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>
14 #include <linux/dma-mapping.h>
16 #include <asm/pgtable.h>
20 #define _COMPONENT ACPI_BUS_COMPONENT
21 ACPI_MODULE_NAME("scan");
22 extern struct acpi_device *acpi_root;
24 #define ACPI_BUS_CLASS "system_bus"
25 #define ACPI_BUS_HID "LNXSYBUS"
26 #define ACPI_BUS_DEVICE_NAME "System Bus"
28 #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
30 #define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page)
33 * If set, devices will be hot-removed even if they cannot be put offline
34 * gracefully (from the kernel's standpoint).
36 bool acpi_force_hot_remove;
38 static const char *dummy_hid = "device";
40 static LIST_HEAD(acpi_dep_list);
41 static DEFINE_MUTEX(acpi_dep_list_lock);
42 static LIST_HEAD(acpi_bus_id_list);
43 static DEFINE_MUTEX(acpi_scan_lock);
44 static LIST_HEAD(acpi_scan_handlers_list);
45 DEFINE_MUTEX(acpi_device_lock);
46 LIST_HEAD(acpi_wakeup_device_list);
47 static DEFINE_MUTEX(acpi_hp_context_lock);
49 struct acpi_dep_data {
50 struct list_head node;
55 struct acpi_device_bus_id{
57 unsigned int instance_no;
58 struct list_head node;
61 void acpi_scan_lock_acquire(void)
63 mutex_lock(&acpi_scan_lock);
65 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
67 void acpi_scan_lock_release(void)
69 mutex_unlock(&acpi_scan_lock);
71 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
73 void acpi_lock_hp_context(void)
75 mutex_lock(&acpi_hp_context_lock);
78 void acpi_unlock_hp_context(void)
80 mutex_unlock(&acpi_hp_context_lock);
83 void acpi_initialize_hp_context(struct acpi_device *adev,
84 struct acpi_hotplug_context *hp,
85 int (*notify)(struct acpi_device *, u32),
86 void (*uevent)(struct acpi_device *, u32))
88 acpi_lock_hp_context();
91 acpi_set_hp_context(adev, hp);
92 acpi_unlock_hp_context();
94 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
96 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
101 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
105 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
106 const char *hotplug_profile_name)
110 error = acpi_scan_add_handler(handler);
114 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
119 * create_pnp_modalias - Create hid/cid(s) string for modalias and uevent
120 * @acpi_dev: ACPI device object.
121 * @modalias: Buffer to print into.
122 * @size: Size of the buffer.
124 * Creates hid/cid(s) string needed for modalias and uevent
125 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
126 * char *modalias: "acpi:IBM0001:ACPI0001"
127 * Return: 0: no _HID and no _CID
128 * -EINVAL: output error
129 * -ENOMEM: output is truncated
131 static int create_pnp_modalias(struct acpi_device *acpi_dev, char *modalias,
136 struct acpi_hardware_id *id;
139 * Since we skip ACPI_DT_NAMESPACE_HID from the modalias below, 0 should
140 * be returned if ACPI_DT_NAMESPACE_HID is the only ACPI/PNP ID in the
144 list_for_each_entry(id, &acpi_dev->pnp.ids, list)
145 if (strcmp(id->id, ACPI_DT_NAMESPACE_HID))
151 len = snprintf(modalias, size, "acpi:");
157 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
158 if (!strcmp(id->id, ACPI_DT_NAMESPACE_HID))
161 count = snprintf(&modalias[len], size, "%s:", id->id);
171 modalias[len] = '\0';
176 * create_of_modalias - Creates DT compatible string for modalias and uevent
177 * @acpi_dev: ACPI device object.
178 * @modalias: Buffer to print into.
179 * @size: Size of the buffer.
181 * Expose DT compatible modalias as of:NnameTCcompatible. This function should
182 * only be called for devices having ACPI_DT_NAMESPACE_HID in their list of
185 static int create_of_modalias(struct acpi_device *acpi_dev, char *modalias,
188 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
189 const union acpi_object *of_compatible, *obj;
194 acpi_get_name(acpi_dev->handle, ACPI_SINGLE_NAME, &buf);
195 /* DT strings are all in lower case */
196 for (c = buf.pointer; *c != '\0'; c++)
199 len = snprintf(modalias, size, "of:N%sT", (char *)buf.pointer);
200 ACPI_FREE(buf.pointer);
205 of_compatible = acpi_dev->data.of_compatible;
206 if (of_compatible->type == ACPI_TYPE_PACKAGE) {
207 nval = of_compatible->package.count;
208 obj = of_compatible->package.elements;
209 } else { /* Must be ACPI_TYPE_STRING. */
213 for (i = 0; i < nval; i++, obj++) {
214 count = snprintf(&modalias[len], size, "C%s",
215 obj->string.pointer);
225 modalias[len] = '\0';
230 * acpi_companion_match() - Can we match via ACPI companion device
231 * @dev: Device in question
233 * Check if the given device has an ACPI companion and if that companion has
234 * a valid list of PNP IDs, and if the device is the first (primary) physical
235 * device associated with it. Return the companion pointer if that's the case
238 * If multiple physical devices are attached to a single ACPI companion, we need
239 * to be careful. The usage scenario for this kind of relationship is that all
240 * of the physical devices in question use resources provided by the ACPI
241 * companion. A typical case is an MFD device where all the sub-devices share
242 * the parent's ACPI companion. In such cases we can only allow the primary
243 * (first) physical device to be matched with the help of the companion's PNP
246 * Additional physical devices sharing the ACPI companion can still use
247 * resources available from it but they will be matched normally using functions
248 * provided by their bus types (and analogously for their modalias).
250 static struct acpi_device *acpi_companion_match(const struct device *dev)
252 struct acpi_device *adev;
253 struct mutex *physical_node_lock;
255 adev = ACPI_COMPANION(dev);
259 if (list_empty(&adev->pnp.ids))
262 physical_node_lock = &adev->physical_node_lock;
263 mutex_lock(physical_node_lock);
264 if (list_empty(&adev->physical_node_list)) {
267 const struct acpi_device_physical_node *node;
269 node = list_first_entry(&adev->physical_node_list,
270 struct acpi_device_physical_node, node);
271 if (node->dev != dev)
274 mutex_unlock(physical_node_lock);
279 static int __acpi_device_uevent_modalias(struct acpi_device *adev,
280 struct kobj_uevent_env *env)
287 if (list_empty(&adev->pnp.ids))
290 if (add_uevent_var(env, "MODALIAS="))
293 len = create_pnp_modalias(adev, &env->buf[env->buflen - 1],
294 sizeof(env->buf) - env->buflen);
299 if (!adev->data.of_compatible)
302 if (len > 0 && add_uevent_var(env, "MODALIAS="))
305 len = create_of_modalias(adev, &env->buf[env->buflen - 1],
306 sizeof(env->buf) - env->buflen);
316 * Creates uevent modalias field for ACPI enumerated devices.
317 * Because the other buses does not support ACPI HIDs & CIDs.
318 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
319 * "acpi:IBM0001:ACPI0001"
321 int acpi_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
323 return __acpi_device_uevent_modalias(acpi_companion_match(dev), env);
325 EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias);
327 static int __acpi_device_modalias(struct acpi_device *adev, char *buf, int size)
334 if (list_empty(&adev->pnp.ids))
337 len = create_pnp_modalias(adev, buf, size - 1);
340 } else if (len > 0) {
344 if (!adev->data.of_compatible)
347 count = create_of_modalias(adev, buf + len, size - 1);
350 } else if (count > 0) {
359 * Creates modalias sysfs attribute for ACPI enumerated devices.
360 * Because the other buses does not support ACPI HIDs & CIDs.
