2 * scan.c - support for transforming the ACPI namespace into individual objects
5 #include <linux/module.h>
6 #include <linux/init.h>
7 #include <linux/slab.h>
8 #include <linux/kernel.h>
9 #include <linux/acpi.h>
10 #include <linux/signal.h>
11 #include <linux/kthread.h>
12 #include <linux/dmi.h>
13 #include <linux/nls.h>
14 #include <linux/dma-mapping.h>
16 #include <asm/pgtable.h>
20 #define _COMPONENT ACPI_BUS_COMPONENT
21 ACPI_MODULE_NAME("scan");
22 extern struct acpi_device *acpi_root;
24 #define ACPI_BUS_CLASS "system_bus"
25 #define ACPI_BUS_HID "LNXSYBUS"
26 #define ACPI_BUS_DEVICE_NAME "System Bus"
28 #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
30 #define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page)
33 * If set, devices will be hot-removed even if they cannot be put offline
34 * gracefully (from the kernel's standpoint).
36 bool acpi_force_hot_remove;
38 static const char *dummy_hid = "device";
40 static LIST_HEAD(acpi_dep_list);
41 static DEFINE_MUTEX(acpi_dep_list_lock);
42 static LIST_HEAD(acpi_bus_id_list);
43 static DEFINE_MUTEX(acpi_scan_lock);
44 static LIST_HEAD(acpi_scan_handlers_list);
45 DEFINE_MUTEX(acpi_device_lock);
46 LIST_HEAD(acpi_wakeup_device_list);
47 static DEFINE_MUTEX(acpi_hp_context_lock);
49 struct acpi_dep_data {
50 struct list_head node;
55 struct acpi_device_bus_id{
57 unsigned int instance_no;
58 struct list_head node;
61 void acpi_scan_lock_acquire(void)
63 mutex_lock(&acpi_scan_lock);
65 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
67 void acpi_scan_lock_release(void)
69 mutex_unlock(&acpi_scan_lock);
71 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
73 void acpi_lock_hp_context(void)
75 mutex_lock(&acpi_hp_context_lock);
78 void acpi_unlock_hp_context(void)
80 mutex_unlock(&acpi_hp_context_lock);
83 void acpi_initialize_hp_context(struct acpi_device *adev,
84 struct acpi_hotplug_context *hp,
85 int (*notify)(struct acpi_device *, u32),
86 void (*uevent)(struct acpi_device *, u32))
88 acpi_lock_hp_context();
91 acpi_set_hp_context(adev, hp);
92 acpi_unlock_hp_context();
94 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
96 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
101 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
105 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
106 const char *hotplug_profile_name)
110 error = acpi_scan_add_handler(handler);
114 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
118 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
120 struct acpi_device_physical_node *pn;
124 * acpi_container_offline() calls this for all of the container's
125 * children under the container's physical_node_lock lock.
127 mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
129 list_for_each_entry(pn, &adev->physical_node_list, node)
130 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
132 kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
138 mutex_unlock(&adev->physical_node_lock);
142 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
145 struct acpi_device *device = NULL;
146 struct acpi_device_physical_node *pn;
147 bool second_pass = (bool)data;
148 acpi_status status = AE_OK;
150 if (acpi_bus_get_device(handle, &device))
153 if (device->handler && !device->handler->hotplug.enabled) {
154 *ret_p = &device->dev;
158 mutex_lock(&device->physical_node_lock);
160 list_for_each_entry(pn, &device->physical_node_list, node) {
164 /* Skip devices offlined by the first pass. */
168 pn->put_online = false;
170 ret = device_offline(pn->dev);
171 if (acpi_force_hot_remove)
175 pn->put_online = !ret;
185 mutex_unlock(&device->physical_node_lock);
190 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
193 struct acpi_device *device = NULL;
194 struct acpi_device_physical_node *pn;
196 if (acpi_bus_get_device(handle, &device))
199 mutex_lock(&device->physical_node_lock);
201 list_for_each_entry(pn, &device->physical_node_list, node)
202 if (pn->put_online) {
203 device_online(pn->dev);
204 pn->put_online = false;
207 mutex_unlock(&device->physical_node_lock);
212 static int acpi_scan_try_to_offline(struct acpi_device *device)
214 acpi_handle handle = device->handle;
215 struct device *errdev = NULL;
219 * Carry out two passes here and ignore errors in the first pass,
220 * because if the devices in question are memory blocks and
221 * CONFIG_MEMCG is set, one of the blocks may hold data structures
222 * that the other blocks depend on, but it is not known in advance which
225 * If the first pass is successful, the second one isn't needed, though.
227 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
228 NULL, acpi_bus_offline, (void *)false,
230 if (status == AE_SUPPORT) {
231 dev_warn(errdev, "Offline disabled.\n");
232 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
233 acpi_bus_online, NULL, NULL, NULL);
236 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
239 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
240 NULL, acpi_bus_offline, (void *)true,
242 if (!errdev || acpi_force_hot_remove)
243 acpi_bus_offline(handle, 0, (void *)true,
246 if (errdev && !acpi_force_hot_remove) {
247 dev_warn(errdev, "Offline failed.\n");
248 acpi_bus_online(handle, 0, NULL, NULL);
249 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
250 ACPI_UINT32_MAX, acpi_bus_online,
258 static int acpi_scan_hot_remove(struct acpi_device *device)
260 acpi_handle handle = device->handle;
261 unsigned long long sta;
264 if (device->handler && device->handler->hotplug.demand_offline
265 && !acpi_force_hot_remove) {
266 if (!acpi_scan_is_offline(device, true))
269 int error = acpi_scan_try_to_offline(device);
274 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
275 "Hot-removing device %s...\n", dev_name(&device->dev)));
277 acpi_bus_trim(device);
279 acpi_evaluate_lck(handle, 0);
283 status = acpi_evaluate_ej0(handle);
284 if (status == AE_NOT_FOUND)
286 else if (ACPI_FAILURE(status))
290 * Verify if eject was indeed successful. If not, log an error
291 * message. No need to call _OST since _EJ0 call was made OK.
