diff --git a/soundtrigger/ISoundTriggerHwService.cpp b/soundtrigger/ISoundTriggerHwService.cpp
index d44f5cb..bd107b4 100644
--- a/soundtrigger/ISoundTriggerHwService.cpp
+++ b/soundtrigger/ISoundTriggerHwService.cpp
@@ -50,7 +50,8 @@
     {
     }
 
-    virtual status_t listModules(struct sound_trigger_module_descriptor *modules,
+    virtual status_t listModules(const String16& opPackageName,
+                                 struct sound_trigger_module_descriptor *modules,
                                  uint32_t *numModules)
     {
         if (numModules == NULL || (*numModules != 0 && modules == NULL)) {
@@ -58,6 +59,7 @@
         }
         Parcel data, reply;
         data.writeInterfaceToken(ISoundTriggerHwService::getInterfaceDescriptor());
+        data.writeString16(opPackageName);
         unsigned int numModulesReq = (modules == NULL) ? 0 : *numModules;
         data.writeInt32(numModulesReq);
         status_t status = remote()->transact(LIST_MODULES, data, &reply);
@@ -77,12 +79,14 @@
         return status;
     }
 
-    virtual status_t attach(const sound_trigger_module_handle_t handle,
+    virtual status_t attach(const String16& opPackageName,
+                            const sound_trigger_module_handle_t handle,
                             const sp<ISoundTriggerClient>& client,
                             sp<ISoundTrigger>& module)
     {
         Parcel data, reply;
         data.writeInterfaceToken(ISoundTriggerHwService::getInterfaceDescriptor());
+        data.writeString16(opPackageName);
         data.write(&handle, sizeof(sound_trigger_module_handle_t));
         data.writeStrongBinder(IInterface::asBinder(client));
         status_t status = remote()->transact(ATTACH, data, &reply);
@@ -120,6 +124,11 @@
     switch(code) {
         case LIST_MODULES: {
             CHECK_INTERFACE(ISoundTriggerHwService, data, reply);
+            String16 opPackageName;
+            status_t status = data.readString16(&opPackageName);
+            if (status != NO_ERROR) {
+                return status;
+            }
             unsigned int numModulesReq = data.readInt32();
             if (numModulesReq > MAX_ITEMS_PER_LIST) {
                 numModulesReq = MAX_ITEMS_PER_LIST;
@@ -133,7 +142,7 @@
                 reply->writeInt32(0);
                 return NO_ERROR;
             }
-            status_t status = listModules(modules, &numModules);
+            status = listModules(opPackageName, modules, &numModules);
             reply->writeInt32(status);
             reply->writeInt32(numModules);
             ALOGV("LIST_MODULES status %d got numModules %d", status, numModules);
@@ -151,12 +160,17 @@
 
         case ATTACH: {
             CHECK_INTERFACE(ISoundTriggerHwService, data, reply);
+            String16 opPackageName;
+            status_t status = data.readString16(&opPackageName);
+            if (status != NO_ERROR) {
+                return status;
+            }
             sound_trigger_module_handle_t handle;
             data.read(&handle, sizeof(sound_trigger_module_handle_t));
             sp<ISoundTriggerClient> client =
                     interface_cast<ISoundTriggerClient>(data.readStrongBinder());
             sp<ISoundTrigger> module;
-            status_t status = attach(handle, client, module);
+            status = attach(opPackageName, handle, client, module);
             reply->writeInt32(status);
             if (module != 0) {
                 reply->writeInt32(1);