2 * scan.c - support for transforming the ACPI namespace into individual objects
5 #include <linux/module.h>
6 #include <linux/init.h>
7 #include <linux/slab.h>
8 #include <linux/kernel.h>
9 #include <linux/acpi.h>
10 #include <linux/signal.h>
11 #include <linux/kthread.h>
12 #include <linux/dmi.h>
13 #include <linux/nls.h>
15 #include <asm/pgtable.h>
19 #define _COMPONENT ACPI_BUS_COMPONENT
20 ACPI_MODULE_NAME("scan");
21 extern struct acpi_device
*acpi_root
;
23 #define ACPI_BUS_CLASS "system_bus"
24 #define ACPI_BUS_HID "LNXSYBUS"
25 #define ACPI_BUS_DEVICE_NAME "System Bus"
27 #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
29 #define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page)
32 * If set, devices will be hot-removed even if they cannot be put offline
33 * gracefully (from the kernel's standpoint).
35 bool acpi_force_hot_remove
;
37 static const char *dummy_hid
= "device";
39 static LIST_HEAD(acpi_dep_list
);
40 static DEFINE_MUTEX(acpi_dep_list_lock
);
41 static LIST_HEAD(acpi_bus_id_list
);
42 static DEFINE_MUTEX(acpi_scan_lock
);
43 static LIST_HEAD(acpi_scan_handlers_list
);
44 DEFINE_MUTEX(acpi_device_lock
);
45 LIST_HEAD(acpi_wakeup_device_list
);
46 static DEFINE_MUTEX(acpi_hp_context_lock
);
48 struct acpi_dep_data
{
49 struct list_head node
;
54 struct acpi_device_bus_id
{
56 unsigned int instance_no
;
57 struct list_head node
;
60 void acpi_scan_lock_acquire(void)
62 mutex_lock(&acpi_scan_lock
);
64 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire
);
66 void acpi_scan_lock_release(void)
68 mutex_unlock(&acpi_scan_lock
);
70 EXPORT_SYMBOL_GPL(acpi_scan_lock_release
);
72 void acpi_lock_hp_context(void)
74 mutex_lock(&acpi_hp_context_lock
);
77 void acpi_unlock_hp_context(void)
79 mutex_unlock(&acpi_hp_context_lock
);
82 void acpi_initialize_hp_context(struct acpi_device
*adev
,
83 struct acpi_hotplug_context
*hp
,
84 int (*notify
)(struct acpi_device
*, u32
),
85 void (*uevent
)(struct acpi_device
*, u32
))
87 acpi_lock_hp_context();
90 acpi_set_hp_context(adev
, hp
);
91 acpi_unlock_hp_context();
93 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context
);
95 int acpi_scan_add_handler(struct acpi_scan_handler
*handler
)
100 list_add_tail(&handler
->list_node
, &acpi_scan_handlers_list
);
104 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler
*handler
,
105 const char *hotplug_profile_name
)
109 error
= acpi_scan_add_handler(handler
);
113 acpi_sysfs_add_hotplug_profile(&handler
->hotplug
, hotplug_profile_name
);
118 * Creates hid/cid(s) string needed for modalias and uevent
119 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
120 * char *modalias: "acpi:IBM0001:ACPI0001"
121 * Return: 0: no _HID and no _CID
122 * -EINVAL: output error
123 * -ENOMEM: output is truncated
125 static int create_modalias(struct acpi_device
*acpi_dev
, char *modalias
,
130 struct acpi_hardware_id
*id
;
132 if (list_empty(&acpi_dev
->pnp
.ids
))
136 * If the device has PRP0001 we expose DT compatible modalias
137 * instead in form of of:NnameTCcompatible.
139 if (acpi_dev
->data
.of_compatible
) {
140 struct acpi_buffer buf
= { ACPI_ALLOCATE_BUFFER
};
141 const union acpi_object
*of_compatible
, *obj
;
145 acpi_get_name(acpi_dev
->handle
, ACPI_SINGLE_NAME
, &buf
);
146 /* DT strings are all in lower case */
147 for (c
= buf
.pointer
; *c
!= '\0'; c
++)
150 len
= snprintf(modalias
, size
, "of:N%sT", (char *)buf
.pointer
);
151 ACPI_FREE(buf
.pointer
);
153 of_compatible
= acpi_dev
->data
.of_compatible
;
154 if (of_compatible
->type
== ACPI_TYPE_PACKAGE
) {
155 nval
= of_compatible
->package
.count
;
156 obj
= of_compatible
->package
.elements
;
157 } else { /* Must be ACPI_TYPE_STRING. */
161 for (i
= 0; i
< nval
; i
++, obj
++) {
162 count
= snprintf(&modalias
[len
], size
, "C%s",
163 obj
->string
.pointer
);
173 len
= snprintf(modalias
, size
, "acpi:");
176 list_for_each_entry(id
, &acpi_dev
->pnp
.ids
, list
) {
177 count
= snprintf(&modalias
[len
], size
, "%s:", id
->id
);
187 modalias
[len
] = '\0';
192 * acpi_companion_match() - Can we match via ACPI companion device
193 * @dev: Device in question
195 * Check if the given device has an ACPI companion and if that companion has
196 * a valid list of PNP IDs, and if the device is the first (primary) physical
197 * device associated with it.
199 * If multiple physical devices are attached to a single ACPI companion, we need
200 * to be careful. The usage scenario for this kind of relationship is that all
201 * of the physical devices in question use resources provided by the ACPI
202 * companion. A typical case is an MFD device where all the sub-devices share
203 * the parent's ACPI companion. In such cases we can only allow the primary
204 * (first) physical device to be matched with the help of the companion's PNP
207 * Additional physical devices sharing the ACPI companion can still use
208 * resources available from it but they will be matched normally using functions
209 * provided by their bus types (and analogously for their modalias).
211 static bool acpi_companion_match(const struct device
*dev
)
213 struct acpi_device
*adev
;
216 adev
= ACPI_COMPANION(dev
);
220 if (list_empty(&adev
->pnp
.ids
))
223 mutex_lock(&adev
->physical_node_lock
);
224 if (list_empty(&adev
->physical_node_list
)) {
227 const struct acpi_device_physical_node
*node
;
229 node
= list_first_entry(&adev
->physical_node_list
,
230 struct acpi_device_physical_node
, node
);
231 ret
= node
->dev
== dev
;
233 mutex_unlock(&adev
->physical_node_lock
);
239 * Creates uevent modalias field for ACPI enumerated devices.
240 * Because the other buses does not support ACPI HIDs & CIDs.
241 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
242 * "acpi:IBM0001:ACPI0001"
244 int acpi_device_uevent_modalias(struct device
*dev
, struct kobj_uevent_env
*env
)
248 if (!acpi_companion_match(dev
))
251 if (add_uevent_var(env
, "MODALIAS="))
253 len
= create_modalias(ACPI_COMPANION(dev
), &env
->buf
[env
->buflen
- 1],
254 sizeof(env
->buf
) - env
->buflen
);
260 EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias
);
263 * Creates modalias sysfs attribute for ACPI enumerated devices.
264 * Because the other buses does not support ACPI HIDs & CIDs.
265 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
266 * "acpi:IBM0001:ACPI0001"
268 int acpi_device_modalias(struct device
*dev
, char *buf
, int size
)
272 if (!acpi_companion_match(dev
))
275 len
= create_modalias(ACPI_COMPANION(dev
), buf
, size
-1);
281 EXPORT_SYMBOL_GPL(acpi_device_modalias
);
284 acpi_device_modalias_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
285 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
288 len
= create_modalias(acpi_dev
, buf
, 1024);
294 static DEVICE_ATTR(modalias
, 0444, acpi_device_modalias_show
, NULL
);
296 bool acpi_scan_is_offline(struct acpi_device
*adev
, bool uevent
)
298 struct acpi_device_physical_node
*pn
;
301 mutex_lock(&adev
->physical_node_lock
);
303 list_for_each_entry(pn
, &adev
->physical_node_list
, node
)
304 if (device_supports_offline(pn
->dev
) && !pn
->dev
->offline
) {
306 kobject_uevent(&pn
->dev
->kobj
, KOBJ_CHANGE
);
312 mutex_unlock(&adev
->physical_node_lock
);
316 static acpi_status
acpi_bus_offline(acpi_handle handle
, u32 lvl
, void *data
,
319 struct acpi_device
*device
= NULL
;
320 struct acpi_device_physical_node
*pn
;
321 bool second_pass
= (bool)data
;
322 acpi_status status
= AE_OK
;
324 if (acpi_bus_get_device(handle
, &device
))
327 if (device
->handler
&& !device
->handler
->hotplug
.enabled
) {
328 *ret_p
= &device
->dev
;
332 mutex_lock(&device
->physical_node_lock
);
334 list_for_each_entry(pn
, &device
->physical_node_list
, node
) {
338 /* Skip devices offlined by the first pass. */
342 pn
->put_online
= false;
344 ret
= device_offline(pn
->dev
);
345 if (acpi_force_hot_remove
)
349 pn
->put_online
= !ret
;
359 mutex_unlock(&device
->physical_node_lock
);
364 static acpi_status
acpi_bus_online(acpi_handle handle
, u32 lvl
, void *data
,
367 struct acpi_device
*device
= NULL
;
368 struct acpi_device_physical_node
*pn
;
370 if (acpi_bus_get_device(handle
, &device
))
373 mutex_lock(&device
->physical_node_lock
);
375 list_for_each_entry(pn
, &device
->physical_node_list
, node
)
376 if (pn
->put_online
) {
377 device_online(pn
->dev
);
378 pn
->put_online
= false;
381 mutex_unlock(&device
->physical_node_lock
);
386 static int acpi_scan_try_to_offline(struct acpi_device
*device
)
388 acpi_handle handle
= device
->handle
;
389 struct device
*errdev
= NULL
;
393 * Carry out two passes here and ignore errors in the first pass,
394 * because if the devices in question are memory blocks and
395 * CONFIG_MEMCG is set, one of the blocks may hold data structures
396 * that the other blocks depend on, but it is not known in advance which
399 * If the first pass is successful, the second one isn't needed, though.
