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 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 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         return w1_ds2780_io(dev_info->w1_dev, buf, addr, count, io);
  68 }
  69
  70 static inline int ds2780_read8(struct ds2780_device_info *dev_info, u8 *val,
  71         int addr)
  72 {
  73         return ds2780_battery_io(dev_info, val, addr, sizeof(u8), 0);
  74 }
  75
  76 static int ds2780_read16(struct ds2780_device_info *dev_info, s16 *val,
  77         int addr)
  78 {
  79         int ret;
  80         u8 raw[2];
  81
  82         ret = ds2780_battery_io(dev_info, raw, addr, sizeof(raw), 0);
  83         if (ret < 0)
  84                 return ret;
  85
  86         *val = (raw[0] << 8) | raw[1];
  87
  88         return 0;
  89 }
  90
  91 static inline int ds2780_read_block(struct ds2780_device_info *dev_info,
  92         u8 *val, int addr, size_t count)
  93 {
  94         return ds2780_battery_io(dev_info, val, addr, count, 0);
  95 }
  96
  97 static inline int ds2780_write(struct ds2780_device_info *dev_info, u8 *val,
  98         int addr, size_t count)
  99 {
 100         return ds2780_battery_io(dev_info, val, addr, count, 1);
 101 }
 102
 103 static inline int ds2780_store_eeprom(struct device *dev, int addr)
 104 {
 105         return w1_ds2780_eeprom_cmd(dev, addr, W1_DS2780_COPY_DATA);
 106 }
 107
 108 static inline int ds2780_recall_eeprom(struct device *dev, int addr)
 109 {
 110         return w1_ds2780_eeprom_cmd(dev, addr, W1_DS2780_RECALL_DATA);
 111 }
 112
 113 static int ds2780_save_eeprom(struct ds2780_device_info *dev_info, int reg)
 114 {
 115         int ret;
 116
 117         ret = ds2780_store_eeprom(dev_info->w1_dev, reg);
 118         if (ret < 0)
 119                 return ret;
 120
 121         ret = ds2780_recall_eeprom(dev_info->w1_dev, reg);
 122         if (ret < 0)
 123                 return ret;
 124
 125         return 0;
 126 }
 127
 128 /* Set sense resistor value in mhos */
 129 static int ds2780_set_sense_register(struct ds2780_device_info *dev_info,
 130         u8 conductance)
 131 {
 132         int ret;
 133
 134         ret = ds2780_write(dev_info, &conductance,
 135                                 DS2780_RSNSP_REG, sizeof(u8));
 136         if (ret < 0)
 137                 return ret;
 138
 139         return ds2780_save_eeprom(dev_info, DS2780_RSNSP_REG);
 140 }
 141
 142 /* Get RSGAIN value from 0 to 1.999 in steps of 0.001 */
 143 static int ds2780_get_rsgain_register(struct ds2780_device_info *dev_info,
 144         u16 *rsgain)
 145 {
 146         return ds2780_read16(dev_info, rsgain, DS2780_RSGAIN_MSB_REG);
 147 }
 148
 149 /* Set RSGAIN value from 0 to 1.999 in steps of 0.001 */
 150 static int ds2780_set_rsgain_register(struct ds2780_device_info *dev_info,
 151         u16 rsgain)
 152 {
 153         int ret;
 154         u8 raw[] = {rsgain >> 8, rsgain & 0xFF};
 155
 156         ret = ds2780_write(dev_info, raw,
 157                                 DS2780_RSGAIN_MSB_REG, sizeof(raw));
 158         if (ret < 0)
 159                 return ret;
 160
 161         return ds2780_save_eeprom(dev_info, DS2780_RSGAIN_MSB_REG);
 162 }
 163
 164 static int ds2780_get_voltage(struct ds2780_device_info *dev_info,
 165         int *voltage_uV)
 166 {
 167         int ret;
 168         s16 voltage_raw;
 169
 170         /*
 171          * The voltage value is located in 10 bits across the voltage MSB
 172          * and LSB registers in two's compliment form
 173          * Sign bit of the voltage value is in bit 7 of the voltage MSB register
 174          * Bits 9 - 3 of the voltage value are in bits 6 - 0 of the
 175          * voltage MSB register
 176          * Bits 2 - 0 of the voltage value are in bits 7 - 5 of the
 177          * voltage LSB register
 178          */
 179         ret = ds2780_read16(dev_info, &voltage_raw,
 180                                 DS2780_VOLT_MSB_REG);
 181         if (ret < 0)
 182                 return ret;
 183
 184         /*
 185          * DS2780 reports voltage in units of 4.88mV, but the battery class
 186          * reports in units of uV, so convert by multiplying by 4880.
