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/init.h>
  26 #include <linux/ioport.h>
  27 #include <linux/list.h>
  28 #include <linux/sched.h>
  29 #include <linux/pm.h>
  30 #include <linux/device.h>
  31 #include <linux/proc_fs.h>
  32 #include <linux/reboot.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 struct acpi_device              *acpi_root;
  49 struct proc_dir_entry           *acpi_root_dir;
  50
  51 #define STRUCT_TO_INT(s)        (*((int*)&s))
  52
  53 /* --------------------------------------------------------------------------
  54                                 Device Management
  55    -------------------------------------------------------------------------- */
  56
  57 extern void acpi_bus_data_handler (
  58         acpi_handle             handle,
  59         u32                     function,
  60         void                    *context);
  61 int
  62 acpi_bus_get_device (
  63         acpi_handle             handle,
  64         struct acpi_device      **device)
  65 {
  66         acpi_status             status = AE_OK;
  67
  68         ACPI_FUNCTION_TRACE("acpi_bus_get_device");
  69
  70         if (!device)
  71                 return_VALUE(-EINVAL);
  72
  73         /* TBD: Support fixed-feature devices */
  74
  75         status = acpi_get_data(handle, acpi_bus_data_handler, (void**) device);
  76         if (ACPI_FAILURE(status) || !*device) {
  77                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Error getting context for object [%p]\n",
  78                         handle));
  79                 return_VALUE(-ENODEV);
  80         }
  81
  82         return_VALUE(0);
  83 }
  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
 130
 131 /* --------------------------------------------------------------------------
 132                                  Power Management
 133    -------------------------------------------------------------------------- */
 134
 135 int
 136 acpi_bus_get_power (
 137         acpi_handle             handle,
 138         int                     *state)
 139 {
 140         int                     result = 0;
 141         acpi_status             status = 0;
 142         struct acpi_device      *device = NULL;
 143         unsigned long           psc = 0;
 144
 145         ACPI_FUNCTION_TRACE("acpi_bus_get_power");
 146
 147         result = acpi_bus_get_device(handle, &device);
 148         if (result)
 149                 return_VALUE(result);
 150
 151         *state = ACPI_STATE_UNKNOWN;
 152
 153         if (!device->flags.power_manageable) {
 154                 /* TBD: Non-recursive algorithm for walking up hierarchy */
 155                 if (device->parent)
 156                         *state = device->parent->power.state;
 157                 else
 158                         *state = ACPI_STATE_D0;
 159         }
 160         else {
 161                 /*
 162                  * Get the device's power state either directly (via _PSC) or
 163                  * indirectly (via power resources).
 164                  */
 165                 if (device->power.flags.explicit_get) {
 166                         status = acpi_evaluate_integer(device->handle, "_PSC",
 167                                 NULL, &psc);
 168                         if (ACPI_FAILURE(status))
 169                                 return_VALUE(-ENODEV);
 170                         device->power.state = (int) psc;
 171                 }
 172                 else if (device->power.flags.power_resources) {
 173                         result = acpi_power_get_inferred_state(device);
 174                         if (result)
 175                                 return_VALUE(result);
 176                 }
 177
 178                 *state = device->power.state;
 179         }
 180
 181         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
 182                 device->pnp.bus_id, device->power.state));
 183
 184         return_VALUE(0);
 185 }
 186
 187
 188 int
 189 acpi_bus_set_power (
 190         acpi_handle             handle,
 191         int                     state)
 192 {
 193         int                     result = 0;
 194         acpi_status             status = AE_OK;
 195         struct acpi_device      *device = NULL;
 196         char                    object_name[5] = {'_','P','S','0'+state,'\0'};
 197
 198         ACPI_FUNCTION_TRACE("acpi_bus_set_power");
 199
 200         result = acpi_bus_get_device(handle, &device);
 201         if (result)
 202                 return_VALUE(result);
 203
 204         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
 205                 return_VALUE(-EINVAL);
 206
 207         /* Make sure this is a valid target state */
 208
 209         if (!device->flags.power_manageable) {
 210                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Device is not power manageable\n"));
 211                 return_VALUE(-ENODEV);
 212         }
 213         if (state == device->power.state) {
 214                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n", state));
 215                 return_VALUE(0);
 216         }
 217         if (!device->power.states[state].flags.valid) {
 218                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Device does not support D%d\n", state));
 219                 return_VALUE(-ENODEV);
 220         }
 221         if (device->parent && (state < device->parent->power.state)) {
 222                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Cannot set device to a higher-powered state than parent\n"));
 223                 return_VALUE(-ENODEV);
 224         }
 225
 226         /*
 227          * Transition Power
 228          * ----------------
 229          * On transitions to a high-powered state we first apply power (via
 230          * power resources) then evalute _PSx.  Conversly for transitions to
 231          * a lower-powered state.
