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