2 * scan.c - support for transforming the ACPI namespace into individual objects
5 #include <linux/module.h>
6 #include <linux/init.h>
7 #include <linux/slab.h>
8 #include <linux/kernel.h>
9 #include <linux/acpi.h>
10 #include <linux/signal.h>
11 #include <linux/kthread.h>
12 #include <linux/dmi.h>
13 #include <linux/nls.h>
15 #include <asm/pgtable.h>
19 #define _COMPONENT ACPI_BUS_COMPONENT
20 ACPI_MODULE_NAME("scan");
21 extern struct acpi_device *acpi_root;
23 #define ACPI_BUS_CLASS "system_bus"
24 #define ACPI_BUS_HID "LNXSYBUS"
25 #define ACPI_BUS_DEVICE_NAME "System Bus"
27 #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
29 #define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page)
32 * If set, devices will be hot-removed even if they cannot be put offline
33 * gracefully (from the kernel's standpoint).
35 bool acpi_force_hot_remove;
37 static const char *dummy_hid = "device";
39 static LIST_HEAD(acpi_dep_list);
40 static DEFINE_MUTEX(acpi_dep_list_lock);
41 static LIST_HEAD(acpi_bus_id_list);
42 static DEFINE_MUTEX(acpi_scan_lock);
43 static LIST_HEAD(acpi_scan_handlers_list);
44 DEFINE_MUTEX(acpi_device_lock);
45 LIST_HEAD(acpi_wakeup_device_list);
46 static DEFINE_MUTEX(acpi_hp_context_lock);
48 struct acpi_dep_data {
49 struct list_head node;
54 struct acpi_device_bus_id{
56 unsigned int instance_no;
57 struct list_head node;
60 void acpi_scan_lock_acquire(void)
62 mutex_lock(&acpi_scan_lock);
64 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
66 void acpi_scan_lock_release(void)
68 mutex_unlock(&acpi_scan_lock);
70 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
72 void acpi_lock_hp_context(void)
74 mutex_lock(&acpi_hp_context_lock);
77 void acpi_unlock_hp_context(void)
79 mutex_unlock(&acpi_hp_context_lock);
82 void acpi_initialize_hp_context(struct acpi_device *adev,
83 struct acpi_hotplug_context *hp,
84 int (*notify)(struct acpi_device *, u32),
85 void (*uevent)(struct acpi_device *, u32))
87 acpi_lock_hp_context();
90 acpi_set_hp_context(adev, hp);
91 acpi_unlock_hp_context();
93 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
95 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
100 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
104 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
105 const char *hotplug_profile_name)
109 error = acpi_scan_add_handler(handler);
113 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
118 * create_pnp_modalias - Create hid/cid(s) string for modalias and uevent
119 * @acpi_dev: ACPI device object.
120 * @modalias: Buffer to print into.
121 * @size: Size of the buffer.
123 * Creates hid/cid(s) string needed for modalias and uevent
124 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
125 * char *modalias: "acpi:IBM0001:ACPI0001"
126 * Return: 0: no _HID and no _CID
127 * -EINVAL: output error
128 * -ENOMEM: output is truncated
130 static int create_pnp_modalias(struct acpi_device *acpi_dev, char *modalias,
135 struct acpi_hardware_id *id;
138 * Since we skip PRP0001 from the modalias below, 0 should be returned
139 * if PRP0001 is the only ACPI/PNP ID in the device's list.
142 list_for_each_entry(id, &acpi_dev->pnp.ids, list)
143 if (strcmp(id->id, "PRP0001"))
149 len = snprintf(modalias, size, "acpi:");
155 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
156 if (!strcmp(id->id, "PRP0001"))
159 count = snprintf(&modalias[len], size, "%s:", id->id);
169 modalias[len] = '\0';
174 * create_of_modalias - Creates DT compatible string for modalias and uevent
175 * @acpi_dev: ACPI device object.
176 * @modalias: Buffer to print into.
177 * @size: Size of the buffer.
179 * Expose DT compatible modalias as of:NnameTCcompatible. This function should
180 * only be called for devices having PRP0001 in their list of ACPI/PNP IDs.
182 static int create_of_modalias(struct acpi_device *acpi_dev, char *modalias,
185 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
186 const union acpi_object *of_compatible, *obj;
191 acpi_get_name(acpi_dev->handle, ACPI_SINGLE_NAME, &buf);
192 /* DT strings are all in lower case */
193 for (c = buf.pointer; *c != '\0'; c++)
196 len = snprintf(modalias, size, "of:N%sT", (char *)buf.pointer);
197 ACPI_FREE(buf.pointer);
202 of_compatible = acpi_dev->data.of_compatible;
203 if (of_compatible->type == ACPI_TYPE_PACKAGE) {
204 nval = of_compatible->package.count;
205 obj = of_compatible->package.elements;
206 } else { /* Must be ACPI_TYPE_STRING. */
210 for (i = 0; i < nval; i++, obj++) {
211 count = snprintf(&modalias[len], size, "C%s",
212 obj->string.pointer);
222 modalias[len] = '\0';
227 * acpi_companion_match() - Can we match via ACPI companion device
228 * @dev: Device in question
230 * Check if the given device has an ACPI companion and if that companion has
231 * a valid list of PNP IDs, and if the device is the first (primary) physical
232 * device associated with it. Return the companion pointer if that's the case
235 * If multiple physical devices are attached to a single ACPI companion, we need
236 * to be careful. The usage scenario for this kind of relationship is that all
237 * of the physical devices in question use resources provided by the ACPI
238 * companion. A typical case is an MFD device where all the sub-devices share
239 * the parent's ACPI companion. In such cases we can only allow the primary
240 * (first) physical device to be matched with the help of the companion's PNP
243 * Additional physical devices sharing the ACPI companion can still use
244 * resources available from it but they will be matched normally using functions
245 * provided by their bus types (and analogously for their modalias).
247 static struct acpi_device *acpi_companion_match(const struct device *dev)
249 struct acpi_device *adev;
250 struct mutex *physical_node_lock;
252 adev = ACPI_COMPANION(dev);
256 if (list_empty(&adev->pnp.ids))
259 physical_node_lock = &adev->physical_node_lock;
260 mutex_lock(physical_node_lock);
261 if (list_empty(&adev->physical_node_list)) {
264 const struct acpi_device_physical_node *node;
266 node = list_first_entry(&adev->physical_node_list,
267 struct acpi_device_physical_node, node);
268 if (node->dev != dev)
271 mutex_unlock(physical_node_lock);
276 static int __acpi_device_uevent_modalias(struct acpi_device *adev,
277 struct kobj_uevent_env *env)
284 if (list_empty(&adev->pnp.ids))
287 if (add_uevent_var(env, "MODALIAS="))
290 len = create_pnp_modalias(adev, &env->buf[env->buflen - 1],
291 sizeof(env->buf) - env->buflen);
296 if (!adev->data.of_compatible)
299 if (len > 0 && add_uevent_var(env, "MODALIAS="))
302 len = create_of_modalias(adev, &env->buf[env->buflen - 1],
303 sizeof(env->buf) - env->buflen);
313 * Creates uevent modalias field for ACPI enumerated devices.
314 * Because the other buses does not support ACPI HIDs & CIDs.
315 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
316 * "acpi:IBM0001:ACPI0001"
318 int acpi_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
320 return __acpi_device_uevent_modalias(acpi_companion_match(dev), env);
322 EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias);
324 static int __acpi_device_modalias(struct acpi_device *adev, char *buf, int size)
331 if (list_empty(&adev->pnp.ids))
334 len = create_pnp_modalias(adev, buf, size - 1);
337 } else if (len > 0) {
341 if (!adev->data.of_compatible)
344 count = create_of_modalias(adev, buf + len, size - 1);
347 } else if (count > 0) {
356 * Creates modalias sysfs attribute for ACPI enumerated devices.
