linux/drivers/acpi/bus.c
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   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#ifdef CONFIG_X86
  37#include <asm/mpspec.h>
  38#endif
  39#include <linux/pci.h>
  40#include <acpi/acpi_bus.h>
  41#include <acpi/acpi_drivers.h>
  42#include <acpi/apei.h>
  43#include <linux/dmi.h>
  44#include <linux/suspend.h>
  45
  46#include "internal.h"
  47
  48#define _COMPONENT              ACPI_BUS_COMPONENT
  49ACPI_MODULE_NAME("bus");
  50
  51struct acpi_device *acpi_root;
  52struct proc_dir_entry *acpi_root_dir;
  53EXPORT_SYMBOL(acpi_root_dir);
  54
  55#define STRUCT_TO_INT(s)        (*((int*)&s))
  56
  57
  58#ifdef CONFIG_X86
  59static int set_copy_dsdt(const struct dmi_system_id *id)
  60{
  61        printk(KERN_NOTICE "%s detected - "
  62                "force copy of DSDT to local memory\n", id->ident);
  63        acpi_gbl_copy_dsdt_locally = 1;
  64        return 0;
  65}
  66
  67static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  68        /*
  69         * Invoke DSDT corruption work-around on all Toshiba Satellite.
  70         * https://bugzilla.kernel.org/show_bug.cgi?id=14679
  71         */
  72        {
  73         .callback = set_copy_dsdt,
  74         .ident = "TOSHIBA Satellite",
  75         .matches = {
  76                DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  77                DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
  78                },
  79        },
  80        {}
  81};
  82#else
  83static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  84        {}
  85};
  86#endif
  87
  88/* --------------------------------------------------------------------------
  89                                Device Management
  90   -------------------------------------------------------------------------- */
  91
  92acpi_status acpi_bus_get_status_handle(acpi_handle handle,
  93                                       unsigned long long *sta)
  94{
  95        acpi_status status;
  96
  97        status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
  98        if (ACPI_SUCCESS(status))
  99                return AE_OK;
 100
 101        if (status == AE_NOT_FOUND) {
 102                *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 103                       ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 104                return AE_OK;
 105        }
 106        return status;
 107}
 108
 109int acpi_bus_get_status(struct acpi_device *device)
 110{
 111        acpi_status status;
 112        unsigned long long sta;
 113
 114        status = acpi_bus_get_status_handle(device->handle, &sta);
 115        if (ACPI_FAILURE(status))
 116                return -ENODEV;
 117
 118        STRUCT_TO_INT(device->status) = (int) sta;
 119
 120        if (device->status.functional && !device->status.present) {
 121                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 122                       "functional but not present;\n",
 123                        device->pnp.bus_id,
 124                        (u32) STRUCT_TO_INT(device->status)));
 125        }
 126
 127        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 128                          device->pnp.bus_id,
 129                          (u32) STRUCT_TO_INT(device->status)));
 130        return 0;
 131}
 132EXPORT_SYMBOL(acpi_bus_get_status);
 133
 134void acpi_bus_private_data_handler(acpi_handle handle,
 135                                   void *context)
 136{
 137        return;
 138}
 139EXPORT_SYMBOL(acpi_bus_private_data_handler);
 140
 141int acpi_bus_get_private_data(acpi_handle handle, void **data)
 142{
 143        acpi_status status;
 144
 145        if (!*data)
 146                return -EINVAL;
 147
 148        status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 149        if (ACPI_FAILURE(status) || !*data) {
 150                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 151                                handle));
 152                return -ENODEV;
 153        }
 154
 155        return 0;
 156}
 157EXPORT_SYMBOL(acpi_bus_get_private_data);
 158
 159static void acpi_print_osc_error(acpi_handle handle,
 160        struct acpi_osc_context *context, char *error)
 161{
 162        struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 163        int i;
 164
 165        if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 166                printk(KERN_DEBUG "%s\n", error);
 167        else {
 168                printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 169                kfree(buffer.pointer);
 170        }
 171        printk(KERN_DEBUG"_OSC request data:");
 172        for (i = 0; i < context->cap.length; i += sizeof(u32))
 173                printk("%x ", *((u32 *)(context->cap.pointer + i)));
 174        printk("\n");
 175}
 176
 177static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 178{
 179        int i;
 180        static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 181                24, 26, 28, 30, 32, 34};
 182
 183        if (strlen(str) != 36)
 184                return AE_BAD_PARAMETER;
 185        for (i = 0; i < 36; i++) {
 186                if (i == 8 || i == 13 || i == 18 || i == 23) {
 187                        if (str[i] != '-')
 188                                return AE_BAD_PARAMETER;
 189                } else if (!isxdigit(str[i]))
 190                        return AE_BAD_PARAMETER;
 191        }
 192        for (i = 0; i < 16; i++) {
 193                uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 194                uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 195        }
 196        return AE_OK;
 197}
 198
 199acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 200{
 201        acpi_status status;
 202        struct acpi_object_list input;
 203        union acpi_object in_params[4];
 204        union acpi_object *out_obj;
 205        u8 uuid[16];
 206        u32 errors;
 207        struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 208
 209        if (!context)
 210                return AE_ERROR;
 211        if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 212                return AE_ERROR;
 213        context->ret.length = ACPI_ALLOCATE_BUFFER;
 214        context->ret.pointer = NULL;
 215
 216        /* Setting up input parameters */
 217        input.count = 4;
 218        input.pointer = in_params;
 219        in_params[0].type               = ACPI_TYPE_BUFFER;
 220        in_params[0].buffer.length      = 16;
 221        in_params[0].buffer.pointer     = uuid;
 222        in_params[1].type               = ACPI_TYPE_INTEGER;
 223        in_params[1].integer.value      = context->rev;
 224        in_params[2].type               = ACPI_TYPE_INTEGER;
 225        in_params[2].integer.value      = context->cap.length/sizeof(u32);
 226        in_params[3].type               = ACPI_TYPE_BUFFER;
 227        in_params[3].buffer.length      = context->cap.length;
 228        in_params[3].buffer.pointer     = context->cap.pointer;
 229
 230        status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 231        if (ACPI_FAILURE(status))
 232                return status;
 233
 234        if (!output.length)
 235                return AE_NULL_OBJECT;
 236
 237        out_obj = output.pointer;
 238        if (out_obj->type != ACPI_TYPE_BUFFER
 239                || out_obj->buffer.length != context->cap.length) {
 240                acpi_print_osc_error(handle, context,
 241                        "_OSC evaluation returned wrong type");
 242                status = AE_TYPE;
 243                goto out_kfree;
 244        }
 245        /* Need to ignore the bit0 in result code */
 246        errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 247        if (errors) {
 248                if (errors & OSC_REQUEST_ERROR)
 249                        acpi_print_osc_error(handle, context,
 250                                "_OSC request failed");
 251                if (errors & OSC_INVALID_UUID_ERROR)
 252                        acpi_print_osc_error(handle, context,
 253                                "_OSC invalid UUID");
 254                if (errors & OSC_INVALID_REVISION_ERROR)
 255                        acpi_print_osc_error(handle, context,
 256                                "_OSC invalid revision");
 257                if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 258                        if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
 259                            & OSC_QUERY_ENABLE)
 260                                goto out_success;
 261                        status = AE_SUPPORT;
 262                        goto out_kfree;
 263                }
 264                status = AE_ERROR;
 265                goto out_kfree;
 266        }
 267out_success:
 268        context->ret.length = out_obj->buffer.length;
 269        context->ret.pointer = kmemdup(out_obj->buffer.pointer,
 270                                       context->ret.length, GFP_KERNEL);
 271        if (!context->ret.pointer) {
 272                status =  AE_NO_MEMORY;
 273                goto out_kfree;
 274        }
 275        status =  AE_OK;
 276
 277out_kfree:
 278        kfree(output.pointer);
 279        if (status != AE_OK)
 280                context->ret.pointer = NULL;
 281        return status;
 282}
 283EXPORT_SYMBOL(acpi_run_osc);
 284
 285bool osc_sb_apei_support_acked;
 286static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 287static void acpi_bus_osc_support(void)
 288{
 289        u32 capbuf[2];
 290        struct acpi_osc_context context = {
 291                .uuid_str = sb_uuid_str,
 292                .rev = 1,
 293                .cap.length = 8,
 294                .cap.pointer = capbuf,
 295        };
 296        acpi_handle handle;
 297
 298        capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 299        capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 300#if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 301                        defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 302        capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 303#endif
 304
 305#if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 306        capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
 307#endif
 308
 309#ifdef ACPI_HOTPLUG_OST
 310        capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 311#endif
 312
 313        if (!ghes_disable)
 314                capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
 315        if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 316                return;
 317        if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
 318                u32 *capbuf_ret = context.ret.pointer;
 319                if (context.ret.length > OSC_SUPPORT_TYPE)
 320                        osc_sb_apei_support_acked =
 321                                capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
 322                kfree(context.ret.pointer);
 323        }
 324        /* do we need to check other returned cap? Sounds no */
 325}
 326
 327/* --------------------------------------------------------------------------
 328                             Notification Handling
 329   -------------------------------------------------------------------------- */
 330
 331static void acpi_bus_check_device(acpi_handle handle)
 332{
 333        struct acpi_device *device;
 334        acpi_status status;
 335        struct acpi_device_status old_status;
 336
 337        if (acpi_bus_get_device(handle, &device))
 338                return;
 339        if (!device)
 340                return;
 341
 342        old_status = device->status;
 343
 344        /*
 345         * Make sure this device's parent is present before we go about
 346         * messing with the device.