 232          */
 233         if (state < device->power.state) {
 234                 if (device->power.flags.power_resources) {
 235                         result = acpi_power_transition(device, state);
 236                         if (result)
 237                                 goto end;
 238                 }
 239                 if (device->power.states[state].flags.explicit_set) {
 240                         status = acpi_evaluate_object(device->handle,
 241                                 object_name, NULL, NULL);
 242                         if (ACPI_FAILURE(status)) {
 243                                 result = -ENODEV;
 244                                 goto end;
 245                         }
 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_DEBUG_PRINT((ACPI_DB_WARN, "Error transitioning device [%s] to D%d\n",
 267                         device->pnp.bus_id, state));
 268         else
 269                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] transitioned to D%d\n",
 270                         device->pnp.bus_id, state));
 271
 272         return_VALUE(result);
 273 }
 274
 275
 276
 277 /* --------------------------------------------------------------------------
 278                                 Event Management
 279    -------------------------------------------------------------------------- */
 280
 281 static spinlock_t               acpi_bus_event_lock = SPIN_LOCK_UNLOCKED;
 282
 283 LIST_HEAD(acpi_bus_event_list);
 284 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 285
 286 extern int                      event_is_open;
 287
 288 int
 289 acpi_bus_generate_event (
 290         struct acpi_device      *device,
 291         u8                      type,
 292         int                     data)
 293 {
 294         struct acpi_bus_event   *event = NULL;
 295         unsigned long           flags = 0;
 296
 297         ACPI_FUNCTION_TRACE("acpi_bus_generate_event");
 298
 299         if (!device)
 300                 return_VALUE(-EINVAL);
 301
 302         /* drop event on the floor if no one's listening */
 303         if (!event_is_open)
 304                 return_VALUE(0);
 305
 306         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 307         if (!event)
 308                 return_VALUE(-ENOMEM);
 309
 310         strcpy(event->device_class, device->pnp.device_class);
 311         strcpy(event->bus_id, device->pnp.bus_id);
 312         event->type = type;
 313         event->data = data;
 314
 315         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 316         list_add_tail(&event->node, &acpi_bus_event_list);
 317         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 318
 319         wake_up_interruptible(&acpi_bus_event_queue);
 320
 321         return_VALUE(0);
 322 }
 323
 324 int
 325 acpi_bus_receive_event (
 326         struct acpi_bus_event   *event)
 327 {
 328         unsigned long           flags = 0;
 329         struct acpi_bus_event   *entry = NULL;
 330
 331         DECLARE_WAITQUEUE(wait, current);
 332
 333         ACPI_FUNCTION_TRACE("acpi_bus_receive_event");
 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_VALUE(-ERESTARTSYS);
 351         }
 352
 353         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 354         entry = list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node);
 355         if (entry)
 356                 list_del(&entry->node);
 357         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 358
 359         if (!entry)
 360                 return_VALUE(-ENODEV);
 361
 362         memcpy(event, entry, sizeof(struct acpi_bus_event));
 363
 364         kfree(entry);
 365
 366         return_VALUE(0);
 367 }
 368
 369
 370 /* --------------------------------------------------------------------------
 371                              Notification Handling
 372    -------------------------------------------------------------------------- */
 373
 374 static int
 375 acpi_bus_check_device (
 376         struct acpi_device      *device,
 377         int                     *status_changed)
 378 {
 379         acpi_status             status = 0;
 380         struct acpi_device_status old_status;
 381
 382         ACPI_FUNCTION_TRACE("acpi_bus_check_device");
 383
 384         if (!device)
 385                 return_VALUE(-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_VALUE(0);
 403         }
 404
 405         status = acpi_bus_get_status(device);
 406         if (ACPI_FAILURE(status))
 407                 return_VALUE(-ENODEV);
 408
 409         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 410                 return_VALUE(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         }
 422         else if (!(device->status.present) && (old_status.present)) {
 423                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 424                 /* TBD: Handle device removal */
 425         }
 426
 427         return_VALUE(0);
 428 }
 429
 430
 431 static int
 432 acpi_bus_check_scope (
 433         struct acpi_device      *device)
 434 {
 435         int                     result = 0;
 436         int                     status_changed = 0;
 437
 438         ACPI_FUNCTION_TRACE("acpi_bus_check_scope");
 439
 440         if (!device)
 441                 return_VALUE(-EINVAL);
 442
 443         /* Status Change? */
 444         result = acpi_bus_check_device(device, &status_changed);
 445         if (result)
 446                 return_VALUE(result);
 447
 448         if (!status_changed)
 449                 return_VALUE(0);
 450
 451         /*
 452          * TBD: Enumerate child devices within this device's scope and
 453          *       run acpi_bus_check_device()'s on them.
