linux/drivers/hwmon/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/delay.h>
  26#include <linux/jiffies.h>
  27
  28enum chips { max16065, max16066, max16067, max16068, max16070, max16071 };
  29
  30/*
  31 * Registers
  32 */
  33#define MAX16065_ADC(x)         ((x) * 2)
  34
  35#define MAX16065_CURR_SENSE     0x18
  36#define MAX16065_CSP_ADC        0x19
  37#define MAX16065_FAULT(x)       (0x1b + (x))
  38#define MAX16065_SCALE(x)       (0x43 + (x))
  39#define MAX16065_CURR_CONTROL   0x47
  40#define MAX16065_LIMIT(l, x)    (0x48 + (l) + (x) * 3)  /*
  41                                                         * l: limit
  42                                                         *  0: min/max
  43                                                         *  1: crit
  44                                                         *  2: lcrit
  45                                                         * x: ADC index
  46                                                         */
  47
  48#define MAX16065_SW_ENABLE      0x73
  49
  50#define MAX16065_WARNING_OV     (1 << 3) /* Set if secondary threshold is OV
  51                                            warning */
  52
  53#define MAX16065_CURR_ENABLE    (1 << 0)
  54
  55#define MAX16065_NUM_LIMIT      3
  56#define MAX16065_NUM_ADC        12      /* maximum number of ADC channels */
  57
  58static const int max16065_num_adc[] = {
  59        [max16065] = 12,
  60        [max16066] = 8,
  61        [max16067] = 6,
  62        [max16068] = 6,
  63        [max16070] = 12,
  64        [max16071] = 8,
  65};
  66
  67static const bool max16065_have_secondary[] = {
  68        [max16065] = true,
  69        [max16066] = true,
  70        [max16067] = false,
  71        [max16068] = false,
  72        [max16070] = true,
  73        [max16071] = true,
  74};
  75
  76static const bool max16065_have_current[] = {
  77        [max16065] = true,
  78        [max16066] = true,
  79        [max16067] = false,
  80        [max16068] = false,
  81        [max16070] = true,
  82        [max16071] = true,
  83};
  84
  85struct max16065_data {
  86        enum chips type;
  87        struct device *hwmon_dev;
  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
 102static const int max16065_adc_range[] = { 5560, 2780, 1390, 0 };
 103static const int max16065_csp_adc_range[] = { 7000, 14000 };
 104
 105/* ADC registers have 10 bit resolution. */
 106static 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 */
 115static inline int LIMIT_TO_MV(int limit, int range)
 116{
 117        return limit * range / 256;
 118}
 119
 120static inline int MV_TO_LIMIT(int mv, int range)
 121{
 122        return SENSORS_LIMIT(DIV_ROUND_CLOSEST(mv * 256, range), 0, 255);
 123}
 124
 125static 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 */
 136static 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
 146static struct max16065_data *max16065_update_device(struct device *dev)
 147{
 148        struct i2c_client *client = to_i2c_client(dev);
 149        struct max16065_data *data = i2c_get_clientdata(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
 178static 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(to_i2c_client(dev),
 191                                          MAX16065_FAULT(attr2->nr), val);
 192
 193        return snprintf(buf, PAGE_SIZE, "%d\n", !!val);
 194}
 195
 196static 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
 210static 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
 222static 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 i2c_client *client = to_i2c_client(dev);
 228        struct max16065_data *data = i2c_get_clientdata(client);
 229        unsigned long val;
 230        int err;
 231        int limit;
 232
 233        err = kstrtoul(buf, 10, &val);
 234        if (unlikely(err < 0))
 235                return err;
 236
