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 EXPORT_SYMBOL(acpi_bus_receive_event);
 370 #endif  /* CONFIG_ACPI_PROC_EVENT */
 371
 372 /* --------------------------------------------------------------------------
 373                              Notification Handling
 374    -------------------------------------------------------------------------- */
 375
 376 static int
 377 acpi_bus_check_device(struct acpi_device *device, int *status_changed)
 378 {
 379         acpi_status status = 0;
 380         struct acpi_device_status old_status;
 381
 382
 383         if (!device)
 384                 return -EINVAL;
 385
 386         if (status_changed)
 387                 *status_changed = 0;
 388
 389         old_status = device->status;
 390
 391         /*
 392          * Make sure this device's parent is present before we go about
 393          * messing with the device.
 394          */
 395         if (device->parent && !device->parent->status.present) {
 396                 device->status = device->parent->status;
 397                 if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
 398                         if (status_changed)
 399                                 *status_changed = 1;
 400                 }
 401                 return 0;
 402         }
 403
 404         status = acpi_bus_get_status(device);
 405         if (ACPI_FAILURE(status))
 406                 return -ENODEV;
 407
 408         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 409                 return 0;
 410
 411         if (status_changed)
 412                 *status_changed = 1;
 413
 414         /*
 415          * Device Insertion/Removal
 416          */
 417         if ((device->status.present) && !(old_status.present)) {
 418                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 419                 /* TBD: Handle device insertion */
 420         } else if (!(device->status.present) && (old_status.present)) {
 421                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 422                 /* TBD: Handle device removal */
 423         }
 424
 425         return 0;
 426 }
 427
 428 static int acpi_bus_check_scope(struct acpi_device *device)
 429 {
 430         int result = 0;
 431         int status_changed = 0;
 432
 433
 434         if (!device)
 435                 return -EINVAL;
 436
 437         /* Status Change? */
 438         result = acpi_bus_check_device(device, &status_changed);
 439         if (result)
 440                 return result;
 441
 442         if (!status_changed)
 443                 return 0;
 444
 445         /*
 446          * TBD: Enumerate child devices within this device's scope and
 447          *       run acpi_bus_check_device()'s on them.
 448          */
 449
 450         return 0;
 451 }
 452
 453 /**
 454  * acpi_bus_notify
 455  * ---------------
 456  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 457  */
 458 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 459 {
 460         int result = 0;
 461         struct acpi_device *device = NULL;
 462
 463
 464         if (acpi_bus_get_device(handle, &device))
 465                 return;
 466
 467         switch (type) {
 468
 469         case ACPI_NOTIFY_BUS_CHECK:
 470                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 471                                   "Received BUS CHECK notification for device [%s]\n",
 472                                   device->pnp.bus_id));
 473                 result = acpi_bus_check_scope(device);
 474                 /*
 475                  * TBD: We'll need to outsource certain events to non-ACPI
 476                  *      drivers via the device manager (device.c).
 477                  */
 478                 break;
 479
 480         case ACPI_NOTIFY_DEVICE_CHECK:
 481                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 482                                   "Received DEVICE CHECK notification for device [%s]\n",
 483                                   device->pnp.bus_id));
 484                 result = acpi_bus_check_device(device, NULL);
 485                 /*
 486                  * TBD: We'll need to outsource certain events to non-ACPI
 487                  *      drivers via the device manager (device.c).
