linux/drivers/acpi/bus.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
   4 *
   5 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6 */
   7
   8#define pr_fmt(fmt) "ACPI: " fmt
   9
  10#include <linux/module.h>
  11#include <linux/init.h>
  12#include <linux/ioport.h>
  13#include <linux/kernel.h>
  14#include <linux/list.h>
  15#include <linux/sched.h>
  16#include <linux/pm.h>
  17#include <linux/device.h>
  18#include <linux/proc_fs.h>
  19#include <linux/acpi.h>
  20#include <linux/slab.h>
  21#include <linux/regulator/machine.h>
  22#include <linux/workqueue.h>
  23#include <linux/reboot.h>
  24#include <linux/delay.h>
  25#ifdef CONFIG_X86
  26#include <asm/mpspec.h>
  27#include <linux/dmi.h>
  28#endif
  29#include <linux/acpi_iort.h>
  30#include <linux/pci.h>
  31#include <acpi/apei.h>
  32#include <linux/suspend.h>
  33
  34#include "internal.h"
  35
  36struct acpi_device *acpi_root;
  37struct proc_dir_entry *acpi_root_dir;
  38EXPORT_SYMBOL(acpi_root_dir);
  39
  40#ifdef CONFIG_X86
  41#ifdef CONFIG_ACPI_CUSTOM_DSDT
  42static inline int set_copy_dsdt(const struct dmi_system_id *id)
  43{
  44        return 0;
  45}
  46#else
  47static int set_copy_dsdt(const struct dmi_system_id *id)
  48{
  49        pr_notice("%s detected - force copy of DSDT to local memory\n", id->ident);
  50        acpi_gbl_copy_dsdt_locally = 1;
  51        return 0;
  52}
  53#endif
  54
  55static const struct dmi_system_id dsdt_dmi_table[] __initconst = {
  56        /*
  57         * Invoke DSDT corruption work-around on all Toshiba Satellite.
  58         * https://bugzilla.kernel.org/show_bug.cgi?id=14679
  59         */
  60        {
  61         .callback = set_copy_dsdt,
  62         .ident = "TOSHIBA Satellite",
  63         .matches = {
  64                DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  65                DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
  66                },
  67        },
  68        {}
  69};
  70#endif
  71
  72/* --------------------------------------------------------------------------
  73                                Device Management
  74   -------------------------------------------------------------------------- */
  75
  76acpi_status acpi_bus_get_status_handle(acpi_handle handle,
  77                                       unsigned long long *sta)
  78{
  79        acpi_status status;
  80
  81        status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
  82        if (ACPI_SUCCESS(status))
  83                return AE_OK;
  84
  85        if (status == AE_NOT_FOUND) {
  86                *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
  87                       ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
  88                return AE_OK;
  89        }
  90        return status;
  91}
  92EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);
  93
  94int acpi_bus_get_status(struct acpi_device *device)
  95{
  96        acpi_status status;
  97        unsigned long long sta;
  98
  99        if (acpi_device_always_present(device)) {
 100                acpi_set_device_status(device, ACPI_STA_DEFAULT);
 101                return 0;
 102        }
 103
 104        /* Battery devices must have their deps met before calling _STA */
 105        if (acpi_device_is_battery(device) && device->dep_unmet) {
 106                acpi_set_device_status(device, 0);
 107                return 0;
 108        }
 109
 110        status = acpi_bus_get_status_handle(device->handle, &sta);
 111        if (ACPI_FAILURE(status))
 112                return -ENODEV;
 113
 114        acpi_set_device_status(device, sta);
 115
 116        if (device->status.functional && !device->status.present) {
 117                pr_debug("Device [%s] status [%08x]: functional but not present\n",
 118                         device->pnp.bus_id, (u32)sta);
 119        }
 120
 121        pr_debug("Device [%s] status [%08x]\n", device->pnp.bus_id, (u32)sta);
 122        return 0;
 123}
 124EXPORT_SYMBOL(acpi_bus_get_status);
 125
 126void acpi_bus_private_data_handler(acpi_handle handle,
 127                                   void *context)
 128{
 129        return;
 130}
 131EXPORT_SYMBOL(acpi_bus_private_data_handler);
 132
 133int acpi_bus_attach_private_data(acpi_handle handle, void *data)
 134{
 135        acpi_status status;
 136
 137        status = acpi_attach_data(handle,
 138                        acpi_bus_private_data_handler, data);
 139        if (ACPI_FAILURE(status)) {
 140                acpi_handle_debug(handle, "Error attaching device data\n");
 141                return -ENODEV;
 142        }
 143
 144        return 0;
 145}
 146EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
 147
 148int acpi_bus_get_private_data(acpi_handle handle, void **data)
 149{
 150        acpi_status status;
 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)) {
 157                acpi_handle_debug(handle, "No context for object\n");
 158                return -ENODEV;
 159        }
 160
 161        return 0;
 162}
 163EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
 164
 165void acpi_bus_detach_private_data(acpi_handle handle)
 166{
 167        acpi_detach_data(handle, acpi_bus_private_data_handler);
 168}
 169EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
 170
 171static void acpi_print_osc_error(acpi_handle handle,
 172                                 struct acpi_osc_context *context, char *error)
 173{
 174        int i;
 175
 176        acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);
 177
 178        pr_debug("_OSC request data:");
 179        for (i = 0; i < context->cap.length; i += sizeof(u32))
 180                pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));
 181
 182        pr_debug("\n");
 183}
 184
 185acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 186{
 187        acpi_status status;
 188        struct acpi_object_list input;
 189        union acpi_object in_params[4];
 190        union acpi_object *out_obj;
 191        guid_t guid;
 192        u32 errors;
 193        struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 194
 195        if (!context)
 196                return AE_ERROR;
 197        if (guid_parse(context->uuid_str, &guid))
 198                return AE_ERROR;
 199        context->ret.length = ACPI_ALLOCATE_BUFFER;
