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
  36 #ifdef CONFIG_ACPI_PROCFS_POWER
  37 #include <linux/proc_fs.h>
  38 #include <linux/seq_file.h>
  39 #include <asm/uaccess.h>
  40 #endif
  41
  42 #include <acpi/acpi_bus.h>
  43 #include <acpi/acpi_drivers.h>
  44
  45 #ifdef CONFIG_ACPI_SYSFS_POWER
  46 #include <linux/power_supply.h>
  47 #endif
  48
  49 #define PREFIX "ACPI: "
  50
  51 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
  52
  53 #define ACPI_BATTERY_CLASS              "battery"
  54 #define ACPI_BATTERY_DEVICE_NAME        "Battery"
  55 #define ACPI_BATTERY_NOTIFY_STATUS      0x80
  56 #define ACPI_BATTERY_NOTIFY_INFO        0x81
  57
  58 #define _COMPONENT              ACPI_BATTERY_COMPONENT
  59
  60 ACPI_MODULE_NAME("battery");
  61
  62 MODULE_AUTHOR("Paul Diefenbaugh");
  63 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
  64 MODULE_DESCRIPTION("ACPI Battery Driver");
  65 MODULE_LICENSE("GPL");
  66
  67 static unsigned int cache_time = 1000;
  68 module_param(cache_time, uint, 0644);
  69 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  70
  71 #ifdef CONFIG_ACPI_PROCFS_POWER
  72 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
  73 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
  74
  75 enum acpi_battery_files {
  76         info_tag = 0,
  77         state_tag,
  78         alarm_tag,
  79         ACPI_BATTERY_NUMFILES,
  80 };
  81
  82 #endif
  83
  84 static const struct acpi_device_id battery_device_ids[] = {
  85         {"PNP0C0A", 0},
  86         {"", 0},
  87 };
  88
  89 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
  90
  91 enum {
  92         ACPI_BATTERY_ALARM_PRESENT,
  93         /* For buggy DSDTs that report negative 16-bit values for either charging
  94         * or discharging current and/or report 0 as 65536 due to bad math.
  95         */
  96         ACPI_BATTERY_QUIRK_SIGNED16_CURRENT,
  97 };
  98
  99 struct acpi_battery {
 100         struct mutex lock;
 101 #ifdef CONFIG_ACPI_SYSFS_POWER
 102         struct power_supply bat;
 103 #endif
 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 capacity_granularity_1;
 116         int capacity_granularity_2;
 117         int alarm;
 118         char model_number[32];
 119         char serial_number[32];
 120         char type[32];
 121         char oem_info[32];
 122         int state;
 123         int power_unit;
 124         unsigned long flags;
 125 };
 126
 127 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
 128
 129 inline int acpi_battery_present(struct acpi_battery *battery)
 130 {
 131         return battery->device->status.battery_present;
 132 }
 133
 134 #ifdef CONFIG_ACPI_SYSFS_POWER
 135 static int acpi_battery_technology(struct acpi_battery *battery)
 136 {
 137         if (!strcasecmp("NiCd", battery->type))
 138                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 139         if (!strcasecmp("NiMH", battery->type))
 140                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 141         if (!strcasecmp("LION", battery->type))
 142                 return POWER_SUPPLY_TECHNOLOGY_LION;
 143         if (!strncasecmp("LI-ION", battery->type, 6))
 144                 return POWER_SUPPLY_TECHNOLOGY_LION;
 145         if (!strcasecmp("LiP", battery->type))
 146                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 147         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 148 }
 149
 150 static int acpi_battery_get_state(struct acpi_battery *battery);
 151
 152 static int acpi_battery_is_charged(struct acpi_battery *battery)
 153 {
 154         /* either charging or discharging */
 155         if (battery->state != 0)
 156                 return 0;
 157
 158         /* battery not reporting charge */
 159         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
 160             battery->capacity_now == 0)
 161                 return 0;
 162
 163         /* good batteries update full_charge as the batteries degrade */
 164         if (battery->full_charge_capacity == battery->capacity_now)
