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/device.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/acpi.h>
  35 #ifdef CONFIG_X86
  36 #include <asm/mpspec.h>
  37 #endif
  38 #include <linux/pci.h>
  39 #include <acpi/acpi_bus.h>
  40 #include <acpi/acpi_drivers.h>
  41
  42 #include "internal.h"
  43
  44 #define _COMPONENT              ACPI_BUS_COMPONENT
  45 ACPI_MODULE_NAME("bus");
  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 static int set_power_nocheck(const struct dmi_system_id *id)
  54 {
  55         printk(KERN_NOTICE PREFIX "%s detected - "
  56                 "disable power check in power transistion\n", id->ident);
  57         acpi_power_nocheck = 1;
  58         return 0;
  59 }
  60 static struct dmi_system_id __cpuinitdata power_nocheck_dmi_table[] = {
  61         {
  62         set_power_nocheck, "HP Pavilion 05", {
  63         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
  64         DMI_MATCH(DMI_SYS_VENDOR, "HP Pavilion 05"),
  65         DMI_MATCH(DMI_PRODUCT_VERSION, "2001211RE101GLEND") }, NULL},
  66         {},
  67 };
  68
  69
  70 /* --------------------------------------------------------------------------
  71                                 Device Management
  72    -------------------------------------------------------------------------- */
  73
  74 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
  75 {
  76         acpi_status status = AE_OK;
  77
  78
  79         if (!device)
  80                 return -EINVAL;
  81
  82         /* TBD: Support fixed-feature devices */
  83
  84         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
  85         if (ACPI_FAILURE(status) || !*device) {
  86                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
  87                                   handle));
  88                 return -ENODEV;
  89         }
  90
  91         return 0;
  92 }
  93
  94 EXPORT_SYMBOL(acpi_bus_get_device);
  95
  96 int acpi_bus_get_status(struct acpi_device *device)
  97 {
  98         acpi_status status = AE_OK;
  99         unsigned long long sta = 0;
 100
 101
 102         if (!device)
 103                 return -EINVAL;
 104
 105         /*
 106          * Evaluate _STA if present.
 107          */
 108         if (device->flags.dynamic_status) {
 109                 status =
 110                     acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
 111                 if (ACPI_FAILURE(status))
 112                         return -ENODEV;
 113                 STRUCT_TO_INT(device->status) = (int)sta;
 114         }
 115
 116         /*
 117          * According to ACPI spec some device can be present and functional
 118          * even if the parent is not present but functional.
 119          * In such conditions the child device should not inherit the status
 120          * from the parent.
 121          */
 122         else
 123                 STRUCT_TO_INT(device->status) =
 124                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 125                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 126
 127         if (device->status.functional && !device->status.present) {
 128                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 129                        "functional but not present;\n",
 130                         device->pnp.bus_id,
 131                         (u32) STRUCT_TO_INT(device->status)));
 132         }
 133
 134         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 135                           device->pnp.bus_id,
 136                           (u32) STRUCT_TO_INT(device->status)));
 137
 138         return 0;
 139 }
 140
 141 EXPORT_SYMBOL(acpi_bus_get_status);
 142
 143 void acpi_bus_private_data_handler(acpi_handle handle,
 144                                    u32 function, void *context)
 145 {
 146         return;
 147 }
 148 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 149
 150 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 151 {
 152         acpi_status status = AE_OK;
 153
 154         if (!*data)
 155                 return -EINVAL;
 156
 157         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 158         if (ACPI_FAILURE(status) || !*data) {
 159                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 160                                 handle));
 161                 return -ENODEV;
 162         }
 163
 164         return 0;
 165 }
 166 EXPORT_SYMBOL(acpi_bus_get_private_data);
 167
 168 /* --------------------------------------------------------------------------
 169                                  Power Management
 170    -------------------------------------------------------------------------- */
 171
 172 int acpi_bus_get_power(acpi_handle handle, int *state)
 173 {
 174         int result = 0;
 175         acpi_status status = 0;
 176         struct acpi_device *device = NULL;
 177         unsigned long long psc = 0;
 178
 179
 180         result = acpi_bus_get_device(handle, &device);
 181         if (result)
 182                 return result;
 183
 184         *state = ACPI_STATE_UNKNOWN;
 185
 186         if (!device->flags.power_manageable) {
 187                 /* TBD: Non-recursive algorithm for walking up hierarchy */
 188                 if (device->parent)
 189                         *state = device->parent->power.state;
 190                 else
 191                         *state = ACPI_STATE_D0;
 192         } else {
 193                 /*
 194                  * Get the device's power state either directly (via _PSC) or
 195                  * indirectly (via power resources).
 196                  */
 197                 if (device->power.flags.explicit_get) {
 198                         status = acpi_evaluate_integer(device->handle, "_PSC",
 199                                                        NULL, &psc);
 200                         if (ACPI_FAILURE(status))
 201                                 return -ENODEV;
 202                         device->power.state = (int)psc;
 203                 } else if (device->power.flags.power_resources) {
 204                         result = acpi_power_get_inferred_state(device);
 205                         if (result)
 206                                 return result;
 207                 }
 208
 209                 *state = device->power.state;
 210         }
 211
 212         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
 213                           device->pnp.bus_id, device->power.state));
 214
 215         return 0;
 216 }
 217
 218 EXPORT_SYMBOL(acpi_bus_get_power);
 219
 220 int acpi_bus_set_power(acpi_handle handle, int state)
 221 {
 222         int result = 0;
 223         acpi_status status = AE_OK;
 224         struct acpi_device *device = NULL;
 225         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 226
 227
 228         result = acpi_bus_get_device(handle, &device);
 229         if (result)
 230                 return result;
 231
 232         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
 233                 return -EINVAL;
 234
 235         /* Make sure this is a valid target state */
 236
 237         if (!device->flags.power_manageable) {
 238                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
 239                                 kobject_name(&device->dev.kobj)));
 240                 return -ENODEV;
 241         }
 242         /*
 243          * Get device's current power state
 244          */
 245         if (!acpi_power_nocheck) {
 246                 /*
 247                  * Maybe the incorrect power state is returned on the bogus
 248                  * bios, which is different with the real power state.
 249                  * For example: the bios returns D0 state and the real power
 250                  * state is D3. OS expects to set the device to D0 state. In
 251                  * such case if OS uses the power state returned by the BIOS,
 252                  * the device can't be transisted to the correct power state.
 253                  * So if the acpi_power_nocheck is set, it is unnecessary to
 254                  * get the power state by calling acpi_bus_get_power.
 255                  */
 256                 acpi_bus_get_power(device->handle, &device->power.state);
 257         }
 258         if ((state == device->power.state) && !device->flags.force_power_state) {
 259                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
 260                                   state));
 261                 return 0;
 262         }
 263
 264         if (!device->power.states[state].flags.valid) {
 265                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
 266                 return -ENODEV;
 267         }
 268         if (device->parent && (state < device->parent->power.state)) {
 269                 printk(KERN_WARNING PREFIX
 270                               "Cannot set device to a higher-powered"
 271                               " state than parent\n");
 272                 return -ENODEV;
 273         }
 274
 275         /*
 276          * Transition Power
 277          * ----------------
 278          * On transitions to a high-powered state we first apply power (via
 279          * power resources) then evalute _PSx.  Conversly for transitions to
 280          * a lower-powered state.
 281          */
 282         if (state < device->power.state) {
 283                 if (device->power.flags.power_resources) {
 284                         result = acpi_power_transition(device, state);
 285                         if (result)
 286                                 goto end;
 287                 }
 288                 if (device->power.states[state].flags.explicit_set) {
 289                         status = acpi_evaluate_object(device->handle,
 290                                                       object_name, NULL, NULL);
 291                         if (ACPI_FAILURE(status)) {
 292                                 result = -ENODEV;
 293                                 goto end;
 294                         }
 295                 }
 296         } else {
 297                 if (device->power.states[state].flags.explicit_set) {
 298                         status = acpi_evaluate_object(device->handle,
 299                                                       object_name, NULL, NULL);
 300                         if (ACPI_FAILURE(status)) {
 301                                 result = -ENODEV;
 302                                 goto end;
 303                         }
 304                 }
 305                 if (device->power.flags.power_resources) {
 306                         result = acpi_power_transition(device, state);
 307                         if (result)
 308                                 goto end;
 309                 }
 310         }
 311
 312       end:
 313         if (result)
 314                 printk(KERN_WARNING PREFIX
 315                               "Device [%s] failed to transition to D%d\n",
 316                               device->pnp.bus_id, state);
 317         else {
 318                 device->power.state = state;
 319                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 320                                   "Device [%s] transitioned to D%d\n",
 321                                   device->pnp.bus_id, state));
 322         }
 323
 324         return result;
 325 }
 326
 327 EXPORT_SYMBOL(acpi_bus_set_power);
 328
 329 bool acpi_bus_power_manageable(acpi_handle handle)
 330 {
 331         struct acpi_device *device;
 332         int result;
 333
 334         result = acpi_bus_get_device(handle, &device);
 335         return result ? false : device->flags.power_manageable;
 336 }
 337
 338 EXPORT_SYMBOL(acpi_bus_power_manageable);
 339
 340 bool acpi_bus_can_wakeup(acpi_handle handle)
 341 {
 342         struct acpi_device *device;
 343         int result;
 344
 345         result = acpi_bus_get_device(handle, &device);
 346         return result ? false : device->wakeup.flags.valid;
 347 }
 348
 349 EXPORT_SYMBOL(acpi_bus_can_wakeup);
 350
 351 /* --------------------------------------------------------------------------
 352                                 Event Management
 353    -------------------------------------------------------------------------- */
 354
 355 #ifdef CONFIG_ACPI_PROC_EVENT
 356 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 357
 358 LIST_HEAD(acpi_bus_event_list);
 359 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 360
 361 extern int event_is_open;
 362
 363 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 364 {
 365         struct acpi_bus_event *event;
 366         unsigned long flags = 0;
 367
 368         /* drop event on the floor if no one's listening */
 369         if (!event_is_open)
 370                 return 0;
 371
 372         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 373         if (!event)
 374                 return -ENOMEM;
 375
 376         strcpy(event->device_class, device_class);
 377         strcpy(event->bus_id, bus_id);
 378         event->type = type;
 379         event->data = data;
 380
 381         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 382         list_add_tail(&event->node, &acpi_bus_event_list);
 383         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 384
 385         wake_up_interruptible(&acpi_bus_event_queue);
 386
 387         return 0;
 388
 389 }
 390
 391 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 392
 393 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 394 {
 395         if (!device)
 396                 return -EINVAL;
 397         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 398                                              device->pnp.bus_id, type, data);
 399 }
 400
 401 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 402
 403 int acpi_bus_receive_event(struct acpi_bus_event *event)
 404 {
 405         unsigned long flags = 0;
 406         struct acpi_bus_event *entry = NULL;
 407
 408         DECLARE_WAITQUEUE(wait, current);
 409
 410
 411         if (!event)
 412                 return -EINVAL;
 413
 414         if (list_empty(&acpi_bus_event_list)) {
 415
 416                 set_current_state(TASK_INTERRUPTIBLE);
 417                 add_wait_queue(&acpi_bus_event_queue, &wait);
 418
 419                 if (list_empty(&acpi_bus_event_list))
 420                         schedule();
 421
 422                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 423                 set_current_state(TASK_RUNNING);
 424
 425                 if (signal_pending(current))
 426                         return -ERESTARTSYS;
 427         }
 428
 429         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 430         if (!list_empty(&acpi_bus_event_list)) {
 431                 entry = list_entry(acpi_bus_event_list.next,
 432                                    struct acpi_bus_event, node);
 433                 list_del(&entry->node);
 434         }
 435         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 436
 437         if (!entry)
 438                 return -ENODEV;
 439
 440         memcpy(event, entry, sizeof(struct acpi_bus_event));
 441
 442         kfree(entry);
 443
 444         return 0;
 445 }
 446
 447 #endif  /* CONFIG_ACPI_PROC_EVENT */
 448
 449 /* --------------------------------------------------------------------------
 450                              Notification Handling
 451    -------------------------------------------------------------------------- */
 452
 453 static void acpi_bus_check_device(struct acpi_device *device)
 454 {
 455         acpi_status status;
 456         struct acpi_device_status old_status;
 457
 458         if (!device)
 459                 return;
 460
 461         old_status = device->status;
 462
 463         /*
 464          * Make sure this device's parent is present before we go about
 465          * messing with the device.
 466          */
 467         if (device->parent && !device->parent->status.present) {
 468                 device->status = device->parent->status;
 469                 return;
 470         }
 471
 472         status = acpi_bus_get_status(device);
 473         if (ACPI_FAILURE(status))
 474                 return;
 475
 476         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 477                 return;
 478
 479         /*
 480          * Device Insertion/Removal
 481          */
 482         if ((device->status.present) && !(old_status.present)) {
 483                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 484                 /* TBD: Handle device insertion */
 485         } else if (!(device->status.present) && (old_status.present)) {
 486                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 487                 /* TBD: Handle device removal */
 488         }
 489 }
 490
 491 static void acpi_bus_check_scope(struct acpi_device *device)
 492 {
 493         if (!device)
 494                 return;
 495
 496         /* Status Change? */
 497         acpi_bus_check_device(device);
 498
 499         /*
 500          * TBD: Enumerate child devices within this device's scope and
 501          *       run acpi_bus_check_device()'s on them.
 502          */
 503 }
 504
 505 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 506 int register_acpi_bus_notifier(struct notifier_block *nb)
 507 {
 508         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 509 }
 510 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 511
 512 void unregister_acpi_bus_notifier(struct notifier_block *nb)
 513 {
 514         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 515 }
 516 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 517
 518 /**
 519  * acpi_bus_notify
 520  * ---------------
 521  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 522  */
 523 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 524 {
 525         struct acpi_device *device = NULL;
 526         struct acpi_driver *driver;
 527
 528         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 529                           type, handle));
 530
 531         blocking_notifier_call_chain(&acpi_bus_notify_list,
 532                 type, (void *)handle);
 533
 534         if (acpi_bus_get_device(handle, &device))
 535                 return;
 536
 537         switch (type) {
 538
 539         case ACPI_NOTIFY_BUS_CHECK:
 540                 acpi_bus_check_scope(device);
 541                 /*
 542                  * TBD: We'll need to outsource certain events to non-ACPI
 543                  *      drivers via the device manager (device.c).
 544                  */
 545                 break;
 546
 547         case ACPI_NOTIFY_DEVICE_CHECK:
 548                 acpi_bus_check_device(device);
 549                 /*
 550                  * TBD: We'll need to outsource certain events to non-ACPI
 551                  *      drivers via the device manager (device.c).
 552                  */
 553                 break;
 554
 555         case ACPI_NOTIFY_DEVICE_WAKE:
 556                 /* TBD */
 557                 break;
 558
 559         case ACPI_NOTIFY_EJECT_REQUEST:
 560                 /* TBD */
 561                 break;
 562
 563         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 564                 /* TBD: Exactly what does 'light' mean? */
 565                 break;
 566
 567         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 568                 /* TBD */
 569                 break;
 570
 571         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 572                 /* TBD */
 573                 break;
 574
 575         case ACPI_NOTIFY_POWER_FAULT:
 576                 /* TBD */
 577                 break;
 578
 579         default:
 580                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 581                                   "Received unknown/unsupported notification [%08x]\n",
 582                                   type));
 583                 break;
 584         }
 585
 586         driver = device->driver;
 587         if (driver && driver->ops.notify &&
 588             (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 589                 driver->ops.notify(device, type);
 590 }
 591
 592 /* --------------------------------------------------------------------------
 593                              Initialization/Cleanup
 594    -------------------------------------------------------------------------- */
 595
 596 static int __init acpi_bus_init_irq(void)
 597 {
 598         acpi_status status = AE_OK;
 599         union acpi_object arg = { ACPI_TYPE_INTEGER };
 600         struct acpi_object_list arg_list = { 1, &arg };
 601         char *message = NULL;
 602
 603
 604         /*
 605          * Let the system know what interrupt model we are using by
 606          * evaluating the \_PIC object, if exists.
 607          */
 608
 609         switch (acpi_irq_model) {
 610         case ACPI_IRQ_MODEL_PIC:
 611                 message = "PIC";
 612                 break;
 613         case ACPI_IRQ_MODEL_IOAPIC:
 614                 message = "IOAPIC";
 615                 break;
 616         case ACPI_IRQ_MODEL_IOSAPIC:
 617                 message = "IOSAPIC";
 618                 break;
 619         case ACPI_IRQ_MODEL_PLATFORM:
 620                 message = "platform specific model";
 621                 break;
 622         default:
 623                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 624                 return -ENODEV;
 625         }
 626
 627         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 628
 629         arg.integer.value = acpi_irq_model;
 630
 631         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 632         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 633                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 634                 return -ENODEV;
 635         }
 636
 637         return 0;
 638 }
 639
 640 u8 acpi_gbl_permanent_mmap;
 641
 642
 643 void __init acpi_early_init(void)
 644 {
 645         acpi_status status = AE_OK;
 646
 647         if (acpi_disabled)
 648                 return;
 649
 650         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 651
 652         /* enable workarounds, unless strict ACPI spec. compliance */
 653         if (!acpi_strict)
 654                 acpi_gbl_enable_interpreter_slack = TRUE;
 655
 656         acpi_gbl_permanent_mmap = 1;
 657
 658         status = acpi_reallocate_root_table();
 659         if (ACPI_FAILURE(status)) {
 660                 printk(KERN_ERR PREFIX
 661                        "Unable to reallocate ACPI tables\n");
 662                 goto error0;
 663         }
 664
 665         status = acpi_initialize_subsystem();
 666         if (ACPI_FAILURE(status)) {
 667                 printk(KERN_ERR PREFIX
 668                        "Unable to initialize the ACPI Interpreter\n");
 669                 goto error0;
 670         }
 671
 672         status = acpi_load_tables();
 673         if (ACPI_FAILURE(status)) {
