base: Add support for wwan subsystem

Add support for the Linux wwan subsystem that started to expose
control channel as character devices (e.g. /dev/wwan0p1MBIM...).

Signed-off-by: Loic Poulain <loic.poulain@linaro.org>

src/mm-base-modem.c

@@ -284,6 +284,30 @@ base_modem_create_qrtr_port (MMBaseModem    *self,
 }
 #endif
 
+static MMPort *
+base_modem_create_wwan_port (MMBaseModem *self,
+                             const gchar *name,
+                             MMPortType   ptype)
+{
+#if defined WITH_QMI
+    if (ptype == MM_PORT_TYPE_QMI)
+        return MM_PORT (mm_port_qmi_new (name, MM_PORT_SUBSYS_WWAN));
+#endif
+
+#if defined WITH_MBIM
+    if (ptype == MM_PORT_TYPE_MBIM)
+        return MM_PORT (mm_port_mbim_new (name, MM_PORT_SUBSYS_WWAN));
+#endif
+
+    if (ptype == MM_PORT_TYPE_QCDM)
+        return MM_PORT (mm_port_serial_qcdm_new (name, MM_PORT_SUBSYS_WWAN));
+
+    if (ptype == MM_PORT_TYPE_AT)
+        return MM_PORT (mm_port_serial_at_new (name, MM_PORT_SUBSYS_WWAN));
+
+    return NULL;
+}
+
 static MMPort *
 base_modem_create_virtual_port (MMBaseModem *self,
                                 const gchar *name)
@@ -334,6 +358,8 @@ base_modem_internal_grab_port (MMBaseModem         *self,
 #endif
     else if (g_str_equal (subsys, "virtual"))
         port = base_modem_create_virtual_port (self, name);
+    else if (g_str_equal (subsys, "wwan"))
+        port = base_modem_create_wwan_port (self, name, ptype);
 
     if (!port) {
         g_set_error (error, MM_CORE_ERROR, MM_CORE_ERROR_UNSUPPORTED,

src/mm-modem-helpers-qmi.c

@@ -1562,6 +1562,13 @@ mm_port_subsys_to_qmi_endpoint_type (MMPortSubsys subsys)
         case MM_PORT_SUBSYS_RPMSG:
         case MM_PORT_SUBSYS_QRTR:
             return QMI_DATA_ENDPOINT_TYPE_EMBEDDED;
+        /* The WWAN subsystem abstracts the underlying transport bus, and so
+         * endpoint type can not be deducted from that. This function should
+         * then be revisited, but in practice, only MHI/PCI modem ports are
+         * exposed through the WWAN subsystem for now.
+         */
+        case MM_PORT_SUBSYS_WWAN:
+            return QMI_DATA_ENDPOINT_TYPE_PCIE;
         case MM_PORT_SUBSYS_UNKNOWN:
         case MM_PORT_SUBSYS_TTY:
         case MM_PORT_SUBSYS_NET:

src/mm-plugin.c

@@ -786,6 +786,15 @@ mm_plugin_supports_port (MMPlugin            *self,
             probe_run_flags |= MM_PORT_PROBE_AT;
         if (self->priv->qmi)
             probe_run_flags |= MM_PORT_PROBE_QMI;
+    } else if (g_str_equal (mm_kernel_device_get_subsystem (port), "wwan")) {
+        if (self->priv->mbim)
+            probe_run_flags |= MM_PORT_PROBE_MBIM;
+        if (self->priv->qmi)
+            probe_run_flags |= MM_PORT_PROBE_QMI;
+        if (self->priv->qcdm)
+            probe_run_flags |= MM_PORT_PROBE_QCDM;
+        if (self->priv->at)
+            probe_run_flags |= MM_PORT_PROBE_AT;
     }
 #if defined WITH_QRTR
     else if (g_str_equal (mm_kernel_device_get_subsystem (port), "qrtr")) {

src/mm-port-probe.c

@@ -745,6 +745,8 @@ serial_probe_qcdm (MMPortProbe *self)
     gint                 len;
     guint8               marker = 0x7E;
     PortProbeRunContext *ctx;
+    MMPortSubsys subsys = MM_PORT_SUBSYS_TTY;
+
 
     g_assert (self->priv->task);
     ctx = g_task_get_task_data (self->priv->task);
@@ -767,8 +769,11 @@ serial_probe_qcdm (MMPortProbe *self)
         g_object_unref (ctx->serial);
     }
 
+    if (g_str_equal (mm_kernel_device_get_subsystem (self->priv->port), "wwan"))
+        subsys = MM_PORT_SUBSYS_WWAN;
+
     /* Open the QCDM port */
-    ctx->serial = MM_PORT_SERIAL (mm_port_serial_qcdm_new (mm_kernel_device_get_name (self->priv->port), MM_PORT_SUBSYS_TTY));
+    ctx->serial = MM_PORT_SERIAL (mm_port_serial_qcdm_new (mm_kernel_device_get_name (self->priv->port), subsys));
     if (!ctx->serial) {
         port_probe_task_return_error (self,
                                       g_error_new (MM_CORE_ERROR,
@@ -1296,6 +1301,8 @@ serial_open_at (MMPortProbe *self)
             subsys = MM_PORT_SUBSYS_USBMISC;
         else if (g_str_equal (mm_kernel_device_get_subsystem (self->priv->port), "rpmsg"))
             subsys = MM_PORT_SUBSYS_RPMSG;
+        else if (g_str_equal (mm_kernel_device_get_subsystem (self->priv->port), "wwan"))
+            subsys = MM_PORT_SUBSYS_WWAN;
 
         ctx->serial = MM_PORT_SERIAL (mm_port_serial_at_new (mm_kernel_device_get_name (self->priv->port), subsys));
         if (!ctx->serial) {

src/mm-port.h

@@ -30,7 +30,8 @@ typedef enum { /*< underscore_name=mm_port_subsys >*/
     MM_PORT_SUBSYS_UNIX,
     MM_PORT_SUBSYS_QRTR,
     MM_PORT_SUBSYS_RPMSG,
-    MM_PORT_SUBSYS_LAST = MM_PORT_SUBSYS_RPMSG /*< skip >*/
+    MM_PORT_SUBSYS_WWAN,
+    MM_PORT_SUBSYS_LAST = MM_PORT_SUBSYS_WWAN /*< skip >*/
 } MMPortSubsys;
 
 typedef enum { /*< underscore_name=mm_port_type >*/