 165                 return 1;
 166
 167         /* fallback to using design values for broken batteries */
 168         if (battery->design_capacity == battery->capacity_now)
 169                 return 1;
 170
 171         /* we don't do any sort of metric based on percentages */
 172         return 0;
 173 }
 174
 175 static int acpi_battery_get_property(struct power_supply *psy,
 176                                      enum power_supply_property psp,
 177                                      union power_supply_propval *val)
 178 {
 179         struct acpi_battery *battery = to_acpi_battery(psy);
 180
 181         if (acpi_battery_present(battery)) {
 182                 /* run battery update only if it is present */
 183                 acpi_battery_get_state(battery);
 184         } else if (psp != POWER_SUPPLY_PROP_PRESENT)
 185                 return -ENODEV;
 186         switch (psp) {
 187         case POWER_SUPPLY_PROP_STATUS:
 188                 if (battery->state & 0x01)
 189                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 190                 else if (battery->state & 0x02)
 191                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 192                 else if (acpi_battery_is_charged(battery))
 193                         val->intval = POWER_SUPPLY_STATUS_FULL;
 194                 else
 195                         val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 196                 break;
 197         case POWER_SUPPLY_PROP_PRESENT:
 198                 val->intval = acpi_battery_present(battery);
 199                 break;
 200         case POWER_SUPPLY_PROP_TECHNOLOGY:
 201                 val->intval = acpi_battery_technology(battery);
 202                 break;
 203         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 204                 val->intval = battery->design_voltage * 1000;
 205                 break;
 206         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 207                 val->intval = battery->voltage_now * 1000;
 208                 break;
 209         case POWER_SUPPLY_PROP_CURRENT_NOW:
 210         case POWER_SUPPLY_PROP_POWER_NOW:
 211                 val->intval = battery->rate_now * 1000;
 212                 break;
 213         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 214         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 215                 val->intval = battery->design_capacity * 1000;
 216                 break;
 217         case POWER_SUPPLY_PROP_CHARGE_FULL:
 218         case POWER_SUPPLY_PROP_ENERGY_FULL:
 219                 val->intval = battery->full_charge_capacity * 1000;
 220                 break;
 221         case POWER_SUPPLY_PROP_CHARGE_NOW:
 222         case POWER_SUPPLY_PROP_ENERGY_NOW:
 223                 val->intval = battery->capacity_now * 1000;
 224                 break;
 225         case POWER_SUPPLY_PROP_MODEL_NAME:
 226                 val->strval = battery->model_number;
 227                 break;
 228         case POWER_SUPPLY_PROP_MANUFACTURER:
 229                 val->strval = battery->oem_info;
 230                 break;
 231         case POWER_SUPPLY_PROP_SERIAL_NUMBER:
 232                 val->strval = battery->serial_number;
 233                 break;
 234         default:
 235                 return -EINVAL;
 236         }
 237         return 0;
 238 }
 239
 240 static enum power_supply_property charge_battery_props[] = {
 241         POWER_SUPPLY_PROP_STATUS,
 242         POWER_SUPPLY_PROP_PRESENT,
 243         POWER_SUPPLY_PROP_TECHNOLOGY,
 244         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 245         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 246         POWER_SUPPLY_PROP_CURRENT_NOW,
 247         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 248         POWER_SUPPLY_PROP_CHARGE_FULL,
 249         POWER_SUPPLY_PROP_CHARGE_NOW,
 250         POWER_SUPPLY_PROP_MODEL_NAME,
 251         POWER_SUPPLY_PROP_MANUFACTURER,
