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