prefix = "";
1794         len = strlen(prefix);
1795         if (len && prefix[len - 1] != ' ')
1796                 colon = ": ";
1797         mutex_lock(hdl->lock);
1798         list_for_each_entry(ctrl, &hdl->ctrls, node)
1799                 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
1800                         log_ctrl(ctrl, prefix, colon);
1801         mutex_unlock(hdl->lock);
1802 }
1803 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
1804
1805 /* Call s_ctrl for all controls owned by the handler */
1806 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
1807 {
1808         struct v4l2_ctrl *ctrl;
1809         int ret = 0;
1810
1811         if (hdl == NULL)
1812                 return 0;
1813         mutex_lock(hdl->lock);
1814         list_for_each_entry(ctrl, &hdl->ctrls, node)
1815                 ctrl->done = false;
1816
1817         list_for_each_entry(ctrl, &hdl->ctrls, node) {
1818                 struct v4l2_ctrl *master = ctrl->cluster[0];
1819                 int i;
1820
1821                 /* Skip if this control was already handled by a cluster. */
1822                 /* Skip button controls and read-only controls. */
1823                 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
1824                     (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
1825                         continue;
1826
1827                 for (i = 0; i < master->ncontrols; i++) {
1828                         if (master->cluster[i]) {
1829                                 cur_to_new(master->cluster[i]);
1830                                 master->cluster[i]->is_new = 1;
1831                                 master->cluster[i]->done = true;
1832                         }
1833                 }
1834                 ret = call_op(master, s_ctrl);
1835                 if (ret)
1836                         break;
1837         }
1838         mutex_unlock(hdl->lock);
1839         return ret;
1840 }
1841 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
1842
1843 /* Implement VIDIOC_QUERYCTRL */
1844 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
1845 {
1846         u32 id = qc->id & V4L2_CTRL_ID_MASK;
1847         struct v4l2_ctrl_ref *ref;
1848         struct v4l2_ctrl *ctrl;
1849
1850         if (hdl == NULL)
1851                 return -EINVAL;
1852
1853         mutex_lock(hdl->lock);
1854
1855         /* Try to find it */
1856         ref = find_ref(hdl, id);
1857
1858         if ((qc->id & V4L2_CTRL_FLAG_NEXT_CTRL) && !list_empty(&hdl->ctrl_refs)) {
1859                 /* Find the next control with ID > qc->id */
1860
1861                 /* Did we reach the end of the control list? */
1862                 if (id >= node2id(hdl->ctrl_refs.prev)) {
1863                         ref = NULL; /* Yes, so there is no next control */
1864                 } else if (ref) {
1865                         /* We found a control with the given ID, so just get
1866                            the next one in the list. */
1867                         ref = list_entry(ref->node.next, typeof(*ref), node);
1868                 } else {
1869                         /* No control with the given ID exists, so start
1870                            searching for the next largest ID. We know there
1871                            is one, otherwise the first 'if' above would have
1872                            been true. */
1873                         list_for_each_entry(ref, &hdl->ctrl_refs, node)
1874                                 if (id < ref->ctrl->id)
1875                                         break;
1876                 }
1877         }
1878         mutex_unlock(hdl->lock);
1879         if (!ref)
1880                 return -EINVAL;
1881
1882         ctrl = ref->ctrl;
1883         memset(qc, 0, sizeof(*qc));
1884         if (id >= V4L2_CID_PRIVATE_BASE)
1885                 qc->id = id;
1886         else
1887                 qc->id = ctrl->id;
1888         strlcpy(qc->name, ctrl->name, sizeof(qc->name));
1889         qc->minimum = ctrl->minimum;
1890         qc->maximum = ctrl->maximum;
1891         qc->default_value = ctrl->default_value;
1892         if (ctrl->type == V4L2_CTRL_TYPE_MENU
1893             || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1894                 qc->step = 1;
1895         else
1896                 qc->step = ctrl->step;
1897         qc->flags = ctrl->flags;
1898         qc->type = ctrl->type;
