summaryrefslogblamecommitdiffstats
path: root/drivers/hwmon/nct7802.c
blob: 28fcb2e246d55a7acc52703e434b98de3e22c45b (plain) (tree)
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




































































































































































































































































































































































































































































































































































                                                                                
                                                                         






































































































































































































































                                                                                
                                                           













































































                                                                             
/*
 * nct7802 - Driver for Nuvoton NCT7802Y
 *
 * Copyright (C) 2014  Guenter Roeck <linux@roeck-us.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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

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

#define DRVNAME "nct7802"

static const u8 REG_VOLTAGE[5] = { 0x09, 0x0a, 0x0c, 0x0d, 0x0e };

static const u8 REG_VOLTAGE_LIMIT_LSB[2][5] = {
	{ 0x40, 0x00, 0x42, 0x44, 0x46 },
	{ 0x3f, 0x00, 0x41, 0x43, 0x45 },
};

static const u8 REG_VOLTAGE_LIMIT_MSB[5] = { 0x48, 0x00, 0x47, 0x47, 0x48 };

static const u8 REG_VOLTAGE_LIMIT_MSB_SHIFT[2][5] = {
	{ 0, 0, 4, 0, 4 },
	{ 2, 0, 6, 2, 6 },
};

#define REG_BANK		0x00
#define REG_TEMP_LSB		0x05
#define REG_TEMP_PECI_LSB	0x08
#define REG_VOLTAGE_LOW		0x0f
#define REG_FANCOUNT_LOW	0x13
#define REG_START		0x21
#define REG_MODE		0x22
#define REG_PECI_ENABLE		0x23
#define REG_FAN_ENABLE		0x24
#define REG_VMON_ENABLE		0x25
#define REG_VENDOR_ID		0xfd
#define REG_CHIP_ID		0xfe
#define REG_VERSION_ID		0xff

/*
 * Data structures and manipulation thereof
 */

struct nct7802_data {
	struct regmap *regmap;
	struct mutex access_lock; /* for multi-byte read and write operations */
};

static int nct7802_read_temp(struct nct7802_data *data,
			     u8 reg_temp, u8 reg_temp_low, int *temp)
{
	unsigned int t1, t2 = 0;
	int err;

	*temp = 0;

	mutex_lock(&data->access_lock);
	err = regmap_read(data->regmap, reg_temp, &t1);
	if (err < 0)
		goto abort;
	t1 <<= 8;
	if (reg_temp_low) {	/* 11 bit data */
		err = regmap_read(data->regmap, reg_temp_low, &t2);
		if (err < 0)
			goto abort;
	}
	t1 |= t2 & 0xe0;
	*temp = (s16)t1 / 32 * 125;
abort:
	mutex_unlock(&data->access_lock);
	return err;
}

static int nct7802_read_fan(struct nct7802_data *data, u8 reg_fan)
{
	unsigned int f1, f2;
	int ret;

	mutex_lock(&data->access_lock);
	ret = regmap_read(data->regmap, reg_fan, &f1);
	if (ret < 0)
		goto abort;
	ret = regmap_read(data->regmap, REG_FANCOUNT_LOW, &f2);
	if (ret < 0)
		goto abort;
	ret = (f1 << 5) | (f2 >> 3);
	/* convert fan count to rpm */
	if (ret == 0x1fff)	/* maximum value, assume fan is stopped */
		ret = 0;
	else if (ret)
		ret = DIV_ROUND_CLOSEST(1350000U, ret);
abort:
	mutex_unlock(&data->access_lock);
	return ret;
}

static int nct7802_read_fan_min(struct nct7802_data *data, u8 reg_fan_low,
				u8 reg_fan_high)
{
	unsigned int f1, f2;
	int ret;

