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 };
  43
  44 enum current_types {
  45         CURRENT_NOW,
  46         CURRENT_AVG,
  47 };
  48
  49 static const char model[] = "DS2780";
  50 static const char manufacturer[] = "Maxim/Dallas";
  51
  52 static inline struct ds2780_device_info *
  53 to_ds2780_device_info(struct power_supply *psy)
  54 {
  55         return container_of(psy, struct ds2780_device_info, bat);
  56 }
  57
  58 static inline struct power_supply *to_power_supply(struct device *dev)
  59 {
  60         return dev_get_drvdata(dev);
  61 }
  62
  63 static inline int ds2780_battery_io(struct ds2780_device_info *dev_info,
  64         char *buf, int addr, size_t count, int io)
  65 {
  66         return w1_ds2780_io(dev_info->w1_dev, buf, addr, count, io);
  67 }
  68
  69 static inline int ds2780_read8(struct ds2780_device_info *dev_info, u8 *val,
  70         int addr)
  71 {
  72         return ds2780_battery_io(dev_info, val, addr, sizeof(u8), 0);
  73 }
  74
  75 static int ds2780_read16(struct ds2780_device_info *dev_info, s16 *val,
  76         int addr)
  77 {
  78         int ret;
  79         u8 raw[2];
  80
  81         ret = ds2780_battery_io(dev_info, raw, addr, sizeof(raw), 0);
  82         if (ret < 0)
  83                 return ret;
  84
  85         *val = (raw[0] << 8) | raw[1];
  86
  87         return 0;
  88 }
  89
  90 static inline int ds2780_read_block(struct ds2780_device_info *dev_info,
  91         u8 *val, int addr, size_t count)
  92 {
  93         return ds2780_battery_io(dev_info, val, addr, count, 0);
  94 }
  95
  96 static inline int ds2780_write(struct ds2780_device_info *dev_info, u8 *val,
  97         int addr, size_t count)
  98 {
  99         return ds2780_battery_io(dev_info, val, addr, count, 1);
 100 }
 101
 102 static inline int ds2780_store_eeprom(struct device *dev, int addr)
 103 {
 104         return w1_ds2780_eeprom_cmd(dev, addr, W1_DS2780_COPY_DATA);
 105 }
 106
 107 static inline int ds2780_recall_eeprom(struct device *dev, int addr)
 108 {
 109         return w1_ds2780_eeprom_cmd(dev, addr, W1_DS2780_RECALL_DATA);
 110 }
 111
 112 static int ds2780_save_eeprom(struct ds2780_device_info *dev_info, int reg)
 113 {
 114         int ret;
 115
 116         ret = ds2780_store_eeprom(dev_info->w1_dev, reg);
 117         if (ret < 0)
 118                 return ret;
 119
 120         ret = ds2780_recall_eeprom(dev_info->w1_dev, reg);
 121         if (ret < 0)
 122                 return ret;
 123
 124         return 0;
 125 }
 126
 127 /* Set sense resistor value in mhos */
 128 static int ds2780_set_sense_register(struct ds2780_device_info *dev_info,
 129         u8 conductance)
 130 {
 131         int ret;
 132
 133         ret = ds2780_write(dev_info, &conductance,
 134                                 DS2780_RSNSP_REG, sizeof(u8));
 135         if (ret < 0)
 136                 return ret;
 137
 138         return ds2780_save_eeprom(dev_info, DS2780_RSNSP_REG);
 139 }
 140
 141 /* Get RSGAIN value from 0 to 1.999 in steps of 0.001 */
 142 static int ds2780_get_rsgain_register(struct ds2780_device_info *dev_info,
 143         u16 *rsgain)
 144 {
 145         return ds2780_read16(dev_info, rsgain, DS2780_RSGAIN_MSB_REG);
 146 }
 147
 148 /* Set RSGAIN value from 0 to 1.999 in steps of 0.001 */
 149 static int ds2780_set_rsgain_register(struct ds2780_device_info *dev_info,
 150         u16 rsgain)
 151 {
 152         int ret;
 153         u8 raw[] = {rsgain >> 8, rsgain & 0xFF};
 154
 155         ret = ds2780_write(dev_info, raw,
 156                                 DS2780_RSGAIN_MSB_REG, sizeof(raw));
 157         if (ret < 0)
 158                 return ret;
 159
 160         return ds2780_save_eeprom(dev_info, DS2780_RSGAIN_MSB_REG);
 161 }
 162
 163 static int ds2780_get_voltage(struct ds2780_device_info *dev_info,
 164         int *voltage_uV)
 165 {
 166         int ret;
 167         s16 voltage_raw;
 168
 169         /*
 170          * The voltage value is located in 10 bits across the voltage MSB
 171          * and LSB registers in two's compliment 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         ret = ds2780_read16(dev_info, &voltage_raw,
 179                                 DS2780_VOLT_MSB_REG);
 180         if (ret < 0)
 181                 return ret;
 182
 183         /*
 184          * DS2780 reports voltage in units of 4.88mV, but the battery class
 185          * reports in units of uV, so convert by multiplying by 4880.
