xref: /openbmc/linux/drivers/hwmon/max16065.c (revision 1975d167)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Driver for
4  *  Maxim MAX16065/MAX16066 12-Channel/8-Channel, Flash-Configurable
5  *  System Managers with Nonvolatile Fault Registers
6  *  Maxim MAX16067/MAX16068 6-Channel, Flash-Configurable System Managers
7  *  with Nonvolatile Fault Registers
8  *  Maxim MAX16070/MAX16071 12-Channel/8-Channel, Flash-Configurable System
9  *  Monitors with Nonvolatile Fault Registers
10  *
11  * Copyright (C) 2011 Ericsson AB.
12  */
13 
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/err.h>
18 #include <linux/slab.h>
19 #include <linux/i2c.h>
20 #include <linux/hwmon.h>
21 #include <linux/hwmon-sysfs.h>
22 #include <linux/jiffies.h>
23 
24 enum chips { max16065, max16066, max16067, max16068, max16070, max16071 };
25 
26 /*
27  * Registers
28  */
29 #define MAX16065_ADC(x)		((x) * 2)
30 
31 #define MAX16065_CURR_SENSE	0x18
32 #define MAX16065_CSP_ADC	0x19
33 #define MAX16065_FAULT(x)	(0x1b + (x))
34 #define MAX16065_SCALE(x)	(0x43 + (x))
35 #define MAX16065_CURR_CONTROL	0x47
36 #define MAX16065_LIMIT(l, x)	(0x48 + (l) + (x) * 3)	/*
37 							 * l: limit
38 							 *  0: min/max
39 							 *  1: crit
40 							 *  2: lcrit
41 							 * x: ADC index
42 							 */
43 
44 #define MAX16065_SW_ENABLE	0x73
45 
46 #define MAX16065_WARNING_OV	(1 << 3) /* Set if secondary threshold is OV
47 					    warning */
48 
49 #define MAX16065_CURR_ENABLE	(1 << 0)
50 
51 #define MAX16065_NUM_LIMIT	3
52 #define MAX16065_NUM_ADC	12	/* maximum number of ADC channels */
53 
54 static const int max16065_num_adc[] = {
55 	[max16065] = 12,
56 	[max16066] = 8,
57 	[max16067] = 6,
58 	[max16068] = 6,
59 	[max16070] = 12,
60 	[max16071] = 8,
61 };
62 
63 static const bool max16065_have_secondary[] = {
64 	[max16065] = true,
65 	[max16066] = true,
66 	[max16067] = false,
67 	[max16068] = false,
68 	[max16070] = true,
69 	[max16071] = true,
70 };
71 
72 static const bool max16065_have_current[] = {
73 	[max16065] = true,
74 	[max16066] = true,
75 	[max16067] = false,
76 	[max16068] = false,
77 	[max16070] = true,
78 	[max16071] = true,
79 };
80 
81 struct max16065_data {
82 	enum chips type;
83 	struct i2c_client *client;
84 	const struct attribute_group *groups[4];
85 	struct mutex update_lock;
86 	bool valid;
87 	unsigned long last_updated; /* in jiffies */
88 	int num_adc;
89 	bool have_current;
90 	int curr_gain;
91 	/* limits are in mV */
92 	int limit[MAX16065_NUM_LIMIT][MAX16065_NUM_ADC];
93 	int range[MAX16065_NUM_ADC + 1];/* voltage range */
94 	int adc[MAX16065_NUM_ADC + 1];	/* adc values (raw) including csp_adc */
95 	int curr_sense;
96 	int fault[2];
97 };
98 
99 static const int max16065_adc_range[] = { 5560, 2780, 1390, 0 };
100 static const int max16065_csp_adc_range[] = { 7000, 14000 };
101 
102 /* ADC registers have 10 bit resolution. */
103 static inline int ADC_TO_MV(int adc, int range)
104 {
105 	return (adc * range) / 1024;
106 }
107 
108 /*
109  * Limit registers have 8 bit resolution and match upper 8 bits of ADC
110  * registers.
