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
);
408 int (*notify
)(struct acpi_device
*, u32
);
410 acpi_lock_hp_context();
411 notify
= adev
->hp
? adev
->hp
->notify
: NULL
;
412 acpi_unlock_hp_context();
414 * There may be additional notify handlers for device objects
415 * without the .event() callback, so ignore them here.
418 error
= notify(adev
, src
);
424 ost_code
= ACPI_OST_SC_SUCCESS
;
427 ost_code
= ACPI_OST_SC_EJECT_NOT_SUPPORTED
;
430 ost_code
= ACPI_OST_SC_DEVICE_BUSY
;
433 ost_code
= ACPI_OST_SC_NON_SPECIFIC_FAILURE
;
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 struct acpi_device_bus_id
*acpi_device_bus_id
;
476 mutex_lock(&acpi_device_lock
);
478 list_del(&device
->node
);
480 list_for_each_entry(acpi_device_bus_id
, &acpi_bus_id_list
, node
)
481 if (!strcmp(acpi_device_bus_id
->bus_id
,
482 acpi_device_hid(device
))) {
483 if (acpi_device_bus_id
->instance_no
> 0)
484 acpi_device_bus_id
->instance_no
--;
486 list_del(&acpi_device_bus_id
->node
);
487 kfree(acpi_device_bus_id
);
492 list_del(&device
->wakeup_list
);
493 mutex_unlock(&acpi_device_lock
);
495 acpi_power_add_remove_device(device
, false);
496 acpi_device_remove_files(device
);
498 device
->remove(device
);
500 device_del(&device
->dev
);
503 static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain
);
505 static LIST_HEAD(acpi_device_del_list
);
506 static DEFINE_MUTEX(acpi_device_del_lock
);
508 static void acpi_device_del_work_fn(struct work_struct
*work_not_used
)
511 struct acpi_device
*adev
;
513 mutex_lock(&acpi_device_del_lock
);
515 if (list_empty(&acpi_device_del_list
)) {
516 mutex_unlock(&acpi_device_del_lock
);
519 adev
= list_first_entry(&acpi_device_del_list
,
520 struct acpi_device
, del_list
);
521 list_del(&adev
->del_list
);
523 mutex_unlock(&acpi_device_del_lock
);
525 blocking_notifier_call_chain(&acpi_reconfig_chain
,
526 ACPI_RECONFIG_DEVICE_REMOVE
, adev
);
528 acpi_device_del(adev
);
530 * Drop references to all power resources that might have been
531 * used by the device.
533 acpi_power_transition(adev
, ACPI_STATE_D3_COLD
);
534 put_device(&adev
->dev
);
539 * acpi_scan_drop_device - Drop an ACPI device object.
540 * @handle: Handle of an ACPI namespace node, not used.
541 * @context: Address of the ACPI device object to drop.
543 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
544 * namespace node the device object pointed to by @context is attached to.
546 * The unregistration is carried out asynchronously to avoid running
547 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
548 * ensure the correct ordering (the device objects must be unregistered in the
549 * same order in which the corresponding namespace nodes are deleted).
551 static void acpi_scan_drop_device(acpi_handle handle
, void *context
)
553 static DECLARE_WORK(work
, acpi_device_del_work_fn
);
554 struct acpi_device
*adev
= context
;
556 mutex_lock(&acpi_device_del_lock
);
559 * Use the ACPI hotplug workqueue which is ordered, so this work item
560 * won't run after any hotplug work items submitted subsequently. That
561 * prevents attempts to register device objects identical to those being
562 * deleted from happening concurrently (such attempts result from
563 * hotplug events handled via the ACPI hotplug workqueue). It also will
564 * run after all of the work items submitted previosuly, which helps
565 * those work items to ensure that they are not accessing stale device
568 if (list_empty(&acpi_device_del_list
))
569 acpi_queue_hotplug_work(&work
);
571 list_add_tail(&adev
->del_list
, &acpi_device_del_list
);
572 /* Make acpi_ns_validate_handle() return NULL for this handle. */
573 adev
->handle
= INVALID_ACPI_HANDLE
;
575 mutex_unlock(&acpi_device_del_lock
);
578 static int acpi_get_device_data(acpi_handle handle
, struct acpi_device
**device
,
579 void (*callback
)(void *))
586 status
= acpi_get_data_full(handle
, acpi_scan_drop_device
,
587 (void **)device
, callback
);
588 if (ACPI_FAILURE(status
) || !*device
) {
589 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "No context for object [%p]\n",
596 int acpi_bus_get_device(acpi_handle handle
, struct acpi_device
**device
)
598 return acpi_get_device_data(handle
, device
, NULL
);
600 EXPORT_SYMBOL(acpi_bus_get_device
);
602 static void get_acpi_device(void *dev
)
605 get_device(&((struct acpi_device
*)dev
)->dev
);
608 struct acpi_device
*acpi_bus_get_acpi_device(acpi_handle handle
)
610 struct acpi_device
*adev
= NULL
;
612 acpi_get_device_data(handle
, &adev
, get_acpi_device
);
616 void acpi_bus_put_acpi_device(struct acpi_device
*adev
)
618 put_device(&adev
->dev
);
621 int acpi_device_add(struct acpi_device
*device
,
622 void (*release
)(struct device
*))
625 struct acpi_device_bus_id
*acpi_device_bus_id
, *new_bus_id
;
628 if (device
->handle
) {
631 status
= acpi_attach_data(device
->handle
, acpi_scan_drop_device
,
633 if (ACPI_FAILURE(status
)) {
634 acpi_handle_err(device
->handle
,
635 "Unable to attach device data\n");
643 * Link this device to its parent and siblings.