 186          */
 187         *voltage_uV = (voltage_raw / 32) * 4880;
 188         return 0;
 189 }
 190
 191 static int ds2780_get_temperature(struct ds2780_device_info *dev_info,
 192         int *temperature)
 193 {
 194         int ret;
 195         s16 temperature_raw;
 196
 197         /*
 198          * The temperature value is located in 10 bits across the temperature
 199          * MSB and LSB registers in two's compliment form
 200          * Sign bit of the temperature value is in bit 7 of the temperature
 201          * MSB register
 202          * Bits 9 - 3 of the temperature value are in bits 6 - 0 of the
 203          * temperature MSB register
 204          * Bits 2 - 0 of the temperature value are in bits 7 - 5 of the
 205          * temperature LSB register
 206          */
 207         ret = ds2780_read16(dev_info, &temperature_raw,
 208                                 DS2780_TEMP_MSB_REG);
 209         if (ret < 0)
 210                 return ret;
 211
 212         /*
 213          * Temperature is measured in units of 0.125 degrees celcius, the
 214          * power_supply class measures temperature in tenths of degrees
 215          * celsius. The temperature value is stored as a 10 bit number, plus
 216          * sign in the upper bits of a 16 bit register.
 217          */
 218         *temperature = ((temperature_raw / 32) * 125) / 100;
 219         return 0;
 220 }
 221
 222 static int ds2780_get_current(struct ds2780_device_info *dev_info,
 223         enum current_types type, int *current_uA)
 224 {
 225         int ret, sense_res;
 226         s16 current_raw;
 227         u8 sense_res_raw, reg_msb;
 228
 229         /*
 230          * The units of measurement for current are dependent on the value of
 231          * the sense resistor.
 232          */
 233         ret = ds2780_read8(dev_info, &sense_res_raw, DS2780_RSNSP_REG);
 234         if (ret < 0)
 235                 return ret;
 236
 237         if (sense_res_raw == 0) {
 238                 dev_err(dev_info->dev, "sense resistor value is 0\n");
 239                 return -EINVAL;
 240         }
 241         sense_res = 1000 / sense_res_raw;
 242
 243         if (type == CURRENT_NOW)
 244                 reg_msb = DS2780_CURRENT_MSB_REG;
 245         else if (type == CURRENT_AVG)
 246                 reg_msb = DS2780_IAVG_MSB_REG;
 247         else
 248                 return -EINVAL;
 249
 250         /*
 251          * The current value is located in 16 bits across the current MSB
 252          * and LSB registers in two's compliment form
 253          * Sign bit of the current value is in bit 7 of the current MSB register
 254          * Bits 14 - 8 of the current value are in bits 6 - 0 of the current
 255          * MSB register
 256          * Bits 7 - 0 of the current value are in bits 7 - 0 of the current
 257          * LSB register
 258          */
 259         ret = ds2780_read16(dev_info, &current_raw, reg_msb);
 260         if (ret < 0)
 261                 return ret;
 262
 263         *current_uA = current_raw * (DS2780_CURRENT_UNITS / sense_res);
 264         return 0;
 265 }
 266
 267 static int ds2780_get_accumulated_current(struct ds2780_device_info *dev_info,
 268         int *accumulated_current)
 269 {
 270         int ret, sense_res;
 271         s16 current_raw;
 272         u8 sense_res_raw;
 273
 274         /*
 275          * The units of measurement for accumulated current are dependent on
 276          * the value of the sense resistor.
