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

   1 /*
   2     V4L2 controls framework implementation.
   3
   4     Copyright (C) 2010  Hans Verkuil <hverkuil@xs4all.nl>
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <linux/ctype.h>
  22 #include <linux/slab.h>
  23 #include <linux/export.h>
  24 #include <media/v4l2-ioctl.h>
  25 #include <media/v4l2-device.h>
  26 #include <media/v4l2-ctrls.h>
  27 #include <media/v4l2-event.h>
  28 #include <media/v4l2-dev.h>
  29
  30 #define has_op(master, op) \
  31         (master->ops && master->ops->op)
  32 #define call_op(master, op) \
  33         (has_op(master, op) ? master->ops->op(master) : 0)
  34
  35 /* Internal temporary helper struct, one for each v4l2_ext_control */
  36 struct v4l2_ctrl_helper {
  37         /* Pointer to the control reference of the master control */
  38         struct v4l2_ctrl_ref *mref;
  39         /* The control corresponding to the v4l2_ext_control ID field. */
  40         struct v4l2_ctrl *ctrl;
  41         /* v4l2_ext_control index of the next control belonging to the
  42            same cluster, or 0 if there isn't any. */
  43         u32 next;
  44 };
  45
  46 /* Small helper function to determine if the autocluster is set to manual
  47    mode. */
  48 static bool is_cur_manual(const struct v4l2_ctrl *master)
  49 {
  50         return master->is_auto && master->cur.val == master->manual_mode_value;
  51 }
  52
  53 /* Same as above, but this checks the against the new value instead of the
  54    current value. */
  55 static bool is_new_manual(const struct v4l2_ctrl *master)
  56 {
  57         return master->is_auto && master->val == master->manual_mode_value;
  58 }
  59
  60 /* Returns NULL or a character pointer array containing the menu for
  61    the given control ID. The pointer array ends with a NULL pointer.
  62    An empty string signifies a menu entry that is invalid. This allows
  63    drivers to disable certain options if it is not supported. */
  64 const char * const *v4l2_ctrl_get_menu(u32 id)
  65 {
  66         static const char * const mpeg_audio_sampling_freq[] = {
  67                 "44.1 kHz",
  68                 "48 kHz",
  69                 "32 kHz",
  70                 NULL
  71         };
  72         static const char * const mpeg_audio_encoding[] = {
  73                 "MPEG-1/2 Layer I",
  74                 "MPEG-1/2 Layer II",
  75                 "MPEG-1/2 Layer III",
  76                 "MPEG-2/4 AAC",
  77                 "AC-3",
  78                 NULL
  79         };
  80         static const char * const mpeg_audio_l1_bitrate[] = {
  81                 "32 kbps",
  82                 "64 kbps",
  83                 "96 kbps",
  84                 "128 kbps",
  85                 "160 kbps",
  86                 "192 kbps",
  87                 "224 kbps",
  88                 "256 kbps",
  89                 "288 kbps",
  90                 "320 kbps",
  91                 "352 kbps",
  92                 "384 kbps",
  93                 "416 kbps",
  94                 "448 kbps",
  95                 NULL
  96         };
  97         static const char * const mpeg_audio_l2_bitrate[] = {
  98                 "32 kbps",
  99                 "48 kbps",
 100                 "56 kbps",
 101                 "64 kbps",
 102                 "80 kbps",
 103                 "96 kbps",
 104                 "112 kbps",
 105                 "128 kbps",
 106                 "160 kbps",
 107                 "192 kbps",
 108                 "224 kbps",
 109                 "256 kbps",
 110                 "320 kbps",
 111                 "384 kbps",
 112                 NULL
 113         };
 114         static const char * const mpeg_audio_l3_bitrate[] = {
 115                 "32 kbps",
 116                 "40 kbps",
 117                 "48 kbps",
 118                 "56 kbps",
 119                 "64 kbps",
 120                 "80 kbps",
 121                 "96 kbps",
 122                 "112 kbps",
 123                 "128 kbps",
 124                 "160 kbps",
 125                 "192 kbps",
 126                 "224 kbps",
 127                 "256 kbps",
 128                 "320 kbps",
 129                 NULL
 130         };
 131         static const char * const mpeg_audio_ac3_bitrate[] = {
 132                 "32 kbps",
 133                 "40 kbps",
 134                 "48 kbps",
 135                 "56 kbps",
 136                 "64 kbps",
 137                 "80 kbps",
 138                 "96 kbps",
 139                 "112 kbps",
 140                 "128 kbps",
 141                 "160 kbps",
 142                 "192 kbps",
 143                 "224 kbps",
 144                 "256 kbps",
 145                 "320 kbps",
 146                 "384 kbps",
 147                 "448 kbps",
 148                 "512 kbps",
 149                 "576 kbps",
 150                 "640 kbps",
 151                 NULL
 152         };
 153         static const char * const mpeg_audio_mode[] = {
 154                 "Stereo",
 155                 "Joint Stereo",
 156                 "Dual",
 157                 "Mono",
 158                 NULL
 159         };
 160         static const char * const mpeg_audio_mode_extension[] = {
 161                 "Bound 4",
 162                 "Bound 8",
 163                 "Bound 12",
 164                 "Bound 16",
 165                 NULL
 166         };
 167         static const char * const mpeg_audio_emphasis[] = {
 168                 "No Emphasis",
 169                 "50/15 us",
 170                 "CCITT J17",
 171                 NULL
 172         };
 173         static const char * const mpeg_audio_crc[] = {
 174                 "No CRC",
 175                 "16-bit CRC",
 176                 NULL
 177         };
 178         static const char * const mpeg_audio_dec_playback[] = {
 179                 "Auto",
 180                 "Stereo",
 181                 "Left",
 182                 "Right",
 183                 "Mono",
 184                 "Swapped Stereo",
 185                 NULL
 186         };
 187         static const char * const mpeg_video_encoding[] = {
 188                 "MPEG-1",
 189                 "MPEG-2",
 190                 "MPEG-4 AVC",
 191                 NULL
 192         };
 193         static const char * const mpeg_video_aspect[] = {
 194                 "1x1",
 195                 "4x3",
 196                 "16x9",
 197                 "2.21x1",
 198                 NULL
 199         };
 200         static const char * const mpeg_video_bitrate_mode[] = {
 201                 "Variable Bitrate",
 202                 "Constant Bitrate",
 203                 NULL
 204         };
 205         static const char * const mpeg_stream_type[] = {
 206                 "MPEG-2 Program Stream",
 207                 "MPEG-2 Transport Stream",
 208                 "MPEG-1 System Stream",
 209                 "MPEG-2 DVD-compatible Stream",
 210                 "MPEG-1 VCD-compatible Stream",
 211                 "MPEG-2 SVCD-compatible Stream",
 212                 NULL
 213         };
 214         static const char * const mpeg_stream_vbi_fmt[] = {
 215                 "No VBI",
 216                 "Private Packet, IVTV Format",
 217                 NULL
 218         };
 219         static const char * const camera_power_line_frequency[] = {
 220                 "Disabled",
 221                 "50 Hz",
 222                 "60 Hz",
 223                 "Auto",
 224                 NULL
 225         };
 226         static const char * const camera_exposure_auto[] = {
 227                 "Auto Mode",
 228                 "Manual Mode",
 229                 "Shutter Priority Mode",
 230                 "Aperture Priority Mode",
 231                 NULL
 232         };
 233         static const char * const camera_exposure_metering[] = {
 234                 "Average",
 235                 "Center Weighted",
 236                 "Spot",
 237                 "Matrix",
 238                 NULL
 239         };
 240         static const char * const camera_auto_focus_range[] = {
 241                 "Auto",
 242                 "Normal",
 243                 "Macro",
 244                 "Infinity",
 245                 NULL
 246         };
 247         static const char * const colorfx[] = {
 248                 "None",
 249                 "Black & White",
 250                 "Sepia",
 251                 "Negative",
 252                 "Emboss",
 253                 "Sketch",
 254                 "Sky Blue",
 255                 "Grass Green",
 256                 "Skin Whiten",
 257                 "Vivid",
 258                 "Aqua",
 259                 "Art Freeze",
 260                 "Silhouette",
 261                 "Solarization",
 262                 "Antique",
 263                 "Set Cb/Cr",
 264                 NULL
 265         };
 266         static const char * const auto_n_preset_white_balance[] = {
 267                 "Manual",
 268                 "Auto",
 269                 "Incandescent",
 270                 "Fluorescent",
 271                 "Fluorescent H",
 272                 "Horizon",
 273                 "Daylight",
 274                 "Flash",
 275                 "Cloudy",
 276                 "Shade",
 277                 NULL,
 278         };
 279         static const char * const camera_iso_sensitivity_auto[] = {
 280                 "Manual",
 281                 "Auto",
 282                 NULL
 283         };
 284         static const char * const scene_mode[] = {
 285                 "None",
 286                 "Backlight",
 287                 "Beach/Snow",
 288                 "Candle Light",
 289                 "Dusk/Dawn",
 290                 "Fall Colors",
 291                 "Fireworks",
 292                 "Landscape",
 293                 "Night",
 294                 "Party/Indoor",
 295                 "Portrait",
 296                 "Sports",
 297                 "Sunset",
 298                 "Text",
 299                 NULL
 300         };
 301         static const char * const tune_emphasis[] = {
 302                 "None",
 303                 "50 Microseconds",
 304                 "75 Microseconds",
 305                 NULL,
 306         };
 307         static const char * const header_mode[] = {
 308                 "Separate Buffer",
 309                 "Joined With 1st Frame",
 310                 NULL,
 311         };
 312         static const char * const multi_slice[] = {
 313                 "Single",
 314                 "Max Macroblocks",
 315                 "Max Bytes",
 316                 NULL,
 317         };
 318         static const char * const entropy_mode[] = {
 319                 "CAVLC",
 320                 "CABAC",
 321                 NULL,
 322         };
 323         static const char * const mpeg_h264_level[] = {
 324                 "1",
 325                 "1b",
 326                 "1.1",
 327                 "1.2",
 328                 "1.3",
 329                 "2",
 330                 "2.1",
 331                 "2.2",
 332                 "3",
 333                 "3.1",
 334                 "3.2",
 335                 "4",
 336                 "4.1",
 337                 "4.2",
 338                 "5",
 339                 "5.1",
 340                 NULL,
 341         };
 342         static const char * const h264_loop_filter[] = {
 343                 "Enabled",
 344                 "Disabled",
 345                 "Disabled at Slice Boundary",
 346                 NULL,
 347         };
 348         static const char * const h264_profile[] = {
 349                 "Baseline",
 350                 "Constrained Baseline",
 351                 "Main",
 352                 "Extended",
 353                 "High",
 354                 "High 10",
 355                 "High 422",
 356                 "High 444 Predictive",
 357                 "High 10 Intra",
 358                 "High 422 Intra",
 359                 "High 444 Intra",
 360                 "CAVLC 444 Intra",
 361                 "Scalable Baseline",
 362                 "Scalable High",
 363                 "Scalable High Intra",
 364                 "Multiview High",
 365                 NULL,
 366         };
 367         static const char * const vui_sar_idc[] = {
 368                 "Unspecified",
 369                 "1:1",
 370                 "12:11",
 371                 "10:11",
 372                 "16:11",
 373                 "40:33",
 374                 "24:11",
 375                 "20:11",
 376                 "32:11",
 377                 "80:33",
 378                 "18:11",
 379                 "15:11",
 380                 "64:33",
 381                 "160:99",
 382                 "4:3",
 383                 "3:2",
 384                 "2:1",
 385                 "Extended SAR",
 386                 NULL,
 387         };
 388         static const char * const h264_fp_arrangement_type[] = {
 389                 "Checkerboard",
 390                 "Column",
 391                 "Row",
 392                 "Side by Side",
 393                 "Top Bottom",
 394                 "Temporal",
 395                 NULL,
 396         };
 397         static const char * const h264_fmo_map_type[] = {
 398                 "Interleaved Slices",
 399                 "Scattered Slices",
 400                 "Foreground with Leftover",
 401                 "Box Out",
 402                 "Raster Scan",
 403                 "Wipe Scan",
 404                 "Explicit",
 405                 NULL,
 406         };
 407         static const char * const mpeg_mpeg4_level[] = {
 408                 "0",
 409                 "0b",
 410                 "1",
 411                 "2",
 412                 "3",
 413                 "3b",
 414                 "4",
 415                 "5",
 416                 NULL,
 417         };
 418         static const char * const mpeg4_profile[] = {
 419                 "Simple",
 420                 "Advanced Simple",
 421                 "Core",
 422                 "Simple Scalable",
 423                 "Advanced Coding Efficiency",
 424                 NULL,
 425         };
 426
 427         static const char * const vpx_golden_frame_sel[] = {
 428                 "Use Previous Frame",
 429                 "Use Previous Specific Frame",
 430                 NULL,
 431         };
 432
 433         static const char * const flash_led_mode[] = {
 434                 "Off",
 435                 "Flash",
 436                 "Torch",
 437                 NULL,
 438         };
 439         static const char * const flash_strobe_source[] = {
 440                 "Software",
 441                 "External",
 442                 NULL,
 443         };
 444
 445         static const char * const jpeg_chroma_subsampling[] = {
 446                 "4:4:4",
 447                 "4:2:2",
 448                 "4:2:0",
 449                 "4:1:1",
 450                 "4:1:0",
 451                 "Gray",
 452                 NULL,
 453         };
 454         static const char * const dv_tx_mode[] = {
 455                 "DVI-D",
 456                 "HDMI",
 457                 NULL,
 458         };
 459         static const char * const dv_rgb_range[] = {
 460                 "Automatic",
 461                 "RGB limited range (16-235)",
 462                 "RGB full range (0-255)",
 463                 NULL,
 464         };
 465         static const char * const detect_md_mode[] = {
 466                 "Disabled",
 467                 "Global",
 468                 "Threshold Grid",
 469                 "Region Grid",
 470                 NULL,
 471         };
 472
 473
 474         switch (id) {
 475         case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
 476                 return mpeg_audio_sampling_freq;
 477         case V4L2_CID_MPEG_AUDIO_ENCODING:
 478                 return mpeg_audio_encoding;
 479         case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
 480                 return mpeg_audio_l1_bitrate;
 481         case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
 482                 return mpeg_audio_l2_bitrate;
 483         case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
 484                 return mpeg_audio_l3_bitrate;
 485         case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
 486                 return mpeg_audio_ac3_bitrate;
 487         case V4L2_CID_MPEG_AUDIO_MODE:
 488                 return mpeg_audio_mode;
 489         case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
 490                 return mpeg_audio_mode_extension;
 491         case V4L2_CID_MPEG_AUDIO_EMPHASIS:
 492                 return mpeg_audio_emphasis;
 493         case V4L2_CID_MPEG_AUDIO_CRC:
 494                 return mpeg_audio_crc;
 495         case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
 496         case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
 497                 return mpeg_audio_dec_playback;
 498         case V4L2_CID_MPEG_VIDEO_ENCODING:
 499                 return mpeg_video_encoding;
 500         case V4L2_CID_MPEG_VIDEO_ASPECT:
 501                 return mpeg_video_aspect;
 502         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
 503                 return mpeg_video_bitrate_mode;
 504         case V4L2_CID_MPEG_STREAM_TYPE:
 505                 return mpeg_stream_type;
 506         case V4L2_CID_MPEG_STREAM_VBI_FMT:
 507                 return mpeg_stream_vbi_fmt;
 508         case V4L2_CID_POWER_LINE_FREQUENCY:
 509                 return camera_power_line_frequency;
 510         case V4L2_CID_EXPOSURE_AUTO:
 511                 return camera_exposure_auto;
 512         case V4L2_CID_EXPOSURE_METERING:
 513                 return camera_exposure_metering;
 514         case V4L2_CID_AUTO_FOCUS_RANGE:
 515                 return camera_auto_focus_range;
 516         case V4L2_CID_COLORFX:
 517                 return colorfx;
 518         case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
 519                 return auto_n_preset_white_balance;
 520         case V4L2_CID_ISO_SENSITIVITY_AUTO:
 521                 return camera_iso_sensitivity_auto;
 522         case V4L2_CID_SCENE_MODE:
 523                 return scene_mode;
 524         case V4L2_CID_TUNE_PREEMPHASIS:
 525                 return tune_emphasis;
 526         case V4L2_CID_TUNE_DEEMPHASIS:
 527                 return tune_emphasis;
 528         case V4L2_CID_FLASH_LED_MODE:
 529                 return flash_led_mode;
 530         case V4L2_CID_FLASH_STROBE_SOURCE:
 531                 return flash_strobe_source;
 532         case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
 533                 return header_mode;
 534         case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
 535                 return multi_slice;
 536         case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
 537                 return entropy_mode;
 538         case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
 539                 return mpeg_h264_level;
 540         case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
 541                 return h264_loop_filter;
 542         case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
 543                 return h264_profile;
 544         case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
 545                 return vui_sar_idc;
 546         case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
 547                 return h264_fp_arrangement_type;
 548         case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
 549                 return h264_fmo_map_type;
 550         case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
 551                 return mpeg_mpeg4_level;
 552         case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
 553                 return mpeg4_profile;
 554         case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
 555                 return vpx_golden_frame_sel;
 556         case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
 557                 return jpeg_chroma_subsampling;
 558         case V4L2_CID_DV_TX_MODE:
 559                 return dv_tx_mode;
 560         case V4L2_CID_DV_TX_RGB_RANGE:
 561         case V4L2_CID_DV_RX_RGB_RANGE:
 562                 return dv_rgb_range;
 563         case V4L2_CID_DETECT_MD_MODE:
 564                 return detect_md_mode;
 565
 566         default:
 567                 return NULL;
 568         }
 569 }
 570 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
 571
 572 #define __v4l2_qmenu_int_len(arr, len) ({ *(len) = ARRAY_SIZE(arr); arr; })
 573 /*
 574  * Returns NULL or an s64 type array containing the menu for given
 575  * control ID. The total number of the menu items is returned in @len.
