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 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);
50 * The UART device described by the SPCR table is the only object which needs
51 * special-casing. Everything else is covered by ACPI namespace paths in STAO
54 static u64 spcr_uart_addr;
56 struct acpi_dep_data {
57 struct list_head node;
62 void acpi_scan_lock_acquire(void)
64 mutex_lock(&acpi_scan_lock);
66 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
68 void acpi_scan_lock_release(void)
70 mutex_unlock(&acpi_scan_lock);
72 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
74 void acpi_lock_hp_context(void)
76 mutex_lock(&acpi_hp_context_lock);
79 void acpi_unlock_hp_context(void)
81 mutex_unlock(&acpi_hp_context_lock);
84 void acpi_initialize_hp_context(struct acpi_device *adev,
85 struct acpi_hotplug_context *hp,
86 int (*notify)(struct acpi_device *, u32),
87 void (*uevent)(struct acpi_device *, u32))
89 acpi_lock_hp_context();
92 acpi_set_hp_context(adev, hp);
93 acpi_unlock_hp_context();
95 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
97 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
102 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
106 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
107 const char *hotplug_profile_name)
111 error = acpi_scan_add_handler(handler);
115 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
119 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
121 struct acpi_device_physical_node *pn;
125 * acpi_container_offline() calls this for all of the container's
126 * children under the container's physical_node_lock lock.
128 mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
130 list_for_each_entry(pn, &adev->physical_node_list, node)
131 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
133 kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
139 mutex_unlock(&adev->physical_node_lock);
143 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
146 struct acpi_device *device = NULL;
147 struct acpi_device_physical_node *pn;
148 bool second_pass = (bool)data;
149 acpi_status status = AE_OK;
151 if (acpi_bus_get_device(handle, &device))
154 if (device->handler && !device->handler->hotplug.enabled) {
155 *ret_p = &device->dev;
159 mutex_lock(&device->physical_node_lock);
161 list_for_each_entry(pn, &device->physical_node_list, node) {
165 /* Skip devices offlined by the first pass. */
169 pn->put_online = false;
171 ret = device_offline(pn->dev);
172 if (acpi_force_hot_remove)
176 pn->put_online = !ret;
186 mutex_unlock(&device->physical_node_lock);
191 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
194 struct acpi_device *device = NULL;
195 struct acpi_device_physical_node *pn;
197 if (acpi_bus_get_device(handle, &device))
200 mutex_lock(&device->physical_node_lock);
202 list_for_each_entry(pn, &device->physical_node_list, node)
203 if (pn->put_online) {
204 device_online(pn->dev);
205 pn->put_online = false;
208 mutex_unlock(&device->physical_node_lock);
213 static int acpi_scan_try_to_offline(struct acpi_device *device)
215 acpi_handle handle = device->handle;
216 struct device *errdev = NULL;
220 * Carry out two passes here and ignore errors in the first pass,
221 * because if the devices in question are memory blocks and
222 * CONFIG_MEMCG is set, one of the blocks may hold data structures
223 * that the other blocks depend on, but it is not known in advance which
226 * If the first pass is successful, the second one isn't needed, though.
228 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
229 NULL, acpi_bus_offline, (void *)false,
231 if (status == AE_SUPPORT) {
232 dev_warn(errdev, "Offline disabled.\n");
233 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
234 acpi_bus_online, NULL, NULL, NULL);
237 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
240 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
241 NULL, acpi_bus_offline, (void *)true,
243 if (!errdev || acpi_force_hot_remove)
244 acpi_bus_offline(handle, 0, (void *)true,
247 if (errdev && !acpi_force_hot_remove) {
248 dev_warn(errdev, "Offline failed.\n");
249 acpi_bus_online(handle, 0, NULL, NULL);
250 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
251 ACPI_UINT32_MAX, acpi_bus_online,
259 static int acpi_scan_hot_remove(struct acpi_device *device)
261 acpi_handle handle = device->handle;
262 unsigned long long sta;
265 if (device->handler && device->handler->hotplug.demand_offline
266 && !acpi_force_hot_remove) {
267 if (!acpi_scan_is_offline(device, true))
270 int error = acpi_scan_try_to_offline(device);
275 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
276 "Hot-removing device %s...\n", dev_name(&device->dev)));
278 acpi_bus_trim(device);
280 acpi_evaluate_lck(handle, 0);
284 status = acpi_evaluate_ej0(handle);
285 if (status == AE_NOT_FOUND)
287 else if (ACPI_FAILURE(status))
291 * Verify if eject was indeed successful. If not, log an error
292 * message. No need to call _OST since _EJ0 call was made OK.
294 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
295 if (ACPI_FAILURE(status)) {
296 acpi_handle_warn(handle,
297 "Status check after eject failed (0x%x)\n", status);
298 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
299 acpi_handle_warn(handle,
300 "Eject incomplete - status 0x%llx\n", sta);
306 static int acpi_scan_device_not_present(struct acpi_device *adev)
308 if (!acpi_device_enumerated(adev)) {
309 dev_warn(&adev->dev, "Still not present\n");
316 static int acpi_scan_device_check(struct acpi_device *adev)
320 acpi_bus_get_status(adev);
321 if (adev->status.present || adev->status.functional) {
323 * This function is only called for device objects for which
324 * matching scan handlers exist. The only situation in which
325 * the scan handler is not attached to this device object yet
326 * is when the device has just appeared (either it wasn't
327 * present at all before or it was removed and then added
331 dev_warn(&adev->dev, "Already enumerated\n");
334 error = acpi_bus_scan(adev->handle);
336 dev_warn(&adev->dev, "Namespace scan failure\n");
339 if (!adev->handler) {
340 dev_warn(&adev->dev, "Enumeration failure\n");
344 error = acpi_scan_device_not_present(adev);
349 static int acpi_scan_bus_check(struct acpi_device *adev)
351 struct acpi_scan_handler *handler = adev->handler;
352 struct acpi_device *child;
355 acpi_bus_get_status(adev);
356 if (!(adev->status.present || adev->status.functional)) {
357 acpi_scan_device_not_present(adev);
360 if (handler && handler->hotplug.scan_dependent)
361 return handler->hotplug.scan_dependent(adev);
363 error = acpi_bus_scan(adev->handle);
365 dev_warn(&adev->dev, "Namespace scan failure\n");
368 list_for_each_entry(child, &adev->children, node) {
369 error = acpi_scan_bus_check(child);
376 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
379 case ACPI_NOTIFY_BUS_CHECK:
380 return acpi_scan_bus_check(adev);
381 case ACPI_NOTIFY_DEVICE_CHECK:
382 return acpi_scan_device_check(adev);
383 case ACPI_NOTIFY_EJECT_REQUEST:
384 case ACPI_OST_EC_OSPM_EJECT:
385 if (adev->handler && !adev->handler->hotplug.enabled) {
386 dev_info(&adev->dev, "Eject disabled\n");
389 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
390 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
391 return acpi_scan_hot_remove(adev);
396 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
398 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
401 lock_device_hotplug();
402 mutex_lock(&acpi_scan_lock);
405 * The device object's ACPI handle cannot become invalid as long as we
406 * are holding acpi_scan_lock, but it might have become invalid before
407 * that lock was acquired.
