1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * battery.c - ACPI Battery Driver (Revision: 2.0) 4 * 5 * Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de> 6 * Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com> 7 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 8 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 9 */ 10 11#define pr_fmt(fmt) "ACPI: battery: " fmt 12 13#include <linux/async.h> 14#include <linux/delay.h> 15#include <linux/dmi.h> 16#include <linux/jiffies.h> 17#include <linux/kernel.h> 18#include <linux/list.h> 19#include <linux/module.h> 20#include <linux/mutex.h> 21#include <linux/slab.h> 22#include <linux/suspend.h> 23#include <linux/types.h> 24 25#include <asm/unaligned.h> 26 27#include <linux/acpi.h> 28#include <linux/power_supply.h> 29 30#include <acpi/battery.h> 31 32#define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF 33#define ACPI_BATTERY_CAPACITY_VALID(capacity) \ 34 ((capacity) != 0 && (capacity) != ACPI_BATTERY_VALUE_UNKNOWN) 35 36#define ACPI_BATTERY_DEVICE_NAME "Battery" 37 38/* Battery power unit: 0 means mW, 1 means mA */ 39#define ACPI_BATTERY_POWER_UNIT_MA 1 40 41#define ACPI_BATTERY_STATE_DISCHARGING 0x1 42#define ACPI_BATTERY_STATE_CHARGING 0x2 43#define ACPI_BATTERY_STATE_CRITICAL 0x4 44 45#define MAX_STRING_LENGTH 64 46 47MODULE_AUTHOR("Paul Diefenbaugh"); 48MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>"); 49MODULE_DESCRIPTION("ACPI Battery Driver"); 50MODULE_LICENSE("GPL"); 51 52static async_cookie_t async_cookie; 53static bool battery_driver_registered; 54static int battery_bix_broken_package; 55static int battery_notification_delay_ms; 56static int battery_ac_is_broken; 57static unsigned int cache_time = 1000; 58module_param(cache_time, uint, 0644); 59MODULE_PARM_DESC(cache_time, "cache time in milliseconds"); 60 61static const struct acpi_device_id battery_device_ids[] = { 62 {"PNP0C0A", 0}, 63 64 /* Microsoft Surface Go 3 */ 65 {"MSHW0146", 0}, 66 67 {"", 0}, 68}; 69 70MODULE_DEVICE_TABLE(acpi, battery_device_ids); 71 72enum { 73 ACPI_BATTERY_ALARM_PRESENT, 74 ACPI_BATTERY_XINFO_PRESENT, 75 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, 76 /* On Lenovo Thinkpad models from 2010 and 2011, the power unit 77 * switches between mWh and mAh depending on whether the system 78 * is running on battery or not. When mAh is the unit, most 79 * reported values are incorrect and need to be adjusted by 80 * 10000/design_voltage. Verified on x201, t410, t410s, and x220. 81 * Pre-2010 and 2012 models appear to always report in mWh and 82 * are thus unaffected (tested with t42, t61, t500, x200, x300, 83 * and x230). Also, in mid-2012 Lenovo issued a BIOS update for 84 * the 2011 models that fixes the issue (tested on x220 with a 85 * post-1.29 BIOS), but as of Nov. 2012, no such update is 86 * available for the 2010 models. 87 */ 88 ACPI_BATTERY_QUIRK_THINKPAD_MAH, 89 /* for batteries reporting current capacity with design capacity 90 * on a full charge, but showing degradation in full charge cap. 91 */ 92 ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, 93}; 94 95struct acpi_battery { 96 struct mutex lock; 97 struct mutex sysfs_lock; 98 struct power_supply *bat; 99 struct power_supply_desc bat_desc; 100 struct acpi_device *device; 101 struct notifier_block pm_nb; 102 struct list_head list; 103 unsigned long update_time; 104 int revision; 105 int rate_now; 106 int capacity_now; 107 int voltage_now; 108 int design_capacity; 109 int full_charge_capacity; 110 int technology; 111 int design_voltage; 112 int design_capacity_warning; 113 int design_capacity_low; 114 int cycle_count; 115 int measurement_accuracy; 116 int max_sampling_time; 117 int min_sampling_time; 118 int max_averaging_interval; 119 int min_averaging_interval; 120 int capacity_granularity_1; 121 int capacity_granularity_2; 122 int alarm; 123 char model_number[MAX_STRING_LENGTH]; 124 char serial_number[MAX_STRING_LENGTH]; 125 char type[MAX_STRING_LENGTH]; 126 char oem_info[MAX_STRING_LENGTH]; 127 int state; 128 int power_unit; 129 unsigned long flags; 130}; 131 132#define to_acpi_battery(x) power_supply_get_drvdata(x) 133 134static inline int acpi_battery_present(struct acpi_battery *battery) 135{ 136 return battery->device->status.battery_present; 137} 138 139static int acpi_battery_technology(struct acpi_battery *battery) 140{ 141 if (!strcasecmp("NiCd", battery->type)) 142 return POWER_SUPPLY_TECHNOLOGY_NiCd; 143 if (!strcasecmp("NiMH", battery->type)) 144 return POWER_SUPPLY_TECHNOLOGY_NiMH; 145 if (!strcasecmp("LION", battery->type)) 146 return POWER_SUPPLY_TECHNOLOGY_LION; 147 if (!strncasecmp("LI-ION", battery->type, 6)) 148 return POWER_SUPPLY_TECHNOLOGY_LION; 149 if (!strcasecmp("LiP", battery->type)) 150 return POWER_SUPPLY_TECHNOLOGY_LIPO; 151 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN; 152} 153 154static int acpi_battery_get_state(struct acpi_battery *battery); 155 156static int