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
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
|
/*
* Copyright (C) 2011 Samsung Electronics Co., Ltd.
* MyungJoo Ham <myungjoo.ham@samsung.com>
*
* This driver enables to monitor battery health and control charger
* during suspend-to-mem.
* Charger manager depends on other devices. register this later than
* the depending devices.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
**/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/io.h>
#include <linux/module.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/rtc.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/platform_device.h>
#include <linux/power/charger-manager.h>
#include <linux/regulator/consumer.h>
#include <linux/sysfs.h>
#include <linux/of.h>
#include <linux/thermal.h>
/*
* Default termperature threshold for charging.
* Every temperature units are in tenth of centigrade.
*/
#define CM_DEFAULT_RECHARGE_TEMP_DIFF 50
#define CM_DEFAULT_CHARGE_TEMP_MAX 500
static const char * const default_event_names[] = {
[CM_EVENT_UNKNOWN] = "Unknown",
[CM_EVENT_BATT_FULL] = "Battery Full",
[CM_EVENT_BATT_IN] = "Battery Inserted",
[CM_EVENT_BATT_OUT] = "Battery Pulled Out",
[CM_EVENT_BATT_OVERHEAT] = "Battery Overheat",
[CM_EVENT_BATT_COLD] = "Battery Cold",
[CM_EVENT_EXT_PWR_IN_OUT] = "External Power Attach/Detach",
[CM_EVENT_CHG_START_STOP] = "Charging Start/Stop",
[CM_EVENT_OTHERS] = "Other battery events"
};
/*
* Regard CM_JIFFIES_SMALL jiffies is small enough to ignore for
* delayed works so that we can run delayed works with CM_JIFFIES_SMALL
* without any delays.
*/
#define CM_JIFFIES_SMALL (2)
/* If y is valid (> 0) and smaller than x, do x = y */
#define CM_MIN_VALID(x, y) x = (((y > 0) && ((x) > (y))) ? (y) : (x))
/*
* Regard CM_RTC_SMALL (sec) is small enough to ignore error in invoking
* rtc alarm. It should be 2 or larger
*/
#define CM_RTC_SMALL (2)
#define UEVENT_BUF_SIZE 32
static LIST_HEAD(cm_list);
static DEFINE_MUTEX(cm_list_mtx);
/* About in-suspend (suspend-again) monitoring */
static struct alarm *cm_timer;
static bool cm_suspended;
static bool cm_timer_set;
static unsigned long cm_suspend_duration_ms;
/* About normal (not suspended) monitoring */
static unsigned long polling_jiffy = ULONG_MAX; /* ULONG_MAX: no polling */
static unsigned long next_polling; /* Next appointed polling time */
static struct workqueue_struct *cm_wq; /* init at driver add */
static struct delayed_work cm_monitor_work; /* init at driver add */
/**
* is_batt_present - See if the battery presents in place.
* @cm: the Charger Manager representing the battery.
*/
static bool is_batt_present(struct charger_manager *cm)
{
union power_supply_propval val;
struct power_supply *psy;
bool present = false;
int i, ret;
switch (cm->desc->battery_present) {
case CM_BATTERY_PRESENT:
present = true;
break;
case CM_NO_BATTERY:
break;
case CM_FUEL_GAUGE:
psy = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
if (!psy)
break;
ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_PRESENT,
&val);
if (ret == 0 && val.intval)
present = true;
power_supply_put(psy);
break;
case CM_CHARGER_STAT:
for (i = 0; cm->desc->psy_charger_stat[i]; i++) {
psy = power_supply_get_by_name(
cm->desc->psy_charger_stat[i]);
if (!psy) {
dev_err(cm->dev, "Cannot find power supply \"%s\"\n",
cm->desc->psy_charger_stat[i]);
continue;
}
ret = power_supply_get_property(psy,
POWER_SUPPLY_PROP_PRESENT, &val);
power_supply_put(psy);
if (ret == 0 && val.intval) {
present = true;
break;
}
}
break;
}
return present;
}
/**
* is_ext_pwr_online - See if an external power source is attached to charge
* @cm: the Charger Manager representing the battery.
*
* Returns true if at least one of the chargers of the battery has an external
* power source attached to charge the battery regardless of whether it is
* actually charging or not.
*/
static bool is_ext_pwr_online(struct charger_manager *cm)
{
union power_supply_propval val;
struct power_supply *psy;
bool online = false;
int i, ret;
/* If at least one of them has one, it's yes. */
for (i = 0; cm->desc->psy_charger_stat[i]; i++) {
psy = power_supply_get_by_name(cm->desc->psy_charger_stat[i]);
if (!psy) {
dev_err(cm->dev, "Cannot find power supply \"%s\"\n",
cm->desc->psy_charger_stat[i]);
continue;
}
ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_ONLINE,
&val);
power_supply_put(psy);
if (ret == 0 && val.intval) {
online = true;
break;
}
}
return online;
}
/**
* get_batt_uV - Get the voltage level of the battery
* @cm: the Charger Manager representing the battery.
* @uV: the voltage level returned.
*
* Returns 0 if there is no error.
* Returns a negative value on error.
*/
static int get_batt_uV(struct charger_manager *cm, int *uV)
{
union power_supply_propval val;
struct power_supply *fuel_gauge;
int ret;
fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
if (!fuel_gauge)
return -ENODEV;
ret = power_supply_get_property(fuel_gauge,
POWER_SUPPLY_PROP_VOLTAGE_NOW, &val);
power_supply_put(fuel_gauge);
if (ret)
return ret;
*uV = val.intval;
return 0;
}
/**
* is_charging - Returns true if the battery is being charged.
* @cm: the Charger Manager representing the battery.
*/
static bool is_charging(struct charger_manager *cm)
{
int i, ret;
bool charging = false;
struct power_supply *psy;
union power_supply_propval val;
/* If there is no battery, it cannot be charged */
if (!is_batt_present(cm))
return false;
/* If at least one of the charger is charging, return yes */
for (i = 0; cm->desc->psy_charger_stat[i]; i++) {
/* 1. The charger sholuld not be DISABLED */
if (cm->emergency_stop)
continue;
if (!cm->charger_enabled)
continue;
psy = power_supply_get_by_name(cm->desc->psy_charger_stat[i]);
if (!psy) {
dev_err(cm->dev, "Cannot find power supply \"%s\"\n",
cm->desc->psy_charger_stat[i]);
continue;
}
/* 2. The charger should be online (ext-power) */
ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_ONLINE,
&val);
if (ret) {
dev_warn(cm->dev, "Cannot read ONLINE value from %s\n",
cm->desc->psy_charger_stat[i]);
power_supply_put(psy);
continue;
}
if (val.intval == 0) {
power_supply_put(psy);
continue;
}
/*
* 3. The charger should not be FULL, DISCHARGING,
* or NOT_CHARGING.
*/
ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_STATUS,
&val);
power_supply_put(psy);
if (ret) {
dev_warn(cm->dev, "Cannot read STATUS value from %s\n",
cm->desc->psy_charger_stat[i]);
continue;
}
if (val.intval == POWER_SUPPLY_STATUS_FULL ||
val.intval == POWER_SUPPLY_STATUS_DISCHARGING ||
val.intval == POWER_SUPPLY_STATUS_NOT_CHARGING)
continue;
/* Then, this is charging. */
charging = true;
break;
}
return charging;
}
/**
* is_full_charged - Returns true if the battery is fully charged.
* @cm: the Charger Manager representing the battery.
