drivers/acpi/bus.c

   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
  36 struct acpi_device *acpi_root;
  37 struct proc_dir_entry *acpi_root_dir;
  38 EXPORT_SYMBOL(acpi_root_dir);
  39
  40 #ifdef CONFIG_X86
  41 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  42 static inline int set_copy_dsdt(const struct dmi_system_id *id)
  43 {
  44         return 0;
  45 }
  46 #else
  47 static 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
  55 static 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
  76 acpi_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 }
  92 EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);
  93
  94 int 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 }
 124 EXPORT_SYMBOL(acpi_bus_get_status);
 125
 126 void acpi_bus_private_data_handler(acpi_handle handle,
 127                                    void *context)
 128 {
 129         return;
 130 }
 131 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 132
 133 int 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 }
 146 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
 147
 148 int 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 }
 163 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
 164
 165 void acpi_bus_detach_private_data(acpi_handle handle)
 166 {
 167         acpi_detach_data(handle, acpi_bus_private_data_handler);
 168 }
 169 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
 170
 171 static 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
 185 acpi_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         }
 253 out_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
 263 out_kfree:
 264         kfree(output.pointer);
 265         if (status != AE_OK)
 266                 context->ret.pointer = NULL;
 267         return status;
 268 }
 269 EXPORT_SYMBOL(acpi_run_osc);
 270
 271 bool 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  */
 277 bool osc_pc_lpi_support_confirmed;
 278 EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
 279
 280 /*
 281  * ACPI 6.4 Operating System Capabilities for USB.
 282  */
 283 bool osc_sb_native_usb4_support_confirmed;
 284 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed);
 285
 286 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 287 static 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  */
 357 u32 osc_sb_native_usb4_control;
 358 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control);
 359
 360 static 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
 369 static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A";
 370 static 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
 412 out_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  */
 425 static 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
 499 static 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
 506 static 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
 514 static 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
 520 static 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
 545 static 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
 563 static 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
 583 static 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
 594 static 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  */
 618 struct 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 }
 637 EXPORT_SYMBOL_GPL(acpi_get_first_physical_node);
 638
 639 static 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  */
 658 bool 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  */
 685 struct 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  */
 709 static 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
 745 static 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  */
 779 void 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 }
 785 EXPORT_SYMBOL_GPL(acpi_set_modalias);
 786
 787 static 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
 810 static 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
 846 out_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  */
 863 const 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 }
 871 EXPORT_SYMBOL_GPL(acpi_match_device);
 872
 873 static 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
 884 const 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 }
 897 EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
 898
 899 int 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 }
 904 EXPORT_SYMBOL(acpi_match_device_ids);
 905
 906 bool 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 }
 918 EXPORT_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  */
 932 int 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
 946 EXPORT_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  */
 955 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 956 {
 957         driver_unregister(&driver->drv);
 958 }
 959
 960 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 961
 962 /* --------------------------------------------------------------------------
 963                               ACPI Bus operations
 964    -------------------------------------------------------------------------- */
 965
 966 static 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
 975 static 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
 980 static 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
1020 static 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
1038 struct 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
1050 static 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  */
1103 void __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  */
1174 void __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
1196 static 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
1203 static 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
1304 struct kobject *acpi_kobj;
1305 EXPORT_SYMBOL_GPL(acpi_kobj);
1306
1307 static 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                 disable_acpi();
1325                 return result;
1326         }
1327
1328         pci_mmcfg_late_init();
1329         acpi_iort_init();
1330         acpi_scan_init();
1331         acpi_ec_init();
1332         acpi_debugfs_init();
1333         acpi_sleep_proc_init();
1334         acpi_wakeup_device_init();
1335         acpi_debugger_init();
1336         acpi_setup_sb_notify_handler();
1337         return 0;
1338 }
1339
1340 subsys_initcall(acpi_init);