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 int acpi_bus_check_device(struct acpi_device *device)
 454 {
 455         acpi_status status = 0;
 456         struct acpi_device_status old_status;
 457
 458
 459         if (!device)
 460                 return -EINVAL;
 461
 462         old_status = device->status;
 463
 464         /*
 465          * Make sure this device's parent is present before we go about
 466          * messing with the device.
 467          */
 468         if (device->parent && !device->parent->status.present) {
 469                 device->status = device->parent->status;
 470                 return 0;
 471         }
 472
 473         status = acpi_bus_get_status(device);
 474         if (ACPI_FAILURE(status))
 475                 return -ENODEV;
 476
 477         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 478                 return 0;
 479
 480         /*
 481          * Device Insertion/Removal
 482          */
 483         if ((device->status.present) && !(old_status.present)) {
 484                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 485                 /* TBD: Handle device insertion */
 486         } else if (!(device->status.present) && (old_status.present)) {
 487                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 488                 /* TBD: Handle device removal */
 489         }
 490
 491         return 0;
 492 }
 493
 494 static int acpi_bus_check_scope(struct acpi_device *device)
 495 {
 496         int result = 0;
 497
 498         if (!device)
 499                 return -EINVAL;
 500
 501         /* Status Change? */
 502         result = acpi_bus_check_device(device);
 503         if (result)
 504                 return result;
 505
 506         /*
 507          * TBD: Enumerate child devices within this device's scope and
 508          *       run acpi_bus_check_device()'s on them.
 509          */
 510
 511         return 0;
 512 }
 513
 514 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 515 int register_acpi_bus_notifier(struct notifier_block *nb)
 516 {
 517         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 518 }
 519 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 520
 521 void unregister_acpi_bus_notifier(struct notifier_block *nb)
 522 {
 523         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 524 }
 525 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 526
 527 /**
 528  * acpi_bus_notify
 529  * ---------------
 530  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 531  */
 532 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 533 {
 534         int result = 0;
 535         struct acpi_device *device = NULL;
 536         struct acpi_driver *driver;
 537
 538         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 539                           type, handle));
 540
 541         blocking_notifier_call_chain(&acpi_bus_notify_list,
 542                 type, (void *)handle);
 543
 544         if (acpi_bus_get_device(handle, &device))
 545                 return;
 546
 547         switch (type) {
 548
 549         case ACPI_NOTIFY_BUS_CHECK:
 550                 result = acpi_bus_check_scope(device);
 551                 /*
 552                  * TBD: We'll need to outsource certain events to non-ACPI
 553                  *      drivers via the device manager (device.c).
 554                  */
 555                 break;
 556
 557         case ACPI_NOTIFY_DEVICE_CHECK:
 558                 result = acpi_bus_check_device(device);
 559                 /*
 560                  * TBD: We'll need to outsource certain events to non-ACPI
 561                  *      drivers via the device manager (device.c).
 562                  */
 563                 break;
 564
 565         case ACPI_NOTIFY_DEVICE_WAKE:
 566                 /* TBD */
 567                 break;
 568
 569         case ACPI_NOTIFY_EJECT_REQUEST:
 570                 /* TBD */
 571                 break;
 572
 573         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 574                 /* TBD: Exactly what does 'light' mean? */
 575                 break;
 576
 577         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 578                 /* TBD */
 579                 break;
 580
 581         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 582                 /* TBD */
 583                 break;
 584
 585         case ACPI_NOTIFY_POWER_FAULT:
 586                 /* TBD */
 587                 break;
 588
 589         default:
 590                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 591                                   "Received unknown/unsupported notification [%08x]\n",
 592                                   type));
 593                 break;
 594         }
 595
 596         driver = device->driver;
 597         if (driver && driver->ops.notify &&
 598             (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 599                 driver->ops.notify(device, type);
 600 }
 601
 602 /* --------------------------------------------------------------------------
 603                              Initialization/Cleanup
 604    -------------------------------------------------------------------------- */
 605
 606 static int __init acpi_bus_init_irq(void)
 607 {
 608         acpi_status status = AE_OK;
 609         union acpi_object arg = { ACPI_TYPE_INTEGER };
 610         struct acpi_object_list arg_list = { 1, &arg };
 611         char *message = NULL;
 612
 613
 614         /*
 615          * Let the system know what interrupt model we are using by
 616          * evaluating the \_PIC object, if exists.
