2 * scan.c - support for transforming the ACPI namespace into individual objects
5 #include <linux/module.h>
6 #include <linux/init.h>
7 #include <linux/slab.h>
8 #include <linux/kernel.h>
9 #include <linux/acpi.h>
10 #include <linux/signal.h>
11 #include <linux/kthread.h>
12 #include <linux/dmi.h>
13 #include <linux/nls.h>
15 #include <asm/pgtable.h>
19 #define _COMPONENT ACPI_BUS_COMPONENT
20 ACPI_MODULE_NAME("scan");
21 extern struct acpi_device *acpi_root;
23 #define ACPI_BUS_CLASS "system_bus"
24 #define ACPI_BUS_HID "LNXSYBUS"
25 #define ACPI_BUS_DEVICE_NAME "System Bus"
27 #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
29 #define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page)
32 * If set, devices will be hot-removed even if they cannot be put offline
33 * gracefully (from the kernel's standpoint).
35 bool acpi_force_hot_remove;
37 static const char *dummy_hid = "device";
39 static LIST_HEAD(acpi_bus_id_list);
40 static DEFINE_MUTEX(acpi_scan_lock);
41 static LIST_HEAD(acpi_scan_handlers_list);
42 DEFINE_MUTEX(acpi_device_lock);
43 LIST_HEAD(acpi_wakeup_device_list);
45 struct acpi_device_bus_id{
47 unsigned int instance_no;
48 struct list_head node;
51 void acpi_scan_lock_acquire(void)
53 mutex_lock(&acpi_scan_lock);
55 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
57 void acpi_scan_lock_release(void)
59 mutex_unlock(&acpi_scan_lock);
61 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
63 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
65 if (!handler || !handler->attach)
68 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
72 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
73 const char *hotplug_profile_name)
77 error = acpi_scan_add_handler(handler);
81 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
86 * Creates hid/cid(s) string needed for modalias and uevent
87 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
88 * char *modalias: "acpi:IBM0001:ACPI0001"
90 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
95 struct acpi_hardware_id *id;
97 if (list_empty(&acpi_dev->pnp.ids))
100 len = snprintf(modalias, size, "acpi:");
103 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
104 count = snprintf(&modalias[len], size, "%s:", id->id);
105 if (count < 0 || count >= size)
111 modalias[len] = '\0';
116 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
117 struct acpi_device *acpi_dev = to_acpi_device(dev);
120 /* Device has no HID and no CID or string is >1024 */
121 len = create_modalias(acpi_dev, buf, 1024);
127 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
129 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
131 struct acpi_device_physical_node *pn;
134 mutex_lock(&adev->physical_node_lock);
136 list_for_each_entry(pn, &adev->physical_node_list, node)
137 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
139 kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
145 mutex_unlock(&adev->physical_node_lock);
149 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
152 struct acpi_device *device = NULL;
153 struct acpi_device_physical_node *pn;
154 bool second_pass = (bool)data;
155 acpi_status status = AE_OK;
157 if (acpi_bus_get_device(handle, &device))
160 if (device->handler && !device->handler->hotplug.enabled) {
161 *ret_p = &device->dev;
165 mutex_lock(&device->physical_node_lock);
167 list_for_each_entry(pn, &device->physical_node_list, node) {
171 /* Skip devices offlined by the first pass. */
175 pn->put_online = false;
177 ret = device_offline(pn->dev);
178 if (acpi_force_hot_remove)
182 pn->put_online = !ret;
192 mutex_unlock(&device->physical_node_lock);
197 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
200 struct acpi_device *device = NULL;
201 struct acpi_device_physical_node *pn;
203 if (acpi_bus_get_device(handle, &device))
206 mutex_lock(&device->physical_node_lock);
208 list_for_each_entry(pn, &device->physical_node_list, node)
209 if (pn->put_online) {
210 device_online(pn->dev);
211 pn->put_online = false;
214 mutex_unlock(&device->physical_node_lock);
219 static int acpi_scan_try_to_offline(struct acpi_device *device)
221 acpi_handle handle = device->handle;
222 struct device *errdev = NULL;
226 * Carry out two passes here and ignore errors in the first pass,
227 * because if the devices in question are memory blocks and
228 * CONFIG_MEMCG is set, one of the blocks may hold data structures
229 * that the other blocks depend on, but it is not known in advance which
232 * If the first pass is successful, the second one isn't needed, though.
234 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
235 NULL, acpi_bus_offline, (void *)false,
237 if (status == AE_SUPPORT) {
238 dev_warn(errdev, "Offline disabled.\n");
239 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
240 acpi_bus_online, NULL, NULL, NULL);
243 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
246 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
247 NULL, acpi_bus_offline, (void *)true,
249 if (!errdev || acpi_force_hot_remove)
250 acpi_bus_offline(handle, 0, (void *)true,
253 if (errdev && !acpi_force_hot_remove) {
254 dev_warn(errdev, "Offline failed.\n");
255 acpi_bus_online(handle, 0, NULL, NULL);
256 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
257 ACPI_UINT32_MAX, acpi_bus_online,
265 static int acpi_scan_hot_remove(struct acpi_device *device)
267 acpi_handle handle = device->handle;
268 unsigned long long sta;
271 if (device->handler->hotplug.demand_offline && !acpi_force_hot_remove) {
272 if (!acpi_scan_is_offline(device, true))
275 int error = acpi_scan_try_to_offline(device);
280 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
281 "Hot-removing device %s...\n", dev_name(&device->dev)));
283 acpi_bus_trim(device);
285 acpi_evaluate_lck(handle, 0);
289 status = acpi_evaluate_ej0(handle);
290 if (status == AE_NOT_FOUND)
292 else if (ACPI_FAILURE(status))
296 * Verify if eject was indeed successful. If not, log an error
297 * message. No need to call _OST since _EJ0 call was made OK.