 252         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 253 };
 254
 255 static enum power_supply_property energy_battery_props[] = {
 256         POWER_SUPPLY_PROP_STATUS,
 257         POWER_SUPPLY_PROP_PRESENT,
 258         POWER_SUPPLY_PROP_TECHNOLOGY,
 259         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 260         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 261         POWER_SUPPLY_PROP_CURRENT_NOW,
 262         POWER_SUPPLY_PROP_POWER_NOW,
 263         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 264         POWER_SUPPLY_PROP_ENERGY_FULL,
 265         POWER_SUPPLY_PROP_ENERGY_NOW,
 266         POWER_SUPPLY_PROP_MODEL_NAME,
 267         POWER_SUPPLY_PROP_MANUFACTURER,
 268         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 269 };
 270 #endif
 271
 272 #ifdef CONFIG_ACPI_PROCFS_POWER
 273 inline char *acpi_battery_units(struct acpi_battery *battery)
 274 {
 275         return (battery->power_unit)?"mA":"mW";
 276 }
 277 #endif
 278
 279 /* --------------------------------------------------------------------------
 280                                Battery Management
 281    -------------------------------------------------------------------------- */
 282 struct acpi_offsets {
 283         size_t offset;          /* offset inside struct acpi_sbs_battery */
 284         u8 mode;                /* int or string? */
 285 };
 286
 287 static struct acpi_offsets state_offsets[] = {
 288         {offsetof(struct acpi_battery, state), 0},
 289         {offsetof(struct acpi_battery, rate_now), 0},
 290         {offsetof(struct acpi_battery, capacity_now), 0},
 291         {offsetof(struct acpi_battery, voltage_now), 0},
 292 };
 293
 294 static struct acpi_offsets info_offsets[] = {
 295         {offsetof(struct acpi_battery, power_unit), 0},
 296         {offsetof(struct acpi_battery, design_capacity), 0},
 297         {offsetof(struct acpi_battery, full_charge_capacity), 0},
 298         {offsetof(struct acpi_battery, technology), 0},
 299         {offsetof(struct acpi_battery, design_voltage), 0},
 300         {offsetof(struct acpi_battery, design_capacity_warning), 0},
 301         {offsetof(struct acpi_battery, design_capacity_low), 0},
 302         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
 303         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
 304         {offsetof(struct acpi_battery, model_number), 1},
 305         {offsetof(struct acpi_battery, serial_number), 1},
 306         {offsetof(struct acpi_battery, type), 1},
 307         {offsetof(struct acpi_battery, oem_info), 1},
 308 };
 309
 310 static int extract_package(struct acpi_battery *battery,
 311                            union acpi_object *package,
 312                            struct acpi_offsets *offsets, int num)
 313 {
 314         int i;
 315         union acpi_object *element;
 316         if (package->type != ACPI_TYPE_PACKAGE)
 317                 return -EFAULT;
 318         for (i = 0; i < num; ++i) {
 319                 if (package->package.count <= i)
 320                         return -EFAULT;
 321                 element = &package->package.elements[i];
 322                 if (offsets[i].mode) {
 323                         u8 *ptr = (u8 *)battery + offsets[i].offset;
 324                         if (element->type == ACPI_TYPE_STRING ||
 325                             element->type == ACPI_TYPE_BUFFER)
 326                                 strncpy(ptr, element->string.pointer, 32);
 327                         else if (element->type == ACPI_TYPE_INTEGER) {
 328                                 strncpy(ptr, (u8 *)&element->integer.value,
 329                                         sizeof(acpi_integer));
 330                                 ptr[sizeof(acpi_integer)] = 0;
 331                         } else
 332                                 *ptr = 0; /* don't have value */
 333                 } else {
 334                         int *x = (int *)((u8 *)battery + offsets[i].offset);
 335                         *x = (element->type == ACPI_TYPE_INTEGER) ?
