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 int battery_quirk_notcharging; 56 static unsigned int cache_time = 1000; 57 module_param(cache_time, uint, 0644); 58 MODULE_PARM_DESC(cache_time, "cache time in milliseconds"); 59 60 static const struct acpi_device_id battery_device_ids[] = { 61 {"PNP0C0A", 0}, 62 63 /* Microsoft Surface Go 3 */ 64 {"MSHW0146", 0}, 65 66 {"", 0}, 67 }; 68 69 MODULE_DEVICE_TABLE(acpi, battery_device_ids); 70 71 enum { 72 ACPI_BATTERY_ALARM_PRESENT, 73 ACPI_BATTERY_XINFO_PRESENT, 74 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, 75 /* On Lenovo Thinkpad models from 2010 and 2011, the power unit 76 * switches between mWh and mAh depending on whether the system 77 * is running on battery or not. When mAh is the unit, most 78 * reported values are incorrect and need to be adjusted by 79 * 10000/design_voltage. Verified on x201, t410, t410s, and x220. 80 * Pre-2010 and 2012 models appear to always report in mWh and 81 * are thus unaffected (tested with t42, t61, t500, x200, x300, 82 * and x230). Also, in mid-2012 Lenovo issued a BIOS update for 83 * the 2011 models that fixes the issue (tested on x220 with a 84 * post-1.29 BIOS), but as of Nov. 2012, no such update is 85 * available for the 2010 models. 86 */ 87 ACPI_BATTERY_QUIRK_THINKPAD_MAH, 88 /* for batteries reporting current capacity with design capacity 89 * on a full charge, but showing degradation in full charge cap. 90 */ 91 ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, 92 }; 93 94 struct acpi_battery { 95 struct mutex lock; 96 struct mutex sysfs_lock; 97 struct power_supply *bat; 98 struct power_supply_desc bat_desc; 99 struct acpi_device *device; 100 struct notifier_block pm_nb; 101 struct list_head list; 102 unsigned long update_time; 103 int revision; 104 int rate_now; 105 int capacity_now; 106 int voltage_now; 107 int design_capacity; 108 int full_charge_capacity; 109 int technology; 110 int design_voltage; 111 int design_capacity_warning; 112 int design_capacity_low; 113 int cycle_count; 114 int measurement_accuracy; 115 int max_sampling_time; 116 int min_sampling_time; 117 int max_averaging_interval; 118 int min_averaging_interval; 119 int capacity_granularity_1; 120 int capacity_granularity_2; 121 int alarm; 122 char model_number[32]; 123 char serial_number[32]; 124 char type[32]; 125 char oem_info[32]; 126 int state; 127 int power_unit; 128 unsigned long flags; 129 }; 130 131 #define to_acpi_battery(x) power_supply_get_drvdata(x) 132 133 static inline int acpi_battery_present(struct acpi_battery *battery) 134 { 135 return battery->device->status.battery_present; 136 } 137 138 static int acpi_battery_technology(struct acpi_battery *battery) 139 { 140 if (!strcasecmp("NiCd", battery->type)) 141 return POWER_SUPPLY_TECHNOLOGY_NiCd; 142 if (!strcasecmp("NiMH", battery->type)) 143 return POWER_SUPPLY_TECHNOLOGY_NiMH; 144 if (!strcasecmp("LION", battery->type)) 145 return POWER_SUPPLY_TECHNOLOGY_LION; 146 if (!strncasecmp("LI-ION", battery->type, 6)) 147 return POWER_SUPPLY_TECHNOLOGY_LION; 148 if (!strcasecmp("LiP", battery->type)) 149 return POWER_SUPPLY_TECHNOLOGY_LIPO; 150 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN; 151 } 152 153 static int acpi_battery_get_state(struct acpi_battery *battery); 154 155 static int acpi_battery_is_charged(struct acpi_battery *battery) 156 { 157 /* charging, discharging or critical low */ 158 if (battery->state != 0) 159 return 0; 160 161 /* battery not reporting charge */ 162 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN || 163 battery->capacity_now == 0) 164 return 0; 165 166 /* good batteries update full_charge as the batteries