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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 __s32 uvc_ctrl_get_zoom(struct uvc_control_mapping *mapping,
 331         __u8 query, const __u8 *data)
 332 {
 333         __s8 zoom = (__s8)data[0];
 334
 335         switch (query) {
 336         case GET_CUR:
 337                 return (zoom == 0) ? 0 : (zoom > 0 ? data[2] : -data[2]);
 338
 339         case GET_MIN:
 340         case GET_MAX:
 341         case GET_RES:
 342         case GET_DEF:
 343         default:
 344                 return data[2];
 345         }
 346 }
 347
 348 static void uvc_ctrl_set_zoom(struct uvc_control_mapping *mapping,
 349         __s32 value, __u8 *data)
 350 {
 351         data[0] = value == 0 ? 0 : (value > 0) ? 1 : 0xff;
 352         data[2] = min(abs(value), 0xff);
 353 }
 354
 355 static struct uvc_control_mapping uvc_ctrl_mappings[] = {
 356         {
 357                 .id             = V4L2_CID_BRIGHTNESS,
 358                 .name           = "Brightness",
 359                 .entity         = UVC_GUID_UVC_PROCESSING,
 360                 .selector       = PU_BRIGHTNESS_CONTROL,
 361                 .size           = 16,
 362                 .offset         = 0,
 363                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 364                 .data_type      = UVC_CTRL_DATA_TYPE_SIGNED,
 365         },
 366         {
 367                 .id             = V4L2_CID_CONTRAST,
 368                 .name           = "Contrast",
 369                 .entity         = UVC_GUID_UVC_PROCESSING,
 370                 .selector       = PU_CONTRAST_CONTROL,
 371                 .size           = 16,
 372                 .offset         = 0,
 373                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 374                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 375         },
 376         {
 377                 .id             = V4L2_CID_HUE,
 378                 .name           = "Hue",
 379                 .entity         = UVC_GUID_UVC_PROCESSING,
 380                 .selector       = PU_HUE_CONTROL,
 381                 .size           = 16,
 382                 .offset         = 0,
 383                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 384                 .data_type      = UVC_CTRL_DATA_TYPE_SIGNED,
 385         },
 386         {
 387                 .id             = V4L2_CID_SATURATION,
 388                 .name           = "Saturation",
 389                 .entity         = UVC_GUID_UVC_PROCESSING,
 390                 .selector       = PU_SATURATION_CONTROL,
 391                 .size           = 16,
 392                 .offset         = 0,
 393                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 394                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 395         },
 396         {
 397                 .id             = V4L2_CID_SHARPNESS,
 398                 .name           = "Sharpness",
 399                 .entity         = UVC_GUID_UVC_PROCESSING,
 400                 .selector       = PU_SHARPNESS_CONTROL,
 401                 .size           = 16,
 402                 .offset         = 0,
 403                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 404                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 405         },
 406         {
 407                 .id             = V4L2_CID_GAMMA,
 408                 .name           = "Gamma",
 409                 .entity         = UVC_GUID_UVC_PROCESSING,
 410                 .selector       = PU_GAMMA_CONTROL,
 411                 .size           = 16,
 412                 .offset         = 0,
 413                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 414                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 415         },
 416         {
 417                 .id             = V4L2_CID_BACKLIGHT_COMPENSATION,
 418                 .name           = "Backlight Compensation",
 419                 .entity         = UVC_GUID_UVC_PROCESSING,
 420                 .selector       = PU_BACKLIGHT_COMPENSATION_CONTROL,
 421                 .size           = 16,
 422                 .offset         = 0,
 423                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 424                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 425         },
 426         {
 427                 .id             = V4L2_CID_GAIN,
 428                 .name           = "Gain",
 429                 .entity         = UVC_GUID_UVC_PROCESSING,
 430                 .selector       = PU_GAIN_CONTROL,
 431                 .size           = 16,
 432                 .offset         = 0,
 433                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 434                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 435         },
 436         {
 437                 .id             = V4L2_CID_POWER_LINE_FREQUENCY,
 438                 .name           = "Power Line Frequency",
 439                 .entity         = UVC_GUID_UVC_PROCESSING,
 440                 .selector       = PU_POWER_LINE_FREQUENCY_CONTROL,
 441                 .size           = 2,
 442                 .offset         = 0,
 443                 .v4l2_type      = V4L2_CTRL_TYPE_MENU,
 444                 .data_type      = UVC_CTRL_DATA_TYPE_ENUM,
 445                 .menu_info      = power_line_frequency_controls,
 446                 .menu_count     = ARRAY_SIZE(power_line_frequency_controls),
 447         },
 448         {
 449                 .id             = V4L2_CID_HUE_AUTO,
 450                 .name           = "Hue, Auto",
 451                 .entity         = UVC_GUID_UVC_PROCESSING,
 452                 .selector       = PU_HUE_AUTO_CONTROL,
 453                 .size           = 1,
 454                 .offset         = 0,
 455                 .v4l2_type      = V4L2_CTRL_TYPE_BOOLEAN,
 456                 .data_type      = UVC_CTRL_DATA_TYPE_BOOLEAN,
 457         },
 458         {
 459                 .id             = V4L2_CID_EXPOSURE_AUTO,
 460                 .name           = "Exposure, Auto",
 461                 .entity         = UVC_GUID_UVC_CAMERA,
 462                 .selector       = CT_AE_MODE_CONTROL,
 463                 .size           = 4,
 464                 .offset         = 0,
 465                 .v4l2_type      = V4L2_CTRL_TYPE_MENU,
 466                 .data_type      = UVC_CTRL_DATA_TYPE_BITMASK,
 467                 .menu_info      = exposure_auto_controls,
 468                 .menu_count     = ARRAY_SIZE(exposure_auto_controls),
 469         },
 470         {
 471                 .id             = V4L2_CID_EXPOSURE_AUTO_PRIORITY,
 472                 .name           = "Exposure, Auto Priority",
 473                 .entity         = UVC_GUID_UVC_CAMERA,
 474                 .selector       = CT_AE_PRIORITY_CONTROL,
