summaryrefslogtreecommitdiffstats
path: root/drivers/hwmon/lm87.c
blob: 81cb898245a107d66ae2dae9f87e9d9d39fdad84 (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
/*
 * lm87.c
 *
 * Copyright (C) 2000       Frodo Looijaard <frodol@dds.nl>
 *                          Philip Edelbrock <phil@netroedge.com>
 *                          Stephen Rousset <stephen.rousset@rocketlogix.com>
 *                          Dan Eaton <dan.eaton@rocketlogix.com>
 * Copyright (C) 2004-2008  Jean Delvare <jdelvare@suse.de>
 *
 * Original port to Linux 2.6 by Jeff Oliver.
 *
 * The LM87 is a sensor chip made by National Semiconductor. It monitors up
 * to 8 voltages (including its own power source), up to three temperatures
 * (its own plus up to two external ones) and up to two fans. The default
 * configuration is 6 voltages, two temperatures and two fans (see below).
 * Voltages are scaled internally with ratios such that the nominal value of
 * each voltage correspond to a register value of 192 (which means a
 * resolution of about 0.5% of the nominal value). Temperature values are
 * reported with a 1 deg resolution and a 3-4 deg accuracy. Complete
 * datasheet can be obtained from National's website at:
 *   http://www.national.com/pf/LM/LM87.html
 *
 * Some functions share pins, so not all functions are available at the same
 * time. Which are depends on the hardware setup. This driver normally
 * assumes that firmware configured the chip correctly. Where this is not
 * the case, platform code must set the I2C client's platform_data to point
 * to a u8 value to be written to the channel register.
 * For reference, here is the list of exclusive functions:
 *  - in0+in5 (default) or temp3
 *  - fan1 (default) or in6
 *  - fan2 (default) or in7
 *  - VID lines (default) or IRQ lines (not handled by this driver)
 *
 * The LM87 additionally features an analog output, supposedly usable to
 * control the speed of a fan. All new chips use pulse width modulation
 * instead. The LM87 is the only hardware monitoring chipset I know of
 * which uses amplitude modulation. Be careful when using this feature.
 *
 * This driver also supports the ADM1024, a sensor chip made by Analog
 * Devices. That chip is fully compatible with the LM87. Complete
 * datasheet can be obtained from Analog's website at:
 *   http://www.analog.com/en/prod/0,2877,ADM1024,00.html
 *
 * 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.
 */

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

/*
 * Addresses to scan
 * LM87 has three possible addresses: 0x2c, 0x2d and 0x2e.
 */

static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };

enum chips { lm87, adm1024 };

/*
 * The LM87 registers
 */

/* nr in 0..5 */
#define LM87_REG_IN(nr)			(0x20 + (nr))
#define LM87_REG_IN_MAX(nr)		(0x2B + (nr) * 2)
#define LM87_REG_IN_MIN(nr)		(0x2C + (nr) * 2)
/* nr in 0..1 */
#define LM87_REG_AIN(nr)		(0x28 + (nr))
#define LM87_REG_AIN_MIN(nr)		(0x1A + (nr))
#define LM87_REG_AIN_MAX(nr)		(0x3B + (nr))

static u8 LM87_REG_TEMP[3] = { 0x27, 0x26, 0x20 };
static u8 LM87_REG_TEMP_HIGH[3] = { 0x39, 0x37, 0x2B };
static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C };

#define LM87_REG_TEMP_HW_INT_LOCK	0x13
#define LM87_REG_TEMP_HW_EXT_LOCK	0x14
#define LM87_REG_TEMP_HW_INT		0x17
#define LM87_REG_TEMP_HW_EXT		0x18

/* nr in 0..1 */
#define LM87_REG_FAN(nr)		(0x28 + (nr))
#define LM87_REG_FAN_MIN(nr)		(0x3B + (nr))
#define LM87_REG_AOUT			0x19

