From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from 1.mo4.mail-out.ovh.net ([178.33.248.196] helo=mo4.mail-out.ovh.net) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1TSpiS-0000bm-NA for barebox@lists.infradead.org; Mon, 29 Oct 2012 13:49:24 +0000 Received: from mail172.ha.ovh.net (b7.ovh.net [213.186.33.57]) by mo4.mail-out.ovh.net (Postfix) with SMTP id B6473104EA09 for ; Mon, 29 Oct 2012 14:56:21 +0100 (CET) From: Jean-Christophe PLAGNIOL-VILLARD Date: Mon, 29 Oct 2012 14:46:58 +0100 Message-Id: <1351518424-29523-2-git-send-email-plagnioj@jcrosoft.com> In-Reply-To: <1351518424-29523-1-git-send-email-plagnioj@jcrosoft.com> References: <20121029134033.GH28904@game.jcrosoft.org> <1351518424-29523-1-git-send-email-plagnioj@jcrosoft.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: barebox-bounces@lists.infradead.org Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 2/8] w1: introduce helper to generate mac address from 1-wire id To: barebox@lists.infradead.org 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 --- 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 + * + * 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 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox