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);
49 struct acpi_dep_data {
50 struct list_head node;
55 void acpi_scan_lock_acquire(void)
57 mutex_lock(&acpi_scan_lock);
59 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
61 void acpi_scan_lock_release(void)
63 mutex_unlock(&acpi_scan_lock);
65 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
67 void acpi_lock_hp_context(void)
69 mutex_lock(&acpi_hp_context_lock);
72 void acpi_unlock_hp_context(void)
74 mutex_unlock(&acpi_hp_context_lock);
77 void acpi_initialize_hp_context(struct acpi_device *adev,
78 struct acpi_hotplug_context *hp,
79 int (*notify)(struct acpi_device *, u32),
80 void (*uevent)(struct acpi_device *, u32))
82 acpi_lock_hp_context();
85 acpi_set_hp_context(adev, hp);
86 acpi_unlock_hp_context();
88 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
90 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
95 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
99 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
100 const char *hotplug_profile_name)
104 error = acpi_scan_add_handler(handler);
108 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
112 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
114 struct acpi_device_physical_node *pn;
118 * acpi_container_offline() calls this for all of the container's
119 * children under the container's physical_node_lock lock.
121 mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
123 list_for_each_entry(pn, &adev->physical_node_list, node)
124 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
126 kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
132 mutex_unlock(&adev->physical_node_lock);
136 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
139 struct acpi_device *device = NULL;
140 struct acpi_device_physical_node *pn;
141 bool second_pass = (bool)data;
142 acpi_status status = AE_OK;
144 if (acpi_bus_get_device(handle, &device))
147 if (device->handler && !device->handler->hotplug.enabled) {
148 *ret_p = &device->dev;
152 mutex_lock(&device->physical_node_lock);
154 list_for_each_entry(pn, &device->physical_node_list, node) {
158 /* Skip devices offlined by the first pass. */
162 pn->put_online = false;
164 ret = device_offline(pn->dev);
165 if (acpi_force_hot_remove)
169 pn->put_online = !ret;
179 mutex_unlock(&device->physical_node_lock);
184 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
187 struct acpi_device *device = NULL;
188 struct acpi_device_physical_node *pn;
190 if (acpi_bus_get_device(handle, &device))
193 mutex_lock(&device->physical_node_lock);
195 list_for_each_entry(pn, &device->physical_node_list, node)
196 if (pn->put_online) {
197 device_online(pn->dev);
198 pn->put_online = false;
201 mutex_unlock(&device->physical_node_lock);
206 static int acpi_scan_try_to_offline(struct acpi_device *device)
208 acpi_handle handle = device->handle;
209 struct device *errdev = NULL;
213 * Carry out two passes here and ignore errors in the first pass,
214 * because if the devices in question are memory blocks and
215 * CONFIG_MEMCG is set, one of the blocks may hold data structures
216 * that the other blocks depend on, but it is not known in advance which
219 * If the first pass is successful, the second one isn't needed, though.
221 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
222 NULL, acpi_bus_offline, (void *)false,
224 if (status == AE_SUPPORT) {
225 dev_warn(errdev, "Offline disabled.\n");
226 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
227 acpi_bus_online, NULL, NULL, NULL);
230 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
233 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
234 NULL, acpi_bus_offline, (void *)true,
236 if (!errdev || acpi_force_hot_remove)
237 acpi_bus_offline(handle, 0, (void *)true,
240 if (errdev && !acpi_force_hot_remove) {
241 dev_warn(errdev, "Offline failed.\n");
242 acpi_bus_online(handle, 0, NULL, NULL);
243 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
244 ACPI_UINT32_MAX, acpi_bus_online,
252 static int acpi_scan_hot_remove(struct acpi_device *device)
254 acpi_handle handle = device->handle;
255 unsigned long long sta;
258 if (device->handler && device->handler->hotplug.demand_offline
259 && !acpi_force_hot_remove) {
260 if (!acpi_scan_is_offline(device, true))
263 int error = acpi_scan_try_to_offline(device);
268 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
269 "Hot-removing device %s...\n", dev_name(&device->dev)));
271 acpi_bus_trim(device);
273 acpi_evaluate_lck(handle, 0);
277 status = acpi_evaluate_ej0(handle);
278 if (status == AE_NOT_FOUND)
280 else if (ACPI_FAILURE(status))
284 * Verify if eject was indeed successful. If not, log an error
285 * message. No need to call _OST since _EJ0 call was made OK.
