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/kernel.h>
  29 #include <linux/list.h>
  30 #include <linux/sched.h>
  31 #include <linux/pm.h>
  32 #include <linux/device.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/acpi.h>
  35 #ifdef CONFIG_X86
  36 #include <asm/mpspec.h>
  37 #endif
  38 #include <linux/pci.h>
  39 #include <acpi/acpi_bus.h>
  40 #include <acpi/acpi_drivers.h>
  41
  42 #define _COMPONENT              ACPI_BUS_COMPONENT
  43 ACPI_MODULE_NAME("bus");
  44
  45 struct acpi_device *acpi_root;
  46 struct proc_dir_entry *acpi_root_dir;
  47 EXPORT_SYMBOL(acpi_root_dir);
  48
  49 #define STRUCT_TO_INT(s)        (*((int*)&s))
  50
  51 /* --------------------------------------------------------------------------
  52                                 Device Management
  53    -------------------------------------------------------------------------- */
  54
  55 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
  56 {
  57         acpi_status status = AE_OK;
  58
  59
  60         if (!device)
  61                 return -EINVAL;
  62
  63         /* TBD: Support fixed-feature devices */
  64
  65         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
  66         if (ACPI_FAILURE(status) || !*device) {
  67                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
  68                                   handle));
  69                 return -ENODEV;
  70         }
  71
  72         return 0;
  73 }
  74
  75 EXPORT_SYMBOL(acpi_bus_get_device);
  76
  77 int acpi_bus_get_status(struct acpi_device *device)
  78 {
  79         acpi_status status = AE_OK;
  80         unsigned long sta = 0;
  81
  82
  83         if (!device)
  84                 return -EINVAL;
  85
  86         /*
  87          * Evaluate _STA if present.
  88          */
  89         if (device->flags.dynamic_status) {
  90                 status =
  91                     acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
  92                 if (ACPI_FAILURE(status))
  93                         return -ENODEV;
  94                 STRUCT_TO_INT(device->status) = (int)sta;
  95         }
  96
  97         /*
  98          * Otherwise we assume the status of our parent (unless we don't
  99          * have one, in which case status is implied).
 100          */
 101         else if (device->parent)
 102                 device->status = device->parent->status;
 103         else
 104                 STRUCT_TO_INT(device->status) =
 105                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 106                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 107
 108         if (device->status.functional && !device->status.present) {
 109                 printk(KERN_WARNING PREFIX "Device [%s] status [%08x]: "
 110                        "functional but not present; setting present\n",
 111                        device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status));
 112                 device->status.present = 1;
 113         }
 114
 115         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 116                           device->pnp.bus_id,
 117                           (u32) STRUCT_TO_INT(device->status)));
 118
 119         return 0;
 120 }
 121
 122 EXPORT_SYMBOL(acpi_bus_get_status);
 123
 124 void acpi_bus_private_data_handler(acpi_handle handle,
 125                                    u32 function, void *context)
 126 {
 127         return;
 128 }
 129 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 130
 131 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 132 {
 133         acpi_status status = AE_OK;
 134
 135         if (!*data)
 136                 return -EINVAL;
 137
 138         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 139         if (ACPI_FAILURE(status) || !*data) {
 140                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 141                                 handle));
 142                 return -ENODEV;
 143         }
 144
 145         return 0;
 146 }
 147 EXPORT_SYMBOL(acpi_bus_get_private_data);
 148
 149 /* --------------------------------------------------------------------------
 150                                  Power Management
 151    -------------------------------------------------------------------------- */
 152
 153 int acpi_bus_get_power(acpi_handle handle, int *state)
 154 {
 155         int result = 0;
 156         acpi_status status = 0;
 157         struct acpi_device *device = NULL;
 158         unsigned long psc = 0;
 159
 160
 161         result = acpi_bus_get_device(handle, &device);
 162         if (result)
 163                 return result;
 164
 165         *state = ACPI_STATE_UNKNOWN;
 166
 167         if (!device->flags.power_manageable) {
 168                 /* TBD: Non-recursive algorithm for walking up hierarchy */
 169                 if (device->parent)
 170                         *state = device->parent->power.state;
 171                 else
 172                         *state = ACPI_STATE_D0;
 173         } else {
 174                 /*
 175                  * Get the device's power state either directly (via _PSC) or
 176                  * indirectly (via power resources).
