[patch] pci probing

Jeff Garzik (jgarzik@pobox.com)
Sun, 12 Sep 1999 23:52:16 -0400

What do the Penguins At Large think about this? The following is a
presentation of simple PCI probe code which I think can be useful. It
is small, and can easily replace existing probe mechanisms. As the
structure itself is only three members, it is quick to put into the
code, and painless to maintain. For small or simple drivers this may be
enough. For more complex drivers, using a callback scheme makes it
easier to step up to the pci-scan code.

Regards,

Jeff


typedef int (*pci_simple_probe_callback) (struct pci_dev *dev, int
match_num,
void *dev_data, void *drvr_data);

struct pci_simple_probe_entry {
unsigned short vendor; /* vendor id, PCI_ANY_ID, or 0 for last entry */
unsigned short device; /* device id, PCI_ANY_ID, or 0 for last entry */
void *dev_data; /* driver-private, entry-specific data */
};

int pci_simple_probe (struct pci_simple_probe_entry *list, size_t
match_limit,
pci_simple_probe_callback cb, void *drvr_data)
{
struct pci_dev *dev;
struct pci_simple_probe_entry *ent;
size_t matches = 0;

if (!list || !cb)
return -ENODEV;

dev = pci_find_device (PCI_ANY_ID, PCI_ANY_ID, NULL);
while (dev) {
ent = list;
while (ent->vendor && ent->device) {
if (((PCI_ANY_ID != ent->vendor) &&
(dev->vendor != ent->vendor)) ||
((PCI_ANY_ID != ent->vendor) &&
(dev->device != ent->device)))
continue;

int rc = (* cb) (dev, matches, ent->dev_data,
drvr_data);
if (rc < 0)
return rc;

matches++;

if (match_limit && match_limit == matches)
return matches;

ent++;
}

dev = pci_find_device (PCI_ANY_ID, PCI_ANY_ID, dev);
}

return matches;
}

-- 
Custom driver development	|    Never worry about theory as long
Open source programming		|    as the machinery does what it's
				|    supposed to do.  -- R. A. Heinlein


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