 475                 .size           = 1,
 476                 .offset         = 0,
 477                 .v4l2_type      = V4L2_CTRL_TYPE_BOOLEAN,
 478                 .data_type      = UVC_CTRL_DATA_TYPE_BOOLEAN,
 479         },
 480         {
 481                 .id             = V4L2_CID_EXPOSURE_ABSOLUTE,
 482                 .name           = "Exposure (Absolute)",
 483                 .entity         = UVC_GUID_UVC_CAMERA,
 484                 .selector       = CT_EXPOSURE_TIME_ABSOLUTE_CONTROL,
 485                 .size           = 32,
 486                 .offset         = 0,
 487                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 488                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 489         },
 490         {
 491                 .id             = V4L2_CID_AUTO_WHITE_BALANCE,
 492                 .name           = "White Balance Temperature, Auto",
 493                 .entity         = UVC_GUID_UVC_PROCESSING,
 494                 .selector       = PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL,
 495                 .size           = 1,
 496                 .offset         = 0,
 497                 .v4l2_type      = V4L2_CTRL_TYPE_BOOLEAN,
 498                 .data_type      = UVC_CTRL_DATA_TYPE_BOOLEAN,
 499         },
 500         {
 501                 .id             = V4L2_CID_WHITE_BALANCE_TEMPERATURE,
 502                 .name           = "White Balance Temperature",
 503                 .entity         = UVC_GUID_UVC_PROCESSING,
 504                 .selector       = PU_WHITE_BALANCE_TEMPERATURE_CONTROL,
 505                 .size           = 16,
 506                 .offset         = 0,
 507                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 508                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 509         },
 510         {
 511                 .id             = V4L2_CID_AUTO_WHITE_BALANCE,
 512                 .name           = "White Balance Component, Auto",
 513                 .entity         = UVC_GUID_UVC_PROCESSING,
 514                 .selector       = PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL,
 515                 .size           = 1,
 516                 .offset         = 0,
 517                 .v4l2_type      = V4L2_CTRL_TYPE_BOOLEAN,
 518                 .data_type      = UVC_CTRL_DATA_TYPE_BOOLEAN,
 519         },
 520         {
 521                 .id             = V4L2_CID_BLUE_BALANCE,
 522                 .name           = "White Balance Blue Component",
 523                 .entity         = UVC_GUID_UVC_PROCESSING,
 524                 .selector       = PU_WHITE_BALANCE_COMPONENT_CONTROL,
 525                 .size           = 16,
 526                 .offset         = 0,
 527                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 528                 .data_type      = UVC_CTRL_DATA_TYPE_SIGNED,
 529         },
 530         {
 531                 .id             = V4L2_CID_RED_BALANCE,
 532                 .name           = "White Balance Red Component",
 533                 .entity         = UVC_GUID_UVC_PROCESSING,
 534                 .selector       = PU_WHITE_BALANCE_COMPONENT_CONTROL,
 535                 .size           = 16,
 536                 .offset         = 16,
 537                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 538                 .data_type      = UVC_CTRL_DATA_TYPE_SIGNED,
 539         },
 540         {
 541                 .id             = V4L2_CID_FOCUS_ABSOLUTE,
 542                 .name           = "Focus (absolute)",
 543                 .entity         = UVC_GUID_UVC_CAMERA,
 544                 .selector       = CT_FOCUS_ABSOLUTE_CONTROL,
 545                 .size           = 16,
 546                 .offset         = 0,
 547                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 548                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 549         },
 550         {
 551                 .id             = V4L2_CID_FOCUS_AUTO,
 552                 .name           = "Focus, Auto",
 553                 .entity         = UVC_GUID_UVC_CAMERA,
 554                 .selector       = CT_FOCUS_AUTO_CONTROL,
 555                 .size           = 1,
 556                 .offset         = 0,
 557                 .v4l2_type      = V4L2_CTRL_TYPE_BOOLEAN,
 558                 .data_type      = UVC_CTRL_DATA_TYPE_BOOLEAN,
 559         },
 560         {
 561                 .id             = V4L2_CID_ZOOM_ABSOLUTE,
 562                 .name           = "Zoom, Absolute",
 563                 .entity         = UVC_GUID_UVC_CAMERA,
 564                 .selector       = CT_ZOOM_ABSOLUTE_CONTROL,
 565                 .size           = 16,
 566                 .offset         = 0,
 567                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 568                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 569         },
 570         {
 571                 .id             = V4L2_CID_ZOOM_CONTINUOUS,
 572                 .name           = "Zoom, Continuous",
 573                 .entity         = UVC_GUID_UVC_CAMERA,
 574                 .selector       = CT_ZOOM_RELATIVE_CONTROL,
 575                 .size           = 0,
 576                 .offset         = 0,
 577                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 578                 .data_type      = UVC_CTRL_DATA_TYPE_SIGNED,
 579                 .get            = uvc_ctrl_get_zoom,
 580                 .set            = uvc_ctrl_set_zoom,
 581         },
 582         {
 583                 .id             = V4L2_CID_PRIVACY,
 584                 .name           = "Privacy",
 585                 .entity         = UVC_GUID_UVC_CAMERA,
 586                 .selector       = CT_PRIVACY_CONTROL,
 587                 .size           = 1,
 588                 .offset         = 0,
 589                 .v4l2_type      = V4L2_CTRL_TYPE_BOOLEAN,
 590                 .data_type      = UVC_CTRL_DATA_TYPE_BOOLEAN,
 591         },
 592 };
 593
 594 /* ------------------------------------------------------------------------
 595  * Utility functions
 596  */
 597
 598 static inline __u8 *uvc_ctrl_data(struct uvc_control *ctrl, int id)
 599 {
 600         return ctrl->data + id * ctrl->info->size;
 601 }
 602
 603 static inline int uvc_test_bit(const __u8 *data, int bit)
 604 {
 605         return (data[bit >> 3] >> (bit & 7)) & 1;
 606 }
 607
 608 static inline void uvc_clear_bit(__u8 *data, int bit)
 609 {
 610         data[bit >> 3] &= ~(1 << (bit & 7));
 611 }
 612
 613 /* Extract the bit string specified by mapping->offset and mapping->size
 614  * from the little-endian data stored at 'data' and return the result as
 615  * a signed 32bit integer. Sign extension will be performed if the mapping
 616  * references a signed data type.
