EVT_UCX_USBDEVICE_ENABLE callback function (ucxusbdevice.h)

Artikel
10/21/2021

The client driver's implementation that UCX calls to program information about the device and its default control endpoint into the controller.

Syntax

EVT_UCX_USBDEVICE_ENABLE EvtUcxUsbdeviceEnable;

void EvtUcxUsbdeviceEnable(
  [in] UCXCONTROLLER UcxController,
  [in] WDFREQUEST Request
)
{...}

Parameters

[in] UcxController

A handle to the UCX controller that the client driver received in a previous call to the UcxControllerCreate method.

[in] Request

A structure of type USBDEVICE_ENABLE.

Return value

None

Remarks

The UCX client driver registers this callback function with the USB host controller extension (UCX) by calling the UcxUsbDeviceCreate method.

To transition the device to the desired state, the host controller driver communicates with the hardware to complete the request.

In this callback function, the client driver prepares the controller to accept and schedule transfers on the default control endpoint for the USB device.

When the driver has finished, it completes the WDFREQUEST.

The client driver returns completion status in Request. The driver can complete the WDFREQUEST asynchronously.

Examples

VOID
UsbDevice_EvtUcxUsbDeviceEnable(
    UCXCONTROLLER      UcxController,
    WDFREQUEST         Request
)
    
{
    UNREFERENCED_PARAMETER(UcxController);

    DbgTrace(TL_INFO, UsbDevice, "UsbDevice_EvtUcxUsbDeviceEnable");

    WDF_REQUEST_PARAMETERS_INIT(&wdfRequestParams);
    WdfRequestGetParameters(WdfRequest, &wdfRequestParams);
    usbDeviceEnable = (PUSBDEVICE_ENABLE)wdfRequestParams.Parameters.Others.Arg1;
    ...

    WdfRequestComplete(Request, STATUS_SUCCESS);
}

Requirements

Requirement	Value
Target Platform	Windows
Minimum KMDF version	1.0
Minimum UMDF version	2.0
Header	ucxusbdevice.h (include Ucxclass.h)
IRQL	DISPATCH_LEVEL

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