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