drivers/acpi/battery.c

   1 /*
   2  *  battery.c - ACPI Battery Driver (Revision: 2.0)
   3  *
   4  *  Copyright (C) 2007 Alexey Starikovskiy <[email protected]>
   5  *  Copyright (C) 2004-2007 Vladimir Lebedev <[email protected]>
   6  *  Copyright (C) 2001, 2002 Andy Grover <[email protected]>
   7  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]>
   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
  37 #ifdef CONFIG_ACPI_PROCFS_POWER
  38 #include <linux/proc_fs.h>
  39 #include <linux/seq_file.h>
  40 #include <asm/uaccess.h>
  41 #endif
  42
  43 #include <acpi/acpi_bus.h>
  44 #include <acpi/acpi_drivers.h>
  45 #include <linux/power_supply.h>
  46
  47 #define PREFIX "ACPI: "
  48
  49 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
  50
  51 #define ACPI_BATTERY_CLASS              "battery"
  52 #define ACPI_BATTERY_DEVICE_NAME        "Battery"
  53 #define ACPI_BATTERY_NOTIFY_STATUS      0x80
  54 #define ACPI_BATTERY_NOTIFY_INFO        0x81
  55 #define ACPI_BATTERY_NOTIFY_THRESHOLD   0x82
  56
  57 #define _COMPONENT              ACPI_BATTERY_COMPONENT
  58
  59 ACPI_MODULE_NAME("battery");
  60
  61 MODULE_AUTHOR("Paul Diefenbaugh");
  62 MODULE_AUTHOR("Alexey Starikovskiy <[email protected]>");
  63 MODULE_DESCRIPTION("ACPI Battery Driver");
  64 MODULE_LICENSE("GPL");
  65
  66 static unsigned int cache_time = 1000;
  67 module_param(cache_time, uint, 0644);
  68 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  69
  70 #ifdef CONFIG_ACPI_PROCFS_POWER
  71 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
  72 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
  73
  74 enum acpi_battery_files {
  75         info_tag = 0,
  76         state_tag,
  77         alarm_tag,
  78         ACPI_BATTERY_NUMFILES,
  79 };
  80
  81 #endif
  82
  83 static const struct acpi_device_id battery_device_ids[] = {
  84         {"PNP0C0A", 0},
  85         {"", 0},
  86 };
  87
  88 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
  89
  90 enum {
  91         ACPI_BATTERY_ALARM_PRESENT,
  92         ACPI_BATTERY_XINFO_PRESENT,
  93         /* For buggy DSDTs that report negative 16-bit values for either
  94          * charging or discharging current and/or report 0 as 65536
  95          * due to bad math.
  96          */
  97         ACPI_BATTERY_QUIRK_SIGNED16_CURRENT,
  98         ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
  99 };
 100
 101 struct acpi_battery {
 102         struct mutex lock;
 103         struct power_supply bat;
 104         struct acpi_device *device;
 105         unsigned long update_time;
 106         int rate_now;
 107         int capacity_now;
 108         int voltage_now;
 109         int design_capacity;
 110         int full_charge_capacity;
 111         int technology;
 112         int design_voltage;
 113         int design_capacity_warning;
 114         int design_capacity_low;
 115         int cycle_count;
 116         int measurement_accuracy;
 117         int max_sampling_time;
 118         int min_sampling_time;
 119         int max_averaging_interval;
 120         int min_averaging_interval;
 121         int capacity_granularity_1;
 122         int capacity_granularity_2;
 123         int alarm;
 124         char model_number[32];
 125         char serial_number[32];
 126         char type[32];
 127         char oem_info[32];
 128         int state;
 129         int power_unit;
 130         unsigned long flags;
 131 };
 132
 133 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
 134
 135 inline int acpi_battery_present(struct acpi_battery *battery)
 136 {
 137         return battery->device->status.battery_present;
 138 }
 139
 140 static int acpi_battery_technology(struct acpi_battery *battery)
 141 {
 142         if (!strcasecmp("NiCd", battery->type))
 143                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 144         if (!strcasecmp("NiMH", battery->type))
 145                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 146         if (!strcasecmp("LION", battery->type))
 147                 return POWER_SUPPLY_TECHNOLOGY_LION;
 148         if (!strncasecmp("LI-ION", battery->type, 6))
 149                 return POWER_SUPPLY_TECHNOLOGY_LION;
 150         if (!strcasecmp("LiP", battery->type))
 151                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 152         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 153 }
 154
 155 static int acpi_battery_get_state(struct acpi_battery *battery);
 156
 157 static int acpi_battery_is_charged(struct acpi_battery *battery)
 158 {
 159         /* either charging or discharging */
 160         if (battery->state != 0)
 161                 return 0;
 162
 163         /* battery not reporting charge */
 164         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
 165             battery->capacity_now == 0)
 166                 return 0;
 167
 168         /* good batteries update full_charge as the batteries degrade */
 169         if (battery->full_charge_capacity == battery->capacity_now)
 170                 return 1;
 171
 172         /* fallback to using design values for broken batteries */