1899         return 0;
1900 }
1901 EXPORT_SYMBOL(v4l2_queryctrl);
1902
1903 int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
1904 {
1905         if (qc->id & V4L2_CTRL_FLAG_NEXT_CTRL)
1906                 return -EINVAL;
1907         return v4l2_queryctrl(sd->ctrl_handler, qc);
1908 }
1909 EXPORT_SYMBOL(v4l2_subdev_queryctrl);
1910
1911 /* Implement VIDIOC_QUERYMENU */
1912 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
1913 {
1914         struct v4l2_ctrl *ctrl;
1915         u32 i = qm->index;
1916
1917         ctrl = v4l2_ctrl_find(hdl, qm->id);
1918         if (!ctrl)
1919                 return -EINVAL;
1920
1921         qm->reserved = 0;
1922         /* Sanity checks */
1923         switch (ctrl->type) {
1924         case V4L2_CTRL_TYPE_MENU:
1925                 if (ctrl->qmenu == NULL)
1926                         return -EINVAL;
1927                 break;
1928         case V4L2_CTRL_TYPE_INTEGER_MENU:
1929                 if (ctrl->qmenu_int == NULL)
1930                         return -EINVAL;
1931                 break;
1932         default:
1933                 return -EINVAL;
1934         }
1935
1936         if (i < ctrl->minimum || i > ctrl->maximum)
1937                 return -EINVAL;
1938
1939         /* Use mask to see if this menu item should be skipped */
1940         if (ctrl->menu_skip_mask & (1 << i))
1941                 return -EINVAL;
1942         /* Empty menu items should also be skipped */
1943         if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
1944                 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
1945                         return -EINVAL;
1946                 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
1947         } else {
1948                 qm->value = ctrl->qmenu_int[i];
1949         }
1950         return 0;
1951 }
1952 EXPORT_SYMBOL(v4l2_querymenu);
1953
1954 int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
1955 {
1956         return v4l2_querymenu(sd->ctrl_handler, qm);
1957 }
1958 EXPORT_SYMBOL(v4l2_subdev_querymenu);
1959
1960
1961
1962 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
1963
1964    It is not a fully atomic operation, just best-effort only. After all, if
1965    multiple controls have to be set through multiple i2c writes (for example)
1966    then some initial writes may succeed while others fail. Thus leaving the
1967    system in an inconsistent state. The question is how much effort you are
1968    willing to spend on trying to make something atomic that really isn't.
1969
1970    From the point of view of an application the main requirement is that
1971    when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
1972    error should be returned without actually affecting any controls.
1973
1974    If all the values are correct, then it is acceptable to just give up
1975    in case of low-level errors.
1976
1977    It is important though that the application can tell when only a partial
1978    configuration was done. The way we do that is through the error_idx field
1979    of struct v4l2_ext_controls: if that is equal to the count field then no
1980    controls were affected. Otherwise all controls before that index were
1981    successful in performing their 'get' or 'set' operation, the control at
1982    the given index failed, and you don't know what happened with the controls
1983    after the failed one. Since if they were part of a control cluster they
1984    could have been successfully processed (if a cluster member was encountered
1985    at index < error_idx), they could have failed (if a cluster member was at
1986    error_idx), or they may not have been processed yet (if the first cluster
1987    member appeared after error_idx).
1988
1989    It is all fairly theoretical, though. In practice all you can do is to
1990    bail out. If error_idx == count, then it is an application bug. If
1991    error_idx < count then it is only an application bug if the error code was
1992    EBUSY. That usually means that something started streaming just when you
1993    tried to set the controls. In all other cases it is a driver/hardware
1994    problem and all you can do is to retry or bail out.
1995
1996    Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
1997    never modifies controls the error_idx is just set to whatever control
1998    has an invalid value.
1999  */
2000
2001 /* Prepare for the extended g/s/try functions.
