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 <acpi/acpi_drivers.h>
19 #define _COMPONENT ACPI_BUS_COMPONENT
20 ACPI_MODULE_NAME("scan");
21 #define STRUCT_TO_INT(s) (*((int*)&s))
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 static const char *dummy_hid = "device";
33 * The following ACPI IDs are known to be suitable for representing as
36 static const struct acpi_device_id acpi_platform_device_ids[] = {
40 /* Haswell LPSS devices */
53 static LIST_HEAD(acpi_device_list);
54 static LIST_HEAD(acpi_bus_id_list);
55 static DEFINE_MUTEX(acpi_scan_lock);
56 DEFINE_MUTEX(acpi_device_lock);
57 LIST_HEAD(acpi_wakeup_device_list);
59 struct acpi_device_bus_id{
61 unsigned int instance_no;
62 struct list_head node;
66 * Creates hid/cid(s) string needed for modalias and uevent
67 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
68 * char *modalias: "acpi:IBM0001:ACPI0001"
70 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
75 struct acpi_hardware_id *id;
77 if (list_empty(&acpi_dev->pnp.ids))
80 len = snprintf(modalias, size, "acpi:");
83 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
84 count = snprintf(&modalias[len], size, "%s:", id->id);
85 if (count < 0 || count >= size)
96 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
97 struct acpi_device *acpi_dev = to_acpi_device(dev);
100 /* Device has no HID and no CID or string is >1024 */
101 len = create_modalias(acpi_dev, buf, 1024);
107 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
110 * acpi_bus_hot_remove_device: hot-remove a device and its children
111 * @context: struct acpi_eject_event pointer (freed in this func)
113 * Hot-remove a device and its children. This function frees up the
114 * memory space passed by arg context, so that the caller may call
115 * this function asynchronously through acpi_os_hotplug_execute().
117 void acpi_bus_hot_remove_device(void *context)
119 struct acpi_eject_event *ej_event = (struct acpi_eject_event *) context;
120 struct acpi_device *device = ej_event->device;
121 acpi_handle handle = device->handle;
123 struct acpi_object_list arg_list;
124 union acpi_object arg;
125 acpi_status status = AE_OK;
126 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
128 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
129 "Hot-removing device %s...\n", dev_name(&device->dev)));
131 acpi_bus_trim(device);
132 /* Device node has been released. */
135 /* power off device */
136 status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
137 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
138 printk(KERN_WARNING PREFIX
139 "Power-off device failed\n");
141 if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &temp))) {
143 arg_list.pointer = &arg;
144 arg.type = ACPI_TYPE_INTEGER;
145 arg.integer.value = 0;
146 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
150 arg_list.pointer = &arg;
151 arg.type = ACPI_TYPE_INTEGER;
152 arg.integer.value = 1;
157 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
158 if (ACPI_FAILURE(status)) {
159 if (status != AE_NOT_FOUND)
160 printk(KERN_WARNING PREFIX
161 "Eject device failed\n");
169 /* Inform firmware the hot-remove operation has completed w/ error */
170 (void) acpi_evaluate_hotplug_ost(handle,
171 ej_event->event, ost_code, NULL);
175 EXPORT_SYMBOL(acpi_bus_hot_remove_device);
177 static ssize_t real_power_state_show(struct device *dev,
178 struct device_attribute *attr, char *buf)
180 struct acpi_device *adev = to_acpi_device(dev);
184 ret = acpi_device_get_power(adev, &state);
188 return sprintf(buf, "%s\n", acpi_power_state_string(state));
191 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
193 static ssize_t power_state_show(struct device *dev,
194 struct device_attribute *attr, char *buf)
196 struct acpi_device *adev = to_acpi_device(dev);
198 return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
201 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
204 acpi_eject_store(struct device *d, struct device_attribute *attr,
205 const char *buf, size_t count)
209 acpi_object_type type = 0;
210 struct acpi_device *acpi_device = to_acpi_device(d);
211 struct acpi_eject_event *ej_event;
213 if ((!count) || (buf[0] != '1')) {
217 if (acpi_device->driver == NULL) {
222 status = acpi_get_type(acpi_device->handle, &type);
223 if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
228 ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
234 ej_event->device = acpi_device;
235 if (acpi_device->flags.eject_pending) {
236 /* event originated from ACPI eject notification */
237 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
238 acpi_device->flags.eject_pending = 0;
240 /* event originated from user */
241 ej_event->event = ACPI_OST_EC_OSPM_EJECT;
242 (void) acpi_evaluate_hotplug_ost(acpi_device->handle,
243 ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
246 acpi_os_hotplug_execute(acpi_bus_hot_remove_device, (void *)ej_event);
251 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
254 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
255 struct acpi_device *acpi_dev = to_acpi_device(dev);
257 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
259 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
261 static ssize_t acpi_device_uid_show(struct device *dev,
262 struct device_attribute *attr, char *buf)
264 struct acpi_device *acpi_dev = to_acpi_device(dev);
266 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
268 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
270 static ssize_t acpi_device_adr_show(struct device *dev,
271 struct device_attribute *attr, char *buf)
273 struct acpi_device *acpi_dev = to_acpi_device(dev);
275 return sprintf(buf, "0x%08x\n",
276 (unsigned int)(acpi_dev->pnp.bus_address));
278 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
281 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
282 struct acpi_device *acpi_dev = to_acpi_device(dev);
283 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
286 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
290 result = sprintf(buf, "%s\n", (char*)path.pointer);
295 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
297 /* sysfs file that shows description text from the ACPI _STR method */
298 static ssize_t description_show(struct device *dev,
299 struct device_attribute *attr,
301 struct acpi_device *acpi_dev = to_acpi_device(dev);
304 if (acpi_dev->pnp.str_obj == NULL)
308 * The _STR object contains a Unicode identifier for a device.
309 * We need to convert to utf-8 so it can be displayed.
311 result = utf16s_to_utf8s(
312 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
313 acpi_dev->pnp.str_obj->buffer.length,
314 UTF16_LITTLE_ENDIAN, buf,
317 buf[result++] = '\n';
321 static DEVICE_ATTR(description, 0444, description_show, NULL);
324 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
326 struct acpi_device *acpi_dev = to_acpi_device(dev);
328 return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
330 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
332 static int acpi_device_setup_files(struct acpi_device *dev)
334 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
337 unsigned long long sun;
341 * Devices gotten from FADT don't have a "path" attribute
344 result = device_create_file(&dev->dev, &dev_attr_path);
349 if (!list_empty(&dev->pnp.ids)) {
350 result = device_create_file(&dev->dev, &dev_attr_hid);
354 result = device_create_file(&dev->dev, &dev_attr_modalias);
360 * If device has _STR, 'description' file is created
362 status = acpi_get_handle(dev->handle, "_STR", &temp);
363 if (ACPI_SUCCESS(status)) {
364 status = acpi_evaluate_object(dev->handle, "_STR",
366 if (ACPI_FAILURE(status))
367 buffer.pointer = NULL;
368 dev->pnp.str_obj = buffer.pointer;
369 result = device_create_file(&dev->dev, &dev_attr_description);
374 if (dev->flags.bus_address)
375 result = device_create_file(&dev->dev, &dev_attr_adr);
376 if (dev->pnp.unique_id)
377 result = device_create_file(&dev->dev, &dev_attr_uid);
379 status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
380 if (ACPI_SUCCESS(status)) {
381 dev->pnp.sun = (unsigned long)sun;
382 result = device_create_file(&dev->dev, &dev_attr_sun);
386 dev->pnp.sun = (unsigned long)-1;
390 * If device has _EJ0, 'eject' file is created that is used to trigger
391 * hot-removal function from userland.
393 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
394 if (ACPI_SUCCESS(status)) {
395 result = device_create_file(&dev->dev, &dev_attr_eject);
400 if (dev->flags.power_manageable) {
401 result = device_create_file(&dev->dev, &dev_attr_power_state);
405 if (dev->power.flags.power_resources)
406 result = device_create_file(&dev->dev,
407 &dev_attr_real_power_state);
414 static void acpi_device_remove_files(struct acpi_device *dev)
419 if (dev->flags.power_manageable) {
420 device_remove_file(&dev->dev, &dev_attr_power_state);
421 if (dev->power.flags.power_resources)
422 device_remove_file(&dev->dev,
423 &dev_attr_real_power_state);
427 * If device has _STR, remove 'description' file
429 status = acpi_get_handle(dev->handle, "_STR", &temp);
430 if (ACPI_SUCCESS(status)) {
431 kfree(dev->pnp.str_obj);
432 device_remove_file(&dev->dev, &dev_attr_description);
435 * If device has _EJ0, remove 'eject' file.
437 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
438 if (ACPI_SUCCESS(status))
439 device_remove_file(&dev->dev, &dev_attr_eject);
441 status = acpi_get_handle(dev->handle, "_SUN", &temp);
442 if (ACPI_SUCCESS(status))
443 device_remove_file(&dev->dev, &dev_attr_sun);
445 if (dev->pnp.unique_id)
446 device_remove_file(&dev->dev, &dev_attr_uid);
447 if (dev->flags.bus_address)
448 device_remove_file(&dev->dev, &dev_attr_adr);
449 device_remove_file(&dev->dev, &dev_attr_modalias);
450 device_remove_file(&dev->dev, &dev_attr_hid);
452 device_remove_file(&dev->dev, &dev_attr_path);
454 /* --------------------------------------------------------------------------
456 -------------------------------------------------------------------------- */
458 static const struct acpi_device_id *__acpi_match_device(
459 struct acpi_device *device, const struct acpi_device_id *ids)
461 const struct acpi_device_id *id;
462 struct acpi_hardware_id *hwid;
465 * If the device is not present, it is unnecessary to load device
468 if (!device->status.present)
471 for (id = ids; id->id[0]; id++)
472 list_for_each_entry(hwid, &device->pnp.ids, list)
473 if (!strcmp((char *) id->id, hwid->id))
480 * acpi_match_device - Match a struct device against a given list of ACPI IDs
481 * @ids: Array of struct acpi_device_id object to match against.
482 * @dev: The device structure to match.
484 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
485 * object for that handle and use that object to match against a given list of
488 * Return a pointer to the first matching ID on success or %NULL on failure.
490 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
491 const struct device *dev)
493 struct acpi_device *adev;
494 acpi_handle handle = ACPI_HANDLE(dev);
496 if (!ids || !handle || acpi_bus_get_device(handle, &adev))
499 return __acpi_match_device(adev, ids);
501 EXPORT_SYMBOL_GPL(acpi_match_device);
503 int acpi_match_device_ids(struct acpi_device *device,
504 const struct acpi_device_id *ids)
506 return __acpi_match_device(device, ids) ? 0 : -ENOENT;
508 EXPORT_SYMBOL(acpi_match_device_ids);
510 void acpi_free_ids(struct acpi_device *device)
512 struct acpi_hardware_id *id, *tmp;
514 list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
518 kfree(device->pnp.unique_id);
521 static void acpi_free_power_resources_lists(struct acpi_device *device)
525 if (device->wakeup.flags.valid)
526 acpi_power_resources_list_free(&device->wakeup.resources);
528 if (!device->flags.power_manageable)
531 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
532 struct acpi_device_power_state *ps = &device->power.states[i];
533 acpi_power_resources_list_free(&ps->resources);
537 static void acpi_device_release(struct device *dev)
539 struct acpi_device *acpi_dev = to_acpi_device(dev);
541 acpi_free_ids(acpi_dev);
542 acpi_free_power_resources_lists(acpi_dev);
546 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
548 struct acpi_device *acpi_dev = to_acpi_device(dev);
549 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
551 return acpi_dev->flags.match_driver
552 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
555 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
557 struct acpi_device *acpi_dev = to_acpi_device(dev);
560 if (list_empty(&acpi_dev->pnp.ids))
563 if (add_uevent_var(env, "MODALIAS="))
565 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
566 sizeof(env->buf) - env->buflen);
567 if (len >= (sizeof(env->buf) - env->buflen))
573 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
575 struct acpi_device *device = data;
577 device->driver->ops.notify(device, event);
580 static acpi_status acpi_device_notify_fixed(void *data)
582 struct acpi_device *device = data;
584 /* Fixed hardware devices have no handles */
585 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
589 static int acpi_device_install_notify_handler(struct acpi_device *device)
593 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
595 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
596 acpi_device_notify_fixed,
598 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
600 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
601 acpi_device_notify_fixed,
604 status = acpi_install_notify_handler(device->handle,
609 if (ACPI_FAILURE(status))
614 static void acpi_device_remove_notify_handler(struct acpi_device *device)
616 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
617 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
618 acpi_device_notify_fixed);
619 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
620 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
621 acpi_device_notify_fixed);
623 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
627 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
628 static int acpi_device_probe(struct device * dev)
630 struct acpi_device *acpi_dev = to_acpi_device(dev);
631 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
634 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
636 if (acpi_drv->ops.notify) {
637 ret = acpi_device_install_notify_handler(acpi_dev);
639 if (acpi_drv->ops.remove)
640 acpi_drv->ops.remove(acpi_dev,
641 acpi_dev->removal_type);
646 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
647 "Found driver [%s] for device [%s]\n",
648 acpi_drv->name, acpi_dev->pnp.bus_id));
654 static int acpi_device_remove(struct device * dev)
656 struct acpi_device *acpi_dev = to_acpi_device(dev);
657 struct acpi_driver *acpi_drv = acpi_dev->driver;
660 if (acpi_drv->ops.notify)
661 acpi_device_remove_notify_handler(acpi_dev);
662 if (acpi_drv->ops.remove)
663 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
665 acpi_dev->driver = NULL;
666 acpi_dev->driver_data = NULL;
672 struct bus_type acpi_bus_type = {
674 .match = acpi_bus_match,
675 .probe = acpi_device_probe,
676 .remove = acpi_device_remove,
677 .uevent = acpi_device_uevent,
680 int acpi_device_add(struct acpi_device *device,
681 void (*release)(struct device *))
684 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
687 if (device->handle) {
690 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
692 if (ACPI_FAILURE(status)) {
693 acpi_handle_err(device->handle,
694 "Unable to attach device data\n");
702 * Link this device to its parent and siblings.
