Passmark USB loopback test plugs

Peter Teoh htmldeveloper at
Sat Nov 10 00:05:08 UTC 2007

Thank you for your reply.

On Nov 10, 2007 7:22 AM, Greg KH <greg at> wrote:
> On Sun, Nov 04, 2007 at 11:30:17PM +0800, Peter Teoh wrote:
> > At the drivers needed list:
> >
> >
> >
> > I saw one named as Passmark USB loopback test plugs.   Looks interesting for me.
> >
> > So my question is:
> >
> > a.   Anyone working on this yet?
> > b.   Currently at the Passmark site, are listed all the windows
> > drivers.    I thought of  just converting all those from windows to
> > Linux - from those who have experienced before, any comments?
> > (difficulties to be encountered, conformance to Linux kernel design
> > etc).
> Do you have access to the specs for these devices?  You are going to
> need them in order for you, or anyone else, to be able to write a Linux
> driver for the devices.
> Also, you might not need a kernel driver for these devices, we already
> have a usb-test kernel module that achives much of this already for
> Linux and is very good for testing.
> thanks,
> greg k-h

I have been correspond with the Passmark guy, and he seemed pretty
much interested, as the linux part is what they are lacking, and they
would like to get the loopback function out first, followed by other
functionality later.

The specs, as he mentioned, is just the Cypress 68013A chip (which is
recognized by the usbtest.c as one of the PID/VID), so I have been
trying to understand usbtest.c to see how it can be modified to test
the loopback functionality.

I don't have that hardware, but a close relative one - which is OSR
FX2, (which is based on the same chip, but the PID/VID is different).
 I am still learning the ropes of writing the driver, any technical
problem I will come back to this list or to Passmark.   Thanks!!!

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