Added input pin impl (requires unproven)

Author: ryankurte

Cargo.toml

@@ -9,7 +9,7 @@ repository = "https://github.com/japaric/linux-embedded-hal"
 version = "0.2.0"
 
 [dependencies]
-embedded-hal = "0.2.0"
+embedded-hal = { version = "0.2.0", features = ["unproven"] }
 i2cdev = "0.3.1"
 spidev = "0.3.0"
 sysfs_gpio = "0.5.1"

src/lib.rs

@@ -119,6 +119,16 @@ impl hal::digital::OutputPin for Pin {
     }
 }
 
+impl hal::digital::InputPin for Pin {
+    fn is_high(&self) -> bool{
+        self.0.get_value().unwrap() != 0
+    }
+
+    fn is_low(&self) -> bool{
+        self.0.get_value().unwrap() == 0 
+    }
+}
+
 impl ops::Deref for Pin {
     type Target = sysfs_gpio::Pin;