drivers/hwmon/max16065.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Driver for
   4  *  Maxim MAX16065/MAX16066 12-Channel/8-Channel, Flash-Configurable
   5  *  System Managers with Nonvolatile Fault Registers
   6  *  Maxim MAX16067/MAX16068 6-Channel, Flash-Configurable System Managers
   7  *  with Nonvolatile Fault Registers
   8  *  Maxim MAX16070/MAX16071 12-Channel/8-Channel, Flash-Configurable System
   9  *  Monitors with Nonvolatile Fault Registers
  10  *
  11  * Copyright (C) 2011 Ericsson AB.
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/init.h>
  17 #include <linux/err.h>
  18 #include <linux/slab.h>
  19 #include <linux/i2c.h>
  20 #include <linux/hwmon.h>
  21 #include <linux/hwmon-sysfs.h>
  22 #include <linux/jiffies.h>
  23
  24 enum chips { max16065, max16066, max16067, max16068, max16070, max16071 };
  25
  26 /*
  27  * Registers
  28  */
  29 #define MAX16065_ADC(x)         ((x) * 2)
  30
  31 #define MAX16065_CURR_SENSE     0x18
  32 #define MAX16065_CSP_ADC        0x19
  33 #define MAX16065_FAULT(x)       (0x1b + (x))
  34 #define MAX16065_SCALE(x)       (0x43 + (x))
  35 #define MAX16065_CURR_CONTROL   0x47
  36 #define MAX16065_LIMIT(l, x)    (0x48 + (l) + (x) * 3)  /*
  37                                                          * l: limit
  38                                                          *  0: min/max
  39                                                          *  1: crit
  40                                                          *  2: lcrit
  41                                                          * x: ADC index
  42                                                          */
  43
  44 #define MAX16065_SW_ENABLE      0x73
  45
  46 #define MAX16065_WARNING_OV     (1 << 3) /* Set if secondary threshold is OV
  47                                             warning */
  48
  49 #define MAX16065_CURR_ENABLE    (1 << 0)
  50
  51 #define MAX16065_NUM_LIMIT      3
  52 #define MAX16065_NUM_ADC        12      /* maximum number of ADC channels */
  53
  54 static const int max16065_num_adc[] = {
  55         [max16065] = 12,
  56         [max16066] = 8,
  57         [max16067] = 6,
  58         [max16068] = 6,
  59         [max16070] = 12,
  60         [max16071] = 8,
  61 };
  62
  63 static const bool max16065_have_secondary[] = {
  64         [max16065] = true,
  65         [max16066] = true,
  66         [max16067] = false,
  67         [max16068] = false,
  68         [max16070] = true,
  69         [max16071] = true,
  70 };
  71
  72 static const bool max16065_have_current[] = {
  73         [max16065] = true,
  74         [max16066] = true,
  75         [max16067] = false,
  76         [max16068] = false,
  77         [max16070] = true,
  78         [max16071] = true,
  79 };
  80
  81 struct max16065_data {
  82         enum chips chip;
  83         struct i2c_client *client;
  84         const struct attribute_group *groups[4];
  85         struct mutex update_lock;
  86         bool valid;
  87         unsigned long last_updated; /* in jiffies */
  88         int num_adc;
  89         bool have_current;
  90         int curr_gain;
  91         /* limits are in mV */
  92         int limit[MAX16065_NUM_LIMIT][MAX16065_NUM_ADC];
  93         int range[MAX16065_NUM_ADC + 1];/* voltage range */
  94         int adc[MAX16065_NUM_ADC + 1];  /* adc values (raw) including csp_adc */
  95         int curr_sense;
  96         int fault[2];
  97 };
  98
  99 static const int max16065_adc_range[] = { 5560, 2780, 1390, 0 };
 100 static const int max16065_csp_adc_range[] = { 7000, 14000 };
 101
 102 /* ADC registers have 10 bit resolution. */
 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  */
 112 static inline int LIMIT_TO_MV(int limit, int range)
 113 {
 114         return limit * range / 256;
 115 }
 116
 117 static inline int MV_TO_LIMIT(unsigned long mv, int range)
 118 {
 119         mv = clamp_val(mv, 0, ULONG_MAX / 256);
 120         return DIV_ROUND_CLOSEST(clamp_val(mv * 256, 0, range * 255), range);
 121 }
 122
 123 static inline int ADC_TO_CURR(int adc, int gain)
 124 {
 125         return adc * 1400000 / (gain * 255);
 126 }
 127
 128 /*
 129  * max16065_read_adc()
 130  *
 131  * Read 16 bit value from <reg>, <reg+1>.
