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 #ifdef CONFIG_ACPI_PROCFS_POWER 28 #include <linux/proc_fs.h> 29 #include <linux/seq_file.h> 30 #include <linux/uaccess.h> 31 #endif 32 33 #include <linux/acpi.h> 34 #include <linux/power_supply.h> 35 36 #include <acpi/battery.h> 37 38 #define PREFIX "ACPI: " 39 40 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF 41 #define ACPI_BATTERY_CAPACITY_VALID(capacity) \ 42 ((capacity) != 0 && (capacity) != ACPI_BATTERY_VALUE_UNKNOWN) 43 44 #define ACPI_BATTERY_DEVICE_NAME "Battery" 45 46 /* Battery power unit: 0 means mW, 1 means mA */ 47 #define ACPI_BATTERY_POWER_UNIT_MA 1 48 49 #define ACPI_BATTERY_STATE_DISCHARGING 0x1 50 #define ACPI_BATTERY_STATE_CHARGING 0x2 51 #define ACPI_BATTERY_STATE_CRITICAL 0x4 52 53 #define _COMPONENT ACPI_BATTERY_COMPONENT 54 55 ACPI_MODULE_NAME("battery"); 56 57 MODULE_AUTHOR("Paul Diefenbaugh"); 58 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>"); 59 MODULE_DESCRIPTION("ACPI Battery Driver"); 60 MODULE_LICENSE("GPL"); 61 62 static async_cookie_t async_cookie; 63 static bool battery_driver_registered; 64 static int battery_bix_broken_package; 65 static int battery_notification_delay_ms; 66 static int battery_ac_is_broken; 67 static int battery_check_pmic = 1; 68 static unsigned int cache_time = 1000; 69 module_param(cache_time, uint, 0644); 70 MODULE_PARM_DESC(cache_time, "cache time in milliseconds"); 71 72 #ifdef CONFIG_ACPI_PROCFS_POWER 73 extern struct proc_dir_entry *acpi_lock_battery_dir(void); 74 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir); 75 #endif 76 77 static const struct acpi_device_id battery_device_ids[] = { 78 {"PNP0C0A", 0}, 79 {"", 0}, 80 }; 81 82 MODULE_DEVICE_TABLE(acpi, battery_device_ids); 83 84 /* Lists of PMIC ACPI HIDs with an (often better) native battery driver */ 85 static const char * const acpi_battery_blacklist[] = { 86 "INT33F4", /* X-Powers AXP288 PMIC */ 87 }; 88 89 enum { 90 ACPI_BATTERY_ALARM_PRESENT, 91 ACPI_BATTERY_XINFO_PRESENT, 92 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, 93 /* On Lenovo Thinkpad models from 2010 and 2011, the power unit 94 switches between mWh and mAh depending on whether the system 95 is running on battery or not. When mAh is the unit, most 96 reported values are incorrect and need to be adjusted by 97 10000/design_voltage. Verified on x201, t410, t410s, and x220. 98 Pre-2010 and 2012 models appear to always report in mWh and 99 are thus unaffected (tested with t42, t61, t500, x200, x300, 100 and x230). Also, in mid-2012 Lenovo issued a BIOS update for 101 the 2011 models that fixes the issue (tested on x220 with a 102 post-1.29 BIOS), but as of Nov. 2012, no such update is 103 available for the 2010 models. */ 104 ACPI_BATTERY_QUIRK_THINKPAD_MAH, 105 /* for batteries reporting current capacity with design capacity 106 * on a full charge, but showing degradation in full charge cap. 107 */ 108 ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, 109 }; 110 111 struct acpi_battery { 112 struct mutex lock; 113 struct mutex sysfs_lock; 114 struct power_supply *bat; 115 struct power_supply_desc bat_desc; 116 struct acpi_device *device; 117 struct notifier_block pm_nb; 118 struct list_head list; 119 unsigned long update_time; 120 int revision; 121 int rate_now; 122 int capacity_now; 123 int voltage_now; 124 int design_capacity; 125 int full_charge_capacity; 126 int technology; 127 int design_voltage; 128 int design_capacity_warning; 129 int design_capacity_low; 130 int cycle_count; 131 int measurement_accuracy; 132 int max_sampling_time; 133 int min_sampling_time; 134 int max_averaging_interval; 135 int min_averaging_interval; 136 int capacity_granularity_1; 137 int capacity_granularity_2; 138 int alarm; 139 char model_number[32]; 140 char serial_number[32]; 141 char type[32]; 142 char oem_info[32]; 143 int state; 144 int power_unit; 145 unsigned long flags; 146 }; 147 148 #define to_acpi_battery(x) power_supply_get_drvdata(x) 149 150 static inline int acpi_battery_present(struct acpi_battery *battery) 151 { 152 return battery->device->status.battery_present; 153 } 154 155 static int acpi_battery_technology(struct acpi_battery *battery) 156 { 157 if (!strcasecmp("NiCd", battery->type)) 158 return POWER_SUPPLY_TECHNOLOGY_NiCd; 159 if (!strcasecmp("NiMH", battery->type)) 160 return POWER_SUPPLY_TECHNOLOGY_NiMH; 161 if (!strcasecmp("LION", battery->type)) 162 return POWER_SUPPLY_TECHNOLOGY_LION; 163 if (!strncasecmp("LI-ION", battery->type, 6)) 164 return POWER_SUPPLY_TECHNOLOGY_LION; 165 if (!strcasecmp("LiP", battery->type)) 166 return POWER_SUPPLY_TECHNOLOGY_LIPO; 167 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN; 168 } 169 170 static int acpi_battery_get_state(struct acpi_battery *battery); 171 172 static int acpi_battery_is_charged(struct acpi_battery *battery) 173 { 174 /* charging, discharging or critical low */ 175 if (battery->state != 0) 176 return 0; 177 178 /* battery not reporting charge */ 179 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN || 180 battery->capacity_now == 0) 181 return 0; 182 183 /* good batteries update full_charge as the batteries degrade */ 184 if (battery->full_charge_capacity == battery->capacity_now) 185 return 1; 186 187 /* fallback to using design values for broken batteries */ 188 if (battery->design_capacity == battery->capacity_now) 189 return 1; 190 191 /* we don't do any sort of metric based on percentages */ 192 return 0; 193 } 194 195 static bool acpi_battery_is_degraded(struct acpi_battery *battery) 196 { 197 return ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) && 198 ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity) && 199 battery->full_charge_capacity < battery->design_capacity; 200 } 201 202 static int acpi_battery_handle_discharging(struct acpi_battery *battery) 203 { 204 /* 205 * Some devices wrongly report discharging if the battery's charge level 206 * was above the device's start charging threshold atm the AC adapter 207 * was plugged in and the device thus did not start a new charge cycle. 