	mutex_lock(&data->access_lock);
	ret = regmap_read(data->regmap, reg_fan_low, &f1);
	if (ret < 0)
		goto abort;
	ret = regmap_read(data->regmap, reg_fan_high, &f2);
	if (ret < 0)
		goto abort;
	ret = f1 | ((f2 & 0xf8) << 5);
	/* convert fan count to rpm */
	if (ret == 0x1fff)	/* maximum value, assume no limit */
		ret = 0;
	else if (ret)
		ret = DIV_ROUND_CLOSEST(1350000U, ret);
abort:
	mutex_unlock(&data->access_lock);
	return ret;
}

static int nct7802_write_fan_min(struct nct7802_data *data, u8 reg_fan_low,
				 u8 reg_fan_high, unsigned int limit)
{
	int err;

	if (limit)
		limit = DIV_ROUND_CLOSEST(1350000U, limit);
	else
		limit = 0x1fff;
	limit = clamp_val(limit, 0, 0x1fff);

	mutex_lock(&data->access_lock);
	err = regmap_write(data->regmap, reg_fan_low, limit & 0xff);
	if (err < 0)
		goto abort;

	err = regmap_write(data->regmap, reg_fan_high, (limit & 0x1f00) >> 5);
abort:
	mutex_unlock(&data->access_lock);
	return err;
}

static u8 nct7802_vmul[] = { 4, 2, 2, 2, 2 };

static int nct7802_read_voltage(struct nct7802_data *data, int nr, int index)
{
	unsigned int v1, v2;
	int ret;

	mutex_lock(&data->access_lock);
	if (index == 0) {	/* voltage */
		ret = regmap_read(data->regmap, REG_VOLTAGE[nr], &v1);
		if (ret < 0)
			goto abort;
		ret = regmap_read(data->regmap, REG_VOLTAGE_LOW, &v2);
		if (ret < 0)
			goto abort;
		ret = ((v1 << 2) | (v2 >> 6)) * nct7802_vmul[nr];
	}  else {	/* limit */
		int shift = 8 - REG_VOLTAGE_LIMIT_MSB_SHIFT[index - 1][nr];

		ret = regmap_read(data->regmap,
				  REG_VOLTAGE_LIMIT_LSB[index - 1][nr], &v1);
		if (ret < 0)
			goto abort;
		ret = regmap_read(data->regmap, REG_VOLTAGE_LIMIT_MSB[nr],
				  &v2);
		if (ret < 0)
			goto abort;
		ret = (v1 | ((v2 << shift) & 0x300)) * nct7802_vmul[nr];
	}
abort:
	mutex_unlock(&data->access_lock);
	return ret;
}

static int nct7802_write_voltage(struct nct7802_data *data, int nr, int index,
				 unsigned int voltage)
{
	int shift = 8 - REG_VOLTAGE_LIMIT_MSB_SHIFT[index - 1][nr];
	int err;

	voltage = DIV_ROUND_CLOSEST(voltage, nct7802_vmul[nr]);
	voltage = clamp_val(voltage, 0, 0x3ff);

	mutex_lock(&data->access_lock);
	err = regmap_write(data->regmap,
			   REG_VOLTAGE_LIMIT_LSB[index - 1][nr],
			   voltage & 0xff);
	if (err < 0)
		goto abort;

	err = regmap_update_bits(data->regmap, REG_VOLTAGE_LIMIT_MSB[nr],
				 0x0300 >> shift, (voltage & 0x0300) >> shift);
abort:
	mutex_unlock(&data->access_lock);
	return err;
}

static ssize_t show_in(struct device *dev, struct device_attribute *attr,
		       char *buf)
{
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	struct nct7802_data *data = dev_get_drvdata(dev);
	int voltage;

	voltage = nct7802_read_voltage(data, sattr->nr, sattr->index);
	if (voltage < 0)
		return voltage;

