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) KBUILD_MODNAME ": " 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 PREFIX "ACPI: " 33 34 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF 35 #define ACPI_BATTERY_CAPACITY_VALID(capacity) \ 36 ((capacity) != 0 && (capacity) != ACPI_BATTERY_VALUE_UNKNOWN) 37 38 #define ACPI_BATTERY_DEVICE_NAME "Battery" 39 40 /* Battery power unit: 0 means mW, 1 means mA */ 41 #define ACPI_BATTERY_POWER_UNIT_MA 1 42 43 #define ACPI_BATTERY_STATE_DISCHARGING 0x1 44 #define ACPI_BATTERY_STATE_CHARGING 0x2 45 #define ACPI_BATTERY_STATE_CRITICAL 0x4 46 47 #define _COMPONENT ACPI_BATTERY_COMPONENT 48 49 ACPI_MODULE_NAME("battery"); 50 51 MODULE_AUTHOR("Paul Diefenbaugh"); 52 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>"); 53 MODULE_DESCRIPTION("ACPI Battery Driver"); 54 MODULE_LICENSE("GPL"); 55 56 static async_cookie_t async_cookie; 57 static bool battery_driver_registered; 58 static int battery_bix_broken_package; 59 static int battery_notification_delay_ms; 60 static int battery_ac_is_broken; 61 static int battery_check_pmic = 1; 62 static unsigned int cache_time = 1000; 63 module_param(cache_time, uint, 0644); 64 MODULE_PARM_DESC(cache_time, "cache time in milliseconds"); 65 66 static const struct acpi_device_id battery_device_ids[] = { 67 {"PNP0C0A", 0}, 68 {"", 0}, 69 }; 70 71 MODULE_DEVICE_TABLE(acpi, battery_device_ids); 72 73 /* Lists of PMIC ACPI HIDs with an (often better) native battery driver */ 74 static const char * const acpi_battery_blacklist[] = { 75 "INT33F4", /* X-Powers AXP288 PMIC */ 76 }; 77 78 enum { 79 ACPI_BATTERY_ALARM_PRESENT, 80 ACPI_BATTERY_XINFO_PRESENT, 81 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, 82 /* On Lenovo Thinkpad models from 2010 and 2011, the power unit 83 switches between mWh and mAh depending on whether the system 84 is running on battery or not. When mAh is the unit, most 85 reported values are incorrect and need to be adjusted by 86 10000/design_voltage. Verified on x201, t410, t410s, and x220. 87 Pre-2010 and 2012 models appear to always report in mWh and 88 are thus unaffected (tested with t42, t61, t500, x200, x300, 89 and x230). Also, in mid-2012 Lenovo issued a BIOS update for 90 the 2011 models that fixes the issue (tested on x220 with a 91 post-1.29 BIOS), but as of Nov. 2012, no such update is 92 available for the 2010 models. */ 93 ACPI_BATTERY_QUIRK_THINKPAD_MAH, 94 /* for batteries reporting current capacity with design capacity 95 * on a full charge, but showing degradation in full charge cap. 96 */ 97 ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, 98 }; 99 100 struct acpi_battery { 101 struct mutex lock; 102 struct mutex sysfs_lock; 103 struct power_supply *bat; 104 struct power_supply_desc bat_desc; 105 struct acpi_device *device; 106 struct notifier_block pm_nb; 107 struct list_head list; 108 unsigned long update_time; 109 int revision; 110 int rate_now; 111 int capacity_now; 112 int voltage_now; 113 int design_capacity; 114 int full_charge_capacity; 115 int technology; 116 int design_voltage; 117 int design_capacity_warning; 118 int design_capacity_low; 119 int cycle_count; 120 int measurement_accuracy; 121 int max_sampling_time; 122 int min_sampling_time; 123 int max_averaging_interval; 124 int min_averaging_interval; 125 int capacity_granularity_1; 126 int capacity_granularity_2; 127 int alarm; 128 char model_number[32]; 129 char serial_number[32]; 130 char type[32]; 131 char oem_info[32]; 132 int state; 133 int power_unit; 134 unsigned long flags; 135 }; 136 137 #define to_acpi_battery(x) power_supply_get_drvdata(x) 138 139 static inline int acpi_battery_present(struct acpi_battery *battery) 140 { 141 return battery->device->status.battery_present; 142 } 143 144 static int acpi_battery_technology(struct acpi_battery *battery) 145 { 146 if (!strcasecmp("NiCd", battery->type)) 147 return POWER_SUPPLY_TECHNOLOGY_NiCd; 148 if (!strcasecmp("NiMH", battery->type)) 149 return POWER_SUPPLY_TECHNOLOGY_NiMH; 150 if (!strcasecmp("LION", battery->type)) 151 return POWER_SUPPLY_TECHNOLOGY_LION; 152 if (!strncasecmp("LI-ION", battery->type, 6)) 153 return POWER_SUPPLY_TECHNOLOGY_LION; 154 if (!strcasecmp("LiP", battery->type)) 155 return POWER_SUPPLY_TECHNOLOGY_LIPO; 156 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN; 157 } 158 159 static int acpi_battery_get_state(struct acpi_battery *battery); 160 161 static int acpi_battery_is_charged(struct acpi_battery *battery) 162 { 163 /* charging, discharging or critical low */ 164 if (battery->state != 0) 165 return 0; 166 167 /* battery not reporting charge */ 168 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN || 169 battery->capacity_now == 0) 170 return 0; 171 172 /* good batteries update full_charge as the batteries degrade */ 173 if (battery->full_charge_capacity == battery->capacity_now) 174 return 1; 175 176 /* fallback to using design values for broken batteries */ 177 if (battery->design_capacity == battery->capacity_now) 178 return 1; 179 180 /* we don't do any sort of metric based on percentages */ 181 return 0; 182 } 183 184 static bool acpi_battery_is_degraded(struct acpi_battery *battery) 185 { 186 return ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) && 187 ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity) && 188 battery->full_charge_capacity < battery->design_capacity; 189 } 190 191 static int acpi_battery_handle_discharging(struct acpi_battery *battery) 192 { 193 /* 194 * Some devices wrongly report discharging if the battery's charge level 195 * was above the device's start charging threshold atm the AC adapter 196 * was plugged in and the device thus did not start a new charge cycle. 