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/* collect_data.c - gkrellm-ThinkBat a Thinkpad battery monitor for Gkrellm2
*
* Copyright (C) 2006 Rasto Sramek <rasto@ksp.sk>
*
* 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 <stdio.h>
#include <fcntl.h>
#include <math.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include "collect_data.h"
#define BUF_LEN 32
#define FILE_LEN 128
#define SMAPI_PATH "/sys/devices/platform/smapi/"
#define BATTERY "BAT0/"
#define BATTERY1 "BAT1/"
#define DESIGN_CAPACITY "design_capacity"
#define REMAINING_CAPACITY "remaining_capacity"
#define POWER_AVG "power_avg"
#define POWER_NOW "power_now"
#define LAST_FULL "last_full_capacity"
#define AC "ac_connected"
#define REMAINING_RUNNING_TIME "remaining_running_time"
#define REMAINING_CHARGING_TIME "remaining_charging_time"
#define STATE "state"
static int design, remaining, last_full, power_avg, power_now, remaining_running_time, remaining_charging_time, ac, battery_present=1;
//int N = 0;
// Read all data (so we don't do it more times each tick)
void read_battery_data()
{
char file[FILE_LEN];
char state[100];
char battery[7];
FILE *fp;
/* Figure out if BAT0 or BAT1 is discharging */
sprintf(file, "%s%s%s", SMAPI_PATH, BATTERY, STATE);
fp = fopen(file, "r");
fscanf(fp, "%s", state);
fclose(fp);
if(!strncmp("discharging", state, 11) ||
!strncmp("charging", state, 8)) {
strncpy(battery, BATTERY, 6);
}
else if(!strncmp("idle", state, 4)) {
strncpy(battery, BATTERY1, 6);
}
sprintf(file, "%s%s%s", SMAPI_PATH, battery, DESIGN_CAPACITY);
design = read_from_file(file);
sprintf(file, "%s%s%s", SMAPI_PATH, battery, REMAINING_CAPACITY);
remaining = read_from_file(file);
sprintf(file, "%s%s%s", SMAPI_PATH, battery, POWER_NOW);
power_now = read_from_file(file);
sprintf(file, "%s%s%s", SMAPI_PATH, battery, POWER_AVG);
power_avg = read_from_file(file);
sprintf(file, "%s%s%s", SMAPI_PATH, battery, LAST_FULL);
last_full = read_from_file(file);
sprintf(file, "%s%s%s", SMAPI_PATH, battery, REMAINING_RUNNING_TIME);
remaining_running_time = read_from_file(file);
sprintf(file, "%s%s%s", SMAPI_PATH, battery, REMAINING_CHARGING_TIME);
remaining_charging_time = read_from_file(file);
sprintf(file, "%s%s", SMAPI_PATH, AC);
ac = read_from_file(file);
//DEBUG
// fprintf(stderr, "%d %d\n", N, remaining);
// N++;
}
// Remaining capacity, last full capacity, divide them
int get_percent_remaining()
{
return(floor(((double)remaining/(double)last_full)*100));
}
int get_ac_power()
{
return(ac);
}
// type == 0 - avg, type==1 - now
float get_power_change(int type)
{
if(type)
return(fabs((double)power_now/1000.0));
else
return(fabs((double)power_avg/1000.0));
}
// Read design capacity, remaining capacity, loading/unloading power, divide. Check loading/unloading
// type == 0 - avg, type==1 - now, type==2 - smapi
int get_time_remaining(int type)
{
double hours;
if(type == 0) {
if(power_now < 0) { // unloading
hours = (double)remaining/(double)abs(power_now);
} else if(power_now > 0) { // loading
hours = (double)(last_full-remaining)/(double)power_now;
} else {
hours = 0;
}
} else if(type == 1){
if(power_avg < 0) { // unloading
hours = (double)remaining/(double)abs(power_avg);
} else if(power_avg > 0) { // loading
hours = (double)(last_full-remaining)/(double)power_avg;
} else {
hours = 0;
}
} else {
if(power_avg < 0) { // unloading
hours = (double)remaining_running_time/60.0;
} else if(power_avg > 0) { // loading
hours = (double)remaining_charging_time/60.0;
} else {
hours = 0;
}
}
hours *= 60;
return(floor(hours));
}
int read_from_file(char *file)
{
int fd, data;
char buff[BUF_LEN], dump[10];
fd = open(file, O_RDONLY);
if(fd < 0) {
if(battery_present)
perror("open");
battery_present = 0;
return fd;
}
if(read(fd, buff, BUF_LEN) <= 0) {
if(battery_present)
fprintf(stderr, "thinkbat: couldn't read from %s, or file empty\n", file);
battery_present = 0;
close(fd);
return -1;
}
battery_present = 1;
sscanf(buff, "%d %s", &data, dump);
close(fd);
return data;
}
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