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    SubjectRe: Displaying/modifying PCI device id tables via sysfs
    On 3 Mar 2003, Matt Domsch wrote:

    > /sys
    > `-- bus
    > `-- pci
    > `-- drivers
    > `-- 3c59x
    > |-- dynamic_id_0 (these are simple DRIVER_ATTRs)
    > |-- dynamic_id_1
    > |-- dynamic_id_2
    > `-- new_id
    > Where dynamic_id_[012] are new dynamic entries, created by writing
    > values into new_id. Both file types would be of the format (analogous
    > to pci_show_resources):
    > echo "0x0000 0x0000 0x0000 0x0000 0x0000 0x0000" > new_id
    > with fields being vendor, device, subvendor, subdevice, class,
    > class_mask.

    I dont' think what you actually want is changing the id table - after all,
    it's only walked when registering the driver (+ hotplug).

    What you really want is a way to call the drivers' probe routine for a
    device which isn't in its tables.

    So why not simply

    echo "0x0000 0x0000 0x0000 0x0000 0x0000 0x0000" > .../3c59x/probe

    It shares one caveat with the approach above, i.e. struct pci_device_id
    has a field called "unsigned long driver_data", and as such is really hard
    to fill from userspace. I think in the common case it's not used and can
    be just set to zero, but if the driver e.g. expects it to point to a
    driver-private structure describing the device, you lose.

    And you need one more thing, i.e. the ability to load a driver without
    hardware being present. E.g. pci_module_init() is supposed to return
    -ENODEV when modular and no hardware is found. Actually, it doesn't
    anymore, since someone (I think you, Pat ;) broke it.


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