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/acpi_viot.h>
  31 #include <linux/pci.h>
  32 #include <acpi/apei.h>
  33 #include <linux/suspend.h>
  34 #include <linux/prmt.h>
  35
  36 #include "internal.h"
  37
  38 struct acpi_device *acpi_root;
  39 struct proc_dir_entry *acpi_root_dir;
  40 EXPORT_SYMBOL(acpi_root_dir);
  41
  42 #ifdef CONFIG_X86
  43 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  44 static inline int set_copy_dsdt(const struct dmi_system_id *id)
  45 {
  46         return 0;
  47 }
  48 #else
  49 static int set_copy_dsdt(const struct dmi_system_id *id)
  50 {
  51         pr_notice("%s detected - force copy of DSDT to local memory\n", id->ident);
  52         acpi_gbl_copy_dsdt_locally = 1;
  53         return 0;
  54 }
  55 #endif
  56
  57 static const struct dmi_system_id dsdt_dmi_table[] __initconst = {
  58         /*
  59          * Invoke DSDT corruption work-around on all Toshiba Satellite.
  60          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
  61          */
  62         {
  63          .callback = set_copy_dsdt,
  64          .ident = "TOSHIBA Satellite",
  65          .matches = {
  66                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  67                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
  68                 },
  69         },
  70         {}
  71 };
  72 #endif
  73
  74 /* --------------------------------------------------------------------------
  75                                 Device Management
  76    -------------------------------------------------------------------------- */
  77
  78 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
  79                                        unsigned long long *sta)
  80 {
  81         acpi_status status;
  82
  83         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
  84         if (ACPI_SUCCESS(status))
  85                 return AE_OK;
  86
  87         if (status == AE_NOT_FOUND) {
  88                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
  89                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
  90                 return AE_OK;
  91         }
  92         return status;
  93 }
  94 EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);
  95
  96 int acpi_bus_get_status(struct acpi_device *device)
  97 {
  98         acpi_status status;
  99         unsigned long long sta;
 100
 101         if (acpi_device_override_status(device, &sta)) {
 102                 acpi_set_device_status(device, sta);
 103                 return 0;
 104         }
 105
 106         /* Battery devices must have their deps met before calling _STA */
 107         if (acpi_device_is_battery(device) && device->dep_unmet) {
 108                 acpi_set_device_status(device, 0);
 109                 return 0;
 110         }
 111
 112         status = acpi_bus_get_status_handle(device->handle, &sta);
 113         if (ACPI_FAILURE(status))
 114                 return -ENODEV;
 115
 116         acpi_set_device_status(device, sta);
 117
 118         if (device->status.functional && !device->status.present) {
 119                 pr_debug("Device [%s] status [%08x]: functional but not present\n",
 120                          device->pnp.bus_id, (u32)sta);
 121         }
 122
 123         pr_debug("Device [%s] status [%08x]\n", device->pnp.bus_id, (u32)sta);
 124         return 0;
 125 }
 126 EXPORT_SYMBOL(acpi_bus_get_status);
 127
 128 void acpi_bus_private_data_handler(acpi_handle handle,
 129                                    void *context)
 130 {
 131         return;
 132 }
 133 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 134
 135 int acpi_bus_attach_private_data(acpi_handle handle, void *data)
 136 {
 137         acpi_status status;
 138
 139         status = acpi_attach_data(handle,
 140                         acpi_bus_private_data_handler, data);
 141         if (ACPI_FAILURE(status)) {
 142                 acpi_handle_debug(handle, "Error attaching device data\n");
 143                 return -ENODEV;
 144         }
 145
 146         return 0;
 147 }
 148 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
 149
 150 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 151 {
 152         acpi_status status;
 153
 154         if (!data)
 155                 return -EINVAL;
 156
 157         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 158         if (ACPI_FAILURE(status)) {
 159                 acpi_handle_debug(handle, "No context for object\n");
 160                 return -ENODEV;
 161         }
 162
 163         return 0;
 164 }
 165 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
 166
 167 void acpi_bus_detach_private_data(acpi_handle handle)
 168 {
 169         acpi_detach_data(handle, acpi_bus_private_data_handler);
 170 }
 171 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
 172
 173 static void acpi_print_osc_error(acpi_handle handle,
 174                                  struct acpi_osc_context *context, char *error)
 175 {
 176         int i;
 177
 178         acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);
 179
 180         pr_debug("_OSC request data:");
 181         for (i = 0; i < context->cap.length; i += sizeof(u32))
 182                 pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));
 183
 184         pr_debug("\n");
 185 }
 186
 187 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 188 {
 189         acpi_status status;
 190         struct acpi_object_list input;
 191         union acpi_object in_params[4];
