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 <linux/atomic.h> 24 #include <media/v4l2-ctrls.h> 25 26 #include "uvcvideo.h" 27 28 #define UVC_CTRL_DATA_CURRENT 0 29 #define UVC_CTRL_DATA_BACKUP 1 30 #define UVC_CTRL_DATA_MIN 2 31 #define UVC_CTRL_DATA_MAX 3 32 #define UVC_CTRL_DATA_RES 4 33 #define UVC_CTRL_DATA_DEF 5 34 #define UVC_CTRL_DATA_LAST 6 35 36 /* ------------------------------------------------------------------------ 37 * Controls 38 */ 39 40 static struct uvc_control_info uvc_ctrls[] = { 41 { 42 .entity = UVC_GUID_UVC_PROCESSING, 43 .selector = UVC_PU_BRIGHTNESS_CONTROL, 44 .index = 0, 45 .size = 2, 46 .flags = UVC_CTRL_FLAG_SET_CUR 47 | UVC_CTRL_FLAG_GET_RANGE 48 | UVC_CTRL_FLAG_RESTORE, 49 }, 50 { 51 .entity = UVC_GUID_UVC_PROCESSING, 52 .selector = UVC_PU_CONTRAST_CONTROL, 53 .index = 1, 54 .size = 2, 55 .flags = UVC_CTRL_FLAG_SET_CUR 56 | UVC_CTRL_FLAG_GET_RANGE 57 | UVC_CTRL_FLAG_RESTORE, 58 }, 59 { 60 .entity = UVC_GUID_UVC_PROCESSING, 61 .selector = UVC_PU_HUE_CONTROL, 62 .index = 2, 63 .size = 2, 64 .flags = UVC_CTRL_FLAG_SET_CUR 65 | UVC_CTRL_FLAG_GET_RANGE 66 | UVC_CTRL_FLAG_RESTORE 67 | UVC_CTRL_FLAG_AUTO_UPDATE, 68 }, 69 { 70 .entity = UVC_GUID_UVC_PROCESSING, 71 .selector = UVC_PU_SATURATION_CONTROL, 72 .index = 3, 73 .size = 2, 74 .flags = UVC_CTRL_FLAG_SET_CUR 75 | UVC_CTRL_FLAG_GET_RANGE 76 | UVC_CTRL_FLAG_RESTORE, 77 }, 78 { 79 .entity = UVC_GUID_UVC_PROCESSING, 80 .selector = UVC_PU_SHARPNESS_CONTROL, 81 .index = 4, 82 .size = 2, 83 .flags = UVC_CTRL_FLAG_SET_CUR 84 | UVC_CTRL_FLAG_GET_RANGE 85 | UVC_CTRL_FLAG_RESTORE, 86 }, 87 { 88 .entity = UVC_GUID_UVC_PROCESSING, 89 .selector = UVC_PU_GAMMA_CONTROL, 90 .index = 5, 91 .size = 2, 92 .flags = UVC_CTRL_FLAG_SET_CUR 93 | UVC_CTRL_FLAG_GET_RANGE 94 | UVC_CTRL_FLAG_RESTORE, 95 }, 96 { 97 .entity = UVC_GUID_UVC_PROCESSING, 98 .selector = UVC_PU_WHITE_BALANCE_TEMPERATURE_CONTROL, 99 .index = 6, 100 .size = 2, 101 .flags = UVC_CTRL_FLAG_SET_CUR 102 | UVC_CTRL_FLAG_GET_RANGE 103 | UVC_CTRL_FLAG_RESTORE 104 | UVC_CTRL_FLAG_AUTO_UPDATE, 105 }, 106 { 107 .entity = UVC_GUID_UVC_PROCESSING, 108 .selector = UVC_PU_WHITE_BALANCE_COMPONENT_CONTROL, 109 .index = 7, 110 .size = 4, 111 .flags = UVC_CTRL_FLAG_SET_CUR 112 | UVC_CTRL_FLAG_GET_RANGE 113 | UVC_CTRL_FLAG_RESTORE 114 | UVC_CTRL_FLAG_AUTO_UPDATE, 115 }, 116 { 117 .entity = UVC_GUID_UVC_PROCESSING, 118 .selector = UVC_PU_BACKLIGHT_COMPENSATION_CONTROL, 119 .index = 8, 120 .size = 2, 121 .flags = UVC_CTRL_FLAG_SET_CUR 122 | UVC_CTRL_FLAG_GET_RANGE 123 | UVC_CTRL_FLAG_RESTORE, 124 }, 125 { 126 .entity = UVC_GUID_UVC_PROCESSING, 127 .selector = UVC_PU_GAIN_CONTROL, 128 .index = 9, 129 .size = 2, 130 .flags = UVC_CTRL_FLAG_SET_CUR 131 | UVC_CTRL_FLAG_GET_RANGE 132 | UVC_CTRL_FLAG_RESTORE, 133 }, 134 { 135 .entity = UVC_GUID_UVC_PROCESSING, 136 .selector = UVC_PU_POWER_LINE_FREQUENCY_CONTROL, 137 .index = 10, 138 .size = 1, 139 .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR 140 | UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_RESTORE, 141 }, 142 { 143 .entity = UVC_GUID_UVC_PROCESSING, 144 .selector = UVC_PU_HUE_AUTO_CONTROL, 145 .index = 11, 146 .size = 1, 147 .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR 148 | UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_RESTORE, 149 }, 150 { 151 .entity = UVC_GUID_UVC_PROCESSING, 152 .selector = UVC_PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL, 153 .index = 12, 154 .size = 1, 155 .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR 156 | UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_RESTORE, 157 }, 158 { 159 .entity = UVC_GUID_UVC_PROCESSING, 160 .selector = UVC_PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL, 161 .index = 13, 162 .size = 1, 163 .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR 164 | UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_RESTORE, 165 }, 166 { 167 .entity = UVC_GUID_UVC_PROCESSING, 168 .selector = UVC_PU_DIGITAL_MULTIPLIER_CONTROL, 169 .index = 14, 170 .size = 2, 171 .flags = UVC_CTRL_FLAG_SET_CUR 172 | UVC_CTRL_FLAG_GET_RANGE 173 | UVC_CTRL_FLAG_RESTORE, 174 }, 175 { 176 .entity = UVC_GUID_UVC_PROCESSING, 177 .selector = UVC_PU_DIGITAL_MULTIPLIER_LIMIT_CONTROL, 178 .index = 15, 179 .size = 2, 180 .flags = UVC_CTRL_FLAG_SET_CUR 181 | UVC_CTRL_FLAG_GET_RANGE 182 | UVC_CTRL_FLAG_RESTORE, 183 }, 184 { 185 .entity = UVC_GUID_UVC_PROCESSING, 186 .selector = UVC_PU_ANALOG_VIDEO_STANDARD_CONTROL, 187 .index = 16, 188 .size = 1, 189 .flags = UVC_CTRL_FLAG_GET_CUR, 190 }, 191 { 192 .entity = UVC_GUID_UVC_PROCESSING, 193 .selector = UVC_PU_ANALOG_LOCK_STATUS_CONTROL, 194 .index = 17, 195 .size = 1, 196 .flags = UVC_CTRL_FLAG_GET_CUR, 197 }, 198 { 199 .entity = UVC_GUID_UVC_CAMERA, 200 .selector = UVC_CT_SCANNING_MODE_CONTROL, 201 .index = 0, 202 .size = 1, 203 .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR 204 | UVC_CTRL_FLAG_RESTORE, 205 }, 206 { 207 .entity = UVC_GUID_UVC_CAMERA, 208 .selector = UVC_CT_AE_MODE_CONTROL, 209 .index = 1, 210 .size = 1, 211 .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR 212 | UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_GET_RES 213 | UVC_CTRL_FLAG_RESTORE, 214 }, 215 { 216 .entity = UVC_GUID_UVC_CAMERA, 217 .selector = UVC_CT_AE_PRIORITY_CONTROL, 218 .index = 2, 219 .size = 1, 220 .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR 221 | UVC_CTRL_FLAG_RESTORE, 222 }, 223 { 224 .entity = UVC_GUID_UVC_CAMERA, 225 .selector = UVC_CT_EXPOSURE_TIME_ABSOLUTE_CONTROL, 226 .index = 3, 227 .size = 4, 228 .flags = UVC_CTRL_FLAG_SET_CUR 229 | UVC_CTRL_FLAG_GET_RANGE 230 | UVC_CTRL_FLAG_RESTORE, 231 }, 232 { 233 .entity = UVC_GUID_UVC_CAMERA, 234 .selector = UVC_CT_EXPOSURE_TIME_RELATIVE_CONTROL, 235 .index = 4, 236 .size = 1, 237 .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_RESTORE, 238 }, 239 { 240 .entity = UVC_GUID_UVC_CAMERA, 241 .selector = UVC_CT_FOCUS_ABSOLUTE_CONTROL, 242 .index = 5, 243 .size = 2, 244 .flags = UVC_CTRL_FLAG_SET_CUR 245 | UVC_CTRL_FLAG_GET_RANGE 246 | UVC_CTRL_FLAG_RESTORE 247 | UVC_CTRL_FLAG_AUTO_UPDATE, 248 }, 249 { 250 .entity = UVC_GUID_UVC_CAMERA, 251 .selector = UVC_CT_FOCUS_RELATIVE_CONTROL, 252 .index = 6, 253 .size = 2, 254 .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_MIN 255 | UVC_CTRL_FLAG_GET_MAX | UVC_CTRL_FLAG_GET_RES 256 | UVC_CTRL_FLAG_GET_DEF 257 | UVC_CTRL_FLAG_AUTO_UPDATE, 258 }, 259 { 260 .entity = UVC_GUID_UVC_CAMERA, 261 .selector = UVC_CT_IRIS_ABSOLUTE_CONTROL, 262 .index = 7, 263 .size = 2, 264 .flags = UVC_CTRL_FLAG_SET_CUR 265 | UVC_CTRL_FLAG_GET_RANGE 266 | UVC_CTRL_FLAG_RESTORE 267 | UVC_CTRL_FLAG_AUTO_UPDATE, 268 }, 269 { 270 .entity = UVC_GUID_UVC_CAMERA, 271 .selector = UVC_CT_IRIS_RELATIVE_CONTROL, 272 .index = 8, 273 .size = 1, 274 .flags = UVC_CTRL_FLAG_SET_CUR 275 | UVC_CTRL_FLAG_AUTO_UPDATE, 276 }, 277 { 278 .entity = UVC_GUID_UVC_CAMERA, 279 .selector = UVC_CT_ZOOM_ABSOLUTE_CONTROL, 280 .index = 9, 281 .size = 2, 282 .flags = UVC_CTRL_FLAG_SET_CUR 283 | UVC_CTRL_FLAG_GET_RANGE 284 | UVC_CTRL_FLAG_RESTORE 285 | UVC_CTRL_FLAG_AUTO_UPDATE, 286 }, 287 { 288 .entity = UVC_GUID_UVC_CAMERA, 289 .selector = UVC_CT_ZOOM_RELATIVE_CONTROL, 290 .index = 10, 291 .size = 3, 292 .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_MIN 293 | UVC_CTRL_FLAG_GET_MAX | UVC_CTRL_FLAG_GET_RES 294 | UVC_CTRL_FLAG_GET_DEF 295 | UVC_CTRL_FLAG_AUTO_UPDATE, 296 }, 297 { 298 .entity = UVC_GUID_UVC_CAMERA, 299 .selector = UVC_CT_PANTILT_ABSOLUTE_CONTROL, 300 .index = 11, 301 .size = 8, 302 .flags = UVC_CTRL_FLAG_SET_CUR 303 | UVC_CTRL_FLAG_GET_RANGE 304 | UVC_CTRL_FLAG_RESTORE 305 | UVC_CTRL_FLAG_AUTO_UPDATE, 306 }, 307 { 308 .entity = UVC_GUID_UVC_CAMERA, 309 .selector = UVC_CT_PANTILT_RELATIVE_CONTROL, 310 .index = 12, 311 .size = 4, 312 .