2 * scan.c - support for transforming the ACPI namespace into individual objects
5 #include <linux/module.h>
6 #include <linux/init.h>
7 #include <linux/slab.h>
8 #include <linux/kernel.h>
9 #include <linux/acpi.h>
10 #include <linux/signal.h>
11 #include <linux/kthread.h>
12 #include <linux/dmi.h>
13 #include <linux/nls.h>
14 #include <linux/dma-mapping.h>
16 #include <asm/pgtable.h>
20 #define _COMPONENT ACPI_BUS_COMPONENT
21 ACPI_MODULE_NAME("scan");
22 extern struct acpi_device
*acpi_root
;
24 #define ACPI_BUS_CLASS "system_bus"
25 #define ACPI_BUS_HID "LNXSYBUS"
26 #define ACPI_BUS_DEVICE_NAME "System Bus"
28 #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
30 #define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page)
33 * If set, devices will be hot-removed even if they cannot be put offline
34 * gracefully (from the kernel's standpoint).
36 bool acpi_force_hot_remove
;
38 static const char *dummy_hid
= "device";
40 static LIST_HEAD(acpi_dep_list
);
41 static DEFINE_MUTEX(acpi_dep_list_lock
);
42 static LIST_HEAD(acpi_bus_id_list
);
43 static DEFINE_MUTEX(acpi_scan_lock
);
44 static LIST_HEAD(acpi_scan_handlers_list
);
45 DEFINE_MUTEX(acpi_device_lock
);
46 LIST_HEAD(acpi_wakeup_device_list
);
47 static DEFINE_MUTEX(acpi_hp_context_lock
);
49 struct acpi_dep_data
{
50 struct list_head node
;
55 struct acpi_device_bus_id
{
57 unsigned int instance_no
;
58 struct list_head node
;
61 void acpi_scan_lock_acquire(void)
63 mutex_lock(&acpi_scan_lock
);
65 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire
);
67 void acpi_scan_lock_release(void)
69 mutex_unlock(&acpi_scan_lock
);
71 EXPORT_SYMBOL_GPL(acpi_scan_lock_release
);
73 void acpi_lock_hp_context(void)
75 mutex_lock(&acpi_hp_context_lock
);
78 void acpi_unlock_hp_context(void)
80 mutex_unlock(&acpi_hp_context_lock
);
83 void acpi_initialize_hp_context(struct acpi_device
*adev
,
84 struct acpi_hotplug_context
*hp
,
85 int (*notify
)(struct acpi_device
*, u32
),
86 void (*uevent
)(struct acpi_device
*, u32
))
88 acpi_lock_hp_context();
91 acpi_set_hp_context(adev
, hp
);
92 acpi_unlock_hp_context();
94 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context
);
96 int acpi_scan_add_handler(struct acpi_scan_handler
*handler
)
101 list_add_tail(&handler
->list_node
, &acpi_scan_handlers_list
);
105 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler
*handler
,
106 const char *hotplug_profile_name
)
110 error
= acpi_scan_add_handler(handler
);
114 acpi_sysfs_add_hotplug_profile(&handler
->hotplug
, hotplug_profile_name
);
119 * create_pnp_modalias - Create hid/cid(s) string for modalias and uevent
120 * @acpi_dev: ACPI device object.
121 * @modalias: Buffer to print into.
122 * @size: Size of the buffer.
124 * Creates hid/cid(s) string needed for modalias and uevent
125 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
126 * char *modalias: "acpi:IBM0001:ACPI0001"
127 * Return: 0: no _HID and no _CID
128 * -EINVAL: output error
129 * -ENOMEM: output is truncated
131 static int create_pnp_modalias(struct acpi_device
*acpi_dev
, char *modalias
,
136 struct acpi_hardware_id
*id
;
139 * Since we skip ACPI_DT_NAMESPACE_HID from the modalias below, 0 should
140 * be returned if ACPI_DT_NAMESPACE_HID is the only ACPI/PNP ID in the
144 list_for_each_entry(id
, &acpi_dev
->pnp
.ids
, list
)
145 if (strcmp(id
->id
, ACPI_DT_NAMESPACE_HID
))
151 len
= snprintf(modalias
, size
, "acpi:");
157 list_for_each_entry(id
, &acpi_dev
->pnp
.ids
, list
) {
158 if (!strcmp(id
->id
, ACPI_DT_NAMESPACE_HID
))
161 count
= snprintf(&modalias
[len
], size
, "%s:", id
->id
);
171 modalias
[len
] = '\0';
176 * create_of_modalias - Creates DT compatible string for modalias and uevent
177 * @acpi_dev: ACPI device object.
178 * @modalias: Buffer to print into.
179 * @size: Size of the buffer.
181 * Expose DT compatible modalias as of:NnameTCcompatible. This function should
182 * only be called for devices having ACPI_DT_NAMESPACE_HID in their list of
185 static int create_of_modalias(struct acpi_device
*acpi_dev
, char *modalias
,
188 struct acpi_buffer buf
= { ACPI_ALLOCATE_BUFFER
};
189 const union acpi_object
*of_compatible
, *obj
;
194 acpi_get_name(acpi_dev
->handle
, ACPI_SINGLE_NAME
, &buf
);
195 /* DT strings are all in lower case */
196 for (c
= buf
.pointer
; *c
!= '\0'; c
++)
199 len
= snprintf(modalias
, size
, "of:N%sT", (char *)buf
.pointer
);
200 ACPI_FREE(buf
.pointer
);
205 of_compatible
= acpi_dev
->data
.of_compatible
;
206 if (of_compatible
->type
== ACPI_TYPE_PACKAGE
) {
207 nval
= of_compatible
->package
.count
;
208 obj
= of_compatible
->package
.elements
;
209 } else { /* Must be ACPI_TYPE_STRING. */
213 for (i
= 0; i
< nval
; i
++, obj
++) {
214 count
= snprintf(&modalias
[len
], size
, "C%s",
215 obj
->string
.pointer
);
225 modalias
[len
] = '\0';
230 * acpi_companion_match() - Can we match via ACPI companion device
231 * @dev: Device in question
233 * Check if the given device has an ACPI companion and if that companion has
234 * a valid list of PNP IDs, and if the device is the first (primary) physical
235 * device associated with it. Return the companion pointer if that's the case
238 * If multiple physical devices are attached to a single ACPI companion, we need
239 * to be careful. The usage scenario for this kind of relationship is that all
240 * of the physical devices in question use resources provided by the ACPI
241 * companion. A typical case is an MFD device where all the sub-devices share
242 * the parent's ACPI companion. In such cases we can only allow the primary
243 * (first) physical device to be matched with the help of the companion's PNP
246 * Additional physical devices sharing the ACPI companion can still use
247 * resources available from it but they will be matched normally using functions
248 * provided by their bus types (and analogously for their modalias).
250 static struct acpi_device
*acpi_companion_match(const struct device
*dev
)
252 struct acpi_device
*adev
;
253 struct mutex
*physical_node_lock
;
255 adev
= ACPI_COMPANION(dev
);
259 if (list_empty(&adev
->pnp
.ids
))
262 physical_node_lock
= &adev
->physical_node_lock
;
263 mutex_lock(physical_node_lock
);
264 if (list_empty(&adev
->physical_node_list
)) {
267 const struct acpi_device_physical_node
*node
;
269 node
= list_first_entry(&adev
->physical_node_list
,
270 struct acpi_device_physical_node
, node
);
271 if (node
->dev
!= dev
)
274 mutex_unlock(physical_node_lock
);
279 static int __acpi_device_uevent_modalias(struct acpi_device
*adev
,
280 struct kobj_uevent_env
*env
)
287 if (list_empty(&adev
->pnp
.ids
))
290 if (add_uevent_var(env
, "MODALIAS="))
293 len
= create_pnp_modalias(adev
, &env
->buf
[env
->buflen
- 1],
294 sizeof(env
->buf
) - env
->buflen
);
299 if (!adev
->data
.of_compatible
)
302 if (len
> 0 && add_uevent_var(env
, "MODALIAS="))
305 len
= create_of_modalias(adev
, &env
->buf
[env
->buflen
- 1],
306 sizeof(env
->buf
) - env
->buflen
);
316 * Creates uevent modalias field for ACPI enumerated devices.
317 * Because the other buses does not support ACPI HIDs & CIDs.
318 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
319 * "acpi:IBM0001:ACPI0001"
321 int acpi_device_uevent_modalias(struct device
*dev
, struct kobj_uevent_env
*env
)
323 return __acpi_device_uevent_modalias(acpi_companion_match(dev
), env
);
325 EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias
);
327 static int __acpi_device_modalias(struct acpi_device
*adev
, char *buf
, int size
)
334 if (list_empty(&adev
->pnp
.ids
))
337 len
= create_pnp_modalias(adev
, buf
, size
- 1);
340 } else if (len
> 0) {
344 if (!adev
->data
.of_compatible
)
347 count
= create_of_modalias(adev
, buf
+ len
, size
- 1);
350 } else if (count
> 0) {
359 * Creates modalias sysfs attribute for ACPI enumerated devices.
360 * Because the other buses does not support ACPI HIDs & CIDs.
361 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
362 * "acpi:IBM0001:ACPI0001"
364 int acpi_device_modalias(struct device
*dev
, char *buf
, int size
)
366 return __acpi_device_modalias(acpi_companion_match(dev
), buf
, size
);
368 EXPORT_SYMBOL_GPL(acpi_device_modalias
);
371 acpi_device_modalias_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
372 return __acpi_device_modalias(to_acpi_device(dev
), buf
, 1024);
374 static DEVICE_ATTR(modalias
, 0444, acpi_device_modalias_show
, NULL
);
376 bool acpi_scan_is_offline(struct acpi_device
*adev
, bool uevent
)
378 struct acpi_device_physical_node
*pn
;
382 * acpi_container_offline() calls this for all of the container's
383 * children under the container's physical_node_lock lock.