409 if (adev->handle == INVALID_ACPI_HANDLE)
412 if (adev->flags.is_dock_station) {
413 error = dock_notify(adev, src);
414 } else if (adev->flags.hotplug_notify) {
415 error = acpi_generic_hotplug_event(adev, src);
416 if (error == -EPERM) {
417 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
421 int (*notify)(struct acpi_device *, u32);
423 acpi_lock_hp_context();
424 notify = adev->hp ? adev->hp->notify : NULL;
425 acpi_unlock_hp_context();
427 * There may be additional notify handlers for device objects
428 * without the .event() callback, so ignore them here.
431 error = notify(adev, src);
436 ost_code = ACPI_OST_SC_SUCCESS;
439 acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
442 acpi_bus_put_acpi_device(adev);
443 mutex_unlock(&acpi_scan_lock);
444 unlock_device_hotplug();
447 static void acpi_free_power_resources_lists(struct acpi_device *device)
451 if (device->wakeup.flags.valid)
452 acpi_power_resources_list_free(&device->wakeup.resources);
454 if (!device->power.flags.power_resources)
457 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
458 struct acpi_device_power_state *ps = &device->power.states[i];
459 acpi_power_resources_list_free(&ps->resources);
463 static void acpi_device_release(struct device *dev)
465 struct acpi_device *acpi_dev = to_acpi_device(dev);
467 acpi_free_properties(acpi_dev);
468 acpi_free_pnp_ids(&acpi_dev->pnp);
469 acpi_free_power_resources_lists(acpi_dev);
473 static void acpi_device_del(struct acpi_device *device)
475 struct acpi_device_bus_id *acpi_device_bus_id;
477 mutex_lock(&acpi_device_lock);
479 list_del(&device->node);
481 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
482 if (!strcmp(acpi_device_bus_id->bus_id,
483 acpi_device_hid(device))) {
484 ida_simple_remove(&acpi_device_bus_id->instance_ida, device->pnp.instance_no);
485 if (ida_is_empty(&acpi_device_bus_id->instance_ida)) {
486 list_del(&acpi_device_bus_id->node);
487 kfree_const(acpi_device_bus_id->bus_id);
488 kfree(acpi_device_bus_id);
493 list_del(&device->wakeup_list);
494 mutex_unlock(&acpi_device_lock);
496 acpi_power_add_remove_device(device, false);
497 acpi_device_remove_files(device);
499 device->remove(device);
501 device_del(&device->dev);
504 static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
506 static LIST_HEAD(acpi_device_del_list);
507 static DEFINE_MUTEX(acpi_device_del_lock);
509 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
512 struct acpi_device *adev;
514 mutex_lock(&acpi_device_del_lock);
516 if (list_empty(&acpi_device_del_list)) {
517 mutex_unlock(&acpi_device_del_lock);
520 adev = list_first_entry(&acpi_device_del_list,
521 struct acpi_device, del_list);
522 list_del(&adev->del_list);
524 mutex_unlock(&acpi_device_del_lock);
526 blocking_notifier_call_chain(&acpi_reconfig_chain,
527 ACPI_RECONFIG_DEVICE_REMOVE, adev);
529 acpi_device_del(adev);
531 * Drop references to all power resources that might have been
532 * used by the device.
534 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
535 put_device(&adev->dev);
540 * acpi_scan_drop_device - Drop an ACPI device object.
541 * @handle: Handle of an ACPI namespace node, not used.
542 * @context: Address of the ACPI device object to drop.
544 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
545 * namespace node the device object pointed to by @context is attached to.
547 * The unregistration is carried out asynchronously to avoid running
548 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
549 * ensure the correct ordering (the device objects must be unregistered in the
550 * same order in which the corresponding namespace nodes are deleted).
