drivers/power/ds2781_battery.c

   1 /*
   2  * 1-wire client/driver for the Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC
   3  *
   4  * Author: Renata Sayakhova <renata@oktetlabs.ru>
   5  *
   6  * Based on ds2780_battery drivers
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/slab.h>
  16 #include <linux/param.h>
  17 #include <linux/pm.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/power_supply.h>
  20 #include <linux/idr.h>
  21
  22 #include "../w1/w1.h"
  23 #include "../w1/slaves/w1_ds2781.h"
  24
  25 /* Current unit measurement in uA for a 1 milli-ohm sense resistor */
  26 #define DS2781_CURRENT_UNITS    1563
  27 /* Charge unit measurement in uAh for a 1 milli-ohm sense resistor */
  28 #define DS2781_CHARGE_UNITS             6250
  29 /* Number of bytes in user EEPROM space */
  30 #define DS2781_USER_EEPROM_SIZE         (DS2781_EEPROM_BLOCK0_END - \
  31                                         DS2781_EEPROM_BLOCK0_START + 1)
  32 /* Number of bytes in parameter EEPROM space */
  33 #define DS2781_PARAM_EEPROM_SIZE        (DS2781_EEPROM_BLOCK1_END - \
  34                                         DS2781_EEPROM_BLOCK1_START + 1)
  35
  36 struct ds2781_device_info {
  37         struct device *dev;
  38         struct power_supply *bat;
  39         struct power_supply_desc bat_desc;
  40         struct device *w1_dev;
  41 };
  42
  43 enum current_types {
  44         CURRENT_NOW,
  45         CURRENT_AVG,
  46 };
  47
  48 static const char model[] = "DS2781";
  49 static const char manufacturer[] = "Maxim/Dallas";
  50
  51 static inline struct ds2781_device_info *
  52 to_ds2781_device_info(struct power_supply *psy)
  53 {
  54         return power_supply_get_drvdata(psy);
  55 }
  56
  57 static inline struct power_supply *to_power_supply(struct device *dev)
  58 {
  59         return dev_get_drvdata(dev);
  60 }
  61
  62 static inline int ds2781_battery_io(struct ds2781_device_info *dev_info,
  63         char *buf, int addr, size_t count, int io)
  64 {
  65         return w1_ds2781_io(dev_info->w1_dev, buf, addr, count, io);
  66 }
  67
  68 static int w1_ds2781_read(struct ds2781_device_info *dev_info, char *buf,
  69                 int addr, size_t count)
  70 {
  71         return ds2781_battery_io(dev_info, buf, addr, count, 0);
  72 }
  73
  74 static inline int ds2781_read8(struct ds2781_device_info *dev_info, u8 *val,
  75         int addr)
  76 {
  77         return ds2781_battery_io(dev_info, val, addr, sizeof(u8), 0);
  78 }
  79
  80 static int ds2781_read16(struct ds2781_device_info *dev_info, s16 *val,
  81         int addr)
  82 {
  83         int ret;
  84         u8 raw[2];
  85
  86         ret = ds2781_battery_io(dev_info, raw, addr, sizeof(raw), 0);
  87         if (ret < 0)
  88                 return ret;
  89
  90         *val = (raw[0] << 8) | raw[1];
  91
  92         return 0;
  93 }
  94
  95 static inline int ds2781_read_block(struct ds2781_device_info *dev_info,
  96         u8 *val, int addr, size_t count)
  97 {
  98         return ds2781_battery_io(dev_info, val, addr, count, 0);
  99 }
 100
 101 static inline int ds2781_write(struct ds2781_device_info *dev_info, u8 *val,
 102         int addr, size_t count)
 103 {
 104         return ds2781_battery_io(dev_info, val, addr, count, 1);
 105 }
 106
 107 static inline int ds2781_store_eeprom(struct device *dev, int addr)
 108 {
 109         return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_COPY_DATA);
 110 }
 111
 112 static inline int ds2781_recall_eeprom(struct device *dev, int addr)
 113 {
 114         return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_RECALL_DATA);
 115 }
 116
 117 static int ds2781_save_eeprom(struct ds2781_device_info *dev_info, int reg)
 118 {
 119         int ret;
 120
 121         ret = ds2781_store_eeprom(dev_info->w1_dev, reg);
 122         if (ret < 0)
 123                 return ret;
