tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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
24enum 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
54static 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
63static 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
72static 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
81struct max16065_data {
82 enum chips chip;
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
99static const int max16065_adc_range[] = { 5560, 2780, 1390, 0 };
100static const int max16065_csp_adc_range[] = { 7000, 14000 };
101
102/* ADC registers have 10 bit resolution. */
103static 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 */
112static inline int LIMIT_TO_MV(int limit, int range)
113{
114 return limit * range / 256;
115}
116
117static inline int MV_TO_LIMIT(unsigned long mv, int range)
118{
119 mv = clamp_val(mv, 0, ULONG_MAX / 256);
120 return DIV_ROUND_CLOSEST(clamp_val(mv * 256, 0, range * 255), range);
121}
122
123static inline int ADC_TO_CURR(int adc, int gain)
124{
125 return adc * 1400000 / (gain * 255);
126}
127
128/*
129 * max16065_read_adc()
130 *
131 * Read 16 bit value from <reg>, <reg+1>.
132 * Upper 8 bits are in <reg>, lower 2 bits are in bits 7:6 of <reg+1>.
133 */
134static int max16065_read_adc(struct i2c_client *client, int reg)
135{
136 int rv;
137
138 rv = i2c_smbus_read_word_swapped(client, reg);
139 if (unlikely(rv < 0))
140 return rv;
141 return rv >> 6;
142}
143
144static struct max16065_data *max16065_update_device(struct device *dev)
145{
146 struct max16065_data *data = dev_get_drvdata(dev);
147 struct i2c_client *client = data->client;
148
149 mutex_lock(&data->update_lock);
150 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
151 int i;
152
153 for (i = 0; i < data->num_adc; i++)
154 data->adc[i]
155 = max16065_read_adc(client, MAX16065_ADC(i));
156
157 if (data->have_current) {
158 data->adc[MAX16065_NUM_ADC]
159 = max16065_read_adc(client, MAX16065_CSP_ADC);
160 data->curr_sense
161 = i2c_smbus_read_byte_data(client,
162 MAX16065_CURR_SENSE);
163 }
164
165 for (i = 0; i < 2; i++)
166 data->fault[i]
167 = i2c_smbus_read_byte_data(client, MAX16065_FAULT(i));
168
169 /*
170 * MAX16067 and MAX16068 have separate undervoltage and
171 * overvoltage alarm bits. Squash them together.
172 */
173 if (data->chip == max16067 || data->chip == max16068)
174 data->fault[0] |= data->fault[1];
175
176 data->last_updated = jiffies;
177 data->valid = true;
178 }
179 mutex_unlock(&data->update_lock);
180 return data;
181}
182
183static ssize_t max16065_alarm_show(struct device *dev,
184 struct device_attribute *da, char *buf)
185{
186 struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da);
187 struct max16065_data *data = max16065_update_device(dev);
188 int val = data->fault[attr2->nr];
189
190 if (val < 0)
191 return val;
192
193 val &= (1 << attr2->index);
194 if (val)
195 i2c_smbus_write_byte_data(data->client,
196 MAX16065_FAULT(attr2->nr), val);
197
198 return sysfs_emit(buf, "%d\n", !!val);
199}
200
201static ssize_t max16065_input_show(struct device *dev,
