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/list.h>
  29 #include <linux/sched.h>
  30 #include <linux/pm.h>
  31 #include <linux/pm_legacy.h>
  32 #include <linux/device.h>
  33 #include <linux/proc_fs.h>
  34 #ifdef CONFIG_X86
  35 #include <asm/mpspec.h>
  36 #endif
  37 #include <acpi/acpi_bus.h>
  38 #include <acpi/acpi_drivers.h>
  39
  40 #define _COMPONENT              ACPI_BUS_COMPONENT
  41 ACPI_MODULE_NAME("acpi_bus")
  42 #ifdef  CONFIG_X86
  43 extern void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger);
  44 #endif
  45
  46 struct fadt_descriptor acpi_fadt;
  47 EXPORT_SYMBOL(acpi_fadt);
  48
  49 struct acpi_device *acpi_root;
  50 struct proc_dir_entry *acpi_root_dir;
  51 EXPORT_SYMBOL(acpi_root_dir);
  52
  53 #define STRUCT_TO_INT(s)        (*((int*)&s))
  54
  55 /* --------------------------------------------------------------------------
  56                                 Device Management
  57    -------------------------------------------------------------------------- */
  58
  59 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
  60 {
  61         acpi_status status = AE_OK;
  62
  63         ACPI_FUNCTION_TRACE("acpi_bus_get_device");
  64
  65         if (!device)
  66                 return_VALUE(-EINVAL);
  67
  68         /* TBD: Support fixed-feature devices */
  69
  70         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
  71         if (ACPI_FAILURE(status) || !*device) {
  72                 ACPI_EXCEPTION((AE_INFO, status, "No context for object [%p]", handle));
  73                 return_VALUE(-ENODEV);
  74         }
  75
  76         return_VALUE(0);
  77 }
  78
  79 EXPORT_SYMBOL(acpi_bus_get_device);
  80
  81 int acpi_bus_get_status(struct acpi_device *device)
  82 {
  83         acpi_status status = AE_OK;
  84         unsigned long sta = 0;
  85
  86         ACPI_FUNCTION_TRACE("acpi_bus_get_status");
  87
  88         if (!device)
  89                 return_VALUE(-EINVAL);
  90
  91         /*
  92          * Evaluate _STA if present.
  93          */
  94         if (device->flags.dynamic_status) {
  95                 status =
  96                     acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
  97                 if (ACPI_FAILURE(status))
  98                         return_VALUE(-ENODEV);
  99                 STRUCT_TO_INT(device->status) = (int)sta;
 100         }
 101
 102         /*
 103          * Otherwise we assume the status of our parent (unless we don't
 104          * have one, in which case status is implied).
 105          */
 106         else if (device->parent)
 107                 device->status = device->parent->status;
 108         else
 109                 STRUCT_TO_INT(device->status) = 0x0F;
 110
 111         if (device->status.functional && !device->status.present) {
 112                 printk(KERN_WARNING PREFIX "Device [%s] status [%08x]: "
 113                        "functional but not present; setting present\n",
 114                        device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status));
 115                 device->status.present = 1;
 116         }
 117
 118         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 119                           device->pnp.bus_id,
 120                           (u32) STRUCT_TO_INT(device->status)));
 121
 122         return_VALUE(0);
 123 }
 124
 125 EXPORT_SYMBOL(acpi_bus_get_status);
 126
 127 /* --------------------------------------------------------------------------
 128                                  Power Management
 129    -------------------------------------------------------------------------- */
 130
 131 int acpi_bus_get_power(acpi_handle handle, int *state)
 132 {
 133         int result = 0;
 134         acpi_status status = 0;
 135         struct acpi_device *device = NULL;
 136         unsigned long psc = 0;
 137
 138         ACPI_FUNCTION_TRACE("acpi_bus_get_power");
 139
 140         result = acpi_bus_get_device(handle, &device);
 141         if (result)
 142                 return_VALUE(result);
 143
 144         *state = ACPI_STATE_UNKNOWN;
 145
 146         if (!device->flags.power_manageable) {
 147                 /* TBD: Non-recursive algorithm for walking up hierarchy */
 148                 if (device->parent)
 149                         *state = device->parent->power.state;
 150                 else
 151                         *state = ACPI_STATE_D0;
 152         } else {
 153                 /*
 154                  * Get the device's power state either directly (via _PSC) or
 155                  * indirectly (via power resources).
