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 #define _COMPONENT              ACPI_BUS_COMPONENT
  43 ACPI_MODULE_NAME("bus");
  44
  45 struct acpi_device *acpi_root;
  46 struct proc_dir_entry *acpi_root_dir;
  47 EXPORT_SYMBOL(acpi_root_dir);
  48
  49 #define STRUCT_TO_INT(s)        (*((int*)&s))
  50
  51 /* --------------------------------------------------------------------------
  52                                 Device Management
  53    -------------------------------------------------------------------------- */
  54
  55 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
  56 {
  57         acpi_status status = AE_OK;
  58
  59
  60         if (!device)
  61                 return -EINVAL;
  62
  63         /* TBD: Support fixed-feature devices */
  64
  65         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
  66         if (ACPI_FAILURE(status) || !*device) {
  67                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
  68                                   handle));
  69                 return -ENODEV;
  70         }
  71
  72         return 0;
  73 }
  74
  75 EXPORT_SYMBOL(acpi_bus_get_device);
  76
  77 int acpi_bus_get_status(struct acpi_device *device)
  78 {
  79         acpi_status status = AE_OK;
  80         unsigned long sta = 0;
  81
  82
  83         if (!device)
  84                 return -EINVAL;
  85
  86         /*
  87          * Evaluate _STA if present.
  88          */
  89         if (device->flags.dynamic_status) {
  90                 status =
  91                     acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
  92                 if (ACPI_FAILURE(status))
  93                         return -ENODEV;
  94                 STRUCT_TO_INT(device->status) = (int)sta;
  95         }
  96
  97         /*
  98          * Otherwise we assume the status of our parent (unless we don't
  99          * have one, in which case status is implied).
 100          */
 101         else if (device->parent)
 102                 device->status = device->parent->status;
 103         else
 104                 STRUCT_TO_INT(device->status) =
 105                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 106                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 107
 108         if (device->status.functional && !device->status.present) {
 109                 printk(KERN_WARNING PREFIX "Device [%s] status [%08x]: "
 110                        "functional but not present; setting present\n",
 111                        device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status));
 112                 device->status.present = 1;
 113         }
 114
 115         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 116                           device->pnp.bus_id,
 117                           (u32) STRUCT_TO_INT(device->status)));
 118
 119         return 0;
 120 }
 121
 122 EXPORT_SYMBOL(acpi_bus_get_status);
 123
 124 void acpi_bus_private_data_handler(acpi_handle handle,
 125                                    u32 function, void *context)
 126 {
 127         return;
 128 }
 129 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 130
 131 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 132 {
 133         acpi_status status = AE_OK;
 134
 135         if (!*data)
 136                 return -EINVAL;
 137
 138         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 139         if (ACPI_FAILURE(status) || !*data) {
 140                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 141                                 handle));
 142                 return -ENODEV;
 143         }
 144
 145         return 0;
 146 }
 147 EXPORT_SYMBOL(acpi_bus_get_private_data);
 148
 149 /* --------------------------------------------------------------------------
 150                                  Power Management
 151    -------------------------------------------------------------------------- */
 152
 153 int acpi_bus_get_power(acpi_handle handle, int *state)
 154 {
 155         int result = 0;
 156         acpi_status status = 0;
 157         struct acpi_device *device = NULL;
 158         unsigned long psc = 0;
 159
 160
 161         result = acpi_bus_get_device(handle, &device);
 162         if (result)
 163                 return result;
 164
 165         *state = ACPI_STATE_UNKNOWN;
 166
 167         if (!device->flags.power_manageable) {
 168                 /* TBD: Non-recursive algorithm for walking up hierarchy */
 169                 if (device->parent)
 170                         *state = device->parent->power.state;
 171                 else
 172                         *state = ACPI_STATE_D0;
 173         } else {
 174                 /*
 175                  * Get the device's power state either directly (via _PSC) or
 176                  * indirectly (via power resources).
