drivers/acpi/battery.c

   1 /*
   2  *  acpi_battery.c - ACPI Battery Driver ($Revision: 37 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/types.h>
  30 #include <linux/proc_fs.h>
  31 #include <linux/seq_file.h>
  32 #include <asm/uaccess.h>
  33
  34 #include <acpi/acpi_bus.h>
  35 #include <acpi/acpi_drivers.h>
  36
  37 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
  38
  39 #define ACPI_BATTERY_FORMAT_BIF "NNNNNNNNNSSSS"
  40 #define ACPI_BATTERY_FORMAT_BST "NNNN"
  41
  42 #define ACPI_BATTERY_COMPONENT          0x00040000
  43 #define ACPI_BATTERY_CLASS              "battery"
  44 #define ACPI_BATTERY_HID                "PNP0C0A"
  45 #define ACPI_BATTERY_DRIVER_NAME        "ACPI Battery Driver"
  46 #define ACPI_BATTERY_DEVICE_NAME        "Battery"
  47 #define ACPI_BATTERY_FILE_INFO          "info"
  48 #define ACPI_BATTERY_FILE_STATUS        "state"
  49 #define ACPI_BATTERY_FILE_ALARM         "alarm"
  50 #define ACPI_BATTERY_NOTIFY_STATUS      0x80
  51 #define ACPI_BATTERY_NOTIFY_INFO        0x81
  52 #define ACPI_BATTERY_UNITS_WATTS        "mW"
  53 #define ACPI_BATTERY_UNITS_AMPS         "mA"
  54
  55 #define _COMPONENT              ACPI_BATTERY_COMPONENT
  56 ACPI_MODULE_NAME("acpi_battery")
  57
  58     MODULE_AUTHOR("Paul Diefenbaugh");
  59 MODULE_DESCRIPTION(ACPI_BATTERY_DRIVER_NAME);
  60 MODULE_LICENSE("GPL");
  61
  62 static int acpi_battery_add(struct acpi_device *device);
  63 static int acpi_battery_remove(struct acpi_device *device, int type);
  64
  65 static struct acpi_driver acpi_battery_driver = {
  66         .name = ACPI_BATTERY_DRIVER_NAME,
  67         .class = ACPI_BATTERY_CLASS,
  68         .ids = ACPI_BATTERY_HID,
  69         .ops = {
  70                 .add = acpi_battery_add,
  71                 .remove = acpi_battery_remove,
  72                 },
  73 };
  74
  75 struct acpi_battery_status {
  76         acpi_integer state;
  77         acpi_integer present_rate;
  78         acpi_integer remaining_capacity;
  79         acpi_integer present_voltage;
  80 };
  81
  82 struct acpi_battery_info {
  83         acpi_integer power_unit;
  84         acpi_integer design_capacity;
  85         acpi_integer last_full_capacity;
  86         acpi_integer battery_technology;
  87         acpi_integer design_voltage;
  88         acpi_integer design_capacity_warning;
  89         acpi_integer design_capacity_low;
  90         acpi_integer battery_capacity_granularity_1;
  91         acpi_integer battery_capacity_granularity_2;
  92         acpi_string model_number;
  93         acpi_string serial_number;
  94         acpi_string battery_type;
  95         acpi_string oem_info;
  96 };
  97
  98 struct acpi_battery_flags {
  99         u8 present:1;           /* Bay occupied? */
 100         u8 power_unit:1;        /* 0=watts, 1=apms */
 101         u8 alarm:1;             /* _BTP present? */
 102         u8 reserved:5;
 103 };
 104
 105 struct acpi_battery_trips {
 106         unsigned long warning;
 107         unsigned long low;
 108 };
 109
 110 struct acpi_battery {
 111         struct acpi_device * device;
 112         struct acpi_battery_flags flags;
 113         struct acpi_battery_trips trips;
 114         unsigned long alarm;
 115         struct acpi_battery_info *info;
 116 };
 117
 118 /* --------------------------------------------------------------------------
 119                                Battery Management
 120    -------------------------------------------------------------------------- */
 121
 122 static int
 123 acpi_battery_get_info(struct acpi_battery *battery,
 124                       struct acpi_battery_info **bif)
 125 {
 126         int result = 0;
 127         acpi_status status = 0;
 128         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 129         struct acpi_buffer format = { sizeof(ACPI_BATTERY_FORMAT_BIF),
 130                 ACPI_BATTERY_FORMAT_BIF
 131         };
 132         struct acpi_buffer data = { 0, NULL };
 133         union acpi_object *package = NULL;
 134
 135
 136         if (!battery || !bif)
 137                 return -EINVAL;
 138
 139         /* Evalute _BIF */
 140
 141         status = acpi_evaluate_object(battery->device->handle, "_BIF", NULL, &buffer);
 142         if (ACPI_FAILURE(status)) {
 143                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
 144                 return -ENODEV;
 145         }
 146
