plugin base: let plugins decide if they should be sorted last

Note that even if a plugin says it wants to be sorted last, the generic plugin
will always be the last one. Also, there is no order guaranteed between two
plugins that request to be sorted last.

src/mm-manager.c

@@ -113,7 +113,6 @@ load_plugin (const char *path)
     plugin = (*plugin_create_func) ();
     if (plugin) {
         g_object_weak_ref (G_OBJECT (plugin), (GWeakNotify) g_module_close, module);
-        mm_info ("Loaded plugin %s", mm_plugin_get_name (plugin));
     } else
         mm_warn ("Could not load plugin %s: initialization failed", path);
 
@@ -124,6 +123,31 @@ load_plugin (const char *path)
     return plugin;
 }
 
+static gint
+compare_plugins (const MMPlugin *plugin_a,
+                 const MMPlugin *plugin_b)
+{
+    /* The order of the plugins in the list is the same order used to check
+     * whether the plugin can manage a given modem:
+     *  - First, modems that will check vendor ID from udev.
+     *  - Then, modems that report to be sorted last (those which will check
+     *    vendor ID also from the probed ones..
+     */
+    if (mm_plugin_get_sort_last (plugin_a) &&
+        !mm_plugin_get_sort_last (plugin_b))
+        return 1;
+    if (!mm_plugin_get_sort_last (plugin_a) &&
+        mm_plugin_get_sort_last (plugin_b))
+        return -1;
+    return 0;
+}
+
+static void
+found_plugin (MMPlugin *plugin)
+{
+    mm_info ("Loaded plugin '%s'", mm_plugin_get_name (plugin));
+}
+
 static void
 load_plugins (MMManager *manager)
 {
@@ -162,10 +186,19 @@ load_plugins (MMManager *manager)
         }
     }
 
+    /* Sort last plugins that request it */
+    priv->plugins = g_slist_sort (priv->plugins, (GCompareFunc)compare_plugins);
+
     /* Make sure the generic plugin is last */
     if (generic_plugin)
         priv->plugins = g_slist_append (priv->plugins, generic_plugin);
 
+    /* Now report about all the found plugins, in the same order they will be
+     * used while checking support */
+    g_slist_foreach (priv->plugins, (GFunc)found_plugin, NULL);
+
+    mm_info ("Successfully loaded %u plugins", g_slist_length (priv->plugins));
+
     g_dir_close (dir);
 }
 
@@ -812,7 +845,7 @@ device_added (MMManager *manager, GUdevDevice *device)
         goto out;
     }
 
-    /* Success; now ask plugins if they can handle this port */    
+    /* Success; now ask plugins if they can handle this port */
     info = supports_info_new (manager, subsys, name, physdev_path);
     g_hash_table_insert (priv->supports, g_strdup (key), info);
 

src/mm-plugin-base.c

@@ -65,11 +65,13 @@ typedef struct {
     char *name;
     GUdevClient *client;
     GHashTable *tasks;
+    gboolean sort_last;
 } MMPluginBasePrivate;
 
 enum {
     PROP_0,
     PROP_NAME,
+    PROP_SORT_LAST,
     LAST_PROP
 };
 
@@ -1216,6 +1218,12 @@ get_name (MMPlugin *plugin)
     return MM_PLUGIN_BASE_GET_PRIVATE (plugin)->name;
 }
 
+static gboolean
+get_sort_last (const MMPlugin *plugin)
+{
+    return MM_PLUGIN_BASE_GET_PRIVATE (plugin)->sort_last;
+}
+
 static char *
 get_driver_name (GUdevDevice *device)
 {
@@ -1387,6 +1395,7 @@ plugin_init (MMPlugin *plugin_class)
 {
     /* interface implementation */
     plugin_class->get_name = get_name;
+    plugin_class->get_sort_last = get_sort_last;
     plugin_class->supports_port = supports_port;
     plugin_class->cancel_supports_port = cancel_supports_port;
     plugin_class->grab_port = grab_port;
@@ -1424,6 +1433,10 @@ set_property (GObject *object, guint prop_id,
         /* Construct only */
         priv->name = g_value_dup_string (value);
         break;
+    case PROP_SORT_LAST:
+        /* Construct only */
+        priv->sort_last = g_value_get_boolean (value);
+        break;
     default:
         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
         break;
@@ -1440,6 +1453,9 @@ get_property (GObject *object, guint prop_id,
     case PROP_NAME:
         g_value_set_string (value, priv->name);
         break;
+    case PROP_SORT_LAST:
+        g_value_set_boolean (value, priv->sort_last);
+        break;
     default:
         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
         break;
@@ -1482,6 +1498,15 @@ mm_plugin_base_class_init (MMPluginBaseClass *klass)
                               NULL,
                               G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
 
