drivers/hwmon/ina2xx.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Driver for Texas Instruments INA219, INA226 power monitor chips
   4  *
   5  * INA219:
   6  * Zero Drift Bi-Directional Current/Power Monitor with I2C Interface
   7  * Datasheet: https://www.ti.com/product/ina219
   8  *
   9  * INA220:
  10  * Bi-Directional Current/Power Monitor with I2C Interface
  11  * Datasheet: https://www.ti.com/product/ina220
  12  *
  13  * INA226:
  14  * Bi-Directional Current/Power Monitor with I2C Interface
  15  * Datasheet: https://www.ti.com/product/ina226
  16  *
  17  * INA230:
  18  * Bi-directional Current/Power Monitor with I2C Interface
  19  * Datasheet: https://www.ti.com/product/ina230
  20  *
  21  * Copyright (C) 2012 Lothar Felten <lothar.felten@gmail.com>
  22  * Thanks to Jan Volkering
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/init.h>
  28 #include <linux/err.h>
  29 #include <linux/slab.h>
  30 #include <linux/i2c.h>
  31 #include <linux/hwmon.h>
  32 #include <linux/hwmon-sysfs.h>
  33 #include <linux/jiffies.h>
  34 #include <linux/of_device.h>
  35 #include <linux/of.h>
  36 #include <linux/delay.h>
  37 #include <linux/util_macros.h>
  38 #include <linux/regmap.h>
  39
  40 #include <linux/platform_data/ina2xx.h>
  41
  42 /* common register definitions */
  43 #define INA2XX_CONFIG                   0x00
  44 #define INA2XX_SHUNT_VOLTAGE            0x01 /* readonly */
  45 #define INA2XX_BUS_VOLTAGE              0x02 /* readonly */
  46 #define INA2XX_POWER                    0x03 /* readonly */
  47 #define INA2XX_CURRENT                  0x04 /* readonly */
  48 #define INA2XX_CALIBRATION              0x05
  49
  50 /* INA226 register definitions */
  51 #define INA226_MASK_ENABLE              0x06
  52 #define INA226_ALERT_LIMIT              0x07
  53 #define INA226_DIE_ID                   0xFF
  54
  55 /* register count */
  56 #define INA219_REGISTERS                6
  57 #define INA226_REGISTERS                8
  58
  59 #define INA2XX_MAX_REGISTERS            8
  60
  61 /* settings - depend on use case */
  62 #define INA219_CONFIG_DEFAULT           0x399F  /* PGA=8 */
  63 #define INA226_CONFIG_DEFAULT           0x4527  /* averages=16 */
  64
  65 /* worst case is 68.10 ms (~14.6Hz, ina219) */
  66 #define INA2XX_CONVERSION_RATE          15
  67 #define INA2XX_MAX_DELAY                69 /* worst case delay in ms */
  68
  69 #define INA2XX_RSHUNT_DEFAULT           10000
  70
  71 /* bit mask for reading the averaging setting in the configuration register */
  72 #define INA226_AVG_RD_MASK              0x0E00
  73
  74 #define INA226_READ_AVG(reg)            (((reg) & INA226_AVG_RD_MASK) >> 9)
  75 #define INA226_SHIFT_AVG(val)           ((val) << 9)
  76
  77 /* bit number of alert functions in Mask/Enable Register */
  78 #define INA226_SHUNT_OVER_VOLTAGE_BIT   15
  79 #define INA226_SHUNT_UNDER_VOLTAGE_BIT  14
  80 #define INA226_BUS_OVER_VOLTAGE_BIT     13
  81 #define INA226_BUS_UNDER_VOLTAGE_BIT    12
  82 #define INA226_POWER_OVER_LIMIT_BIT     11
  83
  84 /* bit mask for alert config bits of Mask/Enable Register */
  85 #define INA226_ALERT_CONFIG_MASK        0xFC00
  86 #define INA226_ALERT_FUNCTION_FLAG      BIT(4)
  87
  88 /* common attrs, ina226 attrs and NULL */
  89 #define INA2XX_MAX_ATTRIBUTE_GROUPS     3
  90
  91 /*
  92  * Both bus voltage and shunt voltage conversion times for ina226 are set
  93  * to 0b0100 on POR, which translates to 2200 microseconds in total.
  94  */
  95 #define INA226_TOTAL_CONV_TIME_DEFAULT  2200
  96
  97 static struct regmap_config ina2xx_regmap_config = {
  98         .reg_bits = 8,
  99         .val_bits = 16,
 100 };
 101
 102 enum ina2xx_ids { ina219, ina226 };
 103
 104 struct ina2xx_config {
 105         u16 config_default;
 106         int calibration_value;
 107         int registers;
 108         int shunt_div;
 109         int bus_voltage_shift;
 110         int bus_voltage_lsb;    /* uV */
 111         int power_lsb_factor;
 112 };
 113
 114 struct ina2xx_data {
 115         const struct ina2xx_config *config;
 116
 117         long rshunt;
 118         long current_lsb_uA;
 119         long power_lsb_uW;
 120         struct mutex config_lock;
 121         struct regmap *regmap;
 122
 123         const struct attribute_group *groups[INA2XX_MAX_ATTRIBUTE_GROUPS];
 124 };
 125
 126 static const struct ina2xx_config ina2xx_config[] = {
 127         [ina219] = {
 128                 .config_default = INA219_CONFIG_DEFAULT,
 129                 .calibration_value = 4096,
 130                 .registers = INA219_REGISTERS,
 131                 .shunt_div = 100,
 132                 .bus_voltage_shift = 3,
 133                 .bus_voltage_lsb = 4000,
 134                 .power_lsb_factor = 20,
 135         },
 136         [ina226] = {
 137                 .config_default = INA226_CONFIG_DEFAULT,
 138                 .calibration_value = 2048,
 139                 .registers = INA226_REGISTERS,
 140                 .shunt_div = 400,
 141                 .bus_voltage_shift = 0,
 142                 .bus_voltage_lsb = 1250,
 143                 .power_lsb_factor = 25,
 144         },
 145 };
 146
 147 /*
 148  * Available averaging rates for ina226. The indices correspond with
 149  * the bit values expected by the chip (according to the ina226 datasheet,
 150  * table 3 AVG bit settings, found at
 151  * https://www.ti.com/lit/ds/symlink/ina226.pdf.
 152  */
 153 static const int ina226_avg_tab[] = { 1, 4, 16, 64, 128, 256, 512, 1024 };
 154
 155 static int ina226_reg_to_interval(u16 config)
 156 {
 157         int avg = ina226_avg_tab[INA226_READ_AVG(config)];
 158
 159         /*
 160          * Multiply the total conversion time by the number of averages.
 161          * Return the result in milliseconds.
 162          */
 163         return DIV_ROUND_CLOSEST(avg * INA226_TOTAL_CONV_TIME_DEFAULT, 1000);
 164 }
 165
 166 /*
 167  * Return the new, shifted AVG field value of CONFIG register,
 168  * to use with regmap_update_bits
 169  */
 170 static u16 ina226_interval_to_reg(int interval)
 171 {
 172         int avg, avg_bits;
 173
 174         avg = DIV_ROUND_CLOSEST(interval * 1000,
 175                                 INA226_TOTAL_CONV_TIME_DEFAULT);
 176         avg_bits = find_closest(avg, ina226_avg_tab,
 177                                 ARRAY_SIZE(ina226_avg_tab));
 178
 179         return INA226_SHIFT_AVG(avg_bits);
 180 }
 181
 182 /*
 183  * Calibration register is set to the best value, which eliminates
 184  * truncation errors on calculating current register in hardware.
 185  * According to datasheet (eq. 3) the best values are 2048 for
 186  * ina226 and 4096 for ina219. They are hardcoded as calibration_value.
 187  */
 188 static int ina2xx_calibrate(struct ina2xx_data *data)
 189 {
 190         return regmap_write(data->regmap, INA2XX_CALIBRATION,
 191                             data->config->calibration_value);
 192 }
 193
 194 /*
 195  * Initialize the configuration and calibration registers.