 617  */
 618 static __s32 uvc_get_le_value(struct uvc_control_mapping *mapping,
 619         __u8 query, const __u8 *data)
 620 {
 621         int bits = mapping->size;
 622         int offset = mapping->offset;
 623         __s32 value = 0;
 624         __u8 mask;
 625
 626         data += offset / 8;
 627         offset &= 7;
 628         mask = ((1LL << bits) - 1) << offset;
 629
 630         for (; bits > 0; data++) {
 631                 __u8 byte = *data & mask;
 632                 value |= offset > 0 ? (byte >> offset) : (byte << (-offset));
 633                 bits -= 8 - (offset > 0 ? offset : 0);
 634                 offset -= 8;
 635                 mask = (1 << bits) - 1;
 636         }
 637
 638         /* Sign-extend the value if needed */
 639         if (mapping->data_type == UVC_CTRL_DATA_TYPE_SIGNED)
 640                 value |= -(value & (1 << (mapping->size - 1)));
 641
 642         return value;
 643 }
 644
 645 /* Set the bit string specified by mapping->offset and mapping->size
 646  * in the little-endian data stored at 'data' to the value 'value'.
 647  */
 648 static void uvc_set_le_value(struct uvc_control_mapping *mapping,
 649         __s32 value, __u8 *data)
 650 {
 651         int bits = mapping->size;
 652         int offset = mapping->offset;
 653         __u8 mask;
 654
 655         data += offset / 8;
 656         offset &= 7;
 657
 658         for (; bits > 0; data++) {
 659                 mask = ((1LL << bits) - 1) << offset;
 660                 *data = (*data & ~mask) | ((value << offset) & mask);
 661                 value >>= offset ? offset : 8;
 662                 bits -= 8 - offset;
 663                 offset = 0;
 664         }
 665 }
 666
 667 /* ------------------------------------------------------------------------
 668  * Terminal and unit management
 669  */
 670
 671 static const __u8 uvc_processing_guid[16] = UVC_GUID_UVC_PROCESSING;
 672 static const __u8 uvc_camera_guid[16] = UVC_GUID_UVC_CAMERA;
 673 static const __u8 uvc_media_transport_input_guid[16] =
 674         UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT;
 675
 676 static int uvc_entity_match_guid(struct uvc_entity *entity, __u8 guid[16])
 677 {
 678         switch (UVC_ENTITY_TYPE(entity)) {
 679         case ITT_CAMERA:
 680                 return memcmp(uvc_camera_guid, guid, 16) == 0;
 681
 682         case ITT_MEDIA_TRANSPORT_INPUT:
 683                 return memcmp(uvc_media_transport_input_guid, guid, 16) == 0;
 684
 685         case VC_PROCESSING_UNIT:
 686                 return memcmp(uvc_processing_guid, guid, 16) == 0;
 687
 688         case VC_EXTENSION_UNIT:
 689                 return memcmp(entity->extension.guidExtensionCode,
 690                               guid, 16) == 0;
 691
 692         default:
 693                 return 0;
 694         }
 695 }
 696
 697 /* ------------------------------------------------------------------------
 698  * UVC Controls
 699  */
 700
 701 static void __uvc_find_control(struct uvc_entity *entity, __u32 v4l2_id,
 702         struct uvc_control_mapping **mapping, struct uvc_control **control,
 703         int next)
 704 {
 705         struct uvc_control *ctrl;
 706         struct uvc_control_mapping *map;
 707         unsigned int i;
 708
 709         if (entity == NULL)
 710                 return;
 711
 712         for (i = 0; i < entity->ncontrols; ++i) {
 713                 ctrl = &entity->controls[i];
 714                 if (ctrl->info == NULL)
 715                         continue;
 716
 717                 list_for_each_entry(map, &ctrl->info->mappings, list) {
 718                         if ((map->id == v4l2_id) && !next) {
 719                                 *control = ctrl;
 720                                 *mapping = map;
 721                                 return;
 722                         }
 723
 724                         if ((*mapping == NULL || (*mapping)->id > map->id) &&
 725                             (map->id > v4l2_id) && next) {
 726                                 *control = ctrl;
 727                                 *mapping = map;
 728                         }
 729                 }
 730         }
 731 }
 732
 733 struct uvc_control *uvc_find_control(struct uvc_video_device *video,
 734         __u32 v4l2_id, struct uvc_control_mapping **mapping)
 735 {
 736         struct uvc_control *ctrl = NULL;
 737         struct uvc_entity *entity;
 738         int next = v4l2_id & V4L2_CTRL_FLAG_NEXT_CTRL;
 739
 740         *mapping = NULL;
 741
 742         /* Mask the query flags. */
 743         v4l2_id &= V4L2_CTRL_ID_MASK;
 744
 745         /* Find the control. */
 746         __uvc_find_control(video->processing, v4l2_id, mapping, &ctrl, next);
 747         if (ctrl && !next)
 748                 return ctrl;
 749
 750         list_for_each_entry(entity, &video->iterms, chain) {
 751                 __uvc_find_control(entity, v4l2_id, mapping, &ctrl, next);
 752                 if (ctrl && !next)
 753                         return ctrl;
 754         }
 755
 756         list_for_each_entry(entity, &video->extensions, chain) {
 757                 __uvc_find_control(entity, v4l2_id, mapping, &ctrl, next);
 758                 if (ctrl && !next)
 759                         return ctrl;
 760         }
 761
 762         if (ctrl == NULL && !next)
 763                 uvc_trace(UVC_TRACE_CONTROL, "Control 0x%08x not found.\n",
 764                                 v4l2_id);
 765
 766         return ctrl;
 767 }
 768
 769 int uvc_query_v4l2_ctrl(struct uvc_video_device *video,
 770         struct v4l2_queryctrl *v4l2_ctrl)
 771 {
 772         struct uvc_control *ctrl;
 773         struct uvc_control_mapping *mapping;
 774         struct uvc_menu_info *menu;
