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 * create_pnp_modalias - Create hid/cid(s) string for modalias and uevent
119 * @acpi_dev: ACPI device object.
120 * @modalias: Buffer to print into.
121 * @size: Size of the buffer.
123 * Creates hid/cid(s) string needed for modalias and uevent
124 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
125 * char *modalias: "acpi:IBM0001:ACPI0001"
126 * Return: 0: no _HID and no _CID
127 * -EINVAL: output error
128 * -ENOMEM: output is truncated
130 static int create_pnp_modalias(struct acpi_device
*acpi_dev
, char *modalias
,
135 struct acpi_hardware_id
*id
;
138 * Since we skip PRP0001 from the modalias below, 0 should be returned
139 * if PRP0001 is the only ACPI/PNP ID in the device's list.
142 list_for_each_entry(id
, &acpi_dev
->pnp
.ids
, list
)
143 if (strcmp(id
->id
, "PRP0001"))
149 len
= snprintf(modalias
, size
, "acpi:");
155 list_for_each_entry(id
, &acpi_dev
->pnp
.ids
, list
) {
156 if (!strcmp(id
->id
, "PRP0001"))
159 count
= snprintf(&modalias
[len
], size
, "%s:", id
->id
);
169 modalias
[len
] = '\0';
174 * create_of_modalias - Creates DT compatible string for modalias and uevent
175 * @acpi_dev: ACPI device object.
176 * @modalias: Buffer to print into.
177 * @size: Size of the buffer.
179 * Expose DT compatible modalias as of:NnameTCcompatible. This function should
180 * only be called for devices having PRP0001 in their list of ACPI/PNP IDs.
182 static int create_of_modalias(struct acpi_device
*acpi_dev
, char *modalias
,
185 struct acpi_buffer buf
= { ACPI_ALLOCATE_BUFFER
};
186 const union acpi_object
*of_compatible
, *obj
;
191 acpi_get_name(acpi_dev
->handle
, ACPI_SINGLE_NAME
, &buf
);
192 /* DT strings are all in lower case */
193 for (c
= buf
.pointer
; *c
!= '\0'; c
++)
196 len
= snprintf(modalias
, size
, "of:N%sT", (char *)buf
.pointer
);
197 ACPI_FREE(buf
.pointer
);
202 of_compatible
= acpi_dev
->data
.of_compatible
;
203 if (of_compatible
->type
== ACPI_TYPE_PACKAGE
) {
204 nval
= of_compatible
->package
.count
;
205 obj
= of_compatible
->package
.elements
;
206 } else { /* Must be ACPI_TYPE_STRING. */
210 for (i
= 0; i
< nval
; i
++, obj
++) {
211 count
= snprintf(&modalias
[len
], size
, "C%s",
212 obj
->string
.pointer
);
222 modalias
[len
] = '\0';
227 * acpi_companion_match() - Can we match via ACPI companion device
228 * @dev: Device in question
230 * Check if the given device has an ACPI companion and if that companion has
231 * a valid list of PNP IDs, and if the device is the first (primary) physical
232 * device associated with it. Return the companion pointer if that's the case
235 * If multiple physical devices are attached to a single ACPI companion, we need
236 * to be careful. The usage scenario for this kind of relationship is that all
237 * of the physical devices in question use resources provided by the ACPI
238 * companion. A typical case is an MFD device where all the sub-devices share
239 * the parent's ACPI companion. In such cases we can only allow the primary
240 * (first) physical device to be matched with the help of the companion's PNP
243 * Additional physical devices sharing the ACPI companion can still use
244 * resources available from it but they will be matched normally using functions
245 * provided by their bus types (and analogously for their modalias).
247 static struct acpi_device
*acpi_companion_match(const struct device
*dev
)
249 struct acpi_device
*adev
;
250 struct mutex
*physical_node_lock
;
252 adev
= ACPI_COMPANION(dev
);
256 if (list_empty(&adev
->pnp
.ids
))
259 physical_node_lock
= &adev
->physical_node_lock
;
260 mutex_lock(physical_node_lock
);
261 if (list_empty(&adev
->physical_node_list
)) {
264 const struct acpi_device_physical_node
*node
;
266 node
= list_first_entry(&adev
->physical_node_list
,
267 struct acpi_device_physical_node
, node
);
268 if (node
->dev
!= dev
)
271 mutex_unlock(physical_node_lock
);
276 static int __acpi_device_uevent_modalias(struct acpi_device
*adev
,
277 struct kobj_uevent_env
*env
)
284 if (list_empty(&adev
->pnp
.ids
))
287 if (add_uevent_var(env
, "MODALIAS="))
290 len
= create_pnp_modalias(adev
, &env
->buf
[env
->buflen
- 1],
291 sizeof(env
->buf
) - env
->buflen
);
296 if (!adev
->data
.of_compatible
)
299 if (len
> 0 && add_uevent_var(env
, "MODALIAS="))
302 len
= create_of_modalias(adev
, &env
->buf
[env
->buflen
- 1],
303 sizeof(env
->buf
) - env
->buflen
);
313 * Creates uevent modalias field for ACPI enumerated devices.
314 * Because the other buses does not support ACPI HIDs & CIDs.
315 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
316 * "acpi:IBM0001:ACPI0001"
318 int acpi_device_uevent_modalias(struct device
*dev
, struct kobj_uevent_env
*env
)
320 return __acpi_device_uevent_modalias(acpi_companion_match(dev
), env
);
322 EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias
);
324 static int __acpi_device_modalias(struct acpi_device
*adev
, char *buf
, int size
)
331 if (list_empty(&adev
->pnp
.ids
))
334 len
= create_pnp_modalias(adev
, buf
, size
- 1);
337 } else if (len
> 0) {
341 if (!adev
->data
.of_compatible
)
344 count
= create_of_modalias(adev
, buf
+ len
, size
- 1);
347 } else if (count
> 0) {
356 * Creates modalias sysfs attribute for ACPI enumerated devices.
357 * Because the other buses does not support ACPI HIDs & CIDs.
358 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
359 * "acpi:IBM0001:ACPI0001"
361 int acpi_device_modalias(struct device
*dev
, char *buf
, int size
)
363 return __acpi_device_modalias(acpi_companion_match(dev
), buf
, size
);
365 EXPORT_SYMBOL_GPL(acpi_device_modalias
);
368 acpi_device_modalias_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
369 return __acpi_device_modalias(to_acpi_device(dev
), buf
, 1024);
371 static DEVICE_ATTR(modalias
, 0444, acpi_device_modalias_show
, NULL
);
373 bool acpi_scan_is_offline(struct acpi_device
*adev
, bool uevent
)
375 struct acpi_device_physical_node
*pn
;
378 mutex_lock(&adev
->physical_node_lock
);
380 list_for_each_entry(pn
, &adev
->physical_node_list
, node
)
381 if (device_supports_offline(pn
->dev
) && !pn
->dev
->offline
) {
383 kobject_uevent(&pn
->dev
->kobj
, KOBJ_CHANGE
);
389 mutex_unlock(&adev
->physical_node_lock
);
393 static acpi_status
acpi_bus_offline(acpi_handle handle
, u32 lvl
, void *data
,
396 struct acpi_device
*device
= NULL
;
397 struct acpi_device_physical_node
*pn
;
398 bool second_pass
= (bool)data
;
399 acpi_status status
= AE_OK
;
401 if (acpi_bus_get_device(handle
, &device
))
404 if (device
->handler
&& !device
->handler
->hotplug
.enabled
) {
405 *ret_p
= &device
->dev
;
409 mutex_lock(&device
->physical_node_lock
);
411 list_for_each_entry(pn
, &device
->physical_node_list
, node
) {
415 /* Skip devices offlined by the first pass. */
419 pn
->put_online
= false;
421 ret
= device_offline(pn
->dev
);
422 if (acpi_force_hot_remove
)
426 pn
->put_online
= !ret
;
436 mutex_unlock(&device
->physical_node_lock
);
441 static acpi_status
acpi_bus_online(acpi_handle handle
, u32 lvl
, void *data
,
444 struct acpi_device
*device
= NULL
;
445 struct acpi_device_physical_node
*pn
;
447 if (acpi_bus_get_device(handle
, &device
))
450 mutex_lock(&device
->physical_node_lock
);
452 list_for_each_entry(pn
, &device
->physical_node_list
, node
)
453 if (pn
->put_online
) {
454 device_online(pn
->dev
);
455 pn
->put_online
= false;
458 mutex_unlock(&device
->physical_node_lock
);
463 static int acpi_scan_try_to_offline(struct acpi_device
*device
)
465 acpi_handle handle
= device
->handle
;
466 struct device
*errdev
= NULL
;
470 * Carry out two passes here and ignore errors in the first pass,
471 * because if the devices in question are memory blocks and
472 * CONFIG_MEMCG is set, one of the blocks may hold data structures
473 * that the other blocks depend on, but it is not known in advance which
476 * If the first pass is successful, the second one isn't needed, though.
