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1// SPDX-License-Identifier: GPL-2.0-or-later2/*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: " fmt9 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_X8626#include <asm/mpspec.h>27#include <linux/dmi.h>28#endif29#include <linux/acpi_viot.h>30#include <linux/pci.h>31#include <acpi/apei.h>32#include <linux/suspend.h>33#include <linux/prmt.h>34 35#include "internal.h"36 37struct acpi_device *acpi_root;38struct proc_dir_entry *acpi_root_dir;39EXPORT_SYMBOL(acpi_root_dir);40 41#ifdef CONFIG_X8642#ifdef CONFIG_ACPI_CUSTOM_DSDT43static inline int set_copy_dsdt(const struct dmi_system_id *id)44{45 return 0;46}47#else48static int set_copy_dsdt(const struct dmi_system_id *id)49{50 pr_notice("%s detected - force copy of DSDT to local memory\n", id->ident);51 acpi_gbl_copy_dsdt_locally = 1;52 return 0;53}54#endif55 56static const struct dmi_system_id dsdt_dmi_table[] __initconst = {57 /*58 * Invoke DSDT corruption work-around on all Toshiba Satellite.59 * https://bugzilla.kernel.org/show_bug.cgi?id=1467960 */61 {62 .callback = set_copy_dsdt,63 .ident = "TOSHIBA Satellite",64 .matches = {65 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),66 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),67 },68 },69 {}70};71#endif72 73/* --------------------------------------------------------------------------74 Device Management75 -------------------------------------------------------------------------- */76 77acpi_status acpi_bus_get_status_handle(acpi_handle handle,78 unsigned long long *sta)79{80 acpi_status status;81 82 status = acpi_evaluate_integer(handle, "_STA", NULL, sta);83 if (ACPI_SUCCESS(status))84 return AE_OK;85 86 if (status == AE_NOT_FOUND) {87 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |88 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;89 return AE_OK;90 }91 return status;92}93EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);94 95int acpi_bus_get_status(struct acpi_device *device)96{97 acpi_status status;98 unsigned long long sta;99 100 if (acpi_device_override_status(device, &sta)) {101 acpi_set_device_status(device, sta);102 return 0;103 }104 105 /* Battery devices must have their deps met before calling _STA */106 if (acpi_device_is_battery(device) && device->dep_unmet) {107 acpi_set_device_status(device, 0);108 return 0;109 }110 111 status = acpi_bus_get_status_handle(device->handle, &sta);112 if (ACPI_FAILURE(status))113 return -ENODEV;114 115 if (!device->status.present && device->status.enabled) {116 pr_info(FW_BUG "Device [%s] status [%08x]: not present and enabled\n",117 device->pnp.bus_id, (u32)sta);118 device->status.enabled = 0;119 /*120 * The status is clearly invalid, so clear the functional bit as121 * well to avoid attempting to use the device.122 */123 device->status.functional = 0;124 }125 126 acpi_set_device_status(device, sta);127 128 if (device->status.functional && !device->status.present) {129 pr_debug("Device [%s] status [%08x]: functional but not present\n",130 device->pnp.bus_id, (u32)sta);131 }132 133 pr_debug("Device [%s] status [%08x]\n", device->pnp.bus_id, (u32)sta);134 return 0;135}136EXPORT_SYMBOL(acpi_bus_get_status);137 138void acpi_bus_private_data_handler(acpi_handle handle,139 void *context)140{141 return;142}143EXPORT_SYMBOL(acpi_bus_private_data_handler);144 145int acpi_bus_attach_private_data(acpi_handle handle, void *data)146{147 acpi_status status;148 149 status = acpi_attach_data(handle,150 acpi_bus_private_data_handler, data);151 if (ACPI_FAILURE(status)) {152 acpi_handle_debug(handle, "Error attaching device data\n");153 return -ENODEV;154 }155 156 return 0;157}158EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);159 160int acpi_bus_get_private_data(acpi_handle handle, void **data)161{162 acpi_status status;163 164 if (!data)165 return -EINVAL;166 167 status = acpi_get_data(handle, acpi_bus_private_data_handler, data);168 if (ACPI_FAILURE(status)) {169 acpi_handle_debug(handle, "No context for object\n");170 return -ENODEV;171 }172 173 return 0;174}175EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);176 177void acpi_bus_detach_private_data(acpi_handle handle)178{179 acpi_detach_data(handle, acpi_bus_private_data_handler);180}181EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);182 183static void acpi_print_osc_error(acpi_handle handle,184 struct acpi_osc_context *context, char *error)185{186 int i;187 188 acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);189 190 pr_debug("_OSC request data:");191 for (i = 0; i < context->cap.length; i += sizeof(u32))192 pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));193 194 pr_debug("\n");195}196 197acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)198{199 acpi_status status;200 struct acpi_object_list input;201 union acpi_object in_params[4];202 union acpi_object *out_obj;203 guid_t guid;204 u32 errors;205 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};206 207 if (!context)208 return AE_ERROR;209 if (guid_parse(context->uuid_str, &guid))210 return AE_ERROR;211 context->ret.length = ACPI_ALLOCATE_BUFFER;212 context->ret.pointer = NULL;213 214 /* Setting up input parameters */215 input.count = 4;216 input.pointer = in_params;217 in_params[0].type = ACPI_TYPE_BUFFER;218 in_params[0].buffer.length = 16;219 in_params[0].buffer.pointer = (u8 *)&guid;220 in_params[1].type = ACPI_TYPE_INTEGER;221 in_params[1].integer.value = context->rev;222 in_params[2].type = ACPI_TYPE_INTEGER;223 in_params[2].integer.value = context->cap.length/sizeof(u32);224 in_params[3].type = ACPI_TYPE_BUFFER;225 in_params[3].buffer.length = context->cap.length;226 in_params[3].buffer.pointer = context->cap.pointer;227 228 status = acpi_evaluate_object(handle, "_OSC", &input, &output);229 if (ACPI_FAILURE(status))230 return status;231 232 if (!output.length)233 return AE_NULL_OBJECT;234 235 out_obj = output.pointer;236 if (out_obj->type != ACPI_TYPE_BUFFER237 || out_obj->buffer.length != context->cap.length) {238 acpi_print_osc_error(handle, context,239 "_OSC evaluation returned wrong type");240 status = AE_TYPE;241 goto out_kfree;242 }243 /* Need to ignore the bit0 in result code */244 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);245 if (errors) {246 if (errors & OSC_REQUEST_ERROR)247 acpi_print_osc_error(handle, context,248 "_OSC request failed");249 if (errors & OSC_INVALID_UUID_ERROR)250 acpi_print_osc_error(handle, context,251 "_OSC invalid UUID");252 if (errors & OSC_INVALID_REVISION_ERROR)253 acpi_print_osc_error(handle, context,254 "_OSC invalid revision");255 if (errors & OSC_CAPABILITIES_MASK_ERROR) {256 if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]257 & OSC_QUERY_ENABLE)258 goto out_success;259 status = AE_SUPPORT;260 goto out_kfree;261 }262 status = AE_ERROR;263 goto out_kfree;264 }265out_success:266 context->ret.length = out_obj->buffer.length;267 context->ret.pointer = kmemdup(out_obj->buffer.pointer,268 context->ret.length, GFP_KERNEL);269 if (!context->ret.pointer) {270 status = AE_NO_MEMORY;271 goto out_kfree;272 }273 status = AE_OK;274 275out_kfree:276 kfree(output.pointer);277 return status;278}279EXPORT_SYMBOL(acpi_run_osc);280 281bool osc_sb_apei_support_acked;282 283/*284 * ACPI 6.0 Section 8.4.4.2 Idle State Coordination285 * OSPM supports platform coordinated low power idle(LPI) states286 */287bool osc_pc_lpi_support_confirmed;288EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);289 290/*291 * ACPI 6.2 Section 6.2.11.2 'Platform-Wide OSPM Capabilities':292 * Starting with ACPI Specification 6.2, all _CPC registers can be in293 * PCC, System Memory, System IO, or Functional Fixed Hardware address294 * spaces. OSPM support for this more flexible register space scheme is295 * indicated by the “Flexible Address Space for CPPC Registers” _OSC bit.296 *297 * Otherwise (cf ACPI 6.1, s8.4.7.1.1.X), _CPC registers must be in:298 * - PCC or Functional Fixed Hardware address space if defined299 * - SystemMemory address space (NULL register) if not defined300 */301bool osc_cpc_flexible_adr_space_confirmed;302EXPORT_SYMBOL_GPL(osc_cpc_flexible_adr_space_confirmed);303 304/*305 * ACPI 6.4 Operating System Capabilities for USB.306 */307bool osc_sb_native_usb4_support_confirmed;308EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed);309 310bool osc_sb_cppc2_support_acked;311 312static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";313static void acpi_bus_osc_negotiate_platform_control(void)314{315 u32 capbuf[2], *capbuf_ret;316 struct acpi_osc_context context = {317 .uuid_str = sb_uuid_str,318 .rev = 1,319 .cap.length = 8,320 .cap.pointer = capbuf,321 };322 acpi_handle handle;323 324 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;325 capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */326 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))327 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;328 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))329 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;330 if (IS_ENABLED(CONFIG_ACPI_THERMAL))331 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_FAST_THERMAL_SAMPLING_SUPPORT;332 if (IS_ENABLED(CONFIG_ACPI_BATTERY))333 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_BATTERY_CHARGE_LIMITING_SUPPORT;334 335 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;336 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;337 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_OVER_16_PSTATES_SUPPORT;338 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GED_SUPPORT;339 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_IRQ_RESOURCE_SOURCE_SUPPORT;340 if (IS_ENABLED(CONFIG_ACPI_PRMT))341 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PRM_SUPPORT;342 if (IS_ENABLED(CONFIG_ACPI_FFH))343 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_FFH_OPR_SUPPORT;344 345#ifdef CONFIG_ARM64346 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;347#endif348#ifdef CONFIG_X86349 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;350#endif351 352#ifdef CONFIG_ACPI_CPPC_LIB353 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;354 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;355#endif356 357 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_FLEXIBLE_ADR_SPACE;358 359 if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))360 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;361 362 if (IS_ENABLED(CONFIG_USB4))363 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_NATIVE_USB4_SUPPORT;364 365 if (!ghes_disable)366 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;367 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))368 return;369 370 if (ACPI_FAILURE(acpi_run_osc(handle, &context)))371 