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/delay.h> 14 #include <linux/dmi.h> 15 #include <linux/jiffies.h> 16 #include <linux/kernel.h> 17 #include <linux/list.h> 18 #include <linux/module.h> 19 #include <linux/mutex.h> 20 #include <linux/slab.h> 21 #include <linux/suspend.h> 22 #include <linux/types.h> 23 24 #include <linux/unaligned.h> 25 26 #include <linux/acpi.h> 27 #include <linux/power_supply.h> 28 29 #include <acpi/battery.h> 30 31 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF 32 #define ACPI_BATTERY_CAPACITY_VALID(capacity) \ 33 ((capacity) != 0 && (capacity) != ACPI_BATTERY_VALUE_UNKNOWN) 34 35 #define ACPI_BATTERY_DEVICE_NAME "Battery" 36 37 /* Battery power unit: 0 means mW, 1 means mA */ 38 #define ACPI_BATTERY_POWER_UNIT_MA 1 39 40 #define ACPI_BATTERY_STATE_DISCHARGING 0x1 41 #define ACPI_BATTERY_STATE_CHARGING 0x2 42 #define ACPI_BATTERY_STATE_CRITICAL 0x4 43 #define ACPI_BATTERY_STATE_CHARGE_LIMITING 0x8 44 45 #define MAX_STRING_LENGTH 64 46 47 MODULE_AUTHOR("Paul Diefenbaugh"); 48 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>"); 49 MODULE_DESCRIPTION("ACPI Battery Driver"); 50 MODULE_LICENSE("GPL"); 51 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 update_lock; 95 struct power_supply *bat; 96 struct power_supply_desc bat_desc; 97 struct acpi_device *device; 98 struct notifier_block pm_nb; 99 struct list_head list; 100 unsigned long update_time; 101 int revision; 102 int rate_now; 103 int capacity_now; 104 int voltage_now; 105 int design_capacity; 106 int full_charge_capacity; 107 int technology; 108 int design_voltage; 109 int design_capacity_warning; 110 int design_capacity_low; 111 int cycle_count; 112 int measurement_accuracy; 113 int max_sampling_time; 114 int min_sampling_time; 115 int max_averaging_interval; 116 int min_averaging_interval; 117 int capacity_granularity_1; 118 int capacity_granularity_2; 119 int alarm; 120 char model_number[MAX_STRING_LENGTH]; 121 char serial_number[MAX_STRING_LENGTH]; 122 char type[MAX_STRING_LENGTH]; 123 char oem_info[MAX_STRING_LENGTH]; 124 int state; 125 int power_unit; 126 unsigned long flags; 127 }; 128 129 #define to_acpi_battery(x) power_supply_get_drvdata(x) 130 131 static inline int acpi_battery_present(struct acpi_battery *battery) 132 { 133 return battery->device->status.battery_present; 134 } 135 136 static int acpi_battery_technology(struct acpi_battery *battery) 137 { 138 if (!strcasecmp("NiCd", battery->type)) 139 return POWER_SUPPLY_TECHNOLOGY_NiCd; 140 if (!strcasecmp("NiMH", battery->type)) 141 return POWER_SUPPLY_TECHNOLOGY_NiMH; 142 if (!strcasecmp("LION", battery->type)) 143 return POWER_SUPPLY_TECHNOLOGY_LION; 144 if (!strncasecmp("LI-ION", battery->type, 6)) 145 return POWER_SUPPLY_TECHNOLOGY_LION; 146 if (!strcasecmp("LiP", battery->type)) 147 return POWER_SUPPLY_TECHNOLOGY_LIPO; 148 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN; 149 } 150 151 static int acpi_battery_get_state(struct acpi_battery *battery); 152 153 static int acpi_battery_is_charged(struct acpi_battery *battery) 154 { 155 /* charging, discharging, critical low or charge limited */ 156 if (battery->state != 0) 157 return 0; 158 159 /* battery not reporting charge */ 160 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN || 161 battery->capacity_now == 0) 162 return 0; 163 164 /* good batteries update full_charge as the batteries degrade */ 165 if (battery->full_charge_capacity == battery->capacity_now) 166 return 1; 167 168 /* fallback to using design values for broken batteries */ 169 if (battery->design_capacity <= battery->capacity_now) 170 return 1; 171 172 /* we don't do any sort of metric based on percentages */ 173 return 0; 174 } 175 176 static bool acpi_battery_is_degraded(struct acpi_battery *battery) 177 { 178 return ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) && 179 ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity) && 180 battery->full_charge_capacity < battery->design_capacity; 181 } 182 183 static int acpi_battery_handle_discharging(struct acpi_battery *battery) 184 { 185 /* 186 * Some devices wrongly report discharging if the battery's charge level 187 * was above the device's start charging threshold atm the AC adapter 188 * was plugged in and the device thus did not start a new charge cycle. 