 200        context->ret.pointer = NULL;
 201
 202        /* Setting up input parameters */
 203        input.count = 4;
 204        input.pointer = in_params;
 205        in_params[0].type               = ACPI_TYPE_BUFFER;
 206        in_params[0].buffer.length      = 16;
 207        in_params[0].buffer.pointer     = (u8 *)&guid;
 208        in_params[1].type               = ACPI_TYPE_INTEGER;
 209        in_params[1].integer.value      = context->rev;
 210        in_params[2].type               = ACPI_TYPE_INTEGER;
 211        in_params[2].integer.value      = context->cap.length/sizeof(u32);
 212        in_params[3].type               = ACPI_TYPE_BUFFER;
 213        in_params[3].buffer.length      = context->cap.length;
 214        in_params[3].buffer.pointer     = context->cap.pointer;
 215
 216        status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 217        if (ACPI_FAILURE(status))
 218                return status;
 219
 220        if (!output.length)
 221                return AE_NULL_OBJECT;
 222
 223        out_obj = output.pointer;
 224        if (out_obj->type != ACPI_TYPE_BUFFER
 225                || out_obj->buffer.length != context->cap.length) {
 226                acpi_print_osc_error(handle, context,
 227                        "_OSC evaluation returned wrong type");
 228                status = AE_TYPE;
 229                goto out_kfree;
 230        }
 231        /* Need to ignore the bit0 in result code */
 232        errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 233        if (errors) {
 234                if (errors & OSC_REQUEST_ERROR)
 235                        acpi_print_osc_error(handle, context,
 236                                "_OSC request failed");
 237                if (errors & OSC_INVALID_UUID_ERROR)
 238                        acpi_print_osc_error(handle, context,
 239                                "_OSC invalid UUID");
 240                if (errors & OSC_INVALID_REVISION_ERROR)
 241                        acpi_print_osc_error(handle, context,
 242                                "_OSC invalid revision");
 243                if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 244                        if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
 245                            & OSC_QUERY_ENABLE)
 246                                goto out_success;
 247                        status = AE_SUPPORT;
 248                        goto out_kfree;
 249                }
 250                status = AE_ERROR;
 251                goto out_kfree;
 252        }
 253out_success:
 254        context->ret.length = out_obj->buffer.length;
 255        context->ret.pointer = kmemdup(out_obj->buffer.pointer,
 256                                       context->ret.length, GFP_KERNEL);
 257        if (!context->ret.pointer) {
 258                status =  AE_NO_MEMORY;
 259                goto out_kfree;
 260        }
 261        status =  AE_OK;
 262
 263out_kfree:
 264        kfree(output.pointer);
 265        if (status != AE_OK)
 266                context->ret.pointer = NULL;
 267        return status;
 268}
 269EXPORT_SYMBOL(acpi_run_osc);
 270
 271bool osc_sb_apei_support_acked;
 272
 273/*
 274 * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
 275 * OSPM supports platform coordinated low power idle(LPI) states
 276 */
 277bool osc_pc_lpi_support_confirmed;
 278EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
 279
 280/*
 281 * ACPI 6.4 Operating System Capabilities for USB.
 282 */
 283bool osc_sb_native_usb4_support_confirmed;
 284EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed);
 285
 286static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 287static void acpi_bus_osc_negotiate_platform_control(void)
 288{
 289        u32 capbuf[2], *capbuf_ret;
 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_DWORD] = OSC_QUERY_ENABLE;
 299        capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 300        if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
 301                capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
 302        if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
 303                capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
 304
 305        capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 306        capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
 307
 308#ifdef CONFIG_ARM64
 309        capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
 310#endif
 311#ifdef CONFIG_X86
 312        capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
 313        if (boot_cpu_has(X86_FEATURE_HWP)) {
 314                capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
 315                capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
 316        }
 317#endif
 318
 319        if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
 320                capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
 321
 322        if (IS_ENABLED(CONFIG_USB4))
 323                capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_NATIVE_USB4_SUPPORT;
 324
 325        if (!ghes_disable)
 326                capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
 327        if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 328                return;
 329
 330        if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
 331                return;
 332
 333        kfree(context.ret.pointer);
 334
 335        /* Now run _OSC again with query flag clear */
 336        capbuf[OSC_QUERY_DWORD] = 0;
 337
 338        if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
 339                return;
 340
 341        capbuf_ret = context.ret.pointer;
 342        osc_sb_apei_support_acked =
 343                capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
 344        osc_pc_lpi_support_confirmed =
 345                capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
 346        osc_sb_native_usb4_support_confirmed =
 347                capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT;
 348
 349        kfree(context.ret.pointer);
 350}
 351
 352/*
 353 * Native control of USB4 capabilities. If any of the tunneling bits is
 354 * set it means OS is in control and we use software based connection
 355 * manager.
 356 */
 357u32 osc_sb_native_usb4_control;
 358EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control);
 359
 360static void acpi_bus_decode_usb_osc(const char *msg, u32 bits)
 361{
 362        printk(KERN_INFO PREFIX "%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg,
 363               (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-',
 364               (bits & OSC_USB_DP_TUNNELING) ? '+' : '-',
 365               (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-',
 366               (bits & OSC_USB_XDOMAIN) ? '+' : '-');
 367}
 368
 369static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A";
 370static void acpi_bus_osc_negotiate_usb_control(void)
 371{
 372        u32 capbuf[3];
 373        struct acpi_osc_context context = {
 374                .uuid_str = sb_usb_uuid_str,
 375                .rev = 1,
 376                .cap.length = sizeof(capbuf),
 377                .cap.pointer = capbuf,
 378        };
 379        acpi_handle handle;
 380        acpi_status status;
 381        u32 control;
 382
 383        if (!osc_sb_native_usb4_support_confirmed)
 384                return;
 385
 386        if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 387                return;
 388
 389        control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING |
 390                  OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN;
 391
 392        capbuf[OSC_QUERY_DWORD] = 0;
 393        capbuf[OSC_SUPPORT_DWORD] = 0;
 394        capbuf[OSC_CONTROL_DWORD] = control;
 395
 396        status = acpi_run_osc(handle, &context);
 397        if (ACPI_FAILURE(status))
 398                return;
 399
 400        if (context.ret.length != sizeof(capbuf)) {
 401                printk(KERN_INFO PREFIX "USB4 _OSC: returned invalid length buffer\n");
 402                goto out_free;
 403        }
 404
 405        osc_sb_native_usb4_control =
 406                control & ((u32 *)context.ret.pointer)[OSC_CONTROL_DWORD];
 407
 408        acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control);
 409        acpi_bus_decode_usb_osc("USB4 _OSC: OS controls",
 410                                osc_sb_native_usb4_control);
 411
 412out_free:
 413        kfree(context.ret.pointer);
 414}
 415
 416/* --------------------------------------------------------------------------
 417                             Notification Handling
 418   -------------------------------------------------------------------------- */
 419
 420/**
 421 * acpi_bus_notify
 422 * ---------------
 423 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 424 */
 425static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 426{
 427        struct acpi_device *adev;
 428        struct acpi_driver *driver;
 429        u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 430        bool hotplug_event = false;
 431
 432        switch (type) {
 433        case ACPI_NOTIFY_BUS_CHECK:
 434                acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
 435                hotplug_event = true;
 436                break;
 437
 438        case ACPI_NOTIFY_DEVICE_CHECK:
 439                acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
 440                hotplug_event = true;
 441                break;
 442
 443        case ACPI_NOTIFY_DEVICE_WAKE:
 444                acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
 445                break;
 446
 447        case ACPI_NOTIFY_EJECT_REQUEST:
 448                acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
 449                hotplug_event = true;
 450                break;
 451
 452        case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 453                acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
 454                /* TBD: Exactly what does 'light' mean? */
 455                break;
 456
 457        case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 458                acpi_handle_err(handle, "Device cannot be configured due "
 459                                "to a frequency mismatch\n");
 460                break;
 461
 462        case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 463                acpi_handle_err(handle, "Device cannot be configured due "
 464                                "to a bus mode mismatch\n");
 465                break;
 466
 467        case ACPI_NOTIFY_POWER_FAULT:
 468                acpi_handle_err(handle, "Device has suffered a power fault\n");
 469                break;
 470
 471        default:
 472                acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
 473                break;
 474        }
 475
 476        adev = acpi_bus_get_acpi_device(handle);
 477        if (!adev)
 478                goto err;
 479
 480        driver = adev->driver;
 481        if (driver && driver->ops.notify &&
 482            (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 483                driver->ops.notify(adev, type);
 484
 485        if (!hotplug_event) {
 486                acpi_bus_put_acpi_device(adev);
 487                return;
 488        }
 489
 490        if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
 491                return;
 492
 493        acpi_bus_put_acpi_device(adev);
 494
 495 err:
 496        acpi_evaluate_ost(handle, type, ost_code, NULL);
 497}
 498
 499static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 500{
 501        struct acpi_device *device = data;
 502
 503        device->driver->ops.notify(device, event);
 504}
 505
 506static void acpi_device_notify_fixed(void *data)
 507{
 508        struct acpi_device *device = data;
 509
 510        /* Fixed hardware devices have no handles */
 511        acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 512}
 513
 514static u32 acpi_device_fixed_event(void *data)
 515{
 516        acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
 517        return ACPI_INTERRUPT_HANDLED;
 518}
 519
 520static int acpi_device_install_notify_handler(struct acpi_device *device)
 521{
 522        acpi_status status;
 523
 524        if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 525                status =
 526                    acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 527                                                     acpi_device_fixed_event,
 528                                                     device);
 529        else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 530                status =
 531                    acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 532                                                     acpi_device_fixed_event,
 533                                                     device);
 534        else
 535                status = acpi_install_notify_handler(device->handle,
 536                                                     ACPI_DEVICE_NOTIFY,
 537                                                     acpi_device_notify,
 538                                                     device);
 539
 540        if (ACPI_FAILURE(status))
 541                return -EINVAL;
 542        return 0;
 543}
 544
 545static void acpi_device_remove_notify_handler(struct acpi_device *device)
 546{
 547        if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 548                acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 549                                                acpi_device_fixed_event);
 550        else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 551                acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 552                                                acpi_device_fixed_event);
 553        else
 554                acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 555                                           acpi_device_notify);
 556}
 557
 558/* Handle events targeting \_SB device (at present only graceful shutdown) */
 559
 560#define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
 561#define ACPI_SB_INDICATE_INTERVAL       10000
 562
 563static void sb_notify_work(struct work_struct *dummy)
 564{
 565        acpi_handle sb_handle;
 566
 567        orderly_poweroff(true);
 568
 569        /*
 570         * After initiating graceful shutdown, the ACPI spec requires OSPM
 571         * to evaluate _OST method once every 10seconds to indicate that
 572         * the shutdown is in progress
 573         */
 574        acpi_get_handle(NULL, "\\_SB", &sb_handle);
 575        while (1) {
 576                pr_info("Graceful shutdown in progress.\n");
 577                acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
 578                                ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
 579                msleep(ACPI_SB_INDICATE_INTERVAL);
 580        }
 581}
 582
 583static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
 584{
 585        static DECLARE_WORK(acpi_sb_work, sb_notify_work);
 586
 587        if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
 588                if (!work_busy(&acpi_sb_work))
 589                        schedule_work(&acpi_sb_work);
 590        } else
 591                pr_warn("event %x is not supported by \\_SB device\n", event);
 592}
 593
 594static int __init acpi_setup_sb_notify_handler(void)
 595{
 596        acpi_handle sb_handle;
 597
 598        if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
 599                return -ENXIO;
 600
 601        if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
 602                                                acpi_sb_notify, NULL)))
 603                return -EINVAL;
 604
 605        return 0;
 606}
 607
 608/* --------------------------------------------------------------------------
 609                             Device Matching
 610   -------------------------------------------------------------------------- */
 611
 612/**
 613 * acpi_get_first_physical_node - Get first physical node of an ACPI device
 614 * @adev:       ACPI device in question
 615 *
 616 * Return: First physical node of ACPI device @adev
 617 */
 618struct device *acpi_get_first_physical_node(struct acpi_device *adev)
 619{
 620        struct mutex *physical_node_lock = &adev->physical_node_lock;
 621        struct device *phys_dev;
 622
 623        mutex_lock(physical_node_lock);
 624        if (list_empty(&adev->physical_node_list)) {
 625                phys_dev = NULL;
 626        } else {
 627                const struct acpi_device_physical_node *node;
 628
 629                node = list_first_entry(&adev->physical_node_list,
 630                                        struct acpi_device_physical_node, node);
 631
 632                phys_dev = node->dev;
 633        }
 634        mutex_unlock(physical_node_lock);
 635        return phys_dev;
 636}
 637EXPORT_SYMBOL_GPL(acpi_get_first_physical_node);
 638
 639static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
 640                                                      const struct device *dev)
 641{
 642        const struct device *phys_dev = acpi_get_first_physical_node(adev);
 643
 644        return phys_dev && phys_dev == dev ? adev : NULL;
 645}
 646
 647/**
 648 * acpi_device_is_first_physical_node - Is given dev first physical node
 649 * @adev: ACPI companion device
 650 * @dev: Physical device to check
 651 *
 652 * Function checks if given @dev is the first physical devices attached to
 653 * the ACPI companion device. This distinction is needed in some cases
 654 * where the same companion device is shared between many physical devices.
 655 *
 656 * Note that the caller have to provide valid @adev pointer.
 657 */
 658bool acpi_device_is_first_physical_node(struct acpi_device *adev,
 659                                        const struct device *dev)
 660{
 661        return !!acpi_primary_dev_companion(adev, dev);
 662}
 663
 664/*
 665 * acpi_companion_match() - Can we match via ACPI companion device
 666 * @dev: Device in question
 667 *
 668 * Check if the given device has an ACPI companion and if that companion has
 669 * a valid list of PNP IDs, and if the device is the first (primary) physical
 670 * device associated with it.  Return the companion pointer if that's the case
 671 * or NULL otherwise.
 672 *
 673 * If multiple physical devices are attached to a single ACPI companion, we need
 674 * to be careful.  The usage scenario for this kind of relationship is that all
 675 * of the physical devices in question use resources provided by the ACPI
 676 * companion.  A typical case is an MFD device where all the sub-devices share
 677 * the parent's ACPI companion.  In such cases we can only allow the primary
 678 * (first) physical device to be matched with the help of the companion's PNP
 679 * IDs.
 680 *
 681 * Additional physical devices sharing the ACPI companion can still use
 682 * resources available from it but they will be matched normally using functions
 683 * provided by their bus types (and analogously for their modalias).
 684 */
 685struct acpi_device *acpi_companion_match(const struct device *dev)
 686{
 687        struct acpi_device *adev;
 688
 689        adev = ACPI_COMPANION(dev);
 690        if (!adev)
 691                return NULL;
 692
 693        if (list_empty(&adev->pnp.ids))
 694                return NULL;
 695
 696        return acpi_primary_dev_companion(adev, dev);
 697}
 698
 699/**
 700 * acpi_of_match_device - Match device object using the "compatible" property.
 701 * @adev: ACPI device object to match.
 702 * @of_match_table: List of device IDs to match against.
 703 * @of_id: OF ID if matched
 704 *
 705 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
 706 * identifiers and a _DSD object with the "compatible" property, use that
 707 * property to match against the given list of identifiers.
 708 */
 709static bool acpi_of_match_device(struct acpi_device *adev,
 710                                 const struct of_device_id *of_match_table,
 711                                 const struct of_device_id **of_id)
 712{
 713        const union acpi_object *of_compatible, *obj;
 714        int i, nval;
 715
 716        if (!adev)
 717                return false;
 718
 719        of_compatible = adev->data.of_compatible;
 720        if (!of_match_table || !of_compatible)
 721                return false;
 722
 723        if (of_compatible->type == ACPI_TYPE_PACKAGE) {
 724                nval = of_compatible->package.count;
 725                obj = of_compatible->package.elements;
 726        } else { /* Must be ACPI_TYPE_STRING. */
 727                nval = 1;
 728                obj = of_compatible;
 729        }
 730        /* Now we can look for the driver DT compatible strings */
 731        for (i = 0; i < nval; i++, obj++) {
 732                const struct of_device_id *id;
 733
 734                for (id = of_match_table; id->compatible[0]; id++)
 735                        if (!strcasecmp(obj->string.pointer, id->compatible)) {
 736                                if (of_id)
 737                                        *of_id = id;
 738                                return true;
 739                        }
 740        }
 741
 742        return false;
 743}
 744
 745static bool acpi_of_modalias(struct acpi_device *adev,
 746                             char *modalias, size_t len)
 747{
 748        const union acpi_object *of_compatible;
 749        const union acpi_object *obj;
 750        const char *str, *chr;
 751
 752        of_compatible = adev->data.of_compatible;
 753        if (!of_compatible)
 754                return false;
 755
 756        if (of_compatible->type == ACPI_TYPE_PACKAGE)
 757                obj = of_compatible->package.elements;
 758        else /* Must be ACPI_TYPE_STRING. */
 759                obj = of_compatible;
 760
 761        str = obj->string.pointer;
 762        chr = strchr(str, ',');
 763        strlcpy(modalias, chr ? chr + 1 : str, len);
 764
 765        return true;
 766}
 767
 768/**
 769 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
 770 * @adev:       ACPI device object to match
 771 * @default_id: ID string to use as default if no compatible string found
 772 * @modalias:   Pointer to buffer that modalias value will be copied into
 773 * @len:        Length of modalias buffer
 774 *
 775 * This is a counterpart of of_modalias_node() for struct acpi_device objects.
 776 * If there is a compatible string for @adev, it will be copied to @modalias
 777 * with the vendor prefix stripped; otherwise, @default_id will be used.
 778 */
 779void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
 780                       char *modalias, size_t len)
 781{
 782        if (!acpi_of_modalias(adev, modalias, len))
 783                strlcpy(modalias, default_id, len);
 784}
 785EXPORT_SYMBOL_GPL(acpi_set_modalias);
 786
 787static bool __acpi_match_device_cls(const struct acpi_device_id *id,
 788                                    struct acpi_hardware_id *hwid)
 789{
 790        int i, msk, byte_shift;
 791        char buf[3];
 792
 793        if (!id->cls)
 794                return false;
 795
 796        /* Apply class-code bitmask, before checking each class-code byte */
 797        for (i = 1; i <= 3; i++) {
 798                byte_shift = 8 * (3 - i);
 799                msk = (id->cls_msk >> byte_shift) & 0xFF;
 800                if (!msk)
 801                        continue;
 802
 803                sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
 804                if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
 805                        return false;
 806        }
 807        return true;
 808}
 809
 810static bool __acpi_match_device(struct acpi_device *device,
 811                                const struct acpi_device_id *acpi_ids,
 812                                const struct of_device_id *of_ids,
 813                                const struct acpi_device_id **acpi_id,
 814                                const struct of_device_id **of_id)
 815{
 816        const struct acpi_device_id *id;
 817        struct acpi_hardware_id *hwid;
 818
 819        /*
 820         * If the device is not present, it is unnecessary to load device
 821         * driver for it.
