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
;
379 * acpi_container_offline() calls this for all of the container's
380 * children under the container's physical_node_lock lock.
382 mutex_lock_nested(&adev
->physical_node_lock
, SINGLE_DEPTH_NESTING
);
384 list_for_each_entry(pn
, &adev
->physical_node_list
, node
)
385 if (device_supports_offline(pn
->dev
) && !pn
->dev
->offline
) {
387 kobject_uevent(&pn
->dev
->kobj
, KOBJ_CHANGE
);
393 mutex_unlock(&adev
->physical_node_lock
);
397 static acpi_status
acpi_bus_offline(acpi_handle handle
, u32 lvl
, void *data
,
400 struct acpi_device
*device
= NULL
;
401 struct acpi_device_physical_node
*pn
;
402 bool second_pass
= (bool)data
;
403 acpi_status status
= AE_OK
;
405 if (acpi_bus_get_device(handle
, &device
))
408 if (device
->handler
&& !device
->handler
->hotplug
.enabled
) {
409 *ret_p
= &device
->dev
;
413 mutex_lock(&device
->physical_node_lock
);
415 list_for_each_entry(pn
, &device
->physical_node_list
, node
) {
419 /* Skip devices offlined by the first pass. */
423 pn
->put_online
= false;
425 ret
= device_offline(pn
->dev
);
426 if (acpi_force_hot_remove
)
430 pn
->put_online
= !ret
;
440 mutex_unlock(&device
->physical_node_lock
);
445 static acpi_status
acpi_bus_online(acpi_handle handle
, u32 lvl
, void *data
,
448 struct acpi_device
*device
= NULL
;
449 struct acpi_device_physical_node
*pn
;
451 if (acpi_bus_get_device(handle
, &device
))
454 mutex_lock(&device
->physical_node_lock
);
456 list_for_each_entry(pn
, &device
->physical_node_list
, node
)
457 if (pn
->put_online
) {
458 device_online(pn
->dev
);
459 pn
->put_online
= false;
462 mutex_unlock(&device
->physical_node_lock
);
467 static int acpi_scan_try_to_offline(struct acpi_device
*device
)
469 acpi_handle handle
= device
->handle
;
470 struct device
*errdev
= NULL
;
474 * Carry out two passes here and ignore errors in the first pass,
475 * because if the devices in question are memory blocks and
476 * CONFIG_MEMCG is set, one of the blocks may hold data structures
477 * that the other blocks depend on, but it is not known in advance which
480 * If the first pass is successful, the second one isn't needed, though.
482 status
= acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
483 NULL
, acpi_bus_offline
, (void *)false,
485 if (status
== AE_SUPPORT
) {
486 dev_warn(errdev
, "Offline disabled.\n");
487 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
488 acpi_bus_online
, NULL
, NULL
, NULL
);
491 acpi_bus_offline(handle
, 0, (void *)false, (void **)&errdev
);
494 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
495 NULL
, acpi_bus_offline
, (void *)true,
497 if (!errdev
|| acpi_force_hot_remove
)
498 acpi_bus_offline(handle
, 0, (void *)true,
501 if (errdev
&& !acpi_force_hot_remove
) {
502 dev_warn(errdev
, "Offline failed.\n");
503 acpi_bus_online(handle
, 0, NULL
, NULL
);
504 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
,
505 ACPI_UINT32_MAX
, acpi_bus_online
,
513 static int acpi_scan_hot_remove(struct acpi_device
*device
)
515 acpi_handle handle
= device
->handle
;
516 unsigned long long sta
;
519 if (device
->handler
&& device
->handler
->hotplug
.demand_offline
520 && !acpi_force_hot_remove
) {
521 if (!acpi_scan_is_offline(device
, true))
524 int error
= acpi_scan_try_to_offline(device
);
529 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
530 "Hot-removing device %s...\n", dev_name(&device
->dev
)));
532 acpi_bus_trim(device
);
534 acpi_evaluate_lck(handle
, 0);
538 status
= acpi_evaluate_ej0(handle
);
539 if (status
== AE_NOT_FOUND
)
541 else if (ACPI_FAILURE(status
))
545 * Verify if eject was indeed successful. If not, log an error
546 * message. No need to call _OST since _EJ0 call was made OK.
548 status
= acpi_evaluate_integer(handle
, "_STA", NULL
, &sta
);
549 if (ACPI_FAILURE(status
)) {
550 acpi_handle_warn(handle
,
551 "Status check after eject failed (0x%x)\n", status
);
552 } else if (sta
& ACPI_STA_DEVICE_ENABLED
) {
553 acpi_handle_warn(handle
,
554 "Eject incomplete - status 0x%llx\n", sta
);
560 static int acpi_scan_device_not_present(struct acpi_device
*adev
)
562 if (!acpi_device_enumerated(adev
)) {
563 dev_warn(&adev
->dev
, "Still not present\n");
570 static int acpi_scan_device_check(struct acpi_device
*adev
)
574 acpi_bus_get_status(adev
);
575 if (adev
->status
.present
|| adev
->status
.functional
) {
577 * This function is only called for device objects for which
578 * matching scan handlers exist. The only situation in which
579 * the scan handler is not attached to this device object yet
580 * is when the device has just appeared (either it wasn't
581 * present at all before or it was removed and then added
585 dev_warn(&adev
->dev
, "Already enumerated\n");
588 error
= acpi_bus_scan(adev
->handle
);
590 dev_warn(&adev
->dev
, "Namespace scan failure\n");
593 if (!adev
->handler
) {
594 dev_warn(&adev
->dev
, "Enumeration failure\n");
598 error
= acpi_scan_device_not_present(adev
);
603 static int acpi_scan_bus_check(struct acpi_device
*adev
)
605 struct acpi_scan_handler
*handler
= adev
->handler
;
606 struct acpi_device
*child
;
609 acpi_bus_get_status(adev
);
610 if (!(adev
->status
.present
|| adev
->status
.functional
)) {
611 acpi_scan_device_not_present(adev
);
614 if (handler
&& handler
->hotplug
.scan_dependent
)
615 return handler
->hotplug
.scan_dependent(adev
);
617 error
= acpi_bus_scan(adev
->handle
);
619 dev_warn(&adev
->dev
, "Namespace scan failure\n");
622 list_for_each_entry(child
, &adev
->children
, node
) {
623 error
= acpi_scan_bus_check(child
);
630 static int acpi_generic_hotplug_event(struct acpi_device
*adev
, u32 type
)
633 case ACPI_NOTIFY_BUS_CHECK
:
634 return acpi_scan_bus_check(adev
);
635 case ACPI_NOTIFY_DEVICE_CHECK
:
636 return acpi_scan_device_check(adev
);
637 case ACPI_NOTIFY_EJECT_REQUEST
:
638 case ACPI_OST_EC_OSPM_EJECT
:
639 if (adev
->handler
&& !adev
->handler
->hotplug
.enabled
) {
640 dev_info(&adev
->dev
, "Eject disabled\n");
643 acpi_evaluate_ost(adev
->handle
, ACPI_NOTIFY_EJECT_REQUEST
,
644 ACPI_OST_SC_EJECT_IN_PROGRESS
, NULL
);
645 return acpi_scan_hot_remove(adev
);
650 void acpi_device_hotplug(struct acpi_device
*adev
, u32 src
)
652 u32 ost_code
= ACPI_OST_SC_NON_SPECIFIC_FAILURE
;
655 lock_device_hotplug();
656 mutex_lock(&acpi_scan_lock
);
659 * The device object's ACPI handle cannot become invalid as long as we
660 * are holding acpi_scan_lock, but it might have become invalid before
661 * that lock was acquired.
663 if (adev
->handle
== INVALID_ACPI_HANDLE
)
666 if (adev
->flags
.is_dock_station
) {
667 error
= dock_notify(adev
, src
);
668 } else if (adev
->flags
.hotplug_notify
) {
669 error
= acpi_generic_hotplug_event(adev
, src
);
670 if (error
== -EPERM
) {
671 ost_code
= ACPI_OST_SC_EJECT_NOT_SUPPORTED
;
675 int (*notify
)(struct acpi_device
*, u32
);
677 acpi_lock_hp_context();
678 notify
= adev
->hp
? adev
->hp
->notify
: NULL
;
679 acpi_unlock_hp_context();
681 * There may be additional notify handlers for device objects
682 * without the .event() callback, so ignore them here.
