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_bus_id_list
);
40 static DEFINE_MUTEX(acpi_scan_lock
);
41 static LIST_HEAD(acpi_scan_handlers_list
);
42 DEFINE_MUTEX(acpi_device_lock
);
43 LIST_HEAD(acpi_wakeup_device_list
);
44 static DEFINE_MUTEX(acpi_hp_context_lock
);
46 struct acpi_device_bus_id
{
48 unsigned int instance_no
;
49 struct list_head node
;
52 void acpi_scan_lock_acquire(void)
54 mutex_lock(&acpi_scan_lock
);
56 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire
);
58 void acpi_scan_lock_release(void)
60 mutex_unlock(&acpi_scan_lock
);
62 EXPORT_SYMBOL_GPL(acpi_scan_lock_release
);
64 void acpi_lock_hp_context(void)
66 mutex_lock(&acpi_hp_context_lock
);
69 void acpi_unlock_hp_context(void)
71 mutex_unlock(&acpi_hp_context_lock
);
74 void acpi_initialize_hp_context(struct acpi_device
*adev
,
75 struct acpi_hotplug_context
*hp
,
76 int (*notify
)(struct acpi_device
*, u32
),
77 void (*uevent
)(struct acpi_device
*, u32
))
79 acpi_lock_hp_context();
82 acpi_set_hp_context(adev
, hp
);
83 acpi_unlock_hp_context();
85 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context
);
87 int acpi_scan_add_handler(struct acpi_scan_handler
*handler
)
92 list_add_tail(&handler
->list_node
, &acpi_scan_handlers_list
);
96 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler
*handler
,
97 const char *hotplug_profile_name
)
101 error
= acpi_scan_add_handler(handler
);
105 acpi_sysfs_add_hotplug_profile(&handler
->hotplug
, hotplug_profile_name
);
110 * Creates hid/cid(s) string needed for modalias and uevent
111 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
112 * char *modalias: "acpi:IBM0001:ACPI0001"
113 * Return: 0: no _HID and no _CID
114 * -EINVAL: output error
115 * -ENOMEM: output is truncated
117 static int create_modalias(struct acpi_device
*acpi_dev
, char *modalias
,
122 struct acpi_hardware_id
*id
;
124 if (list_empty(&acpi_dev
->pnp
.ids
))
127 len
= snprintf(modalias
, size
, "acpi:");
130 list_for_each_entry(id
, &acpi_dev
->pnp
.ids
, list
) {
131 count
= snprintf(&modalias
[len
], size
, "%s:", id
->id
);
140 modalias
[len
] = '\0';
145 * acpi_companion_match() - Can we match via ACPI companion device
146 * @dev: Device in question
148 * Check if the given device has an ACPI companion and if that companion has
149 * a valid list of PNP IDs, and if the device is the first (primary) physical
150 * device associated with it.
152 * If multiple physical devices are attached to a single ACPI companion, we need
153 * to be careful. The usage scenario for this kind of relationship is that all
154 * of the physical devices in question use resources provided by the ACPI
155 * companion. A typical case is an MFD device where all the sub-devices share
156 * the parent's ACPI companion. In such cases we can only allow the primary
157 * (first) physical device to be matched with the help of the companion's PNP
160 * Additional physical devices sharing the ACPI companion can still use
161 * resources available from it but they will be matched normally using functions
162 * provided by their bus types (and analogously for their modalias).
164 static bool acpi_companion_match(const struct device
*dev
)
166 struct acpi_device
*adev
;
169 adev
= ACPI_COMPANION(dev
);
173 if (list_empty(&adev
->pnp
.ids
))
176 mutex_lock(&adev
->physical_node_lock
);
177 if (list_empty(&adev
->physical_node_list
)) {
180 const struct acpi_device_physical_node
*node
;
182 node
= list_first_entry(&adev
->physical_node_list
,
183 struct acpi_device_physical_node
, node
);
184 ret
= node
->dev
== dev
;
186 mutex_unlock(&adev
->physical_node_lock
);
192 * Creates uevent modalias field for ACPI enumerated devices.
193 * Because the other buses does not support ACPI HIDs & CIDs.
194 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
195 * "acpi:IBM0001:ACPI0001"
197 int acpi_device_uevent_modalias(struct device
*dev
, struct kobj_uevent_env
*env
)
201 if (!acpi_companion_match(dev
))
204 if (add_uevent_var(env
, "MODALIAS="))
206 len
= create_modalias(ACPI_COMPANION(dev
), &env
->buf
[env
->buflen
- 1],
207 sizeof(env
->buf
) - env
->buflen
);
213 EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias
);
216 * Creates modalias sysfs attribute for ACPI enumerated devices.
217 * Because the other buses does not support ACPI HIDs & CIDs.
218 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
219 * "acpi:IBM0001:ACPI0001"
221 int acpi_device_modalias(struct device
*dev
, char *buf
, int size
)
225 if (!acpi_companion_match(dev
))
228 len
= create_modalias(ACPI_COMPANION(dev
), buf
, size
-1);
234 EXPORT_SYMBOL_GPL(acpi_device_modalias
);
237 acpi_device_modalias_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
238 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
241 len
= create_modalias(acpi_dev
, buf
, 1024);
247 static DEVICE_ATTR(modalias
, 0444, acpi_device_modalias_show
, NULL
);
249 bool acpi_scan_is_offline(struct acpi_device
*adev
, bool uevent
)
251 struct acpi_device_physical_node
*pn
;
254 mutex_lock(&adev
->physical_node_lock
);
256 list_for_each_entry(pn
, &adev
->physical_node_list
, node
)
257 if (device_supports_offline(pn
->dev
) && !pn
->dev
->offline
) {
259 kobject_uevent(&pn
->dev
->kobj
, KOBJ_CHANGE
);
265 mutex_unlock(&adev
->physical_node_lock
);
269 static acpi_status
acpi_bus_offline(acpi_handle handle
, u32 lvl
, void *data
,
272 struct acpi_device
*device
= NULL
;
273 struct acpi_device_physical_node
*pn
;
274 bool second_pass
= (bool)data
;
275 acpi_status status
= AE_OK
;
277 if (acpi_bus_get_device(handle
, &device
))
280 if (device
->handler
&& !device
->handler
->hotplug
.enabled
) {
281 *ret_p
= &device
->dev
;
285 mutex_lock(&device
->physical_node_lock
);
287 list_for_each_entry(pn
, &device
->physical_node_list
, node
) {
291 /* Skip devices offlined by the first pass. */
295 pn
->put_online
= false;
297 ret
= device_offline(pn
->dev
);
298 if (acpi_force_hot_remove
)
302 pn
->put_online
= !ret
;
312 mutex_unlock(&device
->physical_node_lock
);
317 static acpi_status
acpi_bus_online(acpi_handle handle
, u32 lvl
, void *data
,
320 struct acpi_device
*device
= NULL
;
321 struct acpi_device_physical_node
*pn
;
323 if (acpi_bus_get_device(handle
, &device
))
326 mutex_lock(&device
->physical_node_lock
);
328 list_for_each_entry(pn
, &device
->physical_node_list
, node
)
329 if (pn
->put_online
) {
330 device_online(pn
->dev
);
331 pn
->put_online
= false;
334 mutex_unlock(&device
->physical_node_lock
);
339 static int acpi_scan_try_to_offline(struct acpi_device
*device
)
341 acpi_handle handle
= device
->handle
;
342 struct device
*errdev
= NULL
;
346 * Carry out two passes here and ignore errors in the first pass,
347 * because if the devices in question are memory blocks and
348 * CONFIG_MEMCG is set, one of the blocks may hold data structures
349 * that the other blocks depend on, but it is not known in advance which
352 * If the first pass is successful, the second one isn't needed, though.
