1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * battery.c - ACPI Battery Driver (Revision: 2.0) 4 * 5 * Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de> 6 * Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com> 7 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 8 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 9 */ 10 11 #define pr_fmt(fmt) "ACPI: battery: " fmt 12 13 #include <linux/delay.h> 14 #include <linux/dmi.h> 15 #include <linux/jiffies.h> 16 #include <linux/kernel.h> 17 #include <linux/list.h> 18 #include <linux/module.h> 19 #include <linux/mutex.h> 20 #include <linux/slab.h> 21 #include <linux/suspend.h> 22 #include <linux/types.h> 23 24 #include <linux/unaligned.h> 25 26 #include <linux/acpi.h> 27 #include <linux/power_supply.h> 28 29 #include <acpi/battery.h> 30 31 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF 32 #define ACPI_BATTERY_CAPACITY_VALID(capacity) \ 33 ((capacity) != 0 && (capacity) != ACPI_BATTERY_VALUE_UNKNOWN) 34 35 #define ACPI_BATTERY_DEVICE_NAME "Battery" 36 37 /* Battery power unit: 0 means mW, 1 means mA */ 38 #define ACPI_BATTERY_POWER_UNIT_MA 1 39 40 #define ACPI_BATTERY_STATE_DISCHARGING 0x1 41 #define ACPI_BATTERY_STATE_CHARGING 0x2 42 #define ACPI_BATTERY_STATE_CRITICAL 0x4 43 #define ACPI_BATTERY_STATE_CHARGE_LIMITING 0x8 44 45 #define MAX_STRING_LENGTH 64 46 47 MODULE_AUTHOR("Paul Diefenbaugh"); 48 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>"); 49 MODULE_DESCRIPTION("ACPI Battery Driver"); 50 MODULE_LICENSE("GPL"); 51 52 static int battery_bix_broken_package; 53 static int battery_notification_delay_ms; 54 static int battery_ac_is_broken; 55 static unsigned int cache_time = 1000; 56 module_param(cache_time, uint, 0644); 57 MODULE_PARM_DESC(cache_time, "cache time in milliseconds"); 58 59 static const struct acpi_device_id battery_device_ids[] = { 60 {"PNP0C0A", 0}, 61 62 /* Microsoft Surface Go 3 */ 63 {"MSHW0146", 0}, 64 65 {"", 0}, 66 }; 67 68 MODULE_DEVICE_TABLE(acpi, battery_device_ids); 69 70 enum { 71 ACPI_BATTERY_ALARM_PRESENT, 72 ACPI_BATTERY_XINFO_PRESENT, 73 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, 74 /* On Lenovo Thinkpad models from 2010 and 2011, the power unit 75 * switches between mWh and mAh depending on whether the system 76 * is running on battery or not. When mAh is the unit, most 77 * reported values are incorrect and need to be adjusted by 78 * 10000/design_voltage. Verified on x201, t410, t410s, and x220. 79 * Pre-2010 and 2012 models appear to always report in mWh and 80 * are thus unaffected (tested with t42, t61, t500, x200, x300, 81 * and x230). Also, in mid-2012 Lenovo issued a BIOS update for 82 * the 2011 models that fixes the issue (tested on x220 with a 83 * post-1.29 BIOS), but as of Nov. 2012, no such update is 84 * available for the 2010 models. 85 */ 86 ACPI_BATTERY_QUIRK_THINKPAD_MAH, 87 /* for batteries reporting current capacity with design capacity 88 * on a full charge, but showing degradation in full charge cap. 89 */ 90 ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, 91 }; 92 93 struct acpi_battery { 94 struct mutex lock; 95 struct mutex sysfs_lock; 96 struct power_supply *bat; 97 struct power_supply_desc bat_desc; 98 struct acpi_device *device; 99 struct notifier_block pm_nb; 100 struct list_head list; 101 unsigned long update_time; 102 int revision; 103 int rate_now; 104 int capacity_now; 105 int voltage_now; 106 int design_capacity; 107 int full_charge_capacity; 108 int technology; 109 int design_voltage; 110 int design_capacity_warning; 111 int design_capacity_low; 112 int cycle_count; 113 int measurement_accuracy; 114 int max_sampling_time; 115 int min_sampling_time; 116 int max_averaging_interval; 117 int min_averaging_interval; 118 int capacity_granularity_1; 119 int capacity_granularity_2; 120 int alarm; 121 char model_number[MAX_STRING_LENGTH]; 122 char serial_number[MAX_STRING_LENGTH]; 123 char type[MAX_STRING_LENGTH]; 124 char oem_info[MAX_STRING_LENGTH]; 125 int state; 126 int power_unit; 127 unsigned long flags; 128 }; 129 130 #define to_acpi_battery(x) power_supply_get_drvdata(x) 131 132 static inline int acpi_battery_present(struct acpi_battery *battery) 133 { 134 return battery->device->status.battery_present; 135 } 136 137 static int acpi_battery_technology(struct acpi_battery *battery) 138 { 139 if (!strcasecmp("NiCd", battery->type)) 140 return POWER_SUPPLY_TECHNOLOGY_NiCd; 141 if (!strcasecmp("NiMH", battery->type)) 142 return POWER_SUPPLY_TECHNOLOGY_NiMH; 143 if (!strcasecmp("LION", battery->type)) 144 return POWER_SUPPLY_TECHNOLOGY_LION; 145 if (!strncasecmp("LI-ION", battery->type, 6)) 146 return POWER_SUPPLY_TECHNOLOGY_LION; 147 if (!strcasecmp("LiP", battery->type)) 148 return POWER_SUPPLY_TECHNOLOGY_LIPO; 149 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN; 150 } 151 152 static int acpi_battery_get_state(struct acpi_battery *battery); 153 154 static int acpi_battery_is_charged(struct acpi_battery *battery) 155 { 156 /* charging, discharging, critical low or charge limited */ 157 if (battery->state != 0) 158 return 0; 159 160 /* battery not reporting charge */ 161 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN || 162 battery->capacity_now == 0) 163 return 0; 164 165 /* good batteries update full_charge as the batteries degrade */ 166 if (battery->full_charge_capacity == battery->capacity_now) 167 return 1; 168 169 /* fallback to using design values for broken batteries */ 170 if (battery->design_capacity <= battery->capacity_now) 171 return 1; 172 173 /* we don't do any sort of metric based on percentages */ 174 return 0; 175 } 176 177 static bool acpi_battery_is_degraded(struct acpi_battery *battery) 178 { 179 return ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) && 180 ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity) && 181 battery->full_charge_capacity < battery->design_capacity; 182 } 183 184 static int acpi_battery_handle_discharging(struct acpi_battery *battery) 185 { 186 /* 187 * Some devices wrongly report discharging if the battery's charge level 188 * was above the device's start charging threshold atm the AC adapter 189 * was plugged in and the device thus did not start a new charge cycle. 190 */ 191 if ((battery_ac_is_broken || power_supply_is_system_supplied()) && 192 battery->rate_now == 0) 193 return POWER_SUPPLY_STATUS_NOT_CHARGING; 194 195 return POWER_SUPPLY_STATUS_DISCHARGING; 196 } 197 198 static int acpi_battery_get_property(struct power_supply *psy, 199 enum power_supply_property psp, 200 union power_supply_propval *val) 201 { 202 int full_capacity = ACPI_BATTERY_VALUE_UNKNOWN, ret = 0; 203 struct acpi_battery *battery = to_acpi_battery(psy); 204 205 if (acpi_battery_present(battery)) { 206 /* run battery update only if it is present */ 207 acpi_battery_get_state(battery); 208 } else if (psp != POWER_SUPPLY_PROP_PRESENT) 209 return -ENODEV; 210 switch (psp) { 211 case POWER_SUPPLY_PROP_STATUS: 212 if (battery->state & ACPI_BATTERY_STATE_DISCHARGING) 213 val->intval = acpi_battery_handle_discharging(battery); 214 else if (battery->state & ACPI_BATTERY_STATE_CHARGING) 215 val->intval = POWER_SUPPLY_STATUS_CHARGING; 216 else if (battery->state & ACPI_BATTERY_STATE_CHARGE_LIMITING) 217 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; 218 else if (acpi_battery_is_charged(battery)) 219 val->intval = POWER_SUPPLY_STATUS_FULL; 220 else 221 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; 222 break; 223 case POWER_SUPPLY_PROP_PRESENT: 224 val->intval = acpi_battery_present(battery); 225 break; 226 case POWER_SUPPLY_PROP_TECHNOLOGY: 227 val->intval = acpi_battery_technology(battery); 228 break; 229 case POWER_SUPPLY_PROP_CYCLE_COUNT: 230 val->intval = battery->cycle_count; 231 break; 232 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: 233 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN) 234 ret = -ENODEV; 235 else 236 val->intval = battery->design_voltage * 1000; 237 break; 238 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 239 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN) 240 ret = -ENODEV; 241 else 242 val->intval = battery->voltage_now * 1000; 243 break; 244 case POWER_SUPPLY_PROP_CURRENT_NOW: 245 case POWER_SUPPLY_PROP_POWER_NOW: 246 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN) { 247 ret = -ENODEV; 248 break; 249 } 250 251 val->intval = battery->rate_now * 1000; 252 /* 253 * When discharging, the current should be reported as a 254 * negative number as per the power supply class interface 255 * definition. 256 */ 257 if (psp == POWER_SUPPLY_PROP_CURRENT_NOW && 258 (battery->state & ACPI_BATTERY_STATE_DISCHARGING) && 259 acpi_battery_handle_discharging(battery) 260 == POWER_SUPPLY_STATUS_DISCHARGING) 261 val->intval = -val->intval; 262 263 break; 264 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 265 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: 266 if (!ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) 267 ret = -ENODEV; 268 else 269 val->intval = battery->design_capacity * 1000; 270 break; 271 case POWER_SUPPLY_PROP_CHARGE_FULL: 272 case POWER_SUPPLY_PROP_ENERGY_FULL: 273 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity)) 274 ret = -ENODEV; 275 else 276 val->intval = battery->full_charge_capacity * 1000; 277 break; 278 case POWER_SUPPLY_PROP_CHARGE_NOW: 279 case POWER_SUPPLY_PROP_ENERGY_NOW: 280 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN) 281 ret = -ENODEV; 282 else 283 val->intval = battery->capacity_now * 1000; 284 break; 285 case POWER_SUPPLY_PROP_CAPACITY: 286 if (ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity)) 287 full_capacity = battery->full_charge_capacity; 288 else if (ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) 289 full_capacity = battery->design_capacity; 290 291 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN || 292 full_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 293 ret = -ENODEV; 294 else 295 val->intval = DIV_ROUND_CLOSEST_ULL(battery->capacity_now * 100ULL, 296 full_capacity); 297 break; 298 case POWER_SUPPLY_PROP_CAPACITY_LEVEL: 299 if (battery->state & ACPI_BATTERY_STATE_CRITICAL) 300 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL; 301 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) && 302 (battery->capacity_now <= battery->alarm)) 303 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW; 304 else if (acpi_battery_is_charged(battery)) 305 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL; 306 else 307 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; 308 break; 309 case POWER_SUPPLY_PROP_MODEL_NAME: 310 val->strval = battery->model_number; 311 break; 