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 acpi_hp_notify notify, acpi_hp_uevent uevent)
78 acpi_lock_hp_context();
81 acpi_set_hp_context(adev, hp);
82 acpi_unlock_hp_context();
84 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
86 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
91 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
95 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
96 const char *hotplug_profile_name)
100 error = acpi_scan_add_handler(handler);
104 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
108 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
110 struct acpi_device_physical_node *pn;
112 char *envp[] = { "EVENT=offline", NULL };
115 * acpi_container_offline() calls this for all of the container's
116 * children under the container's physical_node_lock lock.
118 mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
120 list_for_each_entry(pn, &adev->physical_node_list, node)
121 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
123 kobject_uevent_env(&pn->dev->kobj, KOBJ_CHANGE, envp);
129 mutex_unlock(&adev->physical_node_lock);
133 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
136 struct acpi_device *device = acpi_fetch_acpi_dev(handle);
137 struct acpi_device_physical_node *pn;
138 bool second_pass = (bool)data;
139 acpi_status status = AE_OK;
144 if (device->handler && !device->handler->hotplug.enabled) {
145 *ret_p = &device->dev;
149 mutex_lock(&device->physical_node_lock);
151 list_for_each_entry(pn, &device->physical_node_list, node) {
155 /* Skip devices offlined by the first pass. */
159 pn->put_online = false;
161 ret = device_offline(pn->dev);
163 pn->put_online = !ret;
173 mutex_unlock(&device->physical_node_lock);
178 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
181 struct acpi_device *device = acpi_fetch_acpi_dev(handle);
182 struct acpi_device_physical_node *pn;
187 mutex_lock(&device->physical_node_lock);
189 list_for_each_entry(pn, &device->physical_node_list, node)
190 if (pn->put_online) {
191 device_online(pn->dev);
192 pn->put_online = false;
195 mutex_unlock(&device->physical_node_lock);
200 static int acpi_scan_try_to_offline(struct acpi_device *device)
202 acpi_handle handle = device->handle;
203 struct device *errdev = NULL;
207 * Carry out two passes here and ignore errors in the first pass,
208 * because if the devices in question are memory blocks and
209 * CONFIG_MEMCG is set, one of the blocks may hold data structures
210 * that the other blocks depend on, but it is not known in advance which
213 * If the first pass is successful, the second one isn't needed, though.
215 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
216 NULL, acpi_bus_offline, (void *)false,
218 if (status == AE_SUPPORT) {
219 dev_warn(errdev, "Offline disabled.\n");
220 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
221 acpi_bus_online, NULL, NULL, NULL);
224 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
227 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
228 NULL, acpi_bus_offline, (void *)true,
231 acpi_bus_offline(handle, 0, (void *)true,
235 dev_warn(errdev, "Offline failed.\n");
236 acpi_bus_online(handle, 0, NULL, NULL);
237 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
238 ACPI_UINT32_MAX, acpi_bus_online,
246 static int acpi_scan_check_and_detach(struct acpi_device *adev, void *check)
248 struct acpi_scan_handler *handler = adev->handler;
250 acpi_dev_for_each_child_reverse(adev, acpi_scan_check_and_detach, check);
253 acpi_bus_get_status(adev);
255 * Skip devices that are still there and take the enabled
258 if (acpi_device_is_enabled(adev))
261 /* Skip device that have not been enumerated. */
262 if (!acpi_device_enumerated(adev)) {
263 dev_dbg(&adev->dev, "Still not enumerated\n");
268 adev->flags.match_driver = false;
271 handler->detach(adev);
273 adev->handler = NULL;
275 device_release_driver(&adev->dev);
278 * Most likely, the device is going away, so put it into D3cold before
281 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
282 adev->flags.initialized = false;
283 acpi_device_clear_enumerated(adev);
288 static void acpi_scan_check_subtree(struct acpi_device *adev)
290 acpi_scan_check_and_detach(adev, (void *)true);
293 static int acpi_scan_hot_remove(struct acpi_device *device)
295 acpi_handle handle = device->handle;
296 unsigned long long sta;
299 if (device->handler && device->handler->hotplug.demand_offline) {
300 if (!acpi_scan_is_offline(device, true))
303 int error = acpi_scan_try_to_offline(device);
308 acpi_handle_debug(handle, "Ejecting\n");
310 acpi_bus_trim(device);
312 acpi_evaluate_lck(handle, 0);
316 status = acpi_evaluate_ej0(handle);
317 if (status == AE_NOT_FOUND)
319 else if (ACPI_FAILURE(status))
323 * Verify if eject was indeed successful. If not, log an error
324 * message. No need to call _OST since _EJ0 call was made OK.
326 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
327 if (ACPI_FAILURE(status)) {
328 acpi_handle_warn(handle,
329 "Status check after eject failed (0x%x)\n", status);
330 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
331 acpi_handle_warn(handle,
332 "Eject incomplete - status 0x%llx\n", sta);
338 static int acpi_scan_rescan_bus(struct acpi_device *adev)
340 struct acpi_scan_handler *handler = adev->handler;
343 if (handler && handler->hotplug.scan_dependent)
344 ret = handler->hotplug.scan_dependent(adev);
346 ret = acpi_bus_scan(adev->handle);
349 dev_info(&adev->dev, "Namespace scan failure\n");
354 static int acpi_scan_device_check(struct acpi_device *adev)
356 struct acpi_device *parent;
358 acpi_scan_check_subtree(adev);
360 if (!acpi_device_is_present(adev))
364 * This function is only called for device objects for which matching
365 * scan handlers exist. The only situation in which the scan handler
366 * is not attached to this device object yet is when the device has
367 * just appeared (either it wasn't present at all before or it was
368 * removed and then added again).
371 dev_dbg(&adev->dev, "Already enumerated\n");
375 parent = acpi_dev_parent(adev);
379 return acpi_scan_rescan_bus(parent);
382 static int acpi_scan_bus_check(struct acpi_device *adev)
384 acpi_scan_check_subtree(adev);
386 return acpi_scan_rescan_bus(adev);
389 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
392 case ACPI_NOTIFY_BUS_CHECK:
393 return acpi_scan_bus_check(adev);
394 case ACPI_NOTIFY_DEVICE_CHECK:
395 return acpi_scan_device_check(adev);
396 case ACPI_NOTIFY_EJECT_REQUEST:
397 case ACPI_OST_EC_OSPM_EJECT:
398 if (adev->handler && !adev->handler->hotplug.enabled) {
399 dev_info(&adev->dev, "Eject disabled\n");
402 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
403 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
404 return acpi_scan_hot_remove(adev);
409 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
411 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
414 lock_device_hotplug();
415 mutex_lock(&acpi_scan_lock);
418 * The device object's ACPI handle cannot become invalid as long as we
419 * are holding acpi_scan_lock, but it might have become invalid before
420 * that lock was acquired.
422 if (adev->handle == INVALID_ACPI_HANDLE)
425 if (adev->flags.is_dock_station) {
426 error = dock_notify(adev, src);
427 } else if (adev->flags.hotplug_notify) {
428 error = acpi_generic_hotplug_event(adev, src);
430 acpi_hp_notify notify;
432 acpi_lock_hp_context();
433 notify = adev->hp ? adev->hp->notify : NULL;
434 acpi_unlock_hp_context();
436 * There may be additional notify handlers for device objects
437 * without the .event() callback, so ignore them here.
