1 /* 2 * uvc_v4l2.c -- USB Video Class driver - V4L2 API 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/compat.h> 15 #include <linux/kernel.h> 16 #include <linux/version.h> 17 #include <linux/list.h> 18 #include <linux/module.h> 19 #include <linux/slab.h> 20 #include <linux/usb.h> 21 #include <linux/videodev2.h> 22 #include <linux/vmalloc.h> 23 #include <linux/mm.h> 24 #include <linux/wait.h> 25 #include <linux/atomic.h> 26 27 #include <media/v4l2-common.h> 28 #include <media/v4l2-ctrls.h> 29 #include <media/v4l2-event.h> 30 #include <media/v4l2-ioctl.h> 31 32 #include "uvcvideo.h" 33 34 /* ------------------------------------------------------------------------ 35 * UVC ioctls 36 */ 37 static int uvc_ioctl_ctrl_map(struct uvc_video_chain *chain, 38 struct uvc_xu_control_mapping *xmap) 39 { 40 struct uvc_control_mapping *map; 41 unsigned int size; 42 int ret; 43 44 map = kzalloc(sizeof *map, GFP_KERNEL); 45 if (map == NULL) 46 return -ENOMEM; 47 48 map->id = xmap->id; 49 memcpy(map->name, xmap->name, sizeof map->name); 50 memcpy(map->entity, xmap->entity, sizeof map->entity); 51 map->selector = xmap->selector; 52 map->size = xmap->size; 53 map->offset = xmap->offset; 54 map->v4l2_type = xmap->v4l2_type; 55 map->data_type = xmap->data_type; 56 57 switch (xmap->v4l2_type) { 58 case V4L2_CTRL_TYPE_INTEGER: 59 case V4L2_CTRL_TYPE_BOOLEAN: 60 case V4L2_CTRL_TYPE_BUTTON: 61 break; 62 63 case V4L2_CTRL_TYPE_MENU: 64 /* Prevent excessive memory consumption, as well as integer 65 * overflows. 66 */ 67 if (xmap->menu_count == 0 || 68 xmap->menu_count > UVC_MAX_CONTROL_MENU_ENTRIES) { 69 ret = -EINVAL; 70 goto done; 71 } 72 73 size = xmap->menu_count * sizeof(*map->menu_info); 74 map->menu_info = kmalloc(size, GFP_KERNEL); 75 if (map->menu_info == NULL) { 76 ret = -ENOMEM; 77 goto done; 78 } 79 80 if (copy_from_user(map->menu_info, xmap->menu_info, size)) { 81 ret = -EFAULT; 82 goto done; 83 } 84 85 map->menu_count = xmap->menu_count; 86 break; 87 88 default: 89 uvc_trace(UVC_TRACE_CONTROL, "Unsupported V4L2 control type " 90 "%u.\n", xmap->v4l2_type); 91 ret = -ENOTTY; 92 goto done; 93 } 94 95 ret = uvc_ctrl_add_mapping(chain, map); 96 97 done: 98 kfree(map->menu_info); 99 kfree(map); 100 101 return ret; 102 } 103 104 /* ------------------------------------------------------------------------ 105 * V4L2 interface 106 */ 107 108 /* 109 * Find the frame interval closest to the requested frame interval for the 110 * given frame format and size. This should be done by the device as part of 111 * the Video Probe and Commit negotiation, but some hardware don't implement 112 * that feature. 113 */ 114 static __u32 uvc_try_frame_interval(struct uvc_frame *frame, __u32 interval) 115 { 116 unsigned int i; 117 118 if (frame->bFrameIntervalType) { 119 __u32 best = -1, dist; 120 121 for (i = 0; i < frame->bFrameIntervalType; ++i) { 122 dist = interval > frame->dwFrameInterval[i] 123 ? interval - frame->dwFrameInterval[i] 124 : frame->dwFrameInterval[i] - interval; 125 126 if (dist > best) 127 break; 128 129 best = dist; 130 } 131 132 interval = frame->dwFrameInterval[i-1]; 133 } else { 134 const __u32 min = frame->dwFrameInterval[0]; 135 const __u32 max = frame->dwFrameInterval[1]; 136 const __u32 step = frame->dwFrameInterval[2]; 137 138 interval = min + (interval - min + step/2) / step * step; 139 if (interval > max) 140 interval = max; 141 } 142 143 return interval; 144 } 145 146 static int uvc_v4l2_try_format(struct uvc_streaming *stream, 147 struct v4l2_format *fmt, struct uvc_streaming_control *probe, 148 struct uvc_format **uvc_format, struct uvc_frame **uvc_frame) 149 { 150 struct uvc_format *format = NULL; 151 struct uvc_frame *frame = NULL; 152 __u16 rw, rh; 153 unsigned int d, maxd; 154 unsigned int i; 155 __u32 interval; 156 int ret = 0; 157 __u8 *fcc; 158 159 if (fmt->type != stream->type) 160 return -EINVAL; 161 162 fcc = (__u8 *)&fmt->fmt.pix.pixelformat; 163 uvc_trace(UVC_TRACE_FORMAT, "Trying format 0x%08x (%c%c%c%c): %ux%u.\n", 164 fmt->fmt.pix.pixelformat, 165 fcc[0], fcc[1], fcc[2], fcc[3], 166 fmt->fmt.pix.width, fmt->fmt.pix.height); 167 168 /* Check if the hardware supports the requested format, use the default 169 * format otherwise. 