299 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
300 if (ACPI_FAILURE(status)) {
301 acpi_handle_warn(handle,
302 "Status check after eject failed (0x%x)\n", status);
303 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
304 acpi_handle_warn(handle,
305 "Eject incomplete - status 0x%llx\n", sta);
311 static int acpi_scan_device_not_present(struct acpi_device *adev)
313 if (!acpi_device_enumerated(adev)) {
314 dev_warn(&adev->dev, "Still not present\n");
321 static int acpi_scan_device_check(struct acpi_device *adev)
325 acpi_bus_get_status(adev);
326 if (adev->status.present || adev->status.functional) {
328 * This function is only called for device objects for which
329 * matching scan handlers exist. The only situation in which
330 * the scan handler is not attached to this device object yet
331 * is when the device has just appeared (either it wasn't
332 * present at all before or it was removed and then added
336 dev_warn(&adev->dev, "Already enumerated\n");
339 error = acpi_bus_scan(adev->handle);
341 dev_warn(&adev->dev, "Namespace scan failure\n");
344 if (!adev->handler) {
345 dev_warn(&adev->dev, "Enumeration failure\n");
349 error = acpi_scan_device_not_present(adev);
354 static int acpi_scan_bus_check(struct acpi_device *adev)
356 struct acpi_scan_handler *handler = adev->handler;
357 struct acpi_device *child;
360 acpi_bus_get_status(adev);
361 if (!(adev->status.present || adev->status.functional)) {
362 acpi_scan_device_not_present(adev);
365 if (handler && handler->hotplug.scan_dependent)
366 return handler->hotplug.scan_dependent(adev);
368 error = acpi_bus_scan(adev->handle);
370 dev_warn(&adev->dev, "Namespace scan failure\n");
373 list_for_each_entry(child, &adev->children, node) {
374 error = acpi_scan_bus_check(child);
381 static void acpi_device_hotplug(void *data, u32 src)
383 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
384 struct acpi_device *adev = data;
387 lock_device_hotplug();
388 mutex_lock(&acpi_scan_lock);
391 * The device object's ACPI handle cannot become invalid as long as we
392 * are holding acpi_scan_lock, but it may have become invalid before
393 * that lock was acquired.
395 if (adev->handle == INVALID_ACPI_HANDLE)
399 case ACPI_NOTIFY_BUS_CHECK:
400 error = acpi_scan_bus_check(adev);
402 case ACPI_NOTIFY_DEVICE_CHECK:
403 error = acpi_scan_device_check(adev);
405 case ACPI_NOTIFY_EJECT_REQUEST:
406 case ACPI_OST_EC_OSPM_EJECT:
407 error = acpi_scan_hot_remove(adev);
414 ost_code = ACPI_OST_SC_SUCCESS;
417 acpi_evaluate_hotplug_ost(adev->handle, src, ost_code, NULL);
418 put_device(&adev->dev);
419 mutex_unlock(&acpi_scan_lock);
420 unlock_device_hotplug();
423 static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
425 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
426 struct acpi_scan_handler *handler = data;
427 struct acpi_device *adev;
430 if (acpi_bus_get_device(handle, &adev))
434 case ACPI_NOTIFY_BUS_CHECK:
435 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
437 case ACPI_NOTIFY_DEVICE_CHECK:
438 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
440 case ACPI_NOTIFY_EJECT_REQUEST:
441 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
442 if (!handler->hotplug.enabled) {
443 acpi_handle_err(handle, "Eject disabled\n");
444 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
447 acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST,
448 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
451 /* non-hotplug event; possibly handled by other handler */
454 get_device(&adev->dev);
455 status = acpi_hotplug_execute(acpi_device_hotplug, adev, type);
456 if (ACPI_SUCCESS(status))
459 put_device(&adev->dev);
462 acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL);
465 static ssize_t real_power_state_show(struct device *dev,
466 struct device_attribute *attr, char *buf)
468 struct acpi_device *adev = to_acpi_device(dev);
472 ret = acpi_device_get_power(adev, &state);
476 return sprintf(buf, "%s\n", acpi_power_state_string(state));
479 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
481 static ssize_t power_state_show(struct device *dev,
482 struct device_attribute *attr, char *buf)
484 struct acpi_device *adev = to_acpi_device(dev);
486 return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
489 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
492 acpi_eject_store(struct device *d, struct device_attribute *attr,
493 const char *buf, size_t count)
495 struct acpi_device *acpi_device = to_acpi_device(d);
496 acpi_object_type not_used;
499 if (!count || buf[0] != '1')
502 if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
503 && !acpi_device->driver)
506 status = acpi_get_type(acpi_device->handle, ¬_used);
507 if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
510 acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
511 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
512 get_device(&acpi_device->dev);
513 status = acpi_hotplug_execute(acpi_device_hotplug, acpi_device,
514 ACPI_OST_EC_OSPM_EJECT);
515 if (ACPI_SUCCESS(status))
518 put_device(&acpi_device->dev);
519 acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
520 ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
521 return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
524 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
527 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
528 struct acpi_device *acpi_dev = to_acpi_device(dev);
530 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
532 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
534 static ssize_t acpi_device_uid_show(struct device *dev,
535 struct device_attribute *attr, char *buf)
537 struct acpi_device *acpi_dev = to_acpi_device(dev);
539 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
541 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
543 static ssize_t acpi_device_adr_show(struct device *dev,
544 struct device_attribute *attr, char *buf)
546 struct acpi_device *acpi_dev = to_acpi_device(dev);
548 return sprintf(buf, "0x%08x\n",
549 (unsigned int)(acpi_dev->pnp.bus_address));
551 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
554 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
555 struct acpi_device *acpi_dev = to_acpi_device(dev);
556 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
559 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
563 result = sprintf(buf, "%s\n", (char*)path.pointer);
568 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
570 /* sysfs file that shows description text from the ACPI _STR method */
571 static ssize_t description_show(struct device *dev,
572 struct device_attribute *attr,
574 struct acpi_device *acpi_dev = to_acpi_device(dev);
577 if (acpi_dev->pnp.str_obj == NULL)
581 * The _STR object contains a Unicode identifier for a device.
582 * We need to convert to utf-8 so it can be displayed.
