ds2760_battery.c revision bd52ca555ef36bf5b790178cfe8b7d42b5c16ca6
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 device *w1_dev; 58 struct workqueue_struct *monitor_wqueue; 59 struct delayed_work monitor_work; 60 struct delayed_work set_charged_work; 61}; 62 63static unsigned int cache_time = 1000; 64module_param(cache_time, uint, 0644); 65MODULE_PARM_DESC(cache_time, "cache time in milliseconds"); 66 67static unsigned int pmod_enabled; 68module_param(pmod_enabled, bool, 0644); 69MODULE_PARM_DESC(pmod_enabled, "PMOD enable bit"); 70 71static unsigned int rated_capacity; 72module_param(rated_capacity, uint, 0644); 73MODULE_PARM_DESC(rated_capacity, "rated battery capacity, 10*mAh or index"); 74 75static unsigned int current_accum; 76module_param(current_accum, uint, 0644); 77MODULE_PARM_DESC(current_accum, "current accumulator value"); 78 79/* Some batteries have their rated capacity stored a N * 10 mAh, while 80 * others use an index into this table. */ 81static int rated_capacities[] = { 82 0, 83 920, /* Samsung */ 84 920, /* BYD */ 85 920, /* Lishen */ 86 920, /* NEC */ 87 1440, /* Samsung */ 88 1440, /* BYD */ 89 1440, /* Lishen */ 90 1440, /* NEC */ 91 2880, /* Samsung */ 92 2880, /* BYD */ 93 2880, /* Lishen */ 94 2880 /* NEC */ 95}; 96 97/* array is level at temps 0°C, 10°C, 20°C, 30°C, 40°C 98 * temp is in Celsius */ 99static int battery_interpolate(int array[], int temp) 100{ 101 int index, dt; 102 103 if (temp <= 0) 104 return array[0]; 105 if (temp >= 40) 106 return array[4]; 107 108 index = temp / 10; 109 dt = temp % 10; 110 111 return array[index] + (((array[index + 1] - array[index]) * dt) / 10); 112} 113 114static int ds2760_battery_read_status(struct ds2760_device_info *di) 115{ 116 int ret, i, start, count, scale[5]; 117 118 if (di->update_time && time_before(jiffies, di->update_time + 119 msecs_to_jiffies(cache_time))) 120 return 0; 121 122 /* The first time we read the entire contents of SRAM/EEPROM, 123 * but after that we just read the interesting bits that change. */ 124 if (di->update_time == 0) { 125 start = 0; 126 count = DS2760_DATA_SIZE; 127 } else { 128 start = DS2760_VOLTAGE_MSB; 129 count = DS2760_TEMP_LSB - start + 1; 130 } 131 132 ret = w1_ds2760_read(di->w1_dev, di->raw + start, start, count); 133 if (ret != count) { 134 dev_warn(di->dev, "call to w1_ds2760_read failed (0x%p)\n", 135 di->w1_dev); 136 return 1; 137 } 138 139 di->update_time = jiffies; 140 141 /* DS2760 reports voltage in units of 4.88mV, but the battery class 142 * reports in units of uV, so convert by multiplying by 4880. */ 143 di->voltage_raw = (di->raw[DS2760_VOLTAGE_MSB] << 3) | 144 (di->raw[DS2760_VOLTAGE_LSB] >> 5); 145 di->voltage_uV = di->voltage_raw * 4880; 146 147 /* DS2760 reports current in signed units of 0.625mA, but the battery 148 * class reports in units of µA, so convert by multiplying by 625. */ 149 di->current_raw = 150 (((signed char)di->raw[DS2760_CURRENT_MSB]) << 5) | 151 (di->raw[DS2760_CURRENT_LSB] >> 3); 152 di->current_uA = di->current_raw * 625; 153 154 /* DS2760 reports accumulated current in signed units of 0.25mAh. */ 155 di->accum_current_raw = 156 (((signed char)di->raw[DS2760_CURRENT_ACCUM_MSB]) << 8) | 157 di->raw[DS2760_CURRENT_ACCUM_LSB]; 158 di->accum_current_uAh = di->accum_current_raw * 250; 159 160 /* DS2760 reports temperature in signed units of 0.125°C, but the 161 * battery class reports in units of 1/10 °C, so we convert by 162 * multiplying by .125 * 10 = 1.25. */ 163 di->temp_raw = (((signed char)di->raw[DS2760_TEMP_MSB]) << 3) | 164 (di->raw[DS2760_TEMP_LSB] >> 5); 165 di->temp_C = di->temp_raw + (di->temp_raw / 4); 166 167 /* At least some battery monitors (e.g. HP iPAQ) store the