summaryrefslogtreecommitdiff
path: root/drivers/hwmon/max16065.c
blob: 49b7e0b6d1bbe909d83ce8a0664662eaa07fae5d (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Driver for
 *  Maxim MAX16065/MAX16066 12-Channel/8-Channel, Flash-Configurable
 *  System Managers with Nonvolatile Fault Registers
 *  Maxim MAX16067/MAX16068 6-Channel, Flash-Configurable System Managers
 *  with Nonvolatile Fault Registers
 *  Maxim MAX16070/MAX16071 12-Channel/8-Channel, Flash-Configurable System
 *  Monitors with Nonvolatile Fault Registers
 *
 * Copyright (C) 2011 Ericsson AB.
 */

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

enum chips { max16065, max16066, max16067, max16068, max16070, max16071 };

/*
 * Registers
 */
#define MAX16065_ADC(x)		((x) * 2)

#define MAX16065_CURR_SENSE	0x18
#define MAX16065_CSP_ADC	0x19
#define MAX16065_FAULT(x)	(0x1b + (x))
#define MAX16065_SCALE(x)	(0x43 + (x))
#define MAX16065_CURR_CONTROL	0x47
#define MAX16065_LIMIT(l, x)	(0x48 + (l) + (x) * 3)	/*
							 * l: limit
							 *  0: min/max
							 *  1: crit
							 *  2: lcrit
							 * x: ADC index
							 */

#define MAX16065_SW_ENABLE	0x73

#define MAX16065_WARNING_OV	(1 << 3) /* Set if secondary threshold is OV
					    warning */

#define MAX16065_CURR_ENABLE	(1 << 0)

#define MAX16065_NUM_LIMIT	3
#define MAX16065_NUM_ADC	12	/* maximum number of ADC channels */

static const int max16065_num_adc[] = {
	[max16065] = 12,
	[max16066] = 8,
	[max16067] = 6,
	[max16068] = 6,
	[max16070] = 12,
	[max16071] = 8,
};

static const bool max16065_have_secondary[] = {
	[max16065] = true,
	[max16066] = true,
	[max16067] = false,
	[max16068] = false,
	[max16070] = true,
	[max16071] = true,
};

static const bool max16065_have_current[] = {
	[max16065] = true,
	[max16066] = true,
	[max16067] = false,
	[max16068] = false,
	[max16070] = true,
	[max16071] = true,
};

struct max16065_data {
	enum chips type;
	struct i2c_client *client;
	const struct attribute_group *groups[4];
	struct mutex update_lock;
	bool valid;
	unsigned long last_updated; /* in jiffies */
	int num_adc;
	bool have_current;
	int curr_gain;
	/* limits are in mV */
	int limit[MAX16065_NUM_LIMIT][MAX16065_NUM_ADC];
	int range[MAX16065_NUM_ADC + 1];/* voltage range */
	int adc[MAX16065_NUM_ADC + 1];	/* adc values (raw) including csp_adc */
	int curr_sense;
	int fault[2];
};

static const int max16065_adc_range[] = { 5560, 2780, 1390, 0 };
static const int max16065_csp_adc_range[] = { 7000, 14000 };

/* ADC registers have 10 bit resolution. */
static inline int ADC_TO_MV(int adc, int range)
{
	return (adc * range) / 1024;
}

/*
 * Limit registers have 8 bit resolution and match upper 8 bits of ADC
 * registers.
 */
static inline int LIMIT_TO_MV(int limit, int range)
{
	return limit * range / 256;
}

static inline int MV_TO_LIMIT(int mv, int range)
{
	return clamp_val(DIV_ROUND_CLOSEST(mv * 256, range), 0, 255);
}

static inline int ADC_TO_CURR(int adc, int gain)
{
	return adc * 1400000 / (gain * 255);
}