293 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
294 if (ACPI_FAILURE(status)) {
295 acpi_handle_warn(handle,
296 "Status check after eject failed (0x%x)\n", status);
297 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
298 acpi_handle_warn(handle,
299 "Eject incomplete - status 0x%llx\n", sta);
305 static int acpi_scan_device_not_present(struct acpi_device *adev)
307 if (!acpi_device_enumerated(adev)) {
308 dev_warn(&adev->dev, "Still not present\n");
315 static int acpi_scan_device_check(struct acpi_device *adev)
319 acpi_bus_get_status(adev);
320 if (adev->status.present || adev->status.functional) {
322 * This function is only called for device objects for which
323 * matching scan handlers exist. The only situation in which
324 * the scan handler is not attached to this device object yet
325 * is when the device has just appeared (either it wasn't
326 * present at all before or it was removed and then added
330 dev_warn(&adev->dev, "Already enumerated\n");
333 error = acpi_bus_scan(adev->handle);
335 dev_warn(&adev->dev, "Namespace scan failure\n");
338 if (!adev->handler) {
339 dev_warn(&adev->dev, "Enumeration failure\n");
343 error = acpi_scan_device_not_present(adev);
348 static int acpi_scan_bus_check(struct acpi_device *adev)
350 struct acpi_scan_handler *handler = adev->handler;
351 struct acpi_device *child;
354 acpi_bus_get_status(adev);
355 if (!(adev->status.present || adev->status.functional)) {
356 acpi_scan_device_not_present(adev);
359 if (handler && handler->hotplug.scan_dependent)
360 return handler->hotplug.scan_dependent(adev);
362 error = acpi_bus_scan(adev->handle);
364 dev_warn(&adev->dev, "Namespace scan failure\n");
367 list_for_each_entry(child, &adev->children, node) {
368 error = acpi_scan_bus_check(child);
375 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
378 case ACPI_NOTIFY_BUS_CHECK:
379 return acpi_scan_bus_check(adev);
380 case ACPI_NOTIFY_DEVICE_CHECK:
381 return acpi_scan_device_check(adev);
382 case ACPI_NOTIFY_EJECT_REQUEST:
383 case ACPI_OST_EC_OSPM_EJECT:
384 if (adev->handler && !adev->handler->hotplug.enabled) {
385 dev_info(&adev->dev, "Eject disabled\n");
388 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
389 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
390 return acpi_scan_hot_remove(adev);
395 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
397 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
400 lock_device_hotplug();
401 mutex_lock(&acpi_scan_lock);
404 * The device object's ACPI handle cannot become invalid as long as we
405 * are holding acpi_scan_lock, but it might have become invalid before
406 * that lock was acquired.
408 if (adev->handle == INVALID_ACPI_HANDLE)
411 if (adev->flags.is_dock_station) {
412 error = dock_notify(adev, src);
413 } else if (adev->flags.hotplug_notify) {
414 error = acpi_generic_hotplug_event(adev, src);
415 if (error == -EPERM) {
416 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
420 int (*notify)(struct acpi_device *, u32);
422 acpi_lock_hp_context();
423 notify = adev->hp ? adev->hp->notify : NULL;
424 acpi_unlock_hp_context();
426 * There may be additional notify handlers for device objects
427 * without the .event() callback, so ignore them here.
430 error = notify(adev, src);
435 ost_code = ACPI_OST_SC_SUCCESS;
438 acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
441 acpi_bus_put_acpi_device(adev);
442 mutex_unlock(&acpi_scan_lock);
443 unlock_device_hotplug();
446 static void acpi_free_power_resources_lists(struct acpi_device *device)
450 if (device->wakeup.flags.valid)
451 acpi_power_resources_list_free(&device->wakeup.resources);
453 if (!device->power.flags.power_resources)
456 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
457 struct acpi_device_power_state *ps = &device->power.states[i];
458 acpi_power_resources_list_free(&ps->resources);
462 static void acpi_device_release(struct device *dev)
464 struct acpi_device *acpi_dev = to_acpi_device(dev);
466 acpi_free_properties(acpi_dev);
467 acpi_free_pnp_ids(&acpi_dev->pnp);
468 acpi_free_power_resources_lists(acpi_dev);
472 static void acpi_device_del(struct acpi_device *device)
474 mutex_lock(&acpi_device_lock);
476 list_del(&device->node);
478 list_del(&device->wakeup_list);
479 mutex_unlock(&acpi_device_lock);
481 acpi_power_add_remove_device(device, false);
482 acpi_device_remove_files(device);
484 device->remove(device);
486 device_del(&device->dev);
489 static LIST_HEAD(acpi_device_del_list);
490 static DEFINE_MUTEX(acpi_device_del_lock);
492 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
495 struct acpi_device *adev;
497 mutex_lock(&acpi_device_del_lock);
499 if (list_empty(&acpi_device_del_list)) {
500 mutex_unlock(&acpi_device_del_lock);
503 adev = list_first_entry(&acpi_device_del_list,
504 struct acpi_device, del_list);
505 list_del(&adev->del_list);
507 mutex_unlock(&acpi_device_del_lock);
509 acpi_device_del(adev);
511 * Drop references to all power resources that might have been
512 * used by the device.
