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_DEVICE_NAME        "Battery"
  46 #define ACPI_BATTERY_FILE_INFO          "info"
  47 #define ACPI_BATTERY_FILE_STATUS        "state"
  48 #define ACPI_BATTERY_FILE_ALARM         "alarm"
  49 #define ACPI_BATTERY_NOTIFY_STATUS      0x80
  50 #define ACPI_BATTERY_NOTIFY_INFO        0x81
  51 #define ACPI_BATTERY_UNITS_WATTS        "mW"
  52 #define ACPI_BATTERY_UNITS_AMPS         "mA"
  53
  54 #define _COMPONENT              ACPI_BATTERY_COMPONENT
  55 ACPI_MODULE_NAME("battery");
  56
  57 MODULE_AUTHOR("Paul Diefenbaugh");
  58 MODULE_DESCRIPTION("ACPI Battery Driver");
  59 MODULE_LICENSE("GPL");
  60
  61 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
  62 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
  63
  64 static int acpi_battery_add(struct acpi_device *device);
  65 static int acpi_battery_remove(struct acpi_device *device, int type);
  66 static int acpi_battery_resume(struct acpi_device *device);
  67
  68 static struct acpi_driver acpi_battery_driver = {
  69         .name = "battery",
  70         .class = ACPI_BATTERY_CLASS,
  71         .ids = ACPI_BATTERY_HID,
  72         .ops = {
  73                 .add = acpi_battery_add,
  74                 .resume = acpi_battery_resume,
  75                 .remove = acpi_battery_remove,
  76                 },
  77 };
  78
  79 struct acpi_battery_status {
  80         acpi_integer state;
  81         acpi_integer present_rate;
  82         acpi_integer remaining_capacity;
  83         acpi_integer present_voltage;
  84 };
  85
  86 struct acpi_battery_info {
  87         acpi_integer power_unit;
  88         acpi_integer design_capacity;
  89         acpi_integer last_full_capacity;
  90         acpi_integer battery_technology;
  91         acpi_integer design_voltage;
  92         acpi_integer design_capacity_warning;
  93         acpi_integer design_capacity_low;
  94         acpi_integer battery_capacity_granularity_1;
  95         acpi_integer battery_capacity_granularity_2;
  96         acpi_string model_number;
  97         acpi_string serial_number;
  98         acpi_string battery_type;
  99         acpi_string oem_info;
 100 };
 101
 102 struct acpi_battery_flags {
 103         u8 present:1;           /* Bay occupied? */
 104         u8 power_unit:1;        /* 0=watts, 1=apms */
 105         u8 alarm:1;             /* _BTP present? */
 106         u8 reserved:5;
 107 };
 108
 109 struct acpi_battery_trips {
 110         unsigned long warning;
 111         unsigned long low;
 112 };
 113
 114 struct acpi_battery {
 115         struct acpi_device * device;
 116         struct acpi_battery_flags flags;
 117         struct acpi_battery_trips trips;
 118         unsigned long alarm;
 119         struct acpi_battery_info *info;
 120 };
 121
 122 /* --------------------------------------------------------------------------
 123                                Battery Management
 124    -------------------------------------------------------------------------- */
 125
 126 static int
 127 acpi_battery_get_info(struct acpi_battery *battery,
 128                       struct acpi_battery_info **bif)
 129 {
 130         int result = 0;
 131         acpi_status status = 0;
 132         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 133         struct acpi_buffer format = { sizeof(ACPI_BATTERY_FORMAT_BIF),
 134                 ACPI_BATTERY_FORMAT_BIF
 135         };
 136         struct acpi_buffer data = { 0, NULL };
 137         union acpi_object *package = NULL;
 138
 139
 140         if (!battery || !bif)
 141                 return -EINVAL;
 142
 143         /* Evalute _BIF */
 144
 145         status = acpi_evaluate_object(battery->device->handle, "_BIF", NULL, &buffer);
 146         if (ACPI_FAILURE(status)) {
 147                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
 148                 return -ENODEV;
 149         }
 150
 151         package = buffer.pointer;
 152
 153         /* Extract Package Data */
 154
 155         status = acpi_extract_package(package, &format, &data);
 156         if (status != AE_BUFFER_OVERFLOW) {
 157                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _BIF"));
 158                 result = -ENODEV;
 159                 goto end;
 160         }
 161
 162         data.pointer = kzalloc(data.length, GFP_KERNEL);
 163         if (!data.pointer) {
 164                 result = -ENOMEM;
 165                 goto end;
 166         }
 167
 168         status = acpi_extract_package(package, &format, &data);
 169         if (ACPI_FAILURE(status)) {
 170                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _BIF"));
 171                 kfree(data.pointer);
