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_CAPACITY:
 254                 if (battery->capacity_now && battery->full_charge_capacity)
 255                         val->intval = battery->capacity_now * 100/
 256                                         battery->full_charge_capacity;
 257                 else
 258                         val->intval = 0;
 259                 break;
 260         case POWER_SUPPLY_PROP_MODEL_NAME:
 261                 val->strval = battery->model_number;
 262                 break;
 263         case POWER_SUPPLY_PROP_MANUFACTURER:
 264                 val->strval = battery->oem_info;
 265                 break;
 266         case POWER_SUPPLY_PROP_SERIAL_NUMBER:
 267                 val->strval = battery->serial_number;
 268                 break;
 269         default:
 270                 ret = -EINVAL;
 271         }
 272         return ret;
 273 }
 274
 275 static enum power_supply_property charge_battery_props[] = {
 276         POWER_SUPPLY_PROP_STATUS,
 277         POWER_SUPPLY_PROP_PRESENT,
 278         POWER_SUPPLY_PROP_TECHNOLOGY,
 279         POWER_SUPPLY_PROP_CYCLE_COUNT,
 280         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 281         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 282         POWER_SUPPLY_PROP_CURRENT_NOW,
 283         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 284         POWER_SUPPLY_PROP_CHARGE_FULL,
 285         POWER_SUPPLY_PROP_CHARGE_NOW,
 286         POWER_SUPPLY_PROP_CAPACITY,
 287         POWER_SUPPLY_PROP_MODEL_NAME,
 288         POWER_SUPPLY_PROP_MANUFACTURER,
 289         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 290 };
 291
 292 static enum power_supply_property energy_battery_props[] = {
 293         POWER_SUPPLY_PROP_STATUS,
 294         POWER_SUPPLY_PROP_PRESENT,
 295         POWER_SUPPLY_PROP_TECHNOLOGY,
 296         POWER_SUPPLY_PROP_CYCLE_COUNT,
 297         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 298         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 299         POWER_SUPPLY_PROP_POWER_NOW,
 300         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 301         POWER_SUPPLY_PROP_ENERGY_FULL,
 302         POWER_SUPPLY_PROP_ENERGY_NOW,
 303         POWER_SUPPLY_PROP_CAPACITY,
 304         POWER_SUPPLY_PROP_MODEL_NAME,
 305         POWER_SUPPLY_PROP_MANUFACTURER,
 306         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 307 };
 308
 309 #ifdef CONFIG_ACPI_PROCFS_POWER
 310 inline char *acpi_battery_units(struct acpi_battery *battery)
 311 {
 312         return (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) ?
 313                 "mA" : "mW";
 314 }
 315 #endif
 316
 317 /* --------------------------------------------------------------------------
 318                                Battery Management
 319    -------------------------------------------------------------------------- */
 320 struct acpi_offsets {
 321         size_t offset;          /* offset inside struct acpi_sbs_battery */
 322         u8 mode;                /* int or string? */
 323 };
 324
 325 static struct acpi_offsets state_offsets[] = {
 326         {offsetof(struct acpi_battery, state), 0},
 327         {offsetof(struct acpi_battery, rate_now), 0},
 328         {offsetof(struct acpi_battery, capacity_now), 0},
 329         {offsetof(struct acpi_battery, voltage_now), 0},
 330 };
 331
 332 static struct acpi_offsets info_offsets[] = {
 333         {offsetof(struct acpi_battery, power_unit), 0},
 334         {offsetof(struct acpi_battery, design_capacity), 0},
 335         {offsetof(struct acpi_battery, full_charge_capacity), 0},
 336         {offsetof(struct acpi_battery, technology), 0},
 337         {offsetof(struct acpi_battery, design_voltage), 0},
 338         {offsetof(struct acpi_battery, design_capacity_warning), 0},
