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/jiffies.h>
  26
  27enum 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
  57static 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
  66static 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
  75static 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
  84struct 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
 101static const int max16065_adc_range[] = { 5560, 2780, 1390, 0 };
 102static const int max16065_csp_adc_range[] = { 7000, 14000 };
 103
 104/* ADC registers have 10 bit resolution. */
 105static 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 */
 114static inline int LIMIT_TO_MV(int limit, int range)
 115{
 116        return limit * range / 256;
 117}
 118
 119static inline int MV_TO_LIMIT(int mv, int range)
 120{
 121        return clamp_val(DIV_ROUND_CLOSEST(mv * 256, range), 0, 255);
 122}
 123
 124static 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 */
 135static 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
 145static 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
 177static 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
 195static 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
 209static 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
 221static 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
 249static 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 */
 263static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, max16065_show_input, NULL, 0);
 264static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, max16065_show_input, NULL, 1);
 265static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, max16065_show_input, NULL, 2);
 266static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, max16065_show_input, NULL, 3);
 267static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, max16065_show_input, NULL, 4);
 268static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, max16065_show_input, NULL, 5);
 269static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, max16065_show_input, NULL, 6);
 270static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, max16065_show_input, NULL, 7);
 271static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, max16065_show_input, NULL, 8);
 272static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, max16065_show_input, NULL, 9);
 273static SENSOR_DEVICE_ATTR(in10_input, S_IRUGO, max16065_show_input, NULL, 10);
 274static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, max16065_show_input, NULL, 11);
 275static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, max16065_show_input, NULL, 12);
 276
 277/* Input voltages lcrit */
 278static SENSOR_DEVICE_ATTR_2(in0_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
 279                            max16065_set_limit, 2, 0);
 280static SENSOR_DEVICE_ATTR_2(in1_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
 281                            max16065_set_limit, 2, 1);
 282static SENSOR_DEVICE_ATTR_2(in2_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
 283                            max16065_set_limit, 2, 2);
 284static SENSOR_DEVICE_ATTR_2(in3_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
 285                            max16065_set_limit, 2, 3);
 286static SENSOR_DEVICE_ATTR_2(in4_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
 287                            max16065_set_limit, 2, 4);
 288static SENSOR_DEVICE_ATTR_2(in5_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
 289                            max16065_set_limit, 2, 5);
 290static SENSOR_DEVICE_ATTR_2(in6_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
 291                            max16065_set_limit, 2, 6);
 292static SENSOR_DEVICE_ATTR_2(in7_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
 293                            max16065_set_limit, 2, 7);
 294static SENSOR_DEVICE_ATTR_2(in8_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
 295                            max16065_set_limit, 2, 8);
 296static SENSOR_DEVICE_ATTR_2(in9_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
 297                            max16065_set_limit, 2, 9);
 298static SENSOR_DEVICE_ATTR_2(in10_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
