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 /* For buggy DSDTs that report negative 16-bit values for either charging
  92  * or discharging current and/or report 0 as 65536 due to bad math.
  93  */
  94 #define QUIRK_SIGNED16_CURRENT 0x0001
  95
  96 struct acpi_battery {
  97         struct mutex lock;
  98 #ifdef CONFIG_ACPI_SYSFS_POWER
  99         struct power_supply bat;
 100 #endif
 101         struct acpi_device *device;
 102         unsigned long update_time;
 103         int rate_now;
 104         int capacity_now;
 105         int voltage_now;
 106         int design_capacity;
 107         int full_charge_capacity;
 108         int technology;
 109         int design_voltage;
 110         int design_capacity_warning;
 111         int design_capacity_low;
 112         int capacity_granularity_1;
 113         int capacity_granularity_2;
 114         int alarm;
 115         char model_number[32];
 116         char serial_number[32];
 117         char type[32];
 118         char oem_info[32];
 119         int state;
 120         int power_unit;
 121         u8 alarm_present;
 122         long quirks;
 123 };
 124
 125 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
 126
 127 inline int acpi_battery_present(struct acpi_battery *battery)
 128 {
 129         return battery->device->status.battery_present;
 130 }
 131
 132 #ifdef CONFIG_ACPI_SYSFS_POWER
 133 static int acpi_battery_technology(struct acpi_battery *battery)
 134 {
 135         if (!strcasecmp("NiCd", battery->type))
 136                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 137         if (!strcasecmp("NiMH", battery->type))
 138                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 139         if (!strcasecmp("LION", battery->type))
 140                 return POWER_SUPPLY_TECHNOLOGY_LION;
 141         if (!strncasecmp("LI-ION", battery->type, 6))
 142                 return POWER_SUPPLY_TECHNOLOGY_LION;
 143         if (!strcasecmp("LiP", battery->type))
 144                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 145         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 146 }
 147
 148 static int acpi_battery_get_state(struct acpi_battery *battery);
 149
 150 static int acpi_battery_is_charged(struct acpi_battery *battery)
 151 {
 152         /* either charging or discharging */
 153         if (battery->state != 0)
 154                 return 0;
 155
 156         /* battery not reporting charge */
 157         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
 158             battery->capacity_now == 0)
 159                 return 0;
 160
 161         /* good batteries update full_charge as the batteries degrade */
 162         if (battery->full_charge_capacity == battery->capacity_now)
 163                 return 1;
 164
 165         /* fallback to using design values for broken batteries */
 166         if (battery->design_capacity == battery->capacity_now)
 167                 return 1;
 168
 169         /* we don't do any sort of metric based on percentages */
 170         return 0;
 171 }
 172
 173 static int acpi_battery_get_property(struct power_supply *psy,
 174                                      enum power_supply_property psp,
 175                                      union power_supply_propval *val)
 176 {
 177         struct acpi_battery *battery = to_acpi_battery(psy);
 178
 179         if (acpi_battery_present(battery)) {
 180                 /* run battery update only if it is present */
 181                 acpi_battery_get_state(battery);
 182         } else if (psp != POWER_SUPPLY_PROP_PRESENT)
 183                 return -ENODEV;
 184         switch (psp) {
 185         case POWER_SUPPLY_PROP_STATUS:
 186                 if (battery->state & 0x01)
 187                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 188                 else if (battery->state & 0x02)
 189                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 190                 else if (acpi_battery_is_charged(battery))
 191                         val->intval = POWER_SUPPLY_STATUS_FULL;
 192                 else
 193                         val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 194                 break;
 195         case POWER_SUPPLY_PROP_PRESENT:
 196                 val->intval = acpi_battery_present(battery);
