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;
495 if (!ids || !ACPI_HANDLE(dev)
496 || ACPI_FAILURE(acpi_bus_get_device(ACPI_HANDLE(dev), &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);
645 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
646 "Found driver [%s] for device [%s]\n",
647 acpi_drv->name, acpi_dev->pnp.bus_id));
653 static int acpi_device_remove(struct device * dev)
655 struct acpi_device *acpi_dev = to_acpi_device(dev);
656 struct acpi_driver *acpi_drv = acpi_dev->driver;
659 if (acpi_drv->ops.notify)
660 acpi_device_remove_notify_handler(acpi_dev);
661 if (acpi_drv->ops.remove)
662 acpi_drv->ops.remove(acpi_dev);
664 acpi_dev->driver = NULL;
665 acpi_dev->driver_data = NULL;
671 struct bus_type acpi_bus_type = {
673 .match = acpi_bus_match,
674 .probe = acpi_device_probe,
675 .remove = acpi_device_remove,
676 .uevent = acpi_device_uevent,
679 int acpi_device_add(struct acpi_device *device,
680 void (*release)(struct device *))
683 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
686 if (device->handle) {
689 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
691 if (ACPI_FAILURE(status)) {
692 acpi_handle_err(device->handle,
693 "Unable to attach device data\n");
701 * Link this device to its parent and siblings.
703 INIT_LIST_HEAD(&device->children);
704 INIT_LIST_HEAD(&device->node);
705 INIT_LIST_HEAD(&device->wakeup_list);
706 INIT_LIST_HEAD(&device->physical_node_list);
707 mutex_init(&device->physical_node_lock);
708 INIT_LIST_HEAD(&device->power_dependent);
710 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
712 pr_err(PREFIX "Memory allocation error\n");
717 mutex_lock(&acpi_device_lock);
719 * Find suitable bus_id and instance number in acpi_bus_id_list
720 * If failed, create one and link it into acpi_bus_id_list
722 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
723 if (!strcmp(acpi_device_bus_id->bus_id,
724 acpi_device_hid(device))) {
725 acpi_device_bus_id->instance_no++;
732 acpi_device_bus_id = new_bus_id;
733 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
734 acpi_device_bus_id->instance_no = 0;
735 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
737 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
740 list_add_tail(&device->node, &device->parent->children);
742 if (device->wakeup.flags.valid)
743 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
744 mutex_unlock(&acpi_device_lock);
747 device->dev.parent = &device->parent->dev;
748 device->dev.bus = &acpi_bus_type;
749 device->dev.release = release;
750 result = device_add(&device->dev);
752 dev_err(&device->dev, "Error registering device\n");
756 result = acpi_device_setup_files(device);
758 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
759 dev_name(&device->dev));
761 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
765 mutex_lock(&acpi_device_lock);
767 list_del(&device->node);
768 list_del(&device->wakeup_list);
769 mutex_unlock(&acpi_device_lock);
772 acpi_detach_data(device->handle, acpi_bus_data_handler);
776 static void acpi_device_unregister(struct acpi_device *device)
778 mutex_lock(&acpi_device_lock);
780 list_del(&device->node);
782 list_del(&device->wakeup_list);
783 mutex_unlock(&acpi_device_lock);
785 acpi_detach_data(device->handle, acpi_bus_data_handler);
787 acpi_power_add_remove_device(device, false);
788 acpi_device_remove_files(device);
790 device->remove(device);
792 device_del(&device->dev);
794 * Drop the reference counts of all power resources the device depends
795 * on and turn off the ones that have no more references.
797 acpi_power_transition(device, ACPI_STATE_D3_COLD);
798 put_device(&device->dev);
801 /* --------------------------------------------------------------------------
803 -------------------------------------------------------------------------- */
805 * acpi_bus_driver_init - add a device to a driver
806 * @device: the device to add and initialize
807 * @driver: driver for the device
809 * Used to initialize a device via its device driver. Called whenever a
810 * driver is bound to a device. Invokes the driver's add() ops.
813 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
817 if (!device || !driver)
820 if (!driver->ops.add)
823 result = driver->ops.add(device);
825 device->driver = NULL;
826 device->driver_data = NULL;
830 device->driver = driver;
833 * TBD - Configuration Management: Assign resources to device based
834 * upon possible configuration and currently allocated resources.
