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   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
  34 #ifdef CONFIG_ACPI_PROCFS_POWER
  35 #include <linux/proc_fs.h>
  36 #include <linux/seq_file.h>
  37 #include <asm/uaccess.h>
  38 #endif
  39
  40 #include <acpi/acpi_bus.h>
  41 #include <acpi/acpi_drivers.h>
  42
  43 #ifdef CONFIG_ACPI_SYSFS_POWER
  44 #include <linux/power_supply.h>
  45 #endif
  46
  47 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
  48
  49 #define ACPI_BATTERY_CLASS              "battery"
  50 #define ACPI_BATTERY_DEVICE_NAME        "Battery"
  51 #define ACPI_BATTERY_NOTIFY_STATUS      0x80
  52 #define ACPI_BATTERY_NOTIFY_INFO        0x81
  53
  54 #define _COMPONENT              ACPI_BATTERY_COMPONENT
  55
  56 ACPI_MODULE_NAME("battery");
  57
  58 MODULE_AUTHOR("Paul Diefenbaugh");
  59 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
  60 MODULE_DESCRIPTION("ACPI Battery Driver");
  61 MODULE_LICENSE("GPL");
  62
  63 static unsigned int cache_time = 1000;
  64 module_param(cache_time, uint, 0644);
  65 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  66
  67 #ifdef CONFIG_ACPI_PROCFS_POWER
  68 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
  69 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
  70
  71 enum acpi_battery_files {
  72         info_tag = 0,
  73         state_tag,
  74         alarm_tag,
  75         ACPI_BATTERY_NUMFILES,
  76 };
  77
  78 #endif
  79
  80 static const struct acpi_device_id battery_device_ids[] = {
  81         {"PNP0C0A", 0},
  82         {"", 0},
  83 };
  84
  85 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
  86
  87
  88 struct acpi_battery {
  89         struct mutex lock;
  90 #ifdef CONFIG_ACPI_SYSFS_POWER
  91         struct power_supply bat;
  92 #endif
  93         struct acpi_device *device;
  94         unsigned long update_time;
  95         int current_now;
  96         int capacity_now;
  97         int voltage_now;
  98         int design_capacity;
  99         int full_charge_capacity;
 100         int technology;
 101         int design_voltage;
 102         int design_capacity_warning;
 103         int design_capacity_low;
 104         int capacity_granularity_1;
 105         int capacity_granularity_2;
 106         int alarm;
 107         char model_number[32];
 108         char serial_number[32];
 109         char type[32];
 110         char oem_info[32];
 111         int state;
 112         int power_unit;
 113         u8 alarm_present;
 114 };
 115
 116 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
 117
 118 inline int acpi_battery_present(struct acpi_battery *battery)
 119 {
 120         return battery->device->status.battery_present;
 121 }
 122
 123 #ifdef CONFIG_ACPI_SYSFS_POWER
 124 static int acpi_battery_technology(struct acpi_battery *battery)
 125 {
 126         if (!strcasecmp("NiCd", battery->type))
 127                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 128         if (!strcasecmp("NiMH", battery->type))
 129                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 130         if (!strcasecmp("LION", battery->type))
 131                 return POWER_SUPPLY_TECHNOLOGY_LION;
 132         if (!strncasecmp("LI-ION", battery->type, 6))
 133                 return POWER_SUPPLY_TECHNOLOGY_LION;
 134         if (!strcasecmp("LiP", battery->type))
 135                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 136         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 137 }
 138
 139 static int acpi_battery_get_state(struct acpi_battery *battery);
 140
 141 static int acpi_battery_is_charged(struct acpi_battery *battery)
 142 {
 143         /* either charging or discharging */
 144         if (battery->state != 0)
 145                 return 0;
 146
 147         /* battery not reporting charge */
 148         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
 149             battery->capacity_now == 0)
 150                 return 0;
 151
 152         /* good batteries update full_charge as the batteries degrade */
