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max16065.c
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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 device *hwmon_dev;
87  struct mutex update_lock;
88  bool valid;
89  unsigned long last_updated; /* in jiffies */
90  int num_adc;
91  bool have_current;
92  int curr_gain;
93  /* limits are in mV */
94  int limit[MAX16065_NUM_LIMIT][MAX16065_NUM_ADC];
95  int range[MAX16065_NUM_ADC + 1];/* voltage range */
96  int adc[MAX16065_NUM_ADC + 1]; /* adc values (raw) including csp_adc */
97  int curr_sense;
98  int fault[2];
99 };
100 
101 static const int max16065_adc_range[] = { 5560, 2780, 1390, 0 };
102 static const int max16065_csp_adc_range[] = { 7000, 14000 };
103 
104 /* ADC registers have 10 bit resolution. */
105 static inline int ADC_TO_MV(int adc, int range)
106 {
107  return (adc * range) / 1024;
108 }
109 
110 /*
111  * Limit registers have 8 bit resolution and match upper 8 bits of ADC
112  * registers.
113  */
114 static inline int LIMIT_TO_MV(int limit, int range)
115 {
116  return limit * range / 256;
117 }
118 
119 static inline int MV_TO_LIMIT(int mv, int range)
120 {
121  return SENSORS_LIMIT(DIV_ROUND_CLOSEST(mv * 256, range), 0, 255);
122 }
123 
124 static inline int ADC_TO_CURR(int adc, int gain)
125 {
126  return adc * 1400000 / (gain * 255);
127 }
128 
129 /*
130  * max16065_read_adc()
131  *
132  * Read 16 bit value from <reg>, <reg+1>.
133  * Upper 8 bits are in <reg>, lower 2 bits are in bits 7:6 of <reg+1>.
134  */
135 static int max16065_read_adc(struct i2c_client *client, int reg)
136 {
137  int rv;
138 
139  rv = i2c_smbus_read_word_swapped(client, reg);
140  if (unlikely(rv < 0))
141  return rv;
142  return rv >> 6;
143 }
144 
145 static struct max16065_data *max16065_update_device(struct device *dev)
146 {
147  struct i2c_client *client = to_i2c_client(dev);
148  struct max16065_data *data = i2c_get_clientdata(client);
149 
150  mutex_lock(&data->update_lock);
151  if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
152  int i;
153 
154  for (i = 0; i < data->num_adc; i++)
155  data->adc[i]
156  = max16065_read_adc(client, MAX16065_ADC(i));
157 
158  if (data->have_current) {
159  data->adc[MAX16065_NUM_ADC]
160  = max16065_read_adc(client, MAX16065_CSP_ADC);
161  data->curr_sense
162  = i2c_smbus_read_byte_data(client,
163  MAX16065_CURR_SENSE);
164  }
165 
166  for (i = 0; i < DIV_ROUND_UP(data->num_adc, 8); i++)
167  data->fault[i]
168  = i2c_smbus_read_byte_data(client, MAX16065_FAULT(i));
169 
170  data->last_updated = jiffies;
171  data->valid = 1;
172  }
173  mutex_unlock(&data->update_lock);
174  return data;
175 }
176 
177 static ssize_t max16065_show_alarm(struct device *dev,
178  struct device_attribute *da, char *buf)
179 {
180  struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da);
181  struct max16065_data *data = max16065_update_device(dev);
182  int val = data->fault[attr2->nr];
183 
184  if (val < 0)
185  return val;
186 
187  val &= (1 << attr2->index);
188  if (val)
189  i2c_smbus_write_byte_data(to_i2c_client(dev),
190  MAX16065_FAULT(attr2->nr), val);
191 
192  return snprintf(buf, PAGE_SIZE, "%d\n", !!val);
193 }
194 