 197                 break;
 198         case POWER_SUPPLY_PROP_TECHNOLOGY:
 199                 val->intval = acpi_battery_technology(battery);
 200                 break;
 201         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 202                 val->intval = battery->design_voltage * 1000;
 203                 break;
 204         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 205                 val->intval = battery->voltage_now * 1000;
 206                 break;
 207         case POWER_SUPPLY_PROP_CURRENT_NOW:
 208         case POWER_SUPPLY_PROP_POWER_NOW:
 209                 val->intval = battery->rate_now * 1000;
 210                 break;
 211         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 212         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 213                 val->intval = battery->design_capacity * 1000;
 214                 break;
 215         case POWER_SUPPLY_PROP_CHARGE_FULL:
 216         case POWER_SUPPLY_PROP_ENERGY_FULL:
 217                 val->intval = battery->full_charge_capacity * 1000;
 218                 break;
 219         case POWER_SUPPLY_PROP_CHARGE_NOW:
 220         case POWER_SUPPLY_PROP_ENERGY_NOW:
 221                 val->intval = battery->capacity_now * 1000;
 222                 break;
 223         case POWER_SUPPLY_PROP_MODEL_NAME:
 224                 val->strval = battery->model_number;
 225                 break;
 226         case POWER_SUPPLY_PROP_MANUFACTURER:
 227                 val->strval = battery->oem_info;
 228                 break;
 229         case POWER_SUPPLY_PROP_SERIAL_NUMBER:
 230                 val->strval = battery->serial_number;
 231                 break;
 232         default:
 233                 return -EINVAL;
 234         }
 235         return 0;
 236 }
 237
 238 static enum power_supply_property charge_battery_props[] = {
 239         POWER_SUPPLY_PROP_STATUS,
 240         POWER_SUPPLY_PROP_PRESENT,
 241         POWER_SUPPLY_PROP_TECHNOLOGY,
 242         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 243         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 244         POWER_SUPPLY_PROP_CURRENT_NOW,
 245         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 246         POWER_SUPPLY_PROP_CHARGE_FULL,
 247         POWER_SUPPLY_PROP_CHARGE_NOW,
 248         POWER_SUPPLY_PROP_MODEL_NAME,
 249         POWER_SUPPLY_PROP_MANUFACTURER,
 250         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 251 };
 252
 253 static enum power_supply_property energy_battery_props[] = {
 254         POWER_SUPPLY_PROP_STATUS,
 255         POWER_SUPPLY_PROP_PRESENT,
 256         POWER_SUPPLY_PROP_TECHNOLOGY,
 257         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 258         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 259         POWER_SUPPLY_PROP_CURRENT_NOW,
 260         POWER_SUPPLY_PROP_POWER_NOW,
 261         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 262         POWER_SUPPLY_PROP_ENERGY_FULL,
 263         POWER_SUPPLY_PROP_ENERGY_NOW,
 264         POWER_SUPPLY_PROP_MODEL_NAME,
 265         POWER_SUPPLY_PROP_MANUFACTURER,
 266         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 267 };
 268 #endif
 269
 270 #ifdef CONFIG_ACPI_PROCFS_POWER
 271 inline char *acpi_battery_units(struct acpi_battery *battery)
 272 {
 273         return (battery->power_unit)?"mA":"mW";
 274 }
 275 #endif
 276
 277 /* --------------------------------------------------------------------------
 278                                Battery Management
 279    -------------------------------------------------------------------------- */
 280 struct acpi_offsets {
 281         size_t offset;          /* offset inside struct acpi_sbs_battery */
 282         u8 mode;                /* int or string? */
 283 };
 284
 285 static struct acpi_offsets state_offsets[] = {
 286         {offsetof(struct acpi_battery, state), 0},
 287         {offsetof(struct acpi_battery, rate_now), 0},
 288         {offsetof(struct acpi_battery, capacity_now), 0},
 289         {offsetof(struct acpi_battery, voltage_now), 0},
 290 };
 291
 292 static struct acpi_offsets info_offsets[] = {
 293         {offsetof(struct acpi_battery, power_unit), 0},
 294         {offsetof(struct acpi_battery, design_capacity), 0},
