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         int ret = 0;
 190         struct acpi_battery *battery = to_acpi_battery(psy);
 191
 192         if (acpi_battery_present(battery)) {
 193                 /* run battery update only if it is present */
 194                 acpi_battery_get_state(battery);
 195         } else if (psp != POWER_SUPPLY_PROP_PRESENT)
 196                 return -ENODEV;
 197         switch (psp) {
 198         case POWER_SUPPLY_PROP_STATUS:
 199                 if (battery->state & 0x01)
 200                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 201                 else if (battery->state & 0x02)
 202                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 203                 else if (acpi_battery_is_charged(battery))
 204                         val->intval = POWER_SUPPLY_STATUS_FULL;
 205                 else
 206                         val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 207                 break;
 208         case POWER_SUPPLY_PROP_PRESENT:
 209                 val->intval = acpi_battery_present(battery);
 210                 break;
 211         case POWER_SUPPLY_PROP_TECHNOLOGY:
 212                 val->intval = acpi_battery_technology(battery);
 213                 break;
 214         case POWER_SUPPLY_PROP_CYCLE_COUNT:
 215                 val->intval = battery->cycle_count;
 216                 break;
 217         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 218                 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 219                         ret = -ENODEV;
 220                 else
 221                         val->intval = battery->design_voltage * 1000;
 222                 break;
 223         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 224                 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
 225                         ret = -ENODEV;
 226                 else
 227                         val->intval = battery->voltage_now * 1000;
 228                 break;
 229         case POWER_SUPPLY_PROP_CURRENT_NOW:
 230         case POWER_SUPPLY_PROP_POWER_NOW:
 231                 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
 232                         ret = -ENODEV;
 233                 else
 234                         val->intval = battery->rate_now * 1000;
 235                 break;
 236         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 237         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 238                 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 239                         ret = -ENODEV;
 240                 else
 241                         val->intval = battery->design_capacity * 1000;
 242                 break;
 243         case POWER_SUPPLY_PROP_CHARGE_FULL:
 244         case POWER_SUPPLY_PROP_ENERGY_FULL:
 245                 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 246                         ret = -ENODEV;
 247                 else
 248                         val->intval = battery->full_charge_capacity * 1000;
 249                 break;
 250         case POWER_SUPPLY_PROP_CHARGE_NOW:
 251         case POWER_SUPPLY_PROP_ENERGY_NOW:
 252                 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
 253                         ret = -ENODEV;
 254                 else
 255                         val->intval = battery->capacity_now * 1000;
 256                 break;
 257         case POWER_SUPPLY_PROP_MODEL_NAME:
 258                 val->strval = battery->model_number;
 259                 break;
 260         case POWER_SUPPLY_PROP_MANUFACTURER:
 261                 val->strval = battery->oem_info;
 262                 break;
 263         case POWER_SUPPLY_PROP_SERIAL_NUMBER:
 264                 val->strval = battery->serial_number;
 265                 break;
 266         default:
 267                 ret = -EINVAL;
 268         }
 269         return ret;
 270 }
 271
 272 static enum power_supply_property charge_battery_props[] = {
 273         POWER_SUPPLY_PROP_STATUS,
 274         POWER_SUPPLY_PROP_PRESENT,
 275         POWER_SUPPLY_PROP_TECHNOLOGY,
 276         POWER_SUPPLY_PROP_CYCLE_COUNT,
 277         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 278         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 279         POWER_SUPPLY_PROP_CURRENT_NOW,
 280         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 281         POWER_SUPPLY_PROP_CHARGE_FULL,
 282         POWER_SUPPLY_PROP_CHARGE_NOW,
 283         POWER_SUPPLY_PROP_MODEL_NAME,
 284         POWER_SUPPLY_PROP_MANUFACTURER,
 285         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 286 };
 287
 288 static enum power_supply_property energy_battery_props[] = {
 289         POWER_SUPPLY_PROP_STATUS,
 290         POWER_SUPPLY_PROP_PRESENT,
 291         POWER_SUPPLY_PROP_TECHNOLOGY,
 292         POWER_SUPPLY_PROP_CYCLE_COUNT,
