summaryrefslogtreecommitdiff
path: root/drivers/hwmon/w83791d.c
blob: b6f2ebf9f9cf54e4648c8772856bbd4f0952d0a7 (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
/*
    w83791d.c - Part of lm_sensors, Linux kernel modules for hardware
                monitoring

    Copyright (C) 2006-2007 Charles Spirakis <bezaur@gmail.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.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/*
    Supports following chips:

    Chip	#vin	#fanin	#pwm	#temp	wchipid	vendid	i2c	ISA
    w83791d	10	5	3	3	0x71	0x5ca3	yes	no

    The w83791d chip appears to be part way between the 83781d and the
    83792d. Thus, this file is derived from both the w83792d.c and
    w83781d.c files.

    The w83791g chip is the same as the w83791d but lead-free.
*/

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-vid.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>

#define NUMBER_OF_VIN		10
#define NUMBER_OF_FANIN		5
#define NUMBER_OF_TEMPIN	3

/* Addresses to scan */
static unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END };

/* Insmod parameters */
I2C_CLIENT_INSMOD_1(w83791d);
I2C_CLIENT_MODULE_PARM(force_subclients, "List of subclient addresses: "
			"{bus, clientaddr, subclientaddr1, subclientaddr2}");

static int reset;
module_param(reset, bool, 0);
MODULE_PARM_DESC(reset, "Set to one to force a hardware chip reset");

static int init;
module_param(init, bool, 0);
MODULE_PARM_DESC(init, "Set to one to force extra software initialization");

/* The W83791D registers */
static const u8 W83791D_REG_IN[NUMBER_OF_VIN] = {
	0x20,			/* VCOREA in DataSheet */
	0x21,			/* VINR0 in DataSheet */
	0x22,			/* +3.3VIN in DataSheet */
	0x23,			/* VDD5V in DataSheet */
	0x24,			/* +12VIN in DataSheet */
	0x25,			/* -12VIN in DataSheet */
	0x26,			/* -5VIN in DataSheet */
	0xB0,			/* 5VSB in DataSheet */
	0xB1,			/* VBAT in DataSheet */
	0xB2			/* VINR1 in DataSheet */
};

static const u8 W83791D_REG_IN_MAX[NUMBER_OF_VIN] = {
	0x2B,			/* VCOREA High Limit in DataSheet */
	0x2D,			/* VINR0 High Limit in DataSheet */
	0x2F,			/* +3.3VIN High Limit in DataSheet */
	0x31,			/* VDD5V High Limit in DataSheet */
	0x33,			/* +12VIN High Limit in DataSheet */
	0x35,			/* -12VIN High Limit in DataSheet */
	0x37,			/* -5VIN High Limit in DataSheet */
	0xB4,			/* 5VSB High Limit in DataSheet */
	0xB6,			/* VBAT High Limit in DataSheet */
	0xB8			/* VINR1 High Limit in DataSheet */
};
static const u8 W83791D_REG_IN_MIN[NUMBER_OF_VIN] = {
	0x2C,			/* VCOREA Low Limit in DataSheet */
	0x2E,			/* VINR0 Low Limit in DataSheet */
	0x30,			/* +3.3VIN Low Limit in DataSheet */
	0x32,			/* VDD5V Low Limit in DataSheet */
	0x34,			/* +12VIN Low Limit in DataSheet */
	0x36,			/* -12VIN Low Limit in DataSheet */
	0x38,			/* -5VIN Low Limit in DataSheet */
	0xB5,			/* 5VSB Low Limit in DataSheet */
	0xB7,			/* VBAT Low Limit in DataSheet */
	0xB9			/* VINR1 Low Limit in DataSheet */
};
static const u8 W83791D_REG_FAN[NUMBER_OF_FANIN] = {
	0x28,			/* FAN 1 Count in DataSheet */
	0x29,			/* FAN 2 Count in DataSheet */
	0x2A,			/* FAN 3 Count in DataSheet */
	0xBA,			/* FAN 4 Count in DataSheet */
	0xBB,			/* FAN 5 Count in DataSheet */
};
static const u8 W83791D_REG_FAN_MIN[NUMBER_OF_FANIN] = {
	0x3B,			/* FAN 1 Count Low Limit in DataSheet */
	0x3C,			/* FAN 2 Count Low Limit in DataSheet */
	0x3D,			/* FAN 3 Count Low Limit in DataSheet */
	0xBC,			/* FAN 4 Count Low Limit in DataSheet */
	0xBD,			/* FAN 5 Count Low Limit in DataSheet */
};

static const u8 W83791D_REG_FAN_CFG[2] = {
	0x84,			/* FAN 1/2 configuration */
	0x95,			/* FAN 3 configuration */
};

static const u8 W83791D_REG_FAN_DIV[3] = {
	0x47,			/* contains FAN1 and FAN2 Divisor */
	0x4b,			/* contains FAN3 Divisor */
	0x5C,			/* contains FAN4 and FAN5 Divisor */
};

#define W83791D_REG_BANK		0x4E
#define W83791D_REG_TEMP2_CONFIG	0xC2
#define W83791D_REG_TEMP3_CONFIG	0xCA

static const u8 W83791D_REG_TEMP1[3] = {
	0x27,			/* TEMP 1 in DataSheet */
	0x39,			/* TEMP 1 Over in DataSheet */
	0x3A,			/* TEMP 1 Hyst in DataSheet */
};

static const u8 W83791D_REG_TEMP_ADD[2][6] = {
	{0xC0,			/* TEMP 2 in DataSheet */
	 0xC1,			/* TEMP 2(0.5 deg) in DataSheet */
	 0xC5,			/* TEMP 2 Over High part in DataSheet */
	 0xC6,			/* TEMP 2 Over Low part in DataSheet */
	 0xC3,			/* TEMP 2 Thyst High part in DataSheet */
	 0xC4},			/* TEMP 2 Thyst Low part in DataSheet */
	{0xC8,			/* TEMP 3 in DataSheet */
	 0xC9,			/* TEMP 3(0.5 deg) in DataSheet */
	 0xCD,			/* TEMP 3 Over High part in DataSheet */
	 0xCE,			/* TEMP 3 Over Low part in DataSheet */
	 0xCB,			/* TEMP 3 Thyst High part in DataSheet */
	 0xCC}			/* TEMP 3 Thyst Low part in DataSheet */
};

