water: add C driver and example. C++ wraps C driver.

Signed-off-by: Jon Trulson <jtrulson@ics.com>

src/water/water_fti.c

@@ -0,0 +1,82 @@
+/*
+ * Author: Jon Trulson <jtrulson@ics.com>
+ * Copyright (c) 2016 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 "water.h"
+#include "upm_fti.h"
+
+/**
+ * This file implements the Function Table Interface (FTI) for this sensor
+ */
+
+const char upm_water_name[] = "water";
+const char upm_water_description[] = "Water presence sensor";
+const upm_protocol_t upm_water_protocol[] = {UPM_GPIO};
+const upm_sensor_t upm_water_category[] = {UPM_BINARY};
+
+// forward declarations
+const void* upm_water_get_ft(upm_sensor_t sensor_type);
+void* upm_water_init_name();
+void upm_water_close(void *dev);
+upm_result_t upm_water_is_wet(void *dev, bool *value);
+
+static const upm_sensor_ft ft =
+{
+  .upm_sensor_init_name = upm_water_init_name,
+  .upm_sensor_close = upm_water_close,
+};
+
+static const upm_binary_ft bft =
+{
+  .upm_binary_get_value = upm_water_is_wet,
+};
+
+const void* upm_water_get_ft(upm_sensor_t sensor_type)
+{
+  switch(sensor_type)
+    {
+    case UPM_SENSOR:
+      return &ft;
+    case UPM_BINARY:
+      return &bft;
+    default:
+      return NULL;
+    }
+}
+
+void *upm_water_init_name()
+{
+  return NULL;
+}
+
+void upm_water_close(void *dev)
+{
+  water_close((water_context)dev);
+}
+
+upm_result_t upm_water_is_wet(void *dev, bool *value)
+{
+  *value = water_is_wet((water_context)dev);
+
+  return UPM_SUCCESS;
+}