drivers/acpi/bus.c

   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/kernel.h>
  29 #include <linux/list.h>
  30 #include <linux/sched.h>
  31 #include <linux/pm.h>
  32 #include <linux/pm_legacy.h>
  33 #include <linux/device.h>
  34 #include <linux/proc_fs.h>
  35 #ifdef CONFIG_X86
  36 #include <asm/mpspec.h>
  37 #endif
  38 #include <acpi/acpi_bus.h>
  39 #include <acpi/acpi_drivers.h>
  40
  41 #define _COMPONENT              ACPI_BUS_COMPONENT
  42 ACPI_MODULE_NAME("bus");
  43 #ifdef  CONFIG_X86
  44 extern void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger);
  45 #endif
  46
  47 struct acpi_device *acpi_root;
  48 struct proc_dir_entry *acpi_root_dir;
  49 EXPORT_SYMBOL(acpi_root_dir);
  50
  51 #define STRUCT_TO_INT(s)        (*((int*)&s))
  52
  53 /* --------------------------------------------------------------------------
  54                                 Device Management
  55    -------------------------------------------------------------------------- */
  56
  57 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
  58 {
  59         acpi_status status = AE_OK;
  60
  61
  62         if (!device)
  63                 return -EINVAL;
  64
  65         /* TBD: Support fixed-feature devices */
  66
  67         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
  68         if (ACPI_FAILURE(status) || !*device) {
  69                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
  70                                   handle));
  71                 return -ENODEV;
  72         }
  73
  74         return 0;
  75 }
  76
  77 EXPORT_SYMBOL(acpi_bus_get_device);
  78
  79 int acpi_bus_get_status(struct acpi_device *device)
  80 {
  81         acpi_status status = AE_OK;
  82         unsigned long sta = 0;
  83
  84
  85         if (!device)
  86                 return -EINVAL;
  87
  88         /*
  89          * Evaluate _STA if present.
  90          */
  91         if (device->flags.dynamic_status) {
  92                 status =
  93                     acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
  94                 if (ACPI_FAILURE(status))
  95                         return -ENODEV;
  96                 STRUCT_TO_INT(device->status) = (int)sta;
  97         }
  98
  99         /*
 100          * Otherwise we assume the status of our parent (unless we don't
 101          * have one, in which case status is implied).
 102          */
 103         else if (device->parent)
 104                 device->status = device->parent->status;
 105         else
 106                 STRUCT_TO_INT(device->status) =
 107                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 108                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 109
 110         if (device->status.functional && !device->status.present) {
 111                 printk(KERN_WARNING PREFIX "Device [%s] status [%08x]: "
 112                        "functional but not present; setting present\n",
 113                        device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status));
 114                 device->status.present = 1;
 115         }
 116
 117         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 118                           device->pnp.bus_id,
 119                           (u32) STRUCT_TO_INT(device->status)));
 120
 121         return 0;
 122 }
 123
 124 EXPORT_SYMBOL(acpi_bus_get_status);
 125
 126 /* --------------------------------------------------------------------------
 127                                  Power Management
 128    -------------------------------------------------------------------------- */
 129
 130 int acpi_bus_get_power(acpi_handle handle, int *state)
 131 {
 132         int result = 0;
 133         acpi_status status = 0;
 134         struct acpi_device *device = NULL;
 135         unsigned long psc = 0;
 136
 137
 138         result = acpi_bus_get_device(handle, &device);
 139         if (result)
 140                 return result;
 141
 142         *state = ACPI_STATE_UNKNOWN;
 143
 144         if (!device->flags.power_manageable) {
 145                 /* TBD: Non-recursive algorithm for walking up hierarchy */
 146                 if (device->parent)
 147                         *state = device->parent->power.state;
 148                 else
 149                         *state = ACPI_STATE_D0;
 150         } else {
 151                 /*
 152                  * Get the device's power state either directly (via _PSC) or
 153                  * indirectly (via power resources).
