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   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 <acpi/acpi_bus.h>
  39 #include <acpi/acpi_drivers.h>
  40
  41 #define _COMPONENT              ACPI_BUS_COMPONENT
  42 ACPI_MODULE_NAME("bus");
  43
  44 struct acpi_device *acpi_root;
  45 struct proc_dir_entry *acpi_root_dir;
  46 EXPORT_SYMBOL(acpi_root_dir);
  47
  48 #define STRUCT_TO_INT(s)        (*((int*)&s))
  49
  50 /* --------------------------------------------------------------------------
  51                                 Device Management
  52    -------------------------------------------------------------------------- */
  53
  54 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
  55 {
  56         acpi_status status = AE_OK;
  57
  58
  59         if (!device)
  60                 return -EINVAL;
  61
  62         /* TBD: Support fixed-feature devices */
  63
  64         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
  65         if (ACPI_FAILURE(status) || !*device) {
  66                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
  67                                   handle));
  68                 return -ENODEV;
  69         }
  70
  71         return 0;
  72 }
  73
  74 EXPORT_SYMBOL(acpi_bus_get_device);
  75
  76 int acpi_bus_get_status(struct acpi_device *device)
  77 {
  78         acpi_status status = AE_OK;
  79         unsigned long sta = 0;
  80
  81
  82         if (!device)
  83                 return -EINVAL;
  84
  85         /*
  86          * Evaluate _STA if present.
  87          */
  88         if (device->flags.dynamic_status) {
  89                 status =
  90                     acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
  91                 if (ACPI_FAILURE(status))
  92                         return -ENODEV;
  93                 STRUCT_TO_INT(device->status) = (int)sta;
  94         }
  95
  96         /*
  97          * Otherwise we assume the status of our parent (unless we don't
  98          * have one, in which case status is implied).
  99          */
 100         else if (device->parent)
 101                 device->status = device->parent->status;
 102         else
 103                 STRUCT_TO_INT(device->status) =
 104                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 105                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 106
 107         if (device->status.functional && !device->status.present) {
 108                 printk(KERN_WARNING PREFIX "Device [%s] status [%08x]: "
 109                        "functional but not present; setting present\n",
 110                        device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status));
 111                 device->status.present = 1;
 112         }
 113
 114         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 115                           device->pnp.bus_id,
 116                           (u32) STRUCT_TO_INT(device->status)));
 117
 118         return 0;
 119 }
 120
 121 EXPORT_SYMBOL(acpi_bus_get_status);
 122
 123 void acpi_bus_private_data_handler(acpi_handle handle,
 124                                    u32 function, void *context)
 125 {
 126         return;
 127 }
 128 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 129
 130 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 131 {
 132         acpi_status status = AE_OK;
 133
 134         if (!*data)
 135                 return -EINVAL;
 136
 137         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 138         if (ACPI_FAILURE(status) || !*data) {
 139                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 140                                 handle));
 141                 return -ENODEV;
 142         }
 143
 144         return 0;
 145 }
 146 EXPORT_SYMBOL(acpi_bus_get_private_data);
 147
 148 /* --------------------------------------------------------------------------
 149                                  Power Management
 150    -------------------------------------------------------------------------- */
 151
 152 int acpi_bus_get_power(acpi_handle handle, int *state)
 153 {
 154         int result = 0;
 155         acpi_status status = 0;
 156         struct acpi_device *device = NULL;
 157         unsigned long psc = 0;
 158
 159
 160         result = acpi_bus_get_device(handle, &device);
 161         if (result)
 162                 return result;
 163
 164         *state = ACPI_STATE_UNKNOWN;
 165
 166         if (!device->flags.power_manageable) {
 167                 /* TBD: Non-recursive algorithm for walking up hierarchy */
 168                 if (device->parent)
 169                         *state = device->parent->power.state;
 170                 else
 171                         *state = ACPI_STATE_D0;
 172         } else {
 173                 /*
 174                  * Get the device's power state either directly (via _PSC) or
 175                  * indirectly (via power resources).
