err.no Git - linux-2.6/blob - 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 void acpi_bus_private_data_handler(acpi_handle handle,
 126                                    u32 function, void *context)
 127 {
 128         return;
 129 }
 130 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 131
 132 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 133 {
 134         acpi_status status = AE_OK;
 135
 136         if (!*data)
 137                 return -EINVAL;
 138
 139         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 140         if (ACPI_FAILURE(status) || !*data) {
 141                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 142                                 handle));
 143                 return -ENODEV;
 144         }
 145
 146         return 0;
 147 }
 148 EXPORT_SYMBOL(acpi_bus_get_private_data);
 149
 150 /* --------------------------------------------------------------------------
 151                                  Power Management
 152    -------------------------------------------------------------------------- */
 153
 154 int acpi_bus_get_power(acpi_handle handle, int *state)
 155 {
 156         int result = 0;
 157         acpi_status status = 0;
 158         struct acpi_device *device = NULL;
 159         unsigned long psc = 0;
 160
 161
 162         result = acpi_bus_get_device(handle, &device);
 163         if (result)
 164                 return result;
 165
 166         *state = ACPI_STATE_UNKNOWN;
 167
 168         if (!device->flags.power_manageable) {
 169                 /* TBD: Non-recursive algorithm for walking up hierarchy */
 170                 if (device->parent)
 171                         *state = device->parent->power.state;
 172                 else
 173                         *state = ACPI_STATE_D0;
 174         } else {
 175                 /*
 176                  * Get the device's power state either directly (via _PSC) or
 177                  * indirectly (via power resources).
 178                  */
 179                 if (device->power.flags.explicit_get) {
 180                         status = acpi_evaluate_integer(device->handle, "_PSC",
 181                                                        NULL, &psc);
 182                         if (ACPI_FAILURE(status))
 183                                 return -ENODEV;
 184                         device->power.state = (int)psc;
 185                 } else if (device->power.flags.power_resources) {
 186                         result = acpi_power_get_inferred_state(device);
 187                         if (result)
 188                                 return result;
 189                 }
 190
 191                 *state = device->power.state;
 192         }
 193
 194         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
 195                           device->pnp.bus_id, device->power.state));
 196
 197         return 0;
 198 }
 199
 200 EXPORT_SYMBOL(acpi_bus_get_power);
 201
 202 int acpi_bus_set_power(acpi_handle handle, int state)
 203 {
 204         int result = 0;
 205         acpi_status status = AE_OK;
 206         struct acpi_device *device = NULL;
 207         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 208
 209
 210         result = acpi_bus_get_device(handle, &device);
 211         if (result)
 212                 return result;
 213
 214         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
 215                 return -EINVAL;
 216
 217         /* Make sure this is a valid target state */
 218
 219         if (!device->flags.power_manageable) {
 220                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
 221                                 kobject_name(&device->dev.kobj)));
 222                 return -ENODEV;
 223         }
 224         /*
 225          * Get device's current power state
 226          */
 227         acpi_bus_get_power(device->handle, &device->power.state);
 228         if ((state == device->power.state) && !device->flags.force_power_state) {
 229                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
 230                                   state));
 231                 return 0;
 232         }
 233
 234         if (!device->power.states[state].flags.valid) {
 235                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
 236                 return -ENODEV;
 237         }
 238         if (device->parent && (state < device->parent->power.state)) {
 239                 printk(KERN_WARNING PREFIX
 240                               "Cannot set device to a higher-powered"
 241                               " state than parent\n");
 242                 return -ENODEV;
 243         }
 244
 245         /*
 246          * Transition Power
 247          * ----------------
 248          * On transitions to a high-powered state we first apply power (via
 249          * power resources) then evalute _PSx.  Conversly for transitions to
 250          * a lower-powered state.