battery's 168 * maximum rated capacity. */ 169 if (di->raw[DS2760_RATED_CAPACITY] < ARRAY_SIZE(rated_capacities)) 170 di->rated_capacity = rated_capacities[ 171 (unsigned int)di->raw[DS2760_RATED_CAPACITY]]; 172 else 173 di->rated_capacity = di->raw[DS2760_RATED_CAPACITY] * 10; 174 175 di->rated_capacity *= 1000; /* convert to µAh */ 176 177 /* Calculate the full level at the present temperature. */ 178 di->full_active_uAh = di->raw[DS2760_ACTIVE_FULL] << 8 | 179 di->raw[DS2760_ACTIVE_FULL + 1]; 180 181 /* If the full_active_uAh value is not given, fall back to the rated 182 * capacity. This is likely to happen when chips are not part of the 183 * battery pack and is therefore not bootstrapped. */ 184 if (di->full_active_uAh == 0) 185 di->full_active_uAh = di->rated_capacity / 1000L; 186 187 scale[0] = di->full_active_uAh; 188 for (i = 1; i < 5; i++) 189 scale[i] = scale[i - 1] + di->raw[DS2760_ACTIVE_FULL + 2 + i]; 190 191 di->full_active_uAh = battery_interpolate(scale, di->temp_C / 10); 192 di->full_active_uAh *= 1000; /* convert to µAh */ 193 194 /* Calculate the empty level at the present temperature. */ 195 scale[4] = di->raw[DS2760_ACTIVE_EMPTY + 4]; 196 for (i = 3; i >= 0; i--) 197 scale[i] = scale[i + 1] + di->raw[DS2760_ACTIVE_EMPTY + i]; 198 199 di->empty_uAh = battery_interpolate(scale, di->temp_C / 10); 200 di->empty_uAh *= 1000; /* convert to µAh */ 201 202 if (di->full_active_uAh == di->empty_uAh) 203 di->rem_capacity = 0; 204 else 205 /* From Maxim Application Note 131: remaining capacity = 206 * ((ICA - Empty Value) / (Full Value - Empty Value)) x 100% */ 207 di->rem_capacity = ((di->accum_current_uAh - di->empty_uAh) * 100L) / 208 (di->full_active_uAh - di->empty_uAh); 209 210 if (di->rem_capacity < 0) 211 di->rem_capacity = 0; 212 if (di->rem_capacity > 100) 213 di->rem_capacity = 100; 214 215 if (di->current_uA >= 100L) 216 di->life_sec = -((di->accum_current_uAh - di->empty_uAh) * 36L) 217 / (di->current_uA / 100L); 218 else 219 di->life_sec = 0; 220 221 return 0; 222} 223 224static void ds2760_battery_set_current_accum(struct ds2760_device_info *di, 225 unsigned int acr_val) 226{ 227 unsigned char acr[2]; 228 229 /* acr is in units of 0.25 mAh */ 230 acr_val *= 4L; 231 acr_val /= 1000; 232 233 acr[0] = acr_val >> 8; 234 acr[1] = acr_val & 0xff; 235 236 if (w1_ds2760_write(di->w1_dev, acr, DS2760_CURRENT_ACCUM_MSB, 2) < 2) 237 dev_warn(di->dev, "ACR write failed\n"); 238} 239 240static void ds2760_battery_update_status(struct ds2760_device_info *di) 241{ 242 int old_charge_status = di->charge_status; 243 244 ds2760_battery_read_status(di); 245 246 if (di->charge_status == POWER_SUPPLY_STATUS_UNKNOWN) 247 di->full_counter = 0; 248 249 if (power_supply_am_i_supplied(&di->bat)) { 250 if (di->current_uA > 10000) { 251 di->charge_status = POWER_SUPPLY_STATUS_CHARGING; 252 di->full_counter = 0; 253 } else if (di->current_uA < -5000) { 254 if (di->charge_status != POWER_SUPPLY_STATUS_NOT_CHARGING) 255 dev_notice(di->dev, "not enough power to " 256 "charge\n"); 257 di->charge_status = POWER_SUPPLY_STATUS_NOT_CHARGING; 258 di->full_counter = 0; 259 } else if (di->current_uA < 10000 && 260 di->charge_status != POWER_SUPPLY_STATUS_FULL) { 261 262 /* Don't consider the battery to be full unless 263 * we've seen the current < 10 mA at least two 264 * consecutive times. */ 265 266 di->full_counter++; 267 268 if (di->full_counter < 2) { 269 di->charge_status = POWER_SUPPLY_STATUS_CHARGING; 270 } else { 271 di->charge_status = POWER_SUPPLY_STATUS_FULL; 272 ds2760_battery_set_current_accum(di, 273 di->full_active_uAh); 274 } 275 } 276 } else { 277 di->charge_status = POWER_SUPPLY_STATUS_DISCHARGING; 278 di->full_counter = 0; 279 } 