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