 293         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 294         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 295         POWER_SUPPLY_PROP_POWER_NOW,
 296         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 297         POWER_SUPPLY_PROP_ENERGY_FULL,
 298         POWER_SUPPLY_PROP_ENERGY_NOW,
 299         POWER_SUPPLY_PROP_MODEL_NAME,
 300         POWER_SUPPLY_PROP_MANUFACTURER,
 301         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 302 };
 303 #endif
 304
 305 #ifdef CONFIG_ACPI_PROCFS_POWER
 306 inline char *acpi_battery_units(struct acpi_battery *battery)
 307 {
 308         return (battery->power_unit)?"mA":"mW";
 309 }
 310 #endif
 311
 312 /* --------------------------------------------------------------------------
 313                                Battery Management
 314    -------------------------------------------------------------------------- */
 315 struct acpi_offsets {
 316         size_t offset;          /* offset inside struct acpi_sbs_battery */
 317         u8 mode;                /* int or string? */
 318 };
 319
 320 static struct acpi_offsets state_offsets[] = {
 321         {offsetof(struct acpi_battery, state), 0},
 322         {offsetof(struct acpi_battery, rate_now), 0},
 323         {offsetof(struct acpi_battery, capacity_now), 0},
 324         {offsetof(struct acpi_battery, voltage_now), 0},
 325 };
 326
 327 static struct acpi_offsets info_offsets[] = {
 328         {offsetof(struct acpi_battery, power_unit), 0},
 329         {offsetof(struct acpi_battery, design_capacity), 0},
 330         {offsetof(struct acpi_battery, full_charge_capacity), 0},
 331         {offsetof(struct acpi_battery, technology), 0},
 332         {offsetof(struct acpi_battery, design_voltage), 0},
 333         {offsetof(struct acpi_battery, design_capacity_warning), 0},
 334         {offsetof(struct acpi_battery, design_capacity_low), 0},
 335         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
 336         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
 337         {offsetof(struct acpi_battery, model_number), 1},
 338         {offsetof(struct acpi_battery, serial_number), 1},
 339         {offsetof(struct acpi_battery, type), 1},
 340         {offsetof(struct acpi_battery, oem_info), 1},
 341 };
 342
 343 static struct acpi_offsets extended_info_offsets[] = {
 344         {offsetof(struct acpi_battery, power_unit), 0},
 345         {offsetof(struct acpi_battery, design_capacity), 0},
 346         {offsetof(struct acpi_battery, full_charge_capacity), 0},
 347         {offsetof(struct acpi_battery, technology), 0},
 348         {offsetof(struct acpi_battery, design_voltage), 0},
 349         {offsetof(struct acpi_battery, design_capacity_warning), 0},
 350         {offsetof(struct acpi_battery, design_capacity_low), 0},
 351         {offsetof(struct acpi_battery, cycle_count), 0},
 352         {offsetof(struct acpi_battery, measurement_accuracy), 0},
 353         {offsetof(struct acpi_battery, max_sampling_time), 0},
 354         {offsetof(struct acpi_battery, min_sampling_time), 0},
 355         {offsetof(struct acpi_battery, max_averaging_interval), 0},
 356         {offsetof(struct acpi_battery, min_averaging_interval), 0},
 357         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
 358         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
 359         {offsetof(struct acpi_battery, model_number), 1},
 360         {offsetof(struct acpi_battery, serial_number), 1},
 361         {offsetof(struct acpi_battery, type), 1},
 362         {offsetof(struct acpi_battery, oem_info), 1},
 363 };
 364
 365 static int extract_package(struct acpi_battery *battery,
 366                            union acpi_object *package,
 367                            struct acpi_offsets *offsets, int num)
 368 {
 369         int i;
 370         union acpi_object *element;
 371         if (package->type != ACPI_TYPE_PACKAGE)
 372                 return -EFAULT;
 373         for (i = 0; i < num; ++i) {
 374                 if (package->package.count <= i)
 375                         return -EFAULT;
 376                 element = &package->package.elements[i];
 377                 if (offsets[i].mode) {
 378                         u8 *ptr = (u8 *)battery + offsets[i].offset;
 379                         if (element->type == ACPI_TYPE_STRING ||
 380                             element->type == ACPI_TYPE_BUFFER)
 381                                 strncpy(ptr, element->string.pointer, 32);
 382                         else if (element->type == ACPI_TYPE_INTEGER) {
 383                                 strncpy(ptr, (u8 *)&element->integer.value,
 384                                         sizeof(u64));
 385                                 ptr[sizeof(u64)] = 0;
 386                         } else
 387                                 *ptr = 0; /* don't have value */
 388                 } else {
 389                         int *x = (int *)((u8 *)battery + offsets[i].offset);
 390                         *x = (element->type == ACPI_TYPE_INTEGER) ?
