summaryrefslogtreecommitdiffstats
path: root/drivers/hwmon/hwmon.c
blob: 3501a3ead4ba608d6f4f571c20bc0ac49f60649f (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * hwmon.c - part of lm_sensors, Linux kernel modules for hardware monitoring
 *
 * This file defines the sysfs class "hwmon", for use by sensors drivers.
 *
 * Copyright (C) 2005 Mark M. Hoffman <mhoffman@lightlink.com>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/gfp.h>
#include <linux/hwmon.h>
#include <linux/idr.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/thermal.h>

#define CREATE_TRACE_POINTS
#include <trace/events/hwmon.h>

#define HWMON_ID_PREFIX "hwmon"
#define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"

struct hwmon_device {
	const char *name;
	struct device dev;
	const struct hwmon_chip_info *chip;
	struct list_head tzdata;
	struct attribute_group group;
	const struct attribute_group **groups;
};

#define to_hwmon_device(d) container_of(d, struct hwmon_device, dev)

#define MAX_SYSFS_ATTR_NAME_LENGTH	32

struct hwmon_device_attribute {
	struct device_attribute dev_attr;
	const struct hwmon_ops *ops;
	enum hwmon_sensor_types type;
	u32 attr;
	int index;
	char name[MAX_SYSFS_ATTR_NAME_LENGTH];
};

#define to_hwmon_attr(d) \
	container_of(d, struct hwmon_device_attribute, dev_attr)
#define to_dev_attr(a) container_of(a, struct device_attribute, attr)

/*
 * Thermal zone information
 */
struct hwmon_thermal_data {
	struct list_head node;		/* hwmon tzdata list entry */
	struct device *dev;		/* Reference to hwmon device */
	int index;			/* sensor index */
	struct thermal_zone_device *tzd;/* thermal zone device */
};

static ssize_t
name_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "%s\n", to_hwmon_device(dev)->name);
}
static DEVICE_ATTR_RO(name);

static struct attribute *hwmon_dev_attrs[] = {
	&dev_attr_name.attr,
	NULL
};

static umode_t hwmon_dev_name_is_visible(struct kobject *kobj,
					 struct attribute *attr, int n)
{
	struct device *dev = kobj_to_dev(kobj);

	if (to_hwmon_device(dev)->name == NULL)
		return 0;

	return attr->mode;
}

static const struct attribute_group hwmon_dev_attr_group = {
	.attrs		= hwmon_dev_attrs,
	.is_visible	= hwmon_dev_name_is_visible,
};

static const struct attribute_group *hwmon_dev_attr_groups[] = {
	&hwmon_dev_attr_group,
	NULL
};

static void hwmon_free_attrs(struct attribute **attrs)
{
	int i;

	for (i = 0; attrs[i]; i++) {
		struct device_attribute *dattr = to_dev_attr(attrs[i]);
		struct hwmon_device_attribute *hattr = to_hwmon_attr(dattr);

		kfree(hattr);
	}
	kfree(attrs);
}

static void hwmon_dev_release(struct device *dev)
{
	struct hwmon_device *hwdev = to_hwmon_device(dev);

	if (hwdev->group.attrs)
		hwmon_free_attrs(hwdev->group.attrs);
	kfree(hwdev->groups);
	kfree(hwdev);
}

static struct class hwmon_class = {
	.name = "hwmon",
	.owner = THIS_MODULE,
	.dev_groups = hwmon_dev_attr_groups,
	.dev_release = hwmon_dev_release,
};

static DEFINE_IDA(hwmon_ida);

/* Thermal zone handling */

/*
 * The complex conditional is necessary to avoid a cyclic dependency
 * between hwmon and thermal_sys modules.
 */
#ifdef CONFIG_THERMAL_OF
static int hwmon_thermal_get_temp(void *data, int *temp)
{
	struct hwmon_thermal_data *tdata = data;
	struct hwmon_device *hwdev = to_hwmon_device(tdata->dev);
	int ret;
	long t;

	ret = hwdev->chip->ops->read(tdata->dev, hwmon_temp, hwmon_temp_input,
				     tdata->index, &t);
	if (ret < 0)
		return ret;