 339         {offsetof(struct acpi_battery, design_capacity_low), 0},
 340         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
 341         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
 342         {offsetof(struct acpi_battery, model_number), 1},
 343         {offsetof(struct acpi_battery, serial_number), 1},
 344         {offsetof(struct acpi_battery, type), 1},
 345         {offsetof(struct acpi_battery, oem_info), 1},
 346 };
 347
 348 static struct acpi_offsets extended_info_offsets[] = {
 349         {offsetof(struct acpi_battery, power_unit), 0},
 350         {offsetof(struct acpi_battery, design_capacity), 0},
 351         {offsetof(struct acpi_battery, full_charge_capacity), 0},
 352         {offsetof(struct acpi_battery, technology), 0},
 353         {offsetof(struct acpi_battery, design_voltage), 0},
 354         {offsetof(struct acpi_battery, design_capacity_warning), 0},
 355         {offsetof(struct acpi_battery, design_capacity_low), 0},
 356         {offsetof(struct acpi_battery, cycle_count), 0},
 357         {offsetof(struct acpi_battery, measurement_accuracy), 0},
 358         {offsetof(struct acpi_battery, max_sampling_time), 0},
 359         {offsetof(struct acpi_battery, min_sampling_time), 0},
 360         {offsetof(struct acpi_battery, max_averaging_interval), 0},
 361         {offsetof(struct acpi_battery, min_averaging_interval), 0},
 362         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
 363         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
 364         {offsetof(struct acpi_battery, model_number), 1},
 365         {offsetof(struct acpi_battery, serial_number), 1},
 366         {offsetof(struct acpi_battery, type), 1},
 367         {offsetof(struct acpi_battery, oem_info), 1},
 368 };
 369
 370 static int extract_package(struct acpi_battery *battery,
 371                            union acpi_object *package,
 372                            struct acpi_offsets *offsets, int num)
 373 {
 374         int i;
 375         union acpi_object *element;
 376         if (package->type != ACPI_TYPE_PACKAGE)
 377                 return -EFAULT;
 378         for (i = 0; i < num; ++i) {
 379                 if (package->package.count <= i)
 380                         return -EFAULT;
 381                 element = &package->package.elements[i];
 382                 if (offsets[i].mode) {
 383                         u8 *ptr = (u8 *)battery + offsets[i].offset;
 384                         if (element->type == ACPI_TYPE_STRING ||
 385                             element->type == ACPI_TYPE_BUFFER)
 386                                 strncpy(ptr, element->string.pointer, 32);
 387                         else if (element->type == ACPI_TYPE_INTEGER) {
 388                                 strncpy(ptr, (u8 *)&element->integer.value,
 389                                         sizeof(u64));
 390                                 ptr[sizeof(u64)] = 0;
 391                         } else
 392                                 *ptr = 0; /* don't have value */
 393                 } else {
 394                         int *x = (int *)((u8 *)battery + offsets[i].offset);
 395                         *x = (element->type == ACPI_TYPE_INTEGER) ?
 396                                 element->integer.value : -1;
 397                 }
 398         }
 399         return 0;
 400 }
 401
 402 static int acpi_battery_get_status(struct acpi_battery *battery)
 403 {
 404         if (acpi_bus_get_status(battery->device)) {
 405                 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
 406                 return -ENODEV;
 407         }
 408         return 0;
 409 }
 410
 411 static int acpi_battery_get_info(struct acpi_battery *battery)
 412 {
 413         int result = -EFAULT;
 414         acpi_status status = 0;
 415         char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags)?
