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_check_pmic = 1; 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 /* Lists of PMIC ACPI HIDs with an (often better) native battery driver */ 68 static const char * const acpi_battery_blacklist[] = { 69 "INT33F4", /* X-Powers AXP288 PMIC */ 70 }; 71 72 enum { 73 ACPI_BATTERY_ALARM_PRESENT, 74 ACPI_BATTERY_XINFO_PRESENT, 75 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, 76 /* On Lenovo Thinkpad models from 2010 and 2011, the power unit 77 * switches between mWh and mAh depending on whether the system 78 * is running on battery or not. When mAh is the unit, most 79 * reported values are incorrect and need to be adjusted by 80 * 10000/design_voltage. Verified on x201, t410, t410s, and x220. 81 * Pre-2010 and 2012 models appear to always report in mWh and 82 * are thus unaffected (tested with t42, t61, t500, x200, x300, 83 * and x230). Also, in mid-2012 Lenovo issued a BIOS update for 84 * the 2011 models that fixes the issue (tested on x220 with a 85 * post-1.29 BIOS), but as of Nov. 2012, no such update is 86 * available for the 2010 models. 87 */ 88 ACPI_BATTERY_QUIRK_THINKPAD_MAH, 89 /* for batteries reporting current capacity with design capacity 90 * on a full charge, but showing degradation in full charge cap. 91 */ 92 ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, 93 }; 94 95 struct acpi_battery { 96 struct mutex lock; 97 struct mutex sysfs_lock; 98 struct power_supply *bat; 99 struct power_supply_desc bat_desc; 100 struct acpi_device *device; 101 struct notifier_block pm_nb; 102 struct list_head list; 103 unsigned long update_time; 104 int revision; 105 int rate_now; 106 int capacity_now; 107 int voltage_now; 108 int design_capacity; 109 int full_charge_capacity; 110 int technology; 111 int design_voltage; 112 int design_capacity_warning; 113 int design_capacity_low; 114 int cycle_count; 115 int measurement_accuracy; 116 int max_sampling_time; 117 int min_sampling_time; 118 int max_averaging_interval; 119 int min_averaging_interval; 120 int capacity_granularity_1; 121 int capacity_granularity_2; 122 int alarm; 123 char model_number[32]; 124 char serial_number[32]; 125 char type[32]; 126 char oem_info[32]; 127 int state; 128 int power_unit; 129 unsigned long flags; 130 }; 131 132 #define to_acpi_battery(x) power_supply_get_drvdata(x) 133 134 static inline int acpi_battery_present(struct acpi_battery *battery) 135 { 136 return battery->device->status.battery_present; 137 } 138 139 static int acpi_battery_technology(struct acpi_battery *battery) 140 { 141 if (!strcasecmp("NiCd", battery->type)) 142 return POWER_SUPPLY_TECHNOLOGY_NiCd; 143 if (!strcasecmp("NiMH", battery->type)) 144 return POWER_SUPPLY_TECHNOLOGY_NiMH; 145 if (!strcasecmp("LION", battery->type)) 146 return POWER_SUPPLY_TECHNOLOGY_LION; 147 if (!strncasecmp("LI-ION", battery->type, 6)) 148 return POWER_SUPPLY_TECHNOLOGY_LION; 149 if (!strcasecmp("LiP", battery->type)) 150 return POWER_SUPPLY_TECHNOLOGY_LIPO; 151 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN; 152 } 153 154 static int acpi_battery_get_state(struct acpi_battery *battery); 155 156 static int acpi_battery_is_charged(struct acpi_battery *battery) 157 { 158 /* charging, discharging or critical low */ 159 if (battery->state != 0) 160 return 0; 161 162 /* battery not reporting charge */ 163 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN || 164 battery->capacity_now == 0) 165 return 0; 166 167 /* good batteries update full_charge as the batteries degrade */ 168 if (battery->full_charge_capacity == battery->capacity_now) 169 return 1; 170 171 /* fallback to using design values for broken batteries */ 172 if (battery->design_capacity == battery->capacity_now) 173 return 1; 174 175 /* we don't do any sort of metric based on percentages */ 176 return 0; 177 } 178 179 static bool acpi_battery_is_degraded(struct acpi_battery *battery) 180 { 181 return ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) && 182 ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity) && 183 battery->full_charge_capacity < battery->design_capacity; 184 } 185 186 static int acpi_battery_handle_discharging(struct acpi_battery *battery) 187 { 188 /* 189 * Some devices wrongly report discharging if the battery's charge level 190 * was above the device's start charging threshold atm the AC adapter 191 * was plugged in and the device thus did not start a new charge cycle. 