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/pm_legacy.h>
  33 #include <linux/device.h>
  34 #include <linux/proc_fs.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 #ifdef  CONFIG_X86
  45 extern void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger);
  46 #endif
  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 /* --------------------------------------------------------------------------
  55                                 Device Management
  56    -------------------------------------------------------------------------- */
  57
  58 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
  59 {
  60         acpi_status status = AE_OK;
  61
  62
  63         if (!device)
  64                 return -EINVAL;
  65
  66         /* TBD: Support fixed-feature devices */
  67
  68         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
  69         if (ACPI_FAILURE(status) || !*device) {
  70                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
  71                                   handle));
  72                 return -ENODEV;
  73         }
  74
  75         return 0;
  76 }
  77
  78 EXPORT_SYMBOL(acpi_bus_get_device);
  79
  80 int acpi_bus_get_status(struct acpi_device *device)
  81 {
  82         acpi_status status = AE_OK;
  83         unsigned long sta = 0;
  84
  85
  86         if (!device)
  87                 return -EINVAL;
  88
  89         /*
  90          * Evaluate _STA if present.
  91          */
  92         if (device->flags.dynamic_status) {
  93                 status =
  94                     acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
  95                 if (ACPI_FAILURE(status))
  96                         return -ENODEV;
  97                 STRUCT_TO_INT(device->status) = (int)sta;
  98         }
  99
 100         /*
 101          * Otherwise we assume the status of our parent (unless we don't
 102          * have one, in which case status is implied).
 103          */
 104         else if (device->parent)
 105                 device->status = device->parent->status;
 106         else
 107                 STRUCT_TO_INT(device->status) =
 108                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 109                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 110
 111         if (device->status.functional && !device->status.present) {
 112                 printk(KERN_WARNING PREFIX "Device [%s] status [%08x]: "
 113                        "functional but not present; setting present\n",
 114                        device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status));
 115                 device->status.present = 1;
 116         }
 117
 118         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 119                           device->pnp.bus_id,
 120                           (u32) STRUCT_TO_INT(device->status)));
 121
 122         return 0;
 123 }
 124
 125 EXPORT_SYMBOL(acpi_bus_get_status);
 126
 127 /* --------------------------------------------------------------------------
 128                                  Power Management
 129    -------------------------------------------------------------------------- */
 130
 131 int acpi_bus_get_power(acpi_handle handle, int *state)
 132 {
 133         int result = 0;
 134         acpi_status status = 0;
 135         struct acpi_device *device = NULL;
 136         unsigned long psc = 0;
 137
 138
 139         result = acpi_bus_get_device(handle, &device);
 140         if (result)
 141                 return result;
 142
 143         *state = ACPI_STATE_UNKNOWN;
 144
 145         if (!device->flags.power_manageable) {
 146                 /* TBD: Non-recursive algorithm for walking up hierarchy */
 147                 if (device->parent)
 148                         *state = device->parent->power.state;
 149                 else
 150                         *state = ACPI_STATE_D0;
 151         } else {
 152                 /*
 153                  * Get the device's power state either directly (via _PSC) or
 154                  * indirectly (via power resources).
 155                  */
 156                 if (device->power.flags.explicit_get) {
 157                         status = acpi_evaluate_integer(device->handle, "_PSC",
 158                                                        NULL, &psc);
 159                         if (ACPI_FAILURE(status))
 160                                 return -ENODEV;
 161                         device->power.state = (int)psc;
 162                 } else if (device->power.flags.power_resources) {
 163                         result = acpi_power_get_inferred_state(device);
 164                         if (result)
 165                                 return result;
 166                 }
 167
 168                 *state = device->power.state;
 169         }
 170
 171         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
 172                           device->pnp.bus_id, device->power.state));
 173
 174         return 0;
 175 }
 176
 177 EXPORT_SYMBOL(acpi_bus_get_power);
 178
 179 int acpi_bus_set_power(acpi_handle handle, int state)
 180 {
 181         int result = 0;
 182         acpi_status status = AE_OK;
 183         struct acpi_device *device = NULL;
 184         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 185
 186
 187         result = acpi_bus_get_device(handle, &device);
 188         if (result)
 189                 return result;
 190
 191         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
 192                 return -EINVAL;
 193
 194         /* Make sure this is a valid target state */
 195
 196         if (!device->flags.power_manageable) {
 197                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
 198                                 kobject_name(&device->dev.kobj)));
 199                 return -ENODEV;
 200         }
 201         /*
 202          * Get device's current power state
 203          */
 204         acpi_bus_get_power(device->handle, &device->power.state);
 205         if (state == device->power.state) {
 206                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
 207                                   state));
 208                 return 0;
 209         }
 210
 211         if (!device->power.states[state].flags.valid) {
 212                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
 213                 return -ENODEV;
 214         }
 215         if (device->parent && (state < device->parent->power.state)) {
 216                 printk(KERN_WARNING PREFIX
 217                               "Cannot set device to a higher-powered"
 218                               " state than parent\n");
 219                 return -ENODEV;
 220         }
 221
 222         /*
 223          * Transition Power
 224          * ----------------
 225          * On transitions to a high-powered state we first apply power (via
 226          * power resources) then evalute _PSx.  Conversly for transitions to
 227          * a lower-powered state.