514 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
515 put_device(&adev->dev);
520 * acpi_scan_drop_device - Drop an ACPI device object.
521 * @handle: Handle of an ACPI namespace node, not used.
522 * @context: Address of the ACPI device object to drop.
524 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
525 * namespace node the device object pointed to by @context is attached to.
527 * The unregistration is carried out asynchronously to avoid running
528 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
529 * ensure the correct ordering (the device objects must be unregistered in the
530 * same order in which the corresponding namespace nodes are deleted).
532 static void acpi_scan_drop_device(acpi_handle handle, void *context)
534 static DECLARE_WORK(work, acpi_device_del_work_fn);
535 struct acpi_device *adev = context;
537 mutex_lock(&acpi_device_del_lock);
540 * Use the ACPI hotplug workqueue which is ordered, so this work item
541 * won't run after any hotplug work items submitted subsequently. That
542 * prevents attempts to register device objects identical to those being
543 * deleted from happening concurrently (such attempts result from
544 * hotplug events handled via the ACPI hotplug workqueue). It also will
545 * run after all of the work items submitted previosuly, which helps
546 * those work items to ensure that they are not accessing stale device
549 if (list_empty(&acpi_device_del_list))
550 acpi_queue_hotplug_work(&work);
552 list_add_tail(&adev->del_list, &acpi_device_del_list);
553 /* Make acpi_ns_validate_handle() return NULL for this handle. */
554 adev->handle = INVALID_ACPI_HANDLE;
556 mutex_unlock(&acpi_device_del_lock);
559 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
560 void (*callback)(void *))
567 status = acpi_get_data_full(handle, acpi_scan_drop_device,
568 (void **)device, callback);
569 if (ACPI_FAILURE(status) || !*device) {
570 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
577 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
579 return acpi_get_device_data(handle, device, NULL);
581 EXPORT_SYMBOL(acpi_bus_get_device);
583 static void get_acpi_device(void *dev)
586 get_device(&((struct acpi_device *)dev)->dev);
589 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
591 struct acpi_device *adev = NULL;
593 acpi_get_device_data(handle, &adev, get_acpi_device);
597 void acpi_bus_put_acpi_device(struct acpi_device *adev)
599 put_device(&adev->dev);
602 int acpi_device_add(struct acpi_device *device,
603 void (*release)(struct device *))
606 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
609 if (device->handle) {
612 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
614 if (ACPI_FAILURE(status)) {
615 acpi_handle_err(device->handle,
616 "Unable to attach device data\n");
624 * Link this device to its parent and siblings.
626 INIT_LIST_HEAD(&device->children);
627 INIT_LIST_HEAD(&device->node);
628 INIT_LIST_HEAD(&device->wakeup_list);
629 INIT_LIST_HEAD(&device->physical_node_list);
630 INIT_LIST_HEAD(&device->del_list);
631 mutex_init(&device->physical_node_lock);
633 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
635 pr_err(PREFIX "Memory allocation error\n");
640 mutex_lock(&acpi_device_lock);
642 * Find suitable bus_id and instance number in acpi_bus_id_list
643 * If failed, create one and link it into acpi_bus_id_list
645 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
646 if (!strcmp(acpi_device_bus_id->bus_id,
647 acpi_device_hid(device))) {
648 acpi_device_bus_id->instance_no++;
655 acpi_device_bus_id = new_bus_id;
656 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
657 acpi_device_bus_id->instance_no = 0;
658 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
660 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
663 list_add_tail(&device->node, &device->parent->children);
665 if (device->wakeup.flags.valid)
666 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
667 mutex_unlock(&acpi_device_lock);
670 device->dev.parent = &device->parent->dev;
671 device->dev.bus = &acpi_bus_type;
672 device->dev.release = release;
673 result = device_add(&device->dev);
675 dev_err(&device->dev, "Error registering device\n");
679 result = acpi_device_setup_files(device);
681 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
682 dev_name(&device->dev));
687 mutex_lock(&acpi_device_lock);
689 list_del(&device->node);
690 list_del(&device->wakeup_list);
691 mutex_unlock(&acpi_device_lock);
694 acpi_detach_data(device->handle, acpi_scan_drop_device);
698 struct acpi_device *acpi_get_next_child(struct device *dev,
699 struct acpi_device *child)
701 struct acpi_device *adev = ACPI_COMPANION(dev);
702 struct list_head *head, *next;
707 head = &adev->children;
708 if (list_empty(head))
712 return list_first_entry(head, struct acpi_device, node);
714 next = child->node.next;
715 return next == head ? NULL : list_entry(next, struct acpi_device, node);
718 /* --------------------------------------------------------------------------
720 -------------------------------------------------------------------------- */
721 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
723 struct acpi_device *device = NULL;
727 * Fixed hardware devices do not appear in the namespace and do not
728 * have handles, but we fabricate acpi_devices for them, so we have
729 * to deal with them specially.