 124
 125         ret = ds2781_recall_eeprom(dev_info->w1_dev, reg);
 126         if (ret < 0)
 127                 return ret;
 128
 129         return 0;
 130 }
 131
 132 /* Set sense resistor value in mhos */
 133 static int ds2781_set_sense_register(struct ds2781_device_info *dev_info,
 134         u8 conductance)
 135 {
 136         int ret;
 137
 138         ret = ds2781_write(dev_info, &conductance,
 139                                 DS2781_RSNSP, sizeof(u8));
 140         if (ret < 0)
 141                 return ret;
 142
 143         return ds2781_save_eeprom(dev_info, DS2781_RSNSP);
 144 }
 145
 146 /* Get RSGAIN value from 0 to 1.999 in steps of 0.001 */
 147 static int ds2781_get_rsgain_register(struct ds2781_device_info *dev_info,
 148         u16 *rsgain)
 149 {
 150         return ds2781_read16(dev_info, rsgain, DS2781_RSGAIN_MSB);
 151 }
 152
 153 /* Set RSGAIN value from 0 to 1.999 in steps of 0.001 */
 154 static int ds2781_set_rsgain_register(struct ds2781_device_info *dev_info,
 155         u16 rsgain)
 156 {
 157         int ret;
 158         u8 raw[] = {rsgain >> 8, rsgain & 0xFF};
 159
 160         ret = ds2781_write(dev_info, raw,
 161                                 DS2781_RSGAIN_MSB, sizeof(raw));
 162         if (ret < 0)
 163                 return ret;
 164
 165         return ds2781_save_eeprom(dev_info, DS2781_RSGAIN_MSB);
 166 }
 167
 168 static int ds2781_get_voltage(struct ds2781_device_info *dev_info,
 169         int *voltage_uV)
 170 {
 171         int ret;
 172         char val[2];
 173         int voltage_raw;
 174
 175         ret = w1_ds2781_read(dev_info, val, DS2781_VOLT_MSB, 2 * sizeof(u8));
 176         if (ret < 0)
 177                 return ret;
 178         /*
 179          * The voltage value is located in 10 bits across the voltage MSB
 180          * and LSB registers in two's compliment form
 181          * Sign bit of the voltage value is in bit 7 of the voltage MSB register
 182          * Bits 9 - 3 of the voltage value are in bits 6 - 0 of the
 183          * voltage MSB register
 184          * Bits 2 - 0 of the voltage value are in bits 7 - 5 of the
 185          * voltage LSB register
 186          */
 187         voltage_raw = (val[0] << 3) |
 188                 (val[1] >> 5);
 189
 190         /* DS2781 reports voltage in units of 9.76mV, but the battery class
 191          * reports in units of uV, so convert by multiplying by 9760. */
 192         *voltage_uV = voltage_raw * 9760;
 193
 194         return 0;
 195 }
 196
 197 static int ds2781_get_temperature(struct ds2781_device_info *dev_info,
 198         int *temp)
 199 {
 200         int ret;
 201         char val[2];
 202         int temp_raw;
 203
 204         ret = w1_ds2781_read(dev_info, val, DS2781_TEMP_MSB, 2 * sizeof(u8));
 205         if (ret < 0)
 206                 return ret;
 207         /*
 208          * The temperature value is located in 10 bits across the temperature
 209          * MSB and LSB registers in two's compliment form
 210          * Sign bit of the temperature value is in bit 7 of the temperature
 211          * MSB register
 212          * Bits 9 - 3 of the temperature value are in bits 6 - 0 of the
 213          * temperature MSB register
 214          * Bits 2 - 0 of the temperature value are in bits 7 - 5 of the
 215          * temperature LSB register
 216          */
 217         temp_raw = ((val[0]) << 3) |
 218                 (val[1] >> 5);
 219         *temp = temp_raw + (temp_raw / 4);
 220
 221         return 0;
 222 }
 223
 224 static int ds2781_get_current(struct ds2781_device_info *dev_info,
 225         enum current_types type, int *current_uA)
 226 {
 227         int ret, sense_res;
 228         s16 current_raw;
 229         u8 sense_res_raw, reg_msb;
 230
 231         /*
 232          * The units of measurement for current are dependent on the value of
 233          * the sense resistor.
