[lug] Newbie Question about Virtual Device Driver

[Jeffrey S. Haemer]

Scott,

Would this<http://www.piware.de/2013/02/umockdev-record-and-mock-hardware-for-debugging-and-testing/>
be
any help for your problem?


On Sat, Feb 9, 2013 at 2:54 PM, Davide Del Vento <davide.del.vento at gmail.com
> wrote:

> Scott,
> My very first paid job in software (many years ago) was about
> something similar to your project, but for a real hw.
> Since we did not expected to have the hw in the lab for a long time
> whereas we wanted to do the development of the software, we decided
> the following approach which turned out to be a very good idea for the
> rest of the project. The actual UI was talking to a server using a
> simple protocol of our design, on top of TCP/IP. The server initially
> was completely fake like your "driver" would. Then we've got some
> files representing some possible real data coming from the hw and we
> allowed in the server the option to replay those file. At that point
> the server started to became smarter and we used it as simulator of
> the hw, making it possible to run some serious tests. Eventually we've
> got the real hw and therefore somebody made the actual driver for it
> and we used it.
> As I said, this choice has been very beneficial for us. In fact, I did
> all my development work on Linux, whereas in the end they decided to
> hook the hw to a windows-only box (I wasn't involved in the driver for
> it). Porting the code of the UI to windows has been straightforward,
> but I'm sure the "driver" (fake or real) would not. For some time we
> kept the two pieces of software on two different boxes which also was
> convenient (this wasn't an instrument you wanted to play with your
> hands - actually I've never seen it myself :-)
> Of course this approach might or might not work for you, but I believe
> it's good that you think of this option.
> Cheers,
> Davide
>
> On Sat, Feb 9, 2013 at 10:25 AM, Jonathan Corbet <corbet-bldrlug at lwn.net>
> wrote:
> > On Sat, 9 Feb 2013 10:17:35 -0700
> > Scott Jackson <scott.jackson.swe at gmail.com> wrote:
> >
> >> So what I need the Simulator to do is to
> >> create the fake devices so that UDEV can find them and open a
> >> communication line to them.  I envision the Simulated devices being
> >> simple Socket Servers that respond to the incoming requests from the
> >> managing software.
> >
> > The easiest approach might be to look at the UIO subsystem.  There's an
> > oldish overview here:
> >
> >         https://lwn.net/Articles/232575/
> >
> > you'll find more current information in uio-howto in the kernel
> > documentation directory.  UIO let's you put a little shim into the kernel
> > and farm the real work out to user space, so your simulated driver can
> run
> > in a relatively easy and safe environment.
> >
> > jon
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-- 
Jeffrey Haemer <jeffrey.haemer at gmail.com>
720-837-8908 [cell], http://seejeffrun.blogspot.com [blog],
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*פרייהייט? דאס איז יאַנג דינען וואָרט.*
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