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   1 /*
   2  *      uvc_ctrl.c  --  USB Video Class driver - Controls
   3  *
   4  *      Copyright (C) 2005-2009
   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/list.h>
  16 #include <linux/module.h>
  17 #include <linux/uaccess.h>
  18 #include <linux/usb.h>
  19 #include <linux/videodev2.h>
  20 #include <linux/vmalloc.h>
  21 #include <linux/wait.h>
  22 #include <asm/atomic.h>
  23
  24 #include "uvcvideo.h"
  25
  26 #define UVC_CTRL_NDATA          2
  27 #define UVC_CTRL_DATA_CURRENT   0
  28 #define UVC_CTRL_DATA_BACKUP    1
  29
  30 /* ------------------------------------------------------------------------
  31  * Controls
  32  */
  33
  34 static struct uvc_control_info uvc_ctrls[] = {
  35         {
  36                 .entity         = UVC_GUID_UVC_PROCESSING,
  37                 .selector       = PU_BRIGHTNESS_CONTROL,
  38                 .index          = 0,
  39                 .size           = 2,
  40                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
  41                                 | UVC_CONTROL_RESTORE,
  42         },
  43         {
  44                 .entity         = UVC_GUID_UVC_PROCESSING,
  45                 .selector       = PU_CONTRAST_CONTROL,
  46                 .index          = 1,
  47                 .size           = 2,
  48                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
  49                                 | UVC_CONTROL_RESTORE,
  50         },
  51         {
  52                 .entity         = UVC_GUID_UVC_PROCESSING,
  53                 .selector       = PU_HUE_CONTROL,
  54                 .index          = 2,
  55                 .size           = 2,
  56                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
  57                                 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
  58         },
  59         {
  60                 .entity         = UVC_GUID_UVC_PROCESSING,
  61                 .selector       = PU_SATURATION_CONTROL,
  62                 .index          = 3,
  63                 .size           = 2,
  64                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
  65                                 | UVC_CONTROL_RESTORE,
  66         },
  67         {
  68                 .entity         = UVC_GUID_UVC_PROCESSING,
  69                 .selector       = PU_SHARPNESS_CONTROL,
  70                 .index          = 4,
  71                 .size           = 2,
  72                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
  73                                 | UVC_CONTROL_RESTORE,
  74         },
  75         {
  76                 .entity         = UVC_GUID_UVC_PROCESSING,
  77                 .selector       = PU_GAMMA_CONTROL,
  78                 .index          = 5,
  79                 .size           = 2,
  80                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
  81                                 | UVC_CONTROL_RESTORE,
  82         },
  83         {
  84                 .entity         = UVC_GUID_UVC_PROCESSING,
  85                 .selector       = PU_WHITE_BALANCE_TEMPERATURE_CONTROL,
  86                 .index          = 6,
  87                 .size           = 2,
  88                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
  89                                 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
  90         },
  91         {
  92                 .entity         = UVC_GUID_UVC_PROCESSING,
  93                 .selector       = PU_WHITE_BALANCE_COMPONENT_CONTROL,
  94                 .index          = 7,
  95                 .size           = 4,
  96                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
  97                                 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
  98         },
  99         {
 100                 .entity         = UVC_GUID_UVC_PROCESSING,
 101                 .selector       = PU_BACKLIGHT_COMPENSATION_CONTROL,
 102                 .index          = 8,
 103                 .size           = 2,
 104                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 105                                 | UVC_CONTROL_RESTORE,
 106         },
 107         {
 108                 .entity         = UVC_GUID_UVC_PROCESSING,
 109                 .selector       = PU_GAIN_CONTROL,
 110                 .index          = 9,
 111                 .size           = 2,
 112                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 113                                 | UVC_CONTROL_RESTORE,
 114         },
 115         {
 116                 .entity         = UVC_GUID_UVC_PROCESSING,
 117                 .selector       = PU_POWER_LINE_FREQUENCY_CONTROL,
 118                 .index          = 10,
 119                 .size           = 1,
 120                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 121                                 | UVC_CONTROL_RESTORE,
 122         },
 123         {
 124                 .entity         = UVC_GUID_UVC_PROCESSING,
 125                 .selector       = PU_HUE_AUTO_CONTROL,
 126                 .index          = 11,
 127                 .size           = 1,
 128                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 129                                 | UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
 130         },
 131         {
 132                 .entity         = UVC_GUID_UVC_PROCESSING,
 133                 .selector       = PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL,
 134                 .index          = 12,
 135                 .size           = 1,
 136                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 137                                 | UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
 138         },
 139         {
 140                 .entity         = UVC_GUID_UVC_PROCESSING,
 141                 .selector       = PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL,
 142                 .index          = 13,
 143                 .size           = 1,
 144                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 145                                 | UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
 146         },
 147         {
 148                 .entity         = UVC_GUID_UVC_PROCESSING,
 149                 .selector       = PU_DIGITAL_MULTIPLIER_CONTROL,
 150                 .index          = 14,
 151                 .size           = 2,
 152                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 153                                 | UVC_CONTROL_RESTORE,
 154         },
 155         {
 156                 .entity         = UVC_GUID_UVC_PROCESSING,
 157                 .selector       = PU_DIGITAL_MULTIPLIER_LIMIT_CONTROL,
 158                 .index          = 15,
 159                 .size           = 2,
 160                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 161                                 | UVC_CONTROL_RESTORE,
 162         },
 163         {
 164                 .entity         = UVC_GUID_UVC_PROCESSING,
 165                 .selector       = PU_ANALOG_VIDEO_STANDARD_CONTROL,
 166                 .index          = 16,
 167                 .size           = 1,
 168                 .flags          = UVC_CONTROL_GET_CUR,
 169         },
 170         {
 171                 .entity         = UVC_GUID_UVC_PROCESSING,
 172                 .selector       = PU_ANALOG_LOCK_STATUS_CONTROL,
 173                 .index          = 17,
 174                 .size           = 1,
 175                 .flags          = UVC_CONTROL_GET_CUR,
 176         },
 177         {
 178                 .entity         = UVC_GUID_UVC_CAMERA,
 179                 .selector       = CT_SCANNING_MODE_CONTROL,
 180                 .index          = 0,
 181                 .size           = 1,
 182                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 183                                 | UVC_CONTROL_RESTORE,
 184         },
 185         {
 186                 .entity         = UVC_GUID_UVC_CAMERA,
 187                 .selector       = CT_AE_MODE_CONTROL,
 188                 .index          = 1,
 189                 .size           = 1,
 190                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 191                                 | UVC_CONTROL_GET_DEF | UVC_CONTROL_GET_RES
 192                                 | UVC_CONTROL_RESTORE,
 193         },
 194         {
 195                 .entity         = UVC_GUID_UVC_CAMERA,
 196                 .selector       = CT_AE_PRIORITY_CONTROL,
 197                 .index          = 2,
 198                 .size           = 1,
 199                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 200                                 | UVC_CONTROL_RESTORE,
 201         },
 202         {
 203                 .entity         = UVC_GUID_UVC_CAMERA,
 204                 .selector       = CT_EXPOSURE_TIME_ABSOLUTE_CONTROL,
 205                 .index          = 3,
 206                 .size           = 4,
 207                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 208                                 | UVC_CONTROL_RESTORE,
 209         },
 210         {
 211                 .entity         = UVC_GUID_UVC_CAMERA,
 212                 .selector       = CT_EXPOSURE_TIME_RELATIVE_CONTROL,
 213                 .index          = 4,
