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 static int set_power_nocheck(const struct dmi_system_id *id)
  52 {
  53         printk(KERN_NOTICE PREFIX "%s detected - "
  54                 "disable power check in power transistion\n", id->ident);
  55         acpi_power_nocheck = 1;
  56         return 0;
  57 }
  58 static struct dmi_system_id __cpuinitdata power_nocheck_dmi_table[] = {
  59         {
  60         set_power_nocheck, "HP Pavilion 05", {
  61         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
  62         DMI_MATCH(DMI_SYS_VENDOR, "HP Pavilion 05"),
  63         DMI_MATCH(DMI_PRODUCT_VERSION, "2001211RE101GLEND") }, NULL},
  64         {},
  65 };
  66
  67
  68 /* --------------------------------------------------------------------------
  69                                 Device Management
  70    -------------------------------------------------------------------------- */
  71
  72 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
  73 {
  74         acpi_status status = AE_OK;
  75
  76
  77         if (!device)
  78                 return -EINVAL;
  79
  80         /* TBD: Support fixed-feature devices */
  81
  82         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
  83         if (ACPI_FAILURE(status) || !*device) {
  84                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
  85                                   handle));
  86                 return -ENODEV;
  87         }
  88
  89         return 0;
  90 }
  91
  92 EXPORT_SYMBOL(acpi_bus_get_device);
  93
  94 int acpi_bus_get_status(struct acpi_device *device)
  95 {
  96         acpi_status status = AE_OK;
  97         unsigned long sta = 0;
  98
  99
 100         if (!device)
 101                 return -EINVAL;
 102
 103         /*
 104          * Evaluate _STA if present.
 105          */
 106         if (device->flags.dynamic_status) {
 107                 status =
 108                     acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
 109                 if (ACPI_FAILURE(status))
 110                         return -ENODEV;
 111                 STRUCT_TO_INT(device->status) = (int)sta;
 112         }
 113
 114         /*
 115          * According to ACPI spec some device can be present and functional
 116          * even if the parent is not present but functional.
 117          * In such conditions the child device should not inherit the status
 118          * from the parent.
 119          */
 120         else
 121                 STRUCT_TO_INT(device->status) =
 122                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 123                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 124
 125         if (device->status.functional && !device->status.present) {
 126                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 127                        "functional but not present;\n",
 128                         device->pnp.bus_id,
 129                         (u32) STRUCT_TO_INT(device->status)));
 130         }
 131
 132         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 133                           device->pnp.bus_id,
 134                           (u32) STRUCT_TO_INT(device->status)));
 135
 136         return 0;
 137 }
 138
 139 EXPORT_SYMBOL(acpi_bus_get_status);
 140
 141 void acpi_bus_private_data_handler(acpi_handle handle,
 142                                    u32 function, void *context)
 143 {
 144         return;
 145 }
 146 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 147
 148 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 149 {
 150         acpi_status status = AE_OK;
 151
 152         if (!*data)
 153                 return -EINVAL;
 154
 155         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 156         if (ACPI_FAILURE(status) || !*data) {
 157                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 158                                 handle));
 159                 return -ENODEV;
 160         }
 161
 162         return 0;
 163 }
 164 EXPORT_SYMBOL(acpi_bus_get_private_data);
 165
 166 /* --------------------------------------------------------------------------
 167                                  Power Management
 168    -------------------------------------------------------------------------- */
 169
 170 int acpi_bus_get_power(acpi_handle handle, int *state)
 171 {
 172         int result = 0;
 173         acpi_status status = 0;
 174         struct acpi_device *device = NULL;
 175         unsigned long psc = 0;
 176
 177
 178         result = acpi_bus_get_device(handle, &device);
 179         if (result)
 180                 return result;
 181
 182         *state = ACPI_STATE_UNKNOWN;
 183
 184         if (!device->flags.power_manageable) {
 185                 /* TBD: Non-recursive algorithm for walking up hierarchy */
 186                 if (device->parent)
 187                         *state = device->parent->power.state;
 188                 else
 189                         *state = ACPI_STATE_D0;
 190         } else {
 191                 /*
 192                  * Get the device's power state either directly (via _PSC) or
 193                  * indirectly (via power resources).
