drivers/media/v4l2-core/v4l2-ctrls.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3     V4L2 controls framework implementation.
   4
   5     Copyright (C) 2010  Hans Verkuil <hverkuil@xs4all.nl>
   6
   7  */
   8
   9 #include <linux/ctype.h>
  10 #include <linux/mm.h>
  11 #include <linux/slab.h>
  12 #include <linux/export.h>
  13 #include <media/v4l2-ioctl.h>
  14 #include <media/v4l2-device.h>
  15 #include <media/v4l2-ctrls.h>
  16 #include <media/v4l2-event.h>
  17 #include <media/v4l2-dev.h>
  18
  19 #define has_op(master, op) \
  20         (master->ops && master->ops->op)
  21 #define call_op(master, op) \
  22         (has_op(master, op) ? master->ops->op(master) : 0)
  23
  24 /* Internal temporary helper struct, one for each v4l2_ext_control */
  25 struct v4l2_ctrl_helper {
  26         /* Pointer to the control reference of the master control */
  27         struct v4l2_ctrl_ref *mref;
  28         /* The control ref corresponding to the v4l2_ext_control ID field. */
  29         struct v4l2_ctrl_ref *ref;
  30         /* v4l2_ext_control index of the next control belonging to the
  31            same cluster, or 0 if there isn't any. */
  32         u32 next;
  33 };
  34
  35 /* Small helper function to determine if the autocluster is set to manual
  36    mode. */
  37 static bool is_cur_manual(const struct v4l2_ctrl *master)
  38 {
  39         return master->is_auto && master->cur.val == master->manual_mode_value;
  40 }
  41
  42 /* Same as above, but this checks the against the new value instead of the
  43    current value. */
  44 static bool is_new_manual(const struct v4l2_ctrl *master)
  45 {
  46         return master->is_auto && master->val == master->manual_mode_value;
  47 }
  48
  49 /* Returns NULL or a character pointer array containing the menu for
  50    the given control ID. The pointer array ends with a NULL pointer.
  51    An empty string signifies a menu entry that is invalid. This allows
  52    drivers to disable certain options if it is not supported. */
  53 const char * const *v4l2_ctrl_get_menu(u32 id)
  54 {
  55         static const char * const mpeg_audio_sampling_freq[] = {
  56                 "44.1 kHz",
  57                 "48 kHz",
  58                 "32 kHz",
  59                 NULL
  60         };
  61         static const char * const mpeg_audio_encoding[] = {
  62                 "MPEG-1/2 Layer I",
  63                 "MPEG-1/2 Layer II",
  64                 "MPEG-1/2 Layer III",
  65                 "MPEG-2/4 AAC",
  66                 "AC-3",
  67                 NULL
  68         };
  69         static const char * const mpeg_audio_l1_bitrate[] = {
  70                 "32 kbps",
  71                 "64 kbps",
  72                 "96 kbps",
  73                 "128 kbps",
  74                 "160 kbps",
  75                 "192 kbps",
  76                 "224 kbps",
  77                 "256 kbps",
  78                 "288 kbps",
  79                 "320 kbps",
  80                 "352 kbps",
  81                 "384 kbps",
  82                 "416 kbps",
  83                 "448 kbps",
  84                 NULL
  85         };
  86         static const char * const mpeg_audio_l2_bitrate[] = {
  87                 "32 kbps",
  88                 "48 kbps",
  89                 "56 kbps",
  90                 "64 kbps",
  91                 "80 kbps",
  92                 "96 kbps",
  93                 "112 kbps",
  94                 "128 kbps",
  95                 "160 kbps",
  96                 "192 kbps",
  97                 "224 kbps",
  98                 "256 kbps",
  99                 "320 kbps",
 100                 "384 kbps",
 101                 NULL
 102         };
 103         static const char * const mpeg_audio_l3_bitrate[] = {
 104                 "32 kbps",
 105                 "40 kbps",
 106                 "48 kbps",
 107                 "56 kbps",
 108                 "64 kbps",
 109                 "80 kbps",
 110                 "96 kbps",
 111                 "112 kbps",
 112                 "128 kbps",
 113                 "160 kbps",
 114                 "192 kbps",
 115                 "224 kbps",
 116                 "256 kbps",
 117                 "320 kbps",
 118                 NULL
 119         };
 120         static const char * const mpeg_audio_ac3_bitrate[] = {
 121                 "32 kbps",
 122                 "40 kbps",
 123                 "48 kbps",
 124                 "56 kbps",
 125                 "64 kbps",
 126                 "80 kbps",
 127                 "96 kbps",
 128                 "112 kbps",
 129                 "128 kbps",
 130                 "160 kbps",
 131                 "192 kbps",
 132                 "224 kbps",
 133                 "256 kbps",
 134                 "320 kbps",
 135                 "384 kbps",
 136                 "448 kbps",
 137                 "512 kbps",
 138                 "576 kbps",
 139                 "640 kbps",
 140                 NULL
 141         };
 142         static const char * const mpeg_audio_mode[] = {
 143                 "Stereo",
 144                 "Joint Stereo",
 145                 "Dual",
 146                 "Mono",
 147                 NULL
 148         };
 149         static const char * const mpeg_audio_mode_extension[] = {
 150                 "Bound 4",
 151                 "Bound 8",
 152                 "Bound 12",
 153                 "Bound 16",
 154                 NULL
 155         };
 156         static const char * const mpeg_audio_emphasis[] = {
 157                 "No Emphasis",
 158                 "50/15 us",
 159                 "CCITT J17",
 160                 NULL
 161         };
 162         static const char * const mpeg_audio_crc[] = {
 163                 "No CRC",
 164                 "16-bit CRC",
 165                 NULL
 166         };
 167         static const char * const mpeg_audio_dec_playback[] = {
 168                 "Auto",
 169                 "Stereo",
 170                 "Left",
 171                 "Right",
 172                 "Mono",
 173                 "Swapped Stereo",
 174                 NULL
 175         };
 176         static const char * const mpeg_video_encoding[] = {
 177                 "MPEG-1",
 178                 "MPEG-2",
 179                 "MPEG-4 AVC",
 180                 NULL
 181         };
 182         static const char * const mpeg_video_aspect[] = {
 183                 "1x1",
 184                 "4x3",
 185                 "16x9",
 186                 "2.21x1",
 187                 NULL
 188         };
 189         static const char * const mpeg_video_bitrate_mode[] = {
 190                 "Variable Bitrate",
 191                 "Constant Bitrate",
 192                 NULL
 193         };
 194         static const char * const mpeg_stream_type[] = {
 195                 "MPEG-2 Program Stream",
 196                 "MPEG-2 Transport Stream",
 197                 "MPEG-1 System Stream",
 198                 "MPEG-2 DVD-compatible Stream",
 199                 "MPEG-1 VCD-compatible Stream",
 200                 "MPEG-2 SVCD-compatible Stream",
 201                 NULL
 202         };
 203         static const char * const mpeg_stream_vbi_fmt[] = {
 204                 "No VBI",
 205                 "Private Packet, IVTV Format",
 206                 NULL
 207         };
 208         static const char * const camera_power_line_frequency[] = {
 209                 "Disabled",
 210                 "50 Hz",
 211                 "60 Hz",
 212                 "Auto",
 213                 NULL
 214         };
 215         static const char * const camera_exposure_auto[] = {
 216                 "Auto Mode",
 217                 "Manual Mode",
 218                 "Shutter Priority Mode",
 219                 "Aperture Priority Mode",
 220                 NULL
 221         };
 222         static const char * const camera_exposure_metering[] = {
 223                 "Average",
 224                 "Center Weighted",
 225                 "Spot",
 226                 "Matrix",
 227                 NULL
 228         };
 229         static const char * const camera_auto_focus_range[] = {
 230                 "Auto",
 231                 "Normal",
 232                 "Macro",
 233                 "Infinity",
 234                 NULL
 235         };
 236         static const char * const colorfx[] = {
 237                 "None",
 238                 "Black & White",
 239                 "Sepia",
 240                 "Negative",
 241                 "Emboss",
 242                 "Sketch",
 243                 "Sky Blue",
 244                 "Grass Green",
 245                 "Skin Whiten",
 246                 "Vivid",
 247                 "Aqua",
 248                 "Art Freeze",
 249                 "Silhouette",
 250                 "Solarization",
 251                 "Antique",
 252                 "Set Cb/Cr",
 253                 NULL
 254         };
 255         static const char * const auto_n_preset_white_balance[] = {
 256                 "Manual",
 257                 "Auto",
 258                 "Incandescent",
 259                 "Fluorescent",
 260                 "Fluorescent H",
 261                 "Horizon",
 262                 "Daylight",
 263                 "Flash",
 264                 "Cloudy",
 265                 "Shade",
 266                 NULL,
 267         };
 268         static const char * const camera_iso_sensitivity_auto[] = {
 269                 "Manual",
 270                 "Auto",
 271                 NULL
 272         };
 273         static const char * const scene_mode[] = {
 274                 "None",
 275                 "Backlight",
 276                 "Beach/Snow",
 277                 "Candle Light",
 278                 "Dusk/Dawn",
 279                 "Fall Colors",
 280                 "Fireworks",
 281                 "Landscape",
 282                 "Night",
 283                 "Party/Indoor",
 284                 "Portrait",
 285                 "Sports",
 286                 "Sunset",
 287                 "Text",
 288                 NULL
 289         };
 290         static const char * const tune_emphasis[] = {
 291                 "None",
 292                 "50 Microseconds",
 293                 "75 Microseconds",
 294                 NULL,
 295         };
 296         static const char * const header_mode[] = {
 297                 "Separate Buffer",
 298                 "Joined With 1st Frame",
 299                 NULL,
 300         };
 301         static const char * const multi_slice[] = {
 302                 "Single",
 303                 "Max Macroblocks",
 304                 "Max Bytes",
 305                 NULL,
 306         };
 307         static const char * const entropy_mode[] = {
 308                 "CAVLC",
 309                 "CABAC",
 310                 NULL,
 311         };
 312         static const char * const mpeg_h264_level[] = {
 313                 "1",
 314                 "1b",
 315                 "1.1",
 316                 "1.2",
 317                 "1.3",
 318                 "2",
 319                 "2.1",
 320                 "2.2",
 321                 "3",
 322                 "3.1",
 323                 "3.2",
 324                 "4",
 325                 "4.1",
 326                 "4.2",
 327                 "5",
 328                 "5.1",
 329                 NULL,
 330         };
 331         static const char * const h264_loop_filter[] = {
 332                 "Enabled",
 333                 "Disabled",
 334                 "Disabled at Slice Boundary",
 335                 NULL,
 336         };
 337         static const char * const h264_profile[] = {
 338                 "Baseline",
 339                 "Constrained Baseline",
 340                 "Main",
 341                 "Extended",
 342                 "High",
 343                 "High 10",
 344                 "High 422",
 345                 "High 444 Predictive",
 346                 "High 10 Intra",
 347                 "High 422 Intra",
 348                 "High 444 Intra",
 349                 "CAVLC 444 Intra",
 350                 "Scalable Baseline",
 351                 "Scalable High",
 352                 "Scalable High Intra",
 353                 "Stereo High",
 354                 "Multiview High",
 355                 NULL,
 356         };
 357         static const char * const vui_sar_idc[] = {
 358                 "Unspecified",
 359                 "1:1",
 360                 "12:11",
 361                 "10:11",
 362                 "16:11",
 363                 "40:33",
 364                 "24:11",
 365                 "20:11",
 366                 "32:11",
 367                 "80:33",
 368                 "18:11",
 369                 "15:11",
 370                 "64:33",
 371                 "160:99",
 372                 "4:3",
 373                 "3:2",
 374                 "2:1",
 375                 "Extended SAR",
 376                 NULL,
 377         };
 378         static const char * const h264_fp_arrangement_type[] = {
 379                 "Checkerboard",
 380                 "Column",
 381                 "Row",
 382                 "Side by Side",
 383                 "Top Bottom",
 384                 "Temporal",
 385                 NULL,
 386         };
 387         static const char * const h264_fmo_map_type[] = {
 388                 "Interleaved Slices",
 389                 "Scattered Slices",
 390                 "Foreground with Leftover",
 391                 "Box Out",
 392                 "Raster Scan",
 393                 "Wipe Scan",
 394                 "Explicit",
 395                 NULL,
 396         };
 397         static const char * const mpeg_mpeg4_level[] = {
 398                 "0",
 399                 "0b",
 400                 "1",
 401                 "2",
 402                 "3",
 403                 "3b",
 404                 "4",
 405                 "5",
 406                 NULL,
 407         };
 408         static const char * const mpeg4_profile[] = {
 409                 "Simple",
 410                 "Advanced Simple",
 411                 "Core",
 412                 "Simple Scalable",
 413                 "Advanced Coding Efficiency",
 414                 NULL,
 415         };
 416
 417         static const char * const vpx_golden_frame_sel[] = {
 418                 "Use Previous Frame",
 419                 "Use Previous Specific Frame",
 420                 NULL,
 421         };
 422         static const char * const vp8_profile[] = {
 423                 "0",
 424                 "1",
 425                 "2",
 426                 "3",
 427                 NULL,
 428         };
 429         static const char * const vp9_profile[] = {
 430                 "0",
 431                 "1",
 432                 "2",
 433                 "3",
 434                 NULL,
 435         };
 436
 437         static const char * const flash_led_mode[] = {
 438                 "Off",
 439                 "Flash",
 440                 "Torch",
 441                 NULL,
 442         };
 443         static const char * const flash_strobe_source[] = {
 444                 "Software",
 445                 "External",
 446                 NULL,
 447         };
 448
 449         static const char * const jpeg_chroma_subsampling[] = {
 450                 "4:4:4",
 451                 "4:2:2",
 452                 "4:2:0",
 453                 "4:1:1",
 454                 "4:1:0",
 455                 "Gray",
 456                 NULL,
 457         };
 458         static const char * const dv_tx_mode[] = {
 459                 "DVI-D",
 460                 "HDMI",
 461                 NULL,
 462         };
 463         static const char * const dv_rgb_range[] = {
 464                 "Automatic",
 465                 "RGB Limited Range (16-235)",
 466                 "RGB Full Range (0-255)",
 467                 NULL,
 468         };
 469         static const char * const dv_it_content_type[] = {
 470                 "Graphics",
 471                 "Photo",
 472                 "Cinema",
 473                 "Game",
 474                 "No IT Content",
 475                 NULL,
 476         };
 477         static const char * const detect_md_mode[] = {
 478                 "Disabled",
 479                 "Global",
 480                 "Threshold Grid",
 481                 "Region Grid",
 482                 NULL,
 483         };
 484
 485         static const char * const hevc_profile[] = {
 486                 "Main",
 487                 "Main Still Picture",
 488                 "Main 10",
 489                 NULL,
 490         };
 491         static const char * const hevc_level[] = {
 492                 "1",
 493                 "2",
 494                 "2.1",
 495                 "3",
 496                 "3.1",
 497                 "4",
 498                 "4.1",
 499                 "5",
 500                 "5.1",
 501                 "5.2",
 502                 "6",
 503                 "6.1",
 504                 "6.2",
 505                 NULL,
 506         };
 507         static const char * const hevc_hierarchial_coding_type[] = {
 508                 "B",
 509                 "P",
 510                 NULL,
 511         };
 512         static const char * const hevc_refresh_type[] = {
 513                 "None",
 514                 "CRA",
 515                 "IDR",
 516                 NULL,
 517         };
 518         static const char * const hevc_size_of_length_field[] = {
 519                 "0",
 520                 "1",
 521                 "2",
 522                 "4",
 523                 NULL,
 524         };
 525         static const char * const hevc_tier[] = {
 526                 "Main",
 527                 "High",
 528                 NULL,
 529         };
 530         static const char * const hevc_loop_filter_mode[] = {
 531                 "Disabled",
 532                 "Enabled",
 533                 "Disabled at slice boundary",
 534                 "NULL",
 535         };
 536
 537         switch (id) {
 538         case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
 539                 return mpeg_audio_sampling_freq;
 540         case V4L2_CID_MPEG_AUDIO_ENCODING:
 541                 return mpeg_audio_encoding;
 542         case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
 543                 return mpeg_audio_l1_bitrate;
 544         case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
 545                 return mpeg_audio_l2_bitrate;
 546         case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
 547                 return mpeg_audio_l3_bitrate;
 548         case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
 549                 return mpeg_audio_ac3_bitrate;
 550         case V4L2_CID_MPEG_AUDIO_MODE:
 551                 return mpeg_audio_mode;
 552         case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
 553                 return mpeg_audio_mode_extension;
 554         case V4L2_CID_MPEG_AUDIO_EMPHASIS:
 555                 return mpeg_audio_emphasis;
 556         case V4L2_CID_MPEG_AUDIO_CRC:
 557                 return mpeg_audio_crc;
 558         case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
 559         case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
 560                 return mpeg_audio_dec_playback;
 561         case V4L2_CID_MPEG_VIDEO_ENCODING:
 562                 return mpeg_video_encoding;
 563         case V4L2_CID_MPEG_VIDEO_ASPECT:
 564                 return mpeg_video_aspect;
 565         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
 566                 return mpeg_video_bitrate_mode;
 567         case V4L2_CID_MPEG_STREAM_TYPE:
 568                 return mpeg_stream_type;
 569         case V4L2_CID_MPEG_STREAM_VBI_FMT:
 570                 return mpeg_stream_vbi_fmt;
 571         case V4L2_CID_POWER_LINE_FREQUENCY:
 572                 return camera_power_line_frequency;
 573         case V4L2_CID_EXPOSURE_AUTO:
 574                 return camera_exposure_auto;
 575         case V4L2_CID_EXPOSURE_METERING:
 576                 return camera_exposure_metering;
 577         case V4L2_CID_AUTO_FOCUS_RANGE:
 578                 return camera_auto_focus_range;
 579         case V4L2_CID_COLORFX:
 580                 return colorfx;
 581         case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
 582                 return auto_n_preset_white_balance;
 583         case V4L2_CID_ISO_SENSITIVITY_AUTO:
 584                 return camera_iso_sensitivity_auto;
 585         case V4L2_CID_SCENE_MODE:
 586                 return scene_mode;
 587         case V4L2_CID_TUNE_PREEMPHASIS:
 588                 return tune_emphasis;
 589         case V4L2_CID_TUNE_DEEMPHASIS:
 590                 return tune_emphasis;
 591         case V4L2_CID_FLASH_LED_MODE:
 592                 return flash_led_mode;
 593         case V4L2_CID_FLASH_STROBE_SOURCE:
 594                 return flash_strobe_source;
 595         case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
 596                 return header_mode;
 597         case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
 598                 return multi_slice;
 599         case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
 600                 return entropy_mode;
 601         case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
 602                 return mpeg_h264_level;
 603         case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
 604                 return h264_loop_filter;
 605         case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
 606                 return h264_profile;
 607         case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
 608                 return vui_sar_idc;
 609         case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
 610                 return h264_fp_arrangement_type;
 611         case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
 612                 return h264_fmo_map_type;
 613         case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
 614                 return mpeg_mpeg4_level;
 615         case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
 616                 return mpeg4_profile;
 617         case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
 618                 return vpx_golden_frame_sel;
 619         case V4L2_CID_MPEG_VIDEO_VP8_PROFILE:
 620                 return vp8_profile;
 621         case V4L2_CID_MPEG_VIDEO_VP9_PROFILE:
 622                 return vp9_profile;
 623         case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
 624                 return jpeg_chroma_subsampling;
 625         case V4L2_CID_DV_TX_MODE:
 626                 return dv_tx_mode;
 627         case V4L2_CID_DV_TX_RGB_RANGE:
 628         case V4L2_CID_DV_RX_RGB_RANGE:
 629                 return dv_rgb_range;
 630         case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
 631         case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
 632                 return dv_it_content_type;
 633         case V4L2_CID_DETECT_MD_MODE:
 634                 return detect_md_mode;
 635         case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE:
 636                 return hevc_profile;
 637         case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL:
 638                 return hevc_level;
 639         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE:
 640                 return hevc_hierarchial_coding_type;
 641         case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE:
 642                 return hevc_refresh_type;
 643         case V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD:
 644                 return hevc_size_of_length_field;
 645         case V4L2_CID_MPEG_VIDEO_HEVC_TIER:
 646                 return hevc_tier;
 647         case V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE:
 648                 return hevc_loop_filter_mode;
 649
 650         default:
 651                 return NULL;
 652         }
 653 }
 654 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
 655
 656 #define __v4l2_qmenu_int_len(arr, len) ({ *(len) = ARRAY_SIZE(arr); arr; })
 657 /*
 658  * Returns NULL or an s64 type array containing the menu for given
 659  * control ID. The total number of the menu items is returned in @len.
