Merge "Define EventQueueFlagBits"

sensors/2.0/Android.bp

@@ -15,6 +15,7 @@ hidl_interface {
         "android.hidl.base@1.0",
     ],
     types: [
+        "EventQueueFlagBits",
         "SensorTimeout",
     ],
     gen_java: false,

sensors/2.0/ISensors.hal

@@ -67,6 +67,10 @@ interface ISensors {
      * Data may only be written to the Event FMQ. Data must not be read from
      * the Event FMQ since the framework is the only reader. Upon receiving
      * sensor events, the HAL should write the sensor events to the Event FMQ.
+     * Once the HAL is finished writing sensor events to the Event FMQ, the HAL
+     * must call the Event FMQ's EventFlag wake() function with the
+     * EventQueueFlagBits::READ_AND_PROCESS mask which notifies the framework
+     * that sensor events are available to be read and processed.
      *
      * The Wake Lock FMQ is used by the framework to notify the HAL when it is
      * safe to release its wake_lock. When the framework receives WAKE_UP events

sensors/2.0/types.hal

@@ -23,3 +23,10 @@ enum SensorTimeout : int32_t {
      */
     WAKE_LOCK_SECONDS = 1,
 };
+
+enum EventQueueFlagBits : uint32_t {
+    /**
+     * Used to notify the Event FMQ that events should be read and processed.
+     */
+    READ_AND_PROCESS = 1 << 0,
+};