drivers/power/supply/ds2781_battery.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * 1-wire client/driver for the Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC
   4  *
   5  * Author: Renata Sayakhova <renata@oktetlabs.ru>
   6  *
   7  * Based on ds2780_battery drivers
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/slab.h>
  12 #include <linux/param.h>
  13 #include <linux/pm.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/power_supply.h>
  16 #include <linux/idr.h>
  17
  18 #include <linux/w1.h>
  19 #include "../../w1/slaves/w1_ds2781.h"
  20
  21 /* Current unit measurement in uA for a 1 milli-ohm sense resistor */
  22 #define DS2781_CURRENT_UNITS    1563
  23 /* Charge unit measurement in uAh for a 1 milli-ohm sense resistor */
  24 #define DS2781_CHARGE_UNITS             6250
  25 /* Number of bytes in user EEPROM space */
  26 #define DS2781_USER_EEPROM_SIZE         (DS2781_EEPROM_BLOCK0_END - \
  27                                         DS2781_EEPROM_BLOCK0_START + 1)
  28 /* Number of bytes in parameter EEPROM space */
  29 #define DS2781_PARAM_EEPROM_SIZE        (DS2781_EEPROM_BLOCK1_END - \
  30                                         DS2781_EEPROM_BLOCK1_START + 1)
  31
  32 struct ds2781_device_info {
  33         struct device *dev;
  34         struct power_supply *bat;
  35         struct power_supply_desc bat_desc;
  36         struct device *w1_dev;
  37 };
  38
  39 enum current_types {
  40         CURRENT_NOW,
  41         CURRENT_AVG,
  42 };
  43
  44 static const char model[] = "DS2781";
  45 static const char manufacturer[] = "Maxim/Dallas";
  46
  47 static inline struct ds2781_device_info *
  48 to_ds2781_device_info(struct power_supply *psy)
  49 {
  50         return power_supply_get_drvdata(psy);
  51 }
  52
  53 static inline int ds2781_battery_io(struct ds2781_device_info *dev_info,
  54         char *buf, int addr, size_t count, int io)
  55 {
  56         return w1_ds2781_io(dev_info->w1_dev, buf, addr, count, io);
  57 }
  58
  59 static int w1_ds2781_read(struct ds2781_device_info *dev_info, char *buf,
  60                 int addr, size_t count)
  61 {
  62         return ds2781_battery_io(dev_info, buf, addr, count, 0);
  63 }
  64
  65 static inline int ds2781_read8(struct ds2781_device_info *dev_info, u8 *val,
  66         int addr)
  67 {
  68         return ds2781_battery_io(dev_info, val, addr, sizeof(u8), 0);
  69 }
  70
  71 static int ds2781_read16(struct ds2781_device_info *dev_info, s16 *val,
  72         int addr)
  73 {
  74         int ret;
  75         u8 raw[2];
  76
  77         ret = ds2781_battery_io(dev_info, raw, addr, sizeof(raw), 0);
  78         if (ret < 0)
  79                 return ret;
  80
  81         *val = (raw[0] << 8) | raw[1];
  82
  83         return 0;
  84 }
  85
  86 static inline int ds2781_read_block(struct ds2781_device_info *dev_info,
  87         u8 *val, int addr, size_t count)
  88 {
  89         return ds2781_battery_io(dev_info, val, addr, count, 0);
  90 }
  91
  92 static inline int ds2781_write(struct ds2781_device_info *dev_info, u8 *val,
  93         int addr, size_t count)
  94 {
  95         return ds2781_battery_io(dev_info, val, addr, count, 1);
  96 }
  97
  98 static inline int ds2781_store_eeprom(struct device *dev, int addr)
  99 {
 100         return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_COPY_DATA);
 101 }
 102
 103 static inline int ds2781_recall_eeprom(struct device *dev, int addr)
 104 {
 105         return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_RECALL_DATA);
 106 }
 107
 108 static int ds2781_save_eeprom(struct ds2781_device_info *dev_info, int reg)
 109 {
 110         int ret;
 111
 112         ret = ds2781_store_eeprom(dev_info->w1_dev, reg);
 113         if (ret < 0)
 114                 return ret;
 115
 116         ret = ds2781_recall_eeprom(dev_info->w1_dev, reg);
 117         if (ret < 0)
 118                 return ret;
 119
 120         return 0;
 121 }
 122
 123 /* Set sense resistor value in mhos */
 124 static int ds2781_set_sense_register(struct ds2781_device_info *dev_info,
 125         u8 conductance)
 126 {
 127         int ret;
 128
 129         ret = ds2781_write(dev_info, &conductance,
 130                                 DS2781_RSNSP, sizeof(u8));
 131         if (ret < 0)
 132                 return ret;
 133
 134         return ds2781_save_eeprom(dev_info, DS2781_RSNSP);
 135 }
 136
 137 /* Get RSGAIN value from 0 to 1.999 in steps of 0.001 */
 138 static int ds2781_get_rsgain_register(struct ds2781_device_info *dev_info,
 139         u16 *rsgain)
 140 {
 141         return ds2781_read16(dev_info, rsgain, DS2781_RSGAIN_MSB);
 142 }
 143
 144 /* Set RSGAIN value from 0 to 1.999 in steps of 0.001 */
 145 static int ds2781_set_rsgain_register(struct ds2781_device_info *dev_info,
 146         u16 rsgain)
 147 {
 148         int ret;
 149         u8 raw[] = {rsgain >> 8, rsgain & 0xFF};
 150
 151         ret = ds2781_write(dev_info, raw,
 152                                 DS2781_RSGAIN_MSB, sizeof(raw));
 153         if (ret < 0)
 154                 return ret;
 155
 156         return ds2781_save_eeprom(dev_info, DS2781_RSGAIN_MSB);
 157 }
 158
 159 static int ds2781_get_voltage(struct ds2781_device_info *dev_info,
 160         int *voltage_uV)
 161 {
 162         int ret;
 163         char val[2];
 164         int voltage_raw;
 165
 166         ret = w1_ds2781_read(dev_info, val, DS2781_VOLT_MSB, 2 * sizeof(u8));
 167         if (ret < 0)
 168                 return ret;
 169         /*
 170          * The voltage value is located in 10 bits across the voltage MSB
 171          * and LSB registers in two's complement form
 172          * Sign bit of the voltage value is in bit 7 of the voltage MSB register
 173          * Bits 9 - 3 of the voltage value are in bits 6 - 0 of the
 174          * voltage MSB register
 175          * Bits 2 - 0 of the voltage value are in bits 7 - 5 of the
 176          * voltage LSB register
 177          */
 178         voltage_raw = (val[0] << 3) |
 179                 (val[1] >> 5);
 180
 181         /* DS2781 reports voltage in units of 9.76mV, but the battery class
 182          * reports in units of uV, so convert by multiplying by 9760. */
 183         *voltage_uV = voltage_raw * 9760;
 184
 185         return 0;
 186 }
 187
 188 static int ds2781_get_temperature(struct ds2781_device_info *dev_info,
 189         int *temp)
 190 {
 191         int ret;
 192         char val[2];
 193         int temp_raw;
 194
 195         ret = w1_ds2781_read(dev_info, val, DS2781_TEMP_MSB, 2 * sizeof(u8));
 196         if (ret < 0)
 197                 return ret;
 198         /*
 199          * The temperature value is located in 10 bits across the temperature
 200          * MSB and LSB registers in two's complement form
 201          * Sign bit of the temperature value is in bit 7 of the temperature
 202          * MSB register
 203          * Bits 9 - 3 of the temperature value are in bits 6 - 0 of the
 204          * temperature MSB register
 205          * Bits 2 - 0 of the temperature value are in bits 7 - 5 of the
 206          * temperature LSB register
 207          */
 208         temp_raw = ((val[0]) << 3) |
 209                 (val[1] >> 5);
 210         *temp = temp_raw + (temp_raw / 4);
 211
 212         return 0;
 213 }
 214
 215 static int ds2781_get_current(struct ds2781_device_info *dev_info,
 216         enum current_types type, int *current_uA)
 217 {
 218         int ret, sense_res;
 219         s16 current_raw;
 220         u8 sense_res_raw, reg_msb;
 221
 222         /*
 223          * The units of measurement for current are dependent on the value of
 224          * the sense resistor.
