aboutsummaryrefslogtreecommitdiff
path: root/drivers/hwmon/lm63.c
blob: 15c05cc83e2c0346fbe71568f183a595f779921f (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
/*
 * lm63.c - driver for the National Semiconductor LM63 temperature sensor
 *          with integrated fan control
 * Copyright (C) 2004-2008  Jean Delvare <khali@linux-fr.org>
 * Based on the lm90 driver.
 *
 * The LM63 is a sensor chip made by National Semiconductor. It measures
 * two temperatures (its own and one external one) and the speed of one
 * fan, those speed it can additionally control. Complete datasheet can be
 * obtained from National's website at:
 *   http://www.national.com/pf/LM/LM63.html
 *
 * The LM63 is basically an LM86 with fan speed monitoring and control
 * capabilities added. It misses some of the LM86 features though:
 *  - No low limit for local temperature.
 *  - No critical limit for local temperature.
 *  - Critical limit for remote temperature can be changed only once. We
 *    will consider that the critical limit is read-only.
 *
 * The datasheet isn't very clear about what the tachometer reading is.
 * I had a explanation from National Semiconductor though. The two lower
 * bits of the read value have to be masked out. The value is still 16 bit
 * in width.
 *
 * 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-sysfs.h>
#include <linux/hwmon.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>
#include <linux/types.h>

/*
 * Addresses to scan
 * Address is fully defined internally and cannot be changed except for
 * LM64 which has one pin dedicated to address selection.
 * LM63 and LM96163 have address 0x4c.
 * LM64 can have address 0x18 or 0x4e.
 */

static const unsigned short normal_i2c[] = { 0x18, 0x4c, 0x4e, I2C_CLIENT_END };

/*
 * The LM63 registers
 */

#define LM63_REG_CONFIG1		0x03
#define LM63_REG_CONVRATE		0x04
#define LM63_REG_CONFIG2		0xBF
#define LM63_REG_CONFIG_FAN		0x4A

#define LM63_REG_TACH_COUNT_MSB		0x47
#define LM63_REG_TACH_COUNT_LSB		0x46
#define LM63_REG_TACH_LIMIT_MSB		0x49
#define LM63_REG_TACH_LIMIT_LSB		0x48

#define LM63_REG_PWM_VALUE		0x4C
#define LM63_REG_PWM_FREQ		0x4D
#define LM63_REG_LUT_TEMP_HYST		0x4F
#define LM63_REG_LUT_TEMP(nr)		(0x50 + 2 * (nr))
#define LM63_REG_LUT_PWM(nr)		(0x51 + 2 * (nr))

#define LM63_REG_LOCAL_TEMP		0x00
#define LM63_REG_LOCAL_HIGH		0x05

#define LM63_REG_REMOTE_TEMP_MSB	0x01
#define LM63_REG_REMOTE_TEMP_LSB	0x10
#define LM63_REG_REMOTE_OFFSET_MSB	0x11
#define LM63_REG_REMOTE_OFFSET_LSB	0x12
#define LM63_REG_REMOTE_HIGH_MSB	0x07
#define LM63_REG_REMOTE_HIGH_LSB	0x13
#define LM63_REG_REMOTE_LOW_MSB		0x08
#define LM63_REG_REMOTE_LOW_LSB		0x14
#define LM63_REG_REMOTE_TCRIT		0x19
#define LM63_REG_REMOTE_TCRIT_HYST	0x21

#define LM63_REG_ALERT_STATUS		0x02
#define LM63_REG_ALERT_MASK		0x16

#define LM63_REG_MAN_ID			0xFE
#define LM63_REG_CHIP_ID		0xFF

#define LM96163_REG_TRUTHERM		0x30
#define LM96163_REG_REMOTE_TEMP_U_MSB	0x31
#define LM96163_REG_REMOTE_TEMP_U_LSB	0x32
#define LM96163_REG_CONFIG_ENHANCED	0x45

#define LM63_MAX_CONVRATE		9

#define LM63_MAX_CONVRATE_HZ		32
#define LM96163_MAX_CONVRATE_HZ		26

/*
 * Conversions and various macros
 * For tachometer counts, the LM63 uses 16-bit values.
 * For local temperature and high limit, remote critical limit and hysteresis
 * value, it uses signed 8-bit values with LSB = 1 degree Celsius.
 * For remote temperature, low and high limits, it uses signed 11-bit values
 * with LSB = 0.125 degree Celsius, left-justified in 16-bit registers.
 * For LM64 the actual remote diode temperature is 16 degree Celsius higher
 * than the register reading. Remote temperature setpoints have to be
 * adapted accordingly.
 */