 172                 result = -ENODEV;
 173                 goto end;
 174         }
 175
 176       end:
 177         kfree(buffer.pointer);
 178
 179         if (!result)
 180                 (*bif) = data.pointer;
 181
 182         return result;
 183 }
 184
 185 static int
 186 acpi_battery_get_status(struct acpi_battery *battery,
 187                         struct acpi_battery_status **bst)
 188 {
 189         int result = 0;
 190         acpi_status status = 0;
 191         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 192         struct acpi_buffer format = { sizeof(ACPI_BATTERY_FORMAT_BST),
 193                 ACPI_BATTERY_FORMAT_BST
 194         };
 195         struct acpi_buffer data = { 0, NULL };
 196         union acpi_object *package = NULL;
 197
 198
 199         if (!battery || !bst)
 200                 return -EINVAL;
 201
 202         /* Evalute _BST */
 203
 204         status = acpi_evaluate_object(battery->device->handle, "_BST", NULL, &buffer);
 205         if (ACPI_FAILURE(status)) {
 206                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
 207                 return -ENODEV;
 208         }
 209
 210         package = buffer.pointer;
 211
 212         /* Extract Package Data */
 213
 214         status = acpi_extract_package(package, &format, &data);
 215         if (status != AE_BUFFER_OVERFLOW) {
 216                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _BST"));
 217                 result = -ENODEV;
 218                 goto end;
 219         }
 220
 221         data.pointer = kzalloc(data.length, GFP_KERNEL);
 222         if (!data.pointer) {
 223                 result = -ENOMEM;
 224                 goto end;
 225         }
 226
 227         status = acpi_extract_package(package, &format, &data);
 228         if (ACPI_FAILURE(status)) {
 229                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _BST"));
 230                 kfree(data.pointer);
 231                 result = -ENODEV;
 232                 goto end;
 233         }
 234
 235       end:
 236         kfree(buffer.pointer);
 237
 238         if (!result)
 239                 (*bst) = data.pointer;
 240
 241         return result;
 242 }
 243
 244 static int
 245 acpi_battery_set_alarm(struct acpi_battery *battery, unsigned long alarm)
 246 {
 247         acpi_status status = 0;
 248         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 249         struct acpi_object_list arg_list = { 1, &arg0 };
 250
 251
 252         if (!battery)
 253                 return -EINVAL;
 254
 255         if (!battery->flags.alarm)
 256                 return -ENODEV;
 257
 258         arg0.integer.value = alarm;
 259
 260         status = acpi_evaluate_object(battery->device->handle, "_BTP", &arg_list, NULL);
 261         if (ACPI_FAILURE(status))
 262                 return -ENODEV;
 263
 264         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", (u32) alarm));
 265
 266         battery->alarm = alarm;
 267
 268         return 0;
 269 }
 270
 271 static int acpi_battery_check(struct acpi_battery *battery)
 272 {
 273         int result = 0;
 274         acpi_status status = AE_OK;
 275         acpi_handle handle = NULL;
 276         struct acpi_device *device = NULL;
 277         struct acpi_battery_info *bif = NULL;
 278
 279
 280         if (!battery)
 281                 return -EINVAL;
 282
 283         device = battery->device;
 284
 285         result = acpi_bus_get_status(device);
 286         if (result)
 287                 return result;
 288
 289         /* Insertion? */
 290
 291         if (!battery->flags.present && device->status.battery_present) {
 292
 293                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Battery inserted\n"));
 294
 295                 /* Evalute _BIF to get certain static information */
 296
 297                 result = acpi_battery_get_info(battery, &bif);
 298                 if (result)
 299                         return result;
 300
 301                 battery->flags.power_unit = bif->power_unit;
 302                 battery->trips.warning = bif->design_capacity_warning;
 303                 battery->trips.low = bif->design_capacity_low;
 304                 kfree(bif);
 305
 306                 /* See if alarms are supported, and if so, set default */
 307
 308                 status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
 309                 if (ACPI_SUCCESS(status)) {
 310                         battery->flags.alarm = 1;
 311                         acpi_battery_set_alarm(battery, battery->trips.warning);
 312                 }
 313         }
 314
 315         /* Removal? */
 316
 317         else if (battery->flags.present && !device->status.battery_present) {
