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 #ifdef CONFIG_X86
  35 #include <asm/mpspec.h>
  36 #endif
  37 #include <acpi/acpi_bus.h>
  38 #include <acpi/acpi_drivers.h>
  39
  40 #define _COMPONENT              ACPI_BUS_COMPONENT
  41 ACPI_MODULE_NAME("bus");
  42 #ifdef  CONFIG_X86
  43 extern void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger);
  44 #endif
  45
  46 struct acpi_device *acpi_root;
  47 struct proc_dir_entry *acpi_root_dir;
  48 EXPORT_SYMBOL(acpi_root_dir);
  49
  50 #define STRUCT_TO_INT(s)        (*((int*)&s))
  51
  52 /* --------------------------------------------------------------------------
  53                                 Device Management
  54    -------------------------------------------------------------------------- */
  55
  56 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
  57 {
  58         acpi_status status = AE_OK;
  59
  60
  61         if (!device)
  62                 return -EINVAL;
  63
  64         /* TBD: Support fixed-feature devices */
  65
  66         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
  67         if (ACPI_FAILURE(status) || !*device) {
  68                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
  69                                   handle));
  70                 return -ENODEV;
  71         }
  72
  73         return 0;
  74 }
  75
  76 EXPORT_SYMBOL(acpi_bus_get_device);
  77
  78 int acpi_bus_get_status(struct acpi_device *device)
  79 {
  80         acpi_status status = AE_OK;
  81         unsigned long sta = 0;
  82
  83
  84         if (!device)
  85                 return -EINVAL;
  86
  87         /*
  88          * Evaluate _STA if present.
  89          */
  90         if (device->flags.dynamic_status) {
  91                 status =
  92                     acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
  93                 if (ACPI_FAILURE(status))
  94                         return -ENODEV;
  95                 STRUCT_TO_INT(device->status) = (int)sta;
  96         }
  97
  98         /*
  99          * Otherwise we assume the status of our parent (unless we don't
 100          * have one, in which case status is implied).
 101          */
 102         else if (device->parent)
 103                 device->status = device->parent->status;
 104         else
 105                 STRUCT_TO_INT(device->status) =
 106                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 107                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 108
 109         if (device->status.functional && !device->status.present) {
 110                 printk(KERN_WARNING PREFIX "Device [%s] status [%08x]: "
 111                        "functional but not present; setting present\n",
 112                        device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status));
 113                 device->status.present = 1;
 114         }
 115
 116         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 117                           device->pnp.bus_id,
 118                           (u32) STRUCT_TO_INT(device->status)));
 119
 120         return 0;
 121 }
 122
 123 EXPORT_SYMBOL(acpi_bus_get_status);
 124
 125 /* --------------------------------------------------------------------------
 126                                  Power Management
 127    -------------------------------------------------------------------------- */
 128
 129 int acpi_bus_get_power(acpi_handle handle, int *state)
 130 {
 131         int result = 0;
 132         acpi_status status = 0;
 133         struct acpi_device *device = NULL;
 134         unsigned long psc = 0;
 135
 136
 137         result = acpi_bus_get_device(handle, &device);
 138         if (result)
 139                 return result;
 140
 141         *state = ACPI_STATE_UNKNOWN;
 142
 143         if (!device->flags.power_manageable) {
 144                 /* TBD: Non-recursive algorithm for walking up hierarchy */
 145                 if (device->parent)
 146                         *state = device->parent->power.state;
 147                 else
 148                         *state = ACPI_STATE_D0;
 149         } else {
 150                 /*
 151                  * Get the device's power state either directly (via _PSC) or
 152                  * indirectly (via power resources).
