diff --git a/src/libboard_artiq/src/io_expander.rs b/src/libboard_artiq/src/io_expander.rs
index 43b57c7..d66d135 100644
--- a/src/libboard_artiq/src/io_expander.rs
+++ b/src/libboard_artiq/src/io_expander.rs
@@ -11,9 +11,9 @@ struct Registers {
 }
 
 //IO expanders pins
-const IO_DIR_INPUT_ALL: u8          = 0xFF;
+const IO_DIR_INPUT_ALL: u8 = 0xFF;
 const IO_DIR_OUT_SFP_TX_DISABLE: u8 = !0x02;
-const IO_DIR_OUT_SFP_LED:u8         = !0x40;
+const IO_DIR_OUT_SFP_LED: u8 = !0x40;
 //SFP0 LED has different place in v1.1
 #[cfg(hw_rev = "v1.0")]
 const IO_DIR_OUT_SFP0_LED: u8 = !0x40;
@@ -21,13 +21,15 @@ const IO_DIR_OUT_SFP0_LED: u8 = !0x40;
 const IO_DIR_OUT_SFP0_LED: u8 = !0x80;
 
 //IO expander port direction
-const IO_DIR_MAPPING0: [u8; 2] = [IO_DIR_INPUT_ALL & IO_DIR_OUT_SFP_TX_DISABLE & (IO_DIR_OUT_SFP0_LED),
-                                  IO_DIR_INPUT_ALL & IO_DIR_OUT_SFP_TX_DISABLE &  IO_DIR_OUT_SFP_LED];
-
-const IO_DIR_MAPPING1: [u8; 2] = [IO_DIR_INPUT_ALL & IO_DIR_OUT_SFP_TX_DISABLE & IO_DIR_OUT_SFP_LED,
-                                  IO_DIR_INPUT_ALL & IO_DIR_OUT_SFP_TX_DISABLE & IO_DIR_OUT_SFP_LED];
-
+const IO_DIR_MAPPING0: [u8; 2] = [
+    IO_DIR_INPUT_ALL & IO_DIR_OUT_SFP_TX_DISABLE & (IO_DIR_OUT_SFP0_LED),
+    IO_DIR_INPUT_ALL & IO_DIR_OUT_SFP_TX_DISABLE & IO_DIR_OUT_SFP_LED,
+];
 
+const IO_DIR_MAPPING1: [u8; 2] = [
+    IO_DIR_INPUT_ALL & IO_DIR_OUT_SFP_TX_DISABLE & IO_DIR_OUT_SFP_LED,
+    IO_DIR_INPUT_ALL & IO_DIR_OUT_SFP_TX_DISABLE & IO_DIR_OUT_SFP_LED,
+];
 
 pub struct IoExpander<'a> {
     i2c: &'a mut i2c::I2c,