kernel/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 caller-provider value to the given control value */
1495 static int user_to_ptr(struct v4l2_ext_control *c,
1496                        struct v4l2_ctrl *ctrl,
1497                        union v4l2_ctrl_ptr ptr)
1498 {
1499         int ret;
1500         u32 size;
1501
1502         ctrl->is_new = 1;
1503         if (ctrl->is_ptr && !ctrl->is_string) {
1504                 unsigned idx;
1505
1506                 ret = copy_from_user(ptr.p, c->ptr, c->size) ? -EFAULT : 0;
1507                 if (ret || !ctrl->is_array)
1508                         return ret;
1509                 for (idx = c->size / ctrl->elem_size; idx < ctrl->elems; idx++)
1510                         ctrl->type_ops->init(ctrl, idx, ptr);
1511                 return 0;
1512         }
1513
1514         switch (ctrl->type) {
1515         case V4L2_CTRL_TYPE_INTEGER64:
1516                 *ptr.p_s64 = c->value64;
1517                 break;
1518         case V4L2_CTRL_TYPE_STRING:
1519                 size = c->size;
1520                 if (size == 0)
1521                         return -ERANGE;
1522                 if (size > ctrl->maximum + 1)
1523                         size = ctrl->maximum + 1;
1524                 ret = copy_from_user(ptr.p_char, c->string, size) ? -EFAULT : 0;
1525                 if (!ret) {
1526                         char last = ptr.p_char[size - 1];
1527
1528                         ptr.p_char[size - 1] = 0;
1529                         /* If the string was longer than ctrl->maximum,
1530                            then return an error. */
1531                         if (strlen(ptr.p_char) == ctrl->maximum && last)
1532                                 return -ERANGE;
1533                 }
1534                 return ret;
1535         default:
1536                 *ptr.p_s32 = c->value;
1537                 break;
1538         }
1539         return 0;
1540 }
1541
1542 /* Helper function: copy the caller-provider value as the new control value */
1543 static int user_to_new(struct v4l2_ext_control *c,
1544                        struct v4l2_ctrl *ctrl)
1545 {
1546         return user_to_ptr(c, ctrl, ctrl->p_new);
1547 }
1548
1549 /* Copy the one value to another. */
1550 static void ptr_to_ptr(struct v4l2_ctrl *ctrl,
1551                        union v4l2_ctrl_ptr from, union v4l2_ctrl_ptr to)
1552 {
1553         if (ctrl == NULL)
1554                 return;
1555         memcpy(to.p, from.p, ctrl->elems * ctrl->elem_size);
1556 }
1557
1558 /* Copy the new value to the current value. */
1559 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
1560 {
1561         bool changed;
1562
1563         if (ctrl == NULL)
1564                 return;
1565
1566         /* has_changed is set by cluster_changed */
1567         changed = ctrl->has_changed;
1568         if (changed)
1569                 ptr_to_ptr(ctrl, ctrl->p_new, ctrl->p_cur);
1570
1571         if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
1572                 /* Note: CH_FLAGS is only set for auto clusters. */
1573                 ctrl->flags &=
1574                         ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1575                 if (!is_cur_manual(ctrl->cluster[0])) {
1576                         ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1577                         if (ctrl->cluster[0]->has_volatiles)
1578                                 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1579                 }
1580                 fh = NULL;
1581         }
1582         if (changed || ch_flags) {
1583                 /* If a control was changed that was not one of the controls
1584                    modified by the application, then send the event to all. */
1585                 if (!ctrl->is_new)
1586                         fh = NULL;
1587                 send_event(fh, ctrl,
1588                         (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
1589                 if (ctrl->call_notify && changed && ctrl->handler->notify)
1590                         ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
1591         }
1592 }
1593
1594 /* Copy the current value to the new value */
1595 static void cur_to_new(struct v4l2_ctrl *ctrl)
1596 {
1597         if (ctrl == NULL)
1598                 return;
1599         ptr_to_ptr(ctrl, ctrl->p_cur, ctrl->p_new);
1600 }
1601
1602 /* Return non-zero if one or more of the controls in the cluster has a new
1603    value that differs from the current value. */
1604 static int cluster_changed(struct v4l2_ctrl *master)
1605 {
1606         bool changed = false;
1607         unsigned idx;
1608         int i;
1609
1610         for (i = 0; i < master->ncontrols; i++) {
1611                 struct v4l2_ctrl *ctrl = master->cluster[i];
1612                 bool ctrl_changed = false;
1613
1614                 if (ctrl == NULL)
1615                         continue;
1616
1617                 if (ctrl->flags & V4L2_CTRL_FLAG_EXECUTE_ON_WRITE)
1618                         changed = ctrl_changed = true;
1619
1620                 /*
1621                  * Set has_changed to false to avoid generating
1622                  * the event V4L2_EVENT_CTRL_CH_VALUE
1623                  */
1624                 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
1625                         ctrl->has_changed = false;
1626                         continue;
1627                 }
1628
1629                 for (idx = 0; !ctrl_changed && idx < ctrl->elems; idx++)
1630                         ctrl_changed = !ctrl->type_ops->equal(ctrl, idx,
1631                                 ctrl->p_cur, ctrl->p_new);
1632                 ctrl->has_changed = ctrl_changed;
1633                 changed |= ctrl->has_changed;
1634         }
1635         return changed;
1636 }
1637
1638 /* Control range checking */
1639 static int check_range(enum v4l2_ctrl_type type,
1640                 s64 min, s64 max, u64 step, s64 def)
1641 {
1642         switch (type) {
1643         case V4L2_CTRL_TYPE_BOOLEAN:
1644                 if (step != 1 || max > 1 || min < 0)
1645                         return -ERANGE;
1646                 /* fall through */
1647         case V4L2_CTRL_TYPE_U8:
1648         case V4L2_CTRL_TYPE_U16:
1649         case V4L2_CTRL_TYPE_U32:
1650         case V4L2_CTRL_TYPE_INTEGER:
1651         case V4L2_CTRL_TYPE_INTEGER64:
1652                 if (step == 0 || min > max || def < min || def > max)
1653                         return -ERANGE;
1654                 return 0;
1655         case V4L2_CTRL_TYPE_BITMASK:
1656                 if (step || min || !max || (def & ~max))
1657                         return -ERANGE;
1658                 return 0;
1659         case V4L2_CTRL_TYPE_MENU:
1660         case V4L2_CTRL_TYPE_INTEGER_MENU:
1661                 if (min > max || def < min || def > max)
1662                         return -ERANGE;
1663                 /* Note: step == menu_skip_mask for menu controls.
1664                    So here we check if the default value is masked out. */
1665                 if (step && ((1 << def) & step))
1666                         return -EINVAL;
1667                 return 0;
1668         case V4L2_CTRL_TYPE_STRING:
1669                 if (min > max || min < 0 || step < 1 || def)
1670                         return -ERANGE;
1671                 return 0;
1672         default:
1673                 return 0;
1674         }
1675 }
1676
1677 /* Validate a new control */
1678 static int validate_new(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr p_new)
1679 {
1680         unsigned idx;
1681         int err = 0;
1682
1683         for (idx = 0; !err && idx < ctrl->elems; idx++)
1684                 err = ctrl->type_ops->validate(ctrl, idx, p_new);
1685         return err;
1686 }
1687
1688 static inline u32 node2id(struct list_head *node)
1689 {
1690         return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1691 }
1692
1693 /* Set the handler's error code if it wasn't set earlier already */
1694 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1695 {
1696         if (hdl->error == 0)
1697                 hdl->error = err;
1698         return err;
1699 }
1700
1701 /* Initialize the handler */
1702 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
1703                                  unsigned nr_of_controls_hint,
1704                                  struct lock_class_key *key, const char *name)
1705 {
1706         hdl->lock = &hdl->_lock;
1707         mutex_init(hdl->lock);
1708         lockdep_set_class_and_name(hdl->lock, key, name);
1709         INIT_LIST_HEAD(&hdl->ctrls);
1710         INIT_LIST_HEAD(&hdl->ctrl_refs);
1711         hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1712         hdl->buckets = kcalloc(hdl->nr_of_buckets, sizeof(hdl->buckets[0]),
1713                                GFP_KERNEL);
1714         hdl->error = hdl->buckets ? 0 : -ENOMEM;
1715         return hdl->error;
1716 }
1717 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
1718
1719 /* Free all controls and control refs */
1720 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1721 {
1722         struct v4l2_ctrl_ref *ref, *next_ref;
1723         struct v4l2_ctrl *ctrl, *next_ctrl;
1724         struct v4l2_subscribed_event *sev, *next_sev;
1725
1726         if (hdl == NULL || hdl->buckets == NULL)
1727                 return;
1728
1729         mutex_lock(hdl->lock);
1730         /* Free all nodes */
1731         list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1732                 list_del(&ref->node);
1733                 kfree(ref);
1734         }
1735         /* Free all controls owned by the handler */
1736         list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1737                 list_del(&ctrl->node);
1738                 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1739                         list_del(&sev->node);
1740                 kfree(ctrl);
1741         }
1742         kfree(hdl->buckets);
1743         hdl->buckets = NULL;
1744         hdl->cached = NULL;
1745         hdl->error = 0;
1746         mutex_unlock(hdl->lock);
1747 }
1748 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1749
1750 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1751    be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1752    with applications that do not use the NEXT_CTRL flag.
