gpio: analog pin support for the bbb

gpiodriver_test.go

@@ -2,6 +2,46 @@ package embd
 
 import "testing"
 
+type fakeDigitalPin struct {
+	n int
+}
+
+func (p *fakeDigitalPin) N() int {
+	return p.n
+}
+
+func (*fakeDigitalPin) SetDirection(dir Direction) error {
+	return nil
+}
+
+func (*fakeDigitalPin) Read() (int, error) {
+	return 0, nil
+}
+
+func (*fakeDigitalPin) Write(val int) error {
+	return nil
+}
+
+func (*fakeDigitalPin) ActiveLow(b bool) error {
+	return nil
+}
+
+func (*fakeDigitalPin) PullUp() error {
+	return nil
+}
+
+func (*fakeDigitalPin) PullDown() error {
+	return nil
+}
+
+func (*fakeDigitalPin) Close() error {
+	return nil
+}
+
+func newFakeDigitalPin(n int) DigitalPin {
+	return &fakeDigitalPin{n}
+}
+
 func TestGpioDriverDigitalPin(t *testing.T) {
 	var tests = []struct {
 		key interface{}
@@ -12,15 +52,86 @@ func TestGpioDriverDigitalPin(t *testing.T) {
 	var pinMap = PinMap{
 		&PinDesc{ID: "P1_1", Aliases: []string{"1"}, Caps: CapNormal, DigitalLogical: 1},
 	}
-	driver := newGPIODriver(pinMap)
+	driver := newGPIODriver(pinMap, newFakeDigitalPin, nil)
 	for _, test := range tests {
-		pin, err := driver.digitalPin(test.key)
+		pin, err := driver.DigitalPin(test.key)
 		if err != nil {
 			t.Errorf("Looking up %v: unexpected error: %v", test.key, err)
 			continue
 		}
-		if pin.n != test.n {
-			t.Errorf("Looking up %v: got %v, want %v", test.key, pin.n, test.n)
+		if pin.N() != test.n {
+			t.Errorf("Looking up %v: got %v, want %v", test.key, pin.N(), test.n)
 		}
 	}
 }
+
+type fakeAnalogPin struct {
+	n int
+}
+
+func (p *fakeAnalogPin) N() int {
+	return p.n
+}
+
+func (*fakeAnalogPin) Read() (int, error) {
+	return 0, nil
+}
+
+func (*fakeAnalogPin) Write(val int) error {
+	return nil
+}
+
+func (*fakeAnalogPin) Close() error {
+	return nil
+}
+
+func newFakeAnalogPin(n int) AnalogPin {
+	return &fakeAnalogPin{n}
+}
+
+func TestGpioDriverAnalogPin(t *testing.T) {
+	var tests = []struct {
+		key interface{}
+		n   int
+	}{
+		{1, 1},
+	}
+	var pinMap = PinMap{
+		&PinDesc{ID: "P1_1", Aliases: []string{"1"}, Caps: CapAnalog, AnalogLogical: 1},
+	}
+	driver := newGPIODriver(pinMap, nil, newFakeAnalogPin)
+	for _, test := range tests {
+		pin, err := driver.AnalogPin(test.key)
+		if err != nil {
+			t.Errorf("Looking up %v: unexpected error: %v", test.key, err)
+			continue
+		}
+		if pin.N() != test.n {
+			t.Errorf("Looking up %v: got %v, want %v", test.key, pin.N(), test.n)
+		}
+	}
+}
+
+func TestGpioDriverUnavailablePinType(t *testing.T) {
+	var pinMap = PinMap{
+		&PinDesc{ID: "P1_1", Aliases: []string{"1"}, Caps: CapNormal, DigitalLogical: 1},
+		&PinDesc{ID: "P1_2", Aliases: []string{"1"}, Caps: CapAnalog, AnalogLogical: 1},
+	}
+	driver := newGPIODriver(pinMap, nil, nil)
+	_, err := driver.DigitalPin(1)
+	if err == nil {
+		t.Fatal("Looking up digital pin 1: did not get error")
+	}
+	expected := "gpio: digital io not supported on this host"
+	if err.Error() != expected {
+		t.Fatalf("Looking up digital pin 1: got error %q, expected %q", err, expected)
+	}
+	_, err = driver.AnalogPin(1)
+	if err == nil {
+		t.Fatal("Looking up analog pin 1: did not get error")
+	}
+	expected = "gpio: analog io not supported on this host"
+	if err.Error() != expected {
+		t.Fatalf("Looking up analog pin 1: got error %q, expected %q", err, expected)
+	}
+}