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 ACPI_DT_NAMESPACE_HID from the modalias below, 0 should
139 * be returned if ACPI_DT_NAMESPACE_HID is the only ACPI/PNP ID in the
143 list_for_each_entry(id, &acpi_dev->pnp.ids, list)
144 if (strcmp(id->id, ACPI_DT_NAMESPACE_HID))
150 len = snprintf(modalias, size, "acpi:");
156 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
157 if (!strcmp(id->id, ACPI_DT_NAMESPACE_HID))
160 count = snprintf(&modalias[len], size, "%s:", id->id);
170 modalias[len] = '\0';
175 * create_of_modalias - Creates DT compatible string for modalias and uevent
176 * @acpi_dev: ACPI device object.
177 * @modalias: Buffer to print into.
178 * @size: Size of the buffer.
180 * Expose DT compatible modalias as of:NnameTCcompatible. This function should
181 * only be called for devices having ACPI_DT_NAMESPACE_HID in their list of
184 static int create_of_modalias(struct acpi_device *acpi_dev, char *modalias,
187 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
188 const union acpi_object *of_compatible, *obj;
193 acpi_get_name(acpi_dev->handle, ACPI_SINGLE_NAME, &buf);
194 /* DT strings are all in lower case */
195 for (c = buf.pointer; *c != '\0'; c++)
198 len = snprintf(modalias, size, "of:N%sT", (char *)buf.pointer);
199 ACPI_FREE(buf.pointer);
204 of_compatible = acpi_dev->data.of_compatible;
205 if (of_compatible->type == ACPI_TYPE_PACKAGE) {
206 nval = of_compatible->package.count;
207 obj = of_compatible->package.elements;
208 } else { /* Must be ACPI_TYPE_STRING. */
212 for (i = 0; i < nval; i++, obj++) {
213 count = snprintf(&modalias[len], size, "C%s",
214 obj->string.pointer);
224 modalias[len] = '\0';
229 * acpi_companion_match() - Can we match via ACPI companion device
230 * @dev: Device in question
232 * Check if the given device has an ACPI companion and if that companion has
233 * a valid list of PNP IDs, and if the device is the first (primary) physical
234 * device associated with it. Return the companion pointer if that's the case
237 * If multiple physical devices are attached to a single ACPI companion, we need
238 * to be careful. The usage scenario for this kind of relationship is that all
239 * of the physical devices in question use resources provided by the ACPI
240 * companion. A typical case is an MFD device where all the sub-devices share
241 * the parent's ACPI companion. In such cases we can only allow the primary
242 * (first) physical device to be matched with the help of the companion's PNP
245 * Additional physical devices sharing the ACPI companion can still use
246 * resources available from it but they will be matched normally using functions
247 * provided by their bus types (and analogously for their modalias).
249 static struct acpi_device *acpi_companion_match(const struct device *dev)
251 struct acpi_device *adev;
252 struct mutex *physical_node_lock;
254 adev = ACPI_COMPANION(dev);
258 if (list_empty(&adev->pnp.ids))
261 physical_node_lock = &adev->physical_node_lock;
262 mutex_lock(physical_node_lock);
263 if (list_empty(&adev->physical_node_list)) {
266 const struct acpi_device_physical_node *node;
268 node = list_first_entry(&adev->physical_node_list,
269 struct acpi_device_physical_node, node);
270 if (node->dev != dev)
273 mutex_unlock(physical_node_lock);
278 static int __acpi_device_uevent_modalias(struct acpi_device *adev,
279 struct kobj_uevent_env *env)
286 if (list_empty(&adev->pnp.ids))
289 if (add_uevent_var(env, "MODALIAS="))
292 len = create_pnp_modalias(adev, &env->buf[env->buflen - 1],
293 sizeof(env->buf) - env->buflen);
298 if (!adev->data.of_compatible)
301 if (len > 0 && add_uevent_var(env, "MODALIAS="))
304 len = create_of_modalias(adev, &env->buf[env->buflen - 1],
305 sizeof(env->buf) - env->buflen);
315 * Creates uevent modalias field for ACPI enumerated devices.
316 * Because the other buses does not support ACPI HIDs & CIDs.
317 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
318 * "acpi:IBM0001:ACPI0001"
320 int acpi_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
322 return __acpi_device_uevent_modalias(acpi_companion_match(dev), env);
324 EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias);
326 static int __acpi_device_modalias(struct acpi_device *adev, char *buf, int size)
333 if (list_empty(&adev->pnp.ids))
336 len = create_pnp_modalias(adev, buf, size - 1);
339 } else if (len > 0) {
343 if (!adev->data.of_compatible)
346 count = create_of_modalias(adev, buf + len, size - 1);
349 } else if (count > 0) {
358 * Creates modalias sysfs attribute for ACPI enumerated devices.
359 * Because the other buses does not support ACPI HIDs & CIDs.
360 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
361 * "acpi:IBM0001:ACPI0001"
363 int acpi_device_modalias(struct device *dev, char *buf, int size)
365 return __acpi_device_modalias(acpi_companion_match(dev), buf, size);
367 EXPORT_SYMBOL_GPL(acpi_device_modalias);
370 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
371 return __acpi_device_modalias(to_acpi_device(dev), buf, 1024);
373 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
375 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
377 struct acpi_device_physical_node *pn;
381 * acpi_container_offline() calls this for all of the container's
382 * children under the container's physical_node_lock lock.
384 mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
386 list_for_each_entry(pn, &adev->physical_node_list, node)
387 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
389 kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
395 mutex_unlock(&adev->physical_node_lock);
399 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
402 struct acpi_device *device = NULL;
403 struct acpi_device_physical_node *pn;
404 bool second_pass = (bool)data;
405 acpi_status status = AE_OK;
407 if (acpi_bus_get_device(handle, &device))
410 if (device->handler && !device->handler->hotplug.enabled) {
411 *ret_p = &device->dev;
415 mutex_lock(&device->physical_node_lock);
417 list_for_each_entry(pn, &device->physical_node_list, node) {
421 /* Skip devices offlined by the first pass. */
425 pn->put_online = false;
427 ret = device_offline(pn->dev);
428 if (acpi_force_hot_remove)
432 pn->put_online = !ret;
442 mutex_unlock(&device->physical_node_lock);
447 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
450 struct acpi_device *device = NULL;
451 struct acpi_device_physical_node *pn;
453 if (acpi_bus_get_device(handle, &device))
456 mutex_lock(&device->physical_node_lock);
458 list_for_each_entry(pn, &device->physical_node_list, node)
459 if (pn->put_online) {
460 device_online(pn->dev);
461 pn->put_online = false;
464 mutex_unlock(&device->physical_node_lock);
469 static int acpi_scan_try_to_offline(struct acpi_device *device)
471 acpi_handle handle = device->handle;
472 struct device *errdev = NULL;
476 * Carry out two passes here and ignore errors in the first pass,
477 * because if the devices in question are memory blocks and
478 * CONFIG_MEMCG is set, one of the blocks may hold data structures
479 * that the other blocks depend on, but it is not known in advance which
482 * If the first pass is successful, the second one isn't needed, though.
484 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
485 NULL, acpi_bus_offline, (void *)false,
487 if (status == AE_SUPPORT) {
488 dev_warn(errdev, "Offline disabled.\n");
489 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
490 acpi_bus_online, NULL, NULL, NULL);
493 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
496 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
497 NULL, acpi_bus_offline, (void *)true,
499 if (!errdev || acpi_force_hot_remove)
500 acpi_bus_offline(handle, 0, (void *)true,
503 if (errdev && !acpi_force_hot_remove) {
504 dev_warn(errdev, "Offline failed.\n");
505 acpi_bus_online(handle, 0, NULL, NULL);
506 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
507 ACPI_UINT32_MAX, acpi_bus_online,
515 static int acpi_scan_hot_remove(struct acpi_device *device)
517 acpi_handle handle = device->handle;
518 unsigned long long sta;
521 if (device->handler && device->handler->hotplug.demand_offline
522 && !acpi_force_hot_remove) {
523 if (!acpi_scan_is_offline(device, true))
526 int error = acpi_scan_try_to_offline(device);
531 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
532 "Hot-removing device %s...\n", dev_name(&device->dev)));
534 acpi_bus_trim(device);
536 acpi_evaluate_lck(handle, 0);
540 status = acpi_evaluate_ej0(handle);
541 if (status == AE_NOT_FOUND)
543 else if (ACPI_FAILURE(status))
547 * Verify if eject was indeed successful. If not, log an error
548 * message. No need to call _OST since _EJ0 call was made OK.
550 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
551 if (ACPI_FAILURE(status)) {
552 acpi_handle_warn(handle,
553 "Status check after eject failed (0x%x)\n", status);
554 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
555 acpi_handle_warn(handle,
556 "Eject incomplete - status 0x%llx\n", sta);
562 static int acpi_scan_device_not_present(struct acpi_device *adev)
564 if (!acpi_device_enumerated(adev)) {
565 dev_warn(&adev->dev, "Still not present\n");
572 static int acpi_scan_device_check(struct acpi_device *adev)
576 acpi_bus_get_status(adev);
577 if (adev->status.present || adev->status.functional) {
579 * This function is only called for device objects for which
580 * matching scan handlers exist. The only situation in which
581 * the scan handler is not attached to this device object yet
582 * is when the device has just appeared (either it wasn't
583 * present at all before or it was removed and then added
587 dev_warn(&adev->dev, "Already enumerated\n");
590 error = acpi_bus_scan(adev->handle);
592 dev_warn(&adev->dev, "Namespace scan failure\n");
595 if (!adev->handler) {
596 dev_warn(&adev->dev, "Enumeration failure\n");
600 error = acpi_scan_device_not_present(adev);
605 static int acpi_scan_bus_check(struct acpi_device *adev)
607 struct acpi_scan_handler *handler = adev->handler;
608 struct acpi_device *child;
611 acpi_bus_get_status(adev);
612 if (!(adev->status.present || adev->status.functional)) {
613 acpi_scan_device_not_present(adev);
616 if (handler && handler->hotplug.scan_dependent)
617 return handler->hotplug.scan_dependent(adev);
619 error = acpi_bus_scan(adev->handle);
621 dev_warn(&adev->dev, "Namespace scan failure\n");
624 list_for_each_entry(child, &adev->children, node) {
625 error = acpi_scan_bus_check(child);
632 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
635 case ACPI_NOTIFY_BUS_CHECK:
636 return acpi_scan_bus_check(adev);
637 case ACPI_NOTIFY_DEVICE_CHECK:
638 return acpi_scan_device_check(adev);
639 case ACPI_NOTIFY_EJECT_REQUEST:
640 case ACPI_OST_EC_OSPM_EJECT:
641 if (adev->handler && !adev->handler->hotplug.enabled) {
642 dev_info(&adev->dev, "Eject disabled\n");
645 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
646 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
647 return acpi_scan_hot_remove(adev);
652 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
654 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
657 lock_device_hotplug();
658 mutex_lock(&acpi_scan_lock);
661 * The device object's ACPI handle cannot become invalid as long as we
662 * are holding acpi_scan_lock, but it might have become invalid before
663 * that lock was acquired.
665 if (adev->handle == INVALID_ACPI_HANDLE)
668 if (adev->flags.is_dock_station) {
669 error = dock_notify(adev, src);
670 } else if (adev->flags.hotplug_notify) {
671 error = acpi_generic_hotplug_event(adev, src);
672 if (error == -EPERM) {
673 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
677 int (*notify)(struct acpi_device *, u32);
679 acpi_lock_hp_context();
680 notify = adev->hp ? adev->hp->notify : NULL;
681 acpi_unlock_hp_context();
683 * There may be additional notify handlers for device objects
684 * without the .event() callback, so ignore them here.
687 error = notify(adev, src);
692 ost_code = ACPI_OST_SC_SUCCESS;
695 acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
698 acpi_bus_put_acpi_device(adev);
699 mutex_unlock(&acpi_scan_lock);
700 unlock_device_hotplug();
703 static ssize_t real_power_state_show(struct device *dev,
704 struct device_attribute *attr, char *buf)
706 struct acpi_device *adev = to_acpi_device(dev);
710 ret = acpi_device_get_power(adev, &state);
714 return sprintf(buf, "%s\n", acpi_power_state_string(state));
717 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
719 static ssize_t power_state_show(struct device *dev,
720 struct device_attribute *attr, char *buf)
722 struct acpi_device *adev = to_acpi_device(dev);
724 return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
727 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
730 acpi_eject_store(struct device *d, struct device_attribute *attr,
731 const char *buf, size_t count)
733 struct acpi_device *acpi_device = to_acpi_device(d);
734 acpi_object_type not_used;
737 if (!count || buf[0] != '1')
740 if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
741 && !acpi_device->driver)
744 status = acpi_get_type(acpi_device->handle, ¬_used);
745 if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
748 get_device(&acpi_device->dev);
749 status = acpi_hotplug_schedule(acpi_device, ACPI_OST_EC_OSPM_EJECT);
750 if (ACPI_SUCCESS(status))
753 put_device(&acpi_device->dev);
754 acpi_evaluate_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
755 ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
756 return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
759 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
762 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
763 struct acpi_device *acpi_dev = to_acpi_device(dev);
765 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
767 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
769 static ssize_t acpi_device_uid_show(struct device *dev,
770 struct device_attribute *attr, char *buf)
772 struct acpi_device *acpi_dev = to_acpi_device(dev);
774 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
776 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
778 static ssize_t acpi_device_adr_show(struct device *dev,
779 struct device_attribute *attr, char *buf)
781 struct acpi_device *acpi_dev = to_acpi_device(dev);
783 return sprintf(buf, "0x%08x\n",
784 (unsigned int)(acpi_dev->pnp.bus_address));
786 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
789 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
790 struct acpi_device *acpi_dev = to_acpi_device(dev);
791 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
794 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
798 result = sprintf(buf, "%s\n", (char*)path.pointer);
803 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
805 /* sysfs file that shows description text from the ACPI _STR method */
806 static ssize_t description_show(struct device *dev,
807 struct device_attribute *attr,
809 struct acpi_device *acpi_dev = to_acpi_device(dev);
812 if (acpi_dev->pnp.str_obj == NULL)
816 * The _STR object contains a Unicode identifier for a device.
817 * We need to convert to utf-8 so it can be displayed.
819 result = utf16s_to_utf8s(
820 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
821 acpi_dev->pnp.str_obj->buffer.length,
822 UTF16_LITTLE_ENDIAN, buf,
825 buf[result++] = '\n';
829 static DEVICE_ATTR(description, 0444, description_show, NULL);
832 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
834 struct acpi_device *acpi_dev = to_acpi_device(dev);
836 unsigned long long sun;
838 status = acpi_evaluate_integer(acpi_dev->handle, "_SUN", NULL, &sun);
839 if (ACPI_FAILURE(status))
842 return sprintf(buf, "%llu\n", sun);
844 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
846 static ssize_t status_show(struct device *dev, struct device_attribute *attr,
848 struct acpi_device *acpi_dev = to_acpi_device(dev);
850 unsigned long long sta;
852 status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta);
853 if (ACPI_FAILURE(status))
856 return sprintf(buf, "%llu\n", sta);
858 static DEVICE_ATTR_RO(status);
860 static int acpi_device_setup_files(struct acpi_device *dev)
862 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
867 * Devices gotten from FADT don't have a "path" attribute
870 result = device_create_file(&dev->dev, &dev_attr_path);
875 if (!list_empty(&dev->pnp.ids)) {
876 result = device_create_file(&dev->dev, &dev_attr_hid);
880 result = device_create_file(&dev->dev, &dev_attr_modalias);
886 * If device has _STR, 'description' file is created
888 if (acpi_has_method(dev->handle, "_STR")) {
889 status = acpi_evaluate_object(dev->handle, "_STR",
891 if (ACPI_FAILURE(status))
892 buffer.pointer = NULL;
893 dev->pnp.str_obj = buffer.pointer;
894 result = device_create_file(&dev->dev, &dev_attr_description);
899 if (dev->pnp.type.bus_address)
900 result = device_create_file(&dev->dev, &dev_attr_adr);
901 if (dev->pnp.unique_id)
902 result = device_create_file(&dev->dev, &dev_attr_uid);
904 if (acpi_has_method(dev->handle, "_SUN")) {
905 result = device_create_file(&dev->dev, &dev_attr_sun);
910 if (acpi_has_method(dev->handle, "_STA")) {
911 result = device_create_file(&dev->dev, &dev_attr_status);
917 * If device has _EJ0, 'eject' file is created that is used to trigger
918 * hot-removal function from userland.
920 if (acpi_has_method(dev->handle, "_EJ0")) {
921 result = device_create_file(&dev->dev, &dev_attr_eject);
926 if (dev->flags.power_manageable) {
927 result = device_create_file(&dev->dev, &dev_attr_power_state);
931 if (dev->power.flags.power_resources)
932 result = device_create_file(&dev->dev,
933 &dev_attr_real_power_state);
940 static void acpi_device_remove_files(struct acpi_device *dev)
942 if (dev->flags.power_manageable) {
943 device_remove_file(&dev->dev, &dev_attr_power_state);
944 if (dev->power.flags.power_resources)
945 device_remove_file(&dev->dev,
946 &dev_attr_real_power_state);
950 * If device has _STR, remove 'description' file
952 if (acpi_has_method(dev->handle, "_STR")) {
953 kfree(dev->pnp.str_obj);
954 device_remove_file(&dev->dev, &dev_attr_description);
957 * If device has _EJ0, remove 'eject' file.
959 if (acpi_has_method(dev->handle, "_EJ0"))
960 device_remove_file(&dev->dev, &dev_attr_eject);
962 if (acpi_has_method(dev->handle, "_SUN"))
963 device_remove_file(&dev->dev, &dev_attr_sun);
965 if (dev->pnp.unique_id)
966 device_remove_file(&dev->dev, &dev_attr_uid);
967 if (dev->pnp.type.bus_address)
968 device_remove_file(&dev->dev, &dev_attr_adr);
969 device_remove_file(&dev->dev, &dev_attr_modalias);
970 device_remove_file(&dev->dev, &dev_attr_hid);
971 if (acpi_has_method(dev->handle, "_STA"))
972 device_remove_file(&dev->dev, &dev_attr_status);
974 device_remove_file(&dev->dev, &dev_attr_path);
976 /* --------------------------------------------------------------------------
978 -------------------------------------------------------------------------- */
981 * acpi_of_match_device - Match device object using the "compatible" property.
982 * @adev: ACPI device object to match.
983 * @of_match_table: List of device IDs to match against.
985 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
986 * identifiers and a _DSD object with the "compatible" property, use that
987 * property to match against the given list of identifiers.
989 static bool acpi_of_match_device(struct acpi_device *adev,
990 const struct of_device_id *of_match_table)
992 const union acpi_object *of_compatible, *obj;
998 of_compatible = adev->data.of_compatible;
999 if (!of_match_table || !of_compatible)
1002 if (of_compatible->type == ACPI_TYPE_PACKAGE) {
1003 nval = of_compatible->package.count;
1004 obj = of_compatible->package.elements;
1005 } else { /* Must be ACPI_TYPE_STRING. */
1007 obj = of_compatible;
1009 /* Now we can look for the driver DT compatible strings */
1010 for (i = 0; i < nval; i++, obj++) {
1011 const struct of_device_id *id;
1013 for (id = of_match_table; id->compatible[0]; id++)
1014 if (!strcasecmp(obj->string.pointer, id->compatible))
1021 static const struct acpi_device_id *__acpi_match_device(
1022 struct acpi_device *device,
1023 const struct acpi_device_id *ids,
1024 const struct of_device_id *of_ids)
1026 const struct acpi_device_id *id;
1027 struct acpi_hardware_id *hwid;
1030 * If the device is not present, it is unnecessary to load device
1033 if (!device || !device->status.present)
1036 list_for_each_entry(hwid, &device->pnp.ids, list) {
1037 /* First, check the ACPI/PNP IDs provided by the caller. */
1038 for (id = ids; id->id[0]; id++)
1039 if (!strcmp((char *) id->id, hwid->id))
1043 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
1044 * "compatible" property if found.
1046 * The id returned by the below is not valid, but the only
1047 * caller passing non-NULL of_ids here is only interested in
1048 * whether or not the return value is NULL.
1050 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)
1051 && acpi_of_match_device(device, of_ids))
1058 * acpi_match_device - Match a struct device against a given list of ACPI IDs
1059 * @ids: Array of struct acpi_device_id object to match against.
1060 * @dev: The device structure to match.
1062 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
1063 * object for that handle and use that object to match against a given list of
1066 * Return a pointer to the first matching ID on success or %NULL on failure.