 225          */
 226         ret = ds2781_read8(dev_info, &sense_res_raw, DS2781_RSNSP);
 227         if (ret < 0)
 228                 return ret;
 229
 230         if (sense_res_raw == 0) {
 231                 dev_err(dev_info->dev, "sense resistor value is 0\n");
 232                 return -EINVAL;
 233         }
 234         sense_res = 1000 / sense_res_raw;
 235
 236         if (type == CURRENT_NOW)
 237                 reg_msb = DS2781_CURRENT_MSB;
 238         else if (type == CURRENT_AVG)
 239                 reg_msb = DS2781_IAVG_MSB;
 240         else
 241                 return -EINVAL;
 242
 243         /*
 244          * The current value is located in 16 bits across the current MSB
 245          * and LSB registers in two's complement form
 246          * Sign bit of the current value is in bit 7 of the current MSB register
 247          * Bits 14 - 8 of the current value are in bits 6 - 0 of the current
 248          * MSB register
 249          * Bits 7 - 0 of the current value are in bits 7 - 0 of the current
 250          * LSB register
 251          */
 252         ret = ds2781_read16(dev_info, &current_raw, reg_msb);
 253         if (ret < 0)
 254                 return ret;
 255
 256         *current_uA = current_raw * (DS2781_CURRENT_UNITS / sense_res);
 257         return 0;
 258 }
 259
 260 static int ds2781_get_accumulated_current(struct ds2781_device_info *dev_info,
 261         int *accumulated_current)
 262 {
 263         int ret, sense_res;
 264         s16 current_raw;
 265         u8 sense_res_raw;
 266
 267         /*
 268          * The units of measurement for accumulated current are dependent on
 269          * the value of the sense resistor.
 270          */
 271         ret = ds2781_read8(dev_info, &sense_res_raw, DS2781_RSNSP);
 272         if (ret < 0)
 273                 return ret;
 274
 275         if (sense_res_raw == 0) {
 276                 dev_err(dev_info->dev, "sense resistor value is 0\n");
 277                 return -EINVAL;
 278         }
 279         sense_res = 1000 / sense_res_raw;
 280
 281         /*
 282          * The ACR value is located in 16 bits across the ACR MSB and
 283          * LSB registers
 284          * Bits 15 - 8 of the ACR value are in bits 7 - 0 of the ACR
 285          * MSB register
 286          * Bits 7 - 0 of the ACR value are in bits 7 - 0 of the ACR
 287          * LSB register
 288          */
 289         ret = ds2781_read16(dev_info, &current_raw, DS2781_ACR_MSB);
 290         if (ret < 0)
 291                 return ret;
 292
 293         *accumulated_current = current_raw * (DS2781_CHARGE_UNITS / sense_res);
 294         return 0;
 295 }
 296
 297 static int ds2781_get_capacity(struct ds2781_device_info *dev_info,
 298         int *capacity)
 299 {
 300         int ret;
 301         u8 raw;
 302
 303         ret = ds2781_read8(dev_info, &raw, DS2781_RARC);
 304         if (ret < 0)
 305                 return ret;
 306
 307         *capacity = raw;
 308         return 0;
 309 }
 310
 311 static int ds2781_get_status(struct ds2781_device_info *dev_info, int *status)
 312 {
 313         int ret, current_uA, capacity;
 314
 315         ret = ds2781_get_current(dev_info, CURRENT_NOW, &current_uA);
 316         if (ret < 0)
 317                 return ret;
 318
 319         ret = ds2781_get_capacity(dev_info, &capacity);
 320         if (ret < 0)
 321                 return ret;
 322
 323         if (power_supply_am_i_supplied(dev_info->bat)) {
 324                 if (capacity == 100)
 325                         *status = POWER_SUPPLY_STATUS_FULL;
 326                 else if (current_uA > 50000)
 327                         *status = POWER_SUPPLY_STATUS_CHARGING;
 328                 else
 329                         *status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 330         } else {
 331                 *status = POWER_SUPPLY_STATUS_DISCHARGING;
 332         }
 333         return 0;
 334 }
 335
 336 static int ds2781_get_charge_now(struct ds2781_device_info *dev_info,
 337         int *charge_now)
 338 {
 339         int ret;