1753
1754    We just find the n-th private user control. It's O(N), but that should not
1755    be an issue in this particular case. */
1756 static struct v4l2_ctrl_ref *find_private_ref(
1757                 struct v4l2_ctrl_handler *hdl, u32 id)
1758 {
1759         struct v4l2_ctrl_ref *ref;
1760
1761         id -= V4L2_CID_PRIVATE_BASE;
1762         list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1763                 /* Search for private user controls that are compatible with
1764                    VIDIOC_G/S_CTRL. */
1765                 if (V4L2_CTRL_ID2CLASS(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1766                     V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1767                         if (!ref->ctrl->is_int)
1768                                 continue;
1769                         if (id == 0)
1770                                 return ref;
1771                         id--;
1772                 }
1773         }
1774         return NULL;
1775 }
1776
1777 /* Find a control with the given ID. */
1778 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1779 {
1780         struct v4l2_ctrl_ref *ref;
1781         int bucket;
1782
1783         id &= V4L2_CTRL_ID_MASK;
1784
1785         /* Old-style private controls need special handling */
1786         if (id >= V4L2_CID_PRIVATE_BASE)
1787                 return find_private_ref(hdl, id);
1788         bucket = id % hdl->nr_of_buckets;
1789
1790         /* Simple optimization: cache the last control found */
1791         if (hdl->cached && hdl->cached->ctrl->id == id)
1792                 return hdl->cached;
1793
1794         /* Not in cache, search the hash */
1795         ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1796         while (ref && ref->ctrl->id != id)
1797                 ref = ref->next;
1798
1799         if (ref)
1800                 hdl->cached = ref; /* cache it! */
1801         return ref;
1802 }
1803
1804 /* Find a control with the given ID. Take the handler's lock first. */
1805 static struct v4l2_ctrl_ref *find_ref_lock(
1806                 struct v4l2_ctrl_handler *hdl, u32 id)
1807 {
1808         struct v4l2_ctrl_ref *ref = NULL;
1809
1810         if (hdl) {
1811                 mutex_lock(hdl->lock);
1812                 ref = find_ref(hdl, id);
1813                 mutex_unlock(hdl->lock);
1814         }
1815         return ref;
1816 }
1817
1818 /* Find a control with the given ID. */
1819 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1820 {
1821         struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1822
1823         return ref ? ref->ctrl : NULL;
1824 }
1825 EXPORT_SYMBOL(v4l2_ctrl_find);
1826
1827 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1828 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1829                            struct v4l2_ctrl *ctrl)
1830 {
1831         struct v4l2_ctrl_ref *ref;
1832         struct v4l2_ctrl_ref *new_ref;
1833         u32 id = ctrl->id;
1834         u32 class_ctrl = V4L2_CTRL_ID2CLASS(id) | 1;
1835         int bucket = id % hdl->nr_of_buckets;   /* which bucket to use */
1836
1837         /*
1838          * Automatically add the control class if it is not yet present and
1839          * the new control is not a compound control.
1840          */
1841         if (ctrl->type < V4L2_CTRL_COMPOUND_TYPES &&
1842             id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1843                 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1844                         return hdl->error;
1845
1846         if (hdl->error)
1847                 return hdl->error;
1848
1849         new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1850         if (!new_ref)
1851                 return handler_set_err(hdl, -ENOMEM);
1852         new_ref->ctrl = ctrl;
1853         if (ctrl->handler == hdl) {
1854                 /* By default each control starts in a cluster of its own.
1855                    new_ref->ctrl is basically a cluster array with one
1856                    element, so that's perfect to use as the cluster pointer.
1857                    But only do this for the handler that owns the control. */
1858                 ctrl->cluster = &new_ref->ctrl;
1859                 ctrl->ncontrols = 1;
1860         }
1861
1862         INIT_LIST_HEAD(&new_ref->node);
1863
1864         mutex_lock(hdl->lock);
1865
1866         /* Add immediately at the end of the list if the list is empty, or if
1867            the last element in the list has a lower ID.
1868            This ensures that when elements are added in ascending order the
1869            insertion is an O(1) operation. */
1870         if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1871                 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1872                 goto insert_in_hash;
1873         }
1874
1875         /* Find insert position in sorted list */
1876         list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1877                 if (ref->ctrl->id < id)
1878                         continue;
1879                 /* Don't add duplicates */
1880                 if (ref->ctrl->id == id) {
1881                         kfree(new_ref);
1882                         goto unlock;
1883                 }
1884                 list_add(&new_ref->node, ref->node.prev);
1885                 break;
1886         }
1887
1888 insert_in_hash:
1889         /* Insert the control node in the hash */
1890         new_ref->next = hdl->buckets[bucket];
1891         hdl->buckets[bucket] = new_ref;
1892
1893 unlock:
1894         mutex_unlock(hdl->lock);
1895         return 0;
1896 }
1897
1898 /* Add a new control */
1899 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1900                         const struct v4l2_ctrl_ops *ops,
1901                         const struct v4l2_ctrl_type_ops *type_ops,
1902                         u32 id, const char *name, enum v4l2_ctrl_type type,
1903                         s64 min, s64 max, u64 step, s64 def,
1904                         const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size,
1905                         u32 flags, const char * const *qmenu,
1906                         const s64 *qmenu_int, void *priv)
1907 {
1908         struct v4l2_ctrl *ctrl;
1909         unsigned sz_extra;
1910         unsigned nr_of_dims = 0;
1911         unsigned elems = 1;
1912         bool is_array;
1913         unsigned tot_ctrl_size;
1914         unsigned idx;
1915         void *data;
1916         int err;
1917
1918         if (hdl->error)
1919                 return NULL;
1920
1921         while (dims && dims[nr_of_dims]) {
1922                 elems *= dims[nr_of_dims];
1923                 nr_of_dims++;
1924                 if (nr_of_dims == V4L2_CTRL_MAX_DIMS)
1925                         break;
1926         }
1927         is_array = nr_of_dims > 0;
1928
1929         /* Prefill elem_size for all types handled by std_type_ops */
1930         switch (type) {
1931         case V4L2_CTRL_TYPE_INTEGER64:
1932                 elem_size = sizeof(s64);
1933                 break;
1934         case V4L2_CTRL_TYPE_STRING:
1935                 elem_size = max + 1;
1936                 break;
1937         case V4L2_CTRL_TYPE_U8:
1938                 elem_size = sizeof(u8);
1939                 break;
1940         case V4L2_CTRL_TYPE_U16:
1941                 elem_size = sizeof(u16);
1942                 break;
1943         case V4L2_CTRL_TYPE_U32:
1944                 elem_size = sizeof(u32);
1945                 break;
1946         default:
1947                 if (type < V4L2_CTRL_COMPOUND_TYPES)
1948                         elem_size = sizeof(s32);
1949                 break;
1950         }
1951         tot_ctrl_size = elem_size * elems;
1952
1953         /* Sanity checks */
1954         if (id == 0 || name == NULL || !elem_size ||
1955             id >= V4L2_CID_PRIVATE_BASE ||
1956             (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1957             (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
1958                 handler_set_err(hdl, -ERANGE);
1959                 return NULL;
1960         }
1961         err = check_range(type, min, max, step, def);
1962         if (err) {
