i'm going to write this from the perspective of the returning student, not the parent. it's only been a handful of years since i was in your son's shoes, so hopefully this can give you some different, and helpful, insight.
when you send someone away to college at 17, 18, or 19, you are telling them without words that you trust them, you want them to learn and to succeed. that means both inside and outside of the classroom. the first semester is such a learning experience...away from friends and family, meeting people you have a totally different background from, and living with someone 24/7 who is not a relative. major, major adjustment for anyone. during those 15 weeks, a person learns a lot about themselves, and what they learned from their family. they learn the consequences of not studying and doing their work, and what happens when they spend hours playing playstation or partying during the week. in return, they realize why their parents made them do certain things (like eat right, finish your homework before you go and play, etc...) and they come to respect that.
returning home is hard, because since august (or september) they've been the responsible ones...doing their laundry, finding their own food, getting themselves up in the morning for class and making sure they got a respectable amount of sleep so they could function. now, someone is trying to tell them, "great, glad your doing well! remember, you have to be home by 11, i expect you to be up before 10, and you're responsible for cleaning the kitchen/shoveling the snow/insert task here the whole time you are home!". that's a tough pill to swallow.
once your son has been gone for a few weeks, take some time to think about what happened. list your previous expectations, then list the way things really went. then, make a list of absolutes that cannot be bargained (overnight guests staying in the same room, out past 2AM, not doing own laundry, whatever). then, ask your son to do the same. after you both have this, compare notes. maybe he didn't realize that you had hoped he'd take over doing the laundry, and would be more than happy to do it the next time. the point is to create a dialogue, and truly remember that he is an adult.
whatever you come up with now will have to evolve over the next 4 years or so. summers are differnt than the fall/spring semester split...they are longer in time, a whole year has passed, and most likely your son will be working in the summers, even if he doesn't during the holiday break.
respect his wishes, and he'll respect yours. my mom gave me a lot of latitude, starting with my senior year in high school. i always respected what she allowed me to do, and i followed her other rules. in return, she gave me more freedom and asked for help with house stuff, instead of demanding or expecting the help.
good luck, and remember that as your son grows up he'll change, and eventually he'll be even more helpful than you thought he would ever be!