aboutsummaryrefslogtreecommitdiff
path: root/drivers/hwmon/gl520sm.c
blob: a3b56c816e11d3924c98698f6978802c27e6fc29 (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
/*
    gl520sm.c - Part of lm_sensors, Linux kernel modules for hardware
                monitoring
    Copyright (c) 1998, 1999  Frodo Looijaard <frodol@dds.nl>,
                              Kyösti Mälkki <kmalkki@cc.hut.fi>
    Copyright (c) 2005        Maarten Deprez <maartendeprez@users.sourceforge.net>

    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-vid.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>

/* Type of the extra sensor */
static unsigned short extra_sensor_type;
module_param(extra_sensor_type, ushort, 0);
MODULE_PARM_DESC(extra_sensor_type, "Type of extra sensor (0=autodetect, 1=temperature, 2=voltage)");

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

/* Insmod parameters */
I2C_CLIENT_INSMOD_1(gl520sm);

/* Many GL520 constants specified below 
One of the inputs can be configured as either temp or voltage.
That's why _TEMP2 and _IN4 access the same register 
*/

/* The GL520 registers */
#define GL520_REG_CHIP_ID		0x00
#define GL520_REG_REVISION		0x01
#define GL520_REG_CONF			0x03
#define GL520_REG_MASK			0x11

#define GL520_REG_VID_INPUT		0x02

#define GL520_REG_IN0_INPUT		0x15
#define GL520_REG_IN0_LIMIT		0x0c
#define GL520_REG_IN0_MIN		GL520_REG_IN0_LIMIT
#define GL520_REG_IN0_MAX		GL520_REG_IN0_LIMIT

#define GL520_REG_IN1_INPUT		0x14
#define GL520_REG_IN1_LIMIT		0x09
#define GL520_REG_IN1_MIN		GL520_REG_IN1_LIMIT
#define GL520_REG_IN1_MAX		GL520_REG_IN1_LIMIT

#define GL520_REG_IN2_INPUT		0x13
#define GL520_REG_IN2_LIMIT		0x0a
#define GL520_REG_IN2_MIN		GL520_REG_IN2_LIMIT
#define GL520_REG_IN2_MAX		GL520_REG_IN2_LIMIT

#define GL520_REG_IN3_INPUT		0x0d
#define GL520_REG_IN3_LIMIT		0x0b
#define GL520_REG_IN3_MIN		GL520_REG_IN3_LIMIT
#define GL520_REG_IN3_MAX		GL520_REG_IN3_LIMIT

#define GL520_REG_IN4_INPUT		0x0e
#define GL520_REG_IN4_MAX		0x17
#define GL520_REG_IN4_MIN		0x18

#define GL520_REG_TEMP1_INPUT		0x04
#define GL520_REG_TEMP1_MAX		0x05
#define GL520_REG_TEMP1_MAX_HYST	0x06

#define GL520_REG_TEMP2_INPUT		0x0e
#define GL520_REG_TEMP2_MAX		0x17
#define GL520_REG_TEMP2_MAX_HYST	0x18

#define GL520_REG_FAN_INPUT		0x07
#define GL520_REG_FAN_MIN		0x08
#define GL520_REG_FAN_DIV		0x0f
#define GL520_REG_FAN_OFF		GL520_REG_FAN_DIV

#define GL520_REG_ALARMS		0x12
#define GL520_REG_BEEP_MASK		0x10
#define GL520_REG_BEEP_ENABLE		GL520_REG_CONF

/*
 * Function declarations
 */

static int gl520_attach_adapter(struct i2c_adapter *adapter);
static int gl520_detect(struct i2c_adapter *adapter, int address, int kind);
static void gl520_init_client(struct i2c_client *client);
static int gl520_detach_client(struct i2c_client *client);
static int gl520_read_value(struct i2c_client *client, u8 reg);
static int gl520_write_value(struct i2c_client *client, u8 reg, u16 value);
static struct gl520_data *gl520_update_device(struct device *dev);

/* Driver data */
static struct i2c_driver gl520_driver = {
	.driver = {
		.name	= "gl520sm",
	},
	.id		= I2C_DRIVERID_GL520,
	.attach_adapter	= gl520_attach_adapter,
	.detach_client	= gl520_detach_client,
};

