linux/drivers/power/ds2780_battery.c
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   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
  38struct ds2780_device_info {
  39        struct device *dev;
  40        struct power_supply bat;
  41        struct device *w1_dev;
  42};
  43
  44enum current_types {
  45        CURRENT_NOW,
  46        CURRENT_AVG,
  47};
  48
  49static const char model[] = "DS2780";
  50static const char manufacturer[] = "Maxim/Dallas";
  51
  52static inline struct ds2780_device_info *to_ds2780_device_info(
  53        struct power_supply *psy)
  54{
  55        return container_of(psy, struct ds2780_device_info, bat);
  56}
  57
  58static inline struct power_supply *to_power_supply(struct device *dev)
  59{
  60        return dev_get_drvdata(dev);
  61}
  62
  63static inline int ds2780_read8(struct device *dev, u8 *val, int addr)
  64{
  65        return w1_ds2780_io(dev, val, addr, sizeof(u8), 0);
  66}
  67
  68static int ds2780_read16(struct device *dev, s16 *val, int addr)
  69{
  70        int ret;
  71        u8 raw[2];
  72
  73        ret = w1_ds2780_io(dev, raw, addr, sizeof(u8) * 2, 0);
  74        if (ret < 0)
  75                return ret;
  76
  77        *val = (raw[0] << 8) | raw[1];
  78
  79        return 0;
  80}
  81
  82static inline int ds2780_read_block(struct device *dev, u8 *val, int addr,
  83        size_t count)
  84{
  85        return w1_ds2780_io(dev, val, addr, count, 0);
  86}
  87
  88static inline int ds2780_write(struct device *dev, u8 *val, int addr,
  89        size_t count)
  90{
  91        return w1_ds2780_io(dev, val, addr, count, 1);
  92}
  93
  94static inline int ds2780_store_eeprom(struct device *dev, int addr)
  95{
  96        return w1_ds2780_eeprom_cmd(dev, addr, W1_DS2780_COPY_DATA);
  97}
  98
  99static inline int ds2780_recall_eeprom(struct device *dev, int addr)
 100{
 101        return w1_ds2780_eeprom_cmd(dev, addr, W1_DS2780_RECALL_DATA);
 102}
 103
 104static int ds2780_save_eeprom(struct ds2780_device_info *dev_info, int reg)
 105{
 106        int ret;
 107
 108        ret = ds2780_store_eeprom(dev_info->w1_dev, reg);
 109        if (ret < 0)
 110                return ret;
 111
 112        ret = ds2780_recall_eeprom(dev_info->w1_dev, reg);
 113        if (ret < 0)
 114                return ret;
 115
 116        return 0;
 117}
 118
 119/* Set sense resistor value in mhos */
 120static int ds2780_set_sense_register(struct ds2780_device_info *dev_info,
 121        u8 conductance)
 122{
 123        int ret;
 124
 125        ret = ds2780_write(dev_info->w1_dev, &conductance,
 126                                DS2780_RSNSP_REG, sizeof(u8));
 127        if (ret < 0)
 128                return ret;
 129
 130        return ds2780_save_eeprom(dev_info, DS2780_RSNSP_REG);
 131}
 132
 133/* Get RSGAIN value from 0 to 1.999 in steps of 0.001 */
 134static int ds2780_get_rsgain_register(struct ds2780_device_info *dev_info,
 135        u16 *rsgain)
 136{
 137        return ds2780_read16(dev_info->w1_dev, rsgain, DS2780_RSGAIN_MSB_REG);
 138}
 139
 140/* Set RSGAIN value from 0 to 1.999 in steps of 0.001 */
 141static int ds2780_set_rsgain_register(struct ds2780_device_info *dev_info,
 142        u16 rsgain)
 143{
 144        int ret;
 145        u8 raw[] = {rsgain >> 8, rsgain & 0xFF};
 146
 147        ret = ds2780_write(dev_info->w1_dev, raw,
 148                                DS2780_RSGAIN_MSB_REG, sizeof(u8) * 2);
 149        if (ret < 0)
 150                return ret;
 151
 152        return ds2780_save_eeprom(dev_info, DS2780_RSGAIN_MSB_REG);
 153}
 154
 155static int ds2780_get_voltage(struct ds2780_device_info *dev_info,
 156        int *voltage_uV)
 157{
 158        int ret;
 159        s16 voltage_raw;
 160
 161        /*
 162         * The voltage value is located in 10 bits across the voltage MSB
 163         * and LSB registers in two's compliment form
 164         * Sign bit of the voltage value is in bit 7 of the voltage MSB register
 165         * Bits 9 - 3 of the voltage value are in bits 6 - 0 of the
 166         * voltage MSB register
 167         * Bits 2 - 0 of the voltage value are in bits 7 - 5 of the
 168         * voltage LSB register
 169         */
 170        ret = ds2780_read16(dev_info->w1_dev, &voltage_raw,
 171                                DS2780_VOLT_MSB_REG);
 172        if (ret < 0)
 173                return ret;
 174
 175        /*
 176         * DS2780 reports voltage in units of 4.88mV, but the battery class
 177         * reports in units of uV, so convert by multiplying by 4880.