#define FAN_FROM_REG(reg)	((reg) == 0xFFFC || (reg) == 0 ? 0 : \
				 5400000 / (reg))
#define FAN_TO_REG(val)		((val) <= 82 ? 0xFFFC : \
				 (5400000 / (val)) & 0xFFFC)
#define TEMP8_FROM_REG(reg)	((reg) * 1000)
#define TEMP8_TO_REG(val)	((val) <= -128000 ? -128 : \
				 (val) >= 127000 ? 127 : \
				 (val) < 0 ? ((val) - 500) / 1000 : \
				 ((val) + 500) / 1000)
#define TEMP8U_TO_REG(val)	((val) <= 0 ? 0 : \
				 (val) >= 255000 ? 255 : \
				 ((val) + 500) / 1000)
#define TEMP11_FROM_REG(reg)	((reg) / 32 * 125)
#define TEMP11_TO_REG(val)	((val) <= -128000 ? 0x8000 : \
				 (val) >= 127875 ? 0x7FE0 : \
				 (val) < 0 ? ((val) - 62) / 125 * 32 : \
				 ((val) + 62) / 125 * 32)
#define TEMP11U_TO_REG(val)	((val) <= 0 ? 0 : \
				 (val) >= 255875 ? 0xFFE0 : \
				 ((val) + 62) / 125 * 32)
#define HYST_TO_REG(val)	((val) <= 0 ? 0 : \
				 (val) >= 127000 ? 127 : \
				 ((val) + 500) / 1000)

#define UPDATE_INTERVAL(max, rate) \
			((1000 << (LM63_MAX_CONVRATE - (rate))) / (max))

/*
 * Functions declaration
 */

static int lm63_probe(struct i2c_client *client,
		      const struct i2c_device_id *id);
static int lm63_remove(struct i2c_client *client);

static struct lm63_data *lm63_update_device(struct device *dev);

static int lm63_detect(struct i2c_client *client, struct i2c_board_info *info);
static void lm63_init_client(struct i2c_client *client);

enum chips { lm63, lm64, lm96163 };

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

static const struct i2c_device_id lm63_id[] = {
	{ "lm63", lm63 },
	{ "lm64", lm64 },
	{ "lm96163", lm96163 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, lm63_id);

static struct i2c_driver lm63_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "lm63",
	},
	.probe		= lm63_probe,
	.remove		= lm63_remove,
	.id_table	= lm63_id,
	.detect		= lm63_detect,
	.address_list	= normal_i2c,
};

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

struct lm63_data {
	struct device *hwmon_dev;
	struct mutex update_lock;
	char valid; /* zero until following fields are valid */
	char lut_valid; /* zero until lut fields are valid */
	unsigned long last_updated; /* in jiffies */
	unsigned long lut_last_updated; /* in jiffies */
	enum chips kind;
	int temp2_offset;

	int update_interval;	/* in milliseconds */
	int max_convrate_hz;
	int lut_size;		/* 8 or 12 */

	/* registers values */
	u8 config, config_fan;
	u16 fan[2];	/* 0: input
			   1: low limit */
	u8 pwm1_freq;
	u8 pwm1[13];	/* 0: current output
			   1-12: lookup table */
	s8 temp8[15];	/* 0: local input
			   1: local high limit
			   2: remote critical limit
			   3-14: lookup table */
	s16 temp11[4];	/* 0: remote input
			   1: remote low limit
			   2: remote high limit
			   3: remote offset */
	u16 temp11u;	/* remote input (unsigned) */
	u8 temp2_crit_hyst;
	u8 lut_temp_hyst;
	u8 alarms;
	bool pwm_highres;
	bool lut_temp_highres;
	bool remote_unsigned; /* true if unsigned remote upper limits */
	bool trutherm;
};

static inline int temp8_from_reg(struct lm63_data *data, int nr)
{
	if (data->remote_unsigned)
		return TEMP8_FROM_REG((u8)data->temp8[nr]);
	return TEMP8_FROM_REG(data->temp8[nr]);
}

static inline int lut_temp_from_reg(struct lm63_data *data, int nr)
{
	return data->temp8[nr] * (data->lut_temp_highres ? 500 : 1000);
}

/*
 * Sysfs callback functions and files
 */

static ssize_t show_fan(struct device *dev, struct device_attribute *devattr,
			char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct lm63_data *data = lm63_update_device(dev);
	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index]));
}

static ssize_t set_fan(struct device *dev, struct device_attribute *dummy,
		       const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct lm63_data *data = i2c_get_clientdata(client);
	unsigned long val;
	int err;

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

	mutex_lock(&data->update_lock);
	data->fan[1] = FAN_TO_REG(val);
	i2c_smbus_write_byte_data(client, LM63_REG_TACH_LIMIT_LSB,
				  data->fan[1] & 0xFF);
	i2c_smbus_write_byte_data(client, LM63_REG_TACH_LIMIT_MSB,
				  data->fan[1] >> 8);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t show_pwm1(struct device *dev, struct device_attribute *devattr,
			 char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct lm63_data *data = lm63_update_device(dev);
	int nr = attr->index;
	int pwm;

	if (data->pwm_highres)
		pwm = data->pwm1[nr];
	else
		pwm = data->pwm1[nr] >= 2 * data->pwm1_freq ?
		       255 : (data->pwm1[nr] * 255 + data->pwm1_freq) /
		       (2 * data->pwm1_freq);