*/
static bool is_full_charged(struct charger_manager *cm)
{
struct charger_desc *desc = cm->desc;
union power_supply_propval val;
struct power_supply *fuel_gauge;
bool is_full = false;
int ret = 0;
int uV;
/* If there is no battery, it cannot be charged */
if (!is_batt_present(cm))
return false;
fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
if (!fuel_gauge)
return false;
if (desc->fullbatt_full_capacity > 0) {
val.intval = 0;
/* Not full if capacity of fuel gauge isn't full */
ret = power_supply_get_property(fuel_gauge,
POWER_SUPPLY_PROP_CHARGE_FULL, &val);
if (!ret && val.intval > desc->fullbatt_full_capacity) {
is_full = true;
goto out;
}
}
/* Full, if it's over the fullbatt voltage */
if (desc->fullbatt_uV > 0) {
ret = get_batt_uV(cm, &uV);
if (!ret && uV >= desc->fullbatt_uV) {
is_full = true;
goto out;
}
}
/* Full, if the capacity is more than fullbatt_soc */
if (desc->fullbatt_soc > 0) {
val.intval = 0;
ret = power_supply_get_property(fuel_gauge,
POWER_SUPPLY_PROP_CAPACITY, &val);
if (!ret && val.intval >= desc->fullbatt_soc) {
is_full = true;
goto out;
}
}
out:
power_supply_put(fuel_gauge);
return is_full;
}
/**
* is_polling_required - Return true if need to continue polling for this CM.
* @cm: the Charger Manager representing the battery.
*/
static bool is_polling_required(struct charger_manager *cm)
{
switch (cm->desc->polling_mode) {
case CM_POLL_DISABLE:
return false;
case CM_POLL_ALWAYS:
return true;
case CM_POLL_EXTERNAL_POWER_ONLY:
return is_ext_pwr_online(cm);
case CM_POLL_CHARGING_ONLY:
return is_charging(cm);
default:
dev_warn(cm->dev, "Incorrect polling_mode (%d)\n",
cm->desc->polling_mode);
}
return false;
}
/**
* try_charger_enable - Enable/Disable chargers altogether
* @cm: the Charger Manager representing the battery.
* @enable: true: enable / false: disable
*
* Note that Charger Manager keeps the charger enabled regardless whether
* the charger is charging or not (because battery is full or no external
* power source exists) except when CM needs to disable chargers forcibly
* bacause of emergency causes; when the battery is overheated or too cold.
*/
static int try_charger_enable(struct charger_manager *cm, bool enable)
{
int err = 0, i;
struct charger_desc *desc = cm->desc;
/* Ignore if it's redundant command */
if (enable == cm->charger_enabled)
return 0;
if (enable) {
if (cm->emergency_stop)
return -EAGAIN;
/*
* Save start time of charging to limit
* maximum possible charging time.
*/
cm->charging_start_time = ktime_to_ms(ktime_get());
cm->charging_end_time = 0;
for (i = 0 ; i < desc->num_charger_regulators ; i++) {
if (desc->charger_regulators[i].externally_control)
continue;
err = regulator_enable(desc->charger_regulators[i].consumer);
if (err < 0) {
dev_warn(cm->dev, "Cannot enable %s regulator\n",
desc->charger_regulators[i].regulator_name);
}
}
} else {
/*
* Save end time of charging to maintain fully charged state
* of battery after full-batt.
*/
cm->charging_start_time = 0;
cm->charging_end_time = ktime_to_ms(ktime_get());
for (i = 0 ; i < desc->num_charger_regulators ; i++) {
if (desc->charger_regulators[i].externally_control)
continue;
err = regulator_disable(desc->charger_regulators[i].consumer);
if (err < 0) {
dev_warn(cm->dev, "Cannot disable %s regulator\n",
desc->charger_regulators[i].regulator_name);
}
}
/*
* Abnormal battery state - Stop charging forcibly,
* even if charger was enabled at the other places
*/
for (i = 0; i < desc->num_charger_regulators; i++) {
if (regulator_is_enabled(
desc->charger_regulators[i].consumer)) {
regulator_force_disable(
desc->charger_regulators[i].consumer);
dev_warn(cm->dev, "Disable regulator(%s) forcibly\n",
desc->charger_regulators[i].regulator_name);
}
}
}
if (!err)
cm->charger_enabled = enable;
return err;
}
/**
* try_charger_restart - Restart charging.
* @cm: the Charger Manager representing the battery.
*
* Restart charging by turning off and on the charger.
*/
static int try_charger_restart(struct charger_manager *cm)
{
int err;
if (cm->emergency_stop)
return -EAGAIN;
err = try_charger_enable(cm, false);
if (err)
return err;
return try_charger_enable(cm, true);
}
/**
* uevent_notify - Let users know something has changed.
* @cm: the Charger Manager representing the battery.
* @event: the event string.
*
* If @event is null, it implies that uevent_notify is called
* by resume function. When called in the resume function, cm_suspended
* should be already reset to false in order to let uevent_notify
* notify the recent event during the suspend to users. While
* suspended, uevent_notify does not notify users, but tracks
* events so that uevent_notify can notify users later after resumed.
*/
static void uevent_notify(struct charger_manager *cm, const char *event)
{
static char env_str[UEVENT_BUF_SIZE + 1] = "";
static char env_str_save[UEVENT_BUF_SIZE + 1] = "";
if (cm_suspended) {
/* Nothing in suspended-event buffer */
if (env_str_save[0] == 0) {
if (!strncmp(env_str, event, UEVENT_BUF_SIZE))
return; /* status not changed */
strncpy(env_str_save, event, UEVENT_BUF_SIZE);
return;
}
if (!strncmp(env_str_save, event, UEVENT_BUF_SIZE))
return; /* Duplicated. */
strncpy(env_str_save, event, UEVENT_BUF_SIZE);
return;
}
if (event == NULL) {
/* No messages pending */
if (!env_str_save[0])
return;
strncpy(env_str, env_str_save, UEVENT_BUF_SIZE);
kobject_uevent(&cm->dev->kobj, KOBJ_CHANGE);
env_str_save[0] = 0;
return;
}
/* status not changed */
if (!strncmp(env_str, event, UEVENT_BUF_SIZE))
return;
/* save the status and notify the update */
strncpy(env_str, event, UEVENT_BUF_SIZE);
kobject_uevent(&cm->dev->kobj, KOBJ_CHANGE);
dev_info(cm->dev, "%s\n", event);
}
/**
* fullbatt_vchk - Check voltage drop some times after "FULL" event.
* @work: the work_struct appointing the function
*
* If a user has designated "fullbatt_vchkdrop_ms/uV" values with
* charger_desc, Charger Manager checks voltage drop after the battery
* "FULL" event. It checks whether the voltage has dropped more than
* fullbatt_vchkdrop_uV by calling this function after fullbatt_vchkrop_ms.
*/
static void fullbatt_vchk(struct work_struct *work)
{
struct delayed_work *dwork = to_delayed_work(work);
struct charger_manager *cm = container_of(dwork,
struct charger_manager, fullbatt_vchk_work);
struct charger_desc *desc = cm->desc;
int batt_uV, err, diff;
/* remove the appointment for fullbatt_vchk */
cm->fullbatt_vchk_jiffies_at = 0;
if (!desc->fullbatt_vchkdrop_uV || !desc->fullbatt_vchkdrop_ms)
return;
err = get_batt_uV(cm, &batt_uV);
if (err) {
dev_err(cm->dev, "%s: get_batt_uV error(%d)\n", __func__, err);
return;
}
diff = desc->fullbatt_uV - batt_uV;
if (diff < 0)
return;
dev_info(cm->dev, "VBATT dropped %duV after full-batt\n", diff);
if (diff > desc->fullbatt_vchkdrop_uV) {
try_charger_restart(cm);
uevent_notify(cm, "Recharging");
}
}
/**
* check_charging_duration - Monitor charging/discharging duration
* @cm: the Charger Manager representing the battery.
