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   1 /*
   2  *      uvc_ctrl.c  --  USB Video Class driver - Controls
   3  *
   4  *      Copyright (C) 2005-2008
   5  *          Laurent Pinchart (laurent.pinchart@skynet.be)
   6  *
   7  *      This program is free software; you can redistribute it and/or modify
   8  *      it under the terms of the GNU General Public License as published by
   9  *      the Free Software Foundation; either version 2 of the License, or
  10  *      (at your option) any later version.
  11  *
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/version.h>
  16 #include <linux/list.h>
  17 #include <linux/module.h>
  18 #include <linux/uaccess.h>
  19 #include <linux/usb.h>
  20 #include <linux/videodev2.h>
  21 #include <linux/vmalloc.h>
  22 #include <linux/wait.h>
  23 #include <asm/atomic.h>
  24
  25 #include "uvcvideo.h"
  26
  27 #define UVC_CTRL_NDATA          2
  28 #define UVC_CTRL_DATA_CURRENT   0
  29 #define UVC_CTRL_DATA_BACKUP    1
  30
  31 /* ------------------------------------------------------------------------
  32  * Control, formats, ...
  33  */
  34
  35 static struct uvc_control_info uvc_ctrls[] = {
  36         {
  37                 .entity         = UVC_GUID_UVC_PROCESSING,
  38                 .selector       = PU_BRIGHTNESS_CONTROL,
  39                 .index          = 0,
  40                 .size           = 2,
  41                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
  42                                 | UVC_CONTROL_RESTORE,
  43         },
  44         {
  45                 .entity         = UVC_GUID_UVC_PROCESSING,
  46                 .selector       = PU_CONTRAST_CONTROL,
  47                 .index          = 1,
  48                 .size           = 2,
  49                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
  50                                 | UVC_CONTROL_RESTORE,
  51         },
  52         {
  53                 .entity         = UVC_GUID_UVC_PROCESSING,
  54                 .selector       = PU_HUE_CONTROL,
  55                 .index          = 2,
  56                 .size           = 2,
  57                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
  58                                 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
  59         },
  60         {
  61                 .entity         = UVC_GUID_UVC_PROCESSING,
  62                 .selector       = PU_SATURATION_CONTROL,
  63                 .index          = 3,
  64                 .size           = 2,
  65                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
  66                                 | UVC_CONTROL_RESTORE,
  67         },
  68         {
  69                 .entity         = UVC_GUID_UVC_PROCESSING,
  70                 .selector       = PU_SHARPNESS_CONTROL,
  71                 .index          = 4,
  72                 .size           = 2,
  73                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
  74                                 | UVC_CONTROL_RESTORE,
  75         },
  76         {
  77                 .entity         = UVC_GUID_UVC_PROCESSING,
  78                 .selector       = PU_GAMMA_CONTROL,
  79                 .index          = 5,
  80                 .size           = 2,
  81                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
  82                                 | UVC_CONTROL_RESTORE,
  83         },
  84         {
  85                 .entity         = UVC_GUID_UVC_PROCESSING,
  86                 .selector       = PU_WHITE_BALANCE_TEMPERATURE_CONTROL,
  87                 .index          = 6,
  88                 .size           = 2,
  89                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
  90                                 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
  91         },
  92         {
  93                 .entity         = UVC_GUID_UVC_PROCESSING,
  94                 .selector       = PU_WHITE_BALANCE_COMPONENT_CONTROL,
  95                 .index          = 7,
  96                 .size           = 4,
  97                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
  98                                 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
  99         },
 100         {
 101                 .entity         = UVC_GUID_UVC_PROCESSING,
 102                 .selector       = PU_BACKLIGHT_COMPENSATION_CONTROL,
 103                 .index          = 8,
 104                 .size           = 2,
 105                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 106                                 | UVC_CONTROL_RESTORE,
 107         },
 108         {
 109                 .entity         = UVC_GUID_UVC_PROCESSING,
 110                 .selector       = PU_GAIN_CONTROL,
 111                 .index          = 9,
 112                 .size           = 2,
 113                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 114                                 | UVC_CONTROL_RESTORE,
 115         },
 116         {
 117                 .entity         = UVC_GUID_UVC_PROCESSING,
 118                 .selector       = PU_POWER_LINE_FREQUENCY_CONTROL,
 119                 .index          = 10,
 120                 .size           = 1,
 121                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 122                                 | UVC_CONTROL_RESTORE,
 123         },
 124         {
 125                 .entity         = UVC_GUID_UVC_PROCESSING,
 126                 .selector       = PU_HUE_AUTO_CONTROL,
 127                 .index          = 11,
 128                 .size           = 1,
 129                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 130                                 | UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
 131         },
 132         {
 133                 .entity         = UVC_GUID_UVC_PROCESSING,
 134                 .selector       = PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL,
 135                 .index          = 12,
 136                 .size           = 1,
 137                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 138                                 | UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
 139         },
 140         {
 141                 .entity         = UVC_GUID_UVC_PROCESSING,
 142                 .selector       = PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL,
 143                 .index          = 13,
 144                 .size           = 1,
 145                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 146                                 | UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
 147         },
 148         {
 149                 .entity         = UVC_GUID_UVC_PROCESSING,
 150                 .selector       = PU_DIGITAL_MULTIPLIER_CONTROL,
 151                 .index          = 14,
 152                 .size           = 2,
 153                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 154                                 | UVC_CONTROL_RESTORE,
 155         },
 156         {
 157                 .entity         = UVC_GUID_UVC_PROCESSING,
 158                 .selector       = PU_DIGITAL_MULTIPLIER_LIMIT_CONTROL,
 159                 .index          = 15,
 160                 .size           = 2,
 161                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 162                                 | UVC_CONTROL_RESTORE,
 163         },
 164         {
 165                 .entity         = UVC_GUID_UVC_PROCESSING,
 166                 .selector       = PU_ANALOG_VIDEO_STANDARD_CONTROL,
 167                 .index          = 16,
 168                 .size           = 1,
 169                 .flags          = UVC_CONTROL_GET_CUR,
 170         },
 171         {
 172                 .entity         = UVC_GUID_UVC_PROCESSING,
 173                 .selector       = PU_ANALOG_LOCK_STATUS_CONTROL,
 174                 .index          = 17,
 175                 .size           = 1,
 176                 .flags          = UVC_CONTROL_GET_CUR,
 177         },
 178         {
 179                 .entity         = UVC_GUID_UVC_CAMERA,
 180                 .selector       = CT_SCANNING_MODE_CONTROL,
 181                 .index          = 0,
 182                 .size           = 1,
 183                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 184                                 | UVC_CONTROL_RESTORE,
 185         },
 186         {
 187                 .entity         = UVC_GUID_UVC_CAMERA,
 188                 .selector       = CT_AE_MODE_CONTROL,
 189                 .index          = 1,
 190                 .size           = 1,
 191                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 192                                 | UVC_CONTROL_GET_DEF | UVC_CONTROL_GET_RES
