1/* 2 * battery.c - ACPI Battery Driver (Revision: 2.0) 3 * 4 * Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de> 5 * Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com> 6 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 7 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 8 * 9 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or (at 14 * your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, but 17 * WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 19 * General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License along 22 * with this program; if not, write to the Free Software Foundation, Inc., 23 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 24 * 25 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 26 */ 27 28#include <linux/kernel.h> 29#include <linux/module.h> 30#include <linux/init.h> 31#include <linux/types.h> 32#include <linux/jiffies.h> 33#include <linux/async.h> 34#include <linux/dmi.h> 35#include <linux/delay.h> 36#include <linux/slab.h> 37#include <linux/suspend.h> 38#include <asm/unaligned.h> 39 40#ifdef CONFIG_ACPI_PROCFS_POWER 41#include <linux/proc_fs.h> 42#include <linux/seq_file.h> 43#include <asm/uaccess.h> 44#endif 45 46#include <linux/acpi.h> 47#include <linux/power_supply.h> 48 49#include "battery.h" 50 51#define PREFIX "ACPI: " 52 53#define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF 54 55#define ACPI_BATTERY_DEVICE_NAME "Battery" 56 57/* Battery power unit: 0 means mW, 1 means mA */ 58#define ACPI_BATTERY_POWER_UNIT_MA 1 59 60#define ACPI_BATTERY_STATE_DISCHARGING 0x1 61#define ACPI_BATTERY_STATE_CHARGING 0x2 62#define ACPI_BATTERY_STATE_CRITICAL 0x4 63 64#define _COMPONENT ACPI_BATTERY_COMPONENT 65 66ACPI_MODULE_NAME("battery"); 67 68MODULE_AUTHOR("Paul Diefenbaugh"); 69MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>"); 70MODULE_DESCRIPTION("ACPI Battery Driver"); 71MODULE_LICENSE("GPL"); 72 73static int battery_bix_broken_package; 74static int battery_notification_delay_ms; 75static unsigned int cache_time = 1000; 76module_param(cache_time, uint, 0644); 77MODULE_PARM_DESC(cache_time, "cache time in milliseconds"); 78 79#ifdef CONFIG_ACPI_PROCFS_POWER 80extern struct proc_dir_entry *acpi_lock_battery_dir(void); 81extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir); 82 83enum acpi_battery_files { 84 info_tag = 0, 85 state_tag, 86 alarm_tag, 87 ACPI_BATTERY_NUMFILES, 88}; 89 90#endif 91 92static const struct acpi_device_id battery_device_ids[] = { 93 {"PNP0C0A", 0}, 94 {"", 0}, 95}; 96 97MODULE_DEVICE_TABLE(acpi, battery_device_ids); 98 99enum { 100 ACPI_BATTERY_ALARM_PRESENT, 101 ACPI_BATTERY_XINFO_PRESENT, 102 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, 103 /* On Lenovo Thinkpad models from 2010 and 2011, the power unit 104 switches between mWh and mAh depending on whether the system 105 is running on battery or not. When mAh is the unit, most 106 reported values are incorrect and need to be adjusted by 107 10000/design_voltage. Verified on x201, t410, t410s, and x220. 108 Pre-2010 and 2012 models appear to always report in mWh and 109 are thus unaffected (tested with t42, t61, t500, x200, x300, 110 and x230). Also, in mid-2012 Lenovo issued a BIOS update for 111 the 2011 models that fixes the issue (tested on x220 with a 112 post-1.29 BIOS), but as of Nov. 2012, no such update is 113 available for the 2010 models. */ 114 ACPI_BATTERY_QUIRK_THINKPAD_MAH, 115}; 116 117struct acpi_battery { 118 struct mutex lock; 119 struct mutex sysfs_lock; 120 struct power_supply *bat; 121 struct power_supply_desc bat_desc; 122 struct acpi_device *device; 123 struct notifier_block pm_nb; 124 unsigned long update_time; 125 int revision; 126 int rate_now; 127 int capacity_now; 128 int voltage_now; 129 int design_capacity; 130 int full_charge_capacity; 131 int technology; 132 int design_voltage; 133 int design_capacity_warning; 134 int design_capacity_low; 135 int cycle_count; 136 int measurement_accuracy; 137 int max_sampling_time; 138 int min_sampling_time; 139 int max_averaging_interval; 140 int min_averaging_interval; 141 int capacity_granularity_1; 142 int capacity_granularity_2; 143 int alarm; 144 char model_number[32]; 145 char serial_number[32]; 146 char type[32]; 147 char oem_info[32]; 148 int state; 149 int power_unit; 150 unsigned long flags; 151}; 152 153#define to_acpi_battery(x) power_supply_get_drvdata(x) 154 155static inline int acpi_battery_present(struct acpi_battery *battery) 156{ 157 return battery->device->status.battery_present; 158} 159 160static int acpi_battery_technology(struct acpi_battery *battery) 161{ 162 if (!strcasecmp("NiCd", battery->type)) 163 return POWER_SUPPLY_TECHNOLOGY_NiCd; 164 if (!strcasecmp("NiMH", battery->type)) 165 return POWER_SUPPLY_TECHNOLOGY_NiMH; 166 if (!strcasecmp("LION", battery->type)) 167 return POWER_SUPPLY_TECHNOLOGY_LION; 168 if (!strncasecmp("LI-ION", battery->type, 6)) 169 return POWER_SUPPLY_TECHNOLOGY_LION; 170 if (!strcasecmp("LiP", battery->type)) 171 return POWER_SUPPLY_TECHNOLOGY_LIPO; 172 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN; 173} 174 175static int acpi_battery_get_state(struct acpi_battery *battery); 176 177static int