[PATCH 4/7] PCI/VPD: Add pci_vpd_find_id_string()

[Heiner Kallweit <hkallweit1@gmail.com>]

Similar to pci_vpd_find_ro_info_keyword() provide an API function to
retrieve the ID string from VPD. This way callers don't have to deal
with low-level function pci_vpd_lrdt_size() any longer that can be
made private to the VPD core in a subsequent patch.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 drivers/pci/vpd.c   |  6 ++++++
 include/linux/pci.h | 10 ++++++++++
 2 files changed, 16 insertions(+)

diff --git a/drivers/pci/vpd.c b/drivers/pci/vpd.c
index b7bf014cc..79712b3d1 100644
--- a/drivers/pci/vpd.c
+++ b/drivers/pci/vpd.c
@@ -320,6 +320,12 @@ static int pci_vpd_find_tag(const u8 *buf, unsigned int len, u8 rdt, unsigned in
 	return -ENOENT;
 }
 
+int pci_vpd_find_id_string(const u8 *buf, unsigned int len, unsigned int *size)
+{
+	return pci_vpd_find_tag(buf, len, PCI_VPD_LRDT_ID_STRING, size);
+}
+EXPORT_SYMBOL_GPL(pci_vpd_find_id_string);
+
 static int pci_vpd_find_info_keyword(const u8 *buf, unsigned int off,
 			      unsigned int len, const char *kw)
 {
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 0d6c45b1b..f83930562 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -2350,6 +2350,16 @@ static inline u8 pci_vpd_info_field_size(const u8 *info_field)
  */
 void *pci_vpd_alloc(struct pci_dev *dev, unsigned int *size);
 
+/**
+ * pci_vpd_find_id_string - Locate id string in VPD
+ * @buf: Pointer to buffered VPD data
+ * @len: The length of the buffer area in which to search
+ * @size: Pointer to field where length of id string is returned
+ *
+ * Returns the index of the id string or -ENOENT if not found.
+ */
+int pci_vpd_find_id_string(const u8 *buf, unsigned int len, unsigned int *size);
+
 /**
  * pci_vpd_find_ro_info_keyword - Locate info field keyword in VPD RO section
  * @buf: Pointer to buffered VPD data
-- 
2.33.0