312 case POWER_SUPPLY_PROP_MANUFACTURER: 313 val->strval = battery->oem_info; 314 break; 315 case POWER_SUPPLY_PROP_SERIAL_NUMBER: 316 val->strval = battery->serial_number; 317 break; 318 default: 319 ret = -EINVAL; 320 } 321 return ret; 322 } 323 324 static const enum power_supply_property charge_battery_props[] = { 325 POWER_SUPPLY_PROP_STATUS, 326 POWER_SUPPLY_PROP_PRESENT, 327 POWER_SUPPLY_PROP_TECHNOLOGY, 328 POWER_SUPPLY_PROP_CYCLE_COUNT, 329 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 330 POWER_SUPPLY_PROP_VOLTAGE_NOW, 331 POWER_SUPPLY_PROP_CURRENT_NOW, 332 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 333 POWER_SUPPLY_PROP_CHARGE_FULL, 334 POWER_SUPPLY_PROP_CHARGE_NOW, 335 POWER_SUPPLY_PROP_CAPACITY, 336 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 337 POWER_SUPPLY_PROP_MODEL_NAME, 338 POWER_SUPPLY_PROP_MANUFACTURER, 339 POWER_SUPPLY_PROP_SERIAL_NUMBER, 340 }; 341 342 static const enum power_supply_property charge_battery_full_cap_broken_props[] = { 343 POWER_SUPPLY_PROP_STATUS, 344 POWER_SUPPLY_PROP_PRESENT, 345 POWER_SUPPLY_PROP_TECHNOLOGY, 346 POWER_SUPPLY_PROP_CYCLE_COUNT, 347 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 348 POWER_SUPPLY_PROP_VOLTAGE_NOW, 349 POWER_SUPPLY_PROP_CURRENT_NOW, 350 POWER_SUPPLY_PROP_CHARGE_NOW, 351 POWER_SUPPLY_PROP_MODEL_NAME, 352 POWER_SUPPLY_PROP_MANUFACTURER, 353 POWER_SUPPLY_PROP_SERIAL_NUMBER, 354 }; 355 356 static const enum power_supply_property energy_battery_props[] = { 357 POWER_SUPPLY_PROP_STATUS, 358 POWER_SUPPLY_PROP_PRESENT, 359 POWER_SUPPLY_PROP_TECHNOLOGY, 360 POWER_SUPPLY_PROP_CYCLE_COUNT, 361 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 362 POWER_SUPPLY_PROP_VOLTAGE_NOW, 363 POWER_SUPPLY_PROP_POWER_NOW, 364 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 365 POWER_SUPPLY_PROP_ENERGY_FULL, 366 POWER_SUPPLY_PROP_ENERGY_NOW, 367 POWER_SUPPLY_PROP_CAPACITY, 368 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 369 POWER_SUPPLY_PROP_MODEL_NAME, 370 POWER_SUPPLY_PROP_MANUFACTURER, 371 POWER_SUPPLY_PROP_SERIAL_NUMBER, 372 }; 373 374 static const enum power_supply_property energy_battery_full_cap_broken_props[] = { 375 POWER_SUPPLY_PROP_STATUS, 376 POWER_SUPPLY_PROP_PRESENT, 377 POWER_SUPPLY_PROP_TECHNOLOGY, 378 POWER_SUPPLY_PROP_CYCLE_COUNT, 379 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 380 POWER_SUPPLY_PROP_VOLTAGE_NOW, 381 POWER_SUPPLY_PROP_POWER_NOW, 382 POWER_SUPPLY_PROP_ENERGY_NOW, 383 POWER_SUPPLY_PROP_MODEL_NAME, 384 POWER_SUPPLY_PROP_MANUFACTURER, 385 POWER_SUPPLY_PROP_SERIAL_NUMBER, 386 }; 387 388 /* Battery Management */ 389 struct acpi_offsets { 390 size_t offset; /* offset inside struct acpi_sbs_battery */ 391 u8 mode; /* int or string? */ 392 }; 393 394 static const struct acpi_offsets state_offsets[] = { 395 {offsetof(struct acpi_battery, state), 0}, 396 {offsetof(struct acpi_battery, rate_now), 0}, 397 {offsetof(struct acpi_battery, capacity_now), 0}, 398 {offsetof(struct acpi_battery, voltage_now), 0}, 399 }; 400 401 static const struct acpi_offsets info_offsets[] = { 402 {offsetof(struct acpi_battery, power_unit), 0}, 403 {offsetof(struct acpi_battery, design_capacity), 0}, 404 {offsetof(struct acpi_battery, full_charge_capacity), 0}, 405 {offsetof(struct acpi_battery, technology), 0}, 406 {offsetof(struct acpi_battery, design_voltage), 0}, 407 {offsetof(struct acpi_battery, design_capacity_warning), 0}, 408 {offsetof(struct acpi_battery, design_capacity_low), 0}, 409 {offsetof(struct acpi_battery, capacity_granularity_1), 0}, 410 {offsetof(struct acpi_battery, capacity_granularity_2), 0}, 411 {offsetof(struct acpi_battery, model_number), 1}, 412 {offsetof(struct acpi_battery, serial_number), 1}, 413 {offsetof(struct acpi_battery, type), 1}, 414 {offsetof(struct acpi_battery, oem_info), 1}, 415 }; 416 417 static const struct acpi_offsets extended_info_offsets[] = { 418 {offsetof(struct acpi_battery, revision), 0}, 419 {offsetof(struct acpi_battery, power_unit), 0}, 420 {offsetof(struct acpi_battery, design_capacity), 0}, 421 {offsetof(struct acpi_battery, full_charge_capacity), 0}, 422 {offsetof(struct acpi_battery, technology), 0}, 423 {offsetof(struct acpi_battery, design_voltage), 0}, 424 {offsetof(struct acpi_battery, design_capacity_warning), 0}, 425 {offsetof(struct acpi_battery, design_capacity_low), 0}, 426 {offsetof(struct acpi_battery, cycle_count), 0}, 427 {offsetof(struct acpi_battery, measurement_accuracy), 0}, 428 {offsetof(struct acpi_battery, max_sampling_time), 0}, 429 {offsetof(struct acpi_battery, min_sampling_time), 0}, 430 {offsetof(struct acpi_battery, max_averaging_interval), 0}, 431 {offsetof(struct acpi_battery, min_averaging_interval), 0}, 432 {offsetof(struct acpi_battery, capacity_granularity_1), 0}, 433 {offsetof(struct acpi_battery, capacity_granularity_2), 0}, 434 {offsetof(struct acpi_battery, model_number), 1}, 435 {offsetof(struct acpi_battery, serial_number), 1}, 436 {offsetof(struct acpi_battery, type), 1}, 437 {offsetof(struct acpi_battery, oem_info), 1}, 438 }; 439 440 static int extract_package(struct acpi_battery *battery, 441 union acpi_object *package, 442 const struct acpi_offsets *offsets, int num) 443 { 444 int i; 445 union acpi_object *element; 446 447 if (package->type != ACPI_TYPE_PACKAGE) 448 return -EFAULT; 449 for (i = 0; i < num; ++i) { 450 if (package->package.count <= i) 451 return -EFAULT; 452 element = &package->package.elements[i]; 453 if (offsets[i].mode) { 454 u8 *ptr = (u8 *)battery + offsets[i].offset; 455 u32 len = MAX_STRING_LENGTH; 456 457 switch (element->type) { 458 case ACPI_TYPE_BUFFER: 459 if (len > element->buffer.length + 1) 460 len = element->buffer.length + 1; 461 462 fallthrough; 463 case ACPI_TYPE_STRING: 464 strscpy(ptr, element->string.pointer, len); 465 466 break; 467 case ACPI_TYPE_INTEGER: 468 strscpy(ptr, (u8 *)&element->integer.value, sizeof(u64) + 1); 469 470 break; 471 default: 472 *ptr = 0; /* don't have value */ 473 } 474 } else { 475 int *x = (int *)((u8 *)battery + offsets[i].offset); 476 *x = (element->type == ACPI_TYPE_INTEGER) ? 