libqmi-glib,device: new method to list available links

This generic method allows us to list all links that have been created
from a base parent interface. The implementation is common for both
rmnet and qmiwwan backends, based on the "upper" links in sysfs.

4 files changed, 73 insertions, 0 deletions

diff --git a/src/libqmi-glib/qmi-device.c b/src/libqmi-glib/qmi-device.c
index 3a6bd83..6b0154d 100644
--- a/src/libqmi-glib/qmi-device.c
+++ b/src/libqmi-glib/qmi-device.c
@@ -1933,6 +1933,24 @@ qmi_device_delete_link (QmiDevice           *self,
 /*****************************************************************************/
 
 gboolean
+qmi_device_list_links (QmiDevice    *self,
+                       const gchar  *base_ifname,
+                       GPtrArray   **out_links,
+                       GError      **error)
+{
+    if (!setup_net_port_manager (self, error))
+        return FALSE;
+
+    g_assert (self->priv->net_port_manager);
+    return qmi_net_port_manager_list_links (self->priv->net_port_manager,
+                                            base_ifname,
+                                            out_links,
+                                            error);
+}
+
+/*****************************************************************************/
+
+gboolean
 qmi_device_check_link_supported (QmiDevice  *self,
                                  GError    **error)
 {
diff --git a/src/libqmi-glib/qmi-device.h b/src/libqmi-glib/qmi-device.h
index 602390c..2c3894f 100644
--- a/src/libqmi-glib/qmi-device.h
+++ b/src/libqmi-glib/qmi-device.h
@@ -999,6 +999,23 @@ gboolean qmi_device_delete_link_finish (QmiDevice     *self,
                                         GError       **error);
 
 /**
+ * qmi_device_list_links:
+ * @self: a #QmiDevice.
+ * @base_ifname: the base interface.
+ * @out_links: (out)(transfer full)(element-type utf8): a placeholder for the
+ *   output #GPtrArray of link names.
+ * @error: Return location for error or %NULL.
+ *
+ * Returns: %TRUE if successful, %FALSE if @error is set.
+ *
+ * Since: 1.28
+ */
+gboolean qmi_device_list_links (QmiDevice    *self,
+                                const gchar  *base_ifname,
+                                GPtrArray   **out_links,
+                                GError      **error);
+
+/**
  * qmi_device_check_link_supported:
  * @self: a #QmiDevice.
  * @error: Return location for error or %NULL.
diff --git a/src/libqmi-glib/qmi-net-port-manager.c b/src/libqmi-glib/qmi-net-port-manager.c
index abfd56c..7e01879 100644
--- a/src/libqmi-glib/qmi-net-port-manager.c
+++ b/src/libqmi-glib/qmi-net-port-manager.c
@@ -21,6 +21,7 @@
  */
 
 #include "qmi-net-port-manager.h"
+#include "qmi-helpers.h"
 
 G_DEFINE_ABSTRACT_TYPE (QmiNetPortManager, qmi_net_port_manager, G_TYPE_OBJECT)
 
@@ -81,6 +82,33 @@ qmi_net_port_manager_del_link_finish (QmiNetPortManager  *self,
     return QMI_NET_PORT_MANAGER_GET_CLASS (self)->del_link_finish (self, res, error);
 }
 
+gboolean
+qmi_net_port_manager_list_links (QmiNetPortManager  *self,
+                                 const gchar        *base_ifname,
+                                 GPtrArray         **out_links,
+                                 GError            **error)
+{
+    return QMI_NET_PORT_MANAGER_GET_CLASS (self)->list_links (self, base_ifname, out_links, error);
+}
+
+/*****************************************************************************/
+/* Default implementations */
+
+static gboolean
+net_port_manager_list_links (QmiNetPortManager  *self,
+                             const gchar        *base_ifname,
+                             GPtrArray         **out_links,
+                             GError            **error)
+{
+    g_autoptr(GFile)  sysfs_file = NULL;
+    g_autofree gchar *sysfs_path = NULL;
+
+    sysfs_path = g_strdup_printf ("/sys/class/net/%s", base_ifname);
+    sysfs_file = g_file_new_for_path (sysfs_path);
+
+    return qmi_helpers_list_links (sysfs_file, NULL, NULL, out_links, error);
+}
+
 /*****************************************************************************/
 
 static void
@@ -91,4 +119,5 @@ qmi_net_port_manager_init (QmiNetPortManager *self)
 static void
 qmi_net_port_manager_class_init (QmiNetPortManagerClass *klass)
 {
+    klass->list_links = net_port_manager_list_links;
 }
diff --git a/src/libqmi-glib/qmi-net-port-manager.h b/src/libqmi-glib/qmi-net-port-manager.h
index 100f2ee..3783745 100644
--- a/src/libqmi-glib/qmi-net-port-manager.h
+++ b/src/libqmi-glib/qmi-net-port-manager.h
@@ -45,6 +45,11 @@ struct _QmiNetPortManager {
 struct _QmiNetPortManagerClass {
     GObjectClass parent;
 
+    gboolean (* list_links)      (QmiNetPortManager    *self,
+                                  const gchar          *base_ifname,
+                                  GPtrArray           **out_links,
+                                  GError              **error);
+
     void     (* add_link)        (QmiNetPortManager    *self,
                                   guint                 mux_id,
                                   const gchar          *base_ifname,
@@ -73,6 +78,10 @@ struct _QmiNetPortManagerClass {
 GType qmi_net_port_manager_get_type (void);
 G_DEFINE_AUTOPTR_CLEANUP_FUNC (QmiNetPortManager, g_object_unref)
 
+gboolean  qmi_net_port_manager_list_links      (QmiNetPortManager    *self,
+                                                const gchar          *base_ifname,
+                                                GPtrArray           **out_links,
+                                                GError              **error);
 
 void      qmi_net_port_manager_add_link        (QmiNetPortManager    *self,
                                                 guint                 mux_id,