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
27 enum 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
57 static 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
66 static 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
75 static 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
84 struct 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
102 static const int max16065_adc_range[] = { 5560, 2780, 1390, 0 };
103 static const int max16065_csp_adc_range[] = { 7000, 14000 };
104
105 /* ADC registers have 10 bit resolution. */
ADC_TO_MV(int adc,int range)106 static 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 */
LIMIT_TO_MV(int limit,int range)115 static inline int LIMIT_TO_MV(int limit, int range)
116 {
117 return limit * range / 256;
118 }
119
MV_TO_LIMIT(int mv,int range)120 static inline int MV_TO_LIMIT(int mv, int range)
121 {
122 return clamp_val(DIV_ROUND_CLOSEST(mv * 256, range), 0, 255);
123 }
124
ADC_TO_CURR(int adc,int gain)125 static 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 */
max16065_read_adc(struct i2c_client * client,int reg)136 static 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
max16065_update_device(struct device * dev)146 static 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
max16065_show_alarm(struct device * dev,struct device_attribute * da,char * buf)178 static ssize_t max16065_show_alarm(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
max16065_show_input(struct device * dev,struct device_attribute * da,char * buf)196 static ssize_t max16065_show_input(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
max16065_show_current(struct device * dev,struct device_attribute * da,char * buf)210 static ssize_t max16065_show_current(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
max16065_set_limit(struct device * dev,struct device_attribute * da,const char * buf,size_t count)222 static ssize_t max16065_set_limit(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
max16065_show_limit(struct device * dev,struct device_attribute * da,char * buf)249 static ssize_t max16065_show_limit(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 */
262 static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, max16065_show_input, NULL, 0);
263 static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, max16065_show_input, NULL, 1);
264 static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, max16065_show_input, NULL, 2);
265 static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, max16065_show_input, NULL, 3);
266 static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, max16065_show_input, NULL, 4);
267 static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, max16065_show_input, NULL, 5);
268 static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, max16065_show_input, NULL, 6);
269 static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, max16065_show_input, NULL, 7);
270 static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, max16065_show_input, NULL, 8);
271 static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, max16065_show_input, NULL, 9);
272 static SENSOR_DEVICE_ATTR(in10_input, S_IRUGO, max16065_show_input, NULL, 10);