 147         package = (union acpi_object *)buffer.pointer;
 148
 149         /* Extract Package Data */
 150
 151         status = acpi_extract_package(package, &format, &data);
 152         if (status != AE_BUFFER_OVERFLOW) {
 153                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _BIF"));
 154                 result = -ENODEV;
 155                 goto end;
 156         }
 157
 158         data.pointer = kmalloc(data.length, GFP_KERNEL);
 159         if (!data.pointer) {
 160                 result = -ENOMEM;
 161                 goto end;
 162         }
 163         memset(data.pointer, 0, data.length);
 164
 165         status = acpi_extract_package(package, &format, &data);
 166         if (ACPI_FAILURE(status)) {
 167                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _BIF"));
 168                 kfree(data.pointer);
 169                 result = -ENODEV;
 170                 goto end;
 171         }
 172
 173       end:
 174         kfree(buffer.pointer);
 175
 176         if (!result)
 177                 (*bif) = (struct acpi_battery_info *)data.pointer;
 178
 179         return result;
 180 }
 181
 182 static int
 183 acpi_battery_get_status(struct acpi_battery *battery,
 184                         struct acpi_battery_status **bst)
 185 {
 186         int result = 0;
 187         acpi_status status = 0;
 188         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 189         struct acpi_buffer format = { sizeof(ACPI_BATTERY_FORMAT_BST),
 190                 ACPI_BATTERY_FORMAT_BST
 191         };
 192         struct acpi_buffer data = { 0, NULL };
 193         union acpi_object *package = NULL;
 194
 195
 196         if (!battery || !bst)
 197                 return -EINVAL;
 198
 199         /* Evalute _BST */
 200
 201         status = acpi_evaluate_object(battery->device->handle, "_BST", NULL, &buffer);
 202         if (ACPI_FAILURE(status)) {
 203                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
 204                 return -ENODEV;
 205         }
 206
 207         package = (union acpi_object *)buffer.pointer;
 208
 209         /* Extract Package Data */
 210
 211         status = acpi_extract_package(package, &format, &data);
 212         if (status != AE_BUFFER_OVERFLOW) {
 213                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _BST"));
 214                 result = -ENODEV;
 215                 goto end;
 216         }
 217
 218         data.pointer = kmalloc(data.length, GFP_KERNEL);
 219         if (!data.pointer) {
 220                 result = -ENOMEM;
 221                 goto end;
 222         }
 223         memset(data.pointer, 0, data.length);
 224
 225         status = acpi_extract_package(package, &format, &data);
 226         if (ACPI_FAILURE(status)) {
 227                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _BST"));
 228                 kfree(data.pointer);
 229                 result = -ENODEV;
 230                 goto end;
 231         }
 232
 233       end:
 234         kfree(buffer.pointer);
 235
 236         if (!result)
 237                 (*bst) = (struct acpi_battery_status *)data.pointer;
 238
 239         return result;
 240 }
 241
 242 static int
 243 acpi_battery_set_alarm(struct acpi_battery *battery, unsigned long alarm)
 244 {
 245         acpi_status status = 0;
 246         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 247         struct acpi_object_list arg_list = { 1, &arg0 };
 248
 249
 250         if (!battery)
 251                 return -EINVAL;
 252
 253         if (!battery->flags.alarm)
 254                 return -ENODEV;
 255
 256         arg0.integer.value = alarm;
 257
 258         status = acpi_evaluate_object(battery->device->handle, "_BTP", &arg_list, NULL);
 259         if (ACPI_FAILURE(status))
 260                 return -ENODEV;
 261
 262         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", (u32) alarm));
 263
 264         battery->alarm = alarm;
 265
 266         return 0;
 267 }
 268
 269 static int acpi_battery_check(struct acpi_battery *battery)
 270 {
 271         int result = 0;
 272         acpi_status status = AE_OK;
 273         acpi_handle handle = NULL;
 274         struct acpi_device *device = NULL;
 275         struct acpi_battery_info *bif = NULL;
 276
 277
 278         if (!battery)
 279                 return -EINVAL;
 280
 281         device = battery->device;
 282
 283         result = acpi_bus_get_status(device);
