drivers/acpi/battery.c

   1 /*
   2  *  battery.c - ACPI Battery Driver (Revision: 2.0)
   3  *
   4  *  Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
   5  *  Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
   6  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   7  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   8  *
   9  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  10  *
  11  *  This program is free software; you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License as published by
  13  *  the Free Software Foundation; either version 2 of the License, or (at
  14  *  your option) any later version.
  15  *
  16  *  This program is distributed in the hope that it will be useful, but
  17  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  *  General Public License for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License along
  22  *  with this program; if not, write to the Free Software Foundation, Inc.,
  23  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  24  *
  25  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  26  */
  27
  28 #include <linux/kernel.h>
  29 #include <linux/module.h>
  30 #include <linux/init.h>
  31 #include <linux/types.h>
  32 #include <linux/jiffies.h>
  33 #include <linux/async.h>
  34 #include <linux/dmi.h>
  35 #include <linux/slab.h>
  36 #include <linux/suspend.h>
  37 #include <asm/unaligned.h>
  38
  39 #ifdef CONFIG_ACPI_PROCFS_POWER
  40 #include <linux/proc_fs.h>
  41 #include <linux/seq_file.h>
  42 #include <asm/uaccess.h>
  43 #endif
  44
  45 #include <acpi/acpi_bus.h>
  46 #include <acpi/acpi_drivers.h>
  47 #include <linux/power_supply.h>
  48
  49 #define PREFIX "ACPI: "
  50
  51 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
  52
  53 #define ACPI_BATTERY_CLASS              "battery"
  54 #define ACPI_BATTERY_DEVICE_NAME        "Battery"
  55 #define ACPI_BATTERY_NOTIFY_STATUS      0x80
  56 #define ACPI_BATTERY_NOTIFY_INFO        0x81
  57 #define ACPI_BATTERY_NOTIFY_THRESHOLD   0x82
  58
  59 /* Battery power unit: 0 means mW, 1 means mA */
  60 #define ACPI_BATTERY_POWER_UNIT_MA      1
  61
  62 #define _COMPONENT              ACPI_BATTERY_COMPONENT
  63
  64 ACPI_MODULE_NAME("battery");
  65
  66 MODULE_AUTHOR("Paul Diefenbaugh");
  67 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
  68 MODULE_DESCRIPTION("ACPI Battery Driver");
  69 MODULE_LICENSE("GPL");
  70
  71 static unsigned int cache_time = 1000;
  72 module_param(cache_time, uint, 0644);
  73 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  74
  75 #ifdef CONFIG_ACPI_PROCFS_POWER
  76 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
  77 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
  78
  79 enum acpi_battery_files {
  80         info_tag = 0,
  81         state_tag,
  82         alarm_tag,
  83         ACPI_BATTERY_NUMFILES,
  84 };
  85
  86 #endif
  87
  88 static const struct acpi_device_id battery_device_ids[] = {
  89         {"PNP0C0A", 0},
  90         {"", 0},
  91 };
  92
  93 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
  94
  95 enum {
  96         ACPI_BATTERY_ALARM_PRESENT,
  97         ACPI_BATTERY_XINFO_PRESENT,
  98         ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
  99         /* On Lenovo Thinkpad models from 2010 and 2011, the power unit
 100            switches between mWh and mAh depending on whether the system
 101            is running on battery or not.  When mAh is the unit, most
 102            reported values are incorrect and need to be adjusted by
 103            10000/design_voltage.  Verified on x201, t410, t410s, and x220.
 104            Pre-2010 and 2012 models appear to always report in mWh and
 105            are thus unaffected (tested with t42, t61, t500, x200, x300,
 106            and x230).  Also, in mid-2012 Lenovo issued a BIOS update for
 107            the 2011 models that fixes the issue (tested on x220 with a
 108            post-1.29 BIOS), but as of Nov. 2012, no such update is
 109            available for the 2010 models.  */
 110         ACPI_BATTERY_QUIRK_THINKPAD_MAH,
 111 };
 112
 113 struct acpi_battery {
 114         struct mutex lock;
 115         struct mutex sysfs_lock;
 116         struct power_supply bat;
 117         struct acpi_device *device;
 118         struct notifier_block pm_nb;
 119         unsigned long update_time;
 120         int rate_now;
 121         int capacity_now;
 122         int voltage_now;
 123         int design_capacity;
 124         int full_charge_capacity;
 125         int technology;
 126         int design_voltage;
 127         int design_capacity_warning;
 128         int design_capacity_low;
 129         int cycle_count;
 130         int measurement_accuracy;
 131         int max_sampling_time;
 132         int min_sampling_time;
 133         int max_averaging_interval;
 134         int min_averaging_interval;
 135         int capacity_granularity_1;
 136         int capacity_granularity_2;
 137         int alarm;
 138         char model_number[32];
 139         char serial_number[32];
 140         char type[32];
 141         char oem_info[32];
 142         int state;
 143         int power_unit;
 144         unsigned long flags;
 145 };
 146
 147 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat)
 148
 149 static inline int acpi_battery_present(struct acpi_battery *battery)
 150 {
 151         return battery->device->status.battery_present;
 152 }
 153
 154 static int acpi_battery_technology(struct acpi_battery *battery)
 155 {
 156         if (!strcasecmp("NiCd", battery->type))
 157                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 158         if (!strcasecmp("NiMH", battery->type))
 159                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 160         if (!strcasecmp("LION", battery->type))
 161                 return POWER_SUPPLY_TECHNOLOGY_LION;
 162         if (!strncasecmp("LI-ION", battery->type, 6))
 163                 return POWER_SUPPLY_TECHNOLOGY_LION;
 164         if (!strcasecmp("LiP", battery->type))
 165                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 166         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 167 }
 168
 169 static int acpi_battery_get_state(struct acpi_battery *battery);
 170
 171 static int acpi_battery_is_charged(struct acpi_battery *battery)
 172 {
 173         /* either charging or discharging */
 174         if (battery->state != 0)
 175                 return 0;
 176
 177         /* battery not reporting charge */
 178         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
 179             battery->capacity_now == 0)
 180                 return 0;
