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