 347         */
 348        if (device->parent && !device->parent->status.present) {
 349                device->status = device->parent->status;
 350                return;
 351        }
 352
 353        status = acpi_bus_get_status(device);
 354        if (ACPI_FAILURE(status))
 355                return;
 356
 357        if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 358                return;
 359
 360        /*
 361         * Device Insertion/Removal
 362         */
 363        if ((device->status.present) && !(old_status.present)) {
 364                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 365                /* TBD: Handle device insertion */
 366        } else if (!(device->status.present) && (old_status.present)) {
 367                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 368                /* TBD: Handle device removal */
 369        }
 370}
 371
 372static void acpi_bus_check_scope(acpi_handle handle)
 373{
 374        /* Status Change? */
 375        acpi_bus_check_device(handle);
 376
 377        /*
 378         * TBD: Enumerate child devices within this device's scope and
 379         *       run acpi_bus_check_device()'s on them.
 380         */
 381}
 382
 383/**
 384 * acpi_bus_notify
 385 * ---------------
 386 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 387 */
 388static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 389{
 390        struct acpi_device *device = NULL;
 391        struct acpi_driver *driver;
 392
 393        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 394                          type, handle));
 395
 396        switch (type) {
 397
 398        case ACPI_NOTIFY_BUS_CHECK:
 399                acpi_bus_check_scope(handle);
 400                /*
 401                 * TBD: We'll need to outsource certain events to non-ACPI
 402                 *      drivers via the device manager (device.c).
 403                 */
 404                break;
 405
 406        case ACPI_NOTIFY_DEVICE_CHECK:
 407                acpi_bus_check_device(handle);
 408                /*
 409                 * TBD: We'll need to outsource certain events to non-ACPI
 410                 *      drivers via the device manager (device.c).
 411                 */
 412                break;
 413
 414        case ACPI_NOTIFY_DEVICE_WAKE:
 415                /* TBD */
 416                break;
 417
 418        case ACPI_NOTIFY_EJECT_REQUEST:
 419                /* TBD */
 420                break;
 421
 422        case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 423                /* TBD: Exactly what does 'light' mean? */
 424                break;
 425
 426        case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 427                /* TBD */
 428                break;
 429
 430        case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 431                /* TBD */
 432                break;
 433
 434        case ACPI_NOTIFY_POWER_FAULT:
 435                /* TBD */
 436                break;
 437
 438        default:
 439                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 440                                  "Received unknown/unsupported notification [%08x]\n",
 441                                  type));
 442                break;
 443        }
 444
 445        acpi_bus_get_device(handle, &device);
 446        if (device) {
 447                driver = device->driver;
 448                if (driver && driver->ops.notify &&
 449                    (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 450                        driver->ops.notify(device, type);
 451        }
 452}
 453
 454/* --------------------------------------------------------------------------
 455                             Initialization/Cleanup
 456   -------------------------------------------------------------------------- */
 457
 458static int __init acpi_bus_init_irq(void)
 459{
 460        acpi_status status;
 461        char *message = NULL;
 462
 463
 464        /*
 465         * Let the system know what interrupt model we are using by
 466         * evaluating the \_PIC object, if exists.
 467         */
 468
 469        switch (acpi_irq_model) {
 470        case ACPI_IRQ_MODEL_PIC:
 471                message = "PIC";
 472                break;
 473        case ACPI_IRQ_MODEL_IOAPIC:
 474                message = "IOAPIC";
 475                break;
 476        case ACPI_IRQ_MODEL_IOSAPIC:
 477                message = "IOSAPIC";
 478                break;
 479        case ACPI_IRQ_MODEL_PLATFORM:
 480                message = "platform specific model";
 481                break;
 482        default:
 483                printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 484                return -ENODEV;
 485        }
 486
 487        printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 488
 489        status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
 490        if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 491                ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 492                return -ENODEV;
 493        }
 494
 495        return 0;
 496}
 497
 498u8 acpi_gbl_permanent_mmap;
 499
 500
 501void __init acpi_early_init(void)
 502{
 503        acpi_status status;
 504
 505        if (acpi_disabled)
 506                return;
 507
 508        printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 509
 510        /* enable workarounds, unless strict ACPI spec. compliance */
 511        if (!acpi_strict)
 512                acpi_gbl_enable_interpreter_slack = TRUE;
 513
 514        acpi_gbl_permanent_mmap = 1;
 515
 516        /*
 517         * If the machine falls into the DMI check table,
 518         * DSDT will be copied to memory
 519         */
 520        dmi_check_system(dsdt_dmi_table);
 521
 522        status = acpi_reallocate_root_table();