 132  * Upper 8 bits are in <reg>, lower 2 bits are in bits 7:6 of <reg+1>.
 133  */
 134 static int max16065_read_adc(struct i2c_client *client, int reg)
 135 {
 136         int rv;
 137
 138         rv = i2c_smbus_read_word_swapped(client, reg);
 139         if (unlikely(rv < 0))
 140                 return rv;
 141         return rv >> 6;
 142 }
 143
 144 static struct max16065_data *max16065_update_device(struct device *dev)
 145 {
 146         struct max16065_data *data = dev_get_drvdata(dev);
 147         struct i2c_client *client = data->client;
 148
 149         mutex_lock(&data->update_lock);
 150         if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 151                 int i;
 152
 153                 for (i = 0; i < data->num_adc; i++)
 154                         data->adc[i]
 155                           = max16065_read_adc(client, MAX16065_ADC(i));
 156
 157                 if (data->have_current) {
 158                         data->adc[MAX16065_NUM_ADC]
 159                           = max16065_read_adc(client, MAX16065_CSP_ADC);
 160                         data->curr_sense
 161                           = i2c_smbus_read_byte_data(client,
 162                                                      MAX16065_CURR_SENSE);
 163                 }
 164
 165                 for (i = 0; i < 2; i++)
 166                         data->fault[i]
 167                           = i2c_smbus_read_byte_data(client, MAX16065_FAULT(i));
 168
 169                 /*
 170                  * MAX16067 and MAX16068 have separate undervoltage and
 171                  * overvoltage alarm bits. Squash them together.
 172                  */
 173                 if (data->chip == max16067 || data->chip == max16068)
 174                         data->fault[0] |= data->fault[1];
 175
 176                 data->last_updated = jiffies;
 177                 data->valid = true;
 178         }
 179         mutex_unlock(&data->update_lock);
 180         return data;
 181 }
 182
 183 static ssize_t max16065_alarm_show(struct device *dev,
 184                                    struct device_attribute *da, char *buf)
 185 {
 186         struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da);
 187         struct max16065_data *data = max16065_update_device(dev);
 188         int val = data->fault[attr2->nr];
 189
 190         if (val < 0)
 191                 return val;
 192
 193         val &= (1 << attr2->index);
 194         if (val)
 195                 i2c_smbus_write_byte_data(data->client,
 196                                           MAX16065_FAULT(attr2->nr), val);
 197
 198         return sysfs_emit(buf, "%d\n", !!val);
 199 }
 200
 201 static ssize_t max16065_input_show(struct device *dev,
 202                                    struct device_attribute *da, char *buf)
 203 {
 204         struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 205         struct max16065_data *data = max16065_update_device(dev);
 206         int adc = data->adc[attr->index];
 207
 208         if (unlikely(adc < 0))
 209                 return adc;
 210
 211         return sysfs_emit(buf, "%d\n",
 212                           ADC_TO_MV(adc, data->range[attr->index]));
 213 }
 214
 215 static ssize_t max16065_current_show(struct device *dev,
 216                                      struct device_attribute *da, char *buf)
 217 {
 218         struct max16065_data *data = max16065_update_device(dev);
 219
 220         if (unlikely(data->curr_sense < 0))
 221                 return data->curr_sense;
 222
 223         return sysfs_emit(buf, "%d\n",