685 error
= notify(adev
, src
);
690 ost_code
= ACPI_OST_SC_SUCCESS
;
693 acpi_evaluate_ost(adev
->handle
, src
, ost_code
, NULL
);
696 acpi_bus_put_acpi_device(adev
);
697 mutex_unlock(&acpi_scan_lock
);
698 unlock_device_hotplug();
701 static ssize_t
real_power_state_show(struct device
*dev
,
702 struct device_attribute
*attr
, char *buf
)
704 struct acpi_device
*adev
= to_acpi_device(dev
);
708 ret
= acpi_device_get_power(adev
, &state
);
712 return sprintf(buf
, "%s\n", acpi_power_state_string(state
));
715 static DEVICE_ATTR(real_power_state
, 0444, real_power_state_show
, NULL
);
717 static ssize_t
power_state_show(struct device
*dev
,
718 struct device_attribute
*attr
, char *buf
)
720 struct acpi_device
*adev
= to_acpi_device(dev
);
722 return sprintf(buf
, "%s\n", acpi_power_state_string(adev
->power
.state
));
725 static DEVICE_ATTR(power_state
, 0444, power_state_show
, NULL
);
728 acpi_eject_store(struct device
*d
, struct device_attribute
*attr
,
729 const char *buf
, size_t count
)
731 struct acpi_device
*acpi_device
= to_acpi_device(d
);
732 acpi_object_type not_used
;
735 if (!count
|| buf
[0] != '1')
738 if ((!acpi_device
->handler
|| !acpi_device
->handler
->hotplug
.enabled
)
739 && !acpi_device
->driver
)
742 status
= acpi_get_type(acpi_device
->handle
, ¬_used
);
743 if (ACPI_FAILURE(status
) || !acpi_device
->flags
.ejectable
)
746 get_device(&acpi_device
->dev
);
747 status
= acpi_hotplug_schedule(acpi_device
, ACPI_OST_EC_OSPM_EJECT
);
748 if (ACPI_SUCCESS(status
))
751 put_device(&acpi_device
->dev
);
752 acpi_evaluate_ost(acpi_device
->handle
, ACPI_OST_EC_OSPM_EJECT
,
753 ACPI_OST_SC_NON_SPECIFIC_FAILURE
, NULL
);
754 return status
== AE_NO_MEMORY
? -ENOMEM
: -EAGAIN
;
757 static DEVICE_ATTR(eject
, 0200, NULL
, acpi_eject_store
);
760 acpi_device_hid_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
761 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
763 return sprintf(buf
, "%s\n", acpi_device_hid(acpi_dev
));
765 static DEVICE_ATTR(hid
, 0444, acpi_device_hid_show
, NULL
);
767 static ssize_t
acpi_device_uid_show(struct device
*dev
,
768 struct device_attribute
*attr
, char *buf
)
770 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
772 return sprintf(buf
, "%s\n", acpi_dev
->pnp
.unique_id
);
774 static DEVICE_ATTR(uid
, 0444, acpi_device_uid_show
, NULL
);
776 static ssize_t
acpi_device_adr_show(struct device
*dev
,
777 struct device_attribute
*attr
, char *buf
)
779 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
781 return sprintf(buf
, "0x%08x\n",
782 (unsigned int)(acpi_dev
->pnp
.bus_address
));
784 static DEVICE_ATTR(adr
, 0444, acpi_device_adr_show
, NULL
);
787 acpi_device_path_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
788 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
789 struct acpi_buffer path
= {ACPI_ALLOCATE_BUFFER
, NULL
};
792 result
= acpi_get_name(acpi_dev
->handle
, ACPI_FULL_PATHNAME
, &path
);
796 result
= sprintf(buf
, "%s\n", (char*)path
.pointer
);
801 static DEVICE_ATTR(path
, 0444, acpi_device_path_show
, NULL
);
803 /* sysfs file that shows description text from the ACPI _STR method */
804 static ssize_t
description_show(struct device
*dev
,
805 struct device_attribute
*attr
,
807 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
810 if (acpi_dev
->pnp
.str_obj
== NULL
)
814 * The _STR object contains a Unicode identifier for a device.
815 * We need to convert to utf-8 so it can be displayed.
817 result
= utf16s_to_utf8s(
818 (wchar_t *)acpi_dev
->pnp
.str_obj
->buffer
.pointer
,
819 acpi_dev
->pnp
.str_obj
->buffer
.length
,
820 UTF16_LITTLE_ENDIAN
, buf
,
823 buf
[result
++] = '\n';
827 static DEVICE_ATTR(description
, 0444, description_show
, NULL
);
830 acpi_device_sun_show(struct device
*dev
, struct device_attribute
*attr
,
832 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
834 unsigned long long sun
;
836 status
= acpi_evaluate_integer(acpi_dev
->handle
, "_SUN", NULL
, &sun
);
837 if (ACPI_FAILURE(status
))
840 return sprintf(buf
, "%llu\n", sun
);
842 static DEVICE_ATTR(sun
, 0444, acpi_device_sun_show
, NULL
);
844 static ssize_t
status_show(struct device
*dev
, struct device_attribute
*attr
,
846 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
848 unsigned long long sta
;
850 status
= acpi_evaluate_integer(acpi_dev
->handle
, "_STA", NULL
, &sta
);
851 if (ACPI_FAILURE(status
))
854 return sprintf(buf
, "%llu\n", sta
);
856 static DEVICE_ATTR_RO(status
);
858 static int acpi_device_setup_files(struct acpi_device
*dev
)
860 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
865 * Devices gotten from FADT don't have a "path" attribute
868 result
= device_create_file(&dev
->dev
, &dev_attr_path
);
873 if (!list_empty(&dev
->pnp
.ids
)) {
874 result
= device_create_file(&dev
->dev
, &dev_attr_hid
);
878 result
= device_create_file(&dev
->dev
, &dev_attr_modalias
);
884 * If device has _STR, 'description' file is created
886 if (acpi_has_method(dev
->handle
, "_STR")) {
887 status
= acpi_evaluate_object(dev
->handle
, "_STR",
889 if (ACPI_FAILURE(status
))
890 buffer
.pointer
= NULL
;
891 dev
->pnp
.str_obj
= buffer
.pointer
;
892 result
= device_create_file(&dev
->dev
, &dev_attr_description
);
897 if (dev
->pnp
.type
.bus_address
)
898 result
= device_create_file(&dev
->dev
, &dev_attr_adr
);
899 if (dev
->pnp
.unique_id
)
900 result
= device_create_file(&dev
->dev
, &dev_attr_uid
);
902 if (acpi_has_method(dev
->handle
, "_SUN")) {
903 result
= device_create_file(&dev
->dev
, &dev_attr_sun
);
908 if (acpi_has_method(dev
->handle
, "_STA")) {
909 result
= device_create_file(&dev
->dev
, &dev_attr_status
);
915 * If device has _EJ0, 'eject' file is created that is used to trigger
916 * hot-removal function from userland.
918 if (acpi_has_method(dev
->handle
, "_EJ0")) {
919 result
= device_create_file(&dev
->dev
, &dev_attr_eject
);
924 if (dev
->flags
.power_manageable
) {
925 result
= device_create_file(&dev
->dev
, &dev_attr_power_state
);
929 if (dev
->power
.flags
.power_resources
)
930 result
= device_create_file(&dev
->dev
,
931 &dev_attr_real_power_state
);
938 static void acpi_device_remove_files(struct acpi_device
*dev
)
940 if (dev
->flags
.power_manageable
) {
941 device_remove_file(&dev
->dev
, &dev_attr_power_state
);
942 if (dev
->power
.flags
.power_resources
)
943 device_remove_file(&dev
->dev
,
944 &dev_attr_real_power_state
);
948 * If device has _STR, remove 'description' file
950 if (acpi_has_method(dev
->handle
, "_STR")) {
951 kfree(dev
->pnp
.str_obj
);
952 device_remove_file(&dev
->dev
, &dev_attr_description
);
955 * If device has _EJ0, remove 'eject' file.
957 if (acpi_has_method(dev
->handle
, "_EJ0"))
958 device_remove_file(&dev
->dev
, &dev_attr_eject
);
960 if (acpi_has_method(dev
->handle
, "_SUN"))
961 device_remove_file(&dev
->dev
, &dev_attr_sun
);
963 if (dev
->pnp
.unique_id
)
964 device_remove_file(&dev
->dev
, &dev_attr_uid
);
965 if (dev
->pnp
.type
.bus_address
)
966 device_remove_file(&dev
->dev
, &dev_attr_adr
);
967 device_remove_file(&dev
->dev
, &dev_attr_modalias
);
968 device_remove_file(&dev
->dev
, &dev_attr_hid
);
969 if (acpi_has_method(dev
->handle
, "_STA"))
970 device_remove_file(&dev
->dev
, &dev_attr_status
);
972 device_remove_file(&dev
->dev
, &dev_attr_path
);
974 /* --------------------------------------------------------------------------
976 -------------------------------------------------------------------------- */
979 * acpi_of_match_device - Match device object using the "compatible" property.
