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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/list.h>
  29 #include <linux/sched.h>
  30 #include <linux/pm.h>
  31 #include <linux/device.h>
  32 #include <linux/proc_fs.h>
  33 #ifdef CONFIG_X86
  34 #include <asm/mpspec.h>
  35 #endif
  36 #include <acpi/acpi_bus.h>
  37 #include <acpi/acpi_drivers.h>
  38
  39
  40 #define _COMPONENT              ACPI_BUS_COMPONENT
  41 ACPI_MODULE_NAME                ("acpi_bus")
  42
  43 #ifdef  CONFIG_X86
  44 extern void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger);
  45 #endif
  46
  47 FADT_DESCRIPTOR                 acpi_fadt;
  48 EXPORT_SYMBOL(acpi_fadt);
  49
  50 struct acpi_device              *acpi_root;
  51 struct proc_dir_entry           *acpi_root_dir;
  52 EXPORT_SYMBOL(acpi_root_dir);
  53
  54 #define STRUCT_TO_INT(s)        (*((int*)&s))
  55
  56 /* --------------------------------------------------------------------------
  57                                 Device Management
  58    -------------------------------------------------------------------------- */
  59
  60 int
  61 acpi_bus_get_device (
  62         acpi_handle             handle,
  63         struct acpi_device      **device)
  64 {
  65         acpi_status             status = AE_OK;
  66
  67         ACPI_FUNCTION_TRACE("acpi_bus_get_device");
  68
  69         if (!device)
  70                 return_VALUE(-EINVAL);
  71
  72         /* TBD: Support fixed-feature devices */
  73
  74         status = acpi_get_data(handle, acpi_bus_data_handler, (void**) device);
  75         if (ACPI_FAILURE(status) || !*device) {
  76                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "No context for object [%p]\n",
  77                         handle));
  78                 return_VALUE(-ENODEV);
  79         }
  80
  81         return_VALUE(0);
  82 }
  83 EXPORT_SYMBOL(acpi_bus_get_device);
  84
  85 int
  86 acpi_bus_get_status (
  87         struct acpi_device      *device)
  88 {
  89         acpi_status             status = AE_OK;
  90         unsigned long           sta = 0;
  91
  92         ACPI_FUNCTION_TRACE("acpi_bus_get_status");
  93
  94         if (!device)
  95                 return_VALUE(-EINVAL);
  96
  97         /*
  98          * Evaluate _STA if present.
  99          */
 100         if (device->flags.dynamic_status) {
 101                 status = acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
 102                 if (ACPI_FAILURE(status))
 103                         return_VALUE(-ENODEV);
 104                 STRUCT_TO_INT(device->status) = (int) sta;
 105         }
 106
 107         /*
 108          * Otherwise we assume the status of our parent (unless we don't
 109          * have one, in which case status is implied).
 110          */
 111         else if (device->parent)
 112                 device->status = device->parent->status;
 113         else
 114                 STRUCT_TO_INT(device->status) = 0x0F;
 115
 116         if (device->status.functional && !device->status.present) {
 117                 printk(KERN_WARNING PREFIX "Device [%s] status [%08x]: "
 118                         "functional but not present; setting present\n",
 119                         device->pnp.bus_id,
 120                         (u32) STRUCT_TO_INT(device->status));
 121                 device->status.present = 1;
 122         }
 123
 124         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 125                 device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status)));
 126
 127         return_VALUE(0);
 128 }
 129 EXPORT_SYMBOL(acpi_bus_get_status);
 130
 131
 132 /* --------------------------------------------------------------------------
 133                                  Power Management
 134    -------------------------------------------------------------------------- */
 135
 136 int
 137 acpi_bus_get_power (
 138         acpi_handle             handle,
 139         int                     *state)
 140 {
 141         int                     result = 0;
 142         acpi_status             status = 0;
 143         struct acpi_device      *device = NULL;
 144         unsigned long           psc = 0;
 145
 146         ACPI_FUNCTION_TRACE("acpi_bus_get_power");
 147
 148         result = acpi_bus_get_device(handle, &device);
 149         if (result)
 150                 return_VALUE(result);
 151
 152         *state = ACPI_STATE_UNKNOWN;
 153
 154         if (!device->flags.power_manageable) {
 155                 /* TBD: Non-recursive algorithm for walking up hierarchy */
 156                 if (device->parent)
 157                         *state = device->parent->power.state;
 158                 else
 159                         *state = ACPI_STATE_D0;
 160         }
 161         else {
 162                 /*
 163                  * Get the device's power state either directly (via _PSC) or
 164                  * indirectly (via power resources).