202 struct device_attribute *da, char *buf)
203{
204 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
205 struct max16065_data *data = max16065_update_device(dev);
206 int adc = data->adc[attr->index];
207
208 if (unlikely(adc < 0))
209 return adc;
210
211 return sysfs_emit(buf, "%d\n",
212 ADC_TO_MV(adc, data->range[attr->index]));
213}
214
215static ssize_t max16065_current_show(struct device *dev,
216 struct device_attribute *da, char *buf)
217{
218 struct max16065_data *data = max16065_update_device(dev);
219 int curr_sense = data->curr_sense;
220
221 if (unlikely(curr_sense < 0))
222 return curr_sense;
223
224 return sysfs_emit(buf, "%d\n",
225 ADC_TO_CURR(curr_sense, data->curr_gain));
226}
227
228static ssize_t max16065_limit_store(struct device *dev,
229 struct device_attribute *da,
230 const char *buf, size_t count)
231{
232 struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da);
233 struct max16065_data *data = dev_get_drvdata(dev);
234 unsigned long val;
235 int err;
236 int limit;
237
238 err = kstrtoul(buf, 10, &val);
239 if (unlikely(err < 0))
240 return err;
241
242 limit = MV_TO_LIMIT(val, data->range[attr2->index]);
243
244 mutex_lock(&data->update_lock);
245 data->limit[attr2->nr][attr2->index]
246 = LIMIT_TO_MV(limit, data->range[attr2->index]);
247 i2c_smbus_write_byte_data(data->client,
248 MAX16065_LIMIT(attr2->nr, attr2->index),
249 limit);
250 mutex_unlock(&data->update_lock);
251
252 return count;
253}
254
255static ssize_t max16065_limit_show(struct device *dev,
256 struct device_attribute *da, char *buf)
257{
258 struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da);
259 struct max16065_data *data = dev_get_drvdata(dev);
260
261 return sysfs_emit(buf, "%d\n",
262 data->limit[attr2->nr][attr2->index]);
263}
264
265/* Construct a sensor_device_attribute structure for each register */
266
267/* Input voltages */
268static SENSOR_DEVICE_ATTR_RO(in0_input, max16065_input, 0);
269static SENSOR_DEVICE_ATTR_RO(in1_input, max16065_input, 1);
270static SENSOR_DEVICE_ATTR_RO(in2_input, max16065_input, 2);
271static SENSOR_DEVICE_ATTR_RO(in3_input, max16065_input, 3);
272static SENSOR_DEVICE_ATTR_RO(in4_input, max16065_input, 4);
273static SENSOR_DEVICE_ATTR_RO(in5_input, max16065_input, 5);
274static SENSOR_DEVICE_ATTR_RO(in6_input, max16065_input, 6);
275static SENSOR_DEVICE_ATTR_RO(in7_input, max16065_input, 7);
276static SENSOR_DEVICE_ATTR_RO(in8_input, max16065_input, 8);
277static SENSOR_DEVICE_ATTR_RO(in9_input, max16065_input, 9);
278static SENSOR_DEVICE_ATTR_RO(in10_input, max16065_input, 10);
279static SENSOR_DEVICE_ATTR_RO(in11_input, max16065_input, 11);
280static SENSOR_DEVICE_ATTR_RO(in12_input, max16065_input, 12);
281
282/* Input voltages lcrit */
283static SENSOR_DEVICE_ATTR_2_RW(in0_lcrit, max16065_limit, 2, 0);
284static SENSOR_DEVICE_ATTR_2_RW(in1_lcrit, max16065_limit, 2, 1);
285static SENSOR_DEVICE_ATTR_2_RW(in2_lcrit, max16065_limit, 2, 2);
286static SENSOR_DEVICE_ATTR_2_RW(in3_lcrit, max16065_limit, 2, 3);
287static SENSOR_DEVICE_ATTR_2_RW(in4_lcrit, max16065_limit, 2, 4);
