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         capbuf_ret = context.ret.pointer;
 336         if (context.ret.length <= OSC_SUPPORT_DWORD) {
 337                 kfree(context.ret.pointer);
 338                 return;
 339         }
 340
 341         /*
 342          * Now run _OSC again with query flag clear and with the caps
 343          * supported by both the OS and the platform.
 344          */
 345         capbuf[OSC_QUERY_DWORD] = 0;
 346         capbuf[OSC_SUPPORT_DWORD] = capbuf_ret[OSC_SUPPORT_DWORD];
 347         kfree(context.ret.pointer);
 348
 349         if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
 350                 return;
 351
 352         capbuf_ret = context.ret.pointer;
 353         if (context.ret.length > OSC_SUPPORT_DWORD) {
 354                 osc_sb_apei_support_acked =
 355                         capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
 356                 osc_pc_lpi_support_confirmed =
 357                         capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
 358                 osc_sb_native_usb4_support_confirmed =
 359                         capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT;
 360         }
 361
 362         kfree(context.ret.pointer);
 363 }
 364
 365 /*
 366  * Native control of USB4 capabilities. If any of the tunneling bits is
 367  * set it means OS is in control and we use software based connection
 368  * manager.
 369  */
 370 u32 osc_sb_native_usb4_control;
 371 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control);
 372
 373 static void acpi_bus_decode_usb_osc(const char *msg, u32 bits)
 374 {
 375         pr_info("%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg,
 376                (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-',
 377                (bits & OSC_USB_DP_TUNNELING) ? '+' : '-',
 378                (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-',
 379                (bits & OSC_USB_XDOMAIN) ? '+' : '-');
 380 }
 381
 382 static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A";
 383 static void acpi_bus_osc_negotiate_usb_control(void)
 384 {
 385         u32 capbuf[3];
 386         struct acpi_osc_context context = {
 387                 .uuid_str = sb_usb_uuid_str,
 388                 .rev = 1,
 389                 .cap.length = sizeof(capbuf),
 390                 .cap.pointer = capbuf,
 391         };
 392         acpi_handle handle;
 393         acpi_status status;
 394         u32 control;
 395
 396         if (!osc_sb_native_usb4_support_confirmed)
 397                 return;
 398
 399         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 400                 return;
 401
 402         control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING |
 403                   OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN;
 404
 405         capbuf[OSC_QUERY_DWORD] = 0;
 406         capbuf[OSC_SUPPORT_DWORD] = 0;
 407         capbuf[OSC_CONTROL_DWORD] = control;
 408
 409         status = acpi_run_osc(handle, &context);
 410         if (ACPI_FAILURE(status))
 411                 return;
 412
 413         if (context.ret.length != sizeof(capbuf)) {
 414                 pr_info("USB4 _OSC: returned invalid length buffer\n");
 415                 goto out_free;
 416         }
 417
 418         osc_sb_native_usb4_control =
 419                 control & ((u32 *)context.ret.pointer)[OSC_CONTROL_DWORD];
 420
 421         acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control);
 422         acpi_bus_decode_usb_osc("USB4 _OSC: OS controls",
 423                                 osc_sb_native_usb4_control);
 424
 425 out_free:
 426         kfree(context.ret.pointer);
 427 }
 428
 429 /* --------------------------------------------------------------------------
 430                              Notification Handling
 431    -------------------------------------------------------------------------- */
 432
 433 /**
 434  * acpi_bus_notify
 435  * ---------------
 436  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 437  */
 438 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 439 {
 440         struct acpi_device *adev;
 441         struct acpi_driver *driver;
 442         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 443         bool hotplug_event = false;
 444
 445         switch (type) {
 446         case ACPI_NOTIFY_BUS_CHECK:
 447                 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
 448                 hotplug_event = true;
 449                 break;
 450
 451         case ACPI_NOTIFY_DEVICE_CHECK:
 452                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
 453                 hotplug_event = true;
 454                 break;
 455
 456         case ACPI_NOTIFY_DEVICE_WAKE:
 457                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
 458                 break;
 459
 460         case ACPI_NOTIFY_EJECT_REQUEST:
 461                 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
 462                 hotplug_event = true;