 295         {offsetof(struct acpi_battery, full_charge_capacity), 0},
 296         {offsetof(struct acpi_battery, technology), 0},
 297         {offsetof(struct acpi_battery, design_voltage), 0},
 298         {offsetof(struct acpi_battery, design_capacity_warning), 0},
 299         {offsetof(struct acpi_battery, design_capacity_low), 0},
 300         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
 301         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
 302         {offsetof(struct acpi_battery, model_number), 1},
 303         {offsetof(struct acpi_battery, serial_number), 1},
 304         {offsetof(struct acpi_battery, type), 1},
 305         {offsetof(struct acpi_battery, oem_info), 1},
 306 };
 307
 308 static int extract_package(struct acpi_battery *battery,
 309                            union acpi_object *package,
 310                            struct acpi_offsets *offsets, int num)
 311 {
 312         int i;
 313         union acpi_object *element;
 314         if (package->type != ACPI_TYPE_PACKAGE)
 315                 return -EFAULT;
 316         for (i = 0; i < num; ++i) {
 317                 if (package->package.count <= i)
 318                         return -EFAULT;
 319                 element = &package->package.elements[i];
 320                 if (offsets[i].mode) {
 321                         u8 *ptr = (u8 *)battery + offsets[i].offset;
 322                         if (element->type == ACPI_TYPE_STRING ||
 323                             element->type == ACPI_TYPE_BUFFER)
 324                                 strncpy(ptr, element->string.pointer, 32);
 325                         else if (element->type == ACPI_TYPE_INTEGER) {
 326                                 strncpy(ptr, (u8 *)&element->integer.value,
 327                                         sizeof(u64));
 328                                 ptr[sizeof(u64)] = 0;
 329                         } else
 330                                 *ptr = 0; /* don't have value */
 331                 } else {
 332                         int *x = (int *)((u8 *)battery + offsets[i].offset);
 333                         *x = (element->type == ACPI_TYPE_INTEGER) ?
 334                                 element->integer.value : -1;
 335                 }
 336         }
 337         return 0;
 338 }
 339
 340 static int acpi_battery_get_status(struct acpi_battery *battery)
 341 {
 342         if (acpi_bus_get_status(battery->device)) {
 343                 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
 344                 return -ENODEV;
 345         }
 346         return 0;
 347 }
 348
 349 static int acpi_battery_get_info(struct acpi_battery *battery)
 350 {
 351         int result = -EFAULT;
 352         acpi_status status = 0;
 353         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 354
 355         if (!acpi_battery_present(battery))
 356                 return 0;
 357         mutex_lock(&battery->lock);
 358         status = acpi_evaluate_object(battery->device->handle, "_BIF",
 359                                       NULL, &buffer);
 360         mutex_unlock(&battery->lock);
 361
 362         if (ACPI_FAILURE(status)) {
 363                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
 364                 return -ENODEV;
 365         }
 366
 367         result = extract_package(battery, buffer.pointer,
 368                                  info_offsets, ARRAY_SIZE(info_offsets));
 369         kfree(buffer.pointer);
 370         return result;
 371 }
 372
 373 static int acpi_battery_get_state(struct acpi_battery *battery)
 374 {
 375         int result = 0;
 376         acpi_status status = 0;
 377         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 378
 379         if (!acpi_battery_present(battery))
 380                 return 0;
 381
 382         if (battery->update_time &&
 383             time_before(jiffies, battery->update_time +
 384                         msecs_to_jiffies(cache_time)))
 385                 return 0;
 386
 387         mutex_lock(&battery->lock);
 388         status = acpi_evaluate_object(battery->device->handle, "_BST",
 389                                       NULL, &buffer);
 390         mutex_unlock(&battery->lock);
 391
 392         if (ACPI_FAILURE(status)) {
 393                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
