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 device *w1_dev;
  40 };
  41
  42 enum current_types {
  43         CURRENT_NOW,
  44         CURRENT_AVG,
  45 };
  46
  47 static const char model[] = "DS2781";
  48 static const char manufacturer[] = "Maxim/Dallas";
  49
  50 static inline struct ds2781_device_info *
  51 to_ds2781_device_info(struct power_supply *psy)
  52 {
  53         return container_of(psy, struct ds2781_device_info, bat);
  54 }
  55
  56 static inline struct power_supply *to_power_supply(struct device *dev)
  57 {
  58         return dev_get_drvdata(dev);
  59 }
  60
  61 static inline int ds2781_battery_io(struct ds2781_device_info *dev_info,
  62         char *buf, int addr, size_t count, int io)
  63 {
  64         return w1_ds2781_io(dev_info->w1_dev, buf, addr, count, io);
  65 }
  66
  67 static int w1_ds2781_read(struct ds2781_device_info *dev_info, char *buf,
  68                 int addr, size_t count)
  69 {
  70         return ds2781_battery_io(dev_info, buf, addr, count, 0);
  71 }
  72
  73 static inline int ds2781_read8(struct ds2781_device_info *dev_info, u8 *val,
  74         int addr)
  75 {
  76         return ds2781_battery_io(dev_info, val, addr, sizeof(u8), 0);
  77 }
  78
  79 static int ds2781_read16(struct ds2781_device_info *dev_info, s16 *val,
  80         int addr)
  81 {
  82         int ret;
  83         u8 raw[2];
  84
  85         ret = ds2781_battery_io(dev_info, raw, addr, sizeof(raw), 0);
  86         if (ret < 0)
  87                 return ret;
  88
  89         *val = (raw[0] << 8) | raw[1];
  90
  91         return 0;
  92 }
  93
  94 static inline int ds2781_read_block(struct ds2781_device_info *dev_info,
  95         u8 *val, int addr, size_t count)
  96 {
  97         return ds2781_battery_io(dev_info, val, addr, count, 0);
  98 }
  99
 100 static inline int ds2781_write(struct ds2781_device_info *dev_info, u8 *val,
 101         int addr, size_t count)
 102 {
 103         return ds2781_battery_io(dev_info, val, addr, count, 1);
 104 }
 105
 106 static inline int ds2781_store_eeprom(struct device *dev, int addr)
 107 {
 108         return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_COPY_DATA);
 109 }
 110
 111 static inline int ds2781_recall_eeprom(struct device *dev, int addr)
 112 {
 113         return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_RECALL_DATA);
 114 }
 115
 116 static int ds2781_save_eeprom(struct ds2781_device_info *dev_info, int reg)
 117 {
 118         int ret;
 119
 120         ret = ds2781_store_eeprom(dev_info->w1_dev, reg);
 121         if (ret < 0)
 122                 return ret;
 123
 124         ret = ds2781_recall_eeprom(dev_info->w1_dev, reg);
 125         if (ret < 0)
 126                 return ret;
 127
 128         return 0;
 129 }
 130
 131 /* Set sense resistor value in mhos */
 132 static int ds2781_set_sense_register(struct ds2781_device_info *dev_info,
 133         u8 conductance)
 134 {
 135         int ret;
 136
 137         ret = ds2781_write(dev_info, &conductance,
 138                                 DS2781_RSNSP, sizeof(u8));
 139         if (ret < 0)
 140                 return ret;
 141
 142         return ds2781_save_eeprom(dev_info, DS2781_RSNSP);
 143 }
 144
 145 /* Get RSGAIN value from 0 to 1.999 in steps of 0.001 */
 146 static int ds2781_get_rsgain_register(struct ds2781_device_info *dev_info,
 147         u16 *rsgain)
 148 {
 149         return ds2781_read16(dev_info, rsgain, DS2781_RSGAIN_MSB);
 150 }
 151
 152 /* Set RSGAIN value from 0 to 1.999 in steps of 0.001 */
 153 static int ds2781_set_rsgain_register(struct ds2781_device_info *dev_info,
 154         u16 rsgain)
 155 {
 156         int ret;
 157         u8 raw[] = {rsgain >> 8, rsgain & 0xFF};
 158
 159         ret = ds2781_write(dev_info, raw,
 160                                 DS2781_RSGAIN_MSB, sizeof(raw));
 161         if (ret < 0)
 162                 return ret;
 163
 164         return ds2781_save_eeprom(dev_info, DS2781_RSGAIN_MSB);
 165 }
 166
 167 static int ds2781_get_voltage(struct ds2781_device_info *dev_info,
 168         int *voltage_uV)
 169 {
 170         int ret;
 171         char val[2];
 172         int voltage_raw;
 173