584 result = utf16s_to_utf8s(
585 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
586 acpi_dev->pnp.str_obj->buffer.length,
587 UTF16_LITTLE_ENDIAN, buf,
590 buf[result++] = '\n';
594 static DEVICE_ATTR(description, 0444, description_show, NULL);
597 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
599 struct acpi_device *acpi_dev = to_acpi_device(dev);
601 return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
603 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
605 static ssize_t status_show(struct device *dev, struct device_attribute *attr,
607 struct acpi_device *acpi_dev = to_acpi_device(dev);
609 unsigned long long sta;
611 status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta);
612 if (ACPI_FAILURE(status))
615 return sprintf(buf, "%llu\n", sta);
617 static DEVICE_ATTR_RO(status);
619 static int acpi_device_setup_files(struct acpi_device *dev)
621 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
623 unsigned long long sun;
627 * Devices gotten from FADT don't have a "path" attribute
630 result = device_create_file(&dev->dev, &dev_attr_path);
635 if (!list_empty(&dev->pnp.ids)) {
636 result = device_create_file(&dev->dev, &dev_attr_hid);
640 result = device_create_file(&dev->dev, &dev_attr_modalias);
646 * If device has _STR, 'description' file is created
648 if (acpi_has_method(dev->handle, "_STR")) {
649 status = acpi_evaluate_object(dev->handle, "_STR",
651 if (ACPI_FAILURE(status))
652 buffer.pointer = NULL;
653 dev->pnp.str_obj = buffer.pointer;
654 result = device_create_file(&dev->dev, &dev_attr_description);
659 if (dev->pnp.type.bus_address)
660 result = device_create_file(&dev->dev, &dev_attr_adr);
661 if (dev->pnp.unique_id)
662 result = device_create_file(&dev->dev, &dev_attr_uid);
664 status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
665 if (ACPI_SUCCESS(status)) {
666 dev->pnp.sun = (unsigned long)sun;
667 result = device_create_file(&dev->dev, &dev_attr_sun);
671 dev->pnp.sun = (unsigned long)-1;
674 if (acpi_has_method(dev->handle, "_STA")) {
675 result = device_create_file(&dev->dev, &dev_attr_status);
681 * If device has _EJ0, 'eject' file is created that is used to trigger
682 * hot-removal function from userland.
684 if (acpi_has_method(dev->handle, "_EJ0")) {
685 result = device_create_file(&dev->dev, &dev_attr_eject);
690 if (dev->flags.power_manageable) {
691 result = device_create_file(&dev->dev, &dev_attr_power_state);
695 if (dev->power.flags.power_resources)
696 result = device_create_file(&dev->dev,
697 &dev_attr_real_power_state);
704 static void acpi_device_remove_files(struct acpi_device *dev)
706 if (dev->flags.power_manageable) {
707 device_remove_file(&dev->dev, &dev_attr_power_state);
708 if (dev->power.flags.power_resources)
709 device_remove_file(&dev->dev,
710 &dev_attr_real_power_state);
714 * If device has _STR, remove 'description' file
716 if (acpi_has_method(dev->handle, "_STR")) {
717 kfree(dev->pnp.str_obj);
718 device_remove_file(&dev->dev, &dev_attr_description);
721 * If device has _EJ0, remove 'eject' file.
723 if (acpi_has_method(dev->handle, "_EJ0"))
724 device_remove_file(&dev->dev, &dev_attr_eject);
726 if (acpi_has_method(dev->handle, "_SUN"))
727 device_remove_file(&dev->dev, &dev_attr_sun);
729 if (dev->pnp.unique_id)
730 device_remove_file(&dev->dev, &dev_attr_uid);
731 if (dev->pnp.type.bus_address)
732 device_remove_file(&dev->dev, &dev_attr_adr);
733 device_remove_file(&dev->dev, &dev_attr_modalias);
734 device_remove_file(&dev->dev, &dev_attr_hid);
735 if (acpi_has_method(dev->handle, "_STA"))
736 device_remove_file(&dev->dev, &dev_attr_status);
738 device_remove_file(&dev->dev, &dev_attr_path);
740 /* --------------------------------------------------------------------------
742 -------------------------------------------------------------------------- */
744 static const struct acpi_device_id *__acpi_match_device(
745 struct acpi_device *device, const struct acpi_device_id *ids)
747 const struct acpi_device_id *id;
748 struct acpi_hardware_id *hwid;
751 * If the device is not present, it is unnecessary to load device
754 if (!device->status.present)
757 for (id = ids; id->id[0]; id++)
758 list_for_each_entry(hwid, &device->pnp.ids, list)
759 if (!strcmp((char *) id->id, hwid->id))
766 * acpi_match_device - Match a struct device against a given list of ACPI IDs
767 * @ids: Array of struct acpi_device_id object to match against.
768 * @dev: The device structure to match.
770 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
771 * object for that handle and use that object to match against a given list of
774 * Return a pointer to the first matching ID on success or %NULL on failure.
