drivers/media/video/uvc/uvc_ctrl.c

   1 /*
   2  *      uvc_ctrl.c  --  USB Video Class driver - Controls
   3  *
   4  *      Copyright (C) 2005-2010
   5  *          Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   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/list.h>
  16 #include <linux/module.h>
  17 #include <linux/slab.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_DATA_CURRENT   0
  28 #define UVC_CTRL_DATA_BACKUP    1
  29 #define UVC_CTRL_DATA_MIN       2
  30 #define UVC_CTRL_DATA_MAX       3
  31 #define UVC_CTRL_DATA_RES       4
  32 #define UVC_CTRL_DATA_DEF       5
  33 #define UVC_CTRL_DATA_LAST      6
  34
  35 /* ------------------------------------------------------------------------
  36  * Controls
  37  */
  38
  39 static struct uvc_control_info uvc_ctrls[] = {
  40         {
  41                 .entity         = UVC_GUID_UVC_PROCESSING,
  42                 .selector       = UVC_PU_BRIGHTNESS_CONTROL,
  43                 .index          = 0,
  44                 .size           = 2,
  45                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
  46                                 | UVC_CONTROL_RESTORE,
  47         },
  48         {
  49                 .entity         = UVC_GUID_UVC_PROCESSING,
  50                 .selector       = UVC_PU_CONTRAST_CONTROL,
  51                 .index          = 1,
  52                 .size           = 2,
  53                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
  54                                 | UVC_CONTROL_RESTORE,
  55         },
  56         {
  57                 .entity         = UVC_GUID_UVC_PROCESSING,
  58                 .selector       = UVC_PU_HUE_CONTROL,
  59                 .index          = 2,
  60                 .size           = 2,
  61                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
  62                                 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
  63         },
  64         {
  65                 .entity         = UVC_GUID_UVC_PROCESSING,
  66                 .selector       = UVC_PU_SATURATION_CONTROL,
  67                 .index          = 3,
  68                 .size           = 2,
  69                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
  70                                 | UVC_CONTROL_RESTORE,
  71         },
  72         {
  73                 .entity         = UVC_GUID_UVC_PROCESSING,
  74                 .selector       = UVC_PU_SHARPNESS_CONTROL,
  75                 .index          = 4,
  76                 .size           = 2,
  77                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
  78                                 | UVC_CONTROL_RESTORE,
  79         },
  80         {
  81                 .entity         = UVC_GUID_UVC_PROCESSING,
  82                 .selector       = UVC_PU_GAMMA_CONTROL,
  83                 .index          = 5,
  84                 .size           = 2,
  85                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
  86                                 | UVC_CONTROL_RESTORE,
  87         },
  88         {
  89                 .entity         = UVC_GUID_UVC_PROCESSING,
  90                 .selector       = UVC_PU_WHITE_BALANCE_TEMPERATURE_CONTROL,
  91                 .index          = 6,
  92                 .size           = 2,
  93                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
  94                                 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
  95         },
  96         {
  97                 .entity         = UVC_GUID_UVC_PROCESSING,
  98                 .selector       = UVC_PU_WHITE_BALANCE_COMPONENT_CONTROL,
  99                 .index          = 7,
 100                 .size           = 4,
 101                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 102                                 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
 103         },
 104         {
 105                 .entity         = UVC_GUID_UVC_PROCESSING,
 106                 .selector       = UVC_PU_BACKLIGHT_COMPENSATION_CONTROL,
 107                 .index          = 8,
 108                 .size           = 2,
 109                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 110                                 | UVC_CONTROL_RESTORE,
 111         },
 112         {
 113                 .entity         = UVC_GUID_UVC_PROCESSING,
 114                 .selector       = UVC_PU_GAIN_CONTROL,
 115                 .index          = 9,
 116                 .size           = 2,
 117                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 118                                 | UVC_CONTROL_RESTORE,
 119         },
 120         {
 121                 .entity         = UVC_GUID_UVC_PROCESSING,
 122                 .selector       = UVC_PU_POWER_LINE_FREQUENCY_CONTROL,
 123                 .index          = 10,
 124                 .size           = 1,
 125                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 126                                 | UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
 127         },
 128         {
 129                 .entity         = UVC_GUID_UVC_PROCESSING,
 130                 .selector       = UVC_PU_HUE_AUTO_CONTROL,
 131                 .index          = 11,
 132                 .size           = 1,
 133                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 134                                 | UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
 135         },
 136         {
 137                 .entity         = UVC_GUID_UVC_PROCESSING,
 138                 .selector       = UVC_PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL,
 139                 .index          = 12,
 140                 .size           = 1,
 141                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 142                                 | UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
 143         },
 144         {
 145                 .entity         = UVC_GUID_UVC_PROCESSING,
 146                 .selector       = UVC_PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL,
 147                 .index          = 13,
 148                 .size           = 1,
 149                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 150                                 | UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
 151         },
 152         {
 153                 .entity         = UVC_GUID_UVC_PROCESSING,
 154                 .selector       = UVC_PU_DIGITAL_MULTIPLIER_CONTROL,
 155                 .index          = 14,
 156                 .size           = 2,
 157                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 158                                 | UVC_CONTROL_RESTORE,
 159         },
 160         {
 161                 .entity         = UVC_GUID_UVC_PROCESSING,
 162                 .selector       = UVC_PU_DIGITAL_MULTIPLIER_LIMIT_CONTROL,
 163                 .index          = 15,
 164                 .size           = 2,
 165                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 166                                 | UVC_CONTROL_RESTORE,
 167         },
 168         {
 169                 .entity         = UVC_GUID_UVC_PROCESSING,
 170                 .selector       = UVC_PU_ANALOG_VIDEO_STANDARD_CONTROL,
 171                 .index          = 16,
 172                 .size           = 1,
 173                 .flags          = UVC_CONTROL_GET_CUR,
 174         },
 175         {
 176                 .entity         = UVC_GUID_UVC_PROCESSING,
 177                 .selector       = UVC_PU_ANALOG_LOCK_STATUS_CONTROL,
 178                 .index          = 17,
 179                 .size           = 1,
 180                 .flags          = UVC_CONTROL_GET_CUR,
 181         },
 182         {
 183                 .entity         = UVC_GUID_UVC_CAMERA,
 184                 .selector       = UVC_CT_SCANNING_MODE_CONTROL,
 185                 .index          = 0,
 186                 .size           = 1,
 187                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 188                                 | UVC_CONTROL_RESTORE,
 189         },
 190         {
 191                 .entity         = UVC_GUID_UVC_CAMERA,
 192                 .selector       = UVC_CT_AE_MODE_CONTROL,
 193                 .index          = 1,
 194                 .size           = 1,
 195                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 196                                 | UVC_CONTROL_GET_DEF | UVC_CONTROL_GET_RES
 197                                 | UVC_CONTROL_RESTORE,
 198         },
 199         {
 200                 .entity         = UVC_GUID_UVC_CAMERA,
 201                 .selector       = UVC_CT_AE_PRIORITY_CONTROL,
 202                 .index          = 2,
 203                 .size           = 1,
 204                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 205                                 | UVC_CONTROL_RESTORE,
 206         },
 207         {
 208                 .entity         = UVC_GUID_UVC_CAMERA,
 209                 .selector       = UVC_CT_EXPOSURE_TIME_ABSOLUTE_CONTROL,
 210                 .index          = 3,
 211                 .size           = 4,
 212                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 213                                 | UVC_CONTROL_RESTORE,
 214         },
 215         {
 216                 .entity         = UVC_GUID_UVC_CAMERA,
 217                 .selector       = UVC_CT_EXPOSURE_TIME_RELATIVE_CONTROL,
 218                 .index          = 4,
 219                 .size           = 1,
 220                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_RESTORE,
 221         },
 222         {
 223                 .entity         = UVC_GUID_UVC_CAMERA,
 224                 .selector       = UVC_CT_FOCUS_ABSOLUTE_CONTROL,
 225                 .index          = 5,
 226                 .size           = 2,
 227                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 228                                 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
 229         },
 230         {
 231                 .entity         = UVC_GUID_UVC_CAMERA,
 232                 .selector       = UVC_CT_FOCUS_RELATIVE_CONTROL,
 233                 .index          = 6,