980 * @adev: ACPI device object to match.
981 * @of_match_table: List of device IDs to match against.
983 * If @dev has an ACPI companion which has the special PRP0001 device ID in its
984 * list of identifiers and a _DSD object with the "compatible" property, use
985 * that property to match against the given list of identifiers.
987 static bool acpi_of_match_device(struct acpi_device
*adev
,
988 const struct of_device_id
*of_match_table
)
990 const union acpi_object
*of_compatible
, *obj
;
996 of_compatible
= adev
->data
.of_compatible
;
997 if (!of_match_table
|| !of_compatible
)
1000 if (of_compatible
->type
== ACPI_TYPE_PACKAGE
) {
1001 nval
= of_compatible
->package
.count
;
1002 obj
= of_compatible
->package
.elements
;
1003 } else { /* Must be ACPI_TYPE_STRING. */
1005 obj
= of_compatible
;
1007 /* Now we can look for the driver DT compatible strings */
1008 for (i
= 0; i
< nval
; i
++, obj
++) {
1009 const struct of_device_id
*id
;
1011 for (id
= of_match_table
; id
->compatible
[0]; id
++)
1012 if (!strcasecmp(obj
->string
.pointer
, id
->compatible
))
1019 static const struct acpi_device_id
*__acpi_match_device(
1020 struct acpi_device
*device
,
1021 const struct acpi_device_id
*ids
,
1022 const struct of_device_id
*of_ids
)
1024 const struct acpi_device_id
*id
;
1025 struct acpi_hardware_id
*hwid
;
1028 * If the device is not present, it is unnecessary to load device
1031 if (!device
|| !device
->status
.present
)
1034 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
) {
1035 /* First, check the ACPI/PNP IDs provided by the caller. */
1036 for (id
= ids
; id
->id
[0]; id
++)
1037 if (!strcmp((char *) id
->id
, hwid
->id
))
1041 * Next, check the special "PRP0001" ID and try to match the
1042 * "compatible" property if found.
1044 * The id returned by the below is not valid, but the only
1045 * caller passing non-NULL of_ids here is only interested in
1046 * whether or not the return value is NULL.
1048 if (!strcmp("PRP0001", hwid
->id
)
1049 && acpi_of_match_device(device
, of_ids
))
1056 * acpi_match_device - Match a struct device against a given list of ACPI IDs
1057 * @ids: Array of struct acpi_device_id object to match against.
1058 * @dev: The device structure to match.
1060 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
1061 * object for that handle and use that object to match against a given list of
1064 * Return a pointer to the first matching ID on success or %NULL on failure.
1066 const struct acpi_device_id
*acpi_match_device(const struct acpi_device_id
*ids
,
1067 const struct device
*dev
)
1069 return __acpi_match_device(acpi_companion_match(dev
), ids
, NULL
);
1071 EXPORT_SYMBOL_GPL(acpi_match_device
);
1073 int acpi_match_device_ids(struct acpi_device
*device
,
1074 const struct acpi_device_id
*ids
)
1076 return __acpi_match_device(device
, ids
, NULL
) ? 0 : -ENOENT
;
1078 EXPORT_SYMBOL(acpi_match_device_ids
);
1080 bool acpi_driver_match_device(struct device
*dev
,
1081 const struct device_driver
*drv
)
1083 if (!drv
->acpi_match_table
)
1084 return acpi_of_match_device(ACPI_COMPANION(dev
),
1085 drv
->of_match_table
);
1087 return !!__acpi_match_device(acpi_companion_match(dev
),
1088 drv
->acpi_match_table
, drv
->of_match_table
);
1090 EXPORT_SYMBOL_GPL(acpi_driver_match_device
);
1092 static void acpi_free_power_resources_lists(struct acpi_device
*device
)
1096 if (device
->wakeup
.flags
.valid
)
1097 acpi_power_resources_list_free(&device
->wakeup
.resources
);
1099 if (!device
->power
.flags
.power_resources
)
1102 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3_HOT
; i
++) {
1103 struct acpi_device_power_state
*ps
= &device
->power
.states
[i
];
1104 acpi_power_resources_list_free(&ps
->resources
);
1108 static void acpi_device_release(struct device
*dev
)
1110 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
1112 acpi_free_properties(acpi_dev
);
1113 acpi_free_pnp_ids(&acpi_dev
->pnp
);
1114 acpi_free_power_resources_lists(acpi_dev
);
1118 static int acpi_bus_match(struct device
*dev
, struct device_driver
*drv
)
1120 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
1121 struct acpi_driver
*acpi_drv
= to_acpi_driver(drv
);
1123 return acpi_dev
->flags
.match_driver
1124 && !acpi_match_device_ids(acpi_dev
, acpi_drv
->ids
);
1127 static int acpi_device_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
1129 return __acpi_device_uevent_modalias(to_acpi_device(dev
), env
);
1132 static void acpi_device_notify(acpi_handle handle
, u32 event
, void *data
)
1134 struct acpi_device
*device
= data
;
1136 device
->driver
->ops
.notify(device
, event
);
1139 static void acpi_device_notify_fixed(void *data
)
1141 struct acpi_device
*device
= data
;
1143 /* Fixed hardware devices have no handles */
1144 acpi_device_notify(NULL
, ACPI_FIXED_HARDWARE_EVENT
, device
);
1147 static u32
acpi_device_fixed_event(void *data
)
1149 acpi_os_execute(OSL_NOTIFY_HANDLER
, acpi_device_notify_fixed
, data
);
1150 return ACPI_INTERRUPT_HANDLED
;
1153 static int acpi_device_install_notify_handler(struct acpi_device
*device
)
1157 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
1159 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
1160 acpi_device_fixed_event
,
1162 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
1164 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
1165 acpi_device_fixed_event
,
1168 status
= acpi_install_notify_handler(device
->handle
,
1173 if (ACPI_FAILURE(status
))
1178 static void acpi_device_remove_notify_handler(struct acpi_device
*device
)
1180 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
1181 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
1182 acpi_device_fixed_event
);
1183 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
1184 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
1185 acpi_device_fixed_event
);
1187 acpi_remove_notify_handler(device
->handle
, ACPI_DEVICE_NOTIFY
,
1188 acpi_device_notify
);
1191 static int acpi_device_probe(struct device
*dev
)
1193 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
1194 struct acpi_driver
*acpi_drv
= to_acpi_driver(dev
->driver
);
1197 if (acpi_dev
->handler
&& !acpi_is_pnp_device(acpi_dev
))
1200 if (!acpi_drv
->ops
.add
)
1203 ret
= acpi_drv
->ops
.add(acpi_dev
);
1207 acpi_dev
->driver
= acpi_drv
;
1208 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1209 "Driver [%s] successfully bound to device [%s]\n",
1210 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
1212 if (acpi_drv
->ops
.notify
) {
1213 ret
= acpi_device_install_notify_handler(acpi_dev
);
1215 if (acpi_drv
->ops
.remove
)
1216 acpi_drv
->ops
.remove(acpi_dev
);
1218 acpi_dev
->driver
= NULL
;
1219 acpi_dev
->driver_data
= NULL
;
1224 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found driver [%s] for device [%s]\n",
1225 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
1230 static int acpi_device_remove(struct device
* dev
)
1232 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
1233 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
1236 if (acpi_drv
->ops
.notify
)
1237 acpi_device_remove_notify_handler(acpi_dev
);
1238 if (acpi_drv
->ops
.remove
)
1239 acpi_drv
->ops
.remove(acpi_dev
);
1241 acpi_dev
->driver
= NULL
;
1242 acpi_dev
->driver_data
= NULL
;
1248 struct bus_type acpi_bus_type
= {
1250 .match
= acpi_bus_match
,
1251 .probe
= acpi_device_probe
,
1252 .remove
= acpi_device_remove
,
1253 .uevent
= acpi_device_uevent
,
1256 static void acpi_device_del(struct acpi_device
*device
)
1258 mutex_lock(&acpi_device_lock
);
1260 list_del(&device
->node
);
1262 list_del(&device
->wakeup_list
);
1263 mutex_unlock(&acpi_device_lock
);
1265 acpi_power_add_remove_device(device
, false);
1266 acpi_device_remove_files(device
);
1268 device
->remove(device
);
1270 device_del(&device
->dev
);
1273 static LIST_HEAD(acpi_device_del_list
);
1274 static DEFINE_MUTEX(acpi_device_del_lock
);
1276 static void acpi_device_del_work_fn(struct work_struct
*work_not_used
)
1279 struct acpi_device
*adev
;
1281 mutex_lock(&acpi_device_del_lock
);
1283 if (list_empty(&acpi_device_del_list
)) {
1284 mutex_unlock(&acpi_device_del_lock
);
1287 adev
= list_first_entry(&acpi_device_del_list
,
1288 struct acpi_device
, del_list
);
1289 list_del(&adev
->del_list
);
1291 mutex_unlock(&acpi_device_del_lock
);
1293 acpi_device_del(adev
);
1295 * Drop references to all power resources that might have been
1296 * used by the device.