/*
 * max16065_read_adc()
 *
 * Read 16 bit value from <reg>, <reg+1>.
 * Upper 8 bits are in <reg>, lower 2 bits are in bits 7:6 of <reg+1>.
 */
static int max16065_read_adc(struct i2c_client *client, int reg)
{
	int rv;

	rv = i2c_smbus_read_word_swapped(client, reg);
	if (unlikely(rv < 0))
		return rv;
	return rv >> 6;
}

static struct max16065_data *max16065_update_device(struct device *dev)
{
	struct max16065_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;

	mutex_lock(&data->update_lock);
	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
		int i;

		for (i = 0; i < data->num_adc; i++)
			data->adc[i]
			  = max16065_read_adc(client, MAX16065_ADC(i));

		if (data->have_current) {
			data->adc[MAX16065_NUM_ADC]
			  = max16065_read_adc(client, MAX16065_CSP_ADC);
			data->curr_sense
			  = i2c_smbus_read_byte_data(client,
						     MAX16065_CURR_SENSE);
		}

		for (i = 0; i < DIV_ROUND_UP(data->num_adc, 8); i++)
			data->fault[i]
			  = i2c_smbus_read_byte_data(client, MAX16065_FAULT(i));

		data->last_updated = jiffies;
		data->valid = 1;
	}
	mutex_unlock(&data->update_lock);
	return data;
}

static ssize_t max16065_alarm_show(struct device *dev,
				   struct device_attribute *da, char *buf)
{
	struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da);
	struct max16065_data *data = max16065_update_device(dev);
	int val = data->fault[attr2->nr];

	if (val < 0)
		return val;

	val &= (1 << attr2->index);
	if (val)
		i2c_smbus_write_byte_data(data->client,
					  MAX16065_FAULT(attr2->nr), val);

	return snprintf(buf, PAGE_SIZE, "%d\n", !!val);
}

static ssize_t max16065_input_show(struct device *dev,
				   struct device_attribute *da, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct max16065_data *data = max16065_update_device(dev);
	int adc = data->adc[attr->index];

	if (unlikely(adc < 0))
		return adc;

	return snprintf(buf, PAGE_SIZE, "%d\n",
			ADC_TO_MV(adc, data->range[attr->index]));
}

static ssize_t max16065_current_show(struct device *dev,
				     struct device_attribute *da, char *buf)
{
	struct max16065_data *data = max16065_update_device(dev);

	if (unlikely(data->curr_sense < 0))
		return data->curr_sense;

	return snprintf(buf, PAGE_SIZE, "%d\n",
			ADC_TO_CURR(data->curr_sense, data->curr_gain));
}

static ssize_t max16065_limit_store(struct device *dev,
				    struct device_attribute *da,
				    const char *buf, size_t count)
{
	struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da);
	struct max16065_data *data = dev_get_drvdata(dev);
	unsigned long val;
	int err;
	int limit;

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

	limit = MV_TO_LIMIT(val, data->range[attr2->index]);

	mutex_lock(&data->update_lock);
	data->limit[attr2->nr][attr2->index]
	  = LIMIT_TO_MV(limit, data->range[attr2->index]);
	i2c_smbus_write_byte_data(data->client,
				  MAX16065_LIMIT(attr2->nr, attr2->index),
				  limit);
	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t max16065_limit_show(struct device *dev,
				   struct device_attribute *da, char *buf)
{
	struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da);
	struct max16065_data *data = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE, "%d\n",
			data->limit[attr2->nr][attr2->index]);
}

/* Construct a sensor_device_attribute structure for each register */

/* Input voltages */
static SENSOR_DEVICE_ATTR_RO(in0_input, max16065_input, 0);
static SENSOR_DEVICE_ATTR_RO(in1_input, max16065_input, 1);
static SENSOR_DEVICE_ATTR_RO(in2_input, max16065_input, 2);
static SENSOR_DEVICE_ATTR_RO(in3_input, max16065_input, 3);
static SENSOR_DEVICE_ATTR_RO(in4_input, max16065_input, 4);
static SENSOR_DEVICE_ATTR_RO(in5_input, max16065_input, 5);
static SENSOR_DEVICE_ATTR_RO(in6_input, max16065_input, 6);
static SENSOR_DEVICE_ATTR_RO(in7_input, max16065_input, 7);
static SENSOR_DEVICE_ATTR_RO(in8_input, max16065_input, 8);
static SENSOR_DEVICE_ATTR_RO(in9_input, max16065_input, 9);
static SENSOR_DEVICE_ATTR_RO(in10_input, max16065_input, 10);
static SENSOR_DEVICE_ATTR_RO(in11_input, max16065_input, 11);
static SENSOR_DEVICE_ATTR_RO(in12_input, max16065_input, 12);

