// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* uvc_metadata.c -- USB Video Class driver - Metadata handling
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*
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* Copyright (C) 2016
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* Guennadi Liakhovetski (guennadi.liakhovetski@intel.com)
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*/
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/usb.h>
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#include <linux/videodev2.h>
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#include <media/v4l2-ioctl.h>
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#include <media/videobuf2-v4l2.h>
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#include <media/videobuf2-vmalloc.h>
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#include "uvcvideo.h"
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/* -----------------------------------------------------------------------------
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* V4L2 ioctls
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*/
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static int uvc_meta_v4l2_querycap(struct file *file, void *fh,
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struct v4l2_capability *cap)
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{
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struct v4l2_fh *vfh = file->private_data;
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struct uvc_streaming *stream = video_get_drvdata(vfh->vdev);
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struct uvc_video_chain *chain = stream->chain;
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strscpy(cap->driver, "uvcvideo", sizeof(cap->driver));
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strscpy(cap->card, vfh->vdev->name, sizeof(cap->card));
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usb_make_path(stream->dev->udev, cap->bus_info, sizeof(cap->bus_info));
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cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
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| chain->caps;
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return 0;
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}
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static int uvc_meta_v4l2_get_format(struct file *file, void *fh,
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struct v4l2_format *format)
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{
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struct v4l2_fh *vfh = file->private_data;
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struct uvc_streaming *stream = video_get_drvdata(vfh->vdev);
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struct v4l2_meta_format *fmt = &format->fmt.meta;
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if (format->type != vfh->vdev->queue->type)
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return -EINVAL;
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memset(fmt, 0, sizeof(*fmt));
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fmt->dataformat = stream->meta.format;
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fmt->buffersize = UVC_METADATA_BUF_SIZE;
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return 0;
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}
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static int uvc_meta_v4l2_try_format(struct file *file, void *fh,
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struct v4l2_format *format)
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{
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struct v4l2_fh *vfh = file->private_data;
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struct uvc_streaming *stream = video_get_drvdata(vfh->vdev);
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struct uvc_device *dev = stream->dev;
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struct v4l2_meta_format *fmt = &format->fmt.meta;
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u32 fmeta = fmt->dataformat;
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if (format->type != vfh->vdev->queue->type)
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return -EINVAL;
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memset(fmt, 0, sizeof(*fmt));
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fmt->dataformat = fmeta == dev->info->meta_format
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? fmeta : V4L2_META_FMT_UVC;
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fmt->buffersize = UVC_METADATA_BUF_SIZE;
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return 0;
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}
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static int uvc_meta_v4l2_set_format(struct file *file, void *fh,
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struct v4l2_format *format)
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{
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struct v4l2_fh *vfh = file->private_data;
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struct uvc_streaming *stream = video_get_drvdata(vfh->vdev);
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struct v4l2_meta_format *fmt = &format->fmt.meta;
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int ret;
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ret = uvc_meta_v4l2_try_format(file, fh, format);
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if (ret < 0)
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return ret;
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/*
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* We could in principle switch at any time, also during streaming.
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* Metadata buffers would still be perfectly parseable, but it's more
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* consistent and cleaner to disallow that.
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*/
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mutex_lock(&stream->mutex);
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if (uvc_queue_allocated(&stream->queue))
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ret = -EBUSY;
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else
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stream->meta.format = fmt->dataformat;
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mutex_unlock(&stream->mutex);
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return ret;
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}
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static int uvc_meta_v4l2_enum_formats(struct file *file, void *fh,
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struct v4l2_fmtdesc *fdesc)
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{
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struct v4l2_fh *vfh = file->private_data;
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struct uvc_streaming *stream = video_get_drvdata(vfh->vdev);
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struct uvc_device *dev = stream->dev;
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u32 index = fdesc->index;
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if (fdesc->type != vfh->vdev->queue->type ||
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index > 1U || (index && !dev->info->meta_format))
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return -EINVAL;
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memset(fdesc, 0, sizeof(*fdesc));
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fdesc->type = vfh->vdev->queue->type;
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fdesc->index = index;
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fdesc->pixelformat = index ? dev->info->meta_format : V4L2_META_FMT_UVC;
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return 0;
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}
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static const struct v4l2_ioctl_ops uvc_meta_ioctl_ops = {
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.vidioc_querycap = uvc_meta_v4l2_querycap,
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.vidioc_g_fmt_meta_cap = uvc_meta_v4l2_get_format,
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.vidioc_s_fmt_meta_cap = uvc_meta_v4l2_set_format,
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.vidioc_try_fmt_meta_cap = uvc_meta_v4l2_try_format,
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.vidioc_enum_fmt_meta_cap = uvc_meta_v4l2_enum_formats,
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.vidioc_reqbufs = vb2_ioctl_reqbufs,
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.vidioc_querybuf = vb2_ioctl_querybuf,
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.vidioc_qbuf = vb2_ioctl_qbuf,
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.vidioc_dqbuf = vb2_ioctl_dqbuf,
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.vidioc_create_bufs = vb2_ioctl_create_bufs,
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.vidioc_prepare_buf = vb2_ioctl_prepare_buf,
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.vidioc_streamon = vb2_ioctl_streamon,
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.vidioc_streamoff = vb2_ioctl_streamoff,
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};
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/* -----------------------------------------------------------------------------
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* V4L2 File Operations
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*/
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static const struct v4l2_file_operations uvc_meta_fops = {
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.owner = THIS_MODULE,
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.unlocked_ioctl = video_ioctl2,
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.open = v4l2_fh_open,
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.release = vb2_fop_release,
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.poll = vb2_fop_poll,
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.mmap = vb2_fop_mmap,
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};
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int uvc_meta_register(struct uvc_streaming *stream)
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{
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struct uvc_device *dev = stream->dev;
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struct video_device *vdev = &stream->meta.vdev;
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struct uvc_video_queue *queue = &stream->meta.queue;
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stream->meta.format = V4L2_META_FMT_UVC;
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/*
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* The video interface queue uses manual locking and thus does not set
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* the queue pointer. Set it manually here.
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*/
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vdev->queue = &queue->queue;
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return uvc_register_video_device(dev, stream, vdev, queue,
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V4L2_BUF_TYPE_META_CAPTURE,
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&uvc_meta_fops, &uvc_meta_ioctl_ops);
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}
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