 181
 182         /* good batteries update full_charge as the batteries degrade */
 183         if (battery->full_charge_capacity == battery->capacity_now)
 184                 return 1;
 185
 186         /* fallback to using design values for broken batteries */
 187         if (battery->design_capacity == battery->capacity_now)
 188                 return 1;
 189
 190         /* we don't do any sort of metric based on percentages */
 191         return 0;
 192 }
 193
 194 static int acpi_battery_get_property(struct power_supply *psy,
 195                                      enum power_supply_property psp,
 196                                      union power_supply_propval *val)
 197 {
 198         int ret = 0;
 199         struct acpi_battery *battery = to_acpi_battery(psy);
 200
 201         if (acpi_battery_present(battery)) {
 202                 /* run battery update only if it is present */
 203                 acpi_battery_get_state(battery);
 204         } else if (psp != POWER_SUPPLY_PROP_PRESENT)
 205                 return -ENODEV;
 206         switch (psp) {
 207         case POWER_SUPPLY_PROP_STATUS:
 208                 if (battery->state & 0x01)
 209                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 210                 else if (battery->state & 0x02)
 211                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 212                 else if (acpi_battery_is_charged(battery))
 213                         val->intval = POWER_SUPPLY_STATUS_FULL;
 214                 else
 215                         val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 216                 break;
 217         case POWER_SUPPLY_PROP_PRESENT:
 218                 val->intval = acpi_battery_present(battery);
 219                 break;
 220         case POWER_SUPPLY_PROP_TECHNOLOGY:
 221                 val->intval = acpi_battery_technology(battery);
 222                 break;
 223         case POWER_SUPPLY_PROP_CYCLE_COUNT:
 224                 val->intval = battery->cycle_count;
 225                 break;
 226         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 227                 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 228                         ret = -ENODEV;
 229                 else
 230                         val->intval = battery->design_voltage * 1000;
 231                 break;
 232         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 233                 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
 234                         ret = -ENODEV;
 235                 else
 236                         val->intval = battery->voltage_now * 1000;
 237                 break;
 238         case POWER_SUPPLY_PROP_CURRENT_NOW:
 239         case POWER_SUPPLY_PROP_POWER_NOW:
 240                 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
 241                         ret = -ENODEV;
 242                 else
 243                         val->intval = battery->rate_now * 1000;
 244                 break;
 245         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 246         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 247                 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 248                         ret = -ENODEV;
 249                 else
 250                         val->intval = battery->design_capacity * 1000;
 251                 break;
 252         case POWER_SUPPLY_PROP_CHARGE_FULL:
 253         case POWER_SUPPLY_PROP_ENERGY_FULL:
 254                 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 255                         ret = -ENODEV;
 256                 else
 257                         val->intval = battery->full_charge_capacity * 1000;
 258                 break;
 259         case POWER_SUPPLY_PROP_CHARGE_NOW:
 260         case POWER_SUPPLY_PROP_ENERGY_NOW:
 261                 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
 262                         ret = -ENODEV;
 263                 else
 264                         val->intval = battery->capacity_now * 1000;
 265                 break;
 266         case POWER_SUPPLY_PROP_CAPACITY:
 267                 if (battery->capacity_now && battery->full_charge_capacity)
 268                         val->intval = battery->capacity_now * 100/
 269                                         battery->full_charge_capacity;
 270                 else
 271                         val->intval = 0;
 272                 break;
 273         case POWER_SUPPLY_PROP_MODEL_NAME:
 274                 val->strval = battery->model_number;
 275                 break;
 276         case POWER_SUPPLY_PROP_MANUFACTURER:
 277                 val->strval = battery->oem_info;
 278                 break;
 279         case POWER_SUPPLY_PROP_SERIAL_NUMBER:
 280                 val->strval = battery->serial_number;
 281                 break;
 282         default:
 283                 ret = -EINVAL;
 284         }
 285         return ret;
 286 }
 287
 288 static enum power_supply_property charge_battery_props[] = {
 289         POWER_SUPPLY_PROP_STATUS,
 290         POWER_SUPPLY_PROP_PRESENT,
 291         POWER_SUPPLY_PROP_TECHNOLOGY,
 292         POWER_SUPPLY_PROP_CYCLE_COUNT,
 293         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 294         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 295         POWER_SUPPLY_PROP_CURRENT_NOW,
 296         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 297         POWER_SUPPLY_PROP_CHARGE_FULL,
 298         POWER_SUPPLY_PROP_CHARGE_NOW,
 299         POWER_SUPPLY_PROP_CAPACITY,
 300         POWER_SUPPLY_PROP_MODEL_NAME,
 301         POWER_SUPPLY_PROP_MANUFACTURER,
 302         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 303 };
 304
 305 static enum power_supply_property energy_battery_props[] = {
 306         POWER_SUPPLY_PROP_STATUS,
 307         POWER_SUPPLY_PROP_PRESENT,
 308         POWER_SUPPLY_PROP_TECHNOLOGY,
 309         POWER_SUPPLY_PROP_CYCLE_COUNT,
 310         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 311         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 312         POWER_SUPPLY_PROP_POWER_NOW,
 313         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 314         POWER_SUPPLY_PROP_ENERGY_FULL,
 315         POWER_SUPPLY_PROP_ENERGY_NOW,
 316         POWER_SUPPLY_PROP_CAPACITY,
 317         POWER_SUPPLY_PROP_MODEL_NAME,
 318         POWER_SUPPLY_PROP_MANUFACTURER,
 319         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 320 };
 321
 322 #ifdef CONFIG_ACPI_PROCFS_POWER
 323 inline char *acpi_battery_units(struct acpi_battery *battery)
 324 {
 325         return (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) ?
