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 34static unsigned int cache_time = 1000; 35module_param(cache_time, uint, 0644); 36MODULE_PARM_DESC(cache_time, "cache time in milliseconds"); 37 38static bool pmod_enabled; 39module_param(pmod_enabled, bool, 0644); 40MODULE_PARM_DESC(pmod_enabled, "PMOD enable bit"); 41 42static unsigned int rated_capacity; 43module_param(rated_capacity, uint, 0644); 44MODULE_PARM_DESC(rated_capacity, "rated battery capacity, 10*mAh or index"); 45 46static unsigned int current_accum; 47module_param(current_accum, uint, 0644); 48MODULE_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 89struct 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 delayed_work set_charged_work; 116 struct notifier_block pm_notifier; 117}; 118 119static int w1_ds2760_io(struct device *dev, char *buf, int addr, size_t count, 120 int io) 121{ 122 struct w1_slave *sl = container_of(dev, struct w1_slave, dev); 123 124 if (!dev) 125 return 0; 126 127 mutex_lock(&sl->master->bus_mutex); 128 129 if (addr > DS2760_DATA_SIZE || addr < 0) { 130 count = 0; 131 goto out; 132 } 133 if (addr + count > DS2760_DATA_SIZE) 134 count = DS2760_DATA_SIZE - addr; 135 136 if (!w1_reset_select_slave(sl)) { 137 if (!io) { 138 w1_write_8(sl->master, W1_DS2760_READ_DATA); 139 w1_write_8(sl->master, addr); 140 count = w1_read_block(sl->master, buf, count); 141 } else { 142 w1_write_8(sl->master, W1_DS2760_WRITE_DATA); 143 w1_write_8(sl->master, addr); 144 w1_write_block(sl->master, buf, count); 145 /* XXX w1_write_block returns void, not n_written */ 146 } 147 } 148 149out: 150 mutex_unlock(&sl->master->bus_mutex); 151 152 return count; 153} 154 155static int w1_ds2760_read(struct device *dev, 156 char *buf, int addr, 157 size_t count) 158{ 159 return w1_ds2760_io(dev, buf, addr, count, 0); 160} 161 162static int w1_ds2760_write(struct device *dev, 163 char *buf, 164 int addr, size_t count) 165{ 166 return w1_ds2760_io(dev, buf, addr, count, 1); 167} 168 169static int w1_ds2760_eeprom_cmd(struct device *dev, int addr, int cmd) 170{ 171 struct w1_slave *sl = container_of(dev, struct w1_slave, dev); 172 173 if (!dev) 174 return -EINVAL; 175 176 mutex_lock(&sl->master->bus_mutex); 177 178 if (w1_reset_select_slave(sl) == 0) { 179 w1_write_8(sl->master, cmd); 180 w1_write_8(sl->master, addr); 181 } 182 183 mutex_unlock(&sl->master->bus_mutex); 184 return 0; 185} 186 187static int w1_ds2760_store_eeprom(struct device *dev, int addr) 188{ 189 return w1_ds2760_eeprom_cmd(dev, addr, W1_DS2760_COPY_DATA); 190} 191 192static int w1_ds2760_recall_eeprom(struct device *dev, int addr) 193{ 194 return w1_ds2760_eeprom_cmd(dev, addr, W1_DS2760_RECALL_DATA); 195} 196 197static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj, 198 struct bin_attribute *bin_attr, char *buf, 199 loff_t off, size_t count) 200{ 201 struct device *dev = container_of(kobj, struct device, kobj); 202 return w1_ds2760_read(dev, buf, off, count); 203} 204 205static BIN_ATTR_RO(w1_slave, DS2760_DATA_SIZE); 206 207static struct bin_attribute *w1_ds2760_bin_attrs[] = { 208 &bin_attr_w1_slave, 209 NULL, 210}; 211 212static const struct attribute_group w1_ds2760_group = { 213 .bin_attrs = w1_ds2760_bin_attrs, 214}; 215 216static const struct attribute_group *w1_ds2760_groups[] = { 217 &w1_ds2760_group, 218 NULL, 219}; 220/* Some batteries have their rated capacity stored a N * 10 mAh, while 221 * others use an index into this table. */ 222static int rated_capacities[] = { 223 0, 224 920, /* Samsung */ 225 920, /* BYD */ 226 920, /* Lishen */ 227 920, /* NEC */ 228 1440, /* Samsung */ 229 1440, /* BYD */ 230#ifdef CONFIG_MACH_H4700 231 1800, /* HP iPAQ hx4700 3.7V 1800mAh (359113-001) */ 232#else 233 1440, /* Lishen */ 234#endif 235 1440, /* NEC */ 236 2880, /* Samsung */ 237 2880, /* BYD */ 238 2880, /* Lishen */ 239 2880, /* NEC */ 240#ifdef CONFIG_MACH_H4700 241 0, 242 3600, /* HP iPAQ hx4700 3.7V 3600mAh (359114-001) */ 243#endif 244}; 245 246/* array is level at temps 0°C, 10°C, 20°C, 30°C, 40°C 247 * temp is in Celsius */ 248static int battery_interpolate(int array[], int temp) 249{ 250 int index, dt; 251 252 if (temp <= 0) 253 return array[0]; 254 if (temp >= 40) 255 return array[4]; 256 257 index = temp / 10; 258 dt = temp % 10; 259 260 return array[index] + (((array[index + 1] - array[index]) * dt) / 10); 261} 262 263static int ds2760_battery_read_status(struct ds2760_device_info *di) 264{ 265 int ret, i, start, count, scale[5]; 266 267 if (di->update_time && time_before(jiffies, di->update_time + 268 msecs_to_jiffies(cache_time))) 269 return 0; 270 271 /* The first time we read the entire contents of SRAM/EEPROM, 272 * but after that we just read the interesting bits that change. */ 273 if (di->update_time == 0) { 274 start = 0; 275 count = DS2760_DATA_SIZE; 276 } else { 277 start = DS2760_VOLTAGE_MSB; 278 count = DS2760_TEMP_LSB - start + 1; 279 } 280 281 ret = w1_ds2760_read(di->dev, di->raw + start, start, count); 282 if (ret != count) { 283 dev_warn(di->dev, "call to w1_ds2760_read failed (0x%p)\n", 284 di->dev); 285 return 1; 286 } 287 288 di->update_time = jiffies; 289 290 /* DS2760 reports voltage in units of 4.88mV, but the battery class 291 * reports in units of uV, so convert by multiplying by 4880. */ 292 di->voltage_raw = (di->raw[DS2760_VOLTAGE_MSB] << 3) | 293 (di->raw[DS2760_VOLTAGE_LSB] >> 5); 294 di->voltage_uV = di->voltage_raw * 4880; 295 296 /* DS2760 reports current in signed units of 0.625mA, but the battery 297 * class reports in units of µA, so convert by multiplying by 625. */ 298 di->current_raw = 299 (((signed char)di->raw[DS2760_CURRENT_MSB]) << 5) | 300 (di->raw[DS2760_CURRENT_LSB] >> 3); 301 di->current_uA = di->current_raw * 625; 302 303 /* DS2760 reports accumulated current in signed units of 0.25mAh. */ 304 di->accum_current_raw = 305 (((signed char)di->raw[DS2760_CURRENT_ACCUM_MSB]) << 8) | 306 di->raw[DS2760_CURRENT_ACCUM_LSB]; 307 di->accum_current_uAh = di->accum_current_raw * 250; 308 309 /* DS2760 reports temperature in signed units of 0.125°C, but the 310 * battery class reports in units of 1/10 °C, so we convert by 311 * multiplying by .125 * 10 = 1.25. */ 312 di->temp_raw = (((signed char)di->raw[DS2760_TEMP_MSB]) << 3) | 313 (di->raw[DS2760_TEMP_LSB] >> 5); 314 di->temp_C = di->temp_raw + (di->temp_raw / 4); 315 316 /* At least some battery monitors (e.g. HP iPAQ) store the battery's 317 * maximum rated capacity. */ 318 if (di->raw[DS2760_RATED_CAPACITY] < ARRAY_SIZE(rated_capacities)) 319 di->rated_capacity = rated_capacities[ 320 (unsigned int)di->raw[DS2760_RATED_CAPACITY]]; 321 else 322 di->rated_capacity = di->raw[DS2760_RATED_CAPACITY] * 10; 323 324 di->rated_capacity *= 1000; /* convert to µAh */ 325 326 /* Calculate the full level at the present temperature. */ 327 di->full_active_uAh = di->raw[DS2760_ACTIVE_FULL] << 8 | 328 di->raw[DS2760_ACTIVE_FULL + 1]; 329 330 /* If the full_active_uAh value is not given, fall back to the rated 331 * capacity. This is likely to happen when chips are not part of the 332 * battery pack and is therefore not bootstrapped. */ 333 if (di->full_active_uAh == 0) 334 di->full_active_uAh = di->rated_capacity / 1000L; 335 336 scale[0] = di->full_active_uAh; 