2 * scan.c - support for transforming the ACPI namespace into individual objects
5 #include <linux/module.h>
6 #include <linux/init.h>
7 #include <linux/slab.h>
8 #include <linux/kernel.h>
9 #include <linux/acpi.h>
10 #include <linux/acpi_iort.h>
11 #include <linux/signal.h>
12 #include <linux/kthread.h>
13 #include <linux/dmi.h>
14 #include <linux/nls.h>
15 #include <linux/dma-mapping.h>
17 #include <asm/pgtable.h>
21 #define _COMPONENT ACPI_BUS_COMPONENT
22 ACPI_MODULE_NAME("scan");
23 extern struct acpi_device
*acpi_root
;
25 #define ACPI_BUS_CLASS "system_bus"
26 #define ACPI_BUS_HID "LNXSYBUS"
27 #define ACPI_BUS_DEVICE_NAME "System Bus"
29 #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
31 #define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page)
33 static const char *dummy_hid
= "device";
35 static LIST_HEAD(acpi_dep_list
);
36 static DEFINE_MUTEX(acpi_dep_list_lock
);
37 LIST_HEAD(acpi_bus_id_list
);
38 static DEFINE_MUTEX(acpi_scan_lock
);
39 static LIST_HEAD(acpi_scan_handlers_list
);
40 DEFINE_MUTEX(acpi_device_lock
);
41 LIST_HEAD(acpi_wakeup_device_list
);
42 static DEFINE_MUTEX(acpi_hp_context_lock
);
45 * The UART device described by the SPCR table is the only object which needs
46 * special-casing. Everything else is covered by ACPI namespace paths in STAO
49 static u64 spcr_uart_addr
;
51 struct acpi_dep_data
{
52 struct list_head node
;
57 void acpi_scan_lock_acquire(void)
59 mutex_lock(&acpi_scan_lock
);
61 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire
);
63 void acpi_scan_lock_release(void)
65 mutex_unlock(&acpi_scan_lock
);
67 EXPORT_SYMBOL_GPL(acpi_scan_lock_release
);
69 void acpi_lock_hp_context(void)
71 mutex_lock(&acpi_hp_context_lock
);
74 void acpi_unlock_hp_context(void)
76 mutex_unlock(&acpi_hp_context_lock
);
79 void acpi_initialize_hp_context(struct acpi_device
*adev
,
80 struct acpi_hotplug_context
*hp
,
81 int (*notify
)(struct acpi_device
*, u32
),
82 void (*uevent
)(struct acpi_device
*, u32
))
84 acpi_lock_hp_context();
87 acpi_set_hp_context(adev
, hp
);
88 acpi_unlock_hp_context();
90 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context
);
92 int acpi_scan_add_handler(struct acpi_scan_handler
*handler
)
97 list_add_tail(&handler
->list_node
, &acpi_scan_handlers_list
);
101 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler
*handler
,
102 const char *hotplug_profile_name
)
106 error
= acpi_scan_add_handler(handler
);
110 acpi_sysfs_add_hotplug_profile(&handler
->hotplug
, hotplug_profile_name
);
114 bool acpi_scan_is_offline(struct acpi_device
*adev
, bool uevent
)
116 struct acpi_device_physical_node
*pn
;
120 * acpi_container_offline() calls this for all of the container's
121 * children under the container's physical_node_lock lock.
123 mutex_lock_nested(&adev
->physical_node_lock
, SINGLE_DEPTH_NESTING
);
125 list_for_each_entry(pn
, &adev
->physical_node_list
, node
)
126 if (device_supports_offline(pn
->dev
) && !pn
->dev
->offline
) {
128 kobject_uevent(&pn
->dev
->kobj
, KOBJ_CHANGE
);
134 mutex_unlock(&adev
->physical_node_lock
);
138 static acpi_status
acpi_bus_offline(acpi_handle handle
, u32 lvl
, void *data
,
141 struct acpi_device
*device
= NULL
;
142 struct acpi_device_physical_node
*pn
;
143 bool second_pass
= (bool)data
;
144 acpi_status status
= AE_OK
;
146 if (acpi_bus_get_device(handle
, &device
))
149 if (device
->handler
&& !device
->handler
->hotplug
.enabled
) {
150 *ret_p
= &device
->dev
;
154 mutex_lock(&device
->physical_node_lock
);
156 list_for_each_entry(pn
, &device
->physical_node_list
, node
) {
160 /* Skip devices offlined by the first pass. */
164 pn
->put_online
= false;
166 ret
= device_offline(pn
->dev
);
168 pn
->put_online
= !ret
;
178 mutex_unlock(&device
->physical_node_lock
);
183 static acpi_status
acpi_bus_online(acpi_handle handle
, u32 lvl
, void *data
,
186 struct acpi_device
*device
= NULL
;
187 struct acpi_device_physical_node
*pn
;
189 if (acpi_bus_get_device(handle
, &device
))
192 mutex_lock(&device
->physical_node_lock
);
194 list_for_each_entry(pn
, &device
->physical_node_list
, node
)
195 if (pn
->put_online
) {
196 device_online(pn
->dev
);
197 pn
->put_online
= false;
200 mutex_unlock(&device
->physical_node_lock
);
205 static int acpi_scan_try_to_offline(struct acpi_device
*device
)
207 acpi_handle handle
= device
->handle
;
208 struct device
*errdev
= NULL
;
212 * Carry out two passes here and ignore errors in the first pass,
213 * because if the devices in question are memory blocks and
214 * CONFIG_MEMCG is set, one of the blocks may hold data structures
215 * that the other blocks depend on, but it is not known in advance which
218 * If the first pass is successful, the second one isn't needed, though.
220 status
= acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
221 NULL
, acpi_bus_offline
, (void *)false,
223 if (status
== AE_SUPPORT
) {
224 dev_warn(errdev
, "Offline disabled.\n");
225 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
226 acpi_bus_online
, NULL
, NULL
, NULL
);
229 acpi_bus_offline(handle
, 0, (void *)false, (void **)&errdev
);
232 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
233 NULL
, acpi_bus_offline
, (void *)true,
236 acpi_bus_offline(handle
, 0, (void *)true,
240 dev_warn(errdev
, "Offline failed.\n");
241 acpi_bus_online(handle
, 0, NULL
, NULL
);
242 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
,
243 ACPI_UINT32_MAX
, acpi_bus_online
,
251 static int acpi_scan_hot_remove(struct acpi_device
*device
)
253 acpi_handle handle
= device
->handle
;
254 unsigned long long sta
;
257 if (device
->handler
&& device
->handler
->hotplug
.demand_offline
) {
258 if (!acpi_scan_is_offline(device
, true))
261 int error
= acpi_scan_try_to_offline(device
);
266 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
267 "Hot-removing device %s...\n", dev_name(&device
->dev
)));
269 acpi_bus_trim(device
);
271 acpi_evaluate_lck(handle
, 0);
275 status
= acpi_evaluate_ej0(handle
);
276 if (status
== AE_NOT_FOUND
)
278 else if (ACPI_FAILURE(status
))
282 * Verify if eject was indeed successful. If not, log an error
283 * message. No need to call _OST since _EJ0 call was made OK.
