video: tegra: nvmap: implement fast api functions
[linux-2.6.git] / 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);