	*temp = t;

	return 0;
}

static int hwmon_thermal_set_trips(void *data, int low, int high)
{
	struct hwmon_thermal_data *tdata = data;
	struct hwmon_device *hwdev = to_hwmon_device(tdata->dev);
	const struct hwmon_chip_info *chip = hwdev->chip;
	const struct hwmon_channel_info **info = chip->info;
	unsigned int i;
	int err;

	if (!chip->ops->write)
		return 0;

	for (i = 0; info[i] && info[i]->type != hwmon_temp; i++)
		continue;

	if (!info[i])
		return 0;

	if (info[i]->config[tdata->index] & HWMON_T_MIN) {
		err = chip->ops->write(tdata->dev, hwmon_temp,
				       hwmon_temp_min, tdata->index, low);
		if (err && err != -EOPNOTSUPP)
			return err;
	}

	if (info[i]->config[tdata->index] & HWMON_T_MAX) {
		err = chip->ops->write(tdata->dev, hwmon_temp,
				       hwmon_temp_max, tdata->index, high);
		if (err && err != -EOPNOTSUPP)
			return err;
	}

	return 0;
}

static const struct thermal_zone_of_device_ops hwmon_thermal_ops = {
	.get_temp = hwmon_thermal_get_temp,
	.set_trips = hwmon_thermal_set_trips,
};

static void hwmon_thermal_remove_sensor(void *data)
{
	list_del(data);
}

static int hwmon_thermal_add_sensor(struct device *dev, int index)
{
	struct hwmon_device *hwdev = to_hwmon_device(dev);
	struct hwmon_thermal_data *tdata;
	struct thermal_zone_device *tzd;
	int err;

	tdata = devm_kzalloc(dev, sizeof(*tdata), GFP_KERNEL);
	if (!tdata)
		return -ENOMEM;

	tdata->dev = dev;
	tdata->index = index;

	tzd = devm_thermal_zone_of_sensor_register(dev, index, tdata,
						   &hwmon_thermal_ops);
	/*
	 * If CONFIG_THERMAL_OF is disabled, this returns -ENODEV,
	 * so ignore that error but forward any other error.
	 */
	if (IS_ERR(tzd) && (PTR_ERR(tzd) != -ENODEV))
		return PTR_ERR(tzd);

	err = devm_add_action(dev, hwmon_thermal_remove_sensor, &tdata->node);
	if (err)
		return err;

	tdata->tzd = tzd;
	list_add(&tdata->node, &hwdev->tzdata);

	return 0;
}

static int hwmon_thermal_register_sensors(struct device *dev)
{
	struct hwmon_device *hwdev = to_hwmon_device(dev);
	const struct hwmon_chip_info *chip = hwdev->chip;
	const struct hwmon_channel_info **info = chip->info;
	void *drvdata = dev_get_drvdata(dev);
	int i;

	for (i = 1; info[i]; i++) {
		int j;

		if (info[i]->type != hwmon_temp)
			continue;

		for (j = 0; info[i]->config[j]; j++) {
			int err;

			if (!(info[i]->config[j] & HWMON_T_INPUT) ||
			    !chip->ops->is_visible(drvdata, hwmon_temp,
						   hwmon_temp_input, j))
				continue;

			err = hwmon_thermal_add_sensor(dev, j);
			if (err)
				return err;
		}
	}

	return 0;
}

static void hwmon_thermal_notify(struct device *dev, int index)
{
	struct hwmon_device *hwdev = to_hwmon_device(dev);
	struct hwmon_thermal_data *tzdata;

	list_for_each_entry(tzdata, &hwdev->tzdata, node) {
		if (tzdata->index == index) {
			thermal_zone_device_update(tzdata->tzd,
						   THERMAL_EVENT_UNSPECIFIED);
		}
	}
}

#else
static int hwmon_thermal_register_sensors(struct device *dev)
{
	return 0;
}

static void hwmon_thermal_notify(struct device *dev, int index) { }

#endif /* IS_REACHABLE(CONFIG_THERMAL) && ... */

static int hwmon_attr_base(enum hwmon_sensor_types type)
{
	if (type == hwmon_in || type == hwmon_intrusion)
		return 0;
	return 1;
}

/* sysfs attribute management */

static ssize_t hwmon_attr_show(struct device *dev,
			       struct device_attribute *devattr, char *buf)
{
	struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
	long val;
	int ret;

	ret = hattr->ops->read(dev, hattr->type, hattr->attr, hattr->index,
			       &val);
	if (ret < 0)
		return ret;

	trace_hwmon_attr_show(hattr->index + hwmon_attr_base(hattr->type),
			      hattr->name, val);

	return sprintf(buf, "%ld\n", val);
}

static ssize_t hwmon_attr_show_string(struct device *dev,
				      struct device_attribute *devattr,
				      char *buf)
{
	struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
	enum hwmon_sensor_types type = hattr->type;
	const char *s;
	int ret;