 660  */
 661 const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len)
 662 {
 663         static const s64 qmenu_int_vpx_num_partitions[] = {
 664                 1, 2, 4, 8,
 665         };
 666
 667         static const s64 qmenu_int_vpx_num_ref_frames[] = {
 668                 1, 2, 3,
 669         };
 670
 671         switch (id) {
 672         case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
 673                 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_partitions, len);
 674         case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
 675                 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_ref_frames, len);
 676         default:
 677                 *len = 0;
 678                 return NULL;
 679         }
 680 }
 681 EXPORT_SYMBOL(v4l2_ctrl_get_int_menu);
 682
 683 /* Return the control name. */
 684 const char *v4l2_ctrl_get_name(u32 id)
 685 {
 686         switch (id) {
 687         /* USER controls */
 688         /* Keep the order of the 'case's the same as in v4l2-controls.h! */
 689         case V4L2_CID_USER_CLASS:               return "User Controls";
 690         case V4L2_CID_BRIGHTNESS:               return "Brightness";
 691         case V4L2_CID_CONTRAST:                 return "Contrast";
 692         case V4L2_CID_SATURATION:               return "Saturation";
 693         case V4L2_CID_HUE:                      return "Hue";
 694         case V4L2_CID_AUDIO_VOLUME:             return "Volume";
 695         case V4L2_CID_AUDIO_BALANCE:            return "Balance";
 696         case V4L2_CID_AUDIO_BASS:               return "Bass";
 697         case V4L2_CID_AUDIO_TREBLE:             return "Treble";
 698         case V4L2_CID_AUDIO_MUTE:               return "Mute";
 699         case V4L2_CID_AUDIO_LOUDNESS:           return "Loudness";
 700         case V4L2_CID_BLACK_LEVEL:              return "Black Level";
 701         case V4L2_CID_AUTO_WHITE_BALANCE:       return "White Balance, Automatic";
 702         case V4L2_CID_DO_WHITE_BALANCE:         return "Do White Balance";
 703         case V4L2_CID_RED_BALANCE:              return "Red Balance";
 704         case V4L2_CID_BLUE_BALANCE:             return "Blue Balance";
 705         case V4L2_CID_GAMMA:                    return "Gamma";
 706         case V4L2_CID_EXPOSURE:                 return "Exposure";
 707         case V4L2_CID_AUTOGAIN:                 return "Gain, Automatic";
 708         case V4L2_CID_GAIN:                     return "Gain";
 709         case V4L2_CID_HFLIP:                    return "Horizontal Flip";
 710         case V4L2_CID_VFLIP:                    return "Vertical Flip";
 711         case V4L2_CID_POWER_LINE_FREQUENCY:     return "Power Line Frequency";
 712         case V4L2_CID_HUE_AUTO:                 return "Hue, Automatic";
 713         case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
 714         case V4L2_CID_SHARPNESS:                return "Sharpness";
 715         case V4L2_CID_BACKLIGHT_COMPENSATION:   return "Backlight Compensation";
 716         case V4L2_CID_CHROMA_AGC:               return "Chroma AGC";
 717         case V4L2_CID_COLOR_KILLER:             return "Color Killer";
 718         case V4L2_CID_COLORFX:                  return "Color Effects";
 719         case V4L2_CID_AUTOBRIGHTNESS:           return "Brightness, Automatic";
 720         case V4L2_CID_BAND_STOP_FILTER:         return "Band-Stop Filter";
 721         case V4L2_CID_ROTATE:                   return "Rotate";
 722         case V4L2_CID_BG_COLOR:                 return "Background Color";
 723         case V4L2_CID_CHROMA_GAIN:              return "Chroma Gain";
 724         case V4L2_CID_ILLUMINATORS_1:           return "Illuminator 1";
 725         case V4L2_CID_ILLUMINATORS_2:           return "Illuminator 2";
 726         case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:  return "Min Number of Capture Buffers";
 727         case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:   return "Min Number of Output Buffers";
 728         case V4L2_CID_ALPHA_COMPONENT:          return "Alpha Component";
 729         case V4L2_CID_COLORFX_CBCR:             return "Color Effects, CbCr";
 730
 731         /* Codec controls */
 732         /* The MPEG controls are applicable to all codec controls
 733          * and the 'MPEG' part of the define is historical */
 734         /* Keep the order of the 'case's the same as in videodev2.h! */
 735         case V4L2_CID_MPEG_CLASS:               return "Codec Controls";
 736         case V4L2_CID_MPEG_STREAM_TYPE:         return "Stream Type";
 737         case V4L2_CID_MPEG_STREAM_PID_PMT:      return "Stream PMT Program ID";
 738         case V4L2_CID_MPEG_STREAM_PID_AUDIO:    return "Stream Audio Program ID";
 739         case V4L2_CID_MPEG_STREAM_PID_VIDEO:    return "Stream Video Program ID";
 740         case V4L2_CID_MPEG_STREAM_PID_PCR:      return "Stream PCR Program ID";
 741         case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
 742         case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
 743         case V4L2_CID_MPEG_STREAM_VBI_FMT:      return "Stream VBI Format";
 744         case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
 745         case V4L2_CID_MPEG_AUDIO_ENCODING:      return "Audio Encoding";
 746         case V4L2_CID_MPEG_AUDIO_L1_BITRATE:    return "Audio Layer I Bitrate";
 747         case V4L2_CID_MPEG_AUDIO_L2_BITRATE:    return "Audio Layer II Bitrate";
 748         case V4L2_CID_MPEG_AUDIO_L3_BITRATE:    return "Audio Layer III Bitrate";
 749         case V4L2_CID_MPEG_AUDIO_MODE:          return "Audio Stereo Mode";
 750         case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
 751         case V4L2_CID_MPEG_AUDIO_EMPHASIS:      return "Audio Emphasis";
 752         case V4L2_CID_MPEG_AUDIO_CRC:           return "Audio CRC";
 753         case V4L2_CID_MPEG_AUDIO_MUTE:          return "Audio Mute";
 754         case V4L2_CID_MPEG_AUDIO_AAC_BITRATE:   return "Audio AAC Bitrate";
 755         case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:   return "Audio AC-3 Bitrate";
 756         case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:  return "Audio Playback";
 757         case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK: return "Audio Multilingual Playback";
 758         case V4L2_CID_MPEG_VIDEO_ENCODING:      return "Video Encoding";
 759         case V4L2_CID_MPEG_VIDEO_ASPECT:        return "Video Aspect";
 760         case V4L2_CID_MPEG_VIDEO_B_FRAMES:      return "Video B Frames";
 761         case V4L2_CID_MPEG_VIDEO_GOP_SIZE:      return "Video GOP Size";
 762         case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:   return "Video GOP Closure";
 763         case V4L2_CID_MPEG_VIDEO_PULLDOWN:      return "Video Pulldown";
 764         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:  return "Video Bitrate Mode";
 765         case V4L2_CID_MPEG_VIDEO_BITRATE:       return "Video Bitrate";
 766         case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK:  return "Video Peak Bitrate";
 767         case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
 768         case V4L2_CID_MPEG_VIDEO_MUTE:          return "Video Mute";
 769         case V4L2_CID_MPEG_VIDEO_MUTE_YUV:      return "Video Mute YUV";
 770         case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:       return "Decoder Slice Interface";
 771         case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:  return "MPEG4 Loop Filter Enable";
 772         case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB:       return "Number of Intra Refresh MBs";
 773         case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:               return "Frame Level Rate Control Enable";
 774         case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:                  return "H264 MB Level Rate Control";
 775         case V4L2_CID_MPEG_VIDEO_HEADER_MODE:                   return "Sequence Header Mode";
 776         case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC:                   return "Max Number of Reference Pics";
 777         case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP:               return "H263 I-Frame QP Value";
 778         case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP:               return "H263 P-Frame QP Value";
 779         case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP:               return "H263 B-Frame QP Value";
 780         case V4L2_CID_MPEG_VIDEO_H263_MIN_QP:                   return "H263 Minimum QP Value";
 781         case V4L2_CID_MPEG_VIDEO_H263_MAX_QP:                   return "H263 Maximum QP Value";
 782         case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP:               return "H264 I-Frame QP Value";
 783         case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP:               return "H264 P-Frame QP Value";
 784         case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP:               return "H264 B-Frame QP Value";
 785         case V4L2_CID_MPEG_VIDEO_H264_MAX_QP:                   return "H264 Maximum QP Value";
 786         case V4L2_CID_MPEG_VIDEO_H264_MIN_QP:                   return "H264 Minimum QP Value";
 787         case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:            return "H264 8x8 Transform Enable";
 788         case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE:                 return "H264 CPB Buffer Size";
 789         case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:             return "H264 Entropy Mode";
 790         case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD:                 return "H264 I-Frame Period";
 791         case V4L2_CID_MPEG_VIDEO_H264_LEVEL:                    return "H264 Level";
 792         case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA:        return "H264 Loop Filter Alpha Offset";
 793         case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA:         return "H264 Loop Filter Beta Offset";
 794         case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:         return "H264 Loop Filter Mode";
 795         case V4L2_CID_MPEG_VIDEO_H264_PROFILE:                  return "H264 Profile";
 796         case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT:       return "Vertical Size of SAR";
 797         case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH:        return "Horizontal Size of SAR";
 798         case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:           return "Aspect Ratio VUI Enable";
 799         case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:              return "VUI Aspect Ratio IDC";
 800         case V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING:        return "H264 Enable Frame Packing SEI";
 801         case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0:   return "H264 Set Curr. Frame as Frame0";
 802         case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:  return "H264 FP Arrangement Type";
 803         case V4L2_CID_MPEG_VIDEO_H264_FMO:                      return "H264 Flexible MB Ordering";
 804         case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:             return "H264 Map Type for FMO";
 805         case V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP:          return "H264 FMO Number of Slice Groups";
 806         case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION:     return "H264 FMO Direction of Change";
 807         case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE:          return "H264 FMO Size of 1st Slice Grp";
 808         case V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH:           return "H264 FMO No. of Consecutive MBs";
 809         case V4L2_CID_MPEG_VIDEO_H264_ASO:                      return "H264 Arbitrary Slice Ordering";
 810         case V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER:          return "H264 ASO Slice Order";
 811         case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING:      return "Enable H264 Hierarchical Coding";
 812         case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE: return "H264 Hierarchical Coding Type";
 813         case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER:return "H264 Number of HC Layers";
 814         case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP:
 815                                                                 return "H264 Set QP Value for HC Layers";
 816         case V4L2_CID_MPEG_VIDEO_H264_CONSTRAINED_INTRA_PREDICTION:
 817                                                                 return "H264 Constrained Intra Pred";
 818         case V4L2_CID_MPEG_VIDEO_H264_CHROMA_QP_INDEX_OFFSET:   return "H264 Chroma QP Index Offset";
 819         case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MIN_QP:           return "H264 I-Frame Minimum QP Value";
 820         case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MAX_QP:           return "H264 I-Frame Maximum QP Value";
 821         case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MIN_QP:           return "H264 P-Frame Minimum QP Value";
 822         case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MAX_QP:           return "H264 P-Frame Maximum QP Value";
 823         case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP:              return "MPEG4 I-Frame QP Value";
 824         case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP:              return "MPEG4 P-Frame QP Value";
 825         case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP:              return "MPEG4 B-Frame QP Value";
 826         case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP:                  return "MPEG4 Minimum QP Value";
 827         case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP:                  return "MPEG4 Maximum QP Value";
 828         case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:                   return "MPEG4 Level";
 829         case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:                 return "MPEG4 Profile";
 830         case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:                    return "Quarter Pixel Search Enable";
 831         case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES:         return "Maximum Bytes in a Slice";
 832         case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB:            return "Number of MBs in a Slice";
 833         case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:              return "Slice Partitioning Method";
 834         case V4L2_CID_MPEG_VIDEO_VBV_SIZE:                      return "VBV Buffer Size";
 835         case V4L2_CID_MPEG_VIDEO_DEC_PTS:                       return "Video Decoder PTS";
 836         case V4L2_CID_MPEG_VIDEO_DEC_FRAME:                     return "Video Decoder Frame Count";
 837         case V4L2_CID_MPEG_VIDEO_VBV_DELAY:                     return "Initial Delay for VBV Control";
 838         case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:             return "Horizontal MV Search Range";
 839         case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:             return "Vertical MV Search Range";
 840         case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:             return "Repeat Sequence Header";
 841         case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME:               return "Force Key Frame";
 842         case V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS:            return "MPEG-2 Slice Parameters";
 843         case V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION:            return "MPEG-2 Quantization Matrices";
 844         case V4L2_CID_MPEG_VIDEO_FWHT_PARAMS:                   return "FWHT Stateless Parameters";
 845         case V4L2_CID_FWHT_I_FRAME_QP:                          return "FWHT I-Frame QP Value";
 846         case V4L2_CID_FWHT_P_FRAME_QP:                          return "FWHT P-Frame QP Value";
 847
 848         /* VPX controls */
 849         case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:            return "VPX Number of Partitions";
 850         case V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4:           return "VPX Intra Mode Decision Disable";
 851         case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:            return "VPX No. of Refs for P Frame";
 852         case V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL:              return "VPX Loop Filter Level Range";
 853         case V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS:          return "VPX Deblocking Effect Control";
 854         case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD:   return "VPX Golden Frame Refresh Period";
 855         case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:          return "VPX Golden Frame Indicator";
 856         case V4L2_CID_MPEG_VIDEO_VPX_MIN_QP:                    return "VPX Minimum QP Value";
 857         case V4L2_CID_MPEG_VIDEO_VPX_MAX_QP:                    return "VPX Maximum QP Value";
 858         case V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP:                return "VPX I-Frame QP Value";
 859         case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP:                return "VPX P-Frame QP Value";
 860         case V4L2_CID_MPEG_VIDEO_VP8_PROFILE:                   return "VP8 Profile";
 861         case V4L2_CID_MPEG_VIDEO_VP9_PROFILE:                   return "VP9 Profile";
 862
 863         /* HEVC controls */
 864         case V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_QP:               return "HEVC I-Frame QP Value";
 865         case V4L2_CID_MPEG_VIDEO_HEVC_P_FRAME_QP:               return "HEVC P-Frame QP Value";
 866         case V4L2_CID_MPEG_VIDEO_HEVC_B_FRAME_QP:               return "HEVC B-Frame QP Value";
 867         case V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP:                   return "HEVC Minimum QP Value";
 868         case V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP:                   return "HEVC Maximum QP Value";
 869         case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE:                  return "HEVC Profile";
 870         case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL:                    return "HEVC Level";
 871         case V4L2_CID_MPEG_VIDEO_HEVC_TIER:                     return "HEVC Tier";
 872         case V4L2_CID_MPEG_VIDEO_HEVC_FRAME_RATE_RESOLUTION:    return "HEVC Frame Rate Resolution";
 873         case V4L2_CID_MPEG_VIDEO_HEVC_MAX_PARTITION_DEPTH:      return "HEVC Maximum Coding Unit Depth";
 874         case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE:             return "HEVC Refresh Type";
 875         case V4L2_CID_MPEG_VIDEO_HEVC_CONST_INTRA_PRED:         return "HEVC Constant Intra Prediction";
 876         case V4L2_CID_MPEG_VIDEO_HEVC_LOSSLESS_CU:              return "HEVC Lossless Encoding";
 877         case V4L2_CID_MPEG_VIDEO_HEVC_WAVEFRONT:                return "HEVC Wavefront";
 878         case V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE:         return "HEVC Loop Filter";
 879         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_QP:                  return "HEVC QP Values";
 880         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE:         return "HEVC Hierarchical Coding Type";
 881         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_LAYER:        return "HEVC Hierarchical Coding Layer";
 882         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L0_QP:        return "HEVC Hierarchical Layer 0 QP";
 883         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L1_QP:        return "HEVC Hierarchical Layer 1 QP";
 884         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L2_QP:        return "HEVC Hierarchical Layer 2 QP";
 885         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L3_QP:        return "HEVC Hierarchical Layer 3 QP";
 886         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L4_QP:        return "HEVC Hierarchical Layer 4 QP";
 887         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_QP:        return "HEVC Hierarchical Layer 5 QP";
 888         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L6_QP:        return "HEVC Hierarchical Layer 6 QP";
 889         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L0_BR:        return "HEVC Hierarchical Lay 0 BitRate";
 890         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L1_BR:        return "HEVC Hierarchical Lay 1 BitRate";
 891         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L2_BR:        return "HEVC Hierarchical Lay 2 BitRate";
 892         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L3_BR:        return "HEVC Hierarchical Lay 3 BitRate";
 893         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L4_BR:        return "HEVC Hierarchical Lay 4 BitRate";
 894         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_BR:        return "HEVC Hierarchical Lay 5 BitRate";
 895         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L6_BR:        return "HEVC Hierarchical Lay 6 BitRate";
 896         case V4L2_CID_MPEG_VIDEO_HEVC_GENERAL_PB:               return "HEVC General PB";
 897         case V4L2_CID_MPEG_VIDEO_HEVC_TEMPORAL_ID:              return "HEVC Temporal ID";
 898         case V4L2_CID_MPEG_VIDEO_HEVC_STRONG_SMOOTHING:         return "HEVC Strong Intra Smoothing";
 899         case V4L2_CID_MPEG_VIDEO_HEVC_INTRA_PU_SPLIT:           return "HEVC Intra PU Split";
 900         case V4L2_CID_MPEG_VIDEO_HEVC_TMV_PREDICTION:           return "HEVC TMV Prediction";
 901         case V4L2_CID_MPEG_VIDEO_HEVC_MAX_NUM_MERGE_MV_MINUS1:  return "HEVC Max Num of Candidate MVs";
 902         case V4L2_CID_MPEG_VIDEO_HEVC_WITHOUT_STARTCODE:        return "HEVC ENC Without Startcode";
 903         case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_PERIOD:           return "HEVC Num of I-Frame b/w 2 IDR";
 904         case V4L2_CID_MPEG_VIDEO_HEVC_LF_BETA_OFFSET_DIV2:      return "HEVC Loop Filter Beta Offset";
 905         case V4L2_CID_MPEG_VIDEO_HEVC_LF_TC_OFFSET_DIV2:        return "HEVC Loop Filter TC Offset";
 906         case V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD:     return "HEVC Size of Length Field";
 907         case V4L2_CID_MPEG_VIDEO_REF_NUMBER_FOR_PFRAMES:        return "Reference Frames for a P-Frame";
 908         case V4L2_CID_MPEG_VIDEO_PREPEND_SPSPPS_TO_IDR:         return "Prepend SPS and PPS to IDR";
 909
 910         /* CAMERA controls */
 911         /* Keep the order of the 'case's the same as in v4l2-controls.h! */
 912         case V4L2_CID_CAMERA_CLASS:             return "Camera Controls";
 913         case V4L2_CID_EXPOSURE_AUTO:            return "Auto Exposure";
 914         case V4L2_CID_EXPOSURE_ABSOLUTE:        return "Exposure Time, Absolute";
 915         case V4L2_CID_EXPOSURE_AUTO_PRIORITY:   return "Exposure, Dynamic Framerate";
 916         case V4L2_CID_PAN_RELATIVE:             return "Pan, Relative";
 917         case V4L2_CID_TILT_RELATIVE:            return "Tilt, Relative";
 918         case V4L2_CID_PAN_RESET:                return "Pan, Reset";
 919         case V4L2_CID_TILT_RESET:               return "Tilt, Reset";
 920         case V4L2_CID_PAN_ABSOLUTE:             return "Pan, Absolute";
 921         case V4L2_CID_TILT_ABSOLUTE:            return "Tilt, Absolute";
 922         case V4L2_CID_FOCUS_ABSOLUTE:           return "Focus, Absolute";
 923         case V4L2_CID_FOCUS_RELATIVE:           return "Focus, Relative";
 924         case V4L2_CID_FOCUS_AUTO:               return "Focus, Automatic Continuous";
 925         case V4L2_CID_ZOOM_ABSOLUTE:            return "Zoom, Absolute";
 926         case V4L2_CID_ZOOM_RELATIVE:            return "Zoom, Relative";
