summaryrefslogtreecommitdiff
path: root/drivers/hwmon/pc87427.c
blob: 58eee8fa3e6d6a9ad63b4841d093d284de88ca34 (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
/*
 *  pc87427.c - hardware monitoring driver for the
 *              National Semiconductor PC87427 Super-I/O chip
 *  Copyright (C) 2006, 2008, 2010  Jean Delvare <jdelvare@suse.de>
 *
 *  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.
 *
 *  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.
 *
 *  Supports the following chips:
 *
 *  Chip        #vin    #fan    #pwm    #temp   devid
 *  PC87427     -       8       4       6       0xF2
 *
 *  This driver assumes that no more than one chip is present.
 *  Only fans are fully supported so far. Temperatures are in read-only
 *  mode, and voltages aren't supported at all.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/platform_device.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>
#include <linux/ioport.h>
#include <linux/acpi.h>
#include <linux/io.h>

static unsigned short force_id;
module_param(force_id, ushort, 0);
MODULE_PARM_DESC(force_id, "Override the detected device ID");

static struct platform_device *pdev;

#define DRVNAME "pc87427"

/*
 * The lock mutex protects both the I/O accesses (needed because the
 * device is using banked registers) and the register cache (needed to keep
 * the data in the registers and the cache in sync at any time).
 */
struct pc87427_data {
	struct device *hwmon_dev;
	struct mutex lock;
	int address[2];
	const char *name;

	unsigned long last_updated;	/* in jiffies */
	u8 fan_enabled;			/* bit vector */
	u16 fan[8];			/* register values */
	u16 fan_min[8];			/* register values */
	u8 fan_status[8];		/* register values */

	u8 pwm_enabled;			/* bit vector */
	u8 pwm_auto_ok;			/* bit vector */
	u8 pwm_enable[4];		/* register values */
	u8 pwm[4];			/* register values */

	u8 temp_enabled;		/* bit vector */
	s16 temp[6];			/* register values */
	s8 temp_min[6];			/* register values */
	s8 temp_max[6];			/* register values */
	s8 temp_crit[6];		/* register values */
	u8 temp_status[6];		/* register values */
	u8 temp_type[6];		/* register values */
};

struct pc87427_sio_data {
	unsigned short address[2];
	u8 has_fanin;
	u8 has_fanout;
};

/*
 * Super-I/O registers and operations
 */

#define SIOREG_LDSEL	0x07	/* Logical device select */
#define SIOREG_DEVID	0x20	/* Device ID */
#define SIOREG_CF2	0x22	/* Configuration 2 */
#define SIOREG_CF3	0x23	/* Configuration 3 */
#define SIOREG_CF4	0x24	/* Configuration 4 */
#define SIOREG_CF5	0x25	/* Configuration 5 */
#define SIOREG_CFB	0x2B	/* Configuration B */
#define SIOREG_CFC	0x2C	/* Configuration C */
#define SIOREG_CFD	0x2D	/* Configuration D */
#define SIOREG_ACT	0x30	/* Device activation */
#define SIOREG_MAP	0x50	/* I/O or memory mapping */
#define SIOREG_IOBASE	0x60	/* I/O base address */

static const u8 logdev[2] = { 0x09, 0x14 };
static const char *logdev_str[2] = { DRVNAME " FMC", DRVNAME " HMC" };
#define LD_FAN		0
#define LD_IN		1
#define LD_TEMP		1

static inline int superio_enter(int sioaddr)
{
	if (!request_muxed_region(sioaddr, 2, DRVNAME))
		return -EBUSY;
	return 0;
}

static inline void superio_outb(int sioaddr, int reg, int val)
{
	outb(reg, sioaddr);
	outb(val, sioaddr + 1);
}

static inline int superio_inb(int sioaddr, int reg)
{
	outb(reg, sioaddr);
	return inb(sioaddr + 1);
}

static inline void superio_exit(int sioaddr)
{
	outb(0x02, sioaddr);
	outb(0x02, sioaddr + 1);
	release_region(sioaddr, 2);
}

/*
 * Logical devices
 */

#define REGION_LENGTH		32
#define PC87427_REG_BANK	0x0f
#define BANK_FM(nr)		(nr)
#define BANK_FT(nr)		(0x08 + (nr))
#define BANK_FC(nr)		(0x10 + (nr) * 2)
#define BANK_TM(nr)		(nr)
#define BANK_VM(nr)		(0x08 + (nr))

/*
 * I/O access functions
 */

/* ldi is the logical device index */
static inline int pc87427_read8(struct pc87427_data *data, u8 ldi, u8 reg)
{
	return inb(data->address[ldi] + reg);
}

/* Must be called with data->lock held, except during init */
static inline int pc87427_read8_bank(struct pc87427_data *data, u8 ldi,
				     u8 bank, u8 reg)
{
	outb(bank, data->address[ldi] + PC87427_REG_BANK);
	return inb(data->address[ldi] + reg);
}

/* Must be called with data->lock held, except during init */
static inline void pc87427_write8_bank(struct pc87427_data *data, u8 ldi,
				       u8 bank, u8 reg, u8 value)
{
	outb(bank, data->address[ldi] + PC87427_REG_BANK);
	outb(value, data->address[ldi] + reg);
}

/*
 * Fan registers and conversions
 */

/* fan data registers are 16-bit wide */
#define PC87427_REG_FAN			0x12
#define PC87427_REG_FAN_MIN		0x14
#define PC87427_REG_FAN_STATUS		0x10

#define FAN_STATUS_STALL		(1 << 3)
#define FAN_STATUS_LOSPD		(1 << 1)
#define FAN_STATUS_MONEN		(1 << 0)

/*
 * Dedicated function to read all registers related to a given fan input.
 * This saves us quite a few locks and bank selections.
 * Must be called with data->lock held.
 * nr is from 0 to 7
 */
static void pc87427_readall_fan(struct pc87427_data *data, u8 nr)
{
	int iobase = data->address[LD_FAN];

	outb(BANK_FM(nr), iobase + PC87427_REG_BANK);
	data->fan[nr] = inw(iobase + PC87427_REG_FAN);
	data->fan_min[nr] = inw(iobase + PC87427_REG_FAN_MIN);
	data->fan_status[nr] = inb(iobase + PC87427_REG_FAN_STATUS);
	/* Clear fan alarm bits */
	outb(data->fan_status[nr], iobase + PC87427_REG_FAN_STATUS);
}