735 status = acpi_get_parent(handle, &handle);
736 if (ACPI_FAILURE(status))
737 return status == AE_NULL_ENTRY ? NULL : acpi_root;
738 } while (acpi_bus_get_device(handle, &device));
743 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
747 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
748 union acpi_object *obj;
750 status = acpi_get_handle(handle, "_EJD", &tmp);
751 if (ACPI_FAILURE(status))
754 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
755 if (ACPI_SUCCESS(status)) {
756 obj = buffer.pointer;
757 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
759 kfree(buffer.pointer);
763 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
765 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
766 struct acpi_device_wakeup *wakeup)
768 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
769 union acpi_object *package = NULL;
770 union acpi_object *element = NULL;
777 INIT_LIST_HEAD(&wakeup->resources);
780 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
781 if (ACPI_FAILURE(status)) {
782 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
786 package = (union acpi_object *)buffer.pointer;
788 if (!package || package->package.count < 2)
791 element = &(package->package.elements[0]);
795 if (element->type == ACPI_TYPE_PACKAGE) {
796 if ((element->package.count < 2) ||
797 (element->package.elements[0].type !=
798 ACPI_TYPE_LOCAL_REFERENCE)
799 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
803 element->package.elements[0].reference.handle;
805 (u32) element->package.elements[1].integer.value;
806 } else if (element->type == ACPI_TYPE_INTEGER) {
807 wakeup->gpe_device = NULL;
808 wakeup->gpe_number = element->integer.value;
813 element = &(package->package.elements[1]);
814 if (element->type != ACPI_TYPE_INTEGER)
817 wakeup->sleep_state = element->integer.value;
819 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
823 if (!list_empty(&wakeup->resources)) {
826 err = acpi_power_wakeup_list_init(&wakeup->resources,
829 acpi_handle_warn(handle, "Retrieving current states "
830 "of wakeup power resources failed\n");
831 acpi_power_resources_list_free(&wakeup->resources);
834 if (sleep_state < wakeup->sleep_state) {
835 acpi_handle_warn(handle, "Overriding _PRW sleep state "
836 "(S%d) by S%d from power resources\n",
837 (int)wakeup->sleep_state, sleep_state);
838 wakeup->sleep_state = sleep_state;
843 kfree(buffer.pointer);
847 static void acpi_wakeup_gpe_init(struct acpi_device *device)
849 static const struct acpi_device_id button_device_ids[] = {
855 struct acpi_device_wakeup *wakeup = &device->wakeup;
857 acpi_event_status event_status;
859 wakeup->flags.notifier_present = 0;
861 /* Power button, Lid switch always enable wakeup */
862 if (!acpi_match_device_ids(device, button_device_ids)) {
863 wakeup->flags.run_wake = 1;
864 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
865 /* Do not use Lid/sleep button for S5 wakeup */
866 if (wakeup->sleep_state == ACPI_STATE_S5)
867 wakeup->sleep_state = ACPI_STATE_S4;
869 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
870 device_set_wakeup_capable(&device->dev, true);
874 acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
876 status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number,
878 if (ACPI_FAILURE(status))
881 wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HAS_HANDLER);
884 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
888 /* Presence of _PRW indicates wake capable */
889 if (!acpi_has_method(device->handle, "_PRW"))
892 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
895 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
899 device->wakeup.flags.valid = 1;
900 device->wakeup.prepare_count = 0;
901 acpi_wakeup_gpe_init(device);
902 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
903 * system for the ACPI device with the _PRW object.
904 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
905 * So it is necessary to call _DSW object first. Only when it is not
906 * present will the _PSW object used.
908 err = acpi_device_sleep_wake(device, 0, 0, 0);
910 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
911 "error in _DSW or _PSW evaluation\n"));
914 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
916 struct acpi_device_power_state *ps = &device->power.states[state];
917 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
918 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
921 INIT_LIST_HEAD(&ps->resources);
923 /* Evaluate "_PRx" to get referenced power resources */
924 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
925 if (ACPI_SUCCESS(status)) {
926 union acpi_object *package = buffer.pointer;
928 if (buffer.length && package
929 && package->type == ACPI_TYPE_PACKAGE
930 && package->package.count) {
931 int err = acpi_extract_power_resources(package, 0,
934 device->power.flags.power_resources = 1;
936 ACPI_FREE(buffer.pointer);
939 /* Evaluate "_PSx" to see if we can do explicit sets */
941 if (acpi_has_method(device->handle, pathname))
942 ps->flags.explicit_set = 1;
944 /* State is valid if there are means to put the device into it. */
945 if (!list_empty(&ps->resources) || ps->flags.explicit_set)
948 ps->power = -1; /* Unknown - driver assigned */
949 ps->latency = -1; /* Unknown - driver assigned */
952 static void acpi_bus_get_power_flags(struct acpi_device *device)
956 /* Presence of _PS0|_PR0 indicates 'power manageable' */
957 if (!acpi_has_method(device->handle, "_PS0") &&
958 !acpi_has_method(device->handle, "_PR0"))
961 device->flags.power_manageable = 1;
964 * Power Management Flags
966 if (acpi_has_method(device->handle, "_PSC"))
967 device->power.flags.explicit_get = 1;
969 if (acpi_has_method(device->handle, "_IRC"))
970 device->power.flags.inrush_current = 1;
972 if (acpi_has_method(device->handle, "_DSW"))
973 device->power.flags.dsw_present = 1;
976 * Enumerate supported power management states
978 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
979 acpi_bus_init_power_state(device, i);
981 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
982 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
983 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
985 /* Set defaults for D0 and D3hot states (always valid) */
986 device->power.states[ACPI_STATE_D0].flags.valid = 1;
987 device->power.states[ACPI_STATE_D0].power = 100;
988 device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
990 if (acpi_bus_init_power(device))
991 device->flags.power_manageable = 0;
994 static void acpi_bus_get_flags(struct acpi_device *device)
996 /* Presence of _STA indicates 'dynamic_status' */
997 if (acpi_has_method(device->handle, "_STA"))
998 device->flags.dynamic_status = 1;
1000 /* Presence of _RMV indicates 'removable' */
1001 if (acpi_has_method(device->handle, "_RMV"))
1002 device->flags.removable = 1;
1004 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1005 if (acpi_has_method(device->handle, "_EJD") ||
1006 acpi_has_method(device->handle, "_EJ0"))
1007 device->flags.ejectable = 1;
1010 static void acpi_device_get_busid(struct acpi_device *device)
1012 char bus_id[5] = { '?', 0 };
1013 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1019 * The device's Bus ID is simply the object name.