 927         case V4L2_CID_ZOOM_CONTINUOUS:          return "Zoom, Continuous";
 928         case V4L2_CID_PRIVACY:                  return "Privacy";
 929         case V4L2_CID_IRIS_ABSOLUTE:            return "Iris, Absolute";
 930         case V4L2_CID_IRIS_RELATIVE:            return "Iris, Relative";
 931         case V4L2_CID_AUTO_EXPOSURE_BIAS:       return "Auto Exposure, Bias";
 932         case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
 933         case V4L2_CID_WIDE_DYNAMIC_RANGE:       return "Wide Dynamic Range";
 934         case V4L2_CID_IMAGE_STABILIZATION:      return "Image Stabilization";
 935         case V4L2_CID_ISO_SENSITIVITY:          return "ISO Sensitivity";
 936         case V4L2_CID_ISO_SENSITIVITY_AUTO:     return "ISO Sensitivity, Auto";
 937         case V4L2_CID_EXPOSURE_METERING:        return "Exposure, Metering Mode";
 938         case V4L2_CID_SCENE_MODE:               return "Scene Mode";
 939         case V4L2_CID_3A_LOCK:                  return "3A Lock";
 940         case V4L2_CID_AUTO_FOCUS_START:         return "Auto Focus, Start";
 941         case V4L2_CID_AUTO_FOCUS_STOP:          return "Auto Focus, Stop";
 942         case V4L2_CID_AUTO_FOCUS_STATUS:        return "Auto Focus, Status";
 943         case V4L2_CID_AUTO_FOCUS_RANGE:         return "Auto Focus, Range";
 944         case V4L2_CID_PAN_SPEED:                return "Pan, Speed";
 945         case V4L2_CID_TILT_SPEED:               return "Tilt, Speed";
 946
 947         /* FM Radio Modulator controls */
 948         /* Keep the order of the 'case's the same as in v4l2-controls.h! */
 949         case V4L2_CID_FM_TX_CLASS:              return "FM Radio Modulator Controls";
 950         case V4L2_CID_RDS_TX_DEVIATION:         return "RDS Signal Deviation";
 951         case V4L2_CID_RDS_TX_PI:                return "RDS Program ID";
 952         case V4L2_CID_RDS_TX_PTY:               return "RDS Program Type";
 953         case V4L2_CID_RDS_TX_PS_NAME:           return "RDS PS Name";
 954         case V4L2_CID_RDS_TX_RADIO_TEXT:        return "RDS Radio Text";
 955         case V4L2_CID_RDS_TX_MONO_STEREO:       return "RDS Stereo";
 956         case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD:   return "RDS Artificial Head";
 957         case V4L2_CID_RDS_TX_COMPRESSED:        return "RDS Compressed";
 958         case V4L2_CID_RDS_TX_DYNAMIC_PTY:       return "RDS Dynamic PTY";
 959         case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
 960         case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM:   return "RDS Traffic Program";
 961         case V4L2_CID_RDS_TX_MUSIC_SPEECH:      return "RDS Music";
 962         case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE:  return "RDS Enable Alt Frequencies";
 963         case V4L2_CID_RDS_TX_ALT_FREQS:         return "RDS Alternate Frequencies";
 964         case V4L2_CID_AUDIO_LIMITER_ENABLED:    return "Audio Limiter Feature Enabled";
 965         case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
 966         case V4L2_CID_AUDIO_LIMITER_DEVIATION:  return "Audio Limiter Deviation";
 967         case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
 968         case V4L2_CID_AUDIO_COMPRESSION_GAIN:   return "Audio Compression Gain";
 969         case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
 970         case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
 971         case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
 972         case V4L2_CID_PILOT_TONE_ENABLED:       return "Pilot Tone Feature Enabled";
 973         case V4L2_CID_PILOT_TONE_DEVIATION:     return "Pilot Tone Deviation";
 974         case V4L2_CID_PILOT_TONE_FREQUENCY:     return "Pilot Tone Frequency";
 975         case V4L2_CID_TUNE_PREEMPHASIS:         return "Pre-Emphasis";
 976         case V4L2_CID_TUNE_POWER_LEVEL:         return "Tune Power Level";
 977         case V4L2_CID_TUNE_ANTENNA_CAPACITOR:   return "Tune Antenna Capacitor";
 978
 979         /* Flash controls */
 980         /* Keep the order of the 'case's the same as in v4l2-controls.h! */
 981         case V4L2_CID_FLASH_CLASS:              return "Flash Controls";
 982         case V4L2_CID_FLASH_LED_MODE:           return "LED Mode";
 983         case V4L2_CID_FLASH_STROBE_SOURCE:      return "Strobe Source";
 984         case V4L2_CID_FLASH_STROBE:             return "Strobe";
 985         case V4L2_CID_FLASH_STROBE_STOP:        return "Stop Strobe";
 986         case V4L2_CID_FLASH_STROBE_STATUS:      return "Strobe Status";
 987         case V4L2_CID_FLASH_TIMEOUT:            return "Strobe Timeout";
 988         case V4L2_CID_FLASH_INTENSITY:          return "Intensity, Flash Mode";
 989         case V4L2_CID_FLASH_TORCH_INTENSITY:    return "Intensity, Torch Mode";
 990         case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
 991         case V4L2_CID_FLASH_FAULT:              return "Faults";
 992         case V4L2_CID_FLASH_CHARGE:             return "Charge";
 993         case V4L2_CID_FLASH_READY:              return "Ready to Strobe";
 994
 995         /* JPEG encoder controls */
 996         /* Keep the order of the 'case's the same as in v4l2-controls.h! */
 997         case V4L2_CID_JPEG_CLASS:               return "JPEG Compression Controls";
 998         case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:  return "Chroma Subsampling";
 999         case V4L2_CID_JPEG_RESTART_INTERVAL:    return "Restart Interval";
1000         case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
1001         case V4L2_CID_JPEG_ACTIVE_MARKER:       return "Active Markers";
1002
1003         /* Image source controls */
1004         /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1005         case V4L2_CID_IMAGE_SOURCE_CLASS:       return "Image Source Controls";
1006         case V4L2_CID_VBLANK:                   return "Vertical Blanking";
1007         case V4L2_CID_HBLANK:                   return "Horizontal Blanking";
1008         case V4L2_CID_ANALOGUE_GAIN:            return "Analogue Gain";
1009         case V4L2_CID_TEST_PATTERN_RED:         return "Red Pixel Value";
1010         case V4L2_CID_TEST_PATTERN_GREENR:      return "Green (Red) Pixel Value";
1011         case V4L2_CID_TEST_PATTERN_BLUE:        return "Blue Pixel Value";
1012         case V4L2_CID_TEST_PATTERN_GREENB:      return "Green (Blue) Pixel Value";
1013
1014         /* Image processing controls */
1015         /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1016         case V4L2_CID_IMAGE_PROC_CLASS:         return "Image Processing Controls";
1017         case V4L2_CID_LINK_FREQ:                return "Link Frequency";
1018         case V4L2_CID_PIXEL_RATE:               return "Pixel Rate";
1019         case V4L2_CID_TEST_PATTERN:             return "Test Pattern";
1020         case V4L2_CID_DEINTERLACING_MODE:       return "Deinterlacing Mode";
1021         case V4L2_CID_DIGITAL_GAIN:             return "Digital Gain";
1022
1023         /* DV controls */
1024         /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1025         case V4L2_CID_DV_CLASS:                 return "Digital Video Controls";
1026         case V4L2_CID_DV_TX_HOTPLUG:            return "Hotplug Present";
1027         case V4L2_CID_DV_TX_RXSENSE:            return "RxSense Present";
1028         case V4L2_CID_DV_TX_EDID_PRESENT:       return "EDID Present";
1029         case V4L2_CID_DV_TX_MODE:               return "Transmit Mode";
1030         case V4L2_CID_DV_TX_RGB_RANGE:          return "Tx RGB Quantization Range";
1031         case V4L2_CID_DV_TX_IT_CONTENT_TYPE:    return "Tx IT Content Type";
1032         case V4L2_CID_DV_RX_POWER_PRESENT:      return "Power Present";
1033         case V4L2_CID_DV_RX_RGB_RANGE:          return "Rx RGB Quantization Range";
1034         case V4L2_CID_DV_RX_IT_CONTENT_TYPE:    return "Rx IT Content Type";
1035
1036         case V4L2_CID_FM_RX_CLASS:              return "FM Radio Receiver Controls";
1037         case V4L2_CID_TUNE_DEEMPHASIS:          return "De-Emphasis";
1038         case V4L2_CID_RDS_RECEPTION:            return "RDS Reception";
1039         case V4L2_CID_RF_TUNER_CLASS:           return "RF Tuner Controls";
1040         case V4L2_CID_RF_TUNER_RF_GAIN:         return "RF Gain";
1041         case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:   return "LNA Gain, Auto";
1042         case V4L2_CID_RF_TUNER_LNA_GAIN:        return "LNA Gain";
1043         case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO: return "Mixer Gain, Auto";
1044         case V4L2_CID_RF_TUNER_MIXER_GAIN:      return "Mixer Gain";
1045         case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:    return "IF Gain, Auto";
1046         case V4L2_CID_RF_TUNER_IF_GAIN:         return "IF Gain";
1047         case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:  return "Bandwidth, Auto";
1048         case V4L2_CID_RF_TUNER_BANDWIDTH:       return "Bandwidth";
1049         case V4L2_CID_RF_TUNER_PLL_LOCK:        return "PLL Lock";
1050         case V4L2_CID_RDS_RX_PTY:               return "RDS Program Type";
1051         case V4L2_CID_RDS_RX_PS_NAME:           return "RDS PS Name";
1052         case V4L2_CID_RDS_RX_RADIO_TEXT:        return "RDS Radio Text";
1053         case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
1054         case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:   return "RDS Traffic Program";
1055         case V4L2_CID_RDS_RX_MUSIC_SPEECH:      return "RDS Music";
1056
1057         /* Detection controls */
1058         /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1059         case V4L2_CID_DETECT_CLASS:             return "Detection Controls";
1060         case V4L2_CID_DETECT_MD_MODE:           return "Motion Detection Mode";
1061         case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD: return "MD Global Threshold";
1062         case V4L2_CID_DETECT_MD_THRESHOLD_GRID: return "MD Threshold Grid";
1063         case V4L2_CID_DETECT_MD_REGION_GRID:    return "MD Region Grid";
1064         default:
1065                 return NULL;
1066         }
1067 }
1068 EXPORT_SYMBOL(v4l2_ctrl_get_name);
1069
1070 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
1071                     s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags)
1072 {
1073         *name = v4l2_ctrl_get_name(id);
1074         *flags = 0;
1075
1076         switch (id) {
1077         case V4L2_CID_AUDIO_MUTE:
1078         case V4L2_CID_AUDIO_LOUDNESS:
1079         case V4L2_CID_AUTO_WHITE_BALANCE:
1080         case V4L2_CID_AUTOGAIN:
1081         case V4L2_CID_HFLIP:
1082         case V4L2_CID_VFLIP:
1083         case V4L2_CID_HUE_AUTO:
1084         case V4L2_CID_CHROMA_AGC:
1085         case V4L2_CID_COLOR_KILLER:
1086         case V4L2_CID_AUTOBRIGHTNESS:
1087         case V4L2_CID_MPEG_AUDIO_MUTE:
1088         case V4L2_CID_MPEG_VIDEO_MUTE:
1089         case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
1090         case V4L2_CID_MPEG_VIDEO_PULLDOWN:
1091         case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
1092         case V4L2_CID_FOCUS_AUTO:
1093         case V4L2_CID_PRIVACY:
1094         case V4L2_CID_AUDIO_LIMITER_ENABLED:
1095         case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
1096         case V4L2_CID_PILOT_TONE_ENABLED:
1097         case V4L2_CID_ILLUMINATORS_1:
1098         case V4L2_CID_ILLUMINATORS_2:
1099         case V4L2_CID_FLASH_STROBE_STATUS:
1100         case V4L2_CID_FLASH_CHARGE:
1101         case V4L2_CID_FLASH_READY:
1102         case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
1103         case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
1104         case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
1105         case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
1106         case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
1107         case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
1108         case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
1109         case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
1110         case V4L2_CID_WIDE_DYNAMIC_RANGE:
1111         case V4L2_CID_IMAGE_STABILIZATION:
1112         case V4L2_CID_RDS_RECEPTION:
1113         case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:
1114         case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:
1115         case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:
1116         case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
1117         case V4L2_CID_RF_TUNER_PLL_LOCK:
1118         case V4L2_CID_RDS_TX_MONO_STEREO:
1119         case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD:
1120         case V4L2_CID_RDS_TX_COMPRESSED:
1121         case V4L2_CID_RDS_TX_DYNAMIC_PTY:
1122         case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT:
1123         case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM:
1124         case V4L2_CID_RDS_TX_MUSIC_SPEECH:
1125         case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE:
1126         case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1127         case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1128         case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1129                 *type = V4L2_CTRL_TYPE_BOOLEAN;
1130                 *min = 0;
1131                 *max = *step = 1;
1132                 break;
1133         case V4L2_CID_ROTATE:
1134                 *type = V4L2_CTRL_TYPE_INTEGER;
1135                 *flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;
1136                 break;
1137         case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:
1138         case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:
1139                 *type = V4L2_CTRL_TYPE_INTEGER;
1140                 break;
1141         case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME:
1142         case V4L2_CID_PAN_RESET:
1143         case V4L2_CID_TILT_RESET:
1144         case V4L2_CID_FLASH_STROBE:
1145         case V4L2_CID_FLASH_STROBE_STOP:
1146         case V4L2_CID_AUTO_FOCUS_START:
1147         case V4L2_CID_AUTO_FOCUS_STOP:
1148                 *type = V4L2_CTRL_TYPE_BUTTON;
1149                 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1150                           V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1151                 *min = *max = *step = *def = 0;
1152                 break;
1153         case V4L2_CID_POWER_LINE_FREQUENCY:
1154         case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
1155         case V4L2_CID_MPEG_AUDIO_ENCODING:
1156         case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
1157         case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
1158         case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
1159         case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
1160         case V4L2_CID_MPEG_AUDIO_MODE:
1161         case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
1162         case V4L2_CID_MPEG_AUDIO_EMPHASIS:
1163         case V4L2_CID_MPEG_AUDIO_CRC:
1164         case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
1165         case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
1166         case V4L2_CID_MPEG_VIDEO_ENCODING:
1167         case V4L2_CID_MPEG_VIDEO_ASPECT:
1168         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1169         case V4L2_CID_MPEG_STREAM_TYPE:
1170         case V4L2_CID_MPEG_STREAM_VBI_FMT:
1171         case V4L2_CID_EXPOSURE_AUTO:
1172         case V4L2_CID_AUTO_FOCUS_RANGE:
1173         case V4L2_CID_COLORFX:
1174         case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
1175         case V4L2_CID_TUNE_PREEMPHASIS:
1176         case V4L2_CID_FLASH_LED_MODE:
1177         case V4L2_CID_FLASH_STROBE_SOURCE:
1178         case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
1179         case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
1180         case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
1181         case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
1182         case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
1183         case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
1184         case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
1185         case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
1186         case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
1187         case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
1188         case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
1189         case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
1190         case V4L2_CID_ISO_SENSITIVITY_AUTO:
1191         case V4L2_CID_EXPOSURE_METERING:
1192         case V4L2_CID_SCENE_MODE:
1193         case V4L2_CID_DV_TX_MODE:
1194         case V4L2_CID_DV_TX_RGB_RANGE:
1195         case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
1196         case V4L2_CID_DV_RX_RGB_RANGE:
1197         case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1198         case V4L2_CID_TEST_PATTERN:
1199         case V4L2_CID_DEINTERLACING_MODE:
1200         case V4L2_CID_TUNE_DEEMPHASIS:
1201         case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
1202         case V4L2_CID_MPEG_VIDEO_VP8_PROFILE:
1203         case V4L2_CID_MPEG_VIDEO_VP9_PROFILE:
1204         case V4L2_CID_DETECT_MD_MODE:
1205         case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE:
1206         case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL:
1207         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE:
1208         case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE:
1209         case V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD:
1210         case V4L2_CID_MPEG_VIDEO_HEVC_TIER:
1211         case V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE:
1212                 *type = V4L2_CTRL_TYPE_MENU;
1213                 break;
1214         case V4L2_CID_LINK_FREQ:
1215                 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1216                 break;
1217         case V4L2_CID_RDS_TX_PS_NAME:
1218         case V4L2_CID_RDS_TX_RADIO_TEXT:
1219         case V4L2_CID_RDS_RX_PS_NAME:
1220         case V4L2_CID_RDS_RX_RADIO_TEXT:
1221                 *type = V4L2_CTRL_TYPE_STRING;
1222                 break;
1223         case V4L2_CID_ISO_SENSITIVITY:
1224         case V4L2_CID_AUTO_EXPOSURE_BIAS:
1225         case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
1226         case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
1227                 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1228                 break;
1229         case V4L2_CID_USER_CLASS:
1230         case V4L2_CID_CAMERA_CLASS:
1231         case V4L2_CID_MPEG_CLASS:
1232         case V4L2_CID_FM_TX_CLASS:
1233         case V4L2_CID_FLASH_CLASS:
1234         case V4L2_CID_JPEG_CLASS:
1235         case V4L2_CID_IMAGE_SOURCE_CLASS:
1236         case V4L2_CID_IMAGE_PROC_CLASS:
1237         case V4L2_CID_DV_CLASS:
1238         case V4L2_CID_FM_RX_CLASS:
1239         case V4L2_CID_RF_TUNER_CLASS:
1240         case V4L2_CID_DETECT_CLASS:
1241                 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
1242                 /* You can neither read not write these */
1243                 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
1244                 *min = *max = *step = *def = 0;
1245                 break;
1246         case V4L2_CID_BG_COLOR:
1247                 *type = V4L2_CTRL_TYPE_INTEGER;
1248                 *step = 1;
1249                 *min = 0;
1250                 /* Max is calculated as RGB888 that is 2^24 */
1251                 *max = 0xFFFFFF;
1252                 break;
1253         case V4L2_CID_FLASH_FAULT:
1254         case V4L2_CID_JPEG_ACTIVE_MARKER:
1255         case V4L2_CID_3A_LOCK:
1256         case V4L2_CID_AUTO_FOCUS_STATUS:
1257         case V4L2_CID_DV_TX_HOTPLUG:
1258         case V4L2_CID_DV_TX_RXSENSE:
1259         case V4L2_CID_DV_TX_EDID_PRESENT:
1260         case V4L2_CID_DV_RX_POWER_PRESENT:
1261                 *type = V4L2_CTRL_TYPE_BITMASK;
1262                 break;
1263         case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1264         case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1265                 *type = V4L2_CTRL_TYPE_INTEGER;
1266                 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1267                 break;
1268         case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1269                 *type = V4L2_CTRL_TYPE_INTEGER64;
1270                 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1271                 *min = *def = 0;
1272                 *max = 0x1ffffffffLL;
1273                 *step = 1;
1274                 break;
1275         case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1276                 *type = V4L2_CTRL_TYPE_INTEGER64;
1277                 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1278                 *min = *def = 0;
1279                 *max = 0x7fffffffffffffffLL;
1280                 *step = 1;
1281                 break;
1282         case V4L2_CID_PIXEL_RATE:
1283                 *type = V4L2_CTRL_TYPE_INTEGER64;
1284                 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1285                 break;
1286         case V4L2_CID_DETECT_MD_REGION_GRID:
1287                 *type = V4L2_CTRL_TYPE_U8;
1288                 break;
1289         case V4L2_CID_DETECT_MD_THRESHOLD_GRID:
1290                 *type = V4L2_CTRL_TYPE_U16;
1291                 break;
1292         case V4L2_CID_RDS_TX_ALT_FREQS:
1293                 *type = V4L2_CTRL_TYPE_U32;
1294                 break;
1295         case V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS:
1296                 *type = V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS;
1297                 break;
1298         case V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION:
1299                 *type = V4L2_CTRL_TYPE_MPEG2_QUANTIZATION;
1300                 break;
1301         case V4L2_CID_MPEG_VIDEO_FWHT_PARAMS:
1302                 *type = V4L2_CTRL_TYPE_FWHT_PARAMS;
1303                 break;
1304         default:
1305                 *type = V4L2_CTRL_TYPE_INTEGER;
1306                 break;
1307         }
1308         switch (id) {
1309         case V4L2_CID_MPEG_AUDIO_ENCODING:
1310         case V4L2_CID_MPEG_AUDIO_MODE:
1311         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1312         case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1313         case V4L2_CID_MPEG_STREAM_TYPE:
1314                 *flags |= V4L2_CTRL_FLAG_UPDATE;
1315                 break;
1316         case V4L2_CID_AUDIO_VOLUME:
1317         case V4L2_CID_AUDIO_BALANCE:
1318         case V4L2_CID_AUDIO_BASS:
1319         case V4L2_CID_AUDIO_TREBLE:
1320         case V4L2_CID_BRIGHTNESS:
1321         case V4L2_CID_CONTRAST:
1322         case V4L2_CID_SATURATION:
1323         case V4L2_CID_HUE:
1324         case V4L2_CID_RED_BALANCE:
1325         case V4L2_CID_BLUE_BALANCE:
1326         case V4L2_CID_GAMMA:
1327         case V4L2_CID_SHARPNESS:
1328         case V4L2_CID_CHROMA_GAIN:
1329         case V4L2_CID_RDS_TX_DEVIATION:
1330         case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1331         case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1332         case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1333         case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1334         case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1335         case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1336         case V4L2_CID_PILOT_TONE_DEVIATION:
1337         case V4L2_CID_PILOT_TONE_FREQUENCY:
1338         case V4L2_CID_TUNE_POWER_LEVEL:
1339         case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1340         case V4L2_CID_RF_TUNER_RF_GAIN:
1341         case V4L2_CID_RF_TUNER_LNA_GAIN:
1342         case V4L2_CID_RF_TUNER_MIXER_GAIN:
1343         case V4L2_CID_RF_TUNER_IF_GAIN:
1344         case V4L2_CID_RF_TUNER_BANDWIDTH:
1345         case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD:
1346                 *flags |= V4L2_CTRL_FLAG_SLIDER;
1347                 break;
1348         case V4L2_CID_PAN_RELATIVE:
1349         case V4L2_CID_TILT_RELATIVE:
1350         case V4L2_CID_FOCUS_RELATIVE:
1351         case V4L2_CID_IRIS_RELATIVE:
1352         case V4L2_CID_ZOOM_RELATIVE:
1353                 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1354                           V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1355                 break;
1356         case V4L2_CID_FLASH_STROBE_STATUS:
1357         case V4L2_CID_AUTO_FOCUS_STATUS:
1358         case V4L2_CID_FLASH_READY:
1359         case V4L2_CID_DV_TX_HOTPLUG:
1360         case V4L2_CID_DV_TX_RXSENSE:
1361         case V4L2_CID_DV_TX_EDID_PRESENT:
1362         case V4L2_CID_DV_RX_POWER_PRESENT:
1363         case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1364         case V4L2_CID_RDS_RX_PTY:
1365         case V4L2_CID_RDS_RX_PS_NAME:
1366         case V4L2_CID_RDS_RX_RADIO_TEXT:
1367         case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1368         case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1369         case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1370                 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1371                 break;
1372         case V4L2_CID_RF_TUNER_PLL_LOCK:
1373                 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1374                 break;
1375         }
1376 }
1377 EXPORT_SYMBOL(v4l2_ctrl_fill);
1378
1379 static u32 user_flags(const struct v4l2_ctrl *ctrl)
1380 {
1381         u32 flags = ctrl->flags;
1382
1383         if (ctrl->is_ptr)
1384                 flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
1385
1386         return flags;
1387 }
1388
1389 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1390 {
1391         memset(ev, 0, sizeof(*ev));
1392         ev->type = V4L2_EVENT_CTRL;
1393         ev->id = ctrl->id;
1394         ev->u.ctrl.changes = changes;
1395         ev->u.ctrl.type = ctrl->type;
1396         ev->u.ctrl.flags = user_flags(ctrl);
1397         if (ctrl->is_ptr)
1398                 ev->u.ctrl.value64 = 0;
1399         else
1400                 ev->u.ctrl.value64 = *ctrl->p_cur.p_s64;
1401         ev->u.ctrl.minimum = ctrl->minimum;
1402         ev->u.ctrl.maximum = ctrl->maximum;
1403         if (ctrl->type == V4L2_CTRL_TYPE_MENU
1404             || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1405                 ev->u.ctrl.step = 1;
1406         else
1407                 ev->u.ctrl.step = ctrl->step;
1408         ev->u.ctrl.default_value = ctrl->default_value;
1409 }
1410
1411 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1412 {
1413         struct v4l2_event ev;
1414         struct v4l2_subscribed_event *sev;
1415
1416         if (list_empty(&ctrl->ev_subs))
1417                 return;
1418         fill_event(&ev, ctrl, changes);
1419
1420         list_for_each_entry(sev, &ctrl->ev_subs, node)
1421                 if (sev->fh != fh ||
1422                     (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1423                         v4l2_event_queue_fh(sev->fh, &ev);
1424 }
1425
1426 static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
1427                       union v4l2_ctrl_ptr ptr1,
1428                       union v4l2_ctrl_ptr ptr2)
1429 {
1430         switch (ctrl->type) {
1431         case V4L2_CTRL_TYPE_BUTTON:
1432                 return false;
1433         case V4L2_CTRL_TYPE_STRING:
1434                 idx *= ctrl->elem_size;
1435                 /* strings are always 0-terminated */
1436                 return !strcmp(ptr1.p_char + idx, ptr2.p_char + idx);
1437         case V4L2_CTRL_TYPE_INTEGER64:
1438                 return ptr1.p_s64[idx] == ptr2.p_s64[idx];
1439         case V4L2_CTRL_TYPE_U8:
1440                 return ptr1.p_u8[idx] == ptr2.p_u8[idx];
1441         case V4L2_CTRL_TYPE_U16:
1442                 return ptr1.p_u16[idx] == ptr2.p_u16[idx];
1443         case V4L2_CTRL_TYPE_U32:
1444                 return ptr1.p_u32[idx] == ptr2.p_u32[idx];
1445         default:
1446                 if (ctrl->is_int)
1447                         return ptr1.p_s32[idx] == ptr2.p_s32[idx];
1448                 idx *= ctrl->elem_size;
1449                 return !memcmp(ptr1.p + idx, ptr2.p + idx, ctrl->elem_size);
1450         }
1451 }
1452
1453 static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
1454                      union v4l2_ctrl_ptr ptr)
1455 {
1456         switch (ctrl->type) {
1457         case V4L2_CTRL_TYPE_STRING:
1458                 idx *= ctrl->elem_size;
1459                 memset(ptr.p_char + idx, ' ', ctrl->minimum);
1460                 ptr.p_char[idx + ctrl->minimum] = '\0';
1461                 break;
1462         case V4L2_CTRL_TYPE_INTEGER64:
1463                 ptr.p_s64[idx] = ctrl->default_value;
1464                 break;
1465         case V4L2_CTRL_TYPE_INTEGER:
1466         case V4L2_CTRL_TYPE_INTEGER_MENU:
1467         case V4L2_CTRL_TYPE_MENU:
1468         case V4L2_CTRL_TYPE_BITMASK:
1469         case V4L2_CTRL_TYPE_BOOLEAN:
1470                 ptr.p_s32[idx] = ctrl->default_value;
1471                 break;
1472         case V4L2_CTRL_TYPE_U8:
1473                 ptr.p_u8[idx] = ctrl->default_value;
1474                 break;
1475         case V4L2_CTRL_TYPE_U16:
1476                 ptr.p_u16[idx] = ctrl->default_value;
1477                 break;
1478         case V4L2_CTRL_TYPE_U32:
1479                 ptr.p_u32[idx] = ctrl->default_value;
1480                 break;
1481         default:
1482                 idx *= ctrl->elem_size;
1483                 memset(ptr.p + idx, 0, ctrl->elem_size);
1484                 break;
1485         }
1486 }
1487
1488 static void std_log(const struct v4l2_ctrl *ctrl)
1489 {
1490         union v4l2_ctrl_ptr ptr = ctrl->p_cur;
1491
1492         if (ctrl->is_array) {
1493                 unsigned i;
1494
1495                 for (i = 0; i < ctrl->nr_of_dims; i++)
1496                         pr_cont("[%u]", ctrl->dims[i]);
1497                 pr_cont(" ");
1498         }
1499
1500         switch (ctrl->type) {
1501         case V4L2_CTRL_TYPE_INTEGER:
1502                 pr_cont("%d", *ptr.p_s32);
1503                 break;
1504         case V4L2_CTRL_TYPE_BOOLEAN:
1505                 pr_cont("%s", *ptr.p_s32 ? "true" : "false");
1506                 break;
1507         case V4L2_CTRL_TYPE_MENU:
1508                 pr_cont("%s", ctrl->qmenu[*ptr.p_s32]);
1509                 break;
1510         case V4L2_CTRL_TYPE_INTEGER_MENU:
1511                 pr_cont("%lld", ctrl->qmenu_int[*ptr.p_s32]);
1512                 break;
1513         case V4L2_CTRL_TYPE_BITMASK:
1514                 pr_cont("0x%08x", *ptr.p_s32);
1515                 break;
1516         case V4L2_CTRL_TYPE_INTEGER64:
1517                 pr_cont("%lld", *ptr.p_s64);
1518                 break;
1519         case V4L2_CTRL_TYPE_STRING:
1520                 pr_cont("%s", ptr.p_char);
1521                 break;
1522         case V4L2_CTRL_TYPE_U8:
1523                 pr_cont("%u", (unsigned)*ptr.p_u8);
1524                 break;
1525         case V4L2_CTRL_TYPE_U16:
1526                 pr_cont("%u", (unsigned)*ptr.p_u16);
1527                 break;
1528         case V4L2_CTRL_TYPE_U32:
1529                 pr_cont("%u", (unsigned)*ptr.p_u32);
1530                 break;
1531         default:
1532                 pr_cont("unknown type %d", ctrl->type);
1533                 break;
1534         }
1535 }
1536
1537 /*
1538  * Round towards the closest legal value. Be careful when we are
1539  * close to the maximum range of the control type to prevent
1540  * wrap-arounds.
1541  */
1542 #define ROUND_TO_RANGE(val, offset_type, ctrl)                  \
1543 ({                                                              \
1544         offset_type offset;                                     \
1545         if ((ctrl)->maximum >= 0 &&                             \
1546             val >= (ctrl)->maximum - (s32)((ctrl)->step / 2))   \
1547                 val = (ctrl)->maximum;                          \
1548         else                                                    \
1549                 val += (s32)((ctrl)->step / 2);                 \
1550         val = clamp_t(typeof(val), val,                         \
1551                       (ctrl)->minimum, (ctrl)->maximum);        \
1552         offset = (val) - (ctrl)->minimum;                       \
1553         offset = (ctrl)->step * (offset / (u32)(ctrl)->step);   \
1554         val = (ctrl)->minimum + offset;                         \
1555         0;                                                      \
1556 })
1557
1558 /* Validate a new control */
1559 static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
1560                         union v4l2_ctrl_ptr ptr)
1561 {
1562         struct v4l2_ctrl_mpeg2_slice_params *p_mpeg2_slice_params;
1563         size_t len;
1564         u64 offset;
1565         s64 val;
1566
1567         switch ((u32)ctrl->type) {
1568         case V4L2_CTRL_TYPE_INTEGER:
1569                 return ROUND_TO_RANGE(ptr.p_s32[idx], u32, ctrl);
1570         case V4L2_CTRL_TYPE_INTEGER64:
1571                 /*
1572                  * We can't use the ROUND_TO_RANGE define here due to
1573                  * the u64 divide that needs special care.
1574                  */
1575                 val = ptr.p_s64[idx];
1576                 if (ctrl->maximum >= 0 && val >= ctrl->maximum - (s64)(ctrl->step / 2))
1577                         val = ctrl->maximum;
1578                 else
1579                         val += (s64)(ctrl->step / 2);
1580                 val = clamp_t(s64, val, ctrl->minimum, ctrl->maximum);
1581                 offset = val - ctrl->minimum;
1582                 do_div(offset, ctrl->step);
1583                 ptr.p_s64[idx] = ctrl->minimum + offset * ctrl->step;
1584                 return 0;
1585         case V4L2_CTRL_TYPE_U8:
1586                 return ROUND_TO_RANGE(ptr.p_u8[idx], u8, ctrl);
1587         case V4L2_CTRL_TYPE_U16:
1588                 return ROUND_TO_RANGE(ptr.p_u16[idx], u16, ctrl);
1589         case V4L2_CTRL_TYPE_U32:
1590                 return ROUND_TO_RANGE(ptr.p_u32[idx], u32, ctrl);
1591
1592         case V4L2_CTRL_TYPE_BOOLEAN:
1593                 ptr.p_s32[idx] = !!ptr.p_s32[idx];
1594                 return 0;
1595
1596         case V4L2_CTRL_TYPE_MENU:
1597         case V4L2_CTRL_TYPE_INTEGER_MENU:
1598                 if (ptr.p_s32[idx] < ctrl->minimum || ptr.p_s32[idx] > ctrl->maximum)
1599                         return -ERANGE;
1600                 if (ctrl->menu_skip_mask & (1ULL << ptr.p_s32[idx]))
1601                         return -EINVAL;
1602                 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1603                     ctrl->qmenu[ptr.p_s32[idx]][0] == '\0')
1604                         return -EINVAL;
1605                 return 0;
1606
1607         case V4L2_CTRL_TYPE_BITMASK:
1608                 ptr.p_s32[idx] &= ctrl->maximum;
1609                 return 0;
1610
1611         case V4L2_CTRL_TYPE_BUTTON:
1612         case V4L2_CTRL_TYPE_CTRL_CLASS:
1613                 ptr.p_s32[idx] = 0;
1614                 return 0;
1615
1616         case V4L2_CTRL_TYPE_STRING:
1617                 idx *= ctrl->elem_size;
1618                 len = strlen(ptr.p_char + idx);
1619                 if (len < ctrl->minimum)
1620                         return -ERANGE;
1621                 if ((len - (u32)ctrl->minimum) % (u32)ctrl->step)
1622                         return -ERANGE;
1623                 return 0;
1624
1625         case V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS:
1626                 p_mpeg2_slice_params = ptr.p;
1627
1628                 switch (p_mpeg2_slice_params->sequence.chroma_format) {
1629                 case 1: /* 4:2:0 */
1630                 case 2: /* 4:2:2 */
1631                 case 3: /* 4:4:4 */
1632                         break;
1633                 default:
1634                         return -EINVAL;
1635                 }
1636
1637                 switch (p_mpeg2_slice_params->picture.intra_dc_precision) {
1638                 case 0: /* 8 bits */
1639                 case 1: /* 9 bits */
1640                 case 2: /* 10 bits */
1641                 case 3: /* 11 bits */
1642                         break;
1643                 default:
1644                         return -EINVAL;
1645                 }
1646
1647                 switch (p_mpeg2_slice_params->picture.picture_structure) {
1648                 case 1: /* interlaced top field */
1649                 case 2: /* interlaced bottom field */
1650                 case 3: /* progressive */
1651                         break;
1652                 default:
1653                         return -EINVAL;
1654                 }
1655
1656                 switch (p_mpeg2_slice_params->picture.picture_coding_type) {
1657                 case V4L2_MPEG2_PICTURE_CODING_TYPE_I:
1658                 case V4L2_MPEG2_PICTURE_CODING_TYPE_P:
1659                 case V4L2_MPEG2_PICTURE_CODING_TYPE_B:
1660                         break;
1661                 default:
1662                         return -EINVAL;
1663                 }
1664
1665                 return 0;
1666
1667         case V4L2_CTRL_TYPE_MPEG2_QUANTIZATION:
1668                 return 0;
1669
1670         case V4L2_CTRL_TYPE_FWHT_PARAMS:
1671                 return 0;
1672
1673         default:
1674                 return -EINVAL;
1675         }
1676 }
1677
1678 static const struct v4l2_ctrl_type_ops std_type_ops = {
1679         .equal = std_equal,
1680         .init = std_init,
1681         .log = std_log,
1682         .validate = std_validate,
1683 };
1684
1685 /* Helper function: copy the given control value back to the caller */
1686 static int ptr_to_user(struct v4l2_ext_control *c,
1687                        struct v4l2_ctrl *ctrl,
1688                        union v4l2_ctrl_ptr ptr)
1689 {
1690         u32 len;
1691
1692         if (ctrl->is_ptr && !ctrl->is_string)
1693                 return copy_to_user(c->ptr, ptr.p, c->size) ?
1694                        -EFAULT : 0;
1695
1696         switch (ctrl->type) {
1697         case V4L2_CTRL_TYPE_STRING:
1698                 len = strlen(ptr.p_char);
1699                 if (c->size < len + 1) {
1700                         c->size = ctrl->elem_size;
1701                         return -ENOSPC;
1702                 }
1703                 return copy_to_user(c->string, ptr.p_char, len + 1) ?
1704                        -EFAULT : 0;
1705         case V4L2_CTRL_TYPE_INTEGER64:
1706                 c->value64 = *ptr.p_s64;
1707                 break;
1708         default:
1709                 c->value = *ptr.p_s32;
1710                 break;
1711         }
1712         return 0;
1713 }
1714
1715 /* Helper function: copy the current control value back to the caller */
1716 static int cur_to_user(struct v4l2_ext_control *c,
1717                        struct v4l2_ctrl *ctrl)
1718 {
1719         return ptr_to_user(c, ctrl, ctrl->p_cur);
1720 }
1721
1722 /* Helper function: copy the new control value back to the caller */
1723 static int new_to_user(struct v4l2_ext_control *c,
1724                        struct v4l2_ctrl *ctrl)
1725 {
1726         return ptr_to_user(c, ctrl, ctrl->p_new);
1727 }
1728
1729 /* Helper function: copy the request value back to the caller */
1730 static int req_to_user(struct v4l2_ext_control *c,
1731                        struct v4l2_ctrl_ref *ref)
1732 {
1733         return ptr_to_user(c, ref->ctrl, ref->p_req);
1734 }
1735
1736 /* Helper function: copy the initial control value back to the caller */
1737 static int def_to_user(struct v4l2_ext_control *c, struct v4l2_ctrl *ctrl)
1738 {
1739         int idx;
1740
1741         for (idx = 0; idx < ctrl->elems; idx++)
1742                 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
1743
1744         return ptr_to_user(c, ctrl, ctrl->p_new);
1745 }
1746
1747 /* Helper function: copy the caller-provider value to the given control value */
1748 static int user_to_ptr(struct v4l2_ext_control *c,
1749                        struct v4l2_ctrl *ctrl,
1750                        union v4l2_ctrl_ptr ptr)
1751 {
1752         int ret;
1753         u32 size;
1754
1755         ctrl->is_new = 1;
1756         if (ctrl->is_ptr && !ctrl->is_string) {
1757                 unsigned idx;
1758
1759                 ret = copy_from_user(ptr.p, c->ptr, c->size) ? -EFAULT : 0;
1760                 if (ret || !ctrl->is_array)
1761                         return ret;
1762                 for (idx = c->size / ctrl->elem_size; idx < ctrl->elems; idx++)
1763                         ctrl->type_ops->init(ctrl, idx, ptr);
1764                 return 0;
1765         }
1766
1767         switch (ctrl->type) {
1768         case V4L2_CTRL_TYPE_INTEGER64:
1769                 *ptr.p_s64 = c->value64;
1770                 break;
1771         case V4L2_CTRL_TYPE_STRING:
1772                 size = c->size;
1773                 if (size == 0)
1774                         return -ERANGE;
1775                 if (size > ctrl->maximum + 1)
1776                         size = ctrl->maximum + 1;
1777                 ret = copy_from_user(ptr.p_char, c->string, size) ? -EFAULT : 0;
1778                 if (!ret) {
1779                         char last = ptr.p_char[size - 1];
1780
1781                         ptr.p_char[size - 1] = 0;
1782                         /* If the string was longer than ctrl->maximum,
1783                            then return an error. */
1784                         if (strlen(ptr.p_char) == ctrl->maximum && last)
1785                                 return -ERANGE;
1786                 }
1787                 return ret;
1788         default:
1789                 *ptr.p_s32 = c->value;
1790                 break;
1791         }
1792         return 0;
1793 }
1794
1795 /* Helper function: copy the caller-provider value as the new control value */
1796 static int user_to_new(struct v4l2_ext_control *c,
1797                        struct v4l2_ctrl *ctrl)
1798 {
1799         return user_to_ptr(c, ctrl, ctrl->p_new);
1800 }
1801
1802 /* Copy the one value to another. */
1803 static void ptr_to_ptr(struct v4l2_ctrl *ctrl,
1804                        union v4l2_ctrl_ptr from, union v4l2_ctrl_ptr to)
1805 {
1806         if (ctrl == NULL)
1807                 return;
1808         memcpy(to.p, from.p, ctrl->elems * ctrl->elem_size);
1809 }
1810
1811 /* Copy the new value to the current value. */
1812 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
1813 {
1814         bool changed;
1815
1816         if (ctrl == NULL)
1817                 return;
1818
1819         /* has_changed is set by cluster_changed */
1820         changed = ctrl->has_changed;
1821         if (changed)
1822                 ptr_to_ptr(ctrl, ctrl->p_new, ctrl->p_cur);
1823
1824         if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
1825                 /* Note: CH_FLAGS is only set for auto clusters. */
1826                 ctrl->flags &=
1827                         ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1828                 if (!is_cur_manual(ctrl->cluster[0])) {
1829                         ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1830                         if (ctrl->cluster[0]->has_volatiles)
1831                                 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1832                 }
1833                 fh = NULL;
1834         }
1835         if (changed || ch_flags) {
1836                 /* If a control was changed that was not one of the controls
1837                    modified by the application, then send the event to all. */
1838                 if (!ctrl->is_new)
1839                         fh = NULL;
1840                 send_event(fh, ctrl,
1841                         (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
1842                 if (ctrl->call_notify && changed && ctrl->handler->notify)
1843                         ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
1844         }
1845 }
1846
1847 /* Copy the current value to the new value */
1848 static void cur_to_new(struct v4l2_ctrl *ctrl)
1849 {
1850         if (ctrl == NULL)
1851                 return;
1852         ptr_to_ptr(ctrl, ctrl->p_cur, ctrl->p_new);
1853 }
1854
1855 /* Copy the new value to the request value */
1856 static void new_to_req(struct v4l2_ctrl_ref *ref)
1857 {
1858         if (!ref)
1859                 return;
1860         ptr_to_ptr(ref->ctrl, ref->ctrl->p_new, ref->p_req);
1861         ref->req = ref;
1862 }
1863
1864 /* Copy the request value to the new value */
1865 static void req_to_new(struct v4l2_ctrl_ref *ref)
1866 {
1867         if (!ref)
1868                 return;
1869         if (ref->req)
1870                 ptr_to_ptr(ref->ctrl, ref->req->p_req, ref->ctrl->p_new);
1871         else
1872                 ptr_to_ptr(ref->ctrl, ref->ctrl->p_cur, ref->ctrl->p_new);
1873 }
1874
1875 /* Return non-zero if one or more of the controls in the cluster has a new
1876    value that differs from the current value. */
1877 static int cluster_changed(struct v4l2_ctrl *master)
1878 {
1879         bool changed = false;
1880         unsigned idx;
1881         int i;
1882
1883         for (i = 0; i < master->ncontrols; i++) {
1884                 struct v4l2_ctrl *ctrl = master->cluster[i];
1885                 bool ctrl_changed = false;
1886
1887                 if (ctrl == NULL)
1888                         continue;
1889
1890                 if (ctrl->flags & V4L2_CTRL_FLAG_EXECUTE_ON_WRITE)
1891                         changed = ctrl_changed = true;
1892
1893                 /*
1894                  * Set has_changed to false to avoid generating
1895                  * the event V4L2_EVENT_CTRL_CH_VALUE
1896                  */
1897                 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
1898                         ctrl->has_changed = false;
1899                         continue;
1900                 }
1901
1902                 for (idx = 0; !ctrl_changed && idx < ctrl->elems; idx++)
1903                         ctrl_changed = !ctrl->type_ops->equal(ctrl, idx,
1904                                 ctrl->p_cur, ctrl->p_new);
1905                 ctrl->has_changed = ctrl_changed;
1906                 changed |= ctrl->has_changed;
1907         }
1908         return changed;
1909 }
1910
1911 /* Control range checking */
1912 static int check_range(enum v4l2_ctrl_type type,
1913                 s64 min, s64 max, u64 step, s64 def)
1914 {
1915         switch (type) {
1916         case V4L2_CTRL_TYPE_BOOLEAN:
1917                 if (step != 1 || max > 1 || min < 0)
1918                         return -ERANGE;
1919                 /* fall through */
1920         case V4L2_CTRL_TYPE_U8:
1921         case V4L2_CTRL_TYPE_U16:
1922         case V4L2_CTRL_TYPE_U32:
1923         case V4L2_CTRL_TYPE_INTEGER:
1924         case V4L2_CTRL_TYPE_INTEGER64:
1925                 if (step == 0 || min > max || def < min || def > max)
1926                         return -ERANGE;
1927                 return 0;
1928         case V4L2_CTRL_TYPE_BITMASK:
1929                 if (step || min || !max || (def & ~max))
1930                         return -ERANGE;
1931                 return 0;
1932         case V4L2_CTRL_TYPE_MENU:
1933         case V4L2_CTRL_TYPE_INTEGER_MENU:
1934                 if (min > max || def < min || def > max)
1935                         return -ERANGE;
1936                 /* Note: step == menu_skip_mask for menu controls.