 176                  */
 177                 if (device->power.flags.explicit_get) {
 178                         status = acpi_evaluate_integer(device->handle, "_PSC",
 179                                                        NULL, &psc);
 180                         if (ACPI_FAILURE(status))
 181                                 return -ENODEV;
 182                         device->power.state = (int)psc;
 183                 } else if (device->power.flags.power_resources) {
 184                         result = acpi_power_get_inferred_state(device);
 185                         if (result)
 186                                 return result;
 187                 }
 188
 189                 *state = device->power.state;
 190         }
 191
 192         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
 193                           device->pnp.bus_id, device->power.state));
 194
 195         return 0;
 196 }
 197
 198 EXPORT_SYMBOL(acpi_bus_get_power);
 199
 200 int acpi_bus_set_power(acpi_handle handle, int state)
 201 {
 202         int result = 0;
 203         acpi_status status = AE_OK;
 204         struct acpi_device *device = NULL;
 205         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 206
 207
 208         result = acpi_bus_get_device(handle, &device);
 209         if (result)
 210                 return result;
 211
 212         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
 213                 return -EINVAL;
 214
 215         /* Make sure this is a valid target state */
 216
 217         if (!device->flags.power_manageable) {
 218                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
 219                                 kobject_name(&device->dev.kobj)));
 220                 return -ENODEV;
 221         }
 222         /*
 223          * Get device's current power state
 224          */
 225         acpi_bus_get_power(device->handle, &device->power.state);
 226         if ((state == device->power.state) && !device->flags.force_power_state) {
 227                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
 228                                   state));
 229                 return 0;
 230         }
 231
 232         if (!device->power.states[state].flags.valid) {
 233                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
 234                 return -ENODEV;
 235         }
 236         if (device->parent && (state < device->parent->power.state)) {
 237                 printk(KERN_WARNING PREFIX
 238                               "Cannot set device to a higher-powered"
 239                               " state than parent\n");
 240                 return -ENODEV;
 241         }
 242
 243         /*
 244          * Transition Power
 245          * ----------------
 246          * On transitions to a high-powered state we first apply power (via
 247          * power resources) then evalute _PSx.  Conversly for transitions to
 248          * a lower-powered state.
 249          */
 250         if (state < device->power.state) {
 251                 if (device->power.flags.power_resources) {
 252                         result = acpi_power_transition(device, state);
 253                         if (result)
 254                                 goto end;
 255                 }
 256                 if (device->power.states[state].flags.explicit_set) {
 257                         status = acpi_evaluate_object(device->handle,
 258                                                       object_name, NULL, NULL);
 259                         if (ACPI_FAILURE(status)) {
 260                                 result = -ENODEV;
 261                                 goto end;
 262                         }
 263                 }
 264         } else {
 265                 if (device->power.states[state].flags.explicit_set) {
 266                         status = acpi_evaluate_object(device->handle,
 267                                                       object_name, NULL, NULL);
 268                         if (ACPI_FAILURE(status)) {
 269                                 result = -ENODEV;
 270                                 goto end;
 271                         }
 272                 }
 273                 if (device->power.flags.power_resources) {
 274                         result = acpi_power_transition(device, state);
 275                         if (result)
 276                                 goto end;
 277                 }
 278         }
 279
 280       end:
 281         if (result)
 282                 printk(KERN_WARNING PREFIX
 283                               "Transitioning device [%s] to D%d\n",
 284                               device->pnp.bus_id, state);
 285         else {
 286                 device->power.state = state;
 287                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 288                                   "Device [%s] transitioned to D%d\n",
 289                                   device->pnp.bus_id, state));
 290         }
 291
 292         return result;
 293 }
 294
 295 EXPORT_SYMBOL(acpi_bus_set_power);
 296
 297 /* --------------------------------------------------------------------------
 298                                 Event Management
 299    -------------------------------------------------------------------------- */
 300
 301 #ifdef CONFIG_ACPI_PROC_EVENT
 302 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 303
 304 LIST_HEAD(acpi_bus_event_list);
 305 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 306
 307 extern int event_is_open;
 308
 309 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 310 {
 311         struct acpi_bus_event *event;
 312         unsigned long flags = 0;
 313
 314         /* drop event on the floor if no one's listening */
 315         if (!event_is_open)
 316                 return 0;
 317
 318         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 319         if (!event)
