Here are the data structures with brief descriptions:

rotary_encoder_event_t	Struct represents a queued event, used to communicate current position to a waiting task
rotary_encoder_info_t	Struct carries all the information needed by this driver to manage the rotary encoder device. The fields of this structure should not be accessed directly
rotary_encoder_state_t	Struct represents the current state of the device in terms of incremental position and direction of last movement