You can download the source code for the wireless adapter at this link
Note, this is for
for Kernel 2.6.37(and earlier)
if your kernel is newer, it probably will not work. Determine the level of kernel in a command shell with the command 'uname -a' ( without the quotes ).
This is source code, inside the .zip file you will find various files that tell you how to compile the driver for your system.
Note: I also found this link to the source file, not sure which one is best.
This one looks good, it also includes fireware, that is code the device needs to operate.
Just so you know, I don't have one of these devices, I just googled it.
Best of luck compiling the code.