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