 394                 return -ENODEV;
 395         }
 396
 397         result = extract_package(battery, buffer.pointer,
 398                                  state_offsets, ARRAY_SIZE(state_offsets));
 399         battery->update_time = jiffies;
 400         kfree(buffer.pointer);
 401
 402         if ((battery->quirks & QUIRK_SIGNED16_CURRENT) &&
 403             battery->rate_now != -1)
 404                 battery->rate_now = abs((s16)battery->rate_now);
 405
 406         return result;
 407 }
 408
 409 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 410 {
 411         acpi_status status = 0;
 412         union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
 413         struct acpi_object_list arg_list = { 1, &arg0 };
 414
 415         if (!acpi_battery_present(battery)|| !battery->alarm_present)
 416                 return -ENODEV;
 417
 418         arg0.integer.value = battery->alarm;
 419
 420         mutex_lock(&battery->lock);
 421         status = acpi_evaluate_object(battery->device->handle, "_BTP",
 422                                  &arg_list, NULL);
 423         mutex_unlock(&battery->lock);
 424
 425         if (ACPI_FAILURE(status))
 426                 return -ENODEV;
 427
 428         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
 429         return 0;
 430 }
 431
 432 static int acpi_battery_init_alarm(struct acpi_battery *battery)
 433 {
 434         acpi_status status = AE_OK;
 435         acpi_handle handle = NULL;
 436
 437         /* See if alarms are supported, and if so, set default */
 438         status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
 439         if (ACPI_FAILURE(status)) {
 440                 battery->alarm_present = 0;
 441                 return 0;
 442         }
 443         battery->alarm_present = 1;
 444         if (!battery->alarm)
 445                 battery->alarm = battery->design_capacity_warning;
 446         return acpi_battery_set_alarm(battery);
 447 }
 448
 449 #ifdef CONFIG_ACPI_SYSFS_POWER
 450 static ssize_t acpi_battery_alarm_show(struct device *dev,
 451                                         struct device_attribute *attr,
 452                                         char *buf)
 453 {
 454         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 455         return sprintf(buf, "%d\n", battery->alarm * 1000);
 456 }
 457
 458 static ssize_t acpi_battery_alarm_store(struct device *dev,
 459                                         struct device_attribute *attr,
 460                                         const char *buf, size_t count)
 461 {
 462         unsigned long x;
 463         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 464         if (sscanf(buf, "%ld\n", &x) == 1)
 465                 battery->alarm = x/1000;
 466         if (acpi_battery_present(battery))
 467                 acpi_battery_set_alarm(battery);
 468         return count;
 469 }
 470
 471 static struct device_attribute alarm_attr = {
 472         .attr = {.name = "alarm", .mode = 0644},
 473         .show = acpi_battery_alarm_show,
 474         .store = acpi_battery_alarm_store,
 475 };
 476
 477 static int sysfs_add_battery(struct acpi_battery *battery)
 478 {
 479         int result;
 480
 481         if (battery->power_unit) {
 482                 battery->bat.properties = charge_battery_props;
 483                 battery->bat.num_properties =
 484                         ARRAY_SIZE(charge_battery_props);
 485         } else {
 486                 battery->bat.properties = energy_battery_props;
 487                 battery->bat.num_properties =
 488                         ARRAY_SIZE(energy_battery_props);
 489         }
 490
 491         battery->bat.name = acpi_device_bid(battery->device);
 492         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 493         battery->bat.get_property = acpi_battery_get_property;
 494
 495         result = power_supply_register(&battery->device->dev, &battery->bat);
 496         if (result)
 497                 return result;
 498         return device_create_file(battery->bat.dev, &alarm_attr);
 499 }
 500
 501 static void sysfs_remove_battery(struct acpi_battery *battery)
 502 {
 503         if (!battery->bat.dev)
 504                 return;
 505         device_remove_file(battery->bat.dev, &alarm_attr);
 506         power_supply_unregister(&battery->bat);
 507         battery->bat.dev = NULL;
 508 }
 509 #endif
 510
 511 static void acpi_battery_quirks(struct acpi_battery *battery)
 512 {
 513         battery->quirks = 0;
 514         if (dmi_name_in_vendors("Acer") && battery->power_unit) {
 515                 battery->quirks |= QUIRK_SIGNED16_CURRENT;
 516         }
 517 }
 518
 519 static int acpi_battery_update(struct acpi_battery *battery)
 520 {
 521         int result, old_present = acpi_battery_present(battery);
 522         result = acpi_battery_get_status(battery);
 523         if (result)
 524                 return result;
 525 #ifdef CONFIG_ACPI_SYSFS_POWER
 526         if (!acpi_battery_present(battery)) {
 527                 sysfs_remove_battery(battery);
 528                 battery->update_time = 0;
 529                 return 0;
 530         }
 531 #endif
 532         if (!battery->update_time ||
 533             old_present != acpi_battery_present(battery)) {
 534                 result = acpi_battery_get_info(battery);
 535                 if (result)
 536                         return result;
 537                 acpi_battery_quirks(battery);
 538                 acpi_battery_init_alarm(battery);
 539         }
 540 #ifdef CONFIG_ACPI_SYSFS_POWER
 541         if (!battery->bat.dev)
 542                 sysfs_add_battery(battery);
 543 #endif
 544         return acpi_battery_get_state(battery);
 545 }
 546
 547 /* --------------------------------------------------------------------------
 548                               FS Interface (/proc)
 549    -------------------------------------------------------------------------- */
 550
 551 #ifdef CONFIG_ACPI_PROCFS_POWER
 552 static struct proc_dir_entry *acpi_battery_dir;
 553
 554 static int acpi_battery_print_info(struct seq_file *seq, int result)
 555 {
 556         struct acpi_battery *battery = seq->private;
 557
 558         if (result)
 559                 goto end;
 560
 561         seq_printf(seq, "present:                 %s\n",
 562                    acpi_battery_present(battery)?"yes":"no");
 563         if (!acpi_battery_present(battery))
 564                 goto end;
 565         if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 566                 seq_printf(seq, "design capacity:         unknown\n");
 567         else
 568                 seq_printf(seq, "design capacity:         %d %sh\n",
 569                            battery->design_capacity,
 570                            acpi_battery_units(battery));
 571
 572         if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 573                 seq_printf(seq, "last full capacity:      unknown\n");
 574         else
 575                 seq_printf(seq, "last full capacity:      %d %sh\n",
 576                            battery->full_charge_capacity,
 577                            acpi_battery_units(battery));
 578
 579         seq_printf(seq, "battery technology:      %srechargeable\n",
 580                    (!battery->technology)?"non-":"");
 581
 582         if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 583                 seq_printf(seq, "design voltage:          unknown\n");
 584         else
 585                 seq_printf(seq, "design voltage:          %d mV\n",
 586                            battery->design_voltage);
 587         seq_printf(seq, "design capacity warning: %d %sh\n",
 588                    battery->design_capacity_warning,
 589                    acpi_battery_units(battery));
 590         seq_printf(seq, "design capacity low:     %d %sh\n",
 591                    battery->design_capacity_low,
 592                    acpi_battery_units(battery));
 593         seq_printf(seq, "capacity granularity 1:  %d %sh\n",
 594                    battery->capacity_granularity_1,
 595                    acpi_battery_units(battery));
 596         seq_printf(seq, "capacity granularity 2:  %d %sh\n",
 597                    battery->capacity_granularity_2,
 598                    acpi_battery_units(battery));
 599         seq_printf(seq, "model number:            %s\n", battery->model_number);
 600         seq_printf(seq, "serial number:           %s\n", battery->serial_number);
 601         seq_printf(seq, "battery type:            %s\n", battery->type);
