From 16fb812a46d0e8cde432b58f7dbf6fce147eb89f Mon Sep 17 00:00:00 2001
From: PA4WDH
Date: Wed, 24 May 2023 12:57:25 +0200
Subject: Add CSV logging

---
 logger.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 63 insertions(+), 3 deletions(-)

(limited to 'logger.c')

diff --git a/logger.c b/logger.c
index 83e92e1..143b62e 100644
--- a/logger.c
+++ b/logger.c
@@ -3,13 +3,16 @@
 #include <syslog.h>
 #include <sys/time.h>
 #include <time.h>
-#include "cputemp2maxfreq.h"
 #include <string.h>
+#include <unistd.h>
+#include "cputemp2maxfreq.h"
+#include "debug.h"
 
 extern struct s_config config;
+extern struct s_cpudata cpudata;
 
-// These functions are not called directly. They are set by argparse in the
-// config.logger function pointer.
+// The logger_* functions are not called directly. They are set by argparse in
+// the config.logger function pointer.
 
 // No logging at all
 void logger_none(char *format,...) { }
@@ -69,3 +72,60 @@ void logger_kmsg(char *format,...)
   config.logger(buffer);
  }
 }
+
+// CSV logging fields:
+// 1: Timestamp
+// 2: CPU Minimum frequency
+// 3: CPU Maximum frequency
+// 4: CPU Current frequency
+// 5: CPU Temperature
+// 6: Target temperature
+// 7: Scaling maximum frequency before increase/decrease
+void csvlog_init()
+{
+ int exists;
+
+ DEBUG1_LOG("Started\n");
+ exists=access(config.csvlog,F_OK);
+ DEBUG1_LOG("File %s exists: %d\n",config.csvlog,exists);
+
+ if ((exists!=0) || (config.csvoverwrite==1))
+ {
+  DEBUG1_LOG("Creating/overwriting CSV file\n");
+  config.csvfile=fopen(config.csvlog,"w");
+  fputs("\"timestamp\","
+        "\"CPU Minumum frequency\","
+        "\"CPU Maximum frequency\","
+        "\"CPU Current frequency\","
+        "\"CPU Temperature\","
+        "\"Target temperature\","
+        "\"Scaling maximum frequency\"\n",config.csvfile);
+ } else {
+  DEBUG1_LOG("Appending to CSV file\n");
+  config.csvfile=fopen(config.csvlog,"a");
+ }
+}
+
+// Write a single line of CSV data
+void csvlog_write()
+{
+ struct timeval unixtime;
+ struct tm *time;
+ char timestring[255];
+
+ DEBUG1_LOG("Writing data series to CSV file\n");
+
+ gettimeofday(&unixtime,NULL);
+ time=localtime(&unixtime.tv_sec);
+ strftime(timestring,255,"%F %T",time);
+
+ fprintf(config.csvfile,"\"%s\",\"%ld\",\"%ld\",\"%ld\",\"%ld\",\"%ld\",\"%ld\"\n",timestring,cpudata.min_freq,cpudata.max_freq,cpudata.cur_freq,cpudata.cur_temp/1000,config.max_temp/1000,cpudata.scale_max);
+}
+
+// Close the CSV file
+void csvlog_close()
+{
+ DEBUG1_LOG("Closing CSV file\n");
+ fclose(config.csvfile);
+ config.csvfile=NULL;
+}
-- 
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