1 // SPDX-License-Identifier: GPL-2.0-only
3 * scan.c - support for transforming the ACPI namespace into individual objects
6 #define pr_fmt(fmt) "ACPI: " fmt
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/slab.h>
11 #include <linux/kernel.h>
12 #include <linux/acpi.h>
13 #include <linux/acpi_iort.h>
14 #include <linux/acpi_viot.h>
15 #include <linux/iommu.h>
16 #include <linux/signal.h>
17 #include <linux/kthread.h>
18 #include <linux/dmi.h>
19 #include <linux/dma-map-ops.h>
20 #include <linux/platform_data/x86/apple.h>
21 #include <linux/pgtable.h>
22 #include <linux/crc32.h>
23 #include <linux/dma-direct.h>
28 #define ACPI_BUS_CLASS "system_bus"
29 #define ACPI_BUS_HID "LNXSYBUS"
30 #define ACPI_BUS_DEVICE_NAME "System Bus"
32 #define INVALID_ACPI_HANDLE ((acpi_handle)ZERO_PAGE(0))
34 static const char *dummy_hid = "device";
36 static LIST_HEAD(acpi_dep_list);
37 static DEFINE_MUTEX(acpi_dep_list_lock);
38 LIST_HEAD(acpi_bus_id_list);
39 static DEFINE_MUTEX(acpi_scan_lock);
40 static LIST_HEAD(acpi_scan_handlers_list);
41 DEFINE_MUTEX(acpi_device_lock);
42 LIST_HEAD(acpi_wakeup_device_list);
43 static DEFINE_MUTEX(acpi_hp_context_lock);
46 * The UART device described by the SPCR table is the only object which needs
47 * special-casing. Everything else is covered by ACPI namespace paths in STAO
50 static u64 spcr_uart_addr;
52 void acpi_scan_lock_acquire(void)
54 mutex_lock(&acpi_scan_lock);
56 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
58 void acpi_scan_lock_release(void)
60 mutex_unlock(&acpi_scan_lock);
62 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
64 void acpi_lock_hp_context(void)
66 mutex_lock(&acpi_hp_context_lock);
69 void acpi_unlock_hp_context(void)
71 mutex_unlock(&acpi_hp_context_lock);
74 void acpi_initialize_hp_context(struct acpi_device *adev,
75 struct acpi_hotplug_context *hp,
76 int (*notify)(struct acpi_device *, u32),
77 void (*uevent)(struct acpi_device *, u32))
79 acpi_lock_hp_context();
82 acpi_set_hp_context(adev, hp);
83 acpi_unlock_hp_context();
85 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
87 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
92 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
96 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
97 const char *hotplug_profile_name)
101 error = acpi_scan_add_handler(handler);
105 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
109 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
111 struct acpi_device_physical_node *pn;
113 char *envp[] = { "EVENT=offline", NULL };
116 * acpi_container_offline() calls this for all of the container's
117 * children under the container's physical_node_lock lock.
119 mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
121 list_for_each_entry(pn, &adev->physical_node_list, node)
122 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
124 kobject_uevent_env(&pn->dev->kobj, KOBJ_CHANGE, envp);
130 mutex_unlock(&adev->physical_node_lock);
134 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
137 struct acpi_device *device = acpi_fetch_acpi_dev(handle);
138 struct acpi_device_physical_node *pn;
139 bool second_pass = (bool)data;
140 acpi_status status = AE_OK;
145 if (device->handler && !device->handler->hotplug.enabled) {
146 *ret_p = &device->dev;
150 mutex_lock(&device->physical_node_lock);
152 list_for_each_entry(pn, &device->physical_node_list, node) {
156 /* Skip devices offlined by the first pass. */
160 pn->put_online = false;
162 ret = device_offline(pn->dev);
164 pn->put_online = !ret;
174 mutex_unlock(&device->physical_node_lock);
179 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
182 struct acpi_device *device = acpi_fetch_acpi_dev(handle);
183 struct acpi_device_physical_node *pn;
188 mutex_lock(&device->physical_node_lock);
190 list_for_each_entry(pn, &device->physical_node_list, node)
191 if (pn->put_online) {
192 device_online(pn->dev);
193 pn->put_online = false;
196 mutex_unlock(&device->physical_node_lock);
201 static int acpi_scan_try_to_offline(struct acpi_device *device)
203 acpi_handle handle = device->handle;
204 struct device *errdev = NULL;
208 * Carry out two passes here and ignore errors in the first pass,
209 * because if the devices in question are memory blocks and
210 * CONFIG_MEMCG is set, one of the blocks may hold data structures
211 * that the other blocks depend on, but it is not known in advance which
214 * If the first pass is successful, the second one isn't needed, though.
216 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
217 NULL, acpi_bus_offline, (void *)false,
219 if (status == AE_SUPPORT) {
220 dev_warn(errdev, "Offline disabled.\n");
221 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
222 acpi_bus_online, NULL, NULL, NULL);
225 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
228 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
229 NULL, acpi_bus_offline, (void *)true,
232 acpi_bus_offline(handle, 0, (void *)true,
236 dev_warn(errdev, "Offline failed.\n");
237 acpi_bus_online(handle, 0, NULL, NULL);
238 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
239 ACPI_UINT32_MAX, acpi_bus_online,
247 static int acpi_scan_check_and_detach(struct acpi_device *adev, void *check)
249 struct acpi_scan_handler *handler = adev->handler;
251 acpi_dev_for_each_child_reverse(adev, acpi_scan_check_and_detach, check);
254 acpi_bus_get_status(adev);
256 * Skip devices that are still there and take the enabled
259 if (acpi_device_is_enabled(adev))
262 /* Skip device that have not been enumerated. */
263 if (!acpi_device_enumerated(adev)) {
264 dev_dbg(&adev->dev, "Still not enumerated\n");
269 adev->flags.match_driver = false;
272 handler->detach(adev);
274 adev->handler = NULL;
276 device_release_driver(&adev->dev);
279 * Most likely, the device is going away, so put it into D3cold before
282 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
283 adev->flags.initialized = false;
284 acpi_device_clear_enumerated(adev);
289 static void acpi_scan_check_subtree(struct acpi_device *adev)
291 acpi_scan_check_and_detach(adev, (void *)true);
294 static int acpi_scan_hot_remove(struct acpi_device *device)
296 acpi_handle handle = device->handle;
297 unsigned long long sta;
300 if (device->handler && device->handler->hotplug.demand_offline) {
301 if (!acpi_scan_is_offline(device, true))
304 int error = acpi_scan_try_to_offline(device);
309 acpi_handle_debug(handle, "Ejecting\n");
311 acpi_bus_trim(device);
313 acpi_evaluate_lck(handle, 0);
317 status = acpi_evaluate_ej0(handle);
318 if (status == AE_NOT_FOUND)
320 else if (ACPI_FAILURE(status))
324 * Verify if eject was indeed successful. If not, log an error
325 * message. No need to call _OST since _EJ0 call was made OK.
327 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
328 if (ACPI_FAILURE(status)) {
329 acpi_handle_warn(handle,
330 "Status check after eject failed (0x%x)\n", status);
331 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
332 acpi_handle_warn(handle,
333 "Eject incomplete - status 0x%llx\n", sta);
339 static int acpi_scan_rescan_bus(struct acpi_device *adev)
341 struct acpi_scan_handler *handler = adev->handler;
344 if (handler && handler->hotplug.scan_dependent)
345 ret = handler->hotplug.scan_dependent(adev);
347 ret = acpi_bus_scan(adev->handle);
350 dev_info(&adev->dev, "Namespace scan failure\n");
355 static int acpi_scan_device_check(struct acpi_device *adev)
357 struct acpi_device *parent;
359 acpi_scan_check_subtree(adev);
361 if (!acpi_device_is_present(adev))
365 * This function is only called for device objects for which matching
366 * scan handlers exist. The only situation in which the scan handler
367 * is not attached to this device object yet is when the device has
368 * just appeared (either it wasn't present at all before or it was
369 * removed and then added again).
372 dev_dbg(&adev->dev, "Already enumerated\n");
376 parent = acpi_dev_parent(adev);
380 return acpi_scan_rescan_bus(parent);
383 static int acpi_scan_bus_check(struct acpi_device *adev)
385 acpi_scan_check_subtree(adev);
387 return acpi_scan_rescan_bus(adev);
390 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
393 case ACPI_NOTIFY_BUS_CHECK:
394 return acpi_scan_bus_check(adev);
395 case ACPI_NOTIFY_DEVICE_CHECK:
396 return acpi_scan_device_check(adev);
397 case ACPI_NOTIFY_EJECT_REQUEST:
398 case ACPI_OST_EC_OSPM_EJECT:
399 if (adev->handler && !adev->handler->hotplug.enabled) {
400 dev_info(&adev->dev, "Eject disabled\n");
403 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
404 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
405 return acpi_scan_hot_remove(adev);
410 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
412 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
415 lock_device_hotplug();
416 mutex_lock(&acpi_scan_lock);
419 * The device object's ACPI handle cannot become invalid as long as we
420 * are holding acpi_scan_lock, but it might have become invalid before
421 * that lock was acquired.
