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/acpi_iort.h>
11 #include <linux/signal.h>
12 #include <linux/kthread.h>
13 #include <linux/dmi.h>
14 #include <linux/nls.h>
15 #include <linux/dma-mapping.h>
17 #include <asm/pgtable.h>
21 #define _COMPONENT ACPI_BUS_COMPONENT
22 ACPI_MODULE_NAME("scan");
23 extern struct acpi_device *acpi_root;
25 #define ACPI_BUS_CLASS "system_bus"
26 #define ACPI_BUS_HID "LNXSYBUS"
27 #define ACPI_BUS_DEVICE_NAME "System Bus"
29 #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
31 #define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page)
34 * If set, devices will be hot-removed even if they cannot be put offline
35 * gracefully (from the kernel's standpoint).
37 bool acpi_force_hot_remove;
39 static const char *dummy_hid = "device";
41 static LIST_HEAD(acpi_dep_list);
42 static DEFINE_MUTEX(acpi_dep_list_lock);
43 LIST_HEAD(acpi_bus_id_list);
44 static DEFINE_MUTEX(acpi_scan_lock);
45 static LIST_HEAD(acpi_scan_handlers_list);
46 DEFINE_MUTEX(acpi_device_lock);
47 LIST_HEAD(acpi_wakeup_device_list);
48 static DEFINE_MUTEX(acpi_hp_context_lock);
51 * The UART device described by the SPCR table is the only object which needs
52 * special-casing. Everything else is covered by ACPI namespace paths in STAO
55 static u64 spcr_uart_addr;
57 struct acpi_dep_data {
58 struct list_head node;
63 void acpi_scan_lock_acquire(void)
65 mutex_lock(&acpi_scan_lock);
67 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
69 void acpi_scan_lock_release(void)
71 mutex_unlock(&acpi_scan_lock);
73 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
75 void acpi_lock_hp_context(void)
77 mutex_lock(&acpi_hp_context_lock);
80 void acpi_unlock_hp_context(void)
82 mutex_unlock(&acpi_hp_context_lock);
85 void acpi_initialize_hp_context(struct acpi_device *adev,
86 struct acpi_hotplug_context *hp,
87 int (*notify)(struct acpi_device *, u32),
88 void (*uevent)(struct acpi_device *, u32))
90 acpi_lock_hp_context();
93 acpi_set_hp_context(adev, hp);
94 acpi_unlock_hp_context();
96 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
98 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
103 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
107 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
108 const char *hotplug_profile_name)
112 error = acpi_scan_add_handler(handler);
116 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
120 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
122 struct acpi_device_physical_node *pn;
126 * acpi_container_offline() calls this for all of the container's
127 * children under the container's physical_node_lock lock.
129 mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
131 list_for_each_entry(pn, &adev->physical_node_list, node)
132 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
134 kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
140 mutex_unlock(&adev->physical_node_lock);
144 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
147 struct acpi_device *device = NULL;
148 struct acpi_device_physical_node *pn;
149 bool second_pass = (bool)data;
150 acpi_status status = AE_OK;
152 if (acpi_bus_get_device(handle, &device))
155 if (device->handler && !device->handler->hotplug.enabled) {
156 *ret_p = &device->dev;
160 mutex_lock(&device->physical_node_lock);
162 list_for_each_entry(pn, &device->physical_node_list, node) {
166 /* Skip devices offlined by the first pass. */
170 pn->put_online = false;
172 ret = device_offline(pn->dev);
173 if (acpi_force_hot_remove)
177 pn->put_online = !ret;
187 mutex_unlock(&device->physical_node_lock);
192 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
195 struct acpi_device *device = NULL;
196 struct acpi_device_physical_node *pn;
198 if (acpi_bus_get_device(handle, &device))
201 mutex_lock(&device->physical_node_lock);
203 list_for_each_entry(pn, &device->physical_node_list, node)
204 if (pn->put_online) {
205 device_online(pn->dev);
206 pn->put_online = false;
209 mutex_unlock(&device->physical_node_lock);
214 static int acpi_scan_try_to_offline(struct acpi_device *device)
216 acpi_handle handle = device->handle;
217 struct device *errdev = NULL;
221 * Carry out two passes here and ignore errors in the first pass,
222 * because if the devices in question are memory blocks and
223 * CONFIG_MEMCG is set, one of the blocks may hold data structures
224 * that the other blocks depend on, but it is not known in advance which
227 * If the first pass is successful, the second one isn't needed, though.
229 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
230 NULL, acpi_bus_offline, (void *)false,
232 if (status == AE_SUPPORT) {
233 dev_warn(errdev, "Offline disabled.\n");
234 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
235 acpi_bus_online, NULL, NULL, NULL);
238 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
241 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
242 NULL, acpi_bus_offline, (void *)true,
244 if (!errdev || acpi_force_hot_remove)
245 acpi_bus_offline(handle, 0, (void *)true,
248 if (errdev && !acpi_force_hot_remove) {
249 dev_warn(errdev, "Offline failed.\n");
250 acpi_bus_online(handle, 0, NULL, NULL);
251 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
252 ACPI_UINT32_MAX, acpi_bus_online,
260 static int acpi_scan_hot_remove(struct acpi_device *device)
262 acpi_handle handle = device->handle;
263 unsigned long long sta;
266 if (device->handler && device->handler->hotplug.demand_offline
267 && !acpi_force_hot_remove) {
268 if (!acpi_scan_is_offline(device, true))
271 int error = acpi_scan_try_to_offline(device);
276 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
277 "Hot-removing device %s...\n", dev_name(&device->dev)));
279 acpi_bus_trim(device);
281 acpi_evaluate_lck(handle, 0);
285 status = acpi_evaluate_ej0(handle);
286 if (status == AE_NOT_FOUND)
288 else if (ACPI_FAILURE(status))
292 * Verify if eject was indeed successful. If not, log an error
293 * message. No need to call _OST since _EJ0 call was made OK.