208 */ 209 if ((battery_ac_is_broken || power_supply_is_system_supplied()) && 210 battery->rate_now == 0) 211 return POWER_SUPPLY_STATUS_NOT_CHARGING; 212 213 return POWER_SUPPLY_STATUS_DISCHARGING; 214 } 215 216 static int acpi_battery_get_property(struct power_supply *psy, 217 enum power_supply_property psp, 218 union power_supply_propval *val) 219 { 220 int full_capacity = ACPI_BATTERY_VALUE_UNKNOWN, ret = 0; 221 struct acpi_battery *battery = to_acpi_battery(psy); 222 223 if (acpi_battery_present(battery)) { 224 /* run battery update only if it is present */ 225 acpi_battery_get_state(battery); 226 } else if (psp != POWER_SUPPLY_PROP_PRESENT) 227 return -ENODEV; 228 switch (psp) { 229 case POWER_SUPPLY_PROP_STATUS: 230 if (battery->state & ACPI_BATTERY_STATE_DISCHARGING) 231 val->intval = acpi_battery_handle_discharging(battery); 232 else if (battery->state & ACPI_BATTERY_STATE_CHARGING) 233 val->intval = POWER_SUPPLY_STATUS_CHARGING; 234 else if (acpi_battery_is_charged(battery)) 235 val->intval = POWER_SUPPLY_STATUS_FULL; 236 else 237 val->intval = POWER_SUPPLY_STATUS_UNKNOWN; 238 break; 239 case POWER_SUPPLY_PROP_PRESENT: 240 val->intval = acpi_battery_present(battery); 241 break; 242 case POWER_SUPPLY_PROP_TECHNOLOGY: 243 val->intval = acpi_battery_technology(battery); 244 break; 245 case POWER_SUPPLY_PROP_CYCLE_COUNT: 246 val->intval = battery->cycle_count; 247 break; 248 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: 249 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN) 250 ret = -ENODEV; 251 else 252 val->intval = battery->design_voltage * 1000; 253 break; 254 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 255 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN) 256 ret = -ENODEV; 257 else 258 val->intval = battery->voltage_now * 1000; 259 break; 260 case POWER_SUPPLY_PROP_CURRENT_NOW: 261 case POWER_SUPPLY_PROP_POWER_NOW: 262 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN) 263 ret = -ENODEV; 264 else 265 val->intval = battery->rate_now * 1000; 266 break; 267 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 268 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: 269 if (!ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) 270 ret = -ENODEV; 271 else 272 val->intval = battery->design_capacity * 1000; 273 break; 274 case POWER_SUPPLY_PROP_CHARGE_FULL: 275 case POWER_SUPPLY_PROP_ENERGY_FULL: 276 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity)) 277 ret = -ENODEV; 278 else 279 val->intval = battery->full_charge_capacity * 1000; 280 break; 281 case POWER_SUPPLY_PROP_CHARGE_NOW: 282 case POWER_SUPPLY_PROP_ENERGY_NOW: 283 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN) 284 ret = -ENODEV; 285 else 286 val->intval = battery->capacity_now * 1000; 287 break; 288 case POWER_SUPPLY_PROP_CAPACITY: 289 if (ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity)) 290 full_capacity = battery->full_charge_capacity; 291 else if (ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) 292 full_capacity = battery->design_capacity; 293 294 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN || 295 full_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 296 ret = -ENODEV; 297 else 298 val->intval = battery->capacity_now * 100/ 299 full_capacity; 300 break; 301 case POWER_SUPPLY_PROP_CAPACITY_LEVEL: 302 if (battery->state & ACPI_BATTERY_STATE_CRITICAL) 303 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL; 304 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) && 305 (battery->capacity_now <= battery->alarm)) 306 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW; 307 else if (acpi_battery_is_charged(battery)) 308 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL; 309 else 310 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; 311 break; 312 case POWER_SUPPLY_PROP_MODEL_NAME: 313 val->strval = battery->model_number; 314 break; 315 case POWER_SUPPLY_PROP_MANUFACTURER: 316 val->strval = battery->oem_info; 317 break; 318 case POWER_SUPPLY_PROP_SERIAL_NUMBER: 319 val->strval = battery->serial_number; 320 break; 321 default: 322 ret = -EINVAL; 323 } 324 return ret; 325 } 326 327 static enum power_supply_property charge_battery_props[] = { 328 POWER_SUPPLY_PROP_STATUS, 329 POWER_SUPPLY_PROP_PRESENT, 330 POWER_SUPPLY_PROP_TECHNOLOGY, 331 POWER_SUPPLY_PROP_CYCLE_COUNT, 332 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 333 POWER_SUPPLY_PROP_VOLTAGE_NOW, 334 POWER_SUPPLY_PROP_CURRENT_NOW, 335 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 336 POWER_SUPPLY_PROP_CHARGE_FULL, 337 POWER_SUPPLY_PROP_CHARGE_NOW, 338 POWER_SUPPLY_PROP_CAPACITY, 339 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 340 POWER_SUPPLY_PROP_MODEL_NAME, 341 POWER_SUPPLY_PROP_MANUFACTURER, 342 POWER_SUPPLY_PROP_SERIAL_NUMBER, 343 }; 344 345 static enum power_supply_property charge_battery_full_cap_broken_props[] = { 346 POWER_SUPPLY_PROP_STATUS, 347 POWER_SUPPLY_PROP_PRESENT, 348 POWER_SUPPLY_PROP_TECHNOLOGY, 349 POWER_SUPPLY_PROP_CYCLE_COUNT, 350 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 351 POWER_SUPPLY_PROP_VOLTAGE_NOW, 352 POWER_SUPPLY_PROP_CURRENT_NOW, 353 POWER_SUPPLY_PROP_CHARGE_NOW, 354 POWER_SUPPLY_PROP_MODEL_NAME, 355 POWER_SUPPLY_PROP_MANUFACTURER, 356 POWER_SUPPLY_PROP_SERIAL_NUMBER, 357 }; 358 359 static enum power_supply_property energy_battery_props[] = { 360 POWER_SUPPLY_PROP_STATUS, 361 POWER_SUPPLY_PROP_PRESENT, 362 POWER_SUPPLY_PROP_TECHNOLOGY, 363 POWER_SUPPLY_PROP_CYCLE_COUNT, 364 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 365 POWER_SUPPLY_PROP_VOLTAGE_NOW, 366 POWER_SUPPLY_PROP_POWER_NOW, 367 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 368 POWER_SUPPLY_PROP_ENERGY_FULL, 369 POWER_SUPPLY_PROP_ENERGY_NOW, 370 POWER_SUPPLY_PROP_CAPACITY, 371 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 372 POWER_SUPPLY_PROP_MODEL_NAME, 373 POWER_SUPPLY_PROP_MANUFACTURER, 374 POWER_SUPPLY_PROP_SERIAL_NUMBER, 375 }; 376 377 static enum power_supply_property energy_battery_full_cap_broken_props[] = { 378 POWER_SUPPLY_PROP_STATUS, 379 POWER_SUPPLY_PROP_PRESENT, 380 POWER_SUPPLY_PROP_TECHNOLOGY, 381 POWER_SUPPLY_PROP_CYCLE_COUNT, 382 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 383 POWER_SUPPLY_PROP_VOLTAGE_NOW, 384 POWER_SUPPLY_PROP_POWER_NOW, 385 POWER_SUPPLY_PROP_ENERGY_NOW, 386 POWER_SUPPLY_PROP_MODEL_NAME, 387 POWER_SUPPLY_PROP_MANUFACTURER, 388 POWER_SUPPLY_PROP_SERIAL_NUMBER, 389 }; 390 391 /* -------------------------------------------------------------------------- 392 Battery Management 393 -------------------------------------------------------------------------- */ 394 struct acpi_offsets { 395 size_t offset; /* offset inside struct acpi_sbs_battery */ 396 u8 mode; /* int or string? */ 397 }; 398 399 static const struct acpi_offsets state_offsets[] = { 400 {offsetof(struct acpi_battery, state), 0}, 401 {offsetof(struct acpi_battery, rate_now), 0}, 402 {offsetof(struct acpi_battery, capacity_now), 0}, 403 {offsetof(struct acpi_battery, voltage_now), 0}, 404 }; 405 406 static const struct acpi_offsets info_offsets[] = { 407 {offsetof(struct acpi_battery, power_unit), 0}, 408 {offsetof(struct acpi_battery, design_capacity), 0}, 409 {offsetof(struct acpi_battery, full_charge_capacity), 0}, 410 {offsetof(struct acpi_battery, technology), 0}, 411 {offsetof(struct acpi_battery, design_voltage), 0}, 412 {offsetof(struct acpi_battery, design_capacity_warning), 0}, 413 {offsetof(struct acpi_battery, design_capacity_low), 0}, 414 {offsetof(struct acpi_battery, capacity_granularity_1), 0}, 415 {offsetof(struct acpi_battery, capacity_granularity_2), 0}, 416 {offsetof(struct acpi_battery, model_number), 1}, 417 {offsetof(struct acpi_battery, serial_number), 1}, 418 {offsetof(struct acpi_battery, type), 1}, 419 {offsetof(struct acpi_battery, oem_info), 1}, 420 }; 421 422 static const struct acpi_offsets extended_info_offsets[] = { 423 {offsetof(struct acpi_battery, revision), 0}, 424 {offsetof(struct acpi_battery, power_unit), 0}, 425 {offsetof(struct acpi_battery, design_capacity), 0}, 426 {offsetof(struct acpi_battery, full_charge_capacity), 0}, 427 {offsetof(struct acpi_battery, technology), 0}, 428 {offsetof(struct acpi_battery, design_voltage), 0}, 429 {offsetof(struct acpi_battery, design_capacity_warning), 0}, 430 {offsetof(struct acpi_battery, design_capacity_low), 0}, 431 {offsetof(struct acpi_battery, cycle_count), 0}, 432 {offsetof(struct acpi_battery, measurement_accuracy), 0}, 433 {offsetof(struct acpi_battery, max_sampling_time), 0}, 434 {offsetof(struct acpi_battery, min_sampling_time), 0}, 435 {offsetof(struct acpi_battery, max_averaging_interval), 0}, 436 {offsetof(struct acpi_battery, min_averaging_interval), 0}, 437 {offsetof(struct acpi_battery, capacity_granularity_1), 0}, 438 {offsetof(struct acpi_battery, capacity_granularity_2), 0}, 439 {offsetof(struct acpi_battery, model_number), 1}, 440 {offsetof(struct acpi_battery, serial_number), 1}, 441 {offsetof(struct acpi_battery, type), 1}, 442 {offsetof(struct acpi_battery, oem_info), 1}, 443 }; 444 445 static int extract_package(struct acpi_battery *battery, 446 union acpi_object *package, 447 const struct acpi_offsets *offsets, int num) 448 { 449 int i; 450 union acpi_object *element; 451 if (package->type != ACPI_TYPE_PACKAGE) 452 return -EFAULT; 453 for (i = 0; i < num; ++i) { 454 if (package->package.count <= i) 455 return -EFAULT; 456 element = &package->package.elements[i]; 457 if (offsets[i].mode) { 458 u8 *ptr = (u8 *)battery + offsets[i].offset; 459 if (element->type == ACPI_TYPE_STRING || 460 element->type == ACPI_TYPE_BUFFER) 461 strncpy(ptr, element->string.pointer, 32); 462 else if (element->type == ACPI_TYPE_INTEGER) { 463 strncpy(ptr, (u8 *)&element->integer.value, 464 sizeof(u64)); 465 ptr[sizeof(u64)] = 0; 466 } else 467 *ptr = 0; /* don't have value */ 468 } else { 469 int *x = (int *)((u8 *)battery + offsets[i].offset); 470 *x = (element->type == ACPI_TYPE_INTEGER) ? 471 element->integer.value : -1; 472 } 473 } 474 return 0; 475 } 476 477 static int acpi_battery_get_status(struct acpi_battery *battery) 478 { 479 if (acpi_bus_get_status(battery->device)) { 480 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA")); 481 return -ENODEV; 482 } 483 return 0; 484 } 485 486 487 static int extract_battery_info(const int use_bix, 488 struct acpi_battery *battery, 489 const struct acpi_buffer *buffer) 490 { 491 int result = -EFAULT; 492 493 if (use_bix && battery_bix_broken_package) 494 result = extract_package(battery, buffer->pointer, 495 extended_info_offsets + 1, 496 ARRAY_SIZE(extended_info_offsets) - 1); 497 else if (use_bix) 498 result = extract_package(battery, buffer->pointer, 499 extended_info_offsets, 500 ARRAY_SIZE(extended_info_offsets)); 501 else 502 result = extract_package(battery, buffer->pointer, 503 info_offsets, ARRAY_SIZE(info_offsets)); 504 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) 505 battery->full_charge_capacity = battery->design_capacity; 506 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) && 507 battery->power_unit && battery->design_voltage) { 508 battery->design_capacity = battery->design_capacity * 509 10000 / battery->design_voltage; 510 battery->full_charge_capacity = battery->full_charge_capacity * 511 10000 / battery->design_voltage; 512 battery->design_capacity_warning = 513 battery->design_capacity_warning * 514 10000 / battery->design_voltage; 515 /* Curiously, design_capacity_low, unlike the rest of them, 516 is correct. */ 517 /* capacity_granularity_* equal 1 on the systems tested, so 518 it's impossible to tell if they would need an adjustment 519 or not if their values were higher. */ 520 } 521 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) && 522 battery->capacity_now > battery->full_charge_capacity) 523 battery->capacity_now = battery->full_charge_capacity; 524 525 return result; 526 } 527 528 static int acpi_battery_get_info(struct acpi_battery *battery) 529 { 530 const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags); 531 int use_bix; 532 int result = -ENODEV; 533 534 if (!acpi_battery_present(battery)) 535 return 0; 536 537 538 for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) { 539 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 540 acpi_status status = AE_ERROR; 541 542 mutex_lock(&battery->lock); 543 status = acpi_evaluate_object(battery->device->handle, 544 use_bix ? "_BIX":"_BIF", 545 NULL, &buffer); 546 mutex_unlock(&battery->lock); 547 548 if (ACPI_FAILURE(status)) { 549 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", 550 use_bix ? "_BIX":"_BIF")); 551 } else { 552 result = extract_battery_info(use_bix, 553 battery, 554 &buffer); 555 556 kfree(buffer.pointer); 557 break; 558 } 559 } 560 561 if (!result && !use_bix && xinfo) 562 pr_warn(FW_BUG "The _BIX method is broken, using _BIF.