About IOCTL_HID_GET_FEATURE
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From: Angela Yan on 28 Aug 2005 11:06 Hi, I need to create an Asyn IRP for IOCTL_HID_GET_FEATURE. But I can't find any sample in DDK or WDM book for it. Here are the partial codes: irp = IoAllocateIrp(DeviceExtension->TopOfStackDriver->StackSize + 1, FALSE); if(irp == NULL) { ExFreePool(report); return STATUS_INSUFFICIENT_RESOURCES; } IoReuseIrp(irp, STATUS_SUCCESS); irpSp = IoGetNextIrpStackLocation(irp); irpSp->MajorFunction = IRP_MJ_DEVICE_CONTROL; irpSp->Parameters.DeviceIoControl.IoControlCode = IOCTL_HID_GET_FEATURE; irpSp->Parameters.DeviceIoControl.OutputBufferLength = DeviceExtension->FeatureReportLength; irpSp->FileObject = fileObject; I want to know how should I allocate the feature report buffer to the Irp->MdlAddress? By using IoAllocateMdl()? When I get back the completed Irp, do I just directly access the MdlAddress field to get the feature report buffer, or any Io routine is needed? And if I were to reuse to Irp to get the feature report, is there any special handling that I need to do for the MdlAddress? Thanks in advance. Angela
From: Doron Holan [MS] on 28 Aug 2005 13:02 you can allocate the MDL with IoAllocateMdl and then if the buffer is a part of your device extension, use MmBuildMdlFromNonPagedPool. If you go this route, you should see use MmReuseMdl before reinitializng the MDL. the bulkusb sample (which is a bit confusing for this, sorry) shows how to to reuse a MDL. d -- Please do not send e-mail directly to this alias. this alias is for newsgroup purposes only. This posting is provided "AS IS" with no warranties, and confers no rights. "Angela Yan" <yanyan9(a)hotmail.com> wrote in message news:OFopLI%23qFHA.2072(a)TK2MSFTNGP14.phx.gbl... > Hi, > > I need to create an Asyn IRP for IOCTL_HID_GET_FEATURE. But I can't find > any sample in DDK or WDM book for it. Here are the partial codes: > > > irp = IoAllocateIrp(DeviceExtension->TopOfStackDriver->StackSize + 1, > FALSE); > > if(irp == NULL) > { > ExFreePool(report); > return STATUS_INSUFFICIENT_RESOURCES; > } > > IoReuseIrp(irp, STATUS_SUCCESS); > > irpSp = IoGetNextIrpStackLocation(irp); > > irpSp->MajorFunction = IRP_MJ_DEVICE_CONTROL; > irpSp->Parameters.DeviceIoControl.IoControlCode = IOCTL_HID_GET_FEATURE; > irpSp->Parameters.DeviceIoControl.OutputBufferLength = > DeviceExtension->FeatureReportLength; > irpSp->FileObject = fileObject; > > > I want to know how should I allocate the feature report buffer to the > Irp->MdlAddress? > By using IoAllocateMdl()? > > > When I get back the completed Irp, do I just directly access the > MdlAddress field to > get the feature report buffer, or any Io routine is needed? > > > And if I were to reuse to Irp to get the feature report, is there any > special handling that I > need to do for the MdlAddress? > > > Thanks in advance. > > Angela >
From: Angela Yan on 29 Aug 2005 07:24 Thank you Doron... :) Angela "Doron Holan [MS]" <doronh(a)nospam.microsoft.com> wrote in message news:uXIgAJ$qFHA.2592(a)TK2MSFTNGP09.phx.gbl... > you can allocate the MDL with IoAllocateMdl and then if the buffer is a > part of your device extension, use MmBuildMdlFromNonPagedPool. If you go > this route, you should see use MmReuseMdl before reinitializng the MDL. > the bulkusb sample (which is a bit confusing for this, sorry) shows how to > to reuse a MDL. > > d > > -- > Please do not send e-mail directly to this alias. this alias is for > newsgroup purposes only. > This posting is provided "AS IS" with no warranties, and confers no > rights. > > > "Angela Yan" <yanyan9(a)hotmail.com> wrote in message > news:OFopLI%23qFHA.2072(a)TK2MSFTNGP14.phx.gbl... >> Hi, >> >> I need to create an Asyn IRP for IOCTL_HID_GET_FEATURE. But I can't find >> any sample in DDK or WDM book for it. Here are the partial codes: >> >> >> irp = IoAllocateIrp(DeviceExtension->TopOfStackDriver->StackSize + 1, >> FALSE); >> >> if(irp == NULL) >> { >> ExFreePool(report); >> return STATUS_INSUFFICIENT_RESOURCES; >> } >> >> IoReuseIrp(irp, STATUS_SUCCESS); >> >> irpSp = IoGetNextIrpStackLocation(irp); >> >> irpSp->MajorFunction = IRP_MJ_DEVICE_CONTROL; >> irpSp->Parameters.DeviceIoControl.IoControlCode = IOCTL_HID_GET_FEATURE; >> irpSp->Parameters.DeviceIoControl.OutputBufferLength = >> DeviceExtension->FeatureReportLength; >> irpSp->FileObject = fileObject; >> >> >> I want to know how should I allocate the feature report buffer to the >> Irp->MdlAddress? >> By using IoAllocateMdl()? >> >> >> When I get back the completed Irp, do I just directly access the >> MdlAddress field to >> get the feature report buffer, or any Io routine is needed? >> >> >> And if I were to reuse to Irp to get the feature report, is there any >> special handling that I >> need to do for the MdlAddress? >> >> >> Thanks in advance. >> >> Angela >> > >
From: Maxim S. Shatskih on 29 Aug 2005 07:54 > I want to know how should I allocate the feature report buffer to the > Irp->MdlAddress? > By using IoAllocateMdl()? No, use Irp->AssociatedIrp.SystemBuffer instead. -- Maxim Shatskih, Windows DDK MVP StorageCraft Corporation maxim(a)storagecraft.com http://www.storagecraft.com
From: Angela Yan on 29 Aug 2005 11:52
Hi, The DDK says "IOCTL_HID_GET_FEATURE Output The Irp->MdlAddress member points to the requester-allocated output buffer that the HID class driver uses to return the feature report." So I presume if a upper device filter, such as firefly, were to send IOCTL_HID_GET_FEATURE to Hid miniDriver via HidClass, it should allocate the Irp->MdlAddress to the output feature report buffer. Am I correct? Thank you. Angela "Maxim S. Shatskih" <maxim(a)storagecraft.com> wrote in message news:ujljqAJrFHA.908(a)tk2msftngp13.phx.gbl... >> I want to know how should I allocate the feature report buffer to the >> Irp->MdlAddress? >> By using IoAllocateMdl()? > > No, use Irp->AssociatedIrp.SystemBuffer instead. > > -- > Maxim Shatskih, Windows DDK MVP > StorageCraft Corporation > maxim(a)storagecraft.com > http://www.storagecraft.com > > |