diff --git a/hw/arm/spitz.c b/hw/arm/spitz.c
index 93a25edcb5..fa592aad6d 100644
--- a/hw/arm/spitz.c
+++ b/hw/arm/spitz.c
@@ -696,13 +696,14 @@ static void corgi_ssp_gpio_cs(void *opaque, int line, int level)
 
 static void spitz_adc_temp_on(void *opaque, int line, int level)
 {
+    int batt_temp;
+
     if (!max1111)
         return;
 
-    if (level)
-        max111x_set_input(max1111, MAX1111_BATT_TEMP, SPITZ_BATTERY_TEMP);
-    else
-        max111x_set_input(max1111, MAX1111_BATT_TEMP, 0);
+    batt_temp = level ? SPITZ_BATTERY_TEMP : 0;
+
+    qemu_set_irq(qdev_get_gpio_in(max1111, MAX1111_BATT_TEMP), batt_temp);
 }
 
 static void corgi_ssp_realize(SSISlave *d, Error **errp)
diff --git a/hw/misc/max111x.c b/hw/misc/max111x.c
index abddfa3c66..3a5cb83844 100644
--- a/hw/misc/max111x.c
+++ b/hw/misc/max111x.c
@@ -131,12 +131,21 @@ static const VMStateDescription vmstate_max111x = {
     }
 };
 
+static void max111x_input_set(void *opaque, int line, int value)
+{
+    MAX111xState *s = MAX_111X(opaque);
+
+    assert(line >= 0 && line < s->inputs);
+    s->input[line] = value;
+}
+
 static int max111x_init(SSISlave *d, int inputs)
 {
     DeviceState *dev = DEVICE(d);
     MAX111xState *s = MAX_111X(dev);
 
     qdev_init_gpio_out(dev, &s->interrupt, 1);
+    qdev_init_gpio_in(dev, max111x_input_set, inputs);
 
     s->inputs = inputs;
 
@@ -153,13 +162,6 @@ static void max1111_realize(SSISlave *dev, Error **errp)
     max111x_init(dev, 4);
 }
 
-void max111x_set_input(DeviceState *dev, int line, uint8_t value)
-{
-    MAX111xState *s = MAX_111X(dev);
-    assert(line >= 0 && line < s->inputs);
-    s->input[line] = value;
-}
-
 static void max111x_reset(DeviceState *dev)
 {
     MAX111xState *s = MAX_111X(dev);
diff --git a/include/hw/ssi/ssi.h b/include/hw/ssi/ssi.h
index 4be5325e65..5fd411f2e4 100644
--- a/include/hw/ssi/ssi.h
+++ b/include/hw/ssi/ssi.h
@@ -111,7 +111,4 @@ SSIBus *ssi_create_bus(DeviceState *parent, const char *name);
 
 uint32_t ssi_transfer(SSIBus *bus, uint32_t val);
 
-/* max111x.c */
-void max111x_set_input(DeviceState *dev, int line, uint8_t value);
-
 #endif