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@jcrosoft.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
66 lines
1.3 KiB
C
66 lines
1.3 KiB
C
/*
|
|
* Copyright (C) 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnio@jcrosoft.com>
|
|
*
|
|
* Under GPLv2 only
|
|
*/
|
|
|
|
#ifndef __W1_MAC_ADDRESS_H__
|
|
#define __W1_MAC_ADDRESS_H__
|
|
|
|
/**
|
|
* w1_local_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
|
|
* @oui: Ethernet OUI (3 bytes)
|
|
* @w1_dev: 1-wire device name
|
|
*
|
|
* Generate a local Ethernet address (MAC) that is not multicast using a 1-wire id.
|
|
*/
|
|
static inline int w1_local_mac_address_register(int ethid, 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 (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;
|
|
|
|
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__ */
|