*
* If whole charging duration exceed 'charging_max_duration_ms',
* cm stop charging to prevent overcharge/overheat. If discharging
* duration exceed 'discharging _max_duration_ms', charger cable is
* attached, after full-batt, cm start charging to maintain fully
* charged state for battery.
*/
static int check_charging_duration(struct charger_manager *cm)
{
struct charger_desc *desc = cm->desc;
u64 curr = ktime_to_ms(ktime_get());
u64 duration;
int ret = false;
if (!desc->charging_max_duration_ms &&
!desc->discharging_max_duration_ms)
return ret;
if (cm->charger_enabled) {
duration = curr - cm->charging_start_time;
if (duration > desc->charging_max_duration_ms) {
dev_info(cm->dev, "Charging duration exceed %ums\n",
desc->charging_max_duration_ms);
uevent_notify(cm, "Discharging");
try_charger_enable(cm, false);
ret = true;
}
} else if (is_ext_pwr_online(cm) && !cm->charger_enabled) {
duration = curr - cm->charging_end_time;
if (duration > desc->discharging_max_duration_ms &&
is_ext_pwr_online(cm)) {
dev_info(cm->dev, "Discharging duration exceed %ums\n",
desc->discharging_max_duration_ms);
uevent_notify(cm, "Recharging");
try_charger_enable(cm, true);
ret = true;
}
}
return ret;
}
static int cm_get_battery_temperature_by_psy(struct charger_manager *cm,
int *temp)
{
struct power_supply *fuel_gauge;
int ret;
fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
if (!fuel_gauge)
return -ENODEV;
ret = power_supply_get_property(fuel_gauge,
POWER_SUPPLY_PROP_TEMP,
(union power_supply_propval *)temp);
power_supply_put(fuel_gauge);
return ret;
}
static int cm_get_battery_temperature(struct charger_manager *cm,
int *temp)
{
int ret;
if (!cm->desc->measure_battery_temp)
return -ENODEV;
#ifdef CONFIG_THERMAL
if (cm->tzd_batt) {
ret = thermal_zone_get_temp(cm->tzd_batt, temp);
if (!ret)
/* Calibrate temperature unit */
*temp /= 100;
} else
#endif
{
/* if-else continued from CONFIG_THERMAL */
ret = cm_get_battery_temperature_by_psy(cm, temp);
}
return ret;
}
static int cm_check_thermal_status(struct charger_manager *cm)
{
struct charger_desc *desc = cm->desc;
int temp, upper_limit, lower_limit;
int ret = 0;
ret = cm_get_battery_temperature(cm, &temp);
if (ret) {
/* FIXME:
* No information of battery temperature might
* occur hazadous result. We have to handle it
* depending on battery type.
*/
dev_err(cm->dev, "Failed to get battery temperature\n");
return 0;
}
upper_limit = desc->temp_max;
lower_limit = desc->temp_min;
if (cm->emergency_stop) {
upper_limit -= desc->temp_diff;
lower_limit += desc->temp_diff;
}
if (temp > upper_limit)
ret = CM_EVENT_BATT_OVERHEAT;
else if (temp < lower_limit)
ret = CM_EVENT_BATT_COLD;
return ret;
}
/**
* _cm_monitor - Monitor the temperature and return true for exceptions.
* @cm: the Charger Manager representing the battery.
*
* Returns true if there is an event to notify for the battery.
* (True if the status of "emergency_stop" changes)
*/
static bool _cm_monitor(struct charger_manager *cm)
{
int temp_alrt;
temp_alrt = cm_check_thermal_status(cm);
/* It has been stopped already */
if (temp_alrt && cm->emergency_stop)
return false;
/*
* Check temperature whether overheat or cold.
* If temperature is out of range normal state, stop charging.
*/
if (temp_alrt) {
cm->emergency_stop = temp_alrt;
if (!try_charger_enable(cm, false))
uevent_notify(cm, default_event_names[temp_alrt]);
/*
* Check whole charging duration and discharing duration
* after full-batt.
*/
} else if (!cm->emergency_stop && check_charging_duration(cm)) {
dev_dbg(cm->dev,
"Charging/Discharging duration is out of range\n");
/*
* Check dropped voltage of battery. If battery voltage is more
* dropped than fullbatt_vchkdrop_uV after fully charged state,
* charger-manager have to recharge battery.
*/
} else if (!cm->emergency_stop && is_ext_pwr_online(cm) &&
!cm->charger_enabled) {
fullbatt_vchk(&cm->fullbatt_vchk_work.work);
/*
* Check whether fully charged state to protect overcharge
* if charger-manager is charging for battery.
*/
} else if (!cm->emergency_stop && is_full_charged(cm) &&
cm->charger_enabled) {
dev_info(cm->dev, "EVENT_HANDLE: Battery Fully Charged\n");
uevent_notify(cm, default_event_names[CM_EVENT_BATT_FULL]);
try_charger_enable(cm, false);
fullbatt_vchk(&cm->fullbatt_vchk_work.work);
} else {
cm->emergency_stop = 0;
if (is_ext_pwr_online(cm)) {
if (!try_charger_enable(cm, true))
uevent_notify(cm, "CHARGING");
}
}
return true;
}
/**
* cm_monitor - Monitor every battery.
*
* Returns true if there is an event to notify from any of the batteries.
* (True if the status of "emergency_stop" changes)
*/
static bool cm_monitor(void)
{
bool stop = false;
struct charger_manager *cm;
mutex_lock(&cm_list_mtx);
list_for_each_entry(cm, &cm_list, entry) {
if (_cm_monitor(cm))
stop = true;
}
mutex_unlock(&cm_list_mtx);
return stop;
}
/**
* _setup_polling - Setup the next instance of polling.
* @work: work_struct of the function _setup_polling.
*/
static void _setup_polling(struct work_struct *work)
{
unsigned long min = ULONG_MAX;
struct charger_manager *cm;
bool keep_polling = false;
unsigned long _next_polling;
mutex_lock(&cm_list_mtx);
list_for_each_entry(cm, &cm_list, entry) {
if (is_polling_required(cm) && cm->desc->polling_interval_ms) {
keep_polling = true;
if (min > cm->desc->polling_interval_ms)
min = cm->desc->polling_interval_ms;
}
}
polling_jiffy = msecs_to_jiffies(min);
if (polling_jiffy <= CM_JIFFIES_SMALL)
polling_jiffy = CM_JIFFIES_SMALL + 1;
if (!keep_polling)
polling_jiffy = ULONG_MAX;
if (polling_jiffy == ULONG_MAX)
goto out;
WARN(cm_wq == NULL, "charger-manager: workqueue not initialized"
". try it later. %s\n", __func__);
/*
* Use mod_delayed_work() iff the next polling interval should
* occur before the currently scheduled one. If @cm_monitor_work
* isn't active, the end result is the same, so no need to worry
* about stale @next_polling.
*/
_next_polling = jiffies + polling_jiffy;
if (time_before(_next_polling, next_polling)) {
mod_delayed_work(cm_wq, &cm_monitor_work, polling_jiffy);
next_polling = _next_polling;
} else {
if (queue_delayed_work(cm_wq, &cm_monitor_work, polling_jiffy))
next_polling = _next_polling;
}
out:
mutex_unlock(&cm_list_mtx);
}
static DECLARE_WORK(setup_polling, _setup_polling);
/**
* cm_monitor_poller - The Monitor / Poller.