 178         */
 179        *voltage_uV = (voltage_raw / 32) * 4880;
 180        return 0;
 181}
 182
 183static int ds2780_get_temperature(struct ds2780_device_info *dev_info,
 184        int *temperature)
 185{
 186        int ret;
 187        s16 temperature_raw;
 188
 189        /*
 190         * The temperature value is located in 10 bits across the temperature
 191         * MSB and LSB registers in two's compliment form
 192         * Sign bit of the temperature value is in bit 7 of the temperature
 193         * MSB register
 194         * Bits 9 - 3 of the temperature value are in bits 6 - 0 of the
 195         * temperature MSB register
 196         * Bits 2 - 0 of the temperature value are in bits 7 - 5 of the
 197         * temperature LSB register
 198         */
 199        ret = ds2780_read16(dev_info->w1_dev, &temperature_raw,
 200                                DS2780_TEMP_MSB_REG);
 201        if (ret < 0)
 202                return ret;
 203
 204        /*
 205         * Temperature is measured in units of 0.125 degrees celcius, the
 206         * power_supply class measures temperature in tenths of degrees
 207         * celsius. The temperature value is stored as a 10 bit number, plus
 208         * sign in the upper bits of a 16 bit register.
 209         */
 210        *temperature = ((temperature_raw / 32) * 125) / 100;
 211        return 0;
 212}
 213
 214static int ds2780_get_current(struct ds2780_device_info *dev_info,
 215        enum current_types type, int *current_uA)
 216{
 217        int ret, sense_res;
 218        s16 current_raw;
 219        u8 sense_res_raw, reg_msb;
 220
 221        /*
 222         * The units of measurement for current are dependent on the value of
 223         * the sense resistor.
 224         */
 225        ret = ds2780_read8(dev_info->w1_dev, &sense_res_raw, DS2780_RSNSP_REG);
 226        if (ret < 0)
 227                return ret;
 228
 229        if (sense_res_raw == 0) {
 230                dev_err(dev_info->dev, "sense resistor value is 0\n");
 231                return -ENXIO;
 232        }
 233        sense_res = 1000 / sense_res_raw;
 234
 235        if (type == CURRENT_NOW)
 236                reg_msb = DS2780_CURRENT_MSB_REG;
 237        else if (type == CURRENT_AVG)
 238                reg_msb = DS2780_IAVG_MSB_REG;
 239        else
 240                return -EINVAL;
 241
 242        /*
 243         * The current value is located in 16 bits across the current MSB
 244         * and LSB registers in two's compliment form
 245         * Sign bit of the current value is in bit 7 of the current MSB register
 246         * Bits 14 - 8 of the current value are in bits 6 - 0 of the current
 247         * MSB register
 248         * Bits 7 - 0 of the current value are in bits 7 - 0 of the current
 249         * LSB register
 250         */
 251        ret = ds2780_read16(dev_info->w1_dev, &current_raw, reg_msb);
 252        if (ret < 0)
 253                return ret;
 254
 255        *current_uA = current_raw * (DS2780_CURRENT_UNITS / sense_res);
 256        return 0;
 257}
 258
 259static int ds2780_get_accumulated_current(struct ds2780_device_info *dev_info,
 260        int *accumulated_current)
 261{
 262        int ret, sense_res;
 263        s16 current_raw;
 264        u8 sense_res_raw;
 265
 266        /*
 267         * The units of measurement for accumulated current are dependent on
 268         * the value of the sense resistor.