423 if (adev->handle == INVALID_ACPI_HANDLE)
426 if (adev->flags.is_dock_station) {
427 error = dock_notify(adev, src);
428 } else if (adev->flags.hotplug_notify) {
429 error = acpi_generic_hotplug_event(adev, src);
431 int (*notify)(struct acpi_device *, u32);
433 acpi_lock_hp_context();
434 notify = adev->hp ? adev->hp->notify : NULL;
435 acpi_unlock_hp_context();
437 * There may be additional notify handlers for device objects
438 * without the .event() callback, so ignore them here.
441 error = notify(adev, src);
447 ost_code = ACPI_OST_SC_SUCCESS;
450 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
453 ost_code = ACPI_OST_SC_DEVICE_BUSY;
456 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
461 acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
464 acpi_put_acpi_dev(adev);
465 mutex_unlock(&acpi_scan_lock);
466 unlock_device_hotplug();
469 static void acpi_free_power_resources_lists(struct acpi_device *device)
473 if (device->wakeup.flags.valid)
474 acpi_power_resources_list_free(&device->wakeup.resources);
476 if (!device->power.flags.power_resources)
479 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
480 struct acpi_device_power_state *ps = &device->power.states[i];
481 acpi_power_resources_list_free(&ps->resources);
485 static void acpi_device_release(struct device *dev)
487 struct acpi_device *acpi_dev = to_acpi_device(dev);
489 acpi_free_properties(acpi_dev);
490 acpi_free_pnp_ids(&acpi_dev->pnp);
491 acpi_free_power_resources_lists(acpi_dev);
495 static void acpi_device_del(struct acpi_device *device)
497 struct acpi_device_bus_id *acpi_device_bus_id;
499 mutex_lock(&acpi_device_lock);
501 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
502 if (!strcmp(acpi_device_bus_id->bus_id,
503 acpi_device_hid(device))) {
504 ida_free(&acpi_device_bus_id->instance_ida,
505 device->pnp.instance_no);
506 if (ida_is_empty(&acpi_device_bus_id->instance_ida)) {
507 list_del(&acpi_device_bus_id->node);
508 kfree_const(acpi_device_bus_id->bus_id);
509 kfree(acpi_device_bus_id);
514 list_del(&device->wakeup_list);
516 mutex_unlock(&acpi_device_lock);
518 acpi_power_add_remove_device(device, false);
519 acpi_device_remove_files(device);
521 device->remove(device);
523 device_del(&device->dev);
526 static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
528 static LIST_HEAD(acpi_device_del_list);
529 static DEFINE_MUTEX(acpi_device_del_lock);
531 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
534 struct acpi_device *adev;
536 mutex_lock(&acpi_device_del_lock);
538 if (list_empty(&acpi_device_del_list)) {
539 mutex_unlock(&acpi_device_del_lock);
542 adev = list_first_entry(&acpi_device_del_list,
543 struct acpi_device, del_list);
544 list_del(&adev->del_list);
546 mutex_unlock(&acpi_device_del_lock);
548 blocking_notifier_call_chain(&acpi_reconfig_chain,
549 ACPI_RECONFIG_DEVICE_REMOVE, adev);
551 acpi_device_del(adev);
553 * Drop references to all power resources that might have been
554 * used by the device.
556 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
562 * acpi_scan_drop_device - Drop an ACPI device object.
563 * @handle: Handle of an ACPI namespace node, not used.
564 * @context: Address of the ACPI device object to drop.
566 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
567 * namespace node the device object pointed to by @context is attached to.
569 * The unregistration is carried out asynchronously to avoid running
570 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
571 * ensure the correct ordering (the device objects must be unregistered in the
572 * same order in which the corresponding namespace nodes are deleted).
574 static void acpi_scan_drop_device(acpi_handle handle, void *context)
576 static DECLARE_WORK(work, acpi_device_del_work_fn);
577 struct acpi_device *adev = context;
579 mutex_lock(&acpi_device_del_lock);
582 * Use the ACPI hotplug workqueue which is ordered, so this work item
583 * won't run after any hotplug work items submitted subsequently. That
584 * prevents attempts to register device objects identical to those being
585 * deleted from happening concurrently (such attempts result from
586 * hotplug events handled via the ACPI hotplug workqueue). It also will
587 * run after all of the work items submitted previously, which helps
588 * those work items to ensure that they are not accessing stale device
591 if (list_empty(&acpi_device_del_list))
592 acpi_queue_hotplug_work(&work);
594 list_add_tail(&adev->del_list, &acpi_device_del_list);
595 /* Make acpi_ns_validate_handle() return NULL for this handle. */
596 adev->handle = INVALID_ACPI_HANDLE;
598 mutex_unlock(&acpi_device_del_lock);
601 static struct acpi_device *handle_to_device(acpi_handle handle,
602 void (*callback)(void *))
604 struct acpi_device *adev = NULL;
607 status = acpi_get_data_full(handle, acpi_scan_drop_device,
608 (void **)&adev, callback);
609 if (ACPI_FAILURE(status) || !adev) {
610 acpi_handle_debug(handle, "No context!\n");
617 * acpi_fetch_acpi_dev - Retrieve ACPI device object.
618 * @handle: ACPI handle associated with the requested ACPI device object.
620 * Return a pointer to the ACPI device object associated with @handle, if
621 * present, or NULL otherwise.
623 struct acpi_device *acpi_fetch_acpi_dev(acpi_handle handle)
625 return handle_to_device(handle, NULL);
627 EXPORT_SYMBOL_GPL(acpi_fetch_acpi_dev);
629 static void get_acpi_device(void *dev)
635 * acpi_get_acpi_dev - Retrieve ACPI device object and reference count it.
636 * @handle: ACPI handle associated with the requested ACPI device object.
638 * Return a pointer to the ACPI device object associated with @handle and bump
639 * up that object's reference counter (under the ACPI Namespace lock), if
640 * present, or return NULL otherwise.
642 * The ACPI device object reference acquired by this function needs to be
643 * dropped via acpi_dev_put().
645 struct acpi_device *acpi_get_acpi_dev(acpi_handle handle)
647 return handle_to_device(handle, get_acpi_device);
649 EXPORT_SYMBOL_GPL(acpi_get_acpi_dev);
651 static struct acpi_device_bus_id *acpi_device_bus_id_match(const char *dev_id)
653 struct acpi_device_bus_id *acpi_device_bus_id;
655 /* Find suitable bus_id and instance number in acpi_bus_id_list. */
656 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
657 if (!strcmp(acpi_device_bus_id->bus_id, dev_id))
658 return acpi_device_bus_id;
663 static int acpi_device_set_name(struct acpi_device *device,
664 struct acpi_device_bus_id *acpi_device_bus_id)
666 struct ida *instance_ida = &acpi_device_bus_id->instance_ida;
669 result = ida_alloc(instance_ida, GFP_KERNEL);
673 device->pnp.instance_no = result;
674 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, result);
678 int acpi_tie_acpi_dev(struct acpi_device *adev)
680 acpi_handle handle = adev->handle;
686 status = acpi_attach_data(handle, acpi_scan_drop_device, adev);
687 if (ACPI_FAILURE(status)) {
688 acpi_handle_err(handle, "Unable to attach device data\n");
695 static void acpi_store_pld_crc(struct acpi_device *adev)
697 struct acpi_pld_info *pld;
700 status = acpi_get_physical_device_location(adev->handle, &pld);
701 if (ACPI_FAILURE(status))
704 adev->pld_crc = crc32(~0, pld, sizeof(*pld));
708 int acpi_device_add(struct acpi_device *device)
710 struct acpi_device_bus_id *acpi_device_bus_id;
716 * Link this device to its parent and siblings.
