spi: Add initial SPI api

* Skeleton implementation included too.

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

src/spi/spi.c

@@ -0,0 +1,51 @@
+/*
+ * 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 "spi.h"
+
+maa_spi_context*
+maa_spi_init()
+{
+    return NULL;
+}
+
+maa_result_t
+maa_spi_mode(maa_spi_context* spi, unsigned short mode)
+{
+    return MAA_ERROR_FEATURE_NOT_IMPLEMENTED;
+}
+
+maa_result_t
+maa_spi_frequency(maa_spi_context* spi, int hz)
+{
+    return MAA_ERROR_FEATURE_NOT_IMPLEMENTED;
+}
+
+unsigned int
+maa_spi_write(maa_spi_context* spi, unsigned int data)
+{
+    return 0;
+}