Add support for Gemalto specific radio settings.

---
 Makefile.am                           |   1 +
 drivers/gemaltomodem/gemaltomodem.c   |   2 +
 drivers/gemaltomodem/gemaltomodem.h   |   3 +
 drivers/gemaltomodem/radio-settings.c | 267 ++++++++++++++++++++++++++
 4 files changed, 273 insertions(+)
 create mode 100644 drivers/gemaltomodem/radio-settings.c

diff --git a/Makefile.am b/Makefile.am
index 0159fcb0..6f6e71ee 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -487,6 +487,7 @@ builtin_sources += drivers/atmodem/atutil.h \
                        drivers/gemaltomodem/location-reporting.c \
                        drivers/gemaltomodem/voicecall.c \
                        drivers/gemaltomodem/gprs-context.c \
+                       drivers/gemaltomodem/radio-settings.c \
                        drivers/gemaltomodem/netmon.c
 
 builtin_modules += xmm7modem
diff --git a/drivers/gemaltomodem/gemaltomodem.c 
b/drivers/gemaltomodem/gemaltomodem.c
index f7e4ff3e..bcf37e5e 100644
--- a/drivers/gemaltomodem/gemaltomodem.c
+++ b/drivers/gemaltomodem/gemaltomodem.c
@@ -36,6 +36,7 @@
 static int gemaltomodem_init(void)
 {
        gemalto_location_reporting_init();
+       gemalto_radio_settings_init();
        gemalto_gprs_context_init();
        gemalto_voicecall_init();
        gemalto_netmon_init();
@@ -46,6 +47,7 @@ static int gemaltomodem_init(void)
 static void gemaltomodem_exit(void)
 {
        gemalto_location_reporting_exit();
+       gemalto_radio_settings_exit();
        gemalto_gprs_context_exit();
        gemalto_voicecall_exit();
        gemalto_netmon_exit();
diff --git a/drivers/gemaltomodem/gemaltomodem.h 
b/drivers/gemaltomodem/gemaltomodem.h
index ae8f2141..91a70baa 100644
--- a/drivers/gemaltomodem/gemaltomodem.h
+++ b/drivers/gemaltomodem/gemaltomodem.h
@@ -33,3 +33,6 @@ extern void gemalto_gprs_context_exit();
 