 214                 .size           = 1,
 215                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 216                                 | UVC_CONTROL_RESTORE,
 217         },
 218         {
 219                 .entity         = UVC_GUID_UVC_CAMERA,
 220                 .selector       = CT_FOCUS_ABSOLUTE_CONTROL,
 221                 .index          = 5,
 222                 .size           = 2,
 223                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 224                                 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
 225         },
 226         {
 227                 .entity         = UVC_GUID_UVC_CAMERA,
 228                 .selector       = CT_FOCUS_RELATIVE_CONTROL,
 229                 .index          = 6,
 230                 .size           = 2,
 231                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 232                                 | UVC_CONTROL_AUTO_UPDATE,
 233         },
 234         {
 235                 .entity         = UVC_GUID_UVC_CAMERA,
 236                 .selector       = CT_IRIS_ABSOLUTE_CONTROL,
 237                 .index          = 7,
 238                 .size           = 2,
 239                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 240                                 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
 241         },
 242         {
 243                 .entity         = UVC_GUID_UVC_CAMERA,
 244                 .selector       = CT_IRIS_RELATIVE_CONTROL,
 245                 .index          = 8,
 246                 .size           = 1,
 247                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 248                                 | UVC_CONTROL_AUTO_UPDATE,
 249         },
 250         {
 251                 .entity         = UVC_GUID_UVC_CAMERA,
 252                 .selector       = CT_ZOOM_ABSOLUTE_CONTROL,
 253                 .index          = 9,
 254                 .size           = 2,
 255                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 256                                 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
 257         },
 258         {
 259                 .entity         = UVC_GUID_UVC_CAMERA,
 260                 .selector       = CT_ZOOM_RELATIVE_CONTROL,
 261                 .index          = 10,
 262                 .size           = 3,
 263                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 264                                 | UVC_CONTROL_AUTO_UPDATE,
 265         },
 266         {
 267                 .entity         = UVC_GUID_UVC_CAMERA,
 268                 .selector       = CT_PANTILT_ABSOLUTE_CONTROL,
 269                 .index          = 11,
 270                 .size           = 8,
 271                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 272                                 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
 273         },
 274         {
 275                 .entity         = UVC_GUID_UVC_CAMERA,
 276                 .selector       = CT_PANTILT_RELATIVE_CONTROL,
 277                 .index          = 12,
 278                 .size           = 4,
 279                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 280                                 | UVC_CONTROL_AUTO_UPDATE,
 281         },
 282         {
 283                 .entity         = UVC_GUID_UVC_CAMERA,
 284                 .selector       = CT_ROLL_ABSOLUTE_CONTROL,
 285                 .index          = 13,
 286                 .size           = 2,
 287                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 288                                 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
 289         },
 290         {
 291                 .entity         = UVC_GUID_UVC_CAMERA,
 292                 .selector       = CT_ROLL_RELATIVE_CONTROL,
 293                 .index          = 14,
 294                 .size           = 2,
 295                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
 296                                 | UVC_CONTROL_AUTO_UPDATE,
 297         },
 298         {
 299                 .entity         = UVC_GUID_UVC_CAMERA,
 300                 .selector       = CT_FOCUS_AUTO_CONTROL,
 301                 .index          = 17,
 302                 .size           = 1,
 303                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 304                                 | UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
 305         },
 306         {
 307                 .entity         = UVC_GUID_UVC_CAMERA,
 308                 .selector       = CT_PRIVACY_CONTROL,
 309                 .index          = 18,
 310                 .size           = 1,
 311                 .flags          = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
 312                                 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
 313         },
 314 };
 315
 316 static struct uvc_menu_info power_line_frequency_controls[] = {
 317         { 0, "Disabled" },
 318         { 1, "50 Hz" },
 319         { 2, "60 Hz" },
 320 };
 321
 322 static struct uvc_menu_info exposure_auto_controls[] = {
 323         { 2, "Auto Mode" },
 324         { 1, "Manual Mode" },
 325         { 4, "Shutter Priority Mode" },
 326         { 8, "Aperture Priority Mode" },
 327 };
 328
 329 static __s32 uvc_ctrl_get_zoom(struct uvc_control_mapping *mapping,
 330         __u8 query, const __u8 *data)
 331 {
 332         __s8 zoom = (__s8)data[0];
 333
 334         switch (query) {
 335         case GET_CUR:
 336                 return (zoom == 0) ? 0 : (zoom > 0 ? data[2] : -data[2]);
 337
 338         case GET_MIN:
 339         case GET_MAX:
 340         case GET_RES:
 341         case GET_DEF:
 342         default:
 343                 return data[2];
 344         }
 345 }
 346
 347 static void uvc_ctrl_set_zoom(struct uvc_control_mapping *mapping,
 348         __s32 value, __u8 *data)
 349 {
 350         data[0] = value == 0 ? 0 : (value > 0) ? 1 : 0xff;
 351         data[2] = min(abs(value), 0xff);
 352 }
 353
 354 static struct uvc_control_mapping uvc_ctrl_mappings[] = {
 355         {
 356                 .id             = V4L2_CID_BRIGHTNESS,
 357                 .name           = "Brightness",
 358                 .entity         = UVC_GUID_UVC_PROCESSING,
 359                 .selector       = PU_BRIGHTNESS_CONTROL,
 360                 .size           = 16,
 361                 .offset         = 0,
 362                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 363                 .data_type      = UVC_CTRL_DATA_TYPE_SIGNED,
 364         },
 365         {
 366                 .id             = V4L2_CID_CONTRAST,
 367                 .name           = "Contrast",
 368                 .entity         = UVC_GUID_UVC_PROCESSING,
 369                 .selector       = PU_CONTRAST_CONTROL,
 370                 .size           = 16,
 371                 .offset         = 0,
 372                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 373                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 374         },
 375         {
 376                 .id             = V4L2_CID_HUE,
 377                 .name           = "Hue",
 378                 .entity         = UVC_GUID_UVC_PROCESSING,
 379                 .selector       = PU_HUE_CONTROL,
 380                 .size           = 16,
 381                 .offset         = 0,
 382                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 383                 .data_type      = UVC_CTRL_DATA_TYPE_SIGNED,
 384         },
 385         {
 386                 .id             = V4L2_CID_SATURATION,
 387                 .name           = "Saturation",
 388                 .entity         = UVC_GUID_UVC_PROCESSING,
 389                 .selector       = PU_SATURATION_CONTROL,
 390                 .size           = 16,
 391                 .offset         = 0,
 392                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 393                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 394         },
 395         {
 396                 .id             = V4L2_CID_SHARPNESS,
 397                 .name           = "Sharpness",
 398                 .entity         = UVC_GUID_UVC_PROCESSING,
 399                 .selector       = PU_SHARPNESS_CONTROL,
 400                 .size           = 16,
 401                 .offset         = 0,
 402                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 403                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 404         },
 405         {
 406                 .id             = V4L2_CID_GAMMA,
 407                 .name           = "Gamma",
 408                 .entity         = UVC_GUID_UVC_PROCESSING,
 409                 .selector       = PU_GAMMA_CONTROL,
 410                 .size           = 16,
 411                 .offset         = 0,
 412                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 413                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 414         },
 415         {
 416                 .id             = V4L2_CID_BACKLIGHT_COMPENSATION,
 417                 .name           = "Backlight Compensation",
 418                 .entity         = UVC_GUID_UVC_PROCESSING,
 419                 .selector       = PU_BACKLIGHT_COMPENSATION_CONTROL,
 420                 .size           = 16,
 421                 .offset         = 0,
