summaryrefslogtreecommitdiff
path: root/drivers/hwmon/adm1025.c
blob: c7a365a9e40551be9252af9bf57d916636546eeb (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
/*
 * adm1025.c
 *
 * Copyright (C) 2000       Chen-Yuan Wu <gwu@esoft.com>
 * Copyright (C) 2003-2004  Jean Delvare <khali@linux-fr.org>
 *
 * The ADM1025 is a sensor chip made by Analog Devices. It reports up to 6
 * voltages (including its own power source) and up to two temperatures
 * (its own plus up to one external one). Voltages are scaled internally
 * (which is not the common way) 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 deg accuracy. Complete
 * datasheet can be obtained from Analog's website at:
 *   http://www.analog.com/Analog_Root/productPage/productHome/0,2121,ADM1025,00.html
 *
 * This driver also supports the ADM1025A, which differs from the ADM1025
 * only in that it has "open-drain VID inputs while the ADM1025 has
 * on-chip 100k pull-ups on the VID inputs". It doesn't make any
 * difference for us.
 *
 * This driver also supports the NE1619, a sensor chip made by Philips.
 * That chip is similar to the ADM1025A, with a few differences. The only
 * difference that matters to us is that the NE1619 has only two possible
 * addresses while the ADM1025A has a third one. Complete datasheet can be
 * obtained from Philips's website at:
 *   http://www.semiconductors.philips.com/pip/NE1619DS.html
 *
 * Since the ADM1025 was the first chipset supported by this driver, most
 * comments will refer to this chipset, but are actually general and
 * concern all supported chipsets, unless mentioned otherwise.
 *
 * 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
 * ADM1025 and ADM1025A have three possible addresses: 0x2c, 0x2d and 0x2e.
 * NE1619 has two possible addresses: 0x2c and 0x2d.
 */

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

/*
 * Insmod parameters
 */

I2C_CLIENT_INSMOD_2(adm1025, ne1619);

/*
 * The ADM1025 registers
 */

#define ADM1025_REG_MAN_ID		0x3E
#define ADM1025_REG_CHIP_ID		0x3F
#define ADM1025_REG_CONFIG		0x40
#define ADM1025_REG_STATUS1		0x41
#define ADM1025_REG_STATUS2		0x42
#define ADM1025_REG_IN(nr)		(0x20 + (nr))
#define ADM1025_REG_IN_MAX(nr)		(0x2B + (nr) * 2)
#define ADM1025_REG_IN_MIN(nr)		(0x2C + (nr) * 2)
#define ADM1025_REG_TEMP(nr)		(0x26 + (nr))
#define ADM1025_REG_TEMP_HIGH(nr)	(0x37 + (nr) * 2)
#define ADM1025_REG_TEMP_LOW(nr)	(0x38 + (nr) * 2)
#define ADM1025_REG_VID			0x47
#define ADM1025_REG_VID4		0x49

/*
 * Conversions and various macros
 * The ADM1025 uses signed 8-bit values for temperatures.
 */

static const int in_scale[6] = { 2500, 2250, 3300, 5000, 12000, 3300 };

#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))

/*
 * Functions declaration
 */

static int adm1025_attach_adapter(struct i2c_adapter *adapter);
static int adm1025_detect(struct i2c_adapter *adapter, int address, int kind);
static void adm1025_init_client(struct i2c_client *client);
static int adm1025_detach_client(struct i2c_client *client);
static struct adm1025_data *adm1025_update_device(struct device *dev);

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

static struct i2c_driver adm1025_driver = {
	.driver = {
		.name	= "adm1025",
	},
	.id		= I2C_DRIVERID_ADM1025,
	.attach_adapter	= adm1025_attach_adapter,
	.detach_client	= adm1025_detach_client,
};

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

struct adm1025_data {
	struct i2c_client client;
	struct device *hwmon_dev;
	struct mutex update_lock;
	char valid; /* zero until following fields are valid */
	unsigned long last_updated; /* in jiffies */

	u8 in[6];		/* register value */
	u8 in_max[6];		/* register value */
	u8 in_min[6];		/* register value */
	s8 temp[2];		/* register value */
	s8 temp_min[2];		/* register value */
	s8 temp_max[2];		/* register value */
	u16 alarms;		/* register values, combined */
	u8 vid;			/* register values, combined */
	u8 vrm;
};