287 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
288 if (ACPI_FAILURE(status)) {
289 acpi_handle_warn(handle,
290 "Status check after eject failed (0x%x)\n", status);
291 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
292 acpi_handle_warn(handle,
293 "Eject incomplete - status 0x%llx\n", sta);
299 static int acpi_scan_device_not_present(struct acpi_device *adev)
301 if (!acpi_device_enumerated(adev)) {
302 dev_warn(&adev->dev, "Still not present\n");
309 static int acpi_scan_device_check(struct acpi_device *adev)
313 acpi_bus_get_status(adev);
314 if (adev->status.present || adev->status.functional) {
316 * This function is only called for device objects for which
317 * matching scan handlers exist. The only situation in which
318 * the scan handler is not attached to this device object yet
319 * is when the device has just appeared (either it wasn't
320 * present at all before or it was removed and then added
324 dev_warn(&adev->dev, "Already enumerated\n");
327 error = acpi_bus_scan(adev->handle);
329 dev_warn(&adev->dev, "Namespace scan failure\n");
332 if (!adev->handler) {
333 dev_warn(&adev->dev, "Enumeration failure\n");
337 error = acpi_scan_device_not_present(adev);
342 static int acpi_scan_bus_check(struct acpi_device *adev)
344 struct acpi_scan_handler *handler = adev->handler;
345 struct acpi_device *child;
348 acpi_bus_get_status(adev);
349 if (!(adev->status.present || adev->status.functional)) {
350 acpi_scan_device_not_present(adev);
353 if (handler && handler->hotplug.scan_dependent)
354 return handler->hotplug.scan_dependent(adev);
356 error = acpi_bus_scan(adev->handle);
358 dev_warn(&adev->dev, "Namespace scan failure\n");
361 list_for_each_entry(child, &adev->children, node) {
362 error = acpi_scan_bus_check(child);
369 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
372 case ACPI_NOTIFY_BUS_CHECK:
373 return acpi_scan_bus_check(adev);
374 case ACPI_NOTIFY_DEVICE_CHECK:
375 return acpi_scan_device_check(adev);
376 case ACPI_NOTIFY_EJECT_REQUEST:
377 case ACPI_OST_EC_OSPM_EJECT:
378 if (adev->handler && !adev->handler->hotplug.enabled) {
379 dev_info(&adev->dev, "Eject disabled\n");
382 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
383 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
384 return acpi_scan_hot_remove(adev);
389 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
391 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
394 lock_device_hotplug();
395 mutex_lock(&acpi_scan_lock);
398 * The device object's ACPI handle cannot become invalid as long as we
399 * are holding acpi_scan_lock, but it might have become invalid before
400 * that lock was acquired.
402 if (adev->handle == INVALID_ACPI_HANDLE)
405 if (adev->flags.is_dock_station) {
406 error = dock_notify(adev, src);
407 } else if (adev->flags.hotplug_notify) {
408 error = acpi_generic_hotplug_event(adev, src);
409 if (error == -EPERM) {
410 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
414 int (*notify)(struct acpi_device *, u32);
416 acpi_lock_hp_context();
417 notify = adev->hp ? adev->hp->notify : NULL;
418 acpi_unlock_hp_context();
420 * There may be additional notify handlers for device objects
421 * without the .event() callback, so ignore them here.
424 error = notify(adev, src);
429 ost_code = ACPI_OST_SC_SUCCESS;
432 acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
435 acpi_bus_put_acpi_device(adev);
436 mutex_unlock(&acpi_scan_lock);
437 unlock_device_hotplug();
440 static void acpi_free_power_resources_lists(struct acpi_device *device)
444 if (device->wakeup.flags.valid)
445 acpi_power_resources_list_free(&device->wakeup.resources);
447 if (!device->power.flags.power_resources)
450 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
451 struct acpi_device_power_state *ps = &device->power.states[i];
452 acpi_power_resources_list_free(&ps->resources);
456 static void acpi_device_release(struct device *dev)
458 struct acpi_device *acpi_dev = to_acpi_device(dev);
460 acpi_free_properties(acpi_dev);
461 acpi_free_pnp_ids(&acpi_dev->pnp);
462 acpi_free_power_resources_lists(acpi_dev);
466 static void acpi_device_del(struct acpi_device *device)
468 struct acpi_device_bus_id *acpi_device_bus_id;
470 mutex_lock(&acpi_device_lock);
472 list_del(&device->node);
474 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
475 if (!strcmp(acpi_device_bus_id->bus_id,
476 acpi_device_hid(device))) {
477 if (acpi_device_bus_id->instance_no > 0)
478 acpi_device_bus_id->instance_no--;
480 list_del(&acpi_device_bus_id->node);
481 kfree(acpi_device_bus_id);
486 list_del(&device->wakeup_list);
487 mutex_unlock(&acpi_device_lock);
489 acpi_power_add_remove_device(device, false);
490 acpi_device_remove_files(device);
492 device->remove(device);
494 device_del(&device->dev);
497 static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
499 static LIST_HEAD(acpi_device_del_list);
500 static DEFINE_MUTEX(acpi_device_del_lock);
502 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
505 struct acpi_device *adev;
507 mutex_lock(&acpi_device_del_lock);
509 if (list_empty(&acpi_device_del_list)) {
510 mutex_unlock(&acpi_device_del_lock);
513 adev = list_first_entry(&acpi_device_del_list,
514 struct acpi_device, del_list);
515 list_del(&adev->del_list);
517 mutex_unlock(&acpi_device_del_lock);
519 blocking_notifier_call_chain(&acpi_reconfig_chain,
520 ACPI_RECONFIG_DEVICE_REMOVE, adev);
522 acpi_device_del(adev);
524 * Drop references to all power resources that might have been
525 * used by the device.
527 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
528 put_device(&adev->dev);
533 * acpi_scan_drop_device - Drop an ACPI device object.
534 * @handle: Handle of an ACPI namespace node, not used.
535 * @context: Address of the ACPI device object to drop.
537 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
538 * namespace node the device object pointed to by @context is attached to.
540 * The unregistration is carried out asynchronously to avoid running
541 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
542 * ensure the correct ordering (the device objects must be unregistered in the
543 * same order in which the corresponding namespace nodes are deleted).