718 INIT_LIST_HEAD(&device->wakeup_list);
719 INIT_LIST_HEAD(&device->physical_node_list);
720 INIT_LIST_HEAD(&device->del_list);
721 mutex_init(&device->physical_node_lock);
723 mutex_lock(&acpi_device_lock);
725 acpi_device_bus_id = acpi_device_bus_id_match(acpi_device_hid(device));
726 if (acpi_device_bus_id) {
727 result = acpi_device_set_name(device, acpi_device_bus_id);
731 acpi_device_bus_id = kzalloc(sizeof(*acpi_device_bus_id),
733 if (!acpi_device_bus_id) {
737 acpi_device_bus_id->bus_id =
738 kstrdup_const(acpi_device_hid(device), GFP_KERNEL);
739 if (!acpi_device_bus_id->bus_id) {
740 kfree(acpi_device_bus_id);
745 ida_init(&acpi_device_bus_id->instance_ida);
747 result = acpi_device_set_name(device, acpi_device_bus_id);
749 kfree_const(acpi_device_bus_id->bus_id);
750 kfree(acpi_device_bus_id);
754 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
757 if (device->wakeup.flags.valid)
758 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
760 acpi_store_pld_crc(device);
762 mutex_unlock(&acpi_device_lock);
764 result = device_add(&device->dev);
766 dev_err(&device->dev, "Error registering device\n");
770 result = acpi_device_setup_files(device);
772 pr_err("Error creating sysfs interface for device %s\n",
773 dev_name(&device->dev));
778 mutex_lock(&acpi_device_lock);
780 list_del(&device->wakeup_list);
783 mutex_unlock(&acpi_device_lock);
785 acpi_detach_data(device->handle, acpi_scan_drop_device);
790 /* --------------------------------------------------------------------------
792 -------------------------------------------------------------------------- */
793 static bool acpi_info_matches_ids(struct acpi_device_info *info,
794 const char * const ids[])
796 struct acpi_pnp_device_id_list *cid_list = NULL;
799 if (!(info->valid & ACPI_VALID_HID))
802 index = match_string(ids, -1, info->hardware_id.string);
806 if (info->valid & ACPI_VALID_CID)
807 cid_list = &info->compatible_id_list;
812 for (i = 0; i < cid_list->count; i++) {
813 index = match_string(ids, -1, cid_list->ids[i].string);
821 /* List of HIDs for which we ignore matching ACPI devices, when checking _DEP lists. */
822 static const char * const acpi_ignore_dep_ids[] = {
823 "PNP0D80", /* Windows-compatible System Power Management Controller */
824 "INT33BD", /* Intel Baytrail Mailbox Device */
825 "LATT2021", /* Lattice FW Update Client Driver */
829 /* List of HIDs for which we honor deps of matching ACPI devs, when checking _DEP lists. */
830 static const char * const acpi_honor_dep_ids[] = {
831 "INT3472", /* Camera sensor PMIC / clk and regulator info */
832 "INTC1059", /* IVSC (TGL) driver must be loaded to allow i2c access to camera sensors */
833 "INTC1095", /* IVSC (ADL) driver must be loaded to allow i2c access to camera sensors */
834 "INTC100A", /* IVSC (RPL) driver must be loaded to allow i2c access to camera sensors */
835 "INTC10CF", /* IVSC (MTL) driver must be loaded to allow i2c access to camera sensors */
839 static struct acpi_device *acpi_find_parent_acpi_dev(acpi_handle handle)
841 struct acpi_device *adev;
844 * Fixed hardware devices do not appear in the namespace and do not
845 * have handles, but we fabricate acpi_devices for them, so we have
846 * to deal with them specially.
854 status = acpi_get_parent(handle, &handle);
855 if (ACPI_FAILURE(status)) {
856 if (status != AE_NULL_ENTRY)
861 adev = acpi_fetch_acpi_dev(handle);
867 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
871 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
872 union acpi_object *obj;
874 status = acpi_get_handle(handle, "_EJD", &tmp);
875 if (ACPI_FAILURE(status))
878 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
879 if (ACPI_SUCCESS(status)) {
880 obj = buffer.pointer;
881 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
883 kfree(buffer.pointer);
887 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
889 static int acpi_bus_extract_wakeup_device_power_package(struct acpi_device *dev)
891 acpi_handle handle = dev->handle;
892 struct acpi_device_wakeup *wakeup = &dev->wakeup;
893 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
894 union acpi_object *package = NULL;
895 union acpi_object *element = NULL;
899 INIT_LIST_HEAD(&wakeup->resources);
902 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
903 if (ACPI_FAILURE(status)) {
904 acpi_handle_info(handle, "_PRW evaluation failed: %s\n",
905 acpi_format_exception(status));
909 package = (union acpi_object *)buffer.pointer;
911 if (!package || package->package.count < 2)
914 element = &(package->package.elements[0]);
918 if (element->type == ACPI_TYPE_PACKAGE) {
919 if ((element->package.count < 2) ||
920 (element->package.elements[0].type !=
921 ACPI_TYPE_LOCAL_REFERENCE)
922 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
926 element->package.elements[0].reference.handle;
928 (u32) element->package.elements[1].integer.value;
929 } else if (element->type == ACPI_TYPE_INTEGER) {
930 wakeup->gpe_device = NULL;
931 wakeup->gpe_number = element->integer.value;
936 element = &(package->package.elements[1]);
937 if (element->type != ACPI_TYPE_INTEGER)
940 wakeup->sleep_state = element->integer.value;
942 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
946 if (!list_empty(&wakeup->resources)) {
949 err = acpi_power_wakeup_list_init(&wakeup->resources,
952 acpi_handle_warn(handle, "Retrieving current states "
953 "of wakeup power resources failed\n");
954 acpi_power_resources_list_free(&wakeup->resources);
957 if (sleep_state < wakeup->sleep_state) {
958 acpi_handle_warn(handle, "Overriding _PRW sleep state "
959 "(S%d) by S%d from power resources\n",
960 (int)wakeup->sleep_state, sleep_state);
961 wakeup->sleep_state = sleep_state;
966 kfree(buffer.pointer);
970 /* Do not use a button for S5 wakeup */
971 #define ACPI_AVOID_WAKE_FROM_S5 BIT(0)
973 static bool acpi_wakeup_gpe_init(struct acpi_device *device)
975 static const struct acpi_device_id button_device_ids[] = {
976 {"PNP0C0C", 0}, /* Power button */
977 {"PNP0C0D", ACPI_AVOID_WAKE_FROM_S5}, /* Lid */
978 {"PNP0C0E", ACPI_AVOID_WAKE_FROM_S5}, /* Sleep button */
981 struct acpi_device_wakeup *wakeup = &device->wakeup;
982 const struct acpi_device_id *match;
985 wakeup->flags.notifier_present = 0;
987 /* Power button, Lid switch always enable wakeup */
988 match = acpi_match_acpi_device(button_device_ids, device);
990 if ((match->driver_data & ACPI_AVOID_WAKE_FROM_S5) &&
991 wakeup->sleep_state == ACPI_STATE_S5)
992 wakeup->sleep_state = ACPI_STATE_S4;
993 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
994 device_set_wakeup_capable(&device->dev, true);
998 status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
1000 return ACPI_SUCCESS(status);
1003 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1007 /* Presence of _PRW indicates wake capable */
1008 if (!acpi_has_method(device->handle, "_PRW"))
1011 err = acpi_bus_extract_wakeup_device_power_package(device);
1013 dev_err(&device->dev, "Unable to extract wakeup power resources");
1017 device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
1018 device->wakeup.prepare_count = 0;
1020 * Call _PSW/_DSW object to disable its ability to wake the sleeping
1021 * system for the ACPI device with the _PRW object.
1022 * The _PSW object is deprecated in ACPI 3.0 and is replaced by _DSW.
1023 * So it is necessary to call _DSW object first. Only when it is not
1024 * present will the _PSW object used.
