#Applicability
First, this driver is totally untested on El Capitan and later. I've not had time to update it, but the reports I've seen suggest that some work is needed to get it working there.
If you just want to use the adapter in Dolphin, and not as USB controllers in other emulators or games, it is much simpler to just follow the instructions on the Dolphin Wiki, which does work on El Capitan.
#How to use
If downloading from source, then you will need Xcode to build. Open the project up, and compile it (i.e. click the play button in the top right hand corner).
Then run ./makedmg.sh. This will create a folder called dmg, as well
as a dmg, which you can ignore. Open the folder titled dmg, and run
install.sh as root. Restart your computer, and plug in your
Wii U adapter!
#Uninstallation
Running uninstall.sh as root and rebooting will revert your Mac to its previous
state.
This installs three components.
##A launchagent
This is installed to /Library/LaunchAgents/com.area.gamecubeAdapter.plist. This causes the userspace driver to start every time the adapter is plugged it. The userspace driver exits when the adapter is unplugged.
##The userspace driver
The userspace driver and its supporting frameworks are installed to /Applications/wiiu-gcc-adapter. This is the program that actually interprets the data received by the adapter and maps it onto fake HID controllers.
##The kext This is an unsigned Kext that prevents the kernel from grabbing the USB adapter, which means we are able to access it from userspace.
Note that the install script also sets nvram boot-args=kext-dev-mode=1, which allows this unsigned kext to be installed and loaded. This will allow all unsigned kexts to be loaded on your system. I have joined the Apple Developer's Program so that hopefully I will be able to sign this Kext in the future and remove this limitation.
If you wish to contribute to that membership, or otherwise show support for this driver, you can make a bitcoin payment to 1J7Xxv4Er2mnatbGXZpLtV4JJqq6UdS6tG.
##Thanks
- Mitch Dzugan for the original userspace implementation of the driver (i.e. the repository this is originally forked from)
- Original testers on GBATemp and Reddit