drivers/power/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 "../w1/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 device *w1_dev;
  42         struct task_struct *mutex_holder;
  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 container_of(psy, struct ds2780_device_info, bat);
  57 }
  58
  59 static inline struct power_supply *to_power_supply(struct device *dev)
  60 {
  61         return dev_get_drvdata(dev);
  62 }
  63
  64 static inline int ds2780_battery_io(struct ds2780_device_info *dev_info,
  65         char *buf, int addr, size_t count, int io)
  66 {
  67         if (dev_info->mutex_holder == current)
  68                 return w1_ds2780_io_nolock(dev_info->w1_dev, buf, addr, count, io);
  69         else
  70                 return w1_ds2780_io(dev_info->w1_dev, buf, addr, count, io);
  71 }
  72
  73 static inline int ds2780_read8(struct ds2780_device_info *dev_info, u8 *val,
  74         int addr)
  75 {
  76         return ds2780_battery_io(dev_info, val, addr, sizeof(u8), 0);
  77 }
  78
  79 static int ds2780_read16(struct ds2780_device_info *dev_info, s16 *val,
  80         int addr)
  81 {
  82         int ret;
  83         u8 raw[2];
  84
  85         ret = ds2780_battery_io(dev_info, raw, addr, sizeof(raw), 0);
  86         if (ret < 0)
  87                 return ret;
  88
  89         *val = (raw[0] << 8) | raw[1];
  90
  91         return 0;
  92 }
  93
  94 static inline int ds2780_read_block(struct ds2780_device_info *dev_info,
  95         u8 *val, int addr, size_t count)
  96 {
  97         return ds2780_battery_io(dev_info, val, addr, count, 0);
  98 }
  99
 100 static inline int ds2780_write(struct ds2780_device_info *dev_info, u8 *val,
 101         int addr, size_t count)
 102 {
 103         return ds2780_battery_io(dev_info, val, addr, count, 1);
 104 }
 105
 106 static inline int ds2780_store_eeprom(struct device *dev, int addr)
 107 {
 108         return w1_ds2780_eeprom_cmd(dev, addr, W1_DS2780_COPY_DATA);
 109 }
 110
 111 static inline int ds2780_recall_eeprom(struct device *dev, int addr)
 112 {
 113         return w1_ds2780_eeprom_cmd(dev, addr, W1_DS2780_RECALL_DATA);
 114 }
 115
 116 static int ds2780_save_eeprom(struct ds2780_device_info *dev_info, int reg)
 117 {
 118         int ret;
 119
 120         ret = ds2780_store_eeprom(dev_info->w1_dev, reg);
 121         if (ret < 0)
 122                 return ret;
 123
 124         ret = ds2780_recall_eeprom(dev_info->w1_dev, reg);
 125         if (ret < 0)
 126                 return ret;
 127
 128         return 0;
 129 }
 130
 131 /* Set sense resistor value in mhos */
 132 static int ds2780_set_sense_register(struct ds2780_device_info *dev_info,
 133         u8 conductance)
 134 {
 135         int ret;
 136
 137         ret = ds2780_write(dev_info, &conductance,
 138                                 DS2780_RSNSP_REG, sizeof(u8));
 139         if (ret < 0)
 140                 return ret;
 141
 142         return ds2780_save_eeprom(dev_info, DS2780_RSNSP_REG);
 143 }
 144
 145 /* Get RSGAIN value from 0 to 1.999 in steps of 0.001 */
 146 static int ds2780_get_rsgain_register(struct ds2780_device_info *dev_info,
 147         u16 *rsgain)
 148 {
 149         return ds2780_read16(dev_info, rsgain, DS2780_RSGAIN_MSB_REG);
 150 }
 151
 152 /* Set RSGAIN value from 0 to 1.999 in steps of 0.001 */
 153 static int ds2780_set_rsgain_register(struct ds2780_device_info *dev_info,
 154         u16 rsgain)
 155 {
 156         int ret;
 157         u8 raw[] = {rsgain >> 8, rsgain & 0xFF};
 158
 159         ret = ds2780_write(dev_info, raw,
 160                                 DS2780_RSGAIN_MSB_REG, sizeof(raw));
 161         if (ret < 0)
 162                 return ret;
 163
 164         return ds2780_save_eeprom(dev_info, DS2780_RSGAIN_MSB_REG);
 165 }
 166
 167 static int ds2780_get_voltage(struct ds2780_device_info *dev_info,
 168         int *voltage_uV)
 169 {
 170         int ret;
 171         s16 voltage_raw;
 172
 173         /*
 174          * The voltage value is located in 10 bits across the voltage MSB
 175          * and LSB registers in two's compliment form
 176          * Sign bit of the voltage value is in bit 7 of the voltage MSB register
 177          * Bits 9 - 3 of the voltage value are in bits 6 - 0 of the
 178          * voltage MSB register
 179          * Bits 2 - 0 of the voltage value are in bits 7 - 5 of the
 180          * voltage LSB register
 181          */
 182         ret = ds2780_read16(dev_info, &voltage_raw,
 183                                 DS2780_VOLT_MSB_REG);
 184         if (ret < 0)
 185                 return ret;
 186
 187         /*
 188          * DS2780 reports voltage in units of 4.88mV, but the battery class
 189          * reports in units of uV, so convert by multiplying by 4880.
 190          */
 191         *voltage_uV = (voltage_raw / 32) * 4880;
 192         return 0;
 193 }
 194
 195 static int ds2780_get_temperature(struct ds2780_device_info *dev_info,
 196         int *temperature)
 197 {
 198         int ret;
 199         s16 temperature_raw;
 200
 201         /*
 202          * The temperature value is located in 10 bits across the temperature
 203          * MSB and LSB registers in two's compliment form
 204          * Sign bit of the temperature value is in bit 7 of the temperature
 205          * MSB register
 206          * Bits 9 - 3 of the temperature value are in bits 6 - 0 of the
 207          * temperature MSB register
 208          * Bits 2 - 0 of the temperature value are in bits 7 - 5 of the
 209          * temperature LSB register
 210          */
 211         ret = ds2780_read16(dev_info, &temperature_raw,
 212                                 DS2780_TEMP_MSB_REG);
 213         if (ret < 0)
 214                 return ret;
 215
 216         /*
 217          * Temperature is measured in units of 0.125 degrees celcius, the
 218          * power_supply class measures temperature in tenths of degrees
 219          * celsius. The temperature value is stored as a 10 bit number, plus
 220          * sign in the upper bits of a 16 bit register.
 221          */
 222         *temperature = ((temperature_raw / 32) * 125) / 100;
 223         return 0;
 224 }
 225
 226 static int ds2780_get_current(struct ds2780_device_info *dev_info,
 227         enum current_types type, int *current_uA)
 228 {
 229         int ret, sense_res;
 230         s16 current_raw;
 231         u8 sense_res_raw, reg_msb;
 232
 233         /*
 234          * The units of measurement for current are dependent on the value of
 235          * the sense resistor.
 236          */
 237         ret = ds2780_read8(dev_info, &sense_res_raw, DS2780_RSNSP_REG);
 238         if (ret < 0)
 239                 return ret;
 240
 241         if (sense_res_raw == 0) {
 242                 dev_err(dev_info->dev, "sense resistor value is 0\n");
 243                 return -EINVAL;
 244         }
 245         sense_res = 1000 / sense_res_raw;
 246
 247         if (type == CURRENT_NOW)
 248                 reg_msb = DS2780_CURRENT_MSB_REG;
 249         else if (type == CURRENT_AVG)
 250                 reg_msb = DS2780_IAVG_MSB_REG;
 251         else
 252                 return -EINVAL;
 253
 254         /*
 255          * The current value is located in 16 bits across the current MSB
 256          * and LSB registers in two's compliment form
 257          * Sign bit of the current value is in bit 7 of the current MSB register
 258          * Bits 14 - 8 of the current value are in bits 6 - 0 of the current
 259          * MSB register
 260          * Bits 7 - 0 of the current value are in bits 7 - 0 of the current
 261          * LSB register
 262          */
 263         ret = ds2780_read16(dev_info, &current_raw, reg_msb);
 264         if (ret < 0)
 265                 return ret;
 266
 267         *current_uA = current_raw * (DS2780_CURRENT_UNITS / sense_res);
 268         return 0;
 269 }
 270
 271 static int ds2780_get_accumulated_current(struct ds2780_device_info *dev_info,
 272         int *accumulated_current)
 273 {
 274         int ret, sense_res;
 275         s16 current_raw;
 276         u8 sense_res_raw;
 277
 278         /*
 279          * The units of measurement for accumulated current are dependent on
 280          * the value of the sense resistor.
 281          */
 282         ret = ds2780_read8(dev_info, &sense_res_raw, DS2780_RSNSP_REG);
 283         if (ret < 0)
 284                 return ret;
 285
 286         if (sense_res_raw == 0) {
 287                 dev_err(dev_info->dev, "sense resistor value is 0\n");
 288                 return -ENXIO;
 289         }
 290         sense_res = 1000 / sense_res_raw;
 291
 292         /*
 293          * The ACR value is located in 16 bits across the ACR MSB and
 294          * LSB registers
 295          * Bits 15 - 8 of the ACR value are in bits 7 - 0 of the ACR
 296          * MSB register
 297          * Bits 7 - 0 of the ACR value are in bits 7 - 0 of the ACR
 298          * LSB register
 299          */
 300         ret = ds2780_read16(dev_info, &current_raw, DS2780_ACR_MSB_REG);
 301         if (ret < 0)
 302                 return ret;
 303
 304         *accumulated_current = current_raw * (DS2780_CHARGE_UNITS / sense_res);
 305         return 0;
 306 }
 307
 308 static int ds2780_get_capacity(struct ds2780_device_info *dev_info,
 309         int *capacity)
 310 {
 311         int ret;
 312         u8 raw;
 313
 314         ret = ds2780_read8(dev_info, &raw, DS2780_RARC_REG);
 315         if (ret < 0)
 316                 return ret;
 317
 318         *capacity = raw;
 319         return raw;
 320 }
 321
 322 static int ds2780_get_status(struct ds2780_device_info *dev_info, int *status)
 323 {
 324         int ret, current_uA, capacity;
 325
 326         ret = ds2780_get_current(dev_info, CURRENT_NOW, &current_uA);
 327         if (ret < 0)
 328                 return ret;
 329
 330         ret = ds2780_get_capacity(dev_info, &capacity);
 331         if (ret < 0)
 332                 return ret;
 333
 334         if (capacity == 100)
 335                 *status = POWER_SUPPLY_STATUS_FULL;
 336         else if (current_uA == 0)
 337                 *status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 338         else if (current_uA < 0)
 339                 *status = POWER_SUPPLY_STATUS_DISCHARGING;
 340         else
 341                 *status = POWER_SUPPLY_STATUS_CHARGING;
 342
 343         return 0;
 344 }
 345
 346 static int ds2780_get_charge_now(struct ds2780_device_info *dev_info,
 347         int *charge_now)
 348 {
 349         int ret;
 350         u16 charge_raw;
 351
 352         /*
 353          * The RAAC value is located in 16 bits across the RAAC MSB and
 354          * LSB registers
 355          * Bits 15 - 8 of the RAAC value are in bits 7 - 0 of the RAAC
 356          * MSB register
 357          * Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC
 358          * LSB register
 359          */
 360         ret = ds2780_read16(dev_info, &charge_raw, DS2780_RAAC_MSB_REG);
 361         if (ret < 0)
 362                 return ret;
 363
 364         *charge_now = charge_raw * 1600;
 365         return 0;
 366 }
 367
 368 static int ds2780_get_control_register(struct ds2780_device_info *dev_info,
 369         u8 *control_reg)
 370 {
 371         return ds2780_read8(dev_info, control_reg, DS2780_CONTROL_REG);
 372 }
 373
 374 static int ds2780_set_control_register(struct ds2780_device_info *dev_info,
 375         u8 control_reg)
 376 {
 377         int ret;
 378
 379         ret = ds2780_write(dev_info, &control_reg,
 380                                 DS2780_CONTROL_REG, sizeof(u8));
 381         if (ret < 0)
 382                 return ret;
 383
 384         return ds2780_save_eeprom(dev_info, DS2780_CONTROL_REG);
 385 }
 386
 387 static int ds2780_battery_get_property(struct power_supply *psy,
 388         enum power_supply_property psp,
 389         union power_supply_propval *val)
 390 {
 391         int ret = 0;
 392         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 393
 394         switch (psp) {
 395         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 396                 ret = ds2780_get_voltage(dev_info, &val->intval);
 397                 break;
 398
 399         case POWER_SUPPLY_PROP_TEMP:
 400                 ret = ds2780_get_temperature(dev_info, &val->intval);
 401                 break;
 402
 403         case POWER_SUPPLY_PROP_MODEL_NAME:
 404                 val->strval = model;
 405                 break;
 406
 407         case POWER_SUPPLY_PROP_MANUFACTURER:
 408                 val->strval = manufacturer;
 409                 break;
 410
 411         case POWER_SUPPLY_PROP_CURRENT_NOW:
 412                 ret = ds2780_get_current(dev_info, CURRENT_NOW, &val->intval);
 413                 break;
 414
 415         case POWER_SUPPLY_PROP_CURRENT_AVG:
 416                 ret = ds2780_get_current(dev_info, CURRENT_AVG, &val->intval);
 417                 break;
 418
 419         case POWER_SUPPLY_PROP_STATUS:
 420                 ret = ds2780_get_status(dev_info, &val->intval);
 421                 break;
 422
 423         case POWER_SUPPLY_PROP_CAPACITY:
 424                 ret = ds2780_get_capacity(dev_info, &val->intval);
 425                 break;
 426
 427         case POWER_SUPPLY_PROP_CHARGE_COUNTER:
 428                 ret = ds2780_get_accumulated_current(dev_info, &val->intval);
 429                 break;
 430
 431         case POWER_SUPPLY_PROP_CHARGE_NOW:
 432                 ret = ds2780_get_charge_now(dev_info, &val->intval);
 433                 break;
 434
 435         default:
 436                 ret = -EINVAL;
 437         }
 438
 439         return ret;
 440 }
 441
 442 static enum power_supply_property ds2780_battery_props[] = {
 443         POWER_SUPPLY_PROP_STATUS,
 444         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 445         POWER_SUPPLY_PROP_TEMP,
 446         POWER_SUPPLY_PROP_MODEL_NAME,
 447         POWER_SUPPLY_PROP_MANUFACTURER,
 448         POWER_SUPPLY_PROP_CURRENT_NOW,
 449         POWER_SUPPLY_PROP_CURRENT_AVG,
 450         POWER_SUPPLY_PROP_CAPACITY,
 451         POWER_SUPPLY_PROP_CHARGE_COUNTER,
 452         POWER_SUPPLY_PROP_CHARGE_NOW,
 453 };
 454
 455 static ssize_t ds2780_get_pmod_enabled(struct device *dev,
 456         struct device_attribute *attr,
 457         char *buf)
 458 {
 459         int ret;
 460         u8 control_reg;
 461         struct power_supply *psy = to_power_supply(dev);
 462         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 463
 464         /* Get power mode */
 465         ret = ds2780_get_control_register(dev_info, &control_reg);
 466         if (ret < 0)
 467                 return ret;
 468
 469         return sprintf(buf, "%d\n",
 470                  !!(control_reg & DS2780_CONTROL_REG_PMOD));
 471 }
 472
 473 static ssize_t ds2780_set_pmod_enabled(struct device *dev,
 474         struct device_attribute *attr,
 475         const char *buf,
 476         size_t count)
 477 {
 478         int ret;
 479         u8 control_reg, new_setting;
 480         struct power_supply *psy = to_power_supply(dev);
 481         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 482
 483         /* Set power mode */
 484         ret = ds2780_get_control_register(dev_info, &control_reg);
 485         if (ret < 0)
 486                 return ret;
 487
 488         ret = kstrtou8(buf, 0, &new_setting);
 489         if (ret < 0)
 490                 return ret;
 491
 492         if ((new_setting != 0) && (new_setting != 1)) {
 493                 dev_err(dev_info->dev, "Invalid pmod setting (0 or 1)\n");
 494                 return -EINVAL;
 495         }
 496
 497         if (new_setting)
 498                 control_reg |= DS2780_CONTROL_REG_PMOD;
 499         else
 500                 control_reg &= ~DS2780_CONTROL_REG_PMOD;
 501
 502         ret = ds2780_set_control_register(dev_info, control_reg);
 503         if (ret < 0)
 504                 return ret;
 505
 506         return count;
 507 }
 508
 509 static ssize_t ds2780_get_sense_resistor_value(struct device *dev,
 510         struct device_attribute *attr,
 511         char *buf)
 512 {
 513         int ret;
 514         u8 sense_resistor;
 515         struct power_supply *psy = to_power_supply(dev);
 516         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 517
 518         ret = ds2780_read8(dev_info, &sense_resistor, DS2780_RSNSP_REG);
 519         if (ret < 0)
 520                 return ret;
 521
 522         ret = sprintf(buf, "%d\n", sense_resistor);
 523         return ret;
 524 }
 525
 526 static ssize_t ds2780_set_sense_resistor_value(struct device *dev,
 527         struct device_attribute *attr,
 528         const char *buf,
 529         size_t count)
 530 {
 531         int ret;
 532         u8 new_setting;
 533         struct power_supply *psy = to_power_supply(dev);
 534         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 535
 536         ret = kstrtou8(buf, 0, &new_setting);
 537         if (ret < 0)
 538                 return ret;
 539
 540         ret = ds2780_set_sense_register(dev_info, new_setting);
 541         if (ret < 0)
 542                 return ret;
 543
 544         return count;
 545 }
 546
 547 static ssize_t ds2780_get_rsgain_setting(struct device *dev,
 548         struct device_attribute *attr,
 549         char *buf)
 550 {
 551         int ret;
 552         u16 rsgain;
 553         struct power_supply *psy = to_power_supply(dev);
 554         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 555
 556         ret = ds2780_get_rsgain_register(dev_info, &rsgain);
 557         if (ret < 0)
 558                 return ret;
 559
 560         return sprintf(buf, "%d\n", rsgain);
 561 }
 562
 563 static ssize_t ds2780_set_rsgain_setting(struct device *dev,
 564         struct device_attribute *attr,
 565         const char *buf,
 566         size_t count)
 567 {
 568         int ret;
 569         u16 new_setting;
 570         struct power_supply *psy = to_power_supply(dev);
 571         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 572
 573         ret = kstrtou16(buf, 0, &new_setting);
 574         if (ret < 0)
 575                 return ret;
 576
 577         /* Gain can only be from 0 to 1.999 in steps of .001 */
 578         if (new_setting > 1999) {
 579                 dev_err(dev_info->dev, "Invalid rsgain setting (0 - 1999)\n");
 580                 return -EINVAL;
 581         }
 582
 583         ret = ds2780_set_rsgain_register(dev_info, new_setting);
 584         if (ret < 0)
 585                 return ret;
 586
 587         return count;
 588 }
 589
 590 static ssize_t ds2780_get_pio_pin(struct device *dev,
 591         struct device_attribute *attr,
 592         char *buf)
 593 {
 594         int ret;
 595         u8 sfr;
 596         struct power_supply *psy = to_power_supply(dev);
 597         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 598
 599         ret = ds2780_read8(dev_info, &sfr, DS2780_SFR_REG);
 600         if (ret < 0)
 601                 return ret;
 602
 603         ret = sprintf(buf, "%d\n", sfr & DS2780_SFR_REG_PIOSC);
 604         return ret;
 605 }
 606
 607 static ssize_t ds2780_set_pio_pin(struct device *dev,
 608         struct device_attribute *attr,
 609         const char *buf,
 610         size_t count)
 611 {
 612         int ret;
 613         u8 new_setting;
 614         struct power_supply *psy = to_power_supply(dev);
 615         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 616
 617         ret = kstrtou8(buf, 0, &new_setting);
 618         if (ret < 0)
 619                 return ret;
 620
 621         if ((new_setting != 0) && (new_setting != 1)) {
 622                 dev_err(dev_info->dev, "Invalid pio_pin setting (0 or 1)\n");
 623                 return -EINVAL;
 624         }
 625
 626         ret = ds2780_write(dev_info, &new_setting,
 627                                 DS2780_SFR_REG, sizeof(u8));
 628         if (ret < 0)
 629                 return ret;
 630
 631         return count;
 632 }
 633
 634 static ssize_t ds2780_read_param_eeprom_bin(struct file *filp,
 635                                 struct kobject *kobj,
 636                                 struct bin_attribute *bin_attr,
 637                                 char *buf, loff_t off, size_t count)
 638 {
 639         struct device *dev = container_of(kobj, struct device, kobj);
 640         struct power_supply *psy = to_power_supply(dev);
 641         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 642
 643         count = min_t(loff_t, count,
 644                 DS2780_EEPROM_BLOCK1_END -
 645                 DS2780_EEPROM_BLOCK1_START + 1 - off);
 646
 647         return ds2780_read_block(dev_info, buf,
 648                                 DS2780_EEPROM_BLOCK1_START + off, count);
 649 }
 650
 651 static ssize_t ds2780_write_param_eeprom_bin(struct file *filp,
 652                                 struct kobject *kobj,
 653                                 struct bin_attribute *bin_attr,
 654                                 char *buf, loff_t off, size_t count)
 655 {
 656         struct device *dev = container_of(kobj, struct device, kobj);
 657         struct power_supply *psy = to_power_supply(dev);
 658         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 659         int ret;
 660
 661         count = min_t(loff_t, count,
 662                 DS2780_EEPROM_BLOCK1_END -
 663                 DS2780_EEPROM_BLOCK1_START + 1 - off);
 664
 665         ret = ds2780_write(dev_info, buf,
 666                                 DS2780_EEPROM_BLOCK1_START + off, count);
 667         if (ret < 0)
 668                 return ret;
 669
 670         ret = ds2780_save_eeprom(dev_info, DS2780_EEPROM_BLOCK1_START);
 671         if (ret < 0)
 672                 return ret;
 673
 674         return count;
 675 }
 676
 677 static struct bin_attribute ds2780_param_eeprom_bin_attr = {
 678         .attr = {
 679                 .name = "param_eeprom",
 680                 .mode = S_IRUGO | S_IWUSR,
 681         },
 682         .size = DS2780_EEPROM_BLOCK1_END - DS2780_EEPROM_BLOCK1_START + 1,
 683         .read = ds2780_read_param_eeprom_bin,
 684         .write = ds2780_write_param_eeprom_bin,
 685 };
 686
 687 static ssize_t ds2780_read_user_eeprom_bin(struct file *filp,
 688                                 struct kobject *kobj,
 689                                 struct bin_attribute *bin_attr,
 690                                 char *buf, loff_t off, size_t count)
 691 {
 692         struct device *dev = container_of(kobj, struct device, kobj);
 693         struct power_supply *psy = to_power_supply(dev);
 694         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 695
 696         count = min_t(loff_t, count,
 697                 DS2780_EEPROM_BLOCK0_END -
 698                 DS2780_EEPROM_BLOCK0_START + 1 - off);
 699
 700         return ds2780_read_block(dev_info, buf,
 701                                 DS2780_EEPROM_BLOCK0_START + off, count);
 702 }
 703
 704 static ssize_t ds2780_write_user_eeprom_bin(struct file *filp,
 705                                 struct kobject *kobj,
 706                                 struct bin_attribute *bin_attr,
 707                                 char *buf, loff_t off, size_t count)
 708 {
 709         struct device *dev = container_of(kobj, struct device, kobj);
 710         struct power_supply *psy = to_power_supply(dev);
 711         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 712         int ret;
 713
 714         count = min_t(loff_t, count,
 715                 DS2780_EEPROM_BLOCK0_END -
 716                 DS2780_EEPROM_BLOCK0_START + 1 - off);
 717
 718         ret = ds2780_write(dev_info, buf,
 719                                 DS2780_EEPROM_BLOCK0_START + off, count);
 720         if (ret < 0)
 721                 return ret;
 722
 723         ret = ds2780_save_eeprom(dev_info, DS2780_EEPROM_BLOCK0_START);
 724         if (ret < 0)
 725                 return ret;
 726
 727         return count;
 728 }
 729
 730 static struct bin_attribute ds2780_user_eeprom_bin_attr = {
 731         .attr = {
 732                 .name = "user_eeprom",
 733                 .mode = S_IRUGO | S_IWUSR,
 734         },
 735         .size = DS2780_EEPROM_BLOCK0_END - DS2780_EEPROM_BLOCK0_START + 1,
 736         .read = ds2780_read_user_eeprom_bin,
 737         .write = ds2780_write_user_eeprom_bin,
 738 };
 739
 740 static DEVICE_ATTR(pmod_enabled, S_IRUGO | S_IWUSR, ds2780_get_pmod_enabled,
 741         ds2780_set_pmod_enabled);
 742 static DEVICE_ATTR(sense_resistor_value, S_IRUGO | S_IWUSR,
 743         ds2780_get_sense_resistor_value, ds2780_set_sense_resistor_value);
 744 static DEVICE_ATTR(rsgain_setting, S_IRUGO | S_IWUSR, ds2780_get_rsgain_setting,
 745         ds2780_set_rsgain_setting);