189 */ 190 if ((battery_ac_is_broken || power_supply_is_system_supplied()) && 191 battery->rate_now == 0) 192 return POWER_SUPPLY_STATUS_NOT_CHARGING; 193 194 return POWER_SUPPLY_STATUS_DISCHARGING; 195 } 196 197 static int acpi_battery_get_property(struct power_supply *psy, 198 enum power_supply_property psp, 199 union power_supply_propval *val) 200 { 201 int full_capacity = ACPI_BATTERY_VALUE_UNKNOWN, ret = 0; 202 struct acpi_battery *battery = to_acpi_battery(psy); 203 204 if (acpi_battery_present(battery)) { 205 /* run battery update only if it is present */ 206 acpi_battery_get_state(battery); 207 } else if (psp != POWER_SUPPLY_PROP_PRESENT) 208 return -ENODEV; 209 switch (psp) { 210 case POWER_SUPPLY_PROP_STATUS: 211 if (battery->state & ACPI_BATTERY_STATE_DISCHARGING) 212 val->intval = acpi_battery_handle_discharging(battery); 213 else if (battery->state & ACPI_BATTERY_STATE_CHARGING) 214 val->intval = POWER_SUPPLY_STATUS_CHARGING; 215 else if (battery->state & ACPI_BATTERY_STATE_CHARGE_LIMITING) 216 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; 217 else if (acpi_battery_is_charged(battery)) 218 val->intval = POWER_SUPPLY_STATUS_FULL; 219 else 220 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; 221 break; 222 case POWER_SUPPLY_PROP_PRESENT: 223 val->intval = acpi_battery_present(battery); 224 break; 225 case POWER_SUPPLY_PROP_TECHNOLOGY: 226 val->intval = acpi_battery_technology(battery); 227 break; 228 case POWER_SUPPLY_PROP_CYCLE_COUNT: 229 val->intval = battery->cycle_count; 230 break; 231 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: 232 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN) 233 ret = -ENODEV; 234 else 235 val->intval = battery->design_voltage * 1000; 236 break; 237 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 238 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN) 239 ret = -ENODEV; 240 else 241 val->intval = battery->voltage_now * 1000; 242 break; 243 case POWER_SUPPLY_PROP_CURRENT_NOW: 244 case POWER_SUPPLY_PROP_POWER_NOW: 245 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN) 246 ret = -ENODEV; 247 else 248 val->intval = battery->rate_now * 1000; 249 break; 250 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 251 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: 252 if (!ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) 253 ret = -ENODEV; 254 else 255 val->intval = battery->design_capacity * 1000; 256 break; 257 case POWER_SUPPLY_PROP_CHARGE_FULL: 258 case POWER_SUPPLY_PROP_ENERGY_FULL: 259 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity)) 260 ret = -ENODEV; 261 else 262 val->intval = battery->full_charge_capacity * 1000; 263 break; 264 case POWER_SUPPLY_PROP_CHARGE_NOW: 265 case POWER_SUPPLY_PROP_ENERGY_NOW: 266 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN) 267 ret = -ENODEV; 268 else 269 val->intval = battery->capacity_now * 1000; 270 break; 271 case POWER_SUPPLY_PROP_CAPACITY: 272 if (ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity)) 273 full_capacity = battery->full_charge_capacity; 274 else if (ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) 275 full_capacity = battery->design_capacity; 276 277 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN || 278 full_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 279 ret = -ENODEV; 280 else 281 val->intval = DIV_ROUND_CLOSEST_ULL(battery->capacity_now * 100ULL, 282 full_capacity); 283 break; 284 case POWER_SUPPLY_PROP_CAPACITY_LEVEL: 285 if (battery->state & ACPI_BATTERY_STATE_CRITICAL) 286 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL; 287 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) && 288 (battery->capacity_now <= battery->alarm)) 289 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW; 290 else if (acpi_battery_is_charged(battery)) 291 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL; 292 else 293 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; 294 break; 295 case POWER_SUPPLY_PROP_MODEL_NAME: 296 val->strval = battery->model_number; 297 break; 298 case POWER_SUPPLY_PROP_MANUFACTURER: 299 val->strval = battery->oem_info; 300 break; 301 case POWER_SUPPLY_PROP_SERIAL_NUMBER: 302 val->strval = battery->serial_number; 303 break; 304 default: 305 ret = -EINVAL; 306 } 307 return ret; 308 } 309 310 static const enum power_supply_property charge_battery_props[] = { 311 POWER_SUPPLY_PROP_STATUS, 312 POWER_SUPPLY_PROP_PRESENT, 313 POWER_SUPPLY_PROP_TECHNOLOGY, 314 POWER_SUPPLY_PROP_CYCLE_COUNT, 315 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 316 POWER_SUPPLY_PROP_VOLTAGE_NOW, 317 POWER_SUPPLY_PROP_CURRENT_NOW, 318 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 319 POWER_SUPPLY_PROP_CHARGE_FULL, 320 POWER_SUPPLY_PROP_CHARGE_NOW, 321 POWER_SUPPLY_PROP_CAPACITY, 322 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 323 POWER_SUPPLY_PROP_MODEL_NAME, 324 POWER_SUPPLY_PROP_MANUFACTURER, 325 POWER_SUPPLY_PROP_SERIAL_NUMBER, 326 }; 327 328 static const enum power_supply_property charge_battery_full_cap_broken_props[] = { 329 POWER_SUPPLY_PROP_STATUS, 330 POWER_SUPPLY_PROP_PRESENT, 331 POWER_SUPPLY_PROP_TECHNOLOGY, 332 POWER_SUPPLY_PROP_CYCLE_COUNT, 333 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 334 POWER_SUPPLY_PROP_VOLTAGE_NOW, 335 POWER_SUPPLY_PROP_CURRENT_NOW, 336 POWER_SUPPLY_PROP_CHARGE_NOW, 337 POWER_SUPPLY_PROP_MODEL_NAME, 338 POWER_SUPPLY_PROP_MANUFACTURER, 339 POWER_SUPPLY_PROP_SERIAL_NUMBER, 340 }; 341 342 static const enum power_supply_property energy_battery_props[] = { 343 POWER_SUPPLY_PROP_STATUS, 344 POWER_SUPPLY_PROP_PRESENT, 345 POWER_SUPPLY_PROP_TECHNOLOGY, 346 POWER_SUPPLY_PROP_CYCLE_COUNT, 347 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 