/*
 * The 2 LSB of fan speed registers are used for something different.
 * The actual 2 LSB of the measurements are not available.
 */
static inline unsigned long fan_from_reg(u16 reg)
{
	reg &= 0xfffc;
	if (reg == 0x0000 || reg == 0xfffc)
		return 0;
	return 5400000UL / reg;
}

/* The 2 LSB of the fan speed limit registers are not significant. */
static inline u16 fan_to_reg(unsigned long val)
{
	if (val < 83UL)
		return 0xffff;
	if (val >= 1350000UL)
		return 0x0004;
	return ((1350000UL + val / 2) / val) << 2;
}

/*
 * PWM registers and conversions
 */

#define PC87427_REG_PWM_ENABLE		0x10
#define PC87427_REG_PWM_DUTY		0x12

#define PWM_ENABLE_MODE_MASK		(7 << 4)
#define PWM_ENABLE_CTLEN		(1 << 0)

#define PWM_MODE_MANUAL			(0 << 4)
#define PWM_MODE_AUTO			(1 << 4)
#define PWM_MODE_OFF			(2 << 4)
#define PWM_MODE_ON			(7 << 4)

/*
 * Dedicated function to read all registers related to a given PWM output.
 * This saves us quite a few locks and bank selections.
 * Must be called with data->lock held.
 * nr is from 0 to 3
 */
static void pc87427_readall_pwm(struct pc87427_data *data, u8 nr)
{
	int iobase = data->address[LD_FAN];

	outb(BANK_FC(nr), iobase + PC87427_REG_BANK);
	data->pwm_enable[nr] = inb(iobase + PC87427_REG_PWM_ENABLE);
	data->pwm[nr] = inb(iobase + PC87427_REG_PWM_DUTY);
}

static inline int pwm_enable_from_reg(u8 reg)
{
	switch (reg & PWM_ENABLE_MODE_MASK) {
	case PWM_MODE_ON:
		return 0;
	case PWM_MODE_MANUAL:
	case PWM_MODE_OFF:
		return 1;
	case PWM_MODE_AUTO:
		return 2;
	default:
		return -EPROTO;
	}
}

static inline u8 pwm_enable_to_reg(unsigned long val, u8 pwmval)
{
	switch (val) {
	default:
		return PWM_MODE_ON;
	case 1:
		return pwmval ? PWM_MODE_MANUAL : PWM_MODE_OFF;
	case 2:
		return PWM_MODE_AUTO;
	}
}

/*
 * Temperature registers and conversions
 */

#define PC87427_REG_TEMP_STATUS		0x10
#define PC87427_REG_TEMP		0x14
#define PC87427_REG_TEMP_MAX		0x18
#define PC87427_REG_TEMP_MIN		0x19
#define PC87427_REG_TEMP_CRIT		0x1a
#define PC87427_REG_TEMP_TYPE		0x1d

#define TEMP_STATUS_CHANEN		(1 << 0)
#define TEMP_STATUS_LOWFLG		(1 << 1)
#define TEMP_STATUS_HIGHFLG		(1 << 2)
#define TEMP_STATUS_CRITFLG		(1 << 3)
#define TEMP_STATUS_SENSERR		(1 << 5)
#define TEMP_TYPE_MASK			(3 << 5)

#define TEMP_TYPE_THERMISTOR		(1 << 5)
#define TEMP_TYPE_REMOTE_DIODE		(2 << 5)
#define TEMP_TYPE_LOCAL_DIODE		(3 << 5)

/*
 * Dedicated function to read all registers related to a given temperature
 * input. This saves us quite a few locks and bank selections.
 * Must be called with data->lock held.
 * nr is from 0 to 5
 */
static void pc87427_readall_temp(struct pc87427_data *data, u8 nr)
{
	int iobase = data->address[LD_TEMP];

	outb(BANK_TM(nr), iobase + PC87427_REG_BANK);
	data->temp[nr] = le16_to_cpu(inw(iobase + PC87427_REG_TEMP));
	data->temp_max[nr] = inb(iobase + PC87427_REG_TEMP_MAX);
	data->temp_min[nr] = inb(iobase + PC87427_REG_TEMP_MIN);
	data->temp_crit[nr] = inb(iobase + PC87427_REG_TEMP_CRIT);
	data->temp_type[nr] = inb(iobase + PC87427_REG_TEMP_TYPE);
	data->temp_status[nr] = inb(iobase + PC87427_REG_TEMP_STATUS);
	/* Clear fan alarm bits */
	outb(data->temp_status[nr], iobase + PC87427_REG_TEMP_STATUS);
}

static inline unsigned int temp_type_from_reg(u8 reg)
{
	switch (reg & TEMP_TYPE_MASK) {
	case TEMP_TYPE_THERMISTOR:
		return 4;
	case TEMP_TYPE_REMOTE_DIODE:
	case TEMP_TYPE_LOCAL_DIODE:
		return 3;
	default:
		return 0;
	}
}

/*
 * We assume 8-bit thermal sensors; 9-bit thermal sensors are possible
 * too, but I have no idea how to figure out when they are used.
 */
static inline long temp_from_reg(s16 reg)
{
	return reg * 1000 / 256;
}

static inline long temp_from_reg8(s8 reg)
{
	return reg * 1000;
}

/*
 * Data interface
 */

static struct pc87427_data *pc87427_update_device(struct device *dev)
{
	struct pc87427_data *data = dev_get_drvdata(dev);
	int i;

	mutex_lock(&data->lock);
	if (!time_after(jiffies, data->last_updated + HZ)
	 && data->last_updated)
		goto done;

	/* Fans */
	for (i = 0; i < 8; i++) {
		if (!(data->fan_enabled & (1 << i)))
			continue;
		pc87427_readall_fan(data, i);
	}

	/* PWM outputs */
	for (i = 0; i < 4; i++) {
		if (!(data->pwm_enabled & (1 << i)))
			continue;
		pc87427_readall_pwm(data, i);
	}