 422                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 423                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 424         },
 425         {
 426                 .id             = V4L2_CID_GAIN,
 427                 .name           = "Gain",
 428                 .entity         = UVC_GUID_UVC_PROCESSING,
 429                 .selector       = PU_GAIN_CONTROL,
 430                 .size           = 16,
 431                 .offset         = 0,
 432                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 433                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 434         },
 435         {
 436                 .id             = V4L2_CID_POWER_LINE_FREQUENCY,
 437                 .name           = "Power Line Frequency",
 438                 .entity         = UVC_GUID_UVC_PROCESSING,
 439                 .selector       = PU_POWER_LINE_FREQUENCY_CONTROL,
 440                 .size           = 2,
 441                 .offset         = 0,
 442                 .v4l2_type      = V4L2_CTRL_TYPE_MENU,
 443                 .data_type      = UVC_CTRL_DATA_TYPE_ENUM,
 444                 .menu_info      = power_line_frequency_controls,
 445                 .menu_count     = ARRAY_SIZE(power_line_frequency_controls),
 446         },
 447         {
 448                 .id             = V4L2_CID_HUE_AUTO,
 449                 .name           = "Hue, Auto",
 450                 .entity         = UVC_GUID_UVC_PROCESSING,
 451                 .selector       = PU_HUE_AUTO_CONTROL,
 452                 .size           = 1,
 453                 .offset         = 0,
 454                 .v4l2_type      = V4L2_CTRL_TYPE_BOOLEAN,
 455                 .data_type      = UVC_CTRL_DATA_TYPE_BOOLEAN,
 456         },
 457         {
 458                 .id             = V4L2_CID_EXPOSURE_AUTO,
 459                 .name           = "Exposure, Auto",
 460                 .entity         = UVC_GUID_UVC_CAMERA,
 461                 .selector       = CT_AE_MODE_CONTROL,
 462                 .size           = 4,
 463                 .offset         = 0,
 464                 .v4l2_type      = V4L2_CTRL_TYPE_MENU,
 465                 .data_type      = UVC_CTRL_DATA_TYPE_BITMASK,
 466                 .menu_info      = exposure_auto_controls,
 467                 .menu_count     = ARRAY_SIZE(exposure_auto_controls),
 468         },
 469         {
 470                 .id             = V4L2_CID_EXPOSURE_AUTO_PRIORITY,
 471                 .name           = "Exposure, Auto Priority",
 472                 .entity         = UVC_GUID_UVC_CAMERA,
 473                 .selector       = CT_AE_PRIORITY_CONTROL,
 474                 .size           = 1,
 475                 .offset         = 0,
 476                 .v4l2_type      = V4L2_CTRL_TYPE_BOOLEAN,
 477                 .data_type      = UVC_CTRL_DATA_TYPE_BOOLEAN,
 478         },
 479         {
 480                 .id             = V4L2_CID_EXPOSURE_ABSOLUTE,
 481                 .name           = "Exposure (Absolute)",
 482                 .entity         = UVC_GUID_UVC_CAMERA,
 483                 .selector       = CT_EXPOSURE_TIME_ABSOLUTE_CONTROL,
 484                 .size           = 32,
 485                 .offset         = 0,
 486                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 487                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 488         },
 489         {
 490                 .id             = V4L2_CID_AUTO_WHITE_BALANCE,
 491                 .name           = "White Balance Temperature, Auto",
 492                 .entity         = UVC_GUID_UVC_PROCESSING,
 493                 .selector       = PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL,
 494                 .size           = 1,
 495                 .offset         = 0,
 496                 .v4l2_type      = V4L2_CTRL_TYPE_BOOLEAN,
 497                 .data_type      = UVC_CTRL_DATA_TYPE_BOOLEAN,
 498         },
 499         {
 500                 .id             = V4L2_CID_WHITE_BALANCE_TEMPERATURE,
 501                 .name           = "White Balance Temperature",
 502                 .entity         = UVC_GUID_UVC_PROCESSING,
 503                 .selector       = PU_WHITE_BALANCE_TEMPERATURE_CONTROL,
 504                 .size           = 16,
 505                 .offset         = 0,
 506                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 507                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 508         },
 509         {
 510                 .id             = V4L2_CID_AUTO_WHITE_BALANCE,
 511                 .name           = "White Balance Component, Auto",
 512                 .entity         = UVC_GUID_UVC_PROCESSING,
 513                 .selector       = PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL,
 514                 .size           = 1,
 515                 .offset         = 0,
 516                 .v4l2_type      = V4L2_CTRL_TYPE_BOOLEAN,
 517                 .data_type      = UVC_CTRL_DATA_TYPE_BOOLEAN,
 518         },
 519         {
 520                 .id             = V4L2_CID_BLUE_BALANCE,
 521                 .name           = "White Balance Blue Component",
 522                 .entity         = UVC_GUID_UVC_PROCESSING,
 523                 .selector       = PU_WHITE_BALANCE_COMPONENT_CONTROL,
 524                 .size           = 16,
 525                 .offset         = 0,
 526                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 527                 .data_type      = UVC_CTRL_DATA_TYPE_SIGNED,
 528         },
 529         {
 530                 .id             = V4L2_CID_RED_BALANCE,
 531                 .name           = "White Balance Red Component",
 532                 .entity         = UVC_GUID_UVC_PROCESSING,
 533                 .selector       = PU_WHITE_BALANCE_COMPONENT_CONTROL,
 534                 .size           = 16,
 535                 .offset         = 16,
 536                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 537                 .data_type      = UVC_CTRL_DATA_TYPE_SIGNED,
 538         },
 539         {
 540                 .id             = V4L2_CID_FOCUS_ABSOLUTE,
 541                 .name           = "Focus (absolute)",
 542                 .entity         = UVC_GUID_UVC_CAMERA,
 543                 .selector       = CT_FOCUS_ABSOLUTE_CONTROL,
 544                 .size           = 16,
 545                 .offset         = 0,
 546                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 547                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 548         },
 549         {
 550                 .id             = V4L2_CID_FOCUS_AUTO,
 551                 .name           = "Focus, Auto",
 552                 .entity         = UVC_GUID_UVC_CAMERA,
 553                 .selector       = CT_FOCUS_AUTO_CONTROL,
 554                 .size           = 1,
 555                 .offset         = 0,
 556                 .v4l2_type      = V4L2_CTRL_TYPE_BOOLEAN,
 557                 .data_type      = UVC_CTRL_DATA_TYPE_BOOLEAN,
 558         },
 559         {
 560                 .id             = V4L2_CID_ZOOM_ABSOLUTE,
 561                 .name           = "Zoom, Absolute",
 562                 .entity         = UVC_GUID_UVC_CAMERA,
 563                 .selector       = CT_ZOOM_ABSOLUTE_CONTROL,
 564                 .size           = 16,
 565                 .offset         = 0,
 566                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 567                 .data_type      = UVC_CTRL_DATA_TYPE_UNSIGNED,
 568         },
 569         {
 570                 .id             = V4L2_CID_ZOOM_CONTINUOUS,
 571                 .name           = "Zoom, Continuous",
 572                 .entity         = UVC_GUID_UVC_CAMERA,
 573                 .selector       = CT_ZOOM_RELATIVE_CONTROL,
 574                 .size           = 0,
 575                 .offset         = 0,
 576                 .v4l2_type      = V4L2_CTRL_TYPE_INTEGER,
 577                 .data_type      = UVC_CTRL_DATA_TYPE_SIGNED,
 578                 .get            = uvc_ctrl_get_zoom,
 579                 .set            = uvc_ctrl_set_zoom,
 580         },
 581         {
 582                 .id             = V4L2_CID_PRIVACY,
 583                 .name           = "Privacy",
 584                 .entity         = UVC_GUID_UVC_CAMERA,
 585                 .selector       = CT_PRIVACY_CONTROL,
 586                 .size           = 1,
 587                 .offset         = 0,
 588                 .v4l2_type      = V4L2_CTRL_TYPE_BOOLEAN,
 589                 .data_type      = UVC_CTRL_DATA_TYPE_BOOLEAN,
 590         },
 591 };
 592
 593 /* ------------------------------------------------------------------------
 594  * Utility functions
 595  */
 596
 597 static inline __u8 *uvc_ctrl_data(struct uvc_control *ctrl, int id)
 598 {
 599         return ctrl->data + id * ctrl->info->size;
 600 }
 601
 602 static inline int uvc_test_bit(const __u8 *data, int bit)
 603 {
 604         return (data[bit >> 3] >> (bit & 7)) & 1;
 605 }
 606
 607 static inline void uvc_clear_bit(__u8 *data, int bit)
 608 {
 609         data[bit >> 3] &= ~(1 << (bit & 7));
 610 }
 611
 612 /* Extract the bit string specified by mapping->offset and mapping->size
 613  * from the little-endian data stored at 'data' and return the result as
 614  * a signed 32bit integer. Sign extension will be performed if the mapping
 615  * references a signed data type.
