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