port-mbim: allow specifying input subsystem

We have assumed until now that all MBIM ports are based on the
cdc_mbim driver, exposed in the 'usbmisc' subsystem by the cdc-wdm
driver.

This may no longer be true, so allow creating MBIM ports with
an explicit subsystem instead of defaulting always to USBMISC.

src/mm-base-modem.c

@@ -230,7 +230,7 @@ base_modem_create_usbmisc_port (MMBaseModem *self,
 #endif
 #if defined WITH_MBIM
     if (ptype == MM_PORT_TYPE_MBIM)
-        return MM_PORT (mm_port_mbim_new (name));
+        return MM_PORT (mm_port_mbim_new (name, MM_PORT_SUBSYS_USBMISC));
 #endif
     if (ptype == MM_PORT_TYPE_AT)
         return MM_PORT (mm_port_serial_at_new (name, MM_PORT_SUBSYS_USBMISC));

src/mm-port-mbim.c

@@ -589,11 +589,12 @@ mm_port_mbim_peek_device (MMPortMbim *self)
 /*****************************************************************************/
 
 MMPortMbim *
-mm_port_mbim_new (const gchar *name)
+mm_port_mbim_new (const gchar  *name,
+                  MMPortSubsys  subsys)
 {
     return MM_PORT_MBIM (g_object_new (MM_TYPE_PORT_MBIM,
                                        MM_PORT_DEVICE, name,
-                                       MM_PORT_SUBSYS, MM_PORT_SUBSYS_USBMISC,
+                                       MM_PORT_SUBSYS, subsys,
                                        MM_PORT_TYPE, MM_PORT_TYPE_MBIM,
                                        NULL));
 }

src/mm-port-mbim.h

@@ -53,7 +53,8 @@ struct _MMPortMbimClass {
 GType mm_port_mbim_get_type (void);
 G_DEFINE_AUTOPTR_CLEANUP_FUNC (MMPortMbim, g_object_unref)
 
-MMPortMbim *mm_port_mbim_new (const gchar *name);
+MMPortMbim *mm_port_mbim_new (const gchar  *name,
+                              MMPortSubsys  subsys);
 
 void     mm_port_mbim_open         (MMPortMbim *self,
 #if defined WITH_QMI && QMI_MBIM_QMUX_SUPPORTED

src/mm-port-probe.c

@@ -566,7 +566,8 @@ wdm_probe_mbim (MMPortProbe *self)
     mm_obj_dbg (self, "probing MBIM...");
 
     /* Create a port and try to open it */
-    ctx->mbim_port = mm_port_mbim_new (mm_kernel_device_get_name (self->priv->port));
+    ctx->mbim_port = mm_port_mbim_new (mm_kernel_device_get_name (self->priv->port),
+                                       MM_PORT_SUBSYS_USBMISC);
     mm_port_mbim_open (ctx->mbim_port,
 #if defined WITH_QMI && QMI_MBIM_QMUX_SUPPORTED
                        FALSE, /* Don't check QMI over MBIM support at this stage */