285 status
= acpi_evaluate_integer(handle
, "_STA", NULL
, &sta
);
286 if (ACPI_FAILURE(status
)) {
287 acpi_handle_warn(handle
,
288 "Status check after eject failed (0x%x)\n", status
);
289 } else if (sta
& ACPI_STA_DEVICE_ENABLED
) {
290 acpi_handle_warn(handle
,
291 "Eject incomplete - status 0x%llx\n", sta
);
297 static int acpi_scan_device_not_present(struct acpi_device
*adev
)
299 if (!acpi_device_enumerated(adev
)) {
300 dev_warn(&adev
->dev
, "Still not present\n");
307 static int acpi_scan_device_check(struct acpi_device
*adev
)
311 acpi_bus_get_status(adev
);
312 if (adev
->status
.present
|| adev
->status
.functional
) {
314 * This function is only called for device objects for which
315 * matching scan handlers exist. The only situation in which
316 * the scan handler is not attached to this device object yet
317 * is when the device has just appeared (either it wasn't
318 * present at all before or it was removed and then added
322 dev_warn(&adev
->dev
, "Already enumerated\n");
325 error
= acpi_bus_scan(adev
->handle
);
327 dev_warn(&adev
->dev
, "Namespace scan failure\n");
330 if (!adev
->handler
) {
331 dev_warn(&adev
->dev
, "Enumeration failure\n");
335 error
= acpi_scan_device_not_present(adev
);
340 static int acpi_scan_bus_check(struct acpi_device
*adev
)
342 struct acpi_scan_handler
*handler
= adev
->handler
;
343 struct acpi_device
*child
;
346 acpi_bus_get_status(adev
);
347 if (!(adev
->status
.present
|| adev
->status
.functional
)) {
348 acpi_scan_device_not_present(adev
);
351 if (handler
&& handler
->hotplug
.scan_dependent
)
352 return handler
->hotplug
.scan_dependent(adev
);
354 error
= acpi_bus_scan(adev
->handle
);
356 dev_warn(&adev
->dev
, "Namespace scan failure\n");
359 list_for_each_entry(child
, &adev
->children
, node
) {
360 error
= acpi_scan_bus_check(child
);
367 static int acpi_generic_hotplug_event(struct acpi_device
*adev
, u32 type
)
370 case ACPI_NOTIFY_BUS_CHECK
:
371 return acpi_scan_bus_check(adev
);
372 case ACPI_NOTIFY_DEVICE_CHECK
:
373 return acpi_scan_device_check(adev
);
374 case ACPI_NOTIFY_EJECT_REQUEST
:
375 case ACPI_OST_EC_OSPM_EJECT
:
376 if (adev
->handler
&& !adev
->handler
->hotplug
.enabled
) {
377 dev_info(&adev
->dev
, "Eject disabled\n");
380 acpi_evaluate_ost(adev
->handle
, ACPI_NOTIFY_EJECT_REQUEST
,
381 ACPI_OST_SC_EJECT_IN_PROGRESS
, NULL
);
382 return acpi_scan_hot_remove(adev
);
387 void acpi_device_hotplug(struct acpi_device
*adev
, u32 src
)
389 u32 ost_code
= ACPI_OST_SC_NON_SPECIFIC_FAILURE
;
392 lock_device_hotplug();
393 mutex_lock(&acpi_scan_lock
);
396 * The device object's ACPI handle cannot become invalid as long as we
397 * are holding acpi_scan_lock, but it might have become invalid before
398 * that lock was acquired.
400 if (adev
->handle
== INVALID_ACPI_HANDLE
)
403 if (adev
->flags
.is_dock_station
) {
404 error
= dock_notify(adev
, src
);
405 } else if (adev
->flags
.hotplug_notify
) {
406 error
= acpi_generic_hotplug_event(adev
, src
);
407 if (error
== -EPERM
) {
408 ost_code
= ACPI_OST_SC_EJECT_NOT_SUPPORTED
;
412 int (*notify
)(struct acpi_device
*, u32
);
414 acpi_lock_hp_context();
415 notify
= adev
->hp
? adev
->hp
->notify
: NULL
;
416 acpi_unlock_hp_context();
418 * There may be additional notify handlers for device objects
419 * without the .event() callback, so ignore them here.
422 error
= notify(adev
, src
);
427 ost_code
= ACPI_OST_SC_SUCCESS
;
430 acpi_evaluate_ost(adev
->handle
, src
, ost_code
, NULL
);
433 acpi_bus_put_acpi_device(adev
);
434 mutex_unlock(&acpi_scan_lock
);
435 unlock_device_hotplug();
438 static void acpi_free_power_resources_lists(struct acpi_device
*device
)
442 if (device
->wakeup
.flags
.valid
)
443 acpi_power_resources_list_free(&device
->wakeup
.resources
);
445 if (!device
->power
.flags
.power_resources
)
448 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3_HOT
; i
++) {
449 struct acpi_device_power_state
*ps
= &device
->power
.states
[i
];
450 acpi_power_resources_list_free(&ps
->resources
);
454 static void acpi_device_release(struct device
*dev
)
456 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
458 acpi_free_properties(acpi_dev
);
459 acpi_free_pnp_ids(&acpi_dev
->pnp
);
460 acpi_free_power_resources_lists(acpi_dev
);
464 static void acpi_device_del(struct acpi_device
*device
)
466 struct acpi_device_bus_id
*acpi_device_bus_id
;
468 mutex_lock(&acpi_device_lock
);
470 list_del(&device
->node
);
472 list_for_each_entry(acpi_device_bus_id
, &acpi_bus_id_list
, node
)
473 if (!strcmp(acpi_device_bus_id
->bus_id
,
474 acpi_device_hid(device
))) {
475 if (acpi_device_bus_id
->instance_no
> 0)
476 acpi_device_bus_id
->instance_no
--;
478 list_del(&acpi_device_bus_id
->node
);
479 kfree(acpi_device_bus_id
);
484 list_del(&device
->wakeup_list
);
485 mutex_unlock(&acpi_device_lock
);
487 acpi_power_add_remove_device(device
, false);
488 acpi_device_remove_files(device
);
490 device
->remove(device
);
492 device_del(&device
->dev
);
495 static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain
);
497 static LIST_HEAD(acpi_device_del_list
);
498 static DEFINE_MUTEX(acpi_device_del_lock
);
500 static void acpi_device_del_work_fn(struct work_struct
*work_not_used
)
503 struct acpi_device
*adev
;
505 mutex_lock(&acpi_device_del_lock
);
507 if (list_empty(&acpi_device_del_list
)) {
508 mutex_unlock(&acpi_device_del_lock
);
511 adev
= list_first_entry(&acpi_device_del_list
,
512 struct acpi_device
, del_list
);
513 list_del(&adev
->del_list
);
515 mutex_unlock(&acpi_device_del_lock
);
517 blocking_notifier_call_chain(&acpi_reconfig_chain
,
518 ACPI_RECONFIG_DEVICE_REMOVE
, adev
);
520 acpi_device_del(adev
);
522 * Drop references to all power resources that might have been
523 * used by the device.
525 acpi_power_transition(adev
, ACPI_STATE_D3_COLD
);
526 put_device(&adev
->dev
);
531 * acpi_scan_drop_device - Drop an ACPI device object.
532 * @handle: Handle of an ACPI namespace node, not used.
533 * @context: Address of the ACPI device object to drop.
535 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
536 * namespace node the device object pointed to by @context is attached to.
538 * The unregistration is carried out asynchronously to avoid running
539 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
540 * ensure the correct ordering (the device objects must be unregistered in the
541 * same order in which the corresponding namespace nodes are deleted).