 340         u16 charge_raw;
 341
 342         /*
 343          * The RAAC value is located in 16 bits across the RAAC MSB and
 344          * LSB registers
 345          * Bits 15 - 8 of the RAAC value are in bits 7 - 0 of the RAAC
 346          * MSB register
 347          * Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC
 348          * LSB register
 349          */
 350         ret = ds2781_read16(dev_info, &charge_raw, DS2781_RAAC_MSB);
 351         if (ret < 0)
 352                 return ret;
 353
 354         *charge_now = charge_raw * 1600;
 355         return 0;
 356 }
 357
 358 static int ds2781_get_control_register(struct ds2781_device_info *dev_info,
 359         u8 *control_reg)
 360 {
 361         return ds2781_read8(dev_info, control_reg, DS2781_CONTROL);
 362 }
 363
 364 static int ds2781_set_control_register(struct ds2781_device_info *dev_info,
 365         u8 control_reg)
 366 {
 367         int ret;
 368
 369         ret = ds2781_write(dev_info, &control_reg,
 370                                 DS2781_CONTROL, sizeof(u8));
 371         if (ret < 0)
 372                 return ret;
 373
 374         return ds2781_save_eeprom(dev_info, DS2781_CONTROL);
 375 }
 376
 377 static int ds2781_battery_get_property(struct power_supply *psy,
 378         enum power_supply_property psp,
 379         union power_supply_propval *val)
 380 {
 381         int ret = 0;
 382         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 383
 384         switch (psp) {
 385         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 386                 ret = ds2781_get_voltage(dev_info, &val->intval);
 387                 break;
 388
 389         case POWER_SUPPLY_PROP_TEMP:
 390                 ret = ds2781_get_temperature(dev_info, &val->intval);
 391                 break;
 392
 393         case POWER_SUPPLY_PROP_MODEL_NAME:
 394                 val->strval = model;
 395                 break;
 396
 397         case POWER_SUPPLY_PROP_MANUFACTURER:
 398                 val->strval = manufacturer;
 399                 break;
 400
 401         case POWER_SUPPLY_PROP_CURRENT_NOW:
 402                 ret = ds2781_get_current(dev_info, CURRENT_NOW, &val->intval);
 403                 break;
 404
 405         case POWER_SUPPLY_PROP_CURRENT_AVG:
 406                 ret = ds2781_get_current(dev_info, CURRENT_AVG, &val->intval);
 407                 break;
 408
 409         case POWER_SUPPLY_PROP_STATUS:
 410                 ret = ds2781_get_status(dev_info, &val->intval);
 411                 break;
 412
 413         case POWER_SUPPLY_PROP_CAPACITY:
 414                 ret = ds2781_get_capacity(dev_info, &val->intval);
 415                 break;
 416
 417         case POWER_SUPPLY_PROP_CHARGE_COUNTER:
 418                 ret = ds2781_get_accumulated_current(dev_info, &val->intval);
 419                 break;
 420
 421         case POWER_SUPPLY_PROP_CHARGE_NOW:
 422                 ret = ds2781_get_charge_now(dev_info, &val->intval);
 423                 break;
 424
 425         default:
 426                 ret = -EINVAL;
 427         }
 428
 429         return ret;
 430 }
 431
 432 static enum power_supply_property ds2781_battery_props[] = {
 433         POWER_SUPPLY_PROP_STATUS,
 434         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 435         POWER_SUPPLY_PROP_TEMP,
 436         POWER_SUPPLY_PROP_MODEL_NAME,
 437         POWER_SUPPLY_PROP_MANUFACTURER,
 438         POWER_SUPPLY_PROP_CURRENT_NOW,
 439         POWER_SUPPLY_PROP_CURRENT_AVG,
 440         POWER_SUPPLY_PROP_CAPACITY,
 441         POWER_SUPPLY_PROP_CHARGE_COUNTER,
 442         POWER_SUPPLY_PROP_CHARGE_NOW,
 443 };
 444
 445 static ssize_t ds2781_get_pmod_enabled(struct device *dev,
 446         struct device_attribute *attr,
 447         char *buf)
 448 {
 449         int ret;
 450         u8 control_reg;
 451         struct power_supply *psy = to_power_supply(dev);
 452         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 453
 454         /* Get power mode */
 455         ret = ds2781_get_control_register(dev_info, &control_reg);
 456         if (ret < 0)