 576  */
 577 const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len)
 578 {
 579         static const s64 qmenu_int_vpx_num_partitions[] = {
 580                 1, 2, 4, 8,
 581         };
 582
 583         static const s64 qmenu_int_vpx_num_ref_frames[] = {
 584                 1, 2, 3,
 585         };
 586
 587         switch (id) {
 588         case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
 589                 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_partitions, len);
 590         case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
 591                 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_ref_frames, len);
 592         default:
 593                 *len = 0;
 594                 return NULL;
 595         }
 596 }
 597 EXPORT_SYMBOL(v4l2_ctrl_get_int_menu);
 598
 599 /* Return the control name. */
 600 const char *v4l2_ctrl_get_name(u32 id)
 601 {
 602         switch (id) {
 603         /* USER controls */
 604         /* Keep the order of the 'case's the same as in v4l2-controls.h! */
 605         case V4L2_CID_USER_CLASS:               return "User Controls";
 606         case V4L2_CID_BRIGHTNESS:               return "Brightness";
 607         case V4L2_CID_CONTRAST:                 return "Contrast";
 608         case V4L2_CID_SATURATION:               return "Saturation";
 609         case V4L2_CID_HUE:                      return "Hue";
 610         case V4L2_CID_AUDIO_VOLUME:             return "Volume";
 611         case V4L2_CID_AUDIO_BALANCE:            return "Balance";
 612         case V4L2_CID_AUDIO_BASS:               return "Bass";
 613         case V4L2_CID_AUDIO_TREBLE:             return "Treble";
 614         case V4L2_CID_AUDIO_MUTE:               return "Mute";
 615         case V4L2_CID_AUDIO_LOUDNESS:           return "Loudness";
 616         case V4L2_CID_BLACK_LEVEL:              return "Black Level";
 617         case V4L2_CID_AUTO_WHITE_BALANCE:       return "White Balance, Automatic";
 618         case V4L2_CID_DO_WHITE_BALANCE:         return "Do White Balance";
 619         case V4L2_CID_RED_BALANCE:              return "Red Balance";
 620         case V4L2_CID_BLUE_BALANCE:             return "Blue Balance";
 621         case V4L2_CID_GAMMA:                    return "Gamma";
 622         case V4L2_CID_EXPOSURE:                 return "Exposure";
 623         case V4L2_CID_AUTOGAIN:                 return "Gain, Automatic";
 624         case V4L2_CID_GAIN:                     return "Gain";
 625         case V4L2_CID_HFLIP:                    return "Horizontal Flip";
 626         case V4L2_CID_VFLIP:                    return "Vertical Flip";
 627         case V4L2_CID_POWER_LINE_FREQUENCY:     return "Power Line Frequency";
 628         case V4L2_CID_HUE_AUTO:                 return "Hue, Automatic";
 629         case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
 630         case V4L2_CID_SHARPNESS:                return "Sharpness";
 631         case V4L2_CID_BACKLIGHT_COMPENSATION:   return "Backlight Compensation";
 632         case V4L2_CID_CHROMA_AGC:               return "Chroma AGC";
 633         case V4L2_CID_COLOR_KILLER:             return "Color Killer";
 634         case V4L2_CID_COLORFX:                  return "Color Effects";
 635         case V4L2_CID_AUTOBRIGHTNESS:           return "Brightness, Automatic";
 636         case V4L2_CID_BAND_STOP_FILTER:         return "Band-Stop Filter";
 637         case V4L2_CID_ROTATE:                   return "Rotate";
 638         case V4L2_CID_BG_COLOR:                 return "Background Color";
 639         case V4L2_CID_CHROMA_GAIN:              return "Chroma Gain";
 640         case V4L2_CID_ILLUMINATORS_1:           return "Illuminator 1";
 641         case V4L2_CID_ILLUMINATORS_2:           return "Illuminator 2";
 642         case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:  return "Min Number of Capture Buffers";
 643         case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:   return "Min Number of Output Buffers";
 644         case V4L2_CID_ALPHA_COMPONENT:          return "Alpha Component";
 645         case V4L2_CID_COLORFX_CBCR:             return "Color Effects, CbCr";
 646
 647         /* Codec controls */
 648         /* The MPEG controls are applicable to all codec controls
 649          * and the 'MPEG' part of the define is historical */
 650         /* Keep the order of the 'case's the same as in videodev2.h! */
 651         case V4L2_CID_MPEG_CLASS:               return "Codec Controls";
 652         case V4L2_CID_MPEG_STREAM_TYPE:         return "Stream Type";
 653         case V4L2_CID_MPEG_STREAM_PID_PMT:      return "Stream PMT Program ID";
 654         case V4L2_CID_MPEG_STREAM_PID_AUDIO:    return "Stream Audio Program ID";
 655         case V4L2_CID_MPEG_STREAM_PID_VIDEO:    return "Stream Video Program ID";
 656         case V4L2_CID_MPEG_STREAM_PID_PCR:      return "Stream PCR Program ID";
 657         case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
 658         case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
 659         case V4L2_CID_MPEG_STREAM_VBI_FMT:      return "Stream VBI Format";
 660         case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
 661         case V4L2_CID_MPEG_AUDIO_ENCODING:      return "Audio Encoding";
 662         case V4L2_CID_MPEG_AUDIO_L1_BITRATE:    return "Audio Layer I Bitrate";
 663         case V4L2_CID_MPEG_AUDIO_L2_BITRATE:    return "Audio Layer II Bitrate";
 664         case V4L2_CID_MPEG_AUDIO_L3_BITRATE:    return "Audio Layer III Bitrate";
 665         case V4L2_CID_MPEG_AUDIO_MODE:          return "Audio Stereo Mode";
 666         case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
 667         case V4L2_CID_MPEG_AUDIO_EMPHASIS:      return "Audio Emphasis";
 668         case V4L2_CID_MPEG_AUDIO_CRC:           return "Audio CRC";
 669         case V4L2_CID_MPEG_AUDIO_MUTE:          return "Audio Mute";
 670         case V4L2_CID_MPEG_AUDIO_AAC_BITRATE:   return "Audio AAC Bitrate";
 671         case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:   return "Audio AC-3 Bitrate";
 672         case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:  return "Audio Playback";
 673         case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK: return "Audio Multilingual Playback";
 674         case V4L2_CID_MPEG_VIDEO_ENCODING:      return "Video Encoding";
 675         case V4L2_CID_MPEG_VIDEO_ASPECT:        return "Video Aspect";
 676         case V4L2_CID_MPEG_VIDEO_B_FRAMES:      return "Video B Frames";
 677         case V4L2_CID_MPEG_VIDEO_GOP_SIZE:      return "Video GOP Size";
 678         case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:   return "Video GOP Closure";
 679         case V4L2_CID_MPEG_VIDEO_PULLDOWN:      return "Video Pulldown";
 680         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:  return "Video Bitrate Mode";
 681         case V4L2_CID_MPEG_VIDEO_BITRATE:       return "Video Bitrate";
 682         case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK:  return "Video Peak Bitrate";
 683         case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
 684         case V4L2_CID_MPEG_VIDEO_MUTE:          return "Video Mute";
 685         case V4L2_CID_MPEG_VIDEO_MUTE_YUV:      return "Video Mute YUV";
 686         case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:       return "Decoder Slice Interface";
 687         case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:  return "MPEG4 Loop Filter Enable";
 688         case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB:       return "Number of Intra Refresh MBs";
 689         case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:               return "Frame Level Rate Control Enable";
 690         case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:                  return "H264 MB Level Rate Control";
 691         case V4L2_CID_MPEG_VIDEO_HEADER_MODE:                   return "Sequence Header Mode";
 692         case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC:                   return "Max Number of Reference Pics";
 693         case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP:               return "H263 I-Frame QP Value";
 694         case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP:               return "H263 P-Frame QP Value";
 695         case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP:               return "H263 B-Frame QP Value";
 696         case V4L2_CID_MPEG_VIDEO_H263_MIN_QP:                   return "H263 Minimum QP Value";
 697         case V4L2_CID_MPEG_VIDEO_H263_MAX_QP:                   return "H263 Maximum QP Value";
 698         case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP:               return "H264 I-Frame QP Value";
 699         case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP:               return "H264 P-Frame QP Value";
 700         case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP:               return "H264 B-Frame QP Value";
 701         case V4L2_CID_MPEG_VIDEO_H264_MAX_QP:                   return "H264 Maximum QP Value";
 702         case V4L2_CID_MPEG_VIDEO_H264_MIN_QP:                   return "H264 Minimum QP Value";
 703         case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:            return "H264 8x8 Transform Enable";
 704         case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE:                 return "H264 CPB Buffer Size";
 705         case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:             return "H264 Entropy Mode";
 706         case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD:                 return "H264 I-Frame Period";
 707         case V4L2_CID_MPEG_VIDEO_H264_LEVEL:                    return "H264 Level";
 708         case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA:        return "H264 Loop Filter Alpha Offset";
 709         case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA:         return "H264 Loop Filter Beta Offset";
 710         case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:         return "H264 Loop Filter Mode";
 711         case V4L2_CID_MPEG_VIDEO_H264_PROFILE:                  return "H264 Profile";
 712         case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT:       return "Vertical Size of SAR";
 713         case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH:        return "Horizontal Size of SAR";
 714         case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:           return "Aspect Ratio VUI Enable";
 715         case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:              return "VUI Aspect Ratio IDC";
 716         case V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING:        return "H264 Enable Frame Packing SEI";
 717         case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0:   return "H264 Set Curr. Frame as Frame0";
 718         case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:  return "H264 FP Arrangement Type";
 719         case V4L2_CID_MPEG_VIDEO_H264_FMO:                      return "H264 Flexible MB Ordering";
 720         case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:             return "H264 Map Type for FMO";
 721         case V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP:          return "H264 FMO Number of Slice Groups";
 722         case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION:     return "H264 FMO Direction of Change";
 723         case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE:          return "H264 FMO Size of 1st Slice Grp";
 724         case V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH:           return "H264 FMO No. of Consecutive MBs";
 725         case V4L2_CID_MPEG_VIDEO_H264_ASO:                      return "H264 Arbitrary Slice Ordering";
 726         case V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER:          return "H264 ASO Slice Order";
 727         case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING:      return "Enable H264 Hierarchical Coding";
 728         case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE: return "H264 Hierarchical Coding Type";
 729         case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER:return "H264 Number of HC Layers";
 730         case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP:
 731                                                                 return "H264 Set QP Value for HC Layers";
 732         case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP:              return "MPEG4 I-Frame QP Value";
 733         case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP:              return "MPEG4 P-Frame QP Value";
 734         case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP:              return "MPEG4 B-Frame QP Value";
 735         case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP:                  return "MPEG4 Minimum QP Value";
 736         case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP:                  return "MPEG4 Maximum QP Value";
 737         case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:                   return "MPEG4 Level";
 738         case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:                 return "MPEG4 Profile";
 739         case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:                    return "Quarter Pixel Search Enable";
 740         case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES:         return "Maximum Bytes in a Slice";
 741         case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB:            return "Number of MBs in a Slice";
 742         case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:              return "Slice Partitioning Method";
 743         case V4L2_CID_MPEG_VIDEO_VBV_SIZE:                      return "VBV Buffer Size";
 744         case V4L2_CID_MPEG_VIDEO_DEC_PTS:                       return "Video Decoder PTS";
 745         case V4L2_CID_MPEG_VIDEO_DEC_FRAME:                     return "Video Decoder Frame Count";
 746         case V4L2_CID_MPEG_VIDEO_VBV_DELAY:                     return "Initial Delay for VBV Control";
 747         case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:             return "Horizontal MV Search Range";
 748         case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:             return "Vertical MV Search Range";
 749         case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:             return "Repeat Sequence Header";
 750
 751         /* VPX controls */
 752         case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:            return "VPX Number of Partitions";
 753         case V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4:           return "VPX Intra Mode Decision Disable";
 754         case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:            return "VPX No. of Refs for P Frame";
 755         case V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL:              return "VPX Loop Filter Level Range";
 756         case V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS:          return "VPX Deblocking Effect Control";
 757         case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD:   return "VPX Golden Frame Refresh Period";
 758         case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:          return "VPX Golden Frame Indicator";
 759         case V4L2_CID_MPEG_VIDEO_VPX_MIN_QP:                    return "VPX Minimum QP Value";
 760         case V4L2_CID_MPEG_VIDEO_VPX_MAX_QP:                    return "VPX Maximum QP Value";
 761         case V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP:                return "VPX I-Frame QP Value";
 762         case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP:                return "VPX P-Frame QP Value";
 763         case V4L2_CID_MPEG_VIDEO_VPX_PROFILE:                   return "VPX Profile";
 764
 765         /* CAMERA controls */
 766         /* Keep the order of the 'case's the same as in v4l2-controls.h! */
 767         case V4L2_CID_CAMERA_CLASS:             return "Camera Controls";
 768         case V4L2_CID_EXPOSURE_AUTO:            return "Auto Exposure";
 769         case V4L2_CID_EXPOSURE_ABSOLUTE:        return "Exposure Time, Absolute";
 770         case V4L2_CID_EXPOSURE_AUTO_PRIORITY:   return "Exposure, Dynamic Framerate";
 771         case V4L2_CID_PAN_RELATIVE:             return "Pan, Relative";
 772         case V4L2_CID_TILT_RELATIVE:            return "Tilt, Relative";
 773         case V4L2_CID_PAN_RESET:                return "Pan, Reset";
 774         case V4L2_CID_TILT_RESET:               return "Tilt, Reset";
 775         case V4L2_CID_PAN_ABSOLUTE:             return "Pan, Absolute";
 776         case V4L2_CID_TILT_ABSOLUTE:            return "Tilt, Absolute";
 777         case V4L2_CID_FOCUS_ABSOLUTE:           return "Focus, Absolute";
 778         case V4L2_CID_FOCUS_RELATIVE:           return "Focus, Relative";
 779         case V4L2_CID_FOCUS_AUTO:               return "Focus, Automatic Continuous";
 780         case V4L2_CID_ZOOM_ABSOLUTE:            return "Zoom, Absolute";
 781         case V4L2_CID_ZOOM_RELATIVE:            return "Zoom, Relative";
 782         case V4L2_CID_ZOOM_CONTINUOUS:          return "Zoom, Continuous";