170 */ 171 for (i = 0; i < stream->nformats; ++i) { 172 format = &stream->format[i]; 173 if (format->fcc == fmt->fmt.pix.pixelformat) 174 break; 175 } 176 177 if (i == stream->nformats) { 178 format = stream->def_format; 179 fmt->fmt.pix.pixelformat = format->fcc; 180 } 181 182 /* Find the closest image size. The distance between image sizes is 183 * the size in pixels of the non-overlapping regions between the 184 * requested size and the frame-specified size. 185 */ 186 rw = fmt->fmt.pix.width; 187 rh = fmt->fmt.pix.height; 188 maxd = (unsigned int)-1; 189 190 for (i = 0; i < format->nframes; ++i) { 191 __u16 w = format->frame[i].wWidth; 192 __u16 h = format->frame[i].wHeight; 193 194 d = min(w, rw) * min(h, rh); 195 d = w*h + rw*rh - 2*d; 196 if (d < maxd) { 197 maxd = d; 198 frame = &format->frame[i]; 199 } 200 201 if (maxd == 0) 202 break; 203 } 204 205 if (frame == NULL) { 206 uvc_trace(UVC_TRACE_FORMAT, "Unsupported size %ux%u.\n", 207 fmt->fmt.pix.width, fmt->fmt.pix.height); 208 return -EINVAL; 209 } 210 211 /* Use the default frame interval. */ 212 interval = frame->dwDefaultFrameInterval; 213 uvc_trace(UVC_TRACE_FORMAT, "Using default frame interval %u.%u us " 214 "(%u.%u fps).\n", interval/10, interval%10, 10000000/interval, 215 (100000000/interval)%10); 216 217 /* Set the format index, frame index and frame interval. */ 218 memset(probe, 0, sizeof *probe); 219 probe->bmHint = 1; /* dwFrameInterval */ 220 probe->bFormatIndex = format->index; 221 probe->bFrameIndex = frame->bFrameIndex; 222 probe->dwFrameInterval = uvc_try_frame_interval(frame, interval); 223 /* Some webcams stall the probe control set request when the 224 * dwMaxVideoFrameSize field is set to zero. The UVC specification 225 * clearly states that the field is read-only from the host, so this 226 * is a webcam bug. Set dwMaxVideoFrameSize to the value reported by 227 * the webcam to work around the problem. 228 * 229 * The workaround could probably be enabled for all webcams, so the 230 * quirk can be removed if needed. It's currently useful to detect 231 * webcam bugs and fix them before they hit the market (providing 232 * developers test their webcams with the Linux driver as well as with 233 * the Windows driver). 234 */ 235 mutex_lock(&stream->mutex); 236 if (stream->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS) 237 probe->dwMaxVideoFrameSize = 238 stream->ctrl.dwMaxVideoFrameSize; 239 240 /* Probe the device. */ 241 ret = uvc_probe_video(stream, probe); 242 mutex_unlock(&stream->mutex); 243 if (ret < 0) 244 goto done; 245 246 fmt->fmt.pix.width = frame->wWidth; 247 fmt->fmt.pix.height = frame->wHeight; 248 fmt->fmt.pix.field = V4L2_FIELD_NONE; 249 fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8; 250 fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize; 251 fmt->fmt.pix.colorspace = format->colorspace; 252 fmt->fmt.pix.priv = 0; 253 254 if (uvc_format != NULL) 255 *uvc_format = format; 256 if (uvc_frame != NULL) 257 *uvc_frame = frame; 258 259 done: 260 return ret; 261 } 262 263 static int uvc_v4l2_get_format(struct uvc_streaming *stream, 264 struct v4l2_format *fmt) 265 { 266 struct uvc_format *format; 267 struct uvc_frame *frame; 268 int ret = 0; 269 270 if (fmt->type != stream->type) 271 return -EINVAL; 272 273 mutex_lock(&stream->mutex); 274 format = stream->cur_format; 275 frame = stream->cur_frame; 276 277 if (format == NULL || frame == NULL) { 278 ret = -EINVAL; 279 goto done; 280 } 281 282 fmt->fmt.pix.pixelformat = format->fcc; 283 fmt->fmt.pix.width = frame->wWidth; 284 fmt->fmt.pix.height = frame->wHeight; 285 fmt->fmt.pix.field = V4L2_FIELD_NONE; 286 fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8; 287 fmt->fmt.pix.sizeimage = stream->ctrl.dwMaxVideoFrameSize; 288 fmt->fmt.pix.colorspace = format->colorspace; 289 fmt->fmt.pix.priv = 0; 290 291 done: 292 mutex_unlock(&stream->mutex); 293 return ret; 294 } 295 296 static int uvc_v4l2_set_format(struct uvc_streaming *stream, 297 struct v4l2_format *fmt) 298 { 299 struct uvc_streaming_control probe; 300 struct uvc_format *format; 301 struct uvc_frame *frame; 302 int ret; 303 304 if (fmt->type != stream->type) 305 return -EINVAL; 306 307 ret = uvc_v4l2_try_format(stream, fmt, &probe, &format, &frame); 308 if (ret < 0) 309 return ret; 310 311 mutex_lock(&stream->mutex); 312 313 if (uvc_queue_allocated(&stream->queue)) { 314 ret = -EBUSY; 315 goto done; 316 } 317 318 stream->ctrl = probe; 319 stream->cur_format = format; 320 stream->cur_frame = frame; 321 322 done: 323 mutex_unlock(&stream->mutex); 324 return ret; 325 } 326 327 static int uvc_v4l2_get_streamparm(struct uvc_streaming *stream, 328 struct v4l2_streamparm *parm) 329 { 330 uint32_t numerator, denominator; 331 332 if (parm->type != stream->type) 333 return -EINVAL; 334 335 mutex_lock(&stream->mutex); 336 numerator = stream->ctrl.dwFrameInterval; 