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

static ssize_t set_pwm1(struct device *dev, struct device_attribute *dummy,
			const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct lm63_data *data = i2c_get_clientdata(client);
	unsigned long val;
	int err;

	if (!(data->config_fan & 0x20)) /* register is read-only */
		return -EPERM;

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

	val = SENSORS_LIMIT(val, 0, 255);
	mutex_lock(&data->update_lock);
	data->pwm1[0] = data->pwm_highres ? val :
			(val * data->pwm1_freq * 2 + 127) / 255;
	i2c_smbus_write_byte_data(client, LM63_REG_PWM_VALUE, data->pwm1[0]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t show_pwm1_enable(struct device *dev,
				struct device_attribute *dummy, char *buf)
{
	struct lm63_data *data = lm63_update_device(dev);
	return sprintf(buf, "%d\n", data->config_fan & 0x20 ? 1 : 2);
}

/*
 * There are 8bit registers for both local(temp1) and remote(temp2) sensor.
 * For remote sensor registers temp2_offset has to be considered,
 * for local sensor it must not.
 * So we need separate 8bit accessors for local and remote sensor.
 */
static ssize_t show_local_temp8(struct device *dev,
				struct device_attribute *devattr,
				char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct lm63_data *data = lm63_update_device(dev);
	return sprintf(buf, "%d\n", TEMP8_FROM_REG(data->temp8[attr->index]));
}

static ssize_t show_remote_temp8(struct device *dev,
				 struct device_attribute *devattr,
				 char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct lm63_data *data = lm63_update_device(dev);
	return sprintf(buf, "%d\n", temp8_from_reg(data, attr->index)
		       + data->temp2_offset);
}

static ssize_t show_lut_temp(struct device *dev,
			      struct device_attribute *devattr,
			      char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct lm63_data *data = lm63_update_device(dev);
	return sprintf(buf, "%d\n", lut_temp_from_reg(data, attr->index)
		       + data->temp2_offset);
}

static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr,
			 const char *buf, size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct i2c_client *client = to_i2c_client(dev);
	struct lm63_data *data = i2c_get_clientdata(client);
	int nr = attr->index;
	int reg = nr == 2 ? LM63_REG_REMOTE_TCRIT : LM63_REG_LOCAL_HIGH;
	long val;
	int err;
	int temp;

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

	mutex_lock(&data->update_lock);
	if (nr == 2) {
		if (data->remote_unsigned)
			temp = TEMP8U_TO_REG(val - data->temp2_offset);
		else
			temp = TEMP8_TO_REG(val - data->temp2_offset);
	} else {
		temp = TEMP8_TO_REG(val);
	}
	data->temp8[nr] = temp;
	i2c_smbus_write_byte_data(client, reg, temp);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr,
			   char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct lm63_data *data = lm63_update_device(dev);
	int nr = attr->index;
	int temp;

	if (!nr) {
		/*
		 * Use unsigned temperature unless its value is zero.
		 * If it is zero, use signed temperature.
		 */
		if (data->temp11u)
			temp = TEMP11_FROM_REG(data->temp11u);
		else
			temp = TEMP11_FROM_REG(data->temp11[nr]);
	} else {
		if (data->remote_unsigned && nr == 2)
			temp = TEMP11_FROM_REG((u16)data->temp11[nr]);
		else
			temp = TEMP11_FROM_REG(data->temp11[nr]);
	}
	return sprintf(buf, "%d\n", temp + data->temp2_offset);
}

static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
			  const char *buf, size_t count)
{
	static const u8 reg[6] = {
		LM63_REG_REMOTE_LOW_MSB,
		LM63_REG_REMOTE_LOW_LSB,
		LM63_REG_REMOTE_HIGH_MSB,
		LM63_REG_REMOTE_HIGH_LSB,
		LM63_REG_REMOTE_OFFSET_MSB,
		LM63_REG_REMOTE_OFFSET_LSB,
	};

	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct i2c_client *client = to_i2c_client(dev);
	struct lm63_data *data = i2c_get_clientdata(client);
	long val;
	int err;
	int nr = attr->index;

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

	mutex_lock(&data->update_lock);
	if (data->remote_unsigned && nr == 2)
		data->temp11[nr] = TEMP11U_TO_REG(val - data->temp2_offset);
	else
		data->temp11[nr] = TEMP11_TO_REG(val - data->temp2_offset);

	i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2],
				  data->temp11[nr] >> 8);
	i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2 + 1],
				  data->temp11[nr] & 0xff);
	mutex_unlock(&data->update_lock);
	return count;
}