1963                 handler_set_err(hdl, err);
1964                 return NULL;
1965         }
1966         if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
1967                 handler_set_err(hdl, -ERANGE);
1968                 return NULL;
1969         }
1970         if (is_array &&
1971             (type == V4L2_CTRL_TYPE_BUTTON ||
1972              type == V4L2_CTRL_TYPE_CTRL_CLASS)) {
1973                 handler_set_err(hdl, -EINVAL);
1974                 return NULL;
1975         }
1976
1977         sz_extra = 0;
1978         if (type == V4L2_CTRL_TYPE_BUTTON)
1979                 flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1980                         V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1981         else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
1982                 flags |= V4L2_CTRL_FLAG_READ_ONLY;
1983         else if (type == V4L2_CTRL_TYPE_INTEGER64 ||
1984                  type == V4L2_CTRL_TYPE_STRING ||
1985                  type >= V4L2_CTRL_COMPOUND_TYPES ||
1986                  is_array)
1987                 sz_extra += 2 * tot_ctrl_size;
1988
1989         ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
1990         if (ctrl == NULL) {
1991                 handler_set_err(hdl, -ENOMEM);
1992                 return NULL;
1993         }
1994
1995         INIT_LIST_HEAD(&ctrl->node);
1996         INIT_LIST_HEAD(&ctrl->ev_subs);
1997         ctrl->handler = hdl;
1998         ctrl->ops = ops;
1999         ctrl->type_ops = type_ops ? type_ops : &std_type_ops;
2000         ctrl->id = id;
2001         ctrl->name = name;
2002         ctrl->type = type;
2003         ctrl->flags = flags;
2004         ctrl->minimum = min;
2005         ctrl->maximum = max;
2006         ctrl->step = step;
2007         ctrl->default_value = def;
2008         ctrl->is_string = !is_array && type == V4L2_CTRL_TYPE_STRING;
2009         ctrl->is_ptr = is_array || type >= V4L2_CTRL_COMPOUND_TYPES || ctrl->is_string;
2010         ctrl->is_int = !ctrl->is_ptr && type != V4L2_CTRL_TYPE_INTEGER64;
2011         ctrl->is_array = is_array;
2012         ctrl->elems = elems;
2013         ctrl->nr_of_dims = nr_of_dims;
2014         if (nr_of_dims)
2015                 memcpy(ctrl->dims, dims, nr_of_dims * sizeof(dims[0]));
2016         ctrl->elem_size = elem_size;
2017         if (type == V4L2_CTRL_TYPE_MENU)
2018                 ctrl->qmenu = qmenu;
2019         else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2020                 ctrl->qmenu_int = qmenu_int;
2021         ctrl->priv = priv;
2022         ctrl->cur.val = ctrl->val = def;
2023         data = &ctrl[1];
2024
2025         if (!ctrl->is_int) {
2026                 ctrl->p_new.p = data;
2027                 ctrl->p_cur.p = data + tot_ctrl_size;
2028         } else {
2029                 ctrl->p_new.p = &ctrl->val;
2030                 ctrl->p_cur.p = &ctrl->cur.val;
2031         }
2032         for (idx = 0; idx < elems; idx++) {
2033                 ctrl->type_ops->init(ctrl, idx, ctrl->p_cur);
2034                 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2035         }
2036
2037         if (handler_new_ref(hdl, ctrl)) {
2038                 kfree(ctrl);
2039                 return NULL;
2040         }
2041         mutex_lock(hdl->lock);
2042         list_add_tail(&ctrl->node, &hdl->ctrls);
2043         mutex_unlock(hdl->lock);
2044         return ctrl;
2045 }
2046
2047 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
2048                         const struct v4l2_ctrl_config *cfg, void *priv)
2049 {
2050         bool is_menu;
2051         struct v4l2_ctrl *ctrl;
2052         const char *name = cfg->name;
2053         const char * const *qmenu = cfg->qmenu;
2054         const s64 *qmenu_int = cfg->qmenu_int;
2055         enum v4l2_ctrl_type type = cfg->type;
2056         u32 flags = cfg->flags;
2057         s64 min = cfg->min;
2058         s64 max = cfg->max;
2059         u64 step = cfg->step;
2060         s64 def = cfg->def;
2061
2062         if (name == NULL)
2063                 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
2064                                                                 &def, &flags);
2065
2066         is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU ||
2067                    cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU);
2068         if (is_menu)
2069                 WARN_ON(step);
2070         else
2071                 WARN_ON(cfg->menu_skip_mask);
2072         if (cfg->type == V4L2_CTRL_TYPE_MENU && qmenu == NULL)
2073                 qmenu = v4l2_ctrl_get_menu(cfg->id);
2074         else if (cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU &&
2075                  qmenu_int == NULL) {
2076                 handler_set_err(hdl, -EINVAL);
2077                 return NULL;
2078         }
2079
2080         ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->type_ops, cfg->id, name,
2081                         type, min, max,
2082                         is_menu ? cfg->menu_skip_mask : step, def,
2083                         cfg->dims, cfg->elem_size,
2084                         flags, qmenu, qmenu_int, priv);
2085         if (ctrl)
2086                 ctrl->is_private = cfg->is_private;
2087         return ctrl;
2088 }
2089 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
2090
2091 /* Helper function for standard non-menu controls */
2092 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
2093                         const struct v4l2_ctrl_ops *ops,
2094                         u32 id, s64 min, s64 max, u64 step, s64 def)
2095 {
2096         const char *name;
2097         enum v4l2_ctrl_type type;
2098         u32 flags;
2099
2100         v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2101         if (type == V4L2_CTRL_TYPE_MENU ||
2102             type == V4L2_CTRL_TYPE_INTEGER_MENU ||
2103             type >= V4L2_CTRL_COMPOUND_TYPES) {
2104                 handler_set_err(hdl, -EINVAL);
2105                 return NULL;
2106         }
2107         return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2108                              min, max, step, def, NULL, 0,
2109                              flags, NULL, NULL, NULL);
2110 }
2111 EXPORT_SYMBOL(v4l2_ctrl_new_std);
2112
2113 /* Helper function for standard menu controls */
2114 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
2115                         const struct v4l2_ctrl_ops *ops,
2116                         u32 id, u8 _max, u64 mask, u8 _def)
2117 {
2118         const char * const *qmenu = NULL;
2119         const s64 *qmenu_int = NULL;
2120         unsigned int qmenu_int_len = 0;
2121         const char *name;
2122         enum v4l2_ctrl_type type;
2123         s64 min;
2124         s64 max = _max;
2125         s64 def = _def;
2126         u64 step;
2127         u32 flags;
2128
2129         v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2130
2131         if (type == V4L2_CTRL_TYPE_MENU)
2132                 qmenu = v4l2_ctrl_get_menu(id);
2133         else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2134                 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
2135
2136         if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
2137                 handler_set_err(hdl, -EINVAL);
2138                 return NULL;
2139         }
2140         return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2141                              0, max, mask, def, NULL, 0,
2142                              flags, qmenu, qmenu_int, NULL);
2143 }
2144 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
2145
2146 /* Helper function for standard menu controls with driver defined menu */
2147 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
2148                         const struct v4l2_ctrl_ops *ops, u32 id, u8 _max,
2149                         u64 mask, u8 _def, const char * const *qmenu)
2150 {
2151         enum v4l2_ctrl_type type;
2152         const char *name;
2153         u32 flags;
2154         u64 step;
2155         s64 min;
2156         s64 max = _max;
2157         s64 def = _def;
2158
2159         /* v4l2_ctrl_new_std_menu_items() should only be called for
2160          * standard controls without a standard menu.