1068 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
1069 const struct device *dev)
1071 return __acpi_match_device(acpi_companion_match(dev), ids, NULL);
1073 EXPORT_SYMBOL_GPL(acpi_match_device);
1075 int acpi_match_device_ids(struct acpi_device *device,
1076 const struct acpi_device_id *ids)
1078 return __acpi_match_device(device, ids, NULL) ? 0 : -ENOENT;
1080 EXPORT_SYMBOL(acpi_match_device_ids);
1082 bool acpi_driver_match_device(struct device *dev,
1083 const struct device_driver *drv)
1085 if (!drv->acpi_match_table)
1086 return acpi_of_match_device(ACPI_COMPANION(dev),
1087 drv->of_match_table);
1089 return !!__acpi_match_device(acpi_companion_match(dev),
1090 drv->acpi_match_table, drv->of_match_table);
1092 EXPORT_SYMBOL_GPL(acpi_driver_match_device);
1094 static void acpi_free_power_resources_lists(struct acpi_device *device)
1098 if (device->wakeup.flags.valid)
1099 acpi_power_resources_list_free(&device->wakeup.resources);
1101 if (!device->power.flags.power_resources)
1104 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
1105 struct acpi_device_power_state *ps = &device->power.states[i];
1106 acpi_power_resources_list_free(&ps->resources);
1110 static void acpi_device_release(struct device *dev)
1112 struct acpi_device *acpi_dev = to_acpi_device(dev);
1114 acpi_free_properties(acpi_dev);
1115 acpi_free_pnp_ids(&acpi_dev->pnp);
1116 acpi_free_power_resources_lists(acpi_dev);
1120 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
1122 struct acpi_device *acpi_dev = to_acpi_device(dev);
1123 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
1125 return acpi_dev->flags.match_driver
1126 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
1129 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
1131 return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
1134 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
1136 struct acpi_device *device = data;
1138 device->driver->ops.notify(device, event);
1141 static void acpi_device_notify_fixed(void *data)
1143 struct acpi_device *device = data;
1145 /* Fixed hardware devices have no handles */
1146 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
1149 static u32 acpi_device_fixed_event(void *data)
1151 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
1152 return ACPI_INTERRUPT_HANDLED;
1155 static int acpi_device_install_notify_handler(struct acpi_device *device)
1159 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
1161 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
1162 acpi_device_fixed_event,
1164 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
1166 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
1167 acpi_device_fixed_event,
1170 status = acpi_install_notify_handler(device->handle,
1175 if (ACPI_FAILURE(status))
1180 static void acpi_device_remove_notify_handler(struct acpi_device *device)
1182 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
1183 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
1184 acpi_device_fixed_event);
1185 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
1186 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
1187 acpi_device_fixed_event);
1189 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
1190 acpi_device_notify);
1193 static int acpi_device_probe(struct device *dev)
1195 struct acpi_device *acpi_dev = to_acpi_device(dev);
1196 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1199 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
1202 if (!acpi_drv->ops.add)
1205 ret = acpi_drv->ops.add(acpi_dev);
1209 acpi_dev->driver = acpi_drv;
1210 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1211 "Driver [%s] successfully bound to device [%s]\n",
1212 acpi_drv->name, acpi_dev->pnp.bus_id));
1214 if (acpi_drv->ops.notify) {
1215 ret = acpi_device_install_notify_handler(acpi_dev);
1217 if (acpi_drv->ops.remove)
1218 acpi_drv->ops.remove(acpi_dev);
1220 acpi_dev->driver = NULL;
1221 acpi_dev->driver_data = NULL;
1226 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
1227 acpi_drv->name, acpi_dev->pnp.bus_id));
1232 static int acpi_device_remove(struct device * dev)
1234 struct acpi_device *acpi_dev = to_acpi_device(dev);
1235 struct acpi_driver *acpi_drv = acpi_dev->driver;
1238 if (acpi_drv->ops.notify)
1239 acpi_device_remove_notify_handler(acpi_dev);
1240 if (acpi_drv->ops.remove)
1241 acpi_drv->ops.remove(acpi_dev);
1243 acpi_dev->driver = NULL;
1244 acpi_dev->driver_data = NULL;
1250 struct bus_type acpi_bus_type = {
1252 .match = acpi_bus_match,
1253 .probe = acpi_device_probe,
1254 .remove = acpi_device_remove,
1255 .uevent = acpi_device_uevent,
1258 static void acpi_device_del(struct acpi_device *device)
1260 mutex_lock(&acpi_device_lock);
1262 list_del(&device->node);
1264 list_del(&device->wakeup_list);
1265 mutex_unlock(&acpi_device_lock);
1267 acpi_power_add_remove_device(device, false);
1268 acpi_device_remove_files(device);
1270 device->remove(device);
1272 device_del(&device->dev);
1275 static LIST_HEAD(acpi_device_del_list);
1276 static DEFINE_MUTEX(acpi_device_del_lock);
1278 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
1281 struct acpi_device *adev;
1283 mutex_lock(&acpi_device_del_lock);
1285 if (list_empty(&acpi_device_del_list)) {
1286 mutex_unlock(&acpi_device_del_lock);
1289 adev = list_first_entry(&acpi_device_del_list,
1290 struct acpi_device, del_list);
1291 list_del(&adev->del_list);
1293 mutex_unlock(&acpi_device_del_lock);
1295 acpi_device_del(adev);
1297 * Drop references to all power resources that might have been
1298 * used by the device.
1300 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
1301 put_device(&adev->dev);
1306 * acpi_scan_drop_device - Drop an ACPI device object.
1307 * @handle: Handle of an ACPI namespace node, not used.
1308 * @context: Address of the ACPI device object to drop.
1310 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
1311 * namespace node the device object pointed to by @context is attached to.
1313 * The unregistration is carried out asynchronously to avoid running
1314 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
1315 * ensure the correct ordering (the device objects must be unregistered in the
1316 * same order in which the corresponding namespace nodes are deleted).
1318 static void acpi_scan_drop_device(acpi_handle handle, void *context)
1320 static DECLARE_WORK(work, acpi_device_del_work_fn);
1321 struct acpi_device *adev = context;
1323 mutex_lock(&acpi_device_del_lock);
1326 * Use the ACPI hotplug workqueue which is ordered, so this work item
1327 * won't run after any hotplug work items submitted subsequently. That
1328 * prevents attempts to register device objects identical to those being
1329 * deleted from happening concurrently (such attempts result from
1330 * hotplug events handled via the ACPI hotplug workqueue). It also will
1331 * run after all of the work items submitted previosuly, which helps
1332 * those work items to ensure that they are not accessing stale device
1335 if (list_empty(&acpi_device_del_list))
1336 acpi_queue_hotplug_work(&work);
1338 list_add_tail(&adev->del_list, &acpi_device_del_list);
1339 /* Make acpi_ns_validate_handle() return NULL for this handle. */
1340 adev->handle = INVALID_ACPI_HANDLE;
1342 mutex_unlock(&acpi_device_del_lock);
1345 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
1346 void (*callback)(void *))
1353 status = acpi_get_data_full(handle, acpi_scan_drop_device,
1354 (void **)device, callback);
1355 if (ACPI_FAILURE(status) || !*device) {
1356 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
1363 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
1365 return acpi_get_device_data(handle, device, NULL);
1367 EXPORT_SYMBOL(acpi_bus_get_device);
1369 static void get_acpi_device(void *dev)
1372 get_device(&((struct acpi_device *)dev)->dev);
1375 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
1377 struct acpi_device *adev = NULL;
1379 acpi_get_device_data(handle, &adev, get_acpi_device);
1383 void acpi_bus_put_acpi_device(struct acpi_device *adev)
1385 put_device(&adev->dev);
1388 int acpi_device_add(struct acpi_device *device,
1389 void (*release)(struct device *))
1392 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
1395 if (device->handle) {
1398 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
1400 if (ACPI_FAILURE(status)) {
1401 acpi_handle_err(device->handle,
1402 "Unable to attach device data\n");
1410 * Link this device to its parent and siblings.
1412 INIT_LIST_HEAD(&device->children);
1413 INIT_LIST_HEAD(&device->node);
1414 INIT_LIST_HEAD(&device->wakeup_list);
1415 INIT_LIST_HEAD(&device->physical_node_list);
1416 INIT_LIST_HEAD(&device->del_list);
1417 mutex_init(&device->physical_node_lock);
1419 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
1421 pr_err(PREFIX "Memory allocation error\n");
1426 mutex_lock(&acpi_device_lock);
1428 * Find suitable bus_id and instance number in acpi_bus_id_list
1429 * If failed, create one and link it into acpi_bus_id_list
1431 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1432 if (!strcmp(acpi_device_bus_id->bus_id,
1433 acpi_device_hid(device))) {
1434 acpi_device_bus_id->instance_no++;
1441 acpi_device_bus_id = new_bus_id;
1442 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1443 acpi_device_bus_id->instance_no = 0;
1444 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1446 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1449 list_add_tail(&device->node, &device->parent->children);
1451 if (device->wakeup.flags.valid)
1452 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1453 mutex_unlock(&acpi_device_lock);
1456 device->dev.parent = &device->parent->dev;
1457 device->dev.bus = &acpi_bus_type;
1458 device->dev.release = release;
1459 result = device_add(&device->dev);
1461 dev_err(&device->dev, "Error registering device\n");
1465 result = acpi_device_setup_files(device);
1467 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1468 dev_name(&device->dev));
1473 mutex_lock(&acpi_device_lock);
1475 list_del(&device->node);
1476 list_del(&device->wakeup_list);
1477 mutex_unlock(&acpi_device_lock);
1480 acpi_detach_data(device->handle, acpi_scan_drop_device);
1484 struct acpi_device *acpi_get_next_child(struct device *dev,
1485 struct acpi_device *child)
1487 struct acpi_device *adev = ACPI_COMPANION(dev);
1488 struct list_head *head, *next;
1493 head = &adev->children;
1494 if (list_empty(head))
1498 return list_first_entry(head, struct acpi_device, node);
1500 next = child->node.next;
1501 return next == head ? NULL : list_entry(next, struct acpi_device, node);
1504 /* --------------------------------------------------------------------------
1506 -------------------------------------------------------------------------- */
1508 * acpi_bus_register_driver - register a driver with the ACPI bus
1509 * @driver: driver being registered
1511 * Registers a driver with the ACPI bus. Searches the namespace for all
1512 * devices that match the driver's criteria and binds. Returns zero for
1513 * success or a negative error status for failure.
1515 int acpi_bus_register_driver(struct acpi_driver *driver)
1521 driver->drv.name = driver->name;
1522 driver->drv.bus = &acpi_bus_type;
1523 driver->drv.owner = driver->owner;
1525 ret = driver_register(&driver->drv);
1529 EXPORT_SYMBOL(acpi_bus_register_driver);
1532 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1533 * @driver: driver to unregister
1535 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1536 * devices that match the driver's criteria and unbinds.
1538 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1540 driver_unregister(&driver->drv);
1543 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1545 /* --------------------------------------------------------------------------
1547 -------------------------------------------------------------------------- */
1548 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1550 struct acpi_device *device = NULL;
1554 * Fixed hardware devices do not appear in the namespace and do not
1555 * have handles, but we fabricate acpi_devices for them, so we have
1556 * to deal with them specially.
1562 status = acpi_get_parent(handle, &handle);
1563 if (ACPI_FAILURE(status))
1564 return status == AE_NULL_ENTRY ? NULL : acpi_root;
1565 } while (acpi_bus_get_device(handle, &device));
1570 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1574 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1575 union acpi_object *obj;
1577 status = acpi_get_handle(handle, "_EJD", &tmp);
1578 if (ACPI_FAILURE(status))
1581 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1582 if (ACPI_SUCCESS(status)) {
1583 obj = buffer.pointer;
1584 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1586 kfree(buffer.pointer);
1590 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1592 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1593 struct acpi_device_wakeup *wakeup)
1595 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1596 union acpi_object *package = NULL;
1597 union acpi_object *element = NULL;
1604 INIT_LIST_HEAD(&wakeup->resources);
1607 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1608 if (ACPI_FAILURE(status)) {
1609 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1613 package = (union acpi_object *)buffer.pointer;
1615 if (!package || package->package.count < 2)
1618 element = &(package->package.elements[0]);
1622 if (element->type == ACPI_TYPE_PACKAGE) {
1623 if ((element->package.count < 2) ||
1624 (element->package.elements[0].type !=
1625 ACPI_TYPE_LOCAL_REFERENCE)
1626 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1629 wakeup->gpe_device =
1630 element->package.elements[0].reference.handle;
1631 wakeup->gpe_number =
1632 (u32) element->package.elements[1].integer.value;
1633 } else if (element->type == ACPI_TYPE_INTEGER) {
1634 wakeup->gpe_device = NULL;
1635 wakeup->gpe_number = element->integer.value;
1640 element = &(package->package.elements[1]);
1641 if (element->type != ACPI_TYPE_INTEGER)
1644 wakeup->sleep_state = element->integer.value;
1646 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1650 if (!list_empty(&wakeup->resources)) {
1653 err = acpi_power_wakeup_list_init(&wakeup->resources,
1656 acpi_handle_warn(handle, "Retrieving current states "
1657 "of wakeup power resources failed\n");
1658 acpi_power_resources_list_free(&wakeup->resources);
1661 if (sleep_state < wakeup->sleep_state) {
1662 acpi_handle_warn(handle, "Overriding _PRW sleep state "
1663 "(S%d) by S%d from power resources\n",
1664 (int)wakeup->sleep_state, sleep_state);
1665 wakeup->sleep_state = sleep_state;
1670 kfree(buffer.pointer);
1674 static void acpi_wakeup_gpe_init(struct acpi_device *device)
1676 static const struct acpi_device_id button_device_ids[] = {
1682 struct acpi_device_wakeup *wakeup = &device->wakeup;
1684 acpi_event_status event_status;
1686 wakeup->flags.notifier_present = 0;
1688 /* Power button, Lid switch always enable wakeup */
1689 if (!acpi_match_device_ids(device, button_device_ids)) {
1690 wakeup->flags.run_wake = 1;
1691 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1692 /* Do not use Lid/sleep button for S5 wakeup */
1693 if (wakeup->sleep_state == ACPI_STATE_S5)
1694 wakeup->sleep_state = ACPI_STATE_S4;
1696 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
1697 device_set_wakeup_capable(&device->dev, true);
1701 acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
1702 wakeup->gpe_number);
1703 status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number,
1705 if (ACPI_FAILURE(status))
1708 wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HAS_HANDLER);
1711 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1715 /* Presence of _PRW indicates wake capable */
1716 if (!acpi_has_method(device->handle, "_PRW"))
1719 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1722 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1726 device->wakeup.flags.valid = 1;
1727 device->wakeup.prepare_count = 0;
1728 acpi_wakeup_gpe_init(device);
1729 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1730 * system for the ACPI device with the _PRW object.
1731 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1732 * So it is necessary to call _DSW object first. Only when it is not
1733 * present will the _PSW object used.
