The PowerA Nintendo Switch Fusion Pro Controller has a working USB mode, enabled via the switch on the underside of the controller.

src/joystick/SDL_joystick.c

@@ -2350,7 +2350,6 @@ SDL_bool SDL_ShouldIgnoreJoystick(const char *name, SDL_JoystickGUID guid)
         MAKE_VIDPID(0x04d9, 0x8009),  /* OBINLB USB-HID Keyboard */
 
         MAKE_VIDPID(0x0e6f, 0x0186),  /* PDP Afterglow Wireless Switch Controller - USB charging, no input */
-        MAKE_VIDPID(0x20d6, 0xa716),  /* PowerA Nintendo Switch Fusion Pro Controller - USB charging, no input */
     };
 
     unsigned int i;

src/joystick/controller_type.h

@@ -581,7 +581,7 @@ static const ControllerDescription_t arrControllers[] = {
 	{ MAKE_CONTROLLER_ID( 0x20d6, 0xa712 ), k_eControllerType_SwitchInputOnlyController, NULL },  // PowerA Nintendo Switch Fusion Fight Pad
 	{ MAKE_CONTROLLER_ID( 0x20d6, 0xa713 ), k_eControllerType_SwitchInputOnlyController, NULL },  // PowerA Super Mario Controller
 	{ MAKE_CONTROLLER_ID( 0x20d6, 0xa714 ), k_eControllerType_SwitchInputOnlyController, NULL },  // PowerA Nintendo Switch Spectra Controller
-	{ MAKE_CONTROLLER_ID( 0x20d6, 0xa716 ), k_eControllerType_SwitchInputOnlyController, NULL },  // PowerA Nintendo Switch Fusion Pro Controller - USB charging, no input
+	{ MAKE_CONTROLLER_ID( 0x20d6, 0xa716 ), k_eControllerType_SwitchInputOnlyController, NULL },  // PowerA Nintendo Switch Fusion Pro Controller
 	{ MAKE_CONTROLLER_ID( 0x0e6f, 0x0186 ), k_eControllerType_SwitchProController, NULL },  // PDP Afterglow Wireless Switch Controller - working gyro. USB doesn't work
 	{ MAKE_CONTROLLER_ID( 0x0e6f, 0x0184 ), k_eControllerType_SwitchInputOnlyController, NULL },  // PDP Faceoff Wired Deluxe+ Audio Controller
 	{ MAKE_CONTROLLER_ID( 0x0f0d, 0x00aa ), k_eControllerType_SwitchInputOnlyController, NULL },  // HORI Real Arcade Pro V Hayabusa in Switch Mode