\n"); 563 564 return result; 565 } 566 567 static int acpi_battery_get_state(struct acpi_battery *battery) 568 { 569 int result = 0; 570 acpi_status status = 0; 571 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 572 573 if (!acpi_battery_present(battery)) 574 return 0; 575 576 if (battery->update_time && 577 time_before(jiffies, battery->update_time + 578 msecs_to_jiffies(cache_time))) 579 return 0; 580 581 mutex_lock(&battery->lock); 582 status = acpi_evaluate_object(battery->device->handle, "_BST", 583 NULL, &buffer); 584 mutex_unlock(&battery->lock); 585 586 if (ACPI_FAILURE(status)) { 587 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST")); 588 return -ENODEV; 589 } 590 591 result = extract_package(battery, buffer.pointer, 592 state_offsets, ARRAY_SIZE(state_offsets)); 593 battery->update_time = jiffies; 594 kfree(buffer.pointer); 595 596 /* For buggy DSDTs that report negative 16-bit values for either 597 * charging or discharging current and/or report 0 as 65536 598 * due to bad math. 599 */ 600 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA && 601 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN && 602 (s16)(battery->rate_now) < 0) { 603 battery->rate_now = abs((s16)battery->rate_now); 604 pr_warn_once(FW_BUG "battery: (dis)charge rate invalid.\n"); 605 } 606 607 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags) 608 && battery->capacity_now >= 0 && battery->capacity_now <= 100) 609 battery->capacity_now = (battery->capacity_now * 610 battery->full_charge_capacity) / 100; 611 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) && 612 battery->power_unit && battery->design_voltage) { 613 battery->capacity_now = battery->capacity_now * 614 10000 / battery->design_voltage; 615 } 616 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) && 617 battery->capacity_now > battery->full_charge_capacity) 618 battery->capacity_now = battery->full_charge_capacity; 619 620 return result; 621 } 622 623 static int acpi_battery_set_alarm(struct acpi_battery *battery) 624 { 625 acpi_status status = 0; 626 627 if (!acpi_battery_present(battery) || 628 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags)) 629 return -ENODEV; 630 631 mutex_lock(&battery->lock); 632 status = acpi_execute_simple_method(battery->device->handle, "_BTP", 633 battery->alarm); 634 mutex_unlock(&battery->lock); 635 636 if (ACPI_FAILURE(status)) 637 return -ENODEV; 638 639 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm)); 640 return 0; 641 } 642 643 static int acpi_battery_init_alarm(struct acpi_battery *battery) 644 { 645 /* See if alarms are supported, and if so, set default */ 646 if (!acpi_has_method(battery->device->handle, "_BTP")) { 647 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags); 648 return 0; 649 } 650 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags); 651 if (!battery->alarm) 652 battery->alarm = battery->design_capacity_warning; 653 return acpi_battery_set_alarm(battery); 654 } 655 656 static ssize_t acpi_battery_alarm_show(struct device *dev, 657 struct device_attribute *attr, 658 char *buf) 659 { 660 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 661 return sprintf(buf, "%d\n", battery->alarm * 1000); 662 } 663 664 static ssize_t acpi_battery_alarm_store(struct device *dev, 665 struct device_attribute *attr, 666 const char *buf, size_t count) 667 { 668 unsigned long x; 669 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 670 if (sscanf(buf, "%lu\n", &x) == 1) 671 battery->alarm = x/1000; 672 if (acpi_battery_present(battery)) 673 acpi_battery_set_alarm(battery); 674 return count; 675 } 676 677 static const struct device_attribute alarm_attr = { 678 .attr = {.name = "alarm", .mode = 0644}, 679 .show = acpi_battery_alarm_show, 680 .store = acpi_battery_alarm_store, 681 }; 682 683 /* 684 * The Battery Hooking API 685 * 686 * This API is used inside other drivers that need to expose 687 * platform-specific behaviour within the generic driver in a 688 * generic way. 689 * 690 */ 691 692 static LIST_HEAD(acpi_battery_list); 693 static LIST_HEAD(battery_hook_list); 694 static DEFINE_MUTEX(hook_mutex); 695 696 static void __battery_hook_unregister(struct acpi_battery_hook *hook, int lock) 697 { 698 struct acpi_battery *battery; 699 /* 700 * In order to remove a hook, we first need to 701 * de-register all the batteries that are registered. 702 */ 703 if (lock) 704 mutex_lock(&hook_mutex); 705 list_for_each_entry(battery, &acpi_battery_list, list) { 706 hook->remove_battery(battery->bat); 707 } 708 list_del(&hook->list); 709 if (lock) 710 mutex_unlock(&hook_mutex); 711 pr_info("extension unregistered: %s\n", hook->name); 712 } 713 714 void battery_hook_unregister(struct acpi_battery_hook *hook) 715 { 716 __battery_hook_unregister(hook, 1); 717 } 718 EXPORT_SYMBOL_GPL(battery_hook_unregister); 719 720 void battery_hook_register(struct acpi_battery_hook *hook) 721 { 722 struct acpi_battery *battery; 723 724 mutex_lock(&hook_mutex); 725 INIT_LIST_HEAD(&hook->list); 726 list_add(&hook->list, &battery_hook_list); 727 /* 728 * Now that the driver is registered, we need 729 * to notify the hook that a battery is available 730 * for each battery, so that the driver may add 731 * its attributes. 732 */ 733 list_for_each_entry(battery, &acpi_battery_list, list) { 734 if (hook->add_battery(battery->bat)) { 735 /* 736 * If a add-battery returns non-zero, 737 * the registration of the extension has failed, 738 * and we will not add it to the list of loaded 739 * hooks. 740 */ 741 pr_err("extension failed to load: %s", hook->name); 742 __battery_hook_unregister(hook, 0); 743 goto end; 744 } 745 } 746 pr_info("new extension: %s\n", hook->name); 747 end: 748 mutex_unlock(&hook_mutex); 749 } 750 EXPORT_SYMBOL_GPL(battery_hook_register); 751 752 /* 753 * This function gets called right after the battery sysfs 754 * attributes have been added, so that the drivers that 755 * define custom sysfs attributes can add their own. 756 */ 757 static void battery_hook_add_battery(struct acpi_battery *battery) 758 { 759 struct acpi_battery_hook *hook_node, *tmp; 760 761 mutex_lock(&hook_mutex); 762 INIT_LIST_HEAD(&battery->list); 763 list_add(&battery->list, &acpi_battery_list); 764 /* 765 * Since we added a new battery to the list, we need to 766 * iterate over the hooks and call add_battery for each 767 * hook that was registered. This usually happens 768 * when a battery gets hotplugged or initialized 769 * during the battery module initialization. 