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 MODULE_AUTHOR("Paul Diefenbaugh"); 46 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>"); 47 MODULE_DESCRIPTION("ACPI Battery Driver"); 48 MODULE_LICENSE("GPL"); 49 50 static async_cookie_t async_cookie; 51 static bool battery_driver_registered; 52 static int battery_bix_broken_package; 53 static int battery_notification_delay_ms; 54 static int battery_ac_is_broken; 55 static unsigned int cache_time = 1000; 56 module_param(cache_time, uint, 0644); 57 MODULE_PARM_DESC(cache_time, "cache time in milliseconds"); 58 59 static const struct acpi_device_id battery_device_ids[] = { 60 {"PNP0C0A", 0}, 61 62 /* Microsoft Surface Go 3 */ 63 {"MSHW0146", 0}, 64 65 {"", 0}, 66 }; 67 68 MODULE_DEVICE_TABLE(acpi, battery_device_ids); 69 70 enum { 71 ACPI_BATTERY_ALARM_PRESENT, 72 ACPI_BATTERY_XINFO_PRESENT, 73 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, 74 /* On Lenovo Thinkpad models from 2010 and 2011, the power unit 75 * switches between mWh and mAh depending on whether the system 76 * is running on battery or not. When mAh is the unit, most 77 * reported values are incorrect and need to be adjusted by 78 * 10000/design_voltage. Verified on x201, t410, t410s, and x220. 79 * Pre-2010 and 2012 models appear to always report in mWh and 80 * are thus unaffected (tested with t42, t61, t500, x200, x300, 81 * and x230). Also, in mid-2012 Lenovo issued a BIOS update for 82 * the 2011 models that fixes the issue (tested on x220 with a 83 * post-1.29 BIOS), but as of Nov. 2012, no such update is 84 * available for the 2010 models. 85 */ 86 ACPI_BATTERY_QUIRK_THINKPAD_MAH, 87 /* for batteries reporting current capacity with design capacity 88 * on a full charge, but showing degradation in full charge cap. 89 */ 90 ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, 91 }; 92 93 struct acpi_battery { 94 struct mutex lock; 95 struct mutex sysfs_lock; 96 struct power_supply *bat; 97 struct power_supply_desc bat_desc; 98 struct acpi_device *device; 99 struct notifier_block pm_nb; 100 struct list_head list; 101 unsigned long update_time; 102 int revision; 103 int rate_now; 104 int capacity_now; 105 int voltage_now; 106 int design_capacity; 107 int full_charge_capacity; 108 int technology; 109 int design_voltage; 110 int design_capacity_warning; 111 int design_capacity_low; 112 int cycle_count; 113 int measurement_accuracy; 114 int max_sampling_time; 115 int min_sampling_time; 116 int max_averaging_interval; 117 int min_averaging_interval; 118 int capacity_granularity_1; 119 int capacity_granularity_2; 120 int alarm; 121 char model_number[32]; 122 char serial_number[32]; 123 char type[32]; 124 char oem_info[32]; 125 int state; 126 int power_unit; 127 unsigned long flags; 128 }; 129 130 #define to_acpi_battery(x) power_supply_get_drvdata(x) 131 132 static inline int acpi_battery_present(struct acpi_battery *battery) 133 { 134 return battery->device->status.battery_present; 135 } 136 137 static int acpi_battery_technology(struct acpi_battery *battery) 138 { 139 if (!strcasecmp("NiCd", battery->type)) 140 return POWER_SUPPLY_TECHNOLOGY_NiCd; 141 if (!strcasecmp("NiMH", battery->type)) 142 return POWER_SUPPLY_TECHNOLOGY_NiMH; 143 if (!strcasecmp("LION", battery->type)) 144 return POWER_SUPPLY_TECHNOLOGY_LION; 145 if (!strncasecmp("LI-ION", battery->type, 6)) 146 return POWER_SUPPLY_TECHNOLOGY_LION; 147 if (!strcasecmp("LiP", battery->type)) 148 return POWER_SUPPLY_TECHNOLOGY_LIPO; 149 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN; 150 } 151 152 static int acpi_battery_get_state(struct acpi_battery *battery); 153 154 static int acpi_battery_is_charged(struct acpi_battery *battery) 155 { 156 /* charging, discharging or critical low */ 157 if (battery->state != 0) 158 return 0; 159 160 /* battery not reporting charge */ 161 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN || 162 battery->capacity_now == 0) 163 return 0; 164 165 /* good batteries update full_charge as the batteries degrade */ 166 if (battery->full_charge_capacity == battery->capacity_now) 167 return 1; 168 169 /* fallback to using design values for broken batteries */ 170 if (battery->design_capacity <= battery->capacity_now) 171 return 1; 172 173 /* we don't do any sort of metric based on percentages */ 174 return 0; 175 } 176 177 static bool acpi_battery_is_degraded(struct acpi_battery *battery) 178 { 179 return ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) && 180 ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity) && 181 battery->full_charge_capacity < battery->design_capacity; 182 } 183 184 static int acpi_battery_handle_discharging(struct acpi_battery *battery) 185 { 186 /* 187 * Some devices wrongly report discharging if the battery's charge level 188 * was above the device's start charging threshold atm the AC adapter 189 * was plugged in and the device thus did not start a new charge cycle. 190 */ 191 if ((battery_ac_is_broken || power_supply_is_system_supplied()) && 192 battery->rate_now == 0) 193 return POWER_SUPPLY_STATUS_NOT_CHARGING; 194 195 return POWER_SUPPLY_STATUS_DISCHARGING; 196 } 197 198 static int acpi_battery_get_property(struct power_supply *psy, 199 enum power_supply_property psp, 200 union power_supply_propval *val) 201 { 202 int full_capacity = ACPI_BATTERY_VALUE_UNKNOWN, ret = 0; 203 struct acpi_battery *battery = to_acpi_battery(psy); 204 205 if (acpi_battery_present(battery)) { 206 /* run battery update only if it is present */ 207 acpi_battery_get_state(battery); 208 } else if (psp != POWER_SUPPLY_PROP_PRESENT) 209 return -ENODEV; 210 switch (psp) { 211 case POWER_SUPPLY_PROP_STATUS: 212 if (battery->state & ACPI_BATTERY_STATE_DISCHARGING) 213 val->intval = acpi_battery_handle_discharging(battery); 214 else if (battery->state & ACPI_BATTERY_STATE_CHARGING) 215 val->intval = POWER_SUPPLY_STATUS_CHARGING; 216 else if (acpi_battery_is_charged(battery)) 217 val->intval = POWER_SUPPLY_STATUS_FULL; 218 else 219 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; 220 break; 221 case POWER_SUPPLY_PROP_PRESENT: 222 val->intval = acpi_battery_present(battery); 223 break; 224 case POWER_SUPPLY_PROP_TECHNOLOGY: 225 val->intval = acpi_battery_technology(battery); 226 break; 227 case POWER_SUPPLY_PROP_CYCLE_COUNT: 228 val->intval = battery->cycle_count; 229 break; 230 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: 231 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN) 232 ret = -ENODEV; 233 else 234 val->intval = battery->design_voltage * 1000; 235 break; 236 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 237 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN) 238 ret = -ENODEV; 239 else 240 val->intval = battery->voltage_now * 1000; 241 break; 242 case POWER_SUPPLY_PROP_CURRENT_NOW: 243 case POWER_SUPPLY_PROP_POWER_NOW: 244 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN) 245 ret = -ENODEV; 246 else 247 val->intval = battery->rate_now * 1000; 248 break; 249 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 250 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: 251 if (!ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) 252 ret = -ENODEV; 253 else 254 val->intval = battery->design_capacity * 1000; 255 break; 256 case POWER_SUPPLY_PROP_CHARGE_FULL: 257 case POWER_SUPPLY_PROP_ENERGY_FULL: 258 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity)) 259 ret = -ENODEV; 260 else 261 val->intval = battery->full_charge_capacity * 1000; 262 break; 263 case POWER_SUPPLY_PROP_CHARGE_NOW: 264 case POWER_SUPPLY_PROP_ENERGY_NOW: 265 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN) 266 ret = -ENODEV; 267 else 268 val->intval = battery->capacity_now * 1000; 269 break; 270 case POWER_SUPPLY_PROP_CAPACITY: 271 if (ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity)) 272 full_capacity = battery->full_charge_capacity; 273 else if (ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) 274 full_capacity = battery->design_capacity; 275 276 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN || 277 full_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 278 ret = -ENODEV; 279 else 280 val->intval = battery->capacity_now * 100/ 281 full_capacity; 282 break; 283 case POWER_SUPPLY_PROP_CAPACITY_LEVEL: 284 if (battery->state & ACPI_BATTERY_STATE_CRITICAL) 285 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL; 286 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) && 287 (battery->capacity_now <= battery->alarm)) 288 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW; 289 else if (acpi_battery_is_charged(battery)) 290 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL; 291 else 292 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; 293 break; 294 case POWER_SUPPLY_PROP_MODEL_NAME: 295 val->strval = battery->model_number; 296 break; 297 case POWER_SUPPLY_PROP_MANUFACTURER: 298 val->strval = battery->oem_info; 299 break; 300 case POWER_SUPPLY_PROP_SERIAL_NUMBER: 301 val->strval = battery->serial_number; 302 break; 303 default: 304 ret = -EINVAL; 305 } 306 return ret; 307 } 308 309 static enum power_supply_property charge_battery_props[] = { 310 POWER_SUPPLY_PROP_STATUS, 311 POWER_SUPPLY_PROP_PRESENT, 312 POWER_SUPPLY_PROP_TECHNOLOGY, 313 POWER_SUPPLY_PROP_CYCLE_COUNT, 314 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 315 POWER_SUPPLY_PROP_VOLTAGE_NOW, 316 POWER_SUPPLY_PROP_CURRENT_NOW, 317 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 318 POWER_SUPPLY_PROP_CHARGE_FULL, 319 POWER_SUPPLY_PROP_CHARGE_NOW, 320 POWER_SUPPLY_PROP_CAPACITY, 321 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 322 POWER_SUPPLY_PROP_MODEL_NAME, 323 POWER_SUPPLY_PROP_MANUFACTURER, 324 POWER_SUPPLY_PROP_SERIAL_NUMBER, 325 }; 326 327 static enum power_supply_property charge_battery_full_cap_broken_props[] = { 328 POWER_SUPPLY_PROP_STATUS, 329 POWER_SUPPLY_PROP_PRESENT, 330 POWER_SUPPLY_PROP_TECHNOLOGY, 331 POWER_SUPPLY_PROP_CYCLE_COUNT, 332 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 333 