 416                         "_BIX" : "_BIF";
 417
 418         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 419
 420         if (!acpi_battery_present(battery))
 421                 return 0;
 422         mutex_lock(&battery->lock);
 423         status = acpi_evaluate_object(battery->device->handle, name,
 424                                                 NULL, &buffer);
 425         mutex_unlock(&battery->lock);
 426
 427         if (ACPI_FAILURE(status)) {
 428                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name));
 429                 return -ENODEV;
 430         }
 431         if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags))
 432                 result = extract_package(battery, buffer.pointer,
 433                                 extended_info_offsets,
 434                                 ARRAY_SIZE(extended_info_offsets));
 435         else
 436                 result = extract_package(battery, buffer.pointer,
 437                                 info_offsets, ARRAY_SIZE(info_offsets));
 438         kfree(buffer.pointer);
 439         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
 440                 battery->full_charge_capacity = battery->design_capacity;
 441         return result;
 442 }
 443
 444 static int acpi_battery_get_state(struct acpi_battery *battery)
 445 {
 446         int result = 0;
 447         acpi_status status = 0;
 448         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 449
 450         if (!acpi_battery_present(battery))
 451                 return 0;
 452
 453         if (battery->update_time &&
 454             time_before(jiffies, battery->update_time +
 455                         msecs_to_jiffies(cache_time)))
 456                 return 0;
 457
 458         mutex_lock(&battery->lock);
 459         status = acpi_evaluate_object(battery->device->handle, "_BST",
 460                                       NULL, &buffer);
 461         mutex_unlock(&battery->lock);
 462
 463         if (ACPI_FAILURE(status)) {
 464                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
 465                 return -ENODEV;
 466         }
 467
 468         result = extract_package(battery, buffer.pointer,
 469                                  state_offsets, ARRAY_SIZE(state_offsets));
 470         battery->update_time = jiffies;
 471         kfree(buffer.pointer);
 472
 473         /* For buggy DSDTs that report negative 16-bit values for either
 474          * charging or discharging current and/or report 0 as 65536
 475          * due to bad math.
 476          */
 477         if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
 478                 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
 479                 (s16)(battery->rate_now) < 0) {
 480                 battery->rate_now = abs((s16)battery->rate_now);
 481                 printk_once(KERN_WARNING FW_BUG "battery: (dis)charge rate"
 482                         " invalid.\n");
 483         }
 484
 485         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
 486             && battery->capacity_now >= 0 && battery->capacity_now <= 100)
 487                 battery->capacity_now = (battery->capacity_now *
 488                                 battery->full_charge_capacity) / 100;
 489         return result;
 490 }
 491
 492 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 493 {
 494         acpi_status status = 0;
 495         union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
 496         struct acpi_object_list arg_list = { 1, &arg0 };
 497
 498         if (!acpi_battery_present(battery) ||
 499             !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
 500                 return -ENODEV;
 501
 502         arg0.integer.value = battery->alarm;
 503
 504         mutex_lock(&battery->lock);
 505         status = acpi_evaluate_object(battery->device->handle, "_BTP",
 506                                  &arg_list, NULL);
 507         mutex_unlock(&battery->lock);
 508
 509         if (ACPI_FAILURE(status))
 510                 return -ENODEV;
 511
 512         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
 513         return 0;
 514 }
 515
 516 static int acpi_battery_init_alarm(struct acpi_battery *battery)
 517 {
 518         acpi_status status = AE_OK;
 519         acpi_handle handle = NULL;
 520
 521         /* See if alarms are supported, and if so, set default */
 522         status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
 523         if (ACPI_FAILURE(status)) {
 524                 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
 525                 return 0;
 526         }
