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         ifstream ifs(slave_file.c_str());
  57         if (ifs.is_open() == false) {
  58                 log_error("%s: %s failed to read data from file: %s\n", id.c_str(), get_device_type().c_str(), slave_file.c_str());
  59                 log_error("Verify that you have w1_therm kernel module loaded.\n");
  60                 ifs.close();
  61         }
  62 }
  63
  64 W1TemperatureSensor::~W1TemperatureSensor() {
  65 }
  66
  67 bool W1TemperatureSensor::is_supported_w1_family_code(int family_code) {
  68         bool    ret_val;
  69
  70         ret_val = false;
  71         switch(family_code) {
  72                 case 0x10:
  73                 case 0x28:
  74                         ret_val = true;
  75                         break;
  76         }
  77         return ret_val;
  78 }
  79
  80 vector<double> *W1TemperatureSensor::get_raw_data() {
  81         vector<double>  *ret_val;
  82         string          tmp_str;
  83         string          val_str;
  84         double          val_dbl;
  85         int             pos;
  86         int             b_cnt;
  87         int             err_flg;
  88
  89         ret_val = NULL;
  90         err_flg = 0;
  91         ifstream ifs(slave_file.c_str());
  92         if (ifs.is_open() == true) {
  93                 while(getline(ifs, tmp_str)) {
  94                         if (tmp_str.empty() == false) {
  95                                 val_str = tmp_str;
  96                         }
  97                 }
  98                 ifs.close();
  99                 b_cnt   = val_str.length();
 100                 if (b_cnt > 0) {
 101                         pos     = val_str.find("t=");
 102                         if ((pos >= 0) &&
 103                             ((pos + 2) < b_cnt)) {
 104                                 val_str = val_str.substr(pos + 2);
 105                                 val_dbl = convert_w1_temperature_to_celcius(val_str, &err_flg);
 106                                 if (err_flg == 0) {
 107                                         ret_val = new vector<double>();
 108                                         ret_val->push_back(val_dbl);
 109                                 }
 110                         }
 111                 }
 112         }
 113         return ret_val;
 114 }
 115
 116 string W1TemperatureSensor::get_unit() {
 117         return CONST_UNIT_CELCIUS;
 118 }
 119
 120 string W1TemperatureSensor::get_device_type() {
 121         return "Temperature Sensor";
 122 }
 123
 124 unsigned int W1TemperatureSensor::get_data_decimal_precision() {
 125         return 3;
 126 }