POWER_SUPPLY_PROP_VOLTAGE_NOW, 334 POWER_SUPPLY_PROP_CURRENT_NOW, 335 POWER_SUPPLY_PROP_CHARGE_NOW, 336 POWER_SUPPLY_PROP_MODEL_NAME, 337 POWER_SUPPLY_PROP_MANUFACTURER, 338 POWER_SUPPLY_PROP_SERIAL_NUMBER, 339 }; 340 341 static enum power_supply_property energy_battery_props[] = { 342 POWER_SUPPLY_PROP_STATUS, 343 POWER_SUPPLY_PROP_PRESENT, 344 POWER_SUPPLY_PROP_TECHNOLOGY, 345 POWER_SUPPLY_PROP_CYCLE_COUNT, 346 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 347 POWER_SUPPLY_PROP_VOLTAGE_NOW, 348 POWER_SUPPLY_PROP_POWER_NOW, 349 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 350 POWER_SUPPLY_PROP_ENERGY_FULL, 351 POWER_SUPPLY_PROP_ENERGY_NOW, 352 POWER_SUPPLY_PROP_CAPACITY, 353 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 354 POWER_SUPPLY_PROP_MODEL_NAME, 355 POWER_SUPPLY_PROP_MANUFACTURER, 356 POWER_SUPPLY_PROP_SERIAL_NUMBER, 357 }; 358 359 static enum power_supply_property energy_battery_full_cap_broken_props[] = { 360 POWER_SUPPLY_PROP_STATUS, 361 POWER_SUPPLY_PROP_PRESENT, 362 POWER_SUPPLY_PROP_TECHNOLOGY, 363 POWER_SUPPLY_PROP_CYCLE_COUNT, 364 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 365 POWER_SUPPLY_PROP_VOLTAGE_NOW, 366 POWER_SUPPLY_PROP_POWER_NOW, 367 POWER_SUPPLY_PROP_ENERGY_NOW, 368 POWER_SUPPLY_PROP_MODEL_NAME, 369 POWER_SUPPLY_PROP_MANUFACTURER, 370 POWER_SUPPLY_PROP_SERIAL_NUMBER, 371 }; 372 373 /* Battery Management */ 374 struct acpi_offsets { 375 size_t offset; /* offset inside struct acpi_sbs_battery */ 376 u8 mode; /* int or string? */ 377 }; 378 379 static const struct acpi_offsets state_offsets[] = { 380 {offsetof(struct acpi_battery, state), 0}, 381 {offsetof(struct acpi_battery, rate_now), 0}, 382 {offsetof(struct acpi_battery, capacity_now), 0}, 383 {offsetof(struct acpi_battery, voltage_now), 0}, 384 }; 385 386 static const struct acpi_offsets info_offsets[] = { 387 {offsetof(struct acpi_battery, power_unit), 0}, 388 {offsetof(struct acpi_battery, design_capacity), 0}, 389 {offsetof(struct acpi_battery, full_charge_capacity), 0}, 390 {offsetof(struct acpi_battery, technology), 0}, 391 {offsetof(struct acpi_battery, design_voltage), 0}, 392 {offsetof(struct acpi_battery, design_capacity_warning), 0}, 393 {offsetof(struct acpi_battery, design_capacity_low), 0}, 394 {offsetof(struct acpi_battery, capacity_granularity_1), 0}, 395 {offsetof(struct acpi_battery, capacity_granularity_2), 0}, 396 {offsetof(struct acpi_battery, model_number), 1}, 397 {offsetof(struct acpi_battery, serial_number), 1}, 398 {offsetof(struct acpi_battery, type), 1}, 399 {offsetof(struct acpi_battery, oem_info), 1}, 400 }; 401 402 static const struct acpi_offsets extended_info_offsets[] = { 403 {offsetof(struct acpi_battery, revision), 0}, 404 {offsetof(struct acpi_battery, power_unit), 0}, 405 {offsetof(struct acpi_battery, design_capacity), 0}, 406 {offsetof(struct acpi_battery, full_charge_capacity), 0}, 407 {offsetof(struct acpi_battery, technology), 0}, 408 {offsetof(struct acpi_battery, design_voltage), 0}, 409 {offsetof(struct acpi_battery, design_capacity_warning), 0}, 410 {offsetof(struct acpi_battery, design_capacity_low), 0}, 411 {offsetof(struct acpi_battery, cycle_count), 0}, 412 {offsetof(struct acpi_battery, measurement_accuracy), 0}, 413 {offsetof(struct acpi_battery, max_sampling_time), 0}, 414 {offsetof(struct acpi_battery, min_sampling_time), 0}, 415 {offsetof(struct acpi_battery, max_averaging_interval), 0}, 416 {offsetof(struct acpi_battery, min_averaging_interval), 0}, 417 {offsetof(struct acpi_battery, capacity_granularity_1), 0}, 418 {offsetof(struct acpi_battery, capacity_granularity_2), 0}, 419 {offsetof(struct acpi_battery, model_number), 1}, 420 {offsetof(struct acpi_battery, serial_number), 1}, 421 {offsetof(struct acpi_battery, type), 1}, 422 {offsetof(struct acpi_battery, oem_info), 1}, 423 }; 424 425 static int extract_package(struct acpi_battery *battery, 426 union acpi_object *package, 427 const struct acpi_offsets *offsets, int num) 428 { 429 int i; 430 union acpi_object *element; 431 432 if (package->type != ACPI_TYPE_PACKAGE) 433 return -EFAULT; 434 for (i = 0; i < num; ++i) { 435 if (package->package.count <= i) 436 return -EFAULT; 437 element = &package->package.elements[i]; 438 if (offsets[i].mode) { 439 u8 *ptr = (u8 *)battery + offsets[i].offset; 440 441 if (element->type == ACPI_TYPE_STRING || 442 element->type == ACPI_TYPE_BUFFER) 443 strncpy(ptr, element->string.pointer, 32); 444 else if (element->type == ACPI_TYPE_INTEGER) { 445 strncpy(ptr, (u8 *)&element->integer.value, 446 sizeof(u64)); 447 ptr[sizeof(u64)] = 0; 448 } else 449 *ptr = 0; /* don't have value */ 450 } else { 451 int *x = (int *)((u8 *)battery + offsets[i].offset); 452 *x = (element->type == ACPI_TYPE_INTEGER) ? 