 153                  */
 154                 if (device->power.flags.explicit_get) {
 155                         status = acpi_evaluate_integer(device->handle, "_PSC",
 156                                                        NULL, &psc);
 157                         if (ACPI_FAILURE(status))
 158                                 return -ENODEV;
 159                         device->power.state = (int)psc;
 160                 } else if (device->power.flags.power_resources) {
 161                         result = acpi_power_get_inferred_state(device);
 162                         if (result)
 163                                 return result;
 164                 }
 165
 166                 *state = device->power.state;
 167         }
 168
 169         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
 170                           device->pnp.bus_id, device->power.state));
 171
 172         return 0;
 173 }
 174
 175 EXPORT_SYMBOL(acpi_bus_get_power);
 176
 177 int acpi_bus_set_power(acpi_handle handle, int state)
 178 {
 179         int result = 0;
 180         acpi_status status = AE_OK;
 181         struct acpi_device *device = NULL;
 182         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 183
 184
 185         result = acpi_bus_get_device(handle, &device);
 186         if (result)
 187                 return result;
 188
 189         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
 190                 return -EINVAL;
 191
 192         /* Make sure this is a valid target state */
 193
 194         if (!device->flags.power_manageable) {
 195                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
 196                                 kobject_name(&device->dev.kobj)));
 197                 return -ENODEV;
 198         }
 199         /*
 200          * Get device's current power state
 201          */
 202         acpi_bus_get_power(device->handle, &device->power.state);
 203         if ((state == device->power.state) && !device->flags.force_power_state) {
 204                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
 205                                   state));
 206                 return 0;
 207         }
 208
 209         if (!device->power.states[state].flags.valid) {
 210                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
 211                 return -ENODEV;
 212         }
 213         if (device->parent && (state < device->parent->power.state)) {
 214                 printk(KERN_WARNING PREFIX
 215                               "Cannot set device to a higher-powered"
 216                               " state than parent\n");
 217                 return -ENODEV;
 218         }
 219
 220         /*
 221          * Transition Power
 222          * ----------------
 223          * On transitions to a high-powered state we first apply power (via
 224          * power resources) then evalute _PSx.  Conversly for transitions to
 225          * a lower-powered state.
 226          */
 227         if (state < device->power.state) {
 228                 if (device->power.flags.power_resources) {
 229                         result = acpi_power_transition(device, state);
 230                         if (result)
 231                                 goto end;
 232                 }
 233                 if (device->power.states[state].flags.explicit_set) {
 234                         status = acpi_evaluate_object(device->handle,
 235                                                       object_name, NULL, NULL);
 236                         if (ACPI_FAILURE(status)) {
 237                                 result = -ENODEV;
 238                                 goto end;
 239                         }
 240                 }
 241         } else {
 242                 if (device->power.states[state].flags.explicit_set) {
 243                         status = acpi_evaluate_object(device->handle,
 244                                                       object_name, NULL, NULL);
 245                         if (ACPI_FAILURE(status)) {
 246                                 result = -ENODEV;
 247                                 goto end;
 248                         }
 249                 }
 250                 if (device->power.flags.power_resources) {
 251                         result = acpi_power_transition(device, state);
 252                         if (result)
 253                                 goto end;
 254                 }
 255         }
 256
 257       end:
 258         if (result)
 259                 printk(KERN_WARNING PREFIX
 260                               "Transitioning device [%s] to D%d\n",
 261                               device->pnp.bus_id, state);
 262         else {
 263                 device->power.state = state;
 264                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 265                                   "Device [%s] transitioned to D%d\n",
 266                                   device->pnp.bus_id, state));
 267         }
 268
 269         return result;
 270 }
 271
 272 EXPORT_SYMBOL(acpi_bus_set_power);
 273
 274 /* --------------------------------------------------------------------------
 275                                 Event Management
 276    -------------------------------------------------------------------------- */
 277
 278 #ifdef CONFIG_ACPI_PROC_EVENT
 279 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 280
 281 LIST_HEAD(acpi_bus_event_list);
 282 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 283
 284 extern int event_is_open;
 285
 286 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 287 {
 288         struct acpi_bus_event *event;
 289         unsigned long flags = 0;
 290
 291         /* drop event on the floor if no one's listening */
 292         if (!event_is_open)
 293                 return 0;
 294
 295         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 296         if (!event)
 297                 return -ENOMEM;
 298
 299         strcpy(event->device_class, device_class);
 300         strcpy(event->bus_id, bus_id);
 301         event->type = type;
 302         event->data = data;
 303