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_MIN 313 | UVC_CTRL_FLAG_GET_MAX | UVC_CTRL_FLAG_GET_RES 314 | UVC_CTRL_FLAG_GET_DEF 315 | UVC_CTRL_FLAG_AUTO_UPDATE, 316 }, 317 { 318 .entity = UVC_GUID_UVC_CAMERA, 319 .selector = UVC_CT_ROLL_ABSOLUTE_CONTROL, 320 .index = 13, 321 .size = 2, 322 .flags = UVC_CTRL_FLAG_SET_CUR 323 | UVC_CTRL_FLAG_GET_RANGE 324 | UVC_CTRL_FLAG_RESTORE 325 | UVC_CTRL_FLAG_AUTO_UPDATE, 326 }, 327 { 328 .entity = UVC_GUID_UVC_CAMERA, 329 .selector = UVC_CT_ROLL_RELATIVE_CONTROL, 330 .index = 14, 331 .size = 2, 332 .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_MIN 333 | UVC_CTRL_FLAG_GET_MAX | UVC_CTRL_FLAG_GET_RES 334 | UVC_CTRL_FLAG_GET_DEF 335 | UVC_CTRL_FLAG_AUTO_UPDATE, 336 }, 337 { 338 .entity = UVC_GUID_UVC_CAMERA, 339 .selector = UVC_CT_FOCUS_AUTO_CONTROL, 340 .index = 17, 341 .size = 1, 342 .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR 343 | UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_RESTORE, 344 }, 345 { 346 .entity = UVC_GUID_UVC_CAMERA, 347 .selector = UVC_CT_PRIVACY_CONTROL, 348 .index = 18, 349 .size = 1, 350 .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR 351 | UVC_CTRL_FLAG_RESTORE 352 | UVC_CTRL_FLAG_AUTO_UPDATE, 353 }, 354 }; 355 356 static struct uvc_menu_info power_line_frequency_controls[] = { 357 { 0, "Disabled" }, 358 { 1, "50 Hz" }, 359 { 2, "60 Hz" }, 360 }; 361 362 static struct uvc_menu_info exposure_auto_controls[] = { 363 { 2, "Auto Mode" }, 364 { 1, "Manual Mode" }, 365 { 4, "Shutter Priority Mode" }, 366 { 8, "Aperture Priority Mode" }, 367 }; 368 369 static __s32 uvc_ctrl_get_zoom(struct uvc_control_mapping *mapping, 370 __u8 query, const __u8 *data) 371 { 372 __s8 zoom = (__s8)data[0]; 373 374 switch (query) { 375 case UVC_GET_CUR: 376 return (zoom == 0) ? 0 : (zoom > 0 ? data[2] : -data[2]); 377 378 case UVC_GET_MIN: 379 case UVC_GET_MAX: 380 case UVC_GET_RES: 381 case UVC_GET_DEF: 382 default: 383 return data[2]; 384 } 385 } 386 387 static void uvc_ctrl_set_zoom(struct uvc_control_mapping *mapping, 388 __s32 value, __u8 *data) 389 { 390 data[0] = value == 0 ? 0 : (value > 0) ? 1 : 0xff; 391 data[2] = min((int)abs(value), 0xff); 392 } 393 394 static struct uvc_control_mapping uvc_ctrl_mappings[] = { 395 { 396 .id = V4L2_CID_BRIGHTNESS, 397 .name = "Brightness", 398 .entity = UVC_GUID_UVC_PROCESSING, 399 .selector = UVC_PU_BRIGHTNESS_CONTROL, 400 .size = 16, 401 .offset = 0, 402 .v4l2_type = V4L2_CTRL_TYPE_INTEGER, 403 .data_type = UVC_CTRL_DATA_TYPE_SIGNED, 404 }, 405 { 406 .id = V4L2_CID_CONTRAST, 407 .name = "Contrast", 408 .entity = UVC_GUID_UVC_PROCESSING, 409 .selector = UVC_PU_CONTRAST_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_HUE, 417 .name = "Hue", 418 .entity = UVC_GUID_UVC_PROCESSING, 419 .selector = UVC_PU_HUE_CONTROL, 420 .size = 16, 421 .offset = 0, 422 .v4l2_type = V4L2_CTRL_TYPE_INTEGER, 423 .data_type = UVC_CTRL_DATA_TYPE_SIGNED, 424 .master_id = V4L2_CID_HUE_AUTO, 425 .master_manual = 0, 426 }, 427 { 428 .id = V4L2_CID_SATURATION, 429 .name = "Saturation", 430 .entity = UVC_GUID_UVC_PROCESSING, 431 .selector = UVC_PU_SATURATION_CONTROL, 432 .size = 16, 433 .offset = 0, 434 .v4l2_type = V4L2_CTRL_TYPE_INTEGER, 435 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED, 436 }, 437 { 438 .id = V4L2_CID_SHARPNESS, 439 .name = "Sharpness", 440 .entity = UVC_GUID_UVC_PROCESSING, 441 .selector = UVC_PU_SHARPNESS_CONTROL, 442 .size = 16, 443 .offset = 0, 444 .v4l2_type = V4L2_CTRL_TYPE_INTEGER, 445 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED, 446 }, 447 { 448 .id = V4L2_CID_GAMMA, 449 .name = "Gamma", 450 .entity = UVC_GUID_UVC_PROCESSING, 451 .selector = UVC_PU_GAMMA_CONTROL, 452 .size = 16, 453 .offset = 0, 454 .v4l2_type = V4L2_CTRL_TYPE_INTEGER, 455 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED, 456 }, 457 { 458 .id = V4L2_CID_BACKLIGHT_COMPENSATION, 459 .name = "Backlight Compensation", 460 .entity = UVC_GUID_UVC_PROCESSING, 461 .selector = UVC_PU_BACKLIGHT_COMPENSATION_CONTROL, 462 .size = 16, 463 .offset = 0, 464 .v4l2_type = V4L2_CTRL_TYPE_INTEGER, 465 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED, 466 }, 467 { 468 .id = V4L2_CID_GAIN, 469 .name = "Gain", 470 .entity = UVC_GUID_UVC_PROCESSING, 471 .selector = UVC_PU_GAIN_CONTROL, 472 .size = 16, 473 .offset = 0, 474 .v4l2_type = V4L2_CTRL_TYPE_INTEGER, 475 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED, 476 }, 477 { 478 .id = V4L2_CID_POWER_LINE_FREQUENCY, 479 .name = "Power Line Frequency", 480 .entity = UVC_GUID_UVC_PROCESSING, 481 .selector = UVC_PU_POWER_LINE_FREQUENCY_CONTROL, 482 .size = 2, 483 .offset = 0, 484 .v4l2_type = V4L2_CTRL_TYPE_MENU, 485 .data_type = UVC_CTRL_DATA_TYPE_ENUM, 486 .menu_info = power_line_frequency_controls, 487 .menu_count = ARRAY_SIZE(power_line_frequency_controls), 488 }, 489 { 490 .id = V4L2_CID_HUE_AUTO, 491 .name = "Hue, Auto", 492 .entity = UVC_GUID_UVC_PROCESSING, 493 .selector = UVC_PU_HUE_AUTO_CONTROL, 494 .size = 1, 495 .offset = 0, 496 .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN, 497 .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN, 498 .slave_ids = { V4L2_CID_HUE, }, 499 }, 500 { 501 .id = V4L2_CID_EXPOSURE_AUTO, 502 .name = "Exposure, Auto", 503 .entity = UVC_GUID_UVC_CAMERA, 504 .selector = UVC_CT_AE_MODE_CONTROL, 505 .size = 4, 506 .offset = 0, 507 .v4l2_type = V4L2_CTRL_TYPE_MENU, 508 .data_type = UVC_CTRL_DATA_TYPE_BITMASK, 509 .menu_info = exposure_auto_controls, 510 .menu_count = ARRAY_SIZE(exposure_auto_controls), 511 .slave_ids = { V4L2_CID_EXPOSURE_ABSOLUTE, }, 512 }, 513 { 514 .id = V4L2_CID_EXPOSURE_AUTO_PRIORITY, 515 .name = "Exposure, Auto Priority", 516 .entity = UVC_GUID_UVC_CAMERA, 517 .selector = UVC_CT_AE_PRIORITY_CONTROL, 518 .size = 1, 519 .offset = 0, 520 .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN, 521 .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN, 522 }, 523 { 524 .id = V4L2_CID_EXPOSURE_ABSOLUTE, 525 .name = "Exposure (Absolute)", 526 .entity = UVC_GUID_UVC_CAMERA, 527 .selector = UVC_CT_EXPOSURE_TIME_ABSOLUTE_CONTROL, 528 .size = 32, 529 .offset = 0, 530 .v4l2_type = V4L2_CTRL_TYPE_INTEGER, 531 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED, 532 .master_id = V4L2_CID_EXPOSURE_AUTO, 533 .master_manual = V4L2_EXPOSURE_MANUAL, 534 }, 535 { 536 .id = V4L2_CID_AUTO_WHITE_BALANCE, 537 .name = "White Balance Temperature, Auto", 538 .entity = UVC_GUID_UVC_PROCESSING, 539 .selector = UVC_PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL, 540 .size = 1, 541 .offset = 0, 542 .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN, 543 .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN, 544 .slave_ids = { V4L2_CID_WHITE_BALANCE_TEMPERATURE, }, 545 }, 546 { 547 .id = V4L2_CID_WHITE_BALANCE_TEMPERATURE, 548 .name = "White Balance Temperature", 549 .entity = UVC_GUID_UVC_PROCESSING, 550 .selector = UVC_PU_WHITE_BALANCE_TEMPERATURE_CONTROL, 551 .size = 16, 552 .offset = 0, 553 .v4l2_type = V4L2_CTRL_TYPE_INTEGER, 554 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED, 555 .master_id = V4L2_CID_AUTO_WHITE_BALANCE, 556 .master_manual = 0, 557 }, 558 { 559 .id = V4L2_CID_AUTO_WHITE_BALANCE, 560 .name = "White Balance Component, Auto", 561 .entity = UVC_GUID_UVC_PROCESSING, 562 .selector = UVC_PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL, 563 .size = 1, 564 .offset = 0, 565 .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN, 566 .