348 POWER_SUPPLY_PROP_VOLTAGE_NOW, 349 POWER_SUPPLY_PROP_POWER_NOW, 350 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 351 POWER_SUPPLY_PROP_ENERGY_FULL, 352 POWER_SUPPLY_PROP_ENERGY_NOW, 353 POWER_SUPPLY_PROP_CAPACITY, 354 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 355 POWER_SUPPLY_PROP_MODEL_NAME, 356 POWER_SUPPLY_PROP_MANUFACTURER, 357 POWER_SUPPLY_PROP_SERIAL_NUMBER, 358 }; 359 360 static const enum power_supply_property energy_battery_full_cap_broken_props[] = { 361 POWER_SUPPLY_PROP_STATUS, 362 POWER_SUPPLY_PROP_PRESENT, 363 POWER_SUPPLY_PROP_TECHNOLOGY, 364 POWER_SUPPLY_PROP_CYCLE_COUNT, 365 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 366 POWER_SUPPLY_PROP_VOLTAGE_NOW, 367 POWER_SUPPLY_PROP_POWER_NOW, 368 POWER_SUPPLY_PROP_ENERGY_NOW, 369 POWER_SUPPLY_PROP_MODEL_NAME, 370 POWER_SUPPLY_PROP_MANUFACTURER, 371 POWER_SUPPLY_PROP_SERIAL_NUMBER, 372 }; 373 374 /* Battery Management */ 375 struct acpi_offsets { 376 size_t offset; /* offset inside struct acpi_sbs_battery */ 377 u8 mode; /* int or string? */ 378 }; 379 380 static const struct acpi_offsets state_offsets[] = { 381 {offsetof(struct acpi_battery, state), 0}, 382 {offsetof(struct acpi_battery, rate_now), 0}, 383 {offsetof(struct acpi_battery, capacity_now), 0}, 384 {offsetof(struct acpi_battery, voltage_now), 0}, 385 }; 386 387 static const struct acpi_offsets info_offsets[] = { 388 {offsetof(struct acpi_battery, power_unit), 0}, 389 {offsetof(struct acpi_battery, design_capacity), 0}, 390 {offsetof(struct acpi_battery, full_charge_capacity), 0}, 391 {offsetof(struct acpi_battery, technology), 0}, 392 {offsetof(struct acpi_battery, design_voltage), 0}, 393 {offsetof(struct acpi_battery, design_capacity_warning), 0}, 394 {offsetof(struct acpi_battery, design_capacity_low), 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 }; 402 403 static const struct acpi_offsets extended_info_offsets[] = { 404 {offsetof(struct acpi_battery, revision), 0}, 405 {offsetof(struct acpi_battery, power_unit), 0}, 406 {offsetof(struct acpi_battery, design_capacity), 0}, 407 {offsetof(struct acpi_battery, full_charge_capacity), 0}, 408 {offsetof(struct acpi_battery, technology), 0}, 409 {offsetof(struct acpi_battery, design_voltage), 0}, 410 {offsetof(struct acpi_battery, design_capacity_warning), 0}, 411 {offsetof(struct acpi_battery, design_capacity_low), 0}, 412 {offsetof(struct acpi_battery, cycle_count), 0}, 413 {offsetof(struct acpi_battery, measurement_accuracy), 0}, 414 {offsetof(struct acpi_battery, max_sampling_time), 0}, 415 {offsetof(struct acpi_battery, min_sampling_time), 0}, 416 {offsetof(struct acpi_battery, max_averaging_interval), 0}, 417 {offsetof(struct acpi_battery, min_averaging_interval), 0}, 418 {offsetof(struct acpi_battery, capacity_granularity_1), 0}, 419 {offsetof(struct acpi_battery, capacity_granularity_2), 0}, 420 {offsetof(struct acpi_battery, model_number), 1}, 421 {offsetof(struct acpi_battery, serial_number), 1}, 422 {offsetof(struct acpi_battery, type), 1}, 423 {offsetof(struct acpi_battery, oem_info), 1}, 424 }; 425 426 static int extract_package(struct acpi_battery *battery, 427 union acpi_object *package, 428 const struct acpi_offsets *offsets, int num) 429 { 430 int i; 431 union acpi_object *element; 432 433 if (package->type != ACPI_TYPE_PACKAGE) 434 return -EFAULT; 435 for (i = 0; i < num; ++i) { 436 if (package->package.count <= i) 437 return -EFAULT; 438 element = &package->package.elements[i]; 439 if (offsets[i].mode) { 440 u8 *ptr = (u8 *)battery + offsets[i].offset; 441 u32 len = MAX_STRING_LENGTH; 442 443 switch (element->type) { 444 case ACPI_TYPE_BUFFER: 445 if (len > element->buffer.length + 1) 446 len = element->buffer.length + 1; 447 448 fallthrough; 449 case ACPI_TYPE_STRING: 450 strscpy(ptr, element->string.pointer, len); 451 452 break; 453 case ACPI_TYPE_INTEGER: 454 strscpy(ptr, (u8 *)&element->integer.value, sizeof(u64) + 1); 455 456 break; 457 default: 458 *ptr = 0; /* don't have value */ 459 } 460 } else { 461 int *x = (int *)((u8 *)battery + offsets[i].offset); 462 *x = (element->type == ACPI_TYPE_INTEGER) ? 463 element->integer.value : -1; 464 } 465 } 466 return 0; 467 } 468 469 static int acpi_battery_get_status(struct acpi_battery *battery) 470 { 471 if (acpi_bus_get_status(battery->device)) { 472 acpi_handle_info(battery->device->handle, 473 "_STA evaluation failed\n"); 474 return -ENODEV; 475 } 476 return 0; 477 } 478 479 480 static int extract_battery_info(const int use_bix, 481 struct acpi_battery *battery, 482 const struct acpi_buffer *buffer) 483 { 484 int result = -EFAULT; 485 486 if (use_bix && battery_bix_broken_package) 487 result = extract_package(battery, buffer->pointer, 488 extended_info_offsets + 1, 489 ARRAY_SIZE(extended_info_offsets) - 1); 490 else if (use_bix) 491 result = extract_package(battery, buffer->pointer, 492 extended_info_offsets, 493 ARRAY_SIZE(extended_info_offsets)); 494 else 495 result = extract_package(battery, buffer->pointer, 496 info_offsets, ARRAY_SIZE(info_offsets)); 497 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) 498 battery->full_charge_capacity = battery->design_capacity; 499 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) && 500 battery->power_unit && battery->design_voltage) { 501 battery->design_capacity = battery->design_capacity * 502 10000 / battery->design_voltage; 503 battery->full_charge_capacity = battery->full_charge_capacity * 504 10000 / battery->design_voltage; 505 battery->design_capacity_warning = 506 battery->design_capacity_warning * 507 10000 / battery->design_voltage; 508 /* Curiously, design_capacity_low, unlike the rest of them, 509 * is correct. 