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 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 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 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 529 int register_acpi_bus_notifier(struct notifier_block *nb)
 530 {
 531         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 532 }
 533 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 534
 535 void unregister_acpi_bus_notifier(struct notifier_block *nb)
 536 {
 537         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 538 }
 539 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 540
 541 /**
 542  * acpi_bus_notify
 543  * ---------------
 544  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 545  */
 546 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 547 {
 548         int result = 0;
 549         struct acpi_device *device = NULL;
 550
 551         blocking_notifier_call_chain(&acpi_bus_notify_list,
 552                 type, (void *)handle);
 553
 554         if (acpi_bus_get_device(handle, &device))
 555                 return;
 556
 557         switch (type) {
 558
 559         case ACPI_NOTIFY_BUS_CHECK:
 560                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 561                                   "Received BUS CHECK notification for device [%s]\n",
 562                                   device->pnp.bus_id));
 563                 result = acpi_bus_check_scope(device);
 564                 /*
 565                  * TBD: We'll need to outsource certain events to non-ACPI
 566                  *      drivers via the device manager (device.c).
 567                  */
 568                 break;
 569
 570         case ACPI_NOTIFY_DEVICE_CHECK:
 571                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 572                                   "Received DEVICE CHECK notification for device [%s]\n",
 573                                   device->pnp.bus_id));
 574                 result = acpi_bus_check_device(device, NULL);
 575                 /*
 576                  * TBD: We'll need to outsource certain events to non-ACPI
 577                  *      drivers via the device manager (device.c).
 578                  */
 579                 break;
 580
 581         case ACPI_NOTIFY_DEVICE_WAKE:
 582                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 583                                   "Received DEVICE WAKE notification for device [%s]\n",
 584                                   device->pnp.bus_id));
 585                 /* TBD */
 586                 break;
 587
 588         case ACPI_NOTIFY_EJECT_REQUEST:
 589                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 590                                   "Received EJECT REQUEST notification for device [%s]\n",
 591                                   device->pnp.bus_id));
 592                 /* TBD */
 593                 break;
 594
 595         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 596                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 597                                   "Received DEVICE CHECK LIGHT notification for device [%s]\n",
 598                                   device->pnp.bus_id));
 599                 /* TBD: Exactly what does 'light' mean? */
 600                 break;
 601
 602         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 603                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 604                                   "Received FREQUENCY MISMATCH notification for device [%s]\n",
 605                                   device->pnp.bus_id));
 606                 /* TBD */
 607                 break;
 608
 609         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 610                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 611                                   "Received BUS MODE MISMATCH notification for device [%s]\n",
 612                                   device->pnp.bus_id));
 613                 /* TBD */
 614                 break;
 615
 616         case ACPI_NOTIFY_POWER_FAULT:
 617                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 618                                   "Received POWER FAULT notification for device [%s]\n",
 619                                   device->pnp.bus_id));
 620                 /* TBD */
 621                 break;
 622
 623         default:
 624                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 625                                   "Received unknown/unsupported notification [%08x]\n",
 626                                   type));
 627                 break;
 628         }
 629
 630         return;
 631 }
 632
 633 /* --------------------------------------------------------------------------
 634                              Initialization/Cleanup
 635    -------------------------------------------------------------------------- */
 636
 637 static int __init acpi_bus_init_irq(void)
 638 {
 639         acpi_status status = AE_OK;
 640         union acpi_object arg = { ACPI_TYPE_INTEGER };
 641         struct acpi_object_list arg_list = { 1, &arg };
 642         char *message = NULL;
 643
 644
 645         /*
 646          * Let the system know what interrupt model we are using by
 647          * evaluating the \_PIC object, if exists.
 648          */
 649
 650         switch (acpi_irq_model) {
 651         case ACPI_IRQ_MODEL_PIC:
 652                 message = "PIC";
 653                 break;
 654         case ACPI_IRQ_MODEL_IOAPIC:
 655                 message = "IOAPIC";
 656                 break;
 657         case ACPI_IRQ_MODEL_IOSAPIC:
 658                 message = "IOSAPIC";
 659                 break;
 660         case ACPI_IRQ_MODEL_PLATFORM:
 661                 message = "platform specific model";
 662                 break;
 663         default:
 664                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 665                 return -ENODEV;
 666         }
 667
 668         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 669
 670         arg.integer.value = acpi_irq_model;
 671
 672         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 673         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 674                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 675                 return -ENODEV;
 676         }
 677
 678         return 0;
 679 }
 680
 681 u8 acpi_gbl_permanent_mmap;
 682
 683
 684 void __init acpi_early_init(void)
 685 {
 686         acpi_status status = AE_OK;
 687
 688         if (acpi_disabled)
 689                 return;
 690
 691         /*
 692          * ACPI CA initializes acpi_dbg_level to non-zero, which means
 693          * we get debug output merely by turning on CONFIG_ACPI_DEBUG.
 694          * Turn it off so we don't get output unless the user specifies
 695          * acpi.debug_level.