acpi_battery_is_charged(struct acpi_battery *battery) 157{ 158 /* charging, discharging or critical low */ 159 if (battery->state != 0) 160 return 0; 161 162 /* battery not reporting charge */ 163 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN || 164 battery->capacity_now == 0) 165 return 0; 166 167 /* good batteries update full_charge as the batteries degrade */ 168 if (battery->full_charge_capacity == battery->capacity_now) 169 return 1; 170 171 /* fallback to using design values for broken batteries */ 172 if (battery->design_capacity <= battery->capacity_now) 173 return 1; 174 175 /* we don't do any sort of metric based on percentages */ 176 return 0; 177} 178 179static bool acpi_battery_is_degraded(struct acpi_battery *battery) 180{ 181 return ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) && 182 ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity) && 183 battery->full_charge_capacity < battery->design_capacity; 184} 185 186static int acpi_battery_handle_discharging(struct acpi_battery *battery) 187{ 188 /* 189 * Some devices wrongly report discharging if the battery's charge level 190 * was above the device's start charging threshold atm the AC adapter 191 * was plugged in and the device thus did not start a new charge cycle. 192 */ 193 if ((battery_ac_is_broken || power_supply_is_system_supplied()) && 194 battery->rate_now == 0) 195 return POWER_SUPPLY_STATUS_NOT_CHARGING; 196 197 return POWER_SUPPLY_STATUS_DISCHARGING; 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 full_capacity = ACPI_BATTERY_VALUE_UNKNOWN, 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 = acpi_battery_handle_discharging(battery); 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_NOT_CHARGING; 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 (!ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) 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 (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity)) 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 (ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity)) 274 full_capacity = battery->full_charge_capacity; 275 else if (ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) 276 full_capacity = battery->design_capacity; 277 278 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN || 279 full_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 280 ret = -ENODEV; 281 else 282 val->intval = battery->capacity_now * 100/ 283 full_capacity; 284 break; 285 case POWER_SUPPLY_PROP_CAPACITY_LEVEL: 286 if (battery->state & ACPI_BATTERY_STATE_CRITICAL) 287 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL; 288 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) && 289 (battery->capacity_now <= battery->alarm)) 290 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW; 291 else if (acpi_battery_is_charged(battery)) 292 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL; 293 else 294 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; 295 break; 296 case POWER_SUPPLY_PROP_MODEL_NAME: 297 val->strval = battery->model_number; 298 break; 299 case POWER_SUPPLY_PROP_MANUFACTURER: 300 val->strval = battery->oem_info; 301 break; 302 case POWER_SUPPLY_PROP_SERIAL_NUMBER: 303 val->strval = battery->serial_number; 304 break; 305 default: 306 ret = -EINVAL; 307 } 308 return ret; 309} 310 311static enum power_supply_property charge_battery_props[] = { 312 POWER_SUPPLY_PROP_STATUS, 313 POWER_SUPPLY_PROP_PRESENT, 314 POWER_SUPPLY_PROP_TECHNOLOGY, 315 POWER_SUPPLY_PROP_CYCLE_COUNT, 316 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 317 POWER_SUPPLY_PROP_VOLTAGE_NOW, 318 POWER_SUPPLY_PROP_CURRENT_NOW, 319 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 320 POWER_SUPPLY_PROP_CHARGE_FULL, 321 POWER_SUPPLY_PROP_CHARGE_NOW, 322 POWER_SUPPLY_PROP_CAPACITY, 323 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 324 POWER_SUPPLY_PROP_MODEL_NAME, 325 POWER_SUPPLY_PROP_MANUFACTURER, 326 POWER_SUPPLY_PROP_SERIAL_NUMBER, 327}; 328 329static enum power_supply_property charge_battery_full_cap_broken_props[] = { 330 POWER_SUPPLY_PROP_STATUS, 331 POWER_SUPPLY_PROP_PRESENT, 332 POWER_SUPPLY_PROP_TECHNOLOGY, 333 POWER_SUPPLY_PROP_CYCLE_COUNT, 334 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 335 POWER_SUPPLY_PROP_VOLTAGE_NOW, 336 POWER_SUPPLY_PROP_CURRENT_NOW, 337 POWER_SUPPLY_PROP_CHARGE_NOW, 338 POWER_SUPPLY_PROP_MODEL_NAME, 339 POWER_SUPPLY_PROP_MANUFACTURER, 340 POWER_SUPPLY_PROP_SERIAL_NUMBER, 341}; 342 343static enum power_supply_property energy_battery_props[] = { 344 POWER_SUPPLY_PROP_STATUS, 345 POWER_SUPPLY_PROP_PRESENT, 346 POWER_SUPPLY_PROP_TECHNOLOGY, 347 POWER_SUPPLY_PROP_CYCLE_COUNT, 348 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 349 POWER_SUPPLY_PROP_VOLTAGE_NOW, 350 POWER_SUPPLY_PROP_POWER_NOW, 351 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 352 POWER_SUPPLY_PROP_ENERGY_FULL, 353 POWER_SUPPLY_PROP_ENERGY_NOW, 354 POWER_SUPPLY_PROP_CAPACITY, 