	/* Temperature channels */
	for (i = 0; i < 6; i++) {
		if (!(data->temp_enabled & (1 << i)))
			continue;
		pc87427_readall_temp(data, i);
	}

	data->last_updated = jiffies;

done:
	mutex_unlock(&data->lock);
	return data;
}

static ssize_t fan_input_show(struct device *dev,
			      struct device_attribute *devattr, char *buf)
{
	struct pc87427_data *data = pc87427_update_device(dev);
	int nr = to_sensor_dev_attr(devattr)->index;

	return sprintf(buf, "%lu\n", fan_from_reg(data->fan[nr]));
}

static ssize_t fan_min_show(struct device *dev,
			    struct device_attribute *devattr, char *buf)
{
	struct pc87427_data *data = pc87427_update_device(dev);
	int nr = to_sensor_dev_attr(devattr)->index;

	return sprintf(buf, "%lu\n", fan_from_reg(data->fan_min[nr]));
}

static ssize_t fan_alarm_show(struct device *dev,
			      struct device_attribute *devattr, char *buf)
{
	struct pc87427_data *data = pc87427_update_device(dev);
	int nr = to_sensor_dev_attr(devattr)->index;

	return sprintf(buf, "%d\n", !!(data->fan_status[nr]
				       & FAN_STATUS_LOSPD));
}

static ssize_t fan_fault_show(struct device *dev,
			      struct device_attribute *devattr, char *buf)
{
	struct pc87427_data *data = pc87427_update_device(dev);
	int nr = to_sensor_dev_attr(devattr)->index;

	return sprintf(buf, "%d\n", !!(data->fan_status[nr]
				       & FAN_STATUS_STALL));
}

static ssize_t fan_min_store(struct device *dev,
			     struct device_attribute *devattr,
			     const char *buf, size_t count)
{
	struct pc87427_data *data = dev_get_drvdata(dev);
	int nr = to_sensor_dev_attr(devattr)->index;
	unsigned long val;
	int iobase = data->address[LD_FAN];

	if (kstrtoul(buf, 10, &val) < 0)
		return -EINVAL;

	mutex_lock(&data->lock);
	outb(BANK_FM(nr), iobase + PC87427_REG_BANK);
	/*
	 * The low speed limit registers are read-only while monitoring
	 * is enabled, so we have to disable monitoring, then change the
	 * limit, and finally enable monitoring again.
	 */
	outb(0, iobase + PC87427_REG_FAN_STATUS);
	data->fan_min[nr] = fan_to_reg(val);
	outw(data->fan_min[nr], iobase + PC87427_REG_FAN_MIN);
	outb(FAN_STATUS_MONEN, iobase + PC87427_REG_FAN_STATUS);
	mutex_unlock(&data->lock);

	return count;
}

static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0);
static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1);
static SENSOR_DEVICE_ATTR_RO(fan3_input, fan_input, 2);
static SENSOR_DEVICE_ATTR_RO(fan4_input, fan_input, 3);
static SENSOR_DEVICE_ATTR_RO(fan5_input, fan_input, 4);
static SENSOR_DEVICE_ATTR_RO(fan6_input, fan_input, 5);
static SENSOR_DEVICE_ATTR_RO(fan7_input, fan_input, 6);
static SENSOR_DEVICE_ATTR_RO(fan8_input, fan_input, 7);

static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0);
static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);
static SENSOR_DEVICE_ATTR_RW(fan3_min, fan_min, 2);
static SENSOR_DEVICE_ATTR_RW(fan4_min, fan_min, 3);
static SENSOR_DEVICE_ATTR_RW(fan5_min, fan_min, 4);
static SENSOR_DEVICE_ATTR_RW(fan6_min, fan_min, 5);
static SENSOR_DEVICE_ATTR_RW(fan7_min, fan_min, 6);
static SENSOR_DEVICE_ATTR_RW(fan8_min, fan_min, 7);

static SENSOR_DEVICE_ATTR_RO(fan1_alarm, fan_alarm, 0);
static SENSOR_DEVICE_ATTR_RO(fan2_alarm, fan_alarm, 1);
static SENSOR_DEVICE_ATTR_RO(fan3_alarm, fan_alarm, 2);
static SENSOR_DEVICE_ATTR_RO(fan4_alarm, fan_alarm, 3);
static SENSOR_DEVICE_ATTR_RO(fan5_alarm, fan_alarm, 4);
static SENSOR_DEVICE_ATTR_RO(fan6_alarm, fan_alarm, 5);
static SENSOR_DEVICE_ATTR_RO(fan7_alarm, fan_alarm, 6);
static SENSOR_DEVICE_ATTR_RO(fan8_alarm, fan_alarm, 7);

static SENSOR_DEVICE_ATTR_RO(fan1_fault, fan_fault, 0);
static SENSOR_DEVICE_ATTR_RO(fan2_fault, fan_fault, 1);
static SENSOR_DEVICE_ATTR_RO(fan3_fault, fan_fault, 2);
static SENSOR_DEVICE_ATTR_RO(fan4_fault, fan_fault, 3);
static SENSOR_DEVICE_ATTR_RO(fan5_fault, fan_fault, 4);
static SENSOR_DEVICE_ATTR_RO(fan6_fault, fan_fault, 5);
static SENSOR_DEVICE_ATTR_RO(fan7_fault, fan_fault, 6);
static SENSOR_DEVICE_ATTR_RO(fan8_fault, fan_fault, 7);

static struct attribute *pc87427_attributes_fan[8][5] = {
	{
		&sensor_dev_attr_fan1_input.dev_attr.attr,
		&sensor_dev_attr_fan1_min.dev_attr.attr,
		&sensor_dev_attr_fan1_alarm.dev_attr.attr,
		&sensor_dev_attr_fan1_fault.dev_attr.attr,
		NULL
	}, {
		&sensor_dev_attr_fan2_input.dev_attr.attr,
		&sensor_dev_attr_fan2_min.dev_attr.attr,
		&sensor_dev_attr_fan2_alarm.dev_attr.attr,
		&sensor_dev_attr_fan2_fault.dev_attr.attr,
		NULL
	}, {
		&sensor_dev_attr_fan3_input.dev_attr.attr,
		&sensor_dev_attr_fan3_min.dev_attr.attr,
		&sensor_dev_attr_fan3_alarm.dev_attr.attr,
		&sensor_dev_attr_fan3_fault.dev_attr.attr,
		NULL
	}, {
		&sensor_dev_attr_fan4_input.dev_attr.attr,
		&sensor_dev_attr_fan4_min.dev_attr.attr,
		&sensor_dev_attr_fan4_alarm.dev_attr.attr,
		&sensor_dev_attr_fan4_fault.dev_attr.attr,
		NULL
	}, {
		&sensor_dev_attr_fan5_input.dev_attr.attr,
		&sensor_dev_attr_fan5_min.dev_attr.attr,
		&sensor_dev_attr_fan5_alarm.dev_attr.attr,
		&sensor_dev_attr_fan5_fault.dev_attr.attr,
		NULL
	}, {
		&sensor_dev_attr_fan6_input.dev_attr.attr,
		&sensor_dev_attr_fan6_min.dev_attr.attr,
		&sensor_dev_attr_fan6_alarm.dev_attr.attr,
		&sensor_dev_attr_fan6_fault.dev_attr.attr,
		NULL
	}, {
		&sensor_dev_attr_fan7_input.dev_attr.attr,
		&sensor_dev_attr_fan7_min.dev_attr.attr,
		&sensor_dev_attr_fan7_alarm.dev_attr.attr,
		&sensor_dev_attr_fan7_fault.dev_attr.attr,
		NULL
	}, {
		&sensor_dev_attr_fan8_input.dev_attr.attr,
		&sensor_dev_attr_fan8_min.dev_attr.attr,
		&sensor_dev_attr_fan8_alarm.dev_attr.attr,
		&sensor_dev_attr_fan8_fault.dev_attr.attr,
		NULL
	}
};

