libcamera: pipeline_handler: uvcvideo: register all Cameras along with a devnum

Register all UVC Cameras along with their device numbers, to eventually
allow the V4L2 compatibility layer to match against it.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

src/libcamera/pipeline/uvcvideo.cpp

@@ -7,6 +7,7 @@
 
 #include <algorithm>
 #include <iomanip>
+#include <sys/sysmacros.h>
 #include <tuple>
 
 #include <libcamera/camera.h>
@@ -309,10 +310,12 @@ bool PipelineHandlerUVC::match(DeviceEnumerator *enumerator)
 	if (data->init(*entity))
 		return false;
 
+	dev_t devnum = makedev((*entity)->deviceMajor(), (*entity)->deviceMinor());
+
 	/* Create and register the camera. */
 	std::set<Stream *> streams{ &data->stream_ };
 	std::shared_ptr<Camera> camera = Camera::create(this, media->model(), streams);
-	registerCamera(std::move(camera), std::move(data));
+	registerCamera(std::move(camera), std::move(data), devnum);
 
 	/* Enable hot-unplug notifications. */
 	hotplugMediaDevice(media);