273 static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, max16065_show_input, NULL, 11);
274 static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, max16065_show_input, NULL, 12);
275
276 /* Input voltages lcrit */
277 static SENSOR_DEVICE_ATTR_2(in0_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
278 max16065_set_limit, 2, 0);
279 static SENSOR_DEVICE_ATTR_2(in1_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
280 max16065_set_limit, 2, 1);
281 static SENSOR_DEVICE_ATTR_2(in2_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
282 max16065_set_limit, 2, 2);
283 static SENSOR_DEVICE_ATTR_2(in3_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
284 max16065_set_limit, 2, 3);
285 static SENSOR_DEVICE_ATTR_2(in4_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
286 max16065_set_limit, 2, 4);
287 static SENSOR_DEVICE_ATTR_2(in5_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
288 max16065_set_limit, 2, 5);
289 static SENSOR_DEVICE_ATTR_2(in6_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
290 max16065_set_limit, 2, 6);
291 static SENSOR_DEVICE_ATTR_2(in7_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
292 max16065_set_limit, 2, 7);
293 static SENSOR_DEVICE_ATTR_2(in8_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
294 max16065_set_limit, 2, 8);
295 static SENSOR_DEVICE_ATTR_2(in9_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
296 max16065_set_limit, 2, 9);
297 static SENSOR_DEVICE_ATTR_2(in10_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
298 max16065_set_limit, 2, 10);
299 static SENSOR_DEVICE_ATTR_2(in11_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
300 max16065_set_limit, 2, 11);
301
302 /* Input voltages crit */
303 static SENSOR_DEVICE_ATTR_2(in0_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
304 max16065_set_limit, 1, 0);
305 static SENSOR_DEVICE_ATTR_2(in1_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
306 max16065_set_limit, 1, 1);
307 static SENSOR_DEVICE_ATTR_2(in2_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
308 max16065_set_limit, 1, 2);
309 static SENSOR_DEVICE_ATTR_2(in3_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
310 max16065_set_limit, 1, 3);
311 static SENSOR_DEVICE_ATTR_2(in4_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
312 max16065_set_limit, 1, 4);
313 static SENSOR_DEVICE_ATTR_2(in5_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
314 max16065_set_limit, 1, 5);
315 static SENSOR_DEVICE_ATTR_2(in6_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
316 max16065_set_limit, 1, 6);
317 static SENSOR_DEVICE_ATTR_2(in7_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
318 max16065_set_limit, 1, 7);
319 static SENSOR_DEVICE_ATTR_2(in8_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
320 max16065_set_limit, 1, 8);
321 static SENSOR_DEVICE_ATTR_2(in9_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
322 max16065_set_limit, 1, 9);
323 static SENSOR_DEVICE_ATTR_2(in10_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
324 max16065_set_limit, 1, 10);
325 static SENSOR_DEVICE_ATTR_2(in11_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
326 max16065_set_limit, 1, 11);
327
328 /* Input voltages min */