337 for (i = 1; i < 5; i++) 338 scale[i] = scale[i - 1] + di->raw[DS2760_ACTIVE_FULL + 1 + i]; 339 340 di->full_active_uAh = battery_interpolate(scale, di->temp_C / 10); 341 di->full_active_uAh *= 1000; /* convert to µAh */ 342 343 /* Calculate the empty level at the present temperature. */ 344 scale[4] = di->raw[DS2760_ACTIVE_EMPTY + 4]; 345 for (i = 3; i >= 0; i--) 346 scale[i] = scale[i + 1] + di->raw[DS2760_ACTIVE_EMPTY + i]; 347 348 di->empty_uAh = battery_interpolate(scale, di->temp_C / 10); 349 di->empty_uAh *= 1000; /* convert to µAh */ 350 351 if (di->full_active_uAh == di->empty_uAh) 352 di->rem_capacity = 0; 353 else 354 /* From Maxim Application Note 131: remaining capacity = 355 * ((ICA - Empty Value) / (Full Value - Empty Value)) x 100% */ 356 di->rem_capacity = ((di->accum_current_uAh - di->empty_uAh) * 100L) / 357 (di->full_active_uAh - di->empty_uAh); 358 359 if (di->rem_capacity < 0) 360 di->rem_capacity = 0; 361 if (di->rem_capacity > 100) 362 di->rem_capacity = 100; 363 364 if (di->current_uA < -100L) 365 di->life_sec = -((di->accum_current_uAh - di->empty_uAh) * 36L) 366 / (di->current_uA / 100L); 367 else 368 di->life_sec = 0; 369 370 return 0; 371} 372 373static void ds2760_battery_set_current_accum(struct ds2760_device_info *di, 374 unsigned int acr_val) 375{ 376 unsigned char acr[2]; 377 378 /* acr is in units of 0.25 mAh */ 379 acr_val *= 4L; 380 acr_val /= 1000; 381 382 acr[0] = acr_val >> 8; 383 acr[1] = acr_val & 0xff; 384 385 if (w1_ds2760_write(di->dev, acr, DS2760_CURRENT_ACCUM_MSB, 2) < 2) 386 dev_warn(di->dev, "ACR write failed\n"); 387} 388 389static void ds2760_battery_update_status(struct ds2760_device_info *di) 390{ 391 int old_charge_status = di->charge_status; 392 393 ds2760_battery_read_status(di); 394 395 if (di->charge_status == POWER_SUPPLY_STATUS_UNKNOWN) 396 di->full_counter = 0; 397 398 if (power_supply_am_i_supplied(di->bat)) { 399 if (di->current_uA > 10000) { 400 di->charge_status = POWER_SUPPLY_STATUS_CHARGING; 401 di->full_counter = 0; 402 } else if (di->current_uA < -5000) { 403 if (di->charge_status != POWER_SUPPLY_STATUS_NOT_CHARGING) 404 dev_notice(di->dev, "not enough power to " 405 "charge\n"); 406 di->charge_status = POWER_SUPPLY_STATUS_NOT_CHARGING; 407 di->full_counter = 0; 408 } else if (di->current_uA < 10000 && 409 di->charge_status != POWER_SUPPLY_STATUS_FULL) { 410 411 /* Don't consider the battery to be full unless 412 * we've seen the current < 10 mA at least two 413 * consecutive times. */ 414 415 di->full_counter++; 416 417 if (di->full_counter < 2) { 418 di->charge_status = POWER_SUPPLY_STATUS_CHARGING; 419 } else { 420 di->charge_status = POWER_SUPPLY_STATUS_FULL; 421 ds2760_battery_set_current_accum(di, 422 di->full_active_uAh); 423 } 424 } 425 } else { 426 di->charge_status = POWER_SUPPLY_STATUS_DISCHARGING; 427 di->full_counter = 0; 428 } 429 430 if (di->charge_status != old_charge_status) 431 power_supply_changed(di->bat); 432} 433 434static void ds2760_battery_write_status(struct ds2760_device_info *di, 435 char status) 436{ 437 if (status == di->raw[DS2760_STATUS_REG]) 438 return; 439 440 w1_ds2760_write(di->dev, &status, DS2760_STATUS_WRITE_REG, 1); 441 w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK1); 442 w1_ds2760_recall_eeprom(di->dev, DS2760_EEPROM_BLOCK1); 443} 444 445static void ds2760_battery_write_rated_capacity(struct ds2760_device_info *di, 446 unsigned char rated_capacity) 447{ 448 if (rated_capacity == di->raw[DS2760_RATED_CAPACITY]) 449 return; 450 451 w1_ds2760_write(di->dev, &rated_capacity, DS2760_RATED_CAPACITY, 1); 452 