 251          */
 252         if (state < device->power.state) {
 253                 if (device->power.flags.power_resources) {
 254                         result = acpi_power_transition(device, state);
 255                         if (result)
 256                                 goto end;
 257                 }
 258                 if (device->power.states[state].flags.explicit_set) {
 259                         status = acpi_evaluate_object(device->handle,
 260                                                       object_name, NULL, NULL);
 261                         if (ACPI_FAILURE(status)) {
 262                                 result = -ENODEV;
 263                                 goto end;
 264                         }
 265                 }
 266         } else {
 267                 if (device->power.states[state].flags.explicit_set) {
 268                         status = acpi_evaluate_object(device->handle,
 269                                                       object_name, NULL, NULL);
 270                         if (ACPI_FAILURE(status)) {
 271                                 result = -ENODEV;
 272                                 goto end;
 273                         }
 274                 }
 275                 if (device->power.flags.power_resources) {
 276                         result = acpi_power_transition(device, state);
 277                         if (result)
 278                                 goto end;
 279                 }
 280         }
 281
 282       end:
 283         if (result)
 284                 printk(KERN_WARNING PREFIX
 285                               "Transitioning device [%s] to D%d\n",
 286                               device->pnp.bus_id, state);
 287         else {
 288                 device->power.state = state;
 289                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 290                                   "Device [%s] transitioned to D%d\n",
 291                                   device->pnp.bus_id, state));
 292         }
 293
 294         return result;
 295 }
 296
 297 EXPORT_SYMBOL(acpi_bus_set_power);
 298
 299 /* --------------------------------------------------------------------------
 300                                 Event Management
 301    -------------------------------------------------------------------------- */
 302
 303 #ifdef CONFIG_ACPI_PROC_EVENT
 304 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 305
 306 LIST_HEAD(acpi_bus_event_list);
 307 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 308
 309 extern int event_is_open;
 310
 311 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 312 {
 313         struct acpi_bus_event *event;
 314         unsigned long flags = 0;
 315
 316         /* drop event on the floor if no one's listening */
 317         if (!event_is_open)
 318                 return 0;
 319
 320         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 321         if (!event)
 322                 return -ENOMEM;
 323
 324         strcpy(event->device_class, device_class);
 325         strcpy(event->bus_id, bus_id);
 326         event->type = type;
 327         event->data = data;
 328
 329         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 330         list_add_tail(&event->node, &acpi_bus_event_list);
 331         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 332
 333         wake_up_interruptible(&acpi_bus_event_queue);
 334
 335         return 0;
 336
 337 }
 338
 339 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 340
 341 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 342 {
 343         if (!device)
 344                 return -EINVAL;
 345         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 346                                              device->pnp.bus_id, type, data);
 347 }
 348
 349 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 350
 351 int acpi_bus_receive_event(struct acpi_bus_event *event)
 352 {
 353         unsigned long flags = 0;
 354         struct acpi_bus_event *entry = NULL;
 355
 356         DECLARE_WAITQUEUE(wait, current);
 357
 358
 359         if (!event)
 360                 return -EINVAL;
 361
 362         if (list_empty(&acpi_bus_event_list)) {
 363
 364                 set_current_state(TASK_INTERRUPTIBLE);
 365                 add_wait_queue(&acpi_bus_event_queue, &wait);
 366
 367                 if (list_empty(&acpi_bus_event_list))
 368                         schedule();
 369
 370                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 371                 set_current_state(TASK_RUNNING);
 372
 373                 if (signal_pending(current))
 374                         return -ERESTARTSYS;
 375         }
 376
 377         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 378         entry =
 379             list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node);
 380         if (entry)
 381                 list_del(&entry->node);
 382         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 383
 384         if (!entry)
 385                 return -ENODEV;
 386
 387         memcpy(event, entry, sizeof(struct acpi_bus_event));
 388
 389         kfree(entry);
 390
 391         return 0;
 392 }
 393
 394 #endif  /* CONFIG_ACPI_PROC_EVENT */
 395
 396 /* --------------------------------------------------------------------------
 397                              Notification Handling
 398    -------------------------------------------------------------------------- */
 399
 400 static int
 401 acpi_bus_check_device(struct acpi_device *device, int *status_changed)
 402 {
 403         acpi_status status = 0;
 404         struct acpi_device_status old_status;
 405
 406
 407         if (!device)
 408                 return -EINVAL;
 409
 410         if (status_changed)
 411                 *status_changed = 0;
 412
 413         old_status = device->status;
 414
 415         /*
 416          * Make sure this device's parent is present before we go about
 417          * messing with the device.
 418          */
 419         if (device->parent && !device->parent->status.present) {
 420                 device->status = device->parent->status;
 421                 if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
 422                         if (status_changed)
 423                                 *status_changed = 1;
 424                 }
 425                 return 0;
 426         }
 427
 428         status = acpi_bus_get_status(device);
 429         if (ACPI_FAILURE(status))
 430                 return -ENODEV;
 431
 432         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 433                 return 0;
 434
 435         if (status_changed)
 436                 *status_changed = 1;
 437
 438         /*
 439          * Device Insertion/Removal
 440          */
 441         if ((device->status.present) && !(old_status.present)) {
 442                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 443                 /* TBD: Handle device insertion */
 444         } else if (!(device->status.present) && (old_status.present)) {
 445                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 446                 /* TBD: Handle device removal */
 447         }
 448
 449         return 0;
 450 }
 451
 452 static int acpi_bus_check_scope(struct acpi_device *device)
 453 {
 454         int result = 0;
 455         int status_changed = 0;
 456
 457
 458         if (!device)
 459                 return -EINVAL;
 460
 461         /* Status Change? */
 462         result = acpi_bus_check_device(device, &status_changed);
 463         if (result)
 464                 return result;
 465
 466         if (!status_changed)
 467                 return 0;
 468
 469         /*
 470          * TBD: Enumerate child devices within this device's scope and
 471          *       run acpi_bus_check_device()'s on them.
