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

1 files changed, 2 insertions, 0 deletions

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();
     }