295 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
296 if (ACPI_FAILURE(status)) {
297 acpi_handle_warn(handle,
298 "Status check after eject failed (0x%x)\n", status);
299 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
300 acpi_handle_warn(handle,
301 "Eject incomplete - status 0x%llx\n", sta);
307 static int acpi_scan_device_not_present(struct acpi_device *adev)
309 if (!acpi_device_enumerated(adev)) {
310 dev_warn(&adev->dev, "Still not present\n");
317 static int acpi_scan_device_check(struct acpi_device *adev)
321 acpi_bus_get_status(adev);
322 if (adev->status.present || adev->status.functional) {
324 * This function is only called for device objects for which
325 * matching scan handlers exist. The only situation in which
326 * the scan handler is not attached to this device object yet
327 * is when the device has just appeared (either it wasn't
328 * present at all before or it was removed and then added
332 dev_warn(&adev->dev, "Already enumerated\n");
335 error = acpi_bus_scan(adev->handle);
337 dev_warn(&adev->dev, "Namespace scan failure\n");
340 if (!adev->handler) {
341 dev_warn(&adev->dev, "Enumeration failure\n");
345 error = acpi_scan_device_not_present(adev);
350 static int acpi_scan_bus_check(struct acpi_device *adev)
352 struct acpi_scan_handler *handler = adev->handler;
353 struct acpi_device *child;
356 acpi_bus_get_status(adev);
357 if (!(adev->status.present || adev->status.functional)) {
358 acpi_scan_device_not_present(adev);
361 if (handler && handler->hotplug.scan_dependent)
362 return handler->hotplug.scan_dependent(adev);
364 error = acpi_bus_scan(adev->handle);
366 dev_warn(&adev->dev, "Namespace scan failure\n");
369 list_for_each_entry(child, &adev->children, node) {
370 error = acpi_scan_bus_check(child);
377 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
380 case ACPI_NOTIFY_BUS_CHECK:
381 return acpi_scan_bus_check(adev);
382 case ACPI_NOTIFY_DEVICE_CHECK:
383 return acpi_scan_device_check(adev);
384 case ACPI_NOTIFY_EJECT_REQUEST:
385 case ACPI_OST_EC_OSPM_EJECT:
386 if (adev->handler && !adev->handler->hotplug.enabled) {
387 dev_info(&adev->dev, "Eject disabled\n");
390 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
391 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
392 return acpi_scan_hot_remove(adev);
397 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
399 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
402 lock_device_hotplug();
403 mutex_lock(&acpi_scan_lock);
406 * The device object's ACPI handle cannot become invalid as long as we
407 * are holding acpi_scan_lock, but it might have become invalid before
408 * that lock was acquired.
410 if (adev->handle == INVALID_ACPI_HANDLE)
413 if (adev->flags.is_dock_station) {
414 error = dock_notify(adev, src);
415 } else if (adev->flags.hotplug_notify) {
416 error = acpi_generic_hotplug_event(adev, src);
417 if (error == -EPERM) {
418 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
422 int (*notify)(struct acpi_device *, u32);
424 acpi_lock_hp_context();
425 notify = adev->hp ? adev->hp->notify : NULL;
426 acpi_unlock_hp_context();
428 * There may be additional notify handlers for device objects
429 * without the .event() callback, so ignore them here.
432 error = notify(adev, src);
437 ost_code = ACPI_OST_SC_SUCCESS;
440 acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
443 acpi_bus_put_acpi_device(adev);
444 mutex_unlock(&acpi_scan_lock);
445 unlock_device_hotplug();
448 static void acpi_free_power_resources_lists(struct acpi_device *device)
452 if (device->wakeup.flags.valid)
453 acpi_power_resources_list_free(&device->wakeup.resources);
455 if (!device->power.flags.power_resources)
458 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
459 struct acpi_device_power_state *ps = &device->power.states[i];
460 acpi_power_resources_list_free(&ps->resources);
464 static void acpi_device_release(struct device *dev)
466 struct acpi_device *acpi_dev = to_acpi_device(dev);
468 acpi_free_properties(acpi_dev);
469 acpi_free_pnp_ids(&acpi_dev->pnp);
470 acpi_free_power_resources_lists(acpi_dev);
474 static void acpi_device_del(struct acpi_device *device)
476 struct acpi_device_bus_id *acpi_device_bus_id;
478 mutex_lock(&acpi_device_lock);
480 list_del(&device->node);
482 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
483 if (!strcmp(acpi_device_bus_id->bus_id,
484 acpi_device_hid(device))) {
485 if (acpi_device_bus_id->instance_no > 0)
486 acpi_device_bus_id->instance_no--;
488 list_del(&acpi_device_bus_id->node);
489 kfree(acpi_device_bus_id);
494 list_del(&device->wakeup_list);
495 mutex_unlock(&acpi_device_lock);
497 acpi_power_add_remove_device(device, false);
498 acpi_device_remove_files(device);
500 device->remove(device);
502 device_del(&device->dev);
505 static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
507 static LIST_HEAD(acpi_device_del_list);
508 static DEFINE_MUTEX(acpi_device_del_lock);
510 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
513 struct acpi_device *adev;
515 mutex_lock(&acpi_device_del_lock);
517 if (list_empty(&acpi_device_del_list)) {
518 mutex_unlock(&acpi_device_del_lock);
521 adev = list_first_entry(&acpi_device_del_list,
522 struct acpi_device, del_list);
523 list_del(&adev->del_list);
525 mutex_unlock(&acpi_device_del_lock);
527 blocking_notifier_call_chain(&acpi_reconfig_chain,
528 ACPI_RECONFIG_DEVICE_REMOVE, adev);
530 acpi_device_del(adev);
532 * Drop references to all power resources that might have been
533 * used by the device.
535 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
536 put_device(&adev->dev);
541 * acpi_scan_drop_device - Drop an ACPI device object.
542 * @handle: Handle of an ACPI namespace node, not used.
543 * @context: Address of the ACPI device object to drop.
545 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
546 * namespace node the device object pointed to by @context is attached to.
548 * The unregistration is carried out asynchronously to avoid running
549 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
550 * ensure the correct ordering (the device objects must be unregistered in the
551 * same order in which the corresponding namespace nodes are deleted).
