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 if (acpi_device_bus_id->instance_no > 0)
485 acpi_device_bus_id->instance_no--;
487 list_del(&acpi_device_bus_id->node);
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 LIST_HEAD(acpi_device_del_list);
505 static DEFINE_MUTEX(acpi_device_del_lock);
507 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
510 struct acpi_device *adev;
512 mutex_lock(&acpi_device_del_lock);
514 if (list_empty(&acpi_device_del_list)) {
515 mutex_unlock(&acpi_device_del_lock);
518 adev = list_first_entry(&acpi_device_del_list,
519 struct acpi_device, del_list);
520 list_del(&adev->del_list);
522 mutex_unlock(&acpi_device_del_lock);
524 acpi_device_del(adev);
526 * Drop references to all power resources that might have been
527 * used by the device.
529 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
530 put_device(&adev->dev);
535 * acpi_scan_drop_device - Drop an ACPI device object.
536 * @handle: Handle of an ACPI namespace node, not used.
537 * @context: Address of the ACPI device object to drop.
539 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
540 * namespace node the device object pointed to by @context is attached to.
542 * The unregistration is carried out asynchronously to avoid running
543 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
544 * ensure the correct ordering (the device objects must be unregistered in the
545 * same order in which the corresponding namespace nodes are deleted).
547 static void acpi_scan_drop_device(acpi_handle handle, void *context)
549 static DECLARE_WORK(work, acpi_device_del_work_fn);
550 struct acpi_device *adev = context;
552 mutex_lock(&acpi_device_del_lock);
555 * Use the ACPI hotplug workqueue which is ordered, so this work item
556 * won't run after any hotplug work items submitted subsequently. That
557 * prevents attempts to register device objects identical to those being
558 * deleted from happening concurrently (such attempts result from
559 * hotplug events handled via the ACPI hotplug workqueue). It also will
560 * run after all of the work items submitted previosuly, which helps
561 * those work items to ensure that they are not accessing stale device
564 if (list_empty(&acpi_device_del_list))
565 acpi_queue_hotplug_work(&work);
567 list_add_tail(&adev->del_list, &acpi_device_del_list);
568 /* Make acpi_ns_validate_handle() return NULL for this handle. */
569 adev->handle = INVALID_ACPI_HANDLE;
571 mutex_unlock(&acpi_device_del_lock);
574 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
575 void (*callback)(void *))
582 status = acpi_get_data_full(handle, acpi_scan_drop_device,
583 (void **)device, callback);
584 if (ACPI_FAILURE(status) || !*device) {
585 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
592 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
594 return acpi_get_device_data(handle, device, NULL);
596 EXPORT_SYMBOL(acpi_bus_get_device);
598 static void get_acpi_device(void *dev)
601 get_device(&((struct acpi_device *)dev)->dev);
604 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
606 struct acpi_device *adev = NULL;
608 acpi_get_device_data(handle, &adev, get_acpi_device);
612 void acpi_bus_put_acpi_device(struct acpi_device *adev)
614 put_device(&adev->dev);
617 int acpi_device_add(struct acpi_device *device,
618 void (*release)(struct device *))
621 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
624 if (device->handle) {
627 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
629 if (ACPI_FAILURE(status)) {
630 acpi_handle_err(device->handle,
631 "Unable to attach device data\n");
639 * Link this device to its parent and siblings.
641 INIT_LIST_HEAD(&device->children);
642 INIT_LIST_HEAD(&device->node);
643 INIT_LIST_HEAD(&device->wakeup_list);
644 INIT_LIST_HEAD(&device->physical_node_list);
645 INIT_LIST_HEAD(&device->del_list);
646 mutex_init(&device->physical_node_lock);
648 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
650 pr_err(PREFIX "Memory allocation error\n");
655 mutex_lock(&acpi_device_lock);
657 * Find suitable bus_id and instance number in acpi_bus_id_list
658 * If failed, create one and link it into acpi_bus_id_list
660 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
661 if (!strcmp(acpi_device_bus_id->bus_id,
662 acpi_device_hid(device))) {
663 acpi_device_bus_id->instance_no++;
670 acpi_device_bus_id = new_bus_id;
671 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
672 acpi_device_bus_id->instance_no = 0;
673 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
675 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
678 list_add_tail(&device->node, &device->parent->children);
680 if (device->wakeup.flags.valid)
681 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
682 mutex_unlock(&acpi_device_lock);
685 device->dev.parent = &device->parent->dev;
686 device->dev.bus = &acpi_bus_type;
687 device->dev.release = release;
688 result = device_add(&device->dev);
690 dev_err(&device->dev, "Error registering device\n");
694 result = acpi_device_setup_files(device);
696 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
697 dev_name(&device->dev));
702 mutex_lock(&acpi_device_lock);
704 list_del(&device->node);
705 list_del(&device->wakeup_list);
706 mutex_unlock(&acpi_device_lock);
709 acpi_detach_data(device->handle, acpi_scan_drop_device);
713 /* --------------------------------------------------------------------------
715 -------------------------------------------------------------------------- */
716 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
718 struct acpi_device *device = NULL;
722 * Fixed hardware devices do not appear in the namespace and do not
723 * have handles, but we fabricate acpi_devices for them, so we have
724 * to deal with them specially.