2002    Find the controls in the control array and do some basic checks. */
2003 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
2004                              struct v4l2_ext_controls *cs,
2005                              struct v4l2_ctrl_helper *helpers)
2006 {
2007         struct v4l2_ctrl_helper *h;
2008         bool have_clusters = false;
2009         u32 i;
2010
2011         for (i = 0, h = helpers; i < cs->count; i++, h++) {
2012                 struct v4l2_ext_control *c = &cs->controls[i];
2013                 struct v4l2_ctrl_ref *ref;
2014                 struct v4l2_ctrl *ctrl;
2015                 u32 id = c->id & V4L2_CTRL_ID_MASK;
2016
2017                 cs->error_idx = i;
2018
2019                 if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
2020                         return -EINVAL;
2021
2022                 /* Old-style private controls are not allowed for
2023                    extended controls */
2024                 if (id >= V4L2_CID_PRIVATE_BASE)
2025                         return -EINVAL;
2026                 ref = find_ref_lock(hdl, id);
2027                 if (ref == NULL)
2028                         return -EINVAL;
2029                 ctrl = ref->ctrl;
2030                 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
2031                         return -EINVAL;
2032
2033                 if (ctrl->cluster[0]->ncontrols > 1)
2034                         have_clusters = true;
2035                 if (ctrl->cluster[0] != ctrl)
2036                         ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
2037                 /* Store the ref to the master control of the cluster */
2038                 h->mref = ref;
2039                 h->ctrl = ctrl;
2040                 /* Initially set next to 0, meaning that there is no other
2041                    control in this helper array belonging to the same
2042                    cluster */
2043                 h->next = 0;
2044         }
2045
2046         /* We are done if there were no controls that belong to a multi-
2047            control cluster. */
2048         if (!have_clusters)
2049                 return 0;
2050
2051         /* The code below figures out in O(n) time which controls in the list
2052            belong to the same cluster. */
2053
2054         /* This has to be done with the handler lock taken. */
2055         mutex_lock(hdl->lock);
2056
2057         /* First zero the helper field in the master control references */
2058         for (i = 0; i < cs->count; i++)
2059                 helpers[i].mref->helper = 0;
2060         for (i = 0, h = helpers; i < cs->count; i++, h++) {
2061                 struct v4l2_ctrl_ref *mref = h->mref;
2062
2063                 /* If the mref->helper is set, then it points to an earlier
2064                    helper that belongs to the same cluster. */
2065                 if (mref->helper) {
2066                         /* Set the next field of mref->helper to the current
2067                            index: this means that that earlier helper now
2068                            points to the next helper in the same cluster. */
2069                         mref->helper->next = i;
2070                         /* mref should be set only for the first helper in the
2071                            cluster, clear the others. */
2072                         h->mref = NULL;
2073                 }
2074                 /* Point the mref helper to the current helper struct. */
2075                 mref->helper = h;
2076         }
2077         mutex_unlock(hdl->lock);
2078         return 0;
2079 }
2080
2081 /* Handles the corner case where cs->count == 0. It checks whether the
2082    specified control class exists. If that class ID is 0, then it checks
2083    whether there are any controls at all. */
2084 static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class)
2085 {
2086         if (ctrl_class == 0)
2087                 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
2088         return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL;
2089 }
2090
2091
2092
2093 /* Get extended controls. Allocates the helpers array if needed. */
2094 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2095 {
2096         struct v4l2_ctrl_helper helper[4];
2097         struct v4l2_ctrl_helper *helpers = helper;
2098         int ret;
2099         int i, j;
2100
2101         cs->error_idx = cs->count;
2102         cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2103
2104         if (hdl == NULL)
2105                 return -EINVAL;
2106