/*
 * Hysteresis register holds a relative value, while we want to present
 * an absolute to user-space
 */
static ssize_t show_temp2_crit_hyst(struct device *dev,
				    struct device_attribute *dummy, char *buf)
{
	struct lm63_data *data = lm63_update_device(dev);
	return sprintf(buf, "%d\n", temp8_from_reg(data, 2)
		       + data->temp2_offset
		       - TEMP8_FROM_REG(data->temp2_crit_hyst));
}

static ssize_t show_lut_temp_hyst(struct device *dev,
				  struct device_attribute *devattr, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct lm63_data *data = lm63_update_device(dev);

	return sprintf(buf, "%d\n", lut_temp_from_reg(data, attr->index)
		       + data->temp2_offset
		       - TEMP8_FROM_REG(data->lut_temp_hyst));
}

/*
 * And now the other way around, user-space provides an absolute
 * hysteresis value and we have to store a relative one
 */
static ssize_t set_temp2_crit_hyst(struct device *dev,
				   struct device_attribute *dummy,
				   const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct lm63_data *data = i2c_get_clientdata(client);
	long val;
	int err;
	long hyst;

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

	mutex_lock(&data->update_lock);
	hyst = temp8_from_reg(data, 2) + data->temp2_offset - val;
	i2c_smbus_write_byte_data(client, LM63_REG_REMOTE_TCRIT_HYST,
				  HYST_TO_REG(hyst));
	mutex_unlock(&data->update_lock);
	return count;
}

/*
 * Set conversion rate.
 * client->update_lock must be held when calling this function.
 */
static void lm63_set_convrate(struct i2c_client *client, struct lm63_data *data,
			      unsigned int interval)
{
	int i;
	unsigned int update_interval;

	/* Shift calculations to avoid rounding errors */
	interval <<= 6;

	/* find the nearest update rate */
	update_interval = (1 << (LM63_MAX_CONVRATE + 6)) * 1000
	  / data->max_convrate_hz;
	for (i = 0; i < LM63_MAX_CONVRATE; i++, update_interval >>= 1)
		if (interval >= update_interval * 3 / 4)
			break;

	i2c_smbus_write_byte_data(client, LM63_REG_CONVRATE, i);
	data->update_interval = UPDATE_INTERVAL(data->max_convrate_hz, i);
}

static ssize_t show_update_interval(struct device *dev,
				    struct device_attribute *attr, char *buf)
{
	struct lm63_data *data = dev_get_drvdata(dev);

	return sprintf(buf, "%u\n", data->update_interval);
}

static ssize_t set_update_interval(struct device *dev,
				   struct device_attribute *attr,
				   const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct lm63_data *data = i2c_get_clientdata(client);
	unsigned long val;
	int err;

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

	mutex_lock(&data->update_lock);
	lm63_set_convrate(client, data, SENSORS_LIMIT(val, 0, 100000));
	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t show_type(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct lm63_data *data = i2c_get_clientdata(client);

	return sprintf(buf, data->trutherm ? "1\n" : "2\n");
}

static ssize_t set_type(struct device *dev, struct device_attribute *attr,
			const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct lm63_data *data = i2c_get_clientdata(client);
	unsigned long val;
	int ret;
	u8 reg;

	ret = kstrtoul(buf, 10, &val);
	if (ret < 0)
		return ret;
	if (val != 1 && val != 2)
		return -EINVAL;

	mutex_lock(&data->update_lock);
	data->trutherm = val == 1;
	reg = i2c_smbus_read_byte_data(client, LM96163_REG_TRUTHERM) & ~0x02;
	i2c_smbus_write_byte_data(client, LM96163_REG_TRUTHERM,
				  reg | (data->trutherm ? 0x02 : 0x00));
	data->valid = 0;
	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy,
			   char *buf)
{
	struct lm63_data *data = lm63_update_device(dev);
	return sprintf(buf, "%u\n", data->alarms);
}

static ssize_t show_alarm(struct device *dev, struct device_attribute *devattr,
			  char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct lm63_data *data = lm63_update_device(dev);
	int bitnr = attr->index;

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

static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan,
	set_fan, 1);