478 status
= acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
479 NULL
, acpi_bus_offline
, (void *)false,
481 if (status
== AE_SUPPORT
) {
482 dev_warn(errdev
, "Offline disabled.\n");
483 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
484 acpi_bus_online
, NULL
, NULL
, NULL
);
487 acpi_bus_offline(handle
, 0, (void *)false, (void **)&errdev
);
490 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
491 NULL
, acpi_bus_offline
, (void *)true,
493 if (!errdev
|| acpi_force_hot_remove
)
494 acpi_bus_offline(handle
, 0, (void *)true,
497 if (errdev
&& !acpi_force_hot_remove
) {
498 dev_warn(errdev
, "Offline failed.\n");
499 acpi_bus_online(handle
, 0, NULL
, NULL
);
500 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
,
501 ACPI_UINT32_MAX
, acpi_bus_online
,
509 static int acpi_scan_hot_remove(struct acpi_device
*device
)
511 acpi_handle handle
= device
->handle
;
512 unsigned long long sta
;
515 if (device
->handler
&& device
->handler
->hotplug
.demand_offline
516 && !acpi_force_hot_remove
) {
517 if (!acpi_scan_is_offline(device
, true))
520 int error
= acpi_scan_try_to_offline(device
);
525 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
526 "Hot-removing device %s...\n", dev_name(&device
->dev
)));
528 acpi_bus_trim(device
);
530 acpi_evaluate_lck(handle
, 0);
534 status
= acpi_evaluate_ej0(handle
);
535 if (status
== AE_NOT_FOUND
)
537 else if (ACPI_FAILURE(status
))
541 * Verify if eject was indeed successful. If not, log an error
542 * message. No need to call _OST since _EJ0 call was made OK.
544 status
= acpi_evaluate_integer(handle
, "_STA", NULL
, &sta
);
545 if (ACPI_FAILURE(status
)) {
546 acpi_handle_warn(handle
,
547 "Status check after eject failed (0x%x)\n", status
);
548 } else if (sta
& ACPI_STA_DEVICE_ENABLED
) {
549 acpi_handle_warn(handle
,
550 "Eject incomplete - status 0x%llx\n", sta
);
556 static int acpi_scan_device_not_present(struct acpi_device
*adev
)
558 if (!acpi_device_enumerated(adev
)) {
559 dev_warn(&adev
->dev
, "Still not present\n");
566 static int acpi_scan_device_check(struct acpi_device
*adev
)
570 acpi_bus_get_status(adev
);
571 if (adev
->status
.present
|| adev
->status
.functional
) {
573 * This function is only called for device objects for which
574 * matching scan handlers exist. The only situation in which
575 * the scan handler is not attached to this device object yet
576 * is when the device has just appeared (either it wasn't
577 * present at all before or it was removed and then added
581 dev_warn(&adev
->dev
, "Already enumerated\n");
584 error
= acpi_bus_scan(adev
->handle
);
586 dev_warn(&adev
->dev
, "Namespace scan failure\n");
589 if (!adev
->handler
) {
590 dev_warn(&adev
->dev
, "Enumeration failure\n");
594 error
= acpi_scan_device_not_present(adev
);
599 static int acpi_scan_bus_check(struct acpi_device
*adev
)
601 struct acpi_scan_handler
*handler
= adev
->handler
;
602 struct acpi_device
*child
;
605 acpi_bus_get_status(adev
);
606 if (!(adev
->status
.present
|| adev
->status
.functional
)) {
607 acpi_scan_device_not_present(adev
);
610 if (handler
&& handler
->hotplug
.scan_dependent
)
611 return handler
->hotplug
.scan_dependent(adev
);
613 error
= acpi_bus_scan(adev
->handle
);
615 dev_warn(&adev
->dev
, "Namespace scan failure\n");
618 list_for_each_entry(child
, &adev
->children
, node
) {
619 error
= acpi_scan_bus_check(child
);
626 static int acpi_generic_hotplug_event(struct acpi_device
*adev
, u32 type
)
629 case ACPI_NOTIFY_BUS_CHECK
:
630 return acpi_scan_bus_check(adev
);
631 case ACPI_NOTIFY_DEVICE_CHECK
:
632 return acpi_scan_device_check(adev
);
633 case ACPI_NOTIFY_EJECT_REQUEST
:
634 case ACPI_OST_EC_OSPM_EJECT
:
635 if (adev
->handler
&& !adev
->handler
->hotplug
.enabled
) {
636 dev_info(&adev
->dev
, "Eject disabled\n");
639 acpi_evaluate_ost(adev
->handle
, ACPI_NOTIFY_EJECT_REQUEST
,
640 ACPI_OST_SC_EJECT_IN_PROGRESS
, NULL
);
641 return acpi_scan_hot_remove(adev
);
646 void acpi_device_hotplug(struct acpi_device
*adev
, u32 src
)
648 u32 ost_code
= ACPI_OST_SC_NON_SPECIFIC_FAILURE
;
651 lock_device_hotplug();
652 mutex_lock(&acpi_scan_lock
);
655 * The device object's ACPI handle cannot become invalid as long as we
656 * are holding acpi_scan_lock, but it might have become invalid before
657 * that lock was acquired.
659 if (adev
->handle
== INVALID_ACPI_HANDLE
)
662 if (adev
->flags
.is_dock_station
) {
663 error
= dock_notify(adev
, src
);
664 } else if (adev
->flags
.hotplug_notify
) {
665 error
= acpi_generic_hotplug_event(adev
, src
);
666 if (error
== -EPERM
) {
667 ost_code
= ACPI_OST_SC_EJECT_NOT_SUPPORTED
;
671 int (*notify
)(struct acpi_device
*, u32
);
673 acpi_lock_hp_context();
674 notify
= adev
->hp
? adev
->hp
->notify
: NULL
;
675 acpi_unlock_hp_context();
677 * There may be additional notify handlers for device objects
678 * without the .event() callback, so ignore them here.
681 error
= notify(adev
, src
);
686 ost_code
= ACPI_OST_SC_SUCCESS
;
689 acpi_evaluate_ost(adev
->handle
, src
, ost_code
, NULL
);
692 acpi_bus_put_acpi_device(adev
);
693 mutex_unlock(&acpi_scan_lock
);
694 unlock_device_hotplug();
697 static ssize_t
real_power_state_show(struct device
*dev
,
698 struct device_attribute
*attr
, char *buf
)
700 struct acpi_device
*adev
= to_acpi_device(dev
);
704 ret
= acpi_device_get_power(adev
, &state
);
708 return sprintf(buf
, "%s\n", acpi_power_state_string(state
));
711 static DEVICE_ATTR(real_power_state
, 0444, real_power_state_show
, NULL
);
713 static ssize_t
power_state_show(struct device
*dev
,
714 struct device_attribute
*attr
, char *buf
)
716 struct acpi_device
*adev
= to_acpi_device(dev
);
718 return sprintf(buf
, "%s\n", acpi_power_state_string(adev
->power
.state
));
721 static DEVICE_ATTR(power_state
, 0444, power_state_show
, NULL
);
724 acpi_eject_store(struct device
*d
, struct device_attribute
*attr
,
725 const char *buf
, size_t count
)
727 struct acpi_device
*acpi_device
= to_acpi_device(d
);
728 acpi_object_type not_used
;
731 if (!count
|| buf
[0] != '1')
734 if ((!acpi_device
->handler
|| !acpi_device
->handler
->hotplug
.enabled
)
735 && !acpi_device
->driver
)
738 status
= acpi_get_type(acpi_device
->handle
, ¬_used
);
739 if (ACPI_FAILURE(status
) || !acpi_device
->flags
.ejectable
)
742 get_device(&acpi_device
->dev
);
743 status
= acpi_hotplug_schedule(acpi_device
, ACPI_OST_EC_OSPM_EJECT
);
744 if (ACPI_SUCCESS(status
))
747 put_device(&acpi_device
->dev
);
748 acpi_evaluate_ost(acpi_device
->handle
, ACPI_OST_EC_OSPM_EJECT
,
749 ACPI_OST_SC_NON_SPECIFIC_FAILURE
, NULL
);
750 return status
== AE_NO_MEMORY
? -ENOMEM
: -EAGAIN
;
753 static DEVICE_ATTR(eject
, 0200, NULL
, acpi_eject_store
);
756 acpi_device_hid_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
757 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
759 return sprintf(buf
, "%s\n", acpi_device_hid(acpi_dev
));
761 static DEVICE_ATTR(hid
, 0444, acpi_device_hid_show
, NULL
);
763 static ssize_t
acpi_device_uid_show(struct device
*dev
,
764 struct device_attribute
*attr
, char *buf
)
766 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
768 return sprintf(buf
, "%s\n", acpi_dev
->pnp
.unique_id
);
770 static DEVICE_ATTR(uid
, 0444, acpi_device_uid_show
, NULL
);
772 static ssize_t
acpi_device_adr_show(struct device
*dev
,
773 struct device_attribute
*attr
, char *buf
)
775 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
777 return sprintf(buf
, "0x%08x\n",
778 (unsigned int)(acpi_dev
->pnp
.bus_address
));
780 static DEVICE_ATTR(adr
, 0444, acpi_device_adr_show
, NULL
);
783 acpi_device_path_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
784 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
785 struct acpi_buffer path
= {ACPI_ALLOCATE_BUFFER
, NULL
};
788 result
= acpi_get_name(acpi_dev
->handle
, ACPI_FULL_PATHNAME
, &path
);
792 result
= sprintf(buf
, "%s\n", (char*)path
.pointer
);
797 static DEVICE_ATTR(path
, 0444, acpi_device_path_show
, NULL
);
799 /* sysfs file that shows description text from the ACPI _STR method */
800 static ssize_t
description_show(struct device
*dev
,
801 struct device_attribute
*attr
,
803 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
806 if (acpi_dev
->pnp
.str_obj
== NULL
)
810 * The _STR object contains a Unicode identifier for a device.
