1 /* 2 * Driver for batteries with DS2760 chips inside. 3 * 4 * Copyright © 2007 Anton Vorontsov 5 * 2004-2007 Matt Reimer 6 * 2004 Szabolcs Gyurko 7 * 8 * Use consistent with the GNU GPL is permitted, 9 * provided that this copyright notice is 10 * preserved in its entirety in all copies and derived works. 11 * 12 * Author: Anton Vorontsov <cbou@mail.ru> 13 * February 2007 14 * 15 * Matt Reimer <mreimer@vpop.net> 16 * April 2004, 2005, 2007 17 * 18 * Szabolcs Gyurko <szabolcs.gyurko@tlt.hu> 19 * September 2004 20 */ 21 22 #include <linux/module.h> 23 #include <linux/param.h> 24 #include <linux/jiffies.h> 25 #include <linux/workqueue.h> 26 #include <linux/pm.h> 27 #include <linux/slab.h> 28 #include <linux/platform_device.h> 29 #include <linux/power_supply.h> 30 #include <linux/suspend.h> 31 #include <linux/w1.h> 32 #include <linux/of.h> 33 34 static unsigned int cache_time = 1000; 35 module_param(cache_time, uint, 0644); 36 MODULE_PARM_DESC(cache_time, "cache time in milliseconds"); 37 38 static bool pmod_enabled; 39 module_param(pmod_enabled, bool, 0644); 40 MODULE_PARM_DESC(pmod_enabled, "PMOD enable bit"); 41 42 static unsigned int rated_capacity; 43 module_param(rated_capacity, uint, 0644); 44 MODULE_PARM_DESC(rated_capacity, "rated battery capacity, 10*mAh or index"); 45 46 static unsigned int current_accum; 47 module_param(current_accum, uint, 0644); 48 MODULE_PARM_DESC(current_accum, "current accumulator value"); 49 50 #define W1_FAMILY_DS2760 0x30 51 52 /* Known commands to the DS2760 chip */ 53 #define W1_DS2760_SWAP 0xAA 54 #define W1_DS2760_READ_DATA 0x69 55 #define W1_DS2760_WRITE_DATA 0x6C 56 #define W1_DS2760_COPY_DATA 0x48 57 #define W1_DS2760_RECALL_DATA 0xB8 58 #define W1_DS2760_LOCK 0x6A 59 60 /* Number of valid register addresses */ 61 #define DS2760_DATA_SIZE 0x40 62 63 #define DS2760_PROTECTION_REG 0x00 64 65 #define DS2760_STATUS_REG 0x01 66 #define DS2760_STATUS_IE (1 << 2) 67 #define DS2760_STATUS_SWEN (1 << 3) 68 #define DS2760_STATUS_RNAOP (1 << 4) 69 #define DS2760_STATUS_PMOD (1 << 5) 70 71 #define DS2760_EEPROM_REG 0x07 72 #define DS2760_SPECIAL_FEATURE_REG 0x08 73 #define DS2760_VOLTAGE_MSB 0x0c 74 #define DS2760_VOLTAGE_LSB 0x0d 75 #define DS2760_CURRENT_MSB 0x0e 76 #define DS2760_CURRENT_LSB 0x0f 77 #define DS2760_CURRENT_ACCUM_MSB 0x10 78 #define DS2760_CURRENT_ACCUM_LSB 0x11 79 #define DS2760_TEMP_MSB 0x18 80 #define DS2760_TEMP_LSB 0x19 81 #define DS2760_EEPROM_BLOCK0 0x20 82 #define DS2760_ACTIVE_FULL 0x20 83 #define DS2760_EEPROM_BLOCK1 0x30 84 #define DS2760_STATUS_WRITE_REG 0x31 85 #define DS2760_RATED_CAPACITY 0x32 86 #define DS2760_CURRENT_OFFSET_BIAS 0x33 87 #define DS2760_ACTIVE_EMPTY 0x3b 88 89 struct ds2760_device_info { 90 struct device *dev; 91 92 /* DS2760 data, valid after calling ds2760_battery_read_status() */ 93 unsigned long update_time; /* jiffies when data read */ 94 char raw[DS2760_DATA_SIZE]; /* raw DS2760 data */ 95 int voltage_raw; /* units of 4.88 mV */ 96 int voltage_uV; /* units of µV */ 97 int current_raw; /* units of 0.625 mA */ 98 int current_uA; /* units of µA */ 99 int accum_current_raw; /* units of 0.25 mAh */ 100 int accum_current_uAh; /* units of µAh */ 101 int temp_raw; /* units of 0.125 °C */ 102 int