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/*
* Copyright (C) 2025 Andrea Mazzoleni
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef __THERMAL_H
#define __THERMAL_H
#include "elem.h"
/****************************************************************************/
/* thermal */
/**
* Period of temperature measures
*/
#define THERMAL_PERIOD_SECONDS 30
/**
* Max number of temperature measures
*/
#define THERMAL_MAX 100
/**
* Minimum value of the R^2 to consider valid a measure
*/
#define THERMAL_R_SQUARED_LIMIT 0.9
struct snapraid_thermal_point {
double temperature; /**< Temperatures in celsius */
double time; /**< Time in seconds */
};
struct snapraid_thermal_params {
double k_heat; /**< Heating coefficient */
double t_steady; /**< Steady state temperature during heating */
double t_ambient; /**< Ambient temperature */
double rmse; /**< Root mean square error of the fit */
double r_squared; /**< Coefficient of determination */
double max_error; /**< Maximum absolute error in fit */
};
struct snapraid_thermal {
uint64_t device; /**< Device ID. */
char name[PATH_MAX]; /**< Name of the disk. Note that it's not unique as more physical disks may map to the same logical disk */
int latest_temperature; /**< Latest temperature */
struct snapraid_thermal_point data[THERMAL_MAX]; /**< Measures. Stopped after the first sleep. */
unsigned count; /**< Number of measures */
struct snapraid_thermal_params params; /**< Estimated thermal parameters */
tommy_node node; /**< Next node in the list. */
};
/**
* Allocate a thermal state.
*/
struct snapraid_thermal* thermal_alloc(uint64_t dev, const char* name);
/**
* Deallocate a thermal state.
*/
void thermal_free(struct snapraid_thermal* thermal);
#endif
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