 224                           ADC_TO_CURR(data->curr_sense, data->curr_gain));
 225 }
 226
 227 static ssize_t max16065_limit_store(struct device *dev,
 228                                     struct device_attribute *da,
 229                                     const char *buf, size_t count)
 230 {
 231         struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da);
 232         struct max16065_data *data = dev_get_drvdata(dev);
 233         unsigned long val;
 234         int err;
 235         int limit;
 236
 237         err = kstrtoul(buf, 10, &val);
 238         if (unlikely(err < 0))
 239                 return err;
 240
 241         limit = MV_TO_LIMIT(val, data->range[attr2->index]);
 242
 243         mutex_lock(&data->update_lock);
 244         data->limit[attr2->nr][attr2->index]
 245           = LIMIT_TO_MV(limit, data->range[attr2->index]);
 246         i2c_smbus_write_byte_data(data->client,
 247                                   MAX16065_LIMIT(attr2->nr, attr2->index),
 248                                   limit);
 249         mutex_unlock(&data->update_lock);
 250
 251         return count;
 252 }
 253
 254 static ssize_t max16065_limit_show(struct device *dev,
 255                                    struct device_attribute *da, char *buf)
 256 {
 257         struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da);
 258         struct max16065_data *data = dev_get_drvdata(dev);
 259
 260         return sysfs_emit(buf, "%d\n",
 261                           data->limit[attr2->nr][attr2->index]);
 262 }
 263
 264 /* Construct a sensor_device_attribute structure for each register */
 265
 266 /* Input voltages */
 267 static SENSOR_DEVICE_ATTR_RO(in0_input, max16065_input, 0);
 268 static SENSOR_DEVICE_ATTR_RO(in1_input, max16065_input, 1);
 269 static SENSOR_DEVICE_ATTR_RO(in2_input, max16065_input, 2);
 270 static SENSOR_DEVICE_ATTR_RO(in3_input, max16065_input, 3);
 271 static SENSOR_DEVICE_ATTR_RO(in4_input, max16065_input, 4);
 272 static SENSOR_DEVICE_ATTR_RO(in5_input, max16065_input, 5);
 273 static SENSOR_DEVICE_ATTR_RO(in6_input, max16065_input, 6);
 274 static SENSOR_DEVICE_ATTR_RO(in7_input, max16065_input, 7);
 275 static SENSOR_DEVICE_ATTR_RO(in8_input, max16065_input, 8);
 276 static SENSOR_DEVICE_ATTR_RO(in9_input, max16065_input, 9);
 277 static SENSOR_DEVICE_ATTR_RO(in10_input, max16065_input, 10);
 278 static SENSOR_DEVICE_ATTR_RO(in11_input, max16065_input, 11);
 279 static SENSOR_DEVICE_ATTR_RO(in12_input, max16065_input, 12);
 280
 281 /* Input voltages lcrit */
 282 static SENSOR_DEVICE_ATTR_2_RW(in0_lcrit, max16065_limit, 2, 0);
 283 static SENSOR_DEVICE_ATTR_2_RW(in1_lcrit, max16065_limit, 2, 1);
 284 static SENSOR_DEVICE_ATTR_2_RW(in2_lcrit, max16065_limit, 2, 2);
 285 static SENSOR_DEVICE_ATTR_2_RW(in3_lcrit, max16065_limit, 2, 3);
 286 static SENSOR_DEVICE_ATTR_2_RW(in4_lcrit, max16065_limit, 2, 4);
 287 static SENSOR_DEVICE_ATTR_2_RW(in5_lcrit, max16065_limit, 2, 5);
 288 static SENSOR_DEVICE_ATTR_2_RW(in6_lcrit, max16065_limit, 2, 6);
 289 static SENSOR_DEVICE_ATTR_2_RW(in7_lcrit, max16065_limit, 2, 7);
 290 static SENSOR_DEVICE_ATTR_2_RW(in8_lcrit, max16065_limit, 2, 8);
 291 static SENSOR_DEVICE_ATTR_2_RW(in9_lcrit, max16065_limit, 2, 9);
 292 static SENSOR_DEVICE_ATTR_2_RW(in10_lcrit, max16065_limit, 2, 10);
 293 static SENSOR_DEVICE_ATTR_2_RW(in11_lcrit, max16065_limit, 2, 11);
 294
 295 /* Input voltages crit */
 296 static SENSOR_DEVICE_ATTR_2_RW(in0_crit, max16065_limit, 1, 0);
 297 static SENSOR_DEVICE_ATTR_2_RW(in1_crit, max16065_limit, 1, 1);
 298 static SENSOR_DEVICE_ATTR_2_RW(in2_crit, max16065_limit, 1, 2);