temp_C; /* units of 0.1 °C */ 103 int rated_capacity; /* units of µAh */ 104 int rem_capacity; /* percentage */ 105 int full_active_uAh; /* units of µAh */ 106 int empty_uAh; /* units of µAh */ 107 int life_sec; /* units of seconds */ 108 int charge_status; /* POWER_SUPPLY_STATUS_* */ 109 110 int full_counter; 111 struct power_supply *bat; 112 struct power_supply_desc bat_desc; 113 struct workqueue_struct *monitor_wqueue; 114 struct delayed_work monitor_work; 115 struct notifier_block pm_notifier; 116 }; 117 118 static int w1_ds2760_io(struct device *dev, char *buf, int addr, size_t count, 119 int io) 120 { 121 struct w1_slave *sl = container_of(dev, struct w1_slave, dev); 122 123 if (!dev) 124 return 0; 125 126 mutex_lock(&sl->master->bus_mutex); 127 128 if (addr > DS2760_DATA_SIZE || addr < 0) { 129 count = 0; 130 goto out; 131 } 132 if (addr + count > DS2760_DATA_SIZE) 133 count = DS2760_DATA_SIZE - addr; 134 135 if (!w1_reset_select_slave(sl)) { 136 if (!io) { 137 w1_write_8(sl->master, W1_DS2760_READ_DATA); 138 w1_write_8(sl->master, addr); 139 count = w1_read_block(sl->master, buf, count); 140 } else { 141 w1_write_8(sl->master, W1_DS2760_WRITE_DATA); 142 w1_write_8(sl->master, addr); 143 w1_write_block(sl->master, buf, count); 144 /* XXX w1_write_block returns void, not n_written */ 145 } 146 } 147 148 out: 149 mutex_unlock(&sl->master->bus_mutex); 150 151 return count; 152 } 153 154 static int w1_ds2760_read(struct device *dev, 155 char *buf, int addr, 156 size_t count) 157 { 158 return w1_ds2760_io(dev, buf, addr, count, 0); 159 } 160 161 static int w1_ds2760_write(struct device *dev, 162 char *buf, 163 int addr, size_t count) 164 { 165 return w1_ds2760_io(dev, buf, addr, count, 1); 166 } 167 168 static int w1_ds2760_eeprom_cmd(struct device *dev, int addr, int cmd) 169 { 170 struct w1_slave *sl = container_of(dev, struct w1_slave, dev); 171 172 if (!dev) 173 return -EINVAL; 174 175 mutex_lock(&sl->master->bus_mutex); 176 177 if (w1_reset_select_slave(sl) == 0) { 178 w1_write_8(sl->master, cmd); 179 w1_write_8(sl->master, addr); 180 } 181 182 mutex_unlock(&sl->master->bus_mutex); 183 return 0; 184 } 185 186 static int w1_ds2760_store_eeprom(struct device *dev, int addr) 187 { 188 return w1_ds2760_eeprom_cmd(dev, addr, W1_DS2760_COPY_DATA); 189 } 190 191 static int w1_ds2760_recall_eeprom(struct device *dev, int addr) 192 { 193 return w1_ds2760_eeprom_cmd(dev, addr, W1_DS2760_RECALL_DATA); 194 } 195 196 static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj, 197 const struct bin_attribute *bin_attr, char *buf, 198 loff_t off, size_t count) 199 { 200 struct device *dev = kobj_to_dev(kobj); 201 return w1_ds2760_read(dev, buf, off, count); 202 } 203 204 static const BIN_ATTR_RO(w1_slave, DS2760_DATA_SIZE); 205 206 static const struct bin_attribute *const w1_ds2760_bin_attrs[] = { 207 &bin_attr_w1_slave, 208 NULL, 209 }; 210 211 static const struct attribute_group w1_ds2760_group = { 212 .bin_attrs = w1_ds2760_bin_attrs, 213 }; 214 215 static const struct attribute_group *w1_ds2760_groups[] = { 216 &w1_ds2760_group, 217 NULL, 218 }; 219 /* Some batteries have their rated capacity stored a N * 10 mAh, while 220 * others use an index into this table. */ 221 static int