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 template <class NumberDataType>
  21 bool string_to_number(NumberDataType& result,
  22                  const std::string& string_param,
  23                  std::ios_base& (*format)(std::ios_base&))
  24 {
  25         std::istringstream iss(string_param);
  26         return !(iss >> format >> result).fail();
  27 }
  28
  29 string convert_celcius_value_to_three_digits(string raw_value) {
  30         string  ret_val;
  31         int     int_val;
  32         bool    suc_flg;
  33         double  dbl_val;
  34
  35         suc_flg = string_to_number<double>(dbl_val, raw_value, dec);
  36         if (suc_flg == true) {
  37                 dbl_val = dbl_val / 1000;
  38                 std::ostringstream out;
  39                 out << fixed << setprecision(3) << dbl_val;
  40                 ret_val = out.str();
  41         }
  42         else {
  43                 ret_val = raw_value;
  44         }
  45         return ret_val;
  46 }
  47
  48 W1TemperatureSensor::W1TemperatureSensor(dirent *direntry,
  49                                 int family_code_param,
  50                                 string id_param): W1Device(direntry, family_code_param, id_param) {
  51         log_debug("trying to open file: %s\n", slave_file.c_str());
  52         ifstream ifs(slave_file.c_str());
  53         if (ifs.is_open() == false) {
  54                 string text;
  55
  56                 text    = get_time() + ": device type = " + get_devicetype_name() + ", id = " + id + ", could not read file: " + slave_file + "\n";
  57                 log_debug(text.c_str());
  58                 log_debug("verify that you have w1_therm kernel module loaded.\n");
  59                 ifs.close();
  60         }
  61 }
  62
  63 W1TemperatureSensor::~W1TemperatureSensor() {
  64 }
  65
  66 bool W1TemperatureSensor::is_supported_family_code(int family_code) {
  67         bool    ret_val;
  68
  69         ret_val = false;
  70         switch(family_code) {
  71                 case 0x10:
  72                 case 0x28:
  73                         ret_val = true;
  74                         break;
  75         }
  76         return ret_val;
  77 }
  78
  79 string W1TemperatureSensor::get_raw_value() {
  80         string          temp;
  81         string          ret_val;
  82         string          last_line;
  83         int             pos;
  84         int             length;
  85         string          formatted_data;
  86         int             int_value;
  87
  88         ret_val = "<could not read>";
  89         ifstream ifs(slave_file.c_str());
  90         if (ifs.is_open() == true) {
  91                 while(getline(ifs, temp)) {
  92                         if (temp.length() > 0) {
  93                                 last_line       = temp;
  94                         }
  95                 }
  96                 ifs.close();
  97                 length  = last_line.length();
  98                 if (length > 0) {
  99                         pos     = last_line.find("t=");
 100                         if ((pos >= 0) &&
 101                                 (pos + 2 < length)) {
 102                                 ret_val = last_line.substr(pos + 2);
 103                         }
 104                 }
 105         }
 106         ret_val = convert_celcius_value_to_three_digits(ret_val);
 107         return ret_val;
 108 }
 109
 110 string W1TemperatureSensor::get_unit() {
 111         return "C";
 112 }
 113
 114 string W1TemperatureSensor::get_devicetype_name() {
 115         return "Temperature Sensor";
 116 }