 237        limit = MV_TO_LIMIT(val, data->range[attr2->index]);
 238
 239        mutex_lock(&data->update_lock);
 240        data->limit[attr2->nr][attr2->index]
 241          = LIMIT_TO_MV(limit, data->range[attr2->index]);
 242        i2c_smbus_write_byte_data(client,
 243                                  MAX16065_LIMIT(attr2->nr, attr2->index),
 244                                  limit);
 245        mutex_unlock(&data->update_lock);
 246
 247        return count;
 248}
 249
 250static ssize_t max16065_show_limit(struct device *dev,
 251                                   struct device_attribute *da, char *buf)
 252{
 253        struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da);
 254        struct i2c_client *client = to_i2c_client(dev);
 255        struct max16065_data *data = i2c_get_clientdata(client);
 256
 257        return snprintf(buf, PAGE_SIZE, "%d\n",
 258                        data->limit[attr2->nr][attr2->index]);
 259}
 260
 261/* Construct a sensor_device_attribute structure for each register */
 262
 263/* Input voltages */
 264static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, max16065_show_input, NULL, 0);
 265static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, max16065_show_input, NULL, 1);
 266static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, max16065_show_input, NULL, 2);
 267static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, max16065_show_input, NULL, 3);
 268static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, max16065_show_input, NULL, 4);
 269static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, max16065_show_input, NULL, 5);
 270static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, max16065_show_input, NULL, 6);
 271static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, max16065_show_input, NULL, 7);
 272static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, max16065_show_input, NULL, 8);
 273static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, max16065_show_input, NULL, 9);
 274static SENSOR_DEVICE_ATTR(in10_input, S_IRUGO, max16065_show_input, NULL, 10);
 275static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, max16065_show_input, NULL, 11);
 276static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, max16065_show_input, NULL, 12);
 277
 278/* Input voltages lcrit */
 279static SENSOR_DEVICE_ATTR_2(in0_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
 280                            max16065_set_limit, 2, 0);
 281static SENSOR_DEVICE_ATTR_2(in1_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
 282                            max16065_set_limit, 2, 1);
 283static SENSOR_DEVICE_ATTR_2(in2_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
 284                            max16065_set_limit, 2, 2);
 285static SENSOR_DEVICE_ATTR_2(in3_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
 286                            max16065_set_limit, 2, 3);
 287static SENSOR_DEVICE_ATTR_2(in4_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
 288                            max16065_set_limit, 2, 4);
 289static SENSOR_DEVICE_ATTR_2(in5_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
 290                            max16065_set_limit, 2, 5);
 291static SENSOR_DEVICE_ATTR_2(in6_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
 292                            max16065_set_limit, 2, 6);
 293static SENSOR_DEVICE_ATTR_2(in7_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
 294                            max16065_set_limit, 2, 7);
 295static SENSOR_DEVICE_ATTR_2(in8_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
 296                            max16065_set_limit, 2, 8);
 297static SENSOR_DEVICE_ATTR_2(in9_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
 298                            max16065_set_limit, 2, 9);
 299static SENSOR_DEVICE_ATTR_2(in10_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