 674                 printk(KERN_ERR PREFIX
 675                        "Unable to load the System Description Tables\n");
 676                 goto error0;
 677         }
 678
 679 #ifdef CONFIG_X86
 680         if (!acpi_ioapic) {
 681                 /* compatible (0) means level (3) */
 682                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 683                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 684                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 685                 }
 686                 /* Set PIC-mode SCI trigger type */
 687                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 688                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 689         } else {
 690                 /*
 691                  * now that acpi_gbl_FADT is initialized,
 692                  * update it with result from INT_SRC_OVR parsing
 693                  */
 694                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 695         }
 696 #endif
 697
 698         status =
 699             acpi_enable_subsystem(~
 700                                   (ACPI_NO_HARDWARE_INIT |
 701                                    ACPI_NO_ACPI_ENABLE));
 702         if (ACPI_FAILURE(status)) {
 703                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 704                 goto error0;
 705         }
 706
 707         return;
 708
 709       error0:
 710         disable_acpi();
 711         return;
 712 }
 713
 714 static int __init acpi_bus_init(void)
 715 {
 716         int result = 0;
 717         acpi_status status = AE_OK;
 718         extern acpi_status acpi_os_initialize1(void);
 719
 720         acpi_os_initialize1();
 721
 722         status =
 723             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 724         if (ACPI_FAILURE(status)) {
 725                 printk(KERN_ERR PREFIX
 726                        "Unable to start the ACPI Interpreter\n");
 727                 goto error1;
 728         }
 729
 730         /*
 731          * ACPI 2.0 requires the EC driver to be loaded and work before
 732          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 733          * is called).
 734          *
 735          * This is accomplished by looking for the ECDT table, and getting
 736          * the EC parameters out of that.
 737          */
 738         status = acpi_ec_ecdt_probe();
 739         /* Ignore result. Not having an ECDT is not fatal. */
 740
 741         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 742         if (ACPI_FAILURE(status)) {
 743                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 744                 goto error1;
 745         }
 746
 747         /*
 748          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
 749          * is necessary to enable it as early as possible.
 750          */
 751         acpi_boot_ec_enable();
 752
 753         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 754
 755         /* Initialize sleep structures */
 756         acpi_sleep_init();
 757
 758         /*
 759          * Get the system interrupt model and evaluate \_PIC.
 760          */
 761         result = acpi_bus_init_irq();
 762         if (result)
 763                 goto error1;
 764
 765         /*
 766          * Register the for all standard device notifications.
 767          */
 768         status =
 769             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 770                                         &acpi_bus_notify, NULL);
 771         if (ACPI_FAILURE(status)) {
 772                 printk(KERN_ERR PREFIX
 773                        "Unable to register for device notifications\n");
 774                 goto error1;
 775         }
 776
 777         /*
 778          * Create the top ACPI proc directory
 779          */
 780         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 781
 782         return 0;
 783
 784         /* Mimic structured exception handling */
 785       error1:
 786         acpi_terminate();
 787         return -ENODEV;
 788 }
 789
 790 struct kobject *acpi_kobj;
 791
 792 static int __init acpi_init(void)
 793 {
 794         int result = 0;
 795
 796
 797         if (acpi_disabled) {
 798                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 799                 return -ENODEV;
 800         }
 801
 802         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
 803         if (!acpi_kobj) {
 804                 printk(KERN_WARNING "%s: kset create error\n", __func__);
 805                 acpi_kobj = NULL;
 806         }
 807
 808         init_acpi_device_notify();
 809         result = acpi_bus_init();
 810
 811         if (!result) {
 812                 pci_mmcfg_late_init();
 813                 if (!(pm_flags & PM_APM))
 814                         pm_flags |= PM_ACPI;
 815                 else {
 816                         printk(KERN_INFO PREFIX
 817                                "APM is already active, exiting\n");
 818                         disable_acpi();
 819                         result = -ENODEV;
 820                 }
 821         } else
 822                 disable_acpi();
 823
 824         if (acpi_disabled)
 825                 return result;
 826
 827         /*
 828          * If the laptop falls into the DMI check table, the power state check
 829          * will be disabled in the course of device power transistion.
 830          */
 831         dmi_check_system(power_nocheck_dmi_table);
 832
 833         acpi_scan_init();
 834         acpi_ec_init();
 835         acpi_power_init();
 836         acpi_system_init();
 837         acpi_debug_init();
 838         acpi_sleep_proc_init();
 839         acpi_wakeup_device_init();
 840         return result;
 841 }
 842
 843 subsys_initcall(acpi_init);