545 static void acpi_scan_drop_device(acpi_handle handle, void *context)
547 static DECLARE_WORK(work, acpi_device_del_work_fn);
548 struct acpi_device *adev = context;
550 mutex_lock(&acpi_device_del_lock);
553 * Use the ACPI hotplug workqueue which is ordered, so this work item
554 * won't run after any hotplug work items submitted subsequently. That
555 * prevents attempts to register device objects identical to those being
556 * deleted from happening concurrently (such attempts result from
557 * hotplug events handled via the ACPI hotplug workqueue). It also will
558 * run after all of the work items submitted previosuly, which helps
559 * those work items to ensure that they are not accessing stale device
562 if (list_empty(&acpi_device_del_list))
563 acpi_queue_hotplug_work(&work);
565 list_add_tail(&adev->del_list, &acpi_device_del_list);
566 /* Make acpi_ns_validate_handle() return NULL for this handle. */
567 adev->handle = INVALID_ACPI_HANDLE;
569 mutex_unlock(&acpi_device_del_lock);
572 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
573 void (*callback)(void *))
580 status = acpi_get_data_full(handle, acpi_scan_drop_device,
581 (void **)device, callback);
582 if (ACPI_FAILURE(status) || !*device) {
583 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
590 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
592 return acpi_get_device_data(handle, device, NULL);
594 EXPORT_SYMBOL(acpi_bus_get_device);
596 static void get_acpi_device(void *dev)
599 get_device(&((struct acpi_device *)dev)->dev);
602 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
604 struct acpi_device *adev = NULL;
606 acpi_get_device_data(handle, &adev, get_acpi_device);
610 void acpi_bus_put_acpi_device(struct acpi_device *adev)
612 put_device(&adev->dev);
615 int acpi_device_add(struct acpi_device *device,
616 void (*release)(struct device *))
619 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
622 if (device->handle) {
625 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
627 if (ACPI_FAILURE(status)) {
628 acpi_handle_err(device->handle,
629 "Unable to attach device data\n");
637 * Link this device to its parent and siblings.
639 INIT_LIST_HEAD(&device->children);
640 INIT_LIST_HEAD(&device->node);
641 INIT_LIST_HEAD(&device->wakeup_list);
642 INIT_LIST_HEAD(&device->physical_node_list);
643 INIT_LIST_HEAD(&device->del_list);
644 mutex_init(&device->physical_node_lock);
646 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
648 pr_err(PREFIX "Memory allocation error\n");
653 mutex_lock(&acpi_device_lock);
655 * Find suitable bus_id and instance number in acpi_bus_id_list
656 * If failed, create one and link it into acpi_bus_id_list
658 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
659 if (!strcmp(acpi_device_bus_id->bus_id,
660 acpi_device_hid(device))) {
661 acpi_device_bus_id->instance_no++;
668 acpi_device_bus_id = new_bus_id;
669 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
670 acpi_device_bus_id->instance_no = 0;
671 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
673 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
676 list_add_tail(&device->node, &device->parent->children);
678 if (device->wakeup.flags.valid)
679 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
680 mutex_unlock(&acpi_device_lock);
683 device->dev.parent = &device->parent->dev;
684 device->dev.bus = &acpi_bus_type;
685 device->dev.release = release;
686 result = device_add(&device->dev);
688 dev_err(&device->dev, "Error registering device\n");
692 result = acpi_device_setup_files(device);
694 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
695 dev_name(&device->dev));
700 mutex_lock(&acpi_device_lock);
702 list_del(&device->node);
703 list_del(&device->wakeup_list);
704 mutex_unlock(&acpi_device_lock);
707 acpi_detach_data(device->handle, acpi_scan_drop_device);
711 /* --------------------------------------------------------------------------
713 -------------------------------------------------------------------------- */
714 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
716 struct acpi_device *device = NULL;
720 * Fixed hardware devices do not appear in the namespace and do not
721 * have handles, but we fabricate acpi_devices for them, so we have
722 * to deal with them specially.
728 status = acpi_get_parent(handle, &handle);
729 if (ACPI_FAILURE(status))
730 return status == AE_NULL_ENTRY ? NULL : acpi_root;
731 } while (acpi_bus_get_device(handle, &device));
736 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
740 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
741 union acpi_object *obj;
743 status = acpi_get_handle(handle, "_EJD", &tmp);
744 if (ACPI_FAILURE(status))
747 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
748 if (ACPI_SUCCESS(status)) {
749 obj = buffer.pointer;
750 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
752 kfree(buffer.pointer);
756 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
758 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
759 struct acpi_device_wakeup *wakeup)
761 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
762 union acpi_object *package = NULL;
763 union acpi_object *element = NULL;
770 INIT_LIST_HEAD(&wakeup->resources);
773 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
774 if (ACPI_FAILURE(status)) {
775 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
779 package = (union acpi_object *)buffer.pointer;
781 if (!package || package->package.count < 2)
784 element = &(package->package.elements[0]);
788 if (element->type == ACPI_TYPE_PACKAGE) {
789 if ((element->package.count < 2) ||
790 (element->package.elements[0].type !=
791 ACPI_TYPE_LOCAL_REFERENCE)
792 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
796 element->package.elements[0].reference.handle;
798 (u32) element->package.elements[1].integer.value;
799 } else if (element->type == ACPI_TYPE_INTEGER) {
800 wakeup->gpe_device = NULL;
801 wakeup->gpe_number = element->integer.value;
806 element = &(package->package.elements[1]);
807 if (element->type != ACPI_TYPE_INTEGER)
810 wakeup->sleep_state = element->integer.value;
812 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
816 if (!list_empty(&wakeup->resources)) {
819 err = acpi_power_wakeup_list_init(&wakeup->resources,
822 acpi_handle_warn(handle, "Retrieving current states "
823 "of wakeup power resources failed\n");
824 acpi_power_resources_list_free(&wakeup->resources);
827 if (sleep_state < wakeup->sleep_state) {
828 acpi_handle_warn(handle, "Overriding _PRW sleep state "
829 "(S%d) by S%d from power resources\n",
830 (int)wakeup->sleep_state, sleep_state);
831 wakeup->sleep_state = sleep_state;
836 kfree(buffer.pointer);
840 static void acpi_wakeup_gpe_init(struct acpi_device *device)
842 static const struct acpi_device_id button_device_ids[] = {
848 struct acpi_device_wakeup *wakeup = &device->wakeup;
850 acpi_event_status event_status;
852 wakeup->flags.notifier_present = 0;
854 /* Power button, Lid switch always enable wakeup */
855 if (!acpi_match_device_ids(device, button_device_ids)) {
856 wakeup->flags.run_wake = 1;
857 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
858 /* Do not use Lid/sleep button for S5 wakeup */
859 if (wakeup->sleep_state == ACPI_STATE_S5)
860 wakeup->sleep_state = ACPI_STATE_S4;
862 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
863 device_set_wakeup_capable(&device->dev, true);
867 acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
869 status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number,
871 if (ACPI_FAILURE(status))
874 wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HAS_HANDLER);
877 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
881 /* Presence of _PRW indicates wake capable */
882 if (!acpi_has_method(device->handle, "_PRW"))
885 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
888 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
892 device->wakeup.flags.valid = 1;
893 device->wakeup.prepare_count = 0;
894 acpi_wakeup_gpe_init(device);
895 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
896 * system for the ACPI device with the _PRW object.