1020 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1022 if (ACPI_IS_ROOT_DEVICE(device)) {
1023 strcpy(device->pnp.bus_id, "ACPI");
1027 switch (device->device_type) {
1028 case ACPI_BUS_TYPE_POWER_BUTTON:
1029 strcpy(device->pnp.bus_id, "PWRF");
1031 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1032 strcpy(device->pnp.bus_id, "SLPF");
1035 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1036 /* Clean up trailing underscores (if any) */
1037 for (i = 3; i > 1; i--) {
1038 if (bus_id[i] == '_')
1043 strcpy(device->pnp.bus_id, bus_id);
1049 * acpi_ata_match - see if an acpi object is an ATA device
1051 * If an acpi object has one of the ACPI ATA methods defined,
1052 * then we can safely call it an ATA device.
1054 bool acpi_ata_match(acpi_handle handle)
1056 return acpi_has_method(handle, "_GTF") ||
1057 acpi_has_method(handle, "_GTM") ||
1058 acpi_has_method(handle, "_STM") ||
1059 acpi_has_method(handle, "_SDD");
1063 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1065 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1066 * then we can safely call it an ejectable drive bay
1068 bool acpi_bay_match(acpi_handle handle)
1070 acpi_handle phandle;
1072 if (!acpi_has_method(handle, "_EJ0"))
1074 if (acpi_ata_match(handle))
1076 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1079 return acpi_ata_match(phandle);
1082 bool acpi_device_is_battery(struct acpi_device *adev)
1084 struct acpi_hardware_id *hwid;
1086 list_for_each_entry(hwid, &adev->pnp.ids, list)
1087 if (!strcmp("PNP0C0A", hwid->id))
1093 static bool is_ejectable_bay(struct acpi_device *adev)
1095 acpi_handle handle = adev->handle;
1097 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1100 return acpi_bay_match(handle);
1104 * acpi_dock_match - see if an acpi object has a _DCK method
1106 bool acpi_dock_match(acpi_handle handle)
1108 return acpi_has_method(handle, "_DCK");
1112 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1113 void **return_value)
1115 long *cap = context;
1117 if (acpi_has_method(handle, "_BCM") &&
1118 acpi_has_method(handle, "_BCL")) {
1119 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
1121 *cap |= ACPI_VIDEO_BACKLIGHT;
1122 if (!acpi_has_method(handle, "_BQC"))
1123 printk(KERN_WARNING FW_BUG PREFIX "No _BQC method, "
1124 "cannot determine initial brightness\n");
1125 /* We have backlight support, no need to scan further */
1126 return AE_CTRL_TERMINATE;
1131 /* Returns true if the ACPI object is a video device which can be
1132 * handled by video.ko.
1133 * The device will get a Linux specific CID added in scan.c to
1134 * identify the device as an ACPI graphics device
1135 * Be aware that the graphics device may not be physically present
1136 * Use acpi_video_get_capabilities() to detect general ACPI video
1137 * capabilities of present cards
1139 long acpi_is_video_device(acpi_handle handle)
1141 long video_caps = 0;
1143 /* Is this device able to support video switching ? */
1144 if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1145 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1147 /* Is this device able to retrieve a video ROM ? */
1148 if (acpi_has_method(handle, "_ROM"))
1149 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1151 /* Is this device able to configure which video head to be POSTed ? */
1152 if (acpi_has_method(handle, "_VPO") &&
1153 acpi_has_method(handle, "_GPD") &&
1154 acpi_has_method(handle, "_SPD"))
1155 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1157 /* Only check for backlight functionality if one of the above hit. */
1159 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1160 ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1165 EXPORT_SYMBOL(acpi_is_video_device);
1167 const char *acpi_device_hid(struct acpi_device *device)
1169 struct acpi_hardware_id *hid;
1171 if (list_empty(&device->pnp.ids))
1174 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1177 EXPORT_SYMBOL(acpi_device_hid);
1179 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1181 struct acpi_hardware_id *id;
1183 id = kmalloc(sizeof(*id), GFP_KERNEL);
1187 id->id = kstrdup(dev_id, GFP_KERNEL);
1193 list_add_tail(&id->list, &pnp->ids);
1194 pnp->type.hardware_id = 1;
1198 * Old IBM workstations have a DSDT bug wherein the SMBus object
1199 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1200 * prefix. Work around this.