 284         if (result)
 285                 return result;
 286
 287         /* Insertion? */
 288
 289         if (!battery->flags.present && device->status.battery_present) {
 290
 291                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Battery inserted\n"));
 292
 293                 /* Evalute _BIF to get certain static information */
 294
 295                 result = acpi_battery_get_info(battery, &bif);
 296                 if (result)
 297                         return result;
 298
 299                 battery->flags.power_unit = bif->power_unit;
 300                 battery->trips.warning = bif->design_capacity_warning;
 301                 battery->trips.low = bif->design_capacity_low;
 302                 kfree(bif);
 303
 304                 /* See if alarms are supported, and if so, set default */
 305
 306                 status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
 307                 if (ACPI_SUCCESS(status)) {
 308                         battery->flags.alarm = 1;
 309                         acpi_battery_set_alarm(battery, battery->trips.warning);
 310                 }
 311         }
 312
 313         /* Removal? */
 314
 315         else if (battery->flags.present && !device->status.battery_present) {
 316                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Battery removed\n"));
 317         }
 318
 319         battery->flags.present = device->status.battery_present;
 320
 321         return result;
 322 }
 323
 324 /* --------------------------------------------------------------------------
 325                               FS Interface (/proc)
 326    -------------------------------------------------------------------------- */
 327
 328 static struct proc_dir_entry *acpi_battery_dir;
 329 static int acpi_battery_read_info(struct seq_file *seq, void *offset)
 330 {
 331         int result = 0;
 332         struct acpi_battery *battery = (struct acpi_battery *)seq->private;
 333         struct acpi_battery_info *bif = NULL;
 334         char *units = "?";
 335
 336
 337         if (!battery)
 338                 goto end;
 339
 340         if (battery->flags.present)
 341                 seq_printf(seq, "present:                 yes\n");
 342         else {
 343                 seq_printf(seq, "present:                 no\n");
 344                 goto end;
 345         }
 346
 347         /* Battery Info (_BIF) */
 348
 349         result = acpi_battery_get_info(battery, &bif);
 350         if (result || !bif) {
 351                 seq_printf(seq, "ERROR: Unable to read battery information\n");
 352                 goto end;
 353         }
 354
 355         units =
 356             bif->
 357             power_unit ? ACPI_BATTERY_UNITS_AMPS : ACPI_BATTERY_UNITS_WATTS;
 358
 359         if (bif->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 360                 seq_printf(seq, "design capacity:         unknown\n");
 361         else
 362                 seq_printf(seq, "design capacity:         %d %sh\n",
 363                            (u32) bif->design_capacity, units);
 364
 365         if (bif->last_full_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 366                 seq_printf(seq, "last full capacity:      unknown\n");
 367         else
 368                 seq_printf(seq, "last full capacity:      %d %sh\n",
 369                            (u32) bif->last_full_capacity, units);
 370
 371         switch ((u32) bif->battery_technology) {
 372         case 0:
 373                 seq_printf(seq, "battery technology:      non-rechargeable\n");
 374                 break;
 375         case 1:
 376                 seq_printf(seq, "battery technology:      rechargeable\n");
 377                 break;
 378         default:
 379                 seq_printf(seq, "battery technology:      unknown\n");
 380                 break;
 381         }
 382
 383         if (bif->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 384                 seq_printf(seq, "design voltage:          unknown\n");
 385         else
 386                 seq_printf(seq, "design voltage:          %d mV\n",
 387                            (u32) bif->design_voltage);
 388
 389         seq_printf(seq, "design capacity warning: %d %sh\n",
 390                    (u32) bif->design_capacity_warning, units);
 391         seq_printf(seq, "design capacity low:     %d %sh\n",
