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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 #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 ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
  49
  50 #define ACPI_BATTERY_CLASS              "battery"
  51 #define ACPI_BATTERY_DEVICE_NAME        "Battery"
  52 #define ACPI_BATTERY_NOTIFY_STATUS      0x80
  53 #define ACPI_BATTERY_NOTIFY_INFO        0x81
  54
  55 #define _COMPONENT              ACPI_BATTERY_COMPONENT
  56
  57 ACPI_MODULE_NAME("battery");
  58
  59 MODULE_AUTHOR("Paul Diefenbaugh");
  60 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
  61 MODULE_DESCRIPTION("ACPI Battery Driver");
  62 MODULE_LICENSE("GPL");
  63
  64 static unsigned int cache_time = 1000;
  65 module_param(cache_time, uint, 0644);
  66 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  67
  68 #ifdef CONFIG_ACPI_PROCFS_POWER
  69 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
  70 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
  71
  72 enum acpi_battery_files {
  73         info_tag = 0,
  74         state_tag,
  75         alarm_tag,
  76         ACPI_BATTERY_NUMFILES,
  77 };
  78
  79 #endif
  80
  81 static const struct acpi_device_id battery_device_ids[] = {
  82         {"PNP0C0A", 0},
  83         {"", 0},
  84 };
  85
  86 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
  87
  88
  89 struct acpi_battery {
  90         struct mutex lock;
  91 #ifdef CONFIG_ACPI_SYSFS_POWER
  92         struct power_supply bat;
  93 #endif
  94         struct acpi_device *device;
  95         unsigned long update_time;
  96         int rate_now;
  97         int capacity_now;
  98         int voltage_now;
  99         int design_capacity;
 100         int full_charge_capacity;
 101         int technology;
 102         int design_voltage;
 103         int design_capacity_warning;
 104         int design_capacity_low;
 105         int capacity_granularity_1;
 106         int capacity_granularity_2;
 107         int alarm;
 108         char model_number[32];
 109         char serial_number[32];
 110         char type[32];
 111         char oem_info[32];
 112         int state;
 113         int power_unit;
 114         u8 alarm_present;
 115 };
 116
 117 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
 118
 119 inline int acpi_battery_present(struct acpi_battery *battery)
 120 {
 121         return battery->device->status.battery_present;
 122 }
 123
 124 #ifdef CONFIG_ACPI_SYSFS_POWER
 125 static int acpi_battery_technology(struct acpi_battery *battery)
 126 {
 127         if (!strcasecmp("NiCd", battery->type))
 128                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 129         if (!strcasecmp("NiMH", battery->type))
 130                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 131         if (!strcasecmp("LION", battery->type))
 132                 return POWER_SUPPLY_TECHNOLOGY_LION;
 133         if (!strncasecmp("LI-ION", battery->type, 6))
 134                 return POWER_SUPPLY_TECHNOLOGY_LION;
 135         if (!strcasecmp("LiP", battery->type))
 136                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 137         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 138 }
 139
 140 static int acpi_battery_get_state(struct acpi_battery *battery);
 141
 142 static int acpi_battery_is_charged(struct acpi_battery *battery)
 143 {
 144         /* either charging or discharging */
 145         if (battery->state != 0)
 146                 return 0;
 147
 148         /* battery not reporting charge */
 149         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
 150             battery->capacity_now == 0)
 151                 return 0;
 152
 153         /* good batteries update full_charge as the batteries degrade */
 154         if (battery->full_charge_capacity == battery->capacity_now)
 155                 return 1;
 156
 157         /* fallback to using design values for broken batteries */
