1/*
2 * Driver for
3 * Maxim MAX16065/MAX16066 12-Channel/8-Channel, Flash-Configurable
4 * System Managers with Nonvolatile Fault Registers
5 * Maxim MAX16067/MAX16068 6-Channel, Flash-Configurable System Managers
6 * with Nonvolatile Fault Registers
7 * Maxim MAX16070/MAX16071 12-Channel/8-Channel, Flash-Configurable System
8 * Monitors with Nonvolatile Fault Registers
9 *
10 * Copyright (C) 2011 Ericsson AB.
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; version 2 of the License.
15 */
16
17#include <linux/kernel.h>
18#include <linux/module.h>
19#include <linux/init.h>
20#include <linux/err.h>
21#include <linux/slab.h>
22#include <linux/i2c.h>
23#include <linux/hwmon.h>
24#include <linux/hwmon-sysfs.h>
25#include <linux/jiffies.h>
26
27enum chips { max16065, max16066, max16067, max16068, max16070, max16071 };
28
29/*
30 * Registers
31 */
32#define MAX16065_ADC(x) ((x) * 2)
33
34#define MAX16065_CURR_SENSE 0x18
35#define MAX16065_CSP_ADC 0x19
36#define MAX16065_FAULT(x) (0x1b + (x))
37#define MAX16065_SCALE(x) (0x43 + (x))
38#define MAX16065_CURR_CONTROL 0x47
39#define MAX16065_LIMIT(l, x) (0x48 + (l) + (x) * 3) /*
40 * l: limit
41 * 0: min/max
42 * 1: crit
43 * 2: lcrit
44 * x: ADC index
45 */
46
47#define MAX16065_SW_ENABLE 0x73
48
49#define MAX16065_WARNING_OV (1 << 3) /* Set if secondary threshold is OV
50 warning */
51
52#define MAX16065_CURR_ENABLE (1 << 0)
53
54#define MAX16065_NUM_LIMIT 3
55#define MAX16065_NUM_ADC 12 /* maximum number of ADC channels */
56
57static const int max16065_num_adc[] = {
58 [max16065] = 12,
59 [max16066] = 8,
60 [max16067] = 6,
61 [max16068] = 6,
62 [max16070] = 12,
63 [max16071] = 8,
64};
65
66static const bool max16065_have_secondary[] = {
67 [max16065] = true,
68 [max16066] = true,
69 [max16067] = false,
70 [max16068] = false,
71 [max16070] = true,
72 [max16071] = true,
73};
74
75static const bool max16065_have_current[] = {
76 [max16065] = true,
77 [max16066] = true,
78 [max16067] = false,
79 [max16068] = false,
80 [max16070] = true,
81 [max16071] = true,
82};
83
84struct max16065_data {
85 enum chips type;
86 struct i2c_client *client;
87 const struct attribute_group *groups[4];
88 struct mutex update_lock;
89 bool valid;
90 unsigned long last_updated; /* in jiffies */
91 int num_adc;
92 bool have_current;
93 int curr_gain;
94 /* limits are in mV */
95 int limit[MAX16065_NUM_LIMIT][MAX16065_NUM_ADC];
96 int range[MAX16065_NUM_ADC + 1];/* voltage range */
97 int adc[MAX16065_NUM_ADC + 1]; /* adc values (raw) including csp_adc */
98 int curr_sense;
99 int fault[2];
100};
101
102static const int max16065_adc_range[] = { 5560, 2780, 1390, 0 };
103static const int max16065_csp_adc_range[] = { 7000, 14000 };
104
105/* ADC registers have 10 bit resolution. */
106static inline int ADC_TO_MV(int adc, int range)
107{
108 return (adc * range) / 1024;
109}
110
111/*
112 * Limit registers have 8 bit resolution and match upper 8 bits of ADC
113 * registers.
