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   1 /*
   2  *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   5  *
   6  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or (at
  11  *  your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful, but
  14  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *  General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License along
  19  *  with this program; if not, write to the Free Software Foundation, Inc.,
  20  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  21  *
  22  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/ioport.h>
  28 #include <linux/kernel.h>
  29 #include <linux/list.h>
  30 #include <linux/sched.h>
  31 #include <linux/pm.h>
  32 #include <linux/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                                 device->dev.kobj.name));
 198                 return -ENODEV;
 199         }
 200         /*
 201          * Get device's current power state if it's unknown
 202          * This means device power state isn't initialized or previous setting failed
 203          */
 204         if ((device->power.state == ACPI_STATE_UNKNOWN) || device->flags.force_power_state)
 205                 acpi_bus_get_power(device->handle, &device->power.state);
 206         if ((state == device->power.state) && !device->flags.force_power_state) {
 207                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
 208                                   state));
 209                 return 0;
 210         }
 211
 212         if (!device->power.states[state].flags.valid) {
 213                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
 214                 return -ENODEV;
 215         }
 216         if (device->parent && (state < device->parent->power.state)) {
 217                 printk(KERN_WARNING PREFIX
 218                               "Cannot set device to a higher-powered"
 219                               " state than parent\n");
 220                 return -ENODEV;
 221         }
 222
 223         /*
 224          * Transition Power
 225          * ----------------
 226          * On transitions to a high-powered state we first apply power (via
 227          * power resources) then evalute _PSx.  Conversly for transitions to
 228          * a lower-powered state.
 229          */
 230         if (state < device->power.state) {
 231                 if (device->power.flags.power_resources) {
 232                         result = acpi_power_transition(device, state);
 233                         if (result)
 234                                 goto end;
 235                 }
 236                 if (device->power.states[state].flags.explicit_set) {
 237                         status = acpi_evaluate_object(device->handle,
 238                                                       object_name, NULL, NULL);
 239                         if (ACPI_FAILURE(status)) {
 240                                 result = -ENODEV;
 241                                 goto end;
 242                         }
 243                 }
 244         } else {
 245                 if (device->power.states[state].flags.explicit_set) {
 246                         status = acpi_evaluate_object(device->handle,
 247                                                       object_name, NULL, NULL);
 248                         if (ACPI_FAILURE(status)) {
 249                                 result = -ENODEV;
 250                                 goto end;
 251                         }
 252                 }
 253                 if (device->power.flags.power_resources) {
 254                         result = acpi_power_transition(device, state);
 255                         if (result)
 256                                 goto end;
 257                 }
 258         }
 259
 260       end:
 261         if (result)
 262                 printk(KERN_WARNING PREFIX
 263                               "Transitioning device [%s] to D%d\n",
 264                               device->pnp.bus_id, state);
 265         else {
 266                 device->power.state = state;
 267                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 268                                   "Device [%s] transitioned to D%d\n",
 269                                   device->pnp.bus_id, state));
 270         }
 271
 272         return result;
 273 }
 274
 275 EXPORT_SYMBOL(acpi_bus_set_power);
 276
 277 /* --------------------------------------------------------------------------
 278                                 Event Management
 279    -------------------------------------------------------------------------- */
 280
 281 #ifdef CONFIG_ACPI_PROC_EVENT
 282 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 283
 284 LIST_HEAD(acpi_bus_event_list);
 285 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 286
 287 extern int event_is_open;
 288
 289 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 290 {
 291         struct acpi_bus_event *event = NULL;
 292         unsigned long flags = 0;
 293
 294
 295         if (!device)
 296                 return -EINVAL;
 297
 298         /* drop event on the floor if no one's listening */
 299         if (!event_is_open)
 300                 return 0;
 301
 302         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 303         if (!event)
 304                 return -ENOMEM;
 305
 306         strcpy(event->device_class, device->pnp.device_class);
 307         strcpy(event->bus_id, device->pnp.bus_id);
 308         event->type = type;
 309         event->data = data;
 310
 311         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 312         list_add_tail(&event->node, &acpi_bus_event_list);
 313         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 314