553 static void acpi_scan_drop_device(acpi_handle handle, void *context)
555 static DECLARE_WORK(work, acpi_device_del_work_fn);
556 struct acpi_device *adev = context;
558 mutex_lock(&acpi_device_del_lock);
561 * Use the ACPI hotplug workqueue which is ordered, so this work item
562 * won't run after any hotplug work items submitted subsequently. That
563 * prevents attempts to register device objects identical to those being
564 * deleted from happening concurrently (such attempts result from
565 * hotplug events handled via the ACPI hotplug workqueue). It also will
566 * run after all of the work items submitted previosuly, which helps
567 * those work items to ensure that they are not accessing stale device
570 if (list_empty(&acpi_device_del_list))
571 acpi_queue_hotplug_work(&work);
573 list_add_tail(&adev->del_list, &acpi_device_del_list);
574 /* Make acpi_ns_validate_handle() return NULL for this handle. */
575 adev->handle = INVALID_ACPI_HANDLE;
577 mutex_unlock(&acpi_device_del_lock);
580 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
581 void (*callback)(void *))
588 status = acpi_get_data_full(handle, acpi_scan_drop_device,
589 (void **)device, callback);
590 if (ACPI_FAILURE(status) || !*device) {
591 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
598 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
600 return acpi_get_device_data(handle, device, NULL);
602 EXPORT_SYMBOL(acpi_bus_get_device);
604 static void get_acpi_device(void *dev)
607 get_device(&((struct acpi_device *)dev)->dev);
610 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
612 struct acpi_device *adev = NULL;
614 acpi_get_device_data(handle, &adev, get_acpi_device);
618 void acpi_bus_put_acpi_device(struct acpi_device *adev)
620 put_device(&adev->dev);
623 int acpi_device_add(struct acpi_device *device,
624 void (*release)(struct device *))
627 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
630 if (device->handle) {
633 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
635 if (ACPI_FAILURE(status)) {
636 acpi_handle_err(device->handle,
637 "Unable to attach device data\n");
645 * Link this device to its parent and siblings.
647 INIT_LIST_HEAD(&device->children);
648 INIT_LIST_HEAD(&device->node);
649 INIT_LIST_HEAD(&device->wakeup_list);
650 INIT_LIST_HEAD(&device->physical_node_list);
651 INIT_LIST_HEAD(&device->del_list);
652 mutex_init(&device->physical_node_lock);
654 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
656 pr_err(PREFIX "Memory allocation error\n");
661 mutex_lock(&acpi_device_lock);
663 * Find suitable bus_id and instance number in acpi_bus_id_list
664 * If failed, create one and link it into acpi_bus_id_list
666 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
667 if (!strcmp(acpi_device_bus_id->bus_id,
668 acpi_device_hid(device))) {
669 acpi_device_bus_id->instance_no++;
676 acpi_device_bus_id = new_bus_id;
677 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
678 acpi_device_bus_id->instance_no = 0;
679 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
681 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
684 list_add_tail(&device->node, &device->parent->children);
686 if (device->wakeup.flags.valid)
687 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
688 mutex_unlock(&acpi_device_lock);
691 device->dev.parent = &device->parent->dev;
692 device->dev.bus = &acpi_bus_type;
693 device->dev.release = release;
694 result = device_add(&device->dev);
696 dev_err(&device->dev, "Error registering device\n");
700 result = acpi_device_setup_files(device);
702 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
703 dev_name(&device->dev));
708 mutex_lock(&acpi_device_lock);
710 list_del(&device->node);
711 list_del(&device->wakeup_list);
712 mutex_unlock(&acpi_device_lock);
715 acpi_detach_data(device->handle, acpi_scan_drop_device);
719 /* --------------------------------------------------------------------------
721 -------------------------------------------------------------------------- */
722 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
724 struct acpi_device *device = NULL;
728 * Fixed hardware devices do not appear in the namespace and do not
729 * have handles, but we fabricate acpi_devices for them, so we have
730 * to deal with them specially.
736 status = acpi_get_parent(handle, &handle);
737 if (ACPI_FAILURE(status))
738 return status == AE_NULL_ENTRY ? NULL : acpi_root;
739 } while (acpi_bus_get_device(handle, &device));
744 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
748 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
749 union acpi_object *obj;
751 status = acpi_get_handle(handle, "_EJD", &tmp);
752 if (ACPI_FAILURE(status))
755 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
756 if (ACPI_SUCCESS(status)) {
757 obj = buffer.pointer;
758 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
760 kfree(buffer.pointer);
764 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
766 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
767 struct acpi_device_wakeup *wakeup)
769 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
770 union acpi_object *package = NULL;
771 union acpi_object *element = NULL;
778 INIT_LIST_HEAD(&wakeup->resources);
781 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
782 if (ACPI_FAILURE(status)) {
783 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
787 package = (union acpi_object *)buffer.pointer;
789 if (!package || package->package.count < 2)
792 element = &(package->package.elements[0]);
796 if (element->type == ACPI_TYPE_PACKAGE) {
797 if ((element->package.count < 2) ||
798 (element->package.elements[0].type !=
799 ACPI_TYPE_LOCAL_REFERENCE)
800 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
804 element->package.elements[0].reference.handle;
806 (u32) element->package.elements[1].integer.value;
807 } else if (element->type == ACPI_TYPE_INTEGER) {
808 wakeup->gpe_device = NULL;
809 wakeup->gpe_number = element->integer.value;
814 element = &(package->package.elements[1]);
815 if (element->type != ACPI_TYPE_INTEGER)
818 wakeup->sleep_state = element->integer.value;
820 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
824 if (!list_empty(&wakeup->resources)) {
827 err = acpi_power_wakeup_list_init(&wakeup->resources,
830 acpi_handle_warn(handle, "Retrieving current states "
831 "of wakeup power resources failed\n");
832 acpi_power_resources_list_free(&wakeup->resources);
835 if (sleep_state < wakeup->sleep_state) {
836 acpi_handle_warn(handle, "Overriding _PRW sleep state "
837 "(S%d) by S%d from power resources\n",
838 (int)wakeup->sleep_state, sleep_state);
839 wakeup->sleep_state = sleep_state;
844 kfree(buffer.pointer);
848 static void acpi_wakeup_gpe_init(struct acpi_device *device)
850 static const struct acpi_device_id button_device_ids[] = {
856 struct acpi_device_wakeup *wakeup = &device->wakeup;
858 acpi_event_status event_status;
860 wakeup->flags.notifier_present = 0;
862 /* Power button, Lid switch always enable wakeup */
863 if (!acpi_match_device_ids(device, button_device_ids)) {
864 wakeup->flags.run_wake = 1;
865 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
866 /* Do not use Lid/sleep button for S5 wakeup */
867 if (wakeup->sleep_state == ACPI_STATE_S5)
868 wakeup->sleep_state = ACPI_STATE_S4;
870 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
871 device_set_wakeup_capable(&device->dev, true);
875 acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
877 status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number,
879 if (ACPI_FAILURE(status))
882 wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HAS_HANDLER);
885 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
889 /* Presence of _PRW indicates wake capable */
890 if (!acpi_has_method(device->handle, "_PRW"))
893 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
896 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
900 device->wakeup.flags.valid = 1;
901 device->wakeup.prepare_count = 0;
902 acpi_wakeup_gpe_init(device);
903 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
904 * system for the ACPI device with the _PRW object.