357 * Because the other buses does not support ACPI HIDs & CIDs.
358 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
359 * "acpi:IBM0001:ACPI0001"
361 int acpi_device_modalias(struct device *dev, char *buf, int size)
363 return __acpi_device_modalias(acpi_companion_match(dev), buf, size);
365 EXPORT_SYMBOL_GPL(acpi_device_modalias);
368 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
369 return __acpi_device_modalias(to_acpi_device(dev), buf, 1024);
371 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
373 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
375 struct acpi_device_physical_node *pn;
379 * acpi_container_offline() calls this for all of the container's
380 * children under the container's physical_node_lock lock.
382 mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
384 list_for_each_entry(pn, &adev->physical_node_list, node)
385 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
387 kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
393 mutex_unlock(&adev->physical_node_lock);
397 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
400 struct acpi_device *device = NULL;
401 struct acpi_device_physical_node *pn;
402 bool second_pass = (bool)data;
403 acpi_status status = AE_OK;
405 if (acpi_bus_get_device(handle, &device))
408 if (device->handler && !device->handler->hotplug.enabled) {
409 *ret_p = &device->dev;
413 mutex_lock(&device->physical_node_lock);
415 list_for_each_entry(pn, &device->physical_node_list, node) {
419 /* Skip devices offlined by the first pass. */
423 pn->put_online = false;
425 ret = device_offline(pn->dev);
426 if (acpi_force_hot_remove)
430 pn->put_online = !ret;
440 mutex_unlock(&device->physical_node_lock);
445 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
448 struct acpi_device *device = NULL;
449 struct acpi_device_physical_node *pn;
451 if (acpi_bus_get_device(handle, &device))
454 mutex_lock(&device->physical_node_lock);
456 list_for_each_entry(pn, &device->physical_node_list, node)
457 if (pn->put_online) {
458 device_online(pn->dev);
459 pn->put_online = false;
462 mutex_unlock(&device->physical_node_lock);
467 static int acpi_scan_try_to_offline(struct acpi_device *device)
469 acpi_handle handle = device->handle;
470 struct device *errdev = NULL;
474 * Carry out two passes here and ignore errors in the first pass,
475 * because if the devices in question are memory blocks and
476 * CONFIG_MEMCG is set, one of the blocks may hold data structures
477 * that the other blocks depend on, but it is not known in advance which
480 * If the first pass is successful, the second one isn't needed, though.
482 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
483 NULL, acpi_bus_offline, (void *)false,
485 if (status == AE_SUPPORT) {
486 dev_warn(errdev, "Offline disabled.\n");
487 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
488 acpi_bus_online, NULL, NULL, NULL);
491 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
494 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
495 NULL, acpi_bus_offline, (void *)true,
497 if (!errdev || acpi_force_hot_remove)
498 acpi_bus_offline(handle, 0, (void *)true,
501 if (errdev && !acpi_force_hot_remove) {
502 dev_warn(errdev, "Offline failed.\n");
503 acpi_bus_online(handle, 0, NULL, NULL);
504 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
505 ACPI_UINT32_MAX, acpi_bus_online,
513 static int acpi_scan_hot_remove(struct acpi_device *device)
515 acpi_handle handle = device->handle;
516 unsigned long long sta;
519 if (device->handler && device->handler->hotplug.demand_offline
520 && !acpi_force_hot_remove) {
521 if (!acpi_scan_is_offline(device, true))
524 int error = acpi_scan_try_to_offline(device);
529 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
530 "Hot-removing device %s...\n", dev_name(&device->dev)));
532 acpi_bus_trim(device);
534 acpi_evaluate_lck(handle, 0);
538 status = acpi_evaluate_ej0(handle);
539 if (status == AE_NOT_FOUND)
541 else if (ACPI_FAILURE(status))
545 * Verify if eject was indeed successful. If not, log an error
546 * message. No need to call _OST since _EJ0 call was made OK.
548 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
549 if (ACPI_FAILURE(status)) {
550 acpi_handle_warn(handle,
551 "Status check after eject failed (0x%x)\n", status);
552 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
553 acpi_handle_warn(handle,
554 "Eject incomplete - status 0x%llx\n", sta);
560 static int acpi_scan_device_not_present(struct acpi_device *adev)
562 if (!acpi_device_enumerated(adev)) {
563 dev_warn(&adev->dev, "Still not present\n");
570 static int acpi_scan_device_check(struct acpi_device *adev)
574 acpi_bus_get_status(adev);
575 if (adev->status.present || adev->status.functional) {
577 * This function is only called for device objects for which
578 * matching scan handlers exist. The only situation in which
579 * the scan handler is not attached to this device object yet
580 * is when the device has just appeared (either it wasn't
581 * present at all before or it was removed and then added
585 dev_warn(&adev->dev, "Already enumerated\n");
588 error = acpi_bus_scan(adev->handle);
590 dev_warn(&adev->dev, "Namespace scan failure\n");
593 if (!adev->handler) {
594 dev_warn(&adev->dev, "Enumeration failure\n");
598 error = acpi_scan_device_not_present(adev);
603 static int acpi_scan_bus_check(struct acpi_device *adev)
605 struct acpi_scan_handler *handler = adev->handler;
606 struct acpi_device *child;
609 acpi_bus_get_status(adev);
610 if (!(adev->status.present || adev->status.functional)) {
611 acpi_scan_device_not_present(adev);
614 if (handler && handler->hotplug.scan_dependent)
615 return handler->hotplug.scan_dependent(adev);
617 error = acpi_bus_scan(adev->handle);
619 dev_warn(&adev->dev, "Namespace scan failure\n");
622 list_for_each_entry(child, &adev->children, node) {
623 error = acpi_scan_bus_check(child);
630 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
633 case ACPI_NOTIFY_BUS_CHECK:
634 return acpi_scan_bus_check(adev);
635 case ACPI_NOTIFY_DEVICE_CHECK:
636 return acpi_scan_device_check(adev);
637 case ACPI_NOTIFY_EJECT_REQUEST:
638 case ACPI_OST_EC_OSPM_EJECT:
639 if (adev->handler && !adev->handler->hotplug.enabled) {
640 dev_info(&adev->dev, "Eject disabled\n");
643 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
644 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
645 return acpi_scan_hot_remove(adev);
650 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
652 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
655 lock_device_hotplug();
656 mutex_lock(&acpi_scan_lock);
659 * The device object's ACPI handle cannot become invalid as long as we
660 * are holding acpi_scan_lock, but it might have become invalid before
661 * that lock was acquired.
663 if (adev->handle == INVALID_ACPI_HANDLE)
666 if (adev->flags.is_dock_station) {
667 error = dock_notify(adev, src);
668 } else if (adev->flags.hotplug_notify) {
669 error = acpi_generic_hotplug_event(adev, src);
670 if (error == -EPERM) {
671 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
675 int (*notify)(struct acpi_device *, u32);
677 acpi_lock_hp_context();
678 notify = adev->hp ? adev->hp->notify : NULL;
679 acpi_unlock_hp_context();
681 * There may be additional notify handlers for device objects
682 * without the .event() callback, so ignore them here.
