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 {"", 0}, 63 }; 64 65 MODULE_DEVICE_TABLE(acpi, battery_device_ids); 66 67 enum { 68 ACPI_BATTERY_ALARM_PRESENT, 69 ACPI_BATTERY_XINFO_PRESENT, 70 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, 71 /* On Lenovo Thinkpad models from 2010 and 2011, the power unit 72 * switches between mWh and mAh depending on whether the system 73 * is running on battery or not. When mAh is the unit, most 74 * reported values are incorrect and need to be adjusted by 75 * 10000/design_voltage. Verified on x201, t410, t410s, and x220. 76 * Pre-2010 and 2012 models appear to always report in mWh and 77 * are thus unaffected (tested with t42, t61, t500, x200, x300, 78 * and x230). Also, in mid-2012 Lenovo issued a BIOS update for 79 * the 2011 models that fixes the issue (tested on x220 with a 80 * post-1.29 BIOS), but as of Nov. 2012, no such update is 81 * available for the 2010 models. 82 */ 83 ACPI_BATTERY_QUIRK_THINKPAD_MAH, 84 /* for batteries reporting current capacity with design capacity 85 * on a full charge, but showing degradation in full charge cap. 86 */ 87 ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, 88 }; 89 90 struct acpi_battery { 91 struct mutex lock; 92 struct mutex sysfs_lock; 93 struct power_supply *bat; 94 struct power_supply_desc bat_desc; 95 struct acpi_device *device; 96 struct notifier_block pm_nb; 97 struct list_head list; 98 unsigned long update_time; 99 int revision; 100 int rate_now; 101 int capacity_now; 102 int voltage_now; 103 int design_capacity; 104 int full_charge_capacity; 105 int technology; 106 int design_voltage; 107 int design_capacity_warning; 108 int design_capacity_low; 109 int cycle_count; 110 int measurement_accuracy; 111 int max_sampling_time; 112 int min_sampling_time; 113 int max_averaging_interval; 114 int min_averaging_interval; 115 int capacity_granularity_1; 116 int capacity_granularity_2; 117 int alarm; 118 char model_number[32]; 119 char serial_number[32]; 120 char type[32]; 121 char oem_info[32]; 122 int state; 123 int power_unit; 124 unsigned long flags; 125 }; 126 127 #define to_acpi_battery(x) power_supply_get_drvdata(x) 128 129 static inline int acpi_battery_present(struct acpi_battery *battery) 130 { 131 return battery->device->status.battery_present; 132 } 133 134 static int acpi_battery_technology(struct acpi_battery *battery) 135 { 136 if (!strcasecmp("NiCd", battery->type)) 137 return POWER_SUPPLY_TECHNOLOGY_NiCd; 138 if (!strcasecmp("NiMH", battery->type)) 139 return POWER_SUPPLY_TECHNOLOGY_NiMH; 140 if (!strcasecmp("LION", battery->type)) 141 return POWER_SUPPLY_TECHNOLOGY_LION; 142 if (!strncasecmp("LI-ION", battery->type, 6)) 143 return POWER_SUPPLY_TECHNOLOGY_LION; 144 if (!strcasecmp("LiP", battery->type)) 145 return POWER_SUPPLY_TECHNOLOGY_LIPO; 146 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN; 147 } 148 149 static int acpi_battery_get_state(struct acpi_battery *battery); 150 151 static int acpi_battery_is_charged(struct acpi_battery *battery) 152 { 153 /* charging, discharging or critical low */ 154 if (battery->state != 0) 155 return 0; 156 157 /* battery not reporting charge */ 158 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN || 159 battery->capacity_now == 0) 160 return 0; 161 162 /* good batteries update full_charge as the batteries degrade */ 163 if (battery->full_charge_capacity == battery->capacity_now) 164 return 1; 165 166 /* fallback to using design values for broken batteries */ 167 if (battery->design_capacity <= battery->capacity_now) 168 return 1; 169 170 /* we don't do any sort of metric based on percentages */ 171 return 0; 172 } 173 174 static bool acpi_battery_is_degraded(struct acpi_battery *battery) 175 { 176 return ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) && 177 ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity) && 178 battery->full_charge_capacity < battery->design_capacity; 179 } 180 181 static int acpi_battery_handle_discharging(struct acpi_battery *battery) 182 { 183 /* 184 * Some devices wrongly report discharging if the battery's charge level 185 * was above the device's start charging threshold atm the AC adapter 186 * was plugged in and the device thus did not start a new charge cycle. 