rated_capacities[] = { 222 0, 223 920, /* Samsung */ 224 920, /* BYD */ 225 920, /* Lishen */ 226 920, /* NEC */ 227 1440, /* Samsung */ 228 1440, /* BYD */ 229 1440, /* Lishen */ 230 1440, /* NEC */ 231 2880, /* Samsung */ 232 2880, /* BYD */ 233 2880, /* Lishen */ 234 2880, /* NEC */ 235 }; 236 237 /* array is level at temps 0°C, 10°C, 20°C, 30°C, 40°C 238 * temp is in Celsius */ 239 static int battery_interpolate(int array[], int temp) 240 { 241 int index, dt; 242 243 if (temp <= 0) 244 return array[0]; 245 if (temp >= 40) 246 return array[4]; 247 248 index = temp / 10; 249 dt = temp % 10; 250 251 return array[index] + (((array[index + 1] - array[index]) * dt) / 10); 252 } 253 254 static int ds2760_battery_read_status(struct ds2760_device_info *di) 255 { 256 int ret, i, start, count, scale[5]; 257 258 if (di->update_time && time_before(jiffies, di->update_time + 259 msecs_to_jiffies(cache_time))) 260 return 0; 261 262 /* The first time we read the entire contents of SRAM/EEPROM, 263 * but after that we just read the interesting bits that change. */ 264 if (di->update_time == 0) { 265 start = 0; 266 count = DS2760_DATA_SIZE; 267 } else { 268 start = DS2760_VOLTAGE_MSB; 269 count = DS2760_TEMP_LSB - start + 1; 270 } 271 272 ret = w1_ds2760_read(di->dev, di->raw + start, start, count); 273 if (ret != count) { 274 dev_warn(di->dev, "call to w1_ds2760_read failed (0x%p)\n", 275 di->dev); 276 return 1; 277 } 278 279 di->update_time = jiffies; 280 281 /* DS2760 reports voltage in units of 4.88mV, but the battery class 282 * reports in units of uV, so convert by multiplying by 4880. */ 283 di->voltage_raw = (di->raw[DS2760_VOLTAGE_MSB] << 3) | 284 (di->raw[DS2760_VOLTAGE_LSB] >> 5); 285 di->voltage_uV = di->voltage_raw * 4880; 286 287 /* DS2760 reports current in signed units of 0.625mA, but the battery 288 * class reports in units of µA, so convert by multiplying by 625. */ 289 di->current_raw = 290 (((signed char)di->raw[DS2760_CURRENT_MSB]) << 5) | 291 (di->raw[DS2760_CURRENT_LSB] >> 3); 292 di->current_uA = di->current_raw * 625; 293 294 /* DS2760 reports accumulated current in signed units of 0.25mAh. */ 295 di->accum_current_raw = 296 (((signed char)di->raw[DS2760_CURRENT_ACCUM_MSB]) << 8) | 297 di->raw[DS2760_CURRENT_ACCUM_LSB]; 298 di->accum_current_uAh = di->accum_current_raw * 250; 299 300 /* DS2760 reports temperature in signed units of 0.125°C, but the 301 * battery class reports in units of 1/10 °C, so we convert by 302 * multiplying by .125 * 10 = 1.25. */ 303 di->temp_raw = (((signed char)di->raw[DS2760_TEMP_MSB]) << 3) | 304 (di->raw[DS2760_TEMP_LSB] >> 5); 305 di->temp_C = di->temp_raw + (di->temp_raw / 4); 306 307 /* At least some battery monitors (e.g. HP iPAQ) store the battery's 308 * maximum rated capacity. */ 309 if (di->raw[DS2760_RATED_CAPACITY] < ARRAY_SIZE(rated_capacities)) 310 di->rated_capacity = rated_capacities[ 311 (unsigned int)di->raw[DS2760_RATED_CAPACITY]]; 312 else 313 di->rated_capacity = di->raw[DS2760_RATED_CAPACITY] * 10; 314 315 di->rated_capacity *= 1000; /* convert to µAh */ 316 317 /* Calculate the full level at the present temperature. */ 318 di->full_active_uAh = di->raw[DS2760_ACTIVE_FULL] << 8 | 319 di->raw[DS2760_ACTIVE_FULL + 1]; 320 