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   1 /*
   2  *  battery.c - ACPI Battery Driver (Revision: 2.0)
   3  *
   4  *  Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
   5  *  Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
   6  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   7  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   8  *
   9  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  10  *
  11  *  This program is free software; you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License as published by
  13  *  the Free Software Foundation; either version 2 of the License, or (at
  14  *  your option) any later version.
  15  *
  16  *  This program is distributed in the hope that it will be useful, but
  17  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  *  General Public License for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License along
  22  *  with this program; if not, write to the Free Software Foundation, Inc.,
  23  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  24  *
  25  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  26  */
  27
  28 #include <linux/kernel.h>
  29 #include <linux/module.h>
  30 #include <linux/init.h>
  31 #include <linux/types.h>
  32 #include <linux/jiffies.h>
  33
  34 #ifdef CONFIG_ACPI_PROCFS
  35 #include <linux/proc_fs.h>
  36 #include <linux/seq_file.h>
  37 #include <asm/uaccess.h>
  38 #endif
  39
  40 #include <acpi/acpi_bus.h>
  41 #include <acpi/acpi_drivers.h>
  42
  43 #include <linux/power_supply.h>
  44
  45 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
  46
  47 #define ACPI_BATTERY_COMPONENT          0x00040000
  48 #define ACPI_BATTERY_CLASS              "battery"
  49 #define ACPI_BATTERY_DEVICE_NAME        "Battery"
  50 #define ACPI_BATTERY_NOTIFY_STATUS      0x80
  51 #define ACPI_BATTERY_NOTIFY_INFO        0x81
  52
  53 #define _COMPONENT              ACPI_BATTERY_COMPONENT
  54
  55 ACPI_MODULE_NAME("battery");
  56
  57 MODULE_AUTHOR("Paul Diefenbaugh");
  58 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
  59 MODULE_DESCRIPTION("ACPI Battery Driver");
  60 MODULE_LICENSE("GPL");
  61
  62 static unsigned int cache_time = 1000;
  63 module_param(cache_time, uint, 0644);
  64 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  65
  66 #ifdef CONFIG_ACPI_PROCFS
  67 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
  68 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
  69
  70 enum acpi_battery_files {
  71         info_tag = 0,
  72         state_tag,
  73         alarm_tag,
  74         ACPI_BATTERY_NUMFILES,
  75 };
  76
  77 #endif
  78
  79 static const struct acpi_device_id battery_device_ids[] = {
  80         {"PNP0C0A", 0},
  81         {"", 0},
  82 };
  83
  84 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
  85
  86
  87 struct acpi_battery {
  88         struct mutex lock;
  89         struct power_supply bat;
  90         struct acpi_device *device;
  91         unsigned long update_time;
  92         int current_now;
  93         int capacity_now;
  94         int voltage_now;
  95         int design_capacity;
  96         int full_charge_capacity;
  97         int technology;
  98         int design_voltage;
  99         int design_capacity_warning;
 100         int design_capacity_low;
 101         int capacity_granularity_1;
 102         int capacity_granularity_2;
 103         int alarm;
 104         char model_number[32];
 105         char serial_number[32];
 106         char type[32];
 107         char oem_info[32];
 108         int state;
 109         int power_unit;
 110         u8 alarm_present;
 111 };
 112
 113 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
 114
 115 inline int acpi_battery_present(struct acpi_battery *battery)
 116 {
 117         return battery->device->status.battery_present;
 118 }
 119
 120 static int acpi_battery_technology(struct acpi_battery *battery)
 121 {
 122         if (!strcasecmp("NiCd", battery->type))
 123                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 124         if (!strcasecmp("NiMH", battery->type))
 125                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 126         if (!strcasecmp("LION", battery->type))
 127                 return POWER_SUPPLY_TECHNOLOGY_LION;
 128         if (!strcasecmp("LiP", battery->type))
 129                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 130         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 131 }
 132
 133 static int acpi_battery_get_property(struct power_supply *psy,
 134                                      enum power_supply_property psp,
 135                                      union power_supply_propval *val)
 136 {
 137         struct acpi_battery *battery = to_acpi_battery(psy);
 138
 139         if ((!acpi_battery_present(battery)) &&
 140              psp != POWER_SUPPLY_PROP_PRESENT)