1937                    So here we check if the default value is masked out. */
1938                 if (step && ((1 << def) & step))
1939                         return -EINVAL;
1940                 return 0;
1941         case V4L2_CTRL_TYPE_STRING:
1942                 if (min > max || min < 0 || step < 1 || def)
1943                         return -ERANGE;
1944                 return 0;
1945         default:
1946                 return 0;
1947         }
1948 }
1949
1950 /* Validate a new control */
1951 static int validate_new(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr p_new)
1952 {
1953         unsigned idx;
1954         int err = 0;
1955
1956         for (idx = 0; !err && idx < ctrl->elems; idx++)
1957                 err = ctrl->type_ops->validate(ctrl, idx, p_new);
1958         return err;
1959 }
1960
1961 static inline u32 node2id(struct list_head *node)
1962 {
1963         return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1964 }
1965
1966 /* Set the handler's error code if it wasn't set earlier already */
1967 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1968 {
1969         if (hdl->error == 0)
1970                 hdl->error = err;
1971         return err;
1972 }
1973
1974 /* Initialize the handler */
1975 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
1976                                  unsigned nr_of_controls_hint,
1977                                  struct lock_class_key *key, const char *name)
1978 {
1979         mutex_init(&hdl->_lock);
1980         hdl->lock = &hdl->_lock;
1981         lockdep_set_class_and_name(hdl->lock, key, name);
1982         INIT_LIST_HEAD(&hdl->ctrls);
1983         INIT_LIST_HEAD(&hdl->ctrl_refs);
1984         INIT_LIST_HEAD(&hdl->requests);
1985         INIT_LIST_HEAD(&hdl->requests_queued);
1986         hdl->request_is_queued = false;
1987         hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1988         hdl->buckets = kvmalloc_array(hdl->nr_of_buckets,
1989                                       sizeof(hdl->buckets[0]),
1990                                       GFP_KERNEL | __GFP_ZERO);
1991         hdl->error = hdl->buckets ? 0 : -ENOMEM;
1992         media_request_object_init(&hdl->req_obj);
1993         return hdl->error;
1994 }
1995 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
1996
1997 /* Free all controls and control refs */
1998 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1999 {
2000         struct v4l2_ctrl_ref *ref, *next_ref;
2001         struct v4l2_ctrl *ctrl, *next_ctrl;
2002         struct v4l2_subscribed_event *sev, *next_sev;
2003
2004         if (hdl == NULL || hdl->buckets == NULL)
2005                 return;
2006
2007         if (!hdl->req_obj.req && !list_empty(&hdl->requests)) {
2008                 struct v4l2_ctrl_handler *req, *next_req;
2009
2010                 list_for_each_entry_safe(req, next_req, &hdl->requests, requests) {
2011                         media_request_object_unbind(&req->req_obj);
2012                         media_request_object_put(&req->req_obj);
2013                 }
2014         }
2015         mutex_lock(hdl->lock);
2016         /* Free all nodes */
2017         list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
2018                 list_del(&ref->node);
2019                 kfree(ref);
2020         }
2021         /* Free all controls owned by the handler */
2022         list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
2023                 list_del(&ctrl->node);
2024                 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
2025                         list_del(&sev->node);
2026                 kvfree(ctrl);
2027         }
2028         kvfree(hdl->buckets);
2029         hdl->buckets = NULL;
2030         hdl->cached = NULL;
2031         hdl->error = 0;
2032         mutex_unlock(hdl->lock);
2033         mutex_destroy(&hdl->_lock);
2034 }
2035 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
2036
2037 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
2038    be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
2039    with applications that do not use the NEXT_CTRL flag.
2040
2041    We just find the n-th private user control. It's O(N), but that should not
2042    be an issue in this particular case. */
2043 static struct v4l2_ctrl_ref *find_private_ref(
2044                 struct v4l2_ctrl_handler *hdl, u32 id)
2045 {
2046         struct v4l2_ctrl_ref *ref;
2047
2048         id -= V4L2_CID_PRIVATE_BASE;
2049         list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2050                 /* Search for private user controls that are compatible with
2051                    VIDIOC_G/S_CTRL. */
2052                 if (V4L2_CTRL_ID2WHICH(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
2053                     V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
2054                         if (!ref->ctrl->is_int)
2055                                 continue;
2056                         if (id == 0)
2057                                 return ref;
2058                         id--;
2059                 }
2060         }
2061         return NULL;
2062 }
2063
2064 /* Find a control with the given ID. */
2065 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
2066 {
2067         struct v4l2_ctrl_ref *ref;
2068         int bucket;
2069
2070         id &= V4L2_CTRL_ID_MASK;
2071
2072         /* Old-style private controls need special handling */
2073         if (id >= V4L2_CID_PRIVATE_BASE)
2074                 return find_private_ref(hdl, id);
2075         bucket = id % hdl->nr_of_buckets;
2076
2077         /* Simple optimization: cache the last control found */
2078         if (hdl->cached && hdl->cached->ctrl->id == id)
2079                 return hdl->cached;
2080
2081         /* Not in cache, search the hash */
2082         ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
2083         while (ref && ref->ctrl->id != id)
2084                 ref = ref->next;
2085
2086         if (ref)
2087                 hdl->cached = ref; /* cache it! */
2088         return ref;
2089 }
2090
2091 /* Find a control with the given ID. Take the handler's lock first. */
2092 static struct v4l2_ctrl_ref *find_ref_lock(
2093                 struct v4l2_ctrl_handler *hdl, u32 id)
2094 {
2095         struct v4l2_ctrl_ref *ref = NULL;
2096
2097         if (hdl) {
2098                 mutex_lock(hdl->lock);
2099                 ref = find_ref(hdl, id);
2100                 mutex_unlock(hdl->lock);
2101         }
2102         return ref;
2103 }
2104
2105 /* Find a control with the given ID. */
2106 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
2107 {
2108         struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
2109
2110         return ref ? ref->ctrl : NULL;
2111 }
2112 EXPORT_SYMBOL(v4l2_ctrl_find);
2113
2114 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
2115 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
2116                            struct v4l2_ctrl *ctrl,
2117                            struct v4l2_ctrl_ref **ctrl_ref,
2118                            bool from_other_dev, bool allocate_req)
2119 {
2120         struct v4l2_ctrl_ref *ref;
2121         struct v4l2_ctrl_ref *new_ref;
2122         u32 id = ctrl->id;
2123         u32 class_ctrl = V4L2_CTRL_ID2WHICH(id) | 1;
2124         int bucket = id % hdl->nr_of_buckets;   /* which bucket to use */
2125         unsigned int size_extra_req = 0;
2126
2127         if (ctrl_ref)
2128                 *ctrl_ref = NULL;
2129
2130         /*
2131          * Automatically add the control class if it is not yet present and
2132          * the new control is not a compound control.
2133          */
2134         if (ctrl->type < V4L2_CTRL_COMPOUND_TYPES &&
2135             id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
2136                 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
2137                         return hdl->error;
2138
2139         if (hdl->error)
2140                 return hdl->error;
2141
2142         if (allocate_req)
2143                 size_extra_req = ctrl->elems * ctrl->elem_size;
2144         new_ref = kzalloc(sizeof(*new_ref) + size_extra_req, GFP_KERNEL);
2145         if (!new_ref)
2146                 return handler_set_err(hdl, -ENOMEM);
2147         new_ref->ctrl = ctrl;
2148         new_ref->from_other_dev = from_other_dev;
2149         if (size_extra_req)
2150                 new_ref->p_req.p = &new_ref[1];
2151
2152         if (ctrl->handler == hdl) {
2153                 /* By default each control starts in a cluster of its own.
2154                    new_ref->ctrl is basically a cluster array with one
2155                    element, so that's perfect to use as the cluster pointer.
2156                    But only do this for the handler that owns the control. */
2157                 ctrl->cluster = &new_ref->ctrl;
2158                 ctrl->ncontrols = 1;
2159         }
2160
2161         INIT_LIST_HEAD(&new_ref->node);
2162
2163         mutex_lock(hdl->lock);
2164
2165         /* Add immediately at the end of the list if the list is empty, or if
2166            the last element in the list has a lower ID.
2167            This ensures that when elements are added in ascending order the
2168            insertion is an O(1) operation. */
2169         if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
2170                 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
2171                 goto insert_in_hash;
2172         }
2173
2174         /* Find insert position in sorted list */
2175         list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2176                 if (ref->ctrl->id < id)
2177                         continue;
2178                 /* Don't add duplicates */
2179                 if (ref->ctrl->id == id) {
2180                         kfree(new_ref);
2181                         goto unlock;
2182                 }
2183                 list_add(&new_ref->node, ref->node.prev);
2184                 break;
2185         }
2186
2187 insert_in_hash:
2188         /* Insert the control node in the hash */
2189         new_ref->next = hdl->buckets[bucket];
2190         hdl->buckets[bucket] = new_ref;
2191         if (ctrl_ref)
2192                 *ctrl_ref = new_ref;
2193
2194 unlock:
2195         mutex_unlock(hdl->lock);
2196         return 0;
2197 }
2198
2199 /* Add a new control */
2200 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
2201                         const struct v4l2_ctrl_ops *ops,
2202                         const struct v4l2_ctrl_type_ops *type_ops,
2203                         u32 id, const char *name, enum v4l2_ctrl_type type,
2204                         s64 min, s64 max, u64 step, s64 def,
2205                         const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size,
2206                         u32 flags, const char * const *qmenu,
2207                         const s64 *qmenu_int, void *priv)
2208 {
2209         struct v4l2_ctrl *ctrl;
2210         unsigned sz_extra;
2211         unsigned nr_of_dims = 0;
2212         unsigned elems = 1;
2213         bool is_array;
2214         unsigned tot_ctrl_size;
2215         unsigned idx;
2216         void *data;
2217         int err;
2218
2219         if (hdl->error)
2220                 return NULL;
2221
2222         while (dims && dims[nr_of_dims]) {
2223                 elems *= dims[nr_of_dims];
2224                 nr_of_dims++;
2225                 if (nr_of_dims == V4L2_CTRL_MAX_DIMS)
2226                         break;
2227         }
2228         is_array = nr_of_dims > 0;
2229
2230         /* Prefill elem_size for all types handled by std_type_ops */
2231         switch ((u32)type) {
2232         case V4L2_CTRL_TYPE_INTEGER64:
2233                 elem_size = sizeof(s64);
2234                 break;
2235         case V4L2_CTRL_TYPE_STRING:
2236                 elem_size = max + 1;
2237                 break;
2238         case V4L2_CTRL_TYPE_U8:
2239                 elem_size = sizeof(u8);
2240                 break;
2241         case V4L2_CTRL_TYPE_U16:
2242                 elem_size = sizeof(u16);
2243                 break;
2244         case V4L2_CTRL_TYPE_U32:
2245                 elem_size = sizeof(u32);
2246                 break;
2247         case V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS:
2248                 elem_size = sizeof(struct v4l2_ctrl_mpeg2_slice_params);
2249                 break;
2250         case V4L2_CTRL_TYPE_MPEG2_QUANTIZATION:
2251                 elem_size = sizeof(struct v4l2_ctrl_mpeg2_quantization);
2252                 break;
2253         case V4L2_CTRL_TYPE_FWHT_PARAMS:
2254                 elem_size = sizeof(struct v4l2_ctrl_fwht_params);
2255                 break;
2256         default:
2257                 if (type < V4L2_CTRL_COMPOUND_TYPES)
2258                         elem_size = sizeof(s32);
2259                 break;
2260         }
2261         tot_ctrl_size = elem_size * elems;
2262
2263         /* Sanity checks */
2264         if (id == 0 || name == NULL || !elem_size ||
2265             id >= V4L2_CID_PRIVATE_BASE ||
2266             (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
2267             (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
2268                 handler_set_err(hdl, -ERANGE);
2269                 return NULL;
2270         }
2271         err = check_range(type, min, max, step, def);
2272         if (err) {
2273                 handler_set_err(hdl, err);
2274                 return NULL;
2275         }
2276         if (is_array &&
2277             (type == V4L2_CTRL_TYPE_BUTTON ||
2278              type == V4L2_CTRL_TYPE_CTRL_CLASS)) {
2279                 handler_set_err(hdl, -EINVAL);
2280                 return NULL;
2281         }
2282
2283         sz_extra = 0;
2284         if (type == V4L2_CTRL_TYPE_BUTTON)
2285                 flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
2286                         V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
2287         else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
2288                 flags |= V4L2_CTRL_FLAG_READ_ONLY;
2289         else if (type == V4L2_CTRL_TYPE_INTEGER64 ||
2290                  type == V4L2_CTRL_TYPE_STRING ||
2291                  type >= V4L2_CTRL_COMPOUND_TYPES ||
2292                  is_array)
2293                 sz_extra += 2 * tot_ctrl_size;
2294
2295         ctrl = kvzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
2296         if (ctrl == NULL) {
2297                 handler_set_err(hdl, -ENOMEM);
2298                 return NULL;
2299         }
2300
2301         INIT_LIST_HEAD(&ctrl->node);
2302         INIT_LIST_HEAD(&ctrl->ev_subs);
2303         ctrl->handler = hdl;
2304         ctrl->ops = ops;
2305         ctrl->type_ops = type_ops ? type_ops : &std_type_ops;
2306         ctrl->id = id;
2307         ctrl->name = name;
2308         ctrl->type = type;
2309         ctrl->flags = flags;
2310         ctrl->minimum = min;
2311         ctrl->maximum = max;
2312         ctrl->step = step;
2313         ctrl->default_value = def;
2314         ctrl->is_string = !is_array && type == V4L2_CTRL_TYPE_STRING;
2315         ctrl->is_ptr = is_array || type >= V4L2_CTRL_COMPOUND_TYPES || ctrl->is_string;
2316         ctrl->is_int = !ctrl->is_ptr && type != V4L2_CTRL_TYPE_INTEGER64;
2317         ctrl->is_array = is_array;
2318         ctrl->elems = elems;
2319         ctrl->nr_of_dims = nr_of_dims;
2320         if (nr_of_dims)
2321                 memcpy(ctrl->dims, dims, nr_of_dims * sizeof(dims[0]));
2322         ctrl->elem_size = elem_size;
2323         if (type == V4L2_CTRL_TYPE_MENU)
2324                 ctrl->qmenu = qmenu;
2325         else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2326                 ctrl->qmenu_int = qmenu_int;
2327         ctrl->priv = priv;
2328         ctrl->cur.val = ctrl->val = def;
2329         data = &ctrl[1];
2330
2331         if (!ctrl->is_int) {
2332                 ctrl->p_new.p = data;
2333                 ctrl->p_cur.p = data + tot_ctrl_size;
2334         } else {
2335                 ctrl->p_new.p = &ctrl->val;
2336                 ctrl->p_cur.p = &ctrl->cur.val;
2337         }
2338         for (idx = 0; idx < elems; idx++) {
2339                 ctrl->type_ops->init(ctrl, idx, ctrl->p_cur);
2340                 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2341         }
2342
2343         if (handler_new_ref(hdl, ctrl, NULL, false, false)) {
2344                 kvfree(ctrl);
2345                 return NULL;
2346         }
2347         mutex_lock(hdl->lock);
2348         list_add_tail(&ctrl->node, &hdl->ctrls);
2349         mutex_unlock(hdl->lock);
2350         return ctrl;
2351 }
2352
2353 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
2354                         const struct v4l2_ctrl_config *cfg, void *priv)
2355 {
2356         bool is_menu;
2357         struct v4l2_ctrl *ctrl;
2358         const char *name = cfg->name;
2359         const char * const *qmenu = cfg->qmenu;
2360         const s64 *qmenu_int = cfg->qmenu_int;
2361         enum v4l2_ctrl_type type = cfg->type;
2362         u32 flags = cfg->flags;
2363         s64 min = cfg->min;
2364         s64 max = cfg->max;
2365         u64 step = cfg->step;
2366         s64 def = cfg->def;
2367
2368         if (name == NULL)
2369                 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
2370                                                                 &def, &flags);
2371
2372         is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU ||
2373                    cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU);
2374         if (is_menu)
2375                 WARN_ON(step);
2376         else
2377                 WARN_ON(cfg->menu_skip_mask);
2378         if (cfg->type == V4L2_CTRL_TYPE_MENU && qmenu == NULL)
2379                 qmenu = v4l2_ctrl_get_menu(cfg->id);
2380         else if (cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU &&
2381                  qmenu_int == NULL) {
2382                 handler_set_err(hdl, -EINVAL);
2383                 return NULL;
2384         }
2385
2386         ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->type_ops, cfg->id, name,
2387                         type, min, max,
2388                         is_menu ? cfg->menu_skip_mask : step, def,
2389                         cfg->dims, cfg->elem_size,
2390                         flags, qmenu, qmenu_int, priv);
2391         if (ctrl)
2392                 ctrl->is_private = cfg->is_private;
2393         return ctrl;
2394 }
2395 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
2396
2397 /* Helper function for standard non-menu controls */
2398 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
2399                         const struct v4l2_ctrl_ops *ops,
2400                         u32 id, s64 min, s64 max, u64 step, s64 def)
2401 {
2402         const char *name;
2403         enum v4l2_ctrl_type type;
2404         u32 flags;
2405
2406         v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2407         if (type == V4L2_CTRL_TYPE_MENU ||
2408             type == V4L2_CTRL_TYPE_INTEGER_MENU ||
2409             type >= V4L2_CTRL_COMPOUND_TYPES) {
2410                 handler_set_err(hdl, -EINVAL);
2411                 return NULL;
2412         }
2413         return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2414                              min, max, step, def, NULL, 0,
2415                              flags, NULL, NULL, NULL);
2416 }
2417 EXPORT_SYMBOL(v4l2_ctrl_new_std);
2418
2419 /* Helper function for standard menu controls */
2420 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
2421                         const struct v4l2_ctrl_ops *ops,
2422                         u32 id, u8 _max, u64 mask, u8 _def)
2423 {
2424         const char * const *qmenu = NULL;
2425         const s64 *qmenu_int = NULL;
2426         unsigned int qmenu_int_len = 0;
2427         const char *name;
2428         enum v4l2_ctrl_type type;
2429         s64 min;
2430         s64 max = _max;
2431         s64 def = _def;
2432         u64 step;
2433         u32 flags;
2434
2435         v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2436
2437         if (type == V4L2_CTRL_TYPE_MENU)
2438                 qmenu = v4l2_ctrl_get_menu(id);
2439         else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2440                 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
2441
2442         if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
2443                 handler_set_err(hdl, -EINVAL);
2444                 return NULL;
2445         }
2446         return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2447                              0, max, mask, def, NULL, 0,
2448                              flags, qmenu, qmenu_int, NULL);
2449 }
2450 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
2451
2452 /* Helper function for standard menu controls with driver defined menu */
2453 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
2454                         const struct v4l2_ctrl_ops *ops, u32 id, u8 _max,
2455                         u64 mask, u8 _def, const char * const *qmenu)
2456 {
2457         enum v4l2_ctrl_type type;
2458         const char *name;
2459         u32 flags;
2460         u64 step;
2461         s64 min;
2462         s64 max = _max;
2463         s64 def = _def;
2464
2465         /* v4l2_ctrl_new_std_menu_items() should only be called for
2466          * standard controls without a standard menu.
