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