 783         case V4L2_CID_PRIVACY:                  return "Privacy";
 784         case V4L2_CID_IRIS_ABSOLUTE:            return "Iris, Absolute";
 785         case V4L2_CID_IRIS_RELATIVE:            return "Iris, Relative";
 786         case V4L2_CID_AUTO_EXPOSURE_BIAS:       return "Auto Exposure, Bias";
 787         case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
 788         case V4L2_CID_WIDE_DYNAMIC_RANGE:       return "Wide Dynamic Range";
 789         case V4L2_CID_IMAGE_STABILIZATION:      return "Image Stabilization";
 790         case V4L2_CID_ISO_SENSITIVITY:          return "ISO Sensitivity";
 791         case V4L2_CID_ISO_SENSITIVITY_AUTO:     return "ISO Sensitivity, Auto";
 792         case V4L2_CID_EXPOSURE_METERING:        return "Exposure, Metering Mode";
 793         case V4L2_CID_SCENE_MODE:               return "Scene Mode";
 794         case V4L2_CID_3A_LOCK:                  return "3A Lock";
 795         case V4L2_CID_AUTO_FOCUS_START:         return "Auto Focus, Start";
 796         case V4L2_CID_AUTO_FOCUS_STOP:          return "Auto Focus, Stop";
 797         case V4L2_CID_AUTO_FOCUS_STATUS:        return "Auto Focus, Status";
 798         case V4L2_CID_AUTO_FOCUS_RANGE:         return "Auto Focus, Range";
 799         case V4L2_CID_PAN_SPEED:                return "Pan, Speed";
 800         case V4L2_CID_TILT_SPEED:               return "Tilt, Speed";
 801
 802         /* FM Radio Modulator controls */
 803         /* Keep the order of the 'case's the same as in v4l2-controls.h! */
 804         case V4L2_CID_FM_TX_CLASS:              return "FM Radio Modulator Controls";
 805         case V4L2_CID_RDS_TX_DEVIATION:         return "RDS Signal Deviation";
 806         case V4L2_CID_RDS_TX_PI:                return "RDS Program ID";
 807         case V4L2_CID_RDS_TX_PTY:               return "RDS Program Type";
 808         case V4L2_CID_RDS_TX_PS_NAME:           return "RDS PS Name";
 809         case V4L2_CID_RDS_TX_RADIO_TEXT:        return "RDS Radio Text";
 810         case V4L2_CID_RDS_TX_MONO_STEREO:       return "RDS Stereo";
 811         case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD:   return "RDS Artificial Head";
 812         case V4L2_CID_RDS_TX_COMPRESSED:        return "RDS Compressed";
 813         case V4L2_CID_RDS_TX_DYNAMIC_PTY:       return "RDS Dynamic PTY";
 814         case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
 815         case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM:   return "RDS Traffic Program";
 816         case V4L2_CID_RDS_TX_MUSIC_SPEECH:      return "RDS Music";
 817         case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE:  return "RDS Enable Alt Frequencies";
 818         case V4L2_CID_RDS_TX_ALT_FREQS:         return "RDS Alternate Frequencies";
 819         case V4L2_CID_AUDIO_LIMITER_ENABLED:    return "Audio Limiter Feature Enabled";
 820         case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
 821         case V4L2_CID_AUDIO_LIMITER_DEVIATION:  return "Audio Limiter Deviation";
 822         case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
 823         case V4L2_CID_AUDIO_COMPRESSION_GAIN:   return "Audio Compression Gain";
 824         case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
 825         case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
 826         case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
 827         case V4L2_CID_PILOT_TONE_ENABLED:       return "Pilot Tone Feature Enabled";
 828         case V4L2_CID_PILOT_TONE_DEVIATION:     return "Pilot Tone Deviation";
 829         case V4L2_CID_PILOT_TONE_FREQUENCY:     return "Pilot Tone Frequency";
 830         case V4L2_CID_TUNE_PREEMPHASIS:         return "Pre-Emphasis";
 831         case V4L2_CID_TUNE_POWER_LEVEL:         return "Tune Power Level";
 832         case V4L2_CID_TUNE_ANTENNA_CAPACITOR:   return "Tune Antenna Capacitor";
 833
 834         /* Flash controls */
 835         /* Keep the order of the 'case's the same as in v4l2-controls.h! */
 836         case V4L2_CID_FLASH_CLASS:              return "Flash Controls";
 837         case V4L2_CID_FLASH_LED_MODE:           return "LED Mode";
 838         case V4L2_CID_FLASH_STROBE_SOURCE:      return "Strobe Source";
 839         case V4L2_CID_FLASH_STROBE:             return "Strobe";
 840         case V4L2_CID_FLASH_STROBE_STOP:        return "Stop Strobe";
 841         case V4L2_CID_FLASH_STROBE_STATUS:      return "Strobe Status";
 842         case V4L2_CID_FLASH_TIMEOUT:            return "Strobe Timeout";
 843         case V4L2_CID_FLASH_INTENSITY:          return "Intensity, Flash Mode";
 844         case V4L2_CID_FLASH_TORCH_INTENSITY:    return "Intensity, Torch Mode";
 845         case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
 846         case V4L2_CID_FLASH_FAULT:              return "Faults";
 847         case V4L2_CID_FLASH_CHARGE:             return "Charge";
 848         case V4L2_CID_FLASH_READY:              return "Ready to Strobe";
 849
 850         /* JPEG encoder controls */
 851         /* Keep the order of the 'case's the same as in v4l2-controls.h! */
 852         case V4L2_CID_JPEG_CLASS:               return "JPEG Compression Controls";
 853         case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:  return "Chroma Subsampling";
 854         case V4L2_CID_JPEG_RESTART_INTERVAL:    return "Restart Interval";
 855         case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
 856         case V4L2_CID_JPEG_ACTIVE_MARKER:       return "Active Markers";
 857
 858         /* Image source controls */
 859         /* Keep the order of the 'case's the same as in v4l2-controls.h! */
 860         case V4L2_CID_IMAGE_SOURCE_CLASS:       return "Image Source Controls";
 861         case V4L2_CID_VBLANK:                   return "Vertical Blanking";
 862         case V4L2_CID_HBLANK:                   return "Horizontal Blanking";
 863         case V4L2_CID_ANALOGUE_GAIN:            return "Analogue Gain";
 864         case V4L2_CID_TEST_PATTERN_RED:         return "Red Pixel Value";
 865         case V4L2_CID_TEST_PATTERN_GREENR:      return "Green (Red) Pixel Value";
 866         case V4L2_CID_TEST_PATTERN_BLUE:        return "Blue Pixel Value";
 867         case V4L2_CID_TEST_PATTERN_GREENB:      return "Green (Blue) Pixel Value";
 868
 869         /* Image processing controls */
 870         /* Keep the order of the 'case's the same as in v4l2-controls.h! */
 871         case V4L2_CID_IMAGE_PROC_CLASS:         return "Image Processing Controls";
 872         case V4L2_CID_LINK_FREQ:                return "Link Frequency";
 873         case V4L2_CID_PIXEL_RATE:               return "Pixel Rate";
 874         case V4L2_CID_TEST_PATTERN:             return "Test Pattern";
 875
 876         /* DV controls */
 877         /* Keep the order of the 'case's the same as in v4l2-controls.h! */
 878         case V4L2_CID_DV_CLASS:                 return "Digital Video Controls";
 879         case V4L2_CID_DV_TX_HOTPLUG:            return "Hotplug Present";
 880         case V4L2_CID_DV_TX_RXSENSE:            return "RxSense Present";
 881         case V4L2_CID_DV_TX_EDID_PRESENT:       return "EDID Present";
 882         case V4L2_CID_DV_TX_MODE:               return "Transmit Mode";
 883         case V4L2_CID_DV_TX_RGB_RANGE:          return "Tx RGB Quantization Range";
 884         case V4L2_CID_DV_RX_POWER_PRESENT:      return "Power Present";
 885         case V4L2_CID_DV_RX_RGB_RANGE:          return "Rx RGB Quantization Range";
 886
 887         case V4L2_CID_FM_RX_CLASS:              return "FM Radio Receiver Controls";
 888         case V4L2_CID_TUNE_DEEMPHASIS:          return "De-Emphasis";
 889         case V4L2_CID_RDS_RECEPTION:            return "RDS Reception";
 890         case V4L2_CID_RF_TUNER_CLASS:           return "RF Tuner Controls";
 891         case V4L2_CID_RF_TUNER_RF_GAIN:         return "RF Gain";
 892         case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:   return "LNA Gain, Auto";
 893         case V4L2_CID_RF_TUNER_LNA_GAIN:        return "LNA Gain";
 894         case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO: return "Mixer Gain, Auto";
 895         case V4L2_CID_RF_TUNER_MIXER_GAIN:      return "Mixer Gain";
 896         case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:    return "IF Gain, Auto";
 897         case V4L2_CID_RF_TUNER_IF_GAIN:         return "IF Gain";
 898         case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:  return "Bandwidth, Auto";
 899         case V4L2_CID_RF_TUNER_BANDWIDTH:       return "Bandwidth";
 900         case V4L2_CID_RF_TUNER_PLL_LOCK:        return "PLL Lock";
 901         case V4L2_CID_RDS_RX_PTY:               return "RDS Program Type";
 902         case V4L2_CID_RDS_RX_PS_NAME:           return "RDS PS Name";
 903         case V4L2_CID_RDS_RX_RADIO_TEXT:        return "RDS Radio Text";
 904         case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
 905         case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:   return "RDS Traffic Program";
 906         case V4L2_CID_RDS_RX_MUSIC_SPEECH:      return "RDS Music";
 907
 908         /* Detection controls */
 909         /* Keep the order of the 'case's the same as in v4l2-controls.h! */
 910         case V4L2_CID_DETECT_CLASS:             return "Detection Controls";
 911         case V4L2_CID_DETECT_MD_MODE:           return "Motion Detection Mode";
 912         case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD: return "MD Global Threshold";
 913         case V4L2_CID_DETECT_MD_THRESHOLD_GRID: return "MD Threshold Grid";
 914         case V4L2_CID_DETECT_MD_REGION_GRID:    return "MD Region Grid";
 915         default:
 916                 return NULL;
 917         }
 918 }
 919 EXPORT_SYMBOL(v4l2_ctrl_get_name);
 920
 921 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
 922                     s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags)
 923 {
 924         *name = v4l2_ctrl_get_name(id);
 925         *flags = 0;
 926
 927         switch (id) {
 928         case V4L2_CID_AUDIO_MUTE:
 929         case V4L2_CID_AUDIO_LOUDNESS:
 930         case V4L2_CID_AUTO_WHITE_BALANCE:
 931         case V4L2_CID_AUTOGAIN:
 932         case V4L2_CID_HFLIP:
 933         case V4L2_CID_VFLIP:
 934         case V4L2_CID_HUE_AUTO:
 935         case V4L2_CID_CHROMA_AGC:
 936         case V4L2_CID_COLOR_KILLER:
 937         case V4L2_CID_AUTOBRIGHTNESS:
 938         case V4L2_CID_MPEG_AUDIO_MUTE:
 939         case V4L2_CID_MPEG_VIDEO_MUTE:
 940         case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
 941         case V4L2_CID_MPEG_VIDEO_PULLDOWN:
 942         case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
 943         case V4L2_CID_FOCUS_AUTO:
 944         case V4L2_CID_PRIVACY:
 945         case V4L2_CID_AUDIO_LIMITER_ENABLED:
 946         case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
 947         case V4L2_CID_PILOT_TONE_ENABLED:
 948         case V4L2_CID_ILLUMINATORS_1:
 949         case V4L2_CID_ILLUMINATORS_2:
 950         case V4L2_CID_FLASH_STROBE_STATUS:
 951         case V4L2_CID_FLASH_CHARGE:
 952         case V4L2_CID_FLASH_READY:
 953         case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
 954         case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
 955         case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
 956         case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
 957         case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
 958         case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
 959         case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
 960         case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
 961         case V4L2_CID_WIDE_DYNAMIC_RANGE:
 962         case V4L2_CID_IMAGE_STABILIZATION:
 963         case V4L2_CID_RDS_RECEPTION:
 964         case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:
 965         case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:
 966         case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:
 967         case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
 968         case V4L2_CID_RF_TUNER_PLL_LOCK:
 969         case V4L2_CID_RDS_TX_MONO_STEREO:
 970         case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD:
 971         case V4L2_CID_RDS_TX_COMPRESSED:
 972         case V4L2_CID_RDS_TX_DYNAMIC_PTY:
 973         case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT:
 974         case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM:
 975         case V4L2_CID_RDS_TX_MUSIC_SPEECH:
 976         case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE:
 977         case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
 978         case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
 979         case V4L2_CID_RDS_RX_MUSIC_SPEECH:
 980                 *type = V4L2_CTRL_TYPE_BOOLEAN;
 981                 *min = 0;
 982                 *max = *step = 1;
 983                 break;
 984         case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:
 985         case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:
 986                 *type = V4L2_CTRL_TYPE_INTEGER;
 987                 break;
 988         case V4L2_CID_PAN_RESET:
 989         case V4L2_CID_TILT_RESET:
 990         case V4L2_CID_FLASH_STROBE:
 991         case V4L2_CID_FLASH_STROBE_STOP:
 992         case V4L2_CID_AUTO_FOCUS_START:
 993         case V4L2_CID_AUTO_FOCUS_STOP:
 994                 *type = V4L2_CTRL_TYPE_BUTTON;
 995                 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
 996                           V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
 997                 *min = *max = *step = *def = 0;
 998                 break;
 999         case V4L2_CID_POWER_LINE_FREQUENCY:
1000         case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
1001         case V4L2_CID_MPEG_AUDIO_ENCODING:
1002         case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
1003         case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
1004         case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
1005         case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
1006         case V4L2_CID_MPEG_AUDIO_MODE:
1007         case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
1008         case V4L2_CID_MPEG_AUDIO_EMPHASIS:
1009         case V4L2_CID_MPEG_AUDIO_CRC:
1010         case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
1011         case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
1012         case V4L2_CID_MPEG_VIDEO_ENCODING:
1013         case V4L2_CID_MPEG_VIDEO_ASPECT:
1014         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1015         case V4L2_CID_MPEG_STREAM_TYPE:
1016         case V4L2_CID_MPEG_STREAM_VBI_FMT:
1017         case V4L2_CID_EXPOSURE_AUTO:
1018         case V4L2_CID_AUTO_FOCUS_RANGE:
1019         case V4L2_CID_COLORFX:
1020         case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
1021         case V4L2_CID_TUNE_PREEMPHASIS:
1022         case V4L2_CID_FLASH_LED_MODE:
1023         case V4L2_CID_FLASH_STROBE_SOURCE:
1024         case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
1025         case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
1026         case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
1027         case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
1028         case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
1029         case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
1030         case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
1031         case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
1032         case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
1033         case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
1034         case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
1035         case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
1036         case V4L2_CID_ISO_SENSITIVITY_AUTO:
1037         case V4L2_CID_EXPOSURE_METERING:
1038         case V4L2_CID_SCENE_MODE:
1039         case V4L2_CID_DV_TX_MODE:
1040         case V4L2_CID_DV_TX_RGB_RANGE:
1041         case V4L2_CID_DV_RX_RGB_RANGE:
1042         case V4L2_CID_TEST_PATTERN:
1043         case V4L2_CID_TUNE_DEEMPHASIS:
1044         case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
1045         case V4L2_CID_DETECT_MD_MODE:
1046                 *type = V4L2_CTRL_TYPE_MENU;
1047                 break;
1048         case V4L2_CID_LINK_FREQ:
1049                 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1050                 break;
1051         case V4L2_CID_RDS_TX_PS_NAME:
1052         case V4L2_CID_RDS_TX_RADIO_TEXT:
1053         case V4L2_CID_RDS_RX_PS_NAME:
1054         case V4L2_CID_RDS_RX_RADIO_TEXT:
1055                 *type = V4L2_CTRL_TYPE_STRING;
1056                 break;
1057         case V4L2_CID_ISO_SENSITIVITY:
1058         case V4L2_CID_AUTO_EXPOSURE_BIAS:
1059         case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
1060         case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
1061                 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1062                 break;