/*
 * Sysfs stuff
 */

static ssize_t
show_in(struct device *dev, struct device_attribute *attr, char *buf)
{
	int index = to_sensor_dev_attr(attr)->index;
	struct adm1025_data *data = adm1025_update_device(dev);
	return sprintf(buf, "%u\n", IN_FROM_REG(data->in[index],
		       in_scale[index]));
}

static ssize_t
show_in_min(struct device *dev, struct device_attribute *attr, char *buf)
{
	int index = to_sensor_dev_attr(attr)->index;
	struct adm1025_data *data = adm1025_update_device(dev);
	return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[index],
		       in_scale[index]));
}

static ssize_t
show_in_max(struct device *dev, struct device_attribute *attr, char *buf)
{
	int index = to_sensor_dev_attr(attr)->index;
	struct adm1025_data *data = adm1025_update_device(dev);
	return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[index],
		       in_scale[index]));
}

static ssize_t
show_temp(struct device *dev, struct device_attribute *attr, char *buf)
{
	int index = to_sensor_dev_attr(attr)->index;
	struct adm1025_data *data = adm1025_update_device(dev);
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[index]));
}

static ssize_t
show_temp_min(struct device *dev, struct device_attribute *attr, char *buf)
{
	int index = to_sensor_dev_attr(attr)->index;
	struct adm1025_data *data = adm1025_update_device(dev);
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[index]));
}

static ssize_t
show_temp_max(struct device *dev, struct device_attribute *attr, char *buf)
{
	int index = to_sensor_dev_attr(attr)->index;
	struct adm1025_data *data = adm1025_update_device(dev);
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[index]));
}

static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
			  const char *buf, size_t count)
{
	int index = to_sensor_dev_attr(attr)->index;
	struct i2c_client *client = to_i2c_client(dev);
	struct adm1025_data *data = i2c_get_clientdata(client);
	long val = simple_strtol(buf, NULL, 10);

	mutex_lock(&data->update_lock);
	data->in_min[index] = IN_TO_REG(val, in_scale[index]);
	i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MIN(index),
				  data->in_min[index]);
	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)
{
	int index = to_sensor_dev_attr(attr)->index;
	struct i2c_client *client = to_i2c_client(dev);
	struct adm1025_data *data = i2c_get_clientdata(client);
	long val = simple_strtol(buf, NULL, 10);

	mutex_lock(&data->update_lock);
	data->in_max[index] = IN_TO_REG(val, in_scale[index]);
	i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MAX(index),
				  data->in_max[index]);
	mutex_unlock(&data->update_lock);
	return count;
}

#define set_in(offset) \
static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
	show_in, NULL, offset); \
static SENSOR_DEVICE_ATTR(in##offset##_min, S_IWUSR | S_IRUGO, \
	show_in_min, set_in_min, offset); \
static SENSOR_DEVICE_ATTR(in##offset##_max, S_IWUSR | S_IRUGO, \
	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);

static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
			    const char *buf, size_t count)
{
	int index = to_sensor_dev_attr(attr)->index;
	struct i2c_client *client = to_i2c_client(dev);
	struct adm1025_data *data = i2c_get_clientdata(client);
	long val = simple_strtol(buf, NULL, 10);

	mutex_lock(&data->update_lock);
	data->temp_min[index] = TEMP_TO_REG(val);
	i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_LOW(index),
				  data->temp_min[index]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
	const char *buf, size_t count)
{
	int index = to_sensor_dev_attr(attr)->index;
	struct i2c_client *client = to_i2c_client(dev);
	struct adm1025_data *data = i2c_get_clientdata(client);
	long val = simple_strtol(buf, NULL, 10);

	mutex_lock(&data->update_lock);
	data->temp_max[index] = TEMP_TO_REG(val);
	i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_HIGH(index),
				  data->temp_max[index]);
	mutex_unlock(&data->update_lock);
	return count;
}

#define set_temp(offset) \
static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
	show_temp, NULL, offset - 1); \
static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IWUSR | S_IRUGO, \
	show_temp_min, set_temp_min, offset - 1); \
static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IWUSR | S_IRUGO, \
	show_temp_max, set_temp_max, offset - 1)
set_temp(1);
set_temp(2);

static ssize_t
show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct adm1025_data *data = adm1025_update_device(dev);
	return sprintf(buf, "%u\n", data->alarms);
}
static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);

static ssize_t
show_alarm(struct device *dev, struct device_attribute *attr, char *buf)
{
	int bitnr = to_sensor_dev_attr(attr)->index;
	struct adm1025_data *data = adm1025_update_device(dev);
	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(temp1_alarm, S_IRUGO, show_alarm, NULL, 5);
static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 4);
static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_alarm, NULL, 14);

static ssize_t
show_vid(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct adm1025_data *data = adm1025_update_device(dev);
	return sprintf(buf, "%u\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 adm1025_data *data = dev_get_drvdata(dev);
	return sprintf(buf, "%u\n", data->vrm);
}
static ssize_t set_vrm(struct device *dev, struct device_attribute *attr,
		       const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct adm1025_data *data = i2c_get_clientdata(client);
	data->vrm = simple_strtoul(buf, NULL, 10);
	return count;
}
static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);