 192         union acpi_object *out_obj;
 193         guid_t guid;
 194         u32 errors;
 195         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 196
 197         if (!context)
 198                 return AE_ERROR;
 199         if (guid_parse(context->uuid_str, &guid))
 200                 return AE_ERROR;
 201         context->ret.length = ACPI_ALLOCATE_BUFFER;
 202         context->ret.pointer = NULL;
 203
 204         /* Setting up input parameters */
 205         input.count = 4;
 206         input.pointer = in_params;
 207         in_params[0].type               = ACPI_TYPE_BUFFER;
 208         in_params[0].buffer.length      = 16;
 209         in_params[0].buffer.pointer     = (u8 *)&guid;
 210         in_params[1].type               = ACPI_TYPE_INTEGER;
 211         in_params[1].integer.value      = context->rev;
 212         in_params[2].type               = ACPI_TYPE_INTEGER;
 213         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 214         in_params[3].type               = ACPI_TYPE_BUFFER;
 215         in_params[3].buffer.length      = context->cap.length;
 216         in_params[3].buffer.pointer     = context->cap.pointer;
 217
 218         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 219         if (ACPI_FAILURE(status))
 220                 return status;
 221
 222         if (!output.length)
 223                 return AE_NULL_OBJECT;
 224
 225         out_obj = output.pointer;
 226         if (out_obj->type != ACPI_TYPE_BUFFER
 227                 || out_obj->buffer.length != context->cap.length) {
 228                 acpi_print_osc_error(handle, context,
 229                         "_OSC evaluation returned wrong type");
 230                 status = AE_TYPE;
 231                 goto out_kfree;
 232         }
 233         /* Need to ignore the bit0 in result code */
 234         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 235         if (errors) {
 236                 if (errors & OSC_REQUEST_ERROR)
 237                         acpi_print_osc_error(handle, context,
 238                                 "_OSC request failed");
 239                 if (errors & OSC_INVALID_UUID_ERROR)
 240                         acpi_print_osc_error(handle, context,
 241                                 "_OSC invalid UUID");
 242                 if (errors & OSC_INVALID_REVISION_ERROR)
 243                         acpi_print_osc_error(handle, context,
 244                                 "_OSC invalid revision");
 245                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 246                         if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
 247                             & OSC_QUERY_ENABLE)
 248                                 goto out_success;
 249                         status = AE_SUPPORT;
 250                         goto out_kfree;
 251                 }
 252                 status = AE_ERROR;
 253                 goto out_kfree;
 254         }
 255 out_success:
 256         context->ret.length = out_obj->buffer.length;
 257         context->ret.pointer = kmemdup(out_obj->buffer.pointer,
 258                                        context->ret.length, GFP_KERNEL);
 259         if (!context->ret.pointer) {
 260                 status =  AE_NO_MEMORY;
 261                 goto out_kfree;
 262         }
 263         status =  AE_OK;
 264
 265 out_kfree:
 266         kfree(output.pointer);
 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         if (IS_ENABLED(CONFIG_ACPI_PRMT))
 308                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PRM_SUPPORT;
 309
 310 #ifdef CONFIG_ARM64
 311         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
 312 #endif
 313 #ifdef CONFIG_X86
 314         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
 315         if (boot_cpu_has(X86_FEATURE_HWP)) {
 316                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
 317                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
 318         }
 319 #endif
 320
 321         if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
 322                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
 323
 324         if (IS_ENABLED(CONFIG_USB4))
 325                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_NATIVE_USB4_SUPPORT;
 326
 327         if (!ghes_disable)
 328                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
 329         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 330                 return;
 331
 332         if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
 333                 return;
 334
 335         kfree(context.ret.pointer);
 336
 337         /* Now run _OSC again with query flag clear */
 338         capbuf[OSC_QUERY_DWORD] = 0;
 339
 340         if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
 341                 return;
 342
 343         capbuf_ret = context.ret.pointer;
 344         osc_sb_apei_support_acked =
 345                 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
 346         osc_pc_lpi_support_confirmed =
 347                 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
 348         osc_sb_native_usb4_support_confirmed =
 349                 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT;
 350
 351         kfree(context.ret.pointer);
 352 }
 353
 354 /*
 355  * Native control of USB4 capabilities. If any of the tunneling bits is
 356  * set it means OS is in control and we use software based connection
 357  * manager.