static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm1, set_pwm1, 0);
static DEVICE_ATTR(pwm1_enable, S_IRUGO, show_pwm1_enable, NULL);
static SENSOR_DEVICE_ATTR(pwm1_auto_point1_pwm, S_IRUGO, show_pwm1, NULL, 1);
static SENSOR_DEVICE_ATTR(pwm1_auto_point1_temp, S_IRUGO,
	show_lut_temp, NULL, 3);
static SENSOR_DEVICE_ATTR(pwm1_auto_point1_temp_hyst, S_IRUGO,
	show_lut_temp_hyst, NULL, 3);
static SENSOR_DEVICE_ATTR(pwm1_auto_point2_pwm, S_IRUGO, show_pwm1, NULL, 2);
static SENSOR_DEVICE_ATTR(pwm1_auto_point2_temp, S_IRUGO,
	show_lut_temp, NULL, 4);
static SENSOR_DEVICE_ATTR(pwm1_auto_point2_temp_hyst, S_IRUGO,
	show_lut_temp_hyst, NULL, 4);
static SENSOR_DEVICE_ATTR(pwm1_auto_point3_pwm, S_IRUGO, show_pwm1, NULL, 3);
static SENSOR_DEVICE_ATTR(pwm1_auto_point3_temp, S_IRUGO,
	show_lut_temp, NULL, 5);
static SENSOR_DEVICE_ATTR(pwm1_auto_point3_temp_hyst, S_IRUGO,
	show_lut_temp_hyst, NULL, 5);
static SENSOR_DEVICE_ATTR(pwm1_auto_point4_pwm, S_IRUGO, show_pwm1, NULL, 4);
static SENSOR_DEVICE_ATTR(pwm1_auto_point4_temp, S_IRUGO,
	show_lut_temp, NULL, 6);
static SENSOR_DEVICE_ATTR(pwm1_auto_point4_temp_hyst, S_IRUGO,
	show_lut_temp_hyst, NULL, 6);
static SENSOR_DEVICE_ATTR(pwm1_auto_point5_pwm, S_IRUGO, show_pwm1, NULL, 5);
static SENSOR_DEVICE_ATTR(pwm1_auto_point5_temp, S_IRUGO,
	show_lut_temp, NULL, 7);
static SENSOR_DEVICE_ATTR(pwm1_auto_point5_temp_hyst, S_IRUGO,
	show_lut_temp_hyst, NULL, 7);
static SENSOR_DEVICE_ATTR(pwm1_auto_point6_pwm, S_IRUGO, show_pwm1, NULL, 6);
static SENSOR_DEVICE_ATTR(pwm1_auto_point6_temp, S_IRUGO,
	show_lut_temp, NULL, 8);
static SENSOR_DEVICE_ATTR(pwm1_auto_point6_temp_hyst, S_IRUGO,
	show_lut_temp_hyst, NULL, 8);
static SENSOR_DEVICE_ATTR(pwm1_auto_point7_pwm, S_IRUGO, show_pwm1, NULL, 7);
static SENSOR_DEVICE_ATTR(pwm1_auto_point7_temp, S_IRUGO,
	show_lut_temp, NULL, 9);
static SENSOR_DEVICE_ATTR(pwm1_auto_point7_temp_hyst, S_IRUGO,
	show_lut_temp_hyst, NULL, 9);
static SENSOR_DEVICE_ATTR(pwm1_auto_point8_pwm, S_IRUGO, show_pwm1, NULL, 8);
static SENSOR_DEVICE_ATTR(pwm1_auto_point8_temp, S_IRUGO,
	show_lut_temp, NULL, 10);
static SENSOR_DEVICE_ATTR(pwm1_auto_point8_temp_hyst, S_IRUGO,
	show_lut_temp_hyst, NULL, 10);
static SENSOR_DEVICE_ATTR(pwm1_auto_point9_pwm, S_IRUGO, show_pwm1, NULL, 9);
static SENSOR_DEVICE_ATTR(pwm1_auto_point9_temp, S_IRUGO,
	show_lut_temp, NULL, 11);
static SENSOR_DEVICE_ATTR(pwm1_auto_point9_temp_hyst, S_IRUGO,
	show_lut_temp_hyst, NULL, 11);
static SENSOR_DEVICE_ATTR(pwm1_auto_point10_pwm, S_IRUGO, show_pwm1, NULL, 10);
static SENSOR_DEVICE_ATTR(pwm1_auto_point10_temp, S_IRUGO,
	show_lut_temp, NULL, 12);
static SENSOR_DEVICE_ATTR(pwm1_auto_point10_temp_hyst, S_IRUGO,
	show_lut_temp_hyst, NULL, 12);
static SENSOR_DEVICE_ATTR(pwm1_auto_point11_pwm, S_IRUGO, show_pwm1, NULL, 11);
static SENSOR_DEVICE_ATTR(pwm1_auto_point11_temp, S_IRUGO,
	show_lut_temp, NULL, 13);
static SENSOR_DEVICE_ATTR(pwm1_auto_point11_temp_hyst, S_IRUGO,
	show_lut_temp_hyst, NULL, 13);
static SENSOR_DEVICE_ATTR(pwm1_auto_point12_pwm, S_IRUGO, show_pwm1, NULL, 12);
static SENSOR_DEVICE_ATTR(pwm1_auto_point12_temp, S_IRUGO,
	show_lut_temp, NULL, 14);
static SENSOR_DEVICE_ATTR(pwm1_auto_point12_temp_hyst, S_IRUGO,
	show_lut_temp_hyst, NULL, 14);

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_local_temp8, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_local_temp8,
	set_temp8, 1);

static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp11, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp11,
	set_temp11, 1);
static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp11,
	set_temp11, 2);
static SENSOR_DEVICE_ATTR(temp2_offset, S_IWUSR | S_IRUGO, show_temp11,
	set_temp11, 3);
static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_remote_temp8,
	set_temp8, 2);
static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp2_crit_hyst,
	set_temp2_crit_hyst);

static DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type, set_type);