 320                 return -ENOMEM;
 321
 322         strcpy(event->device_class, device_class);
 323         strcpy(event->bus_id, bus_id);
 324         event->type = type;
 325         event->data = data;
 326
 327         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 328         list_add_tail(&event->node, &acpi_bus_event_list);
 329         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 330
 331         wake_up_interruptible(&acpi_bus_event_queue);
 332
 333         return 0;
 334
 335 }
 336
 337 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 338
 339 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 340 {
 341         if (!device)
 342                 return -EINVAL;
 343         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 344                                              device->pnp.bus_id, type, data);
 345 }
 346
 347 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 348
 349 int acpi_bus_receive_event(struct acpi_bus_event *event)
 350 {
 351         unsigned long flags = 0;
 352         struct acpi_bus_event *entry = NULL;
 353
 354         DECLARE_WAITQUEUE(wait, current);
 355
 356
 357         if (!event)
 358                 return -EINVAL;
 359
 360         if (list_empty(&acpi_bus_event_list)) {
 361
 362                 set_current_state(TASK_INTERRUPTIBLE);
 363                 add_wait_queue(&acpi_bus_event_queue, &wait);
 364
 365                 if (list_empty(&acpi_bus_event_list))
 366                         schedule();
 367
 368                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 369                 set_current_state(TASK_RUNNING);
 370
 371                 if (signal_pending(current))
 372                         return -ERESTARTSYS;
 373         }
 374
 375         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 376         entry =
 377             list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node);
 378         if (entry)
 379                 list_del(&entry->node);
 380         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 381
 382         if (!entry)
 383                 return -ENODEV;
 384
 385         memcpy(event, entry, sizeof(struct acpi_bus_event));
 386
 387         kfree(entry);
 388
 389         return 0;
 390 }
 391
 392 #endif  /* CONFIG_ACPI_PROC_EVENT */
 393
 394 /* --------------------------------------------------------------------------
 395                              Notification Handling
 396    -------------------------------------------------------------------------- */
 397
 398 static int
 399 acpi_bus_check_device(struct acpi_device *device, int *status_changed)
 400 {
 401         acpi_status status = 0;
 402         struct acpi_device_status old_status;
 403
 404
 405         if (!device)
 406                 return -EINVAL;
 407
 408         if (status_changed)
 409                 *status_changed = 0;
 410
 411         old_status = device->status;
 412
 413         /*
 414          * Make sure this device's parent is present before we go about
 415          * messing with the device.
 416          */
 417         if (device->parent && !device->parent->status.present) {
 418                 device->status = device->parent->status;
 419                 if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
 420                         if (status_changed)
 421                                 *status_changed = 1;
 422                 }
 423                 return 0;
 424         }
 425
 426         status = acpi_bus_get_status(device);
 427         if (ACPI_FAILURE(status))
 428                 return -ENODEV;
 429
 430         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 431                 return 0;
 432
 433         if (status_changed)
 434                 *status_changed = 1;
 435
 436         /*
 437          * Device Insertion/Removal
 438          */
 439         if ((device->status.present) && !(old_status.present)) {
 440                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 441                 /* TBD: Handle device insertion */
 442         } else if (!(device->status.present) && (old_status.present)) {
 443                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 444                 /* TBD: Handle device removal */
 445         }
 446
 447         return 0;
 448 }
 449
 450 static int acpi_bus_check_scope(struct acpi_device *device)
 451 {
 452         int result = 0;
 453         int status_changed = 0;
 454
 455
 456         if (!device)
 457                 return -EINVAL;
 458
 459         /* Status Change? */
 460         result = acpi_bus_check_device(device, &status_changed);
 461         if (result)
 462                 return result;
 463
 464         if (!status_changed)
 465                 return 0;
 466
 467         /*
 468          * TBD: Enumerate child devices within this device's scope and
 469          *       run acpi_bus_check_device()'s on them.
 470          */
 471
 472         return 0;
 473 }
 474
 475 /**
 476  * acpi_bus_notify
 477  * ---------------
 478  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 479  */
 480 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 481 {
 482         int result = 0;
 483         struct acpi_device *device = NULL;
 484
 485
 486         if (acpi_bus_get_device(handle, &device))
 487                 return;
 488
 489         switch (type) {
 490
 491         case ACPI_NOTIFY_BUS_CHECK:
 492                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 493                                   "Received BUS CHECK notification for device [%s]\n",
 494                                   device->pnp.bus_id));
 495                 result = acpi_bus_check_scope(device);
 496                 /*
 497                  * TBD: We'll need to outsource certain events to non-ACPI
 498                  *      drivers via the device manager (device.c).