776 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
777 const struct device *dev)
779 struct acpi_device *adev;
780 acpi_handle handle = ACPI_HANDLE(dev);
782 if (!ids || !handle || acpi_bus_get_device(handle, &adev))
785 return __acpi_match_device(adev, ids);
787 EXPORT_SYMBOL_GPL(acpi_match_device);
789 int acpi_match_device_ids(struct acpi_device *device,
790 const struct acpi_device_id *ids)
792 return __acpi_match_device(device, ids) ? 0 : -ENOENT;
794 EXPORT_SYMBOL(acpi_match_device_ids);
796 static void acpi_free_power_resources_lists(struct acpi_device *device)
800 if (device->wakeup.flags.valid)
801 acpi_power_resources_list_free(&device->wakeup.resources);
803 if (!device->flags.power_manageable)
806 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
807 struct acpi_device_power_state *ps = &device->power.states[i];
808 acpi_power_resources_list_free(&ps->resources);
812 static void acpi_device_release(struct device *dev)
814 struct acpi_device *acpi_dev = to_acpi_device(dev);
816 acpi_free_pnp_ids(&acpi_dev->pnp);
817 acpi_free_power_resources_lists(acpi_dev);
821 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
823 struct acpi_device *acpi_dev = to_acpi_device(dev);
824 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
826 return acpi_dev->flags.match_driver
827 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
830 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
832 struct acpi_device *acpi_dev = to_acpi_device(dev);
835 if (list_empty(&acpi_dev->pnp.ids))
838 if (add_uevent_var(env, "MODALIAS="))
840 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
841 sizeof(env->buf) - env->buflen);
842 if (len >= (sizeof(env->buf) - env->buflen))
848 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
850 struct acpi_device *device = data;
852 device->driver->ops.notify(device, event);
855 static acpi_status acpi_device_notify_fixed(void *data)
857 struct acpi_device *device = data;
859 /* Fixed hardware devices have no handles */
860 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
864 static int acpi_device_install_notify_handler(struct acpi_device *device)
868 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
870 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
871 acpi_device_notify_fixed,
873 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
875 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
876 acpi_device_notify_fixed,
879 status = acpi_install_notify_handler(device->handle,
884 if (ACPI_FAILURE(status))
889 static void acpi_device_remove_notify_handler(struct acpi_device *device)
891 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
892 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
893 acpi_device_notify_fixed);
894 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
895 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
896 acpi_device_notify_fixed);
898 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
902 static int acpi_device_probe(struct device *dev)
904 struct acpi_device *acpi_dev = to_acpi_device(dev);
905 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
908 if (acpi_dev->handler)
911 if (!acpi_drv->ops.add)
914 ret = acpi_drv->ops.add(acpi_dev);
918 acpi_dev->driver = acpi_drv;
919 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
920 "Driver [%s] successfully bound to device [%s]\n",
921 acpi_drv->name, acpi_dev->pnp.bus_id));
923 if (acpi_drv->ops.notify) {
924 ret = acpi_device_install_notify_handler(acpi_dev);
926 if (acpi_drv->ops.remove)
927 acpi_drv->ops.remove(acpi_dev);
929 acpi_dev->driver = NULL;
930 acpi_dev->driver_data = NULL;
935 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
936 acpi_drv->name, acpi_dev->pnp.bus_id));
941 static int acpi_device_remove(struct device * dev)
943 struct acpi_device *acpi_dev = to_acpi_device(dev);
944 struct acpi_driver *acpi_drv = acpi_dev->driver;
947 if (acpi_drv->ops.notify)
948 acpi_device_remove_notify_handler(acpi_dev);
949 if (acpi_drv->ops.remove)
950 acpi_drv->ops.remove(acpi_dev);
952 acpi_dev->driver = NULL;
953 acpi_dev->driver_data = NULL;
959 struct bus_type acpi_bus_type = {
961 .match = acpi_bus_match,
962 .probe = acpi_device_probe,
963 .remove = acpi_device_remove,
964 .uevent = acpi_device_uevent,
967 static void acpi_device_del(struct acpi_device *device)
969 mutex_lock(&acpi_device_lock);
971 list_del(&device->node);
973 list_del(&device->wakeup_list);
974 mutex_unlock(&acpi_device_lock);
976 acpi_power_add_remove_device(device, false);
977 acpi_device_remove_files(device);
979 device->remove(device);
981 device_del(&device->dev);
984 static LIST_HEAD(acpi_device_del_list);
985 static DEFINE_MUTEX(acpi_device_del_lock);
987 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
990 struct acpi_device *adev;
992 mutex_lock(&acpi_device_del_lock);
994 if (list_empty(&acpi_device_del_list)) {
995 mutex_unlock(&acpi_device_del_lock);
998 adev = list_first_entry(&acpi_device_del_list,
999 struct acpi_device, del_list);
1000 list_del(&adev->del_list);
1002 mutex_unlock(&acpi_device_del_lock);
1004 acpi_device_del(adev);
1006 * Drop references to all power resources that might have been
1007 * used by the device.
1009 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
1010 put_device(&adev->dev);
1015 * acpi_scan_drop_device - Drop an ACPI device object.
1016 * @handle: Handle of an ACPI namespace node, not used.
1017 * @context: Address of the ACPI device object to drop.
1019 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
1020 * namespace node the device object pointed to by @context is attached to.
1022 * The unregistration is carried out asynchronously to avoid running
1023 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
1024 * ensure the correct ordering (the device objects must be unregistered in the
1025 * same order in which the corresponding namespace nodes are deleted).
1027 static void acpi_scan_drop_device(acpi_handle handle, void *context)
1029 static DECLARE_WORK(work, acpi_device_del_work_fn);
1030 struct acpi_device *adev = context;
1032 mutex_lock(&acpi_device_del_lock);
1035 * Use the ACPI hotplug workqueue which is ordered, so this work item
1036 * won't run after any hotplug work items submitted subsequently. That
1037 * prevents attempts to register device objects identical to those being
1038 * deleted from happening concurrently (such attempts result from
1039 * hotplug events handled via the ACPI hotplug workqueue). It also will
1040 * run after all of the work items submitted previosuly, which helps
1041 * those work items to ensure that they are not accessing stale device
1044 if (list_empty(&acpi_device_del_list))
1045 acpi_queue_hotplug_work(&work);
1047 list_add_tail(&adev->del_list, &acpi_device_del_list);
1048 /* Make acpi_ns_validate_handle() return NULL for this handle. */
1049 adev->handle = INVALID_ACPI_HANDLE;
1051 mutex_unlock(&acpi_device_del_lock);
1054 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
1061 status = acpi_get_data(handle, acpi_scan_drop_device, (void **)device);
1062 if (ACPI_FAILURE(status) || !*device) {
1063 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
1069 EXPORT_SYMBOL(acpi_bus_get_device);
1071 int acpi_device_add(struct acpi_device *device,
1072 void (*release)(struct device *))
1075 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
1078 if (device->handle) {
1081 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
1083 if (ACPI_FAILURE(status)) {
1084 acpi_handle_err(device->handle,
1085 "Unable to attach device data\n");
1093 * Link this device to its parent and siblings.