552 static void acpi_scan_drop_device(acpi_handle handle, void *context)
554 static DECLARE_WORK(work, acpi_device_del_work_fn);
555 struct acpi_device *adev = context;
557 mutex_lock(&acpi_device_del_lock);
560 * Use the ACPI hotplug workqueue which is ordered, so this work item
561 * won't run after any hotplug work items submitted subsequently. That
562 * prevents attempts to register device objects identical to those being
563 * deleted from happening concurrently (such attempts result from
564 * hotplug events handled via the ACPI hotplug workqueue). It also will
565 * run after all of the work items submitted previosuly, which helps
566 * those work items to ensure that they are not accessing stale device
569 if (list_empty(&acpi_device_del_list))
570 acpi_queue_hotplug_work(&work);
572 list_add_tail(&adev->del_list, &acpi_device_del_list);
573 /* Make acpi_ns_validate_handle() return NULL for this handle. */
574 adev->handle = INVALID_ACPI_HANDLE;
576 mutex_unlock(&acpi_device_del_lock);
579 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
580 void (*callback)(void *))
589 status = acpi_get_data_full(handle, acpi_scan_drop_device,
590 (void **)device, callback);
591 if (ACPI_FAILURE(status) || !*device) {
592 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
599 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
601 return acpi_get_device_data(handle, device, NULL);
603 EXPORT_SYMBOL(acpi_bus_get_device);
605 static void get_acpi_device(void *dev)
608 get_device(&((struct acpi_device *)dev)->dev);
611 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
613 struct acpi_device *adev = NULL;
615 acpi_get_device_data(handle, &adev, get_acpi_device);
619 void acpi_bus_put_acpi_device(struct acpi_device *adev)
621 put_device(&adev->dev);
624 static struct acpi_device_bus_id *acpi_device_bus_id_match(const char *dev_id)
626 struct acpi_device_bus_id *acpi_device_bus_id;
628 /* Find suitable bus_id and instance number in acpi_bus_id_list. */
629 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
630 if (!strcmp(acpi_device_bus_id->bus_id, dev_id))
631 return acpi_device_bus_id;
636 static int acpi_device_set_name(struct acpi_device *device,
637 struct acpi_device_bus_id *acpi_device_bus_id)
639 struct ida *instance_ida = &acpi_device_bus_id->instance_ida;
642 result = ida_simple_get(instance_ida, 0, ACPI_MAX_DEVICE_INSTANCES, GFP_KERNEL);
646 device->pnp.instance_no = result;
647 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, result);
651 int acpi_device_add(struct acpi_device *device,
652 void (*release)(struct device *))
654 struct acpi_device_bus_id *acpi_device_bus_id;
657 if (device->handle) {
660 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
662 if (ACPI_FAILURE(status)) {
663 acpi_handle_err(device->handle,
664 "Unable to attach device data\n");
672 * Link this device to its parent and siblings.
674 INIT_LIST_HEAD(&device->children);
675 INIT_LIST_HEAD(&device->node);
676 INIT_LIST_HEAD(&device->wakeup_list);
677 INIT_LIST_HEAD(&device->physical_node_list);
678 INIT_LIST_HEAD(&device->del_list);
679 mutex_init(&device->physical_node_lock);
681 mutex_lock(&acpi_device_lock);
683 acpi_device_bus_id = acpi_device_bus_id_match(acpi_device_hid(device));
684 if (acpi_device_bus_id) {
685 result = acpi_device_set_name(device, acpi_device_bus_id);
689 acpi_device_bus_id = kzalloc(sizeof(*acpi_device_bus_id),
691 if (!acpi_device_bus_id) {
695 acpi_device_bus_id->bus_id =
696 kstrdup_const(acpi_device_hid(device), GFP_KERNEL);
697 if (!acpi_device_bus_id->bus_id) {
698 kfree(acpi_device_bus_id);
703 ida_init(&acpi_device_bus_id->instance_ida);
705 result = acpi_device_set_name(device, acpi_device_bus_id);
707 kfree_const(acpi_device_bus_id->bus_id);
708 kfree(acpi_device_bus_id);
712 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
716 list_add_tail(&device->node, &device->parent->children);
718 if (device->wakeup.flags.valid)
719 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
720 mutex_unlock(&acpi_device_lock);
723 device->dev.parent = &device->parent->dev;
724 device->dev.bus = &acpi_bus_type;
725 device->dev.release = release;
726 result = device_add(&device->dev);
728 dev_err(&device->dev, "Error registering device\n");
732 result = acpi_device_setup_files(device);
734 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
735 dev_name(&device->dev));
740 mutex_lock(&acpi_device_lock);
742 list_del(&device->node);
743 list_del(&device->wakeup_list);
746 mutex_unlock(&acpi_device_lock);
748 acpi_detach_data(device->handle, acpi_scan_drop_device);
752 /* --------------------------------------------------------------------------
754 -------------------------------------------------------------------------- */
755 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
757 struct acpi_device *device = NULL;
761 * Fixed hardware devices do not appear in the namespace and do not
762 * have handles, but we fabricate acpi_devices for them, so we have
763 * to deal with them specially.
769 status = acpi_get_parent(handle, &handle);
770 if (ACPI_FAILURE(status))
771 return status == AE_NULL_ENTRY ? NULL : acpi_root;
772 } while (acpi_bus_get_device(handle, &device));
777 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
781 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
782 union acpi_object *obj;
784 status = acpi_get_handle(handle, "_EJD", &tmp);
785 if (ACPI_FAILURE(status))
788 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
789 if (ACPI_SUCCESS(status)) {
790 obj = buffer.pointer;
791 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
793 kfree(buffer.pointer);
797 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
799 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
800 struct acpi_device_wakeup *wakeup)
802 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
803 union acpi_object *package = NULL;
804 union acpi_object *element = NULL;
811 INIT_LIST_HEAD(&wakeup->resources);
814 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
815 if (ACPI_FAILURE(status)) {
816 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
820 package = (union acpi_object *)buffer.pointer;
822 if (!package || package->package.count < 2)
825 element = &(package->package.elements[0]);
829 if (element->type == ACPI_TYPE_PACKAGE) {
830 if ((element->package.count < 2) ||
831 (element->package.elements[0].type !=
832 ACPI_TYPE_LOCAL_REFERENCE)
833 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
837 element->package.elements[0].reference.handle;
839 (u32) element->package.elements[1].integer.value;
840 } else if (element->type == ACPI_TYPE_INTEGER) {
841 wakeup->gpe_device = NULL;
842 wakeup->gpe_number = element->integer.value;
847 element = &(package->package.elements[1]);
848 if (element->type != ACPI_TYPE_INTEGER)
851 wakeup->sleep_state = element->integer.value;
853 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
857 if (!list_empty(&wakeup->resources)) {
860 err = acpi_power_wakeup_list_init(&wakeup->resources,
863 acpi_handle_warn(handle, "Retrieving current states "
864 "of wakeup power resources failed\n");
865 acpi_power_resources_list_free(&wakeup->resources);
868 if (sleep_state < wakeup->sleep_state) {
869 acpi_handle_warn(handle, "Overriding _PRW sleep state "
870 "(S%d) by S%d from power resources\n",
871 (int)wakeup->sleep_state, sleep_state);
872 wakeup->sleep_state = sleep_state;
877 kfree(buffer.pointer);
881 static void acpi_wakeup_gpe_init(struct acpi_device *device)
883 static const struct acpi_device_id button_device_ids[] = {
889 struct acpi_device_wakeup *wakeup = &device->wakeup;
891 acpi_event_status event_status;
893 wakeup->flags.notifier_present = 0;
895 /* Power button, Lid switch always enable wakeup */
896 if (!acpi_match_device_ids(device, button_device_ids)) {
897 wakeup->flags.run_wake = 1;
898 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
899 /* Do not use Lid/sleep button for S5 wakeup */
900 if (wakeup->sleep_state == ACPI_STATE_S5)
901 wakeup->sleep_state = ACPI_STATE_S4;
903 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
904 device_set_wakeup_capable(&device->dev, true);
908 acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
910 status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number,
912 if (ACPI_FAILURE(status))
915 wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HAS_HANDLER);
918 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
922 /* Presence of _PRW indicates wake capable */
923 if (!acpi_has_method(device->handle, "_PRW"))
926 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
929 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
933 device->wakeup.flags.valid = 1;
934 device->wakeup.prepare_count = 0;
935 acpi_wakeup_gpe_init(device);
936 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
937 * system for the ACPI device with the _PRW object.
938 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
939 * So it is necessary to call _DSW object first. Only when it is not
940 * present will the _PSW object used.
942 err = acpi_device_sleep_wake(device, 0, 0, 0);
944 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
945 "error in _DSW or _PSW evaluation\n"));
948 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
950 struct acpi_device_power_state *ps = &device->power.states[state];
951 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
952 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
955 INIT_LIST_HEAD(&ps->resources);
957 /* Evaluate "_PRx" to get referenced power resources */
958 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
959 if (ACPI_SUCCESS(status)) {
960 union acpi_object *package = buffer.pointer;
962 if (buffer.length && package
963 && package->type == ACPI_TYPE_PACKAGE
964 && package->package.count)
965 acpi_extract_power_resources(package, 0, &ps->resources);
967 ACPI_FREE(buffer.pointer);
970 /* Evaluate "_PSx" to see if we can do explicit sets */
972 if (acpi_has_method(device->handle, pathname))
973 ps->flags.explicit_set = 1;
975 /* State is valid if there are means to put the device into it. */
976 if (!list_empty(&ps->resources) || ps->flags.explicit_set)
979 ps->power = -1; /* Unknown - driver assigned */
980 ps->latency = -1; /* Unknown - driver assigned */
983 static void acpi_bus_get_power_flags(struct acpi_device *device)
987 /* Presence of _PS0|_PR0 indicates 'power manageable' */
988 if (!acpi_has_method(device->handle, "_PS0") &&
989 !acpi_has_method(device->handle, "_PR0"))
992 device->flags.power_manageable = 1;
995 * Power Management Flags
997 if (acpi_has_method(device->handle, "_PSC"))
998 device->power.flags.explicit_get = 1;
1000 if (acpi_has_method(device->handle, "_IRC"))
1001 device->power.flags.inrush_current = 1;
1003 if (acpi_has_method(device->handle, "_DSW"))
1004 device->power.flags.dsw_present = 1;
1007 * Enumerate supported power management states
1009 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1010 acpi_bus_init_power_state(device, i);
1012 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1014 /* Set the defaults for D0 and D3hot (always supported). */
1015 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1016 device->power.states[ACPI_STATE_D0].power = 100;
1017 device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
1020 * Use power resources only if the D0 list of them is populated, because
1021 * some platforms may provide _PR3 only to indicate D3cold support and
1022 * in those cases the power resources list returned by it may be bogus.
1024 if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) {
1025 device->power.flags.power_resources = 1;
1027 * D3cold is supported if the D3hot list of power resources is
1030 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
1031 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1034 if (acpi_bus_init_power(device))
1035 device->flags.power_manageable = 0;
1038 static void acpi_bus_get_flags(struct acpi_device *device)
1040 /* Presence of _STA indicates 'dynamic_status' */
1041 if (acpi_has_method(device->handle, "_STA"))
1042 device->flags.dynamic_status = 1;
1044 /* Presence of _RMV indicates 'removable' */
1045 if (acpi_has_method(device->handle, "_RMV"))
1046 device->flags.removable = 1;
1048 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1049 if (acpi_has_method(device->handle, "_EJD") ||
1050 acpi_has_method(device->handle, "_EJ0"))
1051 device->flags.ejectable = 1;
1054 static void acpi_device_get_busid(struct acpi_device *device)
1056 char bus_id[5] = { '?', 0 };
1057 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1063 * The device's Bus ID is simply the object name.
1064 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1066 if (ACPI_IS_ROOT_DEVICE(device)) {
1067 strcpy(device->pnp.bus_id, "ACPI");
1071 switch (device->device_type) {
1072 case ACPI_BUS_TYPE_POWER_BUTTON:
1073 strcpy(device->pnp.bus_id, "PWRF");
1075 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1076 strcpy(device->pnp.bus_id, "SLPF");
1079 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1080 /* Clean up trailing underscores (if any) */
1081 for (i = 3; i > 1; i--) {
1082 if (bus_id[i] == '_')
1087 strcpy(device->pnp.bus_id, bus_id);
1093 * acpi_ata_match - see if an acpi object is an ATA device
1095 * If an acpi object has one of the ACPI ATA methods defined,
1096 * then we can safely call it an ATA device.
1098 bool acpi_ata_match(acpi_handle handle)
1100 return acpi_has_method(handle, "_GTF") ||
1101 acpi_has_method(handle, "_GTM") ||
1102 acpi_has_method(handle, "_STM") ||
1103 acpi_has_method(handle, "_SDD");
1107 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1109 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1110 * then we can safely call it an ejectable drive bay
1112 bool acpi_bay_match(acpi_handle handle)
1114 acpi_handle phandle;
1116 if (!acpi_has_method(handle, "_EJ0"))
1118 if (acpi_ata_match(handle))
1120 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1123 return acpi_ata_match(phandle);
1126 bool acpi_device_is_battery(struct acpi_device *adev)
1128 struct acpi_hardware_id *hwid;
1130 list_for_each_entry(hwid, &adev->pnp.ids, list)
1131 if (!strcmp("PNP0C0A", hwid->id))
1137 static bool is_ejectable_bay(struct acpi_device *adev)
1139 acpi_handle handle = adev->handle;
1141 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1144 return acpi_bay_match(handle);
1148 * acpi_dock_match - see if an acpi object has a _DCK method
1150 bool acpi_dock_match(acpi_handle handle)
1152 return acpi_has_method(handle, "_DCK");
1156 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1157 void **return_value)
1159 long *cap = context;
1161 if (acpi_has_method(handle, "_BCM") &&
1162 acpi_has_method(handle, "_BCL")) {
1163 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
1165 *cap |= ACPI_VIDEO_BACKLIGHT;
1166 if (!acpi_has_method(handle, "_BQC"))
1167 printk(KERN_WARNING FW_BUG PREFIX "No _BQC method, "
1168 "cannot determine initial brightness\n");
1169 /* We have backlight support, no need to scan further */
1170 return AE_CTRL_TERMINATE;
1175 /* Returns true if the ACPI object is a video device which can be
1176 * handled by video.ko.
1177 * The device will get a Linux specific CID added in scan.c to
1178 * identify the device as an ACPI graphics device
1179 * Be aware that the graphics device may not be physically present
1180 * Use acpi_video_get_capabilities() to detect general ACPI video
1181 * capabilities of present cards
1183 long acpi_is_video_device(acpi_handle handle)
1185 long video_caps = 0;
1187 /* Is this device able to support video switching ? */
1188 if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1189 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1191 /* Is this device able to retrieve a video ROM ? */
1192 if (acpi_has_method(handle, "_ROM"))
1193 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1195 /* Is this device able to configure which video head to be POSTed ? */
1196 if (acpi_has_method(handle, "_VPO") &&
1197 acpi_has_method(handle, "_GPD") &&
1198 acpi_has_method(handle, "_SPD"))
1199 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1201 /* Only check for backlight functionality if one of the above hit. */
1203 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1204 ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1209 EXPORT_SYMBOL(acpi_is_video_device);
1211 const char *acpi_device_hid(struct acpi_device *device)
1213 struct acpi_hardware_id *hid;
1215 if (list_empty(&device->pnp.ids))
1218 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1221 EXPORT_SYMBOL(acpi_device_hid);
1223 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1225 struct acpi_hardware_id *id;
1227 id = kmalloc(sizeof(*id), GFP_KERNEL);
1231 id->id = kstrdup_const(dev_id, GFP_KERNEL);
1237 list_add_tail(&id->list, &pnp->ids);
1238 pnp->type.hardware_id = 1;
1242 * Old IBM workstations have a DSDT bug wherein the SMBus object
1243 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1244 * prefix. Work around this.
1246 static bool acpi_ibm_smbus_match(acpi_handle handle)
1248 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1249 struct acpi_buffer path = { sizeof(node_name), node_name };
1251 if (!dmi_name_in_vendors("IBM"))
1254 /* Look for SMBS object */
1255 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1256 strcmp("SMBS", path.pointer))
1259 /* Does it have the necessary (but misnamed) methods? */
1260 if (acpi_has_method(handle, "SBI") &&
1261 acpi_has_method(handle, "SBR") &&
1262 acpi_has_method(handle, "SBW"))
1268 static bool acpi_object_is_system_bus(acpi_handle handle)
1272 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1275 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1282 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1286 struct acpi_device_info *info;
1287 struct acpi_pnp_device_id_list *cid_list;
1290 switch (device_type) {
1291 case ACPI_BUS_TYPE_DEVICE:
1292 if (handle == ACPI_ROOT_OBJECT) {
1293 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1297 status = acpi_get_object_info(handle, &info);
1298 if (ACPI_FAILURE(status)) {
1299 pr_err(PREFIX "%s: Error reading device info\n",
1304 if (info->valid & ACPI_VALID_HID) {
1305 acpi_add_id(pnp, info->hardware_id.string);
1306 pnp->type.platform_id = 1;
1308 if (info->valid & ACPI_VALID_CID) {
1309 cid_list = &info->compatible_id_list;
1310 for (i = 0; i < cid_list->count; i++)
1311 acpi_add_id(pnp, cid_list->ids[i].string);
1313 if (info->valid & ACPI_VALID_ADR) {
1314 pnp->bus_address = info->address;
1315 pnp->type.bus_address = 1;
1317 if (info->valid & ACPI_VALID_UID)
1318 pnp->unique_id = kstrdup(info->unique_id.string,
1320 if (info->valid & ACPI_VALID_CLS)
1321 acpi_add_id(pnp, info->class_code.string);
1326 * Some devices don't reliably have _HIDs & _CIDs, so add
1327 * synthetic HIDs to make sure drivers can find them.
1329 if (acpi_is_video_device(handle))
1330 acpi_add_id(pnp, ACPI_VIDEO_HID);
1331 else if (acpi_bay_match(handle))
1332 acpi_add_id(pnp, ACPI_BAY_HID);
1333 else if (acpi_dock_match(handle))
1334 acpi_add_id(pnp, ACPI_DOCK_HID);
1335 else if (acpi_ibm_smbus_match(handle))
1336 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1337 else if (list_empty(&pnp->ids) &&
1338 acpi_object_is_system_bus(handle)) {
1339 /* \_SB, \_TZ, LNXSYBUS */
1340 acpi_add_id(pnp, ACPI_BUS_HID);
1341 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1342 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1346 case ACPI_BUS_TYPE_POWER:
1347 acpi_add_id(pnp, ACPI_POWER_HID);
1349 case ACPI_BUS_TYPE_PROCESSOR:
1350 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1352 case ACPI_BUS_TYPE_THERMAL:
1353 acpi_add_id(pnp, ACPI_THERMAL_HID);
1355 case ACPI_BUS_TYPE_POWER_BUTTON:
1356 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1358 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1359 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1364 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1366 struct acpi_hardware_id *id, *tmp;
1368 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1369 kfree_const(id->id);
1372 kfree(pnp->unique_id);
1376 * acpi_dma_supported - Check DMA support for the specified device.