 457                 return ret;
 458
 459         return sprintf(buf, "%d\n",
 460                  !!(control_reg & DS2781_CONTROL_PMOD));
 461 }
 462
 463 static ssize_t ds2781_set_pmod_enabled(struct device *dev,
 464         struct device_attribute *attr,
 465         const char *buf,
 466         size_t count)
 467 {
 468         int ret;
 469         u8 control_reg, new_setting;
 470         struct power_supply *psy = to_power_supply(dev);
 471         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 472
 473         /* Set power mode */
 474         ret = ds2781_get_control_register(dev_info, &control_reg);
 475         if (ret < 0)
 476                 return ret;
 477
 478         ret = kstrtou8(buf, 0, &new_setting);
 479         if (ret < 0)
 480                 return ret;
 481
 482         if ((new_setting != 0) && (new_setting != 1)) {
 483                 dev_err(dev_info->dev, "Invalid pmod setting (0 or 1)\n");
 484                 return -EINVAL;
 485         }
 486
 487         if (new_setting)
 488                 control_reg |= DS2781_CONTROL_PMOD;
 489         else
 490                 control_reg &= ~DS2781_CONTROL_PMOD;
 491
 492         ret = ds2781_set_control_register(dev_info, control_reg);
 493         if (ret < 0)
 494                 return ret;
 495
 496         return count;
 497 }
 498
 499 static ssize_t ds2781_get_sense_resistor_value(struct device *dev,
 500         struct device_attribute *attr,
 501         char *buf)
 502 {
 503         int ret;
 504         u8 sense_resistor;
 505         struct power_supply *psy = to_power_supply(dev);
 506         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 507
 508         ret = ds2781_read8(dev_info, &sense_resistor, DS2781_RSNSP);
 509         if (ret < 0)
 510                 return ret;
 511
 512         ret = sprintf(buf, "%d\n", sense_resistor);
 513         return ret;
 514 }
 515
 516 static ssize_t ds2781_set_sense_resistor_value(struct device *dev,
 517         struct device_attribute *attr,
 518         const char *buf,
 519         size_t count)
 520 {
 521         int ret;
 522         u8 new_setting;
 523         struct power_supply *psy = to_power_supply(dev);
 524         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 525
 526         ret = kstrtou8(buf, 0, &new_setting);
 527         if (ret < 0)
 528                 return ret;
 529
 530         ret = ds2781_set_sense_register(dev_info, new_setting);
 531         if (ret < 0)
 532                 return ret;
 533
 534         return count;
 535 }
 536
 537 static ssize_t ds2781_get_rsgain_setting(struct device *dev,
 538         struct device_attribute *attr,
 539         char *buf)
 540 {
 541         int ret;
 542         u16 rsgain;
 543         struct power_supply *psy = to_power_supply(dev);
 544         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 545
 546         ret = ds2781_get_rsgain_register(dev_info, &rsgain);
 547         if (ret < 0)
 548                 return ret;
 549
 550         return sprintf(buf, "%d\n", rsgain);
 551 }
 552
 553 static ssize_t ds2781_set_rsgain_setting(struct device *dev,
 554         struct device_attribute *attr,
 555         const char *buf,
 556         size_t count)
 557 {
 558         int ret;
 559         u16 new_setting;
 560         struct power_supply *psy = to_power_supply(dev);
 561         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 562
 563         ret = kstrtou16(buf, 0, &new_setting);
 564         if (ret < 0)
 565                 return ret;
 566
 567         /* Gain can only be from 0 to 1.999 in steps of .001 */
 568         if (new_setting > 1999) {
 569                 dev_err(dev_info->dev, "Invalid rsgain setting (0 - 1999)\n");
 570                 return -EINVAL;
 571         }
 572
 573         ret = ds2781_set_rsgain_register(dev_info, new_setting);
 574         if (ret < 0)
 575                 return ret;
 576
 577         return count;
 578 }
 579
 580 static ssize_t ds2781_get_pio_pin(struct device *dev,
 581         struct device_attribute *attr,
 582         char *buf)
 583 {
