rotaryencoder: add C driver and example; FTI; C++ wraps C

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

src/rotaryencoder/rotaryencoder_fti.c

@@ -0,0 +1,106 @@
+/*
+ * 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 "rotaryencoder.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "upm_fti.h"
+#include "upm_sensor.h"
+
+/**
+ * This file implements the Function Table Interface (FTI) for this sensor
+ */
+
+const char upm_rotaryencoder_name[] = "ROTARYENCODER";
+const char upm_rotaryencoder_description[] = "Rotary Encoder";
+const upm_protocol_t upm_rotaryencoder_protocol[] = {UPM_GPIO, UPM_GPIO};
+const upm_sensor_t upm_rotaryencoder_category[] = {UPM_ROTARYENCODER};
+
+// forward declarations
+const upm_sensor_descriptor_t upm_rotaryencoder_get_descriptor();
+const void* upm_rotaryencoder_get_ft(upm_sensor_t sensor_type);
+void* upm_rotaryencoder_init_name();
+void upm_rotaryencoder_close(void* dev);
+upm_result_t upm_rotaryencoder_get_pos(const void* dev, int *pos);
+upm_result_t upm_rotaryencoder_set_pos(const void* dev, int pos);
+
+const upm_sensor_descriptor_t upm_rotaryencoder_get_descriptor()
+{
+    upm_sensor_descriptor_t usd;
+    usd.name = upm_rotaryencoder_name;
+    usd.description = upm_rotaryencoder_description;
+    usd.protocol_size = 2;
+    usd.protocol = upm_rotaryencoder_protocol;
+    usd.category_size = 1;
+    usd.category = upm_rotaryencoder_category;
+    return usd;
+}
+
+static const upm_sensor_ft ft =
+{
+    .upm_sensor_init_name = upm_rotaryencoder_init_name,
+    .upm_sensor_close = upm_rotaryencoder_close,
+    .upm_sensor_get_descriptor = upm_rotaryencoder_get_descriptor
+};
+
+static const upm_rotaryencoder_ft rft =
+{
+    .upm_rotaryencoder_get_position = upm_rotaryencoder_get_pos,
+    .upm_rotaryencoder_set_position = upm_rotaryencoder_set_pos,
+};
+
+const void* upm_rotaryencoder_get_ft(upm_sensor_t sensor_type)
+{
+    if (sensor_type == UPM_SENSOR)
+        return &ft;
+
+    if (sensor_type == UPM_ROTARYENCODER)
+        return &rft;
+
+    return NULL;
+}
+
+void* upm_rotaryencoder_init_name()
+{
+    return NULL;
+}
+
+void upm_rotaryencoder_close(void* dev)
+{
+    rotaryencoder_close((rotaryencoder_context)dev);
+}
+
+upm_result_t upm_rotaryencoder_set_pos(const void *dev, int pos)
+{
+    rotaryencoder_set_position((rotaryencoder_context)dev, pos);
+    return UPM_SUCCESS;
+}
+
+upm_result_t upm_rotaryencoder_get_pos(const void *dev, int *pos)
+{
+    *pos = rotaryencoder_get_position((rotaryencoder_context)dev);
+    return UPM_SUCCESS;
+}