440 error = notify(adev, src);
446 ost_code = ACPI_OST_SC_SUCCESS;
449 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
452 ost_code = ACPI_OST_SC_DEVICE_BUSY;
455 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
460 acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
463 acpi_put_acpi_dev(adev);
464 mutex_unlock(&acpi_scan_lock);
465 unlock_device_hotplug();
468 static void acpi_free_power_resources_lists(struct acpi_device *device)
472 if (device->wakeup.flags.valid)
473 acpi_power_resources_list_free(&device->wakeup.resources);
475 if (!device->power.flags.power_resources)
478 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
479 struct acpi_device_power_state *ps = &device->power.states[i];
480 acpi_power_resources_list_free(&ps->resources);
484 static void acpi_device_release(struct device *dev)
486 struct acpi_device *acpi_dev = to_acpi_device(dev);
488 acpi_free_properties(acpi_dev);
489 acpi_free_pnp_ids(&acpi_dev->pnp);
490 acpi_free_power_resources_lists(acpi_dev);
494 static void acpi_device_del(struct acpi_device *device)
496 struct acpi_device_bus_id *acpi_device_bus_id;
498 mutex_lock(&acpi_device_lock);
500 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
501 if (!strcmp(acpi_device_bus_id->bus_id,
502 acpi_device_hid(device))) {
503 ida_free(&acpi_device_bus_id->instance_ida,
504 device->pnp.instance_no);
505 if (ida_is_empty(&acpi_device_bus_id->instance_ida)) {
506 list_del(&acpi_device_bus_id->node);
507 kfree_const(acpi_device_bus_id->bus_id);
508 kfree(acpi_device_bus_id);
513 list_del(&device->wakeup_list);
515 mutex_unlock(&acpi_device_lock);
517 acpi_power_add_remove_device(device, false);
518 acpi_device_remove_files(device);
520 device->remove(device);
522 device_del(&device->dev);
525 static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
527 static LIST_HEAD(acpi_device_del_list);
528 static DEFINE_MUTEX(acpi_device_del_lock);
530 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
533 struct acpi_device *adev;
535 mutex_lock(&acpi_device_del_lock);
537 if (list_empty(&acpi_device_del_list)) {
538 mutex_unlock(&acpi_device_del_lock);
541 adev = list_first_entry(&acpi_device_del_list,
542 struct acpi_device, del_list);
543 list_del(&adev->del_list);
545 mutex_unlock(&acpi_device_del_lock);
547 blocking_notifier_call_chain(&acpi_reconfig_chain,
548 ACPI_RECONFIG_DEVICE_REMOVE, adev);
550 acpi_device_del(adev);
552 * Drop references to all power resources that might have been
553 * used by the device.
555 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
561 * acpi_scan_drop_device - Drop an ACPI device object.
562 * @handle: Handle of an ACPI namespace node, not used.
563 * @context: Address of the ACPI device object to drop.
565 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
566 * namespace node the device object pointed to by @context is attached to.
568 * The unregistration is carried out asynchronously to avoid running
569 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
570 * ensure the correct ordering (the device objects must be unregistered in the
571 * same order in which the corresponding namespace nodes are deleted).
573 static void acpi_scan_drop_device(acpi_handle handle, void *context)
575 static DECLARE_WORK(work, acpi_device_del_work_fn);
576 struct acpi_device *adev = context;
578 mutex_lock(&acpi_device_del_lock);
581 * Use the ACPI hotplug workqueue which is ordered, so this work item
582 * won't run after any hotplug work items submitted subsequently. That
583 * prevents attempts to register device objects identical to those being
584 * deleted from happening concurrently (such attempts result from
585 * hotplug events handled via the ACPI hotplug workqueue). It also will
586 * run after all of the work items submitted previously, which helps
587 * those work items to ensure that they are not accessing stale device
590 if (list_empty(&acpi_device_del_list))
591 acpi_queue_hotplug_work(&work);
593 list_add_tail(&adev->del_list, &acpi_device_del_list);
594 /* Make acpi_ns_validate_handle() return NULL for this handle. */
595 adev->handle = INVALID_ACPI_HANDLE;
597 mutex_unlock(&acpi_device_del_lock);
600 static struct acpi_device *handle_to_device(acpi_handle handle,
601 void (*callback)(void *))
603 struct acpi_device *adev = NULL;
606 status = acpi_get_data_full(handle, acpi_scan_drop_device,
607 (void **)&adev, callback);
608 if (ACPI_FAILURE(status) || !adev) {
609 acpi_handle_debug(handle, "No context!\n");
616 * acpi_fetch_acpi_dev - Retrieve ACPI device object.
617 * @handle: ACPI handle associated with the requested ACPI device object.
619 * Return a pointer to the ACPI device object associated with @handle, if
620 * present, or NULL otherwise.
622 struct acpi_device *acpi_fetch_acpi_dev(acpi_handle handle)
624 return handle_to_device(handle, NULL);
626 EXPORT_SYMBOL_GPL(acpi_fetch_acpi_dev);
628 static void get_acpi_device(void *dev)
634 * acpi_get_acpi_dev - Retrieve ACPI device object and reference count it.
635 * @handle: ACPI handle associated with the requested ACPI device object.
637 * Return a pointer to the ACPI device object associated with @handle and bump
638 * up that object's reference counter (under the ACPI Namespace lock), if
639 * present, or return NULL otherwise.
641 * The ACPI device object reference acquired by this function needs to be
642 * dropped via acpi_dev_put().
644 struct acpi_device *acpi_get_acpi_dev(acpi_handle handle)
646 return handle_to_device(handle, get_acpi_device);
648 EXPORT_SYMBOL_GPL(acpi_get_acpi_dev);
650 static struct acpi_device_bus_id *acpi_device_bus_id_match(const char *dev_id)
652 struct acpi_device_bus_id *acpi_device_bus_id;
654 /* Find suitable bus_id and instance number in acpi_bus_id_list. */
655 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
656 if (!strcmp(acpi_device_bus_id->bus_id, dev_id))
657 return acpi_device_bus_id;
662 static int acpi_device_set_name(struct acpi_device *device,
663 struct acpi_device_bus_id *acpi_device_bus_id)
665 struct ida *instance_ida = &acpi_device_bus_id->instance_ida;
668 result = ida_alloc(instance_ida, GFP_KERNEL);
672 device->pnp.instance_no = result;
673 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, result);
677 int acpi_tie_acpi_dev(struct acpi_device *adev)
679 acpi_handle handle = adev->handle;
685 status = acpi_attach_data(handle, acpi_scan_drop_device, adev);
686 if (ACPI_FAILURE(status)) {
687 acpi_handle_err(handle, "Unable to attach device data\n");
694 static void acpi_store_pld_crc(struct acpi_device *adev)
696 struct acpi_pld_info *pld;
699 status = acpi_get_physical_device_location(adev->handle, &pld);
700 if (ACPI_FAILURE(status))
703 adev->pld_crc = crc32(~0, pld, sizeof(*pld));
707 int acpi_device_add(struct acpi_device *device)
709 struct acpi_device_bus_id *acpi_device_bus_id;
715 * Link this device to its parent and siblings.
717 INIT_LIST_HEAD(&device->wakeup_list);
718 INIT_LIST_HEAD(&device->physical_node_list);
719 INIT_LIST_HEAD(&device->del_list);
720 mutex_init(&device->physical_node_lock);
722 mutex_lock(&acpi_device_lock);
724 acpi_device_bus_id = acpi_device_bus_id_match(acpi_device_hid(device));
725 if (acpi_device_bus_id) {
726 result = acpi_device_set_name(device, acpi_device_bus_id);
730 acpi_device_bus_id = kzalloc(sizeof(*acpi_device_bus_id),
732 if (!acpi_device_bus_id) {
736 acpi_device_bus_id->bus_id =
737 kstrdup_const(acpi_device_hid(device), GFP_KERNEL);
738 if (!acpi_device_bus_id->bus_id) {
739 kfree(acpi_device_bus_id);
744 ida_init(&acpi_device_bus_id->instance_ida);
746 result = acpi_device_set_name(device, acpi_device_bus_id);
748 kfree_const(acpi_device_bus_id->bus_id);
749 kfree(acpi_device_bus_id);
753 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
756 if (device->wakeup.flags.valid)
757 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
759 acpi_store_pld_crc(device);
761 mutex_unlock(&acpi_device_lock);
763 result = device_add(&device->dev);
765 dev_err(&device->dev, "Error registering device\n");
769 result = acpi_device_setup_files(device);
771 pr_err("Error creating sysfs interface for device %s\n",
772 dev_name(&device->dev));
777 mutex_lock(&acpi_device_lock);
779 list_del(&device->wakeup_list);
782 mutex_unlock(&acpi_device_lock);
784 acpi_detach_data(device->handle, acpi_scan_drop_device);
789 /* --------------------------------------------------------------------------
791 -------------------------------------------------------------------------- */
792 static bool acpi_info_matches_ids(struct acpi_device_info *info,
793 const char * const ids[])
795 struct acpi_pnp_device_id_list *cid_list = NULL;
798 if (!(info->valid & ACPI_VALID_HID))
801 index = match_string(ids, -1, info->hardware_id.string);
805 if (info->valid & ACPI_VALID_CID)
806 cid_list = &info->compatible_id_list;
811 for (i = 0; i < cid_list->count; i++) {
812 index = match_string(ids, -1, cid_list->ids[i].string);
820 /* List of HIDs for which we ignore matching ACPI devices, when checking _DEP lists. */
821 static const char * const acpi_ignore_dep_ids[] = {
822 "PNP0D80", /* Windows-compatible System Power Management Controller */
823 "INT33BD", /* Intel Baytrail Mailbox Device */
824 "LATT2021", /* Lattice FW Update Client Driver */
828 /* List of HIDs for which we honor deps of matching ACPI devs, when checking _DEP lists. */
829 static const char * const acpi_honor_dep_ids[] = {
830 "INT3472", /* Camera sensor PMIC / clk and regulator info */
831 "INTC1059", /* IVSC (TGL) driver must be loaded to allow i2c access to camera sensors */
832 "INTC1095", /* IVSC (ADL) driver must be loaded to allow i2c access to camera sensors */
833 "INTC100A", /* IVSC (RPL) driver must be loaded to allow i2c access to camera sensors */
834 "INTC10CF", /* IVSC (MTL) driver must be loaded to allow i2c access to camera sensors */
838 static struct acpi_device *acpi_find_parent_acpi_dev(acpi_handle handle)
840 struct acpi_device *adev;
843 * Fixed hardware devices do not appear in the namespace and do not
844 * have handles, but we fabricate acpi_devices for them, so we have
845 * to deal with them specially.
