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 #include <linux/slab.h>
  36 #include <linux/regulator/machine.h>
  37 #ifdef CONFIG_X86
  38 #include <asm/mpspec.h>
  39 #endif
  40 #include <linux/pci.h>
  41 #include <acpi/apei.h>
  42 #include <linux/dmi.h>
  43 #include <linux/suspend.h>
  44
  45 #include "internal.h"
  46
  47 #define _COMPONENT              ACPI_BUS_COMPONENT
  48 ACPI_MODULE_NAME("bus");
  49
  50 struct acpi_device *acpi_root;
  51 struct proc_dir_entry *acpi_root_dir;
  52 EXPORT_SYMBOL(acpi_root_dir);
  53
  54 #ifdef CONFIG_X86
  55 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  56 static inline int set_copy_dsdt(const struct dmi_system_id *id)
  57 {
  58         return 0;
  59 }
  60 #else
  61 static int set_copy_dsdt(const struct dmi_system_id *id)
  62 {
  63         printk(KERN_NOTICE "%s detected - "
  64                 "force copy of DSDT to local memory\n", id->ident);
  65         acpi_gbl_copy_dsdt_locally = 1;
  66         return 0;
  67 }
  68 #endif
  69
  70 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  71         /*
  72          * Invoke DSDT corruption work-around on all Toshiba Satellite.
  73          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
  74          */
  75         {
  76          .callback = set_copy_dsdt,
  77          .ident = "TOSHIBA Satellite",
  78          .matches = {
  79                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  80                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
  81                 },
  82         },
  83         {}
  84 };
  85 #else
  86 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  87         {}
  88 };
  89 #endif
  90
  91 /* --------------------------------------------------------------------------
  92                                 Device Management
  93    -------------------------------------------------------------------------- */
  94
  95 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
  96                                        unsigned long long *sta)
  97 {
  98         acpi_status status;
  99
 100         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
 101         if (ACPI_SUCCESS(status))
 102                 return AE_OK;
 103
 104         if (status == AE_NOT_FOUND) {
 105                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 106                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 107                 return AE_OK;
 108         }
 109         return status;
 110 }
 111
 112 int acpi_bus_get_status(struct acpi_device *device)
 113 {
 114         acpi_status status;
 115         unsigned long long sta;
 116
 117         status = acpi_bus_get_status_handle(device->handle, &sta);
 118         if (ACPI_FAILURE(status))
 119                 return -ENODEV;
 120
 121         acpi_set_device_status(device, sta);
 122
 123         if (device->status.functional && !device->status.present) {
 124                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 125                        "functional but not present;\n",
 126                         device->pnp.bus_id, (u32)sta));
 127         }
 128
 129         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 130                           device->pnp.bus_id, (u32)sta));
 131         return 0;
 132 }
 133 EXPORT_SYMBOL(acpi_bus_get_status);
 134
 135 void acpi_bus_private_data_handler(acpi_handle handle,
 136                                    void *context)
 137 {
 138         return;
 139 }
 140 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 141
 142 int acpi_bus_attach_private_data(acpi_handle handle, void *data)
 143 {
 144         acpi_status status;
 145
 146         status = acpi_attach_data(handle,
 147                         acpi_bus_private_data_handler, data);
 148         if (ACPI_FAILURE(status)) {
 149                 acpi_handle_debug(handle, "Error attaching device data\n");
 150                 return -ENODEV;
 151         }
 152
 153         return 0;
 154 }
 155 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
 156
 157 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 158 {
 159         acpi_status status;
 160
 161         if (!*data)
 162                 return -EINVAL;
 163
 164         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 165         if (ACPI_FAILURE(status)) {
 166                 acpi_handle_debug(handle, "No context for object\n");
 167                 return -ENODEV;
 168         }
 169
 170         return 0;
 171 }
 172 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
 173
 174 void acpi_bus_detach_private_data(acpi_handle handle)
 175 {
 176         acpi_detach_data(handle, acpi_bus_private_data_handler);
 177 }
 178 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
 179
 180 static void acpi_print_osc_error(acpi_handle handle,
 181         struct acpi_osc_context *context, char *error)
 182 {
 183         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 184         int i;
 185
 186         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 187                 printk(KERN_DEBUG "%s\n", error);
 188         else {
 189                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 190                 kfree(buffer.pointer);
 191         }
 192         printk(KERN_DEBUG"_OSC request data:");
 193         for (i = 0; i < context->cap.length; i += sizeof(u32))
 194                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
 195         printk("\n");
 196 }
 197
 198 acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 199 {
 200         int i;
 201         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 202                 24, 26, 28, 30, 32, 34};
 203
 204         if (strlen(str) != 36)
 205                 return AE_BAD_PARAMETER;
 206         for (i = 0; i < 36; i++) {
 207                 if (i == 8 || i == 13 || i == 18 || i == 23) {
 208                         if (str[i] != '-')
 209                                 return AE_BAD_PARAMETER;
 210                 } else if (!isxdigit(str[i]))
 211                         return AE_BAD_PARAMETER;
 212         }
 213         for (i = 0; i < 16; i++) {
 214                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 215                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 216         }
 217         return AE_OK;
 218 }
 219 EXPORT_SYMBOL_GPL(acpi_str_to_uuid);
 220