acpi_battery_is_charged(struct acpi_battery *battery) 178{ 179 /* charging, discharging or critical low */ 180 if (battery->state != 0) 181 return 0; 182 183 /* battery not reporting charge */ 184 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN || 185 battery->capacity_now == 0) 186 return 0; 187 188 /* good batteries update full_charge as the batteries degrade */ 189 if (battery->full_charge_capacity == battery->capacity_now) 190 return 1; 191 192 /* fallback to using design values for broken batteries */ 193 if (battery->design_capacity == battery->capacity_now) 194 return 1; 195 196 /* we don't do any sort of metric based on percentages */ 197 return 0; 198} 199 200static int acpi_battery_get_property(struct power_supply *psy, 201 enum power_supply_property psp, 202 union power_supply_propval *val) 203{ 204 int ret = 0; 205 struct acpi_battery *battery = to_acpi_battery(psy); 206 207 if (acpi_battery_present(battery)) { 208 /* run battery update only if it is present */ 209 acpi_battery_get_state(battery); 210 } else if (psp != POWER_SUPPLY_PROP_PRESENT) 211 return -ENODEV; 212 switch (psp) { 213 case POWER_SUPPLY_PROP_STATUS: 214 if (battery->state & ACPI_BATTERY_STATE_DISCHARGING) 215 val->intval = POWER_SUPPLY_STATUS_DISCHARGING; 216 else if (battery->state & ACPI_BATTERY_STATE_CHARGING) 217 val->intval = POWER_SUPPLY_STATUS_CHARGING; 218 else if (acpi_battery_is_charged(battery)) 219 val->intval = POWER_SUPPLY_STATUS_FULL; 220 else 221 val->intval = POWER_SUPPLY_STATUS_UNKNOWN; 222 break; 223 case POWER_SUPPLY_PROP_PRESENT: 224 val->intval = acpi_battery_present(battery); 225 break; 226 case POWER_SUPPLY_PROP_TECHNOLOGY: 227 val->intval = acpi_battery_technology(battery); 228 break; 229 case POWER_SUPPLY_PROP_CYCLE_COUNT: 230 val->intval = battery->cycle_count; 231 break; 232 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: 233 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN) 234 ret = -ENODEV; 235 else 236 val->intval = battery->design_voltage * 1000; 237 break; 238 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 239 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN) 240 ret = -ENODEV; 241 else 242 val->intval = battery->voltage_now * 1000; 243 break; 244 case POWER_SUPPLY_PROP_CURRENT_NOW: 245 case POWER_SUPPLY_PROP_POWER_NOW: 246 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN) 247 ret = -ENODEV; 248 else 249 val->intval = battery->rate_now * 1000; 250 break; 251 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 252 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: 253 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 254 ret = -ENODEV; 255 else 256 val->intval = battery->design_capacity * 1000; 257 break; 258 case POWER_SUPPLY_PROP_CHARGE_FULL: 259 case POWER_SUPPLY_PROP_ENERGY_FULL: 260 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 261 ret = -ENODEV; 262 else 263 val->intval = battery->full_charge_capacity * 1000; 264 break; 265 case POWER_SUPPLY_PROP_CHARGE_NOW: 266 case POWER_SUPPLY_PROP_ENERGY_NOW: 267 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN) 268 ret = -ENODEV; 269 else 270 val->intval = battery->capacity_now * 1000; 271 break; 272 case POWER_SUPPLY_PROP_CAPACITY: 273 if (battery->capacity_now && battery->full_charge_capacity) 274 val->intval = battery->capacity_now * 100/ 275 battery->full_charge_capacity; 276 else 277 val->intval = 0; 278 break; 279 case POWER_SUPPLY_PROP_CAPACITY_LEVEL: 280 if (battery->state & ACPI_BATTERY_STATE_CRITICAL) 281 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL; 282 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) && 283 (battery->capacity_now <= battery->alarm)) 284 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW; 285 else if (acpi_battery_is_charged(battery)) 286 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL; 287 else 288 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; 289 break; 290 case POWER_SUPPLY_PROP_MODEL_NAME: 291 val->strval = battery->model_number; 292 break; 293 case POWER_SUPPLY_PROP_MANUFACTURER: 294 val->strval = battery->oem_info; 295 break; 296 case POWER_SUPPLY_PROP_SERIAL_NUMBER: 297 val->strval = battery->serial_number; 298 break; 299 default: 300 ret = -EINVAL; 301 } 302 return ret; 303} 304 305static enum power_supply_property charge_battery_props[] = { 306 POWER_SUPPLY_PROP_STATUS, 307 POWER_SUPPLY_PROP_PRESENT, 308 POWER_SUPPLY_PROP_TECHNOLOGY, 309 POWER_SUPPLY_PROP_CYCLE_COUNT, 310 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 311 POWER_SUPPLY_PROP_VOLTAGE_NOW, 312 POWER_SUPPLY_PROP_CURRENT_NOW, 313 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 314 POWER_SUPPLY_PROP_CHARGE_FULL, 315 POWER_SUPPLY_PROP_CHARGE_NOW, 316 POWER_SUPPLY_PROP_CAPACITY, 317 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 318 POWER_SUPPLY_PROP_MODEL_NAME, 319 POWER_SUPPLY_PROP_MANUFACTURER, 320 POWER_SUPPLY_PROP_SERIAL_NUMBER, 321}; 322 323static enum power_supply_property energy_battery_props[] = { 324 POWER_SUPPLY_PROP_STATUS, 325 POWER_SUPPLY_PROP_PRESENT, 326 POWER_SUPPLY_PROP_TECHNOLOGY, 327 POWER_SUPPLY_PROP_CYCLE_COUNT, 328 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 329 POWER_SUPPLY_PROP_VOLTAGE_NOW, 330 POWER_SUPPLY_PROP_POWER_NOW, 331 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 332 POWER_SUPPLY_PROP_ENERGY_FULL, 333 POWER_SUPPLY_PROP_ENERGY_NOW, 334 POWER_SUPPLY_PROP_CAPACITY, 335 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 336 POWER_SUPPLY_PROP_MODEL_NAME, 337 POWER_SUPPLY_PROP_MANUFACTURER, 338 POWER_SUPPLY_PROP_SERIAL_NUMBER, 339}; 340 341#ifdef CONFIG_ACPI_PROCFS_POWER 342inline char *acpi_battery_units(struct acpi_battery *battery) 343{ 344 return (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) ? 