hw/input/adb-mouse: convert to use QemuInputHandler

Update the ADB mouse implementation to use QemuInputHandler instead of the
legacy qemu_add_mouse_event_handler() function.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20240907173700.348818-1-mark.cave-ayland@ilande.co.uk>
[PMD: Add comment about .sync handler]
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

hw/input/adb-mouse.c

@@ -38,6 +38,7 @@ struct MouseState {
     ADBDevice parent_obj;
     /*< private >*/
 
+    QemuInputHandlerState *hs;
     int buttons_state, last_buttons_state;
     int dx, dy, dz;
 };
@@ -51,17 +52,57 @@ struct ADBMouseClass {
     DeviceRealize parent_realize;
 };
 
-static void adb_mouse_event(void *opaque,
-                            int dx1, int dy1, int dz1, int buttons_state)
+#define ADB_MOUSE_BUTTON_LEFT   0x01
+#define ADB_MOUSE_BUTTON_RIGHT  0x02
+
+static void adb_mouse_handle_event(DeviceState *dev, QemuConsole *src,
+                                   InputEvent *evt)
 {
-    MouseState *s = opaque;
+    MouseState *s = (MouseState *)dev;
+    InputMoveEvent *move;
+    InputBtnEvent *btn;
+    static const int bmap[INPUT_BUTTON__MAX] = {
+        [INPUT_BUTTON_LEFT]   = ADB_MOUSE_BUTTON_LEFT,
+        [INPUT_BUTTON_RIGHT]  = ADB_MOUSE_BUTTON_RIGHT,
+    };
+
+    switch (evt->type) {
+    case INPUT_EVENT_KIND_REL:
+        move = evt->u.rel.data;
+        if (move->axis == INPUT_AXIS_X) {
+            s->dx += move->value;
+        } else if (move->axis == INPUT_AXIS_Y) {
+            s->dy += move->value;
+        }
+        break;
+
+    case INPUT_EVENT_KIND_BTN:
+        btn = evt->u.btn.data;
+        if (bmap[btn->button]) {
+            if (btn->down) {
+                s->buttons_state |= bmap[btn->button];
+            } else {
+                s->buttons_state &= ~bmap[btn->button];
+            }
+        }
+        break;
 
-    s->dx += dx1;
-    s->dy += dy1;
-    s->dz += dz1;
-    s->buttons_state = buttons_state;
+    default:
+        /* keep gcc happy */
+        break;
+    }
 }
 
+static const QemuInputHandler adb_mouse_handler = {
+    .name  = "QEMU ADB Mouse",
+    .mask  = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_REL,
+    .event = adb_mouse_handle_event,
+    /*
+     * We do not need the .sync handler because unlike e.g. PS/2 where async
+     * mouse events are sent over the serial port, an ADB mouse is constantly
+     * polled by the host via the adb_mouse_poll() callback.
+     */
+};
 
 static int adb_mouse_poll(ADBDevice *d, uint8_t *obuf)
 {
@@ -94,10 +135,10 @@ static int adb_mouse_poll(ADBDevice *d, uint8_t *obuf)
     dx &= 0x7f;
     dy &= 0x7f;
 
-    if (!(s->buttons_state & MOUSE_EVENT_LBUTTON)) {
+    if (!(s->buttons_state & ADB_MOUSE_BUTTON_LEFT)) {
         dy |= 0x80;
     }
-    if (!(s->buttons_state & MOUSE_EVENT_RBUTTON)) {
+    if (!(s->buttons_state & ADB_MOUSE_BUTTON_RIGHT)) {
         dx |= 0x80;
     }
 
@@ -236,7 +277,7 @@ static void adb_mouse_realizefn(DeviceState *dev, Error **errp)
 
     amc->parent_realize(dev, errp);
 
-    qemu_add_mouse_event_handler(adb_mouse_event, s, 0, "QEMU ADB Mouse");
+    s->hs = qemu_input_handler_register(dev, &adb_mouse_handler);
 }
 
 static void adb_mouse_initfn(Object *obj)