730 status = acpi_get_parent(handle, &handle);
731 if (ACPI_FAILURE(status))
732 return status == AE_NULL_ENTRY ? NULL : acpi_root;
733 } while (acpi_bus_get_device(handle, &device));
738 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
742 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
743 union acpi_object *obj;
745 status = acpi_get_handle(handle, "_EJD", &tmp);
746 if (ACPI_FAILURE(status))
749 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
750 if (ACPI_SUCCESS(status)) {
751 obj = buffer.pointer;
752 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
754 kfree(buffer.pointer);
758 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
760 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
761 struct acpi_device_wakeup *wakeup)
763 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
764 union acpi_object *package = NULL;
765 union acpi_object *element = NULL;
772 INIT_LIST_HEAD(&wakeup->resources);
775 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
776 if (ACPI_FAILURE(status)) {
777 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
781 package = (union acpi_object *)buffer.pointer;
783 if (!package || package->package.count < 2)
786 element = &(package->package.elements[0]);
790 if (element->type == ACPI_TYPE_PACKAGE) {
791 if ((element->package.count < 2) ||
792 (element->package.elements[0].type !=
793 ACPI_TYPE_LOCAL_REFERENCE)
794 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
798 element->package.elements[0].reference.handle;
800 (u32) element->package.elements[1].integer.value;
801 } else if (element->type == ACPI_TYPE_INTEGER) {
802 wakeup->gpe_device = NULL;
803 wakeup->gpe_number = element->integer.value;
808 element = &(package->package.elements[1]);
809 if (element->type != ACPI_TYPE_INTEGER)
812 wakeup->sleep_state = element->integer.value;
814 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
818 if (!list_empty(&wakeup->resources)) {
821 err = acpi_power_wakeup_list_init(&wakeup->resources,
824 acpi_handle_warn(handle, "Retrieving current states "
825 "of wakeup power resources failed\n");
826 acpi_power_resources_list_free(&wakeup->resources);
829 if (sleep_state < wakeup->sleep_state) {
830 acpi_handle_warn(handle, "Overriding _PRW sleep state "
831 "(S%d) by S%d from power resources\n",
832 (int)wakeup->sleep_state, sleep_state);
833 wakeup->sleep_state = sleep_state;
838 kfree(buffer.pointer);
842 static void acpi_wakeup_gpe_init(struct acpi_device *device)
844 static const struct acpi_device_id button_device_ids[] = {
850 struct acpi_device_wakeup *wakeup = &device->wakeup;
852 acpi_event_status event_status;
854 wakeup->flags.notifier_present = 0;
856 /* Power button, Lid switch always enable wakeup */
857 if (!acpi_match_device_ids(device, button_device_ids)) {
858 wakeup->flags.run_wake = 1;
859 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
860 /* Do not use Lid/sleep button for S5 wakeup */
861 if (wakeup->sleep_state == ACPI_STATE_S5)
862 wakeup->sleep_state = ACPI_STATE_S4;
864 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
865 device_set_wakeup_capable(&device->dev, true);
869 acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
871 status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number,
873 if (ACPI_FAILURE(status))
876 wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HAS_HANDLER);
879 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
883 /* Presence of _PRW indicates wake capable */
884 if (!acpi_has_method(device->handle, "_PRW"))
887 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
890 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
894 device->wakeup.flags.valid = 1;
895 device->wakeup.prepare_count = 0;
896 acpi_wakeup_gpe_init(device);
897 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
898 * system for the ACPI device with the _PRW object.
899 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
900 * So it is necessary to call _DSW object first. Only when it is not
901 * present will the _PSW object used.