 277          */
 278         ret = ds2780_read8(dev_info, &sense_res_raw, DS2780_RSNSP_REG);
 279         if (ret < 0)
 280                 return ret;
 281
 282         if (sense_res_raw == 0) {
 283                 dev_err(dev_info->dev, "sense resistor value is 0\n");
 284                 return -ENXIO;
 285         }
 286         sense_res = 1000 / sense_res_raw;
 287
 288         /*
 289          * The ACR value is located in 16 bits across the ACR MSB and
 290          * LSB registers
 291          * Bits 15 - 8 of the ACR value are in bits 7 - 0 of the ACR
 292          * MSB register
 293          * Bits 7 - 0 of the ACR value are in bits 7 - 0 of the ACR
 294          * LSB register
 295          */
 296         ret = ds2780_read16(dev_info, &current_raw, DS2780_ACR_MSB_REG);
 297         if (ret < 0)
 298                 return ret;
 299
 300         *accumulated_current = current_raw * (DS2780_CHARGE_UNITS / sense_res);
 301         return 0;
 302 }
 303
 304 static int ds2780_get_capacity(struct ds2780_device_info *dev_info,
 305         int *capacity)
 306 {
 307         int ret;
 308         u8 raw;
 309
 310         ret = ds2780_read8(dev_info, &raw, DS2780_RARC_REG);
 311         if (ret < 0)
 312                 return ret;
 313
 314         *capacity = raw;
 315         return raw;
 316 }
 317
 318 static int ds2780_get_status(struct ds2780_device_info *dev_info, int *status)
 319 {
 320         int ret, current_uA, capacity;
 321
 322         ret = ds2780_get_current(dev_info, CURRENT_NOW, &current_uA);
 323         if (ret < 0)
 324                 return ret;
 325
 326         ret = ds2780_get_capacity(dev_info, &capacity);
 327         if (ret < 0)
 328                 return ret;
 329
 330         if (capacity == 100)
 331                 *status = POWER_SUPPLY_STATUS_FULL;
 332         else if (current_uA == 0)
 333                 *status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 334         else if (current_uA < 0)
 335                 *status = POWER_SUPPLY_STATUS_DISCHARGING;
 336         else
 337                 *status = POWER_SUPPLY_STATUS_CHARGING;
 338
 339         return 0;
 340 }
 341
 342 static int ds2780_get_charge_now(struct ds2780_device_info *dev_info,
 343         int *charge_now)
 344 {
 345         int ret;
 346         u16 charge_raw;
 347
 348         /*
 349          * The RAAC value is located in 16 bits across the RAAC MSB and
 350          * LSB registers
 351          * Bits 15 - 8 of the RAAC value are in bits 7 - 0 of the RAAC
 352          * MSB register
 353          * Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC
 354          * LSB register
 355          */
 356         ret = ds2780_read16(dev_info, &charge_raw, DS2780_RAAC_MSB_REG);
 357         if (ret < 0)
 358                 return ret;
 359
 360         *charge_now = charge_raw * 1600;
 361         return 0;
 362 }
 363
 364 static int ds2780_get_control_register(struct ds2780_device_info *dev_info,
 365         u8 *control_reg)
 366 {
 367         return ds2780_read8(dev_info, control_reg, DS2780_CONTROL_REG);
 368 }
 369
 370 static int ds2780_set_control_register(struct ds2780_device_info *dev_info,
 371         u8 control_reg)
 372 {
 373         int ret;
 374
 375         ret = ds2780_write(dev_info, &control_reg,
 376                                 DS2780_CONTROL_REG, sizeof(u8));
 377         if (ret < 0)
 378                 return ret;
 379
 380         return ds2780_save_eeprom(dev_info, DS2780_CONTROL_REG);
 381 }
 382
 383 static int ds2780_battery_get_property(struct power_supply *psy,
 384         enum power_supply_property psp,
 385         union power_supply_propval *val)
 386 {
 387         int ret = 0;
 388         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 389
 390         switch (psp) {
 391         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 392                 ret = ds2780_get_voltage(dev_info, &val->intval);
 393                 break;
 394
 395         case POWER_SUPPLY_PROP_TEMP:
 396                 ret = ds2780_get_temperature(dev_info, &val->intval);
 397                 break;
 398
 399         case POWER_SUPPLY_PROP_MODEL_NAME:
 400                 val->strval = model;
 401                 break;
 402
 403         case POWER_SUPPLY_PROP_MANUFACTURER:
 404                 val->strval = manufacturer;
 405                 break;
 406
 407         case POWER_SUPPLY_PROP_CURRENT_NOW:
 408                 ret = ds2780_get_current(dev_info, CURRENT_NOW, &val->intval);
 409                 break;
 410
 411         case POWER_SUPPLY_PROP_CURRENT_AVG:
 412                 ret = ds2780_get_current(dev_info, CURRENT_AVG, &val->intval);
 413                 break;
 414
 415         case POWER_SUPPLY_PROP_STATUS:
 416                 ret = ds2780_get_status(dev_info, &val->intval);
 417                 break;
 418
 419         case POWER_SUPPLY_PROP_CAPACITY:
 420                 ret = ds2780_get_capacity(dev_info, &val->intval);
 421                 break;
 422
 423         case POWER_SUPPLY_PROP_CHARGE_COUNTER:
 424                 ret = ds2780_get_accumulated_current(dev_info, &val->intval);
 425                 break;
 426
 427         case POWER_SUPPLY_PROP_CHARGE_NOW:
 428                 ret = ds2780_get_charge_now(dev_info, &val->intval);
 429                 break;
 430
 431         default:
 432                 ret = -EINVAL;
 433         }
 434
 435         return ret;
 436 }
 437
 438 static enum power_supply_property ds2780_battery_props[] = {
 439         POWER_SUPPLY_PROP_STATUS,
 440         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 441         POWER_SUPPLY_PROP_TEMP,
 442         POWER_SUPPLY_PROP_MODEL_NAME,
 443         POWER_SUPPLY_PROP_MANUFACTURER,
 444         POWER_SUPPLY_PROP_CURRENT_NOW,
 445         POWER_SUPPLY_PROP_CURRENT_AVG,
 446         POWER_SUPPLY_PROP_CAPACITY,
 447         POWER_SUPPLY_PROP_CHARGE_COUNTER,
 448         POWER_SUPPLY_PROP_CHARGE_NOW,
 449 };
 450
 451 static ssize_t ds2780_get_pmod_enabled(struct device *dev,
 452         struct device_attribute *attr,
 453         char *buf)
 454 {
 455         int ret;
 456         u8 control_reg;
 457         struct power_supply *psy = to_power_supply(dev);
 458         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 459
 460         /* Get power mode */
 461         ret = ds2780_get_control_register(dev_info, &control_reg);
 462         if (ret < 0)
 463                 return ret;
 464
 465         return sprintf(buf, "%d\n",
 466                  !!(control_reg & DS2780_CONTROL_REG_PMOD));
 467 }
 468
 469 static ssize_t ds2780_set_pmod_enabled(struct device *dev,
 470         struct device_attribute *attr,
 471         const char *buf,
 472         size_t count)
 473 {
 474         int ret;
 475         u8 control_reg, new_setting;
 476         struct power_supply *psy = to_power_supply(dev);
 477         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 478
 479         /* Set power mode */
 480         ret = ds2780_get_control_register(dev_info, &control_reg);
 481         if (ret < 0)
 482                 return ret;
 483
 484         ret = kstrtou8(buf, 0, &new_setting);
 485         if (ret < 0)
 486                 return ret;
 487
 488         if ((new_setting != 0) && (new_setting != 1)) {
 489                 dev_err(dev_info->dev, "Invalid pmod setting (0 or 1)\n");
 490                 return -EINVAL;
 491         }
 492
 493         if (new_setting)
 494                 control_reg |= DS2780_CONTROL_REG_PMOD;
 495         else
 496                 control_reg &= ~DS2780_CONTROL_REG_PMOD;
 497
 498         ret = ds2780_set_control_register(dev_info, control_reg);
 499         if (ret < 0)
 500                 return ret;
 501
 502         return count;
 503 }
 504
 505 static ssize_t ds2780_get_sense_resistor_value(struct device *dev,
 506         struct device_attribute *attr,
 507         char *buf)
 508 {
 509         int ret;
 510         u8 sense_resistor;
 511         struct power_supply *psy = to_power_supply(dev);
 512         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 513
