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 /* Battery power unit: 0 means mW, 1 means mA */
  59 #define ACPI_BATTERY_POWER_UNIT_MA      1
  60
  61 #define _COMPONENT              ACPI_BATTERY_COMPONENT
  62
  63 ACPI_MODULE_NAME("battery");
  64
  65 MODULE_AUTHOR("Paul Diefenbaugh");
  66 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
  67 MODULE_DESCRIPTION("ACPI Battery Driver");
  68 MODULE_LICENSE("GPL");
  69
  70 static unsigned int cache_time = 1000;
  71 module_param(cache_time, uint, 0644);
  72 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  73
  74 #ifdef CONFIG_ACPI_PROCFS_POWER
  75 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
  76 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
  77
  78 enum acpi_battery_files {
  79         info_tag = 0,
  80         state_tag,
  81         alarm_tag,
  82         ACPI_BATTERY_NUMFILES,
  83 };
  84
  85 #endif
  86
  87 static const struct acpi_device_id battery_device_ids[] = {
  88         {"PNP0C0A", 0},
  89         {"", 0},
  90 };
  91
  92 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
  93
  94 enum {
  95         ACPI_BATTERY_ALARM_PRESENT,
  96         ACPI_BATTERY_XINFO_PRESENT,
  97         ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
  98 };
  99
 100 struct acpi_battery {
 101         struct mutex lock;
 102         struct mutex sysfs_lock;
 103         struct power_supply bat;
 104         struct acpi_device *device;
 105         struct notifier_block pm_nb;
 106         unsigned long update_time;
 107         int rate_now;
 108         int capacity_now;
 109         int voltage_now;
 110         int design_capacity;
 111         int full_charge_capacity;
 112         int technology;
 113         int design_voltage;
 114         int design_capacity_warning;
 115         int design_capacity_low;
 116         int cycle_count;
 117         int measurement_accuracy;
 118         int max_sampling_time;
 119         int min_sampling_time;
 120         int max_averaging_interval;
 121         int min_averaging_interval;
 122         int capacity_granularity_1;
 123         int capacity_granularity_2;
 124         int alarm;
 125         char model_number[32];
 126         char serial_number[32];
 127         char type[32];
 128         char oem_info[32];
 129         int state;
 130         int power_unit;
 131         unsigned long flags;
 132 };
 133
 134 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat)
 135
 136 inline int acpi_battery_present(struct acpi_battery *battery)
 137 {
 138         return battery->device->status.battery_present;
 139 }
 140
 141 static int acpi_battery_technology(struct acpi_battery *battery)
 142 {
 143         if (!strcasecmp("NiCd", battery->type))
 144                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 145         if (!strcasecmp("NiMH", battery->type))
 146                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 147         if (!strcasecmp("LION", battery->type))
 148                 return POWER_SUPPLY_TECHNOLOGY_LION;
 149         if (!strncasecmp("LI-ION", battery->type, 6))
 150                 return POWER_SUPPLY_TECHNOLOGY_LION;
 151         if (!strcasecmp("LiP", battery->type))
 152                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 153         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 154 }
 155
 156 static int acpi_battery_get_state(struct acpi_battery *battery);
 157
 158 static int acpi_battery_is_charged(struct acpi_battery *battery)
 159 {
 160         /* either charging or discharging */
 161         if (battery->state != 0)
 162                 return 0;
 163
 164         /* battery not reporting charge */
 165         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
 166             battery->capacity_now == 0)
 167                 return 0;
 168
 169         /* good batteries update full_charge as the batteries degrade */
 170         if (battery->full_charge_capacity == battery->capacity_now)
 171                 return 1;
 172
 173         /* fallback to using design values for broken batteries */
 174         if (battery->design_capacity == battery->capacity_now)
 175                 return 1;
 176
 177         /* we don't do any sort of metric based on percentages */
 178         return 0;
 179 }
 180
 181 static int acpi_battery_get_property(struct power_supply *psy,
 182                                      enum power_supply_property psp,
 183                                      union power_supply_propval *val)
 184 {
 185         int ret = 0;
 186         struct acpi_battery *battery = to_acpi_battery(psy);
 187
 188         if (acpi_battery_present(battery)) {
 189                 /* run battery update only if it is present */
 190                 acpi_battery_get_state(battery);
 191         } else if (psp != POWER_SUPPLY_PROP_PRESENT)
 192                 return -ENODEV;
 193         switch (psp) {
 194         case POWER_SUPPLY_PROP_STATUS:
 195                 if (battery->state & 0x01)
