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/* This file is part of cputemp2maxfreq.
Copyright (C) 2023-2024 pa4wdh
cputemp2maxfreq is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License , or
(at your option) any later version.
cputemp2maxfreq is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with cputemp2maxfreq; see the file COPYING. If not, see
<http://www.gnu.org/licenses>.
*/
#include <stdio.h>
#include <sys/types.h>
#include <dirent.h>
#include <string.h>
#include "cputemp2maxfreq.h"
#include "debug.h"
#include "sysfs.h"
#include "cputemp.h"
extern struct s_config config;
// Check if the sensor matches our search criteria and validate the readout
void cputemp_match_and_validate(char *name_file,char *input_file,char *sensor_name,struct s_sensor *sensor)
{
int datalen;
long int testdata;
char buf[255];
// Read the name to see if it matches what we're looking for
datalen=sysfs_read_str(name_file,buf,sizeof(buf));
if (datalen<0)
{
DEBUG2_CPUTEMP("Failed to read name\n");
return;
}
DEBUG1_CPUTEMP("Name is: %s\n",buf);
if (strncasecmp(buf,sensor_name,255)==0)
{
DEBUG2_CPUTEMP("Name machtes our search criteria\n");
DEBUG1_CPUTEMP("Input filename: %s\n",input_file);
// Validate the sensor by reading it
testdata=sysfs_read_long_int(input_file);
DEBUG2_CPUTEMP("Input value: %ld\n",testdata);
if ((testdata>=VALID_TEMP_MIN) && (testdata<=VALID_TEMP_MAX))
{
DEBUG1_CPUTEMP("Input data is valid, marking sensor as valid\n");
sensor->valid=1;
strncpy(sensor->name,buf,sizeof(buf));
strncpy(sensor->filename,input_file,sizeof(sensor->filename));
} else {
DEBUG1_CPUTEMP("Input data is invalid, ignoring sensor\n");
}
}
}
// Validate if we found a file named temp<number>_label
int cputemp_is_label(char *name)
{
int count;
int offset;
// Start with "temp"
if (strncmp(name,"temp",4)!=0) return 0;
// Must contain an underscore
offset=0;
for(count=5;count<7;count++)
{
if (name[count]=='_')
{
offset=count+1;
break;
}
}
if (offset==0) return 0;
// Ends with "label"
if (strncmp(name+offset,"label",5)!=0) return 0;
if (name[offset+5]==0) return 1;
return 0;
}
// Read a single hwmon directory and search for the requested sensor name
void cputemp_read_hwmon(char *hwmon,char *sensor_name,struct s_sensor *sensor)
{
DIR *hwmon_dir;
struct dirent *hwmon_dirent;
char name_file[258];
char input_file[255];
int offset;
DEBUG1_CPUTEMP("Searching for sensors in %s\n",hwmon);
hwmon_dir=opendir(hwmon);
if (hwmon_dir==NULL)
{
DEBUG1_CPUTEMP("Failed to open hwmon dir\n");
return;
}
hwmon_dirent=readdir(hwmon_dir);
while((hwmon_dirent!=NULL) && (sensor->valid==0))
{
DEBUG3_CPUTEMP("%s\n",hwmon_dirent->d_name);
if (cputemp_is_label(hwmon_dirent->d_name))
{
DEBUG2_CPUTEMP("Found label %s\n",hwmon_dirent->d_name);
snprintf(name_file,258,"%s/%s",hwmon,hwmon_dirent->d_name);
snprintf(input_file,258,"%s/%s",hwmon,hwmon_dirent->d_name);
offset=(int) strlen(input_file)-5;
strncpy(input_file+offset,"input",6);
cputemp_match_and_validate(name_file,input_file,sensor_name,sensor);
}
hwmon_dirent=readdir(hwmon_dir);
}
closedir(hwmon_dir);
// Some drivers do note have labels, so check the driver too if we didn't find anything so far
if (sensor->valid==0)
{
DEBUG2_CPUTEMP("Checking driver name\n");
sprintf(name_file,"%s/name",hwmon);
sprintf(input_file,"%s/temp1_input",hwmon);
cputemp_match_and_validate(name_file,input_file,sensor_name,sensor);
}
}
// Find all entries under /sys/class/hwmon and check them with
// cputemp_read_hwmon
void cputemp_find_sensor(char *sensor_name,struct s_sensor *sensor)
{
DIR *hwmon_dir;
struct dirent *hwmon_dirent;
char subdir[273];
DEBUG1_CPUTEMP("Searching for sensor %s\n",sensor_name);
// Mark sensor data as invalid, it will be set valid if we find something
sensor->valid=0;
hwmon_dir=opendir("/sys/class/hwmon");
if (hwmon_dir==NULL)
{
DEBUG1_CPUTEMP("Failed to open /sys/class/hwmon, is sysfs mounted?\n");
return;
}
hwmon_dirent=readdir(hwmon_dir);
while((hwmon_dirent!=NULL) && (sensor->valid==0))
{
DEBUG3_CPUTEMP("Found file: %s\n",hwmon_dirent->d_name);
// If the name starts with hwmon try to read it
// Note that /sys/class/hwmon actually contains symlinks but we treat them like directories
if (strncmp(hwmon_dirent->d_name,"hwmon",5)==0)
{
snprintf(subdir,273,"/sys/class/hwmon/%s",hwmon_dirent->d_name);
DEBUG2_CPUTEMP("Found hwmon entry: %s\n",subdir);
cputemp_read_hwmon(subdir,sensor_name,sensor);
}
hwmon_dirent=readdir(hwmon_dir);
}
closedir(hwmon_dir);
}
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