 584         int ret;
 585         u8 sfr;
 586         struct power_supply *psy = to_power_supply(dev);
 587         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 588
 589         ret = ds2781_read8(dev_info, &sfr, DS2781_SFR);
 590         if (ret < 0)
 591                 return ret;
 592
 593         ret = sprintf(buf, "%d\n", sfr & DS2781_SFR_PIOSC);
 594         return ret;
 595 }
 596
 597 static ssize_t ds2781_set_pio_pin(struct device *dev,
 598         struct device_attribute *attr,
 599         const char *buf,
 600         size_t count)
 601 {
 602         int ret;
 603         u8 new_setting;
 604         struct power_supply *psy = to_power_supply(dev);
 605         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 606
 607         ret = kstrtou8(buf, 0, &new_setting);
 608         if (ret < 0)
 609                 return ret;
 610
 611         if ((new_setting != 0) && (new_setting != 1)) {
 612                 dev_err(dev_info->dev, "Invalid pio_pin setting (0 or 1)\n");
 613                 return -EINVAL;
 614         }
 615
 616         ret = ds2781_write(dev_info, &new_setting,
 617                                 DS2781_SFR, sizeof(u8));
 618         if (ret < 0)
 619                 return ret;
 620
 621         return count;
 622 }
 623
 624 static ssize_t ds2781_read_param_eeprom_bin(struct file *filp,
 625                                 struct kobject *kobj,
 626                                 struct bin_attribute *bin_attr,
 627                                 char *buf, loff_t off, size_t count)
 628 {
 629         struct device *dev = container_of(kobj, struct device, kobj);
 630         struct power_supply *psy = to_power_supply(dev);
 631         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 632
 633         return ds2781_read_block(dev_info, buf,
 634                                 DS2781_EEPROM_BLOCK1_START + off, count);
 635 }
 636
 637 static ssize_t ds2781_write_param_eeprom_bin(struct file *filp,
 638                                 struct kobject *kobj,
 639                                 struct bin_attribute *bin_attr,
 640                                 char *buf, loff_t off, size_t count)
 641 {
 642         struct device *dev = container_of(kobj, struct device, kobj);
 643         struct power_supply *psy = to_power_supply(dev);
 644         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 645         int ret;
 646
 647         ret = ds2781_write(dev_info, buf,
 648                                 DS2781_EEPROM_BLOCK1_START + off, count);
 649         if (ret < 0)
 650                 return ret;
 651
 652         ret = ds2781_save_eeprom(dev_info, DS2781_EEPROM_BLOCK1_START);
 653         if (ret < 0)
 654                 return ret;
 655
 656         return count;
 657 }
 658
 659 static struct bin_attribute ds2781_param_eeprom_bin_attr = {
 660         .attr = {
 661                 .name = "param_eeprom",
 662                 .mode = S_IRUGO | S_IWUSR,
 663         },
 664         .size = DS2781_PARAM_EEPROM_SIZE,
 665         .read = ds2781_read_param_eeprom_bin,
 666         .write = ds2781_write_param_eeprom_bin,
 667 };
 668
 669 static ssize_t ds2781_read_user_eeprom_bin(struct file *filp,
 670                                 struct kobject *kobj,
 671                                 struct bin_attribute *bin_attr,
 672                                 char *buf, loff_t off, size_t count)
 673 {
 674         struct device *dev = container_of(kobj, struct device, kobj);
 675         struct power_supply *psy = to_power_supply(dev);
 676         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 677
 678         return ds2781_read_block(dev_info, buf,
 679                                 DS2781_EEPROM_BLOCK0_START + off, count);
 680
 681 }
 682
 683 static ssize_t ds2781_write_user_eeprom_bin(struct file *filp,
 684                                 struct kobject *kobj,
 685                                 struct bin_attribute *bin_attr,
 686                                 char *buf, loff_t off, size_t count)
 687 {
 688         struct device *dev = container_of(kobj, struct device, kobj);