 173         if (battery->design_capacity == battery->capacity_now)
 174                 return 1;
 175
 176         /* we don't do any sort of metric based on percentages */
 177         return 0;
 178 }
 179
 180 static int acpi_battery_get_property(struct power_supply *psy,
 181                                      enum power_supply_property psp,
 182                                      union power_supply_propval *val)
 183 {
 184         int ret = 0;
 185         struct acpi_battery *battery = to_acpi_battery(psy);
 186
 187         if (acpi_battery_present(battery)) {
 188                 /* run battery update only if it is present */
 189                 acpi_battery_get_state(battery);
 190         } else if (psp != POWER_SUPPLY_PROP_PRESENT)
 191                 return -ENODEV;
 192         switch (psp) {
 193         case POWER_SUPPLY_PROP_STATUS:
 194                 if (battery->state & 0x01)
 195                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 196                 else if (battery->state & 0x02)
 197                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 198                 else if (acpi_battery_is_charged(battery))
 199                         val->intval = POWER_SUPPLY_STATUS_FULL;
 200                 else
 201                         val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 202                 break;
 203         case POWER_SUPPLY_PROP_PRESENT:
 204                 val->intval = acpi_battery_present(battery);
 205                 break;
 206         case POWER_SUPPLY_PROP_TECHNOLOGY:
 207                 val->intval = acpi_battery_technology(battery);
 208                 break;
 209         case POWER_SUPPLY_PROP_CYCLE_COUNT:
 210                 val->intval = battery->cycle_count;
 211                 break;
 212         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 213                 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 214                         ret = -ENODEV;
 215                 else
 216                         val->intval = battery->design_voltage * 1000;
 217                 break;
 218         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 219                 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
 220                         ret = -ENODEV;
 221                 else
 222                         val->intval = battery->voltage_now * 1000;
 223                 break;
 224         case POWER_SUPPLY_PROP_CURRENT_NOW:
 225         case POWER_SUPPLY_PROP_POWER_NOW:
 226                 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
 227                         ret = -ENODEV;
 228                 else
 229                         val->intval = battery->rate_now * 1000;
 230                 break;
 231         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 232         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 233                 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 234                         ret = -ENODEV;
 235                 else
 236                         val->intval = battery->design_capacity * 1000;
 237                 break;
 238         case POWER_SUPPLY_PROP_CHARGE_FULL:
 239         case POWER_SUPPLY_PROP_ENERGY_FULL:
 240                 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 241                         ret = -ENODEV;
 242                 else
 243                         val->intval = battery->full_charge_capacity * 1000;
 244                 break;
 245         case POWER_SUPPLY_PROP_CHARGE_NOW:
 246         case POWER_SUPPLY_PROP_ENERGY_NOW:
 247                 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
 248                         ret = -ENODEV;
 249                 else
 250                         val->intval = battery->capacity_now * 1000;
 251                 break;
 252         case POWER_SUPPLY_PROP_MODEL_NAME:
 253                 val->strval = battery->model_number;
 254                 break;
 255         case POWER_SUPPLY_PROP_MANUFACTURER:
 256                 val->strval = battery->oem_info;
 257                 break;
 258         case POWER_SUPPLY_PROP_SERIAL_NUMBER:
 259                 val->strval = battery->serial_number;
 260                 break;
 261         default:
 262                 ret = -EINVAL;
 263         }
 264         return ret;
 265 }
 266
 267 static enum power_supply_property charge_battery_props[] = {
 268         POWER_SUPPLY_PROP_STATUS,
 269         POWER_SUPPLY_PROP_PRESENT,
 270         POWER_SUPPLY_PROP_TECHNOLOGY,
 271         POWER_SUPPLY_PROP_CYCLE_COUNT,
 272         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 273         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 274         POWER_SUPPLY_PROP_CURRENT_NOW,
 275         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 276         POWER_SUPPLY_PROP_CHARGE_FULL,
 277         POWER_SUPPLY_PROP_CHARGE_NOW,
 278         POWER_SUPPLY_PROP_MODEL_NAME,
 279         POWER_SUPPLY_PROP_MANUFACTURER,
 280         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 281 };
 282
 283 static enum power_supply_property energy_battery_props[] = {
 284         POWER_SUPPLY_PROP_STATUS,