 177                  */
 178                 if (device->power.flags.explicit_get) {
 179                         status = acpi_evaluate_integer(device->handle, "_PSC",
 180                                                        NULL, &psc);
 181                         if (ACPI_FAILURE(status))
 182                                 return -ENODEV;
 183                         device->power.state = (int)psc;
 184                 } else if (device->power.flags.power_resources) {
 185                         result = acpi_power_get_inferred_state(device);
 186                         if (result)
 187                                 return result;
 188                 }
 189
 190                 *state = device->power.state;
 191         }
 192
 193         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
 194                           device->pnp.bus_id, device->power.state));
 195
 196         return 0;
 197 }
 198
 199 EXPORT_SYMBOL(acpi_bus_get_power);
 200
 201 int acpi_bus_set_power(acpi_handle handle, int state)
 202 {
 203         int result = 0;
 204         acpi_status status = AE_OK;
 205         struct acpi_device *device = NULL;
 206         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 207
 208
 209         result = acpi_bus_get_device(handle, &device);
 210         if (result)
 211                 return result;
 212
 213         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
 214                 return -EINVAL;
 215
 216         /* Make sure this is a valid target state */
 217
 218         if (!device->flags.power_manageable) {
 219                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
 220                                 kobject_name(&device->dev.kobj)));
 221                 return -ENODEV;
 222         }
 223         /*
 224          * Get device's current power state
 225          */
 226         acpi_bus_get_power(device->handle, &device->power.state);
 227         if ((state == device->power.state) && !device->flags.force_power_state) {
 228                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
 229                                   state));
 230                 return 0;
 231         }
 232
 233         if (!device->power.states[state].flags.valid) {
 234                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
 235                 return -ENODEV;
 236         }
 237         if (device->parent && (state < device->parent->power.state)) {
 238                 printk(KERN_WARNING PREFIX
 239                               "Cannot set device to a higher-powered"
 240                               " state than parent\n");
 241                 return -ENODEV;
 242         }
 243
 244         /*
 245          * Transition Power
 246          * ----------------
 247          * On transitions to a high-powered state we first apply power (via
 248          * power resources) then evalute _PSx.  Conversly for transitions to
 249          * a lower-powered state.
 250          */
 251         if (state < device->power.state) {
 252                 if (device->power.flags.power_resources) {
 253                         result = acpi_power_transition(device, state);
 254                         if (result)
 255                                 goto end;
 256                 }
 257                 if (device->power.states[state].flags.explicit_set) {
 258                         status = acpi_evaluate_object(device->handle,
 259                                                       object_name, NULL, NULL);
 260                         if (ACPI_FAILURE(status)) {
 261                                 result = -ENODEV;
 262                                 goto end;
 263                         }
 264                 }
 265         } else {
 266                 if (device->power.states[state].flags.explicit_set) {
 267                         status = acpi_evaluate_object(device->handle,
 268                                                       object_name, NULL, NULL);
 269                         if (ACPI_FAILURE(status)) {
 270                                 result = -ENODEV;
 271                                 goto end;
 272                         }
 273                 }
 274                 if (device->power.flags.power_resources) {
 275                         result = acpi_power_transition(device, state);
 276                         if (result)
 277                                 goto end;
 278                 }
 279         }
 280
 281       end:
 282         if (result)
 283                 printk(KERN_WARNING PREFIX
 284                               "Transitioning device [%s] to D%d\n",
 285                               device->pnp.bus_id, state);
 286         else {
 287                 device->power.state = state;
 288                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 289                                   "Device [%s] transitioned to D%d\n",
 290                                   device->pnp.bus_id, state));
 291         }
 292
 293         return result;
 294 }
 295
 296 EXPORT_SYMBOL(acpi_bus_set_power);
 297
 298 bool acpi_bus_power_manageable(acpi_handle handle)
 299 {
 300         struct acpi_device *device;
 301         int result;
 302
 303         result = acpi_bus_get_device(handle, &device);
 304         return result ? false : device->flags.power_manageable;
 305 }
 306
 307 EXPORT_SYMBOL(acpi_bus_power_manageable);
 308
 309 bool acpi_bus_can_wakeup(acpi_handle handle)
 310 {
 311         struct acpi_device *device;
 312         int result;
 313
 314         result = acpi_bus_get_device(handle, &device);
 315         return result ? false : device->wakeup.flags.valid;
 316 }
 317
 318 EXPORT_SYMBOL(acpi_bus_can_wakeup);
 319
 320 /* --------------------------------------------------------------------------
 321                                 Event Management
 322    -------------------------------------------------------------------------- */
 323
 324 #ifdef CONFIG_ACPI_PROC_EVENT
 325 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 326
 327 LIST_HEAD(acpi_bus_event_list);
 328 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 329
 330 extern int event_is_open;
 331
 332 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 333 {
