summaryrefslogtreecommitdiff
path: root/drivers/hwmon/gl518sm.c
blob: 5788bbb77d8d5934b3a3c958a4d564aaba6ddefa (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
/*
 * gl518sm.c - Part of lm_sensors, Linux kernel modules for hardware
 *             monitoring
 * Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and
 * Kyosti Malkki <kmalkki@cc.hut.fi>
 * Copyright (C) 2004 Hong-Gunn Chew <hglinux@gunnet.org> and
 * Jean Delvare <khali@linux-fr.org>
 *
 * 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.
 *
 * Ported to Linux 2.6 by Hong-Gunn Chew with the help of Jean Delvare
 * and advice of Greg Kroah-Hartman.
 *
 * Notes about the port:
 * Release 0x00 of the GL518SM chipset doesn't support reading of in0,
 * in1 nor in2. The original driver had an ugly workaround to get them
 * anyway (changing limits and watching alarms trigger and wear off).
 * We did not keep that part of the original driver in the Linux 2.6
 * version, since it was making the driver significantly more complex
 * with no real benefit.
 *
 * History:
 * 2004-01-28  Original port. (Hong-Gunn Chew)
 * 2004-01-31  Code review and approval. (Jean Delvare)
 */

#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/err.h>

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

/* Insmod parameters */
I2C_CLIENT_INSMOD_2(gl518sm_r00, gl518sm_r80);

/* Many GL518 constants specified below */

/* The GL518 registers */
#define GL518_REG_CHIP_ID	0x00
#define GL518_REG_REVISION	0x01
#define GL518_REG_VENDOR_ID	0x02
#define GL518_REG_CONF		0x03
#define GL518_REG_TEMP_IN	0x04
#define GL518_REG_TEMP_MAX	0x05
#define GL518_REG_TEMP_HYST	0x06
#define GL518_REG_FAN_COUNT	0x07
#define GL518_REG_FAN_LIMIT	0x08
#define GL518_REG_VIN1_LIMIT	0x09
#define GL518_REG_VIN2_LIMIT	0x0a
#define GL518_REG_VIN3_LIMIT	0x0b
#define GL518_REG_VDD_LIMIT	0x0c
#define GL518_REG_VIN3		0x0d
#define GL518_REG_MISC		0x0f
#define GL518_REG_ALARM		0x10
#define GL518_REG_MASK		0x11
#define GL518_REG_INT		0x12
#define GL518_REG_VIN2		0x13
#define GL518_REG_VIN1		0x14
#define GL518_REG_VDD		0x15


/*
 * Conversions. Rounding and limit checking is only done on the TO_REG
 * variants. Note that you should be a bit careful with which arguments
 * these macros are called: arguments may be evaluated more than once.
 * Fixing this is just not worth it.
 */

#define RAW_FROM_REG(val)	val

#define BOOL_FROM_REG(val)	((val)?0:1)
#define BOOL_TO_REG(val)	((val)?0:1)

#define TEMP_TO_REG(val)	(SENSORS_LIMIT(((((val)<0? \
				(val)-500:(val)+500)/1000)+119),0,255))
#define TEMP_FROM_REG(val)	(((val) - 119) * 1000)

static inline u8 FAN_TO_REG(long rpm, int div)
{
	long rpmdiv;
	if (rpm == 0)
		return 0;
	rpmdiv = SENSORS_LIMIT(rpm, 1, 1920000) * div;
	return SENSORS_LIMIT((960000 + rpmdiv / 2) / rpmdiv, 1, 255);
}
#define FAN_FROM_REG(val,div)	((val)==0 ? 0 : (960000/((val)*(div))))

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

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

#define DIV_TO_REG(val)		((val)==4?2:(val)==2?1:(val)==1?0:3)
#define DIV_FROM_REG(val)	(1 << (val))

#define BEEP_MASK_TO_REG(val)	((val) & 0x7f & data->alarm_mask)
#define BEEP_MASK_FROM_REG(val)	((val) & 0x7f)