 187          */
 188         *voltage_uV = (voltage_raw / 32) * 4880;
 189         return 0;
 190 }
 191
 192 static int ds2780_get_temperature(struct ds2780_device_info *dev_info,
 193         int *temperature)
 194 {
 195         int ret;
 196         s16 temperature_raw;
 197
 198         /*
 199          * The temperature value is located in 10 bits across the temperature
 200          * MSB and LSB registers in two's compliment form
 201          * Sign bit of the temperature value is in bit 7 of the temperature
 202          * MSB register
 203          * Bits 9 - 3 of the temperature value are in bits 6 - 0 of the
 204          * temperature MSB register
 205          * Bits 2 - 0 of the temperature value are in bits 7 - 5 of the
 206          * temperature LSB register
 207          */
 208         ret = ds2780_read16(dev_info, &temperature_raw,
 209                                 DS2780_TEMP_MSB_REG);
 210         if (ret < 0)
 211                 return ret;
 212
 213         /*
 214          * Temperature is measured in units of 0.125 degrees celcius, the
 215          * power_supply class measures temperature in tenths of degrees
 216          * celsius. The temperature value is stored as a 10 bit number, plus
 217          * sign in the upper bits of a 16 bit register.
 218          */
 219         *temperature = ((temperature_raw / 32) * 125) / 100;
 220         return 0;
 221 }
 222
 223 static int ds2780_get_current(struct ds2780_device_info *dev_info,
 224         enum current_types type, int *current_uA)
 225 {
 226         int ret, sense_res;
 227         s16 current_raw;
 228         u8 sense_res_raw, reg_msb;
 229
 230         /*
 231          * The units of measurement for current are dependent on the value of
 232          * the sense resistor.
 233          */
 234         ret = ds2780_read8(dev_info, &sense_res_raw, DS2780_RSNSP_REG);
 235         if (ret < 0)
 236                 return ret;
 237
 238         if (sense_res_raw == 0) {
 239                 dev_err(dev_info->dev, "sense resistor value is 0\n");
 240                 return -EINVAL;
 241         }
 242         sense_res = 1000 / sense_res_raw;
 243
 244         if (type == CURRENT_NOW)
 245                 reg_msb = DS2780_CURRENT_MSB_REG;
 246         else if (type == CURRENT_AVG)
 247                 reg_msb = DS2780_IAVG_MSB_REG;
 248         else
 249                 return -EINVAL;
 250
 251         /*
 252          * The current value is located in 16 bits across the current MSB
 253          * and LSB registers in two's compliment form
 254          * Sign bit of the current value is in bit 7 of the current MSB register
 255          * Bits 14 - 8 of the current value are in bits 6 - 0 of the current
 256          * MSB register
 257          * Bits 7 - 0 of the current value are in bits 7 - 0 of the current
 258          * LSB register
 259          */
 260         ret = ds2780_read16(dev_info, &current_raw, reg_msb);
 261         if (ret < 0)
 262                 return ret;
 263
 264         *current_uA = current_raw * (DS2780_CURRENT_UNITS / sense_res);
 265         return 0;
 266 }
 267
 268 static int ds2780_get_accumulated_current(struct ds2780_device_info *dev_info,
 269         int *accumulated_current)
 270 {
 271         int ret, sense_res;
 272         s16 current_raw;
 273         u8 sense_res_raw;
 274
 275         /*
 276          * The units of measurement for accumulated current are dependent on
 277          * the value of the sense resistor.
