SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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
  35 #ifdef CONFIG_ACPI_PROCFS_POWER
  36 #include <linux/proc_fs.h>
  37 #include <linux/seq_file.h>
  38 #include <asm/uaccess.h>
  39 #endif
  40
  41 #include <acpi/acpi_bus.h>
  42 #include <acpi/acpi_drivers.h>
  43
  44 #ifdef CONFIG_ACPI_SYSFS_POWER
  45 #include <linux/power_supply.h>
  46 #endif
  47
  48 #define PREFIX "ACPI: "
  49
  50 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
  51
  52 #define ACPI_BATTERY_CLASS              "battery"
  53 #define ACPI_BATTERY_DEVICE_NAME        "Battery"
  54 #define ACPI_BATTERY_NOTIFY_STATUS      0x80
  55 #define ACPI_BATTERY_NOTIFY_INFO        0x81
  56
  57 #define _COMPONENT              ACPI_BATTERY_COMPONENT
  58
  59 ACPI_MODULE_NAME("battery");
  60
  61 MODULE_AUTHOR("Paul Diefenbaugh");
  62 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
  63 MODULE_DESCRIPTION("ACPI Battery Driver");
  64 MODULE_LICENSE("GPL");
  65
  66 static unsigned int cache_time = 1000;
  67 module_param(cache_time, uint, 0644);
  68 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  69
  70 #ifdef CONFIG_ACPI_PROCFS_POWER
  71 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
  72 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
  73
  74 enum acpi_battery_files {
  75         info_tag = 0,
  76         state_tag,
  77         alarm_tag,
  78         ACPI_BATTERY_NUMFILES,
  79 };
  80
  81 #endif
  82
  83 static const struct acpi_device_id battery_device_ids[] = {
  84         {"PNP0C0A", 0},
  85         {"", 0},
  86 };
  87
  88 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
  89
  90
  91 struct acpi_battery {
  92         struct mutex lock;
  93 #ifdef CONFIG_ACPI_SYSFS_POWER
  94         struct power_supply bat;
  95 #endif
  96         struct acpi_device *device;
  97         unsigned long update_time;
  98         int rate_now;
  99         int capacity_now;
 100         int voltage_now;
 101         int design_capacity;
 102         int full_charge_capacity;
 103         int technology;
 104         int design_voltage;
 105         int design_capacity_warning;
 106         int design_capacity_low;
 107         int capacity_granularity_1;
 108         int capacity_granularity_2;
 109         int alarm;
 110         char model_number[32];
 111         char serial_number[32];
 112         char type[32];
 113         char oem_info[32];
 114         int state;
 115         int power_unit;
 116         u8 alarm_present;
 117 };
 118
 119 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
 120
 121 inline int acpi_battery_present(struct acpi_battery *battery)
 122 {
 123         return battery->device->status.battery_present;
 124 }
 125
 126 #ifdef CONFIG_ACPI_SYSFS_POWER
 127 static int acpi_battery_technology(struct acpi_battery *battery)
 128 {
 129         if (!strcasecmp("NiCd", battery->type))
 130                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 131         if (!strcasecmp("NiMH", battery->type))
 132                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 133         if (!strcasecmp("LION", battery->type))
 134                 return POWER_SUPPLY_TECHNOLOGY_LION;
 135         if (!strncasecmp("LI-ION", battery->type, 6))
 136                 return POWER_SUPPLY_TECHNOLOGY_LION;
 137         if (!strcasecmp("LiP", battery->type))
 138                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 139         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 140 }
 141
 142 static int acpi_battery_get_state(struct acpi_battery *battery);
 143
 144 static int acpi_battery_is_charged(struct acpi_battery *battery)
 145 {
 146         /* either charging or discharging */
 147         if (battery->state != 0)
 148                 return 0;
 149
 150         /* battery not reporting charge */
 151         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
 152             battery->capacity_now == 0)
 153                 return 0;
 154
 155         /* good batteries update full_charge as the batteries degrade */
