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 <linux/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, ¤t_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, ¤t_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, ¤t_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 return ds2781_read_block(dev_info, buf, 643 DS2781_EEPROM_BLOCK1_START + off, count); 644 } 645 646 static ssize_t ds2781_write_param_eeprom_bin(struct file *filp, 647 struct kobject *kobj, 648 struct bin_attribute *bin_attr, 649 char *buf, loff_t off, size_t count) 650 { 651 struct device *dev = container_of(kobj, struct device, kobj); 652 struct power_supply *psy = to_power_supply(dev); 653 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); 654 int ret; 655 656 ret = ds2781_write(dev_info, buf, 657 DS2781_EEPROM_BLOCK1_START + off, count); 658 if (ret < 0) 659 return ret; 660 661 ret = ds2781_save_eeprom(dev_info, DS2781_EEPROM_BLOCK1_START); 662 if (ret < 0) 663 return ret; 664 665 return count; 666 } 667 668 static const struct bin_attribute ds2781_param_eeprom_bin_attr = { 669 .attr = { 670 .name = "param_eeprom", 671 .mode = S_IRUGO | S_IWUSR, 672 }, 673 .size = DS2781_PARAM_EEPROM_SIZE, 674 .read = ds2781_read_param_eeprom_bin, 675 .write = ds2781_write_param_eeprom_bin, 676 }; 677 678 static ssize_t ds2781_read_user_eeprom_bin(struct file *filp, 679 struct kobject *kobj, 680 struct bin_attribute *bin_attr, 681 char *buf, loff_t off, size_t count) 682 { 683 struct device *dev = container_of(kobj, struct device, kobj); 684 struct power_supply *psy = to_power_supply(dev); 685 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); 686 687 return ds2781_read_block(dev_info, buf, 688 DS2781_EEPROM_BLOCK0_START + off, count); 689 690 } 691 692 static ssize_t ds2781_write_user_eeprom_bin(struct file *filp, 693 struct kobject *kobj, 694 struct bin_attribute *bin_attr, 695 char *buf, loff_t off, size_t count) 696 { 697 struct device *dev = container_of(kobj, struct device, kobj); 698 struct power_supply *psy = to_power_supply(dev); 699 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); 700 int ret; 701 702 ret = ds2781_write(dev_info, buf, 703 DS2781_EEPROM_BLOCK0_START + off, count); 704 if (ret < 0) 705 return ret; 706 707 ret = ds2781_save_eeprom(dev_info, DS2781_EEPROM_BLOCK0_START); 708 if (ret < 0) 709 return ret; 710 711 return count; 712 } 713 714 static const struct bin_attribute ds2781_user_eeprom_bin_attr = { 715 .attr = { 716 .name = "user_eeprom", 717 .mode = S_IRUGO | S_IWUSR, 718 }, 719 .size = DS2781_USER_EEPROM_SIZE, 720 .read = ds2781_read_user_eeprom_bin, 721 .write = ds2781_write_user_eeprom_bin, 722 }; 723 724 static DEVICE_ATTR(pmod_enabled, S_IRUGO | S_IWUSR, ds2781_get_pmod_enabled, 725 ds2781_set_pmod_enabled); 726 static DEVICE_ATTR(sense_resistor_value, S_IRUGO | S_IWUSR, 727 ds2781_get_sense_resistor_value, ds2781_set_sense_resistor_value); 728 static DEVICE_ATTR(rsgain_setting, S_IRUGO | S_IWUSR, ds2781_get_rsgain_setting, 729 ds2781_set_rsgain_setting); 730 static DEVICE_ATTR(pio_pin, S_IRUGO | S_IWUSR, ds2781_get_pio_pin, 731 ds2781_set_pio_pin); 732 733 734 static struct attribute *ds2781_attributes[] = { 735 &dev_attr_pmod_enabled.attr, 736 &dev_attr_sense_resistor_value.attr, 737 &dev_attr_rsgain_setting.attr, 738 &dev_attr_pio_pin.attr, 739 NULL 740 }; 741 742 static const struct attribute_group ds2781_attr_group = { 743 .attrs = ds2781_attributes, 744 }; 745 746 static int ds2781_battery_probe(struct platform_device *pdev) 747 { 748 struct power_supply_config psy_cfg = {}; 749 int ret = 0; 750 struct ds2781_device_info *dev_info; 751 752 dev_info = devm_kzalloc(&pdev->dev, sizeof(*dev_info), GFP_KERNEL); 753 if (!dev_info) 754 return -ENOMEM; 755 756 platform_set_drvdata(pdev, dev_info); 757 758 dev_info->dev = &pdev->dev; 759 dev_info->w1_dev = pdev->dev.parent; 760 dev_info->bat_desc.name = dev_name(&pdev->dev); 761 dev_info->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY; 762 dev_info->bat_desc.properties = ds2781_battery_props; 763 dev_info->bat_desc.num_properties = ARRAY_SIZE(ds2781_battery_props); 764 dev_info->bat_desc.get_property = ds2781_battery_get_property; 765 766 psy_cfg.drv_data = dev_info; 767 768 dev_info->bat = power_supply_register(&pdev->dev, &dev_info->bat_desc, 769 &psy_cfg); 770 if (IS_ERR(dev_info->bat)) { 771 dev_err(dev_info->dev, "failed to register battery\n"); 772 ret = PTR_ERR(dev_info->bat); 773 goto fail; 774 } 775 776 ret = sysfs_create_group(&dev_info->bat->dev.kobj, &ds2781_attr_group); 777 if (ret) { 778 dev_err(dev_info->dev, "failed to create sysfs group\n"); 779 goto fail_unregister; 780 } 781 782 ret = sysfs_create_bin_file(&dev_info->bat->dev.kobj, 783 &ds2781_param_eeprom_bin_attr); 784 if (ret) { 785 dev_err(dev_info->dev, 786 "failed to create param eeprom bin file"); 787 goto fail_remove_group; 788 } 789 790 ret = sysfs_create_bin_file(&dev_info->bat->dev.kobj, 791 &ds2781_user_eeprom_bin_attr); 792 if (ret) { 793 dev_err(dev_info->dev, 794 "failed to create user eeprom bin file"); 795 goto fail_remove_bin_file; 796 } 797 798 return 0; 799 800 fail_remove_bin_file: 801 sysfs_remove_bin_file(&dev_info->bat->dev.kobj, 802 &ds2781_param_eeprom_bin_attr); 803 fail_remove_group: 804 sysfs_remove_group(&dev_info->bat->dev.kobj, &ds2781_attr_group); 805 fail_unregister: 806 power_supply_unregister(dev_info->bat); 807 fail: 808 return ret; 809 } 810 811 static int ds2781_battery_remove(struct platform_device *pdev) 812 { 813 struct ds2781_device_info *dev_info = platform_get_drvdata(pdev); 814 815 /* 816 * Remove attributes before unregistering power supply 817 * because 'bat' will be freed on power_supply_unregister() call. 818 */ 819 sysfs_remove_group(&dev_info->bat->dev.kobj, &ds2781_attr_group); 820 821 power_supply_unregister(dev_info->bat); 822 823 return 0; 824 } 825 826 static struct platform_driver ds2781_battery_driver = { 827 .driver = { 828 .name = "ds2781-battery", 829 }, 830 .probe = ds2781_battery_probe, 831 .remove = ds2781_battery_remove, 832 }; 833 module_platform_driver(ds2781_battery_driver); 834 835 MODULE_LICENSE("GPL"); 836 MODULE_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>"); 837 MODULE_DESCRIPTION("Maxim/Dallas DS2781 Stand-Alone Fuel Gauage IC driver"); 838 MODULE_ALIAS("platform:ds2781-battery"); 839 840