 193                                 | UVC_CONTROL_RESTORE,
 194         },
 195         {
 196                 .entity         = UVC_GUID_UVC_CAMERA,
 197                 .selector       = CT_AE_PRIORITY_CONTROL,
 198                 .index          = 2,
 199                 .size           = 1,
 200                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 201                                 | UVC_CONTROL_RESTORE,
 202         },
 203         {
 204                 .entity         = UVC_GUID_UVC_CAMERA,
 205                 .selector       = CT_EXPOSURE_TIME_ABSOLUTE_CONTROL,
 206                 .index          = 3,
 207                 .size           = 4,
 208                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 209                                 | UVC_CONTROL_RESTORE,
 210         },
 211         {
 212                 .entity         = UVC_GUID_UVC_CAMERA,
 213                 .selector       = CT_EXPOSURE_TIME_RELATIVE_CONTROL,
 214                 .index          = 4,
 215                 .size           = 1,
 216                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 217                                 | UVC_CONTROL_RESTORE,
 218         },
 219         {
 220                 .entity         = UVC_GUID_UVC_CAMERA,
 221                 .selector       = CT_FOCUS_ABSOLUTE_CONTROL,
 222                 .index          = 5,
 223                 .size           = 2,
 224                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 225                                 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
 226         },
 227         {
 228                 .entity         = UVC_GUID_UVC_CAMERA,
 229                 .selector       = CT_FOCUS_RELATIVE_CONTROL,
 230                 .index          = 6,
 231                 .size           = 2,
 232                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 233                                 | UVC_CONTROL_AUTO_UPDATE,
 234         },
 235         {
 236                 .entity         = UVC_GUID_UVC_CAMERA,
 237                 .selector       = CT_IRIS_ABSOLUTE_CONTROL,
 238                 .index          = 7,
 239                 .size           = 2,
 240                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 241                                 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
 242         },
 243         {
 244                 .entity         = UVC_GUID_UVC_CAMERA,
 245                 .selector       = CT_IRIS_RELATIVE_CONTROL,
 246                 .index          = 8,
 247                 .size           = 1,
 248                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 249                                 | UVC_CONTROL_AUTO_UPDATE,
 250         },
 251         {
 252                 .entity         = UVC_GUID_UVC_CAMERA,
 253                 .selector       = CT_ZOOM_ABSOLUTE_CONTROL,
 254                 .index          = 9,
 255                 .size           = 2,
 256                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 257                                 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
 258         },
 259         {
 260                 .entity         = UVC_GUID_UVC_CAMERA,
 261                 .selector       = CT_ZOOM_RELATIVE_CONTROL,
 262                 .index          = 10,
 263                 .size           = 3,
 264                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 265                                 | UVC_CONTROL_AUTO_UPDATE,
 266         },
 267         {
 268                 .entity         = UVC_GUID_UVC_CAMERA,
 269                 .selector       = CT_PANTILT_ABSOLUTE_CONTROL,
 270                 .index          = 11,
 271                 .size           = 8,
 272                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 273                                 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
 274         },
 275         {
 276                 .entity         = UVC_GUID_UVC_CAMERA,
 277                 .selector       = CT_PANTILT_RELATIVE_CONTROL,
 278                 .index          = 12,
 279                 .size           = 4,
 280                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 281                                 | UVC_CONTROL_AUTO_UPDATE,
 282         },
 283         {
 284                 .entity         = UVC_GUID_UVC_CAMERA,
 285                 .selector       = CT_ROLL_ABSOLUTE_CONTROL,
 286                 .index          = 13,
 287                 .size           = 2,
 288                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 289                                 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
 290         },
 291         {
 292                 .entity         = UVC_GUID_UVC_CAMERA,
 293                 .selector       = CT_ROLL_RELATIVE_CONTROL,
 294                 .index          = 14,
 295                 .size           = 2,
 296                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 297                                 | UVC_CONTROL_AUTO_UPDATE,
 298         },
 299         {
 300                 .entity         = UVC_GUID_UVC_CAMERA,
 301                 .selector       = CT_FOCUS_AUTO_CONTROL,
 302                 .index          = 17,
 303                 .size           = 1,
 304                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 305                                 | UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
 306         },
 307         {
 308                 .entity         = UVC_GUID_UVC_CAMERA,
 309                 .selector       = CT_PRIVACY_CONTROL,
 310                 .index          = 18,
 311                 .size           = 1,
 312                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 313                                 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
 314         },
 315 };
 316
 317 static struct uvc_menu_info power_line_frequency_controls[] = {
 318         { 0, "Disabled" },
 319         { 1, "50 Hz" },
 320         { 2, "60 Hz" },
 321 };
 322
 323 static struct uvc_menu_info exposure_auto_controls[] = {
 324         { 2, "Auto Mode" },
 325         { 1, "Manual Mode" },
 326         { 4, "Shutter Priority Mode" },
 327         { 8, "Aperture Priority Mode" },
 328 };
 329
 330 static struct uvc_control_mapping uvc_ctrl_mappings[] = {
 331         {
 332                 .id             = V4L2_CID_BRIGHTNESS,
 333                 .name           = "Brightness",
 334                 .entity         = UVC_GUID_UVC_PROCESSING,
 335                 .selector       = PU_BRIGHTNESS_CONTROL,
 336                 .size           = 16,
 337                 .offset         = 0,
 338                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 339                 .data_type      = UVC_CTRL_DATA_TYPE_SIGNED,
 340         },
 341         {
 342                 .id             = V4L2_CID_CONTRAST,
 343                 .name           = "Contrast",
 344                 .entity         = UVC_GUID_UVC_PROCESSING,
 345                 .selector       = PU_CONTRAST_CONTROL,
 346                 .size           = 16,
 347                 .offset         = 0,
 348                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 349                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 350         },
 351         {
 352                 .id             = V4L2_CID_HUE,
 353                 .name           = "Hue",
 354                 .entity         = UVC_GUID_UVC_PROCESSING,
 355                 .selector       = PU_HUE_CONTROL,
 356                 .size           = 16,
 357                 .offset         = 0,
 358                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 359                 .data_type      = UVC_CTRL_DATA_TYPE_SIGNED,
 360         },
 361         {
 362                 .id             = V4L2_CID_SATURATION,
 363                 .name           = "Saturation",
 364                 .entity         = UVC_GUID_UVC_PROCESSING,
 365                 .selector       = PU_SATURATION_CONTROL,
 366                 .size           = 16,
 367                 .offset         = 0,
 368                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 369                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 370         },
 371         {
 372                 .id             = V4L2_CID_SHARPNESS,
 373                 .name           = "Sharpness",
 374                 .entity         = UVC_GUID_UVC_PROCESSING,
 375                 .selector       = PU_SHARPNESS_CONTROL,
 376                 .size           = 16,
 377                 .offset         = 0,
