795 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * 1-wire client/driver for the Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC4 *5 * Author: Renata Sayakhova <renata@oktetlabs.ru>6 *7 * Based on ds2780_battery drivers8 */9 10#include <linux/module.h>11#include <linux/slab.h>12#include <linux/param.h>13#include <linux/pm.h>14#include <linux/platform_device.h>15#include <linux/power_supply.h>16#include <linux/idr.h>17 18#include <linux/w1.h>19#include "../../w1/slaves/w1_ds2781.h"20 21/* Current unit measurement in uA for a 1 milli-ohm sense resistor */22#define DS2781_CURRENT_UNITS 156323/* Charge unit measurement in uAh for a 1 milli-ohm sense resistor */24#define DS2781_CHARGE_UNITS 625025/* Number of bytes in user EEPROM space */26#define DS2781_USER_EEPROM_SIZE (DS2781_EEPROM_BLOCK0_END - \27 DS2781_EEPROM_BLOCK0_START + 1)28/* Number of bytes in parameter EEPROM space */29#define DS2781_PARAM_EEPROM_SIZE (DS2781_EEPROM_BLOCK1_END - \30 DS2781_EEPROM_BLOCK1_START + 1)31 32struct ds2781_device_info {33 struct device *dev;34 struct power_supply *bat;35 struct power_supply_desc bat_desc;36 struct device *w1_dev;37};38 39enum current_types {40 CURRENT_NOW,41 CURRENT_AVG,42};43 44static const char model[] = "DS2781";45static const char manufacturer[] = "Maxim/Dallas";46 47static inline struct ds2781_device_info *48to_ds2781_device_info(struct power_supply *psy)49{50 return power_supply_get_drvdata(psy);51}52 53static inline int ds2781_battery_io(struct ds2781_device_info *dev_info,54 char *buf, int addr, size_t count, int io)55{56 return w1_ds2781_io(dev_info->w1_dev, buf, addr, count, io);57}58 59static int w1_ds2781_read(struct ds2781_device_info *dev_info, char *buf,60 int addr, size_t count)61{62 return ds2781_battery_io(dev_info, buf, addr, count, 0);63}64 65static inline int ds2781_read8(struct ds2781_device_info *dev_info, u8 *val,66 int addr)67{68 return ds2781_battery_io(dev_info, val, addr, sizeof(u8), 0);69}70 71static int ds2781_read16(struct ds2781_device_info *dev_info, s16 *val,72 int addr)73{74 int ret;75 u8 raw[2];76 77 ret = ds2781_battery_io(dev_info, raw, addr, sizeof(raw), 0);78 if (ret < 0)79 return ret;80 81 *val = (raw[0] << 8) | raw[1];82 83 return 0;84}85 86static inline int ds2781_read_block(struct ds2781_device_info *dev_info,87 u8 *val, int addr, size_t count)88{89 return ds2781_battery_io(dev_info, val, addr, count, 0);90}91 92static inline int ds2781_write(struct ds2781_device_info *dev_info, u8 *val,93 int addr, size_t count)94{95 return ds2781_battery_io(dev_info, val, addr, count, 1);96}97 98static inline int ds2781_store_eeprom(struct device *dev, int addr)99{100 return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_COPY_DATA);101}102 103static inline int ds2781_recall_eeprom(struct device *dev, int addr)104{105 return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_RECALL_DATA);106}107 108static int ds2781_save_eeprom(struct ds2781_device_info *dev_info, int reg)109{110 int ret;111 112 ret = ds2781_store_eeprom(dev_info->w1_dev, reg);113 if (ret < 0)114 return ret;115 116 ret = ds2781_recall_eeprom(dev_info->w1_dev, reg);117 if (ret < 0)118 return ret;119 120 return 0;121}122 123/* Set sense resistor value in mhos */124static int ds2781_set_sense_register(struct ds2781_device_info *dev_info,125 u8 conductance)126{127 int ret;128 129 ret = ds2781_write(dev_info, &conductance,130 DS2781_RSNSP, sizeof(u8));131 if (ret < 0)132 return ret;133 134 return ds2781_save_eeprom(dev_info, DS2781_RSNSP);135}136 