diff --git a/convertors/mcp3008/mcp3008.go b/convertors/mcp3008/mcp3008.go
index 64f6106..716d437 100644
--- a/convertors/mcp3008/mcp3008.go
+++ b/convertors/mcp3008/mcp3008.go
@@ -5,16 +5,22 @@ import (
 	"github.com/kidoman/embd"
 )
 
-// MCP3008 represents a mcp3008 8bit DAC
+// MCP3008 represents a mcp3008 8bit DAC.
 type MCP3008 struct {
-	mode byte
+	Mode byte
 
-	bus embd.SPIBus
+	Bus embd.SPIBus
 }
 
-var SingleMode byte = 1
-var DifferenceMode byte = 0
+const (
+	// SingleMode represents the single-ended mode for the mcp3008.
+	SingleMode = 1
 
+	// DifferenceMode represents the diffenrential mode for the mcp3008.
+	DifferenceMode = 0
+)
+
+// New creates a representation of the mcp3008 convertor
 func New(mode byte, bus embd.SPIBus) *MCP3008 {
 	return &MCP3008{mode, bus}
 }
@@ -23,14 +29,15 @@ const (
 	startBit = 1
 )
 
+// AnalogValueAt returns the analog value at the given channel of the convertor.
 func (m *MCP3008) AnalogValueAt(chanNum int) (int, error) {
 	var data [3]uint8
 	data[0] = startBit
-	data[1] = uint8(m.mode)<<7 | uint8(chanNum)<<4
+	data[1] = uint8(m.Mode)<<7 | uint8(chanNum)<<4
 	data[2] = 0
 
 	glog.V(2).Infof("mcp3008: sendingdata buffer %v", data)
-	if err := m.bus.TransferAndRecieveData(data[:]); err != nil {
+	if err := m.Bus.TransferAndRecieveData(data[:]); err != nil {
 		return 0, err
 	}
 
diff --git a/host/generic/spibus.go b/host/generic/spibus.go
index 9857a38..a90fb0c 100644
--- a/host/generic/spibus.go
+++ b/host/generic/spibus.go
@@ -23,9 +23,9 @@ const (
 	spiIOCMessage0    = 1073769216 //0x40006B00
 	spiIOCIncrementor = 2097152    //0x200000
 
-	defaultDelayms  = uint16(0)
-	defaultSPIBPW   = uint8(8)
-	defaultSPISpeed = uint32(1000000)
+	defaultDelayms  = 0
+	defaultSPIBPW   = 8
+	defaultSPISpeed = 1000000
 )
 
 type spiIOCTransfer struct {
@@ -115,12 +115,11 @@ func (b *spiBus) init() error {
 
 func (b *spiBus) setMode() error {
 	var mode = uint8(b.mode)
-	var err error
 	glog.V(3).Infof("spi: setting spi mode to %v", mode)
 
 	_, _, errno := syscall.Syscall(syscall.SYS_IOCTL, b.file.Fd(), spiIOCWrMode, uintptr(unsafe.Pointer(&mode)))
 	if errno != 0 {
-		err = syscall.Errno(errno)
+		err := syscall.Errno(errno)
 		glog.V(3).Infof("spi: failed to set mode due to %v", err.Error())
 		return err
 	}
@@ -129,7 +128,7 @@ func (b *spiBus) setMode() error {
 }
 
 func (b *spiBus) setSpeed() error {
-	speed := defaultSPISpeed
+	var speed uint32 = defaultSPISpeed
 	if b.speed > 0 {
 		speed = uint32(b.speed)
 	}
@@ -148,7 +147,7 @@ func (b *spiBus) setSpeed() error {
 }
 
 func (b *spiBus) setBPW() error {
-	bpw := defaultSPIBPW
+	var bpw uint8 = defaultSPIBPW
 	if b.bpw > 0 {
 		bpw = uint8(b.bpw)
 	}
@@ -166,7 +165,7 @@ func (b *spiBus) setBPW() error {
 }
 
 func (b *spiBus) setDelay() {
-	delay := defaultDelayms
+	var delay uint16 = defaultDelayms
 	if b.delayms > 0 {
 		delay = uint16(b.delayms)
 	}