1095 INIT_LIST_HEAD(&device->children);
1096 INIT_LIST_HEAD(&device->node);
1097 INIT_LIST_HEAD(&device->wakeup_list);
1098 INIT_LIST_HEAD(&device->physical_node_list);
1099 INIT_LIST_HEAD(&device->del_list);
1100 mutex_init(&device->physical_node_lock);
1102 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
1104 pr_err(PREFIX "Memory allocation error\n");
1109 mutex_lock(&acpi_device_lock);
1111 * Find suitable bus_id and instance number in acpi_bus_id_list
1112 * If failed, create one and link it into acpi_bus_id_list
1114 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1115 if (!strcmp(acpi_device_bus_id->bus_id,
1116 acpi_device_hid(device))) {
1117 acpi_device_bus_id->instance_no++;
1124 acpi_device_bus_id = new_bus_id;
1125 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1126 acpi_device_bus_id->instance_no = 0;
1127 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1129 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1132 list_add_tail(&device->node, &device->parent->children);
1134 if (device->wakeup.flags.valid)
1135 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1136 mutex_unlock(&acpi_device_lock);
1139 device->dev.parent = &device->parent->dev;
1140 device->dev.bus = &acpi_bus_type;
1141 device->dev.release = release;
1142 result = device_add(&device->dev);
1144 dev_err(&device->dev, "Error registering device\n");
1148 result = acpi_device_setup_files(device);
1150 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1151 dev_name(&device->dev));
1156 mutex_lock(&acpi_device_lock);
1158 list_del(&device->node);
1159 list_del(&device->wakeup_list);
1160 mutex_unlock(&acpi_device_lock);
1163 acpi_detach_data(device->handle, acpi_scan_drop_device);
1167 /* --------------------------------------------------------------------------
1169 -------------------------------------------------------------------------- */
1171 * acpi_bus_register_driver - register a driver with the ACPI bus
1172 * @driver: driver being registered
1174 * Registers a driver with the ACPI bus. Searches the namespace for all
1175 * devices that match the driver's criteria and binds. Returns zero for
1176 * success or a negative error status for failure.
1178 int acpi_bus_register_driver(struct acpi_driver *driver)
1184 driver->drv.name = driver->name;
1185 driver->drv.bus = &acpi_bus_type;
1186 driver->drv.owner = driver->owner;
1188 ret = driver_register(&driver->drv);
1192 EXPORT_SYMBOL(acpi_bus_register_driver);
1195 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
1196 * @driver: driver to unregister
1198 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1199 * devices that match the driver's criteria and unbinds.
1201 void acpi_bus_unregister_driver(struct acpi_driver *driver)
1203 driver_unregister(&driver->drv);
1206 EXPORT_SYMBOL(acpi_bus_unregister_driver);
1208 /* --------------------------------------------------------------------------
1210 -------------------------------------------------------------------------- */
1211 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1213 struct acpi_device *device = NULL;
1217 * Fixed hardware devices do not appear in the namespace and do not
1218 * have handles, but we fabricate acpi_devices for them, so we have
1219 * to deal with them specially.
1225 status = acpi_get_parent(handle, &handle);
1226 if (ACPI_FAILURE(status))
1227 return status == AE_NULL_ENTRY ? NULL : acpi_root;
1228 } while (acpi_bus_get_device(handle, &device));
1233 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1237 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1238 union acpi_object *obj;
1240 status = acpi_get_handle(handle, "_EJD", &tmp);
1241 if (ACPI_FAILURE(status))
1244 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1245 if (ACPI_SUCCESS(status)) {
1246 obj = buffer.pointer;
1247 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1249 kfree(buffer.pointer);
1253 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1255 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1256 struct acpi_device_wakeup *wakeup)
1258 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1259 union acpi_object *package = NULL;
1260 union acpi_object *element = NULL;
1267 INIT_LIST_HEAD(&wakeup->resources);
1270 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1271 if (ACPI_FAILURE(status)) {
1272 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1276 package = (union acpi_object *)buffer.pointer;
1278 if (!package || package->package.count < 2)
1281 element = &(package->package.elements[0]);
1285 if (element->type == ACPI_TYPE_PACKAGE) {
1286 if ((element->package.count < 2) ||
1287 (element->package.elements[0].type !=
1288 ACPI_TYPE_LOCAL_REFERENCE)
1289 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1292 wakeup->gpe_device =
1293 element->package.elements[0].reference.handle;
1294 wakeup->gpe_number =
1295 (u32) element->package.elements[1].integer.value;
1296 } else if (element->type == ACPI_TYPE_INTEGER) {
1297 wakeup->gpe_device = NULL;
1298 wakeup->gpe_number = element->integer.value;
1303 element = &(package->package.elements[1]);
1304 if (element->type != ACPI_TYPE_INTEGER)
1307 wakeup->sleep_state = element->integer.value;
1309 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1313 if (!list_empty(&wakeup->resources)) {
1316 err = acpi_power_wakeup_list_init(&wakeup->resources,
1319 acpi_handle_warn(handle, "Retrieving current states "
1320 "of wakeup power resources failed\n");
1321 acpi_power_resources_list_free(&wakeup->resources);
1324 if (sleep_state < wakeup->sleep_state) {
1325 acpi_handle_warn(handle, "Overriding _PRW sleep state "
1326 "(S%d) by S%d from power resources\n",
1327 (int)wakeup->sleep_state, sleep_state);
1328 wakeup->sleep_state = sleep_state;
1331 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1334 kfree(buffer.pointer);
1338 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1340 struct acpi_device_id button_device_ids[] = {
1347 acpi_event_status event_status;
1349 device->wakeup.flags.notifier_present = 0;
1351 /* Power button, Lid switch always enable wakeup */
1352 if (!acpi_match_device_ids(device, button_device_ids)) {
1353 device->wakeup.flags.run_wake = 1;
1354 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1355 /* Do not use Lid/sleep button for S5 wakeup */
1356 if (device->wakeup.sleep_state == ACPI_STATE_S5)
1357 device->wakeup.sleep_state = ACPI_STATE_S4;
1359 device_set_wakeup_capable(&device->dev, true);
1363 status = acpi_get_gpe_status(device->wakeup.gpe_device,
1364 device->wakeup.gpe_number,
1366 if (status == AE_OK)
1367 device->wakeup.flags.run_wake =
1368 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1371 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1375 /* Presence of _PRW indicates wake capable */
1376 if (!acpi_has_method(device->handle, "_PRW"))
1379 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1382 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1386 device->wakeup.flags.valid = 1;
1387 device->wakeup.prepare_count = 0;
1388 acpi_bus_set_run_wake_flags(device);
1389 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1390 * system for the ACPI device with the _PRW object.