197 */ 198 if ((battery_ac_is_broken || power_supply_is_system_supplied()) && 199 battery->rate_now == 0) 200 return POWER_SUPPLY_STATUS_NOT_CHARGING; 201 202 return POWER_SUPPLY_STATUS_DISCHARGING; 203 } 204 205 static int acpi_battery_get_property(struct power_supply *psy, 206 enum power_supply_property psp, 207 union power_supply_propval *val) 208 { 209 int full_capacity = ACPI_BATTERY_VALUE_UNKNOWN, ret = 0; 210 struct acpi_battery *battery = to_acpi_battery(psy); 211 212 if (acpi_battery_present(battery)) { 213 /* run battery update only if it is present */ 214 acpi_battery_get_state(battery); 215 } else if (psp != POWER_SUPPLY_PROP_PRESENT) 216 return -ENODEV; 217 switch (psp) { 218 case POWER_SUPPLY_PROP_STATUS: 219 if (battery->state & ACPI_BATTERY_STATE_DISCHARGING) 220 val->intval = acpi_battery_handle_discharging(battery); 221 else if (battery->state & ACPI_BATTERY_STATE_CHARGING) 222 val->intval = POWER_SUPPLY_STATUS_CHARGING; 223 else if (acpi_battery_is_charged(battery)) 224 val->intval = POWER_SUPPLY_STATUS_FULL; 225 else 226 val->intval = POWER_SUPPLY_STATUS_UNKNOWN; 227 break; 228 case POWER_SUPPLY_PROP_PRESENT: 229 val->intval = acpi_battery_present(battery); 230 break; 231 case POWER_SUPPLY_PROP_TECHNOLOGY: 232 val->intval = acpi_battery_technology(battery); 233 break; 234 case POWER_SUPPLY_PROP_CYCLE_COUNT: 235 val->intval = battery->cycle_count; 236 break; 237 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: 238 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN) 239 ret = -ENODEV; 240 else 241 val->intval = battery->design_voltage * 1000; 242 break; 243 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 244 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN) 245 ret = -ENODEV; 246 else 247 val->intval = battery->voltage_now * 1000; 248 break; 249 case POWER_SUPPLY_PROP_CURRENT_NOW: 250 case POWER_SUPPLY_PROP_POWER_NOW: 251 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN) 252 ret = -ENODEV; 253 else 254 val->intval = battery->rate_now * 1000; 255 break; 256 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 257 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: 258 if (!ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) 259 ret = -ENODEV; 260 else 261 val->intval = battery->design_capacity * 1000; 262 break; 263 case POWER_SUPPLY_PROP_CHARGE_FULL: 264 case POWER_SUPPLY_PROP_ENERGY_FULL: 265 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity)) 266 ret = -ENODEV; 267 else 268 val->intval = battery->full_charge_capacity * 1000; 269 break; 270 case POWER_SUPPLY_PROP_CHARGE_NOW: 271 case POWER_SUPPLY_PROP_ENERGY_NOW: 272 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN) 273 ret = -ENODEV; 274 else 275 val->intval = battery->capacity_now * 1000; 276 break; 277 case POWER_SUPPLY_PROP_CAPACITY: 278 if (ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity)) 279 full_capacity = battery->full_charge_capacity; 280 else if (ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) 281 full_capacity = battery->design_capacity; 282 283 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN || 284 full_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 285 ret = -ENODEV; 286 else 287 val->intval = battery->capacity_now * 100/ 288 full_capacity; 289 break; 290 case POWER_SUPPLY_PROP_CAPACITY_LEVEL: 291 if (battery->state & ACPI_BATTERY_STATE_CRITICAL) 292 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL; 293 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) && 294 (battery->capacity_now <= battery->alarm)) 295 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW; 296 else if (acpi_battery_is_charged(battery)) 297 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL; 298 else 299 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; 300 break; 301 case POWER_SUPPLY_PROP_MODEL_NAME: 302 val->strval = battery->model_number; 303 break; 304 case POWER_SUPPLY_PROP_MANUFACTURER: 305 val->strval = battery->oem_info; 306 break; 307 case POWER_SUPPLY_PROP_SERIAL_NUMBER: 308 val->strval = battery->serial_number; 309 break; 310 default: 311 ret = -EINVAL; 312 } 313 return ret; 314 } 315 316 static enum power_supply_property charge_battery_props[] = { 317 POWER_SUPPLY_PROP_STATUS, 318 POWER_SUPPLY_PROP_PRESENT, 319 POWER_SUPPLY_PROP_TECHNOLOGY, 320 POWER_SUPPLY_PROP_CYCLE_COUNT, 321 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 322 POWER_SUPPLY_PROP_VOLTAGE_NOW, 323 POWER_SUPPLY_PROP_CURRENT_NOW, 324 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 325 POWER_SUPPLY_PROP_CHARGE_FULL, 326 POWER_SUPPLY_PROP_CHARGE_NOW, 327 POWER_SUPPLY_PROP_CAPACITY, 328 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 329 POWER_SUPPLY_PROP_MODEL_NAME, 