 228          */
 229         if (state < device->power.state) {
 230                 if (device->power.flags.power_resources) {
 231                         result = acpi_power_transition(device, state);
 232                         if (result)
 233                                 goto end;
 234                 }
 235                 if (device->power.states[state].flags.explicit_set) {
 236                         status = acpi_evaluate_object(device->handle,
 237                                                       object_name, NULL, NULL);
 238                         if (ACPI_FAILURE(status)) {
 239                                 result = -ENODEV;
 240                                 goto end;
 241                         }
 242                 }
 243         } else {
 244                 if (device->power.states[state].flags.explicit_set) {
 245                         status = acpi_evaluate_object(device->handle,
 246                                                       object_name, NULL, NULL);
 247                         if (ACPI_FAILURE(status)) {
 248                                 result = -ENODEV;
 249                                 goto end;
 250                         }
 251                 }
 252                 if (device->power.flags.power_resources) {
 253                         result = acpi_power_transition(device, state);
 254                         if (result)
 255                                 goto end;
 256                 }
 257         }
 258
 259       end:
 260         if (result)
 261                 printk(KERN_WARNING PREFIX
 262                               "Transitioning device [%s] to D%d\n",
 263                               device->pnp.bus_id, state);
 264         else {
 265                 device->power.state = state;
 266                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 267                                   "Device [%s] transitioned to D%d\n",
 268                                   device->pnp.bus_id, state));
 269         }
 270
 271         return result;
 272 }
 273
 274 EXPORT_SYMBOL(acpi_bus_set_power);
 275
 276 /* --------------------------------------------------------------------------
 277                                 Event Management
 278    -------------------------------------------------------------------------- */
 279
 280 #ifdef CONFIG_ACPI_PROC_EVENT
 281 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 282
 283 LIST_HEAD(acpi_bus_event_list);
 284 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 285
 286 extern int event_is_open;
 287
 288 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 289 {
 290         struct acpi_bus_event *event;
 291         unsigned long flags = 0;
 292
 293         /* drop event on the floor if no one's listening */
 294         if (!event_is_open)
 295                 return 0;
 296
 297         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 298         if (!event)
 299                 return -ENOMEM;
 300
 301         strcpy(event->device_class, device_class);
 302         strcpy(event->bus_id, bus_id);
 303         event->type = type;
 304         event->data = data;
 305
 306         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 307         list_add_tail(&event->node, &acpi_bus_event_list);
 308         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 309
 310         wake_up_interruptible(&acpi_bus_event_queue);
 311
 312         return 0;
 313
 314 }
 315
 316 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 317
 318 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 319 {
 320         if (!device)
 321                 return -EINVAL;
 322         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 323                                              device->pnp.bus_id, type, data);
 324 }
 325
 326 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 327
 328 int acpi_bus_receive_event(struct acpi_bus_event *event)
 329 {
 330         unsigned long flags = 0;
 331         struct acpi_bus_event *entry = NULL;
 332
 333         DECLARE_WAITQUEUE(wait, current);
 334
 335
 336         if (!event)
 337                 return -EINVAL;
 338
 339         if (list_empty(&acpi_bus_event_list)) {
 340
 341                 set_current_state(TASK_INTERRUPTIBLE);
 342                 add_wait_queue(&acpi_bus_event_queue, &wait);
 343
 344                 if (list_empty(&acpi_bus_event_list))
 345                         schedule();
 346
 347                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 348                 set_current_state(TASK_RUNNING);
 349
 350                 if (signal_pending(current))
 351                         return -ERESTARTSYS;
 352         }
 353
