Alan,

That was a problem!  The lp driver was already loaded.  If I remove it and
then load my driver, it returns with success from parport_register_device.
Thanks for your help!

Regards,
Kathy

-----Original Message-----
From: Alan Cox [mailto:alan@lxorguk.ukuu.org.uk] 
Sent: Friday, April 25, 2008 1:12 PM
To: Kathy Frazier
Cc: 'Kathy Frazier'; linux-kernel@vger.kernel.org
Subject: Re: Talking to parallel port in 2.6 kernel without using parport

quoted text
> One of our engineers downloaded source code a while back from 
> linux-2.6.18-rc7, but I am not sure how close that is to what is 
> installed on my system (uname -r returns 2.6.18-1.2798.fc6.  When I 
> set my printk to 8 (echo 8 > /proc/sys/kernel/printk), there are no 
> messages shown on the failure.  According to the source code I have, 
> the only silent failure in parport_register_device is:

Nothing immediately strikes me.

quoted text
> When I change the flags from PARPORT_FLAG_EXCL to 0 in the call to 
> parport_register_device, the call returns a non-zero to indicate success.

Do you have the printer driver loaded already ? (and does it behave if you
do rmmod lp first)

quoted text
> Can you tell me what I am missing?  Where can I get the actual source 
> code that goes with this version to further unravel this?

From the .fc6 it would be an old Fedora kernel so very close to standard
2.6.18 from kernel.org, but the Fedora Core kernels are available from the
Fedora download pages - the .srpm package for each kernel is the one
matching the same binary - so google for "2.6.18-1.2798.fc6.src.rpm"

http://www.mjmwired.net/resources/mjm-fedora-fc6.html has a few notes on it.


To be honest this area of the kernel hasn't changed much over recent times.
Let me know if you can't figure out what is going on.

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