 156         if (battery->full_charge_capacity == battery->capacity_now)
 157                 return 1;
 158
 159         /* fallback to using design values for broken batteries */
 160         if (battery->design_capacity == battery->capacity_now)
 161                 return 1;
 162
 163         /* we don't do any sort of metric based on percentages */
 164         return 0;
 165 }
 166
 167 static int acpi_battery_get_property(struct power_supply *psy,
 168                                      enum power_supply_property psp,
 169                                      union power_supply_propval *val)
 170 {
 171         struct acpi_battery *battery = to_acpi_battery(psy);
 172
 173         if (acpi_battery_present(battery)) {
 174                 /* run battery update only if it is present */
 175                 acpi_battery_get_state(battery);
 176         } else if (psp != POWER_SUPPLY_PROP_PRESENT)
 177                 return -ENODEV;
 178         switch (psp) {
 179         case POWER_SUPPLY_PROP_STATUS:
 180                 if (battery->state & 0x01)
 181                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 182                 else if (battery->state & 0x02)
 183                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 184                 else if (acpi_battery_is_charged(battery))
 185                         val->intval = POWER_SUPPLY_STATUS_FULL;
 186                 else
 187                         val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 188                 break;
 189         case POWER_SUPPLY_PROP_PRESENT:
 190                 val->intval = acpi_battery_present(battery);
 191                 break;
 192         case POWER_SUPPLY_PROP_TECHNOLOGY:
 193                 val->intval = acpi_battery_technology(battery);
 194                 break;
 195         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 196                 val->intval = battery->design_voltage * 1000;
 197                 break;
 198         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 199                 val->intval = battery->voltage_now * 1000;
 200                 break;
 201         case POWER_SUPPLY_PROP_CURRENT_NOW:
 202         case POWER_SUPPLY_PROP_POWER_NOW:
 203                 val->intval = battery->rate_now * 1000;
 204                 break;
 205         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 206         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 207                 val->intval = battery->design_capacity * 1000;
 208                 break;
 209         case POWER_SUPPLY_PROP_CHARGE_FULL:
 210         case POWER_SUPPLY_PROP_ENERGY_FULL:
 211                 val->intval = battery->full_charge_capacity * 1000;
 212                 break;
 213         case POWER_SUPPLY_PROP_CHARGE_NOW:
 214         case POWER_SUPPLY_PROP_ENERGY_NOW:
 215                 val->intval = battery->capacity_now * 1000;
 216                 break;
 217         case POWER_SUPPLY_PROP_MODEL_NAME:
 218                 val->strval = battery->model_number;
 219                 break;
 220         case POWER_SUPPLY_PROP_MANUFACTURER:
 221                 val->strval = battery->oem_info;
 222                 break;
 223         case POWER_SUPPLY_PROP_SERIAL_NUMBER:
 224                 val->strval = battery->serial_number;
 225                 break;
 226         default:
 227                 return -EINVAL;
 228         }
 229         return 0;
 230 }
 231
 232 static enum power_supply_property charge_battery_props[] = {
 233         POWER_SUPPLY_PROP_STATUS,
 234         POWER_SUPPLY_PROP_PRESENT,
 235         POWER_SUPPLY_PROP_TECHNOLOGY,
 236         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 237         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 238         POWER_SUPPLY_PROP_CURRENT_NOW,
 239         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 240         POWER_SUPPLY_PROP_CHARGE_FULL,
 241         POWER_SUPPLY_PROP_CHARGE_NOW,
 242         POWER_SUPPLY_PROP_MODEL_NAME,
 243         POWER_SUPPLY_PROP_MANUFACTURER,