 158         if (battery->design_capacity == battery->capacity_now)
 159                 return 1;
 160
 161         /* we don't do any sort of metric based on percentages */
 162         return 0;
 163 }
 164
 165 static int acpi_battery_get_property(struct power_supply *psy,
 166                                      enum power_supply_property psp,
 167                                      union power_supply_propval *val)
 168 {
 169         struct acpi_battery *battery = to_acpi_battery(psy);
 170
 171         if (acpi_battery_present(battery)) {
 172                 /* run battery update only if it is present */
 173                 acpi_battery_get_state(battery);
 174         } else if (psp != POWER_SUPPLY_PROP_PRESENT)
 175                 return -ENODEV;
 176         switch (psp) {
 177         case POWER_SUPPLY_PROP_STATUS:
 178                 if (battery->state & 0x01)
 179                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 180                 else if (battery->state & 0x02)
 181                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 182                 else if (acpi_battery_is_charged(battery))
 183                         val->intval = POWER_SUPPLY_STATUS_FULL;
 184                 else
 185                         val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 186                 break;
 187         case POWER_SUPPLY_PROP_PRESENT:
 188                 val->intval = acpi_battery_present(battery);
 189                 break;
 190         case POWER_SUPPLY_PROP_TECHNOLOGY:
 191                 val->intval = acpi_battery_technology(battery);
 192                 break;
 193         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 194                 val->intval = battery->design_voltage * 1000;
 195                 break;
 196         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 197                 val->intval = battery->voltage_now * 1000;
 198                 break;
 199         case POWER_SUPPLY_PROP_CURRENT_NOW:
 200         case POWER_SUPPLY_PROP_POWER_NOW:
 201                 val->intval = battery->rate_now * 1000;
 202                 break;
 203         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 204         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 205                 val->intval = battery->design_capacity * 1000;
 206                 break;
 207         case POWER_SUPPLY_PROP_CHARGE_FULL:
 208         case POWER_SUPPLY_PROP_ENERGY_FULL:
 209                 val->intval = battery->full_charge_capacity * 1000;
 210                 break;
 211         case POWER_SUPPLY_PROP_CHARGE_NOW:
 212         case POWER_SUPPLY_PROP_ENERGY_NOW:
 213                 val->intval = battery->capacity_now * 1000;
 214                 break;
 215         case POWER_SUPPLY_PROP_MODEL_NAME:
 216                 val->strval = battery->model_number;
 217                 break;
 218         case POWER_SUPPLY_PROP_MANUFACTURER:
 219                 val->strval = battery->oem_info;
 220                 break;
 221         case POWER_SUPPLY_PROP_SERIAL_NUMBER:
 222                 val->strval = battery->serial_number;
 223                 break;
 224         default:
 225                 return -EINVAL;
 226         }
 227         return 0;
 228 }
 229
 230 static enum power_supply_property charge_battery_props[] = {
 231         POWER_SUPPLY_PROP_STATUS,
 232         POWER_SUPPLY_PROP_PRESENT,
 233         POWER_SUPPLY_PROP_TECHNOLOGY,
 234         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 235         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 236         POWER_SUPPLY_PROP_CURRENT_NOW,
 237         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 238         POWER_SUPPLY_PROP_CHARGE_FULL,
 239         POWER_SUPPLY_PROP_CHARGE_NOW,
 240         POWER_SUPPLY_PROP_MODEL_NAME,
 241         POWER_SUPPLY_PROP_MANUFACTURER,
 242         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 243 };
 244