 299                            max16065_set_limit, 2, 10);
 300static SENSOR_DEVICE_ATTR_2(in11_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
 301                            max16065_set_limit, 2, 11);
 302
 303/* Input voltages crit */
 304static SENSOR_DEVICE_ATTR_2(in0_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
 305                            max16065_set_limit, 1, 0);
 306static SENSOR_DEVICE_ATTR_2(in1_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
 307                            max16065_set_limit, 1, 1);
 308static SENSOR_DEVICE_ATTR_2(in2_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
 309                            max16065_set_limit, 1, 2);
 310static SENSOR_DEVICE_ATTR_2(in3_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
 311                            max16065_set_limit, 1, 3);
 312static SENSOR_DEVICE_ATTR_2(in4_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
 313                            max16065_set_limit, 1, 4);
 314static SENSOR_DEVICE_ATTR_2(in5_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
 315                            max16065_set_limit, 1, 5);
 316static SENSOR_DEVICE_ATTR_2(in6_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
 317                            max16065_set_limit, 1, 6);
 318static SENSOR_DEVICE_ATTR_2(in7_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
 319                            max16065_set_limit, 1, 7);
 320static SENSOR_DEVICE_ATTR_2(in8_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
 321                            max16065_set_limit, 1, 8);
 322static SENSOR_DEVICE_ATTR_2(in9_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
 323                            max16065_set_limit, 1, 9);
 324static SENSOR_DEVICE_ATTR_2(in10_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
 325                            max16065_set_limit, 1, 10);
 326static SENSOR_DEVICE_ATTR_2(in11_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
 327                            max16065_set_limit, 1, 11);
 328
 329/* Input voltages min */
 330static SENSOR_DEVICE_ATTR_2(in0_min, S_IWUSR | S_IRUGO, max16065_show_limit,
 331                            max16065_set_limit, 0, 0);
 332static SENSOR_DEVICE_ATTR_2(in1_min, S_IWUSR | S_IRUGO, max16065_show_limit,
 333                            max16065_set_limit, 0, 1);
 334static SENSOR_DEVICE_ATTR_2(in2_min, S_IWUSR | S_IRUGO, max16065_show_limit,
 335                            max16065_set_limit, 0, 2);
 336static SENSOR_DEVICE_ATTR_2(in3_min, S_IWUSR | S_IRUGO, max16065_show_limit,
 337                            max16065_set_limit, 0, 3);
 338static SENSOR_DEVICE_ATTR_2(in4_min, S_IWUSR | S_IRUGO, max16065_show_limit,
 339                            max16065_set_limit, 0, 4);
 340static SENSOR_DEVICE_ATTR_2(in5_min, S_IWUSR | S_IRUGO, max16065_show_limit,
 341                            max16065_set_limit, 0, 5);
 342static SENSOR_DEVICE_ATTR_2(in6_min, S_IWUSR | S_IRUGO, max16065_show_limit,
 343                            max16065_set_limit, 0, 6);
 344static SENSOR_DEVICE_ATTR_2(in7_min, S_IWUSR | S_IRUGO, max16065_show_limit,
 345                            max16065_set_limit, 0, 7);
 346static SENSOR_DEVICE_ATTR_2(in8_min, S_IWUSR | S_IRUGO, max16065_show_limit,
 347                            max16065_set_limit, 0, 8);
 348static SENSOR_DEVICE_ATTR_2(in9_min, S_IWUSR | S_IRUGO, max16065_show_limit,
 349                            max16065_set_limit, 0, 9);
 350static SENSOR_DEVICE_ATTR_2(in10_min, S_IWUSR | S_IRUGO, max16065_show_limit,
 351                            max16065_set_limit, 0, 10);
 352static SENSOR_DEVICE_ATTR_2(in11_min, S_IWUSR | S_IRUGO, max16065_show_limit,
 353                            max16065_set_limit, 0, 11);
 354
 355/* Input voltages max */
 356static SENSOR_DEVICE_ATTR_2(in0_max, S_IWUSR | S_IRUGO, max16065_show_limit,
 357                            max16065_set_limit, 0, 0);
 358static SENSOR_DEVICE_ATTR_2(in1_max, S_IWUSR | S_IRUGO, max16065_show_limit,
 359                            max16065_set_limit, 0, 1);
 360static SENSOR_DEVICE_ATTR_2(in2_max, S_IWUSR | S_IRUGO, max16065_show_limit,
 361                            max16065_set_limit, 0, 2);
 362static SENSOR_DEVICE_ATTR_2(in3_max, S_IWUSR | S_IRUGO, max16065_show_limit,