704 INIT_LIST_HEAD(&device->children);
705 INIT_LIST_HEAD(&device->node);
706 INIT_LIST_HEAD(&device->wakeup_list);
707 INIT_LIST_HEAD(&device->physical_node_list);
708 mutex_init(&device->physical_node_lock);
709 INIT_LIST_HEAD(&device->power_dependent);
711 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
713 pr_err(PREFIX "Memory allocation error\n");
718 mutex_lock(&acpi_device_lock);
720 * Find suitable bus_id and instance number in acpi_bus_id_list
721 * If failed, create one and link it into acpi_bus_id_list
723 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
724 if (!strcmp(acpi_device_bus_id->bus_id,
725 acpi_device_hid(device))) {
726 acpi_device_bus_id->instance_no++;
733 acpi_device_bus_id = new_bus_id;
734 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
735 acpi_device_bus_id->instance_no = 0;
736 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
738 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
741 list_add_tail(&device->node, &device->parent->children);
743 if (device->wakeup.flags.valid)
744 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
745 mutex_unlock(&acpi_device_lock);
748 device->dev.parent = &device->parent->dev;
749 device->dev.bus = &acpi_bus_type;
750 device->dev.release = release;
751 result = device_add(&device->dev);
753 dev_err(&device->dev, "Error registering device\n");
757 result = acpi_device_setup_files(device);
759 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
760 dev_name(&device->dev));
762 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
766 mutex_lock(&acpi_device_lock);
768 list_del(&device->node);
769 list_del(&device->wakeup_list);
770 mutex_unlock(&acpi_device_lock);
773 acpi_detach_data(device->handle, acpi_bus_data_handler);
777 static void acpi_device_unregister(struct acpi_device *device)
779 mutex_lock(&acpi_device_lock);
781 list_del(&device->node);
783 list_del(&device->wakeup_list);
784 mutex_unlock(&acpi_device_lock);
786 acpi_detach_data(device->handle, acpi_bus_data_handler);
788 acpi_power_add_remove_device(device, false);
789 acpi_device_remove_files(device);
791 device->remove(device);
793 device_del(&device->dev);
795 * Drop the reference counts of all power resources the device depends
796 * on and turn off the ones that have no more references.
798 acpi_power_transition(device, ACPI_STATE_D3_COLD);
799 put_device(&device->dev);
802 /* --------------------------------------------------------------------------
804 -------------------------------------------------------------------------- */
806 * acpi_bus_driver_init - add a device to a driver
807 * @device: the device to add and initialize
808 * @driver: driver for the device
810 * Used to initialize a device via its device driver. Called whenever a
811 * driver is bound to a device. Invokes the driver's add() ops.
814 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
818 if (!device || !driver)
821 if (!driver->ops.add)
824 result = driver->ops.add(device);
826 device->driver = NULL;
827 device->driver_data = NULL;
831 device->driver = driver;
834 * TBD - Configuration Management: Assign resources to device based
835 * upon possible configuration and currently allocated resources.
838 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
839 "Driver successfully bound to device\n"));
844 * acpi_bus_register_driver - register a driver with the ACPI bus
845 * @driver: driver being registered
847 * Registers a driver with the ACPI bus. Searches the namespace for all
848 * devices that match the driver's criteria and binds. Returns zero for
849 * success or a negative error status for failure.
851 int acpi_bus_register_driver(struct acpi_driver *driver)
857 driver->drv.name = driver->name;
858 driver->drv.bus = &acpi_bus_type;
859 driver->drv.owner = driver->owner;
861 ret = driver_register(&driver->drv);
865 EXPORT_SYMBOL(acpi_bus_register_driver);
868 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
869 * @driver: driver to unregister
871 * Unregisters a driver with the ACPI bus. Searches the namespace for all
872 * devices that match the driver's criteria and unbinds.
874 void acpi_bus_unregister_driver(struct acpi_driver *driver)
876 driver_unregister(&driver->drv);
879 EXPORT_SYMBOL(acpi_bus_unregister_driver);
881 /* --------------------------------------------------------------------------
883 -------------------------------------------------------------------------- */
884 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
888 struct acpi_device *device;
891 * Fixed hardware devices do not appear in the namespace and do not
892 * have handles, but we fabricate acpi_devices for them, so we have
893 * to deal with them specially.
