pl050: introduce PL050DeviceClass for the PL050 device

This will soon be used to store the reference to the PL050 parent device
for PL050_KBD_DEVICE and PL050_MOUSE_DEVICE.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Tested-by: Helge Deller <deller@gmx.de>
Acked-by: Helge Deller <deller@gmx.de>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20220712215251.7944-8-mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

hw/input/pl050.c

@@ -216,6 +216,8 @@ static const TypeInfo pl050_type_info = {
     .parent        = TYPE_SYS_BUS_DEVICE,
     .instance_init = pl050_init,
     .instance_size = sizeof(PL050State),
+    .class_init    = pl050_class_init,
+    .class_size    = sizeof(PL050DeviceClass),
     .abstract      = true,
     .class_init    = pl050_class_init,
 };

include/hw/input/pl050.h

@@ -16,8 +16,14 @@
 #include "hw/input/ps2.h"
 #include "hw/irq.h"
 
+struct PL050DeviceClass {
+    SysBusDeviceClass parent_class;
+
+    DeviceRealize parent_realize;
+};
+
 #define TYPE_PL050 "pl050"
-OBJECT_DECLARE_SIMPLE_TYPE(PL050State, PL050)
+OBJECT_DECLARE_TYPE(PL050State, PL050DeviceClass, PL050)
 
 struct PL050State {
     SysBusDevice parent_obj;