 523        if (ACPI_FAILURE(status)) {
 524                printk(KERN_ERR PREFIX
 525                       "Unable to reallocate ACPI tables\n");
 526                goto error0;
 527        }
 528
 529        status = acpi_initialize_subsystem();
 530        if (ACPI_FAILURE(status)) {
 531                printk(KERN_ERR PREFIX
 532                       "Unable to initialize the ACPI Interpreter\n");
 533                goto error0;
 534        }
 535
 536        status = acpi_load_tables();
 537        if (ACPI_FAILURE(status)) {
 538                printk(KERN_ERR PREFIX
 539                       "Unable to load the System Description Tables\n");
 540                goto error0;
 541        }
 542
 543#ifdef CONFIG_X86
 544        if (!acpi_ioapic) {
 545                /* compatible (0) means level (3) */
 546                if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 547                        acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 548                        acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 549                }
 550                /* Set PIC-mode SCI trigger type */
 551                acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 552                                         (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 553        } else {
 554                /*
 555                 * now that acpi_gbl_FADT is initialized,
 556                 * update it with result from INT_SRC_OVR parsing
 557                 */
 558                acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 559        }
 560#endif
 561
 562        status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
 563        if (ACPI_FAILURE(status)) {
 564                printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 565                goto error0;
 566        }
 567
 568        return;
 569
 570      error0:
 571        disable_acpi();
 572        return;
 573}
 574
 575static int __init acpi_bus_init(void)
 576{
 577        int result;
 578        acpi_status status;
 579
 580        acpi_os_initialize1();
 581
 582        status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
 583        if (ACPI_FAILURE(status)) {
 584                printk(KERN_ERR PREFIX
 585                       "Unable to start the ACPI Interpreter\n");
 586                goto error1;
 587        }
 588
 589        /*
 590         * ACPI 2.0 requires the EC driver to be loaded and work before
 591         * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 592         * is called).
 593         *
 594         * This is accomplished by looking for the ECDT table, and getting
 595         * the EC parameters out of that.
 596         */
 597        status = acpi_ec_ecdt_probe();
 598        /* Ignore result. Not having an ECDT is not fatal. */
 599
 600        status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 601        if (ACPI_FAILURE(status)) {
 602                printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 603                goto error1;
 604        }
 605
 606        /*
 607         * _OSC method may exist in module level code,
 608         * so it must be run after ACPI_FULL_INITIALIZATION
 609         */
 610        acpi_bus_osc_support();
 611
 612        /*
 613         * _PDC control method may load dynamic SSDT tables,
 614         * and we need to install the table handler before that.
 615         */
 616        acpi_sysfs_init();
 617
 618        acpi_early_processor_set_pdc();
 619
 620        /*
 621         * Maybe EC region is required at bus_scan/acpi_get_devices. So it
 622         * is necessary to enable it as early as possible.
 623         */
 624        acpi_boot_ec_enable();
 625
 626        printk(KERN_INFO PREFIX "Interpreter enabled\n");
 627
 628        /* Initialize sleep structures */
 629        acpi_sleep_init();
 630
 631        /*
 632         * Get the system interrupt model and evaluate \_PIC.
 633         */
 634        result = acpi_bus_init_irq();
 635        if (result)
 636                goto error1;
 637
 638        /*
 639         * Register the for all standard device notifications.
 640         */
 641        status =
 642            acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 643                                        &acpi_bus_notify, NULL);
 644        if (ACPI_FAILURE(status)) {
 645                printk(KERN_ERR PREFIX
 646                       "Unable to register for device notifications\n");
 647                goto error1;
 648        }
 649
 650        /*
 651         * Create the top ACPI proc directory
 652         */
 653        acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 654
 655        return 0;
 656
 657        /* Mimic structured exception handling */
 658      error1:
 659        acpi_terminate();
 660        return -ENODEV;
 661}
 662
 663struct kobject *acpi_kobj;
 664EXPORT_SYMBOL_GPL(acpi_kobj);
 665
 666static int __init acpi_init(void)
 667{
 668        int result;
 669
 670        if (acpi_disabled) {
 671                printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 672                return -ENODEV;
 673        }
 674
 675        acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
 676        if (!acpi_kobj) {
 677                printk(KERN_WARNING "%s: kset create error\n", __func__);
 678                acpi_kobj = NULL;
 679        }
 680
 681        init_acpi_device_notify();
 682        result = acpi_bus_init();
 683        if (result) {
 684                disable_acpi();
 685                return result;
 686        }
 687
 688        pci_mmcfg_late_init();
 689        acpi_scan_init();
 690        acpi_ec_init();
 691        acpi_debugfs_init();
 692        acpi_sleep_proc_init();
 693        acpi_wakeup_device_init();
 694        return 0;
 695}
 696
 697subsys_initcall(acpi_init);
 698
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