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN, 567 .slave_ids = { V4L2_CID_BLUE_BALANCE, 568 V4L2_CID_RED_BALANCE }, 569 }, 570 { 571 .id = V4L2_CID_BLUE_BALANCE, 572 .name = "White Balance Blue Component", 573 .entity = UVC_GUID_UVC_PROCESSING, 574 .selector = UVC_PU_WHITE_BALANCE_COMPONENT_CONTROL, 575 .size = 16, 576 .offset = 0, 577 .v4l2_type = V4L2_CTRL_TYPE_INTEGER, 578 .data_type = UVC_CTRL_DATA_TYPE_SIGNED, 579 .master_id = V4L2_CID_AUTO_WHITE_BALANCE, 580 .master_manual = 0, 581 }, 582 { 583 .id = V4L2_CID_RED_BALANCE, 584 .name = "White Balance Red Component", 585 .entity = UVC_GUID_UVC_PROCESSING, 586 .selector = UVC_PU_WHITE_BALANCE_COMPONENT_CONTROL, 587 .size = 16, 588 .offset = 16, 589 .v4l2_type = V4L2_CTRL_TYPE_INTEGER, 590 .data_type = UVC_CTRL_DATA_TYPE_SIGNED, 591 .master_id = V4L2_CID_AUTO_WHITE_BALANCE, 592 .master_manual = 0, 593 }, 594 { 595 .id = V4L2_CID_FOCUS_ABSOLUTE, 596 .name = "Focus (absolute)", 597 .entity = UVC_GUID_UVC_CAMERA, 598 .selector = UVC_CT_FOCUS_ABSOLUTE_CONTROL, 599 .size = 16, 600 .offset = 0, 601 .v4l2_type = V4L2_CTRL_TYPE_INTEGER, 602 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED, 603 .master_id = V4L2_CID_FOCUS_AUTO, 604 .master_manual = 0, 605 }, 606 { 607 .id = V4L2_CID_FOCUS_AUTO, 608 .name = "Focus, Auto", 609 .entity = UVC_GUID_UVC_CAMERA, 610 .selector = UVC_CT_FOCUS_AUTO_CONTROL, 611 .size = 1, 612 .offset = 0, 613 .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN, 614 .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN, 615 .slave_ids = { V4L2_CID_FOCUS_ABSOLUTE, }, 616 }, 617 { 618 .id = V4L2_CID_IRIS_ABSOLUTE, 619 .name = "Iris, Absolute", 620 .entity = UVC_GUID_UVC_CAMERA, 621 .selector = UVC_CT_IRIS_ABSOLUTE_CONTROL, 622 .size = 16, 623 .offset = 0, 624 .v4l2_type = V4L2_CTRL_TYPE_INTEGER, 625 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED, 626 }, 627 { 628 .id = V4L2_CID_IRIS_RELATIVE, 629 .name = "Iris, Relative", 630 .entity = UVC_GUID_UVC_CAMERA, 631 .selector = UVC_CT_IRIS_RELATIVE_CONTROL, 632 .size = 8, 633 .offset = 0, 634 .v4l2_type = V4L2_CTRL_TYPE_INTEGER, 635 .data_type = UVC_CTRL_DATA_TYPE_SIGNED, 636 }, 637 { 638 .id = V4L2_CID_ZOOM_ABSOLUTE, 639 .name = "Zoom, Absolute", 640 .entity = UVC_GUID_UVC_CAMERA, 641 .selector = UVC_CT_ZOOM_ABSOLUTE_CONTROL, 642 .size = 16, 643 .offset = 0, 644 .v4l2_type = V4L2_CTRL_TYPE_INTEGER, 645 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED, 646 }, 647 { 648 .id = V4L2_CID_ZOOM_CONTINUOUS, 649 .name = "Zoom, Continuous", 650 .entity = UVC_GUID_UVC_CAMERA, 651 .selector = UVC_CT_ZOOM_RELATIVE_CONTROL, 652 .size = 0, 653 .offset = 0, 654 .v4l2_type = V4L2_CTRL_TYPE_INTEGER, 655 .data_type = UVC_CTRL_DATA_TYPE_SIGNED, 656 .get = uvc_ctrl_get_zoom, 657 .set = uvc_ctrl_set_zoom, 658 }, 659 { 660 .id = V4L2_CID_PAN_ABSOLUTE, 661 .name = "Pan (Absolute)", 662 .entity = UVC_GUID_UVC_CAMERA, 663 .selector = UVC_CT_PANTILT_ABSOLUTE_CONTROL, 664 .size = 32, 665 .offset = 0, 666 .v4l2_type = V4L2_CTRL_TYPE_INTEGER, 667 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED, 668 }, 669 { 670 .id = V4L2_CID_TILT_ABSOLUTE, 671 .name = "Tilt (Absolute)", 672 .entity = UVC_GUID_UVC_CAMERA, 673 .selector = UVC_CT_PANTILT_ABSOLUTE_CONTROL, 674 .size = 32, 675 .offset = 32, 676 .v4l2_type = V4L2_CTRL_TYPE_INTEGER, 677 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED, 678 }, 679 { 680 .id = V4L2_CID_PRIVACY, 681 .name = "Privacy", 682 .entity = UVC_GUID_UVC_CAMERA, 683 .selector = UVC_CT_PRIVACY_CONTROL, 684 .size = 1, 685 .offset = 0, 686 .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN, 687 .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN, 688 }, 689 }; 690 691 /* ------------------------------------------------------------------------ 692 * Utility functions 693 */ 694 695 static inline __u8 *uvc_ctrl_data(struct uvc_control *ctrl, int id) 696 { 697 return ctrl->uvc_data + id * ctrl->info.size; 698 } 699 700 static inline int uvc_test_bit(const __u8 *data, int bit) 701 { 702 return (data[bit >> 3] >> (bit & 7)) & 1; 703 } 704 705 static inline void uvc_clear_bit(__u8 *data, int bit) 706 { 707 data[bit >> 3] &= ~(1 << (bit & 7)); 708 } 709 710 /* Extract the bit string specified by mapping->offset and mapping->size 711 * from the little-endian data stored at 'data' and return the result as 712 * a signed 32bit integer. Sign extension will be performed if the mapping 713 * references a signed data type. 714 */ 715 static __s32 uvc_get_le_value(struct uvc_control_mapping *mapping, 716 __u8 query, const __u8 *data) 717 { 718 int bits = mapping->size; 719 int offset = mapping->offset; 720 __s32 value = 0; 721 __u8 mask; 722 723 data += offset / 8; 724 offset &= 7; 725 mask = ((1LL << bits) - 1) << offset; 726 727 for (; bits > 0; data++) { 728 __u8 byte = *data & mask; 729 value |= offset > 0 ? (byte >> offset) : (byte << (-offset)); 730 bits -= 8 - (offset > 0 ? offset : 0); 731 offset -= 8; 732 mask = (1 << bits) - 1; 733 } 734 735 /* Sign-extend the value if needed. */ 736 if (mapping->data_type == UVC_CTRL_DATA_TYPE_SIGNED) 737 value |= -(value & (1 << (mapping->size - 1))); 738 739 return value; 740 } 741 742 /* Set the bit string specified by mapping->offset and mapping->size 743 * in the little-endian data stored at 'data' to the value 'value'. 744 */ 745 static void uvc_set_le_value(struct uvc_control_mapping *mapping, 746 __s32 value, __u8 *data) 747 { 748 int bits = mapping->size; 749 int offset = mapping->offset; 750 __u8 mask; 751 752 /* According to the v4l2 spec, writing any value to a button control 753 * should result in the action belonging to the button control being 754 * triggered. UVC devices however want to see a 1 written -> override 755 * value. 756 */ 757 if (mapping->v4l2_type == V4L2_CTRL_TYPE_BUTTON) 758 value = -1; 759 760 data += offset / 8; 761 offset &= 7; 762 763 for (; bits > 0; data++) { 764 mask = ((1LL << bits) - 1) << offset; 765 *data = (*data & ~mask) | ((value << offset) & mask); 766 value >>= offset ? offset : 8; 767 bits -= 8 - offset; 768 offset = 0; 769 } 770 } 771 772 /* ------------------------------------------------------------------------ 773 * Terminal and unit management 774 */ 775 776 static const __u8 uvc_processing_guid[16] = UVC_GUID_UVC_PROCESSING; 777 static const __u8 uvc_camera_guid[16] = UVC_GUID_UVC_CAMERA; 778 static const __u8 uvc_media_transport_input_guid[16] = 779 UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT; 780 781 static int uvc_entity_match_guid(const struct uvc_entity *entity, 782 const __u8 guid[16]) 783 { 784 switch (UVC_ENTITY_TYPE(entity)) { 785 case UVC_ITT_CAMERA: 786 return memcmp(uvc_camera_guid, guid, 16) == 0; 787 788 case UVC_ITT_MEDIA_TRANSPORT_INPUT: 789 return memcmp(uvc_media_transport_input_guid, guid, 16) == 0; 790 791 case UVC_VC_PROCESSING_UNIT: 792 return memcmp(uvc_processing_guid, guid, 16) == 0; 793 794 case UVC_VC_EXTENSION_UNIT: 795 return memcmp(entity->extension.guidExtensionCode, 796 guid, 16) == 0; 797 798 default: 799 return 0; 800 } 801 } 802 803 /* ------------------------------------------------------------------------ 804 * UVC Controls 805 */ 806 807 static void __uvc_find_control(struct uvc_entity *entity, __u32 v4l2_id, 808 struct uvc_control_mapping **mapping, struct uvc_control **control, 809 int next) 810 { 811 struct uvc_control *ctrl; 812 struct uvc_control_mapping *map; 813 unsigned int i; 814 815 if (entity == NULL) 816 return; 817 818 for (i = 0; i < entity->ncontrols; ++i) { 819 ctrl = &entity->controls[i]; 820 if (!ctrl->initialized) 821 continue; 822 823 list_for_each_entry(map, &ctrl->info.mappings, list) { 824 if ((map->id == v4l2_id) && !next) { 825 *control = ctrl; 826 *mapping = map; 827 return; 828 } 829 830 if ((*mapping == NULL || (*mapping)->id > map->id) && 831 (map->id > v4l2_id) && next) { 832 *control = ctrl; 833 *mapping = map; 834 } 835 } 836 } 837 } 838 839 static struct uvc_control *uvc_find_control(struct uvc_video_chain *chain, 840 __u32 v4l2_id, struct uvc_control_mapping **mapping) 841 { 842 struct uvc_control *ctrl = NULL; 843 struct uvc_entity *entity; 844 int next = v4l2_id & V4L2_CTRL_FLAG_NEXT_CTRL; 845 846 *mapping = NULL; 847 848 /* Mask the query flags. */ 849 v4l2_id &= V4L2_CTRL_ID_MASK; 850 851 /* Find the control. */ 852 list_for_each_entry(entity, &chain->entities, chain) { 853 __uvc_find_control(entity, v4l2_id, mapping, &ctrl, next); 854 if (ctrl && !next) 855 return ctrl; 856 } 857 858 if (ctrl == NULL && !next) 859 uvc_trace(UVC_TRACE_CONTROL, "Control 0x%08x not found.