543 static void acpi_scan_drop_device(acpi_handle handle
, void *context
)
545 static DECLARE_WORK(work
, acpi_device_del_work_fn
);
546 struct acpi_device
*adev
= context
;
548 mutex_lock(&acpi_device_del_lock
);
551 * Use the ACPI hotplug workqueue which is ordered, so this work item
552 * won't run after any hotplug work items submitted subsequently. That
553 * prevents attempts to register device objects identical to those being
554 * deleted from happening concurrently (such attempts result from
555 * hotplug events handled via the ACPI hotplug workqueue). It also will
556 * run after all of the work items submitted previosuly, which helps
557 * those work items to ensure that they are not accessing stale device
560 if (list_empty(&acpi_device_del_list
))
561 acpi_queue_hotplug_work(&work
);
563 list_add_tail(&adev
->del_list
, &acpi_device_del_list
);
564 /* Make acpi_ns_validate_handle() return NULL for this handle. */
565 adev
->handle
= INVALID_ACPI_HANDLE
;
567 mutex_unlock(&acpi_device_del_lock
);
570 static int acpi_get_device_data(acpi_handle handle
, struct acpi_device
**device
,
571 void (*callback
)(void *))
578 status
= acpi_get_data_full(handle
, acpi_scan_drop_device
,
579 (void **)device
, callback
);
580 if (ACPI_FAILURE(status
) || !*device
) {
581 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "No context for object [%p]\n",
588 int acpi_bus_get_device(acpi_handle handle
, struct acpi_device
**device
)
590 return acpi_get_device_data(handle
, device
, NULL
);
592 EXPORT_SYMBOL(acpi_bus_get_device
);
594 static void get_acpi_device(void *dev
)
597 get_device(&((struct acpi_device
*)dev
)->dev
);
600 struct acpi_device
*acpi_bus_get_acpi_device(acpi_handle handle
)
602 struct acpi_device
*adev
= NULL
;
604 acpi_get_device_data(handle
, &adev
, get_acpi_device
);
608 void acpi_bus_put_acpi_device(struct acpi_device
*adev
)
610 put_device(&adev
->dev
);
613 int acpi_device_add(struct acpi_device
*device
,
614 void (*release
)(struct device
*))
617 struct acpi_device_bus_id
*acpi_device_bus_id
, *new_bus_id
;
620 if (device
->handle
) {
623 status
= acpi_attach_data(device
->handle
, acpi_scan_drop_device
,
625 if (ACPI_FAILURE(status
)) {
626 acpi_handle_err(device
->handle
,
627 "Unable to attach device data\n");
635 * Link this device to its parent and siblings.
637 INIT_LIST_HEAD(&device
->children
);
638 INIT_LIST_HEAD(&device
->node
);
639 INIT_LIST_HEAD(&device
->wakeup_list
);
640 INIT_LIST_HEAD(&device
->physical_node_list
);
641 INIT_LIST_HEAD(&device
->del_list
);
642 mutex_init(&device
->physical_node_lock
);
644 new_bus_id
= kzalloc(sizeof(struct acpi_device_bus_id
), GFP_KERNEL
);
646 pr_err(PREFIX
"Memory allocation error\n");
651 mutex_lock(&acpi_device_lock
);
653 * Find suitable bus_id and instance number in acpi_bus_id_list
654 * If failed, create one and link it into acpi_bus_id_list
656 list_for_each_entry(acpi_device_bus_id
, &acpi_bus_id_list
, node
) {
657 if (!strcmp(acpi_device_bus_id
->bus_id
,
658 acpi_device_hid(device
))) {
659 acpi_device_bus_id
->instance_no
++;
666 acpi_device_bus_id
= new_bus_id
;
667 strcpy(acpi_device_bus_id
->bus_id
, acpi_device_hid(device
));
668 acpi_device_bus_id
->instance_no
= 0;
669 list_add_tail(&acpi_device_bus_id
->node
, &acpi_bus_id_list
);
671 dev_set_name(&device
->dev
, "%s:%02x", acpi_device_bus_id
->bus_id
, acpi_device_bus_id
->instance_no
);
674 list_add_tail(&device
->node
, &device
->parent
->children
);
676 if (device
->wakeup
.flags
.valid
)
677 list_add_tail(&device
->wakeup_list
, &acpi_wakeup_device_list
);
678 mutex_unlock(&acpi_device_lock
);
681 device
->dev
.parent
= &device
->parent
->dev
;
682 device
->dev
.bus
= &acpi_bus_type
;
683 device
->dev
.release
= release
;
684 result
= device_add(&device
->dev
);
686 dev_err(&device
->dev
, "Error registering device\n");
690 result
= acpi_device_setup_files(device
);
692 printk(KERN_ERR PREFIX
"Error creating sysfs interface for device %s\n",
693 dev_name(&device
->dev
));
698 mutex_lock(&acpi_device_lock
);
700 list_del(&device
->node
);
701 list_del(&device
->wakeup_list
);
702 mutex_unlock(&acpi_device_lock
);
705 acpi_detach_data(device
->handle
, acpi_scan_drop_device
);
709 /* --------------------------------------------------------------------------
711 -------------------------------------------------------------------------- */
712 static struct acpi_device
*acpi_bus_get_parent(acpi_handle handle
)
714 struct acpi_device
*device
= NULL
;
718 * Fixed hardware devices do not appear in the namespace and do not
719 * have handles, but we fabricate acpi_devices for them, so we have
720 * to deal with them specially.
726 status
= acpi_get_parent(handle
, &handle
);
727 if (ACPI_FAILURE(status
))
728 return status
== AE_NULL_ENTRY
? NULL
: acpi_root
;
729 } while (acpi_bus_get_device(handle
, &device
));
734 acpi_bus_get_ejd(acpi_handle handle
, acpi_handle
*ejd
)
738 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
739 union acpi_object
*obj
;
741 status
= acpi_get_handle(handle
, "_EJD", &tmp
);
742 if (ACPI_FAILURE(status
))
745 status
= acpi_evaluate_object(handle
, "_EJD", NULL
, &buffer
);
746 if (ACPI_SUCCESS(status
)) {
747 obj
= buffer
.pointer
;
748 status
= acpi_get_handle(ACPI_ROOT_OBJECT
, obj
->string
.pointer
,
750 kfree(buffer
.pointer
);
754 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd
);
756 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle
,
757 struct acpi_device_wakeup
*wakeup
)
759 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
760 union acpi_object
*package
= NULL
;
761 union acpi_object
*element
= NULL
;
768 INIT_LIST_HEAD(&wakeup
->resources
);
771 status
= acpi_evaluate_object(handle
, "_PRW", NULL
, &buffer
);
772 if (ACPI_FAILURE(status
)) {
773 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRW"));
777 package
= (union acpi_object
*)buffer
.pointer
;
779 if (!package
|| package
->package
.count
< 2)
782 element
= &(package
->package
.elements
[0]);
786 if (element
->type
== ACPI_TYPE_PACKAGE
) {
787 if ((element
->package
.count
< 2) ||
788 (element
->package
.elements
[0].type
!=
789 ACPI_TYPE_LOCAL_REFERENCE
)
790 || (element
->package
.elements
[1].type
!= ACPI_TYPE_INTEGER
))
794 element
->package
.elements
[0].reference
.handle
;
796 (u32
) element
->package
.elements
[1].integer
.value
;
797 } else if (element
->type
== ACPI_TYPE_INTEGER
) {
798 wakeup
->gpe_device
= NULL
;
799 wakeup
->gpe_number
= element
->integer
.value
;
804 element
= &(package
->package
.elements
[1]);
805 if (element
->type
!= ACPI_TYPE_INTEGER
)
808 wakeup
->sleep_state
= element
->integer
.value
;
810 err
= acpi_extract_power_resources(package
, 2, &wakeup
->resources
);
814 if (!list_empty(&wakeup
->resources
)) {
817 err
= acpi_power_wakeup_list_init(&wakeup
->resources
,
820 acpi_handle_warn(handle
, "Retrieving current states "
821 "of wakeup power resources failed\n");
822 acpi_power_resources_list_free(&wakeup
->resources
);
825 if (sleep_state
< wakeup
->sleep_state
) {
826 acpi_handle_warn(handle
, "Overriding _PRW sleep state "
827 "(S%d) by S%d from power resources\n",
828 (int)wakeup
->sleep_state
, sleep_state
);
829 wakeup
->sleep_state
= sleep_state
;
834 kfree(buffer
.pointer
);
838 static void acpi_wakeup_gpe_init(struct acpi_device
*device
)
840 static const struct acpi_device_id button_device_ids
[] = {
846 struct acpi_device_wakeup
*wakeup
= &device
->wakeup
;
848 acpi_event_status event_status
;
850 wakeup
->flags
.notifier_present
= 0;
852 /* Power button, Lid switch always enable wakeup */
853 if (!acpi_match_device_ids(device
, button_device_ids
)) {
854 wakeup
->flags
.run_wake
= 1;
855 if (!acpi_match_device_ids(device
, &button_device_ids
[1])) {
856 /* Do not use Lid/sleep button for S5 wakeup */
857 if (wakeup
->sleep_state
== ACPI_STATE_S5
)
858 wakeup
->sleep_state
= ACPI_STATE_S4
;
860 acpi_mark_gpe_for_wake(wakeup
->gpe_device
, wakeup
->gpe_number
);
861 device_set_wakeup_capable(&device
->dev
, true);
865 acpi_setup_gpe_for_wake(device
->handle
, wakeup
->gpe_device
,
867 status
= acpi_get_gpe_status(wakeup
->gpe_device
, wakeup
->gpe_number
,
869 if (ACPI_FAILURE(status
))
872 wakeup
->flags
.run_wake
= !!(event_status
& ACPI_EVENT_FLAG_HAS_HANDLER
);
875 static void acpi_bus_get_wakeup_device_flags(struct acpi_device
*device
)
879 /* Presence of _PRW indicates wake capable */
880 if (!acpi_has_method(device
->handle
, "_PRW"))
883 err
= acpi_bus_extract_wakeup_device_power_package(device
->handle
,
886 dev_err(&device
->dev
, "_PRW evaluation error: %d\n", err
);
890 device
->wakeup
.flags
.valid
= 1;
891 device
->wakeup
.prepare_count
= 0;
892 acpi_wakeup_gpe_init(device
);
893 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
894 * system for the ACPI device with the _PRW object.