/* Client data */
struct gl520_data {
	struct i2c_client client;
	struct device *hwmon_dev;
	struct mutex update_lock;
	char valid;		/* zero until the following fields are valid */
	unsigned long last_updated;	/* in jiffies */

	u8 vid;
	u8 vrm;
	u8 in_input[5];		/* [0] = VVD */
	u8 in_min[5];		/* [0] = VDD */
	u8 in_max[5];		/* [0] = VDD */
	u8 fan_input[2];
	u8 fan_min[2];
	u8 fan_div[2];
	u8 fan_off;
	u8 temp_input[2];
	u8 temp_max[2];
	u8 temp_max_hyst[2];
	u8 alarms;
	u8 beep_enable;
	u8 beep_mask;
	u8 alarm_mask;
	u8 two_temps;
};

/*
 * Sysfs stuff
 */

#define sysfs_r(type, n, item, reg) \
static ssize_t get_##type##item (struct gl520_data *, char *, int); \
static ssize_t get_##type##n##item (struct device *, struct device_attribute *attr, char *); \
static ssize_t get_##type##n##item (struct device *dev, struct device_attribute *attr, char *buf) \
{ \
	struct gl520_data *data = gl520_update_device(dev); \
	return get_##type##item(data, buf, (n)); \
}

#define sysfs_w(type, n, item, reg) \
static ssize_t set_##type##item (struct i2c_client *, struct gl520_data *, const char *, size_t, int, int); \
static ssize_t set_##type##n##item (struct device *, struct device_attribute *attr, const char *, size_t); \
static ssize_t set_##type##n##item (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \
{ \
	struct i2c_client *client = to_i2c_client(dev); \
	struct gl520_data *data = i2c_get_clientdata(client); \
	return set_##type##item(client, data, buf, count, (n), reg); \
}

#define sysfs_rw_n(type, n, item, reg) \
sysfs_r(type, n, item, reg) \
sysfs_w(type, n, item, reg) \
static DEVICE_ATTR(type##n##item, S_IRUGO | S_IWUSR, get_##type##n##item, set_##type##n##item);

#define sysfs_ro_n(type, n, item, reg) \
sysfs_r(type, n, item, reg) \
static DEVICE_ATTR(type##n##item, S_IRUGO, get_##type##n##item, NULL);

#define sysfs_rw(type, item, reg) \
sysfs_r(type, 0, item, reg) \
sysfs_w(type, 0, item, reg) \
static DEVICE_ATTR(type##item, S_IRUGO | S_IWUSR, get_##type##0##item, set_##type##0##item);

#define sysfs_ro(type, item, reg) \
sysfs_r(type, 0, item, reg) \
static DEVICE_ATTR(type##item, S_IRUGO, get_##type##0##item, NULL);


#define sysfs_vid(n) \
sysfs_ro_n(cpu, n, _vid, GL520_REG_VID_INPUT)

#define sysfs_in(n) \
sysfs_ro_n(in, n, _input, GL520_REG_IN##n##INPUT) \
sysfs_rw_n(in, n, _min, GL520_REG_IN##n##_MIN) \
sysfs_rw_n(in, n, _max, GL520_REG_IN##n##_MAX) \

#define sysfs_fan(n) \
sysfs_ro_n(fan, n, _input, GL520_REG_FAN_INPUT) \
sysfs_rw_n(fan, n, _min, GL520_REG_FAN_MIN) \
sysfs_rw_n(fan, n, _div, GL520_REG_FAN_DIV)

#define sysfs_fan_off(n) \
sysfs_rw_n(fan, n, _off, GL520_REG_FAN_OFF) \

#define sysfs_temp(n) \
sysfs_ro_n(temp, n, _input, GL520_REG_TEMP##n##_INPUT) \
sysfs_rw_n(temp, n, _max, GL520_REG_TEMP##n##_MAX) \
sysfs_rw_n(temp, n, _max_hyst, GL520_REG_TEMP##n##_MAX_HYST)

#define sysfs_alarms() \
sysfs_ro(alarms, , GL520_REG_ALARMS) \
sysfs_rw(beep_enable, , GL520_REG_BEEP_ENABLE) \
sysfs_rw(beep_mask, , GL520_REG_BEEP_MASK)


sysfs_vid(0)

sysfs_in(0)
sysfs_in(1)
sysfs_in(2)
sysfs_in(3)
sysfs_in(4)

sysfs_fan(1)
sysfs_fan(2)
sysfs_fan_off(1)

sysfs_temp(1)
sysfs_temp(2)

sysfs_alarms()


static ssize_t get_cpu_vid(struct gl520_data *data, char *buf, int n)
{
	return sprintf(buf, "%u\n", vid_from_reg(data->vid, data->vrm));
}