 378                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 379                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 380         },
 381         {
 382                 .id             = V4L2_CID_GAMMA,
 383                 .name           = "Gamma",
 384                 .entity         = UVC_GUID_UVC_PROCESSING,
 385                 .selector       = PU_GAMMA_CONTROL,
 386                 .size           = 16,
 387                 .offset         = 0,
 388                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 389                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 390         },
 391         {
 392                 .id             = V4L2_CID_BACKLIGHT_COMPENSATION,
 393                 .name           = "Backlight Compensation",
 394                 .entity         = UVC_GUID_UVC_PROCESSING,
 395                 .selector       = PU_BACKLIGHT_COMPENSATION_CONTROL,
 396                 .size           = 16,
 397                 .offset         = 0,
 398                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 399                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 400         },
 401         {
 402                 .id             = V4L2_CID_GAIN,
 403                 .name           = "Gain",
 404                 .entity         = UVC_GUID_UVC_PROCESSING,
 405                 .selector       = PU_GAIN_CONTROL,
 406                 .size           = 16,
 407                 .offset         = 0,
 408                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 409                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 410         },
 411         {
 412                 .id             = V4L2_CID_POWER_LINE_FREQUENCY,
 413                 .name           = "Power Line Frequency",
 414                 .entity         = UVC_GUID_UVC_PROCESSING,
 415                 .selector       = PU_POWER_LINE_FREQUENCY_CONTROL,
 416                 .size           = 2,
 417                 .offset         = 0,
 418                 .v4l2_type      = V4L2_CTRL_TYPE_MENU,
 419                 .data_type      = UVC_CTRL_DATA_TYPE_ENUM,
 420                 .menu_info      = power_line_frequency_controls,
 421                 .menu_count     = ARRAY_SIZE(power_line_frequency_controls),
 422         },
 423         {
 424                 .id             = V4L2_CID_HUE_AUTO,
 425                 .name           = "Hue, Auto",
 426                 .entity         = UVC_GUID_UVC_PROCESSING,
 427                 .selector       = PU_HUE_AUTO_CONTROL,
 428                 .size           = 1,
 429                 .offset         = 0,
 430                 .v4l2_type      = V4L2_CTRL_TYPE_BOOLEAN,
 431                 .data_type      = UVC_CTRL_DATA_TYPE_BOOLEAN,
 432         },
 433         {
 434                 .id             = V4L2_CID_EXPOSURE_AUTO,
 435                 .name           = "Exposure, Auto",
 436                 .entity         = UVC_GUID_UVC_CAMERA,
 437                 .selector       = CT_AE_MODE_CONTROL,
 438                 .size           = 4,
 439                 .offset         = 0,
 440                 .v4l2_type      = V4L2_CTRL_TYPE_MENU,
 441                 .data_type      = UVC_CTRL_DATA_TYPE_BITMASK,
 442                 .menu_info      = exposure_auto_controls,
 443                 .menu_count     = ARRAY_SIZE(exposure_auto_controls),
 444         },
 445         {
 446                 .id             = V4L2_CID_EXPOSURE_AUTO_PRIORITY,
 447                 .name           = "Exposure, Auto Priority",
 448                 .entity         = UVC_GUID_UVC_CAMERA,
 449                 .selector       = CT_AE_PRIORITY_CONTROL,
 450                 .size           = 1,
 451                 .offset         = 0,
 452                 .v4l2_type      = V4L2_CTRL_TYPE_BOOLEAN,
 453                 .data_type      = UVC_CTRL_DATA_TYPE_BOOLEAN,
 454         },
 455         {
 456                 .id             = V4L2_CID_EXPOSURE_ABSOLUTE,
 457                 .name           = "Exposure (Absolute)",
 458                 .entity         = UVC_GUID_UVC_CAMERA,
 459                 .selector       = CT_EXPOSURE_TIME_ABSOLUTE_CONTROL,
 460                 .size           = 32,
 461                 .offset         = 0,
 462                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 463                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 464         },
 465         {
 466                 .id             = V4L2_CID_AUTO_WHITE_BALANCE,
 467                 .name           = "White Balance Temperature, Auto",
 468                 .entity         = UVC_GUID_UVC_PROCESSING,
 469                 .selector       = PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL,
 470                 .size           = 1,
 471                 .offset         = 0,
 472                 .v4l2_type      = V4L2_CTRL_TYPE_BOOLEAN,
 473                 .data_type      = UVC_CTRL_DATA_TYPE_BOOLEAN,
 474         },
 475         {
 476                 .id             = V4L2_CID_WHITE_BALANCE_TEMPERATURE,
 477                 .name           = "White Balance Temperature",
 478                 .entity         = UVC_GUID_UVC_PROCESSING,
 479                 .selector       = PU_WHITE_BALANCE_TEMPERATURE_CONTROL,
 480                 .size           = 16,
 481                 .offset         = 0,
 482                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 483                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 484         },
 485         {
 486                 .id             = V4L2_CID_AUTO_WHITE_BALANCE,
 487                 .name           = "White Balance Component, Auto",
 488                 .entity         = UVC_GUID_UVC_PROCESSING,
 489                 .selector       = PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL,
 490                 .size           = 1,
 491                 .offset         = 0,
 492                 .v4l2_type      = V4L2_CTRL_TYPE_BOOLEAN,
 493                 .data_type      = UVC_CTRL_DATA_TYPE_BOOLEAN,
 494         },
 495         {
 496                 .id             = V4L2_CID_BLUE_BALANCE,
 497                 .name           = "White Balance Blue Component",
 498                 .entity         = UVC_GUID_UVC_PROCESSING,
 499                 .selector       = PU_WHITE_BALANCE_COMPONENT_CONTROL,
 500                 .size           = 16,
 501                 .offset         = 0,
 502                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 503                 .data_type      = UVC_CTRL_DATA_TYPE_SIGNED,
 504         },
 505         {
 506                 .id             = V4L2_CID_RED_BALANCE,
 507                 .name           = "White Balance Red Component",
 508                 .entity         = UVC_GUID_UVC_PROCESSING,
 509                 .selector       = PU_WHITE_BALANCE_COMPONENT_CONTROL,
 510                 .size           = 16,
 511                 .offset         = 16,
 512                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 513                 .data_type      = UVC_CTRL_DATA_TYPE_SIGNED,
 514         },
 515         {
 516                 .id             = V4L2_CID_FOCUS_ABSOLUTE,
 517                 .name           = "Focus (absolute)",
 518                 .entity         = UVC_GUID_UVC_CAMERA,
 519                 .selector       = CT_FOCUS_ABSOLUTE_CONTROL,
 520                 .size           = 16,
 521                 .offset         = 0,
 522                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 523                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 524         },
 525         {
 526                 .id             = V4L2_CID_FOCUS_AUTO,
 527                 .name           = "Focus, Auto",
 528                 .entity         = UVC_GUID_UVC_CAMERA,
 529                 .selector       = CT_FOCUS_AUTO_CONTROL,
 530                 .size           = 1,
 531                 .offset         = 0,
 532                 .v4l2_type      = V4L2_CTRL_TYPE_BOOLEAN,
 533                 .data_type      = UVC_CTRL_DATA_TYPE_BOOLEAN,
 534         },
 535 };
 536
 537 /* ------------------------------------------------------------------------
 538  * Utility functions
 539  */
 540
 541 static inline __u8 *uvc_ctrl_data(struct uvc_control *ctrl, int id)
 542 {
 543         return ctrl->data + id * ctrl->info->size;
 544 }
 545
 546 static inline int uvc_get_bit(const __u8 *data, int bit)
 547 {
 548         return (data[bit >> 3] >> (bit & 7)) & 1;
 549 }
 550
 551 /* Extract the bit string specified by mapping->offset and mapping->size
 552  * from the little-endian data stored at 'data' and return the result as
 553  * a signed 32bit integer. Sign extension will be performed if the mapping
 554  * references a signed data type.