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

static ssize_t store_in(struct device *dev, struct device_attribute *attr,
			const char *buf, size_t count)
{
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	struct nct7802_data *data = dev_get_drvdata(dev);
	int index = sattr->index;
	int nr = sattr->nr;
	unsigned long val;
	int err;

	err = kstrtoul(buf, 10, &val);
	if (err < 0)
		return err;

	err = nct7802_write_voltage(data, nr, index, val);
	return err ? : count;
}

static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct nct7802_data *data = dev_get_drvdata(dev);
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	int err, temp;

	err = nct7802_read_temp(data, sattr->nr, sattr->index, &temp);
	if (err < 0)
		return err;

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

static ssize_t store_temp(struct device *dev, struct device_attribute *attr,
			  const char *buf, size_t count)
{
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	struct nct7802_data *data = dev_get_drvdata(dev);
	int nr = sattr->nr;
	long val;
	int err;

	err = kstrtol(buf, 10, &val);
	if (err < 0)
		return err;

	val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), -128, 127);

	err = regmap_write(data->regmap, nr, val & 0xff);
	return err ? : count;
}

static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
			char *buf)
{
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	struct nct7802_data *data = dev_get_drvdata(dev);
	int speed;

	speed = nct7802_read_fan(data, sattr->index);
	if (speed < 0)
		return speed;

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

static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr,
			    char *buf)
{
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	struct nct7802_data *data = dev_get_drvdata(dev);
	int speed;

	speed = nct7802_read_fan_min(data, sattr->nr, sattr->index);
	if (speed < 0)
		return speed;

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

static ssize_t store_fan_min(struct device *dev, struct device_attribute *attr,
			     const char *buf, size_t count)
{
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	struct nct7802_data *data = dev_get_drvdata(dev);
	unsigned long val;
	int err;

	err = kstrtoul(buf, 10, &val);
	if (err < 0)
		return err;

	err = nct7802_write_fan_min(data, sattr->nr, sattr->index, val);
	return err ? : count;
}

static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
	struct nct7802_data *data = dev_get_drvdata(dev);
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	int bit = sattr->index;
	unsigned int val;
	int ret;

	ret = regmap_read(data->regmap, sattr->nr, &val);
	if (ret < 0)
		return ret;

	return sprintf(buf, "%u\n", !!(val & (1 << bit)));
}

static ssize_t
show_beep(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	struct nct7802_data *data = dev_get_drvdata(dev);
	unsigned int regval;
	int err;

	err = regmap_read(data->regmap, sattr->nr, &regval);
	if (err)
		return err;

	return sprintf(buf, "%u\n", !!(regval & (1 << sattr->index)));
}

static ssize_t
store_beep(struct device *dev, struct device_attribute *attr, const char *buf,
	   size_t count)
{
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	struct nct7802_data *data = dev_get_drvdata(dev);
	unsigned long val;
	int err;

	err = kstrtoul(buf, 10, &val);
	if (err < 0)
		return err;
	if (val > 1)
		return -EINVAL;

	err = regmap_update_bits(data->regmap, sattr->nr, 1 << sattr->index,
				 val ? 1 << sattr->index : 0);
	return err ? : count;
}

static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0x01,
			    REG_TEMP_LSB);
static SENSOR_DEVICE_ATTR_2(temp1_min, S_IRUGO | S_IWUSR, show_temp,
			    store_temp, 0x31, 0);
static SENSOR_DEVICE_ATTR_2(temp1_max, S_IRUGO | S_IWUSR, show_temp,
			    store_temp, 0x30, 0);
static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IRUGO | S_IWUSR, show_temp,
			    store_temp, 0x3a, 0);

static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0x02,
			    REG_TEMP_LSB);
static SENSOR_DEVICE_ATTR_2(temp2_min, S_IRUGO | S_IWUSR, show_temp,
			    store_temp, 0x33, 0);
static SENSOR_DEVICE_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, show_temp,
			    store_temp, 0x32, 0);
static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IRUGO | S_IWUSR, show_temp,
			    store_temp, 0x3b, 0);