685 error = notify(adev, src);
690 ost_code = ACPI_OST_SC_SUCCESS;
693 acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
696 acpi_bus_put_acpi_device(adev);
697 mutex_unlock(&acpi_scan_lock);
698 unlock_device_hotplug();
701 static ssize_t real_power_state_show(struct device *dev,
702 struct device_attribute *attr, char *buf)
704 struct acpi_device *adev = to_acpi_device(dev);
708 ret = acpi_device_get_power(adev, &state);
712 return sprintf(buf, "%s\n", acpi_power_state_string(state));
715 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
717 static ssize_t power_state_show(struct device *dev,
718 struct device_attribute *attr, char *buf)
720 struct acpi_device *adev = to_acpi_device(dev);
722 return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
725 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
728 acpi_eject_store(struct device *d, struct device_attribute *attr,
729 const char *buf, size_t count)
731 struct acpi_device *acpi_device = to_acpi_device(d);
732 acpi_object_type not_used;
735 if (!count || buf[0] != '1')
738 if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
739 && !acpi_device->driver)
742 status = acpi_get_type(acpi_device->handle, ¬_used);
743 if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
746 get_device(&acpi_device->dev);
747 status = acpi_hotplug_schedule(acpi_device, ACPI_OST_EC_OSPM_EJECT);
748 if (ACPI_SUCCESS(status))
751 put_device(&acpi_device->dev);
752 acpi_evaluate_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
753 ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
754 return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
757 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
760 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
761 struct acpi_device *acpi_dev = to_acpi_device(dev);
763 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
765 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
767 static ssize_t acpi_device_uid_show(struct device *dev,
768 struct device_attribute *attr, char *buf)
770 struct acpi_device *acpi_dev = to_acpi_device(dev);
772 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
774 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
776 static ssize_t acpi_device_adr_show(struct device *dev,
777 struct device_attribute *attr, char *buf)
779 struct acpi_device *acpi_dev = to_acpi_device(dev);
781 return sprintf(buf, "0x%08x\n",
782 (unsigned int)(acpi_dev->pnp.bus_address));
784 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
787 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
788 struct acpi_device *acpi_dev = to_acpi_device(dev);
789 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
792 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
796 result = sprintf(buf, "%s\n", (char*)path.pointer);
801 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
803 /* sysfs file that shows description text from the ACPI _STR method */
804 static ssize_t description_show(struct device *dev,
805 struct device_attribute *attr,
807 struct acpi_device *acpi_dev = to_acpi_device(dev);
810 if (acpi_dev->pnp.str_obj == NULL)
814 * The _STR object contains a Unicode identifier for a device.
815 * We need to convert to utf-8 so it can be displayed.
817 result = utf16s_to_utf8s(
818 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
819 acpi_dev->pnp.str_obj->buffer.length,
820 UTF16_LITTLE_ENDIAN, buf,
823 buf[result++] = '\n';
827 static DEVICE_ATTR(description, 0444, description_show, NULL);
830 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
832 struct acpi_device *acpi_dev = to_acpi_device(dev);
834 unsigned long long sun;
836 status = acpi_evaluate_integer(acpi_dev->handle, "_SUN", NULL, &sun);
837 if (ACPI_FAILURE(status))
840 return sprintf(buf, "%llu\n", sun);
842 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
844 static ssize_t status_show(struct device *dev, struct device_attribute *attr,
846 struct acpi_device *acpi_dev = to_acpi_device(dev);
848 unsigned long long sta;
850 status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta);
851 if (ACPI_FAILURE(status))
854 return sprintf(buf, "%llu\n", sta);
856 static DEVICE_ATTR_RO(status);
858 static int acpi_device_setup_files(struct acpi_device *dev)
860 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
865 * Devices gotten from FADT don't have a "path" attribute
868 result = device_create_file(&dev->dev, &dev_attr_path);
873 if (!list_empty(&dev->pnp.ids)) {
874 result = device_create_file(&dev->dev, &dev_attr_hid);
878 result = device_create_file(&dev->dev, &dev_attr_modalias);
884 * If device has _STR, 'description' file is created
886 if (acpi_has_method(dev->handle, "_STR")) {
887 status = acpi_evaluate_object(dev->handle, "_STR",
889 if (ACPI_FAILURE(status))
890 buffer.pointer = NULL;
891 dev->pnp.str_obj = buffer.pointer;
892 result = device_create_file(&dev->dev, &dev_attr_description);
897 if (dev->pnp.type.bus_address)
898 result = device_create_file(&dev->dev, &dev_attr_adr);
899 if (dev->pnp.unique_id)
900 result = device_create_file(&dev->dev, &dev_attr_uid);
902 if (acpi_has_method(dev->handle, "_SUN")) {
903 result = device_create_file(&dev->dev, &dev_attr_sun);
908 if (acpi_has_method(dev->handle, "_STA")) {
909 result = device_create_file(&dev->dev, &dev_attr_status);
915 * If device has _EJ0, 'eject' file is created that is used to trigger
916 * hot-removal function from userland.
918 if (acpi_has_method(dev->handle, "_EJ0")) {
919 result = device_create_file(&dev->dev, &dev_attr_eject);
924 if (dev->flags.power_manageable) {
925 result = device_create_file(&dev->dev, &dev_attr_power_state);
929 if (dev->power.flags.power_resources)
930 result = device_create_file(&dev->dev,
931 &dev_attr_real_power_state);
938 static void acpi_device_remove_files(struct acpi_device *dev)
940 if (dev->flags.power_manageable) {
941 device_remove_file(&dev->dev, &dev_attr_power_state);
942 if (dev->power.flags.power_resources)
943 device_remove_file(&dev->dev,
944 &dev_attr_real_power_state);
948 * If device has _STR, remove 'description' file
950 if (acpi_has_method(dev->handle, "_STR")) {
951 kfree(dev->pnp.str_obj);
952 device_remove_file(&dev->dev, &dev_attr_description);
955 * If device has _EJ0, remove 'eject' file.
957 if (acpi_has_method(dev->handle, "_EJ0"))
958 device_remove_file(&dev->dev, &dev_attr_eject);
960 if (acpi_has_method(dev->handle, "_SUN"))
961 device_remove_file(&dev->dev, &dev_attr_sun);
963 if (dev->pnp.unique_id)
964 device_remove_file(&dev->dev, &dev_attr_uid);
965 if (dev->pnp.type.bus_address)
966 device_remove_file(&dev->dev, &dev_attr_adr);
967 device_remove_file(&dev->dev, &dev_attr_modalias);
968 device_remove_file(&dev->dev, &dev_attr_hid);
969 if (acpi_has_method(dev->handle, "_STA"))
970 device_remove_file(&dev->dev, &dev_attr_status);
972 device_remove_file(&dev->dev, &dev_attr_path);
974 /* --------------------------------------------------------------------------
976 -------------------------------------------------------------------------- */
979 * acpi_of_match_device - Match device object using the "compatible" property.
980 * @adev: ACPI device object to match.
981 * @of_match_table: List of device IDs to match against.
983 * If @dev has an ACPI companion which has the special PRP0001 device ID in its
984 * list of identifiers and a _DSD object with the "compatible" property, use
985 * that property to match against the given list of identifiers.
987 static bool acpi_of_match_device(struct acpi_device *adev,
988 const struct of_device_id *of_match_table)
990 const union acpi_object *of_compatible, *obj;
996 of_compatible = adev->data.of_compatible;
997 if (!of_match_table || !of_compatible)
1000 if (of_compatible->type == ACPI_TYPE_PACKAGE) {
1001 nval = of_compatible->package.count;
1002 obj = of_compatible->package.elements;
1003 } else { /* Must be ACPI_TYPE_STRING. */
1005 obj = of_compatible;
1007 /* Now we can look for the driver DT compatible strings */
1008 for (i = 0; i < nval; i++, obj++) {
1009 const struct of_device_id *id;
1011 for (id = of_match_table; id->compatible[0]; id++)
1012 if (!strcasecmp(obj->string.pointer, id->compatible))
1019 static const struct acpi_device_id *__acpi_match_device(
1020 struct acpi_device *device,
1021 const struct acpi_device_id *ids,
1022 const struct of_device_id *of_ids)
1024 const struct acpi_device_id *id;
1025 struct acpi_hardware_id *hwid;
1028 * If the device is not present, it is unnecessary to load device
1031 if (!device || !device->status.present)
1034 list_for_each_entry(hwid, &device->pnp.ids, list) {
1035 /* First, check the ACPI/PNP IDs provided by the caller. */
1036 for (id = ids; id->id[0]; id++)
1037 if (!strcmp((char *) id->id, hwid->id))
1041 * Next, check the special "PRP0001" ID and try to match the
1042 * "compatible" property if found.
