From 9d545566199c6b23ceeb7c4cb2c83b8f109c8ca9 Mon Sep 17 00:00:00 2001
From: armink <armink.ztl@gmail.com>
Date: Thu, 5 Oct 2017 16:20:21 +0800
Subject: [PATCH] [KConfig] Change the RT_DFS_ELM_USE_LFN cfg to choice.

---
 components/dfs/KConfig | 30 ++++++++++++++++++++++--------
 1 file changed, 22 insertions(+), 8 deletions(-)

diff --git a/components/dfs/KConfig b/components/dfs/KConfig
index 10ac11e76e..512b6f271a 100644
--- a/components/dfs/KConfig
+++ b/components/dfs/KConfig
@@ -29,15 +29,29 @@ if RT_USING_DFS
             int "OEM code page"
             default 437
         
+        choice 
+            prompt "Support long file name"
+            default RT_DFS_ELM_USE_LFN_0
+
+            config RT_DFS_ELM_USE_LFN_0
+                bool "0: LFN disable"
+
+            config RT_DFS_ELM_USE_LFN_1
+                bool "1: LFN with static LFN working buffer"
+
+            config RT_DFS_ELM_USE_LFN_2
+                bool "2: LFN with dynamic LFN working buffer on the stack"
+            
+            config RT_DFS_ELM_USE_LFN_3
+                bool "3: LFN with dynamic LFN working buffer on the heap"
+        endchoice
+        
         config RT_DFS_ELM_USE_LFN
-            int "Support long file name"
-            default 0
-            range 0 3
-            help
-                0: LFN disable
-                1: LFN with static LFN working buffer
-                2: LFN with dynamic LFN working buffer on the stack
-                3: LFN with dynamic LFN working buffer on the heap
+            int
+            default 0 if RT_DFS_ELM_USE_LFN_0
+            default 1 if RT_DFS_ELM_USE_LFN_1
+            default 2 if RT_DFS_ELM_USE_LFN_2
+            default 3 if RT_DFS_ELM_USE_LFN_3
         
         config RT_DFS_ELM_MAX_LFN
             int "Maximal size of file name length"