345 "mA" : "mW"; 346} 347#endif 348 349/* -------------------------------------------------------------------------- 350 Battery Management 351 -------------------------------------------------------------------------- */ 352struct acpi_offsets { 353 size_t offset; /* offset inside struct acpi_sbs_battery */ 354 u8 mode; /* int or string? */ 355}; 356 357static struct acpi_offsets state_offsets[] = { 358 {offsetof(struct acpi_battery, state), 0}, 359 {offsetof(struct acpi_battery, rate_now), 0}, 360 {offsetof(struct acpi_battery, capacity_now), 0}, 361 {offsetof(struct acpi_battery, voltage_now), 0}, 362}; 363 364static struct acpi_offsets info_offsets[] = { 365 {offsetof(struct acpi_battery, power_unit), 0}, 366 {offsetof(struct acpi_battery, design_capacity), 0}, 367 {offsetof(struct acpi_battery, full_charge_capacity), 0}, 368 {offsetof(struct acpi_battery, technology), 0}, 369 {offsetof(struct acpi_battery, design_voltage), 0}, 370 {offsetof(struct acpi_battery, design_capacity_warning), 0}, 371 {offsetof(struct acpi_battery, design_capacity_low), 0}, 372 {offsetof(struct acpi_battery, capacity_granularity_1), 0}, 373 {offsetof(struct acpi_battery, capacity_granularity_2), 0}, 374 {offsetof(struct acpi_battery, model_number), 1}, 375 {offsetof(struct acpi_battery, serial_number), 1}, 376 {offsetof(struct acpi_battery, type), 1}, 377 {offsetof(struct acpi_battery, oem_info), 1}, 378}; 379 380static struct acpi_offsets extended_info_offsets[] = { 381 {offsetof(struct acpi_battery, revision), 0}, 382 {offsetof(struct acpi_battery, power_unit), 0}, 383 {offsetof(struct acpi_battery, design_capacity), 0}, 384 {offsetof(struct acpi_battery, full_charge_capacity), 0}, 385 {offsetof(struct acpi_battery, technology), 0}, 386 {offsetof(struct acpi_battery, design_voltage), 0}, 387 {offsetof(struct acpi_battery, design_capacity_warning), 0}, 388 {offsetof(struct acpi_battery, design_capacity_low), 0}, 389 {offsetof(struct acpi_battery, cycle_count), 0}, 390 {offsetof(struct acpi_battery, measurement_accuracy), 0}, 391 {offsetof(struct acpi_battery, max_sampling_time), 0}, 392 {offsetof(struct acpi_battery, min_sampling_time), 0}, 393 {offsetof(struct acpi_battery, max_averaging_interval), 0}, 394 {offsetof(struct acpi_battery, min_averaging_interval), 0}, 395 {offsetof(struct acpi_battery, capacity_granularity_1), 0}, 396 {offsetof(struct acpi_battery, capacity_granularity_2), 0}, 397 {offsetof(struct acpi_battery, model_number), 1}, 398 {offsetof(struct acpi_battery, serial_number), 1}, 399 {offsetof(struct acpi_battery, type), 1}, 400 {offsetof(struct acpi_battery, oem_info), 1}, 401}; 402 403static int extract_package(struct acpi_battery *battery, 404 union acpi_object *package, 405 struct acpi_offsets *offsets, int num) 406{ 407 int i; 408 union acpi_object *element; 409 if (package->type != ACPI_TYPE_PACKAGE) 410 return -EFAULT; 411 for (i = 0; i < num; ++i) { 412 if (package->package.count <= i) 413 return -EFAULT; 414 element = &package->package.elements[i]; 415 if (offsets[i].mode) { 416 u8 *ptr = (u8 *)battery + offsets[i].offset; 417 if (element->type == ACPI_TYPE_STRING || 418 element->type == ACPI_TYPE_BUFFER) 419 strncpy(ptr, element->string.pointer, 32); 420 else if (element->type == ACPI_TYPE_INTEGER) { 421 strncpy(ptr, (u8 *)&element->integer.value, 422 sizeof(u64)); 423 ptr[sizeof(u64)] = 0; 424 } else 425 *ptr = 0; /* don't have value */ 426 } else { 427 int *x = (int *)((u8 *)battery + offsets[i].offset); 428 *x = (element->type == ACPI_TYPE_INTEGER) ? 429 element->integer.value : -1; 430 } 431 } 432 return 0; 433} 434 435static int acpi_battery_get_status(struct acpi_battery *battery) 436{ 437 if (acpi_bus_get_status(battery->device)) { 438 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA")); 439 return -ENODEV; 440 } 441 return 0; 442} 443 444static int acpi_battery_get_info(struct acpi_battery *battery) 445{ 446 int result = -EFAULT; 447 acpi_status status = 0; 448 char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags) ? 