 278          */
 279         ret = ds2780_read8(dev_info, &sense_res_raw, DS2780_RSNSP_REG);
 280         if (ret < 0)
 281                 return ret;
 282
 283         if (sense_res_raw == 0) {
 284                 dev_err(dev_info->dev, "sense resistor value is 0\n");
 285                 return -ENXIO;
 286         }
 287         sense_res = 1000 / sense_res_raw;
 288
 289         /*
 290          * The ACR value is located in 16 bits across the ACR MSB and
 291          * LSB registers
 292          * Bits 15 - 8 of the ACR value are in bits 7 - 0 of the ACR
 293          * MSB register
 294          * Bits 7 - 0 of the ACR value are in bits 7 - 0 of the ACR
 295          * LSB register
 296          */
 297         ret = ds2780_read16(dev_info, &current_raw, DS2780_ACR_MSB_REG);
 298         if (ret < 0)
 299                 return ret;
 300
 301         *accumulated_current = current_raw * (DS2780_CHARGE_UNITS / sense_res);
 302         return 0;
 303 }
 304
 305 static int ds2780_get_capacity(struct ds2780_device_info *dev_info,
 306         int *capacity)
 307 {
 308         int ret;
 309         u8 raw;
 310
 311         ret = ds2780_read8(dev_info, &raw, DS2780_RARC_REG);
 312         if (ret < 0)
 313                 return ret;
 314
 315         *capacity = raw;
 316         return raw;
 317 }
 318
 319 static int ds2780_get_status(struct ds2780_device_info *dev_info, int *status)
 320 {
 321         int ret, current_uA, capacity;
 322
 323         ret = ds2780_get_current(dev_info, CURRENT_NOW, &current_uA);
 324         if (ret < 0)
 325                 return ret;
 326
 327         ret = ds2780_get_capacity(dev_info, &capacity);
 328         if (ret < 0)
 329                 return ret;
 330
 331         if (capacity == 100)
 332                 *status = POWER_SUPPLY_STATUS_FULL;
 333         else if (current_uA == 0)
 334                 *status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 335         else if (current_uA < 0)
 336                 *status = POWER_SUPPLY_STATUS_DISCHARGING;
 337         else
 338                 *status = POWER_SUPPLY_STATUS_CHARGING;
 339
 340         return 0;
 341 }
 342
 343 static int ds2780_get_charge_now(struct ds2780_device_info *dev_info,
 344         int *charge_now)
 345 {
 346         int ret;
 347         u16 charge_raw;
 348
 349         /*
 350          * The RAAC value is located in 16 bits across the RAAC MSB and
 351          * LSB registers
 352          * Bits 15 - 8 of the RAAC value are in bits 7 - 0 of the RAAC
 353          * MSB register
 354          * Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC
 355          * LSB register
 356          */
 357         ret = ds2780_read16(dev_info, &charge_raw, DS2780_RAAC_MSB_REG);
 358         if (ret < 0)
 359                 return ret;
 360
 361         *charge_now = charge_raw * 1600;
 362         return 0;
 363 }
 364
 365 static int ds2780_get_control_register(struct ds2780_device_info *dev_info,
 366         u8 *control_reg)
 367 {
 368         return ds2780_read8(dev_info, control_reg, DS2780_CONTROL_REG);
 369 }
 370
 371 static int ds2780_set_control_register(struct ds2780_device_info *dev_info,
 372         u8 control_reg)
 373 {
 374         int ret;
 375
 376         ret = ds2780_write(dev_info, &control_reg,
 377                                 DS2780_CONTROL_REG, sizeof(u8));
 378         if (ret < 0)
 379                 return ret;
 380
 381         return ds2780_save_eeprom(dev_info, DS2780_CONTROL_REG);
 382 }
 383
 384 static int ds2780_battery_get_property(struct power_supply *psy,
 385         enum power_supply_property psp,
 386         union power_supply_propval *val)
 387 {
 388         int ret = 0;
 389         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 390
 391         switch (psp) {
 392         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 393                 ret = ds2780_get_voltage(dev_info, &val->intval);
 394                 break;
 395
 396         case POWER_SUPPLY_PROP_TEMP:
 397                 ret = ds2780_get_temperature(dev_info, &val->intval);