 602         seq_printf(seq, "OEM info:                %s\n", battery->oem_info);
 603       end:
 604         if (result)
 605                 seq_printf(seq, "ERROR: Unable to read battery info\n");
 606         return result;
 607 }
 608
 609 static int acpi_battery_print_state(struct seq_file *seq, int result)
 610 {
 611         struct acpi_battery *battery = seq->private;
 612
 613         if (result)
 614                 goto end;
 615
 616         seq_printf(seq, "present:                 %s\n",
 617                    acpi_battery_present(battery)?"yes":"no");
 618         if (!acpi_battery_present(battery))
 619                 goto end;
 620
 621         seq_printf(seq, "capacity state:          %s\n",
 622                         (battery->state & 0x04)?"critical":"ok");
 623         if ((battery->state & 0x01) && (battery->state & 0x02))
 624                 seq_printf(seq,
 625                            "charging state:          charging/discharging\n");
 626         else if (battery->state & 0x01)
 627                 seq_printf(seq, "charging state:          discharging\n");
 628         else if (battery->state & 0x02)
 629                 seq_printf(seq, "charging state:          charging\n");
 630         else
 631                 seq_printf(seq, "charging state:          charged\n");
 632
 633         if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
 634                 seq_printf(seq, "present rate:            unknown\n");
 635         else
 636                 seq_printf(seq, "present rate:            %d %s\n",
 637                            battery->rate_now, acpi_battery_units(battery));
 638
 639         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
 640                 seq_printf(seq, "remaining capacity:      unknown\n");
 641         else
 642                 seq_printf(seq, "remaining capacity:      %d %sh\n",
 643                            battery->capacity_now, acpi_battery_units(battery));
 644         if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
 645                 seq_printf(seq, "present voltage:         unknown\n");
 646         else
 647                 seq_printf(seq, "present voltage:         %d mV\n",
 648                            battery->voltage_now);
 649       end:
 650         if (result)
 651                 seq_printf(seq, "ERROR: Unable to read battery state\n");
 652
 653         return result;
 654 }
 655
 656 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
 657 {
 658         struct acpi_battery *battery = seq->private;
 659
 660         if (result)
 661                 goto end;
 662
 663         if (!acpi_battery_present(battery)) {
 664                 seq_printf(seq, "present:                 no\n");
 665                 goto end;
 666         }
 667         seq_printf(seq, "alarm:                   ");
 668         if (!battery->alarm)
 669                 seq_printf(seq, "unsupported\n");
 670         else
 671                 seq_printf(seq, "%u %sh\n", battery->alarm,
 672                                 acpi_battery_units(battery));
 673       end:
 674         if (result)
 675                 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
 676         return result;
 677 }
 678
 679 static ssize_t acpi_battery_write_alarm(struct file *file,
 680                                         const char __user * buffer,
 681                                         size_t count, loff_t * ppos)
 682 {
 683         int result = 0;
 684         char alarm_string[12] = { '\0' };
 685         struct seq_file *m = file->private_data;
 686         struct acpi_battery *battery = m->private;
 687
 688         if (!battery || (count > sizeof(alarm_string) - 1))
 689                 return -EINVAL;
 690         if (!acpi_battery_present(battery)) {
 691                 result = -ENODEV;
 692                 goto end;
 693         }
 694         if (copy_from_user(alarm_string, buffer, count)) {
 695                 result = -EFAULT;
 696                 goto end;
 697         }
 698         alarm_string[count] = '\0';
 699         battery->alarm = simple_strtol(alarm_string, NULL, 0);
 700         result = acpi_battery_set_alarm(battery);
 701       end:
 702         if (!result)
 703                 return count;
 704         return result;
 705 }
 706