1063         case V4L2_CID_USER_CLASS:
1064         case V4L2_CID_CAMERA_CLASS:
1065         case V4L2_CID_MPEG_CLASS:
1066         case V4L2_CID_FM_TX_CLASS:
1067         case V4L2_CID_FLASH_CLASS:
1068         case V4L2_CID_JPEG_CLASS:
1069         case V4L2_CID_IMAGE_SOURCE_CLASS:
1070         case V4L2_CID_IMAGE_PROC_CLASS:
1071         case V4L2_CID_DV_CLASS:
1072         case V4L2_CID_FM_RX_CLASS:
1073         case V4L2_CID_RF_TUNER_CLASS:
1074         case V4L2_CID_DETECT_CLASS:
1075                 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
1076                 /* You can neither read not write these */
1077                 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
1078                 *min = *max = *step = *def = 0;
1079                 break;
1080         case V4L2_CID_BG_COLOR:
1081                 *type = V4L2_CTRL_TYPE_INTEGER;
1082                 *step = 1;
1083                 *min = 0;
1084                 /* Max is calculated as RGB888 that is 2^24 */
1085                 *max = 0xFFFFFF;
1086                 break;
1087         case V4L2_CID_FLASH_FAULT:
1088         case V4L2_CID_JPEG_ACTIVE_MARKER:
1089         case V4L2_CID_3A_LOCK:
1090         case V4L2_CID_AUTO_FOCUS_STATUS:
1091         case V4L2_CID_DV_TX_HOTPLUG:
1092         case V4L2_CID_DV_TX_RXSENSE:
1093         case V4L2_CID_DV_TX_EDID_PRESENT:
1094         case V4L2_CID_DV_RX_POWER_PRESENT:
1095                 *type = V4L2_CTRL_TYPE_BITMASK;
1096                 break;
1097         case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1098         case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1099                 *type = V4L2_CTRL_TYPE_INTEGER;
1100                 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1101                 break;
1102         case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1103                 *type = V4L2_CTRL_TYPE_INTEGER64;
1104                 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1105                 *min = *def = 0;
1106                 *max = 0x1ffffffffLL;
1107                 *step = 1;
1108                 break;
1109         case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1110                 *type = V4L2_CTRL_TYPE_INTEGER64;
1111                 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1112                 *min = *def = 0;
1113                 *max = 0x7fffffffffffffffLL;
1114                 *step = 1;
1115                 break;
1116         case V4L2_CID_PIXEL_RATE:
1117                 *type = V4L2_CTRL_TYPE_INTEGER64;
1118                 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1119                 break;
1120         case V4L2_CID_DETECT_MD_REGION_GRID:
1121                 *type = V4L2_CTRL_TYPE_U8;
1122                 break;
1123         case V4L2_CID_DETECT_MD_THRESHOLD_GRID:
1124                 *type = V4L2_CTRL_TYPE_U16;
1125                 break;
1126         case V4L2_CID_RDS_TX_ALT_FREQS:
1127                 *type = V4L2_CTRL_TYPE_U32;
1128                 break;
1129         default:
1130                 *type = V4L2_CTRL_TYPE_INTEGER;
1131                 break;
1132         }
1133         switch (id) {
1134         case V4L2_CID_MPEG_AUDIO_ENCODING:
1135         case V4L2_CID_MPEG_AUDIO_MODE:
1136         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1137         case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1138         case V4L2_CID_MPEG_STREAM_TYPE:
1139                 *flags |= V4L2_CTRL_FLAG_UPDATE;
1140                 break;
1141         case V4L2_CID_AUDIO_VOLUME:
1142         case V4L2_CID_AUDIO_BALANCE:
1143         case V4L2_CID_AUDIO_BASS:
1144         case V4L2_CID_AUDIO_TREBLE:
1145         case V4L2_CID_BRIGHTNESS:
1146         case V4L2_CID_CONTRAST:
1147         case V4L2_CID_SATURATION:
1148         case V4L2_CID_HUE:
1149         case V4L2_CID_RED_BALANCE:
1150         case V4L2_CID_BLUE_BALANCE:
1151         case V4L2_CID_GAMMA:
1152         case V4L2_CID_SHARPNESS:
1153         case V4L2_CID_CHROMA_GAIN:
1154         case V4L2_CID_RDS_TX_DEVIATION:
1155         case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1156         case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1157         case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1158         case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1159         case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1160         case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1161         case V4L2_CID_PILOT_TONE_DEVIATION:
1162         case V4L2_CID_PILOT_TONE_FREQUENCY:
1163         case V4L2_CID_TUNE_POWER_LEVEL:
1164         case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1165         case V4L2_CID_RF_TUNER_RF_GAIN:
1166         case V4L2_CID_RF_TUNER_LNA_GAIN:
1167         case V4L2_CID_RF_TUNER_MIXER_GAIN:
1168         case V4L2_CID_RF_TUNER_IF_GAIN:
1169         case V4L2_CID_RF_TUNER_BANDWIDTH:
1170         case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD:
1171                 *flags |= V4L2_CTRL_FLAG_SLIDER;
1172                 break;
1173         case V4L2_CID_PAN_RELATIVE:
1174         case V4L2_CID_TILT_RELATIVE:
1175         case V4L2_CID_FOCUS_RELATIVE:
1176         case V4L2_CID_IRIS_RELATIVE:
1177         case V4L2_CID_ZOOM_RELATIVE:
1178                 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1179                           V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1180                 break;
1181         case V4L2_CID_FLASH_STROBE_STATUS:
1182         case V4L2_CID_AUTO_FOCUS_STATUS:
1183         case V4L2_CID_FLASH_READY:
1184         case V4L2_CID_DV_TX_HOTPLUG:
1185         case V4L2_CID_DV_TX_RXSENSE:
1186         case V4L2_CID_DV_TX_EDID_PRESENT:
1187         case V4L2_CID_DV_RX_POWER_PRESENT:
1188         case V4L2_CID_RDS_RX_PTY:
1189         case V4L2_CID_RDS_RX_PS_NAME:
1190         case V4L2_CID_RDS_RX_RADIO_TEXT:
1191         case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1192         case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1193         case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1194                 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1195                 break;
1196         case V4L2_CID_RF_TUNER_PLL_LOCK:
1197                 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1198                 break;
1199         }
1200 }
1201 EXPORT_SYMBOL(v4l2_ctrl_fill);
1202
1203 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1204 {
1205         memset(ev->reserved, 0, sizeof(ev->reserved));
1206         ev->type = V4L2_EVENT_CTRL;
1207         ev->id = ctrl->id;
1208         ev->u.ctrl.changes = changes;
1209         ev->u.ctrl.type = ctrl->type;
1210         ev->u.ctrl.flags = ctrl->flags;
1211         if (ctrl->is_ptr)
1212                 ev->u.ctrl.value64 = 0;
1213         else
1214                 ev->u.ctrl.value64 = *ctrl->p_cur.p_s64;
1215         ev->u.ctrl.minimum = ctrl->minimum;
1216         ev->u.ctrl.maximum = ctrl->maximum;
1217         if (ctrl->type == V4L2_CTRL_TYPE_MENU
1218             || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1219                 ev->u.ctrl.step = 1;
1220         else
1221                 ev->u.ctrl.step = ctrl->step;
1222         ev->u.ctrl.default_value = ctrl->default_value;
1223 }
1224
1225 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1226 {
1227         struct v4l2_event ev;
1228         struct v4l2_subscribed_event *sev;
1229
1230         if (list_empty(&ctrl->ev_subs))
1231                 return;
1232         fill_event(&ev, ctrl, changes);
1233
1234         list_for_each_entry(sev, &ctrl->ev_subs, node)
1235                 if (sev->fh != fh ||
1236                     (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1237                         v4l2_event_queue_fh(sev->fh, &ev);
1238 }
1239
1240 static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
1241                       union v4l2_ctrl_ptr ptr1,
1242                       union v4l2_ctrl_ptr ptr2)
1243 {
1244         switch (ctrl->type) {
1245         case V4L2_CTRL_TYPE_BUTTON:
1246                 return false;
1247         case V4L2_CTRL_TYPE_STRING:
1248                 idx *= ctrl->elem_size;
1249                 /* strings are always 0-terminated */
1250                 return !strcmp(ptr1.p_char + idx, ptr2.p_char + idx);
1251         case V4L2_CTRL_TYPE_INTEGER64:
1252                 return ptr1.p_s64[idx] == ptr2.p_s64[idx];
1253         case V4L2_CTRL_TYPE_U8:
1254                 return ptr1.p_u8[idx] == ptr2.p_u8[idx];
1255         case V4L2_CTRL_TYPE_U16:
1256                 return ptr1.p_u16[idx] == ptr2.p_u16[idx];
1257         case V4L2_CTRL_TYPE_U32:
1258                 return ptr1.p_u32[idx] == ptr2.p_u32[idx];
1259         default:
1260                 if (ctrl->is_int)
1261                         return ptr1.p_s32[idx] == ptr2.p_s32[idx];
1262                 idx *= ctrl->elem_size;
1263                 return !memcmp(ptr1.p + idx, ptr2.p + idx, ctrl->elem_size);
1264         }
1265 }
1266
1267 static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
1268                      union v4l2_ctrl_ptr ptr)
1269 {
1270         switch (ctrl->type) {
1271         case V4L2_CTRL_TYPE_STRING:
1272                 idx *= ctrl->elem_size;
1273                 memset(ptr.p_char + idx, ' ', ctrl->minimum);
1274                 ptr.p_char[idx + ctrl->minimum] = '\0';
1275                 break;
1276         case V4L2_CTRL_TYPE_INTEGER64:
1277                 ptr.p_s64[idx] = ctrl->default_value;
1278                 break;
1279         case V4L2_CTRL_TYPE_INTEGER:
1280         case V4L2_CTRL_TYPE_INTEGER_MENU:
1281         case V4L2_CTRL_TYPE_MENU:
1282         case V4L2_CTRL_TYPE_BITMASK:
1283         case V4L2_CTRL_TYPE_BOOLEAN:
1284                 ptr.p_s32[idx] = ctrl->default_value;
1285                 break;
1286         case V4L2_CTRL_TYPE_U8:
1287                 ptr.p_u8[idx] = ctrl->default_value;
1288                 break;
1289         case V4L2_CTRL_TYPE_U16:
1290                 ptr.p_u16[idx] = ctrl->default_value;
1291                 break;
1292         case V4L2_CTRL_TYPE_U32:
1293                 ptr.p_u32[idx] = ctrl->default_value;
1294                 break;
1295         default:
1296                 idx *= ctrl->elem_size;
1297                 memset(ptr.p + idx, 0, ctrl->elem_size);
1298                 break;
1299         }
1300 }
1301
1302 static void std_log(const struct v4l2_ctrl *ctrl)
1303 {
1304         union v4l2_ctrl_ptr ptr = ctrl->p_cur;
1305
1306         if (ctrl->is_array) {
1307                 unsigned i;
1308
1309                 for (i = 0; i < ctrl->nr_of_dims; i++)
1310                         pr_cont("[%u]", ctrl->dims[i]);
1311                 pr_cont(" ");
1312         }
1313
1314         switch (ctrl->type) {
1315         case V4L2_CTRL_TYPE_INTEGER:
1316                 pr_cont("%d", *ptr.p_s32);
1317                 break;
1318         case V4L2_CTRL_TYPE_BOOLEAN:
1319                 pr_cont("%s", *ptr.p_s32 ? "true" : "false");
1320                 break;
1321         case V4L2_CTRL_TYPE_MENU:
1322                 pr_cont("%s", ctrl->qmenu[*ptr.p_s32]);
1323                 break;
1324         case V4L2_CTRL_TYPE_INTEGER_MENU:
1325                 pr_cont("%lld", ctrl->qmenu_int[*ptr.p_s32]);
1326                 break;
1327         case V4L2_CTRL_TYPE_BITMASK:
1328                 pr_cont("0x%08x", *ptr.p_s32);
1329                 break;
1330         case V4L2_CTRL_TYPE_INTEGER64:
1331                 pr_cont("%lld", *ptr.p_s64);
1332                 break;
1333         case V4L2_CTRL_TYPE_STRING:
1334                 pr_cont("%s", ptr.p_char);
1335                 break;
1336         case V4L2_CTRL_TYPE_U8:
1337                 pr_cont("%u", (unsigned)*ptr.p_u8);
1338                 break;
1339         case V4L2_CTRL_TYPE_U16:
1340                 pr_cont("%u", (unsigned)*ptr.p_u16);
1341                 break;
1342         case V4L2_CTRL_TYPE_U32:
1343                 pr_cont("%u", (unsigned)*ptr.p_u32);
1344                 break;
1345         default:
1346                 pr_cont("unknown type %d", ctrl->type);
1347                 break;
1348         }
1349 }
1350
1351 /*
1352  * Round towards the closest legal value. Be careful when we are
1353  * close to the maximum range of the control type to prevent
1354  * wrap-arounds.
1355  */
1356 #define ROUND_TO_RANGE(val, offset_type, ctrl)                  \
1357 ({                                                              \
1358         offset_type offset;                                     \
1359         if ((ctrl)->maximum >= 0 &&                             \
1360             val >= (ctrl)->maximum - (s32)((ctrl)->step / 2))   \
1361                 val = (ctrl)->maximum;                          \
1362         else                                                    \
1363                 val += (s32)((ctrl)->step / 2);                 \
1364         val = clamp_t(typeof(val), val,                         \
1365                       (ctrl)->minimum, (ctrl)->maximum);        \
1366         offset = (val) - (ctrl)->minimum;                       \
1367         offset = (ctrl)->step * (offset / (u32)(ctrl)->step);   \
1368         val = (ctrl)->minimum + offset;                         \
1369         0;                                                      \
1370 })
1371
1372 /* Validate a new control */
1373 static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
1374                         union v4l2_ctrl_ptr ptr)
1375 {
1376         size_t len;
1377         u64 offset;
1378         s64 val;
1379
1380         switch (ctrl->type) {
1381         case V4L2_CTRL_TYPE_INTEGER:
1382                 return ROUND_TO_RANGE(ptr.p_s32[idx], u32, ctrl);
1383         case V4L2_CTRL_TYPE_INTEGER64:
1384                 /*
1385                  * We can't use the ROUND_TO_RANGE define here due to
1386                  * the u64 divide that needs special care.
1387                  */
1388                 val = ptr.p_s64[idx];
1389                 if (ctrl->maximum >= 0 && val >= ctrl->maximum - (s64)(ctrl->step / 2))
1390                         val = ctrl->maximum;
1391                 else
1392                         val += (s64)(ctrl->step / 2);
1393                 val = clamp_t(s64, val, ctrl->minimum, ctrl->maximum);
1394                 offset = val - ctrl->minimum;
1395                 do_div(offset, ctrl->step);
1396                 ptr.p_s64[idx] = ctrl->minimum + offset * ctrl->step;
1397                 return 0;
1398         case V4L2_CTRL_TYPE_U8:
1399                 return ROUND_TO_RANGE(ptr.p_u8[idx], u8, ctrl);
1400         case V4L2_CTRL_TYPE_U16:
1401                 return ROUND_TO_RANGE(ptr.p_u16[idx], u16, ctrl);
1402         case V4L2_CTRL_TYPE_U32:
1403                 return ROUND_TO_RANGE(ptr.p_u32[idx], u32, ctrl);
1404
1405         case V4L2_CTRL_TYPE_BOOLEAN:
1406                 ptr.p_s32[idx] = !!ptr.p_s32[idx];
1407                 return 0;
1408
1409         case V4L2_CTRL_TYPE_MENU:
1410         case V4L2_CTRL_TYPE_INTEGER_MENU:
1411                 if (ptr.p_s32[idx] < ctrl->minimum || ptr.p_s32[idx] > ctrl->maximum)
1412                         return -ERANGE;
1413                 if (ctrl->menu_skip_mask & (1 << ptr.p_s32[idx]))
1414                         return -EINVAL;
1415                 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1416                     ctrl->qmenu[ptr.p_s32[idx]][0] == '\0')
1417                         return -EINVAL;
1418                 return 0;
1419
1420         case V4L2_CTRL_TYPE_BITMASK:
1421                 ptr.p_s32[idx] &= ctrl->maximum;
1422                 return 0;
1423
1424         case V4L2_CTRL_TYPE_BUTTON:
1425         case V4L2_CTRL_TYPE_CTRL_CLASS:
1426                 ptr.p_s32[idx] = 0;
1427                 return 0;
1428
1429         case V4L2_CTRL_TYPE_STRING:
1430                 idx *= ctrl->elem_size;
1431                 len = strlen(ptr.p_char + idx);
1432                 if (len < ctrl->minimum)
1433                         return -ERANGE;
1434                 if ((len - (u32)ctrl->minimum) % (u32)ctrl->step)
1435                         return -ERANGE;
1436                 return 0;
1437
1438         default:
1439                 return -EINVAL;
1440         }
1441 }
1442
1443 static const struct v4l2_ctrl_type_ops std_type_ops = {
1444         .equal = std_equal,
1445         .init = std_init,
1446         .log = std_log,
1447         .validate = std_validate,
1448 };
1449
1450 /* Helper function: copy the given control value back to the caller */
1451 static int ptr_to_user(struct v4l2_ext_control *c,
1452                        struct v4l2_ctrl *ctrl,
1453                        union v4l2_ctrl_ptr ptr)
1454 {
1455         u32 len;
1456
1457         if (ctrl->is_ptr && !ctrl->is_string)
1458                 return copy_to_user(c->ptr, ptr.p, c->size) ?
1459                        -EFAULT : 0;
1460
1461         switch (ctrl->type) {
1462         case V4L2_CTRL_TYPE_STRING:
1463                 len = strlen(ptr.p_char);
1464                 if (c->size < len + 1) {
1465                         c->size = ctrl->elem_size;
1466                         return -ENOSPC;
1467                 }
1468                 return copy_to_user(c->string, ptr.p_char, len + 1) ?