114 */
115static inline int LIMIT_TO_MV(int limit, int range)
116{
117 return limit * range / 256;
118}
119
120static inline int MV_TO_LIMIT(int mv, int range)
121{
122 return clamp_val(DIV_ROUND_CLOSEST(mv * 256, range), 0, 255);
123}
124
125static inline int ADC_TO_CURR(int adc, int gain)
126{
127 return adc * 1400000 / (gain * 255);
128}
129
130/*
131 * max16065_read_adc()
132 *
133 * Read 16 bit value from <reg>, <reg+1>.
134 * Upper 8 bits are in <reg>, lower 2 bits are in bits 7:6 of <reg+1>.
135 */
136static int max16065_read_adc(struct i2c_client *client, int reg)
137{
138 int rv;
139
140 rv = i2c_smbus_read_word_swapped(client, reg);
141 if (unlikely(rv < 0))
142 return rv;
143 return rv >> 6;
144}
145
146static struct max16065_data *max16065_update_device(struct device *dev)
147{
148 struct max16065_data *data = dev_get_drvdata(dev);
149 struct i2c_client *client = data->client;
150
151 mutex_lock(&data->update_lock);
152 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
153 int i;
154
155 for (i = 0; i < data->num_adc; i++)
156 data->adc[i]
157 = max16065_read_adc(client, MAX16065_ADC(i));
158
159 if (data->have_current) {
160 data->adc[MAX16065_NUM_ADC]
161 = max16065_read_adc(client, MAX16065_CSP_ADC);
162 data->curr_sense
163 = i2c_smbus_read_byte_data(client,
164 MAX16065_CURR_SENSE);
165 }
166
167 for (i = 0; i < DIV_ROUND_UP(data->num_adc, 8); i++)
168 data->fault[i]
169 = i2c_smbus_read_byte_data(client, MAX16065_FAULT(i));
170
171 data->last_updated = jiffies;
172 data->valid = 1;
173 }
174 mutex_unlock(&data->update_lock);
175 return data;
176}
177
178static ssize_t max16065_alarm_show(struct device *dev,
179 struct device_attribute *da, char *buf)
180{
181 struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da);
182 struct max16065_data *data = max16065_update_device(dev);
183 int val = data->fault[attr2->nr];
184
185 if (val < 0)
186 return val;
187
188 val &= (1 << attr2->index);
189 if (val)
190 i2c_smbus_write_byte_data(data->client,
191 MAX16065_FAULT(attr2->nr), val);
192
193 return snprintf(buf, PAGE_SIZE, "%d\n", !!val);
194}
195
196static ssize_t max16065_input_show(struct device *dev,
197 struct device_attribute *da, char *buf)
198{
199 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
200 struct max16065_data *data = max16065_update_device(dev);
201 int adc = data->adc[attr->index];
202
203 if (unlikely(adc < 0))
204 return adc;
205
206 return snprintf(buf, PAGE_SIZE, "%d\n",
207 ADC_TO_MV(adc, data->range[attr->index]));
208}
209
210static ssize_t max16065_current_show(struct device *dev,
211 struct device_attribute *da, char *buf)
212{
213 struct max16065_data *data = max16065_update_device(dev);
214
215 if (unlikely(data->curr_sense < 0))
216 return data->curr_sense;
217
218 return snprintf(buf, PAGE_SIZE, "%d\n",
219 ADC_TO_CURR(data->curr_sense, data->curr_gain));
220}
221
222static ssize_t max16065_limit_store(struct device *dev,
223 struct device_attribute *da,