811 * We need to convert to utf-8 so it can be displayed.
813 result
= utf16s_to_utf8s(
814 (wchar_t *)acpi_dev
->pnp
.str_obj
->buffer
.pointer
,
815 acpi_dev
->pnp
.str_obj
->buffer
.length
,
816 UTF16_LITTLE_ENDIAN
, buf
,
819 buf
[result
++] = '\n';
823 static DEVICE_ATTR(description
, 0444, description_show
, NULL
);
826 acpi_device_sun_show(struct device
*dev
, struct device_attribute
*attr
,
828 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
830 unsigned long long sun
;
832 status
= acpi_evaluate_integer(acpi_dev
->handle
, "_SUN", NULL
, &sun
);
833 if (ACPI_FAILURE(status
))
836 return sprintf(buf
, "%llu\n", sun
);
838 static DEVICE_ATTR(sun
, 0444, acpi_device_sun_show
, NULL
);
840 static ssize_t
status_show(struct device
*dev
, struct device_attribute
*attr
,
842 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
844 unsigned long long sta
;
846 status
= acpi_evaluate_integer(acpi_dev
->handle
, "_STA", NULL
, &sta
);
847 if (ACPI_FAILURE(status
))
850 return sprintf(buf
, "%llu\n", sta
);
852 static DEVICE_ATTR_RO(status
);
854 static int acpi_device_setup_files(struct acpi_device
*dev
)
856 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
861 * Devices gotten from FADT don't have a "path" attribute
864 result
= device_create_file(&dev
->dev
, &dev_attr_path
);
869 if (!list_empty(&dev
->pnp
.ids
)) {
870 result
= device_create_file(&dev
->dev
, &dev_attr_hid
);
874 result
= device_create_file(&dev
->dev
, &dev_attr_modalias
);
880 * If device has _STR, 'description' file is created
882 if (acpi_has_method(dev
->handle
, "_STR")) {
883 status
= acpi_evaluate_object(dev
->handle
, "_STR",
885 if (ACPI_FAILURE(status
))
886 buffer
.pointer
= NULL
;
887 dev
->pnp
.str_obj
= buffer
.pointer
;
888 result
= device_create_file(&dev
->dev
, &dev_attr_description
);
893 if (dev
->pnp
.type
.bus_address
)
894 result
= device_create_file(&dev
->dev
, &dev_attr_adr
);
895 if (dev
->pnp
.unique_id
)
896 result
= device_create_file(&dev
->dev
, &dev_attr_uid
);
898 if (acpi_has_method(dev
->handle
, "_SUN")) {
899 result
= device_create_file(&dev
->dev
, &dev_attr_sun
);
904 if (acpi_has_method(dev
->handle
, "_STA")) {
905 result
= device_create_file(&dev
->dev
, &dev_attr_status
);
911 * If device has _EJ0, 'eject' file is created that is used to trigger
912 * hot-removal function from userland.
914 if (acpi_has_method(dev
->handle
, "_EJ0")) {
915 result
= device_create_file(&dev
->dev
, &dev_attr_eject
);
920 if (dev
->flags
.power_manageable
) {
921 result
= device_create_file(&dev
->dev
, &dev_attr_power_state
);
925 if (dev
->power
.flags
.power_resources
)
926 result
= device_create_file(&dev
->dev
,
927 &dev_attr_real_power_state
);
934 static void acpi_device_remove_files(struct acpi_device
*dev
)
936 if (dev
->flags
.power_manageable
) {
937 device_remove_file(&dev
->dev
, &dev_attr_power_state
);
938 if (dev
->power
.flags
.power_resources
)
939 device_remove_file(&dev
->dev
,
940 &dev_attr_real_power_state
);
944 * If device has _STR, remove 'description' file
946 if (acpi_has_method(dev
->handle
, "_STR")) {
947 kfree(dev
->pnp
.str_obj
);
948 device_remove_file(&dev
->dev
, &dev_attr_description
);
951 * If device has _EJ0, remove 'eject' file.
953 if (acpi_has_method(dev
->handle
, "_EJ0"))
954 device_remove_file(&dev
->dev
, &dev_attr_eject
);
956 if (acpi_has_method(dev
->handle
, "_SUN"))
957 device_remove_file(&dev
->dev
, &dev_attr_sun
);
959 if (dev
->pnp
.unique_id
)
960 device_remove_file(&dev
->dev
, &dev_attr_uid
);
961 if (dev
->pnp
.type
.bus_address
)
962 device_remove_file(&dev
->dev
, &dev_attr_adr
);
963 device_remove_file(&dev
->dev
, &dev_attr_modalias
);
964 device_remove_file(&dev
->dev
, &dev_attr_hid
);
965 if (acpi_has_method(dev
->handle
, "_STA"))
966 device_remove_file(&dev
->dev
, &dev_attr_status
);
968 device_remove_file(&dev
->dev
, &dev_attr_path
);
970 /* --------------------------------------------------------------------------
972 -------------------------------------------------------------------------- */
975 * acpi_of_match_device - Match device object using the "compatible" property.
976 * @adev: ACPI device object to match.
977 * @of_match_table: List of device IDs to match against.
979 * If @dev has an ACPI companion which has the special PRP0001 device ID in its
980 * list of identifiers and a _DSD object with the "compatible" property, use
981 * that property to match against the given list of identifiers.
983 static bool acpi_of_match_device(struct acpi_device
*adev
,
984 const struct of_device_id
*of_match_table
)
986 const union acpi_object
*of_compatible
, *obj
;
992 of_compatible
= adev
->data
.of_compatible
;
993 if (!of_match_table
|| !of_compatible
)
996 if (of_compatible
->type
== ACPI_TYPE_PACKAGE
) {
997 nval
= of_compatible
->package
.count
;
998 obj
= of_compatible
->package
.elements
;
999 } else { /* Must be ACPI_TYPE_STRING. */
1001 obj
= of_compatible
;
1003 /* Now we can look for the driver DT compatible strings */
1004 for (i
= 0; i
< nval
; i
++, obj
++) {
1005 const struct of_device_id
*id
;
1007 for (id
= of_match_table
; id
->compatible
[0]; id
++)
1008 if (!strcasecmp(obj
->string
.pointer
, id
->compatible
))
1015 static const struct acpi_device_id
*__acpi_match_device(
1016 struct acpi_device
*device
,
1017 const struct acpi_device_id
*ids
,
1018 const struct of_device_id
*of_ids
)
1020 const struct acpi_device_id
*id
;
1021 struct acpi_hardware_id
*hwid
;
1024 * If the device is not present, it is unnecessary to load device
1027 if (!device
|| !device
->status
.present
)
1030 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
) {
1031 /* First, check the ACPI/PNP IDs provided by the caller. */
1032 for (id
= ids
; id
->id
[0]; id
++)
1033 if (!strcmp((char *) id
->id
, hwid
->id
))
1037 * Next, check the special "PRP0001" ID and try to match the
1038 * "compatible" property if found.
1040 * The id returned by the below is not valid, but the only
1041 * caller passing non-NULL of_ids here is only interested in
1042 * whether or not the return value is NULL.
1044 if (!strcmp("PRP0001", hwid
->id
)
1045 && acpi_of_match_device(device
, of_ids
))
1052 * acpi_match_device - Match a struct device against a given list of ACPI IDs
1053 * @ids: Array of struct acpi_device_id object to match against.
1054 * @dev: The device structure to match.
1056 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
1057 * object for that handle and use that object to match against a given list of
1060 * Return a pointer to the first matching ID on success or %NULL on failure.