degrade */ 167 if (battery->full_charge_capacity == battery->capacity_now) 168 return 1; 169 170 /* fallback to using design values for broken batteries */ 171 if (battery->design_capacity <= battery->capacity_now) 172 return 1; 173 174 /* we don't do any sort of metric based on percentages */ 175 return 0; 176 } 177 178 static bool acpi_battery_is_degraded(struct acpi_battery *battery) 179 { 180 return ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) && 181 ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity) && 182 battery->full_charge_capacity < battery->design_capacity; 183 } 184 185 static int acpi_battery_handle_discharging(struct acpi_battery *battery) 186 { 187 /* 188 * Some devices wrongly report discharging if the battery's charge level 189 * was above the device's start charging threshold atm the AC adapter 190 * was plugged in and the device thus did not start a new charge cycle. 191 */ 192 if ((battery_ac_is_broken || power_supply_is_system_supplied()) && 193 battery->rate_now == 0) 194 return POWER_SUPPLY_STATUS_NOT_CHARGING; 195 196 return POWER_SUPPLY_STATUS_DISCHARGING; 197 } 198 199 static int acpi_battery_get_property(struct power_supply *psy, 200 enum power_supply_property psp, 201 union power_supply_propval *val) 202 { 203 int full_capacity = ACPI_BATTERY_VALUE_UNKNOWN, ret = 0; 204 struct acpi_battery *battery = to_acpi_battery(psy); 205 206 if (acpi_battery_present(battery)) { 207 /* run battery update only if it is present */ 208 acpi_battery_get_state(battery); 209 } else if (psp != POWER_SUPPLY_PROP_PRESENT) 210 return -ENODEV; 211 switch (psp) { 212 case POWER_SUPPLY_PROP_STATUS: 213 if (battery->state & ACPI_BATTERY_STATE_DISCHARGING) 214 val->intval = acpi_battery_handle_discharging(battery); 215 else if (battery->state & ACPI_BATTERY_STATE_CHARGING) 216 val->intval = POWER_SUPPLY_STATUS_CHARGING; 217 else if (acpi_battery_is_charged(battery)) 218 val->intval = POWER_SUPPLY_STATUS_FULL; 219 else if (battery_quirk_notcharging) 220 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; 221 else 222 val->intval = POWER_SUPPLY_STATUS_UNKNOWN; 223 break; 224 case POWER_SUPPLY_PROP_PRESENT: 225 val->intval = acpi_battery_present(battery); 226 break; 227 case POWER_SUPPLY_PROP_TECHNOLOGY: 228 val->intval = acpi_battery_technology(battery); 229 break; 230 case POWER_SUPPLY_PROP_CYCLE_COUNT: 231 val->intval = battery->cycle_count; 232 break; 233 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: 234 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN) 235 ret = -ENODEV; 236 else 237 val->intval = battery->design_voltage * 1000; 238 break; 239 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 240 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN) 241 ret = -ENODEV; 242 else 243 val->intval = battery->voltage_now * 1000; 244 break; 245 case POWER_SUPPLY_PROP_CURRENT_NOW: 246 case POWER_SUPPLY_PROP_POWER_NOW: 247 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN) 248 ret = -ENODEV; 249 else 250 val->intval = battery->rate_now * 1000; 251 break; 252 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 253 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: 254 if (!ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) 255 ret = -ENODEV; 256 else 257 val->intval = battery->design_capacity * 1000; 258 break; 259 case POWER_SUPPLY_PROP_CHARGE_FULL: 260 case POWER_SUPPLY_PROP_ENERGY_FULL: 261 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity)) 262 ret = -ENODEV; 263 else 264 val->intval = battery->full_charge_capacity * 1000; 265 break; 266 case POWER_SUPPLY_PROP_CHARGE_NOW: 267 case POWER_SUPPLY_PROP_ENERGY_NOW: 268 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN) 269 ret = -ENODEV; 270 else 271 val->intval = battery->capacity_now * 1000; 272 break; 273 case POWER_SUPPLY_PROP_CAPACITY: 274 if (ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity)) 275 full_capacity = battery->full_charge_capacity; 276 else if (ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) 277 full_capacity = battery->design_capacity; 278 279 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN || 280 full_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 281 ret = -ENODEV; 282 else 283 val->intval = battery->capacity_now * 100/ 284 full_capacity; 285 break; 286 case POWER_SUPPLY_PROP_CAPACITY_LEVEL: 287 if (battery->state & ACPI_BATTERY_STATE_CRITICAL) 288 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL; 289 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) && 290 (battery->capacity_now <= battery->alarm)) 291 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW; 292 else if (acpi_battery_is_charged(battery)) 293 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL; 294 else 295 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; 296 break; 297 case POWER_SUPPLY_PROP_MODEL_NAME: 298 val->strval = battery->model_number; 299 break; 300 case POWER_SUPPLY_PROP_MANUFACTURER: 301 val->strval = battery->oem_info; 302 break; 303 case POWER_SUPPLY_PROP_SERIAL_NUMBER: 304 val->strval = battery->serial_number; 305 break; 306 default: 307 ret = -EINVAL; 308 } 309 return ret; 310 } 311 312 static enum power_supply_property charge_battery_props[] = { 313 POWER_SUPPLY_PROP_STATUS, 314 POWER_SUPPLY_PROP_PRESENT, 315 POWER_SUPPLY_PROP_TECHNOLOGY, 316 POWER_SUPPLY_PROP_CYCLE_COUNT, 317 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 318 POWER_SUPPLY_PROP_VOLTAGE_NOW, 319 POWER_SUPPLY_PROP_CURRENT_NOW, 320 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 321 POWER_SUPPLY_PROP_CHARGE_FULL, 322 POWER_SUPPLY_PROP_CHARGE_NOW, 323 POWER_SUPPLY_PROP_CAPACITY, 324 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 325 POWER_SUPPLY_PROP_MODEL_NAME, 326 POWER_SUPPLY_PROP_MANUFACTURER, 327 POWER_SUPPLY_PROP_SERIAL_NUMBER, 328 }; 329 330 static enum power_supply_property charge_battery_full_cap_broken_props[] = { 331 POWER_SUPPLY_PROP_STATUS, 332 POWER_SUPPLY_PROP_PRESENT, 333 POWER_SUPPLY_PROP_TECHNOLOGY, 334 POWER_SUPPLY_PROP_CYCLE_COUNT, 335 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 336 POWER_SUPPLY_PROP_VOLTAGE_NOW, 337 POWER_SUPPLY_PROP_CURRENT_NOW, 338 POWER_SUPPLY_PROP_CHARGE_NOW, 339 POWER_SUPPLY_PROP_MODEL_NAME, 340 POWER_SUPPLY_PROP_MANUFACTURER, 341 POWER_SUPPLY_PROP_SERIAL_NUMBER, 342 }; 343 344 static enum power_supply_property energy_battery_props[] = { 345 POWER_SUPPLY_PROP_STATUS, 346 POWER_SUPPLY_PROP_PRESENT, 347 POWER_SUPPLY_PROP_TECHNOLOGY, 348 POWER_SUPPLY_PROP_CYCLE_COUNT, 349 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 350 POWER_SUPPLY_PROP_VOLTAGE_NOW, 351 POWER_SUPPLY_PROP_POWER_NOW, 352 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 353 POWER_SUPPLY_PROP_ENERGY_FULL, 354 POWER_SUPPLY_PROP_ENERGY_NOW, 355 POWER_SUPPLY_PROP_CAPACITY, 356 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 357 POWER_SUPPLY_PROP_MODEL_NAME, 358 POWER_SUPPLY_PROP_MANUFACTURER, 359 POWER_SUPPLY_PROP_SERIAL_NUMBER, 360 }; 361 362 static enum power_supply_property energy_battery_full_cap_broken_props[] = { 363 POWER_SUPPLY_PROP_STATUS, 364 POWER_SUPPLY_PROP_PRESENT, 365 POWER_SUPPLY_PROP_TECHNOLOGY, 366 POWER_SUPPLY_PROP_CYCLE_COUNT, 367 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 368 POWER_SUPPLY_PROP_VOLTAGE_NOW, 369 POWER_SUPPLY_PROP_POWER_NOW, 370 POWER_SUPPLY_PROP_ENERGY_NOW, 371 POWER_SUPPLY_PROP_MODEL_NAME, 372 POWER_SUPPLY_PROP_MANUFACTURER, 373 POWER_SUPPLY_PROP_SERIAL_NUMBER, 374 }; 375 376 /* Battery Management */ 377 struct acpi_offsets { 378 size_t offset; /* offset inside struct acpi_sbs_battery */ 379 u8 mode; /* int or string? */ 380 }; 381 382 static const struct acpi_offsets state_offsets[] = { 383 {offsetof(struct acpi_battery, state), 0}, 384 {offsetof(struct acpi_battery, rate_now), 0}, 385 {offsetof(struct acpi_battery, capacity_now), 0}, 386 {offsetof(struct acpi_battery, voltage_now), 0}, 387 }; 388 389 static const struct acpi_offsets info_offsets[] = { 390 {offsetof(struct acpi_battery, power_unit), 0}, 391 {offsetof(struct acpi_battery, design_capacity), 0}, 392 {offsetof(struct acpi_battery, full_charge_capacity), 0}, 393 {offsetof(struct acpi_battery, technology), 0}, 394 {offsetof(struct acpi_battery, design_voltage), 0}, 395 {offsetof(struct acpi_battery, design_capacity_warning), 0}, 396 {offsetof(struct acpi_battery, design_capacity_low), 0}, 397 {offsetof(struct acpi_battery, capacity_granularity_1), 0}, 398 {offsetof(struct acpi_battery, capacity_granularity_2), 0}, 399 {offsetof(struct acpi_battery, model_number), 1}, 400 {offsetof(struct acpi_battery, serial_number), 1}, 401 {offsetof(struct acpi_battery, type), 1}, 402 {offsetof(struct acpi_battery, oem_info), 1}, 403 }; 404 405 static const struct acpi_offsets extended_info_offsets[] = { 406 {offsetof(struct acpi_battery, revision), 0}, 407 {offsetof(struct acpi_battery, power_unit), 0}, 408 {offsetof(struct acpi_battery, design_capacity), 0}, 409 {offsetof(struct acpi_battery, full_charge_capacity), 0}, 410 {offsetof(struct acpi_battery, technology), 0}, 411 {offsetof(struct acpi_battery, design_voltage), 0}, 412 {offsetof(struct acpi_battery, design_capacity_warning), 0}, 413 {offsetof(struct acpi_battery, design_capacity_low), 0}, 414 {offsetof(struct acpi_battery, cycle_count), 0}, 415 {offsetof(struct acpi_battery, measurement_accuracy), 0}, 416 {offsetof(struct acpi_battery, max_sampling_time), 0}, 417 {offsetof(struct acpi_battery, min_sampling_time), 0}, 418 {offsetof(struct acpi_battery, max_averaging_interval), 0}, 419 {offsetof(struct acpi_battery, min_averaging_interval), 0}, 420 {offsetof(struct acpi_battery, capacity_granularity_1), 0}, 421 {offsetof(struct acpi_battery, capacity_granularity_2), 0}, 422 {offsetof(struct acpi_battery, model_number), 1}, 423 {offsetof(struct acpi_battery, serial_number), 1}, 424 {offsetof(struct acpi_battery, type), 1}, 425 {offsetof(struct acpi_battery, oem_info), 1}, 426 }; 427 428 static int extract_package(struct acpi_battery *battery, 429 union acpi_object *package, 430 const struct acpi_offsets *offsets, int num) 431 { 432 int i; 433 union acpi_object *element; 434 435 if (package->type != ACPI_TYPE_PACKAGE) 436 return -EFAULT; 437 for (i = 0; i < num; ++i) { 438 if (package->package.count <= i) 439 return -EFAULT; 440 element = &package->package.elements[i]; 441 if (offsets[i].mode) { 442 u8 *ptr = (u8 *)battery + offsets[i].offset; 443 444 if (element->type == ACPI_TYPE_STRING || 445 element->type == ACPI_TYPE_BUFFER) 446 strncpy(ptr, element->string.pointer, 32); 447 else if (element->type == ACPI_TYPE_INTEGER) { 448 strncpy(ptr, (u8 *)&element->integer.value, 449 sizeof(u64)); 450 ptr[sizeof(u64)] = 0; 451 } else 452 *ptr = 0; /* don't have value */ 453 } else { 454 int *x = (int *)((u8 *)battery + offsets[i].offset); 455 *x = (element->type == ACPI_TYPE_INTEGER) ? 