 398                 break;
 399
 400         case POWER_SUPPLY_PROP_MODEL_NAME:
 401                 val->strval = model;
 402                 break;
 403
 404         case POWER_SUPPLY_PROP_MANUFACTURER:
 405                 val->strval = manufacturer;
 406                 break;
 407
 408         case POWER_SUPPLY_PROP_CURRENT_NOW:
 409                 ret = ds2780_get_current(dev_info, CURRENT_NOW, &val->intval);
 410                 break;
 411
 412         case POWER_SUPPLY_PROP_CURRENT_AVG:
 413                 ret = ds2780_get_current(dev_info, CURRENT_AVG, &val->intval);
 414                 break;
 415
 416         case POWER_SUPPLY_PROP_STATUS:
 417                 ret = ds2780_get_status(dev_info, &val->intval);
 418                 break;
 419
 420         case POWER_SUPPLY_PROP_CAPACITY:
 421                 ret = ds2780_get_capacity(dev_info, &val->intval);
 422                 break;
 423
 424         case POWER_SUPPLY_PROP_CHARGE_COUNTER:
 425                 ret = ds2780_get_accumulated_current(dev_info, &val->intval);
 426                 break;
 427
 428         case POWER_SUPPLY_PROP_CHARGE_NOW:
 429                 ret = ds2780_get_charge_now(dev_info, &val->intval);
 430                 break;
 431
 432         default:
 433                 ret = -EINVAL;
 434         }
 435
 436         return ret;
 437 }
 438
 439 static enum power_supply_property ds2780_battery_props[] = {
 440         POWER_SUPPLY_PROP_STATUS,
 441         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 442         POWER_SUPPLY_PROP_TEMP,
 443         POWER_SUPPLY_PROP_MODEL_NAME,
 444         POWER_SUPPLY_PROP_MANUFACTURER,
 445         POWER_SUPPLY_PROP_CURRENT_NOW,
 446         POWER_SUPPLY_PROP_CURRENT_AVG,
 447         POWER_SUPPLY_PROP_CAPACITY,
 448         POWER_SUPPLY_PROP_CHARGE_COUNTER,
 449         POWER_SUPPLY_PROP_CHARGE_NOW,
 450 };
 451
 452 static ssize_t ds2780_get_pmod_enabled(struct device *dev,
 453         struct device_attribute *attr,
 454         char *buf)
 455 {
 456         int ret;
 457         u8 control_reg;
 458         struct power_supply *psy = to_power_supply(dev);
 459         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 460
 461         /* Get power mode */
 462         ret = ds2780_get_control_register(dev_info, &control_reg);
 463         if (ret < 0)
 464                 return ret;
 465
 466         return sprintf(buf, "%d\n",
 467                  !!(control_reg & DS2780_CONTROL_REG_PMOD));
 468 }
 469
 470 static ssize_t ds2780_set_pmod_enabled(struct device *dev,
 471         struct device_attribute *attr,
 472         const char *buf,
 473         size_t count)
 474 {
 475         int ret;
 476         u8 control_reg, new_setting;
 477         struct power_supply *psy = to_power_supply(dev);
 478         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 479
 480         /* Set power mode */
 481         ret = ds2780_get_control_register(dev_info, &control_reg);
 482         if (ret < 0)
 483                 return ret;
 484
 485         ret = kstrtou8(buf, 0, &new_setting);
 486         if (ret < 0)
 487                 return ret;
 488
 489         if ((new_setting != 0) && (new_setting != 1)) {
 490                 dev_err(dev_info->dev, "Invalid pmod setting (0 or 1)\n");
 491                 return -EINVAL;
 492         }
 493
 494         if (new_setting)
 495                 control_reg |= DS2780_CONTROL_REG_PMOD;
 496         else
 497                 control_reg &= ~DS2780_CONTROL_REG_PMOD;
 498
 499         ret = ds2780_set_control_register(dev_info, control_reg);
 500         if (ret < 0)
 501                 return ret;
 502
 503         return count;
 504 }
 505
 506 static ssize_t ds2780_get_sense_resistor_value(struct device *dev,
 507         struct device_attribute *attr,
 508         char *buf)
 509 {
 510         int ret;
 511         u8 sense_resistor;
 512         struct power_supply *psy = to_power_supply(dev);
 513         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 514
 515         ret = ds2780_read8(dev_info, &sense_resistor, DS2780_RSNSP_REG);
 516         if (ret < 0)
