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diff --git a/power/1.1/types.hal b/power/1.1/types.hal
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+/*
+ * Copyright (C) 2016 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.
+ */
+package android.hardware.power@1.1;
+
+/**
+ * Subsytem-level sleep state stats:
+ * PowerStateSubsystemSleepState represents the sleep states
+ * a subsystem (e.g. wifi, bt) is capable of getting into.
+ *
+ * SoCs like wifi, bt usually have more than one subsystem level sleep state.
+ */
+struct PowerStateSubsystemSleepState {
+    /**
+     * Subsystem-level Sleep state name.
+     */
+    string name;
+
+    /**
+     * Time spent in msec at this subsystem-level sleep state since boot.
+     */
+    uint64_t residencyInMsecSinceBoot;
+
+    /**
+     * Total number of times sub-system entered this state.
+     */
+    uint64_t totalTransitions;
+
+    /**
+     * Timestamp of last entry of this state measured in MSec
+     */
+    uint64_t lastEntryTimestampMs;
+
+    /**
+     * This subsystem-level sleep state can only be reached during system suspend
+     */
+    bool supportedOnlyInSuspend;
+};
+
+/**
+ * Subsytem-level sleep state stats:
+ * PowerStateSubsystem represents a subsystem (e.g. wifi, bt)
+ * and all the sleep states this susbsystem is capable of getting into.
+ *
+ * SoCs like wifi, bt usually have more than one subsystem level sleep state.
+ */
+struct PowerStateSubsystem {
+    /**
+     * Subsystem name (e.g. wifi, bt etc.)
+     */
+    string name;
+
+    /**
+     * states represents the list of sleep states supported by this susbsystem.
+     * Higher the index in the returned <states> vector deeper the state is
+     * i.e. lesser steady-state power is consumed by the subsystem to
+     * to be resident in that state.
+     *
+     * Vector of size zero implies either the info is not available
+     * or the subsystem does not have any sleep states.
+     */
+    vec<PowerStateSubsystemSleepState> states;
+};