diff --git a/powerstats/DevfreqStateResidencyDataProvider.h b/powerstats/DevfreqStateResidencyDataProvider.h
new file mode 100644
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+++ b/powerstats/DevfreqStateResidencyDataProvider.h
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+/*
+ * Copyright (C) 2021 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.
+ */
+#pragma once
+
+#include <PowerStatsAidl.h>
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace power {
+namespace stats {
+
+class DevfreqStateResidencyDataProvider : public PowerStats::IStateResidencyDataProvider {
+  public:
+    DevfreqStateResidencyDataProvider(const std::string& name, const std::string& path);
+    ~DevfreqStateResidencyDataProvider() = default;
+
+    /*
+     * See IStateResidencyDataProvider::getStateResidencies
+     */
+    bool getStateResidencies(
+        std::unordered_map<std::string, std::vector<StateResidency>> *residencies) override;
+
+    /*
+     * See IStateResidencyDataProvider::getInfo
+     */
+    std::unordered_map<std::string, std::vector<State>> getInfo() override;
+
+  private:
+    bool extractNum(const char *str, char **str_end, int base, int64_t* num);
+    std::vector<std::pair<int64_t, int64_t>> parseTimeInState();
+    const std::string mName;
+    const std::string mPath;
+};
+
+}  // namespace stats
+}  // namespace power
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl