diff --git a/services/audioflinger/AudioHwDevice.h b/services/audioflinger/AudioHwDevice.h
index eb826c6..d4299b0 100644
--- a/services/audioflinger/AudioHwDevice.h
+++ b/services/audioflinger/AudioHwDevice.h
@@ -35,6 +35,9 @@
     enum Flags {
         AHWD_CAN_SET_MASTER_VOLUME  = 0x1,
         AHWD_CAN_SET_MASTER_MUTE    = 0x2,
+        // Means that this isn't a terminal module, and software patches
+        // are used to transport audio data further.
+        AHWD_IS_INSERT              = 0x4,
     };
 
     AudioHwDevice(audio_module_handle_t handle,
@@ -55,6 +58,10 @@
         return (0 != (mFlags & AHWD_CAN_SET_MASTER_MUTE));
     }
 
+    bool isInsert() const {
+        return (0 != (mFlags & AHWD_IS_INSERT));
+    }
+
     audio_module_handle_t handle() const { return mHandle; }
     const char *moduleName() const { return mModuleName; }
     sp<DeviceHalInterface> hwDevice() const { return mHwDevice; }