 463                 break;
 464
 465         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 466                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
 467                 /* TBD: Exactly what does 'light' mean? */
 468                 break;
 469
 470         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 471                 acpi_handle_err(handle, "Device cannot be configured due "
 472                                 "to a frequency mismatch\n");
 473                 break;
 474
 475         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 476                 acpi_handle_err(handle, "Device cannot be configured due "
 477                                 "to a bus mode mismatch\n");
 478                 break;
 479
 480         case ACPI_NOTIFY_POWER_FAULT:
 481                 acpi_handle_err(handle, "Device has suffered a power fault\n");
 482                 break;
 483
 484         default:
 485                 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
 486                 break;
 487         }
 488
 489         adev = acpi_bus_get_acpi_device(handle);
 490         if (!adev)
 491                 goto err;
 492
 493         driver = adev->driver;
 494         if (driver && driver->ops.notify &&
 495             (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 496                 driver->ops.notify(adev, type);
 497
 498         if (!hotplug_event) {
 499                 acpi_bus_put_acpi_device(adev);
 500                 return;
 501         }
 502
 503         if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
 504                 return;
 505
 506         acpi_bus_put_acpi_device(adev);
 507
 508  err:
 509         acpi_evaluate_ost(handle, type, ost_code, NULL);
 510 }
 511
 512 static void acpi_notify_device(acpi_handle handle, u32 event, void *data)
 513 {
 514         struct acpi_device *device = data;
 515
 516         device->driver->ops.notify(device, event);
 517 }
 518
 519 static void acpi_notify_device_fixed(void *data)
 520 {
 521         struct acpi_device *device = data;
 522
 523         /* Fixed hardware devices have no handles */
 524         acpi_notify_device(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 525 }
 526
 527 static u32 acpi_device_fixed_event(void *data)
 528 {
 529         acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_notify_device_fixed, data);
 530         return ACPI_INTERRUPT_HANDLED;
 531 }
 532
 533 static int acpi_device_install_notify_handler(struct acpi_device *device)
 534 {
 535         acpi_status status;
 536
 537         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 538                 status =
 539                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 540                                                      acpi_device_fixed_event,
 541                                                      device);
 542         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 543                 status =
 544                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 545                                                      acpi_device_fixed_event,
 546                                                      device);
 547         else
 548                 status = acpi_install_notify_handler(device->handle,
 549                                                      ACPI_DEVICE_NOTIFY,
 550                                                      acpi_notify_device,
 551                                                      device);
 552
 553         if (ACPI_FAILURE(status))
 554                 return -EINVAL;
 555         return 0;
 556 }
 557
 558 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 559 {
 560         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 561                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 562                                                 acpi_device_fixed_event);
 563         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 564                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 565                                                 acpi_device_fixed_event);
 566         else
 567                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 568                                            acpi_notify_device);
 569 }
 570
 571 /* Handle events targeting \_SB device (at present only graceful shutdown) */
 572
 573 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
 574 #define ACPI_SB_INDICATE_INTERVAL       10000
 575
 576 static void sb_notify_work(struct work_struct *dummy)
 577 {
 578         acpi_handle sb_handle;
 579
 580         orderly_poweroff(true);
 581
 582         /*
 583          * After initiating graceful shutdown, the ACPI spec requires OSPM
 584          * to evaluate _OST method once every 10seconds to indicate that
 585          * the shutdown is in progress
 586          */
 587         acpi_get_handle(NULL, "\\_SB", &sb_handle);
 588         while (1) {
 589                 pr_info("Graceful shutdown in progress.\n");