 334         struct acpi_bus_event *event;
 335         unsigned long flags = 0;
 336
 337         /* drop event on the floor if no one's listening */
 338         if (!event_is_open)
 339                 return 0;
 340
 341         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 342         if (!event)
 343                 return -ENOMEM;
 344
 345         strcpy(event->device_class, device_class);
 346         strcpy(event->bus_id, bus_id);
 347         event->type = type;
 348         event->data = data;
 349
 350         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 351         list_add_tail(&event->node, &acpi_bus_event_list);
 352         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 353
 354         wake_up_interruptible(&acpi_bus_event_queue);
 355
 356         return 0;
 357
 358 }
 359
 360 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 361
 362 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 363 {
 364         if (!device)
 365                 return -EINVAL;
 366         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 367                                              device->pnp.bus_id, type, data);
 368 }
 369
 370 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 371
 372 int acpi_bus_receive_event(struct acpi_bus_event *event)
 373 {
 374         unsigned long flags = 0;
 375         struct acpi_bus_event *entry = NULL;
 376
 377         DECLARE_WAITQUEUE(wait, current);
 378
 379
 380         if (!event)
 381                 return -EINVAL;
 382
 383         if (list_empty(&acpi_bus_event_list)) {
 384
 385                 set_current_state(TASK_INTERRUPTIBLE);
 386                 add_wait_queue(&acpi_bus_event_queue, &wait);
 387
 388                 if (list_empty(&acpi_bus_event_list))
 389                         schedule();
 390
 391                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 392                 set_current_state(TASK_RUNNING);
 393
 394                 if (signal_pending(current))
 395                         return -ERESTARTSYS;
 396         }
 397
 398         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 399         if (!list_empty(&acpi_bus_event_list)) {
 400                 entry = list_entry(acpi_bus_event_list.next,
 401                                    struct acpi_bus_event, node);
 402                 list_del(&entry->node);
 403         }
 404         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 405
 406         if (!entry)
 407                 return -ENODEV;
 408
 409         memcpy(event, entry, sizeof(struct acpi_bus_event));
 410
 411         kfree(entry);
 412
 413         return 0;
 414 }
 415
 416 #endif  /* CONFIG_ACPI_PROC_EVENT */
 417
 418 /* --------------------------------------------------------------------------
 419                              Notification Handling
 420    -------------------------------------------------------------------------- */
 421
 422 static int
 423 acpi_bus_check_device(struct acpi_device *device, int *status_changed)
 424 {
 425         acpi_status status = 0;
 426         struct acpi_device_status old_status;
 427
 428
 429         if (!device)
 430                 return -EINVAL;
 431
 432         if (status_changed)
 433                 *status_changed = 0;
 434
 435         old_status = device->status;
 436
 437         /*
 438          * Make sure this device's parent is present before we go about
 439          * messing with the device.
 440          */
 441         if (device->parent && !device->parent->status.present) {
 442                 device->status = device->parent->status;
 443                 if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
 444                         if (status_changed)
 445                                 *status_changed = 1;
 446                 }
 447                 return 0;
 448         }
 449
 450         status = acpi_bus_get_status(device);
 451         if (ACPI_FAILURE(status))
 452                 return -ENODEV;
 453
 454         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 455                 return 0;
 456
 457         if (status_changed)
 458                 *status_changed = 1;
 459
 460         /*
 461          * Device Insertion/Removal
 462          */
 463         if ((device->status.present) && !(old_status.present)) {
 464                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 465                 /* TBD: Handle device insertion */
 466         } else if (!(device->status.present) && (old_status.present)) {
 467                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 468                 /* TBD: Handle device removal */
 469         }
 470
 471         return 0;
 472 }
 473
 474 static int acpi_bus_check_scope(struct acpi_device *device)
 475 {
 476         int result = 0;
 477         int status_changed = 0;
 478
 479
 480         if (!device)
 481                 return -EINVAL;
 482
 483         /* Status Change? */
 484         result = acpi_bus_check_device(device, &status_changed);
 485         if (result)
 486                 return result;
 487
 488         if (!status_changed)
 489                 return 0;
 490
 491         /*
 492          * TBD: Enumerate child devices within this device's scope and
 493          *       run acpi_bus_check_device()'s on them.
 494          */
 495
 496         return 0;
 497 }
 498
 499 /**
 500  * acpi_bus_notify
 501  * ---------------
 502  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 503  */
 504 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 505 {
 506         int result = 0;
 507         struct acpi_device *device = NULL;
 508
 509
 510         if (acpi_bus_get_device(handle, &device))
 511                 return;
 512
 513         switch (type) {
 514
 515         case ACPI_NOTIFY_BUS_CHECK:
 516                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 517                                   "Received BUS CHECK notification for device [%s]\n",
 518                                   device->pnp.bus_id));
 519                 result = acpi_bus_check_scope(device);
 520                 /*
 521                  * TBD: We'll need to outsource certain events to non-ACPI
 522                  *      drivers via the device manager (device.c).