137/* Get RSGAIN value from 0 to 1.999 in steps of 0.001 */138static int ds2781_get_rsgain_register(struct ds2781_device_info *dev_info,139 u16 *rsgain)140{141 return ds2781_read16(dev_info, rsgain, DS2781_RSGAIN_MSB);142}143 144/* Set RSGAIN value from 0 to 1.999 in steps of 0.001 */145static int ds2781_set_rsgain_register(struct ds2781_device_info *dev_info,146 u16 rsgain)147{148 int ret;149 u8 raw[] = {rsgain >> 8, rsgain & 0xFF};150 151 ret = ds2781_write(dev_info, raw,152 DS2781_RSGAIN_MSB, sizeof(raw));153 if (ret < 0)154 return ret;155 156 return ds2781_save_eeprom(dev_info, DS2781_RSGAIN_MSB);157}158 159static int ds2781_get_voltage(struct ds2781_device_info *dev_info,160 int *voltage_uV)161{162 int ret;163 char val[2];164 int voltage_raw;165 166 ret = w1_ds2781_read(dev_info, val, DS2781_VOLT_MSB, 2 * sizeof(u8));167 if (ret < 0)168 return ret;169 /*170 * The voltage value is located in 10 bits across the voltage MSB171 * and LSB registers in two's complement form172 * Sign bit of the voltage value is in bit 7 of the voltage MSB register173 * Bits 9 - 3 of the voltage value are in bits 6 - 0 of the174 * voltage MSB register175 * Bits 2 - 0 of the voltage value are in bits 7 - 5 of the176 * voltage LSB register177 */178 voltage_raw = (val[0] << 3) |179 (val[1] >> 5);180 181 /* DS2781 reports voltage in units of 9.76mV, but the battery class182 * reports in units of uV, so convert by multiplying by 9760. */183 *voltage_uV = voltage_raw * 9760;184 185 return 0;186}187 188static int ds2781_get_temperature(struct ds2781_device_info *dev_info,189 int *temp)190{191 int ret;192 char val[2];193 int temp_raw;194 195 ret = w1_ds2781_read(dev_info, val, DS2781_TEMP_MSB, 2 * sizeof(u8));196 if (ret < 0)197 return ret;198 /*199 * The temperature value is located in 10 bits across the temperature200 * MSB and LSB registers in two's complement form201 * Sign bit of the temperature value is in bit 7 of the temperature202 * MSB register203 * Bits 9 - 3 of the temperature value are in bits 6 - 0 of the204 * temperature MSB register205 * Bits 2 - 0 of the temperature value are in bits 7 - 5 of the206 * temperature LSB register207 */208 temp_raw = ((val[0]) << 3) |209 (val[1] >> 5);210 *temp = temp_raw + (temp_raw / 4);211 212 return 0;213}214 215static int ds2781_get_current(struct ds2781_device_info *dev_info,216 enum current_types type, int *current_uA)217{218 int ret, sense_res;219 s16 current_raw;220 u8 sense_res_raw, reg_msb;221 222 /*223 * The units of measurement for current are dependent on the value of224 * the sense resistor.225 */226 ret = ds2781_read8(dev_info, &sense_res_raw, DS2781_RSNSP);227 if (ret < 0)228 return ret;229 230 if (sense_res_raw == 0) {231 dev_err(dev_info->dev, "sense resistor value is 0\n");232 return -EINVAL;233 }234 sense_res = 1000 / sense_res_raw;235 236 if (type == CURRENT_NOW)237 reg_msb = DS2781_CURRENT_MSB;238 else if (type == CURRENT_AVG)239 reg_msb = DS2781_IAVG_MSB;240 else241 return -EINVAL;242 243 /*244 * The current value is located in 16 bits across the current MSB245 * and LSB registers in two's complement form246 * Sign bit of the current value is in bit 7 of the current MSB register247 * Bits 14 - 8 of the current value are in bits 6 - 0 of the current248 * MSB register249 * Bits 7 - 0 of the current value are in bits 7 - 0 of the current250 * LSB register251 */252 ret = ds2781_read16(dev_info, ¤t_raw, reg_msb);253 if (ret < 0)254 return ret;255 256 *current_uA = current_raw * (DS2781_CURRENT_UNITS / sense_res);257 