385 mutex_lock_nested(&adev
->physical_node_lock
, SINGLE_DEPTH_NESTING
);
387 list_for_each_entry(pn
, &adev
->physical_node_list
, node
)
388 if (device_supports_offline(pn
->dev
) && !pn
->dev
->offline
) {
390 kobject_uevent(&pn
->dev
->kobj
, KOBJ_CHANGE
);
396 mutex_unlock(&adev
->physical_node_lock
);
400 static acpi_status
acpi_bus_offline(acpi_handle handle
, u32 lvl
, void *data
,
403 struct acpi_device
*device
= NULL
;
404 struct acpi_device_physical_node
*pn
;
405 bool second_pass
= (bool)data
;
406 acpi_status status
= AE_OK
;
408 if (acpi_bus_get_device(handle
, &device
))
411 if (device
->handler
&& !device
->handler
->hotplug
.enabled
) {
412 *ret_p
= &device
->dev
;
416 mutex_lock(&device
->physical_node_lock
);
418 list_for_each_entry(pn
, &device
->physical_node_list
, node
) {
422 /* Skip devices offlined by the first pass. */
426 pn
->put_online
= false;
428 ret
= device_offline(pn
->dev
);
429 if (acpi_force_hot_remove
)
433 pn
->put_online
= !ret
;
443 mutex_unlock(&device
->physical_node_lock
);
448 static acpi_status
acpi_bus_online(acpi_handle handle
, u32 lvl
, void *data
,
451 struct acpi_device
*device
= NULL
;
452 struct acpi_device_physical_node
*pn
;
454 if (acpi_bus_get_device(handle
, &device
))
457 mutex_lock(&device
->physical_node_lock
);
459 list_for_each_entry(pn
, &device
->physical_node_list
, node
)
460 if (pn
->put_online
) {
461 device_online(pn
->dev
);
462 pn
->put_online
= false;
465 mutex_unlock(&device
->physical_node_lock
);
470 static int acpi_scan_try_to_offline(struct acpi_device
*device
)
472 acpi_handle handle
= device
->handle
;
473 struct device
*errdev
= NULL
;
477 * Carry out two passes here and ignore errors in the first pass,
478 * because if the devices in question are memory blocks and
479 * CONFIG_MEMCG is set, one of the blocks may hold data structures
480 * that the other blocks depend on, but it is not known in advance which
483 * If the first pass is successful, the second one isn't needed, though.
485 status
= acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
486 NULL
, acpi_bus_offline
, (void *)false,
488 if (status
== AE_SUPPORT
) {
489 dev_warn(errdev
, "Offline disabled.\n");
490 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
491 acpi_bus_online
, NULL
, NULL
, NULL
);
494 acpi_bus_offline(handle
, 0, (void *)false, (void **)&errdev
);
497 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
498 NULL
, acpi_bus_offline
, (void *)true,
500 if (!errdev
|| acpi_force_hot_remove
)
501 acpi_bus_offline(handle
, 0, (void *)true,
504 if (errdev
&& !acpi_force_hot_remove
) {
505 dev_warn(errdev
, "Offline failed.\n");
506 acpi_bus_online(handle
, 0, NULL
, NULL
);
507 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
,
508 ACPI_UINT32_MAX
, acpi_bus_online
,
516 static int acpi_scan_hot_remove(struct acpi_device
*device
)
518 acpi_handle handle
= device
->handle
;
519 unsigned long long sta
;
522 if (device
->handler
&& device
->handler
->hotplug
.demand_offline
523 && !acpi_force_hot_remove
) {
524 if (!acpi_scan_is_offline(device
, true))
527 int error
= acpi_scan_try_to_offline(device
);
532 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
533 "Hot-removing device %s...\n", dev_name(&device
->dev
)));
535 acpi_bus_trim(device
);
537 acpi_evaluate_lck(handle
, 0);
541 status
= acpi_evaluate_ej0(handle
);
542 if (status
== AE_NOT_FOUND
)
544 else if (ACPI_FAILURE(status
))
548 * Verify if eject was indeed successful. If not, log an error
549 * message. No need to call _OST since _EJ0 call was made OK.
551 status
= acpi_evaluate_integer(handle
, "_STA", NULL
, &sta
);
552 if (ACPI_FAILURE(status
)) {
553 acpi_handle_warn(handle
,
554 "Status check after eject failed (0x%x)\n", status
);
555 } else if (sta
& ACPI_STA_DEVICE_ENABLED
) {
556 acpi_handle_warn(handle
,
557 "Eject incomplete - status 0x%llx\n", sta
);
563 static int acpi_scan_device_not_present(struct acpi_device
*adev
)
565 if (!acpi_device_enumerated(adev
)) {
566 dev_warn(&adev
->dev
, "Still not present\n");
573 static int acpi_scan_device_check(struct acpi_device
*adev
)
577 acpi_bus_get_status(adev
);
578 if (adev
->status
.present
|| adev
->status
.functional
) {
580 * This function is only called for device objects for which
581 * matching scan handlers exist. The only situation in which
582 * the scan handler is not attached to this device object yet
583 * is when the device has just appeared (either it wasn't
584 * present at all before or it was removed and then added
588 dev_warn(&adev
->dev
, "Already enumerated\n");
591 error
= acpi_bus_scan(adev
->handle
);
593 dev_warn(&adev
->dev
, "Namespace scan failure\n");
596 if (!adev
->handler
) {
597 dev_warn(&adev
->dev
, "Enumeration failure\n");
601 error
= acpi_scan_device_not_present(adev
);
606 static int acpi_scan_bus_check(struct acpi_device
*adev
)
608 struct acpi_scan_handler
*handler
= adev
->handler
;
609 struct acpi_device
*child
;
612 acpi_bus_get_status(adev
);
613 if (!(adev
->status
.present
|| adev
->status
.functional
)) {
614 acpi_scan_device_not_present(adev
);
617 if (handler
&& handler
->hotplug
.scan_dependent
)
618 return handler
->hotplug
.scan_dependent(adev
);
620 error
= acpi_bus_scan(adev
->handle
);
622 dev_warn(&adev
->dev
, "Namespace scan failure\n");
625 list_for_each_entry(child
, &adev
->children
, node
) {
626 error
= acpi_scan_bus_check(child
);
633 static int acpi_generic_hotplug_event(struct acpi_device
*adev
, u32 type
)
636 case ACPI_NOTIFY_BUS_CHECK
:
637 return acpi_scan_bus_check(adev
);
638 case ACPI_NOTIFY_DEVICE_CHECK
:
639 return acpi_scan_device_check(adev
);
640 case ACPI_NOTIFY_EJECT_REQUEST
:
641 case ACPI_OST_EC_OSPM_EJECT
:
642 if (adev
->handler
&& !adev
->handler
->hotplug
.enabled
) {
643 dev_info(&adev
->dev
, "Eject disabled\n");
646 acpi_evaluate_ost(adev
->handle
, ACPI_NOTIFY_EJECT_REQUEST
,
647 ACPI_OST_SC_EJECT_IN_PROGRESS
, NULL
);
648 return acpi_scan_hot_remove(adev
);
653 void acpi_device_hotplug(struct acpi_device
*adev
, u32 src
)
655 u32 ost_code
= ACPI_OST_SC_NON_SPECIFIC_FAILURE
;
658 lock_device_hotplug();
659 mutex_lock(&acpi_scan_lock
);
662 * The device object's ACPI handle cannot become invalid as long as we
663 * are holding acpi_scan_lock, but it might have become invalid before
664 * that lock was acquired.
666 if (adev
->handle
== INVALID_ACPI_HANDLE
)
669 if (adev
->flags
.is_dock_station
) {
670 error
= dock_notify(adev
, src
);
671 } else if (adev
->flags
.hotplug_notify
) {
672 error
= acpi_generic_hotplug_event(adev
, src
);
673 if (error
== -EPERM
) {
674 ost_code
= ACPI_OST_SC_EJECT_NOT_SUPPORTED
;
678 int (*notify
)(struct acpi_device
*, u32
);
680 acpi_lock_hp_context();
681 notify
= adev
->hp
? adev
->hp
->notify
: NULL
;
682 acpi_unlock_hp_context();
684 * There may be additional notify handlers for device objects
685 * without the .event() callback, so ignore them here.