 196  */
 197 static int ina2xx_init(struct ina2xx_data *data)
 198 {
 199         int ret = regmap_write(data->regmap, INA2XX_CONFIG,
 200                                data->config->config_default);
 201         if (ret < 0)
 202                 return ret;
 203
 204         return ina2xx_calibrate(data);
 205 }
 206
 207 static int ina2xx_read_reg(struct device *dev, int reg, unsigned int *regval)
 208 {
 209         struct ina2xx_data *data = dev_get_drvdata(dev);
 210         int ret, retry;
 211
 212         dev_dbg(dev, "Starting register %d read\n", reg);
 213
 214         for (retry = 5; retry; retry--) {
 215
 216                 ret = regmap_read(data->regmap, reg, regval);
 217                 if (ret < 0)
 218                         return ret;
 219
 220                 dev_dbg(dev, "read %d, val = 0x%04x\n", reg, *regval);
 221
 222                 /*
 223                  * If the current value in the calibration register is 0, the
 224                  * power and current registers will also remain at 0. In case
 225                  * the chip has been reset let's check the calibration
 226                  * register and reinitialize if needed.
 227                  * We do that extra read of the calibration register if there
 228                  * is some hint of a chip reset.
 229                  */
 230                 if (*regval == 0) {
 231                         unsigned int cal;
 232
 233                         ret = regmap_read(data->regmap, INA2XX_CALIBRATION,
 234                                           &cal);
 235                         if (ret < 0)
 236                                 return ret;
 237
 238                         if (cal == 0) {
 239                                 dev_warn(dev, "chip not calibrated, reinitializing\n");
 240
 241                                 ret = ina2xx_init(data);
 242                                 if (ret < 0)
 243                                         return ret;
 244                                 /*
 245                                  * Let's make sure the power and current
 246                                  * registers have been updated before trying
 247                                  * again.
 248                                  */
 249                                 msleep(INA2XX_MAX_DELAY);
 250                                 continue;
 251                         }
 252                 }
 253                 return 0;
 254         }
 255
 256         /*
 257          * If we're here then although all write operations succeeded, the
 258          * chip still returns 0 in the calibration register. Nothing more we
 259          * can do here.
 260          */
 261         dev_err(dev, "unable to reinitialize the chip\n");
 262         return -ENODEV;
 263 }
 264
 265 static int ina2xx_get_value(struct ina2xx_data *data, u8 reg,
 266                             unsigned int regval)
 267 {
 268         int val;
 269
 270         switch (reg) {
 271         case INA2XX_SHUNT_VOLTAGE:
 272                 /* signed register */
 273                 val = DIV_ROUND_CLOSEST((s16)regval, data->config->shunt_div);
 274                 break;
 275         case INA2XX_BUS_VOLTAGE:
 276                 val = (regval >> data->config->bus_voltage_shift)
 277                   * data->config->bus_voltage_lsb;
 278                 val = DIV_ROUND_CLOSEST(val, 1000);
 279                 break;
 280         case INA2XX_POWER:
 281                 val = regval * data->power_lsb_uW;
 282                 break;
 283         case INA2XX_CURRENT:
 284                 /* signed register, result in mA */
 285                 val = (s16)regval * data->current_lsb_uA;
 286                 val = DIV_ROUND_CLOSEST(val, 1000);
 287                 break;
 288         case INA2XX_CALIBRATION:
 289                 val = regval;
 290                 break;
 291         default:
 292                 /* programmer goofed */
 293                 WARN_ON_ONCE(1);
 294                 val = 0;
 295                 break;
 296         }
 297
 298         return val;
 299 }
 300
 301 static ssize_t ina2xx_value_show(struct device *dev,
 302                                  struct device_attribute *da, char *buf)
 303 {
 304         struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 305         struct ina2xx_data *data = dev_get_drvdata(dev);
 306         unsigned int regval;
 307
 308         int err = ina2xx_read_reg(dev, attr->index, &regval);
 309
 310         if (err < 0)
 311                 return err;
 312
 313         return snprintf(buf, PAGE_SIZE, "%d\n",
 314                         ina2xx_get_value(data, attr->index, regval));
 315 }
 316
 317 static int ina226_reg_to_alert(struct ina2xx_data *data, u8 bit, u16 regval)
 318 {
 319         int reg;
 320
 321         switch (bit) {
 322         case INA226_SHUNT_OVER_VOLTAGE_BIT:
 323         case INA226_SHUNT_UNDER_VOLTAGE_BIT:
 324                 reg = INA2XX_SHUNT_VOLTAGE;
 325                 break;
 326         case INA226_BUS_OVER_VOLTAGE_BIT:
 327         case INA226_BUS_UNDER_VOLTAGE_BIT:
 328                 reg = INA2XX_BUS_VOLTAGE;
 329                 break;
 330         case INA226_POWER_OVER_LIMIT_BIT:
 331                 reg = INA2XX_POWER;
 332                 break;
 333         default:
 334                 /* programmer goofed */
 335                 WARN_ON_ONCE(1);
 336                 return 0;
 337         }
 338
 339         return ina2xx_get_value(data, reg, regval);
 340 }
 341
 342 /*
 343  * Turns alert limit values into register values.
 344  * Opposite of the formula in ina2xx_get_value().
 345  */
 346 static s16 ina226_alert_to_reg(struct ina2xx_data *data, u8 bit, int val)
 347 {
 348         switch (bit) {
 349         case INA226_SHUNT_OVER_VOLTAGE_BIT:
 350         case INA226_SHUNT_UNDER_VOLTAGE_BIT:
 351                 val *= data->config->shunt_div;
 352                 return clamp_val(val, SHRT_MIN, SHRT_MAX);
 353         case INA226_BUS_OVER_VOLTAGE_BIT:
 354         case INA226_BUS_UNDER_VOLTAGE_BIT:
 355                 val = (val * 1000) << data->config->bus_voltage_shift;
 356                 val = DIV_ROUND_CLOSEST(val, data->config->bus_voltage_lsb);
 357                 return clamp_val(val, 0, SHRT_MAX);
 358         case INA226_POWER_OVER_LIMIT_BIT:
 359                 val = DIV_ROUND_CLOSEST(val, data->power_lsb_uW);
 360                 return clamp_val(val, 0, USHRT_MAX);
 361         default:
 362                 /* programmer goofed */
 363                 WARN_ON_ONCE(1);
 364                 return 0;
 365         }
 366 }
 367
 368 static ssize_t ina226_alert_show(struct device *dev,
 369                                  struct device_attribute *da, char *buf)
 370 {
 371         struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 372         struct ina2xx_data *data = dev_get_drvdata(dev);
 373         int regval;
 374         int val = 0;
 375         int ret;
 376
 377         mutex_lock(&data->config_lock);
 378         ret = regmap_read(data->regmap, INA226_MASK_ENABLE, &regval);
 379         if (ret)
 380                 goto abort;
 381
 382         if (regval & BIT(attr->index)) {
 383                 ret = regmap_read(data->regmap, INA226_ALERT_LIMIT, &regval);
 384                 if (ret)
 385                         goto abort;
 386                 val = ina226_reg_to_alert(data, attr->index, regval);
 387         }
 388
 389         ret = snprintf(buf, PAGE_SIZE, "%d\n", val);
 390 abort:
 391         mutex_unlock(&data->config_lock);
 392         return ret;
 393 }
 394
 395 static ssize_t ina226_alert_store(struct device *dev,
 396                                   struct device_attribute *da,
 397                                   const char *buf, size_t count)
 398 {
 399         struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 400         struct ina2xx_data *data = dev_get_drvdata(dev);
 401         unsigned long val;
 402         int ret;
 403
 404         ret = kstrtoul(buf, 10, &val);
 405         if (ret < 0)
 406                 return ret;
 407
 408         /*
 409          * Clear all alerts first to avoid accidentally triggering ALERT pin
 410          * due to register write sequence. Then, only enable the alert
 411          * if the value is non-zero.