 269         */
 270        ret = ds2780_read8(dev_info->w1_dev, &sense_res_raw, DS2780_RSNSP_REG);
 271        if (ret < 0)
 272                return ret;
 273
 274        if (sense_res_raw == 0) {
 275                dev_err(dev_info->dev, "sense resistor value is 0\n");
 276                return -ENXIO;
 277        }
 278        sense_res = 1000 / sense_res_raw;
 279
 280        /*
 281         * The ACR value is located in 16 bits across the ACR MSB and
 282         * LSB registers
 283         * Bits 15 - 8 of the ACR value are in bits 7 - 0 of the ACR
 284         * MSB register
 285         * Bits 7 - 0 of the ACR value are in bits 7 - 0 of the ACR
 286         * LSB register
 287         */
 288        ret = ds2780_read16(dev_info->w1_dev, &current_raw, DS2780_ACR_MSB_REG);
 289        if (ret < 0)
 290                return ret;
 291
 292        *accumulated_current = current_raw * (DS2780_CHARGE_UNITS / sense_res);
 293        return 0;
 294}
 295
 296static int ds2780_get_capacity(struct ds2780_device_info *dev_info,
 297        int *capacity)
 298{
 299        int ret;
 300        u8 raw;
 301
 302        ret = ds2780_read8(dev_info->w1_dev, &raw, DS2780_RARC_REG);
 303        if (ret < 0)
 304                return ret;
 305
 306        *capacity = raw;
 307        return raw;
 308}
 309
 310static int ds2780_get_status(struct ds2780_device_info *dev_info, int *status)
 311{
 312        int ret, current_uA, capacity;
 313
 314        ret = ds2780_get_current(dev_info, CURRENT_NOW, &current_uA);
 315        if (ret < 0)
 316                return ret;
 317
 318        ret = ds2780_get_capacity(dev_info, &capacity);
 319        if (ret < 0)
 320                return ret;
 321
 322        if (capacity == 100)
 323                *status = POWER_SUPPLY_STATUS_FULL;
 324        else if (current_uA == 0)
 325                *status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 326        else if (current_uA < 0)
 327                *status = POWER_SUPPLY_STATUS_DISCHARGING;
 328        else
 329                *status = POWER_SUPPLY_STATUS_CHARGING;
 330
 331        return 0;
 332}
 333
 334static int ds2780_get_charge_now(struct ds2780_device_info *dev_info,
 335        int *charge_now)
 336{
 337        int ret;
 338        u16 charge_raw;
 339
 340        /*
 341         * The RAAC value is located in 16 bits across the RAAC MSB and
 342         * LSB registers
 343         * Bits 15 - 8 of the RAAC value are in bits 7 - 0 of the RAAC
 344         * MSB register
 345         * Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC
 346         * LSB register
 347         */
 348        ret = ds2780_read16(dev_info->w1_dev, &charge_raw, DS2780_RAAC_MSB_REG);
 349        if (ret < 0)
 350                return ret;
 351
 352        *charge_now = charge_raw * 1600;
 353        return 0;
 354}
 355
 356static int ds2780_get_control_register(struct ds2780_device_info *dev_info,
 357        u8 *control_reg)
 358{
 359        return ds2780_read8(dev_info->w1_dev, control_reg, DS2780_CONTROL_REG);
 360}
 361
 362static int ds2780_set_control_register(struct ds2780_device_info *dev_info,
 363        u8 control_reg)
 364{
 365        int ret;
 366
 367        ret = ds2780_write(dev_info->w1_dev, &control_reg,
 368                                DS2780_CONTROL_REG, sizeof(u8));
 369        if (ret < 0)
 370                return ret;
 371
 372        return ds2780_save_eeprom(dev_info, DS2780_CONTROL_REG);
 373}
 374
 375static int ds2780_battery_get_property(struct power_supply *psy,
 376        enum power_supply_property psp,
 377        union power_supply_propval *val)
 378{
 379        int ret = 0;
 380        struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 381
 382        switch (psp) {
 383        case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 384                ret = ds2780_get_voltage(dev_info, &val->intval);
 385                break;
 386
 387        case POWER_SUPPLY_PROP_TEMP:
 388                ret = ds2780_get_temperature(dev_info, &val->intval);