 153         if (battery->full_charge_capacity == battery->capacity_now)
 154                 return 1;
 155
 156         /* fallback to using design values for broken batteries */
 157         if (battery->design_capacity == battery->capacity_now)
 158                 return 1;
 159
 160         /* we don't do any sort of metric based on percentages */
 161         return 0;
 162 }
 163
 164 static int acpi_battery_get_property(struct power_supply *psy,
 165                                      enum power_supply_property psp,
 166                                      union power_supply_propval *val)
 167 {
 168         struct acpi_battery *battery = to_acpi_battery(psy);
 169
 170         if (acpi_battery_present(battery)) {
 171                 /* run battery update only if it is present */
 172                 acpi_battery_get_state(battery);
 173         } else if (psp != POWER_SUPPLY_PROP_PRESENT)
 174                 return -ENODEV;
 175         switch (psp) {
 176         case POWER_SUPPLY_PROP_STATUS:
 177                 if (battery->state & 0x01)
 178                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 179                 else if (battery->state & 0x02)
 180                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 181                 else if (acpi_battery_is_charged(battery))
 182                         val->intval = POWER_SUPPLY_STATUS_FULL;
 183                 else
 184                         val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 185                 break;
 186         case POWER_SUPPLY_PROP_PRESENT:
 187                 val->intval = acpi_battery_present(battery);
 188                 break;
 189         case POWER_SUPPLY_PROP_TECHNOLOGY:
 190                 val->intval = acpi_battery_technology(battery);
 191                 break;
 192         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 193                 val->intval = battery->design_voltage * 1000;
 194                 break;
 195         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 196                 val->intval = battery->voltage_now * 1000;
 197                 break;
 198         case POWER_SUPPLY_PROP_CURRENT_NOW:
 199                 val->intval = battery->current_now * 1000;
 200                 break;
 201         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 202         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 203                 val->intval = battery->design_capacity * 1000;
 204                 break;
 205         case POWER_SUPPLY_PROP_CHARGE_FULL:
 206         case POWER_SUPPLY_PROP_ENERGY_FULL:
 207                 val->intval = battery->full_charge_capacity * 1000;
 208                 break;
 209         case POWER_SUPPLY_PROP_CHARGE_NOW:
 210         case POWER_SUPPLY_PROP_ENERGY_NOW:
 211                 val->intval = battery->capacity_now * 1000;
 212                 break;
 213         case POWER_SUPPLY_PROP_MODEL_NAME:
 214                 val->strval = battery->model_number;
 215                 break;
 216         case POWER_SUPPLY_PROP_MANUFACTURER:
 217                 val->strval = battery->oem_info;
 218                 break;
 219         case POWER_SUPPLY_PROP_SERIAL_NUMBER:
 220                 val->strval = battery->serial_number;
 221                 break;
 222         default:
 223                 return -EINVAL;
 224         }
 225         return 0;
 226 }
 227
 228 static enum power_supply_property charge_battery_props[] = {
 229         POWER_SUPPLY_PROP_STATUS,
 230         POWER_SUPPLY_PROP_PRESENT,
 231         POWER_SUPPLY_PROP_TECHNOLOGY,
 232         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 233         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 234         POWER_SUPPLY_PROP_CURRENT_NOW,
 235         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 236         POWER_SUPPLY_PROP_CHARGE_FULL,
 237         POWER_SUPPLY_PROP_CHARGE_NOW,
 238         POWER_SUPPLY_PROP_MODEL_NAME,
 239         POWER_SUPPLY_PROP_MANUFACTURER,