 165                  */
 166                 if (device->power.flags.explicit_get) {
 167                         status = acpi_evaluate_integer(device->handle, "_PSC",
 168                                 NULL, &psc);
 169                         if (ACPI_FAILURE(status))
 170                                 return_VALUE(-ENODEV);
 171                         device->power.state = (int) psc;
 172                 }
 173                 else if (device->power.flags.power_resources) {
 174                         result = acpi_power_get_inferred_state(device);
 175                         if (result)
 176                                 return_VALUE(result);
 177                 }
 178
 179                 *state = device->power.state;
 180         }
 181
 182         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
 183                 device->pnp.bus_id, device->power.state));
 184
 185         return_VALUE(0);
 186 }
 187 EXPORT_SYMBOL(acpi_bus_get_power);
 188
 189
 190 int
 191 acpi_bus_set_power (
 192         acpi_handle             handle,
 193         int                     state)
 194 {
 195         int                     result = 0;
 196         acpi_status             status = AE_OK;
 197         struct acpi_device      *device = NULL;
 198         char                    object_name[5] = {'_','P','S','0'+state,'\0'};
 199
 200         ACPI_FUNCTION_TRACE("acpi_bus_set_power");
 201
 202         result = acpi_bus_get_device(handle, &device);
 203         if (result)
 204                 return_VALUE(result);
 205
 206         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
 207                 return_VALUE(-EINVAL);
 208
 209         /* Make sure this is a valid target state */
 210
 211         if (!device->flags.power_manageable) {
 212                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Device is not power manageable\n"));
 213                 return_VALUE(-ENODEV);
 214         }
 215         /*
 216          * Get device's current power state if it's unknown
 217          * This means device power state isn't initialized or previous setting failed
 218          */
 219         if (device->power.state == ACPI_STATE_UNKNOWN)
 220                 acpi_bus_get_power(device->handle, &device->power.state);
 221         if (state == device->power.state) {
 222                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n", state));
 223                 return_VALUE(0);
 224         }
 225         if (!device->power.states[state].flags.valid) {
 226                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Device does not support D%d\n", state));
 227                 return_VALUE(-ENODEV);
 228         }
 229         if (device->parent && (state < device->parent->power.state)) {
 230                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Cannot set device to a higher-powered state than parent\n"));
 231                 return_VALUE(-ENODEV);
 232         }
 233
 234         /*
 235          * Transition Power
 236          * ----------------
 237          * On transitions to a high-powered state we first apply power (via
 238          * power resources) then evalute _PSx.  Conversly for transitions to
 239          * a lower-powered state.