1469                        -EFAULT : 0;
1470         case V4L2_CTRL_TYPE_INTEGER64:
1471                 c->value64 = *ptr.p_s64;
1472                 break;
1473         default:
1474                 c->value = *ptr.p_s32;
1475                 break;
1476         }
1477         return 0;
1478 }
1479
1480 /* Helper function: copy the current control value back to the caller */
1481 static int cur_to_user(struct v4l2_ext_control *c,
1482                        struct v4l2_ctrl *ctrl)
1483 {
1484         return ptr_to_user(c, ctrl, ctrl->p_cur);
1485 }
1486
1487 /* Helper function: copy the new control value back to the caller */
1488 static int new_to_user(struct v4l2_ext_control *c,
1489                        struct v4l2_ctrl *ctrl)
1490 {
1491         return ptr_to_user(c, ctrl, ctrl->p_new);
1492 }
1493
1494 /* Helper function: copy the initial control value back to the caller */
1495 static int def_to_user(struct v4l2_ext_control *c, struct v4l2_ctrl *ctrl)
1496 {
1497         int idx;
1498
1499         for (idx = 0; idx < ctrl->elems; idx++)
1500                 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
1501
1502         return ptr_to_user(c, ctrl, ctrl->p_new);
1503 }
1504
1505 /* Helper function: copy the caller-provider value to the given control value */
1506 static int user_to_ptr(struct v4l2_ext_control *c,
1507                        struct v4l2_ctrl *ctrl,
1508                        union v4l2_ctrl_ptr ptr)
1509 {
1510         int ret;
1511         u32 size;
1512
1513         ctrl->is_new = 1;
1514         if (ctrl->is_ptr && !ctrl->is_string) {
1515                 unsigned idx;
1516
1517                 ret = copy_from_user(ptr.p, c->ptr, c->size) ? -EFAULT : 0;
1518                 if (ret || !ctrl->is_array)
1519                         return ret;
1520                 for (idx = c->size / ctrl->elem_size; idx < ctrl->elems; idx++)
1521                         ctrl->type_ops->init(ctrl, idx, ptr);
1522                 return 0;
1523         }
1524
1525         switch (ctrl->type) {
1526         case V4L2_CTRL_TYPE_INTEGER64:
1527                 *ptr.p_s64 = c->value64;
1528                 break;
1529         case V4L2_CTRL_TYPE_STRING:
1530                 size = c->size;
1531                 if (size == 0)
1532                         return -ERANGE;
1533                 if (size > ctrl->maximum + 1)
1534                         size = ctrl->maximum + 1;
1535                 ret = copy_from_user(ptr.p_char, c->string, size) ? -EFAULT : 0;
1536                 if (!ret) {
1537                         char last = ptr.p_char[size - 1];
1538
1539                         ptr.p_char[size - 1] = 0;
1540                         /* If the string was longer than ctrl->maximum,
1541                            then return an error. */
1542                         if (strlen(ptr.p_char) == ctrl->maximum && last)
1543                                 return -ERANGE;
1544                 }
1545                 return ret;
1546         default:
1547                 *ptr.p_s32 = c->value;
1548                 break;
1549         }
1550         return 0;
1551 }
1552
1553 /* Helper function: copy the caller-provider value as the new control value */
1554 static int user_to_new(struct v4l2_ext_control *c,
1555                        struct v4l2_ctrl *ctrl)
1556 {
1557         return user_to_ptr(c, ctrl, ctrl->p_new);
1558 }
1559
1560 /* Copy the one value to another. */
1561 static void ptr_to_ptr(struct v4l2_ctrl *ctrl,
1562                        union v4l2_ctrl_ptr from, union v4l2_ctrl_ptr to)
1563 {
1564         if (ctrl == NULL)
1565                 return;
1566         memcpy(to.p, from.p, ctrl->elems * ctrl->elem_size);
1567 }
1568
1569 /* Copy the new value to the current value. */
1570 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
1571 {
1572         bool changed;
1573
1574         if (ctrl == NULL)
1575                 return;
1576
1577         /* has_changed is set by cluster_changed */
1578         changed = ctrl->has_changed;
1579         if (changed)
1580                 ptr_to_ptr(ctrl, ctrl->p_new, ctrl->p_cur);
1581
1582         if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
1583                 /* Note: CH_FLAGS is only set for auto clusters. */
1584                 ctrl->flags &=
1585                         ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1586                 if (!is_cur_manual(ctrl->cluster[0])) {
1587                         ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1588                         if (ctrl->cluster[0]->has_volatiles)
1589                                 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1590                 }
1591                 fh = NULL;
1592         }
1593         if (changed || ch_flags) {
1594                 /* If a control was changed that was not one of the controls
1595                    modified by the application, then send the event to all. */
1596                 if (!ctrl->is_new)
1597                         fh = NULL;
1598                 send_event(fh, ctrl,
1599                         (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
1600                 if (ctrl->call_notify && changed && ctrl->handler->notify)
1601                         ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
1602         }
1603 }
1604
1605 /* Copy the current value to the new value */
1606 static void cur_to_new(struct v4l2_ctrl *ctrl)
1607 {
1608         if (ctrl == NULL)
1609                 return;
1610         ptr_to_ptr(ctrl, ctrl->p_cur, ctrl->p_new);
1611 }
1612
1613 /* Return non-zero if one or more of the controls in the cluster has a new
1614    value that differs from the current value. */
1615 static int cluster_changed(struct v4l2_ctrl *master)
1616 {
1617         bool changed = false;
1618         unsigned idx;
1619         int i;
1620
1621         for (i = 0; i < master->ncontrols; i++) {
1622                 struct v4l2_ctrl *ctrl = master->cluster[i];
1623                 bool ctrl_changed = false;
1624
1625                 if (ctrl == NULL)
1626                         continue;
1627
1628                 if (ctrl->flags & V4L2_CTRL_FLAG_EXECUTE_ON_WRITE)
1629                         changed = ctrl_changed = true;
1630
1631                 /*
1632                  * Set has_changed to false to avoid generating
1633                  * the event V4L2_EVENT_CTRL_CH_VALUE
1634                  */
1635                 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
1636                         ctrl->has_changed = false;
1637                         continue;
1638                 }
1639
1640                 for (idx = 0; !ctrl_changed && idx < ctrl->elems; idx++)
1641                         ctrl_changed = !ctrl->type_ops->equal(ctrl, idx,
1642                                 ctrl->p_cur, ctrl->p_new);
1643                 ctrl->has_changed = ctrl_changed;
1644                 changed |= ctrl->has_changed;
1645         }
1646         return changed;
1647 }
1648
1649 /* Control range checking */
1650 static int check_range(enum v4l2_ctrl_type type,
1651                 s64 min, s64 max, u64 step, s64 def)
1652 {
1653         switch (type) {
1654         case V4L2_CTRL_TYPE_BOOLEAN:
1655                 if (step != 1 || max > 1 || min < 0)
1656                         return -ERANGE;
1657                 /* fall through */
1658         case V4L2_CTRL_TYPE_U8:
1659         case V4L2_CTRL_TYPE_U16:
1660         case V4L2_CTRL_TYPE_U32:
1661         case V4L2_CTRL_TYPE_INTEGER:
1662         case V4L2_CTRL_TYPE_INTEGER64:
1663                 if (step == 0 || min > max || def < min || def > max)
1664                         return -ERANGE;
1665                 return 0;
1666         case V4L2_CTRL_TYPE_BITMASK:
1667                 if (step || min || !max || (def & ~max))
1668                         return -ERANGE;
1669                 return 0;
1670         case V4L2_CTRL_TYPE_MENU:
1671         case V4L2_CTRL_TYPE_INTEGER_MENU:
1672                 if (min > max || def < min || def > max)
1673                         return -ERANGE;
1674                 /* Note: step == menu_skip_mask for menu controls.
1675                    So here we check if the default value is masked out. */
1676                 if (step && ((1 << def) & step))
1677                         return -EINVAL;
1678                 return 0;
1679         case V4L2_CTRL_TYPE_STRING:
1680                 if (min > max || min < 0 || step < 1 || def)
1681                         return -ERANGE;
1682                 return 0;
1683         default:
1684                 return 0;
1685         }
1686 }
1687
1688 /* Validate a new control */
1689 static int validate_new(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr p_new)
1690 {
1691         unsigned idx;
1692         int err = 0;
1693
1694         for (idx = 0; !err && idx < ctrl->elems; idx++)
1695                 err = ctrl->type_ops->validate(ctrl, idx, p_new);
1696         return err;
1697 }
1698
1699 static inline u32 node2id(struct list_head *node)
1700 {
1701         return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1702 }
1703
1704 /* Set the handler's error code if it wasn't set earlier already */
1705 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1706 {
1707         if (hdl->error == 0)
1708                 hdl->error = err;
1709         return err;
1710 }
1711
1712 /* Initialize the handler */
1713 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
1714                                  unsigned nr_of_controls_hint,
1715                                  struct lock_class_key *key, const char *name)
1716 {
1717         hdl->lock = &hdl->_lock;
1718         mutex_init(hdl->lock);
1719         lockdep_set_class_and_name(hdl->lock, key, name);
1720         INIT_LIST_HEAD(&hdl->ctrls);
1721         INIT_LIST_HEAD(&hdl->ctrl_refs);
1722         hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1723         hdl->buckets = kcalloc(hdl->nr_of_buckets, sizeof(hdl->buckets[0]),
1724                                GFP_KERNEL);
1725         hdl->error = hdl->buckets ? 0 : -ENOMEM;
1726         return hdl->error;
1727 }
1728 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
1729
1730 /* Free all controls and control refs */
1731 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1732 {
1733         struct v4l2_ctrl_ref *ref, *next_ref;
1734         struct v4l2_ctrl *ctrl, *next_ctrl;
1735         struct v4l2_subscribed_event *sev, *next_sev;
1736
1737         if (hdl == NULL || hdl->buckets == NULL)
1738                 return;
1739
1740         mutex_lock(hdl->lock);
1741         /* Free all nodes */
1742         list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1743                 list_del(&ref->node);
1744                 kfree(ref);
1745         }
1746         /* Free all controls owned by the handler */
1747         list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1748                 list_del(&ctrl->node);
1749                 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1750                         list_del(&sev->node);
1751                 kfree(ctrl);
1752         }
1753         kfree(hdl->buckets);
1754         hdl->buckets = NULL;
1755         hdl->cached = NULL;
1756         hdl->error = 0;
1757         mutex_unlock(hdl->lock);
1758 }
1759 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1760
1761 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1762    be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1763    with applications that do not use the NEXT_CTRL flag.
1764
1765    We just find the n-th private user control. It's O(N), but that should not
1766    be an issue in this particular case. */
1767 static struct v4l2_ctrl_ref *find_private_ref(
1768                 struct v4l2_ctrl_handler *hdl, u32 id)
1769 {
1770         struct v4l2_ctrl_ref *ref;
1771
1772         id -= V4L2_CID_PRIVATE_BASE;
1773         list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1774                 /* Search for private user controls that are compatible with
1775                    VIDIOC_G/S_CTRL. */
1776                 if (V4L2_CTRL_ID2WHICH(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1777                     V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1778                         if (!ref->ctrl->is_int)
1779                                 continue;
1780                         if (id == 0)
1781                                 return ref;
1782                         id--;
1783                 }
1784         }
1785         return NULL;
1786 }
1787
1788 /* Find a control with the given ID. */
1789 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1790 {
1791         struct v4l2_ctrl_ref *ref;
1792         int bucket;
1793
1794         id &= V4L2_CTRL_ID_MASK;
1795
1796         /* Old-style private controls need special handling */
1797         if (id >= V4L2_CID_PRIVATE_BASE)
1798                 return find_private_ref(hdl, id);
1799         bucket = id % hdl->nr_of_buckets;
1800
1801         /* Simple optimization: cache the last control found */
1802         if (hdl->cached && hdl->cached->ctrl->id == id)
1803                 return hdl->cached;
1804
1805         /* Not in cache, search the hash */
1806         ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1807         while (ref && ref->ctrl->id != id)
1808                 ref = ref->next;
1809
1810         if (ref)
1811                 hdl->cached = ref; /* cache it! */
1812         return ref;
1813 }
1814
1815 /* Find a control with the given ID. Take the handler's lock first. */
1816 static struct v4l2_ctrl_ref *find_ref_lock(
1817                 struct v4l2_ctrl_handler *hdl, u32 id)
1818 {
1819         struct v4l2_ctrl_ref *ref = NULL;
1820
1821         if (hdl) {
1822                 mutex_lock(hdl->lock);
1823                 ref = find_ref(hdl, id);
1824                 mutex_unlock(hdl->lock);
1825         }
1826         return ref;
1827 }
1828
1829 /* Find a control with the given ID. */
1830 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1831 {
1832         struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1833
1834         return ref ? ref->ctrl : NULL;
1835 }
1836 EXPORT_SYMBOL(v4l2_ctrl_find);
1837
1838 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1839 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1840                            struct v4l2_ctrl *ctrl)
1841 {
1842         struct v4l2_ctrl_ref *ref;
1843         struct v4l2_ctrl_ref *new_ref;
1844         u32 id = ctrl->id;
1845         u32 class_ctrl = V4L2_CTRL_ID2WHICH(id) | 1;
1846         int bucket = id % hdl->nr_of_buckets;   /* which bucket to use */
1847
1848         /*
1849          * Automatically add the control class if it is not yet present and
1850          * the new control is not a compound control.
1851          */
1852         if (ctrl->type < V4L2_CTRL_COMPOUND_TYPES &&
1853             id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1854                 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1855                         return hdl->error;
1856
1857         if (hdl->error)
1858                 return hdl->error;
1859
1860         new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1861         if (!new_ref)
1862                 return handler_set_err(hdl, -ENOMEM);
1863         new_ref->ctrl = ctrl;
1864         if (ctrl->handler == hdl) {
1865                 /* By default each control starts in a cluster of its own.
1866                    new_ref->ctrl is basically a cluster array with one
1867                    element, so that's perfect to use as the cluster pointer.
1868                    But only do this for the handler that owns the control. */
1869                 ctrl->cluster = &new_ref->ctrl;
1870                 ctrl->ncontrols = 1;
1871         }
1872
1873         INIT_LIST_HEAD(&new_ref->node);
1874
1875         mutex_lock(hdl->lock);
1876
1877         /* Add immediately at the end of the list if the list is empty, or if
1878            the last element in the list has a lower ID.