 245 static enum power_supply_property energy_battery_props[] = {
 246         POWER_SUPPLY_PROP_STATUS,
 247         POWER_SUPPLY_PROP_PRESENT,
 248         POWER_SUPPLY_PROP_TECHNOLOGY,
 249         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 250         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 251         POWER_SUPPLY_PROP_CURRENT_NOW,
 252         POWER_SUPPLY_PROP_POWER_NOW,
 253         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 254         POWER_SUPPLY_PROP_ENERGY_FULL,
 255         POWER_SUPPLY_PROP_ENERGY_NOW,
 256         POWER_SUPPLY_PROP_MODEL_NAME,
 257         POWER_SUPPLY_PROP_MANUFACTURER,
 258         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 259 };
 260 #endif
 261
 262 #ifdef CONFIG_ACPI_PROCFS_POWER
 263 inline char *acpi_battery_units(struct acpi_battery *battery)
 264 {
 265         return (battery->power_unit)?"mA":"mW";
 266 }
 267 #endif
 268
 269 /* --------------------------------------------------------------------------
 270                                Battery Management
 271    -------------------------------------------------------------------------- */
 272 struct acpi_offsets {
 273         size_t offset;          /* offset inside struct acpi_sbs_battery */
 274         u8 mode;                /* int or string? */
 275 };
 276
 277 static struct acpi_offsets state_offsets[] = {
 278         {offsetof(struct acpi_battery, state), 0},
 279         {offsetof(struct acpi_battery, rate_now), 0},
 280         {offsetof(struct acpi_battery, capacity_now), 0},
 281         {offsetof(struct acpi_battery, voltage_now), 0},
 282 };
 283
 284 static struct acpi_offsets info_offsets[] = {
 285         {offsetof(struct acpi_battery, power_unit), 0},
 286         {offsetof(struct acpi_battery, design_capacity), 0},
 287         {offsetof(struct acpi_battery, full_charge_capacity), 0},
 288         {offsetof(struct acpi_battery, technology), 0},
 289         {offsetof(struct acpi_battery, design_voltage), 0},
 290         {offsetof(struct acpi_battery, design_capacity_warning), 0},
 291         {offsetof(struct acpi_battery, design_capacity_low), 0},
 292         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
 293         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
 294         {offsetof(struct acpi_battery, model_number), 1},
 295         {offsetof(struct acpi_battery, serial_number), 1},
 296         {offsetof(struct acpi_battery, type), 1},
 297         {offsetof(struct acpi_battery, oem_info), 1},
 298 };
 299
 300 static int extract_package(struct acpi_battery *battery,
 301                            union acpi_object *package,
 302                            struct acpi_offsets *offsets, int num)
 303 {
 304         int i;
 305         union acpi_object *element;
 306         if (package->type != ACPI_TYPE_PACKAGE)
 307                 return -EFAULT;
 308         for (i = 0; i < num; ++i) {
 309                 if (package->package.count <= i)
 310                         return -EFAULT;
 311                 element = &package->package.elements[i];
 312                 if (offsets[i].mode) {
 313                         u8 *ptr = (u8 *)battery + offsets[i].offset;
 314                         if (element->type == ACPI_TYPE_STRING ||
 315                             element->type == ACPI_TYPE_BUFFER)
 316                                 strncpy(ptr, element->string.pointer, 32);
 317                         else if (element->type == ACPI_TYPE_INTEGER) {
 318                                 strncpy(ptr, (u8 *)&element->integer.value,
 319                                         sizeof(acpi_integer));
 320                                 ptr[sizeof(acpi_integer)] = 0;
 321                         } else
 322                                 *ptr = 0; /* don't have value */
 323                 } else {
 324                         int *x = (int *)((u8 *)battery + offsets[i].offset);
 325                         *x = (element->type == ACPI_TYPE_INTEGER) ?