1391 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1392 * So it is necessary to call _DSW object first. Only when it is not
1393 * present will the _PSW object used.
1395 err = acpi_device_sleep_wake(device, 0, 0, 0);
1397 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1398 "error in _DSW or _PSW evaluation\n"));
1401 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1403 struct acpi_device_power_state *ps = &device->power.states[state];
1404 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1405 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1408 INIT_LIST_HEAD(&ps->resources);
1410 /* Evaluate "_PRx" to get referenced power resources */
1411 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1412 if (ACPI_SUCCESS(status)) {
1413 union acpi_object *package = buffer.pointer;
1415 if (buffer.length && package
1416 && package->type == ACPI_TYPE_PACKAGE
1417 && package->package.count) {
1418 int err = acpi_extract_power_resources(package, 0,
1421 device->power.flags.power_resources = 1;
1423 ACPI_FREE(buffer.pointer);
1426 /* Evaluate "_PSx" to see if we can do explicit sets */
1428 if (acpi_has_method(device->handle, pathname))
1429 ps->flags.explicit_set = 1;
1432 * State is valid if there are means to put the device into it.
1433 * D3hot is only valid if _PR3 present.
1435 if (!list_empty(&ps->resources)
1436 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1437 ps->flags.valid = 1;
1438 ps->flags.os_accessible = 1;
1441 ps->power = -1; /* Unknown - driver assigned */
1442 ps->latency = -1; /* Unknown - driver assigned */
1445 static void acpi_bus_get_power_flags(struct acpi_device *device)
1449 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1450 if (!acpi_has_method(device->handle, "_PS0") &&
1451 !acpi_has_method(device->handle, "_PR0"))
1454 device->flags.power_manageable = 1;
1457 * Power Management Flags
1459 if (acpi_has_method(device->handle, "_PSC"))
1460 device->power.flags.explicit_get = 1;
1461 if (acpi_has_method(device->handle, "_IRC"))
1462 device->power.flags.inrush_current = 1;
1465 * Enumerate supported power management states
1467 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1468 acpi_bus_init_power_state(device, i);
1470 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1472 /* Set defaults for D0 and D3 states (always valid) */
1473 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1474 device->power.states[ACPI_STATE_D0].power = 100;
1475 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1476 device->power.states[ACPI_STATE_D3_COLD].power = 0;
1478 /* Set D3cold's explicit_set flag if _PS3 exists. */
1479 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1480 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1482 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1483 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1484 device->power.flags.power_resources)
1485 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1487 if (acpi_bus_init_power(device)) {
1488 acpi_free_power_resources_lists(device);
1489 device->flags.power_manageable = 0;
1493 static void acpi_bus_get_flags(struct acpi_device *device)
1495 /* Presence of _STA indicates 'dynamic_status' */
1496 if (acpi_has_method(device->handle, "_STA"))
1497 device->flags.dynamic_status = 1;
1499 /* Presence of _RMV indicates 'removable' */
1500 if (acpi_has_method(device->handle, "_RMV"))
1501 device->flags.removable = 1;
1503 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1504 if (acpi_has_method(device->handle, "_EJD") ||
1505 acpi_has_method(device->handle, "_EJ0"))
1506 device->flags.ejectable = 1;
1509 static void acpi_device_get_busid(struct acpi_device *device)
1511 char bus_id[5] = { '?', 0 };
1512 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1518 * The device's Bus ID is simply the object name.
1519 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1521 if (ACPI_IS_ROOT_DEVICE(device)) {
1522 strcpy(device->pnp.bus_id, "ACPI");
1526 switch (device->device_type) {
1527 case ACPI_BUS_TYPE_POWER_BUTTON:
1528 strcpy(device->pnp.bus_id, "PWRF");
1530 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1531 strcpy(device->pnp.bus_id, "SLPF");
1534 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1535 /* Clean up trailing underscores (if any) */
1536 for (i = 3; i > 1; i--) {
1537 if (bus_id[i] == '_')
1542 strcpy(device->pnp.bus_id, bus_id);
1548 * acpi_ata_match - see if an acpi object is an ATA device
1550 * If an acpi object has one of the ACPI ATA methods defined,
1551 * then we can safely call it an ATA device.
1553 bool acpi_ata_match(acpi_handle handle)
1555 return acpi_has_method(handle, "_GTF") ||
1556 acpi_has_method(handle, "_GTM") ||
1557 acpi_has_method(handle, "_STM") ||
1558 acpi_has_method(handle, "_SDD");
1562 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1564 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1565 * then we can safely call it an ejectable drive bay
1567 bool acpi_bay_match(acpi_handle handle)
1569 acpi_handle phandle;
1571 if (!acpi_has_method(handle, "_EJ0"))
1573 if (acpi_ata_match(handle))
1575 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1578 return acpi_ata_match(phandle);
1582 * acpi_dock_match - see if an acpi object has a _DCK method
1584 bool acpi_dock_match(acpi_handle handle)
1586 return acpi_has_method(handle, "_DCK");
1589 const char *acpi_device_hid(struct acpi_device *device)
1591 struct acpi_hardware_id *hid;
1593 if (list_empty(&device->pnp.ids))
1596 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1599 EXPORT_SYMBOL(acpi_device_hid);
1601 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1603 struct acpi_hardware_id *id;
1605 id = kmalloc(sizeof(*id), GFP_KERNEL);
1609 id->id = kstrdup(dev_id, GFP_KERNEL);
1615 list_add_tail(&id->list, &pnp->ids);
1616 pnp->type.hardware_id = 1;
1620 * Old IBM workstations have a DSDT bug wherein the SMBus object
1621 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1622 * prefix. Work around this.