1298 acpi_power_transition(adev
, ACPI_STATE_D3_COLD
);
1299 put_device(&adev
->dev
);
1304 * acpi_scan_drop_device - Drop an ACPI device object.
1305 * @handle: Handle of an ACPI namespace node, not used.
1306 * @context: Address of the ACPI device object to drop.
1308 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
1309 * namespace node the device object pointed to by @context is attached to.
1311 * The unregistration is carried out asynchronously to avoid running
1312 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
1313 * ensure the correct ordering (the device objects must be unregistered in the
1314 * same order in which the corresponding namespace nodes are deleted).
1316 static void acpi_scan_drop_device(acpi_handle handle
, void *context
)
1318 static DECLARE_WORK(work
, acpi_device_del_work_fn
);
1319 struct acpi_device
*adev
= context
;
1321 mutex_lock(&acpi_device_del_lock
);
1324 * Use the ACPI hotplug workqueue which is ordered, so this work item
1325 * won't run after any hotplug work items submitted subsequently. That
1326 * prevents attempts to register device objects identical to those being
1327 * deleted from happening concurrently (such attempts result from
1328 * hotplug events handled via the ACPI hotplug workqueue). It also will
1329 * run after all of the work items submitted previosuly, which helps
1330 * those work items to ensure that they are not accessing stale device
1333 if (list_empty(&acpi_device_del_list
))
1334 acpi_queue_hotplug_work(&work
);
1336 list_add_tail(&adev
->del_list
, &acpi_device_del_list
);
1337 /* Make acpi_ns_validate_handle() return NULL for this handle. */
1338 adev
->handle
= INVALID_ACPI_HANDLE
;
1340 mutex_unlock(&acpi_device_del_lock
);
1343 static int acpi_get_device_data(acpi_handle handle
, struct acpi_device
**device
,
1344 void (*callback
)(void *))
1351 status
= acpi_get_data_full(handle
, acpi_scan_drop_device
,
1352 (void **)device
, callback
);
1353 if (ACPI_FAILURE(status
) || !*device
) {
1354 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "No context for object [%p]\n",
1361 int acpi_bus_get_device(acpi_handle handle
, struct acpi_device
**device
)
1363 return acpi_get_device_data(handle
, device
, NULL
);
1365 EXPORT_SYMBOL(acpi_bus_get_device
);
1367 static void get_acpi_device(void *dev
)
1370 get_device(&((struct acpi_device
*)dev
)->dev
);
1373 struct acpi_device
*acpi_bus_get_acpi_device(acpi_handle handle
)
1375 struct acpi_device
*adev
= NULL
;
1377 acpi_get_device_data(handle
, &adev
, get_acpi_device
);
1381 void acpi_bus_put_acpi_device(struct acpi_device
*adev
)
1383 put_device(&adev
->dev
);
1386 int acpi_device_add(struct acpi_device
*device
,
1387 void (*release
)(struct device
*))
1390 struct acpi_device_bus_id
*acpi_device_bus_id
, *new_bus_id
;
1393 if (device
->handle
) {
1396 status
= acpi_attach_data(device
->handle
, acpi_scan_drop_device
,
1398 if (ACPI_FAILURE(status
)) {
1399 acpi_handle_err(device
->handle
,
1400 "Unable to attach device data\n");
1408 * Link this device to its parent and siblings.
1410 INIT_LIST_HEAD(&device
->children
);
1411 INIT_LIST_HEAD(&device
->node
);
1412 INIT_LIST_HEAD(&device
->wakeup_list
);
1413 INIT_LIST_HEAD(&device
->physical_node_list
);
1414 INIT_LIST_HEAD(&device
->del_list
);
1415 mutex_init(&device
->physical_node_lock
);
1417 new_bus_id
= kzalloc(sizeof(struct acpi_device_bus_id
), GFP_KERNEL
);
1419 pr_err(PREFIX
"Memory allocation error\n");
1424 mutex_lock(&acpi_device_lock
);
1426 * Find suitable bus_id and instance number in acpi_bus_id_list
1427 * If failed, create one and link it into acpi_bus_id_list
1429 list_for_each_entry(acpi_device_bus_id
, &acpi_bus_id_list
, node
) {
1430 if (!strcmp(acpi_device_bus_id
->bus_id
,
1431 acpi_device_hid(device
))) {
1432 acpi_device_bus_id
->instance_no
++;
1439 acpi_device_bus_id
= new_bus_id
;
1440 strcpy(acpi_device_bus_id
->bus_id
, acpi_device_hid(device
));
1441 acpi_device_bus_id
->instance_no
= 0;
1442 list_add_tail(&acpi_device_bus_id
->node
, &acpi_bus_id_list
);
1444 dev_set_name(&device
->dev
, "%s:%02x", acpi_device_bus_id
->bus_id
, acpi_device_bus_id
->instance_no
);
1447 list_add_tail(&device
->node
, &device
->parent
->children
);
1449 if (device
->wakeup
.flags
.valid
)
1450 list_add_tail(&device
->wakeup_list
, &acpi_wakeup_device_list
);
1451 mutex_unlock(&acpi_device_lock
);
1454 device
->dev
.parent
= &device
->parent
->dev
;
1455 device
->dev
.bus
= &acpi_bus_type
;
1456 device
->dev
.release
= release
;
1457 result
= device_add(&device
->dev
);
1459 dev_err(&device
->dev
, "Error registering device\n");
1463 result
= acpi_device_setup_files(device
);
1465 printk(KERN_ERR PREFIX
"Error creating sysfs interface for device %s\n",
1466 dev_name(&device
->dev
));
1471 mutex_lock(&acpi_device_lock
);
1473 list_del(&device
->node
);
1474 list_del(&device
->wakeup_list
);
1475 mutex_unlock(&acpi_device_lock
);
1478 acpi_detach_data(device
->handle
, acpi_scan_drop_device
);
1482 struct acpi_device
*acpi_get_next_child(struct device
*dev
,
1483 struct acpi_device
*child
)
1485 struct acpi_device
*adev
= ACPI_COMPANION(dev
);
1486 struct list_head
*head
, *next
;
1491 head
= &adev
->children
;
1492 if (list_empty(head
))
1496 return list_first_entry(head
, struct acpi_device
, node
);
1498 next
= child
->node
.next
;
1499 return next
== head
? NULL
: list_entry(next
, struct acpi_device
, node
);
1502 /* --------------------------------------------------------------------------
1504 -------------------------------------------------------------------------- */
1506 * acpi_bus_register_driver - register a driver with the ACPI bus
1507 * @driver: driver being registered
1509 * Registers a driver with the ACPI bus. Searches the namespace for all
1510 * devices that match the driver's criteria and binds. Returns zero for
1511 * success or a negative error status for failure.
1513 int acpi_bus_register_driver(struct acpi_driver
*driver
)
1519 driver
->drv
.name
= driver
->name
;
1520 driver
->drv
.bus
= &acpi_bus_type
;
1521 driver
->drv
.owner
= driver
->owner
;
1523 ret
= driver_register(&driver
->drv
);
1527 EXPORT_SYMBOL(acpi_bus_register_driver
);
1530 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1531 * @driver: driver to unregister
1533 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1534 * devices that match the driver's criteria and unbinds.
1536 void acpi_bus_unregister_driver(struct acpi_driver
*driver
)
1538 driver_unregister(&driver
->drv
);
1541 EXPORT_SYMBOL(acpi_bus_unregister_driver
);
1543 /* --------------------------------------------------------------------------
1545 -------------------------------------------------------------------------- */
1546 static struct acpi_device
*acpi_bus_get_parent(acpi_handle handle
)
1548 struct acpi_device
*device
= NULL
;
1552 * Fixed hardware devices do not appear in the namespace and do not
1553 * have handles, but we fabricate acpi_devices for them, so we have
1554 * to deal with them specially.