330 POWER_SUPPLY_PROP_MANUFACTURER, 331 POWER_SUPPLY_PROP_SERIAL_NUMBER, 332 }; 333 334 static enum power_supply_property charge_battery_full_cap_broken_props[] = { 335 POWER_SUPPLY_PROP_STATUS, 336 POWER_SUPPLY_PROP_PRESENT, 337 POWER_SUPPLY_PROP_TECHNOLOGY, 338 POWER_SUPPLY_PROP_CYCLE_COUNT, 339 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 340 POWER_SUPPLY_PROP_VOLTAGE_NOW, 341 POWER_SUPPLY_PROP_CURRENT_NOW, 342 POWER_SUPPLY_PROP_CHARGE_NOW, 343 POWER_SUPPLY_PROP_MODEL_NAME, 344 POWER_SUPPLY_PROP_MANUFACTURER, 345 POWER_SUPPLY_PROP_SERIAL_NUMBER, 346 }; 347 348 static enum power_supply_property energy_battery_props[] = { 349 POWER_SUPPLY_PROP_STATUS, 350 POWER_SUPPLY_PROP_PRESENT, 351 POWER_SUPPLY_PROP_TECHNOLOGY, 352 POWER_SUPPLY_PROP_CYCLE_COUNT, 353 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 354 POWER_SUPPLY_PROP_VOLTAGE_NOW, 355 POWER_SUPPLY_PROP_POWER_NOW, 356 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 357 POWER_SUPPLY_PROP_ENERGY_FULL, 358 POWER_SUPPLY_PROP_ENERGY_NOW, 359 POWER_SUPPLY_PROP_CAPACITY, 360 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 361 POWER_SUPPLY_PROP_MODEL_NAME, 362 POWER_SUPPLY_PROP_MANUFACTURER, 363 POWER_SUPPLY_PROP_SERIAL_NUMBER, 364 }; 365 366 static enum power_supply_property energy_battery_full_cap_broken_props[] = { 367 POWER_SUPPLY_PROP_STATUS, 368 POWER_SUPPLY_PROP_PRESENT, 369 POWER_SUPPLY_PROP_TECHNOLOGY, 370 POWER_SUPPLY_PROP_CYCLE_COUNT, 371 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 372 POWER_SUPPLY_PROP_VOLTAGE_NOW, 373 POWER_SUPPLY_PROP_POWER_NOW, 374 POWER_SUPPLY_PROP_ENERGY_NOW, 375 POWER_SUPPLY_PROP_MODEL_NAME, 376 POWER_SUPPLY_PROP_MANUFACTURER, 377 POWER_SUPPLY_PROP_SERIAL_NUMBER, 378 }; 379 380 /* -------------------------------------------------------------------------- 381 Battery Management 382 -------------------------------------------------------------------------- */ 383 struct acpi_offsets { 384 size_t offset; /* offset inside struct acpi_sbs_battery */ 385 u8 mode; /* int or string? */ 386 }; 387 388 static const struct acpi_offsets state_offsets[] = { 389 {offsetof(struct acpi_battery, state), 0}, 390 {offsetof(struct acpi_battery, rate_now), 0}, 391 {offsetof(struct acpi_battery, capacity_now), 0}, 392 {offsetof(struct acpi_battery, voltage_now), 0}, 393 }; 394 395 static const struct acpi_offsets info_offsets[] = { 396 {offsetof(struct acpi_battery, power_unit), 0}, 397 {offsetof(struct acpi_battery, design_capacity), 0}, 398 {offsetof(struct acpi_battery, full_charge_capacity), 0}, 399 {offsetof(struct acpi_battery, technology), 0}, 400 {offsetof(struct acpi_battery, design_voltage), 0}, 401 {offsetof(struct acpi_battery, design_capacity_warning), 0}, 402 {offsetof(struct acpi_battery, design_capacity_low), 0}, 403 {offsetof(struct acpi_battery, capacity_granularity_1), 0}, 404 {offsetof(struct acpi_battery, capacity_granularity_2), 0}, 405 {offsetof(struct acpi_battery, model_number), 1}, 406 {offsetof(struct acpi_battery, serial_number), 1}, 407 {offsetof(struct acpi_battery, type), 1}, 408 {offsetof(struct acpi_battery, oem_info), 1}, 409 }; 410 411 static const struct acpi_offsets extended_info_offsets[] = { 412 {offsetof(struct acpi_battery, revision), 0}, 413 {offsetof(struct acpi_battery, power_unit), 0}, 414 {offsetof(struct acpi_battery, design_capacity), 0}, 415 {offsetof(struct acpi_battery, full_charge_capacity), 0}, 416 {offsetof(struct acpi_battery, technology), 0}, 417 {offsetof(struct acpi_battery, design_voltage), 0}, 418 {offsetof(struct acpi_battery, design_capacity_warning), 0}, 419 {offsetof(struct acpi_battery, design_capacity_low), 0}, 420 {offsetof(struct acpi_battery, cycle_count), 0}, 421 {offsetof(struct acpi_battery, measurement_accuracy), 0}, 422 {offsetof(struct acpi_battery, max_sampling_time), 0}, 423 {offsetof(struct acpi_battery, min_sampling_time), 0}, 424 {offsetof(struct acpi_battery, max_averaging_interval), 0}, 425 {offsetof(struct acpi_battery, min_averaging_interval), 0}, 426 {offsetof(struct acpi_battery, capacity_granularity_1), 0}, 427 {offsetof(struct acpi_battery, capacity_granularity_2), 0}, 428 {offsetof(struct acpi_battery, model_number), 1}, 429 {offsetof(struct acpi_battery, serial_number), 1}, 430 {offsetof(struct acpi_battery, type), 1}, 431 {offsetof(struct acpi_battery, oem_info), 1}, 432 }; 433 434 static int extract_package(struct acpi_battery *battery, 435 union acpi_object *package, 436 const struct acpi_offsets *offsets, int num) 437 { 438 int i; 439 union acpi_object *element; 440 if (package->type != ACPI_TYPE_PACKAGE) 441 return -EFAULT; 442 for (i = 0; i < num; ++i) { 443 if (package->package.count <= i) 444 return -EFAULT; 445 element = &package->package.elements[i]; 446 if (offsets[i].mode) { 447 u8 *ptr = (u8 *)battery + offsets[i].offset; 448 if (element->type == ACPI_TYPE_STRING || 449 element->type == ACPI_TYPE_BUFFER) 450 strncpy(ptr, element->string.pointer, 32); 451 else if (element->type == ACPI_TYPE_INTEGER) { 452 strncpy(ptr, (u8 *)&element->integer.value, 453 sizeof(u64)); 454 ptr[sizeof(u64)] = 0; 455 } else 456 *ptr = 0; /* don't have value */ 457 } else { 458 int *x = (int *)((u8 *)battery + offsets[i].offset); 459 *x = (element->type == ACPI_TYPE_INTEGER) ? 460 element->integer.value : -1; 461 } 462 } 463 return 0; 464 } 465 466 static int acpi_battery_get_status(struct acpi_battery *battery) 467 { 468 if (acpi_bus_get_status(battery->device)) { 469 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA")); 470 return -ENODEV; 471 } 472 return 0; 473 } 474 475 476 static int extract_battery_info(const int use_bix, 477 struct acpi_battery *battery, 478 const struct acpi_buffer *buffer) 479 { 480 int result = -EFAULT; 481 482 if (use_bix && battery_bix_broken_package) 483 result = extract_package(battery, buffer->pointer, 484 extended_info_offsets + 1, 485 ARRAY_SIZE(extended_info_offsets) - 1); 486 else if (use_bix) 487 result = extract_package(battery, buffer->pointer, 488 extended_info_offsets, 489 ARRAY_SIZE(extended_info_offsets)); 490 else 491 result = extract_package(battery, buffer->pointer, 492 info_offsets, ARRAY_SIZE(info_offsets)); 493 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) 494 battery->full_charge_capacity = battery->design_capacity; 495 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) && 496 battery->power_unit && battery->design_voltage) { 497 battery->design_capacity = battery->design_capacity * 498 10000 / battery->design_voltage; 499 battery->full_charge_capacity = battery->full_charge_capacity * 500 10000 / battery->design_voltage; 501 battery->design_capacity_warning = 502 battery->design_capacity_warning * 503 10000 / battery->design_voltage; 504 /* Curiously, design_capacity_low, unlike the rest of them, 505 is correct. */ 506 /* capacity_granularity_* equal 1 on the systems tested, so 507 it's impossible to tell if they would need an adjustment 508 or not if their values were higher. */ 509 } 510 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) && 511 battery->capacity_now > battery->full_charge_capacity) 512 battery->capacity_now = battery->full_charge_capacity; 513 514 return result; 515 } 516 517 static int acpi_battery_get_info(struct acpi_battery *battery) 518 { 519 const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags); 520 int use_bix; 521 int result = -ENODEV; 522 523 if (!acpi_battery_present(battery)) 524 return 0; 525 526 527 for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) { 528 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 529 acpi_status status = AE_ERROR; 530 531 mutex_lock(&battery->lock); 532 status = acpi_evaluate_object(battery->device->handle, 533 use_bix ? "_BIX":"_BIF", 534 NULL, &buffer); 535 mutex_unlock(&battery->lock); 536 537 if (ACPI_FAILURE(status)) { 538 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", 539 use_bix ? "_BIX":"_BIF")); 540 } else { 541 result = extract_battery_info(use_bix, 542 battery, 543 &buffer); 544 545 kfree(buffer.pointer); 546 break; 547 } 548 } 549 550 if (!result && !use_bix && xinfo) 551 pr_warn(FW_BUG "The _BIX method is broken, using _BIF.\n"); 552 553 return result; 554 } 555 556 static int acpi_battery_get_state(struct acpi_battery *battery) 557 { 558 int result = 0; 559 acpi_status status = 0; 560 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 561 562 if (!acpi_battery_present(battery)) 563 return 0; 564 565 if (battery->update_time && 566 time_before(jiffies, battery->update_time + 567 msecs_to_jiffies(cache_time))) 568 return 0; 569 570 mutex_lock(&battery->lock); 571 status = acpi_evaluate_object(battery->device->handle, "_BST", 572 NULL, &buffer); 573 mutex_unlock(&battery->lock); 574 575 if (ACPI_FAILURE(status)) { 576 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST")); 577 return -ENODEV; 578 } 579 580 result = extract_package(battery, buffer.pointer, 581 state_offsets, ARRAY_SIZE(state_offsets)); 582 battery->update_time = jiffies; 583 kfree(buffer.pointer); 584 585 /* For buggy DSDTs that report negative 16-bit values for either 586 * charging or discharging current and/or report 0 as 65536 587 * due to bad math. 588 */ 589 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA && 590 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN && 591 (s16)(battery->rate_now) < 0) { 592 battery->rate_now = abs((s16)battery->rate_now); 593 pr_warn_once(FW_BUG "battery: (dis)charge rate invalid.\n"); 594 } 595 596 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags) 597 && battery->capacity_now >= 0 && battery->capacity_now <= 100) 598 battery->capacity_now = (battery->capacity_now * 599 battery->full_charge_capacity) / 100; 600 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) && 601 battery->power_unit && battery->design_voltage) { 602 battery->capacity_now = battery->capacity_now * 603 10000 / battery->design_voltage; 604 } 605 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) && 606 battery->capacity_now > battery->full_charge_capacity) 607 battery->capacity_now = battery->full_charge_capacity; 608 609 return result; 610 } 611 612 static int acpi_battery_set_alarm(struct acpi_battery *battery) 613 { 614 acpi_status status = 0; 615 616 if (!acpi_battery_present(battery) || 617 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags)) 618 return -ENODEV; 619 620 mutex_lock(&battery->lock); 621 status = acpi_execute_simple_method(battery->device->handle, "_BTP", 622 battery->alarm); 623 mutex_unlock(&battery->lock); 624 625 if (ACPI_FAILURE(status)) 626 return -ENODEV; 627 628 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm)); 629 return 0; 630 } 631 632 static int acpi_battery_init_alarm(struct acpi_battery *battery) 633 { 634 /* See if alarms are supported, and if so, set default */ 635 if (!acpi_has_method(battery->device->handle, "_BTP")) { 636 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags); 637 return 0; 638 } 639 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags); 640 if (!battery->alarm) 641 battery->alarm = battery->design_capacity_warning; 642 return acpi_battery_set_alarm(battery); 643 } 644 645 static ssize_t acpi_battery_alarm_show(struct device *dev, 646 struct device_attribute *attr, 647 char *buf) 648 { 649 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 650 return sprintf(buf, "%d\n", battery->alarm * 1000); 651 } 652 653 static ssize_t acpi_battery_alarm_store(struct device *dev, 654 struct device_attribute *attr, 655 const char *buf, size_t count) 656 { 657 unsigned long x; 658 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 659 if (sscanf(buf, "%lu\n", &x) == 1) 660 battery->alarm = x/1000; 661 if (acpi_battery_present(battery)) 662 acpi_battery_set_alarm(battery); 663 return count; 664 } 665 666 static const struct device_attribute alarm_attr = { 667 .attr = {.name = "alarm", .mode = 0644}, 668 .show = acpi_battery_alarm_show, 669 .store = acpi_battery_alarm_store, 670 }; 671 672 /* 673 * The Battery Hooking API 674 * 675 * This API is used inside other drivers that need to expose 676 * platform-specific behaviour within the generic driver in a 677 * generic way. 678 * 679 */ 680 681 static LIST_HEAD(acpi_battery_list); 682 static LIST_HEAD(battery_hook_list); 683 static DEFINE_MUTEX(hook_mutex); 684 685 static void __battery_hook_unregister(struct acpi_battery_hook *hook, int lock) 686 { 687 struct acpi_battery *battery; 688 /* 689 * In order to remove a hook, we first need to 690 * de-register all the batteries that are registered. 691 */ 692 if (lock) 693 mutex_lock(&hook_mutex); 694 list_for_each_entry(battery, &acpi_battery_list, list) { 695 hook->remove_battery(battery->bat); 696 } 697 list_del(&hook->list); 698 if (lock) 699 mutex_unlock(&hook_mutex); 700 pr_info("extension unregistered: %s\n", hook->name); 701 } 702 703 void battery_hook_unregister(struct acpi_battery_hook *hook) 704 { 705 __battery_hook_unregister(hook, 1); 706 } 707 EXPORT_SYMBOL_GPL(battery_hook_unregister); 708 709 void battery_hook_register(struct acpi_battery_hook *hook) 710 { 711 struct acpi_battery *battery; 712 713 mutex_lock(&hook_mutex); 714 INIT_LIST_HEAD(&hook->list); 715 list_add(&hook->list, &battery_hook_list); 716 /* 717 * Now that the driver is registered, we need 718 * to notify the hook that a battery is available 719 * for each battery, so that the driver may add 720 * its attributes. 721 */ 722 list_for_each_entry(battery, &acpi_battery_list, list) { 723 if (hook->add_battery(battery->bat)) { 724 /* 725 * If a add-battery returns non-zero, 726 * the registration of the extension has failed, 727 * and we will not add it to the list of loaded 728 * hooks. 729 */ 730 pr_err("extension failed to load: %s", hook->name); 731 __battery_hook_unregister(hook, 0); 732 goto end; 733 } 734 } 735 pr_info("new extension: %s\n", hook->name); 736 end: 737 mutex_unlock(&hook_mutex); 738 } 739 EXPORT_SYMBOL_GPL(battery_hook_register); 740 741 /* 742 * This function gets called right after the battery sysfs 743 * attributes have been added, so that the drivers that 744 * define custom sysfs attributes can add their own. 745 */ 746 static void battery_hook_add_battery(struct acpi_battery *battery) 747 { 748 struct acpi_battery_hook *hook_node, *tmp; 749 750 mutex_lock(&hook_mutex); 751 INIT_LIST_HEAD(&battery->list); 752 list_add(&battery->list, &acpi_battery_list); 753 /* 754 * Since we added a new battery to the list, we need to 755 * iterate over the hooks and call add_battery for each 756 * hook that was registered. This usually happens 757 * when a battery gets hotplugged or initialized 758 * during the battery module initialization. 759 */ 760 list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) { 761 if (hook_node->add_battery(battery->bat)) { 762 /* 763 * The notification of the extensions has failed, to 764 * prevent further errors we will unload the extension. 765 */ 766 pr_err("error in extension, unloading: %s", 767 hook_node->name); 768 __battery_hook_unregister(hook_node, 0); 769 } 770 } 771 mutex_unlock(&hook_mutex); 772 } 773 774 static void battery_hook_remove_battery(struct acpi_battery *battery) 775 { 776 struct acpi_battery_hook *hook; 777 778 mutex_lock(&hook_mutex); 779 /* 780 * Before removing the hook, we need to remove all 781 * custom attributes from the battery. 782 */ 783 list_for_each_entry(hook, &battery_hook_list, list) { 784 hook->remove_battery(battery->bat); 785 } 786 /* Then, just remove the battery from the list */ 787 list_del(&battery->list); 788 mutex_unlock(&hook_mutex); 789 } 790 791 static void __exit battery_hook_exit(void) 792 { 793 struct acpi_battery_hook *hook; 794 struct acpi_battery_hook *ptr; 795 /* 796 * At this point, the acpi_bus_unregister_driver() 797 * has called remove for all batteries. We just 798 * need to remove the hooks. 