905 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
906 * So it is necessary to call _DSW object first. Only when it is not
907 * present will the _PSW object used.
909 err = acpi_device_sleep_wake(device, 0, 0, 0);
911 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
912 "error in _DSW or _PSW evaluation\n"));
915 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
917 struct acpi_device_power_state *ps = &device->power.states[state];
918 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
919 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
922 INIT_LIST_HEAD(&ps->resources);
924 /* Evaluate "_PRx" to get referenced power resources */
925 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
926 if (ACPI_SUCCESS(status)) {
927 union acpi_object *package = buffer.pointer;
929 if (buffer.length && package
930 && package->type == ACPI_TYPE_PACKAGE
931 && package->package.count) {
932 int err = acpi_extract_power_resources(package, 0,
935 device->power.flags.power_resources = 1;
937 ACPI_FREE(buffer.pointer);
940 /* Evaluate "_PSx" to see if we can do explicit sets */
942 if (acpi_has_method(device->handle, pathname))
943 ps->flags.explicit_set = 1;
945 /* State is valid if there are means to put the device into it. */
946 if (!list_empty(&ps->resources) || ps->flags.explicit_set)
949 ps->power = -1; /* Unknown - driver assigned */
950 ps->latency = -1; /* Unknown - driver assigned */
953 static void acpi_bus_get_power_flags(struct acpi_device *device)
957 /* Presence of _PS0|_PR0 indicates 'power manageable' */
958 if (!acpi_has_method(device->handle, "_PS0") &&
959 !acpi_has_method(device->handle, "_PR0"))
962 device->flags.power_manageable = 1;
965 * Power Management Flags
967 if (acpi_has_method(device->handle, "_PSC"))
968 device->power.flags.explicit_get = 1;
970 if (acpi_has_method(device->handle, "_IRC"))
971 device->power.flags.inrush_current = 1;
973 if (acpi_has_method(device->handle, "_DSW"))
974 device->power.flags.dsw_present = 1;
977 * Enumerate supported power management states
979 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
980 acpi_bus_init_power_state(device, i);
982 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
983 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
984 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
986 /* Set defaults for D0 and D3hot states (always valid) */
987 device->power.states[ACPI_STATE_D0].flags.valid = 1;
988 device->power.states[ACPI_STATE_D0].power = 100;
989 device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
991 if (acpi_bus_init_power(device))
992 device->flags.power_manageable = 0;
995 static void acpi_bus_get_flags(struct acpi_device *device)
997 /* Presence of _STA indicates 'dynamic_status' */
998 if (acpi_has_method(device->handle, "_STA"))
999 device->flags.dynamic_status = 1;
1001 /* Presence of _RMV indicates 'removable' */
1002 if (acpi_has_method(device->handle, "_RMV"))
1003 device->flags.removable = 1;
1005 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1006 if (acpi_has_method(device->handle, "_EJD") ||
1007 acpi_has_method(device->handle, "_EJ0"))
1008 device->flags.ejectable = 1;
1011 static void acpi_device_get_busid(struct acpi_device *device)
1013 char bus_id[5] = { '?', 0 };
1014 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1020 * The device's Bus ID is simply the object name.
1021 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1023 if (ACPI_IS_ROOT_DEVICE(device)) {
1024 strcpy(device->pnp.bus_id, "ACPI");
1028 switch (device->device_type) {
1029 case ACPI_BUS_TYPE_POWER_BUTTON:
1030 strcpy(device->pnp.bus_id, "PWRF");
1032 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1033 strcpy(device->pnp.bus_id, "SLPF");
1036 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1037 /* Clean up trailing underscores (if any) */
1038 for (i = 3; i > 1; i--) {
1039 if (bus_id[i] == '_')
1044 strcpy(device->pnp.bus_id, bus_id);
1050 * acpi_ata_match - see if an acpi object is an ATA device
1052 * If an acpi object has one of the ACPI ATA methods defined,
1053 * then we can safely call it an ATA device.
1055 bool acpi_ata_match(acpi_handle handle)
1057 return acpi_has_method(handle, "_GTF") ||
1058 acpi_has_method(handle, "_GTM") ||
1059 acpi_has_method(handle, "_STM") ||
1060 acpi_has_method(handle, "_SDD");
1064 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1066 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1067 * then we can safely call it an ejectable drive bay
1069 bool acpi_bay_match(acpi_handle handle)
1071 acpi_handle phandle;
1073 if (!acpi_has_method(handle, "_EJ0"))
1075 if (acpi_ata_match(handle))
1077 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1080 return acpi_ata_match(phandle);
1083 bool acpi_device_is_battery(struct acpi_device *adev)
1085 struct acpi_hardware_id *hwid;
1087 list_for_each_entry(hwid, &adev->pnp.ids, list)
1088 if (!strcmp("PNP0C0A", hwid->id))
1094 static bool is_ejectable_bay(struct acpi_device *adev)
1096 acpi_handle handle = adev->handle;
1098 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1101 return acpi_bay_match(handle);
1105 * acpi_dock_match - see if an acpi object has a _DCK method
1107 bool acpi_dock_match(acpi_handle handle)
1109 return acpi_has_method(handle, "_DCK");
1113 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1114 void **return_value)
1116 long *cap = context;
1118 if (acpi_has_method(handle, "_BCM") &&
1119 acpi_has_method(handle, "_BCL")) {
1120 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
1122 *cap |= ACPI_VIDEO_BACKLIGHT;
1123 if (!acpi_has_method(handle, "_BQC"))
1124 printk(KERN_WARNING FW_BUG PREFIX "No _BQC method, "
1125 "cannot determine initial brightness\n");
1126 /* We have backlight support, no need to scan further */
1127 return AE_CTRL_TERMINATE;
1132 /* Returns true if the ACPI object is a video device which can be
1133 * handled by video.ko.
