Porting driver from Linux to QNX

How complicated would it be to port a device driver from Linux to QNX? Can anyone help me with that?

Impossible to say, in some cases it takes 15 minutes in others it`s almost a complete rewrite.

Will also depend on the type of driver, type of device, the quality of the Linux code and like the skill and experience of the programmer. Having some good hardware specs never hurts either.