 616  */
 617 static __s32 uvc_get_le_value(struct uvc_control_mapping *mapping,
 618         __u8 query, const __u8 *data)
 619 {
 620         int bits = mapping->size;
 621         int offset = mapping->offset;
 622         __s32 value = 0;
 623         __u8 mask;
 624
 625         data += offset / 8;
 626         offset &= 7;
 627         mask = ((1LL << bits) - 1) << offset;
 628
 629         for (; bits > 0; data++) {
 630                 __u8 byte = *data & mask;
 631                 value |= offset > 0 ? (byte >> offset) : (byte << (-offset));
 632                 bits -= 8 - (offset > 0 ? offset : 0);
 633                 offset -= 8;
 634                 mask = (1 << bits) - 1;
 635         }
 636
 637         /* Sign-extend the value if needed. */
 638         if (mapping->data_type == UVC_CTRL_DATA_TYPE_SIGNED)
 639                 value |= -(value & (1 << (mapping->size - 1)));
 640
 641         return value;
 642 }
 643
 644 /* Set the bit string specified by mapping->offset and mapping->size
 645  * in the little-endian data stored at 'data' to the value 'value'.
 646  */
 647 static void uvc_set_le_value(struct uvc_control_mapping *mapping,
 648         __s32 value, __u8 *data)
 649 {
 650         int bits = mapping->size;
 651         int offset = mapping->offset;
 652         __u8 mask;
 653
 654         data += offset / 8;
 655         offset &= 7;
 656
 657         for (; bits > 0; data++) {
 658                 mask = ((1LL << bits) - 1) << offset;
 659                 *data = (*data & ~mask) | ((value << offset) & mask);
 660                 value >>= offset ? offset : 8;
 661                 bits -= 8 - offset;
 662                 offset = 0;
 663         }
 664 }
 665
 666 /* ------------------------------------------------------------------------
 667  * Terminal and unit management
 668  */
 669
 670 static const __u8 uvc_processing_guid[16] = UVC_GUID_UVC_PROCESSING;
 671 static const __u8 uvc_camera_guid[16] = UVC_GUID_UVC_CAMERA;
 672 static const __u8 uvc_media_transport_input_guid[16] =
 673         UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT;
 674
 675 static int uvc_entity_match_guid(struct uvc_entity *entity, __u8 guid[16])
 676 {
 677         switch (UVC_ENTITY_TYPE(entity)) {
 678         case ITT_CAMERA:
 679                 return memcmp(uvc_camera_guid, guid, 16) == 0;
 680
 681         case ITT_MEDIA_TRANSPORT_INPUT:
 682                 return memcmp(uvc_media_transport_input_guid, guid, 16) == 0;
 683
 684         case VC_PROCESSING_UNIT:
 685                 return memcmp(uvc_processing_guid, guid, 16) == 0;
 686
 687         case VC_EXTENSION_UNIT:
 688                 return memcmp(entity->extension.guidExtensionCode,
 689                               guid, 16) == 0;
 690
 691         default:
 692                 return 0;
 693         }
 694 }
 695
 696 /* ------------------------------------------------------------------------
 697  * UVC Controls
 698  */
 699
 700 static void __uvc_find_control(struct uvc_entity *entity, __u32 v4l2_id,
 701         struct uvc_control_mapping **mapping, struct uvc_control **control,
 702         int next)
 703 {
 704         struct uvc_control *ctrl;
 705         struct uvc_control_mapping *map;
 706         unsigned int i;
 707
 708         if (entity == NULL)
 709                 return;
 710
 711         for (i = 0; i < entity->ncontrols; ++i) {
 712                 ctrl = &entity->controls[i];
 713                 if (ctrl->info == NULL)
 714                         continue;
 715
 716                 list_for_each_entry(map, &ctrl->info->mappings, list) {
 717                         if ((map->id == v4l2_id) && !next) {
 718                                 *control = ctrl;
 719                                 *mapping = map;
 720                                 return;
 721                         }
 722
 723                         if ((*mapping == NULL || (*mapping)->id > map->id) &&
 724                             (map->id > v4l2_id) && next) {
 725                                 *control = ctrl;
 726                                 *mapping = map;
 727                         }
 728                 }
 729         }
 730 }
 731
 732 struct uvc_control *uvc_find_control(struct uvc_video_device *video,
 733         __u32 v4l2_id, struct uvc_control_mapping **mapping)
 734 {
 735         struct uvc_control *ctrl = NULL;
 736         struct uvc_entity *entity;
 737         int next = v4l2_id & V4L2_CTRL_FLAG_NEXT_CTRL;
 738
 739         *mapping = NULL;
 740
 741         /* Mask the query flags. */
 742         v4l2_id &= V4L2_CTRL_ID_MASK;
 743
 744         /* Find the control. */
 745         __uvc_find_control(video->processing, v4l2_id, mapping, &ctrl, next);
 746         if (ctrl && !next)
 747                 return ctrl;
 748
 749         list_for_each_entry(entity, &video->iterms, chain) {
 750                 __uvc_find_control(entity, v4l2_id, mapping, &ctrl, next);
 751                 if (ctrl && !next)
 752                         return ctrl;
 753         }
 754
 755         list_for_each_entry(entity, &video->extensions, chain) {
 756                 __uvc_find_control(entity, v4l2_id, mapping, &ctrl, next);
 757                 if (ctrl && !next)
 758                         return ctrl;
 759         }
 760
 761         if (ctrl == NULL && !next)
 762                 uvc_trace(UVC_TRACE_CONTROL, "Control 0x%08x not found.\n",
 763                                 v4l2_id);
 764
 765         return ctrl;
 766 }
 767
 768 int uvc_query_v4l2_ctrl(struct uvc_video_device *video,
 769         struct v4l2_queryctrl *v4l2_ctrl)
 770 {
 771         struct uvc_control *ctrl;
 772         struct uvc_control_mapping *mapping;
 773         struct uvc_menu_info *menu;