280 281 if (di->charge_status != old_charge_status) 282 power_supply_changed(&di->bat); 283} 284 285static void ds2760_battery_write_status(struct ds2760_device_info *di, 286 char status) 287{ 288 if (status == di->raw[DS2760_STATUS_REG]) 289 return; 290 291 w1_ds2760_write(di->w1_dev, &status, DS2760_STATUS_WRITE_REG, 1); 292 w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); 293 w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); 294} 295 296static void ds2760_battery_write_rated_capacity(struct ds2760_device_info *di, 297 unsigned char rated_capacity) 298{ 299 if (rated_capacity == di->raw[DS2760_RATED_CAPACITY]) 300 return; 301 302 w1_ds2760_write(di->w1_dev, &rated_capacity, DS2760_RATED_CAPACITY, 1); 303 w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); 304 w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); 305} 306 307static void ds2760_battery_write_active_full(struct ds2760_device_info *di, 308 int active_full) 309{ 310 unsigned char tmp[2] = { 311 active_full >> 8, 312 active_full & 0xff 313 }; 314 315 if (tmp[0] == di->raw[DS2760_ACTIVE_FULL] && 316 tmp[1] == di->raw[DS2760_ACTIVE_FULL + 1]) 317 return; 318 319 w1_ds2760_write(di->w1_dev, tmp, DS2760_ACTIVE_FULL, sizeof(tmp)); 320 w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK0); 321 w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK0); 322 323 /* Write to the di->raw[] buffer directly - the DS2760_ACTIVE_FULL 324 * values won't be read back by ds2760_battery_read_status() */ 325 di->raw[DS2760_ACTIVE_FULL] = tmp[0]; 326 di->raw[DS2760_ACTIVE_FULL + 1] = tmp[1]; 327} 328 329static void ds2760_battery_work(struct work_struct *work) 330{ 331 struct ds2760_device_info *di = container_of(work, 332 struct ds2760_device_info, monitor_work.work); 333 const int interval = HZ * 60; 334 335 dev_dbg(di->dev, "%s\n", __func__); 336 337 ds2760_battery_update_status(di); 338 queue_delayed_work(di->monitor_wqueue, &di->monitor_work, interval); 339} 340 341#define to_ds2760_device_info(x) container_of((x), struct ds2760_device_info, \ 342 bat); 343 344static void ds2760_battery_external_power_changed(struct power_supply *psy) 345{ 346 struct ds2760_device_info *di = to_ds2760_device_info(psy); 347 348 dev_dbg(di->dev, "%s\n", __func__); 349 350 cancel_delayed_work(&di->monitor_work); 351 queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ/10); 352} 353 354 355static void ds2760_battery_set_charged_work(struct work_struct *work) 356{ 357 char bias; 358 struct ds2760_device_info *di = container_of(work, 359 struct ds2760_device_info, set_charged_work.work); 360 361 dev_dbg(di->dev, "%s\n", __func__); 362 363 ds2760_battery_read_status(di); 364 365 /* When we get notified by external circuitry that the battery is 366 * considered fully charged now, we know that there is no current 367 * flow any more. However, the ds2760's internal current meter is 368 * too inaccurate to rely on - spec say something ~15% failure. 369 * Hence, we use the current offset bias register to compensate 370 * that error. 371 */ 372 373 if (!power_supply_am_i_supplied(&di->bat)) 374 return; 375 376 bias = (signed char) di->current_raw + 377 (signed char) di->raw[DS2760_CURRENT_OFFSET_BIAS]; 378 379 dev_dbg(di->dev, "%s: bias = %d\n", __func__, bias); 380 381 w1_ds2760_write(di->w1_dev, &bias, DS2760_CURRENT_OFFSET_BIAS, 1); 382 w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); 383 w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); 384 385 /* Write to the di->raw[] buffer directly - the CURRENT_OFFSET_BIAS 386 * value won't be read back by ds2760_battery_read_status() */ 387 di->raw[DS2760_CURRENT_OFFSET_BIAS] = bias; 388} 389 390static void ds2760_battery_set_charged(struct