453 element->integer.value : -1; 454 } 455 } 456 return 0; 457 } 458 459 static int acpi_battery_get_status(struct acpi_battery *battery) 460 { 461 if (acpi_bus_get_status(battery->device)) { 462 acpi_handle_info(battery->device->handle, 463 "_STA evaluation failed\n"); 464 return -ENODEV; 465 } 466 return 0; 467 } 468 469 470 static int extract_battery_info(const int use_bix, 471 struct acpi_battery *battery, 472 const struct acpi_buffer *buffer) 473 { 474 int result = -EFAULT; 475 476 if (use_bix && battery_bix_broken_package) 477 result = extract_package(battery, buffer->pointer, 478 extended_info_offsets + 1, 479 ARRAY_SIZE(extended_info_offsets) - 1); 480 else if (use_bix) 481 result = extract_package(battery, buffer->pointer, 482 extended_info_offsets, 483 ARRAY_SIZE(extended_info_offsets)); 484 else 485 result = extract_package(battery, buffer->pointer, 486 info_offsets, ARRAY_SIZE(info_offsets)); 487 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) 488 battery->full_charge_capacity = battery->design_capacity; 489 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) && 490 battery->power_unit && battery->design_voltage) { 491 battery->design_capacity = battery->design_capacity * 492 10000 / battery->design_voltage; 493 battery->full_charge_capacity = battery->full_charge_capacity * 494 10000 / battery->design_voltage; 495 battery->design_capacity_warning = 496 battery->design_capacity_warning * 497 10000 / battery->design_voltage; 498 /* Curiously, design_capacity_low, unlike the rest of them, 499 * is correct. 500 */ 501 /* capacity_granularity_* equal 1 on the systems tested, so 502 * it's impossible to tell if they would need an adjustment 503 * or not if their values were higher. 504 */ 505 } 506 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) && 507 battery->capacity_now > battery->full_charge_capacity) 508 battery->capacity_now = battery->full_charge_capacity; 509 510 return result; 511 } 512 513 static int acpi_battery_get_info(struct acpi_battery *battery) 514 { 515 const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags); 516 int use_bix; 517 int result = -ENODEV; 518 519 if (!acpi_battery_present(battery)) 520 return 0; 521 522 523 for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) { 524 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 525 acpi_status status = AE_ERROR; 526 527 mutex_lock(&battery->lock); 528 status = acpi_evaluate_object(battery->device->handle, 529 use_bix ? "_BIX":"_BIF", 530 NULL, &buffer); 531 mutex_unlock(&battery->lock); 532 533 if (ACPI_FAILURE(status)) { 534 acpi_handle_info(battery->device->handle, 535 "%s evaluation failed: %s\n", 536 use_bix ? "_BIX":"_BIF", 537 acpi_format_exception(status)); 538 } else { 539 result = extract_battery_info(use_bix, 540 battery, 541 &buffer); 542 543 kfree(buffer.pointer); 544 break; 545 } 546 } 547 548 if (!result && !use_bix && xinfo) 549 pr_warn(FW_BUG "The _BIX method is broken, using _BIF.\n"); 550 551 return result; 552 } 553 554 static int acpi_battery_get_state(struct acpi_battery *battery) 555 { 556 int result = 0; 557 acpi_status status = 0; 558 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 559 560 if (!acpi_battery_present(battery)) 561 return 0; 562 563 if (battery->update_time && 564 time_before(jiffies, battery->update_time + 565 msecs_to_jiffies(cache_time))) 566 return 0; 567 568 mutex_lock(&battery->lock); 569 status = acpi_evaluate_object(battery->device->handle, "_BST", 570 NULL, &buffer); 571 mutex_unlock(&battery->lock); 572 573 if (ACPI_FAILURE(status)) { 574 acpi_handle_info(battery->device->handle, 575 "_BST evaluation failed: %s", 576 acpi_format_exception(status)); 577 return -ENODEV; 578 } 579 580 result = extract_package(battery, buffer.pointer, 581 state_offsets, ARRAY_SIZE(state_offsets)); 582 battery->update_time = jiffies; 583 kfree(buffer.pointer); 584 585 /* For buggy DSDTs that report negative 16-bit values for either 586 * charging or discharging current and/or report 0 as 65536 587 * due to bad math. 588 */ 589 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA && 590 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN && 591 (s16)(battery->rate_now) < 0) { 592 battery->rate_now = abs((s16)battery->rate_now); 593 pr_warn_once(FW_BUG "(dis)charge rate invalid.\n"); 594 } 595 596 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags) 597 && battery->capacity_now >= 0 && battery->capacity_now <= 100) 598 battery->capacity_now = (battery->capacity_now * 599 battery->full_charge_capacity) / 100; 600 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) && 601 battery->power_unit && battery->design_voltage) { 602 battery->capacity_now = battery->capacity_now * 603 10000 / battery->design_voltage; 604 } 605 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) && 606 battery->capacity_now > battery->full_charge_capacity) 607 battery->capacity_now = battery->full_charge_capacity; 608 609 return result; 610 } 611 612 static int acpi_battery_set_alarm(struct acpi_battery *battery) 613 { 614 acpi_status status = 0; 615 616 if (!acpi_battery_present(battery) || 617 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags)) 618 return -ENODEV; 619 620 mutex_lock(&battery->lock); 621 status = acpi_execute_simple_method(battery->device->handle, "_BTP", 