 391                                 element->integer.value : -1;
 392                 }
 393         }
 394         return 0;
 395 }
 396
 397 static int acpi_battery_get_status(struct acpi_battery *battery)
 398 {
 399         if (acpi_bus_get_status(battery->device)) {
 400                 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
 401                 return -ENODEV;
 402         }
 403         return 0;
 404 }
 405
 406 static int acpi_battery_get_info(struct acpi_battery *battery)
 407 {
 408         int result = -EFAULT;
 409         acpi_status status = 0;
 410         char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags)?
 411                         "_BIX" : "_BIF";
 412
 413         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 414
 415         if (!acpi_battery_present(battery))
 416                 return 0;
 417         mutex_lock(&battery->lock);
 418         status = acpi_evaluate_object(battery->device->handle, name,
 419                                                 NULL, &buffer);
 420         mutex_unlock(&battery->lock);
 421
 422         if (ACPI_FAILURE(status)) {
 423                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name));
 424                 return -ENODEV;
 425         }
 426         if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags))
 427                 result = extract_package(battery, buffer.pointer,
 428                                 extended_info_offsets,
 429                                 ARRAY_SIZE(extended_info_offsets));
 430         else
 431                 result = extract_package(battery, buffer.pointer,
 432                                 info_offsets, ARRAY_SIZE(info_offsets));
 433         kfree(buffer.pointer);
 434         return result;
 435 }
 436
 437 static int acpi_battery_get_state(struct acpi_battery *battery)
 438 {
 439         int result = 0;
 440         acpi_status status = 0;
 441         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 442
 443         if (!acpi_battery_present(battery))
 444                 return 0;
 445
 446         if (battery->update_time &&
 447             time_before(jiffies, battery->update_time +
 448                         msecs_to_jiffies(cache_time)))
 449                 return 0;
 450
 451         mutex_lock(&battery->lock);
 452         status = acpi_evaluate_object(battery->device->handle, "_BST",
 453                                       NULL, &buffer);
 454         mutex_unlock(&battery->lock);
 455
 456         if (ACPI_FAILURE(status)) {
 457                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
 458                 return -ENODEV;
 459         }
 460
 461         result = extract_package(battery, buffer.pointer,
 462                                  state_offsets, ARRAY_SIZE(state_offsets));
 463         battery->update_time = jiffies;
 464         kfree(buffer.pointer);
 465
 466         if (test_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags) &&
 467             battery->rate_now != -1)
 468                 battery->rate_now = abs((s16)battery->rate_now);
 469
 470         return result;
 471 }
 472
 473 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 474 {
 475         acpi_status status = 0;
 476         union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
 477         struct acpi_object_list arg_list = { 1, &arg0 };
 478
 479         if (!acpi_battery_present(battery) ||
 480             !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
 481                 return -ENODEV;
 482
 483         arg0.integer.value = battery->alarm;
 484
 485         mutex_lock(&battery->lock);
 486         status = acpi_evaluate_object(battery->device->handle, "_BTP",
 487                                  &arg_list, NULL);
 488         mutex_unlock(&battery->lock);
 489
 490         if (ACPI_FAILURE(status))
 491                 return -ENODEV;
 492
 493         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
 494         return 0;
 495 }
 496
 497 static int acpi_battery_init_alarm(struct acpi_battery *battery)
 498 {
 499         acpi_status status = AE_OK;
 500         acpi_handle handle = NULL;
 501
 502         /* See if alarms are supported, and if so, set default */
 503         status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
 504         if (ACPI_FAILURE(status)) {
 505                 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
 506                 return 0;
 507         }
 508         set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
 509         if (!battery->alarm)
 510                 battery->alarm = battery->design_capacity_warning;
 511         return acpi_battery_set_alarm(battery);
 512 }
 513
 514 #ifdef CONFIG_ACPI_SYSFS_POWER
 515 static ssize_t acpi_battery_alarm_show(struct device *dev,
 516                                         struct device_attribute *attr,