 527         set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
 528         if (!battery->alarm)
 529                 battery->alarm = battery->design_capacity_warning;
 530         return acpi_battery_set_alarm(battery);
 531 }
 532
 533 static ssize_t acpi_battery_alarm_show(struct device *dev,
 534                                         struct device_attribute *attr,
 535                                         char *buf)
 536 {
 537         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 538         return sprintf(buf, "%d\n", battery->alarm * 1000);
 539 }
 540
 541 static ssize_t acpi_battery_alarm_store(struct device *dev,
 542                                         struct device_attribute *attr,
 543                                         const char *buf, size_t count)
 544 {
 545         unsigned long x;
 546         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 547         if (sscanf(buf, "%ld\n", &x) == 1)
 548                 battery->alarm = x/1000;
 549         if (acpi_battery_present(battery))
 550                 acpi_battery_set_alarm(battery);
 551         return count;
 552 }
 553
 554 static struct device_attribute alarm_attr = {
 555         .attr = {.name = "alarm", .mode = 0644},
 556         .show = acpi_battery_alarm_show,
 557         .store = acpi_battery_alarm_store,
 558 };
 559
 560 static int sysfs_add_battery(struct acpi_battery *battery)
 561 {
 562         int result;
 563
 564         if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
 565                 battery->bat.properties = charge_battery_props;
 566                 battery->bat.num_properties =
 567                         ARRAY_SIZE(charge_battery_props);
 568         } else {
 569                 battery->bat.properties = energy_battery_props;
 570                 battery->bat.num_properties =
 571                         ARRAY_SIZE(energy_battery_props);
 572         }
 573
 574         battery->bat.name = acpi_device_bid(battery->device);
 575         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 576         battery->bat.get_property = acpi_battery_get_property;
 577
 578         result = power_supply_register(&battery->device->dev, &battery->bat);
 579         if (result)
 580                 return result;
 581         return device_create_file(battery->bat.dev, &alarm_attr);
 582 }
 583
 584 static void sysfs_remove_battery(struct acpi_battery *battery)
 585 {
 586         mutex_lock(&battery->sysfs_lock);
 587         if (!battery->bat.dev) {
 588                 mutex_unlock(&battery->sysfs_lock);
 589                 return;
 590         }
 591
 592         device_remove_file(battery->bat.dev, &alarm_attr);
 593         power_supply_unregister(&battery->bat);
 594         battery->bat.dev = NULL;
 595         mutex_unlock(&battery->sysfs_lock);
 596 }
 597
 598 /*
 599  * According to the ACPI spec, some kinds of primary batteries can
 600  * report percentage battery remaining capacity directly to OS.
 601  * In this case, it reports the Last Full Charged Capacity == 100
 602  * and BatteryPresentRate == 0xFFFFFFFF.
 603  *
 604  * Now we found some battery reports percentage remaining capacity
 605  * even if it's rechargeable.
 606  * https://bugzilla.kernel.org/show_bug.cgi?id=15979
 607  *
 608  * Handle this correctly so that they won't break userspace.
 609  */
 610 static void acpi_battery_quirks(struct acpi_battery *battery)
 611 {
 612         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
 613                 return ;
 614
 615         if (battery->full_charge_capacity == 100 &&
 616             battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
 617             battery->capacity_now >=0 && battery->capacity_now <= 100) {
 618                 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
 619                 battery->full_charge_capacity = battery->design_capacity;
 620                 battery->capacity_now = (battery->capacity_now *
 621                                 battery->full_charge_capacity) / 100;
 622         }
 623 }
 624
 625 static int acpi_battery_update(struct acpi_battery *battery)
 626 {
 627         int result, old_present = acpi_battery_present(battery);
 628         result = acpi_battery_get_status(battery);
 629         if (result)
 630                 return result;
 631         if (!acpi_battery_present(battery)) {
 632                 sysfs_remove_battery(battery);
 633                 battery->update_time = 0;
 634                 return 0;
 635         }
 636         if (!battery->update_time ||
 637             old_present != acpi_battery_present(battery)) {
 638                 result = acpi_battery_get_info(battery);