1062 const struct acpi_device_id
*acpi_match_device(const struct acpi_device_id
*ids
,
1063 const struct device
*dev
)
1065 return __acpi_match_device(acpi_companion_match(dev
), ids
, NULL
);
1067 EXPORT_SYMBOL_GPL(acpi_match_device
);
1069 int acpi_match_device_ids(struct acpi_device
*device
,
1070 const struct acpi_device_id
*ids
)
1072 return __acpi_match_device(device
, ids
, NULL
) ? 0 : -ENOENT
;
1074 EXPORT_SYMBOL(acpi_match_device_ids
);
1076 bool acpi_driver_match_device(struct device
*dev
,
1077 const struct device_driver
*drv
)
1079 if (!drv
->acpi_match_table
)
1080 return acpi_of_match_device(ACPI_COMPANION(dev
),
1081 drv
->of_match_table
);
1083 return !!__acpi_match_device(acpi_companion_match(dev
),
1084 drv
->acpi_match_table
, drv
->of_match_table
);
1086 EXPORT_SYMBOL_GPL(acpi_driver_match_device
);
1088 static void acpi_free_power_resources_lists(struct acpi_device
*device
)
1092 if (device
->wakeup
.flags
.valid
)
1093 acpi_power_resources_list_free(&device
->wakeup
.resources
);
1095 if (!device
->power
.flags
.power_resources
)
1098 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3_HOT
; i
++) {
1099 struct acpi_device_power_state
*ps
= &device
->power
.states
[i
];
1100 acpi_power_resources_list_free(&ps
->resources
);
1104 static void acpi_device_release(struct device
*dev
)
1106 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
1108 acpi_free_properties(acpi_dev
);
1109 acpi_free_pnp_ids(&acpi_dev
->pnp
);
1110 acpi_free_power_resources_lists(acpi_dev
);
1114 static int acpi_bus_match(struct device
*dev
, struct device_driver
*drv
)
1116 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
1117 struct acpi_driver
*acpi_drv
= to_acpi_driver(drv
);
1119 return acpi_dev
->flags
.match_driver
1120 && !acpi_match_device_ids(acpi_dev
, acpi_drv
->ids
);
1123 static int acpi_device_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
1125 return __acpi_device_uevent_modalias(to_acpi_device(dev
), env
);
1128 static void acpi_device_notify(acpi_handle handle
, u32 event
, void *data
)
1130 struct acpi_device
*device
= data
;
1132 device
->driver
->ops
.notify(device
, event
);
1135 static void acpi_device_notify_fixed(void *data
)
1137 struct acpi_device
*device
= data
;
1139 /* Fixed hardware devices have no handles */
1140 acpi_device_notify(NULL
, ACPI_FIXED_HARDWARE_EVENT
, device
);
1143 static u32
acpi_device_fixed_event(void *data
)
1145 acpi_os_execute(OSL_NOTIFY_HANDLER
, acpi_device_notify_fixed
, data
);
1146 return ACPI_INTERRUPT_HANDLED
;
1149 static int acpi_device_install_notify_handler(struct acpi_device
*device
)
1153 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
1155 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
1156 acpi_device_fixed_event
,
1158 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
1160 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
1161 acpi_device_fixed_event
,
1164 status
= acpi_install_notify_handler(device
->handle
,
1169 if (ACPI_FAILURE(status
))
1174 static void acpi_device_remove_notify_handler(struct acpi_device
*device
)
1176 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
1177 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
1178 acpi_device_fixed_event
);
1179 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
1180 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
1181 acpi_device_fixed_event
);
1183 acpi_remove_notify_handler(device
->handle
, ACPI_DEVICE_NOTIFY
,
1184 acpi_device_notify
);
1187 static int acpi_device_probe(struct device
*dev
)
1189 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
1190 struct acpi_driver
*acpi_drv
= to_acpi_driver(dev
->driver
);
1193 if (acpi_dev
->handler
&& !acpi_is_pnp_device(acpi_dev
))
1196 if (!acpi_drv
->ops
.add
)
1199 ret
= acpi_drv
->ops
.add(acpi_dev
);
1203 acpi_dev
->driver
= acpi_drv
;
1204 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1205 "Driver [%s] successfully bound to device [%s]\n",
1206 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
1208 if (acpi_drv
->ops
.notify
) {
1209 ret
= acpi_device_install_notify_handler(acpi_dev
);
1211 if (acpi_drv
->ops
.remove
)
1212 acpi_drv
->ops
.remove(acpi_dev
);
1214 acpi_dev
->driver
= NULL
;
1215 acpi_dev
->driver_data
= NULL
;
1220 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found driver [%s] for device [%s]\n",
1221 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
1226 static int acpi_device_remove(struct device
* dev
)
1228 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
1229 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
1232 if (acpi_drv
->ops
.notify
)
1233 acpi_device_remove_notify_handler(acpi_dev
);
1234 if (acpi_drv
->ops
.remove
)
1235 acpi_drv
->ops
.remove(acpi_dev
);
1237 acpi_dev
->driver
= NULL
;
1238 acpi_dev
->driver_data
= NULL
;
1244 struct bus_type acpi_bus_type
= {
1246 .match
= acpi_bus_match
,
1247 .probe
= acpi_device_probe
,
1248 .remove
= acpi_device_remove
,
1249 .uevent
= acpi_device_uevent
,
1252 static void acpi_device_del(struct acpi_device
*device
)
1254 mutex_lock(&acpi_device_lock
);
1256 list_del(&device
->node
);
1258 list_del(&device
->wakeup_list
);
1259 mutex_unlock(&acpi_device_lock
);
1261 acpi_power_add_remove_device(device
, false);
1262 acpi_device_remove_files(device
);
1264 device
->remove(device
);
1266 device_del(&device
->dev
);
1269 static LIST_HEAD(acpi_device_del_list
);
1270 static DEFINE_MUTEX(acpi_device_del_lock
);
1272 static void acpi_device_del_work_fn(struct work_struct
*work_not_used
)
1275 struct acpi_device
*adev
;
1277 mutex_lock(&acpi_device_del_lock
);
1279 if (list_empty(&acpi_device_del_list
)) {
1280 mutex_unlock(&acpi_device_del_lock
);
1283 adev
= list_first_entry(&acpi_device_del_list
,
1284 struct acpi_device
, del_list
);
1285 list_del(&adev
->del_list
);
1287 mutex_unlock(&acpi_device_del_lock
);
1289 acpi_device_del(adev
);
1291 * Drop references to all power resources that might have been
1292 * used by the device.
1294 acpi_power_transition(adev
, ACPI_STATE_D3_COLD
);
1295 put_device(&adev
->dev
);
1300 * acpi_scan_drop_device - Drop an ACPI device object.
1301 * @handle: Handle of an ACPI namespace node, not used.
1302 * @context: Address of the ACPI device object to drop.
1304 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
1305 * namespace node the device object pointed to by @context is attached to.
1307 * The unregistration is carried out asynchronously to avoid running
1308 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
1309 * ensure the correct ordering (the device objects must be unregistered in the
1310 * same order in which the corresponding namespace nodes are deleted).
1312 static void acpi_scan_drop_device(acpi_handle handle
, void *context
)
1314 static DECLARE_WORK(work
, acpi_device_del_work_fn
);
1315 struct acpi_device
*adev
= context
;
1317 mutex_lock(&acpi_device_del_lock
);
1320 * Use the ACPI hotplug workqueue which is ordered, so this work item
1321 * won't run after any hotplug work items submitted subsequently. That
1322 * prevents attempts to register device objects identical to those being
1323 * deleted from happening concurrently (such attempts result from
1324 * hotplug events handled via the ACPI hotplug workqueue). It also will
1325 * run after all of the work items submitted previosuly, which helps
1326 * those work items to ensure that they are not accessing stale device
1329 if (list_empty(&acpi_device_del_list
))
1330 acpi_queue_hotplug_work(&work
);
1332 list_add_tail(&adev
->del_list
, &acpi_device_del_list
);
1333 /* Make acpi_ns_validate_handle() return NULL for this handle. */
1334 adev
->handle
= INVALID_ACPI_HANDLE
;
1336 mutex_unlock(&acpi_device_del_lock
);
1339 static int acpi_get_device_data(acpi_handle handle
, struct acpi_device
**device
,
1340 void (*callback
)(void *))
1347 status
= acpi_get_data_full(handle
, acpi_scan_drop_device
,
1348 (void **)device
, callback
);
1349 if (ACPI_FAILURE(status
) || !*device
) {
1350 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "No context for object [%p]\n",
1357 int acpi_bus_get_device(acpi_handle handle
, struct acpi_device
**device
)
1359 return acpi_get_device_data(handle
, device
, NULL
);
1361 EXPORT_SYMBOL(acpi_bus_get_device
);
1363 static void get_acpi_device(void *dev
)
1366 get_device(&((struct acpi_device
*)dev
)->dev
);
1369 struct acpi_device
*acpi_bus_get_acpi_device(acpi_handle handle
)
1371 struct acpi_device
*adev
= NULL
;
1373 acpi_get_device_data(handle
, &adev
, get_acpi_device
);
1377 void acpi_bus_put_acpi_device(struct acpi_device
*adev
)
1379 put_device(&adev
->dev
);
1382 int acpi_device_add(struct acpi_device
*device
,
1383 void (*release
)(struct device
*))
1386 struct acpi_device_bus_id
*acpi_device_bus_id
, *new_bus_id
;
1389 if (device
->handle
) {
1392 status
= acpi_attach_data(device
->handle
, acpi_scan_drop_device
,
1394 if (ACPI_FAILURE(status
)) {
1395 acpi_handle_err(device
->handle
,
1396 "Unable to attach device data\n");
1404 * Link this device to its parent and siblings.