 240         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 241 };
 242
 243 static enum power_supply_property energy_battery_props[] = {
 244         POWER_SUPPLY_PROP_STATUS,
 245         POWER_SUPPLY_PROP_PRESENT,
 246         POWER_SUPPLY_PROP_TECHNOLOGY,
 247         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 248         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 249         POWER_SUPPLY_PROP_CURRENT_NOW,
 250         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 251         POWER_SUPPLY_PROP_ENERGY_FULL,
 252         POWER_SUPPLY_PROP_ENERGY_NOW,
 253         POWER_SUPPLY_PROP_MODEL_NAME,
 254         POWER_SUPPLY_PROP_MANUFACTURER,
 255         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 256 };
 257 #endif
 258
 259 #ifdef CONFIG_ACPI_PROCFS_POWER
 260 inline char *acpi_battery_units(struct acpi_battery *battery)
 261 {
 262         return (battery->power_unit)?"mA":"mW";
 263 }
 264 #endif
 265
 266 /* --------------------------------------------------------------------------
 267                                Battery Management
 268    -------------------------------------------------------------------------- */
 269 struct acpi_offsets {
 270         size_t offset;          /* offset inside struct acpi_sbs_battery */
 271         u8 mode;                /* int or string? */
 272 };
 273
 274 static struct acpi_offsets state_offsets[] = {
 275         {offsetof(struct acpi_battery, state), 0},
 276         {offsetof(struct acpi_battery, current_now), 0},
 277         {offsetof(struct acpi_battery, capacity_now), 0},
 278         {offsetof(struct acpi_battery, voltage_now), 0},
 279 };
 280
 281 static struct acpi_offsets info_offsets[] = {
 282         {offsetof(struct acpi_battery, power_unit), 0},
 283         {offsetof(struct acpi_battery, design_capacity), 0},
 284         {offsetof(struct acpi_battery, full_charge_capacity), 0},
 285         {offsetof(struct acpi_battery, technology), 0},
 286         {offsetof(struct acpi_battery, design_voltage), 0},
 287         {offsetof(struct acpi_battery, design_capacity_warning), 0},
 288         {offsetof(struct acpi_battery, design_capacity_low), 0},
 289         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
 290         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
 291         {offsetof(struct acpi_battery, model_number), 1},
 292         {offsetof(struct acpi_battery, serial_number), 1},
 293         {offsetof(struct acpi_battery, type), 1},
 294         {offsetof(struct acpi_battery, oem_info), 1},
 295 };
 296
 297 static int extract_package(struct acpi_battery *battery,
 298                            union acpi_object *package,
 299                            struct acpi_offsets *offsets, int num)
 300 {
 301         int i;
 302         union acpi_object *element;
 303         if (package->type != ACPI_TYPE_PACKAGE)
 304                 return -EFAULT;
 305         for (i = 0; i < num; ++i) {
 306                 if (package->package.count <= i)
 307                         return -EFAULT;
 308                 element = &package->package.elements[i];
 309                 if (offsets[i].mode) {
 310                         u8 *ptr = (u8 *)battery + offsets[i].offset;
 311                         if (element->type == ACPI_TYPE_STRING ||
 312                             element->type == ACPI_TYPE_BUFFER)
 313                                 strncpy(ptr, element->string.pointer, 32);
 314                         else if (element->type == ACPI_TYPE_INTEGER) {
 315                                 strncpy(ptr, (u8 *)&element->integer.value,
 316                                         sizeof(acpi_integer));
 317                                 ptr[sizeof(acpi_integer)] = 0;
 318                         } else
 319                                 *ptr = 0; /* don't have value */
 320                 } else {
 321                         int *x = (int *)((u8 *)battery + offsets[i].offset);
 322                         *x = (element->type == ACPI_TYPE_INTEGER) ?