	ret = hattr->ops->read_string(dev, hattr->type, hattr->attr,
				      hattr->index, &s);
	if (ret < 0)
		return ret;

	trace_hwmon_attr_show_string(hattr->index + hwmon_attr_base(type),
				     hattr->name, s);

	return sprintf(buf, "%s\n", s);
}

static ssize_t hwmon_attr_store(struct device *dev,
				struct device_attribute *devattr,
				const char *buf, size_t count)
{
	struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
	long val;
	int ret;

	ret = kstrtol(buf, 10, &val);
	if (ret < 0)
		return ret;

	ret = hattr->ops->write(dev, hattr->type, hattr->attr, hattr->index,
				val);
	if (ret < 0)
		return ret;

	trace_hwmon_attr_store(hattr->index + hwmon_attr_base(hattr->type),
			       hattr->name, val);

	return count;
}

static bool is_string_attr(enum hwmon_sensor_types type, u32 attr)
{
	return (type == hwmon_temp && attr == hwmon_temp_label) ||
	       (type == hwmon_in && attr == hwmon_in_label) ||
	       (type == hwmon_curr && attr == hwmon_curr_label) ||
	       (type == hwmon_power && attr == hwmon_power_label) ||
	       (type == hwmon_energy && attr == hwmon_energy_label) ||
	       (type == hwmon_humidity && attr == hwmon_humidity_label) ||
	       (type == hwmon_fan && attr == hwmon_fan_label);
}

static struct attribute *hwmon_genattr(const void *drvdata,
				       enum hwmon_sensor_types type,
				       u32 attr,
				       int index,
				       const char *template,
				       const struct hwmon_ops *ops)
{
	struct hwmon_device_attribute *hattr;
	struct device_attribute *dattr;
	struct attribute *a;
	umode_t mode;
	const char *name;
	bool is_string = is_string_attr(type, attr);

	/* The attribute is invisible if there is no template string */
	if (!template)
		return ERR_PTR(-ENOENT);

	mode = ops->is_visible(drvdata, type, attr, index);
	if (!mode)
		return ERR_PTR(-ENOENT);

	if ((mode & 0444) && ((is_string && !ops->read_string) ||
				 (!is_string && !ops->read)))
		return ERR_PTR(-EINVAL);
	if ((mode & 0222) && !ops->write)
		return ERR_PTR(-EINVAL);

	hattr = kzalloc(sizeof(*hattr), GFP_KERNEL);
	if (!hattr)
		return ERR_PTR(-ENOMEM);

	if (type == hwmon_chip) {
		name = template;
	} else {
		scnprintf(hattr->name, sizeof(hattr->name), template,
			  index + hwmon_attr_base(type));
		name = hattr->name;
	}

	hattr->type = type;
	hattr->attr = attr;
	hattr->index = index;
	hattr->ops = ops;

	dattr = &hattr->dev_attr;
	dattr->show = is_string ? hwmon_attr_show_string : hwmon_attr_show;
	dattr->store = hwmon_attr_store;

	a = &dattr->attr;
	sysfs_attr_init(a);
	a->name = name;
	a->mode = mode;

	return a;
}

/*
 * Chip attributes are not attribute templates but actual sysfs attributes.
 * See hwmon_genattr() for special handling.
 */
static const char * const hwmon_chip_attrs[] = {
	[hwmon_chip_temp_reset_history] = "temp_reset_history",
	[hwmon_chip_in_reset_history] = "in_reset_history",
	[hwmon_chip_curr_reset_history] = "curr_reset_history",
	[hwmon_chip_power_reset_history] = "power_reset_history",
	[hwmon_chip_update_interval] = "update_interval",
	[hwmon_chip_alarms] = "alarms",
	[hwmon_chip_samples] = "samples",
	[hwmon_chip_curr_samples] = "curr_samples",
	[hwmon_chip_in_samples] = "in_samples",
	[hwmon_chip_power_samples] = "power_samples",
	[hwmon_chip_temp_samples] = "temp_samples",
};

