Re: [PARPORT] new ppdev operations

From: Tim Waugh (
Date: Tue Jun 19 2001 - 14:49:37 EDT

  • Next message: Philip Blundell: "Re: [PARPORT] new ppdev operations"

    On Tue, Jun 19, 2001 at 07:45:47PM +0200, Uwe Bonnes wrote:

    > What was the rational that the PPRECONTROL/PPWECONTROL/PPRFIFO/PPWFIFO iocts
    > were removed?

    User-space has no business playing with them. ppdev doesn't offer a
    PC-style port. It offers a defined set of operations on an IEEE 1284
    port, which may be a PC-style port with hardware assistance, or with
    no hardware assistance, or may be a different style of port altogether
    (perhaps it's memory mapped, or perhaps the registers are just
    different [older sparcs]).

    If someone thinks that they need to muck with the ECR to make their
    driver work, then they are probably writing a parallel _port_ driver,
    not a parallel port _device_ driver, and that belongs in the kernel.


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