354 status
= acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
355 NULL
, acpi_bus_offline
, (void *)false,
357 if (status
== AE_SUPPORT
) {
358 dev_warn(errdev
, "Offline disabled.\n");
359 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
360 acpi_bus_online
, NULL
, NULL
, NULL
);
363 acpi_bus_offline(handle
, 0, (void *)false, (void **)&errdev
);
366 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
367 NULL
, acpi_bus_offline
, (void *)true,
369 if (!errdev
|| acpi_force_hot_remove
)
370 acpi_bus_offline(handle
, 0, (void *)true,
373 if (errdev
&& !acpi_force_hot_remove
) {
374 dev_warn(errdev
, "Offline failed.\n");
375 acpi_bus_online(handle
, 0, NULL
, NULL
);
376 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
,
377 ACPI_UINT32_MAX
, acpi_bus_online
,
385 static int acpi_scan_hot_remove(struct acpi_device
*device
)
387 acpi_handle handle
= device
->handle
;
388 unsigned long long sta
;
391 if (device
->handler
&& device
->handler
->hotplug
.demand_offline
392 && !acpi_force_hot_remove
) {
393 if (!acpi_scan_is_offline(device
, true))
396 int error
= acpi_scan_try_to_offline(device
);
401 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
402 "Hot-removing device %s...\n", dev_name(&device
->dev
)));
404 acpi_bus_trim(device
);
406 acpi_evaluate_lck(handle
, 0);
410 status
= acpi_evaluate_ej0(handle
);
411 if (status
== AE_NOT_FOUND
)
413 else if (ACPI_FAILURE(status
))
417 * Verify if eject was indeed successful. If not, log an error
418 * message. No need to call _OST since _EJ0 call was made OK.
420 status
= acpi_evaluate_integer(handle
, "_STA", NULL
, &sta
);
421 if (ACPI_FAILURE(status
)) {
422 acpi_handle_warn(handle
,
423 "Status check after eject failed (0x%x)\n", status
);
424 } else if (sta
& ACPI_STA_DEVICE_ENABLED
) {
425 acpi_handle_warn(handle
,
426 "Eject incomplete - status 0x%llx\n", sta
);
432 static int acpi_scan_device_not_present(struct acpi_device
*adev
)
434 if (!acpi_device_enumerated(adev
)) {
435 dev_warn(&adev
->dev
, "Still not present\n");
442 static int acpi_scan_device_check(struct acpi_device
*adev
)
446 acpi_bus_get_status(adev
);
447 if (adev
->status
.present
|| adev
->status
.functional
) {
449 * This function is only called for device objects for which
450 * matching scan handlers exist. The only situation in which
451 * the scan handler is not attached to this device object yet
452 * is when the device has just appeared (either it wasn't
453 * present at all before or it was removed and then added
457 dev_warn(&adev
->dev
, "Already enumerated\n");
460 error
= acpi_bus_scan(adev
->handle
);
462 dev_warn(&adev
->dev
, "Namespace scan failure\n");
465 if (!adev
->handler
) {
466 dev_warn(&adev
->dev
, "Enumeration failure\n");
470 error
= acpi_scan_device_not_present(adev
);
475 static int acpi_scan_bus_check(struct acpi_device
*adev
)
477 struct acpi_scan_handler
*handler
= adev
->handler
;
478 struct acpi_device
*child
;
481 acpi_bus_get_status(adev
);
482 if (!(adev
->status
.present
|| adev
->status
.functional
)) {
483 acpi_scan_device_not_present(adev
);
486 if (handler
&& handler
->hotplug
.scan_dependent
)
487 return handler
->hotplug
.scan_dependent(adev
);
489 error
= acpi_bus_scan(adev
->handle
);
491 dev_warn(&adev
->dev
, "Namespace scan failure\n");
494 list_for_each_entry(child
, &adev
->children
, node
) {
495 error
= acpi_scan_bus_check(child
);
502 static int acpi_generic_hotplug_event(struct acpi_device
*adev
, u32 type
)
505 case ACPI_NOTIFY_BUS_CHECK
:
506 return acpi_scan_bus_check(adev
);
507 case ACPI_NOTIFY_DEVICE_CHECK
:
508 return acpi_scan_device_check(adev
);
509 case ACPI_NOTIFY_EJECT_REQUEST
:
510 case ACPI_OST_EC_OSPM_EJECT
:
511 if (adev
->handler
&& !adev
->handler
->hotplug
.enabled
) {
512 dev_info(&adev
->dev
, "Eject disabled\n");
515 acpi_evaluate_ost(adev
->handle
, ACPI_NOTIFY_EJECT_REQUEST
,
516 ACPI_OST_SC_EJECT_IN_PROGRESS
, NULL
);
517 return acpi_scan_hot_remove(adev
);
522 void acpi_device_hotplug(struct acpi_device
*adev
, u32 src
)
524 u32 ost_code
= ACPI_OST_SC_NON_SPECIFIC_FAILURE
;
527 lock_device_hotplug();
528 mutex_lock(&acpi_scan_lock
);
531 * The device object's ACPI handle cannot become invalid as long as we
532 * are holding acpi_scan_lock, but it might have become invalid before
533 * that lock was acquired.
535 if (adev
->handle
== INVALID_ACPI_HANDLE
)
538 if (adev
->flags
.is_dock_station
) {
539 error
= dock_notify(adev
, src
);
540 } else if (adev
->flags
.hotplug_notify
) {
541 error
= acpi_generic_hotplug_event(adev
, src
);
542 if (error
== -EPERM
) {
543 ost_code
= ACPI_OST_SC_EJECT_NOT_SUPPORTED
;
547 int (*notify
)(struct acpi_device
*, u32
);
549 acpi_lock_hp_context();
550 notify
= adev
->hp
? adev
->hp
->notify
: NULL
;
551 acpi_unlock_hp_context();
553 * There may be additional notify handlers for device objects
554 * without the .event() callback, so ignore them here.
557 error
= notify(adev
, src
);
562 ost_code
= ACPI_OST_SC_SUCCESS
;
565 acpi_evaluate_ost(adev
->handle
, src
, ost_code
, NULL
);
568 acpi_bus_put_acpi_device(adev
);
569 mutex_unlock(&acpi_scan_lock
);
570 unlock_device_hotplug();
573 static ssize_t
real_power_state_show(struct device
*dev
,
574 struct device_attribute
*attr
, char *buf
)
576 struct acpi_device
*adev
= to_acpi_device(dev
);
580 ret
= acpi_device_get_power(adev
, &state
);
584 return sprintf(buf
, "%s\n", acpi_power_state_string(state
));
587 static DEVICE_ATTR(real_power_state
, 0444, real_power_state_show
, NULL
);
589 static ssize_t
power_state_show(struct device
*dev
,
590 struct device_attribute
*attr
, char *buf
)
592 struct acpi_device
*adev
= to_acpi_device(dev
);
594 return sprintf(buf
, "%s\n", acpi_power_state_string(adev
->power
.state
));
597 static DEVICE_ATTR(power_state
, 0444, power_state_show
, NULL
);
600 acpi_eject_store(struct device
*d
, struct device_attribute
*attr
,
601 const char *buf
, size_t count
)
603 struct acpi_device
*acpi_device
= to_acpi_device(d
);
604 acpi_object_type not_used
;
607 if (!count
|| buf
[0] != '1')
610 if ((!acpi_device
->handler
|| !acpi_device
->handler
->hotplug
.enabled
)
611 && !acpi_device
->driver
)
614 status
= acpi_get_type(acpi_device
->handle
, ¬_used
);
615 if (ACPI_FAILURE(status
) || !acpi_device
->flags
.ejectable
)
618 get_device(&acpi_device
->dev
);
619 status
= acpi_hotplug_schedule(acpi_device
, ACPI_OST_EC_OSPM_EJECT
);
620 if (ACPI_SUCCESS(status
))
623 put_device(&acpi_device
->dev
);
624 acpi_evaluate_ost(acpi_device
->handle
, ACPI_OST_EC_OSPM_EJECT
,
625 ACPI_OST_SC_NON_SPECIFIC_FAILURE
, NULL
);
626 return status
== AE_NO_MEMORY
? -ENOMEM
: -EAGAIN
;
629 static DEVICE_ATTR(eject
, 0200, NULL
, acpi_eject_store
);
632 acpi_device_hid_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
633 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
635 return sprintf(buf
, "%s\n", acpi_device_hid(acpi_dev
));
637 static DEVICE_ATTR(hid
, 0444, acpi_device_hid_show
, NULL
);
639 static ssize_t
acpi_device_uid_show(struct device
*dev
,
640 struct device_attribute
*attr
, char *buf
)
642 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
644 return sprintf(buf
, "%s\n", acpi_dev
->pnp
.unique_id
);
646 static DEVICE_ATTR(uid
, 0444, acpi_device_uid_show
, NULL
);
648 static ssize_t
acpi_device_adr_show(struct device
*dev
,
649 struct device_attribute
*attr
, char *buf
)
651 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
653 return sprintf(buf
, "0x%08x\n",
654 (unsigned int)(acpi_dev
->pnp
.bus_address
));
656 static DEVICE_ATTR(adr
, 0444, acpi_device_adr_show
, NULL
);
659 acpi_device_path_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
) {
660 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
661 struct acpi_buffer path
= {ACPI_ALLOCATE_BUFFER
, NULL
};
664 result
= acpi_get_name(acpi_dev
->handle
, ACPI_FULL_PATHNAME
, &path
);
668 result
= sprintf(buf
, "%s\n", (char*)path
.pointer
);
673 static DEVICE_ATTR(path
, 0444, acpi_device_path_show
, NULL
);
675 /* sysfs file that shows description text from the ACPI _STR method */
676 static ssize_t
description_show(struct device
*dev
,
677 struct device_attribute
*attr
,
679 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
682 if (acpi_dev
->pnp
.str_obj
== NULL
)
686 * The _STR object contains a Unicode identifier for a device.