\n", 860 v4l2_id); 861 862 return ctrl; 863 } 864 865 static int uvc_ctrl_populate_cache(struct uvc_video_chain *chain, 866 struct uvc_control *ctrl) 867 { 868 int ret; 869 870 if (ctrl->info.flags & UVC_CTRL_FLAG_GET_DEF) { 871 ret = uvc_query_ctrl(chain->dev, UVC_GET_DEF, ctrl->entity->id, 872 chain->dev->intfnum, ctrl->info.selector, 873 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_DEF), 874 ctrl->info.size); 875 if (ret < 0) 876 return ret; 877 } 878 879 if (ctrl->info.flags & UVC_CTRL_FLAG_GET_MIN) { 880 ret = uvc_query_ctrl(chain->dev, UVC_GET_MIN, ctrl->entity->id, 881 chain->dev->intfnum, ctrl->info.selector, 882 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MIN), 883 ctrl->info.size); 884 if (ret < 0) 885 return ret; 886 } 887 if (ctrl->info.flags & UVC_CTRL_FLAG_GET_MAX) { 888 ret = uvc_query_ctrl(chain->dev, UVC_GET_MAX, ctrl->entity->id, 889 chain->dev->intfnum, ctrl->info.selector, 890 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MAX), 891 ctrl->info.size); 892 if (ret < 0) 893 return ret; 894 } 895 if (ctrl->info.flags & UVC_CTRL_FLAG_GET_RES) { 896 ret = uvc_query_ctrl(chain->dev, UVC_GET_RES, ctrl->entity->id, 897 chain->dev->intfnum, ctrl->info.selector, 898 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES), 899 ctrl->info.size); 900 if (ret < 0) { 901 if (UVC_ENTITY_TYPE(ctrl->entity) != 902 UVC_VC_EXTENSION_UNIT) 903 return ret; 904 905 /* GET_RES is mandatory for XU controls, but some 906 * cameras still choke on it. Ignore errors and set the 907 * resolution value to zero. 908 */ 909 uvc_warn_once(chain->dev, UVC_WARN_XU_GET_RES, 910 "UVC non compliance - GET_RES failed on " 911 "an XU control. Enabling workaround.\n"); 912 memset(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES), 0, 913 ctrl->info.size); 914 } 915 } 916 917 ctrl->cached = 1; 918 return 0; 919 } 920 921 static int __uvc_ctrl_get(struct uvc_video_chain *chain, 922 struct uvc_control *ctrl, struct uvc_control_mapping *mapping, 923 s32 *value) 924 { 925 struct uvc_menu_info *menu; 926 unsigned int i; 927 int ret; 928 929 if ((ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR) == 0) 930 return -EACCES; 931 932 if (!ctrl->loaded) { 933 ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR, ctrl->entity->id, 934 chain->dev->intfnum, ctrl->info.selector, 935 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT), 936 ctrl->info.size); 937 if (ret < 0) 938 return ret; 939 940 ctrl->loaded = 1; 941 } 942 943 *value = mapping->get(mapping, UVC_GET_CUR, 944 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT)); 945 946 if (mapping->v4l2_type == V4L2_CTRL_TYPE_MENU) { 947 menu = mapping->menu_info; 948 for (i = 0; i < mapping->menu_count; ++i, ++menu) { 949 if (menu->value == *value) { 950 *value = i; 951 break; 952 } 953 } 954 } 955 956 return 0; 957 } 958 959 static int __uvc_query_v4l2_ctrl(struct uvc_video_chain *chain, 960 struct uvc_control *ctrl, 961 struct uvc_control_mapping *mapping, 962 struct v4l2_queryctrl *v4l2_ctrl) 963 { 964 struct uvc_control_mapping *master_map = NULL; 965 struct uvc_control *master_ctrl = NULL; 966 struct uvc_menu_info *menu; 967 unsigned int i; 968 969 memset(v4l2_ctrl, 0, sizeof *v4l2_ctrl); 970 v4l2_ctrl->id = mapping->id; 971 v4l2_ctrl->type = mapping->v4l2_type; 972 strlcpy(v4l2_ctrl->name, mapping->name, sizeof v4l2_ctrl->name); 973 v4l2_ctrl->flags = 0; 974 975 if (!(ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR)) 976 v4l2_ctrl->flags |= V4L2_CTRL_FLAG_WRITE_ONLY; 977 if (!(ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR)) 978 v4l2_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY; 979 980 if (mapping->master_id) 981 __uvc_find_control(ctrl->entity, mapping->master_id, 982 &master_map, &master_ctrl, 0); 983 if (master_ctrl && (master_ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR)) { 984 s32 val; 985 int ret = __uvc_ctrl_get(chain, master_ctrl, master_map, &val); 986 if (ret < 0) 987 return ret; 988 989 if (val != mapping->master_manual) 990 v4l2_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE; 991 } 992 993 if (!ctrl->cached) { 994 int ret = uvc_ctrl_populate_cache(chain, ctrl); 995 if (ret < 0) 996 return ret; 997 } 998 999 if (ctrl->info.flags & UVC_CTRL_FLAG_GET_DEF) { 1000 v4l2_ctrl->default_value = mapping->get(mapping, UVC_GET_DEF, 1001 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_DEF)); 1002 } 1003 1004 switch (mapping->v4l2_type) { 1005 case V4L2_CTRL_TYPE_MENU: 1006 v4l2_ctrl->minimum = 0; 1007 v4l2_ctrl->maximum = mapping->menu_count - 1; 1008 v4l2_ctrl->step = 1; 1009 1010 menu = mapping->menu_info; 1011 for (i = 0; i < mapping->menu_count; ++i, ++menu) { 1012 if (menu->value == v4l2_ctrl->default_value) { 1013 v4l2_ctrl->default_value = i; 1014 break; 1015 } 1016 } 1017 1018 return 0; 1019 1020 case V4L2_CTRL_TYPE_BOOLEAN: 1021 v4l2_ctrl->minimum = 0; 1022 v4l2_ctrl->maximum = 1; 1023 v4l2_ctrl->step = 1; 1024 return 0; 1025 1026 case V4L2_CTRL_TYPE_BUTTON: 1027 v4l2_ctrl->minimum = 0; 1028 v4l2_ctrl->maximum = 0; 1029 v4l2_ctrl->step = 0; 1030 return 0; 1031 1032 default: 1033 break; 1034 } 1035 1036 if (ctrl->info.flags & UVC_CTRL_FLAG_GET_MIN) 1037 v4l2_ctrl->minimum = mapping->get(mapping, UVC_GET_MIN, 1038 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MIN)); 1039 1040 if (ctrl->info.flags & UVC_CTRL_FLAG_GET_MAX) 1041 v4l2_ctrl->maximum = mapping->get(mapping, UVC_GET_MAX, 1042 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MAX)); 1043 1044 if (ctrl->info.flags & UVC_CTRL_FLAG_GET_RES) 1045 v4l2_ctrl->step = mapping->get(mapping, UVC_GET_RES, 1046 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES)); 1047 1048 return 0; 1049 } 1050 1051 int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain, 1052 struct v4l2_queryctrl *v4l2_ctrl) 1053 { 1054 struct uvc_control *ctrl; 1055 struct uvc_control_mapping *mapping; 1056 int ret; 1057 1058 ret = mutex_lock_interruptible(&chain->ctrl_mutex); 1059 if (ret < 0) 1060 return -ERESTARTSYS; 1061 1062 ctrl = uvc_find_control(chain, v4l2_ctrl->id, &mapping); 1063 if (ctrl == NULL) { 1064 ret = -ENOENT; 1065 goto done; 1066 } 1067 1068 ret = __uvc_query_v4l2_ctrl(chain, ctrl, mapping, v4l2_ctrl); 1069 done: 1070 mutex_unlock(&chain->ctrl_mutex); 1071 return ret; 1072 } 1073 1074 /* 1075 * Mapping V4L2 controls to UVC controls can be straighforward if done well. 1076 * Most of the UVC controls exist in V4L2, and can be mapped directly. Some 1077 * must be grouped (for instance the Red Balance, Blue Balance and Do White 1078 * Balance V4L2 controls use the White Balance Component UVC control) or 1079 * otherwise translated. The approach we take here is to use a translation 1080 * table for the controls that can be mapped directly, and handle the others 1081 * manually. 1082 */ 1083 int uvc_query_v4l2_menu(struct uvc_video_chain *chain, 1084 struct v4l2_querymenu *query_menu) 1085 { 1086 struct uvc_menu_info *menu_info; 1087 struct uvc_control_mapping *mapping; 1088 struct uvc_control *ctrl; 1089 u32 index = query_menu->index; 1090 u32 id = query_menu->id; 1091 int ret; 1092 1093 memset(query_menu, 0, sizeof(*query_menu)); 1094 query_menu->id = id; 1095 query_menu->index = index; 1096 1097 ret = mutex_lock_interruptible(&chain->ctrl_mutex); 1098 if (ret < 0) 1099 return -ERESTARTSYS; 1100 1101 ctrl = uvc_find_control(chain, query_menu->id, &mapping); 1102 if (ctrl == NULL) { 1103 ret = -ENOENT; 1104 goto done; 1105 } 1106 1107 if (mapping->v4l2_type != V4L2_CTRL_TYPE_MENU || 1108 query_menu->index >= mapping->menu_count) { 1109 ret = -EINVAL; 1110 goto done; 1111 } 1112 1113 menu_info = &mapping->menu_info[query_menu->index]; 1114 1115 if (mapping->data_type == UVC_CTRL_DATA_TYPE_BITMASK && 1116 (ctrl->info.flags & UVC_CTRL_FLAG_GET_RES)) { 1117 s32 bitmap; 1118 1119 if (!ctrl->cached) { 1120 ret = uvc_ctrl_populate_cache(chain, ctrl); 1121 if (ret < 0) 1122 goto done; 1123 } 1124 1125 bitmap = mapping->get(mapping, UVC_GET_RES, 1126 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES)); 1127 if (!