 639                 if (result)
 640                         return result;
 641                 acpi_battery_init_alarm(battery);
 642         }
 643         if (!battery->bat.dev) {
 644                 result = sysfs_add_battery(battery);
 645                 if (result)
 646                         return result;
 647         }
 648         result = acpi_battery_get_state(battery);
 649         acpi_battery_quirks(battery);
 650         return result;
 651 }
 652
 653 static void acpi_battery_refresh(struct acpi_battery *battery)
 654 {
 655         int power_unit;
 656
 657         if (!battery->bat.dev)
 658                 return;
 659
 660         power_unit = battery->power_unit;
 661
 662         acpi_battery_get_info(battery);
 663
 664         if (power_unit == battery->power_unit)
 665                 return;
 666
 667         /* The battery has changed its reporting units. */
 668         sysfs_remove_battery(battery);
 669         sysfs_add_battery(battery);
 670 }
 671
 672 /* --------------------------------------------------------------------------
 673                               FS Interface (/proc)
 674    -------------------------------------------------------------------------- */
 675
 676 #ifdef CONFIG_ACPI_PROCFS_POWER
 677 static struct proc_dir_entry *acpi_battery_dir;
 678
 679 static int acpi_battery_print_info(struct seq_file *seq, int result)
 680 {
 681         struct acpi_battery *battery = seq->private;
 682
 683         if (result)
 684                 goto end;
 685
 686         seq_printf(seq, "present:                 %s\n",
 687                    acpi_battery_present(battery)?"yes":"no");
 688         if (!acpi_battery_present(battery))
 689                 goto end;
 690         if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 691                 seq_printf(seq, "design capacity:         unknown\n");
 692         else
 693                 seq_printf(seq, "design capacity:         %d %sh\n",
 694                            battery->design_capacity,
 695                            acpi_battery_units(battery));
 696
 697         if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 698                 seq_printf(seq, "last full capacity:      unknown\n");
 699         else
 700                 seq_printf(seq, "last full capacity:      %d %sh\n",
 701                            battery->full_charge_capacity,
 702                            acpi_battery_units(battery));
 703
 704         seq_printf(seq, "battery technology:      %srechargeable\n",
 705                    (!battery->technology)?"non-":"");
 706
 707         if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 708                 seq_printf(seq, "design voltage:          unknown\n");
 709         else
 710                 seq_printf(seq, "design voltage:          %d mV\n",
 711                            battery->design_voltage);
 712         seq_printf(seq, "design capacity warning: %d %sh\n",
 713                    battery->design_capacity_warning,
 714                    acpi_battery_units(battery));
 715         seq_printf(seq, "design capacity low:     %d %sh\n",
 716                    battery->design_capacity_low,
 717                    acpi_battery_units(battery));
 718         seq_printf(seq, "cycle count:             %i\n", battery->cycle_count);
 719         seq_printf(seq, "capacity granularity 1:  %d %sh\n",
 720                    battery->capacity_granularity_1,
 721                    acpi_battery_units(battery));
 722         seq_printf(seq, "capacity granularity 2:  %d %sh\n",
 723                    battery->capacity_granularity_2,
 724                    acpi_battery_units(battery));
 725         seq_printf(seq, "model number:            %s\n", battery->model_number);
 726         seq_printf(seq, "serial number:           %s\n", battery->serial_number);
 727         seq_printf(seq, "battery type:            %s\n", battery->type);
 728         seq_printf(seq, "OEM info:                %s\n", battery->oem_info);
 729       end:
 730         if (result)
 731                 seq_printf(seq, "ERROR: Unable to read battery info\n");
 732         return result;
 733 }
 734
 735 static int acpi_battery_print_state(struct seq_file *seq, int result)
 736 {
 737         struct acpi_battery *battery = seq->private;
 738
 739         if (result)
 740                 goto end;
 741
 742         seq_printf(seq, "present:                 %s\n",
 743                    acpi_battery_present(battery)?"yes":"no");
 744         if (!acpi_battery_present(battery))
 745                 goto end;
 746
 747         seq_printf(seq, "capacity state:          %s\n",