* @work: work_struct of the function cm_monitor_poller
*
* During non-suspended state, cm_monitor_poller is used to poll and monitor
* the batteries.
*/
static void cm_monitor_poller(struct work_struct *work)
{
cm_monitor();
schedule_work(&setup_polling);
}
/**
* fullbatt_handler - Event handler for CM_EVENT_BATT_FULL
* @cm: the Charger Manager representing the battery.
*/
static void fullbatt_handler(struct charger_manager *cm)
{
struct charger_desc *desc = cm->desc;
if (!desc->fullbatt_vchkdrop_uV || !desc->fullbatt_vchkdrop_ms)
goto out;
if (cm_suspended)
device_set_wakeup_capable(cm->dev, true);
mod_delayed_work(cm_wq, &cm->fullbatt_vchk_work,
msecs_to_jiffies(desc->fullbatt_vchkdrop_ms));
cm->fullbatt_vchk_jiffies_at = jiffies + msecs_to_jiffies(
desc->fullbatt_vchkdrop_ms);
if (cm->fullbatt_vchk_jiffies_at == 0)
cm->fullbatt_vchk_jiffies_at = 1;
out:
dev_info(cm->dev, "EVENT_HANDLE: Battery Fully Charged\n");
uevent_notify(cm, default_event_names[CM_EVENT_BATT_FULL]);
}
/**
* battout_handler - Event handler for CM_EVENT_BATT_OUT
* @cm: the Charger Manager representing the battery.
*/
static void battout_handler(struct charger_manager *cm)
{
if (cm_suspended)
device_set_wakeup_capable(cm->dev, true);
if (!is_batt_present(cm)) {
dev_emerg(cm->dev, "Battery Pulled Out!\n");
uevent_notify(cm, default_event_names[CM_EVENT_BATT_OUT]);
} else {
uevent_notify(cm, "Battery Reinserted?");
}
}
/**
* misc_event_handler - Handler for other evnets
* @cm: the Charger Manager representing the battery.
* @type: the Charger Manager representing the battery.
*/
static void misc_event_handler(struct charger_manager *cm,
enum cm_event_types type)
{
if (cm_suspended)
device_set_wakeup_capable(cm->dev, true);
if (is_polling_required(cm) && cm->desc->polling_interval_ms)
schedule_work(&setup_polling);
uevent_notify(cm, default_event_names[type]);
}
static int charger_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct charger_manager *cm = power_supply_get_drvdata(psy);
struct charger_desc *desc = cm->desc;
struct power_supply *fuel_gauge = NULL;
int ret = 0;
int uV;
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
if (is_charging(cm))
val->intval = POWER_SUPPLY_STATUS_CHARGING;
else if (is_ext_pwr_online(cm))
val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
else
val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
break;
case POWER_SUPPLY_PROP_HEALTH:
if (cm->emergency_stop > 0)
val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
else if (cm->emergency_stop < 0)
val->intval = POWER_SUPPLY_HEALTH_COLD;
else
val->intval = POWER_SUPPLY_HEALTH_GOOD;
break;
case POWER_SUPPLY_PROP_PRESENT:
if (is_batt_present(cm))
val->intval = 1;
else
val->intval = 0;
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
ret = get_batt_uV(cm, &val->intval);
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
if (!fuel_gauge) {
ret = -ENODEV;
break;
}
ret = power_supply_get_property(fuel_gauge,
POWER_SUPPLY_PROP_CURRENT_NOW, val);
break;
case POWER_SUPPLY_PROP_TEMP:
case POWER_SUPPLY_PROP_TEMP_AMBIENT:
return cm_get_battery_temperature(cm, &val->intval);
case POWER_SUPPLY_PROP_CAPACITY:
if (!is_batt_present(cm)) {
/* There is no battery. Assume 100% */
val->intval = 100;
break;
}
fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
if (!fuel_gauge) {
ret = -ENODEV;
break;
}
ret = power_supply_get_property(fuel_gauge,
POWER_SUPPLY_PROP_CAPACITY, val);
if (ret)
break;
if (val->intval > 100) {
val->intval = 100;
break;
}
if (val->intval < 0)
val->intval = 0;
/* Do not adjust SOC when charging: voltage is overrated */
if (is_charging(cm))
break;
/*
* If the capacity value is inconsistent, calibrate it base on
* the battery voltage values and the thresholds given as desc
*/
ret = get_batt_uV(cm, &uV);
if (ret) {
/* Voltage information not available. No calibration */
ret = 0;
break;
}
if (desc->fullbatt_uV > 0 && uV >= desc->fullbatt_uV &&
!is_charging(cm)) {
val->intval = 100;
break;
}
break;
case POWER_SUPPLY_PROP_ONLINE:
if (is_ext_pwr_online(cm))
val->intval = 1;
else
val->intval = 0;
break;
case POWER_SUPPLY_PROP_CHARGE_FULL:
if (is_full_charged(cm))
val->intval = 1;
else
val->intval = 0;
ret = 0;
break;
case POWER_SUPPLY_PROP_CHARGE_NOW:
if (is_charging(cm)) {
fuel_gauge = power_supply_get_by_name(
cm->desc->psy_fuel_gauge);
if (!fuel_gauge) {
ret = -ENODEV;
break;
}
ret = power_supply_get_property(fuel_gauge,
POWER_SUPPLY_PROP_CHARGE_NOW,
val);
if (ret) {
val->intval = 1;
ret = 0;
} else {
/* If CHARGE_NOW is supplied, use it */
val->intval = (val->intval > 0) ?
val->intval : 1;
}
} else {
val->intval = 0;
}
break;
default:
return -EINVAL;
}
if (fuel_gauge)
power_supply_put(fuel_gauge);
return ret;
}
#define NUM_CHARGER_PSY_OPTIONAL (4)
static enum power_supply_property default_charger_props[] = {
/* Guaranteed to provide */
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_CAPACITY,
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_CHARGE_FULL,
/*
* Optional properties are:
* POWER_SUPPLY_PROP_CHARGE_NOW,
* POWER_SUPPLY_PROP_CURRENT_NOW,
* POWER_SUPPLY_PROP_TEMP, and
* POWER_SUPPLY_PROP_TEMP_AMBIENT,
*/
};
static const struct power_supply_desc psy_default = {
.name = "battery",
.type = POWER_SUPPLY_TYPE_BATTERY,
.properties = default_charger_props,
.num_properties = ARRAY_SIZE(default_charger_props),
.get_property = charger_get_property,
.no_thermal = true,
};
/**
* cm_setup_timer - For in-suspend monitoring setup wakeup alarm
* for suspend_again.
*
* Returns true if the alarm is set for Charger Manager to use.
* Returns false if
* cm_setup_timer fails to set an alarm,
* cm_setup_timer does not need to set an alarm for Charger Manager,
* or an alarm previously configured is to be used.