401 status
= acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
402 NULL
, acpi_bus_offline
, (void *)false,
404 if (status
== AE_SUPPORT
) {
405 dev_warn(errdev
, "Offline disabled.\n");
406 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
407 acpi_bus_online
, NULL
, NULL
, NULL
);
410 acpi_bus_offline(handle
, 0, (void *)false, (void **)&errdev
);
413 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
414 NULL
, acpi_bus_offline
, (void *)true,
416 if (!errdev
|| acpi_force_hot_remove
)
417 acpi_bus_offline(handle
, 0, (void *)true,
420 if (errdev
&& !acpi_force_hot_remove
) {
421 dev_warn(errdev
, "Offline failed.\n");
422 acpi_bus_online(handle
, 0, NULL
, NULL
);
423 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
,
424 ACPI_UINT32_MAX
, acpi_bus_online
,
432 static int acpi_scan_hot_remove(struct acpi_device
*device
)
434 acpi_handle handle
= device
->handle
;
435 unsigned long long sta
;
438 if (device
->handler
&& device
->handler
->hotplug
.demand_offline
439 && !acpi_force_hot_remove
) {
440 if (!acpi_scan_is_offline(device
, true))
443 int error
= acpi_scan_try_to_offline(device
);
448 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
449 "Hot-removing device %s...\n", dev_name(&device
->dev
)));
451 acpi_bus_trim(device
);
453 acpi_evaluate_lck(handle
, 0);
457 status
= acpi_evaluate_ej0(handle
);
458 if (status
== AE_NOT_FOUND
)
460 else if (ACPI_FAILURE(status
))
464 * Verify if eject was indeed successful. If not, log an error
465 * message. No need to call _OST since _EJ0 call was made OK.
467 status
= acpi_evaluate_integer(handle
, "_STA", NULL
, &sta
);
468 if (ACPI_FAILURE(status
)) {
469 acpi_handle_warn(handle
,
470 "Status check after eject failed (0x%x)\n", status
);
471 } else if (sta
& ACPI_STA_DEVICE_ENABLED
) {
472 acpi_handle_warn(handle
,
473 "Eject incomplete - status 0x%llx\n", sta
);
479 static int acpi_scan_device_not_present(struct acpi_device
*adev
)
481 if (!acpi_device_enumerated(adev
)) {
482 dev_warn(&adev
->dev
, "Still not present\n");
489 static int acpi_scan_device_check(struct acpi_device
*adev
)
493 acpi_bus_get_status(adev
);
494 if (adev
->status
.present
|| adev
->status
.functional
) {
496 * This function is only called for device objects for which
497 * matching scan handlers exist. The only situation in which
498 * the scan handler is not attached to this device object yet
499 * is when the device has just appeared (either it wasn't
500 * present at all before or it was removed and then added
504 dev_warn(&adev
->dev
, "Already enumerated\n");
507 error
= acpi_bus_scan(adev
->handle
);
509 dev_warn(&adev
->dev
, "Namespace scan failure\n");
512 if (!adev
->handler
) {
513 dev_warn(&adev
->dev
, "Enumeration failure\n");
517 error
= acpi_scan_device_not_present(adev
);
522 static int acpi_scan_bus_check(struct acpi_device
*adev
)
524 struct acpi_scan_handler
*handler
= adev
->handler
;
525 struct acpi_device
*child
;
528 acpi_bus_get_status(adev
);
529 if (!(adev
->status
.present
|| adev
->status
.functional
)) {
530 acpi_scan_device_not_present(adev
);
533 if (handler
&& handler
->hotplug
.scan_dependent
)
534 return handler
->hotplug
.scan_dependent(adev
);
536 error
= acpi_bus_scan(adev
->handle
);
538 dev_warn(&adev
->dev
, "Namespace scan failure\n");
541 list_for_each_entry(child
, &adev
->children
, node
) {
542 error
= acpi_scan_bus_check(child
);
549 static int acpi_generic_hotplug_event(struct acpi_device
*adev
, u32 type
)
552 case ACPI_NOTIFY_BUS_CHECK
:
553 return acpi_scan_bus_check(adev
);
554 case ACPI_NOTIFY_DEVICE_CHECK
:
555 return acpi_scan_device_check(adev
);
556 case ACPI_NOTIFY_EJECT_REQUEST
:
557 case ACPI_OST_EC_OSPM_EJECT
:
558 if (adev
->handler
&& !adev
->handler
->hotplug
.enabled
) {
559 dev_info(&adev
->dev
, "Eject disabled\n");
562 acpi_evaluate_ost(adev
->handle
, ACPI_NOTIFY_EJECT_REQUEST
,
563 ACPI_OST_SC_EJECT_IN_PROGRESS
, NULL
);
564 return acpi_scan_hot_remove(adev
);
569 void acpi_device_hotplug(struct acpi_device
*adev
, u32 src
)
571 u32 ost_code
= ACPI_OST_SC_NON_SPECIFIC_FAILURE
;
574 lock_device_hotplug();
575 mutex_lock(&acpi_scan_lock
);
578 * The device object's ACPI handle cannot become invalid as long as we
579 * are holding acpi_scan_lock, but it might have become invalid before
580 * that lock was acquired.
582 if (adev
->handle
== INVALID_ACPI_HANDLE
)
585 if (adev
->flags
.is_dock_station
) {
586 error
= dock_notify(adev
, src
);
587 } else if (adev
->flags
.hotplug_notify
) {
588 error
= acpi_generic_hotplug_event(adev
, src
);
589 if (error
== -EPERM
) {
590 ost_code
= ACPI_OST_SC_EJECT_NOT_SUPPORTED
;
594 int (*notify
)(struct acpi_device
*, u32
);
596 acpi_lock_hp_context();
597 notify
= adev
->hp
? adev
->hp
->notify
: NULL
;
598 acpi_unlock_hp_context();
600 * There may be additional notify handlers for device objects
601 * without the .event() callback, so ignore them here.
604 error
= notify(adev
, src
);
609 ost_code
= ACPI_OST_SC_SUCCESS
;
612 acpi_evaluate_ost(adev
->handle
, src
, ost_code
, NULL
);
615 acpi_bus_put_acpi_device(adev
);
616 mutex_unlock(&acpi_scan_lock
);
617 unlock_device_hotplug();
620 static ssize_t
real_power_state_show(struct device
*dev
,
621 struct device_attribute
*attr
, char *buf
)
623 struct acpi_device
*adev
= to_acpi_device(dev
);
627 ret
= acpi_device_get_power(adev
, &state
);
631 return sprintf(buf
, "%s\n", acpi_power_state_string(state
));
634 static DEVICE_ATTR(real_power_state
, 0444, real_power_state_show
, NULL
);
636 static ssize_t
power_state_show(struct device
*dev
,
637 struct device_attribute
*attr
, char *buf
)
639 struct acpi_device
*adev
= to_acpi_device(dev
);
641 return sprintf(buf
, "%s\n", acpi_power_state_string(adev
->power
.state
));
644 static DEVICE_ATTR(power_state
, 0444, power_state_show
, NULL
);
647 acpi_eject_store(struct device
*d
, struct device_attribute
*attr
,
648 const char *buf
, size_t count
)
650 struct acpi_device
*acpi_device
= to_acpi_device(d
);
651 acpi_object_type not_used
;
654 if (!count
|| buf
[0] != '1')
657 if ((!acpi_device
->handler
|| !acpi_device
->handler
->hotplug
.enabled
)
658 && !acpi_device
->driver
)
661 status
= acpi_get_type(acpi_device
->handle
, ¬_used
);
662 if (ACPI_FAILURE(status
) || !acpi_device
->flags
.ejectable
)
665 get_device(&acpi_device
->dev
);
666 status
= acpi_hotplug_schedule(acpi_device
, ACPI_OST_EC_OSPM_EJECT
);
667 if (ACPI_SUCCESS(status
))
670 put_device(&acpi_device
->dev
);
671 acpi_evaluate_ost(acpi_device
->handle
, ACPI_OST_EC_OSPM_EJECT
,
672 ACPI_OST_SC_NON_SPECIFIC_FAILURE
, NULL
);
673 return status
== AE_NO_MEMORY
? -ENOMEM
: -EAGAIN
;
676 static DEVICE_ATTR(eject
, 0200, NULL
, acpi_eject_store
);
679 acpi_device_hid_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
680 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
682 return sprintf(buf
, "%s\n", acpi_device_hid(acpi_dev
));
684 static DEVICE_ATTR(hid
, 0444, acpi_device_hid_show
, NULL
);
686 static ssize_t
acpi_device_uid_show(struct device
*dev
,
687 struct device_attribute
*attr
, char *buf
)
689 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
691 return sprintf(buf
, "%s\n", acpi_dev
->pnp
.unique_id
);
693 static DEVICE_ATTR(uid
, 0444, acpi_device_uid_show
, NULL
);
695 static ssize_t
acpi_device_adr_show(struct device
*dev
,
696 struct device_attribute
*attr
, char *buf
)
698 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
700 return sprintf(buf
, "0x%08x\n",
701 (unsigned int)(acpi_dev
->pnp
.bus_address
));
703 static DEVICE_ATTR(adr
, 0444, acpi_device_adr_show
, NULL
);
706 acpi_device_path_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
707 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
708 struct acpi_buffer path
= {ACPI_ALLOCATE_BUFFER
, NULL
};
711 result
= acpi_get_name(acpi_dev
->handle
, ACPI_FULL_PATHNAME
, &path
);
715 result
= sprintf(buf
, "%s\n", (char*)path
.pointer
);
720 static DEVICE_ATTR(path
, 0444, acpi_device_path_show
, NULL
);
722 /* sysfs file that shows description text from the ACPI _STR method */
723 static ssize_t
description_show(struct device
*dev
,
724 struct device_attribute
*attr
,
726 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
729 if (acpi_dev
->pnp
.str_obj
== NULL
)
733 * The _STR object contains a Unicode identifier for a device.
