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
  38 #ifdef CONFIG_ACPI_PROCFS_POWER
  39 #include <linux/proc_fs.h>
  40 #include <linux/seq_file.h>
  41 #include <asm/uaccess.h>
  42 #endif
  43
  44 #include <acpi/acpi_bus.h>
  45 #include <acpi/acpi_drivers.h>
  46 #include <linux/power_supply.h>
  47
  48 #define PREFIX "ACPI: "
  49
  50 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
  51
  52 #define ACPI_BATTERY_CLASS              "battery"
  53 #define ACPI_BATTERY_DEVICE_NAME        "Battery"
  54 #define ACPI_BATTERY_NOTIFY_STATUS      0x80
  55 #define ACPI_BATTERY_NOTIFY_INFO        0x81
  56 #define ACPI_BATTERY_NOTIFY_THRESHOLD   0x82
  57
  58 #define _COMPONENT              ACPI_BATTERY_COMPONENT
  59
  60 ACPI_MODULE_NAME("battery");
  61
  62 MODULE_AUTHOR("Paul Diefenbaugh");
  63 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
  64 MODULE_DESCRIPTION("ACPI Battery Driver");
  65 MODULE_LICENSE("GPL");
  66
  67 static unsigned int cache_time = 1000;
  68 module_param(cache_time, uint, 0644);
  69 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  70
  71 #ifdef CONFIG_ACPI_PROCFS_POWER
  72 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
  73 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
  74
  75 enum acpi_battery_files {
  76         info_tag = 0,
  77         state_tag,
  78         alarm_tag,
  79         ACPI_BATTERY_NUMFILES,
  80 };
  81
  82 #endif
  83
  84 static const struct acpi_device_id battery_device_ids[] = {
  85         {"PNP0C0A", 0},
  86         {"", 0},
  87 };
  88
  89 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
  90
  91 enum {
  92         ACPI_BATTERY_ALARM_PRESENT,
  93         ACPI_BATTERY_XINFO_PRESENT,
  94         /* For buggy DSDTs that report negative 16-bit values for either
  95          * charging or discharging current and/or report 0 as 65536
  96          * due to bad math.
  97          */
  98         ACPI_BATTERY_QUIRK_SIGNED16_CURRENT,
  99         ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
 100 };
 101
 102 struct acpi_battery {
 103         struct mutex lock;
 104         struct power_supply bat;
 105         struct acpi_device *device;
 106         struct notifier_block pm_nb;
 107         unsigned long update_time;
 108         int rate_now;
 109         int capacity_now;
 110         int voltage_now;
 111         int design_capacity;
 112         int full_charge_capacity;
 113         int technology;
 114         int design_voltage;
 115         int design_capacity_warning;
 116         int design_capacity_low;
 117         int cycle_count;
 118         int measurement_accuracy;
 119         int max_sampling_time;
 120         int min_sampling_time;
 121         int max_averaging_interval;
 122         int min_averaging_interval;
 123         int capacity_granularity_1;
 124         int capacity_granularity_2;
 125         int alarm;
 126         char model_number[32];
 127         char serial_number[32];
 128         char type[32];
 129         char oem_info[32];
 130         int state;
 131         int power_unit;
 132         unsigned long flags;
 133 };
 134
 135 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
 136
 137 inline int acpi_battery_present(struct acpi_battery *battery)
 138 {
 139         return battery->device->status.battery_present;
 140 }
 141
 142 static int acpi_battery_technology(struct acpi_battery *battery)
 143 {
 144         if (!strcasecmp("NiCd", battery->type))
 145                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 146         if (!strcasecmp("NiMH", battery->type))
 147                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 148         if (!strcasecmp("LION", battery->type))
 149                 return POWER_SUPPLY_TECHNOLOGY_LION;
 150         if (!strncasecmp("LI-ION", battery->type, 6))
 151                 return POWER_SUPPLY_TECHNOLOGY_LION;
 152         if (!strcasecmp("LiP", battery->type))
 153                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 154         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 155 }
 156
 157 static int acpi_battery_get_state(struct acpi_battery *battery);
 158
 159 static int acpi_battery_is_charged(struct acpi_battery *battery)
 160 {
 161         /* either charging or discharging */
 162         if (battery->state != 0)
 163                 return 0;
 164
 165         /* battery not reporting charge */
 166         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
 167             battery->capacity_now == 0)
 168                 return 0;
 169
 170         /* good batteries update full_charge as the batteries degrade */
 171         if (battery->full_charge_capacity == battery->capacity_now)
 172                 return 1;
 173
 174         /* fallback to using design values for broken batteries */
 175         if (battery->design_capacity == battery->capacity_now)
 176                 return 1;
 177
 178         /* we don't do any sort of metric based on percentages */
 179         return 0;
 180 }
 181
 182 static int acpi_battery_get_property(struct power_supply *psy,
 183                                      enum power_supply_property psp,