510 */ 511 /* capacity_granularity_* equal 1 on the systems tested, so 512 * it's impossible to tell if they would need an adjustment 513 * or not if their values were higher. 514 */ 515 } 516 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) && 517 battery->capacity_now > battery->full_charge_capacity) 518 battery->capacity_now = battery->full_charge_capacity; 519 520 return result; 521 } 522 523 static int acpi_battery_get_info(struct acpi_battery *battery) 524 { 525 const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags); 526 int use_bix; 527 int result = -ENODEV; 528 529 if (!acpi_battery_present(battery)) 530 return 0; 531 532 533 for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) { 534 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 535 acpi_status status = AE_ERROR; 536 537 status = acpi_evaluate_object(battery->device->handle, 538 use_bix ? "_BIX":"_BIF", 539 NULL, &buffer); 540 541 if (ACPI_FAILURE(status)) { 542 acpi_handle_info(battery->device->handle, 543 "%s evaluation failed: %s\n", 544 use_bix ? "_BIX":"_BIF", 545 acpi_format_exception(status)); 546 } else { 547 result = extract_battery_info(use_bix, 548 battery, 549 &buffer); 550 551 kfree(buffer.pointer); 552 break; 553 } 554 } 555 556 if (!result && !use_bix && xinfo) 557 pr_warn(FW_BUG "The _BIX method is broken, using _BIF.\n"); 558 559 return result; 560 } 561 562 static int acpi_battery_get_state(struct acpi_battery *battery) 563 { 564 int result = 0; 565 acpi_status status = 0; 566 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 567 568 if (!acpi_battery_present(battery)) 569 return 0; 570 571 if (battery->update_time && 572 time_before(jiffies, battery->update_time + 573 msecs_to_jiffies(cache_time))) 574 return 0; 575 576 status = acpi_evaluate_object(battery->device->handle, "_BST", 577 NULL, &buffer); 578 if (ACPI_FAILURE(status)) { 579 acpi_handle_info(battery->device->handle, 580 "_BST evaluation failed: %s", 581 acpi_format_exception(status)); 582 return -ENODEV; 583 } 584 585 result = extract_package(battery, buffer.pointer, 586 state_offsets, ARRAY_SIZE(state_offsets)); 587 battery->update_time = jiffies; 588 kfree(buffer.pointer); 589 590 /* For buggy DSDTs that report negative 16-bit values for either 591 * charging or discharging current and/or report 0 as 65536 592 * due to bad math. 593 */ 594 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA && 595 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN && 596 (s16)(battery->rate_now) < 0) { 597 battery->rate_now = abs((s16)battery->rate_now); 598 pr_warn_once(FW_BUG "(dis)charge rate invalid.\n"); 599 } 600 601 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags) 602 && battery->capacity_now >= 0 && battery->capacity_now <= 100) 603 battery->capacity_now = (battery->capacity_now * 604 battery->full_charge_capacity) / 100; 605 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) && 606 battery->power_unit && battery->design_voltage) { 607 battery->capacity_now = battery->capacity_now * 608 10000 / battery->design_voltage; 609 } 610 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) && 611 battery->capacity_now > battery->full_charge_capacity) 612 battery->capacity_now = battery->full_charge_capacity; 613 614 return result; 615 } 616 617 static int acpi_battery_set_alarm(struct acpi_battery *battery) 618 { 619 acpi_status status = 0; 620 621 if (!acpi_battery_present(battery) || 622 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags)) 623 return -ENODEV; 624 625 status = acpi_execute_simple_method(battery->device->handle, "_BTP", 626 battery->alarm); 627 if (ACPI_FAILURE(status)) 628 return -ENODEV; 629 630 acpi_handle_debug(battery->device->handle, "Alarm set to %d\n", 631 battery->alarm); 632 633 return 0; 634 } 635 636 static int acpi_battery_init_alarm(struct acpi_battery *battery) 637 { 638 /* See if alarms are supported, and if so, set default */ 639 if (!acpi_has_method(battery->device->handle, "_BTP")) { 640 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags); 641 return 0; 642 } 643 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags); 644 if (!battery->alarm) 645 battery->alarm = battery->design_capacity_warning; 646 return acpi_battery_set_alarm(battery); 647 } 648 649 static ssize_t acpi_battery_alarm_show(struct