 590                 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
 591                                 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
 592                 msleep(ACPI_SB_INDICATE_INTERVAL);
 593         }
 594 }
 595
 596 static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
 597 {
 598         static DECLARE_WORK(acpi_sb_work, sb_notify_work);
 599
 600         if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
 601                 if (!work_busy(&acpi_sb_work))
 602                         schedule_work(&acpi_sb_work);
 603         } else
 604                 pr_warn("event %x is not supported by \\_SB device\n", event);
 605 }
 606
 607 static int __init acpi_setup_sb_notify_handler(void)
 608 {
 609         acpi_handle sb_handle;
 610
 611         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
 612                 return -ENXIO;
 613
 614         if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
 615                                                 acpi_sb_notify, NULL)))
 616                 return -EINVAL;
 617
 618         return 0;
 619 }
 620
 621 /* --------------------------------------------------------------------------
 622                              Device Matching
 623    -------------------------------------------------------------------------- */
 624
 625 /**
 626  * acpi_get_first_physical_node - Get first physical node of an ACPI device
 627  * @adev:       ACPI device in question
 628  *
 629  * Return: First physical node of ACPI device @adev
 630  */
 631 struct device *acpi_get_first_physical_node(struct acpi_device *adev)
 632 {
 633         struct mutex *physical_node_lock = &adev->physical_node_lock;
 634         struct device *phys_dev;
 635
 636         mutex_lock(physical_node_lock);
 637         if (list_empty(&adev->physical_node_list)) {
 638                 phys_dev = NULL;
 639         } else {
 640                 const struct acpi_device_physical_node *node;
 641
 642                 node = list_first_entry(&adev->physical_node_list,
 643                                         struct acpi_device_physical_node, node);
 644
 645                 phys_dev = node->dev;
 646         }
 647         mutex_unlock(physical_node_lock);
 648         return phys_dev;
 649 }
 650 EXPORT_SYMBOL_GPL(acpi_get_first_physical_node);
 651
 652 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
 653                                                       const struct device *dev)
 654 {
 655         const struct device *phys_dev = acpi_get_first_physical_node(adev);
 656
 657         return phys_dev && phys_dev == dev ? adev : NULL;
 658 }
 659
 660 /**
 661  * acpi_device_is_first_physical_node - Is given dev first physical node
 662  * @adev: ACPI companion device
 663  * @dev: Physical device to check
 664  *
 665  * Function checks if given @dev is the first physical devices attached to
 666  * the ACPI companion device. This distinction is needed in some cases
 667  * where the same companion device is shared between many physical devices.
 668  *
 669  * Note that the caller have to provide valid @adev pointer.
 670  */
 671 bool acpi_device_is_first_physical_node(struct acpi_device *adev,
 672                                         const struct device *dev)
 673 {
 674         return !!acpi_primary_dev_companion(adev, dev);
 675 }
 676
 677 /*
 678  * acpi_companion_match() - Can we match via ACPI companion device
 679  * @dev: Device in question
 680  *
 681  * Check if the given device has an ACPI companion and if that companion has
 682  * a valid list of PNP IDs, and if the device is the first (primary) physical
 683  * device associated with it.  Return the companion pointer if that's the case
 684  * or NULL otherwise.
 685  *
 686  * If multiple physical devices are attached to a single ACPI companion, we need
 687  * to be careful.  The usage scenario for this kind of relationship is that all
 688  * of the physical devices in question use resources provided by the ACPI
 689  * companion.  A typical case is an MFD device where all the sub-devices share
 690  * the parent's ACPI companion.  In such cases we can only allow the primary
 691  * (first) physical device to be matched with the help of the companion's PNP
 692  * IDs.
 693  *
 694  * Additional physical devices sharing the ACPI companion can still use
 695  * resources available from it but they will be matched normally using functions
 696  * provided by their bus types (and analogously for their modalias).
 697  */
 698 struct acpi_device *acpi_companion_match(const struct device *dev)
 699 {
 700         struct acpi_device *adev;
 701
 702         adev = ACPI_COMPANION(dev);
 703         if (!adev)
 704                 return NULL;
 705
 706         if (list_empty(&adev->pnp.ids))
 707                 return NULL;
 708
 709         return acpi_primary_dev_companion(adev, dev);
 710 }
 711
 712 /**
 713  * acpi_of_match_device - Match device object using the "compatible" property.
 714  * @adev: ACPI device object to match.