688 error
= notify(adev
, src
);
693 ost_code
= ACPI_OST_SC_SUCCESS
;
696 acpi_evaluate_ost(adev
->handle
, src
, ost_code
, NULL
);
699 acpi_bus_put_acpi_device(adev
);
700 mutex_unlock(&acpi_scan_lock
);
701 unlock_device_hotplug();
704 static ssize_t
real_power_state_show(struct device
*dev
,
705 struct device_attribute
*attr
, char *buf
)
707 struct acpi_device
*adev
= to_acpi_device(dev
);
711 ret
= acpi_device_get_power(adev
, &state
);
715 return sprintf(buf
, "%s\n", acpi_power_state_string(state
));
718 static DEVICE_ATTR(real_power_state
, 0444, real_power_state_show
, NULL
);
720 static ssize_t
power_state_show(struct device
*dev
,
721 struct device_attribute
*attr
, char *buf
)
723 struct acpi_device
*adev
= to_acpi_device(dev
);
725 return sprintf(buf
, "%s\n", acpi_power_state_string(adev
->power
.state
));
728 static DEVICE_ATTR(power_state
, 0444, power_state_show
, NULL
);
731 acpi_eject_store(struct device
*d
, struct device_attribute
*attr
,
732 const char *buf
, size_t count
)
734 struct acpi_device
*acpi_device
= to_acpi_device(d
);
735 acpi_object_type not_used
;
738 if (!count
|| buf
[0] != '1')
741 if ((!acpi_device
->handler
|| !acpi_device
->handler
->hotplug
.enabled
)
742 && !acpi_device
->driver
)
745 status
= acpi_get_type(acpi_device
->handle
, ¬_used
);
746 if (ACPI_FAILURE(status
) || !acpi_device
->flags
.ejectable
)
749 get_device(&acpi_device
->dev
);
750 status
= acpi_hotplug_schedule(acpi_device
, ACPI_OST_EC_OSPM_EJECT
);
751 if (ACPI_SUCCESS(status
))
754 put_device(&acpi_device
->dev
);
755 acpi_evaluate_ost(acpi_device
->handle
, ACPI_OST_EC_OSPM_EJECT
,
756 ACPI_OST_SC_NON_SPECIFIC_FAILURE
, NULL
);
757 return status
== AE_NO_MEMORY
? -ENOMEM
: -EAGAIN
;
760 static DEVICE_ATTR(eject
, 0200, NULL
, acpi_eject_store
);
763 acpi_device_hid_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
764 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
766 return sprintf(buf
, "%s\n", acpi_device_hid(acpi_dev
));
768 static DEVICE_ATTR(hid
, 0444, acpi_device_hid_show
, NULL
);
770 static ssize_t
acpi_device_uid_show(struct device
*dev
,
771 struct device_attribute
*attr
, char *buf
)
773 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
775 return sprintf(buf
, "%s\n", acpi_dev
->pnp
.unique_id
);
777 static DEVICE_ATTR(uid
, 0444, acpi_device_uid_show
, NULL
);
779 static ssize_t
acpi_device_adr_show(struct device
*dev
,
780 struct device_attribute
*attr
, char *buf
)
782 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
784 return sprintf(buf
, "0x%08x\n",
785 (unsigned int)(acpi_dev
->pnp
.bus_address
));
787 static DEVICE_ATTR(adr
, 0444, acpi_device_adr_show
, NULL
);
790 acpi_device_path_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
791 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
792 struct acpi_buffer path
= {ACPI_ALLOCATE_BUFFER
, NULL
};
795 result
= acpi_get_name(acpi_dev
->handle
, ACPI_FULL_PATHNAME
, &path
);
799 result
= sprintf(buf
, "%s\n", (char*)path
.pointer
);
804 static DEVICE_ATTR(path
, 0444, acpi_device_path_show
, NULL
);
806 /* sysfs file that shows description text from the ACPI _STR method */
807 static ssize_t
description_show(struct device
*dev
,
808 struct device_attribute
*attr
,
810 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
813 if (acpi_dev
->pnp
.str_obj
== NULL
)
817 * The _STR object contains a Unicode identifier for a device.
818 * We need to convert to utf-8 so it can be displayed.
820 result
= utf16s_to_utf8s(
821 (wchar_t *)acpi_dev
->pnp
.str_obj
->buffer
.pointer
,
822 acpi_dev
->pnp
.str_obj
->buffer
.length
,
823 UTF16_LITTLE_ENDIAN
, buf
,
826 buf
[result
++] = '\n';
830 static DEVICE_ATTR(description
, 0444, description_show
, NULL
);
833 acpi_device_sun_show(struct device
*dev
, struct device_attribute
*attr
,
835 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
837 unsigned long long sun
;
839 status
= acpi_evaluate_integer(acpi_dev
->handle
, "_SUN", NULL
, &sun
);
840 if (ACPI_FAILURE(status
))
843 return sprintf(buf
, "%llu\n", sun
);
845 static DEVICE_ATTR(sun
, 0444, acpi_device_sun_show
, NULL
);
847 static ssize_t
status_show(struct device
*dev
, struct device_attribute
*attr
,
849 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
851 unsigned long long sta
;
853 status
= acpi_evaluate_integer(acpi_dev
->handle
, "_STA", NULL
, &sta
);
854 if (ACPI_FAILURE(status
))
857 return sprintf(buf
, "%llu\n", sta
);
859 static DEVICE_ATTR_RO(status
);
861 static int acpi_device_setup_files(struct acpi_device
*dev
)
863 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
868 * Devices gotten from FADT don't have a "path" attribute
871 result
= device_create_file(&dev
->dev
, &dev_attr_path
);
876 if (!list_empty(&dev
->pnp
.ids
)) {
877 result
= device_create_file(&dev
->dev
, &dev_attr_hid
);
881 result
= device_create_file(&dev
->dev
, &dev_attr_modalias
);
887 * If device has _STR, 'description' file is created
889 if (acpi_has_method(dev
->handle
, "_STR")) {
890 status
= acpi_evaluate_object(dev
->handle
, "_STR",
892 if (ACPI_FAILURE(status
))
893 buffer
.pointer
= NULL
;
894 dev
->pnp
.str_obj
= buffer
.pointer
;
895 result
= device_create_file(&dev
->dev
, &dev_attr_description
);
900 if (dev
->pnp
.type
.bus_address
)
901 result
= device_create_file(&dev
->dev
, &dev_attr_adr
);
902 if (dev
->pnp
.unique_id
)
903 result
= device_create_file(&dev
->dev
, &dev_attr_uid
);
905 if (acpi_has_method(dev
->handle
, "_SUN")) {
906 result
= device_create_file(&dev
->dev
, &dev_attr_sun
);
911 if (acpi_has_method(dev
->handle
, "_STA")) {
912 result
= device_create_file(&dev
->dev
, &dev_attr_status
);
918 * If device has _EJ0, 'eject' file is created that is used to trigger
919 * hot-removal function from userland.
921 if (acpi_has_method(dev
->handle
, "_EJ0")) {
922 result
= device_create_file(&dev
->dev
, &dev_attr_eject
);
927 if (dev
->flags
.power_manageable
) {
928 result
= device_create_file(&dev
->dev
, &dev_attr_power_state
);
932 if (dev
->power
.flags
.power_resources
)
933 result
= device_create_file(&dev
->dev
,
934 &dev_attr_real_power_state
);
941 static void acpi_device_remove_files(struct acpi_device
*dev
)
943 if (dev
->flags
.power_manageable
) {
944 device_remove_file(&dev
->dev
, &dev_attr_power_state
);
945 if (dev
->power
.flags
.power_resources
)
946 device_remove_file(&dev
->dev
,
947 &dev_attr_real_power_state
);
951 * If device has _STR, remove 'description' file
953 if (acpi_has_method(dev
->handle
, "_STR")) {
954 kfree(dev
->pnp
.str_obj
);
955 device_remove_file(&dev
->dev
, &dev_attr_description
);
958 * If device has _EJ0, remove 'eject' file.
960 if (acpi_has_method(dev
->handle
, "_EJ0"))
961 device_remove_file(&dev
->dev
, &dev_attr_eject
);
963 if (acpi_has_method(dev
->handle
, "_SUN"))
964 device_remove_file(&dev
->dev
, &dev_attr_sun
);
966 if (dev
->pnp
.unique_id
)
967 device_remove_file(&dev
->dev
, &dev_attr_uid
);
968 if (dev
->pnp
.type
.bus_address
)
969 device_remove_file(&dev
->dev
, &dev_attr_adr
);
970 device_remove_file(&dev
->dev
, &dev_attr_modalias
);
971 device_remove_file(&dev
->dev
, &dev_attr_hid
);
972 if (acpi_has_method(dev
->handle
, "_STA"))
973 device_remove_file(&dev
->dev
, &dev_attr_status
);
975 device_remove_file(&dev
->dev
, &dev_attr_path
);
977 /* --------------------------------------------------------------------------
979 -------------------------------------------------------------------------- */
982 * acpi_of_match_device - Match device object using the "compatible" property.
983 * @adev: ACPI device object to match.
984 * @of_match_table: List of device IDs to match against.
986 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
987 * identifiers and a _DSD object with the "compatible" property, use that
988 * property to match against the given list of identifiers.
990 static bool acpi_of_match_device(struct acpi_device
*adev
,
991 const struct of_device_id
*of_match_table
)
993 const union acpi_object
*of_compatible
, *obj
;
999 of_compatible
= adev
->data
.of_compatible
;
1000 if (!of_match_table
|| !of_compatible
)
1003 if (of_compatible
->type
== ACPI_TYPE_PACKAGE
) {
1004 nval
= of_compatible
->package
.count
;
1005 obj
= of_compatible
->package
.elements
;
1006 } else { /* Must be ACPI_TYPE_STRING. */
1008 obj
= of_compatible
;
1010 /* Now we can look for the driver DT compatible strings */
1011 for (i
= 0; i
< nval
; i
++, obj
++) {
1012 const struct of_device_id
*id
;
1014 for (id
= of_match_table
; id
->compatible
[0]; id
++)
1015 if (!strcasecmp(obj
->string
.pointer
, id
->compatible
))
1022 static const struct acpi_device_id
*__acpi_match_device(
1023 struct acpi_device
*device
,
1024 const struct acpi_device_id
*ids
,
1025 const struct of_device_id
*of_ids
)
1027 const struct acpi_device_id
*id
;
1028 struct acpi_hardware_id
*hwid
;
1031 * If the device is not present, it is unnecessary to load device
1034 if (!device
|| !device
->status
.present
)
1037 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
) {
1038 /* First, check the ACPI/PNP IDs provided by the caller. */
1039 for (id
= ids
; id
->id
[0]; id
++)
1040 if (!strcmp((char *) id
->id
, hwid
->id
))
1044 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
1045 * "compatible" property if found.
1047 * The id returned by the below is not valid, but the only
1048 * caller passing non-NULL of_ids here is only interested in
1049 * whether or not the return value is NULL.
1051 if (!strcmp(ACPI_DT_NAMESPACE_HID
, hwid
->id
)
1052 && acpi_of_match_device(device
, of_ids
))
1059 * acpi_match_device - Match a struct device against a given list of ACPI IDs
1060 * @ids: Array of struct acpi_device_id object to match against.
1061 * @dev: The device structure to match.
1063 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
1064 * object for that handle and use that object to match against a given list of
1067 * Return a pointer to the first matching ID on success or %NULL on failure.