329 static SENSOR_DEVICE_ATTR_2(in0_min, S_IWUSR | S_IRUGO, max16065_show_limit,
330 max16065_set_limit, 0, 0);
331 static SENSOR_DEVICE_ATTR_2(in1_min, S_IWUSR | S_IRUGO, max16065_show_limit,
332 max16065_set_limit, 0, 1);
333 static SENSOR_DEVICE_ATTR_2(in2_min, S_IWUSR | S_IRUGO, max16065_show_limit,
334 max16065_set_limit, 0, 2);
335 static SENSOR_DEVICE_ATTR_2(in3_min, S_IWUSR | S_IRUGO, max16065_show_limit,
336 max16065_set_limit, 0, 3);
337 static SENSOR_DEVICE_ATTR_2(in4_min, S_IWUSR | S_IRUGO, max16065_show_limit,
338 max16065_set_limit, 0, 4);
339 static SENSOR_DEVICE_ATTR_2(in5_min, S_IWUSR | S_IRUGO, max16065_show_limit,
340 max16065_set_limit, 0, 5);
341 static SENSOR_DEVICE_ATTR_2(in6_min, S_IWUSR | S_IRUGO, max16065_show_limit,
342 max16065_set_limit, 0, 6);
343 static SENSOR_DEVICE_ATTR_2(in7_min, S_IWUSR | S_IRUGO, max16065_show_limit,
344 max16065_set_limit, 0, 7);
345 static SENSOR_DEVICE_ATTR_2(in8_min, S_IWUSR | S_IRUGO, max16065_show_limit,
346 max16065_set_limit, 0, 8);
347 static SENSOR_DEVICE_ATTR_2(in9_min, S_IWUSR | S_IRUGO, max16065_show_limit,
348 max16065_set_limit, 0, 9);
349 static SENSOR_DEVICE_ATTR_2(in10_min, S_IWUSR | S_IRUGO, max16065_show_limit,
350 max16065_set_limit, 0, 10);
351 static SENSOR_DEVICE_ATTR_2(in11_min, S_IWUSR | S_IRUGO, max16065_show_limit,
352 max16065_set_limit, 0, 11);
353
354 /* Input voltages max */
355 static SENSOR_DEVICE_ATTR_2(in0_max, S_IWUSR | S_IRUGO, max16065_show_limit,
356 max16065_set_limit, 0, 0);
357 static SENSOR_DEVICE_ATTR_2(in1_max, S_IWUSR | S_IRUGO, max16065_show_limit,
358 max16065_set_limit, 0, 1);
359 static SENSOR_DEVICE_ATTR_2(in2_max, S_IWUSR | S_IRUGO, max16065_show_limit,
360 max16065_set_limit, 0, 2);
361 static SENSOR_DEVICE_ATTR_2(in3_max, S_IWUSR | S_IRUGO, max16065_show_limit,
362 max16065_set_limit, 0, 3);
363 static SENSOR_DEVICE_ATTR_2(in4_max, S_IWUSR | S_IRUGO, max16065_show_limit,
364 max16065_set_limit, 0, 4);
365 static SENSOR_DEVICE_ATTR_2(in5_max, S_IWUSR | S_IRUGO, max16065_show_limit,
366 max16065_set_limit, 0, 5);
367 static SENSOR_DEVICE_ATTR_2(in6_max, S_IWUSR | S_IRUGO, max16065_show_limit,
368 max16065_set_limit, 0, 6);
369 static SENSOR_DEVICE_ATTR_2(in7_max, S_IWUSR | S_IRUGO, max16065_show_limit,
370 max16065_set_limit, 0, 7);
371 static SENSOR_DEVICE_ATTR_2(in8_max, S_IWUSR | S_IRUGO, max16065_show_limit,
372 max16065_set_limit, 0, 8);
373 static SENSOR_DEVICE_ATTR_2(in9_max, S_IWUSR | S_IRUGO, max16065_show_limit,
374 max16065_set_limit, 0, 9);
375 static SENSOR_DEVICE_ATTR_2(in10_max, S_IWUSR | S_IRUGO, max16065_show_limit,
376 max16065_set_limit, 0, 10);
377 static SENSOR_DEVICE_ATTR_2(in11_max, S_IWUSR | S_IRUGO, max16065_show_limit,
378 max16065_set_limit, 0, 11);
379
380 /* alarms */
381 static SENSOR_DEVICE_ATTR_2(in0_alarm, S_IRUGO, max16065_show_alarm, NULL,
382 0, 0);
383 static SENSOR_DEVICE_ATTR_2(in1_alarm, S_IRUGO, max16065_show_alarm, NULL,
384 0, 1);
385 static SENSOR_DEVICE_ATTR_2(in2_alarm, S_IRUGO, max16065_show_alarm, NULL,
386 0, 2);
387 static SENSOR_DEVICE_ATTR_2(in3_alarm, S_IRUGO, max16065_show_alarm, NULL,
388 0, 3);
389 static SENSOR_DEVICE_ATTR_2(in4_alarm, S_IRUGO, max16065_show_alarm, NULL,
390 0, 4);
