diff --git a/gpiogeneric.go b/gpiogeneric.go
index 3e6beef..6730133 100644
--- a/gpiogeneric.go
+++ b/gpiogeneric.go
@@ -6,45 +6,6 @@ import (
 	"github.com/golang/glog"
 )
 
-const (
-	CapNormal int = 1 << iota
-	CapI2C
-	CapUART
-	CapSPI
-	CapGPMC
-	CapLCD
-	CapPWM
-)
-
-type PinDesc struct {
-	N    int
-	IDs  []string
-	Caps int
-}
-
-type PinMap []*PinDesc
-
-func (m PinMap) Lookup(k interface{}) (*PinDesc, bool) {
-	switch key := k.(type) {
-	case int:
-		for i := range m {
-			if m[i].N == key {
-				return m[i], true
-			}
-		}
-	case string:
-		for i := range m {
-			for j := range m[i].IDs {
-				if m[i].IDs[j] == key {
-					return m[i], true
-				}
-			}
-		}
-	}
-
-	return nil, false
-}
-
 type pin interface {
 	Close() error
 }
diff --git a/pin.go b/pin.go
new file mode 100644
index 0000000..831a909
--- /dev/null
+++ b/pin.go
@@ -0,0 +1,40 @@
+package embd
+
+const (
+	CapNormal int = 1 << iota
+	CapI2C
+	CapUART
+	CapSPI
+	CapGPMC
+	CapLCD
+	CapPWM
+)
+
+type PinDesc struct {
+	N    int
+	IDs  []string
+	Caps int
+}
+
+type PinMap []*PinDesc
+
+func (m PinMap) Lookup(k interface{}) (*PinDesc, bool) {
+	switch key := k.(type) {
+	case int:
+		for i := range m {
+			if m[i].N == key {
+				return m[i], true
+			}
+		}
+	case string:
+		for i := range m {
+			for j := range m[i].IDs {
+				if m[i].IDs[j] == key {
+					return m[i], true
+				}
+			}
+		}
+	}
+
+	return nil, false
+}