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   1 /*
   2  *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   5  *
   6  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or (at
  11  *  your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful, but
  14  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *  General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License along
  19  *  with this program; if not, write to the Free Software Foundation, Inc.,
  20  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  21  *
  22  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/ioport.h>
  28 #include <linux/list.h>
  29 #include <linux/sched.h>
  30 #include <linux/pm.h>
  31 #include <linux/pm_legacy.h>
  32 #include <linux/device.h>
  33 #include <linux/proc_fs.h>
  34 #ifdef CONFIG_X86
  35 #include <asm/mpspec.h>
  36 #endif
  37 #include <acpi/acpi_bus.h>
  38 #include <acpi/acpi_drivers.h>
  39
  40 #define _COMPONENT              ACPI_BUS_COMPONENT
  41 ACPI_MODULE_NAME("acpi_bus")
  42 #ifdef  CONFIG_X86
  43 extern void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger);
  44 #endif
  45
  46 struct fadt_descriptor acpi_fadt;
  47 EXPORT_SYMBOL(acpi_fadt);
  48
  49 struct acpi_device *acpi_root;
  50 struct proc_dir_entry *acpi_root_dir;
  51 EXPORT_SYMBOL(acpi_root_dir);
  52
  53 #define STRUCT_TO_INT(s)        (*((int*)&s))
  54
  55 /* --------------------------------------------------------------------------
  56                                 Device Management
  57    -------------------------------------------------------------------------- */
  58
  59 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
  60 {
  61         acpi_status status = AE_OK;
  62
  63
  64         if (!device)
  65                 return -EINVAL;
  66
  67         /* TBD: Support fixed-feature devices */
  68
  69         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
  70         if (ACPI_FAILURE(status) || !*device) {
  71                 ACPI_EXCEPTION((AE_INFO, status, "No context for object [%p]", handle));
  72                 return -ENODEV;
  73         }
  74
  75         return 0;
  76 }
  77
  78 EXPORT_SYMBOL(acpi_bus_get_device);
  79
  80 int acpi_bus_get_status(struct acpi_device *device)
  81 {
  82         acpi_status status = AE_OK;
  83         unsigned long sta = 0;
  84
  85
  86         if (!device)
  87                 return -EINVAL;
  88
  89         /*
  90          * Evaluate _STA if present.
  91          */
  92         if (device->flags.dynamic_status) {
  93                 status =
  94                     acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
  95                 if (ACPI_FAILURE(status))
  96                         return -ENODEV;
  97                 STRUCT_TO_INT(device->status) = (int)sta;
  98         }
  99
 100         /*
 101          * Otherwise we assume the status of our parent (unless we don't
 102          * have one, in which case status is implied).
 103          */
 104         else if (device->parent)
 105                 device->status = device->parent->status;
 106         else
 107                 STRUCT_TO_INT(device->status) = 0x0F;
 108
 109         if (device->status.functional && !device->status.present) {
 110                 printk(KERN_WARNING PREFIX "Device [%s] status [%08x]: "
 111                        "functional but not present; setting present\n",
 112                        device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status));
 113                 device->status.present = 1;
 114         }
 115
 116         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 117                           device->pnp.bus_id,
 118                           (u32) STRUCT_TO_INT(device->status)));
 119
 120         return 0;
 121 }
 122
 123 EXPORT_SYMBOL(acpi_bus_get_status);
 124
 125 /* --------------------------------------------------------------------------
 126                                  Power Management
 127    -------------------------------------------------------------------------- */
 128
 129 int acpi_bus_get_power(acpi_handle handle, int *state)
 130 {
 131         int result = 0;
 132         acpi_status status = 0;
 133         struct acpi_device *device = NULL;
 134         unsigned long psc = 0;
 135
 136
 137         result = acpi_bus_get_device(handle, &device);
 138         if (result)
 139                 return result;
 140
 141         *state = ACPI_STATE_UNKNOWN;
 142
 143         if (!device->flags.power_manageable) {
 144                 /* TBD: Non-recursive algorithm for walking up hierarchy */
 145                 if (device->parent)
 146                         *state = device->parent->power.state;
 147                 else
 148                         *state = ACPI_STATE_D0;
 149         } else {
 150                 /*
 151                  * Get the device's power state either directly (via _PSC) or
 152                  * indirectly (via power resources).