 300                            max16065_set_limit, 2, 10);
 301static SENSOR_DEVICE_ATTR_2(in11_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
 302                            max16065_set_limit, 2, 11);
 303
 304/* Input voltages crit */
 305static SENSOR_DEVICE_ATTR_2(in0_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
 306                            max16065_set_limit, 1, 0);
 307static SENSOR_DEVICE_ATTR_2(in1_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
 308                            max16065_set_limit, 1, 1);
 309static SENSOR_DEVICE_ATTR_2(in2_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
 310                            max16065_set_limit, 1, 2);
 311static SENSOR_DEVICE_ATTR_2(in3_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
 312                            max16065_set_limit, 1, 3);
 313static SENSOR_DEVICE_ATTR_2(in4_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
 314                            max16065_set_limit, 1, 4);
 315static SENSOR_DEVICE_ATTR_2(in5_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
 316                            max16065_set_limit, 1, 5);
 317static SENSOR_DEVICE_ATTR_2(in6_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
 318                            max16065_set_limit, 1, 6);
 319static SENSOR_DEVICE_ATTR_2(in7_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
 320                            max16065_set_limit, 1, 7);
 321static SENSOR_DEVICE_ATTR_2(in8_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
 322                            max16065_set_limit, 1, 8);
 323static SENSOR_DEVICE_ATTR_2(in9_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
 324                            max16065_set_limit, 1, 9);
 325static SENSOR_DEVICE_ATTR_2(in10_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
 326                            max16065_set_limit, 1, 10);
 327static SENSOR_DEVICE_ATTR_2(in11_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
 328                            max16065_set_limit, 1, 11);
 329
 330/* Input voltages min */
 331static SENSOR_DEVICE_ATTR_2(in0_min, S_IWUSR | S_IRUGO, max16065_show_limit,
 332                            max16065_set_limit, 0, 0);
 333static SENSOR_DEVICE_ATTR_2(in1_min, S_IWUSR | S_IRUGO, max16065_show_limit,
 334                            max16065_set_limit, 0, 1);
 335static SENSOR_DEVICE_ATTR_2(in2_min, S_IWUSR | S_IRUGO, max16065_show_limit,
 336                            max16065_set_limit, 0, 2);
 337static SENSOR_DEVICE_ATTR_2(in3_min, S_IWUSR | S_IRUGO, max16065_show_limit,
 338                            max16065_set_limit, 0, 3);
 339static SENSOR_DEVICE_ATTR_2(in4_min, S_IWUSR | S_IRUGO, max16065_show_limit,
 340                            max16065_set_limit, 0, 4);
 341static SENSOR_DEVICE_ATTR_2(in5_min, S_IWUSR | S_IRUGO, max16065_show_limit,
 342                            max16065_set_limit, 0, 5);
 343static SENSOR_DEVICE_ATTR_2(in6_min, S_IWUSR | S_IRUGO, max16065_show_limit,
 344                            max16065_set_limit, 0, 6);
 345static SENSOR_DEVICE_ATTR_2(in7_min, S_IWUSR | S_IRUGO, max16065_show_limit,
 346                            max16065_set_limit, 0, 7);
 347static SENSOR_DEVICE_ATTR_2(in8_min, S_IWUSR | S_IRUGO, max16065_show_limit,
 348                            max16065_set_limit, 0, 8);
 349static SENSOR_DEVICE_ATTR_2(in9_min, S_IWUSR | S_IRUGO, max16065_show_limit,
 350                            max16065_set_limit, 0, 9);
 351static SENSOR_DEVICE_ATTR_2(in10_min, S_IWUSR | S_IRUGO, max16065_show_limit,
 352                            max16065_set_limit, 0, 10);
 353static SENSOR_DEVICE_ATTR_2(in11_min, S_IWUSR | S_IRUGO, max16065_show_limit,
 354                            max16065_set_limit, 0, 11);
 355
 356/* Input voltages max */
 357static SENSOR_DEVICE_ATTR_2(in0_max, S_IWUSR | S_IRUGO, max16065_show_limit,
 358                            max16065_set_limit, 0, 0);