1624 static bool acpi_ibm_smbus_match(acpi_handle handle)
1626 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1627 struct acpi_buffer path = { sizeof(node_name), node_name };
1629 if (!dmi_name_in_vendors("IBM"))
1632 /* Look for SMBS object */
1633 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1634 strcmp("SMBS", path.pointer))
1637 /* Does it have the necessary (but misnamed) methods? */
1638 if (acpi_has_method(handle, "SBI") &&
1639 acpi_has_method(handle, "SBR") &&
1640 acpi_has_method(handle, "SBW"))
1646 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1650 struct acpi_device_info *info;
1651 struct acpi_pnp_device_id_list *cid_list;
1654 switch (device_type) {
1655 case ACPI_BUS_TYPE_DEVICE:
1656 if (handle == ACPI_ROOT_OBJECT) {
1657 acpi_add_id(pnp, ACPI_SYSTEM_HID);
1661 status = acpi_get_object_info(handle, &info);
1662 if (ACPI_FAILURE(status)) {
1663 pr_err(PREFIX "%s: Error reading device info\n",
1668 if (info->valid & ACPI_VALID_HID)
1669 acpi_add_id(pnp, info->hardware_id.string);
1670 if (info->valid & ACPI_VALID_CID) {
1671 cid_list = &info->compatible_id_list;
1672 for (i = 0; i < cid_list->count; i++)
1673 acpi_add_id(pnp, cid_list->ids[i].string);
1675 if (info->valid & ACPI_VALID_ADR) {
1676 pnp->bus_address = info->address;
1677 pnp->type.bus_address = 1;
1679 if (info->valid & ACPI_VALID_UID)
1680 pnp->unique_id = kstrdup(info->unique_id.string,
1686 * Some devices don't reliably have _HIDs & _CIDs, so add
1687 * synthetic HIDs to make sure drivers can find them.
1689 if (acpi_is_video_device(handle))
1690 acpi_add_id(pnp, ACPI_VIDEO_HID);
1691 else if (acpi_bay_match(handle))
1692 acpi_add_id(pnp, ACPI_BAY_HID);
1693 else if (acpi_dock_match(handle))
1694 acpi_add_id(pnp, ACPI_DOCK_HID);
1695 else if (acpi_ibm_smbus_match(handle))
1696 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1697 else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) {
1698 acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1699 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1700 strcpy(pnp->device_class, ACPI_BUS_CLASS);
1704 case ACPI_BUS_TYPE_POWER:
1705 acpi_add_id(pnp, ACPI_POWER_HID);
1707 case ACPI_BUS_TYPE_PROCESSOR:
1708 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1710 case ACPI_BUS_TYPE_THERMAL:
1711 acpi_add_id(pnp, ACPI_THERMAL_HID);
1713 case ACPI_BUS_TYPE_POWER_BUTTON:
1714 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1716 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1717 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1722 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1724 struct acpi_hardware_id *id, *tmp;
1726 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1730 kfree(pnp->unique_id);
1733 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1734 int type, unsigned long long sta)
1736 INIT_LIST_HEAD(&device->pnp.ids);
1737 device->device_type = type;
1738 device->handle = handle;
1739 device->parent = acpi_bus_get_parent(handle);
1740 acpi_set_device_status(device, sta);
1741 acpi_device_get_busid(device);
1742 acpi_set_pnp_ids(handle, &device->pnp, type);
1743 acpi_bus_get_flags(device);
1744 device->flags.match_driver = false;
1745 device->flags.initialized = true;
1746 device->flags.visited = false;
1747 device_initialize(&device->dev);
1748 dev_set_uevent_suppress(&device->dev, true);
1751 void acpi_device_add_finalize(struct acpi_device *device)
1753 dev_set_uevent_suppress(&device->dev, false);
1754 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1757 static int acpi_add_single_object(struct acpi_device **child,
1758 acpi_handle handle, int type,
1759 unsigned long long sta)
1762 struct acpi_device *device;
1763 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1765 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1767 printk(KERN_ERR PREFIX "Memory allocation error\n");
1771 acpi_init_device_object(device, handle, type, sta);
1772 acpi_bus_get_power_flags(device);
1773 acpi_bus_get_wakeup_device_flags(device);
1775 result = acpi_device_add(device, acpi_device_release);
1777 acpi_device_release(&device->dev);
1781 acpi_power_add_remove_device(device, true);
1782 acpi_device_add_finalize(device);
1783 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1784 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1785 dev_name(&device->dev), (char *) buffer.pointer,
1786 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1787 kfree(buffer.pointer);
1792 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1793 unsigned long long *sta)
1796 acpi_object_type acpi_type;
1798 status = acpi_get_type(handle, &acpi_type);
1799 if (ACPI_FAILURE(status))
1802 switch (acpi_type) {
1803 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1804 case ACPI_TYPE_DEVICE:
1805 *type = ACPI_BUS_TYPE_DEVICE;
1806 status = acpi_bus_get_status_handle(handle, sta);
1807 if (ACPI_FAILURE(status))
1810 case ACPI_TYPE_PROCESSOR:
1811 *type = ACPI_BUS_TYPE_PROCESSOR;
1812 status = acpi_bus_get_status_handle(handle, sta);
1813 if (ACPI_FAILURE(status))
1816 case ACPI_TYPE_THERMAL:
1817 *type = ACPI_BUS_TYPE_THERMAL;
1818 *sta = ACPI_STA_DEFAULT;
1820 case ACPI_TYPE_POWER:
1821 *type = ACPI_BUS_TYPE_POWER;
1822 *sta = ACPI_STA_DEFAULT;
1831 bool acpi_device_is_present(struct acpi_device *adev)
1833 if (adev->status.present || adev->status.functional)
1836 adev->flags.initialized = false;
1840 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1842 const struct acpi_device_id **matchid)
1844 const struct acpi_device_id *devid;
1846 for (devid = handler->ids; devid->id[0]; devid++)
1847 if (!strcmp((char *)devid->id, idstr)) {
1857 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
1858 const struct acpi_device_id **matchid)
1860 struct acpi_scan_handler *handler;
1862 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1863 if (acpi_scan_handler_matching(handler, idstr, matchid))
1869 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1871 if (!!hotplug->enabled == !!val)
1874 mutex_lock(&acpi_scan_lock);
1876 hotplug->enabled = val;
1878 mutex_unlock(&acpi_scan_lock);
1881 static void acpi_scan_init_hotplug(acpi_handle handle, int type)
1883 struct acpi_device_pnp pnp = {};
1884 struct acpi_hardware_id *hwid;
1885 struct acpi_scan_handler *handler;
1887 INIT_LIST_HEAD(&pnp.ids);
1888 acpi_set_pnp_ids(handle, &pnp, type);
1890 if (!pnp.type.hardware_id)
1894 * This relies on the fact that acpi_install_notify_handler() will not
1895 * install the same notify handler routine twice for the same handle.
