hw/input/stellaris_input: Convert to qdev

Convert the hw/input/stellaris_input device to qdev.

The interface uses an array property for the board to specify the
keycodes to use, so the s->keycodes memory is now allocated by the
array-property machinery.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20231030114802.3671871-6-peter.maydell@linaro.org

hw/arm/stellaris.c

@@ -31,6 +31,7 @@
 #include "hw/timer/stellaris-gptm.h"
 #include "hw/qdev-clock.h"
 #include "qom/object.h"
+#include "qapi/qmp/qlist.h"
 
 #define GPIO_A 0
 #define GPIO_B 1
@@ -1274,16 +1275,27 @@ static void stellaris_init(MachineState *ms, stellaris_board_info *board)
         sysbus_connect_irq(SYS_BUS_DEVICE(enet), 0, qdev_get_gpio_in(nvic, 42));
     }
     if (board->peripherals & BP_GAMEPAD) {
-        qemu_irq gpad_irq[5];
+        QList *gpad_keycode_list = qlist_new();
         static const int gpad_keycode[5] = { 0xc8, 0xd0, 0xcb, 0xcd, 0x1d };
+        DeviceState *gpad;
 
-        gpad_irq[0] = qemu_irq_invert(gpio_in[GPIO_E][0]); /* up */
-        gpad_irq[1] = qemu_irq_invert(gpio_in[GPIO_E][1]); /* down */
-        gpad_irq[2] = qemu_irq_invert(gpio_in[GPIO_E][2]); /* left */
-        gpad_irq[3] = qemu_irq_invert(gpio_in[GPIO_E][3]); /* right */
-        gpad_irq[4] = qemu_irq_invert(gpio_in[GPIO_F][1]); /* select */
+        gpad = qdev_new(TYPE_STELLARIS_GAMEPAD);
+        for (i = 0; i < ARRAY_SIZE(gpad_keycode); i++) {
+            qlist_append_int(gpad_keycode_list, gpad_keycode[i]);
+        }
+        qdev_prop_set_array(gpad, "keycodes", gpad_keycode_list);
+        sysbus_realize_and_unref(SYS_BUS_DEVICE(gpad), &error_fatal);
 
-        stellaris_gamepad_init(5, gpad_irq, gpad_keycode);
+        qdev_connect_gpio_out(gpad, 0,
+                              qemu_irq_invert(gpio_in[GPIO_E][0])); /* up */
+        qdev_connect_gpio_out(gpad, 1,
+                              qemu_irq_invert(gpio_in[GPIO_E][1])); /* down */
+        qdev_connect_gpio_out(gpad, 2,
+                              qemu_irq_invert(gpio_in[GPIO_E][2])); /* left */
+        qdev_connect_gpio_out(gpad, 3,
+                              qemu_irq_invert(gpio_in[GPIO_E][3])); /* right */
+        qdev_connect_gpio_out(gpad, 4,
+                              qemu_irq_invert(gpio_in[GPIO_F][1])); /* select */
     }
     for (i = 0; i < 7; i++) {
         if (board->dc4 & (1 << i)) {

hw/input/stellaris_gamepad.c

@@ -8,19 +8,13 @@
  */
 
 #include "qemu/osdep.h"
+#include "qapi/error.h"
 #include "hw/input/stellaris_gamepad.h"
 #include "hw/irq.h"
+#include "hw/qdev-properties.h"
 #include "migration/vmstate.h"
 #include "ui/console.h"
 
-typedef struct {
-    uint32_t num_buttons;
-    int extension;
-    qemu_irq *irqs;
-    uint32_t *keycodes;
-    uint8_t *pressed;
-} StellarisGamepad;
-
 static void stellaris_gamepad_put_key(void * opaque, int keycode)
 {
     StellarisGamepad *s = (StellarisGamepad *)opaque;
@@ -57,22 +51,52 @@ static const VMStateDescription vmstate_stellaris_gamepad = {
     }
 };
 