1044 * The id returned by the below is not valid, but the only
1045 * caller passing non-NULL of_ids here is only interested in
1046 * whether or not the return value is NULL.
1048 if (!strcmp("PRP0001", hwid->id)
1049 && acpi_of_match_device(device, of_ids))
1056 * acpi_match_device - Match a struct device against a given list of ACPI IDs
1057 * @ids: Array of struct acpi_device_id object to match against.
1058 * @dev: The device structure to match.
1060 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
1061 * object for that handle and use that object to match against a given list of
1064 * Return a pointer to the first matching ID on success or %NULL on failure.
1066 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
1067 const struct device *dev)
1069 return __acpi_match_device(acpi_companion_match(dev), ids, NULL);
1071 EXPORT_SYMBOL_GPL(acpi_match_device);
1073 int acpi_match_device_ids(struct acpi_device *device,
1074 const struct acpi_device_id *ids)
1076 return __acpi_match_device(device, ids, NULL) ? 0 : -ENOENT;
1078 EXPORT_SYMBOL(acpi_match_device_ids);
1080 bool acpi_driver_match_device(struct device *dev,
1081 const struct device_driver *drv)
1083 if (!drv->acpi_match_table)
1084 return acpi_of_match_device(ACPI_COMPANION(dev),
1085 drv->of_match_table);
1087 return !!__acpi_match_device(acpi_companion_match(dev),
1088 drv->acpi_match_table, drv->of_match_table);
1090 EXPORT_SYMBOL_GPL(acpi_driver_match_device);
1092 static void acpi_free_power_resources_lists(struct acpi_device *device)
1096 if (device->wakeup.flags.valid)
1097 acpi_power_resources_list_free(&device->wakeup.resources);
1099 if (!device->power.flags.power_resources)
1102 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
1103 struct acpi_device_power_state *ps = &device->power.states[i];
1104 acpi_power_resources_list_free(&ps->resources);
1108 static void acpi_device_release(struct device *dev)
1110 struct acpi_device *acpi_dev = to_acpi_device(dev);
1112 acpi_free_properties(acpi_dev);
1113 acpi_free_pnp_ids(&acpi_dev->pnp);
1114 acpi_free_power_resources_lists(acpi_dev);
1118 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
1120 struct acpi_device *acpi_dev = to_acpi_device(dev);
1121 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
1123 return acpi_dev->flags.match_driver
1124 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
1127 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
1129 return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
1132 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
1134 struct acpi_device *device = data;
1136 device->driver->ops.notify(device, event);
1139 static void acpi_device_notify_fixed(void *data)
1141 struct acpi_device *device = data;
1143 /* Fixed hardware devices have no handles */
1144 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
1147 static u32 acpi_device_fixed_event(void *data)
1149 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
1150 return ACPI_INTERRUPT_HANDLED;
1153 static int acpi_device_install_notify_handler(struct acpi_device *device)
1157 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
1159 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
1160 acpi_device_fixed_event,
1162 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
1164 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
1165 acpi_device_fixed_event,
1168 status = acpi_install_notify_handler(device->handle,
1173 if (ACPI_FAILURE(status))
1178 static void acpi_device_remove_notify_handler(struct acpi_device *device)
1180 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
1181 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
1182 acpi_device_fixed_event);
1183 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
1184 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
1185 acpi_device_fixed_event);
1187 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
1188 acpi_device_notify);
1191 static int acpi_device_probe(struct device *dev)
1193 struct acpi_device *acpi_dev = to_acpi_device(dev);
1194 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1197 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
1200 if (!acpi_drv->ops.add)
1203 ret = acpi_drv->ops.add(acpi_dev);
1207 acpi_dev->driver = acpi_drv;
1208 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1209 "Driver [%s] successfully bound to device [%s]\n",
1210 acpi_drv->name, acpi_dev->pnp.bus_id));
1212 if (acpi_drv->ops.notify) {
1213 ret = acpi_device_install_notify_handler(acpi_dev);
1215 if (acpi_drv->ops.remove)
1216 acpi_drv->ops.remove(acpi_dev);
1218 acpi_dev->driver = NULL;
1219 acpi_dev->driver_data = NULL;
1224 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
1225 acpi_drv->name, acpi_dev->pnp.bus_id));
1230 static int acpi_device_remove(struct device * dev)
1232 struct acpi_device *acpi_dev = to_acpi_device(dev);
1233 struct acpi_driver *acpi_drv = acpi_dev->driver;
1236 if (acpi_drv->ops.notify)
1237 acpi_device_remove_notify_handler(acpi_dev);
1238 if (acpi_drv->ops.remove)
1239 acpi_drv->ops.remove(acpi_dev);
1241 acpi_dev->driver = NULL;
1242 acpi_dev->driver_data = NULL;
1248 struct bus_type acpi_bus_type = {
1250 .match = acpi_bus_match,
1251 .probe = acpi_device_probe,
1252 .remove = acpi_device_remove,
1253 .uevent = acpi_device_uevent,
1256 static void acpi_device_del(struct acpi_device *device)
1258 mutex_lock(&acpi_device_lock);
1260 list_del(&device->node);
1262 list_del(&device->wakeup_list);
1263 mutex_unlock(&acpi_device_lock);
1265 acpi_power_add_remove_device(device, false);
1266 acpi_device_remove_files(device);
1268 device->remove(device);
1270 device_del(&device->dev);
1273 static LIST_HEAD(acpi_device_del_list);
1274 static DEFINE_MUTEX(acpi_device_del_lock);
1276 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
1279 struct acpi_device *adev;
1281 mutex_lock(&acpi_device_del_lock);
1283 if (list_empty(&acpi_device_del_list)) {
1284 mutex_unlock(&acpi_device_del_lock);
1287 adev = list_first_entry(&acpi_device_del_list,
1288 struct acpi_device, del_list);
1289 list_del(&adev->del_list);
1291 mutex_unlock(&acpi_device_del_lock);
1293 acpi_device_del(adev);
1295 * Drop references to all power resources that might have been
1296 * used by the device.
1298 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
1299 put_device(&adev->dev);
1304 * acpi_scan_drop_device - Drop an ACPI device object.
1305 * @handle: Handle of an ACPI namespace node, not used.
1306 * @context: Address of the ACPI device object to drop.
1308 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
1309 * namespace node the device object pointed to by @context is attached to.
1311 * The unregistration is carried out asynchronously to avoid running
1312 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
1313 * ensure the correct ordering (the device objects must be unregistered in the
1314 * same order in which the corresponding namespace nodes are deleted).