 234          */
 235         ret = ds2781_read8(dev_info, &sense_res_raw, DS2781_RSNSP);
 236         if (ret < 0)
 237                 return ret;
 238
 239         if (sense_res_raw == 0) {
 240                 dev_err(dev_info->dev, "sense resistor value is 0\n");
 241                 return -EINVAL;
 242         }
 243         sense_res = 1000 / sense_res_raw;
 244
 245         if (type == CURRENT_NOW)
 246                 reg_msb = DS2781_CURRENT_MSB;
 247         else if (type == CURRENT_AVG)
 248                 reg_msb = DS2781_IAVG_MSB;
 249         else
 250                 return -EINVAL;
 251
 252         /*
 253          * The current value is located in 16 bits across the current MSB
 254          * and LSB registers in two's compliment form
 255          * Sign bit of the current value is in bit 7 of the current MSB register
 256          * Bits 14 - 8 of the current value are in bits 6 - 0 of the current
 257          * MSB register
 258          * Bits 7 - 0 of the current value are in bits 7 - 0 of the current
 259          * LSB register
 260          */
 261         ret = ds2781_read16(dev_info, &current_raw, reg_msb);
 262         if (ret < 0)
 263                 return ret;
 264
 265         *current_uA = current_raw * (DS2781_CURRENT_UNITS / sense_res);
 266         return 0;
 267 }
 268
 269 static int ds2781_get_accumulated_current(struct ds2781_device_info *dev_info,
 270         int *accumulated_current)
 271 {
 272         int ret, sense_res;
 273         s16 current_raw;
 274         u8 sense_res_raw;
 275
 276         /*
 277          * The units of measurement for accumulated current are dependent on
 278          * the value of the sense resistor.
 279          */
 280         ret = ds2781_read8(dev_info, &sense_res_raw, DS2781_RSNSP);
 281         if (ret < 0)
 282                 return ret;
 283
 284         if (sense_res_raw == 0) {
 285                 dev_err(dev_info->dev, "sense resistor value is 0\n");
 286                 return -EINVAL;
 287         }
 288         sense_res = 1000 / sense_res_raw;
 289
 290         /*
 291          * The ACR value is located in 16 bits across the ACR MSB and
 292          * LSB registers
 293          * Bits 15 - 8 of the ACR value are in bits 7 - 0 of the ACR
 294          * MSB register
 295          * Bits 7 - 0 of the ACR value are in bits 7 - 0 of the ACR
 296          * LSB register
 297          */
 298         ret = ds2781_read16(dev_info, &current_raw, DS2781_ACR_MSB);
 299         if (ret < 0)
 300                 return ret;
 301
 302         *accumulated_current = current_raw * (DS2781_CHARGE_UNITS / sense_res);
 303         return 0;
 304 }
 305
 306 static int ds2781_get_capacity(struct ds2781_device_info *dev_info,
 307         int *capacity)
 308 {
 309         int ret;
 310         u8 raw;
 311
 312         ret = ds2781_read8(dev_info, &raw, DS2781_RARC);
 313         if (ret < 0)
 314                 return ret;
 315
 316         *capacity = raw;
 317         return 0;
 318 }
 319
 320 static int ds2781_get_status(struct ds2781_device_info *dev_info, int *status)
 321 {
 322         int ret, current_uA, capacity;
 323
 324         ret = ds2781_get_current(dev_info, CURRENT_NOW, &current_uA);
 325         if (ret < 0)
 326                 return ret;
 327
 328         ret = ds2781_get_capacity(dev_info, &capacity);
 329         if (ret < 0)
 330                 return ret;
 331
 332         if (power_supply_am_i_supplied(dev_info->bat)) {
 333                 if (capacity == 100)
 334                         *status = POWER_SUPPLY_STATUS_FULL;
 335                 else if (current_uA > 50000)
