serial-port: new method to reopen a port

We will fully close the port and the re-open it again keeping the same
open_count that we had before.

src/mm-serial-port.c

@@ -1205,6 +1205,36 @@ mm_serial_port_queue_command_cached (MMSerialPort *self,
     internal_queue_command (self, command, take_command, TRUE, timeout_seconds, cancellable, callback, user_data);
 }
 
+gboolean
+mm_serial_port_reopen (MMSerialPort *self,
+                       GError **error)
+{
+    MMSerialPortPrivate *priv;
+    guint initial_open_count;
+    guint i;
+
+    g_return_val_if_fail (MM_IS_SERIAL_PORT (self), FALSE);
+
+    priv = MM_SERIAL_PORT_GET_PRIVATE (self);
+    initial_open_count = priv->open_count;
+
+    mm_dbg ("(%s) reopening port (%u)",
+            mm_port_get_device (MM_PORT (self)),
+            initial_open_count);
+
+    for (i = 0; i < initial_open_count; i++)
+        mm_serial_port_close (self);
+
+    for (i = 0; i < initial_open_count; i++) {
+        if (!mm_serial_port_open (self, error)) {
+            g_prefix_error (error, "Couldn't reopen port (%u): ", i);
+            return FALSE;
+        }
+    }
+
+    return TRUE;
+}
+
 static gboolean
 get_speed (MMSerialPort *self, speed_t *speed, GError **error)
 {
@@ -1676,7 +1706,7 @@ mm_serial_port_class_init (MMSerialPortClass *klass)
     g_object_class_install_property
         (object_class, PROP_FLASH_OK,
          g_param_spec_boolean (MM_SERIAL_PORT_FLASH_OK,
-                               "FlaskOk",
+                               "FlashOk",
                                "Flashing the port (0 baud for a short period) "
                                "is allowed.",
                                TRUE,

src/mm-serial-port.h

@@ -39,6 +39,7 @@
 #define MM_SERIAL_PORT_FD           "fd" /* Construct-only */
 #define MM_SERIAL_PORT_SPEW_CONTROL "spew-control" /* Construct-only */
 #define MM_SERIAL_PORT_FLASH_OK     "flash-ok" /* Construct-only */
+#define MM_SERIAL_PORT_FLASH_REOPEN "flash-reopen" /* Construct-only */
 
 typedef struct _MMSerialPort MMSerialPort;
 typedef struct _MMSerialPortClass MMSerialPortClass;
@@ -122,6 +123,9 @@ gboolean mm_serial_port_open              (MMSerialPort *self,
 
 void     mm_serial_port_close             (MMSerialPort *self);
 
+gboolean mm_serial_port_reopen            (MMSerialPort *self,
+                                           GError **error);
+
 gboolean mm_serial_port_flash             (MMSerialPort *self,
                                            guint32 flash_time,
                                            gboolean ignore_errors,