static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 0x03,
			    REG_TEMP_LSB);
static SENSOR_DEVICE_ATTR_2(temp3_min, S_IRUGO | S_IWUSR, show_temp,
			    store_temp, 0x35, 0);
static SENSOR_DEVICE_ATTR_2(temp3_max, S_IRUGO | S_IWUSR, show_temp,
			    store_temp, 0x34, 0);
static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IRUGO | S_IWUSR, show_temp,
			    store_temp, 0x3c, 0);

static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 0x04, 0);
static SENSOR_DEVICE_ATTR_2(temp4_min, S_IRUGO | S_IWUSR, show_temp,
			    store_temp, 0x37, 0);
static SENSOR_DEVICE_ATTR_2(temp4_max, S_IRUGO | S_IWUSR, show_temp,
			    store_temp, 0x36, 0);
static SENSOR_DEVICE_ATTR_2(temp4_crit, S_IRUGO | S_IWUSR, show_temp,
			    store_temp, 0x3d, 0);

static SENSOR_DEVICE_ATTR_2(temp5_input, S_IRUGO, show_temp, NULL, 0x06,
			    REG_TEMP_PECI_LSB);
static SENSOR_DEVICE_ATTR_2(temp5_min, S_IRUGO | S_IWUSR, show_temp,
			    store_temp, 0x39, 0);
static SENSOR_DEVICE_ATTR_2(temp5_max, S_IRUGO | S_IWUSR, show_temp,
			    store_temp, 0x38, 0);
static SENSOR_DEVICE_ATTR_2(temp5_crit, S_IRUGO | S_IWUSR, show_temp,
			    store_temp, 0x3e, 0);

static SENSOR_DEVICE_ATTR_2(temp6_input, S_IRUGO, show_temp, NULL, 0x07,
			    REG_TEMP_PECI_LSB);

static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO, show_alarm, NULL,
			    0x18, 0);
static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO, show_alarm, NULL,
			    0x18, 1);
static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO, show_alarm, NULL,
			    0x18, 2);
static SENSOR_DEVICE_ATTR_2(temp4_min_alarm, S_IRUGO, show_alarm, NULL,
			    0x18, 3);
static SENSOR_DEVICE_ATTR_2(temp5_min_alarm, S_IRUGO, show_alarm, NULL,
			    0x18, 4);

static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO, show_alarm, NULL,
			    0x19, 0);
static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO, show_alarm, NULL,
			    0x19, 1);
static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO, show_alarm, NULL,
			    0x19, 2);
static SENSOR_DEVICE_ATTR_2(temp4_max_alarm, S_IRUGO, show_alarm, NULL,
			    0x19, 3);
static SENSOR_DEVICE_ATTR_2(temp5_max_alarm, S_IRUGO, show_alarm, NULL,
			    0x19, 4);

static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO, show_alarm, NULL,
			    0x1b, 0);
static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO, show_alarm, NULL,
			    0x1b, 1);
static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO, show_alarm, NULL,
			    0x1b, 2);
static SENSOR_DEVICE_ATTR_2(temp4_crit_alarm, S_IRUGO, show_alarm, NULL,
			    0x1b, 3);
static SENSOR_DEVICE_ATTR_2(temp5_crit_alarm, S_IRUGO, show_alarm, NULL,
			    0x1b, 4);

static SENSOR_DEVICE_ATTR_2(temp1_fault, S_IRUGO, show_alarm, NULL, 0x17, 0);
static SENSOR_DEVICE_ATTR_2(temp2_fault, S_IRUGO, show_alarm, NULL, 0x17, 1);
static SENSOR_DEVICE_ATTR_2(temp3_fault, S_IRUGO, show_alarm, NULL, 0x17, 2);