/* Individual alarm files */
static SENSOR_DEVICE_ATTR(fan1_min_alarm, S_IRUGO, show_alarm, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
/* Raw alarm file for compatibility */
static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);

static DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR, show_update_interval,
		   set_update_interval);

static struct attribute *lm63_attributes[] = {
	&sensor_dev_attr_pwm1.dev_attr.attr,
	&dev_attr_pwm1_enable.attr,
	&sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point1_temp.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point1_temp_hyst.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point2_temp.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point2_temp_hyst.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point3_temp.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point3_temp_hyst.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point4_pwm.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point4_temp.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point4_temp_hyst.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point5_pwm.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point5_temp.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point5_temp_hyst.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point6_pwm.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point6_temp.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point6_temp_hyst.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point7_pwm.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point7_temp.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point7_temp_hyst.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point8_pwm.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point8_temp.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point8_temp_hyst.dev_attr.attr,

	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&sensor_dev_attr_temp2_min.dev_attr.attr,
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp2_max.dev_attr.attr,
	&sensor_dev_attr_temp2_offset.dev_attr.attr,
	&sensor_dev_attr_temp2_crit.dev_attr.attr,
	&dev_attr_temp2_crit_hyst.attr,

	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_fault.dev_attr.attr,
	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	&dev_attr_alarms.attr,
	&dev_attr_update_interval.attr,
	NULL
};

static struct attribute *lm63_attributes_extra_lut[] = {
	&sensor_dev_attr_pwm1_auto_point9_pwm.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point9_temp.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point9_temp_hyst.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point10_pwm.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point10_temp.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point10_temp_hyst.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point11_pwm.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point11_temp.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point11_temp_hyst.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point12_pwm.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point12_temp.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point12_temp_hyst.dev_attr.attr,
	NULL
};

static const struct attribute_group lm63_group_extra_lut = {
	.attrs = lm63_attributes_extra_lut,
};

/*
 * On LM63, temp2_crit can be set only once, which should be job
 * of the bootloader.
 * On LM64, temp2_crit can always be set.
 * On LM96163, temp2_crit can be set if bit 1 of the configuration
 * register is true.
 */
static umode_t lm63_attribute_mode(struct kobject *kobj,
				   struct attribute *attr, int index)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct i2c_client *client = to_i2c_client(dev);
	struct lm63_data *data = i2c_get_clientdata(client);

	if (attr == &sensor_dev_attr_temp2_crit.dev_attr.attr
	    && (data->kind == lm64 ||
		(data->kind == lm96163 && (data->config & 0x02))))
		return attr->mode | S_IWUSR;

	return attr->mode;
}

static const struct attribute_group lm63_group = {
	.is_visible = lm63_attribute_mode,
	.attrs = lm63_attributes,
};

static struct attribute *lm63_attributes_fan1[] = {
	&sensor_dev_attr_fan1_input.dev_attr.attr,
	&sensor_dev_attr_fan1_min.dev_attr.attr,

	&sensor_dev_attr_fan1_min_alarm.dev_attr.attr,
	NULL
};

static const struct attribute_group lm63_group_fan1 = {
	.attrs = lm63_attributes_fan1,
};

/*
 * Real code
 */

/* Return 0 if detection is successful, -ENODEV otherwise */
static int lm63_detect(struct i2c_client *new_client,
		       struct i2c_board_info *info)
{
	struct i2c_adapter *adapter = new_client->adapter;
	u8 man_id, chip_id, reg_config1, reg_config2;
	u8 reg_alert_status, reg_alert_mask;
	int address = new_client->addr;

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

	man_id = i2c_smbus_read_byte_data(new_client, LM63_REG_MAN_ID);
	chip_id = i2c_smbus_read_byte_data(new_client, LM63_REG_CHIP_ID);

	reg_config1 = i2c_smbus_read_byte_data(new_client,
		      LM63_REG_CONFIG1);
	reg_config2 = i2c_smbus_read_byte_data(new_client,
		      LM63_REG_CONFIG2);
	reg_alert_status = i2c_smbus_read_byte_data(new_client,
			   LM63_REG_ALERT_STATUS);
	reg_alert_mask = i2c_smbus_read_byte_data(new_client,
			 LM63_REG_ALERT_MASK);

	if (man_id != 0x01 /* National Semiconductor */
	 || (reg_config1 & 0x18) != 0x00
	 || (reg_config2 & 0xF8) != 0x00
	 || (reg_alert_status & 0x20) != 0x00
	 || (reg_alert_mask & 0xA4) != 0xA4) {
		dev_dbg(&adapter->dev,
			"Unsupported chip (man_id=0x%02X, chip_id=0x%02X)\n",
			man_id, chip_id);
		return -ENODEV;
	}

	if (chip_id == 0x41 && address == 0x4c)
		strlcpy(info->type, "lm63", I2C_NAME_SIZE);
	else if (chip_id == 0x51 && (address == 0x18 || address == 0x4e))
		strlcpy(info->type, "lm64", I2C_NAME_SIZE);
	else if (chip_id == 0x49 && address == 0x4c)
		strlcpy(info->type, "lm96163", I2C_NAME_SIZE);
	else
		return -ENODEV;

	return 0;
}

static int lm63_probe(struct i2c_client *new_client,
		      const struct i2c_device_id *id)
{
	struct lm63_data *data;
	int err;

	data = kzalloc(sizeof(struct lm63_data), GFP_KERNEL);
	if (!data) {
		err = -ENOMEM;
		goto exit;
	}

	i2c_set_clientdata(new_client, data);
	data->valid = 0;
	mutex_init(&data->update_lock);

