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 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[MAX_STRING_LENGTH]; 122 char serial_number[MAX_STRING_LENGTH]; 123 char type[MAX_STRING_LENGTH]; 124 char oem_info[MAX_STRING_LENGTH]; 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, critical low or charge limited */ 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 (battery->state & ACPI_BATTERY_STATE_CHARGE_LIMITING) 217 val->intval = POWER_SUPPLY_STATUS_NOT_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 } 310 311 static const 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 }; 328 329 static const 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 }; 342 343 static const 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 }; 360 361 static const 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 */ 376 struct acpi_offsets { 377 size_t offset; /* offset inside struct acpi_sbs_battery */ 378 u8 mode; /* int or string? */ 379 }; 380 381 static 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 }; 387 388 static 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 }; 403 404 static 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 }; 426 427 static 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 } 469 470 static 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 } 479 480 481 static 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 } 523 524 static 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 } 564 565 static 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 } 622 623 static 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 } 644 645 static 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 } 657 658 static 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 sysfs_emit(buf, "%d\n", battery->alarm * 1000); 665 } 666 667 static 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 } 680 681 static 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 static struct attribute *acpi_battery_attrs[] = { 688 &alarm_attr.attr, 689 NULL 690 }; 691 ATTRIBUTE_GROUPS(acpi_battery); 692 693 /* 694 * The Battery Hooking API 695 * 696 * This API is used inside other drivers that need to expose 697 * platform-specific behaviour within the generic driver in a 698 * generic way. 699 * 700 */ 701 702 static LIST_HEAD(acpi_battery_list); 703 static LIST_HEAD(battery_hook_list); 704 static DEFINE_MUTEX(hook_mutex); 705 706 static void battery_hook_unregister_unlocked(struct acpi_battery_hook *hook) 707 { 708 struct acpi_battery *battery; 709 710 /* 711 * In order to remove a hook, we first need to 712 * de-register all the batteries that are registered. 713 */ 714 list_for_each_entry(battery, &acpi_battery_list, list) { 715 if (!hook->remove_battery(battery->bat, hook)) 716 power_supply_changed(battery->bat); 717 } 718 list_del_init(&hook->list); 719 720 pr_info("extension unregistered: %s\n", hook->name); 721 } 722 723 void battery_hook_unregister(struct acpi_battery_hook *hook) 724 { 725 mutex_lock(&hook_mutex); 726 /* 727 * Ignore already unregistered battery hooks. This might happen 728 * if a battery hook was previously unloaded due to an error when 729 * adding a new battery. 730 */ 731 if (!list_empty(&hook->list)) 732 battery_hook_unregister_unlocked(hook); 733 734 mutex_unlock(&hook_mutex); 735 } 736 EXPORT_SYMBOL_GPL(battery_hook_unregister); 737 738 void battery_hook_register(struct acpi_battery_hook *hook) 739 { 740 struct acpi_battery *battery; 741 742 mutex_lock(&hook_mutex); 743 list_add(&hook->list, &battery_hook_list); 744 /* 745 * Now that the driver is registered, we need 746 * to notify the hook that a battery is available 747 * for each battery, so that the driver may add 748 * its attributes. 749 */ 750 list_for_each_entry(battery, &acpi_battery_list, list) { 751 if (hook->add_battery(battery->bat, hook)) { 752 /* 753 * If a add-battery returns non-zero, 754 * the registration of the extension has failed, 755 * and we will not add it to the list of loaded 756 * hooks. 