#define W83791D_REG_BEEP_CONFIG		0x4D

static const u8 W83791D_REG_BEEP_CTRL[3] = {
	0x56,			/* BEEP Control Register 1 */
	0x57,			/* BEEP Control Register 2 */
	0xA3,			/* BEEP Control Register 3 */
};

#define W83791D_REG_CONFIG		0x40
#define W83791D_REG_VID_FANDIV		0x47
#define W83791D_REG_DID_VID4		0x49
#define W83791D_REG_WCHIPID		0x58
#define W83791D_REG_CHIPMAN		0x4F
#define W83791D_REG_PIN			0x4B
#define W83791D_REG_I2C_SUBADDR		0x4A

#define W83791D_REG_ALARM1 0xA9	/* realtime status register1 */
#define W83791D_REG_ALARM2 0xAA	/* realtime status register2 */
#define W83791D_REG_ALARM3 0xAB	/* realtime status register3 */

#define W83791D_REG_VBAT		0x5D
#define W83791D_REG_I2C_ADDR		0x48

/* The SMBus locks itself. The Winbond W83791D has a bank select register
   (index 0x4e), but the driver only accesses registers in bank 0. Since
   we don't switch banks, we don't need any special code to handle
   locking access between bank switches */
static inline int w83791d_read(struct i2c_client *client, u8 reg)
{
	return i2c_smbus_read_byte_data(client, reg);
}

static inline int w83791d_write(struct i2c_client *client, u8 reg, u8 value)
{
	return i2c_smbus_write_byte_data(client, reg, value);
}

/* The analog voltage inputs have 16mV LSB. Since the sysfs output is
   in mV as would be measured on the chip input pin, need to just
   multiply/divide by 16 to translate from/to register values. */
#define IN_TO_REG(val)		(SENSORS_LIMIT((((val) + 8) / 16), 0, 255))
#define IN_FROM_REG(val)	((val) * 16)

static u8 fan_to_reg(long rpm, int div)
{
	if (rpm == 0)
		return 255;
	rpm = SENSORS_LIMIT(rpm, 1, 1000000);
	return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
}

#define FAN_FROM_REG(val,div)	((val) == 0   ? -1 : \
				((val) == 255 ? 0 : \
					1350000 / ((val) * (div))))

/* for temp1 which is 8-bit resolution, LSB = 1 degree Celsius */
#define TEMP1_FROM_REG(val)	((val) * 1000)
#define TEMP1_TO_REG(val)	((val) <= -128000 ? -128 : \
				 (val) >= 127000 ? 127 : \
				 (val) < 0 ? ((val) - 500) / 1000 : \
				 ((val) + 500) / 1000)

/* for temp2 and temp3 which are 9-bit resolution, LSB = 0.5 degree Celsius
   Assumes the top 8 bits are the integral amount and the bottom 8 bits
   are the fractional amount. Since we only have 0.5 degree resolution,
   the bottom 7 bits will always be zero */
#define TEMP23_FROM_REG(val)	((val) / 128 * 500)
#define TEMP23_TO_REG(val)	((val) <= -128000 ? 0x8000 : \
				 (val) >= 127500 ? 0x7F80 : \
				 (val) < 0 ? ((val) - 250) / 500 * 128 : \
				 ((val) + 250) / 500 * 128)


#define BEEP_MASK_TO_REG(val)		((val) & 0xffffff)
#define BEEP_MASK_FROM_REG(val)		((val) & 0xffffff)

#define DIV_FROM_REG(val)		(1 << (val))

static u8 div_to_reg(int nr, long val)
{
	int i;
	int max;

	/* first three fan's divisor max out at 8, rest max out at 128 */
	max = (nr < 3) ? 8 : 128;
	val = SENSORS_LIMIT(val, 1, max) >> 1;
	for (i = 0; i < 7; i++) {
		if (val == 0)
			break;
		val >>= 1;
	}
	return (u8) i;
}

struct w83791d_data {
	struct i2c_client client;
	struct device *hwmon_dev;
	struct mutex update_lock;

	char valid;			/* !=0 if following fields are valid */
	unsigned long last_updated;	/* In jiffies */

	/* array of 2 pointers to subclients */
	struct i2c_client *lm75[2];

	/* volts */
	u8 in[NUMBER_OF_VIN];		/* Register value */
	u8 in_max[NUMBER_OF_VIN];	/* Register value */
	u8 in_min[NUMBER_OF_VIN];	/* Register value */

	/* fans */
	u8 fan[NUMBER_OF_FANIN];	/* Register value */
	u8 fan_min[NUMBER_OF_FANIN];	/* Register value */
	u8 fan_div[NUMBER_OF_FANIN];	/* Register encoding, shifted right */

	/* Temperature sensors */

	s8 temp1[3];		/* current, over, thyst */
	s16 temp_add[2][3];	/* fixed point value. Top 8 bits are the
				   integral part, bottom 8 bits are the
				   fractional part. We only use the top
				   9 bits as the resolution is only
				   to the 0.5 degree C...
				   two sensors with three values
				   (cur, over, hyst)  */

	/* Misc */
	u32 alarms;		/* realtime status register encoding,combined */
	u8 beep_enable;		/* Global beep enable */
	u32 beep_mask;		/* Mask off specific beeps */
	u8 vid;			/* Register encoding, combined */
	u8 vrm;			/* hwmon-vid */
};

static int w83791d_attach_adapter(struct i2c_adapter *adapter);
static int w83791d_detect(struct i2c_adapter *adapter, int address, int kind);
static int w83791d_detach_client(struct i2c_client *client);

static int w83791d_read(struct i2c_client *client, u8 register);
static int w83791d_write(struct i2c_client *client, u8 register, u8 value);
static struct w83791d_data *w83791d_update_device(struct device *dev);

#ifdef DEBUG
static void w83791d_print_debug(struct w83791d_data *data, struct device *dev);
#endif

static void w83791d_init_client(struct i2c_client *client);

static struct i2c_driver w83791d_driver = {
	.driver = {
		.name = "w83791d",
	},
	.attach_adapter = w83791d_attach_adapter,
	.detach_client = w83791d_detach_client,
};

/* following are the sysfs callback functions */
#define show_in_reg(reg) \
static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
			char *buf) \
{ \
	struct sensor_device_attribute *sensor_attr = \
						to_sensor_dev_attr(attr); \
	struct w83791d_data *data = w83791d_update_device(dev); \
	int nr = sensor_attr->index; \
	return sprintf(buf,"%d\n", IN_FROM_REG(data->reg[nr])); \
}

show_in_reg(in);
show_in_reg(in_min);
show_in_reg(in_max);

