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