111  */
112 static inline int LIMIT_TO_MV(int limit, int range)
113 {
114 	return limit * range / 256;
115 }
116 
117 static inline int MV_TO_LIMIT(int mv, int range)
118 {
119 	return clamp_val(DIV_ROUND_CLOSEST(mv * 256, range), 0, 255);
120 }
121 
122 static inline int ADC_TO_CURR(int adc, int gain)
123 {
124 	return adc * 1400000 / (gain * 255);
125 }
126 
127 /*
128  * max16065_read_adc()
129  *
130  * Read 16 bit value from <reg>, <reg+1>.
131  * Upper 8 bits are in <reg>, lower 2 bits are in bits 7:6 of <reg+1>.
132  */
133 static int max16065_read_adc(struct i2c_client *client, int reg)
134 {
135 	int rv;
136 
137 	rv = i2c_smbus_read_word_swapped(client, reg);
138 	if (unlikely(rv < 0))
139 		return rv;
140 	return rv >> 6;
141 }
142 
143 static struct max16065_data *max16065_update_device(struct device *dev)
144 {
145 	struct max16065_data *data = dev_get_drvdata(dev);
146 	struct i2c_client *client = data->client;
147 
148 	mutex_lock(&data->update_lock);
149 	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
150 		int i;
151 
152 		for (i = 0; i < data->num_adc; i++)
153 			data->adc[i]
154 			  = max16065_read_adc(client, MAX16065_ADC(i));
155 
156 		if (data->have_current) {
157 			data->adc[MAX16065_NUM_ADC]
158 			  = max16065_read_adc(client, MAX16065_CSP_ADC);
159 			data->curr_sense
160 			  = i2c_smbus_read_byte_data(client,
161 						     MAX16065_CURR_SENSE);
162 		}
163 
164 		for (i = 0; i < DIV_ROUND_UP(data->num_adc, 8); i++)
165 			data->fault[i]
166 			  = i2c_smbus_read_byte_data(client, MAX16065_FAULT(i));
167 
168 		data->last_updated = jiffies;
169 		data->valid = true;
170 	}
171 	mutex_unlock(&data->update_lock);
172 	return data;
173 }
174 
175 static ssize_t max16065_alarm_show(struct device *dev,
176 				   struct device_attribute *da, char *buf)
177 {
178 	struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da);
179 	struct max16065_data *data = max16065_update_device(dev);
180 	int val = data->fault[attr2->nr];
181 
182 	if (val < 0)
183 		return val;
184 
185 	val &= (1 << attr2->index);
186 	if (val)
187 		i2c_smbus_write_byte_data(data->client,
188 					  MAX16065_FAULT(attr2->nr), val);
189 
190 	return sysfs_emit(buf, "%d\n", !!val);
191 }
192 
193 static ssize_t max16065_input_show(struct device *dev,
194 				   struct device_attribute *da, char *buf)
195 {
196 	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
197 	struct max16065_data *data = max16065_update_device(dev);
198 	int adc = data->adc[attr->index];
199 
200 	if (unlikely(adc < 0))
201 		return adc;
202 
203 	return sysfs_emit(buf, "%d\n",
204 			  ADC_TO_MV(adc, data->range[attr->index]));
205 }
206 
207 static ssize_t max16065_current_show(struct device *dev,
208 				     struct device_attribute *da, char *buf)
209 {
210 	struct max16065_data *data = max16065_update_device(dev);
211 
212 	if (unlikely(data->curr_sense < 0))
213 		return data->curr_sense;
214 
215 	return sysfs_emit(buf, "%d\n",
216 			  ADC_TO_CURR(data->curr_sense, data->curr_gain));
217 }
218 
219 static ssize_t max16065_limit_store(struct device *dev,
