usb: rename callback to handler to keep consistent

Signed-off-by: deadprogram <ron@hybridgroup.com>

src/machine/usb/hid/hid.go

@@ -20,35 +20,35 @@ const (
 )
 
 type hidDevicer interface {
-	Callback() bool
+	Handler() bool
 }
 
 var devices [5]hidDevicer
 var size int
 
-// SetCallbackHandler sets the callback. Only the first time it is called, it
+// SetHandler sets the handler. Only the first time it is called, it
 // calls machine.EnableHID for USB configuration
-func SetCallbackHandler(d hidDevicer) {
+func SetHandler(d hidDevicer) {
 	if size == 0 {
-		machine.EnableHID(callback, nil, callbackSetup)
+		machine.EnableHID(handler, nil, setupHandler)
 	}
 
 	devices[size] = d
 	size++
 }
 
-func callback() {
+func handler() {
 	for _, d := range devices {
 		if d == nil {
 			continue
 		}
-		if done := d.Callback(); done {
+		if done := d.Handler(); done {
 			return
 		}
 	}
 }
 
-func callbackSetup(setup machine.USBSetup) bool {
+func setupHandler(setup machine.USBSetup) bool {
 	ok := false
 	if setup.BmRequestType == usb_SET_REPORT_TYPE && setup.BRequest == usb_SET_IDLE {
 		machine.SendZlp()