Add drivers for gpio and piface

emgauwa-lib/src/drivers/mod.rs

@@ -0,0 +1,17 @@
+mod gpio;
+mod piface;
+
+pub use gpio::GpioDriver;
+pub use piface::PifaceDriver;
+
+use crate::errors::EmgauwaError;
+
+pub trait RelayDriver {
+	fn get_high(&self, value: bool) -> bool {
+		value ^ self.get_inverted()
+	}
+
+	fn set(&mut self, value: bool) -> Result<(), EmgauwaError>;
+	fn get_pin(&self) -> u8;
+	fn get_inverted(&self) -> bool;
+}