853 status = acpi_get_parent(handle, &handle);
854 if (ACPI_FAILURE(status)) {
855 if (status != AE_NULL_ENTRY)
860 adev = acpi_fetch_acpi_dev(handle);
866 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
870 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
871 union acpi_object *obj;
873 status = acpi_get_handle(handle, "_EJD", &tmp);
874 if (ACPI_FAILURE(status))
877 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
878 if (ACPI_SUCCESS(status)) {
879 obj = buffer.pointer;
880 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
882 kfree(buffer.pointer);
886 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
888 static int acpi_bus_extract_wakeup_device_power_package(struct acpi_device *dev)
890 acpi_handle handle = dev->handle;
891 struct acpi_device_wakeup *wakeup = &dev->wakeup;
892 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
893 union acpi_object *package = NULL;
894 union acpi_object *element = NULL;
898 INIT_LIST_HEAD(&wakeup->resources);
901 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
902 if (ACPI_FAILURE(status)) {
903 acpi_handle_info(handle, "_PRW evaluation failed: %s\n",
904 acpi_format_exception(status));
908 package = (union acpi_object *)buffer.pointer;
910 if (!package || package->package.count < 2)
913 element = &(package->package.elements[0]);
917 if (element->type == ACPI_TYPE_PACKAGE) {
918 if ((element->package.count < 2) ||
919 (element->package.elements[0].type !=
920 ACPI_TYPE_LOCAL_REFERENCE)
921 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
925 element->package.elements[0].reference.handle;
927 (u32) element->package.elements[1].integer.value;
928 } else if (element->type == ACPI_TYPE_INTEGER) {
929 wakeup->gpe_device = NULL;
930 wakeup->gpe_number = element->integer.value;
935 element = &(package->package.elements[1]);
936 if (element->type != ACPI_TYPE_INTEGER)
939 wakeup->sleep_state = element->integer.value;
941 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
945 if (!list_empty(&wakeup->resources)) {
948 err = acpi_power_wakeup_list_init(&wakeup->resources,
951 acpi_handle_warn(handle, "Retrieving current states "
952 "of wakeup power resources failed\n");
953 acpi_power_resources_list_free(&wakeup->resources);
956 if (sleep_state < wakeup->sleep_state) {
957 acpi_handle_warn(handle, "Overriding _PRW sleep state "
958 "(S%d) by S%d from power resources\n",
959 (int)wakeup->sleep_state, sleep_state);
960 wakeup->sleep_state = sleep_state;
965 kfree(buffer.pointer);
969 /* Do not use a button for S5 wakeup */
970 #define ACPI_AVOID_WAKE_FROM_S5 BIT(0)
972 static bool acpi_wakeup_gpe_init(struct acpi_device *device)
974 static const struct acpi_device_id button_device_ids[] = {
975 {"PNP0C0C", 0}, /* Power button */
976 {"PNP0C0D", ACPI_AVOID_WAKE_FROM_S5}, /* Lid */
977 {"PNP0C0E", ACPI_AVOID_WAKE_FROM_S5}, /* Sleep button */
980 struct acpi_device_wakeup *wakeup = &device->wakeup;
981 const struct acpi_device_id *match;
984 wakeup->flags.notifier_present = 0;
986 /* Power button, Lid switch always enable wakeup */
987 match = acpi_match_acpi_device(button_device_ids, device);
989 if ((match->driver_data & ACPI_AVOID_WAKE_FROM_S5) &&
990 wakeup->sleep_state == ACPI_STATE_S5)
991 wakeup->sleep_state = ACPI_STATE_S4;
992 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
993 device_set_wakeup_capable(&device->dev, true);
997 status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
999 return ACPI_SUCCESS(status);
1002 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1006 /* Presence of _PRW indicates wake capable */
1007 if (!acpi_has_method(device->handle, "_PRW"))
1010 err = acpi_bus_extract_wakeup_device_power_package(device);
1012 dev_err(&device->dev, "Unable to extract wakeup power resources");
1016 device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
1017 device->wakeup.prepare_count = 0;
1019 * Call _PSW/_DSW object to disable its ability to wake the sleeping
1020 * system for the ACPI device with the _PRW object.
1021 * The _PSW object is deprecated in ACPI 3.0 and is replaced by _DSW.
1022 * So it is necessary to call _DSW object first. Only when it is not
1023 * present will the _PSW object used.
1025 err = acpi_device_sleep_wake(device, 0, 0, 0);
1027 pr_debug("error in _DSW or _PSW evaluation\n");
1030 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1032 struct acpi_device_power_state *ps = &device->power.states[state];
1033 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1034 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1037 INIT_LIST_HEAD(&ps->resources);
1039 /* Evaluate "_PRx" to get referenced power resources */
1040 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1041 if (ACPI_SUCCESS(status)) {
1042 union acpi_object *package = buffer.pointer;
1044 if (buffer.length && package
1045 && package->type == ACPI_TYPE_PACKAGE
1046 && package->package.count)
1047 acpi_extract_power_resources(package, 0, &ps->resources);
1049 ACPI_FREE(buffer.pointer);
1052 /* Evaluate "_PSx" to see if we can do explicit sets */
1054 if (acpi_has_method(device->handle, pathname))
1055 ps->flags.explicit_set = 1;
1057 /* State is valid if there are means to put the device into it. */
1058 if (!list_empty(&ps->resources) || ps->flags.explicit_set)
1059 ps->flags.valid = 1;
1061 ps->power = -1; /* Unknown - driver assigned */
1062 ps->latency = -1; /* Unknown - driver assigned */
1065 static void acpi_bus_get_power_flags(struct acpi_device *device)
1067 unsigned long long dsc = ACPI_STATE_D0;
1070 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1071 if (!acpi_has_method(device->handle, "_PS0") &&
1072 !acpi_has_method(device->handle, "_PR0"))
1075 device->flags.power_manageable = 1;
1078 * Power Management Flags
1080 if (acpi_has_method(device->handle, "_PSC"))
1081 device->power.flags.explicit_get = 1;
1083 if (acpi_has_method(device->handle, "_IRC"))
1084 device->power.flags.inrush_current = 1;
1086 if (acpi_has_method(device->handle, "_DSW"))
1087 device->power.flags.dsw_present = 1;
1089 acpi_evaluate_integer(device->handle, "_DSC", NULL, &dsc);
1090 device->power.state_for_enumeration = dsc;
1093 * Enumerate supported power management states
1095 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1096 acpi_bus_init_power_state(device, i);
1098 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1100 /* Set the defaults for D0 and D3hot (always supported). */
1101 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1102 device->power.states[ACPI_STATE_D0].power = 100;
1103 device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
1106 * Use power resources only if the D0 list of them is populated, because
1107 * some platforms may provide _PR3 only to indicate D3cold support and
1108 * in those cases the power resources list returned by it may be bogus.