 774         unsigned int i;
 775         __u8 *data;
 776         int ret;
 777
 778         ctrl = uvc_find_control(video, v4l2_ctrl->id, &mapping);
 779         if (ctrl == NULL)
 780                 return -EINVAL;
 781
 782         data = kmalloc(ctrl->info->size, GFP_KERNEL);
 783         if (data == NULL)
 784                 return -ENOMEM;
 785
 786         memset(v4l2_ctrl, 0, sizeof *v4l2_ctrl);
 787         v4l2_ctrl->id = mapping->id;
 788         v4l2_ctrl->type = mapping->v4l2_type;
 789         strncpy(v4l2_ctrl->name, mapping->name, sizeof v4l2_ctrl->name);
 790         v4l2_ctrl->flags = 0;
 791
 792         if (!(ctrl->info->flags & UVC_CONTROL_SET_CUR))
 793                 v4l2_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
 794
 795         if (ctrl->info->flags & UVC_CONTROL_GET_DEF) {
 796                 if ((ret = uvc_query_ctrl(video->dev, GET_DEF, ctrl->entity->id,
 797                                 video->dev->intfnum, ctrl->info->selector,
 798                                 data, ctrl->info->size)) < 0)
 799                         goto out;
 800                 v4l2_ctrl->default_value = mapping->get(mapping, GET_DEF, data);
 801         }
 802
 803         switch (mapping->v4l2_type) {
 804         case V4L2_CTRL_TYPE_MENU:
 805                 v4l2_ctrl->minimum = 0;
 806                 v4l2_ctrl->maximum = mapping->menu_count - 1;
 807                 v4l2_ctrl->step = 1;
 808
 809                 menu = mapping->menu_info;
 810                 for (i = 0; i < mapping->menu_count; ++i, ++menu) {
 811                         if (menu->value == v4l2_ctrl->default_value) {
 812                                 v4l2_ctrl->default_value = i;
 813                                 break;
 814                         }
 815                 }
 816
 817                 ret = 0;
 818                 goto out;
 819
 820         case V4L2_CTRL_TYPE_BOOLEAN:
 821                 v4l2_ctrl->minimum = 0;
 822                 v4l2_ctrl->maximum = 1;
 823                 v4l2_ctrl->step = 1;
 824                 ret = 0;
 825                 goto out;
 826
 827         default:
 828                 break;
 829         }
 830
 831         if (ctrl->info->flags & UVC_CONTROL_GET_MIN) {
 832                 if ((ret = uvc_query_ctrl(video->dev, GET_MIN, ctrl->entity->id,
 833                                 video->dev->intfnum, ctrl->info->selector,
 834                                 data, ctrl->info->size)) < 0)
 835                         goto out;
 836                 v4l2_ctrl->minimum = mapping->get(mapping, GET_MIN, data);
 837         }
 838         if (ctrl->info->flags & UVC_CONTROL_GET_MAX) {
 839                 if ((ret = uvc_query_ctrl(video->dev, GET_MAX, ctrl->entity->id,
 840                                 video->dev->intfnum, ctrl->info->selector,
 841                                 data, ctrl->info->size)) < 0)
 842                         goto out;
 843                 v4l2_ctrl->maximum = mapping->get(mapping, GET_MAX, data);
 844         }
 845         if (ctrl->info->flags & UVC_CONTROL_GET_RES) {
 846                 if ((ret = uvc_query_ctrl(video->dev, GET_RES, ctrl->entity->id,
 847                                 video->dev->intfnum, ctrl->info->selector,
 848                                 data, ctrl->info->size)) < 0)
 849                         goto out;
 850                 v4l2_ctrl->step = mapping->get(mapping, GET_RES, data);
 851         }
 852
 853         ret = 0;
 854 out:
 855         kfree(data);
 856         return ret;
 857 }
 858
 859
 860 /* --------------------------------------------------------------------------
 861  * Control transactions
 862  *
 863  * To make extended set operations as atomic as the hardware allows, controls
 864  * are handled using begin/commit/rollback operations.
 865  *
 866  * At the beginning of a set request, uvc_ctrl_begin should be called to
 867  * initialize the request. This function acquires the control lock.
 868  *
 869  * When setting a control, the new value is stored in the control data field
 870  * at position UVC_CTRL_DATA_CURRENT. The control is then marked as dirty for
 871  * later processing. If the UVC and V4L2 control sizes differ, the current
 872  * value is loaded from the hardware before storing the new value in the data
 873  * field.
 874  *
 875  * After processing all controls in the transaction, uvc_ctrl_commit or
 876  * uvc_ctrl_rollback must be called to apply the pending changes to the
 877  * hardware or revert them. When applying changes, all controls marked as
 878  * dirty will be modified in the UVC device, and the dirty flag will be
 879  * cleared. When reverting controls, the control data field
 880  * UVC_CTRL_DATA_CURRENT is reverted to its previous value
 881  * (UVC_CTRL_DATA_BACKUP) for all dirty controls. Both functions release the
 882  * control lock.
 883  */
 884 int uvc_ctrl_begin(struct uvc_video_device *video)
 885 {
 886         return mutex_lock_interruptible(&video->ctrl_mutex) ? -ERESTARTSYS : 0;
 887 }
 888
 889 static int uvc_ctrl_commit_entity(struct uvc_device *dev,
 890         struct uvc_entity *entity, int rollback)
 891 {
 892         struct uvc_control *ctrl;
 893         unsigned int i;
 894         int ret;
 895
 896         if (entity == NULL)
 897                 return 0;
 898
 899         for (i = 0; i < entity->ncontrols; ++i) {
 900                 ctrl = &entity->controls[i];
 901                 if (ctrl->info == NULL)
 902                         continue;
 903
 904                 /* Reset the loaded flag for auto-update controls that were
 905                  * marked as loaded in uvc_ctrl_get/uvc_ctrl_set to prevent
 906                  * uvc_ctrl_get from using the cached value.