 326                 "mA" : "mW";
 327 }
 328 #endif
 329
 330 /* --------------------------------------------------------------------------
 331                                Battery Management
 332    -------------------------------------------------------------------------- */
 333 struct acpi_offsets {
 334         size_t offset;          /* offset inside struct acpi_sbs_battery */
 335         u8 mode;                /* int or string? */
 336 };
 337
 338 static struct acpi_offsets state_offsets[] = {
 339         {offsetof(struct acpi_battery, state), 0},
 340         {offsetof(struct acpi_battery, rate_now), 0},
 341         {offsetof(struct acpi_battery, capacity_now), 0},
 342         {offsetof(struct acpi_battery, voltage_now), 0},
 343 };
 344
 345 static struct acpi_offsets info_offsets[] = {
 346         {offsetof(struct acpi_battery, power_unit), 0},
 347         {offsetof(struct acpi_battery, design_capacity), 0},
 348         {offsetof(struct acpi_battery, full_charge_capacity), 0},
 349         {offsetof(struct acpi_battery, technology), 0},
 350         {offsetof(struct acpi_battery, design_voltage), 0},
 351         {offsetof(struct acpi_battery, design_capacity_warning), 0},
 352         {offsetof(struct acpi_battery, design_capacity_low), 0},
 353         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
 354         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
 355         {offsetof(struct acpi_battery, model_number), 1},
 356         {offsetof(struct acpi_battery, serial_number), 1},
 357         {offsetof(struct acpi_battery, type), 1},
 358         {offsetof(struct acpi_battery, oem_info), 1},
 359 };
 360
 361 static struct acpi_offsets extended_info_offsets[] = {
 362         {offsetof(struct acpi_battery, power_unit), 0},
 363         {offsetof(struct acpi_battery, design_capacity), 0},
 364         {offsetof(struct acpi_battery, full_charge_capacity), 0},
 365         {offsetof(struct acpi_battery, technology), 0},
 366         {offsetof(struct acpi_battery, design_voltage), 0},
 367         {offsetof(struct acpi_battery, design_capacity_warning), 0},
 368         {offsetof(struct acpi_battery, design_capacity_low), 0},
 369         {offsetof(struct acpi_battery, cycle_count), 0},
 370         {offsetof(struct acpi_battery, measurement_accuracy), 0},
 371         {offsetof(struct acpi_battery, max_sampling_time), 0},
 372         {offsetof(struct acpi_battery, min_sampling_time), 0},
 373         {offsetof(struct acpi_battery, max_averaging_interval), 0},
 374         {offsetof(struct acpi_battery, min_averaging_interval), 0},
 375         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
 376         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
 377         {offsetof(struct acpi_battery, model_number), 1},
 378         {offsetof(struct acpi_battery, serial_number), 1},
 379         {offsetof(struct acpi_battery, type), 1},
 380         {offsetof(struct acpi_battery, oem_info), 1},
 381 };
 382
 383 static int extract_package(struct acpi_battery *battery,
 384                            union acpi_object *package,
 385                            struct acpi_offsets *offsets, int num)
 386 {
 387         int i;
 388         union acpi_object *element;
 389         if (package->type != ACPI_TYPE_PACKAGE)
 390                 return -EFAULT;
 391         for (i = 0; i < num; ++i) {
 392                 if (package->package.count <= i)
 393                         return -EFAULT;
 394                 element = &package->package.elements[i];
 395                 if (offsets[i].mode) {
 396                         u8 *ptr = (u8 *)battery + offsets[i].offset;
 397                         if (element->type == ACPI_TYPE_STRING ||
 398                             element->type == ACPI_TYPE_BUFFER)
 399                                 strncpy(ptr, element->string.pointer, 32);
 400                         else if (element->type == ACPI_TYPE_INTEGER) {
 401                                 strncpy(ptr, (u8 *)&element->integer.value,
 402                                         sizeof(u64));
 403                                 ptr[sizeof(u64)] = 0;
 404                         } else
 405                                 *ptr = 0; /* don't have value */
 406                 } else {
 407                         int *x = (int *)((u8 *)battery + offsets[i].offset);
 408                         *x = (element->type == ACPI_TYPE_INTEGER) ?
 409                                 element->integer.value : -1;
 410                 }
 411         }
 412         return 0;
 413 }
 414
 415 static int acpi_battery_get_status(struct acpi_battery *battery)
 416 {
 417         if (acpi_bus_get_status(battery->device)) {
 418                 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
 419                 return -ENODEV;
 420         }
 421         return 0;
 422 }
 423
 424 static int acpi_battery_get_info(struct acpi_battery *battery)
 425 {
 426         int result = -EFAULT;
 427         acpi_status status = 0;
 428         char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags)?