391 static SENSOR_DEVICE_ATTR_2(in5_alarm, S_IRUGO, max16065_show_alarm, NULL,
392 0, 5);
393 static SENSOR_DEVICE_ATTR_2(in6_alarm, S_IRUGO, max16065_show_alarm, NULL,
394 0, 6);
395 static SENSOR_DEVICE_ATTR_2(in7_alarm, S_IRUGO, max16065_show_alarm, NULL,
396 0, 7);
397 static SENSOR_DEVICE_ATTR_2(in8_alarm, S_IRUGO, max16065_show_alarm, NULL,
398 1, 0);
399 static SENSOR_DEVICE_ATTR_2(in9_alarm, S_IRUGO, max16065_show_alarm, NULL,
400 1, 1);
401 static SENSOR_DEVICE_ATTR_2(in10_alarm, S_IRUGO, max16065_show_alarm, NULL,
402 1, 2);
403 static SENSOR_DEVICE_ATTR_2(in11_alarm, S_IRUGO, max16065_show_alarm, NULL,
404 1, 3);
405
406 /* Current and alarm */
407 static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, max16065_show_current, NULL, 0);
408 static SENSOR_DEVICE_ATTR_2(curr1_alarm, S_IRUGO, max16065_show_alarm, NULL,
409 1, 4);
410
411 /*
412 * Finally, construct an array of pointers to members of the above objects,
413 * as required for sysfs_create_group()
414 */
415 static struct attribute *max16065_basic_attributes[] = {
416 &sensor_dev_attr_in0_input.dev_attr.attr,
417 &sensor_dev_attr_in0_lcrit.dev_attr.attr,
418 &sensor_dev_attr_in0_crit.dev_attr.attr,
419 &sensor_dev_attr_in0_alarm.dev_attr.attr,
420
421 &sensor_dev_attr_in1_input.dev_attr.attr,
422 &sensor_dev_attr_in1_lcrit.dev_attr.attr,
423 &sensor_dev_attr_in1_crit.dev_attr.attr,
424 &sensor_dev_attr_in1_alarm.dev_attr.attr,
425
426 &sensor_dev_attr_in2_input.dev_attr.attr,
427 &sensor_dev_attr_in2_lcrit.dev_attr.attr,
428 &sensor_dev_attr_in2_crit.dev_attr.attr,
429 &sensor_dev_attr_in2_alarm.dev_attr.attr,
430
431 &sensor_dev_attr_in3_input.dev_attr.attr,
432 &sensor_dev_attr_in3_lcrit.dev_attr.attr,
433 &sensor_dev_attr_in3_crit.dev_attr.attr,
434 &sensor_dev_attr_in3_alarm.dev_attr.attr,
435
436 &sensor_dev_attr_in4_input.dev_attr.attr,
437 &sensor_dev_attr_in4_lcrit.dev_attr.attr,
438 &sensor_dev_attr_in4_crit.dev_attr.attr,
439 &sensor_dev_attr_in4_alarm.dev_attr.attr,
440
441 &sensor_dev_attr_in5_input.dev_attr.attr,
442 &sensor_dev_attr_in5_lcrit.dev_attr.attr,
443 &sensor_dev_attr_in5_crit.dev_attr.attr,
444 &sensor_dev_attr_in5_alarm.dev_attr.attr,
445
446 &sensor_dev_attr_in6_input.dev_attr.attr,
447 &sensor_dev_attr_in6_lcrit.dev_attr.attr,
448 &sensor_dev_attr_in6_crit.dev_attr.attr,
449 &sensor_dev_attr_in6_alarm.dev_attr.attr,
450
451 &sensor_dev_attr_in7_input.dev_attr.attr,
452 &sensor_dev_attr_in7_lcrit.dev_attr.attr,
453 &sensor_dev_attr_in7_crit.dev_attr.attr,
454 &sensor_dev_attr_in7_alarm.dev_attr.attr,
455
456 &sensor_dev_attr_in8_input.dev_attr.attr,
457 &sensor_dev_attr_in8_lcrit.dev_attr.attr,
458 &sensor_dev_attr_in8_crit.dev_attr.attr,
459 &sensor_dev_attr_in8_alarm.dev_attr.attr,
460
461 &sensor_dev_attr_in9_input.dev_attr.attr,
462 &sensor_dev_attr_in9_lcrit.dev_attr.attr,
463 &sensor_dev_attr_in9_crit.dev_attr.attr,
464 &sensor_dev_attr_in9_alarm.dev_attr.attr,
465
466 &sensor_dev_attr_in10_input.dev_attr.attr,
467 &sensor_dev_attr_in10_lcrit.dev_attr.attr,
468 &sensor_dev_attr_in10_crit.dev_attr.attr,
469 &sensor_dev_attr_in10_alarm.dev_attr.attr,
470
471 &sensor_dev_attr_in11_input.dev_attr.attr,
472 &sensor_dev_attr_in11_lcrit.dev_attr.attr,