 715  * @of_match_table: List of device IDs to match against.
 716  * @of_id: OF ID if matched
 717  *
 718  * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
 719  * identifiers and a _DSD object with the "compatible" property, use that
 720  * property to match against the given list of identifiers.
 721  */
 722 static bool acpi_of_match_device(struct acpi_device *adev,
 723                                  const struct of_device_id *of_match_table,
 724                                  const struct of_device_id **of_id)
 725 {
 726         const union acpi_object *of_compatible, *obj;
 727         int i, nval;
 728
 729         if (!adev)
 730                 return false;
 731
 732         of_compatible = adev->data.of_compatible;
 733         if (!of_match_table || !of_compatible)
 734                 return false;
 735
 736         if (of_compatible->type == ACPI_TYPE_PACKAGE) {
 737                 nval = of_compatible->package.count;
 738                 obj = of_compatible->package.elements;
 739         } else { /* Must be ACPI_TYPE_STRING. */
 740                 nval = 1;
 741                 obj = of_compatible;
 742         }
 743         /* Now we can look for the driver DT compatible strings */
 744         for (i = 0; i < nval; i++, obj++) {
 745                 const struct of_device_id *id;
 746
 747                 for (id = of_match_table; id->compatible[0]; id++)
 748                         if (!strcasecmp(obj->string.pointer, id->compatible)) {
 749                                 if (of_id)
 750                                         *of_id = id;
 751                                 return true;
 752                         }
 753         }
 754
 755         return false;
 756 }
 757
 758 static bool acpi_of_modalias(struct acpi_device *adev,
 759                              char *modalias, size_t len)
 760 {
 761         const union acpi_object *of_compatible;
 762         const union acpi_object *obj;
 763         const char *str, *chr;
 764
 765         of_compatible = adev->data.of_compatible;
 766         if (!of_compatible)
 767                 return false;
 768
 769         if (of_compatible->type == ACPI_TYPE_PACKAGE)
 770                 obj = of_compatible->package.elements;
 771         else /* Must be ACPI_TYPE_STRING. */
 772                 obj = of_compatible;
 773
 774         str = obj->string.pointer;
 775         chr = strchr(str, ',');
 776         strlcpy(modalias, chr ? chr + 1 : str, len);
 777
 778         return true;
 779 }
 780
 781 /**
 782  * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
 783  * @adev:       ACPI device object to match
 784  * @default_id: ID string to use as default if no compatible string found
 785  * @modalias:   Pointer to buffer that modalias value will be copied into
 786  * @len:        Length of modalias buffer
 787  *
 788  * This is a counterpart of of_modalias_node() for struct acpi_device objects.
 789  * If there is a compatible string for @adev, it will be copied to @modalias
 790  * with the vendor prefix stripped; otherwise, @default_id will be used.
 791  */
 792 void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
 793                        char *modalias, size_t len)
 794 {
 795         if (!acpi_of_modalias(adev, modalias, len))
 796                 strlcpy(modalias, default_id, len);
 797 }
 798 EXPORT_SYMBOL_GPL(acpi_set_modalias);
 799
 800 static bool __acpi_match_device_cls(const struct acpi_device_id *id,
 801                                     struct acpi_hardware_id *hwid)
 802 {
 803         int i, msk, byte_shift;
 804         char buf[3];
 805
 806         if (!id->cls)
 807                 return false;
 808
 809         /* Apply class-code bitmask, before checking each class-code byte */
 810         for (i = 1; i <= 3; i++) {
 811                 byte_shift = 8 * (3 - i);
 812                 msk = (id->cls_msk >> byte_shift) & 0xFF;
 813                 if (!msk)
 814                         continue;
 815
 816                 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
 817                 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
 818                         return false;
 819         }
 820         return true;
 821 }
 822
 823 static bool __acpi_match_device(struct acpi_device *device,
 824                                 const struct acpi_device_id *acpi_ids,
 825                                 const struct of_device_id *of_ids,
 826                                 const struct acpi_device_id **acpi_id,
 827                                 const struct of_device_id **of_id)
 828 {
 829         const struct acpi_device_id *id;
 830         struct acpi_hardware_id *hwid;
 831
 832         /*
 833          * If the device is not present, it is unnecessary to load device
 834          * driver for it.