return 0;258}259 260static int ds2781_get_accumulated_current(struct ds2781_device_info *dev_info,261 int *accumulated_current)262{263 int ret, sense_res;264 s16 current_raw;265 u8 sense_res_raw;266 267 /*268 * The units of measurement for accumulated current are dependent on269 * the value of the sense resistor.270 */271 ret = ds2781_read8(dev_info, &sense_res_raw, DS2781_RSNSP);272 if (ret < 0)273 return ret;274 275 if (sense_res_raw == 0) {276 dev_err(dev_info->dev, "sense resistor value is 0\n");277 return -EINVAL;278 }279 sense_res = 1000 / sense_res_raw;280 281 /*282 * The ACR value is located in 16 bits across the ACR MSB and283 * LSB registers284 * Bits 15 - 8 of the ACR value are in bits 7 - 0 of the ACR285 * MSB register286 * Bits 7 - 0 of the ACR value are in bits 7 - 0 of the ACR287 * LSB register288 */289 ret = ds2781_read16(dev_info, ¤t_raw, DS2781_ACR_MSB);290 if (ret < 0)291 return ret;292 293 *accumulated_current = current_raw * (DS2781_CHARGE_UNITS / sense_res);294 return 0;295}296 297static int ds2781_get_capacity(struct ds2781_device_info *dev_info,298 int *capacity)299{300 int ret;301 u8 raw;302 303 ret = ds2781_read8(dev_info, &raw, DS2781_RARC);304 if (ret < 0)305 return ret;306 307 *capacity = raw;308 return 0;309}310 311static int ds2781_get_status(struct ds2781_device_info *dev_info, int *status)312{313 int ret, current_uA, capacity;314 315 ret = ds2781_get_current(dev_info, CURRENT_NOW, ¤t_uA);316 if (ret < 0)317 return ret;318 319 ret = ds2781_get_capacity(dev_info, &capacity);320 if (ret < 0)321 return ret;322 323 if (power_supply_am_i_supplied(dev_info->bat)) {324 if (capacity == 100)325 *status = POWER_SUPPLY_STATUS_FULL;326 else if (current_uA > 50000)327 *status = POWER_SUPPLY_STATUS_CHARGING;328 else329 *status = POWER_SUPPLY_STATUS_NOT_CHARGING;330 } else {331 *status = POWER_SUPPLY_STATUS_DISCHARGING;332 }333 return 0;334}335 336static int ds2781_get_charge_now(struct ds2781_device_info *dev_info,337 int *charge_now)338{339 int ret;340 u16 charge_raw;341 342 /*343 * The RAAC value is located in 16 bits across the RAAC MSB and344 * LSB registers345 * Bits 15 - 8 of the RAAC value are in bits 7 - 0 of the RAAC346 * MSB register347 * Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC348 * LSB register349 */350 ret = ds2781_read16(dev_info, &charge_raw, DS2781_RAAC_MSB);351 if (ret < 0)352 return ret;353 354 *charge_now = charge_raw * 1600;355 return 0;356}357 358static int ds2781_get_control_register(struct ds2781_device_info *dev_info,359 u8 *control_reg)360{361 return ds2781_read8(dev_info, control_reg, DS2781_CONTROL);362}363 364static int ds2781_set_control_register(struct ds2781_device_info *dev_info,365 u8 control_reg)366{367 int ret;368 369 ret = ds2781_write(dev_info, &control_reg,370 DS2781_CONTROL, sizeof(u8));371 if (ret < 0)372 return ret;373 374 return ds2781_save_eeprom(dev_info, DS2781_CONTROL);375}376 377static int ds2781_battery_get_property(struct power_supply *psy,378 enum power_supply_property psp,379 union power_supply_propval *val)380{381 int ret = 0;382 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);383 384 switch (psp) {385 case POWER_SUPPLY_PROP_VOLTAGE_NOW:386 ret = ds2781_get_voltage(dev_info, &val->intval);387 break;388 389 case POWER_SUPPLY_PROP_TEMP:390 ret = ds2781_get_temperature(dev_info, &val->intval);391 break;392 393 case POWER_SUPPLY_PROP_MODEL_NAME:394 val->strval = model;395 break;396 397 case POWER_SUPPLY_PROP_MANUFACTURER:398 val->strval = manufacturer;399 break;400 