 907                  */
 908                 if (ctrl->info->flags & UVC_CONTROL_AUTO_UPDATE)
 909                         ctrl->loaded = 0;
 910
 911                 if (!ctrl->dirty)
 912                         continue;
 913
 914                 if (!rollback)
 915                         ret = uvc_query_ctrl(dev, SET_CUR, ctrl->entity->id,
 916                                 dev->intfnum, ctrl->info->selector,
 917                                 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
 918                                 ctrl->info->size);
 919                 else
 920                         ret = 0;
 921
 922                 if (rollback || ret < 0)
 923                         memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
 924                                uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
 925                                ctrl->info->size);
 926
 927                 ctrl->dirty = 0;
 928
 929                 if (ret < 0)
 930                         return ret;
 931         }
 932
 933         return 0;
 934 }
 935
 936 int __uvc_ctrl_commit(struct uvc_video_device *video, int rollback)
 937 {
 938         struct uvc_entity *entity;
 939         int ret = 0;
 940
 941         /* Find the control. */
 942         ret = uvc_ctrl_commit_entity(video->dev, video->processing, rollback);
 943         if (ret < 0)
 944                 goto done;
 945
 946         list_for_each_entry(entity, &video->iterms, chain) {
 947                 ret = uvc_ctrl_commit_entity(video->dev, entity, rollback);
 948                 if (ret < 0)
 949                         goto done;
 950         }
 951
 952         list_for_each_entry(entity, &video->extensions, chain) {
 953                 ret = uvc_ctrl_commit_entity(video->dev, entity, rollback);
 954                 if (ret < 0)
 955                         goto done;
 956         }
 957
 958 done:
 959         mutex_unlock(&video->ctrl_mutex);
 960         return ret;
 961 }
 962
 963 int uvc_ctrl_get(struct uvc_video_device *video,
 964         struct v4l2_ext_control *xctrl)
 965 {
 966         struct uvc_control *ctrl;
 967         struct uvc_control_mapping *mapping;
 968         struct uvc_menu_info *menu;
 969         unsigned int i;
 970         int ret;
 971
 972         ctrl = uvc_find_control(video, xctrl->id, &mapping);
 973         if (ctrl == NULL || (ctrl->info->flags & UVC_CONTROL_GET_CUR) == 0)
 974                 return -EINVAL;
 975
 976         if (!ctrl->loaded) {
 977                 ret = uvc_query_ctrl(video->dev, GET_CUR, ctrl->entity->id,
 978                                 video->dev->intfnum, ctrl->info->selector,
 979                                 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
 980                                 ctrl->info->size);
 981                 if (ret < 0)
 982                         return ret;
 983
 984                 ctrl->loaded = 1;
 985         }
 986
 987         xctrl->value = mapping->get(mapping, GET_CUR,
 988                 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT));
 989
 990         if (mapping->v4l2_type == V4L2_CTRL_TYPE_MENU) {
 991                 menu = mapping->menu_info;
 992                 for (i = 0; i < mapping->menu_count; ++i, ++menu) {
 993                         if (menu->value == xctrl->value) {
 994                                 xctrl->value = i;
 995                                 break;
 996                         }
 997                 }
 998         }
 999
1000         return 0;
1001 }
1002
1003 int uvc_ctrl_set(struct uvc_video_device *video,
1004         struct v4l2_ext_control *xctrl)
1005 {
1006         struct uvc_control *ctrl;
1007         struct uvc_control_mapping *mapping;
1008         s32 value = xctrl->value;
1009         int ret;
1010
1011         ctrl = uvc_find_control(video, xctrl->id, &mapping);
1012         if (ctrl == NULL || (ctrl->info->flags & UVC_CONTROL_SET_CUR) == 0)
1013                 return -EINVAL;
1014
1015         if (mapping->v4l2_type == V4L2_CTRL_TYPE_MENU) {
1016                 if (value < 0 || value >= mapping->menu_count)
1017                         return -EINVAL;
1018                 value = mapping->menu_info[value].value;
1019         }
1020
1021         if (!ctrl->loaded && (ctrl->info->size * 8) != mapping->size) {
1022                 if ((ctrl->info->flags & UVC_CONTROL_GET_CUR) == 0) {
1023                         memset(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1024                                 0, ctrl->info->size);
1025                 } else {
1026                         ret = uvc_query_ctrl(video->dev, GET_CUR,
1027                                 ctrl->entity->id, video->dev->intfnum,
1028                                 ctrl->info->selector,
1029                                 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1030                                 ctrl->info->size);
1031                         if (ret < 0)
1032                                 return ret;
1033                 }
1034
1035                 ctrl->loaded = 1;
1036         }
1037
1038         if (!ctrl->dirty) {
1039                 memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
1040                        uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1041                        ctrl->info->size);
1042         }
1043
1044         mapping->set(mapping, value,
1045                 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT));
1046
1047         ctrl->dirty = 1;
1048         ctrl->modified = 1;
1049         return 0;
1050 }
1051
1052 /* --------------------------------------------------------------------------
1053  * Dynamic controls
1054  */
1055
1056 int uvc_xu_ctrl_query(struct uvc_video_device *video,
1057         struct uvc_xu_control *xctrl, int set)
1058 {
1059         struct uvc_entity *entity;
1060         struct uvc_control *ctrl = NULL;
1061         unsigned int i, found = 0;
1062         __u8 *data;
1063         int ret;
1064
1065         /* Find the extension unit. */
1066         list_for_each_entry(entity, &video->extensions, chain) {
1067                 if (entity->id == xctrl->unit)
1068                         break;
1069         }
1070
1071         if (entity->id != xctrl->unit) {
1072                 uvc_trace(UVC_TRACE_CONTROL, "Extension unit %u not found.\n",
1073                         xctrl->unit);
1074                 return -EINVAL;
1075         }
1076
1077         /* Find the control. */
1078         for (i = 0; i < entity->ncontrols; ++i) {
1079                 ctrl = &entity->controls[i];
1080                 if (ctrl->info == NULL)
1081                         continue;
1082
1083                 if (ctrl->info->selector == xctrl->selector) {
1084                         found = 1;
1085                         break;
1086                 }
1087         }
1088
1089         if (!found) {
1090                 uvc_trace(UVC_TRACE_CONTROL,
1091                         "Control " UVC_GUID_FORMAT "/%u not found.\n",
1092                         UVC_GUID_ARGS(entity->extension.guidExtensionCode),
1093                         xctrl->selector);
1094                 return -EINVAL;
1095         }
1096
1097         /* Validate control data size. */
1098         if (ctrl->info->size != xctrl->size)
1099                 return -EINVAL;
1100
1101         if ((set && !(ctrl->info->flags & UVC_CONTROL_SET_CUR)) ||
1102             (!set && !(ctrl->info->flags & UVC_CONTROL_GET_CUR)))
1103                 return -EINVAL;
1104
1105         if (mutex_lock_interruptible(&video->ctrl_mutex))
1106                 return -ERESTARTSYS;
1107
1108         memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
1109                uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1110                xctrl->size);
1111         data = uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT);
1112
1113         if (set && copy_from_user(data, xctrl->data, xctrl->size)) {
1114                 ret = -EFAULT;
1115                 goto out;
1116         }
1117
1118         ret = uvc_query_ctrl(video->dev, set ? SET_CUR : GET_CUR, xctrl->unit,
1119                              video->dev->intfnum, xctrl->selector, data,
1120                              xctrl->size);
1121         if (ret < 0)
1122                 goto out;
1123
1124         if (!set && copy_to_user(xctrl->data, data, xctrl->size)) {
1125                 ret = -EFAULT;
1126                 goto out;
1127         }
1128
1129 out:
1130         if (ret)
1131                 memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1132                        uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
1133                        xctrl->size);
1134
1135         mutex_unlock(&video->ctrl_mutex);
1136         return ret;
1137 }
1138
1139 /* --------------------------------------------------------------------------
1140  * Suspend/resume
1141  */
1142
1143 /*
1144  * Restore control values after resume, skipping controls that haven't been
1145  * changed.
1146  *
1147  * TODO
1148  * - Don't restore modified controls that are back to their default value.
1149  * - Handle restore order (Auto-Exposure Mode should be restored before
1150  *   Exposure Time).
