summaryrefslogtreecommitdiff
path: root/drivers/acpi/sbs.c
blob: aae65e8f70f358910eedc693a49a6a8677ed05f7 (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
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
/*
 *  sbs.c - ACPI Smart Battery System Driver ($Revision: 2.0 $)
 *
 *  Copyright (c) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
 *  Copyright (c) 2005-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
 *  Copyright (c) 2005 Rich Townsend <rhdt@bartol.udel.edu>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  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 <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>

#ifdef CONFIG_ACPI_PROCFS
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <asm/uaccess.h>
#endif

#include <linux/acpi.h>
#include <linux/timer.h>
#include <linux/jiffies.h>
#include <linux/delay.h>

#include <linux/power_supply.h>

#include "sbshc.h"

#define ACPI_SBS_CLASS			"sbs"
#define ACPI_AC_CLASS			"ac_adapter"
#define ACPI_BATTERY_CLASS		"battery"
#define ACPI_SBS_DEVICE_NAME		"Smart Battery System"
#define ACPI_SBS_FILE_INFO		"info"
#define ACPI_SBS_FILE_STATE		"state"
#define ACPI_SBS_FILE_ALARM		"alarm"
#define ACPI_BATTERY_DIR_NAME		"BAT%i"
#define ACPI_AC_DIR_NAME		"AC0"

enum acpi_sbs_device_addr {
	ACPI_SBS_CHARGER = 0x9,
	ACPI_SBS_MANAGER = 0xa,
	ACPI_SBS_BATTERY = 0xb,
};

#define ACPI_SBS_NOTIFY_STATUS		0x80
#define ACPI_SBS_NOTIFY_INFO		0x81

MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
MODULE_LICENSE("GPL");

static unsigned int cache_time = 1000;
module_param(cache_time, uint, 0644);
MODULE_PARM_DESC(cache_time, "cache time in milliseconds");

extern struct proc_dir_entry *acpi_lock_ac_dir(void);
extern struct proc_dir_entry *acpi_lock_battery_dir(void);
extern void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
extern void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);

#define MAX_SBS_BAT			4
#define ACPI_SBS_BLOCK_MAX		32

static const struct acpi_device_id sbs_device_ids[] = {
	{"ACPI0002", 0},
	{"", 0},
};
MODULE_DEVICE_TABLE(acpi, sbs_device_ids);

struct acpi_battery {
	struct power_supply bat;
	struct acpi_sbs *sbs;
#ifdef CONFIG_ACPI_PROCFS
	struct proc_dir_entry *proc_entry;
#endif
	unsigned long update_time;
	char name[8];
	char manufacturer_name[ACPI_SBS_BLOCK_MAX];
	char device_name[ACPI_SBS_BLOCK_MAX];
	char device_chemistry[ACPI_SBS_BLOCK_MAX];
	u16 alarm_capacity;
	u16 full_charge_capacity;
	u16 design_capacity;
	u16 design_voltage;
	u16 serial_number;
	u16 cycle_count;
	u16 temp_now;
	u16 voltage_now;
	s16 current_now;
	s16 current_avg;
	u16 capacity_now;
	u16 state_of_charge;
	u16 state;
	u16 mode;
	u16 spec;
	u8 id;
	u8 present:1;
};

#define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);

struct acpi_sbs {
	struct power_supply charger;
	struct acpi_device *device;
	struct acpi_smb_hc *hc;
	struct mutex lock;
#ifdef CONFIG_ACPI_PROCFS
	struct proc_dir_entry *charger_entry;
#endif
	struct acpi_battery battery[MAX_SBS_BAT];
	u8 batteries_supported:4;
	u8 manager_present:1;
	u8 charger_present:1;
};