 196                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 197                 else if (battery->state & 0x02)
 198                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 199                 else if (acpi_battery_is_charged(battery))
 200                         val->intval = POWER_SUPPLY_STATUS_FULL;
 201                 else
 202                         val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 203                 break;
 204         case POWER_SUPPLY_PROP_PRESENT:
 205                 val->intval = acpi_battery_present(battery);
 206                 break;
 207         case POWER_SUPPLY_PROP_TECHNOLOGY:
 208                 val->intval = acpi_battery_technology(battery);
 209                 break;
 210         case POWER_SUPPLY_PROP_CYCLE_COUNT:
 211                 val->intval = battery->cycle_count;
 212                 break;
 213         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 214                 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 215                         ret = -ENODEV;
 216                 else
 217                         val->intval = battery->design_voltage * 1000;
 218                 break;
 219         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 220                 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
 221                         ret = -ENODEV;
 222                 else
 223                         val->intval = battery->voltage_now * 1000;
 224                 break;
 225         case POWER_SUPPLY_PROP_CURRENT_NOW:
 226         case POWER_SUPPLY_PROP_POWER_NOW:
 227                 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
 228                         ret = -ENODEV;
 229                 else
 230                         val->intval = battery->rate_now * 1000;
 231                 break;
 232         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 233         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 234                 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 235                         ret = -ENODEV;
 236                 else
 237                         val->intval = battery->design_capacity * 1000;
 238                 break;
 239         case POWER_SUPPLY_PROP_CHARGE_FULL:
 240         case POWER_SUPPLY_PROP_ENERGY_FULL:
 241                 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 242                         ret = -ENODEV;
 243                 else
 244                         val->intval = battery->full_charge_capacity * 1000;
 245                 break;
 246         case POWER_SUPPLY_PROP_CHARGE_NOW:
 247         case POWER_SUPPLY_PROP_ENERGY_NOW:
 248                 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
 249                         ret = -ENODEV;
 250                 else
 251                         val->intval = battery->capacity_now * 1000;
 252                 break;
 253         case POWER_SUPPLY_PROP_MODEL_NAME:
 254                 val->strval = battery->model_number;
 255                 break;
 256         case POWER_SUPPLY_PROP_MANUFACTURER:
 257                 val->strval = battery->oem_info;
 258                 break;
 259         case POWER_SUPPLY_PROP_SERIAL_NUMBER:
 260                 val->strval = battery->serial_number;
 261                 break;
 262         default:
 263                 ret = -EINVAL;
 264         }
 265         return ret;
 266 }
 267
 268 static enum power_supply_property charge_battery_props[] = {
 269         POWER_SUPPLY_PROP_STATUS,
 270         POWER_SUPPLY_PROP_PRESENT,
 271         POWER_SUPPLY_PROP_TECHNOLOGY,
 272         POWER_SUPPLY_PROP_CYCLE_COUNT,
 273         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 274         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 275         POWER_SUPPLY_PROP_CURRENT_NOW,
 276         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 277         POWER_SUPPLY_PROP_CHARGE_FULL,
 278         POWER_SUPPLY_PROP_CHARGE_NOW,
 279         POWER_SUPPLY_PROP_MODEL_NAME,
 280         POWER_SUPPLY_PROP_MANUFACTURER,
 281         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 282 };
 283
 284 static enum power_supply_property energy_battery_props[] = {
 285         POWER_SUPPLY_PROP_STATUS,
 286         POWER_SUPPLY_PROP_PRESENT,
 287         POWER_SUPPLY_PROP_TECHNOLOGY,
 288         POWER_SUPPLY_PROP_CYCLE_COUNT,
 289         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 290         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 291         POWER_SUPPLY_PROP_POWER_NOW,
 292         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 293         POWER_SUPPLY_PROP_ENERGY_FULL,
 294         POWER_SUPPLY_PROP_ENERGY_NOW,
 295         POWER_SUPPLY_PROP_MODEL_NAME,
 296         POWER_SUPPLY_PROP_MANUFACTURER,
 297         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 298 };
 299
 300 #ifdef CONFIG_ACPI_PROCFS_POWER
 301 inline char *acpi_battery_units(struct acpi_battery *battery)
 302 {
 303         return (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) ?