return;372 373 capbuf_ret = context.ret.pointer;374 if (context.ret.length <= OSC_SUPPORT_DWORD) {375 kfree(context.ret.pointer);376 return;377 }378 379 /*380 * Now run _OSC again with query flag clear and with the caps381 * supported by both the OS and the platform.382 */383 capbuf[OSC_QUERY_DWORD] = 0;384 capbuf[OSC_SUPPORT_DWORD] = capbuf_ret[OSC_SUPPORT_DWORD];385 kfree(context.ret.pointer);386 387 if (ACPI_FAILURE(acpi_run_osc(handle, &context)))388 return;389 390 capbuf_ret = context.ret.pointer;391 if (context.ret.length > OSC_SUPPORT_DWORD) {392#ifdef CONFIG_ACPI_CPPC_LIB393 osc_sb_cppc2_support_acked = capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPCV2_SUPPORT;394#endif395 396 osc_sb_apei_support_acked =397 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;398 osc_pc_lpi_support_confirmed =399 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;400 osc_sb_native_usb4_support_confirmed =401 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT;402 osc_cpc_flexible_adr_space_confirmed =403 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPC_FLEXIBLE_ADR_SPACE;404 }405 406 kfree(context.ret.pointer);407}408 409/*410 * Native control of USB4 capabilities. If any of the tunneling bits is411 * set it means OS is in control and we use software based connection412 * manager.413 */414u32 osc_sb_native_usb4_control;415EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control);416 417static void acpi_bus_decode_usb_osc(const char *msg, u32 bits)418{419 pr_info("%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg,420 (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-',421 (bits & OSC_USB_DP_TUNNELING) ? '+' : '-',422 (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-',423 (bits & OSC_USB_XDOMAIN) ? '+' : '-');424}425 426static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A";427static void acpi_bus_osc_negotiate_usb_control(void)428{429 u32 capbuf[3], *capbuf_ret;430 struct acpi_osc_context context = {431 .uuid_str = sb_usb_uuid_str,432 .rev = 1,433 .cap.length = sizeof(capbuf),434 .cap.pointer = capbuf,435 };436 acpi_handle handle;437 acpi_status status;438 u32 control;439 440 if (!osc_sb_native_usb4_support_confirmed)441 return;442 443 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))444 return;445 446 control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING |447 OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN;448 449 /*450 * Run _OSC first with query bit set, trying to get control over451 * all tunneling. The platform can then clear out bits in the452 * control dword that it does not want to grant to the OS.453 */454 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;455 capbuf[OSC_SUPPORT_DWORD] = 0;456 capbuf[OSC_CONTROL_DWORD] = control;457 458 status = acpi_run_osc(handle, &context);459 if (ACPI_FAILURE(status))460 return;461 462 if (context.ret.length != sizeof(capbuf)) {463 pr_info("USB4 _OSC: returned invalid length buffer\n");464 goto out_free;465 }466 467 /*468 * Run _OSC again now with query bit clear and the control dword469 * matching what the platform granted (which may not have all470 * the control bits set).471 */472 capbuf_ret = context.ret.pointer;473 474 capbuf[OSC_QUERY_DWORD] = 0;475 capbuf[OSC_CONTROL_DWORD] = capbuf_ret[OSC_CONTROL_DWORD];476 477 kfree(context.ret.pointer);478 479 status = acpi_run_osc(handle, &context);480 if (ACPI_FAILURE(status))481 return;482 483 if (context.ret.length != sizeof(capbuf)) {484 pr_info("USB4 _OSC: returned invalid length buffer\n");485 goto out_free;486 }487 488 osc_sb_native_usb4_control =489 control & acpi_osc_ctx_get_pci_control(&context);490 491 acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control);492 acpi_bus_decode_usb_osc("USB4 _OSC: OS controls",493 osc_sb_native_usb4_control);494 495out_free:496 kfree(context.ret.pointer);497}498 499/* --------------------------------------------------------------------------500 Notification Handling501 -------------------------------------------------------------------------- */502 503/**504 * acpi_bus_notify - Global system-level (0x00-0x7F) notifications handler505 * @handle: Target ACPI object.506 * @type: Notification type.507 * @data: Ignored.508 *509 * This only handles notifications related to device hotplug.510 */511static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)512{513 struct acpi_device *adev;514 515 switch (type) {516 case ACPI_NOTIFY_BUS_CHECK:517 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");518 break;519 520 case ACPI_NOTIFY_DEVICE_CHECK:521 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");522 break;523 524 case ACPI_NOTIFY_DEVICE_WAKE:525 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");526 return;527 528 case ACPI_NOTIFY_EJECT_REQUEST:529 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");530 break;531 532 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:533 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");534 /* TBD: Exactly what does 'light' mean? */535 return;536 537 case ACPI_NOTIFY_FREQUENCY_MISMATCH:538 acpi_handle_err(handle, "Device cannot be configured due "539 "to a frequency mismatch\n");540 return;541 542 case ACPI_NOTIFY_BUS_MODE_MISMATCH:543 acpi_handle_err(handle, "Device cannot be configured due "544 "to a bus mode mismatch\n");545 return;546 547 case ACPI_NOTIFY_POWER_FAULT:548 