1406 INIT_LIST_HEAD(&device
->children
);
1407 INIT_LIST_HEAD(&device
->node
);
1408 INIT_LIST_HEAD(&device
->wakeup_list
);
1409 INIT_LIST_HEAD(&device
->physical_node_list
);
1410 INIT_LIST_HEAD(&device
->del_list
);
1411 mutex_init(&device
->physical_node_lock
);
1413 new_bus_id
= kzalloc(sizeof(struct acpi_device_bus_id
), GFP_KERNEL
);
1415 pr_err(PREFIX
"Memory allocation error\n");
1420 mutex_lock(&acpi_device_lock
);
1422 * Find suitable bus_id and instance number in acpi_bus_id_list
1423 * If failed, create one and link it into acpi_bus_id_list
1425 list_for_each_entry(acpi_device_bus_id
, &acpi_bus_id_list
, node
) {
1426 if (!strcmp(acpi_device_bus_id
->bus_id
,
1427 acpi_device_hid(device
))) {
1428 acpi_device_bus_id
->instance_no
++;
1435 acpi_device_bus_id
= new_bus_id
;
1436 strcpy(acpi_device_bus_id
->bus_id
, acpi_device_hid(device
));
1437 acpi_device_bus_id
->instance_no
= 0;
1438 list_add_tail(&acpi_device_bus_id
->node
, &acpi_bus_id_list
);
1440 dev_set_name(&device
->dev
, "%s:%02x", acpi_device_bus_id
->bus_id
, acpi_device_bus_id
->instance_no
);
1443 list_add_tail(&device
->node
, &device
->parent
->children
);
1445 if (device
->wakeup
.flags
.valid
)
1446 list_add_tail(&device
->wakeup_list
, &acpi_wakeup_device_list
);
1447 mutex_unlock(&acpi_device_lock
);
1450 device
->dev
.parent
= &device
->parent
->dev
;
1451 device
->dev
.bus
= &acpi_bus_type
;
1452 device
->dev
.release
= release
;
1453 result
= device_add(&device
->dev
);
1455 dev_err(&device
->dev
, "Error registering device\n");
1459 result
= acpi_device_setup_files(device
);
1461 printk(KERN_ERR PREFIX
"Error creating sysfs interface for device %s\n",
1462 dev_name(&device
->dev
));
1467 mutex_lock(&acpi_device_lock
);
1469 list_del(&device
->node
);
1470 list_del(&device
->wakeup_list
);
1471 mutex_unlock(&acpi_device_lock
);
1474 acpi_detach_data(device
->handle
, acpi_scan_drop_device
);
1478 struct acpi_device
*acpi_get_next_child(struct device
*dev
,
1479 struct acpi_device
*child
)
1481 struct acpi_device
*adev
= ACPI_COMPANION(dev
);
1482 struct list_head
*head
, *next
;
1487 head
= &adev
->children
;
1488 if (list_empty(head
))
1492 return list_first_entry(head
, struct acpi_device
, node
);
1494 next
= child
->node
.next
;
1495 return next
== head
? NULL
: list_entry(next
, struct acpi_device
, node
);
1498 /* --------------------------------------------------------------------------
1500 -------------------------------------------------------------------------- */
1502 * acpi_bus_register_driver - register a driver with the ACPI bus
1503 * @driver: driver being registered
1505 * Registers a driver with the ACPI bus. Searches the namespace for all
1506 * devices that match the driver's criteria and binds. Returns zero for
1507 * success or a negative error status for failure.
1509 int acpi_bus_register_driver(struct acpi_driver
*driver
)
1515 driver
->drv
.name
= driver
->name
;
1516 driver
->drv
.bus
= &acpi_bus_type
;
1517 driver
->drv
.owner
= driver
->owner
;
1519 ret
= driver_register(&driver
->drv
);
1523 EXPORT_SYMBOL(acpi_bus_register_driver
);
1526 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1527 * @driver: driver to unregister
1529 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1530 * devices that match the driver's criteria and unbinds.
1532 void acpi_bus_unregister_driver(struct acpi_driver
*driver
)
1534 driver_unregister(&driver
->drv
);
1537 EXPORT_SYMBOL(acpi_bus_unregister_driver
);
1539 /* --------------------------------------------------------------------------
1541 -------------------------------------------------------------------------- */
1542 static struct acpi_device
*acpi_bus_get_parent(acpi_handle handle
)
1544 struct acpi_device
*device
= NULL
;
1548 * Fixed hardware devices do not appear in the namespace and do not
1549 * have handles, but we fabricate acpi_devices for them, so we have
1550 * to deal with them specially.
1556 status
= acpi_get_parent(handle
, &handle
);
1557 if (ACPI_FAILURE(status
))
1558 return status
== AE_NULL_ENTRY
? NULL
: acpi_root
;
1559 } while (acpi_bus_get_device(handle
, &device
));
1564 acpi_bus_get_ejd(acpi_handle handle
, acpi_handle
*ejd
)
1568 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
1569 union acpi_object
*obj
;
1571 status
= acpi_get_handle(handle
, "_EJD", &tmp
);
1572 if (ACPI_FAILURE(status
))
1575 status
= acpi_evaluate_object(handle
, "_EJD", NULL
, &buffer
);
1576 if (ACPI_SUCCESS(status
)) {
1577 obj
= buffer
.pointer
;
1578 status
= acpi_get_handle(ACPI_ROOT_OBJECT
, obj
->string
.pointer
,
1580 kfree(buffer
.pointer
);
1584 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd
);
1586 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle
,
1587 struct acpi_device_wakeup
*wakeup
)
1589 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1590 union acpi_object
*package
= NULL
;
1591 union acpi_object
*element
= NULL
;
1598 INIT_LIST_HEAD(&wakeup
->resources
);
1601 status
= acpi_evaluate_object(handle
, "_PRW", NULL
, &buffer
);
1602 if (ACPI_FAILURE(status
)) {
1603 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRW"));
1607 package
= (union acpi_object
*)buffer
.pointer
;
1609 if (!package
|| package
->package
.count
< 2)
1612 element
= &(package
->package
.elements
[0]);
1616 if (element
->type
== ACPI_TYPE_PACKAGE
) {
1617 if ((element
->package
.count
< 2) ||
1618 (element
->package
.elements
[0].type
!=
1619 ACPI_TYPE_LOCAL_REFERENCE
)
1620 || (element
->package
.elements
[1].type
!= ACPI_TYPE_INTEGER
))
1623 wakeup
->gpe_device
=
1624 element
->package
.elements
[0].reference
.handle
;
1625 wakeup
->gpe_number
=
1626 (u32
) element
->package
.elements
[1].integer
.value
;
1627 } else if (element
->type
== ACPI_TYPE_INTEGER
) {
1628 wakeup
->gpe_device
= NULL
;
1629 wakeup
->gpe_number
= element
->integer
.value
;
1634 element
= &(package
->package
.elements
[1]);
1635 if (element
->type
!= ACPI_TYPE_INTEGER
)
1638 wakeup
->sleep_state
= element
->integer
.value
;
1640 err
= acpi_extract_power_resources(package
, 2, &wakeup
->resources
);
1644 if (!list_empty(&wakeup
->resources
)) {
1647 err
= acpi_power_wakeup_list_init(&wakeup
->resources
,
1650 acpi_handle_warn(handle
, "Retrieving current states "
1651 "of wakeup power resources failed\n");
1652 acpi_power_resources_list_free(&wakeup
->resources
);
1655 if (sleep_state
< wakeup
->sleep_state
) {
1656 acpi_handle_warn(handle
, "Overriding _PRW sleep state "
1657 "(S%d) by S%d from power resources\n",
1658 (int)wakeup
->sleep_state
, sleep_state
);
1659 wakeup
->sleep_state
= sleep_state
;
1664 kfree(buffer
.pointer
);
1668 static void acpi_wakeup_gpe_init(struct acpi_device
*device
)
1670 struct acpi_device_id button_device_ids
[] = {
1676 struct acpi_device_wakeup
*wakeup
= &device
->wakeup
;
1678 acpi_event_status event_status
;
1680 wakeup
->flags
.notifier_present
= 0;
1682 /* Power button, Lid switch always enable wakeup */
1683 if (!acpi_match_device_ids(device
, button_device_ids
)) {
1684 wakeup
->flags
.run_wake
= 1;
1685 if (!acpi_match_device_ids(device
, &button_device_ids
[1])) {
1686 /* Do not use Lid/sleep button for S5 wakeup */
1687 if (wakeup
->sleep_state
== ACPI_STATE_S5
)
1688 wakeup
->sleep_state
= ACPI_STATE_S4
;
1690 acpi_mark_gpe_for_wake(wakeup
->gpe_device
, wakeup
->gpe_number
);
1691 device_set_wakeup_capable(&device
->dev
, true);
1695 acpi_setup_gpe_for_wake(device
->handle
, wakeup
->gpe_device
,
1696 wakeup
->gpe_number
);
1697 status
= acpi_get_gpe_status(wakeup
->gpe_device
, wakeup
->gpe_number
,
1699 if (ACPI_FAILURE(status
))
1702 wakeup
->flags
.run_wake
= !!(event_status
& ACPI_EVENT_FLAG_HAS_HANDLER
);
1705 static void acpi_bus_get_wakeup_device_flags(struct acpi_device
*device
)
1709 /* Presence of _PRW indicates wake capable */
1710 if (!acpi_has_method(device
->handle
, "_PRW"))
1713 err
= acpi_bus_extract_wakeup_device_power_package(device
->handle
,
1716 dev_err(&device
->dev
, "_PRW evaluation error: %d\n", err
);
1720 device
->wakeup
.flags
.valid
= 1;
1721 device
->wakeup
.prepare_count
= 0;
1722 acpi_wakeup_gpe_init(device
);
1723 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1724 * system for the ACPI device with the _PRW object.
1725 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1726 * So it is necessary to call _DSW object first. Only when it is not
1727 * present will the _PSW object used.