 707 typedef int(*print_func)(struct seq_file *seq, int result);
 708
 709 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
 710         acpi_battery_print_info,
 711         acpi_battery_print_state,
 712         acpi_battery_print_alarm,
 713 };
 714
 715 static int acpi_battery_read(int fid, struct seq_file *seq)
 716 {
 717         struct acpi_battery *battery = seq->private;
 718         int result = acpi_battery_update(battery);
 719         return acpi_print_funcs[fid](seq, result);
 720 }
 721
 722 #define DECLARE_FILE_FUNCTIONS(_name) \
 723 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
 724 { \
 725         return acpi_battery_read(_name##_tag, seq); \
 726 } \
 727 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
 728 { \
 729         return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
 730 }
 731
 732 DECLARE_FILE_FUNCTIONS(info);
 733 DECLARE_FILE_FUNCTIONS(state);
 734 DECLARE_FILE_FUNCTIONS(alarm);
 735
 736 #undef DECLARE_FILE_FUNCTIONS
 737
 738 #define FILE_DESCRIPTION_RO(_name) \
 739         { \
 740         .name = __stringify(_name), \
 741         .mode = S_IRUGO, \
 742         .ops = { \
 743                 .open = acpi_battery_##_name##_open_fs, \
 744                 .read = seq_read, \
 745                 .llseek = seq_lseek, \
 746                 .release = single_release, \
 747                 .owner = THIS_MODULE, \
 748                 }, \
 749         }
 750
 751 #define FILE_DESCRIPTION_RW(_name) \
 752         { \
 753         .name = __stringify(_name), \
 754         .mode = S_IFREG | S_IRUGO | S_IWUSR, \
 755         .ops = { \
 756                 .open = acpi_battery_##_name##_open_fs, \
 757                 .read = seq_read, \
 758                 .llseek = seq_lseek, \
 759                 .write = acpi_battery_write_##_name, \
 760                 .release = single_release, \
 761                 .owner = THIS_MODULE, \
 762                 }, \
 763         }
 764
 765 static struct battery_file {
 766         struct file_operations ops;
 767         mode_t mode;
 768         const char *name;
 769 } acpi_battery_file[] = {
 770         FILE_DESCRIPTION_RO(info),
 771         FILE_DESCRIPTION_RO(state),
 772         FILE_DESCRIPTION_RW(alarm),
 773 };
 774
 775 #undef FILE_DESCRIPTION_RO
 776 #undef FILE_DESCRIPTION_RW
 777
 778 static int acpi_battery_add_fs(struct acpi_device *device)
 779 {
 780         struct proc_dir_entry *entry = NULL;
 781         int i;
 782
 783         if (!acpi_device_dir(device)) {
 784                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 785                                                      acpi_battery_dir);
 786                 if (!acpi_device_dir(device))
 787                         return -ENODEV;
 788         }
 789
 790         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
 791                 entry = proc_create_data(acpi_battery_file[i].name,
 792                                          acpi_battery_file[i].mode,
 793                                          acpi_device_dir(device),
 794                                          &acpi_battery_file[i].ops,
 795                                          acpi_driver_data(device));
 796                 if (!entry)
 797                         return -ENODEV;
 798         }
 799         return 0;
 800 }
 801
 802 static void acpi_battery_remove_fs(struct acpi_device *device)
 803 {
 804         int i;
 805         if (!acpi_device_dir(device))
 806                 return;
 807         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
 808                 remove_proc_entry(acpi_battery_file[i].name,
 809                                   acpi_device_dir(device));
 810
 811         remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
 812         acpi_device_dir(device) = NULL;
 813 }
 814
 815 #endif
 816
 817 /* --------------------------------------------------------------------------
 818                                  Driver Interface
 819    -------------------------------------------------------------------------- */
 820
 821 static void acpi_battery_notify(struct acpi_device *device, u32 event)
 822 {
 823         struct acpi_battery *battery = acpi_driver_data(device);
 824
 825         if (!battery)
 826                 return;
 827         acpi_battery_update(battery);