 517                                         char *buf)
 518 {
 519         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 520         return sprintf(buf, "%d\n", battery->alarm * 1000);
 521 }
 522
 523 static ssize_t acpi_battery_alarm_store(struct device *dev,
 524                                         struct device_attribute *attr,
 525                                         const char *buf, size_t count)
 526 {
 527         unsigned long x;
 528         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 529         if (sscanf(buf, "%ld\n", &x) == 1)
 530                 battery->alarm = x/1000;
 531         if (acpi_battery_present(battery))
 532                 acpi_battery_set_alarm(battery);
 533         return count;
 534 }
 535
 536 static struct device_attribute alarm_attr = {
 537         .attr = {.name = "alarm", .mode = 0644},
 538         .show = acpi_battery_alarm_show,
 539         .store = acpi_battery_alarm_store,
 540 };
 541
 542 static int sysfs_add_battery(struct acpi_battery *battery)
 543 {
 544         int result;
 545
 546         if (battery->power_unit) {
 547                 battery->bat.properties = charge_battery_props;
 548                 battery->bat.num_properties =
 549                         ARRAY_SIZE(charge_battery_props);
 550         } else {
 551                 battery->bat.properties = energy_battery_props;
 552                 battery->bat.num_properties =
 553                         ARRAY_SIZE(energy_battery_props);
 554         }
 555
 556         battery->bat.name = acpi_device_bid(battery->device);
 557         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 558         battery->bat.get_property = acpi_battery_get_property;
 559
 560         result = power_supply_register(&battery->device->dev, &battery->bat);
 561         if (result)
 562                 return result;
 563         return device_create_file(battery->bat.dev, &alarm_attr);
 564 }
 565
 566 static void sysfs_remove_battery(struct acpi_battery *battery)
 567 {
 568         if (!battery->bat.dev)
 569                 return;
 570         device_remove_file(battery->bat.dev, &alarm_attr);
 571         power_supply_unregister(&battery->bat);
 572         battery->bat.dev = NULL;
 573 }
 574 #endif
 575
 576 static void acpi_battery_quirks(struct acpi_battery *battery)
 577 {
 578         if (dmi_name_in_vendors("Acer") && battery->power_unit) {
 579                 set_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags);
 580         }
 581 }
 582
 583 static int acpi_battery_update(struct acpi_battery *battery)
 584 {
 585         int result, old_present = acpi_battery_present(battery);
 586         result = acpi_battery_get_status(battery);
 587         if (result)
 588                 return result;
 589         if (!acpi_battery_present(battery)) {
 590 #ifdef CONFIG_ACPI_SYSFS_POWER
 591                 sysfs_remove_battery(battery);
 592 #endif
 593                 battery->update_time = 0;
 594                 return 0;
 595         }
 596         if (!battery->update_time ||
 597             old_present != acpi_battery_present(battery)) {
 598                 result = acpi_battery_get_info(battery);
 599                 if (result)
 600                         return result;
 601                 acpi_battery_quirks(battery);
 602                 acpi_battery_init_alarm(battery);
 603         }
 604 #ifdef CONFIG_ACPI_SYSFS_POWER
 605         if (!battery->bat.dev)
 606                 sysfs_add_battery(battery);
 607 #endif
 608         return acpi_battery_get_state(battery);
 609 }
 610
 611 /* --------------------------------------------------------------------------
 612                               FS Interface (/proc)
 613    -------------------------------------------------------------------------- */
 614
 615 #ifdef CONFIG_ACPI_PROCFS_POWER
 616 static struct proc_dir_entry *acpi_battery_dir;
 617
 618 static int acpi_battery_print_info(struct seq_file *seq, int result)
 619 {
 620         struct acpi_battery *battery = seq->private;
 621
 622         if (result)
 623                 goto end;
 624
 625         seq_printf(seq, "present:                 %s\n",
 626                    acpi_battery_present(battery)?"yes":"no");
 627         if (!acpi_battery_present(battery))
 628                 goto end;
 629         if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 630                 seq_printf(seq, "design capacity:         unknown\n");
 631         else
 632                 seq_printf(seq, "design capacity:         %d %sh\n",
 633                            battery->design_capacity,
 634                            acpi_battery_units(battery));
 635
 636         if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 637                 seq_printf(seq, "last full capacity:      unknown\n");
 638         else