 234                 .size           = 2,
 235                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_MIN
 236                                 | UVC_CONTROL_GET_MAX | UVC_CONTROL_GET_RES
 237                                 | UVC_CONTROL_GET_DEF | UVC_CONTROL_AUTO_UPDATE,
 238         },
 239         {
 240                 .entity         = UVC_GUID_UVC_CAMERA,
 241                 .selector       = UVC_CT_IRIS_ABSOLUTE_CONTROL,
 242                 .index          = 7,
 243                 .size           = 2,
 244                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 245                                 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
 246         },
 247         {
 248                 .entity         = UVC_GUID_UVC_CAMERA,
 249                 .selector       = UVC_CT_IRIS_RELATIVE_CONTROL,
 250                 .index          = 8,
 251                 .size           = 1,
 252                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_AUTO_UPDATE,
 253         },
 254         {
 255                 .entity         = UVC_GUID_UVC_CAMERA,
 256                 .selector       = UVC_CT_ZOOM_ABSOLUTE_CONTROL,
 257                 .index          = 9,
 258                 .size           = 2,
 259                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 260                                 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
 261         },
 262         {
 263                 .entity         = UVC_GUID_UVC_CAMERA,
 264                 .selector       = UVC_CT_ZOOM_RELATIVE_CONTROL,
 265                 .index          = 10,
 266                 .size           = 3,
 267                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_MIN
 268                                 | UVC_CONTROL_GET_MAX | UVC_CONTROL_GET_RES
 269                                 | UVC_CONTROL_GET_DEF | UVC_CONTROL_AUTO_UPDATE,
 270         },
 271         {
 272                 .entity         = UVC_GUID_UVC_CAMERA,
 273                 .selector       = UVC_CT_PANTILT_ABSOLUTE_CONTROL,
 274                 .index          = 11,
 275                 .size           = 8,
 276                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 277                                 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
 278         },
 279         {
 280                 .entity         = UVC_GUID_UVC_CAMERA,
 281                 .selector       = UVC_CT_PANTILT_RELATIVE_CONTROL,
 282                 .index          = 12,
 283                 .size           = 4,
 284                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_MIN
 285                                 | UVC_CONTROL_GET_MAX | UVC_CONTROL_GET_RES
 286                                 | UVC_CONTROL_GET_DEF | UVC_CONTROL_AUTO_UPDATE,
 287         },
 288         {
 289                 .entity         = UVC_GUID_UVC_CAMERA,
 290                 .selector       = UVC_CT_ROLL_ABSOLUTE_CONTROL,
 291                 .index          = 13,
 292                 .size           = 2,
 293                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 294                                 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
 295         },
 296         {
 297                 .entity         = UVC_GUID_UVC_CAMERA,
 298                 .selector       = UVC_CT_ROLL_RELATIVE_CONTROL,
 299                 .index          = 14,
 300                 .size           = 2,
 301                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_MIN
 302                                 | UVC_CONTROL_GET_MAX | UVC_CONTROL_GET_RES
 303                                 | UVC_CONTROL_GET_DEF | UVC_CONTROL_AUTO_UPDATE,
 304         },
 305         {
 306                 .entity         = UVC_GUID_UVC_CAMERA,
 307                 .selector       = UVC_CT_FOCUS_AUTO_CONTROL,
 308                 .index          = 17,
 309                 .size           = 1,
 310                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 311                                 | UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
 312         },
 313         {
 314                 .entity         = UVC_GUID_UVC_CAMERA,
 315                 .selector       = UVC_CT_PRIVACY_CONTROL,
 316                 .index          = 18,
 317                 .size           = 1,
 318                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 319                                 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
 320         },
 321 };
 322
 323 static struct uvc_menu_info power_line_frequency_controls[] = {
 324         { 0, "Disabled" },
 325         { 1, "50 Hz" },
 326         { 2, "60 Hz" },
 327 };
 328
 329 static struct uvc_menu_info exposure_auto_controls[] = {
 330         { 2, "Auto Mode" },
 331         { 1, "Manual Mode" },
 332         { 4, "Shutter Priority Mode" },
 333         { 8, "Aperture Priority Mode" },
 334 };
 335
 336 static __s32 uvc_ctrl_get_zoom(struct uvc_control_mapping *mapping,
 337         __u8 query, const __u8 *data)
 338 {
 339         __s8 zoom = (__s8)data[0];
 340
 341         switch (query) {
 342         case UVC_GET_CUR:
 343                 return (zoom == 0) ? 0 : (zoom > 0 ? data[2] : -data[2]);
 344
 345         case UVC_GET_MIN:
 346         case UVC_GET_MAX:
 347         case UVC_GET_RES:
 348         case UVC_GET_DEF:
 349         default:
 350                 return data[2];
 351         }
 352 }
 353
 354 static void uvc_ctrl_set_zoom(struct uvc_control_mapping *mapping,
 355         __s32 value, __u8 *data)
 356 {
 357         data[0] = value == 0 ? 0 : (value > 0) ? 1 : 0xff;
 358         data[2] = min((int)abs(value), 0xff);
 359 }
 360
 361 static struct uvc_control_mapping uvc_ctrl_mappings[] = {
 362         {
 363                 .id             = V4L2_CID_BRIGHTNESS,
 364                 .name           = "Brightness",
 365                 .entity         = UVC_GUID_UVC_PROCESSING,
 366                 .selector       = UVC_PU_BRIGHTNESS_CONTROL,
 367                 .size           = 16,
 368                 .offset         = 0,
 369                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 370                 .data_type      = UVC_CTRL_DATA_TYPE_SIGNED,
 371         },
 372         {
 373                 .id             = V4L2_CID_CONTRAST,
 374                 .name           = "Contrast",
 375                 .entity         = UVC_GUID_UVC_PROCESSING,
 376                 .selector       = UVC_PU_CONTRAST_CONTROL,
 377                 .size           = 16,
 378                 .offset         = 0,
 379                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 380                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 381         },
 382         {
 383                 .id             = V4L2_CID_HUE,
 384                 .name           = "Hue",
 385                 .entity         = UVC_GUID_UVC_PROCESSING,
 386                 .selector       = UVC_PU_HUE_CONTROL,
 387                 .size           = 16,
 388                 .offset         = 0,
 389                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 390                 .data_type      = UVC_CTRL_DATA_TYPE_SIGNED,
 391         },
 392         {
 393                 .id             = V4L2_CID_SATURATION,
 394                 .name           = "Saturation",
 395                 .entity         = UVC_GUID_UVC_PROCESSING,
 396                 .selector       = UVC_PU_SATURATION_CONTROL,
 397                 .size           = 16,
 398                 .offset         = 0,
 399                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 400                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 401         },
 402         {
 403                 .id             = V4L2_CID_SHARPNESS,
 404                 .name           = "Sharpness",
 405                 .entity         = UVC_GUID_UVC_PROCESSING,
 406                 .selector       = UVC_PU_SHARPNESS_CONTROL,
 407                 .size           = 16,
 408                 .offset         = 0,
 409                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 410                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 411         },
 412         {
 413                 .id             = V4L2_CID_GAMMA,
 414                 .name           = "Gamma",
 415                 .entity         = UVC_GUID_UVC_PROCESSING,
 416                 .selector       = UVC_PU_GAMMA_CONTROL,
 417                 .size           = 16,
 418                 .offset         = 0,
 419                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 420                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 421         },
 422         {
 423                 .id             = V4L2_CID_BACKLIGHT_COMPENSATION,
 424                 .name           = "Backlight Compensation",
 425                 .entity         = UVC_GUID_UVC_PROCESSING,
 426                 .selector       = UVC_PU_BACKLIGHT_COMPENSATION_CONTROL,
 427                 .size           = 16,
 428                 .offset         = 0,
 429                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 430                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 431         },
 432         {
 433                 .id             = V4L2_CID_GAIN,
 434                 .name           = "Gain",
 435                 .entity         = UVC_GUID_UVC_PROCESSING,
 436                 .selector       = UVC_PU_GAIN_CONTROL,
 437                 .size           = 16,
 438                 .offset         = 0,
 439                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 440                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 441         },
 442         {
 443                 .id             = V4L2_CID_POWER_LINE_FREQUENCY,
 444                 .name           = "Power Line Frequency",
 445                 .entity         = UVC_GUID_UVC_PROCESSING,
 446                 .selector       = UVC_PU_POWER_LINE_FREQUENCY_CONTROL,
 447                 .size           = 2,
 448                 .offset         = 0,
 449                 .v4l2_type      = V4L2_CTRL_TYPE_MENU,
 450                 .data_type      = UVC_CTRL_DATA_TYPE_ENUM,
 451                 .menu_info      = power_line_frequency_controls,