 174         ret = w1_ds2781_read(dev_info, val, DS2781_VOLT_MSB, 2 * sizeof(u8));
 175         if (ret < 0)
 176                 return ret;
 177         /*
 178          * The voltage value is located in 10 bits across the voltage MSB
 179          * and LSB registers in two's compliment form
 180          * Sign bit of the voltage value is in bit 7 of the voltage MSB register
 181          * Bits 9 - 3 of the voltage value are in bits 6 - 0 of the
 182          * voltage MSB register
 183          * Bits 2 - 0 of the voltage value are in bits 7 - 5 of the
 184          * voltage LSB register
 185          */
 186         voltage_raw = (val[0] << 3) |
 187                 (val[1] >> 5);
 188
 189         /* DS2781 reports voltage in units of 9.76mV, but the battery class
 190          * reports in units of uV, so convert by multiplying by 9760. */
 191         *voltage_uV = voltage_raw * 9760;
 192
 193         return 0;
 194 }
 195
 196 static int ds2781_get_temperature(struct ds2781_device_info *dev_info,
 197         int *temp)
 198 {
 199         int ret;
 200         char val[2];
 201         int temp_raw;
 202
 203         ret = w1_ds2781_read(dev_info, val, DS2781_TEMP_MSB, 2 * sizeof(u8));
 204         if (ret < 0)
 205                 return ret;
 206         /*
 207          * The temperature value is located in 10 bits across the temperature
 208          * MSB and LSB registers in two's compliment form
 209          * Sign bit of the temperature value is in bit 7 of the temperature
 210          * MSB register
 211          * Bits 9 - 3 of the temperature value are in bits 6 - 0 of the
 212          * temperature MSB register
 213          * Bits 2 - 0 of the temperature value are in bits 7 - 5 of the
 214          * temperature LSB register
 215          */
 216         temp_raw = ((val[0]) << 3) |
 217                 (val[1] >> 5);
 218         *temp = temp_raw + (temp_raw / 4);
 219
 220         return 0;
 221 }
 222
 223 static int ds2781_get_current(struct ds2781_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 = ds2781_read8(dev_info, &sense_res_raw, DS2781_RSNSP);
 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 = DS2781_CURRENT_MSB;
 246         else if (type == CURRENT_AVG)
 247                 reg_msb = DS2781_IAVG_MSB;
 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 = ds2781_read16(dev_info, &current_raw, reg_msb);
 261         if (ret < 0)
 262                 return ret;
 263
 264         *current_uA = current_raw * (DS2781_CURRENT_UNITS / sense_res);
 265         return 0;
 266 }
 267
 268 static int ds2781_get_accumulated_current(struct ds2781_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 = ds2781_read8(dev_info, &sense_res_raw, DS2781_RSNSP);
 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 -EINVAL;
 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 = ds2781_read16(dev_info, &current_raw, DS2781_ACR_MSB);
 298         if (ret < 0)
 299                 return ret;
 300
 301         *accumulated_current = current_raw * (DS2781_CHARGE_UNITS / sense_res);
 302         return 0;
 303 }
 304
 305 static int ds2781_get_capacity(struct ds2781_device_info *dev_info,
 306         int *capacity)
 307 {
 308         int ret;
 309         u8 raw;
 310
 311         ret = ds2781_read8(dev_info, &raw, DS2781_RARC);
 312         if (ret < 0)
 313                 return ret;
 314
 315         *capacity = raw;
 316         return 0;
 317 }
 318
 319 static int ds2781_get_status(struct ds2781_device_info *dev_info, int *status)
 320 {
 321         int ret, current_uA, capacity;
 322
 323         ret = ds2781_get_current(dev_info, CURRENT_NOW, &current_uA);
 324         if (ret < 0)
 325                 return ret;
 326
 327         ret = ds2781_get_capacity(dev_info, &capacity);
 328         if (ret < 0)
 329                 return ret;
 330
 331         if (power_supply_am_i_supplied(&dev_info->bat)) {
 332                 if (capacity == 100)
 333                         *status = POWER_SUPPLY_STATUS_FULL;
 334                 else if (current_uA > 50000)
 335                         *status = POWER_SUPPLY_STATUS_CHARGING;
 336                 else
 337                         *status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 338         } else {