1134 * The device will get a Linux specific CID added in scan.c to
1135 * identify the device as an ACPI graphics device
1136 * Be aware that the graphics device may not be physically present
1137 * Use acpi_video_get_capabilities() to detect general ACPI video
1138 * capabilities of present cards
1140 long acpi_is_video_device(acpi_handle handle)
1142 long video_caps = 0;
1144 /* Is this device able to support video switching ? */
1145 if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1146 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1148 /* Is this device able to retrieve a video ROM ? */
1149 if (acpi_has_method(handle, "_ROM"))
1150 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1152 /* Is this device able to configure which video head to be POSTed ? */
1153 if (acpi_has_method(handle, "_VPO") &&
1154 acpi_has_method(handle, "_GPD") &&
1155 acpi_has_method(handle, "_SPD"))
1156 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1158 /* Only check for backlight functionality if one of the above hit. */
1160 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1161 ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1166 EXPORT_SYMBOL(acpi_is_video_device);
1168 const char *acpi_device_hid(struct acpi_device *device)
1170 struct acpi_hardware_id *hid;
1172 if (list_empty(&device->pnp.ids))
1175 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1178 EXPORT_SYMBOL(acpi_device_hid);
1180 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1182 struct acpi_hardware_id *id;
1184 id = kmalloc(sizeof(*id), GFP_KERNEL);
1188 id->id = kstrdup_const(dev_id, GFP_KERNEL);
1194 list_add_tail(&id->list, &pnp->ids);
1195 pnp->type.hardware_id = 1;
1199 * Old IBM workstations have a DSDT bug wherein the SMBus object
1200 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1201 * prefix. Work around this.
1203 static bool acpi_ibm_smbus_match(acpi_handle handle)
1205 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1206 struct acpi_buffer path = { sizeof(node_name), node_name };
1208 if (!dmi_name_in_vendors("IBM"))
1211 /* Look for SMBS object */
1212 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1213 strcmp("SMBS", path.pointer))
1216 /* Does it have the necessary (but misnamed) methods? */
1217 if (acpi_has_method(handle, "SBI") &&
1218 acpi_has_method(handle, "SBR") &&
1219 acpi_has_method(handle, "SBW"))
1225 static bool acpi_object_is_system_bus(acpi_handle handle)
1229 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1232 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1239 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1243 struct acpi_device_info *info;
1244 struct acpi_pnp_device_id_list *cid_list;
1247 switch (device_type) {
1248 case ACPI_BUS_TYPE_DEVICE:
1249 if (handle == ACPI_ROOT_OBJECT) {
1250 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1254 status = acpi_get_object_info(handle, &info);
1255 if (ACPI_FAILURE(status)) {
1256 pr_err(PREFIX "%s: Error reading device info\n",
1261 if (info->valid & ACPI_VALID_HID) {
1262 acpi_add_id(pnp, info->hardware_id.string);
1263 pnp->type.platform_id = 1;
1265 if (info->valid & ACPI_VALID_CID) {
1266 cid_list = &info->compatible_id_list;
1267 for (i = 0; i < cid_list->count; i++)
1268 acpi_add_id(pnp, cid_list->ids[i].string);
1270 if (info->valid & ACPI_VALID_ADR) {
1271 pnp->bus_address = info->address;
1272 pnp->type.bus_address = 1;
1274 if (info->valid & ACPI_VALID_UID)
1275 pnp->unique_id = kstrdup(info->unique_id.string,
1277 if (info->valid & ACPI_VALID_CLS)
1278 acpi_add_id(pnp, info->class_code.string);
1283 * Some devices don't reliably have _HIDs & _CIDs, so add
1284 * synthetic HIDs to make sure drivers can find them.
1286 if (acpi_is_video_device(handle))
1287 acpi_add_id(pnp, ACPI_VIDEO_HID);
1288 else if (acpi_bay_match(handle))
1289 acpi_add_id(pnp, ACPI_BAY_HID);
1290 else if (acpi_dock_match(handle))
1291 acpi_add_id(pnp, ACPI_DOCK_HID);
1292 else if (acpi_ibm_smbus_match(handle))
1293 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1294 else if (list_empty(&pnp->ids) &&
1295 acpi_object_is_system_bus(handle)) {
1296 /* \_SB, \_TZ, LNXSYBUS */
1297 acpi_add_id(pnp, ACPI_BUS_HID);
1298 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1299 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1303 case ACPI_BUS_TYPE_POWER:
1304 acpi_add_id(pnp, ACPI_POWER_HID);
1306 case ACPI_BUS_TYPE_PROCESSOR:
1307 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1309 case ACPI_BUS_TYPE_THERMAL:
1310 acpi_add_id(pnp, ACPI_THERMAL_HID);
1312 case ACPI_BUS_TYPE_POWER_BUTTON:
1313 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1315 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1316 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1321 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1323 struct acpi_hardware_id *id, *tmp;
1325 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1326 kfree_const(id->id);
1329 kfree(pnp->unique_id);
1333 * acpi_dma_supported - Check DMA support for the specified device.
1334 * @adev: The pointer to acpi device
1336 * Return false if DMA is not supported. Otherwise, return true
1338 bool acpi_dma_supported(struct acpi_device *adev)
1343 if (adev->flags.cca_seen)
1347 * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1348 * DMA on "Intel platforms". Presumably that includes all x86 and
1349 * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1351 if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1358 * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1359 * @adev: The pointer to acpi device
1361 * Return enum dev_dma_attr.