static const struct attribute_group pc87427_group_fan[8] = {
	{ .attrs = pc87427_attributes_fan[0] },
	{ .attrs = pc87427_attributes_fan[1] },
	{ .attrs = pc87427_attributes_fan[2] },
	{ .attrs = pc87427_attributes_fan[3] },
	{ .attrs = pc87427_attributes_fan[4] },
	{ .attrs = pc87427_attributes_fan[5] },
	{ .attrs = pc87427_attributes_fan[6] },
	{ .attrs = pc87427_attributes_fan[7] },
};

/*
 * Must be called with data->lock held and pc87427_readall_pwm() freshly
 * called
 */
static void update_pwm_enable(struct pc87427_data *data, int nr, u8 mode)
{
	int iobase = data->address[LD_FAN];
	data->pwm_enable[nr] &= ~PWM_ENABLE_MODE_MASK;
	data->pwm_enable[nr] |= mode;
	outb(data->pwm_enable[nr], iobase + PC87427_REG_PWM_ENABLE);
}

static ssize_t pwm_enable_show(struct device *dev,
			       struct device_attribute *devattr, char *buf)
{
	struct pc87427_data *data = pc87427_update_device(dev);
	int nr = to_sensor_dev_attr(devattr)->index;
	int pwm_enable;

	pwm_enable = pwm_enable_from_reg(data->pwm_enable[nr]);
	if (pwm_enable < 0)
		return pwm_enable;
	return sprintf(buf, "%d\n", pwm_enable);
}

static ssize_t pwm_enable_store(struct device *dev,
				struct device_attribute *devattr,
				const char *buf, size_t count)
{
	struct pc87427_data *data = dev_get_drvdata(dev);
	int nr = to_sensor_dev_attr(devattr)->index;
	unsigned long val;

	if (kstrtoul(buf, 10, &val) < 0 || val > 2)
		return -EINVAL;
	/* Can't go to automatic mode if it isn't configured */
	if (val == 2 && !(data->pwm_auto_ok & (1 << nr)))
		return -EINVAL;

	mutex_lock(&data->lock);
	pc87427_readall_pwm(data, nr);
	update_pwm_enable(data, nr, pwm_enable_to_reg(val, data->pwm[nr]));
	mutex_unlock(&data->lock);

	return count;
}

static ssize_t pwm_show(struct device *dev, struct device_attribute *devattr,
			char *buf)
{
	struct pc87427_data *data = pc87427_update_device(dev);
	int nr = to_sensor_dev_attr(devattr)->index;

	return sprintf(buf, "%d\n", (int)data->pwm[nr]);
}

static ssize_t pwm_store(struct device *dev, struct device_attribute *devattr,
			 const char *buf, size_t count)
{
	struct pc87427_data *data = dev_get_drvdata(dev);
	int nr = to_sensor_dev_attr(devattr)->index;
	unsigned long val;
	int iobase = data->address[LD_FAN];
	u8 mode;

	if (kstrtoul(buf, 10, &val) < 0 || val > 0xff)
		return -EINVAL;

	mutex_lock(&data->lock);
	pc87427_readall_pwm(data, nr);
	mode = data->pwm_enable[nr] & PWM_ENABLE_MODE_MASK;
	if (mode != PWM_MODE_MANUAL && mode != PWM_MODE_OFF) {
		dev_notice(dev,
			   "Can't set PWM%d duty cycle while not in manual mode\n",
			   nr + 1);
		mutex_unlock(&data->lock);
		return -EPERM;
	}

	/* We may have to change the mode */
	if (mode == PWM_MODE_MANUAL && val == 0) {
		/* Transition from Manual to Off */
		update_pwm_enable(data, nr, PWM_MODE_OFF);
		mode = PWM_MODE_OFF;
		dev_dbg(dev, "Switching PWM%d from %s to %s\n", nr + 1,
			"manual", "off");
	} else if (mode == PWM_MODE_OFF && val != 0) {
		/* Transition from Off to Manual */
		update_pwm_enable(data, nr, PWM_MODE_MANUAL);
		mode = PWM_MODE_MANUAL;
		dev_dbg(dev, "Switching PWM%d from %s to %s\n", nr + 1,
			"off", "manual");
	}

	data->pwm[nr] = val;
	if (mode == PWM_MODE_MANUAL)
		outb(val, iobase + PC87427_REG_PWM_DUTY);
	mutex_unlock(&data->lock);

	return count;
}

static SENSOR_DEVICE_ATTR_RW(pwm1_enable, pwm_enable, 0);
static SENSOR_DEVICE_ATTR_RW(pwm2_enable, pwm_enable, 1);
static SENSOR_DEVICE_ATTR_RW(pwm3_enable, pwm_enable, 2);
static SENSOR_DEVICE_ATTR_RW(pwm4_enable, pwm_enable, 3);

static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0);
static SENSOR_DEVICE_ATTR_RW(pwm2, pwm, 1);
static SENSOR_DEVICE_ATTR_RW(pwm3, pwm, 2);
static SENSOR_DEVICE_ATTR_RW(pwm4, pwm, 3);