1560 status
= acpi_get_parent(handle
, &handle
);
1561 if (ACPI_FAILURE(status
))
1562 return status
== AE_NULL_ENTRY
? NULL
: acpi_root
;
1563 } while (acpi_bus_get_device(handle
, &device
));
1568 acpi_bus_get_ejd(acpi_handle handle
, acpi_handle
*ejd
)
1572 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
1573 union acpi_object
*obj
;
1575 status
= acpi_get_handle(handle
, "_EJD", &tmp
);
1576 if (ACPI_FAILURE(status
))
1579 status
= acpi_evaluate_object(handle
, "_EJD", NULL
, &buffer
);
1580 if (ACPI_SUCCESS(status
)) {
1581 obj
= buffer
.pointer
;
1582 status
= acpi_get_handle(ACPI_ROOT_OBJECT
, obj
->string
.pointer
,
1584 kfree(buffer
.pointer
);
1588 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd
);
1590 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle
,
1591 struct acpi_device_wakeup
*wakeup
)
1593 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1594 union acpi_object
*package
= NULL
;
1595 union acpi_object
*element
= NULL
;
1602 INIT_LIST_HEAD(&wakeup
->resources
);
1605 status
= acpi_evaluate_object(handle
, "_PRW", NULL
, &buffer
);
1606 if (ACPI_FAILURE(status
)) {
1607 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRW"));
1611 package
= (union acpi_object
*)buffer
.pointer
;
1613 if (!package
|| package
->package
.count
< 2)
1616 element
= &(package
->package
.elements
[0]);
1620 if (element
->type
== ACPI_TYPE_PACKAGE
) {
1621 if ((element
->package
.count
< 2) ||
1622 (element
->package
.elements
[0].type
!=
1623 ACPI_TYPE_LOCAL_REFERENCE
)
1624 || (element
->package
.elements
[1].type
!= ACPI_TYPE_INTEGER
))
1627 wakeup
->gpe_device
=
1628 element
->package
.elements
[0].reference
.handle
;
1629 wakeup
->gpe_number
=
1630 (u32
) element
->package
.elements
[1].integer
.value
;
1631 } else if (element
->type
== ACPI_TYPE_INTEGER
) {
1632 wakeup
->gpe_device
= NULL
;
1633 wakeup
->gpe_number
= element
->integer
.value
;
1638 element
= &(package
->package
.elements
[1]);
1639 if (element
->type
!= ACPI_TYPE_INTEGER
)
1642 wakeup
->sleep_state
= element
->integer
.value
;
1644 err
= acpi_extract_power_resources(package
, 2, &wakeup
->resources
);
1648 if (!list_empty(&wakeup
->resources
)) {
1651 err
= acpi_power_wakeup_list_init(&wakeup
->resources
,
1654 acpi_handle_warn(handle
, "Retrieving current states "
1655 "of wakeup power resources failed\n");
1656 acpi_power_resources_list_free(&wakeup
->resources
);
1659 if (sleep_state
< wakeup
->sleep_state
) {
1660 acpi_handle_warn(handle
, "Overriding _PRW sleep state "
1661 "(S%d) by S%d from power resources\n",
1662 (int)wakeup
->sleep_state
, sleep_state
);
1663 wakeup
->sleep_state
= sleep_state
;
1668 kfree(buffer
.pointer
);
1672 static void acpi_wakeup_gpe_init(struct acpi_device
*device
)
1674 struct acpi_device_id button_device_ids
[] = {
1680 struct acpi_device_wakeup
*wakeup
= &device
->wakeup
;
1682 acpi_event_status event_status
;
1684 wakeup
->flags
.notifier_present
= 0;
1686 /* Power button, Lid switch always enable wakeup */
1687 if (!acpi_match_device_ids(device
, button_device_ids
)) {
1688 wakeup
->flags
.run_wake
= 1;
1689 if (!acpi_match_device_ids(device
, &button_device_ids
[1])) {
1690 /* Do not use Lid/sleep button for S5 wakeup */
1691 if (wakeup
->sleep_state
== ACPI_STATE_S5
)
1692 wakeup
->sleep_state
= ACPI_STATE_S4
;
1694 acpi_mark_gpe_for_wake(wakeup
->gpe_device
, wakeup
->gpe_number
);
1695 device_set_wakeup_capable(&device
->dev
, true);
1699 acpi_setup_gpe_for_wake(device
->handle
, wakeup
->gpe_device
,
1700 wakeup
->gpe_number
);
1701 status
= acpi_get_gpe_status(wakeup
->gpe_device
, wakeup
->gpe_number
,
1703 if (ACPI_FAILURE(status
))
1706 wakeup
->flags
.run_wake
= !!(event_status
& ACPI_EVENT_FLAG_HAS_HANDLER
);
1709 static void acpi_bus_get_wakeup_device_flags(struct acpi_device
*device
)
1713 /* Presence of _PRW indicates wake capable */
1714 if (!acpi_has_method(device
->handle
, "_PRW"))
1717 err
= acpi_bus_extract_wakeup_device_power_package(device
->handle
,
1720 dev_err(&device
->dev
, "_PRW evaluation error: %d\n", err
);
1724 device
->wakeup
.flags
.valid
= 1;
1725 device
->wakeup
.prepare_count
= 0;
1726 acpi_wakeup_gpe_init(device
);
1727 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1728 * system for the ACPI device with the _PRW object.
1729 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1730 * So it is necessary to call _DSW object first. Only when it is not
1731 * present will the _PSW object used.
1733 err
= acpi_device_sleep_wake(device
, 0, 0, 0);
1735 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1736 "error in _DSW or _PSW evaluation\n"));
1739 static void acpi_bus_init_power_state(struct acpi_device
*device
, int state
)
1741 struct acpi_device_power_state
*ps
= &device
->power
.states
[state
];
1742 char pathname
[5] = { '_', 'P', 'R', '0' + state
, '\0' };
1743 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1746 INIT_LIST_HEAD(&ps
->resources
);
1748 /* Evaluate "_PRx" to get referenced power resources */
1749 status
= acpi_evaluate_object(device
->handle
, pathname
, NULL
, &buffer
);
1750 if (ACPI_SUCCESS(status
)) {
1751 union acpi_object
*package
= buffer
.pointer
;
1753 if (buffer
.length
&& package
1754 && package
->type
== ACPI_TYPE_PACKAGE
1755 && package
->package
.count
) {
1756 int err
= acpi_extract_power_resources(package
, 0,
1759 device
->power
.flags
.power_resources
= 1;
1761 ACPI_FREE(buffer
.pointer
);
1764 /* Evaluate "_PSx" to see if we can do explicit sets */
1766 if (acpi_has_method(device
->handle
, pathname
))
1767 ps
->flags
.explicit_set
= 1;
1770 * State is valid if there are means to put the device into it.
1771 * D3hot is only valid if _PR3 present.
