diff options
Diffstat (limited to 'drivers/pci/search.c')
| -rw-r--r-- | drivers/pci/search.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/pci/search.c b/drivers/pci/search.c index b4c138a6ec02..53840634fbfc 100644 --- a/drivers/pci/search.c +++ b/drivers/pci/search.c @@ -364,6 +364,37 @@ struct pci_dev *pci_get_class(unsigned int class, struct pci_dev *from) EXPORT_SYMBOL(pci_get_class); /** + * pci_get_base_class - searching for a PCI device by matching against the base class code only + * @class: search for a PCI device with this base class code + * @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 base class code, the reference count to the device is + * incremented. See pci_match_one_device() to figure out how does this works. + * 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. + * + * Returns: + * A pointer to a matched PCI device, %NULL Otherwise. + */ +struct pci_dev *pci_get_base_class(unsigned int class, struct pci_dev *from) +{ + struct pci_device_id id = { + .vendor = PCI_ANY_ID, + .device = PCI_ANY_ID, + .subvendor = PCI_ANY_ID, + .subdevice = PCI_ANY_ID, + .class_mask = 0xFF0000, + .class = class << 16, + }; + + return pci_get_dev_by_id(&id, from); +} +EXPORT_SYMBOL(pci_get_base_class); + +/** * pci_dev_present - Returns 1 if device matching the device list is present, 0 if not. * @ids: A pointer to a null terminated list of struct pci_device_id structures * that describe the type of PCI device the caller is trying to find. |