mail archive of the barebox mailing list
 help / color / mirror / Atom feed
From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
To: barebox@lists.infradead.org
Subject: [PATCH 2/8] w1: introduce helper to generate mac address from 1-wire id
Date: Tue, 30 Oct 2012 22:00:16 +0100	[thread overview]
Message-ID: <1351630822-20803-2-git-send-email-plagnioj@jcrosoft.com> (raw)
In-Reply-To: <1351630822-20803-1-git-send-email-plagnioj@jcrosoft.com>

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>
---
 include/w1_mac_address.h |   65 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 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..89dd914
--- /dev/null
+++ b/include/w1_mac_address.h
@@ -0,0 +1,65 @@
+/*
+ * 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__ */
-- 
1.7.10.4


_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

  reply	other threads:[~2012-10-30 21:02 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-10-30 20:54 [PATCH 0/8 v3] pm9g45/pm9253/pm9261: add 1-wire support Jean-Christophe PLAGNIOL-VILLARD
2012-10-30 21:00 ` [PATCH 1/8] arm: at91: add gpio_is_valid support Jean-Christophe PLAGNIOL-VILLARD
2012-10-30 21:00   ` Jean-Christophe PLAGNIOL-VILLARD [this message]
2012-10-30 21:00   ` [PATCH 3/8] pm9g45: add 1-wire support Jean-Christophe PLAGNIOL-VILLARD
2012-10-30 21:00   ` [PATCH 4/8] pm9g45: use w1 serial number to generate local mac address Jean-Christophe PLAGNIOL-VILLARD
2012-10-30 21:00   ` [PATCH 5/8] pm9263: add 1-wire support Jean-Christophe PLAGNIOL-VILLARD
2012-10-30 21:00   ` [PATCH 6/8] pm9263: use w1 serial number to generate local mac address Jean-Christophe PLAGNIOL-VILLARD
2012-10-30 21:00   ` [PATCH 7/8] pm9261: add 1-wire support Jean-Christophe PLAGNIOL-VILLARD
2012-10-30 21:00   ` [PATCH 8/8] pm9261: use w1 serial number to generate local mac address Jean-Christophe PLAGNIOL-VILLARD
2012-11-01 15:29 ` [PATCH 0/8 v3] pm9g45/pm9253/pm9261: add 1-wire support Sascha Hauer
  -- strict thread matches above, loose matches on Subject: below --
2012-10-29 13:40 [PATCH 0/8 v2:wqa] " Jean-Christophe PLAGNIOL-VILLARD
2012-10-29 13:46 ` [PATCH 1/8] arm: at91: add gpio_is_valid support Jean-Christophe PLAGNIOL-VILLARD
2012-10-29 13:46   ` [PATCH 2/8] w1: introduce helper to generate mac address from 1-wire id Jean-Christophe PLAGNIOL-VILLARD
2012-10-29 22:24     ` Sascha Hauer
2012-10-28  0:21 [PATCH 0/8] pm9g45/pm9253/pm9261: add 1-wire support Jean-Christophe PLAGNIOL-VILLARD
2012-10-28  0:24 ` [PATCH 1/8] arm: at91: add gpio_is_valid support Jean-Christophe PLAGNIOL-VILLARD
2012-10-28  0:24   ` [PATCH 2/8] w1: introduce helper to generate mac address from 1-wire id Jean-Christophe PLAGNIOL-VILLARD
2012-10-29  8:33     ` Sascha Hauer
2012-10-29 11:29       ` Jean-Christophe PLAGNIOL-VILLARD

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1351630822-20803-2-git-send-email-plagnioj@jcrosoft.com \
    --to=plagnioj@jcrosoft.com \
    --cc=barebox@lists.infradead.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox