drivers/hwmon/adc128d818.c

   1 /*
   2  * Driver for TI ADC128D818 System Monitor with Temperature Sensor
   3  *
   4  * Copyright (c) 2014 Guenter Roeck
   5  *
   6  * Derived from lm80.c
   7  * Copyright (C) 1998, 1999  Frodo Looijaard <frodol@dds.nl>
   8  *                           and Philip Edelbrock <phil@netroedge.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/slab.h>
  23 #include <linux/jiffies.h>
  24 #include <linux/i2c.h>
  25 #include <linux/hwmon.h>
  26 #include <linux/hwmon-sysfs.h>
  27 #include <linux/err.h>
  28 #include <linux/regulator/consumer.h>
  29 #include <linux/mutex.h>
  30 #include <linux/bitops.h>
  31 #include <linux/of.h>
  32
  33 /* Addresses to scan
  34  * The chip also supports addresses 0x35..0x37. Don't scan those addresses
  35  * since they are also used by some EEPROMs, which may result in false
  36  * positives.
  37  */
  38 static const unsigned short normal_i2c[] = {
  39         0x1d, 0x1e, 0x1f, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END };
  40
  41 /* registers */
  42 #define ADC128_REG_IN_MAX(nr)           (0x2a + (nr) * 2)
  43 #define ADC128_REG_IN_MIN(nr)           (0x2b + (nr) * 2)
  44 #define ADC128_REG_IN(nr)               (0x20 + (nr))
  45
  46 #define ADC128_REG_TEMP                 0x27
  47 #define ADC128_REG_TEMP_MAX             0x38
  48 #define ADC128_REG_TEMP_HYST            0x39
  49
  50 #define ADC128_REG_CONFIG               0x00
  51 #define ADC128_REG_ALARM                0x01
  52 #define ADC128_REG_MASK                 0x03
  53 #define ADC128_REG_CONV_RATE            0x07
  54 #define ADC128_REG_ONESHOT              0x09
  55 #define ADC128_REG_SHUTDOWN             0x0a
  56 #define ADC128_REG_CONFIG_ADV           0x0b
  57 #define ADC128_REG_BUSY_STATUS          0x0c
  58
  59 #define ADC128_REG_MAN_ID               0x3e
  60 #define ADC128_REG_DEV_ID               0x3f
  61
  62 /* No. of voltage entries in adc128_attrs */
  63 #define ADC128_ATTR_NUM_VOLT            (8 * 4)
  64
  65 /* Voltage inputs visible per operation mode */
  66 static const u8 num_inputs[] = { 7, 8, 4, 6 };
  67
  68 struct adc128_data {
  69         struct i2c_client *client;
  70         struct regulator *regulator;
  71         int vref;               /* Reference voltage in mV */
  72         struct mutex update_lock;
  73         u8 mode;                /* Operation mode */
  74         bool valid;             /* true if following fields are valid */
  75         unsigned long last_updated;     /* In jiffies */
  76
  77         u16 in[3][8];           /* Register value, normalized to 12 bit
  78                                  * 0: input voltage
  79                                  * 1: min limit
  80                                  * 2: max limit
  81                                  */
  82         s16 temp[3];            /* Register value, normalized to 9 bit
  83                                  * 0: sensor 1: limit 2: hyst
  84                                  */
  85         u8 alarms;              /* alarm register value */
  86 };
  87
  88 static struct adc128_data *adc128_update_device(struct device *dev)
  89 {
  90         struct adc128_data *data = dev_get_drvdata(dev);
  91         struct i2c_client *client = data->client;
  92         struct adc128_data *ret = data;
  93         int i, rv;
  94
  95         mutex_lock(&data->update_lock);
  96
  97         if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
  98                 for (i = 0; i < num_inputs[data->mode]; i++) {
  99                         rv = i2c_smbus_read_word_swapped(client,
 100                                                          ADC128_REG_IN(i));
 101                         if (rv < 0)
