最終更新:2014-12-18 (木) 14:07:26 (3415d)  

Featureレポート
Top / Featureレポート

A feature report specifies configuration information for a device.

Data blobs that can be manually read and/or written, and are typically related to configuration information.

デバイスのコンフィギュレーション情報を指定するレポート。常にエンドポイント0を使用する。

概要

  • Feature reports are used for specific static device features and never reported spontaneously.
  • A host can read and/or write them to access data like battery-state or device-settings.
  • Feature reports are never sent without requests. A host must explicitly set or retrieve a feature report.
  • This also means, feature reports are never sent on the intr channel as this channel is asynchronous.
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USB/クラスリクエスト

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GET_REPORT

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SET_REPORT

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hid.dllの関数

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Elotouch Driver

  • IOCTL_HID_GET_FEATURE 
    NTSTATUS INTERNAL
NInputGetFeatureReport(
    __in WDFDEVICE Device,
    __in WDFREQUEST Request
    )
/*++

Routine Description:

   Gets feature report

Arguments:

   Device - WDF device

   Request - WDF request

Return Value:
  SUCCESS - Returns STATUS_SUCCESS.
  FAILURE - Returns NT status code.

--*/
{
    NTSTATUS                 status = STATUS_SUCCESS;
    PHID_XFER_PACKET         FeaturePacket  = NULL;
    PDEVICE_EXTENSION        deviceInfo = NULL;
    WDF_REQUEST_PARAMETERS   params = {0};


    UNREFERENCED_PARAMETER(Device);

    WDF_REQUEST_PARAMETERS_INIT(&params);
    WdfRequestGetParameters(Request, &params);

    KdPrint(("Retrieving config mode\n"));
    deviceInfo = GetDeviceContext(WdfIoQueueGetDevice(WdfRequestGetIoQueue(Request)));

    //
    // IOCTL_HID_SET_FEATURE & IOCTL_HID_GET_FEATURE are not METHOD_NIEHTER
    // IOCTLs. So you cannot retreive UserBuffer from the IRP using Wdf
    // function. As a result we have to escape out to WDM to get the UserBuffer
    // directly from the IRP. 
    //

    if (params.Parameters.DeviceIoControl.OutputBufferLength < sizeof(HID_XFER_PACKET)) {
        status = STATUS_BUFFER_TOO_SMALL;
        KdPrint(("Output Buffer:%d is too smalll!\n", params.Parameters.DeviceIoControl.OutputBufferLength));

    }
    else {

        FeaturePacket = (PHID_XFER_PACKET) WdfRequestWdmGetIrp(Request)->UserBuffer;
        if (FeaturePacket == NULL) {
            status = STATUS_INVALID_DEVICE_REQUEST;
            KdPrint(("FeaturePacket == NULL!\n"));            
        }
        else
        {        
            UCHAR ReportId = *(PUCHAR)FeaturePacket->reportBuffer;
            if(REPORTID_FEATURE == ReportId &&
                FeaturePacket->reportBufferLen >= sizeof(HID_FEATURE_REPORT))
            {  
               PHID_FEATURE_REPORT InputModeReport = (PHID_FEATURE_REPORT)FeaturePacket->reportBuffer; 
               InputModeReport->InputMode = deviceInfo->InputMode;

            }
            else if(REPORTID_MAX_COUNT == ReportId && 
                FeaturePacket->reportBufferLen >= sizeof(HID_MAX_COUNT_REPORT))
            {                
               PHID_MAX_COUNT_REPORT MaxCountReport = (PHID_MAX_COUNT_REPORT)FeaturePacket->reportBuffer;
               MaxCountReport->MaxCount = ELO_MT_MAX_COUNT;
            }
            else
            {
                status = STATUS_INVALID_PARAMETER;
                KdPrint(("Wrong feature report id or length expected ids: Feauture:%d,  MaxCount:%d actual:%d  expected length: Feature:%d, or MaxCount:%d actual:%d!\n", 
                    REPORTID_FEATURE, REPORTID_MAX_COUNT, ReportId, sizeof(HID_FEATURE_REPORT), sizeof(HID_MAX_COUNT_REPORT), FeaturePacket->reportBufferLen));
            }
        } 

    }   
    TExit(Func, ("=%x", status));
    return status;
}
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メモ

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