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 31#include "../w1/w1.h" 32#include "../w1/slaves/w1_ds2760.h" 33 34struct ds2760_device_info { 35 struct device *dev; 36 37 /* DS2760 data, valid after calling ds2760_battery_read_status() */ 38 unsigned long update_time; /* jiffies when data read */ 39 char raw[DS2760_DATA_SIZE]; /* raw DS2760 data */ 40 int voltage_raw; /* units of 4.88 mV */ 41 int voltage_uV; /* units of µV */ 42 int current_raw; /* units of 0.625 mA */ 43 int current_uA; /* units of µA */ 44 int accum_current_raw; /* units of 0.25 mAh */ 45 int accum_current_uAh; /* units of µAh */ 46 int temp_raw; /* units of 0.125 °C */ 47 int temp_C; /* units of 0.1 °C */ 48 int rated_capacity; /* units of µAh */ 49 int rem_capacity; /* percentage */ 50 int full_active_uAh; /* units of µAh */ 51 int empty_uAh; /* units of µAh */ 52 int life_sec; /* units of seconds */ 53 int charge_status; /* POWER_SUPPLY_STATUS_* */ 54 55 int full_counter; 56 struct power_supply *bat; 57 struct power_supply_desc bat_desc; 58 struct device *w1_dev; 59 struct workqueue_struct *monitor_wqueue; 60 struct delayed_work monitor_work; 61 struct delayed_work set_charged_work; 62}; 63 64static unsigned int cache_time = 1000; 65module_param(cache_time, uint, 0644); 66MODULE_PARM_DESC(cache_time, "cache time in milliseconds"); 67 68static bool pmod_enabled; 69module_param(pmod_enabled, bool, 0644); 70MODULE_PARM_DESC(pmod_enabled, "PMOD enable bit"); 71 72static unsigned int rated_capacity; 73module_param(rated_capacity, uint, 0644); 74MODULE_PARM_DESC(rated_capacity, "rated battery capacity, 10*mAh or index"); 75 76static unsigned int current_accum; 77module_param(current_accum, uint, 0644); 78MODULE_PARM_DESC(current_accum, "current accumulator value"); 79 80/* Some batteries have their rated capacity stored a N * 10 mAh, while 81 * others use an index into this table. */ 82static int rated_capacities[] = { 83 0, 84 920, /* Samsung */ 85 920, /* BYD */ 86 920, /* Lishen */ 87 920, /* NEC */ 88 1440, /* Samsung */ 89 1440, /* BYD */ 90#ifdef CONFIG_MACH_H4700 91 1800, /* HP iPAQ hx4700 3.7V 1800mAh (359113-001) */ 92#else 93 1440, /* Lishen */ 94#endif 95 1440, /* NEC */ 96 2880, /* Samsung */ 97 2880, /* BYD */ 98 2880, /* Lishen */ 99 2880, /* NEC */ 100#ifdef CONFIG_MACH_H4700 101 0, 102 3600, /* HP iPAQ hx4700 3.7V 3600mAh (359114-001) */ 103#endif 104}; 105 106/* array is level at temps 0°C, 10°C, 20°C, 30°C, 40°C 107 * temp is in Celsius */ 108static int battery_interpolate(int array[], int temp) 109{ 110 int index, dt; 111 112 if (temp <= 0) 113 return array[0]; 114 if (temp >= 40) 115 return array[4]; 116 117 index = temp / 10; 118 dt = temp % 10; 119 120 return array[index] + (((array[index + 1] - array[index]) * dt) / 10); 121} 122 123static int ds2760_battery_read_status(struct ds2760_device_info *di) 124{ 125 int ret, i, start, count, scale[5]; 126 127 if (di->update_time && time_before(jiffies, di->update_time + 128 msecs_to_jiffies(cache_time))) 129 return 0; 130 131 /* The first time we read the entire contents of SRAM/EEPROM, 132 * but after that we just read the interesting bits that change. */ 133 if (di->update_time == 0) { 134 start = 0; 135 count = DS2760_DATA_SIZE; 136 } else { 137 start = DS2760_VOLTAGE_MSB; 138 count = DS2760_TEMP_LSB - start + 1; 139 } 140 141 ret = w1_ds2760_read(di->w1_dev, di->raw + start, start, count); 142 if (ret != count) { 143 dev_warn(di->dev, "call to w1_ds2760_read failed (0x%p)\n", 144 di->w1_dev); 145 return 1; 146 } 147 148 di->update_time = jiffies; 149 150 /* DS2760 reports voltage in units of 4.88mV, but the battery class 151 * reports in units of uV, so convert by multiplying by 4880. */ 152 di->voltage_raw = (di->raw[DS2760_VOLTAGE_MSB] << 3) | 153 (di->raw[DS2760_VOLTAGE_LSB] >> 5); 154 di->voltage_uV = di->voltage_raw * 4880; 155 156 /* DS2760 reports current in signed units of 0.625mA, but the battery 157 * class reports in units of µA, so convert by multiplying by 625. */ 158 di->current_raw = 159 (((signed char)di->raw[DS2760_CURRENT_MSB]) << 5) | 160 (di->raw[DS2760_CURRENT_LSB] >> 3); 161 di->current_uA = di->current_raw * 625; 162 163 /* DS2760 reports accumulated current in signed units of 0.25mAh. */ 164 di->accum_current_raw = 165 (((signed char)di->raw[DS2760_CURRENT_ACCUM_MSB]) << 8) | 166 di->raw[DS2760_CURRENT_ACCUM_LSB]; 167 di->accum_current_uAh = di->accum_current_raw * 250; 168 169 /* DS2760 reports temperature in signed units of 0.125°C, but the 170 * battery class reports in units of 1/10 °C, so we convert by 171 * multiplying by .125 * 10 = 1.25. */ 172 di->temp_raw = (((signed char)di->raw[DS2760_TEMP_MSB]) << 3) | 173 (di->raw[DS2760_TEMP_LSB] >> 5); 174 di->temp_C = di->temp_raw + (di->temp_raw / 4); 175 176 /* At least some battery monitors (e.g. HP iPAQ) store the battery's 177 * maximum rated capacity. */ 178 if (di->raw[DS2760_RATED_CAPACITY] < ARRAY_SIZE(rated_capacities)) 179 di->rated_capacity = rated_capacities[ 180 (unsigned int)di->raw[DS2760_RATED_CAPACITY]]; 181 else 182 di->rated_capacity = di->raw[DS2760_RATED_CAPACITY] * 10; 183 184 di->rated_capacity *= 1000; /* convert to µAh */ 185 186 /* Calculate the full level at the present temperature. */ 187 di->full_active_uAh = di->raw[DS2760_ACTIVE_FULL] << 8 | 188 di->raw[DS2760_ACTIVE_FULL + 1]; 189 190 /* If the full_active_uAh value is not given, fall back to the rated 191 * capacity. This is likely to happen when chips are not part of the 192 * battery pack and is therefore not bootstrapped. */ 193 if (di->full_active_uAh == 0) 194 di->full_active_uAh = di->rated_capacity / 1000L; 195 196 scale[0] = di->full_active_uAh; 197 for (i = 1; i < 5; i++) 198 scale[i] = scale[i - 1] + di->raw[DS2760_ACTIVE_FULL + 1 + i]; 199 200 di->full_active_uAh = battery_interpolate(scale, di->temp_C / 10); 201 di->full_active_uAh *= 1000; /* convert to µAh */ 202 203 /* Calculate the empty level at the present temperature. */ 204 scale[4] = di->raw[DS2760_ACTIVE_EMPTY + 4]; 205 for (i = 3; i >= 0; i--) 206 scale[i] = scale[i + 1] + di->raw[DS2760_ACTIVE_EMPTY + i]; 207 208 di->empty_uAh = battery_interpolate(scale, di->temp_C / 10); 209 di->empty_uAh *= 1000; /* convert to µAh */ 210 211 if (di->full_active_uAh == di->empty_uAh) 212 di->rem_capacity = 0; 213 else 214 /* From Maxim Application Note 131: remaining capacity = 215 * ((ICA - Empty Value) / (Full Value - Empty Value)) x 100% */ 