 102                                 goto abort;
 103                         data->in[0][i] = rv >> 4;
 104
 105                         rv = i2c_smbus_read_byte_data(client,
 106                                                       ADC128_REG_IN_MIN(i));
 107                         if (rv < 0)
 108                                 goto abort;
 109                         data->in[1][i] = rv << 4;
 110
 111                         rv = i2c_smbus_read_byte_data(client,
 112                                                       ADC128_REG_IN_MAX(i));
 113                         if (rv < 0)
 114                                 goto abort;
 115                         data->in[2][i] = rv << 4;
 116                 }
 117
 118                 if (data->mode != 1) {
 119                         rv = i2c_smbus_read_word_swapped(client,
 120                                                          ADC128_REG_TEMP);
 121                         if (rv < 0)
 122                                 goto abort;
 123                         data->temp[0] = rv >> 7;
 124
 125                         rv = i2c_smbus_read_byte_data(client,
 126                                                       ADC128_REG_TEMP_MAX);
 127                         if (rv < 0)
 128                                 goto abort;
 129                         data->temp[1] = rv << 1;
 130
 131                         rv = i2c_smbus_read_byte_data(client,
 132                                                       ADC128_REG_TEMP_HYST);
 133                         if (rv < 0)
 134                                 goto abort;
 135                         data->temp[2] = rv << 1;
 136                 }
 137
 138                 rv = i2c_smbus_read_byte_data(client, ADC128_REG_ALARM);
 139                 if (rv < 0)
 140                         goto abort;
 141                 data->alarms |= rv;
 142
 143                 data->last_updated = jiffies;
 144                 data->valid = true;
 145         }
 146         goto done;
 147
 148 abort:
 149         ret = ERR_PTR(rv);
 150         data->valid = false;
 151 done:
 152         mutex_unlock(&data->update_lock);
 153         return ret;
 154 }
 155
 156 static ssize_t adc128_show_in(struct device *dev, struct device_attribute *attr,
 157                               char *buf)
 158 {
 159         struct adc128_data *data = adc128_update_device(dev);
 160         int index = to_sensor_dev_attr_2(attr)->index;
 161         int nr = to_sensor_dev_attr_2(attr)->nr;
 162         int val;
 163
 164         if (IS_ERR(data))
 165                 return PTR_ERR(data);
 166
 167         val = DIV_ROUND_CLOSEST(data->in[index][nr] * data->vref, 4095);
 168         return sprintf(buf, "%d\n", val);
 169 }
 170
 171 static ssize_t adc128_set_in(struct device *dev, struct device_attribute *attr,
 172                              const char *buf, size_t count)
 173 {
 174         struct adc128_data *data = dev_get_drvdata(dev);
 175         int index = to_sensor_dev_attr_2(attr)->index;
 176         int nr = to_sensor_dev_attr_2(attr)->nr;
 177         u8 reg, regval;
 178         long val;
 179         int err;
 180
 181         err = kstrtol(buf, 10, &val);
 182         if (err < 0)
 183                 return err;
 184
 185         mutex_lock(&data->update_lock);
 186         /* 10 mV LSB on limit registers */
 187         regval = clamp_val(DIV_ROUND_CLOSEST(val, 10), 0, 255);
 188         data->in[index][nr] = regval << 4;
 189         reg = index == 1 ? ADC128_REG_IN_MIN(nr) : ADC128_REG_IN_MAX(nr);
 190         i2c_smbus_write_byte_data(data->client, reg, regval);
 191         mutex_unlock(&data->update_lock);
 192
 193         return count;
 194 }
 195