static struct attribute *pc87427_attributes_pwm[4][3] = {
	{
		&sensor_dev_attr_pwm1_enable.dev_attr.attr,
		&sensor_dev_attr_pwm1.dev_attr.attr,
		NULL
	}, {
		&sensor_dev_attr_pwm2_enable.dev_attr.attr,
		&sensor_dev_attr_pwm2.dev_attr.attr,
		NULL
	}, {
		&sensor_dev_attr_pwm3_enable.dev_attr.attr,
		&sensor_dev_attr_pwm3.dev_attr.attr,
		NULL
	}, {
		&sensor_dev_attr_pwm4_enable.dev_attr.attr,
		&sensor_dev_attr_pwm4.dev_attr.attr,
		NULL
	}
};

static const struct attribute_group pc87427_group_pwm[4] = {
	{ .attrs = pc87427_attributes_pwm[0] },
	{ .attrs = pc87427_attributes_pwm[1] },
	{ .attrs = pc87427_attributes_pwm[2] },
	{ .attrs = pc87427_attributes_pwm[3] },
};

static ssize_t temp_input_show(struct device *dev,
			       struct device_attribute *devattr, char *buf)
{
	struct pc87427_data *data = pc87427_update_device(dev);
	int nr = to_sensor_dev_attr(devattr)->index;

	return sprintf(buf, "%ld\n", temp_from_reg(data->temp[nr]));
}

static ssize_t temp_min_show(struct device *dev,
			     struct device_attribute *devattr, char *buf)
{
	struct pc87427_data *data = pc87427_update_device(dev);
	int nr = to_sensor_dev_attr(devattr)->index;

	return sprintf(buf, "%ld\n", temp_from_reg8(data->temp_min[nr]));
}

static ssize_t temp_max_show(struct device *dev,
			     struct device_attribute *devattr, char *buf)
{
	struct pc87427_data *data = pc87427_update_device(dev);
	int nr = to_sensor_dev_attr(devattr)->index;

	return sprintf(buf, "%ld\n", temp_from_reg8(data->temp_max[nr]));
}

static ssize_t temp_crit_show(struct device *dev,
			      struct device_attribute *devattr, char *buf)
{
	struct pc87427_data *data = pc87427_update_device(dev);
	int nr = to_sensor_dev_attr(devattr)->index;

	return sprintf(buf, "%ld\n", temp_from_reg8(data->temp_crit[nr]));
}

static ssize_t temp_type_show(struct device *dev,
			      struct device_attribute *devattr, char *buf)
{
	struct pc87427_data *data = pc87427_update_device(dev);
	int nr = to_sensor_dev_attr(devattr)->index;

	return sprintf(buf, "%u\n", temp_type_from_reg(data->temp_type[nr]));
}

static ssize_t temp_min_alarm_show(struct device *dev,
				   struct device_attribute *devattr,
				   char *buf)
{
	struct pc87427_data *data = pc87427_update_device(dev);
	int nr = to_sensor_dev_attr(devattr)->index;

	return sprintf(buf, "%d\n", !!(data->temp_status[nr]
				       & TEMP_STATUS_LOWFLG));
}

static ssize_t temp_max_alarm_show(struct device *dev,
				   struct device_attribute *devattr,
				   char *buf)
{
	struct pc87427_data *data = pc87427_update_device(dev);
	int nr = to_sensor_dev_attr(devattr)->index;

	return sprintf(buf, "%d\n", !!(data->temp_status[nr]
				       & TEMP_STATUS_HIGHFLG));
}

static ssize_t temp_crit_alarm_show(struct device *dev,
				    struct device_attribute *devattr,
				    char *buf)
{
	struct pc87427_data *data = pc87427_update_device(dev);
	int nr = to_sensor_dev_attr(devattr)->index;

	return sprintf(buf, "%d\n", !!(data->temp_status[nr]
				       & TEMP_STATUS_CRITFLG));
}

static ssize_t temp_fault_show(struct device *dev,
			       struct device_attribute *devattr, char *buf)
{
	struct pc87427_data *data = pc87427_update_device(dev);
	int nr = to_sensor_dev_attr(devattr)->index;

	return sprintf(buf, "%d\n", !!(data->temp_status[nr]
				       & TEMP_STATUS_SENSERR));
}

static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_input, 2);
static SENSOR_DEVICE_ATTR_RO(temp4_input, temp_input, 3);
static SENSOR_DEVICE_ATTR_RO(temp5_input, temp_input, 4);
static SENSOR_DEVICE_ATTR_RO(temp6_input, temp_input, 5);

static SENSOR_DEVICE_ATTR_RO(temp1_min, temp_min, 0);
static SENSOR_DEVICE_ATTR_RO(temp2_min, temp_min, 1);
static SENSOR_DEVICE_ATTR_RO(temp3_min, temp_min, 2);
static SENSOR_DEVICE_ATTR_RO(temp4_min, temp_min, 3);
static SENSOR_DEVICE_ATTR_RO(temp5_min, temp_min, 4);
static SENSOR_DEVICE_ATTR_RO(temp6_min, temp_min, 5);

static SENSOR_DEVICE_ATTR_RO(temp1_max, temp_max, 0);
static SENSOR_DEVICE_ATTR_RO(temp2_max, temp_max, 1);
static SENSOR_DEVICE_ATTR_RO(temp3_max, temp_max, 2);
static SENSOR_DEVICE_ATTR_RO(temp4_max, temp_max, 3);
static SENSOR_DEVICE_ATTR_RO(temp5_max, temp_max, 4);
static SENSOR_DEVICE_ATTR_RO(temp6_max, temp_max, 5);

static SENSOR_DEVICE_ATTR_RO(temp1_crit, temp_crit, 0);
static SENSOR_DEVICE_ATTR_RO(temp2_crit, temp_crit, 1);
static SENSOR_DEVICE_ATTR_RO(temp3_crit, temp_crit, 2);
static SENSOR_DEVICE_ATTR_RO(temp4_crit, temp_crit, 3);
static SENSOR_DEVICE_ATTR_RO(temp5_crit, temp_crit, 4);
static SENSOR_DEVICE_ATTR_RO(temp6_crit, temp_crit, 5);

static SENSOR_DEVICE_ATTR_RO(temp1_type, temp_type, 0);
static SENSOR_DEVICE_ATTR_RO(temp2_type, temp_type, 1);
static SENSOR_DEVICE_ATTR_RO(temp3_type, temp_type, 2);
static SENSOR_DEVICE_ATTR_RO(temp4_type, temp_type, 3);
static SENSOR_DEVICE_ATTR_RO(temp5_type, temp_type, 4);
static SENSOR_DEVICE_ATTR_RO(temp6_type, temp_type, 5);