1735 err = acpi_device_sleep_wake(device, 0, 0, 0);
1737 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1738 "error in _DSW or _PSW evaluation\n"));
1741 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1743 struct acpi_device_power_state *ps = &device->power.states[state];
1744 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1745 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1748 INIT_LIST_HEAD(&ps->resources);
1750 /* Evaluate "_PRx" to get referenced power resources */
1751 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1752 if (ACPI_SUCCESS(status)) {
1753 union acpi_object *package = buffer.pointer;
1755 if (buffer.length && package
1756 && package->type == ACPI_TYPE_PACKAGE
1757 && package->package.count) {
1758 int err = acpi_extract_power_resources(package, 0,
1761 device->power.flags.power_resources = 1;
1763 ACPI_FREE(buffer.pointer);
1766 /* Evaluate "_PSx" to see if we can do explicit sets */
1768 if (acpi_has_method(device->handle, pathname))
1769 ps->flags.explicit_set = 1;
1772 * State is valid if there are means to put the device into it.
1773 * D3hot is only valid if _PR3 present.
1775 if (!list_empty(&ps->resources)
1776 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1777 ps->flags.valid = 1;
1778 ps->flags.os_accessible = 1;
1781 ps->power = -1; /* Unknown - driver assigned */
1782 ps->latency = -1; /* Unknown - driver assigned */
1785 static void acpi_bus_get_power_flags(struct acpi_device *device)
1789 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1790 if (!acpi_has_method(device->handle, "_PS0") &&
1791 !acpi_has_method(device->handle, "_PR0"))
1794 device->flags.power_manageable = 1;
1797 * Power Management Flags
1799 if (acpi_has_method(device->handle, "_PSC"))
1800 device->power.flags.explicit_get = 1;
1802 if (acpi_has_method(device->handle, "_IRC"))
1803 device->power.flags.inrush_current = 1;
1805 if (acpi_has_method(device->handle, "_DSW"))
1806 device->power.flags.dsw_present = 1;
1809 * Enumerate supported power management states
1811 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1812 acpi_bus_init_power_state(device, i);
1814 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1816 /* Set defaults for D0 and D3 states (always valid) */
1817 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1818 device->power.states[ACPI_STATE_D0].power = 100;
1819 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1820 device->power.states[ACPI_STATE_D3_COLD].power = 0;
1822 /* Set D3cold's explicit_set flag if _PS3 exists. */
1823 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1824 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1826 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1827 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1828 device->power.flags.power_resources)
1829 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1831 if (acpi_bus_init_power(device))
1832 device->flags.power_manageable = 0;
1835 static void acpi_bus_get_flags(struct acpi_device *device)
1837 /* Presence of _STA indicates 'dynamic_status' */
1838 if (acpi_has_method(device->handle, "_STA"))
1839 device->flags.dynamic_status = 1;
1841 /* Presence of _RMV indicates 'removable' */
1842 if (acpi_has_method(device->handle, "_RMV"))
1843 device->flags.removable = 1;
1845 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1846 if (acpi_has_method(device->handle, "_EJD") ||
1847 acpi_has_method(device->handle, "_EJ0"))
1848 device->flags.ejectable = 1;
1851 static void acpi_device_get_busid(struct acpi_device *device)
1853 char bus_id[5] = { '?', 0 };
1854 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1860 * The device's Bus ID is simply the object name.
1861 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1863 if (ACPI_IS_ROOT_DEVICE(device)) {
1864 strcpy(device->pnp.bus_id, "ACPI");
1868 switch (device->device_type) {
1869 case ACPI_BUS_TYPE_POWER_BUTTON:
1870 strcpy(device->pnp.bus_id, "PWRF");
1872 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1873 strcpy(device->pnp.bus_id, "SLPF");
1876 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1877 /* Clean up trailing underscores (if any) */
1878 for (i = 3; i > 1; i--) {
1879 if (bus_id[i] == '_')
1884 strcpy(device->pnp.bus_id, bus_id);
1890 * acpi_ata_match - see if an acpi object is an ATA device
1892 * If an acpi object has one of the ACPI ATA methods defined,
1893 * then we can safely call it an ATA device.
1895 bool acpi_ata_match(acpi_handle handle)
1897 return acpi_has_method(handle, "_GTF") ||
1898 acpi_has_method(handle, "_GTM") ||
1899 acpi_has_method(handle, "_STM") ||
1900 acpi_has_method(handle, "_SDD");
1904 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1906 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1907 * then we can safely call it an ejectable drive bay
1909 bool acpi_bay_match(acpi_handle handle)
1911 acpi_handle phandle;
1913 if (!acpi_has_method(handle, "_EJ0"))
1915 if (acpi_ata_match(handle))
1917 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1920 return acpi_ata_match(phandle);
1923 bool acpi_device_is_battery(struct acpi_device *adev)
1925 struct acpi_hardware_id *hwid;
1927 list_for_each_entry(hwid, &adev->pnp.ids, list)
1928 if (!strcmp("PNP0C0A", hwid->id))
1934 static bool is_ejectable_bay(struct acpi_device *adev)
1936 acpi_handle handle = adev->handle;
1938 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1941 return acpi_bay_match(handle);
1945 * acpi_dock_match - see if an acpi object has a _DCK method
1947 bool acpi_dock_match(acpi_handle handle)
1949 return acpi_has_method(handle, "_DCK");
1952 const char *acpi_device_hid(struct acpi_device *device)
1954 struct acpi_hardware_id *hid;
1956 if (list_empty(&device->pnp.ids))
1959 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1962 EXPORT_SYMBOL(acpi_device_hid);
1964 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1966 struct acpi_hardware_id *id;
1968 id = kmalloc(sizeof(*id), GFP_KERNEL);
1972 id->id = kstrdup(dev_id, GFP_KERNEL);
1978 list_add_tail(&id->list, &pnp->ids);
1979 pnp->type.hardware_id = 1;
1983 * Old IBM workstations have a DSDT bug wherein the SMBus object
1984 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1985 * prefix. Work around this.
1987 static bool acpi_ibm_smbus_match(acpi_handle handle)
1989 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1990 struct acpi_buffer path = { sizeof(node_name), node_name };
1992 if (!dmi_name_in_vendors("IBM"))
1995 /* Look for SMBS object */
1996 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1997 strcmp("SMBS", path.pointer))
2000 /* Does it have the necessary (but misnamed) methods? */
2001 if (acpi_has_method(handle, "SBI") &&
2002 acpi_has_method(handle, "SBR") &&
2003 acpi_has_method(handle, "SBW"))
2009 static bool acpi_object_is_system_bus(acpi_handle handle)
2013 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
2016 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
2023 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
2027 struct acpi_device_info *info;
2028 struct acpi_pnp_device_id_list *cid_list;
2031 switch (device_type) {
2032 case ACPI_BUS_TYPE_DEVICE:
2033 if (handle == ACPI_ROOT_OBJECT) {
2034 acpi_add_id(pnp, ACPI_SYSTEM_HID);
2038 status = acpi_get_object_info(handle, &info);
2039 if (ACPI_FAILURE(status)) {
2040 pr_err(PREFIX "%s: Error reading device info\n",
2045 if (info->valid & ACPI_VALID_HID) {
2046 acpi_add_id(pnp, info->hardware_id.string);
2047 pnp->type.platform_id = 1;
2049 if (info->valid & ACPI_VALID_CID) {
2050 cid_list = &info->compatible_id_list;
2051 for (i = 0; i < cid_list->count; i++)
2052 acpi_add_id(pnp, cid_list->ids[i].string);
2054 if (info->valid & ACPI_VALID_ADR) {
2055 pnp->bus_address = info->address;
2056 pnp->type.bus_address = 1;
2058 if (info->valid & ACPI_VALID_UID)
2059 pnp->unique_id = kstrdup(info->unique_id.string,
2065 * Some devices don't reliably have _HIDs & _CIDs, so add
2066 * synthetic HIDs to make sure drivers can find them.