449 "_BIX" : "_BIF"; 450 451 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 452 453 if (!acpi_battery_present(battery)) 454 return 0; 455 mutex_lock(&battery->lock); 456 status = acpi_evaluate_object(battery->device->handle, name, 457 NULL, &buffer); 458 mutex_unlock(&battery->lock); 459 460 if (ACPI_FAILURE(status)) { 461 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name)); 462 return -ENODEV; 463 } 464 465 if (battery_bix_broken_package) 466 result = extract_package(battery, buffer.pointer, 467 extended_info_offsets + 1, 468 ARRAY_SIZE(extended_info_offsets) - 1); 469 else if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags)) 470 result = extract_package(battery, buffer.pointer, 471 extended_info_offsets, 472 ARRAY_SIZE(extended_info_offsets)); 473 else 474 result = extract_package(battery, buffer.pointer, 475 info_offsets, ARRAY_SIZE(info_offsets)); 476 kfree(buffer.pointer); 477 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) 478 battery->full_charge_capacity = battery->design_capacity; 479 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) && 480 battery->power_unit && battery->design_voltage) { 481 battery->design_capacity = battery->design_capacity * 482 10000 / battery->design_voltage; 483 battery->full_charge_capacity = battery->full_charge_capacity * 484 10000 / battery->design_voltage; 485 battery->design_capacity_warning = 486 battery->design_capacity_warning * 487 10000 / battery->design_voltage; 488 /* Curiously, design_capacity_low, unlike the rest of them, 489 is correct. */ 490 /* capacity_granularity_* equal 1 on the systems tested, so 491 it's impossible to tell if they would need an adjustment 492 or not if their values were higher. */ 493 } 494 return result; 495} 496 497static int acpi_battery_get_state(struct acpi_battery *battery) 498{ 499 int result = 0; 500 acpi_status status = 0; 501 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 502 503 if (!acpi_battery_present(battery)) 504 return 0; 505 506 if (battery->update_time && 507 time_before(jiffies, battery->update_time + 508 msecs_to_jiffies(cache_time))) 509 return 0; 510 511 mutex_lock(&battery->lock); 512 status = acpi_evaluate_object(battery->device->handle, "_BST", 513 NULL, &buffer); 514 mutex_unlock(&battery->lock); 515 516 if (ACPI_FAILURE(status)) { 517 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST")); 518 return -ENODEV; 519 } 520 521 result = extract_package(battery, buffer.pointer, 522 state_offsets, ARRAY_SIZE(state_offsets)); 523 battery->update_time = jiffies; 524 kfree(buffer.pointer); 525 526 /* For buggy DSDTs that report negative 16-bit values for either 527 * charging or discharging current and/or report 0 as 65536 528 * due to bad math. 529 */ 530 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA && 531 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN && 532 (s16)(battery->rate_now) < 0) { 533 battery->rate_now = abs((s16)battery->rate_now); 534 printk_once(KERN_WARNING FW_BUG 535 "battery: (dis)charge rate invalid.\n"); 536 } 537 538 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags) 539 && battery->capacity_now >= 0 && battery->capacity_now <= 100) 540 battery->capacity_now = (battery->capacity_now * 541 battery->full_charge_capacity) / 100; 542 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) && 543 battery->power_unit && battery->design_voltage) { 544 battery->capacity_now = battery->capacity_now * 545 10000 / battery->design_voltage; 546 } 547 return result; 548} 549 550static int acpi_battery_set_alarm(struct acpi_battery *battery) 551{ 552 acpi_status status = 0; 553 554 if (!acpi_battery_present(battery) || 555 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags)) 556 return -ENODEV; 557 558 mutex_lock(&battery->lock); 559 status = acpi_execute_simple_method(battery->device->handle, "_BTP", 560 battery->alarm); 561 mutex_unlock(&battery->lock); 562 563 if (ACPI_FAILURE(status)) 564 return -ENODEV; 565 566 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm)); 567 return 0; 568} 569 570static int acpi_battery_init_alarm(struct acpi_battery *battery) 571{ 572 /* See if alarms are supported, and if so, set default */ 573 if (!acpi_has_method(battery->device->handle, "_BTP")) { 574 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags); 575 return 0; 576 } 577 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags); 578 if (!battery->alarm) 579 battery->alarm = battery->design_capacity_warning; 580 return acpi_battery_set_alarm(battery); 581} 582 583static ssize_t acpi_battery_alarm_show(struct device *dev, 584 struct device_attribute *attr, 585 char *buf) 586{ 587 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 588 return sprintf(buf, "%d\n", battery->alarm * 1000); 589} 590 591static ssize_t acpi_battery_alarm_store(struct device *dev, 592 struct device_attribute *attr, 593 const char *buf, size_t count) 594{ 595 unsigned long x; 596 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 597 if (sscanf(buf, "%lu\n", &x) == 1) 598 battery->alarm = x/1000; 599 if (acpi_battery_present(battery)) 600 acpi_battery_set_alarm(battery); 601 return count; 602} 603 604static struct device_attribute alarm_attr = { 605 .attr = {.name = "alarm", .mode = 0644}, 606 .show = acpi_battery_alarm_show, 607 .store = acpi_battery_alarm_store, 608}; 609 610static int sysfs_add_battery(struct acpi_battery *battery) 611{ 612 struct power_supply_config psy_cfg = { .drv_data = battery, }; 613 614 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) { 615 battery->bat_desc.properties = charge_battery_props; 616 battery->bat_desc.num_properties = 617 ARRAY_SIZE(charge_battery_props); 618 } else { 619 battery->bat_desc.properties = energy_battery_props; 620 battery->bat_desc.num_properties = 621 ARRAY_SIZE(energy_battery_props); 622 } 623 624 battery->bat_desc.name = acpi_device_bid(battery->device); 625 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY; 626 battery->bat_desc.get_property = acpi_battery_get_property; 627 628 battery->bat = power_supply_register_no_ws(&battery->device->dev, 629 &battery->bat_desc, &psy_cfg); 630 631 if (IS_ERR(battery->bat)) { 632 int result = PTR_ERR(battery->bat); 633 634 battery->bat = NULL; 635 return result; 636 } 637 return device_create_file(&battery->bat->dev, &alarm_attr); 638} 639 640static void sysfs_remove_battery(struct acpi_battery *battery) 641{ 642 mutex_lock(&battery->sysfs_lock); 643 if (!battery->bat) { 644 mutex_unlock(&battery->sysfs_lock); 645 return; 646 } 647 648 device_remove_file(&battery->bat->dev, &alarm_attr); 649 power_supply_unregister(battery->bat); 650 battery->bat = NULL; 651 mutex_unlock(&battery->sysfs_lock); 652} 653 654static void find_battery(const struct dmi_header *dm, void *private) 655{ 656 struct acpi_battery *battery = (struct acpi_battery *)private; 657 /* Note: the hardcoded offsets below have been extracted from 658 the source code of dmidecode. */ 659 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) { 660 const u8 *dmi_data = (const u8 *)(dm + 1); 661 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6)); 662 if (dm->length >= 18) 663 dmi_capacity *= dmi_data[17]; 664 if (battery->design_capacity * battery->design_voltage / 1000 665 != dmi_capacity && 666 battery->design_capacity * 10 == dmi_capacity) 667 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, 668 &battery->flags); 669 } 670} 671 672/* 673 * According to the ACPI spec, some kinds of primary batteries can 674 * report percentage battery remaining capacity directly to OS. 675 * In this case, it reports the Last Full Charged Capacity == 100 676 * and BatteryPresentRate == 0xFFFFFFFF. 677 * 678 * Now we found some battery reports percentage remaining capacity 679 * even if it's rechargeable. 680 * https://bugzilla.kernel.org/show_bug.cgi?id=15979 681 * 682 * Handle this correctly so that they won't break userspace. 683 */ 684static void acpi_battery_quirks(struct acpi_battery *battery) 685{ 686 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) 687 return; 688 689 if (battery->full_charge_capacity == 100 && 690 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN && 691 battery->capacity_now >= 0 && battery->capacity_now <= 100) { 692 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags); 693 battery->full_charge_capacity = battery->design_capacity; 694 battery->capacity_now = (battery->capacity_now * 695 battery->full_charge_capacity) / 100; 696 } 697 698 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags)) 699 return; 700 701 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) { 702 const char *s; 703 s = dmi_get_system_info(DMI_PRODUCT_VERSION); 704 if (s && !strncasecmp(s, "ThinkPad", 8)) { 705 dmi_walk(find_battery, battery); 706 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, 707 &battery->flags) && 708 battery->design_voltage) { 709 battery->design_capacity = 710 battery->design_capacity * 711 10000 / battery->design_voltage; 712 battery->full_charge_capacity = 713 battery->full_charge_capacity * 714 10000 / battery->design_voltage; 715 battery->design_capacity_warning = 716 battery->design_capacity_warning * 717 10000 / battery->design_voltage; 718 battery->capacity_now = battery->capacity_now * 719 10000 / battery->design_voltage; 720 } 721 } 722 } 723} 724 725static int acpi_battery_update(struct acpi_battery *battery, bool resume) 726{ 727 int result, old_present = acpi_battery_present(battery); 728 result = acpi_battery_get_status(battery); 729 if (result) 730 return result; 731 if (!acpi_battery_present(battery)) { 732 sysfs_remove_battery(battery); 733 battery->update_time = 0; 734 return 0; 735 } 736 737 if (resume) 738 return 0; 739 740 if (!battery->update_time || 741 old_present != acpi_battery_present(battery)) { 742 result = acpi_battery_get_info(battery); 743 if (result) 744 return result; 745 acpi_battery_init_alarm(battery); 746 } 747 if (!battery->bat) { 748 result = sysfs_add_battery(battery); 749 if (result) 750 return result; 751 } 752 result = acpi_battery_get_state(battery); 753 if (result) 754 return result; 755 acpi_battery_quirks(battery); 756 757 /* 758 * Wakeup the system if battery is critical low 759 * or lower than the alarm level 760 */ 761 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) || 762 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) && 763 (battery->capacity_now <= battery->alarm))) 764 pm_wakeup_event(&battery->device->dev, 0); 765 766 return result; 767} 768 769static void acpi_battery_refresh(struct acpi_battery *battery) 770{ 771 int power_unit; 772 773 if (!battery->bat) 774 return; 775 776 power_unit = battery->power_unit; 777 778 acpi_battery_get_info(battery); 779 780 if (power_unit == battery->power_unit) 781 return; 782 783 /* The battery has changed its reporting units. */ 784 sysfs_remove_battery(battery); 785 sysfs_add_battery(battery); 786} 787 788/* -------------------------------------------------------------------------- 789 FS Interface (/proc) 790 -------------------------------------------------------------------------- */ 