 412          */
 413         mutex_lock(&data->config_lock);
 414         ret = regmap_update_bits(data->regmap, INA226_MASK_ENABLE,
 415                                  INA226_ALERT_CONFIG_MASK, 0);
 416         if (ret < 0)
 417                 goto abort;
 418
 419         ret = regmap_write(data->regmap, INA226_ALERT_LIMIT,
 420                            ina226_alert_to_reg(data, attr->index, val));
 421         if (ret < 0)
 422                 goto abort;
 423
 424         if (val != 0) {
 425                 ret = regmap_update_bits(data->regmap, INA226_MASK_ENABLE,
 426                                          INA226_ALERT_CONFIG_MASK,
 427                                          BIT(attr->index));
 428                 if (ret < 0)
 429                         goto abort;
 430         }
 431
 432         ret = count;
 433 abort:
 434         mutex_unlock(&data->config_lock);
 435         return ret;
 436 }
 437
 438 static ssize_t ina226_alarm_show(struct device *dev,
 439                                  struct device_attribute *da, char *buf)
 440 {
 441         struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 442         struct ina2xx_data *data = dev_get_drvdata(dev);
 443         int regval;
 444         int alarm = 0;
 445         int ret;
 446
 447         ret = regmap_read(data->regmap, INA226_MASK_ENABLE, &regval);
 448         if (ret)
 449                 return ret;
 450
 451         alarm = (regval & BIT(attr->index)) &&
 452                 (regval & INA226_ALERT_FUNCTION_FLAG);
 453         return snprintf(buf, PAGE_SIZE, "%d\n", alarm);
 454 }
 455
 456 /*
 457  * In order to keep calibration register value fixed, the product
 458  * of current_lsb and shunt_resistor should also be fixed and equal
 459  * to shunt_voltage_lsb = 1 / shunt_div multiplied by 10^9 in order
 460  * to keep the scale.
 461  */
 462 static int ina2xx_set_shunt(struct ina2xx_data *data, long val)
 463 {
 464         unsigned int dividend = DIV_ROUND_CLOSEST(1000000000,
 465                                                   data->config->shunt_div);
 466         if (val <= 0 || val > dividend)
 467                 return -EINVAL;
 468
 469         mutex_lock(&data->config_lock);
 470         data->rshunt = val;
 471         data->current_lsb_uA = DIV_ROUND_CLOSEST(dividend, val);
 472         data->power_lsb_uW = data->config->power_lsb_factor *
 473                              data->current_lsb_uA;
 474         mutex_unlock(&data->config_lock);
 475
 476         return 0;
 477 }
 478
 479 static ssize_t ina2xx_shunt_show(struct device *dev,
 480                                  struct device_attribute *da, char *buf)
 481 {
 482         struct ina2xx_data *data = dev_get_drvdata(dev);
 483
 484         return snprintf(buf, PAGE_SIZE, "%li\n", data->rshunt);
 485 }
 486
 487 static ssize_t ina2xx_shunt_store(struct device *dev,
 488                                   struct device_attribute *da,
 489                                   const char *buf, size_t count)
 490 {
 491         unsigned long val;
 492         int status;
 493         struct ina2xx_data *data = dev_get_drvdata(dev);
 494
 495         status = kstrtoul(buf, 10, &val);
 496         if (status < 0)
 497                 return status;
 498
 499         status = ina2xx_set_shunt(data, val);
 500         if (status < 0)
 501                 return status;
 502         return count;
 503 }
 504
 505 static ssize_t ina226_interval_store(struct device *dev,
 506                                      struct device_attribute *da,
 507                                      const char *buf, size_t count)
 508 {
 509         struct ina2xx_data *data = dev_get_drvdata(dev);
 510         unsigned long val;
 511         int status;
 512
 513         status = kstrtoul(buf, 10, &val);
 514         if (status < 0)
 515                 return status;
 516
 517         if (val > INT_MAX || val == 0)
 518                 return -EINVAL;
 519
 520         status = regmap_update_bits(data->regmap, INA2XX_CONFIG,