 153                  */
 154                 if (device->power.flags.explicit_get) {
 155                         status = acpi_evaluate_integer(device->handle, "_PSC",
 156                                                        NULL, &psc);
 157                         if (ACPI_FAILURE(status))
 158                                 return -ENODEV;
 159                         device->power.state = (int)psc;
 160                 } else if (device->power.flags.power_resources) {
 161                         result = acpi_power_get_inferred_state(device);
 162                         if (result)
 163                                 return result;
 164                 }
 165
 166                 *state = device->power.state;
 167         }
 168
 169         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
 170                           device->pnp.bus_id, device->power.state));
 171
 172         return 0;
 173 }
 174
 175 EXPORT_SYMBOL(acpi_bus_get_power);
 176
 177 int acpi_bus_set_power(acpi_handle handle, int state)
 178 {
 179         int result = 0;
 180         acpi_status status = AE_OK;
 181         struct acpi_device *device = NULL;
 182         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 183
 184
 185         result = acpi_bus_get_device(handle, &device);
 186         if (result)
 187                 return result;
 188
 189         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
 190                 return -EINVAL;
 191
 192         /* Make sure this is a valid target state */
 193
 194         if (!device->flags.power_manageable) {
 195                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable",
 196                                 device->kobj.name));
 197                 return -ENODEV;
 198         }
 199         /*
 200          * Get device's current power state if it's unknown
 201          * This means device power state isn't initialized or previous setting failed
 202          */
 203         if (!device->flags.force_power_state) {
 204                 if (device->power.state == ACPI_STATE_UNKNOWN)
 205                         acpi_bus_get_power(device->handle, &device->power.state);
 206                 if (state == device->power.state) {
 207                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
 208                                           state));
 209                         return 0;
 210                 }
 211         }
 212         if (!device->power.states[state].flags.valid) {
 213                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
 214                 return -ENODEV;
 215         }
 216         if (device->parent && (state < device->parent->power.state)) {
 217                 printk(KERN_WARNING PREFIX
 218                               "Cannot set device to a higher-powered"
 219                               " state than parent\n");
 220                 return -ENODEV;
 221         }
 222
 223         /*
 224          * Transition Power
 225          * ----------------
 226          * On transitions to a high-powered state we first apply power (via
 227          * power resources) then evalute _PSx.  Conversly for transitions to
 228          * a lower-powered state.
 229          */
 230         if (state < device->power.state) {
 231                 if (device->power.flags.power_resources) {
 232                         result = acpi_power_transition(device, state);
 233                         if (result)
 234                                 goto end;
 235                 }
 236                 if (device->power.states[state].flags.explicit_set) {
 237                         status = acpi_evaluate_object(device->handle,
 238                                                       object_name, NULL, NULL);
 239                         if (ACPI_FAILURE(status)) {
 240                                 result = -ENODEV;
 241                                 goto end;
 242                         }
 243                 }
 244         } else {
 245                 if (device->power.states[state].flags.explicit_set) {
 246                         status = acpi_evaluate_object(device->handle,
 247                                                       object_name, NULL, NULL);
 248                         if (ACPI_FAILURE(status)) {
 249                                 result = -ENODEV;
 250                                 goto end;
 251                         }
 252                 }
 253                 if (device->power.flags.power_resources) {
 254                         result = acpi_power_transition(device, state);
 255                         if (result)
 256                                 goto end;
 257                 }
 258         }
 259
 260       end:
 261         if (result)
 262                 printk(KERN_WARNING PREFIX
 263                               "Transitioning device [%s] to D%d\n",
 264                               device->pnp.bus_id, state);
 265         else
 266                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 267                                   "Device [%s] transitioned to D%d\n",
 268                                   device->pnp.bus_id, state));
 269
 270         return result;
 271 }
 272
 273 EXPORT_SYMBOL(acpi_bus_set_power);
 274
 275 /* --------------------------------------------------------------------------
 276                                 Event Management
 277    -------------------------------------------------------------------------- */
 278
 279 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 280
 281 LIST_HEAD(acpi_bus_event_list);
 282 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 283
 284 extern int event_is_open;
 285
 286 int acpi_bus_generate_event(struct acpi_device *device, u8 type, int data)
 287 {
 288         struct acpi_bus_event *event = NULL;
 289         unsigned long flags = 0;