216 di->rem_capacity = ((di->accum_current_uAh - di->empty_uAh) * 100L) / 217 (di->full_active_uAh - di->empty_uAh); 218 219 if (di->rem_capacity < 0) 220 di->rem_capacity = 0; 221 if (di->rem_capacity > 100) 222 di->rem_capacity = 100; 223 224 if (di->current_uA < -100L) 225 di->life_sec = -((di->accum_current_uAh - di->empty_uAh) * 36L) 226 / (di->current_uA / 100L); 227 else 228 di->life_sec = 0; 229 230 return 0; 231} 232 233static void ds2760_battery_set_current_accum(struct ds2760_device_info *di, 234 unsigned int acr_val) 235{ 236 unsigned char acr[2]; 237 238 /* acr is in units of 0.25 mAh */ 239 acr_val *= 4L; 240 acr_val /= 1000; 241 242 acr[0] = acr_val >> 8; 243 acr[1] = acr_val & 0xff; 244 245 if (w1_ds2760_write(di->w1_dev, acr, DS2760_CURRENT_ACCUM_MSB, 2) < 2) 246 dev_warn(di->dev, "ACR write failed\n"); 247} 248 249static void ds2760_battery_update_status(struct ds2760_device_info *di) 250{ 251 int old_charge_status = di->charge_status; 252 253 ds2760_battery_read_status(di); 254 255 if (di->charge_status == POWER_SUPPLY_STATUS_UNKNOWN) 256 di->full_counter = 0; 257 258 if (power_supply_am_i_supplied(di->bat)) { 259 if (di->current_uA > 10000) { 260 di->charge_status = POWER_SUPPLY_STATUS_CHARGING; 261 di->full_counter = 0; 262 } else if (di->current_uA < -5000) { 263 if (di->charge_status != POWER_SUPPLY_STATUS_NOT_CHARGING) 264 dev_notice(di->dev, "not enough power to " 265 "charge\n"); 266 di->charge_status = POWER_SUPPLY_STATUS_NOT_CHARGING; 267 di->full_counter = 0; 268 } else if (di->current_uA < 10000 && 269 di->charge_status != POWER_SUPPLY_STATUS_FULL) { 270 271 /* Don't consider the battery to be full unless 272 * we've seen the current < 10 mA at least two 273 * consecutive times. */ 274 275 di->full_counter++; 276 277 if (di->full_counter < 2) { 278 di->charge_status = POWER_SUPPLY_STATUS_CHARGING; 279 } else { 280 di->charge_status = POWER_SUPPLY_STATUS_FULL; 281 ds2760_battery_set_current_accum(di, 282 di->full_active_uAh); 283 } 284 } 285 } else { 286 di->charge_status = POWER_SUPPLY_STATUS_DISCHARGING; 287 di->full_counter = 0; 288 } 289 290 if (di->charge_status != old_charge_status) 291 power_supply_changed(di->bat); 292} 293 294static void ds2760_battery_write_status(struct ds2760_device_info *di, 295 char status) 296{ 297 if (status == di->raw[DS2760_STATUS_REG]) 298 return; 299 300 w1_ds2760_write(di->w1_dev, &status, DS2760_STATUS_WRITE_REG, 1); 301 w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); 302 w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); 303} 304 305static void ds2760_battery_write_rated_capacity(struct ds2760_device_info *di, 306 unsigned char rated_capacity) 307{ 308 if (rated_capacity == di->raw[DS2760_RATED_CAPACITY]) 309 return; 310 311 w1_ds2760_write(di->w1_dev, &rated_capacity, DS2760_RATED_CAPACITY, 1); 312 w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); 313 w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); 314} 315 316static void ds2760_battery_write_active_full(struct ds2760_device_info *di, 317 int active_full) 318{ 319 unsigned char tmp[2] = { 320 active_full >> 8, 321 active_full & 0xff 322 }; 323 324 if (tmp[0] == di->raw[DS2760_ACTIVE_FULL] && 325 