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 *to_ds2780_device_info(
  53         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_read8(struct device *dev, u8 *val, int addr)
  64 {
  65         return w1_ds2780_io(dev, val, addr, sizeof(u8), 0);
  66 }
  67
  68 static 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
  82 static 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
  88 static 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
  94 static 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
  99 static 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
 104 static 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 */
 120 static 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 */
 134 static 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 */
 141 static 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
 155 static 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
 183 static 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
 214 static 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
 259 static 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
 296 static 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
 310 static 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
 334 static 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
 356 static 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
 362 static 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
 375 static 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
 430 static 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
 443 static 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
 461 static 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
 497 static 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
 514 static 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
 535 static 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
 551 static 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
 578 static 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
 595 static 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
 622 static 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
 639 static ssize_t ds2780_write_param_eeprom_bin(struct file *filp,
 640                                 struct kobject *kobj,
 641                                 struct bin_attribute *bin_attr,
 642                                 char *buf, loff_t off, size_t count)
 643 {
 644         struct device *dev = container_of(kobj, struct device, kobj);
 645         struct power_supply *psy = to_power_supply(dev);
 646         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
 647         int ret;
 648
 649         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
 665 static 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
 675 static 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
 693 static 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
 719 static 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
 729 static DEVICE_ATTR(pmod_enabled, S_IRUGO | S_IWUSR, ds2780_get_pmod_enabled,
 730         ds2780_set_pmod_enabled);
 731 static DEVICE_ATTR(sense_resistor_value, S_IRUGO | S_IWUSR,
 732         ds2780_get_sense_resistor_value, ds2780_set_sense_resistor_value);
 733 static DEVICE_ATTR(rsgain_setting, S_IRUGO | S_IWUSR, ds2780_get_rsgain_setting,
 734         ds2780_set_rsgain_setting);
 735 static DEVICE_ATTR(pio_pin, S_IRUGO | S_IWUSR, ds2780_get_pio_pin,
 736         ds2780_set_pio_pin);
 737
 738
 739 static 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
 747 static const struct attribute_group ds2780_attr_group = {
 748         .attrs = ds2780_attributes,
 749 };
 750
 751 static 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
 802 fail_remove_bin_file:
 803         sysfs_remove_bin_file(&dev_info->bat.dev->kobj,
 804                                 &ds2780_param_eeprom_bin_attr);
 805 fail_remove_group:
 806         sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2780_attr_group);
 807 fail_unregister:
 808         power_supply_unregister(&dev_info->bat);
 809 fail_free_info:
 810         kfree(dev_info);
 811 fail:
 812         return ret;
 813 }
 814
 815 static 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
 828 MODULE_ALIAS("platform:ds2780-battery");
 829
 830 static struct platform_driver ds2780_battery_driver = {
 831         .driver = {
 832                 .name = "ds2780-battery",
 833         },
 834         .probe    = ds2780_battery_probe,
 835         .remove   = __devexit_p(ds2780_battery_remove),
 836 };
 837
 838 static int __init ds2780_battery_init(void)
 839 {
 840         return platform_driver_register(&ds2780_battery_driver);
 841 }
 842
 843 static void __exit ds2780_battery_exit(void)
 844 {
 845         platform_driver_unregister(&ds2780_battery_driver);
 846 }
 847
 848 module_init(ds2780_battery_init);
 849 module_exit(ds2780_battery_exit);
 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");