477 element->integer.value : -1; 478 } 479 } 480 return 0; 481 } 482 483 static int acpi_battery_get_status(struct acpi_battery *battery) 484 { 485 if (acpi_bus_get_status(battery->device)) { 486 acpi_handle_info(battery->device->handle, 487 "_STA evaluation failed\n"); 488 return -ENODEV; 489 } 490 return 0; 491 } 492 493 494 static int extract_battery_info(const int use_bix, 495 struct acpi_battery *battery, 496 const struct acpi_buffer *buffer) 497 { 498 int result = -EFAULT; 499 500 if (use_bix && battery_bix_broken_package) 501 result = extract_package(battery, buffer->pointer, 502 extended_info_offsets + 1, 503 ARRAY_SIZE(extended_info_offsets) - 1); 504 else if (use_bix) 505 result = extract_package(battery, buffer->pointer, 506 extended_info_offsets, 507 ARRAY_SIZE(extended_info_offsets)); 508 else 509 result = extract_package(battery, buffer->pointer, 510 info_offsets, ARRAY_SIZE(info_offsets)); 511 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) 512 battery->full_charge_capacity = battery->design_capacity; 513 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) && 514 battery->power_unit && battery->design_voltage) { 515 battery->design_capacity = battery->design_capacity * 516 10000 / battery->design_voltage; 517 battery->full_charge_capacity = battery->full_charge_capacity * 518 10000 / battery->design_voltage; 519 battery->design_capacity_warning = 520 battery->design_capacity_warning * 521 10000 / battery->design_voltage; 522 /* Curiously, design_capacity_low, unlike the rest of them, 523 * is correct. 524 */ 525 /* capacity_granularity_* equal 1 on the systems tested, so 526 * it's impossible to tell if they would need an adjustment 527 * or not if their values were higher. 528 */ 529 } 530 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) && 531 battery->capacity_now > battery->full_charge_capacity) 532 battery->capacity_now = battery->full_charge_capacity; 533 534 return result; 535 } 536 537 static int acpi_battery_get_info(struct acpi_battery *battery) 538 { 539 const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags); 540 int use_bix; 541 int result = -ENODEV; 542 543 if (!acpi_battery_present(battery)) 544 return 0; 545 546 547 for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) { 548 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 549 acpi_status status = AE_ERROR; 550 551 mutex_lock(&battery->lock); 552 status = acpi_evaluate_object(battery->device->handle, 553 use_bix ? "_BIX":"_BIF", 554 NULL, &buffer); 555 mutex_unlock(&battery->lock); 556 557 if (ACPI_FAILURE(status)) { 558 acpi_handle_info(battery->device->handle, 559 "%s evaluation failed: %s\n", 560 use_bix ? "_BIX":"_BIF", 561 acpi_format_exception(status)); 562 } else { 563 result = extract_battery_info(use_bix, 564 battery, 565 &buffer); 566 567 kfree(buffer.pointer); 568 break; 569 } 570 } 571 572 if (!result && !use_bix && xinfo) 573 pr_warn(FW_BUG "The _BIX method is broken, using _BIF.\n"); 574 575 return result; 576 } 577 578 static int acpi_battery_get_state(struct acpi_battery *battery) 579 { 580 int result = 0; 581 acpi_status status = 0; 582 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 583 584 if (!acpi_battery_present(battery)) 585 return 0; 586 587 if (battery->update_time && 588 time_before(jiffies, battery->update_time + 589 msecs_to_jiffies(cache_time))) 590 return 0; 591 592 mutex_lock(&battery->lock); 593 status = acpi_evaluate_object(battery->device->handle, "_BST", 594 NULL, &buffer); 595 mutex_unlock(&battery->lock); 596 597 if (ACPI_FAILURE(status)) { 598 acpi_handle_info(battery->device->handle, 599 "_BST evaluation failed: %s", 600 acpi_format_exception(status)); 601 return -ENODEV; 602 } 603 604 result = extract_package(battery, buffer.pointer, 605 state_offsets, ARRAY_SIZE(state_offsets)); 606 battery->update_time = jiffies; 607 kfree(buffer.pointer); 608 609 /* For buggy DSDTs that report negative 16-bit values for either 610 * charging or discharging current and/or report 0 as 65536 611 * due to bad math. 612 */ 613 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA && 614 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN && 615 (s16)(battery->rate_now) < 0) { 616 battery->rate_now = abs((s16)battery->rate_now); 617 pr_warn_once(FW_BUG "(dis)charge rate invalid.