224 const char *buf, size_t count)
225{
226 struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da);
227 struct max16065_data *data = dev_get_drvdata(dev);
228 unsigned long val;
229 int err;
230 int limit;
231
232 err = kstrtoul(buf, 10, &val);
233 if (unlikely(err < 0))
234 return err;
235
236 limit = MV_TO_LIMIT(val, data->range[attr2->index]);
237
238 mutex_lock(&data->update_lock);
239 data->limit[attr2->nr][attr2->index]
240 = LIMIT_TO_MV(limit, data->range[attr2->index]);
241 i2c_smbus_write_byte_data(data->client,
242 MAX16065_LIMIT(attr2->nr, attr2->index),
243 limit);
244 mutex_unlock(&data->update_lock);
245
246 return count;
247}
248
249static ssize_t max16065_limit_show(struct device *dev,
250 struct device_attribute *da, char *buf)
251{
252 struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da);
253 struct max16065_data *data = dev_get_drvdata(dev);
254
255 return snprintf(buf, PAGE_SIZE, "%d\n",
256 data->limit[attr2->nr][attr2->index]);
257}
258
259/* Construct a sensor_device_attribute structure for each register */
260
261/* Input voltages */
262static SENSOR_DEVICE_ATTR_RO(in0_input, max16065_input, 0);
263static SENSOR_DEVICE_ATTR_RO(in1_input, max16065_input, 1);
264static SENSOR_DEVICE_ATTR_RO(in2_input, max16065_input, 2);
265static SENSOR_DEVICE_ATTR_RO(in3_input, max16065_input, 3);
266static SENSOR_DEVICE_ATTR_RO(in4_input, max16065_input, 4);
267static SENSOR_DEVICE_ATTR_RO(in5_input, max16065_input, 5);
268static SENSOR_DEVICE_ATTR_RO(in6_input, max16065_input, 6);
269static SENSOR_DEVICE_ATTR_RO(in7_input, max16065_input, 7);
270static SENSOR_DEVICE_ATTR_RO(in8_input, max16065_input, 8);
271static SENSOR_DEVICE_ATTR_RO(in9_input, max16065_input, 9);
272static SENSOR_DEVICE_ATTR_RO(in10_input, max16065_input, 10);
273static SENSOR_DEVICE_ATTR_RO(in11_input, max16065_input, 11);
274static SENSOR_DEVICE_ATTR_RO(in12_input, max16065_input, 12);
275
276/* Input voltages lcrit */
277static SENSOR_DEVICE_ATTR_2_RW(in0_lcrit, max16065_limit, 2, 0);
278static SENSOR_DEVICE_ATTR_2_RW(in1_lcrit, max16065_limit, 2, 1);
279static SENSOR_DEVICE_ATTR_2_RW(in2_lcrit, max16065_limit, 2, 2);
280static SENSOR_DEVICE_ATTR_2_RW(in3_lcrit, max16065_limit, 2, 3);
281static SENSOR_DEVICE_ATTR_2_RW(in4_lcrit, max16065_limit, 2, 4);
282static SENSOR_DEVICE_ATTR_2_RW(in5_lcrit, max16065_limit, 2, 5);
283static SENSOR_DEVICE_ATTR_2_RW(in6_lcrit, max16065_limit, 2, 6);
284static SENSOR_DEVICE_ATTR_2_RW(in7_lcrit, max16065_limit, 2, 7);
285static SENSOR_DEVICE_ATTR_2_RW(in8_lcrit, max16065_limit, 2, 8);
286static SENSOR_DEVICE_ATTR_2_RW(in9_lcrit, max16065_limit, 2, 9);
287static SENSOR_DEVICE_ATTR_2_RW(in10_lcrit, max16065_limit, 2, 10);
288static SENSOR_DEVICE_ATTR_2_RW(in11_lcrit, max16065_limit, 2, 11);
289
290/* Input voltages crit */
291static SENSOR_DEVICE_ATTR_2_RW(in0_crit, max16065_limit, 1, 0);
292static SENSOR_DEVICE_ATTR_2_RW(in1_crit, max16065_limit, 1, 1);