 285         POWER_SUPPLY_PROP_PRESENT,
 286         POWER_SUPPLY_PROP_TECHNOLOGY,
 287         POWER_SUPPLY_PROP_CYCLE_COUNT,
 288         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 289         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 290         POWER_SUPPLY_PROP_POWER_NOW,
 291         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 292         POWER_SUPPLY_PROP_ENERGY_FULL,
 293         POWER_SUPPLY_PROP_ENERGY_NOW,
 294         POWER_SUPPLY_PROP_MODEL_NAME,
 295         POWER_SUPPLY_PROP_MANUFACTURER,
 296         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 297 };
 298
 299 #ifdef CONFIG_ACPI_PROCFS_POWER
 300 inline char *acpi_battery_units(struct acpi_battery *battery)
 301 {
 302         return (battery->power_unit)?"mA":"mW";
 303 }
 304 #endif
 305
 306 /* --------------------------------------------------------------------------
 307                                Battery Management
 308    -------------------------------------------------------------------------- */
 309 struct acpi_offsets {
 310         size_t offset;          /* offset inside struct acpi_sbs_battery */
 311         u8 mode;                /* int or string? */
 312 };
 313
 314 static struct acpi_offsets state_offsets[] = {
 315         {offsetof(struct acpi_battery, state), 0},
 316         {offsetof(struct acpi_battery, rate_now), 0},
 317         {offsetof(struct acpi_battery, capacity_now), 0},
 318         {offsetof(struct acpi_battery, voltage_now), 0},
 319 };
 320
 321 static struct acpi_offsets info_offsets[] = {
 322         {offsetof(struct acpi_battery, power_unit), 0},
 323         {offsetof(struct acpi_battery, design_capacity), 0},
 324         {offsetof(struct acpi_battery, full_charge_capacity), 0},
 325         {offsetof(struct acpi_battery, technology), 0},
 326         {offsetof(struct acpi_battery, design_voltage), 0},
 327         {offsetof(struct acpi_battery, design_capacity_warning), 0},
 328         {offsetof(struct acpi_battery, design_capacity_low), 0},
 329         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
 330         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
 331         {offsetof(struct acpi_battery, model_number), 1},
 332         {offsetof(struct acpi_battery, serial_number), 1},
 333         {offsetof(struct acpi_battery, type), 1},
 334         {offsetof(struct acpi_battery, oem_info), 1},
 335 };
 336
 337 static struct acpi_offsets extended_info_offsets[] = {
 338         {offsetof(struct acpi_battery, power_unit), 0},
 339         {offsetof(struct acpi_battery, design_capacity), 0},
 340         {offsetof(struct acpi_battery, full_charge_capacity), 0},
 341         {offsetof(struct acpi_battery, technology), 0},
 342         {offsetof(struct acpi_battery, design_voltage), 0},
 343         {offsetof(struct acpi_battery, design_capacity_warning), 0},
 344         {offsetof(struct acpi_battery, design_capacity_low), 0},
 345         {offsetof(struct acpi_battery, cycle_count), 0},
 346         {offsetof(struct acpi_battery, measurement_accuracy), 0},
 347         {offsetof(struct acpi_battery, max_sampling_time), 0},
 348         {offsetof(struct acpi_battery, min_sampling_time), 0},
 349         {offsetof(struct acpi_battery, max_averaging_interval), 0},
 350         {offsetof(struct acpi_battery, min_averaging_interval), 0},
 351         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
 352         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
 353         {offsetof(struct acpi_battery, model_number), 1},
 354         {offsetof(struct acpi_battery, serial_number), 1},
 355         {offsetof(struct acpi_battery, type), 1},
 356         {offsetof(struct acpi_battery, oem_info), 1},
 357 };
 358
 359 static int extract_package(struct acpi_battery *battery,
 360                            union acpi_object *package,
 361                            struct acpi_offsets *offsets, int num)
 362 {
 363         int i;
 364         union acpi_object *element;
 365         if (package->type != ACPI_TYPE_PACKAGE)
 366                 return -EFAULT;
 367         for (i = 0; i < num; ++i) {
 368                 if (package->package.count <= i)
 369                         return -EFAULT;
 370                 element = &package->package.elements[i];
 371                 if (offsets[i].mode) {
 372                         u8 *ptr = (u8 *)battery + offsets[i].offset;
 373                         if (element->type == ACPI_TYPE_STRING ||
 374                             element->type == ACPI_TYPE_BUFFER)
 375                                 strncpy(ptr, element->string.pointer, 32);
 376                         else if (element->type == ACPI_TYPE_INTEGER) {
 377                                 strncpy(ptr, (u8 *)&element->integer.value,
 378                                         sizeof(u64));
 379                                 ptr[sizeof(u64)] = 0;
 380                         } else
 381                                 *ptr = 0; /* don't have value */
 382                 } else {
 383                         int *x = (int *)((u8 *)battery + offsets[i].offset);
 384                         *x = (element->type == ACPI_TYPE_INTEGER) ?