device *dev, 650 struct device_attribute *attr, 651 char *buf) 652 { 653 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 654 655 return sysfs_emit(buf, "%d\n", battery->alarm * 1000); 656 } 657 658 static ssize_t acpi_battery_alarm_store(struct device *dev, 659 struct device_attribute *attr, 660 const char *buf, size_t count) 661 { 662 unsigned long x; 663 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 664 665 if (sscanf(buf, "%lu\n", &x) == 1) 666 battery->alarm = x/1000; 667 if (acpi_battery_present(battery)) 668 acpi_battery_set_alarm(battery); 669 return count; 670 } 671 672 static struct device_attribute alarm_attr = { 673 .attr = {.name = "alarm", .mode = 0644}, 674 .show = acpi_battery_alarm_show, 675 .store = acpi_battery_alarm_store, 676 }; 677 678 static struct attribute *acpi_battery_attrs[] = { 679 &alarm_attr.attr, 680 NULL 681 }; 682 ATTRIBUTE_GROUPS(acpi_battery); 683 684 /* 685 * The Battery Hooking API 686 * 687 * This API is used inside other drivers that need to expose 688 * platform-specific behaviour within the generic driver in a 689 * generic way. 690 * 691 */ 692 693 static LIST_HEAD(acpi_battery_list); 694 static LIST_HEAD(battery_hook_list); 695 static DEFINE_MUTEX(hook_mutex); 696 697 static void battery_hook_unregister_unlocked(struct acpi_battery_hook *hook) 698 { 699 struct acpi_battery *battery; 700 701 /* 702 * In order to remove a hook, we first need to 703 * de-register all the batteries that are registered. 704 */ 705 list_for_each_entry(battery, &acpi_battery_list, list) { 706 if (!hook->remove_battery(battery->bat, hook)) 707 power_supply_changed(battery->bat); 708 } 709 list_del_init(&hook->list); 710 711 pr_info("hook unregistered: %s\n", hook->name); 712 } 713 714 void battery_hook_unregister(struct acpi_battery_hook *hook) 715 { 716 mutex_lock(&hook_mutex); 717 /* 718 * Ignore already unregistered battery hooks. This might happen 719 * if a battery hook was previously unloaded due to an error when 720 * adding a new battery. 721 */ 722 if (!list_empty(&hook->list)) 723 battery_hook_unregister_unlocked(hook); 724 725 mutex_unlock(&hook_mutex); 726 } 727 EXPORT_SYMBOL_GPL(battery_hook_unregister); 728 729 void battery_hook_register(struct acpi_battery_hook *hook) 730 { 731 struct acpi_battery *battery; 732 733 mutex_lock(&hook_mutex); 734 list_add(&hook->list, &battery_hook_list); 735 /* 736 * Now that the driver is registered, we need 737 * to notify the hook that a battery is available 738 * for each battery, so that the driver may add 739 * its attributes. 740 */ 741 list_for_each_entry(battery, &acpi_battery_list, list) { 742 if (hook->add_battery(battery->bat, hook)) { 743 /* 744 * If a add-battery returns non-zero, 745 * the registration of the hook has failed, 746 * and we will not add it to the list of loaded 747 * hooks. 748 */ 749 pr_err("hook failed to load: %s", hook->name); 750 battery_hook_unregister_unlocked(hook); 751 goto end; 752 } 753 754 power_supply_changed(battery->bat); 755 } 756 pr_info("new hook: %s\n", hook->name); 757 end: 758 mutex_unlock(&hook_mutex); 759 } 760 EXPORT_SYMBOL_GPL(battery_hook_register); 761 762 static void devm_battery_hook_unregister(void *data) 763 { 764 struct acpi_battery_hook *hook = data; 765 766 battery_hook_unregister(hook); 767 } 768 769 int devm_battery_hook_register(struct device *dev, struct acpi_battery_hook *hook) 770 { 771 battery_hook_register(hook); 772 773 return devm_add_action_or_reset(dev, devm_battery_hook_unregister, hook); 774 } 775 EXPORT_SYMBOL_GPL(devm_battery_hook_register); 776 777 /* 778 * This function gets called right after the battery sysfs 779 * attributes have been added, so that the drivers that 780 * define custom sysfs attributes can add their own. 781 */ 782 static void battery_hook_add_battery(struct acpi_battery *battery) 783 { 784 struct acpi_battery_hook *hook_node, *tmp; 785 786 mutex_lock(&hook_mutex); 787 INIT_LIST_HEAD(&battery->list); 788 list_add(&battery->list, &acpi_battery_list); 789 /* 790 * Since we added a new battery to the list, we need to 791 * iterate over the hooks and call add_battery for each 792 * hook that was registered. This usually happens 793 * when a battery gets hotplugged or initialized 794 * during the battery module initialization. 795 */ 796 list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) { 797 if (hook_node->add_battery(battery->bat, hook_node)) { 798 /* 799 * The notification of the hook has failed, to 800 * prevent further errors we will unload the hook. 801 */ 802 pr_err("error in hook, unloading: %s", 803 hook_node->name); 804 battery_hook_unregister_unlocked(hook_node); 805 } 806 } 807 mutex_unlock(&hook_mutex); 808 } 809 810 static void battery_hook_remove_battery(struct acpi_battery *battery) 811 { 812 struct acpi_battery_hook *hook; 813 814 mutex_lock(&hook_mutex); 815 /* 816 * Before removing the hook, we need to remove all 817 * custom attributes from the battery. 