drivers/power/supply/ds2780_battery.c

   1 /*
   2  * 1-wire client/driver for the Maxim/Dallas DS2780 Stand-Alone Fuel Gauge IC
   3  *
   4  * Copyright (C) 2010 Indesign, LLC
   5  *
   6  * Author: Clifton Barnes <cabarnes@indesign-llc.com>
   7  *
   8  * Based on ds2760_battery and ds2782_battery drivers
   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 version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/slab.h>
  18 #include <linux/param.h>
  19 #include <linux/pm.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/power_supply.h>
  22 #include <linux/idr.h>
  23
  24 #include <linux/w1.h>
  25 #include "../../w1/slaves/w1_ds2780.h"
  26
  27 /* Current unit measurement in uA for a 1 milli-ohm sense resistor */
  28 #define DS2780_CURRENT_UNITS    1563
  29 /* Charge unit measurement in uAh for a 1 milli-ohm sense resistor */
  30 #define DS2780_CHARGE_UNITS             6250
  31 /* Number of bytes in user EEPROM space */
  32 #define DS2780_USER_EEPROM_SIZE         (DS2780_EEPROM_BLOCK0_END - \
  33                                         DS2780_EEPROM_BLOCK0_START + 1)
  34 /* Number of bytes in parameter EEPROM space */
  35 #define DS2780_PARAM_EEPROM_SIZE        (DS2780_EEPROM_BLOCK1_END - \
  36                                         DS2780_EEPROM_BLOCK1_START + 1)
  37
  38 struct ds2780_device_info {
  39         struct device *dev;
  40         struct power_supply *bat;
  41         struct power_supply_desc bat_desc;
  42         struct device *w1_dev;
  43 };
  44
  45 enum current_types {
  46         CURRENT_NOW,
  47         CURRENT_AVG,
  48 };
  49
  50 static const char model[] = "DS2780";
  51 static const char manufacturer[] = "Maxim/Dallas";
  52
  53 static inline struct ds2780_device_info *
  54 to_ds2780_device_info(struct power_supply *psy)
  55 {
  56         return power_supply_get_drvdata(psy);
  57 }
  58
  59 static inline int ds2780_battery_io(struct ds2780_device_info *dev_info,
  60         char *buf, int addr, size_t count, int io)
  61 {
  62         return w1_ds2780_io(dev_info->w1_dev, buf, addr, count, io);
  63 }
  64
  65 static inline int ds2780_read8(struct ds2780_device_info *dev_info, u8 *val,
  66         int addr)
  67 {
  68         return ds2780_battery_io(dev_info, val, addr, sizeof(u8), 0);
  69 }
  70
  71 static int ds2780_read16(struct ds2780_device_info *dev_info, s16 *val,
  72         int addr)
  73 {
  74         int ret;
  75         u8 raw[2];
  76
  77         ret = ds2780_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 ds2780_read_block(struct ds2780_device_info *dev_info,
  87         u8 *val, int addr, size_t count)
  88 {
  89         return ds2780_battery_io(dev_info, val, addr, count, 0);
  90 }
  91
  92 static inline int ds2780_write(struct ds2780_device_info *dev_info, u8 *val,
  93         int addr, size_t count)
  94 {
  95         return ds2780_battery_io(dev_info, val, addr, count, 1);
  96 }
  97
  98 static inline int ds2780_store_eeprom(struct device *dev, int addr)
  99 {
 100         return w1_ds2780_eeprom_cmd(dev, addr, W1_DS2780_COPY_DATA);
 101 }
 102
 103 static inline int ds2780_recall_eeprom(struct device *dev, int addr)
 104 {
 105         return w1_ds2780_eeprom_cmd(dev, addr, W1_DS2780_RECALL_DATA);
 106 }
 107
 108 static int ds2780_save_eeprom(struct ds2780_device_info *dev_info, int reg)
 109 {
 110         int ret;
 111
 112         ret = ds2780_store_eeprom(dev_info->w1_dev, reg);
 113         if (ret < 0)
 114                 return ret;
 115