1377 * @adev: The pointer to acpi device
1379 * Return false if DMA is not supported. Otherwise, return true
1381 bool acpi_dma_supported(struct acpi_device *adev)
1386 if (adev->flags.cca_seen)
1390 * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1391 * DMA on "Intel platforms". Presumably that includes all x86 and
1392 * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1394 if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1401 * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1402 * @adev: The pointer to acpi device
1404 * Return enum dev_dma_attr.
1406 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1408 if (!acpi_dma_supported(adev))
1409 return DEV_DMA_NOT_SUPPORTED;
1411 if (adev->flags.coherent_dma)
1412 return DEV_DMA_COHERENT;
1414 return DEV_DMA_NON_COHERENT;
1417 static void acpi_init_coherency(struct acpi_device *adev)
1419 unsigned long long cca = 0;
1421 struct acpi_device *parent = adev->parent;
1423 if (parent && parent->flags.cca_seen) {
1425 * From ACPI spec, OSPM will ignore _CCA if an ancestor
1428 adev->flags.cca_seen = 1;
1429 cca = parent->flags.coherent_dma;
1431 status = acpi_evaluate_integer(adev->handle, "_CCA",
1433 if (ACPI_SUCCESS(status))
1434 adev->flags.cca_seen = 1;
1435 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1437 * If architecture does not specify that _CCA is
1438 * required for DMA-able devices (e.g. x86),
1439 * we default to _CCA=1.
1443 acpi_handle_debug(adev->handle,
1444 "ACPI device is missing _CCA.\n");
1447 adev->flags.coherent_dma = cca;
1450 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1451 int type, unsigned long long sta)
1453 INIT_LIST_HEAD(&device->pnp.ids);
1454 device->device_type = type;
1455 device->handle = handle;
1456 device->parent = acpi_bus_get_parent(handle);
1457 device->fwnode.type = FWNODE_ACPI;
1458 acpi_set_device_status(device, sta);
1459 acpi_device_get_busid(device);
1460 acpi_set_pnp_ids(handle, &device->pnp, type);
1461 acpi_init_properties(device);
1462 acpi_bus_get_flags(device);
1463 device->flags.match_driver = false;
1464 device->flags.initialized = true;
1465 acpi_device_clear_enumerated(device);
1466 device_initialize(&device->dev);
1467 dev_set_uevent_suppress(&device->dev, true);
1468 acpi_init_coherency(device);
1469 /* Assume there are unmet deps until acpi_device_dep_initialize() runs */
1470 device->dep_unmet = 1;
1473 void acpi_device_add_finalize(struct acpi_device *device)
1475 dev_set_uevent_suppress(&device->dev, false);
1476 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1479 static int acpi_add_single_object(struct acpi_device **child,
1480 acpi_handle handle, int type,
1481 unsigned long long sta)
1484 struct acpi_device *device;
1485 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1487 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1489 printk(KERN_ERR PREFIX "Memory allocation error\n");
1493 acpi_init_device_object(device, handle, type, sta);
1495 * For ACPI_BUS_TYPE_DEVICE getting the status is delayed till here so
1496 * that we can call acpi_bus_get_status() and use its quirk handling.
1497 * Note this must be done before the get power-/wakeup_dev-flags calls.
1499 if (type == ACPI_BUS_TYPE_DEVICE)
1500 if (acpi_bus_get_status(device) < 0)
1501 acpi_set_device_status(device, 0);
1503 acpi_bus_get_power_flags(device);
1504 acpi_bus_get_wakeup_device_flags(device);
1506 result = acpi_device_add(device, acpi_device_release);
1508 acpi_device_release(&device->dev);
1512 acpi_power_add_remove_device(device, true);
1513 acpi_device_add_finalize(device);
1514 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1515 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1516 dev_name(&device->dev), (char *) buffer.pointer,
1517 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1518 kfree(buffer.pointer);
1523 static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1526 struct resource *res = context;
1528 if (acpi_dev_resource_memory(ares, res))
1529 return AE_CTRL_TERMINATE;
1534 static bool acpi_device_should_be_hidden(acpi_handle handle)
1537 struct resource res;
1539 /* Check if it should ignore the UART device */
1540 if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1544 * The UART device described in SPCR table is assumed to have only one
1545 * memory resource present. So we only look for the first one here.
1547 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1548 acpi_get_resource_memory, &res);
1549 if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1552 acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1558 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1559 unsigned long long *sta)
1562 acpi_object_type acpi_type;
1564 status = acpi_get_type(handle, &acpi_type);
1565 if (ACPI_FAILURE(status))
1568 switch (acpi_type) {
1569 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1570 case ACPI_TYPE_DEVICE:
1571 if (acpi_device_should_be_hidden(handle))
1574 *type = ACPI_BUS_TYPE_DEVICE;
1576 * acpi_add_single_object updates this once we've an acpi_device
1577 * so that acpi_bus_get_status' quirk handling can be used.
