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 /* --------------------------------------------------------------------------
 310                                 Event Management
 311    -------------------------------------------------------------------------- */
 312
 313 #ifdef CONFIG_ACPI_PROC_EVENT
 314 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 315
 316 LIST_HEAD(acpi_bus_event_list);
 317 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 318
 319 extern int event_is_open;
 320
 321 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 322 {
 323         struct acpi_bus_event *event;
 324         unsigned long flags = 0;
 325
 326         /* drop event on the floor if no one's listening */
 327         if (!event_is_open)
 328                 return 0;
 329
 330         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 331         if (!event)
 332                 return -ENOMEM;
 333
 334         strcpy(event->device_class, device_class);
 335         strcpy(event->bus_id, bus_id);
 336         event->type = type;
 337         event->data = data;
 338
 339         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 340         list_add_tail(&event->node, &acpi_bus_event_list);
 341         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 342
 343         wake_up_interruptible(&acpi_bus_event_queue);
 344
 345         return 0;
 346
 347 }
 348
 349 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 350
 351 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 352 {
 353         if (!device)
 354                 return -EINVAL;
 355         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 356                                              device->pnp.bus_id, type, data);
 357 }
 358
 359 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 360
 361 int acpi_bus_receive_event(struct acpi_bus_event *event)
 362 {
 363         unsigned long flags = 0;
 364         struct acpi_bus_event *entry = NULL;
 365
 366         DECLARE_WAITQUEUE(wait, current);
 367
 368
 369         if (!event)
 370                 return -EINVAL;
 371
 372         if (list_empty(&acpi_bus_event_list)) {
 373
 374                 set_current_state(TASK_INTERRUPTIBLE);
 375                 add_wait_queue(&acpi_bus_event_queue, &wait);
 376
 377                 if (list_empty(&acpi_bus_event_list))
 378                         schedule();
 379
 380                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 381                 set_current_state(TASK_RUNNING);
 382
 383                 if (signal_pending(current))
 384                         return -ERESTARTSYS;
 385         }
 386
 387         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 388         if (!list_empty(&acpi_bus_event_list)) {
 389                 entry = list_entry(acpi_bus_event_list.next,
 390                                    struct acpi_bus_event, node);
 391                 list_del(&entry->node);
 392         }
 393         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 394
 395         if (!entry)
 396                 return -ENODEV;
 397
 398         memcpy(event, entry, sizeof(struct acpi_bus_event));
 399
 400         kfree(entry);
 401
 402         return 0;
 403 }
 404
 405 #endif  /* CONFIG_ACPI_PROC_EVENT */
 406
 407 /* --------------------------------------------------------------------------
 408                              Notification Handling
 409    -------------------------------------------------------------------------- */
 410
 411 static int
 412 acpi_bus_check_device(struct acpi_device *device, int *status_changed)
 413 {
 414         acpi_status status = 0;
 415         struct acpi_device_status old_status;
 416
 417
 418         if (!device)
 419                 return -EINVAL;
 420
 421         if (status_changed)
 422                 *status_changed = 0;
 423
 424         old_status = device->status;
 425
 426         /*
 427          * Make sure this device's parent is present before we go about
 428          * messing with the device.
 429          */
 430         if (device->parent && !device->parent->status.present) {
 431                 device->status = device->parent->status;
 432                 if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
 433                         if (status_changed)
 434                                 *status_changed = 1;
 435                 }
 436                 return 0;
 437         }
 438
 439         status = acpi_bus_get_status(device);
 440         if (ACPI_FAILURE(status))
 441                 return -ENODEV;
 442
 443         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 444                 return 0;
 445
 446         if (status_changed)
 447                 *status_changed = 1;
 448
 449         /*
 450          * Device Insertion/Removal
 451          */
 452         if ((device->status.present) && !(old_status.present)) {
 453                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 454                 /* TBD: Handle device insertion */
 455         } else if (!(device->status.present) && (old_status.present)) {
 456                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 457                 /* TBD: Handle device removal */
 458         }
 459
 460         return 0;
 461 }
 462
 463 static int acpi_bus_check_scope(struct acpi_device *device)
 464 {
 465         int result = 0;
 466         int status_changed = 0;
 467
 468
 469         if (!device)
 470                 return -EINVAL;
 471
 472         /* Status Change? */
 473         result = acpi_bus_check_device(device, &status_changed);
 474         if (result)
 475                 return result;
 476
 477         if (!status_changed)
 478                 return 0;
 479
 480         /*
 481          * TBD: Enumerate child devices within this device's scope and
 482          *       run acpi_bus_check_device()'s on them.