1026 err = acpi_device_sleep_wake(device, 0, 0, 0);
1028 pr_debug("error in _DSW or _PSW evaluation\n");
1031 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1033 struct acpi_device_power_state *ps = &device->power.states[state];
1034 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1035 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1038 INIT_LIST_HEAD(&ps->resources);
1040 /* Evaluate "_PRx" to get referenced power resources */
1041 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1042 if (ACPI_SUCCESS(status)) {
1043 union acpi_object *package = buffer.pointer;
1045 if (buffer.length && package
1046 && package->type == ACPI_TYPE_PACKAGE
1047 && package->package.count)
1048 acpi_extract_power_resources(package, 0, &ps->resources);
1050 ACPI_FREE(buffer.pointer);
1053 /* Evaluate "_PSx" to see if we can do explicit sets */
1055 if (acpi_has_method(device->handle, pathname))
1056 ps->flags.explicit_set = 1;
1058 /* State is valid if there are means to put the device into it. */
1059 if (!list_empty(&ps->resources) || ps->flags.explicit_set)
1060 ps->flags.valid = 1;
1062 ps->power = -1; /* Unknown - driver assigned */
1063 ps->latency = -1; /* Unknown - driver assigned */
1066 static void acpi_bus_get_power_flags(struct acpi_device *device)
1068 unsigned long long dsc = ACPI_STATE_D0;
1071 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1072 if (!acpi_has_method(device->handle, "_PS0") &&
1073 !acpi_has_method(device->handle, "_PR0"))
1076 device->flags.power_manageable = 1;
1079 * Power Management Flags
1081 if (acpi_has_method(device->handle, "_PSC"))
1082 device->power.flags.explicit_get = 1;
1084 if (acpi_has_method(device->handle, "_IRC"))
1085 device->power.flags.inrush_current = 1;
1087 if (acpi_has_method(device->handle, "_DSW"))
1088 device->power.flags.dsw_present = 1;
1090 acpi_evaluate_integer(device->handle, "_DSC", NULL, &dsc);
1091 device->power.state_for_enumeration = dsc;
1094 * Enumerate supported power management states
1096 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1097 acpi_bus_init_power_state(device, i);
1099 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1101 /* Set the defaults for D0 and D3hot (always supported). */
1102 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1103 device->power.states[ACPI_STATE_D0].power = 100;
1104 device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
1107 * Use power resources only if the D0 list of them is populated, because
1108 * some platforms may provide _PR3 only to indicate D3cold support and
1109 * in those cases the power resources list returned by it may be bogus.
1111 if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) {
1112 device->power.flags.power_resources = 1;
1114 * D3cold is supported if the D3hot list of power resources is
1117 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
1118 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1121 if (acpi_bus_init_power(device))
1122 device->flags.power_manageable = 0;
1125 static void acpi_bus_get_flags(struct acpi_device *device)
1127 /* Presence of _STA indicates 'dynamic_status' */
1128 if (acpi_has_method(device->handle, "_STA"))
1129 device->flags.dynamic_status = 1;
1131 /* Presence of _RMV indicates 'removable' */
1132 if (acpi_has_method(device->handle, "_RMV"))
1133 device->flags.removable = 1;
1135 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1136 if (acpi_has_method(device->handle, "_EJD") ||
1137 acpi_has_method(device->handle, "_EJ0"))
1138 device->flags.ejectable = 1;
1141 static void acpi_device_get_busid(struct acpi_device *device)
1143 char bus_id[5] = { '?', 0 };
1144 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1150 * The device's Bus ID is simply the object name.
1151 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1153 if (!acpi_dev_parent(device)) {
1154 strcpy(device->pnp.bus_id, "ACPI");
1158 switch (device->device_type) {
1159 case ACPI_BUS_TYPE_POWER_BUTTON:
1160 strcpy(device->pnp.bus_id, "PWRF");
1162 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1163 strcpy(device->pnp.bus_id, "SLPF");
1165 case ACPI_BUS_TYPE_ECDT_EC:
1166 strcpy(device->pnp.bus_id, "ECDT");
1169 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1170 /* Clean up trailing underscores (if any) */
1171 for (i = 3; i > 1; i--) {
1172 if (bus_id[i] == '_')
1177 strcpy(device->pnp.bus_id, bus_id);
1183 * acpi_ata_match - see if an acpi object is an ATA device
1185 * If an acpi object has one of the ACPI ATA methods defined,
1186 * then we can safely call it an ATA device.
1188 bool acpi_ata_match(acpi_handle handle)
1190 return acpi_has_method(handle, "_GTF") ||
1191 acpi_has_method(handle, "_GTM") ||
1192 acpi_has_method(handle, "_STM") ||
1193 acpi_has_method(handle, "_SDD");
1197 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1199 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1200 * then we can safely call it an ejectable drive bay
1202 bool acpi_bay_match(acpi_handle handle)
1204 acpi_handle phandle;
1206 if (!acpi_has_method(handle, "_EJ0"))
1208 if (acpi_ata_match(handle))
1210 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1213 return acpi_ata_match(phandle);
1216 bool acpi_device_is_battery(struct acpi_device *adev)
1218 struct acpi_hardware_id *hwid;
1220 list_for_each_entry(hwid, &adev->pnp.ids, list)
1221 if (!strcmp("PNP0C0A", hwid->id))
1227 static bool is_ejectable_bay(struct acpi_device *adev)
1229 acpi_handle handle = adev->handle;
1231 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1234 return acpi_bay_match(handle);
1238 * acpi_dock_match - see if an acpi object has a _DCK method
1240 bool acpi_dock_match(acpi_handle handle)
1242 return acpi_has_method(handle, "_DCK");
1246 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1247 void **return_value)
1249 long *cap = context;
1251 if (acpi_has_method(handle, "_BCM") &&
1252 acpi_has_method(handle, "_BCL")) {
1253 acpi_handle_debug(handle, "Found generic backlight support\n");
1254 *cap |= ACPI_VIDEO_BACKLIGHT;
1255 /* We have backlight support, no need to scan further */
1256 return AE_CTRL_TERMINATE;
1261 /* Returns true if the ACPI object is a video device which can be
1262 * handled by video.ko.
1263 * The device will get a Linux specific CID added in scan.c to
1264 * identify the device as an ACPI graphics device
1265 * Be aware that the graphics device may not be physically present
1266 * Use acpi_video_get_capabilities() to detect general ACPI video
1267 * capabilities of present cards
1269 long acpi_is_video_device(acpi_handle handle)
1271 long video_caps = 0;
1273 /* Is this device able to support video switching ? */
1274 if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1275 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1277 /* Is this device able to retrieve a video ROM ? */
1278 if (acpi_has_method(handle, "_ROM"))
1279 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1281 /* Is this device able to configure which video head to be POSTed ? */
1282 if (acpi_has_method(handle, "_VPO") &&
1283 acpi_has_method(handle, "_GPD") &&
1284 acpi_has_method(handle, "_SPD"))
1285 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1287 /* Only check for backlight functionality if one of the above hit. */
1289 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1290 ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1295 EXPORT_SYMBOL(acpi_is_video_device);
1297 const char *acpi_device_hid(struct acpi_device *device)
1299 struct acpi_hardware_id *hid;
1301 if (list_empty(&device->pnp.ids))
1304 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1307 EXPORT_SYMBOL(acpi_device_hid);
1309 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1311 struct acpi_hardware_id *id;
1313 id = kmalloc(sizeof(*id), GFP_KERNEL);
1317 id->id = kstrdup_const(dev_id, GFP_KERNEL);
1323 list_add_tail(&id->list, &pnp->ids);
1324 pnp->type.hardware_id = 1;
1328 * Old IBM workstations have a DSDT bug wherein the SMBus object
1329 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1330 * prefix. Work around this.
1332 static bool acpi_ibm_smbus_match(acpi_handle handle)
1334 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1335 struct acpi_buffer path = { sizeof(node_name), node_name };
1337 if (!dmi_name_in_vendors("IBM"))
1340 /* Look for SMBS object */
1341 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1342 strcmp("SMBS", path.pointer))
1345 /* Does it have the necessary (but misnamed) methods? */
1346 if (acpi_has_method(handle, "SBI") &&
1347 acpi_has_method(handle, "SBR") &&
1348 acpi_has_method(handle, "SBW"))
1354 static bool acpi_object_is_system_bus(acpi_handle handle)
1358 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1361 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1368 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1371 struct acpi_device_info *info = NULL;
1372 struct acpi_pnp_device_id_list *cid_list;
1375 switch (device_type) {
1376 case ACPI_BUS_TYPE_DEVICE:
1377 if (handle == ACPI_ROOT_OBJECT) {
1378 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1382 acpi_get_object_info(handle, &info);
1384 pr_err("%s: Error reading device info\n", __func__);
1388 if (info->valid & ACPI_VALID_HID) {
1389 acpi_add_id(pnp, info->hardware_id.string);
1390 pnp->type.platform_id = 1;
1392 if (info->valid & ACPI_VALID_CID) {
1393 cid_list = &info->compatible_id_list;
1394 for (i = 0; i < cid_list->count; i++)
1395 acpi_add_id(pnp, cid_list->ids[i].string);
1397 if (info->valid & ACPI_VALID_ADR) {
1398 pnp->bus_address = info->address;
1399 pnp->type.bus_address = 1;
1401 if (info->valid & ACPI_VALID_UID)
1402 pnp->unique_id = kstrdup(info->unique_id.string,
1404 if (info->valid & ACPI_VALID_CLS)
1405 acpi_add_id(pnp, info->class_code.string);
1410 * Some devices don't reliably have _HIDs & _CIDs, so add
1411 * synthetic HIDs to make sure drivers can find them.