 194                  */
 195                 if (device->power.flags.explicit_get) {
 196                         status = acpi_evaluate_integer(device->handle, "_PSC",
 197                                                        NULL, &psc);
 198                         if (ACPI_FAILURE(status))
 199                                 return -ENODEV;
 200                         device->power.state = (int)psc;
 201                 } else if (device->power.flags.power_resources) {
 202                         result = acpi_power_get_inferred_state(device);
 203                         if (result)
 204                                 return result;
 205                 }
 206
 207                 *state = device->power.state;
 208         }
 209
 210         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
 211                           device->pnp.bus_id, device->power.state));
 212
 213         return 0;
 214 }
 215
 216 EXPORT_SYMBOL(acpi_bus_get_power);
 217
 218 int acpi_bus_set_power(acpi_handle handle, int state)
 219 {
 220         int result = 0;
 221         acpi_status status = AE_OK;
 222         struct acpi_device *device = NULL;
 223         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 224
 225
 226         result = acpi_bus_get_device(handle, &device);
 227         if (result)
 228                 return result;
 229
 230         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
 231                 return -EINVAL;
 232
 233         /* Make sure this is a valid target state */
 234
 235         if (!device->flags.power_manageable) {
 236                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
 237                                 kobject_name(&device->dev.kobj)));
 238                 return -ENODEV;
 239         }
 240         /*
 241          * Get device's current power state
 242          */
 243         if (!acpi_power_nocheck) {
 244                 /*
 245                  * Maybe the incorrect power state is returned on the bogus
 246                  * bios, which is different with the real power state.
 247                  * For example: the bios returns D0 state and the real power
 248                  * state is D3. OS expects to set the device to D0 state. In
 249                  * such case if OS uses the power state returned by the BIOS,
 250                  * the device can't be transisted to the correct power state.
 251                  * So if the acpi_power_nocheck is set, it is unnecessary to
 252                  * get the power state by calling acpi_bus_get_power.
 253                  */
 254                 acpi_bus_get_power(device->handle, &device->power.state);
 255         }
 256         if ((state == device->power.state) && !device->flags.force_power_state) {
 257                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
 258                                   state));
 259                 return 0;
 260         }
 261
 262         if (!device->power.states[state].flags.valid) {
 263                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
 264                 return -ENODEV;
 265         }
 266         if (device->parent && (state < device->parent->power.state)) {
 267                 printk(KERN_WARNING PREFIX
 268                               "Cannot set device to a higher-powered"
 269                               " state than parent\n");
 270                 return -ENODEV;
 271         }
 272
 273         /*
 274          * Transition Power
 275          * ----------------
 276          * On transitions to a high-powered state we first apply power (via
 277          * power resources) then evalute _PSx.  Conversly for transitions to
 278          * a lower-powered state.
 279          */
 280         if (state < device->power.state) {
 281                 if (device->power.flags.power_resources) {
 282                         result = acpi_power_transition(device, state);
 283                         if (result)
 284                                 goto end;
 285                 }
 286                 if (device->power.states[state].flags.explicit_set) {
 287                         status = acpi_evaluate_object(device->handle,
 288                                                       object_name, NULL, NULL);
 289                         if (ACPI_FAILURE(status)) {
 290                                 result = -ENODEV;
 291                                 goto end;
 292                         }
 293                 }
 294         } else {
 295                 if (device->power.states[state].flags.explicit_set) {
 296                         status = acpi_evaluate_object(device->handle,
 297                                                       object_name, NULL, NULL);
 298                         if (ACPI_FAILURE(status)) {
 299                                 result = -ENODEV;
 300                                 goto end;
 301                         }
 302                 }
 303                 if (device->power.flags.power_resources) {
 304                         result = acpi_power_transition(device, state);
 305                         if (result)
 306                                 goto end;
 307                 }
 308         }
 309
 310       end:
 311         if (result)
 312                 printk(KERN_WARNING PREFIX
 313                               "Transitioning device [%s] to D%d\n",
 314                               device->pnp.bus_id, state);
 315         else {
 316                 device->power.state = state;
 317                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 318                                   "Device [%s] transitioned to D%d\n",
 319                                   device->pnp.bus_id, state));
 320         }
 321
 322         return result;
 323 }
 324
 325 EXPORT_SYMBOL(acpi_bus_set_power);
 326
 327 bool acpi_bus_power_manageable(acpi_handle handle)
 328 {
 329         struct acpi_device *device;
 330         int result;
 331
 332         result = acpi_bus_get_device(handle, &device);
 333         return result ? false : device->flags.power_manageable;
 334 }
 335
 336 EXPORT_SYMBOL(acpi_bus_power_manageable);
 337
 338 bool acpi_bus_can_wakeup(acpi_handle handle)
 339 {
 340         struct acpi_device *device;
 341         int result;
 342
 343         result = acpi_bus_get_device(handle, &device);
 344         return result ? false : device->wakeup.flags.valid;
 345 }
 346
 347 EXPORT_SYMBOL(acpi_bus_can_wakeup);
 348
 349 /* --------------------------------------------------------------------------
 350                                 Event Management
 351    -------------------------------------------------------------------------- */
 352
 353 #ifdef CONFIG_ACPI_PROC_EVENT
 354 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 355
 356 LIST_HEAD(acpi_bus_event_list);
 357 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 358
 359 extern int event_is_open;
 360
 361 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 362 {
 363         struct acpi_bus_event *event;
 364         unsigned long flags = 0;
 365
 366         /* drop event on the floor if no one's listening */
 367         if (!event_is_open)
 368                 return 0;
 369
 370         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 371         if (!event)
 372                 return -ENOMEM;
 373
 374         strcpy(event->device_class, device_class);
 375         strcpy(event->bus_id, bus_id);
 376         event->type = type;
 377         event->data = data;
 378
 379         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 380         list_add_tail(&event->node, &acpi_bus_event_list);
 381         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 382
 383         wake_up_interruptible(&acpi_bus_event_queue);
 384
 385         return 0;
 386
 387 }
 388
 389 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 390
 391 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 392 {
 393         if (!device)
 394                 return -EINVAL;
 395         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 396                                              device->pnp.bus_id, type, data);
 397 }
 398
 399 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 400
 401 int acpi_bus_receive_event(struct acpi_bus_event *event)
 402 {
 403         unsigned long flags = 0;
 404         struct acpi_bus_event *entry = NULL;
 405
 406         DECLARE_WAITQUEUE(wait, current);
 407
 408
 409         if (!event)
 410                 return -EINVAL;
 411
 412         if (list_empty(&acpi_bus_event_list)) {
 413
 414                 set_current_state(TASK_INTERRUPTIBLE);
 415                 add_wait_queue(&acpi_bus_event_queue, &wait);
 416
 417                 if (list_empty(&acpi_bus_event_list))
 418                         schedule();
 419
 420                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 421                 set_current_state(TASK_RUNNING);
 422
 423                 if (signal_pending(current))
 424                         return -ERESTARTSYS;
 425         }
 426
 427         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 428         if (!list_empty(&acpi_bus_event_list)) {
 429                 entry = list_entry(acpi_bus_event_list.next,
 430                                    struct acpi_bus_event, node);
 431                 list_del(&entry->node);
 432         }
 433         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 434
 435         if (!entry)
 436                 return -ENODEV;
 437
 438         memcpy(event, entry, sizeof(struct acpi_bus_event));
 439
 440         kfree(entry);
 441
 442         return 0;
 443 }
 444
 445 #endif  /* CONFIG_ACPI_PROC_EVENT */
 446
 447 /* --------------------------------------------------------------------------
 448                              Notification Handling
 449    -------------------------------------------------------------------------- */
 450
 451 static int
 452 acpi_bus_check_device(struct acpi_device *device, int *status_changed)
 453 {
 454         acpi_status status = 0;
 455         struct acpi_device_status old_status;
 456
 457
 458         if (!device)
 459                 return -EINVAL;
 460
 461         if (status_changed)
 462                 *status_changed = 0;
 463
 464         old_status = device->status;
 465
 466         /*
 467          * Make sure this device's parent is present before we go about
 468          * messing with the device.