1069 const struct acpi_device_id
*acpi_match_device(const struct acpi_device_id
*ids
,
1070 const struct device
*dev
)
1072 return __acpi_match_device(acpi_companion_match(dev
), ids
, NULL
);
1074 EXPORT_SYMBOL_GPL(acpi_match_device
);
1076 int acpi_match_device_ids(struct acpi_device
*device
,
1077 const struct acpi_device_id
*ids
)
1079 return __acpi_match_device(device
, ids
, NULL
) ? 0 : -ENOENT
;
1081 EXPORT_SYMBOL(acpi_match_device_ids
);
1083 bool acpi_driver_match_device(struct device
*dev
,
1084 const struct device_driver
*drv
)
1086 if (!drv
->acpi_match_table
)
1087 return acpi_of_match_device(ACPI_COMPANION(dev
),
1088 drv
->of_match_table
);
1090 return !!__acpi_match_device(acpi_companion_match(dev
),
1091 drv
->acpi_match_table
, drv
->of_match_table
);
1093 EXPORT_SYMBOL_GPL(acpi_driver_match_device
);
1095 static void acpi_free_power_resources_lists(struct acpi_device
*device
)
1099 if (device
->wakeup
.flags
.valid
)
1100 acpi_power_resources_list_free(&device
->wakeup
.resources
);
1102 if (!device
->power
.flags
.power_resources
)
1105 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3_HOT
; i
++) {
1106 struct acpi_device_power_state
*ps
= &device
->power
.states
[i
];
1107 acpi_power_resources_list_free(&ps
->resources
);
1111 static void acpi_device_release(struct device
*dev
)
1113 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
1115 acpi_free_properties(acpi_dev
);
1116 acpi_free_pnp_ids(&acpi_dev
->pnp
);
1117 acpi_free_power_resources_lists(acpi_dev
);
1121 static int acpi_bus_match(struct device
*dev
, struct device_driver
*drv
)
1123 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
1124 struct acpi_driver
*acpi_drv
= to_acpi_driver(drv
);
1126 return acpi_dev
->flags
.match_driver
1127 && !acpi_match_device_ids(acpi_dev
, acpi_drv
->ids
);
1130 static int acpi_device_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
1132 return __acpi_device_uevent_modalias(to_acpi_device(dev
), env
);
1135 static void acpi_device_notify(acpi_handle handle
, u32 event
, void *data
)
1137 struct acpi_device
*device
= data
;
1139 device
->driver
->ops
.notify(device
, event
);
1142 static void acpi_device_notify_fixed(void *data
)
1144 struct acpi_device
*device
= data
;
1146 /* Fixed hardware devices have no handles */
1147 acpi_device_notify(NULL
, ACPI_FIXED_HARDWARE_EVENT
, device
);
1150 static u32
acpi_device_fixed_event(void *data
)
1152 acpi_os_execute(OSL_NOTIFY_HANDLER
, acpi_device_notify_fixed
, data
);
1153 return ACPI_INTERRUPT_HANDLED
;
1156 static int acpi_device_install_notify_handler(struct acpi_device
*device
)
1160 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
1162 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
1163 acpi_device_fixed_event
,
1165 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
1167 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
1168 acpi_device_fixed_event
,
1171 status
= acpi_install_notify_handler(device
->handle
,
1176 if (ACPI_FAILURE(status
))
1181 static void acpi_device_remove_notify_handler(struct acpi_device
*device
)
1183 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
1184 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
1185 acpi_device_fixed_event
);
1186 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
1187 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
1188 acpi_device_fixed_event
);
1190 acpi_remove_notify_handler(device
->handle
, ACPI_DEVICE_NOTIFY
,
1191 acpi_device_notify
);
1194 static int acpi_device_probe(struct device
*dev
)
1196 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
1197 struct acpi_driver
*acpi_drv
= to_acpi_driver(dev
->driver
);
1200 if (acpi_dev
->handler
&& !acpi_is_pnp_device(acpi_dev
))
1203 if (!acpi_drv
->ops
.add
)
1206 ret
= acpi_drv
->ops
.add(acpi_dev
);
1210 acpi_dev
->driver
= acpi_drv
;
1211 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1212 "Driver [%s] successfully bound to device [%s]\n",
1213 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
1215 if (acpi_drv
->ops
.notify
) {
1216 ret
= acpi_device_install_notify_handler(acpi_dev
);
1218 if (acpi_drv
->ops
.remove
)
1219 acpi_drv
->ops
.remove(acpi_dev
);
1221 acpi_dev
->driver
= NULL
;
1222 acpi_dev
->driver_data
= NULL
;
1227 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found driver [%s] for device [%s]\n",
1228 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
1233 static int acpi_device_remove(struct device
* dev
)
1235 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
1236 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
1239 if (acpi_drv
->ops
.notify
)
1240 acpi_device_remove_notify_handler(acpi_dev
);
1241 if (acpi_drv
->ops
.remove
)
1242 acpi_drv
->ops
.remove(acpi_dev
);
1244 acpi_dev
->driver
= NULL
;
1245 acpi_dev
->driver_data
= NULL
;
1251 struct bus_type acpi_bus_type
= {
1253 .match
= acpi_bus_match
,
1254 .probe
= acpi_device_probe
,
1255 .remove
= acpi_device_remove
,
1256 .uevent
= acpi_device_uevent
,
1259 static void acpi_device_del(struct acpi_device
*device
)
1261 mutex_lock(&acpi_device_lock
);
1263 list_del(&device
->node
);
1265 list_del(&device
->wakeup_list
);
1266 mutex_unlock(&acpi_device_lock
);
1268 acpi_power_add_remove_device(device
, false);
1269 acpi_device_remove_files(device
);
1271 device
->remove(device
);
1273 device_del(&device
->dev
);
1276 static LIST_HEAD(acpi_device_del_list
);
1277 static DEFINE_MUTEX(acpi_device_del_lock
);
1279 static void acpi_device_del_work_fn(struct work_struct
*work_not_used
)
1282 struct acpi_device
*adev
;
1284 mutex_lock(&acpi_device_del_lock
);
1286 if (list_empty(&acpi_device_del_list
)) {
1287 mutex_unlock(&acpi_device_del_lock
);
1290 adev
= list_first_entry(&acpi_device_del_list
,
1291 struct acpi_device
, del_list
);
1292 list_del(&adev
->del_list
);
1294 mutex_unlock(&acpi_device_del_lock
);
1296 acpi_device_del(adev
);
1298 * Drop references to all power resources that might have been
1299 * used by the device.
1301 acpi_power_transition(adev
, ACPI_STATE_D3_COLD
);
1302 put_device(&adev
->dev
);
1307 * acpi_scan_drop_device - Drop an ACPI device object.
1308 * @handle: Handle of an ACPI namespace node, not used.
1309 * @context: Address of the ACPI device object to drop.
1311 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
1312 * namespace node the device object pointed to by @context is attached to.
1314 * The unregistration is carried out asynchronously to avoid running
1315 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
1316 * ensure the correct ordering (the device objects must be unregistered in the
1317 * same order in which the corresponding namespace nodes are deleted).
1319 static void acpi_scan_drop_device(acpi_handle handle
, void *context
)
1321 static DECLARE_WORK(work
, acpi_device_del_work_fn
);
1322 struct acpi_device
*adev
= context
;
1324 mutex_lock(&acpi_device_del_lock
);
1327 * Use the ACPI hotplug workqueue which is ordered, so this work item
1328 * won't run after any hotplug work items submitted subsequently. That
1329 * prevents attempts to register device objects identical to those being
1330 * deleted from happening concurrently (such attempts result from
1331 * hotplug events handled via the ACPI hotplug workqueue). It also will
1332 * run after all of the work items submitted previosuly, which helps
1333 * those work items to ensure that they are not accessing stale device
1336 if (list_empty(&acpi_device_del_list
))
1337 acpi_queue_hotplug_work(&work
);
1339 list_add_tail(&adev
->del_list
, &acpi_device_del_list
);
1340 /* Make acpi_ns_validate_handle() return NULL for this handle. */
1341 adev
->handle
= INVALID_ACPI_HANDLE
;
1343 mutex_unlock(&acpi_device_del_lock
);
1346 static int acpi_get_device_data(acpi_handle handle
, struct acpi_device
**device
,
1347 void (*callback
)(void *))
1354 status
= acpi_get_data_full(handle
, acpi_scan_drop_device
,
1355 (void **)device
, callback
);
1356 if (ACPI_FAILURE(status
) || !*device
) {
1357 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "No context for object [%p]\n",
1364 int acpi_bus_get_device(acpi_handle handle
, struct acpi_device
**device
)
1366 return acpi_get_device_data(handle
, device
, NULL
);
1368 EXPORT_SYMBOL(acpi_bus_get_device
);
1370 static void get_acpi_device(void *dev
)
1373 get_device(&((struct acpi_device
*)dev
)->dev
);
1376 struct acpi_device
*acpi_bus_get_acpi_device(acpi_handle handle
)
1378 struct acpi_device
*adev
= NULL
;
1380 acpi_get_device_data(handle
, &adev
, get_acpi_device
);
1384 void acpi_bus_put_acpi_device(struct acpi_device
*adev
)
1386 put_device(&adev
->dev
);
1389 int acpi_device_add(struct acpi_device
*device
,
1390 void (*release
)(struct device
*))
1393 struct acpi_device_bus_id
*acpi_device_bus_id
, *new_bus_id
;
1396 if (device
->handle
) {
1399 status
= acpi_attach_data(device
->handle
, acpi_scan_drop_device
,
1401 if (ACPI_FAILURE(status
)) {
1402 acpi_handle_err(device
->handle
,
1403 "Unable to attach device data\n");
1411 * Link this device to its parent and siblings.
