centos man page for pci_find_ext_capability

PCI_FIND_EXT_CAPABIL(9) 					Hardware Interfaces					   PCI_FIND_EXT_CAPABIL(9)

NAME
       pci_find_ext_capability - Find an extended capability

SYNOPSIS
       int pci_find_ext_capability(struct pci_dev * dev, int cap);

ARGUMENTS
       dev
	   PCI device to query

       cap
	   capability code

DESCRIPTION
       Returns the address of the requested extended capability structure within the device's PCI configuration space or 0 if the device does not
       support it. Possible values for cap:

       PCI_EXT_CAP_ID_ERR Advanced Error Reporting PCI_EXT_CAP_ID_VC Virtual Channel PCI_EXT_CAP_ID_DSN Device Serial Number PCI_EXT_CAP_ID_PWR
       Power Budgeting

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   PCI_FIND_EXT_CAPABIL(9)