cmsdk: cmhw: Add UniqueDeviceId support

It's sometimes useful to know what physical device you're using.

CMHW SerialNumber and an "ro.serialno" property already exists, but
are not guaranteed to be unique. Different OEM may use overlapping
numbering schemes, and sometimes placeholder like "012345ABCDE" are
used.

Attempt to work around these shortcomings by defining a new
UniqueDeviceId class that provides a globally unique device ID that
is both deterministic for a given device and designed not to overlap
with IDs of any other devices.

Change-Id: I3f426972558394ba8e78261273ac8521aa603327

1 files changed, 20 insertions, 1 deletions

diff --git a/cm/lib/main/java/org/cyanogenmod/platform/internal/CMHardwareService.java b/cm/lib/main/java/org/cyanogenmod/platform/internal/CMHardwareService.java
index 05ee6c7..7031bd7 100644
--- a/cm/lib/main/java/org/cyanogenmod/platform/internal/CMHardwareService.java
+++ b/cm/lib/main/java/org/cyanogenmod/platform/internal/CMHardwareService.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2015 The CyanogenMod Project
+ * Copyright (C) 2015-2016 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.
@@ -50,6 +50,7 @@ import org.cyanogenmod.hardware.TapToWake;
 import org.cyanogenmod.hardware.ThermalMonitor;
 import org.cyanogenmod.hardware.ThermalUpdateCallback;
 import org.cyanogenmod.hardware.TouchscreenHovering;
+import org.cyanogenmod.hardware.UniqueDeviceId;
 import org.cyanogenmod.hardware.VibratorHW;
 
 /** @hide */
@@ -83,6 +84,7 @@ public class CMHardwareService extends SystemService implements ThermalUpdateCal
         public long getLtoDownloadInterval();
 
         public String getSerialNumber();
+        public String getUniqueDeviceId();
 
         public boolean requireAdaptiveBacklightForSunlightEnhancement();
         public boolean isSunlightEnhancementSelfManaged();
@@ -133,6 +135,8 @@ public class CMHardwareService extends SystemService implements ThermalUpdateCal
                 mSupportedFeatures |= CMHardwareManager.FEATURE_PERSISTENT_STORAGE;
             if (ThermalMonitor.isSupported())
                 mSupportedFeatures |= CMHardwareManager.FEATURE_THERMAL_MONITOR;
+            if (UniqueDeviceId.isSupported())
+                mSupportedFeatures |= CMHardwareManager.FEATURE_UNIQUE_DEVICE_ID;
         }
 
         public int getSupportedFeatures() {
@@ -295,6 +299,10 @@ public class CMHardwareService extends SystemService implements ThermalUpdateCal
             return SerialNumber.getSerialNumber();
         }
 
+        public String getUniqueDeviceId() {
+            return UniqueDeviceId.getUniqueDeviceId();
+        }
+
         public boolean requireAdaptiveBacklightForSunlightEnhancement() {
             return SunlightEnhancement.isAdaptiveBacklightRequired();
         }
@@ -524,6 +532,17 @@ public class CMHardwareService extends SystemService implements ThermalUpdateCal
         }
 
         @Override
+        public String getUniqueDeviceId() {
+            mContext.enforceCallingOrSelfPermission(
+                    cyanogenmod.platform.Manifest.permission.HARDWARE_ABSTRACTION_ACCESS, null);
+            if (!isSupported(CMHardwareManager.FEATURE_UNIQUE_DEVICE_ID)) {
+                Log.e(TAG, "Unique device ID is not supported");
+                return null;
+            }
+            return mCmHwImpl.getUniqueDeviceId();
+        }
+
+        @Override
         public boolean requireAdaptiveBacklightForSunlightEnhancement() {
             mContext.enforceCallingOrSelfPermission(
                     cyanogenmod.platform.Manifest.permission.HARDWARE_ABSTRACTION_ACCESS, null);