 822         */
 823        if (!device || !device->status.present)
 824                return false;
 825
 826        list_for_each_entry(hwid, &device->pnp.ids, list) {
 827                /* First, check the ACPI/PNP IDs provided by the caller. */
 828                if (acpi_ids) {
 829                        for (id = acpi_ids; id->id[0] || id->cls; id++) {
 830                                if (id->id[0] && !strcmp((char *)id->id, hwid->id))
 831                                        goto out_acpi_match;
 832                                if (id->cls && __acpi_match_device_cls(id, hwid))
 833                                        goto out_acpi_match;
 834                        }
 835                }
 836
 837                /*
 838                 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
 839                 * "compatible" property if found.
 840                 */
 841                if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
 842                        return acpi_of_match_device(device, of_ids, of_id);
 843        }
 844        return false;
 845
 846out_acpi_match:
 847        if (acpi_id)
 848                *acpi_id = id;
 849        return true;
 850}
 851
 852/**
 853 * acpi_match_device - Match a struct device against a given list of ACPI IDs
 854 * @ids: Array of struct acpi_device_id object to match against.
 855 * @dev: The device structure to match.
 856 *
 857 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 858 * object for that handle and use that object to match against a given list of
 859 * device IDs.
 860 *
 861 * Return a pointer to the first matching ID on success or %NULL on failure.
 862 */
 863const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 864                                               const struct device *dev)
 865{
 866        const struct acpi_device_id *id = NULL;
 867
 868        __acpi_match_device(acpi_companion_match(dev), ids, NULL, &id, NULL);
 869        return id;
 870}
 871EXPORT_SYMBOL_GPL(acpi_match_device);
 872
 873static const void *acpi_of_device_get_match_data(const struct device *dev)
 874{
 875        struct acpi_device *adev = ACPI_COMPANION(dev);
 876        const struct of_device_id *match = NULL;
 877
 878        if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match))
 879                return NULL;
 880
 881        return match->data;
 882}
 883
 884const void *acpi_device_get_match_data(const struct device *dev)
 885{
 886        const struct acpi_device_id *match;
 887
 888        if (!dev->driver->acpi_match_table)
 889                return acpi_of_device_get_match_data(dev);
 890
 891        match = acpi_match_device(dev->driver->acpi_match_table, dev);
 892        if (!match)
 893                return NULL;
 894
 895        return (const void *)match->driver_data;
 896}
 897EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
 898
 899int acpi_match_device_ids(struct acpi_device *device,
 900                          const struct acpi_device_id *ids)
 901{
 902        return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
 903}
 904EXPORT_SYMBOL(acpi_match_device_ids);
 905
 906bool acpi_driver_match_device(struct device *dev,
 907                              const struct device_driver *drv)
 908{
 909        if (!drv->acpi_match_table)
 910                return acpi_of_match_device(ACPI_COMPANION(dev),
 911                                            drv->of_match_table,
 912                                            NULL);
 913
 914        return __acpi_match_device(acpi_companion_match(dev),
 915                                   drv->acpi_match_table, drv->of_match_table,
 916                                   NULL, NULL);
 917}
 918EXPORT_SYMBOL_GPL(acpi_driver_match_device);
 919
 920/* --------------------------------------------------------------------------
 921                              ACPI Driver Management
 922   -------------------------------------------------------------------------- */
 923
 924/**
 925 * acpi_bus_register_driver - register a driver with the ACPI bus
 926 * @driver: driver being registered
 927 *
 928 * Registers a driver with the ACPI bus.  Searches the namespace for all
 929 * devices that match the driver's criteria and binds.  Returns zero for
 930 * success or a negative error status for failure.
 931 */
 932int acpi_bus_register_driver(struct acpi_driver *driver)
 933{
 934        int ret;
 935
 936        if (acpi_disabled)
 937                return -ENODEV;
 938        driver->drv.name = driver->name;
 939        driver->drv.bus = &acpi_bus_type;
 940        driver->drv.owner = driver->owner;
 941
 942        ret = driver_register(&driver->drv);
 943        return ret;
 944}
 945
 946EXPORT_SYMBOL(acpi_bus_register_driver);
 947
 948/**
 949 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
 950 * @driver: driver to unregister
 951 *
 952 * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 953 * devices that match the driver's criteria and unbinds.