687 * We need to convert to utf-8 so it can be displayed.
689 result
= utf16s_to_utf8s(
690 (wchar_t *)acpi_dev
->pnp
.str_obj
->buffer
.pointer
,
691 acpi_dev
->pnp
.str_obj
->buffer
.length
,
692 UTF16_LITTLE_ENDIAN
, buf
,
695 buf
[result
++] = '\n';
699 static DEVICE_ATTR(description
, 0444, description_show
, NULL
);
702 acpi_device_sun_show(struct device
*dev
, struct device_attribute
*attr
,
704 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
706 unsigned long long sun
;
708 status
= acpi_evaluate_integer(acpi_dev
->handle
, "_SUN", NULL
, &sun
);
709 if (ACPI_FAILURE(status
))
712 return sprintf(buf
, "%llu\n", sun
);
714 static DEVICE_ATTR(sun
, 0444, acpi_device_sun_show
, NULL
);
716 static ssize_t
status_show(struct device
*dev
, struct device_attribute
*attr
,
718 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
720 unsigned long long sta
;
722 status
= acpi_evaluate_integer(acpi_dev
->handle
, "_STA", NULL
, &sta
);
723 if (ACPI_FAILURE(status
))
726 return sprintf(buf
, "%llu\n", sta
);
728 static DEVICE_ATTR_RO(status
);
730 static int acpi_device_setup_files(struct acpi_device
*dev
)
732 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
737 * Devices gotten from FADT don't have a "path" attribute
740 result
= device_create_file(&dev
->dev
, &dev_attr_path
);
745 if (!list_empty(&dev
->pnp
.ids
)) {
746 result
= device_create_file(&dev
->dev
, &dev_attr_hid
);
750 result
= device_create_file(&dev
->dev
, &dev_attr_modalias
);
756 * If device has _STR, 'description' file is created
758 if (acpi_has_method(dev
->handle
, "_STR")) {
759 status
= acpi_evaluate_object(dev
->handle
, "_STR",
761 if (ACPI_FAILURE(status
))
762 buffer
.pointer
= NULL
;
763 dev
->pnp
.str_obj
= buffer
.pointer
;
764 result
= device_create_file(&dev
->dev
, &dev_attr_description
);
769 if (dev
->pnp
.type
.bus_address
)
770 result
= device_create_file(&dev
->dev
, &dev_attr_adr
);
771 if (dev
->pnp
.unique_id
)
772 result
= device_create_file(&dev
->dev
, &dev_attr_uid
);
774 if (acpi_has_method(dev
->handle
, "_SUN")) {
775 result
= device_create_file(&dev
->dev
, &dev_attr_sun
);
780 if (acpi_has_method(dev
->handle
, "_STA")) {
781 result
= device_create_file(&dev
->dev
, &dev_attr_status
);
787 * If device has _EJ0, 'eject' file is created that is used to trigger
788 * hot-removal function from userland.
790 if (acpi_has_method(dev
->handle
, "_EJ0")) {
791 result
= device_create_file(&dev
->dev
, &dev_attr_eject
);
796 if (dev
->flags
.power_manageable
) {
797 result
= device_create_file(&dev
->dev
, &dev_attr_power_state
);
801 if (dev
->power
.flags
.power_resources
)
802 result
= device_create_file(&dev
->dev
,
803 &dev_attr_real_power_state
);
810 static void acpi_device_remove_files(struct acpi_device
*dev
)
812 if (dev
->flags
.power_manageable
) {
813 device_remove_file(&dev
->dev
, &dev_attr_power_state
);
814 if (dev
->power
.flags
.power_resources
)
815 device_remove_file(&dev
->dev
,
816 &dev_attr_real_power_state
);
820 * If device has _STR, remove 'description' file
822 if (acpi_has_method(dev
->handle
, "_STR")) {
823 kfree(dev
->pnp
.str_obj
);
824 device_remove_file(&dev
->dev
, &dev_attr_description
);
827 * If device has _EJ0, remove 'eject' file.
829 if (acpi_has_method(dev
->handle
, "_EJ0"))
830 device_remove_file(&dev
->dev
, &dev_attr_eject
);
832 if (acpi_has_method(dev
->handle
, "_SUN"))
833 device_remove_file(&dev
->dev
, &dev_attr_sun
);
835 if (dev
->pnp
.unique_id
)
836 device_remove_file(&dev
->dev
, &dev_attr_uid
);
837 if (dev
->pnp
.type
.bus_address
)
838 device_remove_file(&dev
->dev
, &dev_attr_adr
);
839 device_remove_file(&dev
->dev
, &dev_attr_modalias
);
840 device_remove_file(&dev
->dev
, &dev_attr_hid
);
841 if (acpi_has_method(dev
->handle
, "_STA"))
842 device_remove_file(&dev
->dev
, &dev_attr_status
);
844 device_remove_file(&dev
->dev
, &dev_attr_path
);
846 /* --------------------------------------------------------------------------
848 -------------------------------------------------------------------------- */
850 static const struct acpi_device_id
*__acpi_match_device(
851 struct acpi_device
*device
, const struct acpi_device_id
*ids
)
853 const struct acpi_device_id
*id
;
854 struct acpi_hardware_id
*hwid
;
857 * If the device is not present, it is unnecessary to load device
860 if (!device
->status
.present
)
863 for (id
= ids
; id
->id
[0]; id
++)
864 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
)
865 if (!strcmp((char *) id
->id
, hwid
->id
))
872 * acpi_match_device - Match a struct device against a given list of ACPI IDs
873 * @ids: Array of struct acpi_device_id object to match against.
874 * @dev: The device structure to match.
876 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
877 * object for that handle and use that object to match against a given list of
880 * Return a pointer to the first matching ID on success or %NULL on failure.
