Serine/threonine haspin-like protein kinase involved in cell cycle regulation. Acts in chromosomal passenger complex (CPC) targeting to centromeres by phosphorylating histone H3 at 'Thr3' (H3T3ph). ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] Interacts with pds5 and swi6. Belongs to the protein kinase superfamily. Ser/Thr protein kinase family. Haspin subfamily.