1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * 1-wire client/driver for the Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC 4 * 5 * Author: Renata Sayakhova <renata@oktetlabs.ru> 6 * 7 * Based on ds2780_battery drivers 8 */ 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 1563 23 /* Charge unit measurement in uAh for a 1 milli-ohm sense resistor */ 24 #define DS2781_CHARGE_UNITS 6250 25 /* 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 32 struct 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 39 enum current_types { 40 CURRENT_NOW, 41 CURRENT_AVG, 42 }; 43 44 static const char model[] = "DS2781"; 45 static const char manufacturer[] = "Maxim/Dallas"; 46 47 static inline struct ds2781_device_info * 48 to_ds2781_device_info(struct power_supply *psy) 49 { 50 return power_supply_get_drvdata(psy); 51 } 52 53 static 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 59 static 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 65 static 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 71 static 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 86 static 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 92 static 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 98 static inline int ds2781_store_eeprom(struct device *dev, int addr) 99 { 100 return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_COPY_DATA); 101 } 102 103 static inline int ds2781_recall_eeprom(struct device *dev, int addr) 104 { 105 return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_RECALL_DATA); 106 } 107 108 static 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 */ 124 static 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 */ 138 static 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 */ 145 static 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 } 158 159 static 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 MSB 171 * and LSB registers in two's complement form 172 * Sign bit of the voltage value is in bit 7 of the voltage MSB register 173 * Bits 9 - 3 of the voltage value are in bits 6 - 0 of the 174 * voltage MSB register 175 * Bits 2 - 0 of the voltage value are in bits 7 - 5 of the 176 * voltage LSB register 177 */ 178 voltage_raw = (val[0] << 3) | 179 (val[1] >> 5); 180 181 /* DS2781 reports voltage in units of 9.76mV, but the battery class 182 * reports in units of uV, so convert by multiplying by 9760. */ 183 *voltage_uV = voltage_raw * 9760; 184 185 return 0; 186 } 187 188 static 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 temperature 200 * MSB and LSB registers in two's complement form 201 * Sign bit of the temperature value is in bit 7 of the temperature 202 * MSB register 203 * Bits 9 - 3 of the temperature value are in bits 6 - 0 of the 204 * temperature MSB register 205 * Bits 2 - 0 of the temperature value are in bits 7 - 5 of the 206 * temperature LSB register 207 */ 208 temp_raw = ((val[0]) << 3) | 209 (val[1] >> 5); 210 *temp = temp_raw + (temp_raw / 4); 211 212 return 0; 213 } 214 215 static 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 of 224 * 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 else 241 return -EINVAL; 242 243 /* 244 * The current value is located in 16 bits across the current MSB 245 * and LSB registers in two's complement form 246 * Sign bit of the current value is in bit 7 of the current MSB register 247 * Bits 14 - 8 of the current value are in bits 6 - 0 of the current 248 * MSB register 249 * Bits 7 - 0 of the current value are in bits 7 - 0 of the current 250 * LSB register 251 */ 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 } 259 260 static 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 on 269 * 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 and 283 * LSB registers 284 * Bits 15 - 8 of the ACR value are in bits 7 - 0 of the ACR 285 * MSB register 286 * Bits 7 - 0 of the ACR value are in bits 7 - 0 of the ACR 287 * LSB register 288 */ 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 } 296 297 static 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 } 310 311 static 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 else 329 *status = POWER_SUPPLY_STATUS_NOT_CHARGING; 330 } else { 331 *status = POWER_SUPPLY_STATUS_DISCHARGING; 332 } 333 return 0; 334 } 335 336 static 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 and 344 * LSB registers 345 * Bits 15 - 8 of the RAAC value are in bits 7 - 0 of the RAAC 346 * MSB register 347 * Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC 348 * LSB register 349 */ 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 } 357 358 static 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 } 363 364 static 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 } 376 377 static 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 } 431 432 static 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 }; 444 445 static 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 sprintf(buf, "%d\n", 460 !!(control_reg & DS2781_CONTROL_PMOD)); 461 } 462 463 static 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 else 490 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 } 498 499 static 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 = sprintf(buf, "%d\n", sense_resistor); 513 return ret; 514 } 515 516 static 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 } 536 537 static 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 sprintf(buf, "%d\n", rsgain); 551 } 552 553 static 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 } 579 580 static 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 = sprintf(buf, "%d\n", sfr & DS2781_SFR_PIOSC); 594 return ret; 595 } 596 597 static 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 } 623 624 static 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 } 636 637 static 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 } 658 659 static 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 }; 668 669 static 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 } 682 683 static 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 } 704 705 static 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 }; 714 715 static DEVICE_ATTR(pmod_enabled, S_IRUGO | S_IWUSR, ds2781_get_pmod_enabled, 716 ds2781_set_pmod_enabled); 717 static DEVICE_ATTR(sense_resistor_value, S_IRUGO | S_IWUSR, 718 ds2781_get_sense_resistor_value, ds2781_set_sense_resistor_value); 719 static DEVICE_ATTR(rsgain_setting, S_IRUGO | S_IWUSR, ds2781_get_rsgain_setting, 720 ds2781_set_rsgain_setting); 721 static DEVICE_ATTR(pio_pin, S_IRUGO | S_IWUSR, ds2781_get_pio_pin, 722 ds2781_set_pio_pin); 723 724 static 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 NULL 730 }; 731 732 static struct bin_attribute *ds2781_sysfs_bin_attrs[] = { 733 &ds2781_param_eeprom_bin_attr, 734 &ds2781_user_eeprom_bin_attr, 735 NULL, 736 }; 737 738 static const struct attribute_group ds2781_sysfs_group = { 739 .attrs = ds2781_sysfs_attrs, 740 .bin_attrs = ds2781_sysfs_bin_attrs, 741 742 }; 743 744 static const struct attribute_group *ds2781_sysfs_groups[] = { 745 &ds2781_sysfs_group, 746 NULL, 747 }; 748 749 static 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 } 781 782 static struct platform_driver ds2781_battery_driver = { 783 .driver = { 784 .name = "ds2781-battery", 785 }, 786 .probe = ds2781_battery_probe, 787 }; 788 module_platform_driver(ds2781_battery_driver); 789 790 MODULE_LICENSE("GPL"); 791 MODULE_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>"); 792 MODULE_DESCRIPTION("Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC driver"); 793 MODULE_ALIAS("platform:ds2781-battery"); 794 795