293static SENSOR_DEVICE_ATTR_2_RW(in2_crit, max16065_limit, 1, 2);
294static SENSOR_DEVICE_ATTR_2_RW(in3_crit, max16065_limit, 1, 3);
295static SENSOR_DEVICE_ATTR_2_RW(in4_crit, max16065_limit, 1, 4);
296static SENSOR_DEVICE_ATTR_2_RW(in5_crit, max16065_limit, 1, 5);
297static SENSOR_DEVICE_ATTR_2_RW(in6_crit, max16065_limit, 1, 6);
298static SENSOR_DEVICE_ATTR_2_RW(in7_crit, max16065_limit, 1, 7);
299static SENSOR_DEVICE_ATTR_2_RW(in8_crit, max16065_limit, 1, 8);
300static SENSOR_DEVICE_ATTR_2_RW(in9_crit, max16065_limit, 1, 9);
301static SENSOR_DEVICE_ATTR_2_RW(in10_crit, max16065_limit, 1, 10);
302static SENSOR_DEVICE_ATTR_2_RW(in11_crit, max16065_limit, 1, 11);
303
304/* Input voltages min */
305static SENSOR_DEVICE_ATTR_2_RW(in0_min, max16065_limit, 0, 0);
306static SENSOR_DEVICE_ATTR_2_RW(in1_min, max16065_limit, 0, 1);
307static SENSOR_DEVICE_ATTR_2_RW(in2_min, max16065_limit, 0, 2);
308static SENSOR_DEVICE_ATTR_2_RW(in3_min, max16065_limit, 0, 3);
309static SENSOR_DEVICE_ATTR_2_RW(in4_min, max16065_limit, 0, 4);
310static SENSOR_DEVICE_ATTR_2_RW(in5_min, max16065_limit, 0, 5);
311static SENSOR_DEVICE_ATTR_2_RW(in6_min, max16065_limit, 0, 6);
312static SENSOR_DEVICE_ATTR_2_RW(in7_min, max16065_limit, 0, 7);
313static SENSOR_DEVICE_ATTR_2_RW(in8_min, max16065_limit, 0, 8);
314static SENSOR_DEVICE_ATTR_2_RW(in9_min, max16065_limit, 0, 9);
315static SENSOR_DEVICE_ATTR_2_RW(in10_min, max16065_limit, 0, 10);
316static SENSOR_DEVICE_ATTR_2_RW(in11_min, max16065_limit, 0, 11);
317
318/* Input voltages max */
319static SENSOR_DEVICE_ATTR_2_RW(in0_max, max16065_limit, 0, 0);
320static SENSOR_DEVICE_ATTR_2_RW(in1_max, max16065_limit, 0, 1);
321static SENSOR_DEVICE_ATTR_2_RW(in2_max, max16065_limit, 0, 2);
322static SENSOR_DEVICE_ATTR_2_RW(in3_max, max16065_limit, 0, 3);
323static SENSOR_DEVICE_ATTR_2_RW(in4_max, max16065_limit, 0, 4);
324static SENSOR_DEVICE_ATTR_2_RW(in5_max, max16065_limit, 0, 5);
325static SENSOR_DEVICE_ATTR_2_RW(in6_max, max16065_limit, 0, 6);
326static SENSOR_DEVICE_ATTR_2_RW(in7_max, max16065_limit, 0, 7);
327static SENSOR_DEVICE_ATTR_2_RW(in8_max, max16065_limit, 0, 8);
328static SENSOR_DEVICE_ATTR_2_RW(in9_max, max16065_limit, 0, 9);
329static SENSOR_DEVICE_ATTR_2_RW(in10_max, max16065_limit, 0, 10);
330static SENSOR_DEVICE_ATTR_2_RW(in11_max, max16065_limit, 0, 11);
331
332/* alarms */
333static SENSOR_DEVICE_ATTR_2_RO(in0_alarm, max16065_alarm, 0, 0);
334static SENSOR_DEVICE_ATTR_2_RO(in1_alarm, max16065_alarm, 0, 1);
335static SENSOR_DEVICE_ATTR_2_RO(in2_alarm, max16065_alarm, 0, 2);
336static SENSOR_DEVICE_ATTR_2_RO(in3_alarm, max16065_alarm, 0, 3);
337static SENSOR_DEVICE_ATTR_2_RO(in4_alarm, max16065_alarm, 0, 4);
338static SENSOR_DEVICE_ATTR_2_RO(in5_alarm, max16065_alarm, 0, 5);
339static SENSOR_DEVICE_ATTR_2_RO(in6_alarm, max16065_alarm, 0, 6);
340static SENSOR_DEVICE_ATTR_2_RO(in7_alarm, max16065_alarm, 0, 7);
341static SENSOR_DEVICE_ATTR_2_RO(in8_alarm, max16065_alarm, 1, 0);