 385                                 element->integer.value : -1;
 386                 }
 387         }
 388         return 0;
 389 }
 390
 391 static int acpi_battery_get_status(struct acpi_battery *battery)
 392 {
 393         if (acpi_bus_get_status(battery->device)) {
 394                 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
 395                 return -ENODEV;
 396         }
 397         return 0;
 398 }
 399
 400 static int acpi_battery_get_info(struct acpi_battery *battery)
 401 {
 402         int result = -EFAULT;
 403         acpi_status status = 0;
 404         char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags)?
 405                         "_BIX" : "_BIF";
 406
 407         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 408
 409         if (!acpi_battery_present(battery))
 410                 return 0;
 411         mutex_lock(&battery->lock);
 412         status = acpi_evaluate_object(battery->device->handle, name,
 413                                                 NULL, &buffer);
 414         mutex_unlock(&battery->lock);
 415
 416         if (ACPI_FAILURE(status)) {
 417                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name));
 418                 return -ENODEV;
 419         }
 420         if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags))
 421                 result = extract_package(battery, buffer.pointer,
 422                                 extended_info_offsets,
 423                                 ARRAY_SIZE(extended_info_offsets));
 424         else
 425                 result = extract_package(battery, buffer.pointer,
 426                                 info_offsets, ARRAY_SIZE(info_offsets));
 427         kfree(buffer.pointer);
 428         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
 429                 battery->full_charge_capacity = battery->design_capacity;
 430         return result;
 431 }
 432
 433 static int acpi_battery_get_state(struct acpi_battery *battery)
 434 {
 435         int result = 0;
 436         acpi_status status = 0;
 437         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 438
 439         if (!acpi_battery_present(battery))
 440                 return 0;
 441
 442         if (battery->update_time &&
 443             time_before(jiffies, battery->update_time +
 444                         msecs_to_jiffies(cache_time)))
 445                 return 0;
 446
 447         mutex_lock(&battery->lock);
 448         status = acpi_evaluate_object(battery->device->handle, "_BST",
 449                                       NULL, &buffer);
 450         mutex_unlock(&battery->lock);
 451
 452         if (ACPI_FAILURE(status)) {
 453                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
 454                 return -ENODEV;
 455         }
 456
 457         result = extract_package(battery, buffer.pointer,
 458                                  state_offsets, ARRAY_SIZE(state_offsets));
 459         battery->update_time = jiffies;
 460         kfree(buffer.pointer);
 461
 462         if (test_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags) &&
 463             battery->rate_now != -1)
 464                 battery->rate_now = abs((s16)battery->rate_now);
 465
 466         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
 467             && battery->capacity_now >= 0 && battery->capacity_now <= 100)
 468                 battery->capacity_now = (battery->capacity_now *
 469                                 battery->full_charge_capacity) / 100;
 470         return result;
 471 }
 472
 473 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 474 {
 475         acpi_status status = 0;
 476         union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
 477         struct acpi_object_list arg_list = { 1, &arg0 };
 478
 479         if (!acpi_battery_present(battery) ||
 480             !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
 481                 return -ENODEV;
 482
 483         arg0.integer.value = battery->alarm;
 484
 485         mutex_lock(&battery->lock);
 486         status = acpi_evaluate_object(battery->device->handle, "_BTP",
 487                                  &arg_list, NULL);
 488         mutex_unlock(&battery->lock);
 489
 490         if (ACPI_FAILURE(status))
 491                 return -ENODEV;
 492
 493         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
 494         return 0;
 495 }
 496
 497 static int acpi_battery_init_alarm(struct acpi_battery *battery)
 498 {
 499         acpi_status status = AE_OK;
 500         acpi_handle handle = NULL;
 501
 502         /* See if alarms are supported, and if so, set default */
 503         status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
 504         if (ACPI_FAILURE(status)) {
 505                 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
 506                 return 0;
 507         }
 508         set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
 509         if (!battery->alarm)
 510                 battery->alarm = battery->design_capacity_warning;
 511         return acpi_battery_set_alarm(battery);
 512 }
 513
 514 static ssize_t acpi_battery_alarm_show(struct device *dev,