 323                                 element->integer.value : -1;
 324                 }
 325         }
 326         return 0;
 327 }
 328
 329 static int acpi_battery_get_status(struct acpi_battery *battery)
 330 {
 331         if (acpi_bus_get_status(battery->device)) {
 332                 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
 333                 return -ENODEV;
 334         }
 335         return 0;
 336 }
 337
 338 static int acpi_battery_get_info(struct acpi_battery *battery)
 339 {
 340         int result = -EFAULT;
 341         acpi_status status = 0;
 342         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 343
 344         if (!acpi_battery_present(battery))
 345                 return 0;
 346         mutex_lock(&battery->lock);
 347         status = acpi_evaluate_object(battery->device->handle, "_BIF",
 348                                       NULL, &buffer);
 349         mutex_unlock(&battery->lock);
 350
 351         if (ACPI_FAILURE(status)) {
 352                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
 353                 return -ENODEV;
 354         }
 355
 356         result = extract_package(battery, buffer.pointer,
 357                                  info_offsets, ARRAY_SIZE(info_offsets));
 358         kfree(buffer.pointer);
 359         return result;
 360 }
 361
 362 static int acpi_battery_get_state(struct acpi_battery *battery)
 363 {
 364         int result = 0;
 365         acpi_status status = 0;
 366         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 367
 368         if (!acpi_battery_present(battery))
 369                 return 0;
 370
 371         if (battery->update_time &&
 372             time_before(jiffies, battery->update_time +
 373                         msecs_to_jiffies(cache_time)))
 374                 return 0;
 375
 376         mutex_lock(&battery->lock);
 377         status = acpi_evaluate_object(battery->device->handle, "_BST",
 378                                       NULL, &buffer);
 379         mutex_unlock(&battery->lock);
 380
 381         if (ACPI_FAILURE(status)) {
 382                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
 383                 return -ENODEV;
 384         }
 385
 386         result = extract_package(battery, buffer.pointer,
 387                                  state_offsets, ARRAY_SIZE(state_offsets));
 388         battery->update_time = jiffies;
 389         kfree(buffer.pointer);
 390         return result;
 391 }
 392
 393 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 394 {
 395         acpi_status status = 0;
 396         union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
 397         struct acpi_object_list arg_list = { 1, &arg0 };
 398
 399         if (!acpi_battery_present(battery)|| !battery->alarm_present)
 400                 return -ENODEV;
 401
 402         arg0.integer.value = battery->alarm;
 403
 404         mutex_lock(&battery->lock);
 405         status = acpi_evaluate_object(battery->device->handle, "_BTP",
 406                                  &arg_list, NULL);
 407         mutex_unlock(&battery->lock);
 408
 409         if (ACPI_FAILURE(status))
 410                 return -ENODEV;
 411
 412         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
 413         return 0;
 414 }
 415
 416 static int acpi_battery_init_alarm(struct acpi_battery *battery)
 417 {
 418         acpi_status status = AE_OK;
 419         acpi_handle handle = NULL;
 420
 421         /* See if alarms are supported, and if so, set default */
 422         status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
 423         if (ACPI_FAILURE(status)) {
 424                 battery->alarm_present = 0;
 425                 return 0;
 426         }
 427         battery->alarm_present = 1;
 428         if (!battery->alarm)
 429                 battery->alarm = battery->design_capacity_warning;
 430         return acpi_battery_set_alarm(battery);
 431 }
 432
 433 #ifdef CONFIG_ACPI_SYSFS_POWER
 434 static ssize_t acpi_battery_alarm_show(struct device *dev,
 435                                         struct device_attribute *attr,
 436                                         char *buf)
 437 {
 438         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 439         return sprintf(buf, "%d\n", battery->alarm * 1000);
 440 }
 441
 442 static ssize_t acpi_battery_alarm_store(struct device *dev,
 443                                         struct device_attribute *attr,
 444                                         const char *buf, size_t count)
 445 {
 446         unsigned long x;
 447         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 448         if (sscanf(buf, "%ld\n", &x) == 1)
 449                 battery->alarm = x/1000;
