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#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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