 429                         "_BIX" : "_BIF";
 430
 431         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 432
 433         if (!acpi_battery_present(battery))
 434                 return 0;
 435         mutex_lock(&battery->lock);
 436         status = acpi_evaluate_object(battery->device->handle, name,
 437                                                 NULL, &buffer);
 438         mutex_unlock(&battery->lock);
 439
 440         if (ACPI_FAILURE(status)) {
 441                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name));
 442                 return -ENODEV;
 443         }
 444         if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags))
 445                 result = extract_package(battery, buffer.pointer,
 446                                 extended_info_offsets,
 447                                 ARRAY_SIZE(extended_info_offsets));
 448         else
 449                 result = extract_package(battery, buffer.pointer,
 450                                 info_offsets, ARRAY_SIZE(info_offsets));
 451         kfree(buffer.pointer);
 452         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
 453                 battery->full_charge_capacity = battery->design_capacity;
 454         if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
 455             battery->power_unit && battery->design_voltage) {
 456                 battery->design_capacity = battery->design_capacity *
 457                     10000 / battery->design_voltage;
 458                 battery->full_charge_capacity = battery->full_charge_capacity *
 459                     10000 / battery->design_voltage;
 460                 battery->design_capacity_warning =
 461                     battery->design_capacity_warning *
 462                     10000 / battery->design_voltage;
 463                 /* Curiously, design_capacity_low, unlike the rest of them,
 464                    is correct.  */
 465                 /* capacity_granularity_* equal 1 on the systems tested, so
 466                    it's impossible to tell if they would need an adjustment
 467                    or not if their values were higher.  */
 468         }
 469         return result;
 470 }
 471
 472 static int acpi_battery_get_state(struct acpi_battery *battery)
 473 {
 474         int result = 0;
 475         acpi_status status = 0;
 476         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 477
 478         if (!acpi_battery_present(battery))
 479                 return 0;
 480
 481         if (battery->update_time &&
 482             time_before(jiffies, battery->update_time +
 483                         msecs_to_jiffies(cache_time)))
 484                 return 0;
 485
 486         mutex_lock(&battery->lock);
 487         status = acpi_evaluate_object(battery->device->handle, "_BST",
 488                                       NULL, &buffer);
 489         mutex_unlock(&battery->lock);
 490
 491         if (ACPI_FAILURE(status)) {
 492                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
 493                 return -ENODEV;
 494         }
 495
 496         result = extract_package(battery, buffer.pointer,
 497                                  state_offsets, ARRAY_SIZE(state_offsets));
 498         battery->update_time = jiffies;
 499         kfree(buffer.pointer);
 500
 501         /* For buggy DSDTs that report negative 16-bit values for either
 502          * charging or discharging current and/or report 0 as 65536
 503          * due to bad math.
 504          */
 505         if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
 506                 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
 507                 (s16)(battery->rate_now) < 0) {
 508                 battery->rate_now = abs((s16)battery->rate_now);
 509                 printk_once(KERN_WARNING FW_BUG "battery: (dis)charge rate"
 510                         " invalid.\n");
 511         }
 512
 513         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
 514             && battery->capacity_now >= 0 && battery->capacity_now <= 100)
 515                 battery->capacity_now = (battery->capacity_now *
 516                                 battery->full_charge_capacity) / 100;
 517         if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
 518             battery->power_unit && battery->design_voltage) {
 519                 battery->capacity_now = battery->capacity_now *
 520                     10000 / battery->design_voltage;
 521         }
 522         return result;
 523 }
 524
 525 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 526 {
 527         acpi_status status = 0;
 528         union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
 529         struct acpi_object_list arg_list = { 1, &arg0 };
 530
 531         if (!acpi_battery_present(battery) ||
 532             !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
 533                 return -ENODEV;
 534
 535         arg0.integer.value = battery->alarm;
 536
 537         mutex_lock(&battery->lock);
 538         status = acpi_evaluate_object(battery->device->handle, "_BTP",
 539                                  &arg_list, NULL);
 540         mutex_unlock(&battery->lock);
 541
 542         if (ACPI_FAILURE(status))
 543                 return -ENODEV;
 544
 545         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
 546         return 0;
 547 }
 548
 549 static int acpi_battery_init_alarm(struct acpi_battery *battery)
 550 {
 551         acpi_status status = AE_OK;
 552         acpi_handle handle = NULL;
 553
 554         /* See if alarms are supported, and if so, set default */
 555         status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
 556         if (ACPI_FAILURE(status)) {
 557                 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
 558                 return 0;
 559         }
 560         set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
 561         if (!battery->alarm)
 562                 battery->alarm = battery->design_capacity_warning;
 563         return acpi_battery_set_alarm(battery);
 564 }
 565
 566 static ssize_t acpi_battery_alarm_show(struct device *dev,
 567                                         struct device_attribute *attr,
 568                                         char *buf)
 569 {