195 static ssize_t max16065_show_input(struct device *dev,
196  struct device_attribute *da, char *buf)
197 {
198  struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
199  struct max16065_data *data = max16065_update_device(dev);
200  int adc = data->adc[attr->index];
201 
202  if (unlikely(adc < 0))
203  return adc;
204 
205  return snprintf(buf, PAGE_SIZE, "%d\n",
206  ADC_TO_MV(adc, data->range[attr->index]));
207 }
208 
209 static ssize_t max16065_show_current(struct device *dev,
210  struct device_attribute *da, char *buf)
211 {
212  struct max16065_data *data = max16065_update_device(dev);
213 
214  if (unlikely(data->curr_sense < 0))
215  return data->curr_sense;
216 
217  return snprintf(buf, PAGE_SIZE, "%d\n",
218  ADC_TO_CURR(data->curr_sense, data->curr_gain));
219 }
220 
221 static ssize_t max16065_set_limit(struct device *dev,
222  struct device_attribute *da,
223  const char *buf, size_t count)
224 {
225  struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da);
226  struct i2c_client *client = to_i2c_client(dev);
227  struct max16065_data *data = i2c_get_clientdata(client);
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(client,
242  MAX16065_LIMIT(attr2->nr, attr2->index),
243  limit);
244  mutex_unlock(&data->update_lock);
245 
246  return count;
247 }
248 
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 i2c_client *client = to_i2c_client(dev);
254  struct max16065_data *data = i2c_get_clientdata(client);
255 
256  return snprintf(buf, PAGE_SIZE, "%d\n",
257  data->limit[attr2->nr][attr2->index]);
258 }
259 
260 /* Construct a sensor_device_attribute structure for each register */
261 
262 /* Input voltages */
263 static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, max16065_show_input, NULL, 0);
264 static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, max16065_show_input, NULL, 1);
265 static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, max16065_show_input, NULL, 2);
266 static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, max16065_show_input, NULL, 3);
267 static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, max16065_show_input, NULL, 4);
268 static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, max16065_show_input, NULL, 5);
269 static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, max16065_show_input, NULL, 6);
270 static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, max16065_show_input, NULL, 7);
271 static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, max16065_show_input, NULL, 8);
272 static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, max16065_show_input, NULL, 9);
273 static SENSOR_DEVICE_ATTR(in10_input, S_IRUGO, max16065_show_input, NULL, 10);
274 static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, max16065_show_input, NULL, 11);
275 static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, max16065_show_input, NULL, 12);
276 
277 /* Input voltages lcrit */
278 static SENSOR_DEVICE_ATTR_2(in0_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
279  max16065_set_limit, 2, 0);
280 static SENSOR_DEVICE_ATTR_2(in1_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
281  max16065_set_limit, 2, 1);