 523                  */
 524                 break;
 525
 526         case ACPI_NOTIFY_DEVICE_CHECK:
 527                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 528                                   "Received DEVICE CHECK notification for device [%s]\n",
 529                                   device->pnp.bus_id));
 530                 result = acpi_bus_check_device(device, NULL);
 531                 /*
 532                  * TBD: We'll need to outsource certain events to non-ACPI
 533                  *      drivers via the device manager (device.c).
 534                  */
 535                 break;
 536
 537         case ACPI_NOTIFY_DEVICE_WAKE:
 538                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 539                                   "Received DEVICE WAKE notification for device [%s]\n",
 540                                   device->pnp.bus_id));
 541                 /* TBD */
 542                 break;
 543
 544         case ACPI_NOTIFY_EJECT_REQUEST:
 545                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 546                                   "Received EJECT REQUEST notification for device [%s]\n",
 547                                   device->pnp.bus_id));
 548                 /* TBD */
 549                 break;
 550
 551         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 552                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 553                                   "Received DEVICE CHECK LIGHT notification for device [%s]\n",
 554                                   device->pnp.bus_id));
 555                 /* TBD: Exactly what does 'light' mean? */
 556                 break;
 557
 558         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 559                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 560                                   "Received FREQUENCY MISMATCH notification for device [%s]\n",
 561                                   device->pnp.bus_id));
 562                 /* TBD */
 563                 break;
 564
 565         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 566                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 567                                   "Received BUS MODE MISMATCH notification for device [%s]\n",
 568                                   device->pnp.bus_id));
 569                 /* TBD */
 570                 break;
 571
 572         case ACPI_NOTIFY_POWER_FAULT:
 573                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 574                                   "Received POWER FAULT notification for device [%s]\n",
 575                                   device->pnp.bus_id));
 576                 /* TBD */
 577                 break;
 578
 579         default:
 580                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 581                                   "Received unknown/unsupported notification [%08x]\n",
 582                                   type));
 583                 break;
 584         }
 585
 586         return;
 587 }
 588
 589 /* --------------------------------------------------------------------------
 590                              Initialization/Cleanup
 591    -------------------------------------------------------------------------- */
 592
 593 static int __init acpi_bus_init_irq(void)
 594 {
 595         acpi_status status = AE_OK;
 596         union acpi_object arg = { ACPI_TYPE_INTEGER };
 597         struct acpi_object_list arg_list = { 1, &arg };
 598         char *message = NULL;
 599
 600
 601         /*
 602          * Let the system know what interrupt model we are using by
 603          * evaluating the \_PIC object, if exists.
 604          */
 605
 606         switch (acpi_irq_model) {
 607         case ACPI_IRQ_MODEL_PIC:
 608                 message = "PIC";
 609                 break;
 610         case ACPI_IRQ_MODEL_IOAPIC:
 611                 message = "IOAPIC";
 612                 break;
 613         case ACPI_IRQ_MODEL_IOSAPIC:
 614                 message = "IOSAPIC";
 615                 break;
 616         case ACPI_IRQ_MODEL_PLATFORM:
 617                 message = "platform specific model";
 618                 break;
 619         default:
 620                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 621                 return -ENODEV;
 622         }
 623
 624         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 625
 626         arg.integer.value = acpi_irq_model;
 627
 628         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 629         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 630                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 631                 return -ENODEV;
 632         }
 633
 634         return 0;
 635 }
 636
 637 u8 acpi_gbl_permanent_mmap;
 638
 639
 640 void __init acpi_early_init(void)
 641 {
 642         acpi_status status = AE_OK;
 643
 644         if (acpi_disabled)
 645                 return;
 646
 647         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 648
 649         /* enable workarounds, unless strict ACPI spec. compliance */
 650         if (!acpi_strict)
 651                 acpi_gbl_enable_interpreter_slack = TRUE;
 652
 653         acpi_gbl_permanent_mmap = 1;
 654
 655         status = acpi_reallocate_root_table();
 656         if (ACPI_FAILURE(status)) {
 657                 printk(KERN_ERR PREFIX
 658                        "Unable to reallocate ACPI tables\n");
 659                 goto error0;
 660         }
 661
 662         status = acpi_initialize_subsystem();