	/* Set the device type */
	data->kind = id->driver_data;
	if (data->kind == lm64)
		data->temp2_offset = 16000;

	/* Initialize chip */
	lm63_init_client(new_client);

	/* Register sysfs hooks */
	err = sysfs_create_group(&new_client->dev.kobj, &lm63_group);
	if (err)
		goto exit_free;
	if (data->config & 0x04) { /* tachometer enabled */
		err = sysfs_create_group(&new_client->dev.kobj,
					 &lm63_group_fan1);
		if (err)
			goto exit_remove_files;
	}
	if (data->kind == lm96163) {
		err = device_create_file(&new_client->dev,
					 &dev_attr_temp2_type);
		if (err)
			goto exit_remove_files;

		err = sysfs_create_group(&new_client->dev.kobj,
					 &lm63_group_extra_lut);
		if (err)
			goto exit_remove_files;
	}

	data->hwmon_dev = hwmon_device_register(&new_client->dev);
	if (IS_ERR(data->hwmon_dev)) {
		err = PTR_ERR(data->hwmon_dev);
		goto exit_remove_files;
	}

	return 0;

exit_remove_files:
	sysfs_remove_group(&new_client->dev.kobj, &lm63_group);
	sysfs_remove_group(&new_client->dev.kobj, &lm63_group_fan1);
	if (data->kind == lm96163) {
		device_remove_file(&new_client->dev, &dev_attr_temp2_type);
		sysfs_remove_group(&new_client->dev.kobj,
				   &lm63_group_extra_lut);
	}
exit_free:
	kfree(data);
exit:
	return err;
}

/*
 * Ideally we shouldn't have to initialize anything, since the BIOS
 * should have taken care of everything
 */
static void lm63_init_client(struct i2c_client *client)
{
	struct lm63_data *data = i2c_get_clientdata(client);
	u8 convrate;

	data->config = i2c_smbus_read_byte_data(client, LM63_REG_CONFIG1);
	data->config_fan = i2c_smbus_read_byte_data(client,
						    LM63_REG_CONFIG_FAN);

	/* Start converting if needed */
	if (data->config & 0x40) { /* standby */
		dev_dbg(&client->dev, "Switching to operational mode\n");
		data->config &= 0xA7;
		i2c_smbus_write_byte_data(client, LM63_REG_CONFIG1,
					  data->config);
	}
	/* Tachometer is always enabled on LM64 */
	if (data->kind == lm64)
		data->config |= 0x04;

	/* We may need pwm1_freq before ever updating the client data */
	data->pwm1_freq = i2c_smbus_read_byte_data(client, LM63_REG_PWM_FREQ);
	if (data->pwm1_freq == 0)
		data->pwm1_freq = 1;

	switch (data->kind) {
	case lm63:
	case lm64:
		data->max_convrate_hz = LM63_MAX_CONVRATE_HZ;
		data->lut_size = 8;
		break;
	case lm96163:
		data->max_convrate_hz = LM96163_MAX_CONVRATE_HZ;
		data->lut_size = 12;
		data->trutherm
		  = i2c_smbus_read_byte_data(client,
					     LM96163_REG_TRUTHERM) & 0x02;
		break;
	}
	convrate = i2c_smbus_read_byte_data(client, LM63_REG_CONVRATE);
	if (unlikely(convrate > LM63_MAX_CONVRATE))
		convrate = LM63_MAX_CONVRATE;
	data->update_interval = UPDATE_INTERVAL(data->max_convrate_hz,
						convrate);

	/*
	 * For LM96163, check if high resolution PWM
	 * and unsigned temperature format is enabled.
	 */
	if (data->kind == lm96163) {
		u8 config_enhanced
		  = i2c_smbus_read_byte_data(client,
					     LM96163_REG_CONFIG_ENHANCED);
		if (config_enhanced & 0x20)
			data->lut_temp_highres = true;
		if ((config_enhanced & 0x10)
		    && !(data->config_fan & 0x08) && data->pwm1_freq == 8)
			data->pwm_highres = true;
		if (config_enhanced & 0x08)
			data->remote_unsigned = true;
	}

	/* Show some debug info about the LM63 configuration */
	if (data->kind == lm63)
		dev_dbg(&client->dev, "Alert/tach pin configured for %s\n",
			(data->config & 0x04) ? "tachometer input" :
			"alert output");
	dev_dbg(&client->dev, "PWM clock %s kHz, output frequency %u Hz\n",
		(data->config_fan & 0x08) ? "1.4" : "360",
		((data->config_fan & 0x08) ? 700 : 180000) / data->pwm1_freq);
	dev_dbg(&client->dev, "PWM output active %s, %s mode\n",
		(data->config_fan & 0x10) ? "low" : "high",
		(data->config_fan & 0x20) ? "manual" : "auto");
}

static int lm63_remove(struct i2c_client *client)
{
	struct lm63_data *data = i2c_get_clientdata(client);