1151  */
1152 int uvc_ctrl_resume_device(struct uvc_device *dev)
1153 {
1154         struct uvc_control *ctrl;
1155         struct uvc_entity *entity;
1156         unsigned int i;
1157         int ret;
1158
1159         /* Walk the entities list and restore controls when possible. */
1160         list_for_each_entry(entity, &dev->entities, list) {
1161
1162                 for (i = 0; i < entity->ncontrols; ++i) {
1163                         ctrl = &entity->controls[i];
1164
1165                         if (ctrl->info == NULL || !ctrl->modified ||
1166                             (ctrl->info->flags & UVC_CONTROL_RESTORE) == 0)
1167                                 continue;
1168
1169                         printk(KERN_INFO "restoring control " UVC_GUID_FORMAT
1170                                 "/%u/%u\n", UVC_GUID_ARGS(ctrl->info->entity),
1171                                 ctrl->info->index, ctrl->info->selector);
1172                         ctrl->dirty = 1;
1173                 }
1174
1175                 ret = uvc_ctrl_commit_entity(dev, entity, 0);
1176                 if (ret < 0)
1177                         return ret;
1178         }
1179
1180         return 0;
1181 }
1182
1183 /* --------------------------------------------------------------------------
1184  * Control and mapping handling
1185  */
1186
1187 static void uvc_ctrl_add_ctrl(struct uvc_device *dev,
1188         struct uvc_control_info *info)
1189 {
1190         struct uvc_entity *entity;
1191         struct uvc_control *ctrl = NULL;
1192         int ret, found = 0;
1193         unsigned int i;
1194
1195         list_for_each_entry(entity, &dev->entities, list) {
1196                 if (!uvc_entity_match_guid(entity, info->entity))
1197                         continue;
1198
1199                 for (i = 0; i < entity->ncontrols; ++i) {
1200                         ctrl = &entity->controls[i];
1201                         if (ctrl->index == info->index) {
1202                                 found = 1;
1203                                 break;
1204                         }
1205                 }
1206
1207                 if (found)
1208                         break;
1209         }
1210
1211         if (!found)
1212                 return;
1213
1214         if (UVC_ENTITY_TYPE(entity) == VC_EXTENSION_UNIT) {
1215                 /* Check if the device control information and length match
1216                  * the user supplied information.
1217                  */
1218                 __u32 flags;
1219                 __le16 size;
1220                 __u8 inf;
1221
1222                 if ((ret = uvc_query_ctrl(dev, GET_LEN, ctrl->entity->id,
1223                         dev->intfnum, info->selector, (__u8 *)&size, 2)) < 0) {
1224                         uvc_trace(UVC_TRACE_CONTROL, "GET_LEN failed on "
1225                                 "control " UVC_GUID_FORMAT "/%u (%d).\n",
1226                                 UVC_GUID_ARGS(info->entity), info->selector,
1227                                 ret);
1228                         return;
1229                 }
1230
1231                 if (info->size != le16_to_cpu(size)) {
1232                         uvc_trace(UVC_TRACE_CONTROL, "Control " UVC_GUID_FORMAT
1233                                 "/%u size doesn't match user supplied "
1234                                 "value.\n", UVC_GUID_ARGS(info->entity),
1235                                 info->selector);
1236                         return;
1237                 }
1238
1239                 if ((ret = uvc_query_ctrl(dev, GET_INFO, ctrl->entity->id,
1240                         dev->intfnum, info->selector, &inf, 1)) < 0) {
1241                         uvc_trace(UVC_TRACE_CONTROL, "GET_INFO failed on "
1242                                 "control " UVC_GUID_FORMAT "/%u (%d).\n",
1243                                 UVC_GUID_ARGS(info->entity), info->selector,
1244                                 ret);
1245                         return;
1246                 }
1247
1248                 flags = info->flags;
1249                 if (((flags & UVC_CONTROL_GET_CUR) && !(inf & (1 << 0))) ||
1250                     ((flags & UVC_CONTROL_SET_CUR) && !(inf & (1 << 1)))) {
1251                         uvc_trace(UVC_TRACE_CONTROL, "Control "
1252                                 UVC_GUID_FORMAT "/%u flags don't match "
1253                                 "supported operations.\n",
1254                                 UVC_GUID_ARGS(info->entity), info->selector);
1255                         return;
1256                 }
1257         }
1258
1259         ctrl->info = info;
1260         ctrl->data = kmalloc(ctrl->info->size * UVC_CTRL_NDATA, GFP_KERNEL);
1261         uvc_trace(UVC_TRACE_CONTROL, "Added control " UVC_GUID_FORMAT "/%u "
1262                 "to device %s entity %u\n", UVC_GUID_ARGS(ctrl->info->entity),
1263                 ctrl->info->selector, dev->udev->devpath, entity->id);
1264 }
1265
1266 /*
1267  * Add an item to the UVC control information list, and instantiate a control
1268  * structure for each device that supports the control.
1269  */
1270 int uvc_ctrl_add_info(struct uvc_control_info *info)
1271 {
1272         struct uvc_control_info *ctrl;
1273         struct uvc_device *dev;
1274         int ret = 0;
1275
1276         /* Find matching controls by walking the devices, entities and
1277          * controls list.
1278          */
1279         mutex_lock(&uvc_driver.ctrl_mutex);
1280
1281         /* First check if the list contains a control matching the new one.
1282          * Bail out if it does.
1283          */
1284         list_for_each_entry(ctrl, &uvc_driver.controls, list) {
1285                 if (memcmp(ctrl->entity, info->entity, 16))
1286                         continue;
1287
1288                 if (ctrl->selector == info->selector) {
1289                         uvc_trace(UVC_TRACE_CONTROL, "Control "
1290                                 UVC_GUID_FORMAT "/%u is already defined.\n",
1291                                 UVC_GUID_ARGS(info->entity), info->selector);
1292                         ret = -EEXIST;
1293                         goto end;
1294                 }
1295                 if (ctrl->index == info->index) {
1296                         uvc_trace(UVC_TRACE_CONTROL, "Control "
1297                                 UVC_GUID_FORMAT "/%u would overwrite index "
1298                                 "%d.\n", UVC_GUID_ARGS(info->entity),
1299                                 info->selector, info->index);
1300                         ret = -EEXIST;
1301                         goto end;
1302                 }
1303         }
1304
1305         list_for_each_entry(dev, &uvc_driver.devices, list)
1306                 uvc_ctrl_add_ctrl(dev, info);
1307
1308         INIT_LIST_HEAD(&info->mappings);
1309         list_add_tail(&info->list, &uvc_driver.controls);
1310 end:
1311         mutex_unlock(&uvc_driver.ctrl_mutex);
1312         return ret;
1313 }
1314
1315 int uvc_ctrl_add_mapping(struct uvc_control_mapping *mapping)
1316 {
1317         struct uvc_control_info *info;
1318         struct uvc_control_mapping *map;
1319         int ret = -EINVAL;
1320
1321         if (mapping->get == NULL)
1322                 mapping->get = uvc_get_le_value;
1323         if (mapping->set == NULL)
1324                 mapping->set = uvc_set_le_value;
1325
1326         if (mapping->id & ~V4L2_CTRL_ID_MASK) {
1327                 uvc_trace(UVC_TRACE_CONTROL, "Can't add mapping '%s' with "
1328                         "invalid control id 0x%08x\n", mapping->name,
1329                         mapping->id);
1330                 return -EINVAL;
1331         }
1332
1333         mutex_lock(&uvc_driver.ctrl_mutex);
1334         list_for_each_entry(info, &uvc_driver.controls, list) {
1335                 if (memcmp(info->entity, mapping->entity, 16) ||
1336                         info->selector != mapping->selector)
1337                         continue;
1338
1339                 if (info->size * 8 < mapping->size + mapping->offset) {
1340                         uvc_trace(UVC_TRACE_CONTROL, "Mapping '%s' would "
1341                                 "overflow control " UVC_GUID_FORMAT "/%u\n",
1342                                 mapping->name, UVC_GUID_ARGS(info->entity),
1343                                 info->selector);
1344                         ret = -EOVERFLOW;
1345                         goto end;
1346                 }
1347
1348                 /* Check if the list contains a mapping matching the new one.