 488                  */
 489                 break;
 490
 491         case ACPI_NOTIFY_DEVICE_WAKE:
 492                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 493                                   "Received DEVICE WAKE notification for device [%s]\n",
 494                                   device->pnp.bus_id));
 495                 /* TBD */
 496                 break;
 497
 498         case ACPI_NOTIFY_EJECT_REQUEST:
 499                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 500                                   "Received EJECT REQUEST notification for device [%s]\n",
 501                                   device->pnp.bus_id));
 502                 /* TBD */
 503                 break;
 504
 505         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 506                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 507                                   "Received DEVICE CHECK LIGHT notification for device [%s]\n",
 508                                   device->pnp.bus_id));
 509                 /* TBD: Exactly what does 'light' mean? */
 510                 break;
 511
 512         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 513                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 514                                   "Received FREQUENCY MISMATCH notification for device [%s]\n",
 515                                   device->pnp.bus_id));
 516                 /* TBD */
 517                 break;
 518
 519         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 520                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 521                                   "Received BUS MODE MISMATCH notification for device [%s]\n",
 522                                   device->pnp.bus_id));
 523                 /* TBD */
 524                 break;
 525
 526         case ACPI_NOTIFY_POWER_FAULT:
 527                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 528                                   "Received POWER FAULT notification for device [%s]\n",
 529                                   device->pnp.bus_id));
 530                 /* TBD */
 531                 break;
 532
 533         default:
 534                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 535                                   "Received unknown/unsupported notification [%08x]\n",
 536                                   type));
 537                 break;
 538         }
 539
 540         return;
 541 }
 542
 543 /* --------------------------------------------------------------------------
 544                              Initialization/Cleanup
 545    -------------------------------------------------------------------------- */
 546
 547 static int __init acpi_bus_init_irq(void)
 548 {
 549         acpi_status status = AE_OK;
 550         union acpi_object arg = { ACPI_TYPE_INTEGER };
 551         struct acpi_object_list arg_list = { 1, &arg };
 552         char *message = NULL;
 553
 554
 555         /*
 556          * Let the system know what interrupt model we are using by
 557          * evaluating the \_PIC object, if exists.
 558          */
 559
 560         switch (acpi_irq_model) {
 561         case ACPI_IRQ_MODEL_PIC:
 562                 message = "PIC";
 563                 break;
 564         case ACPI_IRQ_MODEL_IOAPIC:
 565                 message = "IOAPIC";
 566                 break;
 567         case ACPI_IRQ_MODEL_IOSAPIC:
 568                 message = "IOSAPIC";
 569                 break;
 570         case ACPI_IRQ_MODEL_PLATFORM:
 571                 message = "platform specific model";
 572                 break;
 573         default:
 574                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 575                 return -ENODEV;
 576         }
 577
 578         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 579
 580         arg.integer.value = acpi_irq_model;
 581
 582         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 583         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 584                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 585                 return -ENODEV;
 586         }
 587
 588         return 0;
 589 }
 590
 591 acpi_native_uint acpi_gbl_permanent_mmap;
 592
 593
 594 void __init acpi_early_init(void)
 595 {
 596         acpi_status status = AE_OK;
 597
 598         if (acpi_disabled)
 599                 return;
 600
 601         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 602
 603         /* enable workarounds, unless strict ACPI spec. compliance */
 604         if (!acpi_strict)
 605                 acpi_gbl_enable_interpreter_slack = TRUE;
 606
 607         acpi_gbl_permanent_mmap = 1;
 608
 609         status = acpi_reallocate_root_table();
 610         if (ACPI_FAILURE(status)) {
 611                 printk(KERN_ERR PREFIX
 612                        "Unable to reallocate ACPI tables\n");
 613                 goto error0;
 614         }
 615
 616         status = acpi_initialize_subsystem();
 617         if (ACPI_FAILURE(status)) {
 618                 printk(KERN_ERR PREFIX
 619                        "Unable to initialize the ACPI Interpreter\n");
 620                 goto error0;
 621         }
 622
 623         status = acpi_load_tables();
 624         if (ACPI_FAILURE(status)) {