456 element->integer.value : -1; 457 } 458 } 459 return 0; 460 } 461 462 static int acpi_battery_get_status(struct acpi_battery *battery) 463 { 464 if (acpi_bus_get_status(battery->device)) { 465 acpi_handle_info(battery->device->handle, 466 "_STA evaluation failed\n"); 467 return -ENODEV; 468 } 469 return 0; 470 } 471 472 473 static int extract_battery_info(const int use_bix, 474 struct acpi_battery *battery, 475 const struct acpi_buffer *buffer) 476 { 477 int result = -EFAULT; 478 479 if (use_bix && battery_bix_broken_package) 480 result = extract_package(battery, buffer->pointer, 481 extended_info_offsets + 1, 482 ARRAY_SIZE(extended_info_offsets) - 1); 483 else if (use_bix) 484 result = extract_package(battery, buffer->pointer, 485 extended_info_offsets, 486 ARRAY_SIZE(extended_info_offsets)); 487 else 488 result = extract_package(battery, buffer->pointer, 489 info_offsets, ARRAY_SIZE(info_offsets)); 490 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) 491 battery->full_charge_capacity = battery->design_capacity; 492 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) && 493 battery->power_unit && battery->design_voltage) { 494 battery->design_capacity = battery->design_capacity * 495 10000 / battery->design_voltage; 496 battery->full_charge_capacity = battery->full_charge_capacity * 497 10000 / battery->design_voltage; 498 battery->design_capacity_warning = 499 battery->design_capacity_warning * 500 10000 / battery->design_voltage; 501 /* Curiously, design_capacity_low, unlike the rest of them, 502 * is correct. 503 */ 504 /* capacity_granularity_* equal 1 on the systems tested, so 505 * it's impossible to tell if they would need an adjustment 506 * or not if their values were higher. 507 */ 508 } 509 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) && 510 battery->capacity_now > battery->full_charge_capacity) 511 battery->capacity_now = battery->full_charge_capacity; 512 513 return result; 514 } 515 516 static int acpi_battery_get_info(struct acpi_battery *battery) 517 { 518 const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags); 519 int use_bix; 520 int result = -ENODEV; 521 522 if (!acpi_battery_present(battery)) 523 return 0; 524 525 526 for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) { 527 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 528 acpi_status status = AE_ERROR; 529 530 mutex_lock(&battery->lock); 531 status = acpi_evaluate_object(battery->device->handle, 532 use_bix ? "_BIX":"_BIF", 533 NULL, &buffer); 534 mutex_unlock(&battery->lock); 535 536 if (ACPI_FAILURE(status)) { 537 acpi_handle_info(battery->device->handle, 538 "%s evaluation failed: %s\n", 539 use_bix ? "_BIX":"_BIF", 540 acpi_format_exception(status)); 541 } else { 542 result = extract_battery_info(use_bix, 543 battery, 544 &buffer); 545 546 kfree(buffer.pointer); 547 break; 548 } 549 } 550 551 if (!result && !use_bix && xinfo) 552 pr_warn(FW_BUG "The _BIX method is broken, using _BIF.\n"); 553 554 return result; 555 } 556 557 static int acpi_battery_get_state(struct acpi_battery *battery) 558 { 559 int result = 0; 560 acpi_status status = 0; 561 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 562 563 if (!acpi_battery_present(battery)) 564 return 0; 565 566 if (battery->update_time && 567 time_before(jiffies, battery->update_time + 568 msecs_to_jiffies(cache_time))) 569 return 0; 570 571 mutex_lock(&battery->lock); 572 status = acpi_evaluate_object(battery->device->handle, "_BST", 573 NULL, &buffer); 574 mutex_unlock(&battery->lock); 575 576 if (ACPI_FAILURE(status)) { 577 acpi_handle_info(battery->device->handle, 578 "_BST evaluation failed: %s", 579 acpi_format_exception(status)); 580 return -ENODEV; 581 } 582 583 result = extract_package(battery, buffer.pointer, 584 state_offsets, ARRAY_SIZE(state_offsets)); 585 battery->update_time = jiffies; 586 kfree(buffer.pointer); 587 588 /* For buggy DSDTs that report negative 16-bit values for either 589 * charging or discharging current and/or report 0 as 65536 590 * due to bad math. 591 */ 592 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA && 593 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN && 594 (s16)(battery->rate_now) < 0) { 595 battery->rate_now = abs((s16)battery->rate_now); 596 pr_warn_once(FW_BUG "(dis)charge rate invalid.