 339                 *status = POWER_SUPPLY_STATUS_DISCHARGING;
 340         }
 341         return 0;
 342 }
 343
 344 static int ds2781_get_charge_now(struct ds2781_device_info *dev_info,
 345         int *charge_now)
 346 {
 347         int ret;
 348         u16 charge_raw;
 349
 350         /*
 351          * The RAAC value is located in 16 bits across the RAAC MSB and
 352          * LSB registers
 353          * Bits 15 - 8 of the RAAC value are in bits 7 - 0 of the RAAC
 354          * MSB register
 355          * Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC
 356          * LSB register
 357          */
 358         ret = ds2781_read16(dev_info, &charge_raw, DS2781_RAAC_MSB);
 359         if (ret < 0)
 360                 return ret;
 361
 362         *charge_now = charge_raw * 1600;
 363         return 0;
 364 }
 365
 366 static int ds2781_get_control_register(struct ds2781_device_info *dev_info,
 367         u8 *control_reg)
 368 {
 369         return ds2781_read8(dev_info, control_reg, DS2781_CONTROL);
 370 }
 371
 372 static int ds2781_set_control_register(struct ds2781_device_info *dev_info,
 373         u8 control_reg)
 374 {
 375         int ret;
 376
 377         ret = ds2781_write(dev_info, &control_reg,
 378                                 DS2781_CONTROL, sizeof(u8));
 379         if (ret < 0)
 380                 return ret;
 381
 382         return ds2781_save_eeprom(dev_info, DS2781_CONTROL);
 383 }
 384
 385 static int ds2781_battery_get_property(struct power_supply *psy,
 386         enum power_supply_property psp,
 387         union power_supply_propval *val)
 388 {
 389         int ret = 0;
 390         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 391
 392         switch (psp) {
 393         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 394                 ret = ds2781_get_voltage(dev_info, &val->intval);
 395                 break;
 396
 397         case POWER_SUPPLY_PROP_TEMP:
 398                 ret = ds2781_get_temperature(dev_info, &val->intval);
 399                 break;
 400
 401         case POWER_SUPPLY_PROP_MODEL_NAME:
 402                 val->strval = model;
 403                 break;
 404
 405         case POWER_SUPPLY_PROP_MANUFACTURER:
 406                 val->strval = manufacturer;
 407                 break;
 408
 409         case POWER_SUPPLY_PROP_CURRENT_NOW:
 410                 ret = ds2781_get_current(dev_info, CURRENT_NOW, &val->intval);
 411                 break;
 412
 413         case POWER_SUPPLY_PROP_CURRENT_AVG:
 414                 ret = ds2781_get_current(dev_info, CURRENT_AVG, &val->intval);
 415                 break;
 416
 417         case POWER_SUPPLY_PROP_STATUS:
 418                 ret = ds2781_get_status(dev_info, &val->intval);
 419                 break;
 420
 421         case POWER_SUPPLY_PROP_CAPACITY:
 422                 ret = ds2781_get_capacity(dev_info, &val->intval);
 423                 break;
 424
 425         case POWER_SUPPLY_PROP_CHARGE_COUNTER:
 426                 ret = ds2781_get_accumulated_current(dev_info, &val->intval);
 427                 break;
 428
 429         case POWER_SUPPLY_PROP_CHARGE_NOW:
 430                 ret = ds2781_get_charge_now(dev_info, &val->intval);
 431                 break;
 432
 433         default:
 434                 ret = -EINVAL;
 435         }
 436
 437         return ret;
 438 }
 439
 440 static enum power_supply_property ds2781_battery_props[] = {
 441         POWER_SUPPLY_PROP_STATUS,
 442         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 443         POWER_SUPPLY_PROP_TEMP,
 444         POWER_SUPPLY_PROP_MODEL_NAME,
 445         POWER_SUPPLY_PROP_MANUFACTURER,
 446         POWER_SUPPLY_PROP_CURRENT_NOW,
 447         POWER_SUPPLY_PROP_CURRENT_AVG,
 448         POWER_SUPPLY_PROP_CAPACITY,
 449         POWER_SUPPLY_PROP_CHARGE_COUNTER,
 450         POWER_SUPPLY_PROP_CHARGE_NOW,
 451 };
 452
 453 static ssize_t ds2781_get_pmod_enabled(struct device *dev,
 454         struct device_attribute *attr,
 455         char *buf)
 456 {
 457         int ret;
 458         u8 control_reg;
 459         struct power_supply *psy = to_power_supply(dev);