*/
static bool cm_setup_timer(void)
{
struct charger_manager *cm;
unsigned int wakeup_ms = UINT_MAX;
int timer_req = 0;
if (time_after(next_polling, jiffies))
CM_MIN_VALID(wakeup_ms,
jiffies_to_msecs(next_polling - jiffies));
mutex_lock(&cm_list_mtx);
list_for_each_entry(cm, &cm_list, entry) {
unsigned int fbchk_ms = 0;
/* fullbatt_vchk is required. setup timer for that */
if (cm->fullbatt_vchk_jiffies_at) {
fbchk_ms = jiffies_to_msecs(cm->fullbatt_vchk_jiffies_at
- jiffies);
if (time_is_before_eq_jiffies(
cm->fullbatt_vchk_jiffies_at) ||
msecs_to_jiffies(fbchk_ms) < CM_JIFFIES_SMALL) {
fullbatt_vchk(&cm->fullbatt_vchk_work.work);
fbchk_ms = 0;
}
}
CM_MIN_VALID(wakeup_ms, fbchk_ms);
/* Skip if polling is not required for this CM */
if (!is_polling_required(cm) && !cm->emergency_stop)
continue;
timer_req++;
if (cm->desc->polling_interval_ms == 0)
continue;
CM_MIN_VALID(wakeup_ms, cm->desc->polling_interval_ms);
}
mutex_unlock(&cm_list_mtx);
if (timer_req && cm_timer) {
ktime_t now, add;
/*
* Set alarm with the polling interval (wakeup_ms)
* The alarm time should be NOW + CM_RTC_SMALL or later.
*/
if (wakeup_ms == UINT_MAX ||
wakeup_ms < CM_RTC_SMALL * MSEC_PER_SEC)
wakeup_ms = 2 * CM_RTC_SMALL * MSEC_PER_SEC;
pr_info("Charger Manager wakeup timer: %u ms\n", wakeup_ms);
now = ktime_get_boottime();
add = ktime_set(wakeup_ms / MSEC_PER_SEC,
(wakeup_ms % MSEC_PER_SEC) * NSEC_PER_MSEC);
alarm_start(cm_timer, ktime_add(now, add));
cm_suspend_duration_ms = wakeup_ms;
return true;
}
return false;
}
/**
* charger_extcon_work - enable/diable charger according to the state
* of charger cable
*
* @work: work_struct of the function charger_extcon_work.
*/
static void charger_extcon_work(struct work_struct *work)
{
struct charger_cable *cable =
container_of(work, struct charger_cable, wq);
int ret;
if (cable->attached && cable->min_uA != 0 && cable->max_uA != 0) {
ret = regulator_set_current_limit(cable->charger->consumer,
cable->min_uA, cable->max_uA);
if (ret < 0) {
pr_err("Cannot set current limit of %s (%s)\n",
cable->charger->regulator_name, cable->name);
return;
}
pr_info("Set current limit of %s : %duA ~ %duA\n",
cable->charger->regulator_name,
cable->min_uA, cable->max_uA);
}
try_charger_enable(cable->cm, cable->attached);
}
/**
* charger_extcon_notifier - receive the state of charger cable
* when registered cable is attached or detached.
*
* @self: the notifier block of the charger_extcon_notifier.
* @event: the cable state.
* @ptr: the data pointer of notifier block.
*/
static int charger_extcon_notifier(struct notifier_block *self,
unsigned long event, void *ptr)
{
struct charger_cable *cable =
container_of(self, struct charger_cable, nb);
/*
* The newly state of charger cable.
* If cable is attached, cable->attached is true.
*/
cable->attached = event;
/*
* Setup monitoring to check battery state
* when charger cable is attached.
*/
if (cable->attached && is_polling_required(cable->cm)) {
cancel_work_sync(&setup_polling);
schedule_work(&setup_polling);
}
/*
* Setup work for controlling charger(regulator)
* according to charger cable.
*/
schedule_work(&cable->wq);
return NOTIFY_DONE;
}
/**
* charger_extcon_init - register external connector to use it
* as the charger cable
*
* @cm: the Charger Manager representing the battery.
* @cable: the Charger cable representing the external connector.
*/
static int charger_extcon_init(struct charger_manager *cm,
struct charger_cable *cable)
{
int ret;
/*
* Charger manager use Extcon framework to identify
* the charger cable among various external connector
* cable (e.g., TA, USB, MHL, Dock).
*/
INIT_WORK(&cable->wq, charger_extcon_work);
cable->nb.notifier_call = charger_extcon_notifier;
ret = extcon_register_interest(&cable->extcon_dev,
cable->extcon_name, cable->name, &cable->nb);
if (ret < 0) {
pr_info("Cannot register extcon_dev for %s(cable: %s)\n",
cable->extcon_name, cable->name);
}
return ret;
}
/**
* charger_manager_register_extcon - Register extcon device to recevie state
* of charger cable.
* @cm: the Charger Manager representing the battery.
*
* This function support EXTCON(External Connector) subsystem to detect the
* state of charger cables for enabling or disabling charger(regulator) and
* select the charger cable for charging among a number of external cable
* according to policy of H/W board.
*/
static int charger_manager_register_extcon(struct charger_manager *cm)
{
struct charger_desc *desc = cm->desc;
struct charger_regulator *charger;
int ret;
int i;
int j;
for (i = 0; i < desc->num_charger_regulators; i++) {
charger = &desc->charger_regulators[i];
charger->consumer = regulator_get(cm->dev,
charger->regulator_name);
if (IS_ERR(charger->consumer)) {
dev_err(cm->dev, "Cannot find charger(%s)\n",
charger->regulator_name);
return PTR_ERR(charger->consumer);
}
charger->cm = cm;
for (j = 0; j < charger->num_cables; j++) {
struct charger_cable *cable = &charger->cables[j];
ret = charger_extcon_init(cm, cable);
if (ret < 0) {
dev_err(cm->dev, "Cannot initialize charger(%s)\n",
charger->regulator_name);
return ret;
}
cable->charger = charger;
cable->cm = cm;
}
}
return 0;
}
/* help function of sysfs node to control charger(regulator) */
static ssize_t charger_name_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct charger_regulator *charger
= container_of(attr, struct charger_regulator, attr_name);
return sprintf(buf, "%s\n", charger->regulator_name);
}
static ssize_t charger_state_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct charger_regulator *charger
= container_of(attr, struct charger_regulator, attr_state);
int state = 0;
if (!charger->externally_control)
state = regulator_is_enabled(charger->consumer);
return sprintf(buf, "%s\n", state ? "enabled" : "disabled");
}
static ssize_t charger_externally_control_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct charger_regulator *charger = container_of(attr,
struct charger_regulator, attr_externally_control);
return sprintf(buf, "%d\n", charger->externally_control);
}
static ssize_t charger_externally_control_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct charger_regulator *charger
= container_of(attr, struct charger_regulator,
attr_externally_control);
struct charger_manager *cm = charger->cm;
struct charger_desc *desc = cm->desc;
int i;
int ret;
int externally_control;
int chargers_externally_control = 1;
ret = sscanf(buf, "%d", &externally_control);
if (ret == 0) {
ret = -EINVAL;
return ret;
}
if (!externally_control) {
charger->externally_control = 0;
return count;
}
for (i = 0; i < desc->num_charger_regulators; i++) {
if (&desc->charger_regulators[i] != charger &&
!desc->charger_regulators[i].externally_control) {
/*
* At least, one charger is controlled by
* charger-manager
*/
chargers_externally_control = 0;
break;
}
}
if (!chargers_externally_control) {
if (cm->charger_enabled) {
try_charger_enable(charger->cm, false);
charger->externally_control = externally_control;
try_charger_enable(charger->cm, true);
} else {
charger->externally_control = externally_control;
}
} else {
dev_warn(cm->dev,
"'%s' regulator should be controlled in charger-manager because charger-manager must need at least one charger for charging\n",
charger->regulator_name);
}
return count;
}
/**
* charger_manager_register_sysfs - Register sysfs entry for each charger
* @cm: the Charger Manager representing the battery.