 639                 seq_printf(seq, "last full capacity:      %d %sh\n",
 640                            battery->full_charge_capacity,
 641                            acpi_battery_units(battery));
 642
 643         seq_printf(seq, "battery technology:      %srechargeable\n",
 644                    (!battery->technology)?"non-":"");
 645
 646         if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 647                 seq_printf(seq, "design voltage:          unknown\n");
 648         else
 649                 seq_printf(seq, "design voltage:          %d mV\n",
 650                            battery->design_voltage);
 651         seq_printf(seq, "design capacity warning: %d %sh\n",
 652                    battery->design_capacity_warning,
 653                    acpi_battery_units(battery));
 654         seq_printf(seq, "design capacity low:     %d %sh\n",
 655                    battery->design_capacity_low,
 656                    acpi_battery_units(battery));
 657         seq_printf(seq, "cycle count:             %i\n", battery->cycle_count);
 658         seq_printf(seq, "capacity granularity 1:  %d %sh\n",
 659                    battery->capacity_granularity_1,
 660                    acpi_battery_units(battery));
 661         seq_printf(seq, "capacity granularity 2:  %d %sh\n",
 662                    battery->capacity_granularity_2,
 663                    acpi_battery_units(battery));
 664         seq_printf(seq, "model number:            %s\n", battery->model_number);
 665         seq_printf(seq, "serial number:           %s\n", battery->serial_number);
 666         seq_printf(seq, "battery type:            %s\n", battery->type);
 667         seq_printf(seq, "OEM info:                %s\n", battery->oem_info);
 668       end:
 669         if (result)
 670                 seq_printf(seq, "ERROR: Unable to read battery info\n");
 671         return result;
 672 }
 673
 674 static int acpi_battery_print_state(struct seq_file *seq, int result)
 675 {
 676         struct acpi_battery *battery = seq->private;
 677
 678         if (result)
 679                 goto end;
 680
 681         seq_printf(seq, "present:                 %s\n",
 682                    acpi_battery_present(battery)?"yes":"no");
 683         if (!acpi_battery_present(battery))
 684                 goto end;
 685
 686         seq_printf(seq, "capacity state:          %s\n",
 687                         (battery->state & 0x04)?"critical":"ok");
 688         if ((battery->state & 0x01) && (battery->state & 0x02))
 689                 seq_printf(seq,
 690                            "charging state:          charging/discharging\n");
 691         else if (battery->state & 0x01)
 692                 seq_printf(seq, "charging state:          discharging\n");
 693         else if (battery->state & 0x02)
 694                 seq_printf(seq, "charging state:          charging\n");
 695         else
 696                 seq_printf(seq, "charging state:          charged\n");
 697
 698         if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
 699                 seq_printf(seq, "present rate:            unknown\n");
 700         else
 701                 seq_printf(seq, "present rate:            %d %s\n",
 702                            battery->rate_now, acpi_battery_units(battery));
 703
 704         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
 705                 seq_printf(seq, "remaining capacity:      unknown\n");
 706         else
 707                 seq_printf(seq, "remaining capacity:      %d %sh\n",
 708                            battery->capacity_now, acpi_battery_units(battery));
 709         if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
 710                 seq_printf(seq, "present voltage:         unknown\n");
 711         else
 712                 seq_printf(seq, "present voltage:         %d mV\n",
 713                            battery->voltage_now);
 714       end:
 715         if (result)
 716                 seq_printf(seq, "ERROR: Unable to read battery state\n");
 717
 718         return result;
 719 }
 720
 721 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
 722 {
 723         struct acpi_battery *battery = seq->private;
 724
 725         if (result)
 726                 goto end;
 727
 728         if (!acpi_battery_present(battery)) {
 729                 seq_printf(seq, "present:                 no\n");
 730                 goto end;
 731         }
 732         seq_printf(seq, "alarm:                   ");
 733         if (!battery->alarm)
 734                 seq_printf(seq, "unsupported\n");
 735         else
 736                 seq_printf(seq, "%u %sh\n", battery->alarm,
 737                                 acpi_battery_units(battery));
 738       end:
 739         if (result)
 740                 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
 741         return result;
 742 }
 743