 517                 return ret;
 518
 519         ret = sprintf(buf, "%d\n", sense_resistor);
 520         return ret;
 521 }
 522
 523 static ssize_t ds2780_set_sense_resistor_value(struct device *dev,
 524         struct device_attribute *attr,
 525         const char *buf,
 526         size_t count)
 527 {
 528         int ret;
 529         u8 new_setting;
 530         struct power_supply *psy = to_power_supply(dev);
 531         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 532
 533         ret = kstrtou8(buf, 0, &new_setting);
 534         if (ret < 0)
 535                 return ret;
 536
 537         ret = ds2780_set_sense_register(dev_info, new_setting);
 538         if (ret < 0)
 539                 return ret;
 540
 541         return count;
 542 }
 543
 544 static ssize_t ds2780_get_rsgain_setting(struct device *dev,
 545         struct device_attribute *attr,
 546         char *buf)
 547 {
 548         int ret;
 549         u16 rsgain;
 550         struct power_supply *psy = to_power_supply(dev);
 551         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 552
 553         ret = ds2780_get_rsgain_register(dev_info, &rsgain);
 554         if (ret < 0)
 555                 return ret;
 556
 557         return sprintf(buf, "%d\n", rsgain);
 558 }
 559
 560 static ssize_t ds2780_set_rsgain_setting(struct device *dev,
 561         struct device_attribute *attr,
 562         const char *buf,
 563         size_t count)
 564 {
 565         int ret;
 566         u16 new_setting;
 567         struct power_supply *psy = to_power_supply(dev);
 568         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 569
 570         ret = kstrtou16(buf, 0, &new_setting);
 571         if (ret < 0)
 572                 return ret;
 573
 574         /* Gain can only be from 0 to 1.999 in steps of .001 */
 575         if (new_setting > 1999) {
 576                 dev_err(dev_info->dev, "Invalid rsgain setting (0 - 1999)\n");
 577                 return -EINVAL;
 578         }
 579
 580         ret = ds2780_set_rsgain_register(dev_info, new_setting);
 581         if (ret < 0)
 582                 return ret;
 583
 584         return count;
 585 }
 586
 587 static ssize_t ds2780_get_pio_pin(struct device *dev,
 588         struct device_attribute *attr,
 589         char *buf)
 590 {
 591         int ret;
 592         u8 sfr;
 593         struct power_supply *psy = to_power_supply(dev);
 594         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 595
 596         ret = ds2780_read8(dev_info, &sfr, DS2780_SFR_REG);
 597         if (ret < 0)
 598                 return ret;
 599
 600         ret = sprintf(buf, "%d\n", sfr & DS2780_SFR_REG_PIOSC);
 601         return ret;
 602 }
 603
 604 static ssize_t ds2780_set_pio_pin(struct device *dev,
 605         struct device_attribute *attr,
 606         const char *buf,
 607         size_t count)
 608 {
 609         int ret;
 610         u8 new_setting;
 611         struct power_supply *psy = to_power_supply(dev);
 612         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 613
 614         ret = kstrtou8(buf, 0, &new_setting);
 615         if (ret < 0)
 616                 return ret;
 617
 618         if ((new_setting != 0) && (new_setting != 1)) {
 619                 dev_err(dev_info->dev, "Invalid pio_pin setting (0 or 1)\n");
 620                 return -EINVAL;
 621         }
 622
 623         ret = ds2780_write(dev_info, &new_setting,
 624                                 DS2780_SFR_REG, sizeof(u8));
 625         if (ret < 0)
 626                 return ret;
 627
 628         return count;
 629 }
 630
 631 static ssize_t ds2780_read_param_eeprom_bin(struct file *filp,
 632                                 struct kobject *kobj,
 633                                 struct bin_attribute *bin_attr,
 634                                 char *buf, loff_t off, size_t count)
 635 {
 636         struct device *dev = container_of(kobj, struct device, kobj);
 637         struct power_supply *psy = to_power_supply(dev);
 638         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 639