 177                  */
 178                 if (device->power.flags.explicit_get) {
 179                         status = acpi_evaluate_integer(device->handle, "_PSC",
 180                                                        NULL, &psc);
 181                         if (ACPI_FAILURE(status))
 182                                 return -ENODEV;
 183                         device->power.state = (int)psc;
 184                 } else if (device->power.flags.power_resources) {
 185                         result = acpi_power_get_inferred_state(device);
 186                         if (result)
 187                                 return result;
 188                 }
 189
 190                 *state = device->power.state;
 191         }
 192
 193         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
 194                           device->pnp.bus_id, device->power.state));
 195
 196         return 0;
 197 }
 198
 199 EXPORT_SYMBOL(acpi_bus_get_power);
 200
 201 int acpi_bus_set_power(acpi_handle handle, int state)
 202 {
 203         int result = 0;
 204         acpi_status status = AE_OK;
 205         struct acpi_device *device = NULL;
 206         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 207
 208
 209         result = acpi_bus_get_device(handle, &device);
 210         if (result)
 211                 return result;
 212
 213         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
 214                 return -EINVAL;
 215
 216         /* Make sure this is a valid target state */
 217
 218         if (!device->flags.power_manageable) {
 219                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
 220                                 kobject_name(&device->dev.kobj)));
 221                 return -ENODEV;
 222         }
 223         /*
 224          * Get device's current power state
 225          */
 226         acpi_bus_get_power(device->handle, &device->power.state);
 227         if ((state == device->power.state) && !device->flags.force_power_state) {
 228                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
 229                                   state));
 230                 return 0;
 231         }
 232
 233         if (!device->power.states[state].flags.valid) {
 234                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
 235                 return -ENODEV;
 236         }
 237         if (device->parent && (state < device->parent->power.state)) {
 238                 printk(KERN_WARNING PREFIX
 239                               "Cannot set device to a higher-powered"
 240                               " state than parent\n");
 241                 return -ENODEV;
 242         }
 243
 244         /*
 245          * Transition Power
 246          * ----------------
 247          * On transitions to a high-powered state we first apply power (via
 248          * power resources) then evalute _PSx.  Conversly for transitions to
 249          * a lower-powered state.
 250          */
 251         if (state < device->power.state) {
 252                 if (device->power.flags.power_resources) {
 253                         result = acpi_power_transition(device, state);
 254                         if (result)
 255                                 goto end;
 256                 }
 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         } else {
 266                 if (device->power.states[state].flags.explicit_set) {
 267                         status = acpi_evaluate_object(device->handle,
 268                                                       object_name, NULL, NULL);
 269                         if (ACPI_FAILURE(status)) {
 270                                 result = -ENODEV;
 271                                 goto end;
 272                         }
 273                 }
 274                 if (device->power.flags.power_resources) {
 275                         result = acpi_power_transition(device, state);
 276                         if (result)
 277                                 goto end;
 278                 }
 279         }
 280
 281       end:
 282         if (result)
 283                 printk(KERN_WARNING PREFIX
 284                               "Transitioning device [%s] to D%d\n",
 285                               device->pnp.bus_id, state);
 286         else {
 287                 device->power.state = state;
 288                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 289                                   "Device [%s] transitioned to D%d\n",
 290                                   device->pnp.bus_id, state));
 291         }
 292
 293         return result;
 294 }
 295
 296 EXPORT_SYMBOL(acpi_bus_set_power);
 297
 298 /* --------------------------------------------------------------------------
 299                                 Event Management
 300    -------------------------------------------------------------------------- */
 301
 302 #ifdef CONFIG_ACPI_PROC_EVENT
 303 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 304
 305 LIST_HEAD(acpi_bus_event_list);
 306 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 307
 308 extern int event_is_open;
 309
 310 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 311 {
 312         struct acpi_bus_event *event;
 313         unsigned long flags = 0;
 314
 315         /* drop event on the floor if no one's listening */
 316         if (!event_is_open)
 317                 return 0;
 318
 319         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 320         if (!event)
 321                 return -ENOMEM;
 322
 323         strcpy(event->device_class, device_class);
 324         strcpy(event->bus_id, bus_id);
 325         event->type = type;
 326         event->data = data;
 327
 328         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 329         list_add_tail(&event->node, &acpi_bus_event_list);
 330         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 331
 332         wake_up_interruptible(&acpi_bus_event_queue);
 333
 334         return 0;
 335
 336 }
 337
 338 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 339
 340 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 341 {
 342         if (!device)
 343                 return -EINVAL;
 344         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 345                                              device->pnp.bus_id, type, data);
 346 }
 347
 348 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 349
 350 int acpi_bus_receive_event(struct acpi_bus_event *event)
 351 {
 352         unsigned long flags = 0;
 353         struct acpi_bus_event *entry = NULL;
 354
 355         DECLARE_WAITQUEUE(wait, current);
 356
 357
 358         if (!event)
 359                 return -EINVAL;
 360
 361         if (list_empty(&acpi_bus_event_list)) {
 362
 363                 set_current_state(TASK_INTERRUPTIBLE);
 364                 add_wait_queue(&acpi_bus_event_queue, &wait);
 365
 366                 if (list_empty(&acpi_bus_event_list))
 367                         schedule();
 368
 369                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 370                 set_current_state(TASK_RUNNING);
 371
 372                 if (signal_pending(current))
 373                         return -ERESTARTSYS;
 374         }
 375
 376         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 377         if (!list_empty(&acpi_bus_event_list)) {
 378                 entry = list_entry(acpi_bus_event_list.next,
 379                                    struct acpi_bus_event, node);
 380                 list_del(&entry->node);
 381         }
 382         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 383
 384         if (!entry)
 385                 return -ENODEV;
 386
 387         memcpy(event, entry, sizeof(struct acpi_bus_event));
 388
 389         kfree(entry);
 390
 391         return 0;
 392 }
 393
 394 #endif  /* CONFIG_ACPI_PROC_EVENT */
 395
 396 /* --------------------------------------------------------------------------
 397                              Notification Handling
 398    -------------------------------------------------------------------------- */
 399
 400 static int
 401 acpi_bus_check_device(struct acpi_device *device, int *status_changed)
 402 {
 403         acpi_status status = 0;
 404         struct acpi_device_status old_status;
 405
 406
 407         if (!device)
 408                 return -EINVAL;
 409
 410         if (status_changed)
 411                 *status_changed = 0;
 412
 413         old_status = device->status;
 414
 415         /*
 416          * Make sure this device's parent is present before we go about
 417          * messing with the device.
 418          */
 419         if (device->parent && !device->parent->status.present) {
 420                 device->status = device->parent->status;
 421                 if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
 422                         if (status_changed)
 423                                 *status_changed = 1;
 424                 }
 425                 return 0;
 426         }
 427
 428         status = acpi_bus_get_status(device);
 429         if (ACPI_FAILURE(status))
 430                 return -ENODEV;
 431
 432         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 433                 return 0;
 434
 435         if (status_changed)
 436                 *status_changed = 1;
 437
 438         /*
 439          * Device Insertion/Removal
 440          */
 441         if ((device->status.present) && !(old_status.present)) {
 442                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 443                 /* TBD: Handle device insertion */
 444         } else if (!(device->status.present) && (old_status.present)) {
 445                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 446                 /* TBD: Handle device removal */
 447         }
 448
 449         return 0;
 450 }
 451
 452 static int acpi_bus_check_scope(struct acpi_device *device)
 453 {
 454         int result = 0;
 455         int status_changed = 0;
 456
 457
 458         if (!device)
 459                 return -EINVAL;
 460
 461         /* Status Change? */
 462         result = acpi_bus_check_device(device, &status_changed);
 463         if (result)
 464                 return result;
 465
 466         if (!status_changed)
 467                 return 0;
 468
 469         /*
 470          * TBD: Enumerate child devices within this device's scope and
 471          *       run acpi_bus_check_device()'s on them.
 472          */
 473
 474         return 0;
 475 }
 476
 477 /**
 478  * acpi_bus_notify
 479  * ---------------
 480  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 481  */
 482 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 483 {
 484         int result = 0;
 485         struct acpi_device *device = NULL;
 486
 487
 488         if (acpi_bus_get_device(handle, &device))
 489                 return;
 490
 491         switch (type) {
 492
 493         case ACPI_NOTIFY_BUS_CHECK:
 494                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 495                                   "Received BUS CHECK notification for device [%s]\n",
 496                                   device->pnp.bus_id));
 497                 result = acpi_bus_check_scope(device);
 498                 /*
 499                  * TBD: We'll need to outsource certain events to non-ACPI
 500                  *      drivers via the device manager (device.c).
 501                  */
 502                 break;
 503
 504         case ACPI_NOTIFY_DEVICE_CHECK:
 505                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 506                                   "Received DEVICE CHECK notification for device [%s]\n",
 507                                   device->pnp.bus_id));
 508                 result = acpi_bus_check_device(device, NULL);
 509                 /*
 510                  * TBD: We'll need to outsource certain events to non-ACPI
 511                  *      drivers via the device manager (device.c).
 512                  */
 513                 break;
 514
 515         case ACPI_NOTIFY_DEVICE_WAKE:
 516                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 517                                   "Received DEVICE WAKE notification for device [%s]\n",
 518                                   device->pnp.bus_id));
 519                 /* TBD */
 520                 break;
 521
 522         case ACPI_NOTIFY_EJECT_REQUEST:
 523                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 524                                   "Received EJECT REQUEST notification for device [%s]\n",
 525                                   device->pnp.bus_id));
 526                 /* TBD */
 527                 break;
 528
 529         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 530                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 531                                   "Received DEVICE CHECK LIGHT notification for device [%s]\n",
 532                                   device->pnp.bus_id));
 533                 /* TBD: Exactly what does 'light' mean? */
 534                 break;
 535
 536         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 537                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 538                                   "Received FREQUENCY MISMATCH notification for device [%s]\n",
 539                                   device->pnp.bus_id));
 540                 /* TBD */
 541                 break;
 542
 543         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 544                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 545                                   "Received BUS MODE MISMATCH notification for device [%s]\n",
 546                                   device->pnp.bus_id));
 547                 /* TBD */
 548                 break;
 549
 550         case ACPI_NOTIFY_POWER_FAULT:
 551                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 552                                   "Received POWER FAULT notification for device [%s]\n",
 553                                   device->pnp.bus_id));
 554                 /* TBD */
 555                 break;
 556
 557         default:
 558                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 559                                   "Received unknown/unsupported notification [%08x]\n",
 560                                   type));
 561                 break;
 562         }
 563
 564         return;
 565 }
 566
 567 /* --------------------------------------------------------------------------
 568                              Initialization/Cleanup
 569    -------------------------------------------------------------------------- */
 570
 571 static int __init acpi_bus_init_irq(void)
 572 {
 573         acpi_status status = AE_OK;
 574         union acpi_object arg = { ACPI_TYPE_INTEGER };
 575         struct acpi_object_list arg_list = { 1, &arg };
 576         char *message = NULL;
 577
 578
 579         /*
 580          * Let the system know what interrupt model we are using by
 581          * evaluating the \_PIC object, if exists.
 582          */
 583
 584         switch (acpi_irq_model) {
 585         case ACPI_IRQ_MODEL_PIC:
 586                 message = "PIC";
 587                 break;
 588         case ACPI_IRQ_MODEL_IOAPIC:
 589                 message = "IOAPIC";
 590                 break;
 591         case ACPI_IRQ_MODEL_IOSAPIC:
 592                 message = "IOSAPIC";
 593                 break;
 594         case ACPI_IRQ_MODEL_PLATFORM:
 595                 message = "platform specific model";
 596                 break;
 597         default:
 598                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 599                 return -ENODEV;
 600         }
 601
 602         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 603
 604         arg.integer.value = acpi_irq_model;
 605
 606         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 607         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 608                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 609                 return -ENODEV;
 610         }
 611
 612         return 0;
 613 }
 614
 615 acpi_native_uint acpi_gbl_permanent_mmap;
 616
 617
 618 void __init acpi_early_init(void)
 619 {
 620         acpi_status status = AE_OK;
 621
 622         if (acpi_disabled)
 623                 return;
 624
 625         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 626
 627         /* enable workarounds, unless strict ACPI spec. compliance */
 628         if (!acpi_strict)
 629                 acpi_gbl_enable_interpreter_slack = TRUE;
 630
 631         acpi_gbl_permanent_mmap = 1;
 632
 633         status = acpi_reallocate_root_table();
 634         if (ACPI_FAILURE(status)) {
 635                 printk(KERN_ERR PREFIX
 636                        "Unable to reallocate ACPI tables\n");
 637                 goto error0;
 638         }
 639
 640         status = acpi_initialize_subsystem();