 363                            max16065_set_limit, 0, 3);
 364static SENSOR_DEVICE_ATTR_2(in4_max, S_IWUSR | S_IRUGO, max16065_show_limit,
 365                            max16065_set_limit, 0, 4);
 366static SENSOR_DEVICE_ATTR_2(in5_max, S_IWUSR | S_IRUGO, max16065_show_limit,
 367                            max16065_set_limit, 0, 5);
 368static SENSOR_DEVICE_ATTR_2(in6_max, S_IWUSR | S_IRUGO, max16065_show_limit,
 369                            max16065_set_limit, 0, 6);
 370static SENSOR_DEVICE_ATTR_2(in7_max, S_IWUSR | S_IRUGO, max16065_show_limit,
 371                            max16065_set_limit, 0, 7);
 372static SENSOR_DEVICE_ATTR_2(in8_max, S_IWUSR | S_IRUGO, max16065_show_limit,
 373                            max16065_set_limit, 0, 8);
 374static SENSOR_DEVICE_ATTR_2(in9_max, S_IWUSR | S_IRUGO, max16065_show_limit,
 375                            max16065_set_limit, 0, 9);
 376static SENSOR_DEVICE_ATTR_2(in10_max, S_IWUSR | S_IRUGO, max16065_show_limit,
 377                            max16065_set_limit, 0, 10);
 378static SENSOR_DEVICE_ATTR_2(in11_max, S_IWUSR | S_IRUGO, max16065_show_limit,
 379                            max16065_set_limit, 0, 11);
 380
 381/* alarms */
 382static SENSOR_DEVICE_ATTR_2(in0_alarm, S_IRUGO, max16065_show_alarm, NULL,
 383                            0, 0);
 384static SENSOR_DEVICE_ATTR_2(in1_alarm, S_IRUGO, max16065_show_alarm, NULL,
 385                            0, 1);
 386static SENSOR_DEVICE_ATTR_2(in2_alarm, S_IRUGO, max16065_show_alarm, NULL,
 387                            0, 2);
 388static SENSOR_DEVICE_ATTR_2(in3_alarm, S_IRUGO, max16065_show_alarm, NULL,
 389                            0, 3);
 390static SENSOR_DEVICE_ATTR_2(in4_alarm, S_IRUGO, max16065_show_alarm, NULL,
 391                            0, 4);
 392static SENSOR_DEVICE_ATTR_2(in5_alarm, S_IRUGO, max16065_show_alarm, NULL,
 393                            0, 5);
 394static SENSOR_DEVICE_ATTR_2(in6_alarm, S_IRUGO, max16065_show_alarm, NULL,
 395                            0, 6);
 396static SENSOR_DEVICE_ATTR_2(in7_alarm, S_IRUGO, max16065_show_alarm, NULL,
 397                            0, 7);
 398static SENSOR_DEVICE_ATTR_2(in8_alarm, S_IRUGO, max16065_show_alarm, NULL,
 399                            1, 0);
 400static SENSOR_DEVICE_ATTR_2(in9_alarm, S_IRUGO, max16065_show_alarm, NULL,
 401                            1, 1);
 402static SENSOR_DEVICE_ATTR_2(in10_alarm, S_IRUGO, max16065_show_alarm, NULL,
 403                            1, 2);
 404static SENSOR_DEVICE_ATTR_2(in11_alarm, S_IRUGO, max16065_show_alarm, NULL,
 405                            1, 3);
 406
 407/* Current and alarm */
 408static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, max16065_show_current, NULL, 0);
 409static 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 */
 416static 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
 480static 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
 487static 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
 503static 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
 519static const struct attribute_group max16065_basic_group = {
 520        .attrs = max16065_basic_attributes,
 521};
 522
 523static const struct attribute_group max16065_current_group = {
 524        .attrs = max16065_current_attributes,
 525};
 526
 527static const struct attribute_group max16065_min_group = {
 528        .attrs = max16065_min_attributes,
 529};
 530
 531static const struct attribute_group max16065_max_group = {
 532        .attrs = max16065_max_attributes,
 533};
 534
 535static 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
 543static 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
 655out:
 656        max16065_cleanup(client);
 657        return ret;
 658}
 659
 660static 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
 670static 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
 680MODULE_DEVICE_TABLE(i2c, max16065_id);
 681
 682/* This is the driver that will be inserted */
 683static 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
 692module_i2c_driver(max16065_driver);
 693
 694MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
 695MODULE_DESCRIPTION("MAX16065 driver");
 696MODULE_LICENSE("GPL");
 697
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