freebsd stable - Dec 2004 - Parallel Port Interrupt Handler in Kernel Module

Hi all!

I'm new to FreeBSD - installed it 3 days ago :-)

I'm trying to capture the parallel port interrupt in a kernel module.
First I compiled the "skeleton" from:
http://freebsd.active-venture.com/arch-handbook/driverbasics-kld.html
and it works well.

Then I googled on how to setup the interrupt handler, also looked at
the device driver sources of the parallel port driver and I found
that BUS_SETUP_INTR is used to setup the handler.

But now after 5 hours and more googling I'm still clueless on how to
implement BUS_SETUP_INTR in the "skeleton".

Is anyone willing to share an example of a kernel module with basic
interrupt handling ?

In linux it was pretty easy (even with RTAI in hard real time)
(see: http://www.captain.at/programming/rtai/parportint.php )
but here I'm lost.

Thanks a lot in advance & best regards,
Hannes.

On Mon, 6 Dec 2004 02:02, Hannes Mayer wrote:
> I'm trying to capture the parallel port interrupt in a kernel module.
> First I compiled the "skeleton" from:
> http://freebsd.active-venture.com/arch-handbook/driverbasics-kld.html
> and it works well.
>
> Then I googled on how to setup the interrupt handler, also looked at
> the device driver sources of the parallel port driver and I found
> that BUS_SETUP_INTR is used to setup the handler.
I would suggest looking at existing drivers, there's plenty of working
example
code 8-)

In FreeBSD there is a parallel port abstraction called ppbus (man 4 ppbus) 
which allows different drivers to access the parallel port. Examples of code 
that uses ppbus are lpt, vpo, ppi, pps.

I would say the ppi driver is probably a good place to start looking as it's
just a "geek port", and hence isn't very complex.

I just kludged up a version of ppi that you can build outside the tree and 
allows you to load and unload (although I haven't actually _tested_ it apart
from load and unload :)

http://www.gsoft.com.au/~doconnor/pphack.tgz

-- 
Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
  -- Andrew Tanenbaum
GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C

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