#define store_in_reg(REG, reg) \
static ssize_t store_in_##reg(struct device *dev, \
				struct device_attribute *attr, \
				const char *buf, size_t count) \
{ \
	struct sensor_device_attribute *sensor_attr = \
						to_sensor_dev_attr(attr); \
	struct i2c_client *client = to_i2c_client(dev); \
	struct w83791d_data *data = i2c_get_clientdata(client); \
	unsigned long val = simple_strtoul(buf, NULL, 10); \
	int nr = sensor_attr->index; \
	 \
	mutex_lock(&data->update_lock); \
	data->in_##reg[nr] = IN_TO_REG(val); \
	w83791d_write(client, W83791D_REG_IN_##REG[nr], data->in_##reg[nr]); \
	mutex_unlock(&data->update_lock); \
	 \
	return count; \
}
store_in_reg(MIN, min);
store_in_reg(MAX, max);

static struct sensor_device_attribute sda_in_input[] = {
	SENSOR_ATTR(in0_input, S_IRUGO, show_in, NULL, 0),
	SENSOR_ATTR(in1_input, S_IRUGO, show_in, NULL, 1),
	SENSOR_ATTR(in2_input, S_IRUGO, show_in, NULL, 2),
	SENSOR_ATTR(in3_input, S_IRUGO, show_in, NULL, 3),
	SENSOR_ATTR(in4_input, S_IRUGO, show_in, NULL, 4),
	SENSOR_ATTR(in5_input, S_IRUGO, show_in, NULL, 5),
	SENSOR_ATTR(in6_input, S_IRUGO, show_in, NULL, 6),
	SENSOR_ATTR(in7_input, S_IRUGO, show_in, NULL, 7),
	SENSOR_ATTR(in8_input, S_IRUGO, show_in, NULL, 8),
	SENSOR_ATTR(in9_input, S_IRUGO, show_in, NULL, 9),
};

static struct sensor_device_attribute sda_in_min[] = {
	SENSOR_ATTR(in0_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 0),
	SENSOR_ATTR(in1_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 1),
	SENSOR_ATTR(in2_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 2),
	SENSOR_ATTR(in3_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 3),
	SENSOR_ATTR(in4_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 4),
	SENSOR_ATTR(in5_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 5),
	SENSOR_ATTR(in6_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 6),
	SENSOR_ATTR(in7_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 7),
	SENSOR_ATTR(in8_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 8),
	SENSOR_ATTR(in9_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 9),
};

static struct sensor_device_attribute sda_in_max[] = {
	SENSOR_ATTR(in0_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 0),
	SENSOR_ATTR(in1_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 1),
	SENSOR_ATTR(in2_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 2),
	SENSOR_ATTR(in3_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 3),
	SENSOR_ATTR(in4_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 4),
	SENSOR_ATTR(in5_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 5),
	SENSOR_ATTR(in6_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 6),
	SENSOR_ATTR(in7_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 7),
	SENSOR_ATTR(in8_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 8),
	SENSOR_ATTR(in9_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 9),
};


static ssize_t show_beep(struct device *dev, struct device_attribute *attr,
			char *buf)
{
	struct sensor_device_attribute *sensor_attr =
						to_sensor_dev_attr(attr);
	struct w83791d_data *data = w83791d_update_device(dev);
	int bitnr = sensor_attr->index;

	return sprintf(buf, "%d\n", (data->beep_mask >> bitnr) & 1);
}

static ssize_t store_beep(struct device *dev, struct device_attribute *attr,
			const char *buf, size_t count)
{
	struct sensor_device_attribute *sensor_attr =
						to_sensor_dev_attr(attr);
	struct i2c_client *client = to_i2c_client(dev);
	struct w83791d_data *data = i2c_get_clientdata(client);
	int bitnr = sensor_attr->index;
	int bytenr = bitnr / 8;
	long val = simple_strtol(buf, NULL, 10) ? 1 : 0;

	mutex_lock(&data->update_lock);

	data->beep_mask &= ~(0xff << (bytenr * 8));
	data->beep_mask |= w83791d_read(client, W83791D_REG_BEEP_CTRL[bytenr])
		<< (bytenr * 8);

	data->beep_mask &= ~(1 << bitnr);
	data->beep_mask |= val << bitnr;

	w83791d_write(client, W83791D_REG_BEEP_CTRL[bytenr],
		(data->beep_mask >> (bytenr * 8)) & 0xff);

	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
			char *buf)
{
	struct sensor_device_attribute *sensor_attr =
						to_sensor_dev_attr(attr);
	struct w83791d_data *data = w83791d_update_device(dev);
	int bitnr = sensor_attr->index;

	return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
}

/* Note: The bitmask for the beep enable/disable is different than
   the bitmask for the alarm. */
static struct sensor_device_attribute sda_in_beep[] = {
	SENSOR_ATTR(in0_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 0),
	SENSOR_ATTR(in1_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 13),
	SENSOR_ATTR(in2_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 2),
	SENSOR_ATTR(in3_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 3),
	SENSOR_ATTR(in4_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 8),
	SENSOR_ATTR(in5_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 9),
	SENSOR_ATTR(in6_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 10),
	SENSOR_ATTR(in7_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 16),
	SENSOR_ATTR(in8_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 17),
	SENSOR_ATTR(in9_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 14),
};

static struct sensor_device_attribute sda_in_alarm[] = {
	SENSOR_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0),
	SENSOR_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1),
	SENSOR_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2),
	SENSOR_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3),
	SENSOR_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8),
	SENSOR_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9),
	SENSOR_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 10),
	SENSOR_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 19),
	SENSOR_ATTR(in8_alarm, S_IRUGO, show_alarm, NULL, 20),
	SENSOR_ATTR(in9_alarm, S_IRUGO, show_alarm, NULL, 14),
};

#define show_fan_reg(reg) \
static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
				char *buf) \
{ \
	struct sensor_device_attribute *sensor_attr = \
						to_sensor_dev_attr(attr); \
	struct w83791d_data *data = w83791d_update_device(dev); \
	int nr = sensor_attr->index; \
	return sprintf(buf,"%d\n", \
		FAN_FROM_REG(data->reg[nr], DIV_FROM_REG(data->fan_div[nr]))); \
}

show_fan_reg(fan);
show_fan_reg(fan_min);

static ssize_t store_fan_min(struct device *dev, struct device_attribute *attr,
				const char *buf, size_t count)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	struct i2c_client *client = to_i2c_client(dev);
	struct w83791d_data *data = i2c_get_clientdata(client);
	unsigned long val = simple_strtoul(buf, NULL, 10);
	int nr = sensor_attr->index;

	mutex_lock(&data->update_lock);
	data->fan_min[nr] = fan_to_reg(val, DIV_FROM_REG(data->fan_div[nr]));
	w83791d_write(client, W83791D_REG_FAN_MIN[nr], data->fan_min[nr]);
	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
				char *buf)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;
	struct w83791d_data *data = w83791d_update_device(dev);
	return sprintf(buf, "%u\n", DIV_FROM_REG(data->fan_div[nr]));
}