 775         unsigned int i;
 776         __u8 *data;
 777         int ret;
 778
 779         ctrl = uvc_find_control(video, v4l2_ctrl->id, &mapping);
 780         if (ctrl == NULL)
 781                 return -EINVAL;
 782
 783         data = kmalloc(ctrl->info->size, GFP_KERNEL);
 784         if (data == NULL)
 785                 return -ENOMEM;
 786
 787         memset(v4l2_ctrl, 0, sizeof *v4l2_ctrl);
 788         v4l2_ctrl->id = mapping->id;
 789         v4l2_ctrl->type = mapping->v4l2_type;
 790         strncpy(v4l2_ctrl->name, mapping->name, sizeof v4l2_ctrl->name);
 791         v4l2_ctrl->flags = 0;
 792
 793         if (!(ctrl->info->flags & UVC_CONTROL_SET_CUR))
 794                 v4l2_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
 795
 796         if (ctrl->info->flags & UVC_CONTROL_GET_DEF) {
 797                 if ((ret = uvc_query_ctrl(video->dev, GET_DEF, ctrl->entity->id,
 798                                 video->dev->intfnum, ctrl->info->selector,
 799                                 data, ctrl->info->size)) < 0)
 800                         goto out;
 801                 v4l2_ctrl->default_value = mapping->get(mapping, GET_DEF, data);
 802         }
 803
 804         switch (mapping->v4l2_type) {
 805         case V4L2_CTRL_TYPE_MENU:
 806                 v4l2_ctrl->minimum = 0;
 807                 v4l2_ctrl->maximum = mapping->menu_count - 1;
 808                 v4l2_ctrl->step = 1;
 809
 810                 menu = mapping->menu_info;
 811                 for (i = 0; i < mapping->menu_count; ++i, ++menu) {
 812                         if (menu->value == v4l2_ctrl->default_value) {
 813                                 v4l2_ctrl->default_value = i;
 814                                 break;
 815                         }
 816                 }
 817
 818                 ret = 0;
 819                 goto out;
 820
 821         case V4L2_CTRL_TYPE_BOOLEAN:
 822                 v4l2_ctrl->minimum = 0;
 823                 v4l2_ctrl->maximum = 1;
 824                 v4l2_ctrl->step = 1;
 825                 ret = 0;
 826                 goto out;
 827
 828         default:
 829                 break;
 830         }
 831
 832         if (ctrl->info->flags & UVC_CONTROL_GET_MIN) {
 833                 if ((ret = uvc_query_ctrl(video->dev, GET_MIN, ctrl->entity->id,
 834                                 video->dev->intfnum, ctrl->info->selector,
 835                                 data, ctrl->info->size)) < 0)
 836                         goto out;
 837                 v4l2_ctrl->minimum = mapping->get(mapping, GET_MIN, data);
 838         }
 839         if (ctrl->info->flags & UVC_CONTROL_GET_MAX) {
 840                 if ((ret = uvc_query_ctrl(video->dev, GET_MAX, ctrl->entity->id,
 841                                 video->dev->intfnum, ctrl->info->selector,
 842                                 data, ctrl->info->size)) < 0)
 843                         goto out;
 844                 v4l2_ctrl->maximum = mapping->get(mapping, GET_MAX, data);
 845         }
 846         if (ctrl->info->flags & UVC_CONTROL_GET_RES) {
 847                 if ((ret = uvc_query_ctrl(video->dev, GET_RES, ctrl->entity->id,
 848                                 video->dev->intfnum, ctrl->info->selector,
 849                                 data, ctrl->info->size)) < 0)
 850                         goto out;
 851                 v4l2_ctrl->step = mapping->get(mapping, GET_RES, data);
 852         }
 853
 854         ret = 0;
 855 out:
 856         kfree(data);
 857         return ret;
 858 }
 859
 860
 861 /* --------------------------------------------------------------------------
 862  * Control transactions
 863  *
 864  * To make extended set operations as atomic as the hardware allows, controls
 865  * are handled using begin/commit/rollback operations.
 866  *
 867  * At the beginning of a set request, uvc_ctrl_begin should be called to
 868  * initialize the request. This function acquires the control lock.
 869  *
 870  * When setting a control, the new value is stored in the control data field
 871  * at position UVC_CTRL_DATA_CURRENT. The control is then marked as dirty for
 872  * later processing. If the UVC and V4L2 control sizes differ, the current
 873  * value is loaded from the hardware before storing the new value in the data
 874  * field.
 875  *
 876  * After processing all controls in the transaction, uvc_ctrl_commit or
 877  * uvc_ctrl_rollback must be called to apply the pending changes to the
 878  * hardware or revert them. When applying changes, all controls marked as
 879  * dirty will be modified in the UVC device, and the dirty flag will be
 880  * cleared. When reverting controls, the control data field
 881  * UVC_CTRL_DATA_CURRENT is reverted to its previous value
 882  * (UVC_CTRL_DATA_BACKUP) for all dirty controls. Both functions release the
 883  * control lock.
 884  */
 885 int uvc_ctrl_begin(struct uvc_video_device *video)
 886 {
 887         return mutex_lock_interruptible(&video->ctrl_mutex) ? -ERESTARTSYS : 0;
 888 }
 889
 890 static int uvc_ctrl_commit_entity(struct uvc_device *dev,
 891         struct uvc_entity *entity, int rollback)
 892 {
 893         struct uvc_control *ctrl;
 894         unsigned int i;
 895         int ret;
 896
 897         if (entity == NULL)
 898                 return 0;
 899
 900         for (i = 0; i < entity->ncontrols; ++i) {
 901                 ctrl = &entity->controls[i];
 902                 if (ctrl->info == NULL)
 903                         continue;
 904
 905                 /* Reset the loaded flag for auto-update controls that were
 906                  * marked as loaded in uvc_ctrl_get/uvc_ctrl_set to prevent
 907                  * uvc_ctrl_get from using the cached value.
