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/*
* Copyright 2010, Intel Corporation
*
* This file is part of PowerTOP
*
* This program file 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; version 2 of the License.
*
* 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 in a file named COPYING; if not, write to the
* Free Software Foundation, Inc,
* 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
* or just google for it.
*
* Authors:
* Arjan van de Ven <arjan@linux.intel.com>
*/
#include <iostream>
#include <fstream>
#include <stdio.h>
#include <sys/types.h>
#include <dirent.h>
#include <math.h>
#include <unistd.h>
#include "../lib.h"
#include "device.h"
#include "thinkpad-fan.h"
#include "../parameters/parameters.h"
#include "../process/powerconsumer.h"
#include <string.h>
#include <unistd.h>
thinkpad_fan::thinkpad_fan(): device()
{
start_rate = 0;
end_rate = 0;
fan_index = get_param_index("thinkpad-fan");
fansqr_index = get_param_index("thinkpad-fan-sqr");
fancub_index = get_param_index("thinkpad-fan-cub");
r_index = get_result_index("thinkpad-fan");
register_sysfs_path("/sys/devices/platform/thinkpad_hwmon");
}
void thinkpad_fan::start_measurement(void)
{
/* read the rpms of the fan */
start_rate = read_sysfs("/sys/devices/platform/thinkpad_hwmon/fan1_input");
}
void thinkpad_fan::end_measurement(void)
{
end_rate = read_sysfs("/sys/devices/platform/thinkpad_hwmon/fan1_input");
report_utilization("thinkpad-fan", utilization());
}
double thinkpad_fan::utilization(void)
{
return (start_rate+end_rate) / 2;
}
void create_thinkpad_fan(void)
{
char filename[4096];
class thinkpad_fan *fan;
strcpy(filename, "/sys/devices/platform/thinkpad_hwmon/fan1_input");
if (access(filename, R_OK) !=0)
return;
register_parameter("thinkpad-fan", 10);
register_parameter("thinkpad-fan-sqr", 5);
register_parameter("thinkpad-fan-cub", 10);
fan = new class thinkpad_fan();
all_devices.push_back(fan);
}
double thinkpad_fan::power_usage(struct result_bundle *result, struct parameter_bundle *bundle)
{
double power;
double factor;
double util;
power = 0;
util = get_result_value(r_index, result);
if (util < 0)
util = 0;
/* physics dictact that fan power goes cubic with the rpms, but there's also a linear component for friction*/
factor = get_parameter_value(fancub_index, bundle);
power += factor * pow(util / 3600.0, 3);
factor = get_parameter_value(fansqr_index, bundle) - 5.0;
power += factor * pow(util / 3600.0, 2);
factor = get_parameter_value(fan_index, bundle) - 10.0;
power += util / 5000.0 * factor;
if (power <= 0.0)
power = 0.0;
return power;
}
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