option: disable preferred networks management in custom SIM object

It's been observed that running CPOL? would completely break the AT
port of the modules like the GIO225.

Fully disable this feature in the whole option and option-hso plugins,
by creating a new custom SIM object with the features disabled
completely, and setup as a new shared interface object.

Fixes https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/issues/404

1 files changed, 84 insertions, 0 deletions

diff --git a/plugins/option/mm-sim-option.c b/plugins/option/mm-sim-option.c
new file mode 100644
index 00000000..0871c4f2
--- /dev/null
+++ b/plugins/option/mm-sim-option.c
@@ -0,0 +1,84 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details:
+ *
+ * Copyright (C) 2021 Aleksander Morgado <aleksander@aleksander.es>
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <ctype.h>
+
+#include <ModemManager.h>
+#define _LIBMM_INSIDE_MM
+#include <libmm-glib.h>
+
+#include "mm-sim-option.h"
+
+G_DEFINE_TYPE (MMSimOption, mm_sim_option, MM_TYPE_BASE_SIM)
+
+/*****************************************************************************/
+
+MMBaseSim *
+mm_sim_option_new_finish (GAsyncResult  *res,
+                          GError       **error)
+{
+    GObject *source;
+    GObject *sim;
+
+    source = g_async_result_get_source_object (res);
+    sim = g_async_initable_new_finish (G_ASYNC_INITABLE (source), res, error);
+    g_object_unref (source);
+
+    if (!sim)
+        return NULL;
+
+    /* Only export valid SIMs */
+    mm_base_sim_export (MM_BASE_SIM (sim));
+
+    return MM_BASE_SIM (sim);
+}
+
+void
+mm_sim_option_new (MMBaseModem         *modem,
+                   GCancellable        *cancellable,
+                   GAsyncReadyCallback  callback,
+                   gpointer             user_data)
+{
+    g_async_initable_new_async (MM_TYPE_SIM_OPTION,
+                                G_PRIORITY_DEFAULT,
+                                cancellable,
+                                callback,
+                                user_data,
+                                MM_BASE_SIM_MODEM, modem,
+                                "active", TRUE, /* by default always active */
+                                NULL);
+}
+
+static void
+mm_sim_option_init (MMSimOption *self)
+{
+}
+
+static void
+mm_sim_option_class_init (MMSimOptionClass *klass)
+{
+    MMBaseSimClass *base_sim_class = MM_BASE_SIM_CLASS (klass);
+
+    /* Skip managing preferred networks, not supported by Option modems */
+    base_sim_class->load_preferred_networks = NULL;
+    base_sim_class->load_preferred_networks_finish = NULL;
+    base_sim_class->set_preferred_networks = NULL;
+    base_sim_class->set_preferred_networks_finish = NULL;
+}