770 */ 771 list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) { 772 if (hook_node->add_battery(battery->bat)) { 773 /* 774 * The notification of the extensions has failed, to 775 * prevent further errors we will unload the extension. 776 */ 777 pr_err("error in extension, unloading: %s", 778 hook_node->name); 779 __battery_hook_unregister(hook_node, 0); 780 } 781 } 782 mutex_unlock(&hook_mutex); 783 } 784 785 static void battery_hook_remove_battery(struct acpi_battery *battery) 786 { 787 struct acpi_battery_hook *hook; 788 789 mutex_lock(&hook_mutex); 790 /* 791 * Before removing the hook, we need to remove all 792 * custom attributes from the battery. 793 */ 794 list_for_each_entry(hook, &battery_hook_list, list) { 795 hook->remove_battery(battery->bat); 796 } 797 /* Then, just remove the battery from the list */ 798 list_del(&battery->list); 799 mutex_unlock(&hook_mutex); 800 } 801 802 static void __exit battery_hook_exit(void) 803 { 804 struct acpi_battery_hook *hook; 805 struct acpi_battery_hook *ptr; 806 /* 807 * At this point, the acpi_bus_unregister_driver() 808 * has called remove for all batteries. We just 809 * need to remove the hooks. 810 */ 811 list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) { 812 __battery_hook_unregister(hook, 1); 813 } 814 mutex_destroy(&hook_mutex); 815 } 816 817 static int sysfs_add_battery(struct acpi_battery *battery) 818 { 819 struct power_supply_config psy_cfg = { .drv_data = battery, }; 820 bool full_cap_broken = false; 821 822 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) && 823 !ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) 824 full_cap_broken = true; 825 826 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) { 827 if (full_cap_broken) { 828 battery->bat_desc.properties = 829 charge_battery_full_cap_broken_props; 830 battery->bat_desc.num_properties = 831 ARRAY_SIZE(charge_battery_full_cap_broken_props); 832 } else { 833 battery->bat_desc.properties = charge_battery_props; 834 battery->bat_desc.num_properties = 835 ARRAY_SIZE(charge_battery_props); 836 } 837 } else { 838 if (full_cap_broken) { 839 battery->bat_desc.properties = 840 energy_battery_full_cap_broken_props; 841 battery->bat_desc.num_properties = 842 ARRAY_SIZE(energy_battery_full_cap_broken_props); 843 } else { 844 battery->bat_desc.properties = energy_battery_props; 845 battery->bat_desc.num_properties = 846 ARRAY_SIZE(energy_battery_props); 847 } 848 } 849 850 battery->bat_desc.name = acpi_device_bid(battery->device); 851 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY; 852 battery->bat_desc.get_property = acpi_battery_get_property; 853 854 battery->bat = power_supply_register_no_ws(&battery->device->dev, 855 &battery->bat_desc, &psy_cfg); 856 857 if (IS_ERR(battery->bat)) { 858 int result = PTR_ERR(battery->bat); 859 860 battery->bat = NULL; 861 return result; 862 } 863 battery_hook_add_battery(battery); 864 return device_create_file(&battery->bat->dev, &alarm_attr); 865 } 866 867 static void sysfs_remove_battery(struct acpi_battery *battery) 868 { 869 mutex_lock(&battery->sysfs_lock); 870 if (!battery->bat) { 871 mutex_unlock(&battery->sysfs_lock); 872 return; 873 } 874 battery_hook_remove_battery(battery); 875 device_remove_file(&battery->bat->dev, &alarm_attr); 876 power_supply_unregister(battery->bat); 877 battery->bat = NULL; 878 mutex_unlock(&battery->sysfs_lock); 879 } 880 881 static void find_battery(const struct dmi_header *dm, void *private) 882 { 883 struct acpi_battery *battery = (struct acpi_battery *)private; 884 /* Note: the hardcoded offsets below have been extracted from 885 the source code of dmidecode. */ 886 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) { 887 const u8 *dmi_data = (const u8 *)(dm + 1); 888 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6)); 889 if (dm->length >= 18) 890 dmi_capacity *= dmi_data[17]; 891 if (battery->design_capacity * battery->design_voltage / 1000 892 != dmi_capacity && 893 battery->design_capacity * 10 == dmi_capacity) 894 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, 895 &battery->flags); 896 } 897 } 898 899 /* 900 * According to the ACPI spec, some kinds of primary batteries can 901 * report percentage battery remaining capacity directly to OS. 902 * In this case, it reports the Last Full Charged Capacity == 100 903 * and BatteryPresentRate == 0xFFFFFFFF. 904 * 905 * Now we found some battery reports percentage remaining capacity 906 * even if it's rechargeable. 907 * https://bugzilla.kernel.org/show_bug.cgi?id=15979 908 * 909 * Handle this correctly so that they won't break userspace. 910 */ 911 static void acpi_battery_quirks(struct acpi_battery *battery) 912 { 913 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) 914 return; 915 916 if (battery->full_charge_capacity == 100 && 917 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN && 918 battery->capacity_now >= 0 && battery->capacity_now <= 100) { 919 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags); 920 battery->full_charge_capacity = battery->design_capacity; 921 battery->capacity_now = (battery->capacity_now * 922 battery->full_charge_capacity) / 100; 923 } 924 925 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags)) 926 return; 927 928 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) { 929 const char *s; 930 s = dmi_get_system_info(DMI_PRODUCT_VERSION); 931 if (s && !strncasecmp(s, "ThinkPad", 8)) { 932 dmi_walk(find_battery, battery); 933 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, 934 &battery->flags) && 935 battery->design_voltage) { 936 battery->design_capacity = 937 battery->design_capacity * 938 10000 / battery->design_voltage; 939 battery->full_charge_capacity = 940 battery->full_charge_capacity * 941 10000 / battery->design_voltage; 942 battery->design_capacity_warning = 943 battery->design_capacity_warning * 944 10000 / battery->design_voltage; 945 battery->capacity_now = battery->capacity_now * 946 10000 / battery->design_voltage; 947 } 948 } 949 } 950 951 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags)) 952 return; 953 954 if (acpi_battery_is_degraded(battery) && 955 battery->capacity_now > battery->full_charge_capacity) { 956 set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags); 957 battery->capacity_now = battery->full_charge_capacity; 958 } 959 } 960 961 static int acpi_battery_update(struct acpi_battery *battery, bool resume) 962 { 963 int result = acpi_battery_get_status(battery); 964 965 if (result) 966 return result; 967 968 if (!acpi_battery_present(battery)) { 969 sysfs_remove_battery(battery); 970 battery->update_time = 0; 971 return 0; 972 } 973 974 if (resume) 975 return 0; 976 977 if (!battery->update_time) { 978 result = acpi_battery_get_info(battery); 979 if (result) 980 return result; 981 acpi_battery_init_alarm(battery); 982 } 983 984 result = acpi_battery_get_state(battery); 985 if (result) 986 return result; 987 acpi_battery_quirks(battery); 988 989 if (!battery->bat) { 990 result = sysfs_add_battery(battery); 991 if (result) 992 return result; 993 } 994 995 /* 996 * Wakeup the system if battery is critical low 997 * or lower than the alarm level 998 */ 999 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) || 1000 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) && 1001 (battery->capacity_now <= battery->alarm))) 1002 acpi_pm_wakeup_event(&battery->device->dev); 1003 1004 return result; 1005 } 1006 1007 static void acpi_battery_refresh(struct acpi_battery *battery) 1008 { 1009 int power_unit; 1010 1011 if (!battery->bat) 1012 return; 1013 1014 power_unit = battery->power_unit; 1015 1016 acpi_battery_get_info(battery); 1017 1018 if (power_unit == battery->power_unit) 1019 return; 1020 1021 /* The battery has changed its reporting units. */ 1022 sysfs_remove_battery(battery); 1023 sysfs_add_battery(battery); 1024 } 1025 1026 /* -------------------------------------------------------------------------- 1027 FS Interface (/proc) 1028 -------------------------------------------------------------------------- */ 1029 1030 #ifdef CONFIG_ACPI_PROCFS_POWER 1031 static struct proc_dir_entry *acpi_battery_dir; 1032 1033 static const char *acpi_battery_units(const struct acpi_battery *battery) 1034 { 1035 return (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) ? 1036 "mA" : "mW"; 1037 } 1038 1039 static int acpi_battery_info_proc_show(struct seq_file *seq, void *offset) 1040 { 1041 struct acpi_battery *battery = seq->private; 1042 int result = acpi_battery_update(battery, false); 1043 1044 if (result) 1045 goto end; 1046 1047 seq_printf(seq, "present: %s\n", 1048 acpi_battery_present(battery) ? "yes" : "no"); 1049 if (!acpi_battery_present(battery)) 1050 goto end; 1051 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 1052 seq_printf(seq, "design capacity: unknown\n"); 1053 else 1054 seq_printf(seq, "design capacity: %d %sh\n", 1055 battery->design_capacity, 1056 acpi_battery_units(battery)); 1057 1058 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 1059 seq_printf(seq, "last full capacity: unknown\n"); 1060 else 1061 seq_printf(seq, "last full capacity: %d %sh\n", 1062 battery->full_charge_capacity, 1063 acpi_battery_units(battery)); 1064 1065 seq_printf(seq, "battery technology: %srechargeable\n", 1066 battery->technology ? "" : "non-"); 1067 1068 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN) 1069 seq_printf(seq, "design voltage: unknown\n"); 1070 else 1071 seq_printf(seq, "design voltage: %d mV\n", 1072 battery->design_voltage); 1073 seq_printf(seq, "design capacity warning: %d %sh\n", 1074 battery->design_capacity_warning, 1075 acpi_battery_units(battery)); 1076 seq_printf(seq, "design capacity low: %d %sh\n", 1077 battery->design_capacity_low, 1078 acpi_battery_units(battery)); 1079 seq_printf(seq, "cycle count: %i\n", battery->cycle_count); 1080 seq_printf(seq, "capacity granularity 1: %d %sh\n", 1081 battery->capacity_granularity_1, 1082 acpi_battery_units(battery)); 1083 seq_printf(seq, "capacity granularity 2: %d %sh\n", 1084 battery->capacity_granularity_2, 1085 acpi_battery_units(battery)); 1086 seq_printf(seq, "model number: %s\n", battery->model_number); 1087 seq_printf(seq, "serial number: %s\n", battery->serial_number); 1088 seq_printf(seq, "battery type: %s\n", battery->type); 1089 seq_printf(seq, "OEM info: %s\n", battery->oem_info); 1090 end: 1091 if (result) 1092 seq_printf(seq, "ERROR: Unable to read battery info\n"); 1093 return result; 1094 } 1095 1096 static int acpi_battery_state_proc_show(struct seq_file *seq, void *offset) 1097 { 1098 struct acpi_battery *battery = seq->private; 1099 int result = acpi_battery_update(battery, false); 1100 1101 if (result) 1102 goto end; 1103 1104 seq_printf(seq, "present: %s\n", 1105 acpi_battery_present(battery) ? "yes" : "no"); 1106 if (!acpi_battery_present(battery)) 1107 goto end; 1108 1109 seq_printf(seq, "capacity state: %s\n", 1110 (battery->state & 0x04) ? "critical" : "ok"); 1111 if ((battery->state & 0x01) && (battery->state & 0x02)) 1112 seq_printf(seq, 1113 "charging state: charging/discharging\n"); 1114 else if (battery->state & 0x01) 1115 seq_printf(seq, "charging state: discharging\n"); 1116 else if (battery->state & 0x02) 1117 seq_printf(seq, "charging state: charging\n"); 1118 else 1119 seq_printf(seq, "charging state: charged\n"); 1120 1121 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN) 1122 seq_printf(seq, "present rate: unknown\n"); 1123 else 1124 seq_printf(seq, "present rate: %d %s\n", 1125 battery->rate_now, acpi_battery_units(battery)); 1126 1127 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN) 1128 seq_printf(seq, "remaining capacity: unknown\n"); 1129 else 1130 seq_printf(seq, "remaining capacity: %d %sh\n", 1131 battery->capacity_now, acpi_battery_units(battery)); 1132 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN) 1133 seq_printf(seq, "present voltage: unknown\n"); 1134 else 1135 seq_printf(seq, "present voltage: %d mV\n", 1136 battery->voltage_now); 1137 end: 1138 if (result) 1139 seq_printf(seq, "ERROR: Unable to read battery state\n"); 