 469          */
 470         if (device->parent && !device->parent->status.present) {
 471                 device->status = device->parent->status;
 472                 if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
 473                         if (status_changed)
 474                                 *status_changed = 1;
 475                 }
 476                 return 0;
 477         }
 478
 479         status = acpi_bus_get_status(device);
 480         if (ACPI_FAILURE(status))
 481                 return -ENODEV;
 482
 483         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 484                 return 0;
 485
 486         if (status_changed)
 487                 *status_changed = 1;
 488
 489         /*
 490          * Device Insertion/Removal
 491          */
 492         if ((device->status.present) && !(old_status.present)) {
 493                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 494                 /* TBD: Handle device insertion */
 495         } else if (!(device->status.present) && (old_status.present)) {
 496                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 497                 /* TBD: Handle device removal */
 498         }
 499
 500         return 0;
 501 }
 502
 503 static int acpi_bus_check_scope(struct acpi_device *device)
 504 {
 505         int result = 0;
 506         int status_changed = 0;
 507
 508
 509         if (!device)
 510                 return -EINVAL;
 511
 512         /* Status Change? */
 513         result = acpi_bus_check_device(device, &status_changed);
 514         if (result)
 515                 return result;
 516
 517         if (!status_changed)
 518                 return 0;
 519
 520         /*
 521          * TBD: Enumerate child devices within this device's scope and
 522          *       run acpi_bus_check_device()'s on them.
 523          */
 524
 525         return 0;
 526 }
 527
 528 /**
 529  * acpi_bus_notify
 530  * ---------------
 531  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 532  */
 533 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 534 {
 535         int result = 0;
 536         struct acpi_device *device = NULL;
 537
 538
 539         if (acpi_bus_get_device(handle, &device))
 540                 return;
 541
 542         switch (type) {
 543
 544         case ACPI_NOTIFY_BUS_CHECK:
 545                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 546                                   "Received BUS CHECK notification for device [%s]\n",
 547                                   device->pnp.bus_id));
 548                 result = acpi_bus_check_scope(device);
 549                 /*
 550                  * TBD: We'll need to outsource certain events to non-ACPI
 551                  *      drivers via the device manager (device.c).
 552                  */
 553                 break;
 554
 555         case ACPI_NOTIFY_DEVICE_CHECK:
 556                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 557                                   "Received DEVICE CHECK notification for device [%s]\n",
 558                                   device->pnp.bus_id));
 559                 result = acpi_bus_check_device(device, NULL);
 560                 /*
 561                  * TBD: We'll need to outsource certain events to non-ACPI
 562                  *      drivers via the device manager (device.c).