 570         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 571         return sprintf(buf, "%d\n", battery->alarm * 1000);
 572 }
 573
 574 static ssize_t acpi_battery_alarm_store(struct device *dev,
 575                                         struct device_attribute *attr,
 576                                         const char *buf, size_t count)
 577 {
 578         unsigned long x;
 579         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 580         if (sscanf(buf, "%ld\n", &x) == 1)
 581                 battery->alarm = x/1000;
 582         if (acpi_battery_present(battery))
 583                 acpi_battery_set_alarm(battery);
 584         return count;
 585 }
 586
 587 static struct device_attribute alarm_attr = {
 588         .attr = {.name = "alarm", .mode = 0644},
 589         .show = acpi_battery_alarm_show,
 590         .store = acpi_battery_alarm_store,
 591 };
 592
 593 static int sysfs_add_battery(struct acpi_battery *battery)
 594 {
 595         int result;
 596
 597         if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
 598                 battery->bat.properties = charge_battery_props;
 599                 battery->bat.num_properties =
 600                         ARRAY_SIZE(charge_battery_props);
 601         } else {
 602                 battery->bat.properties = energy_battery_props;
 603                 battery->bat.num_properties =
 604                         ARRAY_SIZE(energy_battery_props);
 605         }
 606
 607         battery->bat.name = acpi_device_bid(battery->device);
 608         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 609         battery->bat.get_property = acpi_battery_get_property;
 610
 611         result = power_supply_register(&battery->device->dev, &battery->bat);
 612         if (result)
 613                 return result;
 614         return device_create_file(battery->bat.dev, &alarm_attr);
 615 }
 616
 617 static void sysfs_remove_battery(struct acpi_battery *battery)
 618 {
 619         mutex_lock(&battery->sysfs_lock);
 620         if (!battery->bat.dev) {
 621                 mutex_unlock(&battery->sysfs_lock);
 622                 return;
 623         }
 624
 625         device_remove_file(battery->bat.dev, &alarm_attr);
 626         power_supply_unregister(&battery->bat);
 627         battery->bat.dev = NULL;
 628         mutex_unlock(&battery->sysfs_lock);
 629 }
 630
 631 static void find_battery(const struct dmi_header *dm, void *private)
 632 {
 633         struct acpi_battery *battery = (struct acpi_battery *)private;
 634         /* Note: the hardcoded offsets below have been extracted from
 635            the source code of dmidecode.  */
 636         if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) {
 637                 const u8 *dmi_data = (const u8 *)(dm + 1);
 638                 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6));
 639                 if (dm->length >= 18)
 640                         dmi_capacity *= dmi_data[17];
 641                 if (battery->design_capacity * battery->design_voltage / 1000
 642                     != dmi_capacity &&
 643                     battery->design_capacity * 10 == dmi_capacity)
 644                         set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
 645                                 &battery->flags);
 646         }
 647 }
 648
 649 /*
 650  * According to the ACPI spec, some kinds of primary batteries can
 651  * report percentage battery remaining capacity directly to OS.
 652  * In this case, it reports the Last Full Charged Capacity == 100
 653  * and BatteryPresentRate == 0xFFFFFFFF.
 654  *
 655  * Now we found some battery reports percentage remaining capacity
 656  * even if it's rechargeable.
 657  * https://bugzilla.kernel.org/show_bug.cgi?id=15979
 658  *
 659  * Handle this correctly so that they won't break userspace.
 660  */
 661 static void acpi_battery_quirks(struct acpi_battery *battery)
 662 {
 663         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
 664                 return ;
 665
 666         if (battery->full_charge_capacity == 100 &&
 667             battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
 668             battery->capacity_now >=0 && battery->capacity_now <= 100) {
 669                 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
 670                 battery->full_charge_capacity = battery->design_capacity;
 671                 battery->capacity_now = (battery->capacity_now *
 672                                 battery->full_charge_capacity) / 100;
 673         }
 674
 675         if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags))
 676                 return ;
 677
 678         if (battery->power_unit && dmi_name_in_vendors("LENOVO")) {
 679                 const char *s;
 680                 s = dmi_get_system_info(DMI_PRODUCT_VERSION);
 681                 if (s && !strnicmp(s, "ThinkPad", 8)) {
 682                         dmi_walk(find_battery, battery);
 683                         if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
 684                                      &battery->flags) &&
 685                             battery->design_voltage) {
 686                                 battery->design_capacity =
 687                                     battery->design_capacity *
 688                                     10000 / battery->design_voltage;
 689                                 battery->full_charge_capacity =
 690                                     battery->full_charge_capacity *
 691                                     10000 / battery->design_voltage;
 692                                 battery->design_capacity_warning =
 693                                     battery->design_capacity_warning *
 694                                     10000 / battery->design_voltage;
 695                                 battery->capacity_now = battery->capacity_now *
 696                                     10000 / battery->design_voltage;
 697                         }
 698                 }
 699         }
 700 }
 701
 702 static int acpi_battery_update(struct acpi_battery *battery)
 703 {
 704         int result, old_present = acpi_battery_present(battery);
 705         result = acpi_battery_get_status(battery);
 706         if (result)
 707                 return result;
 708         if (!acpi_battery_present(battery)) {