1413 if (acpi_is_video_device(handle)) {
1414 acpi_add_id(pnp, ACPI_VIDEO_HID);
1415 pnp->type.backlight = 1;
1418 if (acpi_bay_match(handle))
1419 acpi_add_id(pnp, ACPI_BAY_HID);
1420 else if (acpi_dock_match(handle))
1421 acpi_add_id(pnp, ACPI_DOCK_HID);
1422 else if (acpi_ibm_smbus_match(handle))
1423 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1424 else if (list_empty(&pnp->ids) &&
1425 acpi_object_is_system_bus(handle)) {
1426 /* \_SB, \_TZ, LNXSYBUS */
1427 acpi_add_id(pnp, ACPI_BUS_HID);
1428 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1429 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1433 case ACPI_BUS_TYPE_POWER:
1434 acpi_add_id(pnp, ACPI_POWER_HID);
1436 case ACPI_BUS_TYPE_PROCESSOR:
1437 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1439 case ACPI_BUS_TYPE_THERMAL:
1440 acpi_add_id(pnp, ACPI_THERMAL_HID);
1442 case ACPI_BUS_TYPE_POWER_BUTTON:
1443 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1445 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1446 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1448 case ACPI_BUS_TYPE_ECDT_EC:
1449 acpi_add_id(pnp, ACPI_ECDT_HID);
1454 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1456 struct acpi_hardware_id *id, *tmp;
1458 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1459 kfree_const(id->id);
1462 kfree(pnp->unique_id);
1466 * acpi_dma_supported - Check DMA support for the specified device.
1467 * @adev: The pointer to acpi device
1469 * Return false if DMA is not supported. Otherwise, return true
1471 bool acpi_dma_supported(const struct acpi_device *adev)
1476 if (adev->flags.cca_seen)
1480 * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1481 * DMA on "Intel platforms". Presumably that includes all x86 and
1482 * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1484 if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1491 * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1492 * @adev: The pointer to acpi device
1494 * Return enum dev_dma_attr.
1496 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1498 if (!acpi_dma_supported(adev))
1499 return DEV_DMA_NOT_SUPPORTED;
1501 if (adev->flags.coherent_dma)
1502 return DEV_DMA_COHERENT;
1504 return DEV_DMA_NON_COHERENT;
1508 * acpi_dma_get_range() - Get device DMA parameters.
1510 * @dev: device to configure
1511 * @map: pointer to DMA ranges result
1513 * Evaluate DMA regions and return pointer to DMA regions on
1514 * parsing success; it does not update the passed in values on failure.
1516 * Return 0 on success, < 0 on failure.
1518 int acpi_dma_get_range(struct device *dev, const struct bus_dma_region **map)
1520 struct acpi_device *adev;
1522 struct resource_entry *rentry;
1524 struct device *dma_dev = dev;
1525 struct bus_dma_region *r;
1528 * Walk the device tree chasing an ACPI companion with a _DMA
1529 * object while we go. Stop if we find a device with an ACPI
1530 * companion containing a _DMA method.
1533 adev = ACPI_COMPANION(dma_dev);
1534 if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
1537 dma_dev = dma_dev->parent;
1543 if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
1544 acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
1548 ret = acpi_dev_get_dma_resources(adev, &list);
1550 r = kcalloc(ret + 1, sizeof(*r), GFP_KERNEL);
1558 list_for_each_entry(rentry, &list, node) {
1559 if (rentry->res->start >= rentry->res->end) {
1563 dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
1567 r->cpu_start = rentry->res->start;
1568 r->dma_start = rentry->res->start - rentry->offset;
1569 r->size = resource_size(rentry->res);
1574 acpi_dev_free_resource_list(&list);
1576 return ret >= 0 ? 0 : ret;
1579 #ifdef CONFIG_IOMMU_API
1580 int acpi_iommu_fwspec_init(struct device *dev, u32 id,
1581 struct fwnode_handle *fwnode,
1582 const struct iommu_ops *ops)
1584 int ret = iommu_fwspec_init(dev, fwnode, ops);
1587 ret = iommu_fwspec_add_ids(dev, &id, 1);
1592 static inline const struct iommu_ops *acpi_iommu_fwspec_ops(struct device *dev)
1594 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
1596 return fwspec ? fwspec->ops : NULL;
1599 static int acpi_iommu_configure_id(struct device *dev, const u32 *id_in)
1602 const struct iommu_ops *ops;
1604 /* Serialise to make dev->iommu stable under our potential fwspec */
1605 mutex_lock(&iommu_probe_device_lock);
1607 * If we already translated the fwspec there is nothing left to do,
1608 * return the iommu_ops.
1610 ops = acpi_iommu_fwspec_ops(dev);
1612 mutex_unlock(&iommu_probe_device_lock);
1616 err = iort_iommu_configure_id(dev, id_in);
1617 if (err && err != -EPROBE_DEFER)
1618 err = viot_iommu_configure(dev);
1619 mutex_unlock(&iommu_probe_device_lock);
1622 * If we have reason to believe the IOMMU driver missed the initial
1623 * iommu_probe_device() call for dev, replay it to get things in order.
1625 if (!err && dev->bus)
1626 err = iommu_probe_device(dev);
1628 /* Ignore all other errors apart from EPROBE_DEFER */
1629 if (err == -EPROBE_DEFER) {
1632 dev_dbg(dev, "Adding to IOMMU failed: %d\n", err);
1635 if (!acpi_iommu_fwspec_ops(dev))
1640 #else /* !CONFIG_IOMMU_API */
1642 int acpi_iommu_fwspec_init(struct device *dev, u32 id,
1643 struct fwnode_handle *fwnode,
1644 const struct iommu_ops *ops)
1649 static int acpi_iommu_configure_id(struct device *dev, const u32 *id_in)
1654 #endif /* !CONFIG_IOMMU_API */
1657 * acpi_dma_configure_id - Set-up DMA configuration for the device.
1658 * @dev: The pointer to the device
1659 * @attr: device dma attributes
1660 * @input_id: input device id const value pointer
1662 int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
1663 const u32 *input_id)
1667 if (attr == DEV_DMA_NOT_SUPPORTED) {
1668 set_dma_ops(dev, &dma_dummy_ops);
1672 acpi_arch_dma_setup(dev);
1674 ret = acpi_iommu_configure_id(dev, input_id);
1675 if (ret == -EPROBE_DEFER)
1676 return -EPROBE_DEFER;
1679 * Historically this routine doesn't fail driver probing due to errors
1680 * in acpi_iommu_configure_id()
1683 arch_setup_dma_ops(dev, 0, U64_MAX, attr == DEV_DMA_COHERENT);
1687 EXPORT_SYMBOL_GPL(acpi_dma_configure_id);
1689 static void acpi_init_coherency(struct acpi_device *adev)
1691 unsigned long long cca = 0;
1693 struct acpi_device *parent = acpi_dev_parent(adev);
1695 if (parent && parent->flags.cca_seen) {
1697 * From ACPI spec, OSPM will ignore _CCA if an ancestor
1700 adev->flags.cca_seen = 1;
1701 cca = parent->flags.coherent_dma;
1703 status = acpi_evaluate_integer(adev->handle, "_CCA",
1705 if (ACPI_SUCCESS(status))
1706 adev->flags.cca_seen = 1;
1707 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1709 * If architecture does not specify that _CCA is
1710 * required for DMA-able devices (e.g. x86),
1711 * we default to _CCA=1.
1715 acpi_handle_debug(adev->handle,
1716 "ACPI device is missing _CCA.\n");
1719 adev->flags.coherent_dma = cca;
1722 static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
1724 bool *is_serial_bus_slave_p = data;
1726 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1729 *is_serial_bus_slave_p = true;
1731 /* no need to do more checking */
1735 static bool acpi_is_indirect_io_slave(struct acpi_device *device)
1737 struct acpi_device *parent = acpi_dev_parent(device);
1738 static const struct acpi_device_id indirect_io_hosts[] = {
1743 return parent && !acpi_match_device_ids(parent, indirect_io_hosts);
1746 static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
1748 struct list_head resource_list;
1749 bool is_serial_bus_slave = false;
1750 static const struct acpi_device_id ignore_serial_bus_ids[] = {
1752 * These devices have multiple SerialBus resources and a client
1753 * device must be instantiated for each of them, each with
1754 * its own device id.
1755 * Normally we only instantiate one client device for the first
1756 * resource, using the ACPI HID as id. These special cases are handled
1757 * by the drivers/platform/x86/serial-multi-instantiate.c driver, which
1758 * knows which client device id to use for each resource.
1768 /* Non-conforming _HID for Cirrus Logic already released */
1772 * Some ACPI devs contain SerialBus resources even though they are not
1773 * attached to a serial bus at all.