355 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 356 POWER_SUPPLY_PROP_MODEL_NAME, 357 POWER_SUPPLY_PROP_MANUFACTURER, 358 POWER_SUPPLY_PROP_SERIAL_NUMBER, 359}; 360 361static enum power_supply_property energy_battery_full_cap_broken_props[] = { 362 POWER_SUPPLY_PROP_STATUS, 363 POWER_SUPPLY_PROP_PRESENT, 364 POWER_SUPPLY_PROP_TECHNOLOGY, 365 POWER_SUPPLY_PROP_CYCLE_COUNT, 366 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 367 POWER_SUPPLY_PROP_VOLTAGE_NOW, 368 POWER_SUPPLY_PROP_POWER_NOW, 369 POWER_SUPPLY_PROP_ENERGY_NOW, 370 POWER_SUPPLY_PROP_MODEL_NAME, 371 POWER_SUPPLY_PROP_MANUFACTURER, 372 POWER_SUPPLY_PROP_SERIAL_NUMBER, 373}; 374 375/* Battery Management */ 376struct acpi_offsets { 377 size_t offset; /* offset inside struct acpi_sbs_battery */ 378 u8 mode; /* int or string? */ 379}; 380 381static const struct acpi_offsets state_offsets[] = { 382 {offsetof(struct acpi_battery, state), 0}, 383 {offsetof(struct acpi_battery, rate_now), 0}, 384 {offsetof(struct acpi_battery, capacity_now), 0}, 385 {offsetof(struct acpi_battery, voltage_now), 0}, 386}; 387 388static const struct acpi_offsets info_offsets[] = { 389 {offsetof(struct acpi_battery, power_unit), 0}, 390 {offsetof(struct acpi_battery, design_capacity), 0}, 391 {offsetof(struct acpi_battery, full_charge_capacity), 0}, 392 {offsetof(struct acpi_battery, technology), 0}, 393 {offsetof(struct acpi_battery, design_voltage), 0}, 394 {offsetof(struct acpi_battery, design_capacity_warning), 0}, 395 {offsetof(struct acpi_battery, design_capacity_low), 0}, 396 {offsetof(struct acpi_battery, capacity_granularity_1), 0}, 397 {offsetof(struct acpi_battery, capacity_granularity_2), 0}, 398 {offsetof(struct acpi_battery, model_number), 1}, 399 {offsetof(struct acpi_battery, serial_number), 1}, 400 {offsetof(struct acpi_battery, type), 1}, 401 {offsetof(struct acpi_battery, oem_info), 1}, 402}; 403 404static const struct acpi_offsets extended_info_offsets[] = { 405 {offsetof(struct acpi_battery, revision), 0}, 406 {offsetof(struct acpi_battery, power_unit), 0}, 407 {offsetof(struct acpi_battery, design_capacity), 0}, 408 {offsetof(struct acpi_battery, full_charge_capacity), 0}, 409 {offsetof(struct acpi_battery, technology), 0}, 410 {offsetof(struct acpi_battery, design_voltage), 0}, 411 {offsetof(struct acpi_battery, design_capacity_warning), 0}, 412 {offsetof(struct acpi_battery, design_capacity_low), 0}, 413 {offsetof(struct acpi_battery, cycle_count), 0}, 414 {offsetof(struct acpi_battery, measurement_accuracy), 0}, 415 {offsetof(struct acpi_battery, max_sampling_time), 0}, 416 {offsetof(struct acpi_battery, min_sampling_time), 0}, 417 {offsetof(struct acpi_battery, max_averaging_interval), 0}, 418 {offsetof(struct acpi_battery, min_averaging_interval), 0}, 419 {offsetof(struct acpi_battery, capacity_granularity_1), 0}, 420 {offsetof(struct acpi_battery, capacity_granularity_2), 0}, 421 {offsetof(struct acpi_battery, model_number), 1}, 422 {offsetof(struct acpi_battery, serial_number), 1}, 423 {offsetof(struct acpi_battery, type), 1}, 424 {offsetof(struct acpi_battery, oem_info), 1}, 425}; 426 427static int extract_package(struct acpi_battery *battery, 428 union acpi_object *package, 429 const struct acpi_offsets *offsets, int num) 430{ 431 int i; 432 union acpi_object *element; 433 434 if (package->type != ACPI_TYPE_PACKAGE) 435 return -EFAULT; 436 for (i = 0; i < num; ++i) { 437 if (package->package.count <= i) 438 return -EFAULT; 439 element = &package->package.elements[i]; 440 if (offsets[i].mode) { 441 u8 *ptr = (u8 *)battery + offsets[i].offset; 442 u32 len = MAX_STRING_LENGTH; 443 444 switch (element->type) { 445 case ACPI_TYPE_BUFFER: 446 if (len > element->buffer.length + 1) 447 len = element->buffer.length + 1; 448 449 fallthrough; 450 case ACPI_TYPE_STRING: 451 strscpy(ptr, element->string.pointer, len); 452 453 break; 454 case ACPI_TYPE_INTEGER: 455 strscpy(ptr, (u8 *)&element->integer.value, sizeof(u64) + 1); 456 457 break; 458 default: 459 *ptr = 0; /* don't have value */ 460 } 461 } else { 462 int *x = (int *)((u8 *)battery + offsets[i].offset); 463 *x = (element->type == ACPI_TYPE_INTEGER) ? 464 element->integer.value : -1; 465 } 466 } 467 return 0; 468} 469 470static int acpi_battery_get_status(struct acpi_battery *battery) 471{ 472 if (acpi_bus_get_status(battery->device)) { 473 acpi_handle_info(battery->device->handle, 474 "_STA evaluation failed\n"); 475 return -ENODEV; 476 } 477 return 0; 478} 479 480 481static int extract_battery_info(const int use_bix, 482 struct acpi_battery *battery, 483 const struct acpi_buffer *buffer) 484{ 485 int result = -EFAULT; 486 487 if (use_bix && battery_bix_broken_package) 488 result = extract_package(battery, buffer->pointer, 489 extended_info_offsets + 1, 490 ARRAY_SIZE(extended_info_offsets) - 1); 491 else if (use_bix) 492 result = extract_package(battery, buffer->pointer, 493 extended_info_offsets, 494 