 336                                 element->integer.value : -1;
 337                 }
 338         }
 339         return 0;
 340 }
 341
 342 static int acpi_battery_get_status(struct acpi_battery *battery)
 343 {
 344         if (acpi_bus_get_status(battery->device)) {
 345                 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
 346                 return -ENODEV;
 347         }
 348         return 0;
 349 }
 350
 351 static int acpi_battery_get_info(struct acpi_battery *battery)
 352 {
 353         int result = -EFAULT;
 354         acpi_status status = 0;
 355         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 356
 357         if (!acpi_battery_present(battery))
 358                 return 0;
 359         mutex_lock(&battery->lock);
 360         status = acpi_evaluate_object(battery->device->handle, "_BIF",
 361                                       NULL, &buffer);
 362         mutex_unlock(&battery->lock);
 363
 364         if (ACPI_FAILURE(status)) {
 365                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
 366                 return -ENODEV;
 367         }
 368
 369         result = extract_package(battery, buffer.pointer,
 370                                  info_offsets, ARRAY_SIZE(info_offsets));
 371         kfree(buffer.pointer);
 372         return result;
 373 }
 374
 375 static int acpi_battery_get_state(struct acpi_battery *battery)
 376 {
 377         int result = 0;
 378         acpi_status status = 0;
 379         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 380
 381         if (!acpi_battery_present(battery))
 382                 return 0;
 383
 384         if (battery->update_time &&
 385             time_before(jiffies, battery->update_time +
 386                         msecs_to_jiffies(cache_time)))
 387                 return 0;
 388
 389         mutex_lock(&battery->lock);
 390         status = acpi_evaluate_object(battery->device->handle, "_BST",
 391                                       NULL, &buffer);
 392         mutex_unlock(&battery->lock);
 393
 394         if (ACPI_FAILURE(status)) {
 395                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
 396                 return -ENODEV;
 397         }
 398
 399         result = extract_package(battery, buffer.pointer,
 400                                  state_offsets, ARRAY_SIZE(state_offsets));
 401         battery->update_time = jiffies;
 402         kfree(buffer.pointer);
 403
 404         if (test_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags) &&
 405             battery->rate_now != -1)
 406                 battery->rate_now = abs((s16)battery->rate_now);
 407
 408         return result;
 409 }
 410
 411 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 412 {
 413         acpi_status status = 0;
 414         union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
 415         struct acpi_object_list arg_list = { 1, &arg0 };
 416
 417         if (!acpi_battery_present(battery)||
 418             !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
 419                 return -ENODEV;
 420
 421         arg0.integer.value = battery->alarm;
 422
 423         mutex_lock(&battery->lock);
 424         status = acpi_evaluate_object(battery->device->handle, "_BTP",
 425                                  &arg_list, NULL);
 426         mutex_unlock(&battery->lock);
 427
 428         if (ACPI_FAILURE(status))
 429                 return -ENODEV;
 430
 431         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
 432         return 0;
 433 }
 434
 435 static int acpi_battery_init_alarm(struct acpi_battery *battery)
 436 {
 437         acpi_status status = AE_OK;
 438         acpi_handle handle = NULL;
 439
 440         /* See if alarms are supported, and if so, set default */
 441         status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
 442         if (ACPI_FAILURE(status)) {
 443                 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
 444                 return 0;
 445         }
 446         set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
 447         if (!battery->alarm)
 448                 battery->alarm = battery->design_capacity_warning;
 449         return acpi_battery_set_alarm(battery);
 450 }
 451
 452 #ifdef CONFIG_ACPI_SYSFS_POWER
 453 static ssize_t acpi_battery_alarm_show(struct device *dev,
 454                                         struct device_attribute *attr,
 455                                         char *buf)
 456 {
 457         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 458         return sprintf(buf, "%d\n", battery->alarm * 1000);
 459 }
 460
 461 static ssize_t acpi_battery_alarm_store(struct device *dev,
 462                                         struct device_attribute *attr,
 463                                         const char *buf, size_t count)
 464 {
 465         unsigned long x;
 466         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 467         if (sscanf(buf, "%ld\n", &x) == 1)
 468                 battery->alarm = x/1000;
 469         if (acpi_battery_present(battery))
 470                 acpi_battery_set_alarm(battery);
 471         return count;
 472 }
 473
 474 static struct device_attribute alarm_attr = {
 475         .attr = {.name = "alarm", .mode = 0644},
 476         .show = acpi_battery_alarm_show,
 477         .store = acpi_battery_alarm_store,
 478 };
 479
 480 static int sysfs_add_battery(struct acpi_battery *battery)
 481 {
 482         int result;
 483
 484         if (battery->power_unit) {
 485                 battery->bat.properties = charge_battery_props;
 486                 battery->bat.num_properties =
 487                         ARRAY_SIZE(charge_battery_props);
 488         } else {
 489                 battery->bat.properties = energy_battery_props;
 490                 battery->bat.num_properties =
 491                         ARRAY_SIZE(energy_battery_props);
 492         }
 493
 494         battery->bat.name = acpi_device_bid(battery->device);
 495         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 496         battery->bat.get_property = acpi_battery_get_property;
 497
 498         result = power_supply_register(&battery->device->dev, &battery->bat);
 499         if (result)
 500                 return result;
 501         return device_create_file(battery->bat.dev, &alarm_attr);
 502 }
 503
 504 static void sysfs_remove_battery(struct acpi_battery *battery)
 505 {
 506         if (!battery->bat.dev)
 507                 return;
 508         device_remove_file(battery->bat.dev, &alarm_attr);
 509         power_supply_unregister(&battery->bat);
 510         battery->bat.dev = NULL;
 511 }
 512 #endif
 513
 514 static void acpi_battery_quirks(struct acpi_battery *battery)
 515 {
 516         if (dmi_name_in_vendors("Acer") && battery->power_unit) {
 517                 set_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags);
 518         }
 519 }
 520
 521 static int acpi_battery_update(struct acpi_battery *battery)
 522 {
 523         int result, old_present = acpi_battery_present(battery);
 524         result = acpi_battery_get_status(battery);
 525         if (result)
 526                 return result;
 527 #ifdef CONFIG_ACPI_SYSFS_POWER
 528         if (!acpi_battery_present(battery)) {
 529                 sysfs_remove_battery(battery);
 530                 battery->update_time = 0;
 531                 return 0;
 532         }
 533 #endif
 534         if (!battery->update_time ||
 535             old_present != acpi_battery_present(battery)) {
 536                 result = acpi_battery_get_info(battery);
 537                 if (result)
 538                         return result;
 539                 acpi_battery_quirks(battery);
 540                 acpi_battery_init_alarm(battery);
 541         }
 542 #ifdef CONFIG_ACPI_SYSFS_POWER
 543         if (!battery->bat.dev)
 544                 sysfs_add_battery(battery);
 545 #endif
 546         return acpi_battery_get_state(battery);
 547 }
 548
 549 /* --------------------------------------------------------------------------
 550                               FS Interface (/proc)
 551    -------------------------------------------------------------------------- */
 552
 553 #ifdef CONFIG_ACPI_PROCFS_POWER
 554 static struct proc_dir_entry *acpi_battery_dir;
 555
 556 static int acpi_battery_print_info(struct seq_file *seq, int result)
 557 {
 558         struct acpi_battery *battery = seq->private;
 559
 560         if (result)
 561                 goto end;
 562
 563         seq_printf(seq, "present:                 %s\n",
 564                    acpi_battery_present(battery)?"yes":"no");
 565         if (!acpi_battery_present(battery))
 566                 goto end;
 567         if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 568                 seq_printf(seq, "design capacity:         unknown\n");
 569         else
 570                 seq_printf(seq, "design capacity:         %d %sh\n",
 571                            battery->design_capacity,
 572                            acpi_battery_units(battery));
 573
 574         if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 575                 seq_printf(seq, "last full capacity:      unknown\n");
 576         else
 577                 seq_printf(seq, "last full capacity:      %d %sh\n",
 578                            battery->full_charge_capacity,
 579                            acpi_battery_units(battery));
 580
 581         seq_printf(seq, "battery technology:      %srechargeable\n",