645 INIT_LIST_HEAD(&device
->children
);
646 INIT_LIST_HEAD(&device
->node
);
647 INIT_LIST_HEAD(&device
->wakeup_list
);
648 INIT_LIST_HEAD(&device
->physical_node_list
);
649 INIT_LIST_HEAD(&device
->del_list
);
650 mutex_init(&device
->physical_node_lock
);
652 new_bus_id
= kzalloc(sizeof(struct acpi_device_bus_id
), GFP_KERNEL
);
654 pr_err(PREFIX
"Memory allocation error\n");
659 mutex_lock(&acpi_device_lock
);
661 * Find suitable bus_id and instance number in acpi_bus_id_list
662 * If failed, create one and link it into acpi_bus_id_list
664 list_for_each_entry(acpi_device_bus_id
, &acpi_bus_id_list
, node
) {
665 if (!strcmp(acpi_device_bus_id
->bus_id
,
666 acpi_device_hid(device
))) {
667 acpi_device_bus_id
->instance_no
++;
674 acpi_device_bus_id
= new_bus_id
;
675 strcpy(acpi_device_bus_id
->bus_id
, acpi_device_hid(device
));
676 acpi_device_bus_id
->instance_no
= 0;
677 list_add_tail(&acpi_device_bus_id
->node
, &acpi_bus_id_list
);
679 dev_set_name(&device
->dev
, "%s:%02x", acpi_device_bus_id
->bus_id
, acpi_device_bus_id
->instance_no
);
682 list_add_tail(&device
->node
, &device
->parent
->children
);
684 if (device
->wakeup
.flags
.valid
)
685 list_add_tail(&device
->wakeup_list
, &acpi_wakeup_device_list
);
686 mutex_unlock(&acpi_device_lock
);
689 device
->dev
.parent
= &device
->parent
->dev
;
690 device
->dev
.bus
= &acpi_bus_type
;
691 device
->dev
.release
= release
;
692 result
= device_add(&device
->dev
);
694 dev_err(&device
->dev
, "Error registering device\n");
698 result
= acpi_device_setup_files(device
);
700 printk(KERN_ERR PREFIX
"Error creating sysfs interface for device %s\n",
701 dev_name(&device
->dev
));
706 mutex_lock(&acpi_device_lock
);
708 list_del(&device
->node
);
709 list_del(&device
->wakeup_list
);
710 mutex_unlock(&acpi_device_lock
);
713 acpi_detach_data(device
->handle
, acpi_scan_drop_device
);
717 /* --------------------------------------------------------------------------
719 -------------------------------------------------------------------------- */
720 static struct acpi_device
*acpi_bus_get_parent(acpi_handle handle
)
722 struct acpi_device
*device
= NULL
;
726 * Fixed hardware devices do not appear in the namespace and do not
727 * have handles, but we fabricate acpi_devices for them, so we have
728 * to deal with them specially.
734 status
= acpi_get_parent(handle
, &handle
);
735 if (ACPI_FAILURE(status
))
736 return status
== AE_NULL_ENTRY
? NULL
: acpi_root
;
737 } while (acpi_bus_get_device(handle
, &device
));
742 acpi_bus_get_ejd(acpi_handle handle
, acpi_handle
*ejd
)
746 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
747 union acpi_object
*obj
;
749 status
= acpi_get_handle(handle
, "_EJD", &tmp
);
750 if (ACPI_FAILURE(status
))
753 status
= acpi_evaluate_object(handle
, "_EJD", NULL
, &buffer
);
754 if (ACPI_SUCCESS(status
)) {
755 obj
= buffer
.pointer
;
756 status
= acpi_get_handle(ACPI_ROOT_OBJECT
, obj
->string
.pointer
,
758 kfree(buffer
.pointer
);
762 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd
);
764 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle
,
765 struct acpi_device_wakeup
*wakeup
)
767 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
768 union acpi_object
*package
= NULL
;
769 union acpi_object
*element
= NULL
;
776 INIT_LIST_HEAD(&wakeup
->resources
);
779 status
= acpi_evaluate_object(handle
, "_PRW", NULL
, &buffer
);
780 if (ACPI_FAILURE(status
)) {
781 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRW"));
785 package
= (union acpi_object
*)buffer
.pointer
;
787 if (!package
|| package
->package
.count
< 2)
790 element
= &(package
->package
.elements
[0]);
794 if (element
->type
== ACPI_TYPE_PACKAGE
) {
795 if ((element
->package
.count
< 2) ||
796 (element
->package
.elements
[0].type
!=
797 ACPI_TYPE_LOCAL_REFERENCE
)
798 || (element
->package
.elements
[1].type
!= ACPI_TYPE_INTEGER
))
802 element
->package
.elements
[0].reference
.handle
;
804 (u32
) element
->package
.elements
[1].integer
.value
;
805 } else if (element
->type
== ACPI_TYPE_INTEGER
) {
806 wakeup
->gpe_device
= NULL
;
807 wakeup
->gpe_number
= element
->integer
.value
;
812 element
= &(package
->package
.elements
[1]);
813 if (element
->type
!= ACPI_TYPE_INTEGER
)
816 wakeup
->sleep_state
= element
->integer
.value
;
818 err
= acpi_extract_power_resources(package
, 2, &wakeup
->resources
);
822 if (!list_empty(&wakeup
->resources
)) {
825 err
= acpi_power_wakeup_list_init(&wakeup
->resources
,
828 acpi_handle_warn(handle
, "Retrieving current states "
829 "of wakeup power resources failed\n");
830 acpi_power_resources_list_free(&wakeup
->resources
);
833 if (sleep_state
< wakeup
->sleep_state
) {
834 acpi_handle_warn(handle
, "Overriding _PRW sleep state "
835 "(S%d) by S%d from power resources\n",
836 (int)wakeup
->sleep_state
, sleep_state
);
837 wakeup
->sleep_state
= sleep_state
;
842 kfree(buffer
.pointer
);
846 static bool acpi_wakeup_gpe_init(struct acpi_device
*device
)
848 static const struct acpi_device_id button_device_ids
[] = {
854 struct acpi_device_wakeup
*wakeup
= &device
->wakeup
;
857 wakeup
->flags
.notifier_present
= 0;
859 /* Power button, Lid switch always enable wakeup */
860 if (!acpi_match_device_ids(device
, button_device_ids
)) {
861 if (!acpi_match_device_ids(device
, &button_device_ids
[1])) {
862 /* Do not use Lid/sleep button for S5 wakeup */
863 if (wakeup
->sleep_state
== ACPI_STATE_S5
)
864 wakeup
->sleep_state
= ACPI_STATE_S4
;
866 acpi_mark_gpe_for_wake(wakeup
->gpe_device
, wakeup
->gpe_number
);
867 device_set_wakeup_capable(&device
->dev
, true);
871 status
= acpi_setup_gpe_for_wake(device
->handle
, wakeup
->gpe_device
,
873 return ACPI_SUCCESS(status
);
876 static void acpi_bus_get_wakeup_device_flags(struct acpi_device
*device
)
880 /* Presence of _PRW indicates wake capable */
881 if (!acpi_has_method(device
->handle
, "_PRW"))
884 err
= acpi_bus_extract_wakeup_device_power_package(device
->handle
,
887 dev_err(&device
->dev
, "_PRW evaluation error: %d\n", err
);
891 device
->wakeup
.flags
.valid
= acpi_wakeup_gpe_init(device
);
892 device
->wakeup
.prepare_count
= 0;
894 * Call _PSW/_DSW object to disable its ability to wake the sleeping
895 * system for the ACPI device with the _PRW object.
896 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
897 * So it is necessary to call _DSW object first. Only when it is not
898 * present will the _PSW object used.
900 err
= acpi_device_sleep_wake(device
, 0, 0, 0);
902 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
903 "error in _DSW or _PSW evaluation\n"));
906 static void acpi_bus_init_power_state(struct acpi_device
*device
, int state
)
908 struct acpi_device_power_state
*ps
= &device
->power
.states
[state
];
909 char pathname
[5] = { '_', 'P', 'R', '0' + state
, '\0' };
910 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
913 INIT_LIST_HEAD(&ps
->resources
);
915 /* Evaluate "_PRx" to get referenced power resources */
916 status
= acpi_evaluate_object(device
->handle
, pathname
, NULL
, &buffer
);
917 if (ACPI_SUCCESS(status
)) {
918 union acpi_object
*package
= buffer
.pointer
;
920 if (buffer
.length
&& package
921 && package
->type
== ACPI_TYPE_PACKAGE
922 && package
->package
.count
) {
923 int err
= acpi_extract_power_resources(package
, 0,
926 device
->power
.flags
.power_resources
= 1;
928 ACPI_FREE(buffer
.pointer
);
931 /* Evaluate "_PSx" to see if we can do explicit sets */
933 if (acpi_has_method(device
->handle
, pathname
))
934 ps
->flags
.explicit_set
= 1;
936 /* State is valid if there are means to put the device into it. */
937 if (!list_empty(&ps
->resources
) || ps
->flags
.explicit_set
)
940 ps
->power
= -1; /* Unknown - driver assigned */
941 ps
->latency
= -1; /* Unknown - driver assigned */
944 static void acpi_bus_get_power_flags(struct acpi_device
*device
)
948 /* Presence of _PS0|_PR0 indicates 'power manageable' */
949 if (!acpi_has_method(device
->handle
, "_PS0") &&
950 !acpi_has_method(device
->handle
, "_PR0"))
953 device
->flags
.power_manageable
= 1;
956 * Power Management Flags
958 if (acpi_has_method(device
->handle
, "_PSC"))
959 device
->power
.flags
.explicit_get
= 1;
961 if (acpi_has_method(device
->handle
, "_IRC"))
962 device
->power
.flags
.inrush_current
= 1;
964 if (acpi_has_method(device
->handle
, "_DSW"))
965 device
->power
.flags
.dsw_present
= 1;
968 * Enumerate supported power management states
970 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3_HOT
; i
++)
971 acpi_bus_init_power_state(device
, i
);
973 INIT_LIST_HEAD(&device
->power
.states
[ACPI_STATE_D3_COLD
].resources
);
974 if (!list_empty(&device
->power
.states
[ACPI_STATE_D3_HOT
].resources
))
975 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.valid
= 1;
977 /* Set defaults for D0 and D3hot states (always valid) */
978 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
= 1;
979 device
->power
.states
[ACPI_STATE_D0
].power
= 100;
980 device
->power
.states
[ACPI_STATE_D3_HOT
].flags
.valid
= 1;
982 if (acpi_bus_init_power(device
))
983 device
->flags
.power_manageable
= 0;
986 static void acpi_bus_get_flags(struct acpi_device
*device
)
988 /* Presence of _STA indicates 'dynamic_status' */
989 if (acpi_has_method(device
->handle
, "_STA"))
990 device
->flags
.dynamic_status
= 1;
992 /* Presence of _RMV indicates 'removable' */
993 if (acpi_has_method(device
->handle
, "_RMV"))
994 device
->flags
.removable
= 1;
996 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
997 if (acpi_has_method(device
->handle
, "_EJD") ||
998 acpi_has_method(device
->handle
, "_EJ0"))
999 device
->flags
.ejectable
= 1;
1002 static void acpi_device_get_busid(struct acpi_device
*device
)
1004 char bus_id
[5] = { '?', 0 };
1005 struct acpi_buffer buffer
= { sizeof(bus_id
), bus_id
};
1011 * The device's Bus ID is simply the object name.
1012 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1014 if (ACPI_IS_ROOT_DEVICE(device
)) {
1015 strcpy(device
->pnp
.bus_id
, "ACPI");
1019 switch (device
->device_type
) {
1020 case ACPI_BUS_TYPE_POWER_BUTTON
:
1021 strcpy(device
->pnp
.bus_id
, "PWRF");
1023 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1024 strcpy(device
->pnp
.bus_id
, "SLPF");
1027 acpi_get_name(device
->handle
, ACPI_SINGLE_NAME
, &buffer
);
1028 /* Clean up trailing underscores (if any) */
1029 for (i
= 3; i
> 1; i
--) {
1030 if (bus_id
[i
] == '_')
1035 strcpy(device
->pnp
.bus_id
, bus_id
);
1041 * acpi_ata_match - see if an acpi object is an ATA device
1043 * If an acpi object has one of the ACPI ATA methods defined,
1044 * then we can safely call it an ATA device.
1046 bool acpi_ata_match(acpi_handle handle
)
1048 return acpi_has_method(handle
, "_GTF") ||
1049 acpi_has_method(handle
, "_GTM") ||
1050 acpi_has_method(handle
, "_STM") ||
1051 acpi_has_method(handle
, "_SDD");
1055 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1057 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1058 * then we can safely call it an ejectable drive bay
1060 bool acpi_bay_match(acpi_handle handle
)
1062 acpi_handle phandle
;
1064 if (!acpi_has_method(handle
, "_EJ0"))
1066 if (acpi_ata_match(handle
))
1068 if (ACPI_FAILURE(acpi_get_parent(handle
, &phandle
)))
1071 return acpi_ata_match(phandle
);
1074 bool acpi_device_is_battery(struct acpi_device
*adev
)
1076 struct acpi_hardware_id
*hwid
;
1078 list_for_each_entry(hwid
, &adev
->pnp
.ids
, list
)
1079 if (!strcmp("PNP0C0A", hwid
->id
))
1085 static bool is_ejectable_bay(struct acpi_device
*adev
)
1087 acpi_handle handle
= adev
->handle
;
1089 if (acpi_has_method(handle
, "_EJ0") && acpi_device_is_battery(adev
))
1092 return acpi_bay_match(handle
);
1096 * acpi_dock_match - see if an acpi object has a _DCK method
1098 bool acpi_dock_match(acpi_handle handle
)
1100 return acpi_has_method(handle
, "_DCK");
1104 acpi_backlight_cap_match(acpi_handle handle
, u32 level
, void *context
,
1105 void **return_value
)
1107 long *cap
= context
;
1109 if (acpi_has_method(handle
, "_BCM") &&
1110 acpi_has_method(handle
, "_BCL")) {
1111 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found generic backlight "
1113 *cap
|= ACPI_VIDEO_BACKLIGHT
;
1114 /* We have backlight support, no need to scan further */
1115 return AE_CTRL_TERMINATE
;
1120 /* Returns true if the ACPI object is a video device which can be
1121 * handled by video.ko.
1122 * The device will get a Linux specific CID added in scan.c to
1123 * identify the device as an ACPI graphics device
1124 * Be aware that the graphics device may not be physically present
1125 * Use acpi_video_get_capabilities() to detect general ACPI video
1126 * capabilities of present cards
1128 long acpi_is_video_device(acpi_handle handle
)
1130 long video_caps
= 0;
1132 /* Is this device able to support video switching ? */
1133 if (acpi_has_method(handle
, "_DOD") || acpi_has_method(handle
, "_DOS"))
1134 video_caps
|= ACPI_VIDEO_OUTPUT_SWITCHING
;
1136 /* Is this device able to retrieve a video ROM ? */
1137 if (acpi_has_method(handle
, "_ROM"))
1138 video_caps
|= ACPI_VIDEO_ROM_AVAILABLE
;
1140 /* Is this device able to configure which video head to be POSTed ? */
1141 if (acpi_has_method(handle
, "_VPO") &&
1142 acpi_has_method(handle
, "_GPD") &&
1143 acpi_has_method(handle
, "_SPD"))
1144 video_caps
|= ACPI_VIDEO_DEVICE_POSTING
;
1146 /* Only check for backlight functionality if one of the above hit. */
1148 acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
,
1149 ACPI_UINT32_MAX
, acpi_backlight_cap_match
, NULL
,
1154 EXPORT_SYMBOL(acpi_is_video_device
);
1156 const char *acpi_device_hid(struct acpi_device
*device
)
1158 struct acpi_hardware_id
*hid
;
1160 if (list_empty(&device
->pnp
.ids
))
1163 hid
= list_first_entry(&device
->pnp
.ids
, struct acpi_hardware_id
, list
);
1166 EXPORT_SYMBOL(acpi_device_hid
);
1168 static void acpi_add_id(struct acpi_device_pnp
*pnp
, const char *dev_id
)
1170 struct acpi_hardware_id
*id
;
1172 id
= kmalloc(sizeof(*id
), GFP_KERNEL
);
1176 id
->id
= kstrdup_const(dev_id
, GFP_KERNEL
);
1182 list_add_tail(&id
->list
, &pnp
->ids
);
1183 pnp
->type
.hardware_id
= 1;
1187 * Old IBM workstations have a DSDT bug wherein the SMBus object
1188 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1189 * prefix. Work around this.
1191 static bool acpi_ibm_smbus_match(acpi_handle handle
)
1193 char node_name
[ACPI_PATH_SEGMENT_LENGTH
];
1194 struct acpi_buffer path
= { sizeof(node_name
), node_name
};
1196 if (!dmi_name_in_vendors("IBM"))
1199 /* Look for SMBS object */
1200 if (ACPI_FAILURE(acpi_get_name(handle
, ACPI_SINGLE_NAME
, &path
)) ||
1201 strcmp("SMBS", path
.pointer
))
1204 /* Does it have the necessary (but misnamed) methods? */
1205 if (acpi_has_method(handle
, "SBI") &&
1206 acpi_has_method(handle
, "SBR") &&
1207 acpi_has_method(handle
, "SBW"))
1213 static bool acpi_object_is_system_bus(acpi_handle handle
)
1217 if (ACPI_SUCCESS(acpi_get_handle(NULL
, "\\_SB", &tmp
)) &&
1220 if (ACPI_SUCCESS(acpi_get_handle(NULL
, "\\_TZ", &tmp
)) &&
1227 static void acpi_set_pnp_ids(acpi_handle handle
, struct acpi_device_pnp
*pnp
,
1231 struct acpi_device_info
*info
;
1232 struct acpi_pnp_device_id_list
*cid_list
;
1235 switch (device_type
) {
1236 case ACPI_BUS_TYPE_DEVICE
:
1237 if (handle
== ACPI_ROOT_OBJECT
) {
1238 acpi_add_id(pnp
, ACPI_SYSTEM_HID
);
1242 status
= acpi_get_object_info(handle
, &info
);
1243 if (ACPI_FAILURE(status
)) {
1244 pr_err(PREFIX
"%s: Error reading device info\n",
1249 if (info
->valid
& ACPI_VALID_HID
) {
1250 acpi_add_id(pnp
, info
->hardware_id
.string
);
1251 pnp
->type
.platform_id
= 1;
1253 if (info
->valid
& ACPI_VALID_CID
) {
1254 cid_list
= &info
->compatible_id_list
;
1255 for (i
= 0; i
< cid_list
->count
; i
++)
1256 acpi_add_id(pnp
, cid_list
->ids
[i
].string
);
1258 if (info
->valid
& ACPI_VALID_ADR
) {
1259 pnp
->bus_address
= info
->address
;
1260 pnp
->type
.bus_address
= 1;
1262 if (info
->valid
& ACPI_VALID_UID
)
1263 pnp
->unique_id
= kstrdup(info
->unique_id
.string
,
1265 if (info
->valid
& ACPI_VALID_CLS
)
1266 acpi_add_id(pnp
, info
->class_code
.string
);
1271 * Some devices don't reliably have _HIDs & _CIDs, so add
1272 * synthetic HIDs to make sure drivers can find them.