 141                 return -ENODEV;
 142         switch (psp) {
 143         case POWER_SUPPLY_PROP_STATUS:
 144                 if (battery->state & 0x01)
 145                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 146                 else if (battery->state & 0x02)
 147                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 148                 else if (battery->state == 0)
 149                         val->intval = POWER_SUPPLY_STATUS_FULL;
 150                 break;
 151         case POWER_SUPPLY_PROP_PRESENT:
 152                 val->intval = acpi_battery_present(battery);
 153                 break;
 154         case POWER_SUPPLY_PROP_TECHNOLOGY:
 155                 val->intval = acpi_battery_technology(battery);
 156                 break;
 157         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 158                 val->intval = battery->design_voltage * 1000;
 159                 break;
 160         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 161                 val->intval = battery->voltage_now * 1000;
 162                 break;
 163         case POWER_SUPPLY_PROP_CURRENT_NOW:
 164                 val->intval = battery->current_now * 1000;
 165                 break;
 166         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 167         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 168                 val->intval = battery->design_capacity * 1000;
 169                 break;
 170         case POWER_SUPPLY_PROP_CHARGE_FULL:
 171         case POWER_SUPPLY_PROP_ENERGY_FULL:
 172                 val->intval = battery->full_charge_capacity * 1000;
 173                 break;
 174         case POWER_SUPPLY_PROP_CHARGE_NOW:
 175         case POWER_SUPPLY_PROP_ENERGY_NOW:
 176                 val->intval = battery->capacity_now * 1000;
 177                 break;
 178         case POWER_SUPPLY_PROP_MODEL_NAME:
 179                 val->strval = battery->model_number;
 180                 break;
 181         case POWER_SUPPLY_PROP_MANUFACTURER:
 182                 val->strval = battery->oem_info;
 183                 break;
 184         default:
 185                 return -EINVAL;
 186         }
 187         return 0;
 188 }
 189
 190 static enum power_supply_property charge_battery_props[] = {
 191         POWER_SUPPLY_PROP_STATUS,
 192         POWER_SUPPLY_PROP_PRESENT,
 193         POWER_SUPPLY_PROP_TECHNOLOGY,
 194         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 195         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 196         POWER_SUPPLY_PROP_CURRENT_NOW,
 197         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 198         POWER_SUPPLY_PROP_CHARGE_FULL,
 199         POWER_SUPPLY_PROP_CHARGE_NOW,
 200         POWER_SUPPLY_PROP_MODEL_NAME,
 201         POWER_SUPPLY_PROP_MANUFACTURER,
 202 };
 203
 204 static enum power_supply_property energy_battery_props[] = {
 205         POWER_SUPPLY_PROP_STATUS,
 206         POWER_SUPPLY_PROP_PRESENT,
 207         POWER_SUPPLY_PROP_TECHNOLOGY,
 208         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 209         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 210         POWER_SUPPLY_PROP_CURRENT_NOW,
 211         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 212         POWER_SUPPLY_PROP_ENERGY_FULL,
 213         POWER_SUPPLY_PROP_ENERGY_NOW,
 214         POWER_SUPPLY_PROP_MODEL_NAME,
 215         POWER_SUPPLY_PROP_MANUFACTURER,
 216 };
 217
 218 #ifdef CONFIG_ACPI_PROCFS
 219 inline char *acpi_battery_units(struct acpi_battery *battery)
 220 {
 221         return (battery->power_unit)?"mA":"mW";
 222 }
 223 #endif
 224
 225 /* --------------------------------------------------------------------------
 226                                Battery Management
 227    -------------------------------------------------------------------------- */
 228 struct acpi_offsets {
 229         size_t offset;          /* offset inside struct acpi_sbs_battery */
 230         u8 mode;                /* int or string? */
 231 };
 232
 233 static struct acpi_offsets state_offsets[] = {
 234         {offsetof(struct acpi_battery, state), 0},
 235         {offsetof(struct acpi_battery, current_now), 0},
 236         {offsetof(struct acpi_battery, capacity_now), 0},
 237         {offsetof(struct acpi_battery, voltage_now), 0},
 238 };
 239
 240 static struct acpi_offsets info_offsets[] = {
 241         {offsetof(struct acpi_battery, power_unit), 0},
 242         {offsetof(struct acpi_battery, design_capacity), 0},
 243         {offsetof(struct acpi_battery, full_charge_capacity), 0},
 244         {offsetof(struct acpi_battery, technology), 0},
 245         {offsetof(struct acpi_battery, design_voltage), 0},
 246         {offsetof(struct acpi_battery, design_capacity_warning), 0},
 247         {offsetof(struct acpi_battery, design_capacity_low), 0},
 248         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