\n"); 618 } 619 620 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags) 621 && battery->capacity_now >= 0 && battery->capacity_now <= 100) 622 battery->capacity_now = (battery->capacity_now * 623 battery->full_charge_capacity) / 100; 624 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) && 625 battery->power_unit && battery->design_voltage) { 626 battery->capacity_now = battery->capacity_now * 627 10000 / battery->design_voltage; 628 } 629 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) && 630 battery->capacity_now > battery->full_charge_capacity) 631 battery->capacity_now = battery->full_charge_capacity; 632 633 return result; 634 } 635 636 static int acpi_battery_set_alarm(struct acpi_battery *battery) 637 { 638 acpi_status status = 0; 639 640 if (!acpi_battery_present(battery) || 641 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags)) 642 return -ENODEV; 643 644 mutex_lock(&battery->lock); 645 status = acpi_execute_simple_method(battery->device->handle, "_BTP", 646 battery->alarm); 647 mutex_unlock(&battery->lock); 648 649 if (ACPI_FAILURE(status)) 650 return -ENODEV; 651 652 acpi_handle_debug(battery->device->handle, "Alarm set to %d\n", 653 battery->alarm); 654 655 return 0; 656 } 657 658 static int acpi_battery_init_alarm(struct acpi_battery *battery) 659 { 660 /* See if alarms are supported, and if so, set default */ 661 if (!acpi_has_method(battery->device->handle, "_BTP")) { 662 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags); 663 return 0; 664 } 665 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags); 666 if (!battery->alarm) 667 battery->alarm = battery->design_capacity_warning; 668 return acpi_battery_set_alarm(battery); 669 } 670 671 static ssize_t acpi_battery_alarm_show(struct device *dev, 672 struct device_attribute *attr, 673 char *buf) 674 { 675 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 676 677 return sysfs_emit(buf, "%d\n", battery->alarm * 1000); 678 } 679 680 static ssize_t acpi_battery_alarm_store(struct device *dev, 681 struct device_attribute *attr, 682 const char *buf, size_t count) 683 { 684 unsigned long x; 685 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 686 687 if (sscanf(buf, "%lu\n", &x) == 1) 688 battery->alarm = x/1000; 689 if (acpi_battery_present(battery)) 690 acpi_battery_set_alarm(battery); 691 return count; 692 } 693 694 static struct device_attribute alarm_attr = { 695 .attr = {.name = "alarm", .mode = 0644}, 696 .show = acpi_battery_alarm_show, 697 .store = acpi_battery_alarm_store, 698 }; 699 700 static struct attribute *acpi_battery_attrs[] = { 701 &alarm_attr.attr, 702 NULL 703 }; 704 ATTRIBUTE_GROUPS(acpi_battery); 705 706 /* 707 * The Battery Hooking API 708 * 709 * This API is used inside other drivers that need to expose 710 * platform-specific behaviour within the generic driver in a 711 * generic way. 712 * 713 */ 714 715 static LIST_HEAD(acpi_battery_list); 716 static LIST_HEAD(battery_hook_list); 717 static DEFINE_MUTEX(hook_mutex); 718 719 static void battery_hook_unregister_unlocked(struct acpi_battery_hook *hook) 720 { 721 struct acpi_battery *battery; 722 723 /* 724 * In order to remove a hook, we first need to 725 * de-register all the batteries that are registered. 726 */ 727 list_for_each_entry(battery, &acpi_battery_list, list) { 728 if (!hook->remove_battery(battery->bat, hook)) 729 power_supply_changed(battery->bat); 730 } 731 list_del_init(&hook->list); 732 733 pr_info("hook unregistered: %s\n", hook->name); 734 } 735 736 void battery_hook_unregister(struct acpi_battery_hook *hook) 737 { 738 mutex_lock(&hook_mutex); 739 /* 740 * Ignore already unregistered battery hooks. This might happen 741 * if a battery hook was previously unloaded due to an error when 742 * adding a new battery. 743 */ 744 if (!list_empty(&hook->list)) 745 battery_hook_unregister_unlocked(hook); 746 747 mutex_unlock(&hook_mutex); 748 } 749 EXPORT_SYMBOL_GPL(battery_hook_unregister); 750 751 void battery_hook_register(struct acpi_battery_hook *hook) 752 { 753 struct acpi_battery *battery; 754 755 mutex_lock(&hook_mutex); 756 list_add(&hook->list, &battery_hook_list); 757 /* 758 * Now that the driver is registered, we need 759 * to notify the hook that a battery is available 760 * for each battery, so that the driver may add 761 * its attributes. 762 */ 763 list_for_each_entry(battery, &acpi_battery_list, list) { 764 if (hook->add_battery(battery->bat, hook)) { 765 /* 766 * If a add-battery returns non-zero, 767 * the registration of the hook has failed, 768 * and we will not add it to the list of loaded 769 * hooks. 770 */ 771 pr_err("hook failed to load: %s", hook->name); 772 battery_hook_unregister_unlocked(hook); 773 goto end; 774 } 775 776 power_supply_changed(battery->bat); 777 } 778 pr_info("new hook: %s\n", hook->name); 779 end: 780 mutex_unlock(&hook_mutex); 781 } 782 EXPORT_SYMBOL_GPL(battery_hook_register); 783 784 static void devm_battery_hook_unregister(void *data) 785 { 786 struct acpi_battery_hook *hook = data; 787 788 battery_hook_unregister(hook); 789 } 790 791 int devm_battery_hook_register(struct device *dev, struct acpi_battery_hook *hook) 792 { 793 battery_hook_register(hook); 794 795 return devm_add_action_or_reset(dev, devm_battery_hook_unregister, hook); 796 } 797 EXPORT_SYMBOL_GPL(devm_battery_hook_register); 798 799 /* 800 * This function gets called right after the battery sysfs 801 * attributes have been added, so that the drivers that 802 * define custom sysfs attributes can add their own. 803 */ 804 static void battery_hook_add_battery(struct acpi_battery *battery) 805 { 806 struct acpi_battery_hook *hook_node, *tmp; 807 808 mutex_lock(&hook_mutex); 809 INIT_LIST_HEAD(&battery->list); 810 list_add(&battery->list, &acpi_battery_list); 811 /* 812 * Since we added a new battery to the list, we need to 813 * iterate over the hooks and call add_battery for each 814 * hook that was registered. This usually happens 815 * when a battery gets hotplugged or initialized 816 * during the battery module initialization. 