 460         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 461
 462         /* Get power mode */
 463         ret = ds2781_get_control_register(dev_info, &control_reg);
 464         if (ret < 0)
 465                 return ret;
 466
 467         return sprintf(buf, "%d\n",
 468                  !!(control_reg & DS2781_CONTROL_PMOD));
 469 }
 470
 471 static ssize_t ds2781_set_pmod_enabled(struct device *dev,
 472         struct device_attribute *attr,
 473         const char *buf,
 474         size_t count)
 475 {
 476         int ret;
 477         u8 control_reg, new_setting;
 478         struct power_supply *psy = to_power_supply(dev);
 479         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 480
 481         /* Set power mode */
 482         ret = ds2781_get_control_register(dev_info, &control_reg);
 483         if (ret < 0)
 484                 return ret;
 485
 486         ret = kstrtou8(buf, 0, &new_setting);
 487         if (ret < 0)
 488                 return ret;
 489
 490         if ((new_setting != 0) && (new_setting != 1)) {
 491                 dev_err(dev_info->dev, "Invalid pmod setting (0 or 1)\n");
 492                 return -EINVAL;
 493         }
 494
 495         if (new_setting)
 496                 control_reg |= DS2781_CONTROL_PMOD;
 497         else
 498                 control_reg &= ~DS2781_CONTROL_PMOD;
 499
 500         ret = ds2781_set_control_register(dev_info, control_reg);
 501         if (ret < 0)
 502                 return ret;
 503
 504         return count;
 505 }
 506
 507 static ssize_t ds2781_get_sense_resistor_value(struct device *dev,
 508         struct device_attribute *attr,
 509         char *buf)
 510 {
 511         int ret;
 512         u8 sense_resistor;
 513         struct power_supply *psy = to_power_supply(dev);
 514         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 515
 516         ret = ds2781_read8(dev_info, &sense_resistor, DS2781_RSNSP);
 517         if (ret < 0)
 518                 return ret;
 519
 520         ret = sprintf(buf, "%d\n", sense_resistor);
 521         return ret;
 522 }
 523
 524 static ssize_t ds2781_set_sense_resistor_value(struct device *dev,
 525         struct device_attribute *attr,
 526         const char *buf,
 527         size_t count)
 528 {
 529         int ret;
 530         u8 new_setting;
 531         struct power_supply *psy = to_power_supply(dev);
 532         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 533
 534         ret = kstrtou8(buf, 0, &new_setting);
 535         if (ret < 0)
 536                 return ret;
 537
 538         ret = ds2781_set_sense_register(dev_info, new_setting);
 539         if (ret < 0)
 540                 return ret;
 541
 542         return count;
 543 }
 544
 545 static ssize_t ds2781_get_rsgain_setting(struct device *dev,
 546         struct device_attribute *attr,
 547         char *buf)
 548 {
 549         int ret;
 550         u16 rsgain;
 551         struct power_supply *psy = to_power_supply(dev);
 552         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 553
 554         ret = ds2781_get_rsgain_register(dev_info, &rsgain);
 555         if (ret < 0)
 556                 return ret;
 557
 558         return sprintf(buf, "%d\n", rsgain);
 559 }
 560
 561 static ssize_t ds2781_set_rsgain_setting(struct device *dev,
 562         struct device_attribute *attr,
 563         const char *buf,
 564         size_t count)
 565 {
 566         int ret;
 567         u16 new_setting;
 568         struct power_supply *psy = to_power_supply(dev);
 569         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 570
 571         ret = kstrtou16(buf, 0, &new_setting);
 572         if (ret < 0)
 573                 return ret;
 574
 575         /* Gain can only be from 0 to 1.999 in steps of .001 */
 576         if (new_setting > 1999) {
 577                 dev_err(dev_info->dev, "Invalid rsgain setting (0 - 1999)\n");
 578                 return -EINVAL;
 579         }
 580
 581         ret = ds2781_set_rsgain_register(dev_info, new_setting);
 582         if (ret < 0)
 583                 return ret;
 584
 585         return count;
 586 }
 587
 588 static ssize_t ds2781_get_pio_pin(struct device *dev,