 521                                     INA226_AVG_RD_MASK,
 522                                     ina226_interval_to_reg(val));
 523         if (status < 0)
 524                 return status;
 525
 526         return count;
 527 }
 528
 529 static ssize_t ina226_interval_show(struct device *dev,
 530                                     struct device_attribute *da, char *buf)
 531 {
 532         struct ina2xx_data *data = dev_get_drvdata(dev);
 533         int status;
 534         unsigned int regval;
 535
 536         status = regmap_read(data->regmap, INA2XX_CONFIG, &regval);
 537         if (status)
 538                 return status;
 539
 540         return snprintf(buf, PAGE_SIZE, "%d\n", ina226_reg_to_interval(regval));
 541 }
 542
 543 /* shunt voltage */
 544 static SENSOR_DEVICE_ATTR_RO(in0_input, ina2xx_value, INA2XX_SHUNT_VOLTAGE);
 545 /* shunt voltage over/under voltage alert setting and alarm */
 546 static SENSOR_DEVICE_ATTR_RW(in0_crit, ina226_alert,
 547                              INA226_SHUNT_OVER_VOLTAGE_BIT);
 548 static SENSOR_DEVICE_ATTR_RW(in0_lcrit, ina226_alert,
 549                              INA226_SHUNT_UNDER_VOLTAGE_BIT);
 550 static SENSOR_DEVICE_ATTR_RO(in0_crit_alarm, ina226_alarm,
 551                              INA226_SHUNT_OVER_VOLTAGE_BIT);
 552 static SENSOR_DEVICE_ATTR_RO(in0_lcrit_alarm, ina226_alarm,
 553                              INA226_SHUNT_UNDER_VOLTAGE_BIT);
 554
 555 /* bus voltage */
 556 static SENSOR_DEVICE_ATTR_RO(in1_input, ina2xx_value, INA2XX_BUS_VOLTAGE);
 557 /* bus voltage over/under voltage alert setting and alarm */
 558 static SENSOR_DEVICE_ATTR_RW(in1_crit, ina226_alert,
 559                              INA226_BUS_OVER_VOLTAGE_BIT);
 560 static SENSOR_DEVICE_ATTR_RW(in1_lcrit, ina226_alert,
 561                              INA226_BUS_UNDER_VOLTAGE_BIT);
 562 static SENSOR_DEVICE_ATTR_RO(in1_crit_alarm, ina226_alarm,
 563                              INA226_BUS_OVER_VOLTAGE_BIT);
 564 static SENSOR_DEVICE_ATTR_RO(in1_lcrit_alarm, ina226_alarm,
 565                              INA226_BUS_UNDER_VOLTAGE_BIT);
 566
 567 /* calculated current */
 568 static SENSOR_DEVICE_ATTR_RO(curr1_input, ina2xx_value, INA2XX_CURRENT);
 569
 570 /* calculated power */
 571 static SENSOR_DEVICE_ATTR_RO(power1_input, ina2xx_value, INA2XX_POWER);
 572 /* over-limit power alert setting and alarm */
 573 static SENSOR_DEVICE_ATTR_RW(power1_crit, ina226_alert,
 574                              INA226_POWER_OVER_LIMIT_BIT);
 575 static SENSOR_DEVICE_ATTR_RO(power1_crit_alarm, ina226_alarm,
 576                              INA226_POWER_OVER_LIMIT_BIT);
 577
 578 /* shunt resistance */
 579 static SENSOR_DEVICE_ATTR_RW(shunt_resistor, ina2xx_shunt, INA2XX_CALIBRATION);
 580
 581 /* update interval (ina226 only) */
 582 static SENSOR_DEVICE_ATTR_RW(update_interval, ina226_interval, 0);
 583
 584 /* pointers to created device attributes */
 585 static struct attribute *ina2xx_attrs[] = {
 586         &sensor_dev_attr_in0_input.dev_attr.attr,
 587         &sensor_dev_attr_in1_input.dev_attr.attr,
 588         &sensor_dev_attr_curr1_input.dev_attr.attr,
 589         &sensor_dev_attr_power1_input.dev_attr.attr,
 590         &sensor_dev_attr_shunt_resistor.dev_attr.attr,
 591         NULL,
 592 };
 593
 594 static const struct attribute_group ina2xx_group = {
 595         .attrs = ina2xx_attrs,
 596 };
 597
 598 static struct attribute *ina226_attrs[] = {
 599         &sensor_dev_attr_in0_crit.dev_attr.attr,
 600         &sensor_dev_attr_in0_lcrit.dev_attr.attr,
 601         &sensor_dev_attr_in0_crit_alarm.dev_attr.attr,
 602         &sensor_dev_attr_in0_lcrit_alarm.dev_attr.attr,
 603         &sensor_dev_attr_in1_crit.dev_attr.attr,
 604         &sensor_dev_attr_in1_lcrit.dev_attr.attr,
 605         &sensor_dev_attr_in1_crit_alarm.dev_attr.attr,
 606         &sensor_dev_attr_in1_lcrit_alarm.dev_attr.attr,
 607         &sensor_dev_attr_power1_crit.dev_attr.attr,
 608         &sensor_dev_attr_power1_crit_alarm.dev_attr.attr,
