Mac driver development

The Apple Hardware & Drivers page has lots of information about Mac driver development. It should be enough to get you started. Some of the highlights:

• Getting Started - A guided learning path for hardware and driver developers new to Mac OS X.

• Frameworks - API references organized by framework.

• USB Sample Code - Resources for developing USB devices and software to access them.

• FireWire Sample Code - Resources for developing FireWire devices and software to access them.

Start here http://developer.apple.com/documentation/Darwin/Conceptual/KernelProgramming/About/About.html

Mac development is generally done using Xcode, as it handles various Mac-specific concepts like bundles and frameworks. You will most likely be working in pure C. You will not be using Cocoa for driver development, as that is an application-oriented framework.