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