 514         ret = ds2780_read8(dev_info, &sense_resistor, DS2780_RSNSP_REG);
 515         if (ret < 0)
 516                 return ret;
 517
 518         ret = sprintf(buf, "%d\n", sense_resistor);
 519         return ret;
 520 }
 521
 522 static ssize_t ds2780_set_sense_resistor_value(struct device *dev,
 523         struct device_attribute *attr,
 524         const char *buf,
 525         size_t count)
 526 {
 527         int ret;
 528         u8 new_setting;
 529         struct power_supply *psy = to_power_supply(dev);
 530         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 531
 532         ret = kstrtou8(buf, 0, &new_setting);
 533         if (ret < 0)
 534                 return ret;
 535
 536         ret = ds2780_set_sense_register(dev_info, new_setting);
 537         if (ret < 0)
 538                 return ret;
 539
 540         return count;
 541 }
 542
 543 static ssize_t ds2780_get_rsgain_setting(struct device *dev,
 544         struct device_attribute *attr,
 545         char *buf)
 546 {
 547         int ret;
 548         u16 rsgain;
 549         struct power_supply *psy = to_power_supply(dev);
 550         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 551
 552         ret = ds2780_get_rsgain_register(dev_info, &rsgain);
 553         if (ret < 0)
 554                 return ret;
 555
 556         return sprintf(buf, "%d\n", rsgain);
 557 }
 558
 559 static ssize_t ds2780_set_rsgain_setting(struct device *dev,
 560         struct device_attribute *attr,
 561         const char *buf,
 562         size_t count)
 563 {
 564         int ret;
 565         u16 new_setting;
 566         struct power_supply *psy = to_power_supply(dev);
 567         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 568
 569         ret = kstrtou16(buf, 0, &new_setting);
 570         if (ret < 0)
 571                 return ret;
 572
 573         /* Gain can only be from 0 to 1.999 in steps of .001 */
 574         if (new_setting > 1999) {
 575                 dev_err(dev_info->dev, "Invalid rsgain setting (0 - 1999)\n");
 576                 return -EINVAL;
 577         }
 578
 579         ret = ds2780_set_rsgain_register(dev_info, new_setting);
 580         if (ret < 0)
 581                 return ret;
 582
 583         return count;
 584 }
 585
 586 static ssize_t ds2780_get_pio_pin(struct device *dev,
 587         struct device_attribute *attr,
 588         char *buf)
 589 {
 590         int ret;
 591         u8 sfr;
 592         struct power_supply *psy = to_power_supply(dev);
 593         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 594
 595         ret = ds2780_read8(dev_info, &sfr, DS2780_SFR_REG);
 596         if (ret < 0)
 597                 return ret;
 598
 599         ret = sprintf(buf, "%d\n", sfr & DS2780_SFR_REG_PIOSC);
 600         return ret;
 601 }
 602
 603 static ssize_t ds2780_set_pio_pin(struct device *dev,
 604         struct device_attribute *attr,
 605         const char *buf,
 606         size_t count)
 607 {
 608         int ret;
 609         u8 new_setting;
 610         struct power_supply *psy = to_power_supply(dev);
 611         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 612
 613         ret = kstrtou8(buf, 0, &new_setting);
 614         if (ret < 0)
 615                 return ret;
 616
 617         if ((new_setting != 0) && (new_setting != 1)) {
 618                 dev_err(dev_info->dev, "Invalid pio_pin setting (0 or 1)\n");
 619                 return -EINVAL;
 620         }
 621
 622         ret = ds2780_write(dev_info, &new_setting,
 623                                 DS2780_SFR_REG, sizeof(u8));
 624         if (ret < 0)
 625                 return ret;
 626
 627         return count;
 628 }
 629
 630 static ssize_t ds2780_read_param_eeprom_bin(struct file *filp,
 631                                 struct kobject *kobj,
 632                                 struct bin_attribute *bin_attr,
 633                                 char *buf, loff_t off, size_t count)
 634 {
 635         struct device *dev = container_of(kobj, struct device, kobj);