882 const struct acpi_device_id
*acpi_match_device(const struct acpi_device_id
*ids
,
883 const struct device
*dev
)
885 struct acpi_device
*adev
;
886 acpi_handle handle
= ACPI_HANDLE(dev
);
888 if (!ids
|| !handle
|| acpi_bus_get_device(handle
, &adev
))
891 if (!acpi_companion_match(dev
))
894 return __acpi_match_device(adev
, ids
);
896 EXPORT_SYMBOL_GPL(acpi_match_device
);
898 int acpi_match_device_ids(struct acpi_device
*device
,
899 const struct acpi_device_id
*ids
)
901 return __acpi_match_device(device
, ids
) ? 0 : -ENOENT
;
903 EXPORT_SYMBOL(acpi_match_device_ids
);
905 static void acpi_free_power_resources_lists(struct acpi_device
*device
)
909 if (device
->wakeup
.flags
.valid
)
910 acpi_power_resources_list_free(&device
->wakeup
.resources
);
912 if (!device
->flags
.power_manageable
)
915 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3_HOT
; i
++) {
916 struct acpi_device_power_state
*ps
= &device
->power
.states
[i
];
917 acpi_power_resources_list_free(&ps
->resources
);
921 static void acpi_device_release(struct device
*dev
)
923 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
925 acpi_free_pnp_ids(&acpi_dev
->pnp
);
926 acpi_free_power_resources_lists(acpi_dev
);
930 static int acpi_bus_match(struct device
*dev
, struct device_driver
*drv
)
932 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
933 struct acpi_driver
*acpi_drv
= to_acpi_driver(drv
);
935 return acpi_dev
->flags
.match_driver
936 && !acpi_match_device_ids(acpi_dev
, acpi_drv
->ids
);
939 static int acpi_device_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
941 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
944 if (list_empty(&acpi_dev
->pnp
.ids
))
947 if (add_uevent_var(env
, "MODALIAS="))
949 len
= create_modalias(acpi_dev
, &env
->buf
[env
->buflen
- 1],
950 sizeof(env
->buf
) - env
->buflen
);
957 static void acpi_device_notify(acpi_handle handle
, u32 event
, void *data
)
959 struct acpi_device
*device
= data
;
961 device
->driver
->ops
.notify(device
, event
);
964 static void acpi_device_notify_fixed(void *data
)
966 struct acpi_device
*device
= data
;
968 /* Fixed hardware devices have no handles */
969 acpi_device_notify(NULL
, ACPI_FIXED_HARDWARE_EVENT
, device
);
972 static acpi_status
acpi_device_fixed_event(void *data
)
974 acpi_os_execute(OSL_NOTIFY_HANDLER
, acpi_device_notify_fixed
, data
);
978 static int acpi_device_install_notify_handler(struct acpi_device
*device
)
982 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
984 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
985 acpi_device_fixed_event
,
987 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
989 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
990 acpi_device_fixed_event
,
993 status
= acpi_install_notify_handler(device
->handle
,
998 if (ACPI_FAILURE(status
))
1003 static void acpi_device_remove_notify_handler(struct acpi_device
*device
)
1005 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
1006 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
1007 acpi_device_fixed_event
);
1008 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
1009 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
1010 acpi_device_fixed_event
);
1012 acpi_remove_notify_handler(device
->handle
, ACPI_DEVICE_NOTIFY
,
1013 acpi_device_notify
);
1016 static int acpi_device_probe(struct device
*dev
)
1018 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
1019 struct acpi_driver
*acpi_drv
= to_acpi_driver(dev
->driver
);
1022 if (acpi_dev
->handler
&& !acpi_is_pnp_device(acpi_dev
))
1025 if (!acpi_drv
->ops
.add
)
1028 ret
= acpi_drv
->ops
.add(acpi_dev
);
1032 acpi_dev
->driver
= acpi_drv
;
1033 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1034 "Driver [%s] successfully bound to device [%s]\n",
1035 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
1037 if (acpi_drv
->ops
.notify
) {
1038 ret
= acpi_device_install_notify_handler(acpi_dev
);
1040 if (acpi_drv
->ops
.remove
)
1041 acpi_drv
->ops
.remove(acpi_dev
);
1043 acpi_dev
->driver
= NULL
;
1044 acpi_dev
->driver_data
= NULL
;
1049 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found driver [%s] for device [%s]\n",
1050 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
1055 static int acpi_device_remove(struct device
* dev
)
1057 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
1058 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
1061 if (acpi_drv
->ops
.notify
)
1062 acpi_device_remove_notify_handler(acpi_dev
);
1063 if (acpi_drv
->ops
.remove
)
1064 acpi_drv
->ops
.remove(acpi_dev
);
1066 acpi_dev
->driver
= NULL
;
1067 acpi_dev
->driver_data
= NULL
;
1073 struct bus_type acpi_bus_type
= {
1075 .match
= acpi_bus_match
,
1076 .probe
= acpi_device_probe
,
1077 .remove
= acpi_device_remove
,
1078 .uevent
= acpi_device_uevent
,
1081 static void acpi_device_del(struct acpi_device
*device
)
1083 mutex_lock(&acpi_device_lock
);
1085 list_del(&device
->node
);
1087 list_del(&device
->wakeup_list
);
1088 mutex_unlock(&acpi_device_lock
);
1090 acpi_power_add_remove_device(device
, false);
1091 acpi_device_remove_files(device
);
1093 device
->remove(device
);
1095 device_del(&device
->dev
);
1098 static LIST_HEAD(acpi_device_del_list
);
1099 static DEFINE_MUTEX(acpi_device_del_lock
);
1101 static void acpi_device_del_work_fn(struct work_struct
*work_not_used
)
1104 struct acpi_device
*adev
;
1106 mutex_lock(&acpi_device_del_lock
);
1108 if (list_empty(&acpi_device_del_list
)) {
1109 mutex_unlock(&acpi_device_del_lock
);
1112 adev
= list_first_entry(&acpi_device_del_list
,
1113 struct acpi_device
, del_list
);
1114 list_del(&adev
->del_list
);
1116 mutex_unlock(&acpi_device_del_lock
);
1118 acpi_device_del(adev
);
1120 * Drop references to all power resources that might have been
1121 * used by the device.
1123 acpi_power_transition(adev
, ACPI_STATE_D3_COLD
);
1124 put_device(&adev
->dev
);
1129 * acpi_scan_drop_device - Drop an ACPI device object.
1130 * @handle: Handle of an ACPI namespace node, not used.
1131 * @context: Address of the ACPI device object to drop.
1133 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
1134 * namespace node the device object pointed to by @context is attached to.
1136 * The unregistration is carried out asynchronously to avoid running
1137 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
1138 * ensure the correct ordering (the device objects must be unregistered in the
1139 * same order in which the corresponding namespace nodes are deleted).
1141 static void acpi_scan_drop_device(acpi_handle handle
, void *context
)
1143 static DECLARE_WORK(work
, acpi_device_del_work_fn
);
1144 struct acpi_device
*adev
= context
;
1146 mutex_lock(&acpi_device_del_lock
);
1149 * Use the ACPI hotplug workqueue which is ordered, so this work item
1150 * won't run after any hotplug work items submitted subsequently. That
1151 * prevents attempts to register device objects identical to those being
1152 * deleted from happening concurrently (such attempts result from
1153 * hotplug events handled via the ACPI hotplug workqueue). It also will
1154 * run after all of the work items submitted previosuly, which helps
1155 * those work items to ensure that they are not accessing stale device
1158 if (list_empty(&acpi_device_del_list
))
1159 acpi_queue_hotplug_work(&work
);
1161 list_add_tail(&adev
->del_list
, &acpi_device_del_list
);
1162 /* Make acpi_ns_validate_handle() return NULL for this handle. */
1163 adev
->handle
= INVALID_ACPI_HANDLE
;
1165 mutex_unlock(&acpi_device_del_lock
);
1168 static int acpi_get_device_data(acpi_handle handle
, struct acpi_device
**device
,
1169 void (*callback
)(void *))
1176 status
= acpi_get_data_full(handle
, acpi_scan_drop_device
,
1177 (void **)device
, callback
);
1178 if (ACPI_FAILURE(status
) || !*device
) {
1179 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "No context for object [%p]\n",
1186 int acpi_bus_get_device(acpi_handle handle
, struct acpi_device
**device
)
1188 return acpi_get_device_data(handle
, device
, NULL
);
1190 EXPORT_SYMBOL(acpi_bus_get_device
);
1192 static void get_acpi_device(void *dev
)
1195 get_device(&((struct acpi_device
*)dev
)->dev
);
1198 struct acpi_device
*acpi_bus_get_acpi_device(acpi_handle handle
)
1200 struct acpi_device
*adev
= NULL
;
1202 acpi_get_device_data(handle
, &adev
, get_acpi_device
);
1206 void acpi_bus_put_acpi_device(struct acpi_device
*adev
)
1208 put_device(&adev
->dev
);
1211 int acpi_device_add(struct acpi_device
*device
,
1212 void (*release
)(struct device
*))
1215 struct acpi_device_bus_id
*acpi_device_bus_id
, *new_bus_id
;
1218 if (device
->handle
) {
1221 status
= acpi_attach_data(device
->handle
, acpi_scan_drop_device
,
1223 if (ACPI_FAILURE(status
)) {
1224 acpi_handle_err(device
->handle
,
1225 "Unable to attach device data\n");
1233 * Link this device to its parent and siblings.