337 mutex_unlock(&stream->mutex); 338 339 denominator = 10000000; 340 uvc_simplify_fraction(&numerator, &denominator, 8, 333); 341 342 memset(parm, 0, sizeof *parm); 343 parm->type = stream->type; 344 345 if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) { 346 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME; 347 parm->parm.capture.capturemode = 0; 348 parm->parm.capture.timeperframe.numerator = numerator; 349 parm->parm.capture.timeperframe.denominator = denominator; 350 parm->parm.capture.extendedmode = 0; 351 parm->parm.capture.readbuffers = 0; 352 } else { 353 parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME; 354 parm->parm.output.outputmode = 0; 355 parm->parm.output.timeperframe.numerator = numerator; 356 parm->parm.output.timeperframe.denominator = denominator; 357 } 358 359 return 0; 360 } 361 362 static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream, 363 struct v4l2_streamparm *parm) 364 { 365 struct uvc_streaming_control probe; 366 struct v4l2_fract timeperframe; 367 uint32_t interval; 368 int ret; 369 370 if (parm->type != stream->type) 371 return -EINVAL; 372 373 if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) 374 timeperframe = parm->parm.capture.timeperframe; 375 else 376 timeperframe = parm->parm.output.timeperframe; 377 378 interval = uvc_fraction_to_interval(timeperframe.numerator, 379 timeperframe.denominator); 380 uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n", 381 timeperframe.numerator, timeperframe.denominator, interval); 382 383 mutex_lock(&stream->mutex); 384 385 if (uvc_queue_streaming(&stream->queue)) { 386 mutex_unlock(&stream->mutex); 387 return -EBUSY; 388 } 389 390 probe = stream->ctrl; 391 probe.dwFrameInterval = 392 uvc_try_frame_interval(stream->cur_frame, interval); 393 394 /* Probe the device with the new settings. */ 395 ret = uvc_probe_video(stream, &probe); 396 if (ret < 0) { 397 mutex_unlock(&stream->mutex); 398 return ret; 399 } 400 401 stream->ctrl = probe; 402 mutex_unlock(&stream->mutex); 403 404 /* Return the actual frame period. */ 405 timeperframe.numerator = probe.dwFrameInterval; 406 timeperframe.denominator = 10000000; 407 uvc_simplify_fraction(&timeperframe.numerator, 408 &timeperframe.denominator, 8, 333); 409 410 if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) 411 parm->parm.capture.timeperframe = timeperframe; 412 else 413 parm->parm.output.timeperframe = timeperframe; 414 415 return 0; 416 } 417 418 /* ------------------------------------------------------------------------ 419 * Privilege management 420 */ 421 422 /* 423 * Privilege management is the multiple-open implementation basis. The current 424 * implementation is completely transparent for the end-user and doesn't 425 * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls. 426 * Those ioctls enable finer control on the device (by making possible for a 427 * user to request exclusive access to a device), but are not mature yet. 428 * Switching to the V4L2 priority mechanism might be considered in the future 429 * if this situation changes. 430 * 431 * Each open instance of a UVC device can either be in a privileged or 432 * unprivileged state. Only a single instance can be in a privileged state at 433 * a given time. Trying to perform an operation that requires privileges will 434 * automatically acquire the required privileges if possible, or return -EBUSY 435 * otherwise. Privileges are dismissed when closing the instance or when 436 * freeing the video buffers using VIDIOC_REQBUFS. 437 * 438 * Operations that require privileges are: 439 * 440 * - VIDIOC_S_INPUT 441 * - VIDIOC_S_PARM 442 * - VIDIOC_S_FMT 443 * - VIDIOC_REQBUFS 444 */ 445 static int uvc_acquire_privileges(struct uvc_fh *handle) 446 { 447 /* Always succeed if the handle is already privileged. */ 448 if (handle->state == UVC_HANDLE_ACTIVE) 449 return 0; 450 451 /* Check if the device already has a privileged handle. */ 452 if (atomic_inc_return(&handle->stream->active) != 1) { 453 atomic_dec(&handle->stream->active); 454 return -EBUSY; 455 } 456 457 handle->state = UVC_HANDLE_ACTIVE; 458 return 0; 459 } 460 461 static void uvc_dismiss_privileges(struct uvc_fh *handle) 462 { 463 if (handle->state == UVC_HANDLE_ACTIVE) 464 atomic_dec(&handle->stream->active); 465 466 handle->state = UVC_HANDLE_PASSIVE; 467 } 468 469 static int uvc_has_privileges(struct uvc_fh *handle) 470 { 471 return handle->state == UVC_HANDLE_ACTIVE; 472 } 473 474 /* ------------------------------------------------------------------------ 