 116         ret = ds2780_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 ds2780_set_sense_register(struct ds2780_device_info *dev_info,
 125         u8 conductance)
 126 {
 127         int ret;
 128
 129         ret = ds2780_write(dev_info, &conductance,
 130                                 DS2780_RSNSP_REG, sizeof(u8));
 131         if (ret < 0)
 132                 return ret;
 133
 134         return ds2780_save_eeprom(dev_info, DS2780_RSNSP_REG);
 135 }
 136
 137 /* Get RSGAIN value from 0 to 1.999 in steps of 0.001 */
 138 static int ds2780_get_rsgain_register(struct ds2780_device_info *dev_info,
 139         u16 *rsgain)
 140 {
 141         return ds2780_read16(dev_info, rsgain, DS2780_RSGAIN_MSB_REG);
 142 }
 143
 144 /* Set RSGAIN value from 0 to 1.999 in steps of 0.001 */
 145 static int ds2780_set_rsgain_register(struct ds2780_device_info *dev_info,
 146         u16 rsgain)
 147 {
 148         int ret;
 149         u8 raw[] = {rsgain >> 8, rsgain & 0xFF};
 150
 151         ret = ds2780_write(dev_info, raw,
 152                                 DS2780_RSGAIN_MSB_REG, sizeof(raw));
 153         if (ret < 0)
 154                 return ret;
 155
 156         return ds2780_save_eeprom(dev_info, DS2780_RSGAIN_MSB_REG);
 157 }
 158
 159 static int ds2780_get_voltage(struct ds2780_device_info *dev_info,
 160         int *voltage_uV)
 161 {
 162         int ret;
 163         s16 voltage_raw;
 164
 165         /*
 166          * The voltage value is located in 10 bits across the voltage MSB
 167          * and LSB registers in two's compliment form
 168          * Sign bit of the voltage value is in bit 7 of the voltage MSB register
 169          * Bits 9 - 3 of the voltage value are in bits 6 - 0 of the
 170          * voltage MSB register
 171          * Bits 2 - 0 of the voltage value are in bits 7 - 5 of the
 172          * voltage LSB register
 173          */
 174         ret = ds2780_read16(dev_info, &voltage_raw,
 175                                 DS2780_VOLT_MSB_REG);
 176         if (ret < 0)
 177                 return ret;
 178
 179         /*
 180          * DS2780 reports voltage in units of 4.88mV, but the battery class
 181          * reports in units of uV, so convert by multiplying by 4880.
 182          */
 183         *voltage_uV = (voltage_raw / 32) * 4880;
 184         return 0;
 185 }
 186
 187 static int ds2780_get_temperature(struct ds2780_device_info *dev_info,
 188         int *temperature)
 189 {
 190         int ret;
 191         s16 temperature_raw;
 192
 193         /*
 194          * The temperature value is located in 10 bits across the temperature
 195          * MSB and LSB registers in two's compliment form
 196          * Sign bit of the temperature value is in bit 7 of the temperature
 197          * MSB register
 198          * Bits 9 - 3 of the temperature value are in bits 6 - 0 of the
 199          * temperature MSB register
 200          * Bits 2 - 0 of the temperature value are in bits 7 - 5 of the
 201          * temperature LSB register
 202          */
 203         ret = ds2780_read16(dev_info, &temperature_raw,
 204                                 DS2780_TEMP_MSB_REG);
 205         if (ret < 0)
 206                 return ret;
 207
 208         /*
 209          * Temperature is measured in units of 0.125 degrees celcius, the
 210          * power_supply class measures temperature in tenths of degrees
 211          * celsius. The temperature value is stored as a 10 bit number, plus
 212          * sign in the upper bits of a 16 bit register.
 213          */
 214         *temperature = ((temperature_raw / 32) * 125) / 100;
 215         return 0;
 216 }
 217
 218 static int ds2780_get_current(struct ds2780_device_info *dev_info,
 219         enum current_types type, int *current_uA)
 220 {
 221         int ret, sense_res;
 222         s16 current_raw;
 223         u8 sense_res_raw, reg_msb;
 224
 225         /*
 226          * The units of measurement for current are dependent on the value of
 227          * the sense resistor.
 228          */
 229         ret = ds2780_read8(dev_info, &sense_res_raw, DS2780_RSNSP_REG);
 230         if (ret < 0)
 231                 return ret;
 232
 233         if (sense_res_raw == 0) {
 234                 dev_err(dev_info->dev, "sense resistor value is 0\n");
 235                 return -EINVAL;
 236         }
 237         sense_res = 1000 / sense_res_raw;
 238
 239         if (type == CURRENT_NOW)
 240                 reg_msb = DS2780_CURRENT_MSB_REG;
 241         else if (type == CURRENT_AVG)
 242                 reg_msb = DS2780_IAVG_MSB_REG;
 243         else
 244                 return -EINVAL;
 245
 246         /*
 247          * The current value is located in 16 bits across the current MSB
 248          * and LSB registers in two's compliment form
 249          * Sign bit of the current value is in bit 7 of the current MSB register
 250          * Bits 14 - 8 of the current value are in bits 6 - 0 of the current
 251          * MSB register
 252          * Bits 7 - 0 of the current value are in bits 7 - 0 of the current
 253          * LSB register
 254          */
 255         ret = ds2780_read16(dev_info, &current_raw, reg_msb);
 256         if (ret < 0)
 257                 return ret;
 258
 259         *current_uA = current_raw * (DS2780_CURRENT_UNITS / sense_res);
 260         return 0;
 261 }
 262
 263 static int ds2780_get_accumulated_current(struct ds2780_device_info *dev_info,
 264         int *accumulated_current)
 265 {
 266         int ret, sense_res;
 267         s16 current_raw;
 268         u8 sense_res_raw;
 269
 270         /*
 271          * The units of measurement for accumulated current are dependent on
 272          * the value of the sense resistor.
 273          */
 274         ret = ds2780_read8(dev_info, &sense_res_raw, DS2780_RSNSP_REG);
 275         if (ret < 0)
 276                 return ret;
 277
 278         if (sense_res_raw == 0) {
 279                 dev_err(dev_info->dev, "sense resistor value is 0\n");
 280                 return -ENXIO;
 281         }
 282         sense_res = 1000 / sense_res_raw;
 283
 284         /*
 285          * The ACR value is located in 16 bits across the ACR MSB and
 286          * LSB registers
 287          * Bits 15 - 8 of the ACR value are in bits 7 - 0 of the ACR
 288          * MSB register
 289          * Bits 7 - 0 of the ACR value are in bits 7 - 0 of the ACR
 290          * LSB register
 291          */
 292         ret = ds2780_read16(dev_info, &current_raw, DS2780_ACR_MSB_REG);
 293         if (ret < 0)
 294                 return ret;
 295
 296         *accumulated_current = current_raw * (DS2780_CHARGE_UNITS / sense_res);
 297         return 0;
 298 }
 299
 300 static int ds2780_get_capacity(struct ds2780_device_info *dev_info,
 301         int *capacity)
 302 {
 303         int ret;
 304         u8 raw;
 305
 306         ret = ds2780_read8(dev_info, &raw, DS2780_RARC_REG);
 307         if (ret < 0)
 308                 return ret;
 309
 310         *capacity = raw;
 311         return raw;
 312 }
 313
 314 static int ds2780_get_status(struct ds2780_device_info *dev_info, int *status)
 315 {
 316         int ret, current_uA, capacity;
 317
 318         ret = ds2780_get_current(dev_info, CURRENT_NOW, &current_uA);
 319         if (ret < 0)
 320                 return ret;
 321
 322         ret = ds2780_get_capacity(dev_info, &capacity);
 323         if (ret < 0)
 324                 return ret;
 325
 326         if (capacity == 100)
 327                 *status = POWER_SUPPLY_STATUS_FULL;
 328         else if (current_uA == 0)
 329                 *status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 330         else if (current_uA < 0)
 331                 *status = POWER_SUPPLY_STATUS_DISCHARGING;
 332         else
 333                 *status = POWER_SUPPLY_STATUS_CHARGING;
 334
 335         return 0;
 336 }
 337
 338 static int ds2780_get_charge_now(struct ds2780_device_info *dev_info,
 339         int *charge_now)
 340 {
 341         int ret;
 342         u16 charge_raw;
 343
 344         /*
 345          * The RAAC value is located in 16 bits across the RAAC MSB and
 346          * LSB registers
 347          * Bits 15 - 8 of the RAAC value are in bits 7 - 0 of the RAAC
 348          * MSB register
 349          * Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC
 350          * LSB register
 351          */
 352         ret = ds2780_read16(dev_info, &charge_raw, DS2780_RAAC_MSB_REG);
 353         if (ret < 0)
 354                 return ret;
 355
 356         *charge_now = charge_raw * 1600;
 357         return 0;
 358 }
 359
 360 static int ds2780_get_control_register(struct ds2780_device_info *dev_info,
 361         u8 *control_reg)
 362 {
 363         return ds2780_read8(dev_info, control_reg, DS2780_CONTROL_REG);
 364 }
 365
 366 static int ds2780_set_control_register(struct ds2780_device_info *dev_info,
 367         u8 control_reg)
 368 {
 369         int ret;
 370
 371         ret = ds2780_write(dev_info, &control_reg,
 372                                 DS2780_CONTROL_REG, sizeof(u8));
 373         if (ret < 0)
 374                 return ret;
 375
 376         return ds2780_save_eeprom(dev_info, DS2780_CONTROL_REG);
 377 }
 378
 379 static int ds2780_battery_get_property(struct power_supply *psy,
 380         enum power_supply_property psp,
 381         union power_supply_propval *val)
 382 {
 383         int ret = 0;
 384         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 385
 386         switch (psp) {
 387         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 388                 ret = ds2780_get_voltage(dev_info, &val->intval);
 389                 break;
 390
 391         case POWER_SUPPLY_PROP_TEMP:
 392                 ret = ds2780_get_temperature(dev_info, &val->intval);
 393                 break;
 394
 395         case POWER_SUPPLY_PROP_MODEL_NAME:
 396                 val->strval = model;
 397                 break;
 398
 399         case POWER_SUPPLY_PROP_MANUFACTURER:
 400                 val->strval = manufacturer;
 401                 break;
 402
 403         case POWER_SUPPLY_PROP_CURRENT_NOW:
 404                 ret = ds2780_get_current(dev_info, CURRENT_NOW, &val->intval);
 405                 break;
 406
 407         case POWER_SUPPLY_PROP_CURRENT_AVG:
 408                 ret = ds2780_get_current(dev_info, CURRENT_AVG, &val->intval);
 409                 break;
 410
 411         case POWER_SUPPLY_PROP_STATUS:
 412                 ret = ds2780_get_status(dev_info, &val->intval);
 413                 break;
 414
 415         case POWER_SUPPLY_PROP_CAPACITY:
 416                 ret = ds2780_get_capacity(dev_info, &val->intval);
 417                 break;
 418
 419         case POWER_SUPPLY_PROP_CHARGE_COUNTER:
 420                 ret = ds2780_get_accumulated_current(dev_info, &val->intval);
 421                 break;
 422
 423         case POWER_SUPPLY_PROP_CHARGE_NOW:
 424                 ret = ds2780_get_charge_now(dev_info, &val->intval);
 425                 break;
 426
 427         default:
 428                 ret = -EINVAL;
 429         }
 430
 431         return ret;
 432 }
 433
 434 static enum power_supply_property ds2780_battery_props[] = {
 435         POWER_SUPPLY_PROP_STATUS,
 436         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 437         POWER_SUPPLY_PROP_TEMP,
 438         POWER_SUPPLY_PROP_MODEL_NAME,
 439         POWER_SUPPLY_PROP_MANUFACTURER,
 440         POWER_SUPPLY_PROP_CURRENT_NOW,
 441         POWER_SUPPLY_PROP_CURRENT_AVG,
 442         POWER_SUPPLY_PROP_CAPACITY,
 443         POWER_SUPPLY_PROP_CHARGE_COUNTER,
 444         POWER_SUPPLY_PROP_CHARGE_NOW,
 445 };
 446
 447 static ssize_t ds2780_get_pmod_enabled(struct device *dev,
 448         struct device_attribute *attr,
 449         char *buf)
 450 {
 451         int ret;
 452         u8 control_reg;
 453         struct power_supply *psy = to_power_supply(dev);
 454         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 455
 456         /* Get power mode */
 457         ret = ds2780_get_control_register(dev_info, &control_reg);
 458         if (ret < 0)
 459                 return ret;
 460
 461         return sprintf(buf, "%d\n",
 462                  !!(control_reg & DS2780_CONTROL_REG_PMOD));
 463 }
 464
 465 static ssize_t ds2780_set_pmod_enabled(struct device *dev,
 466         struct device_attribute *attr,
 467         const char *buf,
 468         size_t count)
 469 {
 470         int ret;
 471         u8 control_reg, new_setting;
 472         struct power_supply *psy = to_power_supply(dev);
 473         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 474
 475         /* Set power mode */
 476         ret = ds2780_get_control_register(dev_info, &control_reg);
 477         if (ret < 0)
 478                 return ret;
 479
 480         ret = kstrtou8(buf, 0, &new_setting);
 481         if (ret < 0)
 482                 return ret;
 483
 484         if ((new_setting != 0) && (new_setting != 1)) {
 485                 dev_err(dev_info->dev, "Invalid pmod setting (0 or 1)\n");
 486                 return -EINVAL;
 487         }
 488
 489         if (new_setting)
 490                 control_reg |= DS2780_CONTROL_REG_PMOD;
 491         else
 492                 control_reg &= ~DS2780_CONTROL_REG_PMOD;
 493
 494         ret = ds2780_set_control_register(dev_info, control_reg);
 495         if (ret < 0)
 496                 return ret;
 497
 498         return count;
 499 }
 500
 501 static ssize_t ds2780_get_sense_resistor_value(struct device *dev,
 502         struct device_attribute *attr,
 503         char *buf)
 504 {
 505         int ret;
 506         u8 sense_resistor;
 507         struct power_supply *psy = to_power_supply(dev);
 508         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 509
 510         ret = ds2780_read8(dev_info, &sense_resistor, DS2780_RSNSP_REG);
 511         if (ret < 0)
 512                 return ret;
 513
 514         ret = sprintf(buf, "%d\n", sense_resistor);
 515         return ret;
 516 }
 517
 518 static ssize_t ds2780_set_sense_resistor_value(struct device *dev,
 519         struct device_attribute *attr,
 520         const char *buf,
 521         size_t count)
 522 {
 523         int ret;
 524         u8 new_setting;
 525         struct power_supply *psy = to_power_supply(dev);
 526         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 527
 528         ret = kstrtou8(buf, 0, &new_setting);
 529         if (ret < 0)
 530                 return ret;
 531
 532         ret = ds2780_set_sense_register(dev_info, new_setting);
 533         if (ret < 0)
 534                 return ret;
 535
 536         return count;
 537 }
 538
 539 static ssize_t ds2780_get_rsgain_setting(struct device *dev,
 540         struct device_attribute *attr,
 541         char *buf)
 542 {
 543         int ret;
 544         u16 rsgain;
 545         struct power_supply *psy = to_power_supply(dev);
 546         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 547
 548         ret = ds2780_get_rsgain_register(dev_info, &rsgain);
 549         if (ret < 0)
 550                 return ret;
 551
 552         return sprintf(buf, "%d\n", rsgain);
 553 }
 554
 555 static ssize_t ds2780_set_rsgain_setting(struct device *dev,
 556         struct device_attribute *attr,
 557         const char *buf,
 558         size_t count)
 559 {
 560         int ret;
 561         u16 new_setting;
 562         struct power_supply *psy = to_power_supply(dev);
 563         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 564
 565         ret = kstrtou16(buf, 0, &new_setting);
 566         if (ret < 0)
 567                 return ret;
 568
 569         /* Gain can only be from 0 to 1.999 in steps of .001 */
 570         if (new_setting > 1999) {
 571                 dev_err(dev_info->dev, "Invalid rsgain setting (0 - 1999)\n");
 572                 return -EINVAL;
 573         }
 574
 575         ret = ds2780_set_rsgain_register(dev_info, new_setting);
 576         if (ret < 0)
 577                 return ret;
 578
 579         return count;
 580 }
 581
 582 static ssize_t ds2780_get_pio_pin(struct device *dev,
 583         struct device_attribute *attr,
 584         char *buf)
 585 {
 586         int ret;
 587         u8 sfr;
 588         struct power_supply *psy = to_power_supply(dev);
 589         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 590
 591         ret = ds2780_read8(dev_info, &sfr, DS2780_SFR_REG);
 592         if (ret < 0)
 593                 return ret;
 594
 595         ret = sprintf(buf, "%d\n", sfr & DS2780_SFR_REG_PIOSC);
 596         return ret;
 597 }
 598
 599 static ssize_t ds2780_set_pio_pin(struct device *dev,
 600         struct device_attribute *attr,
 601         const char *buf,
 602         size_t count)
 603 {
 604         int ret;
 605         u8 new_setting;
 606         struct power_supply *psy = to_power_supply(dev);
 607         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 608
 609         ret = kstrtou8(buf, 0, &new_setting);
 610         if (ret < 0)
 611                 return ret;
 612
 613         if ((new_setting != 0) && (new_setting != 1)) {
 614                 dev_err(dev_info->dev, "Invalid pio_pin setting (0 or 1)\n");
 615                 return -EINVAL;
 616         }
 617
 618         ret = ds2780_write(dev_info, &new_setting,
 619                                 DS2780_SFR_REG, sizeof(u8));
 620         if (ret < 0)
 621                 return ret;
 622
 623         return count;
 624 }
 625
 626 static ssize_t ds2780_read_param_eeprom_bin(struct file *filp,
 627                                 struct kobject *kobj,
 628                                 struct bin_attribute *bin_attr,
 629                                 char *buf, loff_t off, size_t count)
 630 {
 631         struct device *dev = container_of(kobj, struct device, kobj);
 632         struct power_supply *psy = to_power_supply(dev);
 633         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 634
 635         return ds2780_read_block(dev_info, buf,
 636                                 DS2780_EEPROM_BLOCK1_START + off, count);
 637 }
 638
 639 static ssize_t ds2780_write_param_eeprom_bin(struct file *filp,
 640                                 struct kobject *kobj,
 641                                 struct bin_attribute *bin_attr,
 642                                 char *buf, loff_t off, size_t count)
 643 {
