New enums

Steam now supports the Switch controller. But you need to extend the enums to get it working. The extensions to the enums are reported in the forums:

	public enum EControllerActionOrigin : int {
		...
		k_EControllerActionOrigin_SteamV2_Gyro_Roll, 
		
		// Switch - Pro or Joycons used as a single input device. 
		// This does not apply to a single joycon 
		k_EControllerActionOrigin_Switch_A, 
		k_EControllerActionOrigin_Switch_B, 
		k_EControllerActionOrigin_Switch_X, 
		k_EControllerActionOrigin_Switch_Y, 
		k_EControllerActionOrigin_Switch_LeftBumper, 
		k_EControllerActionOrigin_Switch_RightBumper, 
		k_EControllerActionOrigin_Switch_Plus,  //Start 
		k_EControllerActionOrigin_Switch_Minus,  //Back 
		k_EControllerActionOrigin_Switch_Capture, 
		k_EControllerActionOrigin_Switch_LeftTrigger_Pull, 
		k_EControllerActionOrigin_Switch_LeftTrigger_Click, 
		k_EControllerActionOrigin_Switch_RightTrigger_Pull, 
		k_EControllerActionOrigin_Switch_RightTrigger_Click, 
		k_EControllerActionOrigin_Switch_LeftStick_Move, 
		k_EControllerActionOrigin_Switch_LeftStick_Click, 
		k_EControllerActionOrigin_Switch_LeftStick_DPadNorth, 
		k_EControllerActionOrigin_Switch_LeftStick_DPadSouth, 
		k_EControllerActionOrigin_Switch_LeftStick_DPadWest, 
		k_EControllerActionOrigin_Switch_LeftStick_DPadEast, 
		k_EControllerActionOrigin_Switch_RightStick_Move, 
		k_EControllerActionOrigin_Switch_RightStick_Click, 
		k_EControllerActionOrigin_Switch_RightStick_DPadNorth, 
		k_EControllerActionOrigin_Switch_RightStick_DPadSouth, 
		k_EControllerActionOrigin_Switch_RightStick_DPadWest, 
		k_EControllerActionOrigin_Switch_RightStick_DPadEast, 
		k_EControllerActionOrigin_Switch_DPad_North, 
		k_EControllerActionOrigin_Switch_DPad_South, 
		k_EControllerActionOrigin_Switch_DPad_West, 
		k_EControllerActionOrigin_Switch_DPad_East, 
		k_EControllerActionOrigin_Switch_ProGyro_Move,  // Primary Gyro in Pro Controller, or Right JoyCon 
		k_EControllerActionOrigin_Switch_ProGyro_Pitch,  // Primary Gyro in Pro Controller, or Right JoyCon 
		k_EControllerActionOrigin_Switch_ProGyro_Yaw,  // Primary Gyro in Pro Controller, or Right JoyCon 
		k_EControllerActionOrigin_Switch_ProGyro_Roll,  // Primary Gyro in Pro Controller, or Right JoyCon 
		// Switch JoyCon Specific 
		k_EControllerActionOrigin_Switch_RightGyro_Move,  // Right JoyCon Gyro generally should correspond to Pro's single gyro 
		k_EControllerActionOrigin_Switch_RightGyro_Pitch,  // Right JoyCon Gyro generally should correspond to Pro's single gyro 
		k_EControllerActionOrigin_Switch_RightGyro_Yaw,  // Right JoyCon Gyro generally should correspond to Pro's single gyro 
		k_EControllerActionOrigin_Switch_RightGyro_Roll,  // Right JoyCon Gyro generally should correspond to Pro's single gyro 
		k_EControllerActionOrigin_Switch_LeftGyro_Move, 
		k_EControllerActionOrigin_Switch_LeftGyro_Pitch,
		k_EControllerActionOrigin_Switch_LeftGyro_Yaw, 
		k_EControllerActionOrigin_Switch_LeftGyro_Roll, 
		k_EControllerActionOrigin_Switch_LeftGrip_Lower,  // Left JoyCon SR Button 
		k_EControllerActionOrigin_Switch_LeftGrip_Upper,  // Left JoyCon SL Button 
		k_EControllerActionOrigin_Switch_RightGrip_Lower,  // Right JoyCon SL Button 
		k_EControllerActionOrigin_Switch_RightGrip_Upper,  // Right JoyCon SR Button 
		k_EControllerActionOrigin_Count,  // If Steam has added support for new controllers origins will go here. 
		k_EControllerActionOrigin_MaximumPossibleValue = 32767,  // Origins are currently a maximum of 16 bits.	
	}

	...

	public enum ESteamInputType : int {
		k_ESteamInputType_Unknown,
		k_ESteamInputType_SteamController,
		k_ESteamInputType_XBox360Controller,
		k_ESteamInputType_XBoxOneController,
		k_ESteamInputType_GenericXInput,
		k_ESteamInputType_PS4Controller,
		k_ESteamInputType_AppleMFiController, 
		k_ESteamInputType_AndroidController, 
		k_ESteamInputType_Reserved1, 
		k_ESteamInputType_Reserved2, 
		k_ESteamInputType_SwitchProController
	}

[rlabrecque]

Should be updated as of 1.43!

[KelsamGames]

The most up-to-date enum for the InputDevice is:

enum ESteamInputType
{
	k_ESteamInputType_Unknown,
	k_ESteamInputType_SteamController,
	k_ESteamInputType_XBox360Controller,
	k_ESteamInputType_XBoxOneController,
	k_ESteamInputType_GenericGamepad,		// DirectInput controllers
	k_ESteamInputType_PS4Controller,
	k_ESteamInputType_AppleMFiController,	// Unused
	k_ESteamInputType_AndroidController,	// Unused
	k_ESteamInputType_SwitchJoyConPair,		// Unused
	k_ESteamInputType_SwitchJoyConSingle,	// Unused
	k_ESteamInputType_SwitchProController,
	k_ESteamInputType_MobileTouch,			// Steam Link App On-screen Virtual Controller
	k_ESteamInputType_PS3Controller,		// Currently uses PS4 Origins
};

Notably, k_ESteamInputType_GenericXInput seems to be changed to k_ESteamInputType_GenericGamepad for the next SDK version. I believe the reason for this (as far as my testing can show) is that actual Generic X Input devices are reported to be x360 devices. So, only actual DirectInput devices would report value 4 (this also reflects my testing experience).

It’s also noted that k_ESteamInputType_AppleMFiController and k_ESteamInputType_AndroidController should be reported by Steam when Steam Link Touch is used, but thus far I’ve only ever received an 11 report (which will be k_ESteamInputType_MobileTouch), so probably best to either catch-all, or at least make sure to also capture value 11 as a “generic Steam Link Touch device”