WdfDeviceSetPowerCapabilities function

Description

[Applies to KMDF and UMDF]

The WdfDeviceSetPowerCapabilities method reports a device's power capabilities.

Parameters

Device [in]

A handle to a framework device object.

PowerCapabilities [in]

A pointer to a driver-allocated WDF_DEVICE_POWER_CAPABILITIES structure.

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
                              );

See also

WDF_DEVICE_POWER_CAPABILITIES

WDF_DEVICE_POWER_CAPABILITIES_INIT

WdfDeviceSetPnpCapabilities