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. */
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(int mv,int range)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
ADC_TO_CURR(int adc,int gain)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 */
max16065_read_adc(struct i2c_client * client,int reg)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
max16065_update_device(struct device * dev)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
max16065_alarm_show(struct device * dev,struct device_attribute * da,char * buf)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
max16065_input_show(struct device * dev,struct device_attribute * da,char * buf)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
max16065_current_show(struct device * dev,struct device_attribute * da,char * buf)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
max16065_limit_store(struct device * dev,struct device_attribute * da,const char * buf,size_t count)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
max16065_limit_show(struct device * dev,struct device_attribute * da,char * buf)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
max16065_basic_is_visible(struct kobject * kobj,struct attribute * a,int n)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
max16065_secondary_is_visible(struct kobject * kobj,struct attribute * a,int index)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
max16065_probe(struct i2c_client * client)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