342static SENSOR_DEVICE_ATTR_2_RO(in9_alarm, max16065_alarm, 1, 1);
343static SENSOR_DEVICE_ATTR_2_RO(in10_alarm, max16065_alarm, 1, 2);
344static SENSOR_DEVICE_ATTR_2_RO(in11_alarm, max16065_alarm, 1, 3);
345
346/* Current and alarm */
347static SENSOR_DEVICE_ATTR_RO(curr1_input, max16065_current, 0);
348static SENSOR_DEVICE_ATTR_2_RO(curr1_alarm, max16065_alarm, 1, 4);
349
350/*
351 * Finally, construct an array of pointers to members of the above objects,
352 * as required for sysfs_create_group()
353 */
354static struct attribute *max16065_basic_attributes[] = {
355 &sensor_dev_attr_in0_input.dev_attr.attr,
356 &sensor_dev_attr_in0_lcrit.dev_attr.attr,
357 &sensor_dev_attr_in0_crit.dev_attr.attr,
358 &sensor_dev_attr_in0_alarm.dev_attr.attr,
359
360 &sensor_dev_attr_in1_input.dev_attr.attr,
361 &sensor_dev_attr_in1_lcrit.dev_attr.attr,
362 &sensor_dev_attr_in1_crit.dev_attr.attr,
363 &sensor_dev_attr_in1_alarm.dev_attr.attr,
364
365 &sensor_dev_attr_in2_input.dev_attr.attr,
366 &sensor_dev_attr_in2_lcrit.dev_attr.attr,
367 &sensor_dev_attr_in2_crit.dev_attr.attr,
368 &sensor_dev_attr_in2_alarm.dev_attr.attr,
369
370 &sensor_dev_attr_in3_input.dev_attr.attr,
371 &sensor_dev_attr_in3_lcrit.dev_attr.attr,
372 &sensor_dev_attr_in3_crit.dev_attr.attr,
373 &sensor_dev_attr_in3_alarm.dev_attr.attr,
374
375 &sensor_dev_attr_in4_input.dev_attr.attr,
376 &sensor_dev_attr_in4_lcrit.dev_attr.attr,
377 &sensor_dev_attr_in4_crit.dev_attr.attr,
378 &sensor_dev_attr_in4_alarm.dev_attr.attr,
379
380 &sensor_dev_attr_in5_input.dev_attr.attr,
381 &sensor_dev_attr_in5_lcrit.dev_attr.attr,
382 &sensor_dev_attr_in5_crit.dev_attr.attr,
383 &sensor_dev_attr_in5_alarm.dev_attr.attr,
384
385 &sensor_dev_attr_in6_input.dev_attr.attr,
386 &sensor_dev_attr_in6_lcrit.dev_attr.attr,
387 &sensor_dev_attr_in6_crit.dev_attr.attr,
388 &sensor_dev_attr_in6_alarm.dev_attr.attr,
389
390 &sensor_dev_attr_in7_input.dev_attr.attr,
391 &sensor_dev_attr_in7_lcrit.dev_attr.attr,
392 &sensor_dev_attr_in7_crit.dev_attr.attr,
393 &sensor_dev_attr_in7_alarm.dev_attr.attr,
394
395 &sensor_dev_attr_in8_input.dev_attr.attr,
396 &sensor_dev_attr_in8_lcrit.dev_attr.attr,
397 &sensor_dev_attr_in8_crit.dev_attr.attr,
398 &sensor_dev_attr_in8_alarm.dev_attr.attr,
399
400 &sensor_dev_attr_in9_input.dev_attr.attr,
401 &sensor_dev_attr_in9_lcrit.dev_attr.attr,
402 &sensor_dev_attr_in9_crit.dev_attr.attr,
403 &sensor_dev_attr_in9_alarm.dev_attr.attr,
404
405 &sensor_dev_attr_in10_input.dev_attr.attr,
406 &sensor_dev_attr_in10_lcrit.dev_attr.attr,
407 &sensor_dev_attr_in10_crit.dev_attr.attr,
408 &sensor_dev_attr_in10_alarm.dev_attr.attr,
409
410 &sensor_dev_attr_in11_input.dev_attr.attr,
411 &sensor_dev_attr_in11_lcrit.dev_attr.attr,
412 &sensor_dev_attr_in11_crit.dev_attr.attr,
413 &sensor_dev_attr_in11_alarm.dev_attr.attr,
414
415 NULL
416};
417
418static struct attribute *max16065_current_attributes[] = {
419 &sensor_dev_attr_in12_input.dev_attr.attr,