/* Note: we save and restore the fan minimum here, because its value is
   determined in part by the fan divisor.  This follows the principle of
   least suprise; the user doesn't expect the fan minimum to change just
   because the divisor changed. */
static ssize_t store_fan_div(struct device *dev, struct device_attribute *attr,
				const char *buf, size_t count)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	struct i2c_client *client = to_i2c_client(dev);
	struct w83791d_data *data = i2c_get_clientdata(client);
	int nr = sensor_attr->index;
	unsigned long min;
	u8 tmp_fan_div;
	u8 fan_div_reg;
	int indx = 0;
	u8 keep_mask = 0;
	u8 new_shift = 0;

	/* Save fan_min */
	min = FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr]));

	mutex_lock(&data->update_lock);
	data->fan_div[nr] = div_to_reg(nr, simple_strtoul(buf, NULL, 10));

	switch (nr) {
	case 0:
		indx = 0;
		keep_mask = 0xcf;
		new_shift = 4;
		break;
	case 1:
		indx = 0;
		keep_mask = 0x3f;
		new_shift = 6;
		break;
	case 2:
		indx = 1;
		keep_mask = 0x3f;
		new_shift = 6;
		break;
	case 3:
		indx = 2;
		keep_mask = 0xf8;
		new_shift = 0;
		break;
	case 4:
		indx = 2;
		keep_mask = 0x8f;
		new_shift = 4;
		break;
#ifdef DEBUG
	default:
		dev_warn(dev, "store_fan_div: Unexpected nr seen: %d\n", nr);
		count = -EINVAL;
		goto err_exit;
#endif
	}

	fan_div_reg = w83791d_read(client, W83791D_REG_FAN_DIV[indx])
			& keep_mask;
	tmp_fan_div = (data->fan_div[nr] << new_shift) & ~keep_mask;

	w83791d_write(client, W83791D_REG_FAN_DIV[indx],
				fan_div_reg | tmp_fan_div);

	/* Restore fan_min */
	data->fan_min[nr] = fan_to_reg(min, DIV_FROM_REG(data->fan_div[nr]));
	w83791d_write(client, W83791D_REG_FAN_MIN[nr], data->fan_min[nr]);

#ifdef DEBUG
err_exit:
#endif
	mutex_unlock(&data->update_lock);

	return count;
}

static struct sensor_device_attribute sda_fan_input[] = {
	SENSOR_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0),
	SENSOR_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1),
	SENSOR_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2),
	SENSOR_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3),
	SENSOR_ATTR(fan5_input, S_IRUGO, show_fan, NULL, 4),
};

static struct sensor_device_attribute sda_fan_min[] = {
	SENSOR_ATTR(fan1_min, S_IWUSR | S_IRUGO,
			show_fan_min, store_fan_min, 0),
	SENSOR_ATTR(fan2_min, S_IWUSR | S_IRUGO,
			show_fan_min, store_fan_min, 1),
	SENSOR_ATTR(fan3_min, S_IWUSR | S_IRUGO,
			show_fan_min, store_fan_min, 2),
	SENSOR_ATTR(fan4_min, S_IWUSR | S_IRUGO,
			show_fan_min, store_fan_min, 3),
	SENSOR_ATTR(fan5_min, S_IWUSR | S_IRUGO,
			show_fan_min, store_fan_min, 4),
};

static struct sensor_device_attribute sda_fan_div[] = {
	SENSOR_ATTR(fan1_div, S_IWUSR | S_IRUGO,
			show_fan_div, store_fan_div, 0),
	SENSOR_ATTR(fan2_div, S_IWUSR | S_IRUGO,
			show_fan_div, store_fan_div, 1),
	SENSOR_ATTR(fan3_div, S_IWUSR | S_IRUGO,
			show_fan_div, store_fan_div, 2),
	SENSOR_ATTR(fan4_div, S_IWUSR | S_IRUGO,
			show_fan_div, store_fan_div, 3),
	SENSOR_ATTR(fan5_div, S_IWUSR | S_IRUGO,
			show_fan_div, store_fan_div, 4),
};

static struct sensor_device_attribute sda_fan_beep[] = {
	SENSOR_ATTR(fan1_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 6),
	SENSOR_ATTR(fan2_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 7),
	SENSOR_ATTR(fan3_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 11),
	SENSOR_ATTR(fan4_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 21),
	SENSOR_ATTR(fan5_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 22),
};

static struct sensor_device_attribute sda_fan_alarm[] = {
	SENSOR_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6),
	SENSOR_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7),
	SENSOR_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 11),
	SENSOR_ATTR(fan4_alarm, S_IRUGO, show_alarm, NULL, 21),
	SENSOR_ATTR(fan5_alarm, S_IRUGO, show_alarm, NULL, 22),
};

/* read/write the temperature1, includes measured value and limits */
static ssize_t show_temp1(struct device *dev, struct device_attribute *devattr,
				char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct w83791d_data *data = w83791d_update_device(dev);
	return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->temp1[attr->index]));
}

static ssize_t store_temp1(struct device *dev, struct device_attribute *devattr,
				const char *buf, size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct i2c_client *client = to_i2c_client(dev);
	struct w83791d_data *data = i2c_get_clientdata(client);
	long val = simple_strtol(buf, NULL, 10);
	int nr = attr->index;

	mutex_lock(&data->update_lock);
	data->temp1[nr] = TEMP1_TO_REG(val);
	w83791d_write(client, W83791D_REG_TEMP1[nr], data->temp1[nr]);
	mutex_unlock(&data->update_lock);
	return count;
}