757 */ 758 pr_err("extension failed to load: %s", hook->name); 759 battery_hook_unregister_unlocked(hook); 760 goto end; 761 } 762 763 power_supply_changed(battery->bat); 764 } 765 pr_info("new extension: %s\n", hook->name); 766 end: 767 mutex_unlock(&hook_mutex); 768 } 769 EXPORT_SYMBOL_GPL(battery_hook_register); 770 771 static void devm_battery_hook_unregister(void *data) 772 { 773 struct acpi_battery_hook *hook = data; 774 775 battery_hook_unregister(hook); 776 } 777 778 int devm_battery_hook_register(struct device *dev, struct acpi_battery_hook *hook) 779 { 780 battery_hook_register(hook); 781 782 return devm_add_action_or_reset(dev, devm_battery_hook_unregister, hook); 783 } 784 EXPORT_SYMBOL_GPL(devm_battery_hook_register); 785 786 /* 787 * This function gets called right after the battery sysfs 788 * attributes have been added, so that the drivers that 789 * define custom sysfs attributes can add their own. 790 */ 791 static void battery_hook_add_battery(struct acpi_battery *battery) 792 { 793 struct acpi_battery_hook *hook_node, *tmp; 794 795 mutex_lock(&hook_mutex); 796 INIT_LIST_HEAD(&battery->list); 797 list_add(&battery->list, &acpi_battery_list); 798 /* 799 * Since we added a new battery to the list, we need to 800 * iterate over the hooks and call add_battery for each 801 * hook that was registered. This usually happens 802 * when a battery gets hotplugged or initialized 803 * during the battery module initialization. 804 */ 805 list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) { 806 if (hook_node->add_battery(battery->bat, hook_node)) { 807 /* 808 * The notification of the extensions has failed, to 809 * prevent further errors we will unload the extension. 810 */ 811 pr_err("error in extension, unloading: %s", 812 hook_node->name); 813 battery_hook_unregister_unlocked(hook_node); 814 } 815 } 816 mutex_unlock(&hook_mutex); 817 } 818 819 static void battery_hook_remove_battery(struct acpi_battery *battery) 820 { 821 struct acpi_battery_hook *hook; 822 823 mutex_lock(&hook_mutex); 824 /* 825 * Before removing the hook, we need to remove all 826 * custom attributes from the battery. 827 */ 828 list_for_each_entry(hook, &battery_hook_list, list) { 829 hook->remove_battery(battery->bat, hook); 830 } 831 /* Then, just remove the battery from the list */ 832 list_del(&battery->list); 833 mutex_unlock(&hook_mutex); 834 } 835 836 static void __exit battery_hook_exit(void) 837 { 838 struct acpi_battery_hook *hook; 839 struct acpi_battery_hook *ptr; 840 /* 841 * At this point, the acpi_bus_unregister_driver() 842 * has called remove for all batteries. We just 843 * need to remove the hooks. 844 */ 845 list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) { 846 battery_hook_unregister(hook); 847 } 848 mutex_destroy(&hook_mutex); 849 } 850 851 static int sysfs_add_battery(struct acpi_battery *battery) 852 { 853 struct power_supply_config psy_cfg = { 854 .drv_data = battery, 855 .attr_grp = acpi_battery_groups, 856 }; 857 bool full_cap_broken = false; 858 859 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) && 860 !ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) 861 full_cap_broken = true; 862 863 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) { 864 if (full_cap_broken) { 865 battery->bat_desc.properties = 866 charge_battery_full_cap_broken_props; 867 battery->bat_desc.num_properties = 868 ARRAY_SIZE(charge_battery_full_cap_broken_props); 869 } else { 870 battery->bat_desc.properties = charge_battery_props; 871 battery->bat_desc.num_properties = 872 ARRAY_SIZE(charge_battery_props); 873 } 874 } else { 875 if (full_cap_broken) { 876 battery->bat_desc.properties = 877 energy_battery_full_cap_broken_props; 878 battery->bat_desc.num_properties = 879 ARRAY_SIZE(energy_battery_full_cap_broken_props); 880 } else { 881 battery->bat_desc.properties = energy_battery_props; 882 battery->bat_desc.num_properties = 883 ARRAY_SIZE(energy_battery_props); 884 } 885 } 886 887 battery->bat_desc.name = acpi_device_bid(battery->device); 888 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY; 889 battery->bat_desc.get_property = acpi_battery_get_property; 890 891 battery->bat = power_supply_register_no_ws(&battery->device->dev, 892 &battery->bat_desc, &psy_cfg); 893 894 if (IS_ERR(battery->bat)) { 895 int result = PTR_ERR(battery->bat); 896 897 battery->bat = NULL; 898 return result; 899 } 900 