 304         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 305         list_add_tail(&event->node, &acpi_bus_event_list);
 306         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 307
 308         wake_up_interruptible(&acpi_bus_event_queue);
 309
 310         return 0;
 311
 312 }
 313
 314 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 315
 316 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 317 {
 318         if (!device)
 319                 return -EINVAL;
 320         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 321                                              device->pnp.bus_id, type, data);
 322 }
 323
 324 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 325
 326 int acpi_bus_receive_event(struct acpi_bus_event *event)
 327 {
 328         unsigned long flags = 0;
 329         struct acpi_bus_event *entry = NULL;
 330
 331         DECLARE_WAITQUEUE(wait, current);
 332
 333
 334         if (!event)
 335                 return -EINVAL;
 336
 337         if (list_empty(&acpi_bus_event_list)) {
 338
 339                 set_current_state(TASK_INTERRUPTIBLE);
 340                 add_wait_queue(&acpi_bus_event_queue, &wait);
 341
 342                 if (list_empty(&acpi_bus_event_list))
 343                         schedule();
 344
 345                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 346                 set_current_state(TASK_RUNNING);
 347
 348                 if (signal_pending(current))
 349                         return -ERESTARTSYS;
 350         }
 351
 352         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 353         entry =
 354             list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node);
 355         if (entry)
 356                 list_del(&entry->node);
 357         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 358
 359         if (!entry)
 360                 return -ENODEV;
 361
 362         memcpy(event, entry, sizeof(struct acpi_bus_event));
 363
 364         kfree(entry);
 365
 366         return 0;
 367 }
 368
 369 #endif  /* CONFIG_ACPI_PROC_EVENT */
 370
 371 /* --------------------------------------------------------------------------
 372                              Notification Handling
 373    -------------------------------------------------------------------------- */
 374
 375 static int
 376 acpi_bus_check_device(struct acpi_device *device, int *status_changed)
 377 {
 378         acpi_status status = 0;
 379         struct acpi_device_status old_status;
 380
 381
 382         if (!device)
 383                 return -EINVAL;
 384
 385         if (status_changed)
 386                 *status_changed = 0;
 387
 388         old_status = device->status;
 389
 390         /*
 391          * Make sure this device's parent is present before we go about
 392          * messing with the device.
 393          */
 394         if (device->parent && !device->parent->status.present) {
 395                 device->status = device->parent->status;
 396                 if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
 397                         if (status_changed)
 398                                 *status_changed = 1;
 399                 }
 400                 return 0;
 401         }
 402
 403         status = acpi_bus_get_status(device);
 404         if (ACPI_FAILURE(status))
 405                 return -ENODEV;
 406
 407         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 408                 return 0;
 409
 410         if (status_changed)
 411                 *status_changed = 1;
 412
 413         /*
 414          * Device Insertion/Removal
 415          */
 416         if ((device->status.present) && !(old_status.present)) {
 417                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 418                 /* TBD: Handle device insertion */
 419         } else if (!(device->status.present) && (old_status.present)) {
 420                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 421                 /* TBD: Handle device removal */
 422         }
 423
 424         return 0;
 425 }
 426
 427 static int acpi_bus_check_scope(struct acpi_device *device)
 428 {
 429         int result = 0;
 430         int status_changed = 0;
 431
 432
 433         if (!device)
 434                 return -EINVAL;
 435
 436         /* Status Change? */
 437         result = acpi_bus_check_device(device, &status_changed);
 438         if (result)
 439                 return result;
 440
 441         if (!status_changed)
 442                 return 0;
 443
 444         /*
 445          * TBD: Enumerate child devices within this device's scope and
 446          *       run acpi_bus_check_device()'s on them.
 447          */
 448
 449         return 0;
 450 }
 451
 452 /**
 453  * acpi_bus_notify
 454  * ---------------
 455  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 456  */
 457 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 458 {
 459         int result = 0;
 460         struct acpi_device *device = NULL;
 461
 462
 463         if (acpi_bus_get_device(handle, &device))
 464                 return;
 465
 466         switch (type) {
 467
 468         case ACPI_NOTIFY_BUS_CHECK:
 469                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 470                                   "Received BUS CHECK notification for device [%s]\n",
 471                                   device->pnp.bus_id));
 472                 result = acpi_bus_check_scope(device);
 473                 /*
 474                  * TBD: We'll need to outsource certain events to non-ACPI
 475                  *      drivers via the device manager (device.c).
 476                  */
 477                 break;
 478
 479         case ACPI_NOTIFY_DEVICE_CHECK:
 480                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 481                                   "Received DEVICE CHECK notification for device [%s]\n",
 482                                   device->pnp.bus_id));
 483                 result = acpi_bus_check_device(device, NULL);
 484                 /*
 485                  * TBD: We'll need to outsource certain events to non-ACPI
 486                  *      drivers via the device manager (device.c).
