src/W1TemperatureSensor.cc

   1 /*
   2  * W1TemperatureSensor.cc
   3  *
   4  *  Created on: Oct 20, 2010
   5  *      Author: lamikr
   6  */
   7 #include <fstream>
   8 #include <iostream>
   9 #include <sstream>
  10 #include <iomanip>
  11
  12 #include "W1Util.hh"
  13 #include "W1TemperatureSensor.hh"
  14
  15 #include <plp/log.h>
  16
  17 using namespace std;
  18 using namespace w1;
  19
  20 #define CONST_UNIT_CELCIUS      "C"
  21
  22 template <class NumberDataType>
  23 bool string_to_number(NumberDataType& result,
  24                  const std::string& string_param,
  25                  std::ios_base& (*format)(std::ios_base&))
  26 {
  27         std::istringstream iss(string_param);
  28         return !(iss >> format >> result).fail();
  29 }
  30
  31 double convert_w1_temperature_to_celcius(string raw_value, int *err_flg) {
  32         bool    suc_flg;
  33         double  dbl_val;
  34
  35         dbl_val = 0;
  36         suc_flg = string_to_number<double>(dbl_val, raw_value, dec);
  37         if (suc_flg == true) {
  38                 dbl_val         = dbl_val / 1000;
  39                 *err_flg        = 0;
  40 /*
  41                 std::ostringstream out;
  42                 out << fixed << setprecision(3) << dbl_val;
  43                 ret_val = out.str();
  44 */
  45         }
  46         else {
  47                 log_error("Failed to convert temperature %s to celsius value", raw_value.c_str());
  48                 *err_flg        = 1;
  49         }
  50         return dbl_val;
  51 }
  52
  53 W1TemperatureSensor::W1TemperatureSensor(int family_code_param,
  54                                 string device_id_param,
  55                                 dirent *direntry_param): W1Device(family_code_param, device_id_param, direntry_param) {
  56         log_debug("trying to open file: %s\n", slave_file.c_str());
  57
  58         ifstream ifs(slave_file.c_str());
  59         if (ifs.is_open() == false) {
  60                 log_error("%s: %s failed to read data from file: %s\n", id.c_str(), get_device_type().c_str(), slave_file.c_str());
  61                 log_error("Verify that you have w1_therm kernel module loaded.\n");
  62                 ifs.close();
  63         }
  64 }
  65
  66 W1TemperatureSensor::~W1TemperatureSensor() {
  67 }
  68
  69 bool W1TemperatureSensor::is_supported_w1_family_code(int family_code) {
  70         bool    ret_val;
  71
  72         ret_val = false;
  73         switch(family_code) {
  74                 case 0x10:
  75                 case 0x28:
  76                         ret_val = true;
  77                         break;
  78         }
  79         return ret_val;
  80 }
  81
  82 vector<double> *W1TemperatureSensor::get_raw_data() {
  83         vector<double>  *ret_val;
  84         string          tmp_str;
  85         string          val_str;
  86         double          val_dbl;
  87         int             pos;
  88         int             b_cnt;
  89         int             err_flg;
  90
  91         ret_val = NULL;
  92         err_flg = 0;
  93         ifstream ifs(slave_file.c_str());
  94         if (ifs.is_open() == true) {
  95                 while(getline(ifs, tmp_str)) {
  96                         if (tmp_str.empty() == false) {
  97                                 val_str = tmp_str;
  98                         }
  99                 }
 100                 ifs.close();
 101                 b_cnt   = val_str.length();
 102                 if (b_cnt > 0) {
 103                         pos     = val_str.find("t=");
 104                         if ((pos >= 0) &&
 105                             ((pos + 2) < b_cnt)) {
 106                                 val_str = val_str.substr(pos + 2);
 107                                 val_dbl = convert_w1_temperature_to_celcius(val_str, &err_flg);
 108                                 if (err_flg == 0) {
 109                                         ret_val = new vector<double>();
 110                                         ret_val->push_back(val_dbl);
 111                                 }
 112                         }
 113                 }
 114         }
 115         return ret_val;
 116 }
 117
 118 string W1TemperatureSensor::get_unit() {
 119         return CONST_UNIT_CELCIUS;
 120 }
 121
 122 string W1TemperatureSensor::get_device_type() {
 123         return "Temperature Sensor";
 124 }
 125
 126 unsigned int W1TemperatureSensor::get_data_decimal_precision() {
 127         return 3;
 128 }