drivers/acpi/bus.c

   1 /*
   2  *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   5  *
   6  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or (at
  11  *  your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful, but
  14  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *  General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License along
  19  *  with this program; if not, write to the Free Software Foundation, Inc.,
  20  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  21  *
  22  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/ioport.h>
  28 #include <linux/kernel.h>
  29 #include <linux/list.h>
  30 #include <linux/sched.h>
  31 #include <linux/pm.h>
  32 #include <linux/pm_legacy.h>
  33 #include <linux/device.h>
  34 #include <linux/proc_fs.h>
  35 #ifdef CONFIG_X86
  36 #include <asm/mpspec.h>
  37 #endif
  38 #include <acpi/acpi_bus.h>
  39 #include <acpi/acpi_drivers.h>
  40
  41 #define _COMPONENT              ACPI_BUS_COMPONENT
  42 ACPI_MODULE_NAME("acpi_bus")
  43 #ifdef  CONFIG_X86
  44 extern void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger);
  45 #endif
  46
  47 struct acpi_device *acpi_root;
  48 struct proc_dir_entry *acpi_root_dir;
  49 EXPORT_SYMBOL(acpi_root_dir);
  50
  51 #define STRUCT_TO_INT(s)        (*((int*)&s))
  52
  53 /* --------------------------------------------------------------------------
  54                                 Device Management
  55    -------------------------------------------------------------------------- */
  56
  57 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
  58 {
  59         acpi_status status = AE_OK;
  60
  61
  62         if (!device)
  63                 return -EINVAL;
  64
  65         /* TBD: Support fixed-feature devices */
  66
  67         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
  68         if (ACPI_FAILURE(status) || !*device) {
  69                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
  70                                   handle));
  71                 return -ENODEV;
  72         }
  73
  74         return 0;
  75 }
  76
  77 EXPORT_SYMBOL(acpi_bus_get_device);
  78
  79 int acpi_bus_get_status(struct acpi_device *device)
  80 {
  81         acpi_status status = AE_OK;
  82         unsigned long sta = 0;
  83
  84
  85         if (!device)
  86                 return -EINVAL;
  87
  88         /*
  89          * Evaluate _STA if present.
  90          */
  91         if (device->flags.dynamic_status) {
  92                 status =
  93                     acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
  94                 if (ACPI_FAILURE(status))
  95                         return -ENODEV;
  96                 STRUCT_TO_INT(device->status) = (int)sta;
  97         }
  98
  99         /*
 100          * Otherwise we assume the status of our parent (unless we don't
 101          * have one, in which case status is implied).
 102          */
 103         else if (device->parent)
 104                 device->status = device->parent->status;
 105         else
 106                 STRUCT_TO_INT(device->status) = 0x0F;
 107
 108         if (device->status.functional && !device->status.present) {
 109                 printk(KERN_WARNING PREFIX "Device [%s] status [%08x]: "
 110                        "functional but not present; setting present\n",
 111                        device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status));
 112                 device->status.present = 1;
 113         }
 114
 115         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 116                           device->pnp.bus_id,
 117                           (u32) STRUCT_TO_INT(device->status)));
 118
 119         return 0;
 120 }
 121
 122 EXPORT_SYMBOL(acpi_bus_get_status);
 123
 124 /* --------------------------------------------------------------------------
 125                                  Power Management
 126    -------------------------------------------------------------------------- */
 127
 128 int acpi_bus_get_power(acpi_handle handle, int *state)
 129 {
 130         int result = 0;
 131         acpi_status status = 0;
 132         struct acpi_device *device = NULL;
 133         unsigned long psc = 0;
 134
 135
 136         result = acpi_bus_get_device(handle, &device);
 137         if (result)
 138                 return result;
 139
 140         *state = ACPI_STATE_UNKNOWN;
 141
 142         if (!device->flags.power_manageable) {
 143                 /* TBD: Non-recursive algorithm for walking up hierarchy */
 144                 if (device->parent)
 145                         *state = device->parent->power.state;
 146                 else
 147                         *state = ACPI_STATE_D0;
 148         } else {
 149                 /*
 150                  * Get the device's power state either directly (via _PSC) or
 151                  * indirectly (via power resources).
 152                  */
 153                 if (device->power.flags.explicit_get) {
 154                         status = acpi_evaluate_integer(device->handle, "_PSC",
 155                                                        NULL, &psc);
 156                         if (ACPI_FAILURE(status))
 157                                 return -ENODEV;
 158                         device->power.state = (int)psc;
 159                 } else if (device->power.flags.power_resources) {
 160                         result = acpi_power_get_inferred_state(device);
 161                         if (result)
 162                                 return result;
 163                 }
 164
 165                 *state = device->power.state;
 166         }
 167
 168         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
 169                           device->pnp.bus_id, device->power.state));
 170
 171         return 0;
 172 }
 173
 174 EXPORT_SYMBOL(acpi_bus_get_power);
 175
 176 int acpi_bus_set_power(acpi_handle handle, int state)
 177 {
 178         int result = 0;
 179         acpi_status status = AE_OK;
 180         struct acpi_device *device = NULL;
 181         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 182
 183
 184         result = acpi_bus_get_device(handle, &device);
 185         if (result)
 186                 return result;
 187
 188         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
 189                 return -EINVAL;
 190
 191         /* Make sure this is a valid target state */
 192
 193         if (!device->flags.power_manageable) {
 194                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
 195                                 device->dev.kobj.name));
 196                 return -ENODEV;
 197         }
 198         /*
 199          * Get device's current power state if it's unknown
 200          * This means device power state isn't initialized or previous setting failed
 201          */
 202         if ((device->power.state == ACPI_STATE_UNKNOWN) || device->flags.force_power_state)
 203                 acpi_bus_get_power(device->handle, &device->power.state);
 204         if ((state == device->power.state) && !device->flags.force_power_state) {
 205                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
 206                                   state));
 207                 return 0;
 208         }
 209
 210         if (!device->power.states[state].flags.valid) {
 211                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
 212                 return -ENODEV;
 213         }
 214         if (device->parent && (state < device->parent->power.state)) {
 215                 printk(KERN_WARNING PREFIX
 216                               "Cannot set device to a higher-powered"
 217                               " state than parent\n");
 218                 return -ENODEV;
 219         }
 220
 221         /*
 222          * Transition Power
 223          * ----------------
 224          * On transitions to a high-powered state we first apply power (via
 225          * power resources) then evalute _PSx.  Conversly for transitions to
 226          * a lower-powered state.
 227          */
 228         if (state < device->power.state) {
 229                 if (device->power.flags.power_resources) {
 230                         result = acpi_power_transition(device, state);
 231                         if (result)
 232                                 goto end;
 233                 }
 234                 if (device->power.states[state].flags.explicit_set) {
 235                         status = acpi_evaluate_object(device->handle,
 236                                                       object_name, NULL, NULL);
 237                         if (ACPI_FAILURE(status)) {
 238                                 result = -ENODEV;
 239                                 goto end;
 240                         }
 241                 }
 242         } else {
 243                 if (device->power.states[state].flags.explicit_set) {
 244                         status = acpi_evaluate_object(device->handle,
 245                                                       object_name, NULL, NULL);
 246                         if (ACPI_FAILURE(status)) {
 247                                 result = -ENODEV;
 248                                 goto end;
 249                         }
 250                 }
 251                 if (device->power.flags.power_resources) {
 252                         result = acpi_power_transition(device, state);
 253                         if (result)
 254                                 goto end;
 255                 }
 256         }
 257
 258       end:
 259         if (result)
 260                 printk(KERN_WARNING PREFIX
 261                               "Transitioning device [%s] to D%d\n",
 262                               device->pnp.bus_id, state);
 263         else
 264                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 265                                   "Device [%s] transitioned to D%d\n",
 266                                   device->pnp.bus_id, state));
 267
 268         return result;
 269 }
 270
 271 EXPORT_SYMBOL(acpi_bus_set_power);
 272
 273 /* --------------------------------------------------------------------------
 274                                 Event Management
 275    -------------------------------------------------------------------------- */
 276
 277 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 278
 279 LIST_HEAD(acpi_bus_event_list);
 280 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 281
 282 extern int event_is_open;
 283
 284 int acpi_bus_generate_event(struct acpi_device *device, u8 type, int data)
 285 {
 286         struct acpi_bus_event *event = NULL;
 287         unsigned long flags = 0;
 288
 289
 290         if (!device)
 291                 return -EINVAL;
 292
 293         /* drop event on the floor if no one's listening */
 294         if (!event_is_open)
 295                 return 0;
 296
 297         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 298         if (!event)
 299                 return -ENOMEM;
 300
 301         strcpy(event->device_class, device->pnp.device_class);
 302         strcpy(event->bus_id, device->pnp.bus_id);
 303         event->type = type;
 304         event->data = data;
 305
 306         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 307         list_add_tail(&event->node, &acpi_bus_event_list);
 308         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 309
 310         wake_up_interruptible(&acpi_bus_event_queue);
 311
 312         return 0;
 313 }
 314
 315 EXPORT_SYMBOL(acpi_bus_generate_event);
 316
 317 int acpi_bus_receive_event(struct acpi_bus_event *event)
 318 {
 319         unsigned long flags = 0;
 320         struct acpi_bus_event *entry = NULL;
 321
 322         DECLARE_WAITQUEUE(wait, current);
 323
 324
 325         if (!event)
 326                 return -EINVAL;
 327
 328         if (list_empty(&acpi_bus_event_list)) {
 329
 330                 set_current_state(TASK_INTERRUPTIBLE);
 331                 add_wait_queue(&acpi_bus_event_queue, &wait);
 332
 333                 if (list_empty(&acpi_bus_event_list))
 334                         schedule();
 335
 336                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 337                 set_current_state(TASK_RUNNING);
 338
 339                 if (signal_pending(current))
 340                         return -ERESTARTSYS;
 341         }
 342
 343         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 344         entry =
 345             list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node);
 346         if (entry)
 347                 list_del(&entry->node);
 348         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 349
 350         if (!entry)
 351                 return -ENODEV;
 352
 353         memcpy(event, entry, sizeof(struct acpi_bus_event));
 354
 355         kfree(entry);
 356
 357         return 0;
 358 }
 359
 360 EXPORT_SYMBOL(acpi_bus_receive_event);
 361
 362 /* --------------------------------------------------------------------------
 363                              Notification Handling
 364    -------------------------------------------------------------------------- */
 365
 366 static int
 367 acpi_bus_check_device(struct acpi_device *device, int *status_changed)
 368 {
 369         acpi_status status = 0;
 370         struct acpi_device_status old_status;
 371
 372
 373         if (!device)
 374                 return -EINVAL;
 375
 376         if (status_changed)
 377                 *status_changed = 0;
 378
 379         old_status = device->status;
 380
 381         /*
 382          * Make sure this device's parent is present before we go about
 383          * messing with the device.
 384          */
 385         if (device->parent && !device->parent->status.present) {
 386                 device->status = device->parent->status;
 387                 if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
 388                         if (status_changed)
 389                                 *status_changed = 1;
 390                 }
 391                 return 0;
 392         }
 393
 394         status = acpi_bus_get_status(device);
 395         if (ACPI_FAILURE(status))
 396                 return -ENODEV;
 397
 398         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 399                 return 0;
 400
 401         if (status_changed)
 402                 *status_changed = 1;
 403
 404         /*
 405          * Device Insertion/Removal
 406          */
 407         if ((device->status.present) && !(old_status.present)) {
 408                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 409                 /* TBD: Handle device insertion */
 410         } else if (!(device->status.present) && (old_status.present)) {
 411                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 412                 /* TBD: Handle device removal */
 413         }
 414
 415         return 0;
 416 }
 417
 418 static int acpi_bus_check_scope(struct acpi_device *device)
 419 {
 420         int result = 0;
 421         int status_changed = 0;
 422
 423
 424         if (!device)
 425                 return -EINVAL;
 426
 427         /* Status Change? */
 428         result = acpi_bus_check_device(device, &status_changed);
 429         if (result)
 430                 return result;
 431
 432         if (!status_changed)
 433                 return 0;
 434
 435         /*
 436          * TBD: Enumerate child devices within this device's scope and
 437          *       run acpi_bus_check_device()'s on them.
 438          */
 439
 440         return 0;
 441 }
 442
 443 /**
 444  * acpi_bus_notify
 445  * ---------------
 446  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 447  */
 448 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 449 {
 450         int result = 0;
 451         struct acpi_device *device = NULL;
 452
 453
 454         if (acpi_bus_get_device(handle, &device))
 455                 return;
 456
 457         switch (type) {
 458
 459         case ACPI_NOTIFY_BUS_CHECK:
 460                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 461                                   "Received BUS CHECK notification for device [%s]\n",
 462                                   device->pnp.bus_id));
 463                 result = acpi_bus_check_scope(device);
 464                 /*
 465                  * TBD: We'll need to outsource certain events to non-ACPI
 466                  *      drivers via the device manager (device.c).
 467                  */
 468                 break;
 469
 470         case ACPI_NOTIFY_DEVICE_CHECK:
 471                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 472                                   "Received DEVICE CHECK notification for device [%s]\n",
 473                                   device->pnp.bus_id));
 474                 result = acpi_bus_check_device(device, NULL);
 475                 /*
 476                  * TBD: We'll need to outsource certain events to non-ACPI
 477                  *      drivers via the device manager (device.c).
 478                  */
 479                 break;
 480
 481         case ACPI_NOTIFY_DEVICE_WAKE:
 482                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 483                                   "Received DEVICE WAKE notification for device [%s]\n",
 484                                   device->pnp.bus_id));
 485                 /* TBD */
 486                 break;
 487
 488         case ACPI_NOTIFY_EJECT_REQUEST:
 489                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 490                                   "Received EJECT REQUEST notification for device [%s]\n",
 491                                   device->pnp.bus_id));
 492                 /* TBD */
 493                 break;
 494
 495         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 496                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 497                                   "Received DEVICE CHECK LIGHT notification for device [%s]\n",
 498                                   device->pnp.bus_id));
 499                 /* TBD: Exactly what does 'light' mean? */
 500                 break;
 501
 502         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 503                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 504                                   "Received FREQUENCY MISMATCH notification for device [%s]\n",
 505                                   device->pnp.bus_id));
 506                 /* TBD */
 507                 break;
 508
 509         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 510                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 511                                   "Received BUS MODE MISMATCH notification for device [%s]\n",
 512                                   device->pnp.bus_id));
 513                 /* TBD */
 514                 break;
 515
 516         case ACPI_NOTIFY_POWER_FAULT:
 517                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 518                                   "Received POWER FAULT notification for device [%s]\n",
 519                                   device->pnp.bus_id));
 520                 /* TBD */
 521                 break;
 522
 523         default:
 524                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 525                                   "Received unknown/unsupported notification [%08x]\n",
 526                                   type));
 527                 break;
 528         }
 529
 530         return;
 531 }
 532
 533 /* --------------------------------------------------------------------------
 534                              Initialization/Cleanup
 535    -------------------------------------------------------------------------- */
 536
 537 static int __init acpi_bus_init_irq(void)
 538 {
 539         acpi_status status = AE_OK;
 540         union acpi_object arg = { ACPI_TYPE_INTEGER };
 541         struct acpi_object_list arg_list = { 1, &arg };
 542         char *message = NULL;
 543
 544
 545         /*
 546          * Let the system know what interrupt model we are using by
 547          * evaluating the \_PIC object, if exists.
 548          */
 549
 550         switch (acpi_irq_model) {
 551         case ACPI_IRQ_MODEL_PIC:
 552                 message = "PIC";
 553                 break;
 554         case ACPI_IRQ_MODEL_IOAPIC:
 555                 message = "IOAPIC";
 556                 break;
 557         case ACPI_IRQ_MODEL_IOSAPIC:
 558                 message = "IOSAPIC";
 559                 break;
 560         case ACPI_IRQ_MODEL_PLATFORM:
 561                 message = "platform specific model";
 562                 break;
 563         default:
 564                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 565                 return -ENODEV;
 566         }
 567
 568         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 569
 570         arg.integer.value = acpi_irq_model;
 571
 572         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 573         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 574                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 575                 return -ENODEV;
 576         }
 577
 578         return 0;
 579 }
 580
 581 acpi_native_uint acpi_gbl_permanent_mmap;
 582
 583
 584 void __init acpi_early_init(void)
 585 {
 586         acpi_status status = AE_OK;
 587
 588         if (acpi_disabled)
 589                 return;
 590
 591         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 592
 593         /* enable workarounds, unless strict ACPI spec. compliance */
 594         if (!acpi_strict)
 595                 acpi_gbl_enable_interpreter_slack = TRUE;
 596
 597         acpi_gbl_permanent_mmap = 1;
 598
 599         status = acpi_reallocate_root_table();
 600         if (ACPI_FAILURE(status)) {
 601                 printk(KERN_ERR PREFIX
 602                        "Unable to reallocate ACPI tables\n");
 603                 goto error0;
 604         }
 605
 606         status = acpi_initialize_subsystem();