 304                 "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         /* For buggy DSDTs that report negative 16-bit values for either
 465          * charging or discharging current and/or report 0 as 65536
 466          * due to bad math.
 467          */
 468         if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
 469                 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
 470                 (s16)(battery->rate_now) < 0) {
 471                 battery->rate_now = abs((s16)battery->rate_now);
 472                 printk_once(KERN_WARNING FW_BUG "battery: (dis)charge rate"
 473                         " invalid.\n");
 474         }
 475
 476         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
 477             && battery->capacity_now >= 0 && battery->capacity_now <= 100)
 478                 battery->capacity_now = (battery->capacity_now *
 479                                 battery->full_charge_capacity) / 100;
 480         return result;
 481 }
 482
 483 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 484 {
 485         acpi_status status = 0;
 486         union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
 487         struct acpi_object_list arg_list = { 1, &arg0 };
 488
 489         if (!acpi_battery_present(battery) ||
 490             !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
 491                 return -ENODEV;
 492
 493         arg0.integer.value = battery->alarm;
 494
 495         mutex_lock(&battery->lock);
 496         status = acpi_evaluate_object(battery->device->handle, "_BTP",
 497                                  &arg_list, NULL);
 498         mutex_unlock(&battery->lock);
 499
 500         if (ACPI_FAILURE(status))
 501                 return -ENODEV;
 502
 503         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
 504         return 0;
 505 }
 506
 507 static int acpi_battery_init_alarm(struct acpi_battery *battery)
 508 {
 509         acpi_status status = AE_OK;
 510         acpi_handle handle = NULL;
 511
 512         /* See if alarms are supported, and if so, set default */
 513         status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
 514         if (ACPI_FAILURE(status)) {
 515                 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
 516                 return 0;
 517         }
 518         set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
 519         if (!battery->alarm)
 520                 battery->alarm = battery->design_capacity_warning;
 521         return acpi_battery_set_alarm(battery);
 522 }
 523
 524 static ssize_t acpi_battery_alarm_show(struct device *dev,
 525                                         struct device_attribute *attr,
 526                                         char *buf)
 527 {
 528         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 529         return sprintf(buf, "%d\n", battery->alarm * 1000);
 530 }
 531
 532 static ssize_t acpi_battery_alarm_store(struct device *dev,
 533                                         struct device_attribute *attr,
 534                                         const char *buf, size_t count)
 535 {
 536         unsigned long x;
 537         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 538         if (sscanf(buf, "%ld\n", &x) == 1)
 539                 battery->alarm = x/1000;
 540         if (acpi_battery_present(battery))
 541                 acpi_battery_set_alarm(battery);
 542         return count;
 543 }
 544
 545 static struct device_attribute alarm_attr = {
 546         .attr = {.name = "alarm", .mode = 0644},
 547         .show = acpi_battery_alarm_show,
 548         .store = acpi_battery_alarm_store,
 549 };
 550
 551 static int sysfs_add_battery(struct acpi_battery *battery)
 552 {
 553         int result;
 554
 555         if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
 556                 battery->bat.properties = charge_battery_props;
 557                 battery->bat.num_properties =
 558                         ARRAY_SIZE(charge_battery_props);
 559         } else {
 560                 battery->bat.properties = energy_battery_props;
 561                 battery->bat.num_properties =
