Re: [PARPORT] Parallel port user-space driver and interrupts

From: Carl Michal (
Date: Tue Apr 04 2000 - 14:05:40 EDT

  • Next message: Tim Waugh: "Re: [PARPORT] parallel port programming"


    I did know ppdev does this - but correct me if I'm wrong: ppdev in 2.2.x
    doesn't use hardware handshaking (big loss in speed, about a factor of
    15 when we tried it). Also, we burned a couple of days trying to read
    from the port with ppdev and never did get it to work. I vaguely
    remember looking through the archives here and think I remeber other
    people having had similar problems. I guess in 2.3 - 2.4 these problems
    are gone?


    On Tue, 4 Apr 2000, Tim Waugh wrote:

    > On Mon, 3 Apr 2000, Carl Michal wrote:
    > > Due to popular demand (4 requests so far!), I'm posting a simple
    > > kernel module which catches interrupts for delivery to user space
    > > programs. The authors of this module are most definitely novice kernel
    > > hackers, so a serious critique of this module would be appreciated.
    > > I have also some pseudo-code which outlines how our driver talks to
    > > the parallel port using hardware EPP reads and writes. We get about
    > > 1MB/s throughput on a SIIG ISA parallel port card.
    > You know that ppdev already does this, right?
    > Tim.
    > */

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