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-rw-r--r--net/ethernet/eth.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index 58933fa50bb5..4c520110b04f 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -47,6 +47,7 @@
#include <linux/inet.h>
#include <linux/ip.h>
#include <linux/netdevice.h>
+#include <linux/nvmem-consumer.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/errno.h>
@@ -550,3 +551,40 @@ int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr)
return 0;
}
EXPORT_SYMBOL(eth_platform_get_mac_address);
+
+/**
+ * Obtain the MAC address from an nvmem cell named 'mac-address' associated
+ * with given device.
+ *
+ * @dev: Device with which the mac-address cell is associated.
+ * @addrbuf: Buffer to which the MAC address will be copied on success.
+ *
+ * Returns 0 on success or a negative error number on failure.
+ */
+int nvmem_get_mac_address(struct device *dev, void *addrbuf)
+{
+ struct nvmem_cell *cell;
+ const void *mac;
+ size_t len;
+
+ cell = nvmem_cell_get(dev, "mac-address");
+ if (IS_ERR(cell))
+ return PTR_ERR(cell);
+
+ mac = nvmem_cell_read(cell, &len);
+ nvmem_cell_put(cell);
+
+ if (IS_ERR(mac))
+ return PTR_ERR(mac);
+
+ if (len != ETH_ALEN || !is_valid_ether_addr(mac)) {
+ kfree(mac);
+ return -EINVAL;
+ }
+
+ ether_addr_copy(addrbuf, mac);
+ kfree(mac);
+
+ return 0;
+}
+EXPORT_SYMBOL(nvmem_get_mac_address);