drivers/hwmon/ltc2945.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Driver for Linear Technology LTC2945 I2C Power Monitor
   4  *
   5  * Copyright (c) 2014 Guenter Roeck
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/module.h>
  10 #include <linux/err.h>
  11 #include <linux/slab.h>
  12 #include <linux/i2c.h>
  13 #include <linux/hwmon.h>
  14 #include <linux/hwmon-sysfs.h>
  15 #include <linux/jiffies.h>
  16 #include <linux/regmap.h>
  17
  18 /* chip registers */
  19 #define LTC2945_CONTROL                 0x00
  20 #define LTC2945_ALERT                   0x01
  21 #define LTC2945_STATUS                  0x02
  22 #define LTC2945_FAULT                   0x03
  23 #define LTC2945_POWER_H                 0x05
  24 #define LTC2945_MAX_POWER_H             0x08
  25 #define LTC2945_MIN_POWER_H             0x0b
  26 #define LTC2945_MAX_POWER_THRES_H       0x0e
  27 #define LTC2945_MIN_POWER_THRES_H       0x11
  28 #define LTC2945_SENSE_H                 0x14
  29 #define LTC2945_MAX_SENSE_H             0x16
  30 #define LTC2945_MIN_SENSE_H             0x18
  31 #define LTC2945_MAX_SENSE_THRES_H       0x1a
  32 #define LTC2945_MIN_SENSE_THRES_H       0x1c
  33 #define LTC2945_VIN_H                   0x1e
  34 #define LTC2945_MAX_VIN_H               0x20
  35 #define LTC2945_MIN_VIN_H               0x22
  36 #define LTC2945_MAX_VIN_THRES_H         0x24
  37 #define LTC2945_MIN_VIN_THRES_H         0x26
  38 #define LTC2945_ADIN_H                  0x28
  39 #define LTC2945_MAX_ADIN_H              0x2a
  40 #define LTC2945_MIN_ADIN_H              0x2c
  41 #define LTC2945_MAX_ADIN_THRES_H        0x2e
  42 #define LTC2945_MIN_ADIN_THRES_H        0x30
  43 #define LTC2945_MIN_ADIN_THRES_L        0x31
  44
  45 /* Fault register bits */
  46
  47 #define FAULT_ADIN_UV           (1 << 0)
  48 #define FAULT_ADIN_OV           (1 << 1)
  49 #define FAULT_VIN_UV            (1 << 2)
  50 #define FAULT_VIN_OV            (1 << 3)
  51 #define FAULT_SENSE_UV          (1 << 4)
  52 #define FAULT_SENSE_OV          (1 << 5)
  53 #define FAULT_POWER_UV          (1 << 6)
  54 #define FAULT_POWER_OV          (1 << 7)
  55
  56 /* Control register bits */
  57
  58 #define CONTROL_MULT_SELECT     (1 << 0)
  59 #define CONTROL_TEST_MODE       (1 << 4)
  60
  61 static const struct of_device_id __maybe_unused ltc2945_of_match[] = {
  62         { .compatible = "adi,ltc2945" },
  63         { }
  64 };
  65 MODULE_DEVICE_TABLE(of, ltc2945_of_match);
  66
  67 /**
  68  * struct ltc2945_data - LTC2945 device data
  69  * @regmap: regmap device
  70  * @shunt_resistor: shunt resistor value in micro ohms (1000 by default)
  71  */
  72 struct ltc2945_data {
  73         struct regmap *regmap;
  74         u32 shunt_resistor;
  75 };
  76
  77 static inline bool is_power_reg(u8 reg)
  78 {
  79         return reg < LTC2945_SENSE_H;
  80 }
  81
  82 /* Return the value from the given register in uW, mV, or mA */
  83 static long long ltc2945_reg_to_val(struct device *dev, u8 reg)
  84 {
  85         struct ltc2945_data *data = dev_get_drvdata(dev);
  86         struct regmap *regmap = data->regmap;
  87         u32 shunt_resistor = data->shunt_resistor;
  88         unsigned int control;
  89         u8 buf[3];
  90         long long val;
  91         int ret;
  92
  93         ret = regmap_bulk_read(regmap, reg, buf,
  94                                is_power_reg(reg) ? 3 : 2);
  95         if (ret < 0)
  96                 return ret;
  97
  98         if (is_power_reg(reg)) {
  99                 /* 24-bit power */
 100                 val = (buf[0] << 16) + (buf[1] << 8) + buf[2];
 101         } else {
 102                 /* 12-bit current, voltage */
 103                 val = (buf[0] << 4) + (buf[1] >> 4);
 104         }
 105
 106         switch (reg) {
 107         case LTC2945_POWER_H:
 108         case LTC2945_MAX_POWER_H:
 109         case LTC2945_MIN_POWER_H:
 110         case LTC2945_MAX_POWER_THRES_H:
 111         case LTC2945_MIN_POWER_THRES_H:
 112                 /*
 113                  * Convert to uW
 114                  * Control register bit 0 selects if voltage at SENSE+/VDD
 115                  * or voltage at ADIN is used to measure power.
 116                  */
 117                 ret = regmap_read(regmap, LTC2945_CONTROL, &control);
 118                 if (ret < 0)
 119                         return ret;
 120                 if (control & CONTROL_MULT_SELECT) {
 121                         /* 25 mV * 25 uV = 0.625 uV resolution. */
 122                         val *= 625LL;
 123                 } else {
 124                         /* 0.5 mV * 25 uV = 0.0125 uV resolution. */
 125                         val = (val * 25LL) >> 1;
 126                 }
 127                 val *= 1000;
 128                 /* Overflow check: Assuming max 24-bit power, val is at most 53 bits right now. */
 129                 val = DIV_ROUND_CLOSEST_ULL(val, shunt_resistor);
 130                 /*
 131                  * Overflow check: After division, depending on shunt resistor,
 132                  * val can still be > 32 bits so returning long long makes sense
 133                  */
 134
 135                 break;
 136         case LTC2945_VIN_H:
 137         case LTC2945_MAX_VIN_H:
 138         case LTC2945_MIN_VIN_H:
 139         case LTC2945_MAX_VIN_THRES_H:
 140         case LTC2945_MIN_VIN_THRES_H:
 141                 /* 25 mV resolution. Convert to mV. */
 142                 val *= 25;
 143                 break;
 144         case LTC2945_ADIN_H:
 145         case LTC2945_MAX_ADIN_H:
 146         case LTC2945_MIN_ADIN_THRES_H:
 147         case LTC2945_MAX_ADIN_THRES_H:
 148         case LTC2945_MIN_ADIN_H:
 149                 /* 0.5mV resolution. Convert to mV. */
 150                 val = val >> 1;
 151                 break;
 152         case LTC2945_SENSE_H:
 153         case LTC2945_MAX_SENSE_H:
 154         case LTC2945_MIN_SENSE_H:
 155         case LTC2945_MAX_SENSE_THRES_H:
 156         case LTC2945_MIN_SENSE_THRES_H:
 157                 /* 25 uV resolution. Convert to mA. */
 158                 val *= 25 * 1000;
 159                 /* Overflow check: Assuming max 12-bit sense, val is at most 27 bits right now */
 160                 val = DIV_ROUND_CLOSEST_ULL(val, shunt_resistor);
 161                 /* Overflow check: After division, <= 27 bits */
 162                 break;
 163         default:
 164                 return -EINVAL;
 165         }
 166         return val;
 167 }
 168
 169 static long long ltc2945_val_to_reg(struct device *dev, u8 reg,
 170                                     unsigned long long val)
 171 {
 172         struct ltc2945_data *data = dev_get_drvdata(dev);
 173         struct regmap *regmap = data->regmap;
 174         u32 shunt_resistor = data->shunt_resistor;
 175         unsigned int control;
 176         int ret;
 177
 178         /* Ensure we don't overflow */
 179         val = clamp_val(val, 0, U32_MAX);
 180
 181         switch (reg) {
 182         case LTC2945_POWER_H:
 183         case LTC2945_MAX_POWER_H:
 184         case LTC2945_MIN_POWER_H:
 185         case LTC2945_MAX_POWER_THRES_H:
 186         case LTC2945_MIN_POWER_THRES_H:
 187                 /*
 188                  * Control register bit 0 selects if voltage at SENSE+/VDD
 189                  * or voltage at ADIN is used to measure power, which in turn
 190                  * determines register calculations.
 191                  */
 192                 ret = regmap_read(regmap, LTC2945_CONTROL, &control);
 193                 if (ret < 0)
 194                         return ret;
 195                 if (control & CONTROL_MULT_SELECT) {
 196                         /* 25 mV * 25 uV = 0.625 uV resolution. */
 197                         val *= shunt_resistor;
 198                         /* Overflow check: Assuming 32-bit val and shunt resistor, val <= 64bits */
 199                         val = DIV_ROUND_CLOSEST_ULL(val, 625 * 1000);
 200                         /* Overflow check: val is now <= 44 bits */
 201                 } else {
 202                         /* 0.5 mV * 25 uV = 0.0125 uV resolution. */
 203                         val *= shunt_resistor;
 204                         /* Overflow check: Assuming 32-bit val and shunt resistor, val <= 64bits */
 205                         val = DIV_ROUND_CLOSEST_ULL(val, 25 * 1000) * 2;
 206                         /* Overflow check: val is now <= 51 bits */
 207                 }
 208                 break;
 209         case LTC2945_VIN_H:
 210         case LTC2945_MAX_VIN_H:
 211         case LTC2945_MIN_VIN_H:
 212         case LTC2945_MAX_VIN_THRES_H:
 213         case LTC2945_MIN_VIN_THRES_H:
 214                 /* 25 mV resolution. */
 215                 val = DIV_ROUND_CLOSEST_ULL(val, 25);
 216                 break;
 217         case LTC2945_ADIN_H:
 218         case LTC2945_MAX_ADIN_H:
 219         case LTC2945_MIN_ADIN_THRES_H:
 220         case LTC2945_MAX_ADIN_THRES_H:
 221         case LTC2945_MIN_ADIN_H:
 222                 /* 0.5mV resolution. */
 223                 val *= 2;
 224                 break;
 225         case LTC2945_SENSE_H:
 226         case LTC2945_MAX_SENSE_H:
 227         case LTC2945_MIN_SENSE_H:
 228         case LTC2945_MAX_SENSE_THRES_H:
 229         case LTC2945_MIN_SENSE_THRES_H:
 230                 /* 25 uV resolution. Convert to  mA. */
 231                 val *= shunt_resistor;
 232                 /* Overflow check: Assuming 32-bit val and 32-bit shunt resistor, val is 64bits */
 233                 val = DIV_ROUND_CLOSEST_ULL(val, 25 * 1000);
 234                 /* Overflow check: val is now <= 50 bits */
 235                 break;
 236         default:
 237                 return -EINVAL;
 238         }
 239         return val;
 240 }
 241
 242 static ssize_t ltc2945_value_show(struct device *dev,
 243                                   struct device_attribute *da, char *buf)
 244 {
 245         struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 246         long long value;
 247
 248         value = ltc2945_reg_to_val(dev, attr->index);
 249         if (value < 0)
 250                 return value;
 251         return sysfs_emit(buf, "%lld\n", value);
 252 }
 253
 254 static ssize_t ltc2945_value_store(struct device *dev,
 255                                    struct device_attribute *da,
 256                                    const char *buf, size_t count)
 257 {
 258         struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 259         struct ltc2945_data *data = dev_get_drvdata(dev);
 260         struct regmap *regmap = data->regmap;
 261         u8 reg = attr->index;
 262         unsigned int val;
 263         u8 regbuf[3];
 264         int num_regs;
 265         long long regval;
 266         int ret;
 267
 268         ret = kstrtouint(buf, 10, &val);
 269         if (ret)
 270                 return ret;
 271
 272         /* convert to register value, then clamp and write result */
 273         regval = ltc2945_val_to_reg(dev, reg, val);
 274         if (regval < 0)