/* Input voltages lcrit */
static SENSOR_DEVICE_ATTR_2_RW(in0_lcrit, max16065_limit, 2, 0);
static SENSOR_DEVICE_ATTR_2_RW(in1_lcrit, max16065_limit, 2, 1);
static SENSOR_DEVICE_ATTR_2_RW(in2_lcrit, max16065_limit, 2, 2);
static SENSOR_DEVICE_ATTR_2_RW(in3_lcrit, max16065_limit, 2, 3);
static SENSOR_DEVICE_ATTR_2_RW(in4_lcrit, max16065_limit, 2, 4);
static SENSOR_DEVICE_ATTR_2_RW(in5_lcrit, max16065_limit, 2, 5);
static SENSOR_DEVICE_ATTR_2_RW(in6_lcrit, max16065_limit, 2, 6);
static SENSOR_DEVICE_ATTR_2_RW(in7_lcrit, max16065_limit, 2, 7);
static SENSOR_DEVICE_ATTR_2_RW(in8_lcrit, max16065_limit, 2, 8);
static SENSOR_DEVICE_ATTR_2_RW(in9_lcrit, max16065_limit, 2, 9);
static SENSOR_DEVICE_ATTR_2_RW(in10_lcrit, max16065_limit, 2, 10);
static SENSOR_DEVICE_ATTR_2_RW(in11_lcrit, max16065_limit, 2, 11);

/* Input voltages crit */
static SENSOR_DEVICE_ATTR_2_RW(in0_crit, max16065_limit, 1, 0);
static SENSOR_DEVICE_ATTR_2_RW(in1_crit, max16065_limit, 1, 1);
static SENSOR_DEVICE_ATTR_2_RW(in2_crit, max16065_limit, 1, 2);
static SENSOR_DEVICE_ATTR_2_RW(in3_crit, max16065_limit, 1, 3);
static SENSOR_DEVICE_ATTR_2_RW(in4_crit, max16065_limit, 1, 4);
static SENSOR_DEVICE_ATTR_2_RW(in5_crit, max16065_limit, 1, 5);
static SENSOR_DEVICE_ATTR_2_RW(in6_crit, max16065_limit, 1, 6);
static SENSOR_DEVICE_ATTR_2_RW(in7_crit, max16065_limit, 1, 7);
static SENSOR_DEVICE_ATTR_2_RW(in8_crit, max16065_limit, 1, 8);
static SENSOR_DEVICE_ATTR_2_RW(in9_crit, max16065_limit, 1, 9);
static SENSOR_DEVICE_ATTR_2_RW(in10_crit, max16065_limit, 1, 10);
static SENSOR_DEVICE_ATTR_2_RW(in11_crit, max16065_limit, 1, 11);

/* Input voltages min */
static SENSOR_DEVICE_ATTR_2_RW(in0_min, max16065_limit, 0, 0);
static SENSOR_DEVICE_ATTR_2_RW(in1_min, max16065_limit, 0, 1);
static SENSOR_DEVICE_ATTR_2_RW(in2_min, max16065_limit, 0, 2);
static SENSOR_DEVICE_ATTR_2_RW(in3_min, max16065_limit, 0, 3);
static SENSOR_DEVICE_ATTR_2_RW(in4_min, max16065_limit, 0, 4);
static SENSOR_DEVICE_ATTR_2_RW(in5_min, max16065_limit, 0, 5);
static SENSOR_DEVICE_ATTR_2_RW(in6_min, max16065_limit, 0, 6);
static SENSOR_DEVICE_ATTR_2_RW(in7_min, max16065_limit, 0, 7);
static SENSOR_DEVICE_ATTR_2_RW(in8_min, max16065_limit, 0, 8);
static SENSOR_DEVICE_ATTR_2_RW(in9_min, max16065_limit, 0, 9);
static SENSOR_DEVICE_ATTR_2_RW(in10_min, max16065_limit, 0, 10);
static SENSOR_DEVICE_ATTR_2_RW(in11_min, max16065_limit, 0, 11);