288static SENSOR_DEVICE_ATTR_2_RW(in5_lcrit, max16065_limit, 2, 5);
289static SENSOR_DEVICE_ATTR_2_RW(in6_lcrit, max16065_limit, 2, 6);
290static SENSOR_DEVICE_ATTR_2_RW(in7_lcrit, max16065_limit, 2, 7);
291static SENSOR_DEVICE_ATTR_2_RW(in8_lcrit, max16065_limit, 2, 8);
292static SENSOR_DEVICE_ATTR_2_RW(in9_lcrit, max16065_limit, 2, 9);
293static SENSOR_DEVICE_ATTR_2_RW(in10_lcrit, max16065_limit, 2, 10);
294static SENSOR_DEVICE_ATTR_2_RW(in11_lcrit, max16065_limit, 2, 11);
295
296/* Input voltages crit */
297static SENSOR_DEVICE_ATTR_2_RW(in0_crit, max16065_limit, 1, 0);
298static SENSOR_DEVICE_ATTR_2_RW(in1_crit, max16065_limit, 1, 1);
299static SENSOR_DEVICE_ATTR_2_RW(in2_crit, max16065_limit, 1, 2);
300static SENSOR_DEVICE_ATTR_2_RW(in3_crit, max16065_limit, 1, 3);
301static SENSOR_DEVICE_ATTR_2_RW(in4_crit, max16065_limit, 1, 4);
302static SENSOR_DEVICE_ATTR_2_RW(in5_crit, max16065_limit, 1, 5);
303static SENSOR_DEVICE_ATTR_2_RW(in6_crit, max16065_limit, 1, 6);
304static SENSOR_DEVICE_ATTR_2_RW(in7_crit, max16065_limit, 1, 7);
305static SENSOR_DEVICE_ATTR_2_RW(in8_crit, max16065_limit, 1, 8);
306static SENSOR_DEVICE_ATTR_2_RW(in9_crit, max16065_limit, 1, 9);
307static SENSOR_DEVICE_ATTR_2_RW(in10_crit, max16065_limit, 1, 10);
308static SENSOR_DEVICE_ATTR_2_RW(in11_crit, max16065_limit, 1, 11);
309
310/* Input voltages min */
311static SENSOR_DEVICE_ATTR_2_RW(in0_min, max16065_limit, 0, 0);
312static SENSOR_DEVICE_ATTR_2_RW(in1_min, max16065_limit, 0, 1);
313static SENSOR_DEVICE_ATTR_2_RW(in2_min, max16065_limit, 0, 2);
314static SENSOR_DEVICE_ATTR_2_RW(in3_min, max16065_limit, 0, 3);
315static SENSOR_DEVICE_ATTR_2_RW(in4_min, max16065_limit, 0, 4);
316static SENSOR_DEVICE_ATTR_2_RW(in5_min, max16065_limit, 0, 5);
317static SENSOR_DEVICE_ATTR_2_RW(in6_min, max16065_limit, 0, 6);
318static SENSOR_DEVICE_ATTR_2_RW(in7_min, max16065_limit, 0, 7);
319static SENSOR_DEVICE_ATTR_2_RW(in8_min, max16065_limit, 0, 8);
320static SENSOR_DEVICE_ATTR_2_RW(in9_min, max16065_limit, 0, 9);
321static SENSOR_DEVICE_ATTR_2_RW(in10_min, max16065_limit, 0, 10);
322static SENSOR_DEVICE_ATTR_2_RW(in11_min, max16065_limit, 0, 11);
323
324/* Input voltages max */
325static SENSOR_DEVICE_ATTR_2_RW(in0_max, max16065_limit, 0, 0);
326static SENSOR_DEVICE_ATTR_2_RW(in1_max, max16065_limit, 0, 1);
327static SENSOR_DEVICE_ATTR_2_RW(in2_max, max16065_limit, 0, 2);
328static SENSOR_DEVICE_ATTR_2_RW(in3_max, max16065_limit, 0, 3);
329static SENSOR_DEVICE_ATTR_2_RW(in4_max, max16065_limit, 0, 4);
330static SENSOR_DEVICE_ATTR_2_RW(in5_max, max16065_limit, 0, 5);
331static SENSOR_DEVICE_ATTR_2_RW(in6_max, max16065_limit, 0, 6);
332static SENSOR_DEVICE_ATTR_2_RW(in7_max, max16065_limit, 0, 7);
333static SENSOR_DEVICE_ATTR_2_RW(in8_max, max16065_limit, 0, 8);
334static SENSOR_DEVICE_ATTR_2_RW(in9_max, max16065_limit, 0, 9);
335static SENSOR_DEVICE_ATTR_2_RW(in10_max, max16065_limit, 0, 10);
336static SENSOR_DEVICE_ATTR_2_RW(in11_max, max16065_limit, 0, 11);
337
338/* alarms */
339static SENSOR_DEVICE_ATTR_2_RO(in0_alarm, max16065_alarm, 0, 0);
340static SENSOR_DEVICE_ATTR_2_RO(in1_alarm, max16065_alarm, 0, 1);