 156                  */
 157                 if (device->power.flags.explicit_get) {
 158                         status = acpi_evaluate_integer(device->handle, "_PSC",
 159                                                        NULL, &psc);
 160                         if (ACPI_FAILURE(status))
 161                                 return_VALUE(-ENODEV);
 162                         device->power.state = (int)psc;
 163                 } else if (device->power.flags.power_resources) {
 164                         result = acpi_power_get_inferred_state(device);
 165                         if (result)
 166                                 return_VALUE(result);
 167                 }
 168
 169                 *state = device->power.state;
 170         }
 171
 172         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
 173                           device->pnp.bus_id, device->power.state));
 174
 175         return_VALUE(0);
 176 }
 177
 178 EXPORT_SYMBOL(acpi_bus_get_power);
 179
 180 int acpi_bus_set_power(acpi_handle handle, int state)
 181 {
 182         int result = 0;
 183         acpi_status status = AE_OK;
 184         struct acpi_device *device = NULL;
 185         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 186
 187         ACPI_FUNCTION_TRACE("acpi_bus_set_power");
 188
 189         result = acpi_bus_get_device(handle, &device);
 190         if (result)
 191                 return_VALUE(result);
 192
 193         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
 194                 return_VALUE(-EINVAL);
 195
 196         /* Make sure this is a valid target state */
 197
 198         if (!device->flags.power_manageable) {
 199                 printk(KERN_DEBUG "Device `[%s]is not power manageable",
 200                                 device->kobj.name);
 201                 return_VALUE(-ENODEV);
 202         }
 203         /*
 204          * Get device's current power state if it's unknown
 205          * This means device power state isn't initialized or previous setting failed
 206          */
 207         if (!device->flags.force_power_state) {
 208                 if (device->power.state == ACPI_STATE_UNKNOWN)
 209                         acpi_bus_get_power(device->handle, &device->power.state);
 210                 if (state == device->power.state) {
 211                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
 212                                           state));
 213                         return_VALUE(0);
 214                 }
 215         }
 216         if (!device->power.states[state].flags.valid) {
 217                 ACPI_WARNING((AE_INFO, "Device does not support D%d", state));
 218                 return_VALUE(-ENODEV);
 219         }
 220         if (device->parent && (state < device->parent->power.state)) {
 221                 ACPI_WARNING((AE_INFO,
 222                               "Cannot set device to a higher-powered"
 223                               " state than parent"));
 224                 return_VALUE(-ENODEV);
 225         }
 226
 227         /*
 228          * Transition Power
 229          * ----------------
 230          * On transitions to a high-powered state we first apply power (via
 231          * power resources) then evalute _PSx.  Conversly for transitions to
 232          * a lower-powered state.
