diff --git a/soundtrigger/2.2/ISoundTriggerHw.hal b/soundtrigger/2.2/ISoundTriggerHw.hal
index fcb5087..a26896a 100644
--- a/soundtrigger/2.2/ISoundTriggerHw.hal
+++ b/soundtrigger/2.2/ISoundTriggerHw.hal
@@ -16,25 +16,27 @@
 
 package android.hardware.soundtrigger@2.2;
 
-import @2.0::ISoundTriggerHwCallback.RecognitionEvent;
 import @2.0::SoundModelHandle;
 import @2.1::ISoundTriggerHw;
 
 /**
- * SoundTrigger HAL interface. Used for hardware recognition of hotwords.
+ * SoundTrigger HAL interface. Used for hardware recognition of hotwords
+ * and other sounds.
  */
 interface ISoundTriggerHw extends @2.1::ISoundTriggerHw {
 
     /**
      * Get the state of a given model.
-     * The model state is returned as a RecognitionEvent.
-     * @param modelHandle The handle of the sound model to use for recognition
+     * The model state is returned asynchronously as a RecognitionEvent via
+     * the callback that was registered in StartRecognition().
+     * @param modelHandle The handle of the sound model whose state is being
+     *                    queried.
      * @return retval Operation completion status: 0 in case of success,
      *                -ENOSYS in case of invalid model handle,
      *                -ENOMEM in case of memory allocation failure,
-     *                -ENODEV in case of initialization error.
-     * @return state  RecognitionEvent in case of success
+     *                -ENODEV in case of initialization error,
+     *                -EINVAL in case where a recognition event is already
+     *                        being processed.
      */
-    getModelState(SoundModelHandle modelHandle)
-            generates (int32_t retval, @2.0::ISoundTriggerHwCallback.RecognitionEvent state);
+    getModelState(SoundModelHandle modelHandle) generates (int32_t retval);
 };
diff --git a/soundtrigger/2.2/default/SoundTriggerHw.cpp b/soundtrigger/2.2/default/SoundTriggerHw.cpp
index ffdf9fb..9d930ac 100644
--- a/soundtrigger/2.2/default/SoundTriggerHw.cpp
+++ b/soundtrigger/2.2/default/SoundTriggerHw.cpp
@@ -690,45 +690,26 @@
 
 // Begin V2_2 implementation
 
-Return<void> SoundTriggerHw::getModelState(int32_t modelHandle, getModelState_cb hidl_cb) {
-    int ret = 0;
-    V2_0::ISoundTriggerHwCallback::RecognitionEvent event;
-    struct sound_trigger_recognition_event* halEvent = NULL;
+Return<int32_t> SoundTriggerHw::getModelState(int32_t modelHandle) {
     sp<SoundModelClient> client;
     if (mHwDevice == NULL) {
-        ret = -ENODEV;
-        goto exit;
+        return -ENODEV;
     }
 
     {
         AutoMutex lock(mLock);
         client = mClients.valueFor(modelHandle);
         if (client == 0) {
-            ret = -ENOSYS;
-            goto exit;
+            return -ENOSYS;
         }
     }
 
     if (mHwDevice->get_model_state == NULL) {
         ALOGE("Failed to get model state from device, no such method");
-        ret = -ENODEV;
-        goto exit;
+        return -ENODEV;
     }
 
-    // Get the state from the device (as a recognition event)
-    halEvent = mHwDevice->get_model_state(mHwDevice, client->getHalHandle());
-    if (halEvent == NULL) {
-        ALOGE("Failed to get model state from device");
-        ret = -ENODEV;
-        goto exit;
-    }
-
-    convertRecognitionEventFromHal(&event, halEvent);
-
-exit:
-    hidl_cb(ret, event);
-    free(halEvent);
-    return Void();
+    return mHwDevice->get_model_state(mHwDevice, client->getHalHandle());
 }
 
 // Methods from ::android::hidl::base::V1_0::IBase follow.
diff --git a/soundtrigger/2.2/default/SoundTriggerHw.h b/soundtrigger/2.2/default/SoundTriggerHw.h
index 876b990..6676318 100644
--- a/soundtrigger/2.2/default/SoundTriggerHw.h
+++ b/soundtrigger/2.2/default/SoundTriggerHw.h
@@ -82,7 +82,7 @@
                                          int32_t cookie) override;
 
     // Methods from V2_2::ISoundTriggerHw follow.
-    Return<void> getModelState(int32_t modelHandle, getModelState_cb _hidl_cb) override;
+    Return<int32_t> getModelState(int32_t modelHandle) override;
 
     SoundTriggerHw();
 
diff --git a/soundtrigger/2.2/vts/functional/VtsHalSoundtriggerV2_2TargetTest.cpp b/soundtrigger/2.2/vts/functional/VtsHalSoundtriggerV2_2TargetTest.cpp
index a473c37..0f37816 100644
--- a/soundtrigger/2.2/vts/functional/VtsHalSoundtriggerV2_2TargetTest.cpp
+++ b/soundtrigger/2.2/vts/functional/VtsHalSoundtriggerV2_2TargetTest.cpp
@@ -74,21 +74,14 @@
  * Test ISoundTriggerHw::getModelState() method
  *
  * Verifies that:
- *  - the implementation returns -EINVAL with invalid model handle
+ *  - the implementation returns -ENOSYS with invalid model handle
  *
  */
 TEST_F(SoundTriggerHidlTest, GetModelStateInvalidModel) {
-    int ret = android::OK;
-    ::android::hardware::soundtrigger::V2_0::ISoundTriggerHwCallback::RecognitionEvent event;
     SoundModelHandle handle = 0;
-    Return<void> hidlReturn =
-        mSoundTriggerHal->getModelState(handle, [&](int32_t retval, auto res) {
-            ret = retval;
-            event = res;
-        });
-
+    Return<int32_t> hidlReturn = mSoundTriggerHal->getModelState(handle);
     EXPECT_TRUE(hidlReturn.isOk());
-    EXPECT_EQ(-ENOSYS, ret);
+    EXPECT_EQ(-ENOSYS, hidlReturn);
 }
 
 int main(int argc, char** argv) {