321 /* If the full_active_uAh value is not given, fall back to the rated 322 * capacity. This is likely to happen when chips are not part of the 323 * battery pack and is therefore not bootstrapped. */ 324 if (di->full_active_uAh == 0) 325 di->full_active_uAh = di->rated_capacity / 1000L; 326 327 scale[0] = di->full_active_uAh; 328 for (i = 1; i < 5; i++) 329 scale[i] = scale[i - 1] + di->raw[DS2760_ACTIVE_FULL + 1 + i]; 330 331 di->full_active_uAh = battery_interpolate(scale, di->temp_C / 10); 332 di->full_active_uAh *= 1000; /* convert to µAh */ 333 334 /* Calculate the empty level at the present temperature. */ 335 scale[4] = di->raw[DS2760_ACTIVE_EMPTY + 4]; 336 for (i = 3; i >= 0; i--) 337 scale[i] = scale[i + 1] + di->raw[DS2760_ACTIVE_EMPTY + i]; 338 339 di->empty_uAh = battery_interpolate(scale, di->temp_C / 10); 340 di->empty_uAh *= 1000; /* convert to µAh */ 341 342 if (di->full_active_uAh == di->empty_uAh) 343 di->rem_capacity = 0; 344 else 345 /* From Maxim Application Note 131: remaining capacity = 346 * ((ICA - Empty Value) / (Full Value - Empty Value)) x 100% */ 347 di->rem_capacity = ((di->accum_current_uAh - di->empty_uAh) * 100L) / 348 (di->full_active_uAh - di->empty_uAh); 349 350 if (di->rem_capacity < 0) 351 di->rem_capacity = 0; 352 if (di->rem_capacity > 100) 353 di->rem_capacity = 100; 354 355 if (di->current_uA < -100L) 356 di->life_sec = -((di->accum_current_uAh - di->empty_uAh) * 36L) 357 / (di->current_uA / 100L); 358 else 359 di->life_sec = 0; 360 361 return 0; 362 } 363 364 static void ds2760_battery_set_current_accum(struct ds2760_device_info *di, 365 unsigned int acr_val) 366 { 367 unsigned char acr[2]; 368 369 /* acr is in units of 0.25 mAh */ 370 acr_val *= 4L; 371 acr_val /= 1000; 372 373 acr[0] = acr_val >> 8; 374 acr[1] = acr_val & 0xff; 375 376 if (w1_ds2760_write(di->dev, acr, DS2760_CURRENT_ACCUM_MSB, 2) < 2) 377 dev_warn(di->dev, "ACR write failed\n"); 378 } 379 380 static void ds2760_battery_update_status(struct ds2760_device_info *di) 381 { 382 int old_charge_status = di->charge_status; 383 384 ds2760_battery_read_status(di); 385 386 if (di->charge_status == POWER_SUPPLY_STATUS_UNKNOWN) 387 di->full_counter = 0; 388 389 if (power_supply_am_i_supplied(di->bat)) { 390 if (di->current_uA > 10000) { 391 di->charge_status = POWER_SUPPLY_STATUS_CHARGING; 392 di->full_counter = 0; 393 } else if (di->current_uA < -5000) { 394 if (di->charge_status != POWER_SUPPLY_STATUS_NOT_CHARGING) 395 dev_notice(di->dev, "not enough power to " 396 "charge\n"); 397 di->charge_status = POWER_SUPPLY_STATUS_NOT_CHARGING; 398 di->full_counter = 0; 399 } else if (di->current_uA < 10000 && 400 di->charge_status != POWER_SUPPLY_STATUS_FULL) { 401 402 /* Don't consider the battery to be full unless 403 * we've seen the current < 10 mA at least two 404 * consecutive times. */ 405 406 di->full_counter++; 407 408 if (di->full_counter < 2) { 409 di->charge_status = POWER_SUPPLY_STATUS_CHARGING; 410 } else { 411 di->charge_status = POWER_SUPPLY_STATUS_FULL; 412 ds2760_battery_set_current_accum(di, 413 di->full_active_uAh); 414 } 415 } 416 } else { 417 di->charge_status = POWER_SUPPLY_STATUS_DISCHARGING; 418 di->full_counter = 0; 419 } 420 421 if (di->charge_status != old_charge_status) 422 power_supply_changed(di->bat); 423 } 424 425 static void ds2760_battery_write_status(struct ds2760_device_info *di, 426 char status) 427 { 428 if (status == di->raw[DS2760_STATUS_REG]) 429 return; 430 431 w1_ds2760_write(di->dev, &status, DS2760_STATUS_WRITE_REG, 1); 432 w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK1); 433 w1_ds2760_recall_eeprom(di->dev, DS2760_EEPROM_BLOCK1); 434 } 435 436 static void ds2760_battery_write_rated_capacity(struct ds2760_device_info *di, 437 unsigned char rated_capacity) 438 { 439 if (rated_capacity == di->raw[DS2760_RATED_CAPACITY]) 440 return; 441 442 w1_ds2760_write(di->dev, &rated_capacity, DS2760_RATED_CAPACITY, 1); 443 w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK1); 444 w1_ds2760_recall_eeprom(di->dev, DS2760_EEPROM_BLOCK1); 445 } 446 447 static void ds2760_battery_write_active_full(struct ds2760_device_info *di, 448 int active_full) 449 { 450 unsigned char tmp[2] = { 451 active_full >> 8, 452 active_full & 0xff 453 }; 454 455 if (tmp[0] == di->raw[DS2760_ACTIVE_FULL] && 456 tmp[1] == di->raw[DS2760_ACTIVE_FULL + 1]) 457 return; 458 459 w1_ds2760_write(di->dev, tmp, DS2760_ACTIVE_FULL, sizeof(tmp)); 460 w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK0); 461 w1_ds2760_recall_eeprom(di->dev, DS2760_EEPROM_BLOCK0); 462 463 /* Write to the di->raw[] buffer directly - the DS2760_ACTIVE_FULL 464 * values won't be read back by ds2760_battery_read_status() */ 465 di->raw[DS2760_ACTIVE_FULL] = tmp[0]; 466 di->raw[DS2760_ACTIVE_FULL + 1] = tmp[1]; 467 } 468 469 static void ds2760_battery_work(struct work_struct *work) 470 { 471 struct ds2760_device_info *di = container_of(work, 472 struct ds2760_device_info, monitor_work.work); 473 const int interval = HZ * 60; 474 475 dev_dbg(di->dev, "%s\n", __func__); 476 477 ds2760_battery_update_status(di); 478 queue_delayed_work(di->monitor_wqueue, &di->monitor_work, interval); 479 } 480 481 static void ds2760_battery_external_power_changed(struct power_supply *psy) 482 { 483 struct ds2760_device_info *di = power_supply_get_drvdata(psy); 484 485 dev_dbg(di->dev, "%s\n", __func__); 486 487 mod_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ/10); 488 } 489 490 491 static int ds2760_battery_get_property(struct power_supply *psy, 492 enum power_supply_property psp, 493 union power_supply_propval *val) 494 { 495 struct ds2760_device_info *di = power_supply_get_drvdata(psy); 496 497 switch (psp) { 498 case POWER_SUPPLY_PROP_STATUS: 499 val->intval = di->charge_status; 500 return 0; 501 default: 502 break; 503 } 504 505 ds2760_battery_read_status(di); 506 507 switch (psp) { 508 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 509 val->intval = di->voltage_uV; 510 break; 511 case POWER_SUPPLY_PROP_CURRENT_NOW: 512 val->intval = di->current_uA; 513 break; 514 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 515 val->intval = di->rated_capacity; 516 break; 517 case POWER_SUPPLY_PROP_CHARGE_FULL: 518 val->intval = di->full_active_uAh; 519 break; 520 case POWER_SUPPLY_PROP_CHARGE_EMPTY: 521 val->intval = di->empty_uAh; 522 break; 523 case POWER_SUPPLY_PROP_CHARGE_NOW: 524 val->intval = di->accum_current_uAh; 525 break; 526 case POWER_SUPPLY_PROP_TEMP: 527 