1316 static void acpi_scan_drop_device(acpi_handle handle, void *context)
1318 static DECLARE_WORK(work, acpi_device_del_work_fn);
1319 struct acpi_device *adev = context;
1321 mutex_lock(&acpi_device_del_lock);
1324 * Use the ACPI hotplug workqueue which is ordered, so this work item
1325 * won't run after any hotplug work items submitted subsequently. That
1326 * prevents attempts to register device objects identical to those being
1327 * deleted from happening concurrently (such attempts result from
1328 * hotplug events handled via the ACPI hotplug workqueue). It also will
1329 * run after all of the work items submitted previosuly, which helps
1330 * those work items to ensure that they are not accessing stale device
1333 if (list_empty(&acpi_device_del_list))
1334 acpi_queue_hotplug_work(&work);
1336 list_add_tail(&adev->del_list, &acpi_device_del_list);
1337 /* Make acpi_ns_validate_handle() return NULL for this handle. */
1338 adev->handle = INVALID_ACPI_HANDLE;
1340 mutex_unlock(&acpi_device_del_lock);
1343 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
1344 void (*callback)(void *))
1351 status = acpi_get_data_full(handle, acpi_scan_drop_device,
1352 (void **)device, callback);
1353 if (ACPI_FAILURE(status) || !*device) {
1354 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
1361 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
1363 return acpi_get_device_data(handle, device, NULL);
1365 EXPORT_SYMBOL(acpi_bus_get_device);
1367 static void get_acpi_device(void *dev)
1370 get_device(&((struct acpi_device *)dev)->dev);
1373 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
1375 struct acpi_device *adev = NULL;
1377 acpi_get_device_data(handle, &adev, get_acpi_device);
1381 void acpi_bus_put_acpi_device(struct acpi_device *adev)
1383 put_device(&adev->dev);
1386 int acpi_device_add(struct acpi_device *device,
1387 void (*release)(struct device *))
1390 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
1393 if (device->handle) {
1396 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
1398 if (ACPI_FAILURE(status)) {
1399 acpi_handle_err(device->handle,
1400 "Unable to attach device data\n");
1408 * Link this device to its parent and siblings.
1410 INIT_LIST_HEAD(&device->children);
1411 INIT_LIST_HEAD(&device->node);
1412 INIT_LIST_HEAD(&device->wakeup_list);
1413 INIT_LIST_HEAD(&device->physical_node_list);
1414 INIT_LIST_HEAD(&device->del_list);
1415 mutex_init(&device->physical_node_lock);
1417 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
1419 pr_err(PREFIX "Memory allocation error\n");
1424 mutex_lock(&acpi_device_lock);
1426 * Find suitable bus_id and instance number in acpi_bus_id_list
1427 * If failed, create one and link it into acpi_bus_id_list
1429 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1430 if (!strcmp(acpi_device_bus_id->bus_id,
1431 acpi_device_hid(device))) {
1432 acpi_device_bus_id->instance_no++;
1439 acpi_device_bus_id = new_bus_id;
1440 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1441 acpi_device_bus_id->instance_no = 0;
1442 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1444 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1447 list_add_tail(&device->node, &device->parent->children);
1449 if (device->wakeup.flags.valid)
1450 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1451 mutex_unlock(&acpi_device_lock);
1454 device->dev.parent = &device->parent->dev;
1455 device->dev.bus = &acpi_bus_type;
1456 device->dev.release = release;
1457 result = device_add(&device->dev);
1459 dev_err(&device->dev, "Error registering device\n");
1463 result = acpi_device_setup_files(device);
1465 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1466 dev_name(&device->dev));
1471 mutex_lock(&acpi_device_lock);
1473 list_del(&device->node);
1474 list_del(&device->wakeup_list);
1475 mutex_unlock(&acpi_device_lock);
1478 acpi_detach_data(device->handle, acpi_scan_drop_device);
1482 struct acpi_device *acpi_get_next_child(struct device *dev,
1483 struct acpi_device *child)
1485 struct acpi_device *adev = ACPI_COMPANION(dev);
1486 struct list_head *head, *next;
1491 head = &adev->children;
1492 if (list_empty(head))
1496 return list_first_entry(head, struct acpi_device, node);
1498 next = child->node.next;
1499 return next == head ? NULL : list_entry(next, struct acpi_device, node);
1502 /* --------------------------------------------------------------------------
1504 -------------------------------------------------------------------------- */
1506 * acpi_bus_register_driver - register a driver with the ACPI bus
1507 * @driver: driver being registered
1509 * Registers a driver with the ACPI bus. Searches the namespace for all
1510 * devices that match the driver's criteria and binds. Returns zero for
1511 * success or a negative error status for failure.
1513 int acpi_bus_register_driver(struct acpi_driver *driver)
1519 driver->drv.name = driver->name;
1520 driver->drv.bus = &acpi_bus_type;
1521 driver->drv.owner = driver->owner;
1523 ret = driver_register(&driver->drv);
1527 EXPORT_SYMBOL(acpi_bus_register_driver);
1530 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1531 * @driver: driver to unregister
1533 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1534 * devices that match the driver's criteria and unbinds.
1536 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1538 driver_unregister(&driver->drv);
1541 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1543 /* --------------------------------------------------------------------------
1545 -------------------------------------------------------------------------- */
1546 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1548 struct acpi_device *device = NULL;
1552 * Fixed hardware devices do not appear in the namespace and do not
1553 * have handles, but we fabricate acpi_devices for them, so we have
1554 * to deal with them specially.
1560 status = acpi_get_parent(handle, &handle);
1561 if (ACPI_FAILURE(status))
1562 return status == AE_NULL_ENTRY ? NULL : acpi_root;
1563 } while (acpi_bus_get_device(handle, &device));
1568 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1572 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1573 union acpi_object *obj;
1575 status = acpi_get_handle(handle, "_EJD", &tmp);
1576 if (ACPI_FAILURE(status))
1579 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1580 if (ACPI_SUCCESS(status)) {
1581 obj = buffer.pointer;
1582 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1584 kfree(buffer.pointer);
1588 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1590 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1591 struct acpi_device_wakeup *wakeup)
1593 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1594 union acpi_object *package = NULL;
1595 union acpi_object *element = NULL;
1602 INIT_LIST_HEAD(&wakeup->resources);
1605 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1606 if (ACPI_FAILURE(status)) {
1607 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1611 package = (union acpi_object *)buffer.pointer;
1613 if (!package || package->package.count < 2)
1616 element = &(package->package.elements[0]);
1620 if (element->type == ACPI_TYPE_PACKAGE) {
1621 if ((element->package.count < 2) ||
1622 (element->package.elements[0].type !=
1623 ACPI_TYPE_LOCAL_REFERENCE)
1624 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1627 wakeup->gpe_device =
1628 element->package.elements[0].reference.handle;
1629 wakeup->gpe_number =
1630 (u32) element->package.elements[1].integer.value;
1631 } else if (element->type == ACPI_TYPE_INTEGER) {
1632 wakeup->gpe_device = NULL;
1633 wakeup->gpe_number = element->integer.value;
1638 element = &(package->package.elements[1]);
1639 if (element->type != ACPI_TYPE_INTEGER)
1642 wakeup->sleep_state = element->integer.value;
1644 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1648 if (!list_empty(&wakeup->resources)) {
1651 err = acpi_power_wakeup_list_init(&wakeup->resources,
1654 acpi_handle_warn(handle, "Retrieving current states "
1655 "of wakeup power resources failed\n");
1656 acpi_power_resources_list_free(&wakeup->resources);
1659 if (sleep_state < wakeup->sleep_state) {
1660 acpi_handle_warn(handle, "Overriding _PRW sleep state "
1661 "(S%d) by S%d from power resources\n",
1662 (int)wakeup->sleep_state, sleep_state);
1663 wakeup->sleep_state = sleep_state;
1668 kfree(buffer.pointer);
1672 static void acpi_wakeup_gpe_init(struct acpi_device *device)
1674 struct acpi_device_id button_device_ids[] = {
1680 struct acpi_device_wakeup *wakeup = &device->wakeup;
1682 acpi_event_status event_status;
1684 wakeup->flags.notifier_present = 0;
1686 /* Power button, Lid switch always enable wakeup */
1687 if (!acpi_match_device_ids(device, button_device_ids)) {
1688 wakeup->flags.run_wake = 1;
1689 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1690 /* Do not use Lid/sleep button for S5 wakeup */
1691 if (wakeup->sleep_state == ACPI_STATE_S5)
1692 wakeup->sleep_state = ACPI_STATE_S4;
1694 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
1695 device_set_wakeup_capable(&device->dev, true);
1699 acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
1700 wakeup->gpe_number);
1701 status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number,
1703 if (ACPI_FAILURE(status))
1706 wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HAS_HANDLER);
1709 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1713 /* Presence of _PRW indicates wake capable */
1714 if (!acpi_has_method(device->handle, "_PRW"))
1717 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1720 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1724 device->wakeup.flags.valid = 1;
1725 device->wakeup.prepare_count = 0;
1726 acpi_wakeup_gpe_init(device);
1727 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1728 * system for the ACPI device with the _PRW object.
