/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.server.power.batterysaver;
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import android.util.ArrayMap;
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import android.util.Slog;
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import com.android.internal.annotations.GuardedBy;
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import java.util.Map;
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/**
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* Helper to parse a list of "core-number:frequency" pairs concatenated with / as a separator,
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* and convert them into a map of "filename -> value" that should be written to
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* /sys/.../scaling_max_freq.
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*
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* Example input: "0:1900800/4:2500000", which will be converted into:
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* "/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq" "1900800"
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* "/sys/devices/system/cpu/cpu4/cpufreq/scaling_max_freq" "2500000"
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*
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* Test:
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atest $ANDROID_BUILD_TOP/frameworks/base/services/tests/servicestests/src/com/android/server/power/batterysaver/CpuFrequenciesTest.java
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*/
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public class CpuFrequencies {
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private static final String TAG = "CpuFrequencies";
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private final Object mLock = new Object();
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@GuardedBy("mLock")
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private final ArrayMap<Integer, Long> mCoreAndFrequencies = new ArrayMap<>();
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public CpuFrequencies() {
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}
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/**
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* Parse a string.
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*/
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public CpuFrequencies parseString(String cpuNumberAndFrequencies) {
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synchronized (mLock) {
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mCoreAndFrequencies.clear();
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try {
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for (String pair : cpuNumberAndFrequencies.split("/")) {
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pair = pair.trim();
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if (pair.length() == 0) {
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continue;
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}
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final String[] coreAndFreq = pair.split(":", 2);
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if (coreAndFreq.length != 2) {
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throw new IllegalArgumentException("Wrong format");
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}
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final int core = Integer.parseInt(coreAndFreq[0]);
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final long freq = Long.parseLong(coreAndFreq[1]);
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mCoreAndFrequencies.put(core, freq);
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}
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} catch (IllegalArgumentException e) {
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Slog.wtf(TAG, "Invalid configuration: '" + cpuNumberAndFrequencies + "'");
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}
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}
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return this;
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}
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/**
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* Return a new map containing the filename-value pairs.
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*/
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public ArrayMap<String, String> toSysFileMap() {
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final ArrayMap<String, String> map = new ArrayMap<>();
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addToSysFileMap(map);
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return map;
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}
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/**
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* Add the filename-value pairs to an existing map.
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*/
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public void addToSysFileMap(Map<String, String> map) {
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synchronized (mLock) {
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final int size = mCoreAndFrequencies.size();
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for (int i = 0; i < size; i++) {
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final int core = mCoreAndFrequencies.keyAt(i);
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final long freq = mCoreAndFrequencies.valueAt(i);
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final String file = "/sys/devices/system/cpu/cpu" + Integer.toString(core) +
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"/cpufreq/scaling_max_freq";
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map.put(file, Long.toString(freq));
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}
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}
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}
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}
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