summaryrefslogtreecommitdiff
path: root/battstat/apmlib/apmlib.c
blob: bf72e348f2d444378b29be0d68a35eec8ed98285 (plain)
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
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
/* apmlib.c -- Sample APM interface routines
 * Created: Mon Jan  8 10:28:16 1996 by faith@acm.org
 * Revised: Fri Dec 26 21:38:29 1997 by faith@acm.org
 * Copyright 1996, 1997 Rickard E. Faith (faith@acm.org)
 * 
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Library General Public License as published
 * by the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 * 
 * This library 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
 * Library General Public License for more details.
 * 
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <ctype.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/sysmacros.h>
#include "apm.h"

#define BACKWARD_COMPAT 1

/* If APM support of the right version exists in kernel, return zero.
 * Otherwise, return 1 if no support exists, or 2 if it is the wrong
 * version.  *NOTE* The sense of the return value is not intuitive.
 */
int apm_exists(void)
{
    apm_info i;

    if (access(APM_PROC, R_OK))
	return 1;
    return apm_read(&i);
}


/* Read information from /proc/apm.  Return 0 on success, 1 if APM not
 * installed, 2 if APM installed, but old version. 
 */
int apm_read(apm_info * i)
{
    FILE *str;
    char units[10];
    char buffer[100];
    int retcode = 0;

    if (!(str = fopen(APM_PROC, "r")))
	return 1;
    fgets(buffer, sizeof(buffer) - 1, str);
    buffer[sizeof(buffer) - 1] = '\0';

    /* Should check for other driver versions; driver 1.9 (and some
     * others) uses this format, which doesn't expose # batteries.
     */
    sscanf(buffer, "%s %d.%d %x %x %x %x %d%% %d %s\n",
	   (char *) i->driver_version,
	   &i->apm_version_major,
	   &i->apm_version_minor,
	   &i->apm_flags,
	   &i->ac_line_status,
	   &i->battery_status,
	   &i->battery_flags,
	   &i->battery_percentage,
	   &i->battery_time,
	   units);
    i->using_minutes = !strncmp(units, "min", 3) ? 1 : 0;
    if (i->driver_version[0] == 'B')
    {				/* old style.  argh. */
#if !BACKWARD_COMPAT
	retcode = 2;
#else
	strcpy((char *) i->driver_version, "pre-0.7");
	i->apm_version_major = 0;
	i->apm_version_minor = 0;
	i->apm_flags = 0;
	i->ac_line_status = 0xff;
	i->battery_status = 0xff;
	i->battery_flags = 0xff;
	i->battery_percentage = -1;
	i->battery_time = -1;
	i->using_minutes = 1;

	sscanf(buffer, "BIOS version: %d.%d",
	       &i->apm_version_major, &i->apm_version_minor);
	fgets(buffer, sizeof(buffer) - 1, str);
	sscanf(buffer, "Flags: 0x%02x", &i->apm_flags);
	if (i->apm_flags & APM_32_BIT_SUPPORT)
	{
	    fgets(buffer, sizeof(buffer) - 1, str);
	    fgets(buffer, sizeof(buffer) - 1, str);
	    if (buffer[0] != 'P')
	    {
		if (!strncmp(buffer + 4, "off line", 8))
		    i->ac_line_status = 0;
		else if (!strncmp(buffer + 4, "on line", 7))
		    i->ac_line_status = 1;
		else if (!strncmp(buffer + 4, "on back", 7))
		    i->ac_line_status = 2;

		fgets(buffer, sizeof(buffer) - 1, str);
		if (!strncmp(buffer + 16, "high", 4))
		    i->battery_status = 0;
		else if (!strncmp(buffer + 16, "low", 3))
		    i->battery_status = 1;
		else if (!strncmp(buffer + 16, "crit", 4))
		    i->battery_status = 2;
		else if (!strncmp(buffer + 16, "charg", 5))
		    i->battery_status = 3;

		fgets(buffer, sizeof(buffer) - 1, str);
		if (strncmp(buffer + 14, "unknown", 7))
		    i->battery_percentage = atoi(buffer + 14);
		if (i->apm_version_major >= 1 && i->apm_version_minor >= 1)
		{
		    fgets(buffer, sizeof(buffer) - 1, str);
		    sscanf(buffer, "Battery flag: 0x%02x", &i->battery_flags);

		    fgets(buffer, sizeof(buffer) - 1, str);
		    if (strncmp(buffer + 14, "unknown", 7))
			i->battery_time = atoi(buffer + 14);
		}
	    }
	}
#endif
    }