1202 static bool acpi_ibm_smbus_match(acpi_handle handle)
1204 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1205 struct acpi_buffer path = { sizeof(node_name), node_name };
1207 if (!dmi_name_in_vendors("IBM"))
1210 /* Look for SMBS object */
1211 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1212 strcmp("SMBS", path.pointer))
1215 /* Does it have the necessary (but misnamed) methods? */
1216 if (acpi_has_method(handle, "SBI") &&
1217 acpi_has_method(handle, "SBR") &&
1218 acpi_has_method(handle, "SBW"))
1224 static bool acpi_object_is_system_bus(acpi_handle handle)
1228 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1231 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1238 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1242 struct acpi_device_info *info;
1243 struct acpi_pnp_device_id_list *cid_list;
1246 switch (device_type) {
1247 case ACPI_BUS_TYPE_DEVICE:
1248 if (handle == ACPI_ROOT_OBJECT) {
1249 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1253 status = acpi_get_object_info(handle, &info);
1254 if (ACPI_FAILURE(status)) {
1255 pr_err(PREFIX "%s: Error reading device info\n",
1260 if (info->valid & ACPI_VALID_HID) {
1261 acpi_add_id(pnp, info->hardware_id.string);
1262 pnp->type.platform_id = 1;
1264 if (info->valid & ACPI_VALID_CID) {
1265 cid_list = &info->compatible_id_list;
1266 for (i = 0; i < cid_list->count; i++)
1267 acpi_add_id(pnp, cid_list->ids[i].string);
1269 if (info->valid & ACPI_VALID_ADR) {
1270 pnp->bus_address = info->address;
1271 pnp->type.bus_address = 1;
1273 if (info->valid & ACPI_VALID_UID)
1274 pnp->unique_id = kstrdup(info->unique_id.string,
1276 if (info->valid & ACPI_VALID_CLS)
1277 acpi_add_id(pnp, info->class_code.string);
1282 * Some devices don't reliably have _HIDs & _CIDs, so add
1283 * synthetic HIDs to make sure drivers can find them.
1285 if (acpi_is_video_device(handle))
1286 acpi_add_id(pnp, ACPI_VIDEO_HID);
1287 else if (acpi_bay_match(handle))
1288 acpi_add_id(pnp, ACPI_BAY_HID);
1289 else if (acpi_dock_match(handle))
1290 acpi_add_id(pnp, ACPI_DOCK_HID);
1291 else if (acpi_ibm_smbus_match(handle))
1292 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1293 else if (list_empty(&pnp->ids) &&
1294 acpi_object_is_system_bus(handle)) {
1295 /* \_SB, \_TZ, LNXSYBUS */
1296 acpi_add_id(pnp, ACPI_BUS_HID);
1297 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1298 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1302 case ACPI_BUS_TYPE_POWER:
1303 acpi_add_id(pnp, ACPI_POWER_HID);
1305 case ACPI_BUS_TYPE_PROCESSOR:
1306 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1308 case ACPI_BUS_TYPE_THERMAL:
1309 acpi_add_id(pnp, ACPI_THERMAL_HID);
1311 case ACPI_BUS_TYPE_POWER_BUTTON:
1312 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1314 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1315 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1320 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1322 struct acpi_hardware_id *id, *tmp;
1324 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1328 kfree(pnp->unique_id);
1331 static void acpi_init_coherency(struct acpi_device *adev)
1333 unsigned long long cca = 0;
1335 struct acpi_device *parent = adev->parent;
1337 if (parent && parent->flags.cca_seen) {
1339 * From ACPI spec, OSPM will ignore _CCA if an ancestor
1342 adev->flags.cca_seen = 1;
1343 cca = parent->flags.coherent_dma;
1345 status = acpi_evaluate_integer(adev->handle, "_CCA",
1347 if (ACPI_SUCCESS(status))
1348 adev->flags.cca_seen = 1;
1349 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1351 * If architecture does not specify that _CCA is
1352 * required for DMA-able devices (e.g. x86),
1353 * we default to _CCA=1.
1357 acpi_handle_debug(adev->handle,
1358 "ACPI device is missing _CCA.\n");
1361 adev->flags.coherent_dma = cca;
1364 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1365 int type, unsigned long long sta)
1367 INIT_LIST_HEAD(&device->pnp.ids);
1368 device->device_type = type;
1369 device->handle = handle;
1370 device->parent = acpi_bus_get_parent(handle);
1371 device->fwnode.type = FWNODE_ACPI;
1372 acpi_set_device_status(device, sta);
1373 acpi_device_get_busid(device);
1374 acpi_set_pnp_ids(handle, &device->pnp, type);
1375 acpi_init_properties(device);
1376 acpi_bus_get_flags(device);
1377 device->flags.match_driver = false;
1378 device->flags.initialized = true;
1379 device->flags.visited = false;
1380 device_initialize(&device->dev);
1381 dev_set_uevent_suppress(&device->dev, true);
1382 acpi_init_coherency(device);
1385 void acpi_device_add_finalize(struct acpi_device *device)
1387 dev_set_uevent_suppress(&device->dev, false);
1388 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1391 static int acpi_add_single_object(struct acpi_device **child,
1392 acpi_handle handle, int type,
1393 unsigned long long sta)
1396 struct acpi_device *device;
1397 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1399 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1401 printk(KERN_ERR PREFIX "Memory allocation error\n");
1405 acpi_init_device_object(device, handle, type, sta);
1406 acpi_bus_get_power_flags(device);
1407 acpi_bus_get_wakeup_device_flags(device);
