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