282 static SENSOR_DEVICE_ATTR_2(in2_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
283  max16065_set_limit, 2, 2);
284 static SENSOR_DEVICE_ATTR_2(in3_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
285  max16065_set_limit, 2, 3);
286 static SENSOR_DEVICE_ATTR_2(in4_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
287  max16065_set_limit, 2, 4);
288 static SENSOR_DEVICE_ATTR_2(in5_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
289  max16065_set_limit, 2, 5);
290 static SENSOR_DEVICE_ATTR_2(in6_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
291  max16065_set_limit, 2, 6);
292 static SENSOR_DEVICE_ATTR_2(in7_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
293  max16065_set_limit, 2, 7);
294 static SENSOR_DEVICE_ATTR_2(in8_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
295  max16065_set_limit, 2, 8);
296 static SENSOR_DEVICE_ATTR_2(in9_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
297  max16065_set_limit, 2, 9);
298 static SENSOR_DEVICE_ATTR_2(in10_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
299  max16065_set_limit, 2, 10);
300 static SENSOR_DEVICE_ATTR_2(in11_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
301  max16065_set_limit, 2, 11);
302 
303 /* Input voltages crit */
304 static SENSOR_DEVICE_ATTR_2(in0_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
305  max16065_set_limit, 1, 0);
306 static SENSOR_DEVICE_ATTR_2(in1_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
307  max16065_set_limit, 1, 1);
308 static SENSOR_DEVICE_ATTR_2(in2_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
309  max16065_set_limit, 1, 2);
310 static SENSOR_DEVICE_ATTR_2(in3_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
311  max16065_set_limit, 1, 3);
312 static SENSOR_DEVICE_ATTR_2(in4_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
313  max16065_set_limit, 1, 4);
314 static SENSOR_DEVICE_ATTR_2(in5_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
315  max16065_set_limit, 1, 5);
316 static SENSOR_DEVICE_ATTR_2(in6_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
317  max16065_set_limit, 1, 6);
318 static SENSOR_DEVICE_ATTR_2(in7_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
319  max16065_set_limit, 1, 7);
320 static SENSOR_DEVICE_ATTR_2(in8_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
321  max16065_set_limit, 1, 8);
322 static SENSOR_DEVICE_ATTR_2(in9_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
323  max16065_set_limit, 1, 9);
324 static SENSOR_DEVICE_ATTR_2(in10_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
325  max16065_set_limit, 1, 10);
326 static SENSOR_DEVICE_ATTR_2(in11_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
327  max16065_set_limit, 1, 11);
328 
329 /* Input voltages min */
330 static SENSOR_DEVICE_ATTR_2(in0_min, S_IWUSR | S_IRUGO, max16065_show_limit,
331  max16065_set_limit, 0, 0);
332 static SENSOR_DEVICE_ATTR_2(in1_min, S_IWUSR | S_IRUGO, max16065_show_limit,
333  max16065_set_limit, 0, 1);
334 static SENSOR_DEVICE_ATTR_2(in2_min, S_IWUSR | S_IRUGO, max16065_show_limit,
335  max16065_set_limit, 0, 2);
336 static SENSOR_DEVICE_ATTR_2(in3_min, S_IWUSR | S_IRUGO, max16065_show_limit,
337  max16065_set_limit, 0, 3);