 636         struct power_supply *psy = to_power_supply(dev);
 637         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 638
 639         count = min_t(loff_t, count,
 640                 DS2780_EEPROM_BLOCK1_END -
 641                 DS2780_EEPROM_BLOCK1_START + 1 - off);
 642
 643         return ds2780_read_block(dev_info, buf,
 644                                 DS2780_EEPROM_BLOCK1_START + off, count);
 645 }
 646
 647 static ssize_t ds2780_write_param_eeprom_bin(struct file *filp,
 648                                 struct kobject *kobj,
 649                                 struct bin_attribute *bin_attr,
 650                                 char *buf, loff_t off, size_t count)
 651 {
 652         struct device *dev = container_of(kobj, struct device, kobj);
 653         struct power_supply *psy = to_power_supply(dev);
 654         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 655         int ret;
 656
 657         count = min_t(loff_t, count,
 658                 DS2780_EEPROM_BLOCK1_END -
 659                 DS2780_EEPROM_BLOCK1_START + 1 - off);
 660
 661         ret = ds2780_write(dev_info, buf,
 662                                 DS2780_EEPROM_BLOCK1_START + off, count);
 663         if (ret < 0)
 664                 return ret;
 665
 666         ret = ds2780_save_eeprom(dev_info, DS2780_EEPROM_BLOCK1_START);
 667         if (ret < 0)
 668                 return ret;
 669
 670         return count;
 671 }
 672
 673 static struct bin_attribute ds2780_param_eeprom_bin_attr = {
 674         .attr = {
 675                 .name = "param_eeprom",
 676                 .mode = S_IRUGO | S_IWUSR,
 677         },
 678         .size = DS2780_EEPROM_BLOCK1_END - DS2780_EEPROM_BLOCK1_START + 1,
 679         .read = ds2780_read_param_eeprom_bin,
 680         .write = ds2780_write_param_eeprom_bin,
 681 };
 682
 683 static ssize_t ds2780_read_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 ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 691
 692         count = min_t(loff_t, count,
 693                 DS2780_EEPROM_BLOCK0_END -
 694                 DS2780_EEPROM_BLOCK0_START + 1 - off);
 695
 696         return ds2780_read_block(dev_info, buf,
 697                                 DS2780_EEPROM_BLOCK0_START + off, count);
 698 }
 699
 700 static ssize_t ds2780_write_user_eeprom_bin(struct file *filp,
 701                                 struct kobject *kobj,
 702                                 struct bin_attribute *bin_attr,
 703                                 char *buf, loff_t off, size_t count)
 704 {
 705         struct device *dev = container_of(kobj, struct device, kobj);
 706         struct power_supply *psy = to_power_supply(dev);
 707         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 708         int ret;
 709
 710         count = min_t(loff_t, count,
 711                 DS2780_EEPROM_BLOCK0_END -
 712                 DS2780_EEPROM_BLOCK0_START + 1 - off);
 713
 714         ret = ds2780_write(dev_info, buf,
 715                                 DS2780_EEPROM_BLOCK0_START + off, count);
 716         if (ret < 0)
 717                 return ret;
 718
 719         ret = ds2780_save_eeprom(dev_info, DS2780_EEPROM_BLOCK0_START);
 720         if (ret < 0)
 721                 return ret;
 722
 723         return count;
 724 }
 725
 726 static struct bin_attribute ds2780_user_eeprom_bin_attr = {
 727         .attr = {
 728                 .name = "user_eeprom",
 729                 .mode = S_IRUGO | S_IWUSR,
 730         },
 731         .size = DS2780_EEPROM_BLOCK0_END - DS2780_EEPROM_BLOCK0_START + 1,
 732         .read = ds2780_read_user_eeprom_bin,
 733         .write = ds2780_write_user_eeprom_bin,
 734 };
 735
 736 static DEVICE_ATTR(pmod_enabled, S_IRUGO | S_IWUSR, ds2780_get_pmod_enabled,
 737         ds2780_set_pmod_enabled);
 738 static DEVICE_ATTR(sense_resistor_value, S_IRUGO | S_IWUSR,
 739         ds2780_get_sense_resistor_value, ds2780_set_sense_resistor_value);
 740 static DEVICE_ATTR(rsgain_setting, S_IRUGO | S_IWUSR, ds2780_get_rsgain_setting,
