WinDriver calls this function when a new device, matching the given criteria, is attached, provided it is not yet controlled by another driver.
This callback is called once for each matching interface.

typedef BOOL (DLLCALLCONV *WDU_ATTACH_CALLBACK)(
    WDU_DEVICE_HANDLE hDevice,
    WDU_DEVICE *pDeviceInfo,
    PVOID pUserData);

If the WD_ACKNOWLEDGE flag was set in the call to WDU_Init() [B.4.1] (within the dwOptions parameter), the callback function should check if it wants to control the device, and if so return TRUE (otherwise — return FALSE).
If the WD_ACKNOWLEDGE flag was not set in the call to WDU_Init(), then the return value of the callback function is insignificant.

WinDriver calls this function when a controlled device has been detached from the system.

typedef void (DLLCALLCONV *WDU_DETACH_CALLBACK)(
    WDU_DEVICE_HANDLE hDevice,
    PVOID pUserData);

None

WinDriver calls this function when a controlled device has changed its power settings.

typedef BOOL (DLLCALLCONV *WDU_POWER_CHANGE_CALLBACK)(
    WDU_DEVICE_HANDLE hDevice,
    DWORD dwPowerState,
    PVOID pUserData);

TRUE/FALSE. Currently there is no significance to the return value.

This callback is supported only on Windows.