Re: [PARPORT] PCI parallel port card under rtlinux

From: Adam J. Richter (
Date: Tue Dec 19 2000 - 13:50:17 EST

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    >From: Tim Waugh <>
    >On Fri, Dec 15, 2000 at 02:21:25PM +0100, Gaspar Bakos wrote:
    >> The current setup uses an ISA bus card with two extra parallel ports (one
    >> for the telescope irq7, 0x378, another for the dome/building 0x278)
    >> I will have to upgrade to PCI. Could anyone tell me which PCI cards are
    >> supported and by what kernel modules/programs?

    >The authoritative answer comes from linux/drivers/misc/parport_pc.c:
    >it lists the PCI vendor and device IDs for all supported cards.

            From pci.ids from pciutils-2.1.8, it looks like it might
    be possible to match all parallel PCI cards by class:

    C 07 Communication controller
            01 Parallel controller
                    00 SPP
                    01 BiDir
                    02 ECP
                    03 IEEE1284
                    fe IEEE1284 Target

            So, I wonder if that pci_device_id declarations in
    parport_pc.c could be replaced with something like:

    static struct pci_device_id parport_pc_pci_tbl[] __devinitdata = {
              class: PCI_CLASS_COMMUNICATION_PARALLEL << 8,
              class_mask: 0xFFFFFC, /* lower 2 bits can be 0, 1, 2 or 3. */
           { } /* Terminating entry */

            I believe that, in theory, that last byte of the PCI class
    is supposed to identify the register-level interface, so the
    drivers should be compatible, hopefully.

            I have not tried this, and I do not know if all of the
    currently listed board export this PCI class (although I would
    imagine that they would). If not, then the particular board
    that did not export this class information would still have to be

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