[wdmaudiodev] Re: Port Class Mini-ports
- From: "Jeff Pages" <jeff@xxxxxxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Fri, 9 May 2003 09:12:03 +1000
That's very handy to know. I'm curious if it's actually documented anywhere,
or if it might change in future versions.
Jeff
> You can get it from the FDO's device extension. The PhysicalDeviceObject
> is the third PVOID value in the structure.
>
> typedef struct
> {
> // PortClass device extension
> PVOID Reserved1[2];
> PDEVICE_OBJECT PhysicalDeviceObject;
> PVOID Reserved2[1];
> PVOID Available[4];
> PVOID Reserved3[(PORT_CLASS_DEVICE_EXTENSION_SIZE/sizeof(PVOID)) - 8];
>
> // Vendor specific device extension.
> ....
> } DEVICE_EXTENSION;
>
>
> -HockYiung
>
> wdmaudiodev-bounce@xxxxxxxxxxxxx wrote on 05/08/2003 03:18:22 PM:
>
> > I've tried extracting the DeviceObject from the "next" stack location
> of
> > theStart Device IRP - and it seems to be the correct Pdo.
> >
> > Would this be an appropriate thing to do or is there a better
> alternative?
> >
> > Thanks.
> > Devendra.
> >
> > At 02:52 PM 5/8/2003, BlazeAudio Developer wrote:
> >
> > Olivier,
> >
> > Thank you for the valuable information.
> >
> > I have another question - how does your driver "extract" the Pdo back
> from
> > PortClass.
> >
> > The AddDevice routine gets called with the Pdo.
> >
> > But, StartDevice gets called with an Fdo (an IRP and a Resource List).
> >
> > How can StartDevice get hold of the Pdo?
> >
> > Thanks.
> > Devendra.
> >
> > At 02:17 AM 4/22/2003, Olivier Roblin wrote:
> >
> >
> > You can set your own manager functions in DriverEntry :
> > DriverObject->MajorFunction[IRP_MJ_CREATE] = YourOwn;
> > DriverObject->MajorFunction[IRP_MJ_DEVICE_CONTROL]] = YourOwn;
> > etc...
> > I did it a few times..
> >
> > Olivier
> >
> >
> >
> > ----- Original Message -----
> > From: <bart@xxxxxxxxxxxxx>
> > To: <wdmaudiodev@xxxxxxxxxxxxx>
> > Sent: Tuesday, April 22, 2003 11:09 AM
> > Subject: [wdmaudiodev] Re: Port Class Mini-ports
> >
> >
> > >
> > >
> > >>Actually, nothing prevents you from using Port Class with USB, Fire
> > Wire,
> > >>etc...You get audio data from the OS with the PCI MiniPort, and you
> can
> > then
> > >>send them on the USB for example. But the Port Class doesn't provide
> any
> > >>service to do that!
> > >>
> > >The largest problem I found is to handle the PNP IRP's as they are not
> > >passed by PortCls to the miniport (whithout some indecent hacking
> anyway).
> > >The same goes for DeviceIOCTL's.
> > >
> > >Regards,
> > >Bart
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