361 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
362 * "acpi:IBM0001:ACPI0001"
364 int acpi_device_modalias(struct device *dev, char *buf, int size)
366 return __acpi_device_modalias(acpi_companion_match(dev), buf, size);
368 EXPORT_SYMBOL_GPL(acpi_device_modalias);
371 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
372 return __acpi_device_modalias(to_acpi_device(dev), buf, 1024);
374 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
376 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
378 struct acpi_device_physical_node *pn;
382 * acpi_container_offline() calls this for all of the container's
383 * children under the container's physical_node_lock lock.
385 mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
387 list_for_each_entry(pn, &adev->physical_node_list, node)
388 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
390 kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
396 mutex_unlock(&adev->physical_node_lock);
400 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
403 struct acpi_device *device = NULL;
404 struct acpi_device_physical_node *pn;
405 bool second_pass = (bool)data;
406 acpi_status status = AE_OK;
408 if (acpi_bus_get_device(handle, &device))
411 if (device->handler && !device->handler->hotplug.enabled) {
412 *ret_p = &device->dev;
416 mutex_lock(&device->physical_node_lock);
418 list_for_each_entry(pn, &device->physical_node_list, node) {
422 /* Skip devices offlined by the first pass. */
426 pn->put_online = false;
428 ret = device_offline(pn->dev);
429 if (acpi_force_hot_remove)
433 pn->put_online = !ret;
443 mutex_unlock(&device->physical_node_lock);
448 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
451 struct acpi_device *device = NULL;
452 struct acpi_device_physical_node *pn;
454 if (acpi_bus_get_device(handle, &device))
457 mutex_lock(&device->physical_node_lock);
459 list_for_each_entry(pn, &device->physical_node_list, node)
460 if (pn->put_online) {
461 device_online(pn->dev);
462 pn->put_online = false;
465 mutex_unlock(&device->physical_node_lock);
470 static int acpi_scan_try_to_offline(struct acpi_device *device)
472 acpi_handle handle = device->handle;
473 struct device *errdev = NULL;
477 * Carry out two passes here and ignore errors in the first pass,
478 * because if the devices in question are memory blocks and
479 * CONFIG_MEMCG is set, one of the blocks may hold data structures
480 * that the other blocks depend on, but it is not known in advance which
483 * If the first pass is successful, the second one isn't needed, though.
485 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
486 NULL, acpi_bus_offline, (void *)false,
488 if (status == AE_SUPPORT) {
489 dev_warn(errdev, "Offline disabled.\n");
490 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
491 acpi_bus_online, NULL, NULL, NULL);
494 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
497 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
498 NULL, acpi_bus_offline, (void *)true,
500 if (!errdev || acpi_force_hot_remove)
501 acpi_bus_offline(handle, 0, (void *)true,
504 if (errdev && !acpi_force_hot_remove) {
505 dev_warn(errdev, "Offline failed.\n");
506 acpi_bus_online(handle, 0, NULL, NULL);
507 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
508 ACPI_UINT32_MAX, acpi_bus_online,
516 static int acpi_scan_hot_remove(struct acpi_device *device)
518 acpi_handle handle = device->handle;
519 unsigned long long sta;
522 if (device->handler && device->handler->hotplug.demand_offline
523 && !acpi_force_hot_remove) {
524 if (!acpi_scan_is_offline(device, true))
527 int error = acpi_scan_try_to_offline(device);
532 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
533 "Hot-removing device %s...\n", dev_name(&device->dev)));
535 acpi_bus_trim(device);
537 acpi_evaluate_lck(handle, 0);
541 status = acpi_evaluate_ej0(handle);
542 if (status == AE_NOT_FOUND)
544 else if (ACPI_FAILURE(status))
548 * Verify if eject was indeed successful. If not, log an error
549 * message. No need to call _OST since _EJ0 call was made OK.
551 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
552 if (ACPI_FAILURE(status)) {
553 acpi_handle_warn(handle,
554 "Status check after eject failed (0x%x)\n", status);
555 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
556 acpi_handle_warn(handle,
557 "Eject incomplete - status 0x%llx\n", sta);
563 static int acpi_scan_device_not_present(struct acpi_device *adev)
565 if (!acpi_device_enumerated(adev)) {
566 dev_warn(&adev->dev, "Still not present\n");
573 static int acpi_scan_device_check(struct acpi_device *adev)
577 acpi_bus_get_status(adev);
578 if (adev->status.present || adev->status.functional) {
580 * This function is only called for device objects for which
581 * matching scan handlers exist. The only situation in which
582 * the scan handler is not attached to this device object yet
583 * is when the device has just appeared (either it wasn't
584 * present at all before or it was removed and then added
588 dev_warn(&adev->dev, "Already enumerated\n");
591 error = acpi_bus_scan(adev->handle);
593 dev_warn(&adev->dev, "Namespace scan failure\n");
596 if (!adev->handler) {
597 dev_warn(&adev->dev, "Enumeration failure\n");
601 error = acpi_scan_device_not_present(adev);
606 static int acpi_scan_bus_check(struct acpi_device *adev)
608 struct acpi_scan_handler *handler = adev->handler;
609 struct acpi_device *child;
612 acpi_bus_get_status(adev);
613 if (!(adev->status.present || adev->status.functional)) {
614 acpi_scan_device_not_present(adev);
617 if (handler && handler->hotplug.scan_dependent)
618 return handler->hotplug.scan_dependent(adev);
620 error = acpi_bus_scan(adev->handle);
622 dev_warn(&adev->dev, "Namespace scan failure\n");
625 list_for_each_entry(child, &adev->children, node) {
626 error = acpi_scan_bus_check(child);
633 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
636 case ACPI_NOTIFY_BUS_CHECK:
637 return acpi_scan_bus_check(adev);
638 case ACPI_NOTIFY_DEVICE_CHECK:
639 return acpi_scan_device_check(adev);
640 case ACPI_NOTIFY_EJECT_REQUEST:
641 case ACPI_OST_EC_OSPM_EJECT:
642 if (adev->handler && !adev->handler->hotplug.enabled) {
643 dev_info(&adev->dev, "Eject disabled\n");
646 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
647 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
648 return acpi_scan_hot_remove(adev);
653 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
655 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
658 lock_device_hotplug();
659 mutex_lock(&acpi_scan_lock);
662 * The device object's ACPI handle cannot become invalid as long as we
663 * are holding acpi_scan_lock, but it might have become invalid before
664 * that lock was acquired.
666 if (adev->handle == INVALID_ACPI_HANDLE)
669 if (adev->flags.is_dock_station) {
670 error = dock_notify(adev, src);
671 } else if (adev->flags.hotplug_notify) {
672 error = acpi_generic_hotplug_event(adev, src);
673 if (error == -EPERM) {
674 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
678 int (*notify)(struct acpi_device *, u32);
680 acpi_lock_hp_context();
681 notify = adev->hp ? adev->hp->notify : NULL;
682 acpi_unlock_hp_context();
684 * There may be additional notify handlers for device objects
685 * without the .event() callback, so ignore them here.