 450         if (acpi_battery_present(battery))
 451                 acpi_battery_set_alarm(battery);
 452         return count;
 453 }
 454
 455 static struct device_attribute alarm_attr = {
 456         .attr = {.name = "alarm", .mode = 0644},
 457         .show = acpi_battery_alarm_show,
 458         .store = acpi_battery_alarm_store,
 459 };
 460
 461 static int sysfs_add_battery(struct acpi_battery *battery)
 462 {
 463         int result;
 464
 465         if (battery->power_unit) {
 466                 battery->bat.properties = charge_battery_props;
 467                 battery->bat.num_properties =
 468                         ARRAY_SIZE(charge_battery_props);
 469         } else {
 470                 battery->bat.properties = energy_battery_props;
 471                 battery->bat.num_properties =
 472                         ARRAY_SIZE(energy_battery_props);
 473         }
 474
 475         battery->bat.name = acpi_device_bid(battery->device);
 476         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 477         battery->bat.get_property = acpi_battery_get_property;
 478
 479         result = power_supply_register(&battery->device->dev, &battery->bat);
 480         if (result)
 481                 return result;
 482         return device_create_file(battery->bat.dev, &alarm_attr);
 483 }
 484
 485 static void sysfs_remove_battery(struct acpi_battery *battery)
 486 {
 487         if (!battery->bat.dev)
 488                 return;
 489         device_remove_file(battery->bat.dev, &alarm_attr);
 490         power_supply_unregister(&battery->bat);
 491         battery->bat.dev = NULL;
 492 }
 493 #endif
 494
 495 static int acpi_battery_update(struct acpi_battery *battery)
 496 {
 497         int result, old_present = acpi_battery_present(battery);
 498         result = acpi_battery_get_status(battery);
 499         if (result)
 500                 return result;
 501 #ifdef CONFIG_ACPI_SYSFS_POWER
 502         if (!acpi_battery_present(battery)) {
 503                 sysfs_remove_battery(battery);
 504                 battery->update_time = 0;
 505                 return 0;
 506         }
 507 #endif
 508         if (!battery->update_time ||
 509             old_present != acpi_battery_present(battery)) {
 510                 result = acpi_battery_get_info(battery);
 511                 if (result)
 512                         return result;
 513                 acpi_battery_init_alarm(battery);
 514         }
 515 #ifdef CONFIG_ACPI_SYSFS_POWER
 516         if (!battery->bat.dev)
 517                 sysfs_add_battery(battery);
 518 #endif
 519         return acpi_battery_get_state(battery);
 520 }
 521
 522 /* --------------------------------------------------------------------------
 523                               FS Interface (/proc)
 524    -------------------------------------------------------------------------- */
 525
 526 #ifdef CONFIG_ACPI_PROCFS_POWER
 527 static struct proc_dir_entry *acpi_battery_dir;
 528
 529 static int acpi_battery_print_info(struct seq_file *seq, int result)
 530 {
 531         struct acpi_battery *battery = seq->private;
 532
 533         if (result)
 534                 goto end;
 535
 536         seq_printf(seq, "present:                 %s\n",
 537                    acpi_battery_present(battery)?"yes":"no");
 538         if (!acpi_battery_present(battery))
 539                 goto end;
 540         if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 541                 seq_printf(seq, "design capacity:         unknown\n");
 542         else
 543                 seq_printf(seq, "design capacity:         %d %sh\n",
 544                            battery->design_capacity,
 545                            acpi_battery_units(battery));
 546
 547         if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 548                 seq_printf(seq, "last full capacity:      unknown\n");
 549         else
 550                 seq_printf(seq, "last full capacity:      %d %sh\n",
 551                            battery->full_charge_capacity,
 552                            acpi_battery_units(battery));
 553
 554         seq_printf(seq, "battery technology:      %srechargeable\n",
 555                    (!battery->technology)?"non-":"");
 556
 557         if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 558                 seq_printf(seq, "design voltage:          unknown\n");
 559         else
 560                 seq_printf(seq, "design voltage:          %d mV\n",
 561                            battery->design_voltage);
 562         seq_printf(seq, "design capacity warning: %d %sh\n",
 563                    battery->design_capacity_warning,
 564                    acpi_battery_units(battery));