/* read/write temperature2-3, includes measured value and limits */
static ssize_t show_temp23(struct device *dev, struct device_attribute *devattr,
				char *buf)
{
	struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
	struct w83791d_data *data = w83791d_update_device(dev);
	int nr = attr->nr;
	int index = attr->index;
	return sprintf(buf, "%d\n", TEMP23_FROM_REG(data->temp_add[nr][index]));
}

static ssize_t store_temp23(struct device *dev,
				struct device_attribute *devattr,
				const char *buf, size_t count)
{
	struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
	struct i2c_client *client = to_i2c_client(dev);
	struct w83791d_data *data = i2c_get_clientdata(client);
	long val = simple_strtol(buf, NULL, 10);
	int nr = attr->nr;
	int index = attr->index;

	mutex_lock(&data->update_lock);
	data->temp_add[nr][index] = TEMP23_TO_REG(val);
	w83791d_write(client, W83791D_REG_TEMP_ADD[nr][index * 2],
				data->temp_add[nr][index] >> 8);
	w83791d_write(client, W83791D_REG_TEMP_ADD[nr][index * 2 + 1],
				data->temp_add[nr][index] & 0x80);
	mutex_unlock(&data->update_lock);

	return count;
}

static struct sensor_device_attribute_2 sda_temp_input[] = {
	SENSOR_ATTR_2(temp1_input, S_IRUGO, show_temp1, NULL, 0, 0),
	SENSOR_ATTR_2(temp2_input, S_IRUGO, show_temp23, NULL, 0, 0),
	SENSOR_ATTR_2(temp3_input, S_IRUGO, show_temp23, NULL, 1, 0),
};

static struct sensor_device_attribute_2 sda_temp_max[] = {
	SENSOR_ATTR_2(temp1_max, S_IRUGO | S_IWUSR,
			show_temp1, store_temp1, 0, 1),
	SENSOR_ATTR_2(temp2_max, S_IRUGO | S_IWUSR,
			show_temp23, store_temp23, 0, 1),
	SENSOR_ATTR_2(temp3_max, S_IRUGO | S_IWUSR,
			show_temp23, store_temp23, 1, 1),
};

static struct sensor_device_attribute_2 sda_temp_max_hyst[] = {
	SENSOR_ATTR_2(temp1_max_hyst, S_IRUGO | S_IWUSR,
			show_temp1, store_temp1, 0, 2),
	SENSOR_ATTR_2(temp2_max_hyst, S_IRUGO | S_IWUSR,
			show_temp23, store_temp23, 0, 2),
	SENSOR_ATTR_2(temp3_max_hyst, S_IRUGO | S_IWUSR,
			show_temp23, store_temp23, 1, 2),
};

/* Note: The bitmask for the beep enable/disable is different than
   the bitmask for the alarm. */
static struct sensor_device_attribute sda_temp_beep[] = {
	SENSOR_ATTR(temp1_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 4),
	SENSOR_ATTR(temp2_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 5),
	SENSOR_ATTR(temp3_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 1),
};

static struct sensor_device_attribute sda_temp_alarm[] = {
	SENSOR_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4),
	SENSOR_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5),
	SENSOR_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 13),
};

/* get reatime status of all sensors items: voltage, temp, fan */
static ssize_t show_alarms_reg(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct w83791d_data *data = w83791d_update_device(dev);
	return sprintf(buf, "%u\n", data->alarms);
}

static DEVICE_ATTR(alarms, S_IRUGO, show_alarms_reg, NULL);

/* Beep control */

#define GLOBAL_BEEP_ENABLE_SHIFT	15
#define GLOBAL_BEEP_ENABLE_MASK		(1 << GLOBAL_BEEP_ENABLE_SHIFT)

static ssize_t show_beep_enable(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct w83791d_data *data = w83791d_update_device(dev);
	return sprintf(buf, "%d\n", data->beep_enable);
}

static ssize_t show_beep_mask(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct w83791d_data *data = w83791d_update_device(dev);
	return sprintf(buf, "%d\n", BEEP_MASK_FROM_REG(data->beep_mask));
}


static ssize_t store_beep_mask(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct w83791d_data *data = i2c_get_clientdata(client);
	long val = simple_strtol(buf, NULL, 10);
	int i;

	mutex_lock(&data->update_lock);

	/* The beep_enable state overrides any enabling request from
	   the masks */
	data->beep_mask = BEEP_MASK_TO_REG(val) & ~GLOBAL_BEEP_ENABLE_MASK;
	data->beep_mask |= (data->beep_enable << GLOBAL_BEEP_ENABLE_SHIFT);

	val = data->beep_mask;

	for (i = 0; i < 3; i++) {
		w83791d_write(client, W83791D_REG_BEEP_CTRL[i], (val & 0xff));
		val >>= 8;
	}

	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t store_beep_enable(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct w83791d_data *data = i2c_get_clientdata(client);
	long val = simple_strtol(buf, NULL, 10);

	mutex_lock(&data->update_lock);

	data->beep_enable = val ? 1 : 0;

	/* Keep the full mask value in sync with the current enable */
	data->beep_mask &= ~GLOBAL_BEEP_ENABLE_MASK;
	data->beep_mask |= (data->beep_enable << GLOBAL_BEEP_ENABLE_SHIFT);

	/* The global control is in the second beep control register
	   so only need to update that register */
	val = (data->beep_mask >> 8) & 0xff;

	w83791d_write(client, W83791D_REG_BEEP_CTRL[1], val);

	mutex_unlock(&data->update_lock);

	return count;
}

static struct sensor_device_attribute sda_beep_ctrl[] = {
	SENSOR_ATTR(beep_enable, S_IRUGO | S_IWUSR,
			show_beep_enable, store_beep_enable, 0),
	SENSOR_ATTR(beep_mask, S_IRUGO | S_IWUSR,
			show_beep_mask, store_beep_mask, 1)
};

/* cpu voltage regulation information */
static ssize_t show_vid_reg(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct w83791d_data *data = w83791d_update_device(dev);
	return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
}

static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid_reg, NULL);

static ssize_t show_vrm_reg(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct w83791d_data *data = dev_get_drvdata(dev);
	return sprintf(buf, "%d\n", data->vrm);
}

static ssize_t store_vrm_reg(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct w83791d_data *data = i2c_get_clientdata(client);
	unsigned long val = simple_strtoul(buf, NULL, 10);

	/* No lock needed as vrm is internal to the driver
	   (not read from a chip register) and so is not
	   updated in w83791d_update_device() */
	data->vrm = val;

	return count;
}

static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm_reg, store_vrm_reg);

#define IN_UNIT_ATTRS(X) \
	&sda_in_input[X].dev_attr.attr, \
	&sda_in_min[X].dev_attr.attr,   \
	&sda_in_max[X].dev_attr.attr,   \
	&sda_in_beep[X].dev_attr.attr,  \
	&sda_in_alarm[X].dev_attr.attr