 249         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
 250         {offsetof(struct acpi_battery, model_number), 1},
 251         {offsetof(struct acpi_battery, serial_number), 1},
 252         {offsetof(struct acpi_battery, type), 1},
 253         {offsetof(struct acpi_battery, oem_info), 1},
 254 };
 255
 256 static int extract_package(struct acpi_battery *battery,
 257                            union acpi_object *package,
 258                            struct acpi_offsets *offsets, int num)
 259 {
 260         int i, *x;
 261         union acpi_object *element;
 262         if (package->type != ACPI_TYPE_PACKAGE)
 263                 return -EFAULT;
 264         for (i = 0; i < num; ++i) {
 265                 if (package->package.count <= i)
 266                         return -EFAULT;
 267                 element = &package->package.elements[i];
 268                 if (offsets[i].mode) {
 269                         if (element->type != ACPI_TYPE_STRING &&
 270                             element->type != ACPI_TYPE_BUFFER)
 271                                 return -EFAULT;
 272                         strncpy((u8 *)battery + offsets[i].offset,
 273                                 element->string.pointer, 32);
 274                 } else {
 275                         if (element->type != ACPI_TYPE_INTEGER)
 276                                 return -EFAULT;
 277                         x = (int *)((u8 *)battery + offsets[i].offset);
 278                         *x = element->integer.value;
 279                 }
 280         }
 281         return 0;
 282 }
 283
 284 static int acpi_battery_get_status(struct acpi_battery *battery)
 285 {
 286         if (acpi_bus_get_status(battery->device)) {
 287                 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
 288                 return -ENODEV;
 289         }
 290         return 0;
 291 }
 292
 293 static int acpi_battery_get_info(struct acpi_battery *battery)
 294 {
 295         int result = -EFAULT;
 296         acpi_status status = 0;
 297         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 298
 299         if (!acpi_battery_present(battery))
 300                 return 0;
 301         mutex_lock(&battery->lock);
 302         status = acpi_evaluate_object(battery->device->handle, "_BIF",
 303                                       NULL, &buffer);
 304         mutex_unlock(&battery->lock);
 305
 306         if (ACPI_FAILURE(status)) {
 307                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
 308                 return -ENODEV;
 309         }
 310
 311         result = extract_package(battery, buffer.pointer,
 312                                  info_offsets, ARRAY_SIZE(info_offsets));
 313         kfree(buffer.pointer);
 314         return result;
 315 }
 316
 317 static int acpi_battery_get_state(struct acpi_battery *battery)
 318 {
 319         int result = 0;
 320         acpi_status status = 0;
 321         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 322
 323         if (!acpi_battery_present(battery))
 324                 return 0;
 325
 326         if (battery->update_time &&
 327             time_before(jiffies, battery->update_time +
 328                         msecs_to_jiffies(cache_time)))
 329                 return 0;
 330
 331         mutex_lock(&battery->lock);
 332         status = acpi_evaluate_object(battery->device->handle, "_BST",
 333                                       NULL, &buffer);
 334         mutex_unlock(&battery->lock);
 335
 336         if (ACPI_FAILURE(status)) {
 337                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
 338                 return -ENODEV;
 339         }
 340
 341         result = extract_package(battery, buffer.pointer,
 342                                  state_offsets, ARRAY_SIZE(state_offsets));
 343         battery->update_time = jiffies;
 344         kfree(buffer.pointer);
 345         return result;
 346 }
 347
 348 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 349 {
 350         acpi_status status = 0;
 351         union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
 352         struct acpi_object_list arg_list = { 1, &arg0 };
 353
 354         if (!acpi_battery_present(battery)|| !battery->alarm_present)
 355                 return -ENODEV;
 356
 357         arg0.integer.value = battery->alarm;
 358
 359         mutex_lock(&battery->lock);
 360         status = acpi_evaluate_object(battery->device->handle, "_BTP",
 361                                  &arg_list, NULL);
 362         mutex_unlock(&battery->lock);
 363
 364         if (ACPI_FAILURE(status))
 365                 return -ENODEV;
 366
 367         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
 368         return 0;
 369 }
 370
 371 static int acpi_battery_init_alarm(struct acpi_battery *battery)
 372 {
 373         acpi_status status = AE_OK;