/*
 * Real code
 */

static int adm1025_attach_adapter(struct i2c_adapter *adapter)
{
	if (!(adapter->class & I2C_CLASS_HWMON))
		return 0;
	return i2c_probe(adapter, &addr_data, adm1025_detect);
}

static struct attribute *adm1025_attributes[] = {
	&sensor_dev_attr_in0_input.dev_attr.attr,
	&sensor_dev_attr_in1_input.dev_attr.attr,
	&sensor_dev_attr_in2_input.dev_attr.attr,
	&sensor_dev_attr_in3_input.dev_attr.attr,
	&sensor_dev_attr_in5_input.dev_attr.attr,
	&sensor_dev_attr_in0_min.dev_attr.attr,
	&sensor_dev_attr_in1_min.dev_attr.attr,
	&sensor_dev_attr_in2_min.dev_attr.attr,
	&sensor_dev_attr_in3_min.dev_attr.attr,
	&sensor_dev_attr_in5_min.dev_attr.attr,
	&sensor_dev_attr_in0_max.dev_attr.attr,
	&sensor_dev_attr_in1_max.dev_attr.attr,
	&sensor_dev_attr_in2_max.dev_attr.attr,
	&sensor_dev_attr_in3_max.dev_attr.attr,
	&sensor_dev_attr_in5_max.dev_attr.attr,
	&sensor_dev_attr_in0_alarm.dev_attr.attr,
	&sensor_dev_attr_in1_alarm.dev_attr.attr,
	&sensor_dev_attr_in2_alarm.dev_attr.attr,
	&sensor_dev_attr_in3_alarm.dev_attr.attr,
	&sensor_dev_attr_in5_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&sensor_dev_attr_temp1_min.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_temp1_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_fault.dev_attr.attr,
	&dev_attr_alarms.attr,
	&dev_attr_cpu0_vid.attr,
	&dev_attr_vrm.attr,
	NULL
};

static const struct attribute_group adm1025_group = {
	.attrs = adm1025_attributes,
};

static struct attribute *adm1025_attributes_in4[] = {
	&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,
	NULL
};

static const struct attribute_group adm1025_group_in4 = {
	.attrs = adm1025_attributes_in4,
};

/*
 * The following function does more than just detection. If detection
 * succeeds, it also registers the new chip.
 */
static int adm1025_detect(struct i2c_adapter *adapter, int address, int kind)
{
	struct i2c_client *client;
	struct adm1025_data *data;
	int err = 0;
	const char *name = "";
	u8 config;

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

	if (!(data = kzalloc(sizeof(struct adm1025_data), GFP_KERNEL))) {
		err = -ENOMEM;
		goto exit;
	}

	client = &data->client;
	i2c_set_clientdata(client, data);
	client->addr = address;
	client->adapter = adapter;
	client->driver = &adm1025_driver;

	/*
	 * Now we do the remaining detection. A negative kind means that
	 * the driver was loaded with no force parameter (default), so we
	 * must both detect and identify the chip. A zero kind means that
	 * the driver was loaded with the force parameter, the detection
	 * step shall be skipped. A positive kind means that the driver
	 * was loaded with the force parameter and a given kind of chip is
	 * requested, so both the detection and the identification steps
	 * are skipped.
	 */
	config = i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG);
	if (kind < 0) { /* detection */
		if ((config & 0x80) != 0x00
		 || (i2c_smbus_read_byte_data(client,
		     ADM1025_REG_STATUS1) & 0xC0) != 0x00
		 || (i2c_smbus_read_byte_data(client,
		     ADM1025_REG_STATUS2) & 0xBC) != 0x00) {
			dev_dbg(&adapter->dev,
				"ADM1025 detection failed at 0x%02x.\n",
				address);
			goto exit_free;
		}
	}

	if (kind <= 0) { /* identification */
		u8 man_id, chip_id;

		man_id = i2c_smbus_read_byte_data(client, ADM1025_REG_MAN_ID);
		chip_id = i2c_smbus_read_byte_data(client, ADM1025_REG_CHIP_ID);

		if (man_id == 0x41) { /* Analog Devices */
			if ((chip_id & 0xF0) == 0x20) { /* ADM1025/ADM1025A */
				kind = adm1025;
			}
		} else
		if (man_id == 0xA1) { /* Philips */
			if (address != 0x2E
			 && (chip_id & 0xF0) == 0x20) { /* NE1619 */
				kind = ne1619;
			}
		}

		if (kind <= 0) { /* identification failed */
			dev_info(&adapter->dev,
			    "Unsupported chip (man_id=0x%02X, "
			    "chip_id=0x%02X).\n", man_id, chip_id);
			goto exit_free;
		}
	}

	if (kind == adm1025) {
		name = "adm1025";
	} else if (kind == ne1619) {
		name = "ne1619";
	}

