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