\n"); 597 } 598 599 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags) 600 && battery->capacity_now >= 0 && battery->capacity_now <= 100) 601 battery->capacity_now = (battery->capacity_now * 602 battery->full_charge_capacity) / 100; 603 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) && 604 battery->power_unit && battery->design_voltage) { 605 battery->capacity_now = battery->capacity_now * 606 10000 / battery->design_voltage; 607 } 608 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) && 609 battery->capacity_now > battery->full_charge_capacity) 610 battery->capacity_now = battery->full_charge_capacity; 611 612 return result; 613 } 614 615 static int acpi_battery_set_alarm(struct acpi_battery *battery) 616 { 617 acpi_status status = 0; 618 619 if (!acpi_battery_present(battery) || 620 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags)) 621 return -ENODEV; 622 623 mutex_lock(&battery->lock); 624 status = acpi_execute_simple_method(battery->device->handle, "_BTP", 625 battery->alarm); 626 mutex_unlock(&battery->lock); 627 628 if (ACPI_FAILURE(status)) 629 return -ENODEV; 630 631 acpi_handle_debug(battery->device->handle, "Alarm set to %d\n", 632 battery->alarm); 633 634 return 0; 635 } 636 637 static int acpi_battery_init_alarm(struct acpi_battery *battery) 638 { 639 /* See if alarms are supported, and if so, set default */ 640 if (!acpi_has_method(battery->device->handle, "_BTP")) { 641 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags); 642 return 0; 643 } 644 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags); 645 if (!battery->alarm) 646 battery->alarm = battery->design_capacity_warning; 647 return acpi_battery_set_alarm(battery); 648 } 649 650 static ssize_t acpi_battery_alarm_show(struct device *dev, 651 struct device_attribute *attr, 652 char *buf) 653 { 654 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 655 656 return sprintf(buf, "%d\n", battery->alarm * 1000); 657 } 658 659 static ssize_t acpi_battery_alarm_store(struct device *dev, 660 struct device_attribute *attr, 661 const char *buf, size_t count) 662 { 663 unsigned long x; 664 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 665 666 if (sscanf(buf, "%lu\n", &x) == 1) 667 battery->alarm = x/1000; 668 if (acpi_battery_present(battery)) 669 acpi_battery_set_alarm(battery); 670 return count; 671 } 672 673 static const struct device_attribute alarm_attr = { 674 .attr = {.name = "alarm", .mode = 0644}, 675 .show = acpi_battery_alarm_show, 676 .store = acpi_battery_alarm_store, 677 }; 678 679 /* 680 * The Battery Hooking API 681 * 682 * This API is used inside other drivers that need to expose 683 * platform-specific behaviour within the generic driver in a 684 * generic way. 685 * 686 */ 687 688 static LIST_HEAD(acpi_battery_list); 689 static LIST_HEAD(battery_hook_list); 690 static DEFINE_MUTEX(hook_mutex); 691 692 static void __battery_hook_unregister(struct acpi_battery_hook *hook, int lock) 693 { 694 struct acpi_battery *battery; 695 /* 696 * In order to remove a hook, we first need to 697 * de-register all the batteries that are registered. 