 336                         *status = POWER_SUPPLY_STATUS_CHARGING;
 337                 else
 338                         *status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 339         } else {
 340                 *status = POWER_SUPPLY_STATUS_DISCHARGING;
 341         }
 342         return 0;
 343 }
 344
 345 static int ds2781_get_charge_now(struct ds2781_device_info *dev_info,
 346         int *charge_now)
 347 {
 348         int ret;
 349         u16 charge_raw;
 350
 351         /*
 352          * The RAAC value is located in 16 bits across the RAAC MSB and
 353          * LSB registers
 354          * Bits 15 - 8 of the RAAC value are in bits 7 - 0 of the RAAC
 355          * MSB register
 356          * Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC
 357          * LSB register
 358          */
 359         ret = ds2781_read16(dev_info, &charge_raw, DS2781_RAAC_MSB);
 360         if (ret < 0)
 361                 return ret;
 362
 363         *charge_now = charge_raw * 1600;
 364         return 0;
 365 }
 366
 367 static int ds2781_get_control_register(struct ds2781_device_info *dev_info,
 368         u8 *control_reg)
 369 {
 370         return ds2781_read8(dev_info, control_reg, DS2781_CONTROL);
 371 }
 372
 373 static int ds2781_set_control_register(struct ds2781_device_info *dev_info,
 374         u8 control_reg)
 375 {
 376         int ret;
 377
 378         ret = ds2781_write(dev_info, &control_reg,
 379                                 DS2781_CONTROL, sizeof(u8));
 380         if (ret < 0)
 381                 return ret;
 382
 383         return ds2781_save_eeprom(dev_info, DS2781_CONTROL);
 384 }
 385
 386 static int ds2781_battery_get_property(struct power_supply *psy,
 387         enum power_supply_property psp,
 388         union power_supply_propval *val)
 389 {
 390         int ret = 0;
 391         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 392
 393         switch (psp) {
 394         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 395                 ret = ds2781_get_voltage(dev_info, &val->intval);
 396                 break;
 397
 398         case POWER_SUPPLY_PROP_TEMP:
 399                 ret = ds2781_get_temperature(dev_info, &val->intval);
 400                 break;
 401
 402         case POWER_SUPPLY_PROP_MODEL_NAME:
 403                 val->strval = model;
 404                 break;
 405
 406         case POWER_SUPPLY_PROP_MANUFACTURER:
 407                 val->strval = manufacturer;
 408                 break;
 409
 410         case POWER_SUPPLY_PROP_CURRENT_NOW:
 411                 ret = ds2781_get_current(dev_info, CURRENT_NOW, &val->intval);
 412                 break;
 413
 414         case POWER_SUPPLY_PROP_CURRENT_AVG:
 415                 ret = ds2781_get_current(dev_info, CURRENT_AVG, &val->intval);
 416                 break;
 417
 418         case POWER_SUPPLY_PROP_STATUS:
 419                 ret = ds2781_get_status(dev_info, &val->intval);
 420                 break;
 421
 422         case POWER_SUPPLY_PROP_CAPACITY:
 423                 ret = ds2781_get_capacity(dev_info, &val->intval);
 424                 break;
 425
 426         case POWER_SUPPLY_PROP_CHARGE_COUNTER:
 427                 ret = ds2781_get_accumulated_current(dev_info, &val->intval);
 428                 break;
 429
 430         case POWER_SUPPLY_PROP_CHARGE_NOW:
 431                 ret = ds2781_get_charge_now(dev_info, &val->intval);
 432                 break;
 433
 434         default:
 435                 ret = -EINVAL;
 436         }
 437
 438         return ret;
 439 }
 440
 441 static enum power_supply_property ds2781_battery_props[] = {