903 err = acpi_device_sleep_wake(device, 0, 0, 0);
905 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
906 "error in _DSW or _PSW evaluation\n"));
909 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
911 struct acpi_device_power_state *ps = &device->power.states[state];
912 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
913 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
916 INIT_LIST_HEAD(&ps->resources);
918 /* Evaluate "_PRx" to get referenced power resources */
919 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
920 if (ACPI_SUCCESS(status)) {
921 union acpi_object *package = buffer.pointer;
923 if (buffer.length && package
924 && package->type == ACPI_TYPE_PACKAGE
925 && package->package.count) {
926 int err = acpi_extract_power_resources(package, 0,
929 device->power.flags.power_resources = 1;
931 ACPI_FREE(buffer.pointer);
934 /* Evaluate "_PSx" to see if we can do explicit sets */
936 if (acpi_has_method(device->handle, pathname))
937 ps->flags.explicit_set = 1;
939 /* State is valid if there are means to put the device into it. */
940 if (!list_empty(&ps->resources) || ps->flags.explicit_set)
943 ps->power = -1; /* Unknown - driver assigned */
944 ps->latency = -1; /* Unknown - driver assigned */
947 static void acpi_bus_get_power_flags(struct acpi_device *device)
951 /* Presence of _PS0|_PR0 indicates 'power manageable' */
952 if (!acpi_has_method(device->handle, "_PS0") &&
953 !acpi_has_method(device->handle, "_PR0"))
956 device->flags.power_manageable = 1;
959 * Power Management Flags
961 if (acpi_has_method(device->handle, "_PSC"))
962 device->power.flags.explicit_get = 1;
964 if (acpi_has_method(device->handle, "_IRC"))
965 device->power.flags.inrush_current = 1;
967 if (acpi_has_method(device->handle, "_DSW"))
968 device->power.flags.dsw_present = 1;
971 * Enumerate supported power management states
973 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
974 acpi_bus_init_power_state(device, i);
976 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
977 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
978 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
980 /* Set defaults for D0 and D3hot states (always valid) */
981 device->power.states[ACPI_STATE_D0].flags.valid = 1;
982 device->power.states[ACPI_STATE_D0].power = 100;
983 device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
985 if (acpi_bus_init_power(device))
986 device->flags.power_manageable = 0;
989 static void acpi_bus_get_flags(struct acpi_device *device)
991 /* Presence of _STA indicates 'dynamic_status' */
992 if (acpi_has_method(device->handle, "_STA"))
993 device->flags.dynamic_status = 1;
995 /* Presence of _RMV indicates 'removable' */
996 if (acpi_has_method(device->handle, "_RMV"))
997 device->flags.removable = 1;
999 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1000 if (acpi_has_method(device->handle, "_EJD") ||
1001 acpi_has_method(device->handle, "_EJ0"))
1002 device->flags.ejectable = 1;
1005 static void acpi_device_get_busid(struct acpi_device *device)
1007 char bus_id[5] = { '?', 0 };
1008 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1014 * The device's Bus ID is simply the object name.
1015 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1017 if (ACPI_IS_ROOT_DEVICE(device)) {
1018 strcpy(device->pnp.bus_id, "ACPI");
1022 switch (device->device_type) {
1023 case ACPI_BUS_TYPE_POWER_BUTTON:
1024 strcpy(device->pnp.bus_id, "PWRF");
1026 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1027 strcpy(device->pnp.bus_id, "SLPF");
1030 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1031 /* Clean up trailing underscores (if any) */
1032 for (i = 3; i > 1; i--) {
1033 if (bus_id[i] == '_')
1038 strcpy(device->pnp.bus_id, bus_id);
1044 * acpi_ata_match - see if an acpi object is an ATA device
1046 * If an acpi object has one of the ACPI ATA methods defined,
1047 * then we can safely call it an ATA device.