475 * V4L2 file operations 476 */ 477 478 static int uvc_v4l2_open(struct file *file) 479 { 480 struct uvc_streaming *stream; 481 struct uvc_fh *handle; 482 int ret = 0; 483 484 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n"); 485 stream = video_drvdata(file); 486 487 if (stream->dev->state & UVC_DEV_DISCONNECTED) 488 return -ENODEV; 489 490 ret = usb_autopm_get_interface(stream->dev->intf); 491 if (ret < 0) 492 return ret; 493 494 /* Create the device handle. */ 495 handle = kzalloc(sizeof *handle, GFP_KERNEL); 496 if (handle == NULL) { 497 usb_autopm_put_interface(stream->dev->intf); 498 return -ENOMEM; 499 } 500 501 if (atomic_inc_return(&stream->dev->users) == 1) { 502 ret = uvc_status_start(stream->dev); 503 if (ret < 0) { 504 atomic_dec(&stream->dev->users); 505 usb_autopm_put_interface(stream->dev->intf); 506 kfree(handle); 507 return ret; 508 } 509 } 510 511 v4l2_fh_init(&handle->vfh, stream->vdev); 512 v4l2_fh_add(&handle->vfh); 513 handle->chain = stream->chain; 514 handle->stream = stream; 515 handle->state = UVC_HANDLE_PASSIVE; 516 file->private_data = handle; 517 518 return 0; 519 } 520 521 static int uvc_v4l2_release(struct file *file) 522 { 523 struct uvc_fh *handle = file->private_data; 524 struct uvc_streaming *stream = handle->stream; 525 526 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n"); 527 528 /* Only free resources if this is a privileged handle. */ 529 if (uvc_has_privileges(handle)) { 530 uvc_video_enable(stream, 0); 531 uvc_free_buffers(&stream->queue); 532 } 533 534 /* Release the file handle. */ 535 uvc_dismiss_privileges(handle); 536 v4l2_fh_del(&handle->vfh); 537 v4l2_fh_exit(&handle->vfh); 538 kfree(handle); 539 file->private_data = NULL; 540 541 if (atomic_dec_return(&stream->dev->users) == 0) 542 uvc_status_stop(stream->dev); 543 544 usb_autopm_put_interface(stream->dev->intf); 545 return 0; 546 } 547 548 static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg) 549 { 550 struct video_device *vdev = video_devdata(file); 551 struct uvc_fh *handle = file->private_data; 552 struct uvc_video_chain *chain = handle->chain; 553 struct uvc_streaming *stream = handle->stream; 554 long ret = 0; 555 556 switch (cmd) { 557 /* Query capabilities */ 558 case VIDIOC_QUERYCAP: 559 { 560 struct v4l2_capability *cap = arg; 561 562 memset(cap, 0, sizeof *cap); 563 strlcpy(cap->driver, "uvcvideo", sizeof cap->driver); 564 strlcpy(cap->card, vdev->name, sizeof cap->card); 565 usb_make_path(stream->dev->udev, 566 cap->bus_info, sizeof(cap->bus_info)); 567 cap->version = LINUX_VERSION_CODE; 568 cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING 569 | chain->caps; 570 if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) 571 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE 572 | V4L2_CAP_STREAMING; 573 else 574 cap->device_caps = V4L2_CAP_VIDEO_OUTPUT 575 | V4L2_CAP_STREAMING; 576 break; 577 } 578 579 /* Priority */ 580 case VIDIOC_G_PRIORITY: 581 *(u32 *)arg = v4l2_prio_max(vdev->prio); 582 break; 583 584 case VIDIOC_S_PRIORITY: 585 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio); 586 if (ret < 0) 587 return ret; 588 589 return v4l2_prio_change(vdev->prio, &handle->vfh.prio, 590 *(u32 *)arg); 591 592 /* Get, Set & Query control */ 593 case VIDIOC_QUERYCTRL: 594 return uvc_query_v4l2_ctrl(chain, arg); 595 596 case VIDIOC_G_CTRL: 597 { 598 struct v4l2_control *ctrl = arg; 599 struct v4l2_ext_control xctrl; 600 601 memset(&xctrl, 0, sizeof xctrl); 602 xctrl.id = ctrl->id; 603 604 ret = uvc_ctrl_begin(chain); 605 if (ret < 0) 606 return ret; 607 608 ret = uvc_ctrl_get(chain, &xctrl); 609 uvc_ctrl_rollback(handle); 610 if (ret >= 0) 611 ctrl->value = xctrl.value; 612 break; 613 } 614 615 case VIDIOC_S_CTRL: 616 { 617 struct v4l2_control *ctrl = arg; 618 struct v4l2_ext_control xctrl; 619 620 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio); 621 if (ret < 0) 622 return ret; 623 624 memset(&xctrl, 0, sizeof xctrl); 625 xctrl.id = ctrl->id; 626 xctrl.value = ctrl->value; 627 628 ret = uvc_ctrl_begin(chain); 629 if (ret < 0) 630 return ret; 631 632 ret = uvc_ctrl_set(chain, &xctrl); 633 if (ret < 0) { 634 uvc_ctrl_rollback(handle); 635 return ret; 636 } 637 ret = uvc_ctrl_commit(handle, &xctrl, 1); 638 if (ret == 0) 639 ctrl->value = xctrl.value; 640 break; 641 } 642 643 case VIDIOC_QUERYMENU: 644 return uvc_query_v4l2_menu(chain, arg); 645 646 case VIDIOC_G_EXT_CTRLS: 647 { 648 struct v4l2_ext_controls *ctrls = arg; 649 struct v4l2_ext_control *ctrl = ctrls->controls; 650 unsigned int