On Tue, May 15, 2007 at 05:15:28PM +0400, Manu Abraham wrote:
> Manu Abraham wrote:
> > Hi,
> >
> > I do have a device that's a multifunction device. Eventhough a MFD, it
> > just has one Interrupt which is shared by by a Configuration space for
> > each function. ie, INTA is shared between them functions.
> >
> > In such a case, i am wondering, (since pci_probe returns a pointer to
> > one PCI function alone and i need to use both the functions in one
> > module alone rather than using a module for each function and that the
> > functions are quite similar for them to be used in different modules,
> > such that a separate probe/ISR etc is used) whether using pci_get_device
> > would be a better alternative to do manual searching for the functions
> > in such a case.
> >
>
> Just figured out that pci_get_subsys() does work in a better. Looking at
> kernel sources all i find is just one single user of pci_get_subsys()
>
> building the code around pci_get_subsys(), does this have any negative
> impact ?
Yes:
- your device will not show up properly in sysfs (no
device/driver binding ability from userspace, no good
information so that udev can properly name the device, etc.)
- your driver will not work on any pci-hotplug type system (that
includes expresscard and pccard and lots of high-end servers.
- your driver will not be notified if the system is being
suspended or resumed or wanting to drop into a low power
state.
- another driver can bind to your device without you ever
knowing it.
So in short, use pci_probe and just handle the fact that you need to be
called for two PCI devices and bind to both of them. It shouldn't be
that hard...
thanks,
greg k-h
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