 908                  */
 909                 if (ctrl->info->flags & UVC_CONTROL_AUTO_UPDATE)
 910                         ctrl->loaded = 0;
 911
 912                 if (!ctrl->dirty)
 913                         continue;
 914
 915                 if (!rollback)
 916                         ret = uvc_query_ctrl(dev, SET_CUR, ctrl->entity->id,
 917                                 dev->intfnum, ctrl->info->selector,
 918                                 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
 919                                 ctrl->info->size);
 920                 else
 921                         ret = 0;
 922
 923                 if (rollback || ret < 0)
 924                         memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
 925                                uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
 926                                ctrl->info->size);
 927
 928                 ctrl->dirty = 0;
 929
 930                 if (ret < 0)
 931                         return ret;
 932         }
 933
 934         return 0;
 935 }
 936
 937 int __uvc_ctrl_commit(struct uvc_video_device *video, int rollback)
 938 {
 939         struct uvc_entity *entity;
 940         int ret = 0;
 941
 942         /* Find the control. */
 943         ret = uvc_ctrl_commit_entity(video->dev, video->processing, rollback);
 944         if (ret < 0)
 945                 goto done;
 946
 947         list_for_each_entry(entity, &video->iterms, chain) {
 948                 ret = uvc_ctrl_commit_entity(video->dev, entity, rollback);
 949                 if (ret < 0)
 950                         goto done;
 951         }
 952
 953         list_for_each_entry(entity, &video->extensions, chain) {
 954                 ret = uvc_ctrl_commit_entity(video->dev, entity, rollback);
 955                 if (ret < 0)
 956                         goto done;
 957         }
 958
 959 done:
 960         mutex_unlock(&video->ctrl_mutex);
 961         return ret;
 962 }
 963
 964 int uvc_ctrl_get(struct uvc_video_device *video,
 965         struct v4l2_ext_control *xctrl)
 966 {
 967         struct uvc_control *ctrl;
 968         struct uvc_control_mapping *mapping;
 969         struct uvc_menu_info *menu;
 970         unsigned int i;
 971         int ret;
 972
 973         ctrl = uvc_find_control(video, xctrl->id, &mapping);
 974         if (ctrl == NULL || (ctrl->info->flags & UVC_CONTROL_GET_CUR) == 0)
 975                 return -EINVAL;
 976
 977         if (!ctrl->loaded) {
 978                 ret = uvc_query_ctrl(video->dev, GET_CUR, ctrl->entity->id,
 979                                 video->dev->intfnum, ctrl->info->selector,
 980                                 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
 981                                 ctrl->info->size);
 982                 if (ret < 0)
 983                         return ret;
 984
 985                 ctrl->loaded = 1;
 986         }
 987
 988         xctrl->value = mapping->get(mapping, GET_CUR,
 989                 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT));
 990
 991         if (mapping->v4l2_type == V4L2_CTRL_TYPE_MENU) {
 992                 menu = mapping->menu_info;
 993                 for (i = 0; i < mapping->menu_count; ++i, ++menu) {
 994                         if (menu->value == xctrl->value) {
 995                                 xctrl->value = i;
 996                                 break;
 997                         }
 998                 }
 999         }
1000
1001         return 0;
1002 }
1003
1004 int uvc_ctrl_set(struct uvc_video_device *video,
1005         struct v4l2_ext_control *xctrl)
1006 {
1007         struct uvc_control *ctrl;
1008         struct uvc_control_mapping *mapping;
1009         s32 value = xctrl->value;
1010         int ret;
1011
1012         ctrl = uvc_find_control(video, xctrl->id, &mapping);
1013         if (ctrl == NULL || (ctrl->info->flags & UVC_CONTROL_SET_CUR) == 0)
1014                 return -EINVAL;
1015
1016         if (mapping->v4l2_type == V4L2_CTRL_TYPE_MENU) {
1017                 if (value < 0 || value >= mapping->menu_count)
1018                         return -EINVAL;
1019                 value = mapping->menu_info[value].value;
1020         }
1021
1022         if (!ctrl->loaded && (ctrl->info->size * 8) != mapping->size) {
1023                 if ((ctrl->info->flags & UVC_CONTROL_GET_CUR) == 0) {
1024                         memset(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1025                                 0, ctrl->info->size);
1026                 } else {
1027                         ret = uvc_query_ctrl(video->dev, GET_CUR,
1028                                 ctrl->entity->id, video->dev->intfnum,
1029                                 ctrl->info->selector,
1030                                 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1031                                 ctrl->info->size);
1032                         if (ret < 0)
1033                                 return ret;
1034                 }
1035
1036                 ctrl->loaded = 1;
1037         }
1038
1039         if (!ctrl->dirty) {
1040                 memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
1041                        uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1042                        ctrl->info->size);
1043         }
1044
1045         mapping->set(mapping, value,
1046                 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT));
1047
1048         ctrl->dirty = 1;
1049         ctrl->modified = 1;
1050         return 0;
1051 }
1052
1053 /* --------------------------------------------------------------------------
1054  * Dynamic controls
1055  */
1056
1057 int uvc_xu_ctrl_query(struct uvc_video_device *video,
1058         struct uvc_xu_control *xctrl, int set)
1059 {
