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
pci_vpd_find_tag(const u8 * buf,unsigned int off,unsigned int len,u8 rdt)10 int pci_vpd_find_tag(const u8 *buf, unsigned int off, unsigned int len, u8 rdt)
11 {
12 int i;
13
14 for (i = off; i < len; ) {
15 u8 val = buf[i];
16
17 if (val & PCI_VPD_LRDT) {
18 /* Don't return success of the tag isn't complete */
19 if (i + PCI_VPD_LRDT_TAG_SIZE > len)
20 break;
21
22 if (val == rdt)
23 return i;
24
25 i += PCI_VPD_LRDT_TAG_SIZE +
26 pci_vpd_lrdt_size(&buf[i]);
27 } else {
28 u8 tag = val & ~PCI_VPD_SRDT_LEN_MASK;
29
30 if (tag == rdt)
31 return i;
32
33 if (tag == PCI_VPD_SRDT_END)
34 break;
35
36 i += PCI_VPD_SRDT_TAG_SIZE +
37 pci_vpd_srdt_size(&buf[i]);
38 }
39 }
40
41 return -ENOENT;
42 }
43 EXPORT_SYMBOL_GPL(pci_vpd_find_tag);
44
pci_vpd_find_info_keyword(const u8 * buf,unsigned int off,unsigned int len,const char * kw)45 int pci_vpd_find_info_keyword(const u8 *buf, unsigned int off,
46 unsigned int len, const char *kw)
47 {
48 int i;
49
50 for (i = off; i + PCI_VPD_INFO_FLD_HDR_SIZE <= off + len;) {
51 if (buf[i + 0] == kw[0] &&
52 buf[i + 1] == kw[1])
53 return i;
54
55 i += PCI_VPD_INFO_FLD_HDR_SIZE +
56 pci_vpd_info_field_size(&buf[i]);
57 }
58
59 return -ENOENT;
60 }
61 EXPORT_SYMBOL_GPL(pci_vpd_find_info_keyword);
62