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 #include <linux/dmi.h>
  42
  43 #include "internal.h"
  44
  45 #define _COMPONENT              ACPI_BUS_COMPONENT
  46 ACPI_MODULE_NAME("bus");
  47
  48 struct acpi_device *acpi_root;
  49 struct proc_dir_entry *acpi_root_dir;
  50 EXPORT_SYMBOL(acpi_root_dir);
  51
  52 #define STRUCT_TO_INT(s)        (*((int*)&s))
  53
  54 static int set_power_nocheck(const struct dmi_system_id *id)
  55 {
  56         printk(KERN_NOTICE PREFIX "%s detected - "
  57                 "disable power check in power transistion\n", id->ident);
  58         acpi_power_nocheck = 1;
  59         return 0;
  60 }
  61 static struct dmi_system_id __cpuinitdata power_nocheck_dmi_table[] = {
  62         {
  63         set_power_nocheck, "HP Pavilion 05", {
  64         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
  65         DMI_MATCH(DMI_SYS_VENDOR, "HP Pavilion 05"),
  66         DMI_MATCH(DMI_PRODUCT_VERSION, "2001211RE101GLEND") }, NULL},
  67         {},
  68 };
  69
  70
  71 /* --------------------------------------------------------------------------
  72                                 Device Management
  73    -------------------------------------------------------------------------- */
  74
  75 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
  76 {
  77         acpi_status status = AE_OK;
  78
  79
  80         if (!device)
  81                 return -EINVAL;
  82
  83         /* TBD: Support fixed-feature devices */
  84
  85         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
  86         if (ACPI_FAILURE(status) || !*device) {
  87                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
  88                                   handle));
  89                 return -ENODEV;
  90         }
  91
  92         return 0;
  93 }
  94
  95 EXPORT_SYMBOL(acpi_bus_get_device);
  96
  97 int acpi_bus_get_status(struct acpi_device *device)
  98 {
  99         acpi_status status = AE_OK;
 100         unsigned long long sta = 0;
 101
 102
 103         if (!device)
 104                 return -EINVAL;
 105
 106         /*
 107          * Evaluate _STA if present.
 108          */
 109         if (device->flags.dynamic_status) {
 110                 status =
 111                     acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
 112                 if (ACPI_FAILURE(status))
 113                         return -ENODEV;
 114                 STRUCT_TO_INT(device->status) = (int)sta;
 115         }
 116
 117         /*
 118          * According to ACPI spec some device can be present and functional
 119          * even if the parent is not present but functional.
 120          * In such conditions the child device should not inherit the status
 121          * from the parent.
 122          */
 123         else
 124                 STRUCT_TO_INT(device->status) =
 125                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 126                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 127
 128         if (device->status.functional && !device->status.present) {
 129                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 130                        "functional but not present;\n",
 131                         device->pnp.bus_id,
 132                         (u32) STRUCT_TO_INT(device->status)));
 133         }
 134
 135         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 136                           device->pnp.bus_id,
 137                           (u32) STRUCT_TO_INT(device->status)));
 138
 139         return 0;
 140 }
 141
 142 EXPORT_SYMBOL(acpi_bus_get_status);
 143
 144 void acpi_bus_private_data_handler(acpi_handle handle,
 145                                    void *context)
 146 {
 147         return;
 148 }
 149 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 150
 151 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 152 {
 153         acpi_status status = AE_OK;
 154
 155         if (!*data)
 156                 return -EINVAL;
 157
 158         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 159         if (ACPI_FAILURE(status) || !*data) {
 160                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 161                                 handle));
 162                 return -ENODEV;
 163         }
 164
 165         return 0;
 166 }
 167 EXPORT_SYMBOL(acpi_bus_get_private_data);
 168
 169 /* --------------------------------------------------------------------------
 170                                  Power Management
 171    -------------------------------------------------------------------------- */
 172
 173 int acpi_bus_get_power(acpi_handle handle, int *state)
 174 {
 175         int result = 0;
 176         acpi_status status = 0;
 177         struct acpi_device *device = NULL;
 178         unsigned long long psc = 0;
 179
 180
 181         result = acpi_bus_get_device(handle, &device);
 182         if (result)
 183                 return result;
 184
 185         *state = ACPI_STATE_UNKNOWN;
 186
 187         if (!device->flags.power_manageable) {
 188                 /* TBD: Non-recursive algorithm for walking up hierarchy */
 189                 if (device->parent)
 190                         *state = device->parent->power.state;
 191                 else
 192                         *state = ACPI_STATE_D0;
 193         } else {
 194                 /*
 195                  * Get the device's power state either directly (via _PSC) or
 196                  * indirectly (via power resources).