 290
 291
 292         if (!device)
 293                 return -EINVAL;
 294
 295         /* drop event on the floor if no one's listening */
 296         if (!event_is_open)
 297                 return 0;
 298
 299         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 300         if (!event)
 301                 return -ENOMEM;
 302
 303         strcpy(event->device_class, device->pnp.device_class);
 304         strcpy(event->bus_id, device->pnp.bus_id);
 305         event->type = type;
 306         event->data = data;
 307
 308         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 309         list_add_tail(&event->node, &acpi_bus_event_list);
 310         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 311
 312         wake_up_interruptible(&acpi_bus_event_queue);
 313
 314         return 0;
 315 }
 316
 317 EXPORT_SYMBOL(acpi_bus_generate_event);
 318
 319 int acpi_bus_receive_event(struct acpi_bus_event *event)
 320 {
 321         unsigned long flags = 0;
 322         struct acpi_bus_event *entry = NULL;
 323
 324         DECLARE_WAITQUEUE(wait, current);
 325
 326
 327         if (!event)
 328                 return -EINVAL;
 329
 330         if (list_empty(&acpi_bus_event_list)) {
 331
 332                 set_current_state(TASK_INTERRUPTIBLE);
 333                 add_wait_queue(&acpi_bus_event_queue, &wait);
 334
 335                 if (list_empty(&acpi_bus_event_list))
 336                         schedule();
 337
 338                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 339                 set_current_state(TASK_RUNNING);
 340
 341                 if (signal_pending(current))
 342                         return -ERESTARTSYS;
 343         }
 344
 345         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 346         entry =
 347             list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node);
 348         if (entry)
 349                 list_del(&entry->node);
 350         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 351
 352         if (!entry)
 353                 return -ENODEV;
 354
 355         memcpy(event, entry, sizeof(struct acpi_bus_event));
 356
 357         kfree(entry);
 358
 359         return 0;
 360 }
 361
 362 EXPORT_SYMBOL(acpi_bus_receive_event);
 363
 364 /* --------------------------------------------------------------------------
 365                              Notification Handling
 366    -------------------------------------------------------------------------- */
 367
 368 static int
 369 acpi_bus_check_device(struct acpi_device *device, int *status_changed)
 370 {
 371         acpi_status status = 0;
 372         struct acpi_device_status old_status;
 373
 374
 375         if (!device)
 376                 return -EINVAL;
 377
 378         if (status_changed)
 379                 *status_changed = 0;
 380
 381         old_status = device->status;
 382
 383         /*
 384          * Make sure this device's parent is present before we go about
 385          * messing with the device.
 386          */
 387         if (device->parent && !device->parent->status.present) {
 388                 device->status = device->parent->status;
 389                 if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
 390                         if (status_changed)
 391                                 *status_changed = 1;
 392                 }
 393                 return 0;
 394         }
 395
 396         status = acpi_bus_get_status(device);
 397         if (ACPI_FAILURE(status))
 398                 return -ENODEV;
 399
 400         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 401                 return 0;
 402
 403         if (status_changed)
 404                 *status_changed = 1;
 405
 406         /*
 407          * Device Insertion/Removal
 408          */
 409         if ((device->status.present) && !(old_status.present)) {
 410                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 411                 /* TBD: Handle device insertion */
 412         } else if (!(device->status.present) && (old_status.present)) {
 413                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 414                 /* TBD: Handle device removal */
 415         }
 416
 417         return 0;
 418 }
 419
 420 static int acpi_bus_check_scope(struct acpi_device *device)
 421 {
 422         int result = 0;
 423         int status_changed = 0;
 424
 425
 426         if (!device)
 427                 return -EINVAL;
 428
 429         /* Status Change? */
 430         result = acpi_bus_check_device(device, &status_changed);
 431         if (result)
 432                 return result;
 433
 434         if (!status_changed)
 435                 return 0;
 436
 437         /*
 438          * TBD: Enumerate child devices within this device's scope and
 439          *       run acpi_bus_check_device()'s on them.
 440          */
 441
 442         return 0;
 443 }
 444
 445 /**
 446  * acpi_bus_notify
 447  * ---------------
 448  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 449  */
 450 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 451 {
 452         int result = 0;
 453         struct acpi_device *device = NULL;
 454
 455
 456         if (acpi_bus_get_device(handle, &device))
 457                 return;
 458
 459         switch (type) {
 460
 461         case ACPI_NOTIFY_BUS_CHECK:
 462                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 463                                   "Received BUS CHECK notification for device [%s]\n",
 464                                   device->pnp.bus_id));
 465                 result = acpi_bus_check_scope(device);
 466                 /*
 467                  * TBD: We'll need to outsource certain events to non-ACPI
 468                  *      drivers via the device manager (device.c).