734 * We need to convert to utf-8 so it can be displayed.
736 result
= utf16s_to_utf8s(
737 (wchar_t *)acpi_dev
->pnp
.str_obj
->buffer
.pointer
,
738 acpi_dev
->pnp
.str_obj
->buffer
.length
,
739 UTF16_LITTLE_ENDIAN
, buf
,
742 buf
[result
++] = '\n';
746 static DEVICE_ATTR(description
, 0444, description_show
, NULL
);
749 acpi_device_sun_show(struct device
*dev
, struct device_attribute
*attr
,
751 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
753 unsigned long long sun
;
755 status
= acpi_evaluate_integer(acpi_dev
->handle
, "_SUN", NULL
, &sun
);
756 if (ACPI_FAILURE(status
))
759 return sprintf(buf
, "%llu\n", sun
);
761 static DEVICE_ATTR(sun
, 0444, acpi_device_sun_show
, NULL
);
763 static ssize_t
status_show(struct device
*dev
, struct device_attribute
*attr
,
765 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
767 unsigned long long sta
;
769 status
= acpi_evaluate_integer(acpi_dev
->handle
, "_STA", NULL
, &sta
);
770 if (ACPI_FAILURE(status
))
773 return sprintf(buf
, "%llu\n", sta
);
775 static DEVICE_ATTR_RO(status
);
777 static int acpi_device_setup_files(struct acpi_device
*dev
)
779 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
784 * Devices gotten from FADT don't have a "path" attribute
787 result
= device_create_file(&dev
->dev
, &dev_attr_path
);
792 if (!list_empty(&dev
->pnp
.ids
)) {
793 result
= device_create_file(&dev
->dev
, &dev_attr_hid
);
797 result
= device_create_file(&dev
->dev
, &dev_attr_modalias
);
803 * If device has _STR, 'description' file is created
805 if (acpi_has_method(dev
->handle
, "_STR")) {
806 status
= acpi_evaluate_object(dev
->handle
, "_STR",
808 if (ACPI_FAILURE(status
))
809 buffer
.pointer
= NULL
;
810 dev
->pnp
.str_obj
= buffer
.pointer
;
811 result
= device_create_file(&dev
->dev
, &dev_attr_description
);
816 if (dev
->pnp
.type
.bus_address
)
817 result
= device_create_file(&dev
->dev
, &dev_attr_adr
);
818 if (dev
->pnp
.unique_id
)
819 result
= device_create_file(&dev
->dev
, &dev_attr_uid
);
821 if (acpi_has_method(dev
->handle
, "_SUN")) {
822 result
= device_create_file(&dev
->dev
, &dev_attr_sun
);
827 if (acpi_has_method(dev
->handle
, "_STA")) {
828 result
= device_create_file(&dev
->dev
, &dev_attr_status
);
834 * If device has _EJ0, 'eject' file is created that is used to trigger
835 * hot-removal function from userland.
837 if (acpi_has_method(dev
->handle
, "_EJ0")) {
838 result
= device_create_file(&dev
->dev
, &dev_attr_eject
);
843 if (dev
->flags
.power_manageable
) {
844 result
= device_create_file(&dev
->dev
, &dev_attr_power_state
);
848 if (dev
->power
.flags
.power_resources
)
849 result
= device_create_file(&dev
->dev
,
850 &dev_attr_real_power_state
);
857 static void acpi_device_remove_files(struct acpi_device
*dev
)
859 if (dev
->flags
.power_manageable
) {
860 device_remove_file(&dev
->dev
, &dev_attr_power_state
);
861 if (dev
->power
.flags
.power_resources
)
862 device_remove_file(&dev
->dev
,
863 &dev_attr_real_power_state
);
867 * If device has _STR, remove 'description' file
869 if (acpi_has_method(dev
->handle
, "_STR")) {
870 kfree(dev
->pnp
.str_obj
);
871 device_remove_file(&dev
->dev
, &dev_attr_description
);
874 * If device has _EJ0, remove 'eject' file.
876 if (acpi_has_method(dev
->handle
, "_EJ0"))
877 device_remove_file(&dev
->dev
, &dev_attr_eject
);
879 if (acpi_has_method(dev
->handle
, "_SUN"))
880 device_remove_file(&dev
->dev
, &dev_attr_sun
);
882 if (dev
->pnp
.unique_id
)
883 device_remove_file(&dev
->dev
, &dev_attr_uid
);
884 if (dev
->pnp
.type
.bus_address
)
885 device_remove_file(&dev
->dev
, &dev_attr_adr
);
886 device_remove_file(&dev
->dev
, &dev_attr_modalias
);
887 device_remove_file(&dev
->dev
, &dev_attr_hid
);
888 if (acpi_has_method(dev
->handle
, "_STA"))
889 device_remove_file(&dev
->dev
, &dev_attr_status
);
891 device_remove_file(&dev
->dev
, &dev_attr_path
);
893 /* --------------------------------------------------------------------------
895 -------------------------------------------------------------------------- */
897 static const struct acpi_device_id
*__acpi_match_device(
898 struct acpi_device
*device
, const struct acpi_device_id
*ids
)
900 const struct acpi_device_id
*id
;
901 struct acpi_hardware_id
*hwid
;
904 * If the device is not present, it is unnecessary to load device
907 if (!device
->status
.present
)
910 for (id
= ids
; id
->id
[0]; id
++)
911 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
)
912 if (!strcmp((char *) id
->id
, hwid
->id
))
919 * acpi_match_device - Match a struct device against a given list of ACPI IDs
920 * @ids: Array of struct acpi_device_id object to match against.
921 * @dev: The device structure to match.
923 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
924 * object for that handle and use that object to match against a given list of
927 * Return a pointer to the first matching ID on success or %NULL on failure.
929 const struct acpi_device_id
*acpi_match_device(const struct acpi_device_id
*ids
,
930 const struct device
*dev
)
932 struct acpi_device
*adev
;
933 acpi_handle handle
= ACPI_HANDLE(dev
);
935 if (!ids
|| !handle
|| acpi_bus_get_device(handle
, &adev
))
938 if (!acpi_companion_match(dev
))
941 return __acpi_match_device(adev
, ids
);
943 EXPORT_SYMBOL_GPL(acpi_match_device
);
945 int acpi_match_device_ids(struct acpi_device
*device
,
946 const struct acpi_device_id
*ids
)
948 return __acpi_match_device(device
, ids
) ? 0 : -ENOENT
;
950 EXPORT_SYMBOL(acpi_match_device_ids
);
953 * acpi_of_match_device - Match device using the "compatible" property.
954 * @dev: Device to match.
955 * @of_match_table: List of device IDs to match against.
957 * If @dev has an ACPI companion which has the special PRP0001 device ID in its
958 * list of identifiers and a _DSD object with the "compatible" property, use
959 * that property to match against the given list of identifiers.
961 static bool acpi_of_match_device(struct device
*dev
,
962 const struct of_device_id
*of_match_table
)
964 const union acpi_object
*of_compatible
, *obj
;
965 struct acpi_device
*adev
;
968 adev
= ACPI_COMPANION(dev
);
972 of_compatible
= adev
->data
.of_compatible
;
973 if (!of_match_table
|| !of_compatible
)
976 if (of_compatible
->type
== ACPI_TYPE_PACKAGE
) {
977 nval
= of_compatible
->package
.count
;
978 obj
= of_compatible
->package
.elements
;
979 } else { /* Must be ACPI_TYPE_STRING. */
983 /* Now we can look for the driver DT compatible strings */
984 for (i
= 0; i
< nval
; i
++, obj
++) {
985 const struct of_device_id
*id
;
987 for (id
= of_match_table
; id
->compatible
[0]; id
++)
988 if (!strcasecmp(obj
->string
.pointer
, id
->compatible
))
995 bool acpi_driver_match_device(struct device
*dev
,
996 const struct device_driver
*drv
)
998 if (!drv
->acpi_match_table
)
999 return acpi_of_match_device(dev
, drv
->of_match_table
);
1001 return !!acpi_match_device(drv
->acpi_match_table
, dev
);
1003 EXPORT_SYMBOL_GPL(acpi_driver_match_device
);
1005 static void acpi_free_power_resources_lists(struct acpi_device
*device
)
1009 if (device
->wakeup
.flags
.valid
)
1010 acpi_power_resources_list_free(&device
->wakeup
.resources
);
1012 if (!device
->power
.flags
.power_resources
)
1015 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3_HOT
; i
++) {
1016 struct acpi_device_power_state
*ps
= &device
->power
.states
[i
];
1017 acpi_power_resources_list_free(&ps
->resources
);
1021 static void acpi_device_release(struct device
*dev
)
1023 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
1025 acpi_free_properties(acpi_dev
);
1026 acpi_free_pnp_ids(&acpi_dev
->pnp
);
1027 acpi_free_power_resources_lists(acpi_dev
);
1031 static int acpi_bus_match(struct device
*dev
, struct device_driver
*drv
)
1033 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
1034 struct acpi_driver
*acpi_drv
= to_acpi_driver(drv
);
1036 return acpi_dev
->flags
.match_driver
1037 && !acpi_match_device_ids(acpi_dev
, acpi_drv
->ids
);
1040 static int acpi_device_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
1042 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
1045 if (list_empty(&acpi_dev
->pnp
.ids
))
1048 if (add_uevent_var(env
, "MODALIAS="))
1050 len
= create_modalias(acpi_dev
, &env
->buf
[env
->buflen
- 1],
1051 sizeof(env
->buf
) - env
->buflen
);
1058 static void acpi_device_notify(acpi_handle handle
, u32 event
, void *data
)
1060 struct acpi_device
*device
= data
;
1062 device
->driver
->ops
.notify(device
, event
);
1065 static void acpi_device_notify_fixed(void *data
)
1067 struct acpi_device
*device
= data
;
1069 /* Fixed hardware devices have no handles */
1070 acpi_device_notify(NULL
, ACPI_FIXED_HARDWARE_EVENT
, device
);
1073 static u32
acpi_device_fixed_event(void *data
)
1075 acpi_os_execute(OSL_NOTIFY_HANDLER
, acpi_device_notify_fixed
, data
);
1076 return ACPI_INTERRUPT_HANDLED
;
1079 static int acpi_device_install_notify_handler(struct acpi_device
*device
)
1083 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
1085 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
1086 acpi_device_fixed_event
,
1088 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
1090 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
1091 acpi_device_fixed_event
,
1094 status
= acpi_install_notify_handler(device
->handle
,
1099 if (ACPI_FAILURE(status
))
1104 static void acpi_device_remove_notify_handler(struct acpi_device
*device
)
1106 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
1107 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
1108 acpi_device_fixed_event
);
1109 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
1110 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
1111 acpi_device_fixed_event
);
1113 acpi_remove_notify_handler(device
->handle
, ACPI_DEVICE_NOTIFY
,
1114 acpi_device_notify
);
1117 static int acpi_device_probe(struct device
*dev
)
1119 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
1120 struct acpi_driver
*acpi_drv
= to_acpi_driver(dev
->driver
);
1123 if (acpi_dev
->handler
&& !acpi_is_pnp_device(acpi_dev
))
1126 if (!acpi_drv
->ops
.add
)
1129 ret
= acpi_drv
->ops
.add(acpi_dev
);
1133 acpi_dev
->driver
= acpi_drv
;
1134 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1135 "Driver [%s] successfully bound to device [%s]\n",
1136 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
1138 if (acpi_drv
->ops
.notify
) {
1139 ret
= acpi_device_install_notify_handler(acpi_dev
);
1141 if (acpi_drv
->ops
.remove
)
1142 acpi_drv
->ops
.remove(acpi_dev
);
1144 acpi_dev
->driver
= NULL
;
1145 acpi_dev
->driver_data
= NULL
;
1150 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found driver [%s] for device [%s]\n",
1151 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
1156 static int acpi_device_remove(struct device
* dev
)
1158 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
1159 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
1162 if (acpi_drv
->ops
.notify
)
1163 acpi_device_remove_notify_handler(acpi_dev
);
1164 if (acpi_drv
->ops
.remove
)
1165 acpi_drv
->ops
.remove(acpi_dev
);
1167 acpi_dev
->driver
= NULL
;
1168 acpi_dev
->driver_data
= NULL
;
1174 struct bus_type acpi_bus_type
= {
1176 .match
= acpi_bus_match
,
1177 .probe
= acpi_device_probe
,
1178 .remove
= acpi_device_remove
,
1179 .uevent
= acpi_device_uevent
,
1182 static void acpi_device_del(struct acpi_device
*device
)
1184 mutex_lock(&acpi_device_lock
);
1186 list_del(&device
->node
);
1188 list_del(&device
->wakeup_list
);
1189 mutex_unlock(&acpi_device_lock
);
1191 acpi_power_add_remove_device(device
, false);
1192 acpi_device_remove_files(device
);
1194 device
->remove(device
);
1196 device_del(&device
->dev
);
1199 static LIST_HEAD(acpi_device_del_list
);
1200 static DEFINE_MUTEX(acpi_device_del_lock
);
1202 static void acpi_device_del_work_fn(struct work_struct
*work_not_used
)
1205 struct acpi_device
*adev
;
1207 mutex_lock(&acpi_device_del_lock
);
1209 if (list_empty(&acpi_device_del_list
)) {
1210 mutex_unlock(&acpi_device_del_lock
);
1213 adev
= list_first_entry(&acpi_device_del_list
,
1214 struct acpi_device
, del_list
);
1215 list_del(&adev
->del_list
);
1217 mutex_unlock(&acpi_device_del_lock
);
1219 acpi_device_del(adev
);
1221 * Drop references to all power resources that might have been
1222 * used by the device.
1224 acpi_power_transition(adev
, ACPI_STATE_D3_COLD
);
1225 put_device(&adev
->dev
);
1230 * acpi_scan_drop_device - Drop an ACPI device object.
1231 * @handle: Handle of an ACPI namespace node, not used.
1232 * @context: Address of the ACPI device object to drop.
1234 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
1235 * namespace node the device object pointed to by @context is attached to.
1237 * The unregistration is carried out asynchronously to avoid running
1238 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
1239 * ensure the correct ordering (the device objects must be unregistered in the
1240 * same order in which the corresponding namespace nodes are deleted).
1242 static void acpi_scan_drop_device(acpi_handle handle
, void *context
)
1244 static DECLARE_WORK(work
, acpi_device_del_work_fn
);
1245 struct acpi_device
*adev
= context
;
1247 mutex_lock(&acpi_device_del_lock
);
1250 * Use the ACPI hotplug workqueue which is ordered, so this work item
1251 * won't run after any hotplug work items submitted subsequently. That
1252 * prevents attempts to register device objects identical to those being
1253 * deleted from happening concurrently (such attempts result from
1254 * hotplug events handled via the ACPI hotplug workqueue). It also will
1255 * run after all of the work items submitted previosuly, which helps
1256 * those work items to ensure that they are not accessing stale device
1259 if (list_empty(&acpi_device_del_list
))
1260 acpi_queue_hotplug_work(&work
);
1262 list_add_tail(&adev
->del_list
, &acpi_device_del_list
);
1263 /* Make acpi_ns_validate_handle() return NULL for this handle. */
1264 adev
->handle
= INVALID_ACPI_HANDLE
;
1266 mutex_unlock(&acpi_device_del_lock
);
1269 static int acpi_get_device_data(acpi_handle handle
, struct acpi_device
**device
,
1270 void (*callback
)(void *))
1277 status
= acpi_get_data_full(handle
, acpi_scan_drop_device
,
1278 (void **)device
, callback
);
1279 if (ACPI_FAILURE(status
) || !*device
) {
1280 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "No context for object [%p]\n",
1287 int acpi_bus_get_device(acpi_handle handle
, struct acpi_device
**device
)
1289 return acpi_get_device_data(handle
, device
, NULL
);
1291 EXPORT_SYMBOL(acpi_bus_get_device
);
1293 static void get_acpi_device(void *dev
)
1296 get_device(&((struct acpi_device
*)dev
)->dev
);
1299 struct acpi_device
*acpi_bus_get_acpi_device(acpi_handle handle
)
1301 struct acpi_device
*adev
= NULL
;
1303 acpi_get_device_data(handle
, &adev
, get_acpi_device
);
1307 void acpi_bus_put_acpi_device(struct acpi_device
*adev
)
1309 put_device(&adev
->dev
);
1312 int acpi_device_add(struct acpi_device
*device
,
1313 void (*release
)(struct device
*))
1316 struct acpi_device_bus_id
*acpi_device_bus_id
, *new_bus_id
;
1319 if (device
->handle
) {
1322 status
= acpi_attach_data(device
->handle
, acpi_scan_drop_device
,
1324 if (ACPI_FAILURE(status
)) {
1325 acpi_handle_err(device
->handle
,
1326 "Unable to attach device data\n");
1334 * Link this device to its parent and siblings.