2107         if (cs->count == 0)
2108                 return class_check(hdl, cs->ctrl_class);
2109
2110         if (cs->count > ARRAY_SIZE(helper)) {
2111                 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2112                                         GFP_KERNEL);
2113                 if (helpers == NULL)
2114                         return -ENOMEM;
2115         }
2116
2117         ret = prepare_ext_ctrls(hdl, cs, helpers);
2118         cs->error_idx = cs->count;
2119
2120         for (i = 0; !ret && i < cs->count; i++)
2121                 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2122                         ret = -EACCES;
2123
2124         for (i = 0; !ret && i < cs->count; i++) {
2125                 int (*ctrl_to_user)(struct v4l2_ext_control *c,
2126                                     struct v4l2_ctrl *ctrl) = cur_to_user;
2127                 struct v4l2_ctrl *master;
2128
2129                 if (helpers[i].mref == NULL)
2130                         continue;
2131
2132                 master = helpers[i].mref->ctrl;
2133                 cs->error_idx = i;
2134
2135                 v4l2_ctrl_lock(master);
2136
2137                 /* g_volatile_ctrl will update the new control values */
2138                 if ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
2139                         (master->has_volatiles && !is_cur_manual(master))) {
2140                         for (j = 0; j < master->ncontrols; j++)
2141                                 cur_to_new(master->cluster[j]);
2142                         ret = call_op(master, g_volatile_ctrl);
2143                         ctrl_to_user = new_to_user;
2144                 }
2145                 /* If OK, then copy the current (for non-volatile controls)
2146                    or the new (for volatile controls) control values to the
2147                    caller */
2148                 if (!ret) {
2149                         u32 idx = i;
2150
2151                         do {
2152                                 ret = ctrl_to_user(cs->controls + idx,
2153                                                    helpers[idx].ctrl);
2154                                 idx = helpers[idx].next;
2155                         } while (!ret && idx);
2156                 }
2157                 v4l2_ctrl_unlock(master);
2158         }
2159
2160         if (cs->count > ARRAY_SIZE(helper))
2161                 kfree(helpers);
2162         return ret;
2163 }
2164 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2165
2166 int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2167 {
2168         return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
2169 }
2170 EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
2171
2172 /* Helper function to get a single control */
2173 static int get_ctrl(struct v4l2_ctrl *ctrl, s32 *val)
2174 {
2175         struct v4l2_ctrl *master = ctrl->cluster[0];
2176         int ret = 0;
2177         int i;
2178
2179         if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2180                 return -EACCES;
2181
2182         v4l2_ctrl_lock(master);
2183         /* g_volatile_ctrl will update the current control values */
2184         if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2185                 for (i = 0; i < master->ncontrols; i++)
2186                         cur_to_new(master->cluster[i]);
2187                 ret = call_op(master, g_volatile_ctrl);
2188                 *val = ctrl->val;
2189         } else {
2190                 *val = ctrl->cur.val;
2191         }
2192         v4l2_ctrl_unlock(master);
2193         return ret;
2194 }
2195
2196 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2197 {
2198         struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2199
2200         if (ctrl == NULL || !type_is_int(ctrl))
2201                 return -EINVAL;
2202         return get_ctrl(ctrl, &control->value);
2203 }
2204 EXPORT_SYMBOL(v4l2_g_ctrl);
2205
2206 int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2207 {
2208         return v4l2_g_ctrl(sd->ctrl_handler, control);
2209 }
2210 EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
2211
2212 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2213 {
2214         s32 val = 0;
2215
2216         /* It's a driver bug if this happens. */
2217         WARN_ON(!type_is_int(ctrl));
2218         get_ctrl(ctrl, &val);
2219         return val;
2220 }
2221 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2222
2223
2224 /* Core function that calls try/s_ctrl and ensures that the new value is
2225    copied to the current value on a set.