#define FAN_UNIT_ATTRS(X) \
	&sda_fan_input[X].dev_attr.attr,        \
	&sda_fan_min[X].dev_attr.attr,          \
	&sda_fan_div[X].dev_attr.attr,          \
	&sda_fan_beep[X].dev_attr.attr,         \
	&sda_fan_alarm[X].dev_attr.attr

#define TEMP_UNIT_ATTRS(X) \
	&sda_temp_input[X].dev_attr.attr,       \
	&sda_temp_max[X].dev_attr.attr,         \
	&sda_temp_max_hyst[X].dev_attr.attr,    \
	&sda_temp_beep[X].dev_attr.attr,        \
	&sda_temp_alarm[X].dev_attr.attr

static struct attribute *w83791d_attributes[] = {
	IN_UNIT_ATTRS(0),
	IN_UNIT_ATTRS(1),
	IN_UNIT_ATTRS(2),
	IN_UNIT_ATTRS(3),
	IN_UNIT_ATTRS(4),
	IN_UNIT_ATTRS(5),
	IN_UNIT_ATTRS(6),
	IN_UNIT_ATTRS(7),
	IN_UNIT_ATTRS(8),
	IN_UNIT_ATTRS(9),
	FAN_UNIT_ATTRS(0),
	FAN_UNIT_ATTRS(1),
	FAN_UNIT_ATTRS(2),
	FAN_UNIT_ATTRS(3),
	FAN_UNIT_ATTRS(4),
	TEMP_UNIT_ATTRS(0),
	TEMP_UNIT_ATTRS(1),
	TEMP_UNIT_ATTRS(2),
	&dev_attr_alarms.attr,
	&sda_beep_ctrl[0].dev_attr.attr,
	&sda_beep_ctrl[1].dev_attr.attr,
	&dev_attr_cpu0_vid.attr,
	&dev_attr_vrm.attr,
	NULL
};

static const struct attribute_group w83791d_group = {
	.attrs = w83791d_attributes,
};

/* This function is called when:
     * w83791d_driver is inserted (when this module is loaded), for each
       available adapter
     * when a new adapter is inserted (and w83791d_driver is still present) */
static int w83791d_attach_adapter(struct i2c_adapter *adapter)
{
	if (!(adapter->class & I2C_CLASS_HWMON))
		return 0;
	return i2c_probe(adapter, &addr_data, w83791d_detect);
}


static int w83791d_create_subclient(struct i2c_adapter *adapter,
				struct i2c_client *client, int addr,
				struct i2c_client **sub_cli)
{
	int err;
	struct i2c_client *sub_client;

	(*sub_cli) = sub_client =
			kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
	if (!(sub_client)) {
		return -ENOMEM;
	}
	sub_client->addr = 0x48 + addr;
	i2c_set_clientdata(sub_client, NULL);
	sub_client->adapter = adapter;
	sub_client->driver = &w83791d_driver;
	strlcpy(sub_client->name, "w83791d subclient", I2C_NAME_SIZE);
	if ((err = i2c_attach_client(sub_client))) {
		dev_err(&client->dev, "subclient registration "
			"at address 0x%x failed\n", sub_client->addr);
		kfree(sub_client);
		return err;
	}
	return 0;
}


static int w83791d_detect_subclients(struct i2c_adapter *adapter, int address,
				int kind, struct i2c_client *client)
{
	struct w83791d_data *data = i2c_get_clientdata(client);
	int i, id, err;
	u8 val;

	id = i2c_adapter_id(adapter);
	if (force_subclients[0] == id && force_subclients[1] == address) {
		for (i = 2; i <= 3; i++) {
			if (force_subclients[i] < 0x48 ||
			    force_subclients[i] > 0x4f) {
				dev_err(&client->dev,
					"invalid subclient "
					"address %d; must be 0x48-0x4f\n",
					force_subclients[i]);
				err = -ENODEV;
				goto error_sc_0;
			}
		}
		w83791d_write(client, W83791D_REG_I2C_SUBADDR,
					(force_subclients[2] & 0x07) |
					((force_subclients[3] & 0x07) << 4));
	}

	val = w83791d_read(client, W83791D_REG_I2C_SUBADDR);
	if (!(val & 0x08)) {
		err = w83791d_create_subclient(adapter, client,
						val & 0x7, &data->lm75[0]);
		if (err < 0)
			goto error_sc_0;
	}
	if (!(val & 0x80)) {
		if ((data->lm75[0] != NULL) &&
				((val & 0x7) == ((val >> 4) & 0x7))) {
			dev_err(&client->dev,
				"duplicate addresses 0x%x, "
				"use force_subclient\n",
				data->lm75[0]->addr);
			err = -ENODEV;
			goto error_sc_1;
		}
		err = w83791d_create_subclient(adapter, client,
					(val >> 4) & 0x7, &data->lm75[1]);
		if (err < 0)
			goto error_sc_1;
	}

	return 0;

/* Undo inits in case of errors */

error_sc_1:
	if (data->lm75[0] != NULL) {
		i2c_detach_client(data->lm75[0]);
		kfree(data->lm75[0]);
	}
error_sc_0:
	return err;
}


static int w83791d_detect(struct i2c_adapter *adapter, int address, int kind)
{
	struct i2c_client *client;
	struct device *dev;
	struct w83791d_data *data;
	int i, val1, val2;
	int err = 0;
	const char *client_name = "";

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
		goto error0;
	}

	/* OK. For now, we presume we have a valid client. We now create the
	   client structure, even though we cannot fill it completely yet.
	   But it allows us to access w83791d_{read,write}_value. */
	if (!(data = kzalloc(sizeof(struct w83791d_data), GFP_KERNEL))) {
		err = -ENOMEM;
		goto error0;
	}

	client = &data->client;
	dev = &client->dev;
	i2c_set_clientdata(client, data);
	client->addr = address;
	client->adapter = adapter;
	client->driver = &w83791d_driver;
	mutex_init(&data->update_lock);

