1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
/*
* battery.c interface to APM and (TODO:) ACPI
*
*/
/* 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 <sys/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;
}
|