837 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
838 "Driver successfully bound to device\n"));
843 * acpi_bus_register_driver - register a driver with the ACPI bus
844 * @driver: driver being registered
846 * Registers a driver with the ACPI bus. Searches the namespace for all
847 * devices that match the driver's criteria and binds. Returns zero for
848 * success or a negative error status for failure.
850 int acpi_bus_register_driver(struct acpi_driver *driver)
856 driver->drv.name = driver->name;
857 driver->drv.bus = &acpi_bus_type;
858 driver->drv.owner = driver->owner;
860 ret = driver_register(&driver->drv);
864 EXPORT_SYMBOL(acpi_bus_register_driver);
867 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
868 * @driver: driver to unregister
870 * Unregisters a driver with the ACPI bus. Searches the namespace for all
871 * devices that match the driver's criteria and unbinds.
873 void acpi_bus_unregister_driver(struct acpi_driver *driver)
875 driver_unregister(&driver->drv);
878 EXPORT_SYMBOL(acpi_bus_unregister_driver);
880 /* --------------------------------------------------------------------------
882 -------------------------------------------------------------------------- */
883 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
887 struct acpi_device *device;
890 * Fixed hardware devices do not appear in the namespace and do not
891 * have handles, but we fabricate acpi_devices for them, so we have
892 * to deal with them specially.
898 status = acpi_get_parent(handle, &handle);
899 if (status == AE_NULL_ENTRY)
901 if (ACPI_FAILURE(status))
904 ret = acpi_bus_get_device(handle, &device);
911 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
915 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
916 union acpi_object *obj;
918 status = acpi_get_handle(handle, "_EJD", &tmp);
919 if (ACPI_FAILURE(status))
922 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
923 if (ACPI_SUCCESS(status)) {
924 obj = buffer.pointer;
925 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
927 kfree(buffer.pointer);
931 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
933 void acpi_bus_data_handler(acpi_handle handle, void *context)
941 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
942 struct acpi_device_wakeup *wakeup)
944 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
945 union acpi_object *package = NULL;
946 union acpi_object *element = NULL;
953 INIT_LIST_HEAD(&wakeup->resources);
956 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
957 if (ACPI_FAILURE(status)) {
958 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
962 package = (union acpi_object *)buffer.pointer;
964 if (!package || package->package.count < 2)
967 element = &(package->package.elements[0]);
971 if (element->type == ACPI_TYPE_PACKAGE) {
972 if ((element->package.count < 2) ||
973 (element->package.elements[0].type !=
974 ACPI_TYPE_LOCAL_REFERENCE)
975 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
979 element->package.elements[0].reference.handle;
981 (u32) element->package.elements[1].integer.value;
982 } else if (element->type == ACPI_TYPE_INTEGER) {
983 wakeup->gpe_device = NULL;
984 wakeup->gpe_number = element->integer.value;
989 element = &(package->package.elements[1]);
990 if (element->type != ACPI_TYPE_INTEGER)
993 wakeup->sleep_state = element->integer.value;
995 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
999 if (!list_empty(&wakeup->resources)) {
1002 sleep_state = acpi_power_min_system_level(&wakeup->resources);
1003 if (sleep_state < wakeup->sleep_state) {
1004 acpi_handle_warn(handle, "Overriding _PRW sleep state "
1005 "(S%d) by S%d from power resources\n",
1006 (int)wakeup->sleep_state, sleep_state);
1007 wakeup->sleep_state = sleep_state;
1010 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1013 kfree(buffer.pointer);
1017 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1019 struct acpi_device_id button_device_ids[] = {
1026 acpi_event_status event_status;
1028 device->wakeup.flags.notifier_present = 0;
1030 /* Power button, Lid switch always enable wakeup */
1031 if (!acpi_match_device_ids(device, button_device_ids)) {
1032 device->wakeup.flags.run_wake = 1;
1033 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1034 /* Do not use Lid/sleep button for S5 wakeup */
1035 if (device->wakeup.sleep_state == ACPI_STATE_S5)
1036 device->wakeup.sleep_state = ACPI_STATE_S4;
1038 device_set_wakeup_capable(&device->dev, true);
1042 status = acpi_get_gpe_status(device->wakeup.gpe_device,
1043 device->wakeup.gpe_number,
1045 if (status == AE_OK)
1046 device->wakeup.flags.run_wake =
1047 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1050 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1053 acpi_status status = 0;
1056 /* Presence of _PRW indicates wake capable */
1057 status = acpi_get_handle(device->handle, "_PRW", &temp);
1058 if (ACPI_FAILURE(status))
1061 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1064 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1068 device->wakeup.flags.valid = 1;
1069 device->wakeup.prepare_count = 0;
1070 acpi_bus_set_run_wake_flags(device);
1071 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1072 * system for the ACPI device with the _PRW object.
