broadband-modem-mbim: allow subclassing the match of control vs net ports

By default we provide the implementation for the cdc_mbim driver,
where both control and net ports share the same USB interface.

src/mm-broadband-modem-mbim.c

@@ -254,19 +254,31 @@ mm_broadband_modem_mbim_get_port_mbim_for_data (MMBroadbandModemMbim  *self,
             NULL);
 }
 
-MMPortMbim *
-mm_broadband_modem_mbim_peek_port_mbim_for_data (MMBroadbandModemMbim  *self,
-                                                 MMPort                *data,
-                                                 GError               **error)
+static MMPortMbim *
+peek_port_mbim_for_data (MMBroadbandModemMbim  *self,
+                         MMPort                *data,
+                         GError               **error)
 {
     GList       *cdc_wdm_mbim_ports;
     GList       *l;
     const gchar *net_port_parent_path;
     MMPortMbim  *found = NULL;
+    const gchar *net_port_driver;
 
     g_assert (MM_IS_BROADBAND_MODEM_MBIM (self));
     g_assert (mm_port_get_subsys (data) == MM_PORT_SUBSYS_NET);
 
+    net_port_driver = mm_kernel_device_get_driver (mm_port_peek_kernel_device (data));
+    if (g_strcmp0 (net_port_driver, "cdc_mbim") != 0) {
+        g_set_error (error,
+                     MM_CORE_ERROR,
+                     MM_CORE_ERROR_FAILED,
+                     "Unsupported MBIM kernel driver for 'net/%s': %s",
+                     mm_port_get_device (data),
+                     net_port_driver);
+        return NULL;
+    }
+
     net_port_parent_path = mm_kernel_device_get_interface_sysfs_path (mm_port_peek_kernel_device (data));
     if (!net_port_parent_path) {
         g_set_error (error,
@@ -304,6 +316,16 @@ mm_broadband_modem_mbim_peek_port_mbim_for_data (MMBroadbandModemMbim  *self,
     return found;
 }
 
+MMPortMbim *
+mm_broadband_modem_mbim_peek_port_mbim_for_data (MMBroadbandModemMbim  *self,
+                                                 MMPort                *data,
+                                                 GError               **error)
+{
+    g_assert (MM_BROADBAND_MODEM_MBIM_GET_CLASS (self)->peek_port_mbim_for_data);
+
+    return MM_BROADBAND_MODEM_MBIM_GET_CLASS (self)->peek_port_mbim_for_data (self, data, error);
+}
+
 /*****************************************************************************/
 /* Current capabilities (Modem interface) */
 
@@ -5811,6 +5833,8 @@ mm_broadband_modem_mbim_class_init (MMBroadbandModemMbimClass *klass)
 
     g_type_class_add_private (object_class, sizeof (MMBroadbandModemMbimPrivate));
 
+    klass->peek_port_mbim_for_data = peek_port_mbim_for_data;
+
     object_class->dispose = dispose;
     object_class->finalize = finalize;
 

src/mm-broadband-modem-mbim.h

@@ -36,6 +36,10 @@ struct _MMBroadbandModemMbim {
 
 struct _MMBroadbandModemMbimClass{
     MMBroadbandModemClass parent;
+
+    MMPortMbim * (* peek_port_mbim_for_data) (MMBroadbandModemMbim  *self,
+                                              MMPort                *data,
+                                              GError               **error);
 };
 
 GType mm_broadband_modem_mbim_get_type (void);