2068 if (acpi_is_video_device(handle))
2069 acpi_add_id(pnp, ACPI_VIDEO_HID);
2070 else if (acpi_bay_match(handle))
2071 acpi_add_id(pnp, ACPI_BAY_HID);
2072 else if (acpi_dock_match(handle))
2073 acpi_add_id(pnp, ACPI_DOCK_HID);
2074 else if (acpi_ibm_smbus_match(handle))
2075 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
2076 else if (list_empty(&pnp->ids) &&
2077 acpi_object_is_system_bus(handle)) {
2078 /* \_SB, \_TZ, LNXSYBUS */
2079 acpi_add_id(pnp, ACPI_BUS_HID);
2080 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
2081 strcpy(pnp->device_class, ACPI_BUS_CLASS);
2085 case ACPI_BUS_TYPE_POWER:
2086 acpi_add_id(pnp, ACPI_POWER_HID);
2088 case ACPI_BUS_TYPE_PROCESSOR:
2089 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
2091 case ACPI_BUS_TYPE_THERMAL:
2092 acpi_add_id(pnp, ACPI_THERMAL_HID);
2094 case ACPI_BUS_TYPE_POWER_BUTTON:
2095 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
2097 case ACPI_BUS_TYPE_SLEEP_BUTTON:
2098 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
2103 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
2105 struct acpi_hardware_id *id, *tmp;
2107 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
2111 kfree(pnp->unique_id);
2114 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
2115 int type, unsigned long long sta)
2117 INIT_LIST_HEAD(&device->pnp.ids);
2118 device->device_type = type;
2119 device->handle = handle;
2120 device->parent = acpi_bus_get_parent(handle);
2121 device->fwnode.type = FWNODE_ACPI;
2122 acpi_set_device_status(device, sta);
2123 acpi_device_get_busid(device);
2124 acpi_set_pnp_ids(handle, &device->pnp, type);
2125 acpi_init_properties(device);
2126 acpi_bus_get_flags(device);
2127 device->flags.match_driver = false;
2128 device->flags.initialized = true;
2129 device->flags.visited = false;
2130 device_initialize(&device->dev);
2131 dev_set_uevent_suppress(&device->dev, true);
2134 void acpi_device_add_finalize(struct acpi_device *device)
2136 dev_set_uevent_suppress(&device->dev, false);
2137 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
2140 static int acpi_add_single_object(struct acpi_device **child,
2141 acpi_handle handle, int type,
2142 unsigned long long sta)
2145 struct acpi_device *device;
2146 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
2148 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
2150 printk(KERN_ERR PREFIX "Memory allocation error\n");
2154 acpi_init_device_object(device, handle, type, sta);
2155 acpi_bus_get_power_flags(device);
2156 acpi_bus_get_wakeup_device_flags(device);
2158 result = acpi_device_add(device, acpi_device_release);
2160 acpi_device_release(&device->dev);
2164 acpi_power_add_remove_device(device, true);
2165 acpi_device_add_finalize(device);
2166 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
2167 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
2168 dev_name(&device->dev), (char *) buffer.pointer,
2169 device->parent ? dev_name(&device->parent->dev) : "(null)"));
2170 kfree(buffer.pointer);
2175 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
2176 unsigned long long *sta)
2179 acpi_object_type acpi_type;
2181 status = acpi_get_type(handle, &acpi_type);
2182 if (ACPI_FAILURE(status))
2185 switch (acpi_type) {
2186 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
2187 case ACPI_TYPE_DEVICE:
2188 *type = ACPI_BUS_TYPE_DEVICE;
2189 status = acpi_bus_get_status_handle(handle, sta);
2190 if (ACPI_FAILURE(status))
2193 case ACPI_TYPE_PROCESSOR:
2194 *type = ACPI_BUS_TYPE_PROCESSOR;
2195 status = acpi_bus_get_status_handle(handle, sta);
2196 if (ACPI_FAILURE(status))
2199 case ACPI_TYPE_THERMAL:
2200 *type = ACPI_BUS_TYPE_THERMAL;
2201 *sta = ACPI_STA_DEFAULT;
2203 case ACPI_TYPE_POWER:
2204 *type = ACPI_BUS_TYPE_POWER;
2205 *sta = ACPI_STA_DEFAULT;
2214 bool acpi_device_is_present(struct acpi_device *adev)
2216 if (adev->status.present || adev->status.functional)
2219 adev->flags.initialized = false;
2223 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
2225 const struct acpi_device_id **matchid)
2227 const struct acpi_device_id *devid;
2230 return handler->match(idstr, matchid);
2232 for (devid = handler->ids; devid->id[0]; devid++)
2233 if (!strcmp((char *)devid->id, idstr)) {
2243 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
2244 const struct acpi_device_id **matchid)
2246 struct acpi_scan_handler *handler;
2248 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
2249 if (acpi_scan_handler_matching(handler, idstr, matchid))
2255 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
2257 if (!!hotplug->enabled == !!val)
2260 mutex_lock(&acpi_scan_lock);
2262 hotplug->enabled = val;
2264 mutex_unlock(&acpi_scan_lock);
2267 static void acpi_scan_init_hotplug(struct acpi_device *adev)
2269 struct acpi_hardware_id *hwid;
2271 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
2272 acpi_dock_add(adev);
2275 list_for_each_entry(hwid, &adev->pnp.ids, list) {
2276 struct acpi_scan_handler *handler;
2278 handler = acpi_scan_match_handler(hwid->id, NULL);
2280 adev->flags.hotplug_notify = true;
2286 static void acpi_device_dep_initialize(struct acpi_device *adev)
2288 struct acpi_dep_data *dep;
2289 struct acpi_handle_list dep_devices;
2293 if (!acpi_has_method(adev->handle, "_DEP"))
2296 status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
2298 if (ACPI_FAILURE(status)) {
2299 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
2303 for (i = 0; i < dep_devices.count; i++) {
2304 struct acpi_device_info *info;
2307 status = acpi_get_object_info(dep_devices.handles[i], &info);
2308 if (ACPI_FAILURE(status)) {
2309 dev_dbg(&adev->dev, "Error reading _DEP device info\n");
2314 * Skip the dependency of Windows System Power
2315 * Management Controller
2317 skip = info->valid & ACPI_VALID_HID &&
2318 !strcmp(info->hardware_id.string, "INT3396");
2325 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
2329 dep->master = dep_devices.handles[i];
2330 dep->slave = adev->handle;
2333 mutex_lock(&acpi_dep_list_lock);
2334 list_add_tail(&dep->node , &acpi_dep_list);
2335 mutex_unlock(&acpi_dep_list_lock);
2339 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
2340 void *not_used, void **return_value)
2342 struct acpi_device *device = NULL;
2344 unsigned long long sta;
2347 acpi_bus_get_device(handle, &device);
2351 result = acpi_bus_type_and_status(handle, &type, &sta);
2355 if (type == ACPI_BUS_TYPE_POWER) {
2356 acpi_add_power_resource(handle);
2360 acpi_add_single_object(&device, handle, type, sta);
2362 return AE_CTRL_DEPTH;
2364 acpi_scan_init_hotplug(device);
2365 acpi_device_dep_initialize(device);
2369 *return_value = device;
2374 static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
2376 bool *is_spi_i2c_slave_p = data;
2378 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
2382 * devices that are connected to UART still need to be enumerated to
2385 if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
2386 *is_spi_i2c_slave_p = true;
2388 /* no need to do more checking */
2392 static void acpi_default_enumeration(struct acpi_device *device)
2394 struct list_head resource_list;
2395 bool is_spi_i2c_slave = false;
2398 * Do not enemerate SPI/I2C slaves as they will be enuerated by their
2399 * respective parents.