1336 INIT_LIST_HEAD(&device
->children
);
1337 INIT_LIST_HEAD(&device
->node
);
1338 INIT_LIST_HEAD(&device
->wakeup_list
);
1339 INIT_LIST_HEAD(&device
->physical_node_list
);
1340 INIT_LIST_HEAD(&device
->del_list
);
1341 mutex_init(&device
->physical_node_lock
);
1343 new_bus_id
= kzalloc(sizeof(struct acpi_device_bus_id
), GFP_KERNEL
);
1345 pr_err(PREFIX
"Memory allocation error\n");
1350 mutex_lock(&acpi_device_lock
);
1352 * Find suitable bus_id and instance number in acpi_bus_id_list
1353 * If failed, create one and link it into acpi_bus_id_list
1355 list_for_each_entry(acpi_device_bus_id
, &acpi_bus_id_list
, node
) {
1356 if (!strcmp(acpi_device_bus_id
->bus_id
,
1357 acpi_device_hid(device
))) {
1358 acpi_device_bus_id
->instance_no
++;
1365 acpi_device_bus_id
= new_bus_id
;
1366 strcpy(acpi_device_bus_id
->bus_id
, acpi_device_hid(device
));
1367 acpi_device_bus_id
->instance_no
= 0;
1368 list_add_tail(&acpi_device_bus_id
->node
, &acpi_bus_id_list
);
1370 dev_set_name(&device
->dev
, "%s:%02x", acpi_device_bus_id
->bus_id
, acpi_device_bus_id
->instance_no
);
1373 list_add_tail(&device
->node
, &device
->parent
->children
);
1375 if (device
->wakeup
.flags
.valid
)
1376 list_add_tail(&device
->wakeup_list
, &acpi_wakeup_device_list
);
1377 mutex_unlock(&acpi_device_lock
);
1380 device
->dev
.parent
= &device
->parent
->dev
;
1381 device
->dev
.bus
= &acpi_bus_type
;
1382 device
->dev
.release
= release
;
1383 result
= device_add(&device
->dev
);
1385 dev_err(&device
->dev
, "Error registering device\n");
1389 result
= acpi_device_setup_files(device
);
1391 printk(KERN_ERR PREFIX
"Error creating sysfs interface for device %s\n",
1392 dev_name(&device
->dev
));
1397 mutex_lock(&acpi_device_lock
);
1399 list_del(&device
->node
);
1400 list_del(&device
->wakeup_list
);
1401 mutex_unlock(&acpi_device_lock
);
1404 acpi_detach_data(device
->handle
, acpi_scan_drop_device
);
1408 struct acpi_device
*acpi_get_next_child(struct device
*dev
,
1409 struct acpi_device
*child
)
1411 struct acpi_device
*adev
= ACPI_COMPANION(dev
);
1412 struct list_head
*head
, *next
;
1417 head
= &adev
->children
;
1418 if (list_empty(head
))
1422 return list_first_entry(head
, struct acpi_device
, node
);
1424 next
= child
->node
.next
;
1425 return next
== head
? NULL
: list_entry(next
, struct acpi_device
, node
);
1428 /* --------------------------------------------------------------------------
1430 -------------------------------------------------------------------------- */
1432 * acpi_bus_register_driver - register a driver with the ACPI bus
1433 * @driver: driver being registered
1435 * Registers a driver with the ACPI bus. Searches the namespace for all
1436 * devices that match the driver's criteria and binds. Returns zero for
1437 * success or a negative error status for failure.
1439 int acpi_bus_register_driver(struct acpi_driver
*driver
)
1445 driver
->drv
.name
= driver
->name
;
1446 driver
->drv
.bus
= &acpi_bus_type
;
1447 driver
->drv
.owner
= driver
->owner
;
1449 ret
= driver_register(&driver
->drv
);
1453 EXPORT_SYMBOL(acpi_bus_register_driver
);
1456 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1457 * @driver: driver to unregister
1459 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1460 * devices that match the driver's criteria and unbinds.
1462 void acpi_bus_unregister_driver(struct acpi_driver
*driver
)
1464 driver_unregister(&driver
->drv
);
1467 EXPORT_SYMBOL(acpi_bus_unregister_driver
);
1469 /* --------------------------------------------------------------------------
1471 -------------------------------------------------------------------------- */
1472 static struct acpi_device
*acpi_bus_get_parent(acpi_handle handle
)
1474 struct acpi_device
*device
= NULL
;
1478 * Fixed hardware devices do not appear in the namespace and do not
1479 * have handles, but we fabricate acpi_devices for them, so we have
1480 * to deal with them specially.
1486 status
= acpi_get_parent(handle
, &handle
);
1487 if (ACPI_FAILURE(status
))
1488 return status
== AE_NULL_ENTRY
? NULL
: acpi_root
;
1489 } while (acpi_bus_get_device(handle
, &device
));
1494 acpi_bus_get_ejd(acpi_handle handle
, acpi_handle
*ejd
)
1498 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
1499 union acpi_object
*obj
;
1501 status
= acpi_get_handle(handle
, "_EJD", &tmp
);
1502 if (ACPI_FAILURE(status
))
1505 status
= acpi_evaluate_object(handle
, "_EJD", NULL
, &buffer
);
1506 if (ACPI_SUCCESS(status
)) {
1507 obj
= buffer
.pointer
;
1508 status
= acpi_get_handle(ACPI_ROOT_OBJECT
, obj
->string
.pointer
,
1510 kfree(buffer
.pointer
);
1514 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd
);
1516 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle
,
1517 struct acpi_device_wakeup
*wakeup
)
1519 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1520 union acpi_object
*package
= NULL
;
1521 union acpi_object
*element
= NULL
;
1528 INIT_LIST_HEAD(&wakeup
->resources
);
1531 status
= acpi_evaluate_object(handle
, "_PRW", NULL
, &buffer
);
1532 if (ACPI_FAILURE(status
)) {
1533 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRW"));
1537 package
= (union acpi_object
*)buffer
.pointer
;
1539 if (!package
|| package
->package
.count
< 2)
1542 element
= &(package
->package
.elements
[0]);
1546 if (element
->type
== ACPI_TYPE_PACKAGE
) {
1547 if ((element
->package
.count
< 2) ||
1548 (element
->package
.elements
[0].type
!=
1549 ACPI_TYPE_LOCAL_REFERENCE
)
1550 || (element
->package
.elements
[1].type
!= ACPI_TYPE_INTEGER
))
1553 wakeup
->gpe_device
=
1554 element
->package
.elements
[0].reference
.handle
;
1555 wakeup
->gpe_number
=
1556 (u32
) element
->package
.elements
[1].integer
.value
;
1557 } else if (element
->type
== ACPI_TYPE_INTEGER
) {
1558 wakeup
->gpe_device
= NULL
;
1559 wakeup
->gpe_number
= element
->integer
.value
;
1564 element
= &(package
->package
.elements
[1]);
1565 if (element
->type
!= ACPI_TYPE_INTEGER
)
1568 wakeup
->sleep_state
= element
->integer
.value
;
1570 err
= acpi_extract_power_resources(package
, 2, &wakeup
->resources
);
1574 if (!list_empty(&wakeup
->resources
)) {
1577 err
= acpi_power_wakeup_list_init(&wakeup
->resources
,
1580 acpi_handle_warn(handle
, "Retrieving current states "
1581 "of wakeup power resources failed\n");
1582 acpi_power_resources_list_free(&wakeup
->resources
);
1585 if (sleep_state
< wakeup
->sleep_state
) {
1586 acpi_handle_warn(handle
, "Overriding _PRW sleep state "
1587 "(S%d) by S%d from power resources\n",
1588 (int)wakeup
->sleep_state
, sleep_state
);
1589 wakeup
->sleep_state
= sleep_state
;
1594 kfree(buffer
.pointer
);
1598 static void acpi_wakeup_gpe_init(struct acpi_device
*device
)
1600 struct acpi_device_id button_device_ids
[] = {
1606 struct acpi_device_wakeup
*wakeup
= &device
->wakeup
;
1608 acpi_event_status event_status
;
1610 wakeup
->flags
.notifier_present
= 0;
1612 /* Power button, Lid switch always enable wakeup */
1613 if (!acpi_match_device_ids(device
, button_device_ids
)) {
1614 wakeup
->flags
.run_wake
= 1;
1615 if (!acpi_match_device_ids(device
, &button_device_ids
[1])) {
1616 /* Do not use Lid/sleep button for S5 wakeup */
1617 if (wakeup
->sleep_state
== ACPI_STATE_S5
)
1618 wakeup
->sleep_state
= ACPI_STATE_S4
;
1620 acpi_mark_gpe_for_wake(wakeup
->gpe_device
, wakeup
->gpe_number
);
1621 device_set_wakeup_capable(&device
->dev
, true);
1625 acpi_setup_gpe_for_wake(device
->handle
, wakeup
->gpe_device
,
1626 wakeup
->gpe_number
);
1627 status
= acpi_get_gpe_status(wakeup
->gpe_device
, wakeup
->gpe_number
,
1629 if (ACPI_FAILURE(status
))
1632 wakeup
->flags
.run_wake
= !!(event_status
& ACPI_EVENT_FLAG_HAS_HANDLER
);
1635 static void acpi_bus_get_wakeup_device_flags(struct acpi_device
*device
)
1639 /* Presence of _PRW indicates wake capable */
1640 if (!acpi_has_method(device
->handle
, "_PRW"))
1643 err
= acpi_bus_extract_wakeup_device_power_package(device
->handle
,
1646 dev_err(&device
->dev
, "_PRW evaluation error: %d\n", err
);
1650 device
->wakeup
.flags
.valid
= 1;
1651 device
->wakeup
.prepare_count
= 0;
1652 acpi_wakeup_gpe_init(device
);
1653 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1654 * system for the ACPI device with the _PRW object.