401 case POWER_SUPPLY_PROP_CURRENT_NOW:402 ret = ds2781_get_current(dev_info, CURRENT_NOW, &val->intval);403 break;404 405 case POWER_SUPPLY_PROP_CURRENT_AVG:406 ret = ds2781_get_current(dev_info, CURRENT_AVG, &val->intval);407 break;408 409 case POWER_SUPPLY_PROP_STATUS:410 ret = ds2781_get_status(dev_info, &val->intval);411 break;412 413 case POWER_SUPPLY_PROP_CAPACITY:414 ret = ds2781_get_capacity(dev_info, &val->intval);415 break;416 417 case POWER_SUPPLY_PROP_CHARGE_COUNTER:418 ret = ds2781_get_accumulated_current(dev_info, &val->intval);419 break;420 421 case POWER_SUPPLY_PROP_CHARGE_NOW:422 ret = ds2781_get_charge_now(dev_info, &val->intval);423 break;424 425 default:426 ret = -EINVAL;427 }428 429 return ret;430}431 432static enum power_supply_property ds2781_battery_props[] = {433 POWER_SUPPLY_PROP_STATUS,434 POWER_SUPPLY_PROP_VOLTAGE_NOW,435 POWER_SUPPLY_PROP_TEMP,436 POWER_SUPPLY_PROP_MODEL_NAME,437 POWER_SUPPLY_PROP_MANUFACTURER,438 POWER_SUPPLY_PROP_CURRENT_NOW,439 POWER_SUPPLY_PROP_CURRENT_AVG,440 POWER_SUPPLY_PROP_CAPACITY,441 POWER_SUPPLY_PROP_CHARGE_COUNTER,442 POWER_SUPPLY_PROP_CHARGE_NOW,443};444 445static ssize_t ds2781_get_pmod_enabled(struct device *dev,446 struct device_attribute *attr,447 char *buf)448{449 int ret;450 u8 control_reg;451 struct power_supply *psy = to_power_supply(dev);452 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);453 454 /* Get power mode */455 ret = ds2781_get_control_register(dev_info, &control_reg);456 if (ret < 0)457 return ret;458 459 return sysfs_emit(buf, "%d\n",460 !!(control_reg & DS2781_CONTROL_PMOD));461}462 463static ssize_t ds2781_set_pmod_enabled(struct device *dev,464 struct device_attribute *attr,465 const char *buf,466 size_t count)467{468 int ret;469 u8 control_reg, new_setting;470 struct power_supply *psy = to_power_supply(dev);471 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);472 473 /* Set power mode */474 ret = ds2781_get_control_register(dev_info, &control_reg);475 if (ret < 0)476 return ret;477 478 ret = kstrtou8(buf, 0, &new_setting);479 if (ret < 0)480 return ret;481 482 if ((new_setting != 0) && (new_setting != 1)) {483 dev_err(dev_info->dev, "Invalid pmod setting (0 or 1)\n");484 return -EINVAL;485 }486 487 if (new_setting)488 control_reg |= DS2781_CONTROL_PMOD;489 else490 control_reg &= ~DS2781_CONTROL_PMOD;491 492 ret = ds2781_set_control_register(dev_info, control_reg);493 if (ret < 0)494 return ret;495 496 return count;497}498 499static ssize_t ds2781_get_sense_resistor_value(struct device *dev,500 struct device_attribute *attr,501 char *buf)502{503 int ret;504 u8 sense_resistor;505 struct power_supply *psy = to_power_supply(dev);506 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);507 508 ret = ds2781_read8(dev_info, &sense_resistor, DS2781_RSNSP);509 if (ret < 0)510 return ret;511 512 ret = sysfs_emit(buf, "%d\n", sense_resistor);513 return ret;514}515 516static ssize_t ds2781_set_sense_resistor_value(struct device *dev,517 struct device_attribute *attr,518 const char *buf,519 size_t count)520{521 int ret;522 u8 new_setting;523 struct power_supply *psy = to_power_supply(dev);524 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);525 526 ret = kstrtou8(buf, 0, &new_setting);527 if (ret < 0)528 return ret;529 530 ret = ds2781_set_sense_register(dev_info, new_setting);531 if (ret < 0)532 return ret;533 534 return count;535}536 537static ssize_t ds2781_get_rsgain_setting(struct device *dev,538 struct device_attribute *attr,539 char *buf)540{541 int ret;542 