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Now that entities have a main function, expose it via MEDIA_IOC_G_TOPOLOGY ioctl. Please notice that some entities may have secundary functions. Such use case will be addressed later, when we add support for the Media Controller properties. Acked-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>