1897 list_for_each_entry(hwid, &pnp.ids, list) {
1898 handler = acpi_scan_match_handler(hwid->id, NULL);
1900 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1901 acpi_hotplug_notify_cb, handler);
1907 acpi_free_pnp_ids(&pnp);
1910 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1911 void *not_used, void **return_value)
1913 struct acpi_device *device = NULL;
1915 unsigned long long sta;
1918 acpi_bus_get_device(handle, &device);
1922 result = acpi_bus_type_and_status(handle, &type, &sta);
1926 if (type == ACPI_BUS_TYPE_POWER) {
1927 acpi_add_power_resource(handle);
1931 acpi_scan_init_hotplug(handle, type);
1933 acpi_add_single_object(&device, handle, type, sta);
1935 return AE_CTRL_DEPTH;
1939 *return_value = device;
1944 static int acpi_scan_attach_handler(struct acpi_device *device)
1946 struct acpi_hardware_id *hwid;
1949 list_for_each_entry(hwid, &device->pnp.ids, list) {
1950 const struct acpi_device_id *devid;
1951 struct acpi_scan_handler *handler;
1953 handler = acpi_scan_match_handler(hwid->id, &devid);
1955 ret = handler->attach(device, devid);
1957 device->handler = handler;
1959 } else if (ret < 0) {
1967 static void acpi_bus_attach(struct acpi_device *device)
1969 struct acpi_device *child;
1972 acpi_bus_get_status(device);
1973 /* Skip devices that are not present. */
1974 if (!acpi_device_is_present(device)) {
1975 device->flags.visited = false;
1978 if (device->handler)
1981 if (!device->flags.initialized) {
1982 acpi_bus_update_power(device, NULL);
1983 device->flags.initialized = true;
1985 device->flags.visited = false;
1986 ret = acpi_scan_attach_handler(device);
1990 device->flags.match_driver = true;
1992 ret = device_attach(&device->dev);
1996 device->flags.visited = true;
1999 list_for_each_entry(child, &device->children, node)
2000 acpi_bus_attach(child);
2004 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2005 * @handle: Root of the namespace scope to scan.
2007 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2010 * If no devices were found, -ENODEV is returned, but it does not mean that
2011 * there has been a real error. There just have been no suitable ACPI objects
2012 * in the table trunk from which the kernel could create a device and add an
2013 * appropriate driver.
2015 * Must be called under acpi_scan_lock.
2017 int acpi_bus_scan(acpi_handle handle)
2019 void *device = NULL;
2021 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2022 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2023 acpi_bus_check_add, NULL, NULL, &device);
2026 acpi_bus_attach(device);
2031 EXPORT_SYMBOL(acpi_bus_scan);
2034 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2035 * @adev: Root of the ACPI namespace scope to walk.
2037 * Must be called under acpi_scan_lock.
2039 void acpi_bus_trim(struct acpi_device *adev)
2041 struct acpi_scan_handler *handler = adev->handler;
2042 struct acpi_device *child;
2044 list_for_each_entry_reverse(child, &adev->children, node)
2045 acpi_bus_trim(child);
2048 if (handler->detach)
2049 handler->detach(adev);
2051 adev->handler = NULL;
2053 device_release_driver(&adev->dev);
2056 * Most likely, the device is going away, so put it into D3cold before
2059 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2060 adev->flags.initialized = false;
2061 adev->flags.visited = false;
2063 EXPORT_SYMBOL_GPL(acpi_bus_trim);
2065 static int acpi_bus_scan_fixed(void)
2070 * Enumerate all fixed-feature devices.
2072 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2073 struct acpi_device *device = NULL;
2075 result = acpi_add_single_object(&device, NULL,
2076 ACPI_BUS_TYPE_POWER_BUTTON,
2081 device->flags.match_driver = true;
2082 result = device_attach(&device->dev);
2086 device_init_wakeup(&device->dev, true);
2089 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2090 struct acpi_device *device = NULL;
2092 result = acpi_add_single_object(&device, NULL,
2093 ACPI_BUS_TYPE_SLEEP_BUTTON,
2098 device->flags.match_driver = true;
2099 result = device_attach(&device->dev);
2102 return result < 0 ? result : 0;
2105 int __init acpi_scan_init(void)
2109 result = bus_register(&acpi_bus_type);
2111 /* We don't want to quit even if we failed to add suspend/resume */
2112 printk(KERN_ERR PREFIX "Could not register bus type\n");
2115 acpi_pci_root_init();
2116 acpi_pci_link_init();
2117 acpi_processor_init();
2118 acpi_platform_init();
2120 acpi_cmos_rtc_init();
2121 acpi_container_init();
2122 acpi_memory_hotplug_init();
2125 mutex_lock(&acpi_scan_lock);
2127 * Enumerate devices in the ACPI namespace.
2129 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2133 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
2137 result = acpi_bus_scan_fixed();
2139 acpi_detach_data(acpi_root->handle, acpi_scan_drop_device);
2140 acpi_device_del(acpi_root);
2141 put_device(&acpi_root->dev);
2145 acpi_update_all_gpes();
2148 mutex_unlock(&acpi_scan_lock);