622 battery->alarm); 623 mutex_unlock(&battery->lock); 624 625 if (ACPI_FAILURE(status)) 626 return -ENODEV; 627 628 acpi_handle_debug(battery->device->handle, "Alarm set to %d\n", 629 battery->alarm); 630 631 return 0; 632 } 633 634 static int acpi_battery_init_alarm(struct acpi_battery *battery) 635 { 636 /* See if alarms are supported, and if so, set default */ 637 if (!acpi_has_method(battery->device->handle, "_BTP")) { 638 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags); 639 return 0; 640 } 641 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags); 642 if (!battery->alarm) 643 battery->alarm = battery->design_capacity_warning; 644 return acpi_battery_set_alarm(battery); 645 } 646 647 static ssize_t acpi_battery_alarm_show(struct device *dev, 648 struct device_attribute *attr, 649 char *buf) 650 { 651 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 652 653 return sprintf(buf, "%d\n", battery->alarm * 1000); 654 } 655 656 static ssize_t acpi_battery_alarm_store(struct device *dev, 657 struct device_attribute *attr, 658 const char *buf, size_t count) 659 { 660 unsigned long x; 661 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 662 663 if (sscanf(buf, "%lu\n", &x) == 1) 664 battery->alarm = x/1000; 665 if (acpi_battery_present(battery)) 666 acpi_battery_set_alarm(battery); 667 return count; 668 } 669 670 static const struct device_attribute alarm_attr = { 671 .attr = {.name = "alarm", .mode = 0644}, 672 .show = acpi_battery_alarm_show, 673 .store = acpi_battery_alarm_store, 674 }; 675 676 /* 677 * The Battery Hooking API 678 * 679 * This API is used inside other drivers that need to expose 680 * platform-specific behaviour within the generic driver in a 681 * generic way. 682 * 683 */ 684 685 static LIST_HEAD(acpi_battery_list); 686 static LIST_HEAD(battery_hook_list); 687 static DEFINE_MUTEX(hook_mutex); 688 689 static void __battery_hook_unregister(struct acpi_battery_hook *hook, int lock) 690 { 691 struct acpi_battery *battery; 692 /* 693 * In order to remove a hook, we first need to 694 * de-register all the batteries that are registered. 695 */ 696 if (lock) 697 mutex_lock(&hook_mutex); 698 list_for_each_entry(battery, &acpi_battery_list, list) { 699 if (!hook->remove_battery(battery->bat, hook)) 700 power_supply_changed(battery->bat); 701 } 702 list_del(&hook->list); 703 if (lock) 704 mutex_unlock(&hook_mutex); 705 pr_info("extension unregistered: %s\n", hook->name); 706 } 707 708 void battery_hook_unregister(struct acpi_battery_hook *hook) 709 { 710 __battery_hook_unregister(hook, 1); 711 } 712 EXPORT_SYMBOL_GPL(battery_hook_unregister); 713 714 void battery_hook_register(struct acpi_battery_hook *hook) 715 { 716 struct acpi_battery *battery; 717 718 mutex_lock(&hook_mutex); 719 INIT_LIST_HEAD(&hook->list); 720 list_add(&hook->list, &battery_hook_list); 721 /* 722 * Now that the driver is registered, we need 723 * to notify the hook that a battery is available 724 * for each battery, so that the driver may add 725 * its attributes. 726 */ 727 list_for_each_entry(battery, &acpi_battery_list, list) { 728 if (hook->add_battery(battery->bat, hook)) { 729 /* 730 * If a add-battery returns non-zero, 731 * the registration of the extension has failed, 732 * and we will not add it to the list of loaded 733 * hooks. 734 */ 735 pr_err("extension failed to load: %s", hook->name); 736 __battery_hook_unregister(hook, 0); 737 goto end; 738 } 739 740 power_supply_changed(battery->bat); 741 } 742 pr_info("new extension: %s\n", hook->name); 743 end: 744 mutex_unlock(&hook_mutex); 745 } 746 EXPORT_SYMBOL_GPL(battery_hook_register); 747 748 /* 749 * This function gets called right after the battery sysfs 750 * attributes have been added, so that the drivers that 751 * define custom sysfs attributes can add their own. 752 */ 753 static void battery_hook_add_battery(struct acpi_battery *battery) 754 { 755 struct acpi_battery_hook *hook_node, *tmp; 756 757 mutex_lock(&hook_mutex); 758 INIT_LIST_HEAD(&battery->list); 759 list_add(&battery->list, &acpi_battery_list); 760 /* 761 * Since we added a new battery to the list, we need to 762 * iterate over the hooks and call add_battery for each 763 * hook that was registered. This usually happens 764 * when a battery gets hotplugged or initialized 765 * during the battery module initialization. 766 */ 767 list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) { 768 if (hook_node->add_battery(battery->bat, hook_node)) { 769 /* 770 * The notification of the extensions has failed, to 771 * prevent further errors we will unload the extension. 772 */ 773 pr_err("error in extension, unloading: %s", 774 hook_node->name); 775 __battery_hook_unregister(hook_node, 0); 776 } 777 } 778 mutex_unlock(&hook_mutex); 779 } 780 781 static void battery_hook_remove_battery(struct acpi_battery *battery) 782 { 783 struct acpi_battery_hook *hook; 784 785 mutex_lock(&hook_mutex); 786 /* 787 * Before removing the hook, we need to remove all 788 * custom attributes from the battery. 