897 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
898 * So it is necessary to call _DSW object first. Only when it is not
899 * present will the _PSW object used.
901 err = acpi_device_sleep_wake(device, 0, 0, 0);
903 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
904 "error in _DSW or _PSW evaluation\n"));
907 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
909 struct acpi_device_power_state *ps = &device->power.states[state];
910 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
911 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
914 INIT_LIST_HEAD(&ps->resources);
916 /* Evaluate "_PRx" to get referenced power resources */
917 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
918 if (ACPI_SUCCESS(status)) {
919 union acpi_object *package = buffer.pointer;
921 if (buffer.length && package
922 && package->type == ACPI_TYPE_PACKAGE
923 && package->package.count) {
924 int err = acpi_extract_power_resources(package, 0,
927 device->power.flags.power_resources = 1;
929 ACPI_FREE(buffer.pointer);
932 /* Evaluate "_PSx" to see if we can do explicit sets */
934 if (acpi_has_method(device->handle, pathname))
935 ps->flags.explicit_set = 1;
937 /* State is valid if there are means to put the device into it. */
938 if (!list_empty(&ps->resources) || ps->flags.explicit_set)
941 ps->power = -1; /* Unknown - driver assigned */
942 ps->latency = -1; /* Unknown - driver assigned */
945 static void acpi_bus_get_power_flags(struct acpi_device *device)
949 /* Presence of _PS0|_PR0 indicates 'power manageable' */
950 if (!acpi_has_method(device->handle, "_PS0") &&
951 !acpi_has_method(device->handle, "_PR0"))
954 device->flags.power_manageable = 1;
957 * Power Management Flags
959 if (acpi_has_method(device->handle, "_PSC"))
960 device->power.flags.explicit_get = 1;
962 if (acpi_has_method(device->handle, "_IRC"))
963 device->power.flags.inrush_current = 1;
965 if (acpi_has_method(device->handle, "_DSW"))
966 device->power.flags.dsw_present = 1;
969 * Enumerate supported power management states
971 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
972 acpi_bus_init_power_state(device, i);
974 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
975 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
976 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
978 /* Set defaults for D0 and D3hot states (always valid) */
979 device->power.states[ACPI_STATE_D0].flags.valid = 1;
980 device->power.states[ACPI_STATE_D0].power = 100;
981 device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
983 if (acpi_bus_init_power(device))
984 device->flags.power_manageable = 0;
987 static void acpi_bus_get_flags(struct acpi_device *device)
989 /* Presence of _STA indicates 'dynamic_status' */
990 if (acpi_has_method(device->handle, "_STA"))
991 device->flags.dynamic_status = 1;
993 /* Presence of _RMV indicates 'removable' */
994 if (acpi_has_method(device->handle, "_RMV"))
995 device->flags.removable = 1;
997 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
998 if (acpi_has_method(device->handle, "_EJD") ||
999 acpi_has_method(device->handle, "_EJ0"))
1000 device->flags.ejectable = 1;
1003 static void acpi_device_get_busid(struct acpi_device *device)
1005 char bus_id[5] = { '?', 0 };
1006 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1012 * The device's Bus ID is simply the object name.
1013 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1015 if (ACPI_IS_ROOT_DEVICE(device)) {
1016 strcpy(device->pnp.bus_id, "ACPI");
1020 switch (device->device_type) {
1021 case ACPI_BUS_TYPE_POWER_BUTTON:
1022 strcpy(device->pnp.bus_id, "PWRF");
1024 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1025 strcpy(device->pnp.bus_id, "SLPF");
1028 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1029 /* Clean up trailing underscores (if any) */
1030 for (i = 3; i > 1; i--) {
1031 if (bus_id[i] == '_')
1036 strcpy(device->pnp.bus_id, bus_id);
1042 * acpi_ata_match - see if an acpi object is an ATA device
1044 * If an acpi object has one of the ACPI ATA methods defined,
1045 * then we can safely call it an ATA device.
