pckbd: switch I8042 device from update_irq() function to PS2 device gpio

Define a new qdev input gpio for handling incoming PS2 IRQs, and then wire up the
PS2 keyboard and mouse devices to use it. At the same time set update_irq() and
update_arg to NULL in ps2_kbd_init() and ps2_mouse_init() to ensure that any
accidental attempt to use the legacy update_irq() function will cause a NULL
pointer dereference.

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: <20220624134109.881989-53-mark.cave-ayland@ilande.co.uk>

1 files changed, 33 insertions, 4 deletions

diff --git a/hw/input/pckbd.c b/hw/input/pckbd.c
index ff76c0636d..18f27abc58 100644
--- a/hw/input/pckbd.c
+++ b/hw/input/pckbd.c
@@ -808,6 +808,23 @@ static const MemoryRegionOps i8042_cmd_ops = {
     .endianness = DEVICE_LITTLE_ENDIAN,
 };
 
+static void i8042_set_kbd_irq(void *opaque, int n, int level)
+{
+    ISAKBDState *s = I8042(opaque);
+    KBDState *ks = &s->kbd;
+
+    kbd_update_kbd_irq(ks, level);
+}
+
+static void i8042_set_mouse_irq(void *opaque, int n, int level)
+{
+    ISAKBDState *s = I8042(opaque);
+    KBDState *ks = &s->kbd;
+
+    kbd_update_aux_irq(ks, level);
+}
+
+
 static void i8042_reset(DeviceState *dev)
 {
     ISAKBDState *s = I8042(dev);
@@ -827,6 +844,12 @@ static void i8042_initfn(Object *obj)
                           "i8042-cmd", 1);
 
     qdev_init_gpio_out_named(DEVICE(obj), &s->a20_out, I8042_A20_LINE, 1);
+
+    qdev_init_gpio_out(DEVICE(obj), s->irqs, 2);
+    qdev_init_gpio_in_named(DEVICE(obj), i8042_set_kbd_irq,
+                            "ps2-kbd-input-irq", 1);
+    qdev_init_gpio_in_named(DEVICE(obj), i8042_set_mouse_irq,
+                            "ps2-mouse-input-irq", 1);
 }
 
 static void i8042_realizefn(DeviceState *dev, Error **errp)
@@ -847,14 +870,20 @@ static void i8042_realizefn(DeviceState *dev, Error **errp)
         return;
     }
 
-    s->irqs[I8042_KBD_IRQ] = isa_get_irq(isadev, isa_s->kbd_irq);
-    s->irqs[I8042_MOUSE_IRQ] = isa_get_irq(isadev, isa_s->mouse_irq);
+    isa_connect_gpio_out(isadev, I8042_KBD_IRQ, isa_s->kbd_irq);
+    isa_connect_gpio_out(isadev, I8042_MOUSE_IRQ, isa_s->mouse_irq);
 
     isa_register_ioport(isadev, isa_s->io + 0, 0x60);
     isa_register_ioport(isadev, isa_s->io + 1, 0x64);
 
-    s->kbd = ps2_kbd_init(kbd_update_kbd_irq, s);
-    s->mouse = ps2_mouse_init(kbd_update_aux_irq, s);
+    s->kbd = ps2_kbd_init(NULL, NULL);
+    qdev_connect_gpio_out(DEVICE(s->kbd), PS2_DEVICE_IRQ,
+                          qdev_get_gpio_in_named(dev, "ps2-kbd-input-irq",
+                                                 0));
+    s->mouse = ps2_mouse_init(NULL, NULL);
+    qdev_connect_gpio_out(DEVICE(s->mouse), PS2_DEVICE_IRQ,
+                          qdev_get_gpio_in_named(dev, "ps2-mouse-input-irq",
+                                                 0));
     if (isa_s->kbd_throttle && !isa_s->kbd.extended_state) {
         warn_report(TYPE_I8042 ": can't enable kbd-throttle without"
                     " extended-state, disabling kbd-throttle");