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authorMatt Carlson <mcarlson@broadcom.com>2010-02-26 14:04:41 +0000
committerDavid S. Miller <davem@davemloft.net>2010-02-28 00:43:32 -0800
commitb55ac1b22690d2e5b02a61cf6d69c2d66969c79d (patch)
treed336b38719dba482e2734f2091f5a60dfcb134b4 /drivers/pci/vpd.c
parent7ad506fa1adc2da3d394c562f09b8e1b3026c402 (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.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/pci/vpd.c b/drivers/pci/vpd.c
new file mode 100644
index 00000000000..6bc554576f8
--- /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);