 197                  */
 198                 if (device->power.flags.explicit_get) {
 199                         status = acpi_evaluate_integer(device->handle, "_PSC",
 200                                                        NULL, &psc);
 201                         if (ACPI_FAILURE(status))
 202                                 return -ENODEV;
 203                         device->power.state = (int)psc;
 204                 } else if (device->power.flags.power_resources) {
 205                         result = acpi_power_get_inferred_state(device);
 206                         if (result)
 207                                 return result;
 208                 }
 209
 210                 *state = device->power.state;
 211         }
 212
 213         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
 214                           device->pnp.bus_id, device->power.state));
 215
 216         return 0;
 217 }
 218
 219 EXPORT_SYMBOL(acpi_bus_get_power);
 220
 221 int acpi_bus_set_power(acpi_handle handle, int state)
 222 {
 223         int result = 0;
 224         acpi_status status = AE_OK;
 225         struct acpi_device *device = NULL;
 226         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 227
 228
 229         result = acpi_bus_get_device(handle, &device);
 230         if (result)
 231                 return result;
 232
 233         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
 234                 return -EINVAL;
 235
 236         /* Make sure this is a valid target state */
 237
 238         if (!device->flags.power_manageable) {
 239                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
 240                                 kobject_name(&device->dev.kobj)));
 241                 return -ENODEV;
 242         }
 243         /*
 244          * Get device's current power state
 245          */
 246         if (!acpi_power_nocheck) {
 247                 /*
 248                  * Maybe the incorrect power state is returned on the bogus
 249                  * bios, which is different with the real power state.
 250                  * For example: the bios returns D0 state and the real power
 251                  * state is D3. OS expects to set the device to D0 state. In
 252                  * such case if OS uses the power state returned by the BIOS,
 253                  * the device can't be transisted to the correct power state.
 254                  * So if the acpi_power_nocheck is set, it is unnecessary to
 255                  * get the power state by calling acpi_bus_get_power.
 256                  */
 257                 acpi_bus_get_power(device->handle, &device->power.state);
 258         }
 259         if ((state == device->power.state) && !device->flags.force_power_state) {
 260                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
 261                                   state));
 262                 return 0;
 263         }
 264
 265         if (!device->power.states[state].flags.valid) {
 266                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
 267                 return -ENODEV;
 268         }
 269         if (device->parent && (state < device->parent->power.state)) {
 270                 printk(KERN_WARNING PREFIX
 271                               "Cannot set device to a higher-powered"
 272                               " state than parent\n");
 273                 return -ENODEV;
 274         }
 275
 276         /*
 277          * Transition Power
 278          * ----------------
 279          * On transitions to a high-powered state we first apply power (via
 280          * power resources) then evalute _PSx.  Conversly for transitions to
 281          * a lower-powered state.
 282          */
 283         if (state < device->power.state) {
 284                 if (device->power.flags.power_resources) {
 285                         result = acpi_power_transition(device, state);
 286                         if (result)
 287                                 goto end;
 288                 }
 289                 if (device->power.states[state].flags.explicit_set) {
 290                         status = acpi_evaluate_object(device->handle,
 291                                                       object_name, NULL, NULL);
 292                         if (ACPI_FAILURE(status)) {
 293                                 result = -ENODEV;
 294                                 goto end;
 295                         }
 296                 }
 297         } else {
 298                 if (device->power.states[state].flags.explicit_set) {
 299                         status = acpi_evaluate_object(device->handle,
 300                                                       object_name, NULL, NULL);
 301                         if (ACPI_FAILURE(status)) {
 302                                 result = -ENODEV;
 303                                 goto end;
 304                         }
 305                 }
 306                 if (device->power.flags.power_resources) {
 307                         result = acpi_power_transition(device, state);
 308                         if (result)
 309                                 goto end;
 310                 }
 311         }
 312
 313       end:
 314         if (result)
 315                 printk(KERN_WARNING PREFIX
 316                               "Device [%s] failed to transition to D%d\n",
 317                               device->pnp.bus_id, state);
 318         else {
 319                 device->power.state = state;
 320                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 321                                   "Device [%s] transitioned to D%d\n",
 322                                   device->pnp.bus_id, state));
 323         }
 324
 325         return result;
 326 }
 327
 328 EXPORT_SYMBOL(acpi_bus_set_power);