 326                                 element->integer.value : -1;
 327                 }
 328         }
 329         return 0;
 330 }
 331
 332 static int acpi_battery_get_status(struct acpi_battery *battery)
 333 {
 334         if (acpi_bus_get_status(battery->device)) {
 335                 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
 336                 return -ENODEV;
 337         }
 338         return 0;
 339 }
 340
 341 static int acpi_battery_get_info(struct acpi_battery *battery)
 342 {
 343         int result = -EFAULT;
 344         acpi_status status = 0;
 345         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 346
 347         if (!acpi_battery_present(battery))
 348                 return 0;
 349         mutex_lock(&battery->lock);
 350         status = acpi_evaluate_object(battery->device->handle, "_BIF",
 351                                       NULL, &buffer);
 352         mutex_unlock(&battery->lock);
 353
 354         if (ACPI_FAILURE(status)) {
 355                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
 356                 return -ENODEV;
 357         }
 358
 359         result = extract_package(battery, buffer.pointer,
 360                                  info_offsets, ARRAY_SIZE(info_offsets));
 361         kfree(buffer.pointer);
 362         return result;
 363 }
 364
 365 static int acpi_battery_get_state(struct acpi_battery *battery)
 366 {
 367         int result = 0;
 368         acpi_status status = 0;
 369         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 370
 371         if (!acpi_battery_present(battery))
 372                 return 0;
 373
 374         if (battery->update_time &&
 375             time_before(jiffies, battery->update_time +
 376                         msecs_to_jiffies(cache_time)))
 377                 return 0;
 378
 379         mutex_lock(&battery->lock);
 380         status = acpi_evaluate_object(battery->device->handle, "_BST",
 381                                       NULL, &buffer);
 382         mutex_unlock(&battery->lock);
 383
 384         if (ACPI_FAILURE(status)) {
 385                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
 386                 return -ENODEV;
 387         }
 388
 389         result = extract_package(battery, buffer.pointer,
 390                                  state_offsets, ARRAY_SIZE(state_offsets));
 391         battery->update_time = jiffies;
 392         kfree(buffer.pointer);
 393         return result;
 394 }
 395
 396 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 397 {
 398         acpi_status status = 0;
 399         union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
 400         struct acpi_object_list arg_list = { 1, &arg0 };
 401
 402         if (!acpi_battery_present(battery)|| !battery->alarm_present)
 403                 return -ENODEV;
 404
 405         arg0.integer.value = battery->alarm;
 406
 407         mutex_lock(&battery->lock);
 408         status = acpi_evaluate_object(battery->device->handle, "_BTP",
 409                                  &arg_list, NULL);
 410         mutex_unlock(&battery->lock);
 411
 412         if (ACPI_FAILURE(status))
 413                 return -ENODEV;
 414
 415         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
 416         return 0;
 417 }
 418
 419 static int acpi_battery_init_alarm(struct acpi_battery *battery)
 420 {
 421         acpi_status status = AE_OK;
 422         acpi_handle handle = NULL;
 423
 424         /* See if alarms are supported, and if so, set default */
 425         status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
 426         if (ACPI_FAILURE(status)) {
 427                 battery->alarm_present = 0;
 428                 return 0;
 429         }
 430         battery->alarm_present = 1;
 431         if (!battery->alarm)
 432                 battery->alarm = battery->design_capacity_warning;
 433         return acpi_battery_set_alarm(battery);
 434 }
 435
 436 #ifdef CONFIG_ACPI_SYSFS_POWER
 437 static ssize_t acpi_battery_alarm_show(struct device *dev,
 438                                         struct device_attribute *attr,
 439                                         char *buf)
 440 {
 441         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 442         return sprintf(buf, "%d\n", battery->alarm * 1000);
 443 }
 444
 445 static ssize_t acpi_battery_alarm_store(struct device *dev,
 446                                         struct device_attribute *attr,
 447                                         const char *buf, size_t count)
 448 {
 449         unsigned long x;
 450         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 451         if (sscanf(buf, "%ld\n", &x) == 1)