/* Each client has this additional data */
struct gl518_data {
	struct i2c_client client;
	struct class_device *class_dev;
	enum chips type;

	struct semaphore update_lock;
	char valid;		/* !=0 if following fields are valid */
	unsigned long last_updated;	/* In jiffies */

	u8 voltage_in[4];	/* Register values; [0] = VDD */
	u8 voltage_min[4];	/* Register values; [0] = VDD */
	u8 voltage_max[4];	/* Register values; [0] = VDD */
	u8 iter_voltage_in[4];	/* Register values; [0] = VDD */
	u8 fan_in[2];
	u8 fan_min[2];
	u8 fan_div[2];		/* Register encoding, shifted right */
	u8 fan_auto1;		/* Boolean */
	u8 temp_in;		/* Register values */
	u8 temp_max;		/* Register values */
	u8 temp_hyst;		/* Register values */
	u8 alarms;		/* Register value */
	u8 alarm_mask;		/* Register value */
	u8 beep_mask;		/* Register value */
	u8 beep_enable;		/* Boolean */
};

static int gl518_attach_adapter(struct i2c_adapter *adapter);
static int gl518_detect(struct i2c_adapter *adapter, int address, int kind);
static void gl518_init_client(struct i2c_client *client);
static int gl518_detach_client(struct i2c_client *client);
static int gl518_read_value(struct i2c_client *client, u8 reg);
static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value);
static struct gl518_data *gl518_update_device(struct device *dev);

/* This is the driver that will be inserted */
static struct i2c_driver gl518_driver = {
	.owner		= THIS_MODULE,
	.name		= "gl518sm",
	.id		= I2C_DRIVERID_GL518,
	.attach_adapter	= gl518_attach_adapter,
	.detach_client	= gl518_detach_client,
};

/*
 * Sysfs stuff
 */

#define show(type, suffix, value)					\
static ssize_t show_##suffix(struct device *dev, struct device_attribute *attr, char *buf)		\
{									\
	struct gl518_data *data = gl518_update_device(dev);		\
	return sprintf(buf, "%d\n", type##_FROM_REG(data->value));	\
}

#define show_fan(suffix, value, index)					\
static ssize_t show_##suffix(struct device *dev, struct device_attribute *attr, char *buf)		\
{									\
	struct gl518_data *data = gl518_update_device(dev);		\
	return sprintf(buf, "%d\n", FAN_FROM_REG(data->value[index],	\
		DIV_FROM_REG(data->fan_div[index])));			\
}

show(TEMP, temp_input1, temp_in);
show(TEMP, temp_max1, temp_max);
show(TEMP, temp_hyst1, temp_hyst);
show(BOOL, fan_auto1, fan_auto1);
show_fan(fan_input1, fan_in, 0);
show_fan(fan_input2, fan_in, 1);
show_fan(fan_min1, fan_min, 0);
show_fan(fan_min2, fan_min, 1);
show(DIV, fan_div1, fan_div[0]);
show(DIV, fan_div2, fan_div[1]);
show(VDD, in_input0, voltage_in[0]);
show(IN, in_input1, voltage_in[1]);
show(IN, in_input2, voltage_in[2]);
show(IN, in_input3, voltage_in[3]);
show(VDD, in_min0, voltage_min[0]);
show(IN, in_min1, voltage_min[1]);
show(IN, in_min2, voltage_min[2]);
show(IN, in_min3, voltage_min[3]);
show(VDD, in_max0, voltage_max[0]);
show(IN, in_max1, voltage_max[1]);
show(IN, in_max2, voltage_max[2]);
show(IN, in_max3, voltage_max[3]);
show(RAW, alarms, alarms);
show(BOOL, beep_enable, beep_enable);
show(BEEP_MASK, beep_mask, beep_mask);

