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/* $Id: battery.c,v 1.5 2004/01/06 22:33:14 reinelt Exp $
*
* APM and ACPI specific functions
*
* Copyright 2001 Leopold T�tsch <lt@toetsch.at>
*
* This file is part of LCD4Linux.
*
* LCD4Linux 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, or (at your option)
* any later version.
*
* LCD4Linux 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*
* $Log: battery.c,v $
* Revision 1.5 2004/01/06 22:33:14 reinelt
* Copyright statements cleaned up
*
* Revision 1.4 2003/10/05 17:58:50 reinelt
* libtool junk; copyright messages cleaned up
*
* Revision 1.3 2001/08/05 17:13:29 reinelt
*
* cleaned up inlude of sys/time.h and time.h
*
* Revision 1.2 2001/03/02 11:04:08 reinelt
*
* cosmetic cleanups (comment headers)
*
*/
/* exported functions:
*
* int Battery (double *perc, int *status, double *lasting);
* returns:
* perc ... percentage of battery (0..100)
* status .. 0 (online), 1 (charging), 2 (discharging)
* lasting ... seconds, how long battery will last
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <ctype.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <time.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "debug.h"
int Battery (int *perc, int *status, double *dur)
{
static int fd = -2;
static int apm = 0;
if (fd==-1) return -1;
if (fd==-2) {
fd = open("/proc/apm", O_RDONLY | O_NDELAY);
if (fd==-1) {
error ("open(/proc/apm) failed: %s", strerror(errno));
fd = open("/proc/acpi", O_RDONLY | O_NDELAY); /* FIXME */
if (fd==-1) {
error ("open(/proc/acpi) failed: %s", strerror(errno));
return -1;
}
debug ("open(/proc/acpi)=%d", fd);
}
else {
debug ("open(/proc/apm)=%d", fd);
apm = 1;
}
}
if (lseek(fd, 0L, SEEK_SET)!=0) {
error ("lseek(/proc/apm|acpi) failed: %s", strerror(errno));
fd=-1;
return -1;
}
if (apm) {
int f3, f4;
char eh[4];
char buffer[128];
/* /usr/src/linux/arch/i386/kernel/apm.c :
p += sprintf(p, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
driver_version,
(apm_bios_info.version >> 8) & 0xff,
apm_bios_info.version & 0xff,
apm_bios_info.flags,
ac_line_status,
battery_status,
battery_flag,
percentage,
time_units,
units);
3) AC line status
0x00: Off-line
0x01: On-line
0x02: On backup power (BIOS >= 1.1 only)
0xff: Unknown
4) Battery status
0x00: High
0x01: Low
0x02: Critical
0x03: Charging
0x04: Selected battery not present (BIOS >= 1.2 only)
0xff: Unknown
*/
if (read (fd, &buffer, sizeof(buffer)-1)==-1) {
error ("read(/proc/apm) failed: %s", strerror(errno));
fd=-1;
return -1;
}
/* Ver v.v fl as bs bf perc tu u*/
sscanf(buffer, "%*s %*s %*s %x %x %*s %d%% %lf %3s", &f3, &f4, perc, dur, eh);
if (f3 == 0x1)
*status = 0; /* Online */
else
*status = 2; /* Offline = discharging */
if (f4 == 0x3)
*status = 1; /* charging */
eh[1] = '\0'; /* m | s */
if (*eh == 'm')
*dur *= 60;
#ifdef DEBUG_BATT
info("perc=%d, f3=%x, f4=%x, stat=%d, dur=%lf", *perc,f3,f4, *status, *dur);
#endif
}
else {
/* FIXME: parse ACPI */
}
return 0;
}
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