2161          */
2162         if (v4l2_ctrl_get_menu(id)) {
2163                 handler_set_err(hdl, -EINVAL);
2164                 return NULL;
2165         }
2166
2167         v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2168         if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
2169                 handler_set_err(hdl, -EINVAL);
2170                 return NULL;
2171         }
2172         return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2173                              0, max, mask, def, NULL, 0,
2174                              flags, qmenu, NULL, NULL);
2175
2176 }
2177 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
2178
2179 /* Helper function for standard integer menu controls */
2180 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
2181                         const struct v4l2_ctrl_ops *ops,
2182                         u32 id, u8 _max, u8 _def, const s64 *qmenu_int)
2183 {
2184         const char *name;
2185         enum v4l2_ctrl_type type;
2186         s64 min;
2187         u64 step;
2188         s64 max = _max;
2189         s64 def = _def;
2190         u32 flags;
2191
2192         v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2193         if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
2194                 handler_set_err(hdl, -EINVAL);
2195                 return NULL;
2196         }
2197         return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2198                              0, max, 0, def, NULL, 0,
2199                              flags, NULL, qmenu_int, NULL);
2200 }
2201 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
2202
2203 /* Add a control from another handler to this handler */
2204 struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
2205                                           struct v4l2_ctrl *ctrl)
2206 {
2207         if (hdl == NULL || hdl->error)
2208                 return NULL;
2209         if (ctrl == NULL) {
2210                 handler_set_err(hdl, -EINVAL);
2211                 return NULL;
2212         }
2213         if (ctrl->handler == hdl)
2214                 return ctrl;
2215         return handler_new_ref(hdl, ctrl) ? NULL : ctrl;
2216 }
2217 EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
2218
2219 /* Add the controls from another handler to our own. */
2220 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
2221                           struct v4l2_ctrl_handler *add,
2222                           bool (*filter)(const struct v4l2_ctrl *ctrl))
2223 {
2224         struct v4l2_ctrl_ref *ref;
2225         int ret = 0;
2226
2227         /* Do nothing if either handler is NULL or if they are the same */
2228         if (!hdl || !add || hdl == add)
2229                 return 0;
2230         if (hdl->error)
2231                 return hdl->error;
2232         mutex_lock(add->lock);
2233         list_for_each_entry(ref, &add->ctrl_refs, node) {
2234                 struct v4l2_ctrl *ctrl = ref->ctrl;
2235
2236                 /* Skip handler-private controls. */
2237                 if (ctrl->is_private)
2238                         continue;
2239                 /* And control classes */
2240                 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2241                         continue;
2242                 /* Filter any unwanted controls */
2243                 if (filter && !filter(ctrl))
2244                         continue;
2245                 ret = handler_new_ref(hdl, ctrl);
2246                 if (ret)
2247                         break;
2248         }
2249         mutex_unlock(add->lock);
2250         return ret;
2251 }
2252 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
2253
2254 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
2255 {
2256         if (V4L2_CTRL_ID2CLASS(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
2257                 return true;
2258         if (V4L2_CTRL_ID2CLASS(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
2259                 return true;
2260         switch (ctrl->id) {
2261         case V4L2_CID_AUDIO_MUTE:
2262         case V4L2_CID_AUDIO_VOLUME:
2263         case V4L2_CID_AUDIO_BALANCE:
2264         case V4L2_CID_AUDIO_BASS:
2265         case V4L2_CID_AUDIO_TREBLE:
2266         case V4L2_CID_AUDIO_LOUDNESS:
2267                 return true;
2268         default:
2269                 break;
2270         }
2271         return false;
2272 }
2273 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
2274
2275 /* Cluster controls */
2276 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
2277 {
2278         bool has_volatiles = false;
2279         int i;
2280
2281         /* The first control is the master control and it must not be NULL */
2282         if (WARN_ON(ncontrols == 0 || controls[0] == NULL))
2283                 return;
2284
2285         for (i = 0; i < ncontrols; i++) {
2286                 if (controls[i]) {
2287                         controls[i]->cluster = controls;
2288                         controls[i]->ncontrols = ncontrols;
2289                         if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
2290                                 has_volatiles = true;
2291                 }
2292         }
2293         controls[0]->has_volatiles = has_volatiles;
2294 }
2295 EXPORT_SYMBOL(v4l2_ctrl_cluster);
2296
2297 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
2298                             u8 manual_val, bool set_volatile)
2299 {
2300         struct v4l2_ctrl *master = controls[0];
2301         u32 flag = 0;
2302         int i;
2303
2304         v4l2_ctrl_cluster(ncontrols, controls);
2305         WARN_ON(ncontrols <= 1);
2306         WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
2307         WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
2308         master->is_auto = true;
2309         master->has_volatiles = set_volatile;
2310         master->manual_mode_value = manual_val;
2311         master->flags |= V4L2_CTRL_FLAG_UPDATE;
2312
2313         if (!is_cur_manual(master))
2314                 flag = V4L2_CTRL_FLAG_INACTIVE |
2315                         (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
2316
2317         for (i = 1; i < ncontrols; i++)
2318                 if (controls[i])
2319                         controls[i]->flags |= flag;
2320 }
2321 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
2322
2323 /* Activate/deactivate a control. */
2324 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
2325 {
2326         /* invert since the actual flag is called 'inactive' */
2327         bool inactive = !active;
2328         bool old;
2329
2330         if (ctrl == NULL)
2331                 return;
2332
2333         if (inactive)
2334                 /* set V4L2_CTRL_FLAG_INACTIVE */
2335                 old = test_and_set_bit(4, &ctrl->flags);
2336         else
2337                 /* clear V4L2_CTRL_FLAG_INACTIVE */
2338                 old = test_and_clear_bit(4, &ctrl->flags);
2339         if (old != inactive)
2340                 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2341 }
2342 EXPORT_SYMBOL(v4l2_ctrl_activate);
2343
2344 /* Grab/ungrab a control.
2345    Typically used when streaming starts and you want to grab controls,
2346    preventing the user from changing them.
2347
2348    Just call this and the framework will block any attempts to change
2349    these controls. */
2350 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
2351 {
2352         bool old;
2353
2354         if (ctrl == NULL)
2355                 return;
2356
2357         v4l2_ctrl_lock(ctrl);
2358         if (grabbed)
2359                 /* set V4L2_CTRL_FLAG_GRABBED */
2360                 old = test_and_set_bit(1, &ctrl->flags);
2361         else
2362                 /* clear V4L2_CTRL_FLAG_GRABBED */
2363                 old = test_and_clear_bit(1, &ctrl->flags);
2364         if (old != grabbed)
2365                 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2366         v4l2_ctrl_unlock(ctrl);
2367 }
2368 EXPORT_SYMBOL(v4l2_ctrl_grab);
2369
2370 /* Log the control name and value */
2371 static void log_ctrl(const struct v4l2_ctrl *ctrl,
2372                      const char *prefix, const char *colon)
2373 {
2374         if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
2375                 return;
2376         if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2377                 return;
2378
2379         pr_info("%s%s%s: ", prefix, colon, ctrl->name);
2380
2381         ctrl->type_ops->log(ctrl);
2382
2383         if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
2384                            V4L2_CTRL_FLAG_GRABBED |
2385                            V4L2_CTRL_FLAG_VOLATILE)) {
2386                 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
2387                         pr_cont(" inactive");
2388                 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
2389                         pr_cont(" grabbed");
2390                 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
2391                         pr_cont(" volatile");
2392         }
2393         pr_cont("\n");
2394 }
2395
2396 /* Log all controls owned by the handler */
2397 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
2398                                   const char *prefix)
2399 {
2400         struct v4l2_ctrl *ctrl;
2401         const char *colon = "";
2402         int len;
2403
2404         if (hdl == NULL)
2405                 return;
2406         if (prefix == NULL)
2407                 prefix = "";
2408         len = strlen(prefix);
2409         if (len && prefix[len - 1] != ' ')
2410                 colon = ": ";
2411         mutex_lock(hdl->lock);
2412         list_for_each_entry(ctrl, &hdl->ctrls, node)
2413                 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
2414                         log_ctrl(ctrl, prefix, colon);
2415         mutex_unlock(hdl->lock);
2416 }
2417 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
2418
2419 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
2420 {
2421         v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
2422         return 0;
2423 }
2424 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
2425
2426 /* Call s_ctrl for all controls owned by the handler */
2427 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2428 {
2429         struct v4l2_ctrl *ctrl;
2430         int ret = 0;
2431
2432         if (hdl == NULL)
2433                 return 0;
2434         mutex_lock(hdl->lock);
2435         list_for_each_entry(ctrl, &hdl->ctrls, node)