tmp[1] == di->raw[DS2760_ACTIVE_FULL + 1]) 326 return; 327 328 w1_ds2760_write(di->w1_dev, tmp, DS2760_ACTIVE_FULL, sizeof(tmp)); 329 w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK0); 330 w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK0); 331 332 /* Write to the di->raw[] buffer directly - the DS2760_ACTIVE_FULL 333 * values won't be read back by ds2760_battery_read_status() */ 334 di->raw[DS2760_ACTIVE_FULL] = tmp[0]; 335 di->raw[DS2760_ACTIVE_FULL + 1] = tmp[1]; 336} 337 338static void ds2760_battery_work(struct work_struct *work) 339{ 340 struct ds2760_device_info *di = container_of(work, 341 struct ds2760_device_info, monitor_work.work); 342 const int interval = HZ * 60; 343 344 dev_dbg(di->dev, "%s\n", __func__); 345 346 ds2760_battery_update_status(di); 347 queue_delayed_work(di->monitor_wqueue, &di->monitor_work, interval); 348} 349 350static void ds2760_battery_external_power_changed(struct power_supply *psy) 351{ 352 struct ds2760_device_info *di = power_supply_get_drvdata(psy); 353 354 dev_dbg(di->dev, "%s\n", __func__); 355 356 mod_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ/10); 357} 358 359 360static void ds2760_battery_set_charged_work(struct work_struct *work) 361{ 362 char bias; 363 struct ds2760_device_info *di = container_of(work, 364 struct ds2760_device_info, set_charged_work.work); 365 366 dev_dbg(di->dev, "%s\n", __func__); 367 368 ds2760_battery_read_status(di); 369 370 /* When we get notified by external circuitry that the battery is 371 * considered fully charged now, we know that there is no current 372 * flow any more. However, the ds2760's internal current meter is 373 * too inaccurate to rely on - spec say something ~15% failure. 374 * Hence, we use the current offset bias register to compensate 375 * that error. 376 */ 377 378 if (!power_supply_am_i_supplied(di->bat)) 379 return; 380 381 bias = (signed char) di->current_raw + 382 (signed char) di->raw[DS2760_CURRENT_OFFSET_BIAS]; 383 384 dev_dbg(di->dev, "%s: bias = %d\n", __func__, bias); 385 386 w1_ds2760_write(di->w1_dev, &bias, DS2760_CURRENT_OFFSET_BIAS, 1); 387 w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); 388 w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); 389 390 /* Write to the di->raw[] buffer directly - the CURRENT_OFFSET_BIAS 391 * value won't be read back by ds2760_battery_read_status() */ 392 di->raw[DS2760_CURRENT_OFFSET_BIAS] = bias; 393} 394 395static void ds2760_battery_set_charged(struct power_supply *psy) 396{ 397 struct ds2760_device_info *di = power_supply_get_drvdata(psy); 398 399 /* postpone the actual work by 20 secs. This is for debouncing GPIO 400 * signals and to let the current value settle. See AN4188. */ 401 mod_delayed_work(di->monitor_wqueue, &di->set_charged_work, HZ * 20); 402} 403 404static int ds2760_battery_get_property(struct power_supply *psy, 405 enum power_supply_property psp, 406 union power_supply_propval *val) 407{ 408 struct ds2760_device_info *di = power_supply_get_drvdata(psy); 409 410 switch (psp) { 411 case POWER_SUPPLY_PROP_STATUS: 412 val->intval = di->charge_status; 413 return 0; 414 default: 415 break; 416 } 417 418 ds2760_battery_read_status(di); 419 420 switch (psp) { 421 