description.c

   1 /*
   2  * Copyright (C) 2014 Intel Corporation.
   3  */
   4
   5 #include <utils/Log.h>
   6 #include <hardware/sensors.h>
   7 #include "enumeration.h"
   8
   9 /*
  10  * This information should be provided on a sensor basis through a configuration
  11  * file, or we should build a catalog of known sensors.
  12  */
  13
  14 #define IIO_SENSOR_HAL_VERSION  1
  15
  16
  17 char* sensor_get_name (int s)
  18 {
  19         if (sensor_info[s].friendly_name[0] == '\0') {
  20
  21                 /* If we got a iio device name from sysfs, use it */
  22                 if (sensor_info[s].internal_name[0])
  23                         sprintf(sensor_info[s].friendly_name, "S%d-%s", s,
  24                                 sensor_info[s].internal_name);
  25                 else
  26                         sprintf(sensor_info[s].friendly_name, "S%d", s);
  27         }
  28
  29         return sensor_info[s].friendly_name;
  30 }
  31
  32
  33 char* sensor_get_vendor (int s)
  34 {
  35         if (sensor_info[s].vendor_name[0])
  36                 return sensor_info[s].vendor_name;
  37
  38         return "<unknown>";
  39 }
  40
  41
  42 int sensor_get_version (int handle)
  43 {
  44         return IIO_SENSOR_HAL_VERSION;
  45 }
  46
  47
  48 float sensor_get_max_range (int s)
  49 {
  50         int catalog_index;
  51         int sensor_type;
  52
  53         if (sensor_info[s].max_range != 0.0)
  54                 return sensor_info[s].max_range;
  55
  56         /* Try returning a sensible value given the sensor type */
  57
  58         /* We should cap returned samples accordingly... */
  59
  60         catalog_index = sensor_info[s].catalog_index;
  61         sensor_type = sensor_catalog[catalog_index].type;
  62
  63         switch (sensor_type) {
  64                 case SENSOR_TYPE_ACCELEROMETER:         /* m/s^2        */
  65                         return 50;
  66
  67                 case SENSOR_TYPE_MAGNETIC_FIELD:        /* micro-tesla  */
  68                         return 500;
  69
  70                 case SENSOR_TYPE_ORIENTATION:           /* degrees      */
  71                         return 360;
  72
  73                 case SENSOR_TYPE_GYROSCOPE:             /* radians/s    */
  74                         return 10;
  75
  76                 case SENSOR_TYPE_LIGHT:                 /* SI lux units */
  77                         return 50000;
  78
  79                 case SENSOR_TYPE_AMBIENT_TEMPERATURE:   /* °C          */
  80                 case SENSOR_TYPE_TEMPERATURE:           /* °C          */
  81                 case SENSOR_TYPE_PROXIMITY:             /* centimeters  */
  82                 case SENSOR_TYPE_PRESSURE:              /* hecto-pascal */
  83                 case SENSOR_TYPE_RELATIVE_HUMIDITY:     /* percent */
  84                         return 100;
  85
  86                 default:
  87                         return 0.0;
  88                 }
  89 }
  90
  91
  92 float sensor_get_resolution (int s)
  93 {
  94         return sensor_info[s].resolution;
  95 }
  96
  97
  98 float sensor_get_power (int s)
  99 {
 100         /* mA used while sensor is in use ; not sure about volts :) */
 101         return sensor_info[s].power;
 102 }