2467          */
2468         if (v4l2_ctrl_get_menu(id)) {
2469                 handler_set_err(hdl, -EINVAL);
2470                 return NULL;
2471         }
2472
2473         v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2474         if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
2475                 handler_set_err(hdl, -EINVAL);
2476                 return NULL;
2477         }
2478         return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2479                              0, max, mask, def, NULL, 0,
2480                              flags, qmenu, NULL, NULL);
2481
2482 }
2483 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
2484
2485 /* Helper function for standard integer menu controls */
2486 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
2487                         const struct v4l2_ctrl_ops *ops,
2488                         u32 id, u8 _max, u8 _def, const s64 *qmenu_int)
2489 {
2490         const char *name;
2491         enum v4l2_ctrl_type type;
2492         s64 min;
2493         u64 step;
2494         s64 max = _max;
2495         s64 def = _def;
2496         u32 flags;
2497
2498         v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2499         if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
2500                 handler_set_err(hdl, -EINVAL);
2501                 return NULL;
2502         }
2503         return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2504                              0, max, 0, def, NULL, 0,
2505                              flags, NULL, qmenu_int, NULL);
2506 }
2507 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
2508
2509 /* Add the controls from another handler to our own. */
2510 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
2511                           struct v4l2_ctrl_handler *add,
2512                           bool (*filter)(const struct v4l2_ctrl *ctrl),
2513                           bool from_other_dev)
2514 {
2515         struct v4l2_ctrl_ref *ref;
2516         int ret = 0;
2517
2518         /* Do nothing if either handler is NULL or if they are the same */
2519         if (!hdl || !add || hdl == add)
2520                 return 0;
2521         if (hdl->error)
2522                 return hdl->error;
2523         mutex_lock(add->lock);
2524         list_for_each_entry(ref, &add->ctrl_refs, node) {
2525                 struct v4l2_ctrl *ctrl = ref->ctrl;
2526
2527                 /* Skip handler-private controls. */
2528                 if (ctrl->is_private)
2529                         continue;
2530                 /* And control classes */
2531                 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2532                         continue;
2533                 /* Filter any unwanted controls */
2534                 if (filter && !filter(ctrl))
2535                         continue;
2536                 ret = handler_new_ref(hdl, ctrl, NULL, from_other_dev, false);
2537                 if (ret)
2538                         break;
2539         }
2540         mutex_unlock(add->lock);
2541         return ret;
2542 }
2543 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
2544
2545 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
2546 {
2547         if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
2548                 return true;
2549         if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
2550                 return true;
2551         switch (ctrl->id) {
2552         case V4L2_CID_AUDIO_MUTE:
2553         case V4L2_CID_AUDIO_VOLUME:
2554         case V4L2_CID_AUDIO_BALANCE:
2555         case V4L2_CID_AUDIO_BASS:
2556         case V4L2_CID_AUDIO_TREBLE:
2557         case V4L2_CID_AUDIO_LOUDNESS:
2558                 return true;
2559         default:
2560                 break;
2561         }
2562         return false;
2563 }
2564 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
2565
2566 /* Cluster controls */
2567 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
2568 {
2569         bool has_volatiles = false;
2570         int i;
2571
2572         /* The first control is the master control and it must not be NULL */
2573         if (WARN_ON(ncontrols == 0 || controls[0] == NULL))
2574                 return;
2575
2576         for (i = 0; i < ncontrols; i++) {
2577                 if (controls[i]) {
2578                         controls[i]->cluster = controls;
2579                         controls[i]->ncontrols = ncontrols;
2580                         if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
2581                                 has_volatiles = true;
2582                 }
2583         }
2584         controls[0]->has_volatiles = has_volatiles;
2585 }
2586 EXPORT_SYMBOL(v4l2_ctrl_cluster);
2587
2588 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
2589                             u8 manual_val, bool set_volatile)
2590 {
2591         struct v4l2_ctrl *master = controls[0];
2592         u32 flag = 0;
2593         int i;
2594
2595         v4l2_ctrl_cluster(ncontrols, controls);
2596         WARN_ON(ncontrols <= 1);
2597         WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
2598         WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
2599         master->is_auto = true;
2600         master->has_volatiles = set_volatile;
2601         master->manual_mode_value = manual_val;
2602         master->flags |= V4L2_CTRL_FLAG_UPDATE;
2603
2604         if (!is_cur_manual(master))
2605                 flag = V4L2_CTRL_FLAG_INACTIVE |
2606                         (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
2607
2608         for (i = 1; i < ncontrols; i++)
2609                 if (controls[i])
2610                         controls[i]->flags |= flag;
2611 }
2612 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
2613
2614 /* Activate/deactivate a control. */
2615 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
2616 {
2617         /* invert since the actual flag is called 'inactive' */
2618         bool inactive = !active;
2619         bool old;
2620
2621         if (ctrl == NULL)
2622                 return;
2623
2624         if (inactive)
2625                 /* set V4L2_CTRL_FLAG_INACTIVE */
2626                 old = test_and_set_bit(4, &ctrl->flags);
2627         else
2628                 /* clear V4L2_CTRL_FLAG_INACTIVE */
2629                 old = test_and_clear_bit(4, &ctrl->flags);
2630         if (old != inactive)
2631                 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2632 }
2633 EXPORT_SYMBOL(v4l2_ctrl_activate);
2634
2635 void __v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
2636 {
2637         bool old;
2638
2639         if (ctrl == NULL)
2640                 return;
2641
2642         lockdep_assert_held(ctrl->handler->lock);
2643
2644         if (grabbed)
2645                 /* set V4L2_CTRL_FLAG_GRABBED */
2646                 old = test_and_set_bit(1, &ctrl->flags);
2647         else
2648                 /* clear V4L2_CTRL_FLAG_GRABBED */
2649                 old = test_and_clear_bit(1, &ctrl->flags);
2650         if (old != grabbed)
2651                 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2652 }
2653 EXPORT_SYMBOL(__v4l2_ctrl_grab);
2654
2655 /* Log the control name and value */
2656 static void log_ctrl(const struct v4l2_ctrl *ctrl,
2657                      const char *prefix, const char *colon)
2658 {
2659         if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
2660                 return;
2661         if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2662                 return;
2663
2664         pr_info("%s%s%s: ", prefix, colon, ctrl->name);
2665
2666         ctrl->type_ops->log(ctrl);
2667
2668         if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
2669                            V4L2_CTRL_FLAG_GRABBED |
2670                            V4L2_CTRL_FLAG_VOLATILE)) {
2671                 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
2672                         pr_cont(" inactive");
2673                 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
2674                         pr_cont(" grabbed");
2675                 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
2676                         pr_cont(" volatile");
2677         }
2678         pr_cont("\n");
2679 }
2680
2681 /* Log all controls owned by the handler */
2682 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
2683                                   const char *prefix)
2684 {
2685         struct v4l2_ctrl *ctrl;
2686         const char *colon = "";
2687         int len;
2688
2689         if (hdl == NULL)
2690                 return;
2691         if (prefix == NULL)
2692                 prefix = "";
2693         len = strlen(prefix);
2694         if (len && prefix[len - 1] != ' ')
2695                 colon = ": ";
2696         mutex_lock(hdl->lock);
2697         list_for_each_entry(ctrl, &hdl->ctrls, node)
2698                 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
2699                         log_ctrl(ctrl, prefix, colon);
2700         mutex_unlock(hdl->lock);
2701 }
2702 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
2703
2704 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
2705 {
2706         v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
2707         return 0;
2708 }
2709 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
2710
2711 /* Call s_ctrl for all controls owned by the handler */
2712 int __v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2713 {
2714         struct v4l2_ctrl *ctrl;
2715         int ret = 0;
2716
2717         if (hdl == NULL)
2718                 return 0;
2719
2720         lockdep_assert_held(hdl->lock);
2721
2722         list_for_each_entry(ctrl, &hdl->ctrls, node)
2723                 ctrl->done = false;
2724
2725         list_for_each_entry(ctrl, &hdl->ctrls, node) {
2726                 struct v4l2_ctrl *master = ctrl->cluster[0];
2727                 int i;
2728
2729                 /* Skip if this control was already handled by a cluster. */
2730                 /* Skip button controls and read-only controls. */
2731                 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
2732                     (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
2733                         continue;
2734
2735                 for (i = 0; i < master->ncontrols; i++) {
2736                         if (master->cluster[i]) {
2737                                 cur_to_new(master->cluster[i]);
2738                                 master->cluster[i]->is_new = 1;
2739                                 master->cluster[i]->done = true;
2740                         }
2741                 }
2742                 ret = call_op(master, s_ctrl);
2743                 if (ret)
2744                         break;
2745         }
2746
2747         return ret;
2748 }
2749 EXPORT_SYMBOL_GPL(__v4l2_ctrl_handler_setup);
2750
2751 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2752 {
2753         int ret;
2754
2755         if (hdl == NULL)
2756                 return 0;
2757
2758         mutex_lock(hdl->lock);
2759         ret = __v4l2_ctrl_handler_setup(hdl);
2760         mutex_unlock(hdl->lock);
2761
2762         return ret;
2763 }
2764 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
2765
2766 /* Implement VIDIOC_QUERY_EXT_CTRL */
2767 int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc)
2768 {
2769         const unsigned next_flags = V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
2770         u32 id = qc->id & V4L2_CTRL_ID_MASK;
2771         struct v4l2_ctrl_ref *ref;
2772         struct v4l2_ctrl *ctrl;
2773
2774         if (hdl == NULL)
2775                 return -EINVAL;
2776
2777         mutex_lock(hdl->lock);
2778
2779         /* Try to find it */
2780         ref = find_ref(hdl, id);
2781
2782         if ((qc->id & next_flags) && !list_empty(&hdl->ctrl_refs)) {
2783                 bool is_compound;
2784                 /* Match any control that is not hidden */
2785                 unsigned mask = 1;
2786                 bool match = false;
2787
2788                 if ((qc->id & next_flags) == V4L2_CTRL_FLAG_NEXT_COMPOUND) {
2789                         /* Match any hidden control */
2790                         match = true;
2791                 } else if ((qc->id & next_flags) == next_flags) {
2792                         /* Match any control, compound or not */
2793                         mask = 0;
2794                 }
2795
2796                 /* Find the next control with ID > qc->id */
2797
2798                 /* Did we reach the end of the control list? */
2799                 if (id >= node2id(hdl->ctrl_refs.prev)) {
2800                         ref = NULL; /* Yes, so there is no next control */
2801                 } else if (ref) {
2802                         /* We found a control with the given ID, so just get
2803                            the next valid one in the list. */
2804                         list_for_each_entry_continue(ref, &hdl->ctrl_refs, node) {
2805                                 is_compound = ref->ctrl->is_array ||
2806                                         ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2807                                 if (id < ref->ctrl->id &&
2808                                     (is_compound & mask) == match)
2809                                         break;
2810                         }
2811                         if (&ref->node == &hdl->ctrl_refs)
2812                                 ref = NULL;
2813                 } else {
2814                         /* No control with the given ID exists, so start
2815                            searching for the next largest ID. We know there
2816                            is one, otherwise the first 'if' above would have
2817                            been true. */
2818                         list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2819                                 is_compound = ref->ctrl->is_array ||
2820                                         ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2821                                 if (id < ref->ctrl->id &&
2822                                     (is_compound & mask) == match)
2823                                         break;
2824                         }
2825                         if (&ref->node == &hdl->ctrl_refs)
2826                                 ref = NULL;
2827                 }
2828         }
2829         mutex_unlock(hdl->lock);
2830
2831         if (!ref)
2832                 return -EINVAL;
2833
2834         ctrl = ref->ctrl;
2835         memset(qc, 0, sizeof(*qc));
2836         if (id >= V4L2_CID_PRIVATE_BASE)
2837                 qc->id = id;
2838         else
2839                 qc->id = ctrl->id;
2840         strscpy(qc->name, ctrl->name, sizeof(qc->name));
2841         qc->flags = user_flags(ctrl);
2842         qc->type = ctrl->type;
2843         qc->elem_size = ctrl->elem_size;
2844         qc->elems = ctrl->elems;
2845         qc->nr_of_dims = ctrl->nr_of_dims;
2846         memcpy(qc->dims, ctrl->dims, qc->nr_of_dims * sizeof(qc->dims[0]));
2847         qc->minimum = ctrl->minimum;
2848         qc->maximum = ctrl->maximum;
2849         qc->default_value = ctrl->default_value;
2850         if (ctrl->type == V4L2_CTRL_TYPE_MENU
2851             || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
2852                 qc->step = 1;
2853         else
2854                 qc->step = ctrl->step;
2855         return 0;
2856 }
2857 EXPORT_SYMBOL(v4l2_query_ext_ctrl);
2858
2859 /* Implement VIDIOC_QUERYCTRL */
2860 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
2861 {
2862         struct v4l2_query_ext_ctrl qec = { qc->id };
2863         int rc;
2864
2865         rc = v4l2_query_ext_ctrl(hdl, &qec);
2866         if (rc)
2867                 return rc;
2868
2869         qc->id = qec.id;
2870         qc->type = qec.type;
2871         qc->flags = qec.flags;
2872         strscpy(qc->name, qec.name, sizeof(qc->name));
2873         switch (qc->type) {
2874         case V4L2_CTRL_TYPE_INTEGER:
2875         case V4L2_CTRL_TYPE_BOOLEAN:
2876         case V4L2_CTRL_TYPE_MENU:
2877         case V4L2_CTRL_TYPE_INTEGER_MENU:
2878         case V4L2_CTRL_TYPE_STRING:
2879         case V4L2_CTRL_TYPE_BITMASK:
2880                 qc->minimum = qec.minimum;
2881                 qc->maximum = qec.maximum;
2882                 qc->step = qec.step;
2883                 qc->default_value = qec.default_value;
2884                 break;
2885         default:
2886                 qc->minimum = 0;
2887                 qc->maximum = 0;
2888                 qc->step = 0;
2889                 qc->default_value = 0;
2890                 break;
2891         }
2892         return 0;
2893 }
2894 EXPORT_SYMBOL(v4l2_queryctrl);
2895
2896 /* Implement VIDIOC_QUERYMENU */
2897 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2898 {
2899         struct v4l2_ctrl *ctrl;
2900         u32 i = qm->index;
2901
2902         ctrl = v4l2_ctrl_find(hdl, qm->id);
2903         if (!ctrl)
2904                 return -EINVAL;
2905
2906         qm->reserved = 0;
2907         /* Sanity checks */
2908         switch (ctrl->type) {
2909         case V4L2_CTRL_TYPE_MENU:
2910                 if (ctrl->qmenu == NULL)
2911                         return -EINVAL;
2912                 break;
2913         case V4L2_CTRL_TYPE_INTEGER_MENU:
2914                 if (ctrl->qmenu_int == NULL)
2915                         return -EINVAL;
2916                 break;
2917         default:
2918                 return -EINVAL;
2919         }
2920
2921         if (i < ctrl->minimum || i > ctrl->maximum)
2922                 return -EINVAL;
2923
2924         /* Use mask to see if this menu item should be skipped */
2925         if (ctrl->menu_skip_mask & (1ULL << i))
2926                 return -EINVAL;
2927         /* Empty menu items should also be skipped */
2928         if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2929                 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2930                         return -EINVAL;
2931                 strscpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2932         } else {
2933                 qm->value = ctrl->qmenu_int[i];
2934         }
2935         return 0;
2936 }
2937 EXPORT_SYMBOL(v4l2_querymenu);
2938
2939 static int v4l2_ctrl_request_clone(struct v4l2_ctrl_handler *hdl,
2940                                    const struct v4l2_ctrl_handler *from)
2941 {
2942         struct v4l2_ctrl_ref *ref;
2943         int err = 0;
2944
2945         if (WARN_ON(!hdl || hdl == from))
2946                 return -EINVAL;
2947
2948         if (hdl->error)
2949                 return hdl->error;
2950
2951         WARN_ON(hdl->lock != &hdl->_lock);
2952
2953         mutex_lock(from->lock);
2954         list_for_each_entry(ref, &from->ctrl_refs, node) {
2955                 struct v4l2_ctrl *ctrl = ref->ctrl;
2956                 struct v4l2_ctrl_ref *new_ref;
2957
2958                 /* Skip refs inherited from other devices */
2959                 if (ref->from_other_dev)
2960                         continue;
2961                 /* And buttons */
2962                 if (ctrl->type == V4L2_CTRL_TYPE_BUTTON)
2963                         continue;
2964                 err = handler_new_ref(hdl, ctrl, &new_ref, false, true);
2965                 if (err)
2966                         break;
2967         }
2968         mutex_unlock(from->lock);
2969         return err;
2970 }
2971
2972 static void v4l2_ctrl_request_queue(struct media_request_object *obj)
2973 {
2974         struct v4l2_ctrl_handler *hdl =
2975                 container_of(obj, struct v4l2_ctrl_handler, req_obj);
2976         struct v4l2_ctrl_handler *main_hdl = obj->priv;
2977         struct v4l2_ctrl_handler *prev_hdl = NULL;
2978         struct v4l2_ctrl_ref *ref_ctrl, *ref_ctrl_prev = NULL;
2979
2980         if (list_empty(&main_hdl->requests_queued))
2981                 goto queue;
2982
2983         prev_hdl = list_last_entry(&main_hdl->requests_queued,
2984                                    struct v4l2_ctrl_handler, requests_queued);
2985         /*
2986          * Note: prev_hdl and hdl must contain the same list of control
2987          * references, so if any differences are detected then that is a
2988          * driver bug and the WARN_ON is triggered.