 196 static ssize_t adc128_show_temp(struct device *dev,
 197                                 struct device_attribute *attr, char *buf)
 198 {
 199         struct adc128_data *data = adc128_update_device(dev);
 200         int index = to_sensor_dev_attr(attr)->index;
 201         int temp;
 202
 203         if (IS_ERR(data))
 204                 return PTR_ERR(data);
 205
 206         temp = sign_extend32(data->temp[index], 8);
 207         return sprintf(buf, "%d\n", temp * 500);/* 0.5 degrees C resolution */
 208 }
 209
 210 static ssize_t adc128_set_temp(struct device *dev,
 211                                struct device_attribute *attr,
 212                                const char *buf, size_t count)
 213 {
 214         struct adc128_data *data = dev_get_drvdata(dev);
 215         int index = to_sensor_dev_attr(attr)->index;
 216         long val;
 217         int err;
 218         s8 regval;
 219
 220         err = kstrtol(buf, 10, &val);
 221         if (err < 0)
 222                 return err;
 223
 224         mutex_lock(&data->update_lock);
 225         regval = clamp_val(DIV_ROUND_CLOSEST(val, 1000), -128, 127);
 226         data->temp[index] = regval << 1;
 227         i2c_smbus_write_byte_data(data->client,
 228                                   index == 1 ? ADC128_REG_TEMP_MAX
 229                                              : ADC128_REG_TEMP_HYST,
 230                                   regval);
 231         mutex_unlock(&data->update_lock);
 232
 233         return count;
 234 }
 235
 236 static ssize_t adc128_show_alarm(struct device *dev,
 237                                  struct device_attribute *attr, char *buf)
 238 {
 239         struct adc128_data *data = adc128_update_device(dev);
 240         int mask = 1 << to_sensor_dev_attr(attr)->index;
 241         u8 alarms;
 242
 243         if (IS_ERR(data))
 244                 return PTR_ERR(data);
 245
 246         /*
 247          * Clear an alarm after reporting it to user space. If it is still
 248          * active, the next update sequence will set the alarm bit again.
 249          */
 250         alarms = data->alarms;
 251         data->alarms &= ~mask;
 252
 253         return sprintf(buf, "%u\n", !!(alarms & mask));
 254 }
 255
 256 static umode_t adc128_is_visible(struct kobject *kobj,
 257                                  struct attribute *attr, int index)
 258 {
 259         struct device *dev = container_of(kobj, struct device, kobj);
 260         struct adc128_data *data = dev_get_drvdata(dev);
 261
 262         if (index < ADC128_ATTR_NUM_VOLT) {
 263                 /* Voltage, visible according to num_inputs[] */
 264                 if (index >= num_inputs[data->mode] * 4)
 265                         return 0;
 266         } else {
 267                 /* Temperature, visible if not in mode 1 */
 268                 if (data->mode == 1)
 269                         return 0;
 270         }
 271
 272         return attr->mode;
 273 }
 274
 275 static SENSOR_DEVICE_ATTR_2(in0_input, S_IRUGO,
 276                             adc128_show_in, NULL, 0, 0);
 277 static SENSOR_DEVICE_ATTR_2(in0_min, S_IWUSR | S_IRUGO,
 278                             adc128_show_in, adc128_set_in, 0, 1);
 279 static SENSOR_DEVICE_ATTR_2(in0_max, S_IWUSR | S_IRUGO,
 280                             adc128_show_in, adc128_set_in, 0, 2);
 281
 282 static SENSOR_DEVICE_ATTR_2(in1_input, S_IRUGO,
 283                             adc128_show_in, NULL, 1, 0);
 284 static SENSOR_DEVICE_ATTR_2(in1_min, S_IWUSR | S_IRUGO,
 285                             adc128_show_in, adc128_set_in, 1, 1);
 286 static SENSOR_DEVICE_ATTR_2(in1_max, S_IWUSR | S_IRUGO,
 287                             adc128_show_in, adc128_set_in, 1, 2);
 288