 374         acpi_handle handle = NULL;
 375
 376         /* See if alarms are supported, and if so, set default */
 377         status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
 378         if (ACPI_FAILURE(status)) {
 379                 battery->alarm_present = 0;
 380                 return 0;
 381         }
 382         battery->alarm_present = 1;
 383         if (!battery->alarm)
 384                 battery->alarm = battery->design_capacity_warning;
 385         return acpi_battery_set_alarm(battery);
 386 }
 387
 388 static int acpi_battery_update(struct acpi_battery *battery)
 389 {
 390         int saved_present = acpi_battery_present(battery);
 391         int result = acpi_battery_get_status(battery);
 392         if (result || !acpi_battery_present(battery))
 393                 return result;
 394         if (saved_present != acpi_battery_present(battery) ||
 395             !battery->update_time) {
 396                 battery->update_time = 0;
 397                 result = acpi_battery_get_info(battery);
 398                 if (result)
 399                         return result;
 400                 if (battery->power_unit) {
 401                         battery->bat.properties = charge_battery_props;
 402                         battery->bat.num_properties =
 403                                 ARRAY_SIZE(charge_battery_props);
 404                 } else {
 405                         battery->bat.properties = energy_battery_props;
 406                         battery->bat.num_properties =
 407                                 ARRAY_SIZE(energy_battery_props);
 408                 }
 409                 acpi_battery_init_alarm(battery);
 410         }
 411         return acpi_battery_get_state(battery);
 412 }
 413
 414 /* --------------------------------------------------------------------------
 415                               FS Interface (/proc)
 416    -------------------------------------------------------------------------- */
 417
 418 #ifdef CONFIG_ACPI_PROCFS
 419 static struct proc_dir_entry *acpi_battery_dir;
 420
 421 static int acpi_battery_print_info(struct seq_file *seq, int result)
 422 {
 423         struct acpi_battery *battery = seq->private;
 424
 425         if (result)
 426                 goto end;
 427
 428         seq_printf(seq, "present:                 %s\n",
 429                    acpi_battery_present(battery)?"yes":"no");
 430         if (!acpi_battery_present(battery))
 431                 goto end;
 432         if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 433                 seq_printf(seq, "design capacity:         unknown\n");
 434         else
 435                 seq_printf(seq, "design capacity:         %d %sh\n",
 436                            battery->design_capacity,
 437                            acpi_battery_units(battery));
 438
 439         if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 440                 seq_printf(seq, "last full capacity:      unknown\n");
 441         else
 442                 seq_printf(seq, "last full capacity:      %d %sh\n",
 443                            battery->full_charge_capacity,
 444                            acpi_battery_units(battery));
 445
 446         seq_printf(seq, "battery technology:      %srechargeable\n",
 447                    (!battery->technology)?"non-":"");
 448
 449         if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 450                 seq_printf(seq, "design voltage:          unknown\n");
 451         else
 452                 seq_printf(seq, "design voltage:          %d mV\n",
 453                            battery->design_voltage);
 454         seq_printf(seq, "design capacity warning: %d %sh\n",
 455                    battery->design_capacity_warning,
 456                    acpi_battery_units(battery));
 457         seq_printf(seq, "design capacity low:     %d %sh\n",
 458                    battery->design_capacity_low,
 459                    acpi_battery_units(battery));
 460         seq_printf(seq, "capacity granularity 1:  %d %sh\n",
 461                    battery->capacity_granularity_1,
 462                    acpi_battery_units(battery));
 463         seq_printf(seq, "capacity granularity 2:  %d %sh\n",
 464                    battery->capacity_granularity_2,
 465                    acpi_battery_units(battery));
 466         seq_printf(seq, "model number:            %s\n", battery->model_number);
 467         seq_printf(seq, "serial number:           %s\n", battery->serial_number);
 468         seq_printf(seq, "battery type:            %s\n", battery->type);
 469         seq_printf(seq, "OEM info:                %s\n", battery->oem_info);
 470       end:
 471         if (result)
 472                 seq_printf(seq, "ERROR: Unable to read battery info\n");
 473         return result;
 474 }
 475
 476 static int acpi_battery_print_state(struct seq_file *seq, int result)