1729 err
= acpi_device_sleep_wake(device
, 0, 0, 0);
1731 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1732 "error in _DSW or _PSW evaluation\n"));
1735 static void acpi_bus_init_power_state(struct acpi_device
*device
, int state
)
1737 struct acpi_device_power_state
*ps
= &device
->power
.states
[state
];
1738 char pathname
[5] = { '_', 'P', 'R', '0' + state
, '\0' };
1739 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1742 INIT_LIST_HEAD(&ps
->resources
);
1744 /* Evaluate "_PRx" to get referenced power resources */
1745 status
= acpi_evaluate_object(device
->handle
, pathname
, NULL
, &buffer
);
1746 if (ACPI_SUCCESS(status
)) {
1747 union acpi_object
*package
= buffer
.pointer
;
1749 if (buffer
.length
&& package
1750 && package
->type
== ACPI_TYPE_PACKAGE
1751 && package
->package
.count
) {
1752 int err
= acpi_extract_power_resources(package
, 0,
1755 device
->power
.flags
.power_resources
= 1;
1757 ACPI_FREE(buffer
.pointer
);
1760 /* Evaluate "_PSx" to see if we can do explicit sets */
1762 if (acpi_has_method(device
->handle
, pathname
))
1763 ps
->flags
.explicit_set
= 1;
1766 * State is valid if there are means to put the device into it.
1767 * D3hot is only valid if _PR3 present.
1769 if (!list_empty(&ps
->resources
)
1770 || (ps
->flags
.explicit_set
&& state
< ACPI_STATE_D3_HOT
)) {
1771 ps
->flags
.valid
= 1;
1772 ps
->flags
.os_accessible
= 1;
1775 ps
->power
= -1; /* Unknown - driver assigned */
1776 ps
->latency
= -1; /* Unknown - driver assigned */
1779 static void acpi_bus_get_power_flags(struct acpi_device
*device
)
1783 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1784 if (!acpi_has_method(device
->handle
, "_PS0") &&
1785 !acpi_has_method(device
->handle
, "_PR0"))
1788 device
->flags
.power_manageable
= 1;
1791 * Power Management Flags
1793 if (acpi_has_method(device
->handle
, "_PSC"))
1794 device
->power
.flags
.explicit_get
= 1;
1796 if (acpi_has_method(device
->handle
, "_IRC"))
1797 device
->power
.flags
.inrush_current
= 1;
1799 if (acpi_has_method(device
->handle
, "_DSW"))
1800 device
->power
.flags
.dsw_present
= 1;
1803 * Enumerate supported power management states
1805 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3_HOT
; i
++)
1806 acpi_bus_init_power_state(device
, i
);
1808 INIT_LIST_HEAD(&device
->power
.states
[ACPI_STATE_D3_COLD
].resources
);
1810 /* Set defaults for D0 and D3 states (always valid) */
1811 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
= 1;
1812 device
->power
.states
[ACPI_STATE_D0
].power
= 100;
1813 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.valid
= 1;
1814 device
->power
.states
[ACPI_STATE_D3_COLD
].power
= 0;
1816 /* Set D3cold's explicit_set flag if _PS3 exists. */
1817 if (device
->power
.states
[ACPI_STATE_D3_HOT
].flags
.explicit_set
)
1818 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.explicit_set
= 1;
1820 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1821 if (device
->power
.states
[ACPI_STATE_D3_HOT
].flags
.explicit_set
||
1822 device
->power
.flags
.power_resources
)
1823 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.os_accessible
= 1;
1825 if (acpi_bus_init_power(device
))
1826 device
->flags
.power_manageable
= 0;
1829 static void acpi_bus_get_flags(struct acpi_device
*device
)
1831 /* Presence of _STA indicates 'dynamic_status' */
1832 if (acpi_has_method(device
->handle
, "_STA"))
1833 device
->flags
.dynamic_status
= 1;
1835 /* Presence of _RMV indicates 'removable' */
1836 if (acpi_has_method(device
->handle
, "_RMV"))
1837 device
->flags
.removable
= 1;
1839 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1840 if (acpi_has_method(device
->handle
, "_EJD") ||
1841 acpi_has_method(device
->handle
, "_EJ0"))
1842 device
->flags
.ejectable
= 1;
1845 static void acpi_device_get_busid(struct acpi_device
*device
)
1847 char bus_id
[5] = { '?', 0 };
1848 struct acpi_buffer buffer
= { sizeof(bus_id
), bus_id
};
1854 * The device's Bus ID is simply the object name.
1855 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1857 if (ACPI_IS_ROOT_DEVICE(device
)) {
1858 strcpy(device
->pnp
.bus_id
, "ACPI");
1862 switch (device
->device_type
) {
1863 case ACPI_BUS_TYPE_POWER_BUTTON
:
1864 strcpy(device
->pnp
.bus_id
, "PWRF");
1866 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1867 strcpy(device
->pnp
.bus_id
, "SLPF");
1870 acpi_get_name(device
->handle
, ACPI_SINGLE_NAME
, &buffer
);
1871 /* Clean up trailing underscores (if any) */
1872 for (i
= 3; i
> 1; i
--) {
1873 if (bus_id
[i
] == '_')
1878 strcpy(device
->pnp
.bus_id
, bus_id
);
1884 * acpi_ata_match - see if an acpi object is an ATA device
1886 * If an acpi object has one of the ACPI ATA methods defined,
1887 * then we can safely call it an ATA device.
1889 bool acpi_ata_match(acpi_handle handle
)
1891 return acpi_has_method(handle
, "_GTF") ||
1892 acpi_has_method(handle
, "_GTM") ||
1893 acpi_has_method(handle
, "_STM") ||
1894 acpi_has_method(handle
, "_SDD");
1898 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1900 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1901 * then we can safely call it an ejectable drive bay
1903 bool acpi_bay_match(acpi_handle handle
)
1905 acpi_handle phandle
;
1907 if (!acpi_has_method(handle
, "_EJ0"))
1909 if (acpi_ata_match(handle
))
1911 if (ACPI_FAILURE(acpi_get_parent(handle
, &phandle
)))
1914 return acpi_ata_match(phandle
);
1917 bool acpi_device_is_battery(struct acpi_device
*adev
)
1919 struct acpi_hardware_id
*hwid
;
1921 list_for_each_entry(hwid
, &adev
->pnp
.ids
, list
)
1922 if (!strcmp("PNP0C0A", hwid
->id
))
1928 static bool is_ejectable_bay(struct acpi_device
*adev
)
1930 acpi_handle handle
= adev
->handle
;
1932 if (acpi_has_method(handle
, "_EJ0") && acpi_device_is_battery(adev
))
1935 return acpi_bay_match(handle
);
1939 * acpi_dock_match - see if an acpi object has a _DCK method
1941 bool acpi_dock_match(acpi_handle handle
)
1943 return acpi_has_method(handle
, "_DCK");
1946 const char *acpi_device_hid(struct acpi_device
*device
)
1948 struct acpi_hardware_id
*hid
;
1950 if (list_empty(&device
->pnp
.ids
))
1953 hid
= list_first_entry(&device
->pnp
.ids
, struct acpi_hardware_id
, list
);
1956 EXPORT_SYMBOL(acpi_device_hid
);
1958 static void acpi_add_id(struct acpi_device_pnp
*pnp
, const char *dev_id
)
1960 struct acpi_hardware_id
*id
;
1962 id
= kmalloc(sizeof(*id
), GFP_KERNEL
);
1966 id
->id
= kstrdup(dev_id
, GFP_KERNEL
);
1972 list_add_tail(&id
->list
, &pnp
->ids
);
1973 pnp
->type
.hardware_id
= 1;
1977 * Old IBM workstations have a DSDT bug wherein the SMBus object
1978 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1979 * prefix. Work around this.
1981 static bool acpi_ibm_smbus_match(acpi_handle handle
)
1983 char node_name
[ACPI_PATH_SEGMENT_LENGTH
];
1984 struct acpi_buffer path
= { sizeof(node_name
), node_name
};
1986 if (!dmi_name_in_vendors("IBM"))
1989 /* Look for SMBS object */
1990 if (ACPI_FAILURE(acpi_get_name(handle
, ACPI_SINGLE_NAME
, &path
)) ||
1991 strcmp("SMBS", path
.pointer
))
1994 /* Does it have the necessary (but misnamed) methods? */
1995 if (acpi_has_method(handle
, "SBI") &&
1996 acpi_has_method(handle
, "SBR") &&
1997 acpi_has_method(handle
, "SBW"))
2003 static bool acpi_object_is_system_bus(acpi_handle handle
)
2007 if (ACPI_SUCCESS(acpi_get_handle(NULL
, "\\_SB", &tmp
)) &&
2010 if (ACPI_SUCCESS(acpi_get_handle(NULL
, "\\_TZ", &tmp
)) &&
2017 static void acpi_set_pnp_ids(acpi_handle handle
, struct acpi_device_pnp
*pnp
,
2021 struct acpi_device_info
*info
;
2022 struct acpi_pnp_device_id_list
*cid_list
;
2025 switch (device_type
) {
2026 case ACPI_BUS_TYPE_DEVICE
:
2027 if (handle
== ACPI_ROOT_OBJECT
) {
2028 acpi_add_id(pnp
, ACPI_SYSTEM_HID
);
2032 status
= acpi_get_object_info(handle
, &info
);
2033 if (ACPI_FAILURE(status
)) {
2034 pr_err(PREFIX
"%s: Error reading device info\n",
2039 if (info
->valid
& ACPI_VALID_HID
) {
2040 acpi_add_id(pnp
, info
->hardware_id
.string
);
2041 pnp
->type
.platform_id
= 1;
2043 if (info
->valid
& ACPI_VALID_CID
) {
2044 cid_list
= &info
->compatible_id_list
;
2045 for (i
= 0; i
< cid_list
->count
; i
++)
2046 acpi_add_id(pnp
, cid_list
->ids
[i
].string
);
2048 if (info
->valid
& ACPI_VALID_ADR
) {
2049 pnp
->bus_address
= info
->address
;
2050 pnp
->type
.bus_address
= 1;
2052 if (info
->valid
& ACPI_VALID_UID
)
2053 pnp
->unique_id
= kstrdup(info
->unique_id
.string
,
2059 * Some devices don't reliably have _HIDs & _CIDs, so add
2060 * synthetic HIDs to make sure drivers can find them.