#define set(type, suffix, value, reg)					\
static ssize_t set_##suffix(struct device *dev, struct device_attribute *attr, const char *buf,	\
	size_t count)							\
{									\
	struct i2c_client *client = to_i2c_client(dev);			\
	struct gl518_data *data = i2c_get_clientdata(client);		\
	long val = simple_strtol(buf, NULL, 10);			\
									\
	down(&data->update_lock);					\
	data->value = type##_TO_REG(val);				\
	gl518_write_value(client, reg, data->value);			\
	up(&data->update_lock);						\
	return count;							\
}

#define set_bits(type, suffix, value, reg, mask, shift)			\
static ssize_t set_##suffix(struct device *dev, struct device_attribute *attr, const char *buf,	\
	size_t count)							\
{									\
	struct i2c_client *client = to_i2c_client(dev);			\
	struct gl518_data *data = i2c_get_clientdata(client);		\
	int regvalue;							\
	unsigned long val = simple_strtoul(buf, NULL, 10);		\
									\
	down(&data->update_lock);					\
	regvalue = gl518_read_value(client, reg);			\
	data->value = type##_TO_REG(val);				\
	regvalue = (regvalue & ~mask) | (data->value << shift);		\
	gl518_write_value(client, reg, regvalue);			\
	up(&data->update_lock);						\
	return count;							\
}

#define set_low(type, suffix, value, reg)				\
	set_bits(type, suffix, value, reg, 0x00ff, 0)
#define set_high(type, suffix, value, reg)				\
	set_bits(type, suffix, value, reg, 0xff00, 8)

set(TEMP, temp_max1, temp_max, GL518_REG_TEMP_MAX);
set(TEMP, temp_hyst1, temp_hyst, GL518_REG_TEMP_HYST);
set_bits(BOOL, fan_auto1, fan_auto1, GL518_REG_MISC, 0x08, 3);
set_bits(DIV, fan_div1, fan_div[0], GL518_REG_MISC, 0xc0, 6);
set_bits(DIV, fan_div2, fan_div[1], GL518_REG_MISC, 0x30, 4);
set_low(VDD, in_min0, voltage_min[0], GL518_REG_VDD_LIMIT);
set_low(IN, in_min1, voltage_min[1], GL518_REG_VIN1_LIMIT);
set_low(IN, in_min2, voltage_min[2], GL518_REG_VIN2_LIMIT);
set_low(IN, in_min3, voltage_min[3], GL518_REG_VIN3_LIMIT);
set_high(VDD, in_max0, voltage_max[0], GL518_REG_VDD_LIMIT);
set_high(IN, in_max1, voltage_max[1], GL518_REG_VIN1_LIMIT);
set_high(IN, in_max2, voltage_max[2], GL518_REG_VIN2_LIMIT);
set_high(IN, in_max3, voltage_max[3], GL518_REG_VIN3_LIMIT);
set_bits(BOOL, beep_enable, beep_enable, GL518_REG_CONF, 0x04, 2);
set(BEEP_MASK, beep_mask, beep_mask, GL518_REG_ALARM);

static ssize_t set_fan_min1(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct gl518_data *data = i2c_get_clientdata(client);
	int regvalue;
	unsigned long val = simple_strtoul(buf, NULL, 10);

	down(&data->update_lock);
	regvalue = gl518_read_value(client, GL518_REG_FAN_LIMIT);
	data->fan_min[0] = FAN_TO_REG(val,
		DIV_FROM_REG(data->fan_div[0]));
	regvalue = (regvalue & 0x00ff) | (data->fan_min[0] << 8);
	gl518_write_value(client, GL518_REG_FAN_LIMIT, regvalue);

	data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
	if (data->fan_min[0] == 0)
		data->alarm_mask &= ~0x20;
	else
		data->alarm_mask |= 0x20;
	data->beep_mask &= data->alarm_mask;
	gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);