acpi_handle_err(handle, "Device has suffered a power fault\n");549 return;550 551 default:552 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);553 return;554 }555 556 adev = acpi_get_acpi_dev(handle);557 558 if (adev && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))559 return;560 561 acpi_put_acpi_dev(adev);562 563 acpi_evaluate_ost(handle, type, ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);564}565 566static void acpi_notify_device(acpi_handle handle, u32 event, void *data)567{568 struct acpi_device *device = data;569 struct acpi_driver *acpi_drv = to_acpi_driver(device->dev.driver);570 571 acpi_drv->ops.notify(device, event);572}573 574static int acpi_device_install_notify_handler(struct acpi_device *device,575 struct acpi_driver *acpi_drv)576{577 u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ?578 ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY;579 acpi_status status;580 581 status = acpi_install_notify_handler(device->handle, type,582 acpi_notify_device, device);583 if (ACPI_FAILURE(status))584 return -EINVAL;585 586 return 0;587}588 589static void acpi_device_remove_notify_handler(struct acpi_device *device,590 struct acpi_driver *acpi_drv)591{592 u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ?593 ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY;594 595 acpi_remove_notify_handler(device->handle, type,596 acpi_notify_device);597 598 acpi_os_wait_events_complete();599}600 601int acpi_dev_install_notify_handler(struct acpi_device *adev,602 u32 handler_type,603 acpi_notify_handler handler, void *context)604{605 acpi_status status;606 607 status = acpi_install_notify_handler(adev->handle, handler_type,608 handler, context);609 if (ACPI_FAILURE(status))610 return -ENODEV;611 612 return 0;613}614EXPORT_SYMBOL_GPL(acpi_dev_install_notify_handler);615 616void acpi_dev_remove_notify_handler(struct acpi_device *adev,617 u32 handler_type,618 acpi_notify_handler handler)619{620 acpi_remove_notify_handler(adev->handle, handler_type, handler);621 acpi_os_wait_events_complete();622}623EXPORT_SYMBOL_GPL(acpi_dev_remove_notify_handler);624 625/* Handle events targeting \_SB device (at present only graceful shutdown) */626 627#define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81628#define ACPI_SB_INDICATE_INTERVAL 10000629 630static void sb_notify_work(struct work_struct *dummy)631{632 acpi_handle sb_handle;633 634 orderly_poweroff(true);635 636 /*637 * After initiating graceful shutdown, the ACPI spec requires OSPM638 * to evaluate _OST method once every 10seconds to indicate that639 * the shutdown is in progress640 */641 acpi_get_handle(NULL, "\\_SB", &sb_handle);642 while (1) {643 pr_info("Graceful shutdown in progress.\n");644 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,645 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);646 msleep(ACPI_SB_INDICATE_INTERVAL);647 }648}649 650static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)651{652 static DECLARE_WORK(acpi_sb_work, sb_notify_work);653 654 if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {655 if (!work_busy(&acpi_sb_work))656 schedule_work(&acpi_sb_work);657 } else {658 pr_warn("event %x is not supported by \\_SB device\n", event);659 }660}661 662static int __init acpi_setup_sb_notify_handler(void)663{664 acpi_handle sb_handle;665 666 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))667 return -ENXIO;668 669 if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,670 acpi_sb_notify, NULL)))671 return -EINVAL;672 673 return 0;674}675 676/* --------------------------------------------------------------------------677 Device Matching678 -------------------------------------------------------------------------- */679 680/**681 * acpi_get_first_physical_node - Get first physical node of an ACPI device682 * @adev: ACPI device in question683 *684 * Return: First physical node of ACPI device @adev685 */686struct device *acpi_get_first_physical_node(struct acpi_device *adev)687{688 struct mutex *physical_node_lock = &adev->physical_node_lock;689 struct device *phys_dev;690 691 mutex_lock(physical_node_lock);692 if (list_empty(&adev->physical_node_list)) {693 phys_dev = NULL;694 } else {695 const struct acpi_device_physical_node *node;696 697 node = list_first_entry(&adev->physical_node_list,698 struct acpi_device_physical_node, node);699 700 phys_dev = node->dev;701 }702 mutex_unlock(physical_node_lock);703 return phys_dev;704}705EXPORT_SYMBOL_GPL(acpi_get_first_physical_node);706 707static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,708 const struct device *dev)709{710 const struct device *phys_dev = acpi_get_first_physical_node(adev);711 712 return phys_dev && phys_dev == dev ? adev : NULL;713}714 715/**716 * acpi_device_is_first_physical_node - Is given dev first physical node717 * @adev: ACPI companion device718 * @dev: Physical device to check719 *720 * Function checks if given @dev is the first physical devices attached to721 * the ACPI companion device. This distinction is needed in some cases722 * where the same companion device is shared between many physical devices.723 *724 * Note that the caller have to provide valid @adev pointer.725 */726bool acpi_device_is_first_physical_node(struct acpi_device *adev,727 const struct device *dev)728{729 return !!acpi_primary_dev_companion(adev, dev);730}731 732/*733 * acpi_companion_match() - Can