1073 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1074 * So it is necessary to call _DSW object first. Only when it is not
1075 * present will the _PSW object used.
1077 err = acpi_device_sleep_wake(device, 0, 0, 0);
1079 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1080 "error in _DSW or _PSW evaluation\n"));
1083 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1085 struct acpi_device_power_state *ps = &device->power.states[state];
1086 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1087 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1091 INIT_LIST_HEAD(&ps->resources);
1093 /* Evaluate "_PRx" to get referenced power resources */
1094 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1095 if (ACPI_SUCCESS(status)) {
1096 union acpi_object *package = buffer.pointer;
1098 if (buffer.length && package
1099 && package->type == ACPI_TYPE_PACKAGE
1100 && package->package.count) {
1101 int err = acpi_extract_power_resources(package, 0,
1104 device->power.flags.power_resources = 1;
1106 ACPI_FREE(buffer.pointer);
1109 /* Evaluate "_PSx" to see if we can do explicit sets */
1111 status = acpi_get_handle(device->handle, pathname, &handle);
1112 if (ACPI_SUCCESS(status))
1113 ps->flags.explicit_set = 1;
1116 * State is valid if there are means to put the device into it.
1117 * D3hot is only valid if _PR3 present.
1119 if (!list_empty(&ps->resources)
1120 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1121 ps->flags.valid = 1;
1122 ps->flags.os_accessible = 1;
1125 ps->power = -1; /* Unknown - driver assigned */
1126 ps->latency = -1; /* Unknown - driver assigned */
1129 static void acpi_bus_get_power_flags(struct acpi_device *device)
1135 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1136 status = acpi_get_handle(device->handle, "_PS0", &handle);
1137 if (ACPI_FAILURE(status)) {
1138 status = acpi_get_handle(device->handle, "_PR0", &handle);
1139 if (ACPI_FAILURE(status))
1143 device->flags.power_manageable = 1;
1146 * Power Management Flags
1148 status = acpi_get_handle(device->handle, "_PSC", &handle);
1149 if (ACPI_SUCCESS(status))
1150 device->power.flags.explicit_get = 1;
1151 status = acpi_get_handle(device->handle, "_IRC", &handle);
1152 if (ACPI_SUCCESS(status))
1153 device->power.flags.inrush_current = 1;
1156 * Enumerate supported power management states
1158 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1159 acpi_bus_init_power_state(device, i);
1161 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1163 /* Set defaults for D0 and D3 states (always valid) */
1164 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1165 device->power.states[ACPI_STATE_D0].power = 100;
1166 device->power.states[ACPI_STATE_D3].flags.valid = 1;
1167 device->power.states[ACPI_STATE_D3].power = 0;
1169 /* Set D3cold's explicit_set flag if _PS3 exists. */
1170 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1171 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1173 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1174 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1175 device->power.flags.power_resources)
1176 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1178 acpi_bus_init_power(device);
1181 static void acpi_bus_get_flags(struct acpi_device *device)
1183 acpi_status status = AE_OK;
1184 acpi_handle temp = NULL;
1186 /* Presence of _STA indicates 'dynamic_status' */
1187 status = acpi_get_handle(device->handle, "_STA", &temp);
1188 if (ACPI_SUCCESS(status))
1189 device->flags.dynamic_status = 1;
1191 /* Presence of _RMV indicates 'removable' */
1192 status = acpi_get_handle(device->handle, "_RMV", &temp);
1193 if (ACPI_SUCCESS(status))
1194 device->flags.removable = 1;
1196 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1197 status = acpi_get_handle(device->handle, "_EJD", &temp);
1198 if (ACPI_SUCCESS(status))
1199 device->flags.ejectable = 1;
1201 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1202 if (ACPI_SUCCESS(status))
1203 device->flags.ejectable = 1;
1207 static void acpi_device_get_busid(struct acpi_device *device)
1209 char bus_id[5] = { '?', 0 };
1210 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1216 * The device's Bus ID is simply the object name.