 442         POWER_SUPPLY_PROP_STATUS,
 443         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 444         POWER_SUPPLY_PROP_TEMP,
 445         POWER_SUPPLY_PROP_MODEL_NAME,
 446         POWER_SUPPLY_PROP_MANUFACTURER,
 447         POWER_SUPPLY_PROP_CURRENT_NOW,
 448         POWER_SUPPLY_PROP_CURRENT_AVG,
 449         POWER_SUPPLY_PROP_CAPACITY,
 450         POWER_SUPPLY_PROP_CHARGE_COUNTER,
 451         POWER_SUPPLY_PROP_CHARGE_NOW,
 452 };
 453
 454 static ssize_t ds2781_get_pmod_enabled(struct device *dev,
 455         struct device_attribute *attr,
 456         char *buf)
 457 {
 458         int ret;
 459         u8 control_reg;
 460         struct power_supply *psy = to_power_supply(dev);
 461         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 462
 463         /* Get power mode */
 464         ret = ds2781_get_control_register(dev_info, &control_reg);
 465         if (ret < 0)
 466                 return ret;
 467
 468         return sprintf(buf, "%d\n",
 469                  !!(control_reg & DS2781_CONTROL_PMOD));
 470 }
 471
 472 static ssize_t ds2781_set_pmod_enabled(struct device *dev,
 473         struct device_attribute *attr,
 474         const char *buf,
 475         size_t count)
 476 {
 477         int ret;
 478         u8 control_reg, new_setting;
 479         struct power_supply *psy = to_power_supply(dev);
 480         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 481
 482         /* Set power mode */
 483         ret = ds2781_get_control_register(dev_info, &control_reg);
 484         if (ret < 0)
 485                 return ret;
 486
 487         ret = kstrtou8(buf, 0, &new_setting);
 488         if (ret < 0)
 489                 return ret;
 490
 491         if ((new_setting != 0) && (new_setting != 1)) {
 492                 dev_err(dev_info->dev, "Invalid pmod setting (0 or 1)\n");
 493                 return -EINVAL;
 494         }
 495
 496         if (new_setting)
 497                 control_reg |= DS2781_CONTROL_PMOD;
 498         else
 499                 control_reg &= ~DS2781_CONTROL_PMOD;
 500
 501         ret = ds2781_set_control_register(dev_info, control_reg);
 502         if (ret < 0)
 503                 return ret;
 504
 505         return count;
 506 }
 507
 508 static ssize_t ds2781_get_sense_resistor_value(struct device *dev,
 509         struct device_attribute *attr,
 510         char *buf)
 511 {
 512         int ret;
 513         u8 sense_resistor;
 514         struct power_supply *psy = to_power_supply(dev);
 515         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 516
 517         ret = ds2781_read8(dev_info, &sense_resistor, DS2781_RSNSP);
 518         if (ret < 0)
 519                 return ret;
 520
 521         ret = sprintf(buf, "%d\n", sense_resistor);
 522         return ret;
 523 }
 524
 525 static ssize_t ds2781_set_sense_resistor_value(struct device *dev,
 526         struct device_attribute *attr,
 527         const char *buf,
 528         size_t count)
 529 {
 530         int ret;
 531         u8 new_setting;
 532         struct power_supply *psy = to_power_supply(dev);
 533         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 534
 535         ret = kstrtou8(buf, 0, &new_setting);
 536         if (ret < 0)
 537                 return ret;
 538
 539         ret = ds2781_set_sense_register(dev_info, new_setting);
 540         if (ret < 0)
 541                 return ret;
 542
 543         return count;
 544 }
 545
 546 static ssize_t ds2781_get_rsgain_setting(struct device *dev,
 547         struct device_attribute *attr,
 548         char *buf)
 549 {
 550         int ret;
 551         u16 rsgain;