 392                    (u32) bif->design_capacity_low, units);
 393         seq_printf(seq, "capacity granularity 1:  %d %sh\n",
 394                    (u32) bif->battery_capacity_granularity_1, units);
 395         seq_printf(seq, "capacity granularity 2:  %d %sh\n",
 396                    (u32) bif->battery_capacity_granularity_2, units);
 397         seq_printf(seq, "model number:            %s\n", bif->model_number);
 398         seq_printf(seq, "serial number:           %s\n", bif->serial_number);
 399         seq_printf(seq, "battery type:            %s\n", bif->battery_type);
 400         seq_printf(seq, "OEM info:                %s\n", bif->oem_info);
 401
 402       end:
 403         kfree(bif);
 404
 405         return 0;
 406 }
 407
 408 static int acpi_battery_info_open_fs(struct inode *inode, struct file *file)
 409 {
 410         return single_open(file, acpi_battery_read_info, PDE(inode)->data);
 411 }
 412
 413 static int acpi_battery_read_state(struct seq_file *seq, void *offset)
 414 {
 415         int result = 0;
 416         struct acpi_battery *battery = (struct acpi_battery *)seq->private;
 417         struct acpi_battery_status *bst = NULL;
 418         char *units = "?";
 419
 420
 421         if (!battery)
 422                 goto end;
 423
 424         if (battery->flags.present)
 425                 seq_printf(seq, "present:                 yes\n");
 426         else {
 427                 seq_printf(seq, "present:                 no\n");
 428                 goto end;
 429         }
 430
 431         /* Battery Units */
 432
 433         units =
 434             battery->flags.
 435             power_unit ? ACPI_BATTERY_UNITS_AMPS : ACPI_BATTERY_UNITS_WATTS;
 436
 437         /* Battery Status (_BST) */
 438
 439         result = acpi_battery_get_status(battery, &bst);
 440         if (result || !bst) {
 441                 seq_printf(seq, "ERROR: Unable to read battery status\n");
 442                 goto end;
 443         }
 444
 445         if (!(bst->state & 0x04))
 446                 seq_printf(seq, "capacity state:          ok\n");
 447         else
 448                 seq_printf(seq, "capacity state:          critical\n");
 449
 450         if ((bst->state & 0x01) && (bst->state & 0x02)) {
 451                 seq_printf(seq,
 452                            "charging state:          charging/discharging\n");
 453         } else if (bst->state & 0x01)
 454                 seq_printf(seq, "charging state:          discharging\n");
 455         else if (bst->state & 0x02)
 456                 seq_printf(seq, "charging state:          charging\n");
 457         else {
 458                 seq_printf(seq, "charging state:          charged\n");
 459         }
 460
 461         if (bst->present_rate == ACPI_BATTERY_VALUE_UNKNOWN)
 462                 seq_printf(seq, "present rate:            unknown\n");
 463         else
 464                 seq_printf(seq, "present rate:            %d %s\n",
 465                            (u32) bst->present_rate, units);
 466
 467         if (bst->remaining_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 468                 seq_printf(seq, "remaining capacity:      unknown\n");
 469         else
 470                 seq_printf(seq, "remaining capacity:      %d %sh\n",
 471                            (u32) bst->remaining_capacity, units);
 472
 473         if (bst->present_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 474                 seq_printf(seq, "present voltage:         unknown\n");
 475         else
 476                 seq_printf(seq, "present voltage:         %d mV\n",
 477                            (u32) bst->present_voltage);
 478
 479       end:
 480         kfree(bst);
 481
 482         return 0;
 483 }
 484
 485 static int acpi_battery_state_open_fs(struct inode *inode, struct file *file)
 486 {
 487         return single_open(file, acpi_battery_read_state, PDE(inode)->data);
 488 }
 489
 490 static int acpi_battery_read_alarm(struct seq_file *seq, void *offset)
 491 {
 492         struct acpi_battery *battery = (struct acpi_battery *)seq->private;
 493         char *units = "?";
 494
 495
 496         if (!battery)
 497                 goto end;
 498
 499         if (!battery->flags.present) {
 500                 seq_printf(seq, "present:                 no\n");
 501                 goto end;
 502         }
 503
 504         /* Battery Units */
 505
 506         units =
 507             battery->flags.