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 422 val->intval = di->voltage_uV; 423 break; 424 case POWER_SUPPLY_PROP_CURRENT_NOW: 425 val->intval = di->current_uA; 426 break; 427 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 428 val->intval = di->rated_capacity; 429 break; 430 case POWER_SUPPLY_PROP_CHARGE_FULL: 431 val->intval = di->full_active_uAh; 432 break; 433 case POWER_SUPPLY_PROP_CHARGE_EMPTY: 434 val->intval = di->empty_uAh; 435 break; 436 case POWER_SUPPLY_PROP_CHARGE_NOW: 437 val->intval = di->accum_current_uAh; 438 break; 439 case POWER_SUPPLY_PROP_TEMP: 440 val->intval = di->temp_C; 441 break; 442 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW: 443 val->intval = di->life_sec; 444 break; 445 case POWER_SUPPLY_PROP_CAPACITY: 446 val->intval = di->rem_capacity; 447 break; 448 default: 449 return -EINVAL; 450 } 451 452 return 0; 453} 454 455static int ds2760_battery_set_property(struct power_supply *psy, 456 enum power_supply_property psp, 457 const union power_supply_propval *val) 458{ 459 struct ds2760_device_info *di = power_supply_get_drvdata(psy); 460 461 switch (psp) { 462 case POWER_SUPPLY_PROP_CHARGE_FULL: 463 /* the interface counts in uAh, convert the value */ 464 ds2760_battery_write_active_full(di, val->intval / 1000L); 465 break; 466 467 case POWER_SUPPLY_PROP_CHARGE_NOW: 468 /* ds2760_battery_set_current_accum() does the conversion */ 469 ds2760_battery_set_current_accum(di, val->intval); 470 break; 471 472 default: 473 return -EPERM; 474 } 475 476 return 0; 477} 478 479static int ds2760_battery_property_is_writeable(struct power_supply *psy, 480 enum power_supply_property psp) 481{ 482 switch (psp) { 483 case POWER_SUPPLY_PROP_CHARGE_FULL: 484 case POWER_SUPPLY_PROP_CHARGE_NOW: 485 return 1; 486 487 default: 488 break; 489 } 490 491 return 0; 492} 493 494static enum power_supply_property ds2760_battery_props[] = { 495 POWER_SUPPLY_PROP_STATUS, 496 POWER_SUPPLY_PROP_VOLTAGE_NOW, 497 POWER_SUPPLY_PROP_CURRENT_NOW, 498 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 499 POWER_SUPPLY_PROP_CHARGE_FULL, 500 POWER_SUPPLY_PROP_CHARGE_EMPTY, 501 POWER_SUPPLY_PROP_CHARGE_NOW, 502 POWER_SUPPLY_PROP_TEMP, 503 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW, 504 POWER_SUPPLY_PROP_CAPACITY, 505}; 506 507static int ds2760_battery_probe(struct platform_device *pdev) 508{ 509 struct power_supply_config psy_cfg = {}; 510 char status; 511 int retval = 0; 512 struct ds2760_device_info *di; 513 514 di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL); 515 if (!di) { 516 retval = -ENOMEM; 517 goto di_alloc_failed; 518 } 519 520 platform_set_drvdata(pdev, di); 521 522 di->dev = &pdev->dev; 523 di->w1_dev = pdev->dev.parent; 524 di->bat_desc.name = dev_name(&pdev->dev); 525 di->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY; 526 di->bat_desc.properties = ds2760_battery_props; 527 di->bat_desc.num_properties = ARRAY_SIZE(ds2760_battery_props); 528 di->bat_desc.get_property = ds2760_battery_get_property; 529 di->bat_desc.set_property = ds2760_battery_set_property; 530 di->bat_desc.property_is_writeable = 531 ds2760_battery_property_is_writeable; 532 di->bat_desc.set_charged = ds2760_battery_set_charged; 533 