machine/usb/hid: add RxHandler interface

src/machine/usb/hid/hid.go

@@ -24,6 +24,7 @@ const (
 
 type hidDevicer interface {
 	Handler() bool
+	RxHandler([]byte) bool
 }
 
 var devices [5]hidDevicer
@@ -65,6 +66,17 @@ func handler() {
 	}
 }
 
+func rxHandler(b []byte) {
+	for _, d := range devices {
+		if d == nil {
+			continue
+		}
+		if done := d.RxHandler(b); done {
+			return
+		}
+	}
+}
+
 var DefaultSetupHandler = setupHandler
 
 func setupHandler(setup usb.Setup) bool {

src/machine/usb/hid/keyboard/keyboard.go

@@ -91,6 +91,10 @@ func (kb *keyboard) Handler() bool {
 	return false
 }
 
+func (kb *keyboard) RxHandler(b []byte) bool {
+	return false
+}
+
 func (kb *keyboard) tx(b []byte) {
 	if machine.USBDev.InitEndpointComplete {
 		if kb.waitTxc {

src/machine/usb/hid/mouse/mouse.go

@@ -57,6 +57,10 @@ func (m *mouse) Handler() bool {
 	return false
 }
 
+func (m *mouse) RxHandler(b []byte) bool {
+	return false
+}
+
 func (m *mouse) tx(b []byte) {
 	if machine.USBDev.InitEndpointComplete {
 		if m.waitTxc {