static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, temp_min_alarm, 0);
static SENSOR_DEVICE_ATTR_RO(temp2_min_alarm, temp_min_alarm, 1);
static SENSOR_DEVICE_ATTR_RO(temp3_min_alarm, temp_min_alarm, 2);
static SENSOR_DEVICE_ATTR_RO(temp4_min_alarm, temp_min_alarm, 3);
static SENSOR_DEVICE_ATTR_RO(temp5_min_alarm, temp_min_alarm, 4);
static SENSOR_DEVICE_ATTR_RO(temp6_min_alarm, temp_min_alarm, 5);

static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, temp_max_alarm, 0);
static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, temp_max_alarm, 1);
static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, temp_max_alarm, 2);
static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, temp_max_alarm, 3);
static SENSOR_DEVICE_ATTR_RO(temp5_max_alarm, temp_max_alarm, 4);
static SENSOR_DEVICE_ATTR_RO(temp6_max_alarm, temp_max_alarm, 5);

static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, temp_crit_alarm, 0);
static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, temp_crit_alarm, 1);
static SENSOR_DEVICE_ATTR_RO(temp3_crit_alarm, temp_crit_alarm, 2);
static SENSOR_DEVICE_ATTR_RO(temp4_crit_alarm, temp_crit_alarm, 3);
static SENSOR_DEVICE_ATTR_RO(temp5_crit_alarm, temp_crit_alarm, 4);
static SENSOR_DEVICE_ATTR_RO(temp6_crit_alarm, temp_crit_alarm, 5);

static SENSOR_DEVICE_ATTR_RO(temp1_fault, temp_fault, 0);
static SENSOR_DEVICE_ATTR_RO(temp2_fault, temp_fault, 1);
static SENSOR_DEVICE_ATTR_RO(temp3_fault, temp_fault, 2);
static SENSOR_DEVICE_ATTR_RO(temp4_fault, temp_fault, 3);
static SENSOR_DEVICE_ATTR_RO(temp5_fault, temp_fault, 4);
static SENSOR_DEVICE_ATTR_RO(temp6_fault, temp_fault, 5);

static struct attribute *pc87427_attributes_temp[6][10] = {
	{
		&sensor_dev_attr_temp1_input.dev_attr.attr,
		&sensor_dev_attr_temp1_min.dev_attr.attr,
		&sensor_dev_attr_temp1_max.dev_attr.attr,
		&sensor_dev_attr_temp1_crit.dev_attr.attr,
		&sensor_dev_attr_temp1_type.dev_attr.attr,
		&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
		&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
		&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
		&sensor_dev_attr_temp1_fault.dev_attr.attr,
		NULL
	}, {
		&sensor_dev_attr_temp2_input.dev_attr.attr,
		&sensor_dev_attr_temp2_min.dev_attr.attr,
		&sensor_dev_attr_temp2_max.dev_attr.attr,
		&sensor_dev_attr_temp2_crit.dev_attr.attr,
		&sensor_dev_attr_temp2_type.dev_attr.attr,
		&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
		&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
		&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
		&sensor_dev_attr_temp2_fault.dev_attr.attr,
		NULL
	}, {
		&sensor_dev_attr_temp3_input.dev_attr.attr,
		&sensor_dev_attr_temp3_min.dev_attr.attr,
		&sensor_dev_attr_temp3_max.dev_attr.attr,
		&sensor_dev_attr_temp3_crit.dev_attr.attr,
		&sensor_dev_attr_temp3_type.dev_attr.attr,
		&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
		&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
		&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
		&sensor_dev_attr_temp3_fault.dev_attr.attr,
		NULL
	}, {
		&sensor_dev_attr_temp4_input.dev_attr.attr,
		&sensor_dev_attr_temp4_min.dev_attr.attr,
		&sensor_dev_attr_temp4_max.dev_attr.attr,
		&sensor_dev_attr_temp4_crit.dev_attr.attr,
		&sensor_dev_attr_temp4_type.dev_attr.attr,
		&sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
		&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
		&sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
		&sensor_dev_attr_temp4_fault.dev_attr.attr,
		NULL
	}, {
		&sensor_dev_attr_temp5_input.dev_attr.attr,
		&sensor_dev_attr_temp5_min.dev_attr.attr,
		&sensor_dev_attr_temp5_max.dev_attr.attr,
		&sensor_dev_attr_temp5_crit.dev_attr.attr,
		&sensor_dev_attr_temp5_type.dev_attr.attr,
		&sensor_dev_attr_temp5_min_alarm.dev_attr.attr,
		&sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
		&sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,
		&sensor_dev_attr_temp5_fault.dev_attr.attr,
		NULL
	}, {
		&sensor_dev_attr_temp6_input.dev_attr.attr,
		&sensor_dev_attr_temp6_min.dev_attr.attr,
		&sensor_dev_attr_temp6_max.dev_attr.attr,
		&sensor_dev_attr_temp6_crit.dev_attr.attr,
		&sensor_dev_attr_temp6_type.dev_attr.attr,
		&sensor_dev_attr_temp6_min_alarm.dev_attr.attr,
		&sensor_dev_attr_temp6_max_alarm.dev_attr.attr,
		&sensor_dev_attr_temp6_crit_alarm.dev_attr.attr,
		&sensor_dev_attr_temp6_fault.dev_attr.attr,
		NULL
	}
};

static const struct attribute_group pc87427_group_temp[6] = {
	{ .attrs = pc87427_attributes_temp[0] },
	{ .attrs = pc87427_attributes_temp[1] },
	{ .attrs = pc87427_attributes_temp[2] },
	{ .attrs = pc87427_attributes_temp[3] },
	{ .attrs = pc87427_attributes_temp[4] },
	{ .attrs = pc87427_attributes_temp[5] },
};

static ssize_t name_show(struct device *dev, struct device_attribute
			 *devattr, char *buf)
{
	struct pc87427_data *data = dev_get_drvdata(dev);

	return sprintf(buf, "%s\n", data->name);
}
static DEVICE_ATTR_RO(name);