192 */ 193 if ((battery_ac_is_broken || power_supply_is_system_supplied()) && 194 battery->rate_now == 0) 195 return POWER_SUPPLY_STATUS_NOT_CHARGING; 196 197 return POWER_SUPPLY_STATUS_DISCHARGING; 198 } 199 200 static int acpi_battery_get_property(struct power_supply *psy, 201 enum power_supply_property psp, 202 union power_supply_propval *val) 203 { 204 int full_capacity = ACPI_BATTERY_VALUE_UNKNOWN, ret = 0; 205 struct acpi_battery *battery = to_acpi_battery(psy); 206 207 if (acpi_battery_present(battery)) { 208 /* run battery update only if it is present */ 209 acpi_battery_get_state(battery); 210 } else if (psp != POWER_SUPPLY_PROP_PRESENT) 211 return -ENODEV; 212 switch (psp) { 213 case POWER_SUPPLY_PROP_STATUS: 214 if (battery->state & ACPI_BATTERY_STATE_DISCHARGING) 215 val->intval = acpi_battery_handle_discharging(battery); 216 else if (battery->state & ACPI_BATTERY_STATE_CHARGING) 217 val->intval = POWER_SUPPLY_STATUS_CHARGING; 218 else if (acpi_battery_is_charged(battery)) 219 val->intval = POWER_SUPPLY_STATUS_FULL; 220 else 221 val->intval = POWER_SUPPLY_STATUS_UNKNOWN; 222 break; 223 case POWER_SUPPLY_PROP_PRESENT: 224 val->intval = acpi_battery_present(battery); 225 break; 226 case POWER_SUPPLY_PROP_TECHNOLOGY: 227 val->intval = acpi_battery_technology(battery); 228 break; 229 case POWER_SUPPLY_PROP_CYCLE_COUNT: 230 val->intval = battery->cycle_count; 231 break; 232 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: 233 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN) 234 ret = -ENODEV; 235 else 236 val->intval = battery->design_voltage * 1000; 237 break; 238 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 239 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN) 240 ret = -ENODEV; 241 else 242 val->intval = battery->voltage_now * 1000; 243 break; 244 case POWER_SUPPLY_PROP_CURRENT_NOW: 245 case POWER_SUPPLY_PROP_POWER_NOW: 246 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN) 247 ret = -ENODEV; 248 else 249 val->intval = battery->rate_now * 1000; 250 break; 251 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 252 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: 253 if (!ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) 254 ret = -ENODEV; 255 else 256 val->intval = battery->design_capacity * 1000; 257 break; 258 case POWER_SUPPLY_PROP_CHARGE_FULL: 259 case POWER_SUPPLY_PROP_ENERGY_FULL: 260 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity)) 261 ret = -ENODEV; 262 else 263 val->intval = battery->full_charge_capacity * 1000; 264 break; 265 case POWER_SUPPLY_PROP_CHARGE_NOW: 266 case POWER_SUPPLY_PROP_ENERGY_NOW: 267 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN) 268 ret = -ENODEV; 269 else 270 val->intval = battery->capacity_now * 1000; 271 break; 272 case POWER_SUPPLY_PROP_CAPACITY: 273 if (ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity)) 274 full_capacity = battery->full_charge_capacity; 275 else if (ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) 276 full_capacity = battery->design_capacity; 277 278 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN || 279 full_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 280 ret = -ENODEV; 281 else 282 val->intval = battery->capacity_now * 100/ 283 full_capacity; 284 break; 285 case POWER_SUPPLY_PROP_CAPACITY_LEVEL: 286 if (battery->state & ACPI_BATTERY_STATE_CRITICAL) 287 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL; 288 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) && 289 (battery->capacity_now <= battery->alarm)) 290 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW; 291 else if (acpi_battery_is_charged(battery)) 292 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL; 293 else 294 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; 295 break; 296 case POWER_SUPPLY_PROP_MODEL_NAME: 297 val->strval = battery->model_number; 298 break; 299 case POWER_SUPPLY_PROP_MANUFACTURER: 300 val->strval = battery->oem_info; 301 break; 302 case POWER_SUPPLY_PROP_SERIAL_NUMBER: 303 val->strval = battery->serial_number; 304 break; 305 default: 306 ret = -EINVAL; 307 } 308 return ret; 309 } 310 311 static enum power_supply_property charge_battery_props[] = { 312 POWER_SUPPLY_PROP_STATUS, 313 POWER_SUPPLY_PROP_PRESENT, 314 POWER_SUPPLY_PROP_TECHNOLOGY, 315 POWER_SUPPLY_PROP_CYCLE_COUNT, 316 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 317 POWER_SUPPLY_PROP_VOLTAGE_NOW, 318 POWER_SUPPLY_PROP_CURRENT_NOW, 319 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 320 POWER_SUPPLY_PROP_CHARGE_FULL, 321 POWER_SUPPLY_PROP_CHARGE_NOW, 322 POWER_SUPPLY_PROP_CAPACITY, 323 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 324 POWER_SUPPLY_PROP_MODEL_NAME, 325 POWER_SUPPLY_PROP_MANUFACTURER, 326 POWER_SUPPLY_PROP_SERIAL_NUMBER, 327 }; 328 329 static enum power_supply_property charge_battery_full_cap_broken_props[] = { 330 POWER_SUPPLY_PROP_STATUS, 331 POWER_SUPPLY_PROP_PRESENT, 332 POWER_SUPPLY_PROP_TECHNOLOGY, 333 POWER_SUPPLY_PROP_CYCLE_COUNT, 334 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 335 POWER_SUPPLY_PROP_VOLTAGE_NOW, 336 POWER_SUPPLY_PROP_CURRENT_NOW, 337 POWER_SUPPLY_PROP_CHARGE_NOW, 338 POWER_SUPPLY_PROP_MODEL_NAME, 339 POWER_SUPPLY_PROP_MANUFACTURER, 340 POWER_SUPPLY_PROP_SERIAL_NUMBER, 341 }; 342 343 static enum power_supply_property energy_battery_props[] = { 344 POWER_SUPPLY_PROP_STATUS, 345 POWER_SUPPLY_PROP_PRESENT, 346 POWER_SUPPLY_PROP_TECHNOLOGY, 347 POWER_SUPPLY_PROP_CYCLE_COUNT, 348 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 349 POWER_SUPPLY_PROP_VOLTAGE_NOW, 350 POWER_SUPPLY_PROP_POWER_NOW, 351 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 352 POWER_SUPPLY_PROP_ENERGY_FULL, 353 POWER_SUPPLY_PROP_ENERGY_NOW, 354 POWER_SUPPLY_PROP_CAPACITY, 355 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 356 POWER_SUPPLY_PROP_MODEL_NAME, 357 POWER_SUPPLY_PROP_MANUFACTURER, 358 POWER_SUPPLY_PROP_SERIAL_NUMBER, 359 }; 360 361 static enum power_supply_property energy_battery_full_cap_broken_props[] = { 362 POWER_SUPPLY_PROP_STATUS, 363 POWER_SUPPLY_PROP_PRESENT, 364 POWER_SUPPLY_PROP_TECHNOLOGY, 365 POWER_SUPPLY_PROP_CYCLE_COUNT, 366 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 367 POWER_SUPPLY_PROP_VOLTAGE_NOW, 368 POWER_SUPPLY_PROP_POWER_NOW, 369 POWER_SUPPLY_PROP_ENERGY_NOW, 370 POWER_SUPPLY_PROP_MODEL_NAME, 371 POWER_SUPPLY_PROP_MANUFACTURER, 372 POWER_SUPPLY_PROP_SERIAL_NUMBER, 373 }; 374 375 /* Battery Management */ 376 struct acpi_offsets { 377 size_t offset; /* offset inside struct acpi_sbs_battery */ 378 u8 mode; /* int or string? */ 379 }; 380 381 static const struct acpi_offsets state_offsets[] = { 382 {offsetof(struct acpi_battery, state), 0}, 383 {offsetof(struct acpi_battery, rate_now), 0}, 384 {offsetof(struct acpi_battery, capacity_now), 0}, 385 {offsetof(struct acpi_battery, voltage_now), 0}, 386 }; 387 388 static const struct acpi_offsets info_offsets[] = { 389 {offsetof(struct acpi_battery, power_unit), 0}, 390 {offsetof(struct acpi_battery, design_capacity), 0}, 391 {offsetof(struct acpi_battery, full_charge_capacity), 0}, 392 {offsetof(struct acpi_battery, technology), 0}, 393 {offsetof(struct acpi_battery, design_voltage), 0}, 394 {offsetof(struct acpi_battery, design_capacity_warning), 0}, 395 {offsetof(struct acpi_battery, design_capacity_low), 0}, 396 {offsetof(struct acpi_battery, capacity_granularity_1), 0}, 397 {offsetof(struct acpi_battery, capacity_granularity_2), 0}, 398 {offsetof(struct acpi_battery, model_number), 1}, 399 {offsetof(struct acpi_battery, serial_number), 1}, 400 {offsetof(struct acpi_battery, type), 1}, 401 {offsetof(struct acpi_battery, oem_info), 1}, 402 }; 403 404 static const struct acpi_offsets extended_info_offsets[] = { 405 {offsetof(struct acpi_battery, revision), 0}, 406 {offsetof(struct acpi_battery, power_unit), 0}, 407 {offsetof(struct acpi_battery, design_capacity), 0}, 408 {offsetof(struct acpi_battery, full_charge_capacity), 0}, 409 {offsetof(struct acpi_battery, technology), 0}, 410 {offsetof(struct acpi_battery, design_voltage), 0}, 411 {offsetof(struct acpi_battery, design_capacity_warning), 0}, 412 {offsetof(struct acpi_battery, design_capacity_low), 0}, 413 {offsetof(struct acpi_battery, cycle_count), 0}, 414 {offsetof(struct acpi_battery, measurement_accuracy), 0}, 415 {offsetof(struct acpi_battery, max_sampling_time), 0}, 416 {offsetof(struct acpi_battery, min_sampling_time), 0}, 417 {offsetof(struct acpi_battery, max_averaging_interval), 0}, 418 {offsetof(struct acpi_battery, min_averaging_interval), 0}, 419 {offsetof(struct acpi_battery, capacity_granularity_1), 0}, 420 {offsetof(struct acpi_battery, capacity_granularity_2), 0}, 421 {offsetof(struct acpi_battery, model_number), 1}, 422 {offsetof(struct acpi_battery, serial_number), 1}, 423 {offsetof(struct acpi_battery, type), 1}, 424 {offsetof(struct acpi_battery, oem_info), 1}, 425 }; 426 427 static int extract_package(struct acpi_battery *battery, 428 union acpi_object *package, 429 const struct acpi_offsets *offsets, int num) 430 { 431 int i; 432 union acpi_object *element; 433 434 if (package->type != ACPI_TYPE_PACKAGE) 435 return -EFAULT; 436 for (i = 0; i < num; ++i) { 437 if (package->package.count <= i) 438 return -EFAULT; 439 element = &package->package.elements[i]; 440 if (offsets[i].mode) { 441 u8 *ptr = (u8 *)battery + offsets[i].offset; 442 443 if (element->type == ACPI_TYPE_STRING || 444 element->type == ACPI_TYPE_BUFFER) 445 strncpy(ptr, element->string.pointer, 32); 446 else if (element->type == ACPI_TYPE_INTEGER) { 447 strncpy(ptr, (u8 *)&element->integer.value, 448 sizeof(u64)); 449 ptr[sizeof(u64)] = 0; 450 } else 451 *ptr = 0; /* don't have value */ 452 } else { 453 int *x = (int *)((u8 *)battery + offsets[i].offset); 454 *x = (element->type == ACPI_TYPE_INTEGER) ? 