338 static SENSOR_DEVICE_ATTR_2(in4_min, S_IWUSR | S_IRUGO, max16065_show_limit,
339  max16065_set_limit, 0, 4);
340 static SENSOR_DEVICE_ATTR_2(in5_min, S_IWUSR | S_IRUGO, max16065_show_limit,
341  max16065_set_limit, 0, 5);
342 static SENSOR_DEVICE_ATTR_2(in6_min, S_IWUSR | S_IRUGO, max16065_show_limit,
343  max16065_set_limit, 0, 6);
344 static SENSOR_DEVICE_ATTR_2(in7_min, S_IWUSR | S_IRUGO, max16065_show_limit,
345  max16065_set_limit, 0, 7);
346 static SENSOR_DEVICE_ATTR_2(in8_min, S_IWUSR | S_IRUGO, max16065_show_limit,
347  max16065_set_limit, 0, 8);
348 static SENSOR_DEVICE_ATTR_2(in9_min, S_IWUSR | S_IRUGO, max16065_show_limit,
349  max16065_set_limit, 0, 9);
350 static SENSOR_DEVICE_ATTR_2(in10_min, S_IWUSR | S_IRUGO, max16065_show_limit,
351  max16065_set_limit, 0, 10);
352 static SENSOR_DEVICE_ATTR_2(in11_min, S_IWUSR | S_IRUGO, max16065_show_limit,
353  max16065_set_limit, 0, 11);
354 
355 /* Input voltages max */
356 static SENSOR_DEVICE_ATTR_2(in0_max, S_IWUSR | S_IRUGO, max16065_show_limit,
357  max16065_set_limit, 0, 0);
358 static SENSOR_DEVICE_ATTR_2(in1_max, S_IWUSR | S_IRUGO, max16065_show_limit,
359  max16065_set_limit, 0, 1);
360 static SENSOR_DEVICE_ATTR_2(in2_max, S_IWUSR | S_IRUGO, max16065_show_limit,
361  max16065_set_limit, 0, 2);
362 static SENSOR_DEVICE_ATTR_2(in3_max, S_IWUSR | S_IRUGO, max16065_show_limit,
363  max16065_set_limit, 0, 3);
364 static SENSOR_DEVICE_ATTR_2(in4_max, S_IWUSR | S_IRUGO, max16065_show_limit,
365  max16065_set_limit, 0, 4);
366 static SENSOR_DEVICE_ATTR_2(in5_max, S_IWUSR | S_IRUGO, max16065_show_limit,
367  max16065_set_limit, 0, 5);
368 static SENSOR_DEVICE_ATTR_2(in6_max, S_IWUSR | S_IRUGO, max16065_show_limit,
369  max16065_set_limit, 0, 6);
370 static SENSOR_DEVICE_ATTR_2(in7_max, S_IWUSR | S_IRUGO, max16065_show_limit,
371  max16065_set_limit, 0, 7);
372 static SENSOR_DEVICE_ATTR_2(in8_max, S_IWUSR | S_IRUGO, max16065_show_limit,
373  max16065_set_limit, 0, 8);
374 static SENSOR_DEVICE_ATTR_2(in9_max, S_IWUSR | S_IRUGO, max16065_show_limit,
375  max16065_set_limit, 0, 9);
376 static SENSOR_DEVICE_ATTR_2(in10_max, S_IWUSR | S_IRUGO, max16065_show_limit,
377  max16065_set_limit, 0, 10);
378 static SENSOR_DEVICE_ATTR_2(in11_max, S_IWUSR | S_IRUGO, max16065_show_limit,
379  max16065_set_limit, 0, 11);
380 
381 /* alarms */
382 static SENSOR_DEVICE_ATTR_2(in0_alarm, S_IRUGO, max16065_show_alarm, NULL,
383  0, 0);
384 static SENSOR_DEVICE_ATTR_2(in1_alarm, S_IRUGO, max16065_show_alarm, NULL,
385  0, 1);
386 static SENSOR_DEVICE_ATTR_2(in2_alarm, S_IRUGO, max16065_show_alarm, NULL,
387  0, 2);
388 static SENSOR_DEVICE_ATTR_2(in3_alarm, S_IRUGO, max16065_show_alarm, NULL,
389  0, 3);
390 static SENSOR_DEVICE_ATTR_2(in4_alarm, S_IRUGO, max16065_show_alarm, NULL,
391  0, 4);
392 static SENSOR_DEVICE_ATTR_2(in5_alarm, S_IRUGO, max16065_show_alarm, NULL,
393  0, 5);
394 static SENSOR_DEVICE_ATTR_2(in6_alarm, S_IRUGO, max16065_show_alarm, NULL,
395  0, 6);
396 static SENSOR_DEVICE_ATTR_2(in7_alarm, S_IRUGO, max16065_show_alarm, NULL,
397  0, 7);
398 static SENSOR_DEVICE_ATTR_2(in8_alarm, S_IRUGO, max16065_show_alarm, NULL,
399  1, 0);
400 static SENSOR_DEVICE_ATTR_2(in9_alarm, S_IRUGO, max16065_show_alarm, NULL,