1773 if (!list_empty(&ps
->resources
)
1774 || (ps
->flags
.explicit_set
&& state
< ACPI_STATE_D3_HOT
)) {
1775 ps
->flags
.valid
= 1;
1776 ps
->flags
.os_accessible
= 1;
1779 ps
->power
= -1; /* Unknown - driver assigned */
1780 ps
->latency
= -1; /* Unknown - driver assigned */
1783 static void acpi_bus_get_power_flags(struct acpi_device
*device
)
1787 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1788 if (!acpi_has_method(device
->handle
, "_PS0") &&
1789 !acpi_has_method(device
->handle
, "_PR0"))
1792 device
->flags
.power_manageable
= 1;
1795 * Power Management Flags
1797 if (acpi_has_method(device
->handle
, "_PSC"))
1798 device
->power
.flags
.explicit_get
= 1;
1800 if (acpi_has_method(device
->handle
, "_IRC"))
1801 device
->power
.flags
.inrush_current
= 1;
1803 if (acpi_has_method(device
->handle
, "_DSW"))
1804 device
->power
.flags
.dsw_present
= 1;
1807 * Enumerate supported power management states
1809 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3_HOT
; i
++)
1810 acpi_bus_init_power_state(device
, i
);
1812 INIT_LIST_HEAD(&device
->power
.states
[ACPI_STATE_D3_COLD
].resources
);
1814 /* Set defaults for D0 and D3 states (always valid) */
1815 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
= 1;
1816 device
->power
.states
[ACPI_STATE_D0
].power
= 100;
1817 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.valid
= 1;
1818 device
->power
.states
[ACPI_STATE_D3_COLD
].power
= 0;
1820 /* Set D3cold's explicit_set flag if _PS3 exists. */
1821 if (device
->power
.states
[ACPI_STATE_D3_HOT
].flags
.explicit_set
)
1822 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.explicit_set
= 1;
1824 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1825 if (device
->power
.states
[ACPI_STATE_D3_HOT
].flags
.explicit_set
||
1826 device
->power
.flags
.power_resources
)
1827 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.os_accessible
= 1;
1829 if (acpi_bus_init_power(device
))
1830 device
->flags
.power_manageable
= 0;
1833 static void acpi_bus_get_flags(struct acpi_device
*device
)
1835 /* Presence of _STA indicates 'dynamic_status' */
1836 if (acpi_has_method(device
->handle
, "_STA"))
1837 device
->flags
.dynamic_status
= 1;
1839 /* Presence of _RMV indicates 'removable' */
1840 if (acpi_has_method(device
->handle
, "_RMV"))
1841 device
->flags
.removable
= 1;
1843 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1844 if (acpi_has_method(device
->handle
, "_EJD") ||
1845 acpi_has_method(device
->handle
, "_EJ0"))
1846 device
->flags
.ejectable
= 1;
1849 static void acpi_device_get_busid(struct acpi_device
*device
)
1851 char bus_id
[5] = { '?', 0 };
1852 struct acpi_buffer buffer
= { sizeof(bus_id
), bus_id
};
1858 * The device's Bus ID is simply the object name.
1859 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1861 if (ACPI_IS_ROOT_DEVICE(device
)) {
1862 strcpy(device
->pnp
.bus_id
, "ACPI");
1866 switch (device
->device_type
) {
1867 case ACPI_BUS_TYPE_POWER_BUTTON
:
1868 strcpy(device
->pnp
.bus_id
, "PWRF");
1870 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1871 strcpy(device
->pnp
.bus_id
, "SLPF");
1874 acpi_get_name(device
->handle
, ACPI_SINGLE_NAME
, &buffer
);
1875 /* Clean up trailing underscores (if any) */
1876 for (i
= 3; i
> 1; i
--) {
1877 if (bus_id
[i
] == '_')
1882 strcpy(device
->pnp
.bus_id
, bus_id
);
1888 * acpi_ata_match - see if an acpi object is an ATA device
1890 * If an acpi object has one of the ACPI ATA methods defined,
1891 * then we can safely call it an ATA device.
1893 bool acpi_ata_match(acpi_handle handle
)
1895 return acpi_has_method(handle
, "_GTF") ||
1896 acpi_has_method(handle
, "_GTM") ||
1897 acpi_has_method(handle
, "_STM") ||
1898 acpi_has_method(handle
, "_SDD");
1902 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1904 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1905 * then we can safely call it an ejectable drive bay
1907 bool acpi_bay_match(acpi_handle handle
)
1909 acpi_handle phandle
;
1911 if (!acpi_has_method(handle
, "_EJ0"))
1913 if (acpi_ata_match(handle
))
1915 if (ACPI_FAILURE(acpi_get_parent(handle
, &phandle
)))
1918 return acpi_ata_match(phandle
);
1921 bool acpi_device_is_battery(struct acpi_device
*adev
)
1923 struct acpi_hardware_id
*hwid
;
1925 list_for_each_entry(hwid
, &adev
->pnp
.ids
, list
)
1926 if (!strcmp("PNP0C0A", hwid
->id
))
1932 static bool is_ejectable_bay(struct acpi_device
*adev
)
1934 acpi_handle handle
= adev
->handle
;
1936 if (acpi_has_method(handle
, "_EJ0") && acpi_device_is_battery(adev
))
1939 return acpi_bay_match(handle
);
1943 * acpi_dock_match - see if an acpi object has a _DCK method
1945 bool acpi_dock_match(acpi_handle handle
)
1947 return acpi_has_method(handle
, "_DCK");
1950 const char *acpi_device_hid(struct acpi_device
*device
)
1952 struct acpi_hardware_id
*hid
;
1954 if (list_empty(&device
->pnp
.ids
))
1957 hid
= list_first_entry(&device
->pnp
.ids
, struct acpi_hardware_id
, list
);
1960 EXPORT_SYMBOL(acpi_device_hid
);
1962 static void acpi_add_id(struct acpi_device_pnp
*pnp
, const char *dev_id
)
1964 struct acpi_hardware_id
*id
;
1966 id
= kmalloc(sizeof(*id
), GFP_KERNEL
);
1970 id
->id
= kstrdup(dev_id
, GFP_KERNEL
);
1976 list_add_tail(&id
->list
, &pnp
->ids
);
1977 pnp
->type
.hardware_id
= 1;
1981 * Old IBM workstations have a DSDT bug wherein the SMBus object
1982 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1983 * prefix. Work around this.
1985 static bool acpi_ibm_smbus_match(acpi_handle handle
)
1987 char node_name
[ACPI_PATH_SEGMENT_LENGTH
];
1988 struct acpi_buffer path
= { sizeof(node_name
), node_name
};
1990 if (!dmi_name_in_vendors("IBM"))
1993 /* Look for SMBS object */
1994 if (ACPI_FAILURE(acpi_get_name(handle
, ACPI_SINGLE_NAME
, &path
)) ||
1995 strcmp("SMBS", path
.pointer
))
1998 /* Does it have the necessary (but misnamed) methods? */
1999 if (acpi_has_method(handle
, "SBI") &&
2000 acpi_has_method(handle
, "SBR") &&
2001 acpi_has_method(handle
, "SBW"))
2007 static bool acpi_object_is_system_bus(acpi_handle handle
)
2011 if (ACPI_SUCCESS(acpi_get_handle(NULL
, "\\_SB", &tmp
)) &&
2014 if (ACPI_SUCCESS(acpi_get_handle(NULL
, "\\_TZ", &tmp
)) &&
2021 static void acpi_set_pnp_ids(acpi_handle handle
, struct acpi_device_pnp
*pnp
,
2025 struct acpi_device_info
*info
;
2026 struct acpi_pnp_device_id_list
*cid_list
;
2029 switch (device_type
) {
2030 case ACPI_BUS_TYPE_DEVICE
:
2031 if (handle
== ACPI_ROOT_OBJECT
) {
2032 acpi_add_id(pnp
, ACPI_SYSTEM_HID
);
2036 status
= acpi_get_object_info(handle
, &info
);
2037 if (ACPI_FAILURE(status
)) {
2038 pr_err(PREFIX
"%s: Error reading device info\n",
2043 if (info
->valid
& ACPI_VALID_HID
) {
2044 acpi_add_id(pnp
, info
->hardware_id
.string
);
2045 pnp
->type
.platform_id
= 1;
2047 if (info
->valid
& ACPI_VALID_CID
) {
2048 cid_list
= &info
->compatible_id_list
;
2049 for (i
= 0; i
< cid_list
->count
; i
++)
2050 acpi_add_id(pnp
, cid_list
->ids
[i
].string
);
2052 if (info
->valid
& ACPI_VALID_ADR
) {
2053 pnp
->bus_address
= info
->address
;
2054 pnp
->type
.bus_address
= 1;
2056 if (info
->valid
& ACPI_VALID_UID
)
2057 pnp
->unique_id
= kstrdup(info
->unique_id
.string
,
2063 * Some devices don't reliably have _HIDs & _CIDs, so add
2064 * synthetic HIDs to make sure drivers can find them.