 582                    (!battery->technology)?"non-":"");
 583
 584         if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 585                 seq_printf(seq, "design voltage:          unknown\n");
 586         else
 587                 seq_printf(seq, "design voltage:          %d mV\n",
 588                            battery->design_voltage);
 589         seq_printf(seq, "design capacity warning: %d %sh\n",
 590                    battery->design_capacity_warning,
 591                    acpi_battery_units(battery));
 592         seq_printf(seq, "design capacity low:     %d %sh\n",
 593                    battery->design_capacity_low,
 594                    acpi_battery_units(battery));
 595         seq_printf(seq, "capacity granularity 1:  %d %sh\n",
 596                    battery->capacity_granularity_1,
 597                    acpi_battery_units(battery));
 598         seq_printf(seq, "capacity granularity 2:  %d %sh\n",
 599                    battery->capacity_granularity_2,
 600                    acpi_battery_units(battery));
 601         seq_printf(seq, "model number:            %s\n", battery->model_number);
 602         seq_printf(seq, "serial number:           %s\n", battery->serial_number);
 603         seq_printf(seq, "battery type:            %s\n", battery->type);
 604         seq_printf(seq, "OEM info:                %s\n", battery->oem_info);
 605       end:
 606         if (result)
 607                 seq_printf(seq, "ERROR: Unable to read battery info\n");
 608         return result;
 609 }
 610
 611 static int acpi_battery_print_state(struct seq_file *seq, int result)
 612 {
 613         struct acpi_battery *battery = seq->private;
 614
 615         if (result)
 616                 goto end;
 617
 618         seq_printf(seq, "present:                 %s\n",
 619                    acpi_battery_present(battery)?"yes":"no");
 620         if (!acpi_battery_present(battery))
 621                 goto end;
 622
 623         seq_printf(seq, "capacity state:          %s\n",
 624                         (battery->state & 0x04)?"critical":"ok");
 625         if ((battery->state & 0x01) && (battery->state & 0x02))
 626                 seq_printf(seq,
 627                            "charging state:          charging/discharging\n");
 628         else if (battery->state & 0x01)
 629                 seq_printf(seq, "charging state:          discharging\n");
 630         else if (battery->state & 0x02)
 631                 seq_printf(seq, "charging state:          charging\n");
 632         else
 633                 seq_printf(seq, "charging state:          charged\n");
 634
 635         if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
 636                 seq_printf(seq, "present rate:            unknown\n");
 637         else
 638                 seq_printf(seq, "present rate:            %d %s\n",
 639                            battery->rate_now, acpi_battery_units(battery));
 640
 641         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
 642                 seq_printf(seq, "remaining capacity:      unknown\n");
 643         else
 644                 seq_printf(seq, "remaining capacity:      %d %sh\n",
 645                            battery->capacity_now, acpi_battery_units(battery));
 646         if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
 647                 seq_printf(seq, "present voltage:         unknown\n");
 648         else
 649                 seq_printf(seq, "present voltage:         %d mV\n",
 650                            battery->voltage_now);
 651       end:
 652         if (result)
 653                 seq_printf(seq, "ERROR: Unable to read battery state\n");
 654
 655         return result;
 656 }
 657
 658 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
 659 {
 660         struct acpi_battery *battery = seq->private;
 661
 662         if (result)
 663                 goto end;
 664
 665         if (!acpi_battery_present(battery)) {
 666                 seq_printf(seq, "present:                 no\n");
 667                 goto end;
 668         }
 669         seq_printf(seq, "alarm:                   ");
 670         if (!battery->alarm)
 671                 seq_printf(seq, "unsupported\n");
 672         else
 673                 seq_printf(seq, "%u %sh\n", battery->alarm,
 674                                 acpi_battery_units(battery));
 675       end:
 676         if (result)
 677                 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
 678         return result;
 679 }
 680
 681 static ssize_t acpi_battery_write_alarm(struct file *file,
 682                                         const char __user * buffer,
 683                                         size_t count, loff_t * ppos)