i; 651 652 ret = uvc_ctrl_begin(chain); 653 if (ret < 0) 654 return ret; 655 656 for (i = 0; i < ctrls->count; ++ctrl, ++i) { 657 ret = uvc_ctrl_get(chain, ctrl); 658 if (ret < 0) { 659 uvc_ctrl_rollback(handle); 660 ctrls->error_idx = i; 661 return ret; 662 } 663 } 664 ctrls->error_idx = 0; 665 ret = uvc_ctrl_rollback(handle); 666 break; 667 } 668 669 case VIDIOC_S_EXT_CTRLS: 670 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio); 671 if (ret < 0) 672 return ret; 673 /* Fall through */ 674 case VIDIOC_TRY_EXT_CTRLS: 675 { 676 struct v4l2_ext_controls *ctrls = arg; 677 struct v4l2_ext_control *ctrl = ctrls->controls; 678 unsigned int i; 679 680 ret = uvc_ctrl_begin(chain); 681 if (ret < 0) 682 return ret; 683 684 for (i = 0; i < ctrls->count; ++ctrl, ++i) { 685 ret = uvc_ctrl_set(chain, ctrl); 686 if (ret < 0) { 687 uvc_ctrl_rollback(handle); 688 ctrls->error_idx = cmd == VIDIOC_S_EXT_CTRLS 689 ? ctrls->count : i; 690 return ret; 691 } 692 } 693 694 ctrls->error_idx = 0; 695 696 if (cmd == VIDIOC_S_EXT_CTRLS) 697 ret = uvc_ctrl_commit(handle, 698 ctrls->controls, ctrls->count); 699 else 700 ret = uvc_ctrl_rollback(handle); 701 break; 702 } 703 704 /* Get, Set & Enum input */ 705 case VIDIOC_ENUMINPUT: 706 { 707 const struct uvc_entity *selector = chain->selector; 708 struct v4l2_input *input = arg; 709 struct uvc_entity *iterm = NULL; 710 u32 index = input->index; 711 int pin = 0; 712 713 if (selector == NULL || 714 (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) { 715 if (index != 0) 716 return -EINVAL; 717 list_for_each_entry(iterm, &chain->entities, chain) { 718 if (UVC_ENTITY_IS_ITERM(iterm)) 719 break; 720 } 721 pin = iterm->id; 722 } else if (index < selector->bNrInPins) { 723 pin = selector->baSourceID[index]; 724 list_for_each_entry(iterm, &chain->entities, chain) { 725 if (!UVC_ENTITY_IS_ITERM(iterm)) 726 continue; 727 if (iterm->id == pin) 728 break; 729 } 730 } 731 732 if (iterm == NULL || iterm->id != pin) 733 return -EINVAL; 734 735 memset(input, 0, sizeof *input); 736 input->index = index; 737 strlcpy(input->name, iterm->name, sizeof input->name); 738 if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA) 739 input->type = V4L2_INPUT_TYPE_CAMERA; 740 break; 741 } 742 743 case VIDIOC_G_INPUT: 744 { 745 u8 input; 746 747 if (chain->selector == NULL || 748 (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) { 749 *(int *)arg = 0; 750 break; 751 } 752 753 ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR, 754 chain->selector->id, chain->dev->intfnum, 755 UVC_SU_INPUT_SELECT_CONTROL, &input, 1); 756 if (ret < 0) 757 return ret; 758 759 *(int *)arg = input - 1; 760 break; 761 } 762 763 case VIDIOC_S_INPUT: 764 { 765 u32 input = *(u32 *)arg + 1; 766 767 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio); 768 if (ret < 0) 769 return ret; 770 771 if ((ret = uvc_acquire_privileges(handle)) < 0) 772 return ret; 773 774 if (chain->selector == NULL || 775 (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) { 776 if (input != 1) 777 return -EINVAL; 778 break; 779 } 780 781 if (input == 0 || input > chain->selector->bNrInPins) 782 return -EINVAL; 783 784 return uvc_query_ctrl(chain->dev, UVC_SET_CUR, 785 chain->selector->id, chain->dev->intfnum, 786 UVC_SU_INPUT_SELECT_CONTROL, &input, 1); 787 } 788 789 /* Try, Get, Set & Enum format */ 790 case VIDIOC_ENUM_FMT: 791 { 792 struct v4l2_fmtdesc *fmt = arg; 793 struct uvc_format *format; 794 enum v4l2_buf_type type = fmt->type; 795 __u32 index = fmt->index; 796 797 if (fmt->type != stream->type || 798 fmt->index >= stream->nformats) 799 return -EINVAL; 800 801 memset(fmt, 0, sizeof(*fmt)); 802 fmt->index = index; 803 fmt->type = type; 804 805 format = &stream->format[fmt->index]; 806 fmt->flags = 0; 807 if (format->flags & UVC_FMT_FLAG_COMPRESSED) 808 fmt->flags |= V4L2_FMT_FLAG_COMPRESSED; 809 strlcpy(fmt->description, format->name, 810 sizeof fmt->description); 811 fmt->description[sizeof fmt->description - 1] = 0; 812 fmt->pixelformat = format->fcc; 813 break; 814 } 815 816 case VIDIOC_TRY_FMT: 817 { 818 struct uvc_streaming_control probe; 819 820 return uvc_v4l2_try_format(stream, arg, &probe, NULL, NULL); 821 } 822 823 case VIDIOC_S_FMT: 824 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio); 825 if (ret < 0) 826 return ret; 827 828 if ((ret = uvc_acquire_privileges(handle)) < 0) 829 return ret; 830 831 return uvc_v4l2_set_format(stream, arg); 832 833 case VIDIOC_G_FMT: 834 return uvc_v4l2_get_format(stream, arg); 835 836 /* Frame size enumeration */ 837 case