we match via ACPI companion device734 * @dev: Device in question735 *736 * Check if the given device has an ACPI companion and if that companion has737 * a valid list of PNP IDs, and if the device is the first (primary) physical738 * device associated with it. Return the companion pointer if that's the case739 * or NULL otherwise.740 *741 * If multiple physical devices are attached to a single ACPI companion, we need742 * to be careful. The usage scenario for this kind of relationship is that all743 * of the physical devices in question use resources provided by the ACPI744 * companion. A typical case is an MFD device where all the sub-devices share745 * the parent's ACPI companion. In such cases we can only allow the primary746 * (first) physical device to be matched with the help of the companion's PNP747 * IDs.748 *749 * Additional physical devices sharing the ACPI companion can still use750 * resources available from it but they will be matched normally using functions751 * provided by their bus types (and analogously for their modalias).752 */753const struct acpi_device *acpi_companion_match(const struct device *dev)754{755 struct acpi_device *adev;756 757 adev = ACPI_COMPANION(dev);758 if (!adev)759 return NULL;760 761 if (list_empty(&adev->pnp.ids))762 return NULL;763 764 return acpi_primary_dev_companion(adev, dev);765}766 767/**768 * acpi_of_match_device - Match device object using the "compatible" property.769 * @adev: ACPI device object to match.770 * @of_match_table: List of device IDs to match against.771 * @of_id: OF ID if matched772 *773 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of774 * identifiers and a _DSD object with the "compatible" property, use that775 * property to match against the given list of identifiers.776 */777static bool acpi_of_match_device(const struct acpi_device *adev,778 const struct of_device_id *of_match_table,779 const struct of_device_id **of_id)780{781 const union acpi_object *of_compatible, *obj;782 int i, nval;783 784 if (!adev)785 return false;786 787 of_compatible = adev->data.of_compatible;788 if (!of_match_table || !of_compatible)789 return false;790 791 if (of_compatible->type == ACPI_TYPE_PACKAGE) {792 nval = of_compatible->package.count;793 obj = of_compatible->package.elements;794 } else { /* Must be ACPI_TYPE_STRING. */795 nval = 1;796 obj = of_compatible;797 }798 /* Now we can look for the driver DT compatible strings */799 for (i = 0; i < nval; i++, obj++) {800 const struct of_device_id *id;801 802 for (id = of_match_table; id->compatible[0]; id++)803 if (!strcasecmp(obj->string.pointer, id->compatible)) {804 if (of_id)805 *of_id = id;806 return true;807 }808 }809 810 return false;811}812 813static bool acpi_of_modalias(struct acpi_device *adev,814 char *modalias, size_t len)815{816 const union acpi_object *of_compatible;817 const union acpi_object *obj;818 const char *str, *chr;819 820 of_compatible = adev->data.of_compatible;821 if (!of_compatible)822 return false;823 824 if (of_compatible->type == ACPI_TYPE_PACKAGE)825 obj = of_compatible->package.elements;826 else /* Must be ACPI_TYPE_STRING. */827 obj = of_compatible;828 829 str = obj->string.pointer;830 chr = strchr(str, ',');831 strscpy(modalias, chr ? chr + 1 : str, len);832 833 return true;834}835 836/**837 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID838 * @adev: ACPI device object to match839 * @default_id: ID string to use as default if no compatible string found840 * @modalias: Pointer to buffer that modalias value will be copied into841 * @len: Length of modalias buffer842 *843 * This is a counterpart of of_alias_from_compatible() for struct acpi_device844 * objects. If there is a compatible string for @adev, it will be copied to845 * @modalias with the vendor prefix stripped; otherwise, @default_id will be846 * used.847 */848void acpi_set_modalias(struct acpi_device *adev, const char *default_id,849 char *modalias, size_t len)850{851 if (!acpi_of_modalias(adev, modalias, len))852 strscpy(modalias, default_id, len);853}854EXPORT_SYMBOL_GPL(acpi_set_modalias);855 856static bool __acpi_match_device_cls(const struct acpi_device_id *id,857 struct acpi_hardware_id *hwid)858{859 int i, msk, byte_shift;860 char buf[3];861 862 if (!id->cls)863 return false;864 865 /* Apply class-code bitmask, before checking each class-code byte */866 for (i = 1; i <= 3; i++) {867 byte_shift = 8 * (3 - i);868 msk = (id->cls_msk >> byte_shift) & 0xFF;869 if (!msk)870 continue;871 872 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);873 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))874 return false;875 }876 return true;877}878 879static bool __acpi_match_device(const struct acpi_device *device,880 const struct acpi_device_id *acpi_ids,881 const struct of_device_id *of_ids,882 const struct acpi_device_id **acpi_id,883 const struct of_device_id **of_id)884{885 const struct acpi_device_id *id;886 struct acpi_hardware_id *hwid;887 888 /*889 * If the device is not present, it is unnecessary to load device890 * driver for it.891 */892 if (!device || !device->status.present)893 return false;894 895 list_for_each_entry(hwid, &device->pnp.ids, list) {896 /* First, check the ACPI/PNP IDs provided by the caller. */897 if (acpi_ids) {898 for (id = acpi_ids; id->id[0] || id->cls; id++) {899 if (id->id[0] && !strcmp((char *)id->id, hwid->id))900 