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 mutex_lock(&stream->dev->lock); 502 if (stream->dev->users == 0) { 503 ret = uvc_status_start(stream->dev, GFP_KERNEL); 504 if (ret < 0) { 505 mutex_unlock(&stream->dev->lock); 506 usb_autopm_put_interface(stream->dev->intf); 507 kfree(handle); 508 return ret; 509 } 510 } 511 512 stream->dev->users++; 513 mutex_unlock(&stream->dev->lock); 514 515 v4l2_fh_init(&handle->vfh, stream->vdev); 516 v4l2_fh_add(&handle->vfh); 517 handle->chain = stream->chain; 518 handle->stream = stream; 519 handle->state = UVC_HANDLE_PASSIVE; 520 file->private_data = handle; 521 522 return 0; 523 } 524 525 static int uvc_v4l2_release(struct file *file) 526 { 527 struct uvc_fh *handle = file->private_data; 528 struct uvc_streaming *stream = handle->stream; 529 530 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n"); 531 532 /* Only free resources if this is a privileged handle. */ 533 if (uvc_has_privileges(handle)) { 534 uvc_video_enable(stream, 0); 535 uvc_free_buffers(&stream->queue); 536 } 537 538 /* Release the file handle. */ 539 uvc_dismiss_privileges(handle); 540 v4l2_fh_del(&handle->vfh); 541 v4l2_fh_exit(&handle->vfh); 542 kfree(handle); 543 file->private_data = NULL; 544 545 mutex_lock(&stream->dev->lock); 546 if (--stream->dev->users == 0) 547 uvc_status_stop(stream->dev); 548 mutex_unlock(&stream->dev->lock); 549 550 usb_autopm_put_interface(stream->dev->intf); 551 return 0; 552 } 553 554 static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg) 555 { 556 struct video_device *vdev = video_devdata(file); 557 struct uvc_fh *handle = file->private_data; 558 struct uvc_video_chain *chain = handle->chain; 559 struct uvc_streaming *stream = handle->stream; 560 long ret = 0; 561 562 switch (cmd) { 563 /* Query capabilities */ 564 case VIDIOC_QUERYCAP: 565 { 566 struct v4l2_capability *cap = arg; 567 568 memset(cap, 0, sizeof *cap); 569 strlcpy(cap->driver, "uvcvideo", sizeof cap->driver); 570 strlcpy(cap->card, vdev->name, sizeof cap->card); 571 usb_make_path(stream->dev->udev, 572 cap->bus_info, sizeof(cap->bus_info)); 573 cap->version = LINUX_VERSION_CODE; 574 cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING 575 | chain->caps; 576 if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) 577 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE 578 | V4L2_CAP_STREAMING; 579 else 580 cap->device_caps = V4L2_CAP_VIDEO_OUTPUT 581 | V4L2_CAP_STREAMING; 582 break; 583 } 584 585 /* Priority */ 586 case VIDIOC_G_PRIORITY: 587 *(u32 *)arg = v4l2_prio_max(vdev->prio); 588 break; 589 590 case VIDIOC_S_PRIORITY: 591 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio); 592 if (ret < 0) 593 return ret; 594 595 return v4l2_prio_change(vdev->prio, &handle->vfh.prio, 596 *(u32 *)arg); 597 598 /* Get, Set & Query control */ 599 case VIDIOC_QUERYCTRL: 600 return uvc_query_v4l2_ctrl(chain, arg); 601 602 case VIDIOC_G_CTRL: 603 { 604 struct v4l2_control *ctrl = arg; 605 struct v4l2_ext_control xctrl; 606 607 memset(&xctrl, 0, sizeof xctrl); 608 xctrl.id = ctrl->id; 609 610 ret = uvc_ctrl_begin(chain); 611 if (ret < 0) 612 return ret; 613 614 ret = uvc_ctrl_get(chain, &xctrl); 615 