 663         if (ACPI_FAILURE(status)) {
 664                 printk(KERN_ERR PREFIX
 665                        "Unable to initialize the ACPI Interpreter\n");
 666                 goto error0;
 667         }
 668
 669         status = acpi_load_tables();
 670         if (ACPI_FAILURE(status)) {
 671                 printk(KERN_ERR PREFIX
 672                        "Unable to load the System Description Tables\n");
 673                 goto error0;
 674         }
 675
 676 #ifdef CONFIG_X86
 677         if (!acpi_ioapic) {
 678                 /* compatible (0) means level (3) */
 679                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 680                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 681                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 682                 }
 683                 /* Set PIC-mode SCI trigger type */
 684                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 685                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 686         } else {
 687                 /*
 688                  * now that acpi_gbl_FADT is initialized,
 689                  * update it with result from INT_SRC_OVR parsing
 690                  */
 691                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 692         }
 693 #endif
 694
 695         status =
 696             acpi_enable_subsystem(~
 697                                   (ACPI_NO_HARDWARE_INIT |
 698                                    ACPI_NO_ACPI_ENABLE));
 699         if (ACPI_FAILURE(status)) {
 700                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 701                 goto error0;
 702         }
 703
 704         return;
 705
 706       error0:
 707         disable_acpi();
 708         return;
 709 }
 710
 711 static int __init acpi_bus_init(void)
 712 {
 713         int result = 0;
 714         acpi_status status = AE_OK;
 715         extern acpi_status acpi_os_initialize1(void);
 716
 717
 718         status = acpi_os_initialize1();
 719
 720         status =
 721             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 722         if (ACPI_FAILURE(status)) {
 723                 printk(KERN_ERR PREFIX
 724                        "Unable to start the ACPI Interpreter\n");
 725                 goto error1;
 726         }
 727
 728         if (ACPI_FAILURE(status)) {
 729                 printk(KERN_ERR PREFIX
 730                        "Unable to initialize ACPI OS objects\n");
 731                 goto error1;
 732         }
 733 #ifdef CONFIG_ACPI_EC
 734         /*
 735          * ACPI 2.0 requires the EC driver to be loaded and work before
 736          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 737          * is called).
 738          *
 739          * This is accomplished by looking for the ECDT table, and getting
 740          * the EC parameters out of that.
 741          */
 742         status = acpi_ec_ecdt_probe();
 743         /* Ignore result. Not having an ECDT is not fatal. */
 744 #endif
 745
 746         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 747         if (ACPI_FAILURE(status)) {
 748                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 749                 goto error1;
 750         }
 751
 752         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 753
 754         /* Initialize sleep structures */
 755         acpi_sleep_init();
 756
 757         /*
 758          * Get the system interrupt model and evaluate \_PIC.
 759          */
 760         result = acpi_bus_init_irq();
 761         if (result)
 762                 goto error1;
 763
 764         /*
 765          * Register the for all standard device notifications.
 766          */
 767         status =
 768             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 769                                         &acpi_bus_notify, NULL);
 770         if (ACPI_FAILURE(status)) {
 771                 printk(KERN_ERR PREFIX
 772                        "Unable to register for device notifications\n");
 773                 goto error1;
 774         }
 775
 776         /*
 777          * Create the top ACPI proc directory
 778          */
 779         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 780
 781         return 0;
 782
 783         /* Mimic structured exception handling */
 784       error1:
 785         acpi_terminate();
 786         return -ENODEV;
 787 }
 788
 789 struct kobject *acpi_kobj;
 790
 791 static int __init acpi_init(void)
 792 {
 793         int result = 0;
 794
 795
 796         if (acpi_disabled) {
 797                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 798                 return -ENODEV;
 799         }
 800
 801         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
 802         if (!acpi_kobj) {
 803                 printk(KERN_WARNING "%s: kset create error\n", __func__);
 804                 acpi_kobj = NULL;
 805         }
 806
 807         result = acpi_bus_init();
 808
 809         if (!result) {
 810                 pci_mmcfg_late_init();
 811                 if (!(pm_flags & PM_APM))
 812                         pm_flags |= PM_ACPI;
 813                 else {
 814                         printk(KERN_INFO PREFIX
 815                                "APM is already active, exiting\n");
 816                         disable_acpi();
 817                         result = -ENODEV;
 818                 }
 819         } else
 820                 disable_acpi();
 821
 822         return result;
 823 }
 824
 825 subsys_initcall(acpi_init);