EVT_UCX_USBDEVICE_ENDPOINT_ADD callback function (ucxusbdevice.h)

Article
02/22/2024

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

Syntax

EVT_UCX_USBDEVICE_ENDPOINT_ADD EvtUcxUsbdeviceEndpointAdd;

NTSTATUS EvtUcxUsbdeviceEndpointAdd(
  [in]           UCXCONTROLLER UcxController,
  [in]           UCXUSBDEVICE UcxUsbDevice,
  [in]           PUSB_ENDPOINT_DESCRIPTOR UsbEndpointDescriptor,
  [in]           ULONG UsbEndpointDescriptorBufferLength,
  [in, optional] PUSB_SUPERSPEED_ENDPOINT_COMPANION_DESCRIPTOR SuperSpeedEndpointCompanionDescriptor,
  [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] UsbEndpointDescriptor

A pointer to a location containing a USB descriptor for the endpoint being created.

[in] UsbEndpointDescriptorBufferLength

Length in bytes of the descriptor.

[in, optional] SuperSpeedEndpointCompanionDescriptor

An additional descriptor for a super speed port. This parameter is optional and may be NULL.

[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 endpoint object and register 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_EvtUcxUsbDeviceEndpointAdd(
    UCXCONTROLLER                                   UcxController,
    UCXUSBDEVICE                                    UcxUsbDevice,
    PUSB_ENDPOINT_DESCRIPTOR                        UsbEndpointDescriptor,
    ULONG                                           UsbEndpointDescriptorBufferLength,
    PUSB_SUPERSPEED_ENDPOINT_COMPANION_DESCRIPTOR   SuperSpeedEndpointCompanionDescriptor,
    PUCXENDPOINT_INIT                               UcxEndpointInit
)

{
    NTSTATUS                        status = STATUS_SUCCESS;

    UCX_ENDPOINT_EVENT_CALLBACKS    ucxEndpointEventCallbacks;
    WDF_OBJECT_ATTRIBUTES           objectAttributes;

    PUCX_CONTROLLER_CONTEXT         ucxControllerContext;

    UCXENDPOINT                     ucxEndpoint;
    PUCX_ENDPOINT_CONTEXT           ucxEndpointContext;

    WDF_IO_QUEUE_CONFIG             queueConfig;

    UNREFERENCED_PARAMETER(UsbEndpointDescriptor);
    UNREFERENCED_PARAMETER(UsbEndpointDescriptorBufferLength);
    UNREFERENCED_PARAMETER(SuperSpeedEndpointCompanionDescriptor);

    UCX_ENDPOINT_EVENT_CALLBACKS_INIT(&ucxEndpointEventCallbacks,
                                      Endpoint_EvtUcxEndpointPurge,
                                      Endpoint_EvtUcxEndpointStart,
                                      Endpoint_EvtUcxEndpointAbort,
                                      Endpoint_EvtUcxEndpointReset,
                                      Endpoint_EvtUcxEndpointOkToCancelTransfers,
                                      Endpoint_EvtUcxEndpointStaticStreamsAdd,
                                      Endpoint_EvtUcxEndpointStaticStreamsEnable,
                                      Endpoint_EvtUcxEndpointStaticStreamsDisable,
                                      Endpoint_EvtUcxEndpointEnableForwardProgress);

    UcxEndpointInitSetEventCallbacks(UcxEndpointInit, &ucxEndpointEventCallbacks);

    WDF_OBJECT_ATTRIBUTES_INIT_CONTEXT_TYPE(&objectAttributes, UCX_ENDPOINT_CONTEXT);

    ucxControllerContext = GetUcxControllerContext(UcxController);

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

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

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

    ucxEndpointContext = GetUcxEndpointContext(ucxEndpoint);

    ucxEndpointContext->IsDefault = FALSE;
    ucxEndpointContext->MaxPacketSize = MAX_PACKET_SIZE;

    WDF_IO_QUEUE_CONFIG_INIT(&queueConfig, WdfIoQueueDispatchManual);

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

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

    UcxEndpointSetWdfIoQueue(ucxEndpoint, ucxEndpointContext->IoQueue);

EvtUsbDeviceEndpointAddEnd:

    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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