1778 * HIDs of device with an UartSerialBusV2 resource for which userspace
1779 * expects a regular tty cdev to be created (instead of the in kernel
1780 * serdev) and which have a kernel driver which expects a platform_dev
1781 * such as the rfkill-gpio driver.
1788 if (acpi_is_indirect_io_slave(device))
1791 /* Macs use device properties in lieu of _CRS resources */
1792 if (x86_apple_machine &&
1793 (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||
1794 fwnode_property_present(&device->fwnode, "i2cAddress") ||
1795 fwnode_property_present(&device->fwnode, "baud")))
1798 if (!acpi_match_device_ids(device, ignore_serial_bus_ids))
1801 INIT_LIST_HEAD(&resource_list);
1802 acpi_dev_get_resources(device, &resource_list,
1803 acpi_check_serial_bus_slave,
1804 &is_serial_bus_slave);
1805 acpi_dev_free_resource_list(&resource_list);
1807 return is_serial_bus_slave;
1810 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1811 int type, void (*release)(struct device *))
1813 struct acpi_device *parent = acpi_find_parent_acpi_dev(handle);
1815 INIT_LIST_HEAD(&device->pnp.ids);
1816 device->device_type = type;
1817 device->handle = handle;
1818 device->dev.parent = parent ? &parent->dev : NULL;
1819 device->dev.release = release;
1820 device->dev.bus = &acpi_bus_type;
1821 fwnode_init(&device->fwnode, &acpi_device_fwnode_ops);
1822 acpi_set_device_status(device, ACPI_STA_DEFAULT);
1823 acpi_device_get_busid(device);
1824 acpi_set_pnp_ids(handle, &device->pnp, type);
1825 acpi_init_properties(device);
1826 acpi_bus_get_flags(device);
1827 device->flags.match_driver = false;
1828 device->flags.initialized = true;
1829 device->flags.enumeration_by_parent =
1830 acpi_device_enumeration_by_parent(device);
1831 acpi_device_clear_enumerated(device);
1832 device_initialize(&device->dev);
1833 dev_set_uevent_suppress(&device->dev, true);
1834 acpi_init_coherency(device);
1837 static void acpi_scan_dep_init(struct acpi_device *adev)
1839 struct acpi_dep_data *dep;
1841 list_for_each_entry(dep, &acpi_dep_list, node) {
1842 if (dep->consumer == adev->handle) {
1844 adev->flags.honor_deps = 1;
1851 void acpi_device_add_finalize(struct acpi_device *device)
1853 dev_set_uevent_suppress(&device->dev, false);
1854 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1857 static void acpi_scan_init_status(struct acpi_device *adev)
1859 if (acpi_bus_get_status(adev))
1860 acpi_set_device_status(adev, 0);
1863 static int acpi_add_single_object(struct acpi_device **child,
1864 acpi_handle handle, int type, bool dep_init)
1866 struct acpi_device *device;
1867 bool release_dep_lock = false;
1870 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1874 acpi_init_device_object(device, handle, type, acpi_device_release);
1876 * Getting the status is delayed till here so that we can call
1877 * acpi_bus_get_status() and use its quirk handling. Note that
1878 * this must be done before the get power-/wakeup_dev-flags calls.
1880 if (type == ACPI_BUS_TYPE_DEVICE || type == ACPI_BUS_TYPE_PROCESSOR) {
1882 mutex_lock(&acpi_dep_list_lock);
1884 * Hold the lock until the acpi_tie_acpi_dev() call
1885 * below to prevent concurrent acpi_scan_clear_dep()
1886 * from deleting a dependency list entry without
1887 * updating dep_unmet for the device.
1889 release_dep_lock = true;
1890 acpi_scan_dep_init(device);
1892 acpi_scan_init_status(device);
1895 acpi_bus_get_power_flags(device);
1896 acpi_bus_get_wakeup_device_flags(device);
1898 result = acpi_tie_acpi_dev(device);
1900 if (release_dep_lock)
1901 mutex_unlock(&acpi_dep_list_lock);
1904 result = acpi_device_add(device);
1907 acpi_device_release(&device->dev);
1911 acpi_power_add_remove_device(device, true);
1912 acpi_device_add_finalize(device);
1914 acpi_handle_debug(handle, "Added as %s, parent %s\n",
1915 dev_name(&device->dev), device->dev.parent ?
1916 dev_name(device->dev.parent) : "(null)");
1922 static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1925 struct resource *res = context;
1927 if (acpi_dev_resource_memory(ares, res))
1928 return AE_CTRL_TERMINATE;
1933 static bool acpi_device_should_be_hidden(acpi_handle handle)
1936 struct resource res;
1938 /* Check if it should ignore the UART device */
1939 if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1943 * The UART device described in SPCR table is assumed to have only one
1944 * memory resource present. So we only look for the first one here.
1946 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1947 acpi_get_resource_memory, &res);
1948 if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1951 acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1957 bool acpi_device_is_present(const struct acpi_device *adev)
1959 return adev->status.present || adev->status.functional;
1962 bool acpi_device_is_enabled(const struct acpi_device *adev)
1964 return adev->status.present && adev->status.enabled;
1967 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1969 const struct acpi_device_id **matchid)
1971 const struct acpi_device_id *devid;
1974 return handler->match(idstr, matchid);
1976 for (devid = handler->ids; devid->id[0]; devid++)
1977 if (!strcmp((char *)devid->id, idstr)) {
1987 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1988 const struct acpi_device_id **matchid)
1990 struct acpi_scan_handler *handler;
1992 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1993 if (acpi_scan_handler_matching(handler, idstr, matchid))
1999 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
2001 if (!!hotplug->enabled == !!val)
2004 mutex_lock(&acpi_scan_lock);
2006 hotplug->enabled = val;
2008 mutex_unlock(&acpi_scan_lock);
2011 static void acpi_scan_init_hotplug(struct acpi_device *adev)
2013 struct acpi_hardware_id *hwid;
2015 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
2016 acpi_dock_add(adev);
2019 list_for_each_entry(hwid, &adev->pnp.ids, list) {
2020 struct acpi_scan_handler *handler;
2022 handler = acpi_scan_match_handler(hwid->id, NULL);
2024 adev->flags.hotplug_notify = true;
2030 static u32 acpi_scan_check_dep(acpi_handle handle)
2032 struct acpi_handle_list dep_devices;
2037 * Check for _HID here to avoid deferring the enumeration of:
2039 * 2. ACPI nodes describing USB ports.
2040 * Still, checking for _HID catches more then just these cases ...
2042 if (!acpi_has_method(handle, "_DEP") || !acpi_has_method(handle, "_HID"))
2045 if (!acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices)) {
2046 acpi_handle_debug(handle, "Failed to evaluate _DEP.\n");
2050 for (count = 0, i = 0; i < dep_devices.count; i++) {
2051 struct acpi_device_info *info;
2052 struct acpi_dep_data *dep;
2053 bool skip, honor_dep;
2056 status = acpi_get_object_info(dep_devices.handles[i], &info);
2057 if (ACPI_FAILURE(status)) {
2058 acpi_handle_debug(handle, "Error reading _DEP device info\n");
2062 skip = acpi_info_matches_ids(info, acpi_ignore_dep_ids);
2063 honor_dep = acpi_info_matches_ids(info, acpi_honor_dep_ids);
2069 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
2075 dep->supplier = dep_devices.handles[i];
2076 dep->consumer = handle;
2077 dep->honor_dep = honor_dep;
2079 mutex_lock(&acpi_dep_list_lock);
2080 list_add_tail(&dep->node , &acpi_dep_list);
2081 mutex_unlock(&acpi_dep_list_lock);
2084 acpi_handle_list_free(&dep_devices);
2088 static acpi_status acpi_scan_check_crs_csi2_cb(acpi_handle handle, u32 a, void *b, void **c)
2090 acpi_mipi_check_crs_csi2(handle);
2094 static acpi_status acpi_bus_check_add(acpi_handle handle, bool first_pass,
2095 struct acpi_device **adev_p)
2097 struct acpi_device *device = acpi_fetch_acpi_dev(handle);
2098 acpi_object_type acpi_type;
2104 if (ACPI_FAILURE(acpi_get_type(handle, &acpi_type)))
2107 switch (acpi_type) {
2108 case ACPI_TYPE_DEVICE:
2109 if (acpi_device_should_be_hidden(handle))
2113 acpi_mipi_check_crs_csi2(handle);
2115 /* Bail out if there are dependencies. */
2116 if (acpi_scan_check_dep(handle) > 0) {
2118 * The entire CSI-2 connection graph needs to be
2119 * extracted before any drivers or scan handlers
2120 * are bound to struct device objects, so scan
2121 * _CRS CSI-2 resource descriptors for all
2122 * devices below the current handle.