 299 static SENSOR_DEVICE_ATTR_2_RW(in3_crit, max16065_limit, 1, 3);
 300 static SENSOR_DEVICE_ATTR_2_RW(in4_crit, max16065_limit, 1, 4);
 301 static SENSOR_DEVICE_ATTR_2_RW(in5_crit, max16065_limit, 1, 5);
 302 static SENSOR_DEVICE_ATTR_2_RW(in6_crit, max16065_limit, 1, 6);
 303 static SENSOR_DEVICE_ATTR_2_RW(in7_crit, max16065_limit, 1, 7);
 304 static SENSOR_DEVICE_ATTR_2_RW(in8_crit, max16065_limit, 1, 8);
 305 static SENSOR_DEVICE_ATTR_2_RW(in9_crit, max16065_limit, 1, 9);
 306 static SENSOR_DEVICE_ATTR_2_RW(in10_crit, max16065_limit, 1, 10);
 307 static SENSOR_DEVICE_ATTR_2_RW(in11_crit, max16065_limit, 1, 11);
 308
 309 /* Input voltages min */
 310 static SENSOR_DEVICE_ATTR_2_RW(in0_min, max16065_limit, 0, 0);
 311 static SENSOR_DEVICE_ATTR_2_RW(in1_min, max16065_limit, 0, 1);
 312 static SENSOR_DEVICE_ATTR_2_RW(in2_min, max16065_limit, 0, 2);
 313 static SENSOR_DEVICE_ATTR_2_RW(in3_min, max16065_limit, 0, 3);
 314 static SENSOR_DEVICE_ATTR_2_RW(in4_min, max16065_limit, 0, 4);
 315 static SENSOR_DEVICE_ATTR_2_RW(in5_min, max16065_limit, 0, 5);
 316 static SENSOR_DEVICE_ATTR_2_RW(in6_min, max16065_limit, 0, 6);
 317 static SENSOR_DEVICE_ATTR_2_RW(in7_min, max16065_limit, 0, 7);
 318 static SENSOR_DEVICE_ATTR_2_RW(in8_min, max16065_limit, 0, 8);
 319 static SENSOR_DEVICE_ATTR_2_RW(in9_min, max16065_limit, 0, 9);
 320 static SENSOR_DEVICE_ATTR_2_RW(in10_min, max16065_limit, 0, 10);
 321 static SENSOR_DEVICE_ATTR_2_RW(in11_min, max16065_limit, 0, 11);
 322
 323 /* Input voltages max */
 324 static SENSOR_DEVICE_ATTR_2_RW(in0_max, max16065_limit, 0, 0);
 325 static SENSOR_DEVICE_ATTR_2_RW(in1_max, max16065_limit, 0, 1);
 326 static SENSOR_DEVICE_ATTR_2_RW(in2_max, max16065_limit, 0, 2);
 327 static SENSOR_DEVICE_ATTR_2_RW(in3_max, max16065_limit, 0, 3);
 328 static SENSOR_DEVICE_ATTR_2_RW(in4_max, max16065_limit, 0, 4);
 329 static SENSOR_DEVICE_ATTR_2_RW(in5_max, max16065_limit, 0, 5);
 330 static SENSOR_DEVICE_ATTR_2_RW(in6_max, max16065_limit, 0, 6);
 331 static SENSOR_DEVICE_ATTR_2_RW(in7_max, max16065_limit, 0, 7);
 332 static SENSOR_DEVICE_ATTR_2_RW(in8_max, max16065_limit, 0, 8);
 333 static SENSOR_DEVICE_ATTR_2_RW(in9_max, max16065_limit, 0, 9);
 334 static SENSOR_DEVICE_ATTR_2_RW(in10_max, max16065_limit, 0, 10);
 335 static SENSOR_DEVICE_ATTR_2_RW(in11_max, max16065_limit, 0, 11);
 336
 337 /* alarms */
 338 static SENSOR_DEVICE_ATTR_2_RO(in0_alarm, max16065_alarm, 0, 0);
 339 static SENSOR_DEVICE_ATTR_2_RO(in1_alarm, max16065_alarm, 0, 1);
 340 static SENSOR_DEVICE_ATTR_2_RO(in2_alarm, max16065_alarm, 0, 2);
 341 static SENSOR_DEVICE_ATTR_2_RO(in3_alarm, max16065_alarm, 0, 3);
 342 static SENSOR_DEVICE_ATTR_2_RO(in4_alarm, max16065_alarm, 0, 4);
 343 static SENSOR_DEVICE_ATTR_2_RO(in5_alarm, max16065_alarm, 0, 5);
 344 static SENSOR_DEVICE_ATTR_2_RO(in6_alarm, max16065_alarm, 0, 6);
 345 static SENSOR_DEVICE_ATTR_2_RO(in7_alarm, max16065_alarm, 0, 7);
 346 static SENSOR_DEVICE_ATTR_2_RO(in8_alarm, max16065_alarm, 1, 0);
 347 static SENSOR_DEVICE_ATTR_2_RO(in9_alarm, max16065_alarm, 1, 1);
 348 static SENSOR_DEVICE_ATTR_2_RO(in10_alarm, max16065_alarm, 1, 2);
 349 static SENSOR_DEVICE_ATTR_2_RO(in11_alarm, max16065_alarm, 1, 3);
 350
 351 /* Current and alarm */
 352 static SENSOR_DEVICE_ATTR_RO(curr1_input, max16065_current, 0);
 353 static SENSOR_DEVICE_ATTR_2_RO(curr1_alarm, max16065_alarm, 1, 4);
 354
 355 /*
 356  * Finally, construct an array of pointers to members of the above objects,
 357  * as required for sysfs_create_group()
 358  */
 359 static struct attribute *max16065_basic_attributes[] = {