 828         acpi_bus_generate_proc_event(device, event,
 829                                      acpi_battery_present(battery));
 830         acpi_bus_generate_netlink_event(device->pnp.device_class,
 831                                         dev_name(&device->dev), event,
 832                                         acpi_battery_present(battery));
 833 #ifdef CONFIG_ACPI_SYSFS_POWER
 834         /* acpi_battery_update could remove power_supply object */
 835         if (battery->bat.dev)
 836                 kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
 837 #endif
 838 }
 839
 840 static int acpi_battery_add(struct acpi_device *device)
 841 {
 842         int result = 0;
 843         struct acpi_battery *battery = NULL;
 844         if (!device)
 845                 return -EINVAL;
 846         battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
 847         if (!battery)
 848                 return -ENOMEM;
 849         battery->device = device;
 850         strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
 851         strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
 852         device->driver_data = battery;
 853         mutex_init(&battery->lock);
 854         acpi_battery_update(battery);
 855 #ifdef CONFIG_ACPI_PROCFS_POWER
 856         result = acpi_battery_add_fs(device);
 857 #endif
 858         if (!result) {
 859                 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
 860                         ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
 861                         device->status.battery_present ? "present" : "absent");
 862         } else {
 863 #ifdef CONFIG_ACPI_PROCFS_POWER
 864                 acpi_battery_remove_fs(device);
 865 #endif
 866                 kfree(battery);
 867         }
 868         return result;
 869 }
 870
 871 static int acpi_battery_remove(struct acpi_device *device, int type)
 872 {
 873         struct acpi_battery *battery = NULL;
 874
 875         if (!device || !acpi_driver_data(device))
 876                 return -EINVAL;
 877         battery = acpi_driver_data(device);
 878 #ifdef CONFIG_ACPI_PROCFS_POWER
 879         acpi_battery_remove_fs(device);
 880 #endif
 881 #ifdef CONFIG_ACPI_SYSFS_POWER
 882         sysfs_remove_battery(battery);
 883 #endif
 884         mutex_destroy(&battery->lock);
 885         kfree(battery);
 886         return 0;
 887 }
 888
 889 /* this is needed to learn about changes made in suspended state */
 890 static int acpi_battery_resume(struct acpi_device *device)
 891 {
 892         struct acpi_battery *battery;
 893         if (!device)
 894                 return -EINVAL;
 895         battery = acpi_driver_data(device);
 896         battery->update_time = 0;
 897         acpi_battery_update(battery);
 898         return 0;
 899 }
 900
 901 static struct acpi_driver acpi_battery_driver = {
 902         .name = "battery",
 903         .class = ACPI_BATTERY_CLASS,
 904         .ids = battery_device_ids,
 905         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
 906         .ops = {
 907                 .add = acpi_battery_add,
 908                 .resume = acpi_battery_resume,
 909                 .remove = acpi_battery_remove,
 910                 .notify = acpi_battery_notify,
 911                 },
 912 };
 913
 914 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
 915 {
 916         if (acpi_disabled)
 917                 return;
 918 #ifdef CONFIG_ACPI_PROCFS_POWER
 919         acpi_battery_dir = acpi_lock_battery_dir();
 920         if (!acpi_battery_dir)
 921                 return;
 922 #endif
 923         if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
 924 #ifdef CONFIG_ACPI_PROCFS_POWER
 925                 acpi_unlock_battery_dir(acpi_battery_dir);
 926 #endif
 927                 return;
 928         }
 929         return;
 930 }
 931
 932 static int __init acpi_battery_init(void)
 933 {
 934         async_schedule(acpi_battery_init_async, NULL);
 935         return 0;
 936 }
 937
 938 static void __exit acpi_battery_exit(void)
 939 {
 940         acpi_bus_unregister_driver(&acpi_battery_driver);
 941 #ifdef CONFIG_ACPI_PROCFS_POWER
 942         acpi_unlock_battery_dir(acpi_battery_dir);
 943 #endif
 944 }
 945
 946 module_init(acpi_battery_init);
 947 module_exit(acpi_battery_exit);