PCI vendor id to match, or PCI_ANY_ID to match all vendor ids
PCI device id to match, or PCI_ANY_ID to match all device ids
PCI subsystem vendor id to match, or PCI_ANY_ID to match all vendor ids
PCI subsystem device id to match, or PCI_ANY_ID to match all device ids
Previous PCI device found in search, or NULL for new search.
Iterates through the list of known PCI devices. If a PCI device is found with a matching vendor, device, ss_vendor and ss_device, a pointer to its device structure is returned. Otherwise, NULL is returned. A new search is initiated by passing NULL to the from argument. Otherwise if from is not NULL, searches continue from next device on the global list.