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

static ssize_t set_fan_min2(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct gl518_data *data = i2c_get_clientdata(client);
	int regvalue;
	unsigned long val = simple_strtoul(buf, NULL, 10);

	down(&data->update_lock);
	regvalue = gl518_read_value(client, GL518_REG_FAN_LIMIT);
	data->fan_min[1] = FAN_TO_REG(val,
		DIV_FROM_REG(data->fan_div[1]));
	regvalue = (regvalue & 0xff00) | data->fan_min[1];
	gl518_write_value(client, GL518_REG_FAN_LIMIT, regvalue);

	data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
	if (data->fan_min[1] == 0)
		data->alarm_mask &= ~0x40;
	else
		data->alarm_mask |= 0x40;
	data->beep_mask &= data->alarm_mask;
	gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);

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

static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
static DEVICE_ATTR(temp1_max, S_IWUSR|S_IRUGO, show_temp_max1, set_temp_max1);
static DEVICE_ATTR(temp1_max_hyst, S_IWUSR|S_IRUGO,
	show_temp_hyst1, set_temp_hyst1);
static DEVICE_ATTR(fan1_auto, S_IWUSR|S_IRUGO, show_fan_auto1, set_fan_auto1);
static DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input1, NULL);
static DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input2, NULL);
static DEVICE_ATTR(fan1_min, S_IWUSR|S_IRUGO, show_fan_min1, set_fan_min1);
static DEVICE_ATTR(fan2_min, S_IWUSR|S_IRUGO, show_fan_min2, set_fan_min2);
static DEVICE_ATTR(fan1_div, S_IWUSR|S_IRUGO, show_fan_div1, set_fan_div1);
static DEVICE_ATTR(fan2_div, S_IWUSR|S_IRUGO, show_fan_div2, set_fan_div2);
static DEVICE_ATTR(in0_input, S_IRUGO, show_in_input0, NULL);
static DEVICE_ATTR(in1_input, S_IRUGO, show_in_input1, NULL);
static DEVICE_ATTR(in2_input, S_IRUGO, show_in_input2, NULL);
static DEVICE_ATTR(in3_input, S_IRUGO, show_in_input3, NULL);
static DEVICE_ATTR(in0_min, S_IWUSR|S_IRUGO, show_in_min0, set_in_min0);
static DEVICE_ATTR(in1_min, S_IWUSR|S_IRUGO, show_in_min1, set_in_min1);
static DEVICE_ATTR(in2_min, S_IWUSR|S_IRUGO, show_in_min2, set_in_min2);
static DEVICE_ATTR(in3_min, S_IWUSR|S_IRUGO, show_in_min3, set_in_min3);
static DEVICE_ATTR(in0_max, S_IWUSR|S_IRUGO, show_in_max0, set_in_max0);
static DEVICE_ATTR(in1_max, S_IWUSR|S_IRUGO, show_in_max1, set_in_max1);
static DEVICE_ATTR(in2_max, S_IWUSR|S_IRUGO, show_in_max2, set_in_max2);
static DEVICE_ATTR(in3_max, S_IWUSR|S_IRUGO, show_in_max3, set_in_max3);
static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
static DEVICE_ATTR(beep_enable, S_IWUSR|S_IRUGO,
	show_beep_enable, set_beep_enable);
static DEVICE_ATTR(beep_mask, S_IWUSR|S_IRUGO,
	show_beep_mask, set_beep_mask);

/*
 * Real code
 */

static int gl518_attach_adapter(struct i2c_adapter *adapter)
{
	if (!(adapter->class & I2C_CLASS_HWMON))
		return 0;
	return i2c_probe(adapter, &addr_data, gl518_detect);
}

static int gl518_detect(struct i2c_adapter *adapter, int address, int kind)
{
	int i;
	struct i2c_client *new_client;
	struct gl518_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 gl518_{read,write}_value. */

	if (!(data = kzalloc(sizeof(struct gl518_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 = &gl518_driver;
	new_client->flags = 0;

	/* Now, we do the remaining detection. */

	if (kind < 0) {
		if ((gl518_read_value(new_client, GL518_REG_CHIP_ID) != 0x80)
		 || (gl518_read_value(new_client, GL518_REG_CONF) & 0x80))
			goto exit_free;
	}