1140 1141 return result; 1142 } 1143 1144 static int acpi_battery_alarm_proc_show(struct seq_file *seq, void *offset) 1145 { 1146 struct acpi_battery *battery = seq->private; 1147 int result = acpi_battery_update(battery, false); 1148 1149 if (result) 1150 goto end; 1151 1152 if (!acpi_battery_present(battery)) { 1153 seq_printf(seq, "present: no\n"); 1154 goto end; 1155 } 1156 seq_printf(seq, "alarm: "); 1157 if (battery->alarm) { 1158 seq_printf(seq, "%u %sh\n", battery->alarm, 1159 acpi_battery_units(battery)); 1160 } else { 1161 seq_printf(seq, "unsupported\n"); 1162 } 1163 end: 1164 if (result) 1165 seq_printf(seq, "ERROR: Unable to read battery alarm\n"); 1166 return result; 1167 } 1168 1169 static ssize_t acpi_battery_write_alarm(struct file *file, 1170 const char __user * buffer, 1171 size_t count, loff_t * ppos) 1172 { 1173 int result = 0; 1174 char alarm_string[12] = { '\0' }; 1175 struct seq_file *m = file->private_data; 1176 struct acpi_battery *battery = m->private; 1177 1178 if (!battery || (count > sizeof(alarm_string) - 1)) 1179 return -EINVAL; 1180 if (!acpi_battery_present(battery)) { 1181 result = -ENODEV; 1182 goto end; 1183 } 1184 if (copy_from_user(alarm_string, buffer, count)) { 1185 result = -EFAULT; 1186 goto end; 1187 } 1188 alarm_string[count] = '\0'; 1189 if (kstrtoint(alarm_string, 0, &battery->alarm)) { 1190 result = -EINVAL; 1191 goto end; 1192 } 1193 result = acpi_battery_set_alarm(battery); 1194 end: 1195 if (result) 1196 return result; 1197 return count; 1198 } 1199 1200 static int acpi_battery_alarm_proc_open(struct inode *inode, struct file *file) 1201 { 1202 return single_open(file, acpi_battery_alarm_proc_show, PDE_DATA(inode)); 1203 } 1204 1205 static const struct proc_ops acpi_battery_alarm_proc_ops = { 1206 .proc_open = acpi_battery_alarm_proc_open, 1207 .proc_read = seq_read, 1208 .proc_write = acpi_battery_write_alarm, 1209 .proc_lseek = seq_lseek, 1210 .proc_release = single_release, 1211 }; 1212 1213 static int acpi_battery_add_fs(struct acpi_device *device) 1214 { 1215 pr_warn(PREFIX "Deprecated procfs I/F for battery is loaded, please retry with CONFIG_ACPI_PROCFS_POWER cleared\n"); 1216 if (!acpi_device_dir(device)) { 1217 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 1218 acpi_battery_dir); 1219 if (!acpi_device_dir(device)) 1220 return -ENODEV; 1221 } 1222 1223 if (!proc_create_single_data("info", S_IRUGO, acpi_device_dir(device), 1224 acpi_battery_info_proc_show, acpi_driver_data(device))) 1225 return -ENODEV; 1226 if (!proc_create_single_data("state", S_IRUGO, acpi_device_dir(device), 1227 acpi_battery_state_proc_show, acpi_driver_data(device))) 1228 return -ENODEV; 1229 if (!proc_create_data("alarm", S_IFREG | S_IRUGO | S_IWUSR, 1230 acpi_device_dir(device), &acpi_battery_alarm_proc_ops, 1231 acpi_driver_data(device))) 1232 return -ENODEV; 1233 return 0; 1234 } 1235 1236 static void acpi_battery_remove_fs(struct acpi_device *device) 1237 { 1238 if (!acpi_device_dir(device)) 1239 return; 1240 remove_proc_subtree(acpi_device_bid(device), acpi_battery_dir); 1241 acpi_device_dir(device) = NULL; 1242 } 1243 1244 #endif 1245 1246 /* -------------------------------------------------------------------------- 1247 Driver Interface 1248 -------------------------------------------------------------------------- */ 1249 1250 static void acpi_battery_notify(struct acpi_device *device, u32 event) 1251 { 1252 struct acpi_battery *battery = acpi_driver_data(device); 1253 struct power_supply *old; 1254 1255 if (!battery) 1256 return; 1257 old = battery->bat; 1258 /* 1259 * On Acer Aspire V5-573G notifications are sometimes triggered too 1260 * early. For example, when AC is unplugged and notification is 1261 * triggered, battery state is still reported as "Full", and changes to 1262 * "Discharging" only after short delay, without any notification. 1263 */ 1264 if (battery_notification_delay_ms > 0) 1265 msleep(battery_notification_delay_ms); 1266 if (event == ACPI_BATTERY_NOTIFY_INFO) 1267 acpi_battery_refresh(battery); 1268 acpi_battery_update(battery, false); 1269 acpi_bus_generate_netlink_event(device->pnp.device_class, 1270 dev_name(&device->dev), event, 1271 acpi_battery_present(battery)); 1272 acpi_notifier_call_chain(device, event, acpi_battery_present(battery)); 1273 /* acpi_battery_update could remove power_supply object */ 1274 if (old && battery->bat) 1275 power_supply_changed(battery->bat); 1276 } 1277 1278 static int battery_notify(struct notifier_block *nb, 1279 unsigned long mode, void *_unused) 1280 { 1281 struct acpi_battery *battery = container_of(nb, struct acpi_battery, 1282 pm_nb); 1283 int result; 1284 1285 switch (mode) { 1286 case PM_POST_HIBERNATION: 1287 case PM_POST_SUSPEND: 1288 if (!acpi_battery_present(battery)) 1289 return 0; 1290 1291 if (battery->bat) { 1292 acpi_battery_refresh(battery); 1293 } else { 1294 result = acpi_battery_get_info(battery); 1295 if (result) 1296 return result; 1297 1298 result = sysfs_add_battery(battery); 1299 if (result) 1300 return result; 1301 } 1302 1303 acpi_battery_init_alarm(battery); 1304 acpi_battery_get_state(battery); 1305 break; 1306 } 1307 1308 return 0; 1309 } 1310 1311 static int __init 1312 battery_bix_broken_package_quirk(const struct dmi_system_id *d) 1313 { 1314 battery_bix_broken_package = 1; 1315 return 0; 1316 } 1317 1318 static int __init 1319 battery_notification_delay_quirk(const struct dmi_system_id *d) 1320 { 1321 battery_notification_delay_ms = 1000; 1322 return 0; 1323 } 1324 1325 static int __init 1326 battery_ac_is_broken_quirk(const struct dmi_system_id *d) 1327 { 1328 battery_ac_is_broken = 1; 1329 return 0; 1330 } 1331 1332 static int __init 1333 battery_do_not_check_pmic_quirk(const struct dmi_system_id *d) 1334 { 1335 battery_check_pmic = 0; 1336 return 0; 1337 } 1338 1339 static const struct dmi_system_id bat_dmi_table[] __initconst = { 1340 { 1341 /* NEC LZ750/LS */ 1342 .callback = battery_bix_broken_package_quirk, 1343 .matches = { 1344 DMI_MATCH(DMI_SYS_VENDOR, "NEC"), 1345 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"), 1346 }, 1347 }, 1348 { 1349 /* Acer Aspire V5-573G */ 1350 .callback = battery_notification_delay_quirk, 1351 .matches = { 1352 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 