 589         struct device_attribute *attr,
 590         char *buf)
 591 {
 592         int ret;
 593         u8 sfr;
 594         struct power_supply *psy = to_power_supply(dev);
 595         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 596
 597         ret = ds2781_read8(dev_info, &sfr, DS2781_SFR);
 598         if (ret < 0)
 599                 return ret;
 600
 601         ret = sprintf(buf, "%d\n", sfr & DS2781_SFR_PIOSC);
 602         return ret;
 603 }
 604
 605 static ssize_t ds2781_set_pio_pin(struct device *dev,
 606         struct device_attribute *attr,
 607         const char *buf,
 608         size_t count)
 609 {
 610         int ret;
 611         u8 new_setting;
 612         struct power_supply *psy = to_power_supply(dev);
 613         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 614
 615         ret = kstrtou8(buf, 0, &new_setting);
 616         if (ret < 0)
 617                 return ret;
 618
 619         if ((new_setting != 0) && (new_setting != 1)) {
 620                 dev_err(dev_info->dev, "Invalid pio_pin setting (0 or 1)\n");
 621                 return -EINVAL;
 622         }
 623
 624         ret = ds2781_write(dev_info, &new_setting,
 625                                 DS2781_SFR, sizeof(u8));
 626         if (ret < 0)
 627                 return ret;
 628
 629         return count;
 630 }
 631
 632 static ssize_t ds2781_read_param_eeprom_bin(struct file *filp,
 633                                 struct kobject *kobj,
 634                                 struct bin_attribute *bin_attr,
 635                                 char *buf, loff_t off, size_t count)
 636 {
 637         struct device *dev = container_of(kobj, struct device, kobj);
 638         struct power_supply *psy = to_power_supply(dev);
 639         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 640
 641         count = min_t(loff_t, count, DS2781_PARAM_EEPROM_SIZE - off);
 642
 643         return ds2781_read_block(dev_info, buf,
 644                                 DS2781_EEPROM_BLOCK1_START + off, count);
 645 }
 646
 647 static ssize_t ds2781_write_param_eeprom_bin(struct file *filp,
 648                                 struct kobject *kobj,
 649                                 struct bin_attribute *bin_attr,
 650                                 char *buf, loff_t off, size_t count)
 651 {
 652         struct device *dev = container_of(kobj, struct device, kobj);
 653         struct power_supply *psy = to_power_supply(dev);
 654         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 655         int ret;
 656
 657         count = min_t(loff_t, count, DS2781_PARAM_EEPROM_SIZE - off);
 658
 659         ret = ds2781_write(dev_info, buf,
 660                                 DS2781_EEPROM_BLOCK1_START + off, count);
 661         if (ret < 0)
 662                 return ret;
 663
 664         ret = ds2781_save_eeprom(dev_info, DS2781_EEPROM_BLOCK1_START);
 665         if (ret < 0)
 666                 return ret;
 667
 668         return count;
 669 }
 670
 671 static struct bin_attribute ds2781_param_eeprom_bin_attr = {
 672         .attr = {
 673                 .name = "param_eeprom",
 674                 .mode = S_IRUGO | S_IWUSR,
 675         },
 676         .size = DS2781_PARAM_EEPROM_SIZE,
 677         .read = ds2781_read_param_eeprom_bin,
 678         .write = ds2781_write_param_eeprom_bin,
 679 };
 680
 681 static ssize_t ds2781_read_user_eeprom_bin(struct file *filp,
 682                                 struct kobject *kobj,
 683                                 struct bin_attribute *bin_attr,
 684                                 char *buf, loff_t off, size_t count)
 685 {
 686         struct device *dev = container_of(kobj, struct device, kobj);
 687         struct power_supply *psy = to_power_supply(dev);
 688         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 689
 690         count = min_t(loff_t, count, DS2781_USER_EEPROM_SIZE - off);
 691
 692         return ds2781_read_block(dev_info, buf,
 693                                 DS2781_EEPROM_BLOCK0_START + off, count);
 694
 695 }
 696
 697 static ssize_t ds2781_write_user_eeprom_bin(struct file *filp,
 698                                 struct kobject *kobj,