 389                break;
 390
 391        case POWER_SUPPLY_PROP_MODEL_NAME:
 392                val->strval = model;
 393                break;
 394
 395        case POWER_SUPPLY_PROP_MANUFACTURER:
 396                val->strval = manufacturer;
 397                break;
 398
 399        case POWER_SUPPLY_PROP_CURRENT_NOW:
 400                ret = ds2780_get_current(dev_info, CURRENT_NOW, &val->intval);
 401                break;
 402
 403        case POWER_SUPPLY_PROP_CURRENT_AVG:
 404                ret = ds2780_get_current(dev_info, CURRENT_AVG, &val->intval);
 405                break;
 406
 407        case POWER_SUPPLY_PROP_STATUS:
 408                ret = ds2780_get_status(dev_info, &val->intval);
 409                break;
 410
 411        case POWER_SUPPLY_PROP_CAPACITY:
 412                ret = ds2780_get_capacity(dev_info, &val->intval);
 413                break;
 414
 415        case POWER_SUPPLY_PROP_CHARGE_COUNTER:
 416                ret = ds2780_get_accumulated_current(dev_info, &val->intval);
 417                break;
 418
 419        case POWER_SUPPLY_PROP_CHARGE_NOW:
 420                ret = ds2780_get_charge_now(dev_info, &val->intval);
 421                break;
 422
 423        default:
 424                ret = -EINVAL;
 425        }
 426
 427        return ret;
 428}
 429
 430static enum power_supply_property ds2780_battery_props[] = {
 431        POWER_SUPPLY_PROP_STATUS,
 432        POWER_SUPPLY_PROP_VOLTAGE_NOW,
 433        POWER_SUPPLY_PROP_TEMP,
 434        POWER_SUPPLY_PROP_MODEL_NAME,
 435        POWER_SUPPLY_PROP_MANUFACTURER,
 436        POWER_SUPPLY_PROP_CURRENT_NOW,
 437        POWER_SUPPLY_PROP_CURRENT_AVG,
 438        POWER_SUPPLY_PROP_CAPACITY,
 439        POWER_SUPPLY_PROP_CHARGE_COUNTER,
 440        POWER_SUPPLY_PROP_CHARGE_NOW,
 441};
 442
 443static ssize_t ds2780_get_pmod_enabled(struct device *dev,
 444        struct device_attribute *attr,
 445        char *buf)
 446{
 447        int ret;
 448        u8 control_reg;
 449        struct power_supply *psy = to_power_supply(dev);
 450        struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 451
 452        /* Get power mode */
 453        ret = ds2780_get_control_register(dev_info, &control_reg);
 454        if (ret < 0)
 455                return ret;
 456
 457        return sprintf(buf, "%d\n",
 458                 !!(control_reg & DS2780_CONTROL_REG_PMOD));
 459}
 460
 461static ssize_t ds2780_set_pmod_enabled(struct device *dev,
 462        struct device_attribute *attr,
 463        const char *buf,
 464        size_t count)
 465{
 466        int ret;
 467        u8 control_reg, new_setting;
 468        struct power_supply *psy = to_power_supply(dev);
 469        struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 470
 471        /* Set power mode */
 472        ret = ds2780_get_control_register(dev_info, &control_reg);
 473        if (ret < 0)
 474                return ret;
 475
 476        ret = kstrtou8(buf, 0, &new_setting);
 477        if (ret < 0)
 478                return ret;
 479
 480        if ((new_setting != 0) && (new_setting != 1)) {
 481                dev_err(dev_info->dev, "Invalid pmod setting (0 or 1)\n");
 482                return -EINVAL;
 483        }
 484
 485        if (new_setting)
 486                control_reg |= DS2780_CONTROL_REG_PMOD;
 487        else
 488                control_reg &= ~DS2780_CONTROL_REG_PMOD;
 489
 490        ret = ds2780_set_control_register(dev_info, control_reg);
 491        if (ret < 0)
 492                return ret;
 493
 494        return count;
 495}
 496
 497static ssize_t ds2780_get_sense_resistor_value(struct device *dev,
 498        struct device_attribute *attr,
 499        char *buf)
 500{
 501        int ret;
 502        u8 sense_resistor;
 503        struct power_supply *psy = to_power_supply(dev);
 504        struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 505
 506        ret = ds2780_read8(dev_info->w1_dev, &sense_resistor, DS2780_RSNSP_REG);
 507        if (ret < 0)