187 */ 188 if ((battery_ac_is_broken || power_supply_is_system_supplied()) && 189 battery->rate_now == 0) 190 return POWER_SUPPLY_STATUS_NOT_CHARGING; 191 192 return POWER_SUPPLY_STATUS_DISCHARGING; 193 } 194 195 static int acpi_battery_get_property(struct power_supply *psy, 196 enum power_supply_property psp, 197 union power_supply_propval *val) 198 { 199 int full_capacity = ACPI_BATTERY_VALUE_UNKNOWN, ret = 0; 200 struct acpi_battery *battery = to_acpi_battery(psy); 201 202 if (acpi_battery_present(battery)) { 203 /* run battery update only if it is present */ 204 acpi_battery_get_state(battery); 205 } else if (psp != POWER_SUPPLY_PROP_PRESENT) 206 return -ENODEV; 207 switch (psp) { 208 case POWER_SUPPLY_PROP_STATUS: 209 if (battery->state & ACPI_BATTERY_STATE_DISCHARGING) 210 val->intval = acpi_battery_handle_discharging(battery); 211 else if (battery->state & ACPI_BATTERY_STATE_CHARGING) 212 val->intval = POWER_SUPPLY_STATUS_CHARGING; 213 else if (acpi_battery_is_charged(battery)) 214 val->intval = POWER_SUPPLY_STATUS_FULL; 215 else if (battery_quirk_notcharging) 216 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; 217 else 218 val->intval = POWER_SUPPLY_STATUS_UNKNOWN; 219 break; 220 case POWER_SUPPLY_PROP_PRESENT: 221 val->intval = acpi_battery_present(battery); 222 break; 223 case POWER_SUPPLY_PROP_TECHNOLOGY: 224 val->intval = acpi_battery_technology(battery); 225 break; 226 case POWER_SUPPLY_PROP_CYCLE_COUNT: 227 val->intval = battery->cycle_count; 228 break; 229 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: 230 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN) 231 ret = -ENODEV; 232 else 233 val->intval = battery->design_voltage * 1000; 234 break; 235 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 236 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN) 237 ret = -ENODEV; 238 else 239 val->intval = battery->voltage_now * 1000; 240 break; 241 case POWER_SUPPLY_PROP_CURRENT_NOW: 242 case POWER_SUPPLY_PROP_POWER_NOW: 243 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN) 244 ret = -ENODEV; 245 else 246 val->intval = battery->rate_now * 1000; 247 break; 248 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 249 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: 250 if (!ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) 251 ret = -ENODEV; 252 else 253 val->intval = battery->design_capacity * 1000; 254 break; 255 case POWER_SUPPLY_PROP_CHARGE_FULL: 256 case POWER_SUPPLY_PROP_ENERGY_FULL: 257 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity)) 258 ret = -ENODEV; 259 else 260 val->intval = battery->full_charge_capacity * 1000; 261 break; 262 case POWER_SUPPLY_PROP_CHARGE_NOW: 263 case POWER_SUPPLY_PROP_ENERGY_NOW: 264 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN) 265 ret = -ENODEV; 266 else 267 val->intval = battery->capacity_now * 1000; 268 break; 269 case POWER_SUPPLY_PROP_CAPACITY: 270 if (ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity)) 271 full_capacity = battery->full_charge_capacity; 272 else if (ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) 273 full_capacity = battery->design_capacity; 274 275 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN || 276 full_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 277 ret = -ENODEV; 278 else 279 val->intval = battery->capacity_now * 100/ 280 full_capacity; 281 break; 282 case POWER_SUPPLY_PROP_CAPACITY_LEVEL: 283 if (battery->state & ACPI_BATTERY_STATE_CRITICAL) 284 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL; 285 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) && 286 (battery->capacity_now <= battery->alarm)) 287 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW; 288 else if (acpi_battery_is_charged(battery)) 289 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL; 290 else 291 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; 292 break; 293 case POWER_SUPPLY_PROP_MODEL_NAME: 294 val->strval = battery->model_number; 295 break; 296 case POWER_SUPPLY_PROP_MANUFACTURER: 297 val->strval = battery->oem_info; 298 break; 299 case POWER_SUPPLY_PROP_SERIAL_NUMBER: 300 val->strval = battery->serial_number; 301 break; 302 default: 303 ret = -EINVAL; 304 } 305 return ret; 306 } 307 308 static enum power_supply_property charge_battery_props[] = { 309 POWER_SUPPLY_PROP_STATUS, 310 POWER_SUPPLY_PROP_PRESENT, 311 POWER_SUPPLY_PROP_TECHNOLOGY, 312 POWER_SUPPLY_PROP_CYCLE_COUNT, 313 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 314 POWER_SUPPLY_PROP_VOLTAGE_NOW, 315 POWER_SUPPLY_PROP_CURRENT_NOW, 316 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 317 POWER_SUPPLY_PROP_CHARGE_FULL, 318 POWER_SUPPLY_PROP_CHARGE_NOW, 319 POWER_SUPPLY_PROP_CAPACITY, 320 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 321 POWER_SUPPLY_PROP_MODEL_NAME, 322 POWER_SUPPLY_PROP_MANUFACTURER, 323 POWER_SUPPLY_PROP_SERIAL_NUMBER, 324 }; 325 326 static enum power_supply_property charge_battery_full_cap_broken_props[] = { 327 POWER_SUPPLY_PROP_STATUS, 328 POWER_SUPPLY_PROP_PRESENT, 329 POWER_SUPPLY_PROP_TECHNOLOGY, 330 POWER_SUPPLY_PROP_CYCLE_COUNT, 331 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 332 POWER_SUPPLY_PROP_VOLTAGE_NOW, 333 POWER_SUPPLY_PROP_CURRENT_NOW, 334 POWER_SUPPLY_PROP_CHARGE_NOW, 335 POWER_SUPPLY_PROP_MODEL_NAME, 336 POWER_SUPPLY_PROP_MANUFACTURER, 337 POWER_SUPPLY_PROP_SERIAL_NUMBER, 338 }; 339 340 static enum power_supply_property energy_battery_props[] = { 341 POWER_SUPPLY_PROP_STATUS, 342 POWER_SUPPLY_PROP_PRESENT, 343 POWER_SUPPLY_PROP_TECHNOLOGY, 344 POWER_SUPPLY_PROP_CYCLE_COUNT, 345 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 346 POWER_SUPPLY_PROP_VOLTAGE_NOW, 