2436                 ctrl->done = false;
2437
2438         list_for_each_entry(ctrl, &hdl->ctrls, node) {
2439                 struct v4l2_ctrl *master = ctrl->cluster[0];
2440                 int i;
2441
2442                 /* Skip if this control was already handled by a cluster. */
2443                 /* Skip button controls and read-only controls. */
2444                 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
2445                     (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
2446                         continue;
2447
2448                 for (i = 0; i < master->ncontrols; i++) {
2449                         if (master->cluster[i]) {
2450                                 cur_to_new(master->cluster[i]);
2451                                 master->cluster[i]->is_new = 1;
2452                                 master->cluster[i]->done = true;
2453                         }
2454                 }
2455                 ret = call_op(master, s_ctrl);
2456                 if (ret)
2457                         break;
2458         }
2459         mutex_unlock(hdl->lock);
2460         return ret;
2461 }
2462 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
2463
2464 /* Implement VIDIOC_QUERY_EXT_CTRL */
2465 int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc)
2466 {
2467         const unsigned next_flags = V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
2468         u32 id = qc->id & V4L2_CTRL_ID_MASK;
2469         struct v4l2_ctrl_ref *ref;
2470         struct v4l2_ctrl *ctrl;
2471
2472         if (hdl == NULL)
2473                 return -EINVAL;
2474
2475         mutex_lock(hdl->lock);
2476
2477         /* Try to find it */
2478         ref = find_ref(hdl, id);
2479
2480         if ((qc->id & next_flags) && !list_empty(&hdl->ctrl_refs)) {
2481                 bool is_compound;
2482                 /* Match any control that is not hidden */
2483                 unsigned mask = 1;
2484                 bool match = false;
2485
2486                 if ((qc->id & next_flags) == V4L2_CTRL_FLAG_NEXT_COMPOUND) {
2487                         /* Match any hidden control */
2488                         match = true;
2489                 } else if ((qc->id & next_flags) == next_flags) {
2490                         /* Match any control, compound or not */
2491                         mask = 0;
2492                 }
2493
2494                 /* Find the next control with ID > qc->id */
2495
2496                 /* Did we reach the end of the control list? */
2497                 if (id >= node2id(hdl->ctrl_refs.prev)) {
2498                         ref = NULL; /* Yes, so there is no next control */
2499                 } else if (ref) {
2500                         /* We found a control with the given ID, so just get
2501                            the next valid one in the list. */
2502                         list_for_each_entry_continue(ref, &hdl->ctrl_refs, node) {
2503                                 is_compound = ref->ctrl->is_array ||
2504                                         ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2505                                 if (id < ref->ctrl->id &&
2506                                     (is_compound & mask) == match)
2507                                         break;
2508                         }
2509                         if (&ref->node == &hdl->ctrl_refs)
2510                                 ref = NULL;
2511                 } else {
2512                         /* No control with the given ID exists, so start
2513                            searching for the next largest ID. We know there
2514                            is one, otherwise the first 'if' above would have
2515                            been true. */
2516                         list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2517                                 is_compound = ref->ctrl->is_array ||
2518                                         ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2519                                 if (id < ref->ctrl->id &&
2520                                     (is_compound & mask) == match)
2521                                         break;
2522                         }
2523                         if (&ref->node == &hdl->ctrl_refs)
2524                                 ref = NULL;
2525                 }
2526         }
2527         mutex_unlock(hdl->lock);
2528
2529         if (!ref)
2530                 return -EINVAL;
2531
2532         ctrl = ref->ctrl;
2533         memset(qc, 0, sizeof(*qc));
2534         if (id >= V4L2_CID_PRIVATE_BASE)
2535                 qc->id = id;
2536         else
2537                 qc->id = ctrl->id;
2538         strlcpy(qc->name, ctrl->name, sizeof(qc->name));
2539         qc->flags = ctrl->flags;
2540         qc->type = ctrl->type;
2541         if (ctrl->is_ptr)
2542                 qc->flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
2543         qc->elem_size = ctrl->elem_size;
2544         qc->elems = ctrl->elems;
2545         qc->nr_of_dims = ctrl->nr_of_dims;
2546         memcpy(qc->dims, ctrl->dims, qc->nr_of_dims * sizeof(qc->dims[0]));
2547         qc->minimum = ctrl->minimum;
2548         qc->maximum = ctrl->maximum;
2549         qc->default_value = ctrl->default_value;
2550         if (ctrl->type == V4L2_CTRL_TYPE_MENU
2551             || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
2552                 qc->step = 1;
2553         else
2554                 qc->step = ctrl->step;
2555         return 0;
2556 }
2557 EXPORT_SYMBOL(v4l2_query_ext_ctrl);
2558
2559 /* Implement VIDIOC_QUERYCTRL */
2560 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
2561 {
2562         struct v4l2_query_ext_ctrl qec = { qc->id };
2563         int rc;
2564
2565         rc = v4l2_query_ext_ctrl(hdl, &qec);
2566         if (rc)
2567                 return rc;
2568
2569         qc->id = qec.id;
2570         qc->type = qec.type;
2571         qc->flags = qec.flags;
2572         strlcpy(qc->name, qec.name, sizeof(qc->name));
2573         switch (qc->type) {
2574         case V4L2_CTRL_TYPE_INTEGER:
2575         case V4L2_CTRL_TYPE_BOOLEAN:
2576         case V4L2_CTRL_TYPE_MENU:
2577         case V4L2_CTRL_TYPE_INTEGER_MENU:
2578         case V4L2_CTRL_TYPE_STRING:
2579         case V4L2_CTRL_TYPE_BITMASK:
2580                 qc->minimum = qec.minimum;
2581                 qc->maximum = qec.maximum;
2582                 qc->step = qec.step;
2583                 qc->default_value = qec.default_value;
2584                 break;
2585         default:
2586                 qc->minimum = 0;
2587                 qc->maximum = 0;
2588                 qc->step = 0;
2589                 qc->default_value = 0;
2590                 break;
2591         }
2592         return 0;
2593 }
2594 EXPORT_SYMBOL(v4l2_queryctrl);
2595
2596 int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
2597 {
2598         if (qc->id & (V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND))
2599                 return -EINVAL;
2600         return v4l2_queryctrl(sd->ctrl_handler, qc);
2601 }
2602 EXPORT_SYMBOL(v4l2_subdev_queryctrl);
2603
2604 /* Implement VIDIOC_QUERYMENU */
2605 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2606 {
2607         struct v4l2_ctrl *ctrl;
2608         u32 i = qm->index;
2609
2610         ctrl = v4l2_ctrl_find(hdl, qm->id);
2611         if (!ctrl)
2612                 return -EINVAL;
2613
2614         qm->reserved = 0;
2615         /* Sanity checks */
2616         switch (ctrl->type) {
2617         case V4L2_CTRL_TYPE_MENU:
2618                 if (ctrl->qmenu == NULL)
2619                         return -EINVAL;
2620                 break;
2621         case V4L2_CTRL_TYPE_INTEGER_MENU:
2622                 if (ctrl->qmenu_int == NULL)
2623                         return -EINVAL;
2624                 break;
2625         default:
2626                 return -EINVAL;
2627         }
2628
2629         if (i < ctrl->minimum || i > ctrl->maximum)
2630                 return -EINVAL;
2631
2632         /* Use mask to see if this menu item should be skipped */
2633         if (ctrl->menu_skip_mask & (1 << i))
2634                 return -EINVAL;
2635         /* Empty menu items should also be skipped */
2636         if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2637                 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2638                         return -EINVAL;
2639                 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2640         } else {
2641                 qm->value = ctrl->qmenu_int[i];
2642         }
2643         return 0;
2644 }
2645 EXPORT_SYMBOL(v4l2_querymenu);
2646
2647 int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
2648 {
2649         return v4l2_querymenu(sd->ctrl_handler, qm);
2650 }
2651 EXPORT_SYMBOL(v4l2_subdev_querymenu);
2652
2653
2654
2655 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
2656
2657    It is not a fully atomic operation, just best-effort only. After all, if
2658    multiple controls have to be set through multiple i2c writes (for example)
2659    then some initial writes may succeed while others fail. Thus leaving the
2660    system in an inconsistent state. The question is how much effort you are
2661    willing to spend on trying to make something atomic that really isn't.
2662
2663    From the point of view of an application the main requirement is that
2664    when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
2665    error should be returned without actually affecting any controls.
2666
2667    If all the values are correct, then it is acceptable to just give up
2668    in case of low-level errors.
2669
2670    It is important though that the application can tell when only a partial
2671    configuration was done. The way we do that is through the error_idx field
2672    of struct v4l2_ext_controls: if that is equal to the count field then no
2673    controls were affected. Otherwise all controls before that index were
2674    successful in performing their 'get' or 'set' operation, the control at
2675    the given index failed, and you don't know what happened with the controls
2676    after the failed one. Since if they were part of a control cluster they
2677    could have been successfully processed (if a cluster member was encountered
2678    at index < error_idx), they could have failed (if a cluster member was at
2679    error_idx), or they may not have been processed yet (if the first cluster
2680    member appeared after error_idx).