 835          */
 836         if (!device || !device->status.present)
 837                 return false;
 838
 839         list_for_each_entry(hwid, &device->pnp.ids, list) {
 840                 /* First, check the ACPI/PNP IDs provided by the caller. */
 841                 if (acpi_ids) {
 842                         for (id = acpi_ids; id->id[0] || id->cls; id++) {
 843                                 if (id->id[0] && !strcmp((char *)id->id, hwid->id))
 844                                         goto out_acpi_match;
 845                                 if (id->cls && __acpi_match_device_cls(id, hwid))
 846                                         goto out_acpi_match;
 847                         }
 848                 }
 849
 850                 /*
 851                  * Next, check ACPI_DT_NAMESPACE_HID and try to match the
 852                  * "compatible" property if found.
 853                  */
 854                 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
 855                         return acpi_of_match_device(device, of_ids, of_id);
 856         }
 857         return false;
 858
 859 out_acpi_match:
 860         if (acpi_id)
 861                 *acpi_id = id;
 862         return true;
 863 }
 864
 865 /**
 866  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 867  * @ids: Array of struct acpi_device_id object to match against.
 868  * @dev: The device structure to match.
 869  *
 870  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 871  * object for that handle and use that object to match against a given list of
 872  * device IDs.
 873  *
 874  * Return a pointer to the first matching ID on success or %NULL on failure.
 875  */
 876 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 877                                                const struct device *dev)
 878 {
 879         const struct acpi_device_id *id = NULL;
 880
 881         __acpi_match_device(acpi_companion_match(dev), ids, NULL, &id, NULL);
 882         return id;
 883 }
 884 EXPORT_SYMBOL_GPL(acpi_match_device);
 885
 886 static const void *acpi_of_device_get_match_data(const struct device *dev)
 887 {
 888         struct acpi_device *adev = ACPI_COMPANION(dev);
 889         const struct of_device_id *match = NULL;
 890
 891         if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match))
 892                 return NULL;
 893
 894         return match->data;
 895 }
 896
 897 const void *acpi_device_get_match_data(const struct device *dev)
 898 {
 899         const struct acpi_device_id *match;
 900
 901         if (!dev->driver->acpi_match_table)
 902                 return acpi_of_device_get_match_data(dev);
 903
 904         match = acpi_match_device(dev->driver->acpi_match_table, dev);
 905         if (!match)
 906                 return NULL;
 907
 908         return (const void *)match->driver_data;
 909 }
 910 EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
 911
 912 int acpi_match_device_ids(struct acpi_device *device,
 913                           const struct acpi_device_id *ids)
 914 {
 915         return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
 916 }
 917 EXPORT_SYMBOL(acpi_match_device_ids);
 918
 919 bool acpi_driver_match_device(struct device *dev,
 920                               const struct device_driver *drv)
 921 {
 922         if (!drv->acpi_match_table)
 923                 return acpi_of_match_device(ACPI_COMPANION(dev),
 924                                             drv->of_match_table,
 925                                             NULL);
 926
 927         return __acpi_match_device(acpi_companion_match(dev),
 928                                    drv->acpi_match_table, drv->of_match_table,
 929                                    NULL, NULL);
 930 }
 931 EXPORT_SYMBOL_GPL(acpi_driver_match_device);
 932
 933 /* --------------------------------------------------------------------------
 934                               ACPI Driver Management
 935    -------------------------------------------------------------------------- */
 936
 937 /**
 938  * acpi_bus_register_driver - register a driver with the ACPI bus
 939  * @driver: driver being registered
 940  *
 941  * Registers a driver with the ACPI bus.  Searches the namespace for all
 942  * devices that match the driver's criteria and binds.  Returns zero for
 943  * success or a negative error status for failure.
 944  */
 945 int acpi_bus_register_driver(struct acpi_driver *driver)
 946 {
 947         int ret;
 948
 949         if (acpi_disabled)
 950                 return -ENODEV;
 951         driver->drv.name = driver->name;
 952         driver->drv.bus = &acpi_bus_type;
 953         driver->drv.owner = driver->owner;
 954
 955         ret = driver_register(&driver->drv);
 956         return ret;
 957 }
 958
 959 EXPORT_SYMBOL(acpi_bus_register_driver);
 960
 961 /**
 962  * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
 963  * @driver: driver to unregister
 964  *
 965  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 966  * devices that match the driver's criteria and unbinds.
 967  */
 968 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 969 {
 970         driver_unregister(&driver->drv);
 971 }
 972
 973 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 974
 975 /* --------------------------------------------------------------------------
 976                               ACPI Bus operations
 977    -------------------------------------------------------------------------- */
 978
 979 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 980 {
 981         struct acpi_device *acpi_dev = to_acpi_device(dev);
 982         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 983
 984         return acpi_dev->flags.match_driver
 985                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 986 }
 987
 988 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 989 {
 990         return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
 991 }
 992
 993 static int acpi_device_probe(struct device *dev)
 994 {
 995         struct acpi_device *acpi_dev = to_acpi_device(dev);
 996         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 997         int ret;
 998
 999         if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
1000                 return -EINVAL;
1001
1002         if (!acpi_drv->ops.add)
1003                 return -ENOSYS;
1004
1005         ret = acpi_drv->ops.add(acpi_dev);
1006         if (ret)
1007                 return ret;
1008
1009         acpi_dev->driver = acpi_drv;
1010
1011         pr_debug("Driver [%s] successfully bound to device [%s]\n",
1012                  acpi_drv->name, acpi_dev->pnp.bus_id);
1013
1014         if (acpi_drv->ops.notify) {
1015                 ret = acpi_device_install_notify_handler(acpi_dev);
1016                 if (ret) {
1017                         if (acpi_drv->ops.remove)
1018                                 acpi_drv->ops.remove(acpi_dev);
1019
1020                         acpi_dev->driver = NULL;
1021                         acpi_dev->driver_data = NULL;
1022                         return ret;
1023                 }
1024         }
1025
1026         pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name,
1027                  acpi_dev->pnp.bus_id);
1028
1029         get_device(dev);
1030         return 0;
1031 }
1032
1033 static void acpi_device_remove(struct device *dev)
1034 {
1035         struct acpi_device *acpi_dev = to_acpi_device(dev);
1036         struct acpi_driver *acpi_drv = acpi_dev->driver;
1037
1038         if (acpi_drv) {
1039                 if (acpi_drv->ops.notify)
1040                         acpi_device_remove_notify_handler(acpi_dev);
1041                 if (acpi_drv->ops.remove)
1042                         acpi_drv->ops.remove(acpi_dev);
1043         }
1044         acpi_dev->driver = NULL;
1045         acpi_dev->driver_data = NULL;
1046
1047         put_device(dev);
1048 }
1049
1050 struct bus_type acpi_bus_type = {
1051         .name           = "acpi",
1052         .match          = acpi_bus_match,
1053         .probe          = acpi_device_probe,
1054         .remove         = acpi_device_remove,
1055         .uevent         = acpi_device_uevent,
1056 };
1057
1058 /* --------------------------------------------------------------------------
1059                              Initialization/Cleanup
1060    -------------------------------------------------------------------------- */
1061
1062 static int __init acpi_bus_init_irq(void)
1063 {
1064         acpi_status status;
1065         char *message = NULL;
1066
1067
1068         /*
1069          * Let the system know what interrupt model we are using by
1070          * evaluating the \_PIC object, if exists.