    /* Fix possible kernel bug -- percentage
     * set to 0xff (==255) instead of -1. 
     */
    if (i->battery_percentage > 100)
	i->battery_percentage = -1;

    fclose(str);
    return retcode;
}


/* Lookup the device number for the apm_bios device. */
dev_t apm_dev(void)
{
    FILE *str;
    static int cached = -1;
    char buf[80];
    char *pt;
    apm_info i;

    if (cached >= 0)
	return cached;

    if (access(APM_PROC, R_OK) || apm_read(&i) == 1)
	return cached = -1;
    if (i.driver_version[0] == '1')
	return cached = makedev(10, 134);

    if (!(str = fopen(APM_DEV, "r")))
	return -1;
    while (fgets(buf, sizeof(buf) - 1, str))
    {
	buf[sizeof(buf) - 1] = '\0';
	for (pt = buf; *pt && isspace(*pt); ++pt);	/* skip leading spaces */
	for (; *pt && !isspace(*pt); ++pt);	/* find next space */
	if (isspace(*pt))
	{
	    *pt++ = '\0';
	    pt[strlen(pt) - 1] = '\0';	/* get rid of newline */
	    if (!strcmp(pt, APM_NAME))
	    {
		fclose(str);
		return cached = makedev(atoi(buf), 0);
	    }
	}
    }
    fclose(str);
    return cached = -1;
}


/* Return a file descriptor for the apm_bios device, or -1 if there is an
 * error.  Is this method secure?  Should we make the device in /dev
 * instead of /tmp? 
 *
 * apenwarr 2001/05/11: just throw out the weird temporary device file stuff.
 *	It was only for ancient kernel versions anyway.
 */
int apm_open(void)
{
    int fd;
    apm_info i;

    if (access(APM_PROC, R_OK) || apm_read(&i) == 1)
	return -1;
    if (i.driver_version[0] >= '1')
    {
	if ((fd = open(APM_DEVICE, O_RDWR)) < 0)
	{
	    /* Try to create it.  This is reasonable
	     * for backward compatibility.
	     */
	    if (mknod(APM_DEVICE, S_IFCHR | S_IRUSR | S_IWUSR, apm_dev()))
	    {
		unlink(APM_DEVICE);
		return -1;
	    }
	    fd = open(APM_DEVICE, O_RDWR);
	}
	
	return fd;
    }
    
    return -1;
}


/* Given a file descriptor for the apm_bios device, close it. */
int apm_close(int fd)
{
    return close(fd);
}

/* Given a file descriptor for the apm_bios device, this routine will wait
 * timeout seconds for APM events.  Up to n events will be placed in the
 * events queue.  The return code will indicate the number of events
 * stored.  Since this routine uses select(2), it will return if an
 * unblocked signal is caught.  A timeout < 0 means to block indefinately.
 *
 * Note that if you read a request to standby or to suspend, the kernel
 * will be waiting for you to respond to it with a call to apm_suspend()
 * or to apm_standby() !
 */
int apm_get_events(int fd, int timeout, apm_event_t * events, int n)
{
    int retcode;
    fd_set fds;
    struct timeval t;

    t.tv_sec = timeout;
    t.tv_usec = 0;

    FD_ZERO(&fds);
    FD_SET(fd, &fds);
    retcode = select(fd + 1, &fds, NULL, NULL, timeout < 0 ? NULL : &t);
    if (retcode <= 0)
	return 0;
    return read(fd, events, n * sizeof(apm_event_t)) / sizeof(apm_event_t);
}


/* Try to set the Power State to Suspend. */
int apm_suspend(int fd)
{
    sync();
    return ioctl(fd, APM_IOC_SUSPEND, NULL);
}


/* Try to set the Power State to Standby. */
int apm_standby(int fd)
{
    sync();
    return ioctl(fd, APM_IOC_STANDBY, NULL);
}

/* Return the last error code generated by the kernel APM driver */
unsigned int apm_last_error( int fd )
{
    int err = 0;

#ifdef APM_IOC_LAST_ERROR
    int ierr = 0;
    if ( (ierr = ioctl( fd, APM_IOC_LAST_ERROR, &err)) )
	return ierr;
#endif
    return err;
}

/* Define lookup table for error messages */
typedef struct lookup_t {
	int	key;
	char *	msg;
} lookup_t;

/* APM error messages, arranged by error code */
static const lookup_t error_table[] = {
/* N/A	{ APM_SUCCESS,		"Operation succeeded" }, */
	{ APM_DISABLED,		"Power management disabled" },
	{ APM_CONNECTED,	"Real mode interface already connected" },
	{ APM_NOT_CONNECTED,	"Interface not connected" },
	{ APM_16_CONNECTED,	"16 bit interface already connected" },
/* N/A	{ APM_16_UNSUPPORTED,	"16 bit interface not supported" }, */
	{ APM_32_CONNECTED,	"32 bit interface already connected" },
	{ APM_32_UNSUPPORTED,	"32 bit interface not supported" },
	{ APM_BAD_DEVICE,	"Unrecognized device ID" },
	{ APM_BAD_PARAM,	"Parameter out of range" },
	{ APM_NOT_ENGAGED,	"Interface not engaged" },
#ifdef APM_BAD_FUNCTION
	{ APM_BAD_FUNCTION,     "Function not supported" },
#endif
#ifdef APM_RESUME_DISABLED
	{ APM_RESUME_DISABLED,	"Resume timer disabled" },
#endif
	{ APM_BAD_STATE,	"Unable to enter requested state" },
/* N/A	{ APM_NO_EVENTS,	"No events pending" }, */
	{ APM_NOT_PRESENT,	"No APM present" }
};
#define ERROR_COUNT	(sizeof(error_table)/sizeof(lookup_t))