 483          */
 484
 485         return 0;
 486 }
 487
 488 /**
 489  * acpi_bus_notify
 490  * ---------------
 491  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 492  */
 493 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 494 {
 495         int result = 0;
 496         struct acpi_device *device = NULL;
 497
 498
 499         if (acpi_bus_get_device(handle, &device))
 500                 return;
 501
 502         switch (type) {
 503
 504         case ACPI_NOTIFY_BUS_CHECK:
 505                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 506                                   "Received BUS CHECK notification for device [%s]\n",
 507                                   device->pnp.bus_id));
 508                 result = acpi_bus_check_scope(device);
 509                 /*
 510                  * TBD: We'll need to outsource certain events to non-ACPI
 511                  *      drivers via the device manager (device.c).
 512                  */
 513                 break;
 514
 515         case ACPI_NOTIFY_DEVICE_CHECK:
 516                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 517                                   "Received DEVICE CHECK notification for device [%s]\n",
 518                                   device->pnp.bus_id));
 519                 result = acpi_bus_check_device(device, NULL);
 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_WAKE:
 527                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 528                                   "Received DEVICE WAKE notification for device [%s]\n",
 529                                   device->pnp.bus_id));
 530                 /* TBD */
 531                 break;
 532
 533         case ACPI_NOTIFY_EJECT_REQUEST:
 534                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 535                                   "Received EJECT REQUEST notification for device [%s]\n",
 536                                   device->pnp.bus_id));
 537                 /* TBD */
 538                 break;
 539
 540         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 541                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 542                                   "Received DEVICE CHECK LIGHT notification for device [%s]\n",
 543                                   device->pnp.bus_id));
 544                 /* TBD: Exactly what does 'light' mean? */
 545                 break;
 546
 547         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 548                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 549                                   "Received FREQUENCY MISMATCH notification for device [%s]\n",
 550                                   device->pnp.bus_id));
 551                 /* TBD */
 552                 break;
 553
 554         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 555                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 556                                   "Received BUS MODE MISMATCH notification for device [%s]\n",
 557                                   device->pnp.bus_id));
 558                 /* TBD */
 559                 break;
 560
 561         case ACPI_NOTIFY_POWER_FAULT:
 562                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 563                                   "Received POWER FAULT notification for device [%s]\n",
 564                                   device->pnp.bus_id));
 565                 /* TBD */
 566                 break;
 567
 568         default:
 569                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 570                                   "Received unknown/unsupported notification [%08x]\n",
 571                                   type));
 572                 break;
 573         }
 574
 575         return;
 576 }
 577
 578 /* --------------------------------------------------------------------------
 579                              Initialization/Cleanup
 580    -------------------------------------------------------------------------- */
 581
 582 static int __init acpi_bus_init_irq(void)
 583 {
 584         acpi_status status = AE_OK;
 585         union acpi_object arg = { ACPI_TYPE_INTEGER };
 586         struct acpi_object_list arg_list = { 1, &arg };
 587         char *message = NULL;
 588
 589
 590         /*
 591          * Let the system know what interrupt model we are using by
 592          * evaluating the \_PIC object, if exists.
 593          */
 594
 595         switch (acpi_irq_model) {
 596         case ACPI_IRQ_MODEL_PIC:
 597                 message = "PIC";
 598                 break;
 599         case ACPI_IRQ_MODEL_IOAPIC:
 600                 message = "IOAPIC";
 601                 break;
 602         case ACPI_IRQ_MODEL_IOSAPIC:
 603                 message = "IOSAPIC";
 604                 break;
 605         case ACPI_IRQ_MODEL_PLATFORM:
 606                 message = "platform specific model";
 607                 break;
 608         default:
 609                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 610                 return -ENODEV;
 611         }
 612
 613         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 614
 615         arg.integer.value = acpi_irq_model;
 616
 617         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 618         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 619                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 620                 return -ENODEV;
 621         }
 622
 623         return 0;
 624 }
 625
 626 acpi_native_uint acpi_gbl_permanent_mmap;
 627
 628
 629 void __init acpi_early_init(void)
 630 {
 631         acpi_status status = AE_OK;
 632
 633         if (acpi_disabled)
 634                 return;
 635
 636         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 637
 638         /* enable workarounds, unless strict ACPI spec. compliance */
 639         if (!acpi_strict)
 640                 acpi_gbl_enable_interpreter_slack = TRUE;