 275                 return regval;
 276         if (is_power_reg(reg)) {
 277                 regval = clamp_val(regval, 0, 0xffffff);
 278                 regbuf[0] = regval >> 16;
 279                 regbuf[1] = (regval >> 8) & 0xff;
 280                 regbuf[2] = regval;
 281                 num_regs = 3;
 282         } else {
 283                 regval = clamp_val(regval, 0, 0xfff) << 4;
 284                 regbuf[0] = regval >> 8;
 285                 regbuf[1] = regval & 0xff;
 286                 num_regs = 2;
 287         }
 288         ret = regmap_bulk_write(regmap, reg, regbuf, num_regs);
 289         return ret < 0 ? ret : count;
 290 }
 291
 292 static ssize_t ltc2945_history_store(struct device *dev,
 293                                      struct device_attribute *da,
 294                                      const char *buf, size_t count)
 295 {
 296         struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 297         struct ltc2945_data *data = dev_get_drvdata(dev);
 298         struct regmap *regmap = data->regmap;
 299         u8 reg = attr->index;
 300         int num_regs = is_power_reg(reg) ? 3 : 2;
 301         u8 buf_min[3] = { 0xff, 0xff, 0xff };
 302         u8 buf_max[3] = { 0, 0, 0 };
 303         unsigned long val;
 304         int ret;
 305
 306         ret = kstrtoul(buf, 10, &val);
 307         if (ret)
 308                 return ret;
 309         if (val != 1)
 310                 return -EINVAL;
 311
 312         ret = regmap_update_bits(regmap, LTC2945_CONTROL, CONTROL_TEST_MODE,
 313                                  CONTROL_TEST_MODE);
 314
 315         /* Reset minimum */
 316         ret = regmap_bulk_write(regmap, reg, buf_min, num_regs);
 317         if (ret)
 318                 return ret;
 319
 320         switch (reg) {
 321         case LTC2945_MIN_POWER_H:
 322                 reg = LTC2945_MAX_POWER_H;
 323                 break;
 324         case LTC2945_MIN_SENSE_H:
 325                 reg = LTC2945_MAX_SENSE_H;
 326                 break;
 327         case LTC2945_MIN_VIN_H:
 328                 reg = LTC2945_MAX_VIN_H;
 329                 break;
 330         case LTC2945_MIN_ADIN_H:
 331                 reg = LTC2945_MAX_ADIN_H;
 332                 break;
 333         default:
 334                 WARN_ONCE(1, "Bad register: 0x%x\n", reg);
 335                 return -EINVAL;
 336         }
 337         /* Reset maximum */
 338         ret = regmap_bulk_write(regmap, reg, buf_max, num_regs);
 339
 340         /* Try resetting test mode even if there was an error */
 341         regmap_update_bits(regmap, LTC2945_CONTROL, CONTROL_TEST_MODE, 0);
 342
 343         return ret ? : count;
 344 }
 345
 346 static ssize_t ltc2945_bool_show(struct device *dev,
 347                                  struct device_attribute *da, char *buf)
 348 {
 349         struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 350         struct ltc2945_data *data = dev_get_drvdata(dev);
 351         struct regmap *regmap = data->regmap;
 352         unsigned int fault;
 353         int ret;
 354
 355         ret = regmap_read(regmap, LTC2945_FAULT, &fault);
 356         if (ret < 0)
 357                 return ret;
 358
 359         fault &= attr->index;
 360         if (fault)              /* Clear reported faults in chip register */
 361                 regmap_update_bits(regmap, LTC2945_FAULT, attr->index, 0);
 362
 363         return sysfs_emit(buf, "%d\n", !!fault);
 364 }
 365
 366 /* Input voltages */
 367
 368 static SENSOR_DEVICE_ATTR_RO(in1_input, ltc2945_value, LTC2945_VIN_H);
 369 static SENSOR_DEVICE_ATTR_RW(in1_min, ltc2945_value, LTC2945_MIN_VIN_THRES_H);