 358  */
 359 u32 osc_sb_native_usb4_control;
 360 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control);
 361
 362 static void acpi_bus_decode_usb_osc(const char *msg, u32 bits)
 363 {
 364         pr_info("%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg,
 365                (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-',
 366                (bits & OSC_USB_DP_TUNNELING) ? '+' : '-',
 367                (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-',
 368                (bits & OSC_USB_XDOMAIN) ? '+' : '-');
 369 }
 370
 371 static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A";
 372 static void acpi_bus_osc_negotiate_usb_control(void)
 373 {
 374         u32 capbuf[3];
 375         struct acpi_osc_context context = {
 376                 .uuid_str = sb_usb_uuid_str,
 377                 .rev = 1,
 378                 .cap.length = sizeof(capbuf),
 379                 .cap.pointer = capbuf,
 380         };
 381         acpi_handle handle;
 382         acpi_status status;
 383         u32 control;
 384
 385         if (!osc_sb_native_usb4_support_confirmed)
 386                 return;
 387
 388         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 389                 return;
 390
 391         control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING |
 392                   OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN;
 393
 394         capbuf[OSC_QUERY_DWORD] = 0;
 395         capbuf[OSC_SUPPORT_DWORD] = 0;
 396         capbuf[OSC_CONTROL_DWORD] = control;
 397
 398         status = acpi_run_osc(handle, &context);
 399         if (ACPI_FAILURE(status))
 400                 return;
 401
 402         if (context.ret.length != sizeof(capbuf)) {
 403                 pr_info("USB4 _OSC: returned invalid length buffer\n");
 404                 goto out_free;
 405         }
 406
 407         osc_sb_native_usb4_control =
 408                 control & ((u32 *)context.ret.pointer)[OSC_CONTROL_DWORD];
 409
 410         acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control);
 411         acpi_bus_decode_usb_osc("USB4 _OSC: OS controls",
 412                                 osc_sb_native_usb4_control);
 413
 414 out_free:
 415         kfree(context.ret.pointer);
 416 }
 417
 418 /* --------------------------------------------------------------------------
 419                              Notification Handling
 420    -------------------------------------------------------------------------- */
 421
 422 /**
 423  * acpi_bus_notify
 424  * ---------------
 425  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 426  */
 427 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 428 {
 429         struct acpi_device *adev;
 430         struct acpi_driver *driver;
 431         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 432         bool hotplug_event = false;
 433
 434         switch (type) {
 435         case ACPI_NOTIFY_BUS_CHECK:
 436                 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
 437                 hotplug_event = true;
 438                 break;
 439
 440         case ACPI_NOTIFY_DEVICE_CHECK:
 441                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
 442                 hotplug_event = true;
 443                 break;
 444
 445         case ACPI_NOTIFY_DEVICE_WAKE:
 446                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
 447                 break;
 448
 449         case ACPI_NOTIFY_EJECT_REQUEST:
 450                 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
 451                 hotplug_event = true;
 452                 break;
 453
 454         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 455                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
 456                 /* TBD: Exactly what does 'light' mean? */
 457                 break;
 458
 459         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 460                 acpi_handle_err(handle, "Device cannot be configured due "
 461                                 "to a frequency mismatch\n");
 462                 break;
 463
 464         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 465                 acpi_handle_err(handle, "Device cannot be configured due "
 466                                 "to a bus mode mismatch\n");
 467                 break;
 468
 469         case ACPI_NOTIFY_POWER_FAULT:
 470                 acpi_handle_err(handle, "Device has suffered a power fault\n");
 471                 break;
 472
 473         default:
 474                 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
 475                 break;
 476         }
 477
 478         adev = acpi_bus_get_acpi_device(handle);
 479         if (!adev)
 480                 goto err;
 481
 482         driver = adev->driver;
 483         if (driver && driver->ops.notify &&
 484             (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 485                 driver->ops.notify(adev, type);
 486
 487         if (!hotplug_event) {
 488                 acpi_bus_put_acpi_device(adev);
 489                 return;
 490         }
 491
 492         if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
 493                 return;
 494
 495         acpi_bus_put_acpi_device(adev);
 496
 497  err:
 498         acpi_evaluate_ost(handle, type, ost_code, NULL);
 499 }
 500
 501 static void acpi_notify_device(acpi_handle handle, u32 event, void *data)
 502 {
 503         struct acpi_device *device = data;
 504
 505         device->driver->ops.notify(device, event);
 506 }
 507
 508 static void acpi_notify_device_fixed(void *data)
 509 {
 510         struct acpi_device *device = data;
 511
 512         /* Fixed hardware devices have no handles */
 513         acpi_notify_device(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 514 }
 515
 516 static u32 acpi_device_fixed_event(void *data)
 517 {
 518         acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_notify_device_fixed, data);
 519         return ACPI_INTERRUPT_HANDLED;
 520 }
 521
 522 static int acpi_device_install_notify_handler(struct acpi_device *device)
 523 {
 524         acpi_status status;
 525
 526         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 527                 status =
 528                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 529                                                      acpi_device_fixed_event,
 530                                                      device);
 531         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 532                 status =
 533                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 534                                                      acpi_device_fixed_event,
 535                                                      device);
 536         else
 537                 status = acpi_install_notify_handler(device->handle,
 538                                                      ACPI_DEVICE_NOTIFY,