battery_hook_add_battery(battery); 901 return 0; 902 } 903 904 static void sysfs_remove_battery(struct acpi_battery *battery) 905 { 906 mutex_lock(&battery->sysfs_lock); 907 if (!battery->bat) { 908 mutex_unlock(&battery->sysfs_lock); 909 return; 910 } 911 battery_hook_remove_battery(battery); 912 power_supply_unregister(battery->bat); 913 battery->bat = NULL; 914 mutex_unlock(&battery->sysfs_lock); 915 } 916 917 static void find_battery(const struct dmi_header *dm, void *private) 918 { 919 struct acpi_battery *battery = (struct acpi_battery *)private; 920 /* Note: the hardcoded offsets below have been extracted from 921 * the source code of dmidecode. 922 */ 923 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) { 924 const u8 *dmi_data = (const u8 *)(dm + 1); 925 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6)); 926 927 if (dm->length >= 18) 928 dmi_capacity *= dmi_data[17]; 929 if (battery->design_capacity * battery->design_voltage / 1000 930 != dmi_capacity && 931 battery->design_capacity * 10 == dmi_capacity) 932 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, 933 &battery->flags); 934 } 935 } 936 937 /* 938 * According to the ACPI spec, some kinds of primary batteries can 939 * report percentage battery remaining capacity directly to OS. 940 * In this case, it reports the Last Full Charged Capacity == 100 941 * and BatteryPresentRate == 0xFFFFFFFF. 942 * 943 * Now we found some battery reports percentage remaining capacity 944 * even if it's rechargeable. 945 * https://bugzilla.kernel.org/show_bug.cgi?id=15979 946 * 947 * Handle this correctly so that they won't break userspace. 948 */ 949 static void acpi_battery_quirks(struct acpi_battery *battery) 950 { 951 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) 952 return; 953 954 if (battery->full_charge_capacity == 100 && 955 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN && 956 battery->capacity_now >= 0 && battery->capacity_now <= 100) { 957 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags); 958 battery->full_charge_capacity = battery->design_capacity; 959 battery->capacity_now = (battery->capacity_now * 960 battery->full_charge_capacity) / 100; 961 } 962 963 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags)) 964 return; 965 966 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) { 967 const char *s; 968 969 s = dmi_get_system_info(DMI_PRODUCT_VERSION); 970 if (s && !strncasecmp(s, "ThinkPad", 8)) { 971 dmi_walk(find_battery, battery); 972 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, 973 &battery->flags) && 974 battery->design_voltage) { 975 battery->design_capacity = 976 battery->design_capacity * 977 10000 / battery->design_voltage; 978 battery->full_charge_capacity = 979 battery->full_charge_capacity * 980 10000 / battery->design_voltage; 981 battery->design_capacity_warning = 982 battery->design_capacity_warning * 983 10000 / battery->design_voltage; 984 battery->capacity_now = battery->capacity_now * 985 10000 / battery->design_voltage; 986 } 987 } 988 } 989 990 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags)) 991 return; 992 993 if (acpi_battery_is_degraded(battery) && 994 battery->capacity_now > battery->full_charge_capacity) { 995 set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags); 996 battery->capacity_now = battery->full_charge_capacity; 997 } 998 } 999 1000 static int acpi_battery_update(struct acpi_battery *battery, bool resume) 1001 { 1002 int result = acpi_battery_get_status(battery); 1003 1004 if (result) 1005 return result; 1006 1007 if (!acpi_battery_present(battery)) { 1008 sysfs_remove_battery(battery); 1009 battery->update_time = 0; 1010 return 0; 1011 } 1012 1013 if (resume) 1014 return 0; 1015 1016 if (!battery->update_time) { 1017 result = acpi_battery_get_info(battery); 1018 if (result) 1019 return result; 1020 acpi_battery_init_alarm(battery); 1021 } 1022 1023 result = acpi_battery_get_state(battery); 1024 if (result) 1025 return result; 1026 acpi_battery_quirks(battery); 1027 1028 if (!battery->bat) { 1029 result = sysfs_add_battery(battery); 1030 if (result) 1031 return result; 1032 } 1033 1034 /* 1035 * Wakeup the system if battery is critical low 1036 * or lower than the alarm level 