 508             power_unit ? ACPI_BATTERY_UNITS_AMPS : ACPI_BATTERY_UNITS_WATTS;
 509
 510         /* Battery Alarm */
 511
 512         seq_printf(seq, "alarm:                   ");
 513         if (!battery->alarm)
 514                 seq_printf(seq, "unsupported\n");
 515         else
 516                 seq_printf(seq, "%d %sh\n", (u32) battery->alarm, units);
 517
 518       end:
 519         return 0;
 520 }
 521
 522 static ssize_t
 523 acpi_battery_write_alarm(struct file *file,
 524                          const char __user * buffer,
 525                          size_t count, loff_t * ppos)
 526 {
 527         int result = 0;
 528         char alarm_string[12] = { '\0' };
 529         struct seq_file *m = (struct seq_file *)file->private_data;
 530         struct acpi_battery *battery = (struct acpi_battery *)m->private;
 531
 532
 533         if (!battery || (count > sizeof(alarm_string) - 1))
 534                 return -EINVAL;
 535
 536         if (!battery->flags.present)
 537                 return -ENODEV;
 538
 539         if (copy_from_user(alarm_string, buffer, count))
 540                 return -EFAULT;
 541
 542         alarm_string[count] = '\0';
 543
 544         result = acpi_battery_set_alarm(battery,
 545                                         simple_strtoul(alarm_string, NULL, 0));
 546         if (result)
 547                 return result;
 548
 549         return count;
 550 }
 551
 552 static int acpi_battery_alarm_open_fs(struct inode *inode, struct file *file)
 553 {
 554         return single_open(file, acpi_battery_read_alarm, PDE(inode)->data);
 555 }
 556
 557 static struct file_operations acpi_battery_info_ops = {
 558         .open = acpi_battery_info_open_fs,
 559         .read = seq_read,
 560         .llseek = seq_lseek,
 561         .release = single_release,
 562         .owner = THIS_MODULE,
 563 };
 564
 565 static struct file_operations acpi_battery_state_ops = {
 566         .open = acpi_battery_state_open_fs,
 567         .read = seq_read,
 568         .llseek = seq_lseek,
 569         .release = single_release,
 570         .owner = THIS_MODULE,
 571 };
 572
 573 static struct file_operations acpi_battery_alarm_ops = {
 574         .open = acpi_battery_alarm_open_fs,
 575         .read = seq_read,
 576         .write = acpi_battery_write_alarm,
 577         .llseek = seq_lseek,
 578         .release = single_release,
 579         .owner = THIS_MODULE,
 580 };
 581
 582 static int acpi_battery_add_fs(struct acpi_device *device)
 583 {
 584         struct proc_dir_entry *entry = NULL;
 585
 586
 587         if (!acpi_device_dir(device)) {
 588                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 589                                                      acpi_battery_dir);
 590                 if (!acpi_device_dir(device))
 591                         return -ENODEV;
 592                 acpi_device_dir(device)->owner = THIS_MODULE;
 593         }
 594
 595         /* 'info' [R] */
 596         entry = create_proc_entry(ACPI_BATTERY_FILE_INFO,
 597                                   S_IRUGO, acpi_device_dir(device));
 598         if (!entry)
 599                 return -ENODEV;
 600         else {
 601                 entry->proc_fops = &acpi_battery_info_ops;
 602                 entry->data = acpi_driver_data(device);
 603                 entry->owner = THIS_MODULE;
 604         }
 605
 606         /* 'status' [R] */
 607         entry = create_proc_entry(ACPI_BATTERY_FILE_STATUS,
 608                                   S_IRUGO, acpi_device_dir(device));
 609         if (!entry)
 610                 return -ENODEV;
 611         else {
 612                 entry->proc_fops = &acpi_battery_state_ops;
 613                 entry->data = acpi_driver_data(device);
 614                 entry->owner = THIS_MODULE;
 615         }
 616
 617         /* 'alarm' [R/W] */
 618         entry = create_proc_entry(ACPI_BATTERY_FILE_ALARM,
 619                                   S_IFREG | S_IRUGO | S_IWUSR,
 620                                   acpi_device_dir(device));
 621         if (!entry)
 622                 return -ENODEV;
 623         else {
 624                 entry->proc_fops = &acpi_battery_alarm_ops;
 625                 entry->data = acpi_driver_data(device);
 626                 entry->owner = THIS_MODULE;
 627         }
 628
 629         return 0;
 630 }
 631
 632 static int acpi_battery_remove_fs(struct acpi_device *device)
 633 {
 634
 635         if (acpi_device_dir(device)) {
 636                 remove_proc_entry(ACPI_BATTERY_FILE_ALARM,
 637                                   acpi_device_dir(device));
 638                 remove_proc_entry(ACPI_BATTERY_FILE_STATUS,