 555  */
 556 static __s32 uvc_get_le_value(const __u8 *data,
 557         struct uvc_control_mapping *mapping)
 558 {
 559         int bits = mapping->size;
 560         int offset = mapping->offset;
 561         __s32 value = 0;
 562         __u8 mask;
 563
 564         data += offset / 8;
 565         offset &= 7;
 566         mask = ((1LL << bits) - 1) << offset;
 567
 568         for (; bits > 0; data++) {
 569                 __u8 byte = *data & mask;
 570                 value |= offset > 0 ? (byte >> offset) : (byte << (-offset));
 571                 bits -= 8 - (offset > 0 ? offset : 0);
 572                 offset -= 8;
 573                 mask = (1 << bits) - 1;
 574         }
 575
 576         /* Sign-extend the value if needed */
 577         if (mapping->data_type == UVC_CTRL_DATA_TYPE_SIGNED)
 578                 value |= -(value & (1 << (mapping->size - 1)));
 579
 580         return value;
 581 }
 582
 583 /* Set the bit string specified by mapping->offset and mapping->size
 584  * in the little-endian data stored at 'data' to the value 'value'.
 585  */
 586 static void uvc_set_le_value(__s32 value, __u8 *data,
 587         struct uvc_control_mapping *mapping)
 588 {
 589         int bits = mapping->size;
 590         int offset = mapping->offset;
 591         __u8 mask;
 592
 593         data += offset / 8;
 594         offset &= 7;
 595
 596         for (; bits > 0; data++) {
 597                 mask = ((1LL << bits) - 1) << offset;
 598                 *data = (*data & ~mask) | ((value << offset) & mask);
 599                 value >>= offset ? offset : 8;
 600                 bits -= 8 - offset;
 601                 offset = 0;
 602         }
 603 }
 604
 605 /* ------------------------------------------------------------------------
 606  * Terminal and unit management
 607  */
 608
 609 static const __u8 uvc_processing_guid[16] = UVC_GUID_UVC_PROCESSING;
 610 static const __u8 uvc_camera_guid[16] = UVC_GUID_UVC_CAMERA;
 611 static const __u8 uvc_media_transport_input_guid[16] =
 612         UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT;
 613
 614 static int uvc_entity_match_guid(struct uvc_entity *entity, __u8 guid[16])
 615 {
 616         switch (UVC_ENTITY_TYPE(entity)) {
 617         case ITT_CAMERA:
 618                 return memcmp(uvc_camera_guid, guid, 16) == 0;
 619
 620         case ITT_MEDIA_TRANSPORT_INPUT:
 621                 return memcmp(uvc_media_transport_input_guid, guid, 16) == 0;
 622
 623         case VC_PROCESSING_UNIT:
 624                 return memcmp(uvc_processing_guid, guid, 16) == 0;
 625
 626         case VC_EXTENSION_UNIT:
 627                 return memcmp(entity->extension.guidExtensionCode,
 628                               guid, 16) == 0;
 629
 630         default:
 631                 return 0;
 632         }
 633 }
 634
 635 /* ------------------------------------------------------------------------
 636  * UVC Controls
 637  */
 638
 639 static void __uvc_find_control(struct uvc_entity *entity, __u32 v4l2_id,
 640         struct uvc_control_mapping **mapping, struct uvc_control **control,
 641         int next)
 642 {
 643         struct uvc_control *ctrl;
 644         struct uvc_control_mapping *map;
 645         unsigned int i;
 646
 647         if (entity == NULL)
 648                 return;
 649
 650         for (i = 0; i < entity->ncontrols; ++i) {
 651                 ctrl = &entity->controls[i];
 652                 if (ctrl->info == NULL)
 653                         continue;
 654
 655                 list_for_each_entry(map, &ctrl->info->mappings, list) {
 656                         if ((map->id == v4l2_id) && !next) {
 657                                 *control = ctrl;
 658                                 *mapping = map;
 659                                 return;
 660                         }
 661
 662                         if ((*mapping == NULL || (*mapping)->id > map->id) &&
 663                             (map->id > v4l2_id) && next) {
 664                                 *control = ctrl;
 665                                 *mapping = map;
 666                         }
 667                 }
 668         }
 669 }
 670
 671 struct uvc_control *uvc_find_control(struct uvc_video_device *video,
 672         __u32 v4l2_id, struct uvc_control_mapping **mapping)
 673 {
 674         struct uvc_control *ctrl = NULL;
 675         struct uvc_entity *entity;
 676         int next = v4l2_id & V4L2_CTRL_FLAG_NEXT_CTRL;
 677
 678         *mapping = NULL;
 679
 680         /* Mask the query flags. */
 681         v4l2_id &= V4L2_CTRL_ID_MASK;
 682
 683         /* Find the control. */
 684         __uvc_find_control(video->processing, v4l2_id, mapping, &ctrl, next);
 685         if (ctrl && !next)
 686                 return ctrl;
 687
 688         list_for_each_entry(entity, &video->iterms, chain) {
 689                 __uvc_find_control(entity, v4l2_id, mapping, &ctrl, next);
 690                 if (ctrl && !next)
 691                         return ctrl;
 692         }
 693
 694         list_for_each_entry(entity, &video->extensions, chain) {
 695                 __uvc_find_control(entity, v4l2_id, mapping, &ctrl, next);
 696                 if (ctrl && !next)
 697                         return ctrl;
 698         }
 699
 700         if (ctrl == NULL && !next)
 701                 uvc_trace(UVC_TRACE_CONTROL, "Control 0x%08x not found.\n",
 702                                 v4l2_id);
 703
 704         return ctrl;
 705 }
 706
 707 int uvc_query_v4l2_ctrl(struct uvc_video_device *video,
 708         struct v4l2_queryctrl *v4l2_ctrl)
 709 {
 710         struct uvc_control *ctrl;
 711         struct uvc_control_mapping *mapping;
 712         struct uvc_menu_info *menu;