#define VDD_FROM_REG(val) (((val)*95+2)/4)
#define VDD_TO_REG(val) (SENSORS_LIMIT((((val)*4+47)/95),0,255))

#define IN_FROM_REG(val) ((val)*19)
#define IN_TO_REG(val) (SENSORS_LIMIT((((val)+9)/19),0,255))

static ssize_t get_in_input(struct gl520_data *data, char *buf, int n)
{
	u8 r = data->in_input[n];

	if (n == 0)
		return sprintf(buf, "%d\n", VDD_FROM_REG(r));
	else
		return sprintf(buf, "%d\n", IN_FROM_REG(r));
}

static ssize_t get_in_min(struct gl520_data *data, char *buf, int n)
{
	u8 r = data->in_min[n];

	if (n == 0)
		return sprintf(buf, "%d\n", VDD_FROM_REG(r));
	else
		return sprintf(buf, "%d\n", IN_FROM_REG(r));
}

static ssize_t get_in_max(struct gl520_data *data, char *buf, int n)
{
	u8 r = data->in_max[n];

	if (n == 0)
		return sprintf(buf, "%d\n", VDD_FROM_REG(r));
	else
		return sprintf(buf, "%d\n", IN_FROM_REG(r));
}

static ssize_t set_in_min(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
	long v = simple_strtol(buf, NULL, 10);
	u8 r;

	mutex_lock(&data->update_lock);

	if (n == 0)
		r = VDD_TO_REG(v);
	else
		r = IN_TO_REG(v);

	data->in_min[n] = r;

	if (n < 4)
		gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0xff) | r);
	else
		gl520_write_value(client, reg, r);

	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t set_in_max(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
	long v = simple_strtol(buf, NULL, 10);
	u8 r;

	if (n == 0)
		r = VDD_TO_REG(v);
	else
		r = IN_TO_REG(v);

	mutex_lock(&data->update_lock);

	data->in_max[n] = r;

	if (n < 4)
		gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0xff00) | (r << 8));
	else
		gl520_write_value(client, reg, r);

	mutex_unlock(&data->update_lock);
	return count;
}

#define DIV_FROM_REG(val) (1 << (val))
#define FAN_FROM_REG(val,div) ((val)==0 ? 0 : (480000/((val) << (div))))
#define FAN_TO_REG(val,div) ((val)<=0?0:SENSORS_LIMIT((480000 + ((val) << ((div)-1))) / ((val) << (div)), 1, 255));

static ssize_t get_fan_input(struct gl520_data *data, char *buf, int n)
{
	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_input[n - 1], data->fan_div[n - 1]));
}

static ssize_t get_fan_min(struct gl520_data *data, char *buf, int n)
{
	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[n - 1], data->fan_div[n - 1]));
}

static ssize_t get_fan_div(struct gl520_data *data, char *buf, int n)
{
	return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[n - 1]));
}

static ssize_t get_fan_off(struct gl520_data *data, char *buf, int n)
{
	return sprintf(buf, "%d\n", data->fan_off);
}

static ssize_t set_fan_min(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
	unsigned long v = simple_strtoul(buf, NULL, 10);
	u8 r;

	mutex_lock(&data->update_lock);
	r = FAN_TO_REG(v, data->fan_div[n - 1]);
	data->fan_min[n - 1] = r;

	if (n == 1)
		gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0xff00) | (r << 8));
	else
		gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0xff) | r);

	data->beep_mask = gl520_read_value(client, GL520_REG_BEEP_MASK);
	if (data->fan_min[n - 1] == 0)
		data->alarm_mask &= (n == 1) ? ~0x20 : ~0x40;
	else
		data->alarm_mask |= (n == 1) ? 0x20 : 0x40;
	data->beep_mask &= data->alarm_mask;
	gl520_write_value(client, GL520_REG_BEEP_MASK, data->beep_mask);

	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t set_fan_div(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
	unsigned long v = simple_strtoul(buf, NULL, 10);
	u8 r;

	switch (v) {
	case 1: r = 0; break;
	case 2: r = 1; break;
	case 4: r = 2; break;
	case 8: r = 3; break;
	default:
		dev_err(&client->dev, "fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n", v);
		return -EINVAL;
	}

	mutex_lock(&data->update_lock);
	data->fan_div[n - 1] = r;

	if (n == 1)
		gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0xc0) | (r << 6));
	else
		gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0x30) | (r << 4));