 746 static DEVICE_ATTR(pio_pin, S_IRUGO | S_IWUSR, ds2780_get_pio_pin,
 747         ds2780_set_pio_pin);
 748
 749
 750 static struct attribute *ds2780_attributes[] = {
 751         &dev_attr_pmod_enabled.attr,
 752         &dev_attr_sense_resistor_value.attr,
 753         &dev_attr_rsgain_setting.attr,
 754         &dev_attr_pio_pin.attr,
 755         NULL
 756 };
 757
 758 static const struct attribute_group ds2780_attr_group = {
 759         .attrs = ds2780_attributes,
 760 };
 761
 762 static int __devinit ds2780_battery_probe(struct platform_device *pdev)
 763 {
 764         int ret = 0;
 765         struct ds2780_device_info *dev_info;
 766
 767         dev_info = kzalloc(sizeof(*dev_info), GFP_KERNEL);
 768         if (!dev_info) {
 769                 ret = -ENOMEM;
 770                 goto fail;
 771         }
 772
 773         platform_set_drvdata(pdev, dev_info);
 774
 775         dev_info->dev                   = &pdev->dev;
 776         dev_info->w1_dev                = pdev->dev.parent;
 777         dev_info->bat.name              = dev_name(&pdev->dev);
 778         dev_info->bat.type              = POWER_SUPPLY_TYPE_BATTERY;
 779         dev_info->bat.properties        = ds2780_battery_props;
 780         dev_info->bat.num_properties    = ARRAY_SIZE(ds2780_battery_props);
 781         dev_info->bat.get_property      = ds2780_battery_get_property;
 782         dev_info->mutex_holder          = current;
 783
 784         ret = power_supply_register(&pdev->dev, &dev_info->bat);
 785         if (ret) {
 786                 dev_err(dev_info->dev, "failed to register battery\n");
 787                 goto fail_free_info;
 788         }
 789
 790         ret = sysfs_create_group(&dev_info->bat.dev->kobj, &ds2780_attr_group);
 791         if (ret) {
 792                 dev_err(dev_info->dev, "failed to create sysfs group\n");
 793                 goto fail_unregister;
 794         }
 795
 796         ret = sysfs_create_bin_file(&dev_info->bat.dev->kobj,
 797                                         &ds2780_param_eeprom_bin_attr);
 798         if (ret) {
 799                 dev_err(dev_info->dev,
 800                                 "failed to create param eeprom bin file");
 801                 goto fail_remove_group;
 802         }
 803
 804         ret = sysfs_create_bin_file(&dev_info->bat.dev->kobj,
 805                                         &ds2780_user_eeprom_bin_attr);
 806         if (ret) {
 807                 dev_err(dev_info->dev,
 808                                 "failed to create user eeprom bin file");
 809                 goto fail_remove_bin_file;
 810         }
 811
 812         dev_info->mutex_holder = NULL;
 813
 814         return 0;
 815
 816 fail_remove_bin_file:
 817         sysfs_remove_bin_file(&dev_info->bat.dev->kobj,
 818                                 &ds2780_param_eeprom_bin_attr);
 819 fail_remove_group:
 820         sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2780_attr_group);
 821 fail_unregister:
 822         power_supply_unregister(&dev_info->bat);
 823 fail_free_info:
 824         kfree(dev_info);
 825 fail:
 826         return ret;
 827 }
 828
 829 static int __devexit ds2780_battery_remove(struct platform_device *pdev)
 830 {
 831         struct ds2780_device_info *dev_info = platform_get_drvdata(pdev);
 832
 833         dev_info->mutex_holder = current;
 834
 835         /* remove attributes */
 836         sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2780_attr_group);
 837
 838         power_supply_unregister(&dev_info->bat);
 839
 840         kfree(dev_info);
 841         return 0;
 842 }
 843
 844 static struct platform_driver ds2780_battery_driver = {
 845         .driver = {
 846                 .name = "ds2780-battery",
 847         },
 848         .probe    = ds2780_battery_probe,
 849         .remove   = __devexit_p(ds2780_battery_remove),
 850 };
 851
 852 module_platform_driver(ds2780_battery_driver);
 853
 854 MODULE_LICENSE("GPL");
 855 MODULE_AUTHOR("Clifton Barnes <cabarnes@indesign-llc.com>");
 856 MODULE_DESCRIPTION("Maxim/Dallas DS2780 Stand-Alone Fuel Gauage IC driver");
 857 MODULE_ALIAS("platform:ds2780-battery");