1047 bool acpi_ata_match(acpi_handle handle)
1049 return acpi_has_method(handle, "_GTF") ||
1050 acpi_has_method(handle, "_GTM") ||
1051 acpi_has_method(handle, "_STM") ||
1052 acpi_has_method(handle, "_SDD");
1056 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1058 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1059 * then we can safely call it an ejectable drive bay
1061 bool acpi_bay_match(acpi_handle handle)
1063 acpi_handle phandle;
1065 if (!acpi_has_method(handle, "_EJ0"))
1067 if (acpi_ata_match(handle))
1069 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1072 return acpi_ata_match(phandle);
1075 bool acpi_device_is_battery(struct acpi_device *adev)
1077 struct acpi_hardware_id *hwid;
1079 list_for_each_entry(hwid, &adev->pnp.ids, list)
1080 if (!strcmp("PNP0C0A", hwid->id))
1086 static bool is_ejectable_bay(struct acpi_device *adev)
1088 acpi_handle handle = adev->handle;
1090 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1093 return acpi_bay_match(handle);
1097 * acpi_dock_match - see if an acpi object has a _DCK method
1099 bool acpi_dock_match(acpi_handle handle)
1101 return acpi_has_method(handle, "_DCK");
1105 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1106 void **return_value)
1108 long *cap = context;
1110 if (acpi_has_method(handle, "_BCM") &&
1111 acpi_has_method(handle, "_BCL")) {
1112 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
1114 *cap |= ACPI_VIDEO_BACKLIGHT;
1115 if (!acpi_has_method(handle, "_BQC"))
1116 printk(KERN_WARNING FW_BUG PREFIX "No _BQC method, "
1117 "cannot determine initial brightness\n");
1118 /* We have backlight support, no need to scan further */
1119 return AE_CTRL_TERMINATE;
1124 /* Returns true if the ACPI object is a video device which can be
1125 * handled by video.ko.
1126 * The device will get a Linux specific CID added in scan.c to
1127 * identify the device as an ACPI graphics device
1128 * Be aware that the graphics device may not be physically present
1129 * Use acpi_video_get_capabilities() to detect general ACPI video
1130 * capabilities of present cards
1132 long acpi_is_video_device(acpi_handle handle)
1134 long video_caps = 0;
1136 /* Is this device able to support video switching ? */
1137 if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1138 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1140 /* Is this device able to retrieve a video ROM ? */
1141 if (acpi_has_method(handle, "_ROM"))
1142 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1144 /* Is this device able to configure which video head to be POSTed ? */
1145 if (acpi_has_method(handle, "_VPO") &&
1146 acpi_has_method(handle, "_GPD") &&
1147 acpi_has_method(handle, "_SPD"))
1148 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1150 /* Only check for backlight functionality if one of the above hit. */
1152 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1153 ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1158 EXPORT_SYMBOL(acpi_is_video_device);
1160 const char *acpi_device_hid(struct acpi_device *device)
1162 struct acpi_hardware_id *hid;
1164 if (list_empty(&device->pnp.ids))
1167 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1170 EXPORT_SYMBOL(acpi_device_hid);
1172 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1174 struct acpi_hardware_id *id;
1176 id = kmalloc(sizeof(*id), GFP_KERNEL);
1180 id->id = kstrdup_const(dev_id, GFP_KERNEL);
1186 list_add_tail(&id->list, &pnp->ids);
1187 pnp->type.hardware_id = 1;
1191 * Old IBM workstations have a DSDT bug wherein the SMBus object
1192 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1193 * prefix. Work around this.
1195 static bool acpi_ibm_smbus_match(acpi_handle handle)
1197 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1198 struct acpi_buffer path = { sizeof(node_name), node_name };
1200 if (!dmi_name_in_vendors("IBM"))
1203 /* Look for SMBS object */
1204 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1205 strcmp("SMBS", path.pointer))
1208 /* Does it have the necessary (but misnamed) methods? */
1209 if (acpi_has_method(handle, "SBI") &&
1210 acpi_has_method(handle, "SBR") &&
1211 acpi_has_method(handle, "SBW"))
1217 static bool acpi_object_is_system_bus(acpi_handle handle)
1221 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1224 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1231 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1235 struct acpi_device_info *info;
1236 struct acpi_pnp_device_id_list *cid_list;
1239 switch (device_type) {
1240 case ACPI_BUS_TYPE_DEVICE:
1241 if (handle == ACPI_ROOT_OBJECT) {
1242 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1246 status = acpi_get_object_info(handle, &info);
1247 if (ACPI_FAILURE(status)) {
1248 pr_err(PREFIX "%s: Error reading device info\n",
1253 if (info->valid & ACPI_VALID_HID) {
1254 acpi_add_id(pnp, info->hardware_id.string);
1255 pnp->type.platform_id = 1;
1257 if (info->valid & ACPI_VALID_CID) {
1258 cid_list = &info->compatible_id_list;
1259 for (i = 0; i < cid_list->count; i++)
1260 acpi_add_id(pnp, cid_list->ids[i].string);
1262 if (info->valid & ACPI_VALID_ADR) {
1263 pnp->bus_address = info->address;
1264 pnp->type.bus_address = 1;
1266 if (info->valid & ACPI_VALID_UID)
1267 pnp->unique_id = kstrdup(info->unique_id.string,
1269 if (info->valid & ACPI_VALID_CLS)
1270 acpi_add_id(pnp, info->class_code.string);
1275 * Some devices don't reliably have _HIDs & _CIDs, so add
1276 * synthetic HIDs to make sure drivers can find them.