341static SENSOR_DEVICE_ATTR_2_RO(in2_alarm, max16065_alarm, 0, 2);
342static SENSOR_DEVICE_ATTR_2_RO(in3_alarm, max16065_alarm, 0, 3);
343static SENSOR_DEVICE_ATTR_2_RO(in4_alarm, max16065_alarm, 0, 4);
344static SENSOR_DEVICE_ATTR_2_RO(in5_alarm, max16065_alarm, 0, 5);
345static SENSOR_DEVICE_ATTR_2_RO(in6_alarm, max16065_alarm, 0, 6);
346static SENSOR_DEVICE_ATTR_2_RO(in7_alarm, max16065_alarm, 0, 7);
347static SENSOR_DEVICE_ATTR_2_RO(in8_alarm, max16065_alarm, 1, 0);
348static SENSOR_DEVICE_ATTR_2_RO(in9_alarm, max16065_alarm, 1, 1);
349static SENSOR_DEVICE_ATTR_2_RO(in10_alarm, max16065_alarm, 1, 2);
350static SENSOR_DEVICE_ATTR_2_RO(in11_alarm, max16065_alarm, 1, 3);
351
352/* Current and alarm */
353static SENSOR_DEVICE_ATTR_RO(curr1_input, max16065_current, 0);
354static SENSOR_DEVICE_ATTR_2_RO(curr1_alarm, max16065_alarm, 1, 4);
355
356/*
357 * Finally, construct an array of pointers to members of the above objects,
358 * as required for sysfs_create_group()
359 */
360static struct attribute *max16065_basic_attributes[] = {
361 &sensor_dev_attr_in0_input.dev_attr.attr,
362 &sensor_dev_attr_in0_lcrit.dev_attr.attr,
363 &sensor_dev_attr_in0_crit.dev_attr.attr,
364 &sensor_dev_attr_in0_alarm.dev_attr.attr,
365
366 &sensor_dev_attr_in1_input.dev_attr.attr,
367 &sensor_dev_attr_in1_lcrit.dev_attr.attr,
368 &sensor_dev_attr_in1_crit.dev_attr.attr,
369 &sensor_dev_attr_in1_alarm.dev_attr.attr,
370
371 &sensor_dev_attr_in2_input.dev_attr.attr,
372 &sensor_dev_attr_in2_lcrit.dev_attr.attr,
373 &sensor_dev_attr_in2_crit.dev_attr.attr,
374 &sensor_dev_attr_in2_alarm.dev_attr.attr,
375
376 &sensor_dev_attr_in3_input.dev_attr.attr,
377 &sensor_dev_attr_in3_lcrit.dev_attr.attr,
378 &sensor_dev_attr_in3_crit.dev_attr.attr,
379 &sensor_dev_attr_in3_alarm.dev_attr.attr,
380
381 &sensor_dev_attr_in4_input.dev_attr.attr,
382 &sensor_dev_attr_in4_lcrit.dev_attr.attr,
383 &sensor_dev_attr_in4_crit.dev_attr.attr,
384 &sensor_dev_attr_in4_alarm.dev_attr.attr,
385
386 &sensor_dev_attr_in5_input.dev_attr.attr,
387 &sensor_dev_attr_in5_lcrit.dev_attr.attr,
388 &sensor_dev_attr_in5_crit.dev_attr.attr,
389 &sensor_dev_attr_in5_alarm.dev_attr.attr,
390
391 &sensor_dev_attr_in6_input.dev_attr.attr,
392 &sensor_dev_attr_in6_lcrit.dev_attr.attr,
393 &sensor_dev_attr_in6_crit.dev_attr.attr,
394 &sensor_dev_attr_in6_alarm.dev_attr.attr,
395
396 &sensor_dev_attr_in7_input.dev_attr.attr,
397 &sensor_dev_attr_in7_lcrit.dev_attr.attr,
398 &sensor_dev_attr_in7_crit.dev_attr.attr,
399 &sensor_dev_attr_in7_alarm.dev_attr.attr,
400
401 &sensor_dev_attr_in8_input.dev_attr.attr,
402 &sensor_dev_attr_in8_lcrit.dev_attr.attr,
403 &sensor_dev_attr_in8_crit.dev_attr.attr,
404 &sensor_dev_attr_in8_alarm.dev_attr.attr,
405
406 &sensor_dev_attr_in9_input.dev_attr.attr,
407 &sensor_dev_attr_in9_lcrit.dev_attr.attr,
408 &sensor_dev_attr_in9_crit.dev_attr.attr,
409 &sensor_dev_attr_in9_alarm.dev_attr.attr,
410
411 &sensor_dev_attr_in10_input.dev_attr.attr,
412 &sensor_dev_attr_in10_lcrit.dev_attr.attr,
413 &sensor_dev_attr_in10_crit.dev_attr.attr,
414 &sensor_dev_attr_in10_alarm.dev_attr.attr,