 184                                      union power_supply_propval *val)
 185 {
 186         int ret = 0;
 187         struct acpi_battery *battery = to_acpi_battery(psy);
 188
 189         if (acpi_battery_present(battery)) {
 190                 /* run battery update only if it is present */
 191                 acpi_battery_get_state(battery);
 192         } else if (psp != POWER_SUPPLY_PROP_PRESENT)
 193                 return -ENODEV;
 194         switch (psp) {
 195         case POWER_SUPPLY_PROP_STATUS:
 196                 if (battery->state & 0x01)
 197                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 198                 else if (battery->state & 0x02)
 199                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 200                 else if (acpi_battery_is_charged(battery))
 201                         val->intval = POWER_SUPPLY_STATUS_FULL;
 202                 else
 203                         val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 204                 break;
 205         case POWER_SUPPLY_PROP_PRESENT:
 206                 val->intval = acpi_battery_present(battery);
 207                 break;
 208         case POWER_SUPPLY_PROP_TECHNOLOGY:
 209                 val->intval = acpi_battery_technology(battery);
 210                 break;
 211         case POWER_SUPPLY_PROP_CYCLE_COUNT:
 212                 val->intval = battery->cycle_count;
 213                 break;
 214         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 215                 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 216                         ret = -ENODEV;
 217                 else
 218                         val->intval = battery->design_voltage * 1000;
 219                 break;
 220         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 221                 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
 222                         ret = -ENODEV;
 223                 else
 224                         val->intval = battery->voltage_now * 1000;
 225                 break;
 226         case POWER_SUPPLY_PROP_CURRENT_NOW:
 227         case POWER_SUPPLY_PROP_POWER_NOW:
 228                 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
 229                         ret = -ENODEV;
 230                 else
 231                         val->intval = battery->rate_now * 1000;
 232                 break;
 233         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 234         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 235                 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 236                         ret = -ENODEV;
 237                 else
 238                         val->intval = battery->design_capacity * 1000;
 239                 break;
 240         case POWER_SUPPLY_PROP_CHARGE_FULL:
 241         case POWER_SUPPLY_PROP_ENERGY_FULL:
 242                 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 243                         ret = -ENODEV;
 244                 else
 245                         val->intval = battery->full_charge_capacity * 1000;
 246                 break;
 247         case POWER_SUPPLY_PROP_CHARGE_NOW:
 248         case POWER_SUPPLY_PROP_ENERGY_NOW:
 249                 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
 250                         ret = -ENODEV;
 251                 else
 252                         val->intval = battery->capacity_now * 1000;
 253                 break;
 254         case POWER_SUPPLY_PROP_MODEL_NAME:
 255                 val->strval = battery->model_number;
 256                 break;
 257         case POWER_SUPPLY_PROP_MANUFACTURER:
 258                 val->strval = battery->oem_info;
 259                 break;
 260         case POWER_SUPPLY_PROP_SERIAL_NUMBER:
 261                 val->strval = battery->serial_number;
 262                 break;
 263         default:
 264                 ret = -EINVAL;
 265         }
 266         return ret;
 267 }
 268
 269 static enum power_supply_property charge_battery_props[] = {
 270         POWER_SUPPLY_PROP_STATUS,
 271         POWER_SUPPLY_PROP_PRESENT,
 272         POWER_SUPPLY_PROP_TECHNOLOGY,
 273         POWER_SUPPLY_PROP_CYCLE_COUNT,
 274         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 275         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 276         POWER_SUPPLY_PROP_CURRENT_NOW,
 277         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 278         POWER_SUPPLY_PROP_CHARGE_FULL,
 279         POWER_SUPPLY_PROP_CHARGE_NOW,
 280         POWER_SUPPLY_PROP_MODEL_NAME,
 281         POWER_SUPPLY_PROP_MANUFACTURER,
 282         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 283 };
 284
 285 static enum power_supply_property energy_battery_props[] = {
 286         POWER_SUPPLY_PROP_STATUS,
 287         POWER_SUPPLY_PROP_PRESENT,
 288         POWER_SUPPLY_PROP_TECHNOLOGY,
 289         POWER_SUPPLY_PROP_CYCLE_COUNT,
 290         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 291         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 292         POWER_SUPPLY_PROP_POWER_NOW,