 696          */
 697         acpi_dbg_level = 0;
 698
 699         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 700
 701         /* enable workarounds, unless strict ACPI spec. compliance */
 702         if (!acpi_strict)
 703                 acpi_gbl_enable_interpreter_slack = TRUE;
 704
 705         acpi_gbl_permanent_mmap = 1;
 706
 707         status = acpi_reallocate_root_table();
 708         if (ACPI_FAILURE(status)) {
 709                 printk(KERN_ERR PREFIX
 710                        "Unable to reallocate ACPI tables\n");
 711                 goto error0;
 712         }
 713
 714         status = acpi_initialize_subsystem();
 715         if (ACPI_FAILURE(status)) {
 716                 printk(KERN_ERR PREFIX
 717                        "Unable to initialize the ACPI Interpreter\n");
 718                 goto error0;
 719         }
 720
 721         status = acpi_load_tables();
 722         if (ACPI_FAILURE(status)) {
 723                 printk(KERN_ERR PREFIX
 724                        "Unable to load the System Description Tables\n");
 725                 goto error0;
 726         }
 727
 728 #ifdef CONFIG_X86
 729         if (!acpi_ioapic) {
 730                 /* compatible (0) means level (3) */
 731                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 732                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 733                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 734                 }
 735                 /* Set PIC-mode SCI trigger type */
 736                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 737                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 738         } else {
 739                 /*
 740                  * now that acpi_gbl_FADT is initialized,
 741                  * update it with result from INT_SRC_OVR parsing
 742                  */
 743                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 744         }
 745 #endif
 746
 747         status =
 748             acpi_enable_subsystem(~
 749                                   (ACPI_NO_HARDWARE_INIT |
 750                                    ACPI_NO_ACPI_ENABLE));
 751         if (ACPI_FAILURE(status)) {
 752                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 753                 goto error0;
 754         }
 755
 756         return;
 757
 758       error0:
 759         disable_acpi();
 760         return;
 761 }
 762
 763 static int __init acpi_bus_init(void)
 764 {
 765         int result = 0;
 766         acpi_status status = AE_OK;
 767         extern acpi_status acpi_os_initialize1(void);
 768
 769
 770         status = acpi_os_initialize1();
 771
 772         status =
 773             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 774         if (ACPI_FAILURE(status)) {
 775                 printk(KERN_ERR PREFIX
 776                        "Unable to start the ACPI Interpreter\n");
 777                 goto error1;
 778         }
 779
 780         if (ACPI_FAILURE(status)) {
 781                 printk(KERN_ERR PREFIX
 782                        "Unable to initialize ACPI OS objects\n");
 783                 goto error1;
 784         }
 785
 786         /*
 787          * ACPI 2.0 requires the EC driver to be loaded and work before
 788          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 789          * is called).
 790          *
 791          * This is accomplished by looking for the ECDT table, and getting
 792          * the EC parameters out of that.
 793          */
 794         status = acpi_ec_ecdt_probe();
 795         /* Ignore result. Not having an ECDT is not fatal. */
 796
 797         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 798         if (ACPI_FAILURE(status)) {
 799                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 800                 goto error1;
 801         }
 802
 803         /*
 804          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
 805          * is necessary to enable it as early as possible.
 806          */
 807         acpi_boot_ec_enable();
 808
 809         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 810
 811         /* Initialize sleep structures */
 812         acpi_sleep_init();
 813
 814         /*
 815          * Get the system interrupt model and evaluate \_PIC.
 816          */
 817         result = acpi_bus_init_irq();
 818         if (result)
 819                 goto error1;
 820
 821         /*
 822          * Register the for all standard device notifications.
 823          */
 824         status =
 825             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 826                                         &acpi_bus_notify, NULL);
 827         if (ACPI_FAILURE(status)) {
 828                 printk(KERN_ERR PREFIX
 829                        "Unable to register for device notifications\n");
 830                 goto error1;
 831         }
 832
 833         /*
 834          * Create the top ACPI proc directory
 835          */
 836         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 837
 838         return 0;
 839
 840         /* Mimic structured exception handling */
 841       error1:
 842         acpi_terminate();
 843         return -ENODEV;
 844 }
 845
 846 struct kobject *acpi_kobj;
 847
 848 static int __init acpi_init(void)
 849 {
 850         int result = 0;
 851
 852
 853         if (acpi_disabled) {
 854                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 855                 return -ENODEV;
 856         }
 857
 858         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
 859         if (!acpi_kobj) {
 860                 printk(KERN_WARNING "%s: kset create error\n", __func__);
 861                 acpi_kobj = NULL;
 862         }
 863
 864         result = acpi_bus_init();
 865
 866         if (!result) {
 867                 pci_mmcfg_late_init();
 868                 if (!(pm_flags & PM_APM))
 869                         pm_flags |= PM_ACPI;
 870                 else {
 871                         printk(KERN_INFO PREFIX
 872                                "APM is already active, exiting\n");
 873                         disable_acpi();
 874                         result = -ENODEV;
 875                 }
 876         } else
 877                 disable_acpi();
 878         /*
 879          * If the laptop falls into the DMI check table, the power state check
 880          * will be disabled in the course of device power transistion.
 881          */
 882         dmi_check_system(power_nocheck_dmi_table);
 883         return result;
 884 }
 885
 886 subsys_initcall(acpi_init);