899 status = acpi_get_parent(handle, &handle);
900 if (status == AE_NULL_ENTRY)
902 if (ACPI_FAILURE(status))
905 ret = acpi_bus_get_device(handle, &device);
912 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
916 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
917 union acpi_object *obj;
919 status = acpi_get_handle(handle, "_EJD", &tmp);
920 if (ACPI_FAILURE(status))
923 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
924 if (ACPI_SUCCESS(status)) {
925 obj = buffer.pointer;
926 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
928 kfree(buffer.pointer);
932 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
934 void acpi_bus_data_handler(acpi_handle handle, void *context)
942 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
943 struct acpi_device_wakeup *wakeup)
945 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
946 union acpi_object *package = NULL;
947 union acpi_object *element = NULL;
954 INIT_LIST_HEAD(&wakeup->resources);
957 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
958 if (ACPI_FAILURE(status)) {
959 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
963 package = (union acpi_object *)buffer.pointer;
965 if (!package || package->package.count < 2)
968 element = &(package->package.elements[0]);
972 if (element->type == ACPI_TYPE_PACKAGE) {
973 if ((element->package.count < 2) ||
974 (element->package.elements[0].type !=
975 ACPI_TYPE_LOCAL_REFERENCE)
976 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
980 element->package.elements[0].reference.handle;
982 (u32) element->package.elements[1].integer.value;
983 } else if (element->type == ACPI_TYPE_INTEGER) {
984 wakeup->gpe_device = NULL;
985 wakeup->gpe_number = element->integer.value;
990 element = &(package->package.elements[1]);
991 if (element->type != ACPI_TYPE_INTEGER)
994 wakeup->sleep_state = element->integer.value;
996 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1000 if (!list_empty(&wakeup->resources)) {
1003 sleep_state = acpi_power_min_system_level(&wakeup->resources);
1004 if (sleep_state < wakeup->sleep_state) {
1005 acpi_handle_warn(handle, "Overriding _PRW sleep state "
1006 "(S%d) by S%d from power resources\n",
1007 (int)wakeup->sleep_state, sleep_state);
1008 wakeup->sleep_state = sleep_state;
1011 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1014 kfree(buffer.pointer);
1018 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1020 struct acpi_device_id button_device_ids[] = {
1027 acpi_event_status event_status;
1029 device->wakeup.flags.notifier_present = 0;
1031 /* Power button, Lid switch always enable wakeup */
1032 if (!acpi_match_device_ids(device, button_device_ids)) {
1033 device->wakeup.flags.run_wake = 1;
1034 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1035 /* Do not use Lid/sleep button for S5 wakeup */
1036 if (device->wakeup.sleep_state == ACPI_STATE_S5)
1037 device->wakeup.sleep_state = ACPI_STATE_S4;
1039 device_set_wakeup_capable(&device->dev, true);
1043 status = acpi_get_gpe_status(device->wakeup.gpe_device,
1044 device->wakeup.gpe_number,
1046 if (status == AE_OK)
1047 device->wakeup.flags.run_wake =
1048 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1051 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1054 acpi_status status = 0;
1057 /* Presence of _PRW indicates wake capable */
1058 status = acpi_get_handle(device->handle, "_PRW", &temp);
1059 if (ACPI_FAILURE(status))
1062 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1065 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1069 device->wakeup.flags.valid = 1;
1070 device->wakeup.prepare_count = 0;
1071 acpi_bus_set_run_wake_flags(device);
1072 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1073 * system for the ACPI device with the _PRW object.
1074 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1075 * So it is necessary to call _DSW object first. Only when it is not
1076 * present will the _PSW object used.
1078 err = acpi_device_sleep_wake(device, 0, 0, 0);
1080 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1081 "error in _DSW or _PSW evaluation\n"));
1084 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1086 struct acpi_device_power_state *ps = &device->power.states[state];
1087 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1088 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1092 INIT_LIST_HEAD(&ps->resources);
1094 /* Evaluate "_PRx" to get referenced power resources */
1095 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1096 if (ACPI_SUCCESS(status)) {
1097 union acpi_object *package = buffer.pointer;
1099 if (buffer.length && package
1100 && package->type == ACPI_TYPE_PACKAGE
1101 && package->package.count) {
1102 int err = acpi_extract_power_resources(package, 0,
1105 device->power.flags.power_resources = 1;
1107 ACPI_FREE(buffer.pointer);
1110 /* Evaluate "_PSx" to see if we can do explicit sets */
1112 status = acpi_get_handle(device->handle, pathname, &handle);
1113 if (ACPI_SUCCESS(status))
1114 ps->flags.explicit_set = 1;
1117 * State is valid if there are means to put the device into it.
1118 * D3hot is only valid if _PR3 present.