1235 INIT_LIST_HEAD(&device
->children
);
1236 INIT_LIST_HEAD(&device
->node
);
1237 INIT_LIST_HEAD(&device
->wakeup_list
);
1238 INIT_LIST_HEAD(&device
->physical_node_list
);
1239 INIT_LIST_HEAD(&device
->del_list
);
1240 mutex_init(&device
->physical_node_lock
);
1242 new_bus_id
= kzalloc(sizeof(struct acpi_device_bus_id
), GFP_KERNEL
);
1244 pr_err(PREFIX
"Memory allocation error\n");
1249 mutex_lock(&acpi_device_lock
);
1251 * Find suitable bus_id and instance number in acpi_bus_id_list
1252 * If failed, create one and link it into acpi_bus_id_list
1254 list_for_each_entry(acpi_device_bus_id
, &acpi_bus_id_list
, node
) {
1255 if (!strcmp(acpi_device_bus_id
->bus_id
,
1256 acpi_device_hid(device
))) {
1257 acpi_device_bus_id
->instance_no
++;
1264 acpi_device_bus_id
= new_bus_id
;
1265 strcpy(acpi_device_bus_id
->bus_id
, acpi_device_hid(device
));
1266 acpi_device_bus_id
->instance_no
= 0;
1267 list_add_tail(&acpi_device_bus_id
->node
, &acpi_bus_id_list
);
1269 dev_set_name(&device
->dev
, "%s:%02x", acpi_device_bus_id
->bus_id
, acpi_device_bus_id
->instance_no
);
1272 list_add_tail(&device
->node
, &device
->parent
->children
);
1274 if (device
->wakeup
.flags
.valid
)
1275 list_add_tail(&device
->wakeup_list
, &acpi_wakeup_device_list
);
1276 mutex_unlock(&acpi_device_lock
);
1279 device
->dev
.parent
= &device
->parent
->dev
;
1280 device
->dev
.bus
= &acpi_bus_type
;
1281 device
->dev
.release
= release
;
1282 result
= device_add(&device
->dev
);
1284 dev_err(&device
->dev
, "Error registering device\n");
1288 result
= acpi_device_setup_files(device
);
1290 printk(KERN_ERR PREFIX
"Error creating sysfs interface for device %s\n",
1291 dev_name(&device
->dev
));
1296 mutex_lock(&acpi_device_lock
);
1298 list_del(&device
->node
);
1299 list_del(&device
->wakeup_list
);
1300 mutex_unlock(&acpi_device_lock
);
1303 acpi_detach_data(device
->handle
, acpi_scan_drop_device
);
1307 /* --------------------------------------------------------------------------
1309 -------------------------------------------------------------------------- */
1311 * acpi_bus_register_driver - register a driver with the ACPI bus
1312 * @driver: driver being registered
1314 * Registers a driver with the ACPI bus. Searches the namespace for all
1315 * devices that match the driver's criteria and binds. Returns zero for
1316 * success or a negative error status for failure.
1318 int acpi_bus_register_driver(struct acpi_driver
*driver
)
1324 driver
->drv
.name
= driver
->name
;
1325 driver
->drv
.bus
= &acpi_bus_type
;
1326 driver
->drv
.owner
= driver
->owner
;
1328 ret
= driver_register(&driver
->drv
);
1332 EXPORT_SYMBOL(acpi_bus_register_driver
);
1335 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1336 * @driver: driver to unregister
1338 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1339 * devices that match the driver's criteria and unbinds.
1341 void acpi_bus_unregister_driver(struct acpi_driver
*driver
)
1343 driver_unregister(&driver
->drv
);
1346 EXPORT_SYMBOL(acpi_bus_unregister_driver
);
1348 /* --------------------------------------------------------------------------
1350 -------------------------------------------------------------------------- */
1351 static struct acpi_device
*acpi_bus_get_parent(acpi_handle handle
)
1353 struct acpi_device
*device
= NULL
;
1357 * Fixed hardware devices do not appear in the namespace and do not
1358 * have handles, but we fabricate acpi_devices for them, so we have
1359 * to deal with them specially.
1365 status
= acpi_get_parent(handle
, &handle
);
1366 if (ACPI_FAILURE(status
))
1367 return status
== AE_NULL_ENTRY
? NULL
: acpi_root
;
1368 } while (acpi_bus_get_device(handle
, &device
));
1373 acpi_bus_get_ejd(acpi_handle handle
, acpi_handle
*ejd
)
1377 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
1378 union acpi_object
*obj
;
1380 status
= acpi_get_handle(handle
, "_EJD", &tmp
);
1381 if (ACPI_FAILURE(status
))
1384 status
= acpi_evaluate_object(handle
, "_EJD", NULL
, &buffer
);
1385 if (ACPI_SUCCESS(status
)) {
1386 obj
= buffer
.pointer
;
1387 status
= acpi_get_handle(ACPI_ROOT_OBJECT
, obj
->string
.pointer
,
1389 kfree(buffer
.pointer
);
1393 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd
);
1395 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle
,
1396 struct acpi_device_wakeup
*wakeup
)
1398 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1399 union acpi_object
*package
= NULL
;
1400 union acpi_object
*element
= NULL
;
1407 INIT_LIST_HEAD(&wakeup
->resources
);
1410 status
= acpi_evaluate_object(handle
, "_PRW", NULL
, &buffer
);
1411 if (ACPI_FAILURE(status
)) {
1412 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRW"));
1416 package
= (union acpi_object
*)buffer
.pointer
;
1418 if (!package
|| package
->package
.count
< 2)
1421 element
= &(package
->package
.elements
[0]);
1425 if (element
->type
== ACPI_TYPE_PACKAGE
) {
1426 if ((element
->package
.count
< 2) ||
1427 (element
->package
.elements
[0].type
!=
1428 ACPI_TYPE_LOCAL_REFERENCE
)
1429 || (element
->package
.elements
[1].type
!= ACPI_TYPE_INTEGER
))
1432 wakeup
->gpe_device
=
1433 element
->package
.elements
[0].reference
.handle
;
1434 wakeup
->gpe_number
=
1435 (u32
) element
->package
.elements
[1].integer
.value
;
1436 } else if (element
->type
== ACPI_TYPE_INTEGER
) {
1437 wakeup
->gpe_device
= NULL
;
1438 wakeup
->gpe_number
= element
->integer
.value
;
1443 element
= &(package
->package
.elements
[1]);
1444 if (element
->type
!= ACPI_TYPE_INTEGER
)
1447 wakeup
->sleep_state
= element
->integer
.value
;
1449 err
= acpi_extract_power_resources(package
, 2, &wakeup
->resources
);
1453 if (!list_empty(&wakeup
->resources
)) {
1456 err
= acpi_power_wakeup_list_init(&wakeup
->resources
,
1459 acpi_handle_warn(handle
, "Retrieving current states "
1460 "of wakeup power resources failed\n");
1461 acpi_power_resources_list_free(&wakeup
->resources
);
1464 if (sleep_state
< wakeup
->sleep_state
) {
1465 acpi_handle_warn(handle
, "Overriding _PRW sleep state "
1466 "(S%d) by S%d from power resources\n",
1467 (int)wakeup
->sleep_state
, sleep_state
);
1468 wakeup
->sleep_state
= sleep_state
;
1473 kfree(buffer
.pointer
);
1477 static void acpi_wakeup_gpe_init(struct acpi_device
*device
)
1479 struct acpi_device_id button_device_ids
[] = {
1485 struct acpi_device_wakeup
*wakeup
= &device
->wakeup
;
1487 acpi_event_status event_status
;
1489 wakeup
->flags
.notifier_present
= 0;
1491 /* Power button, Lid switch always enable wakeup */
1492 if (!acpi_match_device_ids(device
, button_device_ids
)) {
1493 wakeup
->flags
.run_wake
= 1;
1494 if (!acpi_match_device_ids(device
, &button_device_ids
[1])) {
1495 /* Do not use Lid/sleep button for S5 wakeup */
1496 if (wakeup
->sleep_state
== ACPI_STATE_S5
)
1497 wakeup
->sleep_state
= ACPI_STATE_S4
;
1499 acpi_mark_gpe_for_wake(wakeup
->gpe_device
, wakeup
->gpe_number
);
1500 device_set_wakeup_capable(&device
->dev
, true);
1504 acpi_setup_gpe_for_wake(device
->handle
, wakeup
->gpe_device
,
1505 wakeup
->gpe_number
);
1506 status
= acpi_get_gpe_status(wakeup
->gpe_device
, wakeup
->gpe_number
,
1508 if (ACPI_FAILURE(status
))
1511 wakeup
->flags
.run_wake
= !!(event_status
& ACPI_EVENT_FLAG_HAS_HANDLER
);
1514 static void acpi_bus_get_wakeup_device_flags(struct acpi_device
*device
)
1518 /* Presence of _PRW indicates wake capable */
1519 if (!acpi_has_method(device
->handle
, "_PRW"))
1522 err
= acpi_bus_extract_wakeup_device_power_package(device
->handle
,
1525 dev_err(&device
->dev
, "_PRW evaluation error: %d\n", err
);
1529 device
->wakeup
.flags
.valid
= 1;
1530 device
->wakeup
.prepare_count
= 0;
1531 acpi_wakeup_gpe_init(device
);
1532 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1533 * system for the ACPI device with the _PRW object.
1534 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1535 * So it is necessary to call _DSW object first. Only when it is not
1536 * present will the _PSW object used.