1879            This ensures that when elements are added in ascending order the
1880            insertion is an O(1) operation. */
1881         if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1882                 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1883                 goto insert_in_hash;
1884         }
1885
1886         /* Find insert position in sorted list */
1887         list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1888                 if (ref->ctrl->id < id)
1889                         continue;
1890                 /* Don't add duplicates */
1891                 if (ref->ctrl->id == id) {
1892                         kfree(new_ref);
1893                         goto unlock;
1894                 }
1895                 list_add(&new_ref->node, ref->node.prev);
1896                 break;
1897         }
1898
1899 insert_in_hash:
1900         /* Insert the control node in the hash */
1901         new_ref->next = hdl->buckets[bucket];
1902         hdl->buckets[bucket] = new_ref;
1903
1904 unlock:
1905         mutex_unlock(hdl->lock);
1906         return 0;
1907 }
1908
1909 /* Add a new control */
1910 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1911                         const struct v4l2_ctrl_ops *ops,
1912                         const struct v4l2_ctrl_type_ops *type_ops,
1913                         u32 id, const char *name, enum v4l2_ctrl_type type,
1914                         s64 min, s64 max, u64 step, s64 def,
1915                         const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size,
1916                         u32 flags, const char * const *qmenu,
1917                         const s64 *qmenu_int, void *priv)
1918 {
1919         struct v4l2_ctrl *ctrl;
1920         unsigned sz_extra;
1921         unsigned nr_of_dims = 0;
1922         unsigned elems = 1;
1923         bool is_array;
1924         unsigned tot_ctrl_size;
1925         unsigned idx;
1926         void *data;
1927         int err;
1928
1929         if (hdl->error)
1930                 return NULL;
1931
1932         while (dims && dims[nr_of_dims]) {
1933                 elems *= dims[nr_of_dims];
1934                 nr_of_dims++;
1935                 if (nr_of_dims == V4L2_CTRL_MAX_DIMS)
1936                         break;
1937         }
1938         is_array = nr_of_dims > 0;
1939
1940         /* Prefill elem_size for all types handled by std_type_ops */
1941         switch (type) {
1942         case V4L2_CTRL_TYPE_INTEGER64:
1943                 elem_size = sizeof(s64);
1944                 break;
1945         case V4L2_CTRL_TYPE_STRING:
1946                 elem_size = max + 1;
1947                 break;
1948         case V4L2_CTRL_TYPE_U8:
1949                 elem_size = sizeof(u8);
1950                 break;
1951         case V4L2_CTRL_TYPE_U16:
1952                 elem_size = sizeof(u16);
1953                 break;
1954         case V4L2_CTRL_TYPE_U32:
1955                 elem_size = sizeof(u32);
1956                 break;
1957         default:
1958                 if (type < V4L2_CTRL_COMPOUND_TYPES)
1959                         elem_size = sizeof(s32);
1960                 break;
1961         }
1962         tot_ctrl_size = elem_size * elems;
1963
1964         /* Sanity checks */
1965         if (id == 0 || name == NULL || !elem_size ||
1966             id >= V4L2_CID_PRIVATE_BASE ||
1967             (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1968             (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
1969                 handler_set_err(hdl, -ERANGE);
1970                 return NULL;
1971         }
1972         err = check_range(type, min, max, step, def);
1973         if (err) {
1974                 handler_set_err(hdl, err);
1975                 return NULL;
1976         }
1977         if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
1978                 handler_set_err(hdl, -ERANGE);
1979                 return NULL;
1980         }
1981         if (is_array &&
1982             (type == V4L2_CTRL_TYPE_BUTTON ||
1983              type == V4L2_CTRL_TYPE_CTRL_CLASS)) {
1984                 handler_set_err(hdl, -EINVAL);
1985                 return NULL;
1986         }
1987
1988         sz_extra = 0;
1989         if (type == V4L2_CTRL_TYPE_BUTTON)
1990                 flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1991                         V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1992         else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
1993                 flags |= V4L2_CTRL_FLAG_READ_ONLY;
1994         else if (type == V4L2_CTRL_TYPE_INTEGER64 ||
1995                  type == V4L2_CTRL_TYPE_STRING ||
1996                  type >= V4L2_CTRL_COMPOUND_TYPES ||
1997                  is_array)
1998                 sz_extra += 2 * tot_ctrl_size;
1999
2000         ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
2001         if (ctrl == NULL) {
2002                 handler_set_err(hdl, -ENOMEM);
2003                 return NULL;
2004         }
2005
2006         INIT_LIST_HEAD(&ctrl->node);
2007         INIT_LIST_HEAD(&ctrl->ev_subs);
2008         ctrl->handler = hdl;
2009         ctrl->ops = ops;
2010         ctrl->type_ops = type_ops ? type_ops : &std_type_ops;
2011         ctrl->id = id;
2012         ctrl->name = name;
2013         ctrl->type = type;
2014         ctrl->flags = flags;
2015         ctrl->minimum = min;
2016         ctrl->maximum = max;
2017         ctrl->step = step;
2018         ctrl->default_value = def;
2019         ctrl->is_string = !is_array && type == V4L2_CTRL_TYPE_STRING;
2020         ctrl->is_ptr = is_array || type >= V4L2_CTRL_COMPOUND_TYPES || ctrl->is_string;
2021         ctrl->is_int = !ctrl->is_ptr && type != V4L2_CTRL_TYPE_INTEGER64;
2022         ctrl->is_array = is_array;
2023         ctrl->elems = elems;
2024         ctrl->nr_of_dims = nr_of_dims;
2025         if (nr_of_dims)
2026                 memcpy(ctrl->dims, dims, nr_of_dims * sizeof(dims[0]));
2027         ctrl->elem_size = elem_size;
2028         if (type == V4L2_CTRL_TYPE_MENU)
2029                 ctrl->qmenu = qmenu;
2030         else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2031                 ctrl->qmenu_int = qmenu_int;
2032         ctrl->priv = priv;
2033         ctrl->cur.val = ctrl->val = def;
2034         data = &ctrl[1];
2035
2036         if (!ctrl->is_int) {
2037                 ctrl->p_new.p = data;
2038                 ctrl->p_cur.p = data + tot_ctrl_size;
2039         } else {
2040                 ctrl->p_new.p = &ctrl->val;
2041                 ctrl->p_cur.p = &ctrl->cur.val;
2042         }
2043         for (idx = 0; idx < elems; idx++) {
2044                 ctrl->type_ops->init(ctrl, idx, ctrl->p_cur);
2045                 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2046         }
2047
2048         if (handler_new_ref(hdl, ctrl)) {
2049                 kfree(ctrl);
2050                 return NULL;
2051         }
2052         mutex_lock(hdl->lock);
2053         list_add_tail(&ctrl->node, &hdl->ctrls);
2054         mutex_unlock(hdl->lock);
2055         return ctrl;
2056 }
2057
2058 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
2059                         const struct v4l2_ctrl_config *cfg, void *priv)
2060 {
2061         bool is_menu;
2062         struct v4l2_ctrl *ctrl;
2063         const char *name = cfg->name;
2064         const char * const *qmenu = cfg->qmenu;
2065         const s64 *qmenu_int = cfg->qmenu_int;
2066         enum v4l2_ctrl_type type = cfg->type;
2067         u32 flags = cfg->flags;
2068         s64 min = cfg->min;
2069         s64 max = cfg->max;
2070         u64 step = cfg->step;
2071         s64 def = cfg->def;
2072
2073         if (name == NULL)
2074                 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
2075                                                                 &def, &flags);
2076
2077         is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU ||
2078                    cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU);
2079         if (is_menu)
2080                 WARN_ON(step);
2081         else
2082                 WARN_ON(cfg->menu_skip_mask);
2083         if (cfg->type == V4L2_CTRL_TYPE_MENU && qmenu == NULL)
2084                 qmenu = v4l2_ctrl_get_menu(cfg->id);
2085         else if (cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU &&
2086                  qmenu_int == NULL) {
2087                 handler_set_err(hdl, -EINVAL);
2088                 return NULL;
2089         }
2090
2091         ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->type_ops, cfg->id, name,
2092                         type, min, max,
2093                         is_menu ? cfg->menu_skip_mask : step, def,
2094                         cfg->dims, cfg->elem_size,
2095                         flags, qmenu, qmenu_int, priv);
2096         if (ctrl)
2097                 ctrl->is_private = cfg->is_private;
2098         return ctrl;
2099 }
2100 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
2101
2102 /* Helper function for standard non-menu controls */
2103 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
2104                         const struct v4l2_ctrl_ops *ops,
2105                         u32 id, s64 min, s64 max, u64 step, s64 def)
2106 {
2107         const char *name;
2108         enum v4l2_ctrl_type type;
2109         u32 flags;
2110
2111         v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2112         if (type == V4L2_CTRL_TYPE_MENU ||
2113             type == V4L2_CTRL_TYPE_INTEGER_MENU ||
2114             type >= V4L2_CTRL_COMPOUND_TYPES) {
2115                 handler_set_err(hdl, -EINVAL);
2116                 return NULL;
2117         }
2118         return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2119                              min, max, step, def, NULL, 0,
2120                              flags, NULL, NULL, NULL);
2121 }
2122 EXPORT_SYMBOL(v4l2_ctrl_new_std);
2123
2124 /* Helper function for standard menu controls */
2125 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
2126                         const struct v4l2_ctrl_ops *ops,
2127                         u32 id, u8 _max, u64 mask, u8 _def)
2128 {
2129         const char * const *qmenu = NULL;
2130         const s64 *qmenu_int = NULL;
2131         unsigned int qmenu_int_len = 0;
2132         const char *name;
2133         enum v4l2_ctrl_type type;
2134         s64 min;
2135         s64 max = _max;
2136         s64 def = _def;
2137         u64 step;
2138         u32 flags;
2139
2140         v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2141
2142         if (type == V4L2_CTRL_TYPE_MENU)
2143                 qmenu = v4l2_ctrl_get_menu(id);
2144         else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2145                 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
2146
2147         if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
2148                 handler_set_err(hdl, -EINVAL);
2149                 return NULL;
2150         }
2151         return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2152                              0, max, mask, def, NULL, 0,
2153                              flags, qmenu, qmenu_int, NULL);
2154 }
2155 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
2156
2157 /* Helper function for standard menu controls with driver defined menu */
2158 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
2159                         const struct v4l2_ctrl_ops *ops, u32 id, u8 _max,
2160                         u64 mask, u8 _def, const char * const *qmenu)
2161 {
2162         enum v4l2_ctrl_type type;
2163         const char *name;
2164         u32 flags;
2165         u64 step;
2166         s64 min;
2167         s64 max = _max;
2168         s64 def = _def;
2169
2170         /* v4l2_ctrl_new_std_menu_items() should only be called for
2171          * standard controls without a standard menu.
2172          */
2173         if (v4l2_ctrl_get_menu(id)) {
2174                 handler_set_err(hdl, -EINVAL);
2175                 return NULL;
2176         }
2177
2178         v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2179         if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
2180                 handler_set_err(hdl, -EINVAL);
2181                 return NULL;
2182         }
2183         return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2184                              0, max, mask, def, NULL, 0,
2185                              flags, qmenu, NULL, NULL);
2186
2187 }
2188 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
2189
2190 /* Helper function for standard integer menu controls */
2191 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
2192                         const struct v4l2_ctrl_ops *ops,
2193                         u32 id, u8 _max, u8 _def, const s64 *qmenu_int)
2194 {
2195         const char *name;
2196         enum v4l2_ctrl_type type;
2197         s64 min;
2198         u64 step;
2199         s64 max = _max;
2200         s64 def = _def;
2201         u32 flags;
2202
2203         v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2204         if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
2205                 handler_set_err(hdl, -EINVAL);
2206                 return NULL;
2207         }
2208         return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2209                              0, max, 0, def, NULL, 0,
2210                              flags, NULL, qmenu_int, NULL);
2211 }
2212 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
2213
2214 /* Add a control from another handler to this handler */
2215 struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
2216                                           struct v4l2_ctrl *ctrl)
2217 {
2218         if (hdl == NULL || hdl->error)
2219                 return NULL;
2220         if (ctrl == NULL) {
2221                 handler_set_err(hdl, -EINVAL);
2222                 return NULL;
2223         }
2224         if (ctrl->handler == hdl)
2225                 return ctrl;
2226         return handler_new_ref(hdl, ctrl) ? NULL : ctrl;
2227 }
2228 EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
2229
2230 /* Add the controls from another handler to our own. */
2231 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
2232                           struct v4l2_ctrl_handler *add,
2233                           bool (*filter)(const struct v4l2_ctrl *ctrl))
2234 {
2235         struct v4l2_ctrl_ref *ref;
2236         int ret = 0;
2237
2238         /* Do nothing if either handler is NULL or if they are the same */
2239         if (!hdl || !add || hdl == add)
2240                 return 0;
2241         if (hdl->error)
2242                 return hdl->error;
2243         mutex_lock(add->lock);
2244         list_for_each_entry(ref, &add->ctrl_refs, node) {
2245                 struct v4l2_ctrl *ctrl = ref->ctrl;
2246
2247                 /* Skip handler-private controls. */
2248                 if (ctrl->is_private)
2249                         continue;
2250                 /* And control classes */
2251                 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2252                         continue;
2253                 /* Filter any unwanted controls */
2254                 if (filter && !filter(ctrl))
2255                         continue;
2256                 ret = handler_new_ref(hdl, ctrl);
2257                 if (ret)
2258                         break;
2259         }
2260         mutex_unlock(add->lock);
2261         return ret;
2262 }
2263 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
2264
2265 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
2266 {
2267         if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
2268                 return true;
2269         if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
2270                 return true;
2271         switch (ctrl->id) {
2272         case V4L2_CID_AUDIO_MUTE:
2273         case V4L2_CID_AUDIO_VOLUME:
2274         case V4L2_CID_AUDIO_BALANCE:
2275         case V4L2_CID_AUDIO_BASS:
2276         case V4L2_CID_AUDIO_TREBLE:
2277         case V4L2_CID_AUDIO_LOUDNESS:
2278                 return true;
2279         default:
2280                 break;
2281         }
2282         return false;
2283 }
2284 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
2285
2286 /* Cluster controls */
2287 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
2288 {
2289         bool has_volatiles = false;
2290         int i;
2291
2292         /* The first control is the master control and it must not be NULL */
2293         if (WARN_ON(ncontrols == 0 || controls[0] == NULL))
2294                 return;
2295
2296         for (i = 0; i < ncontrols; i++) {
2297                 if (controls[i]) {
2298                         controls[i]->cluster = controls;
2299                         controls[i]->ncontrols = ncontrols;
2300                         if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
2301                                 has_volatiles = true;
2302                 }
2303         }
2304         controls[0]->has_volatiles = has_volatiles;
2305 }
2306 EXPORT_SYMBOL(v4l2_ctrl_cluster);
2307
2308 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
2309                             u8 manual_val, bool set_volatile)
2310 {
2311         struct v4l2_ctrl *master = controls[0];
2312         u32 flag = 0;
2313         int i;
2314
2315         v4l2_ctrl_cluster(ncontrols, controls);
2316         WARN_ON(ncontrols <= 1);
2317         WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
2318         WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
2319         master->is_auto = true;
2320         master->has_volatiles = set_volatile;
2321         master->manual_mode_value = manual_val;
2322         master->flags |= V4L2_CTRL_FLAG_UPDATE;
2323
2324         if (!is_cur_manual(master))
2325                 flag = V4L2_CTRL_FLAG_INACTIVE |
2326                         (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
2327
2328         for (i = 1; i < ncontrols; i++)
2329                 if (controls[i])
2330                         controls[i]->flags |= flag;
2331 }
2332 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
2333
2334 /* Activate/deactivate a control. */
2335 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
2336 {
2337         /* invert since the actual flag is called 'inactive' */
2338         bool inactive = !active;
2339         bool old;
2340
2341         if (ctrl == NULL)
2342                 return;
2343
2344         if (inactive)
2345                 /* set V4L2_CTRL_FLAG_INACTIVE */
2346                 old = test_and_set_bit(4, &ctrl->flags);
2347         else
2348                 /* clear V4L2_CTRL_FLAG_INACTIVE */
2349                 old = test_and_clear_bit(4, &ctrl->flags);
2350         if (old != inactive)
2351                 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2352 }
2353 EXPORT_SYMBOL(v4l2_ctrl_activate);
2354
2355 /* Grab/ungrab a control.
2356    Typically used when streaming starts and you want to grab controls,
2357    preventing the user from changing them.