	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&client->dev.kobj, &lm63_group);
	sysfs_remove_group(&client->dev.kobj, &lm63_group_fan1);
	if (data->kind == lm96163) {
		device_remove_file(&client->dev, &dev_attr_temp2_type);
		sysfs_remove_group(&client->dev.kobj, &lm63_group_extra_lut);
	}

	kfree(data);
	return 0;
}

static struct lm63_data *lm63_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct lm63_data *data = i2c_get_clientdata(client);
	unsigned long next_update;
	int i;

	mutex_lock(&data->update_lock);

	next_update = data->last_updated
	  + msecs_to_jiffies(data->update_interval) + 1;

	if (time_after(jiffies, next_update) || !data->valid) {
		if (data->config & 0x04) { /* tachometer enabled  */
			/* order matters for fan1_input */
			data->fan[0] = i2c_smbus_read_byte_data(client,
				       LM63_REG_TACH_COUNT_LSB) & 0xFC;
			data->fan[0] |= i2c_smbus_read_byte_data(client,
					LM63_REG_TACH_COUNT_MSB) << 8;
			data->fan[1] = (i2c_smbus_read_byte_data(client,
					LM63_REG_TACH_LIMIT_LSB) & 0xFC)
				     | (i2c_smbus_read_byte_data(client,
					LM63_REG_TACH_LIMIT_MSB) << 8);
		}

		data->pwm1_freq = i2c_smbus_read_byte_data(client,
				  LM63_REG_PWM_FREQ);
		if (data->pwm1_freq == 0)
			data->pwm1_freq = 1;
		data->pwm1[0] = i2c_smbus_read_byte_data(client,
				LM63_REG_PWM_VALUE);

		data->temp8[0] = i2c_smbus_read_byte_data(client,
				 LM63_REG_LOCAL_TEMP);
		data->temp8[1] = i2c_smbus_read_byte_data(client,
				 LM63_REG_LOCAL_HIGH);

		/* order matters for temp2_input */
		data->temp11[0] = i2c_smbus_read_byte_data(client,
				  LM63_REG_REMOTE_TEMP_MSB) << 8;
		data->temp11[0] |= i2c_smbus_read_byte_data(client,
				   LM63_REG_REMOTE_TEMP_LSB);
		data->temp11[1] = (i2c_smbus_read_byte_data(client,
				  LM63_REG_REMOTE_LOW_MSB) << 8)
				| i2c_smbus_read_byte_data(client,
				  LM63_REG_REMOTE_LOW_LSB);
		data->temp11[2] = (i2c_smbus_read_byte_data(client,
				  LM63_REG_REMOTE_HIGH_MSB) << 8)
				| i2c_smbus_read_byte_data(client,
				  LM63_REG_REMOTE_HIGH_LSB);
		data->temp11[3] = (i2c_smbus_read_byte_data(client,
				  LM63_REG_REMOTE_OFFSET_MSB) << 8)
				| i2c_smbus_read_byte_data(client,
				  LM63_REG_REMOTE_OFFSET_LSB);

		if (data->kind == lm96163)
			data->temp11u = (i2c_smbus_read_byte_data(client,
					LM96163_REG_REMOTE_TEMP_U_MSB) << 8)
				      | i2c_smbus_read_byte_data(client,
					LM96163_REG_REMOTE_TEMP_U_LSB);

		data->temp8[2] = i2c_smbus_read_byte_data(client,
				 LM63_REG_REMOTE_TCRIT);
		data->temp2_crit_hyst = i2c_smbus_read_byte_data(client,
					LM63_REG_REMOTE_TCRIT_HYST);

		data->alarms = i2c_smbus_read_byte_data(client,
			       LM63_REG_ALERT_STATUS) & 0x7F;

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

	if (time_after(jiffies, data->lut_last_updated + 5 * HZ) ||
	    !data->lut_valid) {
		for (i = 0; i < data->lut_size; i++) {
			data->pwm1[1 + i] = i2c_smbus_read_byte_data(client,
					    LM63_REG_LUT_PWM(i));
			data->temp8[3 + i] = i2c_smbus_read_byte_data(client,
					     LM63_REG_LUT_TEMP(i));
		}
		data->lut_temp_hyst = i2c_smbus_read_byte_data(client,
				      LM63_REG_LUT_TEMP_HYST);

		data->lut_last_updated = jiffies;
		data->lut_valid = 1;
	}

	mutex_unlock(&data->update_lock);

	return data;
}

module_i2c_driver(lm63_driver);

MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
MODULE_DESCRIPTION("LM63 driver");
MODULE_LICENSE("GPL");