817 */ 818 list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) { 819 if (hook_node->add_battery(battery->bat, hook_node)) { 820 /* 821 * The notification of the hook has failed, to 822 * prevent further errors we will unload the hook. 823 */ 824 pr_err("error in hook, unloading: %s", 825 hook_node->name); 826 battery_hook_unregister_unlocked(hook_node); 827 } 828 } 829 mutex_unlock(&hook_mutex); 830 } 831 832 static void battery_hook_remove_battery(struct acpi_battery *battery) 833 { 834 struct acpi_battery_hook *hook; 835 836 mutex_lock(&hook_mutex); 837 /* 838 * Before removing the hook, we need to remove all 839 * custom attributes from the battery. 840 */ 841 list_for_each_entry(hook, &battery_hook_list, list) { 842 hook->remove_battery(battery->bat, hook); 843 } 844 /* Then, just remove the battery from the list */ 845 list_del(&battery->list); 846 mutex_unlock(&hook_mutex); 847 } 848 849 static void __exit battery_hook_exit(void) 850 { 851 struct acpi_battery_hook *hook; 852 struct acpi_battery_hook *ptr; 853 /* 854 * At this point, the acpi_bus_unregister_driver() 855 * has called remove for all batteries. We just 856 * need to remove the hooks. 857 */ 858 list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) { 859 battery_hook_unregister(hook); 860 } 861 mutex_destroy(&hook_mutex); 862 } 863 864 static int sysfs_add_battery(struct acpi_battery *battery) 865 { 866 struct power_supply_config psy_cfg = { 867 .drv_data = battery, 868 .attr_grp = acpi_battery_groups, 869 .no_wakeup_source = true, 870 }; 871 bool full_cap_broken = false; 872 873 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) && 874 !ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) 875 full_cap_broken = true; 876 877 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) { 878 if (full_cap_broken) { 879 battery->bat_desc.properties = 880 charge_battery_full_cap_broken_props; 881 battery->bat_desc.num_properties = 882 ARRAY_SIZE(charge_battery_full_cap_broken_props); 883 } else { 884 battery->bat_desc.properties = charge_battery_props; 885 battery->bat_desc.num_properties = 886 ARRAY_SIZE(charge_battery_props); 887 } 888 } else { 889 if (full_cap_broken) { 890 battery->bat_desc.properties = 891 energy_battery_full_cap_broken_props; 892 battery->bat_desc.num_properties = 893 ARRAY_SIZE(energy_battery_full_cap_broken_props); 894 } else { 895 battery->bat_desc.properties = energy_battery_props; 896 battery->bat_desc.num_properties = 897 ARRAY_SIZE(energy_battery_props); 898 } 899 } 900 901 battery->bat_desc.name = acpi_device_bid(battery->device); 902 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY; 903 battery->bat_desc.get_property = acpi_battery_get_property; 904 905 battery->bat = power_supply_register(&battery->device->dev, 906 &battery->bat_desc, &psy_cfg); 907 908 if (IS_ERR(battery->bat)) { 909 int result = PTR_ERR(battery->bat); 910 911 battery->bat = NULL; 912 return result; 913 } 914 battery_hook_add_battery(battery); 915 return 0; 916 } 917 918 static void sysfs_remove_battery(struct acpi_battery *battery) 919 { 920 mutex_lock(&battery->sysfs_lock); 921 if (!battery->bat) { 922 mutex_unlock(&battery->sysfs_lock); 923 return; 924 } 925 battery_hook_remove_battery(battery); 926 power_supply_unregister(battery->bat); 927 battery->bat = NULL; 928 mutex_unlock(&battery->sysfs_lock); 929 } 930 931 static void find_battery(const struct dmi_header *dm, void *private) 932 { 933 struct acpi_battery *battery = (struct acpi_battery *)private; 934 /* Note: the hardcoded offsets below have been extracted from 935 * the source code of dmidecode. 936 */ 937 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) { 938 const u8 *dmi_data = (const u8 *)(dm + 1); 939 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6)); 940 941 if (dm->length >= 18) 942 dmi_capacity *= dmi_data[17]; 943 if (battery->design_capacity * battery->design_voltage / 1000 944 != dmi_capacity && 945 battery->design_capacity * 10 == dmi_capacity) 946 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, 947 &battery->flags); 948 } 949 } 950 951 /* 952 * According to the ACPI spec, some kinds of primary batteries can 953 * report percentage battery remaining capacity directly to OS. 954 * In this case, it reports the Last Full Charged Capacity == 100 955 * and BatteryPresentRate == 0xFFFFFFFF. 956 * 957 * Now we found some battery reports percentage remaining capacity 958 * even if it's rechargeable. 959 * https://bugzilla.kernel.org/show_bug.cgi?id=15979 960 * 961 * Handle this correctly so that they won't break userspace. 