 extern void gemalto_netmon_init(void);
 extern void gemalto_netmon_exit(void);
+
+extern void gemalto_radio_settings_init(void);
+extern void gemalto_radio_settings_exit(void);
diff --git a/drivers/gemaltomodem/radio-settings.c 
b/drivers/gemaltomodem/radio-settings.c
new file mode 100644
index 00000000..d2de89cf
--- /dev/null
+++ b/drivers/gemaltomodem/radio-settings.c
@@ -0,0 +1,267 @@
+/*
+ *
+ *  oFono - Open Source Telephony
+ *
+ *  Copyright (C) 2017 Intel Corporation. All rights reserved.
+ *  Copyright (C) 2021 Sergey Matyukevich. All rights reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ *
+ *  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.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+
+#include <glib.h>
+
+#include <ofono/log.h>
+#include <ofono/modem.h>
+#include <ofono/radio-settings.h>
+
+#include "gatchat.h"
+#include "gatresult.h"
+
+#include "gemaltomodem.h"
+
+static const char *none_prefix[] = { NULL };
+static const char *sxrat_prefix[] = { "^SXRAT:", NULL };
+
+struct radio_settings_data {
+       GAtChat *chat;
+};
+
+static void sxrat_query_cb(gboolean ok, GAtResult *result, gpointer user_data)
+{
+       struct cb_data *cbd = user_data;
+       ofono_radio_settings_rat_mode_query_cb_t cb = cbd->cb;
+       enum ofono_radio_access_mode mode;
+       struct ofono_error error;
+       int value, pref1, pref2;
+       GAtResultIter iter;
+
+       DBG("ok %d", ok);
+
+       decode_at_error(&error, g_at_result_final_response(result));
+
+       if (!ok) {
+               cb(&error, -1, cbd->data);
+               return;
+       }
+
+       g_at_result_iter_init(&iter, result);
+
+       if (!g_at_result_iter_next(&iter, "^SXRAT:"))
+               goto error;
+
+       if (!g_at_result_iter_next_number(&iter, &value))
+               goto error;
+
+       g_at_result_iter_next_number_default(&iter, -1, &pref1);
+       g_at_result_iter_next_number_default(&iter, -1, &pref2);
+
+       DBG("mode %d pref1 %d pref2 %d", value, pref1, pref2);
+
+       switch (value) {
+       case 0:
+               mode = OFONO_RADIO_ACCESS_MODE_GSM;
+               break;
+       case 1:
+               mode = OFONO_RADIO_ACCESS_MODE_GSM |
+                       OFONO_RADIO_ACCESS_MODE_UMTS;
+               break;
+       case 2:
+               mode = OFONO_RADIO_ACCESS_MODE_UMTS;
+               break;
+       case 3:
+               mode = OFONO_RADIO_ACCESS_MODE_LTE;
+               break;
+       case 4:
+               mode = OFONO_RADIO_ACCESS_MODE_UMTS |
+                       OFONO_RADIO_ACCESS_MODE_LTE;
+               break;
+       case 5:
+               mode = OFONO_RADIO_ACCESS_MODE_GSM |
+                       OFONO_RADIO_ACCESS_MODE_LTE;
+               break;
+       case 6:
+               mode = OFONO_RADIO_ACCESS_MODE_ANY;
+               break;
+       default:
+               CALLBACK_WITH_FAILURE(cb, -1, cbd->data);
+               return;
+       }
+
+       cb(&error, mode, cbd->data);
+
+       return;
+
+error:
+       CALLBACK_WITH_FAILURE(cb, -1, cbd->data);
+}
+
+static void gemalto_query_rat_mode(struct ofono_radio_settings *rs,
+                               ofono_radio_settings_rat_mode_query_cb_t cb,
+                               void *data)
+{
+       struct radio_settings_data *rsd = ofono_radio_settings_get_data(rs);
+       struct cb_data *cbd = cb_data_new(cb, data);
+
+       DBG("");
+
+       if (g_at_chat_send(rsd->chat, "AT^SXRAT?", sxrat_prefix,
+                               sxrat_query_cb, cbd, g_free) == 0) {
+               CALLBACK_WITH_FAILURE(cb, -1, data);
+               g_free(cbd);
+       }
+}
+
+static void sxrat_modify_cb(gboolean ok, GAtResult *result, gpointer user_data)
+{
+       struct cb_data *cbd = user_data;
+       ofono_radio_settings_rat_mode_set_cb_t cb = cbd->cb;
+       struct ofono_error error;
+
+       DBG("ok %d", ok);
+
+       decode_at_error(&error, g_at_result_final_response(result));
+       cb(&error, cbd->data);
+}
+
+static void gemalto_set_rat_mode(struct ofono_radio_settings *rs,
+                               enum ofono_radio_access_mode m,
+                               ofono_radio_settings_rat_mode_set_cb_t cb,
+                               void *data)
+{
+       struct radio_settings_data *rsd = ofono_radio_settings_get_data(rs);
+       struct cb_data *cbd = cb_data_new(cb, data);
+       int val= 6, p1 = 3, p2 = 2;
+       char buf[20];
+
+       DBG("mode %d", m);
+
+       switch (m) {
+       case OFONO_RADIO_ACCESS_MODE_ANY:
+               val = 6;
+               p1 = 3;
+               p2 = 2;
+               break;
+       case OFONO_RADIO_ACCESS_MODE_GSM:
+               val = 0;
+               break;
+       case OFONO_RADIO_ACCESS_MODE_UMTS:
+               val = 2;
+               break;
+       case OFONO_RADIO_ACCESS_MODE_LTE:
+               val = 3;
+               break;
+       }
+
+       if (m == (OFONO_RADIO_ACCESS_MODE_UMTS|OFONO_RADIO_ACCESS_MODE_GSM)) {
+               val = 1;
+               p1 = 2;
+       }
+
+       if (m == (OFONO_RADIO_ACCESS_MODE_LTE|OFONO_RADIO_ACCESS_MODE_UMTS)) {
+               val = 4;
+               p1 = 3;
+       }
+
+       if (m == (OFONO_RADIO_ACCESS_MODE_LTE|OFONO_RADIO_ACCESS_MODE_GSM)) {
+               val = 5;
+               p1 = 3;
+       }
+
+       if (val == 6)
+               snprintf(buf, sizeof(buf), "AT^SXRAT=%u,%u,%u", val, p1, p2);
+       else if (val == 1 || val == 4 || val == 5)
+               snprintf(buf, sizeof(buf), "AT^SXRAT=%u,%u", val, p1);
+       else
+               snprintf(buf, sizeof(buf), "AT^SXRAT=%u", val);
+
+       if (g_at_chat_send(rsd->chat, buf, none_prefix,
+                               sxrat_modify_cb, cbd, g_free) > 0)
+               return;
+
+       CALLBACK_WITH_FAILURE(cb, data);
+       g_free(cbd);
+}
+
+static void sxrat_support_cb(gboolean ok, GAtResult *result, gpointer 
user_data)
+{
+       struct ofono_radio_settings *rs = user_data;
+
+       DBG("ok %d", ok);
+
+       if (!ok) {
+               ofono_radio_settings_remove(rs);
+               return;
+       }
+
+       ofono_radio_settings_register(rs);
+}
+
+static int gemalto_radio_settings_probe(struct ofono_radio_settings *rs,
+                                       unsigned int vendor, void *data)
+{
+       GAtChat *chat = data;
+       struct radio_settings_data *rsd;
+
+       DBG("");
+
+       rsd = g_new0(struct radio_settings_data, 1);
+
+       rsd->chat = g_at_chat_clone(chat);
+
+       ofono_radio_settings_set_data(rs, rsd);
+
+       g_at_chat_send(rsd->chat, "AT^SXRAT=?", sxrat_prefix,
+                       sxrat_support_cb, rs, NULL);
+
+       return 0;
+}
+
+static void gemalto_radio_settings_remove(struct ofono_radio_settings *rs)
+{
+       struct radio_settings_data *rsd = ofono_radio_settings_get_data(rs);
+
+       DBG("");
+
+       ofono_radio_settings_set_data(rs, NULL);
+       g_at_chat_unref(rsd->chat);
+       g_free(rsd);
+}
+
+static const struct ofono_radio_settings_driver driver = {
+       .name                   = "gemaltomodem",
+       .probe                  = gemalto_radio_settings_probe,
+       .remove                 = gemalto_radio_settings_remove,
+       .query_rat_mode         = gemalto_query_rat_mode,
+       .set_rat_mode           = gemalto_set_rat_mode
+};
+
+void gemalto_radio_settings_init(void)
+{
+       ofono_radio_settings_driver_register(&driver);
+}
+
+void gemalto_radio_settings_exit(void)
+{
+       ofono_radio_settings_driver_unregister(&driver);
+}
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