1274 if (acpi_is_video_device(handle
))
1275 acpi_add_id(pnp
, ACPI_VIDEO_HID
);
1276 else if (acpi_bay_match(handle
))
1277 acpi_add_id(pnp
, ACPI_BAY_HID
);
1278 else if (acpi_dock_match(handle
))
1279 acpi_add_id(pnp
, ACPI_DOCK_HID
);
1280 else if (acpi_ibm_smbus_match(handle
))
1281 acpi_add_id(pnp
, ACPI_SMBUS_IBM_HID
);
1282 else if (list_empty(&pnp
->ids
) &&
1283 acpi_object_is_system_bus(handle
)) {
1284 /* \_SB, \_TZ, LNXSYBUS */
1285 acpi_add_id(pnp
, ACPI_BUS_HID
);
1286 strcpy(pnp
->device_name
, ACPI_BUS_DEVICE_NAME
);
1287 strcpy(pnp
->device_class
, ACPI_BUS_CLASS
);
1291 case ACPI_BUS_TYPE_POWER
:
1292 acpi_add_id(pnp
, ACPI_POWER_HID
);
1294 case ACPI_BUS_TYPE_PROCESSOR
:
1295 acpi_add_id(pnp
, ACPI_PROCESSOR_OBJECT_HID
);
1297 case ACPI_BUS_TYPE_THERMAL
:
1298 acpi_add_id(pnp
, ACPI_THERMAL_HID
);
1300 case ACPI_BUS_TYPE_POWER_BUTTON
:
1301 acpi_add_id(pnp
, ACPI_BUTTON_HID_POWERF
);
1303 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1304 acpi_add_id(pnp
, ACPI_BUTTON_HID_SLEEPF
);
1309 void acpi_free_pnp_ids(struct acpi_device_pnp
*pnp
)
1311 struct acpi_hardware_id
*id
, *tmp
;
1313 list_for_each_entry_safe(id
, tmp
, &pnp
->ids
, list
) {
1314 kfree_const(id
->id
);
1317 kfree(pnp
->unique_id
);
1321 * acpi_dma_supported - Check DMA support for the specified device.
1322 * @adev: The pointer to acpi device
1324 * Return false if DMA is not supported. Otherwise, return true
1326 bool acpi_dma_supported(struct acpi_device
*adev
)
1331 if (adev
->flags
.cca_seen
)
1335 * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
1336 * DMA on "Intel platforms". Presumably that includes all x86 and
1337 * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
1339 if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED
))
1346 * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
1347 * @adev: The pointer to acpi device
1349 * Return enum dev_dma_attr.
1351 enum dev_dma_attr
acpi_get_dma_attr(struct acpi_device
*adev
)
1353 if (!acpi_dma_supported(adev
))
1354 return DEV_DMA_NOT_SUPPORTED
;
1356 if (adev
->flags
.coherent_dma
)
1357 return DEV_DMA_COHERENT
;
1359 return DEV_DMA_NON_COHERENT
;
1363 * acpi_dma_configure - Set-up DMA configuration for the device.
1364 * @dev: The pointer to the device
1365 * @attr: device dma attributes
1367 int acpi_dma_configure(struct device
*dev
, enum dev_dma_attr attr
)
1369 const struct iommu_ops
*iommu
;
1372 iort_set_dma_mask(dev
);
1374 iommu
= iort_iommu_configure(dev
);
1375 if (IS_ERR(iommu
) && PTR_ERR(iommu
) == -EPROBE_DEFER
)
1376 return -EPROBE_DEFER
;
1378 size
= max(dev
->coherent_dma_mask
, dev
->coherent_dma_mask
+ 1);
1380 * Assume dma valid range starts at 0 and covers the whole
1381 * coherent_dma_mask.
1383 arch_setup_dma_ops(dev
, 0, size
, iommu
, attr
== DEV_DMA_COHERENT
);
1387 EXPORT_SYMBOL_GPL(acpi_dma_configure
);
1390 * acpi_dma_deconfigure - Tear-down DMA configuration for the device.
1391 * @dev: The pointer to the device
1393 void acpi_dma_deconfigure(struct device
*dev
)
1395 arch_teardown_dma_ops(dev
);
1397 EXPORT_SYMBOL_GPL(acpi_dma_deconfigure
);
1399 static void acpi_init_coherency(struct acpi_device
*adev
)
1401 unsigned long long cca
= 0;
1403 struct acpi_device
*parent
= adev
->parent
;
1405 if (parent
&& parent
->flags
.cca_seen
) {
1407 * From ACPI spec, OSPM will ignore _CCA if an ancestor
1410 adev
->flags
.cca_seen
= 1;
1411 cca
= parent
->flags
.coherent_dma
;
1413 status
= acpi_evaluate_integer(adev
->handle
, "_CCA",
1415 if (ACPI_SUCCESS(status
))
1416 adev
->flags
.cca_seen
= 1;
1417 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED
))
1419 * If architecture does not specify that _CCA is
1420 * required for DMA-able devices (e.g. x86),
1421 * we default to _CCA=1.
1425 acpi_handle_debug(adev
->handle
,
1426 "ACPI device is missing _CCA.\n");
1429 adev
->flags
.coherent_dma
= cca
;
1432 static int acpi_check_spi_i2c_slave(struct acpi_resource
*ares
, void *data
)
1434 bool *is_spi_i2c_slave_p
= data
;
1436 if (ares
->type
!= ACPI_RESOURCE_TYPE_SERIAL_BUS
)
1440 * devices that are connected to UART still need to be enumerated to
1443 if (ares
->data
.common_serial_bus
.type
!= ACPI_RESOURCE_SERIAL_TYPE_UART
)
1444 *is_spi_i2c_slave_p
= true;
1446 /* no need to do more checking */
1450 static bool acpi_is_spi_i2c_slave(struct acpi_device
*device
)
1452 struct list_head resource_list
;
1453 bool is_spi_i2c_slave
= false;
1455 INIT_LIST_HEAD(&resource_list
);
1456 acpi_dev_get_resources(device
, &resource_list
, acpi_check_spi_i2c_slave
,
1458 acpi_dev_free_resource_list(&resource_list
);
1460 return is_spi_i2c_slave
;
1463 void acpi_init_device_object(struct acpi_device
*device
, acpi_handle handle
,
1464 int type
, unsigned long long sta
)
1466 INIT_LIST_HEAD(&device
->pnp
.ids
);
1467 device
->device_type
= type
;
1468 device
->handle
= handle
;
1469 device
->parent
= acpi_bus_get_parent(handle
);
1470 device
->fwnode
.type
= FWNODE_ACPI
;
1471 device
->fwnode
.ops
= &acpi_fwnode_ops
;
1472 acpi_set_device_status(device
, sta
);
1473 acpi_device_get_busid(device
);
1474 acpi_set_pnp_ids(handle
, &device
->pnp
, type
);
1475 acpi_init_properties(device
);
1476 acpi_bus_get_flags(device
);
1477 device
->flags
.match_driver
= false;
1478 device
->flags
.initialized
= true;
1479 device
->flags
.spi_i2c_slave
= acpi_is_spi_i2c_slave(device
);
1480 acpi_device_clear_enumerated(device
);
1481 device_initialize(&device
->dev
);
1482 dev_set_uevent_suppress(&device
->dev
, true);
1483 acpi_init_coherency(device
);
1486 void acpi_device_add_finalize(struct acpi_device
*device
)
1488 dev_set_uevent_suppress(&device
->dev
, false);
1489 kobject_uevent(&device
->dev
.kobj
, KOBJ_ADD
);
1492 static int acpi_add_single_object(struct acpi_device
**child
,
1493 acpi_handle handle
, int type