1071          */
1072
1073         switch (acpi_irq_model) {
1074         case ACPI_IRQ_MODEL_PIC:
1075                 message = "PIC";
1076                 break;
1077         case ACPI_IRQ_MODEL_IOAPIC:
1078                 message = "IOAPIC";
1079                 break;
1080         case ACPI_IRQ_MODEL_IOSAPIC:
1081                 message = "IOSAPIC";
1082                 break;
1083         case ACPI_IRQ_MODEL_GIC:
1084                 message = "GIC";
1085                 break;
1086         case ACPI_IRQ_MODEL_PLATFORM:
1087                 message = "platform specific model";
1088                 break;
1089         default:
1090                 pr_info("Unknown interrupt routing model\n");
1091                 return -ENODEV;
1092         }
1093
1094         pr_info("Using %s for interrupt routing\n", message);
1095
1096         status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1097         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1098                 pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status));
1099                 return -ENODEV;
1100         }
1101
1102         return 0;
1103 }
1104
1105 /**
1106  * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1107  *
1108  * The ACPI tables are accessible after this, but the handling of events has not
1109  * been initialized and the global lock is not available yet, so AML should not
1110  * be executed at this point.
1111  *
1112  * Doing this before switching the EFI runtime services to virtual mode allows
1113  * the EfiBootServices memory to be freed slightly earlier on boot.
1114  */
1115 void __init acpi_early_init(void)
1116 {
1117         acpi_status status;
1118
1119         if (acpi_disabled)
1120                 return;
1121
1122         pr_info("Core revision %08x\n", ACPI_CA_VERSION);
1123
1124         /* enable workarounds, unless strict ACPI spec. compliance */
1125         if (!acpi_strict)
1126                 acpi_gbl_enable_interpreter_slack = TRUE;
1127
1128         acpi_permanent_mmap = true;
1129
1130 #ifdef CONFIG_X86
1131         /*
1132          * If the machine falls into the DMI check table,
1133          * DSDT will be copied to memory.
1134          * Note that calling dmi_check_system() here on other architectures
1135          * would not be OK because only x86 initializes dmi early enough.
1136          * Thankfully only x86 systems need such quirks for now.
1137          */
1138         dmi_check_system(dsdt_dmi_table);
1139 #endif
1140
1141         status = acpi_reallocate_root_table();
1142         if (ACPI_FAILURE(status)) {
1143                 pr_err("Unable to reallocate ACPI tables\n");
1144                 goto error0;
1145         }
1146
1147         status = acpi_initialize_subsystem();
1148         if (ACPI_FAILURE(status)) {
1149                 pr_err("Unable to initialize the ACPI Interpreter\n");
1150                 goto error0;
1151         }
1152
1153 #ifdef CONFIG_X86
1154         if (!acpi_ioapic) {
1155                 /* compatible (0) means level (3) */
1156                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1157                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1158                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1159                 }
1160                 /* Set PIC-mode SCI trigger type */
1161                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1162                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1163         } else {
1164                 /*
1165                  * now that acpi_gbl_FADT is initialized,
1166                  * update it with result from INT_SRC_OVR parsing
1167                  */
1168                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1169         }
1170 #endif
1171         return;
1172
1173  error0:
1174         disable_acpi();
1175 }
1176
1177 /**
1178  * acpi_subsystem_init - Finalize the early initialization of ACPI.
1179  *
1180  * Switch over the platform to the ACPI mode (if possible).
1181  *
1182  * Doing this too early is generally unsafe, but at the same time it needs to be
1183  * done before all things that really depend on ACPI.  The right spot appears to
1184  * be before finalizing the EFI initialization.
1185  */
1186 void __init acpi_subsystem_init(void)
1187 {
1188         acpi_status status;
1189
1190         if (acpi_disabled)
1191                 return;
1192
1193         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1194         if (ACPI_FAILURE(status)) {
1195                 pr_err("Unable to enable ACPI\n");
1196                 disable_acpi();
1197         } else {
1198                 /*
1199                  * If the system is using ACPI then we can be reasonably
1200                  * confident that any regulators are managed by the firmware
1201                  * so tell the regulator core it has everything it needs to
1202                  * know.