/* Input voltages max */
static SENSOR_DEVICE_ATTR_2_RW(in0_max, max16065_limit, 0, 0);
static SENSOR_DEVICE_ATTR_2_RW(in1_max, max16065_limit, 0, 1);
static SENSOR_DEVICE_ATTR_2_RW(in2_max, max16065_limit, 0, 2);
static SENSOR_DEVICE_ATTR_2_RW(in3_max, max16065_limit, 0, 3);
static SENSOR_DEVICE_ATTR_2_RW(in4_max, max16065_limit, 0, 4);
static SENSOR_DEVICE_ATTR_2_RW(in5_max, max16065_limit, 0, 5);
static SENSOR_DEVICE_ATTR_2_RW(in6_max, max16065_limit, 0, 6);
static SENSOR_DEVICE_ATTR_2_RW(in7_max, max16065_limit, 0, 7);
static SENSOR_DEVICE_ATTR_2_RW(in8_max, max16065_limit, 0, 8);
static SENSOR_DEVICE_ATTR_2_RW(in9_max, max16065_limit, 0, 9);
static SENSOR_DEVICE_ATTR_2_RW(in10_max, max16065_limit, 0, 10);
static SENSOR_DEVICE_ATTR_2_RW(in11_max, max16065_limit, 0, 11);

/* alarms */
static SENSOR_DEVICE_ATTR_2_RO(in0_alarm, max16065_alarm, 0, 0);
static SENSOR_DEVICE_ATTR_2_RO(in1_alarm, max16065_alarm, 0, 1);
static SENSOR_DEVICE_ATTR_2_RO(in2_alarm, max16065_alarm, 0, 2);
static SENSOR_DEVICE_ATTR_2_RO(in3_alarm, max16065_alarm, 0, 3);
static SENSOR_DEVICE_ATTR_2_RO(in4_alarm, max16065_alarm, 0, 4);
static SENSOR_DEVICE_ATTR_2_RO(in5_alarm, max16065_alarm, 0, 5);
static SENSOR_DEVICE_ATTR_2_RO(in6_alarm, max16065_alarm, 0, 6);
static SENSOR_DEVICE_ATTR_2_RO(in7_alarm, max16065_alarm, 0, 7);
static SENSOR_DEVICE_ATTR_2_RO(in8_alarm, max16065_alarm, 1, 0);
static SENSOR_DEVICE_ATTR_2_RO(in9_alarm, max16065_alarm, 1, 1);
static SENSOR_DEVICE_ATTR_2_RO(in10_alarm, max16065_alarm, 1, 2);
static SENSOR_DEVICE_ATTR_2_RO(in11_alarm, max16065_alarm, 1, 3);

/* Current and alarm */
static SENSOR_DEVICE_ATTR_RO(curr1_input, max16065_current, 0);
static SENSOR_DEVICE_ATTR_2_RO(curr1_alarm, max16065_alarm, 1, 4);

/*
 * Finally, construct an array of pointers to members of the above objects,
 * as required for sysfs_create_group()
 */
static struct attribute *max16065_basic_attributes[] = {
	&sensor_dev_attr_in0_input.dev_attr.attr,
	&sensor_dev_attr_in0_lcrit.dev_attr.attr,
	&sensor_dev_attr_in0_crit.dev_attr.attr,
	&sensor_dev_attr_in0_alarm.dev_attr.attr,

	&sensor_dev_attr_in1_input.dev_attr.attr,
	&sensor_dev_attr_in1_lcrit.dev_attr.attr,
	&sensor_dev_attr_in1_crit.dev_attr.attr,
	&sensor_dev_attr_in1_alarm.dev_attr.attr,

	&sensor_dev_attr_in2_input.dev_attr.attr,
	&sensor_dev_attr_in2_lcrit.dev_attr.attr,
	&sensor_dev_attr_in2_crit.dev_attr.attr,
	&sensor_dev_attr_in2_alarm.dev_attr.attr,

	&sensor_dev_attr_in3_input.dev_attr.attr,
	&sensor_dev_attr_in3_lcrit.dev_attr.attr,
	&sensor_dev_attr_in3_crit.dev_attr.attr,
	&sensor_dev_attr_in3_alarm.dev_attr.attr,