1049 bool acpi_ata_match(acpi_handle handle)
1051 return acpi_has_method(handle, "_GTF") ||
1052 acpi_has_method(handle, "_GTM") ||
1053 acpi_has_method(handle, "_STM") ||
1054 acpi_has_method(handle, "_SDD");
1058 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1060 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1061 * then we can safely call it an ejectable drive bay
1063 bool acpi_bay_match(acpi_handle handle)
1065 acpi_handle phandle;
1067 if (!acpi_has_method(handle, "_EJ0"))
1069 if (acpi_ata_match(handle))
1071 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1074 return acpi_ata_match(phandle);
1077 bool acpi_device_is_battery(struct acpi_device *adev)
1079 struct acpi_hardware_id *hwid;
1081 list_for_each_entry(hwid, &adev->pnp.ids, list)
1082 if (!strcmp("PNP0C0A", hwid->id))
1088 static bool is_ejectable_bay(struct acpi_device *adev)
1090 acpi_handle handle = adev->handle;
1092 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1095 return acpi_bay_match(handle);
1099 * acpi_dock_match - see if an acpi object has a _DCK method
1101 bool acpi_dock_match(acpi_handle handle)
1103 return acpi_has_method(handle, "_DCK");
1107 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1108 void **return_value)
1110 long *cap = context;
1112 if (acpi_has_method(handle, "_BCM") &&
1113 acpi_has_method(handle, "_BCL")) {
1114 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
1116 *cap |= ACPI_VIDEO_BACKLIGHT;
1117 if (!acpi_has_method(handle, "_BQC"))
1118 printk(KERN_WARNING FW_BUG PREFIX "No _BQC method, "
1119 "cannot determine initial brightness\n");
1120 /* We have backlight support, no need to scan further */
1121 return AE_CTRL_TERMINATE;
1126 /* Returns true if the ACPI object is a video device which can be
1127 * handled by video.ko.
1128 * The device will get a Linux specific CID added in scan.c to
1129 * identify the device as an ACPI graphics device
1130 * Be aware that the graphics device may not be physically present
1131 * Use acpi_video_get_capabilities() to detect general ACPI video
1132 * capabilities of present cards
1134 long acpi_is_video_device(acpi_handle handle)
1136 long video_caps = 0;
1138 /* Is this device able to support video switching ? */
1139 if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1140 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1142 /* Is this device able to retrieve a video ROM ? */
1143 if (acpi_has_method(handle, "_ROM"))
1144 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1146 /* Is this device able to configure which video head to be POSTed ? */
1147 if (acpi_has_method(handle, "_VPO") &&
1148 acpi_has_method(handle, "_GPD") &&
1149 acpi_has_method(handle, "_SPD"))
1150 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1152 /* Only check for backlight functionality if one of the above hit. */
1154 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1155 ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1160 EXPORT_SYMBOL(acpi_is_video_device);
1162 const char *acpi_device_hid(struct acpi_device *device)
1164 struct acpi_hardware_id *hid;
1166 if (list_empty(&device->pnp.ids))
1169 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1172 EXPORT_SYMBOL(acpi_device_hid);
1174 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1176 struct acpi_hardware_id *id;
1178 id = kmalloc(sizeof(*id), GFP_KERNEL);
1182 id->id = kstrdup_const(dev_id, GFP_KERNEL);
1188 list_add_tail(&id->list, &pnp->ids);
1189 pnp->type.hardware_id = 1;
1193 * Old IBM workstations have a DSDT bug wherein the SMBus object
1194 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1195 * prefix. Work around this.
1197 static bool acpi_ibm_smbus_match(acpi_handle handle)
1199 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1200 struct acpi_buffer path = { sizeof(node_name), node_name };
1202 if (!dmi_name_in_vendors("IBM"))
1205 /* Look for SMBS object */
1206 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1207 strcmp("SMBS", path.pointer))
1210 /* Does it have the necessary (but misnamed) methods? */
1211 if (acpi_has_method(handle, "SBI") &&
1212 acpi_has_method(handle, "SBR") &&
1213 acpi_has_method(handle, "SBW"))
1219 static bool acpi_object_is_system_bus(acpi_handle handle)
1223 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1226 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1233 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1237 struct acpi_device_info *info;
1238 struct acpi_pnp_device_id_list *cid_list;
1241 switch (device_type) {
1242 case ACPI_BUS_TYPE_DEVICE:
1243 if (handle == ACPI_ROOT_OBJECT) {
1244 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1248 status = acpi_get_object_info(handle, &info);
1249 if (ACPI_FAILURE(status)) {
1250 pr_err(PREFIX "%s: Error reading device info\n",
1255 if (info->valid & ACPI_VALID_HID) {
1256 acpi_add_id(pnp, info->hardware_id.string);
1257 pnp->type.platform_id = 1;
1259 if (info->valid & ACPI_VALID_CID) {
1260 cid_list = &info->compatible_id_list;
1261 for (i = 0; i < cid_list->count; i++)
1262 acpi_add_id(pnp, cid_list->ids[i].string);
1264 if (info->valid & ACPI_VALID_ADR) {
1265 pnp->bus_address = info->address;
1266 pnp->type.bus_address = 1;
1268 if (info->valid & ACPI_VALID_UID)
1269 pnp->unique_id = kstrdup(info->unique_id.string,
1271 if (info->valid & ACPI_VALID_CLS)
1272 acpi_add_id(pnp, info->class_code.string);
1277 * Some devices don't reliably have _HIDs & _CIDs, so add
1278 * synthetic HIDs to make sure drivers can find them.