 452                 .menu_count     = ARRAY_SIZE(power_line_frequency_controls),
 453         },
 454         {
 455                 .id             = V4L2_CID_HUE_AUTO,
 456                 .name           = "Hue, Auto",
 457                 .entity         = UVC_GUID_UVC_PROCESSING,
 458                 .selector       = UVC_PU_HUE_AUTO_CONTROL,
 459                 .size           = 1,
 460                 .offset         = 0,
 461                 .v4l2_type      = V4L2_CTRL_TYPE_BOOLEAN,
 462                 .data_type      = UVC_CTRL_DATA_TYPE_BOOLEAN,
 463         },
 464         {
 465                 .id             = V4L2_CID_EXPOSURE_AUTO,
 466                 .name           = "Exposure, Auto",
 467                 .entity         = UVC_GUID_UVC_CAMERA,
 468                 .selector       = UVC_CT_AE_MODE_CONTROL,
 469                 .size           = 4,
 470                 .offset         = 0,
 471                 .v4l2_type      = V4L2_CTRL_TYPE_MENU,
 472                 .data_type      = UVC_CTRL_DATA_TYPE_BITMASK,
 473                 .menu_info      = exposure_auto_controls,
 474                 .menu_count     = ARRAY_SIZE(exposure_auto_controls),
 475         },
 476         {
 477                 .id             = V4L2_CID_EXPOSURE_AUTO_PRIORITY,
 478                 .name           = "Exposure, Auto Priority",
 479                 .entity         = UVC_GUID_UVC_CAMERA,
 480                 .selector       = UVC_CT_AE_PRIORITY_CONTROL,
 481                 .size           = 1,
 482                 .offset         = 0,
 483                 .v4l2_type      = V4L2_CTRL_TYPE_BOOLEAN,
 484                 .data_type      = UVC_CTRL_DATA_TYPE_BOOLEAN,
 485         },
 486         {
 487                 .id             = V4L2_CID_EXPOSURE_ABSOLUTE,
 488                 .name           = "Exposure (Absolute)",
 489                 .entity         = UVC_GUID_UVC_CAMERA,
 490                 .selector       = UVC_CT_EXPOSURE_TIME_ABSOLUTE_CONTROL,
 491                 .size           = 32,
 492                 .offset         = 0,
 493                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 494                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 495         },
 496         {
 497                 .id             = V4L2_CID_AUTO_WHITE_BALANCE,
 498                 .name           = "White Balance Temperature, Auto",
 499                 .entity         = UVC_GUID_UVC_PROCESSING,
 500                 .selector       = UVC_PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL,
 501                 .size           = 1,
 502                 .offset         = 0,
 503                 .v4l2_type      = V4L2_CTRL_TYPE_BOOLEAN,
 504                 .data_type      = UVC_CTRL_DATA_TYPE_BOOLEAN,
 505         },
 506         {
 507                 .id             = V4L2_CID_WHITE_BALANCE_TEMPERATURE,
 508                 .name           = "White Balance Temperature",
 509                 .entity         = UVC_GUID_UVC_PROCESSING,
 510                 .selector       = UVC_PU_WHITE_BALANCE_TEMPERATURE_CONTROL,
 511                 .size           = 16,
 512                 .offset         = 0,
 513                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 514                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 515         },
 516         {
 517                 .id             = V4L2_CID_AUTO_WHITE_BALANCE,
 518                 .name           = "White Balance Component, Auto",
 519                 .entity         = UVC_GUID_UVC_PROCESSING,
 520                 .selector       = UVC_PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL,
 521                 .size           = 1,
 522                 .offset         = 0,
 523                 .v4l2_type      = V4L2_CTRL_TYPE_BOOLEAN,
 524                 .data_type      = UVC_CTRL_DATA_TYPE_BOOLEAN,
 525         },
 526         {
 527                 .id             = V4L2_CID_BLUE_BALANCE,
 528                 .name           = "White Balance Blue Component",
 529                 .entity         = UVC_GUID_UVC_PROCESSING,
 530                 .selector       = UVC_PU_WHITE_BALANCE_COMPONENT_CONTROL,
 531                 .size           = 16,
 532                 .offset         = 0,
 533                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 534                 .data_type      = UVC_CTRL_DATA_TYPE_SIGNED,
 535         },
 536         {
 537                 .id             = V4L2_CID_RED_BALANCE,
 538                 .name           = "White Balance Red Component",
 539                 .entity         = UVC_GUID_UVC_PROCESSING,
 540                 .selector       = UVC_PU_WHITE_BALANCE_COMPONENT_CONTROL,
 541                 .size           = 16,
 542                 .offset         = 16,
 543                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 544                 .data_type      = UVC_CTRL_DATA_TYPE_SIGNED,
 545         },
 546         {
 547                 .id             = V4L2_CID_FOCUS_ABSOLUTE,
 548                 .name           = "Focus (absolute)",
 549                 .entity         = UVC_GUID_UVC_CAMERA,
 550                 .selector       = UVC_CT_FOCUS_ABSOLUTE_CONTROL,
 551                 .size           = 16,
 552                 .offset         = 0,
 553                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 554                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 555         },
 556         {
 557                 .id             = V4L2_CID_FOCUS_AUTO,
 558                 .name           = "Focus, Auto",
 559                 .entity         = UVC_GUID_UVC_CAMERA,
 560                 .selector       = UVC_CT_FOCUS_AUTO_CONTROL,
 561                 .size           = 1,
 562                 .offset         = 0,
 563                 .v4l2_type      = V4L2_CTRL_TYPE_BOOLEAN,
 564                 .data_type      = UVC_CTRL_DATA_TYPE_BOOLEAN,
 565         },
 566         {
 567                 .id             = V4L2_CID_IRIS_ABSOLUTE,
 568                 .name           = "Iris, Absolute",
 569                 .entity         = UVC_GUID_UVC_CAMERA,
 570                 .selector       = UVC_CT_IRIS_ABSOLUTE_CONTROL,
 571                 .size           = 16,
 572                 .offset         = 0,
 573                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 574                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 575         },
 576         {
 577                 .id             = V4L2_CID_IRIS_RELATIVE,
 578                 .name           = "Iris, Relative",
 579                 .entity         = UVC_GUID_UVC_CAMERA,
 580                 .selector       = UVC_CT_IRIS_RELATIVE_CONTROL,
 581                 .size           = 8,
 582                 .offset         = 0,
 583                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 584                 .data_type      = UVC_CTRL_DATA_TYPE_SIGNED,
 585         },
 586         {
 587                 .id             = V4L2_CID_ZOOM_ABSOLUTE,
 588                 .name           = "Zoom, Absolute",
 589                 .entity         = UVC_GUID_UVC_CAMERA,
 590                 .selector       = UVC_CT_ZOOM_ABSOLUTE_CONTROL,
 591                 .size           = 16,
 592                 .offset         = 0,
 593                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 594                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 595         },
 596         {
 597                 .id             = V4L2_CID_ZOOM_CONTINUOUS,
 598                 .name           = "Zoom, Continuous",
 599                 .entity         = UVC_GUID_UVC_CAMERA,
 600                 .selector       = UVC_CT_ZOOM_RELATIVE_CONTROL,
 601                 .size           = 0,
 602                 .offset         = 0,
 603                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 604                 .data_type      = UVC_CTRL_DATA_TYPE_SIGNED,
 605                 .get            = uvc_ctrl_get_zoom,
 606                 .set            = uvc_ctrl_set_zoom,
 607         },
 608         {
 609                 .id             = V4L2_CID_PAN_ABSOLUTE,
 610                 .name           = "Pan (Absolute)",
 611                 .entity         = UVC_GUID_UVC_CAMERA,
 612                 .selector       = UVC_CT_PANTILT_ABSOLUTE_CONTROL,
 613                 .size           = 32,
 614                 .offset         = 0,
 615                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 616                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 617         },
 618         {
 619                 .id             = V4L2_CID_TILT_ABSOLUTE,
 620                 .name           = "Tilt (Absolute)",
 621                 .entity         = UVC_GUID_UVC_CAMERA,
 622                 .selector       = UVC_CT_PANTILT_ABSOLUTE_CONTROL,
 623                 .size           = 32,
 624                 .offset         = 32,
 625                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 626                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 627         },
 628         {
 629                 .id             = V4L2_CID_PRIVACY,
 630                 .name           = "Privacy",
 631                 .entity         = UVC_GUID_UVC_CAMERA,
 632                 .selector       = UVC_CT_PRIVACY_CONTROL,
 633                 .size           = 1,
 634                 .offset         = 0,
 635                 .v4l2_type      = V4L2_CTRL_TYPE_BOOLEAN,
 636                 .data_type      = UVC_CTRL_DATA_TYPE_BOOLEAN,
 637         },
 638 };
 639
 640 /* ------------------------------------------------------------------------
 641  * Utility functions
 642  */
 643
 644 static inline __u8 *uvc_ctrl_data(struct uvc_control *ctrl, int id)
 645 {
 646         return ctrl->uvc_data + id * ctrl->info->size;
 647 }
 648
 649 static inline int uvc_test_bit(const __u8 *data, int bit)
 650 {
 651         return (data[bit >> 3] >> (bit & 7)) & 1;
 652 }
 653
 654 static inline void uvc_clear_bit(__u8 *data, int bit)
 655 {
 656         data[bit >> 3] &= ~(1 << (bit & 7));
 657 }
 658
 659 /* Extract the bit string specified by mapping->offset and mapping->size
 660  * from the little-endian data stored at 'data' and return the result as
 661  * a signed 32bit integer. Sign extension will be performed if the mapping
 662  * references a signed data type.