415
416 &sensor_dev_attr_in11_input.dev_attr.attr,
417 &sensor_dev_attr_in11_lcrit.dev_attr.attr,
418 &sensor_dev_attr_in11_crit.dev_attr.attr,
419 &sensor_dev_attr_in11_alarm.dev_attr.attr,
420
421 NULL
422};
423
424static struct attribute *max16065_current_attributes[] = {
425 &sensor_dev_attr_in12_input.dev_attr.attr,
426 &sensor_dev_attr_curr1_input.dev_attr.attr,
427 &sensor_dev_attr_curr1_alarm.dev_attr.attr,
428 NULL
429};
430
431static struct attribute *max16065_min_attributes[] = {
432 &sensor_dev_attr_in0_min.dev_attr.attr,
433 &sensor_dev_attr_in1_min.dev_attr.attr,
434 &sensor_dev_attr_in2_min.dev_attr.attr,
435 &sensor_dev_attr_in3_min.dev_attr.attr,
436 &sensor_dev_attr_in4_min.dev_attr.attr,
437 &sensor_dev_attr_in5_min.dev_attr.attr,
438 &sensor_dev_attr_in6_min.dev_attr.attr,
439 &sensor_dev_attr_in7_min.dev_attr.attr,
440 &sensor_dev_attr_in8_min.dev_attr.attr,
441 &sensor_dev_attr_in9_min.dev_attr.attr,
442 &sensor_dev_attr_in10_min.dev_attr.attr,
443 &sensor_dev_attr_in11_min.dev_attr.attr,
444 NULL
445};
446
447static struct attribute *max16065_max_attributes[] = {
448 &sensor_dev_attr_in0_max.dev_attr.attr,
449 &sensor_dev_attr_in1_max.dev_attr.attr,
450 &sensor_dev_attr_in2_max.dev_attr.attr,
451 &sensor_dev_attr_in3_max.dev_attr.attr,
452 &sensor_dev_attr_in4_max.dev_attr.attr,
453 &sensor_dev_attr_in5_max.dev_attr.attr,
454 &sensor_dev_attr_in6_max.dev_attr.attr,
455 &sensor_dev_attr_in7_max.dev_attr.attr,
456 &sensor_dev_attr_in8_max.dev_attr.attr,
457 &sensor_dev_attr_in9_max.dev_attr.attr,
458 &sensor_dev_attr_in10_max.dev_attr.attr,
459 &sensor_dev_attr_in11_max.dev_attr.attr,
460 NULL
461};
462
463static umode_t max16065_basic_is_visible(struct kobject *kobj,
464 struct attribute *a, int n)
465{
466 struct device *dev = kobj_to_dev(kobj);
467 struct max16065_data *data = dev_get_drvdata(dev);
468 int index = n / 4;
469
470 if (index >= data->num_adc || !data->range[index])
471 return 0;
472 return a->mode;
473}
474
475static umode_t max16065_secondary_is_visible(struct kobject *kobj,
476 struct attribute *a, int index)
477{
478 struct device *dev = kobj_to_dev(kobj);
479 struct max16065_data *data = dev_get_drvdata(dev);
480
481 if (index >= data->num_adc)
482 return 0;
483 return a->mode;
484}
485
486static const struct attribute_group max16065_basic_group = {
487 .attrs = max16065_basic_attributes,
488 .is_visible = max16065_basic_is_visible,
489};
490
491static const struct attribute_group max16065_current_group = {
492 .attrs = max16065_current_attributes,
493};
494
495static const struct attribute_group max16065_min_group = {
496 .attrs = max16065_min_attributes,
497 .is_visible = max16065_secondary_is_visible,
498};
499
500static const struct attribute_group max16065_max_group = {
501 .attrs = max16065_max_attributes,
502 .is_visible = max16065_secondary_is_visible,
503};
504
505static int max16065_probe(struct i2c_client *client)
506{
507 struct i2c_adapter *adapter = client->adapter;
508 struct max16065_data *data;
509 struct device *dev = &client->dev;
510 struct device *hwmon_dev;
511 int i, j, val;