2226    Must be called with ctrl->handler->lock held. */
2227 static int try_or_set_cluster(struct v4l2_fh *fh,
2228                               struct v4l2_ctrl *master, bool set)
2229 {
2230         bool update_flag;
2231         int ret;
2232         int i;
2233
2234         /* Go through the cluster and either validate the new value or
2235            (if no new value was set), copy the current value to the new
2236            value, ensuring a consistent view for the control ops when
2237            called. */
2238         for (i = 0; i < master->ncontrols; i++) {
2239                 struct v4l2_ctrl *ctrl = master->cluster[i];
2240
2241                 if (ctrl == NULL)
2242                         continue;
2243
2244                 if (!ctrl->is_new) {
2245                         cur_to_new(ctrl);
2246                         continue;
2247                 }
2248                 /* Check again: it may have changed since the
2249                    previous check in try_or_set_ext_ctrls(). */
2250                 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2251                         return -EBUSY;
2252         }
2253
2254         ret = call_op(master, try_ctrl);
2255
2256         /* Don't set if there is no change */
2257         if (ret || !set || !cluster_changed(master))
2258                 return ret;
2259         ret = call_op(master, s_ctrl);
2260         if (ret)
2261                 return ret;
2262
2263         /* If OK, then make the new values permanent. */
2264         update_flag = is_cur_manual(master) != is_new_manual(master);
2265         for (i = 0; i < master->ncontrols; i++)
2266                 new_to_cur(fh, master->cluster[i], update_flag && i > 0);
2267         return 0;
2268 }
2269
2270 /* Validate controls. */
2271 static int validate_ctrls(struct v4l2_ext_controls *cs,
2272                           struct v4l2_ctrl_helper *helpers, bool set)
2273 {
2274         unsigned i;
2275         int ret = 0;
2276
2277         cs->error_idx = cs->count;
2278         for (i = 0; i < cs->count; i++) {
2279                 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
2280
2281                 cs->error_idx = i;
2282
2283                 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2284                         return -EACCES;
2285                 /* This test is also done in try_set_control_cluster() which
2286                    is called in atomic context, so that has the final say,
2287                    but it makes sense to do an up-front check as well. Once
2288                    an error occurs in try_set_control_cluster() some other
2289                    controls may have been set already and we want to do a
2290                    best-effort to avoid that. */
2291                 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2292                         return -EBUSY;
2293                 ret = validate_new(ctrl, &cs->controls[i]);
2294                 if (ret)
2295                         return ret;
2296         }
2297         return 0;
2298 }
2299
2300 /* Obtain the current volatile values of an autocluster and mark them
2301    as new. */
2302 static void update_from_auto_cluster(struct v4l2_ctrl *master)
2303 {
2304         int i;
2305
2306         for (i = 0; i < master->ncontrols; i++)
2307                 cur_to_new(master->cluster[i]);
2308         if (!call_op(master, g_volatile_ctrl))
2309                 for (i = 1; i < master->ncontrols; i++)
2310                         if (master->cluster[i])
2311                                 master->cluster[i]->is_new = 1;
2312 }
2313
2314 /* Try or try-and-set controls */
2315 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2316                              struct v4l2_ext_controls *cs,
2317                              bool set)
2318 {
2319         struct v4l2_ctrl_helper helper[4];
2320         struct v4l2_ctrl_helper *helpers = helper;
2321         unsigned i, j;
2322         int ret;
2323
2324         cs->error_idx = cs->count;
2325         cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2326
2327         if (hdl == NULL)
2328                 return -EINVAL;
2329
2330         if (cs->count == 0)
2331                 return class_check(hdl, cs->ctrl_class);
2332
2333         if (cs->count > ARRAY_SIZE(helper)) {
2334                 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2335                                         GFP_KERNEL);
2336                 if (!helpers)
2337                         return -ENOMEM;
2338         }
2339         ret = prepare_ext_ctrls(hdl, cs, helpers);
2340         if (!ret)
2341                 ret = validate_ctrls(cs, helpers, set);
2342         if (ret && set)
2343                 cs->error_idx = cs->count;
2344         for (i = 0; !ret && i < cs->count; i++) {
2345                 struct v4l2_ctrl *master;
2346                 u32 idx = i;
2347
2348                 if (helpers[i].mref == NULL)
2349                         continue;
2350
2351                 cs->error_idx = i;
2352                 master = helpers[i].mref->ctrl;
2353                 v4l2_ctrl_lock(master);
2354
2355                 /* Reset the 'is_new' flags of the cluster */
2356                 for (j = 0; j < master->ncontrols; j++)
2357                         if (master->cluster[j])
2358                                 master->cluster[j]->is_new = 0;
2359
2360                 /* For volatile autoclusters that are currently in auto mode
2361                    we need to discover if it will be set to manual mode.