 293         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 294         POWER_SUPPLY_PROP_ENERGY_FULL,
 295         POWER_SUPPLY_PROP_ENERGY_NOW,
 296         POWER_SUPPLY_PROP_MODEL_NAME,
 297         POWER_SUPPLY_PROP_MANUFACTURER,
 298         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 299 };
 300
 301 #ifdef CONFIG_ACPI_PROCFS_POWER
 302 inline char *acpi_battery_units(struct acpi_battery *battery)
 303 {
 304         return (battery->power_unit)?"mA":"mW";
 305 }
 306 #endif
 307
 308 /* --------------------------------------------------------------------------
 309                                Battery Management
 310    -------------------------------------------------------------------------- */
 311 struct acpi_offsets {
 312         size_t offset;          /* offset inside struct acpi_sbs_battery */
 313         u8 mode;                /* int or string? */
 314 };
 315
 316 static struct acpi_offsets state_offsets[] = {
 317         {offsetof(struct acpi_battery, state), 0},
 318         {offsetof(struct acpi_battery, rate_now), 0},
 319         {offsetof(struct acpi_battery, capacity_now), 0},
 320         {offsetof(struct acpi_battery, voltage_now), 0},
 321 };
 322
 323 static struct acpi_offsets info_offsets[] = {
 324         {offsetof(struct acpi_battery, power_unit), 0},
 325         {offsetof(struct acpi_battery, design_capacity), 0},
 326         {offsetof(struct acpi_battery, full_charge_capacity), 0},
 327         {offsetof(struct acpi_battery, technology), 0},
 328         {offsetof(struct acpi_battery, design_voltage), 0},
 329         {offsetof(struct acpi_battery, design_capacity_warning), 0},
 330         {offsetof(struct acpi_battery, design_capacity_low), 0},
 331         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
 332         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
 333         {offsetof(struct acpi_battery, model_number), 1},
 334         {offsetof(struct acpi_battery, serial_number), 1},
 335         {offsetof(struct acpi_battery, type), 1},
 336         {offsetof(struct acpi_battery, oem_info), 1},
 337 };
 338
 339 static struct acpi_offsets extended_info_offsets[] = {
 340         {offsetof(struct acpi_battery, power_unit), 0},
 341         {offsetof(struct acpi_battery, design_capacity), 0},
 342         {offsetof(struct acpi_battery, full_charge_capacity), 0},
 343         {offsetof(struct acpi_battery, technology), 0},
 344         {offsetof(struct acpi_battery, design_voltage), 0},
 345         {offsetof(struct acpi_battery, design_capacity_warning), 0},
 346         {offsetof(struct acpi_battery, design_capacity_low), 0},
 347         {offsetof(struct acpi_battery, cycle_count), 0},
 348         {offsetof(struct acpi_battery, measurement_accuracy), 0},
 349         {offsetof(struct acpi_battery, max_sampling_time), 0},
 350         {offsetof(struct acpi_battery, min_sampling_time), 0},
 351         {offsetof(struct acpi_battery, max_averaging_interval), 0},
 352         {offsetof(struct acpi_battery, min_averaging_interval), 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 int extract_package(struct acpi_battery *battery,
 362                            union acpi_object *package,
 363                            struct acpi_offsets *offsets, int num)
 364 {
 365         int i;
 366         union acpi_object *element;
 367         if (package->type != ACPI_TYPE_PACKAGE)
 368                 return -EFAULT;
 369         for (i = 0; i < num; ++i) {
 370                 if (package->package.count <= i)
 371                         return -EFAULT;
 372                 element = &package->package.elements[i];
 373                 if (offsets[i].mode) {
 374                         u8 *ptr = (u8 *)battery + offsets[i].offset;
 375                         if (element->type == ACPI_TYPE_STRING ||
 376                             element->type == ACPI_TYPE_BUFFER)
 377                                 strncpy(ptr, element->string.pointer, 32);
 378                         else if (element->type == ACPI_TYPE_INTEGER) {
 379                                 strncpy(ptr, (u8 *)&element->integer.value,
 380                                         sizeof(u64));
 381                                 ptr[sizeof(u64)] = 0;
 382                         } else
 383                                 *ptr = 0; /* don't have value */
 384                 } else {
 385                         int *x = (int *)((u8 *)battery + offsets[i].offset);
 386                         *x = (element->type == ACPI_TYPE_INTEGER) ?
 387                                 element->integer.value : -1;
 388                 }
 389         }
 390         return 0;
 391 }
 392
 393 static int acpi_battery_get_status(struct acpi_battery *battery)
 394 {
 395         if (acpi_bus_get_status(battery->device)) {
 396                 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
 397                 return -ENODEV;
 398         }
 399         return 0;
 400 }
 401
 402 static int acpi_battery_get_info(struct acpi_battery *battery)
 403 {
 404         int result = -EFAULT;
 405         acpi_status status = 0;
 406         char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags)?
