Using SCSI_PASS_THROUGH with a lower device

From within a device driver I need to pass an asynmchronous SCSI reques
down to a "lower device". In the past, I have always passed the reques
to the lower driver using the ASPI miniport driver.

This doesn't work with USB based devices, so I am trying to use th
SCSI_PASS_THROUGH mechanism. I can manage to build up th
SCSI_PASS_THROUGH_BUFFER with no problem. The problem I have is fillin
in a few fields of the IRP.

First question is, can the SCSI_PASS_THROUGH mechanism be used fo
asynchronous I/O?

The second question is how to fill in the request packet. I need th
equivalent of:

I.MajorFunction(NEXT) = IRP_MJ_SCSI;
I.NextStackLocation()->Parameters.Scsi.Srb = srb;

Many thanks if anyone can help

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