EVT_UCX_USBDEVICE_DEFAULT_ENDPOINT_ADD callback function (ucxusbdevice.h)

Article
02/22/2024

The client driver's implementation that UCX calls to add a new default endpoint for a USB device.

Syntax

EVT_UCX_USBDEVICE_DEFAULT_ENDPOINT_ADD EvtUcxUsbdeviceDefaultEndpointAdd;

NTSTATUS EvtUcxUsbdeviceDefaultEndpointAdd(
  [in] UCXCONTROLLER UcxController,
  [in] UCXUSBDEVICE UcxUsbDevice,
  [in] ULONG MaxPacketSize,
  [in] PUCXENDPOINT_INIT UcxEndpointInit
)
{...}

Parameters

[in] UcxController

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

[in] UcxUsbDevice

A handle to a UCX object that represents the USB device.

[in] MaxPacketSize

Maximum packet size for transfers on this endpoint.

[in] UcxEndpointInit

A pointer to an opaque structure containing initialization information. Callbacks for the endpoint object are associated with this structure. This structure is managed by UCX.

Return value

If the operation is successful, the callback function 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.

Remarks

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

The callback function calls UcxEndpointCreate to create a new default endpoint object and register its default endpoint object callback functions.

Then, the callback function typically creates a WDF queue associated with the endpoint object. The queue does not receive any requests until the class extension starts it.

Examples

NTSTATUS
Endpoint_EvtUcxUsbDeviceDefaultEndpointAdd(
    UCXCONTROLLER           UcxController,
    UCXUSBDEVICE            UcxUsbDevice,
    ULONG                   MaxPacketSize,
    PUCXENDPOINT_INIT       EndpointInit
)

{
    NTSTATUS                                status = STATUS_SUCCESS;

    UCX_DEFAULT_ENDPOINT_EVENT_CALLBACKS    ucxDefaultEndpointEventCallbacks;
    WDF_OBJECT_ATTRIBUTES                   objectAttributes;

    PUCX_CONTROLLER_CONTEXT                 ucxControllerContext;

    UCXENDPOINT                             ucxEndpoint;
    PUCX_ENDPOINT_CONTEXT                   ucxEndpointContext;


    WDF_IO_QUEUE_CONFIG                     queueConfig;
    WDFQUEUE                                wdfQueue;


    UCX_DEFAULT_ENDPOINT_EVENT_CALLBACKS_INIT(&ucxDefaultEndpointEventCallbacks,
                                              Endpoint_EvtUcxEndpointPurge,
                                              Endpoint_EvtUcxEndpointStart,
                                              Endpoint_EvtUcxEndpointAbort,
                                              Endpoint_EvtUcxEndpointOkToCancelTransfers,
                                              Endpoint_EvtUcxDefaultEndpointUpdate);

    UcxDefaultEndpointInitSetEventCallbacks(EndpointInit, &ucxDefaultEndpointEventCallbacks);

    WDF_OBJECT_ATTRIBUTES_INIT_CONTEXT_TYPE(&objectAttributes, UCX_ENDPOINT_CONTEXT);

    ucxControllerContext = GetUcxControllerContext(UcxController);

    status = UcxEndpointCreate(UcxUsbDevice,
        &EndpointInit,
        &objectAttributes,
        &ucxEndpoint);

    if (!NT_SUCCESS(status)) {
        DbgTrace(TL_ERROR, Endpoint, "UcxEndpoint Failed %!STATUS!", status);
        goto EvtUsbDeviceDefaultEndpointAddEnd;
    }

    DbgTrace(TL_INFO, Endpoint, "UcxEndpoint created");

    ucxEndpointContext = GetUcxEndpointContext(ucxEndpoint);

    ucxEndpointContext->IsDefault = TRUE;
    ucxEndpointContext->MaxPacketSize = MaxPacketSize;

    WDF_IO_QUEUE_CONFIG_INIT(&queueConfig, WdfIoQueueDispatchManual);

    status = WdfIoQueueCreate(ucxControllerContext->WdfDevice,
        &queueConfig,
        WDF_NO_OBJECT_ATTRIBUTES,
        &wdfQueue);

    if (!NT_SUCCESS(status)) {
        DbgTrace(TL_ERROR, Endpoint, "WdfIoQueueCreate Failed %!STATUS!", status);
        goto EvtUsbDeviceDefaultEndpointAddEnd;
    }

    UcxEndpointSetWdfIoQueue(ucxEndpoint, wdfQueue);

EvtUsbDeviceDefaultEndpointAddEnd:

    return status;
}

Requirements

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

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