#define to_acpi_sbs(x) container_of(x, struct acpi_sbs, charger)

static inline int battery_scale(int log)
{
	int scale = 1;
	while (log--)
		scale *= 10;
	return scale;
}

static inline int acpi_battery_vscale(struct acpi_battery *battery)
{
	return battery_scale((battery->spec & 0x0f00) >> 8);
}

static inline int acpi_battery_ipscale(struct acpi_battery *battery)
{
	return battery_scale((battery->spec & 0xf000) >> 12);
}

static inline int acpi_battery_mode(struct acpi_battery *battery)
{
	return (battery->mode & 0x8000);
}

static inline int acpi_battery_scale(struct acpi_battery *battery)
{
	return (acpi_battery_mode(battery) ? 10 : 1) *
	    acpi_battery_ipscale(battery);
}

static int sbs_get_ac_property(struct power_supply *psy,
			       enum power_supply_property psp,
			       union power_supply_propval *val)
{
	struct acpi_sbs *sbs = to_acpi_sbs(psy);
	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
		val->intval = sbs->charger_present;
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static int acpi_battery_technology(struct acpi_battery *battery)
{
	if (!strcasecmp("NiCd", battery->device_chemistry))
		return POWER_SUPPLY_TECHNOLOGY_NiCd;
	if (!strcasecmp("NiMH", battery->device_chemistry))
		return POWER_SUPPLY_TECHNOLOGY_NiMH;
	if (!strcasecmp("LION", battery->device_chemistry))
		return POWER_SUPPLY_TECHNOLOGY_LION;
	if (!strcasecmp("LiP", battery->device_chemistry))
		return POWER_SUPPLY_TECHNOLOGY_LIPO;
	return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
}

static int acpi_sbs_battery_get_property(struct power_supply *psy,
					 enum power_supply_property psp,
					 union power_supply_propval *val)
{
	struct acpi_battery *battery = to_acpi_battery(psy);

	if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
		return -ENODEV;
	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		if (battery->current_now < 0)
			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
		else if (battery->current_now > 0)
			val->intval = POWER_SUPPLY_STATUS_CHARGING;
		else
			val->intval = POWER_SUPPLY_STATUS_FULL;
		break;
	case POWER_SUPPLY_PROP_PRESENT:
		val->intval = battery->present;
		break;
	case POWER_SUPPLY_PROP_TECHNOLOGY:
		val->intval = acpi_battery_technology(battery);
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
		val->intval = battery->design_voltage *
			acpi_battery_vscale(battery) * 1000;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		val->intval = battery->voltage_now *
				acpi_battery_vscale(battery) * 1000;
		break;
	case POWER_SUPPLY_PROP_CURRENT_NOW:
		val->intval = abs(battery->current_now) *
				acpi_battery_ipscale(battery) * 1000;
		break;
	case POWER_SUPPLY_PROP_CURRENT_AVG:
		val->intval = abs(battery->current_avg) *
				acpi_battery_ipscale(battery) * 1000;
		break;
	case POWER_SUPPLY_PROP_CAPACITY:
		val->intval = battery->state_of_charge;
		break;
	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
	case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
		val->intval = battery->design_capacity *
			acpi_battery_scale(battery) * 1000;
		break;
	case POWER_SUPPLY_PROP_CHARGE_FULL:
	case POWER_SUPPLY_PROP_ENERGY_FULL:
		val->intval = battery->full_charge_capacity *
			acpi_battery_scale(battery) * 1000;
		break;
	case POWER_SUPPLY_PROP_CHARGE_NOW:
	case POWER_SUPPLY_PROP_ENERGY_NOW:
		val->intval = battery->capacity_now *
				acpi_battery_scale(battery) * 1000;
		break;
	case POWER_SUPPLY_PROP_TEMP:
		val->intval = battery->temp_now - 2730;	// dK -> dC
		break;
	case POWER_SUPPLY_PROP_MODEL_NAME:
		val->strval = battery->device_name;
		break;
	case POWER_SUPPLY_PROP_MANUFACTURER:
		val->strval = battery->manufacturer_name;
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static enum power_supply_property sbs_ac_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
};

static enum power_supply_property sbs_charge_battery_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_CURRENT_AVG,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
	POWER_SUPPLY_PROP_CHARGE_FULL,
	POWER_SUPPLY_PROP_CHARGE_NOW,
	POWER_SUPPLY_PROP_TEMP,
	POWER_SUPPLY_PROP_MODEL_NAME,
	POWER_SUPPLY_PROP_MANUFACTURER,
};

static enum power_supply_property sbs_energy_battery_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_CURRENT_AVG,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
	POWER_SUPPLY_PROP_ENERGY_FULL,
	POWER_SUPPLY_PROP_ENERGY_NOW,
	POWER_SUPPLY_PROP_TEMP,
	POWER_SUPPLY_PROP_MODEL_NAME,
	POWER_SUPPLY_PROP_MANUFACTURER,
};

/* --------------------------------------------------------------------------
                            Smart Battery System Management
   -------------------------------------------------------------------------- */

struct acpi_battery_reader {
	u8 command;		/* command for battery */
	u8 mode;		/* word or block? */
	size_t offset;		/* offset inside struct acpi_sbs_battery */
};

static struct acpi_battery_reader info_readers[] = {
	{0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
	{0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
	{0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
	{0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
	{0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
	{0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
	{0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
	{0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
	{0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
	{0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
	{0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
};

static struct acpi_battery_reader state_readers[] = {
	{0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
	{0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
	{0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, current_now)},
	{0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, current_avg)},
	{0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
	{0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
	{0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
};

static int acpi_manager_get_info(struct acpi_sbs *sbs)
{
	int result = 0;
	u16 battery_system_info;

	result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
				 0x04, (u8 *)&battery_system_info);
	if (!result)
		sbs->batteries_supported = battery_system_info & 0x000f;
	return result;
}

static int acpi_battery_get_info(struct acpi_battery *battery)
{
	int i, result = 0;

	for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
		result = acpi_smbus_read(battery->sbs->hc,
					 info_readers[i].mode,
					 ACPI_SBS_BATTERY,
					 info_readers[i].command,
					 (u8 *) battery +
						info_readers[i].offset);
		if (result)
			break;
	}
	return result;
}

static int acpi_battery_get_state(struct acpi_battery *battery)
{
	int i, result = 0;

	if (battery->update_time &&
	    time_before(jiffies, battery->update_time +
				msecs_to_jiffies(cache_time)))
		return 0;
	for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
		result = acpi_smbus_read(battery->sbs->hc,
					 state_readers[i].mode,
					 ACPI_SBS_BATTERY,
					 state_readers[i].command,
				         (u8 *)battery +
						state_readers[i].offset);
		if (result)
			goto end;
	}
      end:
	battery->update_time = jiffies;
	return result;
}

#ifdef CONFIG_ACPI_PROCFS

static int acpi_battery_get_alarm(struct acpi_battery *battery)
{
	return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
				 ACPI_SBS_BATTERY, 0x01,
				 (u8 *)&battery->alarm_capacity);
}

static int acpi_battery_set_alarm(struct acpi_battery *battery)
{
	struct acpi_sbs *sbs = battery->sbs;
	u16 value, sel = 1 << (battery->id + 12);

	int ret;


	if (sbs->manager_present) {
		ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
				0x01, (u8 *)&value);
		if (ret)
			goto end;
		if ((value & 0xf000) != sel) {
			value &= 0x0fff;
			value |= sel;
		ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
					 ACPI_SBS_MANAGER,
					 0x01, (u8 *)&value, 2);
		if (ret)
			goto end;
		}
	}
	ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
				0x01, (u8 *)&battery->alarm_capacity, 2);
      end:
	return ret;
}

#endif

static int acpi_ac_get_present(struct acpi_sbs *sbs)
{
	int result;
	u16 status;

	result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
				 0x13, (u8 *) & status);
	if (!result)
		sbs->charger_present = (status >> 15) & 0x1;
	return result;
}

/* --------------------------------------------------------------------------
                              FS Interface (/proc/acpi)
   -------------------------------------------------------------------------- */

#ifdef CONFIG_ACPI_PROCFS
/* Generic Routines */
static int
acpi_sbs_add_fs(struct proc_dir_entry **dir,
		struct proc_dir_entry *parent_dir,
		char *dir_name,
		struct file_operations *info_fops,
		struct file_operations *state_fops,
		struct file_operations *alarm_fops, void *data)
{
	struct proc_dir_entry *entry = NULL;

	if (!*dir) {
		*dir = proc_mkdir(dir_name, parent_dir);
		if (!*dir) {
			return -ENODEV;
		}
		(*dir)->owner = THIS_MODULE;
	}

	/* 'info' [R] */
	if (info_fops) {
		entry = create_proc_entry(ACPI_SBS_FILE_INFO, S_IRUGO, *dir);
		if (entry) {
			entry->proc_fops = info_fops;
			entry->data = data;
			entry->owner = THIS_MODULE;
		}
	}

	/* 'state' [R] */
	if (state_fops) {
		entry = create_proc_entry(ACPI_SBS_FILE_STATE, S_IRUGO, *dir);
		if (entry) {
			entry->proc_fops = state_fops;
			entry->data = data;
			entry->owner = THIS_MODULE;
		}
	}

	/* 'alarm' [R/W] */
	if (alarm_fops) {
		entry = create_proc_entry(ACPI_SBS_FILE_ALARM, S_IRUGO, *dir);
		if (entry) {
			entry->proc_fops = alarm_fops;
			entry->data = data;
			entry->owner = THIS_MODULE;
		}
	}
	return 0;
}

static void
acpi_sbs_remove_fs(struct proc_dir_entry **dir,
			   struct proc_dir_entry *parent_dir)
{
	if (*dir) {
		remove_proc_entry(ACPI_SBS_FILE_INFO, *dir);
		remove_proc_entry(ACPI_SBS_FILE_STATE, *dir);
		remove_proc_entry(ACPI_SBS_FILE_ALARM, *dir);
		remove_proc_entry((*dir)->name, parent_dir);
		*dir = NULL;
	}
}

/* Smart Battery Interface */
static struct proc_dir_entry *acpi_battery_dir = NULL;

static inline char *acpi_battery_units(struct acpi_battery *battery)
{
	return acpi_battery_mode(battery) ? " mWh" : " mAh";
}


static int acpi_battery_read_info(struct seq_file *seq, void *offset)
{
	struct acpi_battery *battery = seq->private;
	struct acpi_sbs *sbs = battery->sbs;
	int result = 0;

	mutex_lock(&sbs->lock);

	seq_printf(seq, "present:                 %s\n",
		   (battery->present) ? "yes" : "no");
	if (!battery->present)
		goto end;

	seq_printf(seq, "design capacity:         %i%s\n",
		   battery->design_capacity * acpi_battery_scale(battery),
		   acpi_battery_units(battery));
	seq_printf(seq, "last full capacity:      %i%s\n",
		   battery->full_charge_capacity * acpi_battery_scale(battery),
		   acpi_battery_units(battery));
	seq_printf(seq, "battery technology:      rechargeable\n");
	seq_printf(seq, "design voltage:          %i mV\n",
		   battery->design_voltage * acpi_battery_vscale(battery));
	seq_printf(seq, "design capacity warning: unknown\n");
	seq_printf(seq, "design capacity low:     unknown\n");
	seq_printf(seq, "capacity granularity 1:  unknown\n");
	seq_printf(seq, "capacity granularity 2:  unknown\n");
	seq_printf(seq, "model number:            %s\n", battery->device_name);
	seq_printf(seq, "serial number:           %i\n",
		   battery->serial_number);
	seq_printf(seq, "battery type:            %s\n",
		   battery->device_chemistry);
	seq_printf(seq, "OEM info:                %s\n",
		   battery->manufacturer_name);
      end:
	mutex_unlock(&sbs->lock);
	return result;
}

static int acpi_battery_info_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_battery_read_info, PDE(inode)->data);
}

static int acpi_battery_read_state(struct seq_file *seq, void *offset)
{
	struct acpi_battery *battery = seq->private;
	struct acpi_sbs *sbs = battery->sbs;
	int result = 0;

	mutex_lock(&sbs->lock);
	seq_printf(seq, "present:                 %s\n",
		   (battery->present) ? "yes" : "no");
	if (!battery->present)
		goto end;

	acpi_battery_get_state(battery);
	seq_printf(seq, "capacity state:          %s\n",
		   (battery->state & 0x0010) ? "critical" : "ok");
	seq_printf(seq, "charging state:          %s\n",
		   (battery->current_now < 0) ? "discharging" :
		   ((battery->current_now > 0) ? "charging" : "charged"));
	seq_printf(seq, "present rate:            %d mA\n",
		   abs(battery->current_now) * acpi_battery_ipscale(battery));
	seq_printf(seq, "remaining capacity:      %i%s\n",
		   battery->capacity_now * acpi_battery_scale(battery),
		   acpi_battery_units(battery));
	seq_printf(seq, "present voltage:         %i mV\n",
		   battery->voltage_now * acpi_battery_vscale(battery));

      end:
	mutex_unlock(&sbs->lock);
	return result;
}

static int acpi_battery_state_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_battery_read_state, PDE(inode)->data);
}

static int acpi_battery_read_alarm(struct seq_file *seq, void *offset)
{
	struct acpi_battery *battery = seq->private;
	struct acpi_sbs *sbs = battery->sbs;
	int result = 0;

	mutex_lock(&sbs->lock);

	if (!battery->present) {
		seq_printf(seq, "present:                 no\n");
		goto end;
	}

	acpi_battery_get_alarm(battery);
	seq_printf(seq, "alarm:                   ");
	if (battery->alarm_capacity)
		seq_printf(seq, "%i%s\n",
			   battery->alarm_capacity *
			   acpi_battery_scale(battery),
			   acpi_battery_units(battery));
	else
		seq_printf(seq, "disabled\n");
      end:
	mutex_unlock(&sbs->lock);
	return result;
}

static ssize_t
acpi_battery_write_alarm(struct file *file, const char __user * buffer,
			 size_t count, loff_t * ppos)
{
	struct seq_file *seq = file->private_data;
	struct acpi_battery *battery = seq->private;
	struct acpi_sbs *sbs = battery->sbs;
	char alarm_string[12] = { '\0' };
	int result = 0;
	mutex_lock(&sbs->lock);
	if (!battery->present) {
		result = -ENODEV;
		goto end;
	}
	if (count > sizeof(alarm_string) - 1) {
		result = -EINVAL;
		goto end;
	}
	if (copy_from_user(alarm_string, buffer, count)) {
		result = -EFAULT;
		goto end;
	}
	alarm_string[count] = 0;
	battery->alarm_capacity = simple_strtoul(alarm_string, NULL, 0) /
					acpi_battery_scale(battery);
	acpi_battery_set_alarm(battery);
      end:
	mutex_unlock(&sbs->lock);
	if (result)
		return result;
	return count;
}

static int acpi_battery_alarm_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_battery_read_alarm, PDE(inode)->data);
}

static struct file_operations acpi_battery_info_fops = {
	.open = acpi_battery_info_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	.owner = THIS_MODULE,
};

static struct file_operations acpi_battery_state_fops = {
	.open = acpi_battery_state_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	.owner = THIS_MODULE,
};

static struct file_operations acpi_battery_alarm_fops = {
	.open = acpi_battery_alarm_open_fs,
	.read = seq_read,
	.write = acpi_battery_write_alarm,
	.llseek = seq_lseek,
	.release = single_release,
	.owner = THIS_MODULE,
};

/* Legacy AC Adapter Interface */

static struct proc_dir_entry *acpi_ac_dir = NULL;

static int acpi_ac_read_state(struct seq_file *seq, void *offset)
{

	struct acpi_sbs *sbs = seq->private;

	mutex_lock(&sbs->lock);

	seq_printf(seq, "state:                   %s\n",
		   sbs->charger_present ? "on-line" : "off-line");

	mutex_unlock(&sbs->lock);
	return 0;
}

static int acpi_ac_state_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_ac_read_state, PDE(inode)->data);
}

static struct file_operations acpi_ac_state_fops = {
	.open = acpi_ac_state_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	.owner = THIS_MODULE,
};

#endif

/* --------------------------------------------------------------------------
                                 Driver Interface
   -------------------------------------------------------------------------- */
static int acpi_battery_read(struct acpi_battery *battery)
{
	int result = 0, saved_present = battery->present;
	u16 state;

	if (battery->sbs->manager_present) {
		result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
				ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
		if (!result)
			battery->present = state & (1 << battery->id);
		state &= 0x0fff;
		state |= 1 << (battery->id + 12);
		acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
				  ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
	} else if (battery->id == 0)
		battery->present = 1;
	if (result || !battery->present)
		return result;

	if (saved_present != battery->present) {
		battery->update_time = 0;
		result = acpi_battery_get_info(battery);
		if (result)
			return result;
	}
	result = acpi_battery_get_state(battery);
	return result;
}

