The former Robins captain made the season-long loan move to St Andrew's on August's transfer deadline day after a disagreement with Paolo Di Canio and is hoping to make his stay with Blues a permanent one.
"I'm here until the end of the season, we just need to wait and see what happens to be honest," he said.
"Obviously the window opens in January, I don't think I'll be welcome back at Swindon, that's for sure.
"I'll be looking to play as many games for Birmingham and try to get myself a permanent move here."
Caddis made a quick recovery from a shoulder injury sustained in September and has started their last three Championship games.