static SENSOR_DEVICE_ATTR_2(temp1_beep, S_IRUGO | S_IWUSR, show_beep,
			    store_beep, 0x5c, 0);
static SENSOR_DEVICE_ATTR_2(temp2_beep, S_IRUGO | S_IWUSR, show_beep,
			    store_beep, 0x5c, 1);
static SENSOR_DEVICE_ATTR_2(temp3_beep, S_IRUGO | S_IWUSR, show_beep,
			    store_beep, 0x5c, 2);
static SENSOR_DEVICE_ATTR_2(temp4_beep, S_IRUGO | S_IWUSR, show_beep,
			    store_beep, 0x5c, 3);
static SENSOR_DEVICE_ATTR_2(temp5_beep, S_IRUGO | S_IWUSR, show_beep,
			    store_beep, 0x5c, 4);
static SENSOR_DEVICE_ATTR_2(temp6_beep, S_IRUGO | S_IWUSR, show_beep,
			    store_beep, 0x5c, 5);

static struct attribute *nct7802_temp_attrs[] = {
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp1_min.dev_attr.attr,
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_fault.dev_attr.attr,
	&sensor_dev_attr_temp1_beep.dev_attr.attr,

	&sensor_dev_attr_temp2_input.dev_attr.attr,		/* 9 */
	&sensor_dev_attr_temp2_min.dev_attr.attr,
	&sensor_dev_attr_temp2_max.dev_attr.attr,
	&sensor_dev_attr_temp2_crit.dev_attr.attr,
	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_fault.dev_attr.attr,
	&sensor_dev_attr_temp2_beep.dev_attr.attr,

	&sensor_dev_attr_temp3_input.dev_attr.attr,		/* 18 */
	&sensor_dev_attr_temp3_min.dev_attr.attr,
	&sensor_dev_attr_temp3_max.dev_attr.attr,
	&sensor_dev_attr_temp3_crit.dev_attr.attr,
	&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp3_fault.dev_attr.attr,
	&sensor_dev_attr_temp3_beep.dev_attr.attr,

	&sensor_dev_attr_temp4_input.dev_attr.attr,		/* 27 */
	&sensor_dev_attr_temp4_min.dev_attr.attr,
	&sensor_dev_attr_temp4_max.dev_attr.attr,
	&sensor_dev_attr_temp4_crit.dev_attr.attr,
	&sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp4_beep.dev_attr.attr,

	&sensor_dev_attr_temp5_input.dev_attr.attr,		/* 35 */
	&sensor_dev_attr_temp5_min.dev_attr.attr,
	&sensor_dev_attr_temp5_max.dev_attr.attr,
	&sensor_dev_attr_temp5_crit.dev_attr.attr,
	&sensor_dev_attr_temp5_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp5_beep.dev_attr.attr,

	&sensor_dev_attr_temp6_input.dev_attr.attr,		/* 43 */
	&sensor_dev_attr_temp6_beep.dev_attr.attr,

	NULL
};

static umode_t nct7802_temp_is_visible(struct kobject *kobj,
				       struct attribute *attr, int index)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct nct7802_data *data = dev_get_drvdata(dev);
	unsigned int reg;
	int err;

	err = regmap_read(data->regmap, REG_MODE, &reg);
	if (err < 0)
		return 0;

	if (index < 9 &&
	    (reg & 03) != 0x01 && (reg & 0x03) != 0x02)		/* RD1 */
		return 0;
	if (index >= 9 && index < 18 &&
	    (reg & 0x0c) != 0x04 && (reg & 0x0c) != 0x08)	/* RD2 */
		return 0;
	if (index >= 18 && index < 27 && (reg & 0x30) != 0x20)	/* RD3 */
		return 0;
	if (index >= 27 && index < 35)				/* local */
		return attr->mode;

	err = regmap_read(data->regmap, REG_PECI_ENABLE, &reg);
	if (err < 0)
		return 0;

	if (index >= 35 && index < 43 && !(reg & 0x01))		/* PECI 0 */
		return 0;

	if (index >= 0x43 && (!(reg & 0x02)))			/* PECI 1 */
		return 0;

	return attr->mode;
}

static struct attribute_group nct7802_temp_group = {
	.attrs = nct7802_temp_attrs,
	.is_visible = nct7802_temp_is_visible,
};

