WdfDeviceSetPowerCapabilities function (wdfdevice.h)

Artikel
02/22/2024

[Applies to KMDF and UMDF]

The WdfDeviceSetPowerCapabilities method reports a device's power capabilities.

Syntax

void WdfDeviceSetPowerCapabilities(
  [in] WDFDEVICE                      Device,
  [in] PWDF_DEVICE_POWER_CAPABILITIES PowerCapabilities
);

Parameters

[in] Device

A handle to a framework device object.

[in] PowerCapabilities

A pointer to a driver-allocated WDF_DEVICE_POWER_CAPABILITIES structure.

Return value

None

Remarks

A bug check occurs if the driver supplies an invalid object handle.

A driver typically calls WdfDeviceSetPowerCapabilities from within one of the following callback functions:

EvtDriverDeviceAdd
EvtDevicePrepareHardware
EvtDeviceD0Entry (if the PreviousState parameter's value is WdfPowerDeviceD3Final)
EvtDeviceSelfManagedIoInit
EvtChildListCreateDevice

If more than one driver in the device's driver stack call WdfDeviceSetPowerCapabilities, the power manager uses the values that are supplied by the driver that is highest in the stack.

Examples

The following code example initializes a WDF_DEVICE_POWER_CAPABILITIES structure and then calls WdfDeviceSetPowerCapabilities.

WDF_DEVICE_POWER_CAPABILITIES powerCaps;

WDF_DEVICE_POWER_CAPABILITIES_INIT(&powerCaps);
powerCaps.DeviceD1 = WdfTrue;
powerCaps.WakeFromD1 = WdfTrue;
powerCaps.DeviceWake = PowerDeviceD1;
powerCaps.DeviceState[PowerSystemWorking] = PowerDeviceD1;
powerCaps.DeviceState[PowerSystemSleeping1] = PowerDeviceD1;
powerCaps.DeviceState[PowerSystemSleeping2] = PowerDeviceD2;
powerCaps.DeviceState[PowerSystemSleeping3] = PowerDeviceD2;
powerCaps.DeviceState[PowerSystemHibernate] = PowerDeviceD3;
powerCaps.DeviceState[PowerSystemShutdown] = PowerDeviceD3;

WdfDeviceSetPowerCapabilities(
                              device,
                              &powerCaps
                              );

Requirements

Requirement	Value
Target Platform	Universal
Minimum KMDF version	1.0
Minimum UMDF version	2.0
Header	wdfdevice.h (include Wdf.h)
Library	Wdf01000.sys (KMDF); WUDFx02000.dll (UMDF)
IRQL	<=DISPATCH_LEVEL
DDI compliance rules	DriverCreate(kmdf), KmdfIrql(kmdf), KmdfIrql2(kmdf), KmdfIrqlExplicit(kmdf)

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