 663  */
 664 static __s32 uvc_get_le_value(struct uvc_control_mapping *mapping,
 665         __u8 query, const __u8 *data)
 666 {
 667         int bits = mapping->size;
 668         int offset = mapping->offset;
 669         __s32 value = 0;
 670         __u8 mask;
 671
 672         data += offset / 8;
 673         offset &= 7;
 674         mask = ((1LL << bits) - 1) << offset;
 675
 676         for (; bits > 0; data++) {
 677                 __u8 byte = *data & mask;
 678                 value |= offset > 0 ? (byte >> offset) : (byte << (-offset));
 679                 bits -= 8 - (offset > 0 ? offset : 0);
 680                 offset -= 8;
 681                 mask = (1 << bits) - 1;
 682         }
 683
 684         /* Sign-extend the value if needed. */
 685         if (mapping->data_type == UVC_CTRL_DATA_TYPE_SIGNED)
 686                 value |= -(value & (1 << (mapping->size - 1)));
 687
 688         return value;
 689 }
 690
 691 /* Set the bit string specified by mapping->offset and mapping->size
 692  * in the little-endian data stored at 'data' to the value 'value'.
 693  */
 694 static void uvc_set_le_value(struct uvc_control_mapping *mapping,
 695         __s32 value, __u8 *data)
 696 {
 697         int bits = mapping->size;
 698         int offset = mapping->offset;
 699         __u8 mask;
 700
 701         /* According to the v4l2 spec, writing any value to a button control
 702          * should result in the action belonging to the button control being
 703          * triggered. UVC devices however want to see a 1 written -> override
 704          * value.
 705          */
 706         if (mapping->v4l2_type == V4L2_CTRL_TYPE_BUTTON)
 707                 value = -1;
 708
 709         data += offset / 8;
 710         offset &= 7;
 711
 712         for (; bits > 0; data++) {
 713                 mask = ((1LL << bits) - 1) << offset;
 714                 *data = (*data & ~mask) | ((value << offset) & mask);
 715                 value >>= offset ? offset : 8;
 716                 bits -= 8 - offset;
 717                 offset = 0;
 718         }
 719 }
 720
 721 /* ------------------------------------------------------------------------
 722  * Terminal and unit management
 723  */
 724
 725 static const __u8 uvc_processing_guid[16] = UVC_GUID_UVC_PROCESSING;
 726 static const __u8 uvc_camera_guid[16] = UVC_GUID_UVC_CAMERA;
 727 static const __u8 uvc_media_transport_input_guid[16] =
 728         UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT;
 729
 730 static int uvc_entity_match_guid(const struct uvc_entity *entity,
 731         const __u8 guid[16])
 732 {
 733         switch (UVC_ENTITY_TYPE(entity)) {
 734         case UVC_ITT_CAMERA:
 735                 return memcmp(uvc_camera_guid, guid, 16) == 0;
 736
 737         case UVC_ITT_MEDIA_TRANSPORT_INPUT:
 738                 return memcmp(uvc_media_transport_input_guid, guid, 16) == 0;
 739
 740         case UVC_VC_PROCESSING_UNIT:
 741                 return memcmp(uvc_processing_guid, guid, 16) == 0;
 742
 743         case UVC_VC_EXTENSION_UNIT:
 744                 return memcmp(entity->extension.guidExtensionCode,
 745                               guid, 16) == 0;
 746
 747         default:
 748                 return 0;
 749         }
 750 }
 751
 752 /* ------------------------------------------------------------------------
 753  * UVC Controls
 754  */
 755
 756 static void __uvc_find_control(struct uvc_entity *entity, __u32 v4l2_id,
 757         struct uvc_control_mapping **mapping, struct uvc_control **control,
 758         int next)
 759 {
 760         struct uvc_control *ctrl;
 761         struct uvc_control_mapping *map;
 762         unsigned int i;
 763
 764         if (entity == NULL)
 765                 return;
 766
 767         for (i = 0; i < entity->ncontrols; ++i) {
 768                 ctrl = &entity->controls[i];
 769                 if (ctrl->info == NULL)
 770                         continue;
 771
 772                 list_for_each_entry(map, &ctrl->info->mappings, list) {
 773                         if ((map->id == v4l2_id) && !next) {
 774                                 *control = ctrl;
 775                                 *mapping = map;
 776                                 return;
 777                         }
 778
 779                         if ((*mapping == NULL || (*mapping)->id > map->id) &&
 780                             (map->id > v4l2_id) && next) {
 781                                 *control = ctrl;
 782                                 *mapping = map;
 783                         }
 784                 }
 785         }
 786 }
 787
 788 struct uvc_control *uvc_find_control(struct uvc_video_chain *chain,
 789         __u32 v4l2_id, struct uvc_control_mapping **mapping)
 790 {
 791         struct uvc_control *ctrl = NULL;
 792         struct uvc_entity *entity;
 793         int next = v4l2_id & V4L2_CTRL_FLAG_NEXT_CTRL;
 794
 795         *mapping = NULL;
 796
 797         /* Mask the query flags. */
 798         v4l2_id &= V4L2_CTRL_ID_MASK;
 799
 800         /* Find the control. */
 801         list_for_each_entry(entity, &chain->entities, chain) {
 802                 __uvc_find_control(entity, v4l2_id, mapping, &ctrl, next);
 803                 if (ctrl && !next)
 804                         return ctrl;
 805         }
 806
 807         if (ctrl == NULL && !next)
 808                 uvc_trace(UVC_TRACE_CONTROL, "Control 0x%08x not found.\n",
 809                                 v4l2_id);
 810
 811         return ctrl;
 812 }
 813
 814 static int uvc_ctrl_populate_cache(struct uvc_video_chain *chain,
 815         struct uvc_control *ctrl)
 816 {
 817         int ret;
 818
 819         if (ctrl->info->flags & UVC_CONTROL_GET_DEF) {
 820                 ret = uvc_query_ctrl(chain->dev, UVC_GET_DEF, ctrl->entity->id,
 821                                      chain->dev->intfnum, ctrl->info->selector,
 822                                      uvc_ctrl_data(ctrl, UVC_CTRL_DATA_DEF),
 823                                      ctrl->info->size);
 824                 if (ret < 0)
 825                         return ret;
 826         }
 827
 828         if (ctrl->info->flags & UVC_CONTROL_GET_MIN) {
 829                 ret = uvc_query_ctrl(chain->dev, UVC_GET_MIN, ctrl->entity->id,
 830                                      chain->dev->intfnum, ctrl->info->selector,
 831                                      uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MIN),
 832                                      ctrl->info->size);
 833                 if (ret < 0)
 834                         return ret;