789 */ 790 list_for_each_entry(hook, &battery_hook_list, list) { 791 hook->remove_battery(battery->bat, hook); 792 } 793 /* Then, just remove the battery from the list */ 794 list_del(&battery->list); 795 mutex_unlock(&hook_mutex); 796 } 797 798 static void __exit battery_hook_exit(void) 799 { 800 struct acpi_battery_hook *hook; 801 struct acpi_battery_hook *ptr; 802 /* 803 * At this point, the acpi_bus_unregister_driver() 804 * has called remove for all batteries. We just 805 * need to remove the hooks. 806 */ 807 list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) { 808 __battery_hook_unregister(hook, 1); 809 } 810 mutex_destroy(&hook_mutex); 811 } 812 813 static int sysfs_add_battery(struct acpi_battery *battery) 814 { 815 struct power_supply_config psy_cfg = { .drv_data = battery, }; 816 bool full_cap_broken = false; 817 818 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) && 819 !ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) 820 full_cap_broken = true; 821 822 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) { 823 if (full_cap_broken) { 824 battery->bat_desc.properties = 825 charge_battery_full_cap_broken_props; 826 battery->bat_desc.num_properties = 827 ARRAY_SIZE(charge_battery_full_cap_broken_props); 828 } else { 829 battery->bat_desc.properties = charge_battery_props; 830 battery->bat_desc.num_properties = 831 ARRAY_SIZE(charge_battery_props); 832 } 833 } else { 834 if (full_cap_broken) { 835 battery->bat_desc.properties = 836 energy_battery_full_cap_broken_props; 837 battery->bat_desc.num_properties = 838 ARRAY_SIZE(energy_battery_full_cap_broken_props); 839 } else { 840 battery->bat_desc.properties = energy_battery_props; 841 battery->bat_desc.num_properties = 842 ARRAY_SIZE(energy_battery_props); 843 } 844 } 845 846 battery->bat_desc.name = acpi_device_bid(battery->device); 847 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY; 848 battery->bat_desc.get_property = acpi_battery_get_property; 849 850 battery->bat = power_supply_register_no_ws(&battery->device->dev, 851 &battery->bat_desc, &psy_cfg); 852 853 if (IS_ERR(battery->bat)) { 854 int result = PTR_ERR(battery->bat); 855 856 battery->bat = NULL; 857 return result; 858 } 859 battery_hook_add_battery(battery); 860 return device_create_file(&battery->bat->dev, &alarm_attr); 861 } 862 863 static void sysfs_remove_battery(struct acpi_battery *battery) 864 { 865 mutex_lock(&battery->sysfs_lock); 866 if (!battery->bat) { 867 mutex_unlock(&battery->sysfs_lock); 868 return; 869 } 870 battery_hook_remove_battery(battery); 871 device_remove_file(&battery->bat->dev, &alarm_attr); 872 power_supply_unregister(battery->bat); 873 battery->bat = NULL; 874 mutex_unlock(&battery->sysfs_lock); 875 } 876 877 static void find_battery(const struct dmi_header *dm, void *private) 878 { 879 struct acpi_battery *battery = (struct acpi_battery *)private; 880 /* Note: the hardcoded offsets below have been extracted from 881 * the source code of dmidecode. 882 */ 883 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) { 884 const u8 *dmi_data = (const u8 *)(dm + 1); 885 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6)); 886 887 if (dm->length >= 18) 888 dmi_capacity *= dmi_data[17]; 889 if (battery->design_capacity * battery->design_voltage / 1000 890 != dmi_capacity && 891 battery->design_capacity * 10 == dmi_capacity) 892 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, 893 &battery->flags); 894 } 895 } 896 897 /* 898 * According to the ACPI spec, some kinds of primary batteries can 899 * report percentage battery remaining capacity directly to OS. 900 * In this case, it reports the Last Full Charged Capacity == 100 901 * and BatteryPresentRate == 0xFFFFFFFF. 902 * 903 * Now we found some battery reports percentage remaining capacity 904 * even if it's rechargeable. 905 * https://bugzilla.kernel.org/show_bug.cgi?id=15979 906 * 907 * Handle this correctly so that they won't break userspace. 908 */ 909 static void acpi_battery_quirks(struct acpi_battery *battery) 910 { 911 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) 912 return; 913 914 if (battery->full_charge_capacity == 100 && 915 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN && 916 battery->capacity_now >= 0 && battery->capacity_now <= 100) { 917 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags); 918 battery->full_charge_capacity = battery->design_capacity; 919 battery->capacity_now = (battery->capacity_now * 920 battery->full_charge_capacity) / 100; 921 } 922 923 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags)) 924 return; 925 926 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) { 927 const char *s; 928 929 s = dmi_get_system_info(DMI_PRODUCT_VERSION); 930 if (s && !strncasecmp(s, "ThinkPad", 8)) { 931 dmi_walk(find_battery, battery); 932 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, 933 &battery->flags) && 934 battery->design_voltage) { 935 battery->design_capacity = 936 