drivers/acpi/battery.c

   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);