2358
2359    Just call this and the framework will block any attempts to change
2360    these controls. */
2361 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
2362 {
2363         bool old;
2364
2365         if (ctrl == NULL)
2366                 return;
2367
2368         v4l2_ctrl_lock(ctrl);
2369         if (grabbed)
2370                 /* set V4L2_CTRL_FLAG_GRABBED */
2371                 old = test_and_set_bit(1, &ctrl->flags);
2372         else
2373                 /* clear V4L2_CTRL_FLAG_GRABBED */
2374                 old = test_and_clear_bit(1, &ctrl->flags);
2375         if (old != grabbed)
2376                 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2377         v4l2_ctrl_unlock(ctrl);
2378 }
2379 EXPORT_SYMBOL(v4l2_ctrl_grab);
2380
2381 /* Log the control name and value */
2382 static void log_ctrl(const struct v4l2_ctrl *ctrl,
2383                      const char *prefix, const char *colon)
2384 {
2385         if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
2386                 return;
2387         if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2388                 return;
2389
2390         pr_info("%s%s%s: ", prefix, colon, ctrl->name);
2391
2392         ctrl->type_ops->log(ctrl);
2393
2394         if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
2395                            V4L2_CTRL_FLAG_GRABBED |
2396                            V4L2_CTRL_FLAG_VOLATILE)) {
2397                 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
2398                         pr_cont(" inactive");
2399                 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
2400                         pr_cont(" grabbed");
2401                 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
2402                         pr_cont(" volatile");
2403         }
2404         pr_cont("\n");
2405 }
2406
2407 /* Log all controls owned by the handler */
2408 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
2409                                   const char *prefix)
2410 {
2411         struct v4l2_ctrl *ctrl;
2412         const char *colon = "";
2413         int len;
2414
2415         if (hdl == NULL)
2416                 return;
2417         if (prefix == NULL)
2418                 prefix = "";
2419         len = strlen(prefix);
2420         if (len && prefix[len - 1] != ' ')
2421                 colon = ": ";
2422         mutex_lock(hdl->lock);
2423         list_for_each_entry(ctrl, &hdl->ctrls, node)
2424                 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
2425                         log_ctrl(ctrl, prefix, colon);
2426         mutex_unlock(hdl->lock);
2427 }
2428 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
2429
2430 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
2431 {
2432         v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
2433         return 0;
2434 }
2435 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
2436
2437 /* Call s_ctrl for all controls owned by the handler */
2438 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2439 {
2440         struct v4l2_ctrl *ctrl;
2441         int ret = 0;
2442
2443         if (hdl == NULL)
2444                 return 0;
2445         mutex_lock(hdl->lock);
2446         list_for_each_entry(ctrl, &hdl->ctrls, node)
2447                 ctrl->done = false;
2448
2449         list_for_each_entry(ctrl, &hdl->ctrls, node) {
2450                 struct v4l2_ctrl *master = ctrl->cluster[0];
2451                 int i;
2452
2453                 /* Skip if this control was already handled by a cluster. */
2454                 /* Skip button controls and read-only controls. */
2455                 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
2456                     (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
2457                         continue;
2458
2459                 for (i = 0; i < master->ncontrols; i++) {
2460                         if (master->cluster[i]) {
2461                                 cur_to_new(master->cluster[i]);
2462                                 master->cluster[i]->is_new = 1;
2463                                 master->cluster[i]->done = true;
2464                         }
2465                 }
2466                 ret = call_op(master, s_ctrl);
2467                 if (ret)
2468                         break;
2469         }
2470         mutex_unlock(hdl->lock);
2471         return ret;
2472 }
2473 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
2474
2475 /* Implement VIDIOC_QUERY_EXT_CTRL */
2476 int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc)
2477 {
2478         const unsigned next_flags = V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
2479         u32 id = qc->id & V4L2_CTRL_ID_MASK;
2480         struct v4l2_ctrl_ref *ref;
2481         struct v4l2_ctrl *ctrl;
2482
2483         if (hdl == NULL)
2484                 return -EINVAL;
2485
2486         mutex_lock(hdl->lock);
2487
2488         /* Try to find it */
2489         ref = find_ref(hdl, id);
2490
2491         if ((qc->id & next_flags) && !list_empty(&hdl->ctrl_refs)) {
2492                 bool is_compound;
2493                 /* Match any control that is not hidden */
2494                 unsigned mask = 1;
2495                 bool match = false;
2496
2497                 if ((qc->id & next_flags) == V4L2_CTRL_FLAG_NEXT_COMPOUND) {
2498                         /* Match any hidden control */
2499                         match = true;
2500                 } else if ((qc->id & next_flags) == next_flags) {
2501                         /* Match any control, compound or not */
2502                         mask = 0;
2503                 }
2504
2505                 /* Find the next control with ID > qc->id */
2506
2507                 /* Did we reach the end of the control list? */
2508                 if (id >= node2id(hdl->ctrl_refs.prev)) {
2509                         ref = NULL; /* Yes, so there is no next control */
2510                 } else if (ref) {
2511                         /* We found a control with the given ID, so just get
2512                            the next valid one in the list. */
2513                         list_for_each_entry_continue(ref, &hdl->ctrl_refs, node) {
2514                                 is_compound = ref->ctrl->is_array ||
2515                                         ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2516                                 if (id < ref->ctrl->id &&
2517                                     (is_compound & mask) == match)
2518                                         break;
2519                         }
2520                         if (&ref->node == &hdl->ctrl_refs)
2521                                 ref = NULL;
2522                 } else {
2523                         /* No control with the given ID exists, so start
2524                            searching for the next largest ID. We know there
2525                            is one, otherwise the first 'if' above would have
2526                            been true. */
2527                         list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2528                                 is_compound = ref->ctrl->is_array ||
2529                                         ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2530                                 if (id < ref->ctrl->id &&
2531                                     (is_compound & mask) == match)
2532                                         break;
2533                         }
2534                         if (&ref->node == &hdl->ctrl_refs)
2535                                 ref = NULL;
2536                 }
2537         }
2538         mutex_unlock(hdl->lock);
2539
2540         if (!ref)
2541                 return -EINVAL;
2542
2543         ctrl = ref->ctrl;
2544         memset(qc, 0, sizeof(*qc));
2545         if (id >= V4L2_CID_PRIVATE_BASE)
2546                 qc->id = id;
2547         else
2548                 qc->id = ctrl->id;
2549         strlcpy(qc->name, ctrl->name, sizeof(qc->name));
2550         qc->flags = ctrl->flags;
2551         qc->type = ctrl->type;
2552         if (ctrl->is_ptr)
2553                 qc->flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
2554         qc->elem_size = ctrl->elem_size;
2555         qc->elems = ctrl->elems;
2556         qc->nr_of_dims = ctrl->nr_of_dims;
2557         memcpy(qc->dims, ctrl->dims, qc->nr_of_dims * sizeof(qc->dims[0]));
2558         qc->minimum = ctrl->minimum;
2559         qc->maximum = ctrl->maximum;
2560         qc->default_value = ctrl->default_value;
2561         if (ctrl->type == V4L2_CTRL_TYPE_MENU
2562             || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
2563                 qc->step = 1;
2564         else
2565                 qc->step = ctrl->step;
2566         return 0;
2567 }
2568 EXPORT_SYMBOL(v4l2_query_ext_ctrl);
2569
2570 /* Implement VIDIOC_QUERYCTRL */
2571 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
2572 {
2573         struct v4l2_query_ext_ctrl qec = { qc->id };
2574         int rc;
2575
2576         rc = v4l2_query_ext_ctrl(hdl, &qec);
2577         if (rc)
2578                 return rc;
2579
2580         qc->id = qec.id;
2581         qc->type = qec.type;
2582         qc->flags = qec.flags;
2583         strlcpy(qc->name, qec.name, sizeof(qc->name));
2584         switch (qc->type) {
2585         case V4L2_CTRL_TYPE_INTEGER:
2586         case V4L2_CTRL_TYPE_BOOLEAN:
2587         case V4L2_CTRL_TYPE_MENU:
2588         case V4L2_CTRL_TYPE_INTEGER_MENU:
2589         case V4L2_CTRL_TYPE_STRING:
2590         case V4L2_CTRL_TYPE_BITMASK:
2591                 qc->minimum = qec.minimum;
2592                 qc->maximum = qec.maximum;
2593                 qc->step = qec.step;
2594                 qc->default_value = qec.default_value;
2595                 break;
2596         default:
2597                 qc->minimum = 0;
2598                 qc->maximum = 0;
2599                 qc->step = 0;
2600                 qc->default_value = 0;
2601                 break;
2602         }
2603         return 0;
2604 }
2605 EXPORT_SYMBOL(v4l2_queryctrl);
2606
2607 int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
2608 {
2609         if (qc->id & (V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND))
2610                 return -EINVAL;
2611         return v4l2_queryctrl(sd->ctrl_handler, qc);
2612 }
2613 EXPORT_SYMBOL(v4l2_subdev_queryctrl);
2614
2615 /* Implement VIDIOC_QUERYMENU */
2616 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2617 {
2618         struct v4l2_ctrl *ctrl;
2619         u32 i = qm->index;
2620
2621         ctrl = v4l2_ctrl_find(hdl, qm->id);
2622         if (!ctrl)
2623                 return -EINVAL;
2624
2625         qm->reserved = 0;
2626         /* Sanity checks */
2627         switch (ctrl->type) {
2628         case V4L2_CTRL_TYPE_MENU:
2629                 if (ctrl->qmenu == NULL)
2630                         return -EINVAL;
2631                 break;
2632         case V4L2_CTRL_TYPE_INTEGER_MENU:
2633                 if (ctrl->qmenu_int == NULL)
2634                         return -EINVAL;
2635                 break;
2636         default:
2637                 return -EINVAL;
2638         }
2639
2640         if (i < ctrl->minimum || i > ctrl->maximum)
2641                 return -EINVAL;
2642
2643         /* Use mask to see if this menu item should be skipped */
2644         if (ctrl->menu_skip_mask & (1 << i))
2645                 return -EINVAL;
2646         /* Empty menu items should also be skipped */
2647         if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2648                 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2649                         return -EINVAL;
2650                 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2651         } else {
2652                 qm->value = ctrl->qmenu_int[i];
2653         }
2654         return 0;
2655 }
2656 EXPORT_SYMBOL(v4l2_querymenu);
2657
2658 int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
2659 {
2660         return v4l2_querymenu(sd->ctrl_handler, qm);
2661 }
2662 EXPORT_SYMBOL(v4l2_subdev_querymenu);
2663
2664
2665
2666 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
2667
2668    It is not a fully atomic operation, just best-effort only. After all, if
2669    multiple controls have to be set through multiple i2c writes (for example)
2670    then some initial writes may succeed while others fail. Thus leaving the
2671    system in an inconsistent state. The question is how much effort you are
2672    willing to spend on trying to make something atomic that really isn't.
2673
2674    From the point of view of an application the main requirement is that
2675    when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
2676    error should be returned without actually affecting any controls.
2677
2678    If all the values are correct, then it is acceptable to just give up
2679    in case of low-level errors.
2680
2681    It is important though that the application can tell when only a partial
2682    configuration was done. The way we do that is through the error_idx field
2683    of struct v4l2_ext_controls: if that is equal to the count field then no
2684    controls were affected. Otherwise all controls before that index were
2685    successful in performing their 'get' or 'set' operation, the control at
2686    the given index failed, and you don't know what happened with the controls
2687    after the failed one. Since if they were part of a control cluster they
2688    could have been successfully processed (if a cluster member was encountered
2689    at index < error_idx), they could have failed (if a cluster member was at
2690    error_idx), or they may not have been processed yet (if the first cluster
2691    member appeared after error_idx).
2692
2693    It is all fairly theoretical, though. In practice all you can do is to
2694    bail out. If error_idx == count, then it is an application bug. If
2695    error_idx < count then it is only an application bug if the error code was
2696    EBUSY. That usually means that something started streaming just when you
2697    tried to set the controls. In all other cases it is a driver/hardware
2698    problem and all you can do is to retry or bail out.
2699
2700    Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
2701    never modifies controls the error_idx is just set to whatever control
2702    has an invalid value.
2703  */
2704
2705 /* Prepare for the extended g/s/try functions.
2706    Find the controls in the control array and do some basic checks. */
2707 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
2708                              struct v4l2_ext_controls *cs,
2709                              struct v4l2_ctrl_helper *helpers,
2710                              bool get)
2711 {
2712         struct v4l2_ctrl_helper *h;
2713         bool have_clusters = false;
2714         u32 i;
2715
2716         for (i = 0, h = helpers; i < cs->count; i++, h++) {
2717                 struct v4l2_ext_control *c = &cs->controls[i];
2718                 struct v4l2_ctrl_ref *ref;
2719                 struct v4l2_ctrl *ctrl;
2720                 u32 id = c->id & V4L2_CTRL_ID_MASK;
2721
2722                 cs->error_idx = i;
2723
2724                 if (cs->which &&
2725                     cs->which != V4L2_CTRL_WHICH_DEF_VAL &&
2726                     V4L2_CTRL_ID2WHICH(id) != cs->which)
2727                         return -EINVAL;
2728
2729                 /* Old-style private controls are not allowed for
2730                    extended controls */
2731                 if (id >= V4L2_CID_PRIVATE_BASE)
2732                         return -EINVAL;
2733                 ref = find_ref_lock(hdl, id);
2734                 if (ref == NULL)
2735                         return -EINVAL;
2736                 ctrl = ref->ctrl;
2737                 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
2738                         return -EINVAL;
2739
2740                 if (ctrl->cluster[0]->ncontrols > 1)
2741                         have_clusters = true;
2742                 if (ctrl->cluster[0] != ctrl)
2743                         ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
2744                 if (ctrl->is_ptr && !ctrl->is_string) {
2745                         unsigned tot_size = ctrl->elems * ctrl->elem_size;
2746
2747                         if (c->size < tot_size) {
2748                                 if (get) {
2749                                         c->size = tot_size;
2750                                         return -ENOSPC;
2751                                 }
2752                                 return -EFAULT;
2753                         }
2754                         c->size = tot_size;
2755                 }
2756                 /* Store the ref to the master control of the cluster */
2757                 h->mref = ref;
2758                 h->ctrl = ctrl;
2759                 /* Initially set next to 0, meaning that there is no other
2760                    control in this helper array belonging to the same
2761                    cluster */
2762                 h->next = 0;
2763         }
2764
2765         /* We are done if there were no controls that belong to a multi-
2766            control cluster. */
2767         if (!have_clusters)
2768                 return 0;
2769
2770         /* The code below figures out in O(n) time which controls in the list
2771            belong to the same cluster. */
2772
2773         /* This has to be done with the handler lock taken. */
2774         mutex_lock(hdl->lock);
2775
2776         /* First zero the helper field in the master control references */
2777         for (i = 0; i < cs->count; i++)
2778                 helpers[i].mref->helper = NULL;
2779         for (i = 0, h = helpers; i < cs->count; i++, h++) {
2780                 struct v4l2_ctrl_ref *mref = h->mref;
2781
2782                 /* If the mref->helper is set, then it points to an earlier
2783                    helper that belongs to the same cluster. */
2784                 if (mref->helper) {
2785                         /* Set the next field of mref->helper to the current
2786                            index: this means that that earlier helper now
2787                            points to the next helper in the same cluster. */
2788                         mref->helper->next = i;
2789                         /* mref should be set only for the first helper in the
2790                            cluster, clear the others. */
2791                         h->mref = NULL;
2792                 }
2793                 /* Point the mref helper to the current helper struct. */
2794                 mref->helper = h;
2795         }
2796         mutex_unlock(hdl->lock);
2797         return 0;
2798 }
2799
2800 /* Handles the corner case where cs->count == 0. It checks whether the
2801    specified control class exists. If that class ID is 0, then it checks
2802    whether there are any controls at all. */
2803 static int class_check(struct v4l2_ctrl_handler *hdl, u32 which)
2804 {
2805         if (which == 0 || which == V4L2_CTRL_WHICH_DEF_VAL)
2806                 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
2807         return find_ref_lock(hdl, which | 1) ? 0 : -EINVAL;
2808 }
2809
2810
2811
2812 /* Get extended controls. Allocates the helpers array if needed. */
2813 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2814 {
2815         struct v4l2_ctrl_helper helper[4];
2816         struct v4l2_ctrl_helper *helpers = helper;
2817         int ret;
2818         int i, j;
2819         bool def_value;
2820
2821         def_value = (cs->which == V4L2_CTRL_WHICH_DEF_VAL);
2822
2823         cs->error_idx = cs->count;
2824         cs->which = V4L2_CTRL_ID2WHICH(cs->which);
2825
2826         if (hdl == NULL)
2827                 return -EINVAL;
2828
2829         if (cs->count == 0)
2830                 return class_check(hdl, cs->which);
2831
2832         if (cs->count > ARRAY_SIZE(helper)) {
2833                 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2834                                         GFP_KERNEL);
2835                 if (helpers == NULL)
2836                         return -ENOMEM;
2837         }
2838
2839         ret = prepare_ext_ctrls(hdl, cs, helpers, true);
2840         cs->error_idx = cs->count;
2841
2842         for (i = 0; !ret && i < cs->count; i++)
2843                 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2844                         ret = -EACCES;
2845
2846         for (i = 0; !ret && i < cs->count; i++) {
2847                 int (*ctrl_to_user)(struct v4l2_ext_control *c,
2848                                     struct v4l2_ctrl *ctrl);
2849                 struct v4l2_ctrl *master;
2850
2851                 ctrl_to_user = def_value ? def_to_user : cur_to_user;
2852
2853                 if (helpers[i].mref == NULL)
2854                         continue;
2855
2856                 master = helpers[i].mref->ctrl;
2857                 cs->error_idx = i;
2858
2859                 v4l2_ctrl_lock(master);
2860
2861                 /* g_volatile_ctrl will update the new control values */
2862                 if (!def_value &&
2863                     ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
2864                     (master->has_volatiles && !is_cur_manual(master)))) {
2865                         for (j = 0; j < master->ncontrols; j++)
2866                                 cur_to_new(master->cluster[j]);
2867                         ret = call_op(master, g_volatile_ctrl);
2868                         ctrl_to_user = new_to_user;
2869                 }
2870                 /* If OK, then copy the current (for non-volatile controls)
2871                    or the new (for volatile controls) control values to the
2872                    caller */
2873                 if (!ret) {
2874                         u32 idx = i;
2875
2876                         do {
2877                                 ret = ctrl_to_user(cs->controls + idx,
2878                                                    helpers[idx].ctrl);
2879                                 idx = helpers[idx].next;
2880                         } while (!ret && idx);
2881                 }
2882                 v4l2_ctrl_unlock(master);
2883         }
2884
2885         if (cs->count > ARRAY_SIZE(helper))
2886                 kfree(helpers);
2887         return ret;
2888 }
2889 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2890
2891 int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2892 {
2893         return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
2894 }
2895 EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
2896
2897 /* Helper function to get a single control */
2898 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
2899 {
2900         struct v4l2_ctrl *master = ctrl->cluster[0];
2901         int ret = 0;
2902         int i;
2903
2904         /* Compound controls are not supported. The new_to_user() and
2905          * cur_to_user() calls below would need to be modified not to access
2906          * userspace memory when called from get_ctrl().
2907          */
2908         if (!ctrl->is_int && ctrl->type != V4L2_CTRL_TYPE_INTEGER64)
2909                 return -EINVAL;
2910
2911         if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2912                 return -EACCES;
2913
2914         v4l2_ctrl_lock(master);
2915         /* g_volatile_ctrl will update the current control values */
2916         if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2917                 for (i = 0; i < master->ncontrols; i++)
2918                         cur_to_new(master->cluster[i]);
2919                 ret = call_op(master, g_volatile_ctrl);
2920                 new_to_user(c, ctrl);
2921         } else {
2922                 cur_to_user(c, ctrl);
2923         }
2924         v4l2_ctrl_unlock(master);
2925         return ret;
2926 }
2927
2928 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2929 {
2930         struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2931         struct v4l2_ext_control c;
2932         int ret;
2933
2934         if (ctrl == NULL || !ctrl->is_int)
2935                 return -EINVAL;
2936         ret = get_ctrl(ctrl, &c);
2937         control->value = c.value;
2938         return ret;
2939 }
2940 EXPORT_SYMBOL(v4l2_g_ctrl);
2941
2942 int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2943 {
2944         return v4l2_g_ctrl(sd->ctrl_handler, control);
2945 }
2946 EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
2947
2948 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2949 {
2950         struct v4l2_ext_control c;
2951
2952         /* It's a driver bug if this happens. */
2953         WARN_ON(!ctrl->is_int);
2954         c.value = 0;
2955         get_ctrl(ctrl, &c);
2956         return c.value;
2957 }
2958 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2959
2960 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
2961 {
2962         struct v4l2_ext_control c;
2963
2964         /* It's a driver bug if this happens. */
2965         WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2966         c.value64 = 0;
2967         get_ctrl(ctrl, &c);
2968         return c.value64;
2969 }
2970 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
2971
2972
2973 /* Core function that calls try/s_ctrl and ensures that the new value is
2974    copied to the current value on a set.