401  1, 1);
402 static SENSOR_DEVICE_ATTR_2(in10_alarm, S_IRUGO, max16065_show_alarm, NULL,
403  1, 2);
404 static SENSOR_DEVICE_ATTR_2(in11_alarm, S_IRUGO, max16065_show_alarm, NULL,
405  1, 3);
406 
407 /* Current and alarm */
408 static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, max16065_show_current, NULL, 0);
409 static SENSOR_DEVICE_ATTR_2(curr1_alarm, S_IRUGO, max16065_show_alarm, NULL,
410  1, 4);
411 
412 /*
413  * Finally, construct an array of pointers to members of the above objects,
414  * as required for sysfs_create_group()
415  */
416 static struct attribute *max16065_basic_attributes[] = {
417  &sensor_dev_attr_in0_input.dev_attr.attr,
418  &sensor_dev_attr_in0_lcrit.dev_attr.attr,
419  &sensor_dev_attr_in0_crit.dev_attr.attr,
420  &sensor_dev_attr_in0_alarm.dev_attr.attr,
421 
422  &sensor_dev_attr_in1_input.dev_attr.attr,
423  &sensor_dev_attr_in1_lcrit.dev_attr.attr,
424  &sensor_dev_attr_in1_crit.dev_attr.attr,
425  &sensor_dev_attr_in1_alarm.dev_attr.attr,
426 
427  &sensor_dev_attr_in2_input.dev_attr.attr,
428  &sensor_dev_attr_in2_lcrit.dev_attr.attr,
429  &sensor_dev_attr_in2_crit.dev_attr.attr,
430  &sensor_dev_attr_in2_alarm.dev_attr.attr,
431 
432  &sensor_dev_attr_in3_input.dev_attr.attr,
433  &sensor_dev_attr_in3_lcrit.dev_attr.attr,
434  &sensor_dev_attr_in3_crit.dev_attr.attr,
435  &sensor_dev_attr_in3_alarm.dev_attr.attr,
436 
437  &sensor_dev_attr_in4_input.dev_attr.attr,
438  &sensor_dev_attr_in4_lcrit.dev_attr.attr,
439  &sensor_dev_attr_in4_crit.dev_attr.attr,
440  &sensor_dev_attr_in4_alarm.dev_attr.attr,
441 
442  &sensor_dev_attr_in5_input.dev_attr.attr,
443  &sensor_dev_attr_in5_lcrit.dev_attr.attr,
444  &sensor_dev_attr_in5_crit.dev_attr.attr,
445  &sensor_dev_attr_in5_alarm.dev_attr.attr,
446 
447  &sensor_dev_attr_in6_input.dev_attr.attr,
448  &sensor_dev_attr_in6_lcrit.dev_attr.attr,
449  &sensor_dev_attr_in6_crit.dev_attr.attr,
450  &sensor_dev_attr_in6_alarm.dev_attr.attr,
451 
452  &sensor_dev_attr_in7_input.dev_attr.attr,
453  &sensor_dev_attr_in7_lcrit.dev_attr.attr,
454  &sensor_dev_attr_in7_crit.dev_attr.attr,
455  &sensor_dev_attr_in7_alarm.dev_attr.attr,
456 
457  &sensor_dev_attr_in8_input.dev_attr.attr,
458  &sensor_dev_attr_in8_lcrit.dev_attr.attr,
459  &sensor_dev_attr_in8_crit.dev_attr.attr,
460  &sensor_dev_attr_in8_alarm.dev_attr.attr,
461 
462  &sensor_dev_attr_in9_input.dev_attr.attr,
463  &sensor_dev_attr_in9_lcrit.dev_attr.attr,
464  &sensor_dev_attr_in9_crit.dev_attr.attr,
465  &sensor_dev_attr_in9_alarm.dev_attr.attr,
466 
467  &sensor_dev_attr_in10_input.dev_attr.attr,
468  &sensor_dev_attr_in10_lcrit.dev_attr.attr,
469  &sensor_dev_attr_in10_crit.dev_attr.attr,
470  &sensor_dev_attr_in10_alarm.dev_attr.attr,
471 
472  &sensor_dev_attr_in11_input.dev_attr.attr,
473  &sensor_dev_attr_in11_lcrit.dev_attr.attr,
474  &sensor_dev_attr_in11_crit.dev_attr.attr,
475  &sensor_dev_attr_in11_alarm.dev_attr.attr,
476 
477  NULL
478 };
479 
480 static struct attribute *max16065_current_attributes[] = {
481  &sensor_dev_attr_in12_input.dev_attr.attr,
482  &sensor_dev_attr_curr1_input.dev_attr.attr,
483  &sensor_dev_attr_curr1_alarm.dev_attr.attr,
484  NULL
485 };
486 