 452                 battery->alarm = x/1000;
 453         if (acpi_battery_present(battery))
 454                 acpi_battery_set_alarm(battery);
 455         return count;
 456 }
 457
 458 static struct device_attribute alarm_attr = {
 459         .attr = {.name = "alarm", .mode = 0644},
 460         .show = acpi_battery_alarm_show,
 461         .store = acpi_battery_alarm_store,
 462 };
 463
 464 static int sysfs_add_battery(struct acpi_battery *battery)
 465 {
 466         int result;
 467
 468         if (battery->power_unit) {
 469                 battery->bat.properties = charge_battery_props;
 470                 battery->bat.num_properties =
 471                         ARRAY_SIZE(charge_battery_props);
 472         } else {
 473                 battery->bat.properties = energy_battery_props;
 474                 battery->bat.num_properties =
 475                         ARRAY_SIZE(energy_battery_props);
 476         }
 477
 478         battery->bat.name = acpi_device_bid(battery->device);
 479         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 480         battery->bat.get_property = acpi_battery_get_property;
 481
 482         result = power_supply_register(&battery->device->dev, &battery->bat);
 483         if (result)
 484                 return result;
 485         return device_create_file(battery->bat.dev, &alarm_attr);
 486 }
 487
 488 static void sysfs_remove_battery(struct acpi_battery *battery)
 489 {
 490         if (!battery->bat.dev)
 491                 return;
 492         device_remove_file(battery->bat.dev, &alarm_attr);
 493         power_supply_unregister(&battery->bat);
 494         battery->bat.dev = NULL;
 495 }
 496 #endif
 497
 498 static int acpi_battery_update(struct acpi_battery *battery)
 499 {
 500         int result, old_present = acpi_battery_present(battery);
 501         result = acpi_battery_get_status(battery);
 502         if (result)
 503                 return result;
 504 #ifdef CONFIG_ACPI_SYSFS_POWER
 505         if (!acpi_battery_present(battery)) {
 506                 sysfs_remove_battery(battery);
 507                 battery->update_time = 0;
 508                 return 0;
 509         }
 510 #endif
 511         if (!battery->update_time ||
 512             old_present != acpi_battery_present(battery)) {
 513                 result = acpi_battery_get_info(battery);
 514                 if (result)
 515                         return result;
 516                 acpi_battery_init_alarm(battery);
 517         }
 518 #ifdef CONFIG_ACPI_SYSFS_POWER
 519         if (!battery->bat.dev)
 520                 sysfs_add_battery(battery);
 521 #endif
 522         return acpi_battery_get_state(battery);
 523 }
 524
 525 /* --------------------------------------------------------------------------
 526                               FS Interface (/proc)
 527    -------------------------------------------------------------------------- */
 528
 529 #ifdef CONFIG_ACPI_PROCFS_POWER
 530 static struct proc_dir_entry *acpi_battery_dir;
 531
 532 static int acpi_battery_print_info(struct seq_file *seq, int result)
 533 {
 534         struct acpi_battery *battery = seq->private;
 535
 536         if (result)
 537                 goto end;
 538
 539         seq_printf(seq, "present:                 %s\n",
 540                    acpi_battery_present(battery)?"yes":"no");
 541         if (!acpi_battery_present(battery))
 542                 goto end;
 543         if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 544                 seq_printf(seq, "design capacity:         unknown\n");
 545         else
 546                 seq_printf(seq, "design capacity:         %d %sh\n",
 547                            battery->design_capacity,
 548                            acpi_battery_units(battery));
 549
 550         if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 551                 seq_printf(seq, "last full capacity:      unknown\n");
 552         else
 553                 seq_printf(seq, "last full capacity:      %d %sh\n",
 554                            battery->full_charge_capacity,
 555                            acpi_battery_units(battery));
 556
 557         seq_printf(seq, "battery technology:      %srechargeable\n",
 558                    (!battery->technology)?"non-":"");
 559
 560         if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 561                 seq_printf(seq, "design voltage:          unknown\n");
 562         else
 563                 seq_printf(seq, "design voltage:          %d mV\n",
 564                            battery->design_voltage);
