/* * uvc_v4l2.c -- USB Video Class driver - V4L2 API * * Copyright (C) 2005-2009 * Laurent Pinchart (laurent.pinchart@skynet.be) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * */ #include #include #include #include #include #include #include #include #include #include #include #include #include "uvcvideo.h" /* ------------------------------------------------------------------------ * V4L2 interface */ /* * Mapping V4L2 controls to UVC controls can be straighforward if done well. * Most of the UVC controls exist in V4L2, and can be mapped directly. Some * must be grouped (for instance the Red Balance, Blue Balance and Do White * Balance V4L2 controls use the White Balance Component UVC control) or * otherwise translated. The approach we take here is to use a translation * table for the controls that can be mapped directly, and handle the others * manually. */ static int uvc_v4l2_query_menu(struct uvc_video_device *video, struct v4l2_querymenu *query_menu) { struct uvc_menu_info *menu_info; struct uvc_control_mapping *mapping; struct uvc_control *ctrl; u32 index = query_menu->index; u32 id = query_menu->id; ctrl = uvc_find_control(video, query_menu->id, &mapping); if (ctrl == NULL || mapping->v4l2_type != V4L2_CTRL_TYPE_MENU) return -EINVAL; if (query_menu->index >= mapping->menu_count) return -EINVAL; memset(query_menu, 0, sizeof(*query_menu)); query_menu->id = id; query_menu->index = index; menu_info = &mapping->menu_info[query_menu->index]; strlcpy(query_menu->name, menu_info->name, sizeof query_menu->name); return 0; } /* * Find the frame interval closest to the requested frame interval for the * given frame format and size. This should be done by the device as part of * the Video Probe and Commit negotiation, but some hardware don't implement * that feature. */ static __u32 uvc_try_frame_interval(struct uvc_frame *frame, __u32 interval) { unsigned int i; if (frame->bFrameIntervalType) { __u32 best = -1, dist; for (i = 0; i < frame->bFrameIntervalType; ++i) { dist = interval > frame->dwFrameInterval[i] ? interval - frame->dwFrameInterval[i] : frame->dwFrameInterval[i] - interval; if (dist > best) break; best = dist; } interval = frame->dwFrameInterval[i-1]; } else { const __u32 min = frame->dwFrameInterval[0]; const __u32 max = frame->dwFrameInterval[1]; const __u32 step = frame->dwFrameInterval[2]; interval = min + (interval - min + step/2) / step * step; if (interval > max) interval = max; } return interval; } static int uvc_v4l2_try_format(struct uvc_streaming *stream, struct v4l2_format *fmt, struct uvc_streaming_control *probe, struct uvc_format **uvc_format, struct uvc_frame **uvc_frame) { struct uvc_format *format = NULL; struct uvc_frame *frame = NULL; __u16 rw, rh; unsigned int d, maxd; unsigned int i; __u32 interval; int ret = 0; __u8 *fcc; if (fmt->type != stream->type) return -EINVAL; fcc = (__u8 *)&fmt->fmt.pix.pixelformat; uvc_trace(UVC_TRACE_FORMAT, "Trying format 0x%08x (%c%c%c%c): %ux%u.\n", fmt->fmt.pix.pixelformat, fcc[0], fcc[1], fcc[2], fcc[3], fmt->fmt.pix.width, fmt->fmt.pix.height); /* Check if the hardware supports the requested format. */ for (i = 0; i < stream->nformats; ++i) { format = &stream->format[i]; if (format->fcc == fmt->fmt.pix.pixelformat) break; } if (format == NULL || format->fcc != fmt->fmt.pix.pixelformat) { uvc_trace(UVC_TRACE_FORMAT, "Unsupported format 0x%08x.\n", fmt->fmt.pix.pixelformat); return -EINVAL; } /* Find the closest image size. The distance between image sizes is * the size in pixels of the non-overlapping regions between the * requested size and the frame-specified size. */ rw = fmt->fmt.pix.width; rh = fmt->fmt.pix.height; maxd = (unsigned int)-1; for (i = 0; i < format->nframes; ++i) { __u16 w = format->frame[i].wWidth; __u16 h = format->frame[i].wHeight; d = min(w, rw) * min(h, rh); d = w*h + rw*rh - 2*d; if (d < maxd) { maxd = d; frame = &format->frame[i]; } if (maxd == 0) break; } if (frame == NULL) { uvc_trace(UVC_TRACE_FORMAT, "Unsupported size %ux%u.