plugin-base: new 'allowed-udev-tags' property

The plugins can set this property to filter support check requests by the
availability of a given udev tag in the port. The value given to the property
should be a NULL-terminated array of C strings, e.g.:

    const gchar *tags[] = { "ID_MM_X22X_TAGGED", NULL };

src/mm-plugin-base.c

@@ -77,6 +77,7 @@ typedef struct {
     const guint16 *product_ids;
     const gchar **vendor_strings;
     const gchar **product_strings;
+    const gchar **udev_tags;
     gboolean qcdm;
     const MMPortProbeAtCommand *custom_init;
     guint64 send_delay;
@@ -92,6 +93,7 @@ enum {
     PROP_ALLOWED_PRODUCT_IDS,
     PROP_ALLOWED_VENDOR_STRINGS,
     PROP_ALLOWED_PRODUCT_STRINGS,
+    PROP_ALLOWED_UDEV_TAGS,
     PROP_ALLOWED_QCDM,
     PROP_CUSTOM_INIT,
     PROP_SEND_DELAY,
@@ -1597,6 +1599,10 @@ set_property (GObject *object, guint prop_id,
         /* Construct only */
         priv->product_strings = (const gchar **)g_value_get_pointer (value);
         break;
+    case PROP_ALLOWED_UDEV_TAGS:
+        /* Construct only */
+        priv->udev_tags = (const gchar **)g_value_get_pointer (value);
+        break;
     case PROP_ALLOWED_QCDM:
         /* Construct only */
         priv->qcdm = g_value_get_boolean (value);
@@ -1653,6 +1659,9 @@ get_property (GObject *object, guint prop_id,
     case PROP_ALLOWED_QCDM:
         g_value_set_boolean (value, priv->qcdm);
         break;
+    case PROP_ALLOWED_UDEV_TAGS:
+        g_value_set_pointer (value, (gpointer)priv->udev_tags);
+        break;
     case PROP_CUSTOM_INIT:
         g_value_set_pointer (value, (gpointer)priv->custom_init);
         break;
@@ -1761,6 +1770,14 @@ mm_plugin_base_class_init (MMPluginBaseClass *klass)
                                "should be an array of strings finished with 'NULL'",
                                G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
 
+    g_object_class_install_property
+        (object_class, PROP_ALLOWED_UDEV_TAGS,
+         g_param_spec_pointer (MM_PLUGIN_BASE_ALLOWED_UDEV_TAGS,
+                               "Allowed Udev tags",
+                               "List of udev tags this plugin may expect, "
+                               "should be an array of strings finished with 'NULL'",
+                               G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
+
     g_object_class_install_property
         (object_class, PROP_ALLOWED_QCDM,
          g_param_spec_boolean (MM_PLUGIN_BASE_ALLOWED_QCDM,

src/mm-plugin-base.h

@@ -131,6 +131,7 @@ typedef struct {
 #define MM_PLUGIN_BASE_ALLOWED_PRODUCT_IDS     "allowed-product-ids"
 #define MM_PLUGIN_BASE_ALLOWED_VENDOR_STRINGS  "allowed-vendor-strings"
 #define MM_PLUGIN_BASE_ALLOWED_PRODUCT_STRINGS "allowed-product-strings"
+#define MM_PLUGIN_BASE_ALLOWED_UDEV_TAGS       "allowed-udev-tags"
 #define MM_PLUGIN_BASE_ALLOWED_QCDM            "allowed-qcdm"
 #define MM_PLUGIN_BASE_CUSTOM_INIT             "custom-init"
 #define MM_PLUGIN_BASE_SEND_DELAY              "send-delay"