diff options
| author | Matt Carlson <mcarlson@broadcom.com> | 2010-02-26 14:04:41 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-02-28 00:43:32 -0800 |
| commit | b55ac1b22690d2e5b02a61cf6d69c2d66969c79d (patch) | |
| tree | d336b38719dba482e2734f2091f5a60dfcb134b4 /drivers/pci/vpd.c | |
| parent | 7ad506fa1adc2da3d394c562f09b8e1b3026c402 (diff) | |
pci: Add helper to find a VPD resource data type
This patch adds the pci_vpd_find_tag() helper function to find VPD
resource data types in a buffer.
Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/pci/vpd.c')
| -rw-r--r-- | drivers/pci/vpd.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/pci/vpd.c b/drivers/pci/vpd.c new file mode 100644 index 000000000000..6bc554576f8d --- /dev/null +++ b/drivers/pci/vpd.c @@ -0,0 +1,43 @@ +/* + * File: vpd.c + * Purpose: Provide PCI VPD support + * + * Copyright (C) 2010 Broadcom Corporation. + */ + +#include <linux/pci.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); |