1363 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1365 if (!acpi_dma_supported(adev))
1366 return DEV_DMA_NOT_SUPPORTED;
1368 if (adev->flags.coherent_dma)
1369 return DEV_DMA_COHERENT;
1371 return DEV_DMA_NON_COHERENT;
1375 * acpi_dma_configure - Set-up DMA configuration for the device.
1376 * @dev: The pointer to the device
1377 * @attr: device dma attributes
1379 void acpi_dma_configure(struct device *dev, enum dev_dma_attr attr)
1381 const struct iommu_ops *iommu;
1383 iort_set_dma_mask(dev);
1385 iommu = iort_iommu_configure(dev);
1388 * Assume dma valid range starts at 0 and covers the whole
1389 * coherent_dma_mask.
1391 arch_setup_dma_ops(dev, 0, dev->coherent_dma_mask + 1, iommu,
1392 attr == DEV_DMA_COHERENT);
1394 EXPORT_SYMBOL_GPL(acpi_dma_configure);
1397 * acpi_dma_deconfigure - Tear-down DMA configuration for the device.
1398 * @dev: The pointer to the device
1400 void acpi_dma_deconfigure(struct device *dev)
1402 arch_teardown_dma_ops(dev);
1404 EXPORT_SYMBOL_GPL(acpi_dma_deconfigure);
1406 static void acpi_init_coherency(struct acpi_device *adev)
1408 unsigned long long cca = 0;
1410 struct acpi_device *parent = adev->parent;
1412 if (parent && parent->flags.cca_seen) {
1414 * From ACPI spec, OSPM will ignore _CCA if an ancestor
1417 adev->flags.cca_seen = 1;
1418 cca = parent->flags.coherent_dma;
1420 status = acpi_evaluate_integer(adev->handle, "_CCA",
1422 if (ACPI_SUCCESS(status))
1423 adev->flags.cca_seen = 1;
1424 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1426 * If architecture does not specify that _CCA is
1427 * required for DMA-able devices (e.g. x86),
1428 * we default to _CCA=1.
1432 acpi_handle_debug(adev->handle,
1433 "ACPI device is missing _CCA.\n");
1436 adev->flags.coherent_dma = cca;
1439 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1440 int type, unsigned long long sta)
1442 INIT_LIST_HEAD(&device->pnp.ids);
1443 device->device_type = type;
1444 device->handle = handle;
1445 device->parent = acpi_bus_get_parent(handle);
1446 device->fwnode.type = FWNODE_ACPI;
1447 acpi_set_device_status(device, sta);
1448 acpi_device_get_busid(device);
1449 acpi_set_pnp_ids(handle, &device->pnp, type);
1450 acpi_init_properties(device);
1451 acpi_bus_get_flags(device);
1452 device->flags.match_driver = false;
1453 device->flags.initialized = true;
1454 acpi_device_clear_enumerated(device);
1455 device_initialize(&device->dev);
1456 dev_set_uevent_suppress(&device->dev, true);
1457 acpi_init_coherency(device);
1460 void acpi_device_add_finalize(struct acpi_device *device)
1462 dev_set_uevent_suppress(&device->dev, false);
1463 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1466 static int acpi_add_single_object(struct acpi_device **child,
1467 acpi_handle handle, int type,
1468 unsigned long long sta)
1471 struct acpi_device *device;
1472 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1474 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1476 printk(KERN_ERR PREFIX "Memory allocation error\n");
1480 acpi_init_device_object(device, handle, type, sta);
1481 acpi_bus_get_power_flags(device);
1482 acpi_bus_get_wakeup_device_flags(device);
1484 result = acpi_device_add(device, acpi_device_release);
1486 acpi_device_release(&device->dev);
1490 acpi_power_add_remove_device(device, true);
1491 acpi_device_add_finalize(device);
1492 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1493 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1494 dev_name(&device->dev), (char *) buffer.pointer,
1495 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1496 kfree(buffer.pointer);
1501 static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1504 struct resource *res = context;
1506 if (acpi_dev_resource_memory(ares, res))
1507 return AE_CTRL_TERMINATE;
1512 static bool acpi_device_should_be_hidden(acpi_handle handle)
1515 struct resource res;
1517 /* Check if it should ignore the UART device */
1518 if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1522 * The UART device described in SPCR table is assumed to have only one
1523 * memory resource present. So we only look for the first one here.