uvc_ctrl_rollback(handle); 616 if (ret >= 0) 617 ctrl->value = xctrl.value; 618 break; 619 } 620 621 case VIDIOC_S_CTRL: 622 { 623 struct v4l2_control *ctrl = arg; 624 struct v4l2_ext_control xctrl; 625 626 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio); 627 if (ret < 0) 628 return ret; 629 630 memset(&xctrl, 0, sizeof xctrl); 631 xctrl.id = ctrl->id; 632 xctrl.value = ctrl->value; 633 634 ret = uvc_ctrl_begin(chain); 635 if (ret < 0) 636 return ret; 637 638 ret = uvc_ctrl_set(chain, &xctrl); 639 if (ret < 0) { 640 uvc_ctrl_rollback(handle); 641 return ret; 642 } 643 ret = uvc_ctrl_commit(handle, &xctrl, 1); 644 if (ret == 0) 645 ctrl->value = xctrl.value; 646 break; 647 } 648 649 case VIDIOC_QUERYMENU: 650 return uvc_query_v4l2_menu(chain, arg); 651 652 case VIDIOC_G_EXT_CTRLS: 653 { 654 struct v4l2_ext_controls *ctrls = arg; 655 struct v4l2_ext_control *ctrl = ctrls->controls; 656 unsigned int i; 657 658 ret = uvc_ctrl_begin(chain); 659 if (ret < 0) 660 return ret; 661 662 for (i = 0; i < ctrls->count; ++ctrl, ++i) { 663 ret = uvc_ctrl_get(chain, ctrl); 664 if (ret < 0) { 665 uvc_ctrl_rollback(handle); 666 ctrls->error_idx = i; 667 return ret; 668 } 669 } 670 ctrls->error_idx = 0; 671 ret = uvc_ctrl_rollback(handle); 672 break; 673 } 674 675 case VIDIOC_S_EXT_CTRLS: 676 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio); 677 if (ret < 0) 678 return ret; 679 /* Fall through */ 680 case VIDIOC_TRY_EXT_CTRLS: 681 { 682 struct v4l2_ext_controls *ctrls = arg; 683 struct v4l2_ext_control *ctrl = ctrls->controls; 684 unsigned int i; 685 686 ret = uvc_ctrl_begin(chain); 687 if (ret < 0) 688 return ret; 689 690 for (i = 0; i < ctrls->count; ++ctrl, ++i) { 691 ret = uvc_ctrl_set(chain, ctrl); 692 if (ret < 0) { 693 uvc_ctrl_rollback(handle); 694 ctrls->error_idx = cmd == VIDIOC_S_EXT_CTRLS 695 ? ctrls->count : i; 696 return ret; 697 } 698 } 699 700 ctrls->error_idx = 0; 701 702 if (cmd == VIDIOC_S_EXT_CTRLS) 703 ret = uvc_ctrl_commit(handle, 704 ctrls->controls, ctrls->count); 705 else 706 ret = uvc_ctrl_rollback(handle); 707 break; 708 } 709 710 /* Get, Set & Enum input */ 711 case VIDIOC_ENUMINPUT: 712 { 713 const struct uvc_entity *selector = chain->selector; 714 struct v4l2_input *input = arg; 715 struct uvc_entity *iterm = NULL; 716 u32 index = input->index; 717 int pin = 0; 718 719 if (selector == NULL || 720 (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) { 721 if (index != 0) 722 return -EINVAL; 723 list_for_each_entry(iterm, &chain->entities, chain) { 724 if (UVC_ENTITY_IS_ITERM(iterm)) 725 break; 726 } 727 pin = iterm->id; 728 } else if (index < selector->bNrInPins) { 729 pin = selector->baSourceID[index]; 730 list_for_each_entry(iterm, &chain->entities, chain) { 731 if (!UVC_ENTITY_IS_ITERM(iterm)) 732 continue; 733 if (iterm->id == pin) 734 break; 735 } 736 } 737 738 if (iterm == NULL || iterm->id != pin) 739 return -EINVAL; 740 741 memset(input, 0, sizeof *input); 742 input->index = index; 743 strlcpy(input->name, iterm->name, sizeof input->name); 744 if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA) 745 input->type = V4L2_INPUT_TYPE_CAMERA; 746 break; 747 } 748 749 case VIDIOC_G_INPUT: 