1729 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1730 * So it is necessary to call _DSW object first. Only when it is not
1731 * present will the _PSW object used.
1733 err = acpi_device_sleep_wake(device, 0, 0, 0);
1735 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1736 "error in _DSW or _PSW evaluation\n"));
1739 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1741 struct acpi_device_power_state *ps = &device->power.states[state];
1742 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1743 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1746 INIT_LIST_HEAD(&ps->resources);
1748 /* Evaluate "_PRx" to get referenced power resources */
1749 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1750 if (ACPI_SUCCESS(status)) {
1751 union acpi_object *package = buffer.pointer;
1753 if (buffer.length && package
1754 && package->type == ACPI_TYPE_PACKAGE
1755 && package->package.count) {
1756 int err = acpi_extract_power_resources(package, 0,
1759 device->power.flags.power_resources = 1;
1761 ACPI_FREE(buffer.pointer);
1764 /* Evaluate "_PSx" to see if we can do explicit sets */
1766 if (acpi_has_method(device->handle, pathname))
1767 ps->flags.explicit_set = 1;
1770 * State is valid if there are means to put the device into it.
1771 * D3hot is only valid if _PR3 present.
1773 if (!list_empty(&ps->resources)
1774 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1775 ps->flags.valid = 1;
1776 ps->flags.os_accessible = 1;
1779 ps->power = -1; /* Unknown - driver assigned */
1780 ps->latency = -1; /* Unknown - driver assigned */
1783 static void acpi_bus_get_power_flags(struct acpi_device *device)
1787 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1788 if (!acpi_has_method(device->handle, "_PS0") &&
1789 !acpi_has_method(device->handle, "_PR0"))
1792 device->flags.power_manageable = 1;
1795 * Power Management Flags
1797 if (acpi_has_method(device->handle, "_PSC"))
1798 device->power.flags.explicit_get = 1;
1800 if (acpi_has_method(device->handle, "_IRC"))
1801 device->power.flags.inrush_current = 1;
1803 if (acpi_has_method(device->handle, "_DSW"))
1804 device->power.flags.dsw_present = 1;
1807 * Enumerate supported power management states
1809 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1810 acpi_bus_init_power_state(device, i);
1812 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1814 /* Set defaults for D0 and D3 states (always valid) */
1815 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1816 device->power.states[ACPI_STATE_D0].power = 100;
1817 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1818 device->power.states[ACPI_STATE_D3_COLD].power = 0;
1820 /* Set D3cold's explicit_set flag if _PS3 exists. */
1821 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1822 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1824 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1825 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1826 device->power.flags.power_resources)
1827 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1829 if (acpi_bus_init_power(device))
1830 device->flags.power_manageable = 0;
1833 static void acpi_bus_get_flags(struct acpi_device *device)
1835 /* Presence of _STA indicates 'dynamic_status' */
1836 if (acpi_has_method(device->handle, "_STA"))
1837 device->flags.dynamic_status = 1;
1839 /* Presence of _RMV indicates 'removable' */
1840 if (acpi_has_method(device->handle, "_RMV"))
1841 device->flags.removable = 1;
1843 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1844 if (acpi_has_method(device->handle, "_EJD") ||
1845 acpi_has_method(device->handle, "_EJ0"))
1846 device->flags.ejectable = 1;
1849 static void acpi_device_get_busid(struct acpi_device *device)
1851 char bus_id[5] = { '?', 0 };
1852 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1858 * The device's Bus ID is simply the object name.
1859 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1861 if (ACPI_IS_ROOT_DEVICE(device)) {
1862 strcpy(device->pnp.bus_id, "ACPI");
1866 switch (device->device_type) {
1867 case ACPI_BUS_TYPE_POWER_BUTTON:
1868 strcpy(device->pnp.bus_id, "PWRF");
1870 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1871 strcpy(device->pnp.bus_id, "SLPF");
1874 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1875 /* Clean up trailing underscores (if any) */
1876 for (i = 3; i > 1; i--) {
1877 if (bus_id[i] == '_')
1882 strcpy(device->pnp.bus_id, bus_id);
1888 * acpi_ata_match - see if an acpi object is an ATA device
1890 * If an acpi object has one of the ACPI ATA methods defined,
1891 * then we can safely call it an ATA device.
1893 bool acpi_ata_match(acpi_handle handle)
1895 return acpi_has_method(handle, "_GTF") ||
1896 acpi_has_method(handle, "_GTM") ||
1897 acpi_has_method(handle, "_STM") ||
1898 acpi_has_method(handle, "_SDD");
1902 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1904 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1905 * then we can safely call it an ejectable drive bay
1907 bool acpi_bay_match(acpi_handle handle)
1909 acpi_handle phandle;
1911 if (!acpi_has_method(handle, "_EJ0"))
1913 if (acpi_ata_match(handle))
1915 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1918 return acpi_ata_match(phandle);
1921 bool acpi_device_is_battery(struct acpi_device *adev)
1923 struct acpi_hardware_id *hwid;
1925 list_for_each_entry(hwid, &adev->pnp.ids, list)
1926 if (!strcmp("PNP0C0A", hwid->id))
1932 static bool is_ejectable_bay(struct acpi_device *adev)
1934 acpi_handle handle = adev->handle;
1936 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1939 return acpi_bay_match(handle);
1943 * acpi_dock_match - see if an acpi object has a _DCK method
1945 bool acpi_dock_match(acpi_handle handle)
1947 return acpi_has_method(handle, "_DCK");
1950 const char *acpi_device_hid(struct acpi_device *device)
1952 struct acpi_hardware_id *hid;
1954 if (list_empty(&device->pnp.ids))
1957 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1960 EXPORT_SYMBOL(acpi_device_hid);
1962 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1964 struct acpi_hardware_id *id;
1966 id = kmalloc(sizeof(*id), GFP_KERNEL);
1970 id->id = kstrdup(dev_id, GFP_KERNEL);
1976 list_add_tail(&id->list, &pnp->ids);
1977 pnp->type.hardware_id = 1;
1981 * Old IBM workstations have a DSDT bug wherein the SMBus object
1982 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1983 * prefix. Work around this.