 607         if (ACPI_FAILURE(status)) {
 608                 printk(KERN_ERR PREFIX
 609                        "Unable to initialize the ACPI Interpreter\n");
 610                 goto error0;
 611         }
 612
 613         status = acpi_load_tables();
 614         if (ACPI_FAILURE(status)) {
 615                 printk(KERN_ERR PREFIX
 616                        "Unable to load the System Description Tables\n");
 617                 goto error0;
 618         }
 619
 620 #ifdef CONFIG_X86
 621         if (!acpi_ioapic) {
 622                 extern u8 acpi_sci_flags;
 623
 624                 /* compatible (0) means level (3) */
 625                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 626                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 627                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 628                 }
 629                 /* Set PIC-mode SCI trigger type */
 630                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 631                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 632         } else {
 633                 extern int acpi_sci_override_gsi;
 634                 /*
 635                  * now that acpi_gbl_FADT is initialized,
 636                  * update it with result from INT_SRC_OVR parsing
 637                  */
 638                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 639         }
 640 #endif
 641
 642         status =
 643             acpi_enable_subsystem(~
 644                                   (ACPI_NO_HARDWARE_INIT |
 645                                    ACPI_NO_ACPI_ENABLE));
 646         if (ACPI_FAILURE(status)) {
 647                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 648                 goto error0;
 649         }
 650
 651         return;
 652
 653       error0:
 654         disable_acpi();
 655         return;
 656 }
 657
 658 static int __init acpi_bus_init(void)
 659 {
 660         int result = 0;
 661         acpi_status status = AE_OK;
 662         extern acpi_status acpi_os_initialize1(void);
 663
 664
 665         status = acpi_os_initialize1();
 666
 667         status =
 668             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 669         if (ACPI_FAILURE(status)) {
 670                 printk(KERN_ERR PREFIX
 671                        "Unable to start the ACPI Interpreter\n");
 672                 goto error1;
 673         }
 674
 675         if (ACPI_FAILURE(status)) {
 676                 printk(KERN_ERR PREFIX
 677                        "Unable to initialize ACPI OS objects\n");
 678                 goto error1;
 679         }
 680 #ifdef CONFIG_ACPI_EC
 681         /*
 682          * ACPI 2.0 requires the EC driver to be loaded and work before
 683          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 684          * is called).
 685          *
 686          * This is accomplished by looking for the ECDT table, and getting
 687          * the EC parameters out of that.
 688          */
 689         status = acpi_ec_ecdt_probe();
 690         /* Ignore result. Not having an ECDT is not fatal. */
 691 #endif
 692
 693         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 694         if (ACPI_FAILURE(status)) {
 695                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 696                 goto error1;
 697         }
 698
 699         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 700
 701         /*
 702          * Get the system interrupt model and evaluate \_PIC.
 703          */
 704         result = acpi_bus_init_irq();
 705         if (result)
 706                 goto error1;
 707
 708         /*
 709          * Register the for all standard device notifications.
 710          */
 711         status =
 712             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 713                                         &acpi_bus_notify, NULL);
 714         if (ACPI_FAILURE(status)) {
 715                 printk(KERN_ERR PREFIX
 716                        "Unable to register for device notifications\n");
 717                 goto error1;
 718         }
 719
 720         /*
 721          * Create the top ACPI proc directory
 722          */
 723         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 724
 725         return 0;
 726
 727         /* Mimic structured exception handling */
 728       error1:
 729         acpi_terminate();
 730         return -ENODEV;
 731 }
 732
 733 decl_subsys(acpi, NULL, NULL);
 734
 735 static int __init acpi_init(void)
 736 {
 737         int result = 0;
 738
 739
 740         if (acpi_disabled) {
 741                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 742                 return -ENODEV;
 743         }
 744
 745         result = firmware_register(&acpi_subsys);
 746         if (result < 0)
 747                 printk(KERN_WARNING "%s: firmware_register error: %d\n",
 748                         __FUNCTION__, result);
 749
 750         result = acpi_bus_init();
 751
 752         if (!result) {
 753 #ifdef CONFIG_PM_LEGACY
 754                 if (!PM_IS_ACTIVE())
 755                         pm_active = 1;
 756                 else {
 757                         printk(KERN_INFO PREFIX
 758                                "APM is already active, exiting\n");
 759                         disable_acpi();
 760                         result = -ENODEV;
 761                 }
 762 #endif
 763         } else
 764                 disable_acpi();
 765
 766         return result;
 767 }
 768
 769 subsys_initcall(acpi_init);