2362                    If so, then we have to copy the current volatile values
2363                    first since those will become the new manual values (which
2364                    may be overwritten by explicit new values from this set
2365                    of controls). */
2366                 if (master->is_auto && master->has_volatiles &&
2367                                                 !is_cur_manual(master)) {
2368                         /* Pick an initial non-manual value */
2369                         s32 new_auto_val = master->manual_mode_value + 1;
2370                         u32 tmp_idx = idx;
2371
2372                         do {
2373                                 /* Check if the auto control is part of the
2374                                    list, and remember the new value. */
2375                                 if (helpers[tmp_idx].ctrl == master)
2376                                         new_auto_val = cs->controls[tmp_idx].value;
2377                                 tmp_idx = helpers[tmp_idx].next;
2378                         } while (tmp_idx);
2379                         /* If the new value == the manual value, then copy
2380                            the current volatile values. */
2381                         if (new_auto_val == master->manual_mode_value)
2382                                 update_from_auto_cluster(master);
2383                 }
2384
2385                 /* Copy the new caller-supplied control values.
2386                    user_to_new() sets 'is_new' to 1. */
2387                 do {
2388                         ret = user_to_new(cs->controls + idx, helpers[idx].ctrl);
2389                         idx = helpers[idx].next;
2390                 } while (!ret && idx);
2391
2392                 if (!ret)
2393                         ret = try_or_set_cluster(fh, master, set);
2394
2395                 /* Copy the new values back to userspace. */
2396                 if (!ret) {
2397                         idx = i;
2398                         do {
2399                                 ret = new_to_user(cs->controls + idx,
2400                                                 helpers[idx].ctrl);
2401                                 idx = helpers[idx].next;
2402                         } while (!ret && idx);
2403                 }
2404                 v4l2_ctrl_unlock(master);
2405         }
2406
2407         if (cs->count > ARRAY_SIZE(helper))
2408                 kfree(helpers);
2409         return ret;
2410 }
2411
2412 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2413 {
2414         return try_set_ext_ctrls(NULL, hdl, cs, false);
2415 }
2416 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
2417
2418 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2419                                         struct v4l2_ext_controls *cs)
2420 {
2421         return try_set_ext_ctrls(fh, hdl, cs, true);
2422 }
2423 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
2424
2425 int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2426 {
2427         return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, false);
2428 }
2429 EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
2430
2431 int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2432 {
2433         return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, true);
2434 }
2435 EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
2436
2437 /* Helper function for VIDIOC_S_CTRL compatibility */
2438 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, s32 *val)
2439 {
2440         struct v4l2_ctrl *master = ctrl->cluster[0];
2441         int ret;
2442         int i;
2443
2444         ret = validate_new_int(ctrl, val);
2445         if (ret)
2446                 return ret;
2447
2448         v4l2_ctrl_lock(ctrl);
2449
2450         /* Reset the 'is_new' flags of the cluster */
2451         for (i = 0; i < master->ncontrols; i++)
2452                 if (master->cluster[i])
2453                         master->cluster[i]->is_new = 0;
2454
2455         /* For autoclusters with volatiles that are switched from auto to
2456            manual mode we have to update the current volatile values since
2457            those will become the initial manual values after such a switch. */
2458         if (master->is_auto && master->has_volatiles && ctrl == master &&