 640         count = min_t(loff_t, count,
 641                 DS2780_EEPROM_BLOCK1_END -
 642                 DS2780_EEPROM_BLOCK1_START + 1 - off);
 643
 644         return ds2780_read_block(dev_info, buf,
 645                                 DS2780_EEPROM_BLOCK1_START + off, count);
 646 }
 647
 648 static ssize_t ds2780_write_param_eeprom_bin(struct file *filp,
 649                                 struct kobject *kobj,
 650                                 struct bin_attribute *bin_attr,
 651                                 char *buf, loff_t off, size_t count)
 652 {
 653         struct device *dev = container_of(kobj, struct device, kobj);
 654         struct power_supply *psy = to_power_supply(dev);
 655         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 656         int ret;
 657
 658         count = min_t(loff_t, count,
 659                 DS2780_EEPROM_BLOCK1_END -
 660                 DS2780_EEPROM_BLOCK1_START + 1 - off);
 661
 662         ret = ds2780_write(dev_info, buf,
 663                                 DS2780_EEPROM_BLOCK1_START + off, count);
 664         if (ret < 0)
 665                 return ret;
 666
 667         ret = ds2780_save_eeprom(dev_info, DS2780_EEPROM_BLOCK1_START);
 668         if (ret < 0)
 669                 return ret;
 670
 671         return count;
 672 }
 673
 674 static struct bin_attribute ds2780_param_eeprom_bin_attr = {
 675         .attr = {
 676                 .name = "param_eeprom",
 677                 .mode = S_IRUGO | S_IWUSR,
 678         },
 679         .size = DS2780_EEPROM_BLOCK1_END - DS2780_EEPROM_BLOCK1_START + 1,
 680         .read = ds2780_read_param_eeprom_bin,
 681         .write = ds2780_write_param_eeprom_bin,
 682 };
 683
 684 static ssize_t ds2780_read_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
 693         count = min_t(loff_t, count,
 694                 DS2780_EEPROM_BLOCK0_END -
 695                 DS2780_EEPROM_BLOCK0_START + 1 - off);
 696
 697         return ds2780_read_block(dev_info, buf,
 698                                 DS2780_EEPROM_BLOCK0_START + off, count);
 699 }
 700
 701 static ssize_t ds2780_write_user_eeprom_bin(struct file *filp,
 702                                 struct kobject *kobj,
 703                                 struct bin_attribute *bin_attr,
 704                                 char *buf, loff_t off, size_t count)
 705 {
 706         struct device *dev = container_of(kobj, struct device, kobj);
 707         struct power_supply *psy = to_power_supply(dev);
 708         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 709         int ret;
 710
 711         count = min_t(loff_t, count,
 712                 DS2780_EEPROM_BLOCK0_END -
 713                 DS2780_EEPROM_BLOCK0_START + 1 - off);
 714
 715         ret = ds2780_write(dev_info, buf,
 716                                 DS2780_EEPROM_BLOCK0_START + off, count);
 717         if (ret < 0)
 718                 return ret;
 719
 720         ret = ds2780_save_eeprom(dev_info, DS2780_EEPROM_BLOCK0_START);
 721         if (ret < 0)
 722                 return ret;
 723
 724         return count;
 725 }
 726
 727 static struct bin_attribute ds2780_user_eeprom_bin_attr = {
 728         .attr = {
 729                 .name = "user_eeprom",
 730                 .mode = S_IRUGO | S_IWUSR,
 731         },
 732         .size = DS2780_EEPROM_BLOCK0_END - DS2780_EEPROM_BLOCK0_START + 1,
 733         .read = ds2780_read_user_eeprom_bin,
 734         .write = ds2780_write_user_eeprom_bin,
 735 };
 736
 737 static DEVICE_ATTR(pmod_enabled, S_IRUGO | S_IWUSR, ds2780_get_pmod_enabled,
 738         ds2780_set_pmod_enabled);
 739 static DEVICE_ATTR(sense_resistor_value, S_IRUGO | S_IWUSR,
 740         ds2780_get_sense_resistor_value, ds2780_set_sense_resistor_value);
 741 static DEVICE_ATTR(rsgain_setting, S_IRUGO | S_IWUSR, ds2780_get_rsgain_setting,
 742         ds2780_set_rsgain_setting);
 743 static DEVICE_ATTR(pio_pin, S_IRUGO | S_IWUSR, ds2780_get_pio_pin,
 744         ds2780_set_pio_pin);
 745
 746
 747 static struct attribute *ds2780_attributes[] = {
 748         &dev_attr_pmod_enabled.attr,