w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK1); 453 w1_ds2760_recall_eeprom(di->dev, DS2760_EEPROM_BLOCK1); 454} 455 456static void ds2760_battery_write_active_full(struct ds2760_device_info *di, 457 int active_full) 458{ 459 unsigned char tmp[2] = { 460 active_full >> 8, 461 active_full & 0xff 462 }; 463 464 if (tmp[0] == di->raw[DS2760_ACTIVE_FULL] && 465 tmp[1] == di->raw[DS2760_ACTIVE_FULL + 1]) 466 return; 467 468 w1_ds2760_write(di->dev, tmp, DS2760_ACTIVE_FULL, sizeof(tmp)); 469 w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK0); 470 w1_ds2760_recall_eeprom(di->dev, DS2760_EEPROM_BLOCK0); 471 472 /* Write to the di->raw[] buffer directly - the DS2760_ACTIVE_FULL 473 * values won't be read back by ds2760_battery_read_status() */ 474 di->raw[DS2760_ACTIVE_FULL] = tmp[0]; 475 di->raw[DS2760_ACTIVE_FULL + 1] = tmp[1]; 476} 477 478static void ds2760_battery_work(struct work_struct *work) 479{ 480 struct ds2760_device_info *di = container_of(work, 481 struct ds2760_device_info, monitor_work.work); 482 const int interval = HZ * 60; 483 484 dev_dbg(di->dev, "%s\n", __func__); 485 486 ds2760_battery_update_status(di); 487 queue_delayed_work(di->monitor_wqueue, &di->monitor_work, interval); 488} 489 490static void ds2760_battery_external_power_changed(struct power_supply *psy) 491{ 492 struct ds2760_device_info *di = power_supply_get_drvdata(psy); 493 494 dev_dbg(di->dev, "%s\n", __func__); 495 496 mod_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ/10); 497} 498 499 500static void ds2760_battery_set_charged_work(struct work_struct *work) 501{ 502 char bias; 503 struct ds2760_device_info *di = container_of(work, 504 struct ds2760_device_info, set_charged_work.work); 505 506 dev_dbg(di->dev, "%s\n", __func__); 507 508 ds2760_battery_read_status(di); 509 510 /* When we get notified by external circuitry that the battery is 511 * considered fully charged now, we know that there is no current 512 * flow any more. However, the ds2760's internal current meter is 513 * too inaccurate to rely on - spec say something ~15% failure. 514 * Hence, we use the current offset bias register to compensate 515 * that error. 516 */ 517 518 if (!power_supply_am_i_supplied(di->bat)) 519 return; 520 521 bias = (signed char) di->current_raw + 522 (signed char) di->raw[DS2760_CURRENT_OFFSET_BIAS]; 523 524 dev_dbg(di->dev, "%s: bias = %d\n", __func__, bias); 525 526 w1_ds2760_write(di->dev, &bias, DS2760_CURRENT_OFFSET_BIAS, 1); 527 w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK1); 528 w1_ds2760_recall_eeprom(di->dev, DS2760_EEPROM_BLOCK1); 529 530 /* Write to the di->raw[] buffer directly - the CURRENT_OFFSET_BIAS 531 * value won't be read back by ds2760_battery_read_status() */ 532 di->raw[DS2760_CURRENT_OFFSET_BIAS] = bias; 533} 534 535static void ds2760_battery_set_charged(struct power_supply *psy) 536{ 537 struct ds2760_device_info *di = power_supply_get_drvdata(psy); 538 539 /* postpone the actual work by 20 secs. This is for debouncing GPIO 540 * signals and to let the current value settle. See AN4188. */ 541 mod_delayed_work(di->monitor_wqueue, &di->set_charged_work, HZ * 20); 542} 543 544static int ds2760_battery_get_property(struct power_supply *psy, 545 enum power_supply_property psp, 546 union power_supply_propval *val) 547{ 548 struct ds2760_device_info *di = power_supply_get_drvdata(psy); 549 550 switch (psp) { 551 case POWER_SUPPLY_PROP_STATUS: 552 val->intval = di->charge_status; 553 return 0; 554 default: 555 break; 556 } 557 558 ds2760_battery_read_status(di); 559 560 switch (psp) { 561 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 562 val->intval = di->voltage_uV; 563 break; 564 case POWER_SUPPLY_PROP_CURRENT_NOW: 565 val->intval = di->current_uA; 566 break; 567 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 568 val->intval = di->rated_capacity; 569 break; 570 case POWER_SUPPLY_PROP_CHARGE_FULL: 571 val->intval = di->full_active_uAh; 572 break; 573 case POWER_SUPPLY_PROP_CHARGE_EMPTY: 574 val->intval = di->empty_uAh; 575 break; 576 case POWER_SUPPLY_PROP_CHARGE_NOW: 577 val->intval = di->accum_current_uAh; 578 break; 579 case POWER_SUPPLY_PROP_TEMP: 580 val->intval = di->temp_C; 581 break; 582 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW: 583 val->intval = di->life_sec; 584 break; 585 case POWER_SUPPLY_PROP_CAPACITY: 586 val->intval = di->rem_capacity; 587 break; 588 default: 589 return -EINVAL; 590 } 591 592 return 0; 593} 594 595static int ds2760_battery_set_property(struct power_supply *psy, 596 enum power_supply_property psp, 597 const union power_supply_propval *val) 598{ 599 struct ds2760_device_info *di = power_supply_get_drvdata(psy); 600 601 switch (psp) { 602 case POWER_SUPPLY_PROP_CHARGE_FULL: 603 /* the interface counts in uAh, convert the value */ 604 ds2760_battery_write_active_full(di, val->intval / 1000L); 605 break; 606 607 case POWER_SUPPLY_PROP_CHARGE_NOW: 608 /* ds2760_battery_set_current_accum() does the conversion */ 609 ds2760_battery_set_current_accum(di, val->intval); 610 break; 611 612 default: 613 return -EPERM; 614 } 615 616 return 0; 617} 618 619static int ds2760_battery_property_is_writeable(struct power_supply *psy, 620 enum power_supply_property psp) 621{ 622 switch (psp) { 623 case POWER_SUPPLY_PROP_CHARGE_FULL: 624 case POWER_SUPPLY_PROP_CHARGE_NOW: 625 return 1; 626 627 default: 628 break; 629 } 630 631 return 0; 632} 633 634static enum power_supply_property ds2760_battery_props[] = { 635 POWER_SUPPLY_PROP_STATUS, 636 POWER_SUPPLY_PROP_VOLTAGE_NOW, 637 POWER_SUPPLY_PROP_CURRENT_NOW, 638 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 639 POWER_SUPPLY_PROP_CHARGE_FULL, 640 POWER_SUPPLY_PROP_CHARGE_EMPTY, 641 POWER_SUPPLY_PROP_CHARGE_NOW, 642 POWER_SUPPLY_PROP_TEMP, 643 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW, 644 POWER_SUPPLY_PROP_CAPACITY, 645}; 646 647static int ds2760_pm_notifier(struct notifier_block *notifier, 648 unsigned long pm_event, 649 void *unused) 650{ 651 struct ds2760_device_info *di = 652 container_of(notifier, struct ds2760_device_info, pm_notifier); 653 654 switch (pm_event) { 655 case PM_HIBERNATION_PREPARE: 656 case PM_SUSPEND_PREPARE: 657 di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN; 658 break; 659 660 case PM_POST_RESTORE: 661 case PM_POST_HIBERNATION: 662 case PM_POST_SUSPEND: 663 di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN; 664 power_supply_changed(di->bat); 665 mod_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ); 666 667 break; 668 669 case PM_RESTORE_PREPARE: 670 default: 671 break; 672 } 673 674 return NOTIFY_DONE; 675} 676 677static int w1_ds2760_add_slave(struct w1_slave *sl) 678{ 679 struct power_supply_config psy_cfg = {}; 680 struct ds2760_device_info *di; 681 struct device *dev = &sl->dev; 682 int retval = 0; 683 char name[32]; 684 char status; 685 686 di = devm_kzalloc(dev, sizeof(*di), GFP_KERNEL); 687 if (!di) { 688 retval = -ENOMEM; 689 goto di_alloc_failed; 690 } 691 692 snprintf(name, sizeof(name), "ds2760-battery.