static SENSOR_DEVICE_ATTR_2(in0_input, S_IRUGO, show_in, NULL, 0, 0);
static SENSOR_DEVICE_ATTR_2(in0_min, S_IRUGO | S_IWUSR, show_in, store_in,
			    0, 1);
static SENSOR_DEVICE_ATTR_2(in0_max, S_IRUGO | S_IWUSR, show_in, store_in,
			    0, 2);
static SENSOR_DEVICE_ATTR_2(in0_alarm, S_IRUGO, show_alarm, NULL, 0x1e, 3);
static SENSOR_DEVICE_ATTR_2(in0_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,
			    0x5a, 3);

static SENSOR_DEVICE_ATTR_2(in1_input, S_IRUGO, show_in, NULL, 1, 0);

static SENSOR_DEVICE_ATTR_2(in2_input, S_IRUGO, show_in, NULL, 2, 0);
static SENSOR_DEVICE_ATTR_2(in2_min, S_IRUGO | S_IWUSR, show_in, store_in,
			    2, 1);
static SENSOR_DEVICE_ATTR_2(in2_max, S_IRUGO | S_IWUSR, show_in, store_in,
			    2, 2);
static SENSOR_DEVICE_ATTR_2(in2_alarm, S_IRUGO, show_alarm, NULL, 0x1e, 0);
static SENSOR_DEVICE_ATTR_2(in2_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,
			    0x5a, 0);

static SENSOR_DEVICE_ATTR_2(in3_input, S_IRUGO, show_in, NULL, 3, 0);
static SENSOR_DEVICE_ATTR_2(in3_min, S_IRUGO | S_IWUSR, show_in, store_in,
			    3, 1);
static SENSOR_DEVICE_ATTR_2(in3_max, S_IRUGO | S_IWUSR, show_in, store_in,
			    3, 2);
static SENSOR_DEVICE_ATTR_2(in3_alarm, S_IRUGO, show_alarm, NULL, 0x1e, 1);
static SENSOR_DEVICE_ATTR_2(in3_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,
			    0x5a, 1);

static SENSOR_DEVICE_ATTR_2(in4_input, S_IRUGO, show_in, NULL, 4, 0);
static SENSOR_DEVICE_ATTR_2(in4_min, S_IRUGO | S_IWUSR, show_in, store_in,
			    4, 1);
static SENSOR_DEVICE_ATTR_2(in4_max, S_IRUGO | S_IWUSR, show_in, store_in,
			    4, 2);
static SENSOR_DEVICE_ATTR_2(in4_alarm, S_IRUGO, show_alarm, NULL, 0x1e, 2);
static SENSOR_DEVICE_ATTR_2(in4_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,
			    0x5a, 2);

static struct attribute *nct7802_in_attrs[] = {
	&sensor_dev_attr_in0_input.dev_attr.attr,
	&sensor_dev_attr_in0_min.dev_attr.attr,
	&sensor_dev_attr_in0_max.dev_attr.attr,
	&sensor_dev_attr_in0_alarm.dev_attr.attr,
	&sensor_dev_attr_in0_beep.dev_attr.attr,

	&sensor_dev_attr_in1_input.dev_attr.attr,	/* 5 */

	&sensor_dev_attr_in2_input.dev_attr.attr,	/* 6 */
	&sensor_dev_attr_in2_min.dev_attr.attr,
	&sensor_dev_attr_in2_max.dev_attr.attr,
	&sensor_dev_attr_in2_alarm.dev_attr.attr,
	&sensor_dev_attr_in2_beep.dev_attr.attr,

	&sensor_dev_attr_in3_input.dev_attr.attr,	/* 11 */
	&sensor_dev_attr_in3_min.dev_attr.attr,
	&sensor_dev_attr_in3_max.dev_attr.attr,
	&sensor_dev_attr_in3_alarm.dev_attr.attr,
	&sensor_dev_attr_in3_beep.dev_attr.attr,