1525 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1526 acpi_get_resource_memory, &res);
1527 if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1530 acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1536 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1537 unsigned long long *sta)
1540 acpi_object_type acpi_type;
1542 status = acpi_get_type(handle, &acpi_type);
1543 if (ACPI_FAILURE(status))
1546 switch (acpi_type) {
1547 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1548 case ACPI_TYPE_DEVICE:
1549 if (acpi_device_should_be_hidden(handle))
1552 *type = ACPI_BUS_TYPE_DEVICE;
1553 status = acpi_bus_get_status_handle(handle, sta);
1554 if (ACPI_FAILURE(status))
1557 case ACPI_TYPE_PROCESSOR:
1558 *type = ACPI_BUS_TYPE_PROCESSOR;
1559 status = acpi_bus_get_status_handle(handle, sta);
1560 if (ACPI_FAILURE(status))
1563 case ACPI_TYPE_THERMAL:
1564 *type = ACPI_BUS_TYPE_THERMAL;
1565 *sta = ACPI_STA_DEFAULT;
1567 case ACPI_TYPE_POWER:
1568 *type = ACPI_BUS_TYPE_POWER;
1569 *sta = ACPI_STA_DEFAULT;
1578 bool acpi_device_is_present(struct acpi_device *adev)
1580 if (adev->status.present || adev->status.functional)
1583 adev->flags.initialized = false;
1587 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1589 const struct acpi_device_id **matchid)
1591 const struct acpi_device_id *devid;
1594 return handler->match(idstr, matchid);
1596 for (devid = handler->ids; devid->id[0]; devid++)
1597 if (!strcmp((char *)devid->id, idstr)) {
1607 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1608 const struct acpi_device_id **matchid)
1610 struct acpi_scan_handler *handler;
1612 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1613 if (acpi_scan_handler_matching(handler, idstr, matchid))
1619 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1621 if (!!hotplug->enabled == !!val)
1624 mutex_lock(&acpi_scan_lock);
1626 hotplug->enabled = val;
1628 mutex_unlock(&acpi_scan_lock);
1631 static void acpi_scan_init_hotplug(struct acpi_device *adev)
1633 struct acpi_hardware_id *hwid;
1635 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1636 acpi_dock_add(adev);
1639 list_for_each_entry(hwid, &adev->pnp.ids, list) {
1640 struct acpi_scan_handler *handler;
1642 handler = acpi_scan_match_handler(hwid->id, NULL);
1644 adev->flags.hotplug_notify = true;
1650 static void acpi_device_dep_initialize(struct acpi_device *adev)
1652 struct acpi_dep_data *dep;
1653 struct acpi_handle_list dep_devices;
1657 if (!acpi_has_method(adev->handle, "_DEP"))
1660 status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
1662 if (ACPI_FAILURE(status)) {
1663 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
1667 for (i = 0; i < dep_devices.count; i++) {
1668 struct acpi_device_info *info;
1671 status = acpi_get_object_info(dep_devices.handles[i], &info);
1672 if (ACPI_FAILURE(status)) {
1673 dev_dbg(&adev->dev, "Error reading _DEP device info\n");
1678 * Skip the dependency of Windows System Power
1679 * Management Controller
1681 skip = info->valid & ACPI_VALID_HID &&
1682 !strcmp(info->hardware_id.string, "INT3396");
1689 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
1693 dep->master = dep_devices.handles[i];
1694 dep->slave = adev->handle;
1697 mutex_lock(&acpi_dep_list_lock);
1698 list_add_tail(&dep->node , &acpi_dep_list);
1699 mutex_unlock(&acpi_dep_list_lock);
1703 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1704 void *not_used, void **return_value)
1706 struct acpi_device *device = NULL;
1708 unsigned long long sta;
1711 acpi_bus_get_device(handle, &device);
1715 result = acpi_bus_type_and_status(handle, &type, &sta);
1719 if (type == ACPI_BUS_TYPE_POWER) {
1720 acpi_add_power_resource(handle);
1724 acpi_add_single_object(&device, handle, type, sta);
1726 return AE_CTRL_DEPTH;
1728 acpi_scan_init_hotplug(device);
1729 acpi_device_dep_initialize(device);
1733 *return_value = device;
1738 static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
1740 bool *is_spi_i2c_slave_p = data;
1742 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1746 * devices that are connected to UART still need to be enumerated to
1749 if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
1750 *is_spi_i2c_slave_p = true;
1752 /* no need to do more checking */
1756 static void acpi_default_enumeration(struct acpi_device *device)
1758 struct list_head resource_list;
1759 bool is_spi_i2c_slave = false;
1762 * Do not enumerate SPI/I2C slaves as they will be enumerated by their
1763 * respective parents.
1765 INIT_LIST_HEAD(&resource_list);
1766 acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
1768 acpi_dev_free_resource_list(&resource_list);
1769 if (!is_spi_i2c_slave) {
1770 acpi_create_platform_device(device, NULL);
1771 acpi_device_set_enumerated(device);
1773 blocking_notifier_call_chain(&acpi_reconfig_chain,
1774 ACPI_RECONFIG_DEVICE_ADD, device);
1778 static const struct acpi_device_id generic_device_ids[] = {
1779 {ACPI_DT_NAMESPACE_HID, },
1783 static int acpi_generic_device_attach(struct acpi_device *adev,
1784 const struct acpi_device_id *not_used)
1787 * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
1788 * below can be unconditional.
1790 if (adev->data.of_compatible)
1791 acpi_default_enumeration(adev);
1796 static struct acpi_scan_handler generic_device_handler = {
1797 .ids = generic_device_ids,
1798 .attach = acpi_generic_device_attach,
1801 static int acpi_scan_attach_handler(struct acpi_device *device)
1803 struct acpi_hardware_id *hwid;
1806 list_for_each_entry(hwid, &device->pnp.ids, list) {
1807 const struct acpi_device_id *devid;
1808 struct acpi_scan_handler *handler;
1810 handler = acpi_scan_match_handler(hwid->id, &devid);
1812 if (!handler->attach) {
1813 device->pnp.type.platform_id = 0;
1816 device->handler = handler;
1817 ret = handler->attach(device, devid);
1821 device->handler = NULL;
1830 static void acpi_bus_attach(struct acpi_device *device)
1832 struct acpi_device *child;
1836 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
1837 register_dock_dependent_device(device, ejd);
1839 acpi_bus_get_status(device);
1840 /* Skip devices that are not present. */
1841 if (!acpi_device_is_present(device)) {
1842 acpi_device_clear_enumerated(device);
1843 device->flags.power_manageable = 0;
1846 if (device->handler)
1849 if (!device->flags.initialized) {
1850 device->flags.power_manageable =
1851 device->power.states[ACPI_STATE_D0].flags.valid;
1852 if (acpi_bus_init_power(device))
1853 device->flags.power_manageable = 0;
1855 device->flags.initialized = true;
1858 ret = acpi_scan_attach_handler(device);
1862 device->flags.match_driver = true;
1864 ret = device_attach(&device->dev);
1868 if (!ret && device->pnp.type.platform_id)
1869 acpi_default_enumeration(device);
1873 list_for_each_entry(child, &device->children, node)
1874 acpi_bus_attach(child);
1876 if (device->handler && device->handler->hotplug.notify_online)
1877 device->handler->hotplug.notify_online(device);
1880 void acpi_walk_dep_device_list(acpi_handle handle)
1882 struct acpi_dep_data *dep, *tmp;
1883 struct acpi_device *adev;
1885 mutex_lock(&acpi_dep_list_lock);
1886 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
1887 if (dep->master == handle) {
1888 acpi_bus_get_device(dep->slave, &adev);
1893 if (!adev->dep_unmet)
1894 acpi_bus_attach(adev);
1895 list_del(&dep->node);
1899 mutex_unlock(&acpi_dep_list_lock);
1901 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
1904 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1905 * @handle: Root of the namespace scope to scan.