 154                  */
 155                 if (device->power.flags.explicit_get) {
 156                         status = acpi_evaluate_integer(device->handle, "_PSC",
 157                                                        NULL, &psc);
 158                         if (ACPI_FAILURE(status))
 159                                 return -ENODEV;
 160                         device->power.state = (int)psc;
 161                 } else if (device->power.flags.power_resources) {
 162                         result = acpi_power_get_inferred_state(device);
 163                         if (result)
 164                                 return result;
 165                 }
 166
 167                 *state = device->power.state;
 168         }
 169
 170         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
 171                           device->pnp.bus_id, device->power.state));
 172
 173         return 0;
 174 }
 175
 176 EXPORT_SYMBOL(acpi_bus_get_power);
 177
 178 int acpi_bus_set_power(acpi_handle handle, int state)
 179 {
 180         int result = 0;
 181         acpi_status status = AE_OK;
 182         struct acpi_device *device = NULL;
 183         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 184
 185
 186         result = acpi_bus_get_device(handle, &device);
 187         if (result)
 188                 return result;
 189
 190         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
 191                 return -EINVAL;
 192
 193         /* Make sure this is a valid target state */
 194
 195         if (!device->flags.power_manageable) {
 196                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
 197                                 device->dev.kobj.name));
 198                 return -ENODEV;
 199         }
 200         /*
 201          * Get device's current power state if it's unknown
 202          * This means device power state isn't initialized or previous setting failed
 203          */
 204         if ((device->power.state == ACPI_STATE_UNKNOWN) || device->flags.force_power_state)
 205                 acpi_bus_get_power(device->handle, &device->power.state);
 206         if ((state == device->power.state) && !device->flags.force_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 #ifdef CONFIG_ACPI_PROC_EVENT
 280 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 281
 282 LIST_HEAD(acpi_bus_event_list);
 283 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 284
 285 extern int event_is_open;
 286
 287 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 288 {
 289         struct acpi_bus_event *event = NULL;
 290         unsigned long flags = 0;
 291
 292
 293         if (!device)
 294                 return -EINVAL;
 295
 296         /* drop event on the floor if no one's listening */
 297         if (!event_is_open)
 298                 return 0;
 299
 300         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 301         if (!event)
 302                 return -ENOMEM;
 303
 304         strcpy(event->device_class, device->pnp.device_class);
 305         strcpy(event->bus_id, device->pnp.bus_id);
 306         event->type = type;
 307         event->data = data;
 308
 309         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 310         list_add_tail(&event->node, &acpi_bus_event_list);
 311         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 312
 313         wake_up_interruptible(&acpi_bus_event_queue);
 314
 315         return 0;
 316 }
 317
 318 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 319
 320 int acpi_bus_receive_event(struct acpi_bus_event *event)
 321 {
 322         unsigned long flags = 0;
 323         struct acpi_bus_event *entry = NULL;
 324
 325         DECLARE_WAITQUEUE(wait, current);
 326
 327
 328         if (!event)
 329                 return -EINVAL;
 330
 331         if (list_empty(&acpi_bus_event_list)) {
 332
 333                 set_current_state(TASK_INTERRUPTIBLE);
 334                 add_wait_queue(&acpi_bus_event_queue, &wait);
 335
 336                 if (list_empty(&acpi_bus_event_list))
 337                         schedule();
 338
 339                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 340                 set_current_state(TASK_RUNNING);
 341
 342                 if (signal_pending(current))
 343                         return -ERESTARTSYS;
 344         }
 345
 346         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 347         entry =
 348             list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node);
 349         if (entry)
 350                 list_del(&entry->node);
 351         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 352
 353         if (!entry)
 354                 return -ENODEV;
 355
 356         memcpy(event, entry, sizeof(struct acpi_bus_event));
 357
 358         kfree(entry);
 359
 360         return 0;
 361 }
 362
 363 EXPORT_SYMBOL(acpi_bus_receive_event);
 364 #endif  /* CONFIG_ACPI_PROC_EVENT */
 365
 366 /* --------------------------------------------------------------------------
 367                              Notification Handling
 368    -------------------------------------------------------------------------- */
 369
 370 static int
 371 acpi_bus_check_device(struct acpi_device *device, int *status_changed)
 372 {
 373         acpi_status status = 0;
 374         struct acpi_device_status old_status;
 375
 376
 377         if (!device)
 378                 return -EINVAL;
 379
 380         if (status_changed)
 381                 *status_changed = 0;
 382
 383         old_status = device->status;
 384
 385         /*
 386          * Make sure this device's parent is present before we go about
 387          * messing with the device.
 388          */
 389         if (device->parent && !device->parent->status.present) {
 390                 device->status = device->parent->status;
 391                 if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
 392                         if (status_changed)
 393                                 *status_changed = 1;
 394                 }
 395                 return 0;
 396         }
 397
 398         status = acpi_bus_get_status(device);
 399         if (ACPI_FAILURE(status))
 400                 return -ENODEV;
 401
 402         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 403                 return 0;
 404
 405         if (status_changed)
 406                 *status_changed = 1;
 407
 408         /*
 409          * Device Insertion/Removal
 410          */
 411         if ((device->status.present) && !(old_status.present)) {
 412                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 413                 /* TBD: Handle device insertion */
 414         } else if (!(device->status.present) && (old_status.present)) {
 415                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 416                 /* TBD: Handle device removal */
 417         }
 418
 419         return 0;
 420 }
 421
 422 static int acpi_bus_check_scope(struct acpi_device *device)
 423 {
 424         int result = 0;
 425         int status_changed = 0;
 426
 427
 428         if (!device)
 429                 return -EINVAL;
 430
 431         /* Status Change? */
 432         result = acpi_bus_check_device(device, &status_changed);
 433         if (result)
 434                 return result;
 435
 436         if (!status_changed)
 437                 return 0;
 438
 439         /*
 440          * TBD: Enumerate child devices within this device's scope and
 441          *       run acpi_bus_check_device()'s on them.
 442          */
 443
 444         return 0;
 445 }
 446
 447 /**
 448  * acpi_bus_notify
 449  * ---------------
 450  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 451  */
 452 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 453 {
 454         int result = 0;
 455         struct acpi_device *device = NULL;
 456
 457
 458         if (acpi_bus_get_device(handle, &device))
 459                 return;
 460
 461         switch (type) {
 462
 463         case ACPI_NOTIFY_BUS_CHECK:
 464                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 465                                   "Received BUS CHECK notification for device [%s]\n",
 466                                   device->pnp.bus_id));
 467                 result = acpi_bus_check_scope(device);
 468                 /*
 469                  * TBD: We'll need to outsource certain events to non-ACPI
 470                  *      drivers via the device manager (device.c).
 471                  */
 472                 break;
 473
 474         case ACPI_NOTIFY_DEVICE_CHECK:
 475                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 476                                   "Received DEVICE CHECK notification for device [%s]\n",
 477                                   device->pnp.bus_id));
 478                 result = acpi_bus_check_device(device, NULL);
 479                 /*
 480                  * TBD: We'll need to outsource certain events to non-ACPI
 481                  *      drivers via the device manager (device.c).