818 */ 819 list_for_each_entry(hook, &battery_hook_list, list) { 820 hook->remove_battery(battery->bat, hook); 821 } 822 /* Then, just remove the battery from the list */ 823 list_del(&battery->list); 824 mutex_unlock(&hook_mutex); 825 } 826 827 static void __exit battery_hook_exit(void) 828 { 829 struct acpi_battery_hook *hook; 830 struct acpi_battery_hook *ptr; 831 /* 832 * At this point, the acpi_bus_unregister_driver() 833 * has called remove for all batteries. We just 834 * need to remove the hooks. 835 */ 836 list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) { 837 battery_hook_unregister(hook); 838 } 839 mutex_destroy(&hook_mutex); 840 } 841 842 static int sysfs_add_battery(struct acpi_battery *battery) 843 { 844 struct power_supply_config psy_cfg = { 845 .drv_data = battery, 846 .attr_grp = acpi_battery_groups, 847 .no_wakeup_source = true, 848 }; 849 bool full_cap_broken = false; 850 851 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) && 852 !ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) 853 full_cap_broken = true; 854 855 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) { 856 if (full_cap_broken) { 857 battery->bat_desc.properties = 858 charge_battery_full_cap_broken_props; 859 battery->bat_desc.num_properties = 860 ARRAY_SIZE(charge_battery_full_cap_broken_props); 861 } else { 862 battery->bat_desc.properties = charge_battery_props; 863 battery->bat_desc.num_properties = 864 ARRAY_SIZE(charge_battery_props); 865 } 866 } else { 867 if (full_cap_broken) { 868 battery->bat_desc.properties = 869 energy_battery_full_cap_broken_props; 870 battery->bat_desc.num_properties = 871 ARRAY_SIZE(energy_battery_full_cap_broken_props); 872 } else { 873 battery->bat_desc.properties = energy_battery_props; 874 battery->bat_desc.num_properties = 875 ARRAY_SIZE(energy_battery_props); 876 } 877 } 878 879 battery->bat_desc.name = acpi_device_bid(battery->device); 880 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY; 881 battery->bat_desc.get_property = acpi_battery_get_property; 882 883 battery->bat = power_supply_register(&battery->device->dev, 884 &battery->bat_desc, &psy_cfg); 885 886 if (IS_ERR(battery->bat)) { 887 int result = PTR_ERR(battery->bat); 888 889 battery->bat = NULL; 890 return result; 891 } 892 battery_hook_add_battery(battery); 893 return 0; 894 } 895 896 static void sysfs_remove_battery(struct acpi_battery *battery) 897 { 898 if (!battery->bat) 899 return; 900 901 battery_hook_remove_battery(battery); 902 power_supply_unregister(battery->bat); 903 battery->bat = NULL; 904 } 905 906 static void find_battery(const struct dmi_header *dm, void *private) 907 { 908 struct acpi_battery *battery = (struct acpi_battery *)private; 909 /* Note: the hardcoded offsets below have been extracted from 910 * the source code of dmidecode. 911 */ 912 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) { 913 const u8 *dmi_data = (const u8 *)(dm + 1); 914 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6)); 915 916 if (dm->length >= 18) 917 dmi_capacity *= dmi_data[17]; 918 if (battery->design_capacity * battery->design_voltage / 1000 919 != dmi_capacity && 920 battery->design_capacity * 10 == dmi_capacity) 921 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, 922 &battery->flags); 923 } 924 } 925 926 /* 927 * According to the ACPI spec, some kinds of primary batteries can 928 * report percentage battery remaining capacity directly to OS. 929 * In this case, it reports the Last Full Charged Capacity == 100 930 * and BatteryPresentRate == 0xFFFFFFFF. 931 * 932 * Now we found some battery reports percentage remaining capacity 933 * even if it's rechargeable. 934 * https://bugzilla.kernel.org/show_bug.cgi?id=15979 935 * 936 * Handle this correctly so that they won't break userspace. 937 */ 938 static void acpi_battery_quirks(struct acpi_battery *battery) 939 { 940 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) 941 return; 942 943 if (battery->full_charge_capacity == 100 && 944 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN && 945 battery->capacity_now >= 0 && battery->capacity_now <= 100) { 946 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags); 947 battery->full_charge_capacity = battery->design_capacity; 948 battery->capacity_now = (battery->capacity_now * 949 battery->full_charge_capacity) / 100; 950 } 951 952 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags)) 953 return; 954 955 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) { 956 const char *s; 957 958 s = dmi_get_system_info(DMI_PRODUCT_VERSION); 959 if (s && !strncasecmp(s, "ThinkPad", 8)) { 960 dmi_walk(find_battery, battery); 961 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, 962 &battery->flags) && 963 battery->design_voltage) { 964 battery->design_capacity = 965 battery->design_capacity * 966 10000 / battery->design_voltage; 967 battery->full_charge_capacity = 968 battery->full_charge_capacity * 969 10000 / battery->design_voltage; 970 battery->design_capacity_warning = 971 battery->design_capacity_warning * 