val->intval = di->temp_C; 528 break; 529 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW: 530 val->intval = di->life_sec; 531 break; 532 case POWER_SUPPLY_PROP_CAPACITY: 533 val->intval = di->rem_capacity; 534 break; 535 default: 536 return -EINVAL; 537 } 538 539 return 0; 540 } 541 542 static int ds2760_battery_set_property(struct power_supply *psy, 543 enum power_supply_property psp, 544 const union power_supply_propval *val) 545 { 546 struct ds2760_device_info *di = power_supply_get_drvdata(psy); 547 548 switch (psp) { 549 case POWER_SUPPLY_PROP_CHARGE_FULL: 550 /* the interface counts in uAh, convert the value */ 551 ds2760_battery_write_active_full(di, val->intval / 1000L); 552 break; 553 554 case POWER_SUPPLY_PROP_CHARGE_NOW: 555 /* ds2760_battery_set_current_accum() does the conversion */ 556 ds2760_battery_set_current_accum(di, val->intval); 557 break; 558 559 default: 560 return -EPERM; 561 } 562 563 return 0; 564 } 565 566 static int ds2760_battery_property_is_writeable(struct power_supply *psy, 567 enum power_supply_property psp) 568 { 569 switch (psp) { 570 case POWER_SUPPLY_PROP_CHARGE_FULL: 571 case POWER_SUPPLY_PROP_CHARGE_NOW: 572 return 1; 573 574 default: 575 break; 576 } 577 578 return 0; 579 } 580 581 static enum power_supply_property ds2760_battery_props[] = { 582 POWER_SUPPLY_PROP_STATUS, 583 POWER_SUPPLY_PROP_VOLTAGE_NOW, 584 POWER_SUPPLY_PROP_CURRENT_NOW, 585 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 586 POWER_SUPPLY_PROP_CHARGE_FULL, 587 POWER_SUPPLY_PROP_CHARGE_EMPTY, 588 POWER_SUPPLY_PROP_CHARGE_NOW, 589 POWER_SUPPLY_PROP_TEMP, 590 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW, 591 POWER_SUPPLY_PROP_CAPACITY, 592 }; 593 594 static int ds2760_pm_notifier(struct notifier_block *notifier, 595 unsigned long pm_event, 596 void *unused) 597 { 598 struct ds2760_device_info *di = 599 container_of(notifier, struct ds2760_device_info, pm_notifier); 600 601 switch (pm_event) { 602 case PM_HIBERNATION_PREPARE: 603 case PM_SUSPEND_PREPARE: 604 di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN; 605 break; 606 607 case PM_POST_RESTORE: 608 case PM_POST_HIBERNATION: 609 case PM_POST_SUSPEND: 610 di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN; 611 power_supply_changed(di->bat); 612 mod_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ); 613 614 break; 615 616 case PM_RESTORE_PREPARE: 617 default: 618 break; 619 } 620 621 return NOTIFY_DONE; 622 } 623 624 static int w1_ds2760_add_slave(struct w1_slave *sl) 625 { 626 struct power_supply_config psy_cfg = {}; 627 struct ds2760_device_info *di; 628 struct device *dev = &sl->dev; 629 int retval = 0; 630 char name[32]; 631 char status; 632 633 di = devm_kzalloc(dev, sizeof(*di), GFP_KERNEL); 634 if (!di) { 635 retval = -ENOMEM; 636 goto di_alloc_failed; 637 } 638 639 snprintf(name, sizeof(name), "ds2760-battery.