750 { 751 u8 input; 752 753 if (chain->selector == NULL || 754 (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) { 755 *(int *)arg = 0; 756 break; 757 } 758 759 ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR, 760 chain->selector->id, chain->dev->intfnum, 761 UVC_SU_INPUT_SELECT_CONTROL, &input, 1); 762 if (ret < 0) 763 return ret; 764 765 *(int *)arg = input - 1; 766 break; 767 } 768 769 case VIDIOC_S_INPUT: 770 { 771 u32 input = *(u32 *)arg + 1; 772 773 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio); 774 if (ret < 0) 775 return ret; 776 777 if ((ret = uvc_acquire_privileges(handle)) < 0) 778 return ret; 779 780 if (chain->selector == NULL || 781 (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) { 782 if (input != 1) 783 return -EINVAL; 784 break; 785 } 786 787 if (input == 0 || input > chain->selector->bNrInPins) 788 return -EINVAL; 789 790 return uvc_query_ctrl(chain->dev, UVC_SET_CUR, 791 chain->selector->id, chain->dev->intfnum, 792 UVC_SU_INPUT_SELECT_CONTROL, &input, 1); 793 } 794 795 /* Try, Get, Set & Enum format */ 796 case VIDIOC_ENUM_FMT: 797 { 798 struct v4l2_fmtdesc *fmt = arg; 799 struct uvc_format *format; 800 enum v4l2_buf_type type = fmt->type; 801 __u32 index = fmt->index; 802 803 if (fmt->type != stream->type || 804 fmt->index >= stream->nformats) 805 return -EINVAL; 806 807 memset(fmt, 0, sizeof(*fmt)); 808 fmt->index = index; 809 fmt->type = type; 810 811 format = &stream->format[fmt->index]; 812 fmt->flags = 0; 813 if (format->flags & UVC_FMT_FLAG_COMPRESSED) 814 fmt->flags |= V4L2_FMT_FLAG_COMPRESSED; 815 strlcpy(fmt->description, format->name, 816 sizeof fmt->description); 817 fmt->description[sizeof fmt->description - 1] = 0; 818 fmt->pixelformat = format->fcc; 819 break; 820 } 821 822 case VIDIOC_TRY_FMT: 823 { 824 struct uvc_streaming_control probe; 825 826 return uvc_v4l2_try_format(stream, arg, &probe, NULL, NULL); 827 } 828 829 case VIDIOC_S_FMT: 830 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio); 831 if (ret < 0) 832 return ret; 833 834 if ((ret = uvc_acquire_privileges(handle)) < 0) 835 return ret; 836 837 return uvc_v4l2_set_format(stream, arg); 838 839 case VIDIOC_G_FMT: 840 return uvc_v4l2_get_format(stream, arg); 841 842 /* Frame size enumeration */ 843 case VIDIOC_ENUM_FRAMESIZES: 844 { 845 struct v4l2_frmsizeenum *fsize = arg; 846 struct uvc_format *format = NULL; 847 struct uvc_frame *frame; 848 int i; 849 850 /* Look for the given pixel format */ 851 for (i = 0; i < stream->nformats; i++) { 852 if (stream->format[i].fcc == 853 fsize->pixel_format) { 854 format = &stream->format[i]; 855 break; 856 } 857 } 858 if (format == NULL) 859 return -EINVAL; 860 861 if (fsize->index >= format->nframes) 862 return -EINVAL; 863 864 frame = &format->frame[fsize->index]; 865 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE; 866 fsize->discrete.width = frame->wWidth; 867 fsize->discrete.height = frame->wHeight; 868 break; 869 } 870 871 /* Frame interval enumeration */ 872 case VIDIOC_ENUM_FRAMEINTERVALS: 873 { 874 struct v4l2_frmivalenum *fival = arg; 875 struct uvc_format *format = NULL; 876 struct uvc_frame *frame = NULL; 877 int i; 878 879 /* Look for the given pixel format and frame size */ 880 for (i = 0; i < stream->nformats; i++) { 881 if (stream->format[i].fcc == 882 fival->pixel_format) { 883 format = &stream->format[i]; 884 break; 885 } 886 } 887 if (format == NULL) 888 return -EINVAL; 889 890 for (i = 0; i < format->nframes; i++) { 891 if (format->frame[i].wWidth == fival->width && 892 format->frame[i].wHeight == fival->height) { 893 frame = &format->frame[i]; 894 break; 895 } 896 } 897 if (frame == NULL) 898 return -EINVAL; 899 900 if (frame->bFrameIntervalType) { 901 if (fival->index >= frame->bFrameIntervalType) 902 return -EINVAL; 903 904 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE; 905 fival->discrete.numerator = 906 frame->dwFrameInterval[fival->index]; 907 fival->discrete.denominator = 10000000; 908 uvc_simplify_fraction(&fival->discrete.numerator, 909 &fival->discrete.denominator, 8, 333); 910 } else { 911 fival->type = V4L2_FRMIVAL_TYPE_STEPWISE; 912 fival->stepwise.min.numerator = 913 frame->dwFrameInterval[0]; 914 fival->stepwise.min.denominator = 10000000; 915 fival->stepwise.max.numerator = 916 frame->dwFrameInterval[1]; 917 fival->stepwise.max.denominator = 10000000; 918 fival->stepwise.step.numerator = 919 frame->dwFrameInterval[2]; 920 fival->stepwise.step.denominator = 10000000; 921 uvc_simplify_fraction(&fival->stepwise.min.numerator, 922 &fival->stepwise.min.denominator, 8, 333); 923 uvc_simplify_fraction(&fival->stepwise.max.numerator, 924 &fival->stepwise.max.denominator, 8, 333); 925 uvc_simplify_fraction(&fival->stepwise.step.numerator, 926 &fival->stepwise.step.denominator, 8, 333); 927 } 928 break; 929 } 930 931 /* Get & Set streaming parameters */ 932 case VIDIOC_G_PARM: 933 return uvc_v4l2_get_streamparm(stream, arg); 934 935 case VIDIOC_S_PARM: 936 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio); 937 if (ret < 0) 938 return ret; 939 940 if ((ret = uvc_acquire_privileges(handle)) < 0) 941 return ret; 942 943 return uvc_v4l2_set_streamparm(stream, arg); 944 945 /* Cropping and scaling */ 946 case VIDIOC_CROPCAP: 947 { 948 struct v4l2_cropcap *ccap = arg; 949 950 if (ccap->type != stream->type) 951 return -EINVAL; 952 953 ccap->bounds.left = 0; 954 ccap->bounds.top = 0; 955 956 mutex_lock(&stream->mutex); 957 ccap->bounds.width = stream->cur_frame->wWidth; 958 ccap->bounds.height = stream->cur_frame->wHeight; 959 mutex_unlock(&stream->mutex); 960 961 ccap->defrect = ccap->bounds; 962 963 ccap->pixelaspect.numerator = 1; 964 ccap->pixelaspect.denominator = 1; 965 break; 966 } 967 968 case VIDIOC_G_CROP: 969 case VIDIOC_S_CROP: 970 return -ENOTTY; 971 972 /* Buffers & streaming */ 973 case VIDIOC_REQBUFS: 974 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio); 975 if (ret < 0) 976 return ret; 977 978 if ((ret = uvc_acquire_privileges(handle)) < 0) 979 return ret; 980 981 mutex_lock(&stream->mutex); 982 ret = uvc_alloc_buffers(&stream->queue, arg); 983 mutex_unlock(&stream->mutex); 984 if (ret < 0) 985 return ret; 986 987 if (ret == 0) 988 uvc_dismiss_privileges(handle); 989 990 ret = 0; 991 break; 992 993 case VIDIOC_QUERYBUF: 994 { 995 struct v4l2_buffer *buf = arg; 996 997 if (!uvc_has_privileges(handle)) 