 835         }
 836         if (ctrl->info->flags & UVC_CONTROL_GET_MAX) {
 837                 ret = uvc_query_ctrl(chain->dev, UVC_GET_MAX, ctrl->entity->id,
 838                                      chain->dev->intfnum, ctrl->info->selector,
 839                                      uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MAX),
 840                                      ctrl->info->size);
 841                 if (ret < 0)
 842                         return ret;
 843         }
 844         if (ctrl->info->flags & UVC_CONTROL_GET_RES) {
 845                 ret = uvc_query_ctrl(chain->dev, UVC_GET_RES, ctrl->entity->id,
 846                                      chain->dev->intfnum, ctrl->info->selector,
 847                                      uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES),
 848                                      ctrl->info->size);
 849                 if (ret < 0)
 850                         return ret;
 851         }
 852
 853         ctrl->cached = 1;
 854         return 0;
 855 }
 856
 857 int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
 858         struct v4l2_queryctrl *v4l2_ctrl)
 859 {
 860         struct uvc_control *ctrl;
 861         struct uvc_control_mapping *mapping;
 862         struct uvc_menu_info *menu;
 863         unsigned int i;
 864         int ret;
 865
 866         ctrl = uvc_find_control(chain, v4l2_ctrl->id, &mapping);
 867         if (ctrl == NULL)
 868                 return -EINVAL;
 869
 870         memset(v4l2_ctrl, 0, sizeof *v4l2_ctrl);
 871         v4l2_ctrl->id = mapping->id;
 872         v4l2_ctrl->type = mapping->v4l2_type;
 873         strlcpy(v4l2_ctrl->name, mapping->name, sizeof v4l2_ctrl->name);
 874         v4l2_ctrl->flags = 0;
 875
 876         if (!(ctrl->info->flags & UVC_CONTROL_GET_CUR))
 877                 v4l2_ctrl->flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
 878         if (!(ctrl->info->flags & UVC_CONTROL_SET_CUR))
 879                 v4l2_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
 880
 881         if (!ctrl->cached) {
 882                 ret = uvc_ctrl_populate_cache(chain, ctrl);
 883                 if (ret < 0)
 884                         return ret;
 885         }
 886
 887         if (ctrl->info->flags & UVC_CONTROL_GET_DEF) {
 888                 v4l2_ctrl->default_value = mapping->get(mapping, UVC_GET_DEF,
 889                                 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_DEF));
 890         }
 891
 892         switch (mapping->v4l2_type) {
 893         case V4L2_CTRL_TYPE_MENU:
 894                 v4l2_ctrl->minimum = 0;
 895                 v4l2_ctrl->maximum = mapping->menu_count - 1;
 896                 v4l2_ctrl->step = 1;
 897
 898                 menu = mapping->menu_info;
 899                 for (i = 0; i < mapping->menu_count; ++i, ++menu) {
 900                         if (menu->value == v4l2_ctrl->default_value) {
 901                                 v4l2_ctrl->default_value = i;
 902                                 break;
 903                         }
 904                 }
 905
 906                 return 0;
 907
 908         case V4L2_CTRL_TYPE_BOOLEAN:
 909                 v4l2_ctrl->minimum = 0;
 910                 v4l2_ctrl->maximum = 1;
 911                 v4l2_ctrl->step = 1;
 912                 return 0;
 913
 914         case V4L2_CTRL_TYPE_BUTTON:
 915                 v4l2_ctrl->minimum = 0;
 916                 v4l2_ctrl->maximum = 0;
 917                 v4l2_ctrl->step = 0;
 918                 return 0;
 919
 920         default:
 921                 break;
 922         }
 923
 924         if (ctrl->info->flags & UVC_CONTROL_GET_MIN)
 925                 v4l2_ctrl->minimum = mapping->get(mapping, UVC_GET_MIN,
 926                                      uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MIN));
 927
 928         if (ctrl->info->flags & UVC_CONTROL_GET_MAX)
 929                 v4l2_ctrl->maximum = mapping->get(mapping, UVC_GET_MAX,
 930                                      uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MAX));
 931
 932         if (ctrl->info->flags & UVC_CONTROL_GET_RES)
 933                 v4l2_ctrl->step = mapping->get(mapping, UVC_GET_RES,
 934                                   uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES));
 935
 936         return 0;
 937 }
 938
 939
 940 /* --------------------------------------------------------------------------
 941  * Control transactions
 942  *
 943  * To make extended set operations as atomic as the hardware allows, controls
 944  * are handled using begin/commit/rollback operations.
 945  *
 946  * At the beginning of a set request, uvc_ctrl_begin should be called to
 947  * initialize the request. This function acquires the control lock.
 948  *
 949  * When setting a control, the new value is stored in the control data field
 950  * at position UVC_CTRL_DATA_CURRENT. The control is then marked as dirty for
 951  * later processing. If the UVC and V4L2 control sizes differ, the current
 952  * value is loaded from the hardware before storing the new value in the data
 953  * field.
 954  *
 955  * After processing all controls in the transaction, uvc_ctrl_commit or
 956  * uvc_ctrl_rollback must be called to apply the pending changes to the
 957  * hardware or revert them. When applying changes, all controls marked as
 958  * dirty will be modified in the UVC device, and the dirty flag will be
 959  * cleared. When reverting controls, the control data field
 960  * UVC_CTRL_DATA_CURRENT is reverted to its previous value
 961  * (UVC_CTRL_DATA_BACKUP) for all dirty controls. Both functions release the
 962  * control lock.
 963  */
 964 int uvc_ctrl_begin(struct uvc_video_chain *chain)
 965 {
 966         return mutex_lock_interruptible(&chain->ctrl_mutex) ? -ERESTARTSYS : 0;
 967 }
 968
 969 static int uvc_ctrl_commit_entity(struct uvc_device *dev,
 970         struct uvc_entity *entity, int rollback)
 971 {
 972         struct uvc_control *ctrl;
 973         unsigned int i;
 974         int ret;
 975
 976         if (entity == NULL)
 977                 return 0;
 978
 979         for (i = 0; i < entity->ncontrols; ++i) {
 980                 ctrl = &entity->controls[i];
 981                 if (ctrl->info == NULL)
 982                         continue;
 983
 984                 /* Reset the loaded flag for auto-update controls that were
 985                  * marked as loaded in uvc_ctrl_get/uvc_ctrl_set to prevent
 986                  * uvc_ctrl_get from using the cached value.