 233          */
 234         if (state < device->power.state) {
 235                 if (device->power.flags.power_resources) {
 236                         result = acpi_power_transition(device, state);
 237                         if (result)
 238                                 goto end;
 239                 }
 240                 if (device->power.states[state].flags.explicit_set) {
 241                         status = acpi_evaluate_object(device->handle,
 242                                                       object_name, NULL, NULL);
 243                         if (ACPI_FAILURE(status)) {
 244                                 result = -ENODEV;
 245                                 goto end;
 246                         }
 247                 }
 248         } else {
 249                 if (device->power.states[state].flags.explicit_set) {
 250                         status = acpi_evaluate_object(device->handle,
 251                                                       object_name, NULL, NULL);
 252                         if (ACPI_FAILURE(status)) {
 253                                 result = -ENODEV;
 254                                 goto end;
 255                         }
 256                 }
 257                 if (device->power.flags.power_resources) {
 258                         result = acpi_power_transition(device, state);
 259                         if (result)
 260                                 goto end;
 261                 }
 262         }
 263
 264       end:
 265         if (result)
 266                 ACPI_WARNING((AE_INFO,
 267                               "Transitioning device [%s] to D%d",
 268                               device->pnp.bus_id, state));
 269         else
 270                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 271                                   "Device [%s] transitioned to D%d\n",
 272                                   device->pnp.bus_id, state));
 273
 274         return_VALUE(result);
 275 }
 276
 277 EXPORT_SYMBOL(acpi_bus_set_power);
 278
 279 /* --------------------------------------------------------------------------
 280                                 Event Management
 281    -------------------------------------------------------------------------- */
 282
 283 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 284
 285 LIST_HEAD(acpi_bus_event_list);
 286 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 287
 288 extern int event_is_open;
 289
 290 int acpi_bus_generate_event(struct acpi_device *device, u8 type, int data)
 291 {
 292         struct acpi_bus_event *event = NULL;
 293         unsigned long flags = 0;
 294
 295         ACPI_FUNCTION_TRACE("acpi_bus_generate_event");
 296
 297         if (!device)
 298                 return_VALUE(-EINVAL);
 299
 300         /* drop event on the floor if no one's listening */
 301         if (!event_is_open)
 302                 return_VALUE(0);
 303
 304         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 305         if (!event)
 306                 return_VALUE(-ENOMEM);
 307
 308         strcpy(event->device_class, device->pnp.device_class);
 309         strcpy(event->bus_id, device->pnp.bus_id);
 310         event->type = type;
 311         event->data = data;
 312
 313         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 314         list_add_tail(&event->node, &acpi_bus_event_list);
 315         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 316
 317         wake_up_interruptible(&acpi_bus_event_queue);
 318
 319         return_VALUE(0);
 320 }
 321
 322 EXPORT_SYMBOL(acpi_bus_generate_event);
 323
 324 int acpi_bus_receive_event(struct acpi_bus_event *event)
 325 {
 326         unsigned long flags = 0;
 327         struct acpi_bus_event *entry = NULL;
 328
 329         DECLARE_WAITQUEUE(wait, current);
 330
 331         ACPI_FUNCTION_TRACE("acpi_bus_receive_event");
 332
 333         if (!event)
 334                 return_VALUE(-EINVAL);
 335
 336         if (list_empty(&acpi_bus_event_list)) {
 337
 338                 set_current_state(TASK_INTERRUPTIBLE);
 339                 add_wait_queue(&acpi_bus_event_queue, &wait);
 340
 341                 if (list_empty(&acpi_bus_event_list))
 342                         schedule();
 343
 344                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 345                 set_current_state(TASK_RUNNING);
 346
 347                 if (signal_pending(current))
 348                         return_VALUE(-ERESTARTSYS);
 349         }
 350
 351         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 352         entry =
 353             list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node);
 354         if (entry)
 355                 list_del(&entry->node);
 356         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 357
 358         if (!entry)
 359                 return_VALUE(-ENODEV);
 360
 361         memcpy(event, entry, sizeof(struct acpi_bus_event));
 362
 363         kfree(entry);
 364
 365         return_VALUE(0);
 366 }
 367
 368 EXPORT_SYMBOL(acpi_bus_receive_event);
 369
 370 /* --------------------------------------------------------------------------
 371                              Notification Handling
 372    -------------------------------------------------------------------------- */
 373
 374 static int
 375 acpi_bus_check_device(struct acpi_device *device, int *status_changed)
 376 {
 377         acpi_status status = 0;
 378         struct acpi_device_status old_status;
 379
 380         ACPI_FUNCTION_TRACE("acpi_bus_check_device");
 381
 382         if (!device)
 383                 return_VALUE(-EINVAL);
 384
 385         if (status_changed)
 386                 *status_changed = 0;
 387
 388         old_status = device->status;
 389
 390         /*
 391          * Make sure this device's parent is present before we go about
 392          * messing with the device.
