linux-kernel - Re: parport_pc disables parallel port on unload.

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Message-ID: <Pine.LNX.4.64.0809240849210.28430@info.physics.ubc.ca>
Date:	Wed, 24 Sep 2008 08:50:03 -0700 (PDT)
From:	Bill Unruh <unruh@...sics.ubc.ca>
To:	Bodo Eggert <7eggert@....de>
cc:	linux-kernel@...r.kernel.org
Subject: Re: parport_pc disables parallel port on unload.

On Wed, 24 Sep 2008, Bodo Eggert wrote:

> Bill Unruh <unruh@...sics.ubc.ca> 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.

>
>

-- 
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@...sics.ubc.ca
Canada V6T 1Z1     |      and Gravity       |  www.theory.physics.ubc.ca/
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