Sorry for answering so late. I was expecting to recieve an e-mail if someone answered.
Well, I've looked for some specs, but AFAIK there aren't any, and the web page of the company doesn't work anymore. The only way to get it working under Linux is using ndiswrapper, but the drivers (or ndiswrapper) can't get associated with the AP, so I thought about trying to reverse-engineer the driver.