2975    Must be called with ctrl->handler->lock held. */
2976 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
2977                               bool set, u32 ch_flags)
2978 {
2979         bool update_flag;
2980         int ret;
2981         int i;
2982
2983         /* Go through the cluster and either validate the new value or
2984            (if no new value was set), copy the current value to the new
2985            value, ensuring a consistent view for the control ops when
2986            called. */
2987         for (i = 0; i < master->ncontrols; i++) {
2988                 struct v4l2_ctrl *ctrl = master->cluster[i];
2989
2990                 if (ctrl == NULL)
2991                         continue;
2992
2993                 if (!ctrl->is_new) {
2994                         cur_to_new(ctrl);
2995                         continue;
2996                 }
2997                 /* Check again: it may have changed since the
2998                    previous check in try_or_set_ext_ctrls(). */
2999                 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3000                         return -EBUSY;
3001         }
3002
3003         ret = call_op(master, try_ctrl);
3004
3005         /* Don't set if there is no change */
3006         if (ret || !set || !cluster_changed(master))
3007                 return ret;
3008         ret = call_op(master, s_ctrl);
3009         if (ret)
3010                 return ret;
3011
3012         /* If OK, then make the new values permanent. */
3013         update_flag = is_cur_manual(master) != is_new_manual(master);
3014         for (i = 0; i < master->ncontrols; i++)
3015                 new_to_cur(fh, master->cluster[i], ch_flags |
3016                         ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
3017         return 0;
3018 }
3019
3020 /* Validate controls. */
3021 static int validate_ctrls(struct v4l2_ext_controls *cs,
3022                           struct v4l2_ctrl_helper *helpers, bool set)
3023 {
3024         unsigned i;
3025         int ret = 0;
3026
3027         cs->error_idx = cs->count;
3028         for (i = 0; i < cs->count; i++) {
3029                 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
3030                 union v4l2_ctrl_ptr p_new;
3031
3032                 cs->error_idx = i;
3033
3034                 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3035                         return -EACCES;
3036                 /* This test is also done in try_set_control_cluster() which
3037                    is called in atomic context, so that has the final say,
3038                    but it makes sense to do an up-front check as well. Once
3039                    an error occurs in try_set_control_cluster() some other
3040                    controls may have been set already and we want to do a
3041                    best-effort to avoid that. */
3042                 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3043                         return -EBUSY;
3044                 /*
3045                  * Skip validation for now if the payload needs to be copied
3046                  * from userspace into kernelspace. We'll validate those later.
3047                  */
3048                 if (ctrl->is_ptr)
3049                         continue;
3050                 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3051                         p_new.p_s64 = &cs->controls[i].value64;
3052                 else
3053                         p_new.p_s32 = &cs->controls[i].value;
3054                 ret = validate_new(ctrl, p_new);
3055                 if (ret)
3056                         return ret;
3057         }
3058         return 0;
3059 }
3060
3061 /* Obtain the current volatile values of an autocluster and mark them
3062    as new. */
3063 static void update_from_auto_cluster(struct v4l2_ctrl *master)
3064 {
3065         int i;
3066
3067         for (i = 1; i < master->ncontrols; i++)
3068                 cur_to_new(master->cluster[i]);
3069         if (!call_op(master, g_volatile_ctrl))
3070                 for (i = 1; i < master->ncontrols; i++)
3071                         if (master->cluster[i])
3072                                 master->cluster[i]->is_new = 1;
3073 }
3074
3075 /* Try or try-and-set controls */
3076 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3077                              struct v4l2_ext_controls *cs,
3078                              bool set)
3079 {
3080         struct v4l2_ctrl_helper helper[4];
3081         struct v4l2_ctrl_helper *helpers = helper;
3082         unsigned i, j;
3083         int ret;
3084
3085         cs->error_idx = cs->count;
3086
3087         /* Default value cannot be changed */
3088         if (cs->which == V4L2_CTRL_WHICH_DEF_VAL)
3089                 return -EINVAL;
3090
3091         cs->which = V4L2_CTRL_ID2WHICH(cs->which);
3092
3093         if (hdl == NULL)
3094                 return -EINVAL;
3095
3096         if (cs->count == 0)
3097                 return class_check(hdl, cs->which);
3098
3099         if (cs->count > ARRAY_SIZE(helper)) {
3100                 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
3101                                         GFP_KERNEL);
3102                 if (!helpers)
3103                         return -ENOMEM;
3104         }
3105         ret = prepare_ext_ctrls(hdl, cs, helpers, false);
3106         if (!ret)
3107                 ret = validate_ctrls(cs, helpers, set);
3108         if (ret && set)
3109                 cs->error_idx = cs->count;
3110         for (i = 0; !ret && i < cs->count; i++) {
3111                 struct v4l2_ctrl *master;
3112                 u32 idx = i;
3113
3114                 if (helpers[i].mref == NULL)
3115                         continue;
3116
3117                 cs->error_idx = i;
3118                 master = helpers[i].mref->ctrl;
3119                 v4l2_ctrl_lock(master);
3120
3121                 /* Reset the 'is_new' flags of the cluster */
3122                 for (j = 0; j < master->ncontrols; j++)
3123                         if (master->cluster[j])
3124                                 master->cluster[j]->is_new = 0;
3125
3126                 /* For volatile autoclusters that are currently in auto mode
3127                    we need to discover if it will be set to manual mode.
3128                    If so, then we have to copy the current volatile values
3129                    first since those will become the new manual values (which
3130                    may be overwritten by explicit new values from this set
3131                    of controls). */
3132                 if (master->is_auto && master->has_volatiles &&
3133                                                 !is_cur_manual(master)) {
3134                         /* Pick an initial non-manual value */
3135                         s32 new_auto_val = master->manual_mode_value + 1;
3136                         u32 tmp_idx = idx;
3137
3138                         do {
3139                                 /* Check if the auto control is part of the
3140                                    list, and remember the new value. */
3141                                 if (helpers[tmp_idx].ctrl == master)
3142                                         new_auto_val = cs->controls[tmp_idx].value;
3143                                 tmp_idx = helpers[tmp_idx].next;
3144                         } while (tmp_idx);
3145                         /* If the new value == the manual value, then copy
3146                            the current volatile values. */
3147                         if (new_auto_val == master->manual_mode_value)
3148                                 update_from_auto_cluster(master);
3149                 }
3150
3151                 /* Copy the new caller-supplied control values.
3152                    user_to_new() sets 'is_new' to 1. */
3153                 do {
3154                         struct v4l2_ctrl *ctrl = helpers[idx].ctrl;
3155
3156                         ret = user_to_new(cs->controls + idx, ctrl);
3157                         if (!ret && ctrl->is_ptr)
3158                                 ret = validate_new(ctrl, ctrl->p_new);
3159                         idx = helpers[idx].next;
3160                 } while (!ret && idx);
3161
3162                 if (!ret)
3163                         ret = try_or_set_cluster(fh, master, set, 0);
3164
3165                 /* Copy the new values back to userspace. */
3166                 if (!ret) {
3167                         idx = i;
3168                         do {
3169                                 ret = new_to_user(cs->controls + idx,
3170                                                 helpers[idx].ctrl);
3171                                 idx = helpers[idx].next;
3172                         } while (!ret && idx);
3173                 }
3174                 v4l2_ctrl_unlock(master);
3175         }
3176
3177         if (cs->count > ARRAY_SIZE(helper))
3178                 kfree(helpers);
3179         return ret;
3180 }
3181
3182 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
3183 {
3184         return try_set_ext_ctrls(NULL, hdl, cs, false);
3185 }
3186 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
3187
3188 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3189                                         struct v4l2_ext_controls *cs)
3190 {
3191         return try_set_ext_ctrls(fh, hdl, cs, true);
3192 }
3193 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
3194
3195 int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
3196 {
3197         return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, false);
3198 }
3199 EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
3200
3201 int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
3202 {
3203         return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, true);
3204 }
3205 EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
3206
3207 /* Helper function for VIDIOC_S_CTRL compatibility */
3208 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
3209 {
3210         struct v4l2_ctrl *master = ctrl->cluster[0];
3211         int ret;
3212         int i;
3213
3214         /* Reset the 'is_new' flags of the cluster */
3215         for (i = 0; i < master->ncontrols; i++)
3216                 if (master->cluster[i])
3217                         master->cluster[i]->is_new = 0;
3218
3219         ret = validate_new(ctrl, ctrl->p_new);
3220         if (ret)
3221                 return ret;
3222
3223         /* For autoclusters with volatiles that are switched from auto to
3224            manual mode we have to update the current volatile values since
3225            those will become the initial manual values after such a switch. */
3226         if (master->is_auto && master->has_volatiles && ctrl == master &&
3227             !is_cur_manual(master) && ctrl->val == master->manual_mode_value)
3228                 update_from_auto_cluster(master);
3229
3230         ctrl->is_new = 1;
3231         return try_or_set_cluster(fh, master, true, ch_flags);
3232 }
3233
3234 /* Helper function for VIDIOC_S_CTRL compatibility */
3235 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
3236                          struct v4l2_ext_control *c)
3237 {
3238         int ret;
3239
3240         v4l2_ctrl_lock(ctrl);
3241         user_to_new(c, ctrl);
3242         ret = set_ctrl(fh, ctrl, 0);
3243         if (!ret)
3244                 cur_to_user(c, ctrl);
3245         v4l2_ctrl_unlock(ctrl);
3246         return ret;
3247 }
3248
3249 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3250                                         struct v4l2_control *control)
3251 {
3252         struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3253         struct v4l2_ext_control c = { control->id };
3254         int ret;
3255
3256         if (ctrl == NULL || !ctrl->is_int)
3257                 return -EINVAL;
3258
3259         if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3260                 return -EACCES;
3261
3262         c.value = control->value;
3263         ret = set_ctrl_lock(fh, ctrl, &c);
3264         control->value = c.value;
3265         return ret;
3266 }
3267 EXPORT_SYMBOL(v4l2_s_ctrl);
3268
3269 int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
3270 {
3271         return v4l2_s_ctrl(NULL, sd->ctrl_handler, control);
3272 }
3273 EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
3274
3275 int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
3276 {
3277         lockdep_assert_held(ctrl->handler->lock);
3278
3279         /* It's a driver bug if this happens. */
3280         WARN_ON(!ctrl->is_int);
3281         ctrl->val = val;
3282         return set_ctrl(NULL, ctrl, 0);
3283 }
3284 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl);
3285
3286 int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
3287 {
3288         lockdep_assert_held(ctrl->handler->lock);
3289
3290         /* It's a driver bug if this happens. */
3291         WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3292         *ctrl->p_new.p_s64 = val;
3293         return set_ctrl(NULL, ctrl, 0);
3294 }
3295 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_int64);
3296
3297 int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
3298 {
3299         lockdep_assert_held(ctrl->handler->lock);
3300
3301         /* It's a driver bug if this happens. */
3302         WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING);
3303         strlcpy(ctrl->p_new.p_char, s, ctrl->maximum + 1);
3304         return set_ctrl(NULL, ctrl, 0);
3305 }
3306 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_string);
3307
3308 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
3309 {
3310         if (ctrl == NULL)
3311                 return;
3312         if (notify == NULL) {
3313                 ctrl->call_notify = 0;
3314                 return;
3315         }
3316         if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
3317                 return;
3318         ctrl->handler->notify = notify;
3319         ctrl->handler->notify_priv = priv;
3320         ctrl->call_notify = 1;
3321 }
3322 EXPORT_SYMBOL(v4l2_ctrl_notify);
3323
3324 int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
3325                         s64 min, s64 max, u64 step, s64 def)
3326 {
3327         bool value_changed;
3328         bool range_changed = false;
3329         int ret;
3330
3331         lockdep_assert_held(ctrl->handler->lock);
3332
3333         switch (ctrl->type) {
3334         case V4L2_CTRL_TYPE_INTEGER:
3335         case V4L2_CTRL_TYPE_INTEGER64:
3336         case V4L2_CTRL_TYPE_BOOLEAN:
3337         case V4L2_CTRL_TYPE_MENU:
3338         case V4L2_CTRL_TYPE_INTEGER_MENU:
3339         case V4L2_CTRL_TYPE_BITMASK:
3340         case V4L2_CTRL_TYPE_U8:
3341         case V4L2_CTRL_TYPE_U16:
3342         case V4L2_CTRL_TYPE_U32:
3343                 if (ctrl->is_array)
3344                         return -EINVAL;
3345                 ret = check_range(ctrl->type, min, max, step, def);
3346                 if (ret)
3347                         return ret;
3348                 break;
3349         default:
3350                 return -EINVAL;
3351         }
3352         if ((ctrl->minimum != min) || (ctrl->maximum != max) ||
3353                 (ctrl->step != step) || ctrl->default_value != def) {
3354                 range_changed = true;
3355                 ctrl->minimum = min;
3356                 ctrl->maximum = max;
3357                 ctrl->step = step;
3358                 ctrl->default_value = def;
3359         }
3360         cur_to_new(ctrl);
3361         if (validate_new(ctrl, ctrl->p_new)) {
3362                 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3363                         *ctrl->p_new.p_s64 = def;
3364                 else
3365                         *ctrl->p_new.p_s32 = def;
3366         }
3367
3368         if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3369                 value_changed = *ctrl->p_new.p_s64 != *ctrl->p_cur.p_s64;
3370         else
3371                 value_changed = *ctrl->p_new.p_s32 != *ctrl->p_cur.p_s32;
3372         if (value_changed)
3373                 ret = set_ctrl(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3374         else if (range_changed)
3375                 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3376         return ret;
3377 }
3378 EXPORT_SYMBOL(__v4l2_ctrl_modify_range);
3379
3380 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
3381 {
3382         struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3383
3384         if (ctrl == NULL)
3385                 return -EINVAL;
3386
3387         v4l2_ctrl_lock(ctrl);
3388         list_add_tail(&sev->node, &ctrl->ev_subs);
3389         if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
3390             (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
3391                 struct v4l2_event ev;
3392                 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
3393
3394                 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
3395                         changes |= V4L2_EVENT_CTRL_CH_VALUE;
3396                 fill_event(&ev, ctrl, changes);
3397                 /* Mark the queue as active, allowing this initial
3398                    event to be accepted. */
3399                 sev->elems = elems;
3400                 v4l2_event_queue_fh(sev->fh, &ev);
3401         }
3402         v4l2_ctrl_unlock(ctrl);
3403         return 0;
3404 }
3405
3406 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
3407 {
3408         struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3409
3410         v4l2_ctrl_lock(ctrl);
3411         list_del(&sev->node);
3412         v4l2_ctrl_unlock(ctrl);
3413 }
3414
3415 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
3416 {
3417         u32 old_changes = old->u.ctrl.changes;
3418
3419         old->u.ctrl = new->u.ctrl;
3420         old->u.ctrl.changes |= old_changes;
3421 }
3422 EXPORT_SYMBOL(v4l2_ctrl_replace);
3423
3424 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
3425 {
3426         new->u.ctrl.changes |= old->u.ctrl.changes;
3427 }
3428 EXPORT_SYMBOL(v4l2_ctrl_merge);
3429
3430 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
3431         .add = v4l2_ctrl_add_event,
3432         .del = v4l2_ctrl_del_event,
3433         .replace = v4l2_ctrl_replace,
3434         .merge = v4l2_ctrl_merge,
3435 };
3436 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
3437
3438 int v4l2_ctrl_log_status(struct file *file, void *fh)
3439 {
3440         struct video_device *vfd = video_devdata(file);
3441         struct v4l2_fh *vfh = file->private_data;
3442
3443         if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
3444                 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
3445                         vfd->v4l2_dev->name);
3446         return 0;
3447 }
3448 EXPORT_SYMBOL(v4l2_ctrl_log_status);
3449
3450 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
3451                                 const struct v4l2_event_subscription *sub)
3452 {
3453         if (sub->type == V4L2_EVENT_CTRL)
3454                 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
3455         return -EINVAL;
3456 }
3457 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
3458
3459 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
3460                                      struct v4l2_event_subscription *sub)
3461 {
3462         if (!sd->ctrl_handler)
3463                 return -EINVAL;
3464         return v4l2_ctrl_subscribe_event(fh, sub);
3465 }
3466 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
3467
3468 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
3469 {
3470         struct v4l2_fh *fh = file->private_data;
3471
3472         if (v4l2_event_pending(fh))
3473                 return POLLPRI;
3474         poll_wait(file, &fh->wait, wait);
3475         return 0;
3476 }
3477 EXPORT_SYMBOL(v4l2_ctrl_poll);