(bitmap & menu_info->value)) { 1128 ret = -EINVAL; 1129 goto done; 1130 } 1131 } 1132 1133 strlcpy(query_menu->name, menu_info->name, sizeof query_menu->name); 1134 1135 done: 1136 mutex_unlock(&chain->ctrl_mutex); 1137 return ret; 1138 } 1139 1140 /* -------------------------------------------------------------------------- 1141 * Ctrl event handling 1142 */ 1143 1144 static void uvc_ctrl_fill_event(struct uvc_video_chain *chain, 1145 struct v4l2_event *ev, 1146 struct uvc_control *ctrl, 1147 struct uvc_control_mapping *mapping, 1148 s32 value, u32 changes) 1149 { 1150 struct v4l2_queryctrl v4l2_ctrl; 1151 1152 __uvc_query_v4l2_ctrl(chain, ctrl, mapping, &v4l2_ctrl); 1153 1154 memset(ev->reserved, 0, sizeof(ev->reserved)); 1155 ev->type = V4L2_EVENT_CTRL; 1156 ev->id = v4l2_ctrl.id; 1157 ev->u.ctrl.value = value; 1158 ev->u.ctrl.changes = changes; 1159 ev->u.ctrl.type = v4l2_ctrl.type; 1160 ev->u.ctrl.flags = v4l2_ctrl.flags; 1161 ev->u.ctrl.minimum = v4l2_ctrl.minimum; 1162 ev->u.ctrl.maximum = v4l2_ctrl.maximum; 1163 ev->u.ctrl.step = v4l2_ctrl.step; 1164 ev->u.ctrl.default_value = v4l2_ctrl.default_value; 1165 } 1166 1167 static void uvc_ctrl_send_event(struct uvc_fh *handle, 1168 struct uvc_control *ctrl, struct uvc_control_mapping *mapping, 1169 s32 value, u32 changes) 1170 { 1171 struct v4l2_subscribed_event *sev; 1172 struct v4l2_event ev; 1173 1174 if (list_empty(&mapping->ev_subs)) 1175 return; 1176 1177 uvc_ctrl_fill_event(handle->chain, &ev, ctrl, mapping, value, changes); 1178 1179 list_for_each_entry(sev, &mapping->ev_subs, node) { 1180 if (sev->fh && (sev->fh != &handle->vfh || 1181 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK) || 1182 (changes & V4L2_EVENT_CTRL_CH_FLAGS))) 1183 v4l2_event_queue_fh(sev->fh, &ev); 1184 } 1185 } 1186 1187 static void uvc_ctrl_send_slave_event(struct uvc_fh *handle, 1188 struct uvc_control *master, u32 slave_id, 1189 const struct v4l2_ext_control *xctrls, unsigned int xctrls_count) 1190 { 1191 struct uvc_control_mapping *mapping = NULL; 1192 struct uvc_control *ctrl = NULL; 1193 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS; 1194 unsigned int i; 1195 s32 val = 0; 1196 1197 /* 1198 * We can skip sending an event for the slave if the slave 1199 * is being modified in the same transaction. 1200 */ 1201 for (i = 0; i < xctrls_count; i++) { 1202 if (xctrls[i].id == slave_id) 1203 return; 1204 } 1205 1206 __uvc_find_control(master->entity, slave_id, &mapping, &ctrl, 0); 1207 if (ctrl == NULL) 1208 return; 1209 1210 if (__uvc_ctrl_get(handle->chain, ctrl, mapping, &val) == 0) 1211 changes |= V4L2_EVENT_CTRL_CH_VALUE; 1212 1213 uvc_ctrl_send_event(handle, ctrl, mapping, val, changes); 1214 } 1215 1216 static void uvc_ctrl_send_events(struct uvc_fh *handle, 1217 const struct v4l2_ext_control *xctrls, unsigned int xctrls_count) 1218 { 1219 struct uvc_control_mapping *mapping; 1220 struct uvc_control *ctrl; 1221 u32 changes = V4L2_EVENT_CTRL_CH_VALUE; 1222 unsigned int i; 1223 unsigned int j; 1224 1225 for (i = 0; i < xctrls_count; ++i) { 1226 ctrl = uvc_find_control(handle->chain, xctrls[i].id, &mapping); 1227 1228 for (j = 0; j < ARRAY_SIZE(mapping->slave_ids); ++j) { 1229 if (!mapping->slave_ids[j]) 1230 break; 1231 uvc_ctrl_send_slave_event(handle, ctrl, 1232 mapping->slave_ids[j], 1233 xctrls, xctrls_count); 1234 } 1235 1236 /* 1237 * If the master is being modified in the same transaction 1238 * flags may change too. 1239 */ 1240 if (mapping->master_id) { 1241 for (j = 0; j < xctrls_count; j++) { 1242 if (xctrls[j].id == mapping->master_id) { 1243 changes |= V4L2_EVENT_CTRL_CH_FLAGS; 1244 break; 1245 } 1246 } 1247 } 1248 1249 uvc_ctrl_send_event(handle, ctrl, mapping, xctrls[i].value, 1250 changes); 1251 } 1252 } 1253 1254 static int uvc_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems) 1255 { 1256 struct uvc_fh *handle = container_of(sev->fh, struct uvc_fh, vfh); 1257 struct uvc_control_mapping *mapping; 1258 struct uvc_control *ctrl; 1259 int ret; 1260 1261 ret = mutex_lock_interruptible(&handle->chain->ctrl_mutex); 1262 if (ret < 0) 1263 return -ERESTARTSYS; 1264 1265 ctrl = uvc_find_control(handle->chain, sev->id, &mapping); 1266 if (ctrl == NULL) { 1267 ret = -ENOENT; 1268 goto done; 1269 } 1270 1271 list_add_tail(&sev->node, &mapping->ev_subs); 1272 if (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL) { 1273 struct v4l2_event ev; 1274 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS; 1275 s32 val = 0; 1276 1277 if (__uvc_ctrl_get(handle->chain, ctrl, mapping, &val) == 0) 1278 changes |= V4L2_EVENT_CTRL_CH_VALUE; 1279 1280 uvc_ctrl_fill_event(handle->chain, &ev, ctrl, mapping, val, 1281 changes); 1282 /* Mark the queue as active, allowing this initial 1283 event to be accepted. */ 1284 sev->elems = elems; 1285 v4l2_event_queue_fh(sev->fh, &ev); 1286 } 1287 1288 done: 1289 mutex_unlock(&handle->chain->ctrl_mutex); 1290 return ret; 1291 } 1292 1293 static void uvc_ctrl_del_event(struct v4l2_subscribed_event *sev) 1294 { 1295 struct uvc_fh *handle = container_of(sev->fh, struct uvc_fh, vfh); 1296 1297 mutex_lock(&handle->chain->ctrl_mutex); 1298 list_del(&sev->node); 1299 mutex_unlock(&handle->chain->ctrl_mutex); 1300 } 1301 1302 const struct v4l2_subscribed_event_ops uvc_ctrl_sub_ev_ops = { 1303 .add = uvc_ctrl_add_event, 1304 .del = uvc_ctrl_del_event, 1305 .replace = v4l2_ctrl_replace, 1306 .merge = v4l2_ctrl_merge, 1307 }; 1308 1309 /* -------------------------------------------------------------------------- 1310 * Control transactions 1311 * 1312 * To make extended set operations as atomic as the hardware allows, controls 1313 * are handled using begin/commit/rollback operations. 1314 * 1315 * At the beginning of a set request, uvc_ctrl_begin should be called to 1316 * initialize the request. This function acquires the control lock. 1317 * 1318 * When setting a control, the new value is stored in the control data field 1319 * at position UVC_CTRL_DATA_CURRENT. The control is then marked as dirty for 1320 * later processing. If the UVC and V4L2 control sizes differ, the current 1321 * value is loaded from the hardware before storing the new value in the data 1322 * field. 1323 * 1324 * After processing all controls in the transaction, uvc_ctrl_commit or 1325 * uvc_ctrl_rollback must be called to apply the pending changes to the 1326 * hardware or revert them. When applying changes, all controls marked as 1327 * dirty will be modified in the UVC device, and the dirty flag will be 1328 * cleared. When reverting controls, the control data field 1329 * UVC_CTRL_DATA_CURRENT is reverted to its previous value 1330 * (UVC_CTRL_DATA_BACKUP) for all dirty controls. Both functions release the 1331 * control lock. 1332 */ 1333 int uvc_ctrl_begin(struct uvc_video_chain *chain) 1334 { 1335 return mutex_lock_interruptible(&chain->ctrl_mutex) ? -ERESTARTSYS : 0; 1336 } 1337 1338 static int uvc_ctrl_commit_entity(struct uvc_device *dev, 1339 struct uvc_entity *entity, int rollback) 1340 { 1341 struct uvc_control *ctrl; 1342 unsigned int i; 1343 int ret; 1344 1345 if (entity == NULL) 1346 return 0; 1347 1348 for (i = 0; i < entity->ncontrols; ++i) { 1349 ctrl = &entity->controls[i]; 1350 if (!ctrl->initialized) 1351 continue; 1352 1353 /* Reset the loaded flag for auto-update controls that were 1354 * marked as loaded in uvc_ctrl_get/uvc_ctrl_set to prevent 1355 * uvc_ctrl_get from using the cached value, and for write-only 1356 * controls to prevent uvc_ctrl_set from setting bits not 1357 * explicitly set by the user. 1358 */ 1359 if (ctrl->info.flags & UVC_CTRL_FLAG_AUTO_UPDATE || 1360 !(ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR)) 1361 ctrl->loaded = 0; 1362 1363 if (!ctrl->dirty) 1364 continue; 1365 1366 if (!rollback) 1367 ret = uvc_query_ctrl(dev, UVC_SET_CUR, ctrl->entity->id, 1368 dev->intfnum, ctrl->info.selector, 1369 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT), 1370 ctrl->info.size); 1371 else 1372 ret = 0; 1373 1374 if (rollback || ret < 0) 1375 memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT), 1376 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP), 1377 ctrl->info.size); 1378 1379 ctrl->dirty = 0; 1380 1381 if (ret < 0) 1382 return ret; 1383 } 1384 1385 return 0; 1386 } 1387 1388 int __uvc_ctrl_commit(struct uvc_fh *handle, int rollback, 1389 const struct v4l2_ext_control *xctrls, 1390 unsigned int xctrls_count) 1391 { 1392 struct uvc_video_chain *chain = handle->chain; 1393 struct uvc_entity *entity; 1394 int ret = 0; 1395 1396 /* Find the control. */ 1397 list_for_each_entry(entity, &chain->entities, chain) { 1398 ret = uvc_ctrl_commit_entity(chain->dev, entity, rollback); 1399 if (ret < 0) 1400 goto done; 1401 } 1402 1403 if (!rollback) 1404 uvc_ctrl_send_events(handle, xctrls, xctrls_count); 1405 done: 1406 mutex_unlock(&chain->ctrl_mutex); 1407 return ret; 1408 } 1409 1410 int uvc_ctrl_get(struct uvc_video_chain *chain, 1411 struct v4l2_ext_control *xctrl) 1412 { 1413 struct uvc_control *ctrl; 1414 struct uvc_control_mapping *mapping; 1415 1416 ctrl = uvc_find_control(chain, xctrl->id, &mapping); 1417 if (ctrl == NULL) 1418 return -ENOENT; 1419 1420 return __uvc_ctrl_get(chain, ctrl, mapping, &xctrl->value); 1421 } 1422 1423 int uvc_ctrl_set(struct uvc_video_chain *chain, 1424 struct v4l2_ext_control *xctrl) 1425 { 1426 struct uvc_control *ctrl; 1427 struct uvc_control_mapping *mapping; 1428 s32 value; 1429 u32 step; 1430 s32 min; 1431 s32 max; 1432 int ret; 1433 1434 ctrl = uvc_find_control(chain, xctrl->id, &mapping); 1435 if (ctrl == NULL) 1436 return -ENOENT; 1437 if (!(ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR)) 1438 return -EACCES; 1439 1440 /* Clamp out of range values. */ 1441 switch (mapping->v4l2_type) { 1442 case V4L2_CTRL_TYPE_INTEGER: 1443 if (!ctrl->cached) { 1444 ret = uvc_ctrl_populate_cache(chain, ctrl); 1445 if (ret < 0) 1446 return ret; 1447 } 1448 1449 min = mapping->get(mapping, UVC_GET_MIN, 1450 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MIN)); 1451 max = mapping->get(mapping, UVC_GET_MAX, 1452 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MAX)); 1453 step = mapping->get(mapping, UVC_GET_RES, 1454 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES)); 1455 if (step == 0) 1456 step = 1; 1457 1458 xctrl->value = min + ((u32)(xctrl->value - min) + step / 2) 1459 / step * step; 1460 if (mapping->data_type == UVC_CTRL_DATA_TYPE_SIGNED) 1461 xctrl->value = clamp(xctrl->value, min, max); 1462 else 1463 xctrl->value = clamp_t(u32, xctrl->value, min, max); 1464 value = xctrl->value; 1465 break; 1466 1467 case V4L2_CTRL_TYPE_BOOLEAN: 1468 xctrl->value = clamp(xctrl->value, 0, 1); 1469 value = xctrl->value; 1470 break; 1471 1472 case V4L2_CTRL_TYPE_MENU: 1473 if (xctrl->value < 0 || xctrl->value >= mapping->menu_count) 1474 return -ERANGE; 1475 value = mapping->menu_info[xctrl->value].value; 1476 1477 /* Valid menu indices are reported by the GET_RES request for 1478 * UVC controls that support it. 1479 */ 1480 if (mapping->data_type == UVC_CTRL_DATA_TYPE_BITMASK && 1481 (ctrl->info.flags & UVC_CTRL_FLAG_GET_RES)) { 1482 if (!ctrl->cached) { 1483 ret = uvc_ctrl_populate_cache(chain, ctrl); 1484 if (ret < 0) 1485 return ret; 1486 } 1487 1488 step = mapping->get(mapping, UVC_GET_RES, 1489 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES)); 1490 if (!(step & value)) 1491 return -ERANGE; 1492 } 1493 1494 break; 1495 1496 default: 1497 value = xctrl->value; 1498 break; 1499 } 1500 1501 /* If the mapping doesn't span the whole UVC control, the current value 1502 * needs to be loaded from the device to perform the read-modify-write 1503 * operation. 1504 */ 1505 if (!ctrl->loaded && (ctrl->info.size * 8) != mapping->size) { 1506 if ((ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR) == 0) { 1507 memset(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT), 1508 0, ctrl->info.size); 1509 } else { 1510 ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR, 1511 ctrl->entity->id, chain->dev->intfnum, 1512 ctrl->info.selector, 1513 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT), 1514 ctrl->info.size); 1515 if (ret < 0) 1516 return ret; 1517 } 1518 1519 ctrl->loaded = 1; 1520 } 1521 1522 /* Backup the current value in case we need to rollback later. */ 1523 if (!ctrl->dirty) { 1524 memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP), 1525 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT), 1526 ctrl->info.size); 1527 } 1528 1529 mapping->set(mapping, value, 1530 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT)); 1531 1532 ctrl->dirty = 1; 1533 ctrl->modified = 1; 1534 return 0; 1535 } 1536 1537 /* -------------------------------------------------------------------------- 1538 * Dynamic controls 1539 */ 1540 1541 static void uvc_ctrl_fixup_xu_info(struct uvc_device *dev, 1542 const struct uvc_control *ctrl, struct uvc_control_info *info) 1543 { 1544 struct uvc_ctrl_fixup { 1545 struct usb_device_id id; 1546 u8 entity; 1547 u8 selector; 1548 u8 flags; 1549 }; 1550 1551 static const struct uvc_ctrl_fixup fixups[] = { 1552 { { USB_DEVICE(0x046d, 0x08c2) }, 9, 1, 1553 UVC_CTRL_FLAG_GET_MIN | UVC_CTRL_FLAG_GET_MAX | 1554 UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_SET_CUR | 1555 UVC_CTRL_FLAG_AUTO_UPDATE }, 1556 { { USB_DEVICE(0x046d, 0x08cc) }, 9, 1, 1557 UVC_CTRL_FLAG_GET_MIN | UVC_CTRL_FLAG_GET_MAX | 1558 UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_SET_CUR | 1559 UVC_CTRL_FLAG_AUTO_UPDATE }, 1560 { { USB_DEVICE(0x046d, 0x0994) }, 9, 1, 1561 UVC_CTRL_FLAG_GET_MIN | UVC_CTRL_FLAG_GET_MAX | 1562 UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_SET_CUR | 1563 UVC_CTRL_FLAG_AUTO_UPDATE }, 1564 }; 1565 1566 unsigned int i; 1567 1568 for (i = 0; i < ARRAY_SIZE(fixups); ++i) { 1569 if (!usb_match_one_id(dev->intf, &fixups[i].id)) 1570 continue; 1571 1572 if (fixups[i].entity == ctrl->entity->id && 1573 fixups[i].selector == info->selector) { 1574 info->flags = fixups[i].flags; 1575 return; 1576 } 1577 } 1578 } 1579 1580 /* 1581 * Query control information (size and flags) for XU controls. 1582 */ 1583 static int uvc_ctrl_fill_xu_info(struct uvc_device *dev, 1584 const struct uvc_control *ctrl, struct uvc_control_info *info) 1585 { 1586 u8 *data; 1587 int ret; 1588 1589 data = kmalloc(2, GFP_KERNEL); 1590 if (data == NULL) 1591 return -ENOMEM; 1592 1593 memcpy(info->entity, ctrl->entity->extension.guidExtensionCode, 1594 sizeof(info->entity)); 1595 info->index = ctrl->index; 1596 info->selector = ctrl->index + 1; 1597 1598 /* Query and verify the control length (GET_LEN) */ 1599 ret = uvc_query_ctrl(dev, UVC_GET_LEN, ctrl->entity->id, dev->intfnum, 1600 info->selector, data, 2); 1601 if (ret < 0) { 1602 uvc_trace(UVC_TRACE_CONTROL, 1603 "GET_LEN failed on control %pUl/%u (%d).\n", 1604 info->entity, info->selector, ret); 1605 goto done; 1606 } 1607 1608 info->size = le16_to_cpup((__le16 *)data); 1609 1610 /* Query the control information (GET_INFO) */ 1611 ret = uvc_query_ctrl(dev, UVC_GET_INFO, ctrl->entity->id, dev->intfnum, 1612 info->selector, data, 1); 1613 if (ret < 0) { 1614 uvc_trace(UVC_TRACE_CONTROL, 1615 "GET_INFO failed on control %pUl/%u (%d).