 315         wake_up_interruptible(&acpi_bus_event_queue);
 316
 317         return 0;
 318 }
 319
 320 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 321
 322 int acpi_bus_receive_event(struct acpi_bus_event *event)
 323 {
 324         unsigned long flags = 0;
 325         struct acpi_bus_event *entry = NULL;
 326
 327         DECLARE_WAITQUEUE(wait, current);
 328
 329
 330         if (!event)
 331                 return -EINVAL;
 332
 333         if (list_empty(&acpi_bus_event_list)) {
 334
 335                 set_current_state(TASK_INTERRUPTIBLE);
 336                 add_wait_queue(&acpi_bus_event_queue, &wait);
 337
 338                 if (list_empty(&acpi_bus_event_list))
 339                         schedule();
 340
 341                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 342                 set_current_state(TASK_RUNNING);
 343
 344                 if (signal_pending(current))
 345                         return -ERESTARTSYS;
 346         }
 347
 348         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 349         entry =
 350             list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node);
 351         if (entry)
 352                 list_del(&entry->node);
 353         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 354
 355         if (!entry)
 356                 return -ENODEV;
 357
 358         memcpy(event, entry, sizeof(struct acpi_bus_event));
 359
 360         kfree(entry);
 361
 362         return 0;
 363 }
 364
 365 EXPORT_SYMBOL(acpi_bus_receive_event);
 366 #endif  /* CONFIG_ACPI_PROC_EVENT */
 367
 368 /* --------------------------------------------------------------------------
 369                              Notification Handling
 370    -------------------------------------------------------------------------- */
 371
 372 static int
 373 acpi_bus_check_device(struct acpi_device *device, int *status_changed)
 374 {
 375         acpi_status status = 0;
 376         struct acpi_device_status old_status;
 377
 378
 379         if (!device)
 380                 return -EINVAL;
 381
 382         if (status_changed)
 383                 *status_changed = 0;
 384
 385         old_status = device->status;
 386
 387         /*
 388          * Make sure this device's parent is present before we go about
 389          * messing with the device.
 390          */
 391         if (device->parent && !device->parent->status.present) {
 392                 device->status = device->parent->status;
 393                 if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
 394                         if (status_changed)
 395                                 *status_changed = 1;
 396                 }
 397                 return 0;
 398         }
 399
 400         status = acpi_bus_get_status(device);
 401         if (ACPI_FAILURE(status))
 402                 return -ENODEV;
 403
 404         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 405                 return 0;
 406
 407         if (status_changed)
 408                 *status_changed = 1;
 409
 410         /*
 411          * Device Insertion/Removal
 412          */
 413         if ((device->status.present) && !(old_status.present)) {
 414                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 415                 /* TBD: Handle device insertion */
 416         } else if (!(device->status.present) && (old_status.present)) {
 417                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 418                 /* TBD: Handle device removal */
 419         }
 420
 421         return 0;
 422 }
 423
 424 static int acpi_bus_check_scope(struct acpi_device *device)
 425 {
 426         int result = 0;
 427         int status_changed = 0;
 428
 429
 430         if (!device)
 431                 return -EINVAL;
 432
 433         /* Status Change? */
 434         result = acpi_bus_check_device(device, &status_changed);
 435         if (result)
 436                 return result;
 437
 438         if (!status_changed)
 439                 return 0;
 440
 441         /*
 442          * TBD: Enumerate child devices within this device's scope and
 443          *       run acpi_bus_check_device()'s on them.
 444          */
 445
 446         return 0;
 447 }
 448
 449 /**
 450  * acpi_bus_notify
 451  * ---------------
 452  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 453  */
 454 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 455 {
 456         int result = 0;
 457         struct acpi_device *device = NULL;
 458
 459
 460         if (acpi_bus_get_device(handle, &device))
 461                 return;
 462
 463         switch (type) {
 464
 465         case ACPI_NOTIFY_BUS_CHECK:
 466                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 467                                   "Received BUS CHECK notification for device [%s]\n",
 468                                   device->pnp.bus_id));
 469                 result = acpi_bus_check_scope(device);
 470                 /*
 471                  * TBD: We'll need to outsource certain events to non-ACPI
 472                  *      drivers via the device manager (device.c).
 473                  */
 474                 break;
 475
 476         case ACPI_NOTIFY_DEVICE_CHECK:
 477                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 478                                   "Received DEVICE CHECK notification for device [%s]\n",
 479                                   device->pnp.bus_id));
 480                 result = acpi_bus_check_device(device, NULL);
 481                 /*
 482                  * TBD: We'll need to outsource certain events to non-ACPI
 483                  *      drivers via the device manager (device.c).