 487                  */
 488                 break;
 489
 490         case ACPI_NOTIFY_DEVICE_WAKE:
 491                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 492                                   "Received DEVICE WAKE notification for device [%s]\n",
 493                                   device->pnp.bus_id));
 494                 /* TBD */
 495                 break;
 496
 497         case ACPI_NOTIFY_EJECT_REQUEST:
 498                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 499                                   "Received EJECT REQUEST notification for device [%s]\n",
 500                                   device->pnp.bus_id));
 501                 /* TBD */
 502                 break;
 503
 504         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 505                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 506                                   "Received DEVICE CHECK LIGHT notification for device [%s]\n",
 507                                   device->pnp.bus_id));
 508                 /* TBD: Exactly what does 'light' mean? */
 509                 break;
 510
 511         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 512                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 513                                   "Received FREQUENCY MISMATCH notification for device [%s]\n",
 514                                   device->pnp.bus_id));
 515                 /* TBD */
 516                 break;
 517
 518         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 519                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 520                                   "Received BUS MODE MISMATCH notification for device [%s]\n",
 521                                   device->pnp.bus_id));
 522                 /* TBD */
 523                 break;
 524
 525         case ACPI_NOTIFY_POWER_FAULT:
 526                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 527                                   "Received POWER FAULT notification for device [%s]\n",
 528                                   device->pnp.bus_id));
 529                 /* TBD */
 530                 break;
 531
 532         default:
 533                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 534                                   "Received unknown/unsupported notification [%08x]\n",
 535                                   type));
 536                 break;
 537         }
 538
 539         return;
 540 }
 541
 542 /* --------------------------------------------------------------------------
 543                              Initialization/Cleanup
 544    -------------------------------------------------------------------------- */
 545
 546 static int __init acpi_bus_init_irq(void)
 547 {
 548         acpi_status status = AE_OK;
 549         union acpi_object arg = { ACPI_TYPE_INTEGER };
 550         struct acpi_object_list arg_list = { 1, &arg };
 551         char *message = NULL;
 552
 553
 554         /*
 555          * Let the system know what interrupt model we are using by
 556          * evaluating the \_PIC object, if exists.
 557          */
 558
 559         switch (acpi_irq_model) {
 560         case ACPI_IRQ_MODEL_PIC:
 561                 message = "PIC";
 562                 break;
 563         case ACPI_IRQ_MODEL_IOAPIC:
 564                 message = "IOAPIC";
 565                 break;
 566         case ACPI_IRQ_MODEL_IOSAPIC:
 567                 message = "IOSAPIC";
 568                 break;
 569         case ACPI_IRQ_MODEL_PLATFORM:
 570                 message = "platform specific model";
 571                 break;
 572         default:
 573                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 574                 return -ENODEV;
 575         }
 576
 577         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 578
 579         arg.integer.value = acpi_irq_model;
 580
 581         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 582         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 583                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 584                 return -ENODEV;
 585         }
 586
 587         return 0;
 588 }
 589
 590 acpi_native_uint acpi_gbl_permanent_mmap;
 591
 592
 593 void __init acpi_early_init(void)
 594 {
 595         acpi_status status = AE_OK;
 596
 597         if (acpi_disabled)
 598                 return;
 599
 600         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 601
 602         /* enable workarounds, unless strict ACPI spec. compliance */
 603         if (!acpi_strict)
 604                 acpi_gbl_enable_interpreter_slack = TRUE;
 605
 606         acpi_gbl_permanent_mmap = 1;
 607
 608         status = acpi_reallocate_root_table();
 609         if (ACPI_FAILURE(status)) {
 610                 printk(KERN_ERR PREFIX
 611                        "Unable to reallocate ACPI tables\n");
 612                 goto error0;
 613         }
 614
 615         status = acpi_initialize_subsystem();
 616         if (ACPI_FAILURE(status)) {
 617                 printk(KERN_ERR PREFIX
 618                        "Unable to initialize the ACPI Interpreter\n");
 619                 goto error0;
 620         }
 621
 622         status = acpi_load_tables();
 623         if (ACPI_FAILURE(status)) {