487 static struct attribute *max16065_min_attributes[] = {
488  &sensor_dev_attr_in0_min.dev_attr.attr,
489  &sensor_dev_attr_in1_min.dev_attr.attr,
490  &sensor_dev_attr_in2_min.dev_attr.attr,
491  &sensor_dev_attr_in3_min.dev_attr.attr,
492  &sensor_dev_attr_in4_min.dev_attr.attr,
493  &sensor_dev_attr_in5_min.dev_attr.attr,
494  &sensor_dev_attr_in6_min.dev_attr.attr,
495  &sensor_dev_attr_in7_min.dev_attr.attr,
496  &sensor_dev_attr_in8_min.dev_attr.attr,
497  &sensor_dev_attr_in9_min.dev_attr.attr,
498  &sensor_dev_attr_in10_min.dev_attr.attr,
499  &sensor_dev_attr_in11_min.dev_attr.attr,
500  NULL
501 };
502 
503 static struct attribute *max16065_max_attributes[] = {
504  &sensor_dev_attr_in0_max.dev_attr.attr,
505  &sensor_dev_attr_in1_max.dev_attr.attr,
506  &sensor_dev_attr_in2_max.dev_attr.attr,
507  &sensor_dev_attr_in3_max.dev_attr.attr,
508  &sensor_dev_attr_in4_max.dev_attr.attr,
509  &sensor_dev_attr_in5_max.dev_attr.attr,
510  &sensor_dev_attr_in6_max.dev_attr.attr,
511  &sensor_dev_attr_in7_max.dev_attr.attr,
512  &sensor_dev_attr_in8_max.dev_attr.attr,
513  &sensor_dev_attr_in9_max.dev_attr.attr,
514  &sensor_dev_attr_in10_max.dev_attr.attr,
515  &sensor_dev_attr_in11_max.dev_attr.attr,
516  NULL
517 };
518 
519 static const struct attribute_group max16065_basic_group = {
520  .attrs = max16065_basic_attributes,
521 };
522 
523 static const struct attribute_group max16065_current_group = {
524  .attrs = max16065_current_attributes,
525 };
526 
527 static const struct attribute_group max16065_min_group = {
528  .attrs = max16065_min_attributes,
529 };
530 
531 static const struct attribute_group max16065_max_group = {
532  .attrs = max16065_max_attributes,
533 };
534 
535 static void max16065_cleanup(struct i2c_client *client)
536 {
537  sysfs_remove_group(&client->dev.kobj, &max16065_max_group);
538  sysfs_remove_group(&client->dev.kobj, &max16065_min_group);
539  sysfs_remove_group(&client->dev.kobj, &max16065_current_group);
540  sysfs_remove_group(&client->dev.kobj, &max16065_basic_group);
541 }
542 
543 static int max16065_probe(struct i2c_client *client,
544  const struct i2c_device_id *id)
545 {
546  struct i2c_adapter *adapter = client->adapter;
547  struct max16065_data *data;
548  int i, j, val, ret;
549  bool have_secondary; /* true if chip has secondary limits */
550  bool secondary_is_max = false; /* secondary limits reflect max */
551 
552  if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
553  | I2C_FUNC_SMBUS_READ_WORD_DATA))
554  return -ENODEV;
555 
556  data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
557  if (unlikely(!data))
558  return -ENOMEM;
559 
560  i2c_set_clientdata(client, data);
561  mutex_init(&data->update_lock);
562 
563  data->num_adc = max16065_num_adc[id->driver_data];
564  data->have_current = max16065_have_current[id->driver_data];
565  have_secondary = max16065_have_secondary[id->driver_data];
566 
567  if (have_secondary) {
568  val = i2c_smbus_read_byte_data(client, MAX16065_SW_ENABLE);
569  if (unlikely(val < 0))
570  return val;
571  secondary_is_max = val & MAX16065_WARNING_OV;
572  }
573 
574  /* Read scale registers, convert to range */
575  for (i = 0; i < DIV_ROUND_UP(data->num_adc, 4); i++) {