 244         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 245 };
 246
 247 static enum power_supply_property energy_battery_props[] = {
 248         POWER_SUPPLY_PROP_STATUS,
 249         POWER_SUPPLY_PROP_PRESENT,
 250         POWER_SUPPLY_PROP_TECHNOLOGY,
 251         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 252         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 253         POWER_SUPPLY_PROP_CURRENT_NOW,
 254         POWER_SUPPLY_PROP_POWER_NOW,
 255         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 256         POWER_SUPPLY_PROP_ENERGY_FULL,
 257         POWER_SUPPLY_PROP_ENERGY_NOW,
 258         POWER_SUPPLY_PROP_MODEL_NAME,
 259         POWER_SUPPLY_PROP_MANUFACTURER,
 260         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 261 };
 262 #endif
 263
 264 #ifdef CONFIG_ACPI_PROCFS_POWER
 265 inline char *acpi_battery_units(struct acpi_battery *battery)
 266 {
 267         return (battery->power_unit)?"mA":"mW";
 268 }
 269 #endif
 270
 271 /* --------------------------------------------------------------------------
 272                                Battery Management
 273    -------------------------------------------------------------------------- */
 274 struct acpi_offsets {
 275         size_t offset;          /* offset inside struct acpi_sbs_battery */
 276         u8 mode;                /* int or string? */
 277 };
 278
 279 static struct acpi_offsets state_offsets[] = {
 280         {offsetof(struct acpi_battery, state), 0},
 281         {offsetof(struct acpi_battery, rate_now), 0},
 282         {offsetof(struct acpi_battery, capacity_now), 0},
 283         {offsetof(struct acpi_battery, voltage_now), 0},
 284 };
 285
 286 static struct acpi_offsets info_offsets[] = {
 287         {offsetof(struct acpi_battery, power_unit), 0},
 288         {offsetof(struct acpi_battery, design_capacity), 0},
 289         {offsetof(struct acpi_battery, full_charge_capacity), 0},
 290         {offsetof(struct acpi_battery, technology), 0},
 291         {offsetof(struct acpi_battery, design_voltage), 0},
 292         {offsetof(struct acpi_battery, design_capacity_warning), 0},
 293         {offsetof(struct acpi_battery, design_capacity_low), 0},
 294         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
 295         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
 296         {offsetof(struct acpi_battery, model_number), 1},
 297         {offsetof(struct acpi_battery, serial_number), 1},
 298         {offsetof(struct acpi_battery, type), 1},
 299         {offsetof(struct acpi_battery, oem_info), 1},
 300 };
 301
 302 static int extract_package(struct acpi_battery *battery,
 303                            union acpi_object *package,
 304                            struct acpi_offsets *offsets, int num)
 305 {
 306         int i;
 307         union acpi_object *element;
 308         if (package->type != ACPI_TYPE_PACKAGE)
 309                 return -EFAULT;
 310         for (i = 0; i < num; ++i) {
 311                 if (package->package.count <= i)
 312                         return -EFAULT;
 313                 element = &package->package.elements[i];
 314                 if (offsets[i].mode) {
 315                         u8 *ptr = (u8 *)battery + offsets[i].offset;
 316                         if (element->type == ACPI_TYPE_STRING ||
 317                             element->type == ACPI_TYPE_BUFFER)
 318                                 strncpy(ptr, element->string.pointer, 32);
 319                         else if (element->type == ACPI_TYPE_INTEGER) {
 320                                 strncpy(ptr, (u8 *)&element->integer.value,
 321                                         sizeof(acpi_integer));
 322                                 ptr[sizeof(acpi_integer)] = 0;
 323                         } else
 324                                 *ptr = 0; /* don't have value */
 325                 } else {
 326                         int *x = (int *)((u8 *)battery + offsets[i].offset);
 327                         *x = (element->type == ACPI_TYPE_INTEGER) ?