1217 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1219 if (ACPI_IS_ROOT_DEVICE(device)) {
1220 strcpy(device->pnp.bus_id, "ACPI");
1224 switch (device->device_type) {
1225 case ACPI_BUS_TYPE_POWER_BUTTON:
1226 strcpy(device->pnp.bus_id, "PWRF");
1228 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1229 strcpy(device->pnp.bus_id, "SLPF");
1232 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1233 /* Clean up trailing underscores (if any) */
1234 for (i = 3; i > 1; i--) {
1235 if (bus_id[i] == '_')
1240 strcpy(device->pnp.bus_id, bus_id);
1246 * acpi_bay_match - see if a device is an ejectable driver bay
1248 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1249 * then we can safely call it an ejectable drive bay
1251 static int acpi_bay_match(struct acpi_device *device){
1255 acpi_handle phandle;
1257 handle = device->handle;
1259 status = acpi_get_handle(handle, "_EJ0", &tmp);
1260 if (ACPI_FAILURE(status))
1263 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1264 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1265 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1266 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1269 if (acpi_get_parent(handle, &phandle))
1272 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1273 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1274 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1275 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1282 * acpi_dock_match - see if a device has a _DCK method
1284 static int acpi_dock_match(struct acpi_device *device)
1287 return acpi_get_handle(device->handle, "_DCK", &tmp);
1290 const char *acpi_device_hid(struct acpi_device *device)
1292 struct acpi_hardware_id *hid;
1294 if (list_empty(&device->pnp.ids))
1297 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1300 EXPORT_SYMBOL(acpi_device_hid);
1302 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1304 struct acpi_hardware_id *id;
1306 id = kmalloc(sizeof(*id), GFP_KERNEL);
1310 id->id = kstrdup(dev_id, GFP_KERNEL);
1316 list_add_tail(&id->list, &device->pnp.ids);
1320 * Old IBM workstations have a DSDT bug wherein the SMBus object
1321 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1322 * prefix. Work around this.
1324 static int acpi_ibm_smbus_match(struct acpi_device *device)
1326 acpi_handle h_dummy;
1327 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1330 if (!dmi_name_in_vendors("IBM"))
1333 /* Look for SMBS object */
1334 result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1338 if (strcmp("SMBS", path.pointer)) {
1343 /* Does it have the necessary (but misnamed) methods? */
1345 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1346 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1347 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1350 kfree(path.pointer);
1354 static void acpi_device_set_id(struct acpi_device *device)
1357 struct acpi_device_info *info;
1358 struct acpi_pnp_device_id_list *cid_list;
1361 switch (device->device_type) {
1362 case ACPI_BUS_TYPE_DEVICE:
1363 if (ACPI_IS_ROOT_DEVICE(device)) {
1364 acpi_add_id(device, ACPI_SYSTEM_HID);
1368 status = acpi_get_object_info(device->handle, &info);
1369 if (ACPI_FAILURE(status)) {
1370 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1374 if (info->valid & ACPI_VALID_HID)
1375 acpi_add_id(device, info->hardware_id.string);
1376 if (info->valid & ACPI_VALID_CID) {
1377 cid_list = &info->compatible_id_list;
1378 for (i = 0; i < cid_list->count; i++)
1379 acpi_add_id(device, cid_list->ids[i].string);
1381 if (info->valid & ACPI_VALID_ADR) {
1382 device->pnp.bus_address = info->address;
1383 device->flags.bus_address = 1;
1385 if (info->valid & ACPI_VALID_UID)
1386 device->pnp.unique_id = kstrdup(info->unique_id.string,
1392 * Some devices don't reliably have _HIDs & _CIDs, so add
1393 * synthetic HIDs to make sure drivers can find them.