1579 *sta = ACPI_STA_DEFAULT;
1581 case ACPI_TYPE_PROCESSOR:
1582 *type = ACPI_BUS_TYPE_PROCESSOR;
1583 status = acpi_bus_get_status_handle(handle, sta);
1584 if (ACPI_FAILURE(status))
1587 case ACPI_TYPE_THERMAL:
1588 *type = ACPI_BUS_TYPE_THERMAL;
1589 *sta = ACPI_STA_DEFAULT;
1591 case ACPI_TYPE_POWER:
1592 *type = ACPI_BUS_TYPE_POWER;
1593 *sta = ACPI_STA_DEFAULT;
1602 bool acpi_device_is_present(struct acpi_device *adev)
1604 if (adev->status.present || adev->status.functional)
1607 adev->flags.initialized = false;
1611 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1613 const struct acpi_device_id **matchid)
1615 const struct acpi_device_id *devid;
1618 return handler->match(idstr, matchid);
1620 for (devid = handler->ids; devid->id[0]; devid++)
1621 if (!strcmp((char *)devid->id, idstr)) {
1631 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1632 const struct acpi_device_id **matchid)
1634 struct acpi_scan_handler *handler;
1636 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1637 if (acpi_scan_handler_matching(handler, idstr, matchid))
1643 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1645 if (!!hotplug->enabled == !!val)
1648 mutex_lock(&acpi_scan_lock);
1650 hotplug->enabled = val;
1652 mutex_unlock(&acpi_scan_lock);
1655 static void acpi_scan_init_hotplug(struct acpi_device *adev)
1657 struct acpi_hardware_id *hwid;
1659 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1660 acpi_dock_add(adev);
1663 list_for_each_entry(hwid, &adev->pnp.ids, list) {
1664 struct acpi_scan_handler *handler;
1666 handler = acpi_scan_match_handler(hwid->id, NULL);
1668 adev->flags.hotplug_notify = true;
1674 static void acpi_device_dep_initialize(struct acpi_device *adev)
1676 struct acpi_dep_data *dep;
1677 struct acpi_handle_list dep_devices;
1681 adev->dep_unmet = 0;
1683 if (!acpi_has_method(adev->handle, "_DEP"))
1686 status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
1688 if (ACPI_FAILURE(status)) {
1689 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
1693 for (i = 0; i < dep_devices.count; i++) {
1694 struct acpi_device_info *info;
1697 status = acpi_get_object_info(dep_devices.handles[i], &info);
1698 if (ACPI_FAILURE(status)) {
1699 dev_dbg(&adev->dev, "Error reading _DEP device info\n");
1704 * Skip the dependency of Windows System Power
1705 * Management Controller
1707 skip = info->valid & ACPI_VALID_HID &&
1708 !strcmp(info->hardware_id.string, "INT3396");
1715 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
1719 dep->master = dep_devices.handles[i];
1720 dep->slave = adev->handle;
1723 mutex_lock(&acpi_dep_list_lock);
1724 list_add_tail(&dep->node , &acpi_dep_list);
1725 mutex_unlock(&acpi_dep_list_lock);
1729 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1730 void *not_used, void **return_value)
1732 struct acpi_device *device = NULL;
1734 unsigned long long sta;
1737 acpi_bus_get_device(handle, &device);
1741 result = acpi_bus_type_and_status(handle, &type, &sta);
1745 if (type == ACPI_BUS_TYPE_POWER) {
1746 acpi_add_power_resource(handle);
1750 acpi_add_single_object(&device, handle, type, sta);
1752 return AE_CTRL_DEPTH;
1754 acpi_scan_init_hotplug(device);
1755 acpi_device_dep_initialize(device);
1759 *return_value = device;
1764 static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
1766 bool *is_spi_i2c_slave_p = data;
1768 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1772 * devices that are connected to UART still need to be enumerated to
1775 if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
1776 *is_spi_i2c_slave_p = true;
1778 /* no need to do more checking */
1782 static void acpi_default_enumeration(struct acpi_device *device)
1784 struct list_head resource_list;
1785 bool is_spi_i2c_slave = false;
1788 * Do not enumerate SPI/I2C slaves as they will be enumerated by their
1789 * respective parents.
1791 INIT_LIST_HEAD(&resource_list);
1792 acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
1794 acpi_dev_free_resource_list(&resource_list);
1795 if (!is_spi_i2c_slave) {
1796 acpi_create_platform_device(device, NULL);
1797 acpi_device_set_enumerated(device);
1799 blocking_notifier_call_chain(&acpi_reconfig_chain,
1800 ACPI_RECONFIG_DEVICE_ADD, device);
1804 static const struct acpi_device_id generic_device_ids[] = {
1805 {ACPI_DT_NAMESPACE_HID, },
1809 static int acpi_generic_device_attach(struct acpi_device *adev,
1810 const struct acpi_device_id *not_used)
1813 * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
1814 * below can be unconditional.
1816 if (adev->data.of_compatible)
1817 acpi_default_enumeration(adev);
1822 static struct acpi_scan_handler generic_device_handler = {
1823 .ids = generic_device_ids,
1824 .attach = acpi_generic_device_attach,
1827 static int acpi_scan_attach_handler(struct acpi_device *device)
1829 struct acpi_hardware_id *hwid;
1832 list_for_each_entry(hwid, &device->pnp.ids, list) {
1833 const struct acpi_device_id *devid;
1834 struct acpi_scan_handler *handler;
1836 handler = acpi_scan_match_handler(hwid->id, &devid);
1838 if (!handler->attach) {
1839 device->pnp.type.platform_id = 0;
1842 device->handler = handler;
1843 ret = handler->attach(device, devid);
1847 device->handler = NULL;
1856 static void acpi_bus_attach(struct acpi_device *device)
1858 struct acpi_device *child;
1862 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
1863 register_dock_dependent_device(device, ejd);
1865 acpi_bus_get_status(device);
1866 /* Skip devices that are not present. */
1867 if (!acpi_device_is_present(device)) {
1868 acpi_device_clear_enumerated(device);
1869 device->flags.power_manageable = 0;
1872 if (device->handler)
1875 if (!device->flags.initialized) {
1876 device->flags.power_manageable =
1877 device->power.states[ACPI_STATE_D0].flags.valid;
1878 if (acpi_bus_init_power(device))
1879 device->flags.power_manageable = 0;
1881 device->flags.initialized = true;
1884 ret = acpi_scan_attach_handler(device);
1888 device->flags.match_driver = true;
1890 acpi_device_set_enumerated(device);
1894 ret = device_attach(&device->dev);
1898 if (ret > 0 || !device->pnp.type.platform_id)
1899 acpi_device_set_enumerated(device);
1901 acpi_default_enumeration(device);
1904 list_for_each_entry(child, &device->children, node)
1905 acpi_bus_attach(child);
1907 if (device->handler && device->handler->hotplug.notify_online)
1908 device->handler->hotplug.notify_online(device);
1911 void acpi_walk_dep_device_list(acpi_handle handle)
1913 struct acpi_dep_data *dep, *tmp;
1914 struct acpi_device *adev;
1916 mutex_lock(&acpi_dep_list_lock);
1917 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
1918 if (dep->master == handle) {
1919 acpi_bus_get_device(dep->slave, &adev);
1924 if (!adev->dep_unmet)
1925 acpi_bus_attach(adev);
1926 list_del(&dep->node);
1930 mutex_unlock(&acpi_dep_list_lock);
1932 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
1935 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1936 * @handle: Root of the namespace scope to scan.
