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Date:      Mon, 6 Dec 2004 11:41:21 +1030
From:      "Daniel O'Connor" <doconnor@gsoft.com.au>
To:        freebsd-stable@freebsd.org
Cc:        Hannes Mayer <h.mayer@inode.at>
Subject:   Re: Parallel Port Interrupt Handler in Kernel Module
Message-ID:  <200412061141.21490.doconnor@gsoft.com.au>
In-Reply-To: <41B32A1F.9000205@inode.at>
References:  <41B32A1F.9000205@inode.at>

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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 exam=
ple=20
code 8-)

In FreeBSD there is a parallel port abstraction called ppbus (man 4 ppbus)=
=20
which allows different drivers to access the parallel port. Examples of cod=
e=20
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=20
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=
=20
allows you to load and unload (although I haven't actually _tested_ it apar=
t=20
from load and unload :)

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

=2D-=20
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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