hw/char/escc: convert Sun mouse to use QemuInputHandler

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

Note that this conversion adds extra sunmouse_* members to ESCCChannelState
but they are not added to the migration stream (similar to the Sun keyboard
members). If this were desired in future, the Sun devices should be split
into separate devices and added to the migration stream there instead.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2518
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Tested-by: Carl Hauser <chauser@pullman.com>
Message-ID: <20240904102301.175706-1-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

2 files changed, 69 insertions, 22 deletions

diff --git a/hw/char/escc.c b/hw/char/escc.c
index b08819f23c..b1b1bbed15 100644
--- a/hw/char/escc.c
+++ b/hw/char/escc.c
@@ -287,6 +287,7 @@ static void escc_reset_chn(ESCCChannelState *s)
     s->rxint = s->txint = 0;
     s->rxint_under_svc = s->txint_under_svc = 0;
     s->e0_mode = s->led_mode = s->caps_lock_mode = s->num_lock_mode = 0;
+    s->sunmouse_dx = s->sunmouse_dy = s->sunmouse_buttons = 0;
     clear_queue(s);
 }
 
@@ -952,53 +953,96 @@ static void handle_kbd_command(ESCCChannelState *s, int val)
     }
 }
 
-static void sunmouse_event(void *opaque,
-                               int dx, int dy, int dz, int buttons_state)
+static void sunmouse_handle_event(DeviceState *dev, QemuConsole *src,
+                                  InputEvent *evt)
 {
-    ESCCChannelState *s = opaque;
-    int ch;
+    ESCCChannelState *s = (ESCCChannelState *)dev;
+    InputMoveEvent *move;
+    InputBtnEvent *btn;
+    static const int bmap[INPUT_BUTTON__MAX] = {
+        [INPUT_BUTTON_LEFT]   = 0x4,
+        [INPUT_BUTTON_MIDDLE] = 0x2,
+        [INPUT_BUTTON_RIGHT]  = 0x1,
+    };
+
+    switch (evt->type) {
+    case INPUT_EVENT_KIND_REL:
+        move = evt->u.rel.data;
+        if (move->axis == INPUT_AXIS_X) {
+            s->sunmouse_dx += move->value;
+        } else if (move->axis == INPUT_AXIS_Y) {
+            s->sunmouse_dy -= move->value;
+        }
+        break;
 
-    trace_escc_sunmouse_event(dx, dy, buttons_state);
-    ch = 0x80 | 0x7; /* protocol start byte, no buttons pressed */
+    case INPUT_EVENT_KIND_BTN:
+        btn = evt->u.btn.data;
+        if (bmap[btn->button]) {
+            if (btn->down) {
+                s->sunmouse_buttons |= bmap[btn->button];
+            } else {
+                s->sunmouse_buttons &= ~bmap[btn->button];
+            }
+            /* Indicate we have a supported button event */
+            s->sunmouse_buttons |= 0x80;
+        }
+        break;
 
-    if (buttons_state & MOUSE_EVENT_LBUTTON) {
-        ch ^= 0x4;
-    }
-    if (buttons_state & MOUSE_EVENT_MBUTTON) {
-        ch ^= 0x2;
+    default:
+        /* keep gcc happy */
+        break;
     }
-    if (buttons_state & MOUSE_EVENT_RBUTTON) {
-        ch ^= 0x1;
+}
+
+static void sunmouse_sync(DeviceState *dev)
+{
+    ESCCChannelState *s = (ESCCChannelState *)dev;
+    int ch;
+
+    if (s->sunmouse_dx == 0 && s->sunmouse_dy == 0 &&
+        (s->sunmouse_buttons & 0x80) == 0) {
+            /* Nothing to do after button event filter */
+            return;
     }
 
+    /* Clear our button event flag */
+    s->sunmouse_buttons &= ~0x80;
+    trace_escc_sunmouse_event(s->sunmouse_dx, s->sunmouse_dy,
+                              s->sunmouse_buttons);
+    ch = 0x80 | 0x7; /* protocol start byte, no buttons pressed */
+    ch ^= s->sunmouse_buttons;
     put_queue(s, ch);
 
-    ch = dx;
-
+    ch = s->sunmouse_dx;
     if (ch > 127) {
         ch = 127;
     } else if (ch < -127) {
         ch = -127;
     }
-
     put_queue(s, ch & 0xff);
+    s->sunmouse_dx -= ch;
 
-    ch = -dy;
-
+    ch = s->sunmouse_dy;
     if (ch > 127) {
         ch = 127;
     } else if (ch < -127) {
         ch = -127;
     }
-
     put_queue(s, ch & 0xff);
+    s->sunmouse_dy -= ch;
 
     /* MSC protocol specifies two extra motion bytes */
-
     put_queue(s, 0);
     put_queue(s, 0);
 }
 
+static const QemuInputHandler sunmouse_handler = {
+    .name  = "QEMU Sun Mouse",
+    .mask  = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_REL,
+    .event = sunmouse_handle_event,
+    .sync  = sunmouse_sync,
+};
+
 static void escc_init1(Object *obj)
 {
     ESCCState *s = ESCC(obj);
@@ -1036,8 +1080,8 @@ static void escc_realize(DeviceState *dev, Error **errp)
     }
 
     if (s->chn[0].type == escc_mouse) {
-        qemu_add_mouse_event_handler(sunmouse_event, &s->chn[0], 0,
-                                     "QEMU Sun Mouse");
+        s->chn[0].hs = qemu_input_handler_register((DeviceState *)(&s->chn[0]),
+                                                   &sunmouse_handler);
     }
     if (s->chn[1].type == escc_kbd) {
         s->chn[1].hs = qemu_input_handler_register((DeviceState *)(&s->chn[1]),
diff --git a/include/hw/char/escc.h b/include/hw/char/escc.h
index 5669a5b811..8c4c6a7730 100644
--- a/include/hw/char/escc.h
+++ b/include/hw/char/escc.h
@@ -46,6 +46,9 @@ typedef struct ESCCChannelState {
     uint8_t rx, tx;
     QemuInputHandlerState *hs;
     char *sunkbd_layout;
+    int sunmouse_dx;
+    int sunmouse_dy;
+    int sunmouse_buttons;
 } ESCCChannelState;
 
 struct ESCCState {