 713         unsigned int i;
 714         __u8 *data;
 715         int ret;
 716
 717         ctrl = uvc_find_control(video, v4l2_ctrl->id, &mapping);
 718         if (ctrl == NULL)
 719                 return -EINVAL;
 720
 721         data = kmalloc(ctrl->info->size, GFP_KERNEL);
 722         if (data == NULL)
 723                 return -ENOMEM;
 724
 725         memset(v4l2_ctrl, 0, sizeof *v4l2_ctrl);
 726         v4l2_ctrl->id = mapping->id;
 727         v4l2_ctrl->type = mapping->v4l2_type;
 728         strncpy(v4l2_ctrl->name, mapping->name, sizeof v4l2_ctrl->name);
 729         v4l2_ctrl->flags = 0;
 730
 731         if (!(ctrl->info->flags & UVC_CONTROL_SET_CUR))
 732                 v4l2_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
 733
 734         if (ctrl->info->flags & UVC_CONTROL_GET_DEF) {
 735                 if ((ret = uvc_query_ctrl(video->dev, GET_DEF, ctrl->entity->id,
 736                                 video->dev->intfnum, ctrl->info->selector,
 737                                 data, ctrl->info->size)) < 0)
 738                         goto out;
 739                 v4l2_ctrl->default_value = uvc_get_le_value(data, mapping);
 740         }
 741
 742         switch (mapping->v4l2_type) {
 743         case V4L2_CTRL_TYPE_MENU:
 744                 v4l2_ctrl->minimum = 0;
 745                 v4l2_ctrl->maximum = mapping->menu_count - 1;
 746                 v4l2_ctrl->step = 1;
 747
 748                 menu = mapping->menu_info;
 749                 for (i = 0; i < mapping->menu_count; ++i, ++menu) {
 750                         if (menu->value == v4l2_ctrl->default_value) {
 751                                 v4l2_ctrl->default_value = i;
 752                                 break;
 753                         }
 754                 }
 755
 756                 ret = 0;
 757                 goto out;
 758
 759         case V4L2_CTRL_TYPE_BOOLEAN:
 760                 v4l2_ctrl->minimum = 0;
 761                 v4l2_ctrl->maximum = 1;
 762                 v4l2_ctrl->step = 1;
 763                 ret = 0;
 764                 goto out;
 765
 766         default:
 767                 break;
 768         }
 769
 770         if (ctrl->info->flags & UVC_CONTROL_GET_MIN) {
 771                 if ((ret = uvc_query_ctrl(video->dev, GET_MIN, ctrl->entity->id,
 772                                 video->dev->intfnum, ctrl->info->selector,
 773                                 data, ctrl->info->size)) < 0)
 774                         goto out;
 775                 v4l2_ctrl->minimum = uvc_get_le_value(data, mapping);
 776         }
 777         if (ctrl->info->flags & UVC_CONTROL_GET_MAX) {
 778                 if ((ret = uvc_query_ctrl(video->dev, GET_MAX, ctrl->entity->id,
 779                                 video->dev->intfnum, ctrl->info->selector,
 780                                 data, ctrl->info->size)) < 0)
 781                         goto out;
 782                 v4l2_ctrl->maximum = uvc_get_le_value(data, mapping);
 783         }
 784         if (ctrl->info->flags & UVC_CONTROL_GET_RES) {
 785                 if ((ret = uvc_query_ctrl(video->dev, GET_RES, ctrl->entity->id,
 786                                 video->dev->intfnum, ctrl->info->selector,
 787                                 data, ctrl->info->size)) < 0)
 788                         goto out;
 789                 v4l2_ctrl->step = uvc_get_le_value(data, mapping);
 790         }
 791
 792         ret = 0;
 793 out:
 794         kfree(data);
 795         return ret;
 796 }
 797
 798
 799 /* --------------------------------------------------------------------------
 800  * Control transactions
 801  *
 802  * To make extended set operations as atomic as the hardware allows, controls
 803  * are handled using begin/commit/rollback operations.
 804  *
 805  * At the beginning of a set request, uvc_ctrl_begin should be called to
 806  * initialize the request. This function acquires the control lock.
 807  *
 808  * When setting a control, the new value is stored in the control data field
 809  * at position UVC_CTRL_DATA_CURRENT. The control is then marked as dirty for
 810  * later processing. If the UVC and V4L2 control sizes differ, the current
 811  * value is loaded from the hardware before storing the new value in the data
 812  * field.
 813  *
 814  * After processing all controls in the transaction, uvc_ctrl_commit or
 815  * uvc_ctrl_rollback must be called to apply the pending changes to the
 816  * hardware or revert them. When applying changes, all controls marked as
 817  * dirty will be modified in the UVC device, and the dirty flag will be
 818  * cleared. When reverting controls, the control data field
 819  * UVC_CTRL_DATA_CURRENT is reverted to its previous value
 820  * (UVC_CTRL_DATA_BACKUP) for all dirty controls. Both functions release the
 821  * control lock.
 822  */
 823 int uvc_ctrl_begin(struct uvc_video_device *video)
 824 {
 825         return mutex_lock_interruptible(&video->ctrl_mutex) ? -ERESTARTSYS : 0;
 826 }
 827
 828 static int uvc_ctrl_commit_entity(struct uvc_device *dev,
 829         struct uvc_entity *entity, int rollback)
 830 {
 831         struct uvc_control *ctrl;
 832         unsigned int i;
 833         int ret;
 834
 835         if (entity == NULL)
 836                 return 0;
 837
 838         for (i = 0; i < entity->ncontrols; ++i) {
 839                 ctrl = &entity->controls[i];
 840                 if (ctrl->info == NULL)
 841                         continue;
 842
 843                 /* Reset the loaded flag for auto-update controls that were
 844                  * marked as loaded in uvc_ctrl_get/uvc_ctrl_set to prevent
 845                  * uvc_ctrl_get from using the cached value.