2989          */
2990         mutex_lock(prev_hdl->lock);
2991         ref_ctrl_prev = list_first_entry(&prev_hdl->ctrl_refs,
2992                                          struct v4l2_ctrl_ref, node);
2993         list_for_each_entry(ref_ctrl, &hdl->ctrl_refs, node) {
2994                 if (ref_ctrl->req)
2995                         continue;
2996                 while (ref_ctrl_prev->ctrl->id < ref_ctrl->ctrl->id) {
2997                         /* Should never happen, but just in case... */
2998                         if (list_is_last(&ref_ctrl_prev->node,
2999                                          &prev_hdl->ctrl_refs))
3000                                 break;
3001                         ref_ctrl_prev = list_next_entry(ref_ctrl_prev, node);
3002                 }
3003                 if (WARN_ON(ref_ctrl_prev->ctrl->id != ref_ctrl->ctrl->id))
3004                         break;
3005                 ref_ctrl->req = ref_ctrl_prev->req;
3006         }
3007         mutex_unlock(prev_hdl->lock);
3008 queue:
3009         list_add_tail(&hdl->requests_queued, &main_hdl->requests_queued);
3010         hdl->request_is_queued = true;
3011 }
3012
3013 static void v4l2_ctrl_request_unbind(struct media_request_object *obj)
3014 {
3015         struct v4l2_ctrl_handler *hdl =
3016                 container_of(obj, struct v4l2_ctrl_handler, req_obj);
3017
3018         list_del_init(&hdl->requests);
3019         if (hdl->request_is_queued) {
3020                 list_del_init(&hdl->requests_queued);
3021                 hdl->request_is_queued = false;
3022         }
3023 }
3024
3025 static void v4l2_ctrl_request_release(struct media_request_object *obj)
3026 {
3027         struct v4l2_ctrl_handler *hdl =
3028                 container_of(obj, struct v4l2_ctrl_handler, req_obj);
3029
3030         v4l2_ctrl_handler_free(hdl);
3031         kfree(hdl);
3032 }
3033
3034 static const struct media_request_object_ops req_ops = {
3035         .queue = v4l2_ctrl_request_queue,
3036         .unbind = v4l2_ctrl_request_unbind,
3037         .release = v4l2_ctrl_request_release,
3038 };
3039
3040 struct v4l2_ctrl_handler *v4l2_ctrl_request_hdl_find(struct media_request *req,
3041                                         struct v4l2_ctrl_handler *parent)
3042 {
3043         struct media_request_object *obj;
3044
3045         if (WARN_ON(req->state != MEDIA_REQUEST_STATE_VALIDATING &&
3046                     req->state != MEDIA_REQUEST_STATE_QUEUED))
3047                 return NULL;
3048
3049         obj = media_request_object_find(req, &req_ops, parent);
3050         if (obj)
3051                 return container_of(obj, struct v4l2_ctrl_handler, req_obj);
3052         return NULL;
3053 }
3054 EXPORT_SYMBOL_GPL(v4l2_ctrl_request_hdl_find);
3055
3056 struct v4l2_ctrl *
3057 v4l2_ctrl_request_hdl_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
3058 {
3059         struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
3060
3061         return (ref && ref->req == ref) ? ref->ctrl : NULL;
3062 }
3063 EXPORT_SYMBOL_GPL(v4l2_ctrl_request_hdl_ctrl_find);
3064
3065 static int v4l2_ctrl_request_bind(struct media_request *req,
3066                            struct v4l2_ctrl_handler *hdl,
3067                            struct v4l2_ctrl_handler *from)
3068 {
3069         int ret;
3070
3071         ret = v4l2_ctrl_request_clone(hdl, from);
3072
3073         if (!ret) {
3074                 ret = media_request_object_bind(req, &req_ops,
3075                                                 from, false, &hdl->req_obj);
3076                 if (!ret)
3077                         list_add_tail(&hdl->requests, &from->requests);
3078         }
3079         return ret;
3080 }
3081
3082 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
3083
3084    It is not a fully atomic operation, just best-effort only. After all, if
3085    multiple controls have to be set through multiple i2c writes (for example)
3086    then some initial writes may succeed while others fail. Thus leaving the
3087    system in an inconsistent state. The question is how much effort you are
3088    willing to spend on trying to make something atomic that really isn't.
3089
3090    From the point of view of an application the main requirement is that
3091    when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
3092    error should be returned without actually affecting any controls.
3093
3094    If all the values are correct, then it is acceptable to just give up
3095    in case of low-level errors.
3096
3097    It is important though that the application can tell when only a partial
3098    configuration was done. The way we do that is through the error_idx field
3099    of struct v4l2_ext_controls: if that is equal to the count field then no
3100    controls were affected. Otherwise all controls before that index were
3101    successful in performing their 'get' or 'set' operation, the control at
3102    the given index failed, and you don't know what happened with the controls
3103    after the failed one. Since if they were part of a control cluster they
3104    could have been successfully processed (if a cluster member was encountered
3105    at index < error_idx), they could have failed (if a cluster member was at
3106    error_idx), or they may not have been processed yet (if the first cluster
3107    member appeared after error_idx).
3108
3109    It is all fairly theoretical, though. In practice all you can do is to
3110    bail out. If error_idx == count, then it is an application bug. If
3111    error_idx < count then it is only an application bug if the error code was
3112    EBUSY. That usually means that something started streaming just when you
3113    tried to set the controls. In all other cases it is a driver/hardware
3114    problem and all you can do is to retry or bail out.
3115
3116    Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
3117    never modifies controls the error_idx is just set to whatever control
3118    has an invalid value.
3119  */
3120
3121 /* Prepare for the extended g/s/try functions.
3122    Find the controls in the control array and do some basic checks. */
3123 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
3124                              struct v4l2_ext_controls *cs,
3125                              struct v4l2_ctrl_helper *helpers,
3126                              bool get)
3127 {
3128         struct v4l2_ctrl_helper *h;
3129         bool have_clusters = false;
3130         u32 i;
3131
3132         for (i = 0, h = helpers; i < cs->count; i++, h++) {
3133                 struct v4l2_ext_control *c = &cs->controls[i];
3134                 struct v4l2_ctrl_ref *ref;
3135                 struct v4l2_ctrl *ctrl;
3136                 u32 id = c->id & V4L2_CTRL_ID_MASK;
3137
3138                 cs->error_idx = i;
3139
3140                 if (cs->which &&
3141                     cs->which != V4L2_CTRL_WHICH_DEF_VAL &&
3142                     cs->which != V4L2_CTRL_WHICH_REQUEST_VAL &&
3143                     V4L2_CTRL_ID2WHICH(id) != cs->which)
3144                         return -EINVAL;
3145
3146                 /* Old-style private controls are not allowed for
3147                    extended controls */
3148                 if (id >= V4L2_CID_PRIVATE_BASE)
3149                         return -EINVAL;
3150                 ref = find_ref_lock(hdl, id);
3151                 if (ref == NULL)
3152                         return -EINVAL;
3153                 h->ref = ref;
3154                 ctrl = ref->ctrl;
3155                 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
3156                         return -EINVAL;
3157
3158                 if (ctrl->cluster[0]->ncontrols > 1)
3159                         have_clusters = true;
3160                 if (ctrl->cluster[0] != ctrl)
3161                         ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
3162                 if (ctrl->is_ptr && !ctrl->is_string) {
3163                         unsigned tot_size = ctrl->elems * ctrl->elem_size;
3164
3165                         if (c->size < tot_size) {
3166                                 if (get) {
3167                                         c->size = tot_size;
3168                                         return -ENOSPC;
3169                                 }
3170                                 return -EFAULT;
3171                         }
3172                         c->size = tot_size;
3173                 }
3174                 /* Store the ref to the master control of the cluster */
3175                 h->mref = ref;
3176                 /* Initially set next to 0, meaning that there is no other
3177                    control in this helper array belonging to the same
3178                    cluster */
3179                 h->next = 0;
3180         }
3181
3182         /* We are done if there were no controls that belong to a multi-
3183            control cluster. */
3184         if (!have_clusters)
3185                 return 0;
3186
3187         /* The code below figures out in O(n) time which controls in the list
3188            belong to the same cluster. */
3189
3190         /* This has to be done with the handler lock taken. */
3191         mutex_lock(hdl->lock);
3192
3193         /* First zero the helper field in the master control references */
3194         for (i = 0; i < cs->count; i++)
3195                 helpers[i].mref->helper = NULL;
3196         for (i = 0, h = helpers; i < cs->count; i++, h++) {
3197                 struct v4l2_ctrl_ref *mref = h->mref;
3198
3199                 /* If the mref->helper is set, then it points to an earlier
3200                    helper that belongs to the same cluster. */
3201                 if (mref->helper) {
3202                         /* Set the next field of mref->helper to the current
3203                            index: this means that that earlier helper now
3204                            points to the next helper in the same cluster. */
3205                         mref->helper->next = i;
3206                         /* mref should be set only for the first helper in the
3207                            cluster, clear the others. */
3208                         h->mref = NULL;
3209                 }
3210                 /* Point the mref helper to the current helper struct. */
3211                 mref->helper = h;
3212         }
3213         mutex_unlock(hdl->lock);
3214         return 0;
3215 }
3216
3217 /* Handles the corner case where cs->count == 0. It checks whether the
3218    specified control class exists. If that class ID is 0, then it checks
3219    whether there are any controls at all. */
3220 static int class_check(struct v4l2_ctrl_handler *hdl, u32 which)
3221 {
3222         if (which == 0 || which == V4L2_CTRL_WHICH_DEF_VAL ||
3223             which == V4L2_CTRL_WHICH_REQUEST_VAL)
3224                 return 0;
3225         return find_ref_lock(hdl, which | 1) ? 0 : -EINVAL;
3226 }
3227
3228 /* Get extended controls. Allocates the helpers array if needed. */
3229 static int v4l2_g_ext_ctrls_common(struct v4l2_ctrl_handler *hdl,
3230                                    struct v4l2_ext_controls *cs)
3231 {
3232         struct v4l2_ctrl_helper helper[4];
3233         struct v4l2_ctrl_helper *helpers = helper;
3234         int ret;
3235         int i, j;
3236         bool def_value;
3237
3238         def_value = (cs->which == V4L2_CTRL_WHICH_DEF_VAL);
3239
3240         cs->error_idx = cs->count;
3241         cs->which = V4L2_CTRL_ID2WHICH(cs->which);
3242
3243         if (hdl == NULL)
3244                 return -EINVAL;
3245
3246         if (cs->count == 0)
3247                 return class_check(hdl, cs->which);
3248
3249         if (cs->count > ARRAY_SIZE(helper)) {
3250                 helpers = kvmalloc_array(cs->count, sizeof(helper[0]),
3251                                          GFP_KERNEL);
3252                 if (helpers == NULL)
3253                         return -ENOMEM;
3254         }
3255
3256         ret = prepare_ext_ctrls(hdl, cs, helpers, true);
3257         cs->error_idx = cs->count;
3258
3259         for (i = 0; !ret && i < cs->count; i++)
3260                 if (helpers[i].ref->ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
3261                         ret = -EACCES;
3262
3263         for (i = 0; !ret && i < cs->count; i++) {
3264                 int (*ctrl_to_user)(struct v4l2_ext_control *c,
3265                                     struct v4l2_ctrl *ctrl);
3266                 struct v4l2_ctrl *master;
3267
3268                 ctrl_to_user = def_value ? def_to_user : cur_to_user;
3269
3270                 if (helpers[i].mref == NULL)
3271                         continue;
3272
3273                 master = helpers[i].mref->ctrl;
3274                 cs->error_idx = i;
3275
3276                 v4l2_ctrl_lock(master);
3277
3278                 /* g_volatile_ctrl will update the new control values */
3279                 if (!def_value &&
3280                     ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
3281                     (master->has_volatiles && !is_cur_manual(master)))) {
3282                         for (j = 0; j < master->ncontrols; j++)
3283                                 cur_to_new(master->cluster[j]);
3284                         ret = call_op(master, g_volatile_ctrl);
3285                         ctrl_to_user = new_to_user;
3286                 }
3287                 /* If OK, then copy the current (for non-volatile controls)
3288                    or the new (for volatile controls) control values to the
3289                    caller */
3290                 if (!ret) {
3291                         u32 idx = i;
3292
3293                         do {
3294                                 if (helpers[idx].ref->req)
3295                                         ret = req_to_user(cs->controls + idx,
3296                                                 helpers[idx].ref->req);
3297                                 else
3298                                         ret = ctrl_to_user(cs->controls + idx,
3299                                                 helpers[idx].ref->ctrl);
3300                                 idx = helpers[idx].next;
3301                         } while (!ret && idx);
3302                 }
3303                 v4l2_ctrl_unlock(master);
3304         }
3305
3306         if (cs->count > ARRAY_SIZE(helper))
3307                 kvfree(helpers);
3308         return ret;
3309 }
3310
3311 static struct media_request_object *
3312 v4l2_ctrls_find_req_obj(struct v4l2_ctrl_handler *hdl,
3313                         struct media_request *req, bool set)
3314 {
3315         struct media_request_object *obj;
3316         struct v4l2_ctrl_handler *new_hdl;
3317         int ret;
3318
3319         if (IS_ERR(req))
3320                 return ERR_CAST(req);
3321
3322         if (set && WARN_ON(req->state != MEDIA_REQUEST_STATE_UPDATING))
3323                 return ERR_PTR(-EBUSY);
3324
3325         obj = media_request_object_find(req, &req_ops, hdl);
3326         if (obj)
3327                 return obj;
3328         if (!set)
3329                 return ERR_PTR(-ENOENT);
3330
3331         new_hdl = kzalloc(sizeof(*new_hdl), GFP_KERNEL);
3332         if (!new_hdl)
3333                 return ERR_PTR(-ENOMEM);
3334
3335         obj = &new_hdl->req_obj;
3336         ret = v4l2_ctrl_handler_init(new_hdl, (hdl->nr_of_buckets - 1) * 8);
3337         if (!ret)
3338                 ret = v4l2_ctrl_request_bind(req, new_hdl, hdl);
3339         if (ret) {
3340                 kfree(new_hdl);
3341
3342                 return ERR_PTR(ret);
3343         }
3344
3345         media_request_object_get(obj);
3346         return obj;
3347 }
3348
3349 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct media_device *mdev,
3350                      struct v4l2_ext_controls *cs)
3351 {
3352         struct media_request_object *obj = NULL;
3353         struct media_request *req = NULL;
3354         int ret;
3355
3356         if (cs->which == V4L2_CTRL_WHICH_REQUEST_VAL) {
3357                 if (!mdev || cs->request_fd < 0)
3358                         return -EINVAL;
3359
3360                 req = media_request_get_by_fd(mdev, cs->request_fd);
3361                 if (IS_ERR(req))
3362                         return PTR_ERR(req);
3363
3364                 if (req->state != MEDIA_REQUEST_STATE_COMPLETE) {
3365                         media_request_put(req);
3366                         return -EACCES;
3367                 }
3368
3369                 ret = media_request_lock_for_access(req);
3370                 if (ret) {
3371                         media_request_put(req);
3372                         return ret;
3373                 }
3374
3375                 obj = v4l2_ctrls_find_req_obj(hdl, req, false);
3376                 if (IS_ERR(obj)) {
3377                         media_request_unlock_for_access(req);
3378                         media_request_put(req);
3379                         return PTR_ERR(obj);
3380                 }
3381
3382                 hdl = container_of(obj, struct v4l2_ctrl_handler,
3383                                    req_obj);
3384         }
3385
3386         ret = v4l2_g_ext_ctrls_common(hdl, cs);
3387
3388         if (obj) {
3389                 media_request_unlock_for_access(req);
3390                 media_request_object_put(obj);
3391                 media_request_put(req);
3392         }
3393         return ret;
3394 }
3395 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
3396
3397 /* Helper function to get a single control */
3398 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
3399 {
3400         struct v4l2_ctrl *master = ctrl->cluster[0];
3401         int ret = 0;
3402         int i;
3403
3404         /* Compound controls are not supported. The new_to_user() and
3405          * cur_to_user() calls below would need to be modified not to access
3406          * userspace memory when called from get_ctrl().
3407          */
3408         if (!ctrl->is_int && ctrl->type != V4L2_CTRL_TYPE_INTEGER64)
3409                 return -EINVAL;
3410
3411         if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
3412                 return -EACCES;
3413
3414         v4l2_ctrl_lock(master);
3415         /* g_volatile_ctrl will update the current control values */
3416         if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
3417                 for (i = 0; i < master->ncontrols; i++)
3418                         cur_to_new(master->cluster[i]);
3419                 ret = call_op(master, g_volatile_ctrl);
3420                 new_to_user(c, ctrl);
3421         } else {
3422                 cur_to_user(c, ctrl);
3423         }
3424         v4l2_ctrl_unlock(master);
3425         return ret;
3426 }
3427
3428 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
3429 {
3430         struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3431         struct v4l2_ext_control c;
3432         int ret;
3433
3434         if (ctrl == NULL || !ctrl->is_int)
3435                 return -EINVAL;
3436         ret = get_ctrl(ctrl, &c);
3437         control->value = c.value;
3438         return ret;
3439 }
3440 EXPORT_SYMBOL(v4l2_g_ctrl);
3441
3442 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
3443 {
3444         struct v4l2_ext_control c;
3445
3446         /* It's a driver bug if this happens. */
3447         WARN_ON(!ctrl->is_int);
3448         c.value = 0;
3449         get_ctrl(ctrl, &c);
3450         return c.value;
3451 }
3452 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
3453
3454 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
3455 {
3456         struct v4l2_ext_control c;
3457
3458         /* It's a driver bug if this happens. */
3459         WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3460         c.value64 = 0;
3461         get_ctrl(ctrl, &c);
3462         return c.value64;
3463 }
3464 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
3465
3466
3467 /* Core function that calls try/s_ctrl and ensures that the new value is
3468    copied to the current value on a set.
3469    Must be called with ctrl->handler->lock held. */
3470 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
3471                               bool set, u32 ch_flags)
3472 {
3473         bool update_flag;
3474         int ret;
3475         int i;
3476
3477         /* Go through the cluster and either validate the new value or
3478            (if no new value was set), copy the current value to the new
3479            value, ensuring a consistent view for the control ops when
3480            called. */
3481         for (i = 0; i < master->ncontrols; i++) {
3482                 struct v4l2_ctrl *ctrl = master->cluster[i];
3483
3484                 if (ctrl == NULL)
3485                         continue;
3486
3487                 if (!ctrl->is_new) {
3488                         cur_to_new(ctrl);
3489                         continue;
3490                 }
3491                 /* Check again: it may have changed since the
3492                    previous check in try_or_set_ext_ctrls(). */
3493                 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3494                         return -EBUSY;
3495         }
3496
3497         ret = call_op(master, try_ctrl);
3498
3499         /* Don't set if there is no change */
3500         if (ret || !set || !cluster_changed(master))
3501                 return ret;
3502         ret = call_op(master, s_ctrl);
3503         if (ret)
3504                 return ret;
3505
3506         /* If OK, then make the new values permanent. */
3507         update_flag = is_cur_manual(master) != is_new_manual(master);
3508
3509         for (i = 0; i < master->ncontrols; i++) {
3510                 /*
3511                  * If we switch from auto to manual mode, and this cluster
3512                  * contains volatile controls, then all non-master controls
3513                  * have to be marked as changed. The 'new' value contains
3514                  * the volatile value (obtained by update_from_auto_cluster),
3515                  * which now has to become the current value.
3516                  */
3517                 if (i && update_flag && is_new_manual(master) &&
3518                     master->has_volatiles && master->cluster[i])
3519                         master->cluster[i]->has_changed = true;
3520
3521                 new_to_cur(fh, master->cluster[i], ch_flags |
3522                         ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
3523         }
3524         return 0;
3525 }
3526
3527 /* Validate controls. */
3528 static int validate_ctrls(struct v4l2_ext_controls *cs,
3529                           struct v4l2_ctrl_helper *helpers, bool set)
3530 {
3531         unsigned i;
3532         int ret = 0;
3533
3534         cs->error_idx = cs->count;
3535         for (i = 0; i < cs->count; i++) {
3536                 struct v4l2_ctrl *ctrl = helpers[i].ref->ctrl;
3537                 union v4l2_ctrl_ptr p_new;
3538
3539                 cs->error_idx = i;
3540
3541                 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3542                         return -EACCES;
3543                 /* This test is also done in try_set_control_cluster() which
3544                    is called in atomic context, so that has the final say,
3545                    but it makes sense to do an up-front check as well. Once
3546                    an error occurs in try_set_control_cluster() some other
3547                    controls may have been set already and we want to do a
3548                    best-effort to avoid that. */
3549                 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3550                         return -EBUSY;
3551                 /*
3552                  * Skip validation for now if the payload needs to be copied
3553                  * from userspace into kernelspace. We'll validate those later.