2066 if (acpi_is_video_device(handle
))
2067 acpi_add_id(pnp
, ACPI_VIDEO_HID
);
2068 else if (acpi_bay_match(handle
))
2069 acpi_add_id(pnp
, ACPI_BAY_HID
);
2070 else if (acpi_dock_match(handle
))
2071 acpi_add_id(pnp
, ACPI_DOCK_HID
);
2072 else if (acpi_ibm_smbus_match(handle
))
2073 acpi_add_id(pnp
, ACPI_SMBUS_IBM_HID
);
2074 else if (list_empty(&pnp
->ids
) &&
2075 acpi_object_is_system_bus(handle
)) {
2076 /* \_SB, \_TZ, LNXSYBUS */
2077 acpi_add_id(pnp
, ACPI_BUS_HID
);
2078 strcpy(pnp
->device_name
, ACPI_BUS_DEVICE_NAME
);
2079 strcpy(pnp
->device_class
, ACPI_BUS_CLASS
);
2083 case ACPI_BUS_TYPE_POWER
:
2084 acpi_add_id(pnp
, ACPI_POWER_HID
);
2086 case ACPI_BUS_TYPE_PROCESSOR
:
2087 acpi_add_id(pnp
, ACPI_PROCESSOR_OBJECT_HID
);
2089 case ACPI_BUS_TYPE_THERMAL
:
2090 acpi_add_id(pnp
, ACPI_THERMAL_HID
);
2092 case ACPI_BUS_TYPE_POWER_BUTTON
:
2093 acpi_add_id(pnp
, ACPI_BUTTON_HID_POWERF
);
2095 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
2096 acpi_add_id(pnp
, ACPI_BUTTON_HID_SLEEPF
);
2101 void acpi_free_pnp_ids(struct acpi_device_pnp
*pnp
)
2103 struct acpi_hardware_id
*id
, *tmp
;
2105 list_for_each_entry_safe(id
, tmp
, &pnp
->ids
, list
) {
2109 kfree(pnp
->unique_id
);
2112 void acpi_init_device_object(struct acpi_device
*device
, acpi_handle handle
,
2113 int type
, unsigned long long sta
)
2115 INIT_LIST_HEAD(&device
->pnp
.ids
);
2116 device
->device_type
= type
;
2117 device
->handle
= handle
;
2118 device
->parent
= acpi_bus_get_parent(handle
);
2119 device
->fwnode
.type
= FWNODE_ACPI
;
2120 acpi_set_device_status(device
, sta
);
2121 acpi_device_get_busid(device
);
2122 acpi_set_pnp_ids(handle
, &device
->pnp
, type
);
2123 acpi_init_properties(device
);
2124 acpi_bus_get_flags(device
);
2125 device
->flags
.match_driver
= false;
2126 device
->flags
.initialized
= true;
2127 device
->flags
.visited
= false;
2128 device_initialize(&device
->dev
);
2129 dev_set_uevent_suppress(&device
->dev
, true);
2132 void acpi_device_add_finalize(struct acpi_device
*device
)
2134 dev_set_uevent_suppress(&device
->dev
, false);
2135 kobject_uevent(&device
->dev
.kobj
, KOBJ_ADD
);
2138 static int acpi_add_single_object(struct acpi_device
**child
,
2139 acpi_handle handle
, int type
,
2140 unsigned long long sta
)
2143 struct acpi_device
*device
;
2144 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
2146 device
= kzalloc(sizeof(struct acpi_device
), GFP_KERNEL
);
2148 printk(KERN_ERR PREFIX
"Memory allocation error\n");
2152 acpi_init_device_object(device
, handle
, type
, sta
);
2153 acpi_bus_get_power_flags(device
);
2154 acpi_bus_get_wakeup_device_flags(device
);
2156 result
= acpi_device_add(device
, acpi_device_release
);
2158 acpi_device_release(&device
->dev
);
2162 acpi_power_add_remove_device(device
, true);
2163 acpi_device_add_finalize(device
);
2164 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
2165 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Added %s [%s] parent %s\n",
2166 dev_name(&device
->dev
), (char *) buffer
.pointer
,
2167 device
->parent
? dev_name(&device
->parent
->dev
) : "(null)"));
2168 kfree(buffer
.pointer
);
2173 static int acpi_bus_type_and_status(acpi_handle handle
, int *type
,
2174 unsigned long long *sta
)
2177 acpi_object_type acpi_type
;
2179 status
= acpi_get_type(handle
, &acpi_type
);
2180 if (ACPI_FAILURE(status
))
2183 switch (acpi_type
) {
2184 case ACPI_TYPE_ANY
: /* for ACPI_ROOT_OBJECT */
2185 case ACPI_TYPE_DEVICE
:
2186 *type
= ACPI_BUS_TYPE_DEVICE
;
2187 status
= acpi_bus_get_status_handle(handle
, sta
);
2188 if (ACPI_FAILURE(status
))
2191 case ACPI_TYPE_PROCESSOR
:
2192 *type
= ACPI_BUS_TYPE_PROCESSOR
;
2193 status
= acpi_bus_get_status_handle(handle
, sta
);
2194 if (ACPI_FAILURE(status
))
2197 case ACPI_TYPE_THERMAL
:
2198 *type
= ACPI_BUS_TYPE_THERMAL
;
2199 *sta
= ACPI_STA_DEFAULT
;
2201 case ACPI_TYPE_POWER
:
2202 *type
= ACPI_BUS_TYPE_POWER
;
2203 *sta
= ACPI_STA_DEFAULT
;
2212 bool acpi_device_is_present(struct acpi_device
*adev
)
2214 if (adev
->status
.present
|| adev
->status
.functional
)
2217 adev
->flags
.initialized
= false;
2221 static bool acpi_scan_handler_matching(struct acpi_scan_handler
*handler
,
2223 const struct acpi_device_id
**matchid
)
2225 const struct acpi_device_id
*devid
;
2228 return handler
->match(idstr
, matchid
);
2230 for (devid
= handler
->ids
; devid
->id
[0]; devid
++)
2231 if (!strcmp((char *)devid
->id
, idstr
)) {
2241 static struct acpi_scan_handler
*acpi_scan_match_handler(char *idstr
,
2242 const struct acpi_device_id
**matchid
)
2244 struct acpi_scan_handler
*handler
;
2246 list_for_each_entry(handler
, &acpi_scan_handlers_list
, list_node
)
2247 if (acpi_scan_handler_matching(handler
, idstr
, matchid
))
2253 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile
*hotplug
, bool val
)
2255 if (!!hotplug
->enabled
== !!val
)
2258 mutex_lock(&acpi_scan_lock
);
2260 hotplug
->enabled
= val
;
2262 mutex_unlock(&acpi_scan_lock
);
2265 static void acpi_scan_init_hotplug(struct acpi_device
*adev
)
2267 struct acpi_hardware_id
*hwid
;
2269 if (acpi_dock_match(adev
->handle
) || is_ejectable_bay(adev
)) {
2270 acpi_dock_add(adev
);
2273 list_for_each_entry(hwid
, &adev
->pnp
.ids
, list
) {
2274 struct acpi_scan_handler
*handler
;
2276 handler
= acpi_scan_match_handler(hwid
->id
, NULL
);
2278 adev
->flags
.hotplug_notify
= true;
2284 static void acpi_device_dep_initialize(struct acpi_device
*adev
)
2286 struct acpi_dep_data
*dep
;
2287 struct acpi_handle_list dep_devices
;
2291 if (!acpi_has_method(adev
->handle
, "_DEP"))
2294 status
= acpi_evaluate_reference(adev
->handle
, "_DEP", NULL
,
2296 if (ACPI_FAILURE(status
)) {
2297 dev_dbg(&adev
->dev
, "Failed to evaluate _DEP.\n");
2301 for (i
= 0; i
< dep_devices
.count
; i
++) {
2302 struct acpi_device_info
*info
;
2305 status
= acpi_get_object_info(dep_devices
.handles
[i
], &info
);
2306 if (ACPI_FAILURE(status
)) {
2307 dev_dbg(&adev
->dev
, "Error reading _DEP device info\n");
2312 * Skip the dependency of Windows System Power
2313 * Management Controller
2315 skip
= info
->valid
& ACPI_VALID_HID
&&
2316 !strcmp(info
->hardware_id
.string
, "INT3396");
2323 dep
= kzalloc(sizeof(struct acpi_dep_data
), GFP_KERNEL
);
2327 dep
->master
= dep_devices
.handles
[i
];
2328 dep
->slave
= adev
->handle
;
2331 mutex_lock(&acpi_dep_list_lock
);
2332 list_add_tail(&dep
->node
, &acpi_dep_list
);
2333 mutex_unlock(&acpi_dep_list_lock
);
2337 static acpi_status
acpi_bus_check_add(acpi_handle handle
, u32 lvl_not_used
,
2338 void *not_used
, void **return_value
)
2340 struct acpi_device
*device
= NULL
;
2342 unsigned long long sta
;
2345 acpi_bus_get_device(handle
, &device
);
2349 result
= acpi_bus_type_and_status(handle
, &type
, &sta
);
2353 if (type
== ACPI_BUS_TYPE_POWER
) {
2354 acpi_add_power_resource(handle
);
2358 acpi_add_single_object(&device
, handle
, type
, sta
);
2360 return AE_CTRL_DEPTH
;
2362 acpi_scan_init_hotplug(device
);
2363 acpi_device_dep_initialize(device
);
2367 *return_value
= device
;
2372 static int acpi_check_spi_i2c_slave(struct acpi_resource
*ares
, void *data
)
2374 bool *is_spi_i2c_slave_p
= data
;
2376 if (ares
->type
!= ACPI_RESOURCE_TYPE_SERIAL_BUS
)
2380 * devices that are connected to UART still need to be enumerated to
2383 if (ares
->data
.common_serial_bus
.type
!= ACPI_RESOURCE_SERIAL_TYPE_UART
)
2384 *is_spi_i2c_slave_p
= true;
2386 /* no need to do more checking */
2390 static void acpi_default_enumeration(struct acpi_device
*device
)
2392 struct list_head resource_list
;
2393 bool is_spi_i2c_slave
= false;
2396 * Do not enemerate SPI/I2C slaves as they will be enuerated by their
2397 * respective parents.