	&sensor_dev_attr_in4_input.dev_attr.attr,	/* 17 */
	&sensor_dev_attr_in4_min.dev_attr.attr,
	&sensor_dev_attr_in4_max.dev_attr.attr,
	&sensor_dev_attr_in4_alarm.dev_attr.attr,
	&sensor_dev_attr_in4_beep.dev_attr.attr,

	NULL,
};

static umode_t nct7802_in_is_visible(struct kobject *kobj,
				     struct attribute *attr, int index)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct nct7802_data *data = dev_get_drvdata(dev);
	unsigned int reg;
	int err;

	if (index < 6)						/* VCC, VCORE */
		return attr->mode;

	err = regmap_read(data->regmap, REG_MODE, &reg);
	if (err < 0)
		return 0;

	if (index >= 6 && index < 11 && (reg & 0x03) != 0x03)	/* VSEN1 */
		return 0;
	if (index >= 11 && index < 17 && (reg & 0x0c) != 0x0c)	/* VSEN2 */
		return 0;
	if (index >= 17 && (reg & 0x30) != 0x30)		/* VSEN3 */
		return 0;

	return attr->mode;
}

static struct attribute_group nct7802_in_group = {
	.attrs = nct7802_in_attrs,
	.is_visible = nct7802_in_is_visible,
};

static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0x10);
static SENSOR_DEVICE_ATTR_2(fan1_min, S_IRUGO | S_IWUSR, show_fan_min,
			    store_fan_min, 0x49, 0x4c);
static SENSOR_DEVICE_ATTR_2(fan1_alarm, S_IRUGO, show_alarm, NULL, 0x1a, 0);
static SENSOR_DEVICE_ATTR_2(fan1_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,
			    0x5b, 0);
static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 0x11);
static SENSOR_DEVICE_ATTR_2(fan2_min, S_IRUGO | S_IWUSR, show_fan_min,
			    store_fan_min, 0x4a, 0x4d);
static SENSOR_DEVICE_ATTR_2(fan2_alarm, S_IRUGO, show_alarm, NULL, 0x1a, 1);
static SENSOR_DEVICE_ATTR_2(fan2_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,
			    0x5b, 1);
static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 0x12);
static SENSOR_DEVICE_ATTR_2(fan3_min, S_IRUGO | S_IWUSR, show_fan_min,
			    store_fan_min, 0x4b, 0x4e);
static SENSOR_DEVICE_ATTR_2(fan3_alarm, S_IRUGO, show_alarm, NULL, 0x1a, 2);
static SENSOR_DEVICE_ATTR_2(fan3_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,
			    0x5b, 2);

static struct attribute *nct7802_fan_attrs[] = {
	&sensor_dev_attr_fan1_input.dev_attr.attr,
	&sensor_dev_attr_fan1_min.dev_attr.attr,
	&sensor_dev_attr_fan1_alarm.dev_attr.attr,
	&sensor_dev_attr_fan1_beep.dev_attr.attr,
	&sensor_dev_attr_fan2_input.dev_attr.attr,
	&sensor_dev_attr_fan2_min.dev_attr.attr,
	&sensor_dev_attr_fan2_alarm.dev_attr.attr,
	&sensor_dev_attr_fan2_beep.dev_attr.attr,
	&sensor_dev_attr_fan3_input.dev_attr.attr,
	&sensor_dev_attr_fan3_min.dev_attr.attr,
	&sensor_dev_attr_fan3_alarm.dev_attr.attr,
	&sensor_dev_attr_fan3_beep.dev_attr.attr,