 563                  */
 564                 break;
 565
 566         case ACPI_NOTIFY_DEVICE_WAKE:
 567                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 568                                   "Received DEVICE WAKE notification for device [%s]\n",
 569                                   device->pnp.bus_id));
 570                 /* TBD */
 571                 break;
 572
 573         case ACPI_NOTIFY_EJECT_REQUEST:
 574                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 575                                   "Received EJECT REQUEST notification for device [%s]\n",
 576                                   device->pnp.bus_id));
 577                 /* TBD */
 578                 break;
 579
 580         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 581                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 582                                   "Received DEVICE CHECK LIGHT notification for device [%s]\n",
 583                                   device->pnp.bus_id));
 584                 /* TBD: Exactly what does 'light' mean? */
 585                 break;
 586
 587         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 588                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 589                                   "Received FREQUENCY MISMATCH notification for device [%s]\n",
 590                                   device->pnp.bus_id));
 591                 /* TBD */
 592                 break;
 593
 594         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 595                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 596                                   "Received BUS MODE MISMATCH notification for device [%s]\n",
 597                                   device->pnp.bus_id));
 598                 /* TBD */
 599                 break;
 600
 601         case ACPI_NOTIFY_POWER_FAULT:
 602                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 603                                   "Received POWER FAULT notification for device [%s]\n",
 604                                   device->pnp.bus_id));
 605                 /* TBD */
 606                 break;
 607
 608         default:
 609                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 610                                   "Received unknown/unsupported notification [%08x]\n",
 611                                   type));
 612                 break;
 613         }
 614
 615         return;
 616 }
 617
 618 /* --------------------------------------------------------------------------
 619                              Initialization/Cleanup
 620    -------------------------------------------------------------------------- */
 621
 622 static int __init acpi_bus_init_irq(void)
 623 {
 624         acpi_status status = AE_OK;
 625         union acpi_object arg = { ACPI_TYPE_INTEGER };
 626         struct acpi_object_list arg_list = { 1, &arg };
 627         char *message = NULL;
 628
 629
 630         /*
 631          * Let the system know what interrupt model we are using by
 632          * evaluating the \_PIC object, if exists.
 633          */
 634
 635         switch (acpi_irq_model) {
 636         case ACPI_IRQ_MODEL_PIC:
 637                 message = "PIC";
 638                 break;
 639         case ACPI_IRQ_MODEL_IOAPIC:
 640                 message = "IOAPIC";
 641                 break;
 642         case ACPI_IRQ_MODEL_IOSAPIC:
 643                 message = "IOSAPIC";
 644                 break;
 645         case ACPI_IRQ_MODEL_PLATFORM:
 646                 message = "platform specific model";
 647                 break;
 648         default:
 649                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 650                 return -ENODEV;
 651         }
 652
 653         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 654
 655         arg.integer.value = acpi_irq_model;
 656
 657         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 658         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 659                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 660                 return -ENODEV;
 661         }
 662
 663         return 0;
 664 }
 665
 666 u8 acpi_gbl_permanent_mmap;
 667
 668
 669 void __init acpi_early_init(void)
 670 {
 671         acpi_status status = AE_OK;
 672
 673         if (acpi_disabled)
 674                 return;
 675
 676         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 677
 678         /* enable workarounds, unless strict ACPI spec. compliance */
 679         if (!acpi_strict)
 680                 acpi_gbl_enable_interpreter_slack = TRUE;
 681
 682         acpi_gbl_permanent_mmap = 1;
 683
 684         status = acpi_reallocate_root_table();
 685         if (ACPI_FAILURE(status)) {
 686                 printk(KERN_ERR PREFIX
 687                        "Unable to reallocate ACPI tables\n");
 688                 goto error0;
 689         }
 690
 691         status = acpi_initialize_subsystem();
 692         if (ACPI_FAILURE(status)) {
 693                 printk(KERN_ERR PREFIX
 694                        "Unable to initialize the ACPI Interpreter\n");
 695                 goto error0;
 696         }
 697
 698         status = acpi_load_tables();
 699         if (ACPI_FAILURE(status)) {
 700                 printk(KERN_ERR PREFIX
 701                        "Unable to load the System Description Tables\n");
