broadband-modem: implement the Signal interface

Provide a generic +CESQ based implementation for the extended Signal interface,
applicable to all AT-based modems.

We explicitly disable this check in MBIM modems.

src/mm-broadband-modem-mbim.c

@@ -36,20 +36,23 @@
 #include "mm-iface-modem.h"
 #include "mm-iface-modem-3gpp.h"
 #include "mm-iface-modem-messaging.h"
+#include "mm-iface-modem-signal.h"
 #include "mm-sms-part-3gpp.h"
 
 #if defined WITH_QMI
 # include <libqmi-glib.h>
 #endif
 
-static void iface_modem_init (MMIfaceModem *iface);
+static void iface_modem_init           (MMIfaceModem          *iface);
-static void iface_modem_3gpp_init (MMIfaceModem3gpp *iface);
+static void iface_modem_3gpp_init      (MMIfaceModem3gpp      *iface);
 static void iface_modem_messaging_init (MMIfaceModemMessaging *iface);
+static void iface_modem_signal_init    (MMIfaceModemSignal    *iface);
 
 G_DEFINE_TYPE_EXTENDED (MMBroadbandModemMbim, mm_broadband_modem_mbim, MM_TYPE_BROADBAND_MODEM, 0,
                         G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM, iface_modem_init)
                         G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM_3GPP, iface_modem_3gpp_init)
-                        G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM_MESSAGING, iface_modem_messaging_init))
+                        G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM_MESSAGING, iface_modem_messaging_init)
+                        G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM_SIGNAL, iface_modem_signal_init))
 
 typedef enum {
     PROCESS_NOTIFICATION_FLAG_NONE                 = 0,
@@ -3306,6 +3309,15 @@ iface_modem_messaging_init (MMIfaceModemMessaging *iface)
     iface->create_sms = messaging_create_sms;
 }
 
+static void
+iface_modem_signal_init (MMIfaceModemSignal *iface)
+{
+    iface->check_support = NULL;
+    iface->check_support_finish = NULL;
+    iface->load_values = NULL;
+    iface->load_values_finish = NULL;
+}
+
 static void
 mm_broadband_modem_mbim_class_init (MMBroadbandModemMbimClass *klass)
 {

src/mm-broadband-modem.c

@@ -8261,6 +8261,71 @@ modem_time_check_support (MMIfaceModemTime *self,
                                user_data);
 }
 
+/*****************************************************************************/
+/* Check support (Signal interface) */
+
+static gboolean
+modem_signal_check_support_finish (MMIfaceModemSignal  *self,
+                                   GAsyncResult        *res,
+                                   GError             **error)
+{
+    return !!mm_base_modem_at_command_finish (MM_BASE_MODEM (self), res, error);
+}
+
+static void
+modem_signal_check_support (MMIfaceModemSignal  *self,
+                            GAsyncReadyCallback  callback,
+                            gpointer             user_data)
+{
+    mm_base_modem_at_command (MM_BASE_MODEM (self),
+                              "+CESQ=?",
+                              3,
+                              TRUE,
+                              callback,
+                              user_data);
+}
+
+/*****************************************************************************/
+/* Load extended signal information (Signal interface) */
+
+static gboolean
+modem_signal_load_values_finish (MMIfaceModemSignal  *self,
+                                 GAsyncResult        *res,
+                                 MMSignal           **cdma,
+                                 MMSignal           **evdo,
+                                 MMSignal           **gsm,
+                                 MMSignal           **umts,
+                                 MMSignal           **lte,
+                                 GError             **error)
+{
+    const gchar *response;
+
+    response = mm_base_modem_at_command_finish (MM_BASE_MODEM (self), res, error);
+    if (!response || !mm_3gpp_cesq_response_to_signal_info (response, gsm, umts, lte, error))
+        return FALSE;
+
+    /* No 3GPP2 support */
+    if (cdma)
+        *cdma = NULL;
+    if (evdo)
+        *evdo = NULL;
+    return TRUE;
+}
+
+static void
+modem_signal_load_values (MMIfaceModemSignal  *self,
+                          GCancellable        *cancellable,
+                          GAsyncReadyCallback  callback,
+                          gpointer             user_data)
+{
+    mm_base_modem_at_command (MM_BASE_MODEM (self),
+                              "+CESQ",
+                              3,
+                              TRUE,
+                              callback,
+                              user_data);
+}
+
 /*****************************************************************************/
 
 static const gchar *primary_init_sequence[] = {
@@ -10830,6 +10895,10 @@ iface_modem_time_init (MMIfaceModemTime *iface)
 static void
 iface_modem_signal_init (MMIfaceModemSignal *iface)
 {
+    iface->check_support        = modem_signal_check_support;
+    iface->check_support_finish = modem_signal_check_support_finish;
+    iface->load_values          = modem_signal_load_values;
+    iface->load_values_finish   = modem_signal_load_values_finish;
 }
 
 static void