 565         seq_printf(seq, "design capacity low:     %d %sh\n",
 566                    battery->design_capacity_low,
 567                    acpi_battery_units(battery));
 568         seq_printf(seq, "capacity granularity 1:  %d %sh\n",
 569                    battery->capacity_granularity_1,
 570                    acpi_battery_units(battery));
 571         seq_printf(seq, "capacity granularity 2:  %d %sh\n",
 572                    battery->capacity_granularity_2,
 573                    acpi_battery_units(battery));
 574         seq_printf(seq, "model number:            %s\n", battery->model_number);
 575         seq_printf(seq, "serial number:           %s\n", battery->serial_number);
 576         seq_printf(seq, "battery type:            %s\n", battery->type);
 577         seq_printf(seq, "OEM info:                %s\n", battery->oem_info);
 578       end:
 579         if (result)
 580                 seq_printf(seq, "ERROR: Unable to read battery info\n");
 581         return result;
 582 }
 583
 584 static int acpi_battery_print_state(struct seq_file *seq, int result)
 585 {
 586         struct acpi_battery *battery = seq->private;
 587
 588         if (result)
 589                 goto end;
 590
 591         seq_printf(seq, "present:                 %s\n",
 592                    acpi_battery_present(battery)?"yes":"no");
 593         if (!acpi_battery_present(battery))
 594                 goto end;
 595
 596         seq_printf(seq, "capacity state:          %s\n",
 597                         (battery->state & 0x04)?"critical":"ok");
 598         if ((battery->state & 0x01) && (battery->state & 0x02))
 599                 seq_printf(seq,
 600                            "charging state:          charging/discharging\n");
 601         else if (battery->state & 0x01)
 602                 seq_printf(seq, "charging state:          discharging\n");
 603         else if (battery->state & 0x02)
 604                 seq_printf(seq, "charging state:          charging\n");
 605         else
 606                 seq_printf(seq, "charging state:          charged\n");
 607
 608         if (battery->current_now == ACPI_BATTERY_VALUE_UNKNOWN)
 609                 seq_printf(seq, "present rate:            unknown\n");
 610         else
 611                 seq_printf(seq, "present rate:            %d %s\n",
 612                            battery->current_now, acpi_battery_units(battery));
 613
 614         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
 615                 seq_printf(seq, "remaining capacity:      unknown\n");
 616         else
 617                 seq_printf(seq, "remaining capacity:      %d %sh\n",
 618                            battery->capacity_now, acpi_battery_units(battery));
 619         if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
 620                 seq_printf(seq, "present voltage:         unknown\n");
 621         else
 622                 seq_printf(seq, "present voltage:         %d mV\n",
 623                            battery->voltage_now);
 624       end:
 625         if (result)
 626                 seq_printf(seq, "ERROR: Unable to read battery state\n");
 627
 628         return result;
 629 }
 630
 631 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
 632 {
 633         struct acpi_battery *battery = seq->private;
 634
 635         if (result)
 636                 goto end;
 637
 638         if (!acpi_battery_present(battery)) {
 639                 seq_printf(seq, "present:                 no\n");
 640                 goto end;
 641         }
 642         seq_printf(seq, "alarm:                   ");
 643         if (!battery->alarm)
 644                 seq_printf(seq, "unsupported\n");
 645         else
 646                 seq_printf(seq, "%u %sh\n", battery->alarm,
 647                                 acpi_battery_units(battery));
 648       end:
 649         if (result)
 650                 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
 651         return result;
 652 }
 653
 654 static ssize_t acpi_battery_write_alarm(struct file *file,
 655                                         const char __user * buffer,
 656                                         size_t count, loff_t * ppos)
 657 {
 658         int result = 0;
 659         char alarm_string[12] = { '\0' };
 660         struct seq_file *m = file->private_data;
 661         struct acpi_battery *battery = m->private;
 662
 663         if (!battery || (count > sizeof(alarm_string) - 1))
 664                 return -EINVAL;
 665         if (!acpi_battery_present(battery)) {
 666                 result = -ENODEV;
 667                 goto end;
 668         }
 669         if (copy_from_user(alarm_string, buffer, count)) {
 670                 result = -EFAULT;
 671                 goto end;