 702                 goto error0;
 703         }
 704
 705 #ifdef CONFIG_X86
 706         if (!acpi_ioapic) {
 707                 /* compatible (0) means level (3) */
 708                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 709                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 710                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 711                 }
 712                 /* Set PIC-mode SCI trigger type */
 713                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 714                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 715         } else {
 716                 /*
 717                  * now that acpi_gbl_FADT is initialized,
 718                  * update it with result from INT_SRC_OVR parsing
 719                  */
 720                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 721         }
 722 #endif
 723
 724         status =
 725             acpi_enable_subsystem(~
 726                                   (ACPI_NO_HARDWARE_INIT |
 727                                    ACPI_NO_ACPI_ENABLE));
 728         if (ACPI_FAILURE(status)) {
 729                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 730                 goto error0;
 731         }
 732
 733         return;
 734
 735       error0:
 736         disable_acpi();
 737         return;
 738 }
 739
 740 static int __init acpi_bus_init(void)
 741 {
 742         int result = 0;
 743         acpi_status status = AE_OK;
 744         extern acpi_status acpi_os_initialize1(void);
 745
 746
 747         status = acpi_os_initialize1();
 748
 749         status =
 750             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 751         if (ACPI_FAILURE(status)) {
 752                 printk(KERN_ERR PREFIX
 753                        "Unable to start the ACPI Interpreter\n");
 754                 goto error1;
 755         }
 756
 757         if (ACPI_FAILURE(status)) {
 758                 printk(KERN_ERR PREFIX
 759                        "Unable to initialize ACPI OS objects\n");
 760                 goto error1;
 761         }
 762 #ifdef CONFIG_ACPI_EC
 763         /*
 764          * ACPI 2.0 requires the EC driver to be loaded and work before
 765          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 766          * is called).
 767          *
 768          * This is accomplished by looking for the ECDT table, and getting
 769          * the EC parameters out of that.
 770          */
 771         status = acpi_ec_ecdt_probe();
 772         /* Ignore result. Not having an ECDT is not fatal. */
 773 #endif
 774
 775         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 776         if (ACPI_FAILURE(status)) {
 777                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 778                 goto error1;
 779         }
 780
 781         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 782
 783         /* Initialize sleep structures */
 784         acpi_sleep_init();
 785
 786         /*
 787          * Get the system interrupt model and evaluate \_PIC.
 788          */
 789         result = acpi_bus_init_irq();
 790         if (result)
 791                 goto error1;
 792
 793         /*
 794          * Register the for all standard device notifications.
 795          */
 796         status =
 797             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 798                                         &acpi_bus_notify, NULL);
 799         if (ACPI_FAILURE(status)) {
 800                 printk(KERN_ERR PREFIX
 801                        "Unable to register for device notifications\n");
 802                 goto error1;
 803         }
 804
 805         /*
 806          * Create the top ACPI proc directory
 807          */
 808         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 809
 810         return 0;
 811
 812         /* Mimic structured exception handling */
 813       error1:
 814         acpi_terminate();
 815         return -ENODEV;
 816 }
 817
 818 struct kobject *acpi_kobj;
 819
 820 static int __init acpi_init(void)
 821 {
 822         int result = 0;
 823
 824
 825         if (acpi_disabled) {
 826                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 827                 return -ENODEV;
 828         }
 829
 830         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
 831         if (!acpi_kobj) {
 832                 printk(KERN_WARNING "%s: kset create error\n", __func__);
 833                 acpi_kobj = NULL;
 834         }
 835
 836         result = acpi_bus_init();
 837
 838         if (!result) {
 839                 pci_mmcfg_late_init();
 840                 if (!(pm_flags & PM_APM))
 841                         pm_flags |= PM_ACPI;
 842                 else {
 843                         printk(KERN_INFO PREFIX
 844                                "APM is already active, exiting\n");
 845                         disable_acpi();
 846                         result = -ENODEV;
 847                 }
 848         } else
 849                 disable_acpi();
 850         /*
 851          * If the laptop falls into the DMI check table, the power state check
 852          * will be disabled in the course of device power transistion.
 853          */
 854         dmi_check_system(power_nocheck_dmi_table);
 855         return result;
 856 }
 857
 858 subsys_initcall(acpi_init);