1110 if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) {
1111 device->power.flags.power_resources = 1;
1113 * D3cold is supported if the D3hot list of power resources is
1116 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
1117 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1120 if (acpi_bus_init_power(device))
1121 device->flags.power_manageable = 0;
1124 static void acpi_bus_get_flags(struct acpi_device *device)
1126 /* Presence of _STA indicates 'dynamic_status' */
1127 if (acpi_has_method(device->handle, "_STA"))
1128 device->flags.dynamic_status = 1;
1130 /* Presence of _RMV indicates 'removable' */
1131 if (acpi_has_method(device->handle, "_RMV"))
1132 device->flags.removable = 1;
1134 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1135 if (acpi_has_method(device->handle, "_EJD") ||
1136 acpi_has_method(device->handle, "_EJ0"))
1137 device->flags.ejectable = 1;
1140 static void acpi_device_get_busid(struct acpi_device *device)
1142 char bus_id[5] = { '?', 0 };
1143 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1149 * The device's Bus ID is simply the object name.
1150 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1152 if (!acpi_dev_parent(device)) {
1153 strcpy(device->pnp.bus_id, "ACPI");
1157 switch (device->device_type) {
1158 case ACPI_BUS_TYPE_POWER_BUTTON:
1159 strcpy(device->pnp.bus_id, "PWRF");
1161 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1162 strcpy(device->pnp.bus_id, "SLPF");
1164 case ACPI_BUS_TYPE_ECDT_EC:
1165 strcpy(device->pnp.bus_id, "ECDT");
1168 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1169 /* Clean up trailing underscores (if any) */
1170 for (i = 3; i > 1; i--) {
1171 if (bus_id[i] == '_')
1176 strcpy(device->pnp.bus_id, bus_id);
1182 * acpi_ata_match - see if an acpi object is an ATA device
1184 * If an acpi object has one of the ACPI ATA methods defined,
1185 * then we can safely call it an ATA device.
1187 bool acpi_ata_match(acpi_handle handle)
1189 return acpi_has_method(handle, "_GTF") ||
1190 acpi_has_method(handle, "_GTM") ||
1191 acpi_has_method(handle, "_STM") ||
1192 acpi_has_method(handle, "_SDD");
1196 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1198 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1199 * then we can safely call it an ejectable drive bay
1201 bool acpi_bay_match(acpi_handle handle)
1203 acpi_handle phandle;
1205 if (!acpi_has_method(handle, "_EJ0"))
1207 if (acpi_ata_match(handle))
1209 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1212 return acpi_ata_match(phandle);
1215 bool acpi_device_is_battery(struct acpi_device *adev)
1217 struct acpi_hardware_id *hwid;
1219 list_for_each_entry(hwid, &adev->pnp.ids, list)
1220 if (!strcmp("PNP0C0A", hwid->id))
1226 static bool is_ejectable_bay(struct acpi_device *adev)
1228 acpi_handle handle = adev->handle;
1230 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1233 return acpi_bay_match(handle);
1237 * acpi_dock_match - see if an acpi object has a _DCK method
1239 bool acpi_dock_match(acpi_handle handle)
1241 return acpi_has_method(handle, "_DCK");
1245 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1246 void **return_value)
1248 long *cap = context;
1250 if (acpi_has_method(handle, "_BCM") &&
1251 acpi_has_method(handle, "_BCL")) {
1252 acpi_handle_debug(handle, "Found generic backlight support\n");
1253 *cap |= ACPI_VIDEO_BACKLIGHT;
1254 /* We have backlight support, no need to scan further */
1255 return AE_CTRL_TERMINATE;
1260 /* Returns true if the ACPI object is a video device which can be
1261 * handled by video.ko.
1262 * The device will get a Linux specific CID added in scan.c to
1263 * identify the device as an ACPI graphics device
1264 * Be aware that the graphics device may not be physically present
1265 * Use acpi_video_get_capabilities() to detect general ACPI video
1266 * capabilities of present cards
1268 long acpi_is_video_device(acpi_handle handle)
1270 long video_caps = 0;
1272 /* Is this device able to support video switching ? */
1273 if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1274 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1276 /* Is this device able to retrieve a video ROM ? */
1277 if (acpi_has_method(handle, "_ROM"))
1278 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1280 /* Is this device able to configure which video head to be POSTed ? */
1281 if (acpi_has_method(handle, "_VPO") &&
1282 acpi_has_method(handle, "_GPD") &&
1283 acpi_has_method(handle, "_SPD"))
1284 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1286 /* Only check for backlight functionality if one of the above hit. */
1288 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1289 ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1294 EXPORT_SYMBOL(acpi_is_video_device);
1296 const char *acpi_device_hid(struct acpi_device *device)
1298 struct acpi_hardware_id *hid;
1300 hid = list_first_entry_or_null(&device->pnp.ids, struct acpi_hardware_id, list);
1306 EXPORT_SYMBOL(acpi_device_hid);
1308 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1310 struct acpi_hardware_id *id;
1312 id = kmalloc(sizeof(*id), GFP_KERNEL);
1316 id->id = kstrdup_const(dev_id, GFP_KERNEL);
1322 list_add_tail(&id->list, &pnp->ids);
1323 pnp->type.hardware_id = 1;
1327 * Old IBM workstations have a DSDT bug wherein the SMBus object
1328 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1329 * prefix. Work around this.
1331 static bool acpi_ibm_smbus_match(acpi_handle handle)
1333 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1334 struct acpi_buffer path = { sizeof(node_name), node_name };
1336 if (!dmi_name_in_vendors("IBM"))
1339 /* Look for SMBS object */
1340 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1341 strcmp("SMBS", path.pointer))
1344 /* Does it have the necessary (but misnamed) methods? */
1345 if (acpi_has_method(handle, "SBI") &&
1346 acpi_has_method(handle, "SBR") &&
1347 acpi_has_method(handle, "SBW"))
1353 static bool acpi_object_is_system_bus(acpi_handle handle)
1357 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1360 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1367 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1370 struct acpi_device_info *info = NULL;
1371 struct acpi_pnp_device_id_list *cid_list;
1374 switch (device_type) {
1375 case ACPI_BUS_TYPE_DEVICE:
1376 if (handle == ACPI_ROOT_OBJECT) {
1377 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1381 acpi_get_object_info(handle, &info);
1383 pr_err("%s: Error reading device info\n", __func__);
1387 if (info->valid & ACPI_VALID_HID) {
1388 acpi_add_id(pnp, info->hardware_id.string);
1389 pnp->type.platform_id = 1;
1391 if (info->valid & ACPI_VALID_CID) {
1392 cid_list = &info->compatible_id_list;
1393 for (i = 0; i < cid_list->count; i++)
1394 acpi_add_id(pnp, cid_list->ids[i].string);
1396 if (info->valid & ACPI_VALID_ADR) {
1397 pnp->bus_address = info->address;
1398 pnp->type.bus_address = 1;
1400 if (info->valid & ACPI_VALID_UID)
1401 pnp->unique_id = kstrdup(info->unique_id.string,
1403 if (info->valid & ACPI_VALID_CLS)
1404 acpi_add_id(pnp, info->class_code.string);
1409 * Some devices don't reliably have _HIDs & _CIDs, so add
1410 * synthetic HIDs to make sure drivers can find them.