 609         &sensor_dev_attr_update_interval.dev_attr.attr,
 610         NULL,
 611 };
 612
 613 static const struct attribute_group ina226_group = {
 614         .attrs = ina226_attrs,
 615 };
 616
 617 static const struct i2c_device_id ina2xx_id[];
 618
 619 static int ina2xx_probe(struct i2c_client *client)
 620 {
 621         struct device *dev = &client->dev;
 622         struct ina2xx_data *data;
 623         struct device *hwmon_dev;
 624         u32 val;
 625         int ret, group = 0;
 626         enum ina2xx_ids chip;
 627
 628         if (client->dev.of_node)
 629                 chip = (enum ina2xx_ids)of_device_get_match_data(&client->dev);
 630         else
 631                 chip = i2c_match_id(ina2xx_id, client)->driver_data;
 632
 633         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 634         if (!data)
 635                 return -ENOMEM;
 636
 637         /* set the device type */
 638         data->config = &ina2xx_config[chip];
 639         mutex_init(&data->config_lock);
 640
 641         if (of_property_read_u32(dev->of_node, "shunt-resistor", &val) < 0) {
 642                 struct ina2xx_platform_data *pdata = dev_get_platdata(dev);
 643
 644                 if (pdata)
 645                         val = pdata->shunt_uohms;
 646                 else
 647                         val = INA2XX_RSHUNT_DEFAULT;
 648         }
 649
 650         ina2xx_set_shunt(data, val);
 651
 652         ina2xx_regmap_config.max_register = data->config->registers;
 653
 654         data->regmap = devm_regmap_init_i2c(client, &ina2xx_regmap_config);
 655         if (IS_ERR(data->regmap)) {
 656                 dev_err(dev, "failed to allocate register map\n");
 657                 return PTR_ERR(data->regmap);
 658         }
 659
 660         ret = ina2xx_init(data);
 661         if (ret < 0) {
 662                 dev_err(dev, "error configuring the device: %d\n", ret);
 663                 return -ENODEV;
 664         }
 665
 666         data->groups[group++] = &ina2xx_group;
 667         if (chip == ina226)
 668                 data->groups[group++] = &ina226_group;
 669
 670         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 671                                                            data, data->groups);
 672         if (IS_ERR(hwmon_dev))
 673                 return PTR_ERR(hwmon_dev);
 674
 675         dev_info(dev, "power monitor %s (Rshunt = %li uOhm)\n",
 676                  client->name, data->rshunt);
 677
 678         return 0;
 679 }
 680
 681 static const struct i2c_device_id ina2xx_id[] = {
 682         { "ina219", ina219 },
 683         { "ina220", ina219 },
 684         { "ina226", ina226 },
 685         { "ina230", ina226 },
 686         { "ina231", ina226 },
 687         { }
 688 };
 689 MODULE_DEVICE_TABLE(i2c, ina2xx_id);
 690
 691 static const struct of_device_id __maybe_unused ina2xx_of_match[] = {
 692         {
 693                 .compatible = "ti,ina219",
 694                 .data = (void *)ina219
 695         },
 696         {
 697                 .compatible = "ti,ina220",
 698                 .data = (void *)ina219
 699         },
 700         {
 701                 .compatible = "ti,ina226",
 702                 .data = (void *)ina226
 703         },
 704         {
 705                 .compatible = "ti,ina230",
 706                 .data = (void *)ina226
 707         },
 708         {
 709                 .compatible = "ti,ina231",
 710                 .data = (void *)ina226
 711         },
 712         { },
 713 };
 714 MODULE_DEVICE_TABLE(of, ina2xx_of_match);
 715
 716 static struct i2c_driver ina2xx_driver = {
 717         .driver = {
 718                 .name   = "ina2xx",
 719                 .of_match_table = of_match_ptr(ina2xx_of_match),
 720         },
 721         .probe_new      = ina2xx_probe,
 722         .id_table       = ina2xx_id,
 723 };
 724
 725 module_i2c_driver(ina2xx_driver);
 726
 727 MODULE_AUTHOR("Lothar Felten <l-felten@ti.com>");
 728 MODULE_DESCRIPTION("ina2xx driver");
 729 MODULE_LICENSE("GPL");