1060         struct uvc_entity *entity;
1061         struct uvc_control *ctrl = NULL;
1062         unsigned int i, found = 0;
1063         __u8 *data;
1064         int ret;
1065
1066         /* Find the extension unit. */
1067         list_for_each_entry(entity, &video->extensions, chain) {
1068                 if (entity->id == xctrl->unit)
1069                         break;
1070         }
1071
1072         if (entity->id != xctrl->unit) {
1073                 uvc_trace(UVC_TRACE_CONTROL, "Extension unit %u not found.\n",
1074                         xctrl->unit);
1075                 return -EINVAL;
1076         }
1077
1078         /* Find the control. */
1079         for (i = 0; i < entity->ncontrols; ++i) {
1080                 ctrl = &entity->controls[i];
1081                 if (ctrl->info == NULL)
1082                         continue;
1083
1084                 if (ctrl->info->selector == xctrl->selector) {
1085                         found = 1;
1086                         break;
1087                 }
1088         }
1089
1090         if (!found) {
1091                 uvc_trace(UVC_TRACE_CONTROL,
1092                         "Control " UVC_GUID_FORMAT "/%u not found.\n",
1093                         UVC_GUID_ARGS(entity->extension.guidExtensionCode),
1094                         xctrl->selector);
1095                 return -EINVAL;
1096         }
1097
1098         /* Validate control data size. */
1099         if (ctrl->info->size != xctrl->size)
1100                 return -EINVAL;
1101
1102         if ((set && !(ctrl->info->flags & UVC_CONTROL_SET_CUR)) ||
1103             (!set && !(ctrl->info->flags & UVC_CONTROL_GET_CUR)))
1104                 return -EINVAL;
1105
1106         if (mutex_lock_interruptible(&video->ctrl_mutex))
1107                 return -ERESTARTSYS;
1108
1109         memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
1110                uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1111                xctrl->size);
1112         data = uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT);
1113
1114         if (set && copy_from_user(data, xctrl->data, xctrl->size)) {
1115                 ret = -EFAULT;
1116                 goto out;
1117         }
1118
1119         ret = uvc_query_ctrl(video->dev, set ? SET_CUR : GET_CUR, xctrl->unit,
1120                              video->dev->intfnum, xctrl->selector, data,
1121                              xctrl->size);
1122         if (ret < 0)
1123                 goto out;
1124
1125         if (!set && copy_to_user(xctrl->data, data, xctrl->size)) {
1126                 ret = -EFAULT;
1127                 goto out;
1128         }
1129
1130 out:
1131         if (ret)
1132                 memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1133                        uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
1134                        xctrl->size);
1135
1136         mutex_unlock(&video->ctrl_mutex);
1137         return ret;
1138 }
1139
1140 /* --------------------------------------------------------------------------
1141  * Suspend/resume
1142  */
1143
1144 /*
1145  * Restore control values after resume, skipping controls that haven't been
1146  * changed.
1147  *
1148  * TODO
1149  * - Don't restore modified controls that are back to their default value.
1150  * - Handle restore order (Auto-Exposure Mode should be restored before
1151  *   Exposure Time).
1152  */
1153 int uvc_ctrl_resume_device(struct uvc_device *dev)
1154 {
1155         struct uvc_control *ctrl;
1156         struct uvc_entity *entity;
1157         unsigned int i;
1158         int ret;
1159
1160         /* Walk the entities list and restore controls when possible. */
1161         list_for_each_entry(entity, &dev->entities, list) {
1162
1163                 for (i = 0; i < entity->ncontrols; ++i) {
1164                         ctrl = &entity->controls[i];
1165
1166                         if (ctrl->info == NULL || !ctrl->modified ||
1167                             (ctrl->info->flags & UVC_CONTROL_RESTORE) == 0)
1168                                 continue;
1169
1170                         printk(KERN_INFO "restoring control " UVC_GUID_FORMAT
1171                                 "/%u/%u\n", UVC_GUID_ARGS(ctrl->info->entity),
1172                                 ctrl->info->index, ctrl->info->selector);
1173                         ctrl->dirty = 1;
1174                 }
1175
1176                 ret = uvc_ctrl_commit_entity(dev, entity, 0);
1177                 if (ret < 0)
1178                         return ret;
1179         }
1180
1181         return 0;
1182 }
1183
1184 /* --------------------------------------------------------------------------
1185  * Control and mapping handling
1186  */
1187
1188 static void uvc_ctrl_add_ctrl(struct uvc_device *dev,
1189         struct uvc_control_info *info)
1190 {
1191         struct uvc_entity *entity;
1192         struct uvc_control *ctrl = NULL;
1193         int ret, found = 0;
1194         unsigned int i;
1195
1196         list_for_each_entry(entity, &dev->entities, list) {
1197                 if (!uvc_entity_match_guid(entity, info->entity))
1198                         continue;
1199
1200                 for (i = 0; i < entity->ncontrols; ++i) {
1201                         ctrl = &entity->controls[i];
1202                         if (ctrl->index == info->index) {
1203                                 found = 1;
1204                                 break;
1205                         }
1206                 }
1207
1208                 if (found)
1209                         break;
1210         }
1211
1212         if (!found)
1213                 return;
1214
1215         if (UVC_ENTITY_TYPE(entity) == VC_EXTENSION_UNIT) {
1216                 /* Check if the device control information and length match
1217                  * the user supplied information.