1278 if (acpi_is_video_device(handle))
1279 acpi_add_id(pnp, ACPI_VIDEO_HID);
1280 else if (acpi_bay_match(handle))
1281 acpi_add_id(pnp, ACPI_BAY_HID);
1282 else if (acpi_dock_match(handle))
1283 acpi_add_id(pnp, ACPI_DOCK_HID);
1284 else if (acpi_ibm_smbus_match(handle))
1285 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1286 else if (list_empty(&pnp->ids) &&
1287 acpi_object_is_system_bus(handle)) {
1288 /* \_SB, \_TZ, LNXSYBUS */
1289 acpi_add_id(pnp, ACPI_BUS_HID);
1290 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1291 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1295 case ACPI_BUS_TYPE_POWER:
1296 acpi_add_id(pnp, ACPI_POWER_HID);
1298 case ACPI_BUS_TYPE_PROCESSOR:
1299 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1301 case ACPI_BUS_TYPE_THERMAL:
1302 acpi_add_id(pnp, ACPI_THERMAL_HID);
1304 case ACPI_BUS_TYPE_POWER_BUTTON:
1305 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1307 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1308 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1313 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1315 struct acpi_hardware_id *id, *tmp;
1317 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1318 kfree_const(id->id);
1321 kfree(pnp->unique_id);
1325 * acpi_dma_supported - Check DMA support for the specified device.
1326 * @adev: The pointer to acpi device
1328 * Return false if DMA is not supported. Otherwise, return true
1330 bool acpi_dma_supported(struct acpi_device *adev)
1335 if (adev->flags.cca_seen)
1339 * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1340 * DMA on "Intel platforms". Presumably that includes all x86 and
1341 * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1343 if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1350 * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1351 * @adev: The pointer to acpi device
1353 * Return enum dev_dma_attr.
1355 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1357 if (!acpi_dma_supported(adev))
1358 return DEV_DMA_NOT_SUPPORTED;
1360 if (adev->flags.coherent_dma)
1361 return DEV_DMA_COHERENT;
1363 return DEV_DMA_NON_COHERENT;
1366 static void acpi_init_coherency(struct acpi_device *adev)
1368 unsigned long long cca = 0;
1370 struct acpi_device *parent = adev->parent;
1372 if (parent && parent->flags.cca_seen) {
1374 * From ACPI spec, OSPM will ignore _CCA if an ancestor
1377 adev->flags.cca_seen = 1;
1378 cca = parent->flags.coherent_dma;
1380 status = acpi_evaluate_integer(adev->handle, "_CCA",
1382 if (ACPI_SUCCESS(status))
1383 adev->flags.cca_seen = 1;
1384 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1386 * If architecture does not specify that _CCA is
1387 * required for DMA-able devices (e.g. x86),
1388 * we default to _CCA=1.
1392 acpi_handle_debug(adev->handle,
1393 "ACPI device is missing _CCA.\n");
1396 adev->flags.coherent_dma = cca;
1399 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1400 int type, unsigned long long sta)
1402 INIT_LIST_HEAD(&device->pnp.ids);
1403 device->device_type = type;
1404 device->handle = handle;
1405 device->parent = acpi_bus_get_parent(handle);
1406 device->fwnode.type = FWNODE_ACPI;
1407 acpi_set_device_status(device, sta);
1408 acpi_device_get_busid(device);
1409 acpi_set_pnp_ids(handle, &device->pnp, type);
1410 acpi_init_properties(device);
1411 acpi_bus_get_flags(device);
1412 device->flags.match_driver = false;
1413 device->flags.initialized = true;
1414 acpi_device_clear_enumerated(device);
1415 device_initialize(&device->dev);
1416 dev_set_uevent_suppress(&device->dev, true);
1417 acpi_init_coherency(device);
1420 void acpi_device_add_finalize(struct acpi_device *device)
1422 dev_set_uevent_suppress(&device->dev, false);
1423 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1426 static int acpi_add_single_object(struct acpi_device **child,
1427 acpi_handle handle, int type,
1428 unsigned long long sta)
1431 struct acpi_device *device;
1432 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1434 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1436 printk(KERN_ERR PREFIX "Memory allocation error\n");
1440 acpi_init_device_object(device, handle, type, sta);
1441 acpi_bus_get_power_flags(device);
1442 acpi_bus_get_wakeup_device_flags(device);
1444 result = acpi_device_add(device, acpi_device_release);
1446 acpi_device_release(&device->dev);
1450 acpi_power_add_remove_device(device, true);
1451 acpi_device_add_finalize(device);
1452 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1453 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1454 dev_name(&device->dev), (char *) buffer.pointer,
1455 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1456 kfree(buffer.pointer);
1461 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1462 unsigned long long *sta)
1465 acpi_object_type acpi_type;
1467 status = acpi_get_type(handle, &acpi_type);
1468 if (ACPI_FAILURE(status))
1471 switch (acpi_type) {
1472 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1473 case ACPI_TYPE_DEVICE:
1474 *type = ACPI_BUS_TYPE_DEVICE;
1475 status = acpi_bus_get_status_handle(handle, sta);
1476 if (ACPI_FAILURE(status))
1479 case ACPI_TYPE_PROCESSOR:
1480 *type = ACPI_BUS_TYPE_PROCESSOR;
1481 status = acpi_bus_get_status_handle(handle, sta);
1482 if (ACPI_FAILURE(status))
1485 case ACPI_TYPE_THERMAL:
1486 *type = ACPI_BUS_TYPE_THERMAL;
1487 *sta = ACPI_STA_DEFAULT;
1489 case ACPI_TYPE_POWER:
1490 *type = ACPI_BUS_TYPE_POWER;
1491 *sta = ACPI_STA_DEFAULT;
1500 bool acpi_device_is_present(struct acpi_device *adev)
1502 if (adev->status.present || adev->status.functional)
1505 adev->flags.initialized = false;
1509 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1511 const struct acpi_device_id **matchid)
1513 const struct acpi_device_id *devid;
1516 return handler->match(idstr, matchid);
1518 for (devid = handler->ids; devid->id[0]; devid++)
1519 if (!strcmp((char *)devid->id, idstr)) {
1529 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1530 const struct acpi_device_id **matchid)