 624                 printk(KERN_ERR PREFIX
 625                        "Unable to load the System Description Tables\n");
 626                 goto error0;
 627         }
 628
 629 #ifdef CONFIG_X86
 630         if (!acpi_ioapic) {
 631                 extern u8 acpi_sci_flags;
 632
 633                 /* compatible (0) means level (3) */
 634                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 635                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 636                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 637                 }
 638                 /* Set PIC-mode SCI trigger type */
 639                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 640                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 641         } else {
 642                 extern int acpi_sci_override_gsi;
 643                 /*
 644                  * now that acpi_gbl_FADT is initialized,
 645                  * update it with result from INT_SRC_OVR parsing
 646                  */
 647                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 648         }
 649 #endif
 650
 651         status =
 652             acpi_enable_subsystem(~
 653                                   (ACPI_NO_HARDWARE_INIT |
 654                                    ACPI_NO_ACPI_ENABLE));
 655         if (ACPI_FAILURE(status)) {
 656                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 657                 goto error0;
 658         }
 659
 660         return;
 661
 662       error0:
 663         disable_acpi();
 664         return;
 665 }
 666
 667 static int __init acpi_bus_init(void)
 668 {
 669         int result = 0;
 670         acpi_status status = AE_OK;
 671         extern acpi_status acpi_os_initialize1(void);
 672
 673
 674         status = acpi_os_initialize1();
 675
 676         status =
 677             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 678         if (ACPI_FAILURE(status)) {
 679                 printk(KERN_ERR PREFIX
 680                        "Unable to start the ACPI Interpreter\n");
 681                 goto error1;
 682         }
 683
 684         if (ACPI_FAILURE(status)) {
 685                 printk(KERN_ERR PREFIX
 686                        "Unable to initialize ACPI OS objects\n");
 687                 goto error1;
 688         }
 689 #ifdef CONFIG_ACPI_EC
 690         /*
 691          * ACPI 2.0 requires the EC driver to be loaded and work before
 692          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 693          * is called).
 694          *
 695          * This is accomplished by looking for the ECDT table, and getting
 696          * the EC parameters out of that.
 697          */
 698         status = acpi_ec_ecdt_probe();
 699         /* Ignore result. Not having an ECDT is not fatal. */
 700 #endif
 701
 702         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 703         if (ACPI_FAILURE(status)) {
 704                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 705                 goto error1;
 706         }
 707
 708         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 709
 710         /* Initialize sleep structures */
 711         acpi_sleep_init();
 712
 713         /*
 714          * Get the system interrupt model and evaluate \_PIC.
 715          */
 716         result = acpi_bus_init_irq();
 717         if (result)
 718                 goto error1;
 719
 720         /*
 721          * Register the for all standard device notifications.
 722          */
 723         status =
 724             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 725                                         &acpi_bus_notify, NULL);
 726         if (ACPI_FAILURE(status)) {
 727                 printk(KERN_ERR PREFIX
 728                        "Unable to register for device notifications\n");
 729                 goto error1;
 730         }
 731
 732         /*
 733          * Create the top ACPI proc directory
 734          */
 735         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 736
 737         return 0;
 738
 739         /* Mimic structured exception handling */
 740       error1:
 741         acpi_terminate();
 742         return -ENODEV;
 743 }
 744
 745 struct kobject *acpi_kobj;
 746
 747 static int __init acpi_init(void)
 748 {
 749         int result = 0;
 750
 751
 752         if (acpi_disabled) {
 753                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 754                 return -ENODEV;
 755         }
 756
 757         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
 758         if (!acpi_kobj) {
 759                 printk(KERN_WARNING "%s: kset create error\n", __FUNCTION__);
 760                 acpi_kobj = NULL;
 761         }
 762
 763         result = acpi_bus_init();
 764
 765         if (!result) {
 766                 if (!(pm_flags & PM_APM))
 767                         pm_flags |= PM_ACPI;
 768                 else {
 769                         printk(KERN_INFO PREFIX
 770                                "APM is already active, exiting\n");
 771                         disable_acpi();
 772                         result = -ENODEV;
 773                 }
 774         } else
 775                 disable_acpi();
 776
 777         return result;
 778 }
 779
 780 subsys_initcall(acpi_init);