Add reset to InputClassifier HAL

The reset will be used to prevent an inconsistent stream of
events to be sent to the HAL.

Bug: 111480215
Test: make only
Change-Id: I40c7d671f094065e3fcaff0d83e826c580dcae7a

input/classifier/1.0/IInputClassifier.hal

@@ -26,4 +26,16 @@ interface IInputClassifier {
    */
   classify(MotionEvent event) generates (Classification classification);
 
+  /**
+   * Called by the framework to reset the HAL internal state. The reset may be called
+   * to prevent an inconsistent stream of events to be sent to the HAL.
+   */
+  reset();
+
+  /**
+   * Called by the framework to reset the HAL internal state for a specific device.
+   * The reset may be called once device reset is received by the framework.
+   */
+  resetDevice(int32_t deviceId);
+
 };

input/classifier/1.0/default/InputClassifier.cpp

@@ -57,6 +57,18 @@ Return<Classification> InputClassifier::classify(const MotionEvent& event) {
     return Classification::NONE;
 }
 
+Return<void> InputClassifier::reset() {
+    // We don't have any internal state in this example implementation,
+    // so no work needed here.
+    return Void();
+}
+
+Return<void> InputClassifier::resetDevice(int32_t /*deviceId*/) {
+    // We don't have any internal per-device state in this example implementation,
+    // so no work needed here.
+    return Void();
+}
+
 }  // namespace implementation
 }  // namespace V1_0
 }  // namespace classifier

input/classifier/1.0/default/InputClassifier.h

@@ -34,6 +34,9 @@ struct InputClassifier : public IInputClassifier {
 
     Return<android::hardware::input::common::V1_0::Classification> classify(
             const android::hardware::input::common::V1_0::MotionEvent& event) override;
+
+    Return<void> reset() override;
+    Return<void> resetDevice(int32_t deviceId) override;
 };
 
 }  // namespace implementation