 289 static SENSOR_DEVICE_ATTR_2(in2_input, S_IRUGO,
 290                             adc128_show_in, NULL, 2, 0);
 291 static SENSOR_DEVICE_ATTR_2(in2_min, S_IWUSR | S_IRUGO,
 292                             adc128_show_in, adc128_set_in, 2, 1);
 293 static SENSOR_DEVICE_ATTR_2(in2_max, S_IWUSR | S_IRUGO,
 294                             adc128_show_in, adc128_set_in, 2, 2);
 295
 296 static SENSOR_DEVICE_ATTR_2(in3_input, S_IRUGO,
 297                             adc128_show_in, NULL, 3, 0);
 298 static SENSOR_DEVICE_ATTR_2(in3_min, S_IWUSR | S_IRUGO,
 299                             adc128_show_in, adc128_set_in, 3, 1);
 300 static SENSOR_DEVICE_ATTR_2(in3_max, S_IWUSR | S_IRUGO,
 301                             adc128_show_in, adc128_set_in, 3, 2);
 302
 303 static SENSOR_DEVICE_ATTR_2(in4_input, S_IRUGO,
 304                             adc128_show_in, NULL, 4, 0);
 305 static SENSOR_DEVICE_ATTR_2(in4_min, S_IWUSR | S_IRUGO,
 306                             adc128_show_in, adc128_set_in, 4, 1);
 307 static SENSOR_DEVICE_ATTR_2(in4_max, S_IWUSR | S_IRUGO,
 308                             adc128_show_in, adc128_set_in, 4, 2);
 309
 310 static SENSOR_DEVICE_ATTR_2(in5_input, S_IRUGO,
 311                             adc128_show_in, NULL, 5, 0);
 312 static SENSOR_DEVICE_ATTR_2(in5_min, S_IWUSR | S_IRUGO,
 313                             adc128_show_in, adc128_set_in, 5, 1);
 314 static SENSOR_DEVICE_ATTR_2(in5_max, S_IWUSR | S_IRUGO,
 315                             adc128_show_in, adc128_set_in, 5, 2);
 316
 317 static SENSOR_DEVICE_ATTR_2(in6_input, S_IRUGO,
 318                             adc128_show_in, NULL, 6, 0);
 319 static SENSOR_DEVICE_ATTR_2(in6_min, S_IWUSR | S_IRUGO,
 320                             adc128_show_in, adc128_set_in, 6, 1);
 321 static SENSOR_DEVICE_ATTR_2(in6_max, S_IWUSR | S_IRUGO,
 322                             adc128_show_in, adc128_set_in, 6, 2);
 323
 324 static SENSOR_DEVICE_ATTR_2(in7_input, S_IRUGO,
 325                             adc128_show_in, NULL, 7, 0);
 326 static SENSOR_DEVICE_ATTR_2(in7_min, S_IWUSR | S_IRUGO,
 327                             adc128_show_in, adc128_set_in, 7, 1);
 328 static SENSOR_DEVICE_ATTR_2(in7_max, S_IWUSR | S_IRUGO,
 329                             adc128_show_in, adc128_set_in, 7, 2);
 330
 331 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, adc128_show_temp, NULL, 0);
 332 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
 333                           adc128_show_temp, adc128_set_temp, 1);
 334 static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
 335                           adc128_show_temp, adc128_set_temp, 2);
 336
 337 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, adc128_show_alarm, NULL, 0);
 338 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, adc128_show_alarm, NULL, 1);
 339 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, adc128_show_alarm, NULL, 2);
 340 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, adc128_show_alarm, NULL, 3);
 341 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, adc128_show_alarm, NULL, 4);
 342 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, adc128_show_alarm, NULL, 5);
 343 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, adc128_show_alarm, NULL, 6);
 344 static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, adc128_show_alarm, NULL, 7);
 345 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, adc128_show_alarm, NULL, 7);
 346
 347 static struct attribute *adc128_attrs[] = {
 348         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 349         &sensor_dev_attr_in0_input.dev_attr.attr,
 350         &sensor_dev_attr_in0_max.dev_attr.attr,
 351         &sensor_dev_attr_in0_min.dev_attr.attr,