 318                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Battery removed\n"));
 319         }
 320
 321         battery->flags.present = device->status.battery_present;
 322
 323         return result;
 324 }
 325
 326 /* --------------------------------------------------------------------------
 327                               FS Interface (/proc)
 328    -------------------------------------------------------------------------- */
 329
 330 static struct proc_dir_entry *acpi_battery_dir;
 331 static int acpi_battery_read_info(struct seq_file *seq, void *offset)
 332 {
 333         int result = 0;
 334         struct acpi_battery *battery = seq->private;
 335         struct acpi_battery_info *bif = NULL;
 336         char *units = "?";
 337
 338
 339         if (!battery)
 340                 goto end;
 341
 342         if (battery->flags.present)
 343                 seq_printf(seq, "present:                 yes\n");
 344         else {
 345                 seq_printf(seq, "present:                 no\n");
 346                 goto end;
 347         }
 348
 349         /* Battery Info (_BIF) */
 350
 351         result = acpi_battery_get_info(battery, &bif);
 352         if (result || !bif) {
 353                 seq_printf(seq, "ERROR: Unable to read battery information\n");
 354                 goto end;
 355         }
 356
 357         units =
 358             bif->
 359             power_unit ? ACPI_BATTERY_UNITS_AMPS : ACPI_BATTERY_UNITS_WATTS;
 360
 361         if (bif->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 362                 seq_printf(seq, "design capacity:         unknown\n");
 363         else
 364                 seq_printf(seq, "design capacity:         %d %sh\n",
 365                            (u32) bif->design_capacity, units);
 366
 367         if (bif->last_full_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 368                 seq_printf(seq, "last full capacity:      unknown\n");
 369         else
 370                 seq_printf(seq, "last full capacity:      %d %sh\n",
 371                            (u32) bif->last_full_capacity, units);
 372
 373         switch ((u32) bif->battery_technology) {
 374         case 0:
 375                 seq_printf(seq, "battery technology:      non-rechargeable\n");
 376                 break;
 377         case 1:
 378                 seq_printf(seq, "battery technology:      rechargeable\n");
 379                 break;
 380         default:
 381                 seq_printf(seq, "battery technology:      unknown\n");
 382                 break;
 383         }
 384
 385         if (bif->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 386                 seq_printf(seq, "design voltage:          unknown\n");
 387         else
 388                 seq_printf(seq, "design voltage:          %d mV\n",
 389                            (u32) bif->design_voltage);
 390
 391         seq_printf(seq, "design capacity warning: %d %sh\n",
 392                    (u32) bif->design_capacity_warning, units);
 393         seq_printf(seq, "design capacity low:     %d %sh\n",
 394                    (u32) bif->design_capacity_low, units);
 395         seq_printf(seq, "capacity granularity 1:  %d %sh\n",
 396                    (u32) bif->battery_capacity_granularity_1, units);
 397         seq_printf(seq, "capacity granularity 2:  %d %sh\n",
 398                    (u32) bif->battery_capacity_granularity_2, units);
 399         seq_printf(seq, "model number:            %s\n", bif->model_number);
 400         seq_printf(seq, "serial number:           %s\n", bif->serial_number);
 401         seq_printf(seq, "battery type:            %s\n", bif->battery_type);
 402         seq_printf(seq, "OEM info:                %s\n", bif->oem_info);
 403
 404       end:
 405         kfree(bif);
 406
 407         return 0;
 408 }
 409
 410 static int acpi_battery_info_open_fs(struct inode *inode, struct file *file)
 411 {
 412         return single_open(file, acpi_battery_read_info, PDE(inode)->data);
 413 }
 414
 415 static int acpi_battery_read_state(struct seq_file *seq, void *offset)
 416 {
 417         int result = 0;
 418         struct acpi_battery *battery = seq->private;
 419         struct acpi_battery_status *bst = NULL;
 420         char *units = "?";
 421
 422
 423         if (!battery)
 424                 goto end;
 425
 426         if (battery->flags.present)
 427                 seq_printf(seq, "present:                 yes\n");
 428         else {
 429                 seq_printf(seq, "present:                 no\n");
 430                 goto end;
 431         }
 432
 433         /* Battery Units */
 434
 435         units =
 436             battery->flags.