455 element->integer.value : -1; 456 } 457 } 458 return 0; 459 } 460 461 static int acpi_battery_get_status(struct acpi_battery *battery) 462 { 463 if (acpi_bus_get_status(battery->device)) { 464 acpi_handle_info(battery->device->handle, 465 "_STA evaluation failed\n"); 466 return -ENODEV; 467 } 468 return 0; 469 } 470 471 472 static int extract_battery_info(const int use_bix, 473 struct acpi_battery *battery, 474 const struct acpi_buffer *buffer) 475 { 476 int result = -EFAULT; 477 478 if (use_bix && battery_bix_broken_package) 479 result = extract_package(battery, buffer->pointer, 480 extended_info_offsets + 1, 481 ARRAY_SIZE(extended_info_offsets) - 1); 482 else if (use_bix) 483 result = extract_package(battery, buffer->pointer, 484 extended_info_offsets, 485 ARRAY_SIZE(extended_info_offsets)); 486 else 487 result = extract_package(battery, buffer->pointer, 488 info_offsets, ARRAY_SIZE(info_offsets)); 489 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) 490 battery->full_charge_capacity = battery->design_capacity; 491 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) && 492 battery->power_unit && battery->design_voltage) { 493 battery->design_capacity = battery->design_capacity * 494 10000 / battery->design_voltage; 495 battery->full_charge_capacity = battery->full_charge_capacity * 496 10000 / battery->design_voltage; 497 battery->design_capacity_warning = 498 battery->design_capacity_warning * 499 10000 / battery->design_voltage; 500 /* Curiously, design_capacity_low, unlike the rest of them, 501 * is correct. 502 */ 503 /* capacity_granularity_* equal 1 on the systems tested, so 504 * it's impossible to tell if they would need an adjustment 505 * or not if their values were higher. 506 */ 507 } 508 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) && 509 battery->capacity_now > battery->full_charge_capacity) 510 battery->capacity_now = battery->full_charge_capacity; 511 512 return result; 513 } 514 515 static int acpi_battery_get_info(struct acpi_battery *battery) 516 { 517 const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags); 518 int use_bix; 519 int result = -ENODEV; 520 521 if (!acpi_battery_present(battery)) 522 return 0; 523 524 525 for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) { 526 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 527 acpi_status status = AE_ERROR; 528 529 mutex_lock(&battery->lock); 530 status = acpi_evaluate_object(battery->device->handle, 531 use_bix ? "_BIX":"_BIF", 532 NULL, &buffer); 533 mutex_unlock(&battery->lock); 534 535 if (ACPI_FAILURE(status)) { 536 acpi_handle_info(battery->device->handle, 537 "%s evaluation failed: %s\n", 538 use_bix ? "_BIX":"_BIF", 539 acpi_format_exception(status)); 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_handle_info(battery->device->handle, 577 "_BST evaluation failed: %s", 578 acpi_format_exception(status)); 579 return -ENODEV; 580 } 581 582 result = extract_package(battery, buffer.pointer, 583 state_offsets, ARRAY_SIZE(state_offsets)); 584 battery->update_time = jiffies; 585 kfree(buffer.pointer); 586 587 /* For buggy DSDTs that report negative 16-bit values for either 588 * charging or discharging current and/or report 0 as 65536 589 * due to bad math. 590 */ 591 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA && 592 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN && 593 (s16)(battery->rate_now) < 0) { 594 battery->rate_now = abs((s16)battery->rate_now); 595 pr_warn_once(FW_BUG "(dis)charge rate invalid.\n"); 596 } 597 598 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags) 599 && battery->capacity_now >= 0 && battery->capacity_now <= 100) 600 battery->capacity_now = (battery->capacity_now * 601 battery->full_charge_capacity) / 100; 602 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) && 603 battery->power_unit && battery->design_voltage) { 604 battery->capacity_now = battery->capacity_now * 605 10000 / battery->design_voltage; 606 } 607 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) && 608 battery->capacity_now > battery->full_charge_capacity) 609 battery->capacity_now = battery->full_charge_capacity; 610 611 return result; 612 } 613 614 static int acpi_battery_set_alarm(struct acpi_battery *battery) 615 { 616 acpi_status status = 0; 617 618 if (!acpi_battery_present(battery) || 619 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags)) 620 return -ENODEV; 621 622 mutex_lock(&battery->lock); 623 status = acpi_execute_simple_method(battery->device->handle, "_BTP", 624 battery->alarm); 625 mutex_unlock(&battery->lock); 626 627 if (ACPI_FAILURE(status)) 628 return -ENODEV; 629 630 acpi_handle_debug(battery->device->handle, "Alarm set to %d\n", 631 battery->alarm); 632 633 return 0; 634 } 635 636 static int acpi_battery_init_alarm(struct acpi_battery *battery) 637 { 638 /* See if alarms are supported, and if so, set default */ 639 if (!acpi_has_method(battery->device->handle, "_BTP")) { 640 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags); 641 return 0; 642 } 643 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags); 644 if (!battery->alarm) 645 battery->alarm = battery->design_capacity_warning; 646 return acpi_battery_set_alarm(battery); 647 } 648 649 static ssize_t acpi_battery_alarm_show(struct device *dev, 650 struct device_attribute *attr, 651 char *buf) 652 { 653 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 654 655 return