/* Return character string describing error messages from APM kernel */
const char *apm_error_name( unsigned int err )
{
  int i;
  
  for(i=0; i<ERROR_COUNT; i++)
    if(err == error_table[i].key) return(error_table[i].msg);

  return "Unknown error";
}

int apm_reject( int fd )
{
#ifdef APM_IOC_REJECT
    if ( ioctl( fd, APM_IOC_REJECT, NULL ) ) 
	return apm_last_error( fd );
    else
#endif
	return 0;
}

#ifdef APM_IOC_IGNORE		/* detect kernel support of IGNORE/NOIGNORE functions */
int apm_set_ignore(int fd, int mode)
/* Ignore Standby. */
{
    if (mode == IGNORE)
    {
	printf("Telling kernel to ignore system standby/suspend mode\n");
	return ioctl(fd, APM_IOC_IGNORE, NULL);
    }
    else
    {
	printf("Telling kernel not to ignore system standby/suspend mode\n");
	return ioctl(fd, APM_IOC_NOIGNORE, NULL);
    }
    printf("NOTE: User-generated suspend/standby requests are not ignored\n");
}
#endif

/* Return a string describing the event. From p. 16 of the Intel/Microsoft
 * Advanded Power Management (APM) BIOS Interface Specification, Revision
 * 1.1 (September 1993). Intel Order Number: 241704-001.  Microsoft Part
 * Number: 781-110-X01.
 *
 * Updated to APM BIOS 1.2 spec (February 1996).  Available on-line.
 */
const char *apm_event_name(apm_event_t event)
{
    switch (event)
    {
    case APM_SYS_STANDBY:
	return "System Standby Request";
    case APM_SYS_SUSPEND:
	return "System Suspend Request";
    case APM_NORMAL_RESUME:
	return "Normal Resume System";
    case APM_CRITICAL_RESUME:
	return "Critical Resume System";
    case APM_LOW_BATTERY:
	return "Battery Low";
    case APM_POWER_STATUS_CHANGE:
	return "Power Status Change";
    case APM_UPDATE_TIME:
	return "Update Time";
    case APM_CRITICAL_SUSPEND:
	return "Critical Suspend";
    case APM_USER_STANDBY:
	return "User System Standby Request";
    case APM_USER_SUSPEND:
	return "User System Suspend Request";
    case APM_STANDBY_RESUME:
	return "System Standby Resume";
#ifdef APM_CAPABILITY_CHANGE
    case APM_CAPABILITY_CHANGE:
	return "Capability Change";
#endif
    }
    return "Unknown";
}


/* This is a convenience function that has nothing to do with APM.  It just
 * formats a time nicely.  If you don't like this format, then write your
 * own.
 */
#define SEC_PER_DAY  (60*60*24)
#define SEC_PER_HOUR (60*60)
#define SEC_PER_MIN  (60)

const char *apm_delta_time(time_t then, time_t now)
{
    return apm_time(now - then);
}

const char *apm_time(time_t t)
{
    static char buffer[128];
    unsigned long s, m, h, d;

    d = t / SEC_PER_DAY;
    t -= d * SEC_PER_DAY;
    h = t / SEC_PER_HOUR;
    t -= h * SEC_PER_HOUR;
    m = t / SEC_PER_MIN;
    t -= m * SEC_PER_MIN;
    s = t;

    if (d)
	sprintf(buffer, "%lu day%s, %02lu:%02lu:%02lu",
		d, d > 1 ? "s" : "", h, m, s);
    else
	sprintf(buffer, "%02lu:%02lu:%02lu", h, m, s);

    if (t == -1)
	sprintf(buffer, "unknown");

    return buffer;
}

const char *apm_time_nosec(time_t t)
{
    static char buffer[128];
    unsigned long s, m, h, d;

    d = t / SEC_PER_DAY;
    t -= d * SEC_PER_DAY;
    h = t / SEC_PER_HOUR;
    t -= h * SEC_PER_HOUR;
    m = t / SEC_PER_MIN;
    t -= m * SEC_PER_MIN;
    s = t;

    if (s > 30)
	++m;

    if (d)
	sprintf(buffer, "%lu day%s, %lu:%02lu",
		d, d > 1 ? "s" : "", h, m);
    else
	sprintf(buffer, "%lu:%02lu", h, m);

    if (t == -1)
	sprintf(buffer, "unknown");

    return buffer;
}