Let the i2c support be released

src/interface/i2c.rs

@@ -19,6 +19,11 @@ where
     pub fn new(i2c: I2C, addr: u8) -> Self {
         Self { i2c, addr }
     }
+
+    /// Release i2c
+    pub fn release(self) -> I2C {
+        self.i2c
+    }
 }
 
 impl<I2C, CommE> DisplayInterface for I2cInterface<I2C>

src/properties.rs

@@ -75,6 +75,11 @@ where
         Ok(())
     }
 
+    /// Set Display Off
+    pub fn off(&mut self) -> Result<(), DI::Error> {
+        Command::DisplayOn(false).send(&mut self.iface)
+    }
+
     /// Set the position in the framebuffer of the display where any sent data should be
     /// drawn. This method can be used for changing the affected area on the screen as well
     /// as (re-)setting the start point of the next `draw` call.
@@ -167,4 +172,9 @@ where
     pub fn set_contrast(&mut self, contrast: u8) -> Result<(), DI::Error> {
         Command::Contrast(contrast).send(&mut self.iface)
     }
+
+    /// Release iface
+    pub fn release(self) -> DI {
+        self.iface
+    }
 }