220 				    struct device_attribute *da,
221 				    const char *buf, size_t count)
222 {
223 	struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da);
224 	struct max16065_data *data = dev_get_drvdata(dev);
225 	unsigned long val;
226 	int err;
227 	int limit;
228 
229 	err = kstrtoul(buf, 10, &val);
230 	if (unlikely(err < 0))
231 		return err;
232 
233 	limit = MV_TO_LIMIT(val, data->range[attr2->index]);
234 
235 	mutex_lock(&data->update_lock);
236 	data->limit[attr2->nr][attr2->index]
237 	  = LIMIT_TO_MV(limit, data->range[attr2->index]);
238 	i2c_smbus_write_byte_data(data->client,
239 				  MAX16065_LIMIT(attr2->nr, attr2->index),
240 				  limit);
241 	mutex_unlock(&data->update_lock);
242 
243 	return count;
244 }
245 
246 static ssize_t max16065_limit_show(struct device *dev,
247 				   struct device_attribute *da, char *buf)
248 {
249 	struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da);
250 	struct max16065_data *data = dev_get_drvdata(dev);
251 
252 	return sysfs_emit(buf, "%d\n",
253 			  data->limit[attr2->nr][attr2->index]);
254 }
255 
256 /* Construct a sensor_device_attribute structure for each register */
257 
258 /* Input voltages */
259 static SENSOR_DEVICE_ATTR_RO(in0_input, max16065_input, 0);
260 static SENSOR_DEVICE_ATTR_RO(in1_input, max16065_input, 1);
261 static SENSOR_DEVICE_ATTR_RO(in2_input, max16065_input, 2);
262 static SENSOR_DEVICE_ATTR_RO(in3_input, max16065_input, 3);
263 static SENSOR_DEVICE_ATTR_RO(in4_input, max16065_input, 4);
264 static SENSOR_DEVICE_ATTR_RO(in5_input, max16065_input, 5);
265 static SENSOR_DEVICE_ATTR_RO(in6_input, max16065_input, 6);
266 static SENSOR_DEVICE_ATTR_RO(in7_input, max16065_input, 7);
267 static SENSOR_DEVICE_ATTR_RO(in8_input, max16065_input, 8);
268 static SENSOR_DEVICE_ATTR_RO(in9_input, max16065_input, 9);
269 static SENSOR_DEVICE_ATTR_RO(in10_input, max16065_input, 10);
270 static SENSOR_DEVICE_ATTR_RO(in11_input, max16065_input, 11);
271 static SENSOR_DEVICE_ATTR_RO(in12_input, max16065_input, 12);
272 
273 /* Input voltages lcrit */
274 static SENSOR_DEVICE_ATTR_2_RW(in0_lcrit, max16065_limit, 2, 0);
275 static SENSOR_DEVICE_ATTR_2_RW(in1_lcrit, max16065_limit, 2, 1);
276 static SENSOR_DEVICE_ATTR_2_RW(in2_lcrit, max16065_limit, 2, 2);
277 static SENSOR_DEVICE_ATTR_2_RW(in3_lcrit, max16065_limit, 2, 3);
278 static SENSOR_DEVICE_ATTR_2_RW(in4_lcrit, max16065_limit, 2, 4);
279 static SENSOR_DEVICE_ATTR_2_RW(in5_lcrit, max16065_limit, 2, 5);
280 static SENSOR_DEVICE_ATTR_2_RW(in6_lcrit, max16065_limit, 2, 6);
281 static SENSOR_DEVICE_ATTR_2_RW(in7_lcrit, max16065_limit, 2, 7);
282 static SENSOR_DEVICE_ATTR_2_RW(in8_lcrit, max16065_limit, 2, 8);
283 static SENSOR_DEVICE_ATTR_2_RW(in9_lcrit, max16065_limit, 2, 9);
284 static SENSOR_DEVICE_ATTR_2_RW(in10_lcrit, max16065_limit, 2, 10);
285 static SENSOR_DEVICE_ATTR_2_RW(in11_lcrit, max16065_limit, 2, 11);
286 
287 /* Input voltages crit */
288 static SENSOR_DEVICE_ATTR_2_RW(in0_crit, max16065_limit, 1, 0);
289 static SENSOR_DEVICE_ATTR_2_RW(in1_crit, max16065_limit, 1, 1);