 407                         "_BIX" : "_BIF";
 408
 409         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 410
 411         if (!acpi_battery_present(battery))
 412                 return 0;
 413         mutex_lock(&battery->lock);
 414         status = acpi_evaluate_object(battery->device->handle, name,
 415                                                 NULL, &buffer);
 416         mutex_unlock(&battery->lock);
 417
 418         if (ACPI_FAILURE(status)) {
 419                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name));
 420                 return -ENODEV;
 421         }
 422         if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags))
 423                 result = extract_package(battery, buffer.pointer,
 424                                 extended_info_offsets,
 425                                 ARRAY_SIZE(extended_info_offsets));
 426         else
 427                 result = extract_package(battery, buffer.pointer,
 428                                 info_offsets, ARRAY_SIZE(info_offsets));
 429         kfree(buffer.pointer);
 430         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
 431                 battery->full_charge_capacity = battery->design_capacity;
 432         return result;
 433 }
 434
 435 static int acpi_battery_get_state(struct acpi_battery *battery)
 436 {
 437         int result = 0;
 438         acpi_status status = 0;
 439         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 440
 441         if (!acpi_battery_present(battery))
 442                 return 0;
 443
 444         if (battery->update_time &&
 445             time_before(jiffies, battery->update_time +
 446                         msecs_to_jiffies(cache_time)))
 447                 return 0;
 448
 449         mutex_lock(&battery->lock);
 450         status = acpi_evaluate_object(battery->device->handle, "_BST",
 451                                       NULL, &buffer);
 452         mutex_unlock(&battery->lock);
 453
 454         if (ACPI_FAILURE(status)) {
 455                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
 456                 return -ENODEV;
 457         }
 458
 459         result = extract_package(battery, buffer.pointer,
 460                                  state_offsets, ARRAY_SIZE(state_offsets));
 461         battery->update_time = jiffies;
 462         kfree(buffer.pointer);
 463
 464         if (test_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags) &&
 465             battery->rate_now != -1)
 466                 battery->rate_now = abs((s16)battery->rate_now);
 467
 468         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
 469             && battery->capacity_now >= 0 && battery->capacity_now <= 100)
 470                 battery->capacity_now = (battery->capacity_now *
 471                                 battery->full_charge_capacity) / 100;
 472         return result;
 473 }
 474
 475 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 476 {
 477         acpi_status status = 0;
 478         union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
 479         struct acpi_object_list arg_list = { 1, &arg0 };
 480
 481         if (!acpi_battery_present(battery) ||
 482             !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
 483                 return -ENODEV;
 484
 485         arg0.integer.value = battery->alarm;
 486
 487         mutex_lock(&battery->lock);
 488         status = acpi_evaluate_object(battery->device->handle, "_BTP",
 489                                  &arg_list, NULL);
 490         mutex_unlock(&battery->lock);
 491
 492         if (ACPI_FAILURE(status))
 493                 return -ENODEV;
 494
 495         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
 496         return 0;
 497 }
 498
 499 static int acpi_battery_init_alarm(struct acpi_battery *battery)
 500 {
 501         acpi_status status = AE_OK;
 502         acpi_handle handle = NULL;
 503
 504         /* See if alarms are supported, and if so, set default */
 505         status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
 506         if (ACPI_FAILURE(status)) {
 507                 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
 508                 return 0;
 509         }
 510         set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
 511         if (!battery->alarm)
 512                 battery->alarm = battery->design_capacity_warning;
 513         return acpi_battery_set_alarm(battery);
 514 }
 515
 516 static ssize_t acpi_battery_alarm_show(struct device *dev,
 517                                         struct device_attribute *attr,
 518                                         char *buf)
 519 {
 520         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 521         return sprintf(buf, "%d\n", battery->alarm * 1000);
 522 }
 523
 524 static ssize_t acpi_battery_alarm_store(struct device *dev,
 525                                         struct device_attribute *attr,
 526                                         const char *buf, size_t count)
 527 {
 528         unsigned long x;
 529         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 530         if (sscanf(buf, "%ld\n", &x) == 1)
 531                 battery->alarm = x/1000;
 532         if (acpi_battery_present(battery))
 533                 acpi_battery_set_alarm(battery);
 534         return count;
 535 }
 536
 537 static struct device_attribute alarm_attr = {
 538         .attr = {.name = "alarm", .mode = 0644},
 539         .show = acpi_battery_alarm_show,
 540         .store = acpi_battery_alarm_store,
 541 };
 542
 543 static int sysfs_add_battery(struct acpi_battery *battery)
 544 {
 545         int result;
 546
 547         if (battery->power_unit) {
 548                 battery->bat.properties = charge_battery_props;
 549                 battery->bat.num_properties =
 550                         ARRAY_SIZE(charge_battery_props);
 551         } else {
 552                 battery->bat.properties = energy_battery_props;
 553                 battery->bat.num_properties =
 554                         ARRAY_SIZE(energy_battery_props);
 555         }
 556
 557         battery->bat.name = acpi_device_bid(battery->device);
 558         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 559         battery->bat.get_property = acpi_battery_get_property;
 560
 561         result = power_supply_register(&battery->device->dev, &battery->bat);
 562         if (result)
 563                 return result;
 564         return device_create_file(battery->bat.dev, &alarm_attr);
 565 }
 566
 567 static void sysfs_remove_battery(struct acpi_battery *battery)
 568 {
 569         if (!battery->bat.dev)
 570                 return;
 571         device_remove_file(battery->bat.dev, &alarm_attr);
 572         power_supply_unregister(&battery->bat);
 573         battery->bat.dev = NULL;
 574 }
 575
 576 static void acpi_battery_quirks(struct acpi_battery *battery)
 577 {
 578         if (dmi_name_in_vendors("Acer") && battery->power_unit) {
 579                 set_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags);
 580         }
 581 }
 582
 583 /*
 584  * According to the ACPI spec, some kinds of primary batteries can
 585  * report percentage battery remaining capacity directly to OS.