420 &sensor_dev_attr_curr1_input.dev_attr.attr,
421 &sensor_dev_attr_curr1_alarm.dev_attr.attr,
422 NULL
423};
424
425static struct attribute *max16065_min_attributes[] = {
426 &sensor_dev_attr_in0_min.dev_attr.attr,
427 &sensor_dev_attr_in1_min.dev_attr.attr,
428 &sensor_dev_attr_in2_min.dev_attr.attr,
429 &sensor_dev_attr_in3_min.dev_attr.attr,
430 &sensor_dev_attr_in4_min.dev_attr.attr,
431 &sensor_dev_attr_in5_min.dev_attr.attr,
432 &sensor_dev_attr_in6_min.dev_attr.attr,
433 &sensor_dev_attr_in7_min.dev_attr.attr,
434 &sensor_dev_attr_in8_min.dev_attr.attr,
435 &sensor_dev_attr_in9_min.dev_attr.attr,
436 &sensor_dev_attr_in10_min.dev_attr.attr,
437 &sensor_dev_attr_in11_min.dev_attr.attr,
438 NULL
439};
440
441static struct attribute *max16065_max_attributes[] = {
442 &sensor_dev_attr_in0_max.dev_attr.attr,
443 &sensor_dev_attr_in1_max.dev_attr.attr,
444 &sensor_dev_attr_in2_max.dev_attr.attr,
445 &sensor_dev_attr_in3_max.dev_attr.attr,
446 &sensor_dev_attr_in4_max.dev_attr.attr,
447 &sensor_dev_attr_in5_max.dev_attr.attr,
448 &sensor_dev_attr_in6_max.dev_attr.attr,
449 &sensor_dev_attr_in7_max.dev_attr.attr,
450 &sensor_dev_attr_in8_max.dev_attr.attr,
451 &sensor_dev_attr_in9_max.dev_attr.attr,
452 &sensor_dev_attr_in10_max.dev_attr.attr,
453 &sensor_dev_attr_in11_max.dev_attr.attr,
454 NULL
455};
456
457static umode_t max16065_basic_is_visible(struct kobject *kobj,
458 struct attribute *a, int n)
459{
460 struct device *dev = container_of(kobj, struct device, kobj);
461 struct max16065_data *data = dev_get_drvdata(dev);
462 int index = n / 4;
463
464 if (index >= data->num_adc || !data->range[index])
465 return 0;
466 return a->mode;
467}
468
469static umode_t max16065_secondary_is_visible(struct kobject *kobj,
470 struct attribute *a, int index)
471{
472 struct device *dev = container_of(kobj, struct device, kobj);
473 struct max16065_data *data = dev_get_drvdata(dev);
474
475 if (index >= data->num_adc)
476 return 0;
477 return a->mode;
478}
479
480static const struct attribute_group max16065_basic_group = {
481 .attrs = max16065_basic_attributes,
482 .is_visible = max16065_basic_is_visible,
483};
484
485static const struct attribute_group max16065_current_group = {
486 .attrs = max16065_current_attributes,
487};
488
489static const struct attribute_group max16065_min_group = {
490 .attrs = max16065_min_attributes,
491 .is_visible = max16065_secondary_is_visible,
492};
493
494static const struct attribute_group max16065_max_group = {
495 .attrs = max16065_max_attributes,
496 .is_visible = max16065_secondary_is_visible,
497};
498
499static int max16065_probe(struct i2c_client *client,
500 const struct i2c_device_id *id)
501{
502 struct i2c_adapter *adapter = client->adapter;
503 struct max16065_data *data;
504 struct device *dev = &client->dev;
505 struct device *hwmon_dev;
506 int i, j, val;
507 bool have_secondary; /* true if chip has secondary limits */
508 bool secondary_is_max = false; /* secondary limits reflect max */