347 POWER_SUPPLY_PROP_POWER_NOW, 348 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 349 POWER_SUPPLY_PROP_ENERGY_FULL, 350 POWER_SUPPLY_PROP_ENERGY_NOW, 351 POWER_SUPPLY_PROP_CAPACITY, 352 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 353 POWER_SUPPLY_PROP_MODEL_NAME, 354 POWER_SUPPLY_PROP_MANUFACTURER, 355 POWER_SUPPLY_PROP_SERIAL_NUMBER, 356 }; 357 358 static enum power_supply_property energy_battery_full_cap_broken_props[] = { 359 POWER_SUPPLY_PROP_STATUS, 360 POWER_SUPPLY_PROP_PRESENT, 361 POWER_SUPPLY_PROP_TECHNOLOGY, 362 POWER_SUPPLY_PROP_CYCLE_COUNT, 363 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 364 POWER_SUPPLY_PROP_VOLTAGE_NOW, 365 POWER_SUPPLY_PROP_POWER_NOW, 366 POWER_SUPPLY_PROP_ENERGY_NOW, 367 POWER_SUPPLY_PROP_MODEL_NAME, 368 POWER_SUPPLY_PROP_MANUFACTURER, 369 POWER_SUPPLY_PROP_SERIAL_NUMBER, 370 }; 371 372 /* Battery Management */ 373 struct acpi_offsets { 374 size_t offset; /* offset inside struct acpi_sbs_battery */ 375 u8 mode; /* int or string? */ 376 }; 377 378 static const struct acpi_offsets state_offsets[] = { 379 {offsetof(struct acpi_battery, state), 0}, 380 {offsetof(struct acpi_battery, rate_now), 0}, 381 {offsetof(struct acpi_battery, capacity_now), 0}, 382 {offsetof(struct acpi_battery, voltage_now), 0}, 383 }; 384 385 static const struct acpi_offsets info_offsets[] = { 386 {offsetof(struct acpi_battery, power_unit), 0}, 387 {offsetof(struct acpi_battery, design_capacity), 0}, 388 {offsetof(struct acpi_battery, full_charge_capacity), 0}, 389 {offsetof(struct acpi_battery, technology), 0}, 390 {offsetof(struct acpi_battery, design_voltage), 0}, 391 {offsetof(struct acpi_battery, design_capacity_warning), 0}, 392 {offsetof(struct acpi_battery, design_capacity_low), 0}, 393 {offsetof(struct acpi_battery, capacity_granularity_1), 0}, 394 {offsetof(struct acpi_battery, capacity_granularity_2), 0}, 395 {offsetof(struct acpi_battery, model_number), 1}, 396 {offsetof(struct acpi_battery, serial_number), 1}, 397 {offsetof(struct acpi_battery, type), 1}, 398 {offsetof(struct acpi_battery, oem_info), 1}, 399 }; 400 401 static const struct acpi_offsets extended_info_offsets[] = { 402 {offsetof(struct acpi_battery, revision), 0}, 403 {offsetof(struct acpi_battery, power_unit), 0}, 404 {offsetof(struct acpi_battery, design_capacity), 0}, 405 {offsetof(struct acpi_battery, full_charge_capacity), 0}, 406 {offsetof(struct acpi_battery, technology), 0}, 407 {offsetof(struct acpi_battery, design_voltage), 0}, 408 {offsetof(struct acpi_battery, design_capacity_warning), 0}, 409 {offsetof(struct acpi_battery, design_capacity_low), 0}, 410 {offsetof(struct acpi_battery, cycle_count), 0}, 411 {offsetof(struct acpi_battery, measurement_accuracy), 0}, 412 {offsetof(struct acpi_battery, max_sampling_time), 0}, 413 {offsetof(struct acpi_battery, min_sampling_time), 0}, 414 {offsetof(struct acpi_battery, max_averaging_interval), 0}, 415 {offsetof(struct acpi_battery, min_averaging_interval), 0}, 416 {offsetof(struct acpi_battery, capacity_granularity_1), 0}, 417 {offsetof(struct acpi_battery, capacity_granularity_2), 0}, 418 {offsetof(struct acpi_battery, model_number), 1}, 419 {offsetof(struct acpi_battery, serial_number), 1}, 420 {offsetof(struct acpi_battery, type), 1}, 421 {offsetof(struct acpi_battery, oem_info), 1}, 422 }; 423 424 static int extract_package(struct acpi_battery *battery, 425 union acpi_object *package, 426 const struct acpi_offsets *offsets, int num) 427 { 428 int i; 429 union acpi_object *element; 430 431 if (package->type != ACPI_TYPE_PACKAGE) 432 return -EFAULT; 433 for (i = 0; i < num; ++i) { 434 if (package->package.count <= i) 435 return -EFAULT; 436 element = &package->package.elements[i]; 437 if (offsets[i].mode) { 438 u8 *ptr = (u8 *)battery + offsets[i].offset; 439 440 if (element->type == ACPI_TYPE_STRING || 441 element->type == ACPI_TYPE_BUFFER) 442 strncpy(ptr, element->string.pointer, 32); 443 else if (element->type == ACPI_TYPE_INTEGER) { 444 strncpy(ptr, (u8 *)&element->integer.value, 445 sizeof(u64)); 446 ptr[sizeof(u64)] = 0; 447 } else 448 *ptr = 0; /* don't have value */ 449 } else { 450 int *x = (int *)((u8 *)battery + offsets[i].offset); 451 *x = (element->type == ACPI_TYPE_INTEGER) ? 