#define LM87_REG_CONFIG			0x40
#define LM87_REG_CHANNEL_MODE		0x16
#define LM87_REG_VID_FAN_DIV		0x47
#define LM87_REG_VID4			0x49

#define LM87_REG_ALARMS1		0x41
#define LM87_REG_ALARMS2		0x42

#define LM87_REG_COMPANY_ID		0x3E
#define LM87_REG_REVISION		0x3F

/*
 * Conversions and various macros
 * The LM87 uses signed 8-bit values for temperatures.
 */

#define IN_FROM_REG(reg, scale)	(((reg) * (scale) + 96) / 192)
#define IN_TO_REG(val, scale)	((val) <= 0 ? 0 : \
				 (val) * 192 >= (scale) * 255 ? 255 : \
				 ((val) * 192 + (scale) / 2) / (scale))

#define TEMP_FROM_REG(reg)	((reg) * 1000)
#define TEMP_TO_REG(val)	((val) <= -127500 ? -128 : \
				 (val) >= 126500 ? 127 : \
				 (((val) < 0 ? (val) - 500 : \
				   (val) + 500) / 1000))

#define FAN_FROM_REG(reg, div)	((reg) == 255 || (reg) == 0 ? 0 : \
				 (1350000 + (reg)*(div) / 2) / ((reg) * (div)))
#define FAN_TO_REG(val, div)	((val) * (div) * 255 <= 1350000 ? 255 : \
				 (1350000 + (val)*(div) / 2) / ((val) * (div)))

#define FAN_DIV_FROM_REG(reg)	(1 << (reg))

/* analog out is 9.80mV/LSB */
#define AOUT_FROM_REG(reg)	(((reg) * 98 + 5) / 10)
#define AOUT_TO_REG(val)	((val) <= 0 ? 0 : \
				 (val) >= 2500 ? 255 : \
				 ((val) * 10 + 49) / 98)

/* nr in 0..1 */
#define CHAN_NO_FAN(nr)		(1 << (nr))
#define CHAN_TEMP3		(1 << 2)
#define CHAN_VCC_5V		(1 << 3)
#define CHAN_NO_VID		(1 << 7)

/*
 * Client data (each client gets its own)
 */

struct lm87_data {
	struct mutex update_lock;
	char valid; /* zero until following fields are valid */
	unsigned long last_updated; /* In jiffies */

	u8 channel;		/* register value */
	u8 config;		/* original register value */

	u8 in[8];		/* register value */
	u8 in_max[8];		/* register value */
	u8 in_min[8];		/* register value */
	u16 in_scale[8];

	s8 temp[3];		/* register value */
	s8 temp_high[3];	/* register value */
	s8 temp_low[3];		/* register value */
	s8 temp_crit_int;	/* min of two register values */
	s8 temp_crit_ext;	/* min of two register values */

	u8 fan[2];		/* register value */
	u8 fan_min[2];		/* register value */
	u8 fan_div[2];		/* register value, shifted right */
	u8 aout;		/* register value */

	u16 alarms;		/* register values, combined */
	u8 vid;			/* register values, combined */
	u8 vrm;

	const struct attribute_group *attr_groups[6];
};

static inline int lm87_read_value(struct i2c_client *client, u8 reg)
{
	return i2c_smbus_read_byte_data(client, reg);
}

static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value)
{
	return i2c_smbus_write_byte_data(client, reg, value);
}

static struct lm87_data *lm87_update_device(struct device *dev)
{
	struct i2c_client *client = dev_get_drvdata(dev);
	struct lm87_data *data = i2c_get_clientdata(client);