 741         ds2780_set_rsgain_setting);
 742 static DEVICE_ATTR(pio_pin, S_IRUGO | S_IWUSR, ds2780_get_pio_pin,
 743         ds2780_set_pio_pin);
 744
 745
 746 static struct attribute *ds2780_attributes[] = {
 747         &dev_attr_pmod_enabled.attr,
 748         &dev_attr_sense_resistor_value.attr,
 749         &dev_attr_rsgain_setting.attr,
 750         &dev_attr_pio_pin.attr,
 751         NULL
 752 };
 753
 754 static const struct attribute_group ds2780_attr_group = {
 755         .attrs = ds2780_attributes,
 756 };
 757
 758 static int ds2780_battery_probe(struct platform_device *pdev)
 759 {
 760         int ret = 0;
 761         struct ds2780_device_info *dev_info;
 762
 763         dev_info = kzalloc(sizeof(*dev_info), GFP_KERNEL);
 764         if (!dev_info) {
 765                 ret = -ENOMEM;
 766                 goto fail;
 767         }
 768
 769         platform_set_drvdata(pdev, dev_info);
 770
 771         dev_info->dev                   = &pdev->dev;
 772         dev_info->w1_dev                = pdev->dev.parent;
 773         dev_info->bat.name              = dev_name(&pdev->dev);
 774         dev_info->bat.type              = POWER_SUPPLY_TYPE_BATTERY;
 775         dev_info->bat.properties        = ds2780_battery_props;
 776         dev_info->bat.num_properties    = ARRAY_SIZE(ds2780_battery_props);
 777         dev_info->bat.get_property      = ds2780_battery_get_property;
 778
 779         ret = power_supply_register(&pdev->dev, &dev_info->bat);
 780         if (ret) {
 781                 dev_err(dev_info->dev, "failed to register battery\n");
 782                 goto fail_free_info;
 783         }
 784
 785         ret = sysfs_create_group(&dev_info->bat.dev->kobj, &ds2780_attr_group);
 786         if (ret) {
 787                 dev_err(dev_info->dev, "failed to create sysfs group\n");
 788                 goto fail_unregister;
 789         }
 790
 791         ret = sysfs_create_bin_file(&dev_info->bat.dev->kobj,
 792                                         &ds2780_param_eeprom_bin_attr);
 793         if (ret) {
 794                 dev_err(dev_info->dev,
 795                                 "failed to create param eeprom bin file");
 796                 goto fail_remove_group;
 797         }
 798
 799         ret = sysfs_create_bin_file(&dev_info->bat.dev->kobj,
 800                                         &ds2780_user_eeprom_bin_attr);
 801         if (ret) {
 802                 dev_err(dev_info->dev,
 803                                 "failed to create user eeprom bin file");
 804                 goto fail_remove_bin_file;
 805         }
 806
 807         return 0;
 808
 809 fail_remove_bin_file:
 810         sysfs_remove_bin_file(&dev_info->bat.dev->kobj,
 811                                 &ds2780_param_eeprom_bin_attr);
 812 fail_remove_group:
 813         sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2780_attr_group);
 814 fail_unregister:
 815         power_supply_unregister(&dev_info->bat);
 816 fail_free_info:
 817         kfree(dev_info);
 818 fail:
 819         return ret;
 820 }
 821
 822 static int ds2780_battery_remove(struct platform_device *pdev)
 823 {
 824         struct ds2780_device_info *dev_info = platform_get_drvdata(pdev);
 825
 826         /* remove attributes */
 827         sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2780_attr_group);
 828
 829         power_supply_unregister(&dev_info->bat);
 830
 831         kfree(dev_info);
 832         return 0;
 833 }
 834
 835 static struct platform_driver ds2780_battery_driver = {
 836         .driver = {
 837                 .name = "ds2780-battery",
 838         },
 839         .probe    = ds2780_battery_probe,
 840         .remove   = ds2780_battery_remove,
 841 };
 842
 843 module_platform_driver(ds2780_battery_driver);
 844
 845 MODULE_LICENSE("GPL");
 846 MODULE_AUTHOR("Clifton Barnes <cabarnes@indesign-llc.com>");
 847 MODULE_DESCRIPTION("Maxim/Dallas DS2780 Stand-Alone Fuel Gauage IC driver");
 848 MODULE_ALIAS("platform:ds2780-battery");