512 bool have_secondary; /* true if chip has secondary limits */
513 bool secondary_is_max = false; /* secondary limits reflect max */
514 int groups = 0;
515 enum chips chip = (uintptr_t)i2c_get_match_data(client);
516
517 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
518 | I2C_FUNC_SMBUS_READ_WORD_DATA))
519 return -ENODEV;
520
521 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
522 if (unlikely(!data))
523 return -ENOMEM;
524
525 data->chip = chip;
526 data->client = client;
527 mutex_init(&data->update_lock);
528
529 data->num_adc = max16065_num_adc[chip];
530 data->have_current = max16065_have_current[chip];
531 have_secondary = max16065_have_secondary[chip];
532
533 if (have_secondary) {
534 val = i2c_smbus_read_byte_data(client, MAX16065_SW_ENABLE);
535 if (unlikely(val < 0))
536 return val;
537 secondary_is_max = val & MAX16065_WARNING_OV;
538 }
539
540 /* Read scale registers, convert to range */
541 for (i = 0; i < DIV_ROUND_UP(data->num_adc, 4); i++) {
542 val = i2c_smbus_read_byte_data(client, MAX16065_SCALE(i));
543 if (unlikely(val < 0))
544 return val;
545 for (j = 0; j < 4 && i * 4 + j < data->num_adc; j++) {
546 data->range[i * 4 + j] =
547 max16065_adc_range[(val >> (j * 2)) & 0x3];
548 }
549 }
550
551 /* Read limits */
552 for (i = 0; i < MAX16065_NUM_LIMIT; i++) {
553 if (i == 0 && !have_secondary)
554 continue;
555
556 for (j = 0; j < data->num_adc; j++) {
557 val = i2c_smbus_read_byte_data(client,
558 MAX16065_LIMIT(i, j));
559 if (unlikely(val < 0))
560 return val;
561 data->limit[i][j] = LIMIT_TO_MV(val, data->range[j]);
562 }
563 }
564
565 /* sysfs hooks */
566 data->groups[groups++] = &max16065_basic_group;
567 if (have_secondary)
568 data->groups[groups++] = secondary_is_max ?
569 &max16065_max_group : &max16065_min_group;
570
571 if (data->have_current) {
572 val = i2c_smbus_read_byte_data(client, MAX16065_CURR_CONTROL);
573 if (unlikely(val < 0))
574 return val;
575 if (val & MAX16065_CURR_ENABLE) {
576 /*
577 * Current gain is 6, 12, 24, 48 based on values in
578 * bit 2,3.
579 */
580 data->curr_gain = 6 << ((val >> 2) & 0x03);
581 data->range[MAX16065_NUM_ADC]
582 = max16065_csp_adc_range[(val >> 1) & 0x01];
583 data->groups[groups++] = &max16065_current_group;
584 } else {
585 data->have_current = false;
586 }
587 }
588
589 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
590 data, data->groups);
591 return PTR_ERR_OR_ZERO(hwmon_dev);
592}
593
594static const struct i2c_device_id max16065_id[] = {
595 { "max16065", max16065 },
596 { "max16066", max16066 },
597 { "max16067", max16067 },
598 { "max16068", max16068 },
599 { "max16070", max16070 },
600 { "max16071", max16071 },
601 { }
602};
603
604MODULE_DEVICE_TABLE(i2c, max16065_id);
605
606/* This is the driver that will be inserted */
607static struct i2c_driver max16065_driver = {
608 .driver = {
609 .name = "max16065",
610 },
611 .probe = max16065_probe,
612 .id_table = max16065_id,
613};
614
615module_i2c_driver(max16065_driver);
616
617MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
618MODULE_DESCRIPTION("MAX16065 driver");
619MODULE_LICENSE("GPL");