1280 if (acpi_is_video_device(handle))
1281 acpi_add_id(pnp, ACPI_VIDEO_HID);
1282 else if (acpi_bay_match(handle))
1283 acpi_add_id(pnp, ACPI_BAY_HID);
1284 else if (acpi_dock_match(handle))
1285 acpi_add_id(pnp, ACPI_DOCK_HID);
1286 else if (acpi_ibm_smbus_match(handle))
1287 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1288 else if (list_empty(&pnp->ids) &&
1289 acpi_object_is_system_bus(handle)) {
1290 /* \_SB, \_TZ, LNXSYBUS */
1291 acpi_add_id(pnp, ACPI_BUS_HID);
1292 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1293 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1297 case ACPI_BUS_TYPE_POWER:
1298 acpi_add_id(pnp, ACPI_POWER_HID);
1300 case ACPI_BUS_TYPE_PROCESSOR:
1301 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1303 case ACPI_BUS_TYPE_THERMAL:
1304 acpi_add_id(pnp, ACPI_THERMAL_HID);
1306 case ACPI_BUS_TYPE_POWER_BUTTON:
1307 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1309 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1310 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1315 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1317 struct acpi_hardware_id *id, *tmp;
1319 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1320 kfree_const(id->id);
1323 kfree(pnp->unique_id);
1327 * acpi_dma_supported - Check DMA support for the specified device.
1328 * @adev: The pointer to acpi device
1330 * Return false if DMA is not supported. Otherwise, return true
1332 bool acpi_dma_supported(struct acpi_device *adev)
1337 if (adev->flags.cca_seen)
1341 * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1342 * DMA on "Intel platforms". Presumably that includes all x86 and
1343 * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1345 if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1352 * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1353 * @adev: The pointer to acpi device
1355 * Return enum dev_dma_attr.
1357 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
1359 if (!acpi_dma_supported(adev))
1360 return DEV_DMA_NOT_SUPPORTED;
1362 if (adev->flags.coherent_dma)
1363 return DEV_DMA_COHERENT;
1365 return DEV_DMA_NON_COHERENT;
1368 static void acpi_init_coherency(struct acpi_device *adev)
1370 unsigned long long cca = 0;
1372 struct acpi_device *parent = adev->parent;
1374 if (parent && parent->flags.cca_seen) {
1376 * From ACPI spec, OSPM will ignore _CCA if an ancestor
1379 adev->flags.cca_seen = 1;
1380 cca = parent->flags.coherent_dma;
1382 status = acpi_evaluate_integer(adev->handle, "_CCA",
1384 if (ACPI_SUCCESS(status))
1385 adev->flags.cca_seen = 1;
1386 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
1388 * If architecture does not specify that _CCA is
1389 * required for DMA-able devices (e.g. x86),
1390 * we default to _CCA=1.
1394 acpi_handle_debug(adev->handle,
1395 "ACPI device is missing _CCA.\n");
1398 adev->flags.coherent_dma = cca;
1401 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1402 int type, unsigned long long sta)
1404 INIT_LIST_HEAD(&device->pnp.ids);
1405 device->device_type = type;
1406 device->handle = handle;
1407 device->parent = acpi_bus_get_parent(handle);
1408 device->fwnode.type = FWNODE_ACPI;
1409 acpi_set_device_status(device, sta);
1410 acpi_device_get_busid(device);
1411 acpi_set_pnp_ids(handle, &device->pnp, type);
1412 acpi_init_properties(device);
1413 acpi_bus_get_flags(device);
1414 device->flags.match_driver = false;
1415 device->flags.initialized = true;
1416 device->flags.visited = false;
1417 device_initialize(&device->dev);
1418 dev_set_uevent_suppress(&device->dev, true);
1419 acpi_init_coherency(device);
1422 void acpi_device_add_finalize(struct acpi_device *device)
1424 dev_set_uevent_suppress(&device->dev, false);
1425 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1428 static int acpi_add_single_object(struct acpi_device **child,
1429 acpi_handle handle, int type,
1430 unsigned long long sta)
1433 struct acpi_device *device;
1434 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1436 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1438 printk(KERN_ERR PREFIX "Memory allocation error\n");
1442 acpi_init_device_object(device, handle, type, sta);
1443 acpi_bus_get_power_flags(device);
1444 acpi_bus_get_wakeup_device_flags(device);
1446 result = acpi_device_add(device, acpi_device_release);
1448 acpi_device_release(&device->dev);
1452 acpi_power_add_remove_device(device, true);
1453 acpi_device_add_finalize(device);
1454 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1455 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1456 dev_name(&device->dev), (char *) buffer.pointer,
1457 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1458 kfree(buffer.pointer);
1463 static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
1466 struct resource *res = context;
1468 if (acpi_dev_resource_memory(ares, res))
1469 return AE_CTRL_TERMINATE;
1474 static bool acpi_device_should_be_hidden(acpi_handle handle)
1477 struct resource res;
1479 /* Check if it should ignore the UART device */
1480 if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
1484 * The UART device described in SPCR table is assumed to have only one
1485 * memory resource present. So we only look for the first one here.