 240          */
 241         if (state < device->power.state) {
 242                 if (device->power.flags.power_resources) {
 243                         result = acpi_power_transition(device, state);
 244                         if (result)
 245                                 goto end;
 246                 }
 247                 if (device->power.states[state].flags.explicit_set) {
 248                         status = acpi_evaluate_object(device->handle,
 249                                 object_name, NULL, NULL);
 250                         if (ACPI_FAILURE(status)) {
 251                                 result = -ENODEV;
 252                                 goto end;
 253                         }
 254                 }
 255         }
 256         else {
 257                 if (device->power.states[state].flags.explicit_set) {
 258                         status = acpi_evaluate_object(device->handle,
 259                                 object_name, NULL, NULL);
 260                         if (ACPI_FAILURE(status)) {
 261                                 result = -ENODEV;
 262                                 goto end;
 263                         }
 264                 }
 265                 if (device->power.flags.power_resources) {
 266                         result = acpi_power_transition(device, state);
 267                         if (result)
 268                                 goto end;
 269                 }
 270         }
 271
 272 end:
 273         if (result)
 274                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Error transitioning device [%s] to D%d\n",
 275                         device->pnp.bus_id, state));
 276         else
 277                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] transitioned to D%d\n",
 278                         device->pnp.bus_id, state));
 279
 280         return_VALUE(result);
 281 }
 282 EXPORT_SYMBOL(acpi_bus_set_power);
 283
 284
 285
 286 /* --------------------------------------------------------------------------
 287                                 Event Management
 288    -------------------------------------------------------------------------- */
 289
 290 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 291
 292 LIST_HEAD(acpi_bus_event_list);
 293 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 294
 295 extern int                      event_is_open;
 296
 297 int
 298 acpi_bus_generate_event (
 299         struct acpi_device      *device,
 300         u8                      type,
 301         int                     data)
 302 {
 303         struct acpi_bus_event   *event = NULL;
 304         unsigned long           flags = 0;
 305
 306         ACPI_FUNCTION_TRACE("acpi_bus_generate_event");
 307
 308         if (!device)
 309                 return_VALUE(-EINVAL);
 310
 311         /* drop event on the floor if no one's listening */
 312         if (!event_is_open)
 313                 return_VALUE(0);
 314
 315         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 316         if (!event)
 317                 return_VALUE(-ENOMEM);
 318
 319         strcpy(event->device_class, device->pnp.device_class);
 320         strcpy(event->bus_id, device->pnp.bus_id);
 321         event->type = type;
 322         event->data = data;
 323
 324         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 325         list_add_tail(&event->node, &acpi_bus_event_list);
 326         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 327
 328         wake_up_interruptible(&acpi_bus_event_queue);
 329
 330         return_VALUE(0);
 331 }
 332 EXPORT_SYMBOL(acpi_bus_generate_event);
 333
 334 int
 335 acpi_bus_receive_event (
 336         struct acpi_bus_event   *event)
 337 {
 338         unsigned long           flags = 0;
 339         struct acpi_bus_event   *entry = NULL;
 340
 341         DECLARE_WAITQUEUE(wait, current);
 342
 343         ACPI_FUNCTION_TRACE("acpi_bus_receive_event");
 344
 345         if (!event)
 346                 return_VALUE(-EINVAL);
 347
 348         if (list_empty(&acpi_bus_event_list)) {
 349
 350                 set_current_state(TASK_INTERRUPTIBLE);
 351                 add_wait_queue(&acpi_bus_event_queue, &wait);
 352
 353                 if (list_empty(&acpi_bus_event_list))
 354                         schedule();
 355
 356                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 357                 set_current_state(TASK_RUNNING);
 358
 359                 if (signal_pending(current))
 360                         return_VALUE(-ERESTARTSYS);
 361         }
 362
 363         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 364         entry = list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node);
 365         if (entry)
 366                 list_del(&entry->node);
 367         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 368
 369         if (!entry)
 370                 return_VALUE(-ENODEV);
 371
 372         memcpy(event, entry, sizeof(struct acpi_bus_event));
 373
 374         kfree(entry);
 375
 376         return_VALUE(0);
 377 }
 378 EXPORT_SYMBOL(acpi_bus_receive_event);
 379
 380
 381 /* --------------------------------------------------------------------------
 382                              Notification Handling
 383    -------------------------------------------------------------------------- */
 384
 385 static int
 386 acpi_bus_check_device (
 387         struct acpi_device      *device,
 388         int                     *status_changed)
 389 {
 390         acpi_status             status = 0;
 391         struct acpi_device_status old_status;
 392
 393         ACPI_FUNCTION_TRACE("acpi_bus_check_device");
 394
 395         if (!device)
 396                 return_VALUE(-EINVAL);
 397
 398         if (status_changed)
 399                 *status_changed = 0;
 400
 401         old_status = device->status;
 402
 403         /*
 404          * Make sure this device's parent is present before we go about
 405          * messing with the device.
 406          */
 407         if (device->parent && !device->parent->status.present) {
 408                 device->status = device->parent->status;
 409                 if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
 410                         if (status_changed)
 411                                 *status_changed = 1;
 412                 }
 413                 return_VALUE(0);
 414         }
 415
 416         status = acpi_bus_get_status(device);
 417         if (ACPI_FAILURE(status))
 418                 return_VALUE(-ENODEV);
 419
 420         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 421                 return_VALUE(0);
 422
 423         if (status_changed)
 424                 *status_changed = 1;
 425
 426         /*
 427          * Device Insertion/Removal
 428          */
 429         if ((device->status.present) && !(old_status.present)) {
 430                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 431                 /* TBD: Handle device insertion */
 432         }
 433         else if (!(device->status.present) && (old_status.present)) {
 434                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 435                 /* TBD: Handle device removal */
 436         }
 437
 438         return_VALUE(0);
 439 }
 440
 441
 442 static int
 443 acpi_bus_check_scope (
 444         struct acpi_device      *device)
 445 {
 446         int                     result = 0;
 447         int                     status_changed = 0;
 448
 449         ACPI_FUNCTION_TRACE("acpi_bus_check_scope");
 450
 451         if (!device)
 452                 return_VALUE(-EINVAL);
 453
 454         /* Status Change? */
 455         result = acpi_bus_check_device(device, &status_changed);
 456         if (result)
 457                 return_VALUE(result);
 458
 459         if (!status_changed)
 460                 return_VALUE(0);
 461
 462         /*
 463          * TBD: Enumerate child devices within this device's scope and
 464          *       run acpi_bus_check_device()'s on them.
 465          */
 466
 467         return_VALUE(0);
 468 }
 469
 470
 471 /**
 472  * acpi_bus_notify
 473  * ---------------
 474  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 475  */
 476 static void
 477 acpi_bus_notify (
 478         acpi_handle             handle,
 479         u32                     type,
 480         void                    *data)
 481 {
 482         int                     result = 0;
 483         struct acpi_device      *device = NULL;
 484
 485         ACPI_FUNCTION_TRACE("acpi_bus_notify");
 486
 487         if (acpi_bus_get_device(handle, &device))
 488                 return_VOID;
 489
 490         switch (type) {
 491
 492         case ACPI_NOTIFY_BUS_CHECK:
 493                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received BUS CHECK notification for device [%s]\n",
 494                         device->pnp.bus_id));
 495                 result = acpi_bus_check_scope(device);
 496                 /*
 497                  * TBD: We'll need to outsource certain events to non-ACPI
 498                  *      drivers via the device manager (device.c).
 499                  */
 500                 break;
 501
 502         case ACPI_NOTIFY_DEVICE_CHECK:
 503                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received DEVICE CHECK notification for device [%s]\n",
 504                         device->pnp.bus_id));
 505                 result = acpi_bus_check_device(device, NULL);
 506                 /*
 507                  * TBD: We'll need to outsource certain events to non-ACPI
 508                  *      drivers via the device manager (device.c).
