spi: got rid of shouldInitialize arg in spibus (redundant).

host/bbb/bbb.go

@@ -180,7 +180,7 @@ func init() {
 				return embd.NewLEDDriver(ledMap, generic.NewLED)
 			},
 			SPIDriver: func() embd.SPIDriver {
-				return embd.NewSPIDriver(spiDeviceMinor, generic.NewSPIBus, true, spiInitializer)
+				return embd.NewSPIDriver(spiDeviceMinor, generic.NewSPIBus, spiInitializer)
 			},
 		}
 	})

host/generic/spibus.go

@@ -54,24 +54,22 @@ type spiBus struct {
 	spiTransferData spiIOCTransfer
 	initialized     bool
 
-	shouldInitialize bool
-	initializer      func() error
+	initializer func() error
 }
 
 func spiIOCMessageN(n uint32) uint32 {
 	return (spiIOCMessage0 + (n * spiIOCIncrementor))
 }
 
-func NewSPIBus(spiDevMinor, mode, channel byte, speed, bpw, delay int, shouldInitialize bool, i func() error) embd.SPIBus {
+func NewSPIBus(spiDevMinor, mode, channel byte, speed, bpw, delay int, i func() error) embd.SPIBus {
 	return &spiBus{
-		spiDevMinor:      spiDevMinor,
-		mode:             mode,
-		channel:          channel,
-		speed:            speed,
-		bpw:              bpw,
-		delayms:          delay,
-		shouldInitialize: shouldInitialize,
-		initializer:      i,
+		spiDevMinor: spiDevMinor,
+		mode:        mode,
+		channel:     channel,
+		speed:       speed,
+		bpw:         bpw,
+		delayms:     delay,
+		initializer: i,
 	}
 }
 
@@ -80,11 +78,10 @@ func (b *spiBus) init() error {
 		return nil
 	}
 
-	if b.shouldInitialize {
+	if b.initializer != nil {
 		if err := b.initializer(); err != nil {
 			return err
 		}
-		b.shouldInitialize = false
 	}
 
 	var err error
@@ -93,20 +90,17 @@ func (b *spiBus) init() error {
 	}
 	glog.V(3).Infof("spi: sucessfully opened file /dev/spidev%v.%v", b.spiDevMinor, b.channel)
 
-	err = b.setMode()
-	if err != nil {
+	if err = b.setMode(); err != nil {
 		return err
 	}
 
 	b.spiTransferData = spiIOCTransfer{}
 
-	err = b.setSpeed()
-	if err != nil {
+	if err = b.setSpeed(); err != nil {
 		return err
 	}
 
-	err = b.setBPW()
-	if err != nil {
+	if err = b.setBPW(); err != nil {
 		return err
 	}
 

host/rpi/rpi.go

@@ -77,7 +77,7 @@ func init() {
 				return embd.NewLEDDriver(ledMap, generic.NewLED)
 			},
 			SPIDriver: func() embd.SPIDriver {
-				return embd.NewSPIDriver(spiDeviceMinor, generic.NewSPIBus, false, nil)
+				return embd.NewSPIDriver(spiDeviceMinor, generic.NewSPIBus, nil)
 			},
 		}
 	})

spidriver.go

@@ -2,12 +2,11 @@ package embd
 
 import "sync"
 
-type spiBusFactory func(byte, byte, byte, int, int, int, bool, func() error) SPIBus
+type spiBusFactory func(byte, byte, byte, int, int, int, func() error) SPIBus
 
 type spiDriver struct {
-	spiDevMinor      byte
-	shouldInitialize bool
-	initializer      func() error
+	spiDevMinor byte
+	initializer func() error
 
 	busMap     map[byte]SPIBus
 	busMapLock sync.Mutex
@@ -15,12 +14,11 @@ type spiDriver struct {
 	sbf spiBusFactory
 }
 
-func NewSPIDriver(spiDevMinor byte, sbf spiBusFactory, shouldInitialize bool, i func() error) SPIDriver {
+func NewSPIDriver(spiDevMinor byte, sbf spiBusFactory, i func() error) SPIDriver {
 	return &spiDriver{
-		spiDevMinor:      spiDevMinor,
-		sbf:              sbf,
-		shouldInitialize: shouldInitialize,
-		initializer:      i,
+		spiDevMinor: spiDevMinor,
+		sbf:         sbf,
+		initializer: i,
 	}
 }
 
@@ -28,7 +26,7 @@ func (s *spiDriver) Bus(mode, channel byte, speed, bpw, delay int) SPIBus {
 	s.busMapLock.Lock()
 	defer s.busMapLock.Unlock()
 
-	b := s.sbf(s.spiDevMinor, mode, channel, speed, bpw, delay, s.shouldInitialize, s.initializer)
+	b := s.sbf(s.spiDevMinor, mode, channel, speed, bpw, delay, s.initializer)
 	s.busMap = make(map[byte]SPIBus)
 	s.busMap[channel] = b
 	return b