pci_find_class -- begin or continue searching for a PCI device by class
struct pci_dev * pci_find_class
(unsigned int class, const struct pci_dev * from);
search for a PCI device with this class designation
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 class, 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 that point.