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diff --git a/firmware/e300/battery/utils.h b/firmware/e300/battery/utils.h
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+++ b/firmware/e300/battery/utils.h
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+/* USRP E310 Firmware Misc utility macros
+ * Copyright (C) 2014 Ettus Research
+ * This file is part of the USRP E310 Firmware
+ * The USRP E310 Firmware is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ * The USRP E310 Firmware is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ * You should have received a copy of the GNU General Public License
+ * along with the USRP E310 Firmware. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * \file utils.h
+ * \brief Misc utility macros
+ */
+
+#ifndef UTILS_H
+#define UTILS_H
+
+#include <stddef.h>
+
+/**
+ * \brief Returns the size of a (static) array
+ *
+ * \param x Array
+ * \warning Do NOT use on pointers
+ */
+#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
+
+
+/**
+ * \brief A ISO compliant version of the linux kernel's container_of macro.
+ *        This allows implementing multiple interfaces in a struct.
+ */
+#ifdef __GNUC__
+#define member_type(type, member) __typeof__ (((type *)0)->member)
+#else
+#define member_type(type, member) const void
+#endif
+
+#define container_of(ptr, type, member) ((type *)( \
+    (char *)(member_type(type, member) *){ ptr } - offsetof(type, member)))
+
+/**
+ * \brief Convenience macro to make bitmasks more readable
+ */
+#define BIT(bit) (1 << (bit))
+
+#endif /* UTILS_H */