 354         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 355         entry =
 356             list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node);
 357         if (entry)
 358                 list_del(&entry->node);
 359         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 360
 361         if (!entry)
 362                 return -ENODEV;
 363
 364         memcpy(event, entry, sizeof(struct acpi_bus_event));
 365
 366         kfree(entry);
 367
 368         return 0;
 369 }
 370
 371 EXPORT_SYMBOL(acpi_bus_receive_event);
 372 #endif  /* CONFIG_ACPI_PROC_EVENT */
 373
 374 /* --------------------------------------------------------------------------
 375                              Notification Handling
 376    -------------------------------------------------------------------------- */
 377
 378 static int
 379 acpi_bus_check_device(struct acpi_device *device, int *status_changed)
 380 {
 381         acpi_status status = 0;
 382         struct acpi_device_status old_status;
 383
 384
 385         if (!device)
 386                 return -EINVAL;
 387
 388         if (status_changed)
 389                 *status_changed = 0;
 390
 391         old_status = device->status;
 392
 393         /*
 394          * Make sure this device's parent is present before we go about
 395          * messing with the device.
 396          */
 397         if (device->parent && !device->parent->status.present) {
 398                 device->status = device->parent->status;
 399                 if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
 400                         if (status_changed)
 401                                 *status_changed = 1;
 402                 }
 403                 return 0;
 404         }
 405
 406         status = acpi_bus_get_status(device);
 407         if (ACPI_FAILURE(status))
 408                 return -ENODEV;
 409
 410         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 411                 return 0;
 412
 413         if (status_changed)
 414                 *status_changed = 1;
 415
 416         /*
 417          * Device Insertion/Removal
 418          */
 419         if ((device->status.present) && !(old_status.present)) {
 420                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 421                 /* TBD: Handle device insertion */
 422         } else if (!(device->status.present) && (old_status.present)) {
 423                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 424                 /* TBD: Handle device removal */
 425         }
 426
 427         return 0;
 428 }
 429
 430 static int acpi_bus_check_scope(struct acpi_device *device)
 431 {
 432         int result = 0;
 433         int status_changed = 0;
 434
 435
 436         if (!device)
 437                 return -EINVAL;
 438
 439         /* Status Change? */
 440         result = acpi_bus_check_device(device, &status_changed);
 441         if (result)
 442                 return result;
 443
 444         if (!status_changed)
 445                 return 0;
 446
 447         /*
 448          * TBD: Enumerate child devices within this device's scope and
 449          *       run acpi_bus_check_device()'s on them.
 450          */
 451
 452         return 0;
 453 }
 454
 455 /**
 456  * acpi_bus_notify
 457  * ---------------
 458  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 459  */
 460 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 461 {
 462         int result = 0;
 463         struct acpi_device *device = NULL;
 464
 465
 466         if (acpi_bus_get_device(handle, &device))
 467                 return;
 468
 469         switch (type) {
 470
 471         case ACPI_NOTIFY_BUS_CHECK:
 472                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 473                                   "Received BUS CHECK notification for device [%s]\n",
 474                                   device->pnp.bus_id));
 475                 result = acpi_bus_check_scope(device);
 476                 /*
 477                  * TBD: We'll need to outsource certain events to non-ACPI
 478                  *      drivers via the device manager (device.c).
 479                  */
 480                 break;
 481
 482         case ACPI_NOTIFY_DEVICE_CHECK:
 483                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 484                                   "Received DEVICE CHECK notification for device [%s]\n",
 485                                   device->pnp.bus_id));
 486                 result = acpi_bus_check_device(device, NULL);
 487                 /*
 488                  * TBD: We'll need to outsource certain events to non-ACPI
 489                  *      drivers via the device manager (device.c).