1938 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1941 * If no devices were found, -ENODEV is returned, but it does not mean that
1942 * there has been a real error. There just have been no suitable ACPI objects
1943 * in the table trunk from which the kernel could create a device and add an
1944 * appropriate driver.
1946 * Must be called under acpi_scan_lock.
1948 int acpi_bus_scan(acpi_handle handle)
1950 void *device = NULL;
1952 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1953 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1954 acpi_bus_check_add, NULL, NULL, &device);
1957 acpi_bus_attach(device);
1962 EXPORT_SYMBOL(acpi_bus_scan);
1965 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
1966 * @adev: Root of the ACPI namespace scope to walk.
1968 * Must be called under acpi_scan_lock.
1970 void acpi_bus_trim(struct acpi_device *adev)
1972 struct acpi_scan_handler *handler = adev->handler;
1973 struct acpi_device *child;
1975 list_for_each_entry_reverse(child, &adev->children, node)
1976 acpi_bus_trim(child);
1978 adev->flags.match_driver = false;
1980 if (handler->detach)
1981 handler->detach(adev);
1983 adev->handler = NULL;
1985 device_release_driver(&adev->dev);
1988 * Most likely, the device is going away, so put it into D3cold before
1991 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
1992 adev->flags.initialized = false;
1993 acpi_device_clear_enumerated(adev);
1995 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1997 static int acpi_bus_scan_fixed(void)
2002 * Enumerate all fixed-feature devices.
2004 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2005 struct acpi_device *device = NULL;
2007 result = acpi_add_single_object(&device, NULL,
2008 ACPI_BUS_TYPE_POWER_BUTTON,
2013 device->flags.match_driver = true;
2014 result = device_attach(&device->dev);
2018 device_init_wakeup(&device->dev, true);
2021 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2022 struct acpi_device *device = NULL;
2024 result = acpi_add_single_object(&device, NULL,
2025 ACPI_BUS_TYPE_SLEEP_BUTTON,
2030 device->flags.match_driver = true;
2031 result = device_attach(&device->dev);
2034 return result < 0 ? result : 0;
2037 static void __init acpi_get_spcr_uart_addr(void)
2040 struct acpi_table_spcr *spcr_ptr;
2042 status = acpi_get_table(ACPI_SIG_SPCR, 0,
2043 (struct acpi_table_header **)&spcr_ptr);
2044 if (ACPI_SUCCESS(status))
2045 spcr_uart_addr = spcr_ptr->serial_port.address;
2047 printk(KERN_WARNING PREFIX "STAO table present, but SPCR is missing\n");
2050 static bool acpi_scan_initialized;
2052 int __init acpi_scan_init(void)
2056 struct acpi_table_stao *stao_ptr;
2058 acpi_pci_root_init();
2059 acpi_pci_link_init();
2060 acpi_processor_init();
2063 acpi_cmos_rtc_init();
2064 acpi_container_init();
2065 acpi_memory_hotplug_init();
2067 acpi_int340x_thermal_init();
2069 acpi_watchdog_init();
2071 acpi_scan_add_handler(&generic_device_handler);
2074 * If there is STAO table, check whether it needs to ignore the UART
2075 * device in SPCR table.
2077 status = acpi_get_table(ACPI_SIG_STAO, 0,
2078 (struct acpi_table_header **)&stao_ptr);
2079 if (ACPI_SUCCESS(status)) {
2080 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2081 printk(KERN_INFO PREFIX "STAO Name List not yet supported.");
2083 if (stao_ptr->ignore_uart)
2084 acpi_get_spcr_uart_addr();
2087 mutex_lock(&acpi_scan_lock);
2089 * Enumerate devices in the ACPI namespace.
2091 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2095 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2099 /* Fixed feature devices do not exist on HW-reduced platform */
2100 if (!acpi_gbl_reduced_hardware) {
2101 result = acpi_bus_scan_fixed();
2103 acpi_detach_data(acpi_root->handle,
2104 acpi_scan_drop_device);
2105 acpi_device_del(acpi_root);
2106 put_device(&acpi_root->dev);
2111 acpi_gpe_apply_masked_gpes();
2112 acpi_update_all_gpes();
2114 acpi_scan_initialized = true;
2117 mutex_unlock(&acpi_scan_lock);
2121 static struct acpi_probe_entry *ape;
2122 static int acpi_probe_count;
2123 static DEFINE_MUTEX(acpi_probe_mutex);
2125 static int __init acpi_match_madt(struct acpi_subtable_header *header,
2126 const unsigned long end)
2128 if (!ape->subtable_valid || ape->subtable_valid(header, ape))
2129 if (!ape->probe_subtbl(header, end))
2135 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2142 mutex_lock(&acpi_probe_mutex);
2143 for (ape = ap_head; nr; ape++, nr--) {
2144 if (ACPI_COMPARE_NAME(ACPI_SIG_MADT, ape->id)) {
2145 acpi_probe_count = 0;
2146 acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2147 count += acpi_probe_count;
2150 res = acpi_table_parse(ape->id, ape->probe_table);
2155 mutex_unlock(&acpi_probe_mutex);
2160 struct acpi_table_events_work {
2161 struct work_struct work;
2166 static void acpi_table_events_fn(struct work_struct *work)
2168 struct acpi_table_events_work *tew;
2170 tew = container_of(work, struct acpi_table_events_work, work);
2172 if (tew->event == ACPI_TABLE_EVENT_LOAD) {
2173 acpi_scan_lock_acquire();
2174 acpi_bus_scan(ACPI_ROOT_OBJECT);
2175 acpi_scan_lock_release();
2181 void acpi_scan_table_handler(u32 event, void *table, void *context)
2183 struct acpi_table_events_work *tew;
2185 if (!acpi_scan_initialized)
2188 if (event != ACPI_TABLE_EVENT_LOAD)
2191 tew = kmalloc(sizeof(*tew), GFP_KERNEL);
2195 INIT_WORK(&tew->work, acpi_table_events_fn);
2199 schedule_work(&tew->work);
2202 int acpi_reconfig_notifier_register(struct notifier_block *nb)
2204 return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2206 EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2208 int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2210 return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2212 EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);