962 */ 963 static void acpi_battery_quirks(struct acpi_battery *battery) 964 { 965 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) 966 return; 967 968 if (battery->full_charge_capacity == 100 && 969 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN && 970 battery->capacity_now >= 0 && battery->capacity_now <= 100) { 971 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags); 972 battery->full_charge_capacity = battery->design_capacity; 973 battery->capacity_now = (battery->capacity_now * 974 battery->full_charge_capacity) / 100; 975 } 976 977 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags)) 978 return; 979 980 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) { 981 const char *s; 982 983 s = dmi_get_system_info(DMI_PRODUCT_VERSION); 984 if (s && !strncasecmp(s, "ThinkPad", 8)) { 985 dmi_walk(find_battery, battery); 986 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, 987 &battery->flags) && 988 battery->design_voltage) { 989 battery->design_capacity = 990 battery->design_capacity * 991 10000 / battery->design_voltage; 992 battery->full_charge_capacity = 993 battery->full_charge_capacity * 994 10000 / battery->design_voltage; 995 battery->design_capacity_warning = 996 battery->design_capacity_warning * 997 10000 / battery->design_voltage; 998 battery->capacity_now = battery->capacity_now * 999 10000 / battery->design_voltage; 1000 } 1001 } 1002 } 1003 1004 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags)) 1005 return; 1006 1007 if (acpi_battery_is_degraded(battery) && 1008 battery->capacity_now > battery->full_charge_capacity) { 1009 set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags); 1010 battery->capacity_now = battery->full_charge_capacity; 1011 } 1012 } 1013 1014 static int acpi_battery_update(struct acpi_battery *battery, bool resume) 1015 { 1016 int result = acpi_battery_get_status(battery); 1017 1018 if (result) 1019 return result; 1020 1021 if (!acpi_battery_present(battery)) { 1022 sysfs_remove_battery(battery); 1023 battery->update_time = 0; 1024 return 0; 1025 } 1026 1027 if (resume) 1028 return 0; 1029 1030 if (!battery->update_time) { 1031 result = acpi_battery_get_info(battery); 1032 if (result) 1033 return result; 1034 acpi_battery_init_alarm(battery); 1035 } 1036 1037 result = acpi_battery_get_state(battery); 1038 if (result) 1039 return result; 1040 acpi_battery_quirks(battery); 1041 1042 if (!battery->bat) { 1043 result = sysfs_add_battery(battery); 1044 if (result) 1045 return result; 1046 } 1047 1048 /* 1049 * Wakeup the system if battery is critical low 1050 * or lower than the alarm level 1051 */ 1052 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) || 1053 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) && 1054 (battery->capacity_now <= battery->alarm))) 1055 acpi_pm_wakeup_event(&battery->device->dev); 1056 1057 return result; 1058 } 1059 1060 static void acpi_battery_refresh(struct acpi_battery *battery) 1061 { 1062 int power_unit; 1063 1064 if (!battery->bat) 1065 return; 1066 1067 power_unit = battery->power_unit; 1068 1069 acpi_battery_get_info(battery); 1070 1071 if (power_unit == battery->power_unit) 1072 return; 1073 1074 /* The battery has changed its reporting units. */ 1075 sysfs_remove_battery(battery); 1076 sysfs_add_battery(battery); 1077 } 1078 1079 /* Driver Interface */ 1080 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data) 1081 { 1082 struct acpi_device *device = data; 1083 struct acpi_battery *battery = acpi_driver_data(device); 1084 struct power_supply *old; 1085 1086 if (!battery) 1087 return; 1088 old = battery->bat; 1089 /* 1090 * On Acer Aspire V5-573G notifications are sometimes triggered too 1091 * early. For example, when AC is unplugged and notification is 1092 * triggered, battery state is still reported as "Full", and changes to 1093 * "Discharging" only after short delay, without any notification. 1094 */ 1095 if (battery_notification_delay_ms > 0) 1096 msleep(battery_notification_delay_ms); 1097 if (event == ACPI_BATTERY_NOTIFY_INFO) 1098 acpi_battery_refresh(battery); 1099 acpi_battery_update(battery, false); 1100 acpi_bus_generate_netlink_event(device->pnp.device_class, 1101 dev_name(&device->dev), event, 1102 acpi_battery_present(battery)); 1103 acpi_notifier_call_chain(device, event, acpi_battery_present(battery)); 1104 /* acpi_battery_update could remove power_supply object */ 1105 if (old && battery->bat) 1106 power_supply_changed(battery->bat); 1107 } 1108 1109 static int battery_notify(struct notifier_block *nb, 1110 unsigned long mode, void *_unused) 1111 { 1112 struct acpi_battery *battery = container_of(nb, struct acpi_battery, 1113 pm_nb); 1114 int result; 1115 1116 switch (mode) { 1117 case PM_POST_HIBERNATION: 1118 case PM_POST_SUSPEND: 1119 if (!acpi_battery_present(battery)) 1120 return 0; 1121 1122 if (battery->bat) { 1123 acpi_battery_refresh(battery); 1124 } else { 1125 result = acpi_battery_get_info(battery); 1126 if (result) 1127 return result; 1128 1129 result = sysfs_add_battery(battery); 1130 if (result) 1131 return result; 1132 } 1133 1134 acpi_battery_init_alarm(battery); 1135 acpi_battery_get_state(battery); 1136 break; 1137 } 1138 1139 return 0; 1140 } 1141 1142 static int __init 1143 battery_bix_broken_package_quirk(const struct dmi_system_id *d) 1144 { 1145 battery_bix_broken_package = 1; 1146 return 0; 1147 } 1148 1149 static int __init 1150 battery_notification_delay_quirk(const struct dmi_system_id *d) 1151 { 1152 battery_notification_delay_ms = 1000; 1153 return 0; 1154 } 1155 1156 static int __init 1157 battery_ac_is_broken_quirk(const struct dmi_system_id *d) 1158 { 