 509                  */
 510                 break;
 511
 512         case ACPI_NOTIFY_DEVICE_WAKE:
 513                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received DEVICE WAKE notification for device [%s]\n",
 514                         device->pnp.bus_id));
 515                 /* TBD */
 516                 break;
 517
 518         case ACPI_NOTIFY_EJECT_REQUEST:
 519                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received EJECT REQUEST notification for device [%s]\n",
 520                         device->pnp.bus_id));
 521                 /* TBD */
 522                 break;
 523
 524         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 525                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received DEVICE CHECK LIGHT notification for device [%s]\n",
 526                         device->pnp.bus_id));
 527                 /* TBD: Exactly what does 'light' mean? */
 528                 break;
 529
 530         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 531                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received FREQUENCY MISMATCH notification for device [%s]\n",
 532                         device->pnp.bus_id));
 533                 /* TBD */
 534                 break;
 535
 536         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 537                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received BUS MODE MISMATCH notification for device [%s]\n",
 538                         device->pnp.bus_id));
 539                 /* TBD */
 540                 break;
 541
 542         case ACPI_NOTIFY_POWER_FAULT:
 543                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received POWER FAULT notification for device [%s]\n",
 544                         device->pnp.bus_id));
 545                 /* TBD */
 546                 break;
 547
 548         default:
 549                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received unknown/unsupported notification [%08x]\n",
 550                         type));
 551                 break;
 552         }
 553
 554         return_VOID;
 555 }
 556
 557 /* --------------------------------------------------------------------------
 558                              Initialization/Cleanup
 559    -------------------------------------------------------------------------- */
 560
 561 static int __init
 562 acpi_bus_init_irq (void)
 563 {
 564         acpi_status             status = AE_OK;
 565         union acpi_object       arg = {ACPI_TYPE_INTEGER};
 566         struct acpi_object_list arg_list = {1, &arg};
 567         char                    *message = NULL;
 568
 569         ACPI_FUNCTION_TRACE("acpi_bus_init_irq");
 570
 571         /*
 572          * Let the system know what interrupt model we are using by
 573          * evaluating the \_PIC object, if exists.
 574          */
 575
 576         switch (acpi_irq_model) {
 577         case ACPI_IRQ_MODEL_PIC:
 578                 message = "PIC";
 579                 break;
 580         case ACPI_IRQ_MODEL_IOAPIC:
 581                 message = "IOAPIC";
 582                 break;
 583         case ACPI_IRQ_MODEL_IOSAPIC:
 584                 message = "IOSAPIC";
 585                 break;
 586         default:
 587                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 588                 return_VALUE(-ENODEV);
 589         }
 590
 591         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 592
 593         arg.integer.value = acpi_irq_model;
 594
 595         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 596         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 597                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PIC\n"));
 598                 return_VALUE(-ENODEV);
 599         }
 600
 601         return_VALUE(0);
 602 }
 603
 604
 605 void __init
 606 acpi_early_init (void)
 607 {
 608         acpi_status             status = AE_OK;
 609         struct acpi_buffer      buffer = {sizeof(acpi_fadt), &acpi_fadt};
 610
 611         ACPI_FUNCTION_TRACE("acpi_early_init");
 612
 613         if (acpi_disabled)
 614                 return_VOID;
 615
 616         /* enable workarounds, unless strict ACPI spec. compliance */
 617         if (!acpi_strict)
 618                 acpi_gbl_enable_interpreter_slack = TRUE;
 619
 620         status = acpi_initialize_subsystem();
 621         if (ACPI_FAILURE(status)) {
 622                 printk(KERN_ERR PREFIX "Unable to initialize the ACPI Interpreter\n");
 623                 goto error0;
 624         }
 625
 626         status = acpi_load_tables();
 627         if (ACPI_FAILURE(status)) {
 628                 printk(KERN_ERR PREFIX "Unable to load the System Description Tables\n");
 629                 goto error0;
 630         }
 631
 632         /*
 633          * Get a separate copy of the FADT for use by other drivers.