battery->design_capacity * 937 10000 / battery->design_voltage; 938 battery->full_charge_capacity = 939 battery->full_charge_capacity * 940 10000 / battery->design_voltage; 941 battery->design_capacity_warning = 942 battery->design_capacity_warning * 943 10000 / battery->design_voltage; 944 battery->capacity_now = battery->capacity_now * 945 10000 / battery->design_voltage; 946 } 947 } 948 } 949 950 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags)) 951 return; 952 953 if (acpi_battery_is_degraded(battery) && 954 battery->capacity_now > battery->full_charge_capacity) { 955 set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags); 956 battery->capacity_now = battery->full_charge_capacity; 957 } 958 } 959 960 static int acpi_battery_update(struct acpi_battery *battery, bool resume) 961 { 962 int result = acpi_battery_get_status(battery); 963 964 if (result) 965 return result; 966 967 if (!acpi_battery_present(battery)) { 968 sysfs_remove_battery(battery); 969 battery->update_time = 0; 970 return 0; 971 } 972 973 if (resume) 974 return 0; 975 976 if (!battery->update_time) { 977 result = acpi_battery_get_info(battery); 978 if (result) 979 return result; 980 acpi_battery_init_alarm(battery); 981 } 982 983 result = acpi_battery_get_state(battery); 984 if (result) 985 return result; 986 acpi_battery_quirks(battery); 987 988 if (!battery->bat) { 989 result = sysfs_add_battery(battery); 990 if (result) 991 return result; 992 } 993 994 /* 995 * Wakeup the system if battery is critical low 996 * or lower than the alarm level 997 */ 998 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) || 999 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) && 1000 (battery->capacity_now <= battery->alarm))) 1001 acpi_pm_wakeup_event(&battery->device->dev); 1002 1003 return result; 1004 } 1005 1006 static void acpi_battery_refresh(struct acpi_battery *battery) 1007 { 1008 int power_unit; 1009 1010 if (!battery->bat) 1011 return; 1012 1013 power_unit = battery->power_unit; 1014 1015 acpi_battery_get_info(battery); 1016 1017 if (power_unit == battery->power_unit) 1018 return; 1019 1020 /* The battery has changed its reporting units. */ 1021 sysfs_remove_battery(battery); 1022 sysfs_add_battery(battery); 1023 } 1024 1025 /* Driver Interface */ 1026 static void acpi_battery_notify(struct acpi_device *device, u32 event) 1027 { 1028 struct acpi_battery *battery = acpi_driver_data(device); 1029 struct power_supply *old; 1030 1031 if (!battery) 1032 return; 1033 old = battery->bat; 1034 /* 1035 * On Acer Aspire V5-573G notifications are sometimes triggered too 1036 * early. For example, when AC is unplugged and notification is 1037 * triggered, battery state is still reported as "Full", and changes to 1038 * "Discharging" only after short delay, without any notification. 1039 */ 1040 if (battery_notification_delay_ms > 0) 1041 msleep(battery_notification_delay_ms); 1042 if (event == ACPI_BATTERY_NOTIFY_INFO) 1043 acpi_battery_refresh(battery); 1044 acpi_battery_update(battery, false); 1045 acpi_bus_generate_netlink_event(device->pnp.device_class, 1046 dev_name(&device->dev), event, 1047 acpi_battery_present(battery)); 1048 acpi_notifier_call_chain(device, event, acpi_battery_present(battery)); 1049 /* acpi_battery_update could remove power_supply object */ 1050 if (old && battery->bat) 1051 power_supply_changed(battery->bat); 1052 } 1053 1054 static int battery_notify(struct notifier_block *nb, 1055 unsigned long mode, void *_unused) 1056 { 1057 struct acpi_battery *battery = container_of(nb, struct acpi_battery, 1058 pm_nb); 1059 int result; 1060 1061 switch (mode) { 1062 case PM_POST_HIBERNATION: 1063 case PM_POST_SUSPEND: 1064 if (!acpi_battery_present(battery)) 1065 return 0; 1066 1067 if (battery->bat) { 1068 acpi_battery_refresh(battery); 1069 } else { 1070 result = acpi_battery_get_info(battery); 1071 if (result) 1072 return result; 1073 1074 result = sysfs_add_battery(battery); 1075 if (result) 1076 return result; 1077 } 1078 1079 acpi_battery_init_alarm(battery); 1080 acpi_battery_get_state(battery); 1081 break; 1082 } 1083 1084 return 0; 1085 } 1086 1087 static int __init 1088 battery_bix_broken_package_quirk(const struct dmi_system_id *d) 1089 { 1090 battery_bix_broken_package = 1; 1091 return 0; 1092 } 1093 1094 static int __init 1095 battery_notification_delay_quirk(const struct dmi_system_id *d) 1096 { 1097 battery_notification_delay_ms = 1000; 1098 return 0; 1099 } 1100 1101 static int __init 1102 battery_ac_is_broken_quirk(const struct dmi_system_id *d) 1103 { 1104 battery_ac_is_broken = 1; 1105 return 0; 1106 } 1107 1108 static const struct dmi_system_id bat_dmi_table[] __initconst = { 1109 { 1110 /* NEC LZ750/LS */ 1111 .callback = battery_bix_broken_package_quirk, 1112 .matches = { 1113 DMI_MATCH(DMI_SYS_VENDOR, "NEC"), 1114 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"), 1115 }, 1116 }, 1117 { 1118 /* Acer Aspire V5-573G */ 1119 .callback = battery_notification_delay_quirk, 1120 .matches = { 1121 