 477 {
 478         struct acpi_battery *battery = seq->private;
 479
 480         if (result)
 481                 goto end;
 482
 483         seq_printf(seq, "present:                 %s\n",
 484                    acpi_battery_present(battery)?"yes":"no");
 485         if (!acpi_battery_present(battery))
 486                 goto end;
 487
 488         seq_printf(seq, "capacity state:          %s\n",
 489                         (battery->state & 0x04)?"critical":"ok");
 490         if ((battery->state & 0x01) && (battery->state & 0x02))
 491                 seq_printf(seq,
 492                            "charging state:          charging/discharging\n");
 493         else if (battery->state & 0x01)
 494                 seq_printf(seq, "charging state:          discharging\n");
 495         else if (battery->state & 0x02)
 496                 seq_printf(seq, "charging state:          charging\n");
 497         else
 498                 seq_printf(seq, "charging state:          charged\n");
 499
 500         if (battery->current_now == ACPI_BATTERY_VALUE_UNKNOWN)
 501                 seq_printf(seq, "present rate:            unknown\n");
 502         else
 503                 seq_printf(seq, "present rate:            %d %s\n",
 504                            battery->current_now, acpi_battery_units(battery));
 505
 506         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
 507                 seq_printf(seq, "remaining capacity:      unknown\n");
 508         else
 509                 seq_printf(seq, "remaining capacity:      %d %sh\n",
 510                            battery->capacity_now, acpi_battery_units(battery));
 511         if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
 512                 seq_printf(seq, "present voltage:         unknown\n");
 513         else
 514                 seq_printf(seq, "present voltage:         %d mV\n",
 515                            battery->voltage_now);
 516       end:
 517         if (result)
 518                 seq_printf(seq, "ERROR: Unable to read battery state\n");
 519
 520         return result;
 521 }
 522
 523 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
 524 {
 525         struct acpi_battery *battery = seq->private;
 526
 527         if (result)
 528                 goto end;
 529
 530         if (!acpi_battery_present(battery)) {
 531                 seq_printf(seq, "present:                 no\n");
 532                 goto end;
 533         }
 534         seq_printf(seq, "alarm:                   ");
 535         if (!battery->alarm)
 536                 seq_printf(seq, "unsupported\n");
 537         else
 538                 seq_printf(seq, "%u %sh\n", battery->alarm,
 539                                 acpi_battery_units(battery));
 540       end:
 541         if (result)
 542                 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
 543         return result;
 544 }
 545
 546 static ssize_t acpi_battery_write_alarm(struct file *file,
 547                                         const char __user * buffer,
 548                                         size_t count, loff_t * ppos)
 549 {
 550         int result = 0;
 551         char alarm_string[12] = { '\0' };
 552         struct seq_file *m = file->private_data;
 553         struct acpi_battery *battery = m->private;
 554
 555         if (!battery || (count > sizeof(alarm_string) - 1))
 556                 return -EINVAL;
 557         if (result) {
 558                 result = -ENODEV;
 559                 goto end;
 560         }
 561         if (!acpi_battery_present(battery)) {
 562                 result = -ENODEV;
 563                 goto end;
 564         }
 565         if (copy_from_user(alarm_string, buffer, count)) {
 566                 result = -EFAULT;
 567                 goto end;
 568         }
 569         alarm_string[count] = '\0';
 570         battery->alarm = simple_strtol(alarm_string, NULL, 0);
 571         result = acpi_battery_set_alarm(battery);
 572       end:
 573         if (!result)
 574                 return count;
 575         return result;
 576 }
 577
 578 typedef int(*print_func)(struct seq_file *seq, int result);
 579
 580 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
 581         acpi_battery_print_info,
 582         acpi_battery_print_state,
 583         acpi_battery_print_alarm,
 584 };
 585
 586 static int acpi_battery_read(int fid, struct seq_file *seq)
 587 {
 588         struct acpi_battery *battery = seq->private;
 589         int result = acpi_battery_update(battery);
 590         return acpi_print_funcs[fid](seq, result);
 591 }
 592
 593 #define DECLARE_FILE_FUNCTIONS(_name) \
 594 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
 595 { \
 596         return acpi_battery_read(_name##_tag, seq); \
 597 } \
 598 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
 599 { \