 499                  */
 500                 break;
 501
 502         case ACPI_NOTIFY_DEVICE_CHECK:
 503                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 504                                   "Received DEVICE CHECK notification for device [%s]\n",
 505                                   device->pnp.bus_id));
 506                 result = acpi_bus_check_device(device, NULL);
 507                 /*
 508                  * TBD: We'll need to outsource certain events to non-ACPI
 509                  *      drivers via the device manager (device.c).
 510                  */
 511                 break;
 512
 513         case ACPI_NOTIFY_DEVICE_WAKE:
 514                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 515                                   "Received DEVICE WAKE notification for device [%s]\n",
 516                                   device->pnp.bus_id));
 517                 /* TBD */
 518                 break;
 519
 520         case ACPI_NOTIFY_EJECT_REQUEST:
 521                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 522                                   "Received EJECT REQUEST notification for device [%s]\n",
 523                                   device->pnp.bus_id));
 524                 /* TBD */
 525                 break;
 526
 527         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 528                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 529                                   "Received DEVICE CHECK LIGHT notification for device [%s]\n",
 530                                   device->pnp.bus_id));
 531                 /* TBD: Exactly what does 'light' mean? */
 532                 break;
 533
 534         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 535                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 536                                   "Received FREQUENCY MISMATCH notification for device [%s]\n",
 537                                   device->pnp.bus_id));
 538                 /* TBD */
 539                 break;
 540
 541         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 542                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 543                                   "Received BUS MODE MISMATCH notification for device [%s]\n",
 544                                   device->pnp.bus_id));
 545                 /* TBD */
 546                 break;
 547
 548         case ACPI_NOTIFY_POWER_FAULT:
 549                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 550                                   "Received POWER FAULT notification for device [%s]\n",
 551                                   device->pnp.bus_id));
 552                 /* TBD */
 553                 break;
 554
 555         default:
 556                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 557                                   "Received unknown/unsupported notification [%08x]\n",
 558                                   type));
 559                 break;
 560         }
 561
 562         return;
 563 }
 564
 565 /* --------------------------------------------------------------------------
 566                              Initialization/Cleanup
 567    -------------------------------------------------------------------------- */
 568
 569 static int __init acpi_bus_init_irq(void)
 570 {
 571         acpi_status status = AE_OK;
 572         union acpi_object arg = { ACPI_TYPE_INTEGER };
 573         struct acpi_object_list arg_list = { 1, &arg };
 574         char *message = NULL;
 575
 576
 577         /*
 578          * Let the system know what interrupt model we are using by
 579          * evaluating the \_PIC object, if exists.
 580          */
 581
 582         switch (acpi_irq_model) {
 583         case ACPI_IRQ_MODEL_PIC:
 584                 message = "PIC";
 585                 break;
 586         case ACPI_IRQ_MODEL_IOAPIC:
 587                 message = "IOAPIC";
 588                 break;
 589         case ACPI_IRQ_MODEL_IOSAPIC:
 590                 message = "IOSAPIC";
 591                 break;
 592         case ACPI_IRQ_MODEL_PLATFORM:
 593                 message = "platform specific model";
 594                 break;
 595         default:
 596                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 597                 return -ENODEV;
 598         }
 599
 600         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 601
 602         arg.integer.value = acpi_irq_model;
 603
 604         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 605         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 606                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 607                 return -ENODEV;
 608         }
 609
 610         return 0;
 611 }
 612
 613 acpi_native_uint acpi_gbl_permanent_mmap;
 614
 615
 616 void __init acpi_early_init(void)
 617 {
 618         acpi_status status = AE_OK;
 619
 620         if (acpi_disabled)
 621                 return;
 622
 623         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 624
 625         /* enable workarounds, unless strict ACPI spec. compliance */
 626         if (!acpi_strict)
 627                 acpi_gbl_enable_interpreter_slack = TRUE;
 628
 629         acpi_gbl_permanent_mmap = 1;
 630
 631         status = acpi_reallocate_root_table();
 632         if (ACPI_FAILURE(status)) {
 633                 printk(KERN_ERR PREFIX
 634                        "Unable to reallocate ACPI tables\n");
 635                 goto error0;
 636         }
 637