 515                                         struct device_attribute *attr,
 516                                         char *buf)
 517 {
 518         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 519         return sprintf(buf, "%d\n", battery->alarm * 1000);
 520 }
 521
 522 static ssize_t acpi_battery_alarm_store(struct device *dev,
 523                                         struct device_attribute *attr,
 524                                         const char *buf, size_t count)
 525 {
 526         unsigned long x;
 527         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 528         if (sscanf(buf, "%ld\n", &x) == 1)
 529                 battery->alarm = x/1000;
 530         if (acpi_battery_present(battery))
 531                 acpi_battery_set_alarm(battery);
 532         return count;
 533 }
 534
 535 static struct device_attribute alarm_attr = {
 536         .attr = {.name = "alarm", .mode = 0644},
 537         .show = acpi_battery_alarm_show,
 538         .store = acpi_battery_alarm_store,
 539 };
 540
 541 static int sysfs_add_battery(struct acpi_battery *battery)
 542 {
 543         int result;
 544
 545         if (battery->power_unit) {
 546                 battery->bat.properties = charge_battery_props;
 547                 battery->bat.num_properties =
 548                         ARRAY_SIZE(charge_battery_props);
 549         } else {
 550                 battery->bat.properties = energy_battery_props;
 551                 battery->bat.num_properties =
 552                         ARRAY_SIZE(energy_battery_props);
 553         }
 554
 555         battery->bat.name = acpi_device_bid(battery->device);
 556         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 557         battery->bat.get_property = acpi_battery_get_property;
 558
 559         result = power_supply_register(&battery->device->dev, &battery->bat);
 560         if (result)
 561                 return result;
 562         return device_create_file(battery->bat.dev, &alarm_attr);
 563 }
 564
 565 static void sysfs_remove_battery(struct acpi_battery *battery)
 566 {
 567         if (!battery->bat.dev)
 568                 return;
 569         device_remove_file(battery->bat.dev, &alarm_attr);
 570         power_supply_unregister(&battery->bat);
 571         battery->bat.dev = NULL;
 572 }
 573
 574 static void acpi_battery_quirks(struct acpi_battery *battery)
 575 {
 576         if (dmi_name_in_vendors("Acer") && battery->power_unit) {
 577                 set_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags);
 578         }
 579 }
 580
 581 /*
 582  * According to the ACPI spec, some kinds of primary batteries can
 583  * report percentage battery remaining capacity directly to OS.
 584  * In this case, it reports the Last Full Charged Capacity == 100
 585  * and BatteryPresentRate == 0xFFFFFFFF.
 586  *
 587  * Now we found some battery reports percentage remaining capacity
 588  * even if it's rechargeable.
 589  * https://bugzilla.kernel.org/show_bug.cgi?id=15979
 590  *
 591  * Handle this correctly so that they won't break userspace.
 592  */
 593 static void acpi_battery_quirks2(struct acpi_battery *battery)
 594 {
 595         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
 596                 return ;
 597
 598         if (battery->full_charge_capacity == 100 &&
 599             battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
 600             battery->capacity_now >=0 && battery->capacity_now <= 100) {
 601                 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
 602                 battery->full_charge_capacity = battery->design_capacity;
 603                 battery->capacity_now = (battery->capacity_now *
 604                                 battery->full_charge_capacity) / 100;
 605         }
 606 }
 607
 608 static int acpi_battery_update(struct acpi_battery *battery)
 609 {
 610         int result, old_present = acpi_battery_present(battery);
 611         result = acpi_battery_get_status(battery);
 612         if (result)
 613                 return result;
 614         if (!acpi_battery_present(battery)) {
 615                 sysfs_remove_battery(battery);
 616                 battery->update_time = 0;
 617                 return 0;
 618         }
 619         if (!battery->update_time ||
 620             old_present != acpi_battery_present(battery)) {
 621                 result = acpi_battery_get_info(battery);
 622                 if (result)
 623                         return result;
 624                 acpi_battery_quirks(battery);
 625                 acpi_battery_init_alarm(battery);
 626         }
 627         if (!battery->bat.dev)
 628                 sysfs_add_battery(battery);
 629         result = acpi_battery_get_state(battery);
 630         acpi_battery_quirks2(battery);
 631         return result;
 632 }
 633
 634 /* --------------------------------------------------------------------------
 635                               FS Interface (/proc)
 636    -------------------------------------------------------------------------- */
 637
 638 #ifdef CONFIG_ACPI_PROCFS_POWER
 639 static struct proc_dir_entry *acpi_battery_dir;
 640
 641 static int acpi_battery_print_info(struct seq_file *seq, int result)