452 element->integer.value : -1; 453 } 454 } 455 return 0; 456 } 457 458 static int acpi_battery_get_status(struct acpi_battery *battery) 459 { 460 if (acpi_bus_get_status(battery->device)) { 461 acpi_handle_info(battery->device->handle, 462 "_STA evaluation failed\n"); 463 return -ENODEV; 464 } 465 return 0; 466 } 467 468 469 static int extract_battery_info(const int use_bix, 470 struct acpi_battery *battery, 471 const struct acpi_buffer *buffer) 472 { 473 int result = -EFAULT; 474 475 if (use_bix && battery_bix_broken_package) 476 result = extract_package(battery, buffer->pointer, 477 extended_info_offsets + 1, 478 ARRAY_SIZE(extended_info_offsets) - 1); 479 else if (use_bix) 480 result = extract_package(battery, buffer->pointer, 481 extended_info_offsets, 482 ARRAY_SIZE(extended_info_offsets)); 483 else 484 result = extract_package(battery, buffer->pointer, 485 info_offsets, ARRAY_SIZE(info_offsets)); 486 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) 487 battery->full_charge_capacity = battery->design_capacity; 488 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) && 489 battery->power_unit && battery->design_voltage) { 490 battery->design_capacity = battery->design_capacity * 491 10000 / battery->design_voltage; 492 battery->full_charge_capacity = battery->full_charge_capacity * 493 10000 / battery->design_voltage; 494 battery->design_capacity_warning = 495 battery->design_capacity_warning * 496 10000 / battery->design_voltage; 497 /* Curiously, design_capacity_low, unlike the rest of them, 498 * is correct. 499 */ 500 /* capacity_granularity_* equal 1 on the systems tested, so 501 * it's impossible to tell if they would need an adjustment 502 * or not if their values were higher. 503 */ 504 } 505 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) && 506 battery->capacity_now > battery->full_charge_capacity) 507 battery->capacity_now = battery->full_charge_capacity; 508 509 return result; 510 } 511 512 static int acpi_battery_get_info(struct acpi_battery *battery) 513 { 514 const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags); 515 int use_bix; 516 int result = -ENODEV; 517 518 if (!acpi_battery_present(battery)) 519 return 0; 520 521 522 for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) { 523 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 524 acpi_status status = AE_ERROR; 525 526 mutex_lock(&battery->lock); 527 status = acpi_evaluate_object(battery->device->handle, 528 use_bix ? "_BIX":"_BIF", 529 NULL, &buffer); 530 mutex_unlock(&battery->lock); 531 532 if (ACPI_FAILURE(status)) { 533 acpi_handle_info(battery->device->handle, 534 "%s evaluation failed: %s\n", 535 use_bix ? "_BIX":"_BIF", 536 acpi_format_exception(status)); 537 } else { 538 result = extract_battery_info(use_bix, 539 battery, 540 &buffer); 541 542 kfree(buffer.pointer); 543 break; 544 } 545 } 546 547 if (!result && !use_bix && xinfo) 548 pr_warn(FW_BUG "The _BIX method is broken, using _BIF.\n"); 549 550 return result; 551 } 552 553 static int acpi_battery_get_state(struct acpi_battery *battery) 554 { 555 int result = 0; 556 acpi_status status = 0; 557 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 558 559 if (!acpi_battery_present(battery)) 560 return 0; 561 562 if (battery->update_time && 563 time_before(jiffies, battery->update_time + 564 msecs_to_jiffies(cache_time))) 565 return 0; 566 567 mutex_lock(&battery->lock); 568 status = acpi_evaluate_object(battery->device->handle, "_BST", 569 NULL, &buffer); 570 mutex_unlock(&battery->lock); 571 572 if (ACPI_FAILURE(status)) { 573 acpi_handle_info(battery->device->handle, 574 "_BST evaluation failed: %s", 575 acpi_format_exception(status)); 576 return -ENODEV; 577 } 578 579 result = extract_package(battery, buffer.pointer, 580 state_offsets, ARRAY_SIZE(state_offsets)); 581 battery->update_time = jiffies; 582 kfree(buffer.pointer); 583 584 /* For buggy DSDTs that report negative 16-bit values for either 585 * charging or discharging current and/or report 0 as 65536 586 * due to bad math. 587 */ 588 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA && 589 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN && 590 (s16)(battery->rate_now) < 0) { 591 battery->rate_now = abs((s16)battery->rate_now); 592 pr_warn_once(FW_BUG "(dis)charge rate invalid.\n"); 593 } 594 595 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags) 596 && battery->capacity_now >= 0 && battery->capacity_now <= 100) 597 battery->capacity_now = (battery->capacity_now * 598 battery->full_charge_capacity) / 100; 599 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) && 600 battery->power_unit && battery->design_voltage) { 601 battery->capacity_now = battery->capacity_now * 602 10000 / battery->design_voltage; 603 } 604 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) && 605 battery->capacity_now > battery->full_charge_capacity) 606 battery->capacity_now = battery->full_charge_capacity; 607 608 return result; 609 } 610 611 static int acpi_battery_set_alarm(struct acpi_battery *battery) 612 { 613 acpi_status status = 0; 614 615 if (!acpi_battery_present(battery) || 616 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags)) 617 return -ENODEV; 618 619 mutex_lock(&battery->lock); 620 status = acpi_execute_simple_method(battery->device->handle, "_BTP", 621 battery->alarm); 622 mutex_unlock(&battery->lock); 623 624 if (ACPI_FAILURE(status)) 625 return -ENODEV; 626 627 acpi_handle_debug(battery->device->handle, "Alarm set to %d\n", 628 battery->alarm); 629 630 return 0; 631 } 632 633 static int acpi_battery_init_alarm(struct acpi_battery *battery) 634 { 635 /* See if alarms are supported, and if so, set default */ 636 if (!acpi_has_method(battery->device->handle, "_BTP")) { 637 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags); 638 return 0; 639 } 640 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags); 641 if (!battery->alarm) 642 battery->alarm = battery->design_capacity_warning; 643 return acpi_battery_set_alarm(battery); 644 } 645 646 static ssize_t acpi_battery_alarm_show(struct device *dev, 647 struct device_attribute *attr, 648 char *buf) 649 { 650 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 651 652 return sprintf(buf, "%d\n", battery->alarm * 1000); 653 } 654 655 static ssize_t acpi_battery_alarm_store(struct device *dev, 656 struct device_attribute *attr, 657 const char *buf, size_t count) 658 { 659 unsigned long x; 660 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 661 662 if (sscanf(buf, "%lu\n", &x) == 1) 663 battery->alarm = x/1000; 664 if (acpi_battery_present(battery)) 665 acpi_battery_set_alarm(battery); 666 return count; 667 } 668 669 static const struct device_attribute alarm_attr = { 670 .attr = {.name = "alarm", .mode = 0644}, 671 .show = acpi_battery_alarm_show, 672 .store = acpi_battery_alarm_store, 673 }; 674 675 /* 676 * The Battery Hooking API 677 * 678 * This API is used inside other drivers that need to expose 679 * platform-specific behaviour within the generic driver in a 680 * generic way. 681 * 682 */ 683 684 static LIST_HEAD(acpi_battery_list); 685 static LIST_HEAD(battery_hook_list); 686 static DEFINE_MUTEX(hook_mutex); 687 688 static void __battery_hook_unregister(struct acpi_battery_hook *hook, int lock) 689 { 690 struct acpi_battery *battery; 691 /* 692 * In order to remove a hook, we first need to 693 * de-register all the batteries that are registered. 694 */ 695 if (lock) 696 mutex_lock(&hook_mutex); 697 list_for_each_entry(battery, &acpi_battery_list, list) { 698 hook->remove_battery(battery->bat); 699 } 700 list_del(&hook->list); 701 if (lock) 702 mutex_unlock(&hook_mutex); 703 pr_info("extension unregistered: %s\n", hook->name); 704 } 705 706 void battery_hook_unregister(struct acpi_battery_hook *hook) 707 { 708 __battery_hook_unregister(hook, 1); 709 } 710 EXPORT_SYMBOL_GPL(battery_hook_unregister); 711 712 void battery_hook_register(struct acpi_battery_hook *hook) 713 { 714 struct acpi_battery *battery; 715 716 mutex_lock(&hook_mutex); 717 INIT_LIST_HEAD(&hook->list); 718 list_add(&hook->list, &battery_hook_list); 719 /* 720 * Now that the driver is registered, we need 721 * to notify the hook that a battery is available 722 * for each battery, so that the driver may add 723 * its attributes. 724 */ 725 list_for_each_entry(battery, &acpi_battery_list, list) { 726 if (hook->add_battery(battery->bat)) { 727 /* 728 * If a add-battery returns non-zero, 729 * the registration of the extension has failed, 730 * and we will not add it to the list of loaded 731 * hooks. 732 */ 733 pr_err("extension failed to load: %s", hook->name); 734 __battery_hook_unregister(hook, 0); 735 goto end; 736 } 737 } 738 pr_info("new extension: %s\n", hook->name); 739 end: 740 mutex_unlock(&hook_mutex); 741 } 742 EXPORT_SYMBOL_GPL(battery_hook_register); 743 744 /* 745 * This function gets called right after the battery sysfs 746 * attributes have been added, so that the drivers that 747 * define custom sysfs attributes can add their own. 748 */ 749 static void battery_hook_add_battery(struct acpi_battery *battery) 750 { 751 struct acpi_battery_hook *hook_node, *tmp; 752 753 mutex_lock(&hook_mutex); 754 INIT_LIST_HEAD(&battery->list); 755 list_add(&battery->list, &acpi_battery_list); 756 /* 757 * Since we added a new battery to the list, we need to 758 * iterate over the hooks and call add_battery for each 759 * hook that was registered. This usually happens 760 * when a battery gets hotplugged or initialized 761 * during the battery module initialization. 762 */ 763 list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) { 764 if (hook_node->add_battery(battery->bat)) { 765 /* 766 * The notification of the extensions has failed, to 767 * prevent further errors we will unload the extension. 768 */ 769 pr_err("error in extension, unloading: %s", 770 hook_node->name); 771 __battery_hook_unregister(hook_node, 0); 772 } 773 } 774 mutex_unlock(&hook_mutex); 775 } 776 777 static void battery_hook_remove_battery(struct acpi_battery *battery) 778 { 779 struct acpi_battery_hook *hook; 780 781 mutex_lock(&hook_mutex); 782 /* 783 * Before removing the hook, we need to remove all 784 * custom attributes from the battery. 785 */ 786 list_for_each_entry(hook, &battery_hook_list, list) { 787 hook->remove_battery(battery->bat); 788 } 789 /* Then, just remove the battery from the list */ 790 list_del(&battery->list); 791 mutex_unlock(&hook_mutex); 792 } 793 794 static void __exit battery_hook_exit(void) 795 { 796 struct acpi_battery_hook *hook; 797 struct acpi_battery_hook *ptr; 798 /* 799 * At this point, the acpi_bus_unregister_driver() 800 * has called remove for all batteries. We just 801 * need to remove the hooks. 