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pci: Add helper to find a VPD resource data type

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This patch adds the pci_vpd_find_tag() helper function to find VPD
resource data types in a buffer.

Signed-off-by: Matt Carlson <[email protected]>
Signed-off-by: Michael Chan <[email protected]>
Acked-by: Jesse Barnes <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Matt Carlson 2010-02-26 14:04:41 +00:00 • committed by David S. Miller
commit b55ac1b226
5 changed files with 65 additions and 42 deletions
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2
drivers/pci/Makefile
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@ -4,7 +4,7 @@
obj-y += access.o bus.o probe.o remove.o pci.o quirks.o \
pci-driver.o search.o pci-sysfs.o rom.o setup-res.o \
irq.o
irq.o vpd.o
obj-$(CONFIG_PROC_FS) += proc.o
obj-$(CONFIG_SYSFS) += slot.o

43
drivers/pci/vpd.c Normal file
View file

@ -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);