972 10000 / battery->design_voltage; 973 battery->capacity_now = battery->capacity_now * 974 10000 / battery->design_voltage; 975 } 976 } 977 } 978 979 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags)) 980 return; 981 982 if (acpi_battery_is_degraded(battery) && 983 battery->capacity_now > battery->full_charge_capacity) { 984 set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags); 985 battery->capacity_now = battery->full_charge_capacity; 986 } 987 } 988 989 static int acpi_battery_update(struct acpi_battery *battery, bool resume) 990 { 991 int result = acpi_battery_get_status(battery); 992 993 if (result) 994 return result; 995 996 if (!acpi_battery_present(battery)) { 997 sysfs_remove_battery(battery); 998 battery->update_time = 0; 999 return 0; 1000 } 1001 1002 if (resume) 1003 return 0; 1004 1005 if (!battery->update_time) { 1006 result = acpi_battery_get_info(battery); 1007 if (result) 1008 return result; 1009 acpi_battery_init_alarm(battery); 1010 } 1011 1012 result = acpi_battery_get_state(battery); 1013 if (result) 1014 return result; 1015 acpi_battery_quirks(battery); 1016 1017 if (!battery->bat) { 1018 result = sysfs_add_battery(battery); 1019 if (result) 1020 return result; 1021 } 1022 1023 /* 1024 * Wakeup the system if battery is critical low 1025 * or lower than the alarm level 1026 */ 1027 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) || 1028 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) && 1029 (battery->capacity_now <= battery->alarm))) 1030 acpi_pm_wakeup_event(&battery->device->dev); 1031 1032 return result; 1033 } 1034 1035 static void acpi_battery_refresh(struct acpi_battery *battery) 1036 { 1037 int power_unit; 1038 1039 if (!battery->bat) 1040 return; 1041 1042 power_unit = battery->power_unit; 1043 1044 acpi_battery_get_info(battery); 1045 1046 if (power_unit == battery->power_unit) 1047 return; 1048 1049 /* The battery has changed its reporting units. */ 1050 sysfs_remove_battery(battery); 1051 sysfs_add_battery(battery); 1052 } 1053 1054 /* Driver Interface */ 1055 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data) 1056 { 1057 struct acpi_device *device = data; 1058 struct acpi_battery *battery = acpi_driver_data(device); 1059 struct power_supply *old; 1060 1061 if (!battery) 1062 return; 1063 1064 guard(mutex)(&battery->update_lock); 1065 1066 old = battery->bat; 1067 /* 1068 * On Acer Aspire V5-573G notifications are sometimes triggered too 1069 * early. For example, when AC is unplugged and notification is 1070 * triggered, battery state is still reported as "Full", and changes to 1071 * "Discharging" only after short delay, without any notification. 1072 */ 1073 if (battery_notification_delay_ms > 0) 1074 msleep(battery_notification_delay_ms); 1075 if (event == ACPI_BATTERY_NOTIFY_INFO) 1076 acpi_battery_refresh(battery); 1077 acpi_battery_update(battery, false); 1078 acpi_bus_generate_netlink_event(device->pnp.device_class, 1079 dev_name(&device->dev), event, 1080 acpi_battery_present(battery)); 1081 acpi_notifier_call_chain(device, event, acpi_battery_present(battery)); 1082 /* acpi_battery_update could remove power_supply object */ 1083 if (old && battery->bat) 1084 power_supply_changed(battery->bat); 1085 } 1086 1087 static int battery_notify(struct notifier_block *nb, 1088 unsigned long mode, void *_unused) 1089 { 1090 struct acpi_battery *battery = container_of(nb, struct acpi_battery, 1091 pm_nb); 1092 1093 if (mode == PM_POST_SUSPEND || mode == PM_POST_HIBERNATION) { 1094 guard(mutex)(&battery->update_lock); 1095 1096 if (!acpi_battery_present(battery)) 1097 return 0; 1098 1099 if (battery->bat) { 1100 acpi_battery_refresh(battery); 1101 } else { 1102 int result; 1103 1104 result = acpi_battery_get_info(battery); 1105 if (result) 1106 return result; 1107 1108 result = sysfs_add_battery(battery); 1109 if (result) 1110 return result; 1111 } 1112 1113 acpi_battery_init_alarm(battery); 1114 acpi_battery_get_state(battery); 1115 } 1116 1117 return 0; 1118 } 1119 1120 static int __init 1121 battery_bix_broken_package_quirk(const struct dmi_system_id *d) 1122 { 1123 battery_bix_broken_package = 1; 1124 return 0; 1125 } 1126 1127 static int __init 1128 battery_notification_delay_quirk(const struct dmi_system_id *d) 1129 { 1130 battery_notification_delay_ms = 1000; 1131 return 0; 1132 } 1133 1134 static int __init 1135 battery_ac_is_broken_quirk(const struct dmi_system_id *d) 1136 { 1137 battery_ac_is_broken = 1; 1138 return 0; 1139 } 1140 1141 static const struct dmi_system_id bat_dmi_table[] __initconst = { 1142 { 1143 /* NEC LZ750/LS */ 1144 .callback = battery_bix_broken_package_quirk, 1145 .matches = { 1146 DMI_MATCH(DMI_SYS_VENDOR, "NEC"), 1147 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"), 1148 }, 1149 }, 1150 { 1151 /* Acer Aspire V5-573G */ 1152 .callback = battery_notification_delay_quirk, 1153 .matches = { 1154 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 1155 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"), 