 641
 642         acpi_gbl_permanent_mmap = 1;
 643
 644         status = acpi_reallocate_root_table();
 645         if (ACPI_FAILURE(status)) {
 646                 printk(KERN_ERR PREFIX
 647                        "Unable to reallocate ACPI tables\n");
 648                 goto error0;
 649         }
 650
 651         status = acpi_initialize_subsystem();
 652         if (ACPI_FAILURE(status)) {
 653                 printk(KERN_ERR PREFIX
 654                        "Unable to initialize the ACPI Interpreter\n");
 655                 goto error0;
 656         }
 657
 658         status = acpi_load_tables();
 659         if (ACPI_FAILURE(status)) {
 660                 printk(KERN_ERR PREFIX
 661                        "Unable to load the System Description Tables\n");
 662                 goto error0;
 663         }
 664
 665 #ifdef CONFIG_X86
 666         if (!acpi_ioapic) {
 667                 /* compatible (0) means level (3) */
 668                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 669                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 670                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 671                 }
 672                 /* Set PIC-mode SCI trigger type */
 673                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 674                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 675         } else {
 676                 /*
 677                  * now that acpi_gbl_FADT is initialized,
 678                  * update it with result from INT_SRC_OVR parsing
 679                  */
 680                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 681         }
 682 #endif
 683
 684         status =
 685             acpi_enable_subsystem(~
 686                                   (ACPI_NO_HARDWARE_INIT |
 687                                    ACPI_NO_ACPI_ENABLE));
 688         if (ACPI_FAILURE(status)) {
 689                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 690                 goto error0;
 691         }
 692
 693         return;
 694
 695       error0:
 696         disable_acpi();
 697         return;
 698 }
 699
 700 static int __init acpi_bus_init(void)
 701 {
 702         int result = 0;
 703         acpi_status status = AE_OK;
 704         extern acpi_status acpi_os_initialize1(void);
 705
 706
 707         status = acpi_os_initialize1();
 708
 709         status =
 710             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 711         if (ACPI_FAILURE(status)) {
 712                 printk(KERN_ERR PREFIX
 713                        "Unable to start the ACPI Interpreter\n");
 714                 goto error1;
 715         }
 716
 717         if (ACPI_FAILURE(status)) {
 718                 printk(KERN_ERR PREFIX
 719                        "Unable to initialize ACPI OS objects\n");
 720                 goto error1;
 721         }
 722 #ifdef CONFIG_ACPI_EC
 723         /*
 724          * ACPI 2.0 requires the EC driver to be loaded and work before
 725          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 726          * is called).
 727          *
 728          * This is accomplished by looking for the ECDT table, and getting
 729          * the EC parameters out of that.
 730          */
 731         status = acpi_ec_ecdt_probe();
 732         /* Ignore result. Not having an ECDT is not fatal. */
 733 #endif
 734
 735         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 736         if (ACPI_FAILURE(status)) {
 737                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 738                 goto error1;
 739         }
 740
 741         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 742
 743         /* Initialize sleep structures */
 744         acpi_sleep_init();
 745
 746         /*
 747          * Get the system interrupt model and evaluate \_PIC.
 748          */
 749         result = acpi_bus_init_irq();
 750         if (result)
 751                 goto error1;
 752
 753         /*
 754          * Register the for all standard device notifications.
 755          */
 756         status =
 757             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 758                                         &acpi_bus_notify, NULL);
 759         if (ACPI_FAILURE(status)) {
 760                 printk(KERN_ERR PREFIX
 761                        "Unable to register for device notifications\n");
 762                 goto error1;
 763         }
 764
 765         /*
 766          * Create the top ACPI proc directory
 767          */
 768         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 769
 770         return 0;
 771
 772         /* Mimic structured exception handling */
 773       error1:
 774         acpi_terminate();
 775         return -ENODEV;
 776 }
 777
 778 struct kobject *acpi_kobj;
 779
 780 static int __init acpi_init(void)
 781 {
 782         int result = 0;
 783
 784
 785         if (acpi_disabled) {
 786                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 787                 return -ENODEV;
 788         }
 789
 790         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
 791         if (!acpi_kobj) {
 792                 printk(KERN_WARNING "%s: kset create error\n", __func__);
 793                 acpi_kobj = NULL;
 794         }
 795
 796         result = acpi_bus_init();
 797
 798         if (!result) {
 799                 pci_mmcfg_late_init();
 800                 if (!(pm_flags & PM_APM))
 801                         pm_flags |= PM_ACPI;
 802                 else {
 803                         printk(KERN_INFO PREFIX
 804                                "APM is already active, exiting\n");
 805                         disable_acpi();
 806                         result = -ENODEV;
 807                 }
 808         } else
 809                 disable_acpi();
 810
 811         return result;
 812 }
 813
 814 subsys_initcall(acpi_init);