802 */ 803 list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) { 804 __battery_hook_unregister(hook, 1); 805 } 806 mutex_destroy(&hook_mutex); 807 } 808 809 static int sysfs_add_battery(struct acpi_battery *battery) 810 { 811 struct power_supply_config psy_cfg = { .drv_data = battery, }; 812 bool full_cap_broken = false; 813 814 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) && 815 !ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) 816 full_cap_broken = true; 817 818 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) { 819 if (full_cap_broken) { 820 battery->bat_desc.properties = 821 charge_battery_full_cap_broken_props; 822 battery->bat_desc.num_properties = 823 ARRAY_SIZE(charge_battery_full_cap_broken_props); 824 } else { 825 battery->bat_desc.properties = charge_battery_props; 826 battery->bat_desc.num_properties = 827 ARRAY_SIZE(charge_battery_props); 828 } 829 } else { 830 if (full_cap_broken) { 831 battery->bat_desc.properties = 832 energy_battery_full_cap_broken_props; 833 battery->bat_desc.num_properties = 834 ARRAY_SIZE(energy_battery_full_cap_broken_props); 835 } else { 836 battery->bat_desc.properties = energy_battery_props; 837 battery->bat_desc.num_properties = 838 ARRAY_SIZE(energy_battery_props); 839 } 840 } 841 842 battery->bat_desc.name = acpi_device_bid(battery->device); 843 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY; 844 battery->bat_desc.get_property = acpi_battery_get_property; 845 846 battery->bat = power_supply_register_no_ws(&battery->device->dev, 847 &battery->bat_desc, &psy_cfg); 848 849 if (IS_ERR(battery->bat)) { 850 int result = PTR_ERR(battery->bat); 851 852 battery->bat = NULL; 853 return result; 854 } 855 battery_hook_add_battery(battery); 856 return device_create_file(&battery->bat->dev, &alarm_attr); 857 } 858 859 static void sysfs_remove_battery(struct acpi_battery *battery) 860 { 861 mutex_lock(&battery->sysfs_lock); 862 if (!battery->bat) { 863 mutex_unlock(&battery->sysfs_lock); 864 return; 865 } 866 battery_hook_remove_battery(battery); 867 device_remove_file(&battery->bat->dev, &alarm_attr); 868 power_supply_unregister(battery->bat); 869 battery->bat = NULL; 870 mutex_unlock(&battery->sysfs_lock); 871 } 872 873 static void find_battery(const struct dmi_header *dm, void *private) 874 { 875 struct acpi_battery *battery = (struct acpi_battery *)private; 876 /* Note: the hardcoded offsets below have been extracted from 877 * the source code of dmidecode. 878 */ 879 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) { 880 const u8 *dmi_data = (const u8 *)(dm + 1); 881 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6)); 882 883 if (dm->length >= 18) 884 dmi_capacity *= dmi_data[17]; 885 if (battery->design_capacity * battery->design_voltage / 1000 886 != dmi_capacity && 887 battery->design_capacity * 10 == dmi_capacity) 888 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, 889 &battery->flags); 890 } 891 } 892 893 /* 894 * According to the ACPI spec, some kinds of primary batteries can 895 * report percentage battery remaining capacity directly to OS. 896 * In this case, it reports the Last Full Charged Capacity == 100 897 * and BatteryPresentRate == 0xFFFFFFFF. 898 * 899 * Now we found some battery reports percentage remaining capacity 900 * even if it's rechargeable. 901 * https://bugzilla.kernel.org/show_bug.cgi?id=15979 902 * 903 * Handle this correctly so that they won't break userspace. 904 */ 905 static void acpi_battery_quirks(struct acpi_battery *battery) 906 { 907 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) 908 return; 909 910 if (battery->full_charge_capacity == 100 && 911 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN && 912 battery->capacity_now >= 0 && battery->capacity_now <= 100) { 913 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags); 914 battery->full_charge_capacity = battery->design_capacity; 915 battery->capacity_now = (battery->capacity_now * 916 battery->full_charge_capacity) / 100; 917 } 918 919 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags)) 920 return; 921 922 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) { 923 const char *s; 924 925 s = dmi_get_system_info(DMI_PRODUCT_VERSION); 926 if (s && !strncasecmp(s, "ThinkPad", 8)) { 927 dmi_walk(find_battery, battery); 928 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, 929 &battery->flags) && 930 battery->design_voltage) { 931 battery->design_capacity = 932 battery->design_capacity * 933 10000 / battery->design_voltage; 934 battery->full_charge_capacity = 935 battery->full_charge_capacity * 936 10000 / battery->design_voltage; 937 battery->design_capacity_warning = 938 battery->design_capacity_warning * 939 10000 / battery->design_voltage; 940 battery->capacity_now = battery->capacity_now * 941 10000 / battery->design_voltage; 942 } 943 } 944 } 945 946 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags)) 