 329
 330 bool acpi_bus_power_manageable(acpi_handle handle)
 331 {
 332         struct acpi_device *device;
 333         int result;
 334
 335         result = acpi_bus_get_device(handle, &device);
 336         return result ? false : device->flags.power_manageable;
 337 }
 338
 339 EXPORT_SYMBOL(acpi_bus_power_manageable);
 340
 341 bool acpi_bus_can_wakeup(acpi_handle handle)
 342 {
 343         struct acpi_device *device;
 344         int result;
 345
 346         result = acpi_bus_get_device(handle, &device);
 347         return result ? false : device->wakeup.flags.valid;
 348 }
 349
 350 EXPORT_SYMBOL(acpi_bus_can_wakeup);
 351
 352 /* --------------------------------------------------------------------------
 353                                 Event Management
 354    -------------------------------------------------------------------------- */
 355
 356 #ifdef CONFIG_ACPI_PROC_EVENT
 357 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 358
 359 LIST_HEAD(acpi_bus_event_list);
 360 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 361
 362 extern int event_is_open;
 363
 364 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 365 {
 366         struct acpi_bus_event *event;
 367         unsigned long flags = 0;
 368
 369         /* drop event on the floor if no one's listening */
 370         if (!event_is_open)
 371                 return 0;
 372
 373         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 374         if (!event)
 375                 return -ENOMEM;
 376
 377         strcpy(event->device_class, device_class);
 378         strcpy(event->bus_id, bus_id);
 379         event->type = type;
 380         event->data = data;
 381
 382         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 383         list_add_tail(&event->node, &acpi_bus_event_list);
 384         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 385
 386         wake_up_interruptible(&acpi_bus_event_queue);
 387
 388         return 0;
 389
 390 }
 391
 392 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 393
 394 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 395 {
 396         if (!device)
 397                 return -EINVAL;
 398         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 399                                              device->pnp.bus_id, type, data);
 400 }
 401
 402 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 403
 404 int acpi_bus_receive_event(struct acpi_bus_event *event)
 405 {
 406         unsigned long flags = 0;
 407         struct acpi_bus_event *entry = NULL;
 408
 409         DECLARE_WAITQUEUE(wait, current);
 410
 411
 412         if (!event)
 413                 return -EINVAL;
 414
 415         if (list_empty(&acpi_bus_event_list)) {
 416
 417                 set_current_state(TASK_INTERRUPTIBLE);
 418                 add_wait_queue(&acpi_bus_event_queue, &wait);
 419
 420                 if (list_empty(&acpi_bus_event_list))
 421                         schedule();
 422
 423                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 424                 set_current_state(TASK_RUNNING);
 425
 426                 if (signal_pending(current))
 427                         return -ERESTARTSYS;
 428         }
 429
 430         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 431         if (!list_empty(&acpi_bus_event_list)) {
 432                 entry = list_entry(acpi_bus_event_list.next,
 433                                    struct acpi_bus_event, node);
 434                 list_del(&entry->node);
 435         }
 436         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 437
 438         if (!entry)
 439                 return -ENODEV;
 440
 441         memcpy(event, entry, sizeof(struct acpi_bus_event));
 442
 443         kfree(entry);
 444
 445         return 0;
 446 }
 447
 448 #endif  /* CONFIG_ACPI_PROC_EVENT */
 449
 450 /* --------------------------------------------------------------------------
 451                              Notification Handling
 452    -------------------------------------------------------------------------- */
 453
 454 static void acpi_bus_check_device(acpi_handle handle)
 455 {
 456         struct acpi_device *device;
 457         acpi_status status;
 458         struct acpi_device_status old_status;
 459
 460         if (acpi_bus_get_device(handle, &device))
 461                 return;
 462         if (!device)
 463                 return;
 464
 465         old_status = device->status;
 466
 467         /*
 468          * Make sure this device's parent is present before we go about
 469          * messing with the device.
 470          */
 471         if (device->parent && !device->parent->status.present) {
 472                 device->status = device->parent->status;
 473                 return;
 474         }
 475
 476         status = acpi_bus_get_status(device);
 477         if (ACPI_FAILURE(status))
 478                 return;
 479
 480         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 481                 return;
 482
 483         /*
 484          * Device Insertion/Removal
 485          */
 486         if ((device->status.present) && !(old_status.present)) {
 487                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 488                 /* TBD: Handle device insertion */
 489         } else if (!(device->status.present) && (old_status.present)) {
 490                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 491                 /* TBD: Handle device removal */
 492         }
 493 }
 494
 495 static void acpi_bus_check_scope(acpi_handle handle)
 496 {
 497         /* Status Change? */
 498         acpi_bus_check_device(handle);
 499
 500         /*
 501          * TBD: Enumerate child devices within this device's scope and
 502          *       run acpi_bus_check_device()'s on them.