 562                         ARRAY_SIZE(energy_battery_props);
 563         }
 564
 565         battery->bat.name = acpi_device_bid(battery->device);
 566         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 567         battery->bat.get_property = acpi_battery_get_property;
 568
 569         result = power_supply_register(&battery->device->dev, &battery->bat);
 570         if (result)
 571                 return result;
 572         return device_create_file(battery->bat.dev, &alarm_attr);
 573 }
 574
 575 static void sysfs_remove_battery(struct acpi_battery *battery)
 576 {
 577         mutex_lock(&battery->sysfs_lock);
 578         if (!battery->bat.dev) {
 579                 mutex_unlock(&battery->sysfs_lock);
 580                 return;
 581         }
 582
 583         device_remove_file(battery->bat.dev, &alarm_attr);
 584         power_supply_unregister(&battery->bat);
 585         battery->bat.dev = NULL;
 586         mutex_unlock(&battery->sysfs_lock);
 587 }
 588
 589 /*
 590  * According to the ACPI spec, some kinds of primary batteries can
 591  * report percentage battery remaining capacity directly to OS.
 592  * In this case, it reports the Last Full Charged Capacity == 100
 593  * and BatteryPresentRate == 0xFFFFFFFF.
 594  *
 595  * Now we found some battery reports percentage remaining capacity
 596  * even if it's rechargeable.
 597  * https://bugzilla.kernel.org/show_bug.cgi?id=15979
 598  *
 599  * Handle this correctly so that they won't break userspace.
 600  */
 601 static void acpi_battery_quirks(struct acpi_battery *battery)
 602 {
 603         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
 604                 return ;
 605
 606         if (battery->full_charge_capacity == 100 &&
 607             battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
 608             battery->capacity_now >=0 && battery->capacity_now <= 100) {
 609                 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
 610                 battery->full_charge_capacity = battery->design_capacity;
 611                 battery->capacity_now = (battery->capacity_now *
 612                                 battery->full_charge_capacity) / 100;
 613         }
 614 }
 615
 616 static int acpi_battery_update(struct acpi_battery *battery)
 617 {
 618         int result, old_present = acpi_battery_present(battery);
 619         result = acpi_battery_get_status(battery);
 620         if (result)
 621                 return result;
 622         if (!acpi_battery_present(battery)) {
 623                 sysfs_remove_battery(battery);
 624                 battery->update_time = 0;
 625                 return 0;
 626         }
 627         if (!battery->update_time ||
 628             old_present != acpi_battery_present(battery)) {
 629                 result = acpi_battery_get_info(battery);
 630                 if (result)
 631                         return result;
 632                 acpi_battery_init_alarm(battery);
 633         }
 634         if (!battery->bat.dev) {
 635                 result = sysfs_add_battery(battery);
 636                 if (result)
 637                         return result;
 638         }
 639         result = acpi_battery_get_state(battery);
 640         acpi_battery_quirks(battery);
 641         return result;
 642 }
 643
 644 static void acpi_battery_refresh(struct acpi_battery *battery)
 645 {
 646         if (!battery->bat.dev)
 647                 return;
 648
 649         acpi_battery_get_info(battery);
 650         /* The battery may have 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 const struct battery_file {
 875         struct file_operations ops;
 876         umode_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_HIBERNATION:
 960         case PM_POST_SUSPEND:
 961                 if (battery->bat.dev) {
 962                         sysfs_remove_battery(battery);
 963                         sysfs_add_battery(battery);
 964                 }
 965                 break;
 966         }
 967
 968         return 0;
 969 }
 970
 971 static int acpi_battery_add(struct acpi_device *device)
 972 {
 973         int result = 0;
 974         struct acpi_battery *battery = NULL;
 975         acpi_handle handle;