799 */ 800 list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) { 801 __battery_hook_unregister(hook, 1); 802 } 803 mutex_destroy(&hook_mutex); 804 } 805 806 static int sysfs_add_battery(struct acpi_battery *battery) 807 { 808 struct power_supply_config psy_cfg = { .drv_data = battery, }; 809 bool full_cap_broken = false; 810 811 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) && 812 !ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) 813 full_cap_broken = true; 814 815 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) { 816 if (full_cap_broken) { 817 battery->bat_desc.properties = 818 charge_battery_full_cap_broken_props; 819 battery->bat_desc.num_properties = 820 ARRAY_SIZE(charge_battery_full_cap_broken_props); 821 } else { 822 battery->bat_desc.properties = charge_battery_props; 823 battery->bat_desc.num_properties = 824 ARRAY_SIZE(charge_battery_props); 825 } 826 } else { 827 if (full_cap_broken) { 828 battery->bat_desc.properties = 829 energy_battery_full_cap_broken_props; 830 battery->bat_desc.num_properties = 831 ARRAY_SIZE(energy_battery_full_cap_broken_props); 832 } else { 833 battery->bat_desc.properties = energy_battery_props; 834 battery->bat_desc.num_properties = 835 ARRAY_SIZE(energy_battery_props); 836 } 837 } 838 839 battery->bat_desc.name = acpi_device_bid(battery->device); 840 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY; 841 battery->bat_desc.get_property = acpi_battery_get_property; 842 843 battery->bat = power_supply_register_no_ws(&battery->device->dev, 844 &battery->bat_desc, &psy_cfg); 845 846 if (IS_ERR(battery->bat)) { 847 int result = PTR_ERR(battery->bat); 848 849 battery->bat = NULL; 850 return result; 851 } 852 battery_hook_add_battery(battery); 853 return device_create_file(&battery->bat->dev, &alarm_attr); 854 } 855 856 static void sysfs_remove_battery(struct acpi_battery *battery) 857 { 858 mutex_lock(&battery->sysfs_lock); 859 if (!battery->bat) { 860 mutex_unlock(&battery->sysfs_lock); 861 return; 862 } 863 battery_hook_remove_battery(battery); 864 device_remove_file(&battery->bat->dev, &alarm_attr); 865 power_supply_unregister(battery->bat); 866 battery->bat = NULL; 867 mutex_unlock(&battery->sysfs_lock); 868 } 869 870 static void find_battery(const struct dmi_header *dm, void *private) 871 { 872 struct acpi_battery *battery = (struct acpi_battery *)private; 873 /* Note: the hardcoded offsets below have been extracted from 874 the source code of dmidecode. */ 875 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) { 876 const u8 *dmi_data = (const u8 *)(dm + 1); 877 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6)); 878 if (dm->length >= 18) 879 dmi_capacity *= dmi_data[17]; 880 if (battery->design_capacity * battery->design_voltage / 1000 881 != dmi_capacity && 882 battery->design_capacity * 10 == dmi_capacity) 883 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, 884 &battery->flags); 885 } 886 } 887 888 /* 889 * According to the ACPI spec, some kinds of primary batteries can 890 * report percentage battery remaining capacity directly to OS. 891 * In this case, it reports the Last Full Charged Capacity == 100 892 * and BatteryPresentRate == 0xFFFFFFFF. 893 * 894 * Now we found some battery reports percentage remaining capacity 895 * even if it's rechargeable. 896 * https://bugzilla.kernel.org/show_bug.cgi?id=15979 897 * 898 * Handle this correctly so that they won't break userspace. 899 */ 900 static void acpi_battery_quirks(struct acpi_battery *battery) 901 { 902 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) 903 return; 904 905 if (battery->full_charge_capacity == 100 && 906 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN && 907 battery->capacity_now >= 0 && battery->capacity_now <= 100) { 908 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags); 909 battery->full_charge_capacity = battery->design_capacity; 910 battery->capacity_now = (battery->capacity_now * 911 battery->full_charge_capacity) / 100; 912 } 913 914 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags)) 915 return; 916 917 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) { 918 const char *s; 919 s = dmi_get_system_info(DMI_PRODUCT_VERSION); 920 if (s && !strncasecmp(s, "ThinkPad", 8)) { 921 dmi_walk(find_battery, battery); 922 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, 923 &battery->flags) && 924 battery->design_voltage) { 925 battery->design_capacity = 926 battery->design_capacity * 927 10000 / battery->design_voltage; 928 battery->full_charge_capacity = 929 battery->full_charge_capacity * 930 10000 / battery->design_voltage; 931 battery->design_capacity_warning = 932 battery->design_capacity_warning * 933 10000 / battery->design_voltage; 934 battery->capacity_now = battery->capacity_now * 935 10000 / battery->design_voltage; 936 } 937 } 938 } 939 940 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags)) 941 return; 942 943 if (acpi_battery_is_degraded(battery) && 944 battery->capacity_now > battery->full_charge_capacity) { 945 set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags); 946 battery->capacity_now = battery->full_charge_capacity; 947 } 948 } 949 950 static int acpi_battery_update(struct acpi_battery *battery, bool resume) 951 { 952 int result = acpi_battery_get_status(battery); 953 954 if (result) 955 return result; 956 957 if (!acpi_battery_present(battery)) { 958 sysfs_remove_battery(battery); 959 battery->update_time = 0; 960 return 0; 961 } 962 963 if (resume) 964 return 0; 965 966 if (!battery->update_time) { 967 result = acpi_battery_get_info(battery); 968 if (result) 969 return result; 970 acpi_battery_init_alarm(battery); 971 } 972 973 result = acpi_battery_get_state(battery); 974 if (result) 975 return result; 976 acpi_battery_quirks(battery); 977 978 if (!battery->bat) { 979 result = sysfs_add_battery(battery); 980 if (result) 981 return result; 982 } 983 984 /* 985 * Wakeup the system if battery is critical low 986 * or lower than the alarm level 987 */ 988 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) || 989 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) && 990 (battery->capacity_now <= battery->alarm))) 991 acpi_pm_wakeup_event(&battery->device->dev); 992 993 return result; 994 } 995 996 static void acpi_battery_refresh(struct acpi_battery *battery) 997 { 998 int power_unit; 999 1000 if (!battery->bat) 1001 return; 1002 1003 power_unit = battery->power_unit; 1004 1005 acpi_battery_get_info(battery); 1006 1007 if (power_unit == battery->power_unit) 1008 return; 1009 1010 /* The battery has changed its reporting units. */ 1011 sysfs_remove_battery(battery); 1012 sysfs_add_battery(battery); 1013 } 1014 1015 /* -------------------------------------------------------------------------- 1016 Driver Interface 1017 -------------------------------------------------------------------------- */ 1018 1019 static void acpi_battery_notify(struct acpi_device *device, u32 event) 1020 { 1021 struct acpi_battery *battery = acpi_driver_data(device); 1022 struct power_supply *old; 1023 1024 if (!battery) 1025 return; 1026 old = battery->bat; 1027 /* 1028 * On Acer Aspire V5-573G notifications are sometimes triggered too 1029 * early. For example, when AC is unplugged and notification is 1030 * triggered, battery state is still reported as "Full", and changes to 1031 * "Discharging" only after short delay, without any notification. 1032 */ 1033 if (battery_notification_delay_ms > 0) 1034 msleep(battery_notification_delay_ms); 1035 if (event == ACPI_BATTERY_NOTIFY_INFO) 1036 acpi_battery_refresh(battery); 1037 acpi_battery_update(battery, false); 1038 acpi_bus_generate_netlink_event(device->pnp.device_class, 1039 dev_name(&device->dev), event, 1040 acpi_battery_present(battery)); 1041 acpi_notifier_call_chain(device, event, acpi_battery_present(battery)); 1042 /* acpi_battery_update could remove power_supply object */ 1043 if (old && battery->bat) 1044 power_supply_changed(battery->bat); 1045 } 1046 1047 static int battery_notify(struct notifier_block *nb, 1048 unsigned long mode, void *_unused) 1049 { 1050 struct acpi_battery *battery = container_of(nb, struct acpi_battery, 1051 pm_nb); 1052 int result; 1053 1054 switch (mode) { 1055 case PM_POST_HIBERNATION: 1056 case PM_POST_SUSPEND: 1057 if (!acpi_battery_present(battery)) 1058 return 0; 1059 1060 if (battery->bat) { 1061 acpi_battery_refresh(battery); 1062 } else { 1063 result = acpi_battery_get_info(battery); 1064 if (result) 1065 return result; 1066 1067 result = sysfs_add_battery(battery); 1068 if (result) 1069 return result; 1070 } 1071 1072 acpi_battery_init_alarm(battery); 1073 acpi_battery_get_state(battery); 1074 break; 1075 } 1076 1077 return 0; 1078 } 1079 1080 static int __init 1081 battery_bix_broken_package_quirk(const struct dmi_system_id *d) 1082 { 1083 battery_bix_broken_package = 1; 1084 return 0; 1085 } 1086 1087 static int __init 1088 battery_notification_delay_quirk(const struct dmi_system_id *d) 1089 { 1090 battery_notification_delay_ms = 1000; 1091 return 0; 1092 } 1093 1094 static int __init 1095 battery_ac_is_broken_quirk(const struct dmi_system_id *d) 1096 { 1097 battery_ac_is_broken = 1; 1098 return 0; 1099 } 1100 1101 static int __init 1102 battery_do_not_check_pmic_quirk(const struct dmi_system_id *d) 1103 { 1104 battery_check_pmic = 0; 1105 return 0; 1106 } 1107 1108 static const struct dmi_system_id bat_dmi_table[] __initconst = { 1109 { 1110 /* NEC LZ750/LS */ 1111 .callback = battery_bix_broken_package_quirk, 1112 .matches = { 1113 DMI_MATCH(DMI_SYS_VENDOR, "NEC"), 1114 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"), 1115 }, 1116 }, 1117 { 1118 /* Acer Aspire V5-573G */ 1119 .callback = battery_notification_delay_quirk, 1120 .matches = { 1121 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 1122 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"), 1123 }, 1124 }, 1125 { 1126 /* Point of View mobii wintab p800w */ 1127 .callback = battery_ac_is_broken_quirk, 1128 .matches = { 1129 DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"), 1130 DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"), 1131 DMI_MATCH(DMI_BIOS_VERSION, "3BAIR1013"), 1132 /* Above