 600         return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
 601 }
 602
 603 DECLARE_FILE_FUNCTIONS(info);
 604 DECLARE_FILE_FUNCTIONS(state);
 605 DECLARE_FILE_FUNCTIONS(alarm);
 606
 607 #undef DECLARE_FILE_FUNCTIONS
 608
 609 #define FILE_DESCRIPTION_RO(_name) \
 610         { \
 611         .name = __stringify(_name), \
 612         .mode = S_IRUGO, \
 613         .ops = { \
 614                 .open = acpi_battery_##_name##_open_fs, \
 615                 .read = seq_read, \
 616                 .llseek = seq_lseek, \
 617                 .release = single_release, \
 618                 .owner = THIS_MODULE, \
 619                 }, \
 620         }
 621
 622 #define FILE_DESCRIPTION_RW(_name) \
 623         { \
 624         .name = __stringify(_name), \
 625         .mode = S_IFREG | S_IRUGO | S_IWUSR, \
 626         .ops = { \
 627                 .open = acpi_battery_##_name##_open_fs, \
 628                 .read = seq_read, \
 629                 .llseek = seq_lseek, \
 630                 .write = acpi_battery_write_##_name, \
 631                 .release = single_release, \
 632                 .owner = THIS_MODULE, \
 633                 }, \
 634         }
 635
 636 static struct battery_file {
 637         struct file_operations ops;
 638         mode_t mode;
 639         char *name;
 640 } acpi_battery_file[] = {
 641         FILE_DESCRIPTION_RO(info),
 642         FILE_DESCRIPTION_RO(state),
 643         FILE_DESCRIPTION_RW(alarm),
 644 };
 645
 646 #undef FILE_DESCRIPTION_RO
 647 #undef FILE_DESCRIPTION_RW
 648
 649 static int acpi_battery_add_fs(struct acpi_device *device)
 650 {
 651         struct proc_dir_entry *entry = NULL;
 652         int i;
 653
 654         if (!acpi_device_dir(device)) {
 655                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 656                                                      acpi_battery_dir);
 657                 if (!acpi_device_dir(device))
 658                         return -ENODEV;
 659                 acpi_device_dir(device)->owner = THIS_MODULE;
 660         }
 661
 662         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
 663                 entry = create_proc_entry(acpi_battery_file[i].name,
 664                                   acpi_battery_file[i].mode, acpi_device_dir(device));
 665                 if (!entry)
 666                         return -ENODEV;
 667                 else {
 668                         entry->proc_fops = &acpi_battery_file[i].ops;
 669                         entry->data = acpi_driver_data(device);
 670                         entry->owner = THIS_MODULE;
 671                 }
 672         }
 673         return 0;
 674 }
 675
 676 static void acpi_battery_remove_fs(struct acpi_device *device)
 677 {
 678         int i;
 679         if (!acpi_device_dir(device))
 680                 return;
 681         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
 682                 remove_proc_entry(acpi_battery_file[i].name,
 683                                   acpi_device_dir(device));
 684
 685         remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
 686         acpi_device_dir(device) = NULL;
 687 }
 688
 689 #endif
 690
 691 static ssize_t acpi_battery_alarm_show(struct device *dev,
 692                                         struct device_attribute *attr,
 693                                         char *buf)
 694 {
 695         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 696         return sprintf(buf, "%d\n", battery->alarm * 1000);
 697 }
 698
 699 static ssize_t acpi_battery_alarm_store(struct device *dev,
 700                                         struct device_attribute *attr,
 701                                         const char *buf, size_t count)
 702 {
 703         unsigned long x;
 704         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 705         if (sscanf(buf, "%ld\n", &x) == 1)
 706                 battery->alarm = x/1000;
 707         if (acpi_battery_present(battery))
 708                 acpi_battery_set_alarm(battery);
 709         return count;
 710 }
 711
 712 static struct device_attribute alarm_attr = {
 713         .attr = {.name = "alarm", .mode = 0644, .owner = THIS_MODULE},
 714         .show = acpi_battery_alarm_show,
 715         .store = acpi_battery_alarm_store,
 716 };
 717
 718 /* --------------------------------------------------------------------------
 719                                  Driver Interface
 720    -------------------------------------------------------------------------- */
 721
 722 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
 723 {
 724         struct acpi_battery *battery = data;
 725         struct acpi_device *device;
 726         if (!battery)
 727                 return;
 728         device = battery->device;
 729         acpi_battery_update(battery);
 730         acpi_bus_generate_proc_event(device, event,