473 &sensor_dev_attr_in11_crit.dev_attr.attr,
474 &sensor_dev_attr_in11_alarm.dev_attr.attr,
475
476 NULL
477 };
478
479 static struct attribute *max16065_current_attributes[] = {
480 &sensor_dev_attr_in12_input.dev_attr.attr,
481 &sensor_dev_attr_curr1_input.dev_attr.attr,
482 &sensor_dev_attr_curr1_alarm.dev_attr.attr,
483 NULL
484 };
485
486 static struct attribute *max16065_min_attributes[] = {
487 &sensor_dev_attr_in0_min.dev_attr.attr,
488 &sensor_dev_attr_in1_min.dev_attr.attr,
489 &sensor_dev_attr_in2_min.dev_attr.attr,
490 &sensor_dev_attr_in3_min.dev_attr.attr,
491 &sensor_dev_attr_in4_min.dev_attr.attr,
492 &sensor_dev_attr_in5_min.dev_attr.attr,
493 &sensor_dev_attr_in6_min.dev_attr.attr,
494 &sensor_dev_attr_in7_min.dev_attr.attr,
495 &sensor_dev_attr_in8_min.dev_attr.attr,
496 &sensor_dev_attr_in9_min.dev_attr.attr,
497 &sensor_dev_attr_in10_min.dev_attr.attr,
498 &sensor_dev_attr_in11_min.dev_attr.attr,
499 NULL
500 };
501
502 static struct attribute *max16065_max_attributes[] = {
503 &sensor_dev_attr_in0_max.dev_attr.attr,
504 &sensor_dev_attr_in1_max.dev_attr.attr,
505 &sensor_dev_attr_in2_max.dev_attr.attr,
506 &sensor_dev_attr_in3_max.dev_attr.attr,
507 &sensor_dev_attr_in4_max.dev_attr.attr,
508 &sensor_dev_attr_in5_max.dev_attr.attr,
509 &sensor_dev_attr_in6_max.dev_attr.attr,
510 &sensor_dev_attr_in7_max.dev_attr.attr,
511 &sensor_dev_attr_in8_max.dev_attr.attr,
512 &sensor_dev_attr_in9_max.dev_attr.attr,
513 &sensor_dev_attr_in10_max.dev_attr.attr,
514 &sensor_dev_attr_in11_max.dev_attr.attr,
515 NULL
516 };
517
max16065_basic_is_visible(struct kobject * kobj,struct attribute * a,int n)518 static umode_t max16065_basic_is_visible(struct kobject *kobj,
519 struct attribute *a, int n)
520 {
521 struct device *dev = container_of(kobj, struct device, kobj);
522 struct max16065_data *data = dev_get_drvdata(dev);
523 int index = n / 4;
524
525 if (index >= data->num_adc || !data->range[index])
526 return 0;
527 return a->mode;
528 }
529
max16065_secondary_is_visible(struct kobject * kobj,struct attribute * a,int index)530 static umode_t max16065_secondary_is_visible(struct kobject *kobj,
531 struct attribute *a, int index)
532 {
533 struct device *dev = container_of(kobj, struct device, kobj);
534 struct max16065_data *data = dev_get_drvdata(dev);
535
536 if (index >= data->num_adc)
537 return 0;
538 return a->mode;
539 }
540
541 static const struct attribute_group max16065_basic_group = {
542 .attrs = max16065_basic_attributes,
543 .is_visible = max16065_basic_is_visible,
544 };
545
546 static const struct attribute_group max16065_current_group = {
547 .attrs = max16065_current_attributes,
548 };
549
550 static const struct attribute_group max16065_min_group = {
551 .attrs = max16065_min_attributes,
552 .is_visible = max16065_secondary_is_visible,
553 };
554
555 static const struct attribute_group max16065_max_group = {
556 .attrs = max16065_max_attributes,
557 .is_visible = max16065_secondary_is_visible,
558 };
559
max16065_probe(struct i2c_client * client,const struct i2c_device_id * id)560 static int max16065_probe(struct i2c_client *client,
561 const struct i2c_device_id *id)
562 {
563 struct i2c_adapter *adapter = client->adapter;
