most Adaptec drivers are already in kernel, adaptec are pretty open source friendly usually (they were the first one to provide linux drivers, some years ago). Just do a search on google to find out what module (driver) you need to load, it is probably not named "adaptec" as new SCSI drivers support severals cards at once.
If this help you, I have a Adaptec 2940U (not raid) and the driver is aic7xxx
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