1655 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1656 * So it is necessary to call _DSW object first. Only when it is not
1657 * present will the _PSW object used.
1659 err
= acpi_device_sleep_wake(device
, 0, 0, 0);
1661 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1662 "error in _DSW or _PSW evaluation\n"));
1665 static void acpi_bus_init_power_state(struct acpi_device
*device
, int state
)
1667 struct acpi_device_power_state
*ps
= &device
->power
.states
[state
];
1668 char pathname
[5] = { '_', 'P', 'R', '0' + state
, '\0' };
1669 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1672 INIT_LIST_HEAD(&ps
->resources
);
1674 /* Evaluate "_PRx" to get referenced power resources */
1675 status
= acpi_evaluate_object(device
->handle
, pathname
, NULL
, &buffer
);
1676 if (ACPI_SUCCESS(status
)) {
1677 union acpi_object
*package
= buffer
.pointer
;
1679 if (buffer
.length
&& package
1680 && package
->type
== ACPI_TYPE_PACKAGE
1681 && package
->package
.count
) {
1682 int err
= acpi_extract_power_resources(package
, 0,
1685 device
->power
.flags
.power_resources
= 1;
1687 ACPI_FREE(buffer
.pointer
);
1690 /* Evaluate "_PSx" to see if we can do explicit sets */
1692 if (acpi_has_method(device
->handle
, pathname
))
1693 ps
->flags
.explicit_set
= 1;
1696 * State is valid if there are means to put the device into it.
1697 * D3hot is only valid if _PR3 present.
1699 if (!list_empty(&ps
->resources
)
1700 || (ps
->flags
.explicit_set
&& state
< ACPI_STATE_D3_HOT
)) {
1701 ps
->flags
.valid
= 1;
1702 ps
->flags
.os_accessible
= 1;
1705 ps
->power
= -1; /* Unknown - driver assigned */
1706 ps
->latency
= -1; /* Unknown - driver assigned */
1709 static void acpi_bus_get_power_flags(struct acpi_device
*device
)
1713 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1714 if (!acpi_has_method(device
->handle
, "_PS0") &&
1715 !acpi_has_method(device
->handle
, "_PR0"))
1718 device
->flags
.power_manageable
= 1;
1721 * Power Management Flags
1723 if (acpi_has_method(device
->handle
, "_PSC"))
1724 device
->power
.flags
.explicit_get
= 1;
1726 if (acpi_has_method(device
->handle
, "_IRC"))
1727 device
->power
.flags
.inrush_current
= 1;
1729 if (acpi_has_method(device
->handle
, "_DSW"))
1730 device
->power
.flags
.dsw_present
= 1;
1733 * Enumerate supported power management states
1735 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3_HOT
; i
++)
1736 acpi_bus_init_power_state(device
, i
);
1738 INIT_LIST_HEAD(&device
->power
.states
[ACPI_STATE_D3_COLD
].resources
);
1740 /* Set defaults for D0 and D3 states (always valid) */
1741 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
= 1;
1742 device
->power
.states
[ACPI_STATE_D0
].power
= 100;
1743 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.valid
= 1;
1744 device
->power
.states
[ACPI_STATE_D3_COLD
].power
= 0;
1746 /* Set D3cold's explicit_set flag if _PS3 exists. */
1747 if (device
->power
.states
[ACPI_STATE_D3_HOT
].flags
.explicit_set
)
1748 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.explicit_set
= 1;
1750 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1751 if (device
->power
.states
[ACPI_STATE_D3_HOT
].flags
.explicit_set
||
1752 device
->power
.flags
.power_resources
)
1753 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.os_accessible
= 1;
1755 if (acpi_bus_init_power(device
))
1756 device
->flags
.power_manageable
= 0;
1759 static void acpi_bus_get_flags(struct acpi_device
*device
)
1761 /* Presence of _STA indicates 'dynamic_status' */
1762 if (acpi_has_method(device
->handle
, "_STA"))
1763 device
->flags
.dynamic_status
= 1;
1765 /* Presence of _RMV indicates 'removable' */
1766 if (acpi_has_method(device
->handle
, "_RMV"))
1767 device
->flags
.removable
= 1;
1769 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1770 if (acpi_has_method(device
->handle
, "_EJD") ||
1771 acpi_has_method(device
->handle
, "_EJ0"))
1772 device
->flags
.ejectable
= 1;
1775 static void acpi_device_get_busid(struct acpi_device
*device
)
1777 char bus_id
[5] = { '?', 0 };
1778 struct acpi_buffer buffer
= { sizeof(bus_id
), bus_id
};
1784 * The device's Bus ID is simply the object name.
1785 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1787 if (ACPI_IS_ROOT_DEVICE(device
)) {
1788 strcpy(device
->pnp
.bus_id
, "ACPI");
1792 switch (device
->device_type
) {
1793 case ACPI_BUS_TYPE_POWER_BUTTON
:
1794 strcpy(device
->pnp
.bus_id
, "PWRF");
1796 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1797 strcpy(device
->pnp
.bus_id
, "SLPF");
1800 acpi_get_name(device
->handle
, ACPI_SINGLE_NAME
, &buffer
);
1801 /* Clean up trailing underscores (if any) */
1802 for (i
= 3; i
> 1; i
--) {
1803 if (bus_id
[i
] == '_')
1808 strcpy(device
->pnp
.bus_id
, bus_id
);
1814 * acpi_ata_match - see if an acpi object is an ATA device
1816 * If an acpi object has one of the ACPI ATA methods defined,
1817 * then we can safely call it an ATA device.
1819 bool acpi_ata_match(acpi_handle handle
)
1821 return acpi_has_method(handle
, "_GTF") ||
1822 acpi_has_method(handle
, "_GTM") ||
1823 acpi_has_method(handle
, "_STM") ||
1824 acpi_has_method(handle
, "_SDD");
1828 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1830 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1831 * then we can safely call it an ejectable drive bay
1833 bool acpi_bay_match(acpi_handle handle
)
1835 acpi_handle phandle
;
1837 if (!acpi_has_method(handle
, "_EJ0"))
1839 if (acpi_ata_match(handle
))
1841 if (ACPI_FAILURE(acpi_get_parent(handle
, &phandle
)))
1844 return acpi_ata_match(phandle
);
1847 bool acpi_device_is_battery(struct acpi_device
*adev
)
1849 struct acpi_hardware_id
*hwid
;
1851 list_for_each_entry(hwid
, &adev
->pnp
.ids
, list
)
1852 if (!strcmp("PNP0C0A", hwid
->id
))
1858 static bool is_ejectable_bay(struct acpi_device
*adev
)
1860 acpi_handle handle
= adev
->handle
;
1862 if (acpi_has_method(handle
, "_EJ0") && acpi_device_is_battery(adev
))
1865 return acpi_bay_match(handle
);
1869 * acpi_dock_match - see if an acpi object has a _DCK method
1871 bool acpi_dock_match(acpi_handle handle
)
1873 return acpi_has_method(handle
, "_DCK");
1876 const char *acpi_device_hid(struct acpi_device
*device
)
1878 struct acpi_hardware_id
*hid
;
1880 if (list_empty(&device
->pnp
.ids
))
1883 hid
= list_first_entry(&device
->pnp
.ids
, struct acpi_hardware_id
, list
);
1886 EXPORT_SYMBOL(acpi_device_hid
);
1888 static void acpi_add_id(struct acpi_device_pnp
*pnp
, const char *dev_id
)
1890 struct acpi_hardware_id
*id
;
1892 id
= kmalloc(sizeof(*id
), GFP_KERNEL
);
1896 id
->id
= kstrdup(dev_id
, GFP_KERNEL
);
1902 list_add_tail(&id
->list
, &pnp
->ids
);
1903 pnp
->type
.hardware_id
= 1;
1907 * Old IBM workstations have a DSDT bug wherein the SMBus object
1908 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1909 * prefix. Work around this.