 642 {
 643         struct acpi_battery *battery = seq->private;
 644
 645         if (result)
 646                 goto end;
 647
 648         seq_printf(seq, "present:                 %s\n",
 649                    acpi_battery_present(battery)?"yes":"no");
 650         if (!acpi_battery_present(battery))
 651                 goto end;
 652         if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 653                 seq_printf(seq, "design capacity:         unknown\n");
 654         else
 655                 seq_printf(seq, "design capacity:         %d %sh\n",
 656                            battery->design_capacity,
 657                            acpi_battery_units(battery));
 658
 659         if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 660                 seq_printf(seq, "last full capacity:      unknown\n");
 661         else
 662                 seq_printf(seq, "last full capacity:      %d %sh\n",
 663                            battery->full_charge_capacity,
 664                            acpi_battery_units(battery));
 665
 666         seq_printf(seq, "battery technology:      %srechargeable\n",
 667                    (!battery->technology)?"non-":"");
 668
 669         if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 670                 seq_printf(seq, "design voltage:          unknown\n");
 671         else
 672                 seq_printf(seq, "design voltage:          %d mV\n",
 673                            battery->design_voltage);
 674         seq_printf(seq, "design capacity warning: %d %sh\n",
 675                    battery->design_capacity_warning,
 676                    acpi_battery_units(battery));
 677         seq_printf(seq, "design capacity low:     %d %sh\n",
 678                    battery->design_capacity_low,
 679                    acpi_battery_units(battery));
 680         seq_printf(seq, "cycle count:             %i\n", battery->cycle_count);
 681         seq_printf(seq, "capacity granularity 1:  %d %sh\n",
 682                    battery->capacity_granularity_1,
 683                    acpi_battery_units(battery));
 684         seq_printf(seq, "capacity granularity 2:  %d %sh\n",
 685                    battery->capacity_granularity_2,
 686                    acpi_battery_units(battery));
 687         seq_printf(seq, "model number:            %s\n", battery->model_number);
 688         seq_printf(seq, "serial number:           %s\n", battery->serial_number);
 689         seq_printf(seq, "battery type:            %s\n", battery->type);
 690         seq_printf(seq, "OEM info:                %s\n", battery->oem_info);
 691       end:
 692         if (result)
 693                 seq_printf(seq, "ERROR: Unable to read battery info\n");
 694         return result;
 695 }
 696
 697 static int acpi_battery_print_state(struct seq_file *seq, int result)
 698 {
 699         struct acpi_battery *battery = seq->private;
 700
 701         if (result)
 702                 goto end;
 703
 704         seq_printf(seq, "present:                 %s\n",
 705                    acpi_battery_present(battery)?"yes":"no");
 706         if (!acpi_battery_present(battery))
 707                 goto end;
 708
 709         seq_printf(seq, "capacity state:          %s\n",
 710                         (battery->state & 0x04)?"critical":"ok");
 711         if ((battery->state & 0x01) && (battery->state & 0x02))
 712                 seq_printf(seq,
 713                            "charging state:          charging/discharging\n");
 714         else if (battery->state & 0x01)
 715                 seq_printf(seq, "charging state:          discharging\n");
 716         else if (battery->state & 0x02)
 717                 seq_printf(seq, "charging state:          charging\n");
 718         else
 719                 seq_printf(seq, "charging state:          charged\n");
 720
 721         if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
 722                 seq_printf(seq, "present rate:            unknown\n");
 723         else
 724                 seq_printf(seq, "present rate:            %d %s\n",
 725                            battery->rate_now, acpi_battery_units(battery));
 726
 727         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
 728                 seq_printf(seq, "remaining capacity:      unknown\n");
 729         else
 730                 seq_printf(seq, "remaining capacity:      %d %sh\n",
 731                            battery->capacity_now, acpi_battery_units(battery));
 732         if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
 733                 seq_printf(seq, "present voltage:         unknown\n");
 734         else
 735                 seq_printf(seq, "present voltage:         %d mV\n",
 736                            battery->voltage_now);
 737       end:
 738         if (result)
 739                 seq_printf(seq, "ERROR: Unable to read battery state\n");
 740
 741         return result;
 742 }
 743
 744 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
 745 {
 746         struct acpi_battery *battery = seq->private;
 747
 748         if (result)
 749                 goto end;
 750
 751         if (!acpi_battery_present(battery)) {