1985 static bool acpi_ibm_smbus_match(acpi_handle handle)
1987 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1988 struct acpi_buffer path = { sizeof(node_name), node_name };
1990 if (!dmi_name_in_vendors("IBM"))
1993 /* Look for SMBS object */
1994 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1995 strcmp("SMBS", path.pointer))
1998 /* Does it have the necessary (but misnamed) methods? */
1999 if (acpi_has_method(handle, "SBI") &&
2000 acpi_has_method(handle, "SBR") &&
2001 acpi_has_method(handle, "SBW"))
2007 static bool acpi_object_is_system_bus(acpi_handle handle)
2011 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
2014 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
2021 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
2025 struct acpi_device_info *info;
2026 struct acpi_pnp_device_id_list *cid_list;
2029 switch (device_type) {
2030 case ACPI_BUS_TYPE_DEVICE:
2031 if (handle == ACPI_ROOT_OBJECT) {
2032 acpi_add_id(pnp, ACPI_SYSTEM_HID);
2036 status = acpi_get_object_info(handle, &info);
2037 if (ACPI_FAILURE(status)) {
2038 pr_err(PREFIX "%s: Error reading device info\n",
2043 if (info->valid & ACPI_VALID_HID) {
2044 acpi_add_id(pnp, info->hardware_id.string);
2045 pnp->type.platform_id = 1;
2047 if (info->valid & ACPI_VALID_CID) {
2048 cid_list = &info->compatible_id_list;
2049 for (i = 0; i < cid_list->count; i++)
2050 acpi_add_id(pnp, cid_list->ids[i].string);
2052 if (info->valid & ACPI_VALID_ADR) {
2053 pnp->bus_address = info->address;
2054 pnp->type.bus_address = 1;
2056 if (info->valid & ACPI_VALID_UID)
2057 pnp->unique_id = kstrdup(info->unique_id.string,
2063 * Some devices don't reliably have _HIDs & _CIDs, so add
2064 * synthetic HIDs to make sure drivers can find them.
2066 if (acpi_is_video_device(handle))
2067 acpi_add_id(pnp, ACPI_VIDEO_HID);
2068 else if (acpi_bay_match(handle))
2069 acpi_add_id(pnp, ACPI_BAY_HID);
2070 else if (acpi_dock_match(handle))
2071 acpi_add_id(pnp, ACPI_DOCK_HID);
2072 else if (acpi_ibm_smbus_match(handle))
2073 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
2074 else if (list_empty(&pnp->ids) &&
2075 acpi_object_is_system_bus(handle)) {
2076 /* \_SB, \_TZ, LNXSYBUS */
2077 acpi_add_id(pnp, ACPI_BUS_HID);
2078 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
2079 strcpy(pnp->device_class, ACPI_BUS_CLASS);
2083 case ACPI_BUS_TYPE_POWER:
2084 acpi_add_id(pnp, ACPI_POWER_HID);
2086 case ACPI_BUS_TYPE_PROCESSOR:
2087 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
2089 case ACPI_BUS_TYPE_THERMAL:
2090 acpi_add_id(pnp, ACPI_THERMAL_HID);
2092 case ACPI_BUS_TYPE_POWER_BUTTON:
2093 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
2095 case ACPI_BUS_TYPE_SLEEP_BUTTON:
2096 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
2101 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
2103 struct acpi_hardware_id *id, *tmp;
2105 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
2109 kfree(pnp->unique_id);
2112 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
2113 int type, unsigned long long sta)
2115 INIT_LIST_HEAD(&device->pnp.ids);
2116 device->device_type = type;
2117 device->handle = handle;
2118 device->parent = acpi_bus_get_parent(handle);
2119 device->fwnode.type = FWNODE_ACPI;
2120 acpi_set_device_status(device, sta);
2121 acpi_device_get_busid(device);
2122 acpi_set_pnp_ids(handle, &device->pnp, type);
2123 acpi_init_properties(device);
2124 acpi_bus_get_flags(device);
2125 device->flags.match_driver = false;
2126 device->flags.initialized = true;
2127 device->flags.visited = false;
2128 device_initialize(&device->dev);
2129 dev_set_uevent_suppress(&device->dev, true);
2132 void acpi_device_add_finalize(struct acpi_device *device)
2134 dev_set_uevent_suppress(&device->dev, false);
2135 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
2138 static int acpi_add_single_object(struct acpi_device **child,
2139 acpi_handle handle, int type,
2140 unsigned long long sta)
2143 struct acpi_device *device;
2144 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
2146 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
2148 printk(KERN_ERR PREFIX "Memory allocation error\n");
2152 acpi_init_device_object(device, handle, type, sta);
2153 acpi_bus_get_power_flags(device);
2154 acpi_bus_get_wakeup_device_flags(device);
2156 result = acpi_device_add(device, acpi_device_release);
2158 acpi_device_release(&device->dev);
2162 acpi_power_add_remove_device(device, true);
2163 acpi_device_add_finalize(device);
2164 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
2165 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
2166 dev_name(&device->dev), (char *) buffer.pointer,
2167 device->parent ? dev_name(&device->parent->dev) : "(null)"));
2168 kfree(buffer.pointer);
2173 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
2174 unsigned long long *sta)
2177 acpi_object_type acpi_type;
2179 status = acpi_get_type(handle, &acpi_type);
2180 if (ACPI_FAILURE(status))
2183 switch (acpi_type) {
2184 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
2185 case ACPI_TYPE_DEVICE:
2186 *type = ACPI_BUS_TYPE_DEVICE;
2187 status = acpi_bus_get_status_handle(handle, sta);
2188 if (ACPI_FAILURE(status))
2191 case ACPI_TYPE_PROCESSOR:
2192 *type = ACPI_BUS_TYPE_PROCESSOR;
2193 status = acpi_bus_get_status_handle(handle, sta);
2194 if (ACPI_FAILURE(status))
2197 case ACPI_TYPE_THERMAL:
2198 *type = ACPI_BUS_TYPE_THERMAL;
2199 *sta = ACPI_STA_DEFAULT;
2201 case ACPI_TYPE_POWER:
2202 *type = ACPI_BUS_TYPE_POWER;
2203 *sta = ACPI_STA_DEFAULT;
2212 bool acpi_device_is_present(struct acpi_device *adev)
2214 if (adev->status.present || adev->status.functional)
2217 adev->flags.initialized = false;
2221 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
2223 const struct acpi_device_id **matchid)
2225 const struct acpi_device_id *devid;
2228 return handler->match(idstr, matchid);
2230 for (devid = handler->ids; devid->id[0]; devid++)
2231 if (!strcmp((char *)devid->id, idstr)) {
2241 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
2242 const struct acpi_device_id **matchid)
2244 struct acpi_scan_handler *handler;
2246 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
2247 if (acpi_scan_handler_matching(handler, idstr, matchid))
2253 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
2255 if (!!hotplug->enabled == !!val)
2258 mutex_lock(&acpi_scan_lock);
2260 hotplug->enabled = val;
2262 mutex_unlock(&acpi_scan_lock);
2265 static void acpi_scan_init_hotplug(struct acpi_device *adev)
2267 struct acpi_hardware_id *hwid;
2269 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
2270 acpi_dock_add(adev);
2273 list_for_each_entry(hwid, &adev->pnp.ids, list) {
2274 struct acpi_scan_handler *handler;
2276 handler = acpi_scan_match_handler(hwid->id, NULL);
2278 adev->flags.hotplug_notify = true;
2284 static void acpi_device_dep_initialize(struct acpi_device *adev)
2286 struct acpi_dep_data *dep;
2287 struct acpi_handle_list dep_devices;
2291 if (!acpi_has_method(adev->handle, "_DEP"))
2294 status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
2296 if (ACPI_FAILURE(status)) {
2297 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
2301 for (i = 0; i < dep_devices.count; i++) {
2302 struct acpi_device_info *info;
2305 status = acpi_get_object_info(dep_devices.handles[i], &info);
2306 if (ACPI_FAILURE(status)) {
2307 dev_dbg(&adev->dev, "Error reading _DEP device info\n");
2312 * Skip the dependency of Windows System Power
2313 * Management Controller
2315 skip = info->valid & ACPI_VALID_HID &&
2316 !strcmp(info->hardware_id.string, "INT3396");
2323 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
2327 dep->master = dep_devices.handles[i];
2328 dep->slave = adev->handle;
2331 mutex_lock(&acpi_dep_list_lock);
2332 list_add_tail(&dep->node , &acpi_dep_list);
2333 mutex_unlock(&acpi_dep_list_lock);
2337 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
2338 void *not_used, void **return_value)
2340 struct acpi_device *device = NULL;
2342 unsigned long long sta;
2345 acpi_bus_get_device(handle, &device);
2349 result = acpi_bus_type_and_status(handle, &type, &sta);
2353 if (type == ACPI_BUS_TYPE_POWER) {
2354 acpi_add_power_resource(handle);
2358 acpi_add_single_object(&device, handle, type, sta);
2360 return AE_CTRL_DEPTH;
2362 acpi_scan_init_hotplug(device);
2363 acpi_device_dep_initialize(device);
2367 *return_value = device;
2372 static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
2374 bool *is_spi_i2c_slave_p = data;
2376 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
2380 * devices that are connected to UART still need to be enumerated to
2383 if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
2384 *is_spi_i2c_slave_p = true;
2386 /* no need to do more checking */
2390 static void acpi_default_enumeration(struct acpi_device *device)
2392 struct list_head resource_list;
2393 bool is_spi_i2c_slave = false;
2396 * Do not enemerate SPI/I2C slaves as they will be enuerated by their
2397 * respective parents.