 359static SENSOR_DEVICE_ATTR_2(in1_max, S_IWUSR | S_IRUGO, max16065_show_limit,
 360                            max16065_set_limit, 0, 1);
 361static SENSOR_DEVICE_ATTR_2(in2_max, S_IWUSR | S_IRUGO, max16065_show_limit,
 362                            max16065_set_limit, 0, 2);
 363static SENSOR_DEVICE_ATTR_2(in3_max, S_IWUSR | S_IRUGO, max16065_show_limit,
 364                            max16065_set_limit, 0, 3);
 365static SENSOR_DEVICE_ATTR_2(in4_max, S_IWUSR | S_IRUGO, max16065_show_limit,
 366                            max16065_set_limit, 0, 4);
 367static SENSOR_DEVICE_ATTR_2(in5_max, S_IWUSR | S_IRUGO, max16065_show_limit,
 368                            max16065_set_limit, 0, 5);
 369static SENSOR_DEVICE_ATTR_2(in6_max, S_IWUSR | S_IRUGO, max16065_show_limit,
 370                            max16065_set_limit, 0, 6);
 371static SENSOR_DEVICE_ATTR_2(in7_max, S_IWUSR | S_IRUGO, max16065_show_limit,
 372                            max16065_set_limit, 0, 7);
 373static SENSOR_DEVICE_ATTR_2(in8_max, S_IWUSR | S_IRUGO, max16065_show_limit,
 374                            max16065_set_limit, 0, 8);
 375static SENSOR_DEVICE_ATTR_2(in9_max, S_IWUSR | S_IRUGO, max16065_show_limit,
 376                            max16065_set_limit, 0, 9);
 377static SENSOR_DEVICE_ATTR_2(in10_max, S_IWUSR | S_IRUGO, max16065_show_limit,
 378                            max16065_set_limit, 0, 10);
 379static SENSOR_DEVICE_ATTR_2(in11_max, S_IWUSR | S_IRUGO, max16065_show_limit,
 380                            max16065_set_limit, 0, 11);
 381
 382/* alarms */
 383static SENSOR_DEVICE_ATTR_2(in0_alarm, S_IRUGO, max16065_show_alarm, NULL,
 384                            0, 0);
 385static SENSOR_DEVICE_ATTR_2(in1_alarm, S_IRUGO, max16065_show_alarm, NULL,
 386                            0, 1);
 387static SENSOR_DEVICE_ATTR_2(in2_alarm, S_IRUGO, max16065_show_alarm, NULL,
 388                            0, 2);
 389static SENSOR_DEVICE_ATTR_2(in3_alarm, S_IRUGO, max16065_show_alarm, NULL,
 390                            0, 3);
 391static SENSOR_DEVICE_ATTR_2(in4_alarm, S_IRUGO, max16065_show_alarm, NULL,
 392                            0, 4);
 393static SENSOR_DEVICE_ATTR_2(in5_alarm, S_IRUGO, max16065_show_alarm, NULL,
 394                            0, 5);
 395static SENSOR_DEVICE_ATTR_2(in6_alarm, S_IRUGO, max16065_show_alarm, NULL,
 396                            0, 6);
 397static SENSOR_DEVICE_ATTR_2(in7_alarm, S_IRUGO, max16065_show_alarm, NULL,
 398                            0, 7);
 399static SENSOR_DEVICE_ATTR_2(in8_alarm, S_IRUGO, max16065_show_alarm, NULL,
 400                            1, 0);
 401static SENSOR_DEVICE_ATTR_2(in9_alarm, S_IRUGO, max16065_show_alarm, NULL,
 402                            1, 1);
 403static SENSOR_DEVICE_ATTR_2(in10_alarm, S_IRUGO, max16065_show_alarm, NULL,
 404                            1, 2);
 405static SENSOR_DEVICE_ATTR_2(in11_alarm, S_IRUGO, max16065_show_alarm, NULL,
 406                            1, 3);
 407
 408/* Current and alarm */
 409static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, max16065_show_current, NULL, 0);
 410static SENSOR_DEVICE_ATTR_2(curr1_alarm, S_IRUGO, max16065_show_alarm, NULL,
 411                            1, 4);
 412
 413/*
 414 * Finally, construct an array of pointers to members of the above objects,
 415 * as required for sysfs_create_group()
 416 */
 417static struct attribute *max16065_basic_attributes[] = {
 418        &sensor_dev_attr_in0_input.dev_attr.attr,
 419        &sensor_dev_attr_in0_lcrit.dev_attr.attr,
 420        &sensor_dev_attr_in0_crit.dev_attr.attr,
 421        &sensor_dev_attr_in0_alarm.dev_attr.attr,
 422
 423        &sensor_dev_attr_in1_input.dev_attr.attr,
 424        &sensor_dev_attr_in1_lcrit.dev_attr.attr,
 425        &sensor_dev_attr_in1_crit.dev_attr.attr,
 426        &sensor_dev_attr_in1_alarm.dev_attr.attr,
 427
 428        &sensor_dev_attr_in2_input.dev_attr.attr,