 639                                   acpi_device_dir(device));
 640                 remove_proc_entry(ACPI_BATTERY_FILE_INFO,
 641                                   acpi_device_dir(device));
 642
 643                 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
 644                 acpi_device_dir(device) = NULL;
 645         }
 646
 647         return 0;
 648 }
 649
 650 /* --------------------------------------------------------------------------
 651                                  Driver Interface
 652    -------------------------------------------------------------------------- */
 653
 654 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
 655 {
 656         struct acpi_battery *battery = (struct acpi_battery *)data;
 657         struct acpi_device *device = NULL;
 658
 659
 660         if (!battery)
 661                 return;
 662
 663         device = battery->device;
 664
 665         switch (event) {
 666         case ACPI_BATTERY_NOTIFY_STATUS:
 667         case ACPI_BATTERY_NOTIFY_INFO:
 668                 acpi_battery_check(battery);
 669                 acpi_bus_generate_event(device, event, battery->flags.present);
 670                 break;
 671         default:
 672                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 673                                   "Unsupported event [0x%x]\n", event));
 674                 break;
 675         }
 676
 677         return;
 678 }
 679
 680 static int acpi_battery_add(struct acpi_device *device)
 681 {
 682         int result = 0;
 683         acpi_status status = 0;
 684         struct acpi_battery *battery = NULL;
 685
 686
 687         if (!device)
 688                 return -EINVAL;
 689
 690         battery = kmalloc(sizeof(struct acpi_battery), GFP_KERNEL);
 691         if (!battery)
 692                 return -ENOMEM;
 693         memset(battery, 0, sizeof(struct acpi_battery));
 694
 695         battery->device = device;
 696         strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
 697         strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
 698         acpi_driver_data(device) = battery;
 699
 700         result = acpi_battery_check(battery);
 701         if (result)
 702                 goto end;
 703
 704         result = acpi_battery_add_fs(device);
 705         if (result)
 706                 goto end;
 707
 708         status = acpi_install_notify_handler(device->handle,
 709                                              ACPI_DEVICE_NOTIFY,
 710                                              acpi_battery_notify, battery);
 711         if (ACPI_FAILURE(status)) {
 712                 result = -ENODEV;
 713                 goto end;
 714         }
 715
 716         printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
 717                ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
 718                device->status.battery_present ? "present" : "absent");
 719
 720       end:
 721         if (result) {
 722                 acpi_battery_remove_fs(device);
 723                 kfree(battery);
 724         }
 725
 726         return result;
 727 }
 728
 729 static int acpi_battery_remove(struct acpi_device *device, int type)
 730 {
 731         acpi_status status = 0;
 732         struct acpi_battery *battery = NULL;
 733
 734
 735         if (!device || !acpi_driver_data(device))
 736                 return -EINVAL;
 737
 738         battery = (struct acpi_battery *)acpi_driver_data(device);
 739
 740         status = acpi_remove_notify_handler(device->handle,
 741                                             ACPI_DEVICE_NOTIFY,
 742                                             acpi_battery_notify);
 743
 744         acpi_battery_remove_fs(device);
 745
 746         kfree(battery);
 747
 748         return 0;
 749 }
 750
 751 static int __init acpi_battery_init(void)
 752 {
 753         int result = 0;
 754
 755
 756         acpi_battery_dir = proc_mkdir(ACPI_BATTERY_CLASS, acpi_root_dir);
 757         if (!acpi_battery_dir)
 758                 return -ENODEV;
 759         acpi_battery_dir->owner = THIS_MODULE;
 760
 761         result = acpi_bus_register_driver(&acpi_battery_driver);
 762         if (result < 0) {
 763                 remove_proc_entry(ACPI_BATTERY_CLASS, acpi_root_dir);
 764                 return -ENODEV;
 765         }
 766
 767         return 0;
 768 }
 769
 770 static void __exit acpi_battery_exit(void)
 771 {
 772
 773         acpi_bus_unregister_driver(&acpi_battery_driver);
 774
 775         remove_proc_entry(ACPI_BATTERY_CLASS, acpi_root_dir);
 776
 777         return;
 778 }
 779
 780 module_init(acpi_battery_init);
 781 module_exit(acpi_battery_exit);