 565         seq_printf(seq, "design capacity warning: %d %sh\n",
 566                    battery->design_capacity_warning,
 567                    acpi_battery_units(battery));
 568         seq_printf(seq, "design capacity low:     %d %sh\n",
 569                    battery->design_capacity_low,
 570                    acpi_battery_units(battery));
 571         seq_printf(seq, "capacity granularity 1:  %d %sh\n",
 572                    battery->capacity_granularity_1,
 573                    acpi_battery_units(battery));
 574         seq_printf(seq, "capacity granularity 2:  %d %sh\n",
 575                    battery->capacity_granularity_2,
 576                    acpi_battery_units(battery));
 577         seq_printf(seq, "model number:            %s\n", battery->model_number);
 578         seq_printf(seq, "serial number:           %s\n", battery->serial_number);
 579         seq_printf(seq, "battery type:            %s\n", battery->type);
 580         seq_printf(seq, "OEM info:                %s\n", battery->oem_info);
 581       end:
 582         if (result)
 583                 seq_printf(seq, "ERROR: Unable to read battery info\n");
 584         return result;
 585 }
 586
 587 static int acpi_battery_print_state(struct seq_file *seq, int result)
 588 {
 589         struct acpi_battery *battery = seq->private;
 590
 591         if (result)
 592                 goto end;
 593
 594         seq_printf(seq, "present:                 %s\n",
 595                    acpi_battery_present(battery)?"yes":"no");
 596         if (!acpi_battery_present(battery))
 597                 goto end;
 598
 599         seq_printf(seq, "capacity state:          %s\n",
 600                         (battery->state & 0x04)?"critical":"ok");
 601         if ((battery->state & 0x01) && (battery->state & 0x02))
 602                 seq_printf(seq,
 603                            "charging state:          charging/discharging\n");
 604         else if (battery->state & 0x01)
 605                 seq_printf(seq, "charging state:          discharging\n");
 606         else if (battery->state & 0x02)
 607                 seq_printf(seq, "charging state:          charging\n");
 608         else
 609                 seq_printf(seq, "charging state:          charged\n");
 610
 611         if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
 612                 seq_printf(seq, "present rate:            unknown\n");
 613         else
 614                 seq_printf(seq, "present rate:            %d %s\n",
 615                            battery->rate_now, acpi_battery_units(battery));
 616
 617         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
 618                 seq_printf(seq, "remaining capacity:      unknown\n");
 619         else
 620                 seq_printf(seq, "remaining capacity:      %d %sh\n",
 621                            battery->capacity_now, acpi_battery_units(battery));
 622         if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
 623                 seq_printf(seq, "present voltage:         unknown\n");
 624         else
 625                 seq_printf(seq, "present voltage:         %d mV\n",
 626                            battery->voltage_now);
 627       end:
 628         if (result)
 629                 seq_printf(seq, "ERROR: Unable to read battery state\n");
 630
 631         return result;
 632 }
 633
 634 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
 635 {
 636         struct acpi_battery *battery = seq->private;
 637
 638         if (result)
 639                 goto end;
 640
 641         if (!acpi_battery_present(battery)) {
 642                 seq_printf(seq, "present:                 no\n");
 643                 goto end;
 644         }
 645         seq_printf(seq, "alarm:                   ");
 646         if (!battery->alarm)
 647                 seq_printf(seq, "unsupported\n");
 648         else
 649                 seq_printf(seq, "%u %sh\n", battery->alarm,
 650                                 acpi_battery_units(battery));
 651       end:
 652         if (result)
 653                 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
 654         return result;
 655 }
 656
 657 static ssize_t acpi_battery_write_alarm(struct file *file,
 658                                         const char __user * buffer,
 659                                         size_t count, loff_t * ppos)
 660 {
 661         int result = 0;
 662         char alarm_string[12] = { '\0' };
 663         struct seq_file *m = file->private_data;
 664         struct acpi_battery *battery = m->private;
 665
 666         if (!battery || (count > sizeof(alarm_string) - 1))