 429        &sensor_dev_attr_in2_lcrit.dev_attr.attr,
 430        &sensor_dev_attr_in2_crit.dev_attr.attr,
 431        &sensor_dev_attr_in2_alarm.dev_attr.attr,
 432
 433        &sensor_dev_attr_in3_input.dev_attr.attr,
 434        &sensor_dev_attr_in3_lcrit.dev_attr.attr,
 435        &sensor_dev_attr_in3_crit.dev_attr.attr,
 436        &sensor_dev_attr_in3_alarm.dev_attr.attr,
 437
 438        &sensor_dev_attr_in4_input.dev_attr.attr,
 439        &sensor_dev_attr_in4_lcrit.dev_attr.attr,
 440        &sensor_dev_attr_in4_crit.dev_attr.attr,
 441        &sensor_dev_attr_in4_alarm.dev_attr.attr,
 442
 443        &sensor_dev_attr_in5_input.dev_attr.attr,
 444        &sensor_dev_attr_in5_lcrit.dev_attr.attr,
 445        &sensor_dev_attr_in5_crit.dev_attr.attr,
 446        &sensor_dev_attr_in5_alarm.dev_attr.attr,
 447
 448        &sensor_dev_attr_in6_input.dev_attr.attr,
 449        &sensor_dev_attr_in6_lcrit.dev_attr.attr,
 450        &sensor_dev_attr_in6_crit.dev_attr.attr,
 451        &sensor_dev_attr_in6_alarm.dev_attr.attr,
 452
 453        &sensor_dev_attr_in7_input.dev_attr.attr,
 454        &sensor_dev_attr_in7_lcrit.dev_attr.attr,
 455        &sensor_dev_attr_in7_crit.dev_attr.attr,
 456        &sensor_dev_attr_in7_alarm.dev_attr.attr,
 457
 458        &sensor_dev_attr_in8_input.dev_attr.attr,
 459        &sensor_dev_attr_in8_lcrit.dev_attr.attr,
 460        &sensor_dev_attr_in8_crit.dev_attr.attr,
 461        &sensor_dev_attr_in8_alarm.dev_attr.attr,
 462
 463        &sensor_dev_attr_in9_input.dev_attr.attr,
 464        &sensor_dev_attr_in9_lcrit.dev_attr.attr,
 465        &sensor_dev_attr_in9_crit.dev_attr.attr,
 466        &sensor_dev_attr_in9_alarm.dev_attr.attr,
 467
 468        &sensor_dev_attr_in10_input.dev_attr.attr,
 469        &sensor_dev_attr_in10_lcrit.dev_attr.attr,
 470        &sensor_dev_attr_in10_crit.dev_attr.attr,
 471        &sensor_dev_attr_in10_alarm.dev_attr.attr,
 472
 473        &sensor_dev_attr_in11_input.dev_attr.attr,
 474        &sensor_dev_attr_in11_lcrit.dev_attr.attr,
 475        &sensor_dev_attr_in11_crit.dev_attr.attr,
 476        &sensor_dev_attr_in11_alarm.dev_attr.attr,
 477
 478        NULL
 479};
 480
 481static struct attribute *max16065_current_attributes[] = {
 482        &sensor_dev_attr_in12_input.dev_attr.attr,
 483        &sensor_dev_attr_curr1_input.dev_attr.attr,
 484        &sensor_dev_attr_curr1_alarm.dev_attr.attr,
 485        NULL
 486};
 487
 488static struct attribute *max16065_min_attributes[] = {
 489        &sensor_dev_attr_in0_min.dev_attr.attr,
 490        &sensor_dev_attr_in1_min.dev_attr.attr,
 491        &sensor_dev_attr_in2_min.dev_attr.attr,
 492        &sensor_dev_attr_in3_min.dev_attr.attr,
 493        &sensor_dev_attr_in4_min.dev_attr.attr,
 494        &sensor_dev_attr_in5_min.dev_attr.attr,
 495        &sensor_dev_attr_in6_min.dev_attr.attr,
 496        &sensor_dev_attr_in7_min.dev_attr.attr,
 497        &sensor_dev_attr_in8_min.dev_attr.attr,
 498        &sensor_dev_attr_in9_min.dev_attr.attr,
 499        &sensor_dev_attr_in10_min.dev_attr.attr,
 500        &sensor_dev_attr_in11_min.dev_attr.attr,
 501        NULL
 502};
 503
 504static struct attribute *max16065_max_attributes[] = {
 505        &sensor_dev_attr_in0_max.dev_attr.attr,
 506        &sensor_dev_attr_in1_max.dev_attr.attr,
 507        &sensor_dev_attr_in2_max.dev_attr.attr,
 508        &sensor_dev_attr_in3_max.dev_attr.attr,
 509        &sensor_dev_attr_in4_max.dev_attr.attr,
 510        &sensor_dev_attr_in5_max.dev_attr.attr,
 511        &sensor_dev_attr_in6_max.dev_attr.attr,
 512        &sensor_dev_attr_in7_max.dev_attr.attr,
 513        &sensor_dev_attr_in8_max.dev_attr.attr,
 514        &sensor_dev_attr_in9_max.dev_attr.attr,
 515        &sensor_dev_attr_in10_max.dev_attr.attr,
 516        &sensor_dev_attr_in11_max.dev_attr.attr,
 517        NULL
 518};
 519