	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t set_fan_off(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
	u8 r = simple_strtoul(buf, NULL, 10)?1:0;

	mutex_lock(&data->update_lock);
	data->fan_off = r;
	gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0x0c) | (r << 2));
	mutex_unlock(&data->update_lock);
	return count;
}

#define TEMP_FROM_REG(val) (((val) - 130) * 1000)
#define TEMP_TO_REG(val) (SENSORS_LIMIT(((((val)<0?(val)-500:(val)+500) / 1000)+130),0,255))

static ssize_t get_temp_input(struct gl520_data *data, char *buf, int n)
{
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_input[n - 1]));
}

static ssize_t get_temp_max(struct gl520_data *data, char *buf, int n)
{
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[n - 1]));
}

static ssize_t get_temp_max_hyst(struct gl520_data *data, char *buf, int n)
{
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max_hyst[n - 1]));
}

static ssize_t set_temp_max(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
	long v = simple_strtol(buf, NULL, 10);

	mutex_lock(&data->update_lock);
	data->temp_max[n - 1] = TEMP_TO_REG(v);
	gl520_write_value(client, reg, data->temp_max[n - 1]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t set_temp_max_hyst(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
	long v = simple_strtol(buf, NULL, 10);

	mutex_lock(&data->update_lock);
	data->temp_max_hyst[n - 1] = TEMP_TO_REG(v);
	gl520_write_value(client, reg, data->temp_max_hyst[n - 1]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t get_alarms(struct gl520_data *data, char *buf, int n)
{
	return sprintf(buf, "%d\n", data->alarms);
}

static ssize_t get_beep_enable(struct gl520_data *data, char *buf, int n)
{
	return sprintf(buf, "%d\n", data->beep_enable);
}

static ssize_t get_beep_mask(struct gl520_data *data, char *buf, int n)
{
	return sprintf(buf, "%d\n", data->beep_mask);
}

static ssize_t set_beep_enable(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
	u8 r = simple_strtoul(buf, NULL, 10)?0:1;

	mutex_lock(&data->update_lock);
	data->beep_enable = !r;
	gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0x04) | (r << 2));
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t set_beep_mask(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
	u8 r = simple_strtoul(buf, NULL, 10);
	
	mutex_lock(&data->update_lock);
	r &= data->alarm_mask;
	data->beep_mask = r;
	gl520_write_value(client, reg, r);
	mutex_unlock(&data->update_lock);
	return count;
}

static struct attribute *gl520_attributes[] = {
	&dev_attr_cpu0_vid.attr,

	&dev_attr_in0_input.attr,
	&dev_attr_in0_min.attr,
	&dev_attr_in0_max.attr,
	&dev_attr_in1_input.attr,
	&dev_attr_in1_min.attr,
	&dev_attr_in1_max.attr,
	&dev_attr_in2_input.attr,
	&dev_attr_in2_min.attr,
	&dev_attr_in2_max.attr,
	&dev_attr_in3_input.attr,
	&dev_attr_in3_min.attr,
	&dev_attr_in3_max.attr,

	&dev_attr_fan1_input.attr,
	&dev_attr_fan1_min.attr,
	&dev_attr_fan1_div.attr,
	&dev_attr_fan1_off.attr,
	&dev_attr_fan2_input.attr,
	&dev_attr_fan2_min.attr,
	&dev_attr_fan2_div.attr,

	&dev_attr_temp1_input.attr,
	&dev_attr_temp1_max.attr,
	&dev_attr_temp1_max_hyst.attr,

	&dev_attr_alarms.attr,
	&dev_attr_beep_enable.attr,
	&dev_attr_beep_mask.attr,
	NULL
};

static const struct attribute_group gl520_group = {
	.attrs = gl520_attributes,
};

static struct attribute *gl520_attributes_opt[] = {
	&dev_attr_in4_input.attr,
	&dev_attr_in4_min.attr,
	&dev_attr_in4_max.attr,

	&dev_attr_temp2_input.attr,
	&dev_attr_temp2_max.attr,
	&dev_attr_temp2_max_hyst.attr,
	NULL
};

static const struct attribute_group gl520_group_opt = {
	.attrs = gl520_attributes_opt,
};