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
		int i, j;

		dev_dbg(&client->dev, "Updating data.\n");

		i = (data->channel & CHAN_TEMP3) ? 1 : 0;
		j = (data->channel & CHAN_TEMP3) ? 5 : 6;
		for (; i < j; i++) {
			data->in[i] = lm87_read_value(client,
				      LM87_REG_IN(i));
			data->in_min[i] = lm87_read_value(client,
					  LM87_REG_IN_MIN(i));
			data->in_max[i] = lm87_read_value(client,
					  LM87_REG_IN_MAX(i));
		}

		for (i = 0; i < 2; i++) {
			if (data->channel & CHAN_NO_FAN(i)) {
				data->in[6+i] = lm87_read_value(client,
						LM87_REG_AIN(i));
				data->in_max[6+i] = lm87_read_value(client,
						    LM87_REG_AIN_MAX(i));
				data->in_min[6+i] = lm87_read_value(client,
						    LM87_REG_AIN_MIN(i));

			} else {
				data->fan[i] = lm87_read_value(client,
					       LM87_REG_FAN(i));
				data->fan_min[i] = lm87_read_value(client,
						   LM87_REG_FAN_MIN(i));
			}
		}

		j = (data->channel & CHAN_TEMP3) ? 3 : 2;
		for (i = 0 ; i < j; i++) {
			data->temp[i] = lm87_read_value(client,
					LM87_REG_TEMP[i]);
			data->temp_high[i] = lm87_read_value(client,
					     LM87_REG_TEMP_HIGH[i]);
			data->temp_low[i] = lm87_read_value(client,
					    LM87_REG_TEMP_LOW[i]);
		}

		i = lm87_read_value(client, LM87_REG_TEMP_HW_INT_LOCK);
		j = lm87_read_value(client, LM87_REG_TEMP_HW_INT);
		data->temp_crit_int = min(i, j);

		i = lm87_read_value(client, LM87_REG_TEMP_HW_EXT_LOCK);
		j = lm87_read_value(client, LM87_REG_TEMP_HW_EXT);
		data->temp_crit_ext = min(i, j);

		i = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
		data->fan_div[0] = (i >> 4) & 0x03;
		data->fan_div[1] = (i >> 6) & 0x03;
		data->vid = (i & 0x0F)
			  | (lm87_read_value(client, LM87_REG_VID4) & 0x01)
			     << 4;

		data->alarms = lm87_read_value(client, LM87_REG_ALARMS1)
			     | (lm87_read_value(client, LM87_REG_ALARMS2)
				<< 8);
		data->aout = lm87_read_value(client, LM87_REG_AOUT);

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

	mutex_unlock(&data->update_lock);

	return data;
}

/*
 * Sysfs stuff
 */

static ssize_t show_in_input(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	struct lm87_data *data = lm87_update_device(dev);
	int nr = to_sensor_dev_attr(attr)->index;

	return sprintf(buf, "%u\n", IN_FROM_REG(data->in[nr],
		       data->in_scale[nr]));
}

static ssize_t show_in_min(struct device *dev,
				     struct device_attribute *attr, char *buf)
{
	struct lm87_data *data = lm87_update_device(dev);
	int nr = to_sensor_dev_attr(attr)->index;

	return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[nr],
		       data->in_scale[nr]));
}

static ssize_t show_in_max(struct device *dev,
				     struct device_attribute *attr, char *buf)
{
	struct lm87_data *data = lm87_update_device(dev);
	int nr = to_sensor_dev_attr(attr)->index;

	return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[nr],
		       data->in_scale[nr]));
}

static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
			  const char *buf, size_t count)
{
	struct i2c_client *client = dev_get_drvdata(dev);
	struct lm87_data *data = i2c_get_clientdata(client);
	int nr = to_sensor_dev_attr(attr)->index;
	long val;
	int err;

	err = kstrtol(buf, 10, &val);
	if (err)
		return err;

	mutex_lock(&data->update_lock);
	data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]);
	lm87_write_value(client, nr < 6 ? LM87_REG_IN_MIN(nr) :
			 LM87_REG_AIN_MIN(nr - 6), data->in_min[nr]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t set_in_max(struct device *dev,  struct device_attribute *attr,
			  const char *buf, size_t count)
{
	struct i2c_client *client = dev_get_drvdata(dev);
	struct lm87_data *data = i2c_get_clientdata(client);
	int nr = to_sensor_dev_attr(attr)->index;
	long val;
	int err;

	err = kstrtol(buf, 10, &val);
	if (err)
		return err;

	mutex_lock(&data->update_lock);
	data->in_max[nr] = IN_TO_REG(val, data->in_scale[nr]);
	lm87_write_value(client, nr < 6 ? LM87_REG_IN_MAX(nr) :
			 LM87_REG_AIN_MAX(nr - 6), data->in_max[nr]);
	mutex_unlock(&data->update_lock);
	return count;
}