VIDIOC_ENUM_FRAMESIZES: 838 { 839 struct v4l2_frmsizeenum *fsize = arg; 840 struct uvc_format *format = NULL; 841 struct uvc_frame *frame; 842 int i; 843 844 /* Look for the given pixel format */ 845 for (i = 0; i < stream->nformats; i++) { 846 if (stream->format[i].fcc == 847 fsize->pixel_format) { 848 format = &stream->format[i]; 849 break; 850 } 851 } 852 if (format == NULL) 853 return -EINVAL; 854 855 if (fsize->index >= format->nframes) 856 return -EINVAL; 857 858 frame = &format->frame[fsize->index]; 859 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE; 860 fsize->discrete.width = frame->wWidth; 861 fsize->discrete.height = frame->wHeight; 862 break; 863 } 864 865 /* Frame interval enumeration */ 866 case VIDIOC_ENUM_FRAMEINTERVALS: 867 { 868 struct v4l2_frmivalenum *fival = arg; 869 struct uvc_format *format = NULL; 870 struct uvc_frame *frame = NULL; 871 int i; 872 873 /* Look for the given pixel format and frame size */ 874 for (i = 0; i < stream->nformats; i++) { 875 if (stream->format[i].fcc == 876 fival->pixel_format) { 877 format = &stream->format[i]; 878 break; 879 } 880 } 881 if (format == NULL) 882 return -EINVAL; 883 884 for (i = 0; i < format->nframes; i++) { 885 if (format->frame[i].wWidth == fival->width && 886 format->frame[i].wHeight == fival->height) { 887 frame = &format->frame[i]; 888 break; 889 } 890 } 891 if (frame == NULL) 892 return -EINVAL; 893 894 if (frame->bFrameIntervalType) { 895 if (fival->index >= frame->bFrameIntervalType) 896 return -EINVAL; 897 898 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE; 899 fival->discrete.numerator = 900 frame->dwFrameInterval[fival->index]; 901 fival->discrete.denominator = 10000000; 902 uvc_simplify_fraction(&fival->discrete.numerator, 903 &fival->discrete.denominator, 8, 333); 904 } else { 905 fival->type = V4L2_FRMIVAL_TYPE_STEPWISE; 906 fival->stepwise.min.numerator = 907 frame->dwFrameInterval[0]; 908 fival->stepwise.min.denominator = 10000000; 909 fival->stepwise.max.numerator = 910 frame->dwFrameInterval[1]; 911 fival->stepwise.max.denominator = 10000000; 912 fival->stepwise.step.numerator = 913 frame->dwFrameInterval[2]; 914 fival->stepwise.step.denominator = 10000000; 915 uvc_simplify_fraction(&fival->stepwise.min.numerator, 916 &fival->stepwise.min.denominator, 8, 333); 917 uvc_simplify_fraction(&fival->stepwise.max.numerator, 918 &fival->stepwise.max.denominator, 8, 333); 919 uvc_simplify_fraction(&fival->stepwise.step.numerator, 920 &fival->stepwise.step.denominator, 8, 333); 921 } 922 break; 923 } 924 925 /* Get & Set streaming parameters */ 926 case VIDIOC_G_PARM: 927 return uvc_v4l2_get_streamparm(stream, arg); 928 929 case VIDIOC_S_PARM: 930 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio); 931 if (ret < 0) 932 return ret; 933 934 if ((ret = uvc_acquire_privileges(handle)) < 0) 935 return ret; 936 937 return uvc_v4l2_set_streamparm(stream, arg); 938 939 /* Cropping and scaling */ 940 case VIDIOC_CROPCAP: 941 { 942 struct v4l2_cropcap *ccap = arg; 943 944 if (ccap->type != stream->type) 945 return -EINVAL; 946 947 ccap->bounds.left = 0; 948 ccap->bounds.top = 0; 949 950 mutex_lock(&stream->mutex); 951 ccap->bounds.width = stream->cur_frame->wWidth; 952 ccap->bounds.height = stream->cur_frame->wHeight; 953 mutex_unlock(&stream->mutex); 954 955 ccap->defrect = ccap->bounds; 956 957 ccap->pixelaspect.numerator = 1; 958 ccap->pixelaspect.denominator = 1; 959 break; 960 } 961 962 case VIDIOC_G_CROP: 963 case VIDIOC_S_CROP: 964 return -ENOTTY; 965 966 /* Buffers & streaming */ 967 case VIDIOC_REQBUFS: 968 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio); 969 if (ret < 0) 970 return ret; 971 972 if ((ret = uvc_acquire_privileges(handle)) < 0) 973 return ret; 974 975 mutex_lock(&stream->mutex); 976 ret = uvc_alloc_buffers(&stream->queue, arg); 977 mutex_unlock(&stream->mutex); 978 if (ret < 0) 979 return ret; 980 981 if (ret == 0) 982 uvc_dismiss_privileges(handle); 983 984 ret = 0; 985 break; 986 987 case VIDIOC_QUERYBUF: 988 { 989 struct v4l2_buffer *buf = arg; 990 991 if (!uvc_has_privileges(handle)) 992 return -EBUSY; 993 994 return uvc_query_buffer(&stream->queue, buf); 995 } 996 997 case VIDIOC_QBUF: 998 if (!uvc_has_privileges(handle)) 999 return -EBUSY; 1000 1001 return uvc_queue_buffer(&stream->queue, arg); 1002 1003 case VIDIOC_DQBUF: 1004 if (!uvc_has_privileges(handle)) 1005 return -EBUSY; 1006 1007 return uvc_dequeue_buffer(&stream->queue, arg, 1008 file->f_flags & O_NONBLOCK); 1009 1010 case VIDIOC_STREAMON: 1011 { 1012 int *type = arg; 1013 1014 if (*type != stream->type) 1015 return -EINVAL; 1016 1017 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio); 1018 if (ret < 0) 1019 return ret; 1020 1021 if (!uvc_has_privileges(handle)) 1022 return -EBUSY; 1023 1024 mutex_lock(&stream->mutex); 1025 ret = uvc_video_enable(stream, 1); 1026 mutex_unlock(&stream->mutex); 1027 if (ret < 0) 1028 return ret; 1029 break; 1030 } 1031 1032 case VIDIOC_STREAMOFF: 1033 { 1034 int *type = arg; 1035 1036 if (*type != stream->type) 1037 return -EINVAL; 1038 1039 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio); 1040 if (ret < 0) 1041 return ret; 1042 1043 if (!uvc_has_privileges(handle)) 1044 return -EBUSY; 1045 1046 return uvc_video_enable(stream, 0); 1047 } 1048 1049 case VIDIOC_SUBSCRIBE_EVENT: 1050 { 1051 struct v4l2_event_subscription *sub = arg; 1052 1053 switch (sub->type) { 1054 case V4L2_EVENT_CTRL: 1055 return v4l2_event_subscribe(&handle->vfh, sub, 0, 1056 &uvc_ctrl_sub_ev_ops); 1057 default: 1058 return -EINVAL; 1059 } 1060 } 1061 1062 case VIDIOC_UNSUBSCRIBE_EVENT: 1063 return v4l2_event_unsubscribe(&handle->vfh, arg); 1064 1065 case VIDIOC_DQEVENT: 1066 return v4l2_event_dequeue(&handle->vfh, arg, 1067 file->f_flags & O_NONBLOCK); 1068 1069 /* Analog video standards make no sense for digital cameras. */ 1070 case VIDIOC_ENUMSTD: 1071 case VIDIOC_QUERYSTD: 1072 case VIDIOC_G_STD: 1073 case VIDIOC_S_STD: 1074 1075 case VIDIOC_OVERLAY: 1076 1077 case VIDIOC_ENUMAUDIO: 1078 case VIDIOC_ENUMAUDOUT: 1079 1080 case VIDIOC_ENUMOUTPUT: 1081 uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd); 1082 return -ENOTTY; 1083 1084 case UVCIOC_CTRL_MAP: 1085 return uvc_ioctl_ctrl_map(chain, arg); 1086 1087 case UVCIOC_CTRL_QUERY: 1088 return uvc_xu_ctrl_query(chain, arg); 1089 1090 default: 1091 uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n", cmd); 1092 return -ENOTTY; 1093 } 1094 1095 return ret; 1096 } 1097 1098 static long uvc_v4l2_ioctl(struct file *file, 1099 unsigned int cmd, unsigned long arg) 1100 { 1101 if (uvc_trace_param & UVC_TRACE_IOCTL) { 1102 uvc_printk(KERN_DEBUG, "uvc_v4l2_ioctl("); 1103 v4l_printk_ioctl(NULL, cmd); 1104 printk(")\n"); 1105 } 1106 1107 return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl); 1108 } 1109 1110 #ifdef CONFIG_COMPAT 1111 struct uvc_xu_control_mapping32 { 1112 __u32 id; 1113 __u8 name[32]; 1114 __u8 entity[16]; 1115 __u8 selector; 1116 1117 __u8 size; 1118 __u8 offset; 1119 __u32 v4l2_type; 1120 __u32 data_type; 1121 1122 compat_caddr_t menu_info; 1123 __u32 menu_count; 1124 1125 __u32 reserved[4]; 1126 }; 1127 1128 static int uvc_v4l2_get_xu_mapping(struct uvc_xu_control_mapping *kp, 1129 const struct uvc_xu_control_mapping32 __user *up) 1130 { 1131 struct uvc_menu_info __user *umenus; 1132 struct uvc_menu_info __user *kmenus; 1133 compat_caddr_t p; 1134 1135 if (!access_ok(VERIFY_READ, up, sizeof(*up)) || 1136 __copy_from_user(kp, up, offsetof(typeof(*up), menu_info)) || 1137 __get_user(kp->menu_count, &up->menu_count)) 1138 return -EFAULT; 1139 1140 memset(kp->reserved, 0, sizeof(kp->reserved)); 1141 1142 if (kp->menu_count == 0) { 1143 kp->menu_info = NULL; 1144 return 0; 1145 } 1146 1147 if (__get_user(p, &up->menu_info)) 1148 return -EFAULT; 1149 umenus = compat_ptr(p); 1150 if (!access_ok(VERIFY_READ, umenus, kp->menu_count * sizeof(*umenus))) 1151 return -EFAULT; 1152 1153 kmenus = compat_alloc_user_space(kp->menu_count * sizeof(*kmenus)); 1154 if (kmenus == NULL) 1155 return -EFAULT; 1156 kp->menu_info = kmenus; 1157 1158 if (copy_in_user(kmenus, umenus, kp->menu_count * sizeof(*umenus))) 1159 return -EFAULT; 1160 1161 return 0; 1162 } 1163 1164 static int uvc_v4l2_put_xu_mapping(const struct uvc_xu_control_mapping *kp, 1165 struct uvc_xu_control_mapping32 __user *up) 1166 { 1167 struct uvc_menu_info __user *umenus; 1168 struct uvc_menu_info __user *kmenus = kp->menu_info; 1169 compat_caddr_t p; 1170 1171 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) || 1172 __copy_to_user(up, kp, offsetof(typeof(*up), menu_info)) || 1173 __put_user(kp->menu_count, &up->menu_count)) 1174 return -EFAULT; 1175 1176 if (__clear_user(up->reserved, sizeof(up->reserved))) 1177 return -EFAULT; 1178 1179 if (kp->menu_count == 0) 1180 return 0; 1181 1182 if (get_user(p, &up->menu_info)) 1183 return -EFAULT; 1184 umenus = compat_ptr(p); 1185 1186 if (copy_in_user(umenus, kmenus, kp->menu_count * sizeof(*umenus))) 1187 return -EFAULT; 1188 1189 return 0; 1190 } 1191 1192 struct uvc_xu_control_query32 { 1193 __u8 unit; 1194 __u8 selector; 