 644         struct device *dev = container_of(kobj, struct device, kobj);
 645         struct power_supply *psy = to_power_supply(dev);
 646         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 647         int ret;
 648
 649         ret = ds2780_write(dev_info, buf,
 650                                 DS2780_EEPROM_BLOCK1_START + off, count);
 651         if (ret < 0)
 652                 return ret;
 653
 654         ret = ds2780_save_eeprom(dev_info, DS2780_EEPROM_BLOCK1_START);
 655         if (ret < 0)
 656                 return ret;
 657
 658         return count;
 659 }
 660
 661 static const struct bin_attribute ds2780_param_eeprom_bin_attr = {
 662         .attr = {
 663                 .name = "param_eeprom",
 664                 .mode = S_IRUGO | S_IWUSR,
 665         },
 666         .size = DS2780_PARAM_EEPROM_SIZE,
 667         .read = ds2780_read_param_eeprom_bin,
 668         .write = ds2780_write_param_eeprom_bin,
 669 };
 670
 671 static ssize_t ds2780_read_user_eeprom_bin(struct file *filp,
 672                                 struct kobject *kobj,
 673                                 struct bin_attribute *bin_attr,
 674                                 char *buf, loff_t off, size_t count)
 675 {
 676         struct device *dev = container_of(kobj, struct device, kobj);
 677         struct power_supply *psy = to_power_supply(dev);
 678         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 679
 680         return ds2780_read_block(dev_info, buf,
 681                                 DS2780_EEPROM_BLOCK0_START + off, count);
 682 }
 683
 684 static ssize_t ds2780_write_user_eeprom_bin(struct file *filp,
 685                                 struct kobject *kobj,
 686                                 struct bin_attribute *bin_attr,
 687                                 char *buf, loff_t off, size_t count)
 688 {
 689         struct device *dev = container_of(kobj, struct device, kobj);
 690         struct power_supply *psy = to_power_supply(dev);
 691         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 692         int ret;
 693
 694         ret = ds2780_write(dev_info, buf,
 695                                 DS2780_EEPROM_BLOCK0_START + off, count);
 696         if (ret < 0)
 697                 return ret;
 698
 699         ret = ds2780_save_eeprom(dev_info, DS2780_EEPROM_BLOCK0_START);
 700         if (ret < 0)
 701                 return ret;
 702
 703         return count;
 704 }
 705
 706 static const struct bin_attribute ds2780_user_eeprom_bin_attr = {
 707         .attr = {
 708                 .name = "user_eeprom",
 709                 .mode = S_IRUGO | S_IWUSR,
 710         },
 711         .size = DS2780_USER_EEPROM_SIZE,
 712         .read = ds2780_read_user_eeprom_bin,
 713         .write = ds2780_write_user_eeprom_bin,
 714 };
 715
 716 static DEVICE_ATTR(pmod_enabled, S_IRUGO | S_IWUSR, ds2780_get_pmod_enabled,
 717         ds2780_set_pmod_enabled);
 718 static DEVICE_ATTR(sense_resistor_value, S_IRUGO | S_IWUSR,
 719         ds2780_get_sense_resistor_value, ds2780_set_sense_resistor_value);
 720 static DEVICE_ATTR(rsgain_setting, S_IRUGO | S_IWUSR, ds2780_get_rsgain_setting,
 721         ds2780_set_rsgain_setting);
 722 static DEVICE_ATTR(pio_pin, S_IRUGO | S_IWUSR, ds2780_get_pio_pin,
 723         ds2780_set_pio_pin);
 724
 725
 726 static struct attribute *ds2780_attributes[] = {
 727         &dev_attr_pmod_enabled.attr,
 728         &dev_attr_sense_resistor_value.attr,
 729         &dev_attr_rsgain_setting.attr,
 730         &dev_attr_pio_pin.attr,
 731         NULL
 732 };
 733
 734 static const struct attribute_group ds2780_attr_group = {
 735         .attrs = ds2780_attributes,
 736 };
 737
 738 static int ds2780_battery_probe(struct platform_device *pdev)