-/* Returns an array of 5 output slots.  */
-void stellaris_gamepad_init(int n, qemu_irq *irq, const int *keycode)
+static void stellaris_gamepad_realize(DeviceState *dev, Error **errp)
 {
-    StellarisGamepad *s;
-    int i;
+    StellarisGamepad *s = STELLARIS_GAMEPAD(dev);
 
-    s = g_new0(StellarisGamepad, 1);
-    s->irqs = g_new0(qemu_irq, n);
-    s->keycodes = g_new0(uint32_t, n);
-    s->pressed = g_new0(uint8_t, n);
-    for (i = 0; i < n; i++) {
-        s->irqs[i] = irq[i];
-        s->keycodes[i] = keycode[i];
+    if (s->num_buttons == 0) {
+        error_setg(errp, "keycodes property array must be set");
+        return;
     }
-    s->num_buttons = n;
-    qemu_add_kbd_event_handler(stellaris_gamepad_put_key, s);
-    vmstate_register(NULL, VMSTATE_INSTANCE_ID_ANY,
-                     &vmstate_stellaris_gamepad, s);
+
+    s->irqs = g_new0(qemu_irq, s->num_buttons);
+    s->pressed = g_new0(uint8_t, s->num_buttons);
+    qdev_init_gpio_out(dev, s->irqs, s->num_buttons);
+    qemu_add_kbd_event_handler(stellaris_gamepad_put_key, dev);
 }
+
+static void stellaris_gamepad_reset_enter(Object *obj, ResetType type)
+{
+    StellarisGamepad *s = STELLARIS_GAMEPAD(obj);
+
+    memset(s->pressed, 0, s->num_buttons * sizeof(uint8_t));
+}
+
+static Property stellaris_gamepad_properties[] = {
+    DEFINE_PROP_ARRAY("keycodes", StellarisGamepad, num_buttons,
+                      keycodes, qdev_prop_uint32, uint32_t),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void stellaris_gamepad_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    ResettableClass *rc = RESETTABLE_CLASS(klass);
+
+    rc->phases.enter = stellaris_gamepad_reset_enter;
+    dc->realize = stellaris_gamepad_realize;
+    dc->vmsd = &vmstate_stellaris_gamepad;
+    device_class_set_props(dc, stellaris_gamepad_properties);
+}
+
+static const TypeInfo stellaris_gamepad_info[] = {
+    {
+        .name = TYPE_STELLARIS_GAMEPAD,
+        .parent = TYPE_SYS_BUS_DEVICE,
+        .instance_size = sizeof(StellarisGamepad),
+        .class_init = stellaris_gamepad_class_init,
+    },
+};
+
+DEFINE_TYPES(stellaris_gamepad_info);

include/hw/input/stellaris_gamepad.h

@@ -11,8 +11,27 @@
 #ifndef HW_INPUT_STELLARIS_GAMEPAD_H
 #define HW_INPUT_STELLARIS_GAMEPAD_H
 
+#include "hw/sysbus.h"
+#include "qom/object.h"
 
-/* stellaris_gamepad.c */
-void stellaris_gamepad_init(int n, qemu_irq *irq, const int *keycode);
+/*
+ * QEMU interface:
+ *  + QOM array property "keycodes": uint32_t QEMU keycodes to handle
+ *  + unnamed GPIO outputs: one per keycode, in the same order as the
+ *    "keycodes" array property entries; asserted when key is down
+ */
+
+#define TYPE_STELLARIS_GAMEPAD "stellaris-gamepad"
+OBJECT_DECLARE_SIMPLE_TYPE(StellarisGamepad, STELLARIS_GAMEPAD)
+
+struct StellarisGamepad {
+    SysBusDevice parent_obj;
+
+    uint32_t num_buttons;
+    qemu_irq *irqs;
+    uint32_t *keycodes;
+    uint8_t *pressed;
+    int extension;
+};
 
 #endif