688 error = notify(adev, src);
693 ost_code = ACPI_OST_SC_SUCCESS;
696 acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
699 acpi_bus_put_acpi_device(adev);
700 mutex_unlock(&acpi_scan_lock);
701 unlock_device_hotplug();
704 static ssize_t real_power_state_show(struct device *dev,
705 struct device_attribute *attr, char *buf)
707 struct acpi_device *adev = to_acpi_device(dev);
711 ret = acpi_device_get_power(adev, &state);
715 return sprintf(buf, "%s\n", acpi_power_state_string(state));
718 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
720 static ssize_t power_state_show(struct device *dev,
721 struct device_attribute *attr, char *buf)
723 struct acpi_device *adev = to_acpi_device(dev);
725 return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
728 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
731 acpi_eject_store(struct device *d, struct device_attribute *attr,
732 const char *buf, size_t count)
734 struct acpi_device *acpi_device = to_acpi_device(d);
735 acpi_object_type not_used;
738 if (!count || buf[0] != '1')
741 if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
742 && !acpi_device->driver)
745 status = acpi_get_type(acpi_device->handle, ¬_used);
746 if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
749 get_device(&acpi_device->dev);
750 status = acpi_hotplug_schedule(acpi_device, ACPI_OST_EC_OSPM_EJECT);
751 if (ACPI_SUCCESS(status))
754 put_device(&acpi_device->dev);
755 acpi_evaluate_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
756 ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
757 return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
760 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
763 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
764 struct acpi_device *acpi_dev = to_acpi_device(dev);
766 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
768 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
770 static ssize_t acpi_device_uid_show(struct device *dev,
771 struct device_attribute *attr, char *buf)
773 struct acpi_device *acpi_dev = to_acpi_device(dev);
775 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
777 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
779 static ssize_t acpi_device_adr_show(struct device *dev,
780 struct device_attribute *attr, char *buf)
782 struct acpi_device *acpi_dev = to_acpi_device(dev);
784 return sprintf(buf, "0x%08x\n",
785 (unsigned int)(acpi_dev->pnp.bus_address));
787 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
790 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
791 struct acpi_device *acpi_dev = to_acpi_device(dev);
792 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
795 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
799 result = sprintf(buf, "%s\n", (char*)path.pointer);
804 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
806 /* sysfs file that shows description text from the ACPI _STR method */
807 static ssize_t description_show(struct device *dev,
808 struct device_attribute *attr,
810 struct acpi_device *acpi_dev = to_acpi_device(dev);
813 if (acpi_dev->pnp.str_obj == NULL)
817 * The _STR object contains a Unicode identifier for a device.
818 * We need to convert to utf-8 so it can be displayed.
820 result = utf16s_to_utf8s(
821 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
822 acpi_dev->pnp.str_obj->buffer.length,
823 UTF16_LITTLE_ENDIAN, buf,
826 buf[result++] = '\n';
830 static DEVICE_ATTR(description, 0444, description_show, NULL);
833 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
835 struct acpi_device *acpi_dev = to_acpi_device(dev);
837 unsigned long long sun;
839 status = acpi_evaluate_integer(acpi_dev->handle, "_SUN", NULL, &sun);
840 if (ACPI_FAILURE(status))
843 return sprintf(buf, "%llu\n", sun);
845 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
847 static ssize_t status_show(struct device *dev, struct device_attribute *attr,
849 struct acpi_device *acpi_dev = to_acpi_device(dev);
851 unsigned long long sta;
853 status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta);
854 if (ACPI_FAILURE(status))
857 return sprintf(buf, "%llu\n", sta);
859 static DEVICE_ATTR_RO(status);
861 static int acpi_device_setup_files(struct acpi_device *dev)
863 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
868 * Devices gotten from FADT don't have a "path" attribute
871 result = device_create_file(&dev->dev, &dev_attr_path);
876 if (!list_empty(&dev->pnp.ids)) {
877 result = device_create_file(&dev->dev, &dev_attr_hid);
881 result = device_create_file(&dev->dev, &dev_attr_modalias);
887 * If device has _STR, 'description' file is created
889 if (acpi_has_method(dev->handle, "_STR")) {
890 status = acpi_evaluate_object(dev->handle, "_STR",
892 if (ACPI_FAILURE(status))
893 buffer.pointer = NULL;
894 dev->pnp.str_obj = buffer.pointer;
895 result = device_create_file(&dev->dev, &dev_attr_description);
900 if (dev->pnp.type.bus_address)
901 result = device_create_file(&dev->dev, &dev_attr_adr);
902 if (dev->pnp.unique_id)
903 result = device_create_file(&dev->dev, &dev_attr_uid);
905 if (acpi_has_method(dev->handle, "_SUN")) {
906 result = device_create_file(&dev->dev, &dev_attr_sun);
911 if (acpi_has_method(dev->handle, "_STA")) {
912 result = device_create_file(&dev->dev, &dev_attr_status);
918 * If device has _EJ0, 'eject' file is created that is used to trigger
919 * hot-removal function from userland.
921 if (acpi_has_method(dev->handle, "_EJ0")) {
922 result = device_create_file(&dev->dev, &dev_attr_eject);
927 if (dev->flags.power_manageable) {
928 result = device_create_file(&dev->dev, &dev_attr_power_state);
932 if (dev->power.flags.power_resources)
933 result = device_create_file(&dev->dev,
934 &dev_attr_real_power_state);
941 static void acpi_device_remove_files(struct acpi_device *dev)
943 if (dev->flags.power_manageable) {
944 device_remove_file(&dev->dev, &dev_attr_power_state);
945 if (dev->power.flags.power_resources)
946 device_remove_file(&dev->dev,
947 &dev_attr_real_power_state);
951 * If device has _STR, remove 'description' file
953 if (acpi_has_method(dev->handle, "_STR")) {
954 kfree(dev->pnp.str_obj);
955 device_remove_file(&dev->dev, &dev_attr_description);
958 * If device has _EJ0, remove 'eject' file.
960 if (acpi_has_method(dev->handle, "_EJ0"))
961 device_remove_file(&dev->dev, &dev_attr_eject);
963 if (acpi_has_method(dev->handle, "_SUN"))
964 device_remove_file(&dev->dev, &dev_attr_sun);
966 if (dev->pnp.unique_id)
967 device_remove_file(&dev->dev, &dev_attr_uid);
968 if (dev->pnp.type.bus_address)
969 device_remove_file(&dev->dev, &dev_attr_adr);
970 device_remove_file(&dev->dev, &dev_attr_modalias);
971 device_remove_file(&dev->dev, &dev_attr_hid);
972 if (acpi_has_method(dev->handle, "_STA"))
973 device_remove_file(&dev->dev, &dev_attr_status);
975 device_remove_file(&dev->dev, &dev_attr_path);
977 /* --------------------------------------------------------------------------
979 -------------------------------------------------------------------------- */
982 * acpi_of_match_device - Match device object using the "compatible" property.
983 * @adev: ACPI device object to match.
984 * @of_match_table: List of device IDs to match against.
986 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
987 * identifiers and a _DSD object with the "compatible" property, use that
988 * property to match against the given list of identifiers.
990 static bool acpi_of_match_device(struct acpi_device *adev,
991 const struct of_device_id *of_match_table)
993 const union acpi_object *of_compatible, *obj;
999 of_compatible = adev->data.of_compatible;
1000 if (!of_match_table || !of_compatible)
1003 if (of_compatible->type == ACPI_TYPE_PACKAGE) {
1004 nval = of_compatible->package.count;
1005 obj = of_compatible->package.elements;
1006 } else { /* Must be ACPI_TYPE_STRING. */
1008 obj = of_compatible;
1010 /* Now we can look for the driver DT compatible strings */
1011 for (i = 0; i < nval; i++, obj++) {
1012 const struct of_device_id *id;
1014 for (id = of_match_table; id->compatible[0]; id++)
1015 if (!strcasecmp(obj->string.pointer, id->compatible))
1022 static const struct acpi_device_id *__acpi_match_device(
1023 struct acpi_device *device,
1024 const struct acpi_device_id *ids,
1025 const struct of_device_id *of_ids)
1027 const struct acpi_device_id *id;
1028 struct acpi_hardware_id *hwid;
1031 * If the device is not present, it is unnecessary to load device
1034 if (!device || !device->status.present)
1037 list_for_each_entry(hwid, &device->pnp.ids, list) {
1038 /* First, check the ACPI/PNP IDs provided by the caller. */
1039 for (id = ids; id->id[0]; id++)
1040 if (!strcmp((char *) id->id, hwid->id))
1044 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
1045 * "compatible" property if found.
1047 * The id returned by the below is not valid, but the only
1048 * caller passing non-NULL of_ids here is only interested in
1049 * whether or not the return value is NULL.
1051 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)
1052 && acpi_of_match_device(device, of_ids))
1059 * acpi_match_device - Match a struct device against a given list of ACPI IDs
1060 * @ids: Array of struct acpi_device_id object to match against.
1061 * @dev: The device structure to match.