 625                 printk(KERN_ERR PREFIX
 626                        "Unable to load the System Description Tables\n");
 627                 goto error0;
 628         }
 629
 630 #ifdef CONFIG_X86
 631         if (!acpi_ioapic) {
 632                 extern u8 acpi_sci_flags;
 633
 634                 /* compatible (0) means level (3) */
 635                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 636                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 637                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 638                 }
 639                 /* Set PIC-mode SCI trigger type */
 640                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 641                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 642         } else {
 643                 extern int acpi_sci_override_gsi;
 644                 /*
 645                  * now that acpi_gbl_FADT is initialized,
 646                  * update it with result from INT_SRC_OVR parsing
 647                  */
 648                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 649         }
 650 #endif
 651
 652         status =
 653             acpi_enable_subsystem(~
 654                                   (ACPI_NO_HARDWARE_INIT |
 655                                    ACPI_NO_ACPI_ENABLE));
 656         if (ACPI_FAILURE(status)) {
 657                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 658                 goto error0;
 659         }
 660
 661         return;
 662
 663       error0:
 664         disable_acpi();
 665         return;
 666 }
 667
 668 static int __init acpi_bus_init(void)
 669 {
 670         int result = 0;
 671         acpi_status status = AE_OK;
 672         extern acpi_status acpi_os_initialize1(void);
 673
 674
 675         status = acpi_os_initialize1();
 676
 677         status =
 678             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 679         if (ACPI_FAILURE(status)) {
 680                 printk(KERN_ERR PREFIX
 681                        "Unable to start the ACPI Interpreter\n");
 682                 goto error1;
 683         }
 684
 685         if (ACPI_FAILURE(status)) {
 686                 printk(KERN_ERR PREFIX
 687                        "Unable to initialize ACPI OS objects\n");
 688                 goto error1;
 689         }
 690 #ifdef CONFIG_ACPI_EC
 691         /*
 692          * ACPI 2.0 requires the EC driver to be loaded and work before
 693          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 694          * is called).
 695          *
 696          * This is accomplished by looking for the ECDT table, and getting
 697          * the EC parameters out of that.
 698          */
 699         status = acpi_ec_ecdt_probe();
 700         /* Ignore result. Not having an ECDT is not fatal. */
 701 #endif
 702
 703         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 704         if (ACPI_FAILURE(status)) {
 705                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 706                 goto error1;
 707         }
 708
 709         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 710
 711         /* Initialize sleep structures */
 712         acpi_sleep_init();
 713
 714         /*
 715          * Get the system interrupt model and evaluate \_PIC.
 716          */
 717         result = acpi_bus_init_irq();
 718         if (result)
 719                 goto error1;
 720
 721         /*
 722          * Register the for all standard device notifications.
 723          */
 724         status =
 725             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 726                                         &acpi_bus_notify, NULL);
 727         if (ACPI_FAILURE(status)) {
 728                 printk(KERN_ERR PREFIX
 729                        "Unable to register for device notifications\n");
 730                 goto error1;
 731         }
 732
 733         /*
 734          * Create the top ACPI proc directory
 735          */
 736         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 737
 738         return 0;
 739
 740         /* Mimic structured exception handling */
 741       error1:
 742         acpi_terminate();
 743         return -ENODEV;
 744 }
 745
 746 struct kobject *acpi_kobj;
 747
 748 static int __init acpi_init(void)
 749 {
 750         int result = 0;
 751
 752
 753         if (acpi_disabled) {
 754                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 755                 return -ENODEV;
 756         }
 757
 758         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
 759         if (!acpi_kobj) {
 760                 printk(KERN_WARNING "%s: kset create error\n", __FUNCTION__);
 761                 acpi_kobj = NULL;
 762         }
 763
 764         result = acpi_bus_init();
 765
 766         if (!result) {
 767                 if (!(pm_flags & PM_APM))
 768                         pm_flags |= PM_ACPI;
 769                 else {
 770                         printk(KERN_INFO PREFIX
 771                                "APM is already active, exiting\n");
 772                         disable_acpi();
 773                         result = -ENODEV;
 774                 }
 775         } else
 776                 disable_acpi();
 777
 778         return result;
 779 }
 780
 781 subsys_initcall(acpi_init);