 552         struct power_supply *psy = to_power_supply(dev);
 553         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 554
 555         ret = ds2781_get_rsgain_register(dev_info, &rsgain);
 556         if (ret < 0)
 557                 return ret;
 558
 559         return sprintf(buf, "%d\n", rsgain);
 560 }
 561
 562 static ssize_t ds2781_set_rsgain_setting(struct device *dev,
 563         struct device_attribute *attr,
 564         const char *buf,
 565         size_t count)
 566 {
 567         int ret;
 568         u16 new_setting;
 569         struct power_supply *psy = to_power_supply(dev);
 570         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 571
 572         ret = kstrtou16(buf, 0, &new_setting);
 573         if (ret < 0)
 574                 return ret;
 575
 576         /* Gain can only be from 0 to 1.999 in steps of .001 */
 577         if (new_setting > 1999) {
 578                 dev_err(dev_info->dev, "Invalid rsgain setting (0 - 1999)\n");
 579                 return -EINVAL;
 580         }
 581
 582         ret = ds2781_set_rsgain_register(dev_info, new_setting);
 583         if (ret < 0)
 584                 return ret;
 585
 586         return count;
 587 }
 588
 589 static ssize_t ds2781_get_pio_pin(struct device *dev,
 590         struct device_attribute *attr,
 591         char *buf)
 592 {
 593         int ret;
 594         u8 sfr;
 595         struct power_supply *psy = to_power_supply(dev);
 596         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 597
 598         ret = ds2781_read8(dev_info, &sfr, DS2781_SFR);
 599         if (ret < 0)
 600                 return ret;
 601
 602         ret = sprintf(buf, "%d\n", sfr & DS2781_SFR_PIOSC);
 603         return ret;
 604 }
 605
 606 static ssize_t ds2781_set_pio_pin(struct device *dev,
 607         struct device_attribute *attr,
 608         const char *buf,
 609         size_t count)
 610 {
 611         int ret;
 612         u8 new_setting;
 613         struct power_supply *psy = to_power_supply(dev);
 614         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 615
 616         ret = kstrtou8(buf, 0, &new_setting);
 617         if (ret < 0)
 618                 return ret;
 619
 620         if ((new_setting != 0) && (new_setting != 1)) {
 621                 dev_err(dev_info->dev, "Invalid pio_pin setting (0 or 1)\n");
 622                 return -EINVAL;
 623         }
 624
 625         ret = ds2781_write(dev_info, &new_setting,
 626                                 DS2781_SFR, sizeof(u8));
 627         if (ret < 0)
 628                 return ret;
 629
 630         return count;
 631 }
 632
 633 static ssize_t ds2781_read_param_eeprom_bin(struct file *filp,
 634                                 struct kobject *kobj,
 635                                 struct bin_attribute *bin_attr,
 636                                 char *buf, loff_t off, size_t count)
 637 {
 638         struct device *dev = container_of(kobj, struct device, kobj);
 639         struct power_supply *psy = to_power_supply(dev);
 640         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 641
 642         count = min_t(loff_t, count, DS2781_PARAM_EEPROM_SIZE - off);
 643
 644         return ds2781_read_block(dev_info, buf,
 645                                 DS2781_EEPROM_BLOCK1_START + off, count);
 646 }
 647
 648 static ssize_t ds2781_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 ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 656         int ret;
 657
 658         count = min_t(loff_t, count, DS2781_PARAM_EEPROM_SIZE - off);
 659
 660         ret = ds2781_write(dev_info, buf,