#define set_in(offset) \
static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
		show_in_input, NULL, offset); \
static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
		show_in_min, set_in_min, offset); \
static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
		show_in_max, set_in_max, offset)
set_in(0);
set_in(1);
set_in(2);
set_in(3);
set_in(4);
set_in(5);
set_in(6);
set_in(7);

static ssize_t show_temp_input(struct device *dev,
			       struct device_attribute *attr, char *buf)
{
	struct lm87_data *data = lm87_update_device(dev);
	int nr = to_sensor_dev_attr(attr)->index;

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

static ssize_t show_temp_low(struct device *dev,
			     struct device_attribute *attr, char *buf)
{
	struct lm87_data *data = lm87_update_device(dev);
	int nr = to_sensor_dev_attr(attr)->index;

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

static ssize_t show_temp_high(struct device *dev,
			      struct device_attribute *attr, char *buf)
{
	struct lm87_data *data = lm87_update_device(dev);
	int nr = to_sensor_dev_attr(attr)->index;

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

static ssize_t set_temp_low(struct device *dev, struct device_attribute *attr,
			    const char *buf, size_t count)
{
	struct i2c_client *client = dev_get_drvdata(dev);
	struct lm87_data *data = i2c_get_clientdata(client);
	int nr = to_sensor_dev_attr(attr)->index;
	long val;
	int err;

	err = kstrtol(buf, 10, &val);
	if (err)
		return err;

	mutex_lock(&data->update_lock);
	data->temp_low[nr] = TEMP_TO_REG(val);
	lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t set_temp_high(struct device *dev, struct device_attribute *attr,
			     const char *buf, size_t count)
{
	struct i2c_client *client = dev_get_drvdata(dev);
	struct lm87_data *data = i2c_get_clientdata(client);
	int nr = to_sensor_dev_attr(attr)->index;
	long val;
	int err;

	err = kstrtol(buf, 10, &val);
	if (err)
		return err;

	mutex_lock(&data->update_lock);
	data->temp_high[nr] = TEMP_TO_REG(val);
	lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]);
	mutex_unlock(&data->update_lock);
	return count;
}

#define set_temp(offset) \
static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
		show_temp_input, NULL, offset - 1); \
static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
		show_temp_high, set_temp_high, offset - 1); \
static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, \
		show_temp_low, set_temp_low, offset - 1)
set_temp(1);
set_temp(2);
set_temp(3);

static ssize_t show_temp_crit_int(struct device *dev,
				  struct device_attribute *attr, char *buf)
{
	struct lm87_data *data = lm87_update_device(dev);
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_int));
}

static ssize_t show_temp_crit_ext(struct device *dev,
				  struct device_attribute *attr, char *buf)
{
	struct lm87_data *data = lm87_update_device(dev);
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_ext));
}

static DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit_int, NULL);
static DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp_crit_ext, NULL);
static DEVICE_ATTR(temp3_crit, S_IRUGO, show_temp_crit_ext, NULL);

static ssize_t show_fan_input(struct device *dev,
			      struct device_attribute *attr, char *buf)
{
	struct lm87_data *data = lm87_update_device(dev);
	int nr = to_sensor_dev_attr(attr)->index;

	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
		       FAN_DIV_FROM_REG(data->fan_div[nr])));
}

static ssize_t show_fan_min(struct device *dev,
			    struct device_attribute *attr, char *buf)
{
	struct lm87_data *data = lm87_update_device(dev);
	int nr = to_sensor_dev_attr(attr)->index;