 454          */
 455
 456         return_VALUE(0);
 457 }
 458
 459
 460 /**
 461  * acpi_bus_notify
 462  * ---------------
 463  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 464  */
 465 static void
 466 acpi_bus_notify (
 467         acpi_handle             handle,
 468         u32                     type,
 469         void                    *data)
 470 {
 471         int                     result = 0;
 472         struct acpi_device      *device = NULL;
 473
 474         ACPI_FUNCTION_TRACE("acpi_bus_notify");
 475
 476         if (acpi_bus_get_device(handle, &device))
 477                 return_VOID;
 478
 479         switch (type) {
 480
 481         case ACPI_NOTIFY_BUS_CHECK:
 482                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received BUS CHECK notification for device [%s]\n",
 483                         device->pnp.bus_id));
 484                 result = acpi_bus_check_scope(device);
 485                 /*
 486                  * TBD: We'll need to outsource certain events to non-ACPI
 487                  *      drivers via the device manager (device.c).
 488                  */
 489                 break;
 490
 491         case ACPI_NOTIFY_DEVICE_CHECK:
 492                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received DEVICE CHECK notification for device [%s]\n",
 493                         device->pnp.bus_id));
 494                 result = acpi_bus_check_device(device, NULL);
 495                 /*
 496                  * TBD: We'll need to outsource certain events to non-ACPI
 497                  *      drivers via the device manager (device.c).
 498                  */
 499                 break;
 500
 501         case ACPI_NOTIFY_DEVICE_WAKE:
 502                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received DEVICE WAKE notification for device [%s]\n",
 503                         device->pnp.bus_id));
 504                 /* TBD */
 505                 break;
 506
 507         case ACPI_NOTIFY_EJECT_REQUEST:
 508                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received EJECT REQUEST notification for device [%s]\n",
 509                         device->pnp.bus_id));
 510                 /* TBD */
 511                 break;
 512
 513         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 514                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received DEVICE CHECK LIGHT notification for device [%s]\n",
 515                         device->pnp.bus_id));
 516                 /* TBD: Exactly what does 'light' mean? */
 517                 break;
 518
 519         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 520                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received FREQUENCY MISMATCH notification for device [%s]\n",
 521                         device->pnp.bus_id));
 522                 /* TBD */
 523                 break;
 524
 525         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 526                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received BUS MODE MISMATCH notification for device [%s]\n",
 527                         device->pnp.bus_id));
 528                 /* TBD */
 529                 break;
 530
 531         case ACPI_NOTIFY_POWER_FAULT:
 532                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received POWER FAULT notification for device [%s]\n",
 533                         device->pnp.bus_id));
 534                 /* TBD */
 535                 break;
 536
 537         default:
 538                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received unknown/unsupported notification [%08x]\n",
 539                         type));
 540                 break;
 541         }
 542
 543         return_VOID;
 544 }
 545
 546 /* --------------------------------------------------------------------------
 547                              Initialization/Cleanup
 548    -------------------------------------------------------------------------- */
 549
 550 static int __init
 551 acpi_bus_init_irq (void)
 552 {
 553         acpi_status             status = AE_OK;
 554         union acpi_object       arg = {ACPI_TYPE_INTEGER};
 555         struct acpi_object_list arg_list = {1, &arg};
 556         char                    *message = NULL;
 557
 558         ACPI_FUNCTION_TRACE("acpi_bus_init_irq");
 559
 560         /*
 561          * Let the system know what interrupt model we are using by
 562          * evaluating the \_PIC object, if exists.