 987                  */
 988                 if (ctrl->info->flags & UVC_CONTROL_AUTO_UPDATE)
 989                         ctrl->loaded = 0;
 990
 991                 if (!ctrl->dirty)
 992                         continue;
 993
 994                 if (!rollback)
 995                         ret = uvc_query_ctrl(dev, UVC_SET_CUR, ctrl->entity->id,
 996                                 dev->intfnum, ctrl->info->selector,
 997                                 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
 998                                 ctrl->info->size);
 999                 else
1000                         ret = 0;
1001
1002                 if (rollback || ret < 0)
1003                         memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1004                                uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
1005                                ctrl->info->size);
1006
1007                 ctrl->dirty = 0;
1008
1009                 if (ret < 0)
1010                         return ret;
1011         }
1012
1013         return 0;
1014 }
1015
1016 int __uvc_ctrl_commit(struct uvc_video_chain *chain, int rollback)
1017 {
1018         struct uvc_entity *entity;
1019         int ret = 0;
1020
1021         /* Find the control. */
1022         list_for_each_entry(entity, &chain->entities, chain) {
1023                 ret = uvc_ctrl_commit_entity(chain->dev, entity, rollback);
1024                 if (ret < 0)
1025                         goto done;
1026         }
1027
1028 done:
1029         mutex_unlock(&chain->ctrl_mutex);
1030         return ret;
1031 }
1032
1033 int uvc_ctrl_get(struct uvc_video_chain *chain,
1034         struct v4l2_ext_control *xctrl)
1035 {
1036         struct uvc_control *ctrl;
1037         struct uvc_control_mapping *mapping;
1038         struct uvc_menu_info *menu;
1039         unsigned int i;
1040         int ret;
1041
1042         ctrl = uvc_find_control(chain, xctrl->id, &mapping);
1043         if (ctrl == NULL || (ctrl->info->flags & UVC_CONTROL_GET_CUR) == 0)
1044                 return -EINVAL;
1045
1046         if (!ctrl->loaded) {
1047                 ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR, ctrl->entity->id,
1048                                 chain->dev->intfnum, ctrl->info->selector,
1049                                 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1050                                 ctrl->info->size);
1051                 if (ret < 0)
1052                         return ret;
1053
1054                 ctrl->loaded = 1;
1055         }
1056
1057         xctrl->value = mapping->get(mapping, UVC_GET_CUR,
1058                 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT));
1059
1060         if (mapping->v4l2_type == V4L2_CTRL_TYPE_MENU) {
1061                 menu = mapping->menu_info;
1062                 for (i = 0; i < mapping->menu_count; ++i, ++menu) {
1063                         if (menu->value == xctrl->value) {
1064                                 xctrl->value = i;
1065                                 break;
1066                         }
1067                 }
1068         }
1069
1070         return 0;
1071 }
1072
1073 int uvc_ctrl_set(struct uvc_video_chain *chain,
1074         struct v4l2_ext_control *xctrl)
1075 {
1076         struct uvc_control *ctrl;
1077         struct uvc_control_mapping *mapping;
1078         s32 value;
1079         u32 step;
1080         s32 min;
1081         s32 max;
1082         int ret;
1083
1084         ctrl = uvc_find_control(chain, xctrl->id, &mapping);
1085         if (ctrl == NULL || (ctrl->info->flags & UVC_CONTROL_SET_CUR) == 0)
1086                 return -EINVAL;
1087
1088         /* Clamp out of range values. */
1089         switch (mapping->v4l2_type) {
1090         case V4L2_CTRL_TYPE_INTEGER:
1091                 if (!ctrl->cached) {
1092                         ret = uvc_ctrl_populate_cache(chain, ctrl);
1093                         if (ret < 0)
1094                                 return ret;
1095                 }
1096
1097                 min = mapping->get(mapping, UVC_GET_MIN,
1098                                    uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MIN));
1099                 max = mapping->get(mapping, UVC_GET_MAX,
1100                                    uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MAX));
1101                 step = mapping->get(mapping, UVC_GET_RES,
1102                                     uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES));
1103                 if (step == 0)
1104                         step = 1;
1105
1106                 xctrl->value = min + (xctrl->value - min + step/2) / step * step;
1107                 xctrl->value = clamp(xctrl->value, min, max);
1108                 value = xctrl->value;
1109                 break;
1110
1111         case V4L2_CTRL_TYPE_BOOLEAN:
1112                 xctrl->value = clamp(xctrl->value, 0, 1);
1113                 value = xctrl->value;
1114                 break;
1115
1116         case V4L2_CTRL_TYPE_MENU:
1117                 if (xctrl->value < 0 || xctrl->value >= mapping->menu_count)
1118                         return -ERANGE;
1119                 value = mapping->menu_info[xctrl->value].value;
1120                 break;
1121
1122         default:
1123                 value = xctrl->value;
1124                 break;
1125         }
1126
1127         /* If the mapping doesn't span the whole UVC control, the current value
1128          * needs to be loaded from the device to perform the read-modify-write
1129          * operation.
1130          */
1131         if (!ctrl->loaded && (ctrl->info->size * 8) != mapping->size) {
1132                 if ((ctrl->info->flags & UVC_CONTROL_GET_CUR) == 0) {
1133                         memset(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1134                                 0, ctrl->info->size);
1135                 } else {
1136                         ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR,
1137                                 ctrl->entity->id, chain->dev->intfnum,
1138                                 ctrl->info->selector,
1139                                 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1140                                 ctrl->info->size);
1141                         if (ret < 0)
1142                                 return ret;
1143                 }
1144
1145                 ctrl->loaded = 1;
1146         }
1147
1148         /* Backup the current value in case we need to rollback later. */
1149         if (!ctrl->dirty) {
1150                 memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
1151                        uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1152                        ctrl->info->size);
1153         }
1154
1155         mapping->set(mapping, value,
1156                 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT));
1157
1158         ctrl->dirty = 1;
1159         ctrl->modified = 1;
1160         return 0;
1161 }
1162
1163 /* --------------------------------------------------------------------------
1164  * Dynamic controls
1165  */
1166
1167 int uvc_xu_ctrl_query(struct uvc_video_chain *chain,
1168         struct uvc_xu_control *xctrl, int set)
1169 {
1170         struct uvc_entity *entity;
1171         struct uvc_control *ctrl = NULL;
1172         unsigned int i, found = 0;
1173         __u8 *data;
1174         int ret;
1175
1176         /* Find the extension unit. */
1177         list_for_each_entry(entity, &chain->entities, chain) {
1178                 if (UVC_ENTITY_TYPE(entity) == UVC_VC_EXTENSION_UNIT &&
1179                     entity->id == xctrl->unit)
1180                         break;
1181         }
1182
1183         if (entity->id != xctrl->unit) {
1184                 uvc_trace(UVC_TRACE_CONTROL, "Extension unit %u not found.\n",
1185                         xctrl->unit);
1186                 return -EINVAL;
1187         }
1188
1189         /* Find the control. */
1190         for (i = 0; i < entity->ncontrols; ++i) {
1191                 ctrl = &entity->controls[i];
1192                 if (ctrl->info == NULL)
1193                         continue;
1194
1195                 if (ctrl->info->selector == xctrl->selector) {
1196                         found = 1;
1197                         break;
1198                 }
1199         }
1200
1201         if (!found) {
1202                 uvc_trace(UVC_TRACE_CONTROL, "Control %pUl/%u not found.\n",
1203                         entity->extension.guidExtensionCode, xctrl->selector);
1204                 return -EINVAL;
1205         }
1206
1207         /* Validate control data size. */
1208         if (ctrl->info->size != xctrl->size)
1209                 return -EINVAL;
1210
1211         if ((set && !(ctrl->info->flags & UVC_CONTROL_SET_CUR)) ||
1212             (!set && !(ctrl->info->flags & UVC_CONTROL_GET_CUR)))
1213                 return -EINVAL;
1214
1215         if (mutex_lock_interruptible(&chain->ctrl_mutex))
1216                 return -ERESTARTSYS;
1217
1218         memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
1219                uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1220                xctrl->size);
1221         data = uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT);
1222
1223         if (set && copy_from_user(data, xctrl->data, xctrl->size)) {
1224                 ret = -EFAULT;
1225                 goto out;
1226         }
1227
1228         ret = uvc_query_ctrl(chain->dev, set ? UVC_SET_CUR : UVC_GET_CUR,
1229                              xctrl->unit, chain->dev->intfnum, xctrl->selector,
1230                              data, xctrl->size);
1231         if (ret < 0)
1232                 goto out;
1233
1234         if (!set && copy_to_user(xctrl->data, data, xctrl->size)) {
1235                 ret = -EFAULT;
1236                 goto out;
1237         }
1238
1239 out:
1240         if (ret)
1241                 memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1242                        uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
1243                        xctrl->size);
1244
1245         mutex_unlock(&chain->ctrl_mutex);
1246         return ret;
1247 }
1248
1249 /* --------------------------------------------------------------------------
1250  * Suspend/resume
1251  */
1252
1253 /*
1254  * Restore control values after resume, skipping controls that haven't been
1255  * changed.
1256  *
1257  * TODO
1258  * - Don't restore modified controls that are back to their default value.
1259  * - Handle restore order (Auto-Exposure Mode should be restored before
1260  *   Exposure Time).
1261  */
1262 int uvc_ctrl_resume_device(struct uvc_device *dev)
1263 {
1264         struct uvc_control *ctrl;
1265         struct uvc_entity *entity;
1266         unsigned int i;
1267         int ret;
1268
1269         /* Walk the entities list and restore controls when possible. */
1270         list_for_each_entry(entity, &dev->entities, list) {
1271
1272                 for (i = 0; i < entity->ncontrols; ++i) {
1273                         ctrl = &entity->controls[i];
1274
1275                         if (ctrl->info == NULL || !ctrl->modified ||
1276                             (ctrl->info->flags & UVC_CONTROL_RESTORE) == 0)
1277                                 continue;
1278
1279                         printk(KERN_INFO "restoring control %pUl/%u/%u\n",
1280                                 ctrl->info->entity, ctrl->info->index,
1281                                 ctrl->info->selector);
1282                         ctrl->dirty = 1;
1283                 }
1284
1285                 ret = uvc_ctrl_commit_entity(dev, entity, 0);
1286                 if (ret < 0)
1287                         return ret;
1288         }
1289
1290         return 0;
1291 }
1292
1293 /* --------------------------------------------------------------------------
1294  * Control and mapping handling
1295  */
1296
1297 /*
1298  * Query control information (size and flags) for XU controls.