goto out_acpi_match;901 if (id->cls && __acpi_match_device_cls(id, hwid))902 goto out_acpi_match;903 }904 }905 906 /*907 * Next, check ACPI_DT_NAMESPACE_HID and try to match the908 * "compatible" property if found.909 */910 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))911 return acpi_of_match_device(device, of_ids, of_id);912 }913 return false;914 915out_acpi_match:916 if (acpi_id)917 *acpi_id = id;918 return true;919}920 921/**922 * acpi_match_acpi_device - Match an ACPI device against a given list of ACPI IDs923 * @ids: Array of struct acpi_device_id objects to match against.924 * @adev: The ACPI device pointer to match.925 *926 * Match the ACPI device @adev against a given list of ACPI IDs @ids.927 *928 * Return:929 * a pointer to the first matching ACPI ID on success or %NULL on failure.930 */931const struct acpi_device_id *acpi_match_acpi_device(const struct acpi_device_id *ids,932 const struct acpi_device *adev)933{934 const struct acpi_device_id *id = NULL;935 936 __acpi_match_device(adev, ids, NULL, &id, NULL);937 return id;938}939EXPORT_SYMBOL_GPL(acpi_match_acpi_device);940 941/**942 * acpi_match_device - Match a struct device against a given list of ACPI IDs943 * @ids: Array of struct acpi_device_id object to match against.944 * @dev: The device structure to match.945 *946 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device947 * object for that handle and use that object to match against a given list of948 * device IDs.949 *950 * Return a pointer to the first matching ID on success or %NULL on failure.951 */952const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,953 const struct device *dev)954{955 return acpi_match_acpi_device(ids, acpi_companion_match(dev));956}957EXPORT_SYMBOL_GPL(acpi_match_device);958 959static const void *acpi_of_device_get_match_data(const struct device *dev)960{961 struct acpi_device *adev = ACPI_COMPANION(dev);962 const struct of_device_id *match = NULL;963 964 if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match))965 return NULL;966 967 return match->data;968}969 970const void *acpi_device_get_match_data(const struct device *dev)971{972 const struct acpi_device_id *acpi_ids = dev->driver->acpi_match_table;973 const struct acpi_device_id *match;974 975 if (!acpi_ids)976 return acpi_of_device_get_match_data(dev);977 978 match = acpi_match_device(acpi_ids, dev);979 if (!match)980 return NULL;981 982 return (const void *)match->driver_data;983}984EXPORT_SYMBOL_GPL(acpi_device_get_match_data);985 986int acpi_match_device_ids(struct acpi_device *device,987 const struct acpi_device_id *ids)988{989 return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;990}991EXPORT_SYMBOL(acpi_match_device_ids);992 993bool acpi_driver_match_device(struct device *dev,994 const struct device_driver *drv)995{996 const struct acpi_device_id *acpi_ids = drv->acpi_match_table;997 const struct of_device_id *of_ids = drv->of_match_table;998 999 if (!acpi_ids)1000 return acpi_of_match_device(ACPI_COMPANION(dev), of_ids, NULL);1001 1002 return __acpi_match_device(acpi_companion_match(dev), acpi_ids, of_ids, NULL, NULL);1003}1004EXPORT_SYMBOL_GPL(acpi_driver_match_device);1005 1006/* --------------------------------------------------------------------------1007 ACPI Driver Management1008 -------------------------------------------------------------------------- */1009 1010/**1011 * __acpi_bus_register_driver - register a driver with the ACPI bus1012 * @driver: driver being registered1013 * @owner: owning module/driver1014 *1015 * Registers a driver with the ACPI bus. Searches the namespace for all1016 * devices that match the driver's criteria and binds. Returns zero for1017 * success or a negative error status for failure.1018 */1019int __acpi_bus_register_driver(struct acpi_driver *driver, struct module *owner)1020{1021 if (acpi_disabled)1022 return -ENODEV;1023 driver->drv.name = driver->name;1024 driver->drv.bus = &acpi_bus_type;1025 driver->drv.owner = owner;1026 1027 return driver_register(&driver->drv);1028}1029 1030EXPORT_SYMBOL(__acpi_bus_register_driver);1031 1032/**1033 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus1034 * @driver: driver to unregister1035 *1036 * Unregisters a driver with the ACPI bus. Searches the namespace for all1037 * devices that match the driver's criteria and unbinds.1038 */1039void acpi_bus_unregister_driver(struct acpi_driver *driver)1040{1041 driver_unregister(&driver->drv);1042}1043 1044EXPORT_SYMBOL(acpi_bus_unregister_driver);1045 1046/* --------------------------------------------------------------------------1047 ACPI Bus operations1048 -------------------------------------------------------------------------- */1049 1050static int acpi_bus_match(struct device *dev, const struct device_driver *drv)1051{1052 struct acpi_device *acpi_dev = to_acpi_device(dev);1053 const struct acpi_driver *acpi_drv = to_acpi_driver(drv);1054 1055 return acpi_dev->flags.match_driver1056 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);1057}1058 1059static int acpi_device_uevent(const struct device *dev, struct kobj_uevent_env *env)1060{1061 return __acpi_device_uevent_modalias(to_acpi_device(dev), env);1062}1063 1064static int acpi_device_probe(struct device *dev)1065{1066 struct acpi_device *acpi_dev = to_acpi_device(dev);1067 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);1068 