 667                 return -EINVAL;
 668         if (!acpi_battery_present(battery)) {
 669                 result = -ENODEV;
 670                 goto end;
 671         }
 672         if (copy_from_user(alarm_string, buffer, count)) {
 673                 result = -EFAULT;
 674                 goto end;
 675         }
 676         alarm_string[count] = '\0';
 677         battery->alarm = simple_strtol(alarm_string, NULL, 0);
 678         result = acpi_battery_set_alarm(battery);
 679       end:
 680         if (!result)
 681                 return count;
 682         return result;
 683 }
 684
 685 typedef int(*print_func)(struct seq_file *seq, int result);
 686
 687 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
 688         acpi_battery_print_info,
 689         acpi_battery_print_state,
 690         acpi_battery_print_alarm,
 691 };
 692
 693 static int acpi_battery_read(int fid, struct seq_file *seq)
 694 {
 695         struct acpi_battery *battery = seq->private;
 696         int result = acpi_battery_update(battery);
 697         return acpi_print_funcs[fid](seq, result);
 698 }
 699
 700 #define DECLARE_FILE_FUNCTIONS(_name) \
 701 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
 702 { \
 703         return acpi_battery_read(_name##_tag, seq); \
 704 } \
 705 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
 706 { \
 707         return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
 708 }
 709
 710 DECLARE_FILE_FUNCTIONS(info);
 711 DECLARE_FILE_FUNCTIONS(state);
 712 DECLARE_FILE_FUNCTIONS(alarm);
 713
 714 #undef DECLARE_FILE_FUNCTIONS
 715
 716 #define FILE_DESCRIPTION_RO(_name) \
 717         { \
 718         .name = __stringify(_name), \
 719         .mode = S_IRUGO, \
 720         .ops = { \
 721                 .open = acpi_battery_##_name##_open_fs, \
 722                 .read = seq_read, \
 723                 .llseek = seq_lseek, \
 724                 .release = single_release, \
 725                 .owner = THIS_MODULE, \
 726                 }, \
 727         }
 728
 729 #define FILE_DESCRIPTION_RW(_name) \
 730         { \
 731         .name = __stringify(_name), \
 732         .mode = S_IFREG | S_IRUGO | S_IWUSR, \
 733         .ops = { \
 734                 .open = acpi_battery_##_name##_open_fs, \
 735                 .read = seq_read, \
 736                 .llseek = seq_lseek, \
 737                 .write = acpi_battery_write_##_name, \
 738                 .release = single_release, \
 739                 .owner = THIS_MODULE, \
 740                 }, \
 741         }
 742
 743 static struct battery_file {
 744         struct file_operations ops;
 745         mode_t mode;
 746         const char *name;
 747 } acpi_battery_file[] = {
 748         FILE_DESCRIPTION_RO(info),
 749         FILE_DESCRIPTION_RO(state),
 750         FILE_DESCRIPTION_RW(alarm),
 751 };
 752
 753 #undef FILE_DESCRIPTION_RO
 754 #undef FILE_DESCRIPTION_RW
 755
 756 static int acpi_battery_add_fs(struct acpi_device *device)
 757 {
 758         struct proc_dir_entry *entry = NULL;
 759         int i;
 760
 761         if (!acpi_device_dir(device)) {
 762                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 763                                                      acpi_battery_dir);
 764                 if (!acpi_device_dir(device))
 765                         return -ENODEV;
 766         }
 767
 768         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
 769                 entry = proc_create_data(acpi_battery_file[i].name,
 770                                          acpi_battery_file[i].mode,
 771                                          acpi_device_dir(device),
 772                                          &acpi_battery_file[i].ops,
 773                                          acpi_driver_data(device));
 774                 if (!entry)
 775                         return -ENODEV;
 776         }
 777         return 0;
 778 }
 779
 780 static void acpi_battery_remove_fs(struct acpi_device *device)
 781 {
 782         int i;
 783         if (!acpi_device_dir(device))
 784                 return;
 785         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
 786                 remove_proc_entry(acpi_battery_file[i].name,
 787                                   acpi_device_dir(device));
 788
 789         remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
 790         acpi_device_dir(device) = NULL;
 791 }
 792
 793 #endif
 794
 795 /* --------------------------------------------------------------------------
 796                                  Driver Interface
 797    -------------------------------------------------------------------------- */