1299  */
1300 static int uvc_ctrl_fill_xu_info(struct uvc_device *dev,
1301         const struct uvc_control *ctrl, struct uvc_control_info *info)
1302 {
1303         u8 *data;
1304         int ret;
1305
1306         data = kmalloc(2, GFP_KERNEL);
1307         if (data == NULL)
1308                 return -ENOMEM;
1309
1310         memcpy(info->entity, ctrl->entity->extension.guidExtensionCode,
1311                sizeof(info->entity));
1312         info->index = ctrl->index;
1313         info->selector = ctrl->index + 1;
1314
1315         /* Query and verify the control length (GET_LEN) */
1316         ret = uvc_query_ctrl(dev, UVC_GET_LEN, ctrl->entity->id, dev->intfnum,
1317                              info->selector, data, 2);
1318         if (ret < 0) {
1319                 uvc_trace(UVC_TRACE_CONTROL,
1320                           "GET_LEN failed on control %pUl/%u (%d).\n",
1321                            info->entity, info->selector, ret);
1322                 goto done;
1323         }
1324
1325         info->size = le16_to_cpup((__le16 *)data);
1326
1327         /* Query the control information (GET_INFO) */
1328         ret = uvc_query_ctrl(dev, UVC_GET_INFO, ctrl->entity->id, dev->intfnum,
1329                              info->selector, data, 1);
1330         if (ret < 0) {
1331                 uvc_trace(UVC_TRACE_CONTROL,
1332                           "GET_INFO failed on control %pUl/%u (%d).\n",
1333                           info->entity, info->selector, ret);
1334                 goto done;
1335         }
1336
1337         info->flags = UVC_CONTROL_GET_MIN | UVC_CONTROL_GET_MAX
1338                     | UVC_CONTROL_GET_RES | UVC_CONTROL_GET_DEF
1339                     | (data[0] & UVC_CONTROL_CAP_GET ? UVC_CONTROL_GET_CUR : 0)
1340                     | (data[0] & UVC_CONTROL_CAP_SET ? UVC_CONTROL_SET_CUR : 0)
1341                     | (data[0] & UVC_CONTROL_CAP_AUTOUPDATE ?
1342                        UVC_CONTROL_AUTO_UPDATE : 0);
1343
1344         uvc_trace(UVC_TRACE_CONTROL, "XU control %pUl/%u queried: len %u, "
1345                   "flags { get %u set %u auto %u }.\n",
1346                   info->entity, info->selector, info->size,
1347                   (info->flags & UVC_CONTROL_GET_CUR) ? 1 : 0,
1348                   (info->flags & UVC_CONTROL_SET_CUR) ? 1 : 0,
1349                   (info->flags & UVC_CONTROL_AUTO_UPDATE) ? 1 : 0);
1350
1351 done:
1352         kfree(data);
1353         return ret;
1354 }
1355
1356 /*
1357  * Add control information to a given control.
1358  */
1359 static int uvc_ctrl_add_info(struct uvc_device *dev, struct uvc_control *ctrl,
1360         const struct uvc_control_info *info)
1361 {
1362         int ret = 0;
1363
1364         /* Clone the control info struct for this device's instance */
1365         ctrl->info = kmemdup(info, sizeof(*info), GFP_KERNEL);
1366         if (ctrl->info == NULL) {
1367                 ret = -ENOMEM;
1368                 goto done;
1369         }
1370         INIT_LIST_HEAD(&ctrl->info->mappings);
1371
1372         /* Allocate an array to save control values (cur, def, max, etc.) */
1373         ctrl->uvc_data = kzalloc(ctrl->info->size * UVC_CTRL_DATA_LAST + 1,
1374                                  GFP_KERNEL);
1375         if (ctrl->uvc_data == NULL) {
1376                 ret = -ENOMEM;
1377                 goto done;
1378         }
1379
1380         uvc_trace(UVC_TRACE_CONTROL, "Added control %pUl/%u to device %s "
1381                 "entity %u\n", ctrl->info->entity, ctrl->info->selector,
1382                 dev->udev->devpath, ctrl->entity->id);
1383
1384 done:
1385         if (ret < 0) {
1386                 kfree(ctrl->uvc_data);
1387                 kfree(ctrl->info);
1388         }
1389         return ret;
1390 }
1391
1392 /*
1393  * Add a control mapping to a given control.
1394  */
1395 static int __uvc_ctrl_add_mapping(struct uvc_device *dev,
1396         struct uvc_control *ctrl, const struct uvc_control_mapping *mapping)
1397 {
1398         struct uvc_control_mapping *map;
1399         unsigned int size;
1400
1401         /* Most mappings come from static kernel data and need to be duplicated.
1402          * Mappings that come from userspace will be unnecessarily duplicated,
1403          * this could be optimized.
1404          */
1405         map = kmemdup(mapping, sizeof(*mapping), GFP_KERNEL);
1406         if (map == NULL)
1407                 return -ENOMEM;
1408
1409         size = sizeof(*mapping->menu_info) * mapping->menu_count;
1410         map->menu_info = kmemdup(mapping->menu_info, size, GFP_KERNEL);
1411         if (map->menu_info == NULL) {
1412                 kfree(map);
1413                 return -ENOMEM;
1414         }
1415
1416         if (map->get == NULL)
1417                 map->get = uvc_get_le_value;
1418         if (map->set == NULL)
1419                 map->set = uvc_set_le_value;
1420
1421         map->ctrl = ctrl->info;
1422         list_add_tail(&map->list, &ctrl->info->mappings);
1423         uvc_trace(UVC_TRACE_CONTROL,
1424                 "Adding mapping '%s' to control %pUl/%u.\n",
1425                 map->name, ctrl->info->entity, ctrl->info->selector);
1426
1427         return 0;
1428 }
1429
1430 int uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
1431         const struct uvc_control_mapping *mapping)
1432 {
1433         struct uvc_device *dev = chain->dev;
1434         struct uvc_control_mapping *map;
1435         struct uvc_entity *entity;
1436         struct uvc_control *ctrl;
1437         int found = 0;
1438         int ret;
1439
1440         if (mapping->id & ~V4L2_CTRL_ID_MASK) {
1441                 uvc_trace(UVC_TRACE_CONTROL, "Can't add mapping '%s', control "
1442                         "control id 0x%08x is invalid.\n", mapping->name,
1443                         mapping->id);
1444                 return -EINVAL;
1445         }
1446
1447         /* Search for the matching (GUID/CS) control in the given device */
1448         list_for_each_entry(entity, &dev->entities, list) {
1449                 unsigned int i;
1450
1451                 if (!uvc_entity_match_guid(entity, mapping->entity))
1452                         continue;
1453
1454                 for (i = 0; i < entity->ncontrols; ++i) {
1455                         ctrl = &entity->controls[i];
1456                         if (ctrl->info != NULL &&
1457                             ctrl->info->selector == mapping->selector) {
1458                                 found = 1;
1459                                 break;
1460                         }
1461                 }
1462
1463                 if (found)
1464                         break;
1465         }
1466         if (!found)
1467                 return -ENOENT;
1468
1469         if (mutex_lock_interruptible(&chain->ctrl_mutex))
1470                 return -ERESTARTSYS;
1471
1472         list_for_each_entry(map, &ctrl->info->mappings, list) {
1473                 if (mapping->id == map->id) {
1474                         uvc_trace(UVC_TRACE_CONTROL, "Can't add mapping '%s', "
1475                                 "control id 0x%08x already exists.\n",
1476                                 mapping->name, mapping->id);
1477                         ret = -EEXIST;
1478                         goto done;
1479                 }
1480         }
1481
1482         /* Prevent excess memory consumption */
1483         if (atomic_inc_return(&dev->nmappings) > UVC_MAX_CONTROL_MAPPINGS) {
1484                 atomic_dec(&dev->nmappings);
1485                 uvc_trace(UVC_TRACE_CONTROL, "Can't add mapping '%s', maximum "
1486                         "mappings count (%u) exceeded.\n", mapping->name,
1487                         UVC_MAX_CONTROL_MAPPINGS);
1488                 ret = -ENOMEM;
1489                 goto done;
1490         }
1491
1492         ret = __uvc_ctrl_add_mapping(dev, ctrl, mapping);
1493         if (ret < 0)
1494                 atomic_dec(&dev->nmappings);
1495
1496 done:
1497         mutex_unlock(&chain->ctrl_mutex);
1498         return ret;
1499 }
1500
1501 /*
1502  * Prune an entity of its bogus controls using a blacklist. Bogus controls
1503  * are currently the ones that crash the camera or unconditionally return an
1504  * error when queried.