,
1494 unsigned long long sta
)
1497 struct acpi_device
*device
;
1498 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1500 device
= kzalloc(sizeof(struct acpi_device
), GFP_KERNEL
);
1502 printk(KERN_ERR PREFIX
"Memory allocation error\n");
1506 acpi_init_device_object(device
, handle
, type
, sta
);
1507 acpi_bus_get_power_flags(device
);
1508 acpi_bus_get_wakeup_device_flags(device
);
1510 result
= acpi_device_add(device
, acpi_device_release
);
1512 acpi_device_release(&device
->dev
);
1516 acpi_power_add_remove_device(device
, true);
1517 acpi_device_add_finalize(device
);
1518 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
1519 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Added %s [%s] parent %s\n",
1520 dev_name(&device
->dev
), (char *) buffer
.pointer
,
1521 device
->parent
? dev_name(&device
->parent
->dev
) : "(null)"));
1522 kfree(buffer
.pointer
);
1527 static acpi_status
acpi_get_resource_memory(struct acpi_resource
*ares
,
1530 struct resource
*res
= context
;
1532 if (acpi_dev_resource_memory(ares
, res
))
1533 return AE_CTRL_TERMINATE
;
1538 static bool acpi_device_should_be_hidden(acpi_handle handle
)
1541 struct resource res
;
1543 /* Check if it should ignore the UART device */
1544 if (!(spcr_uart_addr
&& acpi_has_method(handle
, METHOD_NAME__CRS
)))
1548 * The UART device described in SPCR table is assumed to have only one
1549 * memory resource present. So we only look for the first one here.
1551 status
= acpi_walk_resources(handle
, METHOD_NAME__CRS
,
1552 acpi_get_resource_memory
, &res
);
1553 if (ACPI_FAILURE(status
) || res
.start
!= spcr_uart_addr
)
1556 acpi_handle_info(handle
, "The UART device @%pa in SPCR table will be hidden\n",
1562 static int acpi_bus_type_and_status(acpi_handle handle
, int *type
,
1563 unsigned long long *sta
)
1566 acpi_object_type acpi_type
;
1568 status
= acpi_get_type(handle
, &acpi_type
);
1569 if (ACPI_FAILURE(status
))
1572 switch (acpi_type
) {
1573 case ACPI_TYPE_ANY
: /* for ACPI_ROOT_OBJECT */
1574 case ACPI_TYPE_DEVICE
:
1575 if (acpi_device_should_be_hidden(handle
))
1578 *type
= ACPI_BUS_TYPE_DEVICE
;
1579 status
= acpi_bus_get_status_handle(handle
, sta
);
1580 if (ACPI_FAILURE(status
))
1583 case ACPI_TYPE_PROCESSOR
:
1584 *type
= ACPI_BUS_TYPE_PROCESSOR
;
1585 status
= acpi_bus_get_status_handle(handle
, sta
);
1586 if (ACPI_FAILURE(status
))
1589 case ACPI_TYPE_THERMAL
:
1590 *type
= ACPI_BUS_TYPE_THERMAL
;
1591 *sta
= ACPI_STA_DEFAULT
;
1593 case ACPI_TYPE_POWER
:
1594 *type
= ACPI_BUS_TYPE_POWER
;
1595 *sta
= ACPI_STA_DEFAULT
;
1604 bool acpi_device_is_present(const struct acpi_device
*adev
)
1606 return adev
->status
.present
|| adev
->status
.functional
;
1609 static bool acpi_scan_handler_matching(struct acpi_scan_handler
*handler
,
1611 const struct acpi_device_id
**matchid
)
1613 const struct acpi_device_id
*devid
;
1616 return handler
->match(idstr
, matchid
);
1618 for (devid
= handler
->ids
; devid
->id
[0]; devid
++)
1619 if (!strcmp((char *)devid
->id
, idstr
)) {
1629 static struct acpi_scan_handler
*acpi_scan_match_handler(const char *idstr
,
1630 const struct acpi_device_id
**matchid
)
1632 struct acpi_scan_handler
*handler
;
1634 list_for_each_entry(handler
, &acpi_scan_handlers_list
, list_node
)
1635 if (acpi_scan_handler_matching(handler
, idstr
, matchid
))
1641 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile
*hotplug
, bool val
)
1643 if (!!hotplug
->enabled
== !!val
)
1646 mutex_lock(&acpi_scan_lock
);
1648 hotplug
->enabled
= val
;
1650 mutex_unlock(&acpi_scan_lock
);
1653 static void acpi_scan_init_hotplug(struct acpi_device
*adev
)
1655 struct acpi_hardware_id
*hwid
;
1657 if (acpi_dock_match(adev
->handle
) || is_ejectable_bay(adev
)) {
1658 acpi_dock_add(adev
);
1661 list_for_each_entry(hwid
, &adev
->pnp
.ids
, list
) {
1662 struct acpi_scan_handler
*handler
;
1664 handler
= acpi_scan_match_handler(hwid
->id
, NULL
);
1666 adev
->flags
.hotplug_notify
= true;
1672 static void acpi_device_dep_initialize(struct acpi_device
*adev
)
1674 struct acpi_dep_data
*dep
;
1675 struct acpi_handle_list dep_devices
;
1679 if (!acpi_has_method(adev
->handle
, "_DEP"))
1682 status
= acpi_evaluate_reference(adev
->handle
, "_DEP", NULL
,
1684 if (ACPI_FAILURE(status
)) {
1685 dev_dbg(&adev
->dev
, "Failed to evaluate _DEP.\n");
1689 for (i
= 0; i
< dep_devices
.count
; i
++) {
1690 struct acpi_device_info
*info
;
1693 status
= acpi_get_object_info(dep_devices
.handles
[i
], &info
);
1694 if (ACPI_FAILURE(status
)) {
1695 dev_dbg(&adev
->dev
, "Error reading _DEP device info\n");
1700 * Skip the dependency of Windows System Power
1701 * Management Controller
1703 skip
= info
->valid
& ACPI_VALID_HID
&&
1704 !strcmp(info
->hardware_id
.string
, "INT3396");
1711 dep
= kzalloc(sizeof(struct acpi_dep_data
), GFP_KERNEL
);
1715 dep
->master
= dep_devices
.handles
[i
];
1716 dep
->slave
= adev
->handle
;
1719 mutex_lock(&acpi_dep_list_lock
);
1720 list_add_tail(&dep
->node
, &acpi_dep_list
);
1721 mutex_unlock(&acpi_dep_list_lock
);
1725 static acpi_status
acpi_bus_check_add(acpi_handle handle
, u32 lvl_not_used
,
1726 void *not_used
, void **return_value
)
1728 struct acpi_device
*device
= NULL
;
1730 unsigned long long sta
;
1733 acpi_bus_get_device(handle
, &device
);
1737 result
= acpi_bus_type_and_status(handle
, &type
, &sta
);
1741 if (type
== ACPI_BUS_TYPE_POWER
) {
1742 acpi_add_power_resource(handle
);
1746 acpi_add_single_object(&device
, handle
, type
, sta
);
1748 return AE_CTRL_DEPTH
;
1750 acpi_scan_init_hotplug(device
);
1751 acpi_device_dep_initialize(device
);
1755 *return_value
= device
;
1760 static void acpi_default_enumeration(struct acpi_device
*device
)
1763 * Do not enumerate SPI/I2C slaves as they will be enumerated by their
1764 * respective parents.