791 792#ifdef CONFIG_ACPI_PROCFS_POWER 793static struct proc_dir_entry *acpi_battery_dir; 794 795static int acpi_battery_print_info(struct seq_file *seq, int result) 796{ 797 struct acpi_battery *battery = seq->private; 798 799 if (result) 800 goto end; 801 802 seq_printf(seq, "present: %s\n", 803 acpi_battery_present(battery) ? "yes" : "no"); 804 if (!acpi_battery_present(battery)) 805 goto end; 806 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 807 seq_printf(seq, "design capacity: unknown\n"); 808 else 809 seq_printf(seq, "design capacity: %d %sh\n", 810 battery->design_capacity, 811 acpi_battery_units(battery)); 812 813 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 814 seq_printf(seq, "last full capacity: unknown\n"); 815 else 816 seq_printf(seq, "last full capacity: %d %sh\n", 817 battery->full_charge_capacity, 818 acpi_battery_units(battery)); 819 820 seq_printf(seq, "battery technology: %srechargeable\n", 821 (!battery->technology)?"non-":""); 822 823 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN) 824 seq_printf(seq, "design voltage: unknown\n"); 825 else 826 seq_printf(seq, "design voltage: %d mV\n", 827 battery->design_voltage); 828 seq_printf(seq, "design capacity warning: %d %sh\n", 829 battery->design_capacity_warning, 830 acpi_battery_units(battery)); 831 seq_printf(seq, "design capacity low: %d %sh\n", 832 battery->design_capacity_low, 833 acpi_battery_units(battery)); 834 seq_printf(seq, "cycle count: %i\n", battery->cycle_count); 835 seq_printf(seq, "capacity granularity 1: %d %sh\n", 836 battery->capacity_granularity_1, 837 acpi_battery_units(battery)); 838 seq_printf(seq, "capacity granularity 2: %d %sh\n", 839 battery->capacity_granularity_2, 840 acpi_battery_units(battery)); 841 seq_printf(seq, "model number: %s\n", battery->model_number); 842 seq_printf(seq, "serial number: %s\n", battery->serial_number); 843 seq_printf(seq, "battery type: %s\n", battery->type); 844 seq_printf(seq, "OEM info: %s\n", battery->oem_info); 845 end: 846 if (result) 847 seq_printf(seq, "ERROR: Unable to read battery info\n"); 848 return result; 849} 850 851static int acpi_battery_print_state(struct seq_file *seq, int result) 852{ 853 struct acpi_battery *battery = seq->private; 854 855 if (result) 856 goto end; 857 858 seq_printf(seq, "present: %s\n", 859 acpi_battery_present(battery) ? "yes" : "no"); 860 if (!acpi_battery_present(battery)) 861 goto end; 862 863 seq_printf(seq, "capacity state: %s\n", 864 (battery->state & 0x04) ? "critical" : "ok"); 865 if ((battery->state & 0x01) && (battery->state & 0x02)) 866 seq_printf(seq, 867 "charging state: charging/discharging\n"); 868 else if (battery->state & 0x01) 869 seq_printf(seq, "charging state: discharging\n"); 870 else if (battery->state & 0x02) 871 seq_printf(seq, "charging state: charging\n"); 872 else 873 seq_printf(seq, "charging state: charged\n"); 874 875 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN) 876 seq_printf(seq, "present rate: unknown\n"); 877 else 878 seq_printf(seq, "present rate: %d %s\n", 879 battery->rate_now, acpi_battery_units(battery)); 880 881 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN) 882 seq_printf(seq, "remaining capacity: unknown\n"); 883 else 884 seq_printf(seq, "remaining capacity: %d %sh\n", 885 battery->capacity_now, acpi_battery_units(battery)); 886 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN) 887 seq_printf(seq, "present voltage: unknown\n"); 888 else 889 seq_printf(seq, "present voltage: %d mV\n", 890 battery->voltage_now); 891 end: 892 if (result) 893 seq_printf(seq, "ERROR: Unable to read battery state\n"); 894 895 return result; 896} 897 898static int acpi_battery_print_alarm(struct seq_file *seq, int result) 899{ 900 struct acpi_battery *battery = seq->private; 901 902 if (result) 903 goto end; 904 905 if (!acpi_battery_present(battery)) { 906 seq_printf(seq, "present: no\n"); 907 goto end; 908 } 909 seq_printf(seq, "alarm: "); 910 if (!battery->alarm) 911 seq_printf(seq, "unsupported\n"); 912 else 913 seq_printf(seq, "%u %sh\n", battery->alarm, 914 acpi_battery_units(battery)); 915 end: 916 if (result) 917 seq_printf(seq, "ERROR: Unable to read battery alarm\n"); 918 return result; 919} 920 921static ssize_t acpi_battery_write_alarm(struct file *file, 922 const char __user * buffer, 923 size_t count, loff_t * ppos) 924{ 925 int result = 0; 926 char alarm_string[12] = { '\0' }; 927 struct seq_file *m = file->private_data; 928 struct acpi_battery *battery = m->private; 929 930 if (!battery || (count > sizeof(alarm_string) - 1)) 931 return -EINVAL; 932 if (!acpi_battery_present(battery)) { 933 result = -ENODEV; 934 goto end; 935 } 936 if (copy_from_user(alarm_string, buffer, count)) { 937 result = -EFAULT; 938 goto end; 939 } 940 alarm_string[count] = '\0'; 941 if (kstrtoint(alarm_string, 0, &battery->alarm)) { 942 result = -EINVAL; 943 goto end; 944 } 945 result = acpi_battery_set_alarm(battery); 946 end: 947 if (!result) 948 return count; 949 return result; 950} 951 952typedef int(*print_func)(struct seq_file *seq, int result); 953 954static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = { 955 acpi_battery_print_info, 956 acpi_battery_print_state, 