	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
		       FAN_DIV_FROM_REG(data->fan_div[nr])));
}

static ssize_t show_fan_div(struct device *dev,
			    struct device_attribute *attr, char *buf)
{
	struct lm87_data *data = lm87_update_device(dev);
	int nr = to_sensor_dev_attr(attr)->index;

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

static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
			   const char *buf, size_t count)
{
	struct i2c_client *client = dev_get_drvdata(dev);
	struct lm87_data *data = i2c_get_clientdata(client);
	int nr = to_sensor_dev_attr(attr)->index;
	long val;
	int err;

	err = kstrtol(buf, 10, &val);
	if (err)
		return err;

	mutex_lock(&data->update_lock);
	data->fan_min[nr] = FAN_TO_REG(val,
			    FAN_DIV_FROM_REG(data->fan_div[nr]));
	lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]);
	mutex_unlock(&data->update_lock);
	return count;
}

/*
 * Note: we save and restore the fan minimum here, because its value is
 * determined in part by the fan clock divider.  This follows the principle
 * of least surprise; the user doesn't expect the fan minimum to change just
 * because the divider changed.
 */
static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
			   const char *buf, size_t count)
{
	struct i2c_client *client = dev_get_drvdata(dev);
	struct lm87_data *data = i2c_get_clientdata(client);
	int nr = to_sensor_dev_attr(attr)->index;
	long val;
	int err;
	unsigned long min;
	u8 reg;

	err = kstrtol(buf, 10, &val);
	if (err)
		return err;

	mutex_lock(&data->update_lock);
	min = FAN_FROM_REG(data->fan_min[nr],
			   FAN_DIV_FROM_REG(data->fan_div[nr]));

	switch (val) {
	case 1:
		data->fan_div[nr] = 0;
		break;
	case 2:
		data->fan_div[nr] = 1;
		break;
	case 4:
		data->fan_div[nr] = 2;
		break;
	case 8:
		data->fan_div[nr] = 3;
		break;
	default:
		mutex_unlock(&data->update_lock);
		return -EINVAL;
	}

	reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
	switch (nr) {
	case 0:
	    reg = (reg & 0xCF) | (data->fan_div[0] << 4);
	    break;
	case 1:
	    reg = (reg & 0x3F) | (data->fan_div[1] << 6);
	    break;
	}
	lm87_write_value(client, LM87_REG_VID_FAN_DIV, reg);

	data->fan_min[nr] = FAN_TO_REG(min, val);
	lm87_write_value(client, LM87_REG_FAN_MIN(nr),
			 data->fan_min[nr]);
	mutex_unlock(&data->update_lock);

	return count;
}

#define set_fan(offset) \
static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
		show_fan_input, NULL, offset - 1); \
static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
		show_fan_min, set_fan_min, offset - 1); \
static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
		show_fan_div, set_fan_div, offset - 1)
set_fan(1);
set_fan(2);

static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
			   char *buf)
{
	struct lm87_data *data = lm87_update_device(dev);
	return sprintf(buf, "%d\n", data->alarms);
}
static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);

static ssize_t show_vid(struct device *dev, struct device_attribute *attr,
			char *buf)
{
	struct lm87_data *data = lm87_update_device(dev);
	return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
}
static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);

static ssize_t show_vrm(struct device *dev, struct device_attribute *attr,
			char *buf)
{
	struct lm87_data *data = dev_get_drvdata(dev);
	return sprintf(buf, "%d\n", data->vrm);
}
static ssize_t set_vrm(struct device *dev, struct device_attribute *attr,
		       const char *buf, size_t count)
{
	struct lm87_data *data = dev_get_drvdata(dev);
	unsigned long val;
	int err;

	err = kstrtoul(buf, 10, &val);
	if (err)
		return err;

	if (val > 255)
		return -EINVAL;

	data->vrm = val;
	return count;
}
static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);

