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/*
* Copyright (C) 2002,2003,2004 Mattia Dongili<dongili@supereva.it>
* George Staikos <staikos@0wned.org>
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "cpufreqd.h"
#include "main.h"
#include "sys_check.h"
/* int select_pm_plugin
*
* Check the existance of power interfaces trying
* to call the check function for each plugin
*/
/* int find_cpufreq_interface(general *configuration)
*
* Checks whether we need to use the 2.4 or 2.5/2.6
* cpufreq interface and sets the has_sysfs bit
* accordingly.
*
* Returns 0 on success, -1 otherwise
*/
int find_cpufreq_interface(general *configuration) {
struct stat sb;
int rc;
/* try first with the 2.6 series */
rc = stat(CPUFREQ_SYSFS_INTERFACE, &sb);
if (rc == 0) {
FILE *fp;
char buf[256];
cp_log(LOG_DEBUG, "find_cpufreq_interface(): found %s interface.\n", CPUFREQ_SYSFS_INTERFACE);
configuration->has_sysfs = 1;
/* Read min freq to translate frequencies */
fp = fopen(CPUFREQ_SYSFS_INTERFACE_CPUMIN, "r");
if (!fp || !fgets(buf, 255, fp)) {
cp_log(LOG_ERR, "find_cpufreq_interface(): %s: %s\n",
CPUFREQ_SYSFS_INTERFACE_CPUMIN, strerror(errno));
return -1;
}
configuration->cpu_min_freq = atoi(buf);
cp_log(LOG_DEBUG, "find_cpufreq_interface(): minimum available frequency %d\n", configuration->cpu_min_freq);
fclose(fp);
/* Read max freq to translate frequencies */
fp = fopen(CPUFREQ_SYSFS_INTERFACE_CPUMAX, "r");
if (!fp || !fgets(buf, 255, fp)) {
cp_log(LOG_ERR, "find_cpufreq_interface(): %s: %s\n",
CPUFREQ_SYSFS_INTERFACE_CPUMAX, strerror(errno));
return -1;
}
configuration->cpu_max_freq = atoi(buf);
cp_log(LOG_DEBUG, "find_cpufreq_interface(): maximum available frequency %d\n", configuration->cpu_max_freq);
fclose(fp);
return 0;
}
/* try with the 2.4 series or the deprecated /prco/cpufreq interface also */
rc = stat(CPUFREQ_PROC_INTERFACE, &sb);
if (rc == 0) {
cp_log(LOG_DEBUG, "find_cpufreq_interface(): found %s interface.\n", CPUFREQ_PROC_INTERFACE);
configuration->has_sysfs = 0;
return 0;
}
cp_log(LOG_ERR, "find_cpufreq_interface(): no cpufreq interface found.\n");
return -1;
}
/* int get_cpu_num(general *configuration)
*
* Gets the number of installed CPUs from procfs
* and sets cpu_num appropriately.
*
* Returns 0 on success, -1 on error
*/
int get_cpu_num(general *configuration)
{
FILE *fp;
int n;
char line[256];
fp = fopen(CPUINFO_PROC, "r");
if(!fp) {
cp_log(LOG_ERR, "get_cpu_num(): %s: %s\n", CPUINFO_PROC, strerror(errno));
return -1;
}
n = 0;
while(!feof(fp)) {
fgets(line, 255, fp);
if(!strncmp(line, "processor", 9))
n++;
}
fclose(fp);
cp_log(LOG_DEBUG, "get_cpu_num(): found %i CPUs\n", n);
configuration->cpu_num = n;
return 0;
}
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