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