1487 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1488 acpi_get_resource_memory, &res);
1489 if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
1492 acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
1498 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1499 unsigned long long *sta)
1502 acpi_object_type acpi_type;
1504 status = acpi_get_type(handle, &acpi_type);
1505 if (ACPI_FAILURE(status))
1508 switch (acpi_type) {
1509 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1510 case ACPI_TYPE_DEVICE:
1511 if (acpi_device_should_be_hidden(handle))
1514 *type = ACPI_BUS_TYPE_DEVICE;
1515 status = acpi_bus_get_status_handle(handle, sta);
1516 if (ACPI_FAILURE(status))
1519 case ACPI_TYPE_PROCESSOR:
1520 *type = ACPI_BUS_TYPE_PROCESSOR;
1521 status = acpi_bus_get_status_handle(handle, sta);
1522 if (ACPI_FAILURE(status))
1525 case ACPI_TYPE_THERMAL:
1526 *type = ACPI_BUS_TYPE_THERMAL;
1527 *sta = ACPI_STA_DEFAULT;
1529 case ACPI_TYPE_POWER:
1530 *type = ACPI_BUS_TYPE_POWER;
1531 *sta = ACPI_STA_DEFAULT;
1540 bool acpi_device_is_present(struct acpi_device *adev)
1542 if (adev->status.present || adev->status.functional)
1545 adev->flags.initialized = false;
1549 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1551 const struct acpi_device_id **matchid)
1553 const struct acpi_device_id *devid;
1556 return handler->match(idstr, matchid);
1558 for (devid = handler->ids; devid->id[0]; devid++)
1559 if (!strcmp((char *)devid->id, idstr)) {
1569 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
1570 const struct acpi_device_id **matchid)
1572 struct acpi_scan_handler *handler;
1574 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1575 if (acpi_scan_handler_matching(handler, idstr, matchid))
1581 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1583 if (!!hotplug->enabled == !!val)
1586 mutex_lock(&acpi_scan_lock);
1588 hotplug->enabled = val;
1590 mutex_unlock(&acpi_scan_lock);
1593 static void acpi_scan_init_hotplug(struct acpi_device *adev)
1595 struct acpi_hardware_id *hwid;
1597 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
1598 acpi_dock_add(adev);
1601 list_for_each_entry(hwid, &adev->pnp.ids, list) {
1602 struct acpi_scan_handler *handler;
1604 handler = acpi_scan_match_handler(hwid->id, NULL);
1606 adev->flags.hotplug_notify = true;
1612 static void acpi_device_dep_initialize(struct acpi_device *adev)
1614 struct acpi_dep_data *dep;
1615 struct acpi_handle_list dep_devices;
1619 if (!acpi_has_method(adev->handle, "_DEP"))
1622 status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
1624 if (ACPI_FAILURE(status)) {
1625 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
1629 for (i = 0; i < dep_devices.count; i++) {
1630 struct acpi_device_info *info;
1633 status = acpi_get_object_info(dep_devices.handles[i], &info);
1634 if (ACPI_FAILURE(status)) {
1635 dev_dbg(&adev->dev, "Error reading _DEP device info\n");
1640 * Skip the dependency of Windows System Power
1641 * Management Controller
1643 skip = info->valid & ACPI_VALID_HID &&
1644 !strcmp(info->hardware_id.string, "INT3396");
1651 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
1655 dep->master = dep_devices.handles[i];
1656 dep->slave = adev->handle;
1659 mutex_lock(&acpi_dep_list_lock);
1660 list_add_tail(&dep->node , &acpi_dep_list);
1661 mutex_unlock(&acpi_dep_list_lock);
1665 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1666 void *not_used, void **return_value)
1668 struct acpi_device *device = NULL;
1670 unsigned long long sta;
1673 acpi_bus_get_device(handle, &device);
1677 result = acpi_bus_type_and_status(handle, &type, &sta);
1681 if (type == ACPI_BUS_TYPE_POWER) {
1682 acpi_add_power_resource(handle);
1686 acpi_add_single_object(&device, handle, type, sta);
1688 return AE_CTRL_DEPTH;
1690 acpi_scan_init_hotplug(device);
1691 acpi_device_dep_initialize(device);
1695 *return_value = device;
1700 static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
1702 bool *is_spi_i2c_slave_p = data;
1704 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
1708 * devices that are connected to UART still need to be enumerated to
1711 if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
1712 *is_spi_i2c_slave_p = true;
1714 /* no need to do more checking */
1718 static void acpi_default_enumeration(struct acpi_device *device)
1720 struct list_head resource_list;
1721 bool is_spi_i2c_slave = false;
1724 * Do not enemerate SPI/I2C slaves as they will be enuerated by their
1725 * respective parents.