%d", dev->id); 693 694 di->dev = dev; 695 di->bat_desc.name = name; 696 di->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY; 697 di->bat_desc.properties = ds2760_battery_props; 698 di->bat_desc.num_properties = ARRAY_SIZE(ds2760_battery_props); 699 di->bat_desc.get_property = ds2760_battery_get_property; 700 di->bat_desc.set_property = ds2760_battery_set_property; 701 di->bat_desc.property_is_writeable = 702 ds2760_battery_property_is_writeable; 703 di->bat_desc.set_charged = ds2760_battery_set_charged; 704 di->bat_desc.external_power_changed = 705 ds2760_battery_external_power_changed; 706 707 psy_cfg.drv_data = di; 708 709 if (dev->of_node) { 710 u32 tmp; 711 712 psy_cfg.of_node = dev->of_node; 713 714 if (!of_property_read_bool(dev->of_node, "maxim,pmod-enabled")) 715 pmod_enabled = true; 716 717 if (!of_property_read_u32(dev->of_node, 718 "maxim,cache-time-ms", &tmp)) 719 cache_time = tmp; 720 721 if (!of_property_read_u32(dev->of_node, 722 "rated-capacity-microamp-hours", 723 &tmp)) 724 rated_capacity = tmp / 10; /* property is in mAh */ 725 } 726 727 di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN; 728 729 sl->family_data = di; 730 731 /* enable sleep mode feature */ 732 ds2760_battery_read_status(di); 733 status = di->raw[DS2760_STATUS_REG]; 734 if (pmod_enabled) 735 status |= DS2760_STATUS_PMOD; 736 else 737 status &= ~DS2760_STATUS_PMOD; 738 739 ds2760_battery_write_status(di, status); 740 741 /* set rated capacity from module param or device tree */ 742 if (rated_capacity) 743 ds2760_battery_write_rated_capacity(di, rated_capacity); 744 745 /* set current accumulator if given as parameter. 746 * this should only be done for bootstrapping the value */ 747 if (current_accum) 748 ds2760_battery_set_current_accum(di, current_accum); 749 750 di->bat = power_supply_register(dev, &di->bat_desc, &psy_cfg); 751 if (IS_ERR(di->bat)) { 752 dev_err(di->dev, "failed to register battery\n"); 753 retval = PTR_ERR(di->bat); 754 goto batt_failed; 755 } 756 757 INIT_DELAYED_WORK(&di->monitor_work, ds2760_battery_work); 758 INIT_DELAYED_WORK(&di->set_charged_work, 759 ds2760_battery_set_charged_work); 760 di->monitor_wqueue = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM); 761 if (!di->monitor_wqueue) { 762 retval = -ESRCH; 763 goto workqueue_failed; 764 } 765 queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ * 1); 766 767 di->pm_notifier.notifier_call = ds2760_pm_notifier; 768 register_pm_notifier(&di->pm_notifier); 769 770 goto success; 771 772workqueue_failed: 773 power_supply_unregister(di->bat); 774batt_failed: 775di_alloc_failed: 776success: 777 return retval; 778} 779 780static void w1_ds2760_remove_slave(struct w1_slave *sl) 781{ 782 struct ds2760_device_info *di = sl->family_data; 783 784 unregister_pm_notifier(&di->pm_notifier); 785 cancel_delayed_work_sync(&di->monitor_work); 786 cancel_delayed_work_sync(&di->set_charged_work); 787 destroy_workqueue(di->monitor_wqueue); 788 power_supply_unregister(di->bat); 789} 790 791#ifdef CONFIG_OF 792static const struct of_device_id w1_ds2760_of_ids[] = { 793 { .compatible = "maxim,ds2760" }, 794 {} 795}; 796#endif 797 798static const struct w1_family_ops w1_ds2760_fops = { 799 .add_slave = w1_ds2760_add_slave, 800 .remove_slave = w1_ds2760_remove_slave, 801 .groups = w1_ds2760_groups, 802}; 803 804static struct w1_family w1_ds2760_family = { 805 .fid = W1_FAMILY_DS2760, 806 .fops = &w1_ds2760_fops, 807 .of_match_table = of_match_ptr(w1_ds2760_of_ids), 808}; 809module_w1_family(w1_ds2760_family); 810 811MODULE_AUTHOR("Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>, " 812 "Matt Reimer <mreimer@vpop.net>, " 813 "Anton Vorontsov <cbou@mail.ru>"); 814MODULE_DESCRIPTION("1-wire Driver Dallas 2760 battery monitor chip"); 815MODULE_LICENSE("GPL"); 816MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2760)); 817