 328                                 element->integer.value : -1;
 329                 }
 330         }
 331         return 0;
 332 }
 333
 334 static int acpi_battery_get_status(struct acpi_battery *battery)
 335 {
 336         if (acpi_bus_get_status(battery->device)) {
 337                 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
 338                 return -ENODEV;
 339         }
 340         return 0;
 341 }
 342
 343 static int acpi_battery_get_info(struct acpi_battery *battery)
 344 {
 345         int result = -EFAULT;
 346         acpi_status status = 0;
 347         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 348
 349         if (!acpi_battery_present(battery))
 350                 return 0;
 351         mutex_lock(&battery->lock);
 352         status = acpi_evaluate_object(battery->device->handle, "_BIF",
 353                                       NULL, &buffer);
 354         mutex_unlock(&battery->lock);
 355
 356         if (ACPI_FAILURE(status)) {
 357                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
 358                 return -ENODEV;
 359         }
 360
 361         result = extract_package(battery, buffer.pointer,
 362                                  info_offsets, ARRAY_SIZE(info_offsets));
 363         kfree(buffer.pointer);
 364         return result;
 365 }
 366
 367 static int acpi_battery_get_state(struct acpi_battery *battery)
 368 {
 369         int result = 0;
 370         acpi_status status = 0;
 371         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 372
 373         if (!acpi_battery_present(battery))
 374                 return 0;
 375
 376         if (battery->update_time &&
 377             time_before(jiffies, battery->update_time +
 378                         msecs_to_jiffies(cache_time)))
 379                 return 0;
 380
 381         mutex_lock(&battery->lock);
 382         status = acpi_evaluate_object(battery->device->handle, "_BST",
 383                                       NULL, &buffer);
 384         mutex_unlock(&battery->lock);
 385
 386         if (ACPI_FAILURE(status)) {
 387                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
 388                 return -ENODEV;
 389         }
 390
 391         result = extract_package(battery, buffer.pointer,
 392                                  state_offsets, ARRAY_SIZE(state_offsets));
 393         battery->update_time = jiffies;
 394         kfree(buffer.pointer);
 395         return result;
 396 }
 397
 398 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 399 {
 400         acpi_status status = 0;
 401         union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
 402         struct acpi_object_list arg_list = { 1, &arg0 };
 403
 404         if (!acpi_battery_present(battery)|| !battery->alarm_present)
 405                 return -ENODEV;
 406
 407         arg0.integer.value = battery->alarm;
 408
 409         mutex_lock(&battery->lock);
 410         status = acpi_evaluate_object(battery->device->handle, "_BTP",
 411                                  &arg_list, NULL);
 412         mutex_unlock(&battery->lock);
 413
 414         if (ACPI_FAILURE(status))
 415                 return -ENODEV;
 416
 417         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
 418         return 0;
 419 }
 420
 421 static int acpi_battery_init_alarm(struct acpi_battery *battery)
 422 {
 423         acpi_status status = AE_OK;
 424         acpi_handle handle = NULL;
 425
 426         /* See if alarms are supported, and if so, set default */
 427         status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
 428         if (ACPI_FAILURE(status)) {
 429                 battery->alarm_present = 0;
 430                 return 0;
 431         }
 432         battery->alarm_present = 1;
 433         if (!battery->alarm)
 434                 battery->alarm = battery->design_capacity_warning;
 435         return acpi_battery_set_alarm(battery);
 436 }
 437
 438 #ifdef CONFIG_ACPI_SYSFS_POWER
 439 static ssize_t acpi_battery_alarm_show(struct device *dev,
 440                                         struct device_attribute *attr,
 441                                         char *buf)
 442 {
 443         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 444         return sprintf(buf, "%d\n", battery->alarm * 1000);
 445 }
 446
 447 static ssize_t acpi_battery_alarm_store(struct device *dev,
 448                                         struct device_attribute *attr,
 449                                         const char *buf, size_t count)
 450 {
 451         unsigned long x;
