Oddly, devices/input/input.c seems to reference a symbol which is in another module but is not exported.
Index: linux-2.6.15gum/lib/kobject.c
===================================================================
--- linux-2.6.15gum.orig/lib/kobject.c
+++ linux-2.6.15gum/lib/kobject.c
@@ -115,6 +115,7 @@ char *kobject_get_path(struct kobject *k
 
 	return path;
 }
+EXPORT_SYMBOL(kobject_get_path);
 
 /**
  *	kobject_init - initialize object.