*
* This function add sysfs entry for charger(regulator) to control charger from
* user-space. If some development board use one more chargers for charging
* but only need one charger on specific case which is dependent on user
* scenario or hardware restrictions, the user enter 1 or 0(zero) to '/sys/
* class/power_supply/battery/charger.[index]/externally_control'. For example,
* if user enter 1 to 'sys/class/power_supply/battery/charger.[index]/
* externally_control, this charger isn't controlled from charger-manager and
* always stay off state of regulator.
*/
static int charger_manager_register_sysfs(struct charger_manager *cm)
{
struct charger_desc *desc = cm->desc;
struct charger_regulator *charger;
int chargers_externally_control = 1;
char buf[11];
char *str;
int ret;
int i;
/* Create sysfs entry to control charger(regulator) */
for (i = 0; i < desc->num_charger_regulators; i++) {
charger = &desc->charger_regulators[i];
snprintf(buf, 10, "charger.%d", i);
str = devm_kzalloc(cm->dev,
strlen(buf) + 1, GFP_KERNEL);
if (!str)
return -ENOMEM;
strcpy(str, buf);
charger->attrs[0] = &charger->attr_name.attr;
charger->attrs[1] = &charger->attr_state.attr;
charger->attrs[2] = &charger->attr_externally_control.attr;
charger->attrs[3] = NULL;
charger->attr_g.name = str;
charger->attr_g.attrs = charger->attrs;
sysfs_attr_init(&charger->attr_name.attr);
charger->attr_name.attr.name = "name";
charger->attr_name.attr.mode = 0444;
charger->attr_name.show = charger_name_show;
sysfs_attr_init(&charger->attr_state.attr);
charger->attr_state.attr.name = "state";
charger->attr_state.attr.mode = 0444;
charger->attr_state.show = charger_state_show;
sysfs_attr_init(&charger->attr_externally_control.attr);
charger->attr_externally_control.attr.name
= "externally_control";
charger->attr_externally_control.attr.mode = 0644;
charger->attr_externally_control.show
= charger_externally_control_show;
charger->attr_externally_control.store
= charger_externally_control_store;
if (!desc->charger_regulators[i].externally_control ||
!chargers_externally_control)
chargers_externally_control = 0;
dev_info(cm->dev, "'%s' regulator's externally_control is %d\n",
charger->regulator_name, charger->externally_control);
ret = sysfs_create_group(&cm->charger_psy->dev.kobj,
&charger->attr_g);
if (ret < 0) {
dev_err(cm->dev, "Cannot create sysfs entry of %s regulator\n",
charger->regulator_name);
return ret;
}
}
if (chargers_externally_control) {
dev_err(cm->dev, "Cannot register regulator because charger-manager must need at least one charger for charging battery\n");
return -EINVAL;
}
return 0;
}
static int cm_init_thermal_data(struct charger_manager *cm,
struct power_supply *fuel_gauge)
{
struct charger_desc *desc = cm->desc;
union power_supply_propval val;
int ret;
/* Verify whether fuel gauge provides battery temperature */
ret = power_supply_get_property(fuel_gauge,
POWER_SUPPLY_PROP_TEMP, &val);
if (!ret) {
cm->charger_psy_desc.properties[cm->charger_psy_desc.num_properties] =
POWER_SUPPLY_PROP_TEMP;
cm->charger_psy_desc.num_properties++;
cm->desc->measure_battery_temp = true;
}
#ifdef CONFIG_THERMAL
if (ret && desc->thermal_zone) {
cm->tzd_batt =
thermal_zone_get_zone_by_name(desc->thermal_zone);
if (IS_ERR(cm->tzd_batt))
return PTR_ERR(cm->tzd_batt);
/* Use external thermometer */
cm->charger_psy_desc.properties[cm->charger_psy_desc.num_properties] =
POWER_SUPPLY_PROP_TEMP_AMBIENT;
cm->charger_psy_desc.num_properties++;
cm->desc->measure_battery_temp = true;
ret = 0;
}
#endif
if (cm->desc->measure_battery_temp) {
/* NOTICE : Default allowable minimum charge temperature is 0 */
if (!desc->temp_max)
desc->temp_max = CM_DEFAULT_CHARGE_TEMP_MAX;
if (!desc->temp_diff)
desc->temp_diff = CM_DEFAULT_RECHARGE_TEMP_DIFF;
}
return ret;
}
static const struct of_device_id charger_manager_match[] = {
{
.compatible = "charger-manager",
},
{},
};
static struct charger_desc *of_cm_parse_desc(struct device *dev)
{
struct charger_desc *desc;
struct device_node *np = dev->of_node;
u32 poll_mode = CM_POLL_DISABLE;
u32 battery_stat = CM_NO_BATTERY;
int num_chgs = 0;
desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
if (!desc)
return ERR_PTR(-ENOMEM);
of_property_read_string(np, "cm-name", &desc->psy_name);
of_property_read_u32(np, "cm-poll-mode", &poll_mode);
desc->polling_mode = poll_mode;
of_property_read_u32(np, "cm-poll-interval",
&desc->polling_interval_ms);
of_property_read_u32(np, "cm-fullbatt-vchkdrop-ms",
&desc->fullbatt_vchkdrop_ms);
of_property_read_u32(np, "cm-fullbatt-vchkdrop-volt",
&desc->fullbatt_vchkdrop_uV);
of_property_read_u32(np, "cm-fullbatt-voltage", &desc->fullbatt_uV);
of_property_read_u32(np, "cm-fullbatt-soc", &desc->fullbatt_soc);
of_property_read_u32(np, "cm-fullbatt-capacity",
&desc->fullbatt_full_capacity);
of_property_read_u32(np, "cm-battery-stat", &battery_stat);
desc->battery_present = battery_stat;
/* chargers */
of_property_read_u32(np, "cm-num-chargers", &num_chgs);
if (num_chgs) {
int i;
/* Allocate empty bin at the tail of array */
desc->psy_charger_stat = devm_kcalloc(dev,
num_chgs + 1,
sizeof(char *),
GFP_KERNEL);
if (!desc->psy_charger_stat)
return ERR_PTR(-ENOMEM);
for (i = 0; i < num_chgs; i++)
of_property_read_string_index(np, "cm-chargers",
i, &desc->psy_charger_stat[i]);
}
of_property_read_string(np, "cm-fuel-gauge", &desc->psy_fuel_gauge);
of_property_read_string(np, "cm-thermal-zone", &desc->thermal_zone);
of_property_read_u32(np, "cm-battery-cold", &desc->temp_min);
if (of_get_property(np, "cm-battery-cold-in-minus", NULL))
desc->temp_min *= -1;
of_property_read_u32(np, "cm-battery-hot", &desc->temp_max);
of_property_read_u32(np, "cm-battery-temp-diff", &desc->temp_diff);
of_property_read_u32(np, "cm-charging-max",
&desc->charging_max_duration_ms);
of_property_read_u32(np, "cm-discharging-max",
&desc->discharging_max_duration_ms);
/* battery charger regualtors */
desc->num_charger_regulators = of_get_child_count(np);
if (desc->num_charger_regulators) {
struct charger_regulator *chg_regs;
struct device_node *child;
chg_regs = devm_kcalloc(dev,
desc->num_charger_regulators,
sizeof(*chg_regs),
GFP_KERNEL);
if (!chg_regs)
return ERR_PTR(-ENOMEM);
desc->charger_regulators = chg_regs;
for_each_child_of_node(np, child) {
struct charger_cable *cables;
struct device_node *_child;
of_property_read_string(child, "cm-regulator-name",
&chg_regs->regulator_name);
/* charger cables */
chg_regs->num_cables = of_get_child_count(child);
if (chg_regs->num_cables) {
cables = devm_kcalloc(dev,
chg_regs->num_cables,
sizeof(*cables),
GFP_KERNEL);
if (!cables) {
of_node_put(child);
return ERR_PTR(-ENOMEM);
}
chg_regs->cables = cables;
for_each_child_of_node(child, _child) {
of_property_read_string(_child,
"cm-cable-name", &cables->name);
of_property_read_string(_child,
"cm-cable-extcon",
&cables->extcon_name);
of_property_read_u32(_child,
"cm-cable-min",
&cables->min_uA);
of_property_read_u32(_child,
"cm-cable-max",
&cables->max_uA);
cables++;
}
}
chg_regs++;
}
}
return desc;
}
static inline struct charger_desc *cm_get_drv_data(struct platform_device *pdev)
{
if (pdev->dev.of_node)
return of_cm_parse_desc(&pdev->dev);
return dev_get_platdata(&pdev->dev);
}
static enum alarmtimer_restart cm_timer_func(struct alarm *alarm, ktime_t now)
{
cm_timer_set = false;
return ALARMTIMER_NORESTART;
}
static int charger_manager_probe(struct platform_device *pdev)
{
struct charger_desc *desc = cm_get_drv_data(pdev);
struct charger_manager *cm;
int ret, i = 0;
int j = 0;
union power_supply_propval val;
struct power_supply *fuel_gauge;
struct power_supply_config psy_cfg = {};
if (IS_ERR(desc)) {
dev_err(&pdev->dev, "No platform data (desc) found\n");
return PTR_ERR(desc);
}
cm = devm_kzalloc(&pdev->dev, sizeof(*cm), GFP_KERNEL);
if (!cm)
return -ENOMEM;
/* Basic Values. Unspecified are Null or 0 */
cm->dev = &pdev->dev;
cm->desc = desc;
psy_cfg.drv_data = cm;
/* Initialize alarm timer */
if (alarmtimer_get_rtcdev()) {
cm_timer = devm_kzalloc(cm->dev, sizeof(*cm_timer), GFP_KERNEL);
if (!cm_timer)
return -ENOMEM;
alarm_init(cm_timer, ALARM_BOOTTIME, cm_timer_func);
}
/*
* Some of the following do not need to be errors.
