ar71xx: merge files-3.2 to files

[openwrt.git] / target / linux / ar71xx / files / arch / mips / ath79 / nvram.c

diff --git a/target/linux/ar71xx/files/arch/mips/ath79/nvram.c b/target/linux/ar71xx/files/arch/mips/ath79/nvram.c
new file mode 100644 (file)
index 0000000..43911b8
--- /dev/null
+++ b/target/linux/ar71xx/files/arch/mips/ath79/nvram.c
@@ -0,0 +1,75 @@
+/*
+ *  Atheros AR71xx minimal nvram support
+ *
+ *  Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/vmalloc.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/string.h>
+
+#include "nvram.h"
+
+char *ath79_nvram_find_var(const char *name, const char *buf, unsigned buf_len)
+{
+       unsigned len = strlen(name);
+       char *cur, *last;
+
+       if (buf_len == 0 || len == 0)
+               return NULL;
+
+       if (buf_len < len)
+               return NULL;
+
+       if (len == 1)
+               return memchr(buf, (int) *name, buf_len);
+
+       last = (char *) buf + buf_len - len;
+       for (cur = (char *) buf; cur <= last; cur++)
+               if (cur[0] == name[0] && memcmp(cur, name, len) == 0)
+                       return cur + len;
+
+       return NULL;
+}
+
+int ath79_nvram_parse_mac_addr(const char *nvram, unsigned nvram_len,
+                              const char *name, char *mac)
+{
+       char *buf;
+       char *mac_str;
+       int ret;
+       int t;
+
+       buf = vmalloc(nvram_len);
+       if (!buf)
+               return -ENOMEM;
+
+       memcpy(buf, nvram, nvram_len);
+       buf[nvram_len - 1] = '\0';
+
+       mac_str = ath79_nvram_find_var(name, buf, nvram_len);
+       if (!mac_str) {
+               ret = -EINVAL;
+               goto free;
+       }
+
+       t = sscanf(mac_str, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
+                  &mac[0], &mac[1], &mac[2], &mac[3], &mac[4], &mac[5]);
+
+       if (t != 6) {
+               ret = -EINVAL;
+               goto free;
+       }
+
+       ret = 0;
+
+free:
+       vfree(buf);
+       return ret;
+}