summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/battery.c
blob: bdb24d636d9acc9c1a0dedbb2f30c6e2ed381593 (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
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
/*
 *  battery.c - ACPI Battery Driver (Revision: 2.0)
 *
 *  Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
 *  Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  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.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/jiffies.h>
#include <linux/async.h>
#include <linux/dmi.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/suspend.h>
#include <asm/unaligned.h>

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

#include <linux/acpi.h>
#include <linux/power_supply.h>

#include <acpi/battery.h>

#define PREFIX "ACPI: "

#define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF

#define ACPI_BATTERY_DEVICE_NAME	"Battery"

/* Battery power unit: 0 means mW, 1 means mA */
#define ACPI_BATTERY_POWER_UNIT_MA	1

#define ACPI_BATTERY_STATE_DISCHARGING	0x1
#define ACPI_BATTERY_STATE_CHARGING	0x2
#define ACPI_BATTERY_STATE_CRITICAL	0x4

#define _COMPONENT		ACPI_BATTERY_COMPONENT

ACPI_MODULE_NAME("battery");

MODULE_AUTHOR("Paul Diefenbaugh");
MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
MODULE_DESCRIPTION("ACPI Battery Driver");
MODULE_LICENSE("GPL");

static async_cookie_t async_cookie;
static bool battery_driver_registered;
static int battery_bix_broken_package;
static int battery_notification_delay_ms;
static unsigned int cache_time = 1000;
module_param(cache_time, uint, 0644);
MODULE_PARM_DESC(cache_time, "cache time in milliseconds");

#ifdef CONFIG_ACPI_PROCFS_POWER
extern struct proc_dir_entry *acpi_lock_battery_dir(void);
extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);

enum acpi_battery_files {
	info_tag = 0,
	state_tag,
	alarm_tag,
	ACPI_BATTERY_NUMFILES,
};

#endif

static const struct acpi_device_id battery_device_ids[] = {
	{"PNP0C0A", 0},
	{"", 0},
};

MODULE_DEVICE_TABLE(acpi, battery_device_ids);

/* Lists of PMIC ACPI HIDs with an (often better) native battery driver */
static const char * const acpi_battery_blacklist[] = {
	"INT33F4", /* X-Powers AXP288 PMIC */
};

enum {
	ACPI_BATTERY_ALARM_PRESENT,
	ACPI_BATTERY_XINFO_PRESENT,
	ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
	/* On Lenovo Thinkpad models from 2010 and 2011, the power unit
	   switches between mWh and mAh depending on whether the system
	   is running on battery or not.  When mAh is the unit, most
	   reported values are incorrect and need to be adjusted by
	   10000/design_voltage.  Verified on x201, t410, t410s, and x220.
	   Pre-2010 and 2012 models appear to always report in mWh and
	   are thus unaffected (tested with t42, t61, t500, x200, x300,
	   and x230).  Also, in mid-2012 Lenovo issued a BIOS update for
	   the 2011 models that fixes the issue (tested on x220 with a
	   post-1.29 BIOS), but as of Nov. 2012, no such update is
	   available for the 2010 models.  */
	ACPI_BATTERY_QUIRK_THINKPAD_MAH,
	/* for batteries reporting current capacity with design capacity
	 * on a full charge, but showing degradation in full charge cap.
	 */
	ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE,
};

struct acpi_battery {
	struct mutex lock;
	struct mutex sysfs_lock;
	struct power_supply *bat;
	struct power_supply_desc bat_desc;
	struct acpi_device *device;
	struct notifier_block pm_nb;
	struct list_head list;
	unsigned long update_time;
	int revision;
	int rate_now;
	int capacity_now;
	int voltage_now;
	int design_capacity;
	int full_charge_capacity;
	int technology;
	int design_voltage;
	int design_capacity_warning;
	int design_capacity_low;
	int cycle_count;
	int measurement_accuracy;
	int max_sampling_time;
	int min_sampling_time;
	int max_averaging_interval;
	int min_averaging_interval;
	int capacity_granularity_1;
	int capacity_granularity_2;
	int alarm;
	char model_number[32];
	char serial_number[32];
	char type[32];
	char oem_info[32];
	int state;
	int power_unit;
	unsigned long flags;
};

#define to_acpi_battery(x) power_supply_get_drvdata(x)

static inline int acpi_battery_present(struct acpi_battery *battery)
{
	return battery->device->status.battery_present;
}

static int acpi_battery_technology(struct acpi_battery *battery)
{
	if (!strcasecmp("NiCd", battery->type))
		return POWER_SUPPLY_TECHNOLOGY_NiCd;
	if (!strcasecmp("NiMH", battery->type))
		return POWER_SUPPLY_TECHNOLOGY_NiMH;
	if (!strcasecmp("LION", battery->type))
		return POWER_SUPPLY_TECHNOLOGY_LION;
	if (!strncasecmp("LI-ION", battery->type, 6))
		return POWER_SUPPLY_TECHNOLOGY_LION;
	if (!strcasecmp("LiP", battery->type))
		return POWER_SUPPLY_TECHNOLOGY_LIPO;
	return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
}

static int acpi_battery_get_state(struct acpi_battery *battery);

static int acpi_battery_is_charged(struct acpi_battery *battery)
{
	/* charging, discharging or critical low */
	if (battery->state != 0)
		return 0;

	/* battery not reporting charge */
	if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
	    battery->capacity_now == 0)
		return 0;

	/* good batteries update full_charge as the batteries degrade */
	if (battery->full_charge_capacity == battery->capacity_now)
		return 1;

	/* fallback to using design values for broken batteries */
	if (battery->design_capacity == battery->capacity_now)
		return 1;

	/* we don't do any sort of metric based on percentages */
	return 0;
}

static bool acpi_battery_is_degraded(struct acpi_battery *battery)
{
	return battery->full_charge_capacity && battery->design_capacity &&
		battery->full_charge_capacity < battery->design_capacity;
}

static int acpi_battery_get_property(struct power_supply *psy,
				     enum power_supply_property psp,
				     union power_supply_propval *val)
{
	int ret = 0;
	struct acpi_battery *battery = to_acpi_battery(psy);

	if (acpi_battery_present(battery)) {
		/* run battery update only if it is present */
		acpi_battery_get_state(battery);
	} else if (psp != POWER_SUPPLY_PROP_PRESENT)
		return -ENODEV;
	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		if (battery->state & ACPI_BATTERY_STATE_DISCHARGING)
			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
		else if (battery->state & ACPI_BATTERY_STATE_CHARGING)
			val->intval = POWER_SUPPLY_STATUS_CHARGING;
		else if (acpi_battery_is_charged(battery))
			val->intval = POWER_SUPPLY_STATUS_FULL;
		else
			val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
		break;
	case POWER_SUPPLY_PROP_PRESENT:
		val->intval = acpi_battery_present(battery);
		break;
	case POWER_SUPPLY_PROP_TECHNOLOGY:
		val->intval = acpi_battery_technology(battery);
		break;
	case POWER_SUPPLY_PROP_CYCLE_COUNT:
		val->intval = battery->cycle_count;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
		if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
			ret = -ENODEV;
		else
			val->intval = battery->design_voltage * 1000;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
			ret = -ENODEV;
		else
			val->intval = battery->voltage_now * 1000;
		break;
	case POWER_SUPPLY_PROP_CURRENT_NOW:
	case POWER_SUPPLY_PROP_POWER_NOW:
		if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
			ret = -ENODEV;
		else
			val->intval = battery->rate_now * 1000;
		break;
	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
	case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
		if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
			ret = -ENODEV;
		else
			val->intval = battery->design_capacity * 1000;
		break;
	case POWER_SUPPLY_PROP_CHARGE_FULL:
	case POWER_SUPPLY_PROP_ENERGY_FULL:
		if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
			ret = -ENODEV;
		else
			val->intval = battery->full_charge_capacity * 1000;
		break;
	case POWER_SUPPLY_PROP_CHARGE_NOW:
	case POWER_SUPPLY_PROP_ENERGY_NOW:
		if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
			ret = -ENODEV;
		else
			val->intval = battery->capacity_now * 1000;
		break;
	case POWER_SUPPLY_PROP_CAPACITY:
		if (battery->capacity_now && battery->full_charge_capacity)
			val->intval = battery->capacity_now * 100/
					battery->full_charge_capacity;
		else
			val->intval = 0;
		break;
	case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
		if (battery->state & ACPI_BATTERY_STATE_CRITICAL)
			val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
		else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
			(battery->capacity_now <= battery->alarm))
			val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
		else if (acpi_battery_is_charged(battery))
			val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
		else
			val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
		break;
	case POWER_SUPPLY_PROP_MODEL_NAME:
		val->strval = battery->model_number;
		break;
	case POWER_SUPPLY_PROP_MANUFACTURER:
		val->strval = battery->oem_info;
		break;
	case POWER_SUPPLY_PROP_SERIAL_NUMBER:
		val->strval = battery->serial_number;
		break;
	default:
		ret = -EINVAL;
	}
	return ret;
}

static enum power_supply_property charge_battery_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_CYCLE_COUNT,
	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
	POWER_SUPPLY_PROP_CHARGE_FULL,
	POWER_SUPPLY_PROP_CHARGE_NOW,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
	POWER_SUPPLY_PROP_MODEL_NAME,
	POWER_SUPPLY_PROP_MANUFACTURER,
	POWER_SUPPLY_PROP_SERIAL_NUMBER,
};

static enum power_supply_property energy_battery_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_CYCLE_COUNT,
	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_POWER_NOW,
	POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
	POWER_SUPPLY_PROP_ENERGY_FULL,
	POWER_SUPPLY_PROP_ENERGY_NOW,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
	POWER_SUPPLY_PROP_MODEL_NAME,
	POWER_SUPPLY_PROP_MANUFACTURER,
	POWER_SUPPLY_PROP_SERIAL_NUMBER,
};

/* --------------------------------------------------------------------------
                               Battery Management
   -------------------------------------------------------------------------- */
struct acpi_offsets {
	size_t offset;		/* offset inside struct acpi_sbs_battery */
	u8 mode;		/* int or string? */
};

static const struct acpi_offsets state_offsets[] = {
	{offsetof(struct acpi_battery, state), 0},
	{offsetof(struct acpi_battery, rate_now), 0},
	{offsetof(struct acpi_battery, capacity_now), 0},
	{offsetof(struct acpi_battery, voltage_now), 0},
};

static const struct acpi_offsets info_offsets[] = {
	{offsetof(struct acpi_battery, power_unit), 0},
	{offsetof(struct acpi_battery, design_capacity), 0},
	{offsetof(struct acpi_battery, full_charge_capacity), 0},
	{offsetof(struct acpi_battery, technology), 0},
	{offsetof(struct acpi_battery, design_voltage), 0},
	{offsetof(struct acpi_battery, design_capacity_warning), 0},
	{offsetof(struct acpi_battery, design_capacity_low), 0},
	{offsetof(struct acpi_battery, capacity_granularity_1), 0},
	{offsetof(struct acpi_battery, capacity_granularity_2), 0},
	{offsetof(struct acpi_battery, model_number), 1},
	{offsetof(struct acpi_battery, serial_number), 1},
	{offsetof(struct acpi_battery, type), 1},
	{offsetof(struct acpi_battery, oem_info), 1},
};

static const struct acpi_offsets extended_info_offsets[] = {
	{offsetof(struct acpi_battery, revision), 0},
	{offsetof(struct acpi_battery, power_unit), 0},
	{offsetof(struct acpi_battery, design_capacity), 0},
	{offsetof(struct acpi_battery, full_charge_capacity), 0},
	{offsetof(struct acpi_battery, technology), 0},
	{offsetof(struct acpi_battery, design_voltage), 0},
	{offsetof(struct acpi_battery, design_capacity_warning), 0},
	{offsetof(struct acpi_battery, design_capacity_low), 0},
	{offsetof(struct acpi_battery, cycle_count), 0},
	{offsetof(struct acpi_battery, measurement_accuracy), 0},
	{offsetof(struct acpi_battery, max_sampling_time), 0},
	{offsetof(struct acpi_battery, min_sampling_time), 0},
	{offsetof(struct acpi_battery, max_averaging_interval), 0},
	{offsetof(struct acpi_battery, min_averaging_interval), 0},
	{offsetof(struct acpi_battery, capacity_granularity_1), 0},
	{offsetof(struct acpi_battery, capacity_granularity_2), 0},
	{offsetof(struct acpi_battery, model_number), 1},
	{offsetof(struct acpi_battery, serial_number), 1},
	{offsetof(struct acpi_battery, type), 1},
	{offsetof(struct acpi_battery, oem_info), 1},
};

static int extract_package(struct acpi_battery *battery,
			   union acpi_object *package,
			   const struct acpi_offsets *offsets, int num)
{
	int i;
	union acpi_object *element;
	if (package->type != ACPI_TYPE_PACKAGE)
		return -EFAULT;
	for (i = 0; i < num; ++i) {
		if (package->package.count <= i)
			return -EFAULT;
		element = &package->package.elements[i];
		if (offsets[i].mode) {
			u8 *ptr = (u8 *)battery + offsets[i].offset;
			if (element->type == ACPI_TYPE_STRING ||
			    element->type == ACPI_TYPE_BUFFER)
				strncpy(ptr, element->string.pointer, 32);
			else if (element->type == ACPI_TYPE_INTEGER) {
				strncpy(ptr, (u8 *)&element->integer.value,
					sizeof(u64));
				ptr[sizeof(u64)] = 0;
			} else
				*ptr = 0; /* don't have value */
		} else {
			int *x = (int *)((u8 *)battery + offsets[i].offset);
			*x = (element->type == ACPI_TYPE_INTEGER) ?
				element->integer.value : -1;
		}
	}
	return 0;
}

static int acpi_battery_get_status(struct acpi_battery *battery)
{
	if (acpi_bus_get_status(battery->device)) {
		ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
		return -ENODEV;
	}
	return 0;
}


static int extract_battery_info(const int use_bix,
			 struct acpi_battery *battery,
			 const struct acpi_buffer *buffer)
{
	int result = -EFAULT;

	if (use_bix && battery_bix_broken_package)
		result = extract_package(battery, buffer->pointer,
				extended_info_offsets + 1,
				ARRAY_SIZE(extended_info_offsets) - 1);
	else if (use_bix)
		result = extract_package(battery, buffer->pointer,
				extended_info_offsets,
				ARRAY_SIZE(extended_info_offsets));
	else
		result = extract_package(battery, buffer->pointer,
				info_offsets, ARRAY_SIZE(info_offsets));
	if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
		battery->full_charge_capacity = battery->design_capacity;
	if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
	    battery->power_unit && battery->design_voltage) {
		battery->design_capacity = battery->design_capacity *
		    10000 / battery->design_voltage;
		battery->full_charge_capacity = battery->full_charge_capacity *
		    10000 / battery->design_voltage;
		battery->design_capacity_warning =
		    battery->design_capacity_warning *
		    10000 / battery->design_voltage;
		/* Curiously, design_capacity_low, unlike the rest of them,
		   is correct.  */
		/* capacity_granularity_* equal 1 on the systems tested, so
		   it's impossible to tell if they would need an adjustment
		   or not if their values were higher.  */
	}
	if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
	    battery->capacity_now > battery->full_charge_capacity)
		battery->capacity_now = battery->full_charge_capacity;

	return result;
}

static int acpi_battery_get_info(struct acpi_battery *battery)
{
	const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
	int use_bix;
	int result = -ENODEV;

	if (!acpi_battery_present(battery))
		return 0;


	for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) {
		struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
		acpi_status status = AE_ERROR;

		mutex_lock(&battery->lock);
		status = acpi_evaluate_object(battery->device->handle,
					      use_bix ? "_BIX":"_BIF",
					      NULL, &buffer);
		mutex_unlock(&battery->lock);

		if (ACPI_FAILURE(status)) {
			ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s",
					use_bix ? "_BIX":"_BIF"));
		} else {
			result = extract_battery_info(use_bix,
						      battery,
						      &buffer);

			kfree(buffer.pointer);
			break;
		}
	}

	if (!result && !use_bix && xinfo)
		pr_warn(FW_BUG "The _BIX method is broken, using _BIF.\n");

	return result;
}

static int acpi_battery_get_state(struct acpi_battery *battery)
{
	int result = 0;
	acpi_status status = 0;
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };

	if (!acpi_battery_present(battery))
		return 0;

	if (battery->update_time &&
	    time_before(jiffies, battery->update_time +
			msecs_to_jiffies(cache_time)))
		return 0;

	mutex_lock(&battery->lock);
	status = acpi_evaluate_object(battery->device->handle, "_BST",
				      NULL, &buffer);
	mutex_unlock(&battery->lock);

	if (ACPI_FAILURE(status)) {
		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
		return -ENODEV;
	}

	result = extract_package(battery, buffer.pointer,
				 state_offsets, ARRAY_SIZE(state_offsets));
	battery->update_time = jiffies;
	kfree(buffer.pointer);

	/* For buggy DSDTs that report negative 16-bit values for either
	 * charging or discharging current and/or report 0 as 65536
	 * due to bad math.
	 */
	if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
		battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
		(s16)(battery->rate_now) < 0) {
		battery->rate_now = abs((s16)battery->rate_now);
		printk_once(KERN_WARNING FW_BUG
			    "battery: (dis)charge rate invalid.\n");
	}

	if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
	    && battery->capacity_now >= 0 && battery->capacity_now <= 100)
		battery->capacity_now = (battery->capacity_now *
				battery->full_charge_capacity) / 100;
	if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
	    battery->power_unit && battery->design_voltage) {
		battery->capacity_now = battery->capacity_now *
		    10000 / battery->design_voltage;
	}
	if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
	    battery->capacity_now > battery->full_charge_capacity)
		battery->capacity_now = battery->full_charge_capacity;

	return result;
}

static int acpi_battery_set_alarm(struct acpi_battery *battery)
{
	acpi_status status = 0;

	if (!acpi_battery_present(battery) ||
	    !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
		return -ENODEV;

	mutex_lock(&battery->lock);
	status = acpi_execute_simple_method(battery->device->handle, "_BTP",
					    battery->alarm);
	mutex_unlock(&battery->lock);

	if (ACPI_FAILURE(status))
		return -ENODEV;

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
	return 0;
}

static int acpi_battery_init_alarm(struct acpi_battery *battery)
{
	/* See if alarms are supported, and if so, set default */
	if (!acpi_has_method(battery->device->handle, "_BTP")) {
		clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
		return 0;
	}
	set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
	if (!battery->alarm)
		battery->alarm = battery->design_capacity_warning;
	return acpi_battery_set_alarm(battery);
}

static ssize_t acpi_battery_alarm_show(struct device *dev,
					struct device_attribute *attr,
					char *buf)
{
	struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
	return sprintf(buf, "%d\n", battery->alarm * 1000);
}

static ssize_t acpi_battery_alarm_store(struct device *dev,
					struct device_attribute *attr,
					const char *buf, size_t count)
{
	unsigned long x;
	struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
	if (sscanf(buf, "%lu\n", &x) == 1)
		battery->alarm = x/1000;
	if (acpi_battery_present(battery))
		acpi_battery_set_alarm(battery);
	return count;
}

static const struct device_attribute alarm_attr = {
	.attr = {.name = "alarm", .mode = 0644},
	.show = acpi_battery_alarm_show,
	.store = acpi_battery_alarm_store,
};

/*
 * The Battery Hooking API
 *
 * This API is used inside other drivers that need to expose
 * platform-specific behaviour within the generic driver in a
 * generic way.
 *
 */

static LIST_HEAD(acpi_battery_list);
static LIST_HEAD(battery_hook_list);
static DEFINE_MUTEX(hook_mutex);

static void __battery_hook_unregister(struct acpi_battery_hook *hook, int lock)
{
	struct acpi_battery *battery;
	/*
	 * In order to remove a hook, we first need to
	 * de-register all the batteries that are registered.
	 */
	if (lock)
		mutex_lock(&hook_mutex);
	list_for_each_entry(battery, &acpi_battery_list, list) {
		hook->remove_battery(battery->bat);
	}
	list_del(&hook->list);
	if (lock)
		mutex_unlock(&hook_mutex);
	pr_info("extension unregistered: %s\n", hook->name);
}

void battery_hook_unregister(struct acpi_battery_hook *hook)
{
	__battery_hook_unregister(hook, 1);
}
EXPORT_SYMBOL_GPL(battery_hook_unregister);

void battery_hook_register(struct acpi_battery_hook *hook)
{
	struct acpi_battery *battery;

	mutex_lock(&hook_mutex);
	INIT_LIST_HEAD(&hook->list);
	list_add(&hook->list, &battery_hook_list);
	/*
	 * Now that the driver is registered, we need
	 * to notify the hook that a battery is available
	 * for each battery, so that the driver may add
	 * its attributes.
	 */
	list_for_each_entry(battery, &acpi_battery_list, list) {
		if (hook->add_battery(battery->bat)) {
			/*
			 * If a add-battery returns non-zero,
			 * the registration of the extension has failed,
			 * and we will not add it to the list of loaded
			 * hooks.
			 */
			pr_err("extension failed to load: %s", hook->name);
			__battery_hook_unregister(hook, 0);
			return;
		}
	}
	pr_info("new extension: %s\n", hook->name);
	mutex_unlock(&hook_mutex);
}
EXPORT_SYMBOL_GPL(battery_hook_register);

/*
 * This function gets called right after the battery sysfs
 * attributes have been added, so that the drivers that
 * define custom sysfs attributes can add their own.
*/
static void battery_hook_add_battery(struct acpi_battery *battery)
{
	struct acpi_battery_hook *hook_node;

	mutex_lock(&hook_mutex);
	INIT_LIST_HEAD(&battery->list);
	list_add(&battery->list, &acpi_battery_list);
	/*
	 * Since we added a new battery to the list, we need to
	 * iterate over the hooks and call add_battery for each
	 * hook that was registered. This usually happens
	 * when a battery gets hotplugged or initialized
	 * during the battery module initialization.
	 */
	list_for_each_entry(hook_node, &battery_hook_list, list) {
		if (hook_node->add_battery(battery->bat)) {
			/*
			 * The notification of the extensions has failed, to
			 * prevent further errors we will unload the extension.
			 */
			__battery_hook_unregister(hook_node, 0);
			pr_err("error in extension, unloading: %s",
					hook_node->name);
		}
	}
	mutex_unlock(&hook_mutex);
}

static void battery_hook_remove_battery(struct acpi_battery *battery)
{
	struct acpi_battery_hook *hook;

	mutex_lock(&hook_mutex);
	/*
	 * Before removing the hook, we need to remove all
	 * custom attributes from the battery.
	 */
	list_for_each_entry(hook, &battery_hook_list, list) {
		hook->remove_battery(battery->bat);
	}
	/* Then, just remove the battery from the list */
	list_del(&battery->list);
	mutex_unlock(&hook_mutex);
}

static void __exit battery_hook_exit(void)
{
	struct acpi_battery_hook *hook;
	struct acpi_battery_hook *ptr;
	/*
	 * At this point, the acpi_bus_unregister_driver()
	 * has called remove for all batteries. We just
	 * need to remove the hooks.
	 */
	list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) {
		__battery_hook_unregister(hook, 1);
	}
	mutex_destroy(&hook_mutex);
}

static int sysfs_add_battery(struct acpi_battery *battery)
{
	struct power_supply_config psy_cfg = { .drv_data = battery, };

	if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
		battery->bat_desc.properties = charge_battery_props;
		battery->bat_desc.num_properties =
			ARRAY_SIZE(charge_battery_props);
	} else {
		battery->bat_desc.properties = energy_battery_props;
		battery->bat_desc.num_properties =
			ARRAY_SIZE(energy_battery_props);
	}

	battery->bat_desc.name = acpi_device_bid(battery->device);
	battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
	battery->bat_desc.get_property = acpi_battery_get_property;

	battery->bat = power_supply_register_no_ws(&battery->device->dev,
				&battery->bat_desc, &psy_cfg);

	if (IS_ERR(battery->bat)) {
		int result = PTR_ERR(battery->bat);

		battery->bat = NULL;
		return result;
	}
	battery_hook_add_battery(battery);
	return device_create_file(&battery->bat->dev, &alarm_attr);
}

static void sysfs_remove_battery(struct acpi_battery *battery)
{
	mutex_lock(&battery->sysfs_lock);
	if (!battery->bat) {
		mutex_unlock(&battery->sysfs_lock);
		return;
	}
	battery_hook_remove_battery(battery);
	device_remove_file(&battery->bat->dev, &alarm_attr);
	power_supply_unregister(battery->bat);
	battery->bat = NULL;
	mutex_unlock(&battery->sysfs_lock);
}

static void find_battery(const struct dmi_header *dm, void *private)
{
	struct acpi_battery *battery = (struct acpi_battery *)private;
	/* Note: the hardcoded offsets below have been extracted from
	   the source code of dmidecode.  */
	if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) {
		const u8 *dmi_data = (const u8 *)(dm + 1);
		int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6));
		if (dm->length >= 18)
			dmi_capacity *= dmi_data[17];
		if (battery->design_capacity * battery->design_voltage / 1000
		    != dmi_capacity &&
		    battery->design_capacity * 10 == dmi_capacity)
			set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
				&battery->flags);
	}
}

/*
 * According to the ACPI spec, some kinds of primary batteries can
 * report percentage battery remaining capacity directly to OS.
 * In this case, it reports the Last Full Charged Capacity == 100
 * and BatteryPresentRate == 0xFFFFFFFF.
 *
 * Now we found some battery reports percentage remaining capacity
 * even if it's rechargeable.
 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
 *
 * Handle this correctly so that they won't break userspace.
 */
static void acpi_battery_quirks(struct acpi_battery *battery)
{
	if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
		return;

	if (battery->full_charge_capacity == 100 &&
		battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
		battery->capacity_now >= 0 && battery->capacity_now <= 100) {
		set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
		battery->full_charge_capacity = battery->design_capacity;
		battery->capacity_now = (battery->capacity_now *
				battery->full_charge_capacity) / 100;
	}

	if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags))
		return;

	if (battery->power_unit && dmi_name_in_vendors("LENOVO")) {
		const char *s;
		s = dmi_get_system_info(DMI_PRODUCT_VERSION);
		if (s && !strncasecmp(s, "ThinkPad", 8)) {
			dmi_walk(find_battery, battery);
			if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
				     &battery->flags) &&
			    battery->design_voltage) {
				battery->design_capacity =
				    battery->design_capacity *
				    10000 / battery->design_voltage;
				battery->full_charge_capacity =
				    battery->full_charge_capacity *
				    10000 / battery->design_voltage;
				battery->design_capacity_warning =
				    battery->design_capacity_warning *
				    10000 / battery->design_voltage;
				battery->capacity_now = battery->capacity_now *
				    10000 / battery->design_voltage;
			}
		}
	}

	if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags))
		return;

	if (acpi_battery_is_degraded(battery) &&
	    battery->capacity_now > battery->full_charge_capacity) {
		set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags);
		battery->capacity_now = battery->full_charge_capacity;
	}
}

static int acpi_battery_update(struct acpi_battery *battery, bool resume)
{
	int result, old_present = acpi_battery_present(battery);
	result = acpi_battery_get_status(battery);
	if (result)
		return result;
	if (!acpi_battery_present(battery)) {
		sysfs_remove_battery(battery);
		battery->update_time = 0;
		return 0;
	}

	if (resume)
		return 0;

	if (!battery->update_time ||
	    old_present != acpi_battery_present(battery)) {
		result = acpi_battery_get_info(battery);
		if (result)
			return result;
		acpi_battery_init_alarm(battery);
	}

	result = acpi_battery_get_state(battery);
	if (result)
		return result;
	acpi_battery_quirks(battery);

	if (!battery->bat) {
		result = sysfs_add_battery(battery);
		if (result)
			return result;
	}

	/*
	 * Wakeup the system if battery is critical low
	 * or lower than the alarm level
	 */
	if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) ||
	    (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
            (battery->capacity_now <= battery->alarm)))
		acpi_pm_wakeup_event(&battery->device->dev);

	return result;
}

static void acpi_battery_refresh(struct acpi_battery *battery)
{
	int power_unit;

	if (!battery->bat)
		return;

	power_unit = battery->power_unit;

	acpi_battery_get_info(battery);

	if (power_unit == battery->power_unit)
		return;

	/* The battery has changed its reporting units. */
	sysfs_remove_battery(battery);
	sysfs_add_battery(battery);
}

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

#ifdef CONFIG_ACPI_PROCFS_POWER
static struct proc_dir_entry *acpi_battery_dir;

static const char *acpi_battery_units(const struct acpi_battery *battery)
{
	return (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) ?
		"mA" : "mW";
}

static int acpi_battery_print_info(struct seq_file *seq, int result)
{
	struct acpi_battery *battery = seq->private;

	if (result)
		goto end;

	seq_printf(seq, "present:                 %s\n",
		   acpi_battery_present(battery) ? "yes" : "no");
	if (!acpi_battery_present(battery))
		goto end;
	if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
		seq_printf(seq, "design capacity:         unknown\n");
	else
		seq_printf(seq, "design capacity:         %d %sh\n",
			   battery->design_capacity,
			   acpi_battery_units(battery));

	if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
		seq_printf(seq, "last full capacity:      unknown\n");
	else
		seq_printf(seq, "last full capacity:      %d %sh\n",
			   battery->full_charge_capacity,
			   acpi_battery_units(battery));

	seq_printf(seq, "battery technology:      %srechargeable\n",
		   (!battery->technology)?"non-":"");

	if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
		seq_printf(seq, "design voltage:          unknown\n");
	else
		seq_printf(seq, "design voltage:          %d mV\n",
			   battery->design_voltage);
	seq_printf(seq, "design capacity warning: %d %sh\n",
		   battery->design_capacity_warning,
		   acpi_battery_units(battery));
	seq_printf(seq, "design capacity low:     %d %sh\n",
		   battery->design_capacity_low,
		   acpi_battery_units(battery));
	seq_printf(seq, "cycle count:		  %i\n", battery->cycle_count);
	seq_printf(seq, "capacity granularity 1:  %d %sh\n",
		   battery->capacity_granularity_1,
		   acpi_battery_units(battery));
	seq_printf(seq, "capacity granularity 2:  %d %sh\n",
		   battery->capacity_granularity_2,
		   acpi_battery_units(battery));
	seq_printf(seq, "model number:            %s\n", battery->model_number);
	seq_printf(seq, "serial number:           %s\n", battery->serial_number);
	seq_printf(seq, "battery type:            %s\n", battery->type);
	seq_printf(seq, "OEM info:                %s\n", battery->oem_info);
      end:
	if (result)
		seq_printf(seq, "ERROR: Unable to read battery info\n");
	return result;
}

static int acpi_battery_print_state(struct seq_file *seq, int result)
{
	struct acpi_battery *battery = seq->private;

	if (result)
		goto end;

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

	seq_printf(seq, "capacity state:          %s\n",
			(battery->state & 0x04) ? "critical" : "ok");
	if ((battery->state & 0x01) && (battery->state & 0x02))
		seq_printf(seq,
			   "charging state:          charging/discharging\n");
	else if (battery->state & 0x01)
		seq_printf(seq, "charging state:          discharging\n");
	else if (battery->state & 0x02)
		seq_printf(seq, "charging state:          charging\n");
	else
		seq_printf(seq, "charging state:          charged\n");

	if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
		seq_printf(seq, "present rate:            unknown\n");
	else
		seq_printf(seq, "present rate:            %d %s\n",
			   battery->rate_now, acpi_battery_units(battery));

	if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
		seq_printf(seq, "remaining capacity:      unknown\n");
	else
		seq_printf(seq, "remaining capacity:      %d %sh\n",
			   battery->capacity_now, acpi_battery_units(battery));
	if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
		seq_printf(seq, "present voltage:         unknown\n");
	else
		seq_printf(seq, "present voltage:         %d mV\n",
			   battery->voltage_now);
      end:
	if (result)
		seq_printf(seq, "ERROR: Unable to read battery state\n");

	return result;
}

static int acpi_battery_print_alarm(struct seq_file *seq, int result)
{
	struct acpi_battery *battery = seq->private;

	if (result)
		goto end;

	if (!acpi_battery_present(battery)) {
		seq_printf(seq, "present:                 no\n");
		goto end;
	}
	seq_printf(seq, "alarm:                   ");
	if (!battery->alarm)
		seq_printf(seq, "unsupported\n");
	else
		seq_printf(seq, "%u %sh\n", battery->alarm,
				acpi_battery_units(battery));
      end:
	if (result)
		seq_printf(seq, "ERROR: Unable to read battery alarm\n");
	return result;
}

static ssize_t acpi_battery_write_alarm(struct file *file,
					const char __user * buffer,
					size_t count, loff_t * ppos)
{
	int result = 0;
	char alarm_string[12] = { '\0' };
	struct seq_file *m = file->private_data;
	struct acpi_battery *battery = m->private;

	if (!battery || (count > sizeof(alarm_string) - 1))
		return -EINVAL;
	if (!acpi_battery_present(battery)) {
		result = -ENODEV;
		goto end;
	}
	if (copy_from_user(alarm_string, buffer, count)) {
		result = -EFAULT;
		goto end;
	}
	alarm_string[count] = '\0';
	if (kstrtoint(alarm_string, 0, &battery->alarm)) {
		result = -EINVAL;
		goto end;
	}
	result = acpi_battery_set_alarm(battery);
      end:
	if (!result)
		return count;
	return result;
}

typedef int(*print_func)(struct seq_file *seq, int result);

static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
	acpi_battery_print_info,
	acpi_battery_print_state,
	acpi_battery_print_alarm,
};

static int acpi_battery_read(int fid, struct seq_file *seq)
{
	struct acpi_battery *battery = seq->private;
	int result = acpi_battery_update(battery, false);
	return acpi_print_funcs[fid](seq, result);
}

#define DECLARE_FILE_FUNCTIONS(_name) \
static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
{ \
	return acpi_battery_read(_name##_tag, seq); \
} \
static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
{ \
	return single_open(file, acpi_battery_read_##_name, PDE_DATA(inode)); \
}

DECLARE_FILE_FUNCTIONS(info);
DECLARE_FILE_FUNCTIONS(state);
DECLARE_FILE_FUNCTIONS(alarm);

#undef DECLARE_FILE_FUNCTIONS

#define FILE_DESCRIPTION_RO(_name) \
	{ \
	.name = __stringify(_name), \
	.mode = S_IRUGO, \
	.ops = { \
		.open = acpi_battery_##_name##_open_fs, \
		.read = seq_read, \
		.llseek = seq_lseek, \
		.release = single_release, \
		.owner = THIS_MODULE, \
		}, \
	}

#define FILE_DESCRIPTION_RW(_name) \
	{ \
	.name = __stringify(_name), \
	.mode = S_IFREG | S_IRUGO | S_IWUSR, \
	.ops = { \
		.open = acpi_battery_##_name##_open_fs, \
		.read = seq_read, \
		.llseek = seq_lseek, \
		.write = acpi_battery_write_##_name, \
		.release = single_release, \
		.owner = THIS_MODULE, \
		}, \
	}

static const struct battery_file {
	struct file_operations ops;
	umode_t mode;
	const char *name;
} acpi_battery_file[] = {
	FILE_DESCRIPTION_RO(info),
	FILE_DESCRIPTION_RO(state),
	FILE_DESCRIPTION_RW(alarm),
};

#undef FILE_DESCRIPTION_RO
#undef FILE_DESCRIPTION_RW

static int acpi_battery_add_fs(struct acpi_device *device)
{
	struct proc_dir_entry *entry = NULL;
	int i;

	printk(KERN_WARNING PREFIX "Deprecated procfs I/F for battery is loaded,"
			" please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
	if (!acpi_device_dir(device)) {
		acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
						     acpi_battery_dir);
		if (!acpi_device_dir(device))
			return -ENODEV;
	}

	for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
		entry = proc_create_data(acpi_battery_file[i].name,
					 acpi_battery_file[i].mode,
					 acpi_device_dir(device),
					 &acpi_battery_file[i].ops,
					 acpi_driver_data(device));
		if (!entry)
			return -ENODEV;
	}
	return 0;
}

static void acpi_battery_remove_fs(struct acpi_device *device)
{
	int i;
	if (!acpi_device_dir(device))
		return;
	for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
		remove_proc_entry(acpi_battery_file[i].name,
				  acpi_device_dir(device));

	remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
	acpi_device_dir(device) = NULL;
}

#endif

/* --------------------------------------------------------------------------
                                 Driver Interface
   -------------------------------------------------------------------------- */

static void acpi_battery_notify(struct acpi_device *device, u32 event)
{
	struct acpi_battery *battery = acpi_driver_data(device);
	struct power_supply *old;

	if (!battery)
		return;
	old = battery->bat;
	/*
	* On Acer Aspire V5-573G notifications are sometimes triggered too
	* early. For example, when AC is unplugged and notification is
	* triggered, battery state is still reported as "Full", and changes to
	* "Discharging" only after short delay, without any notification.
	*/
	if (battery_notification_delay_ms > 0)
		msleep(battery_notification_delay_ms);
	if (event == ACPI_BATTERY_NOTIFY_INFO)
		acpi_battery_refresh(battery);
	acpi_battery_update(battery, false);
	acpi_bus_generate_netlink_event(device->pnp.device_class,
					dev_name(&device->dev), event,
					acpi_battery_present(battery));
	acpi_notifier_call_chain(device, event, acpi_battery_present(battery));
	/* acpi_battery_update could remove power_supply object */
	if (old && battery->bat)
		power_supply_changed(battery->bat);
}

static int battery_notify(struct notifier_block *nb,
			       unsigned long mode, void *_unused)
{
	struct acpi_battery *battery = container_of(nb, struct acpi_battery,
						    pm_nb);
	int result;

	switch (mode) {
	case PM_POST_HIBERNATION:
	case PM_POST_SUSPEND:
		if (!acpi_battery_present(battery))
			return 0;

		if (!battery->bat) {
			result = acpi_battery_get_info(battery);
			if (result)
				return result;

			result = sysfs_add_battery(battery);
			if (result)
				return result;
		} else
			acpi_battery_refresh(battery);

		acpi_battery_init_alarm(battery);
		acpi_battery_get_state(battery);
		break;
	}

	return 0;
}

static int __init
battery_bix_broken_package_quirk(const struct dmi_system_id *d)
{
	battery_bix_broken_package = 1;
	return 0;
}

static int __init
battery_notification_delay_quirk(const struct dmi_system_id *d)
{
	battery_notification_delay_ms = 1000;
	return 0;
}

static const struct dmi_system_id bat_dmi_table[] __initconst = {
	{
		.callback = battery_bix_broken_package_quirk,
		.ident = "NEC LZ750/LS",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
			DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"),
		},
	},
	{
		.callback = battery_notification_delay_quirk,
		.ident = "Acer Aspire V5-573G",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"),
		},
	},
	{},
};