 452         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 453         if (sscanf(buf, "%ld\n", &x) == 1)
 454                 battery->alarm = x/1000;
 455         if (acpi_battery_present(battery))
 456                 acpi_battery_set_alarm(battery);
 457         return count;
 458 }
 459
 460 static struct device_attribute alarm_attr = {
 461         .attr = {.name = "alarm", .mode = 0644},
 462         .show = acpi_battery_alarm_show,
 463         .store = acpi_battery_alarm_store,
 464 };
 465
 466 static int sysfs_add_battery(struct acpi_battery *battery)
 467 {
 468         int result;
 469
 470         if (battery->power_unit) {
 471                 battery->bat.properties = charge_battery_props;
 472                 battery->bat.num_properties =
 473                         ARRAY_SIZE(charge_battery_props);
 474         } else {
 475                 battery->bat.properties = energy_battery_props;
 476                 battery->bat.num_properties =
 477                         ARRAY_SIZE(energy_battery_props);
 478         }
 479
 480         battery->bat.name = acpi_device_bid(battery->device);
 481         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 482         battery->bat.get_property = acpi_battery_get_property;
 483
 484         result = power_supply_register(&battery->device->dev, &battery->bat);
 485         if (result)
 486                 return result;
 487         return device_create_file(battery->bat.dev, &alarm_attr);
 488 }
 489
 490 static void sysfs_remove_battery(struct acpi_battery *battery)
 491 {
 492         if (!battery->bat.dev)
 493                 return;
 494         device_remove_file(battery->bat.dev, &alarm_attr);
 495         power_supply_unregister(&battery->bat);
 496         battery->bat.dev = NULL;
 497 }
 498 #endif
 499
 500 static int acpi_battery_update(struct acpi_battery *battery)
 501 {
 502         int result, old_present = acpi_battery_present(battery);
 503         result = acpi_battery_get_status(battery);
 504         if (result)
 505                 return result;
 506 #ifdef CONFIG_ACPI_SYSFS_POWER
 507         if (!acpi_battery_present(battery)) {
 508                 sysfs_remove_battery(battery);
 509                 battery->update_time = 0;
 510                 return 0;
 511         }
 512 #endif
 513         if (!battery->update_time ||
 514             old_present != acpi_battery_present(battery)) {
 515                 result = acpi_battery_get_info(battery);
 516                 if (result)
 517                         return result;
 518                 acpi_battery_init_alarm(battery);
 519         }
 520 #ifdef CONFIG_ACPI_SYSFS_POWER
 521         if (!battery->bat.dev)
 522                 sysfs_add_battery(battery);
 523 #endif
 524         return acpi_battery_get_state(battery);
 525 }
 526
 527 /* --------------------------------------------------------------------------
 528                               FS Interface (/proc)
 529    -------------------------------------------------------------------------- */
 530
 531 #ifdef CONFIG_ACPI_PROCFS_POWER
 532 static struct proc_dir_entry *acpi_battery_dir;
 533
 534 static int acpi_battery_print_info(struct seq_file *seq, int result)
 535 {
 536         struct acpi_battery *battery = seq->private;
 537
 538         if (result)
 539                 goto end;
 540
 541         seq_printf(seq, "present:                 %s\n",
 542                    acpi_battery_present(battery)?"yes":"no");
 543         if (!acpi_battery_present(battery))
 544                 goto end;
 545         if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 546                 seq_printf(seq, "design capacity:         unknown\n");
 547         else
 548                 seq_printf(seq, "design capacity:         %d %sh\n",
 549                            battery->design_capacity,
 550                            acpi_battery_units(battery));
 551
 552         if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 553                 seq_printf(seq, "last full capacity:      unknown\n");
 554         else
 555                 seq_printf(seq, "last full capacity:      %d %sh\n",
 556                            battery->full_charge_capacity,
 557                            acpi_battery_units(battery));
 558
 559         seq_printf(seq, "battery technology:      %srechargeable\n",
 560                    (!battery->technology)?"non-":"");
 561
 562         if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 563                 seq_printf(seq, "design voltage:          unknown\n");
 564         else
 565                 seq_printf(seq, "design voltage:          %d mV\n",
 566                            battery->design_voltage);
