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                         snprintf(sensor_info[s].friendly_name,
  24                                  MAX_NAME_SIZE, "S%d-%s", s,
  25                                  sensor_info[s].internal_name);
  26                         sensor_info[s].friendly_name[MAX_NAME_SIZE-1] = '\0';
  27                 } else
  28                         sprintf(sensor_info[s].friendly_name, "S%d", s);
  29         }
  30
  31         return sensor_info[s].friendly_name;
  32 }
  33
  34
  35 char* sensor_get_vendor (int s)
  36 {
  37         if (sensor_info[s].vendor_name[0])
  38                 return sensor_info[s].vendor_name;
  39
  40         return "<unknown>";
  41 }
  42
  43
  44 int sensor_get_version (int handle)
  45 {
  46         return IIO_SENSOR_HAL_VERSION;
  47 }
  48
  49
  50 float sensor_get_max_range (int s)
  51 {
  52         int catalog_index;
  53         int sensor_type;
  54
  55         if (sensor_info[s].max_range != 0.0)
  56                 return sensor_info[s].max_range;
  57
  58         /* Try returning a sensible value given the sensor type */
  59
  60         /* We should cap returned samples accordingly... */
  61
  62         catalog_index = sensor_info[s].catalog_index;
  63         sensor_type = sensor_catalog[catalog_index].type;
  64
  65         switch (sensor_type) {
  66                 case SENSOR_TYPE_ACCELEROMETER:         /* m/s^2        */
  67                         return 50;
  68
  69                 case SENSOR_TYPE_MAGNETIC_FIELD:        /* micro-tesla  */
  70                         return 500;
  71
  72                 case SENSOR_TYPE_ORIENTATION:           /* degrees      */
  73                         return 360;
  74
  75                 case SENSOR_TYPE_GYROSCOPE:             /* radians/s    */
  76                         return 10;
  77
  78                 case SENSOR_TYPE_LIGHT:                 /* SI lux units */
  79                         return 50000;
  80
  81                 case SENSOR_TYPE_AMBIENT_TEMPERATURE:   /* °C          */
  82                 case SENSOR_TYPE_TEMPERATURE:           /* °C          */
  83                 case SENSOR_TYPE_PROXIMITY:             /* centimeters  */
  84                 case SENSOR_TYPE_PRESSURE:              /* hecto-pascal */
  85                 case SENSOR_TYPE_RELATIVE_HUMIDITY:     /* percent */
  86                         return 100;
  87
  88                 default:
  89                         return 0.0;
  90                 }
  91 }
  92
  93
  94 float sensor_get_resolution (int s)
  95 {
  96         return sensor_info[s].resolution;
  97 }
  98
  99
 100 float sensor_get_power (int s)
 101 {
 102         /* mA used while sensor is in use ; not sure about volts :) */
 103         return sensor_info[s].power;
 104 }