Index: firmware/App/Modes/FPModes/ModeGenPermeate.c
===================================================================
diff -u -r973f790125e70115662d979f5f5631bb9df081f0 -r940437fb1298c036eeffbbfc8db1d43195e04927
--- firmware/App/Modes/FPModes/ModeGenPermeate.c	(.../ModeGenPermeate.c)	(revision 973f790125e70115662d979f5f5631bb9df081f0)
+++ firmware/App/Modes/FPModes/ModeGenPermeate.c	(.../ModeGenPermeate.c)	(revision 940437fb1298c036eeffbbfc8db1d43195e04927)
@@ -512,4 +512,59 @@
     return result;
 }
 
+/*********************************************************************//**
+ * @brief
+ * The testValidateGenPermeateChangeReq function validate whether requested
+ * sub mode change is legal or not.
+ * @details \b Inputs: none
+ * @details \b Outputs: none
+ * @param newSubMode the enumerated sub state of the mode.
+ * @return TRUE if request is legal, FALSE if not.
+ *************************************************************************/
+BOOL testValidateGenPermeateChangeReq( U32 newSubMode )
+{
+    BOOL result = FALSE;
+
+    if ( newSubMode < NUM_OF_FP_GENP_MODE_STATES )
+    {
+        switch ( newSubMode )
+        {
+            case FP_GENP_TANK_FILL_STATE:
+            case FP_GENP_TANK_FULL_STATE:
+            default:
+                result = TRUE;
+                break;
+        }
+    }
+
+    return result;
+}
+
+/*********************************************************************//**
+ * @brief
+ * The testSignalNewGenPermeateSubMode function requests transition to
+ * a new Gen Permeate sub mode.
+ * @details \b Inputs: none
+ * @details \b Outputs: none
+ * @param newSubMode the enumerated sub state of the mode.
+ * @return none
+ *************************************************************************/
+void testSignalNewGenPermeateSubMode( U32 newSubMode )
+{
+    if ( newSubMode < NUM_OF_FP_GENP_MODE_STATES )
+    {
+        genPermeateState = (FP_GENP_MODE_STATE_T)newSubMode;
+        // handle the prerequisite if any
+        switch ( newSubMode )
+        {
+            // Any of these state require no special handling
+            case FP_GENP_TANK_FILL_STATE:
+            case FP_GENP_TANK_FULL_STATE:
+            default:
+                break;
+        }
+        setModeGenPTransition( genPermeateState );
+    }
+}
+
 /**@}*/