1156 }, 1157 }, 1158 { 1159 /* Point of View mobii wintab p800w */ 1160 .callback = battery_ac_is_broken_quirk, 1161 .matches = { 1162 DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"), 1163 DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"), 1164 DMI_MATCH(DMI_BIOS_VERSION, "3BAIR1013"), 1165 /* Above matches are too generic, add bios-date match */ 1166 DMI_MATCH(DMI_BIOS_DATE, "08/22/2014"), 1167 }, 1168 }, 1169 { 1170 /* Microsoft Surface Go 3 */ 1171 .callback = battery_notification_delay_quirk, 1172 .matches = { 1173 DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), 1174 DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go 3"), 1175 }, 1176 }, 1177 {}, 1178 }; 1179 1180 /* 1181 * Some machines'(E,G Lenovo Z480) ECs are not stable 1182 * during boot up and this causes battery driver fails to be 1183 * probed due to failure of getting battery information 1184 * from EC sometimes. After several retries, the operation 1185 * may work. So add retry code here and 20ms sleep between 1186 * every retries. 1187 */ 1188 static int acpi_battery_update_retry(struct acpi_battery *battery) 1189 { 1190 int retry, ret; 1191 1192 guard(mutex)(&battery->update_lock); 1193 1194 for (retry = 5; retry; retry--) { 1195 ret = acpi_battery_update(battery, false); 1196 if (!ret) 1197 break; 1198 1199 msleep(20); 1200 } 1201 return ret; 1202 } 1203 1204 static void sysfs_battery_cleanup(struct acpi_battery *battery) 1205 { 1206 guard(mutex)(&battery->update_lock); 1207 1208 sysfs_remove_battery(battery); 1209 } 1210 1211 static int acpi_battery_add(struct acpi_device *device) 1212 { 1213 int result = 0; 1214 struct acpi_battery *battery; 1215 1216 if (!device) 1217 return -EINVAL; 1218 1219 if (device->dep_unmet) 1220 return -EPROBE_DEFER; 1221 1222 battery = devm_kzalloc(&device->dev, sizeof(*battery), GFP_KERNEL); 1223 if (!battery) 1224 return -ENOMEM; 1225 battery->device = device; 1226 strscpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME); 1227 strscpy(acpi_device_class(device), ACPI_BATTERY_CLASS); 1228 device->driver_data = battery; 1229 1230 result = devm_mutex_init(&device->dev, &battery->update_lock); 1231 if (result) 1232 return result; 1233 1234 if (acpi_has_method(battery->device->handle, "_BIX")) 1235 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags); 1236 1237 result = acpi_battery_update_retry(battery); 1238 if (result) 1239 goto fail; 1240 1241 pr_info("Slot [%s] (battery %s)\n", acpi_device_bid(device), 1242 device->status.battery_present ? "present" : "absent"); 1243 1244 battery->pm_nb.notifier_call = battery_notify; 1245 result = register_pm_notifier(&battery->pm_nb); 1246 if (result) 1247 goto fail; 1248 1249 device_init_wakeup(&device->dev, 1); 1250 1251 result = acpi_dev_install_notify_handler(device, ACPI_ALL_NOTIFY, 1252 acpi_battery_notify, device); 1253 if (result) 1254 goto fail_pm; 1255 1256 return 0; 1257 1258 fail_pm: 1259 device_init_wakeup(&device->dev, 0); 1260 unregister_pm_notifier(&battery->pm_nb); 1261 fail: 1262 sysfs_battery_cleanup(battery); 1263 1264 return result; 1265 } 1266 1267 static void acpi_battery_remove(struct acpi_device *device) 1268 { 1269 struct acpi_battery *battery; 1270 1271 if (!device || !acpi_driver_data(device)) 1272 return; 1273 1274 battery = acpi_driver_data(device); 1275 1276 acpi_dev_remove_notify_handler(device, ACPI_ALL_NOTIFY, 1277 acpi_battery_notify); 1278 1279 device_init_wakeup(&device->dev, 0); 1280 unregister_pm_notifier(&battery->pm_nb); 1281 1282 guard(mutex)(&battery->update_lock); 1283 1284 sysfs_remove_battery(battery); 1285 } 1286 1287 /* this is needed to learn about changes made in suspended state */ 1288 static int acpi_battery_resume(struct device *dev) 1289 { 1290 struct acpi_battery *battery; 1291 1292 if (!dev) 1293 return -EINVAL; 1294 1295 battery = acpi_driver_data(to_acpi_device(dev)); 1296 if (!battery) 1297 return -EINVAL; 1298 1299 battery->update_time = 0; 1300 1301 guard(mutex)(&battery->update_lock); 1302 1303 acpi_battery_update(battery, true); 1304 return 0; 1305 } 1306 1307 static DEFINE_SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume); 1308 1309 static struct acpi_driver acpi_battery_driver = { 1310 .name = "battery", 1311 .class = ACPI_BATTERY_CLASS, 1312 .ids = battery_device_ids, 1313 .ops = { 1314 .add = acpi_battery_add, 1315 .remove = acpi_battery_remove, 1316 }, 1317 .drv.pm = pm_sleep_ptr(&acpi_battery_pm), 1318 .drv.probe_type = PROBE_PREFER_ASYNCHRONOUS, 1319 }; 1320 1321 static int __init acpi_battery_init(void) 1322 { 1323 if (acpi_disabled || acpi_quirk_skip_acpi_ac_and_battery()) 1324 return -ENODEV; 1325 1326 dmi_check_system(bat_dmi_table); 1327 1328 return acpi_bus_register_driver(&acpi_battery_driver); 1329 } 1330 1331 static void __exit acpi_battery_exit(void) 1332 { 1333 acpi_bus_unregister_driver(&acpi_battery_driver); 1334 battery_hook_exit(); 1335 } 1336 1337 module_init(acpi_battery_init); 1338 module_exit(acpi_battery_exit); 1339