 360         &sensor_dev_attr_in0_input.dev_attr.attr,
 361         &sensor_dev_attr_in0_lcrit.dev_attr.attr,
 362         &sensor_dev_attr_in0_crit.dev_attr.attr,
 363         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 364
 365         &sensor_dev_attr_in1_input.dev_attr.attr,
 366         &sensor_dev_attr_in1_lcrit.dev_attr.attr,
 367         &sensor_dev_attr_in1_crit.dev_attr.attr,
 368         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 369
 370         &sensor_dev_attr_in2_input.dev_attr.attr,
 371         &sensor_dev_attr_in2_lcrit.dev_attr.attr,
 372         &sensor_dev_attr_in2_crit.dev_attr.attr,
 373         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 374
 375         &sensor_dev_attr_in3_input.dev_attr.attr,
 376         &sensor_dev_attr_in3_lcrit.dev_attr.attr,
 377         &sensor_dev_attr_in3_crit.dev_attr.attr,
 378         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 379
 380         &sensor_dev_attr_in4_input.dev_attr.attr,
 381         &sensor_dev_attr_in4_lcrit.dev_attr.attr,
 382         &sensor_dev_attr_in4_crit.dev_attr.attr,
 383         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 384
 385         &sensor_dev_attr_in5_input.dev_attr.attr,
 386         &sensor_dev_attr_in5_lcrit.dev_attr.attr,
 387         &sensor_dev_attr_in5_crit.dev_attr.attr,
 388         &sensor_dev_attr_in5_alarm.dev_attr.attr,
 389
 390         &sensor_dev_attr_in6_input.dev_attr.attr,
 391         &sensor_dev_attr_in6_lcrit.dev_attr.attr,
 392         &sensor_dev_attr_in6_crit.dev_attr.attr,
 393         &sensor_dev_attr_in6_alarm.dev_attr.attr,
 394
 395         &sensor_dev_attr_in7_input.dev_attr.attr,
 396         &sensor_dev_attr_in7_lcrit.dev_attr.attr,
 397         &sensor_dev_attr_in7_crit.dev_attr.attr,
 398         &sensor_dev_attr_in7_alarm.dev_attr.attr,
 399
 400         &sensor_dev_attr_in8_input.dev_attr.attr,
 401         &sensor_dev_attr_in8_lcrit.dev_attr.attr,
 402         &sensor_dev_attr_in8_crit.dev_attr.attr,
 403         &sensor_dev_attr_in8_alarm.dev_attr.attr,
 404
 405         &sensor_dev_attr_in9_input.dev_attr.attr,
 406         &sensor_dev_attr_in9_lcrit.dev_attr.attr,
 407         &sensor_dev_attr_in9_crit.dev_attr.attr,
 408         &sensor_dev_attr_in9_alarm.dev_attr.attr,
 409
 410         &sensor_dev_attr_in10_input.dev_attr.attr,
 411         &sensor_dev_attr_in10_lcrit.dev_attr.attr,
 412         &sensor_dev_attr_in10_crit.dev_attr.attr,
 413         &sensor_dev_attr_in10_alarm.dev_attr.attr,
 414
 415         &sensor_dev_attr_in11_input.dev_attr.attr,
 416         &sensor_dev_attr_in11_lcrit.dev_attr.attr,
 417         &sensor_dev_attr_in11_crit.dev_attr.attr,
 418         &sensor_dev_attr_in11_alarm.dev_attr.attr,
 419
 420         NULL
 421 };
 422
 423 static struct attribute *max16065_current_attributes[] = {
 424         &sensor_dev_attr_in12_input.dev_attr.attr,
 425         &sensor_dev_attr_curr1_input.dev_attr.attr,
 426         &sensor_dev_attr_curr1_alarm.dev_attr.attr,
 427         NULL
 428 };
 429
 430 static struct attribute *max16065_min_attributes[] = {
 431         &sensor_dev_attr_in0_min.dev_attr.attr,
 432         &sensor_dev_attr_in1_min.dev_attr.attr,
 433         &sensor_dev_attr_in2_min.dev_attr.attr,
 434         &sensor_dev_attr_in3_min.dev_attr.attr,
 435         &sensor_dev_attr_in4_min.dev_attr.attr,
 436         &sensor_dev_attr_in5_min.dev_attr.attr,
 437         &sensor_dev_attr_in6_min.dev_attr.attr,
 438         &sensor_dev_attr_in7_min.dev_attr.attr,
 439         &sensor_dev_attr_in8_min.dev_attr.attr,