static ssize_t show_aout(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct lm87_data *data = lm87_update_device(dev);
	return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
}
static ssize_t set_aout(struct device *dev, struct device_attribute *attr,
			const char *buf, size_t count)
{
	struct i2c_client *client = dev_get_drvdata(dev);
	struct lm87_data *data = i2c_get_clientdata(client);
	long val;
	int err;

	err = kstrtol(buf, 10, &val);
	if (err)
		return err;

	mutex_lock(&data->update_lock);
	data->aout = AOUT_TO_REG(val);
	lm87_write_value(client, LM87_REG_AOUT, data->aout);
	mutex_unlock(&data->update_lock);
	return count;
}
static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout);

static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
	struct lm87_data *data = lm87_update_device(dev);
	int bitnr = to_sensor_dev_attr(attr)->index;
	return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
}
static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 6);
static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 7);
static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5);
static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 5);
static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 14);
static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 15);

/*
 * Real code
 */

static struct attribute *lm87_attributes[] = {
	&sensor_dev_attr_in1_input.dev_attr.attr,
	&sensor_dev_attr_in1_min.dev_attr.attr,
	&sensor_dev_attr_in1_max.dev_attr.attr,
	&sensor_dev_attr_in1_alarm.dev_attr.attr,
	&sensor_dev_attr_in2_input.dev_attr.attr,
	&sensor_dev_attr_in2_min.dev_attr.attr,
	&sensor_dev_attr_in2_max.dev_attr.attr,
	&sensor_dev_attr_in2_alarm.dev_attr.attr,
	&sensor_dev_attr_in3_input.dev_attr.attr,
	&sensor_dev_attr_in3_min.dev_attr.attr,
	&sensor_dev_attr_in3_max.dev_attr.attr,
	&sensor_dev_attr_in3_alarm.dev_attr.attr,
	&sensor_dev_attr_in4_input.dev_attr.attr,
	&sensor_dev_attr_in4_min.dev_attr.attr,
	&sensor_dev_attr_in4_max.dev_attr.attr,
	&sensor_dev_attr_in4_alarm.dev_attr.attr,

	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp1_min.dev_attr.attr,
	&dev_attr_temp1_crit.attr,
	&sensor_dev_attr_temp1_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&sensor_dev_attr_temp2_max.dev_attr.attr,
	&sensor_dev_attr_temp2_min.dev_attr.attr,
	&dev_attr_temp2_crit.attr,
	&sensor_dev_attr_temp2_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_fault.dev_attr.attr,

	&dev_attr_alarms.attr,
	&dev_attr_aout_output.attr,

	NULL
};

static const struct attribute_group lm87_group = {
	.attrs = lm87_attributes,
};

static struct attribute *lm87_attributes_in6[] = {
	&sensor_dev_attr_in6_input.dev_attr.attr,
	&sensor_dev_attr_in6_min.dev_attr.attr,
	&sensor_dev_attr_in6_max.dev_attr.attr,
	&sensor_dev_attr_in6_alarm.dev_attr.attr,
	NULL
};

static const struct attribute_group lm87_group_in6 = {
	.attrs = lm87_attributes_in6,
};

static struct attribute *lm87_attributes_fan1[] = {
	&sensor_dev_attr_fan1_input.dev_attr.attr,
	&sensor_dev_attr_fan1_min.dev_attr.attr,
	&sensor_dev_attr_fan1_div.dev_attr.attr,
	&sensor_dev_attr_fan1_alarm.dev_attr.attr,
	NULL
};

static const struct attribute_group lm87_group_fan1 = {
	.attrs = lm87_attributes_fan1,
};

static struct attribute *lm87_attributes_in7[] = {
	&sensor_dev_attr_in7_input.dev_attr.attr,
	&sensor_dev_attr_in7_min.dev_attr.attr,
	&sensor_dev_attr_in7_max.dev_attr.attr,
	&sensor_dev_attr_in7_alarm.dev_attr.attr,
	NULL
};

static const struct attribute_group lm87_group_in7 = {
	.attrs = lm87_attributes_in7,
};

