Wii U GamePad is not too difficult to reverse-engineer, says Dolphin developer - Polygon
Classic Controller - Wikipedia
Metroid Prime 3 XBOX controller settings : r/DolphinEmulator
Not detecting controller input in-game
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Steam Community :: Guide :: Dolphin Emulator with Steam controller!
You Can Relive the GameCube on a Modern TV, and It's Amazing
Problem with Xbox One Controller in Dolphin Emulator : r/DolphinEmulator
Amazon.com: Veanic 2.4G Wireless Gamecube Controller Gamepad Gaming Joystick with Receiver for Nintendo Gamecube,Compatible with Wii (Silver) : Video Games
How to Play Wii and GameCube Games on your PC with Dolphin
Using controller configuration for Wii Games? : r/DolphinEmulator