 482                  */
 483                 break;
 484
 485         case ACPI_NOTIFY_DEVICE_WAKE:
 486                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 487                                   "Received DEVICE WAKE notification for device [%s]\n",
 488                                   device->pnp.bus_id));
 489                 /* TBD */
 490                 break;
 491
 492         case ACPI_NOTIFY_EJECT_REQUEST:
 493                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 494                                   "Received EJECT REQUEST notification for device [%s]\n",
 495                                   device->pnp.bus_id));
 496                 /* TBD */
 497                 break;
 498
 499         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 500                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 501                                   "Received DEVICE CHECK LIGHT notification for device [%s]\n",
 502                                   device->pnp.bus_id));
 503                 /* TBD: Exactly what does 'light' mean? */
 504                 break;
 505
 506         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 507                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 508                                   "Received FREQUENCY MISMATCH notification for device [%s]\n",
 509                                   device->pnp.bus_id));
 510                 /* TBD */
 511                 break;
 512
 513         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 514                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 515                                   "Received BUS MODE MISMATCH notification for device [%s]\n",
 516                                   device->pnp.bus_id));
 517                 /* TBD */
 518                 break;
 519
 520         case ACPI_NOTIFY_POWER_FAULT:
 521                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 522                                   "Received POWER FAULT notification for device [%s]\n",
 523                                   device->pnp.bus_id));
 524                 /* TBD */
 525                 break;
 526
 527         default:
 528                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 529                                   "Received unknown/unsupported notification [%08x]\n",
 530                                   type));
 531                 break;
 532         }
 533
 534         return;
 535 }
 536
 537 /* --------------------------------------------------------------------------
 538                              Initialization/Cleanup
 539    -------------------------------------------------------------------------- */
 540
 541 static int __init acpi_bus_init_irq(void)
 542 {
 543         acpi_status status = AE_OK;
 544         union acpi_object arg = { ACPI_TYPE_INTEGER };
 545         struct acpi_object_list arg_list = { 1, &arg };
 546         char *message = NULL;
 547
 548
 549         /*
 550          * Let the system know what interrupt model we are using by
 551          * evaluating the \_PIC object, if exists.
 552          */
 553
 554         switch (acpi_irq_model) {
 555         case ACPI_IRQ_MODEL_PIC:
 556                 message = "PIC";
 557                 break;
 558         case ACPI_IRQ_MODEL_IOAPIC:
 559                 message = "IOAPIC";
 560                 break;
 561         case ACPI_IRQ_MODEL_IOSAPIC:
 562                 message = "IOSAPIC";
 563                 break;
 564         case ACPI_IRQ_MODEL_PLATFORM:
 565                 message = "platform specific model";
 566                 break;
 567         default:
 568                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 569                 return -ENODEV;
 570         }
 571
 572         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 573
 574         arg.integer.value = acpi_irq_model;
 575
 576         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 577         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 578                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 579                 return -ENODEV;
 580         }
 581
 582         return 0;
 583 }
 584
 585 acpi_native_uint acpi_gbl_permanent_mmap;
 586
 587
 588 void __init acpi_early_init(void)
 589 {
 590         acpi_status status = AE_OK;
 591
 592         if (acpi_disabled)
 593                 return;
 594
 595         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 596
 597         /* enable workarounds, unless strict ACPI spec. compliance */
 598         if (!acpi_strict)
 599                 acpi_gbl_enable_interpreter_slack = TRUE;
 600
 601         acpi_gbl_permanent_mmap = 1;
 602
 603         status = acpi_reallocate_root_table();
 604         if (ACPI_FAILURE(status)) {
 605                 printk(KERN_ERR PREFIX
 606                        "Unable to reallocate ACPI tables\n");
 607                 goto error0;
 608         }
 609
 610         status = acpi_initialize_subsystem();
 611         if (ACPI_FAILURE(status)) {
 612                 printk(KERN_ERR PREFIX
 613                        "Unable to initialize the ACPI Interpreter\n");
 614                 goto error0;
 615         }
 616
 617         status = acpi_load_tables();
 618         if (ACPI_FAILURE(status)) {