 586  * In this case, it reports the Last Full Charged Capacity == 100
 587  * and BatteryPresentRate == 0xFFFFFFFF.
 588  *
 589  * Now we found some battery reports percentage remaining capacity
 590  * even if it's rechargeable.
 591  * https://bugzilla.kernel.org/show_bug.cgi?id=15979
 592  *
 593  * Handle this correctly so that they won't break userspace.
 594  */
 595 static void acpi_battery_quirks2(struct acpi_battery *battery)
 596 {
 597         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
 598                 return ;
 599
 600         if (battery->full_charge_capacity == 100 &&
 601             battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
 602             battery->capacity_now >=0 && battery->capacity_now <= 100) {
 603                 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
 604                 battery->full_charge_capacity = battery->design_capacity;
 605                 battery->capacity_now = (battery->capacity_now *
 606                                 battery->full_charge_capacity) / 100;
 607         }
 608 }
 609
 610 static int acpi_battery_update(struct acpi_battery *battery)
 611 {
 612         int result, old_present = acpi_battery_present(battery);
 613         result = acpi_battery_get_status(battery);
 614         if (result)
 615                 return result;
 616         if (!acpi_battery_present(battery)) {
 617                 sysfs_remove_battery(battery);
 618                 battery->update_time = 0;
 619                 return 0;
 620         }
 621         if (!battery->update_time ||
 622             old_present != acpi_battery_present(battery)) {
 623                 result = acpi_battery_get_info(battery);
 624                 if (result)
 625                         return result;
 626                 acpi_battery_quirks(battery);
 627                 acpi_battery_init_alarm(battery);
 628         }
 629         if (!battery->bat.dev)
 630                 sysfs_add_battery(battery);
 631         result = acpi_battery_get_state(battery);
 632         acpi_battery_quirks2(battery);
 633         return result;
 634 }
 635
 636 static void acpi_battery_refresh(struct acpi_battery *battery)
 637 {
 638         int power_unit;
 639
 640         if (!battery->bat.dev)
 641                 return;
 642
 643         power_unit = battery->power_unit;
 644
 645         acpi_battery_get_info(battery);
 646
 647         if (power_unit == battery->power_unit)
 648                 return;
 649
 650         /* The battery has changed its reporting units. */
 651         sysfs_remove_battery(battery);
 652         sysfs_add_battery(battery);
 653 }
 654
 655 /* --------------------------------------------------------------------------
 656                               FS Interface (/proc)
 657    -------------------------------------------------------------------------- */
 658
 659 #ifdef CONFIG_ACPI_PROCFS_POWER
 660 static struct proc_dir_entry *acpi_battery_dir;
 661
 662 static int acpi_battery_print_info(struct seq_file *seq, int result)
 663 {
 664         struct acpi_battery *battery = seq->private;
 665
 666         if (result)
 667                 goto end;
 668
 669         seq_printf(seq, "present:                 %s\n",
 670                    acpi_battery_present(battery)?"yes":"no");
 671         if (!acpi_battery_present(battery))
 672                 goto end;
 673         if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 674                 seq_printf(seq, "design capacity:         unknown\n");
 675         else
 676                 seq_printf(seq, "design capacity:         %d %sh\n",
 677                            battery->design_capacity,
 678                            acpi_battery_units(battery));
 679
 680         if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 681                 seq_printf(seq, "last full capacity:      unknown\n");
 682         else
 683                 seq_printf(seq, "last full capacity:      %d %sh\n",
 684                            battery->full_charge_capacity,
 685                            acpi_battery_units(battery));
 686
 687         seq_printf(seq, "battery technology:      %srechargeable\n",
 688                    (!battery->technology)?"non-":"");
 689
 690         if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 691                 seq_printf(seq, "design voltage:          unknown\n");
 692         else
 693                 seq_printf(seq, "design voltage:          %d mV\n",
 694                            battery->design_voltage);
 695         seq_printf(seq, "design capacity warning: %d %sh\n",
 696                    battery->design_capacity_warning,
 697                    acpi_battery_units(battery));
 698         seq_printf(seq, "design capacity low:     %d %sh\n",
 699                    battery->design_capacity_low,
 700                    acpi_battery_units(battery));