* Users may intentionally ignore those features.
*/
if (desc->fullbatt_uV == 0) {
dev_info(&pdev->dev, "Ignoring full-battery voltage threshold as it is not supplied\n");
}
if (!desc->fullbatt_vchkdrop_ms || !desc->fullbatt_vchkdrop_uV) {
dev_info(&pdev->dev, "Disabling full-battery voltage drop checking mechanism as it is not supplied\n");
desc->fullbatt_vchkdrop_ms = 0;
desc->fullbatt_vchkdrop_uV = 0;
}
if (desc->fullbatt_soc == 0) {
dev_info(&pdev->dev, "Ignoring full-battery soc(state of charge) threshold as it is not supplied\n");
}
if (desc->fullbatt_full_capacity == 0) {
dev_info(&pdev->dev, "Ignoring full-battery full capacity threshold as it is not supplied\n");
}
if (!desc->charger_regulators || desc->num_charger_regulators < 1) {
dev_err(&pdev->dev, "charger_regulators undefined\n");
return -EINVAL;
}
if (!desc->psy_charger_stat || !desc->psy_charger_stat[0]) {
dev_err(&pdev->dev, "No power supply defined\n");
return -EINVAL;
}
if (!desc->psy_fuel_gauge) {
dev_err(&pdev->dev, "No fuel gauge power supply defined\n");
return -EINVAL;
}
/* Check if charger's supplies are present at probe */
for (i = 0; desc->psy_charger_stat[i]; i++) {
struct power_supply *psy;
psy = power_supply_get_by_name(desc->psy_charger_stat[i]);
if (!psy) {
dev_err(&pdev->dev, "Cannot find power supply \"%s\"\n",
desc->psy_charger_stat[i]);
return -ENODEV;
}
power_supply_put(psy);
}
if (cm->desc->polling_mode != CM_POLL_DISABLE &&
(desc->polling_interval_ms == 0 ||
msecs_to_jiffies(desc->polling_interval_ms) <= CM_JIFFIES_SMALL)) {
dev_err(&pdev->dev, "polling_interval_ms is too small\n");
return -EINVAL;
}
if (!desc->charging_max_duration_ms ||
!desc->discharging_max_duration_ms) {
dev_info(&pdev->dev, "Cannot limit charging duration checking mechanism to prevent overcharge/overheat and control discharging duration\n");
desc->charging_max_duration_ms = 0;
desc->discharging_max_duration_ms = 0;
}
platform_set_drvdata(pdev, cm);
memcpy(&cm->charger_psy_desc, &psy_default, sizeof(psy_default));
if (!desc->psy_name)
strncpy(cm->psy_name_buf, psy_default.name, PSY_NAME_MAX);
else
strncpy(cm->psy_name_buf, desc->psy_name, PSY_NAME_MAX);
cm->charger_psy_desc.name = cm->psy_name_buf;
/* Allocate for psy properties because they may vary */
cm->charger_psy_desc.properties =
devm_kcalloc(&pdev->dev,
ARRAY_SIZE(default_charger_props) +
NUM_CHARGER_PSY_OPTIONAL,
sizeof(enum power_supply_property), GFP_KERNEL);
if (!cm->charger_psy_desc.properties)
return -ENOMEM;
memcpy(cm->charger_psy_desc.properties, default_charger_props,
sizeof(enum power_supply_property) *
ARRAY_SIZE(default_charger_props));
cm->charger_psy_desc.num_properties = psy_default.num_properties;
/* Find which optional psy-properties are available */
fuel_gauge = power_supply_get_by_name(desc->psy_fuel_gauge);
if (!fuel_gauge) {
dev_err(&pdev->dev, "Cannot find power supply \"%s\"\n",
desc->psy_fuel_gauge);
return -ENODEV;
}
if (!power_supply_get_property(fuel_gauge,
POWER_SUPPLY_PROP_CHARGE_NOW, &val)) {
cm->charger_psy_desc.properties[cm->charger_psy_desc.num_properties] =
POWER_SUPPLY_PROP_CHARGE_NOW;
cm->charger_psy_desc.num_properties++;
}
if (!power_supply_get_property(fuel_gauge,
POWER_SUPPLY_PROP_CURRENT_NOW,
&val)) {
cm->charger_psy_desc.properties[cm->charger_psy_desc.num_properties] =
POWER_SUPPLY_PROP_CURRENT_NOW;
cm->charger_psy_desc.num_properties++;
}
ret = cm_init_thermal_data(cm, fuel_gauge);
if (ret) {
dev_err(&pdev->dev, "Failed to initialize thermal data\n");
cm->desc->measure_battery_temp = false;
}
power_supply_put(fuel_gauge);
INIT_DELAYED_WORK(&cm->fullbatt_vchk_work, fullbatt_vchk);
cm->charger_psy = power_supply_register(&pdev->dev,
&cm->charger_psy_desc,
&psy_cfg);
if (IS_ERR(cm->charger_psy)) {
dev_err(&pdev->dev, "Cannot register charger-manager with name \"%s\"\n",
cm->charger_psy_desc.name);
return PTR_ERR(cm->charger_psy);
}
/* Register extcon device for charger cable */
ret = charger_manager_register_extcon(cm);
if (ret < 0) {
dev_err(&pdev->dev, "Cannot initialize extcon device\n");
goto err_reg_extcon;
}
/* Register sysfs entry for charger(regulator) */
ret = charger_manager_register_sysfs(cm);
if (ret < 0) {
dev_err(&pdev->dev,
"Cannot initialize sysfs entry of regulator\n");
goto err_reg_sysfs;
}
/* Add to the list */
mutex_lock(&cm_list_mtx);
list_add(&cm->entry, &cm_list);
mutex_unlock(&cm_list_mtx);
/*
* Charger-manager is capable of waking up the systme from sleep
* when event is happened through cm_notify_event()
*/
device_init_wakeup(&pdev->dev, true);
device_set_wakeup_capable(&pdev->dev, false);
/*
* Charger-manager have to check the charging state right after
* tialization of charger-manager and then update current charging
* state.