1413 INIT_LIST_HEAD(&device
->children
);
1414 INIT_LIST_HEAD(&device
->node
);
1415 INIT_LIST_HEAD(&device
->wakeup_list
);
1416 INIT_LIST_HEAD(&device
->physical_node_list
);
1417 INIT_LIST_HEAD(&device
->del_list
);
1418 mutex_init(&device
->physical_node_lock
);
1420 new_bus_id
= kzalloc(sizeof(struct acpi_device_bus_id
), GFP_KERNEL
);
1422 pr_err(PREFIX
"Memory allocation error\n");
1427 mutex_lock(&acpi_device_lock
);
1429 * Find suitable bus_id and instance number in acpi_bus_id_list
1430 * If failed, create one and link it into acpi_bus_id_list
1432 list_for_each_entry(acpi_device_bus_id
, &acpi_bus_id_list
, node
) {
1433 if (!strcmp(acpi_device_bus_id
->bus_id
,
1434 acpi_device_hid(device
))) {
1435 acpi_device_bus_id
->instance_no
++;
1442 acpi_device_bus_id
= new_bus_id
;
1443 strcpy(acpi_device_bus_id
->bus_id
, acpi_device_hid(device
));
1444 acpi_device_bus_id
->instance_no
= 0;
1445 list_add_tail(&acpi_device_bus_id
->node
, &acpi_bus_id_list
);
1447 dev_set_name(&device
->dev
, "%s:%02x", acpi_device_bus_id
->bus_id
, acpi_device_bus_id
->instance_no
);
1450 list_add_tail(&device
->node
, &device
->parent
->children
);
1452 if (device
->wakeup
.flags
.valid
)
1453 list_add_tail(&device
->wakeup_list
, &acpi_wakeup_device_list
);
1454 mutex_unlock(&acpi_device_lock
);
1457 device
->dev
.parent
= &device
->parent
->dev
;
1458 device
->dev
.bus
= &acpi_bus_type
;
1459 device
->dev
.release
= release
;
1460 result
= device_add(&device
->dev
);
1462 dev_err(&device
->dev
, "Error registering device\n");
1466 result
= acpi_device_setup_files(device
);
1468 printk(KERN_ERR PREFIX
"Error creating sysfs interface for device %s\n",
1469 dev_name(&device
->dev
));
1474 mutex_lock(&acpi_device_lock
);
1476 list_del(&device
->node
);
1477 list_del(&device
->wakeup_list
);
1478 mutex_unlock(&acpi_device_lock
);
1481 acpi_detach_data(device
->handle
, acpi_scan_drop_device
);
1485 struct acpi_device
*acpi_get_next_child(struct device
*dev
,
1486 struct acpi_device
*child
)
1488 struct acpi_device
*adev
= ACPI_COMPANION(dev
);
1489 struct list_head
*head
, *next
;
1494 head
= &adev
->children
;
1495 if (list_empty(head
))
1499 return list_first_entry(head
, struct acpi_device
, node
);
1501 next
= child
->node
.next
;
1502 return next
== head
? NULL
: list_entry(next
, struct acpi_device
, node
);
1505 /* --------------------------------------------------------------------------
1507 -------------------------------------------------------------------------- */
1509 * acpi_bus_register_driver - register a driver with the ACPI bus
1510 * @driver: driver being registered
1512 * Registers a driver with the ACPI bus. Searches the namespace for all
1513 * devices that match the driver's criteria and binds. Returns zero for
1514 * success or a negative error status for failure.
1516 int acpi_bus_register_driver(struct acpi_driver
*driver
)
1522 driver
->drv
.name
= driver
->name
;
1523 driver
->drv
.bus
= &acpi_bus_type
;
1524 driver
->drv
.owner
= driver
->owner
;
1526 ret
= driver_register(&driver
->drv
);
1530 EXPORT_SYMBOL(acpi_bus_register_driver
);
1533 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1534 * @driver: driver to unregister
1536 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1537 * devices that match the driver's criteria and unbinds.
1539 void acpi_bus_unregister_driver(struct acpi_driver
*driver
)
1541 driver_unregister(&driver
->drv
);
1544 EXPORT_SYMBOL(acpi_bus_unregister_driver
);
1546 /* --------------------------------------------------------------------------
1548 -------------------------------------------------------------------------- */
1549 static struct acpi_device
*acpi_bus_get_parent(acpi_handle handle
)
1551 struct acpi_device
*device
= NULL
;
1555 * Fixed hardware devices do not appear in the namespace and do not
1556 * have handles, but we fabricate acpi_devices for them, so we have
1557 * to deal with them specially.
1563 status
= acpi_get_parent(handle
, &handle
);
1564 if (ACPI_FAILURE(status
))
1565 return status
== AE_NULL_ENTRY
? NULL
: acpi_root
;
1566 } while (acpi_bus_get_device(handle
, &device
));
1571 acpi_bus_get_ejd(acpi_handle handle
, acpi_handle
*ejd
)
1575 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
1576 union acpi_object
*obj
;
1578 status
= acpi_get_handle(handle
, "_EJD", &tmp
);
1579 if (ACPI_FAILURE(status
))
1582 status
= acpi_evaluate_object(handle
, "_EJD", NULL
, &buffer
);
1583 if (ACPI_SUCCESS(status
)) {
1584 obj
= buffer
.pointer
;
1585 status
= acpi_get_handle(ACPI_ROOT_OBJECT
, obj
->string
.pointer
,
1587 kfree(buffer
.pointer
);
1591 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd
);
1593 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle
,
1594 struct acpi_device_wakeup
*wakeup
)
1596 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1597 union acpi_object
*package
= NULL
;
1598 union acpi_object
*element
= NULL
;
1605 INIT_LIST_HEAD(&wakeup
->resources
);
1608 status
= acpi_evaluate_object(handle
, "_PRW", NULL
, &buffer
);
1609 if (ACPI_FAILURE(status
)) {
1610 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRW"));
1614 package
= (union acpi_object
*)buffer
.pointer
;
1616 if (!package
|| package
->package
.count
< 2)
1619 element
= &(package
->package
.elements
[0]);
1623 if (element
->type
== ACPI_TYPE_PACKAGE
) {
1624 if ((element
->package
.count
< 2) ||
1625 (element
->package
.elements
[0].type
!=
1626 ACPI_TYPE_LOCAL_REFERENCE
)
1627 || (element
->package
.elements
[1].type
!= ACPI_TYPE_INTEGER
))
1630 wakeup
->gpe_device
=
1631 element
->package
.elements
[0].reference
.handle
;
1632 wakeup
->gpe_number
=
1633 (u32
) element
->package
.elements
[1].integer
.value
;
1634 } else if (element
->type
== ACPI_TYPE_INTEGER
) {
1635 wakeup
->gpe_device
= NULL
;
1636 wakeup
->gpe_number
= element
->integer
.value
;
1641 element
= &(package
->package
.elements
[1]);
1642 if (element
->type
!= ACPI_TYPE_INTEGER
)
1645 wakeup
->sleep_state
= element
->integer
.value
;
1647 err
= acpi_extract_power_resources(package
, 2, &wakeup
->resources
);
1651 if (!list_empty(&wakeup
->resources
)) {
1654 err
= acpi_power_wakeup_list_init(&wakeup
->resources
,
1657 acpi_handle_warn(handle
, "Retrieving current states "
1658 "of wakeup power resources failed\n");
1659 acpi_power_resources_list_free(&wakeup
->resources
);
1662 if (sleep_state
< wakeup
->sleep_state
) {
1663 acpi_handle_warn(handle
, "Overriding _PRW sleep state "
1664 "(S%d) by S%d from power resources\n",
1665 (int)wakeup
->sleep_state
, sleep_state
);
1666 wakeup
->sleep_state
= sleep_state
;
1671 kfree(buffer
.pointer
);
1675 static void acpi_wakeup_gpe_init(struct acpi_device
*device
)
1677 static const struct acpi_device_id button_device_ids
[] = {
1683 struct acpi_device_wakeup
*wakeup
= &device
->wakeup
;
1685 acpi_event_status event_status
;
1687 wakeup
->flags
.notifier_present
= 0;
1689 /* Power button, Lid switch always enable wakeup */
1690 if (!acpi_match_device_ids(device
, button_device_ids
)) {
1691 wakeup
->flags
.run_wake
= 1;
1692 if (!acpi_match_device_ids(device
, &button_device_ids
[1])) {
1693 /* Do not use Lid/sleep button for S5 wakeup */
1694 if (wakeup
->sleep_state
== ACPI_STATE_S5
)
1695 wakeup
->sleep_state
= ACPI_STATE_S4
;
1697 acpi_mark_gpe_for_wake(wakeup
->gpe_device
, wakeup
->gpe_number
);
1698 device_set_wakeup_capable(&device
->dev
, true);
1702 acpi_setup_gpe_for_wake(device
->handle
, wakeup
->gpe_device
,
1703 wakeup
->gpe_number
);
1704 status
= acpi_get_gpe_status(wakeup
->gpe_device
, wakeup
->gpe_number
,
1706 if (ACPI_FAILURE(status
))
1709 wakeup
->flags
.run_wake
= !!(event_status
& ACPI_EVENT_FLAG_HAS_HANDLER
);
1712 static void acpi_bus_get_wakeup_device_flags(struct acpi_device
*device
)
1716 /* Presence of _PRW indicates wake capable */
1717 if (!acpi_has_method(device
->handle
, "_PRW"))
1720 err
= acpi_bus_extract_wakeup_device_power_package(device
->handle
,
1723 dev_err(&device
->dev
, "_PRW evaluation error: %d\n", err
);
1727 device
->wakeup
.flags
.valid
= 1;
1728 device
->wakeup
.prepare_count
= 0;
1729 acpi_wakeup_gpe_init(device
);
1730 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1731 * system for the ACPI device with the _PRW object.
1732 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1733 * So it is necessary to call _DSW object first. Only when it is not
1734 * present will the _PSW object used.