1505  */
1506 static void uvc_ctrl_prune_entity(struct uvc_device *dev,
1507         struct uvc_entity *entity)
1508 {
1509         struct uvc_ctrl_blacklist {
1510                 struct usb_device_id id;
1511                 u8 index;
1512         };
1513
1514         static const struct uvc_ctrl_blacklist processing_blacklist[] = {
1515                 { { USB_DEVICE(0x13d3, 0x509b) }, 9 }, /* Gain */
1516                 { { USB_DEVICE(0x1c4f, 0x3000) }, 6 }, /* WB Temperature */
1517                 { { USB_DEVICE(0x5986, 0x0241) }, 2 }, /* Hue */
1518         };
1519         static const struct uvc_ctrl_blacklist camera_blacklist[] = {
1520                 { { USB_DEVICE(0x06f8, 0x3005) }, 9 }, /* Zoom, Absolute */
1521         };
1522
1523         const struct uvc_ctrl_blacklist *blacklist;
1524         unsigned int size;
1525         unsigned int count;
1526         unsigned int i;
1527         u8 *controls;
1528
1529         switch (UVC_ENTITY_TYPE(entity)) {
1530         case UVC_VC_PROCESSING_UNIT:
1531                 blacklist = processing_blacklist;
1532                 count = ARRAY_SIZE(processing_blacklist);
1533                 controls = entity->processing.bmControls;
1534                 size = entity->processing.bControlSize;
1535                 break;
1536
1537         case UVC_ITT_CAMERA:
1538                 blacklist = camera_blacklist;
1539                 count = ARRAY_SIZE(camera_blacklist);
1540                 controls = entity->camera.bmControls;
1541                 size = entity->camera.bControlSize;
1542                 break;
1543
1544         default:
1545                 return;
1546         }
1547
1548         for (i = 0; i < count; ++i) {
1549                 if (!usb_match_one_id(dev->intf, &blacklist[i].id))
1550                         continue;
1551
1552                 if (blacklist[i].index >= 8 * size ||
1553                     !uvc_test_bit(controls, blacklist[i].index))
1554                         continue;
1555
1556                 uvc_trace(UVC_TRACE_CONTROL, "%u/%u control is black listed, "
1557                         "removing it.\n", entity->id, blacklist[i].index);
1558
1559                 uvc_clear_bit(controls, blacklist[i].index);
1560         }
1561 }
1562
1563 /*
1564  * Add control information and hardcoded stock control mappings to the given
1565  * device.
1566  */
1567 static void uvc_ctrl_init_ctrl(struct uvc_device *dev, struct uvc_control *ctrl)
1568 {
1569         const struct uvc_control_info *info = uvc_ctrls;
1570         const struct uvc_control_info *iend = info + ARRAY_SIZE(uvc_ctrls);
1571         const struct uvc_control_mapping *mapping = uvc_ctrl_mappings;
1572         const struct uvc_control_mapping *mend =
1573                 mapping + ARRAY_SIZE(uvc_ctrl_mappings);
1574
1575         /* Query XU controls for control information */
1576         if (UVC_ENTITY_TYPE(ctrl->entity) == UVC_VC_EXTENSION_UNIT) {
1577                 struct uvc_control_info info;
1578                 int ret;
1579
1580                 ret = uvc_ctrl_fill_xu_info(dev, ctrl, &info);
1581                 if (ret < 0)
1582                         return;
1583
1584                 ret = uvc_ctrl_add_info(dev, ctrl, &info);
1585                 if (ret < 0) {
1586                         /* Skip the control */
1587                         uvc_trace(UVC_TRACE_CONTROL, "Failed to initialize "
1588                                 "control %pUl/%u on device %s entity %u\n",
1589                                 info.entity, info.selector, dev->udev->devpath,
1590                                 ctrl->entity->id);
1591                         memset(ctrl, 0, sizeof(*ctrl));
1592                 }
1593                 return;
1594         }
1595
1596         for (; info < iend; ++info) {
1597                 if (uvc_entity_match_guid(ctrl->entity, info->entity) &&
1598                     ctrl->index == info->index) {
1599                         uvc_ctrl_add_info(dev, ctrl, info);
1600                         break;
1601                  }
1602         }
1603
1604         if (ctrl->info == NULL)
1605                 return;
1606
1607         for (; mapping < mend; ++mapping) {
1608                 if (uvc_entity_match_guid(ctrl->entity, mapping->entity) &&
1609                     ctrl->info->selector == mapping->selector)
1610                         __uvc_ctrl_add_mapping(dev, ctrl, mapping);
1611         }
1612 }
1613
1614 /*
1615  * Initialize device controls.
1616  */
1617 int uvc_ctrl_init_device(struct uvc_device *dev)
1618 {
1619         struct uvc_entity *entity;
1620         unsigned int i;
1621
1622         /* Walk the entities list and instantiate controls */
1623         list_for_each_entry(entity, &dev->entities, list) {
1624                 struct uvc_control *ctrl;
1625                 unsigned int bControlSize = 0, ncontrols = 0;
1626                 __u8 *bmControls = NULL;
1627
1628                 if (UVC_ENTITY_TYPE(entity) == UVC_VC_EXTENSION_UNIT) {
1629                         bmControls = entity->extension.bmControls;
1630                         bControlSize = entity->extension.bControlSize;
1631                 } else if (UVC_ENTITY_TYPE(entity) == UVC_VC_PROCESSING_UNIT) {
1632                         bmControls = entity->processing.bmControls;
1633                         bControlSize = entity->processing.bControlSize;
1634                 } else if (UVC_ENTITY_TYPE(entity) == UVC_ITT_CAMERA) {
1635                         bmControls = entity->camera.bmControls;
1636                         bControlSize = entity->camera.bControlSize;
1637                 }
1638
1639                 /* Remove bogus/blacklisted controls */
1640                 uvc_ctrl_prune_entity(dev, entity);
1641
1642                 /* Count supported controls and allocate the controls array */
1643                 for (i = 0; i < bControlSize; ++i)
1644                         ncontrols += hweight8(bmControls[i]);
1645                 if (ncontrols == 0)
1646                         continue;
1647
1648                 entity->controls = kzalloc(ncontrols * sizeof(*ctrl),
1649                                            GFP_KERNEL);
1650                 if (entity->controls == NULL)
1651                         return -ENOMEM;
1652                 entity->ncontrols = ncontrols;
1653
1654                 /* Initialize all supported controls */
1655                 ctrl = entity->controls;
1656                 for (i = 0; i < bControlSize * 8; ++i) {
1657                         if (uvc_test_bit(bmControls, i) == 0)
1658                                 continue;
1659
1660                         ctrl->entity = entity;
1661                         ctrl->index = i;
1662
1663                         uvc_ctrl_init_ctrl(dev, ctrl);
1664                         ctrl++;
1665                 }
1666         }
1667
1668         return 0;
1669 }
1670
1671 /*
1672  * Cleanup device controls.
1673  */
1674 static void uvc_ctrl_cleanup_mappings(struct uvc_device *dev,
1675         struct uvc_control *ctrl)
1676 {
1677         struct uvc_control_mapping *mapping, *nm;
1678
1679         list_for_each_entry_safe(mapping, nm, &ctrl->info->mappings, list) {
1680                 list_del(&mapping->list);
1681                 kfree(mapping->menu_info);
1682                 kfree(mapping);
1683         }
1684 }
1685
1686 void uvc_ctrl_cleanup_device(struct uvc_device *dev)
1687 {
1688         struct uvc_entity *entity;
1689         unsigned int i;
1690
1691         /* Free controls and control mappings for all entities. */
1692         list_for_each_entry(entity, &dev->entities, list) {
1693                 for (i = 0; i < entity->ncontrols; ++i) {
1694                         struct uvc_control *ctrl = &entity->controls[i];
1695
1696                         if (ctrl->info == NULL)
1697                                 continue;
1698
1699                         uvc_ctrl_cleanup_mappings(dev, ctrl);
1700                         kfree(ctrl->uvc_data);
1701                         kfree(ctrl->info);
1702                 }
1703
1704                 kfree(entity->controls);
1705         }
1706 }