static struct attribute *lm87_attributes_fan2[] = {
	&sensor_dev_attr_fan2_input.dev_attr.attr,
	&sensor_dev_attr_fan2_min.dev_attr.attr,
	&sensor_dev_attr_fan2_div.dev_attr.attr,
	&sensor_dev_attr_fan2_alarm.dev_attr.attr,
	NULL
};

static const struct attribute_group lm87_group_fan2 = {
	.attrs = lm87_attributes_fan2,
};

static struct attribute *lm87_attributes_temp3[] = {
	&sensor_dev_attr_temp3_input.dev_attr.attr,
	&sensor_dev_attr_temp3_max.dev_attr.attr,
	&sensor_dev_attr_temp3_min.dev_attr.attr,
	&dev_attr_temp3_crit.attr,
	&sensor_dev_attr_temp3_alarm.dev_attr.attr,
	&sensor_dev_attr_temp3_fault.dev_attr.attr,
	NULL
};

static const struct attribute_group lm87_group_temp3 = {
	.attrs = lm87_attributes_temp3,
};

static struct attribute *lm87_attributes_in0_5[] = {
	&sensor_dev_attr_in0_input.dev_attr.attr,
	&sensor_dev_attr_in0_min.dev_attr.attr,
	&sensor_dev_attr_in0_max.dev_attr.attr,
	&sensor_dev_attr_in0_alarm.dev_attr.attr,
	&sensor_dev_attr_in5_input.dev_attr.attr,
	&sensor_dev_attr_in5_min.dev_attr.attr,
	&sensor_dev_attr_in5_max.dev_attr.attr,
	&sensor_dev_attr_in5_alarm.dev_attr.attr,
	NULL
};

static const struct attribute_group lm87_group_in0_5 = {
	.attrs = lm87_attributes_in0_5,
};

static struct attribute *lm87_attributes_vid[] = {
	&dev_attr_cpu0_vid.attr,
	&dev_attr_vrm.attr,
	NULL
};

static const struct attribute_group lm87_group_vid = {
	.attrs = lm87_attributes_vid,
};

/* Return 0 if detection is successful, -ENODEV otherwise */
static int lm87_detect(struct i2c_client *client, struct i2c_board_info *info)
{
	struct i2c_adapter *adapter = client->adapter;
	const char *name;
	u8 cid, rev;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		return -ENODEV;

	if (lm87_read_value(client, LM87_REG_CONFIG) & 0x80)
		return -ENODEV;

	/* Now, we do the remaining detection. */
	cid = lm87_read_value(client, LM87_REG_COMPANY_ID);
	rev = lm87_read_value(client, LM87_REG_REVISION);

	if (cid == 0x02			/* National Semiconductor */
	 && (rev >= 0x01 && rev <= 0x08))
		name = "lm87";
	else if (cid == 0x41		/* Analog Devices */
	      && (rev & 0xf0) == 0x10)
		name = "adm1024";
	else {
		dev_dbg(&adapter->dev, "LM87 detection failed at 0x%02x\n",
			client->addr);
		return -ENODEV;
	}

	strlcpy(info->type, name, I2C_NAME_SIZE);

	return 0;
}

static void lm87_restore_config(void *arg)
{
	struct i2c_client *client = arg;
	struct lm87_data *data = i2c_get_clientdata(client);

	lm87_write_value(client, LM87_REG_CONFIG, data->config);
}

static int lm87_init_client(struct i2c_client *client)
{
	struct lm87_data *data = i2c_get_clientdata(client);
	int rc;

	if (dev_get_platdata(&client->dev)) {
		data->channel = *(u8 *)dev_get_platdata(&client->dev);
		lm87_write_value(client,
				 LM87_REG_CHANNEL_MODE, data->channel);
	} else {
		data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE);
	}
	data->config = lm87_read_value(client, LM87_REG_CONFIG) & 0x6F;

	rc = devm_add_action(&client->dev, lm87_restore_config, client);
	if (rc)
		return rc;

	if (!(data->config & 0x01)) {
		int i;