1412 if (acpi_is_video_device(handle)) {
1413 acpi_add_id(pnp, ACPI_VIDEO_HID);
1414 pnp->type.backlight = 1;
1417 if (acpi_bay_match(handle))
1418 acpi_add_id(pnp, ACPI_BAY_HID);
1419 else if (acpi_dock_match(handle))
1420 acpi_add_id(pnp, ACPI_DOCK_HID);
1421 else if (acpi_ibm_smbus_match(handle))
1422 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1423 else if (list_empty(&pnp->ids) &&
1424 acpi_object_is_system_bus(handle)) {
1425 /* \_SB, \_TZ, LNXSYBUS */
1426 acpi_add_id(pnp, ACPI_BUS_HID);
1427 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1428 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1432 case ACPI_BUS_TYPE_POWER:
1433 acpi_add_id(pnp, ACPI_POWER_HID);
1435 case ACPI_BUS_TYPE_PROCESSOR:
1436 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1438 case ACPI_BUS_TYPE_THERMAL:
1439 acpi_add_id(pnp, ACPI_THERMAL_HID);
1441 case ACPI_BUS_TYPE_POWER_BUTTON:
1442 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1444 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1445 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1447 case ACPI_BUS_TYPE_ECDT_EC:
1448 acpi_add_id(pnp, ACPI_ECDT_HID);
1453 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1455 struct acpi_hardware_id *id, *tmp;
1457 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1458 kfree_const(id->id);
1461 kfree(pnp->unique_id);
1465 * acpi_dma_supported - Check DMA support for the specified device.
1466 * @adev: The pointer to acpi device
1468 * Return false if DMA is not supported. Otherwise, return true
1470 bool acpi_dma_supported(const struct acpi_device *adev)
1475 if (adev->flags.cca_seen)
1479 * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1480 * DMA on "Intel platforms". Presumably that includes all x86 and
1481 * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1483 if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1490 * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1491 * @adev: The pointer to acpi device
1493 * Return enum dev_dma_attr.
1495 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1497 if (!acpi_dma_supported(adev))
1498 return DEV_DMA_NOT_SUPPORTED;
1500 if (adev->flags.coherent_dma)
1501 return DEV_DMA_COHERENT;
1503 return DEV_DMA_NON_COHERENT;
1507 * acpi_dma_get_range() - Get device DMA parameters.
1509 * @dev: device to configure
1510 * @map: pointer to DMA ranges result
1512 * Evaluate DMA regions and return pointer to DMA regions on
1513 * parsing success; it does not update the passed in values on failure.
1515 * Return 0 on success, < 0 on failure.
1517 int acpi_dma_get_range(struct device *dev, const struct bus_dma_region **map)
1519 struct acpi_device *adev;
1521 struct resource_entry *rentry;
1523 struct device *dma_dev = dev;
1524 struct bus_dma_region *r;
1527 * Walk the device tree chasing an ACPI companion with a _DMA
1528 * object while we go. Stop if we find a device with an ACPI
1529 * companion containing a _DMA method.
1532 adev = ACPI_COMPANION(dma_dev);
1533 if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
1536 dma_dev = dma_dev->parent;
1542 if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
1543 acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
1547 ret = acpi_dev_get_dma_resources(adev, &list);
1549 r = kcalloc(ret + 1, sizeof(*r), GFP_KERNEL);
1557 list_for_each_entry(rentry, &list, node) {
1558 if (rentry->res->start >= rentry->res->end) {
1562 dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
1566 r->cpu_start = rentry->res->start;
1567 r->dma_start = rentry->res->start - rentry->offset;
1568 r->size = resource_size(rentry->res);
1573 acpi_dev_free_resource_list(&list);
1575 return ret >= 0 ? 0 : ret;
1578 #ifdef CONFIG_IOMMU_API
1579 int acpi_iommu_fwspec_init(struct device *dev, u32 id,
1580 struct fwnode_handle *fwnode,
1581 const struct iommu_ops *ops)
1585 ret = iommu_fwspec_init(dev, fwnode, ops);
1589 return 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 if (err == -EPROBE_DEFER)
1631 dev_dbg(dev, "Adding to IOMMU failed: %d\n", err);
1634 if (!acpi_iommu_fwspec_ops(dev))
1639 #else /* !CONFIG_IOMMU_API */
1641 int acpi_iommu_fwspec_init(struct device *dev, u32 id,
1642 struct fwnode_handle *fwnode,
1643 const struct iommu_ops *ops)
1648 static int acpi_iommu_configure_id(struct device *dev, const u32 *id_in)
1653 #endif /* !CONFIG_IOMMU_API */
1656 * acpi_dma_configure_id - Set-up DMA configuration for the device.
1657 * @dev: The pointer to the device
1658 * @attr: device dma attributes
1659 * @input_id: input device id const value pointer
1661 int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
1662 const u32 *input_id)
1666 if (attr == DEV_DMA_NOT_SUPPORTED) {
1667 set_dma_ops(dev, &dma_dummy_ops);
1671 acpi_arch_dma_setup(dev);
1673 /* Ignore all other errors apart from EPROBE_DEFER */
1674 ret = acpi_iommu_configure_id(dev, input_id);
1675 if (ret == -EPROBE_DEFER)
1676 return -EPROBE_DEFER;
1678 arch_setup_dma_ops(dev, attr == DEV_DMA_COHERENT);
1682 EXPORT_SYMBOL_GPL(acpi_dma_configure_id);
1684 static void acpi_init_coherency(struct acpi_device *adev)
1686 unsigned long long cca = 0;
1688 struct acpi_device *parent = acpi_dev_parent(adev);
1690 if (parent && parent->flags.cca_seen) {
1692 * From ACPI spec, OSPM will ignore _CCA if an ancestor
1695 adev->flags.cca_seen = 1;
1696 cca = parent->flags.coherent_dma;
1698 status = acpi_evaluate_integer(adev->handle, "_CCA",
1700 if (ACPI_SUCCESS(status))
1701 adev->flags.cca_seen = 1;
1702 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1704 * If architecture does not specify that _CCA is
1705 * required for DMA-able devices (e.g. x86),
1706 * we default to _CCA=1.
1710 acpi_handle_debug(adev->handle,
1711 "ACPI device is missing _CCA.\n");
1714 adev->flags.coherent_dma = cca;
1717 static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
1719 bool *is_serial_bus_slave_p = data;
1721 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1724 *is_serial_bus_slave_p = true;
1726 /* no need to do more checking */
1730 static bool acpi_is_indirect_io_slave(struct acpi_device *device)
1732 struct acpi_device *parent = acpi_dev_parent(device);
1733 static const struct acpi_device_id indirect_io_hosts[] = {
1738 return parent && !acpi_match_device_ids(parent, indirect_io_hosts);
1741 static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
1743 struct list_head resource_list;
1744 bool is_serial_bus_slave = false;
1745 static const struct acpi_device_id ignore_serial_bus_ids[] = {
1747 * These devices have multiple SerialBus resources and a client
1748 * device must be instantiated for each of them, each with
1749 * its own device id.
1750 * Normally we only instantiate one client device for the first
1751 * resource, using the ACPI HID as id. These special cases are handled
1752 * by the drivers/platform/x86/serial-multi-instantiate.c driver, which
1753 * knows which client device id to use for each resource.
1763 /* Non-conforming _HID for Cirrus Logic already released */
1767 * Some ACPI devs contain SerialBus resources even though they are not
1768 * attached to a serial bus at all.
1773 * HIDs of device with an UartSerialBusV2 resource for which userspace
1774 * expects a regular tty cdev to be created (instead of the in kernel
1775 * serdev) and which have a kernel driver which expects a platform_dev
1776 * such as the rfkill-gpio driver.