 748                         (battery->state & 0x04)?"critical":"ok");
 749         if ((battery->state & 0x01) && (battery->state & 0x02))
 750                 seq_printf(seq,
 751                            "charging state:          charging/discharging\n");
 752         else if (battery->state & 0x01)
 753                 seq_printf(seq, "charging state:          discharging\n");
 754         else if (battery->state & 0x02)
 755                 seq_printf(seq, "charging state:          charging\n");
 756         else
 757                 seq_printf(seq, "charging state:          charged\n");
 758
 759         if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
 760                 seq_printf(seq, "present rate:            unknown\n");
 761         else
 762                 seq_printf(seq, "present rate:            %d %s\n",
 763                            battery->rate_now, acpi_battery_units(battery));
 764
 765         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
 766                 seq_printf(seq, "remaining capacity:      unknown\n");
 767         else
 768                 seq_printf(seq, "remaining capacity:      %d %sh\n",
 769                            battery->capacity_now, acpi_battery_units(battery));
 770         if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
 771                 seq_printf(seq, "present voltage:         unknown\n");
 772         else
 773                 seq_printf(seq, "present voltage:         %d mV\n",
 774                            battery->voltage_now);
 775       end:
 776         if (result)
 777                 seq_printf(seq, "ERROR: Unable to read battery state\n");
 778
 779         return result;
 780 }
 781
 782 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
 783 {
 784         struct acpi_battery *battery = seq->private;
 785
 786         if (result)
 787                 goto end;
 788
 789         if (!acpi_battery_present(battery)) {
 790                 seq_printf(seq, "present:                 no\n");
 791                 goto end;
 792         }
 793         seq_printf(seq, "alarm:                   ");
 794         if (!battery->alarm)
 795                 seq_printf(seq, "unsupported\n");
 796         else
 797                 seq_printf(seq, "%u %sh\n", battery->alarm,
 798                                 acpi_battery_units(battery));
 799       end:
 800         if (result)
 801                 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
 802         return result;
 803 }
 804
 805 static ssize_t acpi_battery_write_alarm(struct file *file,
 806                                         const char __user * buffer,
 807                                         size_t count, loff_t * ppos)
 808 {
 809         int result = 0;
 810         char alarm_string[12] = { '\0' };
 811         struct seq_file *m = file->private_data;
 812         struct acpi_battery *battery = m->private;
 813
 814         if (!battery || (count > sizeof(alarm_string) - 1))
 815                 return -EINVAL;
 816         if (!acpi_battery_present(battery)) {
 817                 result = -ENODEV;
 818                 goto end;
 819         }
 820         if (copy_from_user(alarm_string, buffer, count)) {
 821                 result = -EFAULT;
 822                 goto end;
 823         }
 824         alarm_string[count] = '\0';
 825         battery->alarm = simple_strtol(alarm_string, NULL, 0);
 826         result = acpi_battery_set_alarm(battery);
 827       end:
 828         if (!result)
 829                 return count;
 830         return result;
 831 }
 832
 833 typedef int(*print_func)(struct seq_file *seq, int result);
 834
 835 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
 836         acpi_battery_print_info,
 837         acpi_battery_print_state,
 838         acpi_battery_print_alarm,
 839 };
 840
 841 static int acpi_battery_read(int fid, struct seq_file *seq)
 842 {
 843         struct acpi_battery *battery = seq->private;
 844         int result = acpi_battery_update(battery);
 845         return acpi_print_funcs[fid](seq, result);
 846 }
 847
 848 #define DECLARE_FILE_FUNCTIONS(_name) \
 849 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
 850 { \
 851         return acpi_battery_read(_name##_tag, seq); \
 852 } \
 853 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
 854 { \
 855         return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
 856 }
 857
 858 DECLARE_FILE_FUNCTIONS(info);
 859 DECLARE_FILE_FUNCTIONS(state);
 860 DECLARE_FILE_FUNCTIONS(alarm);
 861
 862 #undef DECLARE_FILE_FUNCTIONS
 863
 864 #define FILE_DESCRIPTION_RO(_name) \
 865         { \
 866         .name = __stringify(_name), \
 867         .mode = S_IRUGO, \