 539                                                      acpi_notify_device,
 540                                                      device);
 541
 542         if (ACPI_FAILURE(status))
 543                 return -EINVAL;
 544         return 0;
 545 }
 546
 547 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 548 {
 549         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 550                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 551                                                 acpi_device_fixed_event);
 552         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 553                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 554                                                 acpi_device_fixed_event);
 555         else
 556                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 557                                            acpi_notify_device);
 558 }
 559
 560 /* Handle events targeting \_SB device (at present only graceful shutdown) */
 561
 562 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
 563 #define ACPI_SB_INDICATE_INTERVAL       10000
 564
 565 static void sb_notify_work(struct work_struct *dummy)
 566 {
 567         acpi_handle sb_handle;
 568
 569         orderly_poweroff(true);
 570
 571         /*
 572          * After initiating graceful shutdown, the ACPI spec requires OSPM
 573          * to evaluate _OST method once every 10seconds to indicate that
 574          * the shutdown is in progress
 575          */
 576         acpi_get_handle(NULL, "\\_SB", &sb_handle);
 577         while (1) {
 578                 pr_info("Graceful shutdown in progress.\n");
 579                 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
 580                                 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
 581                 msleep(ACPI_SB_INDICATE_INTERVAL);
 582         }
 583 }
 584
 585 static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
 586 {
 587         static DECLARE_WORK(acpi_sb_work, sb_notify_work);
 588
 589         if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
 590                 if (!work_busy(&acpi_sb_work))
 591                         schedule_work(&acpi_sb_work);
 592         } else
 593                 pr_warn("event %x is not supported by \\_SB device\n", event);
 594 }
 595
 596 static int __init acpi_setup_sb_notify_handler(void)
 597 {
 598         acpi_handle sb_handle;
 599
 600         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
 601                 return -ENXIO;
 602
 603         if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
 604                                                 acpi_sb_notify, NULL)))
 605                 return -EINVAL;
 606
 607         return 0;
 608 }
 609
 610 /* --------------------------------------------------------------------------
 611                              Device Matching
 612    -------------------------------------------------------------------------- */
 613
 614 /**
 615  * acpi_get_first_physical_node - Get first physical node of an ACPI device
 616  * @adev:       ACPI device in question
 617  *
 618  * Return: First physical node of ACPI device @adev
 619  */
 620 struct device *acpi_get_first_physical_node(struct acpi_device *adev)
 621 {
 622         struct mutex *physical_node_lock = &adev->physical_node_lock;
 623         struct device *phys_dev;
 624
 625         mutex_lock(physical_node_lock);
 626         if (list_empty(&adev->physical_node_list)) {
 627                 phys_dev = NULL;
 628         } else {
 629                 const struct acpi_device_physical_node *node;
 630
 631                 node = list_first_entry(&adev->physical_node_list,
 632                                         struct acpi_device_physical_node, node);
 633
 634                 phys_dev = node->dev;
 635         }
 636         mutex_unlock(physical_node_lock);
 637         return phys_dev;
 638 }
 639 EXPORT_SYMBOL_GPL(acpi_get_first_physical_node);
 640
 641 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
 642                                                       const struct device *dev)
 643 {
 644         const struct device *phys_dev = acpi_get_first_physical_node(adev);
 645
 646         return phys_dev && phys_dev == dev ? adev : NULL;
 647 }
 648
 649 /**
 650  * acpi_device_is_first_physical_node - Is given dev first physical node
 651  * @adev: ACPI companion device
 652  * @dev: Physical device to check
 653  *
 654  * Function checks if given @dev is the first physical devices attached to
 655  * the ACPI companion device. This distinction is needed in some cases
 656  * where the same companion device is shared between many physical devices.
 657  *
 658  * Note that the caller have to provide valid @adev pointer.
 659  */
 660 bool acpi_device_is_first_physical_node(struct acpi_device *adev,
 661                                         const struct device *dev)
 662 {
 663         return !!acpi_primary_dev_companion(adev, dev);
 664 }
 665
 666 /*
 667  * acpi_companion_match() - Can we match via ACPI companion device
 668  * @dev: Device in question
 669  *
 670  * Check if the given device has an ACPI companion and if that companion has
 671  * a valid list of PNP IDs, and if the device is the first (primary) physical
 672  * device associated with it.  Return the companion pointer if that's the case
 673  * or NULL otherwise.
 674  *
 675  * If multiple physical devices are attached to a single ACPI companion, we need
 676  * to be careful.  The usage scenario for this kind of relationship is that all
 677  * of the physical devices in question use resources provided by the ACPI
 678  * companion.  A typical case is an MFD device where all the sub-devices share
 679  * the parent's ACPI companion.  In such cases we can only allow the primary
 680  * (first) physical device to be matched with the help of the companion's PNP
 681  * IDs.
 682  *
 683  * Additional physical devices sharing the ACPI companion can still use
 684  * resources available from it but they will be matched normally using functions
 685  * provided by their bus types (and analogously for their modalias).
 686  */
 687 struct acpi_device *acpi_companion_match(const struct device *dev)
 688 {
 689         struct acpi_device *adev;
 690
 691         adev = ACPI_COMPANION(dev);
 692         if (!adev)
 693                 return NULL;
 694
 695         if (list_empty(&adev->pnp.ids))
 696                 return NULL;
 697
 698         return acpi_primary_dev_companion(adev, dev);
 699 }
 700
 701 /**
 702  * acpi_of_match_device - Match device object using the "compatible" property.
 703  * @adev: ACPI device object to match.
 704  * @of_match_table: List of device IDs to match against.
 705  * @of_id: OF ID if matched
 706  *
 707  * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
 708  * identifiers and a _DSD object with the "compatible" property, use that
 709  * property to match against the given list of identifiers.