1218                  */
1219                 __u32 flags;
1220                 __le16 size;
1221                 __u8 inf;
1222
1223                 if ((ret = uvc_query_ctrl(dev, GET_LEN, ctrl->entity->id,
1224                         dev->intfnum, info->selector, (__u8 *)&size, 2)) < 0) {
1225                         uvc_trace(UVC_TRACE_CONTROL, "GET_LEN failed on "
1226                                 "control " UVC_GUID_FORMAT "/%u (%d).\n",
1227                                 UVC_GUID_ARGS(info->entity), info->selector,
1228                                 ret);
1229                         return;
1230                 }
1231
1232                 if (info->size != le16_to_cpu(size)) {
1233                         uvc_trace(UVC_TRACE_CONTROL, "Control " UVC_GUID_FORMAT
1234                                 "/%u size doesn't match user supplied "
1235                                 "value.\n", UVC_GUID_ARGS(info->entity),
1236                                 info->selector);
1237                         return;
1238                 }
1239
1240                 if ((ret = uvc_query_ctrl(dev, GET_INFO, ctrl->entity->id,
1241                         dev->intfnum, info->selector, &inf, 1)) < 0) {
1242                         uvc_trace(UVC_TRACE_CONTROL, "GET_INFO failed on "
1243                                 "control " UVC_GUID_FORMAT "/%u (%d).\n",
1244                                 UVC_GUID_ARGS(info->entity), info->selector,
1245                                 ret);
1246                         return;
1247                 }
1248
1249                 flags = info->flags;
1250                 if (((flags & UVC_CONTROL_GET_CUR) && !(inf & (1 << 0))) ||
1251                     ((flags & UVC_CONTROL_SET_CUR) && !(inf & (1 << 1)))) {
1252                         uvc_trace(UVC_TRACE_CONTROL, "Control "
1253                                 UVC_GUID_FORMAT "/%u flags don't match "
1254                                 "supported operations.\n",
1255                                 UVC_GUID_ARGS(info->entity), info->selector);
1256                         return;
1257                 }
1258         }
1259
1260         ctrl->info = info;
1261         ctrl->data = kmalloc(ctrl->info->size * UVC_CTRL_NDATA, GFP_KERNEL);
1262         uvc_trace(UVC_TRACE_CONTROL, "Added control " UVC_GUID_FORMAT "/%u "
1263                 "to device %s entity %u\n", UVC_GUID_ARGS(ctrl->info->entity),
1264                 ctrl->info->selector, dev->udev->devpath, entity->id);
1265 }
1266
1267 /*
1268  * Add an item to the UVC control information list, and instantiate a control
1269  * structure for each device that supports the control.
1270  */
1271 int uvc_ctrl_add_info(struct uvc_control_info *info)
1272 {
1273         struct uvc_control_info *ctrl;
1274         struct uvc_device *dev;
1275         int ret = 0;
1276
1277         /* Find matching controls by walking the devices, entities and
1278          * controls list.
1279          */
1280         mutex_lock(&uvc_driver.ctrl_mutex);
1281
1282         /* First check if the list contains a control matching the new one.
1283          * Bail out if it does.
1284          */
1285         list_for_each_entry(ctrl, &uvc_driver.controls, list) {
1286                 if (memcmp(ctrl->entity, info->entity, 16))
1287                         continue;
1288
1289                 if (ctrl->selector == info->selector) {
1290                         uvc_trace(UVC_TRACE_CONTROL, "Control "
1291                                 UVC_GUID_FORMAT "/%u is already defined.\n",
1292                                 UVC_GUID_ARGS(info->entity), info->selector);
1293                         ret = -EEXIST;
1294                         goto end;
1295                 }
1296                 if (ctrl->index == info->index) {
1297                         uvc_trace(UVC_TRACE_CONTROL, "Control "
1298                                 UVC_GUID_FORMAT "/%u would overwrite index "
1299                                 "%d.\n", UVC_GUID_ARGS(info->entity),
1300                                 info->selector, info->index);
1301                         ret = -EEXIST;
1302                         goto end;
1303                 }
1304         }
1305
1306         list_for_each_entry(dev, &uvc_driver.devices, list)
1307                 uvc_ctrl_add_ctrl(dev, info);
1308
1309         INIT_LIST_HEAD(&info->mappings);
1310         list_add_tail(&info->list, &uvc_driver.controls);
1311 end:
1312         mutex_unlock(&uvc_driver.ctrl_mutex);
1313         return ret;
1314 }
1315
1316 int uvc_ctrl_add_mapping(struct uvc_control_mapping *mapping)
1317 {
1318         struct uvc_control_info *info;
1319         struct uvc_control_mapping *map;
1320         int ret = -EINVAL;
1321
1322         if (mapping->get == NULL)
1323                 mapping->get = uvc_get_le_value;
1324         if (mapping->set == NULL)
1325                 mapping->set = uvc_set_le_value;
1326
1327         if (mapping->id & ~V4L2_CTRL_ID_MASK) {
1328                 uvc_trace(UVC_TRACE_CONTROL, "Can't add mapping '%s' with "
1329                         "invalid control id 0x%08x\n", mapping->name,
1330                         mapping->id);
1331                 return -EINVAL;
1332         }
1333
1334         mutex_lock(&uvc_driver.ctrl_mutex);
1335         list_for_each_entry(info, &uvc_driver.controls, list) {
1336                 if (memcmp(info->entity, mapping->entity, 16) ||
1337                         info->selector != mapping->selector)
1338                         continue;
1339
1340                 if (info->size * 8 < mapping->size + mapping->offset) {
1341                         uvc_trace(UVC_TRACE_CONTROL, "Mapping '%s' would "
1342                                 "overflow control " UVC_GUID_FORMAT "/%u\n",
1343                                 mapping->name, UVC_GUID_ARGS(info->entity),
1344                                 info->selector);
1345                         ret = -EOVERFLOW;
1346                         goto end;
1347                 }
1348
1349                 /* Check if the list contains a mapping matching the new one.
1350                  * Bail out if it does.
1351                  */
1352                 list_for_each_entry(map, &info->mappings, list) {
1353                         if (map->id == mapping->id) {
1354                                 uvc_trace(UVC_TRACE_CONTROL, "Mapping '%s' is "
1355                                         "already defined.\n", mapping->name);
1356                                 ret = -EEXIST;
1357                                 goto end;
1358                         }
1359                 }
1360
1361                 mapping->ctrl = info;
1362                 list_add_tail(&mapping->list, &info->mappings);
1363                 uvc_trace(UVC_TRACE_CONTROL, "Adding mapping %s to control "
1364                         UVC_GUID_FORMAT "/%u.\n", mapping->name,
1365                         UVC_GUID_ARGS(info->entity), info->selector);
1366
1367                 ret = 0;
1368                 break;
1369         }
1370 end:
1371         mutex_unlock(&uvc_driver.ctrl_mutex);
1372         return ret;
1373 }
1374
1375 /*
1376  * Prune an entity of its bogus controls. This currently includes processing
1377  * unit auto controls for which no corresponding manual control is available.