 684 {
 685         int result = 0;
 686         char alarm_string[12] = { '\0' };
 687         struct seq_file *m = file->private_data;
 688         struct acpi_battery *battery = m->private;
 689
 690         if (!battery || (count > sizeof(alarm_string) - 1))
 691                 return -EINVAL;
 692         if (!acpi_battery_present(battery)) {
 693                 result = -ENODEV;
 694                 goto end;
 695         }
 696         if (copy_from_user(alarm_string, buffer, count)) {
 697                 result = -EFAULT;
 698                 goto end;
 699         }
 700         alarm_string[count] = '\0';
 701         battery->alarm = simple_strtol(alarm_string, NULL, 0);
 702         result = acpi_battery_set_alarm(battery);
 703       end:
 704         if (!result)
 705                 return count;
 706         return result;
 707 }
 708
 709 typedef int(*print_func)(struct seq_file *seq, int result);
 710
 711 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
 712         acpi_battery_print_info,
 713         acpi_battery_print_state,
 714         acpi_battery_print_alarm,
 715 };
 716
 717 static int acpi_battery_read(int fid, struct seq_file *seq)
 718 {
 719         struct acpi_battery *battery = seq->private;
 720         int result = acpi_battery_update(battery);
 721         return acpi_print_funcs[fid](seq, result);
 722 }
 723
 724 #define DECLARE_FILE_FUNCTIONS(_name) \
 725 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
 726 { \
 727         return acpi_battery_read(_name##_tag, seq); \
 728 } \
 729 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
 730 { \
 731         return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
 732 }
 733
 734 DECLARE_FILE_FUNCTIONS(info);
 735 DECLARE_FILE_FUNCTIONS(state);
 736 DECLARE_FILE_FUNCTIONS(alarm);
 737
 738 #undef DECLARE_FILE_FUNCTIONS
 739
 740 #define FILE_DESCRIPTION_RO(_name) \
 741         { \
 742         .name = __stringify(_name), \
 743         .mode = S_IRUGO, \
 744         .ops = { \
 745                 .open = acpi_battery_##_name##_open_fs, \
 746                 .read = seq_read, \
 747                 .llseek = seq_lseek, \
 748                 .release = single_release, \
 749                 .owner = THIS_MODULE, \
 750                 }, \
 751         }
 752
 753 #define FILE_DESCRIPTION_RW(_name) \
 754         { \
 755         .name = __stringify(_name), \
 756         .mode = S_IFREG | S_IRUGO | S_IWUSR, \
 757         .ops = { \
 758                 .open = acpi_battery_##_name##_open_fs, \
 759                 .read = seq_read, \
 760                 .llseek = seq_lseek, \
 761                 .write = acpi_battery_write_##_name, \
 762                 .release = single_release, \
 763                 .owner = THIS_MODULE, \
 764                 }, \
 765         }
 766
 767 static struct battery_file {
 768         struct file_operations ops;
 769         mode_t mode;
 770         const char *name;
 771 } acpi_battery_file[] = {
 772         FILE_DESCRIPTION_RO(info),
 773         FILE_DESCRIPTION_RO(state),
 774         FILE_DESCRIPTION_RW(alarm),
 775 };
 776
 777 #undef FILE_DESCRIPTION_RO
 778 #undef FILE_DESCRIPTION_RW
 779
 780 static int acpi_battery_add_fs(struct acpi_device *device)
 781 {
 782         struct proc_dir_entry *entry = NULL;
 783         int i;
 784
 785         if (!acpi_device_dir(device)) {
 786                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 787                                                      acpi_battery_dir);
 788                 if (!acpi_device_dir(device))
 789                         return -ENODEV;
 790         }
 791
 792         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
 793                 entry = proc_create_data(acpi_battery_file[i].name,
 794                                          acpi_battery_file[i].mode,
 795                                          acpi_device_dir(device),
 796                                          &acpi_battery_file[i].ops,
 797                                          acpi_driver_data(device));
 798                 if (!entry)
 799                         return -ENODEV;
 800         }
 801         return 0;
 802 }
 803
 804 static void acpi_battery_remove_fs(struct acpi_device *device)
 805 {
 806         int i;
 807         if (!acpi_device_dir(device))
 808                 return;
 809         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
 810                 remove_proc_entry(acpi_battery_file[i].name,
 811                                   acpi_device_dir(device));
 812
 813         remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
 814         acpi_device_dir(device) = NULL;
 815 }
 816
 817 #endif
 818