957 acpi_battery_print_alarm, 958}; 959 960static int acpi_battery_read(int fid, struct seq_file *seq) 961{ 962 struct acpi_battery *battery = seq->private; 963 int result = acpi_battery_update(battery, false); 964 return acpi_print_funcs[fid](seq, result); 965} 966 967#define DECLARE_FILE_FUNCTIONS(_name) \ 968static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \ 969{ \ 970 return acpi_battery_read(_name##_tag, seq); \ 971} \ 972static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \ 973{ \ 974 return single_open(file, acpi_battery_read_##_name, PDE_DATA(inode)); \ 975} 976 977DECLARE_FILE_FUNCTIONS(info); 978DECLARE_FILE_FUNCTIONS(state); 979DECLARE_FILE_FUNCTIONS(alarm); 980 981#undef DECLARE_FILE_FUNCTIONS 982 983#define FILE_DESCRIPTION_RO(_name) \ 984 { \ 985 .name = __stringify(_name), \ 986 .mode = S_IRUGO, \ 987 .ops = { \ 988 .open = acpi_battery_##_name##_open_fs, \ 989 .read = seq_read, \ 990 .llseek = seq_lseek, \ 991 .release = single_release, \ 992 .owner = THIS_MODULE, \ 993 }, \ 994 } 995 996#define FILE_DESCRIPTION_RW(_name) \ 997 { \ 998 .name = __stringify(_name), \ 999 .mode = S_IFREG | S_IRUGO | S_IWUSR, \ 1000 .ops = { \ 1001 .open = acpi_battery_##_name##_open_fs, \ 1002 .read = seq_read, \ 1003 .llseek = seq_lseek, \ 1004 .write = acpi_battery_write_##_name, \ 1005 .release = single_release, \ 1006 .owner = THIS_MODULE, \ 1007 }, \ 1008 } 1009 1010static const struct battery_file { 1011 struct file_operations ops; 1012 umode_t mode; 1013 const char *name; 1014} acpi_battery_file[] = { 1015 FILE_DESCRIPTION_RO(info), 1016 FILE_DESCRIPTION_RO(state), 1017 FILE_DESCRIPTION_RW(alarm), 1018}; 1019 1020#undef FILE_DESCRIPTION_RO 1021#undef FILE_DESCRIPTION_RW 1022 1023static int acpi_battery_add_fs(struct acpi_device *device) 1024{ 1025 struct proc_dir_entry *entry = NULL; 1026 int i; 1027 1028 printk(KERN_WARNING PREFIX "Deprecated procfs I/F for battery is loaded," 1029 " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n"); 1030 if (!acpi_device_dir(device)) { 1031 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 1032 acpi_battery_dir); 1033 if (!acpi_device_dir(device)) 1034 return -ENODEV; 1035 } 1036 1037 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) { 1038 entry = proc_create_data(acpi_battery_file[i].name, 1039 acpi_battery_file[i].mode, 1040 acpi_device_dir(device), 1041 &acpi_battery_file[i].ops, 1042 acpi_driver_data(device)); 1043 if (!entry) 1044 return -ENODEV; 1045 } 1046 return 0; 1047} 1048 1049static void acpi_battery_remove_fs(struct acpi_device *device) 1050{ 1051 int i; 1052 if (!acpi_device_dir(device)) 1053 return; 1054 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) 1055 remove_proc_entry(acpi_battery_file[i].name, 1056 acpi_device_dir(device)); 1057 1058 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir); 1059 acpi_device_dir(device) = NULL; 1060} 1061 1062#endif 1063 1064/* -------------------------------------------------------------------------- 1065 Driver Interface 1066 -------------------------------------------------------------------------- */ 1067 1068static void acpi_battery_notify(struct acpi_device *device, u32 event) 1069{ 1070 struct acpi_battery *battery = acpi_driver_data(device); 1071 struct power_supply *old; 1072 1073 if (!battery) 1074 return; 1075 old = battery->bat; 1076 /* 1077 * On Acer Aspire V5-573G notifications are sometimes triggered too 1078 * early. For example, when AC is unplugged and notification is 1079 * triggered, battery state is still reported as "Full", and changes to 1080 * "Discharging" only after short delay, without any notification. 1081 */ 1082 if (battery_notification_delay_ms > 0) 1083 msleep(battery_notification_delay_ms); 1084 if (event == ACPI_BATTERY_NOTIFY_INFO) 1085 acpi_battery_refresh(battery); 1086 acpi_battery_update(battery, false); 1087 acpi_bus_generate_netlink_event(device->pnp.device_class, 1088 dev_name(&device->dev), event, 1089 acpi_battery_present(battery)); 1090 acpi_notifier_call_chain(device, event, acpi_battery_present(battery)); 1091 /* acpi_battery_update could remove power_supply object */ 1092 if (old && battery->bat) 1093 power_supply_changed(battery->bat); 1094} 1095 1096static int battery_notify(struct notifier_block *nb, 1097 unsigned long mode, void *_unused) 1098{ 1099 struct acpi_battery *battery = container_of(nb, struct acpi_battery, 1100 pm_nb); 1101 int result; 1102 1103 switch (mode) { 1104 case PM_POST_HIBERNATION: 1105 case PM_POST_SUSPEND: 1106 if (!acpi_battery_present(battery)) 1107 return 0; 1108 1109 if (!battery->bat) { 1110 result = acpi_battery_get_info(battery); 1111 if (result) 1112 return result; 1113 1114 result = sysfs_add_battery(battery); 1115 if (result) 1116 return result; 1117 } else 1118 acpi_battery_refresh(battery); 1119 1120 acpi_battery_init_alarm(battery); 1121 acpi_battery_get_state(battery); 1122 break; 1123 } 1124 1125 return 0; 1126} 1127 1128static int battery_bix_broken_package_quirk(const struct dmi_system_id *d) 1129{ 1130 battery_bix_broken_package = 1; 1131 return 0; 1132} 1133 1134static int battery_notification_delay_quirk(const struct dmi_system_id *d) 1135{ 1136 battery_notification_delay_ms = 