qdev: add a qdev_get_type() function and expose as a 'type' property

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

hw/qdev.c

@@ -110,6 +110,8 @@ static DeviceState *qdev_create_from_info(BusState *bus, DeviceInfo *info)
         qdev_property_add_legacy(dev, prop, NULL);
     }
 
+    qdev_property_add_str(dev, "type", qdev_get_type, NULL, NULL);
+
     return dev;
 }
 
@@ -1031,6 +1033,11 @@ char* qdev_get_fw_dev_path(DeviceState *dev)
     return strdup(path);
 }
 
+char *qdev_get_type(DeviceState *dev, Error **errp)
+{
+    return g_strdup(dev->info->name);
+}
+
 void qdev_ref(DeviceState *dev)
 {
     dev->ref++;

hw/qdev.h

@@ -596,4 +596,18 @@ void qdev_property_add_str(DeviceState *dev, const char *name,
                            void (*set)(DeviceState *, const char *, Error **),
                            Error **errp);
 
+/**
+ * @qdev_get_type
+ *
+ * Returns the string representation of the type of this object.
+ *
+ * @dev - the device
+ *
+ * @errp - if an error occurs, a pointer to an area to store the error
+ *
+ * Returns: a string representing the type.  This must be freed by the caller
+ *          with g_free().
+ */
+char *qdev_get_type(DeviceState *dev, Error **errp);
+
 #endif