use the first 3 byte of the id of a 1-wire
or 6 if no OUI provided device to provide an Ethernet address
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@xxxxxxxxxxxx>
---
include/w1_mac_address.h | 72 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 72 insertions(+)
create mode 100644 include/w1_mac_address.h
diff --git a/include/w1_mac_address.h b/include/w1_mac_address.h
new file mode 100644
index 0000000..78348be
--- /dev/null
+++ b/include/w1_mac_address.h
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnio@xxxxxxxxxxxx>
+ *
+ * Under GPLv2 only
+ */
+
+#ifndef __W1_MAC_ADDRESS_H__
+#define __W1_MAC_ADDRESS_H__
+
+/**
+ * w1_mac_address_register - use the first 3 byte of the id of a 1-wire
+ * or 6 if no OUI provided device to provide an Ethernet address
+ * @ethid: ethernet device id
+ * @local: generate a local Ethernet address
+ * @oui: Ethernet OUI (3 bytes
+ * @w1_dev: 1-wire device name
+ *
+ * Generate a Ethernet address (MAC) that is not multicast using a 1-wire id.
+ */
+static inline int w1_mac_address_register(int ethid, bool local,
+ char * oui, char *w1_dev)
+{
+ char addr[6];
+ const char *val;
+ u64 id;
+ int nb_oui = 0;
+ int i, shift;
+ char *tmp = NULL;
+ int ret = 0;
+
+ if (!local && !oui)
+ return -EINVAL;
+
+ if (oui) {
+ nb_oui = 3;
+
+ for (i = 0; i < nb_oui; i++)
+ addr[i] = oui[i];
+ }
+
+ tmp = asprintf("%s.id", w1_dev);
+ if (!tmp)
+ return -ENOMEM;
+
+ val = getenv(tmp);
+ if (!val) {
+ ret = -EINVAL;
+ goto err;
+ }
+
+ id = simple_strtoull(val, NULL, 16);
+ if (!id) {
+ ret = -EINVAL;
+ goto err;
+ }
+
+ for (i = nb_oui, shift = 40; i < 6; i++, shift -= 8)
+ addr[i] = (id >> shift) & 0xff;
+
+ if (local) {
+ addr[0] &= 0xfe; /* clear multicast bit */
+ addr[0] |= 0x02; /* set local assignment bit (IEEE802) */
+ }
+
+ eth_register_ethaddr(ethid, addr);
+
+err:
+ free(tmp);
+ return ret;
+}
+
+#endif /* __W1_MAC_ADDRESS_H__ */
--
1.7.10.4
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