 846                  */
 847                 if (ctrl->info->flags & UVC_CONTROL_AUTO_UPDATE)
 848                         ctrl->loaded = 0;
 849
 850                 if (!ctrl->dirty)
 851                         continue;
 852
 853                 if (!rollback)
 854                         ret = uvc_query_ctrl(dev, SET_CUR, ctrl->entity->id,
 855                                 dev->intfnum, ctrl->info->selector,
 856                                 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
 857                                 ctrl->info->size);
 858                 else
 859                         ret = 0;
 860
 861                 if (rollback || ret < 0)
 862                         memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
 863                                uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
 864                                ctrl->info->size);
 865
 866                 ctrl->dirty = 0;
 867
 868                 if (ret < 0)
 869                         return ret;
 870         }
 871
 872         return 0;
 873 }
 874
 875 int __uvc_ctrl_commit(struct uvc_video_device *video, int rollback)
 876 {
 877         struct uvc_entity *entity;
 878         int ret = 0;
 879
 880         /* Find the control. */
 881         ret = uvc_ctrl_commit_entity(video->dev, video->processing, rollback);
 882         if (ret < 0)
 883                 goto done;
 884
 885         list_for_each_entry(entity, &video->iterms, chain) {
 886                 ret = uvc_ctrl_commit_entity(video->dev, entity, rollback);
 887                 if (ret < 0)
 888                         goto done;
 889         }
 890
 891         list_for_each_entry(entity, &video->extensions, chain) {
 892                 ret = uvc_ctrl_commit_entity(video->dev, entity, rollback);
 893                 if (ret < 0)
 894                         goto done;
 895         }
 896
 897 done:
 898         mutex_unlock(&video->ctrl_mutex);
 899         return ret;
 900 }
 901
 902 int uvc_ctrl_get(struct uvc_video_device *video,
 903         struct v4l2_ext_control *xctrl)
 904 {
 905         struct uvc_control *ctrl;
 906         struct uvc_control_mapping *mapping;
 907         struct uvc_menu_info *menu;
 908         unsigned int i;
 909         int ret;
 910
 911         ctrl = uvc_find_control(video, xctrl->id, &mapping);
 912         if (ctrl == NULL || (ctrl->info->flags & UVC_CONTROL_GET_CUR) == 0)
 913                 return -EINVAL;
 914
 915         if (!ctrl->loaded) {
 916                 ret = uvc_query_ctrl(video->dev, GET_CUR, ctrl->entity->id,
 917                                 video->dev->intfnum, ctrl->info->selector,
 918                                 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
 919                                 ctrl->info->size);
 920                 if (ret < 0)
 921                         return ret;
 922
 923                 ctrl->loaded = 1;
 924         }
 925
 926         xctrl->value = uvc_get_le_value(
 927                 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT), mapping);
 928
 929         if (mapping->v4l2_type == V4L2_CTRL_TYPE_MENU) {
 930                 menu = mapping->menu_info;
 931                 for (i = 0; i < mapping->menu_count; ++i, ++menu) {
 932                         if (menu->value == xctrl->value) {
 933                                 xctrl->value = i;
 934                                 break;
 935                         }
 936                 }
 937         }
 938
 939         return 0;
 940 }
 941
 942 int uvc_ctrl_set(struct uvc_video_device *video,
 943         struct v4l2_ext_control *xctrl)
 944 {
 945         struct uvc_control *ctrl;
 946         struct uvc_control_mapping *mapping;
 947         s32 value = xctrl->value;
 948         int ret;
 949
 950         ctrl = uvc_find_control(video, xctrl->id, &mapping);
 951         if (ctrl == NULL || (ctrl->info->flags & UVC_CONTROL_SET_CUR) == 0)
 952                 return -EINVAL;
 953
 954         if (mapping->v4l2_type == V4L2_CTRL_TYPE_MENU) {
 955                 if (value < 0 || value >= mapping->menu_count)
 956                         return -EINVAL;
 957                 value = mapping->menu_info[value].value;
 958         }
 959
 960         if (!ctrl->loaded && (ctrl->info->size * 8) != mapping->size) {
 961                 if ((ctrl->info->flags & UVC_CONTROL_GET_CUR) == 0) {
 962                         memset(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
 963                                 0, ctrl->info->size);
 964                 } else {
 965                         ret = uvc_query_ctrl(video->dev, GET_CUR,
 966                                 ctrl->entity->id, video->dev->intfnum,
 967                                 ctrl->info->selector,
 968                                 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
 969                                 ctrl->info->size);
 970                         if (ret < 0)
 971                                 return ret;
 972                 }
 973
 974                 ctrl->loaded = 1;
 975         }
 976
 977         if (!ctrl->dirty) {
 978                 memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
 979                        uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
 980                        ctrl->info->size);
 981         }
 982
 983         uvc_set_le_value(value,
 984                 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT), mapping);
 985
 986         ctrl->dirty = 1;
 987         ctrl->modified = 1;
 988         return 0;
 989 }
 990
 991 /* --------------------------------------------------------------------------
 992  * Dynamic controls
 993  */
 994
 995 int uvc_xu_ctrl_query(struct uvc_video_device *video,
 996         struct uvc_xu_control *xctrl, int set)
 997 {
 998         struct uvc_entity *entity;
 999         struct uvc_control *ctrl = NULL;
1000         unsigned int i, found = 0;
1001         __u8 *data;
1002         int ret;
1003
1004         /* Find the extension unit. */
1005         list_for_each_entry(entity, &video->extensions, chain) {
1006                 if (entity->id == xctrl->unit)
1007                         break;
1008         }
1009
1010         if (entity->id != xctrl->unit) {
1011                 uvc_trace(UVC_TRACE_CONTROL, "Extension unit %u not found.\n",
1012                         xctrl->unit);
1013                 return -EINVAL;
1014         }
1015
1016         /* Find the control. */
1017         for (i = 0; i < entity->ncontrols; ++i) {
1018                 ctrl = &entity->controls[i];
1019                 if (ctrl->info == NULL)
1020                         continue;
1021
1022                 if (ctrl->info->selector == xctrl->selector) {
1023                         found = 1;
1024                         break;
1025                 }
1026         }
1027
1028         if (!found) {
1029                 uvc_trace(UVC_TRACE_CONTROL,
1030                         "Control " UVC_GUID_FORMAT "/%u not found.\n",
1031                         UVC_GUID_ARGS(entity->extension.guidExtensionCode),
1032                         xctrl->selector);
1033                 return -EINVAL;
1034         }
1035
1036         /* Validate control data size. */
1037         if (ctrl->info->size != xctrl->size)
1038                 return -EINVAL;
1039
1040         if ((set && !(ctrl->info->flags & UVC_CONTROL_SET_CUR)) ||
1041             (!set && !(ctrl->info->flags & UVC_CONTROL_GET_CUR)))
1042                 return -EINVAL;
1043
1044         if (mutex_lock_interruptible(&video->ctrl_mutex))
1045                 return -ERESTARTSYS;
1046
1047         memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
1048                uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1049                xctrl->size);
1050         data = uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT);
1051
1052         if (set && copy_from_user(data, xctrl->data, xctrl->size)) {
1053                 ret = -EFAULT;
1054                 goto out;
1055         }
1056
1057         ret = uvc_query_ctrl(video->dev, set ? SET_CUR : GET_CUR, xctrl->unit,
1058                              video->dev->intfnum, xctrl->selector, data,
1059                              xctrl->size);
1060         if (ret < 0)
1061                 goto out;
1062
1063         if (!set && copy_to_user(xctrl->data, data, xctrl->size)) {
1064                 ret = -EFAULT;
1065                 goto out;
1066         }
1067
1068 out:
1069         if (ret)
1070                 memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1071                        uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
1072                        xctrl->size);
1073
1074         mutex_unlock(&video->ctrl_mutex);
1075         return ret;
1076 }
1077
1078 /* --------------------------------------------------------------------------
1079  * Suspend/resume
1080  */
1081
1082 /*
1083  * Restore control values after resume, skipping controls that haven't been
1084  * changed.