 752                 seq_printf(seq, "present:                 no\n");
 753                 goto end;
 754         }
 755         seq_printf(seq, "alarm:                   ");
 756         if (!battery->alarm)
 757                 seq_printf(seq, "unsupported\n");
 758         else
 759                 seq_printf(seq, "%u %sh\n", battery->alarm,
 760                                 acpi_battery_units(battery));
 761       end:
 762         if (result)
 763                 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
 764         return result;
 765 }
 766
 767 static ssize_t acpi_battery_write_alarm(struct file *file,
 768                                         const char __user * buffer,
 769                                         size_t count, loff_t * ppos)
 770 {
 771         int result = 0;
 772         char alarm_string[12] = { '\0' };
 773         struct seq_file *m = file->private_data;
 774         struct acpi_battery *battery = m->private;
 775
 776         if (!battery || (count > sizeof(alarm_string) - 1))
 777                 return -EINVAL;
 778         if (!acpi_battery_present(battery)) {
 779                 result = -ENODEV;
 780                 goto end;
 781         }
 782         if (copy_from_user(alarm_string, buffer, count)) {
 783                 result = -EFAULT;
 784                 goto end;
 785         }
 786         alarm_string[count] = '\0';
 787         battery->alarm = simple_strtol(alarm_string, NULL, 0);
 788         result = acpi_battery_set_alarm(battery);
 789       end:
 790         if (!result)
 791                 return count;
 792         return result;
 793 }
 794
 795 typedef int(*print_func)(struct seq_file *seq, int result);
 796
 797 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
 798         acpi_battery_print_info,
 799         acpi_battery_print_state,
 800         acpi_battery_print_alarm,
 801 };
 802
 803 static int acpi_battery_read(int fid, struct seq_file *seq)
 804 {
 805         struct acpi_battery *battery = seq->private;
 806         int result = acpi_battery_update(battery);
 807         return acpi_print_funcs[fid](seq, result);
 808 }
 809
 810 #define DECLARE_FILE_FUNCTIONS(_name) \
 811 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
 812 { \
 813         return acpi_battery_read(_name##_tag, seq); \
 814 } \
 815 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
 816 { \
 817         return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
 818 }
 819
 820 DECLARE_FILE_FUNCTIONS(info);
 821 DECLARE_FILE_FUNCTIONS(state);
 822 DECLARE_FILE_FUNCTIONS(alarm);
 823
 824 #undef DECLARE_FILE_FUNCTIONS
 825
 826 #define FILE_DESCRIPTION_RO(_name) \
 827         { \
 828         .name = __stringify(_name), \
 829         .mode = S_IRUGO, \
 830         .ops = { \
 831                 .open = acpi_battery_##_name##_open_fs, \
 832                 .read = seq_read, \
 833                 .llseek = seq_lseek, \
 834                 .release = single_release, \
 835                 .owner = THIS_MODULE, \
 836                 }, \
 837         }
 838
 839 #define FILE_DESCRIPTION_RW(_name) \
 840         { \
 841         .name = __stringify(_name), \
 842         .mode = S_IFREG | S_IRUGO | S_IWUSR, \
 843         .ops = { \
 844                 .open = acpi_battery_##_name##_open_fs, \
 845                 .read = seq_read, \
 846                 .llseek = seq_lseek, \
 847                 .write = acpi_battery_write_##_name, \
 848                 .release = single_release, \
 849                 .owner = THIS_MODULE, \
 850                 }, \
 851         }
 852
 853 static struct battery_file {
 854         struct file_operations ops;
 855         mode_t mode;
 856         const char *name;
 857 } acpi_battery_file[] = {
 858         FILE_DESCRIPTION_RO(info),
 859         FILE_DESCRIPTION_RO(state),
 860         FILE_DESCRIPTION_RW(alarm),
 861 };
 862
 863 #undef FILE_DESCRIPTION_RO
 864 #undef FILE_DESCRIPTION_RW
 865
 866 static int acpi_battery_add_fs(struct acpi_device *device)
 867 {
 868         struct proc_dir_entry *entry = NULL;
 869         int i;
 870
 871         if (!acpi_device_dir(device)) {
 872                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 873                                                      acpi_battery_dir);
 874                 if (!acpi_device_dir(device))
 875                         return -ENODEV;
 876         }
 877
 878         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
 879                 entry = proc_create_data(acpi_battery_file[i].name,
 880                                          acpi_battery_file[i].mode,
 881                                          acpi_device_dir(device),
 882                                          &acpi_battery_file[i].ops,
 883                                          acpi_driver_data(device));
 884                 if (!entry)
 885                         return -ENODEV;
 886         }
 887         return 0;
 888 }
 889
 890 static void acpi_battery_remove_fs(struct acpi_device *device)
 891 {
 892         int i;
 893         if (!acpi_device_dir(device))
 894                 return;
 895         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
 896                 remove_proc_entry(acpi_battery_file[i].name,