 563          */
 564
 565         switch (acpi_irq_model) {
 566         case ACPI_IRQ_MODEL_PIC:
 567                 message = "PIC";
 568                 break;
 569         case ACPI_IRQ_MODEL_IOAPIC:
 570                 message = "IOAPIC";
 571                 break;
 572         case ACPI_IRQ_MODEL_IOSAPIC:
 573                 message = "IOSAPIC";
 574                 break;
 575         default:
 576                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 577                 return_VALUE(-ENODEV);
 578         }
 579
 580         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 581
 582         arg.integer.value = acpi_irq_model;
 583
 584         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 585         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 586                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PIC\n"));
 587                 return_VALUE(-ENODEV);
 588         }
 589
 590         return_VALUE(0);
 591 }
 592
 593 void
 594 acpi_machine_reset(void)
 595 {
 596         acpi_status status;
 597         FADT_DESCRIPTOR *f = &acpi_fadt;
 598
 599         if (f->reset_register.register_bit_width != 8) {
 600                 printk(KERN_WARNING PREFIX "invalid reset register bit width: 0x%x\n", f->reset_register.register_bit_width);
 601                 return_VOID;
 602         }
 603
 604         if (f->reset_register.register_bit_offset != 0) {
 605                 printk(KERN_WARNING PREFIX "invalid reset register bit offset: 0x%x\n", f->reset_register.register_bit_offset);
 606                 return_VOID;
 607         }
 608
 609         if ((f->reset_register.address_space_id != ACPI_ADR_SPACE_SYSTEM_IO) &&
 610                 (f->reset_register.address_space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) &&
 611                 (f->reset_register.address_space_id != ACPI_ADR_SPACE_PCI_CONFIG)) {
 612                 printk(KERN_WARNING PREFIX "invalid reset register address space id: 0x%x\n", f->reset_register.address_space_id);
 613                 return_VOID;
 614         }
 615
 616         status = acpi_hw_low_level_write(f->reset_register.register_bit_width, f->reset_value, &f->reset_register);
 617
 618         if (status != AE_OK)
 619                 printk(KERN_WARNING "ACPI system reset failed 0x%x\n", status);
 620 }
 621
 622 void __init
 623 acpi_early_init (void)
 624 {
 625         acpi_status             status = AE_OK;
 626         struct acpi_buffer      buffer = {sizeof(acpi_fadt), &acpi_fadt};
 627
 628         ACPI_FUNCTION_TRACE("acpi_early_init");
 629
 630         if (acpi_disabled)
 631                 return;
 632
 633         /* enable workarounds, unless strict ACPI spec. compliance */
 634         if (!acpi_strict)
 635                 acpi_gbl_enable_interpreter_slack = TRUE;
 636
 637         status = acpi_initialize_subsystem();
 638         if (ACPI_FAILURE(status)) {
 639                 printk(KERN_ERR PREFIX "Unable to initialize the ACPI Interpreter\n");
 640                 goto error0;
 641         }
 642
 643         status = acpi_load_tables();
 644         if (ACPI_FAILURE(status)) {
 645                 printk(KERN_ERR PREFIX "Unable to load the System Description Tables\n");
 646                 goto error0;
 647         }
 648
 649         /*
 650          * Get a separate copy of the FADT for use by other drivers.
 651          */
 652         status = acpi_get_table(ACPI_TABLE_FADT, 1, &buffer);
 653         if (ACPI_FAILURE(status)) {
 654                 printk(KERN_ERR PREFIX "Unable to get the FADT\n");
 655                 goto error0;
 656         }
 657
 658 #if defined(CONFIG_X86_64)
 659         /*
 660          * Set up system reset via ACPI if defined in FADT.