ARRAY_SIZE(extended_info_offsets)); 495 else 496 result = extract_package(battery, buffer->pointer, 497 info_offsets, ARRAY_SIZE(info_offsets)); 498 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) 499 battery->full_charge_capacity = battery->design_capacity; 500 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) && 501 battery->power_unit && battery->design_voltage) { 502 battery->design_capacity = battery->design_capacity * 503 10000 / battery->design_voltage; 504 battery->full_charge_capacity = battery->full_charge_capacity * 505 10000 / battery->design_voltage; 506 battery->design_capacity_warning = 507 battery->design_capacity_warning * 508 10000 / battery->design_voltage; 509 /* Curiously, design_capacity_low, unlike the rest of them, 510 * is correct. 511 */ 512 /* capacity_granularity_* equal 1 on the systems tested, so 513 * it's impossible to tell if they would need an adjustment 514 * or not if their values were higher. 515 */ 516 } 517 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) && 518 battery->capacity_now > battery->full_charge_capacity) 519 battery->capacity_now = battery->full_charge_capacity; 520 521 return result; 522} 523 524static int acpi_battery_get_info(struct acpi_battery *battery) 525{ 526 const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags); 527 int use_bix; 528 int result = -ENODEV; 529 530 if (!acpi_battery_present(battery)) 531 return 0; 532 533 534 for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) { 535 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 536 acpi_status status = AE_ERROR; 537 538 mutex_lock(&battery->lock); 539 status = acpi_evaluate_object(battery->device->handle, 540 use_bix ? "_BIX":"_BIF", 541 NULL, &buffer); 542 mutex_unlock(&battery->lock); 543 544 if (ACPI_FAILURE(status)) { 545 acpi_handle_info(battery->device->handle, 546 "%s evaluation failed: %s\n", 547 use_bix ? "_BIX":"_BIF", 548 acpi_format_exception(status)); 549 } else { 550 result = extract_battery_info(use_bix, 551 battery, 552 &buffer); 553 554 kfree(buffer.pointer); 555 break; 556 } 557 } 558 559 if (!result && !use_bix && xinfo) 560 pr_warn(FW_BUG "The _BIX method is broken, using _BIF.\n"); 561 562 return result; 563} 564 565static int acpi_battery_get_state(struct acpi_battery *battery) 566{ 567 int result = 0; 568 acpi_status status = 0; 569 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 570 571 if (!acpi_battery_present(battery)) 572 return 0; 573 574 if (battery->update_time && 575 time_before(jiffies, battery->update_time + 576 msecs_to_jiffies(cache_time))) 577 return 0; 578 579 mutex_lock(&battery->lock); 580 status = acpi_evaluate_object(battery->device->handle, "_BST", 581 NULL, &buffer); 582 mutex_unlock(&battery->lock); 583 584 if (ACPI_FAILURE(status)) { 585 acpi_handle_info(battery->device->handle, 586 "_BST evaluation failed: %s", 587 acpi_format_exception(status)); 588 return -ENODEV; 589 } 590 591 result = extract_package(battery, buffer.pointer, 592 state_offsets, ARRAY_SIZE(state_offsets)); 593 battery->update_time = jiffies; 594 kfree(buffer.pointer); 595 596 /* For buggy DSDTs that report negative 16-bit values for either 597 * charging or discharging current and/or report 0 as 65536 598 * due to bad math. 599 */ 600 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA && 601 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN && 602 (s16)(battery->rate_now) < 0) { 603 battery->rate_now = abs((s16)battery->rate_now); 604 pr_warn_once(FW_BUG "(dis)charge rate invalid.\n"); 605 } 606 607 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags) 608 && battery->capacity_now >= 0 && battery->capacity_now <= 100) 609 battery->capacity_now = (battery->capacity_now * 610 battery->full_charge_capacity) / 100; 611 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) && 612 battery->power_unit && battery->design_voltage) { 613 battery->capacity_now = battery->capacity_now * 614 10000 / battery->design_voltage; 615 } 616 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) && 617 battery->capacity_now > battery->full_charge_capacity) 618 battery->capacity_now = battery->full_charge_capacity; 619 620 return result; 621} 622 623static int acpi_battery_set_alarm(struct acpi_battery *battery) 624{ 625 acpi_status status = 0; 626 627 if (!acpi_battery_present(battery) || 628 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags)) 629 return -ENODEV; 630 631 mutex_lock(&battery->lock); 632 status = acpi_execute_simple_method(battery->device->handle, "_BTP", 633 battery->alarm); 634 mutex_unlock(&battery->lock); 635 636 if (ACPI_FAILURE(status)) 637 return -ENODEV; 638 639 acpi_handle_debug(battery->device->handle, "Alarm set to %d\n", 640 battery->alarm); 641 642 return 0; 643} 644 645static int acpi_battery_init_alarm(struct acpi_battery *battery) 646{ 647 /* See if alarms are supported, and if so, set default */ 648 if (!acpi_has_method(battery->device->handle, "_BTP")) { 