From 15d9095122c0d4f9a4dab05fb0e84d84c624e1b4 Mon Sep 17 00:00:00 2001
From: PA4WDH
Date: Sat, 20 May 2023 17:17:43 +0200
Subject: Translate POC to C code

---
 cputemp2maxfreq.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 cputemp2maxfreq.c

(limited to 'cputemp2maxfreq.c')

diff --git a/cputemp2maxfreq.c b/cputemp2maxfreq.c
new file mode 100644
index 0000000..1760996
--- /dev/null
+++ b/cputemp2maxfreq.c
@@ -0,0 +1,75 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include "sysfs.h"
+#include "cpufreq.h"
+#include "debug.h"
+
+struct s_cpudata {
+ long int min_freq;
+ long int max_freq;
+ long int cur_freq;
+ long int cur_temp;
+ long int scale_max;
+};
+
+struct s_config {
+ char *governor;
+ long int max_temp;
+ char *temp_input;
+ long int freq_step;
+ long int fallback_freq;
+ unsigned int interval;
+};
+
+struct s_cpudata cpudata;
+struct s_config config={"conservative",70000,"/sys/devices/virtual/thermal/thermal_zone0/temp",100000,2000000,10};
+
+int main()
+{
+ long int diff;
+ long int newfreq;
+ 
+ printf("Governor: %s\nTemp input: %s\n",config.governor,config.temp_input);
+
+ if (cpufreq_set_str("scaling_governor",config.governor,0)!=0)
+ {
+  printf("Failed to set governow\n");
+  exit(1);
+ }
+
+ cpudata.min_freq=sysfs_read_long_int("/sys/devices/system/cpu/cpufreq/policy0/cpuinfo_min_freq");
+ cpudata.max_freq=sysfs_read_long_int("/sys/devices/system/cpu/cpufreq/policy0/cpuinfo_max_freq");
+ cpudata.scale_max=sysfs_read_long_int("/sys/devices/system/cpu/cpufreq/policy0/scaling_max_freq");
+
+ while(1)
+ {
+  cpudata.cur_freq=sysfs_read_long_int("/sys/devices/system/cpu/cpufreq/policy0/scaling_cur_freq");
+  cpudata.cur_temp=sysfs_read_long_int(config.temp_input);
+
+
+  DEBUG1_MAIN("Data: %ld %ld %ld %ld %ld\n",cpudata.cur_temp,config.max_temp,cpudata.max_freq,cpudata.scale_max,cpudata.cur_freq);
+
+  if ((cpudata.cur_temp<config.max_temp) && (cpudata.scale_max<cpudata.max_freq))
+  {
+   diff=(config.max_temp-cpudata.cur_temp)/1000;
+   newfreq=cpudata.scale_max+(config.freq_step*diff);
+   if (newfreq>cpudata.max_freq) newfreq=cpudata.max_freq;
+   DEBUG1_MAIN("Increase to %ld\n",newfreq);
+   cpufreq_set_long_int("scaling_max_freq",newfreq,100);
+   cpudata.scale_max=sysfs_read_long_int("/sys/devices/system/cpu/cpufreq/policy0/scaling_max_freq");
+  }
+
+  if ((cpudata.cur_temp>config.max_temp) && (cpudata.scale_max>cpudata.min_freq))
+  {
+   diff=(cpudata.cur_temp-config.max_temp)/1000;
+   newfreq=cpudata.scale_max-(config.freq_step*diff);
+   if (newfreq<cpudata.min_freq) newfreq=cpudata.min_freq;
+   DEBUG1_MAIN("Decrease to %ld\n",newfreq);
+   cpufreq_set_long_int("scaling_max_freq",newfreq,100);
+   cpudata.scale_max=sysfs_read_long_int("/sys/devices/system/cpu/cpufreq/policy0/scaling_max_freq");
+  }
+
+  sleep(config.interval);
+ }
+}
-- 
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