1911 static bool acpi_ibm_smbus_match(acpi_handle handle
)
1913 char node_name
[ACPI_PATH_SEGMENT_LENGTH
];
1914 struct acpi_buffer path
= { sizeof(node_name
), node_name
};
1916 if (!dmi_name_in_vendors("IBM"))
1919 /* Look for SMBS object */
1920 if (ACPI_FAILURE(acpi_get_name(handle
, ACPI_SINGLE_NAME
, &path
)) ||
1921 strcmp("SMBS", path
.pointer
))
1924 /* Does it have the necessary (but misnamed) methods? */
1925 if (acpi_has_method(handle
, "SBI") &&
1926 acpi_has_method(handle
, "SBR") &&
1927 acpi_has_method(handle
, "SBW"))
1933 static bool acpi_object_is_system_bus(acpi_handle handle
)
1937 if (ACPI_SUCCESS(acpi_get_handle(NULL
, "\\_SB", &tmp
)) &&
1940 if (ACPI_SUCCESS(acpi_get_handle(NULL
, "\\_TZ", &tmp
)) &&
1947 static void acpi_set_pnp_ids(acpi_handle handle
, struct acpi_device_pnp
*pnp
,
1951 struct acpi_device_info
*info
;
1952 struct acpi_pnp_device_id_list
*cid_list
;
1955 switch (device_type
) {
1956 case ACPI_BUS_TYPE_DEVICE
:
1957 if (handle
== ACPI_ROOT_OBJECT
) {
1958 acpi_add_id(pnp
, ACPI_SYSTEM_HID
);
1962 status
= acpi_get_object_info(handle
, &info
);
1963 if (ACPI_FAILURE(status
)) {
1964 pr_err(PREFIX
"%s: Error reading device info\n",
1969 if (info
->valid
& ACPI_VALID_HID
) {
1970 acpi_add_id(pnp
, info
->hardware_id
.string
);
1971 pnp
->type
.platform_id
= 1;
1973 if (info
->valid
& ACPI_VALID_CID
) {
1974 cid_list
= &info
->compatible_id_list
;
1975 for (i
= 0; i
< cid_list
->count
; i
++)
1976 acpi_add_id(pnp
, cid_list
->ids
[i
].string
);
1978 if (info
->valid
& ACPI_VALID_ADR
) {
1979 pnp
->bus_address
= info
->address
;
1980 pnp
->type
.bus_address
= 1;
1982 if (info
->valid
& ACPI_VALID_UID
)
1983 pnp
->unique_id
= kstrdup(info
->unique_id
.string
,
1989 * Some devices don't reliably have _HIDs & _CIDs, so add
1990 * synthetic HIDs to make sure drivers can find them.
1992 if (acpi_is_video_device(handle
))
1993 acpi_add_id(pnp
, ACPI_VIDEO_HID
);
1994 else if (acpi_bay_match(handle
))
1995 acpi_add_id(pnp
, ACPI_BAY_HID
);
1996 else if (acpi_dock_match(handle
))
1997 acpi_add_id(pnp
, ACPI_DOCK_HID
);
1998 else if (acpi_ibm_smbus_match(handle
))
1999 acpi_add_id(pnp
, ACPI_SMBUS_IBM_HID
);
2000 else if (list_empty(&pnp
->ids
) &&
2001 acpi_object_is_system_bus(handle
)) {
2002 /* \_SB, \_TZ, LNXSYBUS */
2003 acpi_add_id(pnp
, ACPI_BUS_HID
);
2004 strcpy(pnp
->device_name
, ACPI_BUS_DEVICE_NAME
);
2005 strcpy(pnp
->device_class
, ACPI_BUS_CLASS
);
2009 case ACPI_BUS_TYPE_POWER
:
2010 acpi_add_id(pnp
, ACPI_POWER_HID
);
2012 case ACPI_BUS_TYPE_PROCESSOR
:
2013 acpi_add_id(pnp
, ACPI_PROCESSOR_OBJECT_HID
);
2015 case ACPI_BUS_TYPE_THERMAL
:
2016 acpi_add_id(pnp
, ACPI_THERMAL_HID
);
2018 case ACPI_BUS_TYPE_POWER_BUTTON
:
2019 acpi_add_id(pnp
, ACPI_BUTTON_HID_POWERF
);
2021 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
2022 acpi_add_id(pnp
, ACPI_BUTTON_HID_SLEEPF
);
2027 void acpi_free_pnp_ids(struct acpi_device_pnp
*pnp
)
2029 struct acpi_hardware_id
*id
, *tmp
;
2031 list_for_each_entry_safe(id
, tmp
, &pnp
->ids
, list
) {
2035 kfree(pnp
->unique_id
);
2038 void acpi_init_device_object(struct acpi_device
*device
, acpi_handle handle
,
2039 int type
, unsigned long long sta
)
2041 INIT_LIST_HEAD(&device
->pnp
.ids
);
2042 device
->device_type
= type
;
2043 device
->handle
= handle
;
2044 device
->parent
= acpi_bus_get_parent(handle
);
2045 device
->fwnode
.type
= FWNODE_ACPI
;
2046 acpi_set_device_status(device
, sta
);
2047 acpi_device_get_busid(device
);
2048 acpi_set_pnp_ids(handle
, &device
->pnp
, type
);
2049 acpi_init_properties(device
);
2050 acpi_bus_get_flags(device
);
2051 device
->flags
.match_driver
= false;
2052 device
->flags
.initialized
= true;
2053 device
->flags
.visited
= false;
2054 device_initialize(&device
->dev
);
2055 dev_set_uevent_suppress(&device
->dev
, true);
2058 void acpi_device_add_finalize(struct acpi_device
*device
)
2060 dev_set_uevent_suppress(&device
->dev
, false);
2061 kobject_uevent(&device
->dev
.kobj
, KOBJ_ADD
);
2064 static int acpi_add_single_object(struct acpi_device
**child
,
2065 acpi_handle handle
, int type
,
2066 unsigned long long sta
)
2069 struct acpi_device
*device
;
2070 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
2072 device
= kzalloc(sizeof(struct acpi_device
), GFP_KERNEL
);
2074 printk(KERN_ERR PREFIX
"Memory allocation error\n");
2078 acpi_init_device_object(device
, handle
, type
, sta
);
2079 acpi_bus_get_power_flags(device
);
2080 acpi_bus_get_wakeup_device_flags(device
);
2082 result
= acpi_device_add(device
, acpi_device_release
);
2084 acpi_device_release(&device
->dev
);
2088 acpi_power_add_remove_device(device
, true);
2089 acpi_device_add_finalize(device
);
2090 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
2091 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Added %s [%s] parent %s\n",
2092 dev_name(&device
->dev
), (char *) buffer
.pointer
,
2093 device
->parent
? dev_name(&device
->parent
->dev
) : "(null)"));
2094 kfree(buffer
.pointer
);
2099 static int acpi_bus_type_and_status(acpi_handle handle
, int *type
,
2100 unsigned long long *sta
)
2103 acpi_object_type acpi_type
;
2105 status
= acpi_get_type(handle
, &acpi_type
);
2106 if (ACPI_FAILURE(status
))
2109 switch (acpi_type
) {
2110 case ACPI_TYPE_ANY
: /* for ACPI_ROOT_OBJECT */
2111 case ACPI_TYPE_DEVICE
:
2112 *type
= ACPI_BUS_TYPE_DEVICE
;
2113 status
= acpi_bus_get_status_handle(handle
, sta
);
2114 if (ACPI_FAILURE(status
))
2117 case ACPI_TYPE_PROCESSOR
:
2118 *type
= ACPI_BUS_TYPE_PROCESSOR
;
2119 status
= acpi_bus_get_status_handle(handle
, sta
);
2120 if (ACPI_FAILURE(status
))
2123 case ACPI_TYPE_THERMAL
:
2124 *type
= ACPI_BUS_TYPE_THERMAL
;
2125 *sta
= ACPI_STA_DEFAULT
;
2127 case ACPI_TYPE_POWER
:
2128 *type
= ACPI_BUS_TYPE_POWER
;
2129 *sta
= ACPI_STA_DEFAULT
;
2138 bool acpi_device_is_present(struct acpi_device
*adev
)
2140 if (adev
->status
.present
|| adev
->status
.functional
)
2143 adev
->flags
.initialized
= false;
2147 static bool acpi_scan_handler_matching(struct acpi_scan_handler
*handler
,
2149 const struct acpi_device_id
**matchid
)
2151 const struct acpi_device_id
*devid
;
2154 return handler
->match(idstr
, matchid
);
2156 for (devid
= handler
->ids
; devid
->id
[0]; devid
++)
2157 if (!strcmp((char *)devid
->id
, idstr
)) {
2167 static struct acpi_scan_handler
*acpi_scan_match_handler(char *idstr
,
2168 const struct acpi_device_id
**matchid
)
2170 struct acpi_scan_handler
*handler
;
2172 list_for_each_entry(handler
, &acpi_scan_handlers_list
, list_node
)
2173 if (acpi_scan_handler_matching(handler
, idstr
, matchid
))
2179 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile
*hotplug
, bool val
)
2181 if (!!hotplug
->enabled
== !!val
)
2184 mutex_lock(&acpi_scan_lock
);
2186 hotplug
->enabled
= val
;
2188 mutex_unlock(&acpi_scan_lock
);
2191 static void acpi_scan_init_hotplug(struct acpi_device
*adev
)
2193 struct acpi_hardware_id
*hwid
;
2195 if (acpi_dock_match(adev
->handle
) || is_ejectable_bay(adev
)) {
2196 acpi_dock_add(adev
);
2199 list_for_each_entry(hwid
, &adev
->pnp
.ids
, list
) {
2200 struct acpi_scan_handler
*handler
;
2202 handler
= acpi_scan_match_handler(hwid
->id
, NULL
);
2204 adev
->flags
.hotplug_notify
= true;
2210 static void acpi_device_dep_initialize(struct acpi_device
*adev
)
2212 struct acpi_dep_data
*dep
;
2213 struct acpi_handle_list dep_devices
;
2217 if (!acpi_has_method(adev
->handle
, "_DEP"))
2220 status
= acpi_evaluate_reference(adev
->handle
, "_DEP", NULL
,
2222 if (ACPI_FAILURE(status
)) {
2223 dev_dbg(&adev
->dev
, "Failed to evaluate _DEP.\n");
2227 for (i
= 0; i
< dep_devices
.count
; i
++) {
2228 struct acpi_device_info
*info
;
2231 status
= acpi_get_object_info(dep_devices
.handles
[i
], &info
);
2232 if (ACPI_FAILURE(status
)) {
2233 dev_dbg(&adev
->dev
, "Error reading _DEP device info\n");
2238 * Skip the dependency of Windows System Power
2239 * Management Controller
2241 skip
= info
->valid
& ACPI_VALID_HID
&&
2242 !strcmp(info
->hardware_id
.string
, "INT3396");
2249 dep
= kzalloc(sizeof(struct acpi_dep_data
), GFP_KERNEL
);
2253 dep
->master
= dep_devices
.handles
[i
];
2254 dep
->slave
= adev
->handle
;
2257 mutex_lock(&acpi_dep_list_lock
);
2258 list_add_tail(&dep
->node
, &acpi_dep_list
);
2259 mutex_unlock(&acpi_dep_list_lock
);
2263 static acpi_status
acpi_bus_check_add(acpi_handle handle
, u32 lvl_not_used
,
2264 void *not_used
, void **return_value
)
2266 struct acpi_device
*device
= NULL
;
2268 unsigned long long sta
;
2271 acpi_bus_get_device(handle
, &device
);
2275 result
= acpi_bus_type_and_status(handle
, &type
, &sta
);
2279 if (type
== ACPI_BUS_TYPE_POWER
) {
2280 acpi_add_power_resource(handle
);
2284 acpi_add_single_object(&device
, handle
, type
, sta
);
2286 return AE_CTRL_DEPTH
;
2288 acpi_scan_init_hotplug(device
);
2289 acpi_device_dep_initialize(device
);
2293 *return_value
= device
;
2298 static int acpi_check_spi_i2c_slave(struct acpi_resource
*ares
, void *data
)
2300 bool *is_spi_i2c_slave_p
= data
;
2302 if (ares
->type
!= ACPI_RESOURCE_TYPE_SERIAL_BUS
)
2306 * devices that are connected to UART still need to be enumerated to
2309 if (ares
->data
.common_serial_bus
.type
!= ACPI_RESOURCE_SERIAL_TYPE_UART
)
2310 *is_spi_i2c_slave_p
= true;
2312 /* no need to do more checking */
2316 static void acpi_default_enumeration(struct acpi_device
*device
)
2318 struct list_head resource_list
;
2319 bool is_spi_i2c_slave
= false;
2321 if (!device
->pnp
.type
.platform_id
|| device
->handler
)
2325 * Do not enemerate SPI/I2C slaves as they will be enuerated by their
2326 * respective parents.
