I will add to this...do not scrimp on the time you spend with him...take time off from work if possible.
My parents were emotionaly abusive to me as a child...and I was angry about it.
Looking back I suspect my dad was symptomatic in the time leading up to his dropping dead...he kept trying to reachout, suggesting going on outings that I felt were more suited for a five year old rather than an adult child (things like going "fishing" at a catfish farm.) I rebuffed many, went on a few, I was angry with him over his attitude towards me over much of my childhood.
I probably should have gone on all the outings he wanted.