564 struct max16065_data *data;
565 struct device *dev = &client->dev;
566 struct device *hwmon_dev;
567 int i, j, val;
568 bool have_secondary; /* true if chip has secondary limits */
569 bool secondary_is_max = false; /* secondary limits reflect max */
570 int groups = 0;
571
572 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
573 | I2C_FUNC_SMBUS_READ_WORD_DATA))
574 return -ENODEV;
575
576 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
577 if (unlikely(!data))
578 return -ENOMEM;
579
580 data->client = client;
581 mutex_init(&data->update_lock);
582
583 data->num_adc = max16065_num_adc[id->driver_data];
584 data->have_current = max16065_have_current[id->driver_data];
585 have_secondary = max16065_have_secondary[id->driver_data];
586
587 if (have_secondary) {
588 val = i2c_smbus_read_byte_data(client, MAX16065_SW_ENABLE);
589 if (unlikely(val < 0))
590 return val;
591 secondary_is_max = val & MAX16065_WARNING_OV;
592 }
593
594 /* Read scale registers, convert to range */
595 for (i = 0; i < DIV_ROUND_UP(data->num_adc, 4); i++) {
596 val = i2c_smbus_read_byte_data(client, MAX16065_SCALE(i));
597 if (unlikely(val < 0))
598 return val;
599 for (j = 0; j < 4 && i * 4 + j < data->num_adc; j++) {
600 data->range[i * 4 + j] =
601 max16065_adc_range[(val >> (j * 2)) & 0x3];
602 }
603 }
604
605 /* Read limits */
606 for (i = 0; i < MAX16065_NUM_LIMIT; i++) {
607 if (i == 0 && !have_secondary)
608 continue;
609
610 for (j = 0; j < data->num_adc; j++) {
611 val = i2c_smbus_read_byte_data(client,
612 MAX16065_LIMIT(i, j));
613 if (unlikely(val < 0))
614 return val;
615 data->limit[i][j] = LIMIT_TO_MV(val, data->range[j]);
616 }
617 }
618
619 /* sysfs hooks */
620 data->groups[groups++] = &max16065_basic_group;
621 if (have_secondary)
622 data->groups[groups++] = secondary_is_max ?
623 &max16065_max_group : &max16065_min_group;
624
625 if (data->have_current) {
626 val = i2c_smbus_read_byte_data(client, MAX16065_CURR_CONTROL);
627 if (unlikely(val < 0))
628 return val;
629 if (val & MAX16065_CURR_ENABLE) {
630 /*
631 * Current gain is 6, 12, 24, 48 based on values in
632 * bit 2,3.
633 */
634 data->curr_gain = 6 << ((val >> 2) & 0x03);
635 data->range[MAX16065_NUM_ADC]
636 = max16065_csp_adc_range[(val >> 1) & 0x01];
637 data->groups[groups++] = &max16065_current_group;
638 } else {
639 data->have_current = false;
640 }
641 }
642
643 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
644 data, data->groups);
645 return PTR_ERR_OR_ZERO(hwmon_dev);
646 }
647
648 static const struct i2c_device_id max16065_id[] = {
649 { "max16065", max16065 },
650 { "max16066", max16066 },
651 { "max16067", max16067 },
652 { "max16068", max16068 },
653 { "max16070", max16070 },
654 { "max16071", max16071 },
655 { }
656 };
657
658 MODULE_DEVICE_TABLE(i2c, max16065_id);
659
660 /* This is the driver that will be inserted */
661 static struct i2c_driver max16065_driver = {
662 .driver = {
663 .name = "max16065",
664 },
665 .probe = max16065_probe,
666 .id_table = max16065_id,
667 };
668
669 module_i2c_driver(max16065_driver);
670
671 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
672 MODULE_DESCRIPTION("MAX16065 driver");
673 MODULE_LICENSE("GPL");
674