 699                                 struct bin_attribute *bin_attr,
 700                                 char *buf, loff_t off, size_t count)
 701 {
 702         struct device *dev = container_of(kobj, struct device, kobj);
 703         struct power_supply *psy = to_power_supply(dev);
 704         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
 705         int ret;
 706
 707         count = min_t(loff_t, count, DS2781_USER_EEPROM_SIZE - off);
 708
 709         ret = ds2781_write(dev_info, buf,
 710                                 DS2781_EEPROM_BLOCK0_START + off, count);
 711         if (ret < 0)
 712                 return ret;
 713
 714         ret = ds2781_save_eeprom(dev_info, DS2781_EEPROM_BLOCK0_START);
 715         if (ret < 0)
 716                 return ret;
 717
 718         return count;
 719 }
 720
 721 static struct bin_attribute ds2781_user_eeprom_bin_attr = {
 722         .attr = {
 723                 .name = "user_eeprom",
 724                 .mode = S_IRUGO | S_IWUSR,
 725         },
 726         .size = DS2781_USER_EEPROM_SIZE,
 727         .read = ds2781_read_user_eeprom_bin,
 728         .write = ds2781_write_user_eeprom_bin,
 729 };
 730
 731 static DEVICE_ATTR(pmod_enabled, S_IRUGO | S_IWUSR, ds2781_get_pmod_enabled,
 732         ds2781_set_pmod_enabled);
 733 static DEVICE_ATTR(sense_resistor_value, S_IRUGO | S_IWUSR,
 734         ds2781_get_sense_resistor_value, ds2781_set_sense_resistor_value);
 735 static DEVICE_ATTR(rsgain_setting, S_IRUGO | S_IWUSR, ds2781_get_rsgain_setting,
 736         ds2781_set_rsgain_setting);
 737 static DEVICE_ATTR(pio_pin, S_IRUGO | S_IWUSR, ds2781_get_pio_pin,
 738         ds2781_set_pio_pin);
 739
 740
 741 static struct attribute *ds2781_attributes[] = {
 742         &dev_attr_pmod_enabled.attr,
 743         &dev_attr_sense_resistor_value.attr,
 744         &dev_attr_rsgain_setting.attr,
 745         &dev_attr_pio_pin.attr,
 746         NULL
 747 };
 748
 749 static const struct attribute_group ds2781_attr_group = {
 750         .attrs = ds2781_attributes,
 751 };
 752
 753 static int ds2781_battery_probe(struct platform_device *pdev)
 754 {
 755         int ret = 0;
 756         struct ds2781_device_info *dev_info;
 757
 758         dev_info = devm_kzalloc(&pdev->dev, sizeof(*dev_info), GFP_KERNEL);
 759         if (!dev_info)
 760                 return -ENOMEM;
 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        = ds2781_battery_props;
 769         dev_info->bat.num_properties    = ARRAY_SIZE(ds2781_battery_props);
 770         dev_info->bat.get_property      = ds2781_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;
 776         }
 777
 778         ret = sysfs_create_group(&dev_info->bat.dev->kobj, &ds2781_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                                         &ds2781_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                                         &ds2781_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                                 &ds2781_param_eeprom_bin_attr);
 805 fail_remove_group:
 806         sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2781_attr_group);
 807 fail_unregister:
 808         power_supply_unregister(&dev_info->bat);
 809 fail:
 810         return ret;
 811 }
 812
 813 static int ds2781_battery_remove(struct platform_device *pdev)
 814 {
 815         struct ds2781_device_info *dev_info = platform_get_drvdata(pdev);
 816
 817         /* remove attributes */
 818         sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2781_attr_group);
 819
 820         power_supply_unregister(&dev_info->bat);
 821
 822         return 0;
 823 }
 824
 825 static struct platform_driver ds2781_battery_driver = {
 826         .driver = {
 827                 .name = "ds2781-battery",
 828         },
 829         .probe    = ds2781_battery_probe,
 830         .remove   = ds2781_battery_remove,
 831 };
 832 module_platform_driver(ds2781_battery_driver);
 833
 834 MODULE_LICENSE("GPL");
 835 MODULE_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>");
 836 MODULE_DESCRIPTION("Maxim/Dallas DS2781 Stand-Alone Fuel Gauage IC driver");
 837 MODULE_ALIAS("platform:ds2781-battery");
 838