 437             power_unit ? ACPI_BATTERY_UNITS_AMPS : ACPI_BATTERY_UNITS_WATTS;
 438
 439         /* Battery Status (_BST) */
 440
 441         result = acpi_battery_get_status(battery, &bst);
 442         if (result || !bst) {
 443                 seq_printf(seq, "ERROR: Unable to read battery status\n");
 444                 goto end;
 445         }
 446
 447         if (!(bst->state & 0x04))
 448                 seq_printf(seq, "capacity state:          ok\n");
 449         else
 450                 seq_printf(seq, "capacity state:          critical\n");
 451
 452         if ((bst->state & 0x01) && (bst->state & 0x02)) {
 453                 seq_printf(seq,
 454                            "charging state:          charging/discharging\n");
 455         } else if (bst->state & 0x01)
 456                 seq_printf(seq, "charging state:          discharging\n");
 457         else if (bst->state & 0x02)
 458                 seq_printf(seq, "charging state:          charging\n");
 459         else {
 460                 seq_printf(seq, "charging state:          charged\n");
 461         }
 462
 463         if (bst->present_rate == ACPI_BATTERY_VALUE_UNKNOWN)
 464                 seq_printf(seq, "present rate:            unknown\n");
 465         else
 466                 seq_printf(seq, "present rate:            %d %s\n",
 467                            (u32) bst->present_rate, units);
 468
 469         if (bst->remaining_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 470                 seq_printf(seq, "remaining capacity:      unknown\n");
 471         else
 472                 seq_printf(seq, "remaining capacity:      %d %sh\n",
 473                            (u32) bst->remaining_capacity, units);
 474
 475         if (bst->present_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 476                 seq_printf(seq, "present voltage:         unknown\n");
 477         else
 478                 seq_printf(seq, "present voltage:         %d mV\n",
 479                            (u32) bst->present_voltage);
 480
 481       end:
 482         kfree(bst);
 483
 484         return 0;
 485 }
 486
 487 static int acpi_battery_state_open_fs(struct inode *inode, struct file *file)
 488 {
 489         return single_open(file, acpi_battery_read_state, PDE(inode)->data);
 490 }
 491
 492 static int acpi_battery_read_alarm(struct seq_file *seq, void *offset)
 493 {
 494         struct acpi_battery *battery = seq->private;
 495         char *units = "?";
 496
 497
 498         if (!battery)
 499                 goto end;
 500
 501         if (!battery->flags.present) {
 502                 seq_printf(seq, "present:                 no\n");
 503                 goto end;
 504         }
 505
 506         /* Battery Units */
 507
 508         units =
 509             battery->flags.