3554                  */
3555                 if (ctrl->is_ptr)
3556                         continue;
3557                 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3558                         p_new.p_s64 = &cs->controls[i].value64;
3559                 else
3560                         p_new.p_s32 = &cs->controls[i].value;
3561                 ret = validate_new(ctrl, p_new);
3562                 if (ret)
3563                         return ret;
3564         }
3565         return 0;
3566 }
3567
3568 /* Obtain the current volatile values of an autocluster and mark them
3569    as new. */
3570 static void update_from_auto_cluster(struct v4l2_ctrl *master)
3571 {
3572         int i;
3573
3574         for (i = 1; i < master->ncontrols; i++)
3575                 cur_to_new(master->cluster[i]);
3576         if (!call_op(master, g_volatile_ctrl))
3577                 for (i = 1; i < master->ncontrols; i++)
3578                         if (master->cluster[i])
3579                                 master->cluster[i]->is_new = 1;
3580 }
3581
3582 /* Try or try-and-set controls */
3583 static int try_set_ext_ctrls_common(struct v4l2_fh *fh,
3584                                     struct v4l2_ctrl_handler *hdl,
3585                                     struct v4l2_ext_controls *cs, bool set)
3586 {
3587         struct v4l2_ctrl_helper helper[4];
3588         struct v4l2_ctrl_helper *helpers = helper;
3589         unsigned i, j;
3590         int ret;
3591
3592         cs->error_idx = cs->count;
3593
3594         /* Default value cannot be changed */
3595         if (cs->which == V4L2_CTRL_WHICH_DEF_VAL)
3596                 return -EINVAL;
3597
3598         cs->which = V4L2_CTRL_ID2WHICH(cs->which);
3599
3600         if (hdl == NULL)
3601                 return -EINVAL;
3602
3603         if (cs->count == 0)
3604                 return class_check(hdl, cs->which);
3605
3606         if (cs->count > ARRAY_SIZE(helper)) {
3607                 helpers = kvmalloc_array(cs->count, sizeof(helper[0]),
3608                                          GFP_KERNEL);
3609                 if (!helpers)
3610                         return -ENOMEM;
3611         }
3612         ret = prepare_ext_ctrls(hdl, cs, helpers, false);
3613         if (!ret)
3614                 ret = validate_ctrls(cs, helpers, set);
3615         if (ret && set)
3616                 cs->error_idx = cs->count;
3617         for (i = 0; !ret && i < cs->count; i++) {
3618                 struct v4l2_ctrl *master;
3619                 u32 idx = i;
3620
3621                 if (helpers[i].mref == NULL)
3622                         continue;
3623
3624                 cs->error_idx = i;
3625                 master = helpers[i].mref->ctrl;
3626                 v4l2_ctrl_lock(master);
3627
3628                 /* Reset the 'is_new' flags of the cluster */
3629                 for (j = 0; j < master->ncontrols; j++)
3630                         if (master->cluster[j])
3631                                 master->cluster[j]->is_new = 0;
3632
3633                 /* For volatile autoclusters that are currently in auto mode
3634                    we need to discover if it will be set to manual mode.
3635                    If so, then we have to copy the current volatile values
3636                    first since those will become the new manual values (which
3637                    may be overwritten by explicit new values from this set
3638                    of controls). */
3639                 if (master->is_auto && master->has_volatiles &&
3640                                                 !is_cur_manual(master)) {
3641                         /* Pick an initial non-manual value */
3642                         s32 new_auto_val = master->manual_mode_value + 1;
3643                         u32 tmp_idx = idx;
3644
3645                         do {
3646                                 /* Check if the auto control is part of the
3647                                    list, and remember the new value. */
3648                                 if (helpers[tmp_idx].ref->ctrl == master)
3649                                         new_auto_val = cs->controls[tmp_idx].value;
3650                                 tmp_idx = helpers[tmp_idx].next;
3651                         } while (tmp_idx);
3652                         /* If the new value == the manual value, then copy
3653                            the current volatile values. */
3654                         if (new_auto_val == master->manual_mode_value)
3655                                 update_from_auto_cluster(master);
3656                 }
3657
3658                 /* Copy the new caller-supplied control values.
3659                    user_to_new() sets 'is_new' to 1. */
3660                 do {
3661                         struct v4l2_ctrl *ctrl = helpers[idx].ref->ctrl;
3662
3663                         ret = user_to_new(cs->controls + idx, ctrl);
3664                         if (!ret && ctrl->is_ptr)
3665                                 ret = validate_new(ctrl, ctrl->p_new);
3666                         idx = helpers[idx].next;
3667                 } while (!ret && idx);
3668
3669                 if (!ret)
3670                         ret = try_or_set_cluster(fh, master,
3671                                                  !hdl->req_obj.req && set, 0);
3672                 if (!ret && hdl->req_obj.req && set) {
3673                         for (j = 0; j < master->ncontrols; j++) {
3674                                 struct v4l2_ctrl_ref *ref =
3675                                         find_ref(hdl, master->cluster[j]->id);
3676
3677                                 new_to_req(ref);
3678                         }
3679                 }
3680
3681                 /* Copy the new values back to userspace. */
3682                 if (!ret) {
3683                         idx = i;
3684                         do {
3685                                 ret = new_to_user(cs->controls + idx,
3686                                                 helpers[idx].ref->ctrl);
3687                                 idx = helpers[idx].next;
3688                         } while (!ret && idx);
3689                 }
3690                 v4l2_ctrl_unlock(master);
3691         }
3692
3693         if (cs->count > ARRAY_SIZE(helper))
3694                 kvfree(helpers);
3695         return ret;
3696 }
3697
3698 static int try_set_ext_ctrls(struct v4l2_fh *fh,
3699                              struct v4l2_ctrl_handler *hdl, struct media_device *mdev,
3700                              struct v4l2_ext_controls *cs, bool set)
3701 {
3702         struct media_request_object *obj = NULL;
3703         struct media_request *req = NULL;
3704         int ret;
3705
3706         if (cs->which == V4L2_CTRL_WHICH_REQUEST_VAL) {
3707                 if (!mdev || cs->request_fd < 0)
3708                         return -EINVAL;
3709
3710                 req = media_request_get_by_fd(mdev, cs->request_fd);
3711                 if (IS_ERR(req))
3712                         return PTR_ERR(req);
3713
3714                 ret = media_request_lock_for_update(req);
3715                 if (ret) {
3716                         media_request_put(req);
3717                         return ret;
3718                 }
3719
3720                 obj = v4l2_ctrls_find_req_obj(hdl, req, set);
3721                 if (IS_ERR(obj)) {
3722                         media_request_unlock_for_update(req);
3723                         media_request_put(req);
3724                         return PTR_ERR(obj);
3725                 }
3726                 hdl = container_of(obj, struct v4l2_ctrl_handler,
3727                                    req_obj);
3728         }
3729
3730         ret = try_set_ext_ctrls_common(fh, hdl, cs, set);
3731
3732         if (obj) {
3733                 media_request_unlock_for_update(req);
3734                 media_request_object_put(obj);
3735                 media_request_put(req);
3736         }
3737
3738         return ret;
3739 }
3740
3741 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct media_device *mdev,
3742                        struct v4l2_ext_controls *cs)
3743 {
3744         return try_set_ext_ctrls(NULL, hdl, mdev, cs, false);
3745 }
3746 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
3747
3748 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3749                      struct media_device *mdev, struct v4l2_ext_controls *cs)
3750 {
3751         return try_set_ext_ctrls(fh, hdl, mdev, cs, true);
3752 }
3753 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
3754
3755 /* Helper function for VIDIOC_S_CTRL compatibility */
3756 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
3757 {
3758         struct v4l2_ctrl *master = ctrl->cluster[0];
3759         int ret;
3760         int i;
3761
3762         /* Reset the 'is_new' flags of the cluster */
3763         for (i = 0; i < master->ncontrols; i++)
3764                 if (master->cluster[i])
3765                         master->cluster[i]->is_new = 0;
3766
3767         ret = validate_new(ctrl, ctrl->p_new);
3768         if (ret)
3769                 return ret;
3770
3771         /* For autoclusters with volatiles that are switched from auto to
3772            manual mode we have to update the current volatile values since
3773            those will become the initial manual values after such a switch. */
3774         if (master->is_auto && master->has_volatiles && ctrl == master &&
3775             !is_cur_manual(master) && ctrl->val == master->manual_mode_value)
3776                 update_from_auto_cluster(master);
3777
3778         ctrl->is_new = 1;
3779         return try_or_set_cluster(fh, master, true, ch_flags);
3780 }
3781
3782 /* Helper function for VIDIOC_S_CTRL compatibility */
3783 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
3784                          struct v4l2_ext_control *c)
3785 {
3786         int ret;
3787
3788         v4l2_ctrl_lock(ctrl);
3789         user_to_new(c, ctrl);
3790         ret = set_ctrl(fh, ctrl, 0);
3791         if (!ret)
3792                 cur_to_user(c, ctrl);
3793         v4l2_ctrl_unlock(ctrl);
3794         return ret;
3795 }
3796
3797 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3798                                         struct v4l2_control *control)
3799 {
3800         struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3801         struct v4l2_ext_control c = { control->id };
3802         int ret;
3803
3804         if (ctrl == NULL || !ctrl->is_int)
3805                 return -EINVAL;
3806
3807         if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3808                 return -EACCES;
3809
3810         c.value = control->value;
3811         ret = set_ctrl_lock(fh, ctrl, &c);
3812         control->value = c.value;
3813         return ret;
3814 }
3815 EXPORT_SYMBOL(v4l2_s_ctrl);
3816
3817 int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
3818 {
3819         lockdep_assert_held(ctrl->handler->lock);
3820
3821         /* It's a driver bug if this happens. */
3822         WARN_ON(!ctrl->is_int);
3823         ctrl->val = val;
3824         return set_ctrl(NULL, ctrl, 0);
3825 }
3826 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl);
3827
3828 int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
3829 {
3830         lockdep_assert_held(ctrl->handler->lock);
3831
3832         /* It's a driver bug if this happens. */
3833         WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3834         *ctrl->p_new.p_s64 = val;
3835         return set_ctrl(NULL, ctrl, 0);
3836 }
3837 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_int64);
3838
3839 int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
3840 {
3841         lockdep_assert_held(ctrl->handler->lock);
3842
3843         /* It's a driver bug if this happens. */
3844         WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING);
3845         strscpy(ctrl->p_new.p_char, s, ctrl->maximum + 1);
3846         return set_ctrl(NULL, ctrl, 0);
3847 }
3848 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_string);
3849
3850 void v4l2_ctrl_request_complete(struct media_request *req,
3851                                 struct v4l2_ctrl_handler *main_hdl)
3852 {
3853         struct media_request_object *obj;
3854         struct v4l2_ctrl_handler *hdl;
3855         struct v4l2_ctrl_ref *ref;
3856
3857         if (!req || !main_hdl)
3858                 return;
3859
3860         /*
3861          * Note that it is valid if nothing was found. It means
3862          * that this request doesn't have any controls and so just
3863          * wants to leave the controls unchanged.
3864          */
3865         obj = media_request_object_find(req, &req_ops, main_hdl);
3866         if (!obj)
3867                 return;
3868         hdl = container_of(obj, struct v4l2_ctrl_handler, req_obj);
3869
3870         list_for_each_entry(ref, &hdl->ctrl_refs, node) {
3871                 struct v4l2_ctrl *ctrl = ref->ctrl;
3872                 struct v4l2_ctrl *master = ctrl->cluster[0];
3873                 unsigned int i;
3874
3875                 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
3876                         ref->req = ref;
3877
3878                         v4l2_ctrl_lock(master);
3879                         /* g_volatile_ctrl will update the current control values */
3880                         for (i = 0; i < master->ncontrols; i++)
3881                                 cur_to_new(master->cluster[i]);
3882                         call_op(master, g_volatile_ctrl);
3883                         new_to_req(ref);
3884                         v4l2_ctrl_unlock(master);
3885                         continue;
3886                 }
3887                 if (ref->req == ref)
3888                         continue;
3889
3890                 v4l2_ctrl_lock(ctrl);
3891                 if (ref->req)
3892                         ptr_to_ptr(ctrl, ref->req->p_req, ref->p_req);
3893                 else
3894                         ptr_to_ptr(ctrl, ctrl->p_cur, ref->p_req);
3895                 v4l2_ctrl_unlock(ctrl);
3896         }
3897
3898         WARN_ON(!hdl->request_is_queued);
3899         list_del_init(&hdl->requests_queued);
3900         hdl->request_is_queued = false;
3901         media_request_object_complete(obj);
3902         media_request_object_put(obj);
3903 }
3904 EXPORT_SYMBOL(v4l2_ctrl_request_complete);
3905
3906 int v4l2_ctrl_request_setup(struct media_request *req,
3907                              struct v4l2_ctrl_handler *main_hdl)
3908 {
3909         struct media_request_object *obj;
3910         struct v4l2_ctrl_handler *hdl;
3911         struct v4l2_ctrl_ref *ref;
3912         int ret = 0;
3913
3914         if (!req || !main_hdl)
3915                 return 0;
3916
3917         if (WARN_ON(req->state != MEDIA_REQUEST_STATE_QUEUED))
3918                 return -EBUSY;
3919
3920         /*
3921          * Note that it is valid if nothing was found. It means
3922          * that this request doesn't have any controls and so just
3923          * wants to leave the controls unchanged.
3924          */
3925         obj = media_request_object_find(req, &req_ops, main_hdl);
3926         if (!obj)
3927                 return 0;
3928         if (obj->completed) {
3929                 media_request_object_put(obj);
3930                 return -EBUSY;
3931         }
3932         hdl = container_of(obj, struct v4l2_ctrl_handler, req_obj);
3933
3934         list_for_each_entry(ref, &hdl->ctrl_refs, node)
3935                 ref->req_done = false;
3936
3937         list_for_each_entry(ref, &hdl->ctrl_refs, node) {
3938                 struct v4l2_ctrl *ctrl = ref->ctrl;
3939                 struct v4l2_ctrl *master = ctrl->cluster[0];
3940                 bool have_new_data = false;
3941                 int i;
3942
3943                 /*
3944                  * Skip if this control was already handled by a cluster.
3945                  * Skip button controls and read-only controls.
3946                  */
3947                 if (ref->req_done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
3948                     (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
3949                         continue;
3950
3951                 v4l2_ctrl_lock(master);
3952                 for (i = 0; i < master->ncontrols; i++) {
3953                         if (master->cluster[i]) {
3954                                 struct v4l2_ctrl_ref *r =
3955                                         find_ref(hdl, master->cluster[i]->id);
3956
3957                                 if (r->req && r == r->req) {
3958                                         have_new_data = true;
3959                                         break;
3960                                 }
3961                         }
3962                 }
3963                 if (!have_new_data) {
3964                         v4l2_ctrl_unlock(master);
3965                         continue;
3966                 }
3967
3968                 for (i = 0; i < master->ncontrols; i++) {
3969                         if (master->cluster[i]) {
3970                                 struct v4l2_ctrl_ref *r =
3971                                         find_ref(hdl, master->cluster[i]->id);
3972
3973                                 req_to_new(r);
3974                                 master->cluster[i]->is_new = 1;
3975                                 r->req_done = true;
3976                         }
3977                 }
3978                 /*
3979                  * For volatile autoclusters that are currently in auto mode
3980                  * we need to discover if it will be set to manual mode.
3981                  * If so, then we have to copy the current volatile values
3982                  * first since those will become the new manual values (which
3983                  * may be overwritten by explicit new values from this set
3984                  * of controls).
3985                  */
3986                 if (master->is_auto && master->has_volatiles &&
3987                     !is_cur_manual(master)) {
3988                         s32 new_auto_val = *master->p_new.p_s32;
3989
3990                         /*
3991                          * If the new value == the manual value, then copy
3992                          * the current volatile values.
3993                          */
3994                         if (new_auto_val == master->manual_mode_value)
3995                                 update_from_auto_cluster(master);
3996                 }
3997
3998                 ret = try_or_set_cluster(NULL, master, true, 0);
3999                 v4l2_ctrl_unlock(master);
4000
4001                 if (ret)
4002                         break;
4003         }
4004
4005         media_request_object_put(obj);
4006         return ret;
4007 }
4008 EXPORT_SYMBOL(v4l2_ctrl_request_setup);
4009
4010 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
4011 {
4012         if (ctrl == NULL)
4013                 return;
4014         if (notify == NULL) {
4015                 ctrl->call_notify = 0;
4016                 return;
4017         }
4018         if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
4019                 return;
4020         ctrl->handler->notify = notify;
4021         ctrl->handler->notify_priv = priv;
4022         ctrl->call_notify = 1;
4023 }
4024 EXPORT_SYMBOL(v4l2_ctrl_notify);
4025
4026 int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
4027                         s64 min, s64 max, u64 step, s64 def)
4028 {
4029         bool value_changed;
4030         bool range_changed = false;
4031         int ret;
4032
4033         lockdep_assert_held(ctrl->handler->lock);
4034
4035         switch (ctrl->type) {
4036         case V4L2_CTRL_TYPE_INTEGER:
4037         case V4L2_CTRL_TYPE_INTEGER64:
4038         case V4L2_CTRL_TYPE_BOOLEAN:
4039         case V4L2_CTRL_TYPE_MENU:
4040         case V4L2_CTRL_TYPE_INTEGER_MENU:
4041         case V4L2_CTRL_TYPE_BITMASK:
4042         case V4L2_CTRL_TYPE_U8:
4043         case V4L2_CTRL_TYPE_U16:
4044         case V4L2_CTRL_TYPE_U32:
4045                 if (ctrl->is_array)
4046                         return -EINVAL;
4047                 ret = check_range(ctrl->type, min, max, step, def);
4048                 if (ret)
4049                         return ret;
4050                 break;
4051         default:
4052                 return -EINVAL;
4053         }
4054         if ((ctrl->minimum != min) || (ctrl->maximum != max) ||
4055                 (ctrl->step != step) || ctrl->default_value != def) {
4056                 range_changed = true;
4057                 ctrl->minimum = min;
4058                 ctrl->maximum = max;
4059                 ctrl->step = step;
4060                 ctrl->default_value = def;
4061         }
4062         cur_to_new(ctrl);
4063         if (validate_new(ctrl, ctrl->p_new)) {
4064                 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
4065                         *ctrl->p_new.p_s64 = def;
4066                 else
4067                         *ctrl->p_new.p_s32 = def;
4068         }
4069
4070         if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
4071                 value_changed = *ctrl->p_new.p_s64 != *ctrl->p_cur.p_s64;
4072         else
4073                 value_changed = *ctrl->p_new.p_s32 != *ctrl->p_cur.p_s32;
4074         if (value_changed)
4075                 ret = set_ctrl(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
4076         else if (range_changed)
4077                 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
4078         return ret;
4079 }
4080 EXPORT_SYMBOL(__v4l2_ctrl_modify_range);
4081
4082 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
4083 {
4084         struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
4085
4086         if (ctrl == NULL)
4087                 return -EINVAL;
4088
4089         v4l2_ctrl_lock(ctrl);
4090         list_add_tail(&sev->node, &ctrl->ev_subs);
4091         if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
4092             (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
4093                 struct v4l2_event ev;
4094                 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
4095
4096                 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
4097                         changes |= V4L2_EVENT_CTRL_CH_VALUE;
4098                 fill_event(&ev, ctrl, changes);
4099                 /* Mark the queue as active, allowing this initial
4100                    event to be accepted. */
4101                 sev->elems = elems;
4102                 v4l2_event_queue_fh(sev->fh, &ev);
4103         }
4104         v4l2_ctrl_unlock(ctrl);
4105         return 0;
4106 }
4107
4108 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
4109 {
4110         struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
4111
4112         if (ctrl == NULL)
4113                 return;
4114
4115         v4l2_ctrl_lock(ctrl);
4116         list_del(&sev->node);
4117         v4l2_ctrl_unlock(ctrl);
4118 }
4119
4120 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
4121 {
4122         u32 old_changes = old->u.ctrl.changes;
4123
4124         old->u.ctrl = new->u.ctrl;
4125         old->u.ctrl.changes |= old_changes;
4126 }
4127 EXPORT_SYMBOL(v4l2_ctrl_replace);
4128
4129 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
4130 {
4131         new->u.ctrl.changes |= old->u.ctrl.changes;
4132 }
4133 EXPORT_SYMBOL(v4l2_ctrl_merge);
4134
4135 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
4136         .add = v4l2_ctrl_add_event,
4137         .del = v4l2_ctrl_del_event,
4138         .replace = v4l2_ctrl_replace,
4139         .merge = v4l2_ctrl_merge,
4140 };
4141 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
4142
4143 int v4l2_ctrl_log_status(struct file *file, void *fh)
4144 {
4145         struct video_device *vfd = video_devdata(file);
4146         struct v4l2_fh *vfh = file->private_data;
4147
4148         if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
4149                 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
4150                         vfd->v4l2_dev->name);
4151         return 0;
4152 }
4153 EXPORT_SYMBOL(v4l2_ctrl_log_status);
4154
4155 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
4156                                 const struct v4l2_event_subscription *sub)
4157 {
4158         if (sub->type == V4L2_EVENT_CTRL)
4159                 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
4160         return -EINVAL;
4161 }
4162 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
4163
4164 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
4165                                      struct v4l2_event_subscription *sub)
4166 {
4167         if (!sd->ctrl_handler)
4168                 return -EINVAL;
4169         return v4l2_ctrl_subscribe_event(fh, sub);
4170 }
4171 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
4172
4173 __poll_t v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
4174 {
4175         struct v4l2_fh *fh = file->private_data;
4176
4177         poll_wait(file, &fh->wait, wait);
4178         if (v4l2_event_pending(fh))
4179                 return EPOLLPRI;
4180         return 0;
4181 }
4182 EXPORT_SYMBOL(v4l2_ctrl_poll);