\n", fmt->fmt.pix.width, fmt->fmt.pix.height); return -EINVAL; } /* Use the default frame interval. */ interval = frame->dwDefaultFrameInterval; uvc_trace(UVC_TRACE_FORMAT, "Using default frame interval %u.%u us " "(%u.%u fps).\n", interval/10, interval%10, 10000000/interval, (100000000/interval)%10); /* Set the format index, frame index and frame interval. */ memset(probe, 0, sizeof *probe); probe->bmHint = 1; /* dwFrameInterval */ probe->bFormatIndex = format->index; probe->bFrameIndex = frame->bFrameIndex; probe->dwFrameInterval = uvc_try_frame_interval(frame, interval); /* Some webcams stall the probe control set request when the * dwMaxVideoFrameSize field is set to zero. The UVC specification * clearly states that the field is read-only from the host, so this * is a webcam bug. Set dwMaxVideoFrameSize to the value reported by * the webcam to work around the problem. * * The workaround could probably be enabled for all webcams, so the * quirk can be removed if needed. It's currently useful to detect * webcam bugs and fix them before they hit the market (providing * developers test their webcams with the Linux driver as well as with * the Windows driver). */ if (stream->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS) probe->dwMaxVideoFrameSize = stream->ctrl.dwMaxVideoFrameSize; /* Probe the device. */ ret = uvc_probe_video(stream, probe); if (ret < 0) goto done; fmt->fmt.pix.width = frame->wWidth; fmt->fmt.pix.height = frame->wHeight; fmt->fmt.pix.field = V4L2_FIELD_NONE; fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8; fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize; fmt->fmt.pix.colorspace = format->colorspace; fmt->fmt.pix.priv = 0; if (uvc_format != NULL) *uvc_format = format; if (uvc_frame != NULL) *uvc_frame = frame; done: return ret; } static int uvc_v4l2_get_format(struct uvc_streaming *stream, struct v4l2_format *fmt) { struct uvc_format *format = stream->cur_format; struct uvc_frame *frame = stream->cur_frame; if (fmt->type != stream->type) return -EINVAL; if (format == NULL || frame == NULL) return -EINVAL; fmt->fmt.pix.pixelformat = format->fcc; fmt->fmt.pix.width = frame->wWidth; fmt->fmt.pix.height = frame->wHeight; fmt->fmt.pix.field = V4L2_FIELD_NONE; fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8; fmt->fmt.pix.sizeimage = stream->ctrl.dwMaxVideoFrameSize; fmt->fmt.pix.colorspace = format->colorspace; fmt->fmt.pix.priv = 0; return 0; } static int uvc_v4l2_set_format(struct uvc_streaming *stream, struct v4l2_format *fmt) { struct uvc_streaming_control probe; struct uvc_format *format; struct uvc_frame *frame; int ret; if (fmt->type != stream->type) return -EINVAL; if (uvc_queue_allocated(&stream->queue)) return -EBUSY; ret = uvc_v4l2_try_format(stream, fmt, &probe, &format, &frame); if (ret < 0) return ret; memcpy(&stream->ctrl, &probe, sizeof probe); stream->cur_format = format; stream->cur_frame = frame; return 0; } static int uvc_v4l2_get_streamparm(struct uvc_streaming *stream, struct v4l2_streamparm *parm) { uint32_t numerator, denominator; if (parm->type != stream->type) return -EINVAL; numerator = stream->ctrl.dwFrameInterval; denominator = 10000000; uvc_simplify_fraction(&numerator, &denominator, 8, 333); memset(parm, 0, sizeof *parm); parm->type = stream->type; if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) { parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME; parm->parm.capture.capturemode = 0; parm->parm.capture.timeperframe.numerator = numerator; parm->parm.capture.timeperframe.denominator = denominator; parm->parm.capture.extendedmode = 0; parm->parm.capture.readbuffers = 0; } else { parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME; parm->parm.output.outputmode = 0; parm->parm.output.timeperframe.numerator = numerator; parm->parm.output.timeperframe.denominator = denominator; } return 0; } static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream, struct v4l2_streamparm *parm) { struct uvc_frame *frame = stream->cur_frame; struct uvc_streaming_control probe; struct v4l2_fract timeperframe; uint32_t interval; int ret; if (parm->type != stream->type) return -EINVAL; if (uvc_queue_streaming(&stream->queue)) return -EBUSY; if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) timeperframe = parm->parm.capture.timeperframe; else timeperframe = parm->parm.output.timeperframe; memcpy(&probe, &stream->ctrl, sizeof probe); interval = uvc_fraction_to_interval(timeperframe.numerator, timeperframe.denominator); uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n", timeperframe.numerator, timeperframe.denominator, interval); probe.dwFrameInterval = uvc_try_frame_interval(frame, interval); /* Probe the device with the new settings. */ ret = uvc_probe_video(stream, &probe); if (ret < 0) return ret; memcpy(&stream->ctrl, &probe, sizeof probe); /* Return the actual frame period. */ timeperframe.numerator = probe.dwFrameInterval; timeperframe.denominator = 10000000; uvc_simplify_fraction(&timeperframe.numerator, &timeperframe.denominator, 8, 333); if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) parm->parm.capture.timeperframe = timeperframe; else parm->parm.output.timeperframe = timeperframe; return 0; } /* ------------------------------------------------------------------------ * Privilege management */ /* * Privilege management is the multiple-open implementation basis. The current * implementation is completely transparent for the end-user and doesn't * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls. * Those ioctls enable finer control on the device (by making possible for a * user to request exclusive access to a device), but are not mature yet. * Switching to the V4L2 priority mechanism might be considered in the future * if this situation changes. * * Each open instance of a UVC device can either be in a privileged or * unprivileged state. Only a single instance can be in a privileged state at * a given time. Trying to perform an operation that requires privileges will * automatically acquire the required privileges if possible, or return -EBUSY * otherwise. Privileges are dismissed when closing the instance. * * Operations that require privileges are: * * - VIDIOC_S_INPUT * - VIDIOC_S_PARM * - VIDIOC_S_FMT * - VIDIOC_TRY_FMT * - VIDIOC_REQBUFS */ static int uvc_acquire_privileges(struct uvc_fh *handle) { int ret = 0; /* Always succeed if the handle is already privileged. */ if (handle->state == UVC_HANDLE_ACTIVE) return 0; /* Check if the device already has a privileged handle. */ mutex_lock(&uvc_driver.open_mutex); if (atomic_inc_return(&handle->stream->active) != 1) { atomic_dec(&handle->stream->active); ret = -EBUSY; goto done; } handle->state = UVC_HANDLE_ACTIVE; done: mutex_unlock(&uvc_driver.open_mutex); return ret; } static void uvc_dismiss_privileges(struct uvc_fh *handle) { if (handle->state == UVC_HANDLE_ACTIVE) atomic_dec(&handle->stream->active); handle->state = UVC_HANDLE_PASSIVE; } static int uvc_has_privileges(struct uvc_fh *handle) { return handle->state == UVC_HANDLE_ACTIVE; } /* ------------------------------------------------------------------------ * V4L2 file operations */ static int uvc_v4l2_open(struct file *file) { struct uvc_streaming *stream; struct uvc_fh *handle; int ret = 0; uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n"); mutex_lock(&uvc_driver.open_mutex); stream = video_drvdata(file); if (stream->dev->state & UVC_DEV_DISCONNECTED) { ret = -ENODEV; goto done; } ret = usb_autopm_get_interface(stream->dev->intf); if (ret < 0) goto done; /* Create the device handle. */ handle = kzalloc(sizeof *handle, GFP_KERNEL); if (handle == NULL) { usb_autopm_put_interface(stream->dev->intf); ret = -ENOMEM; goto done; } if (atomic_inc_return(&stream->dev->users) == 1) { ret = uvc_status_start(stream->dev); if (ret < 0) { usb_autopm_put_interface(stream->dev->intf); atomic_dec(&stream->dev->users); kfree(handle); goto done; } } handle->video = &stream->dev->video; handle->stream = stream; handle->state = UVC_HANDLE_PASSIVE; file->private_data = handle; kref_get(&stream->dev->kref); done: mutex_unlock(&uvc_driver.open_mutex); return ret; } static int uvc_v4l2_release(struct file *file) { struct uvc_fh *handle = (struct uvc_fh *)file->private_data; struct uvc_streaming *stream = handle->stream; uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n"); /* Only free resources if this is a privileged handle. */ if (uvc_has_privileges(handle)) { uvc_video_enable(stream, 0); mutex_lock(&stream->queue.mutex); if (uvc_free_buffers(&stream->queue) < 0) uvc_printk(KERN_ERR, "uvc_v4l2_release: Unable to " "free buffers.\n"); mutex_unlock(&stream->queue.mutex); } /* Release the file handle. */ uvc_dismiss_privileges(handle); kfree(handle); file->private_data = NULL; if (atomic_dec_return(&stream->dev->users) == 0) uvc_status_stop(stream->dev); usb_autopm_put_interface(stream->dev->intf); kref_put(&stream->dev->kref, uvc_delete); return 0; } static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg) { struct video_device *vdev = video_devdata(file); struct uvc_fh *handle = (struct uvc_fh *)file->private_data; struct uvc_video_device *video = handle->video; struct uvc_streaming *stream = handle->stream; long ret = 0; switch (cmd) { /* Query capabilities */ case VIDIOC_QUERYCAP: { struct v4l2_capability *cap = arg; memset(cap, 0, sizeof *cap); strlcpy(cap->driver, "uvcvideo", sizeof cap->driver); strlcpy(cap->card, vdev->name, sizeof cap->card); usb_make_path(stream->dev->udev, cap->bus_info, sizeof(cap->bus_info)); cap->version = DRIVER_VERSION_NUMBER; if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING; else cap->capabilities = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING; break; } /* Get, Set & Query control */ case VIDIOC_QUERYCTRL: return uvc_query_v4l2_ctrl(video, arg); case VIDIOC_G_CTRL: { struct v4l2_control *ctrl = arg; struct v4l2_ext_control xctrl; memset(&xctrl, 0, sizeof xctrl); xctrl.id = ctrl->id; ret = uvc_ctrl_begin(video); if (ret < 0) return ret; ret = uvc_ctrl_get(video, &xctrl); uvc_ctrl_rollback(video); if (ret >= 0) ctrl->value = xctrl.value; break; } case VIDIOC_S_CTRL: { struct v4l2_control *ctrl = arg; struct v4l2_ext_control xctrl; memset(&xctrl, 0, sizeof xctrl); xctrl.id = ctrl->id; xctrl.value = ctrl->value; ret = uvc_ctrl_begin(video); if (ret < 0) return ret; ret = uvc_ctrl_set(video, &xctrl); if (ret < 0) { uvc_ctrl_rollback(video); return ret; } ret = uvc_ctrl_commit(video); break; } case VIDIOC_QUERYMENU: return uvc_v4l2_query_menu(video, arg); case VIDIOC_G_EXT_CTRLS: { struct v4l2_ext_controls *ctrls = arg; struct v4l2_ext_control *ctrl = ctrls->controls; unsigned int i; ret = uvc_ctrl_begin(video); if (ret < 0) return ret; for (i = 0; i < ctrls->count; ++ctrl, ++i) { ret = uvc_ctrl_get(video, ctrl); if (ret < 0) { uvc_ctrl_rollback(video); ctrls->error_idx = i; return ret; } } ctrls->error_idx = 0; ret = uvc_ctrl_rollback(video); break; } case VIDIOC_S_EXT_CTRLS: case VIDIOC_TRY_EXT_CTRLS: { struct v4l2_ext_controls *ctrls = arg; struct v4l2_ext_control *ctrl = ctrls->controls; unsigned int i; ret = uvc_ctrl_begin(video); if (ret < 0) return ret; for (i = 0; i < ctrls->count; ++ctrl, ++i) { ret = uvc_ctrl_set(video, ctrl); if (ret < 0) { uvc_ctrl_rollback(video); ctrls->error_idx = i; return ret; } } ctrls->error_idx = 0; if (cmd == VIDIOC_S_EXT_CTRLS) ret = uvc_ctrl_commit(video); else ret = uvc_ctrl_rollback(video); break; } /* Get, Set & Enum input */ case VIDIOC_ENUMINPUT: { const struct uvc_entity *selector = video->selector; struct v4l2_input *input = arg; struct uvc_entity *iterm = NULL; u32 index = input->index; int pin = 0; if (selector == NULL || (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) { if (index != 0) return -EINVAL; iterm = list_first_entry(&video->iterms, struct uvc_entity, chain); pin = iterm->id; } else if (pin < selector->selector.bNrInPins) { pin = selector->selector.baSourceID[index]; list_for_each_entry(iterm, video->iterms.next, chain) { if (iterm->id == pin) break; } } if (iterm == NULL || iterm->id != pin) return -EINVAL; memset(input, 0, sizeof *input); input->index = index; strlcpy(input->name, iterm->name, sizeof input->name); if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA) input->type = V4L2_INPUT_TYPE_CAMERA; break; } case VIDIOC_G_INPUT: { u8 input; if (video->selector == NULL || (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) { *(int *)arg = 0; break; } ret = uvc_query_ctrl(video->dev, UVC_GET_CUR, video->selector->id, video->dev->intfnum, UVC_SU_INPUT_SELECT_CONTROL, &input, 1); if (ret < 0) return ret; *(int *)arg = input - 1; break; } case VIDIOC_S_INPUT: { u32 input = *(u32 *)arg + 1; if ((ret = uvc_acquire_privileges(handle)) < 0) return ret; if (video->selector == NULL || (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) { if (input != 1) return -EINVAL; break; } if (input == 0 || input > video->selector->selector.bNrInPins) return -EINVAL; return uvc_query_ctrl(video->dev, UVC_SET_CUR, video->selector->id, video->dev->intfnum, UVC_SU_INPUT_SELECT_CONTROL, &input, 1); } /* Try, Get, Set & Enum format */ case VIDIOC_ENUM_FMT: { struct v4l2_fmtdesc *fmt = arg; struct uvc_format *format; enum v4l2_buf_type type = fmt->type; __u32 index = fmt->index; if (fmt->type != stream->type || fmt->index >= stream->nformats) return -EINVAL; memset(fmt, 0, sizeof(*fmt)); fmt->index = index; fmt->type = type; format = &stream->format[fmt->index]; fmt->flags = 0; if (format->flags & UVC_FMT_FLAG_COMPRESSED) fmt->flags |= V4L2_FMT_FLAG_COMPRESSED; strlcpy(fmt->description, format->name, sizeof fmt->description); fmt->description[sizeof fmt->description - 1] = 0; fmt->pixelformat = format->fcc; break; } case VIDIOC_TRY_FMT: { struct uvc_streaming_control probe; if ((ret = uvc_acquire_privileges(handle)) < 0) return ret; return uvc_v4l2_try_format(stream, arg, &probe, NULL, NULL); } case VIDIOC_S_FMT: if ((ret = uvc_acquire_privileges(handle)) < 0) return ret; return uvc_v4l2_set_format(stream, arg); case VIDIOC_G_FMT: return uvc_v4l2_get_format(stream, arg); /* Frame size enumeration */ case VIDIOC_ENUM_FRAMESIZES: { struct v4l2_frmsizeenum *fsize = arg; struct uvc_format *format = NULL; struct uvc_frame *frame; int i; /* Look for the given pixel format */ for (i = 0; i < stream->nformats; i++) { if (stream->format[i].fcc == fsize->pixel_format) { format = &stream->format[i]; break; } } if (format == NULL) return -EINVAL; if (fsize->index >= format->nframes) return -EINVAL; frame = &format->frame[fsize->index]; fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE; fsize->discrete.width = frame->wWidth; fsize->discrete.height = frame->wHeight; break; } /* Frame interval enumeration */ case VIDIOC_ENUM_FRAMEINTERVALS: { struct v4l2_frmivalenum *fival = arg; struct uvc_format *format = NULL; struct uvc_frame *frame = NULL; int i; /* Look for the given pixel format and frame size */ for (i = 0; i < stream->nformats; i++) { if (stream->format[i].fcc == fival->pixel_format) { format = &stream->format[i]; break; } } if (format == NULL) return -EINVAL; for (i = 0; i < format->nframes; i++) { if (format->frame[i].wWidth == fival->width && format->frame[i].wHeight == fival->height) { frame = &format->frame[i]; break; } } if (frame == NULL) return -EINVAL; if (frame->bFrameIntervalType) { if (fival->index >= frame->bFrameIntervalType) return -EINVAL; fival->type = V4L2_FRMIVAL_TYPE_DISCRETE; fival->discrete.numerator = frame->dwFrameInterval[fival->index]; fival->discrete.denominator = 10000000; uvc_simplify_fraction(&fival->discrete.numerator, &fival->discrete.denominator, 8, 333); } else { fival->type = V4L2_FRMIVAL_TYPE_STEPWISE; fival->stepwise.min.numerator = frame->dwFrameInterval[0]; fival->stepwise.min.denominator = 10000000; fival->stepwise.max.numerator = frame->dwFrameInterval[1]; fival->stepwise.max.denominator = 10000000; fival->stepwise.step.numerator = frame->dwFrameInterval[2]; fival->stepwise.step.denominator = 10000000; uvc_simplify_fraction(&fival->stepwise.min.numerator, &fival->stepwise.min.denominator, 8, 333); uvc_simplify_fraction(&fival->stepwise.max.numerator, &fival->stepwise.max.denominator, 8, 333); uvc_simplify_fraction(&fival->stepwise.step.numerator, &fival->stepwise.step.denominator, 8, 333); } break; } /* Get & Set streaming parameters */ case VIDIOC_G_PARM: return uvc_v4l2_get_streamparm(stream, arg); case VIDIOC_S_PARM: if ((ret = uvc_acquire_privileges(handle)) < 0) return ret; return uvc_v4l2_set_streamparm(stream, arg); /* Cropping and scaling */ case VIDIOC_CROPCAP: { struct v4l2_cropcap *ccap = arg; struct uvc_frame *frame = stream->cur_frame; if (ccap->type != stream->type) return -EINVAL; ccap->bounds.left = 0; ccap->bounds.top = 0; ccap->bounds.width = frame->wWidth; ccap->bounds.height = frame->wHeight; ccap->defrect = ccap->bounds; ccap->pixelaspect.numerator = 1; ccap->pixelaspect.denominator = 1; break; } case VIDIOC_G_CROP: case VIDIOC_S_CROP: return -EINVAL; /* Buffers & streaming */ case VIDIOC_REQBUFS: { struct v4l2_requestbuffers *rb = arg; unsigned int bufsize = stream->ctrl.dwMaxVideoFrameSize; if (rb->type != stream->type || rb->memory != V4L2_MEMORY_MMAP) return -EINVAL; if ((ret = uvc_acquire_privileges(handle)) < 0) return ret; ret = uvc_alloc_buffers(&stream->queue, rb->count, bufsize); if (ret < 0) return ret; rb->count = ret; ret = 0; break; } case VIDIOC_QUERYBUF: { struct v4l2_buffer *buf = arg; if (buf->type != stream->type) return -EINVAL; if (!uvc_has_privileges(handle)) return -EBUSY; return uvc_query_buffer(&stream->queue, buf); } case VIDIOC_QBUF: if (!uvc_has_privileges(handle)) return -EBUSY; return uvc_queue_buffer(&stream->queue, arg); case VIDIOC_DQBUF: if (!uvc_has_privileges(handle)) return -EBUSY; return uvc_dequeue_buffer(&stream->queue, arg, file->f_flags & O_NONBLOCK); case VIDIOC_STREAMON: { int *type = arg; if (*type != stream->type) return -EINVAL; if (!uvc_has_privileges(handle)) return -EBUSY; ret = uvc_video_enable(stream, 1); if (ret < 0) return ret; break; } case VIDIOC_STREAMOFF: { int *type = arg; if (*type != stream->type) return -EINVAL; if (!uvc_has_privileges(handle)) return -EBUSY; return uvc_video_enable(stream, 0); } /* Analog video standards make no sense for digital cameras. */ case VIDIOC_ENUMSTD: case VIDIOC_QUERYSTD: case VIDIOC_G_STD: case VIDIOC_S_STD: case VIDIOC_OVERLAY: case VIDIOC_ENUMAUDIO: case VIDIOC_ENUMAUDOUT: case VIDIOC_ENUMOUTPUT: uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd); return -EINVAL; /* Dynamic controls. */ case UVCIOC_CTRL_ADD: { struct uvc_xu_control_info *xinfo = arg; struct uvc_control_info *info; if (!capable(CAP_SYS_ADMIN)) return -EPERM; info = kzalloc(sizeof *info, GFP_KERNEL); if (info == NULL) return -ENOMEM; memcpy(info->entity, xinfo->entity, sizeof info->entity); info->index = xinfo->index; info->selector = xinfo->selector; info->size = xinfo->size; info->flags = xinfo->flags; info->flags |= UVC_CONTROL_GET_MIN | UVC_CONTROL_GET_MAX | UVC_CONTROL_GET_RES | UVC_CONTROL_GET_DEF; ret = uvc_ctrl_add_info(info); if (ret < 0) kfree(info); break; } case UVCIOC_CTRL_MAP: { struct uvc_xu_control_mapping *xmap = arg; struct uvc_control_mapping *map; if (!capable(CAP_SYS_ADMIN)) return -EPERM; map = kzalloc(sizeof *map, GFP_KERNEL); if (map == NULL) return -ENOMEM; map->id = xmap->id; memcpy(map->name, xmap->name, sizeof map->name); memcpy(map->entity, xmap->entity, sizeof map->entity); map->selector = xmap->selector; map->size = xmap->size; map->offset = xmap->offset; map->v4l2_type = xmap->v4l2_type; map->data_type = xmap->data_type; ret = uvc_ctrl_add_mapping(map); if (ret < 0) kfree(map); break; } case UVCIOC_CTRL_GET: return uvc_xu_ctrl_query(video, arg, 0); case UVCIOC_CTRL_SET: return uvc_xu_ctrl_query(video, arg, 1); default: if ((ret = v4l_compat_translate_ioctl(file, cmd, arg, uvc_v4l2_do_ioctl)) == -ENOIOCTLCMD) uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n", cmd); return ret; } return ret; } static long uvc_v4l2_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { if (uvc_trace_param & UVC_TRACE_IOCTL) { uvc_printk(KERN_DEBUG, "uvc_v4l2_ioctl("); v4l_printk_ioctl(cmd); printk(")\n"); } return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl); } static ssize_t uvc_v4l2_read(struct file *file, char __user *data, size_t count, loff_t *ppos) { uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n"); return -ENODEV; } /* * VMA operations. */ static void uvc_vm_open(struct vm_area_struct *vma) { struct uvc_buffer *buffer = vma->vm_private_data; buffer->vma_use_count++; } static void uvc_vm_close(struct vm_area_struct *vma) { struct uvc_buffer *buffer = vma->vm_private_data; buffer->vma_use_count--; } static struct vm_operations_struct uvc_vm_ops = { .open = uvc_vm_open, .close = uvc_vm_close, }; static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma) { struct uvc_fh *handle = (struct uvc_fh *)file->private_data; struct uvc_streaming *stream = handle->stream; struct uvc_video_queue *queue = &stream->queue; struct uvc_buffer *uninitialized_var(buffer); struct page *page; unsigned long addr, start, size; unsigned int i; int ret = 0; uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n"); start = vma->vm_start; size = vma->vm_end - vma->vm_start; mutex_lock(&queue->mutex); for (i = 0; i < queue->count; ++i) { buffer = &queue->buffer[i]; if ((buffer->buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff) break; } if (i == queue->count || size != queue->buf_size) { ret = -EINVAL; goto done; } /* * VM_IO marks the area as being an mmaped region for I/O to a * device. It also prevents the region from being core dumped. */ vma->vm_flags |= VM_IO; addr = (unsigned long)queue->mem + buffer->buf.m.offset; while (size > 0) { page = vmalloc_to_page((void *)addr); if ((ret = vm_insert_page(vma, start, page)) < 0) goto done; start += PAGE_SIZE; addr += PAGE_SIZE; size -= PAGE_SIZE; } vma->vm_ops = &uvc_vm_ops; vma->vm_private_data = buffer; uvc_vm_open(vma); done: mutex_unlock(&queue->mutex); return ret; } static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait) { struct uvc_fh *handle = (struct uvc_fh *)file->private_data; struct uvc_streaming *stream = handle->stream; uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n"); return uvc_queue_poll(&stream->queue, file, wait); } const struct v4l2_file_operations uvc_fops = { .owner = THIS_MODULE, .open = uvc_v4l2_open, .release = uvc_v4l2_release, .ioctl = uvc_v4l2_ioctl, .read = uvc_v4l2_read, .mmap = uvc_v4l2_mmap, .poll = uvc_v4l2_poll, };