1063 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
1064 * object for that handle and use that object to match against a given list of
1067 * Return a pointer to the first matching ID on success or %NULL on failure.
1069 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
1070 const struct device *dev)
1072 return __acpi_match_device(acpi_companion_match(dev), ids, NULL);
1074 EXPORT_SYMBOL_GPL(acpi_match_device);
1076 int acpi_match_device_ids(struct acpi_device *device,
1077 const struct acpi_device_id *ids)
1079 return __acpi_match_device(device, ids, NULL) ? 0 : -ENOENT;
1081 EXPORT_SYMBOL(acpi_match_device_ids);
1083 bool acpi_driver_match_device(struct device *dev,
1084 const struct device_driver *drv)
1086 if (!drv->acpi_match_table)
1087 return acpi_of_match_device(ACPI_COMPANION(dev),
1088 drv->of_match_table);
1090 return !!__acpi_match_device(acpi_companion_match(dev),
1091 drv->acpi_match_table, drv->of_match_table);
1093 EXPORT_SYMBOL_GPL(acpi_driver_match_device);
1095 static void acpi_free_power_resources_lists(struct acpi_device *device)
1099 if (device->wakeup.flags.valid)
1100 acpi_power_resources_list_free(&device->wakeup.resources);
1102 if (!device->power.flags.power_resources)
1105 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
1106 struct acpi_device_power_state *ps = &device->power.states[i];
1107 acpi_power_resources_list_free(&ps->resources);
1111 static void acpi_device_release(struct device *dev)
1113 struct acpi_device *acpi_dev = to_acpi_device(dev);
1115 acpi_free_properties(acpi_dev);
1116 acpi_free_pnp_ids(&acpi_dev->pnp);
1117 acpi_free_power_resources_lists(acpi_dev);
1121 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
1123 struct acpi_device *acpi_dev = to_acpi_device(dev);
1124 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
1126 return acpi_dev->flags.match_driver
1127 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
1130 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
1132 return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
1135 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
1137 struct acpi_device *device = data;
1139 device->driver->ops.notify(device, event);
1142 static void acpi_device_notify_fixed(void *data)
1144 struct acpi_device *device = data;
1146 /* Fixed hardware devices have no handles */
1147 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
1150 static u32 acpi_device_fixed_event(void *data)
1152 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
1153 return ACPI_INTERRUPT_HANDLED;
1156 static int acpi_device_install_notify_handler(struct acpi_device *device)
1160 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
1162 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
1163 acpi_device_fixed_event,
1165 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
1167 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
1168 acpi_device_fixed_event,
1171 status = acpi_install_notify_handler(device->handle,
1176 if (ACPI_FAILURE(status))
1181 static void acpi_device_remove_notify_handler(struct acpi_device *device)
1183 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
1184 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
1185 acpi_device_fixed_event);
1186 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
1187 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
1188 acpi_device_fixed_event);
1190 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
1191 acpi_device_notify);
1194 static int acpi_device_probe(struct device *dev)
1196 struct acpi_device *acpi_dev = to_acpi_device(dev);
1197 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1200 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
1203 if (!acpi_drv->ops.add)
1206 ret = acpi_drv->ops.add(acpi_dev);
1210 acpi_dev->driver = acpi_drv;
1211 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1212 "Driver [%s] successfully bound to device [%s]\n",
1213 acpi_drv->name, acpi_dev->pnp.bus_id));
1215 if (acpi_drv->ops.notify) {
1216 ret = acpi_device_install_notify_handler(acpi_dev);
1218 if (acpi_drv->ops.remove)
1219 acpi_drv->ops.remove(acpi_dev);
1221 acpi_dev->driver = NULL;
1222 acpi_dev->driver_data = NULL;
1227 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
1228 acpi_drv->name, acpi_dev->pnp.bus_id));
1233 static int acpi_device_remove(struct device * dev)
1235 struct acpi_device *acpi_dev = to_acpi_device(dev);
1236 struct acpi_driver *acpi_drv = acpi_dev->driver;
1239 if (acpi_drv->ops.notify)
1240 acpi_device_remove_notify_handler(acpi_dev);
1241 if (acpi_drv->ops.remove)
1242 acpi_drv->ops.remove(acpi_dev);
1244 acpi_dev->driver = NULL;
1245 acpi_dev->driver_data = NULL;
1251 struct bus_type acpi_bus_type = {
1253 .match = acpi_bus_match,
1254 .probe = acpi_device_probe,
1255 .remove = acpi_device_remove,
1256 .uevent = acpi_device_uevent,
1259 static void acpi_device_del(struct acpi_device *device)
1261 mutex_lock(&acpi_device_lock);
1263 list_del(&device->node);
1265 list_del(&device->wakeup_list);
1266 mutex_unlock(&acpi_device_lock);
1268 acpi_power_add_remove_device(device, false);
1269 acpi_device_remove_files(device);
1271 device->remove(device);
1273 device_del(&device->dev);
1276 static LIST_HEAD(acpi_device_del_list);
1277 static DEFINE_MUTEX(acpi_device_del_lock);
1279 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
1282 struct acpi_device *adev;
1284 mutex_lock(&acpi_device_del_lock);
1286 if (list_empty(&acpi_device_del_list)) {
1287 mutex_unlock(&acpi_device_del_lock);
1290 adev = list_first_entry(&acpi_device_del_list,
1291 struct acpi_device, del_list);
1292 list_del(&adev->del_list);
1294 mutex_unlock(&acpi_device_del_lock);
1296 acpi_device_del(adev);
1298 * Drop references to all power resources that might have been
1299 * used by the device.
1301 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
1302 put_device(&adev->dev);
1307 * acpi_scan_drop_device - Drop an ACPI device object.
1308 * @handle: Handle of an ACPI namespace node, not used.
1309 * @context: Address of the ACPI device object to drop.
1311 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
1312 * namespace node the device object pointed to by @context is attached to.
1314 * The unregistration is carried out asynchronously to avoid running
1315 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
1316 * ensure the correct ordering (the device objects must be unregistered in the
1317 * same order in which the corresponding namespace nodes are deleted).
1319 static void acpi_scan_drop_device(acpi_handle handle, void *context)
1321 static DECLARE_WORK(work, acpi_device_del_work_fn);
1322 struct acpi_device *adev = context;
1324 mutex_lock(&acpi_device_del_lock);
1327 * Use the ACPI hotplug workqueue which is ordered, so this work item
1328 * won't run after any hotplug work items submitted subsequently. That
1329 * prevents attempts to register device objects identical to those being
1330 * deleted from happening concurrently (such attempts result from
1331 * hotplug events handled via the ACPI hotplug workqueue). It also will
1332 * run after all of the work items submitted previosuly, which helps
1333 * those work items to ensure that they are not accessing stale device
1336 if (list_empty(&acpi_device_del_list))
1337 acpi_queue_hotplug_work(&work);
1339 list_add_tail(&adev->del_list, &acpi_device_del_list);
1340 /* Make acpi_ns_validate_handle() return NULL for this handle. */
1341 adev->handle = INVALID_ACPI_HANDLE;
1343 mutex_unlock(&acpi_device_del_lock);
1346 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
1347 void (*callback)(void *))
1354 status = acpi_get_data_full(handle, acpi_scan_drop_device,
1355 (void **)device, callback);
1356 if (ACPI_FAILURE(status) || !*device) {
1357 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
1364 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
1366 return acpi_get_device_data(handle, device, NULL);
1368 EXPORT_SYMBOL(acpi_bus_get_device);
1370 static void get_acpi_device(void *dev)
1373 get_device(&((struct acpi_device *)dev)->dev);
1376 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
1378 struct acpi_device *adev = NULL;
1380 acpi_get_device_data(handle, &adev, get_acpi_device);
1384 void acpi_bus_put_acpi_device(struct acpi_device *adev)
1386 put_device(&adev->dev);
1389 int acpi_device_add(struct acpi_device *device,
1390 void (*release)(struct device *))
1393 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
1396 if (device->handle) {
1399 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
1401 if (ACPI_FAILURE(status)) {
1402 acpi_handle_err(device->handle,
1403 "Unable to attach device data\n");
1411 * Link this device to its parent and siblings.