895 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
896 * So it is necessary to call _DSW object first. Only when it is not
897 * present will the _PSW object used.
899 err
= acpi_device_sleep_wake(device
, 0, 0, 0);
901 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
902 "error in _DSW or _PSW evaluation\n"));
905 static void acpi_bus_init_power_state(struct acpi_device
*device
, int state
)
907 struct acpi_device_power_state
*ps
= &device
->power
.states
[state
];
908 char pathname
[5] = { '_', 'P', 'R', '0' + state
, '\0' };
909 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
912 INIT_LIST_HEAD(&ps
->resources
);
914 /* Evaluate "_PRx" to get referenced power resources */
915 status
= acpi_evaluate_object(device
->handle
, pathname
, NULL
, &buffer
);
916 if (ACPI_SUCCESS(status
)) {
917 union acpi_object
*package
= buffer
.pointer
;
919 if (buffer
.length
&& package
920 && package
->type
== ACPI_TYPE_PACKAGE
921 && package
->package
.count
) {
922 int err
= acpi_extract_power_resources(package
, 0,
925 device
->power
.flags
.power_resources
= 1;
927 ACPI_FREE(buffer
.pointer
);
930 /* Evaluate "_PSx" to see if we can do explicit sets */
932 if (acpi_has_method(device
->handle
, pathname
))
933 ps
->flags
.explicit_set
= 1;
935 /* State is valid if there are means to put the device into it. */
936 if (!list_empty(&ps
->resources
) || ps
->flags
.explicit_set
)
939 ps
->power
= -1; /* Unknown - driver assigned */
940 ps
->latency
= -1; /* Unknown - driver assigned */
943 static void acpi_bus_get_power_flags(struct acpi_device
*device
)
947 /* Presence of _PS0|_PR0 indicates 'power manageable' */
948 if (!acpi_has_method(device
->handle
, "_PS0") &&
949 !acpi_has_method(device
->handle
, "_PR0"))
952 device
->flags
.power_manageable
= 1;
955 * Power Management Flags
957 if (acpi_has_method(device
->handle
, "_PSC"))
958 device
->power
.flags
.explicit_get
= 1;
960 if (acpi_has_method(device
->handle
, "_IRC"))
961 device
->power
.flags
.inrush_current
= 1;
963 if (acpi_has_method(device
->handle
, "_DSW"))
964 device
->power
.flags
.dsw_present
= 1;
967 * Enumerate supported power management states
969 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3_HOT
; i
++)
970 acpi_bus_init_power_state(device
, i
);
972 INIT_LIST_HEAD(&device
->power
.states
[ACPI_STATE_D3_COLD
].resources
);
973 if (!list_empty(&device
->power
.states
[ACPI_STATE_D3_HOT
].resources
))
974 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.valid
= 1;
976 /* Set defaults for D0 and D3hot states (always valid) */
977 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
= 1;
978 device
->power
.states
[ACPI_STATE_D0
].power
= 100;
979 device
->power
.states
[ACPI_STATE_D3_HOT
].flags
.valid
= 1;
981 if (acpi_bus_init_power(device
))
982 device
->flags
.power_manageable
= 0;
985 static void acpi_bus_get_flags(struct acpi_device
*device
)
987 /* Presence of _STA indicates 'dynamic_status' */
988 if (acpi_has_method(device
->handle
, "_STA"))
989 device
->flags
.dynamic_status
= 1;
991 /* Presence of _RMV indicates 'removable' */
992 if (acpi_has_method(device
->handle
, "_RMV"))
993 device
->flags
.removable
= 1;
995 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
996 if (acpi_has_method(device
->handle
, "_EJD") ||
997 acpi_has_method(device
->handle
, "_EJ0"))
998 device
->flags
.ejectable
= 1;
1001 static void acpi_device_get_busid(struct acpi_device
*device
)
1003 char bus_id
[5] = { '?', 0 };
1004 struct acpi_buffer buffer
= { sizeof(bus_id
), bus_id
};
1010 * The device's Bus ID is simply the object name.
1011 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1013 if (ACPI_IS_ROOT_DEVICE(device
)) {
1014 strcpy(device
->pnp
.bus_id
, "ACPI");
1018 switch (device
->device_type
) {
1019 case ACPI_BUS_TYPE_POWER_BUTTON
:
1020 strcpy(device
->pnp
.bus_id
, "PWRF");
1022 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1023 strcpy(device
->pnp
.bus_id
, "SLPF");
1026 acpi_get_name(device
->handle
, ACPI_SINGLE_NAME
, &buffer
);
1027 /* Clean up trailing underscores (if any) */
1028 for (i
= 3; i
> 1; i
--) {
1029 if (bus_id
[i
] == '_')
1034 strcpy(device
->pnp
.bus_id
, bus_id
);
1040 * acpi_ata_match - see if an acpi object is an ATA device
1042 * If an acpi object has one of the ACPI ATA methods defined,
1043 * then we can safely call it an ATA device.
1045 bool acpi_ata_match(acpi_handle handle
)
1047 return acpi_has_method(handle
, "_GTF") ||
1048 acpi_has_method(handle
, "_GTM") ||
1049 acpi_has_method(handle
, "_STM") ||
1050 acpi_has_method(handle
, "_SDD");
1054 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1056 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1057 * then we can safely call it an ejectable drive bay
1059 bool acpi_bay_match(acpi_handle handle
)
1061 acpi_handle phandle
;
1063 if (!acpi_has_method(handle
, "_EJ0"))
1065 if (acpi_ata_match(handle
))
1067 if (ACPI_FAILURE(acpi_get_parent(handle
, &phandle
)))
1070 return acpi_ata_match(phandle
);
1073 bool acpi_device_is_battery(struct acpi_device
*adev
)
1075 struct acpi_hardware_id
*hwid
;
1077 list_for_each_entry(hwid
, &adev
->pnp
.ids
, list
)
1078 if (!strcmp("PNP0C0A", hwid
->id
))
1084 static bool is_ejectable_bay(struct acpi_device
*adev
)
1086 acpi_handle handle
= adev
->handle
;
1088 if (acpi_has_method(handle
, "_EJ0") && acpi_device_is_battery(adev
))
1091 return acpi_bay_match(handle
);
1095 * acpi_dock_match - see if an acpi object has a _DCK method
1097 bool acpi_dock_match(acpi_handle handle
)
1099 return acpi_has_method(handle
, "_DCK");
1103 acpi_backlight_cap_match(acpi_handle handle
, u32 level
, void *context
,
1104 void **return_value
)
1106 long *cap
= context
;
1108 if (acpi_has_method(handle
, "_BCM") &&
1109 acpi_has_method(handle
, "_BCL")) {
1110 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found generic backlight "
1112 *cap
|= ACPI_VIDEO_BACKLIGHT
;
1113 /* We have backlight support, no need to scan further */
1114 return AE_CTRL_TERMINATE
;
1119 /* Returns true if the ACPI object is a video device which can be
1120 * handled by video.ko.