int ret;1069 1070 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))1071 return -EINVAL;1072 1073 if (!acpi_drv->ops.add)1074 return -ENOSYS;1075 1076 ret = acpi_drv->ops.add(acpi_dev);1077 if (ret) {1078 acpi_dev->driver_data = NULL;1079 return ret;1080 }1081 1082 pr_debug("Driver [%s] successfully bound to device [%s]\n",1083 acpi_drv->name, acpi_dev->pnp.bus_id);1084 1085 if (acpi_drv->ops.notify) {1086 ret = acpi_device_install_notify_handler(acpi_dev, acpi_drv);1087 if (ret) {1088 if (acpi_drv->ops.remove)1089 acpi_drv->ops.remove(acpi_dev);1090 1091 acpi_dev->driver_data = NULL;1092 return ret;1093 }1094 }1095 1096 pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name,1097 acpi_dev->pnp.bus_id);1098 1099 get_device(dev);1100 return 0;1101}1102 1103static void acpi_device_remove(struct device *dev)1104{1105 struct acpi_device *acpi_dev = to_acpi_device(dev);1106 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);1107 1108 if (acpi_drv->ops.notify)1109 acpi_device_remove_notify_handler(acpi_dev, acpi_drv);1110 1111 if (acpi_drv->ops.remove)1112 acpi_drv->ops.remove(acpi_dev);1113 1114 acpi_dev->driver_data = NULL;1115 1116 put_device(dev);1117}1118 1119const struct bus_type acpi_bus_type = {1120 .name = "acpi",1121 .match = acpi_bus_match,1122 .probe = acpi_device_probe,1123 .remove = acpi_device_remove,1124 .uevent = acpi_device_uevent,1125};1126 1127int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data)1128{1129 return bus_for_each_dev(&acpi_bus_type, NULL, data, fn);1130}1131EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev);1132 1133struct acpi_dev_walk_context {1134 int (*fn)(struct acpi_device *, void *);1135 void *data;1136};1137 1138static int acpi_dev_for_one_check(struct device *dev, void *context)1139{1140 struct acpi_dev_walk_context *adwc = context;1141 1142 if (dev->bus != &acpi_bus_type)1143 return 0;1144 1145 return adwc->fn(to_acpi_device(dev), adwc->data);1146}1147EXPORT_SYMBOL_GPL(acpi_dev_for_each_child);1148 1149int acpi_dev_for_each_child(struct acpi_device *adev,1150 int (*fn)(struct acpi_device *, void *), void *data)1151{1152 struct acpi_dev_walk_context adwc = {1153 .fn = fn,1154 .data = data,1155 };1156 1157 return device_for_each_child(&adev->dev, &adwc, acpi_dev_for_one_check);1158}1159 1160int acpi_dev_for_each_child_reverse(struct acpi_device *adev,1161 int (*fn)(struct acpi_device *, void *),1162 void *data)1163{1164 struct acpi_dev_walk_context adwc = {1165 .fn = fn,1166 .data = data,1167 };1168 1169 return device_for_each_child_reverse(&adev->dev, &adwc, acpi_dev_for_one_check);1170}1171 1172/* --------------------------------------------------------------------------1173 Initialization/Cleanup1174 -------------------------------------------------------------------------- */1175 1176static int __init acpi_bus_init_irq(void)1177{1178 acpi_status status;1179 char *message = NULL;1180 1181 1182 /*1183 * Let the system know what interrupt model we are using by1184 * evaluating the \_PIC object, if exists.1185 */1186 1187 switch (acpi_irq_model) {1188 case ACPI_IRQ_MODEL_PIC:1189 message = "PIC";1190 break;1191 case ACPI_IRQ_MODEL_IOAPIC:1192 message = "IOAPIC";1193 break;1194 case ACPI_IRQ_MODEL_IOSAPIC:1195 message = "IOSAPIC";1196 break;1197 case ACPI_IRQ_MODEL_GIC:1198 message = "GIC";1199 break;1200 case ACPI_IRQ_MODEL_PLATFORM:1201 message = "platform specific model";1202 break;1203 case ACPI_IRQ_MODEL_LPIC:1204 message = "LPIC";1205 break;1206 case ACPI_IRQ_MODEL_RINTC:1207 message = "RINTC";1208 break;1209 default:1210 pr_info("Unknown interrupt routing model\n");1211 return -ENODEV;1212 }1213 1214 pr_info("Using %s for interrupt routing\n", message);1215 1216 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);1217 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {1218 pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status));1219 return -ENODEV;1220 }1221 1222 return 0;1223}1224 1225/**1226 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.1227 *1228 * The ACPI tables are accessible after this, but the handling of events has not1229 * been initialized and the global lock is not available yet, so AML should not1230 * be executed at this point.1231 *1232 * Doing this before switching the EFI runtime services to virtual mode allows1233 * the EfiBootServices memory to be freed slightly earlier on boot.1234 */1235void __init acpi_early_init(void)1236{1237 acpi_status status;1238 1239 if (acpi_disabled)1240 return;1241 1242 pr_info("Core revision %08x\n", ACPI_CA_VERSION);1243 1244 /* enable workarounds, unless strict ACPI spec. compliance */1245 if (!acpi_strict)1246 acpi_gbl_enable_interpreter_slack = TRUE;1247 1248 acpi_permanent_mmap = true;1249 1250#ifdef CONFIG_X861251 /*1252 * If the machine falls into the DMI check table,1253 * DSDT will be copied to memory.1254 * Note that calling dmi_check_system() here on other architectures1255 * would not be OK because only x86 initializes dmi early enough.1256 * Thankfully only x86 systems need such quirks for now.1257 */1258 dmi_check_system(dsdt_dmi_table);1259#endif1260 1261 status = acpi_reallocate_root_table();1262 if (ACPI_FAILURE(status)) {1263 pr_err("Unable to reallocate ACPI tables\n");1264 goto error0;1265 }1266 1267 status = acpi_initialize_subsystem();1268 if (ACPI_FAILURE(status)) {1269 pr_err("Unable to initialize