1120 if (!list_empty(&ps->resources)
1121 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1122 ps->flags.valid = 1;
1123 ps->flags.os_accessible = 1;
1126 ps->power = -1; /* Unknown - driver assigned */
1127 ps->latency = -1; /* Unknown - driver assigned */
1130 static void acpi_bus_get_power_flags(struct acpi_device *device)
1136 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1137 status = acpi_get_handle(device->handle, "_PS0", &handle);
1138 if (ACPI_FAILURE(status)) {
1139 status = acpi_get_handle(device->handle, "_PR0", &handle);
1140 if (ACPI_FAILURE(status))
1144 device->flags.power_manageable = 1;
1147 * Power Management Flags
1149 status = acpi_get_handle(device->handle, "_PSC", &handle);
1150 if (ACPI_SUCCESS(status))
1151 device->power.flags.explicit_get = 1;
1152 status = acpi_get_handle(device->handle, "_IRC", &handle);
1153 if (ACPI_SUCCESS(status))
1154 device->power.flags.inrush_current = 1;
1157 * Enumerate supported power management states
1159 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1160 acpi_bus_init_power_state(device, i);
1162 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1164 /* Set defaults for D0 and D3 states (always valid) */
1165 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1166 device->power.states[ACPI_STATE_D0].power = 100;
1167 device->power.states[ACPI_STATE_D3].flags.valid = 1;
1168 device->power.states[ACPI_STATE_D3].power = 0;
1170 /* Set D3cold's explicit_set flag if _PS3 exists. */
1171 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1172 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1174 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1175 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1176 device->power.flags.power_resources)
1177 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1179 if (acpi_bus_init_power(device)) {
1180 acpi_free_power_resources_lists(device);
1181 device->flags.power_manageable = 0;
1185 static void acpi_bus_get_flags(struct acpi_device *device)
1187 acpi_status status = AE_OK;
1188 acpi_handle temp = NULL;
1190 /* Presence of _STA indicates 'dynamic_status' */
1191 status = acpi_get_handle(device->handle, "_STA", &temp);
1192 if (ACPI_SUCCESS(status))
1193 device->flags.dynamic_status = 1;
1195 /* Presence of _RMV indicates 'removable' */
1196 status = acpi_get_handle(device->handle, "_RMV", &temp);
1197 if (ACPI_SUCCESS(status))
1198 device->flags.removable = 1;
1200 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1201 status = acpi_get_handle(device->handle, "_EJD", &temp);
1202 if (ACPI_SUCCESS(status))
1203 device->flags.ejectable = 1;
1205 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1206 if (ACPI_SUCCESS(status))
1207 device->flags.ejectable = 1;
1211 static void acpi_device_get_busid(struct acpi_device *device)
1213 char bus_id[5] = { '?', 0 };
1214 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1220 * The device's Bus ID is simply the object name.
1221 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1223 if (ACPI_IS_ROOT_DEVICE(device)) {
1224 strcpy(device->pnp.bus_id, "ACPI");
1228 switch (device->device_type) {
1229 case ACPI_BUS_TYPE_POWER_BUTTON:
1230 strcpy(device->pnp.bus_id, "PWRF");
1232 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1233 strcpy(device->pnp.bus_id, "SLPF");
1236 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1237 /* Clean up trailing underscores (if any) */
1238 for (i = 3; i > 1; i--) {
1239 if (bus_id[i] == '_')
1244 strcpy(device->pnp.bus_id, bus_id);
1250 * acpi_bay_match - see if a device is an ejectable driver bay
1252 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1253 * then we can safely call it an ejectable drive bay
1255 static int acpi_bay_match(struct acpi_device *device){
1259 acpi_handle phandle;
1261 handle = device->handle;
1263 status = acpi_get_handle(handle, "_EJ0", &tmp);
1264 if (ACPI_FAILURE(status))
1267 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1268 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1269 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1270 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1273 if (acpi_get_parent(handle, &phandle))
1276 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1277 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1278 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1279 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1286 * acpi_dock_match - see if a device has a _DCK method
1288 static int acpi_dock_match(struct acpi_device *device)
1291 return acpi_get_handle(device->handle, "_DCK", &tmp);
1294 const char *acpi_device_hid(struct acpi_device *device)
1296 struct acpi_hardware_id *hid;
1298 if (list_empty(&device->pnp.ids))
1301 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1304 EXPORT_SYMBOL(acpi_device_hid);
1306 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1308 struct acpi_hardware_id *id;
1310 id = kmalloc(sizeof(*id), GFP_KERNEL);
1314 id->id = kstrdup(dev_id, GFP_KERNEL);
1320 list_add_tail(&id->list, &device->pnp.ids);
1324 * Old IBM workstations have a DSDT bug wherein the SMBus object
1325 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1326 * prefix. Work around this.