1203                  */
1204                 regulator_has_full_constraints();
1205         }
1206 }
1207
1208 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1209 {
1210         if (event == ACPI_TABLE_EVENT_LOAD)
1211                 acpi_scan_table_notify();
1212
1213         return acpi_sysfs_table_handler(event, table, context);
1214 }
1215
1216 static int __init acpi_bus_init(void)
1217 {
1218         int result;
1219         acpi_status status;
1220
1221         acpi_os_initialize1();
1222
1223         status = acpi_load_tables();
1224         if (ACPI_FAILURE(status)) {
1225                 pr_err("Unable to load the System Description Tables\n");
1226                 goto error1;
1227         }
1228
1229         /*
1230          * ACPI 2.0 requires the EC driver to be loaded and work before the EC
1231          * device is found in the namespace.
1232          *
1233          * This is accomplished by looking for the ECDT table and getting the EC
1234          * parameters out of that.
1235          *
1236          * Do that before calling acpi_initialize_objects() which may trigger EC
1237          * address space accesses.
1238          */
1239         acpi_ec_ecdt_probe();
1240
1241         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1242         if (ACPI_FAILURE(status)) {
1243                 pr_err("Unable to start the ACPI Interpreter\n");
1244                 goto error1;
1245         }
1246
1247         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1248         if (ACPI_FAILURE(status)) {
1249                 pr_err("Unable to initialize ACPI objects\n");
1250                 goto error1;
1251         }
1252
1253         /* Set capability bits for _OSC under processor scope */
1254         acpi_early_processor_osc();
1255
1256         /*
1257          * _OSC method may exist in module level code,
1258          * so it must be run after ACPI_FULL_INITIALIZATION
1259          */
1260         acpi_bus_osc_negotiate_platform_control();
1261         acpi_bus_osc_negotiate_usb_control();
1262
1263         /*
1264          * _PDC control method may load dynamic SSDT tables,
1265          * and we need to install the table handler before that.
1266          */
1267         status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1268
1269         acpi_sysfs_init();
1270
1271         acpi_early_processor_set_pdc();
1272
1273         /*
1274          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1275          * is necessary to enable it as early as possible.
1276          */
1277         acpi_ec_dsdt_probe();
1278
1279         pr_info("Interpreter enabled\n");
1280
1281         /* Initialize sleep structures */
1282         acpi_sleep_init();
1283
1284         /*
1285          * Get the system interrupt model and evaluate \_PIC.
1286          */
1287         result = acpi_bus_init_irq();
1288         if (result)
1289                 goto error1;
1290
1291         /*
1292          * Register the for all standard device notifications.
1293          */
1294         status =
1295             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1296                                         &acpi_bus_notify, NULL);
1297         if (ACPI_FAILURE(status)) {
1298                 pr_err("Unable to register for system notifications\n");
1299                 goto error1;
1300         }
1301
1302         /*
1303          * Create the top ACPI proc directory
1304          */
1305         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1306
1307         result = bus_register(&acpi_bus_type);
1308         if (!result)
1309                 return 0;
1310
1311         /* Mimic structured exception handling */
1312       error1:
1313         acpi_terminate();
1314         return -ENODEV;
1315 }
1316
1317 struct kobject *acpi_kobj;
1318 EXPORT_SYMBOL_GPL(acpi_kobj);
1319
1320 static int __init acpi_init(void)
1321 {
1322         int result;
1323
1324         if (acpi_disabled) {
1325                 pr_info("Interpreter disabled.\n");
1326                 return -ENODEV;
1327         }
1328
1329         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1330         if (!acpi_kobj)
1331                 pr_debug("%s: kset create error\n", __func__);
1332
1333         init_prmt();
1334         result = acpi_bus_init();
1335         if (result) {
1336                 kobject_put(acpi_kobj);
1337                 disable_acpi();
1338                 return result;
1339         }
1340
1341         pci_mmcfg_late_init();
1342         acpi_iort_init();
1343         acpi_scan_init();
1344         acpi_ec_init();
1345         acpi_debugfs_init();
1346         acpi_sleep_proc_init();
1347         acpi_wakeup_device_init();
1348         acpi_debugger_init();
1349         acpi_setup_sb_notify_handler();
1350         acpi_viot_init();
1351         return 0;
1352 }
1353
1354 subsys_initcall(acpi_init);