2459             !is_cur_manual(master) && *val == master->manual_mode_value)
2460                 update_from_auto_cluster(master);
2461         ctrl->val = *val;
2462         ctrl->is_new = 1;
2463         ret = try_or_set_cluster(fh, master, true);
2464         *val = ctrl->cur.val;
2465         v4l2_ctrl_unlock(ctrl);
2466         return ret;
2467 }
2468
2469 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2470                                         struct v4l2_control *control)
2471 {
2472         struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2473
2474         if (ctrl == NULL || !type_is_int(ctrl))
2475                 return -EINVAL;
2476
2477         if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2478                 return -EACCES;
2479
2480         return set_ctrl(fh, ctrl, &control->value);
2481 }
2482 EXPORT_SYMBOL(v4l2_s_ctrl);
2483
2484 int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2485 {
2486         return v4l2_s_ctrl(NULL, sd->ctrl_handler, control);
2487 }
2488 EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
2489
2490 int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
2491 {
2492         /* It's a driver bug if this happens. */
2493         WARN_ON(!type_is_int(ctrl));
2494         return set_ctrl(NULL, ctrl, &val);
2495 }
2496 EXPORT_SYMBOL(v4l2_ctrl_s_ctrl);
2497
2498 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev)
2499 {
2500         struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
2501
2502         if (ctrl == NULL)
2503                 return -EINVAL;
2504
2505         v4l2_ctrl_lock(ctrl);
2506         list_add_tail(&sev->node, &ctrl->ev_subs);
2507         if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
2508             (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
2509                 struct v4l2_event ev;
2510                 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
2511
2512                 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
2513                         changes |= V4L2_EVENT_CTRL_CH_VALUE;
2514                 fill_event(&ev, ctrl, changes);
2515                 v4l2_event_queue_fh(sev->fh, &ev);
2516         }
2517         v4l2_ctrl_unlock(ctrl);
2518         return 0;
2519 }
2520
2521 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
2522 {
2523         struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
2524
2525         v4l2_ctrl_lock(ctrl);
2526         list_del(&sev->node);
2527         v4l2_ctrl_unlock(ctrl);
2528 }
2529
2530 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
2531 {
2532         u32 old_changes = old->u.ctrl.changes;
2533
2534         old->u.ctrl = new->u.ctrl;
2535         old->u.ctrl.changes |= old_changes;
2536 }
2537 EXPORT_SYMBOL(v4l2_ctrl_replace);
2538
2539 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
2540 {
2541         new->u.ctrl.changes |= old->u.ctrl.changes;
2542 }
2543 EXPORT_SYMBOL(v4l2_ctrl_merge);
2544
2545 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
2546         .add = v4l2_ctrl_add_event,
2547         .del = v4l2_ctrl_del_event,
2548         .replace = v4l2_ctrl_replace,
2549         .merge = v4l2_ctrl_merge,
2550 };
2551 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
2552
2553 int v4l2_ctrl_log_status(struct file *file, void *fh)
2554 {
2555         struct video_device *vfd = video_devdata(file);
2556         struct v4l2_fh *vfh = file->private_data;
2557
2558         if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
2559                 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
2560                         vfd->v4l2_dev->name);
2561         return 0;
2562 }
2563 EXPORT_SYMBOL(v4l2_ctrl_log_status);
2564
2565 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
2566                                 struct v4l2_event_subscription *sub)
2567 {
2568         if (sub->type == V4L2_EVENT_CTRL)
2569                 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
2570         return -EINVAL;
2571 }
2572 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
2573
2574 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
2575 {
2576         struct v4l2_fh *fh = file->private_data;
2577
2578         if (v4l2_event_pending(fh))
2579                 return POLLPRI;
2580         poll_wait(file, &fh->wait, wait);
2581         return 0;
2582 }
2583 EXPORT_SYMBOL(v4l2_ctrl_poll);