576  val = i2c_smbus_read_byte_data(client, MAX16065_SCALE(i));
577  if (unlikely(val < 0))
578  return val;
579  for (j = 0; j < 4 && i * 4 + j < data->num_adc; j++) {
580  data->range[i * 4 + j] =
581  max16065_adc_range[(val >> (j * 2)) & 0x3];
582  }
583  }
584 
585  /* Read limits */
586  for (i = 0; i < MAX16065_NUM_LIMIT; i++) {
587  if (i == 0 && !have_secondary)
588  continue;
589 
590  for (j = 0; j < data->num_adc; j++) {
591  val = i2c_smbus_read_byte_data(client,
592  MAX16065_LIMIT(i, j));
593  if (unlikely(val < 0))
594  return val;
595  data->limit[i][j] = LIMIT_TO_MV(val, data->range[j]);
596  }
597  }
598 
599  /* Register sysfs hooks */
600  for (i = 0; i < data->num_adc * 4; i++) {
601  /* Do not create sysfs entry if channel is disabled */
602  if (!data->range[i / 4])
603  continue;
604 
605  ret = sysfs_create_file(&client->dev.kobj,
606  max16065_basic_attributes[i]);
607  if (unlikely(ret))
608  goto out;
609  }
610 
611  if (have_secondary) {
612  struct attribute **attr = secondary_is_max ?
613  max16065_max_attributes : max16065_min_attributes;
614 
615  for (i = 0; i < data->num_adc; i++) {
616  if (!data->range[i])
617  continue;
618 
619  ret = sysfs_create_file(&client->dev.kobj, attr[i]);
620  if (unlikely(ret))
621  goto out;
622  }
623  }
624 
625  if (data->have_current) {
626  val = i2c_smbus_read_byte_data(client, MAX16065_CURR_CONTROL);
627  if (unlikely(val < 0)) {
628  ret = val;
629  goto out;
630  }
631  if (val & MAX16065_CURR_ENABLE) {
632  /*
633  * Current gain is 6, 12, 24, 48 based on values in
634  * bit 2,3.
635  */
636  data->curr_gain = 6 << ((val >> 2) & 0x03);
637  data->range[MAX16065_NUM_ADC]
638  = max16065_csp_adc_range[(val >> 1) & 0x01];
639  ret = sysfs_create_group(&client->dev.kobj,
640  &max16065_current_group);
641  if (unlikely(ret))
642  goto out;
643  } else {
644  data->have_current = false;
645  }
646  }
647 
648  data->hwmon_dev = hwmon_device_register(&client->dev);
649  if (unlikely(IS_ERR(data->hwmon_dev))) {
650  ret = PTR_ERR(data->hwmon_dev);
651  goto out;
652  }
653  return 0;
654 
655 out:
656  max16065_cleanup(client);
657  return ret;
658 }
659 
660 static int max16065_remove(struct i2c_client *client)
661 {
662  struct max16065_data *data = i2c_get_clientdata(client);
663 
664  hwmon_device_unregister(data->hwmon_dev);
665  max16065_cleanup(client);
666 
667  return 0;
668 }
669 
670 static const struct i2c_device_id max16065_id[] = {
671  { "max16065", max16065 },
672  { "max16066", max16066 },
673  { "max16067", max16067 },
674  { "max16068", max16068 },
675  { "max16070", max16070 },
676  { "max16071", max16071 },
677  { }
678 };
679 
680 MODULE_DEVICE_TABLE(i2c, max16065_id);
681 
682 /* This is the driver that will be inserted */
683 static struct i2c_driver max16065_driver = {
684  .driver = {
685  .name = "max16065",
686  },
687  .probe = max16065_probe,
688  .remove = max16065_remove,
689  .id_table = max16065_id,
690 };
691 
692 module_i2c_driver(max16065_driver);
693 
694 MODULE_AUTHOR("Guenter Roeck <[email protected]>");
695 MODULE_DESCRIPTION("MAX16065 driver");
696 MODULE_LICENSE("GPL");
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