 641         if (ACPI_FAILURE(status)) {
 642                 printk(KERN_ERR PREFIX
 643                        "Unable to initialize the ACPI Interpreter\n");
 644                 goto error0;
 645         }
 646
 647         status = acpi_load_tables();
 648         if (ACPI_FAILURE(status)) {
 649                 printk(KERN_ERR PREFIX
 650                        "Unable to load the System Description Tables\n");
 651                 goto error0;
 652         }
 653
 654 #ifdef CONFIG_X86
 655         if (!acpi_ioapic) {
 656                 /* compatible (0) means level (3) */
 657                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 658                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 659                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 660                 }
 661                 /* Set PIC-mode SCI trigger type */
 662                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 663                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 664         } else {
 665                 /*
 666                  * now that acpi_gbl_FADT is initialized,
 667                  * update it with result from INT_SRC_OVR parsing
 668                  */
 669                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 670         }
 671 #endif
 672
 673         status =
 674             acpi_enable_subsystem(~
 675                                   (ACPI_NO_HARDWARE_INIT |
 676                                    ACPI_NO_ACPI_ENABLE));
 677         if (ACPI_FAILURE(status)) {
 678                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 679                 goto error0;
 680         }
 681
 682         return;
 683
 684       error0:
 685         disable_acpi();
 686         return;
 687 }
 688
 689 static int __init acpi_bus_init(void)
 690 {
 691         int result = 0;
 692         acpi_status status = AE_OK;
 693         extern acpi_status acpi_os_initialize1(void);
 694
 695
 696         status = acpi_os_initialize1();
 697
 698         status =
 699             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 700         if (ACPI_FAILURE(status)) {
 701                 printk(KERN_ERR PREFIX
 702                        "Unable to start the ACPI Interpreter\n");
 703                 goto error1;
 704         }
 705
 706         if (ACPI_FAILURE(status)) {
 707                 printk(KERN_ERR PREFIX
 708                        "Unable to initialize ACPI OS objects\n");
 709                 goto error1;
 710         }
 711 #ifdef CONFIG_ACPI_EC
 712         /*
 713          * ACPI 2.0 requires the EC driver to be loaded and work before
 714          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 715          * is called).
 716          *
 717          * This is accomplished by looking for the ECDT table, and getting
 718          * the EC parameters out of that.
 719          */
 720         status = acpi_ec_ecdt_probe();
 721         /* Ignore result. Not having an ECDT is not fatal. */
 722 #endif
 723
 724         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 725         if (ACPI_FAILURE(status)) {
 726                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 727                 goto error1;
 728         }
 729
 730         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 731
 732         /* Initialize sleep structures */
 733         acpi_sleep_init();
 734
 735         /*
 736          * Get the system interrupt model and evaluate \_PIC.
 737          */
 738         result = acpi_bus_init_irq();
 739         if (result)
 740                 goto error1;
 741
 742         /*
 743          * Register the for all standard device notifications.
 744          */
 745         status =
 746             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 747                                         &acpi_bus_notify, NULL);
 748         if (ACPI_FAILURE(status)) {
 749                 printk(KERN_ERR PREFIX
 750                        "Unable to register for device notifications\n");
 751                 goto error1;
 752         }
 753
 754         /*
 755          * Create the top ACPI proc directory
 756          */
 757         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 758
 759         return 0;
 760
 761         /* Mimic structured exception handling */
 762       error1:
 763         acpi_terminate();
 764         return -ENODEV;
 765 }
 766
 767 struct kobject *acpi_kobj;
 768
 769 static int __init acpi_init(void)
 770 {
 771         int result = 0;
 772
 773
 774         if (acpi_disabled) {
 775                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 776                 return -ENODEV;
 777         }
 778
 779         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
 780         if (!acpi_kobj) {
 781                 printk(KERN_WARNING "%s: kset create error\n", __func__);
 782                 acpi_kobj = NULL;
 783         }
 784
 785         result = acpi_bus_init();
 786
 787         if (!result) {
 788                 pci_mmcfg_late_init();
 789                 if (!(pm_flags & PM_APM))
 790                         pm_flags |= PM_ACPI;
 791                 else {
 792                         printk(KERN_INFO PREFIX
 793                                "APM is already active, exiting\n");
 794                         disable_acpi();
 795                         result = -ENODEV;
 796                 }
 797         } else
 798                 disable_acpi();
 799
 800         return result;
 801 }
 802
 803 subsys_initcall(acpi_init);