2399 INIT_LIST_HEAD(&resource_list);
2400 acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
2402 acpi_dev_free_resource_list(&resource_list);
2403 if (!is_spi_i2c_slave)
2404 acpi_create_platform_device(device);
2407 static const struct acpi_device_id generic_device_ids[] = {
2412 static int acpi_generic_device_attach(struct acpi_device *adev,
2413 const struct acpi_device_id *not_used)
2416 * Since PRP0001 is the only ID handled here, the test below can be
2419 if (adev->data.of_compatible)
2420 acpi_default_enumeration(adev);
2425 static struct acpi_scan_handler generic_device_handler = {
2426 .ids = generic_device_ids,
2427 .attach = acpi_generic_device_attach,
2430 static int acpi_scan_attach_handler(struct acpi_device *device)
2432 struct acpi_hardware_id *hwid;
2435 list_for_each_entry(hwid, &device->pnp.ids, list) {
2436 const struct acpi_device_id *devid;
2437 struct acpi_scan_handler *handler;
2439 handler = acpi_scan_match_handler(hwid->id, &devid);
2441 if (!handler->attach) {
2442 device->pnp.type.platform_id = 0;
2445 device->handler = handler;
2446 ret = handler->attach(device, devid);
2450 device->handler = NULL;
2459 static void acpi_bus_attach(struct acpi_device *device)
2461 struct acpi_device *child;
2465 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2466 register_dock_dependent_device(device, ejd);
2468 acpi_bus_get_status(device);
2469 /* Skip devices that are not present. */
2470 if (!acpi_device_is_present(device)) {
2471 device->flags.visited = false;
2472 device->flags.power_manageable = 0;
2475 if (device->handler)
2478 if (!device->flags.initialized) {
2479 device->flags.power_manageable =
2480 device->power.states[ACPI_STATE_D0].flags.valid;
2481 if (acpi_bus_init_power(device))
2482 device->flags.power_manageable = 0;
2484 device->flags.initialized = true;
2486 device->flags.visited = false;
2487 ret = acpi_scan_attach_handler(device);
2491 device->flags.match_driver = true;
2493 ret = device_attach(&device->dev);
2497 if (!ret && device->pnp.type.platform_id)
2498 acpi_default_enumeration(device);
2500 device->flags.visited = true;
2503 list_for_each_entry(child, &device->children, node)
2504 acpi_bus_attach(child);
2506 if (device->handler && device->handler->hotplug.notify_online)
2507 device->handler->hotplug.notify_online(device);
2510 void acpi_walk_dep_device_list(acpi_handle handle)
2512 struct acpi_dep_data *dep, *tmp;
2513 struct acpi_device *adev;
2515 mutex_lock(&acpi_dep_list_lock);
2516 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2517 if (dep->master == handle) {
2518 acpi_bus_get_device(dep->slave, &adev);
2523 if (!adev->dep_unmet)
2524 acpi_bus_attach(adev);
2525 list_del(&dep->node);
2529 mutex_unlock(&acpi_dep_list_lock);
2531 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
2534 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2535 * @handle: Root of the namespace scope to scan.
2537 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2540 * If no devices were found, -ENODEV is returned, but it does not mean that
2541 * there has been a real error. There just have been no suitable ACPI objects
2542 * in the table trunk from which the kernel could create a device and add an
2543 * appropriate driver.
2545 * Must be called under acpi_scan_lock.
2547 int acpi_bus_scan(acpi_handle handle)
2549 void *device = NULL;
2551 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2552 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2553 acpi_bus_check_add, NULL, NULL, &device);
2556 acpi_bus_attach(device);
2561 EXPORT_SYMBOL(acpi_bus_scan);
2564 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2565 * @adev: Root of the ACPI namespace scope to walk.
2567 * Must be called under acpi_scan_lock.
2569 void acpi_bus_trim(struct acpi_device *adev)
2571 struct acpi_scan_handler *handler = adev->handler;
2572 struct acpi_device *child;
2574 list_for_each_entry_reverse(child, &adev->children, node)
2575 acpi_bus_trim(child);
2577 adev->flags.match_driver = false;
2579 if (handler->detach)
2580 handler->detach(adev);
2582 adev->handler = NULL;
2584 device_release_driver(&adev->dev);
2587 * Most likely, the device is going away, so put it into D3cold before
2590 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2591 adev->flags.initialized = false;
2592 adev->flags.visited = false;
2594 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2596 static int acpi_bus_scan_fixed(void)
2601 * Enumerate all fixed-feature devices.
2603 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2604 struct acpi_device *device = NULL;
2606 result = acpi_add_single_object(&device, NULL,
2607 ACPI_BUS_TYPE_POWER_BUTTON,
2612 device->flags.match_driver = true;
2613 result = device_attach(&device->dev);
2617 device_init_wakeup(&device->dev, true);
2620 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2621 struct acpi_device *device = NULL;
2623 result = acpi_add_single_object(&device, NULL,
2624 ACPI_BUS_TYPE_SLEEP_BUTTON,
2629 device->flags.match_driver = true;
2630 result = device_attach(&device->dev);
2633 return result < 0 ? result : 0;
2636 int __init acpi_scan_init(void)
2640 result = bus_register(&acpi_bus_type);
2642 /* We don't want to quit even if we failed to add suspend/resume */
2643 printk(KERN_ERR PREFIX "Could not register bus type\n");
2646 acpi_pci_root_init();
2647 acpi_pci_link_init();
2648 acpi_processor_init();
2651 acpi_cmos_rtc_init();
2652 acpi_container_init();
2653 acpi_memory_hotplug_init();
2655 acpi_int340x_thermal_init();
2657 acpi_scan_add_handler(&generic_device_handler);
2659 mutex_lock(&acpi_scan_lock);
2661 * Enumerate devices in the ACPI namespace.
2663 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2667 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2671 /* Fixed feature devices do not exist on HW-reduced platform */
2672 if (!acpi_gbl_reduced_hardware) {
2673 result = acpi_bus_scan_fixed();
2675 acpi_detach_data(acpi_root->handle,
2676 acpi_scan_drop_device);
2677 acpi_device_del(acpi_root);
2678 put_device(&acpi_root->dev);
2683 acpi_update_all_gpes();
2686 mutex_unlock(&acpi_scan_lock);