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 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 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