 567         seq_printf(seq, "design capacity warning: %d %sh\n",
 568                    battery->design_capacity_warning,
 569                    acpi_battery_units(battery));
 570         seq_printf(seq, "design capacity low:     %d %sh\n",
 571                    battery->design_capacity_low,
 572                    acpi_battery_units(battery));
 573         seq_printf(seq, "capacity granularity 1:  %d %sh\n",
 574                    battery->capacity_granularity_1,
 575                    acpi_battery_units(battery));
 576         seq_printf(seq, "capacity granularity 2:  %d %sh\n",
 577                    battery->capacity_granularity_2,
 578                    acpi_battery_units(battery));
 579         seq_printf(seq, "model number:            %s\n", battery->model_number);
 580         seq_printf(seq, "serial number:           %s\n", battery->serial_number);
 581         seq_printf(seq, "battery type:            %s\n", battery->type);
 582         seq_printf(seq, "OEM info:                %s\n", battery->oem_info);
 583       end:
 584         if (result)
 585                 seq_printf(seq, "ERROR: Unable to read battery info\n");
 586         return result;
 587 }
 588
 589 static int acpi_battery_print_state(struct seq_file *seq, int result)
 590 {
 591         struct acpi_battery *battery = seq->private;
 592
 593         if (result)
 594                 goto end;
 595
 596         seq_printf(seq, "present:                 %s\n",
 597                    acpi_battery_present(battery)?"yes":"no");
 598         if (!acpi_battery_present(battery))
 599                 goto end;
 600
 601         seq_printf(seq, "capacity state:          %s\n",
 602                         (battery->state & 0x04)?"critical":"ok");
 603         if ((battery->state & 0x01) && (battery->state & 0x02))
 604                 seq_printf(seq,
 605                            "charging state:          charging/discharging\n");
 606         else if (battery->state & 0x01)
 607                 seq_printf(seq, "charging state:          discharging\n");
 608         else if (battery->state & 0x02)
 609                 seq_printf(seq, "charging state:          charging\n");
 610         else
 611                 seq_printf(seq, "charging state:          charged\n");
 612
 613         if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
 614                 seq_printf(seq, "present rate:            unknown\n");
 615         else
 616                 seq_printf(seq, "present rate:            %d %s\n",
 617                            battery->rate_now, acpi_battery_units(battery));
 618
 619         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
 620                 seq_printf(seq, "remaining capacity:      unknown\n");
 621         else
 622                 seq_printf(seq, "remaining capacity:      %d %sh\n",
 623                            battery->capacity_now, acpi_battery_units(battery));
 624         if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
 625                 seq_printf(seq, "present voltage:         unknown\n");
 626         else
 627                 seq_printf(seq, "present voltage:         %d mV\n",
 628                            battery->voltage_now);
 629       end:
 630         if (result)
 631                 seq_printf(seq, "ERROR: Unable to read battery state\n");
 632
 633         return result;
 634 }
 635
 636 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
 637 {
 638         struct acpi_battery *battery = seq->private;
 639
 640         if (result)
 641                 goto end;
 642
 643         if (!acpi_battery_present(battery)) {
 644                 seq_printf(seq, "present:                 no\n");
 645                 goto end;
 646         }
 647         seq_printf(seq, "alarm:                   ");
 648         if (!battery->alarm)
 649                 seq_printf(seq, "unsupported\n");
 650         else
 651                 seq_printf(seq, "%u %sh\n", battery->alarm,
 652                                 acpi_battery_units(battery));
 653       end:
 654         if (result)
 655                 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
 656         return result;
 657 }
 658
 659 static ssize_t acpi_battery_write_alarm(struct file *file,
 660                                         const char __user * buffer,
 661                                         size_t count, loff_t * ppos)
 662 {
 663         int result = 0;
 664         char alarm_string[12] = { '\0' };
 665         struct seq_file *m = file->private_data;
 666         struct acpi_battery *battery = m->private;
 667
 668         if (!battery || (count > sizeof(alarm_string) - 1))