static const char * const hwmon_temp_attr_templates[] = {
	[hwmon_temp_enable] = "temp%d_enable",
	[hwmon_temp_input] = "temp%d_input",
	[hwmon_temp_type] = "temp%d_type",
	[hwmon_temp_lcrit] = "temp%d_lcrit",
	[hwmon_temp_lcrit_hyst] = "temp%d_lcrit_hyst",
	[hwmon_temp_min] = "temp%d_min",
	[hwmon_temp_min_hyst] = "temp%d_min_hyst",
	[hwmon_temp_max] = "temp%d_max",
	[hwmon_temp_max_hyst] = "temp%d_max_hyst",
	[hwmon_temp_crit] = "temp%d_crit",
	[hwmon_temp_crit_hyst] = "temp%d_crit_hyst",
	[hwmon_temp_emergency] = "temp%d_emergency",
	[hwmon_temp_emergency_hyst] = "temp%d_emergency_hyst",
	[hwmon_temp_alarm] = "temp%d_alarm",
	[hwmon_temp_lcrit_alarm] = "temp%d_lcrit_alarm",
	[hwmon_temp_min_alarm] = "temp%d_min_alarm",
	[hwmon_temp_max_alarm] = "temp%d_max_alarm",
	[hwmon_temp_crit_alarm] = "temp%d_crit_alarm",
	[hwmon_temp_emergency_alarm] = "temp%d_emergency_alarm",
	[hwmon_temp_fault] = "temp%d_fault",
	[hwmon_temp_offset] = "temp%d_offset",
	[hwmon_temp_label] = "temp%d_label",
	[hwmon_temp_lowest] = "temp%d_lowest",
	[hwmon_temp_highest] = "temp%d_highest",
	[hwmon_temp_reset_history] = "temp%d_reset_history",
	[hwmon_temp_rated_min] = "temp%d_rated_min",
	[hwmon_temp_rated_max] = "temp%d_rated_max",
};

static const char * const hwmon_in_attr_templates[] = {
	[hwmon_in_enable] = "in%d_enable",
	[hwmon_in_input] = "in%d_input",
	[hwmon_in_min] = "in%d_min",
	[hwmon_in_max] = "in%d_max",
	[hwmon_in_lcrit] = "in%d_lcrit",
	[hwmon_in_crit] = "in%d_crit",
	[hwmon_in_average] = "in%d_average",
	[hwmon_in_lowest] = "in%d_lowest",
	[hwmon_in_highest] = "in%d_highest",
	[hwmon_in_reset_history] = "in%d_reset_history",
	[hwmon_in_label] = "in%d_label",
	[hwmon_in_alarm] = "in%d_alarm",
	[hwmon_in_min_alarm] = "in%d_min_alarm",
	[hwmon_in_max_alarm] = "in%d_max_alarm",
	[hwmon_in_lcrit_alarm] = "in%d_lcrit_alarm",
	[hwmon_in_crit_alarm] = "in%d_crit_alarm",
	[hwmon_in_rated_min] = "in%d_rated_min",
	[hwmon_in_rated_max] = "in%d_rated_max",
};

static const char * const hwmon_curr_attr_templates[] = {
	[hwmon_curr_enable] = "curr%d_enable",
	[hwmon_curr_input] = "curr%d_input",
	[hwmon_curr_min] = "curr%d_min",
	[hwmon_curr_max] = "curr%d_max",
	[hwmon_curr_lcrit] = "curr%d_lcrit",
	[hwmon_curr_crit] = "curr%d_crit",
	[hwmon_curr_average] = "curr%d_average",
	[hwmon_curr_lowest] = "curr%d_lowest",
	[hwmon_curr_highest] = "curr%d_highest",
	[hwmon_curr_reset_history] = "curr%d_reset_history",
	[hwmon_curr_label] = "curr%d_label",
	[hwmon_curr_alarm] = "curr%d_alarm",
	[hwmon_curr_min_alarm] = "curr%d_min_alarm",
	[hwmon_curr_max_alarm] = "curr%d_max_alarm",
	[hwmon_curr_lcrit_alarm] = "curr%d_lcrit_alarm",
	[hwmon_curr_crit_alarm] = "curr%d_crit_alarm",
	[hwmon_curr_rated_min] = "curr%d_rated_min",
	[hwmon_curr_rated_max] = "curr%d_rated_max",
};