1159 battery_ac_is_broken = 1; 1160 return 0; 1161 } 1162 1163 static const struct dmi_system_id bat_dmi_table[] __initconst = { 1164 { 1165 /* NEC LZ750/LS */ 1166 .callback = battery_bix_broken_package_quirk, 1167 .matches = { 1168 DMI_MATCH(DMI_SYS_VENDOR, "NEC"), 1169 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"), 1170 }, 1171 }, 1172 { 1173 /* Acer Aspire V5-573G */ 1174 .callback = battery_notification_delay_quirk, 1175 .matches = { 1176 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 1177 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"), 1178 }, 1179 }, 1180 { 1181 /* Point of View mobii wintab p800w */ 1182 .callback = battery_ac_is_broken_quirk, 1183 .matches = { 1184 DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"), 1185 DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"), 1186 DMI_MATCH(DMI_BIOS_VERSION, "3BAIR1013"), 1187 /* Above matches are too generic, add bios-date match */ 1188 DMI_MATCH(DMI_BIOS_DATE, "08/22/2014"), 1189 }, 1190 }, 1191 { 1192 /* Microsoft Surface Go 3 */ 1193 .callback = battery_notification_delay_quirk, 1194 .matches = { 1195 DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), 1196 DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go 3"), 1197 }, 1198 }, 1199 {}, 1200 }; 1201 1202 /* 1203 * Some machines'(E,G Lenovo Z480) ECs are not stable 1204 * during boot up and this causes battery driver fails to be 1205 * probed due to failure of getting battery information 1206 * from EC sometimes. After several retries, the operation 1207 * may work. So add retry code here and 20ms sleep between 1208 * every retries. 1209 */ 1210 static int acpi_battery_update_retry(struct acpi_battery *battery) 1211 { 1212 int retry, ret; 1213 1214 for (retry = 5; retry; retry--) { 1215 ret = acpi_battery_update(battery, false); 1216 if (!ret) 1217 break; 1218 1219 msleep(20); 1220 } 1221 return ret; 1222 } 1223 1224 static int acpi_battery_add(struct acpi_device *device) 1225 { 1226 int result = 0; 1227 struct acpi_battery *battery; 1228 1229 if (!device) 1230 return -EINVAL; 1231 1232 if (device->dep_unmet) 1233 return -EPROBE_DEFER; 1234 1235 battery = devm_kzalloc(&device->dev, sizeof(*battery), GFP_KERNEL); 1236 if (!battery) 1237 return -ENOMEM; 1238 battery->device = device; 1239 strscpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME); 1240 strscpy(acpi_device_class(device), ACPI_BATTERY_CLASS); 1241 device->driver_data = battery; 1242 result = devm_mutex_init(&device->dev, &battery->lock); 1243 if (result) 1244 return result; 1245 1246 result = devm_mutex_init(&device->dev, &battery->sysfs_lock); 1247 if (result) 1248 return result; 1249 1250 if (acpi_has_method(battery->device->handle, "_BIX")) 1251 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags); 1252 1253 result = acpi_battery_update_retry(battery); 1254 if (result) 1255 goto fail; 1256 1257 pr_info("Slot [%s] (battery %s)\n", acpi_device_bid(device), 1258 device->status.battery_present ? "present" : "absent"); 1259 1260 battery->pm_nb.notifier_call = battery_notify; 1261 result = register_pm_notifier(&battery->pm_nb); 1262 if (result) 1263 goto fail; 1264 1265 device_init_wakeup(&device->dev, 1); 1266 1267 result = acpi_dev_install_notify_handler(device, ACPI_ALL_NOTIFY, 1268 acpi_battery_notify, device); 1269 if (result) 1270 goto fail_pm; 1271 1272 return 0; 1273 1274 fail_pm: 1275 device_init_wakeup(&device->dev, 0); 1276 unregister_pm_notifier(&battery->pm_nb); 1277 fail: 1278 sysfs_remove_battery(battery); 1279 1280 return result; 1281 } 1282 1283 static void acpi_battery_remove(struct acpi_device *device) 1284 { 1285 struct acpi_battery *battery; 1286 1287 if (!device || !acpi_driver_data(device)) 1288 return; 1289 1290 battery = acpi_driver_data(device); 1291 1292 acpi_dev_remove_notify_handler(device, ACPI_ALL_NOTIFY, 1293 acpi_battery_notify); 1294 1295 device_init_wakeup(&device->dev, 0); 1296 unregister_pm_notifier(&battery->pm_nb); 1297 sysfs_remove_battery(battery); 1298 } 1299 1300 /* this is needed to learn about changes made in suspended state */ 1301 static int acpi_battery_resume(struct device *dev) 1302 { 1303 struct acpi_battery *battery; 1304 1305 if (!dev) 1306 return -EINVAL; 1307 1308 battery = acpi_driver_data(to_acpi_device(dev)); 1309 if (!battery) 1310 return -EINVAL; 1311 1312 battery->update_time = 0; 1313 acpi_battery_update(battery, true); 1314 return 0; 1315 } 1316 1317 static DEFINE_SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume); 1318 1319 static struct acpi_driver acpi_battery_driver = { 1320 .name = "battery", 1321 .class = ACPI_BATTERY_CLASS, 1322 .ids = battery_device_ids, 1323 .ops = { 1324 .add = acpi_battery_add, 1325 .remove = acpi_battery_remove, 1326 }, 1327 .drv.pm = pm_sleep_ptr(&acpi_battery_pm), 1328 .drv.probe_type = PROBE_PREFER_ASYNCHRONOUS, 1329 }; 1330 1331 static int __init acpi_battery_init(void) 1332 { 1333 if (acpi_disabled || acpi_quirk_skip_acpi_ac_and_battery()) 1334 return -ENODEV; 1335 1336 dmi_check_system(bat_dmi_table); 1337 1338 return acpi_bus_register_driver(&acpi_battery_driver); 1339 } 1340 1341 static void __exit acpi_battery_exit(void) 1342 { 1343 acpi_bus_unregister_driver(&acpi_battery_driver); 1344 battery_hook_exit(); 1345 } 1346 1347 module_init(acpi_battery_init); 1348 module_exit(acpi_battery_exit); 1349