u16 rsgain;543 struct power_supply *psy = to_power_supply(dev);544 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);545 546 ret = ds2781_get_rsgain_register(dev_info, &rsgain);547 if (ret < 0)548 return ret;549 550 return sysfs_emit(buf, "%d\n", rsgain);551}552 553static ssize_t ds2781_set_rsgain_setting(struct device *dev,554 struct device_attribute *attr,555 const char *buf,556 size_t count)557{558 int ret;559 u16 new_setting;560 struct power_supply *psy = to_power_supply(dev);561 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);562 563 ret = kstrtou16(buf, 0, &new_setting);564 if (ret < 0)565 return ret;566 567 /* Gain can only be from 0 to 1.999 in steps of .001 */568 if (new_setting > 1999) {569 dev_err(dev_info->dev, "Invalid rsgain setting (0 - 1999)\n");570 return -EINVAL;571 }572 573 ret = ds2781_set_rsgain_register(dev_info, new_setting);574 if (ret < 0)575 return ret;576 577 return count;578}579 580static ssize_t ds2781_get_pio_pin(struct device *dev,581 struct device_attribute *attr,582 char *buf)583{584 int ret;585 u8 sfr;586 struct power_supply *psy = to_power_supply(dev);587 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);588 589 ret = ds2781_read8(dev_info, &sfr, DS2781_SFR);590 if (ret < 0)591 return ret;592 593 ret = sysfs_emit(buf, "%d\n", sfr & DS2781_SFR_PIOSC);594 return ret;595}596 597static ssize_t ds2781_set_pio_pin(struct device *dev,598 struct device_attribute *attr,599 const char *buf,600 size_t count)601{602 int ret;603 u8 new_setting;604 struct power_supply *psy = to_power_supply(dev);605 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);606 607 ret = kstrtou8(buf, 0, &new_setting);608 if (ret < 0)609 return ret;610 611 if ((new_setting != 0) && (new_setting != 1)) {612 dev_err(dev_info->dev, "Invalid pio_pin setting (0 or 1)\n");613 return -EINVAL;614 }615 616 ret = ds2781_write(dev_info, &new_setting,617 DS2781_SFR, sizeof(u8));618 if (ret < 0)619 return ret;620 621 return count;622}623 624static ssize_t ds2781_read_param_eeprom_bin(struct file *filp,625 struct kobject *kobj,626 struct bin_attribute *bin_attr,627 char *buf, loff_t off, size_t count)628{629 struct device *dev = kobj_to_dev(kobj);630 struct power_supply *psy = to_power_supply(dev);631 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);632 633 return ds2781_read_block(dev_info, buf,634 DS2781_EEPROM_BLOCK1_START + off, count);635}636 637static ssize_t ds2781_write_param_eeprom_bin(struct file *filp,638 struct kobject *kobj,639 struct bin_attribute *bin_attr,640 char *buf, loff_t off, size_t count)641{642 struct device *dev = kobj_to_dev(kobj);643 struct power_supply *psy = to_power_supply(dev);644 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);645 int ret;646 647 ret = ds2781_write(dev_info, buf,648 DS2781_EEPROM_BLOCK1_START + off, count);649 if (ret < 0)650 return ret;651 652 ret = ds2781_save_eeprom(dev_info, DS2781_EEPROM_BLOCK1_START);653 if (ret < 0)654 return ret;655 656 return count;657}658 659static struct bin_attribute ds2781_param_eeprom_bin_attr = {660 .attr = {661 .name = "param_eeprom",662 .mode = S_IRUGO | S_IWUSR,663 },664 .size = DS2781_PARAM_EEPROM_SIZE,665 .read = ds2781_read_param_eeprom_bin,666 .write = ds2781_write_param_eeprom_bin,667};668 669static ssize_t ds2781_read_user_eeprom_bin(struct file *filp,670 struct kobject *kobj,671 struct bin_attribute *bin_attr,672 char *buf, loff_t off, size_t count)673{674 struct device *dev = kobj_to_dev(kobj);675 struct power_supply *psy = to_power_supply(dev);676 