1413 INIT_LIST_HEAD(&device->children);
1414 INIT_LIST_HEAD(&device->node);
1415 INIT_LIST_HEAD(&device->wakeup_list);
1416 INIT_LIST_HEAD(&device->physical_node_list);
1417 INIT_LIST_HEAD(&device->del_list);
1418 mutex_init(&device->physical_node_lock);
1420 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
1422 pr_err(PREFIX "Memory allocation error\n");
1427 mutex_lock(&acpi_device_lock);
1429 * Find suitable bus_id and instance number in acpi_bus_id_list
1430 * If failed, create one and link it into acpi_bus_id_list
1432 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1433 if (!strcmp(acpi_device_bus_id->bus_id,
1434 acpi_device_hid(device))) {
1435 acpi_device_bus_id->instance_no++;
1442 acpi_device_bus_id = new_bus_id;
1443 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1444 acpi_device_bus_id->instance_no = 0;
1445 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1447 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1450 list_add_tail(&device->node, &device->parent->children);
1452 if (device->wakeup.flags.valid)
1453 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1454 mutex_unlock(&acpi_device_lock);
1457 device->dev.parent = &device->parent->dev;
1458 device->dev.bus = &acpi_bus_type;
1459 device->dev.release = release;
1460 result = device_add(&device->dev);
1462 dev_err(&device->dev, "Error registering device\n");
1466 result = acpi_device_setup_files(device);
1468 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1469 dev_name(&device->dev));
1474 mutex_lock(&acpi_device_lock);
1476 list_del(&device->node);
1477 list_del(&device->wakeup_list);
1478 mutex_unlock(&acpi_device_lock);
1481 acpi_detach_data(device->handle, acpi_scan_drop_device);
1485 struct acpi_device *acpi_get_next_child(struct device *dev,
1486 struct acpi_device *child)
1488 struct acpi_device *adev = ACPI_COMPANION(dev);
1489 struct list_head *head, *next;
1494 head = &adev->children;
1495 if (list_empty(head))
1499 return list_first_entry(head, struct acpi_device, node);
1501 next = child->node.next;
1502 return next == head ? NULL : list_entry(next, struct acpi_device, node);
1505 /* --------------------------------------------------------------------------
1507 -------------------------------------------------------------------------- */
1509 * acpi_bus_register_driver - register a driver with the ACPI bus
1510 * @driver: driver being registered
1512 * Registers a driver with the ACPI bus. Searches the namespace for all
1513 * devices that match the driver's criteria and binds. Returns zero for
1514 * success or a negative error status for failure.
1516 int acpi_bus_register_driver(struct acpi_driver *driver)
1522 driver->drv.name = driver->name;
1523 driver->drv.bus = &acpi_bus_type;
1524 driver->drv.owner = driver->owner;
1526 ret = driver_register(&driver->drv);
1530 EXPORT_SYMBOL(acpi_bus_register_driver);
1533 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1534 * @driver: driver to unregister
1536 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1537 * devices that match the driver's criteria and unbinds.
1539 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1541 driver_unregister(&driver->drv);
1544 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1546 /* --------------------------------------------------------------------------
1548 -------------------------------------------------------------------------- */
1549 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1551 struct acpi_device *device = NULL;
1555 * Fixed hardware devices do not appear in the namespace and do not
1556 * have handles, but we fabricate acpi_devices for them, so we have
1557 * to deal with them specially.
1563 status = acpi_get_parent(handle, &handle);
1564 if (ACPI_FAILURE(status))
1565 return status == AE_NULL_ENTRY ? NULL : acpi_root;
1566 } while (acpi_bus_get_device(handle, &device));
1571 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1575 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1576 union acpi_object *obj;
1578 status = acpi_get_handle(handle, "_EJD", &tmp);
1579 if (ACPI_FAILURE(status))
1582 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1583 if (ACPI_SUCCESS(status)) {
1584 obj = buffer.pointer;
1585 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1587 kfree(buffer.pointer);
1591 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1593 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1594 struct acpi_device_wakeup *wakeup)
1596 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1597 union acpi_object *package = NULL;
1598 union acpi_object *element = NULL;
1605 INIT_LIST_HEAD(&wakeup->resources);
1608 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1609 if (ACPI_FAILURE(status)) {
1610 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1614 package = (union acpi_object *)buffer.pointer;
1616 if (!package || package->package.count < 2)
1619 element = &(package->package.elements[0]);
1623 if (element->type == ACPI_TYPE_PACKAGE) {
1624 if ((element->package.count < 2) ||
1625 (element->package.elements[0].type !=
1626 ACPI_TYPE_LOCAL_REFERENCE)
1627 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1630 wakeup->gpe_device =
1631 element->package.elements[0].reference.handle;
1632 wakeup->gpe_number =
1633 (u32) element->package.elements[1].integer.value;
1634 } else if (element->type == ACPI_TYPE_INTEGER) {
1635 wakeup->gpe_device = NULL;
1636 wakeup->gpe_number = element->integer.value;
1641 element = &(package->package.elements[1]);
1642 if (element->type != ACPI_TYPE_INTEGER)
1645 wakeup->sleep_state = element->integer.value;
1647 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1651 if (!list_empty(&wakeup->resources)) {
1654 err = acpi_power_wakeup_list_init(&wakeup->resources,
1657 acpi_handle_warn(handle, "Retrieving current states "
1658 "of wakeup power resources failed\n");
1659 acpi_power_resources_list_free(&wakeup->resources);
1662 if (sleep_state < wakeup->sleep_state) {
1663 acpi_handle_warn(handle, "Overriding _PRW sleep state "
1664 "(S%d) by S%d from power resources\n",
1665 (int)wakeup->sleep_state, sleep_state);
1666 wakeup->sleep_state = sleep_state;
1671 kfree(buffer.pointer);
1675 static void acpi_wakeup_gpe_init(struct acpi_device *device)
1677 static const struct acpi_device_id button_device_ids[] = {
1683 struct acpi_device_wakeup *wakeup = &device->wakeup;
1685 acpi_event_status event_status;
1687 wakeup->flags.notifier_present = 0;
1689 /* Power button, Lid switch always enable wakeup */
1690 if (!acpi_match_device_ids(device, button_device_ids)) {
1691 wakeup->flags.run_wake = 1;
1692 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1693 /* Do not use Lid/sleep button for S5 wakeup */
1694 if (wakeup->sleep_state == ACPI_STATE_S5)
1695 wakeup->sleep_state = ACPI_STATE_S4;
1697 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
1698 device_set_wakeup_capable(&device->dev, true);
1702 acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
1703 wakeup->gpe_number);
1704 status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number,
1706 if (ACPI_FAILURE(status))
1709 wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HAS_HANDLER);
1712 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1716 /* Presence of _PRW indicates wake capable */
1717 if (!acpi_has_method(device->handle, "_PRW"))
1720 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1723 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1727 device->wakeup.flags.valid = 1;
1728 device->wakeup.prepare_count = 0;
1729 acpi_wakeup_gpe_init(device);
1730 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1731 * system for the ACPI device with the _PRW object.
1732 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1733 * So it is necessary to call _DSW object first. Only when it is not
1734 * present will the _PSW object used.