 689         struct power_supply *psy = to_power_supply(dev);
 690         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 691         int ret;
 692
 693         ret = ds2781_write(dev_info, buf,
 694                                 DS2781_EEPROM_BLOCK0_START + off, count);
 695         if (ret < 0)
 696                 return ret;
 697
 698         ret = ds2781_save_eeprom(dev_info, DS2781_EEPROM_BLOCK0_START);
 699         if (ret < 0)
 700                 return ret;
 701
 702         return count;
 703 }
 704
 705 static struct bin_attribute ds2781_user_eeprom_bin_attr = {
 706         .attr = {
 707                 .name = "user_eeprom",
 708                 .mode = S_IRUGO | S_IWUSR,
 709         },
 710         .size = DS2781_USER_EEPROM_SIZE,
 711         .read = ds2781_read_user_eeprom_bin,
 712         .write = ds2781_write_user_eeprom_bin,
 713 };
 714
 715 static DEVICE_ATTR(pmod_enabled, S_IRUGO | S_IWUSR, ds2781_get_pmod_enabled,
 716         ds2781_set_pmod_enabled);
 717 static DEVICE_ATTR(sense_resistor_value, S_IRUGO | S_IWUSR,
 718         ds2781_get_sense_resistor_value, ds2781_set_sense_resistor_value);
 719 static DEVICE_ATTR(rsgain_setting, S_IRUGO | S_IWUSR, ds2781_get_rsgain_setting,
 720         ds2781_set_rsgain_setting);
 721 static DEVICE_ATTR(pio_pin, S_IRUGO | S_IWUSR, ds2781_get_pio_pin,
 722         ds2781_set_pio_pin);
 723
 724 static struct attribute *ds2781_sysfs_attrs[] = {
 725         &dev_attr_pmod_enabled.attr,
 726         &dev_attr_sense_resistor_value.attr,
 727         &dev_attr_rsgain_setting.attr,
 728         &dev_attr_pio_pin.attr,
 729         NULL
 730 };
 731
 732 static struct bin_attribute *ds2781_sysfs_bin_attrs[] = {
 733         &ds2781_param_eeprom_bin_attr,
 734         &ds2781_user_eeprom_bin_attr,
 735         NULL,
 736 };
 737
 738 static const struct attribute_group ds2781_sysfs_group = {
 739         .attrs = ds2781_sysfs_attrs,
 740         .bin_attrs = ds2781_sysfs_bin_attrs,
 741
 742 };
 743
 744 static const struct attribute_group *ds2781_sysfs_groups[] = {
 745         &ds2781_sysfs_group,
 746         NULL,
 747 };
 748
 749 static int ds2781_battery_probe(struct platform_device *pdev)
 750 {
 751         struct power_supply_config psy_cfg = {};
 752         struct ds2781_device_info *dev_info;
 753
 754         dev_info = devm_kzalloc(&pdev->dev, sizeof(*dev_info), GFP_KERNEL);
 755         if (!dev_info)
 756                 return -ENOMEM;
 757
 758         platform_set_drvdata(pdev, dev_info);
 759
 760         dev_info->dev                   = &pdev->dev;
 761         dev_info->w1_dev                = pdev->dev.parent;
 762         dev_info->bat_desc.name         = dev_name(&pdev->dev);
 763         dev_info->bat_desc.type         = POWER_SUPPLY_TYPE_BATTERY;
 764         dev_info->bat_desc.properties   = ds2781_battery_props;
 765         dev_info->bat_desc.num_properties = ARRAY_SIZE(ds2781_battery_props);
 766         dev_info->bat_desc.get_property = ds2781_battery_get_property;
 767
 768         psy_cfg.drv_data                = dev_info;
 769         psy_cfg.attr_grp                = ds2781_sysfs_groups;
 770
 771         dev_info->bat = devm_power_supply_register(&pdev->dev,
 772                                                    &dev_info->bat_desc,
 773                                                    &psy_cfg);
 774         if (IS_ERR(dev_info->bat)) {
 775                 dev_err(dev_info->dev, "failed to register battery\n");
 776                 return PTR_ERR(dev_info->bat);
 777         }
 778
 779         return 0;
 780 }
 781
 782 static struct platform_driver ds2781_battery_driver = {
 783         .driver = {
 784                 .name = "ds2781-battery",
 785         },
 786         .probe    = ds2781_battery_probe,
 787 };
 788 module_platform_driver(ds2781_battery_driver);
 789
 790 MODULE_LICENSE("GPL");
 791 MODULE_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>");
 792 MODULE_DESCRIPTION("Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC driver");
 793 MODULE_ALIAS("platform:ds2781-battery");
 794