 520static const struct attribute_group max16065_basic_group = {
 521        .attrs = max16065_basic_attributes,
 522};
 523
 524static const struct attribute_group max16065_current_group = {
 525        .attrs = max16065_current_attributes,
 526};
 527
 528static const struct attribute_group max16065_min_group = {
 529        .attrs = max16065_min_attributes,
 530};
 531
 532static const struct attribute_group max16065_max_group = {
 533        .attrs = max16065_max_attributes,
 534};
 535
 536static void max16065_cleanup(struct i2c_client *client)
 537{
 538        sysfs_remove_group(&client->dev.kobj, &max16065_max_group);
 539        sysfs_remove_group(&client->dev.kobj, &max16065_min_group);
 540        sysfs_remove_group(&client->dev.kobj, &max16065_current_group);
 541        sysfs_remove_group(&client->dev.kobj, &max16065_basic_group);
 542}
 543
 544static int max16065_probe(struct i2c_client *client,
 545                          const struct i2c_device_id *id)
 546{
 547        struct i2c_adapter *adapter = client->adapter;
 548        struct max16065_data *data;
 549        int i, j, val, ret;
 550        bool have_secondary;            /* true if chip has secondary limits */
 551        bool secondary_is_max = false;  /* secondary limits reflect max */
 552
 553        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
 554                                     | I2C_FUNC_SMBUS_READ_WORD_DATA))
 555                return -ENODEV;
 556
 557        data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
 558        if (unlikely(!data))
 559                return -ENOMEM;
 560
 561        i2c_set_clientdata(client, data);
 562        mutex_init(&data->update_lock);
 563
 564        data->num_adc = max16065_num_adc[id->driver_data];
 565        data->have_current = max16065_have_current[id->driver_data];
 566        have_secondary = max16065_have_secondary[id->driver_data];
 567
 568        if (have_secondary) {
 569                val = i2c_smbus_read_byte_data(client, MAX16065_SW_ENABLE);
 570                if (unlikely(val < 0))
 571                        return val;
 572                secondary_is_max = val & MAX16065_WARNING_OV;
 573        }
 574
 575        /* Read scale registers, convert to range */
 576        for (i = 0; i < DIV_ROUND_UP(data->num_adc, 4); i++) {
 577                val = i2c_smbus_read_byte_data(client, MAX16065_SCALE(i));
 578                if (unlikely(val < 0))
 579                        return val;
 580                for (j = 0; j < 4 && i * 4 + j < data->num_adc; j++) {
 581                        data->range[i * 4 + j] =
 582                          max16065_adc_range[(val >> (j * 2)) & 0x3];
 583                }
 584        }
 585
 586        /* Read limits */
 587        for (i = 0; i < MAX16065_NUM_LIMIT; i++) {
 588                if (i == 0 && !have_secondary)
 589                        continue;
 590
 591                for (j = 0; j < data->num_adc; j++) {
 592                        val = i2c_smbus_read_byte_data(client,
 593                                                       MAX16065_LIMIT(i, j));
 594                        if (unlikely(val < 0))
 595                                return val;
 596                        data->limit[i][j] = LIMIT_TO_MV(val, data->range[j]);
 597                }
 598        }
 599
 600        /* Register sysfs hooks */
 601        for (i = 0; i < data->num_adc * 4; i++) {
 602                /* Do not create sysfs entry if channel is disabled */
 603                if (!data->range[i / 4])
 604                        continue;
 605
 606                ret = sysfs_create_file(&client->dev.kobj,
 607                                        max16065_basic_attributes[i]);
 608                if (unlikely(ret))
 609                        goto out;
 610        }
 611
 612        if (have_secondary) {
 613                struct attribute **attr = secondary_is_max ?