1783 if (acpi_is_indirect_io_slave(device))
1786 /* Macs use device properties in lieu of _CRS resources */
1787 if (x86_apple_machine &&
1788 (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||
1789 fwnode_property_present(&device->fwnode, "i2cAddress") ||
1790 fwnode_property_present(&device->fwnode, "baud")))
1793 if (!acpi_match_device_ids(device, ignore_serial_bus_ids))
1796 INIT_LIST_HEAD(&resource_list);
1797 acpi_dev_get_resources(device, &resource_list,
1798 acpi_check_serial_bus_slave,
1799 &is_serial_bus_slave);
1800 acpi_dev_free_resource_list(&resource_list);
1802 return is_serial_bus_slave;
1805 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1806 int type, void (*release)(struct device *))
1808 struct acpi_device *parent = acpi_find_parent_acpi_dev(handle);
1810 INIT_LIST_HEAD(&device->pnp.ids);
1811 device->device_type = type;
1812 device->handle = handle;
1813 device->dev.parent = parent ? &parent->dev : NULL;
1814 device->dev.release = release;
1815 device->dev.bus = &acpi_bus_type;
1816 fwnode_init(&device->fwnode, &acpi_device_fwnode_ops);
1817 acpi_set_device_status(device, ACPI_STA_DEFAULT);
1818 acpi_device_get_busid(device);
1819 acpi_set_pnp_ids(handle, &device->pnp, type);
1820 acpi_init_properties(device);
1821 acpi_bus_get_flags(device);
1822 device->flags.match_driver = false;
1823 device->flags.initialized = true;
1824 device->flags.enumeration_by_parent =
1825 acpi_device_enumeration_by_parent(device);
1826 acpi_device_clear_enumerated(device);
1827 device_initialize(&device->dev);
1828 dev_set_uevent_suppress(&device->dev, true);
1829 acpi_init_coherency(device);
1832 static void acpi_scan_dep_init(struct acpi_device *adev)
1834 struct acpi_dep_data *dep;
1836 list_for_each_entry(dep, &acpi_dep_list, node) {
1837 if (dep->consumer == adev->handle) {
1839 adev->flags.honor_deps = 1;
1847 void acpi_device_add_finalize(struct acpi_device *device)
1849 dev_set_uevent_suppress(&device->dev, false);
1850 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1853 static void acpi_scan_init_status(struct acpi_device *adev)
1855 if (acpi_bus_get_status(adev))
1856 acpi_set_device_status(adev, 0);
1859 static int acpi_add_single_object(struct acpi_device **child,
1860 acpi_handle handle, int type, bool dep_init)
1862 struct acpi_device *device;
1863 bool release_dep_lock = false;
1866 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1870 acpi_init_device_object(device, handle, type, acpi_device_release);
1872 * Getting the status is delayed till here so that we can call
1873 * acpi_bus_get_status() and use its quirk handling. Note that
1874 * this must be done before the get power-/wakeup_dev-flags calls.
1876 if (type == ACPI_BUS_TYPE_DEVICE || type == ACPI_BUS_TYPE_PROCESSOR) {
1878 mutex_lock(&acpi_dep_list_lock);
1880 * Hold the lock until the acpi_tie_acpi_dev() call
1881 * below to prevent concurrent acpi_scan_clear_dep()
1882 * from deleting a dependency list entry without
1883 * updating dep_unmet for the device.
1885 release_dep_lock = true;
1886 acpi_scan_dep_init(device);
1888 acpi_scan_init_status(device);
1891 acpi_bus_get_power_flags(device);
1892 acpi_bus_get_wakeup_device_flags(device);
1894 result = acpi_tie_acpi_dev(device);
1896 if (release_dep_lock)
1897 mutex_unlock(&acpi_dep_list_lock);
1900 result = acpi_device_add(device);
1903 acpi_device_release(&device->dev);
1907 acpi_power_add_remove_device(device, true);
1908 acpi_device_add_finalize(device);
1910 acpi_handle_debug(handle, "Added as %s, parent %s\n",
1911 dev_name(&device->dev), device->dev.parent ?
1912 dev_name(device->dev.parent) : "(null)");
1918 static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1921 struct resource *res = context;
1923 if (acpi_dev_resource_memory(ares, res))
1924 return AE_CTRL_TERMINATE;
1929 static bool acpi_device_should_be_hidden(acpi_handle handle)
1932 struct resource res;
1934 /* Check if it should ignore the UART device */
1935 if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1939 * The UART device described in SPCR table is assumed to have only one
1940 * memory resource present. So we only look for the first one here.
1942 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1943 acpi_get_resource_memory, &res);
1944 if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1947 acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1953 bool acpi_device_is_present(const struct acpi_device *adev)
1955 return adev->status.present || adev->status.functional;
1958 bool acpi_device_is_enabled(const struct acpi_device *adev)
1960 return adev->status.enabled;
1963 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1965 const struct acpi_device_id **matchid)
1967 const struct acpi_device_id *devid;
1970 return handler->match(idstr, matchid);
1972 for (devid = handler->ids; devid->id[0]; devid++)
1973 if (!strcmp((char *)devid->id, idstr)) {
1983 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1984 const struct acpi_device_id **matchid)
1986 struct acpi_scan_handler *handler;
1988 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1989 if (acpi_scan_handler_matching(handler, idstr, matchid))
1995 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1997 if (!!hotplug->enabled == !!val)
2000 mutex_lock(&acpi_scan_lock);
2002 hotplug->enabled = val;
2004 mutex_unlock(&acpi_scan_lock);
2007 static void acpi_scan_init_hotplug(struct acpi_device *adev)
2009 struct acpi_hardware_id *hwid;
2011 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
2012 acpi_dock_add(adev);
2015 list_for_each_entry(hwid, &adev->pnp.ids, list) {
2016 struct acpi_scan_handler *handler;
2018 handler = acpi_scan_match_handler(hwid->id, NULL);
2020 adev->flags.hotplug_notify = true;
2026 static u32 acpi_scan_check_dep(acpi_handle handle)
2028 struct acpi_handle_list dep_devices;
2033 * Check for _HID here to avoid deferring the enumeration of:
2035 * 2. ACPI nodes describing USB ports.
2036 * Still, checking for _HID catches more then just these cases ...
2038 if (!acpi_has_method(handle, "_DEP") || !acpi_has_method(handle, "_HID"))
2041 if (!acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices)) {
2042 acpi_handle_debug(handle, "Failed to evaluate _DEP.\n");
2046 for (count = 0, i = 0; i < dep_devices.count; i++) {
2047 struct acpi_device_info *info;
2048 struct acpi_dep_data *dep;
2049 bool skip, honor_dep;
2052 status = acpi_get_object_info(dep_devices.handles[i], &info);
2053 if (ACPI_FAILURE(status)) {
2054 acpi_handle_debug(handle, "Error reading _DEP device info\n");
2058 skip = acpi_info_matches_ids(info, acpi_ignore_dep_ids);
2059 honor_dep = acpi_info_matches_ids(info, acpi_honor_dep_ids);
2065 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
2071 dep->supplier = dep_devices.handles[i];
2072 dep->consumer = handle;
2073 dep->honor_dep = honor_dep;
2075 mutex_lock(&acpi_dep_list_lock);
2076 list_add_tail(&dep->node , &acpi_dep_list);
2077 mutex_unlock(&acpi_dep_list_lock);
2080 acpi_handle_list_free(&dep_devices);
2084 static acpi_status acpi_scan_check_crs_csi2_cb(acpi_handle handle, u32 a, void *b, void **c)
2086 acpi_mipi_check_crs_csi2(handle);
2090 static acpi_status acpi_bus_check_add(acpi_handle handle, bool first_pass,
2091 struct acpi_device **adev_p)
2093 struct acpi_device *device = acpi_fetch_acpi_dev(handle);
2094 acpi_object_type acpi_type;
2100 if (ACPI_FAILURE(acpi_get_type(handle, &acpi_type)))
2103 switch (acpi_type) {
2104 case ACPI_TYPE_DEVICE:
2105 if (acpi_device_should_be_hidden(handle))
2109 acpi_mipi_check_crs_csi2(handle);
2111 /* Bail out if there are dependencies. */
2112 if (acpi_scan_check_dep(handle) > 0) {
2114 * The entire CSI-2 connection graph needs to be
2115 * extracted before any drivers or scan handlers
2116 * are bound to struct device objects, so scan
2117 * _CRS CSI-2 resource descriptors for all
2118 * devices below the current handle.
2120 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
2122 acpi_scan_check_crs_csi2_cb,
2124 return AE_CTRL_DEPTH;
2129 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
2130 type = ACPI_BUS_TYPE_DEVICE;
2133 case ACPI_TYPE_PROCESSOR:
2134 type = ACPI_BUS_TYPE_PROCESSOR;
2137 case ACPI_TYPE_THERMAL:
2138 type = ACPI_BUS_TYPE_THERMAL;
2141 case ACPI_TYPE_POWER:
2142 acpi_add_power_resource(handle);
2149 * If first_pass is true at this point, the device has no dependencies,
2150 * or the creation of the device object would have been postponed above.