 508                return ret;
 509
 510        ret = sprintf(buf, "%d\n", sense_resistor);
 511        return ret;
 512}
 513
 514static ssize_t ds2780_set_sense_resistor_value(struct device *dev,
 515        struct device_attribute *attr,
 516        const char *buf,
 517        size_t count)
 518{
 519        int ret;
 520        u8 new_setting;
 521        struct power_supply *psy = to_power_supply(dev);
 522        struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 523
 524        ret = kstrtou8(buf, 0, &new_setting);
 525        if (ret < 0)
 526                return ret;
 527
 528        ret = ds2780_set_sense_register(dev_info, new_setting);
 529        if (ret < 0)
 530                return ret;
 531
 532        return count;
 533}
 534
 535static ssize_t ds2780_get_rsgain_setting(struct device *dev,
 536        struct device_attribute *attr,
 537        char *buf)
 538{
 539        int ret;
 540        u16 rsgain;
 541        struct power_supply *psy = to_power_supply(dev);
 542        struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 543
 544        ret = ds2780_get_rsgain_register(dev_info, &rsgain);
 545        if (ret < 0)
 546                return ret;
 547
 548        return sprintf(buf, "%d\n", rsgain);
 549}
 550
 551static ssize_t ds2780_set_rsgain_setting(struct device *dev,
 552        struct device_attribute *attr,
 553        const char *buf,
 554        size_t count)
 555{
 556        int ret;
 557        u16 new_setting;
 558        struct power_supply *psy = to_power_supply(dev);
 559        struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 560
 561        ret = kstrtou16(buf, 0, &new_setting);
 562        if (ret < 0)
 563                return ret;
 564
 565        /* Gain can only be from 0 to 1.999 in steps of .001 */
 566        if (new_setting > 1999) {
 567                dev_err(dev_info->dev, "Invalid rsgain setting (0 - 1999)\n");
 568                return -EINVAL;
 569        }
 570
 571        ret = ds2780_set_rsgain_register(dev_info, new_setting);
 572        if (ret < 0)
 573                return ret;
 574
 575        return count;
 576}
 577
 578static ssize_t ds2780_get_pio_pin(struct device *dev,
 579        struct device_attribute *attr,
 580        char *buf)
 581{
 582        int ret;
 583        u8 sfr;
 584        struct power_supply *psy = to_power_supply(dev);
 585        struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 586
 587        ret = ds2780_read8(dev_info->w1_dev, &sfr, DS2780_SFR_REG);
 588        if (ret < 0)
 589                return ret;
 590
 591        ret = sprintf(buf, "%d\n", sfr & DS2780_SFR_REG_PIOSC);
 592        return ret;
 593}
 594
 595static ssize_t ds2780_set_pio_pin(struct device *dev,
 596        struct device_attribute *attr,
 597        const char *buf,
 598        size_t count)
 599{
 600        int ret;
 601        u8 new_setting;
 602        struct power_supply *psy = to_power_supply(dev);
 603        struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 604
 605        ret = kstrtou8(buf, 0, &new_setting);
 606        if (ret < 0)
 607                return ret;
 608
 609        if ((new_setting != 0) && (new_setting != 1)) {
 610                dev_err(dev_info->dev, "Invalid pio_pin setting (0 or 1)\n");
 611                return -EINVAL;
 612        }
 613
 614        ret = ds2780_write(dev_info->w1_dev, &new_setting,
 615                                DS2780_SFR_REG, sizeof(u8));
 616        if (ret < 0)
 617                return ret;
 618
 619        return count;
 620}
 621
 622static ssize_t ds2780_read_param_eeprom_bin(struct file *filp,
 623                                struct kobject *kobj,
 624                                struct bin_attribute *bin_attr,
 625                                char *buf, loff_t off, size_t count)
 626{
 627        struct device *dev = container_of(kobj, struct device, kobj);
 628        struct power_supply *psy = to_power_supply(dev);
 629        struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 630
