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

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Message-Id: <E1KiTmU-0001Xx-Td@be1.7eggert.dyndns.org>
Date:	Wed, 24 Sep 2008 14:47:46 +0200
From:	Bodo Eggert <7eggert@....de>
To:	Bill Unruh <unruh@...sics.ubc.ca>, linux-kernel@...r.kernel.org
Subject: Re: parport_pc disables parallel port on unload.

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.


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