 749         &dev_attr_sense_resistor_value.attr,
 750         &dev_attr_rsgain_setting.attr,
 751         &dev_attr_pio_pin.attr,
 752         NULL
 753 };
 754
 755 static const struct attribute_group ds2780_attr_group = {
 756         .attrs = ds2780_attributes,
 757 };
 758
 759 static int ds2780_battery_probe(struct platform_device *pdev)
 760 {
 761         struct power_supply_config psy_cfg = {};
 762         int ret = 0;
 763         struct ds2780_device_info *dev_info;
 764
 765         dev_info = devm_kzalloc(&pdev->dev, sizeof(*dev_info), GFP_KERNEL);
 766         if (!dev_info) {
 767                 ret = -ENOMEM;
 768                 goto fail;
 769         }
 770
 771         platform_set_drvdata(pdev, dev_info);
 772
 773         dev_info->dev                   = &pdev->dev;
 774         dev_info->w1_dev                = pdev->dev.parent;
 775         dev_info->bat_desc.name         = dev_name(&pdev->dev);
 776         dev_info->bat_desc.type         = POWER_SUPPLY_TYPE_BATTERY;
 777         dev_info->bat_desc.properties   = ds2780_battery_props;
 778         dev_info->bat_desc.num_properties = ARRAY_SIZE(ds2780_battery_props);
 779         dev_info->bat_desc.get_property = ds2780_battery_get_property;
 780
 781         psy_cfg.drv_data                = dev_info;
 782
 783         dev_info->bat = power_supply_register(&pdev->dev, &dev_info->bat_desc,
 784                                               &psy_cfg);
 785         if (IS_ERR(dev_info->bat)) {
 786                 dev_err(dev_info->dev, "failed to register battery\n");
 787                 ret = PTR_ERR(dev_info->bat);
 788                 goto fail;
 789         }
 790
 791         ret = sysfs_create_group(&dev_info->bat->dev.kobj, &ds2780_attr_group);
 792         if (ret) {
 793                 dev_err(dev_info->dev, "failed to create sysfs group\n");
 794                 goto fail_unregister;
 795         }
 796
 797         ret = sysfs_create_bin_file(&dev_info->bat->dev.kobj,
 798                                         &ds2780_param_eeprom_bin_attr);
 799         if (ret) {
 800                 dev_err(dev_info->dev,
 801                                 "failed to create param eeprom bin file");
 802                 goto fail_remove_group;
 803         }
 804
 805         ret = sysfs_create_bin_file(&dev_info->bat->dev.kobj,
 806                                         &ds2780_user_eeprom_bin_attr);
 807         if (ret) {
 808                 dev_err(dev_info->dev,
 809                                 "failed to create user eeprom bin file");
 810                 goto fail_remove_bin_file;
 811         }
 812
 813         return 0;
 814
 815 fail_remove_bin_file:
 816         sysfs_remove_bin_file(&dev_info->bat->dev.kobj,
 817                                 &ds2780_param_eeprom_bin_attr);
 818 fail_remove_group:
 819         sysfs_remove_group(&dev_info->bat->dev.kobj, &ds2780_attr_group);
 820 fail_unregister:
 821         power_supply_unregister(dev_info->bat);
 822 fail:
 823         return ret;
 824 }
 825
 826 static int ds2780_battery_remove(struct platform_device *pdev)
 827 {
 828         struct ds2780_device_info *dev_info = platform_get_drvdata(pdev);
 829
 830         /*
 831          * Remove attributes before unregistering power supply
 832          * because 'bat' will be freed on power_supply_unregister() call.
 833          */
 834         sysfs_remove_group(&dev_info->bat->dev.kobj, &ds2780_attr_group);
 835
 836         power_supply_unregister(dev_info->bat);
 837
 838         return 0;
 839 }
 840
 841 static struct platform_driver ds2780_battery_driver = {
 842         .driver = {
 843                 .name = "ds2780-battery",
 844         },
 845         .probe    = ds2780_battery_probe,
 846         .remove   = ds2780_battery_remove,
 847 };
 848
 849 module_platform_driver(ds2780_battery_driver);
 850
 851 MODULE_LICENSE("GPL");
 852 MODULE_AUTHOR("Clifton Barnes <cabarnes@indesign-llc.com>");
 853 MODULE_DESCRIPTION("Maxim/Dallas DS2780 Stand-Alone Fuel Gauage IC driver");
 854 MODULE_ALIAS("platform:ds2780-battery");