 661                                 DS2781_EEPROM_BLOCK1_START + off, count);
 662         if (ret < 0)
 663                 return ret;
 664
 665         ret = ds2781_save_eeprom(dev_info, DS2781_EEPROM_BLOCK1_START);
 666         if (ret < 0)
 667                 return ret;
 668
 669         return count;
 670 }
 671
 672 static struct bin_attribute ds2781_param_eeprom_bin_attr = {
 673         .attr = {
 674                 .name = "param_eeprom",
 675                 .mode = S_IRUGO | S_IWUSR,
 676         },
 677         .size = DS2781_PARAM_EEPROM_SIZE,
 678         .read = ds2781_read_param_eeprom_bin,
 679         .write = ds2781_write_param_eeprom_bin,
 680 };
 681
 682 static ssize_t ds2781_read_user_eeprom_bin(struct file *filp,
 683                                 struct kobject *kobj,
 684                                 struct bin_attribute *bin_attr,
 685                                 char *buf, loff_t off, size_t count)
 686 {
 687         struct device *dev = container_of(kobj, struct device, kobj);
 688         struct power_supply *psy = to_power_supply(dev);
 689         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 690
 691         count = min_t(loff_t, count, DS2781_USER_EEPROM_SIZE - off);
 692
 693         return ds2781_read_block(dev_info, buf,
 694                                 DS2781_EEPROM_BLOCK0_START + off, count);
 695
 696 }
 697
 698 static ssize_t ds2781_write_user_eeprom_bin(struct file *filp,
 699                                 struct kobject *kobj,
 700                                 struct bin_attribute *bin_attr,
 701                                 char *buf, loff_t off, size_t count)
 702 {
 703         struct device *dev = container_of(kobj, struct device, kobj);
 704         struct power_supply *psy = to_power_supply(dev);
 705         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 706         int ret;
 707
 708         count = min_t(loff_t, count, DS2781_USER_EEPROM_SIZE - off);
 709
 710         ret = ds2781_write(dev_info, buf,
 711                                 DS2781_EEPROM_BLOCK0_START + off, count);
 712         if (ret < 0)
 713                 return ret;
 714
 715         ret = ds2781_save_eeprom(dev_info, DS2781_EEPROM_BLOCK0_START);
 716         if (ret < 0)
 717                 return ret;
 718
 719         return count;
 720 }
 721
 722 static struct bin_attribute ds2781_user_eeprom_bin_attr = {
 723         .attr = {
 724                 .name = "user_eeprom",
 725                 .mode = S_IRUGO | S_IWUSR,
 726         },
 727         .size = DS2781_USER_EEPROM_SIZE,
 728         .read = ds2781_read_user_eeprom_bin,
 729         .write = ds2781_write_user_eeprom_bin,
 730 };
 731
 732 static DEVICE_ATTR(pmod_enabled, S_IRUGO | S_IWUSR, ds2781_get_pmod_enabled,
 733         ds2781_set_pmod_enabled);
 734 static DEVICE_ATTR(sense_resistor_value, S_IRUGO | S_IWUSR,
 735         ds2781_get_sense_resistor_value, ds2781_set_sense_resistor_value);
 736 static DEVICE_ATTR(rsgain_setting, S_IRUGO | S_IWUSR, ds2781_get_rsgain_setting,
 737         ds2781_set_rsgain_setting);
 738 static DEVICE_ATTR(pio_pin, S_IRUGO | S_IWUSR, ds2781_get_pio_pin,
 739         ds2781_set_pio_pin);
 740
 741
 742 static struct attribute *ds2781_attributes[] = {
 743         &dev_attr_pmod_enabled.attr,
 744         &dev_attr_sense_resistor_value.attr,
 745         &dev_attr_rsgain_setting.attr,
 746         &dev_attr_pio_pin.attr,
 747         NULL
 748 };
 749
 750 static const struct attribute_group ds2781_attr_group = {
 751         .attrs = ds2781_attributes,
 752 };
 753
 754 static int ds2781_battery_probe(struct platform_device *pdev)
 755 {
 756         struct power_supply_config psy_cfg = {};