1409 result = acpi_device_add(device, acpi_device_release);
1411 acpi_device_release(&device->dev);
1415 acpi_power_add_remove_device(device, true);
1416 acpi_device_add_finalize(device);
1417 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1418 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1419 dev_name(&device->dev), (char *) buffer.pointer,
1420 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1421 kfree(buffer.pointer);
1426 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1427 unsigned long long *sta)
1430 acpi_object_type acpi_type;
1432 status = acpi_get_type(handle, &acpi_type);
1433 if (ACPI_FAILURE(status))
1436 switch (acpi_type) {
1437 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1438 case ACPI_TYPE_DEVICE:
1439 *type = ACPI_BUS_TYPE_DEVICE;
1440 status = acpi_bus_get_status_handle(handle, sta);
1441 if (ACPI_FAILURE(status))
1444 case ACPI_TYPE_PROCESSOR:
1445 *type = ACPI_BUS_TYPE_PROCESSOR;
1446 status = acpi_bus_get_status_handle(handle, sta);
1447 if (ACPI_FAILURE(status))
1450 case ACPI_TYPE_THERMAL:
1451 *type = ACPI_BUS_TYPE_THERMAL;
1452 *sta = ACPI_STA_DEFAULT;
1454 case ACPI_TYPE_POWER:
1455 *type = ACPI_BUS_TYPE_POWER;
1456 *sta = ACPI_STA_DEFAULT;
1465 bool acpi_device_is_present(struct acpi_device *adev)
1467 if (adev->status.present || adev->status.functional)
1470 adev->flags.initialized = false;
1474 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1476 const struct acpi_device_id **matchid)
1478 const struct acpi_device_id *devid;
1481 return handler->match(idstr, matchid);
1483 for (devid = handler->ids; devid->id[0]; devid++)
1484 if (!strcmp((char *)devid->id, idstr)) {
1494 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
1495 const struct acpi_device_id **matchid)
1497 struct acpi_scan_handler *handler;
1499 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1500 if (acpi_scan_handler_matching(handler, idstr, matchid))
1506 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1508 if (!!hotplug->enabled == !!val)
1511 mutex_lock(&acpi_scan_lock);
1513 hotplug->enabled = val;
1515 mutex_unlock(&acpi_scan_lock);
1518 static void acpi_scan_init_hotplug(struct acpi_device *adev)
1520 struct acpi_hardware_id *hwid;
1522 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1523 acpi_dock_add(adev);
1526 list_for_each_entry(hwid, &adev->pnp.ids, list) {
1527 struct acpi_scan_handler *handler;
1529 handler = acpi_scan_match_handler(hwid->id, NULL);
1531 adev->flags.hotplug_notify = true;
1537 static void acpi_device_dep_initialize(struct acpi_device *adev)
1539 struct acpi_dep_data *dep;
1540 struct acpi_handle_list dep_devices;
1544 if (!acpi_has_method(adev->handle, "_DEP"))
1547 status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
1549 if (ACPI_FAILURE(status)) {
1550 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
1554 for (i = 0; i < dep_devices.count; i++) {
1555 struct acpi_device_info *info;
1558 status = acpi_get_object_info(dep_devices.handles[i], &info);
1559 if (ACPI_FAILURE(status)) {
1560 dev_dbg(&adev->dev, "Error reading _DEP device info\n");
1565 * Skip the dependency of Windows System Power
1566 * Management Controller
1568 skip = info->valid & ACPI_VALID_HID &&
1569 !strcmp(info->hardware_id.string, "INT3396");
1576 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
1580 dep->master = dep_devices.handles[i];
1581 dep->slave = adev->handle;
1584 mutex_lock(&acpi_dep_list_lock);
1585 list_add_tail(&dep->node , &acpi_dep_list);
1586 mutex_unlock(&acpi_dep_list_lock);
1590 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1591 void *not_used, void **return_value)
1593 struct acpi_device *device = NULL;
1595 unsigned long long sta;
1598 acpi_bus_get_device(handle, &device);
1602 result = acpi_bus_type_and_status(handle, &type, &sta);
1606 if (type == ACPI_BUS_TYPE_POWER) {
1607 acpi_add_power_resource(handle);
1611 acpi_add_single_object(&device, handle, type, sta);
1613 return AE_CTRL_DEPTH;
1615 acpi_scan_init_hotplug(device);
1616 acpi_device_dep_initialize(device);
1620 *return_value = device;
1625 static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
1627 bool *is_spi_i2c_slave_p = data;
1629 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1633 * devices that are connected to UART still need to be enumerated to
1636 if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
1637 *is_spi_i2c_slave_p = true;
1639 /* no need to do more checking */
1643 static void acpi_default_enumeration(struct acpi_device *device)
1645 struct list_head resource_list;
1646 bool is_spi_i2c_slave = false;
1649 * Do not enemerate SPI/I2C slaves as they will be enuerated by their
1650 * respective parents.
1652 INIT_LIST_HEAD(&resource_list);
1653 acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
1655 acpi_dev_free_resource_list(&resource_list);
1656 if (!is_spi_i2c_slave)
1657 acpi_create_platform_device(device);
1660 static const struct acpi_device_id generic_device_ids[] = {
1661 {ACPI_DT_NAMESPACE_HID, },
1665 static int acpi_generic_device_attach(struct acpi_device *adev,
1666 const struct acpi_device_id *not_used)
1669 * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
1670 * below can be unconditional.