1736 err = acpi_device_sleep_wake(device, 0, 0, 0);
1738 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1739 "error in _DSW or _PSW evaluation\n"));
1742 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1744 struct acpi_device_power_state *ps = &device->power.states[state];
1745 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1746 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1749 INIT_LIST_HEAD(&ps->resources);
1751 /* Evaluate "_PRx" to get referenced power resources */
1752 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1753 if (ACPI_SUCCESS(status)) {
1754 union acpi_object *package = buffer.pointer;
1756 if (buffer.length && package
1757 && package->type == ACPI_TYPE_PACKAGE
1758 && package->package.count) {
1759 int err = acpi_extract_power_resources(package, 0,
1762 device->power.flags.power_resources = 1;
1764 ACPI_FREE(buffer.pointer);
1767 /* Evaluate "_PSx" to see if we can do explicit sets */
1769 if (acpi_has_method(device->handle, pathname))
1770 ps->flags.explicit_set = 1;
1772 /* State is valid if there are means to put the device into it. */
1773 if (!list_empty(&ps->resources) || ps->flags.explicit_set)
1774 ps->flags.valid = 1;
1776 ps->power = -1; /* Unknown - driver assigned */
1777 ps->latency = -1; /* Unknown - driver assigned */
1780 static void acpi_bus_get_power_flags(struct acpi_device *device)
1784 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1785 if (!acpi_has_method(device->handle, "_PS0") &&
1786 !acpi_has_method(device->handle, "_PR0"))
1789 device->flags.power_manageable = 1;
1792 * Power Management Flags
1794 if (acpi_has_method(device->handle, "_PSC"))
1795 device->power.flags.explicit_get = 1;
1797 if (acpi_has_method(device->handle, "_IRC"))
1798 device->power.flags.inrush_current = 1;
1800 if (acpi_has_method(device->handle, "_DSW"))
1801 device->power.flags.dsw_present = 1;
1804 * Enumerate supported power management states
1806 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1807 acpi_bus_init_power_state(device, i);
1809 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1810 if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
1811 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1813 /* Set defaults for D0 and D3hot states (always valid) */
1814 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1815 device->power.states[ACPI_STATE_D0].power = 100;
1816 device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
1818 if (acpi_bus_init_power(device))
1819 device->flags.power_manageable = 0;
1822 static void acpi_bus_get_flags(struct acpi_device *device)
1824 /* Presence of _STA indicates 'dynamic_status' */
1825 if (acpi_has_method(device->handle, "_STA"))
1826 device->flags.dynamic_status = 1;
1828 /* Presence of _RMV indicates 'removable' */
1829 if (acpi_has_method(device->handle, "_RMV"))
1830 device->flags.removable = 1;
1832 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1833 if (acpi_has_method(device->handle, "_EJD") ||
1834 acpi_has_method(device->handle, "_EJ0"))
1835 device->flags.ejectable = 1;
1838 static void acpi_device_get_busid(struct acpi_device *device)
1840 char bus_id[5] = { '?', 0 };
1841 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1847 * The device's Bus ID is simply the object name.
1848 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1850 if (ACPI_IS_ROOT_DEVICE(device)) {
1851 strcpy(device->pnp.bus_id, "ACPI");
1855 switch (device->device_type) {
1856 case ACPI_BUS_TYPE_POWER_BUTTON:
1857 strcpy(device->pnp.bus_id, "PWRF");
1859 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1860 strcpy(device->pnp.bus_id, "SLPF");
1863 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1864 /* Clean up trailing underscores (if any) */
1865 for (i = 3; i > 1; i--) {
1866 if (bus_id[i] == '_')
1871 strcpy(device->pnp.bus_id, bus_id);
1877 * acpi_ata_match - see if an acpi object is an ATA device
1879 * If an acpi object has one of the ACPI ATA methods defined,
1880 * then we can safely call it an ATA device.
1882 bool acpi_ata_match(acpi_handle handle)
1884 return acpi_has_method(handle, "_GTF") ||
1885 acpi_has_method(handle, "_GTM") ||
1886 acpi_has_method(handle, "_STM") ||
1887 acpi_has_method(handle, "_SDD");
1891 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1893 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1894 * then we can safely call it an ejectable drive bay
1896 bool acpi_bay_match(acpi_handle handle)
1898 acpi_handle phandle;
1900 if (!acpi_has_method(handle, "_EJ0"))
1902 if (acpi_ata_match(handle))
1904 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1907 return acpi_ata_match(phandle);
1910 bool acpi_device_is_battery(struct acpi_device *adev)
1912 struct acpi_hardware_id *hwid;
1914 list_for_each_entry(hwid, &adev->pnp.ids, list)
1915 if (!strcmp("PNP0C0A", hwid->id))
1921 static bool is_ejectable_bay(struct acpi_device *adev)
1923 acpi_handle handle = adev->handle;
1925 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1928 return acpi_bay_match(handle);
1932 * acpi_dock_match - see if an acpi object has a _DCK method
1934 bool acpi_dock_match(acpi_handle handle)
1936 return acpi_has_method(handle, "_DCK");
1940 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
1941 void **return_value)
1943 long *cap = context;
1945 if (acpi_has_method(handle, "_BCM") &&
1946 acpi_has_method(handle, "_BCL")) {
1947 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
1949 *cap |= ACPI_VIDEO_BACKLIGHT;
1950 if (!acpi_has_method(handle, "_BQC"))
1951 printk(KERN_WARNING FW_BUG PREFIX "No _BQC method, "
1952 "cannot determine initial brightness\n");
1953 /* We have backlight support, no need to scan further */
1954 return AE_CTRL_TERMINATE;
1959 /* Returns true if the ACPI object is a video device which can be
1960 * handled by video.ko.
1961 * The device will get a Linux specific CID added in scan.c to
1962 * identify the device as an ACPI graphics device
1963 * Be aware that the graphics device may not be physically present
1964 * Use acpi_video_get_capabilities() to detect general ACPI video
1965 * capabilities of present cards
1967 long acpi_is_video_device(acpi_handle handle)
1969 long video_caps = 0;
1971 /* Is this device able to support video switching ? */
1972 if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
1973 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
1975 /* Is this device able to retrieve a video ROM ? */
1976 if (acpi_has_method(handle, "_ROM"))
1977 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
1979 /* Is this device able to configure which video head to be POSTed ? */
1980 if (acpi_has_method(handle, "_VPO") &&
1981 acpi_has_method(handle, "_GPD") &&
1982 acpi_has_method(handle, "_SPD"))
1983 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
1985 /* Only check for backlight functionality if one of the above hit. */
1987 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1988 ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
1993 EXPORT_SYMBOL(acpi_is_video_device);
1995 const char *acpi_device_hid(struct acpi_device *device)
1997 struct acpi_hardware_id *hid;
1999 if (list_empty(&device->pnp.ids))
2002 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
2005 EXPORT_SYMBOL(acpi_device_hid);
2007 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
2009 struct acpi_hardware_id *id;
2011 id = kmalloc(sizeof(*id), GFP_KERNEL);
2015 id->id = kstrdup(dev_id, GFP_KERNEL);
2021 list_add_tail(&id->list, &pnp->ids);
2022 pnp->type.hardware_id = 1;
2026 * Old IBM workstations have a DSDT bug wherein the SMBus object
2027 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
2028 * prefix. Work around this.
2030 static bool acpi_ibm_smbus_match(acpi_handle handle)
2032 char node_name[ACPI_PATH_SEGMENT_LENGTH];
2033 struct acpi_buffer path = { sizeof(node_name), node_name };
2035 if (!dmi_name_in_vendors("IBM"))
2038 /* Look for SMBS object */
2039 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
2040 strcmp("SMBS", path.pointer))
2043 /* Does it have the necessary (but misnamed) methods? */
2044 if (acpi_has_method(handle, "SBI") &&
2045 acpi_has_method(handle, "SBR") &&
2046 acpi_has_method(handle, "SBW"))
2052 static bool acpi_object_is_system_bus(acpi_handle handle)
2056 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
2059 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
2066 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
2070 struct acpi_device_info *info;
2071 struct acpi_pnp_device_id_list *cid_list;
2074 switch (device_type) {
2075 case ACPI_BUS_TYPE_DEVICE:
2076 if (handle == ACPI_ROOT_OBJECT) {
2077 acpi_add_id(pnp, ACPI_SYSTEM_HID);
2081 status = acpi_get_object_info(handle, &info);
2082 if (ACPI_FAILURE(status)) {
2083 pr_err(PREFIX "%s: Error reading device info\n",
2088 if (info->valid & ACPI_VALID_HID) {
2089 acpi_add_id(pnp, info->hardware_id.string);
2090 pnp->type.platform_id = 1;
2092 if (info->valid & ACPI_VALID_CID) {
2093 cid_list = &info->compatible_id_list;
2094 for (i = 0; i < cid_list->count; i++)
2095 acpi_add_id(pnp, cid_list->ids[i].string);
2097 if (info->valid & ACPI_VALID_ADR) {
2098 pnp->bus_address = info->address;
2099 pnp->type.bus_address = 1;
2101 if (info->valid & ACPI_VALID_UID)
2102 pnp->unique_id = kstrdup(info->unique_id.string,
2108 * Some devices don't reliably have _HIDs & _CIDs, so add
2109 * synthetic HIDs to make sure drivers can find them.
