dfrorp: Initial implementation

This module implements support for the DFRobot Analog ORP
(Oxidation/Reduction Potential) Meter.

It requires 5.0 volts, but the more accurate the voltage specified (to
the constructor), the more accurate the meter (paraphrased from the
wiki).

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

include/fti/upm_orp.h

@@ -0,0 +1,48 @@
+/*
+ * 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.
+ */
+#ifndef UPM_ORP_H_
+#define UPM_ORP_H_
+
+#include "upm_types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* ORP (Oxidation/Reduction Potential) function table */
+typedef struct _upm_orp_ft
+{
+    /* Set sensor offset */
+    upm_result_t (*upm_orp_set_offset) (const void* dev, float offset);
+    /* Set sensor scale */
+    upm_result_t (*upm_orp_set_scale) (const void* dev, float scale);
+    /* Read sensor value */
+    upm_result_t (*upm_orp_get_value) (const void* dev, float *value);
+} upm_orp_ft;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* UPM_ORP_H_ */

include/upm_fti.h

@@ -70,7 +70,8 @@ typedef enum {
     UPM_VIDEO,
     UPM_VOLTAGE,
     UPM_WIRELESS,
-    UPM_STREAM
+    UPM_STREAM,
+    UPM_ORP
 } upm_sensor_t;
 
 /* Supported IO protocols via MRAA */
@@ -114,6 +115,7 @@ typedef struct _upm_sensor_ft* (*func_get_upm_sensor_ft)(upm_sensor_t sensor_typ
 #include <fti/upm_moisture.h>
 #include <fti/upm_light.h>
 #include <fti/upm_stream.h>
+#include <fti/upm_orp.h>
 
 #ifdef __cplusplus
 }