 631        count = min_t(loff_t, count,
 632                DS2780_EEPROM_BLOCK1_END -
 633                DS2780_EEPROM_BLOCK1_START + 1 - off);
 634
 635        return ds2780_read_block(dev_info->w1_dev, buf,
 636                                DS2780_EEPROM_BLOCK1_START + off, count);
 637}
 638
 639static 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        count = min_t(loff_t, count,
 650                DS2780_EEPROM_BLOCK1_END -
 651                DS2780_EEPROM_BLOCK1_START + 1 - off);
 652
 653        ret = ds2780_write(dev_info->w1_dev, buf,
 654                                DS2780_EEPROM_BLOCK1_START + off, count);
 655        if (ret < 0)
 656                return ret;
 657
 658        ret = ds2780_save_eeprom(dev_info, DS2780_EEPROM_BLOCK1_START);
 659        if (ret < 0)
 660                return ret;
 661
 662        return count;
 663}
 664
 665static struct bin_attribute ds2780_param_eeprom_bin_attr = {
 666        .attr = {
 667                .name = "param_eeprom",
 668                .mode = S_IRUGO | S_IWUSR,
 669        },
 670        .size = DS2780_EEPROM_BLOCK1_END - DS2780_EEPROM_BLOCK1_START + 1,
 671        .read = ds2780_read_param_eeprom_bin,
 672        .write = ds2780_write_param_eeprom_bin,
 673};
 674
 675static ssize_t ds2780_read_user_eeprom_bin(struct file *filp,
 676                                struct kobject *kobj,
 677                                struct bin_attribute *bin_attr,
 678                                char *buf, loff_t off, size_t count)
 679{
 680        struct device *dev = container_of(kobj, struct device, kobj);
 681        struct power_supply *psy = to_power_supply(dev);
 682        struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 683
 684        count = min_t(loff_t, count,
 685                DS2780_EEPROM_BLOCK0_END -
 686                DS2780_EEPROM_BLOCK0_START + 1 - off);
 687
 688        return ds2780_read_block(dev_info->w1_dev, buf,
 689                                DS2780_EEPROM_BLOCK0_START + off, count);
 690
 691}
 692
 693static ssize_t ds2780_write_user_eeprom_bin(struct file *filp,
 694                                struct kobject *kobj,
 695                                struct bin_attribute *bin_attr,
 696                                char *buf, loff_t off, size_t count)
 697{
 698        struct device *dev = container_of(kobj, struct device, kobj);
 699        struct power_supply *psy = to_power_supply(dev);
 700        struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 701        int ret;
 702
 703        count = min_t(loff_t, count,
 704                DS2780_EEPROM_BLOCK0_END -
 705                DS2780_EEPROM_BLOCK0_START + 1 - off);
 706
 707        ret = ds2780_write(dev_info->w1_dev, buf,
 708                                DS2780_EEPROM_BLOCK0_START + off, count);
 709        if (ret < 0)
 710                return ret;
 711
 712        ret = ds2780_save_eeprom(dev_info, DS2780_EEPROM_BLOCK0_START);
 713        if (ret < 0)
 714                return ret;
 715
 716        return count;
 717}
 718
 719static struct bin_attribute ds2780_user_eeprom_bin_attr = {
 720        .attr = {
 721                .name = "user_eeprom",
 722                .mode = S_IRUGO | S_IWUSR,
 723        },
 724        .size = DS2780_EEPROM_BLOCK0_END - DS2780_EEPROM_BLOCK0_START + 1,
 725        .read = ds2780_read_user_eeprom_bin,
 726        .write = ds2780_write_user_eeprom_bin,
 727};
 728
 729static DEVICE_ATTR(pmod_enabled, S_IRUGO | S_IWUSR, ds2780_get_pmod_enabled,
 730        ds2780_set_pmod_enabled);
 731static DEVICE_ATTR(sense_resistor_value, S_IRUGO | S_IWUSR,
 732        ds2780_get_sense_resistor_value, ds2780_set_sense_resistor_value);
 733static DEVICE_ATTR(rsgain_setting, S_IRUGO | S_IWUSR, ds2780_get_rsgain_setting,
 734        ds2780_set_rsgain_setting);
 735static DEVICE_ATTR(pio_pin, S_IRUGO | S_IWUSR, ds2780_get_pio_pin,
 736        ds2780_set_pio_pin);
 737
 738
 739static struct attribute *ds2780_attributes[] = {