947 return; 948 949 if (acpi_battery_is_degraded(battery) && 950 battery->capacity_now > battery->full_charge_capacity) { 951 set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags); 952 battery->capacity_now = battery->full_charge_capacity; 953 } 954 } 955 956 static int acpi_battery_update(struct acpi_battery *battery, bool resume) 957 { 958 int result = acpi_battery_get_status(battery); 959 960 if (result) 961 return result; 962 963 if (!acpi_battery_present(battery)) { 964 sysfs_remove_battery(battery); 965 battery->update_time = 0; 966 return 0; 967 } 968 969 if (resume) 970 return 0; 971 972 if (!battery->update_time) { 973 result = acpi_battery_get_info(battery); 974 if (result) 975 return result; 976 acpi_battery_init_alarm(battery); 977 } 978 979 result = acpi_battery_get_state(battery); 980 if (result) 981 return result; 982 acpi_battery_quirks(battery); 983 984 if (!battery->bat) { 985 result = sysfs_add_battery(battery); 986 if (result) 987 return result; 988 } 989 990 /* 991 * Wakeup the system if battery is critical low 992 * or lower than the alarm level 993 */ 994 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) || 995 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) && 996 (battery->capacity_now <= battery->alarm))) 997 acpi_pm_wakeup_event(&battery->device->dev); 998 999 return result; 1000 } 1001 1002 static void acpi_battery_refresh(struct acpi_battery *battery) 1003 { 1004 int power_unit; 1005 1006 if (!battery->bat) 1007 return; 1008 1009 power_unit = battery->power_unit; 1010 1011 acpi_battery_get_info(battery); 1012 1013 if (power_unit == battery->power_unit) 1014 return; 1015 1016 /* The battery has changed its reporting units. */ 1017 sysfs_remove_battery(battery); 1018 sysfs_add_battery(battery); 1019 } 1020 1021 /* Driver Interface */ 1022 static void acpi_battery_notify(struct acpi_device *device, u32 event) 1023 { 1024 struct acpi_battery *battery = acpi_driver_data(device); 1025 struct power_supply *old; 1026 1027 if (!battery) 1028 return; 1029 old = battery->bat; 1030 /* 1031 * On Acer Aspire V5-573G notifications are sometimes triggered too 1032 * early. For example, when AC is unplugged and notification is 1033 * triggered, battery state is still reported as "Full", and changes to 1034 * "Discharging" only after short delay, without any notification. 1035 */ 1036 if (battery_notification_delay_ms > 0) 1037 msleep(battery_notification_delay_ms); 1038 if (event == ACPI_BATTERY_NOTIFY_INFO) 1039 acpi_battery_refresh(battery); 1040 acpi_battery_update(battery, false); 1041 acpi_bus_generate_netlink_event(device->pnp.device_class, 1042 dev_name(&device->dev), event, 1043 acpi_battery_present(battery)); 1044 acpi_notifier_call_chain(device, event, acpi_battery_present(battery)); 1045 /* acpi_battery_update could remove power_supply object */ 1046 if (old && battery->bat) 1047 power_supply_changed(battery->bat); 1048 } 1049 1050 static int battery_notify(struct notifier_block *nb, 1051 unsigned long mode, void *_unused) 1052 { 1053 struct acpi_battery *battery = container_of(nb, struct acpi_battery, 1054 pm_nb); 1055 int result; 1056 1057 switch (mode) { 1058 case PM_POST_HIBERNATION: 1059 case PM_POST_SUSPEND: 1060 if (!acpi_battery_present(battery)) 1061 return 0; 1062 1063 if (battery->bat) { 1064 acpi_battery_refresh(battery); 1065 } else { 1066 result = acpi_battery_get_info(battery); 1067 if (result) 1068 return result; 1069 1070 result = sysfs_add_battery(battery); 1071 if (result) 1072 return result; 1073 } 1074 1075 acpi_battery_init_alarm(battery); 1076 acpi_battery_get_state(battery); 1077 break; 1078 } 1079 1080 return 0; 1081 } 1082 1083 static int __init 1084 battery_bix_broken_package_quirk(const struct dmi_system_id *d) 1085 { 1086 battery_bix_broken_package = 1; 1087 return 0; 1088 } 1089 1090 static int __init 1091 battery_notification_delay_quirk(const struct dmi_system_id *d) 1092 { 1093 battery_notification_delay_ms = 1000; 1094 return 0; 1095 } 1096 1097 static int __init 1098 battery_ac_is_broken_quirk(const struct dmi_system_id *d) 1099 { 1100 battery_ac_is_broken = 1; 1101 return 0; 1102 } 1103 1104 static int __init battery_quirk_not_charging(const struct dmi_system_id *d) 1105 { 1106 battery_quirk_notcharging = 1; 1107 return 0; 1108 } 1109 1110 static const struct dmi_system_id bat_dmi_table[] __initconst = { 1111 { 1112 /* NEC LZ750/LS */ 1113 .callback = battery_bix_broken_package_quirk, 1114 .matches = { 1115 DMI_MATCH(DMI_SYS_VENDOR, "NEC"), 1116 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"), 1117 }, 1118 }, 1119 { 1120 /* Acer Aspire V5-573G */ 1121 .callback = battery_notification_delay_quirk, 1122 .matches = { 1123 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 1124 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"), 1125 }, 1126 }, 1127 { 1128 /* Point of View mobii wintab p800w */ 1129 .callback = battery_ac_is_broken_quirk, 1130 .matches = { 1131 DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"), 1132 DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"), 1133 DMI_MATCH(DMI_BIOS_VERSION, "3BAIR1013"), 1134 /* Above matches are too generic, add bios-date match */ 1135 DMI_MATCH(DMI_BIOS_DATE, "08/22/2014"), 1136 }, 1137 }, 1138 { 1139 /* 1140 * On Lenovo ThinkPads the BIOS specification defines 1141 * a state when the bits for charging and discharging 1142 * are both set to 0. That state is "Not Charging". 