1532 struct acpi_scan_handler *handler;
1534 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1535 if (acpi_scan_handler_matching(handler, idstr, matchid))
1541 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1543 if (!!hotplug->enabled == !!val)
1546 mutex_lock(&acpi_scan_lock);
1548 hotplug->enabled = val;
1550 mutex_unlock(&acpi_scan_lock);
1553 static void acpi_scan_init_hotplug(struct acpi_device *adev)
1555 struct acpi_hardware_id *hwid;
1557 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1558 acpi_dock_add(adev);
1561 list_for_each_entry(hwid, &adev->pnp.ids, list) {
1562 struct acpi_scan_handler *handler;
1564 handler = acpi_scan_match_handler(hwid->id, NULL);
1566 adev->flags.hotplug_notify = true;
1572 static void acpi_device_dep_initialize(struct acpi_device *adev)
1574 struct acpi_dep_data *dep;
1575 struct acpi_handle_list dep_devices;
1579 if (!acpi_has_method(adev->handle, "_DEP"))
1582 status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
1584 if (ACPI_FAILURE(status)) {
1585 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
1589 for (i = 0; i < dep_devices.count; i++) {
1590 struct acpi_device_info *info;
1593 status = acpi_get_object_info(dep_devices.handles[i], &info);
1594 if (ACPI_FAILURE(status)) {
1595 dev_dbg(&adev->dev, "Error reading _DEP device info\n");
1600 * Skip the dependency of Windows System Power
1601 * Management Controller
1603 skip = info->valid & ACPI_VALID_HID &&
1604 !strcmp(info->hardware_id.string, "INT3396");
1611 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
1615 dep->master = dep_devices.handles[i];
1616 dep->slave = adev->handle;
1619 mutex_lock(&acpi_dep_list_lock);
1620 list_add_tail(&dep->node , &acpi_dep_list);
1621 mutex_unlock(&acpi_dep_list_lock);
1625 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1626 void *not_used, void **return_value)
1628 struct acpi_device *device = NULL;
1630 unsigned long long sta;
1633 acpi_bus_get_device(handle, &device);
1637 result = acpi_bus_type_and_status(handle, &type, &sta);
1641 if (type == ACPI_BUS_TYPE_POWER) {
1642 acpi_add_power_resource(handle);
1646 acpi_add_single_object(&device, handle, type, sta);
1648 return AE_CTRL_DEPTH;
1650 acpi_scan_init_hotplug(device);
1651 acpi_device_dep_initialize(device);
1655 *return_value = device;
1660 static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
1662 bool *is_spi_i2c_slave_p = data;
1664 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1668 * devices that are connected to UART still need to be enumerated to
1671 if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
1672 *is_spi_i2c_slave_p = true;
1674 /* no need to do more checking */
1678 static void acpi_default_enumeration(struct acpi_device *device)
1680 struct list_head resource_list;
1681 bool is_spi_i2c_slave = false;
1684 * Do not enumerate SPI/I2C slaves as they will be enumerated by their
1685 * respective parents.
1687 INIT_LIST_HEAD(&resource_list);
1688 acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
1690 acpi_dev_free_resource_list(&resource_list);
1691 if (!is_spi_i2c_slave) {
1692 acpi_create_platform_device(device);
1693 acpi_device_set_enumerated(device);
1695 blocking_notifier_call_chain(&acpi_reconfig_chain,
1696 ACPI_RECONFIG_DEVICE_ADD, device);
1700 static const struct acpi_device_id generic_device_ids[] = {
1701 {ACPI_DT_NAMESPACE_HID, },
1705 static int acpi_generic_device_attach(struct acpi_device *adev,
1706 const struct acpi_device_id *not_used)
1709 * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
1710 * below can be unconditional.
1712 if (adev->data.of_compatible)
1713 acpi_default_enumeration(adev);
1718 static struct acpi_scan_handler generic_device_handler = {
1719 .ids = generic_device_ids,
1720 .attach = acpi_generic_device_attach,
1723 static int acpi_scan_attach_handler(struct acpi_device *device)
1725 struct acpi_hardware_id *hwid;
1728 list_for_each_entry(hwid, &device->pnp.ids, list) {
1729 const struct acpi_device_id *devid;
1730 struct acpi_scan_handler *handler;
1732 handler = acpi_scan_match_handler(hwid->id, &devid);
1734 if (!handler->attach) {
1735 device->pnp.type.platform_id = 0;
1738 device->handler = handler;
1739 ret = handler->attach(device, devid);
1743 device->handler = NULL;
1752 static void acpi_bus_attach(struct acpi_device *device)
1754 struct acpi_device *child;
1758 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
1759 register_dock_dependent_device(device, ejd);
1761 acpi_bus_get_status(device);
1762 /* Skip devices that are not present. */
1763 if (!acpi_device_is_present(device)) {
1764 acpi_device_clear_enumerated(device);
1765 device->flags.power_manageable = 0;
1768 if (device->handler)
1771 if (!device->flags.initialized) {
1772 device->flags.power_manageable =
1773 device->power.states[ACPI_STATE_D0].flags.valid;
1774 if (acpi_bus_init_power(device))
1775 device->flags.power_manageable = 0;
1777 device->flags.initialized = true;
1780 ret = acpi_scan_attach_handler(device);
1784 device->flags.match_driver = true;
1786 ret = device_attach(&device->dev);
1790 if (!ret && device->pnp.type.platform_id)
1791 acpi_default_enumeration(device);
1795 list_for_each_entry(child, &device->children, node)
1796 acpi_bus_attach(child);
1798 if (device->handler && device->handler->hotplug.notify_online)
1799 device->handler->hotplug.notify_online(device);
1802 void acpi_walk_dep_device_list(acpi_handle handle)
1804 struct acpi_dep_data *dep, *tmp;
1805 struct acpi_device *adev;
1807 mutex_lock(&acpi_dep_list_lock);
1808 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
1809 if (dep->master == handle) {
1810 acpi_bus_get_device(dep->slave, &adev);
1815 if (!adev->dep_unmet)
1816 acpi_bus_attach(adev);
1817 list_del(&dep->node);
1821 mutex_unlock(&acpi_dep_list_lock);
1823 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
1826 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1827 * @handle: Root of the namespace scope to scan.
