go fmt

controller/pcal9535a/pcal9535a.go

@@ -1,13 +1,31 @@
-// PCAL953A, low volage GPIO expander as found in the Raspberry
+/*
+ * Copyright (c) Clinton Freeman 2016
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
+ * associated documentation files (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge, publish, distribute,
+ * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or
+ * substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
+ * NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+// Package pcal9535a adds support for the low volage GPIO expander as found in the Raspberry
 // Pi Relay board by Seeed Studio.
-//
-// http://wiki.seeedstudio.com/wiki/Raspberry_Pi_Relay_Board_v1.0
 package pcal9535a
 
 import (
 	"github.com/cfreeman/embd"
 )
 
+// More details at - http://wiki.seeedstudio.com/wiki/Raspberry_Pi_Relay_Board_v1.0
 const (
 	REG_MODE = 0x06
 )
@@ -38,6 +56,7 @@ func (c *PCAL9535A) SetPin(pin uint, on bool) error {
 	return c.Bus.WriteByteToReg(c.Addr, REG_MODE, c.D)
 }
 
+// Gets the state of supplied pin true = high or on, while false = low or off.
 func (c *PCAL9535A) GetPin(pin uint) bool {
 	return (((c.D >> pin) & 1) == 0)
 }