/* Smart Battery */
static int acpi_battery_add(struct acpi_sbs *sbs, int id)
{
	struct acpi_battery *battery = &sbs->battery[id];
	int result;

	battery->id = id;
	battery->sbs = sbs;
	result = acpi_battery_read(battery);
	if (result)
		return result;

	sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
#ifdef CONFIG_ACPI_PROCFS
	acpi_sbs_add_fs(&battery->proc_entry, acpi_battery_dir,
			battery->name, &acpi_battery_info_fops,
			&acpi_battery_state_fops, &acpi_battery_alarm_fops,
			battery);
#endif
	battery->bat.name = battery->name;
	battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
	if (!acpi_battery_mode(battery)) {
		battery->bat.properties = sbs_charge_battery_props;
		battery->bat.num_properties =
		    ARRAY_SIZE(sbs_charge_battery_props);
	} else {
		battery->bat.properties = sbs_energy_battery_props;
		battery->bat.num_properties =
		    ARRAY_SIZE(sbs_energy_battery_props);
	}
	battery->bat.get_property = acpi_sbs_battery_get_property;
	result = power_supply_register(&sbs->device->dev, &battery->bat);
	printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
	       ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
	       battery->name, sbs->battery->present ? "present" : "absent");
	return result;
}

static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
{
	if (sbs->battery[id].bat.dev)
		power_supply_unregister(&sbs->battery[id].bat);
#ifdef CONFIG_ACPI_PROCFS
	if (sbs->battery[id].proc_entry) {
		acpi_sbs_remove_fs(&(sbs->battery[id].proc_entry),
				   acpi_battery_dir);
	}
#endif
}

static int acpi_charger_add(struct acpi_sbs *sbs)
{
	int result;

	result = acpi_ac_get_present(sbs);
	if (result)
		goto end;
#ifdef CONFIG_ACPI_PROCFS
	result = acpi_sbs_add_fs(&sbs->charger_entry, acpi_ac_dir,
				 ACPI_AC_DIR_NAME, NULL,
				 &acpi_ac_state_fops, NULL, sbs);
	if (result)
		goto end;
#endif
	sbs->charger.name = "sbs-charger";
	sbs->charger.type = POWER_SUPPLY_TYPE_MAINS;
	sbs->charger.properties = sbs_ac_props;
	sbs->charger.num_properties = ARRAY_SIZE(sbs_ac_props);
	sbs->charger.get_property = sbs_get_ac_property;
	power_supply_register(&sbs->device->dev, &sbs->charger);
	printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
	       ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
	       ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
      end:
	return result;
}

static void acpi_charger_remove(struct acpi_sbs *sbs)
{
	if (sbs->charger.dev)
		power_supply_unregister(&sbs->charger);
#ifdef CONFIG_ACPI_PROCFS
	if (sbs->charger_entry)
		acpi_sbs_remove_fs(&sbs->charger_entry, acpi_ac_dir);
#endif
}

void acpi_sbs_callback(void *context)
{
	int id;
	struct acpi_sbs *sbs = context;
	struct acpi_battery *bat;
	u8 saved_charger_state = sbs->charger_present;
	u8 saved_battery_state;
	acpi_ac_get_present(sbs);
	if (sbs->charger_present != saved_charger_state) {
#ifdef CONFIG_ACPI_PROC_EVENT
		acpi_bus_generate_proc_event4(ACPI_AC_CLASS, ACPI_AC_DIR_NAME,
					      ACPI_SBS_NOTIFY_STATUS,
					      sbs->charger_present);
#endif
		kobject_uevent(&sbs->charger.dev->kobj, KOBJ_CHANGE);
	}
	if (sbs->manager_present) {
		for (id = 0; id < MAX_SBS_BAT; ++id) {
			if (!(sbs->batteries_supported & (1 << id)))
				continue;
			bat = &sbs->battery[id];
			saved_battery_state = bat->present;
			acpi_battery_read(bat);
			if (saved_battery_state == bat->present)
				continue;
#ifdef CONFIG_ACPI_PROC_EVENT
			acpi_bus_generate_proc_event4(ACPI_BATTERY_CLASS,
						      bat->name,
						      ACPI_SBS_NOTIFY_STATUS,
						      bat->present);
#endif
			kobject_uevent(&bat->bat.dev->kobj, KOBJ_CHANGE);
		}
	}
}