 221 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 222 {
 223         acpi_status status;
 224         struct acpi_object_list input;
 225         union acpi_object in_params[4];
 226         union acpi_object *out_obj;
 227         u8 uuid[16];
 228         u32 errors;
 229         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 230
 231         if (!context)
 232                 return AE_ERROR;
 233         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 234                 return AE_ERROR;
 235         context->ret.length = ACPI_ALLOCATE_BUFFER;
 236         context->ret.pointer = NULL;
 237
 238         /* Setting up input parameters */
 239         input.count = 4;
 240         input.pointer = in_params;
 241         in_params[0].type               = ACPI_TYPE_BUFFER;
 242         in_params[0].buffer.length      = 16;
 243         in_params[0].buffer.pointer     = uuid;
 244         in_params[1].type               = ACPI_TYPE_INTEGER;
 245         in_params[1].integer.value      = context->rev;
 246         in_params[2].type               = ACPI_TYPE_INTEGER;
 247         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 248         in_params[3].type               = ACPI_TYPE_BUFFER;
 249         in_params[3].buffer.length      = context->cap.length;
 250         in_params[3].buffer.pointer     = context->cap.pointer;
 251
 252         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 253         if (ACPI_FAILURE(status))
 254                 return status;
 255
 256         if (!output.length)
 257                 return AE_NULL_OBJECT;
 258
 259         out_obj = output.pointer;
 260         if (out_obj->type != ACPI_TYPE_BUFFER
 261                 || out_obj->buffer.length != context->cap.length) {
 262                 acpi_print_osc_error(handle, context,
 263                         "_OSC evaluation returned wrong type");
 264                 status = AE_TYPE;
 265                 goto out_kfree;
 266         }
 267         /* Need to ignore the bit0 in result code */
 268         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 269         if (errors) {
 270                 if (errors & OSC_REQUEST_ERROR)
 271                         acpi_print_osc_error(handle, context,
 272                                 "_OSC request failed");
 273                 if (errors & OSC_INVALID_UUID_ERROR)
 274                         acpi_print_osc_error(handle, context,
 275                                 "_OSC invalid UUID");
 276                 if (errors & OSC_INVALID_REVISION_ERROR)
 277                         acpi_print_osc_error(handle, context,
 278                                 "_OSC invalid revision");
 279                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 280                         if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
 281                             & OSC_QUERY_ENABLE)
 282                                 goto out_success;
 283                         status = AE_SUPPORT;
 284                         goto out_kfree;
 285                 }
 286                 status = AE_ERROR;
 287                 goto out_kfree;
 288         }
 289 out_success:
 290         context->ret.length = out_obj->buffer.length;
 291         context->ret.pointer = kmemdup(out_obj->buffer.pointer,
 292                                        context->ret.length, GFP_KERNEL);
 293         if (!context->ret.pointer) {
 294                 status =  AE_NO_MEMORY;
 295                 goto out_kfree;
 296         }
 297         status =  AE_OK;
 298
 299 out_kfree:
 300         kfree(output.pointer);
 301         if (status != AE_OK)
 302                 context->ret.pointer = NULL;
 303         return status;
 304 }
 305 EXPORT_SYMBOL(acpi_run_osc);
 306
 307 bool osc_sb_apei_support_acked;
 308 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 309 static void acpi_bus_osc_support(void)
 310 {
 311         u32 capbuf[2];
 312         struct acpi_osc_context context = {
 313                 .uuid_str = sb_uuid_str,
 314                 .rev = 1,
 315                 .cap.length = 8,
 316                 .cap.pointer = capbuf,
 317         };
 318         acpi_handle handle;
 319
 320         capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
 321         capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 322 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 323                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 324         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
 325 #endif
 326
 327 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 328         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
 329 #endif
 330
 331         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 332
 333         if (!ghes_disable)
 334                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
 335         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 336                 return;
 337         if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
 338                 u32 *capbuf_ret = context.ret.pointer;
 339                 if (context.ret.length > OSC_SUPPORT_DWORD)
 340                         osc_sb_apei_support_acked =
 341                                 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
 342                 kfree(context.ret.pointer);
 343         }
 344         /* do we need to check other returned cap? Sounds no */
 345 }
 346
 347 /* --------------------------------------------------------------------------
 348                              Notification Handling
 349    -------------------------------------------------------------------------- */
 350
 351 /**
 352  * acpi_bus_notify
 353  * ---------------
 354  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 355  */
 356 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 357 {
 358         struct acpi_device *adev;
 359         struct acpi_driver *driver;
 360         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 361         bool hotplug_event = false;
 362
 363         switch (type) {
 364         case ACPI_NOTIFY_BUS_CHECK:
 365                 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
 366                 hotplug_event = true;
 367                 break;
 368
 369         case ACPI_NOTIFY_DEVICE_CHECK:
 370                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
 371                 hotplug_event = true;
 372                 break;
