OneWire bus impl

onewiredriver.go

@@ -0,0 +1,44 @@
+// Generic OneWire driver.
+
+package embd
+
+import "sync"
+
+type w1BusFactory func(byte) W1Bus
+
+type w1Driver struct {
+	busMap     map[byte]W1Bus
+	busMapLock sync.Mutex
+
+	ibf w1BusFactory
+}
+
+// NewW1Driver returns a W1Driver interface which allows control
+// over the OneWire subsystem.
+func NewW1Driver(ibf w1BusFactory) W1Driver {
+	return &w1Driver{
+		busMap: make(map[byte]W1Bus),
+		ibf:    ibf,
+	}
+}
+
+func (i *w1Driver) Bus(l byte) W1Bus {
+	i.busMapLock.Lock()
+	defer i.busMapLock.Unlock()
+
+	if b, ok := i.busMap[l]; ok {
+		return b
+	}
+
+	b := i.ibf(l)
+	i.busMap[l] = b
+	return b
+}
+
+func (i *w1Driver) Close() error {
+	for _, b := range i.busMap {
+		b.Close()
+	}
+
+	return nil
+}