 440         &sensor_dev_attr_in9_min.dev_attr.attr,
 441         &sensor_dev_attr_in10_min.dev_attr.attr,
 442         &sensor_dev_attr_in11_min.dev_attr.attr,
 443         NULL
 444 };
 445
 446 static struct attribute *max16065_max_attributes[] = {
 447         &sensor_dev_attr_in0_max.dev_attr.attr,
 448         &sensor_dev_attr_in1_max.dev_attr.attr,
 449         &sensor_dev_attr_in2_max.dev_attr.attr,
 450         &sensor_dev_attr_in3_max.dev_attr.attr,
 451         &sensor_dev_attr_in4_max.dev_attr.attr,
 452         &sensor_dev_attr_in5_max.dev_attr.attr,
 453         &sensor_dev_attr_in6_max.dev_attr.attr,
 454         &sensor_dev_attr_in7_max.dev_attr.attr,
 455         &sensor_dev_attr_in8_max.dev_attr.attr,
 456         &sensor_dev_attr_in9_max.dev_attr.attr,
 457         &sensor_dev_attr_in10_max.dev_attr.attr,
 458         &sensor_dev_attr_in11_max.dev_attr.attr,
 459         NULL
 460 };
 461
 462 static umode_t max16065_basic_is_visible(struct kobject *kobj,
 463                                          struct attribute *a, int n)
 464 {
 465         struct device *dev = kobj_to_dev(kobj);
 466         struct max16065_data *data = dev_get_drvdata(dev);
 467         int index = n / 4;
 468
 469         if (index >= data->num_adc || !data->range[index])
 470                 return 0;
 471         return a->mode;
 472 }
 473
 474 static umode_t max16065_secondary_is_visible(struct kobject *kobj,
 475                                              struct attribute *a, int index)
 476 {
 477         struct device *dev = kobj_to_dev(kobj);
 478         struct max16065_data *data = dev_get_drvdata(dev);
 479
 480         if (index >= data->num_adc)
 481                 return 0;
 482         return a->mode;
 483 }
 484
 485 static const struct attribute_group max16065_basic_group = {
 486         .attrs = max16065_basic_attributes,
 487         .is_visible = max16065_basic_is_visible,
 488 };
 489
 490 static const struct attribute_group max16065_current_group = {
 491         .attrs = max16065_current_attributes,
 492 };
 493
 494 static const struct attribute_group max16065_min_group = {
 495         .attrs = max16065_min_attributes,
 496         .is_visible = max16065_secondary_is_visible,
 497 };
 498
 499 static const struct attribute_group max16065_max_group = {
 500         .attrs = max16065_max_attributes,
 501         .is_visible = max16065_secondary_is_visible,
 502 };
 503
 504 static int max16065_probe(struct i2c_client *client)
 505 {
 506         struct i2c_adapter *adapter = client->adapter;
 507         struct max16065_data *data;
 508         struct device *dev = &client->dev;
 509         struct device *hwmon_dev;
 510         int i, j, val;
 511         bool have_secondary;            /* true if chip has secondary limits */
 512         bool secondary_is_max = false;  /* secondary limits reflect max */
 513         int groups = 0;
 514         enum chips chip = (uintptr_t)i2c_get_match_data(client);
 515
 516         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
 517                                      | I2C_FUNC_SMBUS_READ_WORD_DATA))
 518                 return -ENODEV;
 519
 520         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 521         if (unlikely(!data))
 522                 return -ENOMEM;
 523
 524         data->chip = chip;
 525         data->client = client;
 526         mutex_init(&data->update_lock);
 527
 528         data->num_adc = max16065_num_adc[chip];
 529         data->have_current = max16065_have_current[chip];
 530         have_secondary = max16065_have_secondary[chip];
 531