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);677 678 return ds2781_read_block(dev_info, buf,679 DS2781_EEPROM_BLOCK0_START + off, count);680 681}682 683static ssize_t ds2781_write_user_eeprom_bin(struct file *filp,684 struct kobject *kobj,685 struct bin_attribute *bin_attr,686 char *buf, loff_t off, size_t count)687{688 struct device *dev = kobj_to_dev(kobj);689 struct power_supply *psy = to_power_supply(dev);690 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);691 int ret;692 693 ret = ds2781_write(dev_info, buf,694 DS2781_EEPROM_BLOCK0_START + off, count);695 if (ret < 0)696 return ret;697 698 ret = ds2781_save_eeprom(dev_info, DS2781_EEPROM_BLOCK0_START);699 if (ret < 0)700 return ret;701 702 return count;703}704 705static struct bin_attribute ds2781_user_eeprom_bin_attr = {706 .attr = {707 .name = "user_eeprom",708 .mode = S_IRUGO | S_IWUSR,709 },710 .size = DS2781_USER_EEPROM_SIZE,711 .read = ds2781_read_user_eeprom_bin,712 .write = ds2781_write_user_eeprom_bin,713};714 715static DEVICE_ATTR(pmod_enabled, S_IRUGO | S_IWUSR, ds2781_get_pmod_enabled,716 ds2781_set_pmod_enabled);717static DEVICE_ATTR(sense_resistor_value, S_IRUGO | S_IWUSR,718 ds2781_get_sense_resistor_value, ds2781_set_sense_resistor_value);719static DEVICE_ATTR(rsgain_setting, S_IRUGO | S_IWUSR, ds2781_get_rsgain_setting,720 ds2781_set_rsgain_setting);721static DEVICE_ATTR(pio_pin, S_IRUGO | S_IWUSR, ds2781_get_pio_pin,722 ds2781_set_pio_pin);723 724static struct attribute *ds2781_sysfs_attrs[] = {725 &dev_attr_pmod_enabled.attr,726 &dev_attr_sense_resistor_value.attr,727 &dev_attr_rsgain_setting.attr,728 &dev_attr_pio_pin.attr,729 NULL730};731 732static struct bin_attribute *ds2781_sysfs_bin_attrs[] = {733 &ds2781_param_eeprom_bin_attr,734 &ds2781_user_eeprom_bin_attr,735 NULL,736};737 738static const struct attribute_group ds2781_sysfs_group = {739 .attrs = ds2781_sysfs_attrs,740 .bin_attrs = ds2781_sysfs_bin_attrs,741 742};743 744static const struct attribute_group *ds2781_sysfs_groups[] = {745 &ds2781_sysfs_group,746 NULL,747};748 749static int ds2781_battery_probe(struct platform_device *pdev)750{751 struct power_supply_config psy_cfg = {};752 struct ds2781_device_info *dev_info;753 754 dev_info = devm_kzalloc(&pdev->dev, sizeof(*dev_info), GFP_KERNEL);755 if (!dev_info)756 return -ENOMEM;757 758 platform_set_drvdata(pdev, dev_info);759 760 dev_info->dev = &pdev->dev;761 dev_info->w1_dev = pdev->dev.parent;762 dev_info->bat_desc.name = dev_name(&pdev->dev);763 dev_info->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;764 dev_info->bat_desc.properties = ds2781_battery_props;765 dev_info->bat_desc.num_properties = ARRAY_SIZE(ds2781_battery_props);766 dev_info->bat_desc.get_property = ds2781_battery_get_property;767 768 psy_cfg.drv_data = dev_info;769 psy_cfg.attr_grp = ds2781_sysfs_groups;770 771 dev_info->bat = devm_power_supply_register(&pdev->dev,772 &dev_info->bat_desc,773 &psy_cfg);774 if (IS_ERR(dev_info->bat)) {775 dev_err(dev_info->dev, "failed to register battery\n");776 return PTR_ERR(dev_info->bat);777 }778 779 return 0;780}781 782static struct platform_driver ds2781_battery_driver = {783 .driver = {784 .name = "ds2781-battery",785 },786 .probe = ds2781_battery_probe,787};788module_platform_driver(ds2781_battery_driver);789 790MODULE_LICENSE("GPL");791MODULE_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>");792MODULE_DESCRIPTION("Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC driver");793MODULE_ALIAS("platform:ds2781-battery");794 795