NtGetDevicePowerState - NtDoc

#ifndef _NTPOAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
NtGetDevicePowerState(
    _In_ HANDLE Device,
    _Out_ PDEVICE_POWER_STATE State
    );

#endif
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#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwGetDevicePowerState(
    _In_ HANDLE Device,
    _Out_ PDEVICE_POWER_STATE State
    );

#endif
View code on GitHub