2062 if (acpi_is_video_device(handle
))
2063 acpi_add_id(pnp
, ACPI_VIDEO_HID
);
2064 else if (acpi_bay_match(handle
))
2065 acpi_add_id(pnp
, ACPI_BAY_HID
);
2066 else if (acpi_dock_match(handle
))
2067 acpi_add_id(pnp
, ACPI_DOCK_HID
);
2068 else if (acpi_ibm_smbus_match(handle
))
2069 acpi_add_id(pnp
, ACPI_SMBUS_IBM_HID
);
2070 else if (list_empty(&pnp
->ids
) &&
2071 acpi_object_is_system_bus(handle
)) {
2072 /* \_SB, \_TZ, LNXSYBUS */
2073 acpi_add_id(pnp
, ACPI_BUS_HID
);
2074 strcpy(pnp
->device_name
, ACPI_BUS_DEVICE_NAME
);
2075 strcpy(pnp
->device_class
, ACPI_BUS_CLASS
);
2079 case ACPI_BUS_TYPE_POWER
:
2080 acpi_add_id(pnp
, ACPI_POWER_HID
);
2082 case ACPI_BUS_TYPE_PROCESSOR
:
2083 acpi_add_id(pnp
, ACPI_PROCESSOR_OBJECT_HID
);
2085 case ACPI_BUS_TYPE_THERMAL
:
2086 acpi_add_id(pnp
, ACPI_THERMAL_HID
);
2088 case ACPI_BUS_TYPE_POWER_BUTTON
:
2089 acpi_add_id(pnp
, ACPI_BUTTON_HID_POWERF
);
2091 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
2092 acpi_add_id(pnp
, ACPI_BUTTON_HID_SLEEPF
);
2097 void acpi_free_pnp_ids(struct acpi_device_pnp
*pnp
)
2099 struct acpi_hardware_id
*id
, *tmp
;
2101 list_for_each_entry_safe(id
, tmp
, &pnp
->ids
, list
) {
2105 kfree(pnp
->unique_id
);
2108 void acpi_init_device_object(struct acpi_device
*device
, acpi_handle handle
,
2109 int type
, unsigned long long sta
)
2111 INIT_LIST_HEAD(&device
->pnp
.ids
);
2112 device
->device_type
= type
;
2113 device
->handle
= handle
;
2114 device
->parent
= acpi_bus_get_parent(handle
);
2115 device
->fwnode
.type
= FWNODE_ACPI
;
2116 acpi_set_device_status(device
, sta
);
2117 acpi_device_get_busid(device
);
2118 acpi_set_pnp_ids(handle
, &device
->pnp
, type
);
2119 acpi_init_properties(device
);
2120 acpi_bus_get_flags(device
);
2121 device
->flags
.match_driver
= false;
2122 device
->flags
.initialized
= true;
2123 device
->flags
.visited
= false;
2124 device_initialize(&device
->dev
);
2125 dev_set_uevent_suppress(&device
->dev
, true);
2128 void acpi_device_add_finalize(struct acpi_device
*device
)
2130 dev_set_uevent_suppress(&device
->dev
, false);
2131 kobject_uevent(&device
->dev
.kobj
, KOBJ_ADD
);
2134 static int acpi_add_single_object(struct acpi_device
**child
,
2135 acpi_handle handle
, int type
,
2136 unsigned long long sta
)
2139 struct acpi_device
*device
;
2140 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
2142 device
= kzalloc(sizeof(struct acpi_device
), GFP_KERNEL
);
2144 printk(KERN_ERR PREFIX
"Memory allocation error\n");
2148 acpi_init_device_object(device
, handle
, type
, sta
);
2149 acpi_bus_get_power_flags(device
);
2150 acpi_bus_get_wakeup_device_flags(device
);
2152 result
= acpi_device_add(device
, acpi_device_release
);
2154 acpi_device_release(&device
->dev
);
2158 acpi_power_add_remove_device(device
, true);
2159 acpi_device_add_finalize(device
);
2160 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
2161 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Added %s [%s] parent %s\n",
2162 dev_name(&device
->dev
), (char *) buffer
.pointer
,
2163 device
->parent
? dev_name(&device
->parent
->dev
) : "(null)"));
2164 kfree(buffer
.pointer
);
2169 static int acpi_bus_type_and_status(acpi_handle handle
, int *type
,
2170 unsigned long long *sta
)
2173 acpi_object_type acpi_type
;
2175 status
= acpi_get_type(handle
, &acpi_type
);
2176 if (ACPI_FAILURE(status
))
2179 switch (acpi_type
) {
2180 case ACPI_TYPE_ANY
: /* for ACPI_ROOT_OBJECT */
2181 case ACPI_TYPE_DEVICE
:
2182 *type
= ACPI_BUS_TYPE_DEVICE
;
2183 status
= acpi_bus_get_status_handle(handle
, sta
);
2184 if (ACPI_FAILURE(status
))
2187 case ACPI_TYPE_PROCESSOR
:
2188 *type
= ACPI_BUS_TYPE_PROCESSOR
;
2189 status
= acpi_bus_get_status_handle(handle
, sta
);
2190 if (ACPI_FAILURE(status
))
2193 case ACPI_TYPE_THERMAL
:
2194 *type
= ACPI_BUS_TYPE_THERMAL
;
2195 *sta
= ACPI_STA_DEFAULT
;
2197 case ACPI_TYPE_POWER
:
2198 *type
= ACPI_BUS_TYPE_POWER
;
2199 *sta
= ACPI_STA_DEFAULT
;
2208 bool acpi_device_is_present(struct acpi_device
*adev
)
2210 if (adev
->status
.present
|| adev
->status
.functional
)
2213 adev
->flags
.initialized
= false;
2217 static bool acpi_scan_handler_matching(struct acpi_scan_handler
*handler
,
2219 const struct acpi_device_id
**matchid
)
2221 const struct acpi_device_id
*devid
;
2224 return handler
->match(idstr
, matchid
);
2226 for (devid
= handler
->ids
; devid
->id
[0]; devid
++)
2227 if (!strcmp((char *)devid
->id
, idstr
)) {
2237 static struct acpi_scan_handler
*acpi_scan_match_handler(char *idstr
,
2238 const struct acpi_device_id
**matchid
)
2240 struct acpi_scan_handler
*handler
;
2242 list_for_each_entry(handler
, &acpi_scan_handlers_list
, list_node
)
2243 if (acpi_scan_handler_matching(handler
, idstr
, matchid
))
2249 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile
*hotplug
, bool val
)
2251 if (!!hotplug
->enabled
== !!val
)
2254 mutex_lock(&acpi_scan_lock
);
2256 hotplug
->enabled
= val
;
2258 mutex_unlock(&acpi_scan_lock
);
2261 static void acpi_scan_init_hotplug(struct acpi_device
*adev
)
2263 struct acpi_hardware_id
*hwid
;
2265 if (acpi_dock_match(adev
->handle
) || is_ejectable_bay(adev
)) {
2266 acpi_dock_add(adev
);
2269 list_for_each_entry(hwid
, &adev
->pnp
.ids
, list
) {
2270 struct acpi_scan_handler
*handler
;
2272 handler
= acpi_scan_match_handler(hwid
->id
, NULL
);
2274 adev
->flags
.hotplug_notify
= true;
2280 static void acpi_device_dep_initialize(struct acpi_device
*adev
)
2282 struct acpi_dep_data
*dep
;
2283 struct acpi_handle_list dep_devices
;
2287 if (!acpi_has_method(adev
->handle
, "_DEP"))
2290 status
= acpi_evaluate_reference(adev
->handle
, "_DEP", NULL
,
2292 if (ACPI_FAILURE(status
)) {
2293 dev_dbg(&adev
->dev
, "Failed to evaluate _DEP.\n");
2297 for (i
= 0; i
< dep_devices
.count
; i
++) {
2298 struct acpi_device_info
*info
;
2301 status
= acpi_get_object_info(dep_devices
.handles
[i
], &info
);
2302 if (ACPI_FAILURE(status
)) {
2303 dev_dbg(&adev
->dev
, "Error reading _DEP device info\n");
2308 * Skip the dependency of Windows System Power
2309 * Management Controller
2311 skip
= info
->valid
& ACPI_VALID_HID
&&
2312 !strcmp(info
->hardware_id
.string
, "INT3396");
2319 dep
= kzalloc(sizeof(struct acpi_dep_data
), GFP_KERNEL
);
2323 dep
->master
= dep_devices
.handles
[i
];
2324 dep
->slave
= adev
->handle
;
2327 mutex_lock(&acpi_dep_list_lock
);
2328 list_add_tail(&dep
->node
, &acpi_dep_list
);
2329 mutex_unlock(&acpi_dep_list_lock
);
2333 static acpi_status
acpi_bus_check_add(acpi_handle handle
, u32 lvl_not_used
,
2334 void *not_used
, void **return_value
)
2336 struct acpi_device
*device
= NULL
;
2338 unsigned long long sta
;
2341 acpi_bus_get_device(handle
, &device
);
2345 result
= acpi_bus_type_and_status(handle
, &type
, &sta
);
2349 if (type
== ACPI_BUS_TYPE_POWER
) {
2350 acpi_add_power_resource(handle
);
2354 acpi_add_single_object(&device
, handle
, type
, sta
);
2356 return AE_CTRL_DEPTH
;
2358 acpi_scan_init_hotplug(device
);
2359 acpi_device_dep_initialize(device
);
2363 *return_value
= device
;
2368 static int acpi_check_spi_i2c_slave(struct acpi_resource
*ares
, void *data
)
2370 bool *is_spi_i2c_slave_p
= data
;
2372 if (ares
->type
!= ACPI_RESOURCE_TYPE_SERIAL_BUS
)
2376 * devices that are connected to UART still need to be enumerated to
2379 if (ares
->data
.common_serial_bus
.type
!= ACPI_RESOURCE_SERIAL_TYPE_UART
)
2380 *is_spi_i2c_slave_p
= true;
2382 /* no need to do more checking */
2386 static void acpi_default_enumeration(struct acpi_device
*device
)
2388 struct list_head resource_list
;
2389 bool is_spi_i2c_slave
= false;
2391 if (!device
->pnp
.type
.platform_id
|| device
->handler
)
2395 * Do not enemerate SPI/I2C slaves as they will be enuerated by their
2396 * respective parents.
