serial: allow spew control to be turned off

It's only used during probing where some port types (Sierra CnS
and some Icera devices) may send streams of data that we can't
understand until we close the port.  It interferes with some SMS
operations, so turn it off for ports opened after probing.

src/mm-plugin-base.c

@@ -872,6 +872,7 @@ mm_plugin_base_probe_port (MMPluginBase *self,
     g_object_set (serial,
                   MM_SERIAL_PORT_SEND_DELAY, send_delay_us,
                   MM_PORT_CARRIER_DETECT, FALSE,
+                  MM_SERIAL_PORT_SPEW_CONTROL, TRUE,
                   NULL);
 
     mm_at_serial_port_set_response_parser (serial,

src/mm-serial-port.c

@@ -44,6 +44,7 @@ enum {
     PROP_STOPBITS,
     PROP_SEND_DELAY,
     PROP_FD,
+    PROP_SPEW_CONTROL,
 
     LAST_PROP
 };
@@ -67,6 +68,7 @@ typedef struct {
     char parity;
     guint stopbits;
     guint64 send_delay;
+    gboolean spew_control;
 
     guint queue_id;
     guint watch_id;
@@ -657,7 +659,7 @@ data_available (GIOChannel *source,
         }
 
         /* Make sure the response doesn't grow too long */
-        if (priv->response->len > SERIAL_BUF_SIZE) {
+        if ((priv->response->len > SERIAL_BUF_SIZE) && priv->spew_control) {
             /* Notify listeners and then trim the buffer */
             g_signal_emit_by_name (self, "buffer-full", priv->response);
             g_byte_array_remove_range (priv->response, 0, (SERIAL_BUF_SIZE / 2));
@@ -1250,6 +1252,9 @@ set_property (GObject *object, guint prop_id,
     case PROP_SEND_DELAY:
         priv->send_delay = g_value_get_uint64 (value);
         break;
+    case PROP_SPEW_CONTROL:
+        priv->spew_control = g_value_get_boolean (value);
+        break;
     default:
         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
         break;
@@ -1281,6 +1286,9 @@ get_property (GObject *object, guint prop_id,
     case PROP_SEND_DELAY:
         g_value_set_uint64 (value, priv->send_delay);
         break;
+    case PROP_SPEW_CONTROL:
+        g_value_set_boolean (value, priv->spew_control);
+        break;
     default:
         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
         break;
@@ -1383,6 +1391,14 @@ mm_serial_port_class_init (MMSerialPortClass *klass)
                               0, G_MAXUINT64, 0,
                               G_PARAM_READWRITE));
 
+    g_object_class_install_property
+        (object_class, PROP_SPEW_CONTROL,
+         g_param_spec_boolean (MM_SERIAL_PORT_SPEW_CONTROL,
+                               "SpewControl",
+                               "Spew control",
+                               FALSE,
+                               G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE));
+
     /* Signals */
     g_signal_new ("buffer-full",
                   G_OBJECT_CLASS_TYPE (object_class),

src/mm-serial-port.h

@@ -36,6 +36,7 @@
 #define MM_SERIAL_PORT_STOPBITS     "stopbits"
 #define MM_SERIAL_PORT_SEND_DELAY   "send-delay"
 #define MM_SERIAL_PORT_FD           "fd" /* Construct-only */
+#define MM_SERIAL_PORT_SPEW_CONTROL "spew-control" /* Construct-only */
 
 typedef struct _MMSerialPort MMSerialPort;
 typedef struct _MMSerialPortClass MMSerialPortClass;