 352         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 353         &sensor_dev_attr_in1_input.dev_attr.attr,
 354         &sensor_dev_attr_in1_max.dev_attr.attr,
 355         &sensor_dev_attr_in1_min.dev_attr.attr,
 356         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 357         &sensor_dev_attr_in2_input.dev_attr.attr,
 358         &sensor_dev_attr_in2_max.dev_attr.attr,
 359         &sensor_dev_attr_in2_min.dev_attr.attr,
 360         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 361         &sensor_dev_attr_in3_input.dev_attr.attr,
 362         &sensor_dev_attr_in3_max.dev_attr.attr,
 363         &sensor_dev_attr_in3_min.dev_attr.attr,
 364         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 365         &sensor_dev_attr_in4_input.dev_attr.attr,
 366         &sensor_dev_attr_in4_max.dev_attr.attr,
 367         &sensor_dev_attr_in4_min.dev_attr.attr,
 368         &sensor_dev_attr_in5_alarm.dev_attr.attr,
 369         &sensor_dev_attr_in5_input.dev_attr.attr,
 370         &sensor_dev_attr_in5_max.dev_attr.attr,
 371         &sensor_dev_attr_in5_min.dev_attr.attr,
 372         &sensor_dev_attr_in6_alarm.dev_attr.attr,
 373         &sensor_dev_attr_in6_input.dev_attr.attr,
 374         &sensor_dev_attr_in6_max.dev_attr.attr,
 375         &sensor_dev_attr_in6_min.dev_attr.attr,
 376         &sensor_dev_attr_in7_alarm.dev_attr.attr,
 377         &sensor_dev_attr_in7_input.dev_attr.attr,
 378         &sensor_dev_attr_in7_max.dev_attr.attr,
 379         &sensor_dev_attr_in7_min.dev_attr.attr,
 380         &sensor_dev_attr_temp1_input.dev_attr.attr,
 381         &sensor_dev_attr_temp1_max.dev_attr.attr,
 382         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 383         &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
 384         NULL
 385 };
 386
 387 static struct attribute_group adc128_group = {
 388         .attrs = adc128_attrs,
 389         .is_visible = adc128_is_visible,
 390 };
 391 __ATTRIBUTE_GROUPS(adc128);
 392
 393 static int adc128_detect(struct i2c_client *client, struct i2c_board_info *info)
 394 {
 395         int man_id, dev_id;
 396
 397         if (!i2c_check_functionality(client->adapter,
 398                                      I2C_FUNC_SMBUS_BYTE_DATA |
 399                                      I2C_FUNC_SMBUS_WORD_DATA))
 400                 return -ENODEV;
 401
 402         man_id = i2c_smbus_read_byte_data(client, ADC128_REG_MAN_ID);
 403         dev_id = i2c_smbus_read_byte_data(client, ADC128_REG_DEV_ID);
 404         if (man_id != 0x01 || dev_id != 0x09)
 405                 return -ENODEV;
 406
 407         /* Check unused bits for confirmation */
 408         if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG) & 0xf4)
 409                 return -ENODEV;
 410         if (i2c_smbus_read_byte_data(client, ADC128_REG_CONV_RATE) & 0xfe)
 411                 return -ENODEV;
 412         if (i2c_smbus_read_byte_data(client, ADC128_REG_ONESHOT) & 0xfe)
 413                 return -ENODEV;
 414         if (i2c_smbus_read_byte_data(client, ADC128_REG_SHUTDOWN) & 0xfe)
 415                 return -ENODEV;
 416         if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV) & 0xf8)
 417                 return -ENODEV;
 418         if (i2c_smbus_read_byte_data(client, ADC128_REG_BUSY_STATUS) & 0xfc)
 419                 return -ENODEV;
 420
 421         strlcpy(info->type, "adc128d818", I2C_NAME_SIZE);
 422
 423         return 0;
 424 }
 425
 426 static int adc128_init_client(struct adc128_data *data)
 427 {
 428         struct i2c_client *client = data->client;
 429         int err;
 430
 431         /*
 432          * Reset chip to defaults.
 433          * This makes most other initializations unnecessary.