 484                  */
 485                 break;
 486
 487         case ACPI_NOTIFY_DEVICE_WAKE:
 488                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 489                                   "Received DEVICE WAKE notification for device [%s]\n",
 490                                   device->pnp.bus_id));
 491                 /* TBD */
 492                 break;
 493
 494         case ACPI_NOTIFY_EJECT_REQUEST:
 495                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 496                                   "Received EJECT REQUEST notification for device [%s]\n",
 497                                   device->pnp.bus_id));
 498                 /* TBD */
 499                 break;
 500
 501         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 502                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 503                                   "Received DEVICE CHECK LIGHT notification for device [%s]\n",
 504                                   device->pnp.bus_id));
 505                 /* TBD: Exactly what does 'light' mean? */
 506                 break;
 507
 508         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 509                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 510                                   "Received FREQUENCY MISMATCH notification for device [%s]\n",
 511                                   device->pnp.bus_id));
 512                 /* TBD */
 513                 break;
 514
 515         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 516                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 517                                   "Received BUS MODE MISMATCH notification for device [%s]\n",
 518                                   device->pnp.bus_id));
 519                 /* TBD */
 520                 break;
 521
 522         case ACPI_NOTIFY_POWER_FAULT:
 523                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 524                                   "Received POWER FAULT notification for device [%s]\n",
 525                                   device->pnp.bus_id));
 526                 /* TBD */
 527                 break;
 528
 529         default:
 530                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 531                                   "Received unknown/unsupported notification [%08x]\n",
 532                                   type));
 533                 break;
 534         }
 535
 536         return;
 537 }
 538
 539 /* --------------------------------------------------------------------------
 540                              Initialization/Cleanup
 541    -------------------------------------------------------------------------- */
 542
 543 static int __init acpi_bus_init_irq(void)
 544 {
 545         acpi_status status = AE_OK;
 546         union acpi_object arg = { ACPI_TYPE_INTEGER };
 547         struct acpi_object_list arg_list = { 1, &arg };
 548         char *message = NULL;
 549
 550
 551         /*
 552          * Let the system know what interrupt model we are using by
 553          * evaluating the \_PIC object, if exists.
 554          */
 555
 556         switch (acpi_irq_model) {
 557         case ACPI_IRQ_MODEL_PIC:
 558                 message = "PIC";
 559                 break;
 560         case ACPI_IRQ_MODEL_IOAPIC:
 561                 message = "IOAPIC";
 562                 break;
 563         case ACPI_IRQ_MODEL_IOSAPIC:
 564                 message = "IOSAPIC";
 565                 break;
 566         case ACPI_IRQ_MODEL_PLATFORM:
 567                 message = "platform specific model";
 568                 break;
 569         default:
 570                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 571                 return -ENODEV;
 572         }
 573
 574         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 575
 576         arg.integer.value = acpi_irq_model;
 577
 578         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 579         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 580                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 581                 return -ENODEV;
 582         }
 583
 584         return 0;
 585 }
 586
 587 acpi_native_uint acpi_gbl_permanent_mmap;
 588
 589
 590 void __init acpi_early_init(void)
 591 {
 592         acpi_status status = AE_OK;
 593
 594         if (acpi_disabled)
 595                 return;
 596
 597         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 598
 599         /* enable workarounds, unless strict ACPI spec. compliance */
 600         if (!acpi_strict)
 601                 acpi_gbl_enable_interpreter_slack = TRUE;
 602
 603         acpi_gbl_permanent_mmap = 1;
 604
 605         status = acpi_reallocate_root_table();
 606         if (ACPI_FAILURE(status)) {
 607                 printk(KERN_ERR PREFIX
 608                        "Unable to reallocate ACPI tables\n");
 609                 goto error0;
 610         }
 611
 612         status = acpi_initialize_subsystem();
 613         if (ACPI_FAILURE(status)) {
 614                 printk(KERN_ERR PREFIX
 615                        "Unable to initialize the ACPI Interpreter\n");
 616                 goto error0;
 617         }
 618
 619         status = acpi_load_tables();
 620         if (ACPI_FAILURE(status)) {