1349                  * Bail out if it does.
1350                  */
1351                 list_for_each_entry(map, &info->mappings, list) {
1352                         if (map->id == mapping->id) {
1353                                 uvc_trace(UVC_TRACE_CONTROL, "Mapping '%s' is "
1354                                         "already defined.\n", mapping->name);
1355                                 ret = -EEXIST;
1356                                 goto end;
1357                         }
1358                 }
1359
1360                 mapping->ctrl = info;
1361                 list_add_tail(&mapping->list, &info->mappings);
1362                 uvc_trace(UVC_TRACE_CONTROL, "Adding mapping %s to control "
1363                         UVC_GUID_FORMAT "/%u.\n", mapping->name,
1364                         UVC_GUID_ARGS(info->entity), info->selector);
1365
1366                 ret = 0;
1367                 break;
1368         }
1369 end:
1370         mutex_unlock(&uvc_driver.ctrl_mutex);
1371         return ret;
1372 }
1373
1374 /*
1375  * Prune an entity of its bogus controls. This currently includes processing
1376  * unit auto controls for which no corresponding manual control is available.
1377  * Such auto controls make little sense if any, and are known to crash at
1378  * least the SiGma Micro webcam.
1379  */
1380 static void
1381 uvc_ctrl_prune_entity(struct uvc_entity *entity)
1382 {
1383         static const struct {
1384                 u8 idx_manual;
1385                 u8 idx_auto;
1386         } blacklist[] = {
1387                 { 2, 11 }, /* Hue */
1388                 { 6, 12 }, /* White Balance Temperature */
1389                 { 7, 13 }, /* White Balance Component */
1390         };
1391
1392         u8 *controls;
1393         unsigned int size;
1394         unsigned int i;
1395
1396         if (UVC_ENTITY_TYPE(entity) != VC_PROCESSING_UNIT)
1397                 return;
1398
1399         controls = entity->processing.bmControls;
1400         size = entity->processing.bControlSize;
1401
1402         for (i = 0; i < ARRAY_SIZE(blacklist); ++i) {
1403                 if (blacklist[i].idx_auto >= 8 * size ||
1404                     blacklist[i].idx_manual >= 8 * size)
1405                         continue;
1406
1407                 if (!uvc_test_bit(controls, blacklist[i].idx_auto) ||
1408                      uvc_test_bit(controls, blacklist[i].idx_manual))
1409                         continue;
1410
1411                 uvc_trace(UVC_TRACE_CONTROL, "Auto control %u/%u has no "
1412                         "matching manual control, removing it.\n", entity->id,
1413                         blacklist[i].idx_auto);
1414
1415                 uvc_clear_bit(controls, blacklist[i].idx_auto);
1416         }
1417 }
1418
1419 /*
1420  * Initialize device controls.
1421  */
1422 int uvc_ctrl_init_device(struct uvc_device *dev)
1423 {
1424         struct uvc_control_info *info;
1425         struct uvc_control *ctrl;
1426         struct uvc_entity *entity;
1427         unsigned int i;
1428
1429         /* Walk the entities list and instantiate controls */
1430         list_for_each_entry(entity, &dev->entities, list) {
1431                 unsigned int bControlSize = 0, ncontrols = 0;
1432                 __u8 *bmControls = NULL;
1433
1434                 if (UVC_ENTITY_TYPE(entity) == VC_EXTENSION_UNIT) {
1435                         bmControls = entity->extension.bmControls;
1436                         bControlSize = entity->extension.bControlSize;
1437                 } else if (UVC_ENTITY_TYPE(entity) == VC_PROCESSING_UNIT) {
1438                         bmControls = entity->processing.bmControls;
1439                         bControlSize = entity->processing.bControlSize;
1440                 } else if (UVC_ENTITY_TYPE(entity) == ITT_CAMERA) {
1441                         bmControls = entity->camera.bmControls;
1442                         bControlSize = entity->camera.bControlSize;
1443                 }
1444
1445                 if (dev->quirks & UVC_QUIRK_PRUNE_CONTROLS)
1446                         uvc_ctrl_prune_entity(entity);
1447
1448                 for (i = 0; i < bControlSize; ++i)
1449                         ncontrols += hweight8(bmControls[i]);
1450
1451                 if (ncontrols == 0)
1452                         continue;
1453
1454                 entity->controls = kzalloc(ncontrols*sizeof *ctrl, GFP_KERNEL);
1455                 if (entity->controls == NULL)
1456                         return -ENOMEM;
1457
1458                 entity->ncontrols = ncontrols;
1459
1460                 ctrl = entity->controls;
1461                 for (i = 0; i < bControlSize * 8; ++i) {
1462                         if (uvc_test_bit(bmControls, i) == 0)
1463                                 continue;
1464
1465                         ctrl->entity = entity;
1466                         ctrl->index = i;
1467                         ctrl++;
1468                 }
1469         }
1470
1471         /* Walk the controls info list and associate them with the device
1472          * controls, then add the device to the global device list. This has
1473          * to be done while holding the controls lock, to make sure
1474          * uvc_ctrl_add_info() will not get called in-between.
1475          */
1476         mutex_lock(&uvc_driver.ctrl_mutex);
1477         list_for_each_entry(info, &uvc_driver.controls, list)
1478                 uvc_ctrl_add_ctrl(dev, info);
1479
1480         list_add_tail(&dev->list, &uvc_driver.devices);
1481         mutex_unlock(&uvc_driver.ctrl_mutex);
1482
1483         return 0;
1484 }
1485
1486 /*
1487  * Cleanup device controls.
1488  */
1489 void uvc_ctrl_cleanup_device(struct uvc_device *dev)
1490 {
1491         struct uvc_entity *entity;
1492         unsigned int i;
1493
1494         /* Remove the device from the global devices list */
1495         mutex_lock(&uvc_driver.ctrl_mutex);
1496         if (dev->list.next != NULL)
1497                 list_del(&dev->list);
1498         mutex_unlock(&uvc_driver.ctrl_mutex);
1499
1500         list_for_each_entry(entity, &dev->entities, list) {
1501                 for (i = 0; i < entity->ncontrols; ++i)
1502                         kfree(entity->controls[i].data);
1503
1504                 kfree(entity->controls);
1505         }
1506 }
1507
1508 void uvc_ctrl_init(void)
1509 {
1510         struct uvc_control_info *ctrl = uvc_ctrls;
1511         struct uvc_control_info *cend = ctrl + ARRAY_SIZE(uvc_ctrls);
1512         struct uvc_control_mapping *mapping = uvc_ctrl_mappings;
1513         struct uvc_control_mapping *mend =
1514                 mapping + ARRAY_SIZE(uvc_ctrl_mappings);
1515
1516         for (; ctrl < cend; ++ctrl)
1517                 uvc_ctrl_add_info(ctrl);
1518
1519         for (; mapping < mend; ++mapping)
1520                 uvc_ctrl_add_mapping(mapping);
1521 }
1522