qdev: gpio: Define qdev_pass_gpios()

Allows a container to take ownership of GPIOs in a contained
device and automatically connect them as GPIOs to the container.

This prepares for deprecation of the SYSBUS IRQ functionality, which
has this feature. We push it up to the device level instead of sysbus
level. There's nothing sysbus specific about passing GPIOs to
containers so its a legitimate device-level generic feature.

Reviewed-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/hw/core/qdev.c b/hw/core/qdev.c
index 31014e8769..c247fffd7f 100644
--- a/hw/core/qdev.c
+++ b/hw/core/qdev.c
@@ -483,6 +483,32 @@ void qdev_connect_gpio_out(DeviceState * dev, int n, qemu_irq pin)
     qdev_connect_gpio_out_named(dev, NULL, n, pin);
 }
 
+void qdev_pass_gpios(DeviceState *dev, DeviceState *container,
+                     const char *name)
+{
+    int i;
+    NamedGPIOList *ngl = qdev_get_named_gpio_list(dev, name);
+
+    for (i = 0; i < ngl->num_in; i++) {
+        const char *nm = ngl->name ? ngl->name : "unnamed-gpio-in";
+        char *propname = g_strdup_printf("%s[%d]", nm, i);
+
+        object_property_add_alias(OBJECT(container), propname,
+                                  OBJECT(dev), propname,
+                                  &error_abort);
+    }
+    for (i = 0; i < ngl->num_out; i++) {
+        const char *nm = ngl->name ? ngl->name : "unnamed-gpio-out";
+        char *propname = g_strdup_printf("%s[%d]", nm, i);
+
+        object_property_add_alias(OBJECT(container), propname,
+                                  OBJECT(dev), propname,
+                                  &error_abort);
+    }
+    QLIST_REMOVE(ngl, node);
+    QLIST_INSERT_HEAD(&container->gpios, ngl, node);
+}
+
 BusState *qdev_get_child_bus(DeviceState *dev, const char *name)
 {
     BusState *bus;