1766 if (!device
->flags
.spi_i2c_slave
) {
1767 acpi_create_platform_device(device
, NULL
);
1768 acpi_device_set_enumerated(device
);
1770 blocking_notifier_call_chain(&acpi_reconfig_chain
,
1771 ACPI_RECONFIG_DEVICE_ADD
, device
);
1775 static const struct acpi_device_id generic_device_ids
[] = {
1776 {ACPI_DT_NAMESPACE_HID
, },
1780 static int acpi_generic_device_attach(struct acpi_device
*adev
,
1781 const struct acpi_device_id
*not_used
)
1784 * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
1785 * below can be unconditional.
1787 if (adev
->data
.of_compatible
)
1788 acpi_default_enumeration(adev
);
1793 static struct acpi_scan_handler generic_device_handler
= {
1794 .ids
= generic_device_ids
,
1795 .attach
= acpi_generic_device_attach
,
1798 static int acpi_scan_attach_handler(struct acpi_device
*device
)
1800 struct acpi_hardware_id
*hwid
;
1803 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
) {
1804 const struct acpi_device_id
*devid
;
1805 struct acpi_scan_handler
*handler
;
1807 handler
= acpi_scan_match_handler(hwid
->id
, &devid
);
1809 if (!handler
->attach
) {
1810 device
->pnp
.type
.platform_id
= 0;
1813 device
->handler
= handler
;
1814 ret
= handler
->attach(device
, devid
);
1818 device
->handler
= NULL
;
1827 static void acpi_bus_attach(struct acpi_device
*device
)
1829 struct acpi_device
*child
;
1833 if (ACPI_SUCCESS(acpi_bus_get_ejd(device
->handle
, &ejd
)))
1834 register_dock_dependent_device(device
, ejd
);
1836 acpi_bus_get_status(device
);
1837 /* Skip devices that are not present. */
1838 if (!acpi_device_is_present(device
)) {
1839 device
->flags
.initialized
= false;
1840 acpi_device_clear_enumerated(device
);
1841 device
->flags
.power_manageable
= 0;
1844 if (device
->handler
)
1847 if (!device
->flags
.initialized
) {
1848 device
->flags
.power_manageable
=
1849 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
;
1850 if (acpi_bus_init_power(device
))
1851 device
->flags
.power_manageable
= 0;
1853 device
->flags
.initialized
= true;
1854 } else if (device
->flags
.visited
) {
1858 ret
= acpi_scan_attach_handler(device
);
1862 device
->flags
.match_driver
= true;
1863 if (ret
> 0 && !device
->flags
.spi_i2c_slave
) {
1864 acpi_device_set_enumerated(device
);
1868 ret
= device_attach(&device
->dev
);
1872 if (!device
->pnp
.type
.platform_id
&& !device
->flags
.spi_i2c_slave
)
1873 acpi_device_set_enumerated(device
);
1875 acpi_default_enumeration(device
);
1878 list_for_each_entry(child
, &device
->children
, node
)
1879 acpi_bus_attach(child
);
1881 if (device
->handler
&& device
->handler
->hotplug
.notify_online
)
1882 device
->handler
->hotplug
.notify_online(device
);
1885 void acpi_walk_dep_device_list(acpi_handle handle
)
1887 struct acpi_dep_data
*dep
, *tmp
;
1888 struct acpi_device
*adev
;
1890 mutex_lock(&acpi_dep_list_lock
);
1891 list_for_each_entry_safe(dep
, tmp
, &acpi_dep_list
, node
) {
1892 if (dep
->master
== handle
) {
1893 acpi_bus_get_device(dep
->slave
, &adev
);
1898 if (!adev
->dep_unmet
)
1899 acpi_bus_attach(adev
);
1900 list_del(&dep
->node
);
1904 mutex_unlock(&acpi_dep_list_lock
);
1906 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list
);
1909 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1910 * @handle: Root of the namespace scope to scan.
1912 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1915 * If no devices were found, -ENODEV is returned, but it does not mean that
1916 * there has been a real error. There just have been no suitable ACPI objects
1917 * in the table trunk from which the kernel could create a device and add an
1918 * appropriate driver.
1920 * Must be called under acpi_scan_lock.
1922 int acpi_bus_scan(acpi_handle handle
)
1924 void *device
= NULL
;
1926 if (ACPI_SUCCESS(acpi_bus_check_add(handle
, 0, NULL
, &device
)))
1927 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
1928 acpi_bus_check_add
, NULL
, NULL
, &device
);
1931 acpi_bus_attach(device
);
1936 EXPORT_SYMBOL(acpi_bus_scan
);
1939 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
1940 * @adev: Root of the ACPI namespace scope to walk.
1942 * Must be called under acpi_scan_lock.
1944 void acpi_bus_trim(struct acpi_device
*adev
)
1946 struct acpi_scan_handler
*handler
= adev
->handler
;
1947 struct acpi_device
*child
;
1949 list_for_each_entry_reverse(child
, &adev
->children
, node
)
1950 acpi_bus_trim(child
);
1952 adev
->flags
.match_driver
= false;
1954 if (handler
->detach
)
1955 handler
->detach(adev
);
1957 adev
->handler
= NULL
;
1959 device_release_driver(&adev
->dev
);
1962 * Most likely, the device is going away, so put it into D3cold before
1965 acpi_device_set_power(adev
, ACPI_STATE_D3_COLD
);
1966 adev
->flags
.initialized
= false;
1967 acpi_device_clear_enumerated(adev
);
1969 EXPORT_SYMBOL_GPL(acpi_bus_trim
);
1971 static int acpi_bus_scan_fixed(void)
1976 * Enumerate all fixed-feature devices.
