For a start, I would ask him for things he might want or need so that you can tell others who might come to see him. When people asked my son if he needed anything, he hesitated to ask, but when he did name specific things, the friends were really glad to bring him something they knew would be appreciated - like a battery for some gadget he had, books, funny movie, etc. Recovering from depression can't be done all at once, but it takes small, slow steps. A gentle hug, but ask him first in case he's sore anyplace.