power_supply *psy) 391{ 392 struct ds2760_device_info *di = to_ds2760_device_info(psy); 393 394 /* postpone the actual work by 20 secs. This is for debouncing GPIO 395 * signals and to let the current value settle. See AN4188. */ 396 cancel_delayed_work(&di->set_charged_work); 397 queue_delayed_work(di->monitor_wqueue, &di->set_charged_work, HZ * 20); 398} 399 400static int ds2760_battery_get_property(struct power_supply *psy, 401 enum power_supply_property psp, 402 union power_supply_propval *val) 403{ 404 struct ds2760_device_info *di = to_ds2760_device_info(psy); 405 406 switch (psp) { 407 case POWER_SUPPLY_PROP_STATUS: 408 val->intval = di->charge_status; 409 return 0; 410 default: 411 break; 412 } 413 414 ds2760_battery_read_status(di); 415 416 switch (psp) { 417 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 418 val->intval = di->voltage_uV; 419 break; 420 case POWER_SUPPLY_PROP_CURRENT_NOW: 421 val->intval = di->current_uA; 422 break; 423 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 424 val->intval = di->rated_capacity; 425 break; 426 case POWER_SUPPLY_PROP_CHARGE_FULL: 427 val->intval = di->full_active_uAh; 428 break; 429 case POWER_SUPPLY_PROP_CHARGE_EMPTY: 430 val->intval = di->empty_uAh; 431 break; 432 case POWER_SUPPLY_PROP_CHARGE_NOW: 433 val->intval = di->accum_current_uAh; 434 break; 435 case POWER_SUPPLY_PROP_TEMP: 436 val->intval = di->temp_C; 437 break; 438 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW: 439 val->intval = di->life_sec; 440 break; 441 case POWER_SUPPLY_PROP_CAPACITY: 442 val->intval = di->rem_capacity; 443 break; 444 default: 445 return -EINVAL; 446 } 447 448 return 0; 449} 450 451static int ds2760_battery_set_property(struct power_supply *psy, 452 enum power_supply_property psp, 453 const union power_supply_propval *val) 454{ 455 struct ds2760_device_info *di = to_ds2760_device_info(psy); 456 457 switch (psp) { 458 case POWER_SUPPLY_PROP_CHARGE_FULL: 459 /* the interface counts in uAh, convert the value */ 460 ds2760_battery_write_active_full(di, val->intval / 1000L); 461 break; 462 463 case POWER_SUPPLY_PROP_CHARGE_NOW: 464 /* ds2760_battery_set_current_accum() does the conversion */ 465 ds2760_battery_set_current_accum(di, val->intval); 466 break; 467 468 default: 469 return -EPERM; 470 } 471 472 return 0; 473} 474 475static int ds2760_battery_property_is_writeable(struct power_supply *psy, 476 enum power_supply_property psp) 477{ 478 switch (psp) { 479 case POWER_SUPPLY_PROP_CHARGE_FULL: 480 case POWER_SUPPLY_PROP_CHARGE_NOW: 481 return 1; 482 483 default: 484 break; 485 } 486 487 return 0; 488} 489 490static enum power_supply_property ds2760_battery_props[] = { 491 POWER_SUPPLY_PROP_STATUS, 492 POWER_SUPPLY_PROP_VOLTAGE_NOW, 493 POWER_SUPPLY_PROP_CURRENT_NOW, 494 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 495 POWER_SUPPLY_PROP_CHARGE_FULL, 496 POWER_SUPPLY_PROP_CHARGE_EMPTY, 497 POWER_SUPPLY_PROP_CHARGE_NOW, 498 POWER_SUPPLY_PROP_TEMP, 499 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW, 500 POWER_SUPPLY_PROP_CAPACITY, 501}; 502 503static int ds2760_battery_probe(struct platform_device *pdev) 504{ 505 char status; 506 int retval = 0; 507 struct ds2760_device_info *di; 508 509 di = kzalloc(sizeof(*di), GFP_KERNEL); 510 if (!di) { 511 retval = -ENOMEM; 512 goto di_alloc_failed; 513 } 514 515 platform_set_drvdata(pdev, di); 516 517 di->dev = &pdev->dev; 518 di->w1_dev = pdev->dev.parent; 519 di->bat.name = dev_name(&pdev->dev); 520 di->bat.type = POWER_SUPPLY_TYPE_BATTERY; 521 di->bat.properties = ds2760_battery_props; 522 di->bat.num_properties = ARRAY_SIZE(ds2760_battery_props); 523 di->bat.get_property = ds2760_battery_get_property; 524 