drivers/hwmon/max16065.c

   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 clamp_val(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 <linux@roeck-us.net>");
 695 MODULE_DESCRIPTION("MAX16065 driver");
 696 MODULE_LICENSE("GPL");