	/* We can fill in the remaining client fields */
	strlcpy(client->name, name, I2C_NAME_SIZE);
	mutex_init(&data->update_lock);

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

	/* Initialize the ADM1025 chip */
	adm1025_init_client(client);

	/* Register sysfs hooks */
	if ((err = sysfs_create_group(&client->dev.kobj, &adm1025_group)))
		goto exit_detach;

	/* Pin 11 is either in4 (+12V) or VID4 */
	if (!(config & 0x20)) {
		if ((err = sysfs_create_group(&client->dev.kobj,
					      &adm1025_group_in4)))
			goto exit_remove;
	}

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

	return 0;

exit_remove:
	sysfs_remove_group(&client->dev.kobj, &adm1025_group);
	sysfs_remove_group(&client->dev.kobj, &adm1025_group_in4);
exit_detach:
	i2c_detach_client(client);
exit_free:
	kfree(data);
exit:
	return err;
}

static void adm1025_init_client(struct i2c_client *client)
{
	u8 reg;
	struct adm1025_data *data = i2c_get_clientdata(client);
	int i;

	data->vrm = vid_which_vrm();

	/*
	 * Set high limits
	 * Usually we avoid setting limits on driver init, but it happens
	 * that the ADM1025 comes with stupid default limits (all registers
	 * set to 0). In case the chip has not gone through any limit
	 * setting yet, we better set the high limits to the max so that
	 * no alarm triggers.
	 */
	for (i=0; i<6; i++) {
		reg = i2c_smbus_read_byte_data(client,
					       ADM1025_REG_IN_MAX(i));
		if (reg == 0)
			i2c_smbus_write_byte_data(client,
						  ADM1025_REG_IN_MAX(i),
						  0xFF);
	}
	for (i=0; i<2; i++) {
		reg = i2c_smbus_read_byte_data(client,
					       ADM1025_REG_TEMP_HIGH(i));
		if (reg == 0)
			i2c_smbus_write_byte_data(client,
						  ADM1025_REG_TEMP_HIGH(i),
						  0x7F);
	}

	/*
	 * Start the conversions
	 */
	reg = i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG);
	if (!(reg & 0x01))
		i2c_smbus_write_byte_data(client, ADM1025_REG_CONFIG,
					  (reg&0x7E)|0x01);
}

static int adm1025_detach_client(struct i2c_client *client)
{
	struct adm1025_data *data = i2c_get_clientdata(client);
	int err;

	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&client->dev.kobj, &adm1025_group);
	sysfs_remove_group(&client->dev.kobj, &adm1025_group_in4);

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

	kfree(data);
	return 0;
}

static struct adm1025_data *adm1025_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct adm1025_data *data = i2c_get_clientdata(client);

	mutex_lock(&data->update_lock);

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

		dev_dbg(&client->dev, "Updating data.\n");
		for (i=0; i<6; i++) {
			data->in[i] = i2c_smbus_read_byte_data(client,
				      ADM1025_REG_IN(i));
			data->in_min[i] = i2c_smbus_read_byte_data(client,
					  ADM1025_REG_IN_MIN(i));
			data->in_max[i] = i2c_smbus_read_byte_data(client,
					  ADM1025_REG_IN_MAX(i));
		}
		for (i=0; i<2; i++) {
			data->temp[i] = i2c_smbus_read_byte_data(client,
					ADM1025_REG_TEMP(i));
			data->temp_min[i] = i2c_smbus_read_byte_data(client,
					    ADM1025_REG_TEMP_LOW(i));
			data->temp_max[i] = i2c_smbus_read_byte_data(client,
					    ADM1025_REG_TEMP_HIGH(i));
		}
		data->alarms = i2c_smbus_read_byte_data(client,
			       ADM1025_REG_STATUS1)
			     | (i2c_smbus_read_byte_data(client,
				ADM1025_REG_STATUS2) << 8);
		data->vid = (i2c_smbus_read_byte_data(client,
			     ADM1025_REG_VID) & 0x0f)
			  | ((i2c_smbus_read_byte_data(client,
			      ADM1025_REG_VID4) & 0x01) << 4);

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

	mutex_unlock(&data->update_lock);

	return data;
}

static int __init sensors_adm1025_init(void)
{
	return i2c_add_driver(&adm1025_driver);
}

static void __exit sensors_adm1025_exit(void)
{
	i2c_del_driver(&adm1025_driver);
}

MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
MODULE_DESCRIPTION("ADM1025 driver");
MODULE_LICENSE("GPL");

module_init(sensors_adm1025_init);
module_exit(sensors_adm1025_exit);