2328 INIT_LIST_HEAD(&resource_list
);
2329 acpi_dev_get_resources(device
, &resource_list
, acpi_check_spi_i2c_slave
,
2331 acpi_dev_free_resource_list(&resource_list
);
2332 if (!is_spi_i2c_slave
)
2333 acpi_create_platform_device(device
);
2336 static int acpi_scan_attach_handler(struct acpi_device
*device
)
2338 struct acpi_hardware_id
*hwid
;
2341 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
) {
2342 const struct acpi_device_id
*devid
;
2343 struct acpi_scan_handler
*handler
;
2345 handler
= acpi_scan_match_handler(hwid
->id
, &devid
);
2347 if (!handler
->attach
) {
2348 device
->pnp
.type
.platform_id
= 0;
2351 device
->handler
= handler
;
2352 ret
= handler
->attach(device
, devid
);
2356 device
->handler
= NULL
;
2362 acpi_default_enumeration(device
);
2367 static void acpi_bus_attach(struct acpi_device
*device
)
2369 struct acpi_device
*child
;
2373 if (ACPI_SUCCESS(acpi_bus_get_ejd(device
->handle
, &ejd
)))
2374 register_dock_dependent_device(device
, ejd
);
2376 acpi_bus_get_status(device
);
2377 /* Skip devices that are not present. */
2378 if (!acpi_device_is_present(device
)) {
2379 device
->flags
.visited
= false;
2380 device
->flags
.power_manageable
= 0;
2383 if (device
->handler
)
2386 if (!device
->flags
.initialized
) {
2387 device
->flags
.power_manageable
=
2388 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
;
2389 if (acpi_bus_init_power(device
))
2390 device
->flags
.power_manageable
= 0;
2392 device
->flags
.initialized
= true;
2394 device
->flags
.visited
= false;
2395 ret
= acpi_scan_attach_handler(device
);
2399 device
->flags
.match_driver
= true;
2401 ret
= device_attach(&device
->dev
);
2405 device
->flags
.visited
= true;
2408 list_for_each_entry(child
, &device
->children
, node
)
2409 acpi_bus_attach(child
);
2411 if (device
->handler
&& device
->handler
->hotplug
.notify_online
)
2412 device
->handler
->hotplug
.notify_online(device
);
2415 void acpi_walk_dep_device_list(acpi_handle handle
)
2417 struct acpi_dep_data
*dep
, *tmp
;
2418 struct acpi_device
*adev
;
2420 mutex_lock(&acpi_dep_list_lock
);
2421 list_for_each_entry_safe(dep
, tmp
, &acpi_dep_list
, node
) {
2422 if (dep
->master
== handle
) {
2423 acpi_bus_get_device(dep
->slave
, &adev
);
2428 if (!adev
->dep_unmet
)
2429 acpi_bus_attach(adev
);
2430 list_del(&dep
->node
);
2434 mutex_unlock(&acpi_dep_list_lock
);
2436 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list
);
2439 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2440 * @handle: Root of the namespace scope to scan.
2442 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2445 * If no devices were found, -ENODEV is returned, but it does not mean that
2446 * there has been a real error. There just have been no suitable ACPI objects
2447 * in the table trunk from which the kernel could create a device and add an
2448 * appropriate driver.
2450 * Must be called under acpi_scan_lock.
2452 int acpi_bus_scan(acpi_handle handle
)
2454 void *device
= NULL
;
2456 if (ACPI_SUCCESS(acpi_bus_check_add(handle
, 0, NULL
, &device
)))
2457 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
2458 acpi_bus_check_add
, NULL
, NULL
, &device
);
2461 acpi_bus_attach(device
);
2466 EXPORT_SYMBOL(acpi_bus_scan
);
2469 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2470 * @adev: Root of the ACPI namespace scope to walk.
2472 * Must be called under acpi_scan_lock.
2474 void acpi_bus_trim(struct acpi_device
*adev
)
2476 struct acpi_scan_handler
*handler
= adev
->handler
;
2477 struct acpi_device
*child
;
2479 list_for_each_entry_reverse(child
, &adev
->children
, node
)
2480 acpi_bus_trim(child
);
2482 adev
->flags
.match_driver
= false;
2484 if (handler
->detach
)
2485 handler
->detach(adev
);
2487 adev
->handler
= NULL
;
2489 device_release_driver(&adev
->dev
);
2492 * Most likely, the device is going away, so put it into D3cold before
2495 acpi_device_set_power(adev
, ACPI_STATE_D3_COLD
);
2496 adev
->flags
.initialized
= false;
2497 adev
->flags
.visited
= false;
2499 EXPORT_SYMBOL_GPL(acpi_bus_trim
);
2501 static int acpi_bus_scan_fixed(void)
2506 * Enumerate all fixed-feature devices.
2508 if (!(acpi_gbl_FADT
.flags
& ACPI_FADT_POWER_BUTTON
)) {
2509 struct acpi_device
*device
= NULL
;
2511 result
= acpi_add_single_object(&device
, NULL
,
2512 ACPI_BUS_TYPE_POWER_BUTTON
,
2517 device
->flags
.match_driver
= true;
2518 result
= device_attach(&device
->dev
);
2522 device_init_wakeup(&device
->dev
, true);
2525 if (!(acpi_gbl_FADT
.flags
& ACPI_FADT_SLEEP_BUTTON
)) {
2526 struct acpi_device
*device
= NULL
;
2528 result
= acpi_add_single_object(&device
, NULL
,
2529 ACPI_BUS_TYPE_SLEEP_BUTTON
,
2534 device
->flags
.match_driver
= true;
2535 result
= device_attach(&device
->dev
);
2538 return result
< 0 ? result
: 0;
2541 int __init
acpi_scan_init(void)
2545 result
= bus_register(&acpi_bus_type
);
2547 /* We don't want to quit even if we failed to add suspend/resume */
2548 printk(KERN_ERR PREFIX
"Could not register bus type\n");
2551 acpi_pci_root_init();
2552 acpi_pci_link_init();
2553 acpi_processor_init();
2556 acpi_cmos_rtc_init();
2557 acpi_container_init();
2558 acpi_memory_hotplug_init();
2560 acpi_int340x_thermal_init();
2562 mutex_lock(&acpi_scan_lock
);
2564 * Enumerate devices in the ACPI namespace.
2566 result
= acpi_bus_scan(ACPI_ROOT_OBJECT
);
2570 result
= acpi_bus_get_device(ACPI_ROOT_OBJECT
, &acpi_root
);
2574 /* Fixed feature devices do not exist on HW-reduced platform */
2575 if (!acpi_gbl_reduced_hardware
) {
2576 result
= acpi_bus_scan_fixed();
2578 acpi_detach_data(acpi_root
->handle
,
2579 acpi_scan_drop_device
);
2580 acpi_device_del(acpi_root
);
2581 put_device(&acpi_root
->dev
);
2586 acpi_update_all_gpes();
2589 mutex_unlock(&acpi_scan_lock
);