	/* Now, we do the remaining detection. */

	/* The w83791d may be stuck in some other bank than bank 0. This may
	   make reading other information impossible. Specify a force=...
	   parameter, and the Winbond will be reset to the right bank. */
	if (kind < 0) {
		if (w83791d_read(client, W83791D_REG_CONFIG) & 0x80) {
			dev_dbg(dev, "Detection failed at step 1\n");
			goto error1;
		}
		val1 = w83791d_read(client, W83791D_REG_BANK);
		val2 = w83791d_read(client, W83791D_REG_CHIPMAN);
		/* Check for Winbond ID if in bank 0 */
		if (!(val1 & 0x07)) {
			/* yes it is Bank0 */
			if (((!(val1 & 0x80)) && (val2 != 0xa3)) ||
			    ((val1 & 0x80) && (val2 != 0x5c))) {
				dev_dbg(dev, "Detection failed at step 2\n");
				goto error1;
			}
		}
		/* If Winbond chip, address of chip and W83791D_REG_I2C_ADDR
		   should match */
		if (w83791d_read(client, W83791D_REG_I2C_ADDR) != address) {
			dev_dbg(dev, "Detection failed at step 3\n");
			goto error1;
		}
	}

	/* We either have a force parameter or we have reason to
	   believe it is a Winbond chip. Either way, we want bank 0 and
	   Vendor ID high byte */
	val1 = w83791d_read(client, W83791D_REG_BANK) & 0x78;
	w83791d_write(client, W83791D_REG_BANK, val1 | 0x80);

	/* Verify it is a Winbond w83791d */
	if (kind <= 0) {
		/* get vendor ID */
		val2 = w83791d_read(client, W83791D_REG_CHIPMAN);
		if (val2 != 0x5c) {	/* the vendor is NOT Winbond */
			dev_dbg(dev, "Detection failed at step 4\n");
			goto error1;
		}
		val1 = w83791d_read(client, W83791D_REG_WCHIPID);
		if (val1 == 0x71) {
			kind = w83791d;
		} else {
			if (kind == 0)
				dev_warn(dev,
					"w83791d: Ignoring 'force' parameter "
					"for unknown chip at adapter %d, "
					"address 0x%02x\n",
					i2c_adapter_id(adapter), address);
			goto error1;
		}
	}

	if (kind == w83791d) {
		client_name = "w83791d";
	} else {
		dev_err(dev, "w83791d: Internal error: unknown kind (%d)?!?",
			kind);
		goto error1;
	}

#ifdef DEBUG
	val1 = w83791d_read(client, W83791D_REG_DID_VID4);
	dev_dbg(dev, "Device ID version: %d.%d (0x%02x)\n",
			(val1 >> 5) & 0x07, (val1 >> 1) & 0x0f, val1);
#endif

	/* Fill in the remaining client fields and put into the global list */
	strlcpy(client->name, client_name, I2C_NAME_SIZE);

	/* Tell the I2C layer a new client has arrived */
	if ((err = i2c_attach_client(client)))
		goto error1;

	if ((err = w83791d_detect_subclients(adapter, address, kind, client)))
		goto error2;

	/* Initialize the chip */
	w83791d_init_client(client);

	/* If the fan_div is changed, make sure there is a rational
	   fan_min in place */
	for (i = 0; i < NUMBER_OF_FANIN; i++) {
		data->fan_min[i] = w83791d_read(client, W83791D_REG_FAN_MIN[i]);
	}

	/* Register sysfs hooks */
	if ((err = sysfs_create_group(&client->dev.kobj, &w83791d_group)))
		goto error3;

	/* Everything is ready, now register the working device */
	data->hwmon_dev = hwmon_device_register(dev);
	if (IS_ERR(data->hwmon_dev)) {
		err = PTR_ERR(data->hwmon_dev);
		goto error4;
	}

	return 0;

error4:
	sysfs_remove_group(&client->dev.kobj, &w83791d_group);
error3:
	if (data->lm75[0] != NULL) {
		i2c_detach_client(data->lm75[0]);
		kfree(data->lm75[0]);
	}
	if (data->lm75[1] != NULL) {
		i2c_detach_client(data->lm75[1]);
		kfree(data->lm75[1]);
	}
error2:
	i2c_detach_client(client);
error1:
	kfree(data);
error0:
	return err;
}

static int w83791d_detach_client(struct i2c_client *client)
{
	struct w83791d_data *data = i2c_get_clientdata(client);
	int err;

	/* main client */
	if (data) {
		hwmon_device_unregister(data->hwmon_dev);
		sysfs_remove_group(&client->dev.kobj, &w83791d_group);
	}

	if ((err = i2c_detach_client(client)))
		return err;

	/* main client */
	if (data)
		kfree(data);
	/* subclient */
	else
		kfree(client);

	return 0;
}

static void w83791d_init_client(struct i2c_client *client)
{
	struct w83791d_data *data = i2c_get_clientdata(client);
	u8 tmp;
	u8 old_beep;

	/* The difference between reset and init is that reset
	   does a hard reset of the chip via index 0x40, bit 7,
	   but init simply forces certain registers to have "sane"
	   values. The hope is that the BIOS has done the right
	   thing (which is why the default is reset=0, init=0),
	   but if not, reset is the hard hammer and init
	   is the soft mallet both of which are trying to whack
	   things into place...
	   NOTE: The data sheet makes a distinction between
	   "power on defaults" and "reset by MR". As far as I can tell,
	   the hard reset puts everything into a power-on state so I'm
	   not sure what "reset by MR" means or how it can happen.
	   */
	if (reset || init) {
		/* keep some BIOS settings when we... */
		old_beep = w83791d_read(client, W83791D_REG_BEEP_CONFIG);

		if (reset) {
			/* ... reset the chip and ... */
			w83791d_write(client, W83791D_REG_CONFIG, 0x80);
		}

		/* ... disable power-on abnormal beep */
		w83791d_write(client, W83791D_REG_BEEP_CONFIG, old_beep | 0x80);

		/* disable the global beep (not done by hard reset) */
		tmp = w83791d_read(client, W83791D_REG_BEEP_CTRL[1]);
		w83791d_write(client, W83791D_REG_BEEP_CTRL[1], tmp & 0xef);

		if (init) {
			/* Make sure monitoring is turned on for add-ons */
			tmp = w83791d_read(client, W83791D_REG_TEMP2_CONFIG);
			if (tmp & 1) {
				w83791d_write(client, W83791D_REG_TEMP2_CONFIG,
					tmp & 0xfe);
			}

			tmp = w83791d_read(client, W83791D_REG_TEMP3_CONFIG);
			if (tmp & 1) {
				w83791d_write(client, W83791D_REG_TEMP3_CONFIG,
					tmp & 0xfe);
			}

