ps2: add gpio for output IRQ and optionally use it in ps2_raise_irq() and ps2_lower_irq()

Define the gpio for the PS2 output IRQ in ps2_init() and add logic to optionally
use it in ps2_raise_irq() and ps2_lower_irq() if the gpio is connected. If the
gpio is not connected then call the legacy update_irq() function as before.

This allows the incremental conversion of devices from the legacy update_irq()
function to use gpios instead.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Acked-by: Helge Deller <deller@gmx.de>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20220624134109.881989-35-mark.cave-ayland@ilande.co.uk>

2 files changed, 23 insertions, 2 deletions

diff --git a/hw/input/ps2.c b/hw/input/ps2.c
index bc0bcf1789..98c6206fb8 100644
--- a/hw/input/ps2.c
+++ b/hw/input/ps2.c
@@ -24,6 +24,7 @@
 
 #include "qemu/osdep.h"
 #include "qemu/log.h"
+#include "hw/irq.h"
 #include "hw/sysbus.h"
 #include "hw/input/ps2.h"
 #include "migration/vmstate.h"
@@ -174,12 +175,20 @@ void ps2_queue_noirq(PS2State *s, int b)
 
 static void ps2_raise_irq(PS2State *s)
 {
-    s->update_irq(s->update_arg, 1);
+    if (qemu_irq_is_connected(s->irq)) {
+        qemu_set_irq(s->irq, 1);
+    } else {
+        s->update_irq(s->update_arg, 1);
+    }
 }
 
 static void ps2_lower_irq(PS2State *s)
 {
-    s->update_irq(s->update_arg, 0);
+    if (qemu_irq_is_connected(s->irq)) {
+        qemu_set_irq(s->irq, 0);
+    } else {
+        s->update_irq(s->update_arg, 0);
+    }
 }
 
 void ps2_queue(PS2State *s, int b)
@@ -1305,6 +1314,13 @@ static const TypeInfo ps2_mouse_info = {
     .class_init    = ps2_mouse_class_init
 };
 
+static void ps2_init(Object *obj)
+{
+    PS2State *s = PS2_DEVICE(obj);
+
+    qdev_init_gpio_out(DEVICE(obj), &s->irq, 1);
+}
+
 static void ps2_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
@@ -1316,6 +1332,7 @@ static void ps2_class_init(ObjectClass *klass, void *data)
 static const TypeInfo ps2_info = {
     .name          = TYPE_PS2_DEVICE,
     .parent        = TYPE_SYS_BUS_DEVICE,
+    .instance_init = ps2_init,
     .instance_size = sizeof(PS2State),
     .class_init    = ps2_class_init,
     .class_size    = sizeof(PS2DeviceClass),
diff --git a/include/hw/input/ps2.h b/include/hw/input/ps2.h
index 410ec66baf..5422aee9aa 100644
--- a/include/hw/input/ps2.h
+++ b/include/hw/input/ps2.h
@@ -50,11 +50,15 @@ typedef struct {
     int rptr, wptr, cwptr, count;
 } PS2Queue;
 
+/* Output IRQ */
+#define PS2_DEVICE_IRQ      0
+
 struct PS2State {
     SysBusDevice parent_obj;
 
     PS2Queue queue;
     int32_t write_cmd;
+    qemu_irq irq;
     void (*update_irq)(void *, int);
     void *update_arg;
 };