 617          */
 618
 619         switch (acpi_irq_model) {
 620         case ACPI_IRQ_MODEL_PIC:
 621                 message = "PIC";
 622                 break;
 623         case ACPI_IRQ_MODEL_IOAPIC:
 624                 message = "IOAPIC";
 625                 break;
 626         case ACPI_IRQ_MODEL_IOSAPIC:
 627                 message = "IOSAPIC";
 628                 break;
 629         case ACPI_IRQ_MODEL_PLATFORM:
 630                 message = "platform specific model";
 631                 break;
 632         default:
 633                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 634                 return -ENODEV;
 635         }
 636
 637         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 638
 639         arg.integer.value = acpi_irq_model;
 640
 641         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 642         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 643                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 644                 return -ENODEV;
 645         }
 646
 647         return 0;
 648 }
 649
 650 u8 acpi_gbl_permanent_mmap;
 651
 652
 653 void __init acpi_early_init(void)
 654 {
 655         acpi_status status = AE_OK;
 656
 657         if (acpi_disabled)
 658                 return;
 659
 660         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 661
 662         /* enable workarounds, unless strict ACPI spec. compliance */
 663         if (!acpi_strict)
 664                 acpi_gbl_enable_interpreter_slack = TRUE;
 665
 666         acpi_gbl_permanent_mmap = 1;
 667
 668         status = acpi_reallocate_root_table();
 669         if (ACPI_FAILURE(status)) {
 670                 printk(KERN_ERR PREFIX
 671                        "Unable to reallocate ACPI tables\n");
 672                 goto error0;
 673         }
 674
 675         status = acpi_initialize_subsystem();
 676         if (ACPI_FAILURE(status)) {
 677                 printk(KERN_ERR PREFIX
 678                        "Unable to initialize the ACPI Interpreter\n");
 679                 goto error0;
 680         }
 681
 682         status = acpi_load_tables();
 683         if (ACPI_FAILURE(status)) {
 684                 printk(KERN_ERR PREFIX
 685                        "Unable to load the System Description Tables\n");
 686                 goto error0;
 687         }
 688
 689 #ifdef CONFIG_X86
 690         if (!acpi_ioapic) {
 691                 /* compatible (0) means level (3) */
 692                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 693                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 694                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 695                 }
 696                 /* Set PIC-mode SCI trigger type */
 697                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 698                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 699         } else {
 700                 /*
 701                  * now that acpi_gbl_FADT is initialized,
 702                  * update it with result from INT_SRC_OVR parsing
 703                  */
 704                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 705         }
 706 #endif
 707
 708         status =
 709             acpi_enable_subsystem(~
 710                                   (ACPI_NO_HARDWARE_INIT |
 711                                    ACPI_NO_ACPI_ENABLE));
 712         if (ACPI_FAILURE(status)) {
 713                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 714                 goto error0;
 715         }
 716
 717         return;
 718
 719       error0:
 720         disable_acpi();
 721         return;
 722 }
 723
 724 static int __init acpi_bus_init(void)
 725 {
 726         int result = 0;
 727         acpi_status status = AE_OK;
 728         extern acpi_status acpi_os_initialize1(void);
 729
 730         acpi_os_initialize1();
 731
 732         status =
 733             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 734         if (ACPI_FAILURE(status)) {
 735                 printk(KERN_ERR PREFIX
 736                        "Unable to start the ACPI Interpreter\n");
 737                 goto error1;
 738         }
 739
 740         /*
 741          * ACPI 2.0 requires the EC driver to be loaded and work before
 742          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 743          * is called).
 744          *
 745          * This is accomplished by looking for the ECDT table, and getting
 746          * the EC parameters out of that.
 747          */
 748         status = acpi_ec_ecdt_probe();
 749         /* Ignore result. Not having an ECDT is not fatal. */
 750
 751         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 752         if (ACPI_FAILURE(status)) {
 753                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 754                 goto error1;
 755         }
 756
 757         /*
 758          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
 759          * is necessary to enable it as early as possible.
 760          */
 761         acpi_boot_ec_enable();
 762
 763         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 764
 765         /* Initialize sleep structures */
 766         acpi_sleep_init();
 767
 768         /*
 769          * Get the system interrupt model and evaluate \_PIC.
 770          */
 771         result = acpi_bus_init_irq();
 772         if (result)
 773                 goto error1;
 774
 775         /*
 776          * Register the for all standard device notifications.
 777          */
 778         status =
 779             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 780                                         &acpi_bus_notify, NULL);
 781         if (ACPI_FAILURE(status)) {
 782                 printk(KERN_ERR PREFIX
 783                        "Unable to register for device notifications\n");
 784                 goto error1;
 785         }
 786
 787         /*
 788          * Create the top ACPI proc directory
 789          */
 790         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 791
 792         return 0;
 793
 794         /* Mimic structured exception handling */
 795       error1:
 796         acpi_terminate();
 797         return -ENODEV;
 798 }
 799
 800 struct kobject *acpi_kobj;
 801
 802 static int __init acpi_init(void)
 803 {
 804         int result = 0;
 805
 806
 807         if (acpi_disabled) {
 808                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 809                 return -ENODEV;
 810         }
 811
 812         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
 813         if (!acpi_kobj) {
 814                 printk(KERN_WARNING "%s: kset create error\n", __func__);
 815                 acpi_kobj = NULL;
 816         }
 817
 818         init_acpi_device_notify();
 819         result = acpi_bus_init();
 820
 821         if (!result) {
 822                 pci_mmcfg_late_init();
 823                 if (!(pm_flags & PM_APM))
 824                         pm_flags |= PM_ACPI;
 825                 else {
 826                         printk(KERN_INFO PREFIX
 827                                "APM is already active, exiting\n");
 828                         disable_acpi();
 829                         result = -ENODEV;
 830                 }
 831         } else
 832                 disable_acpi();
 833
 834         if (acpi_disabled)
 835                 return result;
 836
 837         /*
 838          * If the laptop falls into the DMI check table, the power state check
 839          * will be disabled in the course of device power transistion.
 840          */
 841         dmi_check_system(power_nocheck_dmi_table);
 842
 843         acpi_scan_init();
 844         acpi_ec_init();
 845         acpi_power_init();
 846         acpi_system_init();
 847         acpi_debug_init();
 848         acpi_sleep_proc_init();
 849         acpi_wakeup_device_init();
 850         return result;
 851 }
 852
 853 subsys_initcall(acpi_init);