Re: parport_pc disables parallel port on unload.

From: Bill Unruh
Date: Wed Sep 24 2008 - 11:50:19 EST


On Wed, 24 Sep 2008, Bodo Eggert wrote:

Bill Unruh <unruh@xxxxxxxxxxxxxx> wrote:

I have a parallel port module gps.c which I have written ( after the short
module described in Linux Device Drivers), whose purpose is to timestamp
the occurance of interrupts on the parallel port Ack line to as high a
temporal accuracy as possible.These are generated by the PPS line of a Gamin
18LVC gps receiver. Since I want the highest accuracy possible I do not want
the latency of going through the stock drivers and waiting for a poll or
select to let me know an interrupt has occured.

So, could anyone point me to some relatively comprehensible documentation (
or "canned program") to show me how to switch the parallel port back on if
unloading parport_pc has switched it off.

You can copy/paste the relevant parts from the parport_pc driver.

Of course, then, identifying the relevant parts becomes the problem, but
thank you.




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William G. Unruh | Canadian Institute for| Tel: +1(604)822-3273
Physics&Astronomy | Advanced Research | Fax: +1(604)822-5324
UBC, Vancouver,BC | Program in Cosmology | unruh@xxxxxxxxxxxxxx
Canada V6T 1Z1 | and Gravity | www.theory.physics.ubc.ca/
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