 710  */
 711 static bool acpi_of_match_device(struct acpi_device *adev,
 712                                  const struct of_device_id *of_match_table,
 713                                  const struct of_device_id **of_id)
 714 {
 715         const union acpi_object *of_compatible, *obj;
 716         int i, nval;
 717
 718         if (!adev)
 719                 return false;
 720
 721         of_compatible = adev->data.of_compatible;
 722         if (!of_match_table || !of_compatible)
 723                 return false;
 724
 725         if (of_compatible->type == ACPI_TYPE_PACKAGE) {
 726                 nval = of_compatible->package.count;
 727                 obj = of_compatible->package.elements;
 728         } else { /* Must be ACPI_TYPE_STRING. */
 729                 nval = 1;
 730                 obj = of_compatible;
 731         }
 732         /* Now we can look for the driver DT compatible strings */
 733         for (i = 0; i < nval; i++, obj++) {
 734                 const struct of_device_id *id;
 735
 736                 for (id = of_match_table; id->compatible[0]; id++)
 737                         if (!strcasecmp(obj->string.pointer, id->compatible)) {
 738                                 if (of_id)
 739                                         *of_id = id;
 740                                 return true;
 741                         }
 742         }
 743
 744         return false;
 745 }
 746
 747 static bool acpi_of_modalias(struct acpi_device *adev,
 748                              char *modalias, size_t len)
 749 {
 750         const union acpi_object *of_compatible;
 751         const union acpi_object *obj;
 752         const char *str, *chr;
 753
 754         of_compatible = adev->data.of_compatible;
 755         if (!of_compatible)
 756                 return false;
 757
 758         if (of_compatible->type == ACPI_TYPE_PACKAGE)
 759                 obj = of_compatible->package.elements;
 760         else /* Must be ACPI_TYPE_STRING. */
 761                 obj = of_compatible;
 762
 763         str = obj->string.pointer;
 764         chr = strchr(str, ',');
 765         strlcpy(modalias, chr ? chr + 1 : str, len);
 766
 767         return true;
 768 }
 769
 770 /**
 771  * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
 772  * @adev:       ACPI device object to match
 773  * @default_id: ID string to use as default if no compatible string found
 774  * @modalias:   Pointer to buffer that modalias value will be copied into
 775  * @len:        Length of modalias buffer
 776  *
 777  * This is a counterpart of of_modalias_node() for struct acpi_device objects.
 778  * If there is a compatible string for @adev, it will be copied to @modalias
 779  * with the vendor prefix stripped; otherwise, @default_id will be used.
 780  */
 781 void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
 782                        char *modalias, size_t len)
 783 {
 784         if (!acpi_of_modalias(adev, modalias, len))
 785                 strlcpy(modalias, default_id, len);
 786 }
 787 EXPORT_SYMBOL_GPL(acpi_set_modalias);
 788
 789 static bool __acpi_match_device_cls(const struct acpi_device_id *id,
 790                                     struct acpi_hardware_id *hwid)
 791 {
 792         int i, msk, byte_shift;
 793         char buf[3];
 794
 795         if (!id->cls)
 796                 return false;
 797
 798         /* Apply class-code bitmask, before checking each class-code byte */
 799         for (i = 1; i <= 3; i++) {
 800                 byte_shift = 8 * (3 - i);
 801                 msk = (id->cls_msk >> byte_shift) & 0xFF;
 802                 if (!msk)
 803                         continue;
 804
 805                 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
 806                 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
 807                         return false;
 808         }
 809         return true;
 810 }
 811
 812 static bool __acpi_match_device(struct acpi_device *device,
 813                                 const struct acpi_device_id *acpi_ids,
 814                                 const struct of_device_id *of_ids,
 815                                 const struct acpi_device_id **acpi_id,
 816                                 const struct of_device_id **of_id)
 817 {
 818         const struct acpi_device_id *id;
 819         struct acpi_hardware_id *hwid;
 820
 821         /*
 822          * If the device is not present, it is unnecessary to load device
 823          * driver for it.
 824          */
 825         if (!device || !device->status.present)
 826                 return false;
 827
 828         list_for_each_entry(hwid, &device->pnp.ids, list) {
 829                 /* First, check the ACPI/PNP IDs provided by the caller. */
 830                 if (acpi_ids) {
 831                         for (id = acpi_ids; id->id[0] || id->cls; id++) {
 832                                 if (id->id[0] && !strcmp((char *)id->id, hwid->id))
 833                                         goto out_acpi_match;
 834                                 if (id->cls && __acpi_match_device_cls(id, hwid))
 835                                         goto out_acpi_match;
 836                         }
 837                 }
 838
 839                 /*
 840                  * Next, check ACPI_DT_NAMESPACE_HID and try to match the
 841                  * "compatible" property if found.
 842                  */
 843                 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
 844                         return acpi_of_match_device(device, of_ids, of_id);
 845         }
 846         return false;
 847
 848 out_acpi_match:
 849         if (acpi_id)
 850                 *acpi_id = id;
 851         return true;
 852 }
 853
 854 /**
 855  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 856  * @ids: Array of struct acpi_device_id object to match against.