2681
2682    It is all fairly theoretical, though. In practice all you can do is to
2683    bail out. If error_idx == count, then it is an application bug. If
2684    error_idx < count then it is only an application bug if the error code was
2685    EBUSY. That usually means that something started streaming just when you
2686    tried to set the controls. In all other cases it is a driver/hardware
2687    problem and all you can do is to retry or bail out.
2688
2689    Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
2690    never modifies controls the error_idx is just set to whatever control
2691    has an invalid value.
2692  */
2693
2694 /* Prepare for the extended g/s/try functions.
2695    Find the controls in the control array and do some basic checks. */
2696 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
2697                              struct v4l2_ext_controls *cs,
2698                              struct v4l2_ctrl_helper *helpers,
2699                              bool get)
2700 {
2701         struct v4l2_ctrl_helper *h;
2702         bool have_clusters = false;
2703         u32 i;
2704
2705         for (i = 0, h = helpers; i < cs->count; i++, h++) {
2706                 struct v4l2_ext_control *c = &cs->controls[i];
2707                 struct v4l2_ctrl_ref *ref;
2708                 struct v4l2_ctrl *ctrl;
2709                 u32 id = c->id & V4L2_CTRL_ID_MASK;
2710
2711                 cs->error_idx = i;
2712
2713                 if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
2714                         return -EINVAL;
2715
2716                 /* Old-style private controls are not allowed for
2717                    extended controls */
2718                 if (id >= V4L2_CID_PRIVATE_BASE)
2719                         return -EINVAL;
2720                 ref = find_ref_lock(hdl, id);
2721                 if (ref == NULL)
2722                         return -EINVAL;
2723                 ctrl = ref->ctrl;
2724                 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
2725                         return -EINVAL;
2726
2727                 if (ctrl->cluster[0]->ncontrols > 1)
2728                         have_clusters = true;
2729                 if (ctrl->cluster[0] != ctrl)
2730                         ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
2731                 if (ctrl->is_ptr && !ctrl->is_string) {
2732                         unsigned tot_size = ctrl->elems * ctrl->elem_size;
2733
2734                         if (c->size < tot_size) {
2735                                 if (get) {
2736                                         c->size = tot_size;
2737                                         return -ENOSPC;
2738                                 }
2739                                 return -EFAULT;
2740                         }
2741                         c->size = tot_size;
2742                 }
2743                 /* Store the ref to the master control of the cluster */
2744                 h->mref = ref;
2745                 h->ctrl = ctrl;
2746                 /* Initially set next to 0, meaning that there is no other
2747                    control in this helper array belonging to the same
2748                    cluster */
2749                 h->next = 0;
2750         }
2751
2752         /* We are done if there were no controls that belong to a multi-
2753            control cluster. */
2754         if (!have_clusters)
2755                 return 0;
2756
2757         /* The code below figures out in O(n) time which controls in the list
2758            belong to the same cluster. */
2759
2760         /* This has to be done with the handler lock taken. */
2761         mutex_lock(hdl->lock);
2762
2763         /* First zero the helper field in the master control references */
2764         for (i = 0; i < cs->count; i++)
2765                 helpers[i].mref->helper = NULL;
2766         for (i = 0, h = helpers; i < cs->count; i++, h++) {
2767                 struct v4l2_ctrl_ref *mref = h->mref;
2768
2769                 /* If the mref->helper is set, then it points to an earlier
2770                    helper that belongs to the same cluster. */
2771                 if (mref->helper) {
2772                         /* Set the next field of mref->helper to the current
2773                            index: this means that that earlier helper now
2774                            points to the next helper in the same cluster. */
2775                         mref->helper->next = i;
2776                         /* mref should be set only for the first helper in the
2777                            cluster, clear the others. */
2778                         h->mref = NULL;
2779                 }
2780                 /* Point the mref helper to the current helper struct. */
2781                 mref->helper = h;
2782         }
2783         mutex_unlock(hdl->lock);
2784         return 0;
2785 }
2786
2787 /* Handles the corner case where cs->count == 0. It checks whether the
2788    specified control class exists. If that class ID is 0, then it checks
2789    whether there are any controls at all. */
2790 static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class)
2791 {
2792         if (ctrl_class == 0)
2793                 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
2794         return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL;
2795 }
2796
2797
2798
2799 /* Get extended controls. Allocates the helpers array if needed. */
2800 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2801 {
2802         struct v4l2_ctrl_helper helper[4];
2803         struct v4l2_ctrl_helper *helpers = helper;
2804         int ret;
2805         int i, j;
2806
2807         cs->error_idx = cs->count;
2808         cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2809
2810         if (hdl == NULL)
2811                 return -EINVAL;
2812
2813         if (cs->count == 0)
2814                 return class_check(hdl, cs->ctrl_class);
2815
2816         if (cs->count > ARRAY_SIZE(helper)) {
2817                 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2818                                         GFP_KERNEL);
2819                 if (helpers == NULL)
2820                         return -ENOMEM;
2821         }
2822
2823         ret = prepare_ext_ctrls(hdl, cs, helpers, true);
2824         cs->error_idx = cs->count;
2825
2826         for (i = 0; !ret && i < cs->count; i++)
2827                 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2828                         ret = -EACCES;
2829
2830         for (i = 0; !ret && i < cs->count; i++) {
2831                 int (*ctrl_to_user)(struct v4l2_ext_control *c,
2832                                     struct v4l2_ctrl *ctrl) = cur_to_user;
2833                 struct v4l2_ctrl *master;
2834
2835                 if (helpers[i].mref == NULL)
2836                         continue;
2837
2838                 master = helpers[i].mref->ctrl;
2839                 cs->error_idx = i;
2840
2841                 v4l2_ctrl_lock(master);
2842
2843                 /* g_volatile_ctrl will update the new control values */
2844                 if ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
2845                         (master->has_volatiles && !is_cur_manual(master))) {
2846                         for (j = 0; j < master->ncontrols; j++)
2847                                 cur_to_new(master->cluster[j]);
2848                         ret = call_op(master, g_volatile_ctrl);
2849                         ctrl_to_user = new_to_user;
2850                 }
2851                 /* If OK, then copy the current (for non-volatile controls)
2852                    or the new (for volatile controls) control values to the
2853                    caller */
2854                 if (!ret) {
2855                         u32 idx = i;
2856
2857                         do {
2858                                 ret = ctrl_to_user(cs->controls + idx,
2859                                                    helpers[idx].ctrl);
2860                                 idx = helpers[idx].next;
2861                         } while (!ret && idx);
2862                 }
2863                 v4l2_ctrl_unlock(master);
2864         }
2865
2866         if (cs->count > ARRAY_SIZE(helper))
2867                 kfree(helpers);
2868         return ret;
2869 }
2870 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2871
2872 int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2873 {
2874         return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
2875 }
2876 EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
2877
2878 /* Helper function to get a single control */
2879 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
2880 {
2881         struct v4l2_ctrl *master = ctrl->cluster[0];
2882         int ret = 0;
2883         int i;
2884
2885         /* Compound controls are not supported. The new_to_user() and
2886          * cur_to_user() calls below would need to be modified not to access
2887          * userspace memory when called from get_ctrl().
2888          */
2889         if (!ctrl->is_int && ctrl->type != V4L2_CTRL_TYPE_INTEGER64)
2890                 return -EINVAL;
2891
2892         if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2893                 return -EACCES;
2894
2895         v4l2_ctrl_lock(master);
2896         /* g_volatile_ctrl will update the current control values */
2897         if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2898                 for (i = 0; i < master->ncontrols; i++)
2899                         cur_to_new(master->cluster[i]);
2900                 ret = call_op(master, g_volatile_ctrl);
2901                 new_to_user(c, ctrl);
2902         } else {
2903                 cur_to_user(c, ctrl);
2904         }
2905         v4l2_ctrl_unlock(master);
2906         return ret;
2907 }
2908
2909 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2910 {
2911         struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2912         struct v4l2_ext_control c;
2913         int ret;
2914
2915         if (ctrl == NULL || !ctrl->is_int)
2916                 return -EINVAL;
2917         ret = get_ctrl(ctrl, &c);
2918         control->value = c.value;
2919         return ret;
2920 }
2921 EXPORT_SYMBOL(v4l2_g_ctrl);
2922
2923 int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2924 {
2925         return v4l2_g_ctrl(sd->ctrl_handler, control);
2926 }
2927 EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
2928
2929 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2930 {
2931         struct v4l2_ext_control c;
2932
2933         /* It's a driver bug if this happens. */
2934         WARN_ON(!ctrl->is_int);
2935         c.value = 0;
2936         get_ctrl(ctrl, &c);
2937         return c.value;
2938 }
2939 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2940
2941 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
2942 {
2943         struct v4l2_ext_control c;
2944
2945         /* It's a driver bug if this happens. */
2946         WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2947         c.value64 = 0;
2948         get_ctrl(ctrl, &c);
2949         return c.value64;
2950 }
2951 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
2952
2953
2954 /* Core function that calls try/s_ctrl and ensures that the new value is
2955    copied to the current value on a set.
