Add getBatteryUsageHint() to BluetoothHeadset for power monitoring.

This is a monotonically increasing integer. Wraps to 0 at
Integer.MAX_INT, and at boot.
Current implementation returns the number of AT commands handled since
boot. This is a good indicator for spammy headset/handsfree units that
can keep the device awake by polling for cellular status updates. As a
rule of thumb, each AT command prevents the CPU from sleeping for 500 ms

4 files changed, 43 insertions, 1 deletions

diff --git a/core/java/android/bluetooth/BluetoothHeadset.java b/core/java/android/bluetooth/BluetoothHeadset.java
index e198435..fe1e09a 100644
--- a/core/java/android/bluetooth/BluetoothHeadset.java
+++ b/core/java/android/bluetooth/BluetoothHeadset.java
@@ -332,6 +332,31 @@ public class BluetoothHeadset {
     }
 
     /**
+     * Get battery usage hint for Bluetooth Headset service.
+     * This is a monotonically increasing integer. Wraps to 0 at
+     * Integer.MAX_INT, and at boot.
+     * Current implementation returns the number of AT commands handled since
+     * boot. This is a good indicator for spammy headset/handsfree units that
+     * can keep the device awake by polling for cellular status updates. As a
+     * rule of thumb, each AT command prevents the CPU from sleeping for 500 ms
+     * @return monotonically increasing battery usage hint, or a negative error
+     *         code on error
+     * @hide
+     */
+    public int getBatteryUsageHint() {
+        if (DBG) log("getBatteryUsageHint()");
+        if (mService != null) {
+            try {
+                return mService.getBatteryUsageHint();
+            } catch (RemoteException e) {Log.e(TAG, e.toString());}
+        } else {
+            Log.w(TAG, "Proxy not attached to service");
+            if (DBG) Log.d(TAG, Log.getStackTraceString(new Throwable()));
+        }
+        return -1;
+    }
+
+    /**
      * Check class bits for possible HSP or HFP support.
      * This is a simple heuristic that tries to guess if a device with the
      * given class bits might support HSP or HFP. It is not accurate for all
diff --git a/core/java/android/bluetooth/HeadsetBase.java b/core/java/android/bluetooth/HeadsetBase.java
index f31e7a2..f987ffd 100644
--- a/core/java/android/bluetooth/HeadsetBase.java
+++ b/core/java/android/bluetooth/HeadsetBase.java
@@ -40,6 +40,8 @@ public class HeadsetBase {
     public static final int DIRECTION_INCOMING = 1;
     public static final int DIRECTION_OUTGOING = 2;
 
+    private static int sAtInputCount = 0;  /* TODO: Consider not using a static variable */
+
     private final BluetoothDevice mBluetooth;
     private final String mAddress;
     private final int mRfcommChannel;
@@ -109,6 +111,14 @@ public class HeadsetBase {
         acquireWakeLock();
         long timestamp;
 
+        synchronized(HeadsetBase.class) {
+            if (sAtInputCount == Integer.MAX_VALUE) {
+                sAtInputCount = 0;
+            } else {
+                sAtInputCount++;
+            }
+        }
+
         if (DBG) timestamp = System.currentTimeMillis();
         AtCommandResult result = mAtParser.process(input);
         if (DBG) Log.d(TAG, "Processing " + input + " took " +
@@ -279,7 +289,11 @@ public class HeadsetBase {
         }
     }
 
-    private void log(String msg) {
+    public static int getAtInputCount() {
+        return sAtInputCount;
+    }
+
+    private static void log(String msg) {
         Log.d(TAG, msg);
     }
 }
diff --git a/core/java/android/bluetooth/IBluetoothHeadset.aidl b/core/java/android/bluetooth/IBluetoothHeadset.aidl
index 582d4e3..5f42fd6 100644
--- a/core/java/android/bluetooth/IBluetoothHeadset.aidl
+++ b/core/java/android/bluetooth/IBluetoothHeadset.aidl
@@ -31,4 +31,5 @@ interface IBluetoothHeadset {
     boolean stopVoiceRecognition();
     boolean setPriority(in String address, int priority);
     int getPriority(in String address);
+    int getBatteryUsageHint();
 }
diff --git a/core/java/android/server/BluetoothDeviceService.java b/core/java/android/server/BluetoothDeviceService.java
index 3a89abd..8c843ef 100644
--- a/core/java/android/server/BluetoothDeviceService.java
+++ b/core/java/android/server/BluetoothDeviceService.java
@@ -1224,6 +1224,8 @@ public class BluetoothDeviceService extends IBluetoothDevice.Stub {
             break;
         }
         pw.println("getHeadsetAddress() = " + headset.getHeadsetAddress());
+        pw.println("getBatteryUsageHint() = " + headset.getBatteryUsageHint());
+
         headset.close();
     }