1978 if (!(acpi_gbl_FADT
.flags
& ACPI_FADT_POWER_BUTTON
)) {
1979 struct acpi_device
*device
= NULL
;
1981 result
= acpi_add_single_object(&device
, NULL
,
1982 ACPI_BUS_TYPE_POWER_BUTTON
,
1987 device
->flags
.match_driver
= true;
1988 result
= device_attach(&device
->dev
);
1992 device_init_wakeup(&device
->dev
, true);
1995 if (!(acpi_gbl_FADT
.flags
& ACPI_FADT_SLEEP_BUTTON
)) {
1996 struct acpi_device
*device
= NULL
;
1998 result
= acpi_add_single_object(&device
, NULL
,
1999 ACPI_BUS_TYPE_SLEEP_BUTTON
,
2004 device
->flags
.match_driver
= true;
2005 result
= device_attach(&device
->dev
);
2008 return result
< 0 ? result
: 0;
2011 static void __init
acpi_get_spcr_uart_addr(void)
2014 struct acpi_table_spcr
*spcr_ptr
;
2016 status
= acpi_get_table(ACPI_SIG_SPCR
, 0,
2017 (struct acpi_table_header
**)&spcr_ptr
);
2018 if (ACPI_SUCCESS(status
))
2019 spcr_uart_addr
= spcr_ptr
->serial_port
.address
;
2021 printk(KERN_WARNING PREFIX
"STAO table present, but SPCR is missing\n");
2024 static bool acpi_scan_initialized
;
2026 int __init
acpi_scan_init(void)
2030 struct acpi_table_stao
*stao_ptr
;
2032 acpi_pci_root_init();
2033 acpi_pci_link_init();
2034 acpi_processor_init();
2037 acpi_cmos_rtc_init();
2038 acpi_container_init();
2039 acpi_memory_hotplug_init();
2041 acpi_int340x_thermal_init();
2043 acpi_watchdog_init();
2045 acpi_scan_add_handler(&generic_device_handler
);
2048 * If there is STAO table, check whether it needs to ignore the UART
2049 * device in SPCR table.
2051 status
= acpi_get_table(ACPI_SIG_STAO
, 0,
2052 (struct acpi_table_header
**)&stao_ptr
);
2053 if (ACPI_SUCCESS(status
)) {
2054 if (stao_ptr
->header
.length
> sizeof(struct acpi_table_stao
))
2055 printk(KERN_INFO PREFIX
"STAO Name List not yet supported.");
2057 if (stao_ptr
->ignore_uart
)
2058 acpi_get_spcr_uart_addr();
2061 mutex_lock(&acpi_scan_lock
);
2063 * Enumerate devices in the ACPI namespace.
2065 result
= acpi_bus_scan(ACPI_ROOT_OBJECT
);
2069 result
= acpi_bus_get_device(ACPI_ROOT_OBJECT
, &acpi_root
);
2073 /* Fixed feature devices do not exist on HW-reduced platform */
2074 if (!acpi_gbl_reduced_hardware
) {
2075 result
= acpi_bus_scan_fixed();
2077 acpi_detach_data(acpi_root
->handle
,
2078 acpi_scan_drop_device
);
2079 acpi_device_del(acpi_root
);
2080 put_device(&acpi_root
->dev
);
2085 acpi_gpe_apply_masked_gpes();
2086 acpi_update_all_gpes();
2088 acpi_scan_initialized
= true;
2091 mutex_unlock(&acpi_scan_lock
);
2095 static struct acpi_probe_entry
*ape
;
2096 static int acpi_probe_count
;
2097 static DEFINE_MUTEX(acpi_probe_mutex
);
2099 static int __init
acpi_match_madt(struct acpi_subtable_header
*header
,
2100 const unsigned long end
)
2102 if (!ape
->subtable_valid
|| ape
->subtable_valid(header
, ape
))
2103 if (!ape
->probe_subtbl(header
, end
))
2109 int __init
__acpi_probe_device_table(struct acpi_probe_entry
*ap_head
, int nr
)
2116 mutex_lock(&acpi_probe_mutex
);
2117 for (ape
= ap_head
; nr
; ape
++, nr
--) {
2118 if (ACPI_COMPARE_NAME(ACPI_SIG_MADT
, ape
->id
)) {
2119 acpi_probe_count
= 0;
2120 acpi_table_parse_madt(ape
->type
, acpi_match_madt
, 0);
2121 count
+= acpi_probe_count
;
2124 res
= acpi_table_parse(ape
->id
, ape
->probe_table
);
2129 mutex_unlock(&acpi_probe_mutex
);
2134 struct acpi_table_events_work
{
2135 struct work_struct work
;
2140 static void acpi_table_events_fn(struct work_struct
*work
)
2142 struct acpi_table_events_work
*tew
;
2144 tew
= container_of(work
, struct acpi_table_events_work
, work
);
2146 if (tew
->event
== ACPI_TABLE_EVENT_LOAD
) {
2147 acpi_scan_lock_acquire();
2148 acpi_bus_scan(ACPI_ROOT_OBJECT
);
2149 acpi_scan_lock_release();
2155 void acpi_scan_table_handler(u32 event
, void *table
, void *context
)
2157 struct acpi_table_events_work
*tew
;
2159 if (!acpi_scan_initialized
)
2162 if (event
!= ACPI_TABLE_EVENT_LOAD
)
2165 tew
= kmalloc(sizeof(*tew
), GFP_KERNEL
);
2169 INIT_WORK(&tew
->work
, acpi_table_events_fn
);
2173 schedule_work(&tew
->work
);
2176 int acpi_reconfig_notifier_register(struct notifier_block
*nb
)
2178 return blocking_notifier_chain_register(&acpi_reconfig_chain
, nb
);
2180 EXPORT_SYMBOL(acpi_reconfig_notifier_register
);
2182 int acpi_reconfig_notifier_unregister(struct notifier_block
*nb
)
2184 return blocking_notifier_chain_unregister(&acpi_reconfig_chain
, nb
);
2186 EXPORT_SYMBOL(acpi_reconfig_notifier_unregister
);