1143 */ 1144 .callback = battery_quirk_not_charging, 1145 .ident = "Lenovo ThinkPad", 1146 .matches = { 1147 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 1148 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad"), 1149 }, 1150 }, 1151 {}, 1152 }; 1153 1154 /* 1155 * Some machines'(E,G Lenovo Z480) ECs are not stable 1156 * during boot up and this causes battery driver fails to be 1157 * probed due to failure of getting battery information 1158 * from EC sometimes. After several retries, the operation 1159 * may work. So add retry code here and 20ms sleep between 1160 * every retries. 1161 */ 1162 static int acpi_battery_update_retry(struct acpi_battery *battery) 1163 { 1164 int retry, ret; 1165 1166 for (retry = 5; retry; retry--) { 1167 ret = acpi_battery_update(battery, false); 1168 if (!ret) 1169 break; 1170 1171 msleep(20); 1172 } 1173 return ret; 1174 } 1175 1176 static int acpi_battery_add(struct acpi_device *device) 1177 { 1178 int result = 0; 1179 struct acpi_battery *battery = NULL; 1180 1181 if (!device) 1182 return -EINVAL; 1183 1184 if (device->dep_unmet) 1185 return -EPROBE_DEFER; 1186 1187 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL); 1188 if (!battery) 1189 return -ENOMEM; 1190 battery->device = device; 1191 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME); 1192 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS); 1193 device->driver_data = battery; 1194 mutex_init(&battery->lock); 1195 mutex_init(&battery->sysfs_lock); 1196 if (acpi_has_method(battery->device->handle, "_BIX")) 1197 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags); 1198 1199 result = acpi_battery_update_retry(battery); 1200 if (result) 1201 goto fail; 1202 1203 pr_info("Slot [%s] (battery %s)\n", acpi_device_bid(device), 1204 device->status.battery_present ? "present" : "absent"); 1205 1206 battery->pm_nb.notifier_call = battery_notify; 1207 register_pm_notifier(&battery->pm_nb); 1208 1209 device_init_wakeup(&device->dev, 1); 1210 1211 return result; 1212 1213 fail: 1214 sysfs_remove_battery(battery); 1215 mutex_destroy(&battery->lock); 1216 mutex_destroy(&battery->sysfs_lock); 1217 kfree(battery); 1218 return result; 1219 } 1220 1221 static int acpi_battery_remove(struct acpi_device *device) 1222 { 1223 struct acpi_battery *battery = NULL; 1224 1225 if (!device || !acpi_driver_data(device)) 1226 return -EINVAL; 1227 device_init_wakeup(&device->dev, 0); 1228 battery = acpi_driver_data(device); 1229 unregister_pm_notifier(&battery->pm_nb); 1230 sysfs_remove_battery(battery); 1231 mutex_destroy(&battery->lock); 1232 mutex_destroy(&battery->sysfs_lock); 1233 kfree(battery); 1234 return 0; 1235 } 1236 1237 #ifdef CONFIG_PM_SLEEP 1238 /* this is needed to learn about changes made in suspended state */ 1239 static int acpi_battery_resume(struct device *dev) 1240 { 1241 struct acpi_battery *battery; 1242 1243 if (!dev) 1244 return -EINVAL; 1245 1246 battery = acpi_driver_data(to_acpi_device(dev)); 1247 if (!battery) 1248 return -EINVAL; 1249 1250 battery->update_time = 0; 1251 acpi_battery_update(battery, true); 1252 return 0; 1253 } 1254 #else 1255 #define acpi_battery_resume NULL 1256 #endif 1257 1258 static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume); 1259 1260 static struct acpi_driver acpi_battery_driver = { 1261 .name = "battery", 1262 .class = ACPI_BATTERY_CLASS, 1263 .ids = battery_device_ids, 1264 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS, 1265 .ops = { 1266 .add = acpi_battery_add, 1267 .remove = acpi_battery_remove, 1268 .notify = acpi_battery_notify, 1269 }, 1270 .drv.pm = &acpi_battery_pm, 1271 }; 1272 1273 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie) 1274 { 1275 int result; 1276 1277 if (acpi_quirk_skip_acpi_ac_and_battery()) 1278 return; 1279 1280 dmi_check_system(bat_dmi_table); 1281 1282 result = acpi_bus_register_driver(&acpi_battery_driver); 1283 battery_driver_registered = (result == 0); 1284 } 1285 1286 static int __init acpi_battery_init(void) 1287 { 1288 if (acpi_disabled) 1289 return -ENODEV; 1290 1291 async_cookie = async_schedule(acpi_battery_init_async, NULL); 1292 return 0; 1293 } 1294 1295 static void __exit acpi_battery_exit(void) 1296 { 1297 async_synchronize_cookie(async_cookie + 1); 1298 if (battery_driver_registered) { 1299 acpi_bus_unregister_driver(&acpi_battery_driver); 1300 battery_hook_exit(); 1301 } 1302 } 1303 1304 module_init(acpi_battery_init); 1305 module_exit(acpi_battery_exit); 1306