	/* Determine the chip type. */
	if (kind <= 0) {
		i = gl518_read_value(new_client, GL518_REG_REVISION);
		if (i == 0x00) {
			kind = gl518sm_r00;
		} else if (i == 0x80) {
			kind = gl518sm_r80;
		} else {
			if (kind <= 0)
				dev_info(&adapter->dev,
				    "Ignoring 'force' parameter for unknown "
				    "chip at adapter %d, address 0x%02x\n",
				    i2c_adapter_id(adapter), address);
			goto exit_free;
		}
	}

	/* Fill in the remaining client fields */
	strlcpy(new_client->name, "gl518sm", I2C_NAME_SIZE);
	data->type = kind;
	data->valid = 0;
	init_MUTEX(&data->update_lock);

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

	/* Initialize the GL518SM chip */
	data->alarm_mask = 0xff;
	data->voltage_in[0]=data->voltage_in[1]=data->voltage_in[2]=0;
	gl518_init_client((struct i2c_client *) new_client);

	/* Register sysfs hooks */
	data->class_dev = hwmon_device_register(&new_client->dev);
	if (IS_ERR(data->class_dev)) {
		err = PTR_ERR(data->class_dev);
		goto exit_detach;
	}

	device_create_file(&new_client->dev, &dev_attr_in0_input);
	device_create_file(&new_client->dev, &dev_attr_in1_input);
	device_create_file(&new_client->dev, &dev_attr_in2_input);
	device_create_file(&new_client->dev, &dev_attr_in3_input);
	device_create_file(&new_client->dev, &dev_attr_in0_min);
	device_create_file(&new_client->dev, &dev_attr_in1_min);
	device_create_file(&new_client->dev, &dev_attr_in2_min);
	device_create_file(&new_client->dev, &dev_attr_in3_min);
	device_create_file(&new_client->dev, &dev_attr_in0_max);
	device_create_file(&new_client->dev, &dev_attr_in1_max);
	device_create_file(&new_client->dev, &dev_attr_in2_max);
	device_create_file(&new_client->dev, &dev_attr_in3_max);
	device_create_file(&new_client->dev, &dev_attr_fan1_auto);
	device_create_file(&new_client->dev, &dev_attr_fan1_input);
	device_create_file(&new_client->dev, &dev_attr_fan2_input);
	device_create_file(&new_client->dev, &dev_attr_fan1_min);
	device_create_file(&new_client->dev, &dev_attr_fan2_min);
	device_create_file(&new_client->dev, &dev_attr_fan1_div);
	device_create_file(&new_client->dev, &dev_attr_fan2_div);
	device_create_file(&new_client->dev, &dev_attr_temp1_input);
	device_create_file(&new_client->dev, &dev_attr_temp1_max);
	device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst);
	device_create_file(&new_client->dev, &dev_attr_alarms);
	device_create_file(&new_client->dev, &dev_attr_beep_enable);
	device_create_file(&new_client->dev, &dev_attr_beep_mask);

	return 0;

/* OK, this is not exactly good programming practice, usually. But it is
   very code-efficient in this case. */

exit_detach:
	i2c_detach_client(new_client);
exit_free:
	kfree(data);
exit:
	return err;
}


/* Called when we have found a new GL518SM.
   Note that we preserve D4:NoFan2 and D2:beep_enable. */
static void gl518_init_client(struct i2c_client *client)
{
	/* Make sure we leave D7:Reset untouched */
	u8 regvalue = gl518_read_value(client, GL518_REG_CONF) & 0x7f;

	/* Comparator mode (D3=0), standby mode (D6=0) */
	gl518_write_value(client, GL518_REG_CONF, (regvalue &= 0x37));

	/* Never interrupts */
	gl518_write_value(client, GL518_REG_MASK, 0x00);