 510             power_unit ? ACPI_BATTERY_UNITS_AMPS : ACPI_BATTERY_UNITS_WATTS;
 511
 512         /* Battery Alarm */
 513
 514         seq_printf(seq, "alarm:                   ");
 515         if (!battery->alarm)
 516                 seq_printf(seq, "unsupported\n");
 517         else
 518                 seq_printf(seq, "%d %sh\n", (u32) battery->alarm, units);
 519
 520       end:
 521         return 0;
 522 }
 523
 524 static ssize_t
 525 acpi_battery_write_alarm(struct file *file,
 526                          const char __user * buffer,
 527                          size_t count, loff_t * ppos)
 528 {
 529         int result = 0;
 530         char alarm_string[12] = { '\0' };
 531         struct seq_file *m = file->private_data;
 532         struct acpi_battery *battery = m->private;
 533
 534
 535         if (!battery || (count > sizeof(alarm_string) - 1))
 536                 return -EINVAL;
 537
 538         if (!battery->flags.present)
 539                 return -ENODEV;
 540
 541         if (copy_from_user(alarm_string, buffer, count))
 542                 return -EFAULT;
 543
 544         alarm_string[count] = '\0';
 545
 546         result = acpi_battery_set_alarm(battery,
 547                                         simple_strtoul(alarm_string, NULL, 0));
 548         if (result)
 549                 return result;
 550
 551         return count;
 552 }
 553
 554 static int acpi_battery_alarm_open_fs(struct inode *inode, struct file *file)
 555 {
 556         return single_open(file, acpi_battery_read_alarm, PDE(inode)->data);
 557 }
 558
 559 static const struct file_operations acpi_battery_info_ops = {
 560         .open = acpi_battery_info_open_fs,
 561         .read = seq_read,
 562         .llseek = seq_lseek,
 563         .release = single_release,
 564         .owner = THIS_MODULE,
 565 };
 566
 567 static const struct file_operations acpi_battery_state_ops = {
 568         .open = acpi_battery_state_open_fs,
 569         .read = seq_read,
 570         .llseek = seq_lseek,
 571         .release = single_release,
 572         .owner = THIS_MODULE,
 573 };
 574
 575 static const struct file_operations acpi_battery_alarm_ops = {
 576         .open = acpi_battery_alarm_open_fs,
 577         .read = seq_read,
 578         .write = acpi_battery_write_alarm,
 579         .llseek = seq_lseek,
 580         .release = single_release,
 581         .owner = THIS_MODULE,
 582 };
 583
 584 static int acpi_battery_add_fs(struct acpi_device *device)
 585 {
 586         struct proc_dir_entry *entry = NULL;
 587
 588
 589         if (!acpi_device_dir(device)) {
 590                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 591                                                      acpi_battery_dir);
 592                 if (!acpi_device_dir(device))
 593                         return -ENODEV;
 594                 acpi_device_dir(device)->owner = THIS_MODULE;
 595         }
 596
 597         /* 'info' [R] */
 598         entry = create_proc_entry(ACPI_BATTERY_FILE_INFO,
 599                                   S_IRUGO, acpi_device_dir(device));
 600         if (!entry)
 601                 return -ENODEV;
 602         else {
 603                 entry->proc_fops = &acpi_battery_info_ops;
 604                 entry->data = acpi_driver_data(device);
 605                 entry->owner = THIS_MODULE;
 606         }
 607
 608         /* 'status' [R] */
 609         entry = create_proc_entry(ACPI_BATTERY_FILE_STATUS,
 610                                   S_IRUGO, acpi_device_dir(device));
 611         if (!entry)
 612                 return -ENODEV;
 613         else {
 614                 entry->proc_fops = &acpi_battery_state_ops;
 615                 entry->data = acpi_driver_data(device);
 616                 entry->owner = THIS_MODULE;
 617         }
 618
 619         /* 'alarm' [R/W] */
 620         entry = create_proc_entry(ACPI_BATTERY_FILE_ALARM,
 621                                   S_IFREG | S_IRUGO | S_IWUSR,
 622                                   acpi_device_dir(device));
 623         if (!entry)
 624                 return -ENODEV;
 625         else {
 626                 entry->proc_fops = &acpi_battery_alarm_ops;
 627                 entry->data = acpi_driver_data(device);
 628                 entry->owner = THIS_MODULE;
 629         }
 630
 631         return 0;
 632 }
 633
 634 static int acpi_battery_remove_fs(struct acpi_device *device)
 635 {
 636
 637         if (acpi_device_dir(device)) {
 638                 remove_proc_entry(ACPI_BATTERY_FILE_ALARM,
 639                                   acpi_device_dir(device));
 640                 remove_proc_entry(ACPI_BATTERY_FILE_STATUS,
 641                                   acpi_device_dir(device));
 642                 remove_proc_entry(ACPI_BATTERY_FILE_INFO,