 472          */
 473
 474         return 0;
 475 }
 476
 477 /**
 478  * acpi_bus_notify
 479  * ---------------
 480  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 481  */
 482 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 483 {
 484         int result = 0;
 485         struct acpi_device *device = NULL;
 486
 487
 488         if (acpi_bus_get_device(handle, &device))
 489                 return;
 490
 491         switch (type) {
 492
 493         case ACPI_NOTIFY_BUS_CHECK:
 494                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 495                                   "Received BUS CHECK notification for device [%s]\n",
 496                                   device->pnp.bus_id));
 497                 result = acpi_bus_check_scope(device);
 498                 /*
 499                  * TBD: We'll need to outsource certain events to non-ACPI
 500                  *      drivers via the device manager (device.c).
 501                  */
 502                 break;
 503
 504         case ACPI_NOTIFY_DEVICE_CHECK:
 505                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 506                                   "Received DEVICE CHECK notification for device [%s]\n",
 507                                   device->pnp.bus_id));
 508                 result = acpi_bus_check_device(device, NULL);
 509                 /*
 510                  * TBD: We'll need to outsource certain events to non-ACPI
 511                  *      drivers via the device manager (device.c).
 512                  */
 513                 break;
 514
 515         case ACPI_NOTIFY_DEVICE_WAKE:
 516                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 517                                   "Received DEVICE WAKE notification for device [%s]\n",
 518                                   device->pnp.bus_id));
 519                 /* TBD */
 520                 break;
 521
 522         case ACPI_NOTIFY_EJECT_REQUEST:
 523                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 524                                   "Received EJECT REQUEST notification for device [%s]\n",
 525                                   device->pnp.bus_id));
 526                 /* TBD */
 527                 break;
 528
 529         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 530                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 531                                   "Received DEVICE CHECK LIGHT notification for device [%s]\n",
 532                                   device->pnp.bus_id));
 533                 /* TBD: Exactly what does 'light' mean? */
 534                 break;
 535
 536         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 537                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 538                                   "Received FREQUENCY MISMATCH notification for device [%s]\n",
 539                                   device->pnp.bus_id));
 540                 /* TBD */
 541                 break;
 542
 543         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 544                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 545                                   "Received BUS MODE MISMATCH notification for device [%s]\n",
 546                                   device->pnp.bus_id));
 547                 /* TBD */
 548                 break;
 549
 550         case ACPI_NOTIFY_POWER_FAULT:
 551                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 552                                   "Received POWER FAULT notification for device [%s]\n",
 553                                   device->pnp.bus_id));
 554                 /* TBD */
 555                 break;
 556
 557         default:
 558                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 559                                   "Received unknown/unsupported notification [%08x]\n",
 560                                   type));
 561                 break;
 562         }
 563
 564         return;
 565 }
 566
 567 /* --------------------------------------------------------------------------
 568                              Initialization/Cleanup
 569    -------------------------------------------------------------------------- */
 570
 571 static int __init acpi_bus_init_irq(void)
 572 {
 573         acpi_status status = AE_OK;
 574         union acpi_object arg = { ACPI_TYPE_INTEGER };
 575         struct acpi_object_list arg_list = { 1, &arg };
 576         char *message = NULL;
 577
 578
 579         /*
 580          * Let the system know what interrupt model we are using by
 581          * evaluating the \_PIC object, if exists.
