[media] uvcvideo: Set device_caps in VIDIOC_QUERYCAP

Set the capabilities field to global capabilities, and the device_caps
field to the video node capabilities.
This issue was found by the v4l2-compliance tool.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/usb/uvc/uvc_driver.c

@@ -1741,6 +1741,11 @@ static int uvc_register_video(struct uvc_device *dev,
 		return ret;
 	}
 
+	if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		stream->chain->caps |= V4L2_CAP_VIDEO_CAPTURE;
+	else
+		stream->chain->caps |= V4L2_CAP_VIDEO_OUTPUT;
+
 	atomic_inc(&dev->nstreams);
 	return 0;
 }

drivers/media/usb/uvc/uvc_v4l2.c

@@ -565,12 +565,14 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 		usb_make_path(stream->dev->udev,
 			      cap->bus_info, sizeof(cap->bus_info));
 		cap->version = LINUX_VERSION_CODE;
+		cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
+				  | chain->caps;
 		if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
-			cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
-					  | V4L2_CAP_STREAMING;
+			cap->device_caps = V4L2_CAP_VIDEO_CAPTURE
+					 | V4L2_CAP_STREAMING;
 		else
-			cap->capabilities = V4L2_CAP_VIDEO_OUTPUT
-					  | V4L2_CAP_STREAMING;
+			cap->device_caps = V4L2_CAP_VIDEO_OUTPUT
+					 | V4L2_CAP_STREAMING;
 		break;
 	}
 

drivers/media/usb/uvc/uvcvideo.h

@@ -371,6 +371,8 @@ struct uvc_video_chain {
 	struct uvc_entity *selector;		/* Selector unit */
 
 	struct mutex ctrl_mutex;		/* Protects ctrl.info */
+
+	u32 caps;				/* V4L2 chain-wide caps */
 };
 
 struct uvc_stats_frame {