libcamera: v4l2_subdevice: Store media entity

Store the media entity backing the V4L2Subdevice and add a deviceName()
method to retrieve the human readable name of the subdevice, which is
created using the name of the associated media entity.

Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>

1 files changed, 5 insertions, 3 deletions

diff --git a/src/libcamera/include/v4l2_subdevice.h b/src/libcamera/include/v4l2_subdevice.h
index 82fa6685..eac699a0 100644
--- a/src/libcamera/include/v4l2_subdevice.h
+++ b/src/libcamera/include/v4l2_subdevice.h
@@ -9,9 +9,10 @@
 
 #include <string>
 
+#include "media_object.h"
+
 namespace libcamera {
 
-class MediaEntity;
 struct Rectangle;
 
 struct V4L2SubdeviceFormat {
@@ -31,7 +32,8 @@ public:
 	bool isOpen() const;
 	void close();
 
-	std::string deviceNode() const { return deviceNode_; }
+	std::string deviceNode() const { return entity_->deviceNode(); }
+	std::string deviceName() const { return entity_->name(); }
 
 	int setCrop(unsigned int pad, Rectangle *rect);
 	int setCompose(unsigned int pad, Rectangle *rect);
@@ -43,7 +45,7 @@ private:
 	int setSelection(unsigned int pad, unsigned int target,
 			 Rectangle *rect);
 
-	std::string deviceNode_;
+	const MediaEntity *entity_;
 	int fd_;
 };