No.
Mac OS X -> Darwin -> FreeBSD
Just because systems are Unix-like and use ls/grep/pwd, doesn't mean they are cross-compatible. Mac OS X is in the vein of true Unix systems along with Solaris/AIX/HP-UX/FreeBSD (to a lesser extent). Linux is based very loosely on these, and can hardly be considered a Unix system. It'd be much easier to port FreeBSD drivers to Mac OS X, but even then it's still a huge endeavor.
Now, that being said, Mac OS X has a full set of APIs, and Atheros' drivers are completely open source, so everything you need is there, and you're more than welcome to get writing the drivers!