dvfs_core.h

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/*
 * libdvfs - A light library to set CPU governor and frequency
 * Copyright (C) 2013-2014 Universite de Versailles
 *
 * 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/>.
 */

#pragma once

#include <fcntl.h>
#include <semaphore.h>
#include <stdbool.h>
#include <stdio.h>

typedef struct {
   unsigned int id;        
   unsigned int nb_freqs;  
   unsigned int *freqs;    

   FILE *fd_setf;          
   FILE *fd_getf;          

   char init_gov[128];     
   unsigned int init_freq; 

   sem_t *sem;             
} dvfs_core;

int dvfs_core_open(dvfs_core** ppCore, unsigned int id, bool seq);

int dvfs_core_close(dvfs_core *core);

int dvfs_core_get_gov(const dvfs_core *core, char *buf, size_t buf_len);

int dvfs_core_set_gov(const dvfs_core *core, const char *gov);

int dvfs_core_set_freq(const dvfs_core *core, unsigned int freq);

int dvfs_core_get_current_freq(const dvfs_core *core, unsigned int* pFreq);

int dvfs_core_get_freq(const dvfs_core *core, unsigned int* pFreq, unsigned int freq_id);

int dvfs_core_get_nb_freqs (const dvfs_core *core, unsigned int* pNbFreq);

int dvfs_core_get_id(const dvfs_core* core, unsigned int* pID);