1395 if (acpi_is_video_device(device))
1396 acpi_add_id(device, ACPI_VIDEO_HID);
1397 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1398 acpi_add_id(device, ACPI_BAY_HID);
1399 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1400 acpi_add_id(device, ACPI_DOCK_HID);
1401 else if (!acpi_ibm_smbus_match(device))
1402 acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1403 else if (list_empty(&device->pnp.ids) &&
1404 ACPI_IS_ROOT_DEVICE(device->parent)) {
1405 acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1406 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1407 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1411 case ACPI_BUS_TYPE_POWER:
1412 acpi_add_id(device, ACPI_POWER_HID);
1414 case ACPI_BUS_TYPE_PROCESSOR:
1415 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1417 case ACPI_BUS_TYPE_THERMAL:
1418 acpi_add_id(device, ACPI_THERMAL_HID);
1420 case ACPI_BUS_TYPE_POWER_BUTTON:
1421 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1423 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1424 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1429 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1430 int type, unsigned long long sta)
1432 INIT_LIST_HEAD(&device->pnp.ids);
1433 device->device_type = type;
1434 device->handle = handle;
1435 device->parent = acpi_bus_get_parent(handle);
1436 STRUCT_TO_INT(device->status) = sta;
1437 acpi_device_get_busid(device);
1438 acpi_device_set_id(device);
1439 acpi_bus_get_flags(device);
1440 device->flags.match_driver = false;
1441 device_initialize(&device->dev);
1442 dev_set_uevent_suppress(&device->dev, true);
1445 void acpi_device_add_finalize(struct acpi_device *device)
1447 device->flags.match_driver = true;
1448 dev_set_uevent_suppress(&device->dev, false);
1449 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1452 static int acpi_add_single_object(struct acpi_device **child,
1453 acpi_handle handle, int type,
1454 unsigned long long sta)
1457 struct acpi_device *device;
1458 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1460 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1462 printk(KERN_ERR PREFIX "Memory allocation error\n");
1466 acpi_init_device_object(device, handle, type, sta);
1467 acpi_bus_get_power_flags(device);
1468 acpi_bus_get_wakeup_device_flags(device);
1470 result = acpi_device_add(device, acpi_device_release);
1472 acpi_device_release(&device->dev);
1476 acpi_power_add_remove_device(device, true);
1477 acpi_device_add_finalize(device);
1478 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1479 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1480 dev_name(&device->dev), (char *) buffer.pointer,
1481 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1482 kfree(buffer.pointer);
1487 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1488 unsigned long long *sta)
1491 acpi_object_type acpi_type;
1493 status = acpi_get_type(handle, &acpi_type);
1494 if (ACPI_FAILURE(status))
1497 switch (acpi_type) {
1498 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1499 case ACPI_TYPE_DEVICE:
1500 *type = ACPI_BUS_TYPE_DEVICE;
1501 status = acpi_bus_get_status_handle(handle, sta);
1502 if (ACPI_FAILURE(status))
1505 case ACPI_TYPE_PROCESSOR:
1506 *type = ACPI_BUS_TYPE_PROCESSOR;
1507 status = acpi_bus_get_status_handle(handle, sta);
1508 if (ACPI_FAILURE(status))
1511 case ACPI_TYPE_THERMAL:
1512 *type = ACPI_BUS_TYPE_THERMAL;
1513 *sta = ACPI_STA_DEFAULT;
1515 case ACPI_TYPE_POWER:
1516 *type = ACPI_BUS_TYPE_POWER;
1517 *sta = ACPI_STA_DEFAULT;
1526 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1527 void *not_used, void **return_value)
1529 struct acpi_device *device = NULL;
1531 unsigned long long sta;
1535 acpi_bus_get_device(handle, &device);
1539 result = acpi_bus_type_and_status(handle, &type, &sta);
1543 if (type == ACPI_BUS_TYPE_POWER) {
1544 acpi_add_power_resource(handle);
1548 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1549 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1550 struct acpi_device_wakeup wakeup;
1553 status = acpi_get_handle(handle, "_PRW", &temp);
1554 if (ACPI_SUCCESS(status)) {
1555 acpi_bus_extract_wakeup_device_power_package(handle,
1557 acpi_power_resources_list_free(&wakeup.resources);
1559 return AE_CTRL_DEPTH;
1562 acpi_add_single_object(&device, handle, type, sta);
1564 return AE_CTRL_DEPTH;
1568 *return_value = device;
1573 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1574 void *not_used, void **ret_not_used)
1576 acpi_status status = AE_OK;
1577 struct acpi_device *device;
1578 unsigned long long sta_not_used;
1582 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1583 * namespace walks prematurely.