 469                  */
 470                 break;
 471
 472         case ACPI_NOTIFY_DEVICE_CHECK:
 473                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 474                                   "Received DEVICE CHECK notification for device [%s]\n",
 475                                   device->pnp.bus_id));
 476                 result = acpi_bus_check_device(device, NULL);
 477                 /*
 478                  * TBD: We'll need to outsource certain events to non-ACPI
 479                  *      drivers via the device manager (device.c).
 480                  */
 481                 break;
 482
 483         case ACPI_NOTIFY_DEVICE_WAKE:
 484                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 485                                   "Received DEVICE WAKE notification for device [%s]\n",
 486                                   device->pnp.bus_id));
 487                 /* TBD */
 488                 break;
 489
 490         case ACPI_NOTIFY_EJECT_REQUEST:
 491                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 492                                   "Received EJECT REQUEST notification for device [%s]\n",
 493                                   device->pnp.bus_id));
 494                 /* TBD */
 495                 break;
 496
 497         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 498                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 499                                   "Received DEVICE CHECK LIGHT notification for device [%s]\n",
 500                                   device->pnp.bus_id));
 501                 /* TBD: Exactly what does 'light' mean? */
 502                 break;
 503
 504         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 505                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 506                                   "Received FREQUENCY MISMATCH notification for device [%s]\n",
 507                                   device->pnp.bus_id));
 508                 /* TBD */
 509                 break;
 510
 511         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 512                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 513                                   "Received BUS MODE MISMATCH notification for device [%s]\n",
 514                                   device->pnp.bus_id));
 515                 /* TBD */
 516                 break;
 517
 518         case ACPI_NOTIFY_POWER_FAULT:
 519                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 520                                   "Received POWER FAULT notification for device [%s]\n",
 521                                   device->pnp.bus_id));
 522                 /* TBD */
 523                 break;
 524
 525         default:
 526                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 527                                   "Received unknown/unsupported notification [%08x]\n",
 528                                   type));
 529                 break;
 530         }
 531
 532         return;
 533 }
 534
 535 /* --------------------------------------------------------------------------
 536                              Initialization/Cleanup
 537    -------------------------------------------------------------------------- */
 538
 539 static int __init acpi_bus_init_irq(void)
 540 {
 541         acpi_status status = AE_OK;
 542         union acpi_object arg = { ACPI_TYPE_INTEGER };
 543         struct acpi_object_list arg_list = { 1, &arg };
 544         char *message = NULL;
 545
 546
 547         /*
 548          * Let the system know what interrupt model we are using by
 549          * evaluating the \_PIC object, if exists.
 550          */
 551
 552         switch (acpi_irq_model) {
 553         case ACPI_IRQ_MODEL_PIC:
 554                 message = "PIC";
 555                 break;
 556         case ACPI_IRQ_MODEL_IOAPIC:
 557                 message = "IOAPIC";
 558                 break;
 559         case ACPI_IRQ_MODEL_IOSAPIC:
 560                 message = "IOSAPIC";
 561                 break;
 562         default:
 563                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 564                 return -ENODEV;
 565         }
 566
 567         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 568
 569         arg.integer.value = acpi_irq_model;
 570
 571         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 572         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 573                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 574                 return -ENODEV;
 575         }
 576
 577         return 0;
 578 }
 579
 580 void __init acpi_early_init(void)
 581 {
 582         acpi_status status = AE_OK;
 583         struct acpi_buffer buffer = { sizeof(acpi_fadt), &acpi_fadt };
 584
 585
 586         if (acpi_disabled)
 587                 return;
 588
 589         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 590
 591         /* enable workarounds, unless strict ACPI spec. compliance */
 592         if (!acpi_strict)
 593                 acpi_gbl_enable_interpreter_slack = TRUE;
 594
 595         status = acpi_initialize_subsystem();
 596         if (ACPI_FAILURE(status)) {
 597                 printk(KERN_ERR PREFIX
 598                        "Unable to initialize the ACPI Interpreter\n");
 599                 goto error0;
 600         }
 601
 602         status = acpi_load_tables();
 603         if (ACPI_FAILURE(status)) {
 604                 printk(KERN_ERR PREFIX
 605                        "Unable to load the System Description Tables\n");
 606                 goto error0;
 607         }
 608
 609         /*
 610          * Get a separate copy of the FADT for use by other drivers.