1000; 1137 return 0; 1138} 1139 1140static struct dmi_system_id bat_dmi_table[] = { 1141 { 1142 .callback = battery_bix_broken_package_quirk, 1143 .ident = "NEC LZ750/LS", 1144 .matches = { 1145 DMI_MATCH(DMI_SYS_VENDOR, "NEC"), 1146 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"), 1147 }, 1148 }, 1149 { 1150 .callback = battery_notification_delay_quirk, 1151 .ident = "Acer Aspire V5-573G", 1152 .matches = { 1153 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 1154 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"), 1155 }, 1156 }, 1157 {}, 1158}; 1159 1160/* 1161 * Some machines'(E,G Lenovo Z480) ECs are not stable 1162 * during boot up and this causes battery driver fails to be 1163 * probed due to failure of getting battery information 1164 * from EC sometimes. After several retries, the operation 1165 * may work. So add retry code here and 20ms sleep between 1166 * every retries. 1167 */ 1168static int acpi_battery_update_retry(struct acpi_battery *battery) 1169{ 1170 int retry, ret; 1171 1172 for (retry = 5; retry; retry--) { 1173 ret = acpi_battery_update(battery, false); 1174 if (!ret) 1175 break; 1176 1177 msleep(20); 1178 } 1179 return ret; 1180} 1181 1182static int acpi_battery_add(struct acpi_device *device) 1183{ 1184 int result = 0; 1185 struct acpi_battery *battery = NULL; 1186 1187 if (!device) 1188 return -EINVAL; 1189 1190 if (device->dep_unmet) 1191 return -EPROBE_DEFER; 1192 1193 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL); 1194 if (!battery) 1195 return -ENOMEM; 1196 battery->device = device; 1197 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME); 1198 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS); 1199 device->driver_data = battery; 1200 mutex_init(&battery->lock); 1201 mutex_init(&battery->sysfs_lock); 1202 if (acpi_has_method(battery->device->handle, "_BIX")) 1203 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags); 1204 1205 result = acpi_battery_update_retry(battery); 1206 if (result) 1207 goto fail; 1208 1209#ifdef CONFIG_ACPI_PROCFS_POWER 1210 result = acpi_battery_add_fs(device); 1211#endif 1212 if (result) { 1213#ifdef CONFIG_ACPI_PROCFS_POWER 1214 acpi_battery_remove_fs(device); 1215#endif 1216 goto fail; 1217 } 1218 1219 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n", 1220 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device), 1221 device->status.battery_present ? "present" : "absent"); 1222 1223 battery->pm_nb.notifier_call = battery_notify; 1224 register_pm_notifier(&battery->pm_nb); 1225 1226 device_init_wakeup(&device->dev, 1); 1227 1228 return result; 1229 1230fail: 1231 sysfs_remove_battery(battery); 1232 mutex_destroy(&battery->lock); 1233 mutex_destroy(&battery->sysfs_lock); 1234 kfree(battery); 1235 return result; 1236} 1237 1238static int acpi_battery_remove(struct acpi_device *device) 1239{ 1240 struct acpi_battery *battery = NULL; 1241 1242 if (!device || !acpi_driver_data(device)) 1243 return -EINVAL; 1244 device_init_wakeup(&device->dev, 0); 1245 battery = acpi_driver_data(device); 1246 unregister_pm_notifier(&battery->pm_nb); 1247#ifdef CONFIG_ACPI_PROCFS_POWER 1248 acpi_battery_remove_fs(device); 1249#endif 1250 sysfs_remove_battery(battery); 1251 mutex_destroy(&battery->lock); 1252 mutex_destroy(&battery->sysfs_lock); 1253 kfree(battery); 1254 return 0; 1255} 1256 1257#ifdef CONFIG_PM_SLEEP 1258/* this is needed to learn about changes made in suspended state */ 1259static int acpi_battery_resume(struct device *dev) 1260{ 1261 struct acpi_battery *battery; 1262 1263 if (!dev) 1264 return -EINVAL; 1265 1266 battery = acpi_driver_data(to_acpi_device(dev)); 1267 if (!battery) 1268 return -EINVAL; 1269 1270 battery->update_time = 0; 1271 acpi_battery_update(battery, true); 1272 return 0; 1273} 1274#else 1275#define acpi_battery_resume NULL 1276#endif 1277 1278static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume); 1279 1280static struct acpi_driver acpi_battery_driver = { 1281 .name = "battery", 1282 .class = ACPI_BATTERY_CLASS, 1283 .ids = battery_device_ids, 1284 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS, 1285 .ops = { 1286 .add = acpi_battery_add, 1287 .remove = acpi_battery_remove, 1288 .notify = acpi_battery_notify, 1289 }, 1290 .drv.pm = &acpi_battery_pm, 1291}; 1292 1293static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie) 1294{ 1295 if (acpi_disabled) 1296 return; 1297 1298 dmi_check_system(bat_dmi_table); 1299 1300#ifdef CONFIG_ACPI_PROCFS_POWER 1301 acpi_battery_dir = acpi_lock_battery_dir(); 1302 if (!acpi_battery_dir) 1303 return; 1304#endif 1305 if (acpi_bus_register_driver(&acpi_battery_driver) < 0) { 1306#ifdef CONFIG_ACPI_PROCFS_POWER 1307 acpi_unlock_battery_dir(acpi_battery_dir); 1308#endif 1309 return; 1310 } 1311 return; 1312} 1313 1314static int __init acpi_battery_init(void) 1315{ 1316 async_schedule(acpi_battery_init_async, NULL); 1317 return 0; 1318} 1319 1320static void __exit acpi_battery_exit(void) 1321{ 1322 acpi_bus_unregister_driver(&acpi_battery_driver); 1323#ifdef CONFIG_ACPI_PROCFS_POWER 1324 acpi_unlock_battery_dir(acpi_battery_dir); 1325#endif 1326} 1327 1328module_init(acpi_battery_init); 1329module_exit(acpi_battery_exit); 1330