 897                                   acpi_device_dir(device));
 898
 899         remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
 900         acpi_device_dir(device) = NULL;
 901 }
 902
 903 #endif
 904
 905 /* --------------------------------------------------------------------------
 906                                  Driver Interface
 907    -------------------------------------------------------------------------- */
 908
 909 static void acpi_battery_notify(struct acpi_device *device, u32 event)
 910 {
 911         struct acpi_battery *battery = acpi_driver_data(device);
 912         struct device *old;
 913
 914         if (!battery)
 915                 return;
 916         old = battery->bat.dev;
 917         acpi_battery_update(battery);
 918         acpi_bus_generate_proc_event(device, event,
 919                                      acpi_battery_present(battery));
 920         acpi_bus_generate_netlink_event(device->pnp.device_class,
 921                                         dev_name(&device->dev), event,
 922                                         acpi_battery_present(battery));
 923         /* acpi_battery_update could remove power_supply object */
 924         if (old && battery->bat.dev)
 925                 power_supply_changed(&battery->bat);
 926 }
 927
 928 static int acpi_battery_add(struct acpi_device *device)
 929 {
 930         int result = 0;
 931         struct acpi_battery *battery = NULL;
 932         acpi_handle handle;
 933         if (!device)
 934                 return -EINVAL;
 935         battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
 936         if (!battery)
 937                 return -ENOMEM;
 938         battery->device = device;
 939         strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
 940         strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
 941         device->driver_data = battery;
 942         mutex_init(&battery->lock);
 943         if (ACPI_SUCCESS(acpi_get_handle(battery->device->handle,
 944                         "_BIX", &handle)))
 945                 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
 946         acpi_battery_update(battery);
 947 #ifdef CONFIG_ACPI_PROCFS_POWER
 948         result = acpi_battery_add_fs(device);
 949 #endif
 950         if (!result) {
 951                 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
 952                         ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
 953                         device->status.battery_present ? "present" : "absent");
 954         } else {
 955 #ifdef CONFIG_ACPI_PROCFS_POWER
 956                 acpi_battery_remove_fs(device);
 957 #endif
 958                 kfree(battery);
 959         }
 960         return result;
 961 }
 962
 963 static int acpi_battery_remove(struct acpi_device *device, int type)
 964 {
 965         struct acpi_battery *battery = NULL;
 966
 967         if (!device || !acpi_driver_data(device))
 968                 return -EINVAL;
 969         battery = acpi_driver_data(device);
 970 #ifdef CONFIG_ACPI_PROCFS_POWER
 971         acpi_battery_remove_fs(device);
 972 #endif
 973         sysfs_remove_battery(battery);
 974         mutex_destroy(&battery->lock);
 975         kfree(battery);
 976         return 0;
 977 }
 978
 979 /* this is needed to learn about changes made in suspended state */
 980 static int acpi_battery_resume(struct acpi_device *device)
 981 {
 982         struct acpi_battery *battery;
 983         if (!device)
 984                 return -EINVAL;
 985         battery = acpi_driver_data(device);
 986         battery->update_time = 0;
 987         acpi_battery_update(battery);
 988         return 0;
 989 }
 990
 991 static struct acpi_driver acpi_battery_driver = {
 992         .name = "battery",
 993         .class = ACPI_BATTERY_CLASS,
 994         .ids = battery_device_ids,
 995         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
 996         .ops = {
 997                 .add = acpi_battery_add,
 998                 .resume = acpi_battery_resume,
 999                 .remove = acpi_battery_remove,
1000                 .notify = acpi_battery_notify,
1001                 },
1002 };
1003
1004 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1005 {
1006         if (acpi_disabled)
1007                 return;
1008 #ifdef CONFIG_ACPI_PROCFS_POWER
1009         acpi_battery_dir = acpi_lock_battery_dir();
1010         if (!acpi_battery_dir)
1011                 return;
1012 #endif
1013         if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
1014 #ifdef CONFIG_ACPI_PROCFS_POWER
1015                 acpi_unlock_battery_dir(acpi_battery_dir);
1016 #endif
1017                 return;
1018         }
1019         return;
1020 }
1021
1022 static int __init acpi_battery_init(void)
1023 {
1024         async_schedule(acpi_battery_init_async, NULL);
1025         return 0;
1026 }
1027
1028 static void __exit acpi_battery_exit(void)
1029 {
1030         acpi_bus_unregister_driver(&acpi_battery_driver);
1031 #ifdef CONFIG_ACPI_PROCFS_POWER
1032         acpi_unlock_battery_dir(acpi_battery_dir);
1033 #endif
1034 }
1035
1036 module_init(acpi_battery_init);
1037 module_exit(acpi_battery_exit);