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diff --git a/libsensors/akmdfs/AKFS_APIs_8975/AKFS_Math.h b/libsensors/akmdfs/AKFS_APIs_8975/AKFS_Math.h
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+/******************************************************************************
+ *
+ * Copyright (C) 2012 Asahi Kasei Microdevices Corporation, Japan
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ ******************************************************************************/
+#ifndef AKFS_INC_MATH_H
+#define AKFS_INC_MATH_H
+
+#include <math.h>
+#include "AKFS_Configure.h"
+
+/***** Constant definition ****************************************************/
+#define AKFS_PI 3.141592654f
+#define RAD2DEG(rad) ((rad)*180.0f/AKFS_PI)
+
+/***** Macro definition *******************************************************/
+
+#ifdef AKFS_PRECISION_DOUBLE
+#define AKFS_SIN(x) sin(x)
+#define AKFS_COS(x) cos(x)
+#define AKFS_ASIN(x) asin(x)
+#define AKFS_ACOS(x) acos(x)
+#define AKFS_ATAN2(y, x) atan2((y), (x))
+#define AKFS_SQRT(x) sqrt(x)
+#else
+#define AKFS_SIN(x) sinf(x)
+#define AKFS_COS(x) cosf(x)
+#define AKFS_ASIN(x) asinf(x)
+#define AKFS_ACOS(x) acosf(x)
+#define AKFS_ATAN2(y, x) atan2f((y), (x))
+#define AKFS_SQRT(x) sqrtf(x)
+#endif
+
+#endif
+