 954 */
 955void acpi_bus_unregister_driver(struct acpi_driver *driver)
 956{
 957        driver_unregister(&driver->drv);
 958}
 959
 960EXPORT_SYMBOL(acpi_bus_unregister_driver);
 961
 962/* --------------------------------------------------------------------------
 963                              ACPI Bus operations
 964   -------------------------------------------------------------------------- */
 965
 966static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 967{
 968        struct acpi_device *acpi_dev = to_acpi_device(dev);
 969        struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 970
 971        return acpi_dev->flags.match_driver
 972                && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 973}
 974
 975static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 976{
 977        return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
 978}
 979
 980static int acpi_device_probe(struct device *dev)
 981{
 982        struct acpi_device *acpi_dev = to_acpi_device(dev);
 983        struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 984        int ret;
 985
 986        if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
 987                return -EINVAL;
 988
 989        if (!acpi_drv->ops.add)
 990                return -ENOSYS;
 991
 992        ret = acpi_drv->ops.add(acpi_dev);
 993        if (ret)
 994                return ret;
 995
 996        acpi_dev->driver = acpi_drv;
 997
 998        pr_debug("Driver [%s] successfully bound to device [%s]\n",
 999                 acpi_drv->name, acpi_dev->pnp.bus_id);
1000
1001        if (acpi_drv->ops.notify) {
1002                ret = acpi_device_install_notify_handler(acpi_dev);
1003                if (ret) {
1004                        if (acpi_drv->ops.remove)
1005                                acpi_drv->ops.remove(acpi_dev);
1006
1007                        acpi_dev->driver = NULL;
1008                        acpi_dev->driver_data = NULL;
1009                        return ret;
1010                }
1011        }
1012
1013        pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name,
1014                 acpi_dev->pnp.bus_id);
1015
1016        get_device(dev);
1017        return 0;
1018}
1019
1020static int acpi_device_remove(struct device *dev)
1021{
1022        struct acpi_device *acpi_dev = to_acpi_device(dev);
1023        struct acpi_driver *acpi_drv = acpi_dev->driver;
1024
1025        if (acpi_drv) {
1026                if (acpi_drv->ops.notify)
1027                        acpi_device_remove_notify_handler(acpi_dev);
1028                if (acpi_drv->ops.remove)
1029                        acpi_drv->ops.remove(acpi_dev);
1030        }
1031        acpi_dev->driver = NULL;
1032        acpi_dev->driver_data = NULL;
1033
1034        put_device(dev);
1035        return 0;
1036}
1037
1038struct bus_type acpi_bus_type = {
1039        .name           = "acpi",
1040        .match          = acpi_bus_match,
1041        .probe          = acpi_device_probe,
1042        .remove         = acpi_device_remove,
1043        .uevent         = acpi_device_uevent,
1044};
1045
1046/* --------------------------------------------------------------------------
1047                             Initialization/Cleanup
1048   -------------------------------------------------------------------------- */
1049
1050static int __init acpi_bus_init_irq(void)
1051{
1052        acpi_status status;
1053        char *message = NULL;
1054
1055
1056        /*
1057         * Let the system know what interrupt model we are using by
1058         * evaluating the \_PIC object, if exists.
1059         */
1060
1061        switch (acpi_irq_model) {
1062        case ACPI_IRQ_MODEL_PIC:
1063                message = "PIC";
1064                break;
1065        case ACPI_IRQ_MODEL_IOAPIC:
1066                message = "IOAPIC";
1067                break;
1068        case ACPI_IRQ_MODEL_IOSAPIC:
1069                message = "IOSAPIC";
1070                break;
1071        case ACPI_IRQ_MODEL_GIC:
1072                message = "GIC";
1073                break;
1074        case ACPI_IRQ_MODEL_PLATFORM:
1075                message = "platform specific model";
1076                break;
1077        default:
1078                pr_info("Unknown interrupt routing model\n");
1079                return -ENODEV;
1080        }
1081
1082        pr_info("Using %s for interrupt routing\n", message);
1083
1084        status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1085        if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1086                pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status));
1087                return -ENODEV;
1088        }
1089
1090        return 0;
1091}
1092
1093/**
1094 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1095 *
1096 * The ACPI tables are accessible after this, but the handling of events has not
1097 * been initialized and the global lock is not available yet, so AML should not
1098 * be executed at this point.
1099 *
1100 * Doing this before switching the EFI runtime services to virtual mode allows
1101 * the EfiBootServices memory to be freed slightly earlier on boot.
1102 */
1103void __init acpi_early_init(void)
1104{
1105        acpi_status status;
1106
1107        if (acpi_disabled)
1108                return;
1109
1110        pr_info("Core revision %08x\n", ACPI_CA_VERSION);
1111
1112        /* enable workarounds, unless strict ACPI spec. compliance */
1113        if (!acpi_strict)
1114                acpi_gbl_enable_interpreter_slack = TRUE;
1115
1116        acpi_permanent_mmap = true;
1117
1118#ifdef CONFIG_X86
1119        /*
1120         * If the machine falls into the DMI check table,
1121         * DSDT will be copied to memory.
1122         * Note that calling dmi_check_system() here on other architectures
1123         * would not be OK because only x86 initializes dmi early enough.
1124         * Thankfully only x86 systems need such quirks for now.
1125         */
1126        dmi_check_system(dsdt_dmi_table);
1127#endif
1128
1129        status = acpi_reallocate_root_table();
1130        if (ACPI_FAILURE(status)) {
1131                pr_err("Unable to reallocate ACPI tables\n");
1132                goto error0;
1133        }
1134
1135        status = acpi_initialize_subsystem();
1136        if (ACPI_FAILURE(status)) {
1137                pr_err("Unable to initialize the ACPI Interpreter\n");
1138                goto error0;
1139        }
1140
1141#ifdef CONFIG_X86
1142        if (!acpi_ioapic) {
1143                /* compatible (0) means level (3) */
1144                if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1145                        acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1146                        acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1147                }
1148                /* Set PIC-mode SCI trigger type */
1149                acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1150                                         (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1151        } else {
1152                /*
1153                 * now that acpi_gbl_FADT is initialized,
1154                 * update it with result from INT_SRC_OVR parsing
1155                 */
1156                acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1157        }
1158#endif
1159        return;
1160
1161 error0:
1162        disable_acpi();
1163}
1164
1165/**
1166 * acpi_subsystem_init - Finalize the early initialization of ACPI.