di->bat.set_property = ds2760_battery_set_property; 525 di->bat.property_is_writeable = 526 ds2760_battery_property_is_writeable; 527 di->bat.set_charged = ds2760_battery_set_charged; 528 di->bat.external_power_changed = 529 ds2760_battery_external_power_changed; 530 531 di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN; 532 533 /* enable sleep mode feature */ 534 ds2760_battery_read_status(di); 535 status = di->raw[DS2760_STATUS_REG]; 536 if (pmod_enabled) 537 status |= DS2760_STATUS_PMOD; 538 else 539 status &= ~DS2760_STATUS_PMOD; 540 541 ds2760_battery_write_status(di, status); 542 543 /* set rated capacity from module param */ 544 if (rated_capacity) 545 ds2760_battery_write_rated_capacity(di, rated_capacity); 546 547 /* set current accumulator if given as parameter. 548 * this should only be done for bootstrapping the value */ 549 if (current_accum) 550 ds2760_battery_set_current_accum(di, current_accum); 551 552 retval = power_supply_register(&pdev->dev, &di->bat); 553 if (retval) { 554 dev_err(di->dev, "failed to register battery\n"); 555 goto batt_failed; 556 } 557 558 INIT_DELAYED_WORK(&di->monitor_work, ds2760_battery_work); 559 INIT_DELAYED_WORK(&di->set_charged_work, 560 ds2760_battery_set_charged_work); 561 di->monitor_wqueue = create_singlethread_workqueue(dev_name(&pdev->dev)); 562 if (!di->monitor_wqueue) { 563 retval = -ESRCH; 564 goto workqueue_failed; 565 } 566 queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ * 1); 567 568 goto success; 569 570workqueue_failed: 571 power_supply_unregister(&di->bat); 572batt_failed: 573 kfree(di); 574di_alloc_failed: 575success: 576 return retval; 577} 578 579static int ds2760_battery_remove(struct platform_device *pdev) 580{ 581 struct ds2760_device_info *di = platform_get_drvdata(pdev); 582 583 cancel_rearming_delayed_workqueue(di->monitor_wqueue, 584 &di->monitor_work); 585 cancel_rearming_delayed_workqueue(di->monitor_wqueue, 586 &di->set_charged_work); 587 destroy_workqueue(di->monitor_wqueue); 588 power_supply_unregister(&di->bat); 589 590 return 0; 591} 592 593#ifdef CONFIG_PM 594 595static int ds2760_battery_suspend(struct platform_device *pdev, 596 pm_message_t state) 597{ 598 struct ds2760_device_info *di = platform_get_drvdata(pdev); 599 600 di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN; 601 602 return 0; 603} 604 605static int ds2760_battery_resume(struct platform_device *pdev) 606{ 607 struct ds2760_device_info *di = platform_get_drvdata(pdev); 608 609 di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN; 610 power_supply_changed(&di->bat); 611 612 cancel_delayed_work(&di->monitor_work); 613 queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ); 614 615 return 0; 616} 617 618#else 619 620#define ds2760_battery_suspend NULL 621#define ds2760_battery_resume NULL 622 623#endif /* CONFIG_PM */ 624 625MODULE_ALIAS("platform:ds2760-battery"); 626 627static struct platform_driver ds2760_battery_driver = { 628 .driver = { 629 .name = "ds2760-battery", 630 }, 631 .probe = ds2760_battery_probe, 632 .remove = ds2760_battery_remove, 633 .suspend = ds2760_battery_suspend, 634 .resume = ds2760_battery_resume, 635}; 636 637static int __init ds2760_battery_init(void) 638{ 639 return platform_driver_register(&ds2760_battery_driver); 640} 641 642static void __exit ds2760_battery_exit(void) 643{ 644 platform_driver_unregister(&ds2760_battery_driver); 645} 646 647module_init(ds2760_battery_init); 648module_exit(ds2760_battery_exit); 649 650MODULE_LICENSE("GPL"); 651MODULE_AUTHOR("Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>, " 652 "Matt Reimer <mreimer@vpop.net>, " 653 "Anton Vorontsov <cbou@mail.ru>"); 654MODULE_DESCRIPTION("ds2760 battery driver"); 655