1353 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"), 1354 }, 1355 }, 1356 { 1357 /* Point of View mobii wintab p800w */ 1358 .callback = battery_ac_is_broken_quirk, 1359 .matches = { 1360 DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"), 1361 DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"), 1362 DMI_MATCH(DMI_BIOS_VERSION, "3BAIR1013"), 1363 /* Above matches are too generic, add bios-date match */ 1364 DMI_MATCH(DMI_BIOS_DATE, "08/22/2014"), 1365 }, 1366 }, 1367 { 1368 /* ECS EF20EA, AXP288 PMIC but uses separate fuel-gauge */ 1369 .callback = battery_do_not_check_pmic_quirk, 1370 .matches = { 1371 DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"), 1372 }, 1373 }, 1374 { 1375 /* Lenovo Ideapad Miix 320, AXP288 PMIC, separate fuel-gauge */ 1376 .callback = battery_do_not_check_pmic_quirk, 1377 .matches = { 1378 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 1379 DMI_MATCH(DMI_PRODUCT_NAME, "80XF"), 1380 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"), 1381 }, 1382 }, 1383 {}, 1384 }; 1385 1386 /* 1387 * Some machines'(E,G Lenovo Z480) ECs are not stable 1388 * during boot up and this causes battery driver fails to be 1389 * probed due to failure of getting battery information 1390 * from EC sometimes. After several retries, the operation 1391 * may work. So add retry code here and 20ms sleep between 1392 * every retries. 1393 */ 1394 static int acpi_battery_update_retry(struct acpi_battery *battery) 1395 { 1396 int retry, ret; 1397 1398 for (retry = 5; retry; retry--) { 1399 ret = acpi_battery_update(battery, false); 1400 if (!ret) 1401 break; 1402 1403 msleep(20); 1404 } 1405 return ret; 1406 } 1407 1408 static int acpi_battery_add(struct acpi_device *device) 1409 { 1410 int result = 0; 1411 struct acpi_battery *battery = NULL; 1412 1413 if (!device) 1414 return -EINVAL; 1415 1416 if (device->dep_unmet) 1417 return -EPROBE_DEFER; 1418 1419 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL); 1420 if (!battery) 1421 return -ENOMEM; 1422 battery->device = device; 1423 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME); 1424 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS); 1425 device->driver_data = battery; 1426 mutex_init(&battery->lock); 1427 mutex_init(&battery->sysfs_lock); 1428 if (acpi_has_method(battery->device->handle, "_BIX")) 1429 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags); 1430 1431 result = acpi_battery_update_retry(battery); 1432 if (result) 1433 goto fail; 1434 1435 #ifdef CONFIG_ACPI_PROCFS_POWER 1436 result = acpi_battery_add_fs(device); 1437 if (result) { 1438 acpi_battery_remove_fs(device); 1439 goto fail; 1440 } 1441 #endif 1442 1443 pr_info(PREFIX "%s Slot [%s] (battery %s)\n", 1444 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device), 1445 device->status.battery_present ? "present" : "absent"); 1446 1447 battery->pm_nb.notifier_call = battery_notify; 1448 register_pm_notifier(&battery->pm_nb); 1449 1450 device_init_wakeup(&device->dev, 1); 1451 1452 return result; 1453 1454 fail: 1455 sysfs_remove_battery(battery); 1456 mutex_destroy(&battery->lock); 1457 mutex_destroy(&battery->sysfs_lock); 1458 kfree(battery); 1459 return result; 1460 } 1461 1462 static int acpi_battery_remove(struct acpi_device *device) 1463 { 1464 struct acpi_battery *battery = NULL; 1465 1466 if (!device || !acpi_driver_data(device)) 1467 return -EINVAL; 1468 device_init_wakeup(&device->dev, 0); 1469 battery = acpi_driver_data(device); 1470 unregister_pm_notifier(&battery->pm_nb); 1471 #ifdef CONFIG_ACPI_PROCFS_POWER 1472 acpi_battery_remove_fs(device); 1473 #endif 1474 sysfs_remove_battery(battery); 1475 mutex_destroy(&battery->lock); 1476 mutex_destroy(&battery->sysfs_lock); 1477 kfree(battery); 1478 return 0; 1479 } 1480 1481 #ifdef CONFIG_PM_SLEEP 1482 /* this is needed to learn about changes made in suspended state */ 1483 static int acpi_battery_resume(struct device *dev) 1484 { 1485 struct acpi_battery *battery; 1486 1487 if (!dev) 1488 return -EINVAL; 1489 1490 battery = acpi_driver_data(to_acpi_device(dev)); 1491 if (!battery) 1492 return -EINVAL; 1493 1494 battery->update_time = 0; 1495 acpi_battery_update(battery, true); 1496 return 0; 1497 } 1498 #else 1499 #define acpi_battery_resume NULL 1500 #endif 1501 1502 static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume); 1503 1504 static struct acpi_driver acpi_battery_driver = { 1505 .name = "battery", 1506 .class = ACPI_BATTERY_CLASS, 1507 .ids = battery_device_ids, 1508 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS, 1509 .ops = { 1510 .add = acpi_battery_add, 1511 .remove = acpi_battery_remove, 1512 .notify = acpi_battery_notify, 1513 }, 1514 .drv.pm = &acpi_battery_pm, 1515 }; 1516 1517 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie) 1518 { 1519 unsigned int i; 1520 int result; 1521 1522 dmi_check_system(bat_dmi_table); 1523 1524 if (battery_check_pmic) { 1525 for (i = 0; i < ARRAY_SIZE(acpi_battery_blacklist); i++) 1526 if (acpi_dev_present(acpi_battery_blacklist[i], "1", -1)) { 1527 pr_info(PREFIX ACPI_BATTERY_DEVICE_NAME 1528 ": found native %s PMIC, not loading\n", 1529 acpi_battery_blacklist[i]); 1530 return; 1531 } 1532 } 1533 1534 #ifdef CONFIG_ACPI_PROCFS_POWER 1535 acpi_battery_dir = acpi_lock_battery_dir(); 1536 if (!acpi_battery_dir) 1537 return; 1538 #endif 1539 result = acpi_bus_register_driver(&acpi_battery_driver); 1540 #ifdef CONFIG_ACPI_PROCFS_POWER 1541 if (result < 0) 1542 acpi_unlock_battery_dir(acpi_battery_dir); 1543 #endif 1544 battery_driver_registered = (result == 0); 1545 } 1546 1547 static int __init acpi_battery_init(void) 1548 { 1549 if (acpi_disabled) 1550 return -ENODEV; 1551 1552 async_cookie = async_schedule(acpi_battery_init_async, NULL); 1553 return 0; 1554 } 1555 1556 static void __exit acpi_battery_exit(void) 1557 { 1558 async_synchronize_cookie(async_cookie + 1); 1559 if (battery_driver_registered) { 1560 acpi_bus_unregister_driver(&acpi_battery_driver); 1561 battery_hook_exit(); 1562 } 1563 #ifdef CONFIG_ACPI_PROCFS_POWER 1564 if (acpi_battery_dir) 1565 acpi_unlock_battery_dir(acpi_battery_dir); 1566 #endif 1567 } 1568 1569 module_init(acpi_battery_init); 1570 module_exit(acpi_battery_exit); 1571