1085  *
1086  * TODO
1087  * - Don't restore modified controls that are back to their default value.
1088  * - Handle restore order (Auto-Exposure Mode should be restored before
1089  *   Exposure Time).
1090  */
1091 int uvc_ctrl_resume_device(struct uvc_device *dev)
1092 {
1093         struct uvc_control *ctrl;
1094         struct uvc_entity *entity;
1095         unsigned int i;
1096         int ret;
1097
1098         /* Walk the entities list and restore controls when possible. */
1099         list_for_each_entry(entity, &dev->entities, list) {
1100
1101                 for (i = 0; i < entity->ncontrols; ++i) {
1102                         ctrl = &entity->controls[i];
1103
1104                         if (ctrl->info == NULL || !ctrl->modified ||
1105                             (ctrl->info->flags & UVC_CONTROL_RESTORE) == 0)
1106                                 continue;
1107
1108                         printk(KERN_INFO "restoring control " UVC_GUID_FORMAT
1109                                 "/%u/%u\n", UVC_GUID_ARGS(ctrl->info->entity),
1110                                 ctrl->info->index, ctrl->info->selector);
1111                         ctrl->dirty = 1;
1112                 }
1113
1114                 ret = uvc_ctrl_commit_entity(dev, entity, 0);
1115                 if (ret < 0)
1116                         return ret;
1117         }
1118
1119         return 0;
1120 }
1121
1122 /* --------------------------------------------------------------------------
1123  * Control and mapping handling
1124  */
1125
1126 static void uvc_ctrl_add_ctrl(struct uvc_device *dev,
1127         struct uvc_control_info *info)
1128 {
1129         struct uvc_entity *entity;
1130         struct uvc_control *ctrl = NULL;
1131         int ret, found = 0;
1132         unsigned int i;
1133
1134         list_for_each_entry(entity, &dev->entities, list) {
1135                 if (!uvc_entity_match_guid(entity, info->entity))
1136                         continue;
1137
1138                 for (i = 0; i < entity->ncontrols; ++i) {
1139                         ctrl = &entity->controls[i];
1140                         if (ctrl->index == info->index) {
1141                                 found = 1;
1142                                 break;
1143                         }
1144                 }
1145
1146                 if (found)
1147                         break;
1148         }
1149
1150         if (!found)
1151                 return;
1152
1153         if (UVC_ENTITY_TYPE(entity) == VC_EXTENSION_UNIT) {
1154                 /* Check if the device control information and length match
1155                  * the user supplied information.
1156                  */
1157                 __u32 flags;
1158                 __le16 size;
1159                 __u8 inf;
1160
1161                 if ((ret = uvc_query_ctrl(dev, GET_LEN, ctrl->entity->id,
1162                         dev->intfnum, info->selector, (__u8 *)&size, 2)) < 0) {
1163                         uvc_trace(UVC_TRACE_CONTROL, "GET_LEN failed on "
1164                                 "control " UVC_GUID_FORMAT "/%u (%d).\n",
1165                                 UVC_GUID_ARGS(info->entity), info->selector,
1166                                 ret);
1167                         return;
1168                 }
1169
1170                 if (info->size != le16_to_cpu(size)) {
1171                         uvc_trace(UVC_TRACE_CONTROL, "Control " UVC_GUID_FORMAT
1172                                 "/%u size doesn't match user supplied "
1173                                 "value.\n", UVC_GUID_ARGS(info->entity),
1174                                 info->selector);
1175                         return;
1176                 }
1177
1178                 if ((ret = uvc_query_ctrl(dev, GET_INFO, ctrl->entity->id,
1179                         dev->intfnum, info->selector, &inf, 1)) < 0) {
1180                         uvc_trace(UVC_TRACE_CONTROL, "GET_INFO failed on "
1181                                 "control " UVC_GUID_FORMAT "/%u (%d).\n",
1182                                 UVC_GUID_ARGS(info->entity), info->selector,
1183                                 ret);
1184                         return;
1185                 }
1186
1187                 flags = info->flags;
1188                 if (((flags & UVC_CONTROL_GET_CUR) && !(inf & (1 << 0))) ||
1189                     ((flags & UVC_CONTROL_SET_CUR) && !(inf & (1 << 1)))) {
1190                         uvc_trace(UVC_TRACE_CONTROL, "Control "
1191                                 UVC_GUID_FORMAT "/%u flags don't match "
1192                                 "supported operations.\n",
1193                                 UVC_GUID_ARGS(info->entity), info->selector);
1194                         return;
1195                 }
1196         }
1197
1198         ctrl->info = info;
1199         ctrl->data = kmalloc(ctrl->info->size * UVC_CTRL_NDATA, GFP_KERNEL);
1200         uvc_trace(UVC_TRACE_CONTROL, "Added control " UVC_GUID_FORMAT "/%u "
1201                 "to device %s entity %u\n", UVC_GUID_ARGS(ctrl->info->entity),
1202                 ctrl->info->selector, dev->udev->devpath, entity->id);
1203 }
1204
1205 /*
1206  * Add an item to the UVC control information list, and instantiate a control
1207  * structure for each device that supports the control.
1208  */
1209 int uvc_ctrl_add_info(struct uvc_control_info *info)
1210 {
1211         struct uvc_control_info *ctrl;
1212         struct uvc_device *dev;
1213         int ret = 0;
1214
1215         /* Find matching controls by walking the devices, entities and
1216          * controls list.
1217          */
1218         mutex_lock(&uvc_driver.ctrl_mutex);
1219
1220         /* First check if the list contains a control matching the new one.
1221          * Bail out if it does.