 582          */
 583
 584         switch (acpi_irq_model) {
 585         case ACPI_IRQ_MODEL_PIC:
 586                 message = "PIC";
 587                 break;
 588         case ACPI_IRQ_MODEL_IOAPIC:
 589                 message = "IOAPIC";
 590                 break;
 591         case ACPI_IRQ_MODEL_IOSAPIC:
 592                 message = "IOSAPIC";
 593                 break;
 594         case ACPI_IRQ_MODEL_PLATFORM:
 595                 message = "platform specific model";
 596                 break;
 597         default:
 598                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 599                 return -ENODEV;
 600         }
 601
 602         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 603
 604         arg.integer.value = acpi_irq_model;
 605
 606         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 607         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 608                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 609                 return -ENODEV;
 610         }
 611
 612         return 0;
 613 }
 614
 615 acpi_native_uint acpi_gbl_permanent_mmap;
 616
 617
 618 void __init acpi_early_init(void)
 619 {
 620         acpi_status status = AE_OK;
 621
 622         if (acpi_disabled)
 623                 return;
 624
 625         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 626
 627         /* enable workarounds, unless strict ACPI spec. compliance */
 628         if (!acpi_strict)
 629                 acpi_gbl_enable_interpreter_slack = TRUE;
 630
 631         acpi_gbl_permanent_mmap = 1;
 632
 633         status = acpi_reallocate_root_table();
 634         if (ACPI_FAILURE(status)) {
 635                 printk(KERN_ERR PREFIX
 636                        "Unable to reallocate ACPI tables\n");
 637                 goto error0;
 638         }
 639
 640         status = acpi_initialize_subsystem();
 641         if (ACPI_FAILURE(status)) {
 642                 printk(KERN_ERR PREFIX
 643                        "Unable to initialize the ACPI Interpreter\n");
 644                 goto error0;
 645         }
 646
 647         status = acpi_load_tables();
 648         if (ACPI_FAILURE(status)) {
 649                 printk(KERN_ERR PREFIX
 650                        "Unable to load the System Description Tables\n");
 651                 goto error0;
 652         }
 653
 654 #ifdef CONFIG_X86
 655         if (!acpi_ioapic) {
 656                 extern u8 acpi_sci_flags;
 657
 658                 /* compatible (0) means level (3) */
 659                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 660                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 661                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 662                 }
 663                 /* Set PIC-mode SCI trigger type */
 664                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 665                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 666         } else {
 667                 extern int acpi_sci_override_gsi;
 668                 /*
 669                  * now that acpi_gbl_FADT is initialized,
 670                  * update it with result from INT_SRC_OVR parsing
 671                  */
 672                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 673         }
 674 #endif
 675
 676         status =
 677             acpi_enable_subsystem(~
 678                                   (ACPI_NO_HARDWARE_INIT |
 679                                    ACPI_NO_ACPI_ENABLE));
 680         if (ACPI_FAILURE(status)) {
 681                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 682                 goto error0;
 683         }
 684
 685         return;
 686
 687       error0:
 688         disable_acpi();
 689         return;
 690 }
 691
 692 static int __init acpi_bus_init(void)
 693 {
 694         int result = 0;
 695         acpi_status status = AE_OK;
 696         extern acpi_status acpi_os_initialize1(void);
 697
 698
 699         status = acpi_os_initialize1();
 700
 701         status =
 702             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 703         if (ACPI_FAILURE(status)) {
 704                 printk(KERN_ERR PREFIX
 705                        "Unable to start the ACPI Interpreter\n");
 706                 goto error1;
 707         }
 708
 709         if (ACPI_FAILURE(status)) {
 710                 printk(KERN_ERR PREFIX
 711                        "Unable to initialize ACPI OS objects\n");
 712                 goto error1;
 713         }
 714 #ifdef CONFIG_ACPI_EC
 715         /*
 716          * ACPI 2.0 requires the EC driver to be loaded and work before
 717          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 718          * is called).
 719          *
 720          * This is accomplished by looking for the ECDT table, and getting
 721          * the EC parameters out of that.
 722          */
 723         status = acpi_ec_ecdt_probe();
 724         /* Ignore result. Not having an ECDT is not fatal. */
 725 #endif
 726
 727         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 728         if (ACPI_FAILURE(status)) {
 729                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 730                 goto error1;
 731         }
 732
 733         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 734
 735         /* Initialize sleep structures */
 736         acpi_sleep_init();
 737
 738         /*
 739          * Get the system interrupt model and evaluate \_PIC.
 740          */
 741         result = acpi_bus_init_irq();
 742         if (result)
 743                 goto error1;
 744
 745         /*
 746          * Register the for all standard device notifications.
 747          */
 748         status =
 749             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 750                                         &acpi_bus_notify, NULL);
 751         if (ACPI_FAILURE(status)) {
 752                 printk(KERN_ERR PREFIX
 753                        "Unable to register for device notifications\n");
 754                 goto error1;
 755         }
 756
 757         /*
 758          * Create the top ACPI proc directory
 759          */
 760         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 761
 762         return 0;
 763
 764         /* Mimic structured exception handling */
 765       error1:
 766         acpi_terminate();
 767         return -ENODEV;
 768 }
 769
 770 struct kobject *acpi_kobj;
 771
 772 static int __init acpi_init(void)
 773 {
 774         int result = 0;
 775
 776
 777         if (acpi_disabled) {
 778                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 779                 return -ENODEV;
 780         }
 781
 782         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
 783         if (!acpi_kobj) {
 784                 printk(KERN_WARNING "%s: kset create error\n", __FUNCTION__);
 785                 acpi_kobj = NULL;
 786         }
 787
 788         result = acpi_bus_init();
 789
 790         if (!result) {
 791                 if (!(pm_flags & PM_APM))
 792                         pm_flags |= PM_ACPI;
 793                 else {
 794                         printk(KERN_INFO PREFIX
 795                                "APM is already active, exiting\n");
 796                         disable_acpi();
 797                         result = -ENODEV;
 798                 }
 799         } else
 800                 disable_acpi();
 801
 802         return result;
 803 }
 804
 805 subsys_initcall(acpi_init);