My question involves labor and employment law for the state of: Washington

Okay.I was injured(not at work) on Oct 31, 2009. Brain injury.Cognitive issues, Short term Memory issues and a bunch of other stuff. I am out on FMLA. In my department at work there are 6 "stations". Someone is posted at these stations all the time. I can not data input, (that is 5 of the stations) but I can do the other station. My Dr gave me a note for my employer telling them that I can come back to work, full time but only at the stations without data input. My employer said no, and is not letting me work. There is no "light duty" policy for my department. Having me work this station would not be interfering with seniority, or cause any hardships what so ever. I would be doing my own job, minus rotating to the other stations. If you need more info let me know, this is the short version. Is this legal?