 638         status = acpi_initialize_subsystem();
 639         if (ACPI_FAILURE(status)) {
 640                 printk(KERN_ERR PREFIX
 641                        "Unable to initialize the ACPI Interpreter\n");
 642                 goto error0;
 643         }
 644
 645         status = acpi_load_tables();
 646         if (ACPI_FAILURE(status)) {
 647                 printk(KERN_ERR PREFIX
 648                        "Unable to load the System Description Tables\n");
 649                 goto error0;
 650         }
 651
 652 #ifdef CONFIG_X86
 653         if (!acpi_ioapic) {
 654                 /* compatible (0) means level (3) */
 655                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 656                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 657                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 658                 }
 659                 /* Set PIC-mode SCI trigger type */
 660                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 661                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 662         } else {
 663                 /*
 664                  * now that acpi_gbl_FADT is initialized,
 665                  * update it with result from INT_SRC_OVR parsing
 666                  */
 667                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 668         }
 669 #endif
 670
 671         status =
 672             acpi_enable_subsystem(~
 673                                   (ACPI_NO_HARDWARE_INIT |
 674                                    ACPI_NO_ACPI_ENABLE));
 675         if (ACPI_FAILURE(status)) {
 676                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 677                 goto error0;
 678         }
 679
 680         return;
 681
 682       error0:
 683         disable_acpi();
 684         return;
 685 }
 686
 687 static int __init acpi_bus_init(void)
 688 {
 689         int result = 0;
 690         acpi_status status = AE_OK;
 691         extern acpi_status acpi_os_initialize1(void);
 692
 693
 694         status = acpi_os_initialize1();
 695
 696         status =
 697             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 698         if (ACPI_FAILURE(status)) {
 699                 printk(KERN_ERR PREFIX
 700                        "Unable to start the ACPI Interpreter\n");
 701                 goto error1;
 702         }
 703
 704         if (ACPI_FAILURE(status)) {
 705                 printk(KERN_ERR PREFIX
 706                        "Unable to initialize ACPI OS objects\n");
 707                 goto error1;
 708         }
 709 #ifdef CONFIG_ACPI_EC
 710         /*
 711          * ACPI 2.0 requires the EC driver to be loaded and work before
 712          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 713          * is called).
 714          *
 715          * This is accomplished by looking for the ECDT table, and getting
 716          * the EC parameters out of that.
 717          */
 718         status = acpi_ec_ecdt_probe();
 719         /* Ignore result. Not having an ECDT is not fatal. */
 720 #endif
 721
 722         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 723         if (ACPI_FAILURE(status)) {
 724                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 725                 goto error1;
 726         }
 727
 728         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 729
 730         /* Initialize sleep structures */
 731         acpi_sleep_init();
 732
 733         /*
 734          * Get the system interrupt model and evaluate \_PIC.
 735          */
 736         result = acpi_bus_init_irq();
 737         if (result)
 738                 goto error1;
 739
 740         /*
 741          * Register the for all standard device notifications.
 742          */
 743         status =
 744             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 745                                         &acpi_bus_notify, NULL);
 746         if (ACPI_FAILURE(status)) {
 747                 printk(KERN_ERR PREFIX
 748                        "Unable to register for device notifications\n");
 749                 goto error1;
 750         }
 751
 752         /*
 753          * Create the top ACPI proc directory
 754          */
 755         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 756
 757         return 0;
 758
 759         /* Mimic structured exception handling */
 760       error1:
 761         acpi_terminate();
 762         return -ENODEV;
 763 }
 764
 765 struct kobject *acpi_kobj;
 766
 767 static int __init acpi_init(void)
 768 {
 769         int result = 0;
 770
 771
 772         if (acpi_disabled) {
 773                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 774                 return -ENODEV;
 775         }
 776
 777         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
 778         if (!acpi_kobj) {
 779                 printk(KERN_WARNING "%s: kset create error\n", __FUNCTION__);
 780                 acpi_kobj = NULL;
 781         }
 782
 783         result = acpi_bus_init();
 784
 785         if (!result) {
 786                 if (!(pm_flags & PM_APM))
 787                         pm_flags |= PM_ACPI;
 788                 else {
 789                         printk(KERN_INFO PREFIX
 790                                "APM is already active, exiting\n");
 791                         disable_acpi();
 792                         result = -ENODEV;
 793                 }
 794         } else
 795                 disable_acpi();
 796
 797         return result;
 798 }
 799
 800 subsys_initcall(acpi_init);