		/* Limits are left uninitialized after power-up */
		for (i = 1; i < 6; i++) {
			lm87_write_value(client, LM87_REG_IN_MIN(i), 0x00);
			lm87_write_value(client, LM87_REG_IN_MAX(i), 0xFF);
		}
		for (i = 0; i < 2; i++) {
			lm87_write_value(client, LM87_REG_TEMP_HIGH[i], 0x7F);
			lm87_write_value(client, LM87_REG_TEMP_LOW[i], 0x00);
			lm87_write_value(client, LM87_REG_AIN_MIN(i), 0x00);
			lm87_write_value(client, LM87_REG_AIN_MAX(i), 0xFF);
		}
		if (data->channel & CHAN_TEMP3) {
			lm87_write_value(client, LM87_REG_TEMP_HIGH[2], 0x7F);
			lm87_write_value(client, LM87_REG_TEMP_LOW[2], 0x00);
		} else {
			lm87_write_value(client, LM87_REG_IN_MIN(0), 0x00);
			lm87_write_value(client, LM87_REG_IN_MAX(0), 0xFF);
		}
	}

	/* Make sure Start is set and INT#_Clear is clear */
	if ((data->config & 0x09) != 0x01)
		lm87_write_value(client, LM87_REG_CONFIG,
				 (data->config & 0x77) | 0x01);
	return 0;
}

static int lm87_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
	struct lm87_data *data;
	struct device *hwmon_dev;
	int err;
	unsigned int group_tail = 0;

	data = devm_kzalloc(&client->dev, sizeof(struct lm87_data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	i2c_set_clientdata(client, data);
	mutex_init(&data->update_lock);

	/* Initialize the LM87 chip */
	err = lm87_init_client(client);
	if (err)
		return err;

	data->in_scale[0] = 2500;
	data->in_scale[1] = 2700;
	data->in_scale[2] = (data->channel & CHAN_VCC_5V) ? 5000 : 3300;
	data->in_scale[3] = 5000;
	data->in_scale[4] = 12000;
	data->in_scale[5] = 2700;
	data->in_scale[6] = 1875;
	data->in_scale[7] = 1875;

	/*
	 * Construct the list of attributes, the list depends on the
	 * configuration of the chip
	 */
	data->attr_groups[group_tail++] = &lm87_group;
	if (data->channel & CHAN_NO_FAN(0))
		data->attr_groups[group_tail++] = &lm87_group_in6;
	else
		data->attr_groups[group_tail++] = &lm87_group_fan1;

	if (data->channel & CHAN_NO_FAN(1))
		data->attr_groups[group_tail++] = &lm87_group_in7;
	else
		data->attr_groups[group_tail++] = &lm87_group_fan2;

	if (data->channel & CHAN_TEMP3)
		data->attr_groups[group_tail++] = &lm87_group_temp3;
	else
		data->attr_groups[group_tail++] = &lm87_group_in0_5;

	if (!(data->channel & CHAN_NO_VID)) {
		data->vrm = vid_which_vrm();
		data->attr_groups[group_tail++] = &lm87_group_vid;
	}

	hwmon_dev = devm_hwmon_device_register_with_groups(
	    &client->dev, client->name, client, data->attr_groups);
	return PTR_ERR_OR_ZERO(hwmon_dev);
}

/*
 * Driver data (common to all clients)
 */

static const struct i2c_device_id lm87_id[] = {
	{ "lm87", lm87 },
	{ "adm1024", adm1024 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, lm87_id);

static struct i2c_driver lm87_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "lm87",
	},
	.probe		= lm87_probe,
	.id_table	= lm87_id,
	.detect		= lm87_detect,
	.address_list	= normal_i2c,
};

module_i2c_driver(lm87_driver);

MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de> and others");
MODULE_DESCRIPTION("LM87 driver");
MODULE_LICENSE("GPL");