Some Fixes For Gamepad.go

gamepad.go

@@ -61,6 +61,11 @@ type Gamepad interface {
 	// HatRelease will issue a hat-release event in the given direction
 	HatRelease(direction HatDirection) error
 
+  // LeftTriggerForce performs a trigger-axis-z event with a given force
+  LeftTriggerForce(value float32) error
+  // RightTriggerForce performs a trigger-axis-rz event with a given force
+  RightTriggerForce(value float32) error
+
 	io.Closer
 }
 
@@ -125,6 +130,14 @@ func (vg vGamepad) RightStickMoveY(value float32) error {
 	return vg.sendStickAxisEvent(absRY, value)
 }
 
+func (vg vGamepad) LeftTriggerForce(value float32) error {
+  return vg.sendStickAxisEvent(absZ, value)
+}
+
+func (vg vGamepad) RightTriggerForce(value float32) error {
+  return vg.sendStickAxisEvent(absRZ, value)
+}
+
 func (vg vGamepad) RightStickMove(x, y float32) error {
 	values := map[uint16]float32{}
 	values[absRX] = x
@@ -289,6 +302,27 @@ func createVGamepadDevice(path string, name []byte, vendor uint16, product uint1
 		absHat0Y,
 	}
 
+  //tell uinput what the minimum/maximum abs value is
+  var absMin [absSize]int32
+  absMin[absX] = -MaximumAxisValue
+  absMin[absY] = -MaximumAxisValue
+  absMin[absZ] = -MaximumAxisValue
+  absMin[absRX] = -MaximumAxisValue
+  absMin[absRY] = -MaximumAxisValue
+  absMin[absRZ] = -MaximumAxisValue
+  absMin[absHat0X] = -1
+  absMin[absHat0Y] = -1
+
+  var absMax [absSize]int32
+  absMax[absX] = MaximumAxisValue
+  absMax[absY] = MaximumAxisValue
+  absMax[absZ] = MaximumAxisValue
+  absMax[absRX] = MaximumAxisValue
+  absMax[absRY] = MaximumAxisValue
+  absMax[absRZ] = MaximumAxisValue
+  absMax[absHat0X] = 1
+  absMax[absHat0Y] = 1
+
 	deviceFile, err := createDeviceFile(path)
 	if err != nil {
 		return nil, fmt.Errorf("failed to create virtual gamepad device: %v", err)
@@ -331,7 +365,11 @@ func createVGamepadDevice(path string, name []byte, vendor uint16, product uint1
 				Bustype: busUsb,
 				Vendor:  vendor,
 				Product: product,
-				Version: 1}})
+				Version: 1,
+      },
+      Absmin: absMin,
+      Absmax: absMax,
+    })
 }
 
 // Takes in a normalized value (-1.0:1.0) and return an event value

gamepad_test.go

@@ -96,6 +96,34 @@ func TestAxisMovement(t *testing.T) {
 	}
 }
 
+//This test press the triggers with some amount of force
+func TestTriggerAxis(t *testing.T) {
+	vg, err := CreateGamepad("/dev/uinput", []byte("Hot gophers in your area"), 0xDEAD, 0xBEEF)
+	if err != nil {
+		t.Fatalf("Failed to create the virtual gamepad. Last error was: %s\n", err)
+	}
+
+	err = vg.LeftTriggerForce(1.0)
+	if err != nil {
+		t.Fatalf("Failed to send trigger axis event. Last error was: %s\n", err)
+	}
+
+	err = vg.RightTriggerForce(-1.0)
+	if err != nil {
+		t.Fatalf("Failed to send trigger axis event. Last error was: %s\n", err)
+	}
+
+	err = vg.LeftTriggerForce(-0.2)
+	if err != nil {
+		t.Fatalf("Failed to send trigger axis event. Last error was: %s\n", err)
+	}
+
+	err = vg.RightTriggerForce(0.2)
+	if err != nil {
+		t.Fatalf("Failed to send trigger axis event. Last error was: %s\n", err)
+	}
+}
+
 func TestHatMovement(t *testing.T) {
 	vg, err := CreateGamepad("/dev/uinput", []byte("Hot gophers in your area"), 0xDEAD, 0xBEEF)
 	if err != nil {