 503          */
 504 }
 505
 506 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 507 int register_acpi_bus_notifier(struct notifier_block *nb)
 508 {
 509         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 510 }
 511 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 512
 513 void unregister_acpi_bus_notifier(struct notifier_block *nb)
 514 {
 515         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 516 }
 517 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 518
 519 /**
 520  * acpi_bus_notify
 521  * ---------------
 522  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 523  */
 524 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 525 {
 526         struct acpi_device *device = NULL;
 527         struct acpi_driver *driver;
 528
 529         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 530                           type, handle));
 531
 532         blocking_notifier_call_chain(&acpi_bus_notify_list,
 533                 type, (void *)handle);
 534
 535         switch (type) {
 536
 537         case ACPI_NOTIFY_BUS_CHECK:
 538                 acpi_bus_check_scope(handle);
 539                 /*
 540                  * TBD: We'll need to outsource certain events to non-ACPI
 541                  *      drivers via the device manager (device.c).
 542                  */
 543                 break;
 544
 545         case ACPI_NOTIFY_DEVICE_CHECK:
 546                 acpi_bus_check_device(handle);
 547                 /*
 548                  * TBD: We'll need to outsource certain events to non-ACPI
 549                  *      drivers via the device manager (device.c).
 550                  */
 551                 break;
 552
 553         case ACPI_NOTIFY_DEVICE_WAKE:
 554                 /* TBD */
 555                 break;
 556
 557         case ACPI_NOTIFY_EJECT_REQUEST:
 558                 /* TBD */
 559                 break;
 560
 561         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 562                 /* TBD: Exactly what does 'light' mean? */
 563                 break;
 564
 565         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 566                 /* TBD */
 567                 break;
 568
 569         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 570                 /* TBD */
 571                 break;
 572
 573         case ACPI_NOTIFY_POWER_FAULT:
 574                 /* TBD */
 575                 break;
 576
 577         default:
 578                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 579                                   "Received unknown/unsupported notification [%08x]\n",
 580                                   type));
 581                 break;
 582         }
 583
 584         acpi_bus_get_device(handle, &device);
 585         if (device) {
 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 /* --------------------------------------------------------------------------
 594                              Initialization/Cleanup
 595    -------------------------------------------------------------------------- */
 596
 597 static int __init acpi_bus_init_irq(void)
 598 {
 599         acpi_status status = AE_OK;
 600         union acpi_object arg = { ACPI_TYPE_INTEGER };
 601         struct acpi_object_list arg_list = { 1, &arg };
 602         char *message = NULL;
 603
 604
 605         /*
 606          * Let the system know what interrupt model we are using by
 607          * evaluating the \_PIC object, if exists.
 608          */
 609
 610         switch (acpi_irq_model) {
 611         case ACPI_IRQ_MODEL_PIC:
 612                 message = "PIC";
 613                 break;
 614         case ACPI_IRQ_MODEL_IOAPIC:
 615                 message = "IOAPIC";
 616                 break;
 617         case ACPI_IRQ_MODEL_IOSAPIC:
 618                 message = "IOSAPIC";
 619                 break;
 620         case ACPI_IRQ_MODEL_PLATFORM:
 621                 message = "platform specific model";
 622                 break;
 623         default:
 624                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 625                 return -ENODEV;
 626         }
 627
 628         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 629
 630         arg.integer.value = acpi_irq_model;
 631
 632         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 633         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 634                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 635                 return -ENODEV;
 636         }
 637
 638         return 0;
 639 }
 640
 641 u8 acpi_gbl_permanent_mmap;
 642
 643
 644 void __init acpi_early_init(void)
 645 {
 646         acpi_status status = AE_OK;
 647
 648         if (acpi_disabled)
 649                 return;
 650
 651         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 652
 653         /* enable workarounds, unless strict ACPI spec. compliance */
 654         if (!acpi_strict)
 655                 acpi_gbl_enable_interpreter_slack = TRUE;
 656
 657         acpi_gbl_permanent_mmap = 1;
 658
 659         status = acpi_reallocate_root_table();
 660         if (ACPI_FAILURE(status)) {
 661                 printk(KERN_ERR PREFIX
 662                        "Unable to reallocate ACPI tables\n");
 663                 goto error0;
 664         }
 665
 666         status = acpi_initialize_subsystem();
 667         if (ACPI_FAILURE(status)) {
 668                 printk(KERN_ERR PREFIX
 669                        "Unable to initialize the ACPI Interpreter\n");
 670                 goto error0;
 671         }
 672
 673         status = acpi_load_tables();
 674         if (ACPI_FAILURE(status)) {
 675                 printk(KERN_ERR PREFIX