static const char * const hwmon_power_attr_templates[] = {
	[hwmon_power_enable] = "power%d_enable",
	[hwmon_power_average] = "power%d_average",
	[hwmon_power_average_interval] = "power%d_average_interval",
	[hwmon_power_average_interval_max] = "power%d_interval_max",
	[hwmon_power_average_interval_min] = "power%d_interval_min",
	[hwmon_power_average_highest] = "power%d_average_highest",
	[hwmon_power_average_lowest] = "power%d_average_lowest",
	[hwmon_power_average_max] = "power%d_average_max",
	[hwmon_power_average_min] = "power%d_average_min",
	[hwmon_power_input] = "power%d_input",
	[hwmon_power_input_highest] = "power%d_input_highest",
	[hwmon_power_input_lowest] = "power%d_input_lowest",
	[hwmon_power_reset_history] = "power%d_reset_history",
	[hwmon_power_accuracy] = "power%d_accuracy",
	[hwmon_power_cap] = "power%d_cap",
	[hwmon_power_cap_hyst] = "power%d_cap_hyst",
	[hwmon_power_cap_max] = "power%d_cap_max",
	[hwmon_power_cap_min] = "power%d_cap_min",
	[hwmon_power_min] = "power%d_min",
	[hwmon_power_max] = "power%d_max",
	[hwmon_power_lcrit] = "power%d_lcrit",
	[hwmon_power_crit] = "power%d_crit",
	[hwmon_power_label] = "power%d_label",
	[hwmon_power_alarm] = "power%d_alarm",
	[hwmon_power_cap_alarm] = "power%d_cap_alarm",
	[hwmon_power_min_alarm] = "power%d_min_alarm",
	[hwmon_power_max_alarm] = "power%d_max_alarm",
	[hwmon_power_lcrit_alarm] = "power%d_lcrit_alarm",
	[hwmon_power_crit_alarm] = "power%d_crit_alarm",
	[hwmon_power_rated_min] = "power%d_rated_min",
	[hwmon_power_rated_max] = "power%d_rated_max",
};

static const char * const hwmon_energy_attr_templates[] = {
	[hwmon_energy_enable] = "energy%d_enable",
	[hwmon_energy_input] = "energy%d_input",
	[hwmon_energy_label] = "energy%d_label",
};

static const char * const hwmon_humidity_attr_templates[] = {
	[hwmon_humidity_enable] = "humidity%d_enable",
	[hwmon_humidity_input] = "humidity%d_input",
	[hwmon_humidity_label] = "humidity%d_label",
	[hwmon_humidity_min] = "humidity%d_min",
	[hwmon_humidity_min_hyst] = "humidity%d_min_hyst",
	[hwmon_humidity_max] = "humidity%d_max",
	[hwmon_humidity_max_hyst] = "humidity%d_max_hyst",
	[hwmon_humidity_alarm] = "humidity%d_alarm",
	[hwmon_humidity_fault] = "humidity%d_fault",
	[hwmon_humidity_rated_min] = "humidity%d_rated_min",
	[hwmon_humidity_rated_max] = "humidity%d_rated_max",
};

static const char * const hwmon_fan_attr_templates[] = {
	[hwmon_fan_enable] = "fan%d_enable",
	[hwmon_fan_input] = "fan%d_input",
	[hwmon_fan_label] = "fan%d_label",
	[hwmon_fan_min] = "fan%d_min",
	[hwmon_fan_max] = "fan%d_max",
	[hwmon_fan_div] = "fan%d_div",
	[hwmon_fan_pulses] = "fan%d_pulses",
	[hwmon_fan_target] = "fan%d_target",
	[hwmon_fan_alarm] = "fan%d_alarm",
	[hwmon_fan_min_alarm] = "fan%d_min_alarm",
	[hwmon_fan_max_alarm] = "fan%d_max_alarm",
	[hwmon_fan_fault] = "fan%d_fault",
};

static const char * const hwmon_pwm_attr_templates[] = {
	[hwmon_pwm_input] = "pwm%d",
	[hwmon_pwm_enable] = "pwm%d_enable",
	[hwmon_pwm_mode] = "pwm%d_mode",
	[hwmon_pwm_freq] = "pwm%d_freq",
};

static const char * const hwmon_intrusion_attr_templates[] = {
	[hwmon_intrusion_alarm] = "intrusion%d_alarm",
	[hwmon_intrusion_beep]  = "intrusion%d_beep",
};

static const char * const *__templates[] = {
	[hwmon_chip] = hwmon_chip_attrs,
	[hwmon_temp] = hwmon_temp_attr_templates,
	[hwmon_in] = hwmon_in_attr_templates,
	[hwmon_curr] = hwmon_curr_attr_templates,
	[hwmon_power] = hwmon_power_attr_templates,
	[hwmon_energy] = hwmon_energy_attr_templates,
	[hwmon_humidity] = hwmon_humidity_attr_templates,
	[hwmon_fan] = hwmon_fan_attr_templates,
	[hwmon_pwm] = hwmon_pwm_attr_templates,
	[hwmon_intrusion] = hwmon_intrusion_attr_templates,
};