 857  * @dev: The device structure to match.
 858  *
 859  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 860  * object for that handle and use that object to match against a given list of
 861  * device IDs.
 862  *
 863  * Return a pointer to the first matching ID on success or %NULL on failure.
 864  */
 865 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 866                                                const struct device *dev)
 867 {
 868         const struct acpi_device_id *id = NULL;
 869
 870         __acpi_match_device(acpi_companion_match(dev), ids, NULL, &id, NULL);
 871         return id;
 872 }
 873 EXPORT_SYMBOL_GPL(acpi_match_device);
 874
 875 static const void *acpi_of_device_get_match_data(const struct device *dev)
 876 {
 877         struct acpi_device *adev = ACPI_COMPANION(dev);
 878         const struct of_device_id *match = NULL;
 879
 880         if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match))
 881                 return NULL;
 882
 883         return match->data;
 884 }
 885
 886 const void *acpi_device_get_match_data(const struct device *dev)
 887 {
 888         const struct acpi_device_id *match;
 889
 890         if (!dev->driver->acpi_match_table)
 891                 return acpi_of_device_get_match_data(dev);
 892
 893         match = acpi_match_device(dev->driver->acpi_match_table, dev);
 894         if (!match)
 895                 return NULL;
 896
 897         return (const void *)match->driver_data;
 898 }
 899 EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
 900
 901 int acpi_match_device_ids(struct acpi_device *device,
 902                           const struct acpi_device_id *ids)
 903 {
 904         return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
 905 }
 906 EXPORT_SYMBOL(acpi_match_device_ids);
 907
 908 bool acpi_driver_match_device(struct device *dev,
 909                               const struct device_driver *drv)
 910 {
 911         if (!drv->acpi_match_table)
 912                 return acpi_of_match_device(ACPI_COMPANION(dev),
 913                                             drv->of_match_table,
 914                                             NULL);
 915
 916         return __acpi_match_device(acpi_companion_match(dev),
 917                                    drv->acpi_match_table, drv->of_match_table,
 918                                    NULL, NULL);
 919 }
 920 EXPORT_SYMBOL_GPL(acpi_driver_match_device);
 921
 922 /* --------------------------------------------------------------------------
 923                               ACPI Driver Management
 924    -------------------------------------------------------------------------- */
 925
 926 /**
 927  * acpi_bus_register_driver - register a driver with the ACPI bus
 928  * @driver: driver being registered
 929  *
 930  * Registers a driver with the ACPI bus.  Searches the namespace for all
 931  * devices that match the driver's criteria and binds.  Returns zero for
 932  * success or a negative error status for failure.
 933  */
 934 int acpi_bus_register_driver(struct acpi_driver *driver)
 935 {
 936         int ret;
 937
 938         if (acpi_disabled)
 939                 return -ENODEV;
 940         driver->drv.name = driver->name;
 941         driver->drv.bus = &acpi_bus_type;
 942         driver->drv.owner = driver->owner;
 943
 944         ret = driver_register(&driver->drv);
 945         return ret;
 946 }
 947
 948 EXPORT_SYMBOL(acpi_bus_register_driver);
 949
 950 /**
 951  * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
 952  * @driver: driver to unregister
 953  *
 954  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 955  * devices that match the driver's criteria and unbinds.
 956  */
 957 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 958 {
 959         driver_unregister(&driver->drv);
 960 }
 961
 962 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 963
 964 /* --------------------------------------------------------------------------
 965                               ACPI Bus operations
 966    -------------------------------------------------------------------------- */
 967
 968 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 969 {
 970         struct acpi_device *acpi_dev = to_acpi_device(dev);
 971         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 972
 973         return acpi_dev->flags.match_driver
 974                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 975 }
 976
 977 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 978 {
 979         return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
 980 }
 981
 982 static int acpi_device_probe(struct device *dev)
 983 {
 984         struct acpi_device *acpi_dev = to_acpi_device(dev);
 985         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 986         int ret;
 987
 988         if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
 989                 return -EINVAL;
 990
 991         if (!acpi_drv->ops.add)
 992                 return -ENOSYS;
 993
 994         ret = acpi_drv->ops.add(acpi_dev);
 995         if (ret)
 996                 return ret;
 997
 998         acpi_dev->driver = acpi_drv;
 999
1000         pr_debug("Driver [%s] successfully bound to device [%s]\n",
1001                  acpi_drv->name, acpi_dev->pnp.bus_id);
1002
1003         if (acpi_drv->ops.notify) {
1004                 ret = acpi_device_install_notify_handler(acpi_dev);
1005                 if (ret) {
1006                         if (acpi_drv->ops.remove)
1007                                 acpi_drv->ops.remove(acpi_dev);
1008
1009                         acpi_dev->driver = NULL;
1010                         acpi_dev->driver_data = NULL;