2152 acpi_add_single_object(&device, handle, type, !first_pass);
2154 return AE_CTRL_DEPTH;
2156 acpi_scan_init_hotplug(device);
2165 static acpi_status acpi_bus_check_add_1(acpi_handle handle, u32 lvl_not_used,
2166 void *not_used, void **ret_p)
2168 return acpi_bus_check_add(handle, true, (struct acpi_device **)ret_p);
2171 static acpi_status acpi_bus_check_add_2(acpi_handle handle, u32 lvl_not_used,
2172 void *not_used, void **ret_p)
2174 return acpi_bus_check_add(handle, false, (struct acpi_device **)ret_p);
2177 static void acpi_default_enumeration(struct acpi_device *device)
2180 * Do not enumerate devices with enumeration_by_parent flag set as
2181 * they will be enumerated by their respective parents.
2183 if (!device->flags.enumeration_by_parent) {
2184 acpi_create_platform_device(device, NULL);
2185 acpi_device_set_enumerated(device);
2187 blocking_notifier_call_chain(&acpi_reconfig_chain,
2188 ACPI_RECONFIG_DEVICE_ADD, device);
2192 static const struct acpi_device_id generic_device_ids[] = {
2193 {ACPI_DT_NAMESPACE_HID, },
2197 static int acpi_generic_device_attach(struct acpi_device *adev,
2198 const struct acpi_device_id *not_used)
2201 * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
2202 * below can be unconditional.
2204 if (adev->data.of_compatible)
2205 acpi_default_enumeration(adev);
2210 static struct acpi_scan_handler generic_device_handler = {
2211 .ids = generic_device_ids,
2212 .attach = acpi_generic_device_attach,
2215 static int acpi_scan_attach_handler(struct acpi_device *device)
2217 struct acpi_hardware_id *hwid;
2220 list_for_each_entry(hwid, &device->pnp.ids, list) {
2221 const struct acpi_device_id *devid;
2222 struct acpi_scan_handler *handler;
2224 handler = acpi_scan_match_handler(hwid->id, &devid);
2226 if (!handler->attach) {
2227 device->pnp.type.platform_id = 0;
2230 device->handler = handler;
2231 ret = handler->attach(device, devid);
2235 device->handler = NULL;
2244 static int acpi_bus_attach(struct acpi_device *device, void *first_pass)
2246 bool skip = !first_pass && device->flags.visited;
2253 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2254 register_dock_dependent_device(device, ejd);
2256 acpi_bus_get_status(device);
2257 /* Skip devices that are not ready for enumeration (e.g. not present) */
2258 if (!acpi_dev_ready_for_enumeration(device)) {
2259 device->flags.initialized = false;
2260 acpi_device_clear_enumerated(device);
2261 device->flags.power_manageable = 0;
2264 if (device->handler)
2267 if (!device->flags.initialized) {
2268 device->flags.power_manageable =
2269 device->power.states[ACPI_STATE_D0].flags.valid;
2270 if (acpi_bus_init_power(device))
2271 device->flags.power_manageable = 0;
2273 device->flags.initialized = true;
2274 } else if (device->flags.visited) {
2278 ret = acpi_scan_attach_handler(device);
2282 device->flags.match_driver = true;
2283 if (ret > 0 && !device->flags.enumeration_by_parent) {
2284 acpi_device_set_enumerated(device);
2288 ret = device_attach(&device->dev);
2292 if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
2293 acpi_default_enumeration(device);
2295 acpi_device_set_enumerated(device);
2298 acpi_dev_for_each_child(device, acpi_bus_attach, first_pass);
2300 if (!skip && device->handler && device->handler->hotplug.notify_online)
2301 device->handler->hotplug.notify_online(device);
2306 static int acpi_dev_get_next_consumer_dev_cb(struct acpi_dep_data *dep, void *data)
2308 struct acpi_device **adev_p = data;
2309 struct acpi_device *adev = *adev_p;
2312 * If we're passed a 'previous' consumer device then we need to skip
2313 * any consumers until we meet the previous one, and then NULL @data
2314 * so the next one can be returned.
2317 if (dep->consumer == adev->handle)
2323 adev = acpi_get_acpi_dev(dep->consumer);
2325 *(struct acpi_device **)data = adev;
2328 /* Continue parsing if the device object is not present. */
2332 struct acpi_scan_clear_dep_work {
2333 struct work_struct work;
2334 struct acpi_device *adev;
2337 static void acpi_scan_clear_dep_fn(struct work_struct *work)
2339 struct acpi_scan_clear_dep_work *cdw;
2341 cdw = container_of(work, struct acpi_scan_clear_dep_work, work);
2343 acpi_scan_lock_acquire();
2344 acpi_bus_attach(cdw->adev, (void *)true);
2345 acpi_scan_lock_release();
2347 acpi_dev_put(cdw->adev);
2351 static bool acpi_scan_clear_dep_queue(struct acpi_device *adev)
2353 struct acpi_scan_clear_dep_work *cdw;
2355 if (adev->dep_unmet)
2358 cdw = kmalloc(sizeof(*cdw), GFP_KERNEL);
2363 INIT_WORK(&cdw->work, acpi_scan_clear_dep_fn);
2365 * Since the work function may block on the lock until the entire
2366 * initial enumeration of devices is complete, put it into the unbound
2369 queue_work(system_unbound_wq, &cdw->work);
2374 static void acpi_scan_delete_dep_data(struct acpi_dep_data *dep)
2376 list_del(&dep->node);
2380 static int acpi_scan_clear_dep(struct acpi_dep_data *dep, void *data)
2382 struct acpi_device *adev = acpi_get_acpi_dev(dep->consumer);
2386 if (!acpi_scan_clear_dep_queue(adev))
2390 if (dep->free_when_met)
2391 acpi_scan_delete_dep_data(dep);
2399 * acpi_walk_dep_device_list - Apply a callback to every entry in acpi_dep_list
2400 * @handle: The ACPI handle of the supplier device
2401 * @callback: Pointer to the callback function to apply
2402 * @data: Pointer to some data to pass to the callback
2404 * The return value of the callback determines this function's behaviour. If 0
2405 * is returned we continue to iterate over acpi_dep_list. If a positive value
2406 * is returned then the loop is broken but this function returns 0. If a
2407 * negative value is returned by the callback then the loop is broken and that
2408 * value is returned as the final error.
2410 static int acpi_walk_dep_device_list(acpi_handle handle,
2411 int (*callback)(struct acpi_dep_data *, void *),
2414 struct acpi_dep_data *dep, *tmp;
2417 mutex_lock(&acpi_dep_list_lock);
2418 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2419 if (dep->supplier == handle) {
2420 ret = callback(dep, data);
2425 mutex_unlock(&acpi_dep_list_lock);
2427 return ret > 0 ? 0 : ret;
2431 * acpi_dev_clear_dependencies - Inform consumers that the device is now active
2432 * @supplier: Pointer to the supplier &struct acpi_device
2434 * Clear dependencies on the given device.
2436 void acpi_dev_clear_dependencies(struct acpi_device *supplier)
2438 acpi_walk_dep_device_list(supplier->handle, acpi_scan_clear_dep, NULL);
2440 EXPORT_SYMBOL_GPL(acpi_dev_clear_dependencies);
2443 * acpi_dev_ready_for_enumeration - Check if the ACPI device is ready for enumeration
2444 * @device: Pointer to the &struct acpi_device to check
2446 * Check if the device is present and has no unmet dependencies.
2448 * Return true if the device is ready for enumeratino. Otherwise, return false.
2450 bool acpi_dev_ready_for_enumeration(const struct acpi_device *device)
2452 if (device->flags.honor_deps && device->dep_unmet)
2455 return acpi_device_is_present(device);
2457 EXPORT_SYMBOL_GPL(acpi_dev_ready_for_enumeration);
2460 * acpi_dev_get_next_consumer_dev - Return the next adev dependent on @supplier
2461 * @supplier: Pointer to the dependee device
2462 * @start: Pointer to the current dependent device
2464 * Returns the next &struct acpi_device which declares itself dependent on
2465 * @supplier via the _DEP buffer, parsed from the acpi_dep_list.
2467 * If the returned adev is not passed as @start to this function, the caller is
2468 * responsible for putting the reference to adev when it is no longer needed.