 661          */
 662         if (acpi_fadt.revision >= 2) {
 663                 if (acpi_fadt.reset_reg_sup) {
 664                         printk(KERN_INFO PREFIX "System reset via FADT Reset Register is supported\n");
 665                         /* if no 8042 KBD controller exists, use ACPI reset */
 666                         if (!(acpi_fadt.iapc_boot_arch & BAF_8042_KEYBOARD_CONTROLLER)) {
 667                                 machine_reset = acpi_machine_reset;
 668                                 if (!reboot_override)
 669                                         reboot_type = BOOT_ACPI;
 670                         }
 671                 }
 672         }
 673 #endif
 674
 675 #ifdef CONFIG_X86
 676         if (!acpi_ioapic) {
 677                 extern acpi_interrupt_flags acpi_sci_flags;
 678
 679                 /* compatible (0) means level (3) */
 680                 if (acpi_sci_flags.trigger == 0)
 681                         acpi_sci_flags.trigger = 3;
 682
 683                 /* Set PIC-mode SCI trigger type */
 684                 acpi_pic_sci_set_trigger(acpi_fadt.sci_int, acpi_sci_flags.trigger);
 685         } else {
 686                 extern int acpi_sci_override_gsi;
 687                 /*
 688                  * now that acpi_fadt is initialized,
 689                  * update it with result from INT_SRC_OVR parsing
 690                  */
 691                 acpi_fadt.sci_int = acpi_sci_override_gsi;
 692         }
 693 #endif
 694
 695         status = acpi_enable_subsystem(~(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE));
 696         if (ACPI_FAILURE(status)) {
 697                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 698                 goto error0;
 699         }
 700
 701         return;
 702
 703 error0:
 704         disable_acpi();
 705         return;
 706 }
 707
 708 static int __init
 709 acpi_bus_init (void)
 710 {
 711         int                     result = 0;
 712         acpi_status             status = AE_OK;
 713         extern acpi_status      acpi_os_initialize1(void);
 714
 715         ACPI_FUNCTION_TRACE("acpi_bus_init");
 716
 717         status = acpi_os_initialize1();
 718
 719         status = acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 720         if (ACPI_FAILURE(status)) {
 721                 printk(KERN_ERR PREFIX "Unable to start the ACPI Interpreter\n");
 722                 goto error1;
 723         }
 724
 725         if (ACPI_FAILURE(status)) {
 726                 printk(KERN_ERR PREFIX "Unable to initialize ACPI OS objects\n");
 727                 goto error1;
 728         }
 729 #ifdef CONFIG_ACPI_EC
 730         /*
 731          * ACPI 2.0 requires the EC driver to be loaded and work before
 732          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 733          * is called).
 734          *
 735          * This is accomplished by looking for the ECDT table, and getting
 736          * the EC parameters out of that.
 737          */
 738         status = acpi_ec_ecdt_probe();
 739         /* Ignore result. Not having an ECDT is not fatal. */
 740 #endif
 741
 742         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 743         if (ACPI_FAILURE(status)) {
 744                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 745                 goto error1;
 746         }
 747
 748         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 749
 750         /*
 751          * Get the system interrupt model and evaluate \_PIC.
 752          */
 753         result = acpi_bus_init_irq();
 754         if (result)
 755                 goto error1;
 756
 757         /*
 758          * Register the for all standard device notifications.
 759          */
 760         status = acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, &acpi_bus_notify, NULL);
 761         if (ACPI_FAILURE(status)) {
 762                 printk(KERN_ERR PREFIX "Unable to register for device notifications\n");
 763                 goto error1;
 764         }
 765
 766         /*
 767          * Create the top ACPI proc directory
 768          */
 769         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 770
 771         return_VALUE(0);
 772
 773         /* Mimic structured exception handling */
 774 error1:
 775         acpi_terminate();
 776         return_VALUE(-ENODEV);
 777 }
 778
 779 decl_subsys(acpi,NULL,NULL);
 780
 781 static int __init acpi_init (void)
 782 {
 783         int                     result = 0;
 784
 785         ACPI_FUNCTION_TRACE("acpi_init");
 786
 787         printk(KERN_INFO PREFIX "Subsystem revision %08x\n",
 788                 ACPI_CA_VERSION);
 789
 790         if (acpi_disabled) {
 791                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 792                 return -ENODEV;
 793         }
 794
 795         firmware_register(&acpi_subsys);
 796
 797         result = acpi_bus_init();
 798
 799         if (!result) {
 800 #ifdef CONFIG_PM
 801                 if (!PM_IS_ACTIVE())
 802                         pm_active = 1;
 803                 else {
 804                         printk(KERN_INFO PREFIX "APM is already active, exiting\n");
 805                         disable_acpi();
 806                         result = -ENODEV;
 807                 }
 808 #endif
 809         } else
 810                 disable_acpi();
 811
 812         return_VALUE(result);
 813 }
 814
 815 subsys_initcall(acpi_init);