diff --git a/mcp23xxx/doc.go b/mcp23xxx/doc.go
index cdc3d2b..34d44dd 100644
--- a/mcp23xxx/doc.go
+++ b/mcp23xxx/doc.go
@@ -3,9 +3,9 @@
 // that can be found in the LICENSE file.
 
 // Package mcp23xxx provides drivers for the MCP23XXX family of GPIO expanders.
-// It's availble with either I2C or SPI interfaces in 8 and 16 bit variants. 
+// It's availble with either I2C or SPI interfaces in 8 and 16 bit variants.
 // Additionally, variants are available that have Open-Drain outputs.
-// 
+//
 // # Datasheet
 //
 // https://ww1.microchip.com/downloads/en/DeviceDoc/20001952C.pdf
diff --git a/mcp23xxx/group.go b/mcp23xxx/group.go
index 7140510..cf9706d 100644
--- a/mcp23xxx/group.go
+++ b/mcp23xxx/group.go
@@ -45,8 +45,8 @@ func (pg *pinGroup) Pins() []pin.Pin {
 	pins := make([]pin.Pin, len(pg.pins))
 
 	for ix, p := range pg.pins {
-        pins[ix] = p
-    }
+		pins[ix] = p
+	}
 	return pins
 }
 
@@ -139,7 +139,7 @@ func (pg *pinGroup) Read(mask gpio.GPIOValue) (result gpio.GPIOValue, err error)
 			rmask |= (1 << pg.pins[bit].Number())
 		}
 	}
-	// Make sure the direction for the pins involved in this write read is 
+	// Make sure the direction for the pins involved in this write read is
 	// Input.
 	port := pg.pins[0].port
 	currentIn, err := port.iodir.readValue(true)
@@ -197,7 +197,7 @@ func (pg *pinGroup) Halt() error {
 			return r.Halt()
 		}
 	}
-    // TODO: I think we want to call Dev.Halt()
+	// TODO: I think we want to call Dev.Halt()
 	return nil
 }
 
diff --git a/mcp23xxx/mcp23xxx.go b/mcp23xxx/mcp23xxx.go
index 6f0736f..f396ec1 100644
--- a/mcp23xxx/mcp23xxx.go
+++ b/mcp23xxx/mcp23xxx.go
@@ -108,7 +108,7 @@ func makeDev(ra registerAccess, variant Variant, devicename string) (*Dev, error
 	for i := range ports {
 		// pre-cache iodir
 		_, err := ports[i].iodir.readValue(false)
-        if err != nil {
+		if err != nil {
 			return nil, err
 		}
 		pins[i] = ports[i].pins()