 393          */
 394         if (device->parent && !device->parent->status.present) {
 395                 device->status = device->parent->status;
 396                 if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
 397                         if (status_changed)
 398                                 *status_changed = 1;
 399                 }
 400                 return_VALUE(0);
 401         }
 402
 403         status = acpi_bus_get_status(device);
 404         if (ACPI_FAILURE(status))
 405                 return_VALUE(-ENODEV);
 406
 407         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 408                 return_VALUE(0);
 409
 410         if (status_changed)
 411                 *status_changed = 1;
 412
 413         /*
 414          * Device Insertion/Removal
 415          */
 416         if ((device->status.present) && !(old_status.present)) {
 417                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 418                 /* TBD: Handle device insertion */
 419         } else if (!(device->status.present) && (old_status.present)) {
 420                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 421                 /* TBD: Handle device removal */
 422         }
 423
 424         return_VALUE(0);
 425 }
 426
 427 static int acpi_bus_check_scope(struct acpi_device *device)
 428 {
 429         int result = 0;
 430         int status_changed = 0;
 431
 432         ACPI_FUNCTION_TRACE("acpi_bus_check_scope");
 433
 434         if (!device)
 435                 return_VALUE(-EINVAL);
 436
 437         /* Status Change? */
 438         result = acpi_bus_check_device(device, &status_changed);
 439         if (result)
 440                 return_VALUE(result);
 441
 442         if (!status_changed)
 443                 return_VALUE(0);
 444
 445         /*
 446          * TBD: Enumerate child devices within this device's scope and
 447          *       run acpi_bus_check_device()'s on them.
 448          */
 449
 450         return_VALUE(0);
 451 }
 452
 453 /**
 454  * acpi_bus_notify
 455  * ---------------
 456  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 457  */
 458 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 459 {
 460         int result = 0;
 461         struct acpi_device *device = NULL;
 462
 463         ACPI_FUNCTION_TRACE("acpi_bus_notify");
 464
 465         if (acpi_bus_get_device(handle, &device))
 466                 return_VOID;
 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_VOID;
 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         ACPI_FUNCTION_TRACE("acpi_bus_init_irq");
 556
 557         /*
 558          * Let the system know what interrupt model we are using by
 559          * evaluating the \_PIC object, if exists.
 560          */
 561
 562         switch (acpi_irq_model) {
 563         case ACPI_IRQ_MODEL_PIC:
 564                 message = "PIC";
 565                 break;
 566         case ACPI_IRQ_MODEL_IOAPIC:
 567                 message = "IOAPIC";
 568                 break;
 569         case ACPI_IRQ_MODEL_IOSAPIC:
 570                 message = "IOSAPIC";
 571                 break;
 572         default:
 573                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 574                 return_VALUE(-ENODEV);
 575         }
 576
 577         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 578
 579         arg.integer.value = acpi_irq_model;
 580
 581         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 582         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 583                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 584                 return_VALUE(-ENODEV);
 585         }
 586
 587         return_VALUE(0);
 588 }
 589
 590 void __init acpi_early_init(void)
 591 {
 592         acpi_status status = AE_OK;
 593         struct acpi_buffer buffer = { sizeof(acpi_fadt), &acpi_fadt };
 594
 595         ACPI_FUNCTION_TRACE("acpi_early_init");
 596
 597         if (acpi_disabled)
 598                 return_VOID;
 599
 600         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 601
 602         /* enable workarounds, unless strict ACPI spec. compliance */
 603         if (!acpi_strict)
 604                 acpi_gbl_enable_interpreter_slack = TRUE;
 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         /*
 621          * Get a separate copy of the FADT for use by other drivers.