 744 static ssize_t acpi_battery_write_alarm(struct file *file,
 745                                         const char __user * buffer,
 746                                         size_t count, loff_t * ppos)
 747 {
 748         int result = 0;
 749         char alarm_string[12] = { '\0' };
 750         struct seq_file *m = file->private_data;
 751         struct acpi_battery *battery = m->private;
 752
 753         if (!battery || (count > sizeof(alarm_string) - 1))
 754                 return -EINVAL;
 755         if (!acpi_battery_present(battery)) {
 756                 result = -ENODEV;
 757                 goto end;
 758         }
 759         if (copy_from_user(alarm_string, buffer, count)) {
 760                 result = -EFAULT;
 761                 goto end;
 762         }
 763         alarm_string[count] = '\0';
 764         battery->alarm = simple_strtol(alarm_string, NULL, 0);
 765         result = acpi_battery_set_alarm(battery);
 766       end:
 767         if (!result)
 768                 return count;
 769         return result;
 770 }
 771
 772 typedef int(*print_func)(struct seq_file *seq, int result);
 773
 774 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
 775         acpi_battery_print_info,
 776         acpi_battery_print_state,
 777         acpi_battery_print_alarm,
 778 };
 779
 780 static int acpi_battery_read(int fid, struct seq_file *seq)
 781 {
 782         struct acpi_battery *battery = seq->private;
 783         int result = acpi_battery_update(battery);
 784         return acpi_print_funcs[fid](seq, result);
 785 }
 786
 787 #define DECLARE_FILE_FUNCTIONS(_name) \
 788 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
 789 { \
 790         return acpi_battery_read(_name##_tag, seq); \
 791 } \
 792 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
 793 { \
 794         return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
 795 }
 796
 797 DECLARE_FILE_FUNCTIONS(info);
 798 DECLARE_FILE_FUNCTIONS(state);
 799 DECLARE_FILE_FUNCTIONS(alarm);
 800
 801 #undef DECLARE_FILE_FUNCTIONS
 802
 803 #define FILE_DESCRIPTION_RO(_name) \
 804         { \
 805         .name = __stringify(_name), \
 806         .mode = S_IRUGO, \
 807         .ops = { \
 808                 .open = acpi_battery_##_name##_open_fs, \
 809                 .read = seq_read, \
 810                 .llseek = seq_lseek, \
 811                 .release = single_release, \
 812                 .owner = THIS_MODULE, \
 813                 }, \
 814         }
 815
 816 #define FILE_DESCRIPTION_RW(_name) \
 817         { \
 818         .name = __stringify(_name), \
 819         .mode = S_IFREG | S_IRUGO | S_IWUSR, \
 820         .ops = { \
 821                 .open = acpi_battery_##_name##_open_fs, \
 822                 .read = seq_read, \
 823                 .llseek = seq_lseek, \
 824                 .write = acpi_battery_write_##_name, \
 825                 .release = single_release, \
 826                 .owner = THIS_MODULE, \
 827                 }, \
 828         }
 829
 830 static struct battery_file {
 831         struct file_operations ops;
 832         mode_t mode;
 833         const char *name;
 834 } acpi_battery_file[] = {
 835         FILE_DESCRIPTION_RO(info),
 836         FILE_DESCRIPTION_RO(state),
 837         FILE_DESCRIPTION_RW(alarm),
 838 };
 839
 840 #undef FILE_DESCRIPTION_RO
 841 #undef FILE_DESCRIPTION_RW
 842
 843 static int acpi_battery_add_fs(struct acpi_device *device)
 844 {
 845         struct proc_dir_entry *entry = NULL;
 846         int i;
 847
 848         if (!acpi_device_dir(device)) {
 849                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 850                                                      acpi_battery_dir);
 851                 if (!acpi_device_dir(device))
 852                         return -ENODEV;
 853         }
 854
 855         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
 856                 entry = proc_create_data(acpi_battery_file[i].name,
 857                                          acpi_battery_file[i].mode,
 858                                          acpi_device_dir(device),
 859                                          &acpi_battery_file[i].ops,
 860                                          acpi_driver_data(device));
 861                 if (!entry)
 862                         return -ENODEV;
 863         }
 864         return 0;
 865 }
 866
 867 static void acpi_battery_remove_fs(struct acpi_device *device)
 868 {
 869         int i;
 870         if (!acpi_device_dir(device))
 871                 return;
 872         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
 873                 remove_proc_entry(acpi_battery_file[i].name,
 874                                   acpi_device_dir(device));
 875
 876         remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
 877         acpi_device_dir(device) = NULL;