290 static SENSOR_DEVICE_ATTR_2_RW(in2_crit, max16065_limit, 1, 2);
291 static SENSOR_DEVICE_ATTR_2_RW(in3_crit, max16065_limit, 1, 3);
292 static SENSOR_DEVICE_ATTR_2_RW(in4_crit, max16065_limit, 1, 4);
293 static SENSOR_DEVICE_ATTR_2_RW(in5_crit, max16065_limit, 1, 5);
294 static SENSOR_DEVICE_ATTR_2_RW(in6_crit, max16065_limit, 1, 6);
295 static SENSOR_DEVICE_ATTR_2_RW(in7_crit, max16065_limit, 1, 7);
296 static SENSOR_DEVICE_ATTR_2_RW(in8_crit, max16065_limit, 1, 8);
297 static SENSOR_DEVICE_ATTR_2_RW(in9_crit, max16065_limit, 1, 9);
298 static SENSOR_DEVICE_ATTR_2_RW(in10_crit, max16065_limit, 1, 10);
299 static SENSOR_DEVICE_ATTR_2_RW(in11_crit, max16065_limit, 1, 11);
300 
301 /* Input voltages min */
302 static SENSOR_DEVICE_ATTR_2_RW(in0_min, max16065_limit, 0, 0);
303 static SENSOR_DEVICE_ATTR_2_RW(in1_min, max16065_limit, 0, 1);
304 static SENSOR_DEVICE_ATTR_2_RW(in2_min, max16065_limit, 0, 2);
305 static SENSOR_DEVICE_ATTR_2_RW(in3_min, max16065_limit, 0, 3);
306 static SENSOR_DEVICE_ATTR_2_RW(in4_min, max16065_limit, 0, 4);
307 static SENSOR_DEVICE_ATTR_2_RW(in5_min, max16065_limit, 0, 5);
308 static SENSOR_DEVICE_ATTR_2_RW(in6_min, max16065_limit, 0, 6);
309 static SENSOR_DEVICE_ATTR_2_RW(in7_min, max16065_limit, 0, 7);
310 static SENSOR_DEVICE_ATTR_2_RW(in8_min, max16065_limit, 0, 8);
311 static SENSOR_DEVICE_ATTR_2_RW(in9_min, max16065_limit, 0, 9);
312 static SENSOR_DEVICE_ATTR_2_RW(in10_min, max16065_limit, 0, 10);
313 static SENSOR_DEVICE_ATTR_2_RW(in11_min, max16065_limit, 0, 11);
314 
315 /* Input voltages max */
316 static SENSOR_DEVICE_ATTR_2_RW(in0_max, max16065_limit, 0, 0);
317 static SENSOR_DEVICE_ATTR_2_RW(in1_max, max16065_limit, 0, 1);
318 static SENSOR_DEVICE_ATTR_2_RW(in2_max, max16065_limit, 0, 2);
319 static SENSOR_DEVICE_ATTR_2_RW(in3_max, max16065_limit, 0, 3);
320 static SENSOR_DEVICE_ATTR_2_RW(in4_max, max16065_limit, 0, 4);
321 static SENSOR_DEVICE_ATTR_2_RW(in5_max, max16065_limit, 0, 5);
322 static SENSOR_DEVICE_ATTR_2_RW(in6_max, max16065_limit, 0, 6);
323 static SENSOR_DEVICE_ATTR_2_RW(in7_max, max16065_limit, 0, 7);
324 static SENSOR_DEVICE_ATTR_2_RW(in8_max, max16065_limit, 0, 8);
325 static SENSOR_DEVICE_ATTR_2_RW(in9_max, max16065_limit, 0, 9);
326 static SENSOR_DEVICE_ATTR_2_RW(in10_max, max16065_limit, 0, 10);
327 static SENSOR_DEVICE_ATTR_2_RW(in11_max, max16065_limit, 0, 11);
328 
329 /* alarms */
330 static SENSOR_DEVICE_ATTR_2_RO(in0_alarm, max16065_alarm, 0, 0);
331 static SENSOR_DEVICE_ATTR_2_RO(in1_alarm, max16065_alarm, 0, 1);
332 static SENSOR_DEVICE_ATTR_2_RO(in2_alarm, max16065_alarm, 0, 2);
333 static SENSOR_DEVICE_ATTR_2_RO(in3_alarm, max16065_alarm, 0, 3);
334 static SENSOR_DEVICE_ATTR_2_RO(in4_alarm, max16065_alarm, 0, 4);
335 static SENSOR_DEVICE_ATTR_2_RO(in5_alarm, max16065_alarm, 0, 5);
336 static SENSOR_DEVICE_ATTR_2_RO(in6_alarm, max16065_alarm, 0, 6);
337 static SENSOR_DEVICE_ATTR_2_RO(in7_alarm, max16065_alarm, 0, 7);
338 static SENSOR_DEVICE_ATTR_2_RO(in8_alarm, max16065_alarm, 1, 0);
339 static SENSOR_DEVICE_ATTR_2_RO(in9_alarm, max16065_alarm, 1, 1);