 701         seq_printf(seq, "cycle count:             %i\n", battery->cycle_count);
 702         seq_printf(seq, "capacity granularity 1:  %d %sh\n",
 703                    battery->capacity_granularity_1,
 704                    acpi_battery_units(battery));
 705         seq_printf(seq, "capacity granularity 2:  %d %sh\n",
 706                    battery->capacity_granularity_2,
 707                    acpi_battery_units(battery));
 708         seq_printf(seq, "model number:            %s\n", battery->model_number);
 709         seq_printf(seq, "serial number:           %s\n", battery->serial_number);
 710         seq_printf(seq, "battery type:            %s\n", battery->type);
 711         seq_printf(seq, "OEM info:                %s\n", battery->oem_info);
 712       end:
 713         if (result)
 714                 seq_printf(seq, "ERROR: Unable to read battery info\n");
 715         return result;
 716 }
 717
 718 static int acpi_battery_print_state(struct seq_file *seq, int result)
 719 {
 720         struct acpi_battery *battery = seq->private;
 721
 722         if (result)
 723                 goto end;
 724
 725         seq_printf(seq, "present:                 %s\n",
 726                    acpi_battery_present(battery)?"yes":"no");
 727         if (!acpi_battery_present(battery))
 728                 goto end;
 729
 730         seq_printf(seq, "capacity state:          %s\n",
 731                         (battery->state & 0x04)?"critical":"ok");
 732         if ((battery->state & 0x01) && (battery->state & 0x02))
 733                 seq_printf(seq,
 734                            "charging state:          charging/discharging\n");
 735         else if (battery->state & 0x01)
 736                 seq_printf(seq, "charging state:          discharging\n");
 737         else if (battery->state & 0x02)
 738                 seq_printf(seq, "charging state:          charging\n");
 739         else
 740                 seq_printf(seq, "charging state:          charged\n");
 741
 742         if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
 743                 seq_printf(seq, "present rate:            unknown\n");
 744         else
 745                 seq_printf(seq, "present rate:            %d %s\n",
 746                            battery->rate_now, acpi_battery_units(battery));
 747
 748         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
 749                 seq_printf(seq, "remaining capacity:      unknown\n");
 750         else
 751                 seq_printf(seq, "remaining capacity:      %d %sh\n",
 752                            battery->capacity_now, acpi_battery_units(battery));
 753         if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
 754                 seq_printf(seq, "present voltage:         unknown\n");
 755         else
 756                 seq_printf(seq, "present voltage:         %d mV\n",
 757                            battery->voltage_now);
 758       end:
 759         if (result)
 760                 seq_printf(seq, "ERROR: Unable to read battery state\n");
 761
 762         return result;
 763 }
 764
 765 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
 766 {
 767         struct acpi_battery *battery = seq->private;
 768
 769         if (result)
 770                 goto end;
 771
 772         if (!acpi_battery_present(battery)) {
 773                 seq_printf(seq, "present:                 no\n");
 774                 goto end;
 775         }
 776         seq_printf(seq, "alarm:                   ");
 777         if (!battery->alarm)
 778                 seq_printf(seq, "unsupported\n");
 779         else
 780                 seq_printf(seq, "%u %sh\n", battery->alarm,
 781                                 acpi_battery_units(battery));
 782       end:
 783         if (result)
 784                 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
 785         return result;
 786 }
 787
 788 static ssize_t acpi_battery_write_alarm(struct file *file,
 789                                         const char __user * buffer,
 790                                         size_t count, loff_t * ppos)
 791 {
 792         int result = 0;
 793         char alarm_string[12] = { '\0' };
 794         struct seq_file *m = file->private_data;
 795         struct acpi_battery *battery = m->private;
 796
 797         if (!battery || (count > sizeof(alarm_string) - 1))
 798                 return -EINVAL;
 799         if (!acpi_battery_present(battery)) {
 800                 result = -ENODEV;
 801                 goto end;
 802         }
 803         if (copy_from_user(alarm_string, buffer, count)) {
 804                 result = -EFAULT;
 805                 goto end;
 806         }
 807         alarm_string[count] = '\0';
 808         battery->alarm = simple_strtol(alarm_string, NULL, 0);
 809         result = acpi_battery_set_alarm(battery);
 810       end:
 811         if (!result)
 812                 return count;