\n", 1616 info->entity, info->selector, ret); 1617 goto done; 1618 } 1619 1620 info->flags = UVC_CTRL_FLAG_GET_MIN | UVC_CTRL_FLAG_GET_MAX 1621 | UVC_CTRL_FLAG_GET_RES | UVC_CTRL_FLAG_GET_DEF 1622 | (data[0] & UVC_CONTROL_CAP_GET ? 1623 UVC_CTRL_FLAG_GET_CUR : 0) 1624 | (data[0] & UVC_CONTROL_CAP_SET ? 1625 UVC_CTRL_FLAG_SET_CUR : 0) 1626 | (data[0] & UVC_CONTROL_CAP_AUTOUPDATE ? 1627 UVC_CTRL_FLAG_AUTO_UPDATE : 0); 1628 1629 uvc_ctrl_fixup_xu_info(dev, ctrl, info); 1630 1631 uvc_trace(UVC_TRACE_CONTROL, "XU control %pUl/%u queried: len %u, " 1632 "flags { get %u set %u auto %u }.\n", 1633 info->entity, info->selector, info->size, 1634 (info->flags & UVC_CTRL_FLAG_GET_CUR) ? 1 : 0, 1635 (info->flags & UVC_CTRL_FLAG_SET_CUR) ? 1 : 0, 1636 (info->flags & UVC_CTRL_FLAG_AUTO_UPDATE) ? 1 : 0); 1637 1638 done: 1639 kfree(data); 1640 return ret; 1641 } 1642 1643 static int uvc_ctrl_add_info(struct uvc_device *dev, struct uvc_control *ctrl, 1644 const struct uvc_control_info *info); 1645 1646 static int uvc_ctrl_init_xu_ctrl(struct uvc_device *dev, 1647 struct uvc_control *ctrl) 1648 { 1649 struct uvc_control_info info; 1650 int ret; 1651 1652 if (ctrl->initialized) 1653 return 0; 1654 1655 ret = uvc_ctrl_fill_xu_info(dev, ctrl, &info); 1656 if (ret < 0) 1657 return ret; 1658 1659 ret = uvc_ctrl_add_info(dev, ctrl, &info); 1660 if (ret < 0) 1661 uvc_trace(UVC_TRACE_CONTROL, "Failed to initialize control " 1662 "%pUl/%u on device %s entity %u\n", info.entity, 1663 info.selector, dev->udev->devpath, ctrl->entity->id); 1664 1665 return ret; 1666 } 1667 1668 int uvc_xu_ctrl_query(struct uvc_video_chain *chain, 1669 struct uvc_xu_control_query *xqry) 1670 { 1671 struct uvc_entity *entity; 1672 struct uvc_control *ctrl; 1673 unsigned int i, found = 0; 1674 __u32 reqflags; 1675 __u16 size; 1676 __u8 *data = NULL; 1677 int ret; 1678 1679 /* Find the extension unit. */ 1680 list_for_each_entry(entity, &chain->entities, chain) { 1681 if (UVC_ENTITY_TYPE(entity) == UVC_VC_EXTENSION_UNIT && 1682 entity->id == xqry->unit) 1683 break; 1684 } 1685 1686 if (entity->id != xqry->unit) { 1687 uvc_trace(UVC_TRACE_CONTROL, "Extension unit %u not found.\n", 1688 xqry->unit); 1689 return -ENOENT; 1690 } 1691 1692 /* Find the control and perform delayed initialization if needed. */ 1693 for (i = 0; i < entity->ncontrols; ++i) { 1694 ctrl = &entity->controls[i]; 1695 if (ctrl->index == xqry->selector - 1) { 1696 found = 1; 1697 break; 1698 } 1699 } 1700 1701 if (!found) { 1702 uvc_trace(UVC_TRACE_CONTROL, "Control %pUl/%u not found.\n", 1703 entity->extension.guidExtensionCode, xqry->selector); 1704 return -ENOENT; 1705 } 1706 1707 if (mutex_lock_interruptible(&chain->ctrl_mutex)) 1708 return -ERESTARTSYS; 1709 1710 ret = uvc_ctrl_init_xu_ctrl(chain->dev, ctrl); 1711 if (ret < 0) { 1712 ret = -ENOENT; 1713 goto done; 1714 } 1715 1716 /* Validate the required buffer size and flags for the request */ 1717 reqflags = 0; 1718 size = ctrl->info.size; 1719 1720 switch (xqry->query) { 1721 case UVC_GET_CUR: 1722 reqflags = UVC_CTRL_FLAG_GET_CUR; 1723 break; 1724 case UVC_GET_MIN: 1725 reqflags = UVC_CTRL_FLAG_GET_MIN; 1726 break; 1727 case UVC_GET_MAX: 1728 reqflags = UVC_CTRL_FLAG_GET_MAX; 1729 break; 1730 case UVC_GET_DEF: 1731 reqflags = UVC_CTRL_FLAG_GET_DEF; 1732 break; 1733 case UVC_GET_RES: 1734 reqflags = UVC_CTRL_FLAG_GET_RES; 1735 break; 1736 case UVC_SET_CUR: 1737 reqflags = UVC_CTRL_FLAG_SET_CUR; 1738 break; 1739 case UVC_GET_LEN: 1740 size = 2; 1741 break; 1742 case UVC_GET_INFO: 1743 size = 1; 1744 break; 1745 default: 1746 ret = -EINVAL; 1747 goto done; 1748 } 1749 1750 if (size != xqry->size) { 1751 ret = -ENOBUFS; 1752 goto done; 1753 } 1754 1755 if (reqflags && !(ctrl->info.flags & reqflags)) { 1756 ret = -EBADRQC; 1757 goto done; 1758 } 1759 1760 data = kmalloc(size, GFP_KERNEL); 1761 if (data == NULL) { 1762 ret = -ENOMEM; 1763 goto done; 1764 } 1765 1766 if (xqry->query == UVC_SET_CUR && 1767 copy_from_user(data, xqry->data, size)) { 1768 ret = -EFAULT; 1769 goto done; 1770 } 1771 1772 ret = uvc_query_ctrl(chain->dev, xqry->query, xqry->unit, 1773 chain->dev->intfnum, xqry->selector, data, size); 1774 if (ret < 0) 1775 goto done; 1776 1777 if (xqry->query != UVC_SET_CUR && 1778 copy_to_user(xqry->data, data, size)) 1779 ret = -EFAULT; 1780 done: 1781 kfree(data); 1782 mutex_unlock(&chain->ctrl_mutex); 1783 return ret; 1784 } 1785 1786 /* -------------------------------------------------------------------------- 1787 * Suspend/resume 1788 */ 1789 1790 /* 1791 * Restore control values after resume, skipping controls that haven't been 1792 * changed. 1793 * 1794 * TODO 1795 * - Don't restore modified controls that are back to their default value. 1796 * - Handle restore order (Auto-Exposure Mode should be restored before 1797 * Exposure Time). 1798 */ 1799 int uvc_ctrl_resume_device(struct uvc_device *dev) 1800 { 1801 struct uvc_control *ctrl; 1802 struct uvc_entity *entity; 1803 unsigned int i; 1804 int ret; 1805 1806 /* Walk the entities list and restore controls when possible. */ 1807 list_for_each_entry(entity, &dev->entities, list) { 1808 1809 for (i = 0; i < entity->ncontrols; ++i) { 1810 ctrl = &entity->controls[i]; 1811 1812 if (!ctrl->initialized || !ctrl->modified || 1813 (ctrl->info.flags & UVC_CTRL_FLAG_RESTORE) == 0) 1814 continue; 1815 1816 printk(KERN_INFO "restoring control %pUl/%u/%u\n", 1817 ctrl->info.entity, ctrl->info.index, 1818 ctrl->info.selector); 1819 ctrl->dirty = 1; 1820 } 1821 1822 ret = uvc_ctrl_commit_entity(dev, entity, 0); 1823 if (ret < 0) 1824 return ret; 1825 } 1826 1827 return 0; 1828 } 1829 1830 /* -------------------------------------------------------------------------- 1831 * Control and mapping handling 1832 */ 1833 1834 /* 1835 * Add control information to a given control. 1836 */ 1837 static int uvc_ctrl_add_info(struct uvc_device *dev, struct uvc_control *ctrl, 1838 const struct uvc_control_info *info) 1839 { 1840 int ret = 0; 1841 1842 memcpy(&ctrl->info, info, sizeof(*info)); 1843 INIT_LIST_HEAD(&ctrl->info.mappings); 1844 1845 /* Allocate an array to save control values (cur, def, max, etc.) */ 1846 ctrl->uvc_data = kzalloc(ctrl->info.size * UVC_CTRL_DATA_LAST + 1, 1847 GFP_KERNEL); 1848 if (ctrl->uvc_data == NULL) { 1849 ret = -ENOMEM; 1850 goto done; 1851 } 1852 1853 ctrl->initialized = 1; 1854 1855 uvc_trace(UVC_TRACE_CONTROL, "Added control %pUl/%u to device %s " 1856 "entity %u\n", ctrl->info.entity, ctrl->info.selector, 1857 dev->udev->devpath, ctrl->entity->id); 1858 1859 done: 1860 if (ret < 0) 1861 kfree(ctrl->uvc_data); 1862 return ret; 1863 } 1864 1865 /* 1866 * Add a control mapping to a given control. 1867 */ 1868 static int __uvc_ctrl_add_mapping(struct uvc_device *dev, 1869 struct uvc_control *ctrl, const struct uvc_control_mapping *mapping) 1870 { 1871 struct uvc_control_mapping *map; 1872 unsigned int size; 1873 1874 /* Most mappings come from static kernel data and need to be duplicated. 1875 * Mappings that come from userspace will be unnecessarily duplicated, 1876 * this could be optimized. 1877 */ 1878 map = kmemdup(mapping, sizeof(*mapping), GFP_KERNEL); 1879 if (map == NULL) 1880 return -ENOMEM; 1881 1882 INIT_LIST_HEAD(&map->ev_subs); 1883 1884 size = sizeof(*mapping->menu_info) * mapping->menu_count; 1885 map->menu_info = kmemdup(mapping->menu_info, size, GFP_KERNEL); 1886 if (map->menu_info == NULL) { 1887 kfree(map); 1888 return -ENOMEM; 1889 } 1890 1891 if (map->get == NULL) 1892 map->get = uvc_get_le_value; 1893 if (map->set == NULL) 1894 map->set = uvc_set_le_value; 1895 1896 list_add_tail(&map->list, &ctrl->info.mappings); 1897 uvc_trace(UVC_TRACE_CONTROL, 1898 "Adding mapping '%s' to control %pUl/%u.