drivers/xen/pciback/conf_space_capability_vpd.c

   1 /*
   2  * PCI Backend - Configuration space overlay for Vital Product Data
   3  *
   4  * Author: Ryan Wilson <hap9@epoch.ncsc.mil>
   5  */
   6
   7 #include <linux/pci.h>
   8 #include "conf_space.h"
   9 #include "conf_space_capability.h"
  10
  11 static int vpd_address_write(struct pci_dev *dev, int offset, u16 value,
  12                              void *data)
  13 {
  14         /* Disallow writes to the vital product data */
  15         if (value & PCI_VPD_ADDR_F)
  16                 return PCIBIOS_SET_FAILED;
  17         else
  18                 return pci_write_config_word(dev, offset, value);
  19 }
  20
  21 static struct config_field caplist_vpd[] = {
  22         {
  23          .offset    = PCI_VPD_ADDR,
  24          .size      = 2,
  25          .u.w.read  = pciback_read_config_word,
  26          .u.w.write = vpd_address_write,
  27          },
  28         {
  29          .offset     = PCI_VPD_DATA,
  30          .size       = 4,
  31          .u.dw.read  = pciback_read_config_dword,
  32          .u.dw.write = NULL,
  33          },
  34         {
  35          .size = 0,
  36          },
  37 };
  38
  39 struct pciback_config_capability pciback_config_capability_vpd = {
  40         .capability = PCI_CAP_ID_VPD,
  41         .fields = caplist_vpd,
  42 };