1829 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1832 * If no devices were found, -ENODEV is returned, but it does not mean that
1833 * there has been a real error. There just have been no suitable ACPI objects
1834 * in the table trunk from which the kernel could create a device and add an
1835 * appropriate driver.
1837 * Must be called under acpi_scan_lock.
1839 int acpi_bus_scan(acpi_handle handle)
1841 void *device = NULL;
1843 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1844 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1845 acpi_bus_check_add, NULL, NULL, &device);
1848 acpi_bus_attach(device);
1853 EXPORT_SYMBOL(acpi_bus_scan);
1856 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
1857 * @adev: Root of the ACPI namespace scope to walk.
1859 * Must be called under acpi_scan_lock.
1861 void acpi_bus_trim(struct acpi_device *adev)
1863 struct acpi_scan_handler *handler = adev->handler;
1864 struct acpi_device *child;
1866 list_for_each_entry_reverse(child, &adev->children, node)
1867 acpi_bus_trim(child);
1869 adev->flags.match_driver = false;
1871 if (handler->detach)
1872 handler->detach(adev);
1874 adev->handler = NULL;
1876 device_release_driver(&adev->dev);
1879 * Most likely, the device is going away, so put it into D3cold before
1882 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
1883 adev->flags.initialized = false;
1884 acpi_device_clear_enumerated(adev);
1886 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1888 static int acpi_bus_scan_fixed(void)
1893 * Enumerate all fixed-feature devices.
1895 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
1896 struct acpi_device *device = NULL;
1898 result = acpi_add_single_object(&device, NULL,
1899 ACPI_BUS_TYPE_POWER_BUTTON,
1904 device->flags.match_driver = true;
1905 result = device_attach(&device->dev);
1909 device_init_wakeup(&device->dev, true);
1912 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
1913 struct acpi_device *device = NULL;
1915 result = acpi_add_single_object(&device, NULL,
1916 ACPI_BUS_TYPE_SLEEP_BUTTON,
1921 device->flags.match_driver = true;
1922 result = device_attach(&device->dev);
1925 return result < 0 ? result : 0;
1928 static bool acpi_scan_initialized;
1930 int __init acpi_scan_init(void)
1934 acpi_pci_root_init();
1935 acpi_pci_link_init();
1936 acpi_processor_init();
1939 acpi_cmos_rtc_init();
1940 acpi_container_init();
1941 acpi_memory_hotplug_init();
1943 acpi_int340x_thermal_init();
1946 acpi_scan_add_handler(&generic_device_handler);
1948 mutex_lock(&acpi_scan_lock);
1950 * Enumerate devices in the ACPI namespace.
1952 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
1956 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
1960 /* Fixed feature devices do not exist on HW-reduced platform */
1961 if (!acpi_gbl_reduced_hardware) {
1962 result = acpi_bus_scan_fixed();
1964 acpi_detach_data(acpi_root->handle,
1965 acpi_scan_drop_device);
1966 acpi_device_del(acpi_root);
1967 put_device(&acpi_root->dev);
1972 acpi_update_all_gpes();
1974 acpi_scan_initialized = true;
1977 mutex_unlock(&acpi_scan_lock);
1981 static struct acpi_probe_entry *ape;
1982 static int acpi_probe_count;
1983 static DEFINE_SPINLOCK(acpi_probe_lock);
1985 static int __init acpi_match_madt(struct acpi_subtable_header *header,
1986 const unsigned long end)
1988 if (!ape->subtable_valid || ape->subtable_valid(header, ape))
1989 if (!ape->probe_subtbl(header, end))
1995 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2002 spin_lock(&acpi_probe_lock);
2003 for (ape = ap_head; nr; ape++, nr--) {
2004 if (ACPI_COMPARE_NAME(ACPI_SIG_MADT, ape->id)) {
2005 acpi_probe_count = 0;
2006 acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2007 count += acpi_probe_count;
2010 res = acpi_table_parse(ape->id, ape->probe_table);
2015 spin_unlock(&acpi_probe_lock);
2020 struct acpi_table_events_work {
2021 struct work_struct work;
2026 static void acpi_table_events_fn(struct work_struct *work)
2028 struct acpi_table_events_work *tew;
2030 tew = container_of(work, struct acpi_table_events_work, work);
2032 if (tew->event == ACPI_TABLE_EVENT_LOAD) {
2033 acpi_scan_lock_acquire();
2034 acpi_bus_scan(ACPI_ROOT_OBJECT);
2035 acpi_scan_lock_release();
2041 void acpi_scan_table_handler(u32 event, void *table, void *context)
2043 struct acpi_table_events_work *tew;
2045 if (!acpi_scan_initialized)
2048 if (event != ACPI_TABLE_EVENT_LOAD)
2051 tew = kmalloc(sizeof(*tew), GFP_KERNEL);
2055 INIT_WORK(&tew->work, acpi_table_events_fn);
2059 schedule_work(&tew->work);
2062 int acpi_reconfig_notifier_register(struct notifier_block *nb)
2064 return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
2066 EXPORT_SYMBOL(acpi_reconfig_notifier_register);
2068 int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
2070 return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
2072 EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);