1538 err
= acpi_device_sleep_wake(device
, 0, 0, 0);
1540 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1541 "error in _DSW or _PSW evaluation\n"));
1544 static void acpi_bus_init_power_state(struct acpi_device
*device
, int state
)
1546 struct acpi_device_power_state
*ps
= &device
->power
.states
[state
];
1547 char pathname
[5] = { '_', 'P', 'R', '0' + state
, '\0' };
1548 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1551 INIT_LIST_HEAD(&ps
->resources
);
1553 /* Evaluate "_PRx" to get referenced power resources */
1554 status
= acpi_evaluate_object(device
->handle
, pathname
, NULL
, &buffer
);
1555 if (ACPI_SUCCESS(status
)) {
1556 union acpi_object
*package
= buffer
.pointer
;
1558 if (buffer
.length
&& package
1559 && package
->type
== ACPI_TYPE_PACKAGE
1560 && package
->package
.count
) {
1561 int err
= acpi_extract_power_resources(package
, 0,
1564 device
->power
.flags
.power_resources
= 1;
1566 ACPI_FREE(buffer
.pointer
);
1569 /* Evaluate "_PSx" to see if we can do explicit sets */
1571 if (acpi_has_method(device
->handle
, pathname
))
1572 ps
->flags
.explicit_set
= 1;
1575 * State is valid if there are means to put the device into it.
1576 * D3hot is only valid if _PR3 present.
1578 if (!list_empty(&ps
->resources
)
1579 || (ps
->flags
.explicit_set
&& state
< ACPI_STATE_D3_HOT
)) {
1580 ps
->flags
.valid
= 1;
1581 ps
->flags
.os_accessible
= 1;
1584 ps
->power
= -1; /* Unknown - driver assigned */
1585 ps
->latency
= -1; /* Unknown - driver assigned */
1588 static void acpi_bus_get_power_flags(struct acpi_device
*device
)
1592 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1593 if (!acpi_has_method(device
->handle
, "_PS0") &&
1594 !acpi_has_method(device
->handle
, "_PR0"))
1597 device
->flags
.power_manageable
= 1;
1600 * Power Management Flags
1602 if (acpi_has_method(device
->handle
, "_PSC"))
1603 device
->power
.flags
.explicit_get
= 1;
1605 if (acpi_has_method(device
->handle
, "_IRC"))
1606 device
->power
.flags
.inrush_current
= 1;
1608 if (acpi_has_method(device
->handle
, "_DSW"))
1609 device
->power
.flags
.dsw_present
= 1;
1612 * Enumerate supported power management states
1614 for (i
= ACPI_STATE_D0
; i
<= ACPI_STATE_D3_HOT
; i
++)
1615 acpi_bus_init_power_state(device
, i
);
1617 INIT_LIST_HEAD(&device
->power
.states
[ACPI_STATE_D3_COLD
].resources
);
1619 /* Set defaults for D0 and D3 states (always valid) */
1620 device
->power
.states
[ACPI_STATE_D0
].flags
.valid
= 1;
1621 device
->power
.states
[ACPI_STATE_D0
].power
= 100;
1622 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.valid
= 1;
1623 device
->power
.states
[ACPI_STATE_D3_COLD
].power
= 0;
1625 /* Set D3cold's explicit_set flag if _PS3 exists. */
1626 if (device
->power
.states
[ACPI_STATE_D3_HOT
].flags
.explicit_set
)
1627 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.explicit_set
= 1;
1629 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1630 if (device
->power
.states
[ACPI_STATE_D3_HOT
].flags
.explicit_set
||
1631 device
->power
.flags
.power_resources
)
1632 device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.os_accessible
= 1;
1634 if (acpi_bus_init_power(device
)) {
1635 acpi_free_power_resources_lists(device
);
1636 device
->flags
.power_manageable
= 0;
1640 static void acpi_bus_get_flags(struct acpi_device
*device
)
1642 /* Presence of _STA indicates 'dynamic_status' */
1643 if (acpi_has_method(device
->handle
, "_STA"))
1644 device
->flags
.dynamic_status
= 1;
1646 /* Presence of _RMV indicates 'removable' */
1647 if (acpi_has_method(device
->handle
, "_RMV"))
1648 device
->flags
.removable
= 1;
1650 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1651 if (acpi_has_method(device
->handle
, "_EJD") ||
1652 acpi_has_method(device
->handle
, "_EJ0"))
1653 device
->flags
.ejectable
= 1;
1656 static void acpi_device_get_busid(struct acpi_device
*device
)
1658 char bus_id
[5] = { '?', 0 };
1659 struct acpi_buffer buffer
= { sizeof(bus_id
), bus_id
};
1665 * The device's Bus ID is simply the object name.
1666 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1668 if (ACPI_IS_ROOT_DEVICE(device
)) {
1669 strcpy(device
->pnp
.bus_id
, "ACPI");
1673 switch (device
->device_type
) {
1674 case ACPI_BUS_TYPE_POWER_BUTTON
:
1675 strcpy(device
->pnp
.bus_id
, "PWRF");
1677 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1678 strcpy(device
->pnp
.bus_id
, "SLPF");
1681 acpi_get_name(device
->handle
, ACPI_SINGLE_NAME
, &buffer
);
1682 /* Clean up trailing underscores (if any) */
1683 for (i
= 3; i
> 1; i
--) {
1684 if (bus_id
[i
] == '_')
1689 strcpy(device
->pnp
.bus_id
, bus_id
);
1695 * acpi_ata_match - see if an acpi object is an ATA device
1697 * If an acpi object has one of the ACPI ATA methods defined,
1698 * then we can safely call it an ATA device.
1700 bool acpi_ata_match(acpi_handle handle
)
1702 return acpi_has_method(handle
, "_GTF") ||
1703 acpi_has_method(handle
, "_GTM") ||
1704 acpi_has_method(handle
, "_STM") ||
1705 acpi_has_method(handle
, "_SDD");
1709 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1711 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1712 * then we can safely call it an ejectable drive bay
1714 bool acpi_bay_match(acpi_handle handle
)
1716 acpi_handle phandle
;
1718 if (!acpi_has_method(handle
, "_EJ0"))
1720 if (acpi_ata_match(handle
))
1722 if (ACPI_FAILURE(acpi_get_parent(handle
, &phandle
)))
1725 return acpi_ata_match(phandle
);
1728 bool acpi_device_is_battery(struct acpi_device
*adev
)
1730 struct acpi_hardware_id
*hwid
;
1732 list_for_each_entry(hwid
, &adev
->pnp
.ids
, list
)
1733 if (!strcmp("PNP0C0A", hwid
->id
))
1739 static bool is_ejectable_bay(struct acpi_device
*adev
)
1741 acpi_handle handle
= adev
->handle
;
1743 if (acpi_has_method(handle
, "_EJ0") && acpi_device_is_battery(adev
))
1746 return acpi_bay_match(handle
);
1750 * acpi_dock_match - see if an acpi object has a _DCK method
1752 bool acpi_dock_match(acpi_handle handle
)
1754 return acpi_has_method(handle
, "_DCK");
1757 const char *acpi_device_hid(struct acpi_device
*device
)
1759 struct acpi_hardware_id
*hid
;
1761 if (list_empty(&device
->pnp
.ids
))
1764 hid
= list_first_entry(&device
->pnp
.ids
, struct acpi_hardware_id
, list
);
1767 EXPORT_SYMBOL(acpi_device_hid
);
1769 static void acpi_add_id(struct acpi_device_pnp
*pnp
, const char *dev_id
)
1771 struct acpi_hardware_id
*id
;
1773 id
= kmalloc(sizeof(*id
), GFP_KERNEL
);
1777 id
->id
= kstrdup(dev_id
, GFP_KERNEL
);
1783 list_add_tail(&id
->list
, &pnp
->ids
);
1784 pnp
->type
.hardware_id
= 1;
1788 * Old IBM workstations have a DSDT bug wherein the SMBus object
1789 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1790 * prefix. Work around this.