698 */ 699 if (lock) 700 mutex_lock(&hook_mutex); 701 list_for_each_entry(battery, &acpi_battery_list, list) { 702 hook->remove_battery(battery->bat); 703 } 704 list_del(&hook->list); 705 if (lock) 706 mutex_unlock(&hook_mutex); 707 pr_info("extension unregistered: %s\n", hook->name); 708 } 709 710 void battery_hook_unregister(struct acpi_battery_hook *hook) 711 { 712 __battery_hook_unregister(hook, 1); 713 } 714 EXPORT_SYMBOL_GPL(battery_hook_unregister); 715 716 void battery_hook_register(struct acpi_battery_hook *hook) 717 { 718 struct acpi_battery *battery; 719 720 mutex_lock(&hook_mutex); 721 INIT_LIST_HEAD(&hook->list); 722 list_add(&hook->list, &battery_hook_list); 723 /* 724 * Now that the driver is registered, we need 725 * to notify the hook that a battery is available 726 * for each battery, so that the driver may add 727 * its attributes. 728 */ 729 list_for_each_entry(battery, &acpi_battery_list, list) { 730 if (hook->add_battery(battery->bat)) { 731 /* 732 * If a add-battery returns non-zero, 733 * the registration of the extension has failed, 734 * and we will not add it to the list of loaded 735 * hooks. 736 */ 737 pr_err("extension failed to load: %s", hook->name); 738 __battery_hook_unregister(hook, 0); 739 goto end; 740 } 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)) { 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); 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 int __init battery_quirk_not_charging(const struct dmi_system_id *d) 1109 { 1110 battery_quirk_notcharging = 1; 1111 return 0; 1112 } 1113 1114 static const struct dmi_system_id bat_dmi_table[] __initconst = { 1115 { 1116 /* NEC LZ750/LS */ 1117 .callback = battery_bix_broken_package_quirk, 1118 .matches = { 1119 DMI_MATCH(DMI_SYS_VENDOR, "NEC"), 1120 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"), 1121 }, 1122 }, 1123 { 1124 /* Acer Aspire V5-573G */ 1125 .callback = battery_notification_delay_quirk, 1126 .matches = { 1127 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 1128 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"), 1129 }, 1130 }, 1131 { 1132 /* Point of View mobii wintab p800w */ 1133 .callback = battery_ac_is_broken_quirk, 1134 .matches = { 1135 DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"), 1136 DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"), 1137 DMI_MATCH(DMI_BIOS_VERSION, "3BAIR1013"), 1138 /* Above matches are too generic, add bios-date match */ 1139 DMI_MATCH(DMI_BIOS_DATE, "08/22/2014"), 1140 }, 1141 }, 1142 { 1143 /* 1144 * On Lenovo ThinkPads the BIOS specification defines 1145 * a state when the bits for charging and discharging 1146 * are both set to 0. That state is "Not Charging". 1147 */ 1148 .callback = battery_quirk_not_charging, 1149 .ident = "Lenovo ThinkPad", 1150 .matches = { 1151 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 1152 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad"), 1153 }, 1154 }, 1155 { 1156 /* Microsoft Surface Go 3 */ 1157 .callback = battery_notification_delay_quirk, 1158 .matches = { 1159 DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), 1160 DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go 3"), 1161 }, 1162 }, 1163 {}, 1164 }; 1165 1166 /* 1167 * Some machines'(E,G Lenovo Z480) ECs are not stable 1168 * during boot up and this causes battery driver fails to be 1169 * probed due to failure of getting battery information 1170 * from EC sometimes. After several retries, the operation 1171 * may work. So add retry code here and 20ms sleep between 1172 * every retries. 