Re: [hpoj-devel] more code changes

[Tim W. <tw...@re...>]

On Thu, Mar 22, 2001 at 04:18:21PM -0800, PASCHAL,DAVID (HP-Roseville,ex1) wrote:

> ptal-mlcd accesses the parallel-port registers directly, bypassing the
> kernel parport drivers.  Once ptal-mlcd has initiated communication with the
> peripheral, it is in ECP mode (nSelectIn=1).

Gotcha.  You can't reserve IO regions from user space, can you?

Using /dev/parport0, you can try to get exclusive access to the port,
which will (a) load parport_lowlevel, and (b) make sure no other
device drivers can touch it.  But that's for 2.4.x only at the moment.

But for the mean time, yes I think opening /dev/lp0 and keeping it
open is a 'good enough' way to prevent pulled rugs.  It doesn't stop
the user from doing 'modprobe -r parport_probe; modprobe
parport_probe', but the user is supposed to be on your side in this
application I think.

Tim.
*/