2124 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
2126 acpi_scan_check_crs_csi2_cb,
2128 return AE_CTRL_DEPTH;
2133 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
2134 type = ACPI_BUS_TYPE_DEVICE;
2137 case ACPI_TYPE_PROCESSOR:
2138 type = ACPI_BUS_TYPE_PROCESSOR;
2141 case ACPI_TYPE_THERMAL:
2142 type = ACPI_BUS_TYPE_THERMAL;
2145 case ACPI_TYPE_POWER:
2146 acpi_add_power_resource(handle);
2153 * If first_pass is true at this point, the device has no dependencies,
2154 * or the creation of the device object would have been postponed above.
2156 acpi_add_single_object(&device, handle, type, !first_pass);
2158 return AE_CTRL_DEPTH;
2160 acpi_scan_init_hotplug(device);
2169 static acpi_status acpi_bus_check_add_1(acpi_handle handle, u32 lvl_not_used,
2170 void *not_used, void **ret_p)
2172 return acpi_bus_check_add(handle, true, (struct acpi_device **)ret_p);
2175 static acpi_status acpi_bus_check_add_2(acpi_handle handle, u32 lvl_not_used,
2176 void *not_used, void **ret_p)
2178 return acpi_bus_check_add(handle, false, (struct acpi_device **)ret_p);
2181 static void acpi_default_enumeration(struct acpi_device *device)
2184 * Do not enumerate devices with enumeration_by_parent flag set as
2185 * they will be enumerated by their respective parents.
2187 if (!device->flags.enumeration_by_parent) {
2188 acpi_create_platform_device(device, NULL);
2189 acpi_device_set_enumerated(device);
2191 blocking_notifier_call_chain(&acpi_reconfig_chain,
2192 ACPI_RECONFIG_DEVICE_ADD, device);
2196 static const struct acpi_device_id generic_device_ids[] = {
2197 {ACPI_DT_NAMESPACE_HID, },
2201 static int acpi_generic_device_attach(struct acpi_device *adev,
2202 const struct acpi_device_id *not_used)
2205 * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
2206 * below can be unconditional.
2208 if (adev->data.of_compatible)
2209 acpi_default_enumeration(adev);
2214 static struct acpi_scan_handler generic_device_handler = {
2215 .ids = generic_device_ids,
2216 .attach = acpi_generic_device_attach,
2219 static int acpi_scan_attach_handler(struct acpi_device *device)
2221 struct acpi_hardware_id *hwid;
2224 list_for_each_entry(hwid, &device->pnp.ids, list) {
2225 const struct acpi_device_id *devid;
2226 struct acpi_scan_handler *handler;
2228 handler = acpi_scan_match_handler(hwid->id, &devid);
2230 if (!handler->attach) {
2231 device->pnp.type.platform_id = 0;
2234 device->handler = handler;
2235 ret = handler->attach(device, devid);
2239 device->handler = NULL;
2248 static int acpi_bus_attach(struct acpi_device *device, void *first_pass)
2250 bool skip = !first_pass && device->flags.visited;
2257 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2258 register_dock_dependent_device(device, ejd);
2260 acpi_bus_get_status(device);
2261 /* Skip devices that are not ready for enumeration (e.g. not present) */
2262 if (!acpi_dev_ready_for_enumeration(device)) {
2263 device->flags.initialized = false;
2264 acpi_device_clear_enumerated(device);
2265 device->flags.power_manageable = 0;
2268 if (device->handler)
2271 if (!device->flags.initialized) {
2272 device->flags.power_manageable =
2273 device->power.states[ACPI_STATE_D0].flags.valid;
2274 if (acpi_bus_init_power(device))
2275 device->flags.power_manageable = 0;
2277 device->flags.initialized = true;
2278 } else if (device->flags.visited) {
2282 ret = acpi_scan_attach_handler(device);
2286 device->flags.match_driver = true;
2287 if (ret > 0 && !device->flags.enumeration_by_parent) {
2288 acpi_device_set_enumerated(device);
2292 ret = device_attach(&device->dev);
2296 if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
2297 acpi_default_enumeration(device);
2299 acpi_device_set_enumerated(device);
2302 acpi_dev_for_each_child(device, acpi_bus_attach, first_pass);
2304 if (!skip && device->handler && device->handler->hotplug.notify_online)
2305 device->handler->hotplug.notify_online(device);
2310 static int acpi_dev_get_next_consumer_dev_cb(struct acpi_dep_data *dep, void *data)
2312 struct acpi_device **adev_p = data;
2313 struct acpi_device *adev = *adev_p;
2316 * If we're passed a 'previous' consumer device then we need to skip
2317 * any consumers until we meet the previous one, and then NULL @data
2318 * so the next one can be returned.
2321 if (dep->consumer == adev->handle)
2327 adev = acpi_get_acpi_dev(dep->consumer);
2329 *(struct acpi_device **)data = adev;
2332 /* Continue parsing if the device object is not present. */
2336 struct acpi_scan_clear_dep_work {
2337 struct work_struct work;
2338 struct acpi_device *adev;
2341 static void acpi_scan_clear_dep_fn(struct work_struct *work)
2343 struct acpi_scan_clear_dep_work *cdw;
2345 cdw = container_of(work, struct acpi_scan_clear_dep_work, work);
2347 acpi_scan_lock_acquire();
2348 acpi_bus_attach(cdw->adev, (void *)true);
2349 acpi_scan_lock_release();
2351 acpi_dev_put(cdw->adev);
2355 static bool acpi_scan_clear_dep_queue(struct acpi_device *adev)
2357 struct acpi_scan_clear_dep_work *cdw;
2359 if (adev->dep_unmet)
2362 cdw = kmalloc(sizeof(*cdw), GFP_KERNEL);
2367 INIT_WORK(&cdw->work, acpi_scan_clear_dep_fn);
2369 * Since the work function may block on the lock until the entire
2370 * initial enumeration of devices is complete, put it into the unbound
2373 queue_work(system_unbound_wq, &cdw->work);
2378 static void acpi_scan_delete_dep_data(struct acpi_dep_data *dep)
2380 list_del(&dep->node);
2384 static int acpi_scan_clear_dep(struct acpi_dep_data *dep, void *data)
2386 struct acpi_device *adev = acpi_get_acpi_dev(dep->consumer);
2390 if (!acpi_scan_clear_dep_queue(adev))
2394 if (dep->free_when_met)
2395 acpi_scan_delete_dep_data(dep);
2403 * acpi_walk_dep_device_list - Apply a callback to every entry in acpi_dep_list
2404 * @handle: The ACPI handle of the supplier device
2405 * @callback: Pointer to the callback function to apply
2406 * @data: Pointer to some data to pass to the callback
2408 * The return value of the callback determines this function's behaviour. If 0
2409 * is returned we continue to iterate over acpi_dep_list. If a positive value
2410 * is returned then the loop is broken but this function returns 0. If a
2411 * negative value is returned by the callback then the loop is broken and that
2412 * value is returned as the final error.
2414 static int acpi_walk_dep_device_list(acpi_handle handle,
2415 int (*callback)(struct acpi_dep_data *, void *),
2418 struct acpi_dep_data *dep, *tmp;
2421 mutex_lock(&acpi_dep_list_lock);
2422 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2423 if (dep->supplier == handle) {
2424 ret = callback(dep, data);
2429 mutex_unlock(&acpi_dep_list_lock);
2431 return ret > 0 ? 0 : ret;
2435 * acpi_dev_clear_dependencies - Inform consumers that the device is now active
2436 * @supplier: Pointer to the supplier &struct acpi_device
2438 * Clear dependencies on the given device.
2440 void acpi_dev_clear_dependencies(struct acpi_device *supplier)
2442 acpi_walk_dep_device_list(supplier->handle, acpi_scan_clear_dep, NULL);
2444 EXPORT_SYMBOL_GPL(acpi_dev_clear_dependencies);
2447 * acpi_dev_ready_for_enumeration - Check if the ACPI device is ready for enumeration
2448 * @device: Pointer to the &struct acpi_device to check
2450 * Check if the device is present and has no unmet dependencies.
2452 * Return true if the device is ready for enumeratino. Otherwise, return false.
2454 bool acpi_dev_ready_for_enumeration(const struct acpi_device *device)
2456 if (device->flags.honor_deps && device->dep_unmet)
2459 return acpi_device_is_present(device);
2461 EXPORT_SYMBOL_GPL(acpi_dev_ready_for_enumeration);
2464 * acpi_dev_get_next_consumer_dev - Return the next adev dependent on @supplier
2465 * @supplier: Pointer to the dependee device
2466 * @start: Pointer to the current dependent device
2468 * Returns the next &struct acpi_device which declares itself dependent on
2469 * @supplier via the _DEP buffer, parsed from the acpi_dep_list.