340 static SENSOR_DEVICE_ATTR_2_RO(in10_alarm, max16065_alarm, 1, 2);
341 static SENSOR_DEVICE_ATTR_2_RO(in11_alarm, max16065_alarm, 1, 3);
342 
343 /* Current and alarm */
344 static SENSOR_DEVICE_ATTR_RO(curr1_input, max16065_current, 0);
345 static SENSOR_DEVICE_ATTR_2_RO(curr1_alarm, max16065_alarm, 1, 4);
346 
347 /*
348  * Finally, construct an array of pointers to members of the above objects,
349  * as required for sysfs_create_group()
350  */
351 static struct attribute *max16065_basic_attributes[] = {
352 	&sensor_dev_attr_in0_input.dev_attr.attr,
353 	&sensor_dev_attr_in0_lcrit.dev_attr.attr,
354 	&sensor_dev_attr_in0_crit.dev_attr.attr,
355 	&sensor_dev_attr_in0_alarm.dev_attr.attr,
356 
357 	&sensor_dev_attr_in1_input.dev_attr.attr,
358 	&sensor_dev_attr_in1_lcrit.dev_attr.attr,
359 	&sensor_dev_attr_in1_crit.dev_attr.attr,
360 	&sensor_dev_attr_in1_alarm.dev_attr.attr,
361 
362 	&sensor_dev_attr_in2_input.dev_attr.attr,
363 	&sensor_dev_attr_in2_lcrit.dev_attr.attr,
364 	&sensor_dev_attr_in2_crit.dev_attr.attr,
365 	&sensor_dev_attr_in2_alarm.dev_attr.attr,
366 
367 	&sensor_dev_attr_in3_input.dev_attr.attr,
368 	&sensor_dev_attr_in3_lcrit.dev_attr.attr,
369 	&sensor_dev_attr_in3_crit.dev_attr.attr,
370 	&sensor_dev_attr_in3_alarm.dev_attr.attr,
371 
372 	&sensor_dev_attr_in4_input.dev_attr.attr,
373 	&sensor_dev_attr_in4_lcrit.dev_attr.attr,
374 	&sensor_dev_attr_in4_crit.dev_attr.attr,
375 	&sensor_dev_attr_in4_alarm.dev_attr.attr,
376 
377 	&sensor_dev_attr_in5_input.dev_attr.attr,
378 	&sensor_dev_attr_in5_lcrit.dev_attr.attr,
379 	&sensor_dev_attr_in5_crit.dev_attr.attr,
380 	&sensor_dev_attr_in5_alarm.dev_attr.attr,
381 
382 	&sensor_dev_attr_in6_input.dev_attr.attr,
383 	&sensor_dev_attr_in6_lcrit.dev_attr.attr,
384 	&sensor_dev_attr_in6_crit.dev_attr.attr,
385 	&sensor_dev_attr_in6_alarm.dev_attr.attr,
386 
387 	&sensor_dev_attr_in7_input.dev_attr.attr,
388 	&sensor_dev_attr_in7_lcrit.dev_attr.attr,
389 	&sensor_dev_attr_in7_crit.dev_attr.attr,
390 	&sensor_dev_attr_in7_alarm.dev_attr.attr,
391 
392 	&sensor_dev_attr_in8_input.dev_attr.attr,
393 	&sensor_dev_attr_in8_lcrit.dev_attr.attr,
394 	&sensor_dev_attr_in8_crit.dev_attr.attr,
395 	&sensor_dev_attr_in8_alarm.dev_attr.attr,
396 
397 	&sensor_dev_attr_in9_input.dev_attr.attr,
398 	&sensor_dev_attr_in9_lcrit.dev_attr.attr,
399 	&sensor_dev_attr_in9_crit.dev_attr.attr,
400 	&sensor_dev_attr_in9_alarm.dev_attr.attr,
401 
402 	&sensor_dev_attr_in10_input.dev_attr.attr,
403 	&sensor_dev_attr_in10_lcrit.dev_attr.attr,
404 	&sensor_dev_attr_in10_crit.dev_attr.attr,
405 	&sensor_dev_attr_in10_alarm.dev_attr.attr,
406 
407 	&sensor_dev_attr_in11_input.dev_attr.attr,
408 	&sensor_dev_attr_in11_lcrit.dev_attr.attr,
409 	&sensor_dev_attr_in11_crit.dev_attr.attr,
410 	&sensor_dev_attr_in11_alarm.dev_attr.attr,
411 
412 	NULL
413 };
414 
415 static struct attribute *max16065_current_attributes[] = {
416 	&sensor_dev_attr_in12_input.dev_attr.attr,
417 	&sensor_dev_attr_curr1_input.dev_attr.attr,
418 	&sensor_dev_attr_curr1_alarm.dev_attr.attr,
419 	NULL
420 };
