drivers/pci/vpd.c

   1 /*
   2  * File:        vpd.c
   3  * Purpose:     Provide PCI VPD support
   4  *
   5  * Copyright (C) 2010 Broadcom Corporation.
   6  */
   7
   8 #include <linux/pci.h>
   9 #include <linux/export.h>
  10
  11 int pci_vpd_find_tag(const u8 *buf, unsigned int off, unsigned int len, u8 rdt)
  12 {
  13         int i;
  14
  15         for (i = off; i < len; ) {
  16                 u8 val = buf[i];
  17
  18                 if (val & PCI_VPD_LRDT) {
  19                         /* Don't return success of the tag isn't complete */
  20                         if (i + PCI_VPD_LRDT_TAG_SIZE > len)
  21                                 break;
  22
  23                         if (val == rdt)
  24                                 return i;
  25
  26                         i += PCI_VPD_LRDT_TAG_SIZE +
  27                              pci_vpd_lrdt_size(&buf[i]);
  28                 } else {
  29                         u8 tag = val & ~PCI_VPD_SRDT_LEN_MASK;
  30
  31                         if (tag == rdt)
  32                                 return i;
  33
  34                         if (tag == PCI_VPD_SRDT_END)
  35                                 break;
  36
  37                         i += PCI_VPD_SRDT_TAG_SIZE +
  38                              pci_vpd_srdt_size(&buf[i]);
  39                 }
  40         }
  41
  42         return -ENOENT;
  43 }
  44 EXPORT_SYMBOL_GPL(pci_vpd_find_tag);
  45
  46 int pci_vpd_find_info_keyword(const u8 *buf, unsigned int off,
  47                               unsigned int len, const char *kw)
  48 {
  49         int i;
  50
  51         for (i = off; i + PCI_VPD_INFO_FLD_HDR_SIZE <= off + len;) {
  52                 if (buf[i + 0] == kw[0] &&
  53                     buf[i + 1] == kw[1])
  54                         return i;
  55
  56                 i += PCI_VPD_INFO_FLD_HDR_SIZE +
  57                      pci_vpd_info_field_size(&buf[i]);
  58         }
  59
  60         return -ENOENT;
  61 }
  62 EXPORT_SYMBOL_GPL(pci_vpd_find_info_keyword);