1011                         return ret;
1012                 }
1013         }
1014
1015         pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name,
1016                  acpi_dev->pnp.bus_id);
1017
1018         get_device(dev);
1019         return 0;
1020 }
1021
1022 static void acpi_device_remove(struct device *dev)
1023 {
1024         struct acpi_device *acpi_dev = to_acpi_device(dev);
1025         struct acpi_driver *acpi_drv = acpi_dev->driver;
1026
1027         if (acpi_drv) {
1028                 if (acpi_drv->ops.notify)
1029                         acpi_device_remove_notify_handler(acpi_dev);
1030                 if (acpi_drv->ops.remove)
1031                         acpi_drv->ops.remove(acpi_dev);
1032         }
1033         acpi_dev->driver = NULL;
1034         acpi_dev->driver_data = NULL;
1035
1036         put_device(dev);
1037 }
1038
1039 struct bus_type acpi_bus_type = {
1040         .name           = "acpi",
1041         .match          = acpi_bus_match,
1042         .probe          = acpi_device_probe,
1043         .remove         = acpi_device_remove,
1044         .uevent         = acpi_device_uevent,
1045 };
1046 EXPORT_SYMBOL_GPL(acpi_bus_type);
1047
1048 /* --------------------------------------------------------------------------
1049                              Initialization/Cleanup
1050    -------------------------------------------------------------------------- */
1051
1052 static int __init acpi_bus_init_irq(void)
1053 {
1054         acpi_status status;
1055         char *message = NULL;
1056
1057
1058         /*
1059          * Let the system know what interrupt model we are using by
1060          * evaluating the \_PIC object, if exists.
1061          */
1062
1063         switch (acpi_irq_model) {
1064         case ACPI_IRQ_MODEL_PIC:
1065                 message = "PIC";
1066                 break;
1067         case ACPI_IRQ_MODEL_IOAPIC:
1068                 message = "IOAPIC";
1069                 break;
1070         case ACPI_IRQ_MODEL_IOSAPIC:
1071                 message = "IOSAPIC";
1072                 break;
1073         case ACPI_IRQ_MODEL_GIC:
1074                 message = "GIC";
1075                 break;
1076         case ACPI_IRQ_MODEL_PLATFORM:
1077                 message = "platform specific model";
1078                 break;
1079         default:
1080                 pr_info("Unknown interrupt routing model\n");
1081                 return -ENODEV;
1082         }
1083
1084         pr_info("Using %s for interrupt routing\n", message);
1085
1086         status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1087         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1088                 pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status));
1089                 return -ENODEV;
1090         }
1091
1092         return 0;
1093 }
1094
1095 /**
1096  * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1097  *
1098  * The ACPI tables are accessible after this, but the handling of events has not
1099  * been initialized and the global lock is not available yet, so AML should not
1100  * be executed at this point.
1101  *
1102  * Doing this before switching the EFI runtime services to virtual mode allows
1103  * the EfiBootServices memory to be freed slightly earlier on boot.
1104  */
1105 void __init acpi_early_init(void)
1106 {
1107         acpi_status status;
1108
1109         if (acpi_disabled)
1110                 return;
1111
1112         pr_info("Core revision %08x\n", ACPI_CA_VERSION);
1113
1114         /* enable workarounds, unless strict ACPI spec. compliance */
1115         if (!acpi_strict)
1116                 acpi_gbl_enable_interpreter_slack = TRUE;
1117
1118         acpi_permanent_mmap = true;
1119
1120 #ifdef CONFIG_X86
1121         /*
1122          * If the machine falls into the DMI check table,
1123          * DSDT will be copied to memory.
1124          * Note that calling dmi_check_system() here on other architectures
1125          * would not be OK because only x86 initializes dmi early enough.
1126          * Thankfully only x86 systems need such quirks for now.
1127          */
1128         dmi_check_system(dsdt_dmi_table);
1129 #endif
1130
1131         status = acpi_reallocate_root_table();
1132         if (ACPI_FAILURE(status)) {
1133                 pr_err("Unable to reallocate ACPI tables\n");
1134                 goto error0;
1135         }
1136
1137         status = acpi_initialize_subsystem();
1138         if (ACPI_FAILURE(status)) {
1139                 pr_err("Unable to initialize the ACPI Interpreter\n");
1140                 goto error0;
1141         }
1142
1143 #ifdef CONFIG_X86
1144         if (!acpi_ioapic) {
1145                 /* compatible (0) means level (3) */
1146                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1147                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1148                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1149                 }
1150                 /* Set PIC-mode SCI trigger type */
1151                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1152                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1153         } else {
1154                 /*
1155                  * now that acpi_gbl_FADT is initialized,
1156                  * update it with result from INT_SRC_OVR parsing
1157                  */
1158                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1159         }
1160 #endif
1161         return;
1162
1163  error0:
1164         disable_acpi();
1165 }
1166
1167 /**
1168  * acpi_subsystem_init - Finalize the early initialization of ACPI.
1169  *
1170  * Switch over the platform to the ACPI mode (if possible).