1328 static int acpi_ibm_smbus_match(struct acpi_device *device)
1330 acpi_handle h_dummy;
1331 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1334 if (!dmi_name_in_vendors("IBM"))
1337 /* Look for SMBS object */
1338 result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1342 if (strcmp("SMBS", path.pointer)) {
1347 /* Does it have the necessary (but misnamed) methods? */
1349 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1350 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1351 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1354 kfree(path.pointer);
1358 static void acpi_device_set_id(struct acpi_device *device)
1361 struct acpi_device_info *info;
1362 struct acpi_pnp_device_id_list *cid_list;
1365 switch (device->device_type) {
1366 case ACPI_BUS_TYPE_DEVICE:
1367 if (ACPI_IS_ROOT_DEVICE(device)) {
1368 acpi_add_id(device, ACPI_SYSTEM_HID);
1372 status = acpi_get_object_info(device->handle, &info);
1373 if (ACPI_FAILURE(status)) {
1374 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1378 if (info->valid & ACPI_VALID_HID)
1379 acpi_add_id(device, info->hardware_id.string);
1380 if (info->valid & ACPI_VALID_CID) {
1381 cid_list = &info->compatible_id_list;
1382 for (i = 0; i < cid_list->count; i++)
1383 acpi_add_id(device, cid_list->ids[i].string);
1385 if (info->valid & ACPI_VALID_ADR) {
1386 device->pnp.bus_address = info->address;
1387 device->flags.bus_address = 1;
1389 if (info->valid & ACPI_VALID_UID)
1390 device->pnp.unique_id = kstrdup(info->unique_id.string,
1396 * Some devices don't reliably have _HIDs & _CIDs, so add
1397 * synthetic HIDs to make sure drivers can find them.
1399 if (acpi_is_video_device(device))
1400 acpi_add_id(device, ACPI_VIDEO_HID);
1401 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1402 acpi_add_id(device, ACPI_BAY_HID);
1403 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1404 acpi_add_id(device, ACPI_DOCK_HID);
1405 else if (!acpi_ibm_smbus_match(device))
1406 acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1407 else if (list_empty(&device->pnp.ids) &&
1408 ACPI_IS_ROOT_DEVICE(device->parent)) {
1409 acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1410 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1411 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1415 case ACPI_BUS_TYPE_POWER:
1416 acpi_add_id(device, ACPI_POWER_HID);
1418 case ACPI_BUS_TYPE_PROCESSOR:
1419 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1421 case ACPI_BUS_TYPE_THERMAL:
1422 acpi_add_id(device, ACPI_THERMAL_HID);
1424 case ACPI_BUS_TYPE_POWER_BUTTON:
1425 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1427 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1428 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1433 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1434 int type, unsigned long long sta)
1436 INIT_LIST_HEAD(&device->pnp.ids);
1437 device->device_type = type;
1438 device->handle = handle;
1439 device->parent = acpi_bus_get_parent(handle);
1440 STRUCT_TO_INT(device->status) = sta;
1441 acpi_device_get_busid(device);
1442 acpi_device_set_id(device);
1443 acpi_bus_get_flags(device);
1444 device_initialize(&device->dev);
1445 dev_set_uevent_suppress(&device->dev, true);
1448 void acpi_device_add_finalize(struct acpi_device *device)
1450 dev_set_uevent_suppress(&device->dev, false);
1451 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1454 static int acpi_add_single_object(struct acpi_device **child,
1455 acpi_handle handle, int type,
1456 unsigned long long sta, bool match_driver)
1459 struct acpi_device *device;
1460 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1462 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1464 printk(KERN_ERR PREFIX "Memory allocation error\n");
1468 acpi_init_device_object(device, handle, type, sta);
1469 acpi_bus_get_power_flags(device);
1470 acpi_bus_get_wakeup_device_flags(device);
1472 device->flags.match_driver = match_driver;
1473 result = acpi_device_add(device, acpi_device_release);
1475 acpi_device_release(&device->dev);
1479 acpi_power_add_remove_device(device, true);
1480 acpi_device_add_finalize(device);
1481 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1482 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1483 dev_name(&device->dev), (char *) buffer.pointer,
1484 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1485 kfree(buffer.pointer);
1490 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1491 unsigned long long *sta)
1494 acpi_object_type acpi_type;
1496 status = acpi_get_type(handle, &acpi_type);
1497 if (ACPI_FAILURE(status))
1500 switch (acpi_type) {
1501 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1502 case ACPI_TYPE_DEVICE:
1503 *type = ACPI_BUS_TYPE_DEVICE;
1504 status = acpi_bus_get_status_handle(handle, sta);
1505 if (ACPI_FAILURE(status))
1508 case ACPI_TYPE_PROCESSOR:
1509 *type = ACPI_BUS_TYPE_PROCESSOR;
1510 status = acpi_bus_get_status_handle(handle, sta);
1511 if (ACPI_FAILURE(status))
1514 case ACPI_TYPE_THERMAL:
1515 *type = ACPI_BUS_TYPE_THERMAL;
1516 *sta = ACPI_STA_DEFAULT;
1518 case ACPI_TYPE_POWER:
1519 *type = ACPI_BUS_TYPE_POWER;
1520 *sta = ACPI_STA_DEFAULT;
1529 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1530 void *not_used, void **return_value)
1532 struct acpi_device *device = NULL;
1534 unsigned long long sta;
1538 acpi_bus_get_device(handle, &device);
1542 result = acpi_bus_type_and_status(handle, &type, &sta);
1546 if (type == ACPI_BUS_TYPE_POWER) {
1547 acpi_add_power_resource(handle);
1551 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1552 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1553 struct acpi_device_wakeup wakeup;
1556 status = acpi_get_handle(handle, "_PRW", &temp);
1557 if (ACPI_SUCCESS(status)) {
1558 acpi_bus_extract_wakeup_device_power_package(handle,
1560 acpi_power_resources_list_free(&wakeup.resources);
1562 return AE_CTRL_DEPTH;
1565 acpi_add_single_object(&device, handle, type, sta, false);
1567 return AE_CTRL_DEPTH;
1569 device->flags.match_driver = true;
1573 *return_value = device;
1578 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1579 void *not_used, void **ret_not_used)
1581 acpi_status status = AE_OK;
1582 struct acpi_device *device;
1583 unsigned long long sta_not_used;
1587 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1588 * namespace walks prematurely.