the ACPI Interpreter\n");1270 goto error0;1271 }1272 1273#ifdef CONFIG_X861274 if (!acpi_ioapic) {1275 /* compatible (0) means level (3) */1276 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {1277 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;1278 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;1279 }1280 /* Set PIC-mode SCI trigger type */1281 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,1282 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);1283 } else {1284 /*1285 * now that acpi_gbl_FADT is initialized,1286 * update it with result from INT_SRC_OVR parsing1287 */1288 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;1289 }1290#endif1291 return;1292 1293 error0:1294 disable_acpi();1295}1296 1297/**1298 * acpi_subsystem_init - Finalize the early initialization of ACPI.1299 *1300 * Switch over the platform to the ACPI mode (if possible).1301 *1302 * Doing this too early is generally unsafe, but at the same time it needs to be1303 * done before all things that really depend on ACPI. The right spot appears to1304 * be before finalizing the EFI initialization.1305 */1306void __init acpi_subsystem_init(void)1307{1308 acpi_status status;1309 1310 if (acpi_disabled)1311 return;1312 1313 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);1314 if (ACPI_FAILURE(status)) {1315 pr_err("Unable to enable ACPI\n");1316 disable_acpi();1317 } else {1318 /*1319 * If the system is using ACPI then we can be reasonably1320 * confident that any regulators are managed by the firmware1321 * so tell the regulator core it has everything it needs to1322 * know.1323 */1324 regulator_has_full_constraints();1325 }1326}1327 1328static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)1329{1330 if (event == ACPI_TABLE_EVENT_LOAD)1331 acpi_scan_table_notify();1332 1333 return acpi_sysfs_table_handler(event, table, context);1334}1335 1336static int __init acpi_bus_init(void)1337{1338 int result;1339 acpi_status status;1340 1341 acpi_os_initialize1();1342 1343 status = acpi_load_tables();1344 if (ACPI_FAILURE(status)) {1345 pr_err("Unable to load the System Description Tables\n");1346 goto error1;1347 }1348 1349 /*1350 * ACPI 2.0 requires the EC driver to be loaded and work before the EC1351 * device is found in the namespace.1352 *1353 * This is accomplished by looking for the ECDT table and getting the EC1354 * parameters out of that.1355 *1356 * Do that before calling acpi_initialize_objects() which may trigger EC1357 * address space accesses.1358 */1359 acpi_ec_ecdt_probe();1360 1361 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);1362 if (ACPI_FAILURE(status)) {1363 pr_err("Unable to start the ACPI Interpreter\n");1364 goto error1;1365 }1366 1367 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);1368 if (ACPI_FAILURE(status)) {1369 pr_err("Unable to initialize ACPI objects\n");1370 goto error1;1371 }1372 1373 /*1374 * _OSC method may exist in module level code,1375 * so it must be run after ACPI_FULL_INITIALIZATION1376 */1377 acpi_bus_osc_negotiate_platform_control();1378 acpi_bus_osc_negotiate_usb_control();1379 1380 /*1381 * _PDC control method may load dynamic SSDT tables,1382 * and we need to install the table handler before that.1383 */1384 status = acpi_install_table_handler(acpi_bus_table_handler, NULL);1385 1386 acpi_sysfs_init();1387 1388 acpi_early_processor_control_setup();1389 1390 /*1391 * Maybe EC region is required at bus_scan/acpi_get_devices. So it1392 * is necessary to enable it as early as possible.1393 */1394 acpi_ec_dsdt_probe();1395 1396 pr_info("Interpreter enabled\n");1397 1398 /* Initialize sleep structures */1399 acpi_sleep_init();1400 1401 /*1402 * Get the system interrupt model and evaluate \_PIC.1403 */1404 result = acpi_bus_init_irq();1405 if (result)1406 goto error1;1407 1408 /*1409 * Register the for all standard device notifications.1410 */1411 status =1412 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,1413 &acpi_bus_notify, NULL);1414 if (ACPI_FAILURE(status)) {1415 pr_err("Unable to register for system notifications\n");1416 goto error1;1417 }1418 1419 /*1420 * Create the top ACPI proc directory1421 */1422 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);1423 1424 result = bus_register(&acpi_bus_type);1425 if (!result)1426 return 0;1427 1428 /* Mimic structured exception handling */1429 error1:1430 acpi_terminate();1431 return -ENODEV;1432}1433 1434struct kobject *acpi_kobj;1435EXPORT_SYMBOL_GPL(acpi_kobj);1436 1437static int __init acpi_init(void)1438{1439 int result;1440 1441 if (acpi_disabled) {1442 pr_info("Interpreter disabled.\n");1443 return -ENODEV;1444 }1445 1446 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);1447 if (!acpi_kobj)1448 pr_debug("%s: kset create error\n", __func__);1449 1450 init_prmt();1451 acpi_init_pcc();1452 result = acpi_bus_init();1453 if (result) {1454 kobject_put(acpi_kobj);1455 disable_acpi();1456 return result;1457 }1458 acpi_init_ffh();1459 1460 pci_mmcfg_late_init();1461 acpi_viot_early_init();1462 acpi_hest_init();1463 acpi_ghes_init();1464 acpi_arm_init();1465 acpi_riscv_init();1466 acpi_scan_init();1467 acpi_ec_init();1468 acpi_debugfs_init();1469 acpi_sleep_proc_init();1470 acpi_wakeup_device_init();1471 acpi_debugger_init();1472 acpi_setup_sb_notify_handler();1473 acpi_viot_init();1474 return 0;1475}1476 1477subsys_initcall(acpi_init);1478