/*
 * Device detection, attach and detach
 */

static int pc87427_request_regions(struct platform_device *pdev,
					     int count)
{
	struct resource *res;
	int i;

	for (i = 0; i < count; i++) {
		res = platform_get_resource(pdev, IORESOURCE_IO, i);
		if (!res) {
			dev_err(&pdev->dev, "Missing resource #%d\n", i);
			return -ENOENT;
		}
		if (!devm_request_region(&pdev->dev, res->start,
					 resource_size(res), DRVNAME)) {
			dev_err(&pdev->dev,
				"Failed to request region 0x%lx-0x%lx\n",
				(unsigned long)res->start,
				(unsigned long)res->end);
			return -EBUSY;
		}
	}
	return 0;
}

static void pc87427_init_device(struct device *dev)
{
	struct pc87427_sio_data *sio_data = dev_get_platdata(dev);
	struct pc87427_data *data = dev_get_drvdata(dev);
	int i;
	u8 reg;

	/* The FMC module should be ready */
	reg = pc87427_read8(data, LD_FAN, PC87427_REG_BANK);
	if (!(reg & 0x80))
		dev_warn(dev, "%s module not ready!\n", "FMC");

	/* Check which fans are enabled */
	for (i = 0; i < 8; i++) {
		if (!(sio_data->has_fanin & (1 << i)))	/* Not wired */
			continue;
		reg = pc87427_read8_bank(data, LD_FAN, BANK_FM(i),
					 PC87427_REG_FAN_STATUS);
		if (reg & FAN_STATUS_MONEN)
			data->fan_enabled |= (1 << i);
	}

	if (!data->fan_enabled) {
		dev_dbg(dev, "Enabling monitoring of all fans\n");
		for (i = 0; i < 8; i++) {
			if (!(sio_data->has_fanin & (1 << i)))	/* Not wired */
				continue;
			pc87427_write8_bank(data, LD_FAN, BANK_FM(i),
					    PC87427_REG_FAN_STATUS,
					    FAN_STATUS_MONEN);
		}
		data->fan_enabled = sio_data->has_fanin;
	}

	/* Check which PWM outputs are enabled */
	for (i = 0; i < 4; i++) {
		if (!(sio_data->has_fanout & (1 << i)))	/* Not wired */
			continue;
		reg = pc87427_read8_bank(data, LD_FAN, BANK_FC(i),
					 PC87427_REG_PWM_ENABLE);
		if (reg & PWM_ENABLE_CTLEN)
			data->pwm_enabled |= (1 << i);

		/*
		 * We don't expose an interface to reconfigure the automatic
		 * fan control mode, so only allow to return to this mode if
		 * it was originally set.
		 */
		if ((reg & PWM_ENABLE_MODE_MASK) == PWM_MODE_AUTO) {
			dev_dbg(dev, "PWM%d is in automatic control mode\n",
				i + 1);
			data->pwm_auto_ok |= (1 << i);
		}
	}

	/* The HMC module should be ready */
	reg = pc87427_read8(data, LD_TEMP, PC87427_REG_BANK);
	if (!(reg & 0x80))
		dev_warn(dev, "%s module not ready!\n", "HMC");

	/* Check which temperature channels are enabled */
	for (i = 0; i < 6; i++) {
		reg = pc87427_read8_bank(data, LD_TEMP, BANK_TM(i),
					 PC87427_REG_TEMP_STATUS);
		if (reg & TEMP_STATUS_CHANEN)
			data->temp_enabled |= (1 << i);
	}
}

static void pc87427_remove_files(struct device *dev)
{
	struct pc87427_data *data = dev_get_drvdata(dev);
	int i;

	device_remove_file(dev, &dev_attr_name);
	for (i = 0; i < 8; i++) {
		if (!(data->fan_enabled & (1 << i)))
			continue;
		sysfs_remove_group(&dev->kobj, &pc87427_group_fan[i]);
	}
	for (i = 0; i < 4; i++) {
		if (!(data->pwm_enabled & (1 << i)))
			continue;
		sysfs_remove_group(&dev->kobj, &pc87427_group_pwm[i]);
	}
	for (i = 0; i < 6; i++) {
		if (!(data->temp_enabled & (1 << i)))
			continue;
		sysfs_remove_group(&dev->kobj, &pc87427_group_temp[i]);
	}
}

static int pc87427_probe(struct platform_device *pdev)
{
	struct pc87427_sio_data *sio_data = dev_get_platdata(&pdev->dev);
	struct pc87427_data *data;
	int i, err, res_count;

	data = devm_kzalloc(&pdev->dev, sizeof(struct pc87427_data),
			    GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->address[0] = sio_data->address[0];
	data->address[1] = sio_data->address[1];
	res_count = (data->address[0] != 0) + (data->address[1] != 0);

	err = pc87427_request_regions(pdev, res_count);
	if (err)
		return err;

	mutex_init(&data->lock);
	data->name = "pc87427";
	platform_set_drvdata(pdev, data);
	pc87427_init_device(&pdev->dev);

	/* Register sysfs hooks */
	err = device_create_file(&pdev->dev, &dev_attr_name);
	if (err)
		return err;
	for (i = 0; i < 8; i++) {
		if (!(data->fan_enabled & (1 << i)))
			continue;
		err = sysfs_create_group(&pdev->dev.kobj,
					 &pc87427_group_fan[i]);
		if (err)
			goto exit_remove_files;
	}
	for (i = 0; i < 4; i++) {
		if (!(data->pwm_enabled & (1 << i)))
			continue;
		err = sysfs_create_group(&pdev->dev.kobj,
					 &pc87427_group_pwm[i]);
		if (err)
			goto exit_remove_files;
	}
	for (i = 0; i < 6; i++) {
		if (!(data->temp_enabled & (1 << i)))
			continue;
		err = sysfs_create_group(&pdev->dev.kobj,
					 &pc87427_group_temp[i]);
		if (err)
			goto exit_remove_files;
	}

	data->hwmon_dev = hwmon_device_register(&pdev->dev);
	if (IS_ERR(data->hwmon_dev)) {
		err = PTR_ERR(data->hwmon_dev);
		dev_err(&pdev->dev, "Class registration failed (%d)\n", err);
		goto exit_remove_files;
	}

	return 0;

exit_remove_files:
	pc87427_remove_files(&pdev->dev);
	return err;
}

static int pc87427_remove(struct platform_device *pdev)
{
	struct pc87427_data *data = platform_get_drvdata(pdev);

	hwmon_device_unregister(data->hwmon_dev);
	pc87427_remove_files(&pdev->dev);

