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