 614                  max16065_max_attributes : max16065_min_attributes;
 615
 616                for (i = 0; i < data->num_adc; i++) {
 617                        if (!data->range[i])
 618                                continue;
 619
 620                        ret = sysfs_create_file(&client->dev.kobj, attr[i]);
 621                        if (unlikely(ret))
 622                                goto out;
 623                }
 624        }
 625
 626        if (data->have_current) {
 627                val = i2c_smbus_read_byte_data(client, MAX16065_CURR_CONTROL);
 628                if (unlikely(val < 0)) {
 629                        ret = val;
 630                        goto out;
 631                }
 632                if (val & MAX16065_CURR_ENABLE) {
 633                        /*
 634                         * Current gain is 6, 12, 24, 48 based on values in
 635                         * bit 2,3.
 636                         */
 637                        data->curr_gain = 6 << ((val >> 2) & 0x03);
 638                        data->range[MAX16065_NUM_ADC]
 639                          = max16065_csp_adc_range[(val >> 1) & 0x01];
 640                        ret = sysfs_create_group(&client->dev.kobj,
 641                                                 &max16065_current_group);
 642                        if (unlikely(ret))
 643                                goto out;
 644                } else {
 645                        data->have_current = false;
 646                }
 647        }
 648
 649        data->hwmon_dev = hwmon_device_register(&client->dev);
 650        if (unlikely(IS_ERR(data->hwmon_dev))) {
 651                ret = PTR_ERR(data->hwmon_dev);
 652                goto out;
 653        }
 654        return 0;
 655
 656out:
 657        max16065_cleanup(client);
 658        return ret;
 659}
 660
 661static int max16065_remove(struct i2c_client *client)
 662{
 663        struct max16065_data *data = i2c_get_clientdata(client);
 664
 665        hwmon_device_unregister(data->hwmon_dev);
 666        max16065_cleanup(client);
 667
 668        return 0;
 669}
 670
 671static const struct i2c_device_id max16065_id[] = {
 672        { "max16065", max16065 },
 673        { "max16066", max16066 },
 674        { "max16067", max16067 },
 675        { "max16068", max16068 },
 676        { "max16070", max16070 },
 677        { "max16071", max16071 },
 678        { }
 679};
 680
 681MODULE_DEVICE_TABLE(i2c, max16065_id);
 682
 683/* This is the driver that will be inserted */
 684static struct i2c_driver max16065_driver = {
 685        .driver = {
 686                .name = "max16065",
 687        },
 688        .probe = max16065_probe,
 689        .remove = max16065_remove,
 690        .id_table = max16065_id,
 691};
 692
 693module_i2c_driver(max16065_driver);
 694
 695MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
 696MODULE_DESCRIPTION("MAX16065 driver");
 697MODULE_LICENSE("GPL");
 698
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