di->bat_desc.external_power_changed = 534 ds2760_battery_external_power_changed; 535 536 psy_cfg.drv_data = di; 537 538 di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN; 539 540 /* enable sleep mode feature */ 541 ds2760_battery_read_status(di); 542 status = di->raw[DS2760_STATUS_REG]; 543 if (pmod_enabled) 544 status |= DS2760_STATUS_PMOD; 545 else 546 status &= ~DS2760_STATUS_PMOD; 547 548 ds2760_battery_write_status(di, status); 549 550 /* set rated capacity from module param */ 551 if (rated_capacity) 552 ds2760_battery_write_rated_capacity(di, rated_capacity); 553 554 /* set current accumulator if given as parameter. 555 * this should only be done for bootstrapping the value */ 556 if (current_accum) 557 ds2760_battery_set_current_accum(di, current_accum); 558 559 di->bat = power_supply_register(&pdev->dev, &di->bat_desc, &psy_cfg); 560 if (IS_ERR(di->bat)) { 561 dev_err(di->dev, "failed to register battery\n"); 562 retval = PTR_ERR(di->bat); 563 goto batt_failed; 564 } 565 566 INIT_DELAYED_WORK(&di->monitor_work, ds2760_battery_work); 567 INIT_DELAYED_WORK(&di->set_charged_work, 568 ds2760_battery_set_charged_work); 569 di->monitor_wqueue = create_singlethread_workqueue(dev_name(&pdev->dev)); 570 if (!di->monitor_wqueue) { 571 retval = -ESRCH; 572 goto workqueue_failed; 573 } 574 queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ * 1); 575 576 goto success; 577 578workqueue_failed: 579 power_supply_unregister(di->bat); 580batt_failed: 581di_alloc_failed: 582success: 583 return retval; 584} 585 586static int ds2760_battery_remove(struct platform_device *pdev) 587{ 588 struct ds2760_device_info *di = platform_get_drvdata(pdev); 589 590 cancel_delayed_work_sync(&di->monitor_work); 591 cancel_delayed_work_sync(&di->set_charged_work); 592 destroy_workqueue(di->monitor_wqueue); 593 power_supply_unregister(di->bat); 594 595 return 0; 596} 597 598#ifdef CONFIG_PM 599 600static int ds2760_battery_suspend(struct platform_device *pdev, 601 pm_message_t state) 602{ 603 struct ds2760_device_info *di = platform_get_drvdata(pdev); 604 605 di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN; 606 607 return 0; 608} 609 610static int ds2760_battery_resume(struct platform_device *pdev) 611{ 612 struct ds2760_device_info *di = platform_get_drvdata(pdev); 613 614 di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN; 615 power_supply_changed(di->bat); 616 617 mod_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ); 618 619 return 0; 620} 621 622#else 623 624#define ds2760_battery_suspend NULL 625#define ds2760_battery_resume NULL 626 627#endif /* CONFIG_PM */ 628 629MODULE_ALIAS("platform:ds2760-battery"); 630 631static struct platform_driver ds2760_battery_driver = { 632 .driver = { 633 .name = "ds2760-battery", 634 }, 635 .probe = ds2760_battery_probe, 636 .remove = ds2760_battery_remove, 637 .suspend = ds2760_battery_suspend, 638 .resume = ds2760_battery_resume, 639}; 640 641module_platform_driver(ds2760_battery_driver); 642 643MODULE_LICENSE("GPL"); 644MODULE_AUTHOR("Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>, " 645 "Matt Reimer <mreimer@vpop.net>, " 646 "Anton Vorontsov <cbou@mail.ru>"); 647MODULE_DESCRIPTION("ds2760 battery driver"); 648