static const int __templates_size[] = {
	[hwmon_chip] = ARRAY_SIZE(hwmon_chip_attrs),
	[hwmon_temp] = ARRAY_SIZE(hwmon_temp_attr_templates),
	[hwmon_in] = ARRAY_SIZE(hwmon_in_attr_templates),
	[hwmon_curr] = ARRAY_SIZE(hwmon_curr_attr_templates),
	[hwmon_power] = ARRAY_SIZE(hwmon_power_attr_templates),
	[hwmon_energy] = ARRAY_SIZE(hwmon_energy_attr_templates),
	[hwmon_humidity] = ARRAY_SIZE(hwmon_humidity_attr_templates),
	[hwmon_fan] = ARRAY_SIZE(hwmon_fan_attr_templates),
	[hwmon_pwm] = ARRAY_SIZE(hwmon_pwm_attr_templates),
	[hwmon_intrusion] = ARRAY_SIZE(hwmon_intrusion_attr_templates),
};

int hwmon_notify_event(struct device *dev, enum hwmon_sensor_types type,
		       u32 attr, int channel)
{
	char sattr[MAX_SYSFS_ATTR_NAME_LENGTH];
	const char * const *templates;
	const char *template;
	int base;

	if (type >= ARRAY_SIZE(__templates))
		return -EINVAL;
	if (attr >= __templates_size[type])
		return -EINVAL;

	templates = __templates[type];
	template = templates[attr];

	base = hwmon_attr_base(type);

	scnprintf(sattr, MAX_SYSFS_ATTR_NAME_LENGTH, template, base + channel);
	sysfs_notify(&dev->kobj, NULL, sattr);
	kobject_uevent(&dev->kobj, KOBJ_CHANGE);

	if (type == hwmon_temp)
		hwmon_thermal_notify(dev, channel);

	return 0;
}
EXPORT_SYMBOL_GPL(hwmon_notify_event);

static int hwmon_num_channel_attrs(const struct hwmon_channel_info *info)
{
	int i, n;

	for (i = n = 0; info->config[i]; i++)
		n += hweight32(info->config[i]);

	return n;
}

static int hwmon_genattrs(const void *drvdata,
			  struct attribute **attrs,
			  const struct hwmon_ops *ops,
			  const struct hwmon_channel_info *info)
{
	const char * const *templates;
	int template_size;
	int i, aindex = 0;

	if (info->type >= ARRAY_SIZE(__templates))
		return -EINVAL;

	templates = __templates[info->type];
	template_size = __templates_size[info->type];

	for (i = 0; info->config[i]; i++) {
		u32 attr_mask = info->config[i];
		u32 attr;

		while (attr_mask) {
			struct attribute *a;

			attr = __ffs(attr_mask);
			attr_mask &= ~BIT(attr);
			if (attr >= template_size)
				return -EINVAL;
			a = hwmon_genattr(drvdata, info->type, attr, i,
					  templates[attr], ops);
			if (IS_ERR(a)) {
				if (PTR_ERR(a) != -ENOENT)
					return PTR_ERR(a);
				continue;
			}
			attrs[aindex++] = a;
		}
	}
	return aindex;
}

static struct attribute **
__hwmon_create_attrs(const void *drvdata, const struct hwmon_chip_info *chip)
{
	int ret, i, aindex = 0, nattrs = 0;
	struct attribute **attrs;

	for (i = 0; chip->info[i]; i++)
		nattrs += hwmon_num_channel_attrs(chip->info[i]);

	if (nattrs == 0)
		return ERR_PTR(-EINVAL);

	attrs = kcalloc(nattrs + 1, sizeof(*attrs), GFP_KERNEL);
	if (!attrs)
		return ERR_PTR(-ENOMEM);

	for (i = 0; chip->info[i]; i++) {
		ret = hwmon_genattrs(drvdata, &attrs[aindex], chip->ops,
				     chip->info[i]);
		if (ret < 0) {
			hwmon_free_attrs(attrs);
			return ERR_PTR(ret);
		}
		aindex += ret;
	}

	return attrs;
}

static struct device *
__hwmon_device_register(struct device *dev, const char *name, void *drvdata,
			const struct hwmon_chip_info *chip,
			const struct attribute_group **groups)
{
	struct hwmon_device *hwdev;
	struct device *hdev;
	int i, err, id;