421 
422 static struct attribute *max16065_min_attributes[] = {
423 	&sensor_dev_attr_in0_min.dev_attr.attr,
424 	&sensor_dev_attr_in1_min.dev_attr.attr,
425 	&sensor_dev_attr_in2_min.dev_attr.attr,
426 	&sensor_dev_attr_in3_min.dev_attr.attr,
427 	&sensor_dev_attr_in4_min.dev_attr.attr,
428 	&sensor_dev_attr_in5_min.dev_attr.attr,
429 	&sensor_dev_attr_in6_min.dev_attr.attr,
430 	&sensor_dev_attr_in7_min.dev_attr.attr,
431 	&sensor_dev_attr_in8_min.dev_attr.attr,
432 	&sensor_dev_attr_in9_min.dev_attr.attr,
433 	&sensor_dev_attr_in10_min.dev_attr.attr,
434 	&sensor_dev_attr_in11_min.dev_attr.attr,
435 	NULL
436 };
437 
438 static struct attribute *max16065_max_attributes[] = {
439 	&sensor_dev_attr_in0_max.dev_attr.attr,
440 	&sensor_dev_attr_in1_max.dev_attr.attr,
441 	&sensor_dev_attr_in2_max.dev_attr.attr,
442 	&sensor_dev_attr_in3_max.dev_attr.attr,
443 	&sensor_dev_attr_in4_max.dev_attr.attr,
444 	&sensor_dev_attr_in5_max.dev_attr.attr,
445 	&sensor_dev_attr_in6_max.dev_attr.attr,
446 	&sensor_dev_attr_in7_max.dev_attr.attr,
447 	&sensor_dev_attr_in8_max.dev_attr.attr,
448 	&sensor_dev_attr_in9_max.dev_attr.attr,
449 	&sensor_dev_attr_in10_max.dev_attr.attr,
450 	&sensor_dev_attr_in11_max.dev_attr.attr,
451 	NULL
452 };
453 
454 static umode_t max16065_basic_is_visible(struct kobject *kobj,
455 					 struct attribute *a, int n)
456 {
457 	struct device *dev = kobj_to_dev(kobj);
458 	struct max16065_data *data = dev_get_drvdata(dev);
459 	int index = n / 4;
460 
461 	if (index >= data->num_adc || !data->range[index])
462 		return 0;
463 	return a->mode;
464 }
465 
466 static umode_t max16065_secondary_is_visible(struct kobject *kobj,
467 					     struct attribute *a, int index)
468 {
469 	struct device *dev = kobj_to_dev(kobj);
470 	struct max16065_data *data = dev_get_drvdata(dev);
471 
472 	if (index >= data->num_adc)
473 		return 0;
474 	return a->mode;
475 }
476 
477 static const struct attribute_group max16065_basic_group = {
478 	.attrs = max16065_basic_attributes,
479 	.is_visible = max16065_basic_is_visible,
480 };
481 
482 static const struct attribute_group max16065_current_group = {
483 	.attrs = max16065_current_attributes,
484 };
485 
486 static const struct attribute_group max16065_min_group = {
487 	.attrs = max16065_min_attributes,
488 	.is_visible = max16065_secondary_is_visible,
489 };
490 
491 static const struct attribute_group max16065_max_group = {
492 	.attrs = max16065_max_attributes,
493 	.is_visible = max16065_secondary_is_visible,
494 };
495 
496 static const struct i2c_device_id max16065_id[];
497 
498 static int max16065_probe(struct i2c_client *client)
499 {
500 	struct i2c_adapter *adapter = client->adapter;
501 	struct max16065_data *data;
502 	struct device *dev = &client->dev;
503 	struct device *hwmon_dev;
504 	int i, j, val;
505 	bool have_secondary;		/* true if chip has secondary limits */
506 	bool secondary_is_max = false;	/* secondary limits reflect max */
507 	int groups = 0;
508 	const struct i2c_device_id *id = i2c_match_id(max16065_id, client);
509 