 669                 return -EINVAL;
 670         if (!acpi_battery_present(battery)) {
 671                 result = -ENODEV;
 672                 goto end;
 673         }
 674         if (copy_from_user(alarm_string, buffer, count)) {
 675                 result = -EFAULT;
 676                 goto end;
 677         }
 678         alarm_string[count] = '\0';
 679         battery->alarm = simple_strtol(alarm_string, NULL, 0);
 680         result = acpi_battery_set_alarm(battery);
 681       end:
 682         if (!result)
 683                 return count;
 684         return result;
 685 }
 686
 687 typedef int(*print_func)(struct seq_file *seq, int result);
 688
 689 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
 690         acpi_battery_print_info,
 691         acpi_battery_print_state,
 692         acpi_battery_print_alarm,
 693 };
 694
 695 static int acpi_battery_read(int fid, struct seq_file *seq)
 696 {
 697         struct acpi_battery *battery = seq->private;
 698         int result = acpi_battery_update(battery);
 699         return acpi_print_funcs[fid](seq, result);
 700 }
 701
 702 #define DECLARE_FILE_FUNCTIONS(_name) \
 703 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
 704 { \
 705         return acpi_battery_read(_name##_tag, seq); \
 706 } \
 707 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
 708 { \
 709         return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
 710 }
 711
 712 DECLARE_FILE_FUNCTIONS(info);
 713 DECLARE_FILE_FUNCTIONS(state);
 714 DECLARE_FILE_FUNCTIONS(alarm);
 715
 716 #undef DECLARE_FILE_FUNCTIONS
 717
 718 #define FILE_DESCRIPTION_RO(_name) \
 719         { \
 720         .name = __stringify(_name), \
 721         .mode = S_IRUGO, \
 722         .ops = { \
 723                 .open = acpi_battery_##_name##_open_fs, \
 724                 .read = seq_read, \
 725                 .llseek = seq_lseek, \
 726                 .release = single_release, \
 727                 .owner = THIS_MODULE, \
 728                 }, \
 729         }
 730
 731 #define FILE_DESCRIPTION_RW(_name) \
 732         { \
 733         .name = __stringify(_name), \
 734         .mode = S_IFREG | S_IRUGO | S_IWUSR, \
 735         .ops = { \
 736                 .open = acpi_battery_##_name##_open_fs, \
 737                 .read = seq_read, \
 738                 .llseek = seq_lseek, \
 739                 .write = acpi_battery_write_##_name, \
 740                 .release = single_release, \
 741                 .owner = THIS_MODULE, \
 742                 }, \
 743         }
 744
 745 static struct battery_file {
 746         struct file_operations ops;
 747         mode_t mode;
 748         const char *name;
 749 } acpi_battery_file[] = {
 750         FILE_DESCRIPTION_RO(info),
 751         FILE_DESCRIPTION_RO(state),
 752         FILE_DESCRIPTION_RW(alarm),
 753 };
 754
 755 #undef FILE_DESCRIPTION_RO
 756 #undef FILE_DESCRIPTION_RW
 757
 758 static int acpi_battery_add_fs(struct acpi_device *device)
 759 {
 760         struct proc_dir_entry *entry = NULL;
 761         int i;
 762
 763         if (!acpi_device_dir(device)) {
 764                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 765                                                      acpi_battery_dir);
 766                 if (!acpi_device_dir(device))
 767                         return -ENODEV;
 768         }
 769
 770         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
 771                 entry = proc_create_data(acpi_battery_file[i].name,
 772                                          acpi_battery_file[i].mode,
 773                                          acpi_device_dir(device),
 774                                          &acpi_battery_file[i].ops,
 775                                          acpi_driver_data(device));
 776                 if (!entry)
 777                         return -ENODEV;
 778         }
 779         return 0;
 780 }
 781
 782 static void acpi_battery_remove_fs(struct acpi_device *device)
 783 {
 784         int i;
 785         if (!acpi_device_dir(device))
 786                 return;
 787         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
 788                 remove_proc_entry(acpi_battery_file[i].name,
 789                                   acpi_device_dir(device));
 790
 791         remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
 792         acpi_device_dir(device) = NULL;
 793 }
 794
 795 #endif
 796
 797 /* --------------------------------------------------------------------------
 798                                  Driver Interface