 709                 sysfs_remove_battery(battery);
 710                 battery->update_time = 0;
 711                 return 0;
 712         }
 713         if (!battery->update_time ||
 714             old_present != acpi_battery_present(battery)) {
 715                 result = acpi_battery_get_info(battery);
 716                 if (result)
 717                         return result;
 718                 acpi_battery_init_alarm(battery);
 719         }
 720         if (!battery->bat.dev) {
 721                 result = sysfs_add_battery(battery);
 722                 if (result)
 723                         return result;
 724         }
 725         result = acpi_battery_get_state(battery);
 726         acpi_battery_quirks(battery);
 727         return result;
 728 }
 729
 730 static void acpi_battery_refresh(struct acpi_battery *battery)
 731 {
 732         int power_unit;
 733
 734         if (!battery->bat.dev)
 735                 return;
 736
 737         power_unit = battery->power_unit;
 738
 739         acpi_battery_get_info(battery);
 740
 741         if (power_unit == battery->power_unit)
 742                 return;
 743
 744         /* The battery has changed its reporting units. */
 745         sysfs_remove_battery(battery);
 746         sysfs_add_battery(battery);
 747 }
 748
 749 /* --------------------------------------------------------------------------
 750                               FS Interface (/proc)
 751    -------------------------------------------------------------------------- */
 752
 753 #ifdef CONFIG_ACPI_PROCFS_POWER
 754 static struct proc_dir_entry *acpi_battery_dir;
 755
 756 static int acpi_battery_print_info(struct seq_file *seq, int result)
 757 {
 758         struct acpi_battery *battery = seq->private;
 759
 760         if (result)
 761                 goto end;
 762
 763         seq_printf(seq, "present:                 %s\n",
 764                    acpi_battery_present(battery)?"yes":"no");
 765         if (!acpi_battery_present(battery))
 766                 goto end;
 767         if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 768                 seq_printf(seq, "design capacity:         unknown\n");
 769         else
 770                 seq_printf(seq, "design capacity:         %d %sh\n",
 771                            battery->design_capacity,
 772                            acpi_battery_units(battery));
 773
 774         if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 775                 seq_printf(seq, "last full capacity:      unknown\n");
 776         else
 777                 seq_printf(seq, "last full capacity:      %d %sh\n",
 778                            battery->full_charge_capacity,
 779                            acpi_battery_units(battery));
 780
 781         seq_printf(seq, "battery technology:      %srechargeable\n",
 782                    (!battery->technology)?"non-":"");
 783
 784         if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 785                 seq_printf(seq, "design voltage:          unknown\n");
 786         else
 787                 seq_printf(seq, "design voltage:          %d mV\n",
 788                            battery->design_voltage);
 789         seq_printf(seq, "design capacity warning: %d %sh\n",
 790                    battery->design_capacity_warning,
 791                    acpi_battery_units(battery));
 792         seq_printf(seq, "design capacity low:     %d %sh\n",
 793                    battery->design_capacity_low,
 794                    acpi_battery_units(battery));
 795         seq_printf(seq, "cycle count:             %i\n", battery->cycle_count);
 796         seq_printf(seq, "capacity granularity 1:  %d %sh\n",
 797                    battery->capacity_granularity_1,
 798                    acpi_battery_units(battery));
 799         seq_printf(seq, "capacity granularity 2:  %d %sh\n",
 800                    battery->capacity_granularity_2,
 801                    acpi_battery_units(battery));
 802         seq_printf(seq, "model number:            %s\n", battery->model_number);
 803         seq_printf(seq, "serial number:           %s\n", battery->serial_number);
 804         seq_printf(seq, "battery type:            %s\n", battery->type);
 805         seq_printf(seq, "OEM info:                %s\n", battery->oem_info);
 806       end:
 807         if (result)
 808                 seq_printf(seq, "ERROR: Unable to read battery info\n");
 809         return result;
 810 }
 811
 812 static int acpi_battery_print_state(struct seq_file *seq, int result)
 813 {
 814         struct acpi_battery *battery = seq->private;
 815
 816         if (result)
 817                 goto end;
 818
 819         seq_printf(seq, "present:                 %s\n",
 820                    acpi_battery_present(battery)?"yes":"no");
 821         if (!acpi_battery_present(battery))
 822                 goto end;
 823
 824         seq_printf(seq, "capacity state:          %s\n",
 825                         (battery->state & 0x04)?"critical":"ok");
 826         if ((battery->state & 0x01) && (battery->state & 0x02))
 827                 seq_printf(seq,
 828                            "charging state:          charging/discharging\n");
 829         else if (battery->state & 0x01)
 830                 seq_printf(seq, "charging state:          discharging\n");
 831         else if (battery->state & 0x02)
 832                 seq_printf(seq, "charging state:          charging\n");
 833         else
 834                 seq_printf(seq, "charging state:          charged\n");
 835
 836         if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
 837                 seq_printf(seq, "present rate:            unknown\n");
 838         else
 839                 seq_printf(seq, "present rate:            %d %s\n",
 840                            battery->rate_now, acpi_battery_units(battery));
 841
 842         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
 843                 seq_printf(seq, "remaining capacity:      unknown\n");
 844         else
 845                 seq_printf(seq, "remaining capacity:      %d %sh\n",
 846                            battery->capacity_now, acpi_battery_units(battery));
 847         if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
 848                 seq_printf(seq, "present voltage:         unknown\n");