matches are too generic, add bios-date match */ 1133 DMI_MATCH(DMI_BIOS_DATE, "08/22/2014"), 1134 }, 1135 }, 1136 { 1137 /* ECS EF20EA, AXP288 PMIC but uses separate fuel-gauge */ 1138 .callback = battery_do_not_check_pmic_quirk, 1139 .matches = { 1140 DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"), 1141 }, 1142 }, 1143 { 1144 /* Lenovo Ideapad Miix 320, AXP288 PMIC, separate fuel-gauge */ 1145 .callback = battery_do_not_check_pmic_quirk, 1146 .matches = { 1147 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 1148 DMI_MATCH(DMI_PRODUCT_NAME, "80XF"), 1149 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"), 1150 }, 1151 }, 1152 {}, 1153 }; 1154 1155 /* 1156 * Some machines'(E,G Lenovo Z480) ECs are not stable 1157 * during boot up and this causes battery driver fails to be 1158 * probed due to failure of getting battery information 1159 * from EC sometimes. After several retries, the operation 1160 * may work. So add retry code here and 20ms sleep between 1161 * every retries. 1162 */ 1163 static int acpi_battery_update_retry(struct acpi_battery *battery) 1164 { 1165 int retry, ret; 1166 1167 for (retry = 5; retry; retry--) { 1168 ret = acpi_battery_update(battery, false); 1169 if (!ret) 1170 break; 1171 1172 msleep(20); 1173 } 1174 return ret; 1175 } 1176 1177 static int acpi_battery_add(struct acpi_device *device) 1178 { 1179 int result = 0; 1180 struct acpi_battery *battery = NULL; 1181 1182 if (!device) 1183 return -EINVAL; 1184 1185 if (device->dep_unmet) 1186 return -EPROBE_DEFER; 1187 1188 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL); 1189 if (!battery) 1190 return -ENOMEM; 1191 battery->device = device; 1192 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME); 1193 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS); 1194 device->driver_data = battery; 1195 mutex_init(&battery->lock); 1196 mutex_init(&battery->sysfs_lock); 1197 if (acpi_has_method(battery->device->handle, "_BIX")) 1198 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags); 1199 1200 result = acpi_battery_update_retry(battery); 1201 if (result) 1202 goto fail; 1203 1204 pr_info(PREFIX "%s Slot [%s] (battery %s)\n", 1205 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device), 1206 device->status.battery_present ? "present" : "absent"); 1207 1208 battery->pm_nb.notifier_call = battery_notify; 1209 register_pm_notifier(&battery->pm_nb); 1210 1211 device_init_wakeup(&device->dev, 1); 1212 1213 return result; 1214 1215 fail: 1216 sysfs_remove_battery(battery); 1217 mutex_destroy(&battery->lock); 1218 mutex_destroy(&battery->sysfs_lock); 1219 kfree(battery); 1220 return result; 1221 } 1222 1223 static int acpi_battery_remove(struct acpi_device *device) 1224 { 1225 struct acpi_battery *battery = NULL; 1226 1227 if (!device || !acpi_driver_data(device)) 1228 return -EINVAL; 1229 device_init_wakeup(&device->dev, 0); 1230 battery = acpi_driver_data(device); 1231 unregister_pm_notifier(&battery->pm_nb); 1232 sysfs_remove_battery(battery); 1233 mutex_destroy(&battery->lock); 1234 mutex_destroy(&battery->sysfs_lock); 1235 kfree(battery); 1236 return 0; 1237 } 1238 1239 #ifdef CONFIG_PM_SLEEP 1240 /* this is needed to learn about changes made in suspended state */ 1241 static int acpi_battery_resume(struct device *dev) 1242 { 1243 struct acpi_battery *battery; 1244 1245 if (!dev) 1246 return -EINVAL; 1247 1248 battery = acpi_driver_data(to_acpi_device(dev)); 1249 if (!battery) 1250 return -EINVAL; 1251 1252 battery->update_time = 0; 1253 acpi_battery_update(battery, true); 1254 return 0; 1255 } 1256 #else 1257 #define acpi_battery_resume NULL 1258 #endif 1259 1260 static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume); 1261 1262 static struct acpi_driver acpi_battery_driver = { 1263 .name = "battery", 1264 .class = ACPI_BATTERY_CLASS, 1265 .ids = battery_device_ids, 1266 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS, 1267 .ops = { 1268 .add = acpi_battery_add, 1269 .remove = acpi_battery_remove, 1270 .notify = acpi_battery_notify, 1271 }, 1272 .drv.pm = &acpi_battery_pm, 1273 }; 1274 1275 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie) 1276 { 1277 unsigned int i; 1278 int result; 1279 1280 dmi_check_system(bat_dmi_table); 1281 1282 if (battery_check_pmic) { 1283 for (i = 0; i < ARRAY_SIZE(acpi_battery_blacklist); i++) 1284 if (acpi_dev_present(acpi_battery_blacklist[i], "1", -1)) { 1285 pr_info(PREFIX ACPI_BATTERY_DEVICE_NAME 1286 ": found native %s PMIC, not loading\n", 1287 acpi_battery_blacklist[i]); 1288 return; 1289 } 1290 } 1291 1292 result = acpi_bus_register_driver(&acpi_battery_driver); 1293 battery_driver_registered = (result == 0); 1294 } 1295 1296 static int __init acpi_battery_init(void) 1297 { 1298 if (acpi_disabled) 1299 return -ENODEV; 1300 1301 async_cookie = async_schedule(acpi_battery_init_async, NULL); 1302 return 0; 1303 } 1304 1305 static void __exit acpi_battery_exit(void) 1306 { 1307 async_synchronize_cookie(async_cookie + 1); 1308 if (battery_driver_registered) { 1309 acpi_bus_unregister_driver(&acpi_battery_driver); 1310 battery_hook_exit(); 1311 } 1312 } 1313 1314 module_init(acpi_battery_init); 1315 module_exit(acpi_battery_exit); 1316