 757         int ret = 0;
 758         struct ds2781_device_info *dev_info;
 759
 760         dev_info = devm_kzalloc(&pdev->dev, sizeof(*dev_info), GFP_KERNEL);
 761         if (!dev_info)
 762                 return -ENOMEM;
 763
 764         platform_set_drvdata(pdev, dev_info);
 765
 766         dev_info->dev                   = &pdev->dev;
 767         dev_info->w1_dev                = pdev->dev.parent;
 768         dev_info->bat_desc.name         = dev_name(&pdev->dev);
 769         dev_info->bat_desc.type         = POWER_SUPPLY_TYPE_BATTERY;
 770         dev_info->bat_desc.properties   = ds2781_battery_props;
 771         dev_info->bat_desc.num_properties = ARRAY_SIZE(ds2781_battery_props);
 772         dev_info->bat_desc.get_property = ds2781_battery_get_property;
 773
 774         psy_cfg.drv_data                = dev_info;
 775
 776         dev_info->bat = power_supply_register(&pdev->dev, &dev_info->bat_desc,
 777                                                 &psy_cfg);
 778         if (IS_ERR(dev_info->bat)) {
 779                 dev_err(dev_info->dev, "failed to register battery\n");
 780                 ret = PTR_ERR(dev_info->bat);
 781                 goto fail;
 782         }
 783
 784         ret = sysfs_create_group(&dev_info->bat->dev.kobj, &ds2781_attr_group);
 785         if (ret) {
 786                 dev_err(dev_info->dev, "failed to create sysfs group\n");
 787                 goto fail_unregister;
 788         }
 789
 790         ret = sysfs_create_bin_file(&dev_info->bat->dev.kobj,
 791                                         &ds2781_param_eeprom_bin_attr);
 792         if (ret) {
 793                 dev_err(dev_info->dev,
 794                                 "failed to create param eeprom bin file");
 795                 goto fail_remove_group;
 796         }
 797
 798         ret = sysfs_create_bin_file(&dev_info->bat->dev.kobj,
 799                                         &ds2781_user_eeprom_bin_attr);
 800         if (ret) {
 801                 dev_err(dev_info->dev,
 802                                 "failed to create user eeprom bin file");
 803                 goto fail_remove_bin_file;
 804         }
 805
 806         return 0;
 807
 808 fail_remove_bin_file:
 809         sysfs_remove_bin_file(&dev_info->bat->dev.kobj,
 810                                 &ds2781_param_eeprom_bin_attr);
 811 fail_remove_group:
 812         sysfs_remove_group(&dev_info->bat->dev.kobj, &ds2781_attr_group);
 813 fail_unregister:
 814         power_supply_unregister(dev_info->bat);
 815 fail:
 816         return ret;
 817 }
 818
 819 static int ds2781_battery_remove(struct platform_device *pdev)
 820 {
 821         struct ds2781_device_info *dev_info = platform_get_drvdata(pdev);
 822
 823         /*
 824          * Remove attributes before unregistering power supply
 825          * because 'bat' will be freed on power_supply_unregister() call.
 826          */
 827         sysfs_remove_group(&dev_info->bat->dev.kobj, &ds2781_attr_group);
 828
 829         power_supply_unregister(dev_info->bat);
 830
 831         return 0;
 832 }
 833
 834 static struct platform_driver ds2781_battery_driver = {
 835         .driver = {
 836                 .name = "ds2781-battery",
 837         },
 838         .probe    = ds2781_battery_probe,
 839         .remove   = ds2781_battery_remove,
 840 };
 841 module_platform_driver(ds2781_battery_driver);
 842
 843 MODULE_LICENSE("GPL");
 844 MODULE_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>");
 845 MODULE_DESCRIPTION("Maxim/Dallas DS2781 Stand-Alone Fuel Gauage IC driver");
 846 MODULE_ALIAS("platform:ds2781-battery");
 847