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CDC-Only CEC devices are CEC devices that can only handle CDC messages, all other messages are ignored. Add a flag to signal that this is a CDC-Only device and act accordingly. Also add helper functions to identify if a CEC device is configured as a CDC-Only device, a second TV, a switch or a processor, since these variations cannot be determined by the logical address alone. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>