/*
 * Some machines'(E,G Lenovo Z480) ECs are not stable
 * during boot up and this causes battery driver fails to be
 * probed due to failure of getting battery information
 * from EC sometimes. After several retries, the operation
 * may work. So add retry code here and 20ms sleep between
 * every retries.
 */
static int acpi_battery_update_retry(struct acpi_battery *battery)
{
	int retry, ret;

	for (retry = 5; retry; retry--) {
		ret = acpi_battery_update(battery, false);
		if (!ret)
			break;

		msleep(20);
	}
	return ret;
}

static int acpi_battery_add(struct acpi_device *device)
{
	int result = 0;
	struct acpi_battery *battery = NULL;

	if (!device)
		return -EINVAL;

	if (device->dep_unmet)
		return -EPROBE_DEFER;

	battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
	if (!battery)
		return -ENOMEM;
	battery->device = device;
	strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
	strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
	device->driver_data = battery;
	mutex_init(&battery->lock);
	mutex_init(&battery->sysfs_lock);
	if (acpi_has_method(battery->device->handle, "_BIX"))
		set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);

	result = acpi_battery_update_retry(battery);
	if (result)
		goto fail;

#ifdef CONFIG_ACPI_PROCFS_POWER
	result = acpi_battery_add_fs(device);
	if (result) {
		acpi_battery_remove_fs(device);
		goto fail;
	}
#endif

	printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
		ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
		device->status.battery_present ? "present" : "absent");

	battery->pm_nb.notifier_call = battery_notify;
	register_pm_notifier(&battery->pm_nb);

	device_init_wakeup(&device->dev, 1);

	return result;

fail:
	sysfs_remove_battery(battery);
	mutex_destroy(&battery->lock);
	mutex_destroy(&battery->sysfs_lock);
	kfree(battery);
	return result;
}

static int acpi_battery_remove(struct acpi_device *device)
{
	struct acpi_battery *battery = NULL;

	if (!device || !acpi_driver_data(device))
		return -EINVAL;
	device_init_wakeup(&device->dev, 0);
	battery = acpi_driver_data(device);
	unregister_pm_notifier(&battery->pm_nb);
#ifdef CONFIG_ACPI_PROCFS_POWER
	acpi_battery_remove_fs(device);
#endif
	sysfs_remove_battery(battery);
	mutex_destroy(&battery->lock);
	mutex_destroy(&battery->sysfs_lock);
	kfree(battery);
	return 0;
}

#ifdef CONFIG_PM_SLEEP
/* this is needed to learn about changes made in suspended state */
static int acpi_battery_resume(struct device *dev)
{
	struct acpi_battery *battery;

	if (!dev)
		return -EINVAL;

	battery = acpi_driver_data(to_acpi_device(dev));
	if (!battery)
		return -EINVAL;

	battery->update_time = 0;
	acpi_battery_update(battery, true);
	return 0;
}
#else
#define acpi_battery_resume NULL
#endif

static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);

static struct acpi_driver acpi_battery_driver = {
	.name = "battery",
	.class = ACPI_BATTERY_CLASS,
	.ids = battery_device_ids,
	.flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
	.ops = {
		.add = acpi_battery_add,
		.remove = acpi_battery_remove,
		.notify = acpi_battery_notify,
		},
	.drv.pm = &acpi_battery_pm,
};

static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
{
	unsigned int i;
	int result;

	for (i = 0; i < ARRAY_SIZE(acpi_battery_blacklist); i++)
		if (acpi_dev_present(acpi_battery_blacklist[i], "1", -1)) {
			pr_info(PREFIX ACPI_BATTERY_DEVICE_NAME
				": found native %s PMIC, not loading\n",
				acpi_battery_blacklist[i]);
			return;
		}

	dmi_check_system(bat_dmi_table);

#ifdef CONFIG_ACPI_PROCFS_POWER
	acpi_battery_dir = acpi_lock_battery_dir();
	if (!acpi_battery_dir)
		return;
#endif
	result = acpi_bus_register_driver(&acpi_battery_driver);
#ifdef CONFIG_ACPI_PROCFS_POWER
	if (result < 0)
		acpi_unlock_battery_dir(acpi_battery_dir);
#endif
	battery_driver_registered = (result == 0);
}

static int __init acpi_battery_init(void)
{
	if (acpi_disabled)
		return -ENODEV;

	async_cookie = async_schedule(acpi_battery_init_async, NULL);
	return 0;
}

static void __exit acpi_battery_exit(void)
{
	async_synchronize_cookie(async_cookie + 1);
	if (battery_driver_registered) {
		acpi_bus_unregister_driver(&acpi_battery_driver);
		battery_hook_exit();
	}
#ifdef CONFIG_ACPI_PROCFS_POWER
	if (acpi_battery_dir)
		acpi_unlock_battery_dir(acpi_battery_dir);
#endif
}

module_init(acpi_battery_init);
module_exit(acpi_battery_exit);