 798
 799 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
 800 {
 801         struct acpi_battery *battery = data;
 802         struct acpi_device *device;
 803         if (!battery)
 804                 return;
 805         device = battery->device;
 806         acpi_battery_update(battery);
 807         acpi_bus_generate_proc_event(device, event,
 808                                      acpi_battery_present(battery));
 809         acpi_bus_generate_netlink_event(device->pnp.device_class,
 810                                         dev_name(&device->dev), event,
 811                                         acpi_battery_present(battery));
 812 #ifdef CONFIG_ACPI_SYSFS_POWER
 813         /* acpi_batter_update could remove power_supply object */
 814         if (battery->bat.dev)
 815                 kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
 816 #endif
 817 }
 818
 819 static int acpi_battery_add(struct acpi_device *device)
 820 {
 821         int result = 0;
 822         acpi_status status = 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         if (result)
 838                 goto end;
 839 #endif
 840         status = acpi_install_notify_handler(device->handle,
 841                                              ACPI_ALL_NOTIFY,
 842                                              acpi_battery_notify, battery);
 843         if (ACPI_FAILURE(status)) {
 844                 ACPI_EXCEPTION((AE_INFO, status, "Installing notify handler"));
 845                 result = -ENODEV;
 846                 goto end;
 847         }
 848         printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
 849                ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
 850                device->status.battery_present ? "present" : "absent");
 851       end:
 852         if (result) {
 853 #ifdef CONFIG_ACPI_PROCFS_POWER
 854                 acpi_battery_remove_fs(device);
 855 #endif
 856                 kfree(battery);
 857         }
 858         return result;
 859 }
 860
 861 static int acpi_battery_remove(struct acpi_device *device, int type)
 862 {
 863         acpi_status status = 0;
 864         struct acpi_battery *battery = NULL;
 865
 866         if (!device || !acpi_driver_data(device))
 867                 return -EINVAL;
 868         battery = acpi_driver_data(device);
 869         status = acpi_remove_notify_handler(device->handle,
 870                                             ACPI_ALL_NOTIFY,
 871                                             acpi_battery_notify);
 872 #ifdef CONFIG_ACPI_PROCFS_POWER
 873         acpi_battery_remove_fs(device);
 874 #endif
 875 #ifdef CONFIG_ACPI_SYSFS_POWER
 876         sysfs_remove_battery(battery);
 877 #endif
 878         mutex_destroy(&battery->lock);
 879         kfree(battery);
 880         return 0;
 881 }
 882
 883 /* this is needed to learn about changes made in suspended state */
 884 static int acpi_battery_resume(struct acpi_device *device)
 885 {
 886         struct acpi_battery *battery;
 887         if (!device)
 888                 return -EINVAL;
 889         battery = acpi_driver_data(device);
 890         battery->update_time = 0;
 891         acpi_battery_update(battery);
 892         return 0;
 893 }
 894
 895 static struct acpi_driver acpi_battery_driver = {
 896         .name = "battery",
 897         .class = ACPI_BATTERY_CLASS,
 898         .ids = battery_device_ids,
 899         .ops = {
 900                 .add = acpi_battery_add,
 901                 .resume = acpi_battery_resume,
 902                 .remove = acpi_battery_remove,
 903                 },
 904 };
 905
 906 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
 907 {
 908         if (acpi_disabled)
 909                 return;
 910 #ifdef CONFIG_ACPI_PROCFS_POWER
 911         acpi_battery_dir = acpi_lock_battery_dir();
 912         if (!acpi_battery_dir)
 913                 return;
 914 #endif
 915         if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
 916 #ifdef CONFIG_ACPI_PROCFS_POWER
 917                 acpi_unlock_battery_dir(acpi_battery_dir);
 918 #endif
 919                 return;
 920         }
 921         return;
 922 }
 923
 924 static int __init acpi_battery_init(void)
 925 {
 926         async_schedule(acpi_battery_init_async, NULL);
 927         return 0;
 928 }
 929
 930 static void __exit acpi_battery_exit(void)
 931 {
 932         acpi_bus_unregister_driver(&acpi_battery_driver);
 933 #ifdef CONFIG_ACPI_PROCFS_POWER
 934         acpi_unlock_battery_dir(acpi_battery_dir);
 935 #endif
 936 }
 937
 938 module_init(acpi_battery_init);
 939 module_exit(acpi_battery_exit);