2111 if (acpi_is_video_device(handle))
2112 acpi_add_id(pnp, ACPI_VIDEO_HID);
2113 else if (acpi_bay_match(handle))
2114 acpi_add_id(pnp, ACPI_BAY_HID);
2115 else if (acpi_dock_match(handle))
2116 acpi_add_id(pnp, ACPI_DOCK_HID);
2117 else if (acpi_ibm_smbus_match(handle))
2118 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
2119 else if (list_empty(&pnp->ids) &&
2120 acpi_object_is_system_bus(handle)) {
2121 /* \_SB, \_TZ, LNXSYBUS */
2122 acpi_add_id(pnp, ACPI_BUS_HID);
2123 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
2124 strcpy(pnp->device_class, ACPI_BUS_CLASS);
2128 case ACPI_BUS_TYPE_POWER:
2129 acpi_add_id(pnp, ACPI_POWER_HID);
2131 case ACPI_BUS_TYPE_PROCESSOR:
2132 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
2134 case ACPI_BUS_TYPE_THERMAL:
2135 acpi_add_id(pnp, ACPI_THERMAL_HID);
2137 case ACPI_BUS_TYPE_POWER_BUTTON:
2138 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
2140 case ACPI_BUS_TYPE_SLEEP_BUTTON:
2141 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
2146 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
2148 struct acpi_hardware_id *id, *tmp;
2150 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
2154 kfree(pnp->unique_id);
2157 static void acpi_init_coherency(struct acpi_device *adev)
2159 unsigned long long cca = 0;
2161 struct acpi_device *parent = adev->parent;
2163 if (parent && parent->flags.cca_seen) {
2165 * From ACPI spec, OSPM will ignore _CCA if an ancestor
2168 adev->flags.cca_seen = 1;
2169 cca = parent->flags.coherent_dma;
2171 status = acpi_evaluate_integer(adev->handle, "_CCA",
2173 if (ACPI_SUCCESS(status))
2174 adev->flags.cca_seen = 1;
2175 else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
2177 * If architecture does not specify that _CCA is
2178 * required for DMA-able devices (e.g. x86),
2179 * we default to _CCA=1.
2183 acpi_handle_debug(adev->handle,
2184 "ACPI device is missing _CCA.\n");
2187 adev->flags.coherent_dma = cca;
2190 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
2191 int type, unsigned long long sta)
2193 INIT_LIST_HEAD(&device->pnp.ids);
2194 device->device_type = type;
2195 device->handle = handle;
2196 device->parent = acpi_bus_get_parent(handle);
2197 device->fwnode.type = FWNODE_ACPI;
2198 acpi_set_device_status(device, sta);
2199 acpi_device_get_busid(device);
2200 acpi_set_pnp_ids(handle, &device->pnp, type);
2201 acpi_init_properties(device);
2202 acpi_bus_get_flags(device);
2203 device->flags.match_driver = false;
2204 device->flags.initialized = true;
2205 device->flags.visited = false;
2206 device_initialize(&device->dev);
2207 dev_set_uevent_suppress(&device->dev, true);
2208 acpi_init_coherency(device);
2211 void acpi_device_add_finalize(struct acpi_device *device)
2213 dev_set_uevent_suppress(&device->dev, false);
2214 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
2217 static int acpi_add_single_object(struct acpi_device **child,
2218 acpi_handle handle, int type,
2219 unsigned long long sta)
2222 struct acpi_device *device;
2223 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
2225 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
2227 printk(KERN_ERR PREFIX "Memory allocation error\n");
2231 acpi_init_device_object(device, handle, type, sta);
2232 acpi_bus_get_power_flags(device);
2233 acpi_bus_get_wakeup_device_flags(device);
2235 result = acpi_device_add(device, acpi_device_release);
2237 acpi_device_release(&device->dev);
2241 acpi_power_add_remove_device(device, true);
2242 acpi_device_add_finalize(device);
2243 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
2244 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
2245 dev_name(&device->dev), (char *) buffer.pointer,
2246 device->parent ? dev_name(&device->parent->dev) : "(null)"));
2247 kfree(buffer.pointer);
2252 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
2253 unsigned long long *sta)
2256 acpi_object_type acpi_type;
2258 status = acpi_get_type(handle, &acpi_type);
2259 if (ACPI_FAILURE(status))
2262 switch (acpi_type) {
2263 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
2264 case ACPI_TYPE_DEVICE:
2265 *type = ACPI_BUS_TYPE_DEVICE;
2266 status = acpi_bus_get_status_handle(handle, sta);
2267 if (ACPI_FAILURE(status))
2270 case ACPI_TYPE_PROCESSOR:
2271 *type = ACPI_BUS_TYPE_PROCESSOR;
2272 status = acpi_bus_get_status_handle(handle, sta);
2273 if (ACPI_FAILURE(status))
2276 case ACPI_TYPE_THERMAL:
2277 *type = ACPI_BUS_TYPE_THERMAL;
2278 *sta = ACPI_STA_DEFAULT;
2280 case ACPI_TYPE_POWER:
2281 *type = ACPI_BUS_TYPE_POWER;
2282 *sta = ACPI_STA_DEFAULT;
2291 bool acpi_device_is_present(struct acpi_device *adev)
2293 if (adev->status.present || adev->status.functional)
2296 adev->flags.initialized = false;
2300 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
2302 const struct acpi_device_id **matchid)
2304 const struct acpi_device_id *devid;
2307 return handler->match(idstr, matchid);
2309 for (devid = handler->ids; devid->id[0]; devid++)
2310 if (!strcmp((char *)devid->id, idstr)) {
2320 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
2321 const struct acpi_device_id **matchid)
2323 struct acpi_scan_handler *handler;
2325 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
2326 if (acpi_scan_handler_matching(handler, idstr, matchid))
2332 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
2334 if (!!hotplug->enabled == !!val)
2337 mutex_lock(&acpi_scan_lock);
2339 hotplug->enabled = val;
2341 mutex_unlock(&acpi_scan_lock);
2344 static void acpi_scan_init_hotplug(struct acpi_device *adev)
2346 struct acpi_hardware_id *hwid;
2348 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
2349 acpi_dock_add(adev);
2352 list_for_each_entry(hwid, &adev->pnp.ids, list) {
2353 struct acpi_scan_handler *handler;
2355 handler = acpi_scan_match_handler(hwid->id, NULL);
2357 adev->flags.hotplug_notify = true;
2363 static void acpi_device_dep_initialize(struct acpi_device *adev)
2365 struct acpi_dep_data *dep;
2366 struct acpi_handle_list dep_devices;
2370 if (!acpi_has_method(adev->handle, "_DEP"))
2373 status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
2375 if (ACPI_FAILURE(status)) {
2376 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
2380 for (i = 0; i < dep_devices.count; i++) {
2381 struct acpi_device_info *info;
2384 status = acpi_get_object_info(dep_devices.handles[i], &info);
2385 if (ACPI_FAILURE(status)) {
2386 dev_dbg(&adev->dev, "Error reading _DEP device info\n");
2391 * Skip the dependency of Windows System Power
2392 * Management Controller
2394 skip = info->valid & ACPI_VALID_HID &&
2395 !strcmp(info->hardware_id.string, "INT3396");
2402 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
2406 dep->master = dep_devices.handles[i];
2407 dep->slave = adev->handle;
2410 mutex_lock(&acpi_dep_list_lock);
2411 list_add_tail(&dep->node , &acpi_dep_list);
2412 mutex_unlock(&acpi_dep_list_lock);
2416 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
2417 void *not_used, void **return_value)
2419 struct acpi_device *device = NULL;
2421 unsigned long long sta;
2424 acpi_bus_get_device(handle, &device);
2428 result = acpi_bus_type_and_status(handle, &type, &sta);
2432 if (type == ACPI_BUS_TYPE_POWER) {
2433 acpi_add_power_resource(handle);
2437 acpi_add_single_object(&device, handle, type, sta);
2439 return AE_CTRL_DEPTH;
2441 acpi_scan_init_hotplug(device);
2442 acpi_device_dep_initialize(device);
2446 *return_value = device;
2451 static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
2453 bool *is_spi_i2c_slave_p = data;
2455 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
2459 * devices that are connected to UART still need to be enumerated to
2462 if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
2463 *is_spi_i2c_slave_p = true;
2465 /* no need to do more checking */
2469 static void acpi_default_enumeration(struct acpi_device *device)
2471 struct list_head resource_list;
2472 bool is_spi_i2c_slave = false;
2475 * Do not enemerate SPI/I2C slaves as they will be enuerated by their
2476 * respective parents.