1037 */ 1038 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) || 1039 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) && 1040 (battery->capacity_now <= battery->alarm))) 1041 acpi_pm_wakeup_event(&battery->device->dev); 1042 1043 return result; 1044 } 1045 1046 static void acpi_battery_refresh(struct acpi_battery *battery) 1047 { 1048 int power_unit; 1049 1050 if (!battery->bat) 1051 return; 1052 1053 power_unit = battery->power_unit; 1054 1055 acpi_battery_get_info(battery); 1056 1057 if (power_unit == battery->power_unit) 1058 return; 1059 1060 /* The battery has changed its reporting units. */ 1061 sysfs_remove_battery(battery); 1062 sysfs_add_battery(battery); 1063 } 1064 1065 /* Driver Interface */ 1066 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data) 1067 { 1068 struct acpi_device *device = data; 1069 struct acpi_battery *battery = acpi_driver_data(device); 1070 struct power_supply *old; 1071 1072 if (!battery) 1073 return; 1074 old = battery->bat; 1075 /* 1076 * On Acer Aspire V5-573G notifications are sometimes triggered too 1077 * early. For example, when AC is unplugged and notification is 1078 * triggered, battery state is still reported as "Full", and changes to 1079 * "Discharging" only after short delay, without any notification. 1080 */ 1081 if (battery_notification_delay_ms > 0) 1082 msleep(battery_notification_delay_ms); 1083 if (event == ACPI_BATTERY_NOTIFY_INFO) 1084 acpi_battery_refresh(battery); 1085 acpi_battery_update(battery, false); 1086 acpi_bus_generate_netlink_event(device->pnp.device_class, 1087 dev_name(&device->dev), event, 1088 acpi_battery_present(battery)); 1089 acpi_notifier_call_chain(device, event, acpi_battery_present(battery)); 1090 /* acpi_battery_update could remove power_supply object */ 1091 if (old && battery->bat) 1092 power_supply_changed(battery->bat); 1093 } 1094 1095 static int battery_notify(struct notifier_block *nb, 1096 unsigned long mode, void *_unused) 1097 { 1098 struct acpi_battery *battery = container_of(nb, struct acpi_battery, 1099 pm_nb); 1100 int result; 1101 1102 switch (mode) { 1103 case PM_POST_HIBERNATION: 1104 case PM_POST_SUSPEND: 1105 if (!acpi_battery_present(battery)) 1106 return 0; 1107 1108 if (battery->bat) { 1109 acpi_battery_refresh(battery); 1110 } else { 1111 result = acpi_battery_get_info(battery); 1112 if (result) 1113 return result; 1114 1115 result = sysfs_add_battery(battery); 1116 if (result) 1117 return result; 1118 } 1119 1120 acpi_battery_init_alarm(battery); 1121 acpi_battery_get_state(battery); 1122 break; 1123 } 1124 1125 return 0; 1126 } 1127 1128 static int __init 1129 battery_bix_broken_package_quirk(const struct dmi_system_id *d) 1130 { 1131 battery_bix_broken_package = 1; 1132 return 0; 1133 } 1134 1135 static int __init 1136 battery_notification_delay_quirk(const struct dmi_system_id *d) 1137 { 1138 battery_notification_delay_ms = 1000; 1139 return 0; 1140 } 1141 1142 static int __init 1143 battery_ac_is_broken_quirk(const struct dmi_system_id *d) 1144 { 1145 battery_ac_is_broken = 1; 1146 return 0; 1147 } 1148 1149 static const struct dmi_system_id bat_dmi_table[] __initconst = { 1150 { 1151 /* NEC LZ750/LS */ 1152 .callback = battery_bix_broken_package_quirk, 1153 .matches = { 1154 DMI_MATCH(DMI_SYS_VENDOR, "NEC"), 1155 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"), 1156 }, 1157 }, 1158 { 1159 /* Acer Aspire V5-573G */ 1160 .callback = battery_notification_delay_quirk, 1161 .matches = { 1162 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 1163 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"), 1164 }, 1165 }, 1166 { 1167 /* Point of View mobii wintab p800w */ 1168 .callback = battery_ac_is_broken_quirk, 1169 .matches = { 1170 DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"), 1171 DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"), 1172 DMI_MATCH(DMI_BIOS_VERSION, "3BAIR1013"), 1173 /* Above matches are too generic, add bios-date match */ 1174 DMI_MATCH(DMI_BIOS_DATE, "08/22/2014"), 1175 }, 1176 }, 1177 { 1178 /* Microsoft Surface Go 3 */ 1179 .callback = battery_notification_delay_quirk, 1180 .matches = { 1181 DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), 1182 DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go 3"), 1183 }, 1184 }, 1185 {}, 1186 }; 1187 1188 /* 1189 * Some machines'(E,G Lenovo Z480) ECs are not stable 1190 * during boot up and this causes battery driver fails to be 1191 * probed due to failure of getting battery information 1192 * from EC sometimes. After several retries, the operation 1193 * may work. So add retry code here and 20ms sleep between 1194 * every retries. 