 739 {
 740         struct power_supply_config psy_cfg = {};
 741         int ret = 0;
 742         struct ds2780_device_info *dev_info;
 743
 744         dev_info = devm_kzalloc(&pdev->dev, sizeof(*dev_info), GFP_KERNEL);
 745         if (!dev_info) {
 746                 ret = -ENOMEM;
 747                 goto fail;
 748         }
 749
 750         platform_set_drvdata(pdev, dev_info);
 751
 752         dev_info->dev                   = &pdev->dev;
 753         dev_info->w1_dev                = pdev->dev.parent;
 754         dev_info->bat_desc.name         = dev_name(&pdev->dev);
 755         dev_info->bat_desc.type         = POWER_SUPPLY_TYPE_BATTERY;
 756         dev_info->bat_desc.properties   = ds2780_battery_props;
 757         dev_info->bat_desc.num_properties = ARRAY_SIZE(ds2780_battery_props);
 758         dev_info->bat_desc.get_property = ds2780_battery_get_property;
 759
 760         psy_cfg.drv_data                = dev_info;
 761
 762         dev_info->bat = power_supply_register(&pdev->dev, &dev_info->bat_desc,
 763                                               &psy_cfg);
 764         if (IS_ERR(dev_info->bat)) {
 765                 dev_err(dev_info->dev, "failed to register battery\n");
 766                 ret = PTR_ERR(dev_info->bat);
 767                 goto fail;
 768         }
 769
 770         ret = sysfs_create_group(&dev_info->bat->dev.kobj, &ds2780_attr_group);
 771         if (ret) {
 772                 dev_err(dev_info->dev, "failed to create sysfs group\n");
 773                 goto fail_unregister;
 774         }
 775
 776         ret = sysfs_create_bin_file(&dev_info->bat->dev.kobj,
 777                                         &ds2780_param_eeprom_bin_attr);
 778         if (ret) {
 779                 dev_err(dev_info->dev,
 780                                 "failed to create param eeprom bin file");
 781                 goto fail_remove_group;
 782         }
 783
 784         ret = sysfs_create_bin_file(&dev_info->bat->dev.kobj,
 785                                         &ds2780_user_eeprom_bin_attr);
 786         if (ret) {
 787                 dev_err(dev_info->dev,
 788                                 "failed to create user eeprom bin file");
 789                 goto fail_remove_bin_file;
 790         }
 791
 792         return 0;
 793
 794 fail_remove_bin_file:
 795         sysfs_remove_bin_file(&dev_info->bat->dev.kobj,
 796                                 &ds2780_param_eeprom_bin_attr);
 797 fail_remove_group:
 798         sysfs_remove_group(&dev_info->bat->dev.kobj, &ds2780_attr_group);
 799 fail_unregister:
 800         power_supply_unregister(dev_info->bat);
 801 fail:
 802         return ret;
 803 }
 804
 805 static int ds2780_battery_remove(struct platform_device *pdev)
 806 {
 807         struct ds2780_device_info *dev_info = platform_get_drvdata(pdev);
 808
 809         /*
 810          * Remove attributes before unregistering power supply
 811          * because 'bat' will be freed on power_supply_unregister() call.
 812          */
 813         sysfs_remove_group(&dev_info->bat->dev.kobj, &ds2780_attr_group);
 814
 815         power_supply_unregister(dev_info->bat);
 816
 817         return 0;
 818 }
 819
 820 static struct platform_driver ds2780_battery_driver = {
 821         .driver = {
 822                 .name = "ds2780-battery",
 823         },
 824         .probe    = ds2780_battery_probe,
 825         .remove   = ds2780_battery_remove,
 826 };
 827
 828 module_platform_driver(ds2780_battery_driver);
 829
 830 MODULE_LICENSE("GPL");
 831 MODULE_AUTHOR("Clifton Barnes <cabarnes@indesign-llc.com>");
 832 MODULE_DESCRIPTION("Maxim/Dallas DS2780 Stand-Alone Fuel Gauage IC driver");
 833 MODULE_ALIAS("platform:ds2780-battery");