lm35: add C driver and example; FTI; C++ wraps C

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

src/lm35/lm35_fti.c

@@ -0,0 +1,135 @@
+/*
+ * 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 "lm35.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_lm35_name[] = "LM35";
+const char upm_lm35_description[] = "LM35 Analog Temperature Sensor";
+const upm_protocol_t upm_lm35_protocol[] = {UPM_ANALOG};
+const upm_sensor_t upm_lm35_category[] = {UPM_TEMPERATURE};
+
+// forward declarations
+const upm_sensor_descriptor_t upm_lm35_get_descriptor();
+const void* upm_lm35_get_ft(upm_sensor_t sensor_type);
+upm_result_t upm_lm35_get_value(void* dev, float* tempval,
+                                upm_temperature_u unit);
+void* upm_lm35_init_name();
+void upm_lm35_close(void* dev);
+upm_result_t upm_lm35_set_offset(void *dev, float offset);
+upm_result_t upm_lm35_set_scale(void *dev, float scale);
+
+const upm_sensor_descriptor_t upm_lm35_get_descriptor()
+{
+    upm_sensor_descriptor_t usd;
+    usd.name = upm_lm35_name;
+    usd.description = upm_lm35_description;
+    usd.protocol_size = 1;
+    usd.protocol = upm_lm35_protocol;
+    usd.category_size = 1;
+    usd.category = upm_lm35_category;
+    return usd;
+}
+
+static const upm_sensor_ft ft =
+{
+    .upm_sensor_init_name = &upm_lm35_init_name,
+    .upm_sensor_close = &upm_lm35_close,
+    .upm_sensor_get_descriptor = &upm_lm35_get_descriptor
+};
+
+static const upm_temperature_ft tft =
+{
+    .upm_temperature_get_value = &upm_lm35_get_value,
+    .upm_temperature_set_scale = &upm_lm35_set_scale,
+    .upm_temperature_set_offset = &upm_lm35_set_offset,
+};
+
+const void* upm_lm35_get_ft(upm_sensor_t sensor_type)
+{
+    if (sensor_type == UPM_SENSOR)
+        return &ft;
+
+    if (sensor_type == UPM_TEMPERATURE)
+        return &tft;
+
+    return NULL;
+}
+
+void* upm_lm35_init_name()
+{
+    return NULL;
+}
+
+void upm_lm35_close(void* dev)
+{
+    lm35_close((lm35_context)dev);
+}
+
+upm_result_t upm_lm35_set_offset(void *dev, float offset)
+{
+    lm35_set_offset((lm35_context)dev, offset);
+    return UPM_SUCCESS;
+}
+upm_result_t upm_lm35_set_scale(void *dev, float scale)
+{
+    lm35_set_scale((lm35_context)dev, scale);
+    return UPM_SUCCESS;
+}
+
+upm_result_t upm_lm35_get_value(void* dev, float* tempval,
+                                 upm_temperature_u unit)
+{
+    float temp = 0.0;
+    upm_result_t rv = lm35_get_temperature((lm35_context)dev, &temp);
+
+    if (rv != UPM_SUCCESS)
+        return rv;
+
+    switch (unit)
+        {
+        case CELSIUS:
+            *tempval = temp;
+            return UPM_SUCCESS;
+
+        case KELVIN:
+            *tempval = temp + 273.15;
+            return UPM_SUCCESS;
+
+        case FAHRENHEIT:
+            *tempval = temp * (9.0/5.0) + 32.0;
+            return UPM_SUCCESS;
+        }
+
+    return UPM_ERROR_INVALID_PARAMETER;
+}