1222          */
1223         list_for_each_entry(ctrl, &uvc_driver.controls, list) {
1224                 if (memcmp(ctrl->entity, info->entity, 16))
1225                         continue;
1226
1227                 if (ctrl->selector == info->selector) {
1228                         uvc_trace(UVC_TRACE_CONTROL, "Control "
1229                                 UVC_GUID_FORMAT "/%u is already defined.\n",
1230                                 UVC_GUID_ARGS(info->entity), info->selector);
1231                         ret = -EEXIST;
1232                         goto end;
1233                 }
1234                 if (ctrl->index == info->index) {
1235                         uvc_trace(UVC_TRACE_CONTROL, "Control "
1236                                 UVC_GUID_FORMAT "/%u would overwrite index "
1237                                 "%d.\n", UVC_GUID_ARGS(info->entity),
1238                                 info->selector, info->index);
1239                         ret = -EEXIST;
1240                         goto end;
1241                 }
1242         }
1243
1244         list_for_each_entry(dev, &uvc_driver.devices, list)
1245                 uvc_ctrl_add_ctrl(dev, info);
1246
1247         INIT_LIST_HEAD(&info->mappings);
1248         list_add_tail(&info->list, &uvc_driver.controls);
1249 end:
1250         mutex_unlock(&uvc_driver.ctrl_mutex);
1251         return ret;
1252 }
1253
1254 int uvc_ctrl_add_mapping(struct uvc_control_mapping *mapping)
1255 {
1256         struct uvc_control_info *info;
1257         struct uvc_control_mapping *map;
1258         int ret = -EINVAL;
1259
1260         if (mapping->id & ~V4L2_CTRL_ID_MASK) {
1261                 uvc_trace(UVC_TRACE_CONTROL, "Can't add mapping '%s' with "
1262                         "invalid control id 0x%08x\n", mapping->name,
1263                         mapping->id);
1264                 return -EINVAL;
1265         }
1266
1267         mutex_lock(&uvc_driver.ctrl_mutex);
1268         list_for_each_entry(info, &uvc_driver.controls, list) {
1269                 if (memcmp(info->entity, mapping->entity, 16) ||
1270                         info->selector != mapping->selector)
1271                         continue;
1272
1273                 if (info->size * 8 < mapping->size + mapping->offset) {
1274                         uvc_trace(UVC_TRACE_CONTROL, "Mapping '%s' would "
1275                                 "overflow control " UVC_GUID_FORMAT "/%u\n",
1276                                 mapping->name, UVC_GUID_ARGS(info->entity),
1277                                 info->selector);
1278                         ret = -EOVERFLOW;
1279                         goto end;
1280                 }
1281
1282                 /* Check if the list contains a mapping matching the new one.
1283                  * Bail out if it does.
1284                  */
1285                 list_for_each_entry(map, &info->mappings, list) {
1286                         if (map->id == mapping->id) {
1287                                 uvc_trace(UVC_TRACE_CONTROL, "Mapping '%s' is "
1288                                         "already defined.\n", mapping->name);
1289                                 ret = -EEXIST;
1290                                 goto end;
1291                         }
1292                 }
1293
1294                 mapping->ctrl = info;
1295                 list_add_tail(&mapping->list, &info->mappings);
1296                 uvc_trace(UVC_TRACE_CONTROL, "Adding mapping %s to control "
1297                         UVC_GUID_FORMAT "/%u.\n", mapping->name,
1298                         UVC_GUID_ARGS(info->entity), info->selector);
1299
1300                 ret = 0;
1301                 break;
1302         }
1303 end:
1304         mutex_unlock(&uvc_driver.ctrl_mutex);
1305         return ret;
1306 }
1307
1308 /*
1309  * Initialize device controls.
1310  */
1311 int uvc_ctrl_init_device(struct uvc_device *dev)
1312 {
1313         struct uvc_control_info *info;
1314         struct uvc_control *ctrl;
1315         struct uvc_entity *entity;
1316         unsigned int i;
1317
1318         /* Walk the entities list and instantiate controls */
1319         list_for_each_entry(entity, &dev->entities, list) {
1320                 unsigned int bControlSize = 0, ncontrols = 0;
1321                 __u8 *bmControls = NULL;
1322
1323                 if (UVC_ENTITY_TYPE(entity) == VC_EXTENSION_UNIT) {
1324                         bmControls = entity->extension.bmControls;
1325                         bControlSize = entity->extension.bControlSize;
1326                 } else if (UVC_ENTITY_TYPE(entity) == VC_PROCESSING_UNIT) {
1327                         bmControls = entity->processing.bmControls;
1328                         bControlSize = entity->processing.bControlSize;
1329                 } else if (UVC_ENTITY_TYPE(entity) == ITT_CAMERA) {
1330                         bmControls = entity->camera.bmControls;
1331                         bControlSize = entity->camera.bControlSize;
1332                 }
1333
1334                 for (i = 0; i < bControlSize; ++i)
1335                         ncontrols += hweight8(bmControls[i]);
1336
1337                 if (ncontrols == 0)
1338                         continue;
1339
1340                 entity->controls = kzalloc(ncontrols*sizeof *ctrl, GFP_KERNEL);
1341                 if (entity->controls == NULL)
1342                         return -ENOMEM;
1343
1344                 entity->ncontrols = ncontrols;
1345
1346                 ctrl = entity->controls;
1347                 for (i = 0; i < bControlSize * 8; ++i) {
1348                         if (uvc_get_bit(bmControls, i) == 0)
1349                                 continue;
1350
1351                         ctrl->entity = entity;
1352                         ctrl->index = i;
1353                         ctrl++;
1354                 }
1355         }
1356
1357         /* Walk the controls info list and associate them with the device
1358          * controls, then add the device to the global device list. This has
1359          * to be done while holding the controls lock, to make sure
1360          * uvc_ctrl_add_info() will not get called in-between.
1361          */
1362         mutex_lock(&uvc_driver.ctrl_mutex);
1363         list_for_each_entry(info, &uvc_driver.controls, list)
1364                 uvc_ctrl_add_ctrl(dev, info);
1365
1366         list_add_tail(&dev->list, &uvc_driver.devices);
1367         mutex_unlock(&uvc_driver.ctrl_mutex);
1368
1369         return 0;
1370 }
1371
1372 /*
1373  * Cleanup device controls.
1374  */
1375 void uvc_ctrl_cleanup_device(struct uvc_device *dev)
1376 {
1377         struct uvc_entity *entity;
1378         unsigned int i;
1379
1380         /* Remove the device from the global devices list */
1381         mutex_lock(&uvc_driver.ctrl_mutex);
1382         if (dev->list.next != NULL)
1383                 list_del(&dev->list);
1384         mutex_unlock(&uvc_driver.ctrl_mutex);
1385
1386         list_for_each_entry(entity, &dev->entities, list) {
1387                 for (i = 0; i < entity->ncontrols; ++i)
1388                         kfree(entity->controls[i].data);
1389
1390                 kfree(entity->controls);
1391         }
1392 }
1393
1394 void uvc_ctrl_init(void)
1395 {
1396         struct uvc_control_info *ctrl = uvc_ctrls;
1397         struct uvc_control_info *cend = ctrl + ARRAY_SIZE(uvc_ctrls);
1398         struct uvc_control_mapping *mapping = uvc_ctrl_mappings;
1399         struct uvc_control_mapping *mend =
1400                 mapping + ARRAY_SIZE(uvc_ctrl_mappings);
1401
1402         for (; ctrl < cend; ++ctrl)
1403                 uvc_ctrl_add_info(ctrl);
1404
1405         for (; mapping < mend; ++mapping)
1406                 uvc_ctrl_add_mapping(mapping);
1407 }
1408