1173 */ 1174 static int acpi_battery_update_retry(struct acpi_battery *battery) 1175 { 1176 int retry, ret; 1177 1178 for (retry = 5; retry; retry--) { 1179 ret = acpi_battery_update(battery, false); 1180 if (!ret) 1181 break; 1182 1183 msleep(20); 1184 } 1185 return ret; 1186 } 1187 1188 static int acpi_battery_add(struct acpi_device *device) 1189 { 1190 int result = 0; 1191 struct acpi_battery *battery = NULL; 1192 1193 if (!device) 1194 return -EINVAL; 1195 1196 if (device->dep_unmet) 1197 return -EPROBE_DEFER; 1198 1199 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL); 1200 if (!battery) 1201 return -ENOMEM; 1202 battery->device = device; 1203 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME); 1204 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS); 1205 device->driver_data = battery; 1206 mutex_init(&battery->lock); 1207 mutex_init(&battery->sysfs_lock); 1208 if (acpi_has_method(battery->device->handle, "_BIX")) 1209 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags); 1210 1211 result = acpi_battery_update_retry(battery); 1212 if (result) 1213 goto fail; 1214 1215 pr_info("Slot [%s] (battery %s)\n", acpi_device_bid(device), 1216 device->status.battery_present ? "present" : "absent"); 1217 1218 battery->pm_nb.notifier_call = battery_notify; 1219 register_pm_notifier(&battery->pm_nb); 1220 1221 device_init_wakeup(&device->dev, 1); 1222 1223 return result; 1224 1225 fail: 1226 sysfs_remove_battery(battery); 1227 mutex_destroy(&battery->lock); 1228 mutex_destroy(&battery->sysfs_lock); 1229 kfree(battery); 1230 return result; 1231 } 1232 1233 static int acpi_battery_remove(struct acpi_device *device) 1234 { 1235 struct acpi_battery *battery = NULL; 1236 1237 if (!device || !acpi_driver_data(device)) 1238 return -EINVAL; 1239 device_init_wakeup(&device->dev, 0); 1240 battery = acpi_driver_data(device); 1241 unregister_pm_notifier(&battery->pm_nb); 1242 sysfs_remove_battery(battery); 1243 mutex_destroy(&battery->lock); 1244 mutex_destroy(&battery->sysfs_lock); 1245 kfree(battery); 1246 return 0; 1247 } 1248 1249 #ifdef CONFIG_PM_SLEEP 1250 /* this is needed to learn about changes made in suspended state */ 1251 static int acpi_battery_resume(struct device *dev) 1252 { 1253 struct acpi_battery *battery; 1254 1255 if (!dev) 1256 return -EINVAL; 1257 1258 battery = acpi_driver_data(to_acpi_device(dev)); 1259 if (!battery) 1260 return -EINVAL; 1261 1262 battery->update_time = 0; 1263 acpi_battery_update(battery, true); 1264 return 0; 1265 } 1266 #else 1267 #define acpi_battery_resume NULL 1268 #endif 1269 1270 static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume); 1271 1272 static struct acpi_driver acpi_battery_driver = { 1273 .name = "battery", 1274 .class = ACPI_BATTERY_CLASS, 1275 .ids = battery_device_ids, 1276 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS, 1277 .ops = { 1278 .add = acpi_battery_add, 1279 .remove = acpi_battery_remove, 1280 .notify = acpi_battery_notify, 1281 }, 1282 .drv.pm = &acpi_battery_pm, 1283 }; 1284 1285 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie) 1286 { 1287 int result; 1288 1289 if (acpi_quirk_skip_acpi_ac_and_battery()) 1290 return; 1291 1292 dmi_check_system(bat_dmi_table); 1293 1294 result = acpi_bus_register_driver(&acpi_battery_driver); 1295 battery_driver_registered = (result == 0); 1296 } 1297 1298 static int __init acpi_battery_init(void) 1299 { 1300 if (acpi_disabled) 1301 return -ENODEV; 1302 1303 async_cookie = async_schedule(acpi_battery_init_async, NULL); 1304 return 0; 1305 } 1306 1307 static void __exit acpi_battery_exit(void) 1308 { 1309 async_synchronize_cookie(async_cookie + 1); 1310 if (battery_driver_registered) { 1311 acpi_bus_unregister_driver(&acpi_battery_driver); 1312 battery_hook_exit(); 1313 } 1314 } 1315 1316 module_init(acpi_battery_init); 1317 module_exit(acpi_battery_exit); 1318