1727 INIT_LIST_HEAD(&resource_list);
1728 acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
1730 acpi_dev_free_resource_list(&resource_list);
1731 if (!is_spi_i2c_slave)
1732 acpi_create_platform_device(device);
1735 static const struct acpi_device_id generic_device_ids[] = {
1736 {ACPI_DT_NAMESPACE_HID, },
1740 static int acpi_generic_device_attach(struct acpi_device *adev,
1741 const struct acpi_device_id *not_used)
1744 * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
1745 * below can be unconditional.
1747 if (adev->data.of_compatible)
1748 acpi_default_enumeration(adev);
1753 static struct acpi_scan_handler generic_device_handler = {
1754 .ids = generic_device_ids,
1755 .attach = acpi_generic_device_attach,
1758 static int acpi_scan_attach_handler(struct acpi_device *device)
1760 struct acpi_hardware_id *hwid;
1763 list_for_each_entry(hwid, &device->pnp.ids, list) {
1764 const struct acpi_device_id *devid;
1765 struct acpi_scan_handler *handler;
1767 handler = acpi_scan_match_handler(hwid->id, &devid);
1769 if (!handler->attach) {
1770 device->pnp.type.platform_id = 0;
1773 device->handler = handler;
1774 ret = handler->attach(device, devid);
1778 device->handler = NULL;
1787 static void acpi_bus_attach(struct acpi_device *device)
1789 struct acpi_device *child;
1793 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
1794 register_dock_dependent_device(device, ejd);
1796 acpi_bus_get_status(device);
1797 /* Skip devices that are not present. */
1798 if (!acpi_device_is_present(device)) {
1799 device->flags.visited = false;
1800 device->flags.power_manageable = 0;
1803 if (device->handler)
1806 if (!device->flags.initialized) {
1807 device->flags.power_manageable =
1808 device->power.states[ACPI_STATE_D0].flags.valid;
1809 if (acpi_bus_init_power(device))
1810 device->flags.power_manageable = 0;
1812 device->flags.initialized = true;
1814 device->flags.visited = false;
1815 ret = acpi_scan_attach_handler(device);
1819 device->flags.match_driver = true;
1821 ret = device_attach(&device->dev);
1825 if (!ret && device->pnp.type.platform_id)
1826 acpi_default_enumeration(device);
1828 device->flags.visited = true;
1831 list_for_each_entry(child, &device->children, node)
1832 acpi_bus_attach(child);
1834 if (device->handler && device->handler->hotplug.notify_online)
1835 device->handler->hotplug.notify_online(device);
1838 void acpi_walk_dep_device_list(acpi_handle handle)
1840 struct acpi_dep_data *dep, *tmp;
1841 struct acpi_device *adev;
1843 mutex_lock(&acpi_dep_list_lock);
1844 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
1845 if (dep->master == handle) {
1846 acpi_bus_get_device(dep->slave, &adev);
1851 if (!adev->dep_unmet)
1852 acpi_bus_attach(adev);
1853 list_del(&dep->node);
1857 mutex_unlock(&acpi_dep_list_lock);
1859 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
1862 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1863 * @handle: Root of the namespace scope to scan.
1865 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1868 * If no devices were found, -ENODEV is returned, but it does not mean that
1869 * there has been a real error. There just have been no suitable ACPI objects
1870 * in the table trunk from which the kernel could create a device and add an
1871 * appropriate driver.
1873 * Must be called under acpi_scan_lock.