	return 0;
}


static struct platform_driver pc87427_driver = {
	.driver = {
		.name	= DRVNAME,
	},
	.probe		= pc87427_probe,
	.remove		= pc87427_remove,
};

static int __init pc87427_device_add(const struct pc87427_sio_data *sio_data)
{
	struct resource res[2] = {
		{ .flags	= IORESOURCE_IO },
		{ .flags	= IORESOURCE_IO },
	};
	int err, i, res_count;

	res_count = 0;
	for (i = 0; i < 2; i++) {
		if (!sio_data->address[i])
			continue;
		res[res_count].start = sio_data->address[i];
		res[res_count].end = sio_data->address[i] + REGION_LENGTH - 1;
		res[res_count].name = logdev_str[i];

		err = acpi_check_resource_conflict(&res[res_count]);
		if (err)
			goto exit;

		res_count++;
	}

	pdev = platform_device_alloc(DRVNAME, res[0].start);
	if (!pdev) {
		err = -ENOMEM;
		pr_err("Device allocation failed\n");
		goto exit;
	}

	err = platform_device_add_resources(pdev, res, res_count);
	if (err) {
		pr_err("Device resource addition failed (%d)\n", err);
		goto exit_device_put;
	}

	err = platform_device_add_data(pdev, sio_data,
				       sizeof(struct pc87427_sio_data));
	if (err) {
		pr_err("Platform data allocation failed\n");
		goto exit_device_put;
	}

	err = platform_device_add(pdev);
	if (err) {
		pr_err("Device addition failed (%d)\n", err);
		goto exit_device_put;
	}

	return 0;

exit_device_put:
	platform_device_put(pdev);
exit:
	return err;
}

static int __init pc87427_find(int sioaddr, struct pc87427_sio_data *sio_data)
{
	u16 val;
	u8 cfg, cfg_b;
	int i, err;

	err = superio_enter(sioaddr);
	if (err)
		return err;

	/* Identify device */
	val = force_id ? force_id : superio_inb(sioaddr, SIOREG_DEVID);
	if (val != 0xf2) {	/* PC87427 */
		err = -ENODEV;
		goto exit;
	}

	for (i = 0; i < 2; i++) {
		sio_data->address[i] = 0;
		/* Select logical device */
		superio_outb(sioaddr, SIOREG_LDSEL, logdev[i]);

		val = superio_inb(sioaddr, SIOREG_ACT);
		if (!(val & 0x01)) {
			pr_info("Logical device 0x%02x not activated\n",
				logdev[i]);
			continue;
		}

		val = superio_inb(sioaddr, SIOREG_MAP);
		if (val & 0x01) {
			pr_warn("Logical device 0x%02x is memory-mapped, can't use\n",
				logdev[i]);
			continue;
		}

		val = (superio_inb(sioaddr, SIOREG_IOBASE) << 8)
		    | superio_inb(sioaddr, SIOREG_IOBASE + 1);
		if (!val) {
			pr_info("I/O base address not set for logical device 0x%02x\n",
				logdev[i]);
			continue;
		}
		sio_data->address[i] = val;
	}

	/* No point in loading the driver if everything is disabled */
	if (!sio_data->address[0] && !sio_data->address[1]) {
		err = -ENODEV;
		goto exit;
	}

	/* Check which fan inputs are wired */
	sio_data->has_fanin = (1 << 2) | (1 << 3);	/* FANIN2, FANIN3 */

	cfg = superio_inb(sioaddr, SIOREG_CF2);
	if (!(cfg & (1 << 3)))
		sio_data->has_fanin |= (1 << 0);	/* FANIN0 */
	if (!(cfg & (1 << 2)))
		sio_data->has_fanin |= (1 << 4);	/* FANIN4 */

	cfg = superio_inb(sioaddr, SIOREG_CFD);
	if (!(cfg & (1 << 0)))
		sio_data->has_fanin |= (1 << 1);	/* FANIN1 */

	cfg = superio_inb(sioaddr, SIOREG_CF4);
	if (!(cfg & (1 << 0)))
		sio_data->has_fanin |= (1 << 7);	/* FANIN7 */
	cfg_b = superio_inb(sioaddr, SIOREG_CFB);
	if (!(cfg & (1 << 1)) && (cfg_b & (1 << 3)))
		sio_data->has_fanin |= (1 << 5);	/* FANIN5 */
	cfg = superio_inb(sioaddr, SIOREG_CF3);
	if ((cfg & (1 << 3)) && !(cfg_b & (1 << 5)))
		sio_data->has_fanin |= (1 << 6);	/* FANIN6 */

	/* Check which fan outputs are wired */
	sio_data->has_fanout = (1 << 0);		/* FANOUT0 */
	if (cfg_b & (1 << 0))
		sio_data->has_fanout |= (1 << 3);	/* FANOUT3 */

	cfg = superio_inb(sioaddr, SIOREG_CFC);
	if (!(cfg & (1 << 4))) {
		if (cfg_b & (1 << 1))
			sio_data->has_fanout |= (1 << 1); /* FANOUT1 */
		if (cfg_b & (1 << 2))
			sio_data->has_fanout |= (1 << 2); /* FANOUT2 */
	}

	/* FANOUT1 and FANOUT2 can each be routed to 2 different pins */
	cfg = superio_inb(sioaddr, SIOREG_CF5);
	if (cfg & (1 << 6))
		sio_data->has_fanout |= (1 << 1);	/* FANOUT1 */
	if (cfg & (1 << 5))
		sio_data->has_fanout |= (1 << 2);	/* FANOUT2 */

exit:
	superio_exit(sioaddr);
	return err;
}

static int __init pc87427_init(void)
{
	int err;
	struct pc87427_sio_data sio_data;

	if (pc87427_find(0x2e, &sio_data)
	 && pc87427_find(0x4e, &sio_data))
		return -ENODEV;

	err = platform_driver_register(&pc87427_driver);
	if (err)
		goto exit;

	/* Sets global pdev as a side effect */
	err = pc87427_device_add(&sio_data);
	if (err)
		goto exit_driver;

	return 0;

exit_driver:
	platform_driver_unregister(&pc87427_driver);
exit:
	return err;
}

static void __exit pc87427_exit(void)
{
	platform_device_unregister(pdev);
	platform_driver_unregister(&pc87427_driver);
}

MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
MODULE_DESCRIPTION("PC87427 hardware monitoring driver");
MODULE_LICENSE("GPL");

module_init(pc87427_init);
module_exit(pc87427_exit);