1736 err
= acpi_device_sleep_wake(device
, 0, 0, 0);
1738 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1739 "error in _DSW or _PSW evaluation\n"));
1742 static void acpi_bus_init_power_state(struct acpi_device
*device
, int state
)
1744 struct acpi_device_power_state
*ps
= &device
->power
.states
[state
];
1745 char pathname
[5] = { '_', 'P', 'R', '0' + state
, '\0' };
1746 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1749 INIT_LIST_HEAD(&ps
->resources
);
1751 /* Evaluate "_PRx" to get referenced power resources */
1752 status
= acpi_evaluate_object(device
->handle
, pathname
, NULL
, &buffer
);
1753 if (ACPI_SUCCESS(status
)) {
1754 union acpi_object
*package
= buffer
.pointer
;
1756 if (buffer
.length
&& package
1757 && package
->type
== ACPI_TYPE_PACKAGE
1758 && package
->package
.count
) {
1759 int err
= acpi_extract_power_resources(package
, 0,
1762 device
->power
.flags
.power_resources
= 1;
1764 ACPI_FREE(buffer
.pointer
);
1767 /* Evaluate "_PSx" to see if we can do explicit sets */
1769 if (acpi_has_method(device
->handle
, pathname
))
1770 ps
->flags
.explicit_set
= 1;
1772 /* State is valid if there are means to put the device into it. */
1773 if (!list_empty(&ps
->resources
) || ps
->flags
.explicit_set
)
1774 ps
->flags
.valid
= 1;
1776 ps
->power
= -1; /* Unknown - driver assigned */
1777 ps
->latency
= -1; /* Unknown - driver assigned */
1780 static void acpi_bus_get_power_flags(struct acpi_device
*device
)
1784 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1785 if (!acpi_has_method(device
->handle
, "_PS0") &&
1786 !acpi_has_method(device
->handle
, "_PR0"))
1789 device
->flags
.power_manageable
= 1;
1792 * Power Management Flags
1794 if (acpi_has_method(device
->handle
, "_PSC"))
1795 device
->power
.flags
.explicit_get
= 1;
1797 if (acpi_has_method(device
->handle
, "_IRC"))
1798 device
->power
.flags
.inrush_current
= 1;
1800 if (acpi_has_method(device
->handle
, "_DSW"))
1801 device
->power
.flags
.dsw_present
= 1;
1804 * Enumerate supported power management states
1806 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3_HOT
; i
++)
1807 acpi_bus_init_power_state(device
, i
);
1809 INIT_LIST_HEAD(&device
->power
.states
[ACPI_STATE_D3_COLD
].resources
);
1810 if (!list_empty(&device
->power
.states
[ACPI_STATE_D3_HOT
].resources
))
1811 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.valid
= 1;
1813 /* Set defaults for D0 and D3hot states (always valid) */
1814 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
= 1;
1815 device
->power
.states
[ACPI_STATE_D0
].power
= 100;
1816 device
->power
.states
[ACPI_STATE_D3_HOT
].flags
.valid
= 1;
1818 if (acpi_bus_init_power(device
))
1819 device
->flags
.power_manageable
= 0;
1822 static void acpi_bus_get_flags(struct acpi_device
*device
)
1824 /* Presence of _STA indicates 'dynamic_status' */
1825 if (acpi_has_method(device
->handle
, "_STA"))
1826 device
->flags
.dynamic_status
= 1;
1828 /* Presence of _RMV indicates 'removable' */
1829 if (acpi_has_method(device
->handle
, "_RMV"))
1830 device
->flags
.removable
= 1;
1832 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1833 if (acpi_has_method(device
->handle
, "_EJD") ||
1834 acpi_has_method(device
->handle
, "_EJ0"))
1835 device
->flags
.ejectable
= 1;
1838 static void acpi_device_get_busid(struct acpi_device
*device
)
1840 char bus_id
[5] = { '?', 0 };
1841 struct acpi_buffer buffer
= { sizeof(bus_id
), bus_id
};
1847 * The device's Bus ID is simply the object name.
1848 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1850 if (ACPI_IS_ROOT_DEVICE(device
)) {
1851 strcpy(device
->pnp
.bus_id
, "ACPI");
1855 switch (device
->device_type
) {
1856 case ACPI_BUS_TYPE_POWER_BUTTON
:
1857 strcpy(device
->pnp
.bus_id
, "PWRF");
1859 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1860 strcpy(device
->pnp
.bus_id
, "SLPF");
1863 acpi_get_name(device
->handle
, ACPI_SINGLE_NAME
, &buffer
);
1864 /* Clean up trailing underscores (if any) */
1865 for (i
= 3; i
> 1; i
--) {
1866 if (bus_id
[i
] == '_')
1871 strcpy(device
->pnp
.bus_id
, bus_id
);
1877 * acpi_ata_match - see if an acpi object is an ATA device
1879 * If an acpi object has one of the ACPI ATA methods defined,
1880 * then we can safely call it an ATA device.
1882 bool acpi_ata_match(acpi_handle handle
)
1884 return acpi_has_method(handle
, "_GTF") ||
1885 acpi_has_method(handle
, "_GTM") ||
1886 acpi_has_method(handle
, "_STM") ||
1887 acpi_has_method(handle
, "_SDD");
1891 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1893 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1894 * then we can safely call it an ejectable drive bay
1896 bool acpi_bay_match(acpi_handle handle
)
1898 acpi_handle phandle
;
1900 if (!acpi_has_method(handle
, "_EJ0"))
1902 if (acpi_ata_match(handle
))
1904 if (ACPI_FAILURE(acpi_get_parent(handle
, &phandle
)))
1907 return acpi_ata_match(phandle
);
1910 bool acpi_device_is_battery(struct acpi_device
*adev
)
1912 struct acpi_hardware_id
*hwid
;
1914 list_for_each_entry(hwid
, &adev
->pnp
.ids
, list
)
1915 if (!strcmp("PNP0C0A", hwid
->id
))
1921 static bool is_ejectable_bay(struct acpi_device
*adev
)
1923 acpi_handle handle
= adev
->handle
;
1925 if (acpi_has_method(handle
, "_EJ0") && acpi_device_is_battery(adev
))
1928 return acpi_bay_match(handle
);
1932 * acpi_dock_match - see if an acpi object has a _DCK method
1934 bool acpi_dock_match(acpi_handle handle
)
1936 return acpi_has_method(handle
, "_DCK");
1940 acpi_backlight_cap_match(acpi_handle handle
, u32 level
, void *context
,
1941 void **return_value
)
1943 long *cap
= context
;
1945 if (acpi_has_method(handle
, "_BCM") &&
1946 acpi_has_method(handle
, "_BCL")) {
1947 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found generic backlight "
1949 *cap
|= ACPI_VIDEO_BACKLIGHT
;
1950 if (!acpi_has_method(handle
, "_BQC"))
1951 printk(KERN_WARNING FW_BUG PREFIX
"No _BQC method, "
1952 "cannot determine initial brightness\n");
1953 /* We have backlight support, no need to scan further */
1954 return AE_CTRL_TERMINATE
;
1959 /* Returns true if the ACPI object is a video device which can be
1960 * handled by video.ko.
1961 * The device will get a Linux specific CID added in scan.c to
1962 * identify the device as an ACPI graphics device
1963 * Be aware that the graphics device may not be physically present
1964 * Use acpi_video_get_capabilities() to detect general ACPI video
1965 * capabilities of present cards
1967 long acpi_is_video_device(acpi_handle handle
)
1969 long video_caps
= 0;
1971 /* Is this device able to support video switching ? */
1972 if (acpi_has_method(handle
, "_DOD") || acpi_has_method(handle
, "_DOS"))
1973 video_caps
|= ACPI_VIDEO_OUTPUT_SWITCHING
;
1975 /* Is this device able to retrieve a video ROM ? */
1976 if (acpi_has_method(handle
, "_ROM"))
1977 video_caps
|= ACPI_VIDEO_ROM_AVAILABLE
;
1979 /* Is this device able to configure which video head to be POSTed ? */
1980 if (acpi_has_method(handle
, "_VPO") &&
1981 acpi_has_method(handle
, "_GPD") &&
1982 acpi_has_method(handle
, "_SPD"))
1983 video_caps
|= ACPI_VIDEO_DEVICE_POSTING
;
1985 /* Only check for backlight functionality if one of the above hit. */
1987 acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
,
1988 ACPI_UINT32_MAX
, acpi_backlight_cap_match
, NULL
,
1993 EXPORT_SYMBOL(acpi_is_video_device
);
1995 const char *acpi_device_hid(struct acpi_device
*device
)
1997 struct acpi_hardware_id
*hid
;
1999 if (list_empty(&device
->pnp
.ids
))
2002 hid
= list_first_entry(&device
->pnp
.ids
, struct acpi_hardware_id
, list
);
2005 EXPORT_SYMBOL(acpi_device_hid
);
2007 static void acpi_add_id(struct acpi_device_pnp
*pnp
, const char *dev_id
)
2009 struct acpi_hardware_id
*id
;
2011 id
= kmalloc(sizeof(*id
), GFP_KERNEL
);
2015 id
->id
= kstrdup(dev_id
, GFP_KERNEL
);
2021 list_add_tail(&id
->list
, &pnp
->ids
);
2022 pnp
->type
.hardware_id
= 1;
2026 * Old IBM workstations have a DSDT bug wherein the SMBus object
2027 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
2028 * prefix. Work around this.
2030 static bool acpi_ibm_smbus_match(acpi_handle handle
)
2032 char node_name
[ACPI_PATH_SEGMENT_LENGTH
];
2033 struct acpi_buffer path
= { sizeof(node_name
), node_name
};
2035 if (!dmi_name_in_vendors("IBM"))
2038 /* Look for SMBS object */
2039 if (ACPI_FAILURE(acpi_get_name(handle
, ACPI_SINGLE_NAME
, &path
)) ||
2040 strcmp("SMBS", path
.pointer
))
2043 /* Does it have the necessary (but misnamed) methods? */
2044 if (acpi_has_method(handle
, "SBI") &&
2045 acpi_has_method(handle
, "SBR") &&
2046 acpi_has_method(handle
, "SBW"))
2052 static bool acpi_object_is_system_bus(acpi_handle handle
)
2056 if (ACPI_SUCCESS(acpi_get_handle(NULL
, "\\_SB", &tmp
)) &&
2059 if (ACPI_SUCCESS(acpi_get_handle(NULL
, "\\_TZ", &tmp
)) &&
2066 static void acpi_set_pnp_ids(acpi_handle handle
, struct acpi_device_pnp
*pnp
,
2070 struct acpi_device_info
*info
;
2071 struct acpi_pnp_device_id_list
*cid_list
;
2074 switch (device_type
) {
2075 case ACPI_BUS_TYPE_DEVICE
:
2076 if (handle
== ACPI_ROOT_OBJECT
) {
2077 acpi_add_id(pnp
, ACPI_SYSTEM_HID
);
2081 status
= acpi_get_object_info(handle
, &info
);
2082 if (ACPI_FAILURE(status
)) {
2083 pr_err(PREFIX
"%s: Error reading device info\n",
2088 if (info
->valid
& ACPI_VALID_HID
) {
2089 acpi_add_id(pnp
, info
->hardware_id
.string
);
2090 pnp
->type
.platform_id
= 1;
2092 if (info
->valid
& ACPI_VALID_CID
) {
2093 cid_list
= &info
->compatible_id_list
;
2094 for (i
= 0; i
< cid_list
->count
; i
++)
2095 acpi_add_id(pnp
, cid_list
->ids
[i
].string
);
2097 if (info
->valid
& ACPI_VALID_ADR
) {
2098 pnp
->bus_address
= info
->address
;
2099 pnp
->type
.bus_address
= 1;
2101 if (info
->valid
& ACPI_VALID_UID
)
2102 pnp
->unique_id
= kstrdup(info
->unique_id
.string
,
2108 * Some devices don't reliably have _HIDs & _CIDs, so add
2109 * synthetic HIDs to make sure drivers can find them.