 373
 374         case ACPI_NOTIFY_DEVICE_WAKE:
 375                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
 376                 break;
 377
 378         case ACPI_NOTIFY_EJECT_REQUEST:
 379                 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
 380                 hotplug_event = true;
 381                 break;
 382
 383         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 384                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
 385                 /* TBD: Exactly what does 'light' mean? */
 386                 break;
 387
 388         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 389                 acpi_handle_err(handle, "Device cannot be configured due "
 390                                 "to a frequency mismatch\n");
 391                 break;
 392
 393         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 394                 acpi_handle_err(handle, "Device cannot be configured due "
 395                                 "to a bus mode mismatch\n");
 396                 break;
 397
 398         case ACPI_NOTIFY_POWER_FAULT:
 399                 acpi_handle_err(handle, "Device has suffered a power fault\n");
 400                 break;
 401
 402         default:
 403                 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
 404                 break;
 405         }
 406
 407         adev = acpi_bus_get_acpi_device(handle);
 408         if (!adev)
 409                 goto err;
 410
 411         driver = adev->driver;
 412         if (driver && driver->ops.notify &&
 413             (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 414                 driver->ops.notify(adev, type);
 415
 416         if (hotplug_event && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
 417                 return;
 418
 419         acpi_bus_put_acpi_device(adev);
 420         return;
 421
 422  err:
 423         acpi_evaluate_ost(handle, type, ost_code, NULL);
 424 }
 425
 426 /* --------------------------------------------------------------------------
 427                              Initialization/Cleanup
 428    -------------------------------------------------------------------------- */
 429
 430 static int __init acpi_bus_init_irq(void)
 431 {
 432         acpi_status status;
 433         char *message = NULL;
 434
 435
 436         /*
 437          * Let the system know what interrupt model we are using by
 438          * evaluating the \_PIC object, if exists.
 439          */
 440
 441         switch (acpi_irq_model) {
 442         case ACPI_IRQ_MODEL_PIC:
 443                 message = "PIC";
 444                 break;
 445         case ACPI_IRQ_MODEL_IOAPIC:
 446                 message = "IOAPIC";
 447                 break;
 448         case ACPI_IRQ_MODEL_IOSAPIC:
 449                 message = "IOSAPIC";
 450                 break;
 451         case ACPI_IRQ_MODEL_PLATFORM:
 452                 message = "platform specific model";
 453                 break;
 454         default:
 455                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 456                 return -ENODEV;
 457         }
 458
 459         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 460
 461         status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
 462         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 463                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 464                 return -ENODEV;
 465         }
 466
 467         return 0;
 468 }
 469
 470 void __init acpi_early_init(void)
 471 {
 472         acpi_status status;
 473
 474         if (acpi_disabled)
 475                 return;
 476
 477         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 478
 479         /* It's safe to verify table checksums during late stage */
 480         acpi_gbl_verify_table_checksum = TRUE;
 481
 482         /* enable workarounds, unless strict ACPI spec. compliance */
 483         if (!acpi_strict)
 484                 acpi_gbl_enable_interpreter_slack = TRUE;
 485
 486         acpi_gbl_permanent_mmap = 1;
 487
 488         /*
 489          * If the machine falls into the DMI check table,
 490          * DSDT will be copied to memory
 491          */
 492         dmi_check_system(dsdt_dmi_table);
 493
 494         status = acpi_reallocate_root_table();
 495         if (ACPI_FAILURE(status)) {
 496                 printk(KERN_ERR PREFIX
 497                        "Unable to reallocate ACPI tables\n");
 498                 goto error0;
 499         }
 500
 501         status = acpi_initialize_subsystem();
 502         if (ACPI_FAILURE(status)) {
 503                 printk(KERN_ERR PREFIX
 504                        "Unable to initialize the ACPI Interpreter\n");
 505                 goto error0;
 506         }
 507
 508         status = acpi_load_tables();
 509         if (ACPI_FAILURE(status)) {
 510                 printk(KERN_ERR PREFIX
 511                        "Unable to load the System Description Tables\n");
 512                 goto error0;
 513         }
 514
 515 #ifdef CONFIG_X86
 516         if (!acpi_ioapic) {
 517                 /* compatible (0) means level (3) */
 518                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 519                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 520                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 521                 }
 522                 /* Set PIC-mode SCI trigger type */
 523                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 524                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 525         } else {
 526                 /*
 527                  * now that acpi_gbl_FADT is initialized,
 528                  * update it with result from INT_SRC_OVR parsing
 529                  */
 530                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 531         }
 532 #endif
 533
 534         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
 535         if (ACPI_FAILURE(status)) {
 536                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 537                 goto error0;
 538         }
 539
 540         /*
 541          * If the system is using ACPI then we can be reasonably
 542          * confident that any regulators are managed by the firmware
 543          * so tell the regulator core it has everything it needs to
 544          * know.