 740        &dev_attr_pmod_enabled.attr,
 741        &dev_attr_sense_resistor_value.attr,
 742        &dev_attr_rsgain_setting.attr,
 743        &dev_attr_pio_pin.attr,
 744        NULL
 745};
 746
 747static const struct attribute_group ds2780_attr_group = {
 748        .attrs = ds2780_attributes,
 749};
 750
 751static int __devinit ds2780_battery_probe(struct platform_device *pdev)
 752{
 753        int ret = 0;
 754        struct ds2780_device_info *dev_info;
 755
 756        dev_info = kzalloc(sizeof(*dev_info), GFP_KERNEL);
 757        if (!dev_info) {
 758                ret = -ENOMEM;
 759                goto fail;
 760        }
 761
 762        platform_set_drvdata(pdev, dev_info);
 763
 764        dev_info->dev                   = &pdev->dev;
 765        dev_info->w1_dev                = pdev->dev.parent;
 766        dev_info->bat.name              = dev_name(&pdev->dev);
 767        dev_info->bat.type              = POWER_SUPPLY_TYPE_BATTERY;
 768        dev_info->bat.properties        = ds2780_battery_props;
 769        dev_info->bat.num_properties    = ARRAY_SIZE(ds2780_battery_props);
 770        dev_info->bat.get_property      = ds2780_battery_get_property;
 771
 772        ret = power_supply_register(&pdev->dev, &dev_info->bat);
 773        if (ret) {
 774                dev_err(dev_info->dev, "failed to register battery\n");
 775                goto fail_free_info;
 776        }
 777
 778        ret = sysfs_create_group(&dev_info->bat.dev->kobj, &ds2780_attr_group);
 779        if (ret) {
 780                dev_err(dev_info->dev, "failed to create sysfs group\n");
 781                goto fail_unregister;
 782        }
 783
 784        ret = sysfs_create_bin_file(&dev_info->bat.dev->kobj,
 785                                        &ds2780_param_eeprom_bin_attr);
 786        if (ret) {
 787                dev_err(dev_info->dev,
 788                                "failed to create param eeprom bin file");
 789                goto fail_remove_group;
 790        }
 791
 792        ret = sysfs_create_bin_file(&dev_info->bat.dev->kobj,
 793                                        &ds2780_user_eeprom_bin_attr);
 794        if (ret) {
 795                dev_err(dev_info->dev,
 796                                "failed to create user eeprom bin file");
 797                goto fail_remove_bin_file;
 798        }
 799
 800        return 0;
 801
 802fail_remove_bin_file:
 803        sysfs_remove_bin_file(&dev_info->bat.dev->kobj,
 804                                &ds2780_param_eeprom_bin_attr);
 805fail_remove_group:
 806        sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2780_attr_group);
 807fail_unregister:
 808        power_supply_unregister(&dev_info->bat);
 809fail_free_info:
 810        kfree(dev_info);
 811fail:
 812        return ret;
 813}
 814
 815static int __devexit ds2780_battery_remove(struct platform_device *pdev)
 816{
 817        struct ds2780_device_info *dev_info = platform_get_drvdata(pdev);
 818
 819        /* remove attributes */
 820        sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2780_attr_group);
 821
 822        power_supply_unregister(&dev_info->bat);
 823
 824        kfree(dev_info);
 825        return 0;
 826}
 827
 828MODULE_ALIAS("platform:ds2780-battery");
 829
 830static struct platform_driver ds2780_battery_driver = {
 831        .driver = {
 832                .name = "ds2780-battery",
 833        },
 834        .probe    = ds2780_battery_probe,
 835        .remove   = ds2780_battery_remove,
 836};
 837
 838static int __init ds2780_battery_init(void)
 839{
 840        return platform_driver_register(&ds2780_battery_driver);
 841}
 842
 843static void __exit ds2780_battery_exit(void)
 844{
 845        platform_driver_unregister(&ds2780_battery_driver);
 846}
 847
 848module_init(ds2780_battery_init);
 849module_exit(ds2780_battery_exit);
 850
 851MODULE_LICENSE("GPL");
 852MODULE_AUTHOR("Clifton Barnes <cabarnes@indesign-llc.com>");
 853MODULE_DESCRIPTION("Maxim/Dallas DS2780 Stand-Alone Fuel Gauage IC driver");
 854