+    g_object_class_install_property
+        (object_class, PROP_SORT_LAST,
+         g_param_spec_boolean (MM_PLUGIN_BASE_SORT_LAST,
+                               "Sort Last",
+                               "Whether the plugin should be sorted last in the"
+                               "list of plugins loaded",
+                               FALSE,
+                               G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
+
     signals[PROBE_RESULT] =
         g_signal_new ("probe-result",
                       G_OBJECT_CLASS_TYPE (object_class),

src/mm-plugin-base.h

@@ -106,7 +106,8 @@ void mm_plugin_base_supports_task_add_custom_init_command (MMPluginBaseSupportsT
 #define MM_IS_PLUBIN_BASE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  MM_TYPE_PLUGIN_BASE))
 #define MM_PLUGIN_BASE_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  MM_TYPE_PLUGIN_BASE, MMPluginBaseClass))
 
-#define MM_PLUGIN_BASE_NAME "name"
+#define MM_PLUGIN_BASE_NAME      "name"
+#define MM_PLUGIN_BASE_SORT_LAST "sort-last"
 
 typedef struct _MMPluginBase MMPluginBase;
 typedef struct _MMPluginBaseClass MMPluginBaseClass;

src/mm-plugin.c

@@ -24,6 +24,14 @@ mm_plugin_get_name (MMPlugin *plugin)
     return MM_PLUGIN_GET_INTERFACE (plugin)->get_name (plugin);
 }
 
+gboolean
+mm_plugin_get_sort_last (const MMPlugin *plugin)
+{
+    g_return_val_if_fail (MM_IS_PLUGIN (plugin), FALSE);
+
+    return MM_PLUGIN_GET_INTERFACE (plugin)->get_sort_last (plugin);
+}
+
 MMPluginSupportsResult
 mm_plugin_supports_port (MMPlugin *plugin,
                          const char *subsys,
@@ -100,8 +108,8 @@ mm_plugin_get_type (void)
         };
 
         plugin_type = g_type_register_static (G_TYPE_INTERFACE,
-                                             "MMPlugin",
-                                             &plugin_info, 0);
+                                              "MMPlugin",
+                                              &plugin_info, 0);
 
         g_type_interface_add_prerequisite (plugin_type, G_TYPE_OBJECT);
     }

src/mm-plugin.h

@@ -54,9 +54,14 @@ typedef enum {
 struct _MMPlugin {
     GTypeInterface g_iface;
 
-    /* Methods */
+    /* Get plugin name */
     const char *(*get_name)   (MMPlugin *self);
 
+    /* Returns TRUE if the plugin should be sorted last in the list of plugins
+     * loaded. This is useful to indicate plugins that need an additional check
+     * on the probed vendor ID to see if they can support it. */
+    gboolean (*get_sort_last) (const MMPlugin *self);
+
     /* Check whether a plugin supports a particular modem port, and what level
      * of support the plugin has for the device.  If the plugin can immediately
      * determine whether a port is unsupported, it should return
@@ -104,6 +109,8 @@ GType mm_plugin_get_type (void);
 
 const char *mm_plugin_get_name   (MMPlugin *plugin);
 
+gboolean mm_plugin_get_sort_last (const MMPlugin *plugin);
+
 MMPluginSupportsResult mm_plugin_supports_port  (MMPlugin *plugin,
                                                  const char *subsys,
                                                  const char *name,