 611          */
 612         status = acpi_get_table(ACPI_TABLE_ID_FADT, 1, &buffer);
 613         if (ACPI_FAILURE(status)) {
 614                 printk(KERN_ERR PREFIX "Unable to get the FADT\n");
 615                 goto error0;
 616         }
 617 #ifdef CONFIG_X86
 618         if (!acpi_ioapic) {
 619                 extern acpi_interrupt_flags acpi_sci_flags;
 620
 621                 /* compatible (0) means level (3) */
 622                 if (acpi_sci_flags.trigger == 0)
 623                         acpi_sci_flags.trigger = 3;
 624
 625                 /* Set PIC-mode SCI trigger type */
 626                 acpi_pic_sci_set_trigger(acpi_fadt.sci_int,
 627                                          acpi_sci_flags.trigger);
 628         } else {
 629                 extern int acpi_sci_override_gsi;
 630                 /*
 631                  * now that acpi_fadt is initialized,
 632                  * update it with result from INT_SRC_OVR parsing
 633                  */
 634                 acpi_fadt.sci_int = acpi_sci_override_gsi;
 635         }
 636 #endif
 637
 638         status =
 639             acpi_enable_subsystem(~
 640                                   (ACPI_NO_HARDWARE_INIT |
 641                                    ACPI_NO_ACPI_ENABLE));
 642         if (ACPI_FAILURE(status)) {
 643                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 644                 goto error0;
 645         }
 646
 647         return;
 648
 649       error0:
 650         disable_acpi();
 651         return;
 652 }
 653
 654 static int __init acpi_bus_init(void)
 655 {
 656         int result = 0;
 657         acpi_status status = AE_OK;
 658         extern acpi_status acpi_os_initialize1(void);
 659
 660
 661         status = acpi_os_initialize1();
 662
 663         status =
 664             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 665         if (ACPI_FAILURE(status)) {
 666                 printk(KERN_ERR PREFIX
 667                        "Unable to start the ACPI Interpreter\n");
 668                 goto error1;
 669         }
 670
 671         if (ACPI_FAILURE(status)) {
 672                 printk(KERN_ERR PREFIX
 673                        "Unable to initialize ACPI OS objects\n");
 674                 goto error1;
 675         }
 676 #ifdef CONFIG_ACPI_EC
 677         /*
 678          * ACPI 2.0 requires the EC driver to be loaded and work before
 679          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 680          * is called).
 681          *
 682          * This is accomplished by looking for the ECDT table, and getting
 683          * the EC parameters out of that.
 684          */
 685         status = acpi_ec_ecdt_probe();
 686         /* Ignore result. Not having an ECDT is not fatal. */
 687 #endif
 688
 689         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 690         if (ACPI_FAILURE(status)) {
 691                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 692                 goto error1;
 693         }
 694
 695         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 696
 697         /*
 698          * Get the system interrupt model and evaluate \_PIC.
 699          */
 700         result = acpi_bus_init_irq();
 701         if (result)
 702                 goto error1;
 703
 704         /*
 705          * Register the for all standard device notifications.
 706          */
 707         status =
 708             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 709                                         &acpi_bus_notify, NULL);
 710         if (ACPI_FAILURE(status)) {
 711                 printk(KERN_ERR PREFIX
 712                        "Unable to register for device notifications\n");
 713                 goto error1;
 714         }
 715
 716         /*
 717          * Create the top ACPI proc directory
 718          */
 719         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 720
 721         return 0;
 722
 723         /* Mimic structured exception handling */
 724       error1:
 725         acpi_terminate();
 726         return -ENODEV;
 727 }
 728
 729 decl_subsys(acpi, NULL, NULL);
 730
 731 static int __init acpi_init(void)
 732 {
 733         int result = 0;
 734
 735
 736         if (acpi_disabled) {
 737                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 738                 return -ENODEV;
 739         }
 740
 741         firmware_register(&acpi_subsys);
 742
 743         result = acpi_bus_init();
 744
 745         if (!result) {
 746 #ifdef CONFIG_PM_LEGACY
 747                 if (!PM_IS_ACTIVE())
 748                         pm_active = 1;
 749                 else {
 750                         printk(KERN_INFO PREFIX
 751                                "APM is already active, exiting\n");
 752                         disable_acpi();
 753                         result = -ENODEV;
 754                 }
 755 #endif
 756         } else
 757                 disable_acpi();
 758
 759         return result;
 760 }
 761
 762 subsys_initcall(acpi_init);