649 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags); 650 return 0; 651 } 652 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags); 653 if (!battery->alarm) 654 battery->alarm = battery->design_capacity_warning; 655 return acpi_battery_set_alarm(battery); 656} 657 658static ssize_t acpi_battery_alarm_show(struct device *dev, 659 struct device_attribute *attr, 660 char *buf) 661{ 662 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 663 664 return sprintf(buf, "%d\n", battery->alarm * 1000); 665} 666 667static ssize_t acpi_battery_alarm_store(struct device *dev, 668 struct device_attribute *attr, 669 const char *buf, size_t count) 670{ 671 unsigned long x; 672 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 673 674 if (sscanf(buf, "%lu\n", &x) == 1) 675 battery->alarm = x/1000; 676 if (acpi_battery_present(battery)) 677 acpi_battery_set_alarm(battery); 678 return count; 679} 680 681static const struct device_attribute alarm_attr = { 682 .attr = {.name = "alarm", .mode = 0644}, 683 .show = acpi_battery_alarm_show, 684 .store = acpi_battery_alarm_store, 685}; 686 687/* 688 * The Battery Hooking API 689 * 690 * This API is used inside other drivers that need to expose 691 * platform-specific behaviour within the generic driver in a 692 * generic way. 693 * 694 */ 695 696static LIST_HEAD(acpi_battery_list); 697static LIST_HEAD(battery_hook_list); 698static DEFINE_MUTEX(hook_mutex); 699 700static void __battery_hook_unregister(struct acpi_battery_hook *hook, int lock) 701{ 702 struct acpi_battery *battery; 703 /* 704 * In order to remove a hook, we first need to 705 * de-register all the batteries that are registered. 706 */ 707 if (lock) 708 mutex_lock(&hook_mutex); 709 list_for_each_entry(battery, &acpi_battery_list, list) { 710 if (!hook->remove_battery(battery->bat, hook)) 711 power_supply_changed(battery->bat); 712 } 713 list_del(&hook->list); 714 if (lock) 715 mutex_unlock(&hook_mutex); 716 pr_info("extension unregistered: %s\n", hook->name); 717} 718 719void battery_hook_unregister(struct acpi_battery_hook *hook) 720{ 721 __battery_hook_unregister(hook, 1); 722} 723EXPORT_SYMBOL_GPL(battery_hook_unregister); 724 725void battery_hook_register(struct acpi_battery_hook *hook) 726{ 727 struct acpi_battery *battery; 728 729 mutex_lock(&hook_mutex); 730 INIT_LIST_HEAD(&hook->list); 731 list_add(&hook->list, &battery_hook_list); 732 /* 733 * Now that the driver is registered, we need 734 * to notify the hook that a battery is available 735 * for each battery, so that the driver may add 736 * its attributes. 737 */ 738 list_for_each_entry(battery, &acpi_battery_list, list) { 739 if (hook->add_battery(battery->bat, hook)) { 740 /* 741 * If a add-battery returns non-zero, 742 * the registration of the extension has failed, 743 * and we will not add it to the list of loaded 744 * hooks. 745 */ 746 pr_err("extension failed to load: %s", hook->name); 747 __battery_hook_unregister(hook, 0); 748 goto end; 749 } 750 751 power_supply_changed(battery->bat); 752 } 753 pr_info("new extension: %s\n", hook->name); 754end: 755 mutex_unlock(&hook_mutex); 756} 757EXPORT_SYMBOL_GPL(battery_hook_register); 758 759/* 760 * This function gets called right after the battery sysfs 761 * attributes have been added, so that the drivers that 762 * define custom sysfs attributes can add their own. 763 */ 764static void battery_hook_add_battery(struct acpi_battery *battery) 765{ 766 struct acpi_battery_hook *hook_node, *tmp; 767 768 mutex_lock(&hook_mutex); 769 INIT_LIST_HEAD(&battery->list); 770 list_add(&battery->list, &acpi_battery_list); 771 /* 772 * Since we added a new battery to the list, we need to 773 * iterate over the hooks and call add_battery for each 774 * hook that was registered. This usually happens 775 * when a battery gets hotplugged or initialized 776 * during the battery module initialization. 777 */ 778 list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) { 779 if (hook_node->add_battery(battery->bat, hook_node)) { 780 /* 781 * The notification of the extensions has failed, to 782 * prevent further errors we will unload the extension. 783 */ 784 pr_err("error in extension, unloading: %s", 785 hook_node->name); 786 __battery_hook_unregister(hook_node, 0); 787 } 788 } 789 mutex_unlock(&hook_mutex); 790} 791 792static void battery_hook_remove_battery(struct acpi_battery *battery) 793{ 794 struct acpi_battery_hook *hook; 795 796 mutex_lock(&hook_mutex); 797 /* 798 * Before removing the hook, we need to remove all 799 * custom attributes from the battery. 800 */ 801 list_for_each_entry(hook, &battery_hook_list, list) { 802 hook->remove_battery(battery->bat, hook); 803 } 804 /* Then, just remove the battery from the list */ 805 list_del(&battery->list); 806 mutex_unlock(&hook_mutex); 807} 808 809static void __exit battery_hook_exit(void) 810{ 811 struct acpi_battery_hook *hook; 812 struct acpi_battery_hook *ptr; 813 /* 814 * At this point, the acpi_bus_unregister_driver() 815 * has called remove for all batteries. We just 816 * need to remove the hooks. 