998 return -EBUSY; 999 1000 return uvc_query_buffer(&stream->queue, buf); 1001 } 1002 1003 case VIDIOC_QBUF: 1004 if (!uvc_has_privileges(handle)) 1005 return -EBUSY; 1006 1007 return uvc_queue_buffer(&stream->queue, arg); 1008 1009 case VIDIOC_DQBUF: 1010 if (!uvc_has_privileges(handle)) 1011 return -EBUSY; 1012 1013 return uvc_dequeue_buffer(&stream->queue, arg, 1014 file->f_flags & O_NONBLOCK); 1015 1016 case VIDIOC_STREAMON: 1017 { 1018 int *type = arg; 1019 1020 if (*type != stream->type) 1021 return -EINVAL; 1022 1023 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio); 1024 if (ret < 0) 1025 return ret; 1026 1027 if (!uvc_has_privileges(handle)) 1028 return -EBUSY; 1029 1030 mutex_lock(&stream->mutex); 1031 ret = uvc_video_enable(stream, 1); 1032 mutex_unlock(&stream->mutex); 1033 if (ret < 0) 1034 return ret; 1035 break; 1036 } 1037 1038 case VIDIOC_STREAMOFF: 1039 { 1040 int *type = arg; 1041 1042 if (*type != stream->type) 1043 return -EINVAL; 1044 1045 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio); 1046 if (ret < 0) 1047 return ret; 1048 1049 if (!uvc_has_privileges(handle)) 1050 return -EBUSY; 1051 1052 return uvc_video_enable(stream, 0); 1053 } 1054 1055 case VIDIOC_SUBSCRIBE_EVENT: 1056 { 1057 struct v4l2_event_subscription *sub = arg; 1058 1059 switch (sub->type) { 1060 case V4L2_EVENT_CTRL: 1061 return v4l2_event_subscribe(&handle->vfh, sub, 0, 1062 &uvc_ctrl_sub_ev_ops); 1063 default: 1064 return -EINVAL; 1065 } 1066 } 1067 1068 case VIDIOC_UNSUBSCRIBE_EVENT: 1069 return v4l2_event_unsubscribe(&handle->vfh, arg); 1070 1071 case VIDIOC_DQEVENT: 1072 return v4l2_event_dequeue(&handle->vfh, arg, 1073 file->f_flags & O_NONBLOCK); 1074 1075 /* Analog video standards make no sense for digital cameras. */ 1076 case VIDIOC_ENUMSTD: 1077 case VIDIOC_QUERYSTD: 1078 case VIDIOC_G_STD: 1079 case VIDIOC_S_STD: 1080 1081 case VIDIOC_OVERLAY: 1082 1083 case VIDIOC_ENUMAUDIO: 1084 case VIDIOC_ENUMAUDOUT: 1085 1086 case VIDIOC_ENUMOUTPUT: 1087 uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd); 1088 return -ENOTTY; 1089 1090 case UVCIOC_CTRL_MAP: 1091 return uvc_ioctl_ctrl_map(chain, arg); 1092 1093 case UVCIOC_CTRL_QUERY: 1094 return uvc_xu_ctrl_query(chain, arg); 1095 1096 default: 1097 uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n", cmd); 1098 return -ENOTTY; 1099 } 1100 1101 return ret; 1102 } 1103 1104 static long uvc_v4l2_ioctl(struct file *file, 1105 unsigned int cmd, unsigned long arg) 1106 { 1107 if (uvc_trace_param & UVC_TRACE_IOCTL) { 1108 uvc_printk(KERN_DEBUG, "uvc_v4l2_ioctl("); 1109 v4l_printk_ioctl(NULL, cmd); 1110 printk(")\n"); 1111 } 1112 1113 return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl); 1114 } 1115 1116 #ifdef CONFIG_COMPAT 1117 struct uvc_xu_control_mapping32 { 1118 __u32 id; 1119 __u8 name[32]; 1120 __u8 entity[16]; 1121 __u8 selector; 1122 1123 __u8 size; 1124 __u8 offset; 1125 __u32 v4l2_type; 1126 __u32 data_type; 1127 1128 compat_caddr_t menu_info; 1129 __u32 menu_count; 1130 1131 __u32 reserved[4]; 1132 }; 1133 1134 static int uvc_v4l2_get_xu_mapping(struct uvc_xu_control_mapping *kp, 1135 const struct uvc_xu_control_mapping32 __user *up) 