 672         }
 673         alarm_string[count] = '\0';
 674         battery->alarm = simple_strtol(alarm_string, NULL, 0);
 675         result = acpi_battery_set_alarm(battery);
 676       end:
 677         if (!result)
 678                 return count;
 679         return result;
 680 }
 681
 682 typedef int(*print_func)(struct seq_file *seq, int result);
 683
 684 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
 685         acpi_battery_print_info,
 686         acpi_battery_print_state,
 687         acpi_battery_print_alarm,
 688 };
 689
 690 static int acpi_battery_read(int fid, struct seq_file *seq)
 691 {
 692         struct acpi_battery *battery = seq->private;
 693         int result = acpi_battery_update(battery);
 694         return acpi_print_funcs[fid](seq, result);
 695 }
 696
 697 #define DECLARE_FILE_FUNCTIONS(_name) \
 698 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
 699 { \
 700         return acpi_battery_read(_name##_tag, seq); \
 701 } \
 702 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
 703 { \
 704         return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
 705 }
 706
 707 DECLARE_FILE_FUNCTIONS(info);
 708 DECLARE_FILE_FUNCTIONS(state);
 709 DECLARE_FILE_FUNCTIONS(alarm);
 710
 711 #undef DECLARE_FILE_FUNCTIONS
 712
 713 #define FILE_DESCRIPTION_RO(_name) \
 714         { \
 715         .name = __stringify(_name), \
 716         .mode = S_IRUGO, \
 717         .ops = { \
 718                 .open = acpi_battery_##_name##_open_fs, \
 719                 .read = seq_read, \
 720                 .llseek = seq_lseek, \
 721                 .release = single_release, \
 722                 .owner = THIS_MODULE, \
 723                 }, \
 724         }
 725
 726 #define FILE_DESCRIPTION_RW(_name) \
 727         { \
 728         .name = __stringify(_name), \
 729         .mode = S_IFREG | S_IRUGO | S_IWUSR, \
 730         .ops = { \
 731                 .open = acpi_battery_##_name##_open_fs, \
 732                 .read = seq_read, \
 733                 .llseek = seq_lseek, \
 734                 .write = acpi_battery_write_##_name, \
 735                 .release = single_release, \
 736                 .owner = THIS_MODULE, \
 737                 }, \
 738         }
 739
 740 static struct battery_file {
 741         struct file_operations ops;
 742         mode_t mode;
 743         char *name;
 744 } acpi_battery_file[] = {
 745         FILE_DESCRIPTION_RO(info),
 746         FILE_DESCRIPTION_RO(state),
 747         FILE_DESCRIPTION_RW(alarm),
 748 };
 749
 750 #undef FILE_DESCRIPTION_RO
 751 #undef FILE_DESCRIPTION_RW
 752
 753 static int acpi_battery_add_fs(struct acpi_device *device)
 754 {
 755         struct proc_dir_entry *entry = NULL;
 756         int i;
 757
 758         if (!acpi_device_dir(device)) {
 759                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 760                                                      acpi_battery_dir);
 761                 if (!acpi_device_dir(device))
 762                         return -ENODEV;
 763                 acpi_device_dir(device)->owner = THIS_MODULE;
 764         }
 765
 766         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
 767                 entry = proc_create_data(acpi_battery_file[i].name,
 768                                          acpi_battery_file[i].mode,
 769                                          acpi_device_dir(device),
 770                                          &acpi_battery_file[i].ops,
 771                                          acpi_driver_data(device));
 772                 if (!entry)
 773                         return -ENODEV;
 774         }
 775         return 0;
 776 }
 777
 778 static void acpi_battery_remove_fs(struct acpi_device *device)
 779 {
 780         int i;
 781         if (!acpi_device_dir(device))
 782                 return;
 783         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
 784                 remove_proc_entry(acpi_battery_file[i].name,
 785                                   acpi_device_dir(device));
 786
 787         remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
 788         acpi_device_dir(device) = NULL;
 789 }
 790
 791 #endif
 792
 793 /* --------------------------------------------------------------------------
 794                                  Driver Interface
 795    -------------------------------------------------------------------------- */
 796
 797 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
 798 {
 799         struct acpi_battery *battery = data;
 800         struct acpi_device *device;
 801         if (!battery)
 802                 return;
 803         device = battery->device;
 804         acpi_battery_update(battery);
 805         acpi_bus_generate_proc_event(device, event,