817 */ 818 list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) { 819 __battery_hook_unregister(hook, 1); 820 } 821 mutex_destroy(&hook_mutex); 822} 823 824static int sysfs_add_battery(struct acpi_battery *battery) 825{ 826 struct power_supply_config psy_cfg = { .drv_data = battery, }; 827 bool full_cap_broken = false; 828 829 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) && 830 !ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) 831 full_cap_broken = true; 832 833 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) { 834 if (full_cap_broken) { 835 battery->bat_desc.properties = 836 charge_battery_full_cap_broken_props; 837 battery->bat_desc.num_properties = 838 ARRAY_SIZE(charge_battery_full_cap_broken_props); 839 } else { 840 battery->bat_desc.properties = charge_battery_props; 841 battery->bat_desc.num_properties = 842 ARRAY_SIZE(charge_battery_props); 843 } 844 } else { 845 if (full_cap_broken) { 846 battery->bat_desc.properties = 847 energy_battery_full_cap_broken_props; 848 battery->bat_desc.num_properties = 849 ARRAY_SIZE(energy_battery_full_cap_broken_props); 850 } else { 851 battery->bat_desc.properties = energy_battery_props; 852 battery->bat_desc.num_properties = 853 ARRAY_SIZE(energy_battery_props); 854 } 855 } 856 857 battery->bat_desc.name = acpi_device_bid(battery->device); 858 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY; 859 battery->bat_desc.get_property = acpi_battery_get_property; 860 861 battery->bat = power_supply_register_no_ws(&battery->device->dev, 862 &battery->bat_desc, &psy_cfg); 863 864 if (IS_ERR(battery->bat)) { 865 int result = PTR_ERR(battery->bat); 866 867 battery->bat = NULL; 868 return result; 869 } 870 battery_hook_add_battery(battery); 871 return device_create_file(&battery->bat->dev, &alarm_attr); 872} 873 874static void sysfs_remove_battery(struct acpi_battery *battery) 875{ 876 mutex_lock(&battery->sysfs_lock); 877 if (!battery->bat) { 878 mutex_unlock(&battery->sysfs_lock); 879 return; 880 } 881 battery_hook_remove_battery(battery); 882 device_remove_file(&battery->bat->dev, &alarm_attr); 883 power_supply_unregister(battery->bat); 884 battery->bat = NULL; 885 mutex_unlock(&battery->sysfs_lock); 886} 887 888static void find_battery(const struct dmi_header *dm, void *private) 889{ 890 struct acpi_battery *battery = (struct acpi_battery *)private; 891 /* Note: the hardcoded offsets below have been extracted from 892 * the source code of dmidecode. 893 */ 894 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) { 895 const u8 *dmi_data = (const u8 *)(dm + 1); 896 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6)); 897 898 if (dm->length >= 18) 899 dmi_capacity *= dmi_data[17]; 900 if (battery->design_capacity * battery->design_voltage / 1000 901 != dmi_capacity && 902 battery->design_capacity * 10 == dmi_capacity) 903 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, 904 &battery->flags); 905 } 906} 907 908/* 909 * According to the ACPI spec, some kinds of primary batteries can 910 * report percentage battery remaining capacity directly to OS. 911 * In this case, it reports the Last Full Charged Capacity == 100 912 * and BatteryPresentRate == 0xFFFFFFFF. 913 * 914 * Now we found some battery reports percentage remaining capacity 915 * even if it's rechargeable. 916 * https://bugzilla.kernel.org/show_bug.cgi?id=15979 917 * 918 * Handle this correctly so that they won't break userspace. 919 */ 920static void acpi_battery_quirks(struct acpi_battery *battery) 921{ 922 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) 923 return; 924 925 if (battery->full_charge_capacity == 100 && 926 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN && 927 battery->capacity_now >= 0 && battery->capacity_now <= 100) { 928 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags); 929 battery->full_charge_capacity = battery->design_capacity; 930 battery->capacity_now = (battery->capacity_now * 931 battery->full_charge_capacity) / 100; 932 } 933 934 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags)) 935 return; 936 937 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) { 938 const char *s; 939 940 s = dmi_get_system_info(DMI_PRODUCT_VERSION); 941 if (s && !strncasecmp(s, "ThinkPad", 8)) { 942 dmi_walk(find_battery, battery); 943 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, 944 &battery->flags) && 945 battery->design_voltage) { 946 battery->design_capacity = 947 battery->design_capacity * 948 10000 / battery->design_voltage; 949 battery->full_charge_capacity = 950 battery->full_charge_capacity * 951 10000 / battery->design_voltage; 952 battery->design_capacity_warning = 953 battery->design_capacity_warning * 954 10000 / battery->design_voltage; 955 battery->capacity_now = battery->capacity_now * 956 10000 / battery->design_voltage; 957 } 958 } 959 } 960 961 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags)) 962 return; 963 964 if (acpi_battery_is_degraded(battery) && 965 battery->capacity_now > battery->full_charge_capacity) { 966 set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags); 967 battery->capacity_now = battery->full_charge_capacity; 968 } 969} 970 971static int acpi_battery_update(struct acpi_battery *battery, bool resume) 972{ 973 int result = acpi_battery_get_status(battery); 974 975 if (result) 976 return result; 977 978 if (!acpi_battery_present(battery)) { 979 sysfs_remove_battery(battery); 980 battery->update_time = 0; 981 return 0; 982 } 983 984 if (resume) 985 return 0; 986 987 if (!battery->update_time) { 988 result = acpi_battery_get_info(battery); 989 if (result) 990 return result; 991 acpi_battery_init_alarm(battery); 992 } 993 994 result = acpi_battery_get_state(battery); 995 if (result) 996 return result; 997 acpi_battery_quirks(battery); 998 999 if (!battery->bat) { 1000 result = sysfs_add_battery(battery); 1001 if (result) 1002 return result; 1003 } 1004 1005 /* 1006 * Wakeup the system if battery is critical low 1007 * or lower than the alarm level 1008 */ 1009 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) || 1010 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) && 1011 (battery->capacity_now <= battery->alarm))) 1012 acpi_pm_wakeup_event(&battery->device->dev); 1013 1014 return result; 1015} 1016 1017static void acpi_battery_refresh(struct acpi_battery *battery) 1018{ 1019 int power_unit; 1020 1021 if (!battery->bat) 1022 return; 1023 1024 power_unit = battery->power_unit; 1025 1026 acpi_battery_get_info(battery); 1027 1028 if (power_unit == battery->power_unit) 1029 return; 1030 1031 /* The battery has changed its reporting units. */ 1032 sysfs_remove_battery(battery); 1033 sysfs_add_battery(battery); 1034} 1035 1036/* Driver Interface */ 1037static void acpi_battery_notify(acpi_handle handle, u32 event, void *data) 1038{ 1039 struct acpi_device *device = data; 1040 struct acpi_battery *battery = acpi_driver_data(device); 1041 struct power_supply *old; 1042 1043 if (!battery) 1044 return; 1045 old = battery->bat; 1046 /* 1047 * On Acer Aspire V5-573G notifications are sometimes triggered too 1048 * early. For example, when AC is unplugged and notification is 1049 * triggered, battery state is still reported as "Full", and changes to 1050 * "Discharging" only after short delay, without any notification. 1051 */ 1052 if (battery_notification_delay_ms > 0) 1053 msleep(battery_notification_delay_ms); 1054 if (event == ACPI_BATTERY_NOTIFY_INFO) 1055 acpi_battery_refresh(battery); 1056 acpi_battery_update(battery, false); 1057 acpi_bus_generate_netlink_event(device->pnp.device_class, 1058 dev_name(&device->dev), event, 1059 acpi_battery_present(battery)); 1060 acpi_notifier_call_chain(device, event, acpi_battery_present(battery)); 1061 /* acpi_battery_update could remove power_supply object */ 1062 if (old && battery->bat) 1063 power_supply_changed(battery->bat); 1064} 1065 1066static int battery_notify(struct notifier_block *nb, 1067 unsigned long mode, void *_unused) 1068{ 1069 struct acpi_battery *battery = container_of(nb, struct acpi_battery, 1070 pm_nb); 1071 int result; 1072 1073 switch (mode) { 1074 case PM_POST_HIBERNATION: 1075 case PM_POST_SUSPEND: 1076 if (!acpi_battery_present(battery)) 1077 return 0; 1078 1079 if (battery->bat) { 1080 acpi_battery_refresh(battery); 1081 } else { 1082 result = acpi_battery_get_info(battery); 1083 if (result) 1084 return result; 1085 1086 result = sysfs_add_battery(battery); 1087 if (result) 1088 return result; 1089 } 1090 1091 acpi_battery_init_alarm(battery); 1092 acpi_battery_get_state(battery); 1093 break; 1094 } 1095 1096 return 0; 1097} 1098 1099static int __init 1100battery_bix_broken_package_quirk(const struct dmi_system_id *d) 1101{ 1102 battery_bix_broken_package = 1; 1103 return 0; 1104} 1105 1106static int __init 1107battery_notification_delay_quirk(const struct dmi_system_id *d) 1108{ 1109 battery_notification_delay_ms = 1000; 1110 return 0; 1111} 1112 1113static int __init 1114battery_ac_is_broken_quirk(const struct dmi_system_id *d) 1115{ 1116 battery_ac_is_broken = 1; 1117 return 0; 1118} 1119 1120static const struct dmi_system_id bat_dmi_table[] __initconst = { 1121 { 1122 /* NEC LZ750/LS */ 1123 .callback = battery_bix_broken_package_quirk, 1124 .matches = { 1125 DMI_MATCH(DMI_SYS_VENDOR, "NEC"), 1126 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"), 1127 }, 1128 }, 1129 { 1130 /* Acer Aspire V5-573G */ 1131 .callback = battery_notification_delay_quirk, 1132 .matches = { 1133 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 1134 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"), 1135 }, 1136 }, 1137 { 1138 /* Point of View mobii wintab p800w */ 1139 .callback = battery_ac_is_broken_quirk, 1140 .matches = { 1141 DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"), 