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path: root/drivers/media/usb/uvc/uvc_metadata.c
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Diffstat (limited to 'drivers/media/usb/uvc/uvc_metadata.c')
-rw-r--r--drivers/media/usb/uvc/uvc_metadata.c179
1 files changed, 179 insertions, 0 deletions
diff --git a/drivers/media/usb/uvc/uvc_metadata.c b/drivers/media/usb/uvc/uvc_metadata.c
new file mode 100644
index 000000000000..cd1aec19cc5b
--- /dev/null
+++ b/drivers/media/usb/uvc/uvc_metadata.c
@@ -0,0 +1,179 @@
+/*
+ * 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;
+
+ strlcpy(cap->driver, "uvcvideo", sizeof(cap->driver));
+ strlcpy(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->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->meta_format))
+ return -EINVAL;
+
+ memset(fdesc, 0, sizeof(*fdesc));
+
+ fdesc->type = vfh->vdev->queue->type;
+ fdesc->index = index;
+ fdesc->pixelformat = index ? dev->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);
+}