509 int groups = 0;
510
511 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
512 | I2C_FUNC_SMBUS_READ_WORD_DATA))
513 return -ENODEV;
514
515 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
516 if (unlikely(!data))
517 return -ENOMEM;
518
519 data->client = client;
520 mutex_init(&data->update_lock);
521
522 data->num_adc = max16065_num_adc[id->driver_data];
523 data->have_current = max16065_have_current[id->driver_data];
524 have_secondary = max16065_have_secondary[id->driver_data];
525
526 if (have_secondary) {
527 val = i2c_smbus_read_byte_data(client, MAX16065_SW_ENABLE);
528 if (unlikely(val < 0))
529 return val;
530 secondary_is_max = val & MAX16065_WARNING_OV;
531 }
532
533 /* Read scale registers, convert to range */
534 for (i = 0; i < DIV_ROUND_UP(data->num_adc, 4); i++) {
535 val = i2c_smbus_read_byte_data(client, MAX16065_SCALE(i));
536 if (unlikely(val < 0))
537 return val;
538 for (j = 0; j < 4 && i * 4 + j < data->num_adc; j++) {
539 data->range[i * 4 + j] =
540 max16065_adc_range[(val >> (j * 2)) & 0x3];
541 }
542 }
543
544 /* Read limits */
545 for (i = 0; i < MAX16065_NUM_LIMIT; i++) {
546 if (i == 0 && !have_secondary)
547 continue;
548
549 for (j = 0; j < data->num_adc; j++) {
550 val = i2c_smbus_read_byte_data(client,
551 MAX16065_LIMIT(i, j));
552 if (unlikely(val < 0))
553 return val;
554 data->limit[i][j] = LIMIT_TO_MV(val, data->range[j]);
555 }
556 }
557
558 /* sysfs hooks */
559 data->groups[groups++] = &max16065_basic_group;
560 if (have_secondary)
561 data->groups[groups++] = secondary_is_max ?
562 &max16065_max_group : &max16065_min_group;
563
564 if (data->have_current) {
565 val = i2c_smbus_read_byte_data(client, MAX16065_CURR_CONTROL);
566 if (unlikely(val < 0))
567 return val;
568 if (val & MAX16065_CURR_ENABLE) {
569 /*
570 * Current gain is 6, 12, 24, 48 based on values in
571 * bit 2,3.
572 */
573 data->curr_gain = 6 << ((val >> 2) & 0x03);
574 data->range[MAX16065_NUM_ADC]
575 = max16065_csp_adc_range[(val >> 1) & 0x01];
576 data->groups[groups++] = &max16065_current_group;
577 } else {
578 data->have_current = false;
579 }
580 }
581
582 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
583 data, data->groups);
584 return PTR_ERR_OR_ZERO(hwmon_dev);
585}
586
587static const struct i2c_device_id max16065_id[] = {
588 { "max16065", max16065 },
589 { "max16066", max16066 },
590 { "max16067", max16067 },
591 { "max16068", max16068 },
592 { "max16070", max16070 },
593 { "max16071", max16071 },
594 { }
595};
596
597MODULE_DEVICE_TABLE(i2c, max16065_id);
598
599/* This is the driver that will be inserted */
600static struct i2c_driver max16065_driver = {
601 .driver = {
602 .name = "max16065",
603 },
604 .probe = max16065_probe,
605 .id_table = max16065_id,
606};
607
608module_i2c_driver(max16065_driver);
609
610MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
611MODULE_DESCRIPTION("MAX16065 driver");
612MODULE_LICENSE("GPL");
613