	/* Complain about invalid characters in hwmon name attribute */
	if (name && (!strlen(name) || strpbrk(name, "-* \t\n")))
		dev_warn(dev,
			 "hwmon: '%s' is not a valid name attribute, please fix\n",
			 name);

	id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL);
	if (id < 0)
		return ERR_PTR(id);

	hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL);
	if (hwdev == NULL) {
		err = -ENOMEM;
		goto ida_remove;
	}

	hdev = &hwdev->dev;

	if (chip) {
		struct attribute **attrs;
		int ngroups = 2; /* terminating NULL plus &hwdev->groups */

		if (groups)
			for (i = 0; groups[i]; i++)
				ngroups++;

		hwdev->groups = kcalloc(ngroups, sizeof(*groups), GFP_KERNEL);
		if (!hwdev->groups) {
			err = -ENOMEM;
			goto free_hwmon;
		}

		attrs = __hwmon_create_attrs(drvdata, chip);
		if (IS_ERR(attrs)) {
			err = PTR_ERR(attrs);
			goto free_hwmon;
		}

		hwdev->group.attrs = attrs;
		ngroups = 0;
		hwdev->groups[ngroups++] = &hwdev->group;

		if (groups) {
			for (i = 0; groups[i]; i++)
				hwdev->groups[ngroups++] = groups[i];
		}

		hdev->groups = hwdev->groups;
	} else {
		hdev->groups = groups;
	}

	hwdev->name = name;
	hdev->class = &hwmon_class;
	hdev->parent = dev;
	hdev->of_node = dev ? dev->of_node : NULL;
	hwdev->chip = chip;
	dev_set_drvdata(hdev, drvdata);
	dev_set_name(hdev, HWMON_ID_FORMAT, id);
	err = device_register(hdev);
	if (err) {
		put_device(hdev);
		goto ida_remove;
	}

	INIT_LIST_HEAD(&hwdev->tzdata);

	if (dev && dev->of_node && chip && chip->ops->read &&
	    chip->info[0]->type == hwmon_chip &&
	    (chip->info[0]->config[0] & HWMON_C_REGISTER_TZ)) {
		err = hwmon_thermal_register_sensors(hdev);
		if (err) {
			device_unregister(hdev);
			/*
			 * Don't worry about hwdev; hwmon_dev_release(), called
			 * from device_unregister(), will free it.
			 */
			goto ida_remove;
		}
	}

	return hdev;

free_hwmon:
	hwmon_dev_release(hdev);
ida_remove:
	ida_simple_remove(&hwmon_ida, id);
	return ERR_PTR(err);
}

/**
 * hwmon_device_register_with_groups - register w/ hwmon
 * @dev: the parent device
 * @name: hwmon name attribute
 * @drvdata: driver data to attach to created device
 * @groups: List of attribute groups to create
 *
 * hwmon_device_unregister() must be called when the device is no
 * longer needed.
 *
 * Returns the pointer to the new device.
 */
struct device *
hwmon_device_register_with_groups(struct device *dev, const char *name,
				  void *drvdata,
				  const struct attribute_group **groups)
{
	if (!name)
		return ERR_PTR(-EINVAL);

	return __hwmon_device_register(dev, name, drvdata, NULL, groups);
}
EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups);

/**
 * hwmon_device_register_with_info - register w/ hwmon
 * @dev: the parent device
 * @name: hwmon name attribute
 * @drvdata: driver data to attach to created device
 * @chip: pointer to hwmon chip information
 * @extra_groups: pointer to list of additional non-standard attribute groups
 *
 * hwmon_device_unregister() must be called when the device is no
 * longer needed.
 *
 * Returns the pointer to the new device.
 */
struct device *
hwmon_device_register_with_info(struct device *dev, const char *name,
				void *drvdata,
				const struct hwmon_chip_info *chip,
				const struct attribute_group **extra_groups)
{
	if (!name)
		return ERR_PTR(-EINVAL);

	if (chip && (!chip->ops || !chip->ops->is_visible || !chip->info))
		return ERR_PTR(-EINVAL);

	if (chip && !dev)
		return ERR_PTR(-EINVAL);

	return __hwmon_device_register(dev, name, drvdata, chip, extra_groups);
}
EXPORT_SYMBOL_GPL(hwmon_device_register_with_info);

/**
 * hwmon_device_register - register w/ hwmon
 * @dev: the device to register
 *
 * hwmon_device_unregister() must be called when the device is no
 * longer needed.
 *
 * Returns the pointer to the new device.
 */
struct device *hwmon_device_register(struct device *dev)
{
	dev_warn(dev,
		 "hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().\n");

	return __hwmon_device_register(dev, NULL, NULL, NULL, NULL);
}
EXPORT_SYMBOL_GPL(hwmon_device_register);