2470 struct acpi_device *acpi_dev_get_next_consumer_dev(struct acpi_device *supplier,
2471 struct acpi_device *start)
2473 struct acpi_device *adev = start;
2475 acpi_walk_dep_device_list(supplier->handle,
2476 acpi_dev_get_next_consumer_dev_cb, &adev);
2478 acpi_dev_put(start);
2485 EXPORT_SYMBOL_GPL(acpi_dev_get_next_consumer_dev);
2487 static void acpi_scan_postponed_branch(acpi_handle handle)
2489 struct acpi_device *adev = NULL;
2491 if (ACPI_FAILURE(acpi_bus_check_add(handle, false, &adev)))
2494 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2495 acpi_bus_check_add_2, NULL, NULL, (void **)&adev);
2498 * Populate the ACPI _CRS CSI-2 software nodes for the ACPI devices that
2499 * have been added above.
2501 acpi_mipi_init_crs_csi2_swnodes();
2503 acpi_bus_attach(adev, NULL);
2506 static void acpi_scan_postponed(void)
2508 struct acpi_dep_data *dep, *tmp;
2510 mutex_lock(&acpi_dep_list_lock);
2512 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2513 acpi_handle handle = dep->consumer;
2516 * In case there are multiple acpi_dep_list entries with the
2517 * same consumer, skip the current entry if the consumer device
2518 * object corresponding to it is present already.
2520 if (!acpi_fetch_acpi_dev(handle)) {
2522 * Even though the lock is released here, tmp is
2523 * guaranteed to be valid, because none of the list
2524 * entries following dep is marked as "free when met"
2525 * and so they cannot be deleted.
2527 mutex_unlock(&acpi_dep_list_lock);
2529 acpi_scan_postponed_branch(handle);
2531 mutex_lock(&acpi_dep_list_lock);
2535 acpi_scan_delete_dep_data(dep);
2537 dep->free_when_met = true;
2540 mutex_unlock(&acpi_dep_list_lock);
2544 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2545 * @handle: Root of the namespace scope to scan.
2547 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2550 * If no devices were found, -ENODEV is returned, but it does not mean that
2551 * there has been a real error. There just have been no suitable ACPI objects
2552 * in the table trunk from which the kernel could create a device and add an
2553 * appropriate driver.
2555 * Must be called under acpi_scan_lock.
2557 int acpi_bus_scan(acpi_handle handle)
2559 struct acpi_device *device = NULL;
2561 /* Pass 1: Avoid enumerating devices with missing dependencies. */
2563 if (ACPI_SUCCESS(acpi_bus_check_add(handle, true, &device)))
2564 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2565 acpi_bus_check_add_1, NULL, NULL,
2572 * Set up ACPI _CRS CSI-2 software nodes using information extracted
2573 * from the _CRS CSI-2 resource descriptors during the ACPI namespace
2574 * walk above and MIPI DisCo for Imaging device properties.
2576 acpi_mipi_scan_crs_csi2();
2577 acpi_mipi_init_crs_csi2_swnodes();
2579 acpi_bus_attach(device, (void *)true);
2581 /* Pass 2: Enumerate all of the remaining devices. */
2583 acpi_scan_postponed();
2585 acpi_mipi_crs_csi2_cleanup();
2589 EXPORT_SYMBOL(acpi_bus_scan);
2592 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2593 * @adev: Root of the ACPI namespace scope to walk.
2595 * Must be called under acpi_scan_lock.
2597 void acpi_bus_trim(struct acpi_device *adev)
2599 acpi_scan_check_and_detach(adev, NULL);
2601 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2603 int acpi_bus_register_early_device(int type)
2605 struct acpi_device *device = NULL;
2608 result = acpi_add_single_object(&device, NULL, type, false);
2612 device->flags.match_driver = true;
2613 return device_attach(&device->dev);
2615 EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
2617 static void acpi_bus_scan_fixed(void)
2619 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2620 struct acpi_device *adev = NULL;
2622 acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_POWER_BUTTON,
2625 adev->flags.match_driver = true;
2626 if (device_attach(&adev->dev) >= 0)
2627 device_init_wakeup(&adev->dev, true);
2629 dev_dbg(&adev->dev, "No driver\n");
2633 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2634 struct acpi_device *adev = NULL;
2636 acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_SLEEP_BUTTON,
2639 adev->flags.match_driver = true;
2640 if (device_attach(&adev->dev) < 0)
2641 dev_dbg(&adev->dev, "No driver\n");
2646 static void __init acpi_get_spcr_uart_addr(void)
2649 struct acpi_table_spcr *spcr_ptr;
2651 status = acpi_get_table(ACPI_SIG_SPCR, 0,
2652 (struct acpi_table_header **)&spcr_ptr);
2653 if (ACPI_FAILURE(status)) {
2654 pr_warn("STAO table present, but SPCR is missing\n");
2658 spcr_uart_addr = spcr_ptr->serial_port.address;
2659 acpi_put_table((struct acpi_table_header *)spcr_ptr);
2662 static bool acpi_scan_initialized;
2664 void __init acpi_scan_init(void)
2667 struct acpi_table_stao *stao_ptr;
2669 acpi_pci_root_init();
2670 acpi_pci_link_init();
2671 acpi_processor_init();
2672 acpi_platform_init();
2675 acpi_cmos_rtc_init();
2676 acpi_container_init();
2677 acpi_memory_hotplug_init();
2678 acpi_watchdog_init();
2680 acpi_int340x_thermal_init();
2683 acpi_scan_add_handler(&generic_device_handler);
2686 * If there is STAO table, check whether it needs to ignore the UART
2687 * device in SPCR table.
2689 status = acpi_get_table(ACPI_SIG_STAO, 0,
2690 (struct acpi_table_header **)&stao_ptr);
2691 if (ACPI_SUCCESS(status)) {
2692 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2693 pr_info("STAO Name List not yet supported.\n");
2695 if (stao_ptr->ignore_uart)
2696 acpi_get_spcr_uart_addr();
2698 acpi_put_table((struct acpi_table_header *)stao_ptr);
2701 acpi_gpe_apply_masked_gpes();
2702 acpi_update_all_gpes();
2705 * Although we call __add_memory() that is documented to require the
2706 * device_hotplug_lock, it is not necessary here because this is an
2707 * early code when userspace or any other code path cannot trigger
2708 * hotplug/hotunplug operations.
2710 mutex_lock(&acpi_scan_lock);
2712 * Enumerate devices in the ACPI namespace.
2714 if (acpi_bus_scan(ACPI_ROOT_OBJECT))
2717 acpi_root = acpi_fetch_acpi_dev(ACPI_ROOT_OBJECT);
2721 /* Fixed feature devices do not exist on HW-reduced platform */
2722 if (!acpi_gbl_reduced_hardware)
2723 acpi_bus_scan_fixed();
2725 acpi_turn_off_unused_power_resources();
2727 acpi_scan_initialized = true;
2730 mutex_unlock(&acpi_scan_lock);
2733 static struct acpi_probe_entry *ape;
2734 static int acpi_probe_count;
2735 static DEFINE_MUTEX(acpi_probe_mutex);
2737 static int __init acpi_match_madt(union acpi_subtable_headers *header,
2738 const unsigned long end)
2740 if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape))
2741 if (!ape->probe_subtbl(header, end))
2747 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2754 mutex_lock(&acpi_probe_mutex);
2755 for (ape = ap_head; nr; ape++, nr--) {
2756 if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) {
2757 acpi_probe_count = 0;
2758 acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2759 count += acpi_probe_count;
2762 res = acpi_table_parse(ape->id, ape->probe_table);
2767 mutex_unlock(&acpi_probe_mutex);
2772 static void acpi_table_events_fn(struct work_struct *work)
2774 acpi_scan_lock_acquire();
2775 acpi_bus_scan(ACPI_ROOT_OBJECT);
2776 acpi_scan_lock_release();
2781 void acpi_scan_table_notify(void)
2783 struct work_struct *work;
2785 if (!acpi_scan_initialized)
2788 work = kmalloc(sizeof(*work), GFP_KERNEL);
2792 INIT_WORK(work, acpi_table_events_fn);
2793 schedule_work(work);
2796 int acpi_reconfig_notifier_register(struct notifier_block *nb)
2798 return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2800 EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2802 int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2804 return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2806 EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);