 868         .ops = { \
 869                 .open = acpi_battery_##_name##_open_fs, \
 870                 .read = seq_read, \
 871                 .llseek = seq_lseek, \
 872                 .release = single_release, \
 873                 .owner = THIS_MODULE, \
 874                 }, \
 875         }
 876
 877 #define FILE_DESCRIPTION_RW(_name) \
 878         { \
 879         .name = __stringify(_name), \
 880         .mode = S_IFREG | S_IRUGO | S_IWUSR, \
 881         .ops = { \
 882                 .open = acpi_battery_##_name##_open_fs, \
 883                 .read = seq_read, \
 884                 .llseek = seq_lseek, \
 885                 .write = acpi_battery_write_##_name, \
 886                 .release = single_release, \
 887                 .owner = THIS_MODULE, \
 888                 }, \
 889         }
 890
 891 static const struct battery_file {
 892         struct file_operations ops;
 893         umode_t mode;
 894         const char *name;
 895 } acpi_battery_file[] = {
 896         FILE_DESCRIPTION_RO(info),
 897         FILE_DESCRIPTION_RO(state),
 898         FILE_DESCRIPTION_RW(alarm),
 899 };
 900
 901 #undef FILE_DESCRIPTION_RO
 902 #undef FILE_DESCRIPTION_RW
 903
 904 static int acpi_battery_add_fs(struct acpi_device *device)
 905 {
 906         struct proc_dir_entry *entry = NULL;
 907         int i;
 908
 909         printk(KERN_WARNING PREFIX "Deprecated procfs I/F for battery is loaded,"
 910                         " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
 911         if (!acpi_device_dir(device)) {
 912                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 913                                                      acpi_battery_dir);
 914                 if (!acpi_device_dir(device))
 915                         return -ENODEV;
 916         }
 917
 918         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
 919                 entry = proc_create_data(acpi_battery_file[i].name,
 920                                          acpi_battery_file[i].mode,
 921                                          acpi_device_dir(device),
 922                                          &acpi_battery_file[i].ops,
 923                                          acpi_driver_data(device));
 924                 if (!entry)
 925                         return -ENODEV;
 926         }
 927         return 0;
 928 }
 929
 930 static void acpi_battery_remove_fs(struct acpi_device *device)
 931 {
 932         int i;
 933         if (!acpi_device_dir(device))
 934                 return;
 935         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
 936                 remove_proc_entry(acpi_battery_file[i].name,
 937                                   acpi_device_dir(device));
 938
 939         remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
 940         acpi_device_dir(device) = NULL;
 941 }
 942
 943 #endif
 944
 945 /* --------------------------------------------------------------------------
 946                                  Driver Interface
 947    -------------------------------------------------------------------------- */
 948
 949 static void acpi_battery_notify(struct acpi_device *device, u32 event)
 950 {
 951         struct acpi_battery *battery = acpi_driver_data(device);
 952         struct device *old;
 953
 954         if (!battery)
 955                 return;
 956         old = battery->bat.dev;
 957         if (event == ACPI_BATTERY_NOTIFY_INFO)
 958                 acpi_battery_refresh(battery);
 959         acpi_battery_update(battery);
 960         acpi_bus_generate_proc_event(device, event,
 961                                      acpi_battery_present(battery));
 962         acpi_bus_generate_netlink_event(device->pnp.device_class,
 963                                         dev_name(&device->dev), event,
 964                                         acpi_battery_present(battery));
 965         /* acpi_battery_update could remove power_supply object */
 966         if (old && battery->bat.dev)
 967                 power_supply_changed(&battery->bat);
 968 }
 969
 970 static int battery_notify(struct notifier_block *nb,
 971                                unsigned long mode, void *_unused)
 972 {
 973         struct acpi_battery *battery = container_of(nb, struct acpi_battery,
 974                                                     pm_nb);
 975         switch (mode) {
 976         case PM_POST_HIBERNATION:
 977         case PM_POST_SUSPEND:
 978                 if (battery->bat.dev) {
 979                         sysfs_remove_battery(battery);
 980                         sysfs_add_battery(battery);
 981                 }