 849         else
 850                 seq_printf(seq, "present voltage:         %d mV\n",
 851                            battery->voltage_now);
 852       end:
 853         if (result)
 854                 seq_printf(seq, "ERROR: Unable to read battery state\n");
 855
 856         return result;
 857 }
 858
 859 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
 860 {
 861         struct acpi_battery *battery = seq->private;
 862
 863         if (result)
 864                 goto end;
 865
 866         if (!acpi_battery_present(battery)) {
 867                 seq_printf(seq, "present:                 no\n");
 868                 goto end;
 869         }
 870         seq_printf(seq, "alarm:                   ");
 871         if (!battery->alarm)
 872                 seq_printf(seq, "unsupported\n");
 873         else
 874                 seq_printf(seq, "%u %sh\n", battery->alarm,
 875                                 acpi_battery_units(battery));
 876       end:
 877         if (result)
 878                 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
 879         return result;
 880 }
 881
 882 static ssize_t acpi_battery_write_alarm(struct file *file,
 883                                         const char __user * buffer,
 884                                         size_t count, loff_t * ppos)
 885 {
 886         int result = 0;
 887         char alarm_string[12] = { '\0' };
 888         struct seq_file *m = file->private_data;
 889         struct acpi_battery *battery = m->private;
 890
 891         if (!battery || (count > sizeof(alarm_string) - 1))
 892                 return -EINVAL;
 893         if (!acpi_battery_present(battery)) {
 894                 result = -ENODEV;
 895                 goto end;
 896         }
 897         if (copy_from_user(alarm_string, buffer, count)) {
 898                 result = -EFAULT;
 899                 goto end;
 900         }
 901         alarm_string[count] = '\0';
 902         battery->alarm = simple_strtol(alarm_string, NULL, 0);
 903         result = acpi_battery_set_alarm(battery);
 904       end:
 905         if (!result)
 906                 return count;
 907         return result;
 908 }
 909
 910 typedef int(*print_func)(struct seq_file *seq, int result);
 911
 912 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
 913         acpi_battery_print_info,
 914         acpi_battery_print_state,
 915         acpi_battery_print_alarm,
 916 };
 917
 918 static int acpi_battery_read(int fid, struct seq_file *seq)
 919 {
 920         struct acpi_battery *battery = seq->private;
 921         int result = acpi_battery_update(battery);
 922         return acpi_print_funcs[fid](seq, result);
 923 }
 924
 925 #define DECLARE_FILE_FUNCTIONS(_name) \
 926 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
 927 { \
 928         return acpi_battery_read(_name##_tag, seq); \
 929 } \
 930 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
 931 { \
 932         return single_open(file, acpi_battery_read_##_name, PDE_DATA(inode)); \
 933 }
 934
 935 DECLARE_FILE_FUNCTIONS(info);
 936 DECLARE_FILE_FUNCTIONS(state);
 937 DECLARE_FILE_FUNCTIONS(alarm);
 938
 939 #undef DECLARE_FILE_FUNCTIONS
 940
 941 #define FILE_DESCRIPTION_RO(_name) \
 942         { \
 943         .name = __stringify(_name), \
 944         .mode = S_IRUGO, \
 945         .ops = { \
 946                 .open = acpi_battery_##_name##_open_fs, \
 947                 .read = seq_read, \
 948                 .llseek = seq_lseek, \
 949                 .release = single_release, \
 950                 .owner = THIS_MODULE, \
 951                 }, \
 952         }
 953
 954 #define FILE_DESCRIPTION_RW(_name) \
 955         { \
 956         .name = __stringify(_name), \
 957         .mode = S_IFREG | S_IRUGO | S_IWUSR, \
 958         .ops = { \
 959                 .open = acpi_battery_##_name##_open_fs, \
 960                 .read = seq_read, \
 961                 .llseek = seq_lseek, \
 962                 .write = acpi_battery_write_##_name, \
 963                 .release = single_release, \
 964                 .owner = THIS_MODULE, \
 965                 }, \
 966         }
 967
 968 static const struct battery_file {
 969         struct file_operations ops;
 970         umode_t mode;
 971         const char *name;
 972 } acpi_battery_file[] = {
 973         FILE_DESCRIPTION_RO(info),
 974         FILE_DESCRIPTION_RO(state),
 975         FILE_DESCRIPTION_RW(alarm),
 976 };
 977
 978 #undef FILE_DESCRIPTION_RO
 979 #undef FILE_DESCRIPTION_RW
 980
 981 static int acpi_battery_add_fs(struct acpi_device *device)
 982 {
 983         struct proc_dir_entry *entry = NULL;
 984         int i;
 985
 986         printk(KERN_WARNING PREFIX "Deprecated procfs I/F for battery is loaded,"
 987                         " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
 988         if (!acpi_device_dir(device)) {
 989                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 990                                                      acpi_battery_dir);
 991                 if (!acpi_device_dir(device))
 992                         return -ENODEV;
 993         }
 994
 995         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
 996                 entry = proc_create_data(acpi_battery_file[i].name,
 997                                          acpi_battery_file[i].mode,
 998                                          acpi_device_dir(device),
 999                                          &acpi_battery_file[i].ops,
1000                                          acpi_driver_data(device));
1001                 if (!entry)
1002                         return -ENODEV;
1003         }
1004         return 0;
1005 }
1006
1007 static void acpi_battery_remove_fs(struct acpi_device *device)
1008 {
1009         int i;
1010         if (!acpi_device_dir(device))
1011                 return;
1012         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
1013                 remove_proc_entry(acpi_battery_file[i].name,
1014                                   acpi_device_dir(device));
1015
1016         remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
1017         acpi_device_dir(device) = NULL;
1018 }
1019
1020 #endif
1021
1022 /* --------------------------------------------------------------------------