1121 * The device will get a Linux specific CID added in scan.c to
1122 * identify the device as an ACPI graphics device
1123 * Be aware that the graphics device may not be physically present
1124 * Use acpi_video_get_capabilities() to detect general ACPI video
1125 * capabilities of present cards
1127 long acpi_is_video_device(acpi_handle handle
)
1129 long video_caps
= 0;
1131 /* Is this device able to support video switching ? */
1132 if (acpi_has_method(handle
, "_DOD") || acpi_has_method(handle
, "_DOS"))
1133 video_caps
|= ACPI_VIDEO_OUTPUT_SWITCHING
;
1135 /* Is this device able to retrieve a video ROM ? */
1136 if (acpi_has_method(handle
, "_ROM"))
1137 video_caps
|= ACPI_VIDEO_ROM_AVAILABLE
;
1139 /* Is this device able to configure which video head to be POSTed ? */
1140 if (acpi_has_method(handle
, "_VPO") &&
1141 acpi_has_method(handle
, "_GPD") &&
1142 acpi_has_method(handle
, "_SPD"))
1143 video_caps
|= ACPI_VIDEO_DEVICE_POSTING
;
1145 /* Only check for backlight functionality if one of the above hit. */
1147 acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
,
1148 ACPI_UINT32_MAX
, acpi_backlight_cap_match
, NULL
,
1153 EXPORT_SYMBOL(acpi_is_video_device
);
1155 const char *acpi_device_hid(struct acpi_device
*device
)
1157 struct acpi_hardware_id
*hid
;
1159 if (list_empty(&device
->pnp
.ids
))
1162 hid
= list_first_entry(&device
->pnp
.ids
, struct acpi_hardware_id
, list
);
1165 EXPORT_SYMBOL(acpi_device_hid
);
1167 static void acpi_add_id(struct acpi_device_pnp
*pnp
, const char *dev_id
)
1169 struct acpi_hardware_id
*id
;
1171 id
= kmalloc(sizeof(*id
), GFP_KERNEL
);
1175 id
->id
= kstrdup_const(dev_id
, GFP_KERNEL
);
1181 list_add_tail(&id
->list
, &pnp
->ids
);
1182 pnp
->type
.hardware_id
= 1;
1186 * Old IBM workstations have a DSDT bug wherein the SMBus object
1187 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1188 * prefix. Work around this.
1190 static bool acpi_ibm_smbus_match(acpi_handle handle
)
1192 char node_name
[ACPI_PATH_SEGMENT_LENGTH
];
1193 struct acpi_buffer path
= { sizeof(node_name
), node_name
};
1195 if (!dmi_name_in_vendors("IBM"))
1198 /* Look for SMBS object */
1199 if (ACPI_FAILURE(acpi_get_name(handle
, ACPI_SINGLE_NAME
, &path
)) ||
1200 strcmp("SMBS", path
.pointer
))
1203 /* Does it have the necessary (but misnamed) methods? */
1204 if (acpi_has_method(handle
, "SBI") &&
1205 acpi_has_method(handle
, "SBR") &&
1206 acpi_has_method(handle
, "SBW"))
1212 static bool acpi_object_is_system_bus(acpi_handle handle
)
1216 if (ACPI_SUCCESS(acpi_get_handle(NULL
, "\\_SB", &tmp
)) &&
1219 if (ACPI_SUCCESS(acpi_get_handle(NULL
, "\\_TZ", &tmp
)) &&
1226 static void acpi_set_pnp_ids(acpi_handle handle
, struct acpi_device_pnp
*pnp
,
1230 struct acpi_device_info
*info
;
1231 struct acpi_pnp_device_id_list
*cid_list
;
1234 switch (device_type
) {
1235 case ACPI_BUS_TYPE_DEVICE
:
1236 if (handle
== ACPI_ROOT_OBJECT
) {
1237 acpi_add_id(pnp
, ACPI_SYSTEM_HID
);
1241 status
= acpi_get_object_info(handle
, &info
);
1242 if (ACPI_FAILURE(status
)) {
1243 pr_err(PREFIX
"%s: Error reading device info\n",
1248 if (info
->valid
& ACPI_VALID_HID
) {
1249 acpi_add_id(pnp
, info
->hardware_id
.string
);
1250 pnp
->type
.platform_id
= 1;
1252 if (info
->valid
& ACPI_VALID_CID
) {
1253 cid_list
= &info
->compatible_id_list
;
1254 for (i
= 0; i
< cid_list
->count
; i
++)
1255 acpi_add_id(pnp
, cid_list
->ids
[i
].string
);
1257 if (info
->valid
& ACPI_VALID_ADR
) {
1258 pnp
->bus_address
= info
->address
;
1259 pnp
->type
.bus_address
= 1;
1261 if (info
->valid
& ACPI_VALID_UID
)
1262 pnp
->unique_id
= kstrdup(info
->unique_id
.string
,
1264 if (info
->valid
& ACPI_VALID_CLS
)
1265 acpi_add_id(pnp
, info
->class_code
.string
);
1270 * Some devices don't reliably have _HIDs & _CIDs, so add
1271 * synthetic HIDs to make sure drivers can find them.
1273 if (acpi_is_video_device(handle
))
1274 acpi_add_id(pnp
, ACPI_VIDEO_HID
);
1275 else if (acpi_bay_match(handle
))
1276 acpi_add_id(pnp
, ACPI_BAY_HID
);
1277 else if (acpi_dock_match(handle
))
1278 acpi_add_id(pnp
, ACPI_DOCK_HID
);
1279 else if (acpi_ibm_smbus_match(handle
))
1280 acpi_add_id(pnp
, ACPI_SMBUS_IBM_HID
);
1281 else if (list_empty(&pnp
->ids
) &&
1282 acpi_object_is_system_bus(handle
)) {
1283 /* \_SB, \_TZ, LNXSYBUS */
1284 acpi_add_id(pnp
, ACPI_BUS_HID
);
1285 strcpy(pnp
->device_name
, ACPI_BUS_DEVICE_NAME
);
1286 strcpy(pnp
->device_class
, ACPI_BUS_CLASS
);
1290 case ACPI_BUS_TYPE_POWER
:
1291 acpi_add_id(pnp
, ACPI_POWER_HID
);
1293 case ACPI_BUS_TYPE_PROCESSOR
:
1294 acpi_add_id(pnp
, ACPI_PROCESSOR_OBJECT_HID
);
1296 case ACPI_BUS_TYPE_THERMAL
:
1297 acpi_add_id(pnp
, ACPI_THERMAL_HID
);
1299 case ACPI_BUS_TYPE_POWER_BUTTON
:
1300 acpi_add_id(pnp
, ACPI_BUTTON_HID_POWERF
);
1302 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1303 acpi_add_id(pnp
, ACPI_BUTTON_HID_SLEEPF
);
1308 void acpi_free_pnp_ids(struct acpi_device_pnp
*pnp
)
1310 struct acpi_hardware_id
*id
, *tmp
;
1312 list_for_each_entry_safe(id
, tmp
, &pnp
->ids
, list
) {
1313 kfree_const(id
->id
);
1316 kfree(pnp
->unique_id
);
1320 * acpi_dma_supported - Check DMA support for the specified device.
1321 * @adev: The pointer to acpi device
1323 * Return false if DMA is not supported. Otherwise, return true
1325 bool acpi_dma_supported(struct acpi_device
*adev
)
1330 if (adev
->flags
.cca_seen
)
1334 * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1335 * DMA on "Intel platforms". Presumably that includes all x86 and
1336 * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1338 if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED
))
1345 * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1346 * @adev: The pointer to acpi device
1348 * Return enum dev_dma_attr.
1350 enum dev_dma_attr
acpi_get_dma_attr(struct acpi_device
*adev
)
1352 if (!acpi_dma_supported(adev
))
1353 return DEV_DMA_NOT_SUPPORTED
;
1355 if (adev
->flags
.coherent_dma
)
1356 return DEV_DMA_COHERENT
;
1358 return DEV_DMA_NON_COHERENT
;
1362 * acpi_dma_configure - Set-up DMA configuration for the device.
1363 * @dev: The pointer to the device
1364 * @attr: device dma attributes
1366 int acpi_dma_configure(struct device
*dev
, enum dev_dma_attr attr
)
1368 const struct iommu_ops
*iommu
;
1371 iort_set_dma_mask(dev
);
1373 iommu
= iort_iommu_configure(dev
);
1375 return PTR_ERR(iommu
);
1377 size
= max(dev
->coherent_dma_mask
, dev
->coherent_dma_mask
+ 1);
1379 * Assume dma valid range starts at 0 and covers the whole
1380 * coherent_dma_mask.
1382 arch_setup_dma_ops(dev
, 0, size
, iommu
, attr
== DEV_DMA_COHERENT
);
1386 EXPORT_SYMBOL_GPL(acpi_dma_configure
);
1389 * acpi_dma_deconfigure - Tear-down DMA configuration for the device.
1390 * @dev: The pointer to the device
1392 void acpi_dma_deconfigure(struct device
*dev
)
1394 arch_teardown_dma_ops(dev
);
1396 EXPORT_SYMBOL_GPL(acpi_dma_deconfigure
);
1398 static void acpi_init_coherency(struct acpi_device
*adev
)
1400 unsigned long long cca
= 0;
1402 struct acpi_device
*parent
= adev
->parent
;
1404 if (parent
&& parent
->flags
.cca_seen
) {
1406 * From ACPI spec, OSPM will ignore _CCA if an ancestor
1409 adev
->flags
.cca_seen
= 1;
1410 cca
= parent
->flags
.coherent_dma
;
1412 status
= acpi_evaluate_integer(adev
->handle
, "_CCA",
1414 if (ACPI_SUCCESS(status
))
1415 adev
->flags
.cca_seen
= 1;
1416 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED
))
1418 * If architecture does not specify that _CCA is
1419 * required for DMA-able devices (e.g. x86),
1420 * we default to _CCA=1.
1424 acpi_handle_debug(adev
->handle
,
1425 "ACPI device is missing _CCA.\n");
1428 adev
->flags
.coherent_dma
= cca
;
1431 void acpi_init_device_object(struct acpi_device
*device
, acpi_handle handle
,
1432 int type
, unsigned long long sta
)
1434 INIT_LIST_HEAD(&device
->pnp
.ids
);
1435 device
->device_type
= type
;
1436 device
->handle
= handle
;
1437 device
->parent
= acpi_bus_get_parent(handle
);
1438 device
->fwnode
.type
= FWNODE_ACPI
;
1439 acpi_set_device_status(device
, sta
);
1440 acpi_device_get_busid(device
);
1441 acpi_set_pnp_ids(handle
, &device
->pnp
, type
);
1442 acpi_init_properties(device
);
1443 acpi_bus_get_flags(device
);
1444 device
->flags
.match_driver
= false;
1445 device
->flags
.initialized
= true;
1446 acpi_device_clear_enumerated(device
);
1447 device_initialize(&device
->dev
);
1448 dev_set_uevent_suppress(&device
->dev
, true);
1449 acpi_init_coherency(device
);
1452 void acpi_device_add_finalize(struct acpi_device
*device
)
1454 dev_set_uevent_suppress(&device
->dev
, false);
1455 kobject_uevent(&device
->dev
.kobj
, KOBJ_ADD
);
1458 static int acpi_add_single_object(struct acpi_device
**child
,
1459 acpi_handle handle
, int type
,
1460 unsigned long long sta
)
1463 struct acpi_device
*device
;
1464 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1466 device
= kzalloc(sizeof(struct acpi_device
), GFP_KERNEL
);
1468 printk(KERN_ERR PREFIX
"Memory allocation error\n");
1472 acpi_init_device_object(device
, handle
, type
, sta
);
1473 acpi_bus_get_power_flags(device
);
1474 acpi_bus_get_wakeup_device_flags(device
);
1476 result
= acpi_device_add(device
, acpi_device_release
);
1478 acpi_device_release(&device
->dev
);
1482 acpi_power_add_remove_device(device
, true);
1483 acpi_device_add_finalize(device
);
1484 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
1485 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Added %s [%s] parent %s\n",
1486 dev_name(&device
->dev
), (char *) buffer
.pointer
,
1487 device
->parent
? dev_name(&device
->parent
->dev
) : "(null)"));
1488 kfree(buffer
.pointer
);
1493 static acpi_status
acpi_get_resource_memory(struct acpi_resource
*ares
,
1496 struct resource
*res
= context
;
1498 if (acpi_dev_resource_memory(ares
, res
))
1499 return AE_CTRL_TERMINATE
;
1504 static bool acpi_device_should_be_hidden(acpi_handle handle
)
1507 struct resource res
;
1509 /* Check if it should ignore the UART device */
1510 if (!(spcr_uart_addr
&& acpi_has_method(handle
, METHOD_NAME__CRS
)))
1514 * The UART device described in SPCR table is assumed to have only one
1515 * memory resource present. So we only look for the first one here.
1517 status
= acpi_walk_resources(handle
, METHOD_NAME__CRS
,
1518 acpi_get_resource_memory
, &res
);
1519 if (ACPI_FAILURE(status
) || res
.start
!= spcr_uart_addr
)
1522 acpi_handle_info(handle
, "The UART device @%pa in SPCR table will be hidden\n",
1528 static int acpi_bus_type_and_status(acpi_handle handle
, int *type
,
1529 unsigned long long *sta
)
1532 acpi_object_type acpi_type
;
1534 status
= acpi_get_type(handle
, &acpi_type
);
1535 if (ACPI_FAILURE(status
))
1538 switch (acpi_type
) {
1539 case ACPI_TYPE_ANY
: /* for ACPI_ROOT_OBJECT */
1540 case ACPI_TYPE_DEVICE
:
1541 if (acpi_device_should_be_hidden(handle
))
1544 *type
= ACPI_BUS_TYPE_DEVICE
;
1545 status
= acpi_bus_get_status_handle(handle
, sta
);
1546 if (ACPI_FAILURE(status
))
1549 case ACPI_TYPE_PROCESSOR
:
1550 *type
= ACPI_BUS_TYPE_PROCESSOR
;
1551 status
= acpi_bus_get_status_handle(handle
, sta
);
1552 if (ACPI_FAILURE(status
))
1555 case ACPI_TYPE_THERMAL
:
1556 *type
= ACPI_BUS_TYPE_THERMAL
;
1557 *sta
= ACPI_STA_DEFAULT
;
1559 case ACPI_TYPE_POWER
:
1560 *type
= ACPI_BUS_TYPE_POWER
;
1561 *sta
= ACPI_STA_DEFAULT
;
1570 bool acpi_device_is_present(struct acpi_device
*adev
)
1572 if (adev
->status
.present
|| adev
->status
.functional
)
1575 adev
->flags
.initialized
= false;
1579 static bool acpi_scan_handler_matching(struct acpi_scan_handler
*handler
,
1581 const struct acpi_device_id
**matchid
)
1583 const struct acpi_device_id
*devid
;
1586 return handler
->match(idstr
, matchid
);
1588 for (devid
= handler
->ids
; devid
->id
[0]; devid
++)
1589 if (!strcmp((char *)devid
->id
, idstr
)) {
1599 static struct acpi_scan_handler
*acpi_scan_match_handler(const char *idstr
,
1600 const struct acpi_device_id
**matchid
)
1602 struct acpi_scan_handler
*handler
;
1604 list_for_each_entry(handler
, &acpi_scan_handlers_list
, list_node
)
1605 if (acpi_scan_handler_matching(handler
, idstr
, matchid
))
1611 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile
*hotplug
, bool val
)
1613 if (!!hotplug
->enabled
== !!val
)
1616 mutex_lock(&acpi_scan_lock
);
1618 hotplug
->enabled
= val
;
1620 mutex_unlock(&acpi_scan_lock
);
1623 static void acpi_scan_init_hotplug(struct acpi_device
*adev
)
1625 struct acpi_hardware_id
*hwid
;
1627 if (acpi_dock_match(adev
->handle
) || is_ejectable_bay(adev
)) {
1628 acpi_dock_add(adev
);
1631 list_for_each_entry(hwid
, &adev
->pnp
.ids
, list
) {
1632 struct acpi_scan_handler
*handler
;
1634 handler
= acpi_scan_match_handler(hwid
->id
, NULL
);
1636 adev
->flags
.hotplug_notify
= true;
1642 static void acpi_device_dep_initialize(struct acpi_device
*adev
)
1644 struct acpi_dep_data
*dep
;
1645 struct acpi_handle_list dep_devices
;
1649 if (!acpi_has_method(adev
->handle
, "_DEP"))
1652 status
= acpi_evaluate_reference(adev
->handle
, "_DEP", NULL
,
1654 if (ACPI_FAILURE(status
)) {
1655 dev_dbg(&adev
->dev
, "Failed to evaluate _DEP.\n");
1659 for (i
= 0; i
< dep_devices
.count
; i
++) {
1660 struct acpi_device_info
*info
;
1663 status
= acpi_get_object_info(dep_devices
.handles
[i
], &info
);
1664 if (ACPI_FAILURE(status
)) {
1665 dev_dbg(&adev
->dev
, "Error reading _DEP device info\n");
1670 * Skip the dependency of Windows System Power
1671 * Management Controller
1673 skip
= info
->valid
& ACPI_VALID_HID
&&
1674 !strcmp(info
->hardware_id
.string
, "INT3396");
1681 dep
= kzalloc(sizeof(struct acpi_dep_data
), GFP_KERNEL
);
1685 dep
->master
= dep_devices
.handles
[i
];
1686 dep
->slave
= adev
->handle
;
1689 mutex_lock(&acpi_dep_list_lock
);
1690 list_add_tail(&dep
->node
, &acpi_dep_list
);
1691 mutex_unlock(&acpi_dep_list_lock
);
1695 static acpi_status
acpi_bus_check_add(acpi_handle handle
, u32 lvl_not_used
,
1696 void *not_used
, void **return_value
)
1698 struct acpi_device
*device
= NULL
;
1700 unsigned long long sta
;
1703 acpi_bus_get_device(handle
, &device
);
1707 result
= acpi_bus_type_and_status(handle
, &type
, &sta
);
1711 if (type
== ACPI_BUS_TYPE_POWER
) {
1712 acpi_add_power_resource(handle
);
1716 acpi_add_single_object(&device
, handle
, type
, sta
);
1718 return AE_CTRL_DEPTH
;
1720 acpi_scan_init_hotplug(device
);
1721 acpi_device_dep_initialize(device
);
1725 *return_value
= device
;
1730 static int acpi_check_spi_i2c_slave(struct acpi_resource
*ares
, void *data
)
1732 bool *is_spi_i2c_slave_p
= data
;
1734 if (ares
->type
!= ACPI_RESOURCE_TYPE_SERIAL_BUS
)
1738 * devices that are connected to UART still need to be enumerated to
1741 if (ares
->data
.common_serial_bus
.type
!= ACPI_RESOURCE_SERIAL_TYPE_UART
)
1742 *is_spi_i2c_slave_p
= true;
1744 /* no need to do more checking */
1748 static void acpi_default_enumeration(struct acpi_device
*device
)
1750 struct list_head resource_list
;
1751 bool is_spi_i2c_slave
= false;
1754 * Do not enumerate SPI/I2C slaves as they will be enumerated by their
1755 * respective parents.
1757 INIT_LIST_HEAD(&resource_list
);
1758 acpi_dev_get_resources(device
, &resource_list
, acpi_check_spi_i2c_slave
,
1760 acpi_dev_free_resource_list(&resource_list
);
1761 if (!is_spi_i2c_slave
) {
1762 acpi_create_platform_device(device
, NULL
);
1763 acpi_device_set_enumerated(device
);
1765 blocking_notifier_call_chain(&acpi_reconfig_chain
,
1766 ACPI_RECONFIG_DEVICE_ADD
, device
);
1770 static const struct acpi_device_id generic_device_ids
[] = {
1771 {ACPI_DT_NAMESPACE_HID
, },
1775 static int acpi_generic_device_attach(struct acpi_device
*adev
,
1776 const struct acpi_device_id
*not_used
)
1779 * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
1780 * below can be unconditional.
1782 if (adev
->data
.of_compatible
)
1783 acpi_default_enumeration(adev
);
1788 static struct acpi_scan_handler generic_device_handler
= {
1789 .ids
= generic_device_ids
,
1790 .attach
= acpi_generic_device_attach
,
1793 static int acpi_scan_attach_handler(struct acpi_device
*device
)
1795 struct acpi_hardware_id
*hwid
;
1798 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
) {
1799 const struct acpi_device_id
*devid
;
1800 struct acpi_scan_handler
*handler
;
1802 handler
= acpi_scan_match_handler(hwid
->id
, &devid
);
1804 if (!handler
->attach
) {
1805 device
->pnp
.type
.platform_id
= 0;
1808 device
->handler
= handler
;
1809 ret
= handler
->attach(device
, devid
);
1813 device
->handler
= NULL
;
1822 static void acpi_bus_attach(struct acpi_device
*device
)
1824 struct acpi_device
*child
;
1828 if (ACPI_SUCCESS(acpi_bus_get_ejd(device
->handle
, &ejd
)))
1829 register_dock_dependent_device(device
, ejd
);
1831 acpi_bus_get_status(device
);
1832 /* Skip devices that are not present. */
1833 if (!acpi_device_is_present(device
)) {
1834 acpi_device_clear_enumerated(device
);
1835 device
->flags
.power_manageable
= 0;
1838 if (device
->handler
)
1841 if (!device
->flags
.initialized
) {
1842 device
->flags
.power_manageable
=
1843 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
;
1844 if (acpi_bus_init_power(device
))
1845 device
->flags
.power_manageable
= 0;
1847 device
->flags
.initialized
= true;
1848 } else if (device
->flags
.visited
) {
1852 ret
= acpi_scan_attach_handler(device
);
1856 device
->flags
.match_driver
= true;
1858 acpi_device_set_enumerated(device
);
1862 ret
= device_attach(&device
->dev
);
1866 if (device
->pnp
.type
.platform_id
)
1867 acpi_default_enumeration(device
);
1869 acpi_device_set_enumerated(device
);
1872 list_for_each_entry(child
, &device
->children
, node
)
1873 acpi_bus_attach(child
);
1875 if (device
->handler
&& device
->handler
->hotplug
.notify_online
)
1876 device
->handler
->hotplug
.notify_online(device
);
1879 void acpi_walk_dep_device_list(acpi_handle handle
)
1881 struct acpi_dep_data
*dep
, *tmp
;
1882 struct acpi_device
*adev
;
1884 mutex_lock(&acpi_dep_list_lock
);
1885 list_for_each_entry_safe(dep
, tmp
, &acpi_dep_list
, node
) {
1886 if (dep
->master
== handle
) {
1887 acpi_bus_get_device(dep
->slave
, &adev
);
1892 if (!adev
->dep_unmet
)
1893 acpi_bus_attach(adev
);
1894 list_del(&dep
->node
);
1898 mutex_unlock(&acpi_dep_list_lock
);
1900 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list
);
1903 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1904 * @handle: Root of the namespace scope to scan.
1906 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1909 * If no devices were found, -ENODEV is returned, but it does not mean that
1910 * there has been a real error. There just have been no suitable ACPI objects
1911 * in the table trunk from which the kernel could create a device and add an
1912 * appropriate driver.
1914 * Must be called under acpi_scan_lock.
1916 int acpi_bus_scan(acpi_handle handle
)
1918 void *device
= NULL
;
1920 if (ACPI_SUCCESS(acpi_bus_check_add(handle
, 0, NULL
, &device
)))
1921 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
1922 acpi_bus_check_add
, NULL
, NULL
, &device
);
1925 acpi_bus_attach(device
);
1930 EXPORT_SYMBOL(acpi_bus_scan
);
1933 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
1934 * @adev: Root of the ACPI namespace scope to walk.
1936 * Must be called under acpi_scan_lock.
1938 void acpi_bus_trim(struct acpi_device
*adev
)
1940 struct acpi_scan_handler
*handler
= adev
->handler
;
1941 struct acpi_device
*child
;
1943 list_for_each_entry_reverse(child
, &adev
->children
, node
)
1944 acpi_bus_trim(child
);
1946 adev
->flags
.match_driver
= false;
1948 if (handler
->detach
)
1949 handler
->detach(adev
);
1951 adev
->handler
= NULL
;
1953 device_release_driver(&adev
->dev
);
1956 * Most likely, the device is going away, so put it into D3cold before
1959 acpi_device_set_power(adev
, ACPI_STATE_D3_COLD
);
1960 adev
->flags
.initialized
= false;
1961 acpi_device_clear_enumerated(adev
);
1963 EXPORT_SYMBOL_GPL(acpi_bus_trim
);
1965 static int acpi_bus_scan_fixed(void)
1970 * Enumerate all fixed-feature devices.
1972 if (!(acpi_gbl_FADT
.flags
& ACPI_FADT_POWER_BUTTON
)) {
1973 struct acpi_device
*device
= NULL
;
1975 result
= acpi_add_single_object(&device
, NULL
,
1976 ACPI_BUS_TYPE_POWER_BUTTON
,
1981 device
->flags
.match_driver
= true;
1982 result
= device_attach(&device
->dev
);
1986 device_init_wakeup(&device
->dev
, true);
1989 if (!(acpi_gbl_FADT
.flags
& ACPI_FADT_SLEEP_BUTTON
)) {
1990 struct acpi_device
*device
= NULL
;
1992 result
= acpi_add_single_object(&device
, NULL
,
1993 ACPI_BUS_TYPE_SLEEP_BUTTON
,
1998 device
->flags
.match_driver
= true;
1999 result
= device_attach(&device
->dev
);
2002 return result
< 0 ? result
: 0;
2005 static void __init
acpi_get_spcr_uart_addr(void)
2008 struct acpi_table_spcr
*spcr_ptr
;
2010 status
= acpi_get_table(ACPI_SIG_SPCR
, 0,
2011 (struct acpi_table_header
**)&spcr_ptr
);
2012 if (ACPI_SUCCESS(status
))
2013 spcr_uart_addr
= spcr_ptr
->serial_port
.address
;
2015 printk(KERN_WARNING PREFIX
"STAO table present, but SPCR is missing\n");
2018 static bool acpi_scan_initialized
;
2020 int __init
acpi_scan_init(void)
2024 struct acpi_table_stao
*stao_ptr
;
2026 acpi_pci_root_init();
2027 acpi_pci_link_init();
2028 acpi_processor_init();
2031 acpi_cmos_rtc_init();
2032 acpi_container_init();
2033 acpi_memory_hotplug_init();
2035 acpi_int340x_thermal_init();
2037 acpi_watchdog_init();
2039 acpi_scan_add_handler(&generic_device_handler
);
2042 * If there is STAO table, check whether it needs to ignore the UART
2043 * device in SPCR table.
2045 status
= acpi_get_table(ACPI_SIG_STAO
, 0,
2046 (struct acpi_table_header
**)&stao_ptr
);
2047 if (ACPI_SUCCESS(status
)) {
2048 if (stao_ptr
->header
.length
> sizeof(struct acpi_table_stao
))
2049 printk(KERN_INFO PREFIX
"STAO Name List not yet supported.");
2051 if (stao_ptr
->ignore_uart
)
2052 acpi_get_spcr_uart_addr();
2055 mutex_lock(&acpi_scan_lock
);
2057 * Enumerate devices in the ACPI namespace.
2059 result
= acpi_bus_scan(ACPI_ROOT_OBJECT
);
2063 result
= acpi_bus_get_device(ACPI_ROOT_OBJECT
, &acpi_root
);
2067 /* Fixed feature devices do not exist on HW-reduced platform */
2068 if (!acpi_gbl_reduced_hardware
) {
2069 result
= acpi_bus_scan_fixed();
2071 acpi_detach_data(acpi_root
->handle
,
2072 acpi_scan_drop_device
);
2073 acpi_device_del(acpi_root
);
2074 put_device(&acpi_root
->dev
);
2079 acpi_gpe_apply_masked_gpes();
2080 acpi_update_all_gpes();
2081 acpi_ec_ecdt_start();
2083 acpi_scan_initialized
= true;
2086 mutex_unlock(&acpi_scan_lock
);
2090 static struct acpi_probe_entry
*ape
;
2091 static int acpi_probe_count
;
2092 static DEFINE_MUTEX(acpi_probe_mutex
);
2094 static int __init
acpi_match_madt(struct acpi_subtable_header
*header
,
2095 const unsigned long end
)
2097 if (!ape
->subtable_valid
|| ape
->subtable_valid(header
, ape
))
2098 if (!ape
->probe_subtbl(header
, end
))
2104 int __init
__acpi_probe_device_table(struct acpi_probe_entry
*ap_head
, int nr
)
2111 mutex_lock(&acpi_probe_mutex
);
2112 for (ape
= ap_head
; nr
; ape
++, nr
--) {
2113 if (ACPI_COMPARE_NAME(ACPI_SIG_MADT
, ape
->id
)) {
2114 acpi_probe_count
= 0;
2115 acpi_table_parse_madt(ape
->type
, acpi_match_madt
, 0);
2116 count
+= acpi_probe_count
;
2119 res
= acpi_table_parse(ape
->id
, ape
->probe_table
);
2124 mutex_unlock(&acpi_probe_mutex
);
2129 struct acpi_table_events_work
{
2130 struct work_struct work
;
2135 static void acpi_table_events_fn(struct work_struct
*work
)
2137 struct acpi_table_events_work
*tew
;
2139 tew
= container_of(work
, struct acpi_table_events_work
, work
);
2141 if (tew
->event
== ACPI_TABLE_EVENT_LOAD
) {
2142 acpi_scan_lock_acquire();
2143 acpi_bus_scan(ACPI_ROOT_OBJECT
);
2144 acpi_scan_lock_release();
2150 void acpi_scan_table_handler(u32 event
, void *table
, void *context
)
2152 struct acpi_table_events_work
*tew
;
2154 if (!acpi_scan_initialized
)
2157 if (event
!= ACPI_TABLE_EVENT_LOAD
)
2160 tew
= kmalloc(sizeof(*tew
), GFP_KERNEL
);
2164 INIT_WORK(&tew
->work
, acpi_table_events_fn
);
2168 schedule_work(&tew
->work
);
2171 int acpi_reconfig_notifier_register(struct notifier_block
*nb
)
2173 return blocking_notifier_chain_register(&acpi_reconfig_chain
, nb
);
2175 EXPORT_SYMBOL(acpi_reconfig_notifier_register
);
2177 int acpi_reconfig_notifier_unregister(struct notifier_block
*nb
)
2179 return blocking_notifier_chain_unregister(&acpi_reconfig_chain
, nb
);
2181 EXPORT_SYMBOL(acpi_reconfig_notifier_unregister
);