 622          */
 623         status = acpi_get_table(ACPI_TABLE_ID_FADT, 1, &buffer);
 624         if (ACPI_FAILURE(status)) {
 625                 printk(KERN_ERR PREFIX "Unable to get the FADT\n");
 626                 goto error0;
 627         }
 628 #ifdef CONFIG_X86
 629         if (!acpi_ioapic) {
 630                 extern acpi_interrupt_flags acpi_sci_flags;
 631
 632                 /* compatible (0) means level (3) */
 633                 if (acpi_sci_flags.trigger == 0)
 634                         acpi_sci_flags.trigger = 3;
 635
 636                 /* Set PIC-mode SCI trigger type */
 637                 acpi_pic_sci_set_trigger(acpi_fadt.sci_int,
 638                                          acpi_sci_flags.trigger);
 639         } else {
 640                 extern int acpi_sci_override_gsi;
 641                 /*
 642                  * now that acpi_fadt is initialized,
 643                  * update it with result from INT_SRC_OVR parsing
 644                  */
 645                 acpi_fadt.sci_int = acpi_sci_override_gsi;
 646         }
 647 #endif
 648
 649         status =
 650             acpi_enable_subsystem(~
 651                                   (ACPI_NO_HARDWARE_INIT |
 652                                    ACPI_NO_ACPI_ENABLE));
 653         if (ACPI_FAILURE(status)) {
 654                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 655                 goto error0;
 656         }
 657
 658         return_VOID;
 659
 660       error0:
 661         disable_acpi();
 662         return_VOID;
 663 }
 664
 665 static int __init acpi_bus_init(void)
 666 {
 667         int result = 0;
 668         acpi_status status = AE_OK;
 669         extern acpi_status acpi_os_initialize1(void);
 670
 671         ACPI_FUNCTION_TRACE("acpi_bus_init");
 672
 673         status = acpi_os_initialize1();
 674
 675         status =
 676             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 677         if (ACPI_FAILURE(status)) {
 678                 printk(KERN_ERR PREFIX
 679                        "Unable to start the ACPI Interpreter\n");
 680                 goto error1;
 681         }
 682
 683         if (ACPI_FAILURE(status)) {
 684                 printk(KERN_ERR PREFIX
 685                        "Unable to initialize ACPI OS objects\n");
 686                 goto error1;
 687         }
 688 #ifdef CONFIG_ACPI_EC
 689         /*
 690          * ACPI 2.0 requires the EC driver to be loaded and work before
 691          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 692          * is called).
 693          *
 694          * This is accomplished by looking for the ECDT table, and getting
 695          * the EC parameters out of that.
 696          */
 697         status = acpi_ec_ecdt_probe();
 698         /* Ignore result. Not having an ECDT is not fatal. */
 699 #endif
 700
 701         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 702         if (ACPI_FAILURE(status)) {
 703                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 704                 goto error1;
 705         }
 706
 707         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 708
 709         /*
 710          * Get the system interrupt model and evaluate \_PIC.
 711          */
 712         result = acpi_bus_init_irq();
 713         if (result)
 714                 goto error1;
 715
 716         /*
 717          * Register the for all standard device notifications.
 718          */
 719         status =
 720             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 721                                         &acpi_bus_notify, NULL);
 722         if (ACPI_FAILURE(status)) {
 723                 printk(KERN_ERR PREFIX
 724                        "Unable to register for device notifications\n");
 725                 goto error1;
 726         }
 727
 728         /*
 729          * Create the top ACPI proc directory
 730          */
 731         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 732
 733         return_VALUE(0);
 734
 735         /* Mimic structured exception handling */
 736       error1:
 737         acpi_terminate();
 738         return_VALUE(-ENODEV);
 739 }
 740
 741 decl_subsys(acpi, NULL, NULL);
 742
 743 static int __init acpi_init(void)
 744 {
 745         int result = 0;
 746
 747         ACPI_FUNCTION_TRACE("acpi_init");
 748
 749         if (acpi_disabled) {
 750                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 751                 return_VALUE(-ENODEV);
 752         }
 753
 754         firmware_register(&acpi_subsys);
 755
 756         result = acpi_bus_init();
 757
 758         if (!result) {
 759 #ifdef CONFIG_PM_LEGACY
 760                 if (!PM_IS_ACTIVE())
 761                         pm_active = 1;
 762                 else {
 763                         printk(KERN_INFO PREFIX
 764                                "APM is already active, exiting\n");
 765                         disable_acpi();
 766                         result = -ENODEV;
 767                 }
 768 #endif
 769         } else
 770                 disable_acpi();
 771
 772         return_VALUE(result);
 773 }
 774
 775 subsys_initcall(acpi_init);