 676                        "Unable to load the System Description Tables\n");
 677                 goto error0;
 678         }
 679
 680 #ifdef CONFIG_X86
 681         if (!acpi_ioapic) {
 682                 /* compatible (0) means level (3) */
 683                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 684                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 685                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 686                 }
 687                 /* Set PIC-mode SCI trigger type */
 688                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 689                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 690         } else {
 691                 /*
 692                  * now that acpi_gbl_FADT is initialized,
 693                  * update it with result from INT_SRC_OVR parsing
 694                  */
 695                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 696         }
 697 #endif
 698
 699         status =
 700             acpi_enable_subsystem(~
 701                                   (ACPI_NO_HARDWARE_INIT |
 702                                    ACPI_NO_ACPI_ENABLE));
 703         if (ACPI_FAILURE(status)) {
 704                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 705                 goto error0;
 706         }
 707
 708         return;
 709
 710       error0:
 711         disable_acpi();
 712         return;
 713 }
 714
 715 static int __init acpi_bus_init(void)
 716 {
 717         int result = 0;
 718         acpi_status status = AE_OK;
 719         extern acpi_status acpi_os_initialize1(void);
 720
 721         acpi_os_initialize1();
 722
 723         status =
 724             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 725         if (ACPI_FAILURE(status)) {
 726                 printk(KERN_ERR PREFIX
 727                        "Unable to start the ACPI Interpreter\n");
 728                 goto error1;
 729         }
 730
 731         /*
 732          * ACPI 2.0 requires the EC driver to be loaded and work before
 733          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 734          * is called).
 735          *
 736          * This is accomplished by looking for the ECDT table, and getting
 737          * the EC parameters out of that.
 738          */
 739         status = acpi_ec_ecdt_probe();
 740         /* Ignore result. Not having an ECDT is not fatal. */
 741
 742         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 743         if (ACPI_FAILURE(status)) {
 744                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 745                 goto error1;
 746         }
 747
 748         /*
 749          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
 750          * is necessary to enable it as early as possible.
 751          */
 752         acpi_boot_ec_enable();
 753
 754         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 755
 756         /* Initialize sleep structures */
 757         acpi_sleep_init();
 758
 759         /*
 760          * Get the system interrupt model and evaluate \_PIC.
 761          */
 762         result = acpi_bus_init_irq();
 763         if (result)
 764                 goto error1;
 765
 766         /*
 767          * Register the for all standard device notifications.
 768          */
 769         status =
 770             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 771                                         &acpi_bus_notify, NULL);
 772         if (ACPI_FAILURE(status)) {
 773                 printk(KERN_ERR PREFIX
 774                        "Unable to register for device notifications\n");
 775                 goto error1;
 776         }
 777
 778         /*
 779          * Create the top ACPI proc directory
 780          */
 781         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 782
 783         return 0;
 784
 785         /* Mimic structured exception handling */
 786       error1:
 787         acpi_terminate();
 788         return -ENODEV;
 789 }
 790
 791 struct kobject *acpi_kobj;
 792
 793 static int __init acpi_init(void)
 794 {
 795         int result = 0;
 796
 797
 798         if (acpi_disabled) {
 799                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 800                 return -ENODEV;
 801         }
 802
 803         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
 804         if (!acpi_kobj) {
 805                 printk(KERN_WARNING "%s: kset create error\n", __func__);
 806                 acpi_kobj = NULL;
 807         }
 808
 809         init_acpi_device_notify();
 810         result = acpi_bus_init();
 811
 812         if (!result) {
 813                 pci_mmcfg_late_init();
 814                 if (!(pm_flags & PM_APM))
 815                         pm_flags |= PM_ACPI;
 816                 else {
 817                         printk(KERN_INFO PREFIX
 818                                "APM is already active, exiting\n");
 819                         disable_acpi();
 820                         result = -ENODEV;
 821                 }
 822         } else
 823                 disable_acpi();
 824
 825         if (acpi_disabled)
 826                 return result;
 827
 828         /*
 829          * If the laptop falls into the DMI check table, the power state check
 830          * will be disabled in the course of device power transistion.
 831          */
 832         dmi_check_system(power_nocheck_dmi_table);
 833
 834         acpi_scan_init();
 835         acpi_ec_init();
 836         acpi_power_init();
 837         acpi_system_init();
 838         acpi_debug_init();
 839         acpi_sleep_proc_init();
 840         acpi_wakeup_device_init();
 841         return result;
 842 }
 843
 844 subsys_initcall(acpi_init);