 813         return result;
 814 }
 815
 816 typedef int(*print_func)(struct seq_file *seq, int result);
 817
 818 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
 819         acpi_battery_print_info,
 820         acpi_battery_print_state,
 821         acpi_battery_print_alarm,
 822 };
 823
 824 static int acpi_battery_read(int fid, struct seq_file *seq)
 825 {
 826         struct acpi_battery *battery = seq->private;
 827         int result = acpi_battery_update(battery);
 828         return acpi_print_funcs[fid](seq, result);
 829 }
 830
 831 #define DECLARE_FILE_FUNCTIONS(_name) \
 832 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
 833 { \
 834         return acpi_battery_read(_name##_tag, seq); \
 835 } \
 836 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
 837 { \
 838         return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
 839 }
 840
 841 DECLARE_FILE_FUNCTIONS(info);
 842 DECLARE_FILE_FUNCTIONS(state);
 843 DECLARE_FILE_FUNCTIONS(alarm);
 844
 845 #undef DECLARE_FILE_FUNCTIONS
 846
 847 #define FILE_DESCRIPTION_RO(_name) \
 848         { \
 849         .name = __stringify(_name), \
 850         .mode = S_IRUGO, \
 851         .ops = { \
 852                 .open = acpi_battery_##_name##_open_fs, \
 853                 .read = seq_read, \
 854                 .llseek = seq_lseek, \
 855                 .release = single_release, \
 856                 .owner = THIS_MODULE, \
 857                 }, \
 858         }
 859
 860 #define FILE_DESCRIPTION_RW(_name) \
 861         { \
 862         .name = __stringify(_name), \
 863         .mode = S_IFREG | S_IRUGO | S_IWUSR, \
 864         .ops = { \
 865                 .open = acpi_battery_##_name##_open_fs, \
 866                 .read = seq_read, \
 867                 .llseek = seq_lseek, \
 868                 .write = acpi_battery_write_##_name, \
 869                 .release = single_release, \
 870                 .owner = THIS_MODULE, \
 871                 }, \
 872         }
 873
 874 static struct battery_file {
 875         struct file_operations ops;
 876         mode_t mode;
 877         const char *name;
 878 } acpi_battery_file[] = {
 879         FILE_DESCRIPTION_RO(info),
 880         FILE_DESCRIPTION_RO(state),
 881         FILE_DESCRIPTION_RW(alarm),
 882 };
 883
 884 #undef FILE_DESCRIPTION_RO
 885 #undef FILE_DESCRIPTION_RW
 886
 887 static int acpi_battery_add_fs(struct acpi_device *device)
 888 {
 889         struct proc_dir_entry *entry = NULL;
 890         int i;
 891
 892         printk(KERN_WARNING PREFIX "Deprecated procfs I/F for battery is loaded,"
 893                         " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
 894         if (!acpi_device_dir(device)) {
 895                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 896                                                      acpi_battery_dir);
 897                 if (!acpi_device_dir(device))
 898                         return -ENODEV;
 899         }
 900
 901         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
 902                 entry = proc_create_data(acpi_battery_file[i].name,
 903                                          acpi_battery_file[i].mode,
 904                                          acpi_device_dir(device),
 905                                          &acpi_battery_file[i].ops,
 906                                          acpi_driver_data(device));
 907                 if (!entry)
 908                         return -ENODEV;
 909         }
 910         return 0;
 911 }
 912
 913 static void acpi_battery_remove_fs(struct acpi_device *device)
 914 {
 915         int i;
 916         if (!acpi_device_dir(device))
 917                 return;
 918         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
 919                 remove_proc_entry(acpi_battery_file[i].name,
 920                                   acpi_device_dir(device));
 921
 922         remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
 923         acpi_device_dir(device) = NULL;
 924 }
 925
 926 #endif
 927
 928 /* --------------------------------------------------------------------------
 929                                  Driver Interface
 930    -------------------------------------------------------------------------- */
 931
 932 static void acpi_battery_notify(struct acpi_device *device, u32 event)
 933 {
 934         struct acpi_battery *battery = acpi_driver_data(device);
 935         struct device *old;
 936
 937         if (!battery)
 938                 return;
 939         old = battery->bat.dev;
 940         if (event == ACPI_BATTERY_NOTIFY_INFO)
 941                 acpi_battery_refresh(battery);
 942         acpi_battery_update(battery);
 943         acpi_bus_generate_proc_event(device, event,
 944                                      acpi_battery_present(battery));
 945         acpi_bus_generate_netlink_event(device->pnp.device_class,