1195 */ 1196 static int acpi_battery_update_retry(struct acpi_battery *battery) 1197 { 1198 int retry, ret; 1199 1200 for (retry = 5; retry; retry--) { 1201 ret = acpi_battery_update(battery, false); 1202 if (!ret) 1203 break; 1204 1205 msleep(20); 1206 } 1207 return ret; 1208 } 1209 1210 static int acpi_battery_add(struct acpi_device *device) 1211 { 1212 int result = 0; 1213 struct acpi_battery *battery; 1214 1215 if (!device) 1216 return -EINVAL; 1217 1218 if (device->dep_unmet) 1219 return -EPROBE_DEFER; 1220 1221 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL); 1222 if (!battery) 1223 return -ENOMEM; 1224 battery->device = device; 1225 strscpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME); 1226 strscpy(acpi_device_class(device), ACPI_BATTERY_CLASS); 1227 device->driver_data = battery; 1228 mutex_init(&battery->lock); 1229 mutex_init(&battery->sysfs_lock); 1230 if (acpi_has_method(battery->device->handle, "_BIX")) 1231 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags); 1232 1233 result = acpi_battery_update_retry(battery); 1234 if (result) 1235 goto fail; 1236 1237 pr_info("Slot [%s] (battery %s)\n", acpi_device_bid(device), 1238 device->status.battery_present ? "present" : "absent"); 1239 1240 battery->pm_nb.notifier_call = battery_notify; 1241 register_pm_notifier(&battery->pm_nb); 1242 1243 device_init_wakeup(&device->dev, 1); 1244 1245 result = acpi_dev_install_notify_handler(device, ACPI_ALL_NOTIFY, 1246 acpi_battery_notify, device); 1247 if (result) 1248 goto fail_pm; 1249 1250 return 0; 1251 1252 fail_pm: 1253 device_init_wakeup(&device->dev, 0); 1254 unregister_pm_notifier(&battery->pm_nb); 1255 fail: 1256 sysfs_remove_battery(battery); 1257 mutex_destroy(&battery->lock); 1258 mutex_destroy(&battery->sysfs_lock); 1259 kfree(battery); 1260 1261 return result; 1262 } 1263 1264 static void acpi_battery_remove(struct acpi_device *device) 1265 { 1266 struct acpi_battery *battery; 1267 1268 if (!device || !acpi_driver_data(device)) 1269 return; 1270 1271 battery = acpi_driver_data(device); 1272 1273 acpi_dev_remove_notify_handler(device, ACPI_ALL_NOTIFY, 1274 acpi_battery_notify); 1275 1276 device_init_wakeup(&device->dev, 0); 1277 unregister_pm_notifier(&battery->pm_nb); 1278 sysfs_remove_battery(battery); 1279 1280 mutex_destroy(&battery->lock); 1281 mutex_destroy(&battery->sysfs_lock); 1282 kfree(battery); 1283 } 1284 1285 #ifdef CONFIG_PM_SLEEP 1286 /* this is needed to learn about changes made in suspended state */ 1287 static int acpi_battery_resume(struct device *dev) 1288 { 1289 struct acpi_battery *battery; 1290 1291 if (!dev) 1292 return -EINVAL; 1293 1294 battery = acpi_driver_data(to_acpi_device(dev)); 1295 if (!battery) 1296 return -EINVAL; 1297 1298 battery->update_time = 0; 1299 acpi_battery_update(battery, true); 1300 return 0; 1301 } 1302 #else 1303 #define acpi_battery_resume NULL 1304 #endif 1305 1306 static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume); 1307 1308 static struct acpi_driver acpi_battery_driver = { 1309 .name = "battery", 1310 .class = ACPI_BATTERY_CLASS, 1311 .ids = battery_device_ids, 1312 .ops = { 1313 .add = acpi_battery_add, 1314 .remove = acpi_battery_remove, 1315 }, 1316 .drv.pm = &acpi_battery_pm, 1317 .drv.probe_type = PROBE_PREFER_ASYNCHRONOUS, 1318 }; 1319 1320 static int __init acpi_battery_init(void) 1321 { 1322 if (acpi_disabled || acpi_quirk_skip_acpi_ac_and_battery()) 1323 return -ENODEV; 1324 1325 dmi_check_system(bat_dmi_table); 1326 1327 return acpi_bus_register_driver(&acpi_battery_driver); 1328 } 1329 1330 static void __exit acpi_battery_exit(void) 1331 { 1332 acpi_bus_unregister_driver(&acpi_battery_driver); 1333 battery_hook_exit(); 1334 } 1335 1336 module_init(acpi_battery_init); 1337 module_exit(acpi_battery_exit); 1338