2401 INIT_LIST_HEAD(&resource_list);
2402 acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
2404 acpi_dev_free_resource_list(&resource_list);
2405 if (!is_spi_i2c_slave)
2406 acpi_create_platform_device(device);
2409 static const struct acpi_device_id generic_device_ids[] = {
2410 {ACPI_DT_NAMESPACE_HID, },
2414 static int acpi_generic_device_attach(struct acpi_device *adev,
2415 const struct acpi_device_id *not_used)
2418 * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
2419 * below can be unconditional.
2421 if (adev->data.of_compatible)
2422 acpi_default_enumeration(adev);
2427 static struct acpi_scan_handler generic_device_handler = {
2428 .ids = generic_device_ids,
2429 .attach = acpi_generic_device_attach,
2432 static int acpi_scan_attach_handler(struct acpi_device *device)
2434 struct acpi_hardware_id *hwid;
2437 list_for_each_entry(hwid, &device->pnp.ids, list) {
2438 const struct acpi_device_id *devid;
2439 struct acpi_scan_handler *handler;
2441 handler = acpi_scan_match_handler(hwid->id, &devid);
2443 if (!handler->attach) {
2444 device->pnp.type.platform_id = 0;
2447 device->handler = handler;
2448 ret = handler->attach(device, devid);
2452 device->handler = NULL;
2461 static void acpi_bus_attach(struct acpi_device *device)
2463 struct acpi_device *child;
2467 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2468 register_dock_dependent_device(device, ejd);
2470 acpi_bus_get_status(device);
2471 /* Skip devices that are not present. */
2472 if (!acpi_device_is_present(device)) {
2473 device->flags.visited = false;
2474 device->flags.power_manageable = 0;
2477 if (device->handler)
2480 if (!device->flags.initialized) {
2481 device->flags.power_manageable =
2482 device->power.states[ACPI_STATE_D0].flags.valid;
2483 if (acpi_bus_init_power(device))
2484 device->flags.power_manageable = 0;
2486 device->flags.initialized = true;
2488 device->flags.visited = false;
2489 ret = acpi_scan_attach_handler(device);
2493 device->flags.match_driver = true;
2495 ret = device_attach(&device->dev);
2499 if (!ret && device->pnp.type.platform_id)
2500 acpi_default_enumeration(device);
2502 device->flags.visited = true;
2505 list_for_each_entry(child, &device->children, node)
2506 acpi_bus_attach(child);
2508 if (device->handler && device->handler->hotplug.notify_online)
2509 device->handler->hotplug.notify_online(device);
2512 void acpi_walk_dep_device_list(acpi_handle handle)
2514 struct acpi_dep_data *dep, *tmp;
2515 struct acpi_device *adev;
2517 mutex_lock(&acpi_dep_list_lock);
2518 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2519 if (dep->master == handle) {
2520 acpi_bus_get_device(dep->slave, &adev);
2525 if (!adev->dep_unmet)
2526 acpi_bus_attach(adev);
2527 list_del(&dep->node);
2531 mutex_unlock(&acpi_dep_list_lock);
2533 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
2536 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2537 * @handle: Root of the namespace scope to scan.
2539 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2542 * If no devices were found, -ENODEV is returned, but it does not mean that
2543 * there has been a real error. There just have been no suitable ACPI objects
2544 * in the table trunk from which the kernel could create a device and add an
2545 * appropriate driver.
2547 * Must be called under acpi_scan_lock.
2549 int acpi_bus_scan(acpi_handle handle)
2551 void *device = NULL;
2553 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2554 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2555 acpi_bus_check_add, NULL, NULL, &device);
2558 acpi_bus_attach(device);
2563 EXPORT_SYMBOL(acpi_bus_scan);
2566 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2567 * @adev: Root of the ACPI namespace scope to walk.
2569 * Must be called under acpi_scan_lock.
2571 void acpi_bus_trim(struct acpi_device *adev)
2573 struct acpi_scan_handler *handler = adev->handler;
2574 struct acpi_device *child;
2576 list_for_each_entry_reverse(child, &adev->children, node)
2577 acpi_bus_trim(child);
2579 adev->flags.match_driver = false;
2581 if (handler->detach)
2582 handler->detach(adev);
2584 adev->handler = NULL;
2586 device_release_driver(&adev->dev);
2589 * Most likely, the device is going away, so put it into D3cold before
2592 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2593 adev->flags.initialized = false;
2594 adev->flags.visited = false;
2596 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2598 static int acpi_bus_scan_fixed(void)
2603 * Enumerate all fixed-feature devices.
2605 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2606 struct acpi_device *device = NULL;
2608 result = acpi_add_single_object(&device, NULL,
2609 ACPI_BUS_TYPE_POWER_BUTTON,
2614 device->flags.match_driver = true;
2615 result = device_attach(&device->dev);
2619 device_init_wakeup(&device->dev, true);
2622 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2623 struct acpi_device *device = NULL;
2625 result = acpi_add_single_object(&device, NULL,
2626 ACPI_BUS_TYPE_SLEEP_BUTTON,
2631 device->flags.match_driver = true;
2632 result = device_attach(&device->dev);
2635 return result < 0 ? result : 0;
2638 int __init acpi_scan_init(void)
2642 result = bus_register(&acpi_bus_type);
2644 /* We don't want to quit even if we failed to add suspend/resume */
2645 printk(KERN_ERR PREFIX "Could not register bus type\n");
2648 acpi_pci_root_init();
2649 acpi_pci_link_init();
2650 acpi_processor_init();
2653 acpi_cmos_rtc_init();
2654 acpi_container_init();
2655 acpi_memory_hotplug_init();
2657 acpi_int340x_thermal_init();
2659 acpi_scan_add_handler(&generic_device_handler);
2661 mutex_lock(&acpi_scan_lock);
2663 * Enumerate devices in the ACPI namespace.
2665 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2669 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2673 /* Fixed feature devices do not exist on HW-reduced platform */
2674 if (!acpi_gbl_reduced_hardware) {
2675 result = acpi_bus_scan_fixed();
2677 acpi_detach_data(acpi_root->handle,
2678 acpi_scan_drop_device);
2679 acpi_device_del(acpi_root);
2680 put_device(&acpi_root->dev);
2685 acpi_update_all_gpes();
2688 mutex_unlock(&acpi_scan_lock);