vpd.c

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/*
 * File:    vpd.c
 * Purpose: Provide PCI VPD support
 *
 * Copyright (C) 2010 Broadcom Corporation.
 */

#include <linux/pci.h>
#include <linux/export.h>

int pci_vpd_find_tag(const u8 *buf, unsigned int off, unsigned int len, u8 rdt)
{
    int i;

    for (i = off; i < len; ) {
        u8 val = buf[i];

        if (val & PCI_VPD_LRDT) {
            /* Don't return success of the tag isn't complete */
            if (i + PCI_VPD_LRDT_TAG_SIZE > len)
                break;

            if (val == rdt)
                return i;

            i += PCI_VPD_LRDT_TAG_SIZE +
                 pci_vpd_lrdt_size(&buf[i]);
        } else {
            u8 tag = val & ~PCI_VPD_SRDT_LEN_MASK;

            if (tag == rdt)
                return i;

            if (tag == PCI_VPD_SRDT_END)
                break;

            i += PCI_VPD_SRDT_TAG_SIZE +
                 pci_vpd_srdt_size(&buf[i]);
        }
    }

    return -ENOENT;
}
EXPORT_SYMBOL_GPL(pci_vpd_find_tag);

int pci_vpd_find_info_keyword(const u8 *buf, unsigned int off,
                  unsigned int len, const char *kw)
{
    int i;

    for (i = off; i + PCI_VPD_INFO_FLD_HDR_SIZE <= off + len;) {
        if (buf[i + 0] == kw[0] &&
            buf[i + 1] == kw[1])
            return i;

        i += PCI_VPD_INFO_FLD_HDR_SIZE +
             pci_vpd_info_field_size(&buf[i]);
    }

    return -ENOENT;
}
EXPORT_SYMBOL_GPL(pci_vpd_find_info_keyword);