powerstats: add common data providers in gs common

Bug: 206576142
Test: dumpsys android.hardware.power.stats.IPowerStats/default
Change-Id: Iee66356150a8bdfcd1e0b3fe8b8d5ec9f601f543
Signed-off-by: Darren Hsu <darrenhsu@google.com>

powerstats/include/DvfsStateResidencyDataProvider.h

@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2020 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 DvfsStateResidencyDataProvider : public PowerStats::IStateResidencyDataProvider {
+  public:
+    class Config {
+      public:
+        // Power entity name to parse.
+        std::string powerEntityName;
+
+        // List of state pairs (name to display, name to parse).
+        std::vector<std::pair<std::string, std::string>> states;
+    };
+    /*
+     * path - path to dvfs sysfs node.
+     * clockRate - clock rate in KHz.
+     */
+    DvfsStateResidencyDataProvider(std::string path, uint64_t clockRate, std::vector<Config> cfgs);
+    ~DvfsStateResidencyDataProvider() = 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:
+    int32_t matchEntity(char const *line);
+    int32_t matchState(char const *line, const Config& powerEntity);
+    bool parseState(char const *line, uint64_t *duration, uint64_t *count);
+
+    const std::string mPath;
+    const uint64_t mClockRate;
+    std::vector<Config> mPowerEntities;
+};
+
+}  // namespace stats
+}  // namespace power
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl