pci_get_class — begin or continue searching for a PCI device by class
struct pci_dev * pci_get_class ( | unsigned int class, |
struct pci_dev * from) ; |
class
search for a PCI device with this class designation
from
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
, the reference count to the device is
incremented and a pointer to its device structure is returned.
Otherwise, NULL
is returned.
A new search is initiated by passing NULL
as the from
argument.
Otherwise if from
is not NULL
, searches continue from next device
on the global list. The reference count for from
is always decremented
if it is not NULL
.