manager: new ScanDevices() d-bus method to request a new device scan loop

introspection/org.freedesktop.ModemManager.xml

@@ -2,6 +2,7 @@
 
 <node name="/" xmlns:tp="http://telepathy.freedesktop.org/wiki/DbusSpec#extensions-v0">
   <interface name="org.freedesktop.ModemManager">
+
     <method name="EnumerateDevices">
       <tp:docstring>
         Get the list of modem devices.
@@ -14,6 +15,13 @@
       </arg>
     </method>
 
+    <method name="ScanDevices">
+      <tp:docstring>
+        Start a new scan for connected modem devices.
+      </tp:docstring>
+      <annotation name="org.freedesktop.DBus.GLib.CSymbol" value="impl_manager_scan_devices"/>
+    </method>
+
     <signal name="DeviceAdded">
       <tp:docstring>
         A device was added to the system.

src/mm-manager.c

@@ -30,6 +30,8 @@ static gboolean impl_manager_enumerate_devices (MMManager *manager,
                                                 GPtrArray **devices,
                                                 GError **err);
 
+static gboolean impl_manager_scan_devices (MMManager *manager);
+
 #include "mm-manager-glue.h"
 
 G_DEFINE_TYPE (MMManager, mm_manager, G_TYPE_OBJECT)
@@ -951,6 +953,14 @@ handle_uevent (GUdevClient *client,
 		device_removed (self, device);
 }
 
+static gboolean
+impl_manager_scan_devices (MMManager *manager)
+{
+    /* Relaunch manager start, which does device scanning */
+    mm_manager_start (manager);
+    return TRUE;
+}
+
 void
 mm_manager_start (MMManager *manager)
 {
@@ -960,6 +970,8 @@ mm_manager_start (MMManager *manager)
     g_return_if_fail (manager != NULL);
     g_return_if_fail (MM_IS_MANAGER (manager));
 
+    mm_dbg ("Starting device scan...");
+
     priv = MM_MANAGER_GET_PRIVATE (manager);
 
     devices = g_udev_client_query_by_subsystem (priv->udev, "tty");
@@ -975,6 +987,8 @@ mm_manager_start (MMManager *manager)
         g_object_unref (G_OBJECT (iter->data));
     }
     g_list_free (devices);
+
+    mm_dbg ("Finished device scan...");
 }
 
 typedef struct {