 731                                      acpi_battery_present(battery));
 732         acpi_bus_generate_netlink_event(device->pnp.device_class,
 733                                         device->dev.bus_id, event,
 734                                         acpi_battery_present(battery));
 735         kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
 736 }
 737
 738 static int acpi_battery_add(struct acpi_device *device)
 739 {
 740         int result = 0;
 741         acpi_status status = 0;
 742         struct acpi_battery *battery = NULL;
 743         if (!device)
 744                 return -EINVAL;
 745         battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
 746         if (!battery)
 747                 return -ENOMEM;
 748         battery->device = device;
 749         strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
 750         strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
 751         acpi_driver_data(device) = battery;
 752         mutex_init(&battery->lock);
 753         acpi_battery_update(battery);
 754 #ifdef CONFIG_ACPI_PROCFS
 755         result = acpi_battery_add_fs(device);
 756         if (result)
 757                 goto end;
 758 #endif
 759         battery->bat.name = acpi_device_bid(device);
 760         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 761         battery->bat.get_property = acpi_battery_get_property;
 762         result = power_supply_register(&battery->device->dev, &battery->bat);
 763         result = device_create_file(battery->bat.dev, &alarm_attr);
 764         status = acpi_install_notify_handler(device->handle,
 765                                              ACPI_ALL_NOTIFY,
 766                                              acpi_battery_notify, battery);
 767         if (ACPI_FAILURE(status)) {
 768                 ACPI_EXCEPTION((AE_INFO, status, "Installing notify handler"));
 769                 result = -ENODEV;
 770                 goto end;
 771         }
 772         printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
 773                ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
 774                device->status.battery_present ? "present" : "absent");
 775       end:
 776         if (result) {
 777 #ifdef CONFIG_ACPI_PROCFS
 778                 acpi_battery_remove_fs(device);
 779 #endif
 780                 kfree(battery);
 781         }
 782         return result;
 783 }
 784
 785 static int acpi_battery_remove(struct acpi_device *device, int type)
 786 {
 787         acpi_status status = 0;
 788         struct acpi_battery *battery = NULL;
 789
 790         if (!device || !acpi_driver_data(device))
 791                 return -EINVAL;
 792         battery = acpi_driver_data(device);
 793         status = acpi_remove_notify_handler(device->handle,
 794                                             ACPI_ALL_NOTIFY,
 795                                             acpi_battery_notify);
 796 #ifdef CONFIG_ACPI_PROCFS
 797         acpi_battery_remove_fs(device);
 798 #endif
 799         if (battery->bat.dev) {
 800                 device_remove_file(battery->bat.dev, &alarm_attr);
 801                 power_supply_unregister(&battery->bat);
 802         }
 803         mutex_destroy(&battery->lock);
 804         kfree(battery);
 805         return 0;
 806 }
 807
 808 /* this is needed to learn about changes made in suspended state */
 809 static int acpi_battery_resume(struct acpi_device *device)
 810 {
 811         struct acpi_battery *battery;
 812         if (!device)
 813                 return -EINVAL;
 814         battery = acpi_driver_data(device);
 815         battery->update_time = 0;
 816         return 0;
 817 }
 818
 819 static struct acpi_driver acpi_battery_driver = {
 820         .name = "battery",
 821         .class = ACPI_BATTERY_CLASS,
 822         .ids = battery_device_ids,
 823         .ops = {
 824                 .add = acpi_battery_add,
 825                 .resume = acpi_battery_resume,
 826                 .remove = acpi_battery_remove,
 827                 },
 828 };
 829
 830 static int __init acpi_battery_init(void)
 831 {
 832         if (acpi_disabled)
 833                 return -ENODEV;
 834 #ifdef CONFIG_ACPI_PROCFS
 835         acpi_battery_dir = acpi_lock_battery_dir();
 836         if (!acpi_battery_dir)
 837                 return -ENODEV;
 838 #endif
 839         if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
 840 #ifdef CONFIG_ACPI_PROCFS
 841                 acpi_unlock_battery_dir(acpi_battery_dir);
 842 #endif
 843                 return -ENODEV;
 844         }
 845         return 0;
 846 }
 847
 848 static void __exit acpi_battery_exit(void)
 849 {
 850         acpi_bus_unregister_driver(&acpi_battery_driver);
 851 #ifdef CONFIG_ACPI_PROCFS
 852         acpi_unlock_battery_dir(acpi_battery_dir);
 853 #endif
 854 }
 855
 856 module_init(acpi_battery_init);
 857 module_exit(acpi_battery_exit);