iio_core: Patches for IIO core kernel standard

Applying patches from Kuan Loon Lay.

Signed-off-by: Noel Eck <noel.eck@intel.com>

src/kxcjk1013/kxcjk1013.cxx

@@ -1,6 +1,6 @@
 /*
  * Author: Lay, Kuan Loon <kuan.loon.lay@intel.com>
- * Copyright (c) 2015 Intel Corporation.
+ * 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
@@ -30,8 +30,6 @@
 
 #define NUMBER_OF_BITS_IN_BYTE 8
 
-#define NUMBER_OF_BITS_IN_BYTE 8
-
 using namespace upm;
 
 KXCJK1013::KXCJK1013(int device)
@@ -51,7 +49,7 @@ KXCJK1013::KXCJK1013(int device)
     if (mraa_iio_create_trigger(m_iio, trigger) != MRAA_SUCCESS)
         fprintf(stderr, "Create trigger %s failed\n", trigger);
 
-    if (mraa_iio_get_mounting_matrix(m_iio, m_mount_matrix) == MRAA_SUCCESS)
+    if (mraa_iio_get_mount_matrix(m_iio, "in_mount_matrix", m_mount_matrix) == MRAA_SUCCESS)
         m_mount_matrix_exist = true;
     else
         m_mount_matrix_exist = false;
@@ -62,7 +60,7 @@ KXCJK1013::KXCJK1013(int device)
 
 KXCJK1013::~KXCJK1013()
 {
-    if(m_iio)
+    if (m_iio)
         mraa_iio_close(m_iio);
 }
 
@@ -146,6 +144,7 @@ KXCJK1013::disableBuffer()
 bool
 KXCJK1013::setScale(float scale)
 {
+    m_scale = scale;
     mraa_iio_write_float(m_iio, "in_accel_scale", scale);
 
     return true;
@@ -187,6 +186,7 @@ KXCJK1013::extract3Axis(char* data, float* x, float* y, float* z)
     iio_y = getChannelValue((unsigned char*) (data + channels[1].location), &channels[1]);
     iio_z = getChannelValue((unsigned char*) (data + channels[2].location), &channels[2]);
 
+    // Raw data is acceleration in direction. Units after application of scale are m/s^2
     *x = (iio_x * m_scale);
     *y = (iio_y * m_scale);
     *z = (iio_z * m_scale);

src/kxcjk1013/kxcjk1013.hpp

@@ -1,6 +1,6 @@
 /*
  * Author: Lay, Kuan Loon <kuan.loon.lay@intel.com>
- * Copyright (c) 2015 Intel Corporation.
+ * 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
@@ -85,7 +85,7 @@ class KXCJK1013
 
     /**
      * Enable trigger buffer
-     * @param trigger buffer length in string
+     * @param trigger buffer length in integer
      */
     bool enableBuffer(int length);
 
@@ -96,13 +96,18 @@ class KXCJK1013
 
     /**
      * Set scale
-     * @param scale in string
+     * @param scale in float
+     * Available scales are 0.009582(2g), 0.019163(4g), and 0.038326(8g)
+     * Default scale is 0.019163
      */
     bool setScale(const float scale);
 
     /**
      * Set sampling frequency
-     * @param sampling frequency in string
+     * @param sampling frequency in float
+     * Available sampling frequency are 0.781000, 1.563000, 3.125000, 6.250000, 12.500000, 25, 50,
+     * 100, 200, 400, 800, and 1600
+     * Default sampling frequency is 25
      */
     bool setSamplingFrequency(const float sampling_frequency);
 
@@ -124,7 +129,7 @@ class KXCJK1013
     mraa_iio_context m_iio;
     int m_iio_device_num;
     bool m_mount_matrix_exist; // is mount matrix exist
-    float m_mount_matrix[9]; // mount matrix
-    float m_scale; // accelerometer data scale
+    float m_mount_matrix[9];   // mount matrix
+    float m_scale;             // accelerometer data scale
 };
 }