 490                  */
 491                 break;
 492
 493         case ACPI_NOTIFY_DEVICE_WAKE:
 494                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 495                                   "Received DEVICE WAKE notification for device [%s]\n",
 496                                   device->pnp.bus_id));
 497                 /* TBD */
 498                 break;
 499
 500         case ACPI_NOTIFY_EJECT_REQUEST:
 501                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 502                                   "Received EJECT REQUEST notification for device [%s]\n",
 503                                   device->pnp.bus_id));
 504                 /* TBD */
 505                 break;
 506
 507         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 508                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 509                                   "Received DEVICE CHECK LIGHT notification for device [%s]\n",
 510                                   device->pnp.bus_id));
 511                 /* TBD: Exactly what does 'light' mean? */
 512                 break;
 513
 514         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 515                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 516                                   "Received FREQUENCY MISMATCH notification for device [%s]\n",
 517                                   device->pnp.bus_id));
 518                 /* TBD */
 519                 break;
 520
 521         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 522                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 523                                   "Received BUS MODE MISMATCH notification for device [%s]\n",
 524                                   device->pnp.bus_id));
 525                 /* TBD */
 526                 break;
 527
 528         case ACPI_NOTIFY_POWER_FAULT:
 529                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 530                                   "Received POWER FAULT notification for device [%s]\n",
 531                                   device->pnp.bus_id));
 532                 /* TBD */
 533                 break;
 534
 535         default:
 536                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 537                                   "Received unknown/unsupported notification [%08x]\n",
 538                                   type));
 539                 break;
 540         }
 541
 542         return;
 543 }
 544
 545 /* --------------------------------------------------------------------------
 546                              Initialization/Cleanup
 547    -------------------------------------------------------------------------- */
 548
 549 static int __init acpi_bus_init_irq(void)
 550 {
 551         acpi_status status = AE_OK;
 552         union acpi_object arg = { ACPI_TYPE_INTEGER };
 553         struct acpi_object_list arg_list = { 1, &arg };
 554         char *message = NULL;
 555
 556
 557         /*
 558          * Let the system know what interrupt model we are using by
 559          * evaluating the \_PIC object, if exists.
 560          */
 561
 562         switch (acpi_irq_model) {
 563         case ACPI_IRQ_MODEL_PIC:
 564                 message = "PIC";
 565                 break;
 566         case ACPI_IRQ_MODEL_IOAPIC:
 567                 message = "IOAPIC";
 568                 break;
 569         case ACPI_IRQ_MODEL_IOSAPIC:
 570                 message = "IOSAPIC";
 571                 break;
 572         case ACPI_IRQ_MODEL_PLATFORM:
 573                 message = "platform specific model";
 574                 break;
 575         default:
 576                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 577                 return -ENODEV;
 578         }
 579
 580         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 581
 582         arg.integer.value = acpi_irq_model;
 583
 584         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 585         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 586                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 587                 return -ENODEV;
 588         }
 589
 590         return 0;
 591 }
 592
 593 acpi_native_uint acpi_gbl_permanent_mmap;
 594
 595
 596 void __init acpi_early_init(void)
 597 {
 598         acpi_status status = AE_OK;
 599
 600         if (acpi_disabled)
 601                 return;
 602
 603         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 604
 605         /* enable workarounds, unless strict ACPI spec. compliance */
 606         if (!acpi_strict)
 607                 acpi_gbl_enable_interpreter_slack = TRUE;
 608
 609         acpi_gbl_permanent_mmap = 1;
 610
 611         status = acpi_reallocate_root_table();
 612         if (ACPI_FAILURE(status)) {
 613                 printk(KERN_ERR PREFIX
 614                        "Unable to reallocate ACPI tables\n");
 615                 goto error0;
 616         }
 617
 618         status = acpi_initialize_subsystem();
 619         if (ACPI_FAILURE(status)) {
 620                 printk(KERN_ERR PREFIX
 621                        "Unable to initialize the ACPI Interpreter\n");
 622                 goto error0;
 623         }
 624
 625         status = acpi_load_tables();
 626         if (ACPI_FAILURE(status)) {
 627                 printk(KERN_ERR PREFIX
