uart: barebones uart module added.

* Only defined call is the init. Will then expose the uart from
* the multiplexors.

Signed-off-by: Thomas Ingleby <thomas.c.ingleby@intel.com>

src/uart/uart.c

@@ -0,0 +1,54 @@
+/*
+ * Author: Thomas Ingleby <thomas.c.ingleby@intel.com>
+ * Copyright (c) 2014 Intel Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <string.h>
+
+#include "uart.h"
+#include "mraa_internal.h"
+
+/**
+ * A structure representing a UART device
+ */
+struct _uart {
+    /*@{*/
+    int index; /**< the uart index, as known to the os. */
+    /*@}*/
+};
+
+mraa_uart_context
+mraa_uart_init(int index)
+{
+    if ( mraa_setup_uart(index) != MRAA_SUCCESS)
+        return NULL;
+
+    mraa_uart_context dev = (mraa_uart_context) malloc(sizeof(struct _uart));
+    memset(dev, 0, sizeof(struct _uart));
+
+    dev->index = index;
+
+    return dev;
+}