 799    -------------------------------------------------------------------------- */
 800
 801 static void acpi_battery_notify(struct acpi_device *device, u32 event)
 802 {
 803         struct acpi_battery *battery = acpi_driver_data(device);
 804
 805         if (!battery)
 806                 return;
 807         acpi_battery_update(battery);
 808         acpi_bus_generate_proc_event(device, event,
 809                                      acpi_battery_present(battery));
 810         acpi_bus_generate_netlink_event(device->pnp.device_class,
 811                                         dev_name(&device->dev), event,
 812                                         acpi_battery_present(battery));
 813 #ifdef CONFIG_ACPI_SYSFS_POWER
 814         /* acpi_batter_update could remove power_supply object */
 815         if (battery->bat.dev)
 816                 kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
 817 #endif
 818 }
 819
 820 static int acpi_battery_add(struct acpi_device *device)
 821 {
 822         int result = 0;
 823         struct acpi_battery *battery = NULL;
 824         if (!device)
 825                 return -EINVAL;
 826         battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
 827         if (!battery)
 828                 return -ENOMEM;
 829         battery->device = device;
 830         strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
 831         strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
 832         device->driver_data = battery;
 833         mutex_init(&battery->lock);
 834         acpi_battery_update(battery);
 835 #ifdef CONFIG_ACPI_PROCFS_POWER
 836         result = acpi_battery_add_fs(device);
 837 #endif
 838         if (!result) {
 839                 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
 840                         ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
 841                         device->status.battery_present ? "present" : "absent");
 842         } else {
 843 #ifdef CONFIG_ACPI_PROCFS_POWER
 844                 acpi_battery_remove_fs(device);
 845 #endif
 846                 kfree(battery);
 847         }
 848         return result;
 849 }
 850
 851 static int acpi_battery_remove(struct acpi_device *device, int type)
 852 {
 853         struct acpi_battery *battery = NULL;
 854
 855         if (!device || !acpi_driver_data(device))
 856                 return -EINVAL;
 857         battery = acpi_driver_data(device);
 858 #ifdef CONFIG_ACPI_PROCFS_POWER
 859         acpi_battery_remove_fs(device);
 860 #endif
 861 #ifdef CONFIG_ACPI_SYSFS_POWER
 862         sysfs_remove_battery(battery);
 863 #endif
 864         mutex_destroy(&battery->lock);
 865         kfree(battery);
 866         return 0;
 867 }
 868
 869 /* this is needed to learn about changes made in suspended state */
 870 static int acpi_battery_resume(struct acpi_device *device)
 871 {
 872         struct acpi_battery *battery;
 873         if (!device)
 874                 return -EINVAL;
 875         battery = acpi_driver_data(device);
 876         battery->update_time = 0;
 877         acpi_battery_update(battery);
 878         return 0;
 879 }
 880
 881 static struct acpi_driver acpi_battery_driver = {
 882         .name = "battery",
 883         .class = ACPI_BATTERY_CLASS,
 884         .ids = battery_device_ids,
 885         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
 886         .ops = {
 887                 .add = acpi_battery_add,
 888                 .resume = acpi_battery_resume,
 889                 .remove = acpi_battery_remove,
 890                 .notify = acpi_battery_notify,
 891                 },
 892 };
 893
 894 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
 895 {
 896         if (acpi_disabled)
 897                 return;
 898 #ifdef CONFIG_ACPI_PROCFS_POWER
 899         acpi_battery_dir = acpi_lock_battery_dir();
 900         if (!acpi_battery_dir)
 901                 return;
 902 #endif
 903         if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
 904 #ifdef CONFIG_ACPI_PROCFS_POWER
 905                 acpi_unlock_battery_dir(acpi_battery_dir);
 906 #endif
 907                 return;
 908         }
 909         return;
 910 }
 911
 912 static int __init acpi_battery_init(void)
 913 {
 914         async_schedule(acpi_battery_init_async, NULL);
 915         return 0;
 916 }
 917
 918 static void __exit acpi_battery_exit(void)
 919 {
 920         acpi_bus_unregister_driver(&acpi_battery_driver);
 921 #ifdef CONFIG_ACPI_PROCFS_POWER
 922         acpi_unlock_battery_dir(acpi_battery_dir);
 923 #endif
 924 }
 925
 926 module_init(acpi_battery_init);
 927 module_exit(acpi_battery_exit);