broadband-modem: implement HangupAll() with +CHUP

src/mm-broadband-modem.c

@@ -7718,6 +7718,30 @@ modem_voice_hangup_and_accept (MMIfaceModemVoice   *self,
                               user_data);
 }
 
+/*****************************************************************************/
+/* Hangup all (Voice interface) */
+
+static gboolean
+modem_voice_hangup_all_finish (MMIfaceModemVoice  *self,
+                               GAsyncResult       *res,
+                               GError            **error)
+{
+    return !!mm_base_modem_at_command_finish (MM_BASE_MODEM (self), res, error);
+}
+
+static void
+modem_voice_hangup_all (MMIfaceModemVoice   *self,
+                        GAsyncReadyCallback  callback,
+                        gpointer             user_data)
+{
+    mm_base_modem_at_command (MM_BASE_MODEM (self),
+                              "+CHUP",
+                              3,
+                              FALSE,
+                              callback,
+                              user_data);
+}
+
 /*****************************************************************************/
 /* ESN loading (CDMA interface) */
 
@@ -11944,6 +11968,8 @@ iface_modem_voice_init (MMIfaceModemVoice *iface)
     iface->hold_and_accept_finish = modem_voice_hold_and_accept_finish;
     iface->hangup_and_accept = modem_voice_hangup_and_accept;
     iface->hangup_and_accept_finish = modem_voice_hangup_and_accept_finish;
+    iface->hangup_all = modem_voice_hangup_all;
+    iface->hangup_all_finish = modem_voice_hangup_all_finish;
 }
 
 static void