1792 static bool acpi_ibm_smbus_match(acpi_handle handle
)
1794 char node_name
[ACPI_PATH_SEGMENT_LENGTH
];
1795 struct acpi_buffer path
= { sizeof(node_name
), node_name
};
1797 if (!dmi_name_in_vendors("IBM"))
1800 /* Look for SMBS object */
1801 if (ACPI_FAILURE(acpi_get_name(handle
, ACPI_SINGLE_NAME
, &path
)) ||
1802 strcmp("SMBS", path
.pointer
))
1805 /* Does it have the necessary (but misnamed) methods? */
1806 if (acpi_has_method(handle
, "SBI") &&
1807 acpi_has_method(handle
, "SBR") &&
1808 acpi_has_method(handle
, "SBW"))
1814 static bool acpi_object_is_system_bus(acpi_handle handle
)
1818 if (ACPI_SUCCESS(acpi_get_handle(NULL
, "\\_SB", &tmp
)) &&
1821 if (ACPI_SUCCESS(acpi_get_handle(NULL
, "\\_TZ", &tmp
)) &&
1828 static void acpi_set_pnp_ids(acpi_handle handle
, struct acpi_device_pnp
*pnp
,
1832 struct acpi_device_info
*info
;
1833 struct acpi_pnp_device_id_list
*cid_list
;
1836 switch (device_type
) {
1837 case ACPI_BUS_TYPE_DEVICE
:
1838 if (handle
== ACPI_ROOT_OBJECT
) {
1839 acpi_add_id(pnp
, ACPI_SYSTEM_HID
);
1843 status
= acpi_get_object_info(handle
, &info
);
1844 if (ACPI_FAILURE(status
)) {
1845 pr_err(PREFIX
"%s: Error reading device info\n",
1850 if (info
->valid
& ACPI_VALID_HID
) {
1851 acpi_add_id(pnp
, info
->hardware_id
.string
);
1852 pnp
->type
.platform_id
= 1;
1854 if (info
->valid
& ACPI_VALID_CID
) {
1855 cid_list
= &info
->compatible_id_list
;
1856 for (i
= 0; i
< cid_list
->count
; i
++)
1857 acpi_add_id(pnp
, cid_list
->ids
[i
].string
);
1859 if (info
->valid
& ACPI_VALID_ADR
) {
1860 pnp
->bus_address
= info
->address
;
1861 pnp
->type
.bus_address
= 1;
1863 if (info
->valid
& ACPI_VALID_UID
)
1864 pnp
->unique_id
= kstrdup(info
->unique_id
.string
,
1870 * Some devices don't reliably have _HIDs & _CIDs, so add
1871 * synthetic HIDs to make sure drivers can find them.
1873 if (acpi_is_video_device(handle
))
1874 acpi_add_id(pnp
, ACPI_VIDEO_HID
);
1875 else if (acpi_bay_match(handle
))
1876 acpi_add_id(pnp
, ACPI_BAY_HID
);
1877 else if (acpi_dock_match(handle
))
1878 acpi_add_id(pnp
, ACPI_DOCK_HID
);
1879 else if (acpi_ibm_smbus_match(handle
))
1880 acpi_add_id(pnp
, ACPI_SMBUS_IBM_HID
);
1881 else if (list_empty(&pnp
->ids
) &&
1882 acpi_object_is_system_bus(handle
)) {
1883 /* \_SB, \_TZ, LNXSYBUS */
1884 acpi_add_id(pnp
, ACPI_BUS_HID
);
1885 strcpy(pnp
->device_name
, ACPI_BUS_DEVICE_NAME
);
1886 strcpy(pnp
->device_class
, ACPI_BUS_CLASS
);
1890 case ACPI_BUS_TYPE_POWER
:
1891 acpi_add_id(pnp
, ACPI_POWER_HID
);
1893 case ACPI_BUS_TYPE_PROCESSOR
:
1894 acpi_add_id(pnp
, ACPI_PROCESSOR_OBJECT_HID
);
1896 case ACPI_BUS_TYPE_THERMAL
:
1897 acpi_add_id(pnp
, ACPI_THERMAL_HID
);
1899 case ACPI_BUS_TYPE_POWER_BUTTON
:
1900 acpi_add_id(pnp
, ACPI_BUTTON_HID_POWERF
);
1902 case ACPI_BUS_TYPE_SLEEP_BUTTON
:
1903 acpi_add_id(pnp
, ACPI_BUTTON_HID_SLEEPF
);
1908 void acpi_free_pnp_ids(struct acpi_device_pnp
*pnp
)
1910 struct acpi_hardware_id
*id
, *tmp
;
1912 list_for_each_entry_safe(id
, tmp
, &pnp
->ids
, list
) {
1916 kfree(pnp
->unique_id
);
1919 void acpi_init_device_object(struct acpi_device
*device
, acpi_handle handle
,
1920 int type
, unsigned long long sta
)
1922 INIT_LIST_HEAD(&device
->pnp
.ids
);
1923 device
->device_type
= type
;
1924 device
->handle
= handle
;
1925 device
->parent
= acpi_bus_get_parent(handle
);
1926 acpi_set_device_status(device
, sta
);
1927 acpi_device_get_busid(device
);
1928 acpi_set_pnp_ids(handle
, &device
->pnp
, type
);
1929 acpi_bus_get_flags(device
);
1930 device
->flags
.match_driver
= false;
1931 device
->flags
.initialized
= true;
1932 device
->flags
.visited
= false;
1933 device_initialize(&device
->dev
);
1934 dev_set_uevent_suppress(&device
->dev
, true);
1937 void acpi_device_add_finalize(struct acpi_device
*device
)
1939 dev_set_uevent_suppress(&device
->dev
, false);
1940 kobject_uevent(&device
->dev
.kobj
, KOBJ_ADD
);
1943 static int acpi_add_single_object(struct acpi_device
**child
,
1944 acpi_handle handle
, int type
,
1945 unsigned long long sta
)
1948 struct acpi_device
*device
;
1949 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1951 device
= kzalloc(sizeof(struct acpi_device
), GFP_KERNEL
);
1953 printk(KERN_ERR PREFIX
"Memory allocation error\n");
1957 acpi_init_device_object(device
, handle
, type
, sta
);
1958 acpi_bus_get_power_flags(device
);
1959 acpi_bus_get_wakeup_device_flags(device
);
1961 result
= acpi_device_add(device
, acpi_device_release
);
1963 acpi_device_release(&device
->dev
);
1967 acpi_power_add_remove_device(device
, true);
1968 acpi_device_add_finalize(device
);
1969 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
1970 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Added %s [%s] parent %s\n",
1971 dev_name(&device
->dev
), (char *) buffer
.pointer
,
1972 device
->parent
? dev_name(&device
->parent
->dev
) : "(null)"));
1973 kfree(buffer
.pointer
);
1978 static int acpi_bus_type_and_status(acpi_handle handle
, int *type
,
1979 unsigned long long *sta
)
1982 acpi_object_type acpi_type
;
1984 status
= acpi_get_type(handle
, &acpi_type
);
1985 if (ACPI_FAILURE(status
))
1988 switch (acpi_type
) {
1989 case ACPI_TYPE_ANY
: /* for ACPI_ROOT_OBJECT */
1990 case ACPI_TYPE_DEVICE
:
1991 *type
= ACPI_BUS_TYPE_DEVICE
;
1992 status
= acpi_bus_get_status_handle(handle
, sta
);
1993 if (ACPI_FAILURE(status
))
1996 case ACPI_TYPE_PROCESSOR
:
1997 *type
= ACPI_BUS_TYPE_PROCESSOR
;
1998 status
= acpi_bus_get_status_handle(handle
, sta
);
1999 if (ACPI_FAILURE(status
))
2002 case ACPI_TYPE_THERMAL
:
2003 *type
= ACPI_BUS_TYPE_THERMAL
;
2004 *sta
= ACPI_STA_DEFAULT
;
2006 case ACPI_TYPE_POWER
:
2007 *type
= ACPI_BUS_TYPE_POWER
;
2008 *sta
= ACPI_STA_DEFAULT
;
2017 bool acpi_device_is_present(struct acpi_device
*adev
)
2019 if (adev
->status
.present
|| adev
->status
.functional
)
2022 adev
->flags
.initialized
= false;
2026 static bool acpi_scan_handler_matching(struct acpi_scan_handler
*handler
,
2028 const struct acpi_device_id
**matchid
)
2030 const struct acpi_device_id
*devid
;
2033 return handler
->match(idstr
, matchid
);
2035 for (devid
= handler
->ids
; devid
->id
[0]; devid
++)
2036 if (!strcmp((char *)devid
->id
, idstr
)) {
2046 static struct acpi_scan_handler
*acpi_scan_match_handler(char *idstr
,
2047 const struct acpi_device_id
**matchid
)
2049 struct acpi_scan_handler
*handler
;
2051 list_for_each_entry(handler
, &acpi_scan_handlers_list
, list_node
)
2052 if (acpi_scan_handler_matching(handler
, idstr
, matchid
))
2058 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile
*hotplug
, bool val
)
2060 if (!!hotplug
->enabled
== !!val
)
2063 mutex_lock(&acpi_scan_lock
);
2065 hotplug
->enabled
= val
;
2067 mutex_unlock(&acpi_scan_lock
);
2070 static void acpi_scan_init_hotplug(struct acpi_device
*adev
)
2072 struct acpi_hardware_id
*hwid
;
2074 if (acpi_dock_match(adev
->handle
) || is_ejectable_bay(adev
)) {
2075 acpi_dock_add(adev
);
2078 list_for_each_entry(hwid
, &adev
->pnp
.ids
, list
) {
2079 struct acpi_scan_handler
*handler
;
2081 handler
= acpi_scan_match_handler(hwid
->id
, NULL
);
2083 adev
->flags
.hotplug_notify
= true;
2089 static acpi_status
acpi_bus_check_add(acpi_handle handle
, u32 lvl_not_used
,
2090 void *not_used
, void **return_value
)
2092 struct acpi_device
*device
= NULL
;
2094 unsigned long long sta
;
2097 acpi_bus_get_device(handle
, &device
);
2101 result
= acpi_bus_type_and_status(handle
, &type
, &sta
);
2105 if (type
== ACPI_BUS_TYPE_POWER
) {
2106 acpi_add_power_resource(handle
);
2110 acpi_add_single_object(&device
, handle
, type
, sta
);
2112 return AE_CTRL_DEPTH
;
2114 acpi_scan_init_hotplug(device
);
2118 *return_value
= device
;
2123 static int acpi_check_spi_i2c_slave(struct acpi_resource
*ares
, void *data
)
2125 bool *is_spi_i2c_slave_p
= data
;
2127 if (ares
->type
!= ACPI_RESOURCE_TYPE_SERIAL_BUS
)
2131 * devices that are connected to UART still need to be enumerated to
2134 if (ares
->data
.common_serial_bus
.type
!= ACPI_RESOURCE_SERIAL_TYPE_UART
)
2135 *is_spi_i2c_slave_p
= true;
2137 /* no need to do more checking */
2141 static void acpi_default_enumeration(struct acpi_device
*device
)
2143 struct list_head resource_list
;
2144 bool is_spi_i2c_slave
= false;
2146 if (!device
->pnp
.type
.platform_id
|| device
->handler
)
2150 * Do not enemerate SPI/I2C slaves as they will be enuerated by their
2151 * respective parents.