 621                 printk(KERN_ERR PREFIX
 622                        "Unable to load the System Description Tables\n");
 623                 goto error0;
 624         }
 625
 626 #ifdef CONFIG_X86
 627         if (!acpi_ioapic) {
 628                 extern u8 acpi_sci_flags;
 629
 630                 /* compatible (0) means level (3) */
 631                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 632                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 633                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 634                 }
 635                 /* Set PIC-mode SCI trigger type */
 636                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 637                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 638         } else {
 639                 extern int acpi_sci_override_gsi;
 640                 /*
 641                  * now that acpi_gbl_FADT is initialized,
 642                  * update it with result from INT_SRC_OVR parsing
 643                  */
 644                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 645         }
 646 #endif
 647
 648         status =
 649             acpi_enable_subsystem(~
 650                                   (ACPI_NO_HARDWARE_INIT |
 651                                    ACPI_NO_ACPI_ENABLE));
 652         if (ACPI_FAILURE(status)) {
 653                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 654                 goto error0;
 655         }
 656
 657         return;
 658
 659       error0:
 660         disable_acpi();
 661         return;
 662 }
 663
 664 static int __init acpi_bus_init(void)
 665 {
 666         int result = 0;
 667         acpi_status status = AE_OK;
 668         extern acpi_status acpi_os_initialize1(void);
 669
 670
 671         status = acpi_os_initialize1();
 672
 673         status =
 674             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 675         if (ACPI_FAILURE(status)) {
 676                 printk(KERN_ERR PREFIX
 677                        "Unable to start the ACPI Interpreter\n");
 678                 goto error1;
 679         }
 680
 681         if (ACPI_FAILURE(status)) {
 682                 printk(KERN_ERR PREFIX
 683                        "Unable to initialize ACPI OS objects\n");
 684                 goto error1;
 685         }
 686 #ifdef CONFIG_ACPI_EC
 687         /*
 688          * ACPI 2.0 requires the EC driver to be loaded and work before
 689          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 690          * is called).
 691          *
 692          * This is accomplished by looking for the ECDT table, and getting
 693          * the EC parameters out of that.
 694          */
 695         status = acpi_ec_ecdt_probe();
 696         /* Ignore result. Not having an ECDT is not fatal. */
 697 #endif
 698
 699         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 700         if (ACPI_FAILURE(status)) {
 701                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 702                 goto error1;
 703         }
 704
 705         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 706
 707         /* Initialize sleep structures */
 708         acpi_sleep_init();
 709
 710         /*
 711          * Get the system interrupt model and evaluate \_PIC.
 712          */
 713         result = acpi_bus_init_irq();
 714         if (result)
 715                 goto error1;
 716
 717         /*
 718          * Register the for all standard device notifications.
 719          */
 720         status =
 721             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 722                                         &acpi_bus_notify, NULL);
 723         if (ACPI_FAILURE(status)) {
 724                 printk(KERN_ERR PREFIX
 725                        "Unable to register for device notifications\n");
 726                 goto error1;
 727         }
 728
 729         /*
 730          * Create the top ACPI proc directory
 731          */
 732         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 733
 734         return 0;
 735
 736         /* Mimic structured exception handling */
 737       error1:
 738         acpi_terminate();
 739         return -ENODEV;
 740 }
 741
 742 decl_subsys(acpi, NULL, NULL);
 743
 744 static int __init acpi_init(void)
 745 {
 746         int result = 0;
 747
 748
 749         if (acpi_disabled) {
 750                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 751                 return -ENODEV;
 752         }
 753
 754         result = firmware_register(&acpi_subsys);
 755         if (result < 0)
 756                 printk(KERN_WARNING "%s: firmware_register error: %d\n",
 757                         __FUNCTION__, result);
 758
 759         result = acpi_bus_init();
 760
 761         if (!result) {
 762 #ifdef CONFIG_PM_LEGACY
 763                 if (!PM_IS_ACTIVE())
 764                         pm_active = 1;
 765                 else {
 766                         printk(KERN_INFO PREFIX
 767                                "APM is already active, exiting\n");
 768                         disable_acpi();
 769                         result = -ENODEV;
 770                 }
 771 #endif
 772         } else
 773                 disable_acpi();
 774
 775         return result;
 776 }
 777
 778 subsys_initcall(acpi_init);