 545          */
 546         regulator_has_full_constraints();
 547
 548         return;
 549
 550       error0:
 551         disable_acpi();
 552         return;
 553 }
 554
 555 static int __init acpi_bus_init(void)
 556 {
 557         int result;
 558         acpi_status status;
 559
 560         acpi_os_initialize1();
 561
 562         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
 563         if (ACPI_FAILURE(status)) {
 564                 printk(KERN_ERR PREFIX
 565                        "Unable to start the ACPI Interpreter\n");
 566                 goto error1;
 567         }
 568
 569         /*
 570          * ACPI 2.0 requires the EC driver to be loaded and work before
 571          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 572          * is called).
 573          *
 574          * This is accomplished by looking for the ECDT table, and getting
 575          * the EC parameters out of that.
 576          */
 577         status = acpi_ec_ecdt_probe();
 578         /* Ignore result. Not having an ECDT is not fatal. */
 579
 580         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 581         if (ACPI_FAILURE(status)) {
 582                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 583                 goto error1;
 584         }
 585
 586         /*
 587          * _OSC method may exist in module level code,
 588          * so it must be run after ACPI_FULL_INITIALIZATION
 589          */
 590         acpi_bus_osc_support();
 591
 592         /*
 593          * _PDC control method may load dynamic SSDT tables,
 594          * and we need to install the table handler before that.
 595          */
 596         acpi_sysfs_init();
 597
 598         acpi_early_processor_set_pdc();
 599
 600         /*
 601          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
 602          * is necessary to enable it as early as possible.
 603          */
 604         acpi_boot_ec_enable();
 605
 606         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 607
 608         /* Initialize sleep structures */
 609         acpi_sleep_init();
 610
 611         /*
 612          * Get the system interrupt model and evaluate \_PIC.
 613          */
 614         result = acpi_bus_init_irq();
 615         if (result)
 616                 goto error1;
 617
 618         /*
 619          * Register the for all standard device notifications.
 620          */
 621         status =
 622             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 623                                         &acpi_bus_notify, NULL);
 624         if (ACPI_FAILURE(status)) {
 625                 printk(KERN_ERR PREFIX
 626                        "Unable to register for device notifications\n");
 627                 goto error1;
 628         }
 629
 630         /*
 631          * Create the top ACPI proc directory
 632          */
 633         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 634
 635         return 0;
 636
 637         /* Mimic structured exception handling */
 638       error1:
 639         acpi_terminate();
 640         return -ENODEV;
 641 }
 642
 643 struct kobject *acpi_kobj;
 644 EXPORT_SYMBOL_GPL(acpi_kobj);
 645
 646 static int __init acpi_init(void)
 647 {
 648         int result;
 649
 650         if (acpi_disabled) {
 651                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 652                 return -ENODEV;
 653         }
 654
 655         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
 656         if (!acpi_kobj) {
 657                 printk(KERN_WARNING "%s: kset create error\n", __func__);
 658                 acpi_kobj = NULL;
 659         }
 660
 661         init_acpi_device_notify();
 662         result = acpi_bus_init();
 663         if (result) {
 664                 disable_acpi();
 665                 return result;
 666         }
 667
 668         pci_mmcfg_late_init();
 669         acpi_scan_init();
 670         acpi_ec_init();
 671         acpi_debugfs_init();
 672         acpi_sleep_proc_init();
 673         acpi_wakeup_device_init();
 674         return 0;
 675 }
 676
 677 subsys_initcall(acpi_init);