1672 if (adev->data.of_compatible)
1673 acpi_default_enumeration(adev);
1678 static struct acpi_scan_handler generic_device_handler = {
1679 .ids = generic_device_ids,
1680 .attach = acpi_generic_device_attach,
1683 static int acpi_scan_attach_handler(struct acpi_device *device)
1685 struct acpi_hardware_id *hwid;
1688 list_for_each_entry(hwid, &device->pnp.ids, list) {
1689 const struct acpi_device_id *devid;
1690 struct acpi_scan_handler *handler;
1692 handler = acpi_scan_match_handler(hwid->id, &devid);
1694 if (!handler->attach) {
1695 device->pnp.type.platform_id = 0;
1698 device->handler = handler;
1699 ret = handler->attach(device, devid);
1703 device->handler = NULL;
1712 static void acpi_bus_attach(struct acpi_device *device)
1714 struct acpi_device *child;
1718 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
1719 register_dock_dependent_device(device, ejd);
1721 acpi_bus_get_status(device);
1722 /* Skip devices that are not present. */
1723 if (!acpi_device_is_present(device)) {
1724 device->flags.visited = false;
1725 device->flags.power_manageable = 0;
1728 if (device->handler)
1731 if (!device->flags.initialized) {
1732 device->flags.power_manageable =
1733 device->power.states[ACPI_STATE_D0].flags.valid;
1734 if (acpi_bus_init_power(device))
1735 device->flags.power_manageable = 0;
1737 device->flags.initialized = true;
1739 device->flags.visited = false;
1740 ret = acpi_scan_attach_handler(device);
1744 device->flags.match_driver = true;
1746 ret = device_attach(&device->dev);
1750 if (!ret && device->pnp.type.platform_id)
1751 acpi_default_enumeration(device);
1753 device->flags.visited = true;
1756 list_for_each_entry(child, &device->children, node)
1757 acpi_bus_attach(child);
1759 if (device->handler && device->handler->hotplug.notify_online)
1760 device->handler->hotplug.notify_online(device);
1763 void acpi_walk_dep_device_list(acpi_handle handle)
1765 struct acpi_dep_data *dep, *tmp;
1766 struct acpi_device *adev;
1768 mutex_lock(&acpi_dep_list_lock);
1769 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
1770 if (dep->master == handle) {
1771 acpi_bus_get_device(dep->slave, &adev);
1776 if (!adev->dep_unmet)
1777 acpi_bus_attach(adev);
1778 list_del(&dep->node);
1782 mutex_unlock(&acpi_dep_list_lock);
1784 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
1787 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1788 * @handle: Root of the namespace scope to scan.
1790 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1793 * If no devices were found, -ENODEV is returned, but it does not mean that
1794 * there has been a real error. There just have been no suitable ACPI objects
1795 * in the table trunk from which the kernel could create a device and add an
1796 * appropriate driver.
1798 * Must be called under acpi_scan_lock.
1800 int acpi_bus_scan(acpi_handle handle)
1802 void *device = NULL;
1804 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1805 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1806 acpi_bus_check_add, NULL, NULL, &device);
1809 acpi_bus_attach(device);
1814 EXPORT_SYMBOL(acpi_bus_scan);
1817 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
1818 * @adev: Root of the ACPI namespace scope to walk.
1820 * Must be called under acpi_scan_lock.
1822 void acpi_bus_trim(struct acpi_device *adev)
1824 struct acpi_scan_handler *handler = adev->handler;
1825 struct acpi_device *child;
1827 list_for_each_entry_reverse(child, &adev->children, node)
1828 acpi_bus_trim(child);
1830 adev->flags.match_driver = false;
1832 if (handler->detach)
1833 handler->detach(adev);
1835 adev->handler = NULL;
1837 device_release_driver(&adev->dev);
1840 * Most likely, the device is going away, so put it into D3cold before
1843 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
1844 adev->flags.initialized = false;
1845 adev->flags.visited = false;
1847 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1849 static int acpi_bus_scan_fixed(void)
1854 * Enumerate all fixed-feature devices.
1856 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
1857 struct acpi_device *device = NULL;
1859 result = acpi_add_single_object(&device, NULL,
1860 ACPI_BUS_TYPE_POWER_BUTTON,
1865 device->flags.match_driver = true;
1866 result = device_attach(&device->dev);
1870 device_init_wakeup(&device->dev, true);
1873 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
1874 struct acpi_device *device = NULL;
1876 result = acpi_add_single_object(&device, NULL,
1877 ACPI_BUS_TYPE_SLEEP_BUTTON,
1882 device->flags.match_driver = true;
1883 result = device_attach(&device->dev);
1886 return result < 0 ? result : 0;
1889 int __init acpi_scan_init(void)
1893 acpi_pci_root_init();
1894 acpi_pci_link_init();
1895 acpi_processor_init();
1898 acpi_cmos_rtc_init();
1899 acpi_container_init();
1900 acpi_memory_hotplug_init();
1902 acpi_int340x_thermal_init();
1904 acpi_scan_add_handler(&generic_device_handler);
1906 mutex_lock(&acpi_scan_lock);
1908 * Enumerate devices in the ACPI namespace.
1910 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
1914 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
1918 /* Fixed feature devices do not exist on HW-reduced platform */
1919 if (!acpi_gbl_reduced_hardware) {
1920 result = acpi_bus_scan_fixed();
1922 acpi_detach_data(acpi_root->handle,
1923 acpi_scan_drop_device);
1924 acpi_device_del(acpi_root);
1925 put_device(&acpi_root->dev);
1930 acpi_update_all_gpes();
1933 mutex_unlock(&acpi_scan_lock);