			/* Start monitoring */
			tmp = w83791d_read(client, W83791D_REG_CONFIG) & 0xf7;
			w83791d_write(client, W83791D_REG_CONFIG, tmp | 0x01);
		}
	}

	data->vrm = vid_which_vrm();
}

static struct w83791d_data *w83791d_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct w83791d_data *data = i2c_get_clientdata(client);
	int i, j;
	u8 reg_array_tmp[3];

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + (HZ * 3))
			|| !data->valid) {
		dev_dbg(dev, "Starting w83791d device update\n");

		/* Update the voltages measured value and limits */
		for (i = 0; i < NUMBER_OF_VIN; i++) {
			data->in[i] = w83791d_read(client,
						W83791D_REG_IN[i]);
			data->in_max[i] = w83791d_read(client,
						W83791D_REG_IN_MAX[i]);
			data->in_min[i] = w83791d_read(client,
						W83791D_REG_IN_MIN[i]);
		}

		/* Update the fan counts and limits */
		for (i = 0; i < NUMBER_OF_FANIN; i++) {
			/* Update the Fan measured value and limits */
			data->fan[i] = w83791d_read(client,
						W83791D_REG_FAN[i]);
			data->fan_min[i] = w83791d_read(client,
						W83791D_REG_FAN_MIN[i]);
		}

		/* Update the fan divisor */
		for (i = 0; i < 3; i++) {
			reg_array_tmp[i] = w83791d_read(client,
						W83791D_REG_FAN_DIV[i]);
		}
		data->fan_div[0] = (reg_array_tmp[0] >> 4) & 0x03;
		data->fan_div[1] = (reg_array_tmp[0] >> 6) & 0x03;
		data->fan_div[2] = (reg_array_tmp[1] >> 6) & 0x03;
		data->fan_div[3] = reg_array_tmp[2] & 0x07;
		data->fan_div[4] = (reg_array_tmp[2] >> 4) & 0x07;

		/* Update the first temperature sensor */
		for (i = 0; i < 3; i++) {
			data->temp1[i] = w83791d_read(client,
						W83791D_REG_TEMP1[i]);
		}

		/* Update the rest of the temperature sensors */
		for (i = 0; i < 2; i++) {
			for (j = 0; j < 3; j++) {
				data->temp_add[i][j] =
					(w83791d_read(client,
					W83791D_REG_TEMP_ADD[i][j * 2]) << 8) |
					w83791d_read(client,
					W83791D_REG_TEMP_ADD[i][j * 2 + 1]);
			}
		}

		/* Update the realtime status */
		data->alarms =
			w83791d_read(client, W83791D_REG_ALARM1) +
			(w83791d_read(client, W83791D_REG_ALARM2) << 8) +
			(w83791d_read(client, W83791D_REG_ALARM3) << 16);

		/* Update the beep configuration information */
		data->beep_mask =
			w83791d_read(client, W83791D_REG_BEEP_CTRL[0]) +
			(w83791d_read(client, W83791D_REG_BEEP_CTRL[1]) << 8) +
			(w83791d_read(client, W83791D_REG_BEEP_CTRL[2]) << 16);

		/* Extract global beep enable flag */
		data->beep_enable =
			(data->beep_mask >> GLOBAL_BEEP_ENABLE_SHIFT) & 0x01;

		/* Update the cpu voltage information */
		i = w83791d_read(client, W83791D_REG_VID_FANDIV);
		data->vid = i & 0x0f;
		data->vid |= (w83791d_read(client, W83791D_REG_DID_VID4) & 0x01)
				<< 4;

		data->last_updated = jiffies;
		data->valid = 1;
	}

	mutex_unlock(&data->update_lock);

#ifdef DEBUG
	w83791d_print_debug(data, dev);
#endif

	return data;
}

#ifdef DEBUG
static void w83791d_print_debug(struct w83791d_data *data, struct device *dev)
{
	int i = 0, j = 0;

	dev_dbg(dev, "======Start of w83791d debug values======\n");
	dev_dbg(dev, "%d set of Voltages: ===>\n", NUMBER_OF_VIN);
	for (i = 0; i < NUMBER_OF_VIN; i++) {
		dev_dbg(dev, "vin[%d] is:     0x%02x\n", i, data->in[i]);
		dev_dbg(dev, "vin[%d] min is: 0x%02x\n", i, data->in_min[i]);
		dev_dbg(dev, "vin[%d] max is: 0x%02x\n", i, data->in_max[i]);
	}
	dev_dbg(dev, "%d set of Fan Counts/Divisors: ===>\n", NUMBER_OF_FANIN);
	for (i = 0; i < NUMBER_OF_FANIN; i++) {
		dev_dbg(dev, "fan[%d] is:     0x%02x\n", i, data->fan[i]);
		dev_dbg(dev, "fan[%d] min is: 0x%02x\n", i, data->fan_min[i]);
		dev_dbg(dev, "fan_div[%d] is: 0x%02x\n", i, data->fan_div[i]);
	}

	/* temperature math is signed, but only print out the
	   bits that matter */
	dev_dbg(dev, "%d set of Temperatures: ===>\n", NUMBER_OF_TEMPIN);
	for (i = 0; i < 3; i++) {
		dev_dbg(dev, "temp1[%d] is: 0x%02x\n", i, (u8) data->temp1[i]);
	}
	for (i = 0; i < 2; i++) {
		for (j = 0; j < 3; j++) {
			dev_dbg(dev, "temp_add[%d][%d] is: 0x%04x\n", i, j,
				(u16) data->temp_add[i][j]);
		}
	}

	dev_dbg(dev, "Misc Information: ===>\n");
	dev_dbg(dev, "alarm is:     0x%08x\n", data->alarms);
	dev_dbg(dev, "beep_mask is: 0x%08x\n", data->beep_mask);
	dev_dbg(dev, "beep_enable is: %d\n", data->beep_enable);
	dev_dbg(dev, "vid is: 0x%02x\n", data->vid);
	dev_dbg(dev, "vrm is: 0x%02x\n", data->vrm);
	dev_dbg(dev, "=======End of w83791d debug values========\n");
	dev_dbg(dev, "\n");
}
#endif

static int __init sensors_w83791d_init(void)
{
	return i2c_add_driver(&w83791d_driver);
}

static void __exit sensors_w83791d_exit(void)
{
	i2c_del_driver(&w83791d_driver);
}

MODULE_AUTHOR("Charles Spirakis <bezaur@gmail.com>");
MODULE_DESCRIPTION("W83791D driver");
MODULE_LICENSE("GPL");

module_init(sensors_w83791d_init);
module_exit(sensors_w83791d_exit);