2956    Must be called with ctrl->handler->lock held. */
2957 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
2958                               bool set, u32 ch_flags)
2959 {
2960         bool update_flag;
2961         int ret;
2962         int i;
2963
2964         /* Go through the cluster and either validate the new value or
2965            (if no new value was set), copy the current value to the new
2966            value, ensuring a consistent view for the control ops when
2967            called. */
2968         for (i = 0; i < master->ncontrols; i++) {
2969                 struct v4l2_ctrl *ctrl = master->cluster[i];
2970
2971                 if (ctrl == NULL)
2972                         continue;
2973
2974                 if (!ctrl->is_new) {
2975                         cur_to_new(ctrl);
2976                         continue;
2977                 }
2978                 /* Check again: it may have changed since the
2979                    previous check in try_or_set_ext_ctrls(). */
2980                 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2981                         return -EBUSY;
2982         }
2983
2984         ret = call_op(master, try_ctrl);
2985
2986         /* Don't set if there is no change */
2987         if (ret || !set || !cluster_changed(master))
2988                 return ret;
2989         ret = call_op(master, s_ctrl);
2990         if (ret)
2991                 return ret;
2992
2993         /* If OK, then make the new values permanent. */
2994         update_flag = is_cur_manual(master) != is_new_manual(master);
2995         for (i = 0; i < master->ncontrols; i++)
2996                 new_to_cur(fh, master->cluster[i], ch_flags |
2997                         ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
2998         return 0;
2999 }
3000
3001 /* Validate controls. */
3002 static int validate_ctrls(struct v4l2_ext_controls *cs,
3003                           struct v4l2_ctrl_helper *helpers, bool set)
3004 {
3005         unsigned i;
3006         int ret = 0;
3007
3008         cs->error_idx = cs->count;
3009         for (i = 0; i < cs->count; i++) {
3010                 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
3011                 union v4l2_ctrl_ptr p_new;
3012
3013                 cs->error_idx = i;
3014
3015                 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3016                         return -EACCES;
3017                 /* This test is also done in try_set_control_cluster() which
3018                    is called in atomic context, so that has the final say,
3019                    but it makes sense to do an up-front check as well. Once
3020                    an error occurs in try_set_control_cluster() some other
3021                    controls may have been set already and we want to do a
3022                    best-effort to avoid that. */
3023                 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3024                         return -EBUSY;
3025                 /*
3026                  * Skip validation for now if the payload needs to be copied
3027                  * from userspace into kernelspace. We'll validate those later.
3028                  */
3029                 if (ctrl->is_ptr)
3030                         continue;
3031                 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3032                         p_new.p_s64 = &cs->controls[i].value64;
3033                 else
3034                         p_new.p_s32 = &cs->controls[i].value;
3035                 ret = validate_new(ctrl, p_new);
3036                 if (ret)
3037                         return ret;
3038         }
3039         return 0;
3040 }
3041
3042 /* Obtain the current volatile values of an autocluster and mark them
3043    as new. */
3044 static void update_from_auto_cluster(struct v4l2_ctrl *master)
3045 {
3046         int i;
3047
3048         for (i = 1; i < master->ncontrols; i++)
3049                 cur_to_new(master->cluster[i]);
3050         if (!call_op(master, g_volatile_ctrl))
3051                 for (i = 1; i < master->ncontrols; i++)
3052                         if (master->cluster[i])
3053                                 master->cluster[i]->is_new = 1;
3054 }
3055
3056 /* Try or try-and-set controls */
3057 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3058                              struct v4l2_ext_controls *cs,
3059                              bool set)
3060 {
3061         struct v4l2_ctrl_helper helper[4];
3062         struct v4l2_ctrl_helper *helpers = helper;
3063         unsigned i, j;
3064         int ret;
3065
3066         cs->error_idx = cs->count;
3067         cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
3068
3069         if (hdl == NULL)
3070                 return -EINVAL;
3071
3072         if (cs->count == 0)
3073                 return class_check(hdl, cs->ctrl_class);
3074
3075         if (cs->count > ARRAY_SIZE(helper)) {
3076                 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
3077                                         GFP_KERNEL);
3078                 if (!helpers)
3079                         return -ENOMEM;
3080         }
3081         ret = prepare_ext_ctrls(hdl, cs, helpers, false);
3082         if (!ret)
3083                 ret = validate_ctrls(cs, helpers, set);
3084         if (ret && set)
3085                 cs->error_idx = cs->count;
3086         for (i = 0; !ret && i < cs->count; i++) {
3087                 struct v4l2_ctrl *master;
3088                 u32 idx = i;
3089
3090                 if (helpers[i].mref == NULL)
3091                         continue;
3092
3093                 cs->error_idx = i;
3094                 master = helpers[i].mref->ctrl;
3095                 v4l2_ctrl_lock(master);
3096
3097                 /* Reset the 'is_new' flags of the cluster */
3098                 for (j = 0; j < master->ncontrols; j++)
3099                         if (master->cluster[j])
3100                                 master->cluster[j]->is_new = 0;
3101
3102                 /* For volatile autoclusters that are currently in auto mode
3103                    we need to discover if it will be set to manual mode.
3104                    If so, then we have to copy the current volatile values
3105                    first since those will become the new manual values (which
3106                    may be overwritten by explicit new values from this set
3107                    of controls). */
3108                 if (master->is_auto && master->has_volatiles &&
3109                                                 !is_cur_manual(master)) {
3110                         /* Pick an initial non-manual value */
3111                         s32 new_auto_val = master->manual_mode_value + 1;
3112                         u32 tmp_idx = idx;
3113
3114                         do {
3115                                 /* Check if the auto control is part of the
3116                                    list, and remember the new value. */
3117                                 if (helpers[tmp_idx].ctrl == master)
3118                                         new_auto_val = cs->controls[tmp_idx].value;
3119                                 tmp_idx = helpers[tmp_idx].next;
3120                         } while (tmp_idx);
3121                         /* If the new value == the manual value, then copy
3122                            the current volatile values. */
3123                         if (new_auto_val == master->manual_mode_value)
3124                                 update_from_auto_cluster(master);
3125                 }
3126
3127                 /* Copy the new caller-supplied control values.