1136 { 1137 struct uvc_menu_info __user *umenus; 1138 struct uvc_menu_info __user *kmenus; 1139 compat_caddr_t p; 1140 1141 if (!access_ok(VERIFY_READ, up, sizeof(*up)) || 1142 __copy_from_user(kp, up, offsetof(typeof(*up), menu_info)) || 1143 __get_user(kp->menu_count, &up->menu_count)) 1144 return -EFAULT; 1145 1146 memset(kp->reserved, 0, sizeof(kp->reserved)); 1147 1148 if (kp->menu_count == 0) { 1149 kp->menu_info = NULL; 1150 return 0; 1151 } 1152 1153 if (__get_user(p, &up->menu_info)) 1154 return -EFAULT; 1155 umenus = compat_ptr(p); 1156 if (!access_ok(VERIFY_READ, umenus, kp->menu_count * sizeof(*umenus))) 1157 return -EFAULT; 1158 1159 kmenus = compat_alloc_user_space(kp->menu_count * sizeof(*kmenus)); 1160 if (kmenus == NULL) 1161 return -EFAULT; 1162 kp->menu_info = kmenus; 1163 1164 if (copy_in_user(kmenus, umenus, kp->menu_count * sizeof(*umenus))) 1165 return -EFAULT; 1166 1167 return 0; 1168 } 1169 1170 static int uvc_v4l2_put_xu_mapping(const struct uvc_xu_control_mapping *kp, 1171 struct uvc_xu_control_mapping32 __user *up) 1172 { 1173 struct uvc_menu_info __user *umenus; 1174 struct uvc_menu_info __user *kmenus = kp->menu_info; 1175 compat_caddr_t p; 1176 1177 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) || 1178 __copy_to_user(up, kp, offsetof(typeof(*up), menu_info)) || 1179 __put_user(kp->menu_count, &up->menu_count)) 1180 return -EFAULT; 1181 1182 if (__clear_user(up->reserved, sizeof(up->reserved))) 1183 return -EFAULT; 1184 1185 if (kp->menu_count == 0) 1186 return 0; 1187 1188 if (get_user(p, &up->menu_info)) 1189 return -EFAULT; 1190 umenus = compat_ptr(p); 1191 1192 if (copy_in_user(umenus, kmenus, kp->menu_count * sizeof(*umenus))) 1193 return -EFAULT; 1194 1195 return 0; 1196 } 1197 1198 struct uvc_xu_control_query32 { 1199 __u8 unit; 1200 __u8 selector; 1201 __u8 query; 1202 __u16 size; 1203 compat_caddr_t data; 1204 }; 1205 1206 static int uvc_v4l2_get_xu_query(struct uvc_xu_control_query *kp, 1207 const struct uvc_xu_control_query32 __user *up) 1208 { 1209 u8 __user *udata; 1210 u8 __user *kdata; 1211 compat_caddr_t p; 1212 1213 if (!access_ok(VERIFY_READ, up, sizeof(*up)) || 1214 __copy_from_user(kp, up, offsetof(typeof(*up), data))) 1215 return -EFAULT; 1216 1217 if (kp->size == 0) { 1218 kp->data = NULL; 1219 return 0; 1220 } 1221 1222 if (__get_user(p, &up->data)) 1223 return -EFAULT; 1224 udata = compat_ptr(p); 1225 if (!access_ok(VERIFY_READ, udata, kp->size)) 1226 return -EFAULT; 1227 1228 kdata = compat_alloc_user_space(kp->size); 1229 if (kdata == NULL) 1230 return -EFAULT; 1231 kp->data = kdata; 1232 1233 if (copy_in_user(kdata, udata, kp->size)) 1234 return -EFAULT; 1235 1236 return 0; 1237 } 1238 1239 static int uvc_v4l2_put_xu_query(const struct uvc_xu_control_query *kp, 1240 struct uvc_xu_control_query32 __user *up) 1241 { 1242 u8 __user *udata; 1243 u8 __user *kdata = kp->data; 1244 compat_caddr_t p; 1245 1246 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) || 1247 __copy_to_user(up, kp, offsetof(typeof(*up), data))) 1248 return -EFAULT; 1249 1250 if (kp->size == 0) 1251 return 0; 1252 1253 if (get_user(p, &up->data)) 1254 return -EFAULT; 1255 udata = compat_ptr(p); 1256 if (!access_ok(VERIFY_READ, udata, kp->size)) 1257 return -EFAULT; 1258 1259 if (copy_in_user(udata, kdata, kp->size)) 1260 return -EFAULT; 1261 1262 return 0; 1263 } 1264 1265 #define UVCIOC_CTRL_MAP32 _IOWR('u', 0x20, struct uvc_xu_control_mapping32) 1266 #define UVCIOC_CTRL_QUERY32 _IOWR('u', 0x21, struct uvc_xu_control_query32) 1267 1268 static long uvc_v4l2_compat_ioctl32(struct file *file, 1269 unsigned int cmd, unsigned long arg) 1270 { 1271 union { 1272 struct uvc_xu_control_mapping xmap; 1273 struct uvc_xu_control_query xqry; 1274 } karg; 1275 void __user *up = compat_ptr(arg); 1276 mm_segment_t old_fs; 1277 long ret; 1278 1279 switch (cmd) { 1280 case UVCIOC_CTRL_MAP32: 1281 cmd = UVCIOC_CTRL_MAP; 1282 ret = uvc_v4l2_get_xu_mapping(&karg.xmap, up); 1283 break; 1284 1285 case UVCIOC_CTRL_QUERY32: 1286 cmd = UVCIOC_CTRL_QUERY; 1287 ret = uvc_v4l2_get_xu_query(&karg.xqry, up); 1288 break; 1289 1290 default: 1291 return -ENOIOCTLCMD; 1292 } 1293 1294 old_fs = get_fs(); 1295 set_fs(KERNEL_DS); 1296 ret = uvc_v4l2_ioctl(file, cmd, (unsigned long)&karg); 1297 set_fs(old_fs); 1298 1299 if (ret < 0) 1300 return ret; 1301 1302 switch (cmd) { 1303 case UVCIOC_CTRL_MAP: 1304 ret = uvc_v4l2_put_xu_mapping(&karg.xmap, up); 1305 break; 1306 1307 case UVCIOC_CTRL_QUERY: 1308 ret = uvc_v4l2_put_xu_query(&karg.xqry, up); 1309 break; 1310 } 1311 1312 return ret; 1313 } 1314 #endif 1315 1316 static ssize_t uvc_v4l2_read(struct file *file, char __user *data, 1317 size_t count, loff_t *ppos) 1318 { 1319 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n"); 1320 return -EINVAL; 1321 } 1322 1323 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma) 1324 { 1325 struct uvc_fh *handle = file->private_data; 1326 struct uvc_streaming *stream = handle->stream; 1327 1328 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n"); 1329 1330 return uvc_queue_mmap(&stream->queue, vma); 1331 } 1332 1333 static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait) 1334 { 1335 struct uvc_fh *handle = file->private_data; 1336 struct uvc_streaming *stream = handle->stream; 1337 1338 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n"); 1339 1340 return uvc_queue_poll(&stream->queue, file, wait); 1341 } 1342 1343 #ifndef CONFIG_MMU 1344 static unsigned long uvc_v4l2_get_unmapped_area(struct file *file, 1345 unsigned long addr, unsigned long len, unsigned long pgoff, 1346 unsigned long flags) 1347 { 1348 struct uvc_fh *handle = file->private_data; 1349 struct uvc_streaming *stream = handle->stream; 1350 1351 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_get_unmapped_area\n"); 1352 1353 return uvc_queue_get_unmapped_area(&stream->queue, pgoff); 1354 } 1355 #endif 1356 1357 const struct v4l2_file_operations uvc_fops = { 1358 .owner = THIS_MODULE, 1359 .open = uvc_v4l2_open, 1360 .release = uvc_v4l2_release, 1361 .unlocked_ioctl = uvc_v4l2_ioctl, 1362 #ifdef CONFIG_COMPAT 1363 .compat_ioctl32 = uvc_v4l2_compat_ioctl32, 1364 #endif 1365 .read = uvc_v4l2_read, 1366 .mmap = uvc_v4l2_mmap, 1367 .poll = uvc_v4l2_poll, 1368 #ifndef CONFIG_MMU 1369 .get_unmapped_area = uvc_v4l2_get_unmapped_area, 1370 #endif 1371 }; 1372 1373