1907 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1910 * If no devices were found, -ENODEV is returned, but it does not mean that
1911 * there has been a real error. There just have been no suitable ACPI objects
1912 * in the table trunk from which the kernel could create a device and add an
1913 * appropriate driver.
1915 * Must be called under acpi_scan_lock.
1917 int acpi_bus_scan(acpi_handle handle)
1919 void *device = NULL;
1921 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1922 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1923 acpi_bus_check_add, NULL, NULL, &device);
1926 acpi_bus_attach(device);
1931 EXPORT_SYMBOL(acpi_bus_scan);
1934 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
1935 * @adev: Root of the ACPI namespace scope to walk.
1937 * Must be called under acpi_scan_lock.
1939 void acpi_bus_trim(struct acpi_device *adev)
1941 struct acpi_scan_handler *handler = adev->handler;
1942 struct acpi_device *child;
1944 list_for_each_entry_reverse(child, &adev->children, node)
1945 acpi_bus_trim(child);
1947 adev->flags.match_driver = false;
1949 if (handler->detach)
1950 handler->detach(adev);
1952 adev->handler = NULL;
1954 device_release_driver(&adev->dev);
1957 * Most likely, the device is going away, so put it into D3cold before
1960 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
1961 adev->flags.initialized = false;
1962 acpi_device_clear_enumerated(adev);
1964 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1966 static int acpi_bus_scan_fixed(void)
1971 * Enumerate all fixed-feature devices.
1973 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
1974 struct acpi_device *device = NULL;
1976 result = acpi_add_single_object(&device, NULL,
1977 ACPI_BUS_TYPE_POWER_BUTTON,
1982 device->flags.match_driver = true;
1983 result = device_attach(&device->dev);
1987 device_init_wakeup(&device->dev, true);
1990 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
1991 struct acpi_device *device = NULL;
1993 result = acpi_add_single_object(&device, NULL,
1994 ACPI_BUS_TYPE_SLEEP_BUTTON,
1999 device->flags.match_driver = true;
2000 result = device_attach(&device->dev);
2003 return result < 0 ? result : 0;
2006 static void __init acpi_get_spcr_uart_addr(void)
2009 struct acpi_table_spcr *spcr_ptr;
2011 status = acpi_get_table(ACPI_SIG_SPCR, 0,
2012 (struct acpi_table_header **)&spcr_ptr);
2013 if (ACPI_SUCCESS(status))
2014 spcr_uart_addr = spcr_ptr->serial_port.address;
2016 printk(KERN_WARNING PREFIX "STAO table present, but SPCR is missing\n");
2019 static bool acpi_scan_initialized;
2021 int __init acpi_scan_init(void)
2025 struct acpi_table_stao *stao_ptr;
2027 acpi_pci_root_init();
2028 acpi_pci_link_init();
2029 acpi_processor_init();
2032 acpi_cmos_rtc_init();
2033 acpi_container_init();
2034 acpi_memory_hotplug_init();
2036 acpi_int340x_thermal_init();
2038 acpi_watchdog_init();
2040 acpi_scan_add_handler(&generic_device_handler);
2043 * If there is STAO table, check whether it needs to ignore the UART
2044 * device in SPCR table.
2046 status = acpi_get_table(ACPI_SIG_STAO, 0,
2047 (struct acpi_table_header **)&stao_ptr);
2048 if (ACPI_SUCCESS(status)) {
2049 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2050 printk(KERN_INFO PREFIX "STAO Name List not yet supported.");
2052 if (stao_ptr->ignore_uart)
2053 acpi_get_spcr_uart_addr();
2056 mutex_lock(&acpi_scan_lock);
2058 * Enumerate devices in the ACPI namespace.
2060 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2064 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2068 /* Fixed feature devices do not exist on HW-reduced platform */
2069 if (!acpi_gbl_reduced_hardware) {
2070 result = acpi_bus_scan_fixed();
2072 acpi_detach_data(acpi_root->handle,
2073 acpi_scan_drop_device);
2074 acpi_device_del(acpi_root);
2075 put_device(&acpi_root->dev);
2080 acpi_update_all_gpes();
2081 acpi_ec_ecdt_start();
2083 acpi_scan_initialized = true;
2086 mutex_unlock(&acpi_scan_lock);
2090 static struct acpi_probe_entry *ape;
2091 static int acpi_probe_count;
2092 static DEFINE_MUTEX(acpi_probe_mutex);
2094 static int __init acpi_match_madt(struct acpi_subtable_header *header,
2095 const unsigned long end)
2097 if (!ape->subtable_valid || ape->subtable_valid(header, ape))
2098 if (!ape->probe_subtbl(header, end))
2104 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2111 mutex_lock(&acpi_probe_mutex);
2112 for (ape = ap_head; nr; ape++, nr--) {
2113 if (ACPI_COMPARE_NAME(ACPI_SIG_MADT, ape->id)) {
2114 acpi_probe_count = 0;
2115 acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2116 count += acpi_probe_count;
2119 res = acpi_table_parse(ape->id, ape->probe_table);
2124 mutex_unlock(&acpi_probe_mutex);
2129 struct acpi_table_events_work {
2130 struct work_struct work;
2135 static void acpi_table_events_fn(struct work_struct *work)
2137 struct acpi_table_events_work *tew;
2139 tew = container_of(work, struct acpi_table_events_work, work);
2141 if (tew->event == ACPI_TABLE_EVENT_LOAD) {
2142 acpi_scan_lock_acquire();
2143 acpi_bus_scan(ACPI_ROOT_OBJECT);
2144 acpi_scan_lock_release();
2150 void acpi_scan_table_handler(u32 event, void *table, void *context)
2152 struct acpi_table_events_work *tew;
2154 if (!acpi_scan_initialized)
2157 if (event != ACPI_TABLE_EVENT_LOAD)
2160 tew = kmalloc(sizeof(*tew), GFP_KERNEL);
2164 INIT_WORK(&tew->work, acpi_table_events_fn);
2168 schedule_work(&tew->work);
2171 int acpi_reconfig_notifier_register(struct notifier_block *nb)
2173 return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2175 EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2177 int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2179 return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2181 EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);