[Qemu-devel] [PULL 13/28] qdev: gpio: Define qdev_pass_gpios()

[Paolo Bonzini <pbonzini@redhat.com>]

From: Peter Crosthwaite <peter.crosthwaite@xilinx.com>

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>
---
 hw/core/qdev.c         | 26 ++++++++++++++++++++++++++
 include/hw/qdev-core.h |  3 +++
 2 files changed, 29 insertions(+)

diff --git a/hw/core/qdev.c b/hw/core/qdev.c
index 31014e8..c247fff 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;
diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h
index 86d341f..a7327fd 100644
--- a/include/hw/qdev-core.h
+++ b/include/hw/qdev-core.h
@@ -288,6 +288,9 @@ void qdev_init_gpio_in_named(DeviceState *dev, qemu_irq_handler handler,
 void qdev_init_gpio_out_named(DeviceState *dev, qemu_irq *pins,
                               const char *name, int n);
 
+void qdev_pass_gpios(DeviceState *dev, DeviceState *container,
+                     const char *name);
+
 BusState *qdev_get_parent_bus(DeviceState *dev);
 
 /*** BUS API. ***/
-- 
1.8.3.1