Add g_usb_device_get_parent()

This allows us to create something more than a flat list of devices.

2 files changed, 23 insertions, 0 deletions

diff --git a/gusb/gusb-device.c b/gusb/gusb-device.c
index 45e2623..2a1474d 100644
--- a/gusb/gusb-device.c
+++ b/gusb/gusb-device.c
@@ -70,6 +70,28 @@ G_DEFINE_TYPE_WITH_CODE (GUsbDevice, g_usb_device, G_TYPE_OBJECT,
                                                 g_usb_device_initable_iface_init))
 
 /**
+ * g_usb_device_get_parent:
+ * @device: a #GUsbDevice instance
+ *
+ * Gets the device parent if one exists.
+ *
+ * Return value: (transfer full): #GUsbDevice or %NULL
+ **/
+GUsbDevice *
+g_usb_device_get_parent (GUsbDevice *device)
+{
+	GUsbDevicePrivate *priv = device->priv;
+	libusb_device *parent;
+	parent = libusb_get_parent (priv->device);
+	if (parent == NULL)
+		return NULL;
+	return g_usb_context_find_by_bus_address (priv->context,
+						  libusb_get_bus_number (parent),
+						  libusb_get_device_address (parent),
+						  NULL);
+}
+
+/**
  * g_usb_device_error_quark:
  *
  * Return value: Our personal error quark.
diff --git a/gusb/gusb-device.h b/gusb/gusb-device.h
index e72dd53..c738a26 100644
--- a/gusb/gusb-device.h
+++ b/gusb/gusb-device.h
@@ -121,6 +121,7 @@ GType			 g_usb_device_get_type		(void);
 GQuark			 g_usb_device_error_quark	(void);
 
 const gchar		*g_usb_device_get_platform_id	(GUsbDevice	*device);
+GUsbDevice		*g_usb_device_get_parent	(GUsbDevice	*device);
 
 guint8			 g_usb_device_get_bus		(GUsbDevice	*device);
 guint8			 g_usb_device_get_address	(GUsbDevice	*device);