1378  * Such auto controls make little sense if any, and are known to crash at
1379  * least the SiGma Micro webcam.
1380  */
1381 static void
1382 uvc_ctrl_prune_entity(struct uvc_entity *entity)
1383 {
1384         static const struct {
1385                 u8 idx_manual;
1386                 u8 idx_auto;
1387         } blacklist[] = {
1388                 { 2, 11 }, /* Hue */
1389                 { 6, 12 }, /* White Balance Temperature */
1390                 { 7, 13 }, /* White Balance Component */
1391         };
1392
1393         u8 *controls;
1394         unsigned int size;
1395         unsigned int i;
1396
1397         if (UVC_ENTITY_TYPE(entity) != VC_PROCESSING_UNIT)
1398                 return;
1399
1400         controls = entity->processing.bmControls;
1401         size = entity->processing.bControlSize;
1402
1403         for (i = 0; i < ARRAY_SIZE(blacklist); ++i) {
1404                 if (blacklist[i].idx_auto >= 8 * size ||
1405                     blacklist[i].idx_manual >= 8 * size)
1406                         continue;
1407
1408                 if (!uvc_test_bit(controls, blacklist[i].idx_auto) ||
1409                      uvc_test_bit(controls, blacklist[i].idx_manual))
1410                         continue;
1411
1412                 uvc_trace(UVC_TRACE_CONTROL, "Auto control %u/%u has no "
1413                         "matching manual control, removing it.\n", entity->id,
1414                         blacklist[i].idx_auto);
1415
1416                 uvc_clear_bit(controls, blacklist[i].idx_auto);
1417         }
1418 }
1419
1420 /*
1421  * Initialize device controls.
1422  */
1423 int uvc_ctrl_init_device(struct uvc_device *dev)
1424 {
1425         struct uvc_control_info *info;
1426         struct uvc_control *ctrl;
1427         struct uvc_entity *entity;
1428         unsigned int i;
1429
1430         /* Walk the entities list and instantiate controls */
1431         list_for_each_entry(entity, &dev->entities, list) {
1432                 unsigned int bControlSize = 0, ncontrols = 0;
1433                 __u8 *bmControls = NULL;
1434
1435                 if (UVC_ENTITY_TYPE(entity) == VC_EXTENSION_UNIT) {
1436                         bmControls = entity->extension.bmControls;
1437                         bControlSize = entity->extension.bControlSize;
1438                 } else if (UVC_ENTITY_TYPE(entity) == VC_PROCESSING_UNIT) {
1439                         bmControls = entity->processing.bmControls;
1440                         bControlSize = entity->processing.bControlSize;
1441                 } else if (UVC_ENTITY_TYPE(entity) == ITT_CAMERA) {
1442                         bmControls = entity->camera.bmControls;
1443                         bControlSize = entity->camera.bControlSize;
1444                 }
1445
1446                 if (dev->quirks & UVC_QUIRK_PRUNE_CONTROLS)
1447                         uvc_ctrl_prune_entity(entity);
1448
1449                 for (i = 0; i < bControlSize; ++i)
1450                         ncontrols += hweight8(bmControls[i]);
1451
1452                 if (ncontrols == 0)
1453                         continue;
1454
1455                 entity->controls = kzalloc(ncontrols*sizeof *ctrl, GFP_KERNEL);
1456                 if (entity->controls == NULL)
1457                         return -ENOMEM;
1458
1459                 entity->ncontrols = ncontrols;
1460
1461                 ctrl = entity->controls;
1462                 for (i = 0; i < bControlSize * 8; ++i) {
1463                         if (uvc_test_bit(bmControls, i) == 0)
1464                                 continue;
1465
1466                         ctrl->entity = entity;
1467                         ctrl->index = i;
1468                         ctrl++;
1469                 }
1470         }
1471
1472         /* Walk the controls info list and associate them with the device
1473          * controls, then add the device to the global device list. This has
1474          * to be done while holding the controls lock, to make sure
1475          * uvc_ctrl_add_info() will not get called in-between.
1476          */
1477         mutex_lock(&uvc_driver.ctrl_mutex);
1478         list_for_each_entry(info, &uvc_driver.controls, list)
1479                 uvc_ctrl_add_ctrl(dev, info);
1480
1481         list_add_tail(&dev->list, &uvc_driver.devices);
1482         mutex_unlock(&uvc_driver.ctrl_mutex);
1483
1484         return 0;
1485 }
1486
1487 /*
1488  * Cleanup device controls.
1489  */
1490 void uvc_ctrl_cleanup_device(struct uvc_device *dev)
1491 {
1492         struct uvc_entity *entity;
1493         unsigned int i;
1494
1495         /* Remove the device from the global devices list */
1496         mutex_lock(&uvc_driver.ctrl_mutex);
1497         if (dev->list.next != NULL)
1498                 list_del(&dev->list);
1499         mutex_unlock(&uvc_driver.ctrl_mutex);
1500
1501         list_for_each_entry(entity, &dev->entities, list) {
1502                 for (i = 0; i < entity->ncontrols; ++i)
1503                         kfree(entity->controls[i].data);
1504
1505                 kfree(entity->controls);
1506         }
1507 }
1508
1509 void uvc_ctrl_init(void)
1510 {
1511         struct uvc_control_info *ctrl = uvc_ctrls;
1512         struct uvc_control_info *cend = ctrl + ARRAY_SIZE(uvc_ctrls);
1513         struct uvc_control_mapping *mapping = uvc_ctrl_mappings;
1514         struct uvc_control_mapping *mend =
1515                 mapping + ARRAY_SIZE(uvc_ctrl_mappings);
1516
1517         for (; ctrl < cend; ++ctrl)
1518                 uvc_ctrl_add_info(ctrl);
1519
1520         for (; mapping < mend; ++mapping)
1521                 uvc_ctrl_add_mapping(mapping);
1522 }
1523