2398 INIT_LIST_HEAD(&resource_list
);
2399 acpi_dev_get_resources(device
, &resource_list
, acpi_check_spi_i2c_slave
,
2401 acpi_dev_free_resource_list(&resource_list
);
2402 if (!is_spi_i2c_slave
)
2403 acpi_create_platform_device(device
);
2406 static int acpi_scan_attach_handler(struct acpi_device
*device
)
2408 struct acpi_hardware_id
*hwid
;
2411 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
) {
2412 const struct acpi_device_id
*devid
;
2413 struct acpi_scan_handler
*handler
;
2415 handler
= acpi_scan_match_handler(hwid
->id
, &devid
);
2417 if (!handler
->attach
) {
2418 device
->pnp
.type
.platform_id
= 0;
2421 device
->handler
= handler
;
2422 ret
= handler
->attach(device
, devid
);
2426 device
->handler
= NULL
;
2432 acpi_default_enumeration(device
);
2437 static void acpi_bus_attach(struct acpi_device
*device
)
2439 struct acpi_device
*child
;
2443 if (ACPI_SUCCESS(acpi_bus_get_ejd(device
->handle
, &ejd
)))
2444 register_dock_dependent_device(device
, ejd
);
2446 acpi_bus_get_status(device
);
2447 /* Skip devices that are not present. */
2448 if (!acpi_device_is_present(device
)) {
2449 device
->flags
.visited
= false;
2450 device
->flags
.power_manageable
= 0;
2453 if (device
->handler
)
2456 if (!device
->flags
.initialized
) {
2457 device
->flags
.power_manageable
=
2458 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
;
2459 if (acpi_bus_init_power(device
))
2460 device
->flags
.power_manageable
= 0;
2462 device
->flags
.initialized
= true;
2464 device
->flags
.visited
= false;
2465 ret
= acpi_scan_attach_handler(device
);
2469 device
->flags
.match_driver
= true;
2471 ret
= device_attach(&device
->dev
);
2475 device
->flags
.visited
= true;
2478 list_for_each_entry(child
, &device
->children
, node
)
2479 acpi_bus_attach(child
);
2481 if (device
->handler
&& device
->handler
->hotplug
.notify_online
)
2482 device
->handler
->hotplug
.notify_online(device
);
2485 void acpi_walk_dep_device_list(acpi_handle handle
)
2487 struct acpi_dep_data
*dep
, *tmp
;
2488 struct acpi_device
*adev
;
2490 mutex_lock(&acpi_dep_list_lock
);
2491 list_for_each_entry_safe(dep
, tmp
, &acpi_dep_list
, node
) {
2492 if (dep
->master
== handle
) {
2493 acpi_bus_get_device(dep
->slave
, &adev
);
2498 if (!adev
->dep_unmet
)
2499 acpi_bus_attach(adev
);
2500 list_del(&dep
->node
);
2504 mutex_unlock(&acpi_dep_list_lock
);
2506 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list
);
2509 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2510 * @handle: Root of the namespace scope to scan.
2512 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2515 * If no devices were found, -ENODEV is returned, but it does not mean that
2516 * there has been a real error. There just have been no suitable ACPI objects
2517 * in the table trunk from which the kernel could create a device and add an
2518 * appropriate driver.
2520 * Must be called under acpi_scan_lock.
2522 int acpi_bus_scan(acpi_handle handle
)
2524 void *device
= NULL
;
2526 if (ACPI_SUCCESS(acpi_bus_check_add(handle
, 0, NULL
, &device
)))
2527 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
2528 acpi_bus_check_add
, NULL
, NULL
, &device
);
2531 acpi_bus_attach(device
);
2536 EXPORT_SYMBOL(acpi_bus_scan
);
2539 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2540 * @adev: Root of the ACPI namespace scope to walk.
2542 * Must be called under acpi_scan_lock.
2544 void acpi_bus_trim(struct acpi_device
*adev
)
2546 struct acpi_scan_handler
*handler
= adev
->handler
;
2547 struct acpi_device
*child
;
2549 list_for_each_entry_reverse(child
, &adev
->children
, node
)
2550 acpi_bus_trim(child
);
2552 adev
->flags
.match_driver
= false;
2554 if (handler
->detach
)
2555 handler
->detach(adev
);
2557 adev
->handler
= NULL
;
2559 device_release_driver(&adev
->dev
);
2562 * Most likely, the device is going away, so put it into D3cold before
2565 acpi_device_set_power(adev
, ACPI_STATE_D3_COLD
);
2566 adev
->flags
.initialized
= false;
2567 adev
->flags
.visited
= false;
2569 EXPORT_SYMBOL_GPL(acpi_bus_trim
);
2571 static int acpi_bus_scan_fixed(void)
2576 * Enumerate all fixed-feature devices.
2578 if (!(acpi_gbl_FADT
.flags
& ACPI_FADT_POWER_BUTTON
)) {
2579 struct acpi_device
*device
= NULL
;
2581 result
= acpi_add_single_object(&device
, NULL
,
2582 ACPI_BUS_TYPE_POWER_BUTTON
,
2587 device
->flags
.match_driver
= true;
2588 result
= device_attach(&device
->dev
);
2592 device_init_wakeup(&device
->dev
, true);
2595 if (!(acpi_gbl_FADT
.flags
& ACPI_FADT_SLEEP_BUTTON
)) {
2596 struct acpi_device
*device
= NULL
;
2598 result
= acpi_add_single_object(&device
, NULL
,
2599 ACPI_BUS_TYPE_SLEEP_BUTTON
,
2604 device
->flags
.match_driver
= true;
2605 result
= device_attach(&device
->dev
);
2608 return result
< 0 ? result
: 0;
2611 int __init
acpi_scan_init(void)
2615 result
= bus_register(&acpi_bus_type
);
2617 /* We don't want to quit even if we failed to add suspend/resume */
2618 printk(KERN_ERR PREFIX
"Could not register bus type\n");
2621 acpi_pci_root_init();
2622 acpi_pci_link_init();
2623 acpi_processor_init();
2626 acpi_cmos_rtc_init();
2627 acpi_container_init();
2628 acpi_memory_hotplug_init();
2630 acpi_int340x_thermal_init();
2632 mutex_lock(&acpi_scan_lock
);
2634 * Enumerate devices in the ACPI namespace.
2636 result
= acpi_bus_scan(ACPI_ROOT_OBJECT
);
2640 result
= acpi_bus_get_device(ACPI_ROOT_OBJECT
, &acpi_root
);
2644 /* Fixed feature devices do not exist on HW-reduced platform */
2645 if (!acpi_gbl_reduced_hardware
) {
2646 result
= acpi_bus_scan_fixed();
2648 acpi_detach_data(acpi_root
->handle
,
2649 acpi_scan_drop_device
);
2650 acpi_device_del(acpi_root
);
2651 put_device(&acpi_root
->dev
);
2656 acpi_update_all_gpes();
2659 mutex_unlock(&acpi_scan_lock
);