	NULL
};

static umode_t nct7802_fan_is_visible(struct kobject *kobj,
				      struct attribute *attr, int index)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct nct7802_data *data = dev_get_drvdata(dev);
	int fan = index / 4;	/* 4 attributes per fan */
	unsigned int reg;
	int err;

	err = regmap_read(data->regmap, REG_FAN_ENABLE, &reg);
	if (err < 0 || !(reg & (1 << fan)))
		return 0;

	return attr->mode;
}

static struct attribute_group nct7802_fan_group = {
	.attrs = nct7802_fan_attrs,
	.is_visible = nct7802_fan_is_visible,
};

static const struct attribute_group *nct7802_groups[] = {
	&nct7802_temp_group,
	&nct7802_in_group,
	&nct7802_fan_group,
	NULL
};

static int nct7802_detect(struct i2c_client *client,
			  struct i2c_board_info *info)
{
	int reg;

	/*
	 * Chip identification registers are only available in bank 0,
	 * so only attempt chip detection if bank 0 is selected
	 */
	reg = i2c_smbus_read_byte_data(client, REG_BANK);
	if (reg != 0x00)
		return -ENODEV;

	reg = i2c_smbus_read_byte_data(client, REG_VENDOR_ID);
	if (reg != 0x50)
		return -ENODEV;

	reg = i2c_smbus_read_byte_data(client, REG_CHIP_ID);
	if (reg != 0xc3)
		return -ENODEV;

	reg = i2c_smbus_read_byte_data(client, REG_VERSION_ID);
	if (reg < 0 || (reg & 0xf0) != 0x20)
		return -ENODEV;

	/* Also validate lower bits of voltage and temperature registers */
	reg = i2c_smbus_read_byte_data(client, REG_TEMP_LSB);
	if (reg < 0 || (reg & 0x1f))
		return -ENODEV;

	reg = i2c_smbus_read_byte_data(client, REG_TEMP_PECI_LSB);
	if (reg < 0 || (reg & 0x3f))
		return -ENODEV;

	reg = i2c_smbus_read_byte_data(client, REG_VOLTAGE_LOW);
	if (reg < 0 || (reg & 0x3f))
		return -ENODEV;

	strlcpy(info->type, "nct7802", I2C_NAME_SIZE);
	return 0;
}

static bool nct7802_regmap_is_volatile(struct device *dev, unsigned int reg)
{
	return reg != REG_BANK && reg <= 0x20;
}

static const struct regmap_config nct7802_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.cache_type = REGCACHE_RBTREE,
	.volatile_reg = nct7802_regmap_is_volatile,
};

static int nct7802_init_chip(struct nct7802_data *data)
{
	int err;

	/* Enable ADC */
	err = regmap_update_bits(data->regmap, REG_START, 0x01, 0x01);
	if (err)
		return err;

	/* Enable local temperature sensor */
	err = regmap_update_bits(data->regmap, REG_MODE, 0x40, 0x40);
	if (err)
		return err;

	/* Enable Vcore and VCC voltage monitoring */
	return regmap_update_bits(data->regmap, REG_VMON_ENABLE, 0x03, 0x03);
}

static int nct7802_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	struct nct7802_data *data;
	struct device *hwmon_dev;
	int ret;

	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
	if (data == NULL)
		return -ENOMEM;

	data->regmap = devm_regmap_init_i2c(client, &nct7802_regmap_config);
	if (IS_ERR(data->regmap))
		return PTR_ERR(data->regmap);

	mutex_init(&data->access_lock);

	ret = nct7802_init_chip(data);
	if (ret < 0)
		return ret;

	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
							   data,
							   nct7802_groups);
	return PTR_ERR_OR_ZERO(hwmon_dev);
}

static const unsigned short nct7802_address_list[] = {
	0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END
};

static const struct i2c_device_id nct7802_idtable[] = {
	{ "nct7802", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, nct7802_idtable);

static struct i2c_driver nct7802_driver = {
	.class = I2C_CLASS_HWMON,
	.driver = {
		.name = DRVNAME,
	},
	.detect = nct7802_detect,
	.probe = nct7802_probe,
	.id_table = nct7802_idtable,
	.address_list = nct7802_address_list,
};

module_i2c_driver(nct7802_driver);

MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
MODULE_DESCRIPTION("NCT7802Y Hardware Monitoring Driver");
MODULE_LICENSE("GPL v2");