1585 if (acpi_bus_type_and_status(handle, &type_not_used, &sta_not_used))
1588 if (acpi_bus_get_device(handle, &device))
1589 return AE_CTRL_DEPTH;
1591 if (!acpi_match_device_ids(device, acpi_platform_device_ids)) {
1592 /* This is a known good platform device. */
1593 acpi_create_platform_device(device);
1594 } else if (device_attach(&device->dev) < 0) {
1595 status = AE_CTRL_DEPTH;
1601 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1602 * @handle: Root of the namespace scope to scan.
1604 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1607 * If no devices were found, -ENODEV is returned, but it does not mean that
1608 * there has been a real error. There just have been no suitable ACPI objects
1609 * in the table trunk from which the kernel could create a device and add an
1610 * appropriate driver.
1612 int acpi_bus_scan(acpi_handle handle)
1614 void *device = NULL;
1617 mutex_lock(&acpi_scan_lock);
1619 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1620 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1621 acpi_bus_check_add, NULL, NULL, &device);
1625 else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1626 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1627 acpi_bus_device_attach, NULL, NULL, NULL);
1629 mutex_unlock(&acpi_scan_lock);
1632 EXPORT_SYMBOL(acpi_bus_scan);
1634 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1635 void *not_used, void **ret_not_used)
1637 struct acpi_device *device = NULL;
1639 if (!acpi_bus_get_device(handle, &device)) {
1640 device->removal_type = ACPI_BUS_REMOVAL_EJECT;
1641 device_release_driver(&device->dev);
1646 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1647 void *not_used, void **ret_not_used)
1649 struct acpi_device *device = NULL;
1651 if (!acpi_bus_get_device(handle, &device))
1652 acpi_device_unregister(device);
1657 void acpi_bus_trim(struct acpi_device *start)
1659 mutex_lock(&acpi_scan_lock);
1662 * Execute acpi_bus_device_detach() as a post-order callback to detach
1663 * all ACPI drivers from the device nodes being removed.
1665 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1666 acpi_bus_device_detach, NULL, NULL);
1667 acpi_bus_device_detach(start->handle, 0, NULL, NULL);
1669 * Execute acpi_bus_remove() as a post-order callback to remove device
1670 * nodes in the given namespace scope.
1672 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1673 acpi_bus_remove, NULL, NULL);
1674 acpi_bus_remove(start->handle, 0, NULL, NULL);
1676 mutex_unlock(&acpi_scan_lock);
1678 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1680 static int acpi_bus_scan_fixed(void)
1685 * Enumerate all fixed-feature devices.
1687 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
1688 struct acpi_device *device = NULL;
1690 result = acpi_add_single_object(&device, NULL,
1691 ACPI_BUS_TYPE_POWER_BUTTON,
1696 result = device_attach(&device->dev);
1700 device_init_wakeup(&device->dev, true);
1703 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
1704 struct acpi_device *device = NULL;
1706 result = acpi_add_single_object(&device, NULL,
1707 ACPI_BUS_TYPE_SLEEP_BUTTON,
1712 result = device_attach(&device->dev);
1715 return result < 0 ? result : 0;
1718 int __init acpi_scan_init(void)
1722 result = bus_register(&acpi_bus_type);
1724 /* We don't want to quit even if we failed to add suspend/resume */
1725 printk(KERN_ERR PREFIX "Could not register bus type\n");
1728 acpi_pci_root_init();
1731 * Enumerate devices in the ACPI namespace.
1733 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
1737 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
1741 result = acpi_bus_scan_fixed();
1743 acpi_device_unregister(acpi_root);
1747 acpi_update_all_gpes();