[wdmaudiodev] Re: Port Class Mini-ports
- From: BlazeAudio Developer <developer@xxxxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Thu, 08 May 2003 15:18:22 -0700
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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