1171  *
1172  * Doing this too early is generally unsafe, but at the same time it needs to be
1173  * done before all things that really depend on ACPI.  The right spot appears to
1174  * be before finalizing the EFI initialization.
1175  */
1176 void __init acpi_subsystem_init(void)
1177 {
1178         acpi_status status;
1179
1180         if (acpi_disabled)
1181                 return;
1182
1183         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1184         if (ACPI_FAILURE(status)) {
1185                 pr_err("Unable to enable ACPI\n");
1186                 disable_acpi();
1187         } else {
1188                 /*
1189                  * If the system is using ACPI then we can be reasonably
1190                  * confident that any regulators are managed by the firmware
1191                  * so tell the regulator core it has everything it needs to
1192                  * know.
1193                  */
1194                 regulator_has_full_constraints();
1195         }
1196 }
1197
1198 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1199 {
1200         if (event == ACPI_TABLE_EVENT_LOAD)
1201                 acpi_scan_table_notify();
1202
1203         return acpi_sysfs_table_handler(event, table, context);
1204 }
1205
1206 static int __init acpi_bus_init(void)
1207 {
1208         int result;
1209         acpi_status status;
1210
1211         acpi_os_initialize1();
1212
1213         status = acpi_load_tables();
1214         if (ACPI_FAILURE(status)) {
1215                 pr_err("Unable to load the System Description Tables\n");
1216                 goto error1;
1217         }
1218
1219         /*
1220          * ACPI 2.0 requires the EC driver to be loaded and work before the EC
1221          * device is found in the namespace.
1222          *
1223          * This is accomplished by looking for the ECDT table and getting the EC
1224          * parameters out of that.
1225          *
1226          * Do that before calling acpi_initialize_objects() which may trigger EC
1227          * address space accesses.
1228          */
1229         acpi_ec_ecdt_probe();
1230
1231         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1232         if (ACPI_FAILURE(status)) {
1233                 pr_err("Unable to start the ACPI Interpreter\n");
1234                 goto error1;
1235         }
1236
1237         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1238         if (ACPI_FAILURE(status)) {
1239                 pr_err("Unable to initialize ACPI objects\n");
1240                 goto error1;
1241         }
1242
1243         /* Set capability bits for _OSC under processor scope */
1244         acpi_early_processor_osc();
1245
1246         /*
1247          * _OSC method may exist in module level code,
1248          * so it must be run after ACPI_FULL_INITIALIZATION
1249          */
1250         acpi_bus_osc_negotiate_platform_control();
1251         acpi_bus_osc_negotiate_usb_control();
1252
1253         /*
1254          * _PDC control method may load dynamic SSDT tables,
1255          * and we need to install the table handler before that.
1256          */
1257         status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1258
1259         acpi_sysfs_init();
1260
1261         acpi_early_processor_set_pdc();
1262
1263         /*
1264          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1265          * is necessary to enable it as early as possible.
1266          */
1267         acpi_ec_dsdt_probe();
1268
1269         pr_info("Interpreter enabled\n");
1270
1271         /* Initialize sleep structures */
1272         acpi_sleep_init();
1273
1274         /*
1275          * Get the system interrupt model and evaluate \_PIC.
1276          */
1277         result = acpi_bus_init_irq();
1278         if (result)
1279                 goto error1;
1280
1281         /*
1282          * Register the for all standard device notifications.
1283          */
1284         status =
1285             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1286                                         &acpi_bus_notify, NULL);
1287         if (ACPI_FAILURE(status)) {
1288                 pr_err("Unable to register for system notifications\n");
1289                 goto error1;
1290         }
1291
1292         /*
1293          * Create the top ACPI proc directory
1294          */
1295         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1296
1297         result = bus_register(&acpi_bus_type);
1298         if (!result)
1299                 return 0;
1300
1301         /* Mimic structured exception handling */
1302       error1:
1303         acpi_terminate();
1304         return -ENODEV;
1305 }
1306
1307 struct kobject *acpi_kobj;
1308 EXPORT_SYMBOL_GPL(acpi_kobj);
1309
1310 static int __init acpi_init(void)
1311 {
1312         int result;
1313
1314         if (acpi_disabled) {
1315                 pr_info("Interpreter disabled.\n");
1316                 return -ENODEV;
1317         }
1318
1319         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1320         if (!acpi_kobj)
1321                 pr_debug("%s: kset create error\n", __func__);
1322
1323         init_prmt();
1324         acpi_init_pcc();
1325         result = acpi_bus_init();
1326         if (result) {
1327                 kobject_put(acpi_kobj);
1328                 disable_acpi();
1329                 return result;
1330         }
1331
1332         pci_mmcfg_late_init();
1333         acpi_iort_init();
1334         acpi_scan_init();
1335         acpi_ec_init();
1336         acpi_debugfs_init();
1337         acpi_sleep_proc_init();
1338         acpi_wakeup_device_init();
1339         acpi_debugger_init();
1340         acpi_setup_sb_notify_handler();
1341         acpi_viot_init();
1342         return 0;
1343 }
1344
1345 subsys_initcall(acpi_init);