3128                    user_to_new() sets 'is_new' to 1. */
3129                 do {
3130                         struct v4l2_ctrl *ctrl = helpers[idx].ctrl;
3131
3132                         ret = user_to_new(cs->controls + idx, ctrl);
3133                         if (!ret && ctrl->is_ptr)
3134                                 ret = validate_new(ctrl, ctrl->p_new);
3135                         idx = helpers[idx].next;
3136                 } while (!ret && idx);
3137
3138                 if (!ret)
3139                         ret = try_or_set_cluster(fh, master, set, 0);
3140
3141                 /* Copy the new values back to userspace. */
3142                 if (!ret) {
3143                         idx = i;
3144                         do {
3145                                 ret = new_to_user(cs->controls + idx,
3146                                                 helpers[idx].ctrl);
3147                                 idx = helpers[idx].next;
3148                         } while (!ret && idx);
3149                 }
3150                 v4l2_ctrl_unlock(master);
3151         }
3152
3153         if (cs->count > ARRAY_SIZE(helper))
3154                 kfree(helpers);
3155         return ret;
3156 }
3157
3158 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
3159 {
3160         return try_set_ext_ctrls(NULL, hdl, cs, false);
3161 }
3162 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
3163
3164 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3165                                         struct v4l2_ext_controls *cs)
3166 {
3167         return try_set_ext_ctrls(fh, hdl, cs, true);
3168 }
3169 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
3170
3171 int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
3172 {
3173         return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, false);
3174 }
3175 EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
3176
3177 int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
3178 {
3179         return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, true);
3180 }
3181 EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
3182
3183 /* Helper function for VIDIOC_S_CTRL compatibility */
3184 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
3185 {
3186         struct v4l2_ctrl *master = ctrl->cluster[0];
3187         int ret;
3188         int i;
3189
3190         /* Reset the 'is_new' flags of the cluster */
3191         for (i = 0; i < master->ncontrols; i++)
3192                 if (master->cluster[i])
3193                         master->cluster[i]->is_new = 0;
3194
3195         ret = validate_new(ctrl, ctrl->p_new);
3196         if (ret)
3197                 return ret;
3198
3199         /* For autoclusters with volatiles that are switched from auto to
3200            manual mode we have to update the current volatile values since
3201            those will become the initial manual values after such a switch. */
3202         if (master->is_auto && master->has_volatiles && ctrl == master &&
3203             !is_cur_manual(master) && ctrl->val == master->manual_mode_value)
3204                 update_from_auto_cluster(master);
3205
3206         ctrl->is_new = 1;
3207         return try_or_set_cluster(fh, master, true, ch_flags);
3208 }
3209
3210 /* Helper function for VIDIOC_S_CTRL compatibility */
3211 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
3212                          struct v4l2_ext_control *c)
3213 {
3214         int ret;
3215
3216         v4l2_ctrl_lock(ctrl);
3217         user_to_new(c, ctrl);
3218         ret = set_ctrl(fh, ctrl, 0);
3219         if (!ret)
3220                 cur_to_user(c, ctrl);
3221         v4l2_ctrl_unlock(ctrl);
3222         return ret;
3223 }
3224
3225 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3226                                         struct v4l2_control *control)
3227 {
3228         struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3229         struct v4l2_ext_control c = { control->id };
3230         int ret;
3231
3232         if (ctrl == NULL || !ctrl->is_int)
3233                 return -EINVAL;
3234
3235         if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3236                 return -EACCES;
3237
3238         c.value = control->value;
3239         ret = set_ctrl_lock(fh, ctrl, &c);
3240         control->value = c.value;
3241         return ret;
3242 }
3243 EXPORT_SYMBOL(v4l2_s_ctrl);
3244
3245 int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
3246 {
3247         return v4l2_s_ctrl(NULL, sd->ctrl_handler, control);
3248 }
3249 EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
3250
3251 int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
3252 {
3253         lockdep_assert_held(ctrl->handler->lock);
3254
3255         /* It's a driver bug if this happens. */
3256         WARN_ON(!ctrl->is_int);
3257         ctrl->val = val;
3258         return set_ctrl(NULL, ctrl, 0);
3259 }
3260 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl);
3261
3262 int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
3263 {
3264         lockdep_assert_held(ctrl->handler->lock);
3265
3266         /* It's a driver bug if this happens. */
3267         WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3268         *ctrl->p_new.p_s64 = val;
3269         return set_ctrl(NULL, ctrl, 0);
3270 }
3271 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_int64);
3272
3273 int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
3274 {
3275         lockdep_assert_held(ctrl->handler->lock);
3276
3277         /* It's a driver bug if this happens. */
3278         WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING);
3279         strlcpy(ctrl->p_new.p_char, s, ctrl->maximum + 1);
3280         return set_ctrl(NULL, ctrl, 0);
3281 }
3282 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_string);
3283
3284 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
3285 {
3286         if (ctrl == NULL)
3287                 return;
3288         if (notify == NULL) {
3289                 ctrl->call_notify = 0;
3290                 return;
3291         }
3292         if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
3293                 return;
3294         ctrl->handler->notify = notify;
3295         ctrl->handler->notify_priv = priv;
3296         ctrl->call_notify = 1;
3297 }
3298 EXPORT_SYMBOL(v4l2_ctrl_notify);
3299
3300 int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
3301                         s64 min, s64 max, u64 step, s64 def)
3302 {
3303         bool changed;
3304         int ret;
3305
3306         lockdep_assert_held(ctrl->handler->lock);
3307
3308         switch (ctrl->type) {
3309         case V4L2_CTRL_TYPE_INTEGER:
3310         case V4L2_CTRL_TYPE_INTEGER64:
3311         case V4L2_CTRL_TYPE_BOOLEAN:
3312         case V4L2_CTRL_TYPE_MENU:
3313         case V4L2_CTRL_TYPE_INTEGER_MENU:
3314         case V4L2_CTRL_TYPE_BITMASK:
3315         case V4L2_CTRL_TYPE_U8:
3316         case V4L2_CTRL_TYPE_U16:
3317         case V4L2_CTRL_TYPE_U32:
3318                 if (ctrl->is_array)
3319                         return -EINVAL;
3320                 ret = check_range(ctrl->type, min, max, step, def);
3321                 if (ret)
3322                         return ret;
3323                 break;
3324         default:
3325                 return -EINVAL;
3326         }
3327         ctrl->minimum = min;
3328         ctrl->maximum = max;
3329         ctrl->step = step;
3330         ctrl->default_value = def;
3331         cur_to_new(ctrl);
3332         if (validate_new(ctrl, ctrl->p_new)) {
3333                 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3334                         *ctrl->p_new.p_s64 = def;
3335                 else
3336                         *ctrl->p_new.p_s32 = def;
3337         }
3338
3339         if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3340                 changed = *ctrl->p_new.p_s64 != *ctrl->p_cur.p_s64;
3341         else
3342                 changed = *ctrl->p_new.p_s32 != *ctrl->p_cur.p_s32;
3343         if (changed)
3344                 ret = set_ctrl(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3345         else
3346                 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3347         return ret;
3348 }
3349 EXPORT_SYMBOL(__v4l2_ctrl_modify_range);
3350
3351 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
3352 {
3353         struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3354
3355         if (ctrl == NULL)
3356                 return -EINVAL;
3357
3358         v4l2_ctrl_lock(ctrl);
3359         list_add_tail(&sev->node, &ctrl->ev_subs);
3360         if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
3361             (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
3362                 struct v4l2_event ev;
3363                 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
3364
3365                 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
3366                         changes |= V4L2_EVENT_CTRL_CH_VALUE;
3367                 fill_event(&ev, ctrl, changes);
3368                 /* Mark the queue as active, allowing this initial
3369                    event to be accepted. */
3370                 sev->elems = elems;
3371                 v4l2_event_queue_fh(sev->fh, &ev);
3372         }
3373         v4l2_ctrl_unlock(ctrl);
3374         return 0;
3375 }
3376
3377 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
3378 {
3379         struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3380
3381         v4l2_ctrl_lock(ctrl);
3382         list_del(&sev->node);
3383         v4l2_ctrl_unlock(ctrl);
3384 }
3385
3386 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
3387 {
3388         u32 old_changes = old->u.ctrl.changes;
3389
3390         old->u.ctrl = new->u.ctrl;
3391         old->u.ctrl.changes |= old_changes;
3392 }
3393 EXPORT_SYMBOL(v4l2_ctrl_replace);
3394
3395 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
3396 {
3397         new->u.ctrl.changes |= old->u.ctrl.changes;
3398 }
3399 EXPORT_SYMBOL(v4l2_ctrl_merge);
3400
3401 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
3402         .add = v4l2_ctrl_add_event,
3403         .del = v4l2_ctrl_del_event,
3404         .replace = v4l2_ctrl_replace,
3405         .merge = v4l2_ctrl_merge,
3406 };
3407 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
3408
3409 int v4l2_ctrl_log_status(struct file *file, void *fh)
3410 {
3411         struct video_device *vfd = video_devdata(file);
3412         struct v4l2_fh *vfh = file->private_data;
3413
3414         if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
3415                 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
3416                         vfd->v4l2_dev->name);
3417         return 0;
3418 }
3419 EXPORT_SYMBOL(v4l2_ctrl_log_status);
3420
3421 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
3422                                 const struct v4l2_event_subscription *sub)
3423 {
3424         if (sub->type == V4L2_EVENT_CTRL)
3425                 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
3426         return -EINVAL;
3427 }
3428 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
3429
3430 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
3431                                      struct v4l2_event_subscription *sub)
3432 {
3433         if (!sd->ctrl_handler)
3434                 return -EINVAL;
3435         return v4l2_ctrl_subscribe_event(fh, sub);
3436 }
3437 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
3438
3439 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
3440 {
3441         struct v4l2_fh *fh = file->private_data;
3442
3443         if (v4l2_event_pending(fh))
3444                 return POLLPRI;
3445         poll_wait(file, &fh->wait, wait);
3446         return 0;
3447 }
3448 EXPORT_SYMBOL(v4l2_ctrl_poll);