 982                 break;
 983         }
 984
 985         return 0;
 986 }
 987
 988 static int acpi_battery_add(struct acpi_device *device)
 989 {
 990         int result = 0;
 991         struct acpi_battery *battery = NULL;
 992         acpi_handle handle;
 993         if (!device)
 994                 return -EINVAL;
 995         battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
 996         if (!battery)
 997                 return -ENOMEM;
 998         battery->device = device;
 999         strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
1000         strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
1001         device->driver_data = battery;
1002         mutex_init(&battery->lock);
1003         mutex_init(&battery->sysfs_lock);
1004         if (ACPI_SUCCESS(acpi_get_handle(battery->device->handle,
1005                         "_BIX", &handle)))
1006                 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
1007         result = acpi_battery_update(battery);
1008         if (result)
1009                 goto fail;
1010 #ifdef CONFIG_ACPI_PROCFS_POWER
1011         result = acpi_battery_add_fs(device);
1012 #endif
1013         if (result) {
1014 #ifdef CONFIG_ACPI_PROCFS_POWER
1015                 acpi_battery_remove_fs(device);
1016 #endif
1017                 goto fail;
1018         }
1019
1020         printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
1021                 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
1022                 device->status.battery_present ? "present" : "absent");
1023
1024         battery->pm_nb.notifier_call = battery_notify;
1025         register_pm_notifier(&battery->pm_nb);
1026
1027         return result;
1028
1029 fail:
1030         sysfs_remove_battery(battery);
1031         mutex_destroy(&battery->lock);
1032         mutex_destroy(&battery->sysfs_lock);
1033         kfree(battery);
1034         return result;
1035 }
1036
1037 static int acpi_battery_remove(struct acpi_device *device, int type)
1038 {
1039         struct acpi_battery *battery = NULL;
1040
1041         if (!device || !acpi_driver_data(device))
1042                 return -EINVAL;
1043         battery = acpi_driver_data(device);
1044         unregister_pm_notifier(&battery->pm_nb);
1045 #ifdef CONFIG_ACPI_PROCFS_POWER
1046         acpi_battery_remove_fs(device);
1047 #endif
1048         sysfs_remove_battery(battery);
1049         mutex_destroy(&battery->lock);
1050         mutex_destroy(&battery->sysfs_lock);
1051         kfree(battery);
1052         return 0;
1053 }
1054
1055 #ifdef CONFIG_PM_SLEEP
1056 /* this is needed to learn about changes made in suspended state */
1057 static int acpi_battery_resume(struct device *dev)
1058 {
1059         struct acpi_battery *battery;
1060
1061         if (!dev)
1062                 return -EINVAL;
1063
1064         battery = acpi_driver_data(to_acpi_device(dev));
1065         if (!battery)
1066                 return -EINVAL;
1067
1068         battery->update_time = 0;
1069         acpi_battery_update(battery);
1070         return 0;
1071 }
1072 #endif
1073
1074 static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);
1075
1076 static struct acpi_driver acpi_battery_driver = {
1077         .name = "battery",
1078         .class = ACPI_BATTERY_CLASS,
1079         .ids = battery_device_ids,
1080         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1081         .ops = {
1082                 .add = acpi_battery_add,
1083                 .remove = acpi_battery_remove,
1084                 .notify = acpi_battery_notify,
1085                 },
1086         .drv.pm = &acpi_battery_pm,
1087 };
1088
1089 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1090 {
1091         if (acpi_disabled)
1092                 return;
1093 #ifdef CONFIG_ACPI_PROCFS_POWER
1094         acpi_battery_dir = acpi_lock_battery_dir();
1095         if (!acpi_battery_dir)
1096                 return;
1097 #endif
1098         if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
1099 #ifdef CONFIG_ACPI_PROCFS_POWER
1100                 acpi_unlock_battery_dir(acpi_battery_dir);
1101 #endif
1102                 return;
1103         }
1104         return;
1105 }
1106
1107 static int __init acpi_battery_init(void)
1108 {
1109         async_schedule(acpi_battery_init_async, NULL);
1110         return 0;
1111 }
1112
1113 static void __exit acpi_battery_exit(void)
1114 {
1115         acpi_bus_unregister_driver(&acpi_battery_driver);
1116 #ifdef CONFIG_ACPI_PROCFS_POWER
1117         acpi_unlock_battery_dir(acpi_battery_dir);
1118 #endif
1119 }
1120
1121 module_init(acpi_battery_init);
1122 module_exit(acpi_battery_exit);