 946                                         dev_name(&device->dev), event,
 947                                         acpi_battery_present(battery));
 948         /* acpi_battery_update could remove power_supply object */
 949         if (old && battery->bat.dev)
 950                 power_supply_changed(&battery->bat);
 951 }
 952
 953 static int battery_notify(struct notifier_block *nb,
 954                                unsigned long mode, void *_unused)
 955 {
 956         struct acpi_battery *battery = container_of(nb, struct acpi_battery,
 957                                                     pm_nb);
 958         switch (mode) {
 959         case PM_POST_SUSPEND:
 960                 sysfs_remove_battery(battery);
 961                 sysfs_add_battery(battery);
 962                 break;
 963         }
 964
 965         return 0;
 966 }
 967
 968 static int acpi_battery_add(struct acpi_device *device)
 969 {
 970         int result = 0;
 971         struct acpi_battery *battery = NULL;
 972         acpi_handle handle;
 973         if (!device)
 974                 return -EINVAL;
 975         battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
 976         if (!battery)
 977                 return -ENOMEM;
 978         battery->device = device;
 979         strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
 980         strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
 981         device->driver_data = battery;
 982         mutex_init(&battery->lock);
 983         if (ACPI_SUCCESS(acpi_get_handle(battery->device->handle,
 984                         "_BIX", &handle)))
 985                 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
 986         acpi_battery_update(battery);
 987 #ifdef CONFIG_ACPI_PROCFS_POWER
 988         result = acpi_battery_add_fs(device);
 989 #endif
 990         if (!result) {
 991                 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
 992                         ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
 993                         device->status.battery_present ? "present" : "absent");
 994         } else {
 995 #ifdef CONFIG_ACPI_PROCFS_POWER
 996                 acpi_battery_remove_fs(device);
 997 #endif
 998                 kfree(battery);
 999         }
1000
1001         battery->pm_nb.notifier_call = battery_notify;
1002         register_pm_notifier(&battery->pm_nb);
1003
1004         return result;
1005 }
1006
1007 static int acpi_battery_remove(struct acpi_device *device, int type)
1008 {
1009         struct acpi_battery *battery = NULL;
1010
1011         if (!device || !acpi_driver_data(device))
1012                 return -EINVAL;
1013         battery = acpi_driver_data(device);
1014         unregister_pm_notifier(&battery->pm_nb);
1015 #ifdef CONFIG_ACPI_PROCFS_POWER
1016         acpi_battery_remove_fs(device);
1017 #endif
1018         sysfs_remove_battery(battery);
1019         mutex_destroy(&battery->lock);
1020         kfree(battery);
1021         return 0;
1022 }
1023
1024 /* this is needed to learn about changes made in suspended state */
1025 static int acpi_battery_resume(struct acpi_device *device)
1026 {
1027         struct acpi_battery *battery;
1028         if (!device)
1029                 return -EINVAL;
1030         battery = acpi_driver_data(device);
1031         battery->update_time = 0;
1032         acpi_battery_update(battery);
1033         return 0;
1034 }
1035
1036 static struct acpi_driver acpi_battery_driver = {
1037         .name = "battery",
1038         .class = ACPI_BATTERY_CLASS,
1039         .ids = battery_device_ids,
1040         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1041         .ops = {
1042                 .add = acpi_battery_add,
1043                 .resume = acpi_battery_resume,
1044                 .remove = acpi_battery_remove,
1045                 .notify = acpi_battery_notify,
1046                 },
1047 };
1048
1049 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1050 {
1051         if (acpi_disabled)
1052                 return;
1053 #ifdef CONFIG_ACPI_PROCFS_POWER
1054         acpi_battery_dir = acpi_lock_battery_dir();
1055         if (!acpi_battery_dir)
1056                 return;
1057 #endif
1058         if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
1059 #ifdef CONFIG_ACPI_PROCFS_POWER
1060                 acpi_unlock_battery_dir(acpi_battery_dir);
1061 #endif
1062                 return;
1063         }
1064         return;
1065 }
1066
1067 static int __init acpi_battery_init(void)
1068 {
1069         async_schedule(acpi_battery_init_async, NULL);
1070         return 0;
1071 }
1072
1073 static void __exit acpi_battery_exit(void)
1074 {
1075         acpi_bus_unregister_driver(&acpi_battery_driver);
1076 #ifdef CONFIG_ACPI_PROCFS_POWER
1077         acpi_unlock_battery_dir(acpi_battery_dir);
1078 #endif
1079 }
1080
1081 module_init(acpi_battery_init);
1082 module_exit(acpi_battery_exit);