 370 static SENSOR_DEVICE_ATTR_RW(in1_max, ltc2945_value, LTC2945_MAX_VIN_THRES_H);
 371 static SENSOR_DEVICE_ATTR_RO(in1_lowest, ltc2945_value, LTC2945_MIN_VIN_H);
 372 static SENSOR_DEVICE_ATTR_RO(in1_highest, ltc2945_value, LTC2945_MAX_VIN_H);
 373 static SENSOR_DEVICE_ATTR_WO(in1_reset_history, ltc2945_history,
 374                              LTC2945_MIN_VIN_H);
 375
 376 static SENSOR_DEVICE_ATTR_RO(in2_input, ltc2945_value, LTC2945_ADIN_H);
 377 static SENSOR_DEVICE_ATTR_RW(in2_min, ltc2945_value, LTC2945_MIN_ADIN_THRES_H);
 378 static SENSOR_DEVICE_ATTR_RW(in2_max, ltc2945_value, LTC2945_MAX_ADIN_THRES_H);
 379 static SENSOR_DEVICE_ATTR_RO(in2_lowest, ltc2945_value, LTC2945_MIN_ADIN_H);
 380 static SENSOR_DEVICE_ATTR_RO(in2_highest, ltc2945_value, LTC2945_MAX_ADIN_H);
 381 static SENSOR_DEVICE_ATTR_WO(in2_reset_history, ltc2945_history,
 382                              LTC2945_MIN_ADIN_H);
 383
 384 /* Voltage alarms */
 385
 386 static SENSOR_DEVICE_ATTR_RO(in1_min_alarm, ltc2945_bool, FAULT_VIN_UV);
 387 static SENSOR_DEVICE_ATTR_RO(in1_max_alarm, ltc2945_bool, FAULT_VIN_OV);
 388 static SENSOR_DEVICE_ATTR_RO(in2_min_alarm, ltc2945_bool, FAULT_ADIN_UV);
 389 static SENSOR_DEVICE_ATTR_RO(in2_max_alarm, ltc2945_bool, FAULT_ADIN_OV);
 390
 391 /* Currents (via sense resistor) */
 392
 393 static SENSOR_DEVICE_ATTR_RO(curr1_input, ltc2945_value, LTC2945_SENSE_H);
 394 static SENSOR_DEVICE_ATTR_RW(curr1_min, ltc2945_value,
 395                              LTC2945_MIN_SENSE_THRES_H);
 396 static SENSOR_DEVICE_ATTR_RW(curr1_max, ltc2945_value,
 397                              LTC2945_MAX_SENSE_THRES_H);
 398 static SENSOR_DEVICE_ATTR_RO(curr1_lowest, ltc2945_value, LTC2945_MIN_SENSE_H);
 399 static SENSOR_DEVICE_ATTR_RO(curr1_highest, ltc2945_value,
 400                              LTC2945_MAX_SENSE_H);
 401 static SENSOR_DEVICE_ATTR_WO(curr1_reset_history, ltc2945_history,
 402                              LTC2945_MIN_SENSE_H);
 403
 404 /* Current alarms */
 405
 406 static SENSOR_DEVICE_ATTR_RO(curr1_min_alarm, ltc2945_bool, FAULT_SENSE_UV);
 407 static SENSOR_DEVICE_ATTR_RO(curr1_max_alarm, ltc2945_bool, FAULT_SENSE_OV);
 408
 409 /* Power */
 410
 411 static SENSOR_DEVICE_ATTR_RO(power1_input, ltc2945_value, LTC2945_POWER_H);
 412 static SENSOR_DEVICE_ATTR_RW(power1_min, ltc2945_value,
 413                              LTC2945_MIN_POWER_THRES_H);
 414 static SENSOR_DEVICE_ATTR_RW(power1_max, ltc2945_value,
 415                              LTC2945_MAX_POWER_THRES_H);
 416 static SENSOR_DEVICE_ATTR_RO(power1_input_lowest, ltc2945_value,
 417                              LTC2945_MIN_POWER_H);
 418 static SENSOR_DEVICE_ATTR_RO(power1_input_highest, ltc2945_value,
 419                              LTC2945_MAX_POWER_H);
 420 static SENSOR_DEVICE_ATTR_WO(power1_reset_history, ltc2945_history,
 421                              LTC2945_MIN_POWER_H);
 422
 423 /* Power alarms */
 424
 425 static SENSOR_DEVICE_ATTR_RO(power1_min_alarm, ltc2945_bool, FAULT_POWER_UV);
 426 static SENSOR_DEVICE_ATTR_RO(power1_max_alarm, ltc2945_bool, FAULT_POWER_OV);
 427
 428 static struct attribute *ltc2945_attrs[] = {
 429         &sensor_dev_attr_in1_input.dev_attr.attr,
 430         &sensor_dev_attr_in1_min.dev_attr.attr,
 431         &sensor_dev_attr_in1_max.dev_attr.attr,
 432         &sensor_dev_attr_in1_lowest.dev_attr.attr,
 433         &sensor_dev_attr_in1_highest.dev_attr.attr,
 434         &sensor_dev_attr_in1_reset_history.dev_attr.attr,
 435         &sensor_dev_attr_in1_min_alarm.dev_attr.attr,
 436         &sensor_dev_attr_in1_max_alarm.dev_attr.attr,
 437