2153 INIT_LIST_HEAD(&resource_list
);
2154 acpi_dev_get_resources(device
, &resource_list
, acpi_check_spi_i2c_slave
,
2156 acpi_dev_free_resource_list(&resource_list
);
2157 if (!is_spi_i2c_slave
)
2158 acpi_create_platform_device(device
);
2161 static int acpi_scan_attach_handler(struct acpi_device
*device
)
2163 struct acpi_hardware_id
*hwid
;
2166 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
) {
2167 const struct acpi_device_id
*devid
;
2168 struct acpi_scan_handler
*handler
;
2170 handler
= acpi_scan_match_handler(hwid
->id
, &devid
);
2172 if (!handler
->attach
) {
2173 device
->pnp
.type
.platform_id
= 0;
2176 device
->handler
= handler
;
2177 ret
= handler
->attach(device
, devid
);
2181 device
->handler
= NULL
;
2187 acpi_default_enumeration(device
);
2192 static void acpi_bus_attach(struct acpi_device
*device
)
2194 struct acpi_device
*child
;
2198 if (ACPI_SUCCESS(acpi_bus_get_ejd(device
->handle
, &ejd
)))
2199 register_dock_dependent_device(device
, ejd
);
2201 acpi_bus_get_status(device
);
2202 /* Skip devices that are not present. */
2203 if (!acpi_device_is_present(device
)) {
2204 device
->flags
.visited
= false;
2207 if (device
->handler
)
2210 if (!device
->flags
.initialized
) {
2211 acpi_bus_update_power(device
, NULL
);
2212 device
->flags
.initialized
= true;
2214 device
->flags
.visited
= false;
2215 ret
= acpi_scan_attach_handler(device
);
2219 device
->flags
.match_driver
= true;
2221 ret
= device_attach(&device
->dev
);
2225 device
->flags
.visited
= true;
2228 list_for_each_entry(child
, &device
->children
, node
)
2229 acpi_bus_attach(child
);
2231 if (device
->handler
&& device
->handler
->hotplug
.notify_online
)
2232 device
->handler
->hotplug
.notify_online(device
);
2236 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2237 * @handle: Root of the namespace scope to scan.
2239 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2242 * If no devices were found, -ENODEV is returned, but it does not mean that
2243 * there has been a real error. There just have been no suitable ACPI objects
2244 * in the table trunk from which the kernel could create a device and add an
2245 * appropriate driver.
2247 * Must be called under acpi_scan_lock.
2249 int acpi_bus_scan(acpi_handle handle
)
2251 void *device
= NULL
;
2253 if (ACPI_SUCCESS(acpi_bus_check_add(handle
, 0, NULL
, &device
)))
2254 acpi_walk_namespace(ACPI_TYPE_ANY
, handle
, ACPI_UINT32_MAX
,
2255 acpi_bus_check_add
, NULL
, NULL
, &device
);
2258 acpi_bus_attach(device
);
2263 EXPORT_SYMBOL(acpi_bus_scan
);
2266 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2267 * @adev: Root of the ACPI namespace scope to walk.
2269 * Must be called under acpi_scan_lock.
2271 void acpi_bus_trim(struct acpi_device
*adev
)
2273 struct acpi_scan_handler
*handler
= adev
->handler
;
2274 struct acpi_device
*child
;
2276 list_for_each_entry_reverse(child
, &adev
->children
, node
)
2277 acpi_bus_trim(child
);
2279 adev
->flags
.match_driver
= false;
2281 if (handler
->detach
)
2282 handler
->detach(adev
);
2284 adev
->handler
= NULL
;
2286 device_release_driver(&adev
->dev
);
2289 * Most likely, the device is going away, so put it into D3cold before
2292 acpi_device_set_power(adev
, ACPI_STATE_D3_COLD
);
2293 adev
->flags
.initialized
= false;
2294 adev
->flags
.visited
= false;
2296 EXPORT_SYMBOL_GPL(acpi_bus_trim
);
2298 static int acpi_bus_scan_fixed(void)
2303 * Enumerate all fixed-feature devices.
2305 if (!(acpi_gbl_FADT
.flags
& ACPI_FADT_POWER_BUTTON
)) {
2306 struct acpi_device
*device
= NULL
;
2308 result
= acpi_add_single_object(&device
, NULL
,
2309 ACPI_BUS_TYPE_POWER_BUTTON
,
2314 device
->flags
.match_driver
= true;
2315 result
= device_attach(&device
->dev
);
2319 device_init_wakeup(&device
->dev
, true);
2322 if (!(acpi_gbl_FADT
.flags
& ACPI_FADT_SLEEP_BUTTON
)) {
2323 struct acpi_device
*device
= NULL
;
2325 result
= acpi_add_single_object(&device
, NULL
,
2326 ACPI_BUS_TYPE_SLEEP_BUTTON
,
2331 device
->flags
.match_driver
= true;
2332 result
= device_attach(&device
->dev
);
2335 return result
< 0 ? result
: 0;
2338 int __init
acpi_scan_init(void)
2342 result
= bus_register(&acpi_bus_type
);
2344 /* We don't want to quit even if we failed to add suspend/resume */
2345 printk(KERN_ERR PREFIX
"Could not register bus type\n");
2348 acpi_pci_root_init();
2349 acpi_pci_link_init();
2350 acpi_processor_init();
2352 acpi_cmos_rtc_init();
2353 acpi_container_init();
2354 acpi_memory_hotplug_init();
2356 acpi_int340x_thermal_init();
2358 mutex_lock(&acpi_scan_lock
);
2360 * Enumerate devices in the ACPI namespace.
2362 result
= acpi_bus_scan(ACPI_ROOT_OBJECT
);
2366 result
= acpi_bus_get_device(ACPI_ROOT_OBJECT
, &acpi_root
);
2370 /* Fixed feature devices do not exist on HW-reduced platform */
2371 if (!acpi_gbl_reduced_hardware
) {
2372 result
= acpi_bus_scan_fixed();
2374 acpi_detach_data(acpi_root
->handle
,
2375 acpi_scan_drop_device
);
2376 acpi_device_del(acpi_root
);
2377 put_device(&acpi_root
->dev
);
2382 acpi_update_all_gpes();
2385 mutex_unlock(&acpi_scan_lock
);