 643                                   acpi_device_dir(device));
 644
 645                 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
 646                 acpi_device_dir(device) = NULL;
 647         }
 648
 649         return 0;
 650 }
 651
 652 /* --------------------------------------------------------------------------
 653                                  Driver Interface
 654    -------------------------------------------------------------------------- */
 655
 656 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
 657 {
 658         struct acpi_battery *battery = data;
 659         struct acpi_device *device = NULL;
 660
 661
 662         if (!battery)
 663                 return;
 664
 665         device = battery->device;
 666
 667         switch (event) {
 668         case ACPI_BATTERY_NOTIFY_STATUS:
 669         case ACPI_BATTERY_NOTIFY_INFO:
 670         case ACPI_NOTIFY_BUS_CHECK:
 671         case ACPI_NOTIFY_DEVICE_CHECK:
 672                 acpi_battery_check(battery);
 673                 acpi_bus_generate_event(device, event, battery->flags.present);
 674                 break;
 675         default:
 676                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 677                                   "Unsupported event [0x%x]\n", event));
 678                 break;
 679         }
 680
 681         return;
 682 }
 683
 684 static int acpi_battery_add(struct acpi_device *device)
 685 {
 686         int result = 0;
 687         acpi_status status = 0;
 688         struct acpi_battery *battery = NULL;
 689
 690
 691         if (!device)
 692                 return -EINVAL;
 693
 694         battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
 695         if (!battery)
 696                 return -ENOMEM;
 697
 698         battery->device = device;
 699         strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
 700         strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
 701         acpi_driver_data(device) = battery;
 702
 703         result = acpi_battery_check(battery);
 704         if (result)
 705                 goto end;
 706
 707         result = acpi_battery_add_fs(device);
 708         if (result)
 709                 goto end;
 710
 711         status = acpi_install_notify_handler(device->handle,
 712                                              ACPI_ALL_NOTIFY,
 713                                              acpi_battery_notify, battery);
 714         if (ACPI_FAILURE(status)) {
 715                 result = -ENODEV;
 716                 goto end;
 717         }
 718
 719         printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
 720                ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
 721                device->status.battery_present ? "present" : "absent");
 722
 723       end:
 724         if (result) {
 725                 acpi_battery_remove_fs(device);
 726                 kfree(battery);
 727         }
 728
 729         return result;
 730 }
 731
 732 static int acpi_battery_remove(struct acpi_device *device, int type)
 733 {
 734         acpi_status status = 0;
 735         struct acpi_battery *battery = NULL;
 736
 737
 738         if (!device || !acpi_driver_data(device))
 739                 return -EINVAL;
 740
 741         battery = acpi_driver_data(device);
 742
 743         status = acpi_remove_notify_handler(device->handle,
 744                                             ACPI_ALL_NOTIFY,
 745                                             acpi_battery_notify);
 746
 747         acpi_battery_remove_fs(device);
 748
 749         kfree(battery);
 750
 751         return 0;
 752 }
 753
 754 /* this is needed to learn about changes made in suspended state */
 755 static int acpi_battery_resume(struct acpi_device *device)
 756 {
 757         struct acpi_battery *battery;
 758
 759         if (!device)
 760                 return -EINVAL;
 761
 762         battery = device->driver_data;
 763         return acpi_battery_check(battery);
 764 }
 765
 766 static int __init acpi_battery_init(void)
 767 {
 768         int result;
 769
 770         if (acpi_disabled)
 771                 return -ENODEV;
 772
 773         acpi_battery_dir = acpi_lock_battery_dir();
 774         if (!acpi_battery_dir)
 775                 return -ENODEV;
 776
 777         result = acpi_bus_register_driver(&acpi_battery_driver);
 778         if (result < 0) {
 779                 acpi_unlock_battery_dir(acpi_battery_dir);
 780                 return -ENODEV;
 781         }
 782
 783         return 0;
 784 }
 785
 786 static void __exit acpi_battery_exit(void)
 787 {
 788
 789         acpi_bus_unregister_driver(&acpi_battery_driver);
 790
 791         acpi_unlock_battery_dir(acpi_battery_dir);
 792
 793         return;
 794 }
 795
 796 module_init(acpi_battery_init);
 797 module_exit(acpi_battery_exit);