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 1122 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"), 1123 }, 1124 }, 1125 { 1126 /* Point of View mobii wintab p800w */ 1127 .callback = battery_ac_is_broken_quirk, 1128 .matches = { 1129 DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"), 1130 DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"), 1131 DMI_MATCH(DMI_BIOS_VERSION, "3BAIR1013"), 1132 /* Above matches are too generic, add bios-date match */ 1133 DMI_MATCH(DMI_BIOS_DATE, "08/22/2014"), 1134 }, 1135 }, 1136 { 1137 /* Microsoft Surface Go 3 */ 1138 .callback = battery_notification_delay_quirk, 1139 .matches = { 1140 DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), 1141 DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go 3"), 1142 }, 1143 }, 1144 {}, 1145 }; 1146 1147 /* 1148 * Some machines'(E,G Lenovo Z480) ECs are not stable 1149 * during boot up and this causes battery driver fails to be 1150 * probed due to failure of getting battery information 1151 * from EC sometimes. After several retries, the operation 1152 * may work. So add retry code here and 20ms sleep between 1153 * every retries. 1154 */ 1155 static int acpi_battery_update_retry(struct acpi_battery *battery) 1156 { 1157 int retry, ret; 1158 1159 for (retry = 5; retry; retry--) { 1160 ret = acpi_battery_update(battery, false); 1161 if (!ret) 1162 break; 1163 1164 msleep(20); 1165 } 1166 return ret; 1167 } 1168 1169 static int acpi_battery_add(struct acpi_device *device) 1170 { 1171 int result = 0; 1172 struct acpi_battery *battery = NULL; 1173 1174 if (!device) 1175 return -EINVAL; 1176 1177 if (device->dep_unmet) 1178 return -EPROBE_DEFER; 1179 1180 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL); 1181 if (!battery) 1182 return -ENOMEM; 1183 battery->device = device; 1184 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME); 1185 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS); 1186 device->driver_data = battery; 1187 mutex_init(&battery->lock); 1188 mutex_init(&battery->sysfs_lock); 1189 if (acpi_has_method(battery->device->handle, "_BIX")) 1190 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags); 1191 1192 result = acpi_battery_update_retry(battery); 1193 if (result) 1194 goto fail; 1195 1196 pr_info("Slot [%s] (battery %s)\n", acpi_device_bid(device), 1197 device->status.battery_present ? "present" : "absent"); 1198 1199 battery->pm_nb.notifier_call = battery_notify; 1200 register_pm_notifier(&battery->pm_nb); 1201 1202 device_init_wakeup(&device->dev, 1); 1203 1204 return result; 1205 1206 fail: 1207 sysfs_remove_battery(battery); 1208 mutex_destroy(&battery->lock); 1209 mutex_destroy(&battery->sysfs_lock); 1210 kfree(battery); 1211 return result; 1212 } 1213 1214 static void acpi_battery_remove(struct acpi_device *device) 1215 { 1216 struct acpi_battery *battery = NULL; 1217 1218 if (!device || !acpi_driver_data(device)) 1219 return; 1220 device_init_wakeup(&device->dev, 0); 1221 battery = acpi_driver_data(device); 1222 unregister_pm_notifier(&battery->pm_nb); 1223 sysfs_remove_battery(battery); 1224 mutex_destroy(&battery->lock); 1225 mutex_destroy(&battery->sysfs_lock); 1226 kfree(battery); 1227 } 1228 1229 #ifdef CONFIG_PM_SLEEP 1230 /* this is needed to learn about changes made in suspended state */ 1231 static int acpi_battery_resume(struct device *dev) 1232 { 1233 struct acpi_battery *battery; 1234 1235 if (!dev) 1236 return -EINVAL; 1237 1238 battery = acpi_driver_data(to_acpi_device(dev)); 1239 if (!battery) 1240 return -EINVAL; 1241 1242 battery->update_time = 0; 1243 acpi_battery_update(battery, true); 1244 return 0; 1245 } 1246 #else 1247 #define acpi_battery_resume NULL 1248 #endif 1249 1250 static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume); 1251 1252 static struct acpi_driver acpi_battery_driver = { 1253 .name = "battery", 1254 .class = ACPI_BATTERY_CLASS, 1255 .ids = battery_device_ids, 1256 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS, 1257 .ops = { 1258 .add = acpi_battery_add, 1259 .remove = acpi_battery_remove, 1260 .notify = acpi_battery_notify, 1261 }, 1262 .drv.pm = &acpi_battery_pm, 1263 }; 1264 1265 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie) 1266 { 1267 int result; 1268 1269 if (acpi_quirk_skip_acpi_ac_and_battery()) 1270 return; 1271 1272 dmi_check_system(bat_dmi_table); 1273 1274 result = acpi_bus_register_driver(&acpi_battery_driver); 1275 battery_driver_registered = (result == 0); 1276 } 1277 1278 static int __init acpi_battery_init(void) 1279 { 1280 if (acpi_disabled) 1281 return -ENODEV; 1282 1283 async_cookie = async_schedule(acpi_battery_init_async, NULL); 1284 return 0; 1285 } 1286 1287 static void __exit acpi_battery_exit(void) 1288 { 1289 async_synchronize_cookie(async_cookie + 1); 1290 if (battery_driver_registered) { 1291 acpi_bus_unregister_driver(&acpi_battery_driver); 1292 battery_hook_exit(); 1293 } 1294 } 1295 1296 module_init(acpi_battery_init); 1297 module_exit(acpi_battery_exit); 1298