510 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
511 				     | I2C_FUNC_SMBUS_READ_WORD_DATA))
512 		return -ENODEV;
513 
514 	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
515 	if (unlikely(!data))
516 		return -ENOMEM;
517 
518 	data->client = client;
519 	mutex_init(&data->update_lock);
520 
521 	data->num_adc = max16065_num_adc[id->driver_data];
522 	data->have_current = max16065_have_current[id->driver_data];
523 	have_secondary = max16065_have_secondary[id->driver_data];
524 
525 	if (have_secondary) {
526 		val = i2c_smbus_read_byte_data(client, MAX16065_SW_ENABLE);
527 		if (unlikely(val < 0))
528 			return val;
529 		secondary_is_max = val & MAX16065_WARNING_OV;
530 	}
531 
532 	/* Read scale registers, convert to range */
533 	for (i = 0; i < DIV_ROUND_UP(data->num_adc, 4); i++) {
534 		val = i2c_smbus_read_byte_data(client, MAX16065_SCALE(i));
535 		if (unlikely(val < 0))
536 			return val;
537 		for (j = 0; j < 4 && i * 4 + j < data->num_adc; j++) {
538 			data->range[i * 4 + j] =
539 			  max16065_adc_range[(val >> (j * 2)) & 0x3];
540 		}
541 	}
542 
543 	/* Read limits */
544 	for (i = 0; i < MAX16065_NUM_LIMIT; i++) {
545 		if (i == 0 && !have_secondary)
546 			continue;
547 
548 		for (j = 0; j < data->num_adc; j++) {
549 			val = i2c_smbus_read_byte_data(client,
550 						       MAX16065_LIMIT(i, j));
551 			if (unlikely(val < 0))
552 				return val;
553 			data->limit[i][j] = LIMIT_TO_MV(val, data->range[j]);
554 		}
555 	}
556 
557 	/* sysfs hooks */
558 	data->groups[groups++] = &max16065_basic_group;
559 	if (have_secondary)
560 		data->groups[groups++] = secondary_is_max ?
561 			&max16065_max_group : &max16065_min_group;
562 
563 	if (data->have_current) {
564 		val = i2c_smbus_read_byte_data(client, MAX16065_CURR_CONTROL);
565 		if (unlikely(val < 0))
566 			return val;
567 		if (val & MAX16065_CURR_ENABLE) {
568 			/*
569 			 * Current gain is 6, 12, 24, 48 based on values in
570 			 * bit 2,3.
571 			 */
572 			data->curr_gain = 6 << ((val >> 2) & 0x03);
573 			data->range[MAX16065_NUM_ADC]
574 			  = max16065_csp_adc_range[(val >> 1) & 0x01];
575 			data->groups[groups++] = &max16065_current_group;
576 		} else {
577 			data->have_current = false;
578 		}
579 	}
580 
581 	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
582 							   data, data->groups);
583 	return PTR_ERR_OR_ZERO(hwmon_dev);
584 }
585 
586 static const struct i2c_device_id max16065_id[] = {
587 	{ "max16065", max16065 },
588 	{ "max16066", max16066 },
589 	{ "max16067", max16067 },
590 	{ "max16068", max16068 },
591 	{ "max16070", max16070 },
592 	{ "max16071", max16071 },
593 	{ }
594 };
595 
596 MODULE_DEVICE_TABLE(i2c, max16065_id);
597 
598 /* This is the driver that will be inserted */
599 static struct i2c_driver max16065_driver = {
600 	.driver = {
601 		.name = "max16065",
602 	},
603 	.probe = max16065_probe,
604 	.id_table = max16065_id,
605 };
606 
607 module_i2c_driver(max16065_driver);
608 
609 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
610 MODULE_DESCRIPTION("MAX16065 driver");
611 MODULE_LICENSE("GPL");
612