 976         if (!device)
 977                 return -EINVAL;
 978         battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
 979         if (!battery)
 980                 return -ENOMEM;
 981         battery->device = device;
 982         strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
 983         strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
 984         device->driver_data = battery;
 985         mutex_init(&battery->lock);
 986         mutex_init(&battery->sysfs_lock);
 987         if (ACPI_SUCCESS(acpi_get_handle(battery->device->handle,
 988                         "_BIX", &handle)))
 989                 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
 990         result = acpi_battery_update(battery);
 991         if (result)
 992                 goto fail;
 993 #ifdef CONFIG_ACPI_PROCFS_POWER
 994         result = acpi_battery_add_fs(device);
 995 #endif
 996         if (result) {
 997 #ifdef CONFIG_ACPI_PROCFS_POWER
 998                 acpi_battery_remove_fs(device);
 999 #endif
1000                 goto fail;
1001         }
1002
1003         printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
1004                 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
1005                 device->status.battery_present ? "present" : "absent");
1006
1007         battery->pm_nb.notifier_call = battery_notify;
1008         register_pm_notifier(&battery->pm_nb);
1009
1010         return result;
1011
1012 fail:
1013         sysfs_remove_battery(battery);
1014         mutex_destroy(&battery->lock);
1015         mutex_destroy(&battery->sysfs_lock);
1016         kfree(battery);
1017         return result;
1018 }
1019
1020 static int acpi_battery_remove(struct acpi_device *device, int type)
1021 {
1022         struct acpi_battery *battery = NULL;
1023
1024         if (!device || !acpi_driver_data(device))
1025                 return -EINVAL;
1026         battery = acpi_driver_data(device);
1027         unregister_pm_notifier(&battery->pm_nb);
1028 #ifdef CONFIG_ACPI_PROCFS_POWER
1029         acpi_battery_remove_fs(device);
1030 #endif
1031         sysfs_remove_battery(battery);
1032         mutex_destroy(&battery->lock);
1033         mutex_destroy(&battery->sysfs_lock);
1034         kfree(battery);
1035         return 0;
1036 }
1037
1038 /* this is needed to learn about changes made in suspended state */
1039 static int acpi_battery_resume(struct acpi_device *device)
1040 {
1041         struct acpi_battery *battery;
1042         if (!device)
1043                 return -EINVAL;
1044         battery = acpi_driver_data(device);
1045         battery->update_time = 0;
1046         acpi_battery_update(battery);
1047         return 0;
1048 }
1049
1050 static struct acpi_driver acpi_battery_driver = {
1051         .name = "battery",
1052         .class = ACPI_BATTERY_CLASS,
1053         .ids = battery_device_ids,
1054         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1055         .ops = {
1056                 .add = acpi_battery_add,
1057                 .resume = acpi_battery_resume,
1058                 .remove = acpi_battery_remove,
1059                 .notify = acpi_battery_notify,
1060                 },
1061 };
1062
1063 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1064 {
1065         if (acpi_disabled)
1066                 return;
1067 #ifdef CONFIG_ACPI_PROCFS_POWER
1068         acpi_battery_dir = acpi_lock_battery_dir();
1069         if (!acpi_battery_dir)
1070                 return;
1071 #endif
1072         if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
1073 #ifdef CONFIG_ACPI_PROCFS_POWER
1074                 acpi_unlock_battery_dir(acpi_battery_dir);
1075 #endif
1076                 return;
1077         }
1078         return;
1079 }
1080
1081 static int __init acpi_battery_init(void)
1082 {
1083         async_schedule(acpi_battery_init_async, NULL);
1084         return 0;
1085 }
1086
1087 static void __exit acpi_battery_exit(void)
1088 {
1089         acpi_bus_unregister_driver(&acpi_battery_driver);
1090 #ifdef CONFIG_ACPI_PROCFS_POWER
1091         acpi_unlock_battery_dir(acpi_battery_dir);
1092 #endif
1093 }
1094
1095 module_init(acpi_battery_init);
1096 module_exit(acpi_battery_exit);