2471 * If the returned adev is not passed as @start to this function, the caller is
2472 * responsible for putting the reference to adev when it is no longer needed.
2474 struct acpi_device *acpi_dev_get_next_consumer_dev(struct acpi_device *supplier,
2475 struct acpi_device *start)
2477 struct acpi_device *adev = start;
2479 acpi_walk_dep_device_list(supplier->handle,
2480 acpi_dev_get_next_consumer_dev_cb, &adev);
2482 acpi_dev_put(start);
2489 EXPORT_SYMBOL_GPL(acpi_dev_get_next_consumer_dev);
2491 static void acpi_scan_postponed_branch(acpi_handle handle)
2493 struct acpi_device *adev = NULL;
2495 if (ACPI_FAILURE(acpi_bus_check_add(handle, false, &adev)))
2498 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2499 acpi_bus_check_add_2, NULL, NULL, (void **)&adev);
2502 * Populate the ACPI _CRS CSI-2 software nodes for the ACPI devices that
2503 * have been added above.
2505 acpi_mipi_init_crs_csi2_swnodes();
2507 acpi_bus_attach(adev, NULL);
2510 static void acpi_scan_postponed(void)
2512 struct acpi_dep_data *dep, *tmp;
2514 mutex_lock(&acpi_dep_list_lock);
2516 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2517 acpi_handle handle = dep->consumer;
2520 * In case there are multiple acpi_dep_list entries with the
2521 * same consumer, skip the current entry if the consumer device
2522 * object corresponding to it is present already.
2524 if (!acpi_fetch_acpi_dev(handle)) {
2526 * Even though the lock is released here, tmp is
2527 * guaranteed to be valid, because none of the list
2528 * entries following dep is marked as "free when met"
2529 * and so they cannot be deleted.
2531 mutex_unlock(&acpi_dep_list_lock);
2533 acpi_scan_postponed_branch(handle);
2535 mutex_lock(&acpi_dep_list_lock);
2539 acpi_scan_delete_dep_data(dep);
2541 dep->free_when_met = true;
2544 mutex_unlock(&acpi_dep_list_lock);
2548 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2549 * @handle: Root of the namespace scope to scan.
2551 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2554 * If no devices were found, -ENODEV is returned, but it does not mean that
2555 * there has been a real error. There just have been no suitable ACPI objects
2556 * in the table trunk from which the kernel could create a device and add an
2557 * appropriate driver.
2559 * Must be called under acpi_scan_lock.
2561 int acpi_bus_scan(acpi_handle handle)
2563 struct acpi_device *device = NULL;
2565 /* Pass 1: Avoid enumerating devices with missing dependencies. */
2567 if (ACPI_SUCCESS(acpi_bus_check_add(handle, true, &device)))
2568 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2569 acpi_bus_check_add_1, NULL, NULL,
2576 * Set up ACPI _CRS CSI-2 software nodes using information extracted
2577 * from the _CRS CSI-2 resource descriptors during the ACPI namespace
2578 * walk above and MIPI DisCo for Imaging device properties.
2580 acpi_mipi_scan_crs_csi2();
2581 acpi_mipi_init_crs_csi2_swnodes();
2583 acpi_bus_attach(device, (void *)true);
2585 /* Pass 2: Enumerate all of the remaining devices. */
2587 acpi_scan_postponed();
2589 acpi_mipi_crs_csi2_cleanup();
2593 EXPORT_SYMBOL(acpi_bus_scan);
2596 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2597 * @adev: Root of the ACPI namespace scope to walk.
2599 * Must be called under acpi_scan_lock.
2601 void acpi_bus_trim(struct acpi_device *adev)
2603 acpi_scan_check_and_detach(adev, NULL);
2605 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2607 int acpi_bus_register_early_device(int type)
2609 struct acpi_device *device = NULL;
2612 result = acpi_add_single_object(&device, NULL, type, false);
2616 device->flags.match_driver = true;
2617 return device_attach(&device->dev);
2619 EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
2621 static void acpi_bus_scan_fixed(void)
2623 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2624 struct acpi_device *adev = NULL;
2626 acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_POWER_BUTTON,
2629 adev->flags.match_driver = true;
2630 if (device_attach(&adev->dev) >= 0)
2631 device_init_wakeup(&adev->dev, true);
2633 dev_dbg(&adev->dev, "No driver\n");
2637 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2638 struct acpi_device *adev = NULL;
2640 acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_SLEEP_BUTTON,
2643 adev->flags.match_driver = true;
2644 if (device_attach(&adev->dev) < 0)
2645 dev_dbg(&adev->dev, "No driver\n");
2650 static void __init acpi_get_spcr_uart_addr(void)
2653 struct acpi_table_spcr *spcr_ptr;
2655 status = acpi_get_table(ACPI_SIG_SPCR, 0,
2656 (struct acpi_table_header **)&spcr_ptr);
2657 if (ACPI_FAILURE(status)) {
2658 pr_warn("STAO table present, but SPCR is missing\n");
2662 spcr_uart_addr = spcr_ptr->serial_port.address;
2663 acpi_put_table((struct acpi_table_header *)spcr_ptr);
2666 static bool acpi_scan_initialized;
2668 void __init acpi_scan_init(void)
2671 struct acpi_table_stao *stao_ptr;
2673 acpi_pci_root_init();
2674 acpi_pci_link_init();
2675 acpi_processor_init();
2676 acpi_platform_init();
2679 acpi_cmos_rtc_init();
2680 acpi_container_init();
2681 acpi_memory_hotplug_init();
2682 acpi_watchdog_init();
2684 acpi_int340x_thermal_init();
2687 acpi_scan_add_handler(&generic_device_handler);
2690 * If there is STAO table, check whether it needs to ignore the UART
2691 * device in SPCR table.
2693 status = acpi_get_table(ACPI_SIG_STAO, 0,
2694 (struct acpi_table_header **)&stao_ptr);
2695 if (ACPI_SUCCESS(status)) {
2696 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2697 pr_info("STAO Name List not yet supported.\n");
2699 if (stao_ptr->ignore_uart)
2700 acpi_get_spcr_uart_addr();
2702 acpi_put_table((struct acpi_table_header *)stao_ptr);
2705 acpi_gpe_apply_masked_gpes();
2706 acpi_update_all_gpes();
2709 * Although we call __add_memory() that is documented to require the
2710 * device_hotplug_lock, it is not necessary here because this is an
2711 * early code when userspace or any other code path cannot trigger
2712 * hotplug/hotunplug operations.
2714 mutex_lock(&acpi_scan_lock);
2716 * Enumerate devices in the ACPI namespace.
2718 if (acpi_bus_scan(ACPI_ROOT_OBJECT))
2721 acpi_root = acpi_fetch_acpi_dev(ACPI_ROOT_OBJECT);
2725 /* Fixed feature devices do not exist on HW-reduced platform */
2726 if (!acpi_gbl_reduced_hardware)
2727 acpi_bus_scan_fixed();
2729 acpi_turn_off_unused_power_resources();
2731 acpi_scan_initialized = true;
2734 mutex_unlock(&acpi_scan_lock);
2737 static struct acpi_probe_entry *ape;
2738 static int acpi_probe_count;
2739 static DEFINE_MUTEX(acpi_probe_mutex);
2741 static int __init acpi_match_madt(union acpi_subtable_headers *header,
2742 const unsigned long end)
2744 if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape))
2745 if (!ape->probe_subtbl(header, end))
2751 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2758 mutex_lock(&acpi_probe_mutex);
2759 for (ape = ap_head; nr; ape++, nr--) {
2760 if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) {
2761 acpi_probe_count = 0;
2762 acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2763 count += acpi_probe_count;
2766 res = acpi_table_parse(ape->id, ape->probe_table);
2771 mutex_unlock(&acpi_probe_mutex);
2776 static void acpi_table_events_fn(struct work_struct *work)
2778 acpi_scan_lock_acquire();
2779 acpi_bus_scan(ACPI_ROOT_OBJECT);
2780 acpi_scan_lock_release();
2785 void acpi_scan_table_notify(void)
2787 struct work_struct *work;
2789 if (!acpi_scan_initialized)
2792 work = kmalloc(sizeof(*work), GFP_KERNEL);
2796 INIT_WORK(work, acpi_table_events_fn);
2797 schedule_work(work);
2800 int acpi_reconfig_notifier_register(struct notifier_block *nb)
2802 return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2804 EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2806 int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2808 return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2810 EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);