1142 DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"), 1143 DMI_MATCH(DMI_BIOS_VERSION, "3BAIR1013"), 1144 /* Above matches are too generic, add bios-date match */ 1145 DMI_MATCH(DMI_BIOS_DATE, "08/22/2014"), 1146 }, 1147 }, 1148 { 1149 /* Microsoft Surface Go 3 */ 1150 .callback = battery_notification_delay_quirk, 1151 .matches = { 1152 DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), 1153 DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go 3"), 1154 }, 1155 }, 1156 {}, 1157}; 1158 1159/* 1160 * Some machines'(E,G Lenovo Z480) ECs are not stable 1161 * during boot up and this causes battery driver fails to be 1162 * probed due to failure of getting battery information 1163 * from EC sometimes. After several retries, the operation 1164 * may work. So add retry code here and 20ms sleep between 1165 * every retries. 1166 */ 1167static int acpi_battery_update_retry(struct acpi_battery *battery) 1168{ 1169 int retry, ret; 1170 1171 for (retry = 5; retry; retry--) { 1172 ret = acpi_battery_update(battery, false); 1173 if (!ret) 1174 break; 1175 1176 msleep(20); 1177 } 1178 return ret; 1179} 1180 1181static int acpi_battery_add(struct acpi_device *device) 1182{ 1183 int result = 0; 1184 struct acpi_battery *battery = NULL; 1185 1186 if (!device) 1187 return -EINVAL; 1188 1189 if (device->dep_unmet) 1190 return -EPROBE_DEFER; 1191 1192 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL); 1193 if (!battery) 1194 return -ENOMEM; 1195 battery->device = device; 1196 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME); 1197 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS); 1198 device->driver_data = battery; 1199 mutex_init(&battery->lock); 1200 mutex_init(&battery->sysfs_lock); 1201 if (acpi_has_method(battery->device->handle, "_BIX")) 1202 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags); 1203 1204 result = acpi_battery_update_retry(battery); 1205 if (result) 1206 goto fail; 1207 1208 pr_info("Slot [%s] (battery %s)\n", acpi_device_bid(device), 1209 device->status.battery_present ? "present" : "absent"); 1210 1211 battery->pm_nb.notifier_call = battery_notify; 1212 register_pm_notifier(&battery->pm_nb); 1213 1214 device_init_wakeup(&device->dev, 1); 1215 1216 result = acpi_dev_install_notify_handler(device, ACPI_ALL_NOTIFY, 1217 acpi_battery_notify, device); 1218 if (result) 1219 goto fail_pm; 1220 1221 return 0; 1222 1223fail_pm: 1224 device_init_wakeup(&device->dev, 0); 1225 unregister_pm_notifier(&battery->pm_nb); 1226fail: 1227 sysfs_remove_battery(battery); 1228 mutex_destroy(&battery->lock); 1229 mutex_destroy(&battery->sysfs_lock); 1230 kfree(battery); 1231 1232 return result; 1233} 1234 1235static void acpi_battery_remove(struct acpi_device *device) 1236{ 1237 struct acpi_battery *battery = NULL; 1238 1239 if (!device || !acpi_driver_data(device)) 1240 return; 1241 1242 battery = acpi_driver_data(device); 1243 1244 acpi_dev_remove_notify_handler(device, ACPI_ALL_NOTIFY, 1245 acpi_battery_notify); 1246 1247 device_init_wakeup(&device->dev, 0); 1248 unregister_pm_notifier(&battery->pm_nb); 1249 sysfs_remove_battery(battery); 1250 1251 mutex_destroy(&battery->lock); 1252 mutex_destroy(&battery->sysfs_lock); 1253 kfree(battery); 1254} 1255 1256#ifdef CONFIG_PM_SLEEP 1257/* this is needed to learn about changes made in suspended state */ 1258static int acpi_battery_resume(struct device *dev) 1259{ 1260 struct acpi_battery *battery; 1261 1262 if (!dev) 1263 return -EINVAL; 1264 1265 battery = acpi_driver_data(to_acpi_device(dev)); 1266 if (!battery) 1267 return -EINVAL; 1268 1269 battery->update_time = 0; 1270 acpi_battery_update(battery, true); 1271 return 0; 1272} 1273#else 1274#define acpi_battery_resume NULL 1275#endif 1276 1277static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume); 1278 1279static struct acpi_driver acpi_battery_driver = { 1280 .name = "battery", 1281 .class = ACPI_BATTERY_CLASS, 1282 .ids = battery_device_ids, 1283 .ops = { 1284 .add = acpi_battery_add, 1285 .remove = acpi_battery_remove, 1286 }, 1287 .drv.pm = &acpi_battery_pm, 1288}; 1289 1290static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie) 1291{ 1292 int result; 1293 1294 if (acpi_quirk_skip_acpi_ac_and_battery()) 1295 return; 1296 1297 dmi_check_system(bat_dmi_table); 1298 1299 result = acpi_bus_register_driver(&acpi_battery_driver); 1300 battery_driver_registered = (result == 0); 1301} 1302 1303static int __init acpi_battery_init(void) 1304{ 1305 if (acpi_disabled) 1306 return -ENODEV; 1307 1308 async_cookie = async_schedule(acpi_battery_init_async, NULL); 1309 return 0; 1310} 1311 1312static void __exit acpi_battery_exit(void) 1313{ 1314 async_synchronize_cookie(async_cookie + 1); 1315 if (battery_driver_registered) { 1316 acpi_bus_unregister_driver(&acpi_battery_driver); 1317 battery_hook_exit(); 1318 } 1319} 1320 1321module_init(acpi_battery_init); 1322module_exit(acpi_battery_exit); 1323