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diff --git a/vibrator/cs40l26/tests/utils.h b/vibrator/cs40l26/tests/utils.h
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+++ b/vibrator/cs40l26/tests/utils.h
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+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * 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 ANDROID_HARDWARE_VIBRATOR_TEST_UTILS_H
+#define ANDROID_HARDWARE_VIBRATOR_TEST_UTILS_H
+
+#include <cmath>
+
+#include "types.h"
+
+static inline EffectScale toScale(float amplitude, float maximum) {
+    float ratio = 100; /* Unit: % */
+    if (maximum != 0)
+        ratio = amplitude / maximum * 100;
+
+    if (maximum == 0 || ratio > 100)
+        ratio = 100;
+
+    return std::round(ratio);
+}
+
+static inline EffectScale levelToScale(EffectLevel level) {
+    return toScale(level, 100);
+}
+
+static inline EffectScale amplitudeToScale(EffectAmplitude amplitude) {
+    return toScale(amplitude, 1.0f);
+}
+
+static inline uint32_t msToCycles(EffectDuration ms) {
+    return ms * 48;
+}
+
+#endif  // ANDROID_HARDWARE_VIBRATOR_TEST_UTILS_H