 532         if (have_secondary) {
 533                 val = i2c_smbus_read_byte_data(client, MAX16065_SW_ENABLE);
 534                 if (unlikely(val < 0))
 535                         return val;
 536                 secondary_is_max = val & MAX16065_WARNING_OV;
 537         }
 538
 539         /* Read scale registers, convert to range */
 540         for (i = 0; i < DIV_ROUND_UP(data->num_adc, 4); i++) {
 541                 val = i2c_smbus_read_byte_data(client, MAX16065_SCALE(i));
 542                 if (unlikely(val < 0))
 543                         return val;
 544                 for (j = 0; j < 4 && i * 4 + j < data->num_adc; j++) {
 545                         data->range[i * 4 + j] =
 546                           max16065_adc_range[(val >> (j * 2)) & 0x3];
 547                 }
 548         }
 549
 550         /* Read limits */
 551         for (i = 0; i < MAX16065_NUM_LIMIT; i++) {
 552                 if (i == 0 && !have_secondary)
 553                         continue;
 554
 555                 for (j = 0; j < data->num_adc; j++) {
 556                         val = i2c_smbus_read_byte_data(client,
 557                                                        MAX16065_LIMIT(i, j));
 558                         if (unlikely(val < 0))
 559                                 return val;
 560                         data->limit[i][j] = LIMIT_TO_MV(val, data->range[j]);
 561                 }
 562         }
 563
 564         /* sysfs hooks */
 565         data->groups[groups++] = &max16065_basic_group;
 566         if (have_secondary)
 567                 data->groups[groups++] = secondary_is_max ?
 568                         &max16065_max_group : &max16065_min_group;
 569
 570         if (data->have_current) {
 571                 val = i2c_smbus_read_byte_data(client, MAX16065_CURR_CONTROL);
 572                 if (unlikely(val < 0))
 573                         return val;
 574                 if (val & MAX16065_CURR_ENABLE) {
 575                         /*
 576                          * Current gain is 6, 12, 24, 48 based on values in
 577                          * bit 2,3.
 578                          */
 579                         data->curr_gain = 6 << ((val >> 2) & 0x03);
 580                         data->range[MAX16065_NUM_ADC]
 581                           = max16065_csp_adc_range[(val >> 1) & 0x01];
 582                         data->groups[groups++] = &max16065_current_group;
 583                 } else {
 584                         data->have_current = false;
 585                 }
 586         }
 587
 588         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 589                                                            data, data->groups);
 590         return PTR_ERR_OR_ZERO(hwmon_dev);
 591 }
 592
 593 static const struct i2c_device_id max16065_id[] = {
 594         { "max16065", max16065 },
 595         { "max16066", max16066 },
 596         { "max16067", max16067 },
 597         { "max16068", max16068 },
 598         { "max16070", max16070 },
 599         { "max16071", max16071 },
 600         { }
 601 };
 602
 603 MODULE_DEVICE_TABLE(i2c, max16065_id);
 604
 605 /* This is the driver that will be inserted */
 606 static struct i2c_driver max16065_driver = {
 607         .driver = {
 608                 .name = "max16065",
 609         },
 610         .probe = max16065_probe,
 611         .id_table = max16065_id,
 612 };
 613
 614 module_i2c_driver(max16065_driver);
 615
 616 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
 617 MODULE_DESCRIPTION("MAX16065 driver");
 618 MODULE_LICENSE("GPL");