 878 }
 879
 880 #endif
 881
 882 /* --------------------------------------------------------------------------
 883                                  Driver Interface
 884    -------------------------------------------------------------------------- */
 885
 886 static void acpi_battery_notify(struct acpi_device *device, u32 event)
 887 {
 888         struct acpi_battery *battery = acpi_driver_data(device);
 889 #ifdef CONFIG_ACPI_SYSFS_POWER
 890         struct device *old;
 891 #endif
 892
 893         if (!battery)
 894                 return;
 895 #ifdef CONFIG_ACPI_SYSFS_POWER
 896         old = battery->bat.dev;
 897 #endif
 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 #ifdef CONFIG_ACPI_SYSFS_POWER
 905         /* acpi_battery_update could remove power_supply object */
 906         if (old && battery->bat.dev)
 907                 power_supply_changed(&battery->bat);
 908 #endif
 909 }
 910
 911 static int acpi_battery_add(struct acpi_device *device)
 912 {
 913         int result = 0;
 914         struct acpi_battery *battery = NULL;
 915         acpi_handle handle;
 916         if (!device)
 917                 return -EINVAL;
 918         battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
 919         if (!battery)
 920                 return -ENOMEM;
 921         battery->device = device;
 922         strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
 923         strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
 924         device->driver_data = battery;
 925         mutex_init(&battery->lock);
 926         if (ACPI_SUCCESS(acpi_get_handle(battery->device->handle,
 927                         "_BIX", &handle)))
 928                 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
 929         acpi_battery_update(battery);
 930 #ifdef CONFIG_ACPI_PROCFS_POWER
 931         result = acpi_battery_add_fs(device);
 932 #endif
 933         if (!result) {
 934                 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
 935                         ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
 936                         device->status.battery_present ? "present" : "absent");
 937         } else {
 938 #ifdef CONFIG_ACPI_PROCFS_POWER
 939                 acpi_battery_remove_fs(device);
 940 #endif
 941                 kfree(battery);
 942         }
 943         return result;
 944 }
 945
 946 static int acpi_battery_remove(struct acpi_device *device, int type)
 947 {
 948         struct acpi_battery *battery = NULL;
 949
 950         if (!device || !acpi_driver_data(device))
 951                 return -EINVAL;
 952         battery = acpi_driver_data(device);
 953 #ifdef CONFIG_ACPI_PROCFS_POWER
 954         acpi_battery_remove_fs(device);
 955 #endif
 956 #ifdef CONFIG_ACPI_SYSFS_POWER
 957         sysfs_remove_battery(battery);
 958 #endif
 959         mutex_destroy(&battery->lock);
 960         kfree(battery);
 961         return 0;
 962 }
 963
 964 /* this is needed to learn about changes made in suspended state */
 965 static int acpi_battery_resume(struct acpi_device *device)
 966 {
 967         struct acpi_battery *battery;
 968         if (!device)
 969                 return -EINVAL;
 970         battery = acpi_driver_data(device);
 971         battery->update_time = 0;
 972         acpi_battery_update(battery);
 973         return 0;
 974 }
 975
 976 static struct acpi_driver acpi_battery_driver = {
 977         .name = "battery",
 978         .class = ACPI_BATTERY_CLASS,
 979         .ids = battery_device_ids,
 980         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
 981         .ops = {
 982                 .add = acpi_battery_add,
 983                 .resume = acpi_battery_resume,
 984                 .remove = acpi_battery_remove,
 985                 .notify = acpi_battery_notify,
 986                 },
 987 };
 988
 989 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
 990 {
 991         if (acpi_disabled)
 992                 return;
 993 #ifdef CONFIG_ACPI_PROCFS_POWER
 994         acpi_battery_dir = acpi_lock_battery_dir();
 995         if (!acpi_battery_dir)
 996                 return;
 997 #endif
 998         if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
 999 #ifdef CONFIG_ACPI_PROCFS_POWER
1000                 acpi_unlock_battery_dir(acpi_battery_dir);
1001 #endif
1002                 return;
1003         }
1004         return;
1005 }
1006
1007 static int __init acpi_battery_init(void)
1008 {
1009         async_schedule(acpi_battery_init_async, NULL);
1010         return 0;
1011 }
1012
1013 static void __exit acpi_battery_exit(void)
1014 {
1015         acpi_bus_unregister_driver(&acpi_battery_driver);
1016 #ifdef CONFIG_ACPI_PROCFS_POWER
1017         acpi_unlock_battery_dir(acpi_battery_dir);
1018 #endif
1019 }
1020
1021 module_init(acpi_battery_init);
1022 module_exit(acpi_battery_exit);