*/
cm_monitor();
schedule_work(&setup_polling);
return 0;
err_reg_sysfs:
for (i = 0; i < desc->num_charger_regulators; i++) {
struct charger_regulator *charger;
charger = &desc->charger_regulators[i];
sysfs_remove_group(&cm->charger_psy->dev.kobj,
&charger->attr_g);
}
err_reg_extcon:
for (i = 0; i < desc->num_charger_regulators; i++) {
struct charger_regulator *charger;
charger = &desc->charger_regulators[i];
for (j = 0; j < charger->num_cables; j++) {
struct charger_cable *cable = &charger->cables[j];
/* Remove notifier block if only edev exists */
if (cable->extcon_dev.edev)
extcon_unregister_interest(&cable->extcon_dev);
}
regulator_put(desc->charger_regulators[i].consumer);
}
power_supply_unregister(cm->charger_psy);
return ret;
}
static int charger_manager_remove(struct platform_device *pdev)
{
struct charger_manager *cm = platform_get_drvdata(pdev);
struct charger_desc *desc = cm->desc;
int i = 0;
int j = 0;
/* Remove from the list */
mutex_lock(&cm_list_mtx);
list_del(&cm->entry);
mutex_unlock(&cm_list_mtx);
cancel_work_sync(&setup_polling);
cancel_delayed_work_sync(&cm_monitor_work);
for (i = 0 ; i < desc->num_charger_regulators ; i++) {
struct charger_regulator *charger
= &desc->charger_regulators[i];
for (j = 0 ; j < charger->num_cables ; j++) {
struct charger_cable *cable = &charger->cables[j];
extcon_unregister_interest(&cable->extcon_dev);
}
}
for (i = 0 ; i < desc->num_charger_regulators ; i++)
regulator_put(desc->charger_regulators[i].consumer);
power_supply_unregister(cm->charger_psy);
try_charger_enable(cm, false);
return 0;
}
static const struct platform_device_id charger_manager_id[] = {
{ "charger-manager", 0 },
{ },
};
MODULE_DEVICE_TABLE(platform, charger_manager_id);
static int cm_suspend_noirq(struct device *dev)
{
if (device_may_wakeup(dev)) {
device_set_wakeup_capable(dev, false);
return -EAGAIN;
}
return 0;
}
static bool cm_need_to_awake(void)
{
struct charger_manager *cm;
if (cm_timer)
return false;
mutex_lock(&cm_list_mtx);
list_for_each_entry(cm, &cm_list, entry) {
if (is_charging(cm)) {
mutex_unlock(&cm_list_mtx);
return true;
}
}
mutex_unlock(&cm_list_mtx);
return false;
}
static int cm_suspend_prepare(struct device *dev)
{
struct charger_manager *cm = dev_get_drvdata(dev);
if (cm_need_to_awake())
return -EBUSY;
if (!cm_suspended)
cm_suspended = true;
cm_timer_set = cm_setup_timer();
if (cm_timer_set) {
cancel_work_sync(&setup_polling);
cancel_delayed_work_sync(&cm_monitor_work);
cancel_delayed_work(&cm->fullbatt_vchk_work);
}
return 0;
}
static void cm_suspend_complete(struct device *dev)
{
struct charger_manager *cm = dev_get_drvdata(dev);
if (cm_suspended)
cm_suspended = false;
if (cm_timer_set) {
ktime_t remain;
alarm_cancel(cm_timer);
cm_timer_set = false;
remain = alarm_expires_remaining(cm_timer);
cm_suspend_duration_ms -= ktime_to_ms(remain);
schedule_work(&setup_polling);
}
_cm_monitor(cm);
/* Re-enqueue delayed work (fullbatt_vchk_work) */
if (cm->fullbatt_vchk_jiffies_at) {
unsigned long delay = 0;
unsigned long now = jiffies + CM_JIFFIES_SMALL;
if (time_after_eq(now, cm->fullbatt_vchk_jiffies_at)) {
delay = (unsigned long)((long)now
- (long)(cm->fullbatt_vchk_jiffies_at));
delay = jiffies_to_msecs(delay);
} else {
delay = 0;
}
/*
* Account for cm_suspend_duration_ms with assuming that
* timer stops in suspend.
*/
if (delay > cm_suspend_duration_ms)
delay -= cm_suspend_duration_ms;
else
delay = 0;
queue_delayed_work(cm_wq, &cm->fullbatt_vchk_work,
msecs_to_jiffies(delay));
}
device_set_wakeup_capable(cm->dev, false);
}
static const struct dev_pm_ops charger_manager_pm = {
.prepare = cm_suspend_prepare,
.suspend_noirq = cm_suspend_noirq,
.complete = cm_suspend_complete,
};
static struct platform_driver charger_manager_driver = {
.driver = {
.name = "charger-manager",
.pm = &charger_manager_pm,
.of_match_table = charger_manager_match,
},
.probe = charger_manager_probe,
.remove = charger_manager_remove,
.id_table = charger_manager_id,
};
static int __init charger_manager_init(void)
{
cm_wq = create_freezable_workqueue("charger_manager");
INIT_DELAYED_WORK(&cm_monitor_work, cm_monitor_poller);
return platform_driver_register(&charger_manager_driver);
}
late_initcall(charger_manager_init);
static void __exit charger_manager_cleanup(void)
{
destroy_workqueue(cm_wq);
cm_wq = NULL;
platform_driver_unregister(&charger_manager_driver);
}
module_exit(charger_manager_cleanup);
/**
* cm_notify_event - charger driver notify Charger Manager of charger event
* @psy: pointer to instance of charger's power_supply
* @type: type of charger event
* @msg: optional message passed to uevent_notify function
*/
void cm_notify_event(struct power_supply *psy, enum cm_event_types type,
char *msg)
{
struct charger_manager *cm;
bool found_power_supply = false;
if (psy == NULL)
return;
mutex_lock(&cm_list_mtx);
list_for_each_entry(cm, &cm_list, entry) {
if (match_string(cm->desc->psy_charger_stat, -1,
psy->desc->name) >= 0) {
found_power_supply = true;
break;
}
}
mutex_unlock(&cm_list_mtx);
if (!found_power_supply)
return;
switch (type) {
case CM_EVENT_BATT_FULL:
fullbatt_handler(cm);
break;
case CM_EVENT_BATT_OUT:
battout_handler(cm);
break;
case CM_EVENT_BATT_IN:
case CM_EVENT_EXT_PWR_IN_OUT ... CM_EVENT_CHG_START_STOP:
misc_event_handler(cm, type);
break;
case CM_EVENT_UNKNOWN:
case CM_EVENT_OTHERS:
uevent_notify(cm, msg ? msg : default_event_names[type]);
break;
default:
dev_err(cm->dev, "%s: type not specified\n", __func__);
break;
}
}
EXPORT_SYMBOL_GPL(cm_notify_event);
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
MODULE_DESCRIPTION("Charger Manager");
MODULE_LICENSE("GPL");
|