68 lines
2.0 KiB
Java
68 lines
2.0 KiB
Java
/*
|
|
* Copyright (C) 2016 The CyanogenMod 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 org.cyanogenmod.hardware;
|
|
|
|
import org.cyanogenmod.internal.util.FileUtils;
|
|
|
|
/**
|
|
* Generate a unique but deterministic ID for this hardware, based on unchangeable
|
|
* hardware serial numbers.
|
|
*/
|
|
public class UniqueDeviceId {
|
|
private static final int TYPE_MMC0_CID = 0;
|
|
|
|
private static String sUniqueId = null;
|
|
|
|
/**
|
|
* Whether device supports reporting a unique device id.
|
|
*
|
|
* @return boolean Supported devices must return always true
|
|
*/
|
|
public static boolean isSupported() {
|
|
return getUniqueDeviceIdInternal() != null;
|
|
}
|
|
|
|
/**
|
|
* This method retreives a unique ID for the device.
|
|
*
|
|
* @return String The unique device ID
|
|
*/
|
|
public static String getUniqueDeviceId() {
|
|
return getUniqueDeviceIdInternal();
|
|
}
|
|
|
|
private static String getUniqueDeviceIdInternal() {
|
|
if (sUniqueId != null) {
|
|
return sUniqueId;
|
|
}
|
|
|
|
String sMmcType = FileUtils.readOneLine("/sys/block/mmcblk0/device/type");
|
|
String sCid = FileUtils.readOneLine("/sys/block/mmcblk0/device/cid");
|
|
if ("MMC".equals(sMmcType) && sCid != null) {
|
|
sCid = sCid.trim();
|
|
if (sCid.length() == 32) {
|
|
sUniqueId = String.format("%03x00000%32s", TYPE_MMC0_CID, sCid);
|
|
return sUniqueId;
|
|
}
|
|
}
|
|
|
|
/* Any additional types should be added here. */
|
|
|
|
return null;
|
|
}
|
|
}
|