	&sensor_dev_attr_in4_input.dev_attr.attr,
	&sensor_dev_attr_in4_lcrit.dev_attr.attr,
	&sensor_dev_attr_in4_crit.dev_attr.attr,
	&sensor_dev_attr_in4_alarm.dev_attr.attr,

	&sensor_dev_attr_in5_input.dev_attr.attr,
	&sensor_dev_attr_in5_lcrit.dev_attr.attr,
	&sensor_dev_attr_in5_crit.dev_attr.attr,
	&sensor_dev_attr_in5_alarm.dev_attr.attr,

	&sensor_dev_attr_in6_input.dev_attr.attr,
	&sensor_dev_attr_in6_lcrit.dev_attr.attr,
	&sensor_dev_attr_in6_crit.dev_attr.attr,
	&sensor_dev_attr_in6_alarm.dev_attr.attr,

	&sensor_dev_attr_in7_input.dev_attr.attr,
	&sensor_dev_attr_in7_lcrit.dev_attr.attr,
	&sensor_dev_attr_in7_crit.dev_attr.attr,
	&sensor_dev_attr_in7_alarm.dev_attr.attr,

	&sensor_dev_attr_in8_input.dev_attr.attr,
	&sensor_dev_attr_in8_lcrit.dev_attr.attr,
	&sensor_dev_attr_in8_crit.dev_attr.attr,
	&sensor_dev_attr_in8_alarm.dev_attr.attr,

	&sensor_dev_attr_in9_input.dev_attr.attr,
	&sensor_dev_attr_in9_lcrit.dev_attr.attr,
	&sensor_dev_attr_in9_crit.dev_attr.attr,
	&sensor_dev_attr_in9_alarm.dev_attr.attr,

	&sensor_dev_attr_in10_input.dev_attr.attr,
	&sensor_dev_attr_in10_lcrit.dev_attr.attr,
	&sensor_dev_attr_in10_crit.dev_attr.attr,
	&sensor_dev_attr_in10_alarm.dev_attr.attr,

	&sensor_dev_attr_in11_input.dev_attr.attr,
	&sensor_dev_attr_in11_lcrit.dev_attr.attr,
	&sensor_dev_attr_in11_crit.dev_attr.attr,
	&sensor_dev_attr_in11_alarm.dev_attr.attr,

	NULL
};

static struct attribute *max16065_current_attributes[] = {
	&sensor_dev_attr_in12_input.dev_attr.attr,
	&sensor_dev_attr_curr1_input.dev_attr.attr,
	&sensor_dev_attr_curr1_alarm.dev_attr.attr,
	NULL
};

static struct attribute *max16065_min_attributes[] = {
	&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_in4_min.dev_attr.attr,
	&sensor_dev_attr_in5_min.dev_attr.attr,
	&sensor_dev_attr_in6_min.dev_attr.attr,
	&sensor_dev_attr_in7_min.dev_attr.attr,
	&sensor_dev_attr_in8_min.dev_attr.attr,
	&sensor_dev_attr_in9_min.dev_attr.attr,
	&sensor_dev_attr_in10_min.dev_attr.attr,
	&sensor_dev_attr_in11_min.dev_attr.attr,
	NULL
};

static struct attribute *max16065_max_attributes[] = {
	&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_in4_max.dev_attr.attr,
	&sensor_dev_attr_in5_max.dev_attr.attr,
	&sensor_dev_attr_in6_max.dev_attr.attr,
	&sensor_dev_attr_in7_max.dev_attr.attr,
	&sensor_dev_attr_in8_max.dev_attr.attr,
	&sensor_dev_attr_in9_max.dev_attr.attr,
	&sensor_dev_attr_in10_max.dev_attr.attr,
	&sensor_dev_attr_in11_max.dev_attr.attr,
	NULL
};

static umode_t max16065_basic_is_visible(struct kobject *kobj,
					 struct attribute *a, int n)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct max16065_data *data = dev_get_drvdata(dev);
	int index = n / 4;

	if (index >= data->num_adc || !data->range[index])
		return 0;
	return a->mode;
}

static umode_t max16065_secondary_is_visible(struct kobject *kobj,
					     struct attribute *a, int index)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct max16065_data *data = dev_get_drvdata(dev);