2399 INIT_LIST_HEAD(&resource_list
);
2400 acpi_dev_get_resources(device
, &resource_list
, acpi_check_spi_i2c_slave
,
2402 acpi_dev_free_resource_list(&resource_list
);
2403 if (!is_spi_i2c_slave
)
2404 acpi_create_platform_device(device
);
2407 static const struct acpi_device_id generic_device_ids
[] = {
2412 static int acpi_generic_device_attach(struct acpi_device
*adev
,
2413 const struct acpi_device_id
*not_used
)
2416 * Since PRP0001 is the only ID handled here, the test below can be
2419 if (adev
->data
.of_compatible
)
2420 acpi_default_enumeration(adev
);
2425 static struct acpi_scan_handler generic_device_handler
= {
2426 .ids
= generic_device_ids
,
2427 .attach
= acpi_generic_device_attach
,
2430 static int acpi_scan_attach_handler(struct acpi_device
*device
)
2432 struct acpi_hardware_id
*hwid
;
2435 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
) {
2436 const struct acpi_device_id
*devid
;
2437 struct acpi_scan_handler
*handler
;
2439 handler
= acpi_scan_match_handler(hwid
->id
, &devid
);
2441 if (!handler
->attach
) {
2442 device
->pnp
.type
.platform_id
= 0;
2445 device
->handler
= handler
;
2446 ret
= handler
->attach(device
, devid
);
2450 device
->handler
= NULL
;
2459 static void acpi_bus_attach(struct acpi_device
*device
)
2461 struct acpi_device
*child
;
2465 if (ACPI_SUCCESS(acpi_bus_get_ejd(device
->handle
, &ejd
)))
2466 register_dock_dependent_device(device
, ejd
);
2468 acpi_bus_get_status(device
);
2469 /* Skip devices that are not present. */
2470 if (!acpi_device_is_present(device
)) {
2471 device
->flags
.visited
= false;
2472 device
->flags
.power_manageable
= 0;
2475 if (device
->handler
)
2478 if (!device
->flags
.initialized
) {
2479 device
->flags
.power_manageable
=
2480 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
;
2481 if (acpi_bus_init_power(device
))
2482 device
->flags
.power_manageable
= 0;
2484 device
->flags
.initialized
= true;
2486 device
->flags
.visited
= false;
2487 ret
= acpi_scan_attach_handler(device
);
2491 device
->flags
.match_driver
= true;
2493 ret
= device_attach(&device
->dev
);
2497 if (!ret
&& device
->pnp
.type
.platform_id
)
2498 acpi_default_enumeration(device
);
2500 device
->flags
.visited
= true;
2503 list_for_each_entry(child
, &device
->children
, node
)
2504 acpi_bus_attach(child
);
2506 if (device
->handler
&& device
->handler
->hotplug
.notify_online
)
2507 device
->handler
->hotplug
.notify_online(device
);
2510 void acpi_walk_dep_device_list(acpi_handle handle
)
2512 struct acpi_dep_data
*dep
, *tmp
;
2513 struct acpi_device
*adev
;
2515 mutex_lock(&acpi_dep_list_lock
);
2516 list_for_each_entry_safe(dep
, tmp
, &acpi_dep_list
, node
) {
2517 if (dep
->master
== handle
) {
2518 acpi_bus_get_device(dep
->slave
, &adev
);
2523 if (!adev
->dep_unmet
)
2524 acpi_bus_attach(adev
);
2525 list_del(&dep
->node
);
2529 mutex_unlock(&acpi_dep_list_lock
);
2531 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list
);
2534 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2535 * @handle: Root of the namespace scope to scan.
2537 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2540 * If no devices were found, -ENODEV is returned, but it does not mean that
2541 * there has been a real error. There just have been no suitable ACPI objects
2542 * in the table trunk from which the kernel could create a device and add an
2543 * appropriate driver.
2545 * Must be called under acpi_scan_lock.
2547 int acpi_bus_scan(acpi_handle handle
)
2549 void *device
= NULL
;
2551 if (ACPI_SUCCESS(acpi_bus_check_add(handle
, 0, NULL
, &device
)))
2552 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
2553 acpi_bus_check_add
, NULL
, NULL
, &device
);
2556 acpi_bus_attach(device
);
2561 EXPORT_SYMBOL(acpi_bus_scan
);
2564 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2565 * @adev: Root of the ACPI namespace scope to walk.
2567 * Must be called under acpi_scan_lock.
2569 void acpi_bus_trim(struct acpi_device
*adev
)
2571 struct acpi_scan_handler
*handler
= adev
->handler
;
2572 struct acpi_device
*child
;
2574 list_for_each_entry_reverse(child
, &adev
->children
, node
)
2575 acpi_bus_trim(child
);
2577 adev
->flags
.match_driver
= false;
2579 if (handler
->detach
)
2580 handler
->detach(adev
);
2582 adev
->handler
= NULL
;
2584 device_release_driver(&adev
->dev
);
2587 * Most likely, the device is going away, so put it into D3cold before
2590 acpi_device_set_power(adev
, ACPI_STATE_D3_COLD
);
2591 adev
->flags
.initialized
= false;
2592 adev
->flags
.visited
= false;
2594 EXPORT_SYMBOL_GPL(acpi_bus_trim
);
2596 static int acpi_bus_scan_fixed(void)
2601 * Enumerate all fixed-feature devices.
2603 if (!(acpi_gbl_FADT
.flags
& ACPI_FADT_POWER_BUTTON
)) {
2604 struct acpi_device
*device
= NULL
;
2606 result
= acpi_add_single_object(&device
, NULL
,
2607 ACPI_BUS_TYPE_POWER_BUTTON
,
2612 device
->flags
.match_driver
= true;
2613 result
= device_attach(&device
->dev
);
2617 device_init_wakeup(&device
->dev
, true);
2620 if (!(acpi_gbl_FADT
.flags
& ACPI_FADT_SLEEP_BUTTON
)) {
2621 struct acpi_device
*device
= NULL
;
2623 result
= acpi_add_single_object(&device
, NULL
,
2624 ACPI_BUS_TYPE_SLEEP_BUTTON
,
2629 device
->flags
.match_driver
= true;
2630 result
= device_attach(&device
->dev
);
2633 return result
< 0 ? result
: 0;
2636 int __init
acpi_scan_init(void)
2640 result
= bus_register(&acpi_bus_type
);
2642 /* We don't want to quit even if we failed to add suspend/resume */
2643 printk(KERN_ERR PREFIX
"Could not register bus type\n");
2646 acpi_pci_root_init();
2647 acpi_pci_link_init();
2648 acpi_processor_init();
2651 acpi_cmos_rtc_init();
2652 acpi_container_init();
2653 acpi_memory_hotplug_init();
2655 acpi_int340x_thermal_init();
2657 acpi_scan_add_handler(&generic_device_handler
);
2659 mutex_lock(&acpi_scan_lock
);
2661 * Enumerate devices in the ACPI namespace.
2663 result
= acpi_bus_scan(ACPI_ROOT_OBJECT
);
2667 result
= acpi_bus_get_device(ACPI_ROOT_OBJECT
, &acpi_root
);
2671 /* Fixed feature devices do not exist on HW-reduced platform */
2672 if (!acpi_gbl_reduced_hardware
) {
2673 result
= acpi_bus_scan_fixed();
2675 acpi_detach_data(acpi_root
->handle
,
2676 acpi_scan_drop_device
);
2677 acpi_device_del(acpi_root
);
2678 put_device(&acpi_root
->dev
);
2683 acpi_update_all_gpes();
2686 mutex_unlock(&acpi_scan_lock
);