1590 if (acpi_bus_type_and_status(handle, &type_not_used, &sta_not_used))
1593 if (acpi_bus_get_device(handle, &device))
1594 return AE_CTRL_DEPTH;
1596 if (!acpi_match_device_ids(device, acpi_platform_device_ids)) {
1597 /* This is a known good platform device. */
1598 acpi_create_platform_device(device);
1599 } else if (device_attach(&device->dev) < 0) {
1600 status = AE_CTRL_DEPTH;
1606 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1607 * @handle: Root of the namespace scope to scan.
1609 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1612 * If no devices were found, -ENODEV is returned, but it does not mean that
1613 * there has been a real error. There just have been no suitable ACPI objects
1614 * in the table trunk from which the kernel could create a device and add an
1615 * appropriate driver.
1617 int acpi_bus_scan(acpi_handle handle)
1619 void *device = NULL;
1622 mutex_lock(&acpi_scan_lock);
1624 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1625 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1626 acpi_bus_check_add, NULL, NULL, &device);
1630 else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1631 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1632 acpi_bus_device_attach, NULL, NULL, NULL);
1634 mutex_unlock(&acpi_scan_lock);
1637 EXPORT_SYMBOL(acpi_bus_scan);
1639 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1640 void *not_used, void **ret_not_used)
1642 struct acpi_device *device = NULL;
1644 if (!acpi_bus_get_device(handle, &device)) {
1645 device->removal_type = ACPI_BUS_REMOVAL_EJECT;
1646 device_release_driver(&device->dev);
1651 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1652 void *not_used, void **ret_not_used)
1654 struct acpi_device *device = NULL;
1656 if (!acpi_bus_get_device(handle, &device))
1657 acpi_device_unregister(device);
1662 void acpi_bus_trim(struct acpi_device *start)
1664 mutex_lock(&acpi_scan_lock);
1667 * Execute acpi_bus_device_detach() as a post-order callback to detach
1668 * all ACPI drivers from the device nodes being removed.
1670 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1671 acpi_bus_device_detach, NULL, NULL);
1672 acpi_bus_device_detach(start->handle, 0, NULL, NULL);
1674 * Execute acpi_bus_remove() as a post-order callback to remove device
1675 * nodes in the given namespace scope.
1677 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1678 acpi_bus_remove, NULL, NULL);
1679 acpi_bus_remove(start->handle, 0, NULL, NULL);
1681 mutex_unlock(&acpi_scan_lock);
1683 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1685 static int acpi_bus_scan_fixed(void)
1688 struct acpi_device *device = NULL;
1691 * Enumerate all fixed-feature devices.
1693 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1694 result = acpi_add_single_object(&device, NULL,
1695 ACPI_BUS_TYPE_POWER_BUTTON,
1696 ACPI_STA_DEFAULT, true);
1697 device_init_wakeup(&device->dev, true);
1700 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1701 result = acpi_add_single_object(&device, NULL,
1702 ACPI_BUS_TYPE_SLEEP_BUTTON,
1703 ACPI_STA_DEFAULT, true);
1709 int __init acpi_scan_init(void)
1713 result = bus_register(&acpi_bus_type);
1715 /* We don't want to quit even if we failed to add suspend/resume */
1716 printk(KERN_ERR PREFIX "Could not register bus type\n");
1719 acpi_pci_root_init();
1722 * Enumerate devices in the ACPI namespace.
1724 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
1728 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
1732 result = acpi_bus_scan_fixed();
1734 acpi_device_unregister(acpi_root);
1738 acpi_update_all_gpes();