/*
 * Real code
 */

static int gl520_attach_adapter(struct i2c_adapter *adapter)
{
	if (!(adapter->class & I2C_CLASS_HWMON))
		return 0;
	return i2c_probe(adapter, &addr_data, gl520_detect);
}

static int gl520_detect(struct i2c_adapter *adapter, int address, int kind)
{
	struct i2c_client *new_client;
	struct gl520_data *data;
	int err = 0;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
				     I2C_FUNC_SMBUS_WORD_DATA))
		goto exit;

	/* OK. For now, we presume we have a valid client. We now create the
	   client structure, even though we cannot fill it completely yet.
	   But it allows us to access gl520_{read,write}_value. */

	if (!(data = kzalloc(sizeof(struct gl520_data), GFP_KERNEL))) {
		err = -ENOMEM;
		goto exit;
	}

	new_client = &data->client;
	i2c_set_clientdata(new_client, data);
	new_client->addr = address;
	new_client->adapter = adapter;
	new_client->driver = &gl520_driver;
	new_client->flags = 0;

	/* Determine the chip type. */
	if (kind < 0) {
		if ((gl520_read_value(new_client, GL520_REG_CHIP_ID) != 0x20) ||
		    ((gl520_read_value(new_client, GL520_REG_REVISION) & 0x7f) != 0x00) ||
		    ((gl520_read_value(new_client, GL520_REG_CONF) & 0x80) != 0x00)) {
			dev_dbg(&new_client->dev, "Unknown chip type, skipping\n");
			goto exit_free;
		}
	}

	/* Fill in the remaining client fields */
	strlcpy(new_client->name, "gl520sm", I2C_NAME_SIZE);
	data->valid = 0;
	mutex_init(&data->update_lock);

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

	/* Initialize the GL520SM chip */
	gl520_init_client(new_client);

	/* Register sysfs hooks */
	if ((err = sysfs_create_group(&new_client->dev.kobj, &gl520_group)))
		goto exit_detach;

	if (data->two_temps) {
		if ((err = device_create_file(&new_client->dev,
					      &dev_attr_temp2_input))
		 || (err = device_create_file(&new_client->dev,
					      &dev_attr_temp2_max))
		 || (err = device_create_file(&new_client->dev,
					      &dev_attr_temp2_max_hyst)))
			goto exit_remove_files;
	} else {
		if ((err = device_create_file(&new_client->dev,
					      &dev_attr_in4_input))
		 || (err = device_create_file(&new_client->dev,
					      &dev_attr_in4_min))
		 || (err = device_create_file(&new_client->dev,
					      &dev_attr_in4_max)))
			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, &gl520_group);
	sysfs_remove_group(&new_client->dev.kobj, &gl520_group_opt);
exit_detach:
	i2c_detach_client(new_client);
exit_free:
	kfree(data);
exit:
	return err;
}


/* Called when we have found a new GL520SM. */
static void gl520_init_client(struct i2c_client *client)
{
	struct gl520_data *data = i2c_get_clientdata(client);
	u8 oldconf, conf;

	conf = oldconf = gl520_read_value(client, GL520_REG_CONF);

	data->alarm_mask = 0xff;
	data->vrm = vid_which_vrm();

	if (extra_sensor_type == 1)
		conf &= ~0x10;
	else if (extra_sensor_type == 2)
		conf |= 0x10;
	data->two_temps = !(conf & 0x10);

	/* If IRQ# is disabled, we can safely force comparator mode */
	if (!(conf & 0x20))
		conf &= 0xf7;

	/* Enable monitoring if needed */
	conf |= 0x40;

	if (conf != oldconf)
		gl520_write_value(client, GL520_REG_CONF, conf);

	gl520_update_device(&(client->dev));

	if (data->fan_min[0] == 0)
		data->alarm_mask &= ~0x20;
	if (data->fan_min[1] == 0)
		data->alarm_mask &= ~0x40;

	data->beep_mask &= data->alarm_mask;
	gl520_write_value(client, GL520_REG_BEEP_MASK, data->beep_mask);
}

static int gl520_detach_client(struct i2c_client *client)
{
	struct gl520_data *data = i2c_get_clientdata(client);
	int err;

	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&client->dev.kobj, &gl520_group);
	sysfs_remove_group(&client->dev.kobj, &gl520_group_opt);

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

	kfree(data);
	return 0;
}


/* Registers 0x07 to 0x0c are word-sized, others are byte-sized 
   GL520 uses a high-byte first convention */
static int gl520_read_value(struct i2c_client *client, u8 reg)
{
	if ((reg >= 0x07) && (reg <= 0x0c))
		return swab16(i2c_smbus_read_word_data(client, reg));
	else
		return i2c_smbus_read_byte_data(client, reg);
}

static int gl520_write_value(struct i2c_client *client, u8 reg, u16 value)
{
	if ((reg >= 0x07) && (reg <= 0x0c))
		return i2c_smbus_write_word_data(client, reg, swab16(value));
	else
		return i2c_smbus_write_byte_data(client, reg, value);
}


static struct gl520_data *gl520_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct gl520_data *data = i2c_get_clientdata(client);
	int val;

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {

		dev_dbg(&client->dev, "Starting gl520sm update\n");

		data->alarms = gl520_read_value(client, GL520_REG_ALARMS);
		data->beep_mask = gl520_read_value(client, GL520_REG_BEEP_MASK);
		data->vid = gl520_read_value(client, GL520_REG_VID_INPUT) & 0x1f;

		val = gl520_read_value(client, GL520_REG_IN0_LIMIT);
		data->in_min[0] = val & 0xff;
		data->in_max[0] = (val >> 8) & 0xff;
		val = gl520_read_value(client, GL520_REG_IN1_LIMIT);
		data->in_min[1] = val & 0xff;
		data->in_max[1] = (val >> 8) & 0xff;
		val = gl520_read_value(client, GL520_REG_IN2_LIMIT);
		data->in_min[2] = val & 0xff;
		data->in_max[2] = (val >> 8) & 0xff;
		val = gl520_read_value(client, GL520_REG_IN3_LIMIT);
		data->in_min[3] = val & 0xff;
		data->in_max[3] = (val >> 8) & 0xff;

		val = gl520_read_value(client, GL520_REG_FAN_INPUT);
		data->fan_input[0] = (val >> 8) & 0xff;
		data->fan_input[1] = val & 0xff;

		val = gl520_read_value(client, GL520_REG_FAN_MIN);
		data->fan_min[0] = (val >> 8) & 0xff;
		data->fan_min[1] = val & 0xff;

		data->temp_input[0] = gl520_read_value(client, GL520_REG_TEMP1_INPUT);
		data->temp_max[0] = gl520_read_value(client, GL520_REG_TEMP1_MAX);
		data->temp_max_hyst[0] = gl520_read_value(client, GL520_REG_TEMP1_MAX_HYST);

		val = gl520_read_value(client, GL520_REG_FAN_DIV);
		data->fan_div[0] = (val >> 6) & 0x03;
		data->fan_div[1] = (val >> 4) & 0x03;
		data->fan_off = (val >> 2) & 0x01;

		data->alarms &= data->alarm_mask;

		val = gl520_read_value(client, GL520_REG_CONF);
		data->beep_enable = !((val >> 2) & 1);

		data->in_input[0] = gl520_read_value(client, GL520_REG_IN0_INPUT);
		data->in_input[1] = gl520_read_value(client, GL520_REG_IN1_INPUT);
		data->in_input[2] = gl520_read_value(client, GL520_REG_IN2_INPUT);
		data->in_input[3] = gl520_read_value(client, GL520_REG_IN3_INPUT);

		/* Temp1 and Vin4 are the same input */
		if (data->two_temps) {
			data->temp_input[1] = gl520_read_value(client, GL520_REG_TEMP2_INPUT);
			data->temp_max[1] = gl520_read_value(client, GL520_REG_TEMP2_MAX);
			data->temp_max_hyst[1] = gl520_read_value(client, GL520_REG_TEMP2_MAX_HYST);
		} else {
			data->in_input[4] = gl520_read_value(client, GL520_REG_IN4_INPUT);
			data->in_min[4] = gl520_read_value(client, GL520_REG_IN4_MIN);
			data->in_max[4] = gl520_read_value(client, GL520_REG_IN4_MAX);
		}

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

	mutex_unlock(&data->update_lock);

	return data;
}


static int __init sensors_gl520sm_init(void)
{
	return i2c_add_driver(&gl520_driver);
}

static void __exit sensors_gl520sm_exit(void)
{
	i2c_del_driver(&gl520_driver);
}


MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
	"Kyösti Mälkki <kmalkki@cc.hut.fi>, "
	"Maarten Deprez <maartendeprez@users.sourceforge.net>");
MODULE_DESCRIPTION("GL520SM driver");
MODULE_LICENSE("GPL");

module_init(sensors_gl520sm_init);
module_exit(sensors_gl520sm_exit);