%d", dev->id); 640 641 di->dev = dev; 642 di->bat_desc.name = name; 643 di->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY; 644 di->bat_desc.properties = ds2760_battery_props; 645 di->bat_desc.num_properties = ARRAY_SIZE(ds2760_battery_props); 646 di->bat_desc.get_property = ds2760_battery_get_property; 647 di->bat_desc.set_property = ds2760_battery_set_property; 648 di->bat_desc.property_is_writeable = 649 ds2760_battery_property_is_writeable; 650 di->bat_desc.external_power_changed = 651 ds2760_battery_external_power_changed; 652 653 psy_cfg.drv_data = di; 654 psy_cfg.fwnode = dev_fwnode(dev); 655 656 if (dev->of_node) { 657 u32 tmp; 658 659 if (!of_property_read_bool(dev->of_node, "maxim,pmod-enabled")) 660 pmod_enabled = true; 661 662 if (!of_property_read_u32(dev->of_node, 663 "maxim,cache-time-ms", &tmp)) 664 cache_time = tmp; 665 666 if (!of_property_read_u32(dev->of_node, 667 "rated-capacity-microamp-hours", 668 &tmp)) 669 rated_capacity = tmp / 10; /* property is in mAh */ 670 } 671 672 di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN; 673 674 sl->family_data = di; 675 676 /* enable sleep mode feature */ 677 ds2760_battery_read_status(di); 678 status = di->raw[DS2760_STATUS_REG]; 679 if (pmod_enabled) 680 status |= DS2760_STATUS_PMOD; 681 else 682 status &= ~DS2760_STATUS_PMOD; 683 684 ds2760_battery_write_status(di, status); 685 686 /* set rated capacity from module param or device tree */ 687 if (rated_capacity) 688 ds2760_battery_write_rated_capacity(di, rated_capacity); 689 690 /* set current accumulator if given as parameter. 691 * this should only be done for bootstrapping the value */ 692 if (current_accum) 693 ds2760_battery_set_current_accum(di, current_accum); 694 695 di->bat = devm_power_supply_register(dev, &di->bat_desc, &psy_cfg); 696 if (IS_ERR(di->bat)) { 697 dev_err(di->dev, "failed to register battery\n"); 698 retval = PTR_ERR(di->bat); 699 goto batt_failed; 700 } 701 702 INIT_DELAYED_WORK(&di->monitor_work, ds2760_battery_work); 703 di->monitor_wqueue = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM); 704 if (!di->monitor_wqueue) { 705 retval = -ESRCH; 706 goto workqueue_failed; 707 } 708 queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ * 1); 709 710 di->pm_notifier.notifier_call = ds2760_pm_notifier; 711 register_pm_notifier(&di->pm_notifier); 712 713 goto success; 714 715 workqueue_failed: 716 batt_failed: 717 di_alloc_failed: 718 success: 719 return retval; 720 } 721 722 static void w1_ds2760_remove_slave(struct w1_slave *sl) 723 { 724 struct ds2760_device_info *di = sl->family_data; 725 726 unregister_pm_notifier(&di->pm_notifier); 727 cancel_delayed_work_sync(&di->monitor_work); 728 destroy_workqueue(di->monitor_wqueue); 729 } 730 731 #ifdef CONFIG_OF 732 static const struct of_device_id w1_ds2760_of_ids[] = { 733 { .compatible = "maxim,ds2760" }, 734 {} 735 }; 736 #endif 737 738 static const struct w1_family_ops w1_ds2760_fops = { 739 .add_slave = w1_ds2760_add_slave, 740 .remove_slave = w1_ds2760_remove_slave, 741 .groups = w1_ds2760_groups, 742 }; 743 744 static struct w1_family w1_ds2760_family = { 745 .fid = W1_FAMILY_DS2760, 746 .fops = &w1_ds2760_fops, 747 .of_match_table = of_match_ptr(w1_ds2760_of_ids), 748 }; 749 module_w1_family(w1_ds2760_family); 750 751 MODULE_AUTHOR("Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>, " 752 "Matt Reimer <mreimer@vpop.net>, " 753 "Anton Vorontsov <cbou@mail.ru>"); 754 MODULE_DESCRIPTION("1-wire Driver Dallas 2760 battery monitor chip"); 755 MODULE_LICENSE("GPL"); 756 MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2760)); 757