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EvtDeviceD0EntryPostInterruptsEnabled function

[Applies to KMDF and UMDF]

A driver's EvtDeviceD0EntryPostInterruptsEnabled event callback function performs device-specific operations that are required after the driver has enabled the device's hardware interrupts.

Syntax


EVT_WDF_DEVICE_D0_ENTRY_POST_INTERRUPTS_ENABLED EvtDeviceD0EntryPostInterruptsEnabled;

NTSTATUS EvtDeviceD0EntryPostInterruptsEnabled(
  _In_  WDFDEVICE Device,
  _In_  WDF_POWER_DEVICE_STATE PreviousState
)
{ ... }

Parameters

Device [in]

A handle to a framework device object.

PreviousState [in]

A WDF_POWER_DEVICE_STATE-typed enumerator that identifies the previous device power state.

Return value

If the EvtDeviceD0EntryPostInterruptsEnabled callback function encounters no errors, it must return STATUS_SUCCESS or another status value for which NT_SUCCESS(status) equals TRUE. Otherwise, it must return a status value for which NT_SUCCESS(status) equals FALSE.

For more information about this callback function's return values, see Reporting Device Failures.

Remarks

To register an EvtDeviceD0EntryPostInterruptsEnabled callback function, a driver must call WdfDeviceInitSetPnpPowerEventCallbacks.

The EvtDeviceD0EntryPostInterruptsEnabled callback function is called at IRQL = PASSIVE_LEVEL, after the driver's EvtInterruptEnable callback function returns. A driver can provide this function if it must perform device-specific operations after it has enabled an interrupt, if those operations should not be performed at IRQL = DIRQL in the EvtInterruptEnable callback function. You should not make this callback function pageable.

For more information about when the framework calls this callback function, see PnP and Power Management Scenarios.

For more information about handling interrupts, see Handling Hardware Interrupts.

Examples

To define an EvtDeviceD0EntryPostInterruptsEnabled callback function, you must first provide a function declaration that identifies the type of callback function you’re defining. Windows provides a set of callback function types for drivers. Declaring a function using the callback function types helps Code Analysis for Drivers, Static Driver Verifier (SDV), and other verification tools find errors, and it’s a requirement for writing drivers for the Windows operating system.

For example, to define an EvtDeviceD0EntryPostInterruptsEnabled callback function that is named MyDeviceD0EntryPostInterruptsEnabled, use the EVT_WDF_DEVICE_D0_ENTRY_POST_INTERRUPTS_ENABLED type as shown in this code example:


EVT_WDF_DEVICE_D0_ENTRY_POST_INTERRUPTS_ENABLED  MyDeviceD0EntryPostInterruptsEnabled;

Then, implement your callback function as follows:


_Use_decl_annotations_
NTSTATUS
 MyDeviceD0EntryPostInterruptsEnabled(
    WDFDEVICE  Device,
    WDF_POWER_DEVICE_STATE  PreviousState
    )
  {...}

The EVT_WDF_DEVICE_D0_ENTRY_POST_INTERRUPTS_ENABLED function type is defined in the Wdfdevice.h header file. To more accurately identify errors when you run the code analysis tools, be sure to add the _Use_decl_annotations_ annotation to your function definition. The _Use_decl_annotations_ annotation ensures that the annotations that are applied to the EVT_WDF_DEVICE_D0_ENTRY_POST_INTERRUPTS_ENABLED function type in the header file are used. For more information about the requirements for function declarations, see Declaring Functions by Using Function Role Types for KMDF Drivers. For information about _Use_decl_annotations_, see Annotating Function Behavior.

Requirements

Minimum KMDF version

1.0

Minimum UMDF version

2.0

Header

Wdfdevice.h (include Wdf.h)

IRQL

PASSIVE_LEVEL (see Remarks section)

See also

EvtDeviceD0ExitPreInterruptsDisabled

 

 

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