 806                                      acpi_battery_present(battery));
 807         acpi_bus_generate_netlink_event(device->pnp.device_class,
 808                                         dev_name(&device->dev), event,
 809                                         acpi_battery_present(battery));
 810 #ifdef CONFIG_ACPI_SYSFS_POWER
 811         /* acpi_batter_update could remove power_supply object */
 812         if (battery->bat.dev)
 813                 kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
 814 #endif
 815 }
 816
 817 static int acpi_battery_add(struct acpi_device *device)
 818 {
 819         int result = 0;
 820         acpi_status status = 0;
 821         struct acpi_battery *battery = NULL;
 822         if (!device)
 823                 return -EINVAL;
 824         battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
 825         if (!battery)
 826                 return -ENOMEM;
 827         battery->device = device;
 828         strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
 829         strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
 830         device->driver_data = battery;
 831         mutex_init(&battery->lock);
 832         acpi_battery_update(battery);
 833 #ifdef CONFIG_ACPI_PROCFS_POWER
 834         result = acpi_battery_add_fs(device);
 835         if (result)
 836                 goto end;
 837 #endif
 838         status = acpi_install_notify_handler(device->handle,
 839                                              ACPI_ALL_NOTIFY,
 840                                              acpi_battery_notify, battery);
 841         if (ACPI_FAILURE(status)) {
 842                 ACPI_EXCEPTION((AE_INFO, status, "Installing notify handler"));
 843                 result = -ENODEV;
 844                 goto end;
 845         }
 846         printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
 847                ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
 848                device->status.battery_present ? "present" : "absent");
 849       end:
 850         if (result) {
 851 #ifdef CONFIG_ACPI_PROCFS_POWER
 852                 acpi_battery_remove_fs(device);
 853 #endif
 854                 kfree(battery);
 855         }
 856         return result;
 857 }
 858
 859 static int acpi_battery_remove(struct acpi_device *device, int type)
 860 {
 861         acpi_status status = 0;
 862         struct acpi_battery *battery = NULL;
 863
 864         if (!device || !acpi_driver_data(device))
 865                 return -EINVAL;
 866         battery = acpi_driver_data(device);
 867         status = acpi_remove_notify_handler(device->handle,
 868                                             ACPI_ALL_NOTIFY,
 869                                             acpi_battery_notify);
 870 #ifdef CONFIG_ACPI_PROCFS_POWER
 871         acpi_battery_remove_fs(device);
 872 #endif
 873 #ifdef CONFIG_ACPI_SYSFS_POWER
 874         sysfs_remove_battery(battery);
 875 #endif
 876         mutex_destroy(&battery->lock);
 877         kfree(battery);
 878         return 0;
 879 }
 880
 881 /* this is needed to learn about changes made in suspended state */
 882 static int acpi_battery_resume(struct acpi_device *device)
 883 {
 884         struct acpi_battery *battery;
 885         if (!device)
 886                 return -EINVAL;
 887         battery = acpi_driver_data(device);
 888         battery->update_time = 0;
 889         acpi_battery_update(battery);
 890         return 0;
 891 }
 892
 893 static struct acpi_driver acpi_battery_driver = {
 894         .name = "battery",
 895         .class = ACPI_BATTERY_CLASS,
 896         .ids = battery_device_ids,
 897         .ops = {
 898                 .add = acpi_battery_add,
 899                 .resume = acpi_battery_resume,
 900                 .remove = acpi_battery_remove,
 901                 },
 902 };
 903
 904 static int __init acpi_battery_init(void)
 905 {
 906         if (acpi_disabled)
 907                 return -ENODEV;
 908 #ifdef CONFIG_ACPI_PROCFS_POWER
 909         acpi_battery_dir = acpi_lock_battery_dir();
 910         if (!acpi_battery_dir)
 911                 return -ENODEV;
 912 #endif
 913         if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
 914 #ifdef CONFIG_ACPI_PROCFS_POWER
 915                 acpi_unlock_battery_dir(acpi_battery_dir);
 916 #endif
 917                 return -ENODEV;
 918         }
 919         return 0;
 920 }
 921
 922 static void __exit acpi_battery_exit(void)
 923 {
 924         acpi_bus_unregister_driver(&acpi_battery_driver);
 925 #ifdef CONFIG_ACPI_PROCFS_POWER
 926         acpi_unlock_battery_dir(acpi_battery_dir);
 927 #endif
 928 }
 929
 930 module_init(acpi_battery_init);
 931 module_exit(acpi_battery_exit);