 819 /* --------------------------------------------------------------------------
 820                                  Driver Interface
 821    -------------------------------------------------------------------------- */
 822
 823 static void acpi_battery_notify(struct acpi_device *device, u32 event)
 824 {
 825         struct acpi_battery *battery = acpi_driver_data(device);
 826
 827         if (!battery)
 828                 return;
 829         acpi_battery_update(battery);
 830         acpi_bus_generate_proc_event(device, event,
 831                                      acpi_battery_present(battery));
 832         acpi_bus_generate_netlink_event(device->pnp.device_class,
 833                                         dev_name(&device->dev), event,
 834                                         acpi_battery_present(battery));
 835 #ifdef CONFIG_ACPI_SYSFS_POWER
 836         /* acpi_battery_update could remove power_supply object */
 837         if (battery->bat.dev)
 838                 kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
 839 #endif
 840 }
 841
 842 static int acpi_battery_add(struct acpi_device *device)
 843 {
 844         int result = 0;
 845         struct acpi_battery *battery = NULL;
 846         if (!device)
 847                 return -EINVAL;
 848         battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
 849         if (!battery)
 850                 return -ENOMEM;
 851         battery->device = device;
 852         strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
 853         strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
 854         device->driver_data = battery;
 855         mutex_init(&battery->lock);
 856         acpi_battery_update(battery);
 857 #ifdef CONFIG_ACPI_PROCFS_POWER
 858         result = acpi_battery_add_fs(device);
 859 #endif
 860         if (!result) {
 861                 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
 862                         ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
 863                         device->status.battery_present ? "present" : "absent");
 864         } else {
 865 #ifdef CONFIG_ACPI_PROCFS_POWER
 866                 acpi_battery_remove_fs(device);
 867 #endif
 868                 kfree(battery);
 869         }
 870         return result;
 871 }
 872
 873 static int acpi_battery_remove(struct acpi_device *device, int type)
 874 {
 875         struct acpi_battery *battery = NULL;
 876
 877         if (!device || !acpi_driver_data(device))
 878                 return -EINVAL;
 879         battery = acpi_driver_data(device);
 880 #ifdef CONFIG_ACPI_PROCFS_POWER
 881         acpi_battery_remove_fs(device);
 882 #endif
 883 #ifdef CONFIG_ACPI_SYSFS_POWER
 884         sysfs_remove_battery(battery);
 885 #endif
 886         mutex_destroy(&battery->lock);
 887         kfree(battery);
 888         return 0;
 889 }
 890
 891 /* this is needed to learn about changes made in suspended state */
 892 static int acpi_battery_resume(struct acpi_device *device)
 893 {
 894         struct acpi_battery *battery;
 895         if (!device)
 896                 return -EINVAL;
 897         battery = acpi_driver_data(device);
 898         battery->update_time = 0;
 899         acpi_battery_update(battery);
 900         return 0;
 901 }
 902
 903 static struct acpi_driver acpi_battery_driver = {
 904         .name = "battery",
 905         .class = ACPI_BATTERY_CLASS,
 906         .ids = battery_device_ids,
 907         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
 908         .ops = {
 909                 .add = acpi_battery_add,
 910                 .resume = acpi_battery_resume,
 911                 .remove = acpi_battery_remove,
 912                 .notify = acpi_battery_notify,
 913                 },
 914 };
 915
 916 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
 917 {
 918         if (acpi_disabled)
 919                 return;
 920 #ifdef CONFIG_ACPI_PROCFS_POWER
 921         acpi_battery_dir = acpi_lock_battery_dir();
 922         if (!acpi_battery_dir)
 923                 return;
 924 #endif
 925         if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
 926 #ifdef CONFIG_ACPI_PROCFS_POWER
 927                 acpi_unlock_battery_dir(acpi_battery_dir);
 928 #endif
 929                 return;
 930         }
 931         return;
 932 }
 933
 934 static int __init acpi_battery_init(void)
 935 {
 936         async_schedule(acpi_battery_init_async, NULL);
 937         return 0;
 938 }
 939
 940 static void __exit acpi_battery_exit(void)
 941 {
 942         acpi_bus_unregister_driver(&acpi_battery_driver);
 943 #ifdef CONFIG_ACPI_PROCFS_POWER
 944         acpi_unlock_battery_dir(acpi_battery_dir);
 945 #endif
 946 }
 947
 948 module_init(acpi_battery_init);
 949 module_exit(acpi_battery_exit);