 628                        "Unable to load the System Description Tables\n");
 629                 goto error0;
 630         }
 631
 632 #ifdef CONFIG_X86
 633         if (!acpi_ioapic) {
 634                 extern u8 acpi_sci_flags;
 635
 636                 /* compatible (0) means level (3) */
 637                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 638                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 639                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 640                 }
 641                 /* Set PIC-mode SCI trigger type */
 642                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 643                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 644         } else {
 645                 extern int acpi_sci_override_gsi;
 646                 /*
 647                  * now that acpi_gbl_FADT is initialized,
 648                  * update it with result from INT_SRC_OVR parsing
 649                  */
 650                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 651         }
 652 #endif
 653
 654         status =
 655             acpi_enable_subsystem(~
 656                                   (ACPI_NO_HARDWARE_INIT |
 657                                    ACPI_NO_ACPI_ENABLE));
 658         if (ACPI_FAILURE(status)) {
 659                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 660                 goto error0;
 661         }
 662
 663         return;
 664
 665       error0:
 666         disable_acpi();
 667         return;
 668 }
 669
 670 static int __init acpi_bus_init(void)
 671 {
 672         int result = 0;
 673         acpi_status status = AE_OK;
 674         extern acpi_status acpi_os_initialize1(void);
 675
 676
 677         status = acpi_os_initialize1();
 678
 679         status =
 680             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 681         if (ACPI_FAILURE(status)) {
 682                 printk(KERN_ERR PREFIX
 683                        "Unable to start the ACPI Interpreter\n");
 684                 goto error1;
 685         }
 686
 687         if (ACPI_FAILURE(status)) {
 688                 printk(KERN_ERR PREFIX
 689                        "Unable to initialize ACPI OS objects\n");
 690                 goto error1;
 691         }
 692 #ifdef CONFIG_ACPI_EC
 693         /*
 694          * ACPI 2.0 requires the EC driver to be loaded and work before
 695          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 696          * is called).
 697          *
 698          * This is accomplished by looking for the ECDT table, and getting
 699          * the EC parameters out of that.
 700          */
 701         status = acpi_ec_ecdt_probe();
 702         /* Ignore result. Not having an ECDT is not fatal. */
 703 #endif
 704
 705         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 706         if (ACPI_FAILURE(status)) {
 707                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 708                 goto error1;
 709         }
 710
 711         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 712
 713         /* Initialize sleep structures */
 714         acpi_sleep_init();
 715
 716         /*
 717          * Get the system interrupt model and evaluate \_PIC.
 718          */
 719         result = acpi_bus_init_irq();
 720         if (result)
 721                 goto error1;
 722
 723         /*
 724          * Register the for all standard device notifications.
 725          */
 726         status =
 727             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 728                                         &acpi_bus_notify, NULL);
 729         if (ACPI_FAILURE(status)) {
 730                 printk(KERN_ERR PREFIX
 731                        "Unable to register for device notifications\n");
 732                 goto error1;
 733         }
 734
 735         /*
 736          * Create the top ACPI proc directory
 737          */
 738         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 739
 740         return 0;
 741
 742         /* Mimic structured exception handling */
 743       error1:
 744         acpi_terminate();
 745         return -ENODEV;
 746 }
 747
 748 struct kset *acpi_kset;
 749
 750 static int __init acpi_init(void)
 751 {
 752         int result = 0;
 753
 754
 755         if (acpi_disabled) {
 756                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 757                 return -ENODEV;
 758         }
 759
 760         acpi_kset = kset_create_and_register("acpi", NULL, firmware_kobj,
 761                                              NULL);
 762         if (!acpi_kset) {
 763                 printk(KERN_WARNING "%s: kset create error\n", __FUNCTION__);
 764                 acpi_kset = NULL;
 765         }
 766
 767         result = acpi_bus_init();
 768
 769         if (!result) {
 770                 pci_mmcfg_late_init();
 771 #ifdef CONFIG_PM_LEGACY
 772                 if (!PM_IS_ACTIVE())
 773                         pm_active = 1;
 774                 else {
 775                         printk(KERN_INFO PREFIX
 776                                "APM is already active, exiting\n");
 777                         disable_acpi();
 778                         result = -ENODEV;
 779                 }
 780 #endif
 781         } else
 782                 disable_acpi();
 783
 784         return result;
 785 }
 786
 787 subsys_initcall(acpi_init);