 434          */
 435         err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x80);
 436         if (err)
 437                 return err;
 438
 439         /* Set operation mode, if non-default */
 440         if (data->mode != 0) {
 441                 err = i2c_smbus_write_byte_data(client,
 442                                                 ADC128_REG_CONFIG_ADV,
 443                                                 data->mode << 1);
 444                 if (err)
 445                         return err;
 446         }
 447
 448         /* Start monitoring */
 449         err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x01);
 450         if (err)
 451                 return err;
 452
 453         /* If external vref is selected, configure the chip to use it */
 454         if (data->regulator) {
 455                 err = i2c_smbus_write_byte_data(client,
 456                                                 ADC128_REG_CONFIG_ADV, 0x01);
 457                 if (err)
 458                         return err;
 459         }
 460
 461         return 0;
 462 }
 463
 464 static int adc128_probe(struct i2c_client *client,
 465                         const struct i2c_device_id *id)
 466 {
 467         struct device *dev = &client->dev;
 468         struct regulator *regulator;
 469         struct device *hwmon_dev;
 470         struct adc128_data *data;
 471         int err, vref;
 472
 473         data = devm_kzalloc(dev, sizeof(struct adc128_data), GFP_KERNEL);
 474         if (!data)
 475                 return -ENOMEM;
 476
 477         /* vref is optional. If specified, is used as chip reference voltage */
 478         regulator = devm_regulator_get_optional(dev, "vref");
 479         if (!IS_ERR(regulator)) {
 480                 data->regulator = regulator;
 481                 err = regulator_enable(regulator);
 482                 if (err < 0)
 483                         return err;
 484                 vref = regulator_get_voltage(regulator);
 485                 if (vref < 0) {
 486                         err = vref;
 487                         goto error;
 488                 }
 489                 data->vref = DIV_ROUND_CLOSEST(vref, 1000);
 490         } else {
 491                 data->vref = 2560;      /* 2.56V, in mV */
 492         }
 493
 494         /* Operation mode is optional. If unspecified, keep current mode */
 495         if (of_property_read_u8(dev->of_node, "ti,mode", &data->mode) == 0) {
 496                 if (data->mode > 3) {
 497                         dev_err(dev, "invalid operation mode %d\n",
 498                                 data->mode);
 499                         err = -EINVAL;
 500                         goto error;
 501                 }
 502         } else {
 503                 err = i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV);
 504                 if (err < 0)
 505                         goto error;
 506                 data->mode = (err >> 1) & ADC128_REG_MASK;
 507         }
 508
 509         data->client = client;
 510         i2c_set_clientdata(client, data);
 511         mutex_init(&data->update_lock);
 512
 513         /* Initialize the chip */
 514         err = adc128_init_client(data);
 515         if (err < 0)
 516                 goto error;
 517
 518         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 519                                                            data, adc128_groups);
 520         if (IS_ERR(hwmon_dev)) {
 521                 err = PTR_ERR(hwmon_dev);
 522                 goto error;
 523         }
 524
 525         return 0;
 526
 527 error:
 528         if (data->regulator)
 529                 regulator_disable(data->regulator);
 530         return err;
 531 }
 532
 533 static int adc128_remove(struct i2c_client *client)
 534 {
 535         struct adc128_data *data = i2c_get_clientdata(client);
 536
 537         if (data->regulator)
 538                 regulator_disable(data->regulator);
 539
 540         return 0;
 541 }
 542
 543 static const struct i2c_device_id adc128_id[] = {
 544         { "adc128d818", 0 },
 545         { }
 546 };
 547 MODULE_DEVICE_TABLE(i2c, adc128_id);
 548
 549 static const struct of_device_id adc128_of_match[] = {
 550         { .compatible = "ti,adc128d818" },
 551         { },
 552 };
 553 MODULE_DEVICE_TABLE(of, adc128_of_match);
 554
 555 static struct i2c_driver adc128_driver = {
 556         .class          = I2C_CLASS_HWMON,
 557         .driver = {
 558                 .name   = "adc128d818",
 559                 .of_match_table = of_match_ptr(adc128_of_match),
 560         },
 561         .probe          = adc128_probe,
 562         .remove         = adc128_remove,
 563         .id_table       = adc128_id,
 564         .detect         = adc128_detect,
 565         .address_list   = normal_i2c,
 566 };
 567
 568 module_i2c_driver(adc128_driver);
 569
 570 MODULE_AUTHOR("Guenter Roeck");
 571 MODULE_DESCRIPTION("Driver for ADC128D818");
 572 MODULE_LICENSE("GPL");