2111 if (acpi_is_video_device(handle
))
2112 acpi_add_id(pnp
, ACPI_VIDEO_HID
);
2113 else if (acpi_bay_match(handle
))
2114 acpi_add_id(pnp
, ACPI_BAY_HID
);
2115 else if (acpi_dock_match(handle
))
2116 acpi_add_id(pnp
, ACPI_DOCK_HID
);
2117 else if (acpi_ibm_smbus_match(handle
))
2118 acpi_add_id(pnp
, ACPI_SMBUS_IBM_HID
);
2119 else if (list_empty(&pnp
->ids
) &&
2120 acpi_object_is_system_bus(handle
)) {
2121 /* \_SB, \_TZ, LNXSYBUS */
2122 acpi_add_id(pnp
, ACPI_BUS_HID
);
2123 strcpy(pnp
->device_name
, ACPI_BUS_DEVICE_NAME
);
2124 strcpy(pnp
->device_class
, ACPI_BUS_CLASS
);
2128 case ACPI_BUS_TYPE_POWER
:
2129 acpi_add_id(pnp
, ACPI_POWER_HID
);
2131 case ACPI_BUS_TYPE_PROCESSOR
:
2132 acpi_add_id(pnp
, ACPI_PROCESSOR_OBJECT_HID
);
2134 case ACPI_BUS_TYPE_THERMAL
:
2135 acpi_add_id(pnp
, ACPI_THERMAL_HID
);
2137 case ACPI_BUS_TYPE_POWER_BUTTON
:
2138 acpi_add_id(pnp
, ACPI_BUTTON_HID_POWERF
);
2140 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
2141 acpi_add_id(pnp
, ACPI_BUTTON_HID_SLEEPF
);
2146 void acpi_free_pnp_ids(struct acpi_device_pnp
*pnp
)
2148 struct acpi_hardware_id
*id
, *tmp
;
2150 list_for_each_entry_safe(id
, tmp
, &pnp
->ids
, list
) {
2154 kfree(pnp
->unique_id
);
2157 static void acpi_init_coherency(struct acpi_device
*adev
)
2159 unsigned long long cca
= 0;
2161 struct acpi_device
*parent
= adev
->parent
;
2163 if (parent
&& parent
->flags
.cca_seen
) {
2165 * From ACPI spec, OSPM will ignore _CCA if an ancestor
2168 adev
->flags
.cca_seen
= 1;
2169 cca
= parent
->flags
.coherent_dma
;
2171 status
= acpi_evaluate_integer(adev
->handle
, "_CCA",
2173 if (ACPI_SUCCESS(status
))
2174 adev
->flags
.cca_seen
= 1;
2175 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED
))
2177 * If architecture does not specify that _CCA is
2178 * required for DMA-able devices (e.g. x86),
2179 * we default to _CCA=1.
2183 acpi_handle_debug(adev
->handle
,
2184 "ACPI device is missing _CCA.\n");
2187 adev
->flags
.coherent_dma
= cca
;
2190 void acpi_init_device_object(struct acpi_device
*device
, acpi_handle handle
,
2191 int type
, unsigned long long sta
)
2193 INIT_LIST_HEAD(&device
->pnp
.ids
);
2194 device
->device_type
= type
;
2195 device
->handle
= handle
;
2196 device
->parent
= acpi_bus_get_parent(handle
);
2197 device
->fwnode
.type
= FWNODE_ACPI
;
2198 acpi_set_device_status(device
, sta
);
2199 acpi_device_get_busid(device
);
2200 acpi_set_pnp_ids(handle
, &device
->pnp
, type
);
2201 acpi_init_properties(device
);
2202 acpi_bus_get_flags(device
);
2203 device
->flags
.match_driver
= false;
2204 device
->flags
.initialized
= true;
2205 device
->flags
.visited
= false;
2206 device_initialize(&device
->dev
);
2207 dev_set_uevent_suppress(&device
->dev
, true);
2208 acpi_init_coherency(device
);
2211 void acpi_device_add_finalize(struct acpi_device
*device
)
2213 dev_set_uevent_suppress(&device
->dev
, false);
2214 kobject_uevent(&device
->dev
.kobj
, KOBJ_ADD
);
2217 static int acpi_add_single_object(struct acpi_device
**child
,
2218 acpi_handle handle
, int type
,
2219 unsigned long long sta
)
2222 struct acpi_device
*device
;
2223 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
2225 device
= kzalloc(sizeof(struct acpi_device
), GFP_KERNEL
);
2227 printk(KERN_ERR PREFIX
"Memory allocation error\n");
2231 acpi_init_device_object(device
, handle
, type
, sta
);
2232 acpi_bus_get_power_flags(device
);
2233 acpi_bus_get_wakeup_device_flags(device
);
2235 result
= acpi_device_add(device
, acpi_device_release
);
2237 acpi_device_release(&device
->dev
);
2241 acpi_power_add_remove_device(device
, true);
2242 acpi_device_add_finalize(device
);
2243 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
2244 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Added %s [%s] parent %s\n",
2245 dev_name(&device
->dev
), (char *) buffer
.pointer
,
2246 device
->parent
? dev_name(&device
->parent
->dev
) : "(null)"));
2247 kfree(buffer
.pointer
);
2252 static int acpi_bus_type_and_status(acpi_handle handle
, int *type
,
2253 unsigned long long *sta
)
2256 acpi_object_type acpi_type
;
2258 status
= acpi_get_type(handle
, &acpi_type
);
2259 if (ACPI_FAILURE(status
))
2262 switch (acpi_type
) {
2263 case ACPI_TYPE_ANY
: /* for ACPI_ROOT_OBJECT */
2264 case ACPI_TYPE_DEVICE
:
2265 *type
= ACPI_BUS_TYPE_DEVICE
;
2266 status
= acpi_bus_get_status_handle(handle
, sta
);
2267 if (ACPI_FAILURE(status
))
2270 case ACPI_TYPE_PROCESSOR
:
2271 *type
= ACPI_BUS_TYPE_PROCESSOR
;
2272 status
= acpi_bus_get_status_handle(handle
, sta
);
2273 if (ACPI_FAILURE(status
))
2276 case ACPI_TYPE_THERMAL
:
2277 *type
= ACPI_BUS_TYPE_THERMAL
;
2278 *sta
= ACPI_STA_DEFAULT
;
2280 case ACPI_TYPE_POWER
:
2281 *type
= ACPI_BUS_TYPE_POWER
;
2282 *sta
= ACPI_STA_DEFAULT
;
2291 bool acpi_device_is_present(struct acpi_device
*adev
)
2293 if (adev
->status
.present
|| adev
->status
.functional
)
2296 adev
->flags
.initialized
= false;
2300 static bool acpi_scan_handler_matching(struct acpi_scan_handler
*handler
,
2302 const struct acpi_device_id
**matchid
)
2304 const struct acpi_device_id
*devid
;
2307 return handler
->match(idstr
, matchid
);
2309 for (devid
= handler
->ids
; devid
->id
[0]; devid
++)
2310 if (!strcmp((char *)devid
->id
, idstr
)) {
2320 static struct acpi_scan_handler
*acpi_scan_match_handler(char *idstr
,
2321 const struct acpi_device_id
**matchid
)
2323 struct acpi_scan_handler
*handler
;
2325 list_for_each_entry(handler
, &acpi_scan_handlers_list
, list_node
)
2326 if (acpi_scan_handler_matching(handler
, idstr
, matchid
))
2332 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile
*hotplug
, bool val
)
2334 if (!!hotplug
->enabled
== !!val
)
2337 mutex_lock(&acpi_scan_lock
);
2339 hotplug
->enabled
= val
;
2341 mutex_unlock(&acpi_scan_lock
);
2344 static void acpi_scan_init_hotplug(struct acpi_device
*adev
)
2346 struct acpi_hardware_id
*hwid
;
2348 if (acpi_dock_match(adev
->handle
) || is_ejectable_bay(adev
)) {
2349 acpi_dock_add(adev
);
2352 list_for_each_entry(hwid
, &adev
->pnp
.ids
, list
) {
2353 struct acpi_scan_handler
*handler
;
2355 handler
= acpi_scan_match_handler(hwid
->id
, NULL
);
2357 adev
->flags
.hotplug_notify
= true;
2363 static void acpi_device_dep_initialize(struct acpi_device
*adev
)
2365 struct acpi_dep_data
*dep
;
2366 struct acpi_handle_list dep_devices
;
2370 if (!acpi_has_method(adev
->handle
, "_DEP"))
2373 status
= acpi_evaluate_reference(adev
->handle
, "_DEP", NULL
,
2375 if (ACPI_FAILURE(status
)) {
2376 dev_dbg(&adev
->dev
, "Failed to evaluate _DEP.\n");
2380 for (i
= 0; i
< dep_devices
.count
; i
++) {
2381 struct acpi_device_info
*info
;
2384 status
= acpi_get_object_info(dep_devices
.handles
[i
], &info
);
2385 if (ACPI_FAILURE(status
)) {
2386 dev_dbg(&adev
->dev
, "Error reading _DEP device info\n");
2391 * Skip the dependency of Windows System Power
2392 * Management Controller
2394 skip
= info
->valid
& ACPI_VALID_HID
&&
2395 !strcmp(info
->hardware_id
.string
, "INT3396");
2402 dep
= kzalloc(sizeof(struct acpi_dep_data
), GFP_KERNEL
);
2406 dep
->master
= dep_devices
.handles
[i
];
2407 dep
->slave
= adev
->handle
;
2410 mutex_lock(&acpi_dep_list_lock
);
2411 list_add_tail(&dep
->node
, &acpi_dep_list
);
2412 mutex_unlock(&acpi_dep_list_lock
);
2416 static acpi_status
acpi_bus_check_add(acpi_handle handle
, u32 lvl_not_used
,
2417 void *not_used
, void **return_value
)
2419 struct acpi_device
*device
= NULL
;
2421 unsigned long long sta
;
2424 acpi_bus_get_device(handle
, &device
);
2428 result
= acpi_bus_type_and_status(handle
, &type
, &sta
);
2432 if (type
== ACPI_BUS_TYPE_POWER
) {
2433 acpi_add_power_resource(handle
);
2437 acpi_add_single_object(&device
, handle
, type
, sta
);
2439 return AE_CTRL_DEPTH
;
2441 acpi_scan_init_hotplug(device
);
2442 acpi_device_dep_initialize(device
);
2446 *return_value
= device
;
2451 static int acpi_check_spi_i2c_slave(struct acpi_resource
*ares
, void *data
)
2453 bool *is_spi_i2c_slave_p
= data
;
2455 if (ares
->type
!= ACPI_RESOURCE_TYPE_SERIAL_BUS
)
2459 * devices that are connected to UART still need to be enumerated to
2462 if (ares
->data
.common_serial_bus
.type
!= ACPI_RESOURCE_SERIAL_TYPE_UART
)
2463 *is_spi_i2c_slave_p
= true;
2465 /* no need to do more checking */
2469 static void acpi_default_enumeration(struct acpi_device
*device
)
2471 struct list_head resource_list
;
2472 bool is_spi_i2c_slave
= false;
2475 * Do not enemerate SPI/I2C slaves as they will be enuerated by their
2476 * respective parents.
