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); 63