	if (index >= data->num_adc)
		return 0;
	return a->mode;
}

static const struct attribute_group max16065_basic_group = {
	.attrs = max16065_basic_attributes,
	.is_visible = max16065_basic_is_visible,
};

static const struct attribute_group max16065_current_group = {
	.attrs = max16065_current_attributes,
};

static const struct attribute_group max16065_min_group = {
	.attrs = max16065_min_attributes,
	.is_visible = max16065_secondary_is_visible,
};

static const struct attribute_group max16065_max_group = {
	.attrs = max16065_max_attributes,
	.is_visible = max16065_secondary_is_visible,
};

static int max16065_probe(struct i2c_client *client,
			  const struct i2c_device_id *id)
{
	struct i2c_adapter *adapter = client->adapter;
	struct max16065_data *data;
	struct device *dev = &client->dev;
	struct device *hwmon_dev;
	int i, j, val;
	bool have_secondary;		/* true if chip has secondary limits */
	bool secondary_is_max = false;	/* secondary limits reflect max */
	int groups = 0;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
				     | I2C_FUNC_SMBUS_READ_WORD_DATA))
		return -ENODEV;

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

	data->client = client;
	mutex_init(&data->update_lock);

	data->num_adc = max16065_num_adc[id->driver_data];
	data->have_current = max16065_have_current[id->driver_data];
	have_secondary = max16065_have_secondary[id->driver_data];

	if (have_secondary) {
		val = i2c_smbus_read_byte_data(client, MAX16065_SW_ENABLE);
		if (unlikely(val < 0))
			return val;
		secondary_is_max = val & MAX16065_WARNING_OV;
	}

	/* Read scale registers, convert to range */
	for (i = 0; i < DIV_ROUND_UP(data->num_adc, 4); i++) {
		val = i2c_smbus_read_byte_data(client, MAX16065_SCALE(i));
		if (unlikely(val < 0))
			return val;
		for (j = 0; j < 4 && i * 4 + j < data->num_adc; j++) {
			data->range[i * 4 + j] =
			  max16065_adc_range[(val >> (j * 2)) & 0x3];
		}
	}

	/* Read limits */
	for (i = 0; i < MAX16065_NUM_LIMIT; i++) {
		if (i == 0 && !have_secondary)
			continue;

		for (j = 0; j < data->num_adc; j++) {
			val = i2c_smbus_read_byte_data(client,
						       MAX16065_LIMIT(i, j));
			if (unlikely(val < 0))
				return val;
			data->limit[i][j] = LIMIT_TO_MV(val, data->range[j]);
		}
	}

	/* sysfs hooks */
	data->groups[groups++] = &max16065_basic_group;
	if (have_secondary)
		data->groups[groups++] = secondary_is_max ?
			&max16065_max_group : &max16065_min_group;

	if (data->have_current) {
		val = i2c_smbus_read_byte_data(client, MAX16065_CURR_CONTROL);
		if (unlikely(val < 0))
			return val;
		if (val & MAX16065_CURR_ENABLE) {
			/*
			 * Current gain is 6, 12, 24, 48 based on values in
			 * bit 2,3.
			 */
			data->curr_gain = 6 << ((val >> 2) & 0x03);
			data->range[MAX16065_NUM_ADC]
			  = max16065_csp_adc_range[(val >> 1) & 0x01];
			data->groups[groups++] = &max16065_current_group;
		} else {
			data->have_current = false;
		}
	}

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

static const struct i2c_device_id max16065_id[] = {
	{ "max16065", max16065 },
	{ "max16066", max16066 },
	{ "max16067", max16067 },
	{ "max16068", max16068 },
	{ "max16070", max16070 },
	{ "max16071", max16071 },
	{ }
};

MODULE_DEVICE_TABLE(i2c, max16065_id);

/* This is the driver that will be inserted */
static struct i2c_driver max16065_driver = {
	.driver = {
		.name = "max16065",
	},
	.probe = max16065_probe,
	.id_table = max16065_id,
};

module_i2c_driver(max16065_driver);

MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
MODULE_DESCRIPTION("MAX16065 driver");
MODULE_LICENSE("GPL");