sprintf(buf, "%d\n", battery->alarm * 1000); 656 } 657 658 static ssize_t acpi_battery_alarm_store(struct device *dev, 659 struct device_attribute *attr, 660 const char *buf, size_t count) 661 { 662 unsigned long x; 663 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 664 665 if (sscanf(buf, "%lu\n", &x) == 1) 666 battery->alarm = x/1000; 667 if (acpi_battery_present(battery)) 668 acpi_battery_set_alarm(battery); 669 return count; 670 } 671 672 static const struct device_attribute alarm_attr = { 673 .attr = {.name = "alarm", .mode = 0644}, 674 .show = acpi_battery_alarm_show, 675 .store = acpi_battery_alarm_store, 676 }; 677 678 /* 679 * The Battery Hooking API 680 * 681 * This API is used inside other drivers that need to expose 682 * platform-specific behaviour within the generic driver in a 683 * generic way. 684 * 685 */ 686 687 static LIST_HEAD(acpi_battery_list); 688 static LIST_HEAD(battery_hook_list); 689 static DEFINE_MUTEX(hook_mutex); 690 691 static void __battery_hook_unregister(struct acpi_battery_hook *hook, int lock) 692 { 693 struct acpi_battery *battery; 694 /* 695 * In order to remove a hook, we first need to 696 * de-register all the batteries that are registered. 697 */ 698 if (lock) 699 mutex_lock(&hook_mutex); 700 list_for_each_entry(battery, &acpi_battery_list, list) { 701 hook->remove_battery(battery->bat); 702 } 703 list_del(&hook->list); 704 if (lock) 705 mutex_unlock(&hook_mutex); 706 pr_info("extension unregistered: %s\n", hook->name); 707 } 708 709 void battery_hook_unregister(struct acpi_battery_hook *hook) 710 { 711 __battery_hook_unregister(hook, 1); 712 } 713 EXPORT_SYMBOL_GPL(battery_hook_unregister); 714 715 void battery_hook_register(struct acpi_battery_hook *hook) 716 { 717 struct acpi_battery *battery; 718 719 mutex_lock(&hook_mutex); 720 INIT_LIST_HEAD(&hook->list); 721 list_add(&hook->list, &battery_hook_list); 722 /* 723 * Now that the driver is registered, we need 724 * to notify the hook that a battery is available 725 * for each battery, so that the driver may add 726 * its attributes. 727 */ 728 list_for_each_entry(battery, &acpi_battery_list, list) { 729 if (hook->add_battery(battery->bat)) { 730 /* 731 * If a add-battery returns non-zero, 732 * the registration of the extension has failed, 733 * and we will not add it to the list of loaded 734 * hooks. 735 */ 736 pr_err("extension failed to load: %s", hook->name); 737 __battery_hook_unregister(hook, 0); 738 goto end; 739 } 740 } 741 pr_info("new extension: %s\n", hook->name); 742 end: 743 mutex_unlock(&hook_mutex); 744 } 745 EXPORT_SYMBOL_GPL(battery_hook_register); 746 747 /* 748 * This function gets called right after the battery sysfs 749 * attributes have been added, so that the drivers that 750 * define custom sysfs attributes can add their own. 751 */ 752 static void battery_hook_add_battery(struct acpi_battery *battery) 753 { 754 struct acpi_battery_hook *hook_node, *tmp; 755 756 mutex_lock(&hook_mutex); 757 INIT_LIST_HEAD(&battery->list); 758 list_add(&battery->list, &acpi_battery_list); 759 /* 760 * Since we added a new battery to the list, we need to 761 * iterate over the hooks and call add_battery for each 762 * hook that was registered. This usually happens 763 * when a battery gets hotplugged or initialized 764 * during the battery module initialization. 765 */ 766 list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) { 767 if (hook_node->add_battery(battery->bat)) { 768 /* 769 * The notification of the extensions has failed, to 770 * prevent further errors we will unload the extension. 771 */ 772 pr_err("error in extension, unloading: %s", 773 hook_node->name); 774 __battery_hook_unregister(hook_node, 0); 775 } 776 } 777 mutex_unlock(&hook_mutex); 778 } 779 780 static void battery_hook_remove_battery(struct acpi_battery *battery) 781 { 782 struct acpi_battery_hook *hook; 783 784 mutex_lock(&hook_mutex); 785 /* 786 * Before removing the hook, we need to remove all 787 * custom attributes from the battery. 788 */ 789 list_for_each_entry(hook, &battery_hook_list, list) { 790 hook->remove_battery(battery->bat); 791 } 792 /* Then, just remove the battery from the list */ 793 list_del(&battery->list); 794 mutex_unlock(&hook_mutex); 795 } 796 797 static void __exit battery_hook_exit(void) 798 { 799 struct acpi_battery_hook *hook; 800 struct acpi_battery_hook *ptr; 801 /* 802 * At this point, the acpi_bus_unregister_driver() 803 * has called remove for all batteries. We just 804 * need to remove the hooks. 805 */ 806 list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) { 807 __battery_hook_unregister(hook, 1); 808 } 809 mutex_destroy(&hook_mutex); 810 } 811 812 static int sysfs_add_battery(struct acpi_battery *battery) 813 { 814 struct power_supply_config psy_cfg = { .drv_data = battery, }; 815 bool full_cap_broken = false; 816 817 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) && 818 !ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) 819 full_cap_broken = true; 820 821 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) { 822 if (full_cap_broken) { 823 battery->bat_desc.properties = 824 charge_battery_full_cap_broken_props; 825 battery->bat_desc.num_properties = 826 ARRAY_SIZE(charge_battery_full_cap_broken_props); 827 } else { 828 battery->bat_desc.properties = charge_battery_props; 829 battery->bat_desc.num_properties = 830 ARRAY_SIZE(charge_battery_props); 831 } 832 } else { 833 if (full_cap_broken) { 834 battery->bat_desc.properties = 835 energy_battery_full_cap_broken_props; 836 battery->bat_desc.num_properties = 837 ARRAY_SIZE(energy_battery_full_cap_broken_props); 838 } else { 839 battery->bat_desc.properties = energy_battery_props; 840 battery->bat_desc.num_properties = 841 ARRAY_SIZE(energy_battery_props); 842 } 843 } 844 845 battery->bat_desc.name = acpi_device_bid(battery->device); 846 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY; 847 battery->bat_desc.get_property = acpi_battery_get_property; 848 849 battery->bat = power_supply_register_no_ws(&battery->device->dev, 850 &battery->bat_desc, &psy_cfg); 851 852 if (IS_ERR(battery->bat)) { 853 int result = PTR_ERR(battery->bat); 854 855 battery->bat = NULL; 856 return result; 857 } 858 battery_hook_add_battery(battery); 859 return device_create_file(&battery->bat->dev, &alarm_attr); 860 } 861 862 static void sysfs_remove_battery(struct acpi_battery *battery) 863 { 864 mutex_lock(&battery->sysfs_lock); 865 if (!battery->bat) { 866 mutex_unlock(&battery->sysfs_lock); 867 return; 868 } 869 battery_hook_remove_battery(battery); 870 device_remove_file(&battery->bat->dev, &alarm_attr); 871 power_supply_unregister(battery->bat); 872 battery->bat = NULL; 873 mutex_unlock(&battery->sysfs_lock); 874 } 875 876 static void find_battery(const struct dmi_header *dm, void *private) 877 { 878 struct acpi_battery *battery = (struct acpi_battery *)private; 879 /* Note: the hardcoded offsets below have been extracted from 880 * the source code of dmidecode. 881 */ 882 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) { 883 const u8 *dmi_data = (const u8 *)(dm + 1); 884 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6)); 885 886 if (dm->length >= 18) 887 dmi_capacity *= dmi_data[17]; 888 if (battery->design_capacity * battery->design_voltage / 1000 889 != dmi_capacity && 890 battery->design_capacity * 10 == dmi_capacity) 891 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, 892 &battery->flags); 893 } 894 } 895 896 /* 897 * According to the ACPI spec, some kinds of primary batteries can 898 * report percentage battery remaining capacity directly to OS. 899 * In this case, it reports the Last Full Charged Capacity == 100 900 * and BatteryPresentRate == 0xFFFFFFFF. 901 * 902 * Now we found some battery reports percentage remaining capacity 903 * even if it's rechargeable. 904 * https://bugzilla.kernel.org/show_bug.cgi?id=15979 905 * 906 * Handle this correctly so that they won't break userspace. 907 */ 908 static void acpi_battery_quirks(struct acpi_battery *battery) 909 { 910 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) 911 return; 912 913 if (battery->full_charge_capacity == 100 && 914 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN && 915 battery->capacity_now >= 0 && battery->capacity_now <= 100) { 916 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags); 917 battery->full_charge_capacity = battery->design_capacity; 918 battery->capacity_now = (battery->capacity_now * 919 battery->full_charge_capacity) / 100; 920 } 921 922 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags)) 923 return; 924 925 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) { 926 const char *s; 927 928 s = dmi_get_system_info(DMI_PRODUCT_VERSION); 929 if (s && !strncasecmp(s, "ThinkPad", 8)) { 930 dmi_walk(find_battery, battery); 931 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, 932 &battery->flags) && 933 battery->design_voltage) { 934 battery->design_capacity = 935 battery->design_capacity * 936 10000 / battery->design_voltage; 937 battery->full_charge_capacity = 938 battery->full_charge_capacity * 939 10000 / battery->design_voltage; 940 battery->design_capacity_warning = 941 battery->design_capacity_warning * 942 10000 / battery->design_voltage; 943 battery->capacity_now = battery->capacity_now * 944 10000 / battery->design_voltage; 945 } 946 } 947 } 948 949 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags)) 950 return; 951 952 if (acpi_battery_is_degraded(battery) && 953 battery->capacity_now > battery->full_charge_capacity) { 954 set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags); 955 battery->capacity_now = battery->full_charge_capacity; 956 } 957 } 958 959 static int acpi_battery_update(struct acpi_battery *battery, bool resume) 960 { 961 int result = acpi_battery_get_status(battery); 962 963 if (result) 964 return result; 965 966 if (!acpi_battery_present(battery)) { 967 sysfs_remove_battery(battery); 968 battery->update_time = 0; 969 return 0; 970 } 971 972 if (resume) 973 return 0; 974 975 if (!battery->update_time) { 976 result = acpi_battery_get_info(battery); 977 if (result) 978 return result; 979 acpi_battery_init_alarm(battery); 980 } 981 982 result = acpi_battery_get_state(battery); 983 if (result) 984 return result; 985 acpi_battery_quirks(battery); 986 987 if (!battery->bat) { 988 result = sysfs_add_battery(battery); 989 if (result) 990 return result; 991 } 992 993 /* 994 * Wakeup the system if battery is critical low 995 * or lower than the alarm level 996 */ 997 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) || 998 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) && 999 (battery->capacity_now <= battery->alarm))) 1000 acpi_pm_wakeup_event(&battery->device->dev); 1001 1002 return result; 1003 } 1004 1005 static void acpi_battery_refresh(struct acpi_battery *battery) 1006 { 1007 int power_unit; 1008 1009 if (!battery->bat) 1010 return; 1011 1012 power_unit = battery->power_unit; 1013 1014 acpi_battery_get_info(battery); 1015 1016 if (power_unit == battery->power_unit) 1017 return; 1018 1019 /* The battery has changed its reporting units. */ 1020 sysfs_remove_battery(battery); 1021 sysfs_add_battery(battery); 1022 } 1023 1024 /* Driver Interface */ 1025 static void acpi_battery_notify(struct acpi_device *device, u32 event) 1026 { 1027 struct acpi_battery *battery = acpi_driver_data(device); 1028 struct power_supply *old; 1029 1030 if (!battery) 1031 return; 1032 old = battery->bat; 1033 /* 1034 * On Acer Aspire V5-573G notifications are sometimes triggered too 1035 * early. For example, when AC is unplugged and notification is 1036 * triggered, battery state is still reported as "Full", and changes to 1037 * "Discharging" only after short delay, without any notification. 1038 */ 1039 if (battery_notification_delay_ms > 0) 1040 msleep(battery_notification_delay_ms); 1041 if (event == ACPI_BATTERY_NOTIFY_INFO) 1042 acpi_battery_refresh(battery); 1043 acpi_battery_update(battery, false); 1044 acpi_bus_generate_netlink_event(device->pnp.device_class, 1045 dev_name(&device->dev), event, 1046 acpi_battery_present(battery)); 1047 acpi_notifier_call_chain(device, event, acpi_battery_present(battery)); 1048 /* acpi_battery_update could remove power_supply object */ 1049 if (old && battery->bat) 1050 power_supply_changed(battery->bat); 1051 } 1052 1053 static int battery_notify(struct notifier_block *nb, 1054 unsigned long mode, void *_unused) 1055 { 1056 struct acpi_battery *battery = container_of(nb, struct acpi_battery, 1057 pm_nb); 1058 int result; 1059 1060 switch (mode) { 1061 case PM_POST_HIBERNATION: 1062 case PM_POST_SUSPEND: 1063 if (!acpi_battery_present(battery)) 1064 return 0; 1065 1066 if (battery->bat) { 1067 acpi_battery_refresh(battery); 1068 } else { 1069 result = acpi_battery_get_info(battery); 1070 if (result) 1071 return result; 1072 1073 result = sysfs_add_battery(battery); 1074 if (result) 1075 return result; 1076 } 1077 1078 acpi_battery_init_alarm(battery); 1079 acpi_battery_get_state(battery); 1080 break; 1081 } 1082 1083 return 0; 1084 } 1085 1086 static int __init 1087 battery_bix_broken_package_quirk(const struct dmi_system_id *d) 1088 { 1089 battery_bix_broken_package = 1; 1090 return 0; 1091 } 1092 1093 static int __init 1094 battery_notification_delay_quirk(const struct dmi_system_id *d) 1095 { 1096 battery_notification_delay_ms = 1000; 1097 return 0; 1098 } 1099 1100 static int __init 1101 battery_ac_is_broken_quirk(const struct dmi_system_id *d) 1102 { 1103 battery_ac_is_broken = 1; 1104 return 0; 1105 } 1106 1107 static int __init 1108 battery_do_not_check_pmic_quirk(const struct dmi_system_id *d) 1109 { 1110 battery_check_pmic = 0; 1111 return 0; 1112 } 1113 1114 static const struct dmi_system_id bat_dmi_table[] __initconst = { 1115 { 1116 /* NEC LZ750/LS */ 1117 .callback = battery_bix_broken_package_quirk, 1118 .matches = { 1119 DMI_MATCH(DMI_SYS_VENDOR, "NEC"), 1120 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"), 1121 }, 1122 }, 1123 { 1124 /* Acer Aspire V5-573G */ 1125 .callback = battery_notification_delay_quirk, 1126 .matches = { 1127 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 1128 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"), 1129 }, 1130 }, 1131 { 1132 /* Point of View mobii wintab p800w */ 1133 .callback = battery_ac_is_broken_quirk, 1134 .matches = { 1135 DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"), 1136 DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"), 1137 DMI_MATCH(DMI_BIOS_VERSION, "3BAIR1013"), 1138 /* Above matches are too generic, add bios-date match */ 1139 DMI_MATCH(DMI_BIOS_DATE, "08/22/2014"), 1140 }, 1141 }, 1142 { 1143 /* ECS EF20EA, AXP288 PMIC but uses separate fuel-gauge */ 1144 .callback = battery_do_not_check_pmic_quirk, 1145 .matches = { 1146 DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"), 1147 }, 1148 }, 1149 { 1150 /* Lenovo Ideapad Miix 320, AXP288 PMIC, separate fuel-gauge */ 1151 .callback = battery_do_not_check_pmic_quirk, 1152 .matches = { 1153 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 1154 DMI_MATCH(DMI_PRODUCT_NAME, "80XF"), 1155 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"), 1156 }, 1157 }, 1158 {}, 1159 }; 1160 1161 /* 1162 * Some machines'(E,G Lenovo Z480) ECs are not stable 1163 * during boot up and this causes battery driver fails to be 1164 * probed due to failure of getting battery information 1165 * from EC sometimes. After several retries, the operation 1166 * may work. So add retry code here and 20ms sleep between 1167 * every retries. 1168 */ 1169 static int acpi_battery_update_retry(struct acpi_battery *battery) 1170 { 1171 int retry, ret; 1172 1173 for (retry = 5; retry; retry--) { 1174 ret = acpi_battery_update(battery, false); 1175 if (!ret) 1176 break; 1177 1178 msleep(20); 1179 } 1180 return ret; 1181 } 1182 1183 static int acpi_battery_add(struct acpi_device *device) 1184 { 1185 int result = 0; 1186 struct acpi_battery *battery = NULL; 1187 1188 if (!device) 1189 return -EINVAL; 1190 1191 if (device->dep_unmet) 1192 return -EPROBE_DEFER; 1193 1194 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL); 1195 if (!battery) 1196 return -ENOMEM; 1197 battery->device = device; 1198 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME); 1199 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS); 1200 device->driver_data = battery; 1201 mutex_init(&battery->lock); 1202 mutex_init(&battery->sysfs_lock); 1203 if (acpi_has_method(battery->device->handle, "_BIX")) 1204 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags); 1205 1206 result = acpi_battery_update_retry(battery); 1207 if (result) 1208 goto fail; 1209 1210 pr_info("Slot [%s] (battery %s)\n", acpi_device_bid(device), 1211 device->status.battery_present ? "present" : "absent"); 1212 1213 battery->pm_nb.notifier_call = battery_notify; 1214 register_pm_notifier(&battery->pm_nb); 1215 1216 device_init_wakeup(&device->dev, 1); 1217 1218 return result; 1219 1220 fail: 1221 sysfs_remove_battery(battery); 1222 mutex_destroy(&battery->lock); 1223 mutex_destroy(&battery->sysfs_lock); 1224 kfree(battery); 1225 return result; 1226 } 1227 1228 static int acpi_battery_remove(struct acpi_device *device) 1229 { 1230 struct acpi_battery *battery = NULL; 1231 1232 if (!device || !acpi_driver_data(device)) 1233 return -EINVAL; 1234 device_init_wakeup(&device->dev, 0); 1235 battery = acpi_driver_data(device); 1236 unregister_pm_notifier(&battery->pm_nb); 1237 sysfs_remove_battery(battery); 1238 mutex_destroy(&battery->lock); 1239 mutex_destroy(&battery->sysfs_lock); 1240 kfree(battery); 1241 return 0; 1242 } 1243 1244 #ifdef CONFIG_PM_SLEEP 1245 /* this is needed to learn about changes made in suspended state */ 1246 static int acpi_battery_resume(struct device *dev) 1247 { 1248 struct acpi_battery *battery; 1249 1250 if (!dev) 1251 return -EINVAL; 1252 1253 battery = acpi_driver_data(to_acpi_device(dev)); 1254 if (!battery) 1255 return -EINVAL; 1256 1257 battery->update_time = 0; 1258 acpi_battery_update(battery, true); 1259 return 0; 1260 } 1261 #else 1262 #define acpi_battery_resume NULL 1263 #endif 1264 1265 static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume); 1266 1267 static struct acpi_driver acpi_battery_driver = { 1268 .name = "battery", 1269 .class = ACPI_BATTERY_CLASS, 1270 .ids = battery_device_ids, 1271 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS, 1272 .ops = { 1273 .add = acpi_battery_add, 1274 .remove = acpi_battery_remove, 1275 .notify = acpi_battery_notify, 1276 }, 1277 .drv.pm = &acpi_battery_pm, 1278 }; 1279 1280 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie) 1281 { 1282 unsigned int i; 1283 int result; 1284 1285 dmi_check_system(bat_dmi_table); 1286 1287 if (battery_check_pmic) { 1288 for (i = 0; i < ARRAY_SIZE(acpi_battery_blacklist); i++) 1289 if (acpi_dev_present(acpi_battery_blacklist[i], "1", -1)) { 1290 pr_info("found native %s PMIC, not loading\n", 1291 acpi_battery_blacklist[i]); 1292 return; 1293 } 1294 } 1295 1296 result = acpi_bus_register_driver(&acpi_battery_driver); 1297 battery_driver_registered = (result == 0); 1298 } 1299 1300 static int __init acpi_battery_init(void) 1301 { 1302 if (acpi_disabled) 1303 return -ENODEV; 1304 1305 async_cookie = async_schedule(acpi_battery_init_async, NULL); 1306 return 0; 1307 } 1308 1309 static void __exit acpi_battery_exit(void) 1310 { 1311 async_synchronize_cookie(async_cookie + 1); 1312 if (battery_driver_registered) { 1313 acpi_bus_unregister_driver(&acpi_battery_driver); 1314 battery_hook_exit(); 1315 } 1316 } 1317 1318 module_init(acpi_battery_init); 1319 module_exit(acpi_battery_exit); 1320