\n", 1899 map->name, ctrl->info.entity, ctrl->info.selector); 1900 1901 return 0; 1902 } 1903 1904 int uvc_ctrl_add_mapping(struct uvc_video_chain *chain, 1905 const struct uvc_control_mapping *mapping) 1906 { 1907 struct uvc_device *dev = chain->dev; 1908 struct uvc_control_mapping *map; 1909 struct uvc_entity *entity; 1910 struct uvc_control *ctrl; 1911 int found = 0; 1912 int ret; 1913 1914 if (mapping->id & ~V4L2_CTRL_ID_MASK) { 1915 uvc_trace(UVC_TRACE_CONTROL, "Can't add mapping '%s', control " 1916 "id 0x%08x is invalid.\n", mapping->name, 1917 mapping->id); 1918 return -EINVAL; 1919 } 1920 1921 /* Search for the matching (GUID/CS) control on the current chain */ 1922 list_for_each_entry(entity, &chain->entities, chain) { 1923 unsigned int i; 1924 1925 if (UVC_ENTITY_TYPE(entity) != UVC_VC_EXTENSION_UNIT || 1926 !uvc_entity_match_guid(entity, mapping->entity)) 1927 continue; 1928 1929 for (i = 0; i < entity->ncontrols; ++i) { 1930 ctrl = &entity->controls[i]; 1931 if (ctrl->index == mapping->selector - 1) { 1932 found = 1; 1933 break; 1934 } 1935 } 1936 1937 if (found) 1938 break; 1939 } 1940 if (!found) 1941 return -ENOENT; 1942 1943 if (mutex_lock_interruptible(&chain->ctrl_mutex)) 1944 return -ERESTARTSYS; 1945 1946 /* Perform delayed initialization of XU controls */ 1947 ret = uvc_ctrl_init_xu_ctrl(dev, ctrl); 1948 if (ret < 0) { 1949 ret = -ENOENT; 1950 goto done; 1951 } 1952 1953 list_for_each_entry(map, &ctrl->info.mappings, list) { 1954 if (mapping->id == map->id) { 1955 uvc_trace(UVC_TRACE_CONTROL, "Can't add mapping '%s', " 1956 "control id 0x%08x already exists.\n", 1957 mapping->name, mapping->id); 1958 ret = -EEXIST; 1959 goto done; 1960 } 1961 } 1962 1963 /* Prevent excess memory consumption */ 1964 if (atomic_inc_return(&dev->nmappings) > UVC_MAX_CONTROL_MAPPINGS) { 1965 atomic_dec(&dev->nmappings); 1966 uvc_trace(UVC_TRACE_CONTROL, "Can't add mapping '%s', maximum " 1967 "mappings count (%u) exceeded.\n", mapping->name, 1968 UVC_MAX_CONTROL_MAPPINGS); 1969 ret = -ENOMEM; 1970 goto done; 1971 } 1972 1973 ret = __uvc_ctrl_add_mapping(dev, ctrl, mapping); 1974 if (ret < 0) 1975 atomic_dec(&dev->nmappings); 1976 1977 done: 1978 mutex_unlock(&chain->ctrl_mutex); 1979 return ret; 1980 } 1981 1982 /* 1983 * Prune an entity of its bogus controls using a blacklist. Bogus controls 1984 * are currently the ones that crash the camera or unconditionally return an 1985 * error when queried. 1986 */ 1987 static void uvc_ctrl_prune_entity(struct uvc_device *dev, 1988 struct uvc_entity *entity) 1989 { 1990 struct uvc_ctrl_blacklist { 1991 struct usb_device_id id; 1992 u8 index; 1993 }; 1994 1995 static const struct uvc_ctrl_blacklist processing_blacklist[] = { 1996 { { USB_DEVICE(0x13d3, 0x509b) }, 9 }, /* Gain */ 1997 { { USB_DEVICE(0x1c4f, 0x3000) }, 6 }, /* WB Temperature */ 1998 { { USB_DEVICE(0x5986, 0x0241) }, 2 }, /* Hue */ 1999 }; 2000 static const struct uvc_ctrl_blacklist camera_blacklist[] = { 2001 { { USB_DEVICE(0x06f8, 0x3005) }, 9 }, /* Zoom, Absolute */ 2002 }; 2003 2004 const struct uvc_ctrl_blacklist *blacklist; 2005 unsigned int size; 2006 unsigned int count; 2007 unsigned int i; 2008 u8 *controls; 2009 2010 switch (UVC_ENTITY_TYPE(entity)) { 2011 case UVC_VC_PROCESSING_UNIT: 2012 blacklist = processing_blacklist; 2013 count = ARRAY_SIZE(processing_blacklist); 2014 controls = entity->processing.bmControls; 2015 size = entity->processing.bControlSize; 2016 break; 2017 2018 case UVC_ITT_CAMERA: 2019 blacklist = camera_blacklist; 2020 count = ARRAY_SIZE(camera_blacklist); 2021 controls = entity->camera.bmControls; 2022 size = entity->camera.bControlSize; 2023 break; 2024 2025 default: 2026 return; 2027 } 2028 2029 for (i = 0; i < count; ++i) { 2030 if (!usb_match_one_id(dev->intf, &blacklist[i].id)) 2031 continue; 2032 2033 if (blacklist[i].index >= 8 * size || 2034 !uvc_test_bit(controls, blacklist[i].index)) 2035 continue; 2036 2037 uvc_trace(UVC_TRACE_CONTROL, "%u/%u control is black listed, " 2038 "removing it.\n", entity->id, blacklist[i].index); 2039 2040 uvc_clear_bit(controls, blacklist[i].index); 2041 } 2042 } 2043 2044 /* 2045 * Add control information and hardcoded stock control mappings to the given 2046 * device. 2047 */ 2048 static void uvc_ctrl_init_ctrl(struct uvc_device *dev, struct uvc_control *ctrl) 2049 { 2050 const struct uvc_control_info *info = uvc_ctrls; 2051 const struct uvc_control_info *iend = info + ARRAY_SIZE(uvc_ctrls); 2052 const struct uvc_control_mapping *mapping = uvc_ctrl_mappings; 2053 const struct uvc_control_mapping *mend = 2054 mapping + ARRAY_SIZE(uvc_ctrl_mappings); 2055 2056 /* XU controls initialization requires querying the device for control 2057 * information. As some buggy UVC devices will crash when queried 2058 * repeatedly in a tight loop, delay XU controls initialization until 2059 * first use. 2060 */ 2061 if (UVC_ENTITY_TYPE(ctrl->entity) == UVC_VC_EXTENSION_UNIT) 2062 return; 2063 2064 for (; info < iend; ++info) { 2065 if (uvc_entity_match_guid(ctrl->entity, info->entity) && 2066 ctrl->index == info->index) { 2067 uvc_ctrl_add_info(dev, ctrl, info); 2068 break; 2069 } 2070 } 2071 2072 if (!ctrl->initialized) 2073 return; 2074 2075 for (; mapping < mend; ++mapping) { 2076 if (uvc_entity_match_guid(ctrl->entity, mapping->entity) && 2077 ctrl->info.selector == mapping->selector) 2078 __uvc_ctrl_add_mapping(dev, ctrl, mapping); 2079 } 2080 } 2081 2082 /* 2083 * Initialize device controls. 2084 */ 2085 int uvc_ctrl_init_device(struct uvc_device *dev) 2086 { 2087 struct uvc_entity *entity; 2088 unsigned int i; 2089 2090 /* Walk the entities list and instantiate controls */ 2091 list_for_each_entry(entity, &dev->entities, list) { 2092 struct uvc_control *ctrl; 2093 unsigned int bControlSize = 0, ncontrols; 2094 __u8 *bmControls = NULL; 2095 2096 if (UVC_ENTITY_TYPE(entity) == UVC_VC_EXTENSION_UNIT) { 2097 bmControls = entity->extension.bmControls; 2098 bControlSize = entity->extension.bControlSize; 2099 } else if (UVC_ENTITY_TYPE(entity) == UVC_VC_PROCESSING_UNIT) { 2100 bmControls = entity->processing.bmControls; 2101 bControlSize = entity->processing.bControlSize; 2102 } else if (UVC_ENTITY_TYPE(entity) == UVC_ITT_CAMERA) { 2103 bmControls = entity->camera.bmControls; 2104 bControlSize = entity->camera.bControlSize; 2105 } 2106 2107 /* Remove bogus/blacklisted controls */ 2108 uvc_ctrl_prune_entity(dev, entity); 2109 2110 /* Count supported controls and allocate the controls array */ 2111 ncontrols = memweight(bmControls, bControlSize); 2112 if (ncontrols == 0) 2113 continue; 2114 2115 entity->controls = kcalloc(ncontrols, sizeof(*ctrl), 2116 GFP_KERNEL); 2117 if (entity->controls == NULL) 2118 return -ENOMEM; 2119 entity->ncontrols = ncontrols; 2120 2121 /* Initialize all supported controls */ 2122 ctrl = entity->controls; 2123 for (i = 0; i < bControlSize * 8; ++i) { 2124 if (uvc_test_bit(bmControls, i) == 0) 2125 continue; 2126 2127 ctrl->entity = entity; 2128 ctrl->index = i; 2129 2130 uvc_ctrl_init_ctrl(dev, ctrl); 2131 ctrl++; 2132 } 2133 } 2134 2135 return 0; 2136 } 2137 2138 /* 2139 * Cleanup device controls. 2140 */ 2141 static void uvc_ctrl_cleanup_mappings(struct uvc_device *dev, 2142 struct uvc_control *ctrl) 2143 { 2144 struct uvc_control_mapping *mapping, *nm; 2145 2146 list_for_each_entry_safe(mapping, nm, &ctrl->info.mappings, list) { 2147 list_del(&mapping->list); 2148 kfree(mapping->menu_info); 2149 kfree(mapping); 2150 } 2151 } 2152 2153 void uvc_ctrl_cleanup_device(struct uvc_device *dev) 2154 { 2155 struct uvc_entity *entity; 2156 unsigned int i; 2157 2158 /* Free controls and control mappings for all entities. */ 2159 list_for_each_entry(entity, &dev->entities, list) { 2160 for (i = 0; i < entity->ncontrols; ++i) { 2161 struct uvc_control *ctrl = &entity->controls[i]; 2162 2163 if (!ctrl->initialized) 2164 continue; 2165 2166 uvc_ctrl_cleanup_mappings(dev, ctrl); 2167 kfree(ctrl->uvc_data); 2168 } 2169 2170 kfree(entity->controls); 2171 } 2172 } 2173