Add a new method PCI_FIND_EXTCAP() to the pci bus interface that is used

to search for a specific extended capability.  If the specified capability
is found for the given device, then the function returns success and
optionally returns the offset of that capability.  If the capability is
not found, the function returns an error.

1 files changed, 7 insertions, 0 deletions

diff --git a/sys/dev/pci/pci_if.m b/sys/dev/pci/pci_if.m
index 107746b..0de5696 100644
--- a/sys/dev/pci/pci_if.m
+++ b/sys/dev/pci/pci_if.m
@@ -82,3 +82,10 @@ METHOD int assign_interrupt {
 	device_t	dev;
 	device_t	child;
 };
+
+METHOD int find_extcap {
+	device_t	dev;
+	device_t	child;
+	int		capability;
+	int		*capreg;
+};