	/* Clear status register (D5=1), start (D6=1) */
	gl518_write_value(client, GL518_REG_CONF, 0x20 | regvalue);
	gl518_write_value(client, GL518_REG_CONF, 0x40 | regvalue);
}

static int gl518_detach_client(struct i2c_client *client)
{
	struct gl518_data *data = i2c_get_clientdata(client);
	int err;

	hwmon_device_unregister(data->class_dev);

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

	kfree(data);
	return 0;
}

/* Registers 0x07 to 0x0c are word-sized, others are byte-sized 
   GL518 uses a high-byte first convention, which is exactly opposite to
   the usual practice. */
static int gl518_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);
}

/* Registers 0x07 to 0x0c are word-sized, others are byte-sized 
   GL518 uses a high-byte first convention, which is exactly opposite to
   the usual practice. */
static int gl518_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 gl518_data *gl518_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct gl518_data *data = i2c_get_clientdata(client);
	int val;

	down(&data->update_lock);

	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
	    || !data->valid) {
		dev_dbg(&client->dev, "Starting gl518 update\n");

		data->alarms = gl518_read_value(client, GL518_REG_INT);
		data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);

		val = gl518_read_value(client, GL518_REG_VDD_LIMIT);
		data->voltage_min[0] = val & 0xff;
		data->voltage_max[0] = (val >> 8) & 0xff;
		val = gl518_read_value(client, GL518_REG_VIN1_LIMIT);
		data->voltage_min[1] = val & 0xff;
		data->voltage_max[1] = (val >> 8) & 0xff;
		val = gl518_read_value(client, GL518_REG_VIN2_LIMIT);
		data->voltage_min[2] = val & 0xff;
		data->voltage_max[2] = (val >> 8) & 0xff;
		val = gl518_read_value(client, GL518_REG_VIN3_LIMIT);
		data->voltage_min[3] = val & 0xff;
		data->voltage_max[3] = (val >> 8) & 0xff;

		val = gl518_read_value(client, GL518_REG_FAN_COUNT);
		data->fan_in[0] = (val >> 8) & 0xff;
		data->fan_in[1] = val & 0xff;

		val = gl518_read_value(client, GL518_REG_FAN_LIMIT);
		data->fan_min[0] = (val >> 8) & 0xff;
		data->fan_min[1] = val & 0xff;

		data->temp_in = gl518_read_value(client, GL518_REG_TEMP_IN);
		data->temp_max =
		    gl518_read_value(client, GL518_REG_TEMP_MAX);
		data->temp_hyst =
		    gl518_read_value(client, GL518_REG_TEMP_HYST);

		val = gl518_read_value(client, GL518_REG_MISC);
		data->fan_div[0] = (val >> 6) & 0x03;
		data->fan_div[1] = (val >> 4) & 0x03;
		data->fan_auto1  = (val >> 3) & 0x01;

		data->alarms &= data->alarm_mask;

		val = gl518_read_value(client, GL518_REG_CONF);
		data->beep_enable = (val >> 2) & 1;

		if (data->type != gl518sm_r00) {
			data->voltage_in[0] =
			    gl518_read_value(client, GL518_REG_VDD);
			data->voltage_in[1] =
			    gl518_read_value(client, GL518_REG_VIN1);
			data->voltage_in[2] =
			    gl518_read_value(client, GL518_REG_VIN2);
		}
		data->voltage_in[3] =
		    gl518_read_value(client, GL518_REG_VIN3);

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

	up(&data->update_lock);

	return data;
}

static int __init sensors_gl518sm_init(void)
{
	return i2c_add_driver(&gl518_driver);
}

static void __exit sensors_gl518sm_exit(void)
{
	i2c_del_driver(&gl518_driver);
}

MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
	"Kyosti Malkki <kmalkki@cc.hut.fi> and "
	"Hong-Gunn Chew <hglinux@gunnet.org>");
MODULE_DESCRIPTION("GL518SM driver");
MODULE_LICENSE("GPL");

module_init(sensors_gl518sm_init);
module_exit(sensors_gl518sm_exit);