2478 INIT_LIST_HEAD(&resource_list);
2479 acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
2481 acpi_dev_free_resource_list(&resource_list);
2482 if (!is_spi_i2c_slave)
2483 acpi_create_platform_device(device);
2486 static const struct acpi_device_id generic_device_ids[] = {
2487 {ACPI_DT_NAMESPACE_HID, },
2491 static int acpi_generic_device_attach(struct acpi_device *adev,
2492 const struct acpi_device_id *not_used)
2495 * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
2496 * below can be unconditional.
2498 if (adev->data.of_compatible)
2499 acpi_default_enumeration(adev);
2504 static struct acpi_scan_handler generic_device_handler = {
2505 .ids = generic_device_ids,
2506 .attach = acpi_generic_device_attach,
2509 static int acpi_scan_attach_handler(struct acpi_device *device)
2511 struct acpi_hardware_id *hwid;
2514 list_for_each_entry(hwid, &device->pnp.ids, list) {
2515 const struct acpi_device_id *devid;
2516 struct acpi_scan_handler *handler;
2518 handler = acpi_scan_match_handler(hwid->id, &devid);
2520 if (!handler->attach) {
2521 device->pnp.type.platform_id = 0;
2524 device->handler = handler;
2525 ret = handler->attach(device, devid);
2529 device->handler = NULL;
2538 static void acpi_bus_attach(struct acpi_device *device)
2540 struct acpi_device *child;
2544 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2545 register_dock_dependent_device(device, ejd);
2547 acpi_bus_get_status(device);
2548 /* Skip devices that are not present. */
2549 if (!acpi_device_is_present(device)) {
2550 device->flags.visited = false;
2551 device->flags.power_manageable = 0;
2554 if (device->handler)
2557 if (!device->flags.initialized) {
2558 device->flags.power_manageable =
2559 device->power.states[ACPI_STATE_D0].flags.valid;
2560 if (acpi_bus_init_power(device))
2561 device->flags.power_manageable = 0;
2563 device->flags.initialized = true;
2565 device->flags.visited = false;
2566 ret = acpi_scan_attach_handler(device);
2570 device->flags.match_driver = true;
2572 ret = device_attach(&device->dev);
2576 if (!ret && device->pnp.type.platform_id)
2577 acpi_default_enumeration(device);
2579 device->flags.visited = true;
2582 list_for_each_entry(child, &device->children, node)
2583 acpi_bus_attach(child);
2585 if (device->handler && device->handler->hotplug.notify_online)
2586 device->handler->hotplug.notify_online(device);
2589 void acpi_walk_dep_device_list(acpi_handle handle)
2591 struct acpi_dep_data *dep, *tmp;
2592 struct acpi_device *adev;
2594 mutex_lock(&acpi_dep_list_lock);
2595 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
2596 if (dep->master == handle) {
2597 acpi_bus_get_device(dep->slave, &adev);
2602 if (!adev->dep_unmet)
2603 acpi_bus_attach(adev);
2604 list_del(&dep->node);
2608 mutex_unlock(&acpi_dep_list_lock);
2610 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
2613 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2614 * @handle: Root of the namespace scope to scan.
2616 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2619 * If no devices were found, -ENODEV is returned, but it does not mean that
2620 * there has been a real error. There just have been no suitable ACPI objects
2621 * in the table trunk from which the kernel could create a device and add an
2622 * appropriate driver.
2624 * Must be called under acpi_scan_lock.
2626 int acpi_bus_scan(acpi_handle handle)
2628 void *device = NULL;
2630 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2631 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2632 acpi_bus_check_add, NULL, NULL, &device);
2635 acpi_bus_attach(device);
2640 EXPORT_SYMBOL(acpi_bus_scan);
2643 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2644 * @adev: Root of the ACPI namespace scope to walk.
2646 * Must be called under acpi_scan_lock.
2648 void acpi_bus_trim(struct acpi_device *adev)
2650 struct acpi_scan_handler *handler = adev->handler;
2651 struct acpi_device *child;
2653 list_for_each_entry_reverse(child, &adev->children, node)
2654 acpi_bus_trim(child);
2656 adev->flags.match_driver = false;
2658 if (handler->detach)
2659 handler->detach(adev);
2661 adev->handler = NULL;
2663 device_release_driver(&adev->dev);
2666 * Most likely, the device is going away, so put it into D3cold before
2669 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2670 adev->flags.initialized = false;
2671 adev->flags.visited = false;
2673 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2675 static int acpi_bus_scan_fixed(void)
2680 * Enumerate all fixed-feature devices.
2682 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2683 struct acpi_device *device = NULL;
2685 result = acpi_add_single_object(&device, NULL,
2686 ACPI_BUS_TYPE_POWER_BUTTON,
2691 device->flags.match_driver = true;
2692 result = device_attach(&device->dev);
2696 device_init_wakeup(&device->dev, true);
2699 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2700 struct acpi_device *device = NULL;
2702 result = acpi_add_single_object(&device, NULL,
2703 ACPI_BUS_TYPE_SLEEP_BUTTON,
2708 device->flags.match_driver = true;
2709 result = device_attach(&device->dev);
2712 return result < 0 ? result : 0;
2715 int __init acpi_scan_init(void)
2719 result = bus_register(&acpi_bus_type);
2721 /* We don't want to quit even if we failed to add suspend/resume */
2722 printk(KERN_ERR PREFIX "Could not register bus type\n");
2725 acpi_pci_root_init();
2726 acpi_pci_link_init();
2727 acpi_processor_init();
2730 acpi_cmos_rtc_init();
2731 acpi_container_init();
2732 acpi_memory_hotplug_init();
2734 acpi_int340x_thermal_init();
2736 acpi_scan_add_handler(&generic_device_handler);
2738 mutex_lock(&acpi_scan_lock);
2740 * Enumerate devices in the ACPI namespace.
2742 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2746 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2750 /* Fixed feature devices do not exist on HW-reduced platform */
2751 if (!acpi_gbl_reduced_hardware) {
2752 result = acpi_bus_scan_fixed();
2754 acpi_detach_data(acpi_root->handle,
2755 acpi_scan_drop_device);
2756 acpi_device_del(acpi_root);
2757 put_device(&acpi_root->dev);
2762 acpi_update_all_gpes();
2765 mutex_unlock(&acpi_scan_lock);