/**
 * hwmon_device_unregister - removes the previously registered class device
 *
 * @dev: the class device to destroy
 */
void hwmon_device_unregister(struct device *dev)
{
	int id;

	if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) {
		device_unregister(dev);
		ida_simple_remove(&hwmon_ida, id);
	} else
		dev_dbg(dev->parent,
			"hwmon_device_unregister() failed: bad class ID!\n");
}
EXPORT_SYMBOL_GPL(hwmon_device_unregister);

static void devm_hwmon_release(struct device *dev, void *res)
{
	struct device *hwdev = *(struct device **)res;

	hwmon_device_unregister(hwdev);
}

/**
 * devm_hwmon_device_register_with_groups - register w/ hwmon
 * @dev: the parent device
 * @name: hwmon name attribute
 * @drvdata: driver data to attach to created device
 * @groups: List of attribute groups to create
 *
 * Returns the pointer to the new device. The new device is automatically
 * unregistered with the parent device.
 */
struct device *
devm_hwmon_device_register_with_groups(struct device *dev, const char *name,
				       void *drvdata,
				       const struct attribute_group **groups)
{
	struct device **ptr, *hwdev;

	if (!dev)
		return ERR_PTR(-EINVAL);

	ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
	if (!ptr)
		return ERR_PTR(-ENOMEM);

	hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups);
	if (IS_ERR(hwdev))
		goto error;

	*ptr = hwdev;
	devres_add(dev, ptr);
	return hwdev;

error:
	devres_free(ptr);
	return hwdev;
}
EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups);

/**
 * devm_hwmon_device_register_with_info - register w/ hwmon
 * @dev:	the parent device
 * @name:	hwmon name attribute
 * @drvdata:	driver data to attach to created device
 * @chip:	pointer to hwmon chip information
 * @groups:	pointer to list of driver specific attribute groups
 *
 * Returns the pointer to the new device. The new device is automatically
 * unregistered with the parent device.
 */
struct device *
devm_hwmon_device_register_with_info(struct device *dev, const char *name,
				     void *drvdata,
				     const struct hwmon_chip_info *chip,
				     const struct attribute_group **groups)
{
	struct device **ptr, *hwdev;

	if (!dev)
		return ERR_PTR(-EINVAL);

	ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
	if (!ptr)
		return ERR_PTR(-ENOMEM);

	hwdev = hwmon_device_register_with_info(dev, name, drvdata, chip,
						groups);
	if (IS_ERR(hwdev))
		goto error;

	*ptr = hwdev;
	devres_add(dev, ptr);

	return hwdev;

error:
	devres_free(ptr);
	return hwdev;
}
EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_info);

static int devm_hwmon_match(struct device *dev, void *res, void *data)
{
	struct device **hwdev = res;

	return *hwdev == data;
}

/**
 * devm_hwmon_device_unregister - removes a previously registered hwmon device
 *
 * @dev: the parent device of the device to unregister
 */
void devm_hwmon_device_unregister(struct device *dev)
{
	WARN_ON(devres_release(dev, devm_hwmon_release, devm_hwmon_match, dev));
}
EXPORT_SYMBOL_GPL(devm_hwmon_device_unregister);

static void __init hwmon_pci_quirks(void)
{
#if defined CONFIG_X86 && defined CONFIG_PCI
	struct pci_dev *sb;
	u16 base;
	u8 enable;

	/* Open access to 0x295-0x296 on MSI MS-7031 */
	sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL);
	if (sb) {
		if (sb->subsystem_vendor == 0x1462 &&	/* MSI */
		    sb->subsystem_device == 0x0031) {	/* MS-7031 */
			pci_read_config_byte(sb, 0x48, &enable);
			pci_read_config_word(sb, 0x64, &base);

			if (base == 0 && !(enable & BIT(2))) {
				dev_info(&sb->dev,
					 "Opening wide generic port at 0x295\n");
				pci_write_config_word(sb, 0x64, 0x295);
				pci_write_config_byte(sb, 0x48,
						      enable | BIT(2));
			}
		}
		pci_dev_put(sb);
	}
#endif
}

static int __init hwmon_init(void)
{
	int err;

	hwmon_pci_quirks();

	err = class_register(&hwmon_class);
	if (err) {
		pr_err("couldn't register hwmon sysfs class\n");
		return err;
	}
	return 0;
}

static void __exit hwmon_exit(void)
{
	class_unregister(&hwmon_class);
}

subsys_initcall(hwmon_init);
module_exit(hwmon_exit);

MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
MODULE_LICENSE("GPL");