 634          */
 635         status = acpi_get_table(ACPI_TABLE_FADT, 1, &buffer);
 636         if (ACPI_FAILURE(status)) {
 637                 printk(KERN_ERR PREFIX "Unable to get the FADT\n");
 638                 goto error0;
 639         }
 640
 641 #ifdef CONFIG_X86
 642         if (!acpi_ioapic) {
 643                 extern acpi_interrupt_flags acpi_sci_flags;
 644
 645                 /* compatible (0) means level (3) */
 646                 if (acpi_sci_flags.trigger == 0)
 647                         acpi_sci_flags.trigger = 3;
 648
 649                 /* Set PIC-mode SCI trigger type */
 650                 acpi_pic_sci_set_trigger(acpi_fadt.sci_int, acpi_sci_flags.trigger);
 651         } else {
 652                 extern int acpi_sci_override_gsi;
 653                 /*
 654                  * now that acpi_fadt is initialized,
 655                  * update it with result from INT_SRC_OVR parsing
 656                  */
 657                 acpi_fadt.sci_int = acpi_sci_override_gsi;
 658         }
 659 #endif
 660
 661         status = acpi_enable_subsystem(~(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE));
 662         if (ACPI_FAILURE(status)) {
 663                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 664                 goto error0;
 665         }
 666
 667         return_VOID;
 668
 669 error0:
 670         disable_acpi();
 671         return_VOID;
 672 }
 673
 674 static int __init
 675 acpi_bus_init (void)
 676 {
 677         int                     result = 0;
 678         acpi_status             status = AE_OK;
 679         extern acpi_status      acpi_os_initialize1(void);
 680
 681         ACPI_FUNCTION_TRACE("acpi_bus_init");
 682
 683         status = acpi_os_initialize1();
 684
 685         status = acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 686         if (ACPI_FAILURE(status)) {
 687                 printk(KERN_ERR PREFIX "Unable to start the ACPI Interpreter\n");
 688                 goto error1;
 689         }
 690
 691         if (ACPI_FAILURE(status)) {
 692                 printk(KERN_ERR PREFIX "Unable to initialize ACPI OS objects\n");
 693                 goto error1;
 694         }
 695 #ifdef CONFIG_ACPI_EC
 696         /*
 697          * ACPI 2.0 requires the EC driver to be loaded and work before
 698          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 699          * is called).
 700          *
 701          * This is accomplished by looking for the ECDT table, and getting
 702          * the EC parameters out of that.
 703          */
 704         status = acpi_ec_ecdt_probe();
 705         /* Ignore result. Not having an ECDT is not fatal. */
 706 #endif
 707
 708         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 709         if (ACPI_FAILURE(status)) {
 710                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 711                 goto error1;
 712         }
 713
 714         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 715
 716         /*
 717          * Get the system interrupt model and evaluate \_PIC.
 718          */
 719         result = acpi_bus_init_irq();
 720         if (result)
 721                 goto error1;
 722
 723         /*
 724          * Register the for all standard device notifications.
 725          */
 726         status = acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, &acpi_bus_notify, NULL);
 727         if (ACPI_FAILURE(status)) {
 728                 printk(KERN_ERR PREFIX "Unable to register for device notifications\n");
 729                 goto error1;
 730         }
 731
 732         /*
 733          * Create the top ACPI proc directory
 734          */
 735         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 736
 737         return_VALUE(0);
 738
 739         /* Mimic structured exception handling */
 740 error1:
 741         acpi_terminate();
 742         return_VALUE(-ENODEV);
 743 }
 744
 745 decl_subsys(acpi,NULL,NULL);
 746
 747 static int __init acpi_init (void)
 748 {
 749         int                     result = 0;
 750
 751         ACPI_FUNCTION_TRACE("acpi_init");
 752
 753         printk(KERN_INFO PREFIX "Subsystem revision %08x\n",
 754                 ACPI_CA_VERSION);
 755
 756         if (acpi_disabled) {
 757                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 758                 return_VALUE(-ENODEV);
 759         }
 760
 761         firmware_register(&acpi_subsys);
 762
 763         result = acpi_bus_init();
 764
 765         if (!result) {
 766 #ifdef CONFIG_PM
 767                 if (!PM_IS_ACTIVE())
 768                         pm_active = 1;
 769                 else {
 770                         printk(KERN_INFO PREFIX "APM is already active, exiting\n");
 771                         disable_acpi();
 772                         result = -ENODEV;
 773                 }
 774 #endif
 775         } else
 776                 disable_acpi();
 777
 778         return_VALUE(result);
 779 }
 780
 781 subsys_initcall(acpi_init);