 438         &sensor_dev_attr_in2_input.dev_attr.attr,
 439         &sensor_dev_attr_in2_min.dev_attr.attr,
 440         &sensor_dev_attr_in2_max.dev_attr.attr,
 441         &sensor_dev_attr_in2_lowest.dev_attr.attr,
 442         &sensor_dev_attr_in2_highest.dev_attr.attr,
 443         &sensor_dev_attr_in2_reset_history.dev_attr.attr,
 444         &sensor_dev_attr_in2_min_alarm.dev_attr.attr,
 445         &sensor_dev_attr_in2_max_alarm.dev_attr.attr,
 446
 447         &sensor_dev_attr_curr1_input.dev_attr.attr,
 448         &sensor_dev_attr_curr1_min.dev_attr.attr,
 449         &sensor_dev_attr_curr1_max.dev_attr.attr,
 450         &sensor_dev_attr_curr1_lowest.dev_attr.attr,
 451         &sensor_dev_attr_curr1_highest.dev_attr.attr,
 452         &sensor_dev_attr_curr1_reset_history.dev_attr.attr,
 453         &sensor_dev_attr_curr1_min_alarm.dev_attr.attr,
 454         &sensor_dev_attr_curr1_max_alarm.dev_attr.attr,
 455
 456         &sensor_dev_attr_power1_input.dev_attr.attr,
 457         &sensor_dev_attr_power1_min.dev_attr.attr,
 458         &sensor_dev_attr_power1_max.dev_attr.attr,
 459         &sensor_dev_attr_power1_input_lowest.dev_attr.attr,
 460         &sensor_dev_attr_power1_input_highest.dev_attr.attr,
 461         &sensor_dev_attr_power1_reset_history.dev_attr.attr,
 462         &sensor_dev_attr_power1_min_alarm.dev_attr.attr,
 463         &sensor_dev_attr_power1_max_alarm.dev_attr.attr,
 464
 465         NULL,
 466 };
 467 ATTRIBUTE_GROUPS(ltc2945);
 468
 469 static const struct regmap_config ltc2945_regmap_config = {
 470         .reg_bits = 8,
 471         .val_bits = 8,
 472         .max_register = LTC2945_MIN_ADIN_THRES_L,
 473 };
 474
 475 static int ltc2945_probe(struct i2c_client *client)
 476 {
 477         struct device *dev = &client->dev;
 478         struct device *hwmon_dev;
 479         struct regmap *regmap;
 480         struct ltc2945_data *data;
 481
 482         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 483         if (!data)
 484                 return -ENOMEM;
 485         dev_set_drvdata(dev, data);
 486
 487         regmap = devm_regmap_init_i2c(client, &ltc2945_regmap_config);
 488         if (IS_ERR(regmap)) {
 489                 dev_err(dev, "failed to allocate register map\n");
 490                 return PTR_ERR(regmap);
 491         }
 492
 493         data->regmap = regmap;
 494         if (device_property_read_u32(dev, "shunt-resistor-micro-ohms",
 495                                      &data->shunt_resistor))
 496                 data->shunt_resistor = 1000;
 497
 498         if (data->shunt_resistor == 0)
 499                 return -EINVAL;
 500
 501         /* Clear faults */
 502         regmap_write(regmap, LTC2945_FAULT, 0x00);
 503
 504         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 505                                                            data,
 506                                                            ltc2945_groups);
 507         return PTR_ERR_OR_ZERO(hwmon_dev);
 508 }
 509
 510 static const struct i2c_device_id ltc2945_id[] = {
 511         {"ltc2945", 0},
 512         { }
 513 };
 514
 515 MODULE_DEVICE_TABLE(i2c, ltc2945_id);
 516
 517 static struct i2c_driver ltc2945_driver = {
 518         .driver = {
 519                 .name = "ltc2945",
 520                 .of_match_table = of_match_ptr(ltc2945_of_match),
 521         },
 522         .probe = ltc2945_probe,
 523         .id_table = ltc2945_id,
 524 };
 525
 526 module_i2c_driver(ltc2945_driver);
 527
 528 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
 529 MODULE_DESCRIPTION("LTC2945 driver");
 530 MODULE_LICENSE("GPL");