Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 2180f92d authored by Hans Verkuil's avatar Hans Verkuil Committed by Mauro Carvalho Chehab
Browse files

[media] v4l2-core: add code to check for specific ops 



This patch adds a v4l2_subdev_has_op() macro and a v4l2_device_has_op macro to
quickly check if a specific subdev or any subdev supports a particular subdev
operation.
This makes it easy for drivers to disable certain ioctls if none of the subdevs
supports the necessary functionality.

Signed-off-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 6cd247ef

include/media/v4l2-device.h

+13 −0
Original line number Diff line number Diff line
@@ -190,4 +190,17 @@ v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev); 
			##args);					\

})



#define v4l2_device_has_op(v4l2_dev, o, f)				\

({									\

	struct v4l2_subdev *__sd;					\

	bool __result = false;						\

	list_for_each_entry(__sd, &(v4l2_dev)->subdevs, list) {		\

		if (v4l2_subdev_has_op(__sd, o, f)) {			\

			__result = true;				\

			break;						\

		}							\

	}								\

	__result;							\

})



#endif

include/media/v4l2-subdev.h

+3 −0
Original line number Diff line number Diff line
@@ -687,4 +687,7 @@ void v4l2_subdev_init(struct v4l2_subdev *sd, 
	((!(sd) || !(sd)->v4l2_dev || !(sd)->v4l2_dev->notify) ? -ENODEV : \

	 (sd)->v4l2_dev->notify((sd), (notification), (arg)))



#define v4l2_subdev_has_op(sd, o, f) \

	((sd)->ops->o && (sd)->ops->o->f)



#endif