1875 int acpi_bus_scan(acpi_handle handle)
1877 void *device = NULL;
1879 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1880 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1881 acpi_bus_check_add, NULL, NULL, &device);
1884 acpi_bus_attach(device);
1889 EXPORT_SYMBOL(acpi_bus_scan);
1892 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
1893 * @adev: Root of the ACPI namespace scope to walk.
1895 * Must be called under acpi_scan_lock.
1897 void acpi_bus_trim(struct acpi_device *adev)
1899 struct acpi_scan_handler *handler = adev->handler;
1900 struct acpi_device *child;
1902 list_for_each_entry_reverse(child, &adev->children, node)
1903 acpi_bus_trim(child);
1905 adev->flags.match_driver = false;
1907 if (handler->detach)
1908 handler->detach(adev);
1910 adev->handler = NULL;
1912 device_release_driver(&adev->dev);
1915 * Most likely, the device is going away, so put it into D3cold before
1918 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
1919 adev->flags.initialized = false;
1920 adev->flags.visited = false;
1922 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1924 static int acpi_bus_scan_fixed(void)
1929 * Enumerate all fixed-feature devices.
1931 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
1932 struct acpi_device *device = NULL;
1934 result = acpi_add_single_object(&device, NULL,
1935 ACPI_BUS_TYPE_POWER_BUTTON,
1940 device->flags.match_driver = true;
1941 result = device_attach(&device->dev);
1945 device_init_wakeup(&device->dev, true);
1948 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
1949 struct acpi_device *device = NULL;
1951 result = acpi_add_single_object(&device, NULL,
1952 ACPI_BUS_TYPE_SLEEP_BUTTON,
1957 device->flags.match_driver = true;
1958 result = device_attach(&device->dev);
1961 return result < 0 ? result : 0;
1964 static void __init acpi_get_spcr_uart_addr(void)
1967 struct acpi_table_spcr *spcr_ptr;
1969 status = acpi_get_table(ACPI_SIG_SPCR, 0,
1970 (struct acpi_table_header **)&spcr_ptr);
1971 if (ACPI_SUCCESS(status))
1972 spcr_uart_addr = spcr_ptr->serial_port.address;
1974 printk(KERN_WARNING PREFIX "STAO table present, but SPCR is missing\n");
1977 int __init acpi_scan_init(void)
1981 struct acpi_table_stao *stao_ptr;
1983 acpi_pci_root_init();
1984 acpi_pci_link_init();
1985 acpi_processor_init();
1988 acpi_cmos_rtc_init();
1989 acpi_container_init();
1990 acpi_memory_hotplug_init();
1992 acpi_int340x_thermal_init();
1995 acpi_scan_add_handler(&generic_device_handler);
1998 * If there is STAO table, check whether it needs to ignore the UART
1999 * device in SPCR table.
2001 status = acpi_get_table(ACPI_SIG_STAO, 0,
2002 (struct acpi_table_header **)&stao_ptr);
2003 if (ACPI_SUCCESS(status)) {
2004 if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
2005 printk(KERN_INFO PREFIX "STAO Name List not yet supported.");
2007 if (stao_ptr->ignore_uart)
2008 acpi_get_spcr_uart_addr();
2011 mutex_lock(&acpi_scan_lock);
2013 * Enumerate devices in the ACPI namespace.
2015 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2019 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2023 /* Fixed feature devices do not exist on HW-reduced platform */
2024 if (!acpi_gbl_reduced_hardware) {
2025 result = acpi_bus_scan_fixed();
2027 acpi_detach_data(acpi_root->handle,
2028 acpi_scan_drop_device);
2029 acpi_device_del(acpi_root);
2030 put_device(&acpi_root->dev);
2035 acpi_update_all_gpes();
2038 mutex_unlock(&acpi_scan_lock);
2042 static struct acpi_probe_entry *ape;
2043 static int acpi_probe_count;
2044 static DEFINE_SPINLOCK(acpi_probe_lock);
2046 static int __init acpi_match_madt(struct acpi_subtable_header *header,
2047 const unsigned long end)
2049 if (!ape->subtable_valid || ape->subtable_valid(header, ape))
2050 if (!ape->probe_subtbl(header, end))
2056 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
2063 spin_lock(&acpi_probe_lock);
2064 for (ape = ap_head; nr; ape++, nr--) {
2065 if (ACPI_COMPARE_NAME(ACPI_SIG_MADT, ape->id)) {
2066 acpi_probe_count = 0;
2067 acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
2068 count += acpi_probe_count;
2071 res = acpi_table_parse(ape->id, ape->probe_table);
2076 spin_unlock(&acpi_probe_lock);