1167 *
1168 * Switch over the platform to the ACPI mode (if possible).
1169 *
1170 * Doing this too early is generally unsafe, but at the same time it needs to be
1171 * done before all things that really depend on ACPI.  The right spot appears to
1172 * be before finalizing the EFI initialization.
1173 */
1174void __init acpi_subsystem_init(void)
1175{
1176        acpi_status status;
1177
1178        if (acpi_disabled)
1179                return;
1180
1181        status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1182        if (ACPI_FAILURE(status)) {
1183                pr_err("Unable to enable ACPI\n");
1184                disable_acpi();
1185        } else {
1186                /*
1187                 * If the system is using ACPI then we can be reasonably
1188                 * confident that any regulators are managed by the firmware
1189                 * so tell the regulator core it has everything it needs to
1190                 * know.
1191                 */
1192                regulator_has_full_constraints();
1193        }
1194}
1195
1196static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1197{
1198        acpi_scan_table_handler(event, table, context);
1199
1200        return acpi_sysfs_table_handler(event, table, context);
1201}
1202
1203static int __init acpi_bus_init(void)
1204{
1205        int result;
1206        acpi_status status;
1207
1208        acpi_os_initialize1();
1209
1210        status = acpi_load_tables();
1211        if (ACPI_FAILURE(status)) {
1212                pr_err("Unable to load the System Description Tables\n");
1213                goto error1;
1214        }
1215
1216        /*
1217         * ACPI 2.0 requires the EC driver to be loaded and work before the EC
1218         * device is found in the namespace.
1219         *
1220         * This is accomplished by looking for the ECDT table and getting the EC
1221         * parameters out of that.
1222         *
1223         * Do that before calling acpi_initialize_objects() which may trigger EC
1224         * address space accesses.
1225         */
1226        acpi_ec_ecdt_probe();
1227
1228        status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1229        if (ACPI_FAILURE(status)) {
1230                pr_err("Unable to start the ACPI Interpreter\n");
1231                goto error1;
1232        }
1233
1234        status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1235        if (ACPI_FAILURE(status)) {
1236                pr_err("Unable to initialize ACPI objects\n");
1237                goto error1;
1238        }
1239
1240        /* Set capability bits for _OSC under processor scope */
1241        acpi_early_processor_osc();
1242
1243        /*
1244         * _OSC method may exist in module level code,
1245         * so it must be run after ACPI_FULL_INITIALIZATION
1246         */
1247        acpi_bus_osc_negotiate_platform_control();
1248        acpi_bus_osc_negotiate_usb_control();
1249
1250        /*
1251         * _PDC control method may load dynamic SSDT tables,
1252         * and we need to install the table handler before that.
1253         */
1254        status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1255
1256        acpi_sysfs_init();
1257
1258        acpi_early_processor_set_pdc();
1259
1260        /*
1261         * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1262         * is necessary to enable it as early as possible.
1263         */
1264        acpi_ec_dsdt_probe();
1265
1266        pr_info("Interpreter enabled\n");
1267
1268        /* Initialize sleep structures */
1269        acpi_sleep_init();
1270
1271        /*
1272         * Get the system interrupt model and evaluate \_PIC.
1273         */
1274        result = acpi_bus_init_irq();
1275        if (result)
1276                goto error1;
1277
1278        /*
1279         * Register the for all standard device notifications.
1280         */
1281        status =
1282            acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1283                                        &acpi_bus_notify, NULL);
1284        if (ACPI_FAILURE(status)) {
1285                pr_err("Unable to register for system notifications\n");
1286                goto error1;
1287        }
1288
1289        /*
1290         * Create the top ACPI proc directory
1291         */
1292        acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1293
1294        result = bus_register(&acpi_bus_type);
1295        if (!result)
1296                return 0;
1297
1298        /* Mimic structured exception handling */
1299      error1:
1300        acpi_terminate();
1301        return -ENODEV;
1302}
1303
1304struct kobject *acpi_kobj;
1305EXPORT_SYMBOL_GPL(acpi_kobj);
1306
1307static int __init acpi_init(void)
1308{
1309        int result;
1310
1311        if (acpi_disabled) {
1312                pr_info("Interpreter disabled.\n");
1313                return -ENODEV;
1314        }
1315
1316        acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1317        if (!acpi_kobj) {
1318                pr_debug("%s: kset create error\n", __func__);
1319                acpi_kobj = NULL;
1320        }
1321
1322        result = acpi_bus_init();
1323        if (result) {
1324                kobject_put(acpi_kobj);
1325                disable_acpi();
1326                return result;
1327        }
1328
1329        pci_mmcfg_late_init();
1330        acpi_iort_init();
1331        acpi_scan_init();
1332        acpi_ec_init();
1333        acpi_debugfs_init();
1334        acpi_sleep_proc_init();
1335        acpi_wakeup_device_init();
1336        acpi_debugger_init();
1337        acpi_setup_sb_notify_handler();
1338        return 0;
1339}
1340
1341subsys_initcall(acpi_init);
1342