1023                                  Driver Interface
1024    -------------------------------------------------------------------------- */
1025
1026 static void acpi_battery_notify(struct acpi_device *device, u32 event)
1027 {
1028         struct acpi_battery *battery = acpi_driver_data(device);
1029         struct device *old;
1030
1031         if (!battery)
1032                 return;
1033         old = battery->bat.dev;
1034         if (event == ACPI_BATTERY_NOTIFY_INFO)
1035                 acpi_battery_refresh(battery);
1036         acpi_battery_update(battery);
1037         acpi_bus_generate_proc_event(device, event,
1038                                      acpi_battery_present(battery));
1039         acpi_bus_generate_netlink_event(device->pnp.device_class,
1040                                         dev_name(&device->dev), event,
1041                                         acpi_battery_present(battery));
1042         /* acpi_battery_update could remove power_supply object */
1043         if (old && battery->bat.dev)
1044                 power_supply_changed(&battery->bat);
1045 }
1046
1047 static int battery_notify(struct notifier_block *nb,
1048                                unsigned long mode, void *_unused)
1049 {
1050         struct acpi_battery *battery = container_of(nb, struct acpi_battery,
1051                                                     pm_nb);
1052         switch (mode) {
1053         case PM_POST_HIBERNATION:
1054         case PM_POST_SUSPEND:
1055                 if (battery->bat.dev) {
1056                         sysfs_remove_battery(battery);
1057                         sysfs_add_battery(battery);
1058                 }
1059                 break;
1060         }
1061
1062         return 0;
1063 }
1064
1065 static int acpi_battery_add(struct acpi_device *device)
1066 {
1067         int result = 0;
1068         struct acpi_battery *battery = NULL;
1069         acpi_handle handle;
1070         if (!device)
1071                 return -EINVAL;
1072         battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
1073         if (!battery)
1074                 return -ENOMEM;
1075         battery->device = device;
1076         strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
1077         strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
1078         device->driver_data = battery;
1079         mutex_init(&battery->lock);
1080         mutex_init(&battery->sysfs_lock);
1081         if (ACPI_SUCCESS(acpi_get_handle(battery->device->handle,
1082                         "_BIX", &handle)))
1083                 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
1084         result = acpi_battery_update(battery);
1085         if (result)
1086                 goto fail;
1087 #ifdef CONFIG_ACPI_PROCFS_POWER
1088         result = acpi_battery_add_fs(device);
1089 #endif
1090         if (result) {
1091 #ifdef CONFIG_ACPI_PROCFS_POWER
1092                 acpi_battery_remove_fs(device);
1093 #endif
1094                 goto fail;
1095         }
1096
1097         printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
1098                 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
1099                 device->status.battery_present ? "present" : "absent");
1100
1101         battery->pm_nb.notifier_call = battery_notify;
1102         register_pm_notifier(&battery->pm_nb);
1103
1104         return result;
1105
1106 fail:
1107         sysfs_remove_battery(battery);
1108         mutex_destroy(&battery->lock);
1109         mutex_destroy(&battery->sysfs_lock);
1110         kfree(battery);
1111         return result;
1112 }
1113
1114 static int acpi_battery_remove(struct acpi_device *device)
1115 {
1116         struct acpi_battery *battery = NULL;
1117
1118         if (!device || !acpi_driver_data(device))
1119                 return -EINVAL;
1120         battery = acpi_driver_data(device);
1121         unregister_pm_notifier(&battery->pm_nb);
1122 #ifdef CONFIG_ACPI_PROCFS_POWER
1123         acpi_battery_remove_fs(device);
1124 #endif
1125         sysfs_remove_battery(battery);
1126         mutex_destroy(&battery->lock);
1127         mutex_destroy(&battery->sysfs_lock);
1128         kfree(battery);
1129         return 0;
1130 }
1131
1132 #ifdef CONFIG_PM_SLEEP
1133 /* this is needed to learn about changes made in suspended state */
1134 static int acpi_battery_resume(struct device *dev)
1135 {
1136         struct acpi_battery *battery;
1137
1138         if (!dev)
1139                 return -EINVAL;
1140
1141         battery = acpi_driver_data(to_acpi_device(dev));
1142         if (!battery)
1143                 return -EINVAL;
1144
1145         battery->update_time = 0;
1146         acpi_battery_update(battery);
1147         return 0;
1148 }
1149 #endif
1150
1151 static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);
1152
1153 static struct acpi_driver acpi_battery_driver = {
1154         .name = "battery",
1155         .class = ACPI_BATTERY_CLASS,
1156         .ids = battery_device_ids,
1157         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1158         .ops = {
1159                 .add = acpi_battery_add,
1160                 .remove = acpi_battery_remove,
1161                 .notify = acpi_battery_notify,
1162                 },
1163         .drv.pm = &acpi_battery_pm,
1164 };
1165
1166 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1167 {
1168         if (acpi_disabled)
1169                 return;
1170 #ifdef CONFIG_ACPI_PROCFS_POWER
1171         acpi_battery_dir = acpi_lock_battery_dir();
1172         if (!acpi_battery_dir)
1173                 return;
1174 #endif
1175         if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
1176 #ifdef CONFIG_ACPI_PROCFS_POWER
1177                 acpi_unlock_battery_dir(acpi_battery_dir);
1178 #endif
1179                 return;
1180         }
1181         return;
1182 }
1183
1184 static int __init acpi_battery_init(void)
1185 {
1186         async_schedule(acpi_battery_init_async, NULL);
1187         return 0;
1188 }
1189
1190 static void __exit acpi_battery_exit(void)
1191 {
1192         acpi_bus_unregister_driver(&acpi_battery_driver);
1193 #ifdef CONFIG_ACPI_PROCFS_POWER
1194         acpi_unlock_battery_dir(acpi_battery_dir);
1195 #endif
1196 }
1197
1198 module_init(acpi_battery_init);
1199 module_exit(acpi_battery_exit);