 619                 printk(KERN_ERR PREFIX
 620                        "Unable to load the System Description Tables\n");
 621                 goto error0;
 622         }
 623
 624 #ifdef CONFIG_X86
 625         if (!acpi_ioapic) {
 626                 extern u8 acpi_sci_flags;
 627
 628                 /* compatible (0) means level (3) */
 629                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 630                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 631                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 632                 }
 633                 /* Set PIC-mode SCI trigger type */
 634                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 635                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 636         } else {
 637                 extern int acpi_sci_override_gsi;
 638                 /*
 639                  * now that acpi_gbl_FADT is initialized,
 640                  * update it with result from INT_SRC_OVR parsing
 641                  */
 642                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 643         }
 644 #endif
 645
 646         status =
 647             acpi_enable_subsystem(~
 648                                   (ACPI_NO_HARDWARE_INIT |
 649                                    ACPI_NO_ACPI_ENABLE));
 650         if (ACPI_FAILURE(status)) {
 651                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 652                 goto error0;
 653         }
 654
 655         return;
 656
 657       error0:
 658         disable_acpi();
 659         return;
 660 }
 661
 662 static int __init acpi_bus_init(void)
 663 {
 664         int result = 0;
 665         acpi_status status = AE_OK;
 666         extern acpi_status acpi_os_initialize1(void);
 667
 668
 669         status = acpi_os_initialize1();
 670
 671         status =
 672             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 673         if (ACPI_FAILURE(status)) {
 674                 printk(KERN_ERR PREFIX
 675                        "Unable to start the ACPI Interpreter\n");
 676                 goto error1;
 677         }
 678
 679         if (ACPI_FAILURE(status)) {
 680                 printk(KERN_ERR PREFIX
 681                        "Unable to initialize ACPI OS objects\n");
 682                 goto error1;
 683         }
 684 #ifdef CONFIG_ACPI_EC
 685         /*
 686          * ACPI 2.0 requires the EC driver to be loaded and work before
 687          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 688          * is called).
 689          *
 690          * This is accomplished by looking for the ECDT table, and getting
 691          * the EC parameters out of that.
 692          */
 693         status = acpi_ec_ecdt_probe();
 694         /* Ignore result. Not having an ECDT is not fatal. */
 695 #endif
 696
 697         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 698         if (ACPI_FAILURE(status)) {
 699                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 700                 goto error1;
 701         }
 702
 703         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 704
 705         /* Initialize sleep structures */
 706         acpi_sleep_init();
 707
 708         /*
 709          * Get the system interrupt model and evaluate \_PIC.
 710          */
 711         result = acpi_bus_init_irq();
 712         if (result)
 713                 goto error1;
 714
 715         /*
 716          * Register the for all standard device notifications.
 717          */
 718         status =
 719             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 720                                         &acpi_bus_notify, NULL);
 721         if (ACPI_FAILURE(status)) {
 722                 printk(KERN_ERR PREFIX
 723                        "Unable to register for device notifications\n");
 724                 goto error1;
 725         }
 726
 727         /*
 728          * Create the top ACPI proc directory
 729          */
 730         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 731
 732         return 0;
 733
 734         /* Mimic structured exception handling */
 735       error1:
 736         acpi_terminate();
 737         return -ENODEV;
 738 }
 739
 740 decl_subsys(acpi, NULL, NULL);
 741
 742 static int __init acpi_init(void)
 743 {
 744         int result = 0;
 745
 746
 747         if (acpi_disabled) {
 748                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 749                 return -ENODEV;
 750         }
 751
 752         result = firmware_register(&acpi_subsys);
 753         if (result < 0)
 754                 printk(KERN_WARNING "%s: firmware_register error: %d\n",
 755                         __FUNCTION__, result);
 756
 757         result = acpi_bus_init();
 758
 759         if (!result) {
 760 #ifdef CONFIG_PM_LEGACY
 761                 if (!PM_IS_ACTIVE())
 762                         pm_active = 1;
 763                 else {
 764                         printk(KERN_INFO PREFIX
 765                                "APM is already active, exiting\n");
 766                         disable_acpi();
 767                         result = -ENODEV;
 768                 }
 769 #endif
 770         } else
 771                 disable_acpi();
 772
 773         return result;
 774 }
 775
 776 subsys_initcall(acpi_init);