static int acpi_sbs_remove(struct acpi_device *device, int type);

static int acpi_sbs_add(struct acpi_device *device)
{
	struct acpi_sbs *sbs;
	int result = 0;
	int id;

	sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
	if (!sbs) {
		result = -ENOMEM;
		goto end;
	}

	mutex_init(&sbs->lock);

	sbs->hc = acpi_driver_data(device->parent);
	sbs->device = device;
	strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
	strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
	acpi_driver_data(device) = sbs;

	result = acpi_charger_add(sbs);
	if (result)
		goto end;

	result = acpi_manager_get_info(sbs);
	if (!result) {
		sbs->manager_present = 1;
		for (id = 0; id < MAX_SBS_BAT; ++id)
			if ((sbs->batteries_supported & (1 << id)))
				acpi_battery_add(sbs, id);
	} else
		acpi_battery_add(sbs, 0);
	acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
      end:
	if (result)
		acpi_sbs_remove(device, 0);
	return result;
}

static int acpi_sbs_remove(struct acpi_device *device, int type)
{
	struct acpi_sbs *sbs;
	int id;

	if (!device)
		return -EINVAL;
	sbs = acpi_driver_data(device);
	if (!sbs)
		return -EINVAL;
	mutex_lock(&sbs->lock);
	acpi_smbus_unregister_callback(sbs->hc);
	for (id = 0; id < MAX_SBS_BAT; ++id)
		acpi_battery_remove(sbs, id);
	acpi_charger_remove(sbs);
	mutex_unlock(&sbs->lock);
	mutex_destroy(&sbs->lock);
	kfree(sbs);
	return 0;
}

static void acpi_sbs_rmdirs(void)
{
#ifdef CONFIG_ACPI_PROCFS
	if (acpi_ac_dir) {
		acpi_unlock_ac_dir(acpi_ac_dir);
		acpi_ac_dir = NULL;
	}
	if (acpi_battery_dir) {
		acpi_unlock_battery_dir(acpi_battery_dir);
		acpi_battery_dir = NULL;
	}
#endif
}

static int acpi_sbs_resume(struct acpi_device *device)
{
	struct acpi_sbs *sbs;
	if (!device)
		return -EINVAL;
	sbs = device->driver_data;
	acpi_sbs_callback(sbs);
	return 0;
}

static struct acpi_driver acpi_sbs_driver = {
	.name = "sbs",
	.class = ACPI_SBS_CLASS,
	.ids = sbs_device_ids,
	.ops = {
		.add = acpi_sbs_add,
		.remove = acpi_sbs_remove,
		.resume = acpi_sbs_resume,
		},
};

static int __init acpi_sbs_init(void)
{
	int result = 0;

	if (acpi_disabled)
		return -ENODEV;
#ifdef CONFIG_ACPI_PROCFS
	acpi_ac_dir = acpi_lock_ac_dir();
	if (!acpi_ac_dir)
		return -ENODEV;
	acpi_battery_dir = acpi_lock_battery_dir();
	if (!acpi_battery_dir) {
		acpi_sbs_rmdirs();
		return -ENODEV;
	}
#endif
	result = acpi_bus_register_driver(&acpi_sbs_driver);
	if (result < 0) {
		acpi_sbs_rmdirs();
		return -ENODEV;
	}
	return 0;
}

static void __exit acpi_sbs_exit(void)
{
	acpi_bus_unregister_driver(&acpi_sbs_driver);
	acpi_sbs_rmdirs();
	return;
}

module_init(acpi_sbs_init);
module_exit(acpi_sbs_exit);