1195 __u8 query; 1196 __u16 size; 1197 compat_caddr_t data; 1198 }; 1199 1200 static int uvc_v4l2_get_xu_query(struct uvc_xu_control_query *kp, 1201 const struct uvc_xu_control_query32 __user *up) 1202 { 1203 u8 __user *udata; 1204 u8 __user *kdata; 1205 compat_caddr_t p; 1206 1207 if (!access_ok(VERIFY_READ, up, sizeof(*up)) || 1208 __copy_from_user(kp, up, offsetof(typeof(*up), data))) 1209 return -EFAULT; 1210 1211 if (kp->size == 0) { 1212 kp->data = NULL; 1213 return 0; 1214 } 1215 1216 if (__get_user(p, &up->data)) 1217 return -EFAULT; 1218 udata = compat_ptr(p); 1219 if (!access_ok(VERIFY_READ, udata, kp->size)) 1220 return -EFAULT; 1221 1222 kdata = compat_alloc_user_space(kp->size); 1223 if (kdata == NULL) 1224 return -EFAULT; 1225 kp->data = kdata; 1226 1227 if (copy_in_user(kdata, udata, kp->size)) 1228 return -EFAULT; 1229 1230 return 0; 1231 } 1232 1233 static int uvc_v4l2_put_xu_query(const struct uvc_xu_control_query *kp, 1234 struct uvc_xu_control_query32 __user *up) 1235 { 1236 u8 __user *udata; 1237 u8 __user *kdata = kp->data; 1238 compat_caddr_t p; 1239 1240 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) || 1241 __copy_to_user(up, kp, offsetof(typeof(*up), data))) 1242 return -EFAULT; 1243 1244 if (kp->size == 0) 1245 return 0; 1246 1247 if (get_user(p, &up->data)) 1248 return -EFAULT; 1249 udata = compat_ptr(p); 1250 if (!access_ok(VERIFY_READ, udata, kp->size)) 1251 return -EFAULT; 1252 1253 if (copy_in_user(udata, kdata, kp->size)) 1254 return -EFAULT; 1255 1256 return 0; 1257 } 1258 1259 #define UVCIOC_CTRL_MAP32 _IOWR('u', 0x20, struct uvc_xu_control_mapping32) 1260 #define UVCIOC_CTRL_QUERY32 _IOWR('u', 0x21, struct uvc_xu_control_query32) 1261 1262 static long uvc_v4l2_compat_ioctl32(struct file *file, 1263 unsigned int cmd, unsigned long arg) 1264 { 1265 union { 1266 struct uvc_xu_control_mapping xmap; 1267 struct uvc_xu_control_query xqry; 1268 } karg; 1269 void __user *up = compat_ptr(arg); 1270 mm_segment_t old_fs; 1271 long ret; 1272 1273 switch (cmd) { 1274 case UVCIOC_CTRL_MAP32: 1275 cmd = UVCIOC_CTRL_MAP; 1276 ret = uvc_v4l2_get_xu_mapping(&karg.xmap, up); 1277 break; 1278 1279 case UVCIOC_CTRL_QUERY32: 1280 cmd = UVCIOC_CTRL_QUERY; 1281 ret = uvc_v4l2_get_xu_query(&karg.xqry, up); 1282 break; 1283 1284 default: 1285 return -ENOIOCTLCMD; 1286 } 1287 1288 old_fs = get_fs(); 1289 set_fs(KERNEL_DS); 1290 ret = uvc_v4l2_ioctl(file, cmd, (unsigned long)&karg); 1291 set_fs(old_fs); 1292 1293 if (ret < 0) 1294 return ret; 1295 1296 switch (cmd) { 1297 case UVCIOC_CTRL_MAP: 1298 ret = uvc_v4l2_put_xu_mapping(&karg.xmap, up); 1299 break; 1300 1301 case UVCIOC_CTRL_QUERY: 1302 ret = uvc_v4l2_put_xu_query(&karg.xqry, up); 1303 break; 1304 } 1305 1306 return ret; 1307 } 1308 #endif 1309 1310 static ssize_t uvc_v4l2_read(struct file *file, char __user *data, 1311 size_t count, loff_t *ppos) 1312 { 1313 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n"); 1314 return -EINVAL; 1315 } 1316 1317 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma) 1318 { 1319 struct uvc_fh *handle = file->private_data; 1320 struct uvc_streaming *stream = handle->stream; 1321 1322 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n"); 1323 1324 return uvc_queue_mmap(&stream->queue, vma); 1325 } 1326 1327 static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait) 1328 { 1329 struct uvc_fh *handle = file->private_data; 1330 struct uvc_streaming *stream = handle->stream; 1331 1332 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n"); 1333 1334 return uvc_queue_poll(&stream->queue, file, wait); 1335 } 1336 1337 #ifndef CONFIG_MMU 1338 static unsigned long uvc_v4l2_get_unmapped_area(struct file *file, 1339 unsigned long addr, unsigned long len, unsigned long pgoff, 1340 unsigned long flags) 1341 { 1342 struct uvc_fh *handle = file->private_data; 1343 struct uvc_streaming *stream = handle->stream; 1344 1345 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_get_unmapped_area\n"); 1346 1347 return uvc_queue_get_unmapped_area(&stream->queue, pgoff); 1348 } 1349 #endif 1350 1351 const struct v4l2_file_operations uvc_fops = { 1352 .owner = THIS_MODULE, 1353 .open = uvc_v4l2_open, 1354 .release = uvc_v4l2_release, 1355 .unlocked_ioctl = uvc_v4l2_ioctl, 1356 #ifdef CONFIG_COMPAT 1357 .compat_ioctl32 = uvc_v4l2_compat_ioctl32, 1358 #endif 1359 .read = uvc_v4l2_read, 1360 .mmap = uvc_v4l2_mmap, 1361 .poll = uvc_v4l2_poll, 1362 #ifndef CONFIG_MMU 1363 .get_unmapped_area = uvc_v4l2_get_unmapped_area, 1364 #endif 1365 }; 1366 1367