2478 INIT_LIST_HEAD(&resource_list
);
2479 acpi_dev_get_resources(device
, &resource_list
, acpi_check_spi_i2c_slave
,
2481 acpi_dev_free_resource_list(&resource_list
);
2482 if (!is_spi_i2c_slave
)
2483 acpi_create_platform_device(device
);
2486 static const struct acpi_device_id generic_device_ids
[] = {
2487 {ACPI_DT_NAMESPACE_HID
, },
2491 static int acpi_generic_device_attach(struct acpi_device
*adev
,
2492 const struct acpi_device_id
*not_used
)
2495 * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
2496 * below can be unconditional.
2498 if (adev
->data
.of_compatible
)
2499 acpi_default_enumeration(adev
);
2504 static struct acpi_scan_handler generic_device_handler
= {
2505 .ids
= generic_device_ids
,
2506 .attach
= acpi_generic_device_attach
,
2509 static int acpi_scan_attach_handler(struct acpi_device
*device
)
2511 struct acpi_hardware_id
*hwid
;
2514 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
) {
2515 const struct acpi_device_id
*devid
;
2516 struct acpi_scan_handler
*handler
;
2518 handler
= acpi_scan_match_handler(hwid
->id
, &devid
);
2520 if (!handler
->attach
) {
2521 device
->pnp
.type
.platform_id
= 0;
2524 device
->handler
= handler
;
2525 ret
= handler
->attach(device
, devid
);
2529 device
->handler
= NULL
;
2538 static void acpi_bus_attach(struct acpi_device
*device
)
2540 struct acpi_device
*child
;
2544 if (ACPI_SUCCESS(acpi_bus_get_ejd(device
->handle
, &ejd
)))
2545 register_dock_dependent_device(device
, ejd
);
2547 acpi_bus_get_status(device
);
2548 /* Skip devices that are not present. */
2549 if (!acpi_device_is_present(device
)) {
2550 device
->flags
.visited
= false;
2551 device
->flags
.power_manageable
= 0;
2554 if (device
->handler
)
2557 if (!device
->flags
.initialized
) {
2558 device
->flags
.power_manageable
=
2559 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
;
2560 if (acpi_bus_init_power(device
))
2561 device
->flags
.power_manageable
= 0;
2563 device
->flags
.initialized
= true;
2565 device
->flags
.visited
= false;
2566 ret
= acpi_scan_attach_handler(device
);
2570 device
->flags
.match_driver
= true;
2572 ret
= device_attach(&device
->dev
);
2576 if (!ret
&& device
->pnp
.type
.platform_id
)
2577 acpi_default_enumeration(device
);
2579 device
->flags
.visited
= true;
2582 list_for_each_entry(child
, &device
->children
, node
)
2583 acpi_bus_attach(child
);
2585 if (device
->handler
&& device
->handler
->hotplug
.notify_online
)
2586 device
->handler
->hotplug
.notify_online(device
);
2589 void acpi_walk_dep_device_list(acpi_handle handle
)
2591 struct acpi_dep_data
*dep
, *tmp
;
2592 struct acpi_device
*adev
;
2594 mutex_lock(&acpi_dep_list_lock
);
2595 list_for_each_entry_safe(dep
, tmp
, &acpi_dep_list
, node
) {
2596 if (dep
->master
== handle
) {
2597 acpi_bus_get_device(dep
->slave
, &adev
);
2602 if (!adev
->dep_unmet
)
2603 acpi_bus_attach(adev
);
2604 list_del(&dep
->node
);
2608 mutex_unlock(&acpi_dep_list_lock
);
2610 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list
);
2613 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2614 * @handle: Root of the namespace scope to scan.
2616 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2619 * If no devices were found, -ENODEV is returned, but it does not mean that
2620 * there has been a real error. There just have been no suitable ACPI objects
2621 * in the table trunk from which the kernel could create a device and add an
2622 * appropriate driver.
2624 * Must be called under acpi_scan_lock.
2626 int acpi_bus_scan(acpi_handle handle
)
2628 void *device
= NULL
;
2630 if (ACPI_SUCCESS(acpi_bus_check_add(handle
, 0, NULL
, &device
)))
2631 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
2632 acpi_bus_check_add
, NULL
, NULL
, &device
);
2635 acpi_bus_attach(device
);
2640 EXPORT_SYMBOL(acpi_bus_scan
);
2643 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2644 * @adev: Root of the ACPI namespace scope to walk.
2646 * Must be called under acpi_scan_lock.
2648 void acpi_bus_trim(struct acpi_device
*adev
)
2650 struct acpi_scan_handler
*handler
= adev
->handler
;
2651 struct acpi_device
*child
;
2653 list_for_each_entry_reverse(child
, &adev
->children
, node
)
2654 acpi_bus_trim(child
);
2656 adev
->flags
.match_driver
= false;
2658 if (handler
->detach
)
2659 handler
->detach(adev
);
2661 adev
->handler
= NULL
;
2663 device_release_driver(&adev
->dev
);
2666 * Most likely, the device is going away, so put it into D3cold before
2669 acpi_device_set_power(adev
, ACPI_STATE_D3_COLD
);
2670 adev
->flags
.initialized
= false;
2671 adev
->flags
.visited
= false;
2673 EXPORT_SYMBOL_GPL(acpi_bus_trim
);
2675 static int acpi_bus_scan_fixed(void)
2680 * Enumerate all fixed-feature devices.
2682 if (!(acpi_gbl_FADT
.flags
& ACPI_FADT_POWER_BUTTON
)) {
2683 struct acpi_device
*device
= NULL
;
2685 result
= acpi_add_single_object(&device
, NULL
,
2686 ACPI_BUS_TYPE_POWER_BUTTON
,
2691 device
->flags
.match_driver
= true;
2692 result
= device_attach(&device
->dev
);
2696 device_init_wakeup(&device
->dev
, true);
2699 if (!(acpi_gbl_FADT
.flags
& ACPI_FADT_SLEEP_BUTTON
)) {
2700 struct acpi_device
*device
= NULL
;
2702 result
= acpi_add_single_object(&device
, NULL
,
2703 ACPI_BUS_TYPE_SLEEP_BUTTON
,
2708 device
->flags
.match_driver
= true;
2709 result
= device_attach(&device
->dev
);
2712 return result
< 0 ? result
: 0;
2715 int __init
acpi_scan_init(void)
2719 result
= bus_register(&acpi_bus_type
);
2721 /* We don't want to quit even if we failed to add suspend/resume */
2722 printk(KERN_ERR PREFIX
"Could not register bus type\n");
2725 acpi_pci_root_init();
2726 acpi_pci_link_init();
2727 acpi_processor_init();
2730 acpi_cmos_rtc_init();
2731 acpi_container_init();
2732 acpi_memory_hotplug_init();
2734 acpi_int340x_thermal_init();
2736 acpi_scan_add_handler(&generic_device_handler
);
2738 mutex_lock(&acpi_scan_lock
);
2740 * Enumerate devices in the ACPI namespace.
2742 result
= acpi_bus_scan(ACPI_ROOT_OBJECT
);
2746 result
= acpi_bus_get_device(ACPI_ROOT_OBJECT
, &acpi_root
);
2750 /* Fixed feature devices do not exist on HW-reduced platform */
2751 if (!acpi_gbl_reduced_hardware
) {
2752 result
= acpi_bus_scan_fixed();
2754 acpi_detach_data(acpi_root
->handle
,
2755 acpi_scan_drop_device
);
2756 acpi_device_del(acpi_root
);
2757 put_device(&acpi_root
->dev
);
2762 acpi_update_all_gpes();
2765 mutex_unlock(&acpi_scan_lock
);