gpio: cleanup of initial gpio work and add to CMakeLists.txt

Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

api/gpio.h

@@ -0,0 +1,43 @@
+/*
+ * Author: Thomas Ingleby <thomas.